diff options
-rw-r--r-- | fs/btrfs/Makefile | 3 | ||||
-rw-r--r-- | fs/btrfs/btrfs_inode.h | 2 | ||||
-rw-r--r-- | fs/btrfs/ctree.h | 15 | ||||
-rw-r--r-- | fs/btrfs/disk-io.c | 123 | ||||
-rw-r--r-- | fs/btrfs/extent-tree.c | 43 | ||||
-rw-r--r-- | fs/btrfs/extent_io.c | 3089 | ||||
-rw-r--r-- | fs/btrfs/extent_io.h | 193 | ||||
-rw-r--r-- | fs/btrfs/extent_map.c | 3119 | ||||
-rw-r--r-- | fs/btrfs/extent_map.h | 214 | ||||
-rw-r--r-- | fs/btrfs/file.c | 29 | ||||
-rw-r--r-- | fs/btrfs/inode.c | 175 | ||||
-rw-r--r-- | fs/btrfs/super.c | 10 | ||||
-rw-r--r-- | fs/btrfs/transaction.c | 8 | ||||
-rw-r--r-- | fs/btrfs/transaction.h | 2 |
14 files changed, 3612 insertions, 3413 deletions
diff --git a/fs/btrfs/Makefile b/fs/btrfs/Makefile index 72cc3e16741f..9c61609f3714 100644 --- a/fs/btrfs/Makefile +++ b/fs/btrfs/Makefile | |||
@@ -5,7 +5,8 @@ obj-m := btrfs.o | |||
5 | btrfs-y := super.o ctree.o extent-tree.o print-tree.o root-tree.o dir-item.o \ | 5 | btrfs-y := super.o ctree.o extent-tree.o print-tree.o root-tree.o dir-item.o \ |
6 | hash.o file-item.o inode-item.o inode-map.o disk-io.o \ | 6 | hash.o file-item.o inode-item.o inode-map.o disk-io.o \ |
7 | transaction.o bit-radix.o inode.o file.o tree-defrag.o \ | 7 | transaction.o bit-radix.o inode.o file.o tree-defrag.o \ |
8 | extent_map.o sysfs.o struct-funcs.o xattr.o ordered-data.o | 8 | extent_map.o sysfs.o struct-funcs.o xattr.o ordered-data.o \ |
9 | extent_io.o | ||
9 | 10 | ||
10 | ifeq ($(CONFIG_FS_POSIX_ACL),y) | 11 | ifeq ($(CONFIG_FS_POSIX_ACL),y) |
11 | btrfs-y += acl.o | 12 | btrfs-y += acl.o |
diff --git a/fs/btrfs/btrfs_inode.h b/fs/btrfs/btrfs_inode.h index 9fc99883c70a..9a0647dc5a0b 100644 --- a/fs/btrfs/btrfs_inode.h +++ b/fs/btrfs/btrfs_inode.h | |||
@@ -20,6 +20,7 @@ | |||
20 | #define __BTRFS_I__ | 20 | #define __BTRFS_I__ |
21 | 21 | ||
22 | #include "extent_map.h" | 22 | #include "extent_map.h" |
23 | #include "extent_io.h" | ||
23 | 24 | ||
24 | /* in memory btrfs inode */ | 25 | /* in memory btrfs inode */ |
25 | struct btrfs_inode { | 26 | struct btrfs_inode { |
@@ -27,6 +28,7 @@ struct btrfs_inode { | |||
27 | struct btrfs_block_group_cache *block_group; | 28 | struct btrfs_block_group_cache *block_group; |
28 | struct btrfs_key location; | 29 | struct btrfs_key location; |
29 | struct extent_map_tree extent_tree; | 30 | struct extent_map_tree extent_tree; |
31 | struct extent_io_tree io_tree; | ||
30 | struct inode vfs_inode; | 32 | struct inode vfs_inode; |
31 | 33 | ||
32 | u64 ordered_trans; | 34 | u64 ordered_trans; |
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h index b9f2975b55c9..6c65473e0fe3 100644 --- a/fs/btrfs/ctree.h +++ b/fs/btrfs/ctree.h | |||
@@ -27,6 +27,7 @@ | |||
27 | #include <linux/completion.h> | 27 | #include <linux/completion.h> |
28 | #include <asm/kmap_types.h> | 28 | #include <asm/kmap_types.h> |
29 | #include "bit-radix.h" | 29 | #include "bit-radix.h" |
30 | #include "extent_io.h" | ||
30 | #include "extent_map.h" | 31 | #include "extent_map.h" |
31 | 32 | ||
32 | struct btrfs_trans_handle; | 33 | struct btrfs_trans_handle; |
@@ -314,11 +315,11 @@ struct btrfs_fs_info { | |||
314 | struct btrfs_root *tree_root; | 315 | struct btrfs_root *tree_root; |
315 | struct radix_tree_root fs_roots_radix; | 316 | struct radix_tree_root fs_roots_radix; |
316 | 317 | ||
317 | struct extent_map_tree free_space_cache; | 318 | struct extent_io_tree free_space_cache; |
318 | struct extent_map_tree block_group_cache; | 319 | struct extent_io_tree block_group_cache; |
319 | struct extent_map_tree pinned_extents; | 320 | struct extent_io_tree pinned_extents; |
320 | struct extent_map_tree pending_del; | 321 | struct extent_io_tree pending_del; |
321 | struct extent_map_tree extent_ins; | 322 | struct extent_io_tree extent_ins; |
322 | 323 | ||
323 | u64 generation; | 324 | u64 generation; |
324 | u64 last_trans_committed; | 325 | u64 last_trans_committed; |
@@ -956,7 +957,7 @@ u32 btrfs_count_snapshots_in_path(struct btrfs_root *root, | |||
956 | u64 first_extent); | 957 | u64 first_extent); |
957 | int btrfs_extent_post_op(struct btrfs_trans_handle *trans, | 958 | int btrfs_extent_post_op(struct btrfs_trans_handle *trans, |
958 | struct btrfs_root *root); | 959 | struct btrfs_root *root); |
959 | int btrfs_copy_pinned(struct btrfs_root *root, struct extent_map_tree *copy); | 960 | int btrfs_copy_pinned(struct btrfs_root *root, struct extent_io_tree *copy); |
960 | struct btrfs_block_group_cache *btrfs_lookup_block_group(struct | 961 | struct btrfs_block_group_cache *btrfs_lookup_block_group(struct |
961 | btrfs_fs_info *info, | 962 | btrfs_fs_info *info, |
962 | u64 bytenr); | 963 | u64 bytenr); |
@@ -1001,7 +1002,7 @@ int btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root | |||
1001 | u64 owner_objectid, u64 owner_offset, int pin); | 1002 | u64 owner_objectid, u64 owner_offset, int pin); |
1002 | int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans, | 1003 | int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans, |
1003 | struct btrfs_root *root, | 1004 | struct btrfs_root *root, |
1004 | struct extent_map_tree *unpin); | 1005 | struct extent_io_tree *unpin); |
1005 | int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans, | 1006 | int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans, |
1006 | struct btrfs_root *root, | 1007 | struct btrfs_root *root, |
1007 | u64 bytenr, u64 num_bytes, | 1008 | u64 bytenr, u64 num_bytes, |
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c index 5d1f9bca2712..4c4ebea0b2a9 100644 --- a/fs/btrfs/disk-io.c +++ b/fs/btrfs/disk-io.c | |||
@@ -43,14 +43,14 @@ static int check_tree_block(struct btrfs_root *root, struct extent_buffer *buf) | |||
43 | } | 43 | } |
44 | #endif | 44 | #endif |
45 | 45 | ||
46 | static struct extent_map_ops btree_extent_map_ops; | 46 | static struct extent_io_ops btree_extent_io_ops; |
47 | 47 | ||
48 | struct extent_buffer *btrfs_find_tree_block(struct btrfs_root *root, | 48 | struct extent_buffer *btrfs_find_tree_block(struct btrfs_root *root, |
49 | u64 bytenr, u32 blocksize) | 49 | u64 bytenr, u32 blocksize) |
50 | { | 50 | { |
51 | struct inode *btree_inode = root->fs_info->btree_inode; | 51 | struct inode *btree_inode = root->fs_info->btree_inode; |
52 | struct extent_buffer *eb; | 52 | struct extent_buffer *eb; |
53 | eb = find_extent_buffer(&BTRFS_I(btree_inode)->extent_tree, | 53 | eb = find_extent_buffer(&BTRFS_I(btree_inode)->io_tree, |
54 | bytenr, blocksize, GFP_NOFS); | 54 | bytenr, blocksize, GFP_NOFS); |
55 | return eb; | 55 | return eb; |
56 | } | 56 | } |
@@ -61,13 +61,13 @@ struct extent_buffer *btrfs_find_create_tree_block(struct btrfs_root *root, | |||
61 | struct inode *btree_inode = root->fs_info->btree_inode; | 61 | struct inode *btree_inode = root->fs_info->btree_inode; |
62 | struct extent_buffer *eb; | 62 | struct extent_buffer *eb; |
63 | 63 | ||
64 | eb = alloc_extent_buffer(&BTRFS_I(btree_inode)->extent_tree, | 64 | eb = alloc_extent_buffer(&BTRFS_I(btree_inode)->io_tree, |
65 | bytenr, blocksize, NULL, GFP_NOFS); | 65 | bytenr, blocksize, NULL, GFP_NOFS); |
66 | return eb; | 66 | return eb; |
67 | } | 67 | } |
68 | 68 | ||
69 | struct extent_map *btree_get_extent(struct inode *inode, struct page *page, | 69 | struct extent_map *btree_get_extent(struct inode *inode, struct page *page, |
70 | size_t page_offset, u64 start, u64 end, | 70 | size_t page_offset, u64 start, u64 len, |
71 | int create) | 71 | int create) |
72 | { | 72 | { |
73 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; | 73 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; |
@@ -75,7 +75,9 @@ struct extent_map *btree_get_extent(struct inode *inode, struct page *page, | |||
75 | int ret; | 75 | int ret; |
76 | 76 | ||
77 | again: | 77 | again: |
78 | em = lookup_extent_mapping(em_tree, start, end); | 78 | spin_lock(&em_tree->lock); |
79 | em = lookup_extent_mapping(em_tree, start, len); | ||
80 | spin_unlock(&em_tree->lock); | ||
79 | if (em) { | 81 | if (em) { |
80 | goto out; | 82 | goto out; |
81 | } | 83 | } |
@@ -85,11 +87,14 @@ again: | |||
85 | goto out; | 87 | goto out; |
86 | } | 88 | } |
87 | em->start = 0; | 89 | em->start = 0; |
88 | em->end = (i_size_read(inode) & ~((u64)PAGE_CACHE_SIZE -1)) - 1; | 90 | em->len = i_size_read(inode); |
89 | em->block_start = 0; | 91 | em->block_start = 0; |
90 | em->block_end = em->end; | ||
91 | em->bdev = inode->i_sb->s_bdev; | 92 | em->bdev = inode->i_sb->s_bdev; |
93 | |||
94 | spin_lock(&em_tree->lock); | ||
92 | ret = add_extent_mapping(em_tree, em); | 95 | ret = add_extent_mapping(em_tree, em); |
96 | spin_unlock(&em_tree->lock); | ||
97 | |||
93 | if (ret == -EEXIST) { | 98 | if (ret == -EEXIST) { |
94 | free_extent_map(em); | 99 | free_extent_map(em); |
95 | em = NULL; | 100 | em = NULL; |
@@ -175,13 +180,13 @@ static int csum_tree_block(struct btrfs_root *root, struct extent_buffer *buf, | |||
175 | 180 | ||
176 | int csum_dirty_buffer(struct btrfs_root *root, struct page *page) | 181 | int csum_dirty_buffer(struct btrfs_root *root, struct page *page) |
177 | { | 182 | { |
178 | struct extent_map_tree *tree; | 183 | struct extent_io_tree *tree; |
179 | u64 start = (u64)page->index << PAGE_CACHE_SHIFT; | 184 | u64 start = (u64)page->index << PAGE_CACHE_SHIFT; |
180 | u64 found_start; | 185 | u64 found_start; |
181 | int found_level; | 186 | int found_level; |
182 | unsigned long len; | 187 | unsigned long len; |
183 | struct extent_buffer *eb; | 188 | struct extent_buffer *eb; |
184 | tree = &BTRFS_I(page->mapping->host)->extent_tree; | 189 | tree = &BTRFS_I(page->mapping->host)->io_tree; |
185 | 190 | ||
186 | if (page->private == EXTENT_PAGE_PRIVATE) | 191 | if (page->private == EXTENT_PAGE_PRIVATE) |
187 | goto out; | 192 | goto out; |
@@ -230,16 +235,16 @@ static int btree_writepage_io_hook(struct page *page, u64 start, u64 end) | |||
230 | 235 | ||
231 | static int btree_writepage(struct page *page, struct writeback_control *wbc) | 236 | static int btree_writepage(struct page *page, struct writeback_control *wbc) |
232 | { | 237 | { |
233 | struct extent_map_tree *tree; | 238 | struct extent_io_tree *tree; |
234 | tree = &BTRFS_I(page->mapping->host)->extent_tree; | 239 | tree = &BTRFS_I(page->mapping->host)->io_tree; |
235 | return extent_write_full_page(tree, page, btree_get_extent, wbc); | 240 | return extent_write_full_page(tree, page, btree_get_extent, wbc); |
236 | } | 241 | } |
237 | 242 | ||
238 | static int btree_writepages(struct address_space *mapping, | 243 | static int btree_writepages(struct address_space *mapping, |
239 | struct writeback_control *wbc) | 244 | struct writeback_control *wbc) |
240 | { | 245 | { |
241 | struct extent_map_tree *tree; | 246 | struct extent_io_tree *tree; |
242 | tree = &BTRFS_I(mapping->host)->extent_tree; | 247 | tree = &BTRFS_I(mapping->host)->io_tree; |
243 | if (wbc->sync_mode == WB_SYNC_NONE) { | 248 | if (wbc->sync_mode == WB_SYNC_NONE) { |
244 | u64 num_dirty; | 249 | u64 num_dirty; |
245 | u64 start = 0; | 250 | u64 start = 0; |
@@ -264,18 +269,20 @@ static int btree_writepages(struct address_space *mapping, | |||
264 | 269 | ||
265 | int btree_readpage(struct file *file, struct page *page) | 270 | int btree_readpage(struct file *file, struct page *page) |
266 | { | 271 | { |
267 | struct extent_map_tree *tree; | 272 | struct extent_io_tree *tree; |
268 | tree = &BTRFS_I(page->mapping->host)->extent_tree; | 273 | tree = &BTRFS_I(page->mapping->host)->io_tree; |
269 | return extent_read_full_page(tree, page, btree_get_extent); | 274 | return extent_read_full_page(tree, page, btree_get_extent); |
270 | } | 275 | } |
271 | 276 | ||
272 | static int btree_releasepage(struct page *page, gfp_t unused_gfp_flags) | 277 | static int btree_releasepage(struct page *page, gfp_t unused_gfp_flags) |
273 | { | 278 | { |
274 | struct extent_map_tree *tree; | 279 | struct extent_io_tree *tree; |
280 | struct extent_map_tree *map; | ||
275 | int ret; | 281 | int ret; |
276 | 282 | ||
277 | tree = &BTRFS_I(page->mapping->host)->extent_tree; | 283 | tree = &BTRFS_I(page->mapping->host)->io_tree; |
278 | ret = try_release_extent_mapping(tree, page); | 284 | map = &BTRFS_I(page->mapping->host)->extent_tree; |
285 | ret = try_release_extent_mapping(map, tree, page); | ||
279 | if (ret == 1) { | 286 | if (ret == 1) { |
280 | ClearPagePrivate(page); | 287 | ClearPagePrivate(page); |
281 | set_page_private(page, 0); | 288 | set_page_private(page, 0); |
@@ -286,8 +293,8 @@ static int btree_releasepage(struct page *page, gfp_t unused_gfp_flags) | |||
286 | 293 | ||
287 | static void btree_invalidatepage(struct page *page, unsigned long offset) | 294 | static void btree_invalidatepage(struct page *page, unsigned long offset) |
288 | { | 295 | { |
289 | struct extent_map_tree *tree; | 296 | struct extent_io_tree *tree; |
290 | tree = &BTRFS_I(page->mapping->host)->extent_tree; | 297 | tree = &BTRFS_I(page->mapping->host)->io_tree; |
291 | extent_invalidatepage(tree, page, offset); | 298 | extent_invalidatepage(tree, page, offset); |
292 | btree_releasepage(page, GFP_NOFS); | 299 | btree_releasepage(page, GFP_NOFS); |
293 | } | 300 | } |
@@ -331,7 +338,7 @@ int readahead_tree_block(struct btrfs_root *root, u64 bytenr, u32 blocksize) | |||
331 | buf = btrfs_find_create_tree_block(root, bytenr, blocksize); | 338 | buf = btrfs_find_create_tree_block(root, bytenr, blocksize); |
332 | if (!buf) | 339 | if (!buf) |
333 | return 0; | 340 | return 0; |
334 | read_extent_buffer_pages(&BTRFS_I(btree_inode)->extent_tree, | 341 | read_extent_buffer_pages(&BTRFS_I(btree_inode)->io_tree, |
335 | buf, 0, 0); | 342 | buf, 0, 0); |
336 | free_extent_buffer(buf); | 343 | free_extent_buffer(buf); |
337 | return ret; | 344 | return ret; |
@@ -342,40 +349,39 @@ struct extent_buffer *read_tree_block(struct btrfs_root *root, u64 bytenr, | |||
342 | { | 349 | { |
343 | struct extent_buffer *buf = NULL; | 350 | struct extent_buffer *buf = NULL; |
344 | struct inode *btree_inode = root->fs_info->btree_inode; | 351 | struct inode *btree_inode = root->fs_info->btree_inode; |
345 | struct extent_map_tree *extent_tree; | 352 | struct extent_io_tree *io_tree; |
346 | u64 end; | 353 | u64 end; |
347 | int ret; | 354 | int ret; |
348 | 355 | ||
349 | extent_tree = &BTRFS_I(btree_inode)->extent_tree; | 356 | io_tree = &BTRFS_I(btree_inode)->io_tree; |
350 | 357 | ||
351 | buf = btrfs_find_create_tree_block(root, bytenr, blocksize); | 358 | buf = btrfs_find_create_tree_block(root, bytenr, blocksize); |
352 | if (!buf) | 359 | if (!buf) |
353 | return NULL; | 360 | return NULL; |
354 | read_extent_buffer_pages(&BTRFS_I(btree_inode)->extent_tree, | 361 | read_extent_buffer_pages(&BTRFS_I(btree_inode)->io_tree, buf, 0, 1); |
355 | buf, 0, 1); | ||
356 | 362 | ||
357 | if (buf->flags & EXTENT_CSUM) | 363 | if (buf->flags & EXTENT_CSUM) |
358 | return buf; | 364 | return buf; |
359 | 365 | ||
360 | end = buf->start + PAGE_CACHE_SIZE - 1; | 366 | end = buf->start + PAGE_CACHE_SIZE - 1; |
361 | if (test_range_bit(extent_tree, buf->start, end, EXTENT_CSUM, 1)) { | 367 | if (test_range_bit(io_tree, buf->start, end, EXTENT_CSUM, 1)) { |
362 | buf->flags |= EXTENT_CSUM; | 368 | buf->flags |= EXTENT_CSUM; |
363 | return buf; | 369 | return buf; |
364 | } | 370 | } |
365 | 371 | ||
366 | lock_extent(extent_tree, buf->start, end, GFP_NOFS); | 372 | lock_extent(io_tree, buf->start, end, GFP_NOFS); |
367 | 373 | ||
368 | if (test_range_bit(extent_tree, buf->start, end, EXTENT_CSUM, 1)) { | 374 | if (test_range_bit(io_tree, buf->start, end, EXTENT_CSUM, 1)) { |
369 | buf->flags |= EXTENT_CSUM; | 375 | buf->flags |= EXTENT_CSUM; |
370 | goto out_unlock; | 376 | goto out_unlock; |
371 | } | 377 | } |
372 | 378 | ||
373 | ret = csum_tree_block(root, buf, 1); | 379 | ret = csum_tree_block(root, buf, 1); |
374 | set_extent_bits(extent_tree, buf->start, end, EXTENT_CSUM, GFP_NOFS); | 380 | set_extent_bits(io_tree, buf->start, end, EXTENT_CSUM, GFP_NOFS); |
375 | buf->flags |= EXTENT_CSUM; | 381 | buf->flags |= EXTENT_CSUM; |
376 | 382 | ||
377 | out_unlock: | 383 | out_unlock: |
378 | unlock_extent(extent_tree, buf->start, end, GFP_NOFS); | 384 | unlock_extent(io_tree, buf->start, end, GFP_NOFS); |
379 | return buf; | 385 | return buf; |
380 | } | 386 | } |
381 | 387 | ||
@@ -385,7 +391,7 @@ int clean_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *root, | |||
385 | struct inode *btree_inode = root->fs_info->btree_inode; | 391 | struct inode *btree_inode = root->fs_info->btree_inode; |
386 | if (btrfs_header_generation(buf) == | 392 | if (btrfs_header_generation(buf) == |
387 | root->fs_info->running_transaction->transid) | 393 | root->fs_info->running_transaction->transid) |
388 | clear_extent_buffer_dirty(&BTRFS_I(btree_inode)->extent_tree, | 394 | clear_extent_buffer_dirty(&BTRFS_I(btree_inode)->io_tree, |
389 | buf); | 395 | buf); |
390 | return 0; | 396 | return 0; |
391 | } | 397 | } |
@@ -394,7 +400,7 @@ int wait_on_tree_block_writeback(struct btrfs_root *root, | |||
394 | struct extent_buffer *buf) | 400 | struct extent_buffer *buf) |
395 | { | 401 | { |
396 | struct inode *btree_inode = root->fs_info->btree_inode; | 402 | struct inode *btree_inode = root->fs_info->btree_inode; |
397 | wait_on_extent_buffer_writeback(&BTRFS_I(btree_inode)->extent_tree, | 403 | wait_on_extent_buffer_writeback(&BTRFS_I(btree_inode)->io_tree, |
398 | buf); | 404 | buf); |
399 | return 0; | 405 | return 0; |
400 | } | 406 | } |
@@ -659,20 +665,23 @@ struct btrfs_root *open_ctree(struct super_block *sb) | |||
659 | fs_info->btree_inode->i_nlink = 1; | 665 | fs_info->btree_inode->i_nlink = 1; |
660 | fs_info->btree_inode->i_size = sb->s_bdev->bd_inode->i_size; | 666 | fs_info->btree_inode->i_size = sb->s_bdev->bd_inode->i_size; |
661 | fs_info->btree_inode->i_mapping->a_ops = &btree_aops; | 667 | fs_info->btree_inode->i_mapping->a_ops = &btree_aops; |
662 | extent_map_tree_init(&BTRFS_I(fs_info->btree_inode)->extent_tree, | 668 | extent_io_tree_init(&BTRFS_I(fs_info->btree_inode)->io_tree, |
663 | fs_info->btree_inode->i_mapping, | 669 | fs_info->btree_inode->i_mapping, |
664 | GFP_NOFS); | 670 | GFP_NOFS); |
665 | BTRFS_I(fs_info->btree_inode)->extent_tree.ops = &btree_extent_map_ops; | 671 | extent_map_tree_init(&BTRFS_I(fs_info->btree_inode)->extent_tree, |
672 | GFP_NOFS); | ||
673 | |||
674 | BTRFS_I(fs_info->btree_inode)->io_tree.ops = &btree_extent_io_ops; | ||
666 | 675 | ||
667 | extent_map_tree_init(&fs_info->free_space_cache, | 676 | extent_io_tree_init(&fs_info->free_space_cache, |
668 | fs_info->btree_inode->i_mapping, GFP_NOFS); | 677 | fs_info->btree_inode->i_mapping, GFP_NOFS); |
669 | extent_map_tree_init(&fs_info->block_group_cache, | 678 | extent_io_tree_init(&fs_info->block_group_cache, |
670 | fs_info->btree_inode->i_mapping, GFP_NOFS); | 679 | fs_info->btree_inode->i_mapping, GFP_NOFS); |
671 | extent_map_tree_init(&fs_info->pinned_extents, | 680 | extent_io_tree_init(&fs_info->pinned_extents, |
672 | fs_info->btree_inode->i_mapping, GFP_NOFS); | 681 | fs_info->btree_inode->i_mapping, GFP_NOFS); |
673 | extent_map_tree_init(&fs_info->pending_del, | 682 | extent_io_tree_init(&fs_info->pending_del, |
674 | fs_info->btree_inode->i_mapping, GFP_NOFS); | 683 | fs_info->btree_inode->i_mapping, GFP_NOFS); |
675 | extent_map_tree_init(&fs_info->extent_ins, | 684 | extent_io_tree_init(&fs_info->extent_ins, |
676 | fs_info->btree_inode->i_mapping, GFP_NOFS); | 685 | fs_info->btree_inode->i_mapping, GFP_NOFS); |
677 | fs_info->do_barriers = 1; | 686 | fs_info->do_barriers = 1; |
678 | fs_info->closing = 0; | 687 | fs_info->closing = 0; |
@@ -787,7 +796,7 @@ int write_ctree_super(struct btrfs_trans_handle *trans, struct btrfs_root | |||
787 | 796 | ||
788 | if (!btrfs_test_opt(root, NOBARRIER)) | 797 | if (!btrfs_test_opt(root, NOBARRIER)) |
789 | blkdev_issue_flush(sb->s_bdev, NULL); | 798 | blkdev_issue_flush(sb->s_bdev, NULL); |
790 | set_extent_buffer_dirty(&BTRFS_I(btree_inode)->extent_tree, super); | 799 | set_extent_buffer_dirty(&BTRFS_I(btree_inode)->io_tree, super); |
791 | ret = sync_page_range_nolock(btree_inode, btree_inode->i_mapping, | 800 | ret = sync_page_range_nolock(btree_inode, btree_inode->i_mapping, |
792 | super->start, super->len); | 801 | super->start, super->len); |
793 | if (!btrfs_test_opt(root, NOBARRIER)) | 802 | if (!btrfs_test_opt(root, NOBARRIER)) |
@@ -864,12 +873,12 @@ int close_ctree(struct btrfs_root *root) | |||
864 | 873 | ||
865 | filemap_write_and_wait(fs_info->btree_inode->i_mapping); | 874 | filemap_write_and_wait(fs_info->btree_inode->i_mapping); |
866 | 875 | ||
867 | extent_map_tree_empty_lru(&fs_info->free_space_cache); | 876 | extent_io_tree_empty_lru(&fs_info->free_space_cache); |
868 | extent_map_tree_empty_lru(&fs_info->block_group_cache); | 877 | extent_io_tree_empty_lru(&fs_info->block_group_cache); |
869 | extent_map_tree_empty_lru(&fs_info->pinned_extents); | 878 | extent_io_tree_empty_lru(&fs_info->pinned_extents); |
870 | extent_map_tree_empty_lru(&fs_info->pending_del); | 879 | extent_io_tree_empty_lru(&fs_info->pending_del); |
871 | extent_map_tree_empty_lru(&fs_info->extent_ins); | 880 | extent_io_tree_empty_lru(&fs_info->extent_ins); |
872 | extent_map_tree_empty_lru(&BTRFS_I(fs_info->btree_inode)->extent_tree); | 881 | extent_io_tree_empty_lru(&BTRFS_I(fs_info->btree_inode)->io_tree); |
873 | 882 | ||
874 | truncate_inode_pages(fs_info->btree_inode->i_mapping, 0); | 883 | truncate_inode_pages(fs_info->btree_inode->i_mapping, 0); |
875 | 884 | ||
@@ -892,13 +901,13 @@ int close_ctree(struct btrfs_root *root) | |||
892 | int btrfs_buffer_uptodate(struct extent_buffer *buf) | 901 | int btrfs_buffer_uptodate(struct extent_buffer *buf) |
893 | { | 902 | { |
894 | struct inode *btree_inode = buf->first_page->mapping->host; | 903 | struct inode *btree_inode = buf->first_page->mapping->host; |
895 | return extent_buffer_uptodate(&BTRFS_I(btree_inode)->extent_tree, buf); | 904 | return extent_buffer_uptodate(&BTRFS_I(btree_inode)->io_tree, buf); |
896 | } | 905 | } |
897 | 906 | ||
898 | int btrfs_set_buffer_uptodate(struct extent_buffer *buf) | 907 | int btrfs_set_buffer_uptodate(struct extent_buffer *buf) |
899 | { | 908 | { |
900 | struct inode *btree_inode = buf->first_page->mapping->host; | 909 | struct inode *btree_inode = buf->first_page->mapping->host; |
901 | return set_extent_buffer_uptodate(&BTRFS_I(btree_inode)->extent_tree, | 910 | return set_extent_buffer_uptodate(&BTRFS_I(btree_inode)->io_tree, |
902 | buf); | 911 | buf); |
903 | } | 912 | } |
904 | 913 | ||
@@ -914,7 +923,7 @@ void btrfs_mark_buffer_dirty(struct extent_buffer *buf) | |||
914 | transid, root->fs_info->generation); | 923 | transid, root->fs_info->generation); |
915 | WARN_ON(1); | 924 | WARN_ON(1); |
916 | } | 925 | } |
917 | set_extent_buffer_dirty(&BTRFS_I(btree_inode)->extent_tree, buf); | 926 | set_extent_buffer_dirty(&BTRFS_I(btree_inode)->io_tree, buf); |
918 | } | 927 | } |
919 | 928 | ||
920 | void btrfs_throttle(struct btrfs_root *root) | 929 | void btrfs_throttle(struct btrfs_root *root) |
@@ -941,7 +950,7 @@ void btrfs_set_buffer_defrag(struct extent_buffer *buf) | |||
941 | { | 950 | { |
942 | struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root; | 951 | struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root; |
943 | struct inode *btree_inode = root->fs_info->btree_inode; | 952 | struct inode *btree_inode = root->fs_info->btree_inode; |
944 | set_extent_bits(&BTRFS_I(btree_inode)->extent_tree, buf->start, | 953 | set_extent_bits(&BTRFS_I(btree_inode)->io_tree, buf->start, |
945 | buf->start + buf->len - 1, EXTENT_DEFRAG, GFP_NOFS); | 954 | buf->start + buf->len - 1, EXTENT_DEFRAG, GFP_NOFS); |
946 | } | 955 | } |
947 | 956 | ||
@@ -949,7 +958,7 @@ void btrfs_set_buffer_defrag_done(struct extent_buffer *buf) | |||
949 | { | 958 | { |
950 | struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root; | 959 | struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root; |
951 | struct inode *btree_inode = root->fs_info->btree_inode; | 960 | struct inode *btree_inode = root->fs_info->btree_inode; |
952 | set_extent_bits(&BTRFS_I(btree_inode)->extent_tree, buf->start, | 961 | set_extent_bits(&BTRFS_I(btree_inode)->io_tree, buf->start, |
953 | buf->start + buf->len - 1, EXTENT_DEFRAG_DONE, | 962 | buf->start + buf->len - 1, EXTENT_DEFRAG_DONE, |
954 | GFP_NOFS); | 963 | GFP_NOFS); |
955 | } | 964 | } |
@@ -958,7 +967,7 @@ int btrfs_buffer_defrag(struct extent_buffer *buf) | |||
958 | { | 967 | { |
959 | struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root; | 968 | struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root; |
960 | struct inode *btree_inode = root->fs_info->btree_inode; | 969 | struct inode *btree_inode = root->fs_info->btree_inode; |
961 | return test_range_bit(&BTRFS_I(btree_inode)->extent_tree, | 970 | return test_range_bit(&BTRFS_I(btree_inode)->io_tree, |
962 | buf->start, buf->start + buf->len - 1, EXTENT_DEFRAG, 0); | 971 | buf->start, buf->start + buf->len - 1, EXTENT_DEFRAG, 0); |
963 | } | 972 | } |
964 | 973 | ||
@@ -966,7 +975,7 @@ int btrfs_buffer_defrag_done(struct extent_buffer *buf) | |||
966 | { | 975 | { |
967 | struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root; | 976 | struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root; |
968 | struct inode *btree_inode = root->fs_info->btree_inode; | 977 | struct inode *btree_inode = root->fs_info->btree_inode; |
969 | return test_range_bit(&BTRFS_I(btree_inode)->extent_tree, | 978 | return test_range_bit(&BTRFS_I(btree_inode)->io_tree, |
970 | buf->start, buf->start + buf->len - 1, | 979 | buf->start, buf->start + buf->len - 1, |
971 | EXTENT_DEFRAG_DONE, 0); | 980 | EXTENT_DEFRAG_DONE, 0); |
972 | } | 981 | } |
@@ -975,7 +984,7 @@ int btrfs_clear_buffer_defrag_done(struct extent_buffer *buf) | |||
975 | { | 984 | { |
976 | struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root; | 985 | struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root; |
977 | struct inode *btree_inode = root->fs_info->btree_inode; | 986 | struct inode *btree_inode = root->fs_info->btree_inode; |
978 | return clear_extent_bits(&BTRFS_I(btree_inode)->extent_tree, | 987 | return clear_extent_bits(&BTRFS_I(btree_inode)->io_tree, |
979 | buf->start, buf->start + buf->len - 1, | 988 | buf->start, buf->start + buf->len - 1, |
980 | EXTENT_DEFRAG_DONE, GFP_NOFS); | 989 | EXTENT_DEFRAG_DONE, GFP_NOFS); |
981 | } | 990 | } |
@@ -984,7 +993,7 @@ int btrfs_clear_buffer_defrag(struct extent_buffer *buf) | |||
984 | { | 993 | { |
985 | struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root; | 994 | struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root; |
986 | struct inode *btree_inode = root->fs_info->btree_inode; | 995 | struct inode *btree_inode = root->fs_info->btree_inode; |
987 | return clear_extent_bits(&BTRFS_I(btree_inode)->extent_tree, | 996 | return clear_extent_bits(&BTRFS_I(btree_inode)->io_tree, |
988 | buf->start, buf->start + buf->len - 1, | 997 | buf->start, buf->start + buf->len - 1, |
989 | EXTENT_DEFRAG, GFP_NOFS); | 998 | EXTENT_DEFRAG, GFP_NOFS); |
990 | } | 999 | } |
@@ -993,10 +1002,10 @@ int btrfs_read_buffer(struct extent_buffer *buf) | |||
993 | { | 1002 | { |
994 | struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root; | 1003 | struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root; |
995 | struct inode *btree_inode = root->fs_info->btree_inode; | 1004 | struct inode *btree_inode = root->fs_info->btree_inode; |
996 | return read_extent_buffer_pages(&BTRFS_I(btree_inode)->extent_tree, | 1005 | return read_extent_buffer_pages(&BTRFS_I(btree_inode)->io_tree, |
997 | buf, 0, 1); | 1006 | buf, 0, 1); |
998 | } | 1007 | } |
999 | 1008 | ||
1000 | static struct extent_map_ops btree_extent_map_ops = { | 1009 | static struct extent_io_ops btree_extent_io_ops = { |
1001 | .writepage_io_hook = btree_writepage_io_hook, | 1010 | .writepage_io_hook = btree_writepage_io_hook, |
1002 | }; | 1011 | }; |
diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c index b69a46691a96..1cf125ab7822 100644 --- a/fs/btrfs/extent-tree.c +++ b/fs/btrfs/extent-tree.c | |||
@@ -63,7 +63,7 @@ static int cache_block_group(struct btrfs_root *root, | |||
63 | int ret; | 63 | int ret; |
64 | struct btrfs_key key; | 64 | struct btrfs_key key; |
65 | struct extent_buffer *leaf; | 65 | struct extent_buffer *leaf; |
66 | struct extent_map_tree *free_space_cache; | 66 | struct extent_io_tree *free_space_cache; |
67 | int slot; | 67 | int slot; |
68 | u64 last = 0; | 68 | u64 last = 0; |
69 | u64 hole_size; | 69 | u64 hole_size; |
@@ -158,7 +158,7 @@ struct btrfs_block_group_cache *btrfs_lookup_block_group(struct | |||
158 | btrfs_fs_info *info, | 158 | btrfs_fs_info *info, |
159 | u64 bytenr) | 159 | u64 bytenr) |
160 | { | 160 | { |
161 | struct extent_map_tree *block_group_cache; | 161 | struct extent_io_tree *block_group_cache; |
162 | struct btrfs_block_group_cache *block_group = NULL; | 162 | struct btrfs_block_group_cache *block_group = NULL; |
163 | u64 ptr; | 163 | u64 ptr; |
164 | u64 start; | 164 | u64 start; |
@@ -281,7 +281,7 @@ struct btrfs_block_group_cache *btrfs_find_block_group(struct btrfs_root *root, | |||
281 | int data, int owner) | 281 | int data, int owner) |
282 | { | 282 | { |
283 | struct btrfs_block_group_cache *cache; | 283 | struct btrfs_block_group_cache *cache; |
284 | struct extent_map_tree *block_group_cache; | 284 | struct extent_io_tree *block_group_cache; |
285 | struct btrfs_block_group_cache *found_group = NULL; | 285 | struct btrfs_block_group_cache *found_group = NULL; |
286 | struct btrfs_fs_info *info = root->fs_info; | 286 | struct btrfs_fs_info *info = root->fs_info; |
287 | u64 used; | 287 | u64 used; |
@@ -951,7 +951,7 @@ fail: | |||
951 | int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans, | 951 | int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans, |
952 | struct btrfs_root *root) | 952 | struct btrfs_root *root) |
953 | { | 953 | { |
954 | struct extent_map_tree *block_group_cache; | 954 | struct extent_io_tree *block_group_cache; |
955 | struct btrfs_block_group_cache *cache; | 955 | struct btrfs_block_group_cache *cache; |
956 | int ret; | 956 | int ret; |
957 | int err = 0; | 957 | int err = 0; |
@@ -1107,12 +1107,12 @@ static int update_pinned_extents(struct btrfs_root *root, | |||
1107 | return 0; | 1107 | return 0; |
1108 | } | 1108 | } |
1109 | 1109 | ||
1110 | int btrfs_copy_pinned(struct btrfs_root *root, struct extent_map_tree *copy) | 1110 | int btrfs_copy_pinned(struct btrfs_root *root, struct extent_io_tree *copy) |
1111 | { | 1111 | { |
1112 | u64 last = 0; | 1112 | u64 last = 0; |
1113 | u64 start; | 1113 | u64 start; |
1114 | u64 end; | 1114 | u64 end; |
1115 | struct extent_map_tree *pinned_extents = &root->fs_info->pinned_extents; | 1115 | struct extent_io_tree *pinned_extents = &root->fs_info->pinned_extents; |
1116 | int ret; | 1116 | int ret; |
1117 | 1117 | ||
1118 | while(1) { | 1118 | while(1) { |
@@ -1128,12 +1128,12 @@ int btrfs_copy_pinned(struct btrfs_root *root, struct extent_map_tree *copy) | |||
1128 | 1128 | ||
1129 | int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans, | 1129 | int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans, |
1130 | struct btrfs_root *root, | 1130 | struct btrfs_root *root, |
1131 | struct extent_map_tree *unpin) | 1131 | struct extent_io_tree *unpin) |
1132 | { | 1132 | { |
1133 | u64 start; | 1133 | u64 start; |
1134 | u64 end; | 1134 | u64 end; |
1135 | int ret; | 1135 | int ret; |
1136 | struct extent_map_tree *free_space_cache; | 1136 | struct extent_io_tree *free_space_cache; |
1137 | free_space_cache = &root->fs_info->free_space_cache; | 1137 | free_space_cache = &root->fs_info->free_space_cache; |
1138 | 1138 | ||
1139 | while(1) { | 1139 | while(1) { |
@@ -1329,8 +1329,8 @@ static int del_pending_extents(struct btrfs_trans_handle *trans, struct | |||
1329 | int err = 0; | 1329 | int err = 0; |
1330 | u64 start; | 1330 | u64 start; |
1331 | u64 end; | 1331 | u64 end; |
1332 | struct extent_map_tree *pending_del; | 1332 | struct extent_io_tree *pending_del; |
1333 | struct extent_map_tree *pinned_extents; | 1333 | struct extent_io_tree *pinned_extents; |
1334 | 1334 | ||
1335 | pending_del = &extent_root->fs_info->pending_del; | 1335 | pending_del = &extent_root->fs_info->pending_del; |
1336 | pinned_extents = &extent_root->fs_info->pinned_extents; | 1336 | pinned_extents = &extent_root->fs_info->pinned_extents; |
@@ -1802,7 +1802,7 @@ struct extent_buffer *__btrfs_alloc_free_block(struct btrfs_trans_handle *trans, | |||
1802 | 1802 | ||
1803 | set_extent_dirty(&trans->transaction->dirty_pages, buf->start, | 1803 | set_extent_dirty(&trans->transaction->dirty_pages, buf->start, |
1804 | buf->start + buf->len - 1, GFP_NOFS); | 1804 | buf->start + buf->len - 1, GFP_NOFS); |
1805 | set_extent_bits(&BTRFS_I(root->fs_info->btree_inode)->extent_tree, | 1805 | set_extent_bits(&BTRFS_I(root->fs_info->btree_inode)->io_tree, |
1806 | buf->start, buf->start + buf->len - 1, | 1806 | buf->start, buf->start + buf->len - 1, |
1807 | EXTENT_CSUM, GFP_NOFS); | 1807 | EXTENT_CSUM, GFP_NOFS); |
1808 | buf->flags |= EXTENT_CSUM; | 1808 | buf->flags |= EXTENT_CSUM; |
@@ -2166,7 +2166,7 @@ static int noinline relocate_inode_pages(struct inode *inode, u64 start, | |||
2166 | unsigned long i; | 2166 | unsigned long i; |
2167 | struct page *page; | 2167 | struct page *page; |
2168 | struct btrfs_root *root = BTRFS_I(inode)->root; | 2168 | struct btrfs_root *root = BTRFS_I(inode)->root; |
2169 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; | 2169 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
2170 | struct file_ra_state *ra; | 2170 | struct file_ra_state *ra; |
2171 | 2171 | ||
2172 | ra = kzalloc(sizeof(*ra), GFP_NOFS); | 2172 | ra = kzalloc(sizeof(*ra), GFP_NOFS); |
@@ -2195,15 +2195,14 @@ static int noinline relocate_inode_pages(struct inode *inode, u64 start, | |||
2195 | page_start = (u64)page->index << PAGE_CACHE_SHIFT; | 2195 | page_start = (u64)page->index << PAGE_CACHE_SHIFT; |
2196 | page_end = page_start + PAGE_CACHE_SIZE - 1; | 2196 | page_end = page_start + PAGE_CACHE_SIZE - 1; |
2197 | 2197 | ||
2198 | lock_extent(em_tree, page_start, page_end, GFP_NOFS); | 2198 | lock_extent(io_tree, page_start, page_end, GFP_NOFS); |
2199 | 2199 | ||
2200 | delalloc_start = page_start; | 2200 | delalloc_start = page_start; |
2201 | existing_delalloc = | 2201 | existing_delalloc = count_range_bits(io_tree, |
2202 | count_range_bits(&BTRFS_I(inode)->extent_tree, | 2202 | &delalloc_start, page_end, |
2203 | &delalloc_start, page_end, | 2203 | PAGE_CACHE_SIZE, EXTENT_DELALLOC); |
2204 | PAGE_CACHE_SIZE, EXTENT_DELALLOC); | ||
2205 | 2204 | ||
2206 | set_extent_delalloc(em_tree, page_start, | 2205 | set_extent_delalloc(io_tree, page_start, |
2207 | page_end, GFP_NOFS); | 2206 | page_end, GFP_NOFS); |
2208 | 2207 | ||
2209 | spin_lock(&root->fs_info->delalloc_lock); | 2208 | spin_lock(&root->fs_info->delalloc_lock); |
@@ -2211,7 +2210,7 @@ static int noinline relocate_inode_pages(struct inode *inode, u64 start, | |||
2211 | existing_delalloc; | 2210 | existing_delalloc; |
2212 | spin_unlock(&root->fs_info->delalloc_lock); | 2211 | spin_unlock(&root->fs_info->delalloc_lock); |
2213 | 2212 | ||
2214 | unlock_extent(em_tree, page_start, page_end, GFP_NOFS); | 2213 | unlock_extent(io_tree, page_start, page_end, GFP_NOFS); |
2215 | set_page_dirty(page); | 2214 | set_page_dirty(page); |
2216 | unlock_page(page); | 2215 | unlock_page(page); |
2217 | page_cache_release(page); | 2216 | page_cache_release(page); |
@@ -2379,7 +2378,7 @@ int btrfs_shrink_extent_tree(struct btrfs_root *root, u64 new_size) | |||
2379 | u64 cur_byte; | 2378 | u64 cur_byte; |
2380 | u64 total_found; | 2379 | u64 total_found; |
2381 | struct btrfs_fs_info *info = root->fs_info; | 2380 | struct btrfs_fs_info *info = root->fs_info; |
2382 | struct extent_map_tree *block_group_cache; | 2381 | struct extent_io_tree *block_group_cache; |
2383 | struct btrfs_key key; | 2382 | struct btrfs_key key; |
2384 | struct btrfs_key found_key; | 2383 | struct btrfs_key found_key; |
2385 | struct extent_buffer *leaf; | 2384 | struct extent_buffer *leaf; |
@@ -2561,7 +2560,7 @@ int btrfs_grow_extent_tree(struct btrfs_trans_handle *trans, | |||
2561 | struct btrfs_block_group_cache *cache; | 2560 | struct btrfs_block_group_cache *cache; |
2562 | struct btrfs_block_group_item *item; | 2561 | struct btrfs_block_group_item *item; |
2563 | struct btrfs_fs_info *info = root->fs_info; | 2562 | struct btrfs_fs_info *info = root->fs_info; |
2564 | struct extent_map_tree *block_group_cache; | 2563 | struct extent_io_tree *block_group_cache; |
2565 | struct btrfs_key key; | 2564 | struct btrfs_key key; |
2566 | struct extent_buffer *leaf; | 2565 | struct extent_buffer *leaf; |
2567 | int ret; | 2566 | int ret; |
@@ -2645,7 +2644,7 @@ int btrfs_read_block_groups(struct btrfs_root *root) | |||
2645 | int bit; | 2644 | int bit; |
2646 | struct btrfs_block_group_cache *cache; | 2645 | struct btrfs_block_group_cache *cache; |
2647 | struct btrfs_fs_info *info = root->fs_info; | 2646 | struct btrfs_fs_info *info = root->fs_info; |
2648 | struct extent_map_tree *block_group_cache; | 2647 | struct extent_io_tree *block_group_cache; |
2649 | struct btrfs_key key; | 2648 | struct btrfs_key key; |
2650 | struct btrfs_key found_key; | 2649 | struct btrfs_key found_key; |
2651 | struct extent_buffer *leaf; | 2650 | struct extent_buffer *leaf; |
diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c new file mode 100644 index 000000000000..15cc158a0498 --- /dev/null +++ b/fs/btrfs/extent_io.c | |||
@@ -0,0 +1,3089 @@ | |||
1 | #include <linux/bitops.h> | ||
2 | #include <linux/slab.h> | ||
3 | #include <linux/bio.h> | ||
4 | #include <linux/mm.h> | ||
5 | #include <linux/gfp.h> | ||
6 | #include <linux/pagemap.h> | ||
7 | #include <linux/page-flags.h> | ||
8 | #include <linux/module.h> | ||
9 | #include <linux/spinlock.h> | ||
10 | #include <linux/blkdev.h> | ||
11 | #include <linux/swap.h> | ||
12 | #include <linux/version.h> | ||
13 | #include <linux/writeback.h> | ||
14 | #include <linux/pagevec.h> | ||
15 | #include "extent_io.h" | ||
16 | #include "extent_map.h" | ||
17 | |||
18 | /* temporary define until extent_map moves out of btrfs */ | ||
19 | struct kmem_cache *btrfs_cache_create(const char *name, size_t size, | ||
20 | unsigned long extra_flags, | ||
21 | void (*ctor)(void *, struct kmem_cache *, | ||
22 | unsigned long)); | ||
23 | |||
24 | static struct kmem_cache *extent_state_cache; | ||
25 | static struct kmem_cache *extent_buffer_cache; | ||
26 | |||
27 | static LIST_HEAD(buffers); | ||
28 | static LIST_HEAD(states); | ||
29 | |||
30 | static spinlock_t state_lock = SPIN_LOCK_UNLOCKED; | ||
31 | #define BUFFER_LRU_MAX 64 | ||
32 | |||
33 | struct tree_entry { | ||
34 | u64 start; | ||
35 | u64 end; | ||
36 | int in_tree; | ||
37 | struct rb_node rb_node; | ||
38 | }; | ||
39 | |||
40 | struct extent_page_data { | ||
41 | struct bio *bio; | ||
42 | struct extent_io_tree *tree; | ||
43 | get_extent_t *get_extent; | ||
44 | }; | ||
45 | |||
46 | int __init extent_io_init(void) | ||
47 | { | ||
48 | extent_state_cache = btrfs_cache_create("extent_state", | ||
49 | sizeof(struct extent_state), 0, | ||
50 | NULL); | ||
51 | if (!extent_state_cache) | ||
52 | return -ENOMEM; | ||
53 | |||
54 | extent_buffer_cache = btrfs_cache_create("extent_buffers", | ||
55 | sizeof(struct extent_buffer), 0, | ||
56 | NULL); | ||
57 | if (!extent_buffer_cache) | ||
58 | goto free_state_cache; | ||
59 | return 0; | ||
60 | |||
61 | free_state_cache: | ||
62 | kmem_cache_destroy(extent_state_cache); | ||
63 | return -ENOMEM; | ||
64 | } | ||
65 | |||
66 | void extent_io_exit(void) | ||
67 | { | ||
68 | struct extent_state *state; | ||
69 | |||
70 | while (!list_empty(&states)) { | ||
71 | state = list_entry(states.next, struct extent_state, list); | ||
72 | printk("state leak: start %Lu end %Lu state %lu in tree %d refs %d\n", state->start, state->end, state->state, state->in_tree, atomic_read(&state->refs)); | ||
73 | list_del(&state->list); | ||
74 | kmem_cache_free(extent_state_cache, state); | ||
75 | |||
76 | } | ||
77 | |||
78 | if (extent_state_cache) | ||
79 | kmem_cache_destroy(extent_state_cache); | ||
80 | if (extent_buffer_cache) | ||
81 | kmem_cache_destroy(extent_buffer_cache); | ||
82 | } | ||
83 | |||
84 | void extent_io_tree_init(struct extent_io_tree *tree, | ||
85 | struct address_space *mapping, gfp_t mask) | ||
86 | { | ||
87 | tree->state.rb_node = NULL; | ||
88 | tree->ops = NULL; | ||
89 | tree->dirty_bytes = 0; | ||
90 | rwlock_init(&tree->lock); | ||
91 | spin_lock_init(&tree->lru_lock); | ||
92 | tree->mapping = mapping; | ||
93 | INIT_LIST_HEAD(&tree->buffer_lru); | ||
94 | tree->lru_size = 0; | ||
95 | } | ||
96 | EXPORT_SYMBOL(extent_io_tree_init); | ||
97 | |||
98 | void extent_io_tree_empty_lru(struct extent_io_tree *tree) | ||
99 | { | ||
100 | struct extent_buffer *eb; | ||
101 | while(!list_empty(&tree->buffer_lru)) { | ||
102 | eb = list_entry(tree->buffer_lru.next, struct extent_buffer, | ||
103 | lru); | ||
104 | list_del_init(&eb->lru); | ||
105 | free_extent_buffer(eb); | ||
106 | } | ||
107 | } | ||
108 | EXPORT_SYMBOL(extent_io_tree_empty_lru); | ||
109 | |||
110 | struct extent_state *alloc_extent_state(gfp_t mask) | ||
111 | { | ||
112 | struct extent_state *state; | ||
113 | unsigned long flags; | ||
114 | |||
115 | state = kmem_cache_alloc(extent_state_cache, mask); | ||
116 | if (!state || IS_ERR(state)) | ||
117 | return state; | ||
118 | state->state = 0; | ||
119 | state->in_tree = 0; | ||
120 | state->private = 0; | ||
121 | |||
122 | spin_lock_irqsave(&state_lock, flags); | ||
123 | list_add(&state->list, &states); | ||
124 | spin_unlock_irqrestore(&state_lock, flags); | ||
125 | |||
126 | atomic_set(&state->refs, 1); | ||
127 | init_waitqueue_head(&state->wq); | ||
128 | return state; | ||
129 | } | ||
130 | EXPORT_SYMBOL(alloc_extent_state); | ||
131 | |||
132 | void free_extent_state(struct extent_state *state) | ||
133 | { | ||
134 | unsigned long flags; | ||
135 | if (!state) | ||
136 | return; | ||
137 | if (atomic_dec_and_test(&state->refs)) { | ||
138 | WARN_ON(state->in_tree); | ||
139 | spin_lock_irqsave(&state_lock, flags); | ||
140 | list_del(&state->list); | ||
141 | spin_unlock_irqrestore(&state_lock, flags); | ||
142 | kmem_cache_free(extent_state_cache, state); | ||
143 | } | ||
144 | } | ||
145 | EXPORT_SYMBOL(free_extent_state); | ||
146 | |||
147 | static struct rb_node *tree_insert(struct rb_root *root, u64 offset, | ||
148 | struct rb_node *node) | ||
149 | { | ||
150 | struct rb_node ** p = &root->rb_node; | ||
151 | struct rb_node * parent = NULL; | ||
152 | struct tree_entry *entry; | ||
153 | |||
154 | while(*p) { | ||
155 | parent = *p; | ||
156 | entry = rb_entry(parent, struct tree_entry, rb_node); | ||
157 | |||
158 | if (offset < entry->start) | ||
159 | p = &(*p)->rb_left; | ||
160 | else if (offset > entry->end) | ||
161 | p = &(*p)->rb_right; | ||
162 | else | ||
163 | return parent; | ||
164 | } | ||
165 | |||
166 | entry = rb_entry(node, struct tree_entry, rb_node); | ||
167 | entry->in_tree = 1; | ||
168 | rb_link_node(node, parent, p); | ||
169 | rb_insert_color(node, root); | ||
170 | return NULL; | ||
171 | } | ||
172 | |||
173 | static struct rb_node *__tree_search(struct rb_root *root, u64 offset, | ||
174 | struct rb_node **prev_ret, | ||
175 | struct rb_node **next_ret) | ||
176 | { | ||
177 | struct rb_node * n = root->rb_node; | ||
178 | struct rb_node *prev = NULL; | ||
179 | struct rb_node *orig_prev = NULL; | ||
180 | struct tree_entry *entry; | ||
181 | struct tree_entry *prev_entry = NULL; | ||
182 | |||
183 | while(n) { | ||
184 | entry = rb_entry(n, struct tree_entry, rb_node); | ||
185 | prev = n; | ||
186 | prev_entry = entry; | ||
187 | |||
188 | if (offset < entry->start) | ||
189 | n = n->rb_left; | ||
190 | else if (offset > entry->end) | ||
191 | n = n->rb_right; | ||
192 | else | ||
193 | return n; | ||
194 | } | ||
195 | |||
196 | if (prev_ret) { | ||
197 | orig_prev = prev; | ||
198 | while(prev && offset > prev_entry->end) { | ||
199 | prev = rb_next(prev); | ||
200 | prev_entry = rb_entry(prev, struct tree_entry, rb_node); | ||
201 | } | ||
202 | *prev_ret = prev; | ||
203 | prev = orig_prev; | ||
204 | } | ||
205 | |||
206 | if (next_ret) { | ||
207 | prev_entry = rb_entry(prev, struct tree_entry, rb_node); | ||
208 | while(prev && offset < prev_entry->start) { | ||
209 | prev = rb_prev(prev); | ||
210 | prev_entry = rb_entry(prev, struct tree_entry, rb_node); | ||
211 | } | ||
212 | *next_ret = prev; | ||
213 | } | ||
214 | return NULL; | ||
215 | } | ||
216 | |||
217 | static inline struct rb_node *tree_search(struct rb_root *root, u64 offset) | ||
218 | { | ||
219 | struct rb_node *prev; | ||
220 | struct rb_node *ret; | ||
221 | ret = __tree_search(root, offset, &prev, NULL); | ||
222 | if (!ret) | ||
223 | return prev; | ||
224 | return ret; | ||
225 | } | ||
226 | |||
227 | /* | ||
228 | * utility function to look for merge candidates inside a given range. | ||
229 | * Any extents with matching state are merged together into a single | ||
230 | * extent in the tree. Extents with EXTENT_IO in their state field | ||
231 | * are not merged because the end_io handlers need to be able to do | ||
232 | * operations on them without sleeping (or doing allocations/splits). | ||
233 | * | ||
234 | * This should be called with the tree lock held. | ||
235 | */ | ||
236 | static int merge_state(struct extent_io_tree *tree, | ||
237 | struct extent_state *state) | ||
238 | { | ||
239 | struct extent_state *other; | ||
240 | struct rb_node *other_node; | ||
241 | |||
242 | if (state->state & EXTENT_IOBITS) | ||
243 | return 0; | ||
244 | |||
245 | other_node = rb_prev(&state->rb_node); | ||
246 | if (other_node) { | ||
247 | other = rb_entry(other_node, struct extent_state, rb_node); | ||
248 | if (other->end == state->start - 1 && | ||
249 | other->state == state->state) { | ||
250 | state->start = other->start; | ||
251 | other->in_tree = 0; | ||
252 | rb_erase(&other->rb_node, &tree->state); | ||
253 | free_extent_state(other); | ||
254 | } | ||
255 | } | ||
256 | other_node = rb_next(&state->rb_node); | ||
257 | if (other_node) { | ||
258 | other = rb_entry(other_node, struct extent_state, rb_node); | ||
259 | if (other->start == state->end + 1 && | ||
260 | other->state == state->state) { | ||
261 | other->start = state->start; | ||
262 | state->in_tree = 0; | ||
263 | rb_erase(&state->rb_node, &tree->state); | ||
264 | free_extent_state(state); | ||
265 | } | ||
266 | } | ||
267 | return 0; | ||
268 | } | ||
269 | |||
270 | /* | ||
271 | * insert an extent_state struct into the tree. 'bits' are set on the | ||
272 | * struct before it is inserted. | ||
273 | * | ||
274 | * This may return -EEXIST if the extent is already there, in which case the | ||
275 | * state struct is freed. | ||
276 | * | ||
277 | * The tree lock is not taken internally. This is a utility function and | ||
278 | * probably isn't what you want to call (see set/clear_extent_bit). | ||
279 | */ | ||
280 | static int insert_state(struct extent_io_tree *tree, | ||
281 | struct extent_state *state, u64 start, u64 end, | ||
282 | int bits) | ||
283 | { | ||
284 | struct rb_node *node; | ||
285 | |||
286 | if (end < start) { | ||
287 | printk("end < start %Lu %Lu\n", end, start); | ||
288 | WARN_ON(1); | ||
289 | } | ||
290 | if (bits & EXTENT_DIRTY) | ||
291 | tree->dirty_bytes += end - start + 1; | ||
292 | state->state |= bits; | ||
293 | state->start = start; | ||
294 | state->end = end; | ||
295 | node = tree_insert(&tree->state, end, &state->rb_node); | ||
296 | if (node) { | ||
297 | struct extent_state *found; | ||
298 | found = rb_entry(node, struct extent_state, rb_node); | ||
299 | printk("found node %Lu %Lu on insert of %Lu %Lu\n", found->start, found->end, start, end); | ||
300 | free_extent_state(state); | ||
301 | return -EEXIST; | ||
302 | } | ||
303 | merge_state(tree, state); | ||
304 | return 0; | ||
305 | } | ||
306 | |||
307 | /* | ||
308 | * split a given extent state struct in two, inserting the preallocated | ||
309 | * struct 'prealloc' as the newly created second half. 'split' indicates an | ||
310 | * offset inside 'orig' where it should be split. | ||
311 | * | ||
312 | * Before calling, | ||
313 | * the tree has 'orig' at [orig->start, orig->end]. After calling, there | ||
314 | * are two extent state structs in the tree: | ||
315 | * prealloc: [orig->start, split - 1] | ||
316 | * orig: [ split, orig->end ] | ||
317 | * | ||
318 | * The tree locks are not taken by this function. They need to be held | ||
319 | * by the caller. | ||
320 | */ | ||
321 | static int split_state(struct extent_io_tree *tree, struct extent_state *orig, | ||
322 | struct extent_state *prealloc, u64 split) | ||
323 | { | ||
324 | struct rb_node *node; | ||
325 | prealloc->start = orig->start; | ||
326 | prealloc->end = split - 1; | ||
327 | prealloc->state = orig->state; | ||
328 | orig->start = split; | ||
329 | |||
330 | node = tree_insert(&tree->state, prealloc->end, &prealloc->rb_node); | ||
331 | if (node) { | ||
332 | struct extent_state *found; | ||
333 | found = rb_entry(node, struct extent_state, rb_node); | ||
334 | printk("found node %Lu %Lu on insert of %Lu %Lu\n", found->start, found->end, prealloc->start, prealloc->end); | ||
335 | free_extent_state(prealloc); | ||
336 | return -EEXIST; | ||
337 | } | ||
338 | return 0; | ||
339 | } | ||
340 | |||
341 | /* | ||
342 | * utility function to clear some bits in an extent state struct. | ||
343 | * it will optionally wake up any one waiting on this state (wake == 1), or | ||
344 | * forcibly remove the state from the tree (delete == 1). | ||
345 | * | ||
346 | * If no bits are set on the state struct after clearing things, the | ||
347 | * struct is freed and removed from the tree | ||
348 | */ | ||
349 | static int clear_state_bit(struct extent_io_tree *tree, | ||
350 | struct extent_state *state, int bits, int wake, | ||
351 | int delete) | ||
352 | { | ||
353 | int ret = state->state & bits; | ||
354 | |||
355 | if ((bits & EXTENT_DIRTY) && (state->state & EXTENT_DIRTY)) { | ||
356 | u64 range = state->end - state->start + 1; | ||
357 | WARN_ON(range > tree->dirty_bytes); | ||
358 | tree->dirty_bytes -= range; | ||
359 | } | ||
360 | state->state &= ~bits; | ||
361 | if (wake) | ||
362 | wake_up(&state->wq); | ||
363 | if (delete || state->state == 0) { | ||
364 | if (state->in_tree) { | ||
365 | rb_erase(&state->rb_node, &tree->state); | ||
366 | state->in_tree = 0; | ||
367 | free_extent_state(state); | ||
368 | } else { | ||
369 | WARN_ON(1); | ||
370 | } | ||
371 | } else { | ||
372 | merge_state(tree, state); | ||
373 | } | ||
374 | return ret; | ||
375 | } | ||
376 | |||
377 | /* | ||
378 | * clear some bits on a range in the tree. This may require splitting | ||
379 | * or inserting elements in the tree, so the gfp mask is used to | ||
380 | * indicate which allocations or sleeping are allowed. | ||
381 | * | ||
382 | * pass 'wake' == 1 to kick any sleepers, and 'delete' == 1 to remove | ||
383 | * the given range from the tree regardless of state (ie for truncate). | ||
384 | * | ||
385 | * the range [start, end] is inclusive. | ||
386 | * | ||
387 | * This takes the tree lock, and returns < 0 on error, > 0 if any of the | ||
388 | * bits were already set, or zero if none of the bits were already set. | ||
389 | */ | ||
390 | int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, | ||
391 | int bits, int wake, int delete, gfp_t mask) | ||
392 | { | ||
393 | struct extent_state *state; | ||
394 | struct extent_state *prealloc = NULL; | ||
395 | struct rb_node *node; | ||
396 | unsigned long flags; | ||
397 | int err; | ||
398 | int set = 0; | ||
399 | |||
400 | again: | ||
401 | if (!prealloc && (mask & __GFP_WAIT)) { | ||
402 | prealloc = alloc_extent_state(mask); | ||
403 | if (!prealloc) | ||
404 | return -ENOMEM; | ||
405 | } | ||
406 | |||
407 | write_lock_irqsave(&tree->lock, flags); | ||
408 | /* | ||
409 | * this search will find the extents that end after | ||
410 | * our range starts | ||
411 | */ | ||
412 | node = tree_search(&tree->state, start); | ||
413 | if (!node) | ||
414 | goto out; | ||
415 | state = rb_entry(node, struct extent_state, rb_node); | ||
416 | if (state->start > end) | ||
417 | goto out; | ||
418 | WARN_ON(state->end < start); | ||
419 | |||
420 | /* | ||
421 | * | ---- desired range ---- | | ||
422 | * | state | or | ||
423 | * | ------------- state -------------- | | ||
424 | * | ||
425 | * We need to split the extent we found, and may flip | ||
426 | * bits on second half. | ||
427 | * | ||
428 | * If the extent we found extends past our range, we | ||
429 | * just split and search again. It'll get split again | ||
430 | * the next time though. | ||
431 | * | ||
432 | * If the extent we found is inside our range, we clear | ||
433 | * the desired bit on it. | ||
434 | */ | ||
435 | |||
436 | if (state->start < start) { | ||
437 | err = split_state(tree, state, prealloc, start); | ||
438 | BUG_ON(err == -EEXIST); | ||
439 | prealloc = NULL; | ||
440 | if (err) | ||
441 | goto out; | ||
442 | if (state->end <= end) { | ||
443 | start = state->end + 1; | ||
444 | set |= clear_state_bit(tree, state, bits, | ||
445 | wake, delete); | ||
446 | } else { | ||
447 | start = state->start; | ||
448 | } | ||
449 | goto search_again; | ||
450 | } | ||
451 | /* | ||
452 | * | ---- desired range ---- | | ||
453 | * | state | | ||
454 | * We need to split the extent, and clear the bit | ||
455 | * on the first half | ||
456 | */ | ||
457 | if (state->start <= end && state->end > end) { | ||
458 | err = split_state(tree, state, prealloc, end + 1); | ||
459 | BUG_ON(err == -EEXIST); | ||
460 | |||
461 | if (wake) | ||
462 | wake_up(&state->wq); | ||
463 | set |= clear_state_bit(tree, prealloc, bits, | ||
464 | wake, delete); | ||
465 | prealloc = NULL; | ||
466 | goto out; | ||
467 | } | ||
468 | |||
469 | start = state->end + 1; | ||
470 | set |= clear_state_bit(tree, state, bits, wake, delete); | ||
471 | goto search_again; | ||
472 | |||
473 | out: | ||
474 | write_unlock_irqrestore(&tree->lock, flags); | ||
475 | if (prealloc) | ||
476 | free_extent_state(prealloc); | ||
477 | |||
478 | return set; | ||
479 | |||
480 | search_again: | ||
481 | if (start > end) | ||
482 | goto out; | ||
483 | write_unlock_irqrestore(&tree->lock, flags); | ||
484 | if (mask & __GFP_WAIT) | ||
485 | cond_resched(); | ||
486 | goto again; | ||
487 | } | ||
488 | EXPORT_SYMBOL(clear_extent_bit); | ||
489 | |||
490 | static int wait_on_state(struct extent_io_tree *tree, | ||
491 | struct extent_state *state) | ||
492 | { | ||
493 | DEFINE_WAIT(wait); | ||
494 | prepare_to_wait(&state->wq, &wait, TASK_UNINTERRUPTIBLE); | ||
495 | read_unlock_irq(&tree->lock); | ||
496 | schedule(); | ||
497 | read_lock_irq(&tree->lock); | ||
498 | finish_wait(&state->wq, &wait); | ||
499 | return 0; | ||
500 | } | ||
501 | |||
502 | /* | ||
503 | * waits for one or more bits to clear on a range in the state tree. | ||
504 | * The range [start, end] is inclusive. | ||
505 | * The tree lock is taken by this function | ||
506 | */ | ||
507 | int wait_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, int bits) | ||
508 | { | ||
509 | struct extent_state *state; | ||
510 | struct rb_node *node; | ||
511 | |||
512 | read_lock_irq(&tree->lock); | ||
513 | again: | ||
514 | while (1) { | ||
515 | /* | ||
516 | * this search will find all the extents that end after | ||
517 | * our range starts | ||
518 | */ | ||
519 | node = tree_search(&tree->state, start); | ||
520 | if (!node) | ||
521 | break; | ||
522 | |||
523 | state = rb_entry(node, struct extent_state, rb_node); | ||
524 | |||
525 | if (state->start > end) | ||
526 | goto out; | ||
527 | |||
528 | if (state->state & bits) { | ||
529 | start = state->start; | ||
530 | atomic_inc(&state->refs); | ||
531 | wait_on_state(tree, state); | ||
532 | free_extent_state(state); | ||
533 | goto again; | ||
534 | } | ||
535 | start = state->end + 1; | ||
536 | |||
537 | if (start > end) | ||
538 | break; | ||
539 | |||
540 | if (need_resched()) { | ||
541 | read_unlock_irq(&tree->lock); | ||
542 | cond_resched(); | ||
543 | read_lock_irq(&tree->lock); | ||
544 | } | ||
545 | } | ||
546 | out: | ||
547 | read_unlock_irq(&tree->lock); | ||
548 | return 0; | ||
549 | } | ||
550 | EXPORT_SYMBOL(wait_extent_bit); | ||
551 | |||
552 | static void set_state_bits(struct extent_io_tree *tree, | ||
553 | struct extent_state *state, | ||
554 | int bits) | ||
555 | { | ||
556 | if ((bits & EXTENT_DIRTY) && !(state->state & EXTENT_DIRTY)) { | ||
557 | u64 range = state->end - state->start + 1; | ||
558 | tree->dirty_bytes += range; | ||
559 | } | ||
560 | state->state |= bits; | ||
561 | } | ||
562 | |||
563 | /* | ||
564 | * set some bits on a range in the tree. This may require allocations | ||
565 | * or sleeping, so the gfp mask is used to indicate what is allowed. | ||
566 | * | ||
567 | * If 'exclusive' == 1, this will fail with -EEXIST if some part of the | ||
568 | * range already has the desired bits set. The start of the existing | ||
569 | * range is returned in failed_start in this case. | ||
570 | * | ||
571 | * [start, end] is inclusive | ||
572 | * This takes the tree lock. | ||
573 | */ | ||
574 | int set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, int bits, | ||
575 | int exclusive, u64 *failed_start, gfp_t mask) | ||
576 | { | ||
577 | struct extent_state *state; | ||
578 | struct extent_state *prealloc = NULL; | ||
579 | struct rb_node *node; | ||
580 | unsigned long flags; | ||
581 | int err = 0; | ||
582 | int set; | ||
583 | u64 last_start; | ||
584 | u64 last_end; | ||
585 | again: | ||
586 | if (!prealloc && (mask & __GFP_WAIT)) { | ||
587 | prealloc = alloc_extent_state(mask); | ||
588 | if (!prealloc) | ||
589 | return -ENOMEM; | ||
590 | } | ||
591 | |||
592 | write_lock_irqsave(&tree->lock, flags); | ||
593 | /* | ||
594 | * this search will find all the extents that end after | ||
595 | * our range starts. | ||
596 | */ | ||
597 | node = tree_search(&tree->state, start); | ||
598 | if (!node) { | ||
599 | err = insert_state(tree, prealloc, start, end, bits); | ||
600 | prealloc = NULL; | ||
601 | BUG_ON(err == -EEXIST); | ||
602 | goto out; | ||
603 | } | ||
604 | |||
605 | state = rb_entry(node, struct extent_state, rb_node); | ||
606 | last_start = state->start; | ||
607 | last_end = state->end; | ||
608 | |||
609 | /* | ||
610 | * | ---- desired range ---- | | ||
611 | * | state | | ||
612 | * | ||
613 | * Just lock what we found and keep going | ||
614 | */ | ||
615 | if (state->start == start && state->end <= end) { | ||
616 | set = state->state & bits; | ||
617 | if (set && exclusive) { | ||
618 | *failed_start = state->start; | ||
619 | err = -EEXIST; | ||
620 | goto out; | ||
621 | } | ||
622 | set_state_bits(tree, state, bits); | ||
623 | start = state->end + 1; | ||
624 | merge_state(tree, state); | ||
625 | goto search_again; | ||
626 | } | ||
627 | |||
628 | /* | ||
629 | * | ---- desired range ---- | | ||
630 | * | state | | ||
631 | * or | ||
632 | * | ------------- state -------------- | | ||
633 | * | ||
634 | * We need to split the extent we found, and may flip bits on | ||
635 | * second half. | ||
636 | * | ||
637 | * If the extent we found extends past our | ||
638 | * range, we just split and search again. It'll get split | ||
639 | * again the next time though. | ||
640 | * | ||
641 | * If the extent we found is inside our range, we set the | ||
642 | * desired bit on it. | ||
643 | */ | ||
644 | if (state->start < start) { | ||
645 | set = state->state & bits; | ||
646 | if (exclusive && set) { | ||
647 | *failed_start = start; | ||
648 | err = -EEXIST; | ||
649 | goto out; | ||
650 | } | ||
651 | err = split_state(tree, state, prealloc, start); | ||
652 | BUG_ON(err == -EEXIST); | ||
653 | prealloc = NULL; | ||
654 | if (err) | ||
655 | goto out; | ||
656 | if (state->end <= end) { | ||
657 | set_state_bits(tree, state, bits); | ||
658 | start = state->end + 1; | ||
659 | merge_state(tree, state); | ||
660 | } else { | ||
661 | start = state->start; | ||
662 | } | ||
663 | goto search_again; | ||
664 | } | ||
665 | /* | ||
666 | * | ---- desired range ---- | | ||
667 | * | state | or | state | | ||
668 | * | ||
669 | * There's a hole, we need to insert something in it and | ||
670 | * ignore the extent we found. | ||
671 | */ | ||
672 | if (state->start > start) { | ||
673 | u64 this_end; | ||
674 | if (end < last_start) | ||
675 | this_end = end; | ||
676 | else | ||
677 | this_end = last_start -1; | ||
678 | err = insert_state(tree, prealloc, start, this_end, | ||
679 | bits); | ||
680 | prealloc = NULL; | ||
681 | BUG_ON(err == -EEXIST); | ||
682 | if (err) | ||
683 | goto out; | ||
684 | start = this_end + 1; | ||
685 | goto search_again; | ||
686 | } | ||
687 | /* | ||
688 | * | ---- desired range ---- | | ||
689 | * | state | | ||
690 | * We need to split the extent, and set the bit | ||
691 | * on the first half | ||
692 | */ | ||
693 | if (state->start <= end && state->end > end) { | ||
694 | set = state->state & bits; | ||
695 | if (exclusive && set) { | ||
696 | *failed_start = start; | ||
697 | err = -EEXIST; | ||
698 | goto out; | ||
699 | } | ||
700 | err = split_state(tree, state, prealloc, end + 1); | ||
701 | BUG_ON(err == -EEXIST); | ||
702 | |||
703 | set_state_bits(tree, prealloc, bits); | ||
704 | merge_state(tree, prealloc); | ||
705 | prealloc = NULL; | ||
706 | goto out; | ||
707 | } | ||
708 | |||
709 | goto search_again; | ||
710 | |||
711 | out: | ||
712 | write_unlock_irqrestore(&tree->lock, flags); | ||
713 | if (prealloc) | ||
714 | free_extent_state(prealloc); | ||
715 | |||
716 | return err; | ||
717 | |||
718 | search_again: | ||
719 | if (start > end) | ||
720 | goto out; | ||
721 | write_unlock_irqrestore(&tree->lock, flags); | ||
722 | if (mask & __GFP_WAIT) | ||
723 | cond_resched(); | ||
724 | goto again; | ||
725 | } | ||
726 | EXPORT_SYMBOL(set_extent_bit); | ||
727 | |||
728 | /* wrappers around set/clear extent bit */ | ||
729 | int set_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end, | ||
730 | gfp_t mask) | ||
731 | { | ||
732 | return set_extent_bit(tree, start, end, EXTENT_DIRTY, 0, NULL, | ||
733 | mask); | ||
734 | } | ||
735 | EXPORT_SYMBOL(set_extent_dirty); | ||
736 | |||
737 | int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end, | ||
738 | int bits, gfp_t mask) | ||
739 | { | ||
740 | return set_extent_bit(tree, start, end, bits, 0, NULL, | ||
741 | mask); | ||
742 | } | ||
743 | EXPORT_SYMBOL(set_extent_bits); | ||
744 | |||
745 | int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end, | ||
746 | int bits, gfp_t mask) | ||
747 | { | ||
748 | return clear_extent_bit(tree, start, end, bits, 0, 0, mask); | ||
749 | } | ||
750 | EXPORT_SYMBOL(clear_extent_bits); | ||
751 | |||
752 | int set_extent_delalloc(struct extent_io_tree *tree, u64 start, u64 end, | ||
753 | gfp_t mask) | ||
754 | { | ||
755 | return set_extent_bit(tree, start, end, | ||
756 | EXTENT_DELALLOC | EXTENT_DIRTY, 0, NULL, | ||
757 | mask); | ||
758 | } | ||
759 | EXPORT_SYMBOL(set_extent_delalloc); | ||
760 | |||
761 | int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end, | ||
762 | gfp_t mask) | ||
763 | { | ||
764 | return clear_extent_bit(tree, start, end, | ||
765 | EXTENT_DIRTY | EXTENT_DELALLOC, 0, 0, mask); | ||
766 | } | ||
767 | EXPORT_SYMBOL(clear_extent_dirty); | ||
768 | |||
769 | int set_extent_new(struct extent_io_tree *tree, u64 start, u64 end, | ||
770 | gfp_t mask) | ||
771 | { | ||
772 | return set_extent_bit(tree, start, end, EXTENT_NEW, 0, NULL, | ||
773 | mask); | ||
774 | } | ||
775 | EXPORT_SYMBOL(set_extent_new); | ||
776 | |||
777 | int clear_extent_new(struct extent_io_tree *tree, u64 start, u64 end, | ||
778 | gfp_t mask) | ||
779 | { | ||
780 | return clear_extent_bit(tree, start, end, EXTENT_NEW, 0, 0, mask); | ||
781 | } | ||
782 | EXPORT_SYMBOL(clear_extent_new); | ||
783 | |||
784 | int set_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end, | ||
785 | gfp_t mask) | ||
786 | { | ||
787 | return set_extent_bit(tree, start, end, EXTENT_UPTODATE, 0, NULL, | ||
788 | mask); | ||
789 | } | ||
790 | EXPORT_SYMBOL(set_extent_uptodate); | ||
791 | |||
792 | int clear_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end, | ||
793 | gfp_t mask) | ||
794 | { | ||
795 | return clear_extent_bit(tree, start, end, EXTENT_UPTODATE, 0, 0, mask); | ||
796 | } | ||
797 | EXPORT_SYMBOL(clear_extent_uptodate); | ||
798 | |||
799 | int set_extent_writeback(struct extent_io_tree *tree, u64 start, u64 end, | ||
800 | gfp_t mask) | ||
801 | { | ||
802 | return set_extent_bit(tree, start, end, EXTENT_WRITEBACK, | ||
803 | 0, NULL, mask); | ||
804 | } | ||
805 | EXPORT_SYMBOL(set_extent_writeback); | ||
806 | |||
807 | int clear_extent_writeback(struct extent_io_tree *tree, u64 start, u64 end, | ||
808 | gfp_t mask) | ||
809 | { | ||
810 | return clear_extent_bit(tree, start, end, EXTENT_WRITEBACK, 1, 0, mask); | ||
811 | } | ||
812 | EXPORT_SYMBOL(clear_extent_writeback); | ||
813 | |||
814 | int wait_on_extent_writeback(struct extent_io_tree *tree, u64 start, u64 end) | ||
815 | { | ||
816 | return wait_extent_bit(tree, start, end, EXTENT_WRITEBACK); | ||
817 | } | ||
818 | EXPORT_SYMBOL(wait_on_extent_writeback); | ||
819 | |||
820 | /* | ||
821 | * locks a range in ascending order, waiting for any locked regions | ||
822 | * it hits on the way. [start,end] are inclusive, and this will sleep. | ||
823 | */ | ||
824 | int lock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask) | ||
825 | { | ||
826 | int err; | ||
827 | u64 failed_start; | ||
828 | while (1) { | ||
829 | err = set_extent_bit(tree, start, end, EXTENT_LOCKED, 1, | ||
830 | &failed_start, mask); | ||
831 | if (err == -EEXIST && (mask & __GFP_WAIT)) { | ||
832 | wait_extent_bit(tree, failed_start, end, EXTENT_LOCKED); | ||
833 | start = failed_start; | ||
834 | } else { | ||
835 | break; | ||
836 | } | ||
837 | WARN_ON(start > end); | ||
838 | } | ||
839 | return err; | ||
840 | } | ||
841 | EXPORT_SYMBOL(lock_extent); | ||
842 | |||
843 | int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end, | ||
844 | gfp_t mask) | ||
845 | { | ||
846 | return clear_extent_bit(tree, start, end, EXTENT_LOCKED, 1, 0, mask); | ||
847 | } | ||
848 | EXPORT_SYMBOL(unlock_extent); | ||
849 | |||
850 | /* | ||
851 | * helper function to set pages and extents in the tree dirty | ||
852 | */ | ||
853 | int set_range_dirty(struct extent_io_tree *tree, u64 start, u64 end) | ||
854 | { | ||
855 | unsigned long index = start >> PAGE_CACHE_SHIFT; | ||
856 | unsigned long end_index = end >> PAGE_CACHE_SHIFT; | ||
857 | struct page *page; | ||
858 | |||
859 | while (index <= end_index) { | ||
860 | page = find_get_page(tree->mapping, index); | ||
861 | BUG_ON(!page); | ||
862 | __set_page_dirty_nobuffers(page); | ||
863 | page_cache_release(page); | ||
864 | index++; | ||
865 | } | ||
866 | set_extent_dirty(tree, start, end, GFP_NOFS); | ||
867 | return 0; | ||
868 | } | ||
869 | EXPORT_SYMBOL(set_range_dirty); | ||
870 | |||
871 | /* | ||
872 | * helper function to set both pages and extents in the tree writeback | ||
873 | */ | ||
874 | int set_range_writeback(struct extent_io_tree *tree, u64 start, u64 end) | ||
875 | { | ||
876 | unsigned long index = start >> PAGE_CACHE_SHIFT; | ||
877 | unsigned long end_index = end >> PAGE_CACHE_SHIFT; | ||
878 | struct page *page; | ||
879 | |||
880 | while (index <= end_index) { | ||
881 | page = find_get_page(tree->mapping, index); | ||
882 | BUG_ON(!page); | ||
883 | set_page_writeback(page); | ||
884 | page_cache_release(page); | ||
885 | index++; | ||
886 | } | ||
887 | set_extent_writeback(tree, start, end, GFP_NOFS); | ||
888 | return 0; | ||
889 | } | ||
890 | EXPORT_SYMBOL(set_range_writeback); | ||
891 | |||
892 | int find_first_extent_bit(struct extent_io_tree *tree, u64 start, | ||
893 | u64 *start_ret, u64 *end_ret, int bits) | ||
894 | { | ||
895 | struct rb_node *node; | ||
896 | struct extent_state *state; | ||
897 | int ret = 1; | ||
898 | |||
899 | read_lock_irq(&tree->lock); | ||
900 | /* | ||
901 | * this search will find all the extents that end after | ||
902 | * our range starts. | ||
903 | */ | ||
904 | node = tree_search(&tree->state, start); | ||
905 | if (!node || IS_ERR(node)) { | ||
906 | goto out; | ||
907 | } | ||
908 | |||
909 | while(1) { | ||
910 | state = rb_entry(node, struct extent_state, rb_node); | ||
911 | if (state->end >= start && (state->state & bits)) { | ||
912 | *start_ret = state->start; | ||
913 | *end_ret = state->end; | ||
914 | ret = 0; | ||
915 | break; | ||
916 | } | ||
917 | node = rb_next(node); | ||
918 | if (!node) | ||
919 | break; | ||
920 | } | ||
921 | out: | ||
922 | read_unlock_irq(&tree->lock); | ||
923 | return ret; | ||
924 | } | ||
925 | EXPORT_SYMBOL(find_first_extent_bit); | ||
926 | |||
927 | u64 find_lock_delalloc_range(struct extent_io_tree *tree, | ||
928 | u64 *start, u64 *end, u64 max_bytes) | ||
929 | { | ||
930 | struct rb_node *node; | ||
931 | struct extent_state *state; | ||
932 | u64 cur_start = *start; | ||
933 | u64 found = 0; | ||
934 | u64 total_bytes = 0; | ||
935 | |||
936 | write_lock_irq(&tree->lock); | ||
937 | /* | ||
938 | * this search will find all the extents that end after | ||
939 | * our range starts. | ||
940 | */ | ||
941 | search_again: | ||
942 | node = tree_search(&tree->state, cur_start); | ||
943 | if (!node || IS_ERR(node)) { | ||
944 | *end = (u64)-1; | ||
945 | goto out; | ||
946 | } | ||
947 | |||
948 | while(1) { | ||
949 | state = rb_entry(node, struct extent_state, rb_node); | ||
950 | if (found && state->start != cur_start) { | ||
951 | goto out; | ||
952 | } | ||
953 | if (!(state->state & EXTENT_DELALLOC)) { | ||
954 | if (!found) | ||
955 | *end = state->end; | ||
956 | goto out; | ||
957 | } | ||
958 | if (!found) { | ||
959 | struct extent_state *prev_state; | ||
960 | struct rb_node *prev_node = node; | ||
961 | while(1) { | ||
962 | prev_node = rb_prev(prev_node); | ||
963 | if (!prev_node) | ||
964 | break; | ||
965 | prev_state = rb_entry(prev_node, | ||
966 | struct extent_state, | ||
967 | rb_node); | ||
968 | if (!(prev_state->state & EXTENT_DELALLOC)) | ||
969 | break; | ||
970 | state = prev_state; | ||
971 | node = prev_node; | ||
972 | } | ||
973 | } | ||
974 | if (state->state & EXTENT_LOCKED) { | ||
975 | DEFINE_WAIT(wait); | ||
976 | atomic_inc(&state->refs); | ||
977 | prepare_to_wait(&state->wq, &wait, | ||
978 | TASK_UNINTERRUPTIBLE); | ||
979 | write_unlock_irq(&tree->lock); | ||
980 | schedule(); | ||
981 | write_lock_irq(&tree->lock); | ||
982 | finish_wait(&state->wq, &wait); | ||
983 | free_extent_state(state); | ||
984 | goto search_again; | ||
985 | } | ||
986 | state->state |= EXTENT_LOCKED; | ||
987 | if (!found) | ||
988 | *start = state->start; | ||
989 | found++; | ||
990 | *end = state->end; | ||
991 | cur_start = state->end + 1; | ||
992 | node = rb_next(node); | ||
993 | if (!node) | ||
994 | break; | ||
995 | total_bytes += state->end - state->start + 1; | ||
996 | if (total_bytes >= max_bytes) | ||
997 | break; | ||
998 | } | ||
999 | out: | ||
1000 | write_unlock_irq(&tree->lock); | ||
1001 | return found; | ||
1002 | } | ||
1003 | |||
1004 | u64 count_range_bits(struct extent_io_tree *tree, | ||
1005 | u64 *start, u64 search_end, u64 max_bytes, | ||
1006 | unsigned long bits) | ||
1007 | { | ||
1008 | struct rb_node *node; | ||
1009 | struct extent_state *state; | ||
1010 | u64 cur_start = *start; | ||
1011 | u64 total_bytes = 0; | ||
1012 | int found = 0; | ||
1013 | |||
1014 | if (search_end <= cur_start) { | ||
1015 | printk("search_end %Lu start %Lu\n", search_end, cur_start); | ||
1016 | WARN_ON(1); | ||
1017 | return 0; | ||
1018 | } | ||
1019 | |||
1020 | write_lock_irq(&tree->lock); | ||
1021 | if (cur_start == 0 && bits == EXTENT_DIRTY) { | ||
1022 | total_bytes = tree->dirty_bytes; | ||
1023 | goto out; | ||
1024 | } | ||
1025 | /* | ||
1026 | * this search will find all the extents that end after | ||
1027 | * our range starts. | ||
1028 | */ | ||
1029 | node = tree_search(&tree->state, cur_start); | ||
1030 | if (!node || IS_ERR(node)) { | ||
1031 | goto out; | ||
1032 | } | ||
1033 | |||
1034 | while(1) { | ||
1035 | state = rb_entry(node, struct extent_state, rb_node); | ||
1036 | if (state->start > search_end) | ||
1037 | break; | ||
1038 | if (state->end >= cur_start && (state->state & bits)) { | ||
1039 | total_bytes += min(search_end, state->end) + 1 - | ||
1040 | max(cur_start, state->start); | ||
1041 | if (total_bytes >= max_bytes) | ||
1042 | break; | ||
1043 | if (!found) { | ||
1044 | *start = state->start; | ||
1045 | found = 1; | ||
1046 | } | ||
1047 | } | ||
1048 | node = rb_next(node); | ||
1049 | if (!node) | ||
1050 | break; | ||
1051 | } | ||
1052 | out: | ||
1053 | write_unlock_irq(&tree->lock); | ||
1054 | return total_bytes; | ||
1055 | } | ||
1056 | /* | ||
1057 | * helper function to lock both pages and extents in the tree. | ||
1058 | * pages must be locked first. | ||
1059 | */ | ||
1060 | int lock_range(struct extent_io_tree *tree, u64 start, u64 end) | ||
1061 | { | ||
1062 | unsigned long index = start >> PAGE_CACHE_SHIFT; | ||
1063 | unsigned long end_index = end >> PAGE_CACHE_SHIFT; | ||
1064 | struct page *page; | ||
1065 | int err; | ||
1066 | |||
1067 | while (index <= end_index) { | ||
1068 | page = grab_cache_page(tree->mapping, index); | ||
1069 | if (!page) { | ||
1070 | err = -ENOMEM; | ||
1071 | goto failed; | ||
1072 | } | ||
1073 | if (IS_ERR(page)) { | ||
1074 | err = PTR_ERR(page); | ||
1075 | goto failed; | ||
1076 | } | ||
1077 | index++; | ||
1078 | } | ||
1079 | lock_extent(tree, start, end, GFP_NOFS); | ||
1080 | return 0; | ||
1081 | |||
1082 | failed: | ||
1083 | /* | ||
1084 | * we failed above in getting the page at 'index', so we undo here | ||
1085 | * up to but not including the page at 'index' | ||
1086 | */ | ||
1087 | end_index = index; | ||
1088 | index = start >> PAGE_CACHE_SHIFT; | ||
1089 | while (index < end_index) { | ||
1090 | page = find_get_page(tree->mapping, index); | ||
1091 | unlock_page(page); | ||
1092 | page_cache_release(page); | ||
1093 | index++; | ||
1094 | } | ||
1095 | return err; | ||
1096 | } | ||
1097 | EXPORT_SYMBOL(lock_range); | ||
1098 | |||
1099 | /* | ||
1100 | * helper function to unlock both pages and extents in the tree. | ||
1101 | */ | ||
1102 | int unlock_range(struct extent_io_tree *tree, u64 start, u64 end) | ||
1103 | { | ||
1104 | unsigned long index = start >> PAGE_CACHE_SHIFT; | ||
1105 | unsigned long end_index = end >> PAGE_CACHE_SHIFT; | ||
1106 | struct page *page; | ||
1107 | |||
1108 | while (index <= end_index) { | ||
1109 | page = find_get_page(tree->mapping, index); | ||
1110 | unlock_page(page); | ||
1111 | page_cache_release(page); | ||
1112 | index++; | ||
1113 | } | ||
1114 | unlock_extent(tree, start, end, GFP_NOFS); | ||
1115 | return 0; | ||
1116 | } | ||
1117 | EXPORT_SYMBOL(unlock_range); | ||
1118 | |||
1119 | int set_state_private(struct extent_io_tree *tree, u64 start, u64 private) | ||
1120 | { | ||
1121 | struct rb_node *node; | ||
1122 | struct extent_state *state; | ||
1123 | int ret = 0; | ||
1124 | |||
1125 | write_lock_irq(&tree->lock); | ||
1126 | /* | ||
1127 | * this search will find all the extents that end after | ||
1128 | * our range starts. | ||
1129 | */ | ||
1130 | node = tree_search(&tree->state, start); | ||
1131 | if (!node || IS_ERR(node)) { | ||
1132 | ret = -ENOENT; | ||
1133 | goto out; | ||
1134 | } | ||
1135 | state = rb_entry(node, struct extent_state, rb_node); | ||
1136 | if (state->start != start) { | ||
1137 | ret = -ENOENT; | ||
1138 | goto out; | ||
1139 | } | ||
1140 | state->private = private; | ||
1141 | out: | ||
1142 | write_unlock_irq(&tree->lock); | ||
1143 | return ret; | ||
1144 | } | ||
1145 | |||
1146 | int get_state_private(struct extent_io_tree *tree, u64 start, u64 *private) | ||
1147 | { | ||
1148 | struct rb_node *node; | ||
1149 | struct extent_state *state; | ||
1150 | int ret = 0; | ||
1151 | |||
1152 | read_lock_irq(&tree->lock); | ||
1153 | /* | ||
1154 | * this search will find all the extents that end after | ||
1155 | * our range starts. | ||
1156 | */ | ||
1157 | node = tree_search(&tree->state, start); | ||
1158 | if (!node || IS_ERR(node)) { | ||
1159 | ret = -ENOENT; | ||
1160 | goto out; | ||
1161 | } | ||
1162 | state = rb_entry(node, struct extent_state, rb_node); | ||
1163 | if (state->start != start) { | ||
1164 | ret = -ENOENT; | ||
1165 | goto out; | ||
1166 | } | ||
1167 | *private = state->private; | ||
1168 | out: | ||
1169 | read_unlock_irq(&tree->lock); | ||
1170 | return ret; | ||
1171 | } | ||
1172 | |||
1173 | /* | ||
1174 | * searches a range in the state tree for a given mask. | ||
1175 | * If 'filled' == 1, this returns 1 only if ever extent in the tree | ||
1176 | * has the bits set. Otherwise, 1 is returned if any bit in the | ||
1177 | * range is found set. | ||
1178 | */ | ||
1179 | int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end, | ||
1180 | int bits, int filled) | ||
1181 | { | ||
1182 | struct extent_state *state = NULL; | ||
1183 | struct rb_node *node; | ||
1184 | int bitset = 0; | ||
1185 | unsigned long flags; | ||
1186 | |||
1187 | read_lock_irqsave(&tree->lock, flags); | ||
1188 | node = tree_search(&tree->state, start); | ||
1189 | while (node && start <= end) { | ||
1190 | state = rb_entry(node, struct extent_state, rb_node); | ||
1191 | |||
1192 | if (filled && state->start > start) { | ||
1193 | bitset = 0; | ||
1194 | break; | ||
1195 | } | ||
1196 | |||
1197 | if (state->start > end) | ||
1198 | break; | ||
1199 | |||
1200 | if (state->state & bits) { | ||
1201 | bitset = 1; | ||
1202 | if (!filled) | ||
1203 | break; | ||
1204 | } else if (filled) { | ||
1205 | bitset = 0; | ||
1206 | break; | ||
1207 | } | ||
1208 | start = state->end + 1; | ||
1209 | if (start > end) | ||
1210 | break; | ||
1211 | node = rb_next(node); | ||
1212 | if (!node) { | ||
1213 | if (filled) | ||
1214 | bitset = 0; | ||
1215 | break; | ||
1216 | } | ||
1217 | } | ||
1218 | read_unlock_irqrestore(&tree->lock, flags); | ||
1219 | return bitset; | ||
1220 | } | ||
1221 | EXPORT_SYMBOL(test_range_bit); | ||
1222 | |||
1223 | /* | ||
1224 | * helper function to set a given page up to date if all the | ||
1225 | * extents in the tree for that page are up to date | ||
1226 | */ | ||
1227 | static int check_page_uptodate(struct extent_io_tree *tree, | ||
1228 | struct page *page) | ||
1229 | { | ||
1230 | u64 start = (u64)page->index << PAGE_CACHE_SHIFT; | ||
1231 | u64 end = start + PAGE_CACHE_SIZE - 1; | ||
1232 | if (test_range_bit(tree, start, end, EXTENT_UPTODATE, 1)) | ||
1233 | SetPageUptodate(page); | ||
1234 | return 0; | ||
1235 | } | ||
1236 | |||
1237 | /* | ||
1238 | * helper function to unlock a page if all the extents in the tree | ||
1239 | * for that page are unlocked | ||
1240 | */ | ||
1241 | static int check_page_locked(struct extent_io_tree *tree, | ||
1242 | struct page *page) | ||
1243 | { | ||
1244 | u64 start = (u64)page->index << PAGE_CACHE_SHIFT; | ||
1245 | u64 end = start + PAGE_CACHE_SIZE - 1; | ||
1246 | if (!test_range_bit(tree, start, end, EXTENT_LOCKED, 0)) | ||
1247 | unlock_page(page); | ||
1248 | return 0; | ||
1249 | } | ||
1250 | |||
1251 | /* | ||
1252 | * helper function to end page writeback if all the extents | ||
1253 | * in the tree for that page are done with writeback | ||
1254 | */ | ||
1255 | static int check_page_writeback(struct extent_io_tree *tree, | ||
1256 | struct page *page) | ||
1257 | { | ||
1258 | u64 start = (u64)page->index << PAGE_CACHE_SHIFT; | ||
1259 | u64 end = start + PAGE_CACHE_SIZE - 1; | ||
1260 | if (!test_range_bit(tree, start, end, EXTENT_WRITEBACK, 0)) | ||
1261 | end_page_writeback(page); | ||
1262 | return 0; | ||
1263 | } | ||
1264 | |||
1265 | /* lots and lots of room for performance fixes in the end_bio funcs */ | ||
1266 | |||
1267 | /* | ||
1268 | * after a writepage IO is done, we need to: | ||
1269 | * clear the uptodate bits on error | ||
1270 | * clear the writeback bits in the extent tree for this IO | ||
1271 | * end_page_writeback if the page has no more pending IO | ||
1272 | * | ||
1273 | * Scheduling is not allowed, so the extent state tree is expected | ||
1274 | * to have one and only one object corresponding to this IO. | ||
1275 | */ | ||
1276 | #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23) | ||
1277 | static void end_bio_extent_writepage(struct bio *bio, int err) | ||
1278 | #else | ||
1279 | static int end_bio_extent_writepage(struct bio *bio, | ||
1280 | unsigned int bytes_done, int err) | ||
1281 | #endif | ||
1282 | { | ||
1283 | const int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags); | ||
1284 | struct bio_vec *bvec = bio->bi_io_vec + bio->bi_vcnt - 1; | ||
1285 | struct extent_io_tree *tree = bio->bi_private; | ||
1286 | u64 start; | ||
1287 | u64 end; | ||
1288 | int whole_page; | ||
1289 | |||
1290 | #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,23) | ||
1291 | if (bio->bi_size) | ||
1292 | return 1; | ||
1293 | #endif | ||
1294 | |||
1295 | do { | ||
1296 | struct page *page = bvec->bv_page; | ||
1297 | start = ((u64)page->index << PAGE_CACHE_SHIFT) + | ||
1298 | bvec->bv_offset; | ||
1299 | end = start + bvec->bv_len - 1; | ||
1300 | |||
1301 | if (bvec->bv_offset == 0 && bvec->bv_len == PAGE_CACHE_SIZE) | ||
1302 | whole_page = 1; | ||
1303 | else | ||
1304 | whole_page = 0; | ||
1305 | |||
1306 | if (--bvec >= bio->bi_io_vec) | ||
1307 | prefetchw(&bvec->bv_page->flags); | ||
1308 | |||
1309 | if (!uptodate) { | ||
1310 | clear_extent_uptodate(tree, start, end, GFP_ATOMIC); | ||
1311 | ClearPageUptodate(page); | ||
1312 | SetPageError(page); | ||
1313 | } | ||
1314 | clear_extent_writeback(tree, start, end, GFP_ATOMIC); | ||
1315 | |||
1316 | if (whole_page) | ||
1317 | end_page_writeback(page); | ||
1318 | else | ||
1319 | check_page_writeback(tree, page); | ||
1320 | if (tree->ops && tree->ops->writepage_end_io_hook) | ||
1321 | tree->ops->writepage_end_io_hook(page, start, end); | ||
1322 | } while (bvec >= bio->bi_io_vec); | ||
1323 | |||
1324 | bio_put(bio); | ||
1325 | #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,23) | ||
1326 | return 0; | ||
1327 | #endif | ||
1328 | } | ||
1329 | |||
1330 | /* | ||
1331 | * after a readpage IO is done, we need to: | ||
1332 | * clear the uptodate bits on error | ||
1333 | * set the uptodate bits if things worked | ||
1334 | * set the page up to date if all extents in the tree are uptodate | ||
1335 | * clear the lock bit in the extent tree | ||
1336 | * unlock the page if there are no other extents locked for it | ||
1337 | * | ||
1338 | * Scheduling is not allowed, so the extent state tree is expected | ||
1339 | * to have one and only one object corresponding to this IO. | ||
1340 | */ | ||
1341 | #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23) | ||
1342 | static void end_bio_extent_readpage(struct bio *bio, int err) | ||
1343 | #else | ||
1344 | static int end_bio_extent_readpage(struct bio *bio, | ||
1345 | unsigned int bytes_done, int err) | ||
1346 | #endif | ||
1347 | { | ||
1348 | int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags); | ||
1349 | struct bio_vec *bvec = bio->bi_io_vec + bio->bi_vcnt - 1; | ||
1350 | struct extent_io_tree *tree = bio->bi_private; | ||
1351 | u64 start; | ||
1352 | u64 end; | ||
1353 | int whole_page; | ||
1354 | int ret; | ||
1355 | |||
1356 | #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,23) | ||
1357 | if (bio->bi_size) | ||
1358 | return 1; | ||
1359 | #endif | ||
1360 | |||
1361 | do { | ||
1362 | struct page *page = bvec->bv_page; | ||
1363 | start = ((u64)page->index << PAGE_CACHE_SHIFT) + | ||
1364 | bvec->bv_offset; | ||
1365 | end = start + bvec->bv_len - 1; | ||
1366 | |||
1367 | if (bvec->bv_offset == 0 && bvec->bv_len == PAGE_CACHE_SIZE) | ||
1368 | whole_page = 1; | ||
1369 | else | ||
1370 | whole_page = 0; | ||
1371 | |||
1372 | if (--bvec >= bio->bi_io_vec) | ||
1373 | prefetchw(&bvec->bv_page->flags); | ||
1374 | |||
1375 | if (uptodate && tree->ops && tree->ops->readpage_end_io_hook) { | ||
1376 | ret = tree->ops->readpage_end_io_hook(page, start, end); | ||
1377 | if (ret) | ||
1378 | uptodate = 0; | ||
1379 | } | ||
1380 | if (uptodate) { | ||
1381 | set_extent_uptodate(tree, start, end, GFP_ATOMIC); | ||
1382 | if (whole_page) | ||
1383 | SetPageUptodate(page); | ||
1384 | else | ||
1385 | check_page_uptodate(tree, page); | ||
1386 | } else { | ||
1387 | ClearPageUptodate(page); | ||
1388 | SetPageError(page); | ||
1389 | } | ||
1390 | |||
1391 | unlock_extent(tree, start, end, GFP_ATOMIC); | ||
1392 | |||
1393 | if (whole_page) | ||
1394 | unlock_page(page); | ||
1395 | else | ||
1396 | check_page_locked(tree, page); | ||
1397 | } while (bvec >= bio->bi_io_vec); | ||
1398 | |||
1399 | bio_put(bio); | ||
1400 | #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,23) | ||
1401 | return 0; | ||
1402 | #endif | ||
1403 | } | ||
1404 | |||
1405 | /* | ||
1406 | * IO done from prepare_write is pretty simple, we just unlock | ||
1407 | * the structs in the extent tree when done, and set the uptodate bits | ||
1408 | * as appropriate. | ||
1409 | */ | ||
1410 | #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23) | ||
1411 | static void end_bio_extent_preparewrite(struct bio *bio, int err) | ||
1412 | #else | ||
1413 | static int end_bio_extent_preparewrite(struct bio *bio, | ||
1414 | unsigned int bytes_done, int err) | ||
1415 | #endif | ||
1416 | { | ||
1417 | const int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags); | ||
1418 | struct bio_vec *bvec = bio->bi_io_vec + bio->bi_vcnt - 1; | ||
1419 | struct extent_io_tree *tree = bio->bi_private; | ||
1420 | u64 start; | ||
1421 | u64 end; | ||
1422 | |||
1423 | #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,23) | ||
1424 | if (bio->bi_size) | ||
1425 | return 1; | ||
1426 | #endif | ||
1427 | |||
1428 | do { | ||
1429 | struct page *page = bvec->bv_page; | ||
1430 | start = ((u64)page->index << PAGE_CACHE_SHIFT) + | ||
1431 | bvec->bv_offset; | ||
1432 | end = start + bvec->bv_len - 1; | ||
1433 | |||
1434 | if (--bvec >= bio->bi_io_vec) | ||
1435 | prefetchw(&bvec->bv_page->flags); | ||
1436 | |||
1437 | if (uptodate) { | ||
1438 | set_extent_uptodate(tree, start, end, GFP_ATOMIC); | ||
1439 | } else { | ||
1440 | ClearPageUptodate(page); | ||
1441 | SetPageError(page); | ||
1442 | } | ||
1443 | |||
1444 | unlock_extent(tree, start, end, GFP_ATOMIC); | ||
1445 | |||
1446 | } while (bvec >= bio->bi_io_vec); | ||
1447 | |||
1448 | bio_put(bio); | ||
1449 | #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,23) | ||
1450 | return 0; | ||
1451 | #endif | ||
1452 | } | ||
1453 | |||
1454 | static struct bio * | ||
1455 | extent_bio_alloc(struct block_device *bdev, u64 first_sector, int nr_vecs, | ||
1456 | gfp_t gfp_flags) | ||
1457 | { | ||
1458 | struct bio *bio; | ||
1459 | |||
1460 | bio = bio_alloc(gfp_flags, nr_vecs); | ||
1461 | |||
1462 | if (bio == NULL && (current->flags & PF_MEMALLOC)) { | ||
1463 | while (!bio && (nr_vecs /= 2)) | ||
1464 | bio = bio_alloc(gfp_flags, nr_vecs); | ||
1465 | } | ||
1466 | |||
1467 | if (bio) { | ||
1468 | bio->bi_bdev = bdev; | ||
1469 | bio->bi_sector = first_sector; | ||
1470 | } | ||
1471 | return bio; | ||
1472 | } | ||
1473 | |||
1474 | static int submit_one_bio(int rw, struct bio *bio) | ||
1475 | { | ||
1476 | u64 maxsector; | ||
1477 | int ret = 0; | ||
1478 | |||
1479 | bio_get(bio); | ||
1480 | |||
1481 | maxsector = bio->bi_bdev->bd_inode->i_size >> 9; | ||
1482 | if (maxsector < bio->bi_sector) { | ||
1483 | printk("sector too large max %Lu got %llu\n", maxsector, | ||
1484 | (unsigned long long)bio->bi_sector); | ||
1485 | WARN_ON(1); | ||
1486 | } | ||
1487 | |||
1488 | submit_bio(rw, bio); | ||
1489 | if (bio_flagged(bio, BIO_EOPNOTSUPP)) | ||
1490 | ret = -EOPNOTSUPP; | ||
1491 | bio_put(bio); | ||
1492 | return ret; | ||
1493 | } | ||
1494 | |||
1495 | static int submit_extent_page(int rw, struct extent_io_tree *tree, | ||
1496 | struct page *page, sector_t sector, | ||
1497 | size_t size, unsigned long offset, | ||
1498 | struct block_device *bdev, | ||
1499 | struct bio **bio_ret, | ||
1500 | unsigned long max_pages, | ||
1501 | bio_end_io_t end_io_func) | ||
1502 | { | ||
1503 | int ret = 0; | ||
1504 | struct bio *bio; | ||
1505 | int nr; | ||
1506 | |||
1507 | if (bio_ret && *bio_ret) { | ||
1508 | bio = *bio_ret; | ||
1509 | if (bio->bi_sector + (bio->bi_size >> 9) != sector || | ||
1510 | bio_add_page(bio, page, size, offset) < size) { | ||
1511 | ret = submit_one_bio(rw, bio); | ||
1512 | bio = NULL; | ||
1513 | } else { | ||
1514 | return 0; | ||
1515 | } | ||
1516 | } | ||
1517 | nr = min_t(int, max_pages, bio_get_nr_vecs(bdev)); | ||
1518 | bio = extent_bio_alloc(bdev, sector, nr, GFP_NOFS | __GFP_HIGH); | ||
1519 | if (!bio) { | ||
1520 | printk("failed to allocate bio nr %d\n", nr); | ||
1521 | } | ||
1522 | bio_add_page(bio, page, size, offset); | ||
1523 | bio->bi_end_io = end_io_func; | ||
1524 | bio->bi_private = tree; | ||
1525 | if (bio_ret) { | ||
1526 | *bio_ret = bio; | ||
1527 | } else { | ||
1528 | ret = submit_one_bio(rw, bio); | ||
1529 | } | ||
1530 | |||
1531 | return ret; | ||
1532 | } | ||
1533 | |||
1534 | void set_page_extent_mapped(struct page *page) | ||
1535 | { | ||
1536 | if (!PagePrivate(page)) { | ||
1537 | SetPagePrivate(page); | ||
1538 | WARN_ON(!page->mapping->a_ops->invalidatepage); | ||
1539 | set_page_private(page, EXTENT_PAGE_PRIVATE); | ||
1540 | page_cache_get(page); | ||
1541 | } | ||
1542 | } | ||
1543 | |||
1544 | void set_page_extent_head(struct page *page, unsigned long len) | ||
1545 | { | ||
1546 | set_page_private(page, EXTENT_PAGE_PRIVATE_FIRST_PAGE | len << 2); | ||
1547 | } | ||
1548 | |||
1549 | /* | ||
1550 | * basic readpage implementation. Locked extent state structs are inserted | ||
1551 | * into the tree that are removed when the IO is done (by the end_io | ||
1552 | * handlers) | ||
1553 | */ | ||
1554 | static int __extent_read_full_page(struct extent_io_tree *tree, | ||
1555 | struct page *page, | ||
1556 | get_extent_t *get_extent, | ||
1557 | struct bio **bio) | ||
1558 | { | ||
1559 | struct inode *inode = page->mapping->host; | ||
1560 | u64 start = (u64)page->index << PAGE_CACHE_SHIFT; | ||
1561 | u64 page_end = start + PAGE_CACHE_SIZE - 1; | ||
1562 | u64 end; | ||
1563 | u64 cur = start; | ||
1564 | u64 extent_offset; | ||
1565 | u64 last_byte = i_size_read(inode); | ||
1566 | u64 block_start; | ||
1567 | u64 cur_end; | ||
1568 | sector_t sector; | ||
1569 | struct extent_map *em; | ||
1570 | struct block_device *bdev; | ||
1571 | int ret; | ||
1572 | int nr = 0; | ||
1573 | size_t page_offset = 0; | ||
1574 | size_t iosize; | ||
1575 | size_t blocksize = inode->i_sb->s_blocksize; | ||
1576 | |||
1577 | set_page_extent_mapped(page); | ||
1578 | |||
1579 | end = page_end; | ||
1580 | lock_extent(tree, start, end, GFP_NOFS); | ||
1581 | |||
1582 | while (cur <= end) { | ||
1583 | if (cur >= last_byte) { | ||
1584 | char *userpage; | ||
1585 | iosize = PAGE_CACHE_SIZE - page_offset; | ||
1586 | userpage = kmap_atomic(page, KM_USER0); | ||
1587 | memset(userpage + page_offset, 0, iosize); | ||
1588 | flush_dcache_page(page); | ||
1589 | kunmap_atomic(userpage, KM_USER0); | ||
1590 | set_extent_uptodate(tree, cur, cur + iosize - 1, | ||
1591 | GFP_NOFS); | ||
1592 | unlock_extent(tree, cur, cur + iosize - 1, GFP_NOFS); | ||
1593 | break; | ||
1594 | } | ||
1595 | em = get_extent(inode, page, page_offset, cur, | ||
1596 | end - cur + 1, 0); | ||
1597 | if (IS_ERR(em) || !em) { | ||
1598 | SetPageError(page); | ||
1599 | unlock_extent(tree, cur, end, GFP_NOFS); | ||
1600 | break; | ||
1601 | } | ||
1602 | |||
1603 | extent_offset = cur - em->start; | ||
1604 | BUG_ON(extent_map_end(em) <= cur); | ||
1605 | BUG_ON(end < cur); | ||
1606 | |||
1607 | iosize = min(extent_map_end(em) - cur, end - cur + 1); | ||
1608 | cur_end = min(extent_map_end(em) - 1, end); | ||
1609 | iosize = (iosize + blocksize - 1) & ~((u64)blocksize - 1); | ||
1610 | sector = (em->block_start + extent_offset) >> 9; | ||
1611 | bdev = em->bdev; | ||
1612 | block_start = em->block_start; | ||
1613 | free_extent_map(em); | ||
1614 | em = NULL; | ||
1615 | |||
1616 | /* we've found a hole, just zero and go on */ | ||
1617 | if (block_start == EXTENT_MAP_HOLE) { | ||
1618 | char *userpage; | ||
1619 | userpage = kmap_atomic(page, KM_USER0); | ||
1620 | memset(userpage + page_offset, 0, iosize); | ||
1621 | flush_dcache_page(page); | ||
1622 | kunmap_atomic(userpage, KM_USER0); | ||
1623 | |||
1624 | set_extent_uptodate(tree, cur, cur + iosize - 1, | ||
1625 | GFP_NOFS); | ||
1626 | unlock_extent(tree, cur, cur + iosize - 1, GFP_NOFS); | ||
1627 | cur = cur + iosize; | ||
1628 | page_offset += iosize; | ||
1629 | continue; | ||
1630 | } | ||
1631 | /* the get_extent function already copied into the page */ | ||
1632 | if (test_range_bit(tree, cur, cur_end, EXTENT_UPTODATE, 1)) { | ||
1633 | unlock_extent(tree, cur, cur + iosize - 1, GFP_NOFS); | ||
1634 | cur = cur + iosize; | ||
1635 | page_offset += iosize; | ||
1636 | continue; | ||
1637 | } | ||
1638 | |||
1639 | ret = 0; | ||
1640 | if (tree->ops && tree->ops->readpage_io_hook) { | ||
1641 | ret = tree->ops->readpage_io_hook(page, cur, | ||
1642 | cur + iosize - 1); | ||
1643 | } | ||
1644 | if (!ret) { | ||
1645 | unsigned long nr = (last_byte >> PAGE_CACHE_SHIFT) + 1; | ||
1646 | nr -= page->index; | ||
1647 | ret = submit_extent_page(READ, tree, page, | ||
1648 | sector, iosize, page_offset, | ||
1649 | bdev, bio, nr, | ||
1650 | end_bio_extent_readpage); | ||
1651 | } | ||
1652 | if (ret) | ||
1653 | SetPageError(page); | ||
1654 | cur = cur + iosize; | ||
1655 | page_offset += iosize; | ||
1656 | nr++; | ||
1657 | } | ||
1658 | if (!nr) { | ||
1659 | if (!PageError(page)) | ||
1660 | SetPageUptodate(page); | ||
1661 | unlock_page(page); | ||
1662 | } | ||
1663 | return 0; | ||
1664 | } | ||
1665 | |||
1666 | int extent_read_full_page(struct extent_io_tree *tree, struct page *page, | ||
1667 | get_extent_t *get_extent) | ||
1668 | { | ||
1669 | struct bio *bio = NULL; | ||
1670 | int ret; | ||
1671 | |||
1672 | ret = __extent_read_full_page(tree, page, get_extent, &bio); | ||
1673 | if (bio) | ||
1674 | submit_one_bio(READ, bio); | ||
1675 | return ret; | ||
1676 | } | ||
1677 | EXPORT_SYMBOL(extent_read_full_page); | ||
1678 | |||
1679 | /* | ||
1680 | * the writepage semantics are similar to regular writepage. extent | ||
1681 | * records are inserted to lock ranges in the tree, and as dirty areas | ||
1682 | * are found, they are marked writeback. Then the lock bits are removed | ||
1683 | * and the end_io handler clears the writeback ranges | ||
1684 | */ | ||
1685 | static int __extent_writepage(struct page *page, struct writeback_control *wbc, | ||
1686 | void *data) | ||
1687 | { | ||
1688 | struct inode *inode = page->mapping->host; | ||
1689 | struct extent_page_data *epd = data; | ||
1690 | struct extent_io_tree *tree = epd->tree; | ||
1691 | u64 start = (u64)page->index << PAGE_CACHE_SHIFT; | ||
1692 | u64 delalloc_start; | ||
1693 | u64 page_end = start + PAGE_CACHE_SIZE - 1; | ||
1694 | u64 end; | ||
1695 | u64 cur = start; | ||
1696 | u64 extent_offset; | ||
1697 | u64 last_byte = i_size_read(inode); | ||
1698 | u64 block_start; | ||
1699 | u64 iosize; | ||
1700 | sector_t sector; | ||
1701 | struct extent_map *em; | ||
1702 | struct block_device *bdev; | ||
1703 | int ret; | ||
1704 | int nr = 0; | ||
1705 | size_t page_offset = 0; | ||
1706 | size_t blocksize; | ||
1707 | loff_t i_size = i_size_read(inode); | ||
1708 | unsigned long end_index = i_size >> PAGE_CACHE_SHIFT; | ||
1709 | u64 nr_delalloc; | ||
1710 | u64 delalloc_end; | ||
1711 | |||
1712 | WARN_ON(!PageLocked(page)); | ||
1713 | if (page->index > end_index) { | ||
1714 | clear_extent_dirty(tree, start, page_end, GFP_NOFS); | ||
1715 | unlock_page(page); | ||
1716 | return 0; | ||
1717 | } | ||
1718 | |||
1719 | if (page->index == end_index) { | ||
1720 | char *userpage; | ||
1721 | |||
1722 | size_t offset = i_size & (PAGE_CACHE_SIZE - 1); | ||
1723 | |||
1724 | userpage = kmap_atomic(page, KM_USER0); | ||
1725 | memset(userpage + offset, 0, PAGE_CACHE_SIZE - offset); | ||
1726 | flush_dcache_page(page); | ||
1727 | kunmap_atomic(userpage, KM_USER0); | ||
1728 | } | ||
1729 | |||
1730 | set_page_extent_mapped(page); | ||
1731 | |||
1732 | delalloc_start = start; | ||
1733 | delalloc_end = 0; | ||
1734 | while(delalloc_end < page_end) { | ||
1735 | nr_delalloc = find_lock_delalloc_range(tree, &delalloc_start, | ||
1736 | &delalloc_end, | ||
1737 | 128 * 1024 * 1024); | ||
1738 | if (nr_delalloc == 0) { | ||
1739 | delalloc_start = delalloc_end + 1; | ||
1740 | continue; | ||
1741 | } | ||
1742 | tree->ops->fill_delalloc(inode, delalloc_start, | ||
1743 | delalloc_end); | ||
1744 | clear_extent_bit(tree, delalloc_start, | ||
1745 | delalloc_end, | ||
1746 | EXTENT_LOCKED | EXTENT_DELALLOC, | ||
1747 | 1, 0, GFP_NOFS); | ||
1748 | delalloc_start = delalloc_end + 1; | ||
1749 | } | ||
1750 | lock_extent(tree, start, page_end, GFP_NOFS); | ||
1751 | |||
1752 | end = page_end; | ||
1753 | if (test_range_bit(tree, start, page_end, EXTENT_DELALLOC, 0)) { | ||
1754 | printk("found delalloc bits after lock_extent\n"); | ||
1755 | } | ||
1756 | |||
1757 | if (last_byte <= start) { | ||
1758 | clear_extent_dirty(tree, start, page_end, GFP_NOFS); | ||
1759 | goto done; | ||
1760 | } | ||
1761 | |||
1762 | set_extent_uptodate(tree, start, page_end, GFP_NOFS); | ||
1763 | blocksize = inode->i_sb->s_blocksize; | ||
1764 | |||
1765 | while (cur <= end) { | ||
1766 | if (cur >= last_byte) { | ||
1767 | clear_extent_dirty(tree, cur, page_end, GFP_NOFS); | ||
1768 | break; | ||
1769 | } | ||
1770 | em = epd->get_extent(inode, page, page_offset, cur, | ||
1771 | end - cur + 1, 1); | ||
1772 | if (IS_ERR(em) || !em) { | ||
1773 | SetPageError(page); | ||
1774 | break; | ||
1775 | } | ||
1776 | |||
1777 | extent_offset = cur - em->start; | ||
1778 | BUG_ON(extent_map_end(em) <= cur); | ||
1779 | BUG_ON(end < cur); | ||
1780 | iosize = min(extent_map_end(em) - cur, end - cur + 1); | ||
1781 | iosize = (iosize + blocksize - 1) & ~((u64)blocksize - 1); | ||
1782 | sector = (em->block_start + extent_offset) >> 9; | ||
1783 | bdev = em->bdev; | ||
1784 | block_start = em->block_start; | ||
1785 | free_extent_map(em); | ||
1786 | em = NULL; | ||
1787 | |||
1788 | if (block_start == EXTENT_MAP_HOLE || | ||
1789 | block_start == EXTENT_MAP_INLINE) { | ||
1790 | clear_extent_dirty(tree, cur, | ||
1791 | cur + iosize - 1, GFP_NOFS); | ||
1792 | cur = cur + iosize; | ||
1793 | page_offset += iosize; | ||
1794 | continue; | ||
1795 | } | ||
1796 | |||
1797 | /* leave this out until we have a page_mkwrite call */ | ||
1798 | if (0 && !test_range_bit(tree, cur, cur + iosize - 1, | ||
1799 | EXTENT_DIRTY, 0)) { | ||
1800 | cur = cur + iosize; | ||
1801 | page_offset += iosize; | ||
1802 | continue; | ||
1803 | } | ||
1804 | clear_extent_dirty(tree, cur, cur + iosize - 1, GFP_NOFS); | ||
1805 | if (tree->ops && tree->ops->writepage_io_hook) { | ||
1806 | ret = tree->ops->writepage_io_hook(page, cur, | ||
1807 | cur + iosize - 1); | ||
1808 | } else { | ||
1809 | ret = 0; | ||
1810 | } | ||
1811 | if (ret) | ||
1812 | SetPageError(page); | ||
1813 | else { | ||
1814 | unsigned long max_nr = end_index + 1; | ||
1815 | set_range_writeback(tree, cur, cur + iosize - 1); | ||
1816 | if (!PageWriteback(page)) { | ||
1817 | printk("warning page %lu not writeback, " | ||
1818 | "cur %llu end %llu\n", page->index, | ||
1819 | (unsigned long long)cur, | ||
1820 | (unsigned long long)end); | ||
1821 | } | ||
1822 | |||
1823 | ret = submit_extent_page(WRITE, tree, page, sector, | ||
1824 | iosize, page_offset, bdev, | ||
1825 | &epd->bio, max_nr, | ||
1826 | end_bio_extent_writepage); | ||
1827 | if (ret) | ||
1828 | SetPageError(page); | ||
1829 | } | ||
1830 | cur = cur + iosize; | ||
1831 | page_offset += iosize; | ||
1832 | nr++; | ||
1833 | } | ||
1834 | done: | ||
1835 | if (nr == 0) { | ||
1836 | /* make sure the mapping tag for page dirty gets cleared */ | ||
1837 | set_page_writeback(page); | ||
1838 | end_page_writeback(page); | ||
1839 | } | ||
1840 | unlock_extent(tree, start, page_end, GFP_NOFS); | ||
1841 | unlock_page(page); | ||
1842 | return 0; | ||
1843 | } | ||
1844 | |||
1845 | #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18) | ||
1846 | |||
1847 | /* Taken directly from 2.6.23 for 2.6.18 back port */ | ||
1848 | typedef int (*writepage_t)(struct page *page, struct writeback_control *wbc, | ||
1849 | void *data); | ||
1850 | |||
1851 | /** | ||
1852 | * write_cache_pages - walk the list of dirty pages of the given address space | ||
1853 | * and write all of them. | ||
1854 | * @mapping: address space structure to write | ||
1855 | * @wbc: subtract the number of written pages from *@wbc->nr_to_write | ||
1856 | * @writepage: function called for each page | ||
1857 | * @data: data passed to writepage function | ||
1858 | * | ||
1859 | * If a page is already under I/O, write_cache_pages() skips it, even | ||
1860 | * if it's dirty. This is desirable behaviour for memory-cleaning writeback, | ||
1861 | * but it is INCORRECT for data-integrity system calls such as fsync(). fsync() | ||
1862 | * and msync() need to guarantee that all the data which was dirty at the time | ||
1863 | * the call was made get new I/O started against them. If wbc->sync_mode is | ||
1864 | * WB_SYNC_ALL then we were called for data integrity and we must wait for | ||
1865 | * existing IO to complete. | ||
1866 | */ | ||
1867 | static int write_cache_pages(struct address_space *mapping, | ||
1868 | struct writeback_control *wbc, writepage_t writepage, | ||
1869 | void *data) | ||
1870 | { | ||
1871 | struct backing_dev_info *bdi = mapping->backing_dev_info; | ||
1872 | int ret = 0; | ||
1873 | int done = 0; | ||
1874 | struct pagevec pvec; | ||
1875 | int nr_pages; | ||
1876 | pgoff_t index; | ||
1877 | pgoff_t end; /* Inclusive */ | ||
1878 | int scanned = 0; | ||
1879 | int range_whole = 0; | ||
1880 | |||
1881 | if (wbc->nonblocking && bdi_write_congested(bdi)) { | ||
1882 | wbc->encountered_congestion = 1; | ||
1883 | return 0; | ||
1884 | } | ||
1885 | |||
1886 | pagevec_init(&pvec, 0); | ||
1887 | if (wbc->range_cyclic) { | ||
1888 | index = mapping->writeback_index; /* Start from prev offset */ | ||
1889 | end = -1; | ||
1890 | } else { | ||
1891 | index = wbc->range_start >> PAGE_CACHE_SHIFT; | ||
1892 | end = wbc->range_end >> PAGE_CACHE_SHIFT; | ||
1893 | if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX) | ||
1894 | range_whole = 1; | ||
1895 | scanned = 1; | ||
1896 | } | ||
1897 | retry: | ||
1898 | while (!done && (index <= end) && | ||
1899 | (nr_pages = pagevec_lookup_tag(&pvec, mapping, &index, | ||
1900 | PAGECACHE_TAG_DIRTY, | ||
1901 | min(end - index, (pgoff_t)PAGEVEC_SIZE-1) + 1))) { | ||
1902 | unsigned i; | ||
1903 | |||
1904 | scanned = 1; | ||
1905 | for (i = 0; i < nr_pages; i++) { | ||
1906 | struct page *page = pvec.pages[i]; | ||
1907 | |||
1908 | /* | ||
1909 | * At this point we hold neither mapping->tree_lock nor | ||
1910 | * lock on the page itself: the page may be truncated or | ||
1911 | * invalidated (changing page->mapping to NULL), or even | ||
1912 | * swizzled back from swapper_space to tmpfs file | ||
1913 | * mapping | ||
1914 | */ | ||
1915 | lock_page(page); | ||
1916 | |||
1917 | if (unlikely(page->mapping != mapping)) { | ||
1918 | unlock_page(page); | ||
1919 | continue; | ||
1920 | } | ||
1921 | |||
1922 | if (!wbc->range_cyclic && page->index > end) { | ||
1923 | done = 1; | ||
1924 | unlock_page(page); | ||
1925 | continue; | ||
1926 | } | ||
1927 | |||
1928 | if (wbc->sync_mode != WB_SYNC_NONE) | ||
1929 | wait_on_page_writeback(page); | ||
1930 | |||
1931 | if (PageWriteback(page) || | ||
1932 | !clear_page_dirty_for_io(page)) { | ||
1933 | unlock_page(page); | ||
1934 | continue; | ||
1935 | } | ||
1936 | |||
1937 | ret = (*writepage)(page, wbc, data); | ||
1938 | |||
1939 | if (unlikely(ret == AOP_WRITEPAGE_ACTIVATE)) { | ||
1940 | unlock_page(page); | ||
1941 | ret = 0; | ||
1942 | } | ||
1943 | if (ret || (--(wbc->nr_to_write) <= 0)) | ||
1944 | done = 1; | ||
1945 | if (wbc->nonblocking && bdi_write_congested(bdi)) { | ||
1946 | wbc->encountered_congestion = 1; | ||
1947 | done = 1; | ||
1948 | } | ||
1949 | } | ||
1950 | pagevec_release(&pvec); | ||
1951 | cond_resched(); | ||
1952 | } | ||
1953 | if (!scanned && !done) { | ||
1954 | /* | ||
1955 | * We hit the last page and there is more work to be done: wrap | ||
1956 | * back to the start of the file | ||
1957 | */ | ||
1958 | scanned = 1; | ||
1959 | index = 0; | ||
1960 | goto retry; | ||
1961 | } | ||
1962 | if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0)) | ||
1963 | mapping->writeback_index = index; | ||
1964 | return ret; | ||
1965 | } | ||
1966 | #endif | ||
1967 | |||
1968 | int extent_write_full_page(struct extent_io_tree *tree, struct page *page, | ||
1969 | get_extent_t *get_extent, | ||
1970 | struct writeback_control *wbc) | ||
1971 | { | ||
1972 | int ret; | ||
1973 | struct address_space *mapping = page->mapping; | ||
1974 | struct extent_page_data epd = { | ||
1975 | .bio = NULL, | ||
1976 | .tree = tree, | ||
1977 | .get_extent = get_extent, | ||
1978 | }; | ||
1979 | struct writeback_control wbc_writepages = { | ||
1980 | .bdi = wbc->bdi, | ||
1981 | .sync_mode = WB_SYNC_NONE, | ||
1982 | .older_than_this = NULL, | ||
1983 | .nr_to_write = 64, | ||
1984 | .range_start = page_offset(page) + PAGE_CACHE_SIZE, | ||
1985 | .range_end = (loff_t)-1, | ||
1986 | }; | ||
1987 | |||
1988 | |||
1989 | ret = __extent_writepage(page, wbc, &epd); | ||
1990 | |||
1991 | write_cache_pages(mapping, &wbc_writepages, __extent_writepage, &epd); | ||
1992 | if (epd.bio) { | ||
1993 | submit_one_bio(WRITE, epd.bio); | ||
1994 | } | ||
1995 | return ret; | ||
1996 | } | ||
1997 | EXPORT_SYMBOL(extent_write_full_page); | ||
1998 | |||
1999 | |||
2000 | int extent_writepages(struct extent_io_tree *tree, | ||
2001 | struct address_space *mapping, | ||
2002 | get_extent_t *get_extent, | ||
2003 | struct writeback_control *wbc) | ||
2004 | { | ||
2005 | int ret = 0; | ||
2006 | struct extent_page_data epd = { | ||
2007 | .bio = NULL, | ||
2008 | .tree = tree, | ||
2009 | .get_extent = get_extent, | ||
2010 | }; | ||
2011 | |||
2012 | ret = write_cache_pages(mapping, wbc, __extent_writepage, &epd); | ||
2013 | if (epd.bio) { | ||
2014 | submit_one_bio(WRITE, epd.bio); | ||
2015 | } | ||
2016 | return ret; | ||
2017 | } | ||
2018 | EXPORT_SYMBOL(extent_writepages); | ||
2019 | |||
2020 | int extent_readpages(struct extent_io_tree *tree, | ||
2021 | struct address_space *mapping, | ||
2022 | struct list_head *pages, unsigned nr_pages, | ||
2023 | get_extent_t get_extent) | ||
2024 | { | ||
2025 | struct bio *bio = NULL; | ||
2026 | unsigned page_idx; | ||
2027 | struct pagevec pvec; | ||
2028 | |||
2029 | pagevec_init(&pvec, 0); | ||
2030 | for (page_idx = 0; page_idx < nr_pages; page_idx++) { | ||
2031 | struct page *page = list_entry(pages->prev, struct page, lru); | ||
2032 | |||
2033 | prefetchw(&page->flags); | ||
2034 | list_del(&page->lru); | ||
2035 | /* | ||
2036 | * what we want to do here is call add_to_page_cache_lru, | ||
2037 | * but that isn't exported, so we reproduce it here | ||
2038 | */ | ||
2039 | if (!add_to_page_cache(page, mapping, | ||
2040 | page->index, GFP_KERNEL)) { | ||
2041 | |||
2042 | /* open coding of lru_cache_add, also not exported */ | ||
2043 | page_cache_get(page); | ||
2044 | if (!pagevec_add(&pvec, page)) | ||
2045 | __pagevec_lru_add(&pvec); | ||
2046 | __extent_read_full_page(tree, page, get_extent, &bio); | ||
2047 | } | ||
2048 | page_cache_release(page); | ||
2049 | } | ||
2050 | if (pagevec_count(&pvec)) | ||
2051 | __pagevec_lru_add(&pvec); | ||
2052 | BUG_ON(!list_empty(pages)); | ||
2053 | if (bio) | ||
2054 | submit_one_bio(READ, bio); | ||
2055 | return 0; | ||
2056 | } | ||
2057 | EXPORT_SYMBOL(extent_readpages); | ||
2058 | |||
2059 | /* | ||
2060 | * basic invalidatepage code, this waits on any locked or writeback | ||
2061 | * ranges corresponding to the page, and then deletes any extent state | ||
2062 | * records from the tree | ||
2063 | */ | ||
2064 | int extent_invalidatepage(struct extent_io_tree *tree, | ||
2065 | struct page *page, unsigned long offset) | ||
2066 | { | ||
2067 | u64 start = ((u64)page->index << PAGE_CACHE_SHIFT); | ||
2068 | u64 end = start + PAGE_CACHE_SIZE - 1; | ||
2069 | size_t blocksize = page->mapping->host->i_sb->s_blocksize; | ||
2070 | |||
2071 | start += (offset + blocksize -1) & ~(blocksize - 1); | ||
2072 | if (start > end) | ||
2073 | return 0; | ||
2074 | |||
2075 | lock_extent(tree, start, end, GFP_NOFS); | ||
2076 | wait_on_extent_writeback(tree, start, end); | ||
2077 | clear_extent_bit(tree, start, end, | ||
2078 | EXTENT_LOCKED | EXTENT_DIRTY | EXTENT_DELALLOC, | ||
2079 | 1, 1, GFP_NOFS); | ||
2080 | return 0; | ||
2081 | } | ||
2082 | EXPORT_SYMBOL(extent_invalidatepage); | ||
2083 | |||
2084 | /* | ||
2085 | * simple commit_write call, set_range_dirty is used to mark both | ||
2086 | * the pages and the extent records as dirty | ||
2087 | */ | ||
2088 | int extent_commit_write(struct extent_io_tree *tree, | ||
2089 | struct inode *inode, struct page *page, | ||
2090 | unsigned from, unsigned to) | ||
2091 | { | ||
2092 | loff_t pos = ((loff_t)page->index << PAGE_CACHE_SHIFT) + to; | ||
2093 | |||
2094 | set_page_extent_mapped(page); | ||
2095 | set_page_dirty(page); | ||
2096 | |||
2097 | if (pos > inode->i_size) { | ||
2098 | i_size_write(inode, pos); | ||
2099 | mark_inode_dirty(inode); | ||
2100 | } | ||
2101 | return 0; | ||
2102 | } | ||
2103 | EXPORT_SYMBOL(extent_commit_write); | ||
2104 | |||
2105 | int extent_prepare_write(struct extent_io_tree *tree, | ||
2106 | struct inode *inode, struct page *page, | ||
2107 | unsigned from, unsigned to, get_extent_t *get_extent) | ||
2108 | { | ||
2109 | u64 page_start = (u64)page->index << PAGE_CACHE_SHIFT; | ||
2110 | u64 page_end = page_start + PAGE_CACHE_SIZE - 1; | ||
2111 | u64 block_start; | ||
2112 | u64 orig_block_start; | ||
2113 | u64 block_end; | ||
2114 | u64 cur_end; | ||
2115 | struct extent_map *em; | ||
2116 | unsigned blocksize = 1 << inode->i_blkbits; | ||
2117 | size_t page_offset = 0; | ||
2118 | size_t block_off_start; | ||
2119 | size_t block_off_end; | ||
2120 | int err = 0; | ||
2121 | int iocount = 0; | ||
2122 | int ret = 0; | ||
2123 | int isnew; | ||
2124 | |||
2125 | set_page_extent_mapped(page); | ||
2126 | |||
2127 | block_start = (page_start + from) & ~((u64)blocksize - 1); | ||
2128 | block_end = (page_start + to - 1) | (blocksize - 1); | ||
2129 | orig_block_start = block_start; | ||
2130 | |||
2131 | lock_extent(tree, page_start, page_end, GFP_NOFS); | ||
2132 | while(block_start <= block_end) { | ||
2133 | em = get_extent(inode, page, page_offset, block_start, | ||
2134 | block_end - block_start + 1, 1); | ||
2135 | if (IS_ERR(em) || !em) { | ||
2136 | goto err; | ||
2137 | } | ||
2138 | cur_end = min(block_end, extent_map_end(em) - 1); | ||
2139 | block_off_start = block_start & (PAGE_CACHE_SIZE - 1); | ||
2140 | block_off_end = block_off_start + blocksize; | ||
2141 | isnew = clear_extent_new(tree, block_start, cur_end, GFP_NOFS); | ||
2142 | |||
2143 | if (!PageUptodate(page) && isnew && | ||
2144 | (block_off_end > to || block_off_start < from)) { | ||
2145 | void *kaddr; | ||
2146 | |||
2147 | kaddr = kmap_atomic(page, KM_USER0); | ||
2148 | if (block_off_end > to) | ||
2149 | memset(kaddr + to, 0, block_off_end - to); | ||
2150 | if (block_off_start < from) | ||
2151 | memset(kaddr + block_off_start, 0, | ||
2152 | from - block_off_start); | ||
2153 | flush_dcache_page(page); | ||
2154 | kunmap_atomic(kaddr, KM_USER0); | ||
2155 | } | ||
2156 | if ((em->block_start != EXTENT_MAP_HOLE && | ||
2157 | em->block_start != EXTENT_MAP_INLINE) && | ||
2158 | !isnew && !PageUptodate(page) && | ||
2159 | (block_off_end > to || block_off_start < from) && | ||
2160 | !test_range_bit(tree, block_start, cur_end, | ||
2161 | EXTENT_UPTODATE, 1)) { | ||
2162 | u64 sector; | ||
2163 | u64 extent_offset = block_start - em->start; | ||
2164 | size_t iosize; | ||
2165 | sector = (em->block_start + extent_offset) >> 9; | ||
2166 | iosize = (cur_end - block_start + blocksize) & | ||
2167 | ~((u64)blocksize - 1); | ||
2168 | /* | ||
2169 | * we've already got the extent locked, but we | ||
2170 | * need to split the state such that our end_bio | ||
2171 | * handler can clear the lock. | ||
2172 | */ | ||
2173 | set_extent_bit(tree, block_start, | ||
2174 | block_start + iosize - 1, | ||
2175 | EXTENT_LOCKED, 0, NULL, GFP_NOFS); | ||
2176 | ret = submit_extent_page(READ, tree, page, | ||
2177 | sector, iosize, page_offset, em->bdev, | ||
2178 | NULL, 1, | ||
2179 | end_bio_extent_preparewrite); | ||
2180 | iocount++; | ||
2181 | block_start = block_start + iosize; | ||
2182 | } else { | ||
2183 | set_extent_uptodate(tree, block_start, cur_end, | ||
2184 | GFP_NOFS); | ||
2185 | unlock_extent(tree, block_start, cur_end, GFP_NOFS); | ||
2186 | block_start = cur_end + 1; | ||
2187 | } | ||
2188 | page_offset = block_start & (PAGE_CACHE_SIZE - 1); | ||
2189 | free_extent_map(em); | ||
2190 | } | ||
2191 | if (iocount) { | ||
2192 | wait_extent_bit(tree, orig_block_start, | ||
2193 | block_end, EXTENT_LOCKED); | ||
2194 | } | ||
2195 | check_page_uptodate(tree, page); | ||
2196 | err: | ||
2197 | /* FIXME, zero out newly allocated blocks on error */ | ||
2198 | return err; | ||
2199 | } | ||
2200 | EXPORT_SYMBOL(extent_prepare_write); | ||
2201 | |||
2202 | /* | ||
2203 | * a helper for releasepage. As long as there are no locked extents | ||
2204 | * in the range corresponding to the page, both state records and extent | ||
2205 | * map records are removed | ||
2206 | */ | ||
2207 | int try_release_extent_mapping(struct extent_map_tree *map, | ||
2208 | struct extent_io_tree *tree, struct page *page) | ||
2209 | { | ||
2210 | struct extent_map *em; | ||
2211 | u64 start = (u64)page->index << PAGE_CACHE_SHIFT; | ||
2212 | u64 end = start + PAGE_CACHE_SIZE - 1; | ||
2213 | u64 orig_start = start; | ||
2214 | int ret = 1; | ||
2215 | |||
2216 | while (start <= end) { | ||
2217 | spin_lock(&map->lock); | ||
2218 | em = lookup_extent_mapping(map, start, end); | ||
2219 | if (!em || IS_ERR(em)) { | ||
2220 | spin_unlock(&map->lock); | ||
2221 | break; | ||
2222 | } | ||
2223 | if (!test_range_bit(tree, em->start, extent_map_end(em) - 1, | ||
2224 | EXTENT_LOCKED, 0)) { | ||
2225 | remove_extent_mapping(map, em); | ||
2226 | /* once for the rb tree */ | ||
2227 | free_extent_map(em); | ||
2228 | } | ||
2229 | start = extent_map_end(em); | ||
2230 | spin_unlock(&map->lock); | ||
2231 | |||
2232 | /* once for us */ | ||
2233 | free_extent_map(em); | ||
2234 | } | ||
2235 | if (test_range_bit(tree, orig_start, end, EXTENT_LOCKED, 0)) | ||
2236 | ret = 0; | ||
2237 | else | ||
2238 | clear_extent_bit(tree, orig_start, end, EXTENT_UPTODATE, | ||
2239 | 1, 1, GFP_NOFS); | ||
2240 | return ret; | ||
2241 | } | ||
2242 | EXPORT_SYMBOL(try_release_extent_mapping); | ||
2243 | |||
2244 | sector_t extent_bmap(struct address_space *mapping, sector_t iblock, | ||
2245 | get_extent_t *get_extent) | ||
2246 | { | ||
2247 | struct inode *inode = mapping->host; | ||
2248 | u64 start = iblock << inode->i_blkbits; | ||
2249 | sector_t sector = 0; | ||
2250 | struct extent_map *em; | ||
2251 | |||
2252 | em = get_extent(inode, NULL, 0, start, (1 << inode->i_blkbits), 0); | ||
2253 | if (!em || IS_ERR(em)) | ||
2254 | return 0; | ||
2255 | |||
2256 | if (em->block_start == EXTENT_MAP_INLINE || | ||
2257 | em->block_start == EXTENT_MAP_HOLE) | ||
2258 | goto out; | ||
2259 | |||
2260 | sector = (em->block_start + start - em->start) >> inode->i_blkbits; | ||
2261 | printk("bmap finds %Lu %Lu block %Lu\n", em->start, em->len, em->block_start); | ||
2262 | out: | ||
2263 | free_extent_map(em); | ||
2264 | return sector; | ||
2265 | } | ||
2266 | |||
2267 | static int add_lru(struct extent_io_tree *tree, struct extent_buffer *eb) | ||
2268 | { | ||
2269 | if (list_empty(&eb->lru)) { | ||
2270 | extent_buffer_get(eb); | ||
2271 | list_add(&eb->lru, &tree->buffer_lru); | ||
2272 | tree->lru_size++; | ||
2273 | if (tree->lru_size >= BUFFER_LRU_MAX) { | ||
2274 | struct extent_buffer *rm; | ||
2275 | rm = list_entry(tree->buffer_lru.prev, | ||
2276 | struct extent_buffer, lru); | ||
2277 | tree->lru_size--; | ||
2278 | list_del_init(&rm->lru); | ||
2279 | free_extent_buffer(rm); | ||
2280 | } | ||
2281 | } else | ||
2282 | list_move(&eb->lru, &tree->buffer_lru); | ||
2283 | return 0; | ||
2284 | } | ||
2285 | static struct extent_buffer *find_lru(struct extent_io_tree *tree, | ||
2286 | u64 start, unsigned long len) | ||
2287 | { | ||
2288 | struct list_head *lru = &tree->buffer_lru; | ||
2289 | struct list_head *cur = lru->next; | ||
2290 | struct extent_buffer *eb; | ||
2291 | |||
2292 | if (list_empty(lru)) | ||
2293 | return NULL; | ||
2294 | |||
2295 | do { | ||
2296 | eb = list_entry(cur, struct extent_buffer, lru); | ||
2297 | if (eb->start == start && eb->len == len) { | ||
2298 | extent_buffer_get(eb); | ||
2299 | return eb; | ||
2300 | } | ||
2301 | cur = cur->next; | ||
2302 | } while (cur != lru); | ||
2303 | return NULL; | ||
2304 | } | ||
2305 | |||
2306 | static inline unsigned long num_extent_pages(u64 start, u64 len) | ||
2307 | { | ||
2308 | return ((start + len + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT) - | ||
2309 | (start >> PAGE_CACHE_SHIFT); | ||
2310 | } | ||
2311 | |||
2312 | static inline struct page *extent_buffer_page(struct extent_buffer *eb, | ||
2313 | unsigned long i) | ||
2314 | { | ||
2315 | struct page *p; | ||
2316 | struct address_space *mapping; | ||
2317 | |||
2318 | if (i == 0) | ||
2319 | return eb->first_page; | ||
2320 | i += eb->start >> PAGE_CACHE_SHIFT; | ||
2321 | mapping = eb->first_page->mapping; | ||
2322 | read_lock_irq(&mapping->tree_lock); | ||
2323 | p = radix_tree_lookup(&mapping->page_tree, i); | ||
2324 | read_unlock_irq(&mapping->tree_lock); | ||
2325 | return p; | ||
2326 | } | ||
2327 | |||
2328 | static struct extent_buffer *__alloc_extent_buffer(struct extent_io_tree *tree, | ||
2329 | u64 start, | ||
2330 | unsigned long len, | ||
2331 | gfp_t mask) | ||
2332 | { | ||
2333 | struct extent_buffer *eb = NULL; | ||
2334 | |||
2335 | spin_lock(&tree->lru_lock); | ||
2336 | eb = find_lru(tree, start, len); | ||
2337 | spin_unlock(&tree->lru_lock); | ||
2338 | if (eb) { | ||
2339 | return eb; | ||
2340 | } | ||
2341 | |||
2342 | eb = kmem_cache_zalloc(extent_buffer_cache, mask); | ||
2343 | INIT_LIST_HEAD(&eb->lru); | ||
2344 | eb->start = start; | ||
2345 | eb->len = len; | ||
2346 | atomic_set(&eb->refs, 1); | ||
2347 | |||
2348 | return eb; | ||
2349 | } | ||
2350 | |||
2351 | static void __free_extent_buffer(struct extent_buffer *eb) | ||
2352 | { | ||
2353 | kmem_cache_free(extent_buffer_cache, eb); | ||
2354 | } | ||
2355 | |||
2356 | struct extent_buffer *alloc_extent_buffer(struct extent_io_tree *tree, | ||
2357 | u64 start, unsigned long len, | ||
2358 | struct page *page0, | ||
2359 | gfp_t mask) | ||
2360 | { | ||
2361 | unsigned long num_pages = num_extent_pages(start, len); | ||
2362 | unsigned long i; | ||
2363 | unsigned long index = start >> PAGE_CACHE_SHIFT; | ||
2364 | struct extent_buffer *eb; | ||
2365 | struct page *p; | ||
2366 | struct address_space *mapping = tree->mapping; | ||
2367 | int uptodate = 1; | ||
2368 | |||
2369 | eb = __alloc_extent_buffer(tree, start, len, mask); | ||
2370 | if (!eb || IS_ERR(eb)) | ||
2371 | return NULL; | ||
2372 | |||
2373 | if (eb->flags & EXTENT_BUFFER_FILLED) | ||
2374 | goto lru_add; | ||
2375 | |||
2376 | if (page0) { | ||
2377 | eb->first_page = page0; | ||
2378 | i = 1; | ||
2379 | index++; | ||
2380 | page_cache_get(page0); | ||
2381 | mark_page_accessed(page0); | ||
2382 | set_page_extent_mapped(page0); | ||
2383 | WARN_ON(!PageUptodate(page0)); | ||
2384 | set_page_extent_head(page0, len); | ||
2385 | } else { | ||
2386 | i = 0; | ||
2387 | } | ||
2388 | for (; i < num_pages; i++, index++) { | ||
2389 | p = find_or_create_page(mapping, index, mask | __GFP_HIGHMEM); | ||
2390 | if (!p) { | ||
2391 | WARN_ON(1); | ||
2392 | goto fail; | ||
2393 | } | ||
2394 | set_page_extent_mapped(p); | ||
2395 | mark_page_accessed(p); | ||
2396 | if (i == 0) { | ||
2397 | eb->first_page = p; | ||
2398 | set_page_extent_head(p, len); | ||
2399 | } else { | ||
2400 | set_page_private(p, EXTENT_PAGE_PRIVATE); | ||
2401 | } | ||
2402 | if (!PageUptodate(p)) | ||
2403 | uptodate = 0; | ||
2404 | unlock_page(p); | ||
2405 | } | ||
2406 | if (uptodate) | ||
2407 | eb->flags |= EXTENT_UPTODATE; | ||
2408 | eb->flags |= EXTENT_BUFFER_FILLED; | ||
2409 | |||
2410 | lru_add: | ||
2411 | spin_lock(&tree->lru_lock); | ||
2412 | add_lru(tree, eb); | ||
2413 | spin_unlock(&tree->lru_lock); | ||
2414 | return eb; | ||
2415 | |||
2416 | fail: | ||
2417 | spin_lock(&tree->lru_lock); | ||
2418 | list_del_init(&eb->lru); | ||
2419 | spin_unlock(&tree->lru_lock); | ||
2420 | if (!atomic_dec_and_test(&eb->refs)) | ||
2421 | return NULL; | ||
2422 | for (index = 1; index < i; index++) { | ||
2423 | page_cache_release(extent_buffer_page(eb, index)); | ||
2424 | } | ||
2425 | if (i > 0) | ||
2426 | page_cache_release(extent_buffer_page(eb, 0)); | ||
2427 | __free_extent_buffer(eb); | ||
2428 | return NULL; | ||
2429 | } | ||
2430 | EXPORT_SYMBOL(alloc_extent_buffer); | ||
2431 | |||
2432 | struct extent_buffer *find_extent_buffer(struct extent_io_tree *tree, | ||
2433 | u64 start, unsigned long len, | ||
2434 | gfp_t mask) | ||
2435 | { | ||
2436 | unsigned long num_pages = num_extent_pages(start, len); | ||
2437 | unsigned long i; | ||
2438 | unsigned long index = start >> PAGE_CACHE_SHIFT; | ||
2439 | struct extent_buffer *eb; | ||
2440 | struct page *p; | ||
2441 | struct address_space *mapping = tree->mapping; | ||
2442 | int uptodate = 1; | ||
2443 | |||
2444 | eb = __alloc_extent_buffer(tree, start, len, mask); | ||
2445 | if (!eb || IS_ERR(eb)) | ||
2446 | return NULL; | ||
2447 | |||
2448 | if (eb->flags & EXTENT_BUFFER_FILLED) | ||
2449 | goto lru_add; | ||
2450 | |||
2451 | for (i = 0; i < num_pages; i++, index++) { | ||
2452 | p = find_lock_page(mapping, index); | ||
2453 | if (!p) { | ||
2454 | goto fail; | ||
2455 | } | ||
2456 | set_page_extent_mapped(p); | ||
2457 | mark_page_accessed(p); | ||
2458 | |||
2459 | if (i == 0) { | ||
2460 | eb->first_page = p; | ||
2461 | set_page_extent_head(p, len); | ||
2462 | } else { | ||
2463 | set_page_private(p, EXTENT_PAGE_PRIVATE); | ||
2464 | } | ||
2465 | |||
2466 | if (!PageUptodate(p)) | ||
2467 | uptodate = 0; | ||
2468 | unlock_page(p); | ||
2469 | } | ||
2470 | if (uptodate) | ||
2471 | eb->flags |= EXTENT_UPTODATE; | ||
2472 | eb->flags |= EXTENT_BUFFER_FILLED; | ||
2473 | |||
2474 | lru_add: | ||
2475 | spin_lock(&tree->lru_lock); | ||
2476 | add_lru(tree, eb); | ||
2477 | spin_unlock(&tree->lru_lock); | ||
2478 | return eb; | ||
2479 | fail: | ||
2480 | spin_lock(&tree->lru_lock); | ||
2481 | list_del_init(&eb->lru); | ||
2482 | spin_unlock(&tree->lru_lock); | ||
2483 | if (!atomic_dec_and_test(&eb->refs)) | ||
2484 | return NULL; | ||
2485 | for (index = 1; index < i; index++) { | ||
2486 | page_cache_release(extent_buffer_page(eb, index)); | ||
2487 | } | ||
2488 | if (i > 0) | ||
2489 | page_cache_release(extent_buffer_page(eb, 0)); | ||
2490 | __free_extent_buffer(eb); | ||
2491 | return NULL; | ||
2492 | } | ||
2493 | EXPORT_SYMBOL(find_extent_buffer); | ||
2494 | |||
2495 | void free_extent_buffer(struct extent_buffer *eb) | ||
2496 | { | ||
2497 | unsigned long i; | ||
2498 | unsigned long num_pages; | ||
2499 | |||
2500 | if (!eb) | ||
2501 | return; | ||
2502 | |||
2503 | if (!atomic_dec_and_test(&eb->refs)) | ||
2504 | return; | ||
2505 | |||
2506 | WARN_ON(!list_empty(&eb->lru)); | ||
2507 | num_pages = num_extent_pages(eb->start, eb->len); | ||
2508 | |||
2509 | for (i = 1; i < num_pages; i++) { | ||
2510 | page_cache_release(extent_buffer_page(eb, i)); | ||
2511 | } | ||
2512 | page_cache_release(extent_buffer_page(eb, 0)); | ||
2513 | __free_extent_buffer(eb); | ||
2514 | } | ||
2515 | EXPORT_SYMBOL(free_extent_buffer); | ||
2516 | |||
2517 | int clear_extent_buffer_dirty(struct extent_io_tree *tree, | ||
2518 | struct extent_buffer *eb) | ||
2519 | { | ||
2520 | int set; | ||
2521 | unsigned long i; | ||
2522 | unsigned long num_pages; | ||
2523 | struct page *page; | ||
2524 | |||
2525 | u64 start = eb->start; | ||
2526 | u64 end = start + eb->len - 1; | ||
2527 | |||
2528 | set = clear_extent_dirty(tree, start, end, GFP_NOFS); | ||
2529 | num_pages = num_extent_pages(eb->start, eb->len); | ||
2530 | |||
2531 | for (i = 0; i < num_pages; i++) { | ||
2532 | page = extent_buffer_page(eb, i); | ||
2533 | lock_page(page); | ||
2534 | if (i == 0) | ||
2535 | set_page_extent_head(page, eb->len); | ||
2536 | else | ||
2537 | set_page_private(page, EXTENT_PAGE_PRIVATE); | ||
2538 | |||
2539 | /* | ||
2540 | * if we're on the last page or the first page and the | ||
2541 | * block isn't aligned on a page boundary, do extra checks | ||
2542 | * to make sure we don't clean page that is partially dirty | ||
2543 | */ | ||
2544 | if ((i == 0 && (eb->start & (PAGE_CACHE_SIZE - 1))) || | ||
2545 | ((i == num_pages - 1) && | ||
2546 | ((eb->start + eb->len) & (PAGE_CACHE_SIZE - 1)))) { | ||
2547 | start = (u64)page->index << PAGE_CACHE_SHIFT; | ||
2548 | end = start + PAGE_CACHE_SIZE - 1; | ||
2549 | if (test_range_bit(tree, start, end, | ||
2550 | EXTENT_DIRTY, 0)) { | ||
2551 | unlock_page(page); | ||
2552 | continue; | ||
2553 | } | ||
2554 | } | ||
2555 | clear_page_dirty_for_io(page); | ||
2556 | write_lock_irq(&page->mapping->tree_lock); | ||
2557 | if (!PageDirty(page)) { | ||
2558 | radix_tree_tag_clear(&page->mapping->page_tree, | ||
2559 | page_index(page), | ||
2560 | PAGECACHE_TAG_DIRTY); | ||
2561 | } | ||
2562 | write_unlock_irq(&page->mapping->tree_lock); | ||
2563 | unlock_page(page); | ||
2564 | } | ||
2565 | return 0; | ||
2566 | } | ||
2567 | EXPORT_SYMBOL(clear_extent_buffer_dirty); | ||
2568 | |||
2569 | int wait_on_extent_buffer_writeback(struct extent_io_tree *tree, | ||
2570 | struct extent_buffer *eb) | ||
2571 | { | ||
2572 | return wait_on_extent_writeback(tree, eb->start, | ||
2573 | eb->start + eb->len - 1); | ||
2574 | } | ||
2575 | EXPORT_SYMBOL(wait_on_extent_buffer_writeback); | ||
2576 | |||
2577 | int set_extent_buffer_dirty(struct extent_io_tree *tree, | ||
2578 | struct extent_buffer *eb) | ||
2579 | { | ||
2580 | unsigned long i; | ||
2581 | unsigned long num_pages; | ||
2582 | |||
2583 | num_pages = num_extent_pages(eb->start, eb->len); | ||
2584 | for (i = 0; i < num_pages; i++) { | ||
2585 | struct page *page = extent_buffer_page(eb, i); | ||
2586 | /* writepage may need to do something special for the | ||
2587 | * first page, we have to make sure page->private is | ||
2588 | * properly set. releasepage may drop page->private | ||
2589 | * on us if the page isn't already dirty. | ||
2590 | */ | ||
2591 | if (i == 0) { | ||
2592 | lock_page(page); | ||
2593 | set_page_extent_head(page, eb->len); | ||
2594 | } else if (PagePrivate(page) && | ||
2595 | page->private != EXTENT_PAGE_PRIVATE) { | ||
2596 | lock_page(page); | ||
2597 | set_page_extent_mapped(page); | ||
2598 | unlock_page(page); | ||
2599 | } | ||
2600 | __set_page_dirty_nobuffers(extent_buffer_page(eb, i)); | ||
2601 | if (i == 0) | ||
2602 | unlock_page(page); | ||
2603 | } | ||
2604 | return set_extent_dirty(tree, eb->start, | ||
2605 | eb->start + eb->len - 1, GFP_NOFS); | ||
2606 | } | ||
2607 | EXPORT_SYMBOL(set_extent_buffer_dirty); | ||
2608 | |||
2609 | int set_extent_buffer_uptodate(struct extent_io_tree *tree, | ||
2610 | struct extent_buffer *eb) | ||
2611 | { | ||
2612 | unsigned long i; | ||
2613 | struct page *page; | ||
2614 | unsigned long num_pages; | ||
2615 | |||
2616 | num_pages = num_extent_pages(eb->start, eb->len); | ||
2617 | |||
2618 | set_extent_uptodate(tree, eb->start, eb->start + eb->len - 1, | ||
2619 | GFP_NOFS); | ||
2620 | for (i = 0; i < num_pages; i++) { | ||
2621 | page = extent_buffer_page(eb, i); | ||
2622 | if ((i == 0 && (eb->start & (PAGE_CACHE_SIZE - 1))) || | ||
2623 | ((i == num_pages - 1) && | ||
2624 | ((eb->start + eb->len) & (PAGE_CACHE_SIZE - 1)))) { | ||
2625 | check_page_uptodate(tree, page); | ||
2626 | continue; | ||
2627 | } | ||
2628 | SetPageUptodate(page); | ||
2629 | } | ||
2630 | return 0; | ||
2631 | } | ||
2632 | EXPORT_SYMBOL(set_extent_buffer_uptodate); | ||
2633 | |||
2634 | int extent_buffer_uptodate(struct extent_io_tree *tree, | ||
2635 | struct extent_buffer *eb) | ||
2636 | { | ||
2637 | if (eb->flags & EXTENT_UPTODATE) | ||
2638 | return 1; | ||
2639 | return test_range_bit(tree, eb->start, eb->start + eb->len - 1, | ||
2640 | EXTENT_UPTODATE, 1); | ||
2641 | } | ||
2642 | EXPORT_SYMBOL(extent_buffer_uptodate); | ||
2643 | |||
2644 | int read_extent_buffer_pages(struct extent_io_tree *tree, | ||
2645 | struct extent_buffer *eb, | ||
2646 | u64 start, | ||
2647 | int wait) | ||
2648 | { | ||
2649 | unsigned long i; | ||
2650 | unsigned long start_i; | ||
2651 | struct page *page; | ||
2652 | int err; | ||
2653 | int ret = 0; | ||
2654 | unsigned long num_pages; | ||
2655 | |||
2656 | if (eb->flags & EXTENT_UPTODATE) | ||
2657 | return 0; | ||
2658 | |||
2659 | if (0 && test_range_bit(tree, eb->start, eb->start + eb->len - 1, | ||
2660 | EXTENT_UPTODATE, 1)) { | ||
2661 | return 0; | ||
2662 | } | ||
2663 | |||
2664 | if (start) { | ||
2665 | WARN_ON(start < eb->start); | ||
2666 | start_i = (start >> PAGE_CACHE_SHIFT) - | ||
2667 | (eb->start >> PAGE_CACHE_SHIFT); | ||
2668 | } else { | ||
2669 | start_i = 0; | ||
2670 | } | ||
2671 | |||
2672 | num_pages = num_extent_pages(eb->start, eb->len); | ||
2673 | for (i = start_i; i < num_pages; i++) { | ||
2674 | page = extent_buffer_page(eb, i); | ||
2675 | if (PageUptodate(page)) { | ||
2676 | continue; | ||
2677 | } | ||
2678 | if (!wait) { | ||
2679 | if (TestSetPageLocked(page)) { | ||
2680 | continue; | ||
2681 | } | ||
2682 | } else { | ||
2683 | lock_page(page); | ||
2684 | } | ||
2685 | if (!PageUptodate(page)) { | ||
2686 | err = page->mapping->a_ops->readpage(NULL, page); | ||
2687 | if (err) { | ||
2688 | ret = err; | ||
2689 | } | ||
2690 | } else { | ||
2691 | unlock_page(page); | ||
2692 | } | ||
2693 | } | ||
2694 | |||
2695 | if (ret || !wait) { | ||
2696 | return ret; | ||
2697 | } | ||
2698 | |||
2699 | for (i = start_i; i < num_pages; i++) { | ||
2700 | page = extent_buffer_page(eb, i); | ||
2701 | wait_on_page_locked(page); | ||
2702 | if (!PageUptodate(page)) { | ||
2703 | ret = -EIO; | ||
2704 | } | ||
2705 | } | ||
2706 | if (!ret) | ||
2707 | eb->flags |= EXTENT_UPTODATE; | ||
2708 | return ret; | ||
2709 | } | ||
2710 | EXPORT_SYMBOL(read_extent_buffer_pages); | ||
2711 | |||
2712 | void read_extent_buffer(struct extent_buffer *eb, void *dstv, | ||
2713 | unsigned long start, | ||
2714 | unsigned long len) | ||
2715 | { | ||
2716 | size_t cur; | ||
2717 | size_t offset; | ||
2718 | struct page *page; | ||
2719 | char *kaddr; | ||
2720 | char *dst = (char *)dstv; | ||
2721 | size_t start_offset = eb->start & ((u64)PAGE_CACHE_SIZE - 1); | ||
2722 | unsigned long i = (start_offset + start) >> PAGE_CACHE_SHIFT; | ||
2723 | unsigned long num_pages = num_extent_pages(eb->start, eb->len); | ||
2724 | |||
2725 | WARN_ON(start > eb->len); | ||
2726 | WARN_ON(start + len > eb->start + eb->len); | ||
2727 | |||
2728 | offset = (start_offset + start) & ((unsigned long)PAGE_CACHE_SIZE - 1); | ||
2729 | |||
2730 | while(len > 0) { | ||
2731 | page = extent_buffer_page(eb, i); | ||
2732 | if (!PageUptodate(page)) { | ||
2733 | printk("page %lu not up to date i %lu, total %lu, len %lu\n", page->index, i, num_pages, eb->len); | ||
2734 | WARN_ON(1); | ||
2735 | } | ||
2736 | WARN_ON(!PageUptodate(page)); | ||
2737 | |||
2738 | cur = min(len, (PAGE_CACHE_SIZE - offset)); | ||
2739 | kaddr = kmap_atomic(page, KM_USER1); | ||
2740 | memcpy(dst, kaddr + offset, cur); | ||
2741 | kunmap_atomic(kaddr, KM_USER1); | ||
2742 | |||
2743 | dst += cur; | ||
2744 | len -= cur; | ||
2745 | offset = 0; | ||
2746 | i++; | ||
2747 | } | ||
2748 | } | ||
2749 | EXPORT_SYMBOL(read_extent_buffer); | ||
2750 | |||
2751 | int map_private_extent_buffer(struct extent_buffer *eb, unsigned long start, | ||
2752 | unsigned long min_len, char **token, char **map, | ||
2753 | unsigned long *map_start, | ||
2754 | unsigned long *map_len, int km) | ||
2755 | { | ||
2756 | size_t offset = start & (PAGE_CACHE_SIZE - 1); | ||
2757 | char *kaddr; | ||
2758 | struct page *p; | ||
2759 | size_t start_offset = eb->start & ((u64)PAGE_CACHE_SIZE - 1); | ||
2760 | unsigned long i = (start_offset + start) >> PAGE_CACHE_SHIFT; | ||
2761 | unsigned long end_i = (start_offset + start + min_len - 1) >> | ||
2762 | PAGE_CACHE_SHIFT; | ||
2763 | |||
2764 | if (i != end_i) | ||
2765 | return -EINVAL; | ||
2766 | |||
2767 | if (i == 0) { | ||
2768 | offset = start_offset; | ||
2769 | *map_start = 0; | ||
2770 | } else { | ||
2771 | offset = 0; | ||
2772 | *map_start = ((u64)i << PAGE_CACHE_SHIFT) - start_offset; | ||
2773 | } | ||
2774 | if (start + min_len > eb->len) { | ||
2775 | printk("bad mapping eb start %Lu len %lu, wanted %lu %lu\n", eb->start, eb->len, start, min_len); | ||
2776 | WARN_ON(1); | ||
2777 | } | ||
2778 | |||
2779 | p = extent_buffer_page(eb, i); | ||
2780 | WARN_ON(!PageUptodate(p)); | ||
2781 | kaddr = kmap_atomic(p, km); | ||
2782 | *token = kaddr; | ||
2783 | *map = kaddr + offset; | ||
2784 | *map_len = PAGE_CACHE_SIZE - offset; | ||
2785 | return 0; | ||
2786 | } | ||
2787 | EXPORT_SYMBOL(map_private_extent_buffer); | ||
2788 | |||
2789 | int map_extent_buffer(struct extent_buffer *eb, unsigned long start, | ||
2790 | unsigned long min_len, | ||
2791 | char **token, char **map, | ||
2792 | unsigned long *map_start, | ||
2793 | unsigned long *map_len, int km) | ||
2794 | { | ||
2795 | int err; | ||
2796 | int save = 0; | ||
2797 | if (eb->map_token) { | ||
2798 | unmap_extent_buffer(eb, eb->map_token, km); | ||
2799 | eb->map_token = NULL; | ||
2800 | save = 1; | ||
2801 | } | ||
2802 | err = map_private_extent_buffer(eb, start, min_len, token, map, | ||
2803 | map_start, map_len, km); | ||
2804 | if (!err && save) { | ||
2805 | eb->map_token = *token; | ||
2806 | eb->kaddr = *map; | ||
2807 | eb->map_start = *map_start; | ||
2808 | eb->map_len = *map_len; | ||
2809 | } | ||
2810 | return err; | ||
2811 | } | ||
2812 | EXPORT_SYMBOL(map_extent_buffer); | ||
2813 | |||
2814 | void unmap_extent_buffer(struct extent_buffer *eb, char *token, int km) | ||
2815 | { | ||
2816 | kunmap_atomic(token, km); | ||
2817 | } | ||
2818 | EXPORT_SYMBOL(unmap_extent_buffer); | ||
2819 | |||
2820 | int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv, | ||
2821 | unsigned long start, | ||
2822 | unsigned long len) | ||
2823 | { | ||
2824 | size_t cur; | ||
2825 | size_t offset; | ||
2826 | struct page *page; | ||
2827 | char *kaddr; | ||
2828 | char *ptr = (char *)ptrv; | ||
2829 | size_t start_offset = eb->start & ((u64)PAGE_CACHE_SIZE - 1); | ||
2830 | unsigned long i = (start_offset + start) >> PAGE_CACHE_SHIFT; | ||
2831 | int ret = 0; | ||
2832 | |||
2833 | WARN_ON(start > eb->len); | ||
2834 | WARN_ON(start + len > eb->start + eb->len); | ||
2835 | |||
2836 | offset = (start_offset + start) & ((unsigned long)PAGE_CACHE_SIZE - 1); | ||
2837 | |||
2838 | while(len > 0) { | ||
2839 | page = extent_buffer_page(eb, i); | ||
2840 | WARN_ON(!PageUptodate(page)); | ||
2841 | |||
2842 | cur = min(len, (PAGE_CACHE_SIZE - offset)); | ||
2843 | |||
2844 | kaddr = kmap_atomic(page, KM_USER0); | ||
2845 | ret = memcmp(ptr, kaddr + offset, cur); | ||
2846 | kunmap_atomic(kaddr, KM_USER0); | ||
2847 | if (ret) | ||
2848 | break; | ||
2849 | |||
2850 | ptr += cur; | ||
2851 | len -= cur; | ||
2852 | offset = 0; | ||
2853 | i++; | ||
2854 | } | ||
2855 | return ret; | ||
2856 | } | ||
2857 | EXPORT_SYMBOL(memcmp_extent_buffer); | ||
2858 | |||
2859 | void write_extent_buffer(struct extent_buffer *eb, const void *srcv, | ||
2860 | unsigned long start, unsigned long len) | ||
2861 | { | ||
2862 | size_t cur; | ||
2863 | size_t offset; | ||
2864 | struct page *page; | ||
2865 | char *kaddr; | ||
2866 | char *src = (char *)srcv; | ||
2867 | size_t start_offset = eb->start & ((u64)PAGE_CACHE_SIZE - 1); | ||
2868 | unsigned long i = (start_offset + start) >> PAGE_CACHE_SHIFT; | ||
2869 | |||
2870 | WARN_ON(start > eb->len); | ||
2871 | WARN_ON(start + len > eb->start + eb->len); | ||
2872 | |||
2873 | offset = (start_offset + start) & ((unsigned long)PAGE_CACHE_SIZE - 1); | ||
2874 | |||
2875 | while(len > 0) { | ||
2876 | page = extent_buffer_page(eb, i); | ||
2877 | WARN_ON(!PageUptodate(page)); | ||
2878 | |||
2879 | cur = min(len, PAGE_CACHE_SIZE - offset); | ||
2880 | kaddr = kmap_atomic(page, KM_USER1); | ||
2881 | memcpy(kaddr + offset, src, cur); | ||
2882 | kunmap_atomic(kaddr, KM_USER1); | ||
2883 | |||
2884 | src += cur; | ||
2885 | len -= cur; | ||
2886 | offset = 0; | ||
2887 | i++; | ||
2888 | } | ||
2889 | } | ||
2890 | EXPORT_SYMBOL(write_extent_buffer); | ||
2891 | |||
2892 | void memset_extent_buffer(struct extent_buffer *eb, char c, | ||
2893 | unsigned long start, unsigned long len) | ||
2894 | { | ||
2895 | size_t cur; | ||
2896 | size_t offset; | ||
2897 | struct page *page; | ||
2898 | char *kaddr; | ||
2899 | size_t start_offset = eb->start & ((u64)PAGE_CACHE_SIZE - 1); | ||
2900 | unsigned long i = (start_offset + start) >> PAGE_CACHE_SHIFT; | ||
2901 | |||
2902 | WARN_ON(start > eb->len); | ||
2903 | WARN_ON(start + len > eb->start + eb->len); | ||
2904 | |||
2905 | offset = (start_offset + start) & ((unsigned long)PAGE_CACHE_SIZE - 1); | ||
2906 | |||
2907 | while(len > 0) { | ||
2908 | page = extent_buffer_page(eb, i); | ||
2909 | WARN_ON(!PageUptodate(page)); | ||
2910 | |||
2911 | cur = min(len, PAGE_CACHE_SIZE - offset); | ||
2912 | kaddr = kmap_atomic(page, KM_USER0); | ||
2913 | memset(kaddr + offset, c, cur); | ||
2914 | kunmap_atomic(kaddr, KM_USER0); | ||
2915 | |||
2916 | len -= cur; | ||
2917 | offset = 0; | ||
2918 | i++; | ||
2919 | } | ||
2920 | } | ||
2921 | EXPORT_SYMBOL(memset_extent_buffer); | ||
2922 | |||
2923 | void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src, | ||
2924 | unsigned long dst_offset, unsigned long src_offset, | ||
2925 | unsigned long len) | ||
2926 | { | ||
2927 | u64 dst_len = dst->len; | ||
2928 | size_t cur; | ||
2929 | size_t offset; | ||
2930 | struct page *page; | ||
2931 | char *kaddr; | ||
2932 | size_t start_offset = dst->start & ((u64)PAGE_CACHE_SIZE - 1); | ||
2933 | unsigned long i = (start_offset + dst_offset) >> PAGE_CACHE_SHIFT; | ||
2934 | |||
2935 | WARN_ON(src->len != dst_len); | ||
2936 | |||
2937 | offset = (start_offset + dst_offset) & | ||
2938 | ((unsigned long)PAGE_CACHE_SIZE - 1); | ||
2939 | |||
2940 | while(len > 0) { | ||
2941 | page = extent_buffer_page(dst, i); | ||
2942 | WARN_ON(!PageUptodate(page)); | ||
2943 | |||
2944 | cur = min(len, (unsigned long)(PAGE_CACHE_SIZE - offset)); | ||
2945 | |||
2946 | kaddr = kmap_atomic(page, KM_USER0); | ||
2947 | read_extent_buffer(src, kaddr + offset, src_offset, cur); | ||
2948 | kunmap_atomic(kaddr, KM_USER0); | ||
2949 | |||
2950 | src_offset += cur; | ||
2951 | len -= cur; | ||
2952 | offset = 0; | ||
2953 | i++; | ||
2954 | } | ||
2955 | } | ||
2956 | EXPORT_SYMBOL(copy_extent_buffer); | ||
2957 | |||
2958 | static void move_pages(struct page *dst_page, struct page *src_page, | ||
2959 | unsigned long dst_off, unsigned long src_off, | ||
2960 | unsigned long len) | ||
2961 | { | ||
2962 | char *dst_kaddr = kmap_atomic(dst_page, KM_USER0); | ||
2963 | if (dst_page == src_page) { | ||
2964 | memmove(dst_kaddr + dst_off, dst_kaddr + src_off, len); | ||
2965 | } else { | ||
2966 | char *src_kaddr = kmap_atomic(src_page, KM_USER1); | ||
2967 | char *p = dst_kaddr + dst_off + len; | ||
2968 | char *s = src_kaddr + src_off + len; | ||
2969 | |||
2970 | while (len--) | ||
2971 | *--p = *--s; | ||
2972 | |||
2973 | kunmap_atomic(src_kaddr, KM_USER1); | ||
2974 | } | ||
2975 | kunmap_atomic(dst_kaddr, KM_USER0); | ||
2976 | } | ||
2977 | |||
2978 | static void copy_pages(struct page *dst_page, struct page *src_page, | ||
2979 | unsigned long dst_off, unsigned long src_off, | ||
2980 | unsigned long len) | ||
2981 | { | ||
2982 | char *dst_kaddr = kmap_atomic(dst_page, KM_USER0); | ||
2983 | char *src_kaddr; | ||
2984 | |||
2985 | if (dst_page != src_page) | ||
2986 | src_kaddr = kmap_atomic(src_page, KM_USER1); | ||
2987 | else | ||
2988 | src_kaddr = dst_kaddr; | ||
2989 | |||
2990 | memcpy(dst_kaddr + dst_off, src_kaddr + src_off, len); | ||
2991 | kunmap_atomic(dst_kaddr, KM_USER0); | ||
2992 | if (dst_page != src_page) | ||
2993 | kunmap_atomic(src_kaddr, KM_USER1); | ||
2994 | } | ||
2995 | |||
2996 | void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset, | ||
2997 | unsigned long src_offset, unsigned long len) | ||
2998 | { | ||
2999 | size_t cur; | ||
3000 | size_t dst_off_in_page; | ||
3001 | size_t src_off_in_page; | ||
3002 | size_t start_offset = dst->start & ((u64)PAGE_CACHE_SIZE - 1); | ||
3003 | unsigned long dst_i; | ||
3004 | unsigned long src_i; | ||
3005 | |||
3006 | if (src_offset + len > dst->len) { | ||
3007 | printk("memmove bogus src_offset %lu move len %lu len %lu\n", | ||
3008 | src_offset, len, dst->len); | ||
3009 | BUG_ON(1); | ||
3010 | } | ||
3011 | if (dst_offset + len > dst->len) { | ||
3012 | printk("memmove bogus dst_offset %lu move len %lu len %lu\n", | ||
3013 | dst_offset, len, dst->len); | ||
3014 | BUG_ON(1); | ||
3015 | } | ||
3016 | |||
3017 | while(len > 0) { | ||
3018 | dst_off_in_page = (start_offset + dst_offset) & | ||
3019 | ((unsigned long)PAGE_CACHE_SIZE - 1); | ||
3020 | src_off_in_page = (start_offset + src_offset) & | ||
3021 | ((unsigned long)PAGE_CACHE_SIZE - 1); | ||
3022 | |||
3023 | dst_i = (start_offset + dst_offset) >> PAGE_CACHE_SHIFT; | ||
3024 | src_i = (start_offset + src_offset) >> PAGE_CACHE_SHIFT; | ||
3025 | |||
3026 | cur = min(len, (unsigned long)(PAGE_CACHE_SIZE - | ||
3027 | src_off_in_page)); | ||
3028 | cur = min_t(unsigned long, cur, | ||
3029 | (unsigned long)(PAGE_CACHE_SIZE - dst_off_in_page)); | ||
3030 | |||
3031 | copy_pages(extent_buffer_page(dst, dst_i), | ||
3032 | extent_buffer_page(dst, src_i), | ||
3033 | dst_off_in_page, src_off_in_page, cur); | ||
3034 | |||
3035 | src_offset += cur; | ||
3036 | dst_offset += cur; | ||
3037 | len -= cur; | ||
3038 | } | ||
3039 | } | ||
3040 | EXPORT_SYMBOL(memcpy_extent_buffer); | ||
3041 | |||
3042 | void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset, | ||
3043 | unsigned long src_offset, unsigned long len) | ||
3044 | { | ||
3045 | size_t cur; | ||
3046 | size_t dst_off_in_page; | ||
3047 | size_t src_off_in_page; | ||
3048 | unsigned long dst_end = dst_offset + len - 1; | ||
3049 | unsigned long src_end = src_offset + len - 1; | ||
3050 | size_t start_offset = dst->start & ((u64)PAGE_CACHE_SIZE - 1); | ||
3051 | unsigned long dst_i; | ||
3052 | unsigned long src_i; | ||
3053 | |||
3054 | if (src_offset + len > dst->len) { | ||
3055 | printk("memmove bogus src_offset %lu move len %lu len %lu\n", | ||
3056 | src_offset, len, dst->len); | ||
3057 | BUG_ON(1); | ||
3058 | } | ||
3059 | if (dst_offset + len > dst->len) { | ||
3060 | printk("memmove bogus dst_offset %lu move len %lu len %lu\n", | ||
3061 | dst_offset, len, dst->len); | ||
3062 | BUG_ON(1); | ||
3063 | } | ||
3064 | if (dst_offset < src_offset) { | ||
3065 | memcpy_extent_buffer(dst, dst_offset, src_offset, len); | ||
3066 | return; | ||
3067 | } | ||
3068 | while(len > 0) { | ||
3069 | dst_i = (start_offset + dst_end) >> PAGE_CACHE_SHIFT; | ||
3070 | src_i = (start_offset + src_end) >> PAGE_CACHE_SHIFT; | ||
3071 | |||
3072 | dst_off_in_page = (start_offset + dst_end) & | ||
3073 | ((unsigned long)PAGE_CACHE_SIZE - 1); | ||
3074 | src_off_in_page = (start_offset + src_end) & | ||
3075 | ((unsigned long)PAGE_CACHE_SIZE - 1); | ||
3076 | |||
3077 | cur = min_t(unsigned long, len, src_off_in_page + 1); | ||
3078 | cur = min(cur, dst_off_in_page + 1); | ||
3079 | move_pages(extent_buffer_page(dst, dst_i), | ||
3080 | extent_buffer_page(dst, src_i), | ||
3081 | dst_off_in_page - cur + 1, | ||
3082 | src_off_in_page - cur + 1, cur); | ||
3083 | |||
3084 | dst_end -= cur; | ||
3085 | src_end -= cur; | ||
3086 | len -= cur; | ||
3087 | } | ||
3088 | } | ||
3089 | EXPORT_SYMBOL(memmove_extent_buffer); | ||
diff --git a/fs/btrfs/extent_io.h b/fs/btrfs/extent_io.h new file mode 100644 index 000000000000..06be1fe84b29 --- /dev/null +++ b/fs/btrfs/extent_io.h | |||
@@ -0,0 +1,193 @@ | |||
1 | #ifndef __EXTENTIO__ | ||
2 | #define __EXTENTIO__ | ||
3 | |||
4 | #include <linux/rbtree.h> | ||
5 | |||
6 | /* bits for the extent state */ | ||
7 | #define EXTENT_DIRTY 1 | ||
8 | #define EXTENT_WRITEBACK (1 << 1) | ||
9 | #define EXTENT_UPTODATE (1 << 2) | ||
10 | #define EXTENT_LOCKED (1 << 3) | ||
11 | #define EXTENT_NEW (1 << 4) | ||
12 | #define EXTENT_DELALLOC (1 << 5) | ||
13 | #define EXTENT_DEFRAG (1 << 6) | ||
14 | #define EXTENT_DEFRAG_DONE (1 << 7) | ||
15 | #define EXTENT_BUFFER_FILLED (1 << 8) | ||
16 | #define EXTENT_CSUM (1 << 9) | ||
17 | #define EXTENT_IOBITS (EXTENT_LOCKED | EXTENT_WRITEBACK) | ||
18 | |||
19 | /* | ||
20 | * page->private values. Every page that is controlled by the extent | ||
21 | * map has page->private set to one. | ||
22 | */ | ||
23 | #define EXTENT_PAGE_PRIVATE 1 | ||
24 | #define EXTENT_PAGE_PRIVATE_FIRST_PAGE 3 | ||
25 | |||
26 | struct extent_io_ops { | ||
27 | int (*fill_delalloc)(struct inode *inode, u64 start, u64 end); | ||
28 | int (*writepage_io_hook)(struct page *page, u64 start, u64 end); | ||
29 | int (*readpage_io_hook)(struct page *page, u64 start, u64 end); | ||
30 | int (*readpage_end_io_hook)(struct page *page, u64 start, u64 end); | ||
31 | void (*writepage_end_io_hook)(struct page *page, u64 start, u64 end); | ||
32 | }; | ||
33 | |||
34 | struct extent_io_tree { | ||
35 | struct rb_root state; | ||
36 | struct address_space *mapping; | ||
37 | u64 dirty_bytes; | ||
38 | rwlock_t lock; | ||
39 | struct extent_io_ops *ops; | ||
40 | spinlock_t lru_lock; | ||
41 | struct list_head buffer_lru; | ||
42 | int lru_size; | ||
43 | }; | ||
44 | |||
45 | struct extent_state { | ||
46 | u64 start; | ||
47 | u64 end; /* inclusive */ | ||
48 | int in_tree; | ||
49 | struct rb_node rb_node; | ||
50 | wait_queue_head_t wq; | ||
51 | atomic_t refs; | ||
52 | unsigned long state; | ||
53 | |||
54 | /* for use by the FS */ | ||
55 | u64 private; | ||
56 | |||
57 | struct list_head list; | ||
58 | }; | ||
59 | |||
60 | struct extent_buffer { | ||
61 | u64 start; | ||
62 | unsigned long len; | ||
63 | char *map_token; | ||
64 | char *kaddr; | ||
65 | unsigned long map_start; | ||
66 | unsigned long map_len; | ||
67 | struct page *first_page; | ||
68 | struct list_head lru; | ||
69 | atomic_t refs; | ||
70 | int flags; | ||
71 | }; | ||
72 | |||
73 | struct extent_map_tree; | ||
74 | |||
75 | typedef struct extent_map *(get_extent_t)(struct inode *inode, | ||
76 | struct page *page, | ||
77 | size_t page_offset, | ||
78 | u64 start, u64 len, | ||
79 | int create); | ||
80 | |||
81 | void extent_io_tree_init(struct extent_io_tree *tree, | ||
82 | struct address_space *mapping, gfp_t mask); | ||
83 | void extent_io_tree_empty_lru(struct extent_io_tree *tree); | ||
84 | int try_release_extent_mapping(struct extent_map_tree *map, | ||
85 | struct extent_io_tree *tree, struct page *page); | ||
86 | int lock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask); | ||
87 | int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask); | ||
88 | int extent_read_full_page(struct extent_io_tree *tree, struct page *page, | ||
89 | get_extent_t *get_extent); | ||
90 | int __init extent_io_init(void); | ||
91 | void extent_io_exit(void); | ||
92 | |||
93 | u64 count_range_bits(struct extent_io_tree *tree, | ||
94 | u64 *start, u64 search_end, | ||
95 | u64 max_bytes, unsigned long bits); | ||
96 | |||
97 | int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end, | ||
98 | int bits, int filled); | ||
99 | int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end, | ||
100 | int bits, gfp_t mask); | ||
101 | int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end, | ||
102 | int bits, gfp_t mask); | ||
103 | int set_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end, | ||
104 | gfp_t mask); | ||
105 | int set_extent_new(struct extent_io_tree *tree, u64 start, u64 end, | ||
106 | gfp_t mask); | ||
107 | int set_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end, | ||
108 | gfp_t mask); | ||
109 | int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end, | ||
110 | gfp_t mask); | ||
111 | int set_extent_delalloc(struct extent_io_tree *tree, u64 start, u64 end, | ||
112 | gfp_t mask); | ||
113 | int find_first_extent_bit(struct extent_io_tree *tree, u64 start, | ||
114 | u64 *start_ret, u64 *end_ret, int bits); | ||
115 | int extent_invalidatepage(struct extent_io_tree *tree, | ||
116 | struct page *page, unsigned long offset); | ||
117 | int extent_write_full_page(struct extent_io_tree *tree, struct page *page, | ||
118 | get_extent_t *get_extent, | ||
119 | struct writeback_control *wbc); | ||
120 | int extent_writepages(struct extent_io_tree *tree, | ||
121 | struct address_space *mapping, | ||
122 | get_extent_t *get_extent, | ||
123 | struct writeback_control *wbc); | ||
124 | int extent_readpages(struct extent_io_tree *tree, | ||
125 | struct address_space *mapping, | ||
126 | struct list_head *pages, unsigned nr_pages, | ||
127 | get_extent_t get_extent); | ||
128 | int extent_prepare_write(struct extent_io_tree *tree, | ||
129 | struct inode *inode, struct page *page, | ||
130 | unsigned from, unsigned to, get_extent_t *get_extent); | ||
131 | int extent_commit_write(struct extent_io_tree *tree, | ||
132 | struct inode *inode, struct page *page, | ||
133 | unsigned from, unsigned to); | ||
134 | sector_t extent_bmap(struct address_space *mapping, sector_t iblock, | ||
135 | get_extent_t *get_extent); | ||
136 | int set_range_dirty(struct extent_io_tree *tree, u64 start, u64 end); | ||
137 | int set_state_private(struct extent_io_tree *tree, u64 start, u64 private); | ||
138 | int get_state_private(struct extent_io_tree *tree, u64 start, u64 *private); | ||
139 | void set_page_extent_mapped(struct page *page); | ||
140 | |||
141 | struct extent_buffer *alloc_extent_buffer(struct extent_io_tree *tree, | ||
142 | u64 start, unsigned long len, | ||
143 | struct page *page0, | ||
144 | gfp_t mask); | ||
145 | struct extent_buffer *find_extent_buffer(struct extent_io_tree *tree, | ||
146 | u64 start, unsigned long len, | ||
147 | gfp_t mask); | ||
148 | void free_extent_buffer(struct extent_buffer *eb); | ||
149 | int read_extent_buffer_pages(struct extent_io_tree *tree, | ||
150 | struct extent_buffer *eb, u64 start, int wait); | ||
151 | |||
152 | static inline void extent_buffer_get(struct extent_buffer *eb) | ||
153 | { | ||
154 | atomic_inc(&eb->refs); | ||
155 | } | ||
156 | |||
157 | int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv, | ||
158 | unsigned long start, | ||
159 | unsigned long len); | ||
160 | void read_extent_buffer(struct extent_buffer *eb, void *dst, | ||
161 | unsigned long start, | ||
162 | unsigned long len); | ||
163 | void write_extent_buffer(struct extent_buffer *eb, const void *src, | ||
164 | unsigned long start, unsigned long len); | ||
165 | void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src, | ||
166 | unsigned long dst_offset, unsigned long src_offset, | ||
167 | unsigned long len); | ||
168 | void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset, | ||
169 | unsigned long src_offset, unsigned long len); | ||
170 | void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset, | ||
171 | unsigned long src_offset, unsigned long len); | ||
172 | void memset_extent_buffer(struct extent_buffer *eb, char c, | ||
173 | unsigned long start, unsigned long len); | ||
174 | int wait_on_extent_buffer_writeback(struct extent_io_tree *tree, | ||
175 | struct extent_buffer *eb); | ||
176 | int clear_extent_buffer_dirty(struct extent_io_tree *tree, | ||
177 | struct extent_buffer *eb); | ||
178 | int set_extent_buffer_dirty(struct extent_io_tree *tree, | ||
179 | struct extent_buffer *eb); | ||
180 | int set_extent_buffer_uptodate(struct extent_io_tree *tree, | ||
181 | struct extent_buffer *eb); | ||
182 | int extent_buffer_uptodate(struct extent_io_tree *tree, | ||
183 | struct extent_buffer *eb); | ||
184 | int map_extent_buffer(struct extent_buffer *eb, unsigned long offset, | ||
185 | unsigned long min_len, char **token, char **map, | ||
186 | unsigned long *map_start, | ||
187 | unsigned long *map_len, int km); | ||
188 | int map_private_extent_buffer(struct extent_buffer *eb, unsigned long offset, | ||
189 | unsigned long min_len, char **token, char **map, | ||
190 | unsigned long *map_start, | ||
191 | unsigned long *map_len, int km); | ||
192 | void unmap_extent_buffer(struct extent_buffer *eb, char *token, int km); | ||
193 | #endif | ||
diff --git a/fs/btrfs/extent_map.c b/fs/btrfs/extent_map.c index 010a287fbd71..268ad8facf6e 100644 --- a/fs/btrfs/extent_map.c +++ b/fs/btrfs/extent_map.c | |||
@@ -1,17 +1,10 @@ | |||
1 | #include <linux/bitops.h> | 1 | #include <linux/err.h> |
2 | #include <linux/slab.h> | ||
3 | #include <linux/bio.h> | ||
4 | #include <linux/mm.h> | ||
5 | #include <linux/gfp.h> | 2 | #include <linux/gfp.h> |
6 | #include <linux/pagemap.h> | 3 | #include <linux/slab.h> |
7 | #include <linux/page-flags.h> | ||
8 | #include <linux/module.h> | 4 | #include <linux/module.h> |
9 | #include <linux/spinlock.h> | 5 | #include <linux/spinlock.h> |
10 | #include <linux/blkdev.h> | ||
11 | #include <linux/swap.h> | ||
12 | #include <linux/version.h> | 6 | #include <linux/version.h> |
13 | #include <linux/writeback.h> | 7 | #include <linux/hardirq.h> |
14 | #include <linux/pagevec.h> | ||
15 | #include "extent_map.h" | 8 | #include "extent_map.h" |
16 | 9 | ||
17 | /* temporary define until extent_map moves out of btrfs */ | 10 | /* temporary define until extent_map moves out of btrfs */ |
@@ -21,27 +14,6 @@ struct kmem_cache *btrfs_cache_create(const char *name, size_t size, | |||
21 | unsigned long)); | 14 | unsigned long)); |
22 | 15 | ||
23 | static struct kmem_cache *extent_map_cache; | 16 | static struct kmem_cache *extent_map_cache; |
24 | static struct kmem_cache *extent_state_cache; | ||
25 | static struct kmem_cache *extent_buffer_cache; | ||
26 | |||
27 | static LIST_HEAD(buffers); | ||
28 | static LIST_HEAD(states); | ||
29 | |||
30 | static spinlock_t state_lock = SPIN_LOCK_UNLOCKED; | ||
31 | #define BUFFER_LRU_MAX 64 | ||
32 | |||
33 | struct tree_entry { | ||
34 | u64 start; | ||
35 | u64 end; | ||
36 | int in_tree; | ||
37 | struct rb_node rb_node; | ||
38 | }; | ||
39 | |||
40 | struct extent_page_data { | ||
41 | struct bio *bio; | ||
42 | struct extent_map_tree *tree; | ||
43 | get_extent_t *get_extent; | ||
44 | }; | ||
45 | 17 | ||
46 | int __init extent_map_init(void) | 18 | int __init extent_map_init(void) |
47 | { | 19 | { |
@@ -50,72 +22,23 @@ int __init extent_map_init(void) | |||
50 | NULL); | 22 | NULL); |
51 | if (!extent_map_cache) | 23 | if (!extent_map_cache) |
52 | return -ENOMEM; | 24 | return -ENOMEM; |
53 | extent_state_cache = btrfs_cache_create("extent_state", | ||
54 | sizeof(struct extent_state), 0, | ||
55 | NULL); | ||
56 | if (!extent_state_cache) | ||
57 | goto free_map_cache; | ||
58 | extent_buffer_cache = btrfs_cache_create("extent_buffers", | ||
59 | sizeof(struct extent_buffer), 0, | ||
60 | NULL); | ||
61 | if (!extent_buffer_cache) | ||
62 | goto free_state_cache; | ||
63 | return 0; | 25 | return 0; |
64 | |||
65 | free_state_cache: | ||
66 | kmem_cache_destroy(extent_state_cache); | ||
67 | free_map_cache: | ||
68 | kmem_cache_destroy(extent_map_cache); | ||
69 | return -ENOMEM; | ||
70 | } | 26 | } |
71 | 27 | ||
72 | void extent_map_exit(void) | 28 | void extent_map_exit(void) |
73 | { | 29 | { |
74 | struct extent_state *state; | ||
75 | |||
76 | while (!list_empty(&states)) { | ||
77 | state = list_entry(states.next, struct extent_state, list); | ||
78 | printk("state leak: start %Lu end %Lu state %lu in tree %d refs %d\n", state->start, state->end, state->state, state->in_tree, atomic_read(&state->refs)); | ||
79 | list_del(&state->list); | ||
80 | kmem_cache_free(extent_state_cache, state); | ||
81 | |||
82 | } | ||
83 | |||
84 | if (extent_map_cache) | 30 | if (extent_map_cache) |
85 | kmem_cache_destroy(extent_map_cache); | 31 | kmem_cache_destroy(extent_map_cache); |
86 | if (extent_state_cache) | ||
87 | kmem_cache_destroy(extent_state_cache); | ||
88 | if (extent_buffer_cache) | ||
89 | kmem_cache_destroy(extent_buffer_cache); | ||
90 | } | 32 | } |
91 | 33 | ||
92 | void extent_map_tree_init(struct extent_map_tree *tree, | 34 | void extent_map_tree_init(struct extent_map_tree *tree, gfp_t mask) |
93 | struct address_space *mapping, gfp_t mask) | ||
94 | { | 35 | { |
95 | tree->map.rb_node = NULL; | 36 | tree->map.rb_node = NULL; |
96 | tree->state.rb_node = NULL; | 37 | tree->last = NULL; |
97 | tree->ops = NULL; | 38 | spin_lock_init(&tree->lock); |
98 | tree->dirty_bytes = 0; | ||
99 | rwlock_init(&tree->lock); | ||
100 | spin_lock_init(&tree->lru_lock); | ||
101 | tree->mapping = mapping; | ||
102 | INIT_LIST_HEAD(&tree->buffer_lru); | ||
103 | tree->lru_size = 0; | ||
104 | } | 39 | } |
105 | EXPORT_SYMBOL(extent_map_tree_init); | 40 | EXPORT_SYMBOL(extent_map_tree_init); |
106 | 41 | ||
107 | void extent_map_tree_empty_lru(struct extent_map_tree *tree) | ||
108 | { | ||
109 | struct extent_buffer *eb; | ||
110 | while(!list_empty(&tree->buffer_lru)) { | ||
111 | eb = list_entry(tree->buffer_lru.next, struct extent_buffer, | ||
112 | lru); | ||
113 | list_del_init(&eb->lru); | ||
114 | free_extent_buffer(eb); | ||
115 | } | ||
116 | } | ||
117 | EXPORT_SYMBOL(extent_map_tree_empty_lru); | ||
118 | |||
119 | struct extent_map *alloc_extent_map(gfp_t mask) | 42 | struct extent_map *alloc_extent_map(gfp_t mask) |
120 | { | 43 | { |
121 | struct extent_map *em; | 44 | struct extent_map *em; |
@@ -123,6 +46,7 @@ struct extent_map *alloc_extent_map(gfp_t mask) | |||
123 | if (!em || IS_ERR(em)) | 46 | if (!em || IS_ERR(em)) |
124 | return em; | 47 | return em; |
125 | em->in_tree = 0; | 48 | em->in_tree = 0; |
49 | em->flags = 0; | ||
126 | atomic_set(&em->refs, 1); | 50 | atomic_set(&em->refs, 1); |
127 | return em; | 51 | return em; |
128 | } | 52 | } |
@@ -132,6 +56,7 @@ void free_extent_map(struct extent_map *em) | |||
132 | { | 56 | { |
133 | if (!em) | 57 | if (!em) |
134 | return; | 58 | return; |
59 | WARN_ON(atomic_read(&em->refs) == 0); | ||
135 | if (atomic_dec_and_test(&em->refs)) { | 60 | if (atomic_dec_and_test(&em->refs)) { |
136 | WARN_ON(em->in_tree); | 61 | WARN_ON(em->in_tree); |
137 | kmem_cache_free(extent_map_cache, em); | 62 | kmem_cache_free(extent_map_cache, em); |
@@ -139,64 +64,28 @@ void free_extent_map(struct extent_map *em) | |||
139 | } | 64 | } |
140 | EXPORT_SYMBOL(free_extent_map); | 65 | EXPORT_SYMBOL(free_extent_map); |
141 | 66 | ||
142 | |||
143 | struct extent_state *alloc_extent_state(gfp_t mask) | ||
144 | { | ||
145 | struct extent_state *state; | ||
146 | unsigned long flags; | ||
147 | |||
148 | state = kmem_cache_alloc(extent_state_cache, mask); | ||
149 | if (!state || IS_ERR(state)) | ||
150 | return state; | ||
151 | state->state = 0; | ||
152 | state->in_tree = 0; | ||
153 | state->private = 0; | ||
154 | |||
155 | spin_lock_irqsave(&state_lock, flags); | ||
156 | list_add(&state->list, &states); | ||
157 | spin_unlock_irqrestore(&state_lock, flags); | ||
158 | |||
159 | atomic_set(&state->refs, 1); | ||
160 | init_waitqueue_head(&state->wq); | ||
161 | return state; | ||
162 | } | ||
163 | EXPORT_SYMBOL(alloc_extent_state); | ||
164 | |||
165 | void free_extent_state(struct extent_state *state) | ||
166 | { | ||
167 | unsigned long flags; | ||
168 | if (!state) | ||
169 | return; | ||
170 | if (atomic_dec_and_test(&state->refs)) { | ||
171 | WARN_ON(state->in_tree); | ||
172 | spin_lock_irqsave(&state_lock, flags); | ||
173 | list_del(&state->list); | ||
174 | spin_unlock_irqrestore(&state_lock, flags); | ||
175 | kmem_cache_free(extent_state_cache, state); | ||
176 | } | ||
177 | } | ||
178 | EXPORT_SYMBOL(free_extent_state); | ||
179 | |||
180 | static struct rb_node *tree_insert(struct rb_root *root, u64 offset, | 67 | static struct rb_node *tree_insert(struct rb_root *root, u64 offset, |
181 | struct rb_node *node) | 68 | struct rb_node *node) |
182 | { | 69 | { |
183 | struct rb_node ** p = &root->rb_node; | 70 | struct rb_node ** p = &root->rb_node; |
184 | struct rb_node * parent = NULL; | 71 | struct rb_node * parent = NULL; |
185 | struct tree_entry *entry; | 72 | struct extent_map *entry; |
186 | 73 | ||
187 | while(*p) { | 74 | while(*p) { |
188 | parent = *p; | 75 | parent = *p; |
189 | entry = rb_entry(parent, struct tree_entry, rb_node); | 76 | entry = rb_entry(parent, struct extent_map, rb_node); |
77 | |||
78 | WARN_ON(!entry->in_tree); | ||
190 | 79 | ||
191 | if (offset < entry->start) | 80 | if (offset < entry->start) |
192 | p = &(*p)->rb_left; | 81 | p = &(*p)->rb_left; |
193 | else if (offset > entry->end) | 82 | else if (offset >= extent_map_end(entry)) |
194 | p = &(*p)->rb_right; | 83 | p = &(*p)->rb_right; |
195 | else | 84 | else |
196 | return parent; | 85 | return parent; |
197 | } | 86 | } |
198 | 87 | ||
199 | entry = rb_entry(node, struct tree_entry, rb_node); | 88 | entry = rb_entry(node, struct extent_map, rb_node); |
200 | entry->in_tree = 1; | 89 | entry->in_tree = 1; |
201 | rb_link_node(node, parent, p); | 90 | rb_link_node(node, parent, p); |
202 | rb_insert_color(node, root); | 91 | rb_insert_color(node, root); |
@@ -210,17 +99,19 @@ static struct rb_node *__tree_search(struct rb_root *root, u64 offset, | |||
210 | struct rb_node * n = root->rb_node; | 99 | struct rb_node * n = root->rb_node; |
211 | struct rb_node *prev = NULL; | 100 | struct rb_node *prev = NULL; |
212 | struct rb_node *orig_prev = NULL; | 101 | struct rb_node *orig_prev = NULL; |
213 | struct tree_entry *entry; | 102 | struct extent_map *entry; |
214 | struct tree_entry *prev_entry = NULL; | 103 | struct extent_map *prev_entry = NULL; |
215 | 104 | ||
216 | while(n) { | 105 | while(n) { |
217 | entry = rb_entry(n, struct tree_entry, rb_node); | 106 | entry = rb_entry(n, struct extent_map, rb_node); |
218 | prev = n; | 107 | prev = n; |
219 | prev_entry = entry; | 108 | prev_entry = entry; |
220 | 109 | ||
110 | WARN_ON(!entry->in_tree); | ||
111 | |||
221 | if (offset < entry->start) | 112 | if (offset < entry->start) |
222 | n = n->rb_left; | 113 | n = n->rb_left; |
223 | else if (offset > entry->end) | 114 | else if (offset >= extent_map_end(entry)) |
224 | n = n->rb_right; | 115 | n = n->rb_right; |
225 | else | 116 | else |
226 | return n; | 117 | return n; |
@@ -228,19 +119,19 @@ static struct rb_node *__tree_search(struct rb_root *root, u64 offset, | |||
228 | 119 | ||
229 | if (prev_ret) { | 120 | if (prev_ret) { |
230 | orig_prev = prev; | 121 | orig_prev = prev; |
231 | while(prev && offset > prev_entry->end) { | 122 | while(prev && offset >= extent_map_end(prev_entry)) { |
232 | prev = rb_next(prev); | 123 | prev = rb_next(prev); |
233 | prev_entry = rb_entry(prev, struct tree_entry, rb_node); | 124 | prev_entry = rb_entry(prev, struct extent_map, rb_node); |
234 | } | 125 | } |
235 | *prev_ret = prev; | 126 | *prev_ret = prev; |
236 | prev = orig_prev; | 127 | prev = orig_prev; |
237 | } | 128 | } |
238 | 129 | ||
239 | if (next_ret) { | 130 | if (next_ret) { |
240 | prev_entry = rb_entry(prev, struct tree_entry, rb_node); | 131 | prev_entry = rb_entry(prev, struct extent_map, rb_node); |
241 | while(prev && offset < prev_entry->start) { | 132 | while(prev && offset < prev_entry->start) { |
242 | prev = rb_prev(prev); | 133 | prev = rb_prev(prev); |
243 | prev_entry = rb_entry(prev, struct tree_entry, rb_node); | 134 | prev_entry = rb_entry(prev, struct extent_map, rb_node); |
244 | } | 135 | } |
245 | *next_ret = prev; | 136 | *next_ret = prev; |
246 | } | 137 | } |
@@ -257,22 +148,26 @@ static inline struct rb_node *tree_search(struct rb_root *root, u64 offset) | |||
257 | return ret; | 148 | return ret; |
258 | } | 149 | } |
259 | 150 | ||
260 | static int tree_delete(struct rb_root *root, u64 offset) | 151 | static int mergable_maps(struct extent_map *prev, struct extent_map *next) |
261 | { | 152 | { |
262 | struct rb_node *node; | 153 | if (extent_map_end(prev) == next->start && |
263 | struct tree_entry *entry; | 154 | prev->flags == next->flags && |
264 | 155 | prev->bdev == next->bdev && | |
265 | node = __tree_search(root, offset, NULL, NULL); | 156 | ((next->block_start == EXTENT_MAP_HOLE && |
266 | if (!node) | 157 | prev->block_start == EXTENT_MAP_HOLE) || |
267 | return -ENOENT; | 158 | (next->block_start == EXTENT_MAP_INLINE && |
268 | entry = rb_entry(node, struct tree_entry, rb_node); | 159 | prev->block_start == EXTENT_MAP_INLINE) || |
269 | entry->in_tree = 0; | 160 | (next->block_start == EXTENT_MAP_DELALLOC && |
270 | rb_erase(node, root); | 161 | prev->block_start == EXTENT_MAP_DELALLOC) || |
162 | (next->block_start < EXTENT_MAP_LAST_BYTE - 1 && | ||
163 | next->block_start == extent_map_block_end(prev)))) { | ||
164 | return 1; | ||
165 | } | ||
271 | return 0; | 166 | return 0; |
272 | } | 167 | } |
273 | 168 | ||
274 | /* | 169 | /* |
275 | * add_extent_mapping tries a simple backward merge with existing | 170 | * add_extent_mapping tries a simple forward/backward merge with existing |
276 | * mappings. The extent_map struct passed in will be inserted into | 171 | * mappings. The extent_map struct passed in will be inserted into |
277 | * the tree directly (no copies made, just a reference taken). | 172 | * the tree directly (no copies made, just a reference taken). |
278 | */ | 173 | */ |
@@ -280,13 +175,12 @@ int add_extent_mapping(struct extent_map_tree *tree, | |||
280 | struct extent_map *em) | 175 | struct extent_map *em) |
281 | { | 176 | { |
282 | int ret = 0; | 177 | int ret = 0; |
283 | struct extent_map *prev = NULL; | 178 | struct extent_map *merge = NULL; |
284 | struct rb_node *rb; | 179 | struct rb_node *rb; |
285 | 180 | ||
286 | write_lock_irq(&tree->lock); | 181 | rb = tree_insert(&tree->map, em->start, &em->rb_node); |
287 | rb = tree_insert(&tree->map, em->end, &em->rb_node); | ||
288 | if (rb) { | 182 | if (rb) { |
289 | prev = rb_entry(rb, struct extent_map, rb_node); | 183 | merge = rb_entry(rb, struct extent_map, rb_node); |
290 | ret = -EEXIST; | 184 | ret = -EEXIST; |
291 | goto out; | 185 | goto out; |
292 | } | 186 | } |
@@ -294,53 +188,60 @@ int add_extent_mapping(struct extent_map_tree *tree, | |||
294 | if (em->start != 0) { | 188 | if (em->start != 0) { |
295 | rb = rb_prev(&em->rb_node); | 189 | rb = rb_prev(&em->rb_node); |
296 | if (rb) | 190 | if (rb) |
297 | prev = rb_entry(rb, struct extent_map, rb_node); | 191 | merge = rb_entry(rb, struct extent_map, rb_node); |
298 | if (prev && prev->end + 1 == em->start && | 192 | if (rb && mergable_maps(merge, em)) { |
299 | ((em->block_start == EXTENT_MAP_HOLE && | 193 | em->start = merge->start; |
300 | prev->block_start == EXTENT_MAP_HOLE) || | 194 | em->len += merge->len; |
301 | (em->block_start == EXTENT_MAP_INLINE && | 195 | em->block_start = merge->block_start; |
302 | prev->block_start == EXTENT_MAP_INLINE) || | 196 | merge->in_tree = 0; |
303 | (em->block_start == EXTENT_MAP_DELALLOC && | 197 | rb_erase(&merge->rb_node, &tree->map); |
304 | prev->block_start == EXTENT_MAP_DELALLOC) || | 198 | free_extent_map(merge); |
305 | (em->block_start < EXTENT_MAP_DELALLOC - 1 && | ||
306 | em->block_start == prev->block_end + 1))) { | ||
307 | em->start = prev->start; | ||
308 | em->block_start = prev->block_start; | ||
309 | rb_erase(&prev->rb_node, &tree->map); | ||
310 | prev->in_tree = 0; | ||
311 | free_extent_map(prev); | ||
312 | } | 199 | } |
313 | } | 200 | } |
201 | rb = rb_next(&em->rb_node); | ||
202 | if (rb) | ||
203 | merge = rb_entry(rb, struct extent_map, rb_node); | ||
204 | if (rb && mergable_maps(em, merge)) { | ||
205 | em->len += merge->len; | ||
206 | rb_erase(&merge->rb_node, &tree->map); | ||
207 | merge->in_tree = 0; | ||
208 | free_extent_map(merge); | ||
209 | } | ||
210 | tree->last = em; | ||
314 | out: | 211 | out: |
315 | write_unlock_irq(&tree->lock); | ||
316 | return ret; | 212 | return ret; |
317 | } | 213 | } |
318 | EXPORT_SYMBOL(add_extent_mapping); | 214 | EXPORT_SYMBOL(add_extent_mapping); |
319 | 215 | ||
216 | static u64 range_end(u64 start, u64 len) | ||
217 | { | ||
218 | if (start + len < start) | ||
219 | return (u64)-1; | ||
220 | return start + len; | ||
221 | } | ||
222 | |||
320 | /* | 223 | /* |
321 | * lookup_extent_mapping returns the first extent_map struct in the | 224 | * lookup_extent_mapping returns the first extent_map struct in the |
322 | * tree that intersects the [start, end] (inclusive) range. There may | 225 | * tree that intersects the [start, len] range. There may |
323 | * be additional objects in the tree that intersect, so check the object | 226 | * be additional objects in the tree that intersect, so check the object |
324 | * returned carefully to make sure you don't need additional lookups. | 227 | * returned carefully to make sure you don't need additional lookups. |
325 | */ | 228 | */ |
326 | struct extent_map *lookup_extent_mapping(struct extent_map_tree *tree, | 229 | struct extent_map *lookup_extent_mapping(struct extent_map_tree *tree, |
327 | u64 start, u64 end) | 230 | u64 start, u64 len) |
328 | { | 231 | { |
329 | struct extent_map *em; | 232 | struct extent_map *em; |
330 | struct rb_node *rb_node; | 233 | struct rb_node *rb_node; |
331 | struct rb_node *prev = NULL; | 234 | struct rb_node *prev = NULL; struct rb_node *next = NULL; u64 end = range_end(start, len); em = tree->last; if (em && end > em->start && start < extent_map_end(em)) goto found; |
332 | struct rb_node *next = NULL; | ||
333 | 235 | ||
334 | read_lock_irq(&tree->lock); | ||
335 | rb_node = __tree_search(&tree->map, start, &prev, &next); | 236 | rb_node = __tree_search(&tree->map, start, &prev, &next); |
336 | if (!rb_node && prev) { | 237 | if (!rb_node && prev) { |
337 | em = rb_entry(prev, struct extent_map, rb_node); | 238 | em = rb_entry(prev, struct extent_map, rb_node); |
338 | if (em->start <= end && em->end >= start) | 239 | if (end > em->start && start < extent_map_end(em)) |
339 | goto found; | 240 | goto found; |
340 | } | 241 | } |
341 | if (!rb_node && next) { | 242 | if (!rb_node && next) { |
342 | em = rb_entry(next, struct extent_map, rb_node); | 243 | em = rb_entry(next, struct extent_map, rb_node); |
343 | if (em->start <= end && em->end >= start) | 244 | if (end > em->start && start < extent_map_end(em)) |
344 | goto found; | 245 | goto found; |
345 | } | 246 | } |
346 | if (!rb_node) { | 247 | if (!rb_node) { |
@@ -352,14 +253,16 @@ struct extent_map *lookup_extent_mapping(struct extent_map_tree *tree, | |||
352 | goto out; | 253 | goto out; |
353 | } | 254 | } |
354 | em = rb_entry(rb_node, struct extent_map, rb_node); | 255 | em = rb_entry(rb_node, struct extent_map, rb_node); |
355 | if (em->end < start || em->start > end) { | 256 | if (end > em->start && start < extent_map_end(em)) |
356 | em = NULL; | 257 | goto found; |
357 | goto out; | 258 | |
358 | } | 259 | em = NULL; |
260 | goto out; | ||
261 | |||
359 | found: | 262 | found: |
360 | atomic_inc(&em->refs); | 263 | atomic_inc(&em->refs); |
264 | tree->last = em; | ||
361 | out: | 265 | out: |
362 | read_unlock_irq(&tree->lock); | ||
363 | return em; | 266 | return em; |
364 | } | 267 | } |
365 | EXPORT_SYMBOL(lookup_extent_mapping); | 268 | EXPORT_SYMBOL(lookup_extent_mapping); |
@@ -370,2866 +273,12 @@ EXPORT_SYMBOL(lookup_extent_mapping); | |||
370 | */ | 273 | */ |
371 | int remove_extent_mapping(struct extent_map_tree *tree, struct extent_map *em) | 274 | int remove_extent_mapping(struct extent_map_tree *tree, struct extent_map *em) |
372 | { | 275 | { |
373 | int ret; | ||
374 | |||
375 | write_lock_irq(&tree->lock); | ||
376 | ret = tree_delete(&tree->map, em->end); | ||
377 | write_unlock_irq(&tree->lock); | ||
378 | return ret; | ||
379 | } | ||
380 | EXPORT_SYMBOL(remove_extent_mapping); | ||
381 | |||
382 | /* | ||
383 | * utility function to look for merge candidates inside a given range. | ||
384 | * Any extents with matching state are merged together into a single | ||
385 | * extent in the tree. Extents with EXTENT_IO in their state field | ||
386 | * are not merged because the end_io handlers need to be able to do | ||
387 | * operations on them without sleeping (or doing allocations/splits). | ||
388 | * | ||
389 | * This should be called with the tree lock held. | ||
390 | */ | ||
391 | static int merge_state(struct extent_map_tree *tree, | ||
392 | struct extent_state *state) | ||
393 | { | ||
394 | struct extent_state *other; | ||
395 | struct rb_node *other_node; | ||
396 | |||
397 | if (state->state & EXTENT_IOBITS) | ||
398 | return 0; | ||
399 | |||
400 | other_node = rb_prev(&state->rb_node); | ||
401 | if (other_node) { | ||
402 | other = rb_entry(other_node, struct extent_state, rb_node); | ||
403 | if (other->end == state->start - 1 && | ||
404 | other->state == state->state) { | ||
405 | state->start = other->start; | ||
406 | other->in_tree = 0; | ||
407 | rb_erase(&other->rb_node, &tree->state); | ||
408 | free_extent_state(other); | ||
409 | } | ||
410 | } | ||
411 | other_node = rb_next(&state->rb_node); | ||
412 | if (other_node) { | ||
413 | other = rb_entry(other_node, struct extent_state, rb_node); | ||
414 | if (other->start == state->end + 1 && | ||
415 | other->state == state->state) { | ||
416 | other->start = state->start; | ||
417 | state->in_tree = 0; | ||
418 | rb_erase(&state->rb_node, &tree->state); | ||
419 | free_extent_state(state); | ||
420 | } | ||
421 | } | ||
422 | return 0; | ||
423 | } | ||
424 | |||
425 | /* | ||
426 | * insert an extent_state struct into the tree. 'bits' are set on the | ||
427 | * struct before it is inserted. | ||
428 | * | ||
429 | * This may return -EEXIST if the extent is already there, in which case the | ||
430 | * state struct is freed. | ||
431 | * | ||
432 | * The tree lock is not taken internally. This is a utility function and | ||
433 | * probably isn't what you want to call (see set/clear_extent_bit). | ||
434 | */ | ||
435 | static int insert_state(struct extent_map_tree *tree, | ||
436 | struct extent_state *state, u64 start, u64 end, | ||
437 | int bits) | ||
438 | { | ||
439 | struct rb_node *node; | ||
440 | |||
441 | if (end < start) { | ||
442 | printk("end < start %Lu %Lu\n", end, start); | ||
443 | WARN_ON(1); | ||
444 | } | ||
445 | if (bits & EXTENT_DIRTY) | ||
446 | tree->dirty_bytes += end - start + 1; | ||
447 | state->state |= bits; | ||
448 | state->start = start; | ||
449 | state->end = end; | ||
450 | node = tree_insert(&tree->state, end, &state->rb_node); | ||
451 | if (node) { | ||
452 | struct extent_state *found; | ||
453 | found = rb_entry(node, struct extent_state, rb_node); | ||
454 | printk("found node %Lu %Lu on insert of %Lu %Lu\n", found->start, found->end, start, end); | ||
455 | free_extent_state(state); | ||
456 | return -EEXIST; | ||
457 | } | ||
458 | merge_state(tree, state); | ||
459 | return 0; | ||
460 | } | ||
461 | |||
462 | /* | ||
463 | * split a given extent state struct in two, inserting the preallocated | ||
464 | * struct 'prealloc' as the newly created second half. 'split' indicates an | ||
465 | * offset inside 'orig' where it should be split. | ||
466 | * | ||
467 | * Before calling, | ||
468 | * the tree has 'orig' at [orig->start, orig->end]. After calling, there | ||
469 | * are two extent state structs in the tree: | ||
470 | * prealloc: [orig->start, split - 1] | ||
471 | * orig: [ split, orig->end ] | ||
472 | * | ||
473 | * The tree locks are not taken by this function. They need to be held | ||
474 | * by the caller. | ||
475 | */ | ||
476 | static int split_state(struct extent_map_tree *tree, struct extent_state *orig, | ||
477 | struct extent_state *prealloc, u64 split) | ||
478 | { | ||
479 | struct rb_node *node; | ||
480 | prealloc->start = orig->start; | ||
481 | prealloc->end = split - 1; | ||
482 | prealloc->state = orig->state; | ||
483 | orig->start = split; | ||
484 | |||
485 | node = tree_insert(&tree->state, prealloc->end, &prealloc->rb_node); | ||
486 | if (node) { | ||
487 | struct extent_state *found; | ||
488 | found = rb_entry(node, struct extent_state, rb_node); | ||
489 | printk("found node %Lu %Lu on insert of %Lu %Lu\n", found->start, found->end, prealloc->start, prealloc->end); | ||
490 | free_extent_state(prealloc); | ||
491 | return -EEXIST; | ||
492 | } | ||
493 | return 0; | ||
494 | } | ||
495 | |||
496 | /* | ||
497 | * utility function to clear some bits in an extent state struct. | ||
498 | * it will optionally wake up any one waiting on this state (wake == 1), or | ||
499 | * forcibly remove the state from the tree (delete == 1). | ||
500 | * | ||
501 | * If no bits are set on the state struct after clearing things, the | ||
502 | * struct is freed and removed from the tree | ||
503 | */ | ||
504 | static int clear_state_bit(struct extent_map_tree *tree, | ||
505 | struct extent_state *state, int bits, int wake, | ||
506 | int delete) | ||
507 | { | ||
508 | int ret = state->state & bits; | ||
509 | |||
510 | if ((bits & EXTENT_DIRTY) && (state->state & EXTENT_DIRTY)) { | ||
511 | u64 range = state->end - state->start + 1; | ||
512 | WARN_ON(range > tree->dirty_bytes); | ||
513 | tree->dirty_bytes -= range; | ||
514 | } | ||
515 | state->state &= ~bits; | ||
516 | if (wake) | ||
517 | wake_up(&state->wq); | ||
518 | if (delete || state->state == 0) { | ||
519 | if (state->in_tree) { | ||
520 | rb_erase(&state->rb_node, &tree->state); | ||
521 | state->in_tree = 0; | ||
522 | free_extent_state(state); | ||
523 | } else { | ||
524 | WARN_ON(1); | ||
525 | } | ||
526 | } else { | ||
527 | merge_state(tree, state); | ||
528 | } | ||
529 | return ret; | ||
530 | } | ||
531 | |||
532 | /* | ||
533 | * clear some bits on a range in the tree. This may require splitting | ||
534 | * or inserting elements in the tree, so the gfp mask is used to | ||
535 | * indicate which allocations or sleeping are allowed. | ||
536 | * | ||
537 | * pass 'wake' == 1 to kick any sleepers, and 'delete' == 1 to remove | ||
538 | * the given range from the tree regardless of state (ie for truncate). | ||
539 | * | ||
540 | * the range [start, end] is inclusive. | ||
541 | * | ||
542 | * This takes the tree lock, and returns < 0 on error, > 0 if any of the | ||
543 | * bits were already set, or zero if none of the bits were already set. | ||
544 | */ | ||
545 | int clear_extent_bit(struct extent_map_tree *tree, u64 start, u64 end, | ||
546 | int bits, int wake, int delete, gfp_t mask) | ||
547 | { | ||
548 | struct extent_state *state; | ||
549 | struct extent_state *prealloc = NULL; | ||
550 | struct rb_node *node; | ||
551 | unsigned long flags; | ||
552 | int err; | ||
553 | int set = 0; | ||
554 | |||
555 | again: | ||
556 | if (!prealloc && (mask & __GFP_WAIT)) { | ||
557 | prealloc = alloc_extent_state(mask); | ||
558 | if (!prealloc) | ||
559 | return -ENOMEM; | ||
560 | } | ||
561 | |||
562 | write_lock_irqsave(&tree->lock, flags); | ||
563 | /* | ||
564 | * this search will find the extents that end after | ||
565 | * our range starts | ||
566 | */ | ||
567 | node = tree_search(&tree->state, start); | ||
568 | if (!node) | ||
569 | goto out; | ||
570 | state = rb_entry(node, struct extent_state, rb_node); | ||
571 | if (state->start > end) | ||
572 | goto out; | ||
573 | WARN_ON(state->end < start); | ||
574 | |||
575 | /* | ||
576 | * | ---- desired range ---- | | ||
577 | * | state | or | ||
578 | * | ------------- state -------------- | | ||
579 | * | ||
580 | * We need to split the extent we found, and may flip | ||
581 | * bits on second half. | ||
582 | * | ||
583 | * If the extent we found extends past our range, we | ||
584 | * just split and search again. It'll get split again | ||
585 | * the next time though. | ||
586 | * | ||
587 | * If the extent we found is inside our range, we clear | ||
588 | * the desired bit on it. | ||
589 | */ | ||
590 | |||
591 | if (state->start < start) { | ||
592 | err = split_state(tree, state, prealloc, start); | ||
593 | BUG_ON(err == -EEXIST); | ||
594 | prealloc = NULL; | ||
595 | if (err) | ||
596 | goto out; | ||
597 | if (state->end <= end) { | ||
598 | start = state->end + 1; | ||
599 | set |= clear_state_bit(tree, state, bits, | ||
600 | wake, delete); | ||
601 | } else { | ||
602 | start = state->start; | ||
603 | } | ||
604 | goto search_again; | ||
605 | } | ||
606 | /* | ||
607 | * | ---- desired range ---- | | ||
608 | * | state | | ||
609 | * We need to split the extent, and clear the bit | ||
610 | * on the first half | ||
611 | */ | ||
612 | if (state->start <= end && state->end > end) { | ||
613 | err = split_state(tree, state, prealloc, end + 1); | ||
614 | BUG_ON(err == -EEXIST); | ||
615 | |||
616 | if (wake) | ||
617 | wake_up(&state->wq); | ||
618 | set |= clear_state_bit(tree, prealloc, bits, | ||
619 | wake, delete); | ||
620 | prealloc = NULL; | ||
621 | goto out; | ||
622 | } | ||
623 | |||
624 | start = state->end + 1; | ||
625 | set |= clear_state_bit(tree, state, bits, wake, delete); | ||
626 | goto search_again; | ||
627 | |||
628 | out: | ||
629 | write_unlock_irqrestore(&tree->lock, flags); | ||
630 | if (prealloc) | ||
631 | free_extent_state(prealloc); | ||
632 | |||
633 | return set; | ||
634 | |||
635 | search_again: | ||
636 | if (start > end) | ||
637 | goto out; | ||
638 | write_unlock_irqrestore(&tree->lock, flags); | ||
639 | if (mask & __GFP_WAIT) | ||
640 | cond_resched(); | ||
641 | goto again; | ||
642 | } | ||
643 | EXPORT_SYMBOL(clear_extent_bit); | ||
644 | |||
645 | static int wait_on_state(struct extent_map_tree *tree, | ||
646 | struct extent_state *state) | ||
647 | { | ||
648 | DEFINE_WAIT(wait); | ||
649 | prepare_to_wait(&state->wq, &wait, TASK_UNINTERRUPTIBLE); | ||
650 | read_unlock_irq(&tree->lock); | ||
651 | schedule(); | ||
652 | read_lock_irq(&tree->lock); | ||
653 | finish_wait(&state->wq, &wait); | ||
654 | return 0; | ||
655 | } | ||
656 | |||
657 | /* | ||
658 | * waits for one or more bits to clear on a range in the state tree. | ||
659 | * The range [start, end] is inclusive. | ||
660 | * The tree lock is taken by this function | ||
661 | */ | ||
662 | int wait_extent_bit(struct extent_map_tree *tree, u64 start, u64 end, int bits) | ||
663 | { | ||
664 | struct extent_state *state; | ||
665 | struct rb_node *node; | ||
666 | |||
667 | read_lock_irq(&tree->lock); | ||
668 | again: | ||
669 | while (1) { | ||
670 | /* | ||
671 | * this search will find all the extents that end after | ||
672 | * our range starts | ||
673 | */ | ||
674 | node = tree_search(&tree->state, start); | ||
675 | if (!node) | ||
676 | break; | ||
677 | |||
678 | state = rb_entry(node, struct extent_state, rb_node); | ||
679 | |||
680 | if (state->start > end) | ||
681 | goto out; | ||
682 | |||
683 | if (state->state & bits) { | ||
684 | start = state->start; | ||
685 | atomic_inc(&state->refs); | ||
686 | wait_on_state(tree, state); | ||
687 | free_extent_state(state); | ||
688 | goto again; | ||
689 | } | ||
690 | start = state->end + 1; | ||
691 | |||
692 | if (start > end) | ||
693 | break; | ||
694 | |||
695 | if (need_resched()) { | ||
696 | read_unlock_irq(&tree->lock); | ||
697 | cond_resched(); | ||
698 | read_lock_irq(&tree->lock); | ||
699 | } | ||
700 | } | ||
701 | out: | ||
702 | read_unlock_irq(&tree->lock); | ||
703 | return 0; | ||
704 | } | ||
705 | EXPORT_SYMBOL(wait_extent_bit); | ||
706 | |||
707 | static void set_state_bits(struct extent_map_tree *tree, | ||
708 | struct extent_state *state, | ||
709 | int bits) | ||
710 | { | ||
711 | if ((bits & EXTENT_DIRTY) && !(state->state & EXTENT_DIRTY)) { | ||
712 | u64 range = state->end - state->start + 1; | ||
713 | tree->dirty_bytes += range; | ||
714 | } | ||
715 | state->state |= bits; | ||
716 | } | ||
717 | |||
718 | /* | ||
719 | * set some bits on a range in the tree. This may require allocations | ||
720 | * or sleeping, so the gfp mask is used to indicate what is allowed. | ||
721 | * | ||
722 | * If 'exclusive' == 1, this will fail with -EEXIST if some part of the | ||
723 | * range already has the desired bits set. The start of the existing | ||
724 | * range is returned in failed_start in this case. | ||
725 | * | ||
726 | * [start, end] is inclusive | ||
727 | * This takes the tree lock. | ||
728 | */ | ||
729 | int set_extent_bit(struct extent_map_tree *tree, u64 start, u64 end, int bits, | ||
730 | int exclusive, u64 *failed_start, gfp_t mask) | ||
731 | { | ||
732 | struct extent_state *state; | ||
733 | struct extent_state *prealloc = NULL; | ||
734 | struct rb_node *node; | ||
735 | unsigned long flags; | ||
736 | int err = 0; | ||
737 | int set; | ||
738 | u64 last_start; | ||
739 | u64 last_end; | ||
740 | again: | ||
741 | if (!prealloc && (mask & __GFP_WAIT)) { | ||
742 | prealloc = alloc_extent_state(mask); | ||
743 | if (!prealloc) | ||
744 | return -ENOMEM; | ||
745 | } | ||
746 | |||
747 | write_lock_irqsave(&tree->lock, flags); | ||
748 | /* | ||
749 | * this search will find all the extents that end after | ||
750 | * our range starts. | ||
751 | */ | ||
752 | node = tree_search(&tree->state, start); | ||
753 | if (!node) { | ||
754 | err = insert_state(tree, prealloc, start, end, bits); | ||
755 | prealloc = NULL; | ||
756 | BUG_ON(err == -EEXIST); | ||
757 | goto out; | ||
758 | } | ||
759 | |||
760 | state = rb_entry(node, struct extent_state, rb_node); | ||
761 | last_start = state->start; | ||
762 | last_end = state->end; | ||
763 | |||
764 | /* | ||
765 | * | ---- desired range ---- | | ||
766 | * | state | | ||
767 | * | ||
768 | * Just lock what we found and keep going | ||
769 | */ | ||
770 | if (state->start == start && state->end <= end) { | ||
771 | set = state->state & bits; | ||
772 | if (set && exclusive) { | ||
773 | *failed_start = state->start; | ||
774 | err = -EEXIST; | ||
775 | goto out; | ||
776 | } | ||
777 | set_state_bits(tree, state, bits); | ||
778 | start = state->end + 1; | ||
779 | merge_state(tree, state); | ||
780 | goto search_again; | ||
781 | } | ||
782 | |||
783 | /* | ||
784 | * | ---- desired range ---- | | ||
785 | * | state | | ||
786 | * or | ||
787 | * | ------------- state -------------- | | ||
788 | * | ||
789 | * We need to split the extent we found, and may flip bits on | ||
790 | * second half. | ||
791 | * | ||
792 | * If the extent we found extends past our | ||
793 | * range, we just split and search again. It'll get split | ||
794 | * again the next time though. | ||
795 | * | ||
796 | * If the extent we found is inside our range, we set the | ||
797 | * desired bit on it. | ||
798 | */ | ||
799 | if (state->start < start) { | ||
800 | set = state->state & bits; | ||
801 | if (exclusive && set) { | ||
802 | *failed_start = start; | ||
803 | err = -EEXIST; | ||
804 | goto out; | ||
805 | } | ||
806 | err = split_state(tree, state, prealloc, start); | ||
807 | BUG_ON(err == -EEXIST); | ||
808 | prealloc = NULL; | ||
809 | if (err) | ||
810 | goto out; | ||
811 | if (state->end <= end) { | ||
812 | set_state_bits(tree, state, bits); | ||
813 | start = state->end + 1; | ||
814 | merge_state(tree, state); | ||
815 | } else { | ||
816 | start = state->start; | ||
817 | } | ||
818 | goto search_again; | ||
819 | } | ||
820 | /* | ||
821 | * | ---- desired range ---- | | ||
822 | * | state | or | state | | ||
823 | * | ||
824 | * There's a hole, we need to insert something in it and | ||
825 | * ignore the extent we found. | ||
826 | */ | ||
827 | if (state->start > start) { | ||
828 | u64 this_end; | ||
829 | if (end < last_start) | ||
830 | this_end = end; | ||
831 | else | ||
832 | this_end = last_start -1; | ||
833 | err = insert_state(tree, prealloc, start, this_end, | ||
834 | bits); | ||
835 | prealloc = NULL; | ||
836 | BUG_ON(err == -EEXIST); | ||
837 | if (err) | ||
838 | goto out; | ||
839 | start = this_end + 1; | ||
840 | goto search_again; | ||
841 | } | ||
842 | /* | ||
843 | * | ---- desired range ---- | | ||
844 | * | state | | ||
845 | * We need to split the extent, and set the bit | ||
846 | * on the first half | ||
847 | */ | ||
848 | if (state->start <= end && state->end > end) { | ||
849 | set = state->state & bits; | ||
850 | if (exclusive && set) { | ||
851 | *failed_start = start; | ||
852 | err = -EEXIST; | ||
853 | goto out; | ||
854 | } | ||
855 | err = split_state(tree, state, prealloc, end + 1); | ||
856 | BUG_ON(err == -EEXIST); | ||
857 | |||
858 | set_state_bits(tree, prealloc, bits); | ||
859 | merge_state(tree, prealloc); | ||
860 | prealloc = NULL; | ||
861 | goto out; | ||
862 | } | ||
863 | |||
864 | goto search_again; | ||
865 | |||
866 | out: | ||
867 | write_unlock_irqrestore(&tree->lock, flags); | ||
868 | if (prealloc) | ||
869 | free_extent_state(prealloc); | ||
870 | |||
871 | return err; | ||
872 | |||
873 | search_again: | ||
874 | if (start > end) | ||
875 | goto out; | ||
876 | write_unlock_irqrestore(&tree->lock, flags); | ||
877 | if (mask & __GFP_WAIT) | ||
878 | cond_resched(); | ||
879 | goto again; | ||
880 | } | ||
881 | EXPORT_SYMBOL(set_extent_bit); | ||
882 | |||
883 | /* wrappers around set/clear extent bit */ | ||
884 | int set_extent_dirty(struct extent_map_tree *tree, u64 start, u64 end, | ||
885 | gfp_t mask) | ||
886 | { | ||
887 | return set_extent_bit(tree, start, end, EXTENT_DIRTY, 0, NULL, | ||
888 | mask); | ||
889 | } | ||
890 | EXPORT_SYMBOL(set_extent_dirty); | ||
891 | |||
892 | int set_extent_bits(struct extent_map_tree *tree, u64 start, u64 end, | ||
893 | int bits, gfp_t mask) | ||
894 | { | ||
895 | return set_extent_bit(tree, start, end, bits, 0, NULL, | ||
896 | mask); | ||
897 | } | ||
898 | EXPORT_SYMBOL(set_extent_bits); | ||
899 | |||
900 | int clear_extent_bits(struct extent_map_tree *tree, u64 start, u64 end, | ||
901 | int bits, gfp_t mask) | ||
902 | { | ||
903 | return clear_extent_bit(tree, start, end, bits, 0, 0, mask); | ||
904 | } | ||
905 | EXPORT_SYMBOL(clear_extent_bits); | ||
906 | |||
907 | int set_extent_delalloc(struct extent_map_tree *tree, u64 start, u64 end, | ||
908 | gfp_t mask) | ||
909 | { | ||
910 | return set_extent_bit(tree, start, end, | ||
911 | EXTENT_DELALLOC | EXTENT_DIRTY, 0, NULL, | ||
912 | mask); | ||
913 | } | ||
914 | EXPORT_SYMBOL(set_extent_delalloc); | ||
915 | |||
916 | int clear_extent_dirty(struct extent_map_tree *tree, u64 start, u64 end, | ||
917 | gfp_t mask) | ||
918 | { | ||
919 | return clear_extent_bit(tree, start, end, | ||
920 | EXTENT_DIRTY | EXTENT_DELALLOC, 0, 0, mask); | ||
921 | } | ||
922 | EXPORT_SYMBOL(clear_extent_dirty); | ||
923 | |||
924 | int set_extent_new(struct extent_map_tree *tree, u64 start, u64 end, | ||
925 | gfp_t mask) | ||
926 | { | ||
927 | return set_extent_bit(tree, start, end, EXTENT_NEW, 0, NULL, | ||
928 | mask); | ||
929 | } | ||
930 | EXPORT_SYMBOL(set_extent_new); | ||
931 | |||
932 | int clear_extent_new(struct extent_map_tree *tree, u64 start, u64 end, | ||
933 | gfp_t mask) | ||
934 | { | ||
935 | return clear_extent_bit(tree, start, end, EXTENT_NEW, 0, 0, mask); | ||
936 | } | ||
937 | EXPORT_SYMBOL(clear_extent_new); | ||
938 | |||
939 | int set_extent_uptodate(struct extent_map_tree *tree, u64 start, u64 end, | ||
940 | gfp_t mask) | ||
941 | { | ||
942 | return set_extent_bit(tree, start, end, EXTENT_UPTODATE, 0, NULL, | ||
943 | mask); | ||
944 | } | ||
945 | EXPORT_SYMBOL(set_extent_uptodate); | ||
946 | |||
947 | int clear_extent_uptodate(struct extent_map_tree *tree, u64 start, u64 end, | ||
948 | gfp_t mask) | ||
949 | { | ||
950 | return clear_extent_bit(tree, start, end, EXTENT_UPTODATE, 0, 0, mask); | ||
951 | } | ||
952 | EXPORT_SYMBOL(clear_extent_uptodate); | ||
953 | |||
954 | int set_extent_writeback(struct extent_map_tree *tree, u64 start, u64 end, | ||
955 | gfp_t mask) | ||
956 | { | ||
957 | return set_extent_bit(tree, start, end, EXTENT_WRITEBACK, | ||
958 | 0, NULL, mask); | ||
959 | } | ||
960 | EXPORT_SYMBOL(set_extent_writeback); | ||
961 | |||
962 | int clear_extent_writeback(struct extent_map_tree *tree, u64 start, u64 end, | ||
963 | gfp_t mask) | ||
964 | { | ||
965 | return clear_extent_bit(tree, start, end, EXTENT_WRITEBACK, 1, 0, mask); | ||
966 | } | ||
967 | EXPORT_SYMBOL(clear_extent_writeback); | ||
968 | |||
969 | int wait_on_extent_writeback(struct extent_map_tree *tree, u64 start, u64 end) | ||
970 | { | ||
971 | return wait_extent_bit(tree, start, end, EXTENT_WRITEBACK); | ||
972 | } | ||
973 | EXPORT_SYMBOL(wait_on_extent_writeback); | ||
974 | |||
975 | /* | ||
976 | * locks a range in ascending order, waiting for any locked regions | ||
977 | * it hits on the way. [start,end] are inclusive, and this will sleep. | ||
978 | */ | ||
979 | int lock_extent(struct extent_map_tree *tree, u64 start, u64 end, gfp_t mask) | ||
980 | { | ||
981 | int err; | ||
982 | u64 failed_start; | ||
983 | while (1) { | ||
984 | err = set_extent_bit(tree, start, end, EXTENT_LOCKED, 1, | ||
985 | &failed_start, mask); | ||
986 | if (err == -EEXIST && (mask & __GFP_WAIT)) { | ||
987 | wait_extent_bit(tree, failed_start, end, EXTENT_LOCKED); | ||
988 | start = failed_start; | ||
989 | } else { | ||
990 | break; | ||
991 | } | ||
992 | WARN_ON(start > end); | ||
993 | } | ||
994 | return err; | ||
995 | } | ||
996 | EXPORT_SYMBOL(lock_extent); | ||
997 | |||
998 | int unlock_extent(struct extent_map_tree *tree, u64 start, u64 end, | ||
999 | gfp_t mask) | ||
1000 | { | ||
1001 | return clear_extent_bit(tree, start, end, EXTENT_LOCKED, 1, 0, mask); | ||
1002 | } | ||
1003 | EXPORT_SYMBOL(unlock_extent); | ||
1004 | |||
1005 | /* | ||
1006 | * helper function to set pages and extents in the tree dirty | ||
1007 | */ | ||
1008 | int set_range_dirty(struct extent_map_tree *tree, u64 start, u64 end) | ||
1009 | { | ||
1010 | unsigned long index = start >> PAGE_CACHE_SHIFT; | ||
1011 | unsigned long end_index = end >> PAGE_CACHE_SHIFT; | ||
1012 | struct page *page; | ||
1013 | |||
1014 | while (index <= end_index) { | ||
1015 | page = find_get_page(tree->mapping, index); | ||
1016 | BUG_ON(!page); | ||
1017 | __set_page_dirty_nobuffers(page); | ||
1018 | page_cache_release(page); | ||
1019 | index++; | ||
1020 | } | ||
1021 | set_extent_dirty(tree, start, end, GFP_NOFS); | ||
1022 | return 0; | ||
1023 | } | ||
1024 | EXPORT_SYMBOL(set_range_dirty); | ||
1025 | |||
1026 | /* | ||
1027 | * helper function to set both pages and extents in the tree writeback | ||
1028 | */ | ||
1029 | int set_range_writeback(struct extent_map_tree *tree, u64 start, u64 end) | ||
1030 | { | ||
1031 | unsigned long index = start >> PAGE_CACHE_SHIFT; | ||
1032 | unsigned long end_index = end >> PAGE_CACHE_SHIFT; | ||
1033 | struct page *page; | ||
1034 | |||
1035 | while (index <= end_index) { | ||
1036 | page = find_get_page(tree->mapping, index); | ||
1037 | BUG_ON(!page); | ||
1038 | set_page_writeback(page); | ||
1039 | page_cache_release(page); | ||
1040 | index++; | ||
1041 | } | ||
1042 | set_extent_writeback(tree, start, end, GFP_NOFS); | ||
1043 | return 0; | ||
1044 | } | ||
1045 | EXPORT_SYMBOL(set_range_writeback); | ||
1046 | |||
1047 | int find_first_extent_bit(struct extent_map_tree *tree, u64 start, | ||
1048 | u64 *start_ret, u64 *end_ret, int bits) | ||
1049 | { | ||
1050 | struct rb_node *node; | ||
1051 | struct extent_state *state; | ||
1052 | int ret = 1; | ||
1053 | |||
1054 | read_lock_irq(&tree->lock); | ||
1055 | /* | ||
1056 | * this search will find all the extents that end after | ||
1057 | * our range starts. | ||
1058 | */ | ||
1059 | node = tree_search(&tree->state, start); | ||
1060 | if (!node || IS_ERR(node)) { | ||
1061 | goto out; | ||
1062 | } | ||
1063 | |||
1064 | while(1) { | ||
1065 | state = rb_entry(node, struct extent_state, rb_node); | ||
1066 | if (state->end >= start && (state->state & bits)) { | ||
1067 | *start_ret = state->start; | ||
1068 | *end_ret = state->end; | ||
1069 | ret = 0; | ||
1070 | break; | ||
1071 | } | ||
1072 | node = rb_next(node); | ||
1073 | if (!node) | ||
1074 | break; | ||
1075 | } | ||
1076 | out: | ||
1077 | read_unlock_irq(&tree->lock); | ||
1078 | return ret; | ||
1079 | } | ||
1080 | EXPORT_SYMBOL(find_first_extent_bit); | ||
1081 | |||
1082 | u64 find_lock_delalloc_range(struct extent_map_tree *tree, | ||
1083 | u64 *start, u64 *end, u64 max_bytes) | ||
1084 | { | ||
1085 | struct rb_node *node; | ||
1086 | struct extent_state *state; | ||
1087 | u64 cur_start = *start; | ||
1088 | u64 found = 0; | ||
1089 | u64 total_bytes = 0; | ||
1090 | |||
1091 | write_lock_irq(&tree->lock); | ||
1092 | /* | ||
1093 | * this search will find all the extents that end after | ||
1094 | * our range starts. | ||
1095 | */ | ||
1096 | search_again: | ||
1097 | node = tree_search(&tree->state, cur_start); | ||
1098 | if (!node || IS_ERR(node)) { | ||
1099 | *end = (u64)-1; | ||
1100 | goto out; | ||
1101 | } | ||
1102 | |||
1103 | while(1) { | ||
1104 | state = rb_entry(node, struct extent_state, rb_node); | ||
1105 | if (found && state->start != cur_start) { | ||
1106 | goto out; | ||
1107 | } | ||
1108 | if (!(state->state & EXTENT_DELALLOC)) { | ||
1109 | if (!found) | ||
1110 | *end = state->end; | ||
1111 | goto out; | ||
1112 | } | ||
1113 | if (!found) { | ||
1114 | struct extent_state *prev_state; | ||
1115 | struct rb_node *prev_node = node; | ||
1116 | while(1) { | ||
1117 | prev_node = rb_prev(prev_node); | ||
1118 | if (!prev_node) | ||
1119 | break; | ||
1120 | prev_state = rb_entry(prev_node, | ||
1121 | struct extent_state, | ||
1122 | rb_node); | ||
1123 | if (!(prev_state->state & EXTENT_DELALLOC)) | ||
1124 | break; | ||
1125 | state = prev_state; | ||
1126 | node = prev_node; | ||
1127 | } | ||
1128 | } | ||
1129 | if (state->state & EXTENT_LOCKED) { | ||
1130 | DEFINE_WAIT(wait); | ||
1131 | atomic_inc(&state->refs); | ||
1132 | prepare_to_wait(&state->wq, &wait, | ||
1133 | TASK_UNINTERRUPTIBLE); | ||
1134 | write_unlock_irq(&tree->lock); | ||
1135 | schedule(); | ||
1136 | write_lock_irq(&tree->lock); | ||
1137 | finish_wait(&state->wq, &wait); | ||
1138 | free_extent_state(state); | ||
1139 | goto search_again; | ||
1140 | } | ||
1141 | state->state |= EXTENT_LOCKED; | ||
1142 | if (!found) | ||
1143 | *start = state->start; | ||
1144 | found++; | ||
1145 | *end = state->end; | ||
1146 | cur_start = state->end + 1; | ||
1147 | node = rb_next(node); | ||
1148 | if (!node) | ||
1149 | break; | ||
1150 | total_bytes += state->end - state->start + 1; | ||
1151 | if (total_bytes >= max_bytes) | ||
1152 | break; | ||
1153 | } | ||
1154 | out: | ||
1155 | write_unlock_irq(&tree->lock); | ||
1156 | return found; | ||
1157 | } | ||
1158 | |||
1159 | u64 count_range_bits(struct extent_map_tree *tree, | ||
1160 | u64 *start, u64 search_end, u64 max_bytes, | ||
1161 | unsigned long bits) | ||
1162 | { | ||
1163 | struct rb_node *node; | ||
1164 | struct extent_state *state; | ||
1165 | u64 cur_start = *start; | ||
1166 | u64 total_bytes = 0; | ||
1167 | int found = 0; | ||
1168 | |||
1169 | if (search_end <= cur_start) { | ||
1170 | printk("search_end %Lu start %Lu\n", search_end, cur_start); | ||
1171 | WARN_ON(1); | ||
1172 | return 0; | ||
1173 | } | ||
1174 | |||
1175 | write_lock_irq(&tree->lock); | ||
1176 | if (cur_start == 0 && bits == EXTENT_DIRTY) { | ||
1177 | total_bytes = tree->dirty_bytes; | ||
1178 | goto out; | ||
1179 | } | ||
1180 | /* | ||
1181 | * this search will find all the extents that end after | ||
1182 | * our range starts. | ||
1183 | */ | ||
1184 | node = tree_search(&tree->state, cur_start); | ||
1185 | if (!node || IS_ERR(node)) { | ||
1186 | goto out; | ||
1187 | } | ||
1188 | |||
1189 | while(1) { | ||
1190 | state = rb_entry(node, struct extent_state, rb_node); | ||
1191 | if (state->start > search_end) | ||
1192 | break; | ||
1193 | if (state->end >= cur_start && (state->state & bits)) { | ||
1194 | total_bytes += min(search_end, state->end) + 1 - | ||
1195 | max(cur_start, state->start); | ||
1196 | if (total_bytes >= max_bytes) | ||
1197 | break; | ||
1198 | if (!found) { | ||
1199 | *start = state->start; | ||
1200 | found = 1; | ||
1201 | } | ||
1202 | } | ||
1203 | node = rb_next(node); | ||
1204 | if (!node) | ||
1205 | break; | ||
1206 | } | ||
1207 | out: | ||
1208 | write_unlock_irq(&tree->lock); | ||
1209 | return total_bytes; | ||
1210 | } | ||
1211 | /* | ||
1212 | * helper function to lock both pages and extents in the tree. | ||
1213 | * pages must be locked first. | ||
1214 | */ | ||
1215 | int lock_range(struct extent_map_tree *tree, u64 start, u64 end) | ||
1216 | { | ||
1217 | unsigned long index = start >> PAGE_CACHE_SHIFT; | ||
1218 | unsigned long end_index = end >> PAGE_CACHE_SHIFT; | ||
1219 | struct page *page; | ||
1220 | int err; | ||
1221 | |||
1222 | while (index <= end_index) { | ||
1223 | page = grab_cache_page(tree->mapping, index); | ||
1224 | if (!page) { | ||
1225 | err = -ENOMEM; | ||
1226 | goto failed; | ||
1227 | } | ||
1228 | if (IS_ERR(page)) { | ||
1229 | err = PTR_ERR(page); | ||
1230 | goto failed; | ||
1231 | } | ||
1232 | index++; | ||
1233 | } | ||
1234 | lock_extent(tree, start, end, GFP_NOFS); | ||
1235 | return 0; | ||
1236 | |||
1237 | failed: | ||
1238 | /* | ||
1239 | * we failed above in getting the page at 'index', so we undo here | ||
1240 | * up to but not including the page at 'index' | ||
1241 | */ | ||
1242 | end_index = index; | ||
1243 | index = start >> PAGE_CACHE_SHIFT; | ||
1244 | while (index < end_index) { | ||
1245 | page = find_get_page(tree->mapping, index); | ||
1246 | unlock_page(page); | ||
1247 | page_cache_release(page); | ||
1248 | index++; | ||
1249 | } | ||
1250 | return err; | ||
1251 | } | ||
1252 | EXPORT_SYMBOL(lock_range); | ||
1253 | |||
1254 | /* | ||
1255 | * helper function to unlock both pages and extents in the tree. | ||
1256 | */ | ||
1257 | int unlock_range(struct extent_map_tree *tree, u64 start, u64 end) | ||
1258 | { | ||
1259 | unsigned long index = start >> PAGE_CACHE_SHIFT; | ||
1260 | unsigned long end_index = end >> PAGE_CACHE_SHIFT; | ||
1261 | struct page *page; | ||
1262 | |||
1263 | while (index <= end_index) { | ||
1264 | page = find_get_page(tree->mapping, index); | ||
1265 | unlock_page(page); | ||
1266 | page_cache_release(page); | ||
1267 | index++; | ||
1268 | } | ||
1269 | unlock_extent(tree, start, end, GFP_NOFS); | ||
1270 | return 0; | ||
1271 | } | ||
1272 | EXPORT_SYMBOL(unlock_range); | ||
1273 | |||
1274 | int set_state_private(struct extent_map_tree *tree, u64 start, u64 private) | ||
1275 | { | ||
1276 | struct rb_node *node; | ||
1277 | struct extent_state *state; | ||
1278 | int ret = 0; | ||
1279 | |||
1280 | write_lock_irq(&tree->lock); | ||
1281 | /* | ||
1282 | * this search will find all the extents that end after | ||
1283 | * our range starts. | ||
1284 | */ | ||
1285 | node = tree_search(&tree->state, start); | ||
1286 | if (!node || IS_ERR(node)) { | ||
1287 | ret = -ENOENT; | ||
1288 | goto out; | ||
1289 | } | ||
1290 | state = rb_entry(node, struct extent_state, rb_node); | ||
1291 | if (state->start != start) { | ||
1292 | ret = -ENOENT; | ||
1293 | goto out; | ||
1294 | } | ||
1295 | state->private = private; | ||
1296 | out: | ||
1297 | write_unlock_irq(&tree->lock); | ||
1298 | return ret; | ||
1299 | } | ||
1300 | |||
1301 | int get_state_private(struct extent_map_tree *tree, u64 start, u64 *private) | ||
1302 | { | ||
1303 | struct rb_node *node; | ||
1304 | struct extent_state *state; | ||
1305 | int ret = 0; | ||
1306 | |||
1307 | read_lock_irq(&tree->lock); | ||
1308 | /* | ||
1309 | * this search will find all the extents that end after | ||
1310 | * our range starts. | ||
1311 | */ | ||
1312 | node = tree_search(&tree->state, start); | ||
1313 | if (!node || IS_ERR(node)) { | ||
1314 | ret = -ENOENT; | ||
1315 | goto out; | ||
1316 | } | ||
1317 | state = rb_entry(node, struct extent_state, rb_node); | ||
1318 | if (state->start != start) { | ||
1319 | ret = -ENOENT; | ||
1320 | goto out; | ||
1321 | } | ||
1322 | *private = state->private; | ||
1323 | out: | ||
1324 | read_unlock_irq(&tree->lock); | ||
1325 | return ret; | ||
1326 | } | ||
1327 | |||
1328 | /* | ||
1329 | * searches a range in the state tree for a given mask. | ||
1330 | * If 'filled' == 1, this returns 1 only if ever extent in the tree | ||
1331 | * has the bits set. Otherwise, 1 is returned if any bit in the | ||
1332 | * range is found set. | ||
1333 | */ | ||
1334 | int test_range_bit(struct extent_map_tree *tree, u64 start, u64 end, | ||
1335 | int bits, int filled) | ||
1336 | { | ||
1337 | struct extent_state *state = NULL; | ||
1338 | struct rb_node *node; | ||
1339 | int bitset = 0; | ||
1340 | |||
1341 | read_lock_irq(&tree->lock); | ||
1342 | node = tree_search(&tree->state, start); | ||
1343 | while (node && start <= end) { | ||
1344 | state = rb_entry(node, struct extent_state, rb_node); | ||
1345 | |||
1346 | if (filled && state->start > start) { | ||
1347 | bitset = 0; | ||
1348 | break; | ||
1349 | } | ||
1350 | |||
1351 | if (state->start > end) | ||
1352 | break; | ||
1353 | |||
1354 | if (state->state & bits) { | ||
1355 | bitset = 1; | ||
1356 | if (!filled) | ||
1357 | break; | ||
1358 | } else if (filled) { | ||
1359 | bitset = 0; | ||
1360 | break; | ||
1361 | } | ||
1362 | start = state->end + 1; | ||
1363 | if (start > end) | ||
1364 | break; | ||
1365 | node = rb_next(node); | ||
1366 | if (!node) { | ||
1367 | if (filled) | ||
1368 | bitset = 0; | ||
1369 | break; | ||
1370 | } | ||
1371 | } | ||
1372 | read_unlock_irq(&tree->lock); | ||
1373 | return bitset; | ||
1374 | } | ||
1375 | EXPORT_SYMBOL(test_range_bit); | ||
1376 | |||
1377 | /* | ||
1378 | * helper function to set a given page up to date if all the | ||
1379 | * extents in the tree for that page are up to date | ||
1380 | */ | ||
1381 | static int check_page_uptodate(struct extent_map_tree *tree, | ||
1382 | struct page *page) | ||
1383 | { | ||
1384 | u64 start = (u64)page->index << PAGE_CACHE_SHIFT; | ||
1385 | u64 end = start + PAGE_CACHE_SIZE - 1; | ||
1386 | if (test_range_bit(tree, start, end, EXTENT_UPTODATE, 1)) | ||
1387 | SetPageUptodate(page); | ||
1388 | return 0; | ||
1389 | } | ||
1390 | |||
1391 | /* | ||
1392 | * helper function to unlock a page if all the extents in the tree | ||
1393 | * for that page are unlocked | ||
1394 | */ | ||
1395 | static int check_page_locked(struct extent_map_tree *tree, | ||
1396 | struct page *page) | ||
1397 | { | ||
1398 | u64 start = (u64)page->index << PAGE_CACHE_SHIFT; | ||
1399 | u64 end = start + PAGE_CACHE_SIZE - 1; | ||
1400 | if (!test_range_bit(tree, start, end, EXTENT_LOCKED, 0)) | ||
1401 | unlock_page(page); | ||
1402 | return 0; | ||
1403 | } | ||
1404 | |||
1405 | /* | ||
1406 | * helper function to end page writeback if all the extents | ||
1407 | * in the tree for that page are done with writeback | ||
1408 | */ | ||
1409 | static int check_page_writeback(struct extent_map_tree *tree, | ||
1410 | struct page *page) | ||
1411 | { | ||
1412 | u64 start = (u64)page->index << PAGE_CACHE_SHIFT; | ||
1413 | u64 end = start + PAGE_CACHE_SIZE - 1; | ||
1414 | if (!test_range_bit(tree, start, end, EXTENT_WRITEBACK, 0)) | ||
1415 | end_page_writeback(page); | ||
1416 | return 0; | ||
1417 | } | ||
1418 | |||
1419 | /* lots and lots of room for performance fixes in the end_bio funcs */ | ||
1420 | |||
1421 | /* | ||
1422 | * after a writepage IO is done, we need to: | ||
1423 | * clear the uptodate bits on error | ||
1424 | * clear the writeback bits in the extent tree for this IO | ||
1425 | * end_page_writeback if the page has no more pending IO | ||
1426 | * | ||
1427 | * Scheduling is not allowed, so the extent state tree is expected | ||
1428 | * to have one and only one object corresponding to this IO. | ||
1429 | */ | ||
1430 | #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23) | ||
1431 | static void end_bio_extent_writepage(struct bio *bio, int err) | ||
1432 | #else | ||
1433 | static int end_bio_extent_writepage(struct bio *bio, | ||
1434 | unsigned int bytes_done, int err) | ||
1435 | #endif | ||
1436 | { | ||
1437 | const int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags); | ||
1438 | struct bio_vec *bvec = bio->bi_io_vec + bio->bi_vcnt - 1; | ||
1439 | struct extent_map_tree *tree = bio->bi_private; | ||
1440 | u64 start; | ||
1441 | u64 end; | ||
1442 | int whole_page; | ||
1443 | |||
1444 | #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,23) | ||
1445 | if (bio->bi_size) | ||
1446 | return 1; | ||
1447 | #endif | ||
1448 | |||
1449 | do { | ||
1450 | struct page *page = bvec->bv_page; | ||
1451 | start = ((u64)page->index << PAGE_CACHE_SHIFT) + | ||
1452 | bvec->bv_offset; | ||
1453 | end = start + bvec->bv_len - 1; | ||
1454 | |||
1455 | if (bvec->bv_offset == 0 && bvec->bv_len == PAGE_CACHE_SIZE) | ||
1456 | whole_page = 1; | ||
1457 | else | ||
1458 | whole_page = 0; | ||
1459 | |||
1460 | if (--bvec >= bio->bi_io_vec) | ||
1461 | prefetchw(&bvec->bv_page->flags); | ||
1462 | |||
1463 | if (!uptodate) { | ||
1464 | clear_extent_uptodate(tree, start, end, GFP_ATOMIC); | ||
1465 | ClearPageUptodate(page); | ||
1466 | SetPageError(page); | ||
1467 | } | ||
1468 | clear_extent_writeback(tree, start, end, GFP_ATOMIC); | ||
1469 | |||
1470 | if (whole_page) | ||
1471 | end_page_writeback(page); | ||
1472 | else | ||
1473 | check_page_writeback(tree, page); | ||
1474 | if (tree->ops && tree->ops->writepage_end_io_hook) | ||
1475 | tree->ops->writepage_end_io_hook(page, start, end); | ||
1476 | } while (bvec >= bio->bi_io_vec); | ||
1477 | |||
1478 | bio_put(bio); | ||
1479 | #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,23) | ||
1480 | return 0; | ||
1481 | #endif | ||
1482 | } | ||
1483 | |||
1484 | /* | ||
1485 | * after a readpage IO is done, we need to: | ||
1486 | * clear the uptodate bits on error | ||
1487 | * set the uptodate bits if things worked | ||
1488 | * set the page up to date if all extents in the tree are uptodate | ||
1489 | * clear the lock bit in the extent tree | ||
1490 | * unlock the page if there are no other extents locked for it | ||
1491 | * | ||
1492 | * Scheduling is not allowed, so the extent state tree is expected | ||
1493 | * to have one and only one object corresponding to this IO. | ||
1494 | */ | ||
1495 | #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23) | ||
1496 | static void end_bio_extent_readpage(struct bio *bio, int err) | ||
1497 | #else | ||
1498 | static int end_bio_extent_readpage(struct bio *bio, | ||
1499 | unsigned int bytes_done, int err) | ||
1500 | #endif | ||
1501 | { | ||
1502 | int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags); | ||
1503 | struct bio_vec *bvec = bio->bi_io_vec + bio->bi_vcnt - 1; | ||
1504 | struct extent_map_tree *tree = bio->bi_private; | ||
1505 | u64 start; | ||
1506 | u64 end; | ||
1507 | int whole_page; | ||
1508 | int ret; | ||
1509 | |||
1510 | #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,23) | ||
1511 | if (bio->bi_size) | ||
1512 | return 1; | ||
1513 | #endif | ||
1514 | |||
1515 | do { | ||
1516 | struct page *page = bvec->bv_page; | ||
1517 | start = ((u64)page->index << PAGE_CACHE_SHIFT) + | ||
1518 | bvec->bv_offset; | ||
1519 | end = start + bvec->bv_len - 1; | ||
1520 | |||
1521 | if (bvec->bv_offset == 0 && bvec->bv_len == PAGE_CACHE_SIZE) | ||
1522 | whole_page = 1; | ||
1523 | else | ||
1524 | whole_page = 0; | ||
1525 | |||
1526 | if (--bvec >= bio->bi_io_vec) | ||
1527 | prefetchw(&bvec->bv_page->flags); | ||
1528 | |||
1529 | if (uptodate && tree->ops && tree->ops->readpage_end_io_hook) { | ||
1530 | ret = tree->ops->readpage_end_io_hook(page, start, end); | ||
1531 | if (ret) | ||
1532 | uptodate = 0; | ||
1533 | } | ||
1534 | if (uptodate) { | ||
1535 | set_extent_uptodate(tree, start, end, GFP_ATOMIC); | ||
1536 | if (whole_page) | ||
1537 | SetPageUptodate(page); | ||
1538 | else | ||
1539 | check_page_uptodate(tree, page); | ||
1540 | } else { | ||
1541 | ClearPageUptodate(page); | ||
1542 | SetPageError(page); | ||
1543 | } | ||
1544 | |||
1545 | unlock_extent(tree, start, end, GFP_ATOMIC); | ||
1546 | |||
1547 | if (whole_page) | ||
1548 | unlock_page(page); | ||
1549 | else | ||
1550 | check_page_locked(tree, page); | ||
1551 | } while (bvec >= bio->bi_io_vec); | ||
1552 | |||
1553 | bio_put(bio); | ||
1554 | #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,23) | ||
1555 | return 0; | ||
1556 | #endif | ||
1557 | } | ||
1558 | |||
1559 | /* | ||
1560 | * IO done from prepare_write is pretty simple, we just unlock | ||
1561 | * the structs in the extent tree when done, and set the uptodate bits | ||
1562 | * as appropriate. | ||
1563 | */ | ||
1564 | #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23) | ||
1565 | static void end_bio_extent_preparewrite(struct bio *bio, int err) | ||
1566 | #else | ||
1567 | static int end_bio_extent_preparewrite(struct bio *bio, | ||
1568 | unsigned int bytes_done, int err) | ||
1569 | #endif | ||
1570 | { | ||
1571 | const int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags); | ||
1572 | struct bio_vec *bvec = bio->bi_io_vec + bio->bi_vcnt - 1; | ||
1573 | struct extent_map_tree *tree = bio->bi_private; | ||
1574 | u64 start; | ||
1575 | u64 end; | ||
1576 | |||
1577 | #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,23) | ||
1578 | if (bio->bi_size) | ||
1579 | return 1; | ||
1580 | #endif | ||
1581 | |||
1582 | do { | ||
1583 | struct page *page = bvec->bv_page; | ||
1584 | start = ((u64)page->index << PAGE_CACHE_SHIFT) + | ||
1585 | bvec->bv_offset; | ||
1586 | end = start + bvec->bv_len - 1; | ||
1587 | |||
1588 | if (--bvec >= bio->bi_io_vec) | ||
1589 | prefetchw(&bvec->bv_page->flags); | ||
1590 | |||
1591 | if (uptodate) { | ||
1592 | set_extent_uptodate(tree, start, end, GFP_ATOMIC); | ||
1593 | } else { | ||
1594 | ClearPageUptodate(page); | ||
1595 | SetPageError(page); | ||
1596 | } | ||
1597 | |||
1598 | unlock_extent(tree, start, end, GFP_ATOMIC); | ||
1599 | |||
1600 | } while (bvec >= bio->bi_io_vec); | ||
1601 | |||
1602 | bio_put(bio); | ||
1603 | #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,23) | ||
1604 | return 0; | ||
1605 | #endif | ||
1606 | } | ||
1607 | |||
1608 | static struct bio * | ||
1609 | extent_bio_alloc(struct block_device *bdev, u64 first_sector, int nr_vecs, | ||
1610 | gfp_t gfp_flags) | ||
1611 | { | ||
1612 | struct bio *bio; | ||
1613 | |||
1614 | bio = bio_alloc(gfp_flags, nr_vecs); | ||
1615 | |||
1616 | if (bio == NULL && (current->flags & PF_MEMALLOC)) { | ||
1617 | while (!bio && (nr_vecs /= 2)) | ||
1618 | bio = bio_alloc(gfp_flags, nr_vecs); | ||
1619 | } | ||
1620 | |||
1621 | if (bio) { | ||
1622 | bio->bi_bdev = bdev; | ||
1623 | bio->bi_sector = first_sector; | ||
1624 | } | ||
1625 | return bio; | ||
1626 | } | ||
1627 | |||
1628 | static int submit_one_bio(int rw, struct bio *bio) | ||
1629 | { | ||
1630 | u64 maxsector; | ||
1631 | int ret = 0; | ||
1632 | |||
1633 | bio_get(bio); | ||
1634 | |||
1635 | maxsector = bio->bi_bdev->bd_inode->i_size >> 9; | ||
1636 | if (maxsector < bio->bi_sector) { | ||
1637 | printk("sector too large max %Lu got %llu\n", maxsector, | ||
1638 | (unsigned long long)bio->bi_sector); | ||
1639 | WARN_ON(1); | ||
1640 | } | ||
1641 | |||
1642 | submit_bio(rw, bio); | ||
1643 | if (bio_flagged(bio, BIO_EOPNOTSUPP)) | ||
1644 | ret = -EOPNOTSUPP; | ||
1645 | bio_put(bio); | ||
1646 | return ret; | ||
1647 | } | ||
1648 | |||
1649 | static int submit_extent_page(int rw, struct extent_map_tree *tree, | ||
1650 | struct page *page, sector_t sector, | ||
1651 | size_t size, unsigned long offset, | ||
1652 | struct block_device *bdev, | ||
1653 | struct bio **bio_ret, | ||
1654 | unsigned long max_pages, | ||
1655 | bio_end_io_t end_io_func) | ||
1656 | { | ||
1657 | int ret = 0; | ||
1658 | struct bio *bio; | ||
1659 | int nr; | ||
1660 | |||
1661 | if (bio_ret && *bio_ret) { | ||
1662 | bio = *bio_ret; | ||
1663 | if (bio->bi_sector + (bio->bi_size >> 9) != sector || | ||
1664 | bio_add_page(bio, page, size, offset) < size) { | ||
1665 | ret = submit_one_bio(rw, bio); | ||
1666 | bio = NULL; | ||
1667 | } else { | ||
1668 | return 0; | ||
1669 | } | ||
1670 | } | ||
1671 | nr = min_t(int, max_pages, bio_get_nr_vecs(bdev)); | ||
1672 | bio = extent_bio_alloc(bdev, sector, nr, GFP_NOFS | __GFP_HIGH); | ||
1673 | if (!bio) { | ||
1674 | printk("failed to allocate bio nr %d\n", nr); | ||
1675 | } | ||
1676 | bio_add_page(bio, page, size, offset); | ||
1677 | bio->bi_end_io = end_io_func; | ||
1678 | bio->bi_private = tree; | ||
1679 | if (bio_ret) { | ||
1680 | *bio_ret = bio; | ||
1681 | } else { | ||
1682 | ret = submit_one_bio(rw, bio); | ||
1683 | } | ||
1684 | |||
1685 | return ret; | ||
1686 | } | ||
1687 | |||
1688 | void set_page_extent_mapped(struct page *page) | ||
1689 | { | ||
1690 | if (!PagePrivate(page)) { | ||
1691 | SetPagePrivate(page); | ||
1692 | WARN_ON(!page->mapping->a_ops->invalidatepage); | ||
1693 | set_page_private(page, EXTENT_PAGE_PRIVATE); | ||
1694 | page_cache_get(page); | ||
1695 | } | ||
1696 | } | ||
1697 | |||
1698 | void set_page_extent_head(struct page *page, unsigned long len) | ||
1699 | { | ||
1700 | set_page_private(page, EXTENT_PAGE_PRIVATE_FIRST_PAGE | len << 2); | ||
1701 | } | ||
1702 | |||
1703 | /* | ||
1704 | * basic readpage implementation. Locked extent state structs are inserted | ||
1705 | * into the tree that are removed when the IO is done (by the end_io | ||
1706 | * handlers) | ||
1707 | */ | ||
1708 | static int __extent_read_full_page(struct extent_map_tree *tree, | ||
1709 | struct page *page, | ||
1710 | get_extent_t *get_extent, | ||
1711 | struct bio **bio) | ||
1712 | { | ||
1713 | struct inode *inode = page->mapping->host; | ||
1714 | u64 start = (u64)page->index << PAGE_CACHE_SHIFT; | ||
1715 | u64 page_end = start + PAGE_CACHE_SIZE - 1; | ||
1716 | u64 end; | ||
1717 | u64 cur = start; | ||
1718 | u64 extent_offset; | ||
1719 | u64 last_byte = i_size_read(inode); | ||
1720 | u64 block_start; | ||
1721 | u64 cur_end; | ||
1722 | sector_t sector; | ||
1723 | struct extent_map *em; | ||
1724 | struct block_device *bdev; | ||
1725 | int ret; | ||
1726 | int nr = 0; | ||
1727 | size_t page_offset = 0; | ||
1728 | size_t iosize; | ||
1729 | size_t blocksize = inode->i_sb->s_blocksize; | ||
1730 | |||
1731 | set_page_extent_mapped(page); | ||
1732 | |||
1733 | end = page_end; | ||
1734 | lock_extent(tree, start, end, GFP_NOFS); | ||
1735 | |||
1736 | while (cur <= end) { | ||
1737 | if (cur >= last_byte) { | ||
1738 | char *userpage; | ||
1739 | iosize = PAGE_CACHE_SIZE - page_offset; | ||
1740 | userpage = kmap_atomic(page, KM_USER0); | ||
1741 | memset(userpage + page_offset, 0, iosize); | ||
1742 | flush_dcache_page(page); | ||
1743 | kunmap_atomic(userpage, KM_USER0); | ||
1744 | set_extent_uptodate(tree, cur, cur + iosize - 1, | ||
1745 | GFP_NOFS); | ||
1746 | unlock_extent(tree, cur, cur + iosize - 1, GFP_NOFS); | ||
1747 | break; | ||
1748 | } | ||
1749 | em = get_extent(inode, page, page_offset, cur, end, 0); | ||
1750 | if (IS_ERR(em) || !em) { | ||
1751 | SetPageError(page); | ||
1752 | unlock_extent(tree, cur, end, GFP_NOFS); | ||
1753 | break; | ||
1754 | } | ||
1755 | |||
1756 | extent_offset = cur - em->start; | ||
1757 | BUG_ON(em->end < cur); | ||
1758 | BUG_ON(end < cur); | ||
1759 | |||
1760 | iosize = min(em->end - cur, end - cur) + 1; | ||
1761 | cur_end = min(em->end, end); | ||
1762 | iosize = (iosize + blocksize - 1) & ~((u64)blocksize - 1); | ||
1763 | sector = (em->block_start + extent_offset) >> 9; | ||
1764 | bdev = em->bdev; | ||
1765 | block_start = em->block_start; | ||
1766 | free_extent_map(em); | ||
1767 | em = NULL; | ||
1768 | |||
1769 | /* we've found a hole, just zero and go on */ | ||
1770 | if (block_start == EXTENT_MAP_HOLE) { | ||
1771 | char *userpage; | ||
1772 | userpage = kmap_atomic(page, KM_USER0); | ||
1773 | memset(userpage + page_offset, 0, iosize); | ||
1774 | flush_dcache_page(page); | ||
1775 | kunmap_atomic(userpage, KM_USER0); | ||
1776 | |||
1777 | set_extent_uptodate(tree, cur, cur + iosize - 1, | ||
1778 | GFP_NOFS); | ||
1779 | unlock_extent(tree, cur, cur + iosize - 1, GFP_NOFS); | ||
1780 | cur = cur + iosize; | ||
1781 | page_offset += iosize; | ||
1782 | continue; | ||
1783 | } | ||
1784 | /* the get_extent function already copied into the page */ | ||
1785 | if (test_range_bit(tree, cur, cur_end, EXTENT_UPTODATE, 1)) { | ||
1786 | unlock_extent(tree, cur, cur + iosize - 1, GFP_NOFS); | ||
1787 | cur = cur + iosize; | ||
1788 | page_offset += iosize; | ||
1789 | continue; | ||
1790 | } | ||
1791 | |||
1792 | ret = 0; | ||
1793 | if (tree->ops && tree->ops->readpage_io_hook) { | ||
1794 | ret = tree->ops->readpage_io_hook(page, cur, | ||
1795 | cur + iosize - 1); | ||
1796 | } | ||
1797 | if (!ret) { | ||
1798 | unsigned long nr = (last_byte >> PAGE_CACHE_SHIFT) + 1; | ||
1799 | nr -= page->index; | ||
1800 | ret = submit_extent_page(READ, tree, page, | ||
1801 | sector, iosize, page_offset, | ||
1802 | bdev, bio, nr, | ||
1803 | end_bio_extent_readpage); | ||
1804 | } | ||
1805 | if (ret) | ||
1806 | SetPageError(page); | ||
1807 | cur = cur + iosize; | ||
1808 | page_offset += iosize; | ||
1809 | nr++; | ||
1810 | } | ||
1811 | if (!nr) { | ||
1812 | if (!PageError(page)) | ||
1813 | SetPageUptodate(page); | ||
1814 | unlock_page(page); | ||
1815 | } | ||
1816 | return 0; | ||
1817 | } | ||
1818 | |||
1819 | int extent_read_full_page(struct extent_map_tree *tree, struct page *page, | ||
1820 | get_extent_t *get_extent) | ||
1821 | { | ||
1822 | struct bio *bio = NULL; | ||
1823 | int ret; | ||
1824 | |||
1825 | ret = __extent_read_full_page(tree, page, get_extent, &bio); | ||
1826 | if (bio) | ||
1827 | submit_one_bio(READ, bio); | ||
1828 | return ret; | ||
1829 | } | ||
1830 | EXPORT_SYMBOL(extent_read_full_page); | ||
1831 | |||
1832 | /* | ||
1833 | * the writepage semantics are similar to regular writepage. extent | ||
1834 | * records are inserted to lock ranges in the tree, and as dirty areas | ||
1835 | * are found, they are marked writeback. Then the lock bits are removed | ||
1836 | * and the end_io handler clears the writeback ranges | ||
1837 | */ | ||
1838 | static int __extent_writepage(struct page *page, struct writeback_control *wbc, | ||
1839 | void *data) | ||
1840 | { | ||
1841 | struct inode *inode = page->mapping->host; | ||
1842 | struct extent_page_data *epd = data; | ||
1843 | struct extent_map_tree *tree = epd->tree; | ||
1844 | u64 start = (u64)page->index << PAGE_CACHE_SHIFT; | ||
1845 | u64 delalloc_start; | ||
1846 | u64 page_end = start + PAGE_CACHE_SIZE - 1; | ||
1847 | u64 end; | ||
1848 | u64 cur = start; | ||
1849 | u64 extent_offset; | ||
1850 | u64 last_byte = i_size_read(inode); | ||
1851 | u64 block_start; | ||
1852 | u64 iosize; | ||
1853 | sector_t sector; | ||
1854 | struct extent_map *em; | ||
1855 | struct block_device *bdev; | ||
1856 | int ret; | ||
1857 | int nr = 0; | ||
1858 | size_t page_offset = 0; | ||
1859 | size_t blocksize; | ||
1860 | loff_t i_size = i_size_read(inode); | ||
1861 | unsigned long end_index = i_size >> PAGE_CACHE_SHIFT; | ||
1862 | u64 nr_delalloc; | ||
1863 | u64 delalloc_end; | ||
1864 | |||
1865 | WARN_ON(!PageLocked(page)); | ||
1866 | if (page->index > end_index) { | ||
1867 | clear_extent_dirty(tree, start, page_end, GFP_NOFS); | ||
1868 | unlock_page(page); | ||
1869 | return 0; | ||
1870 | } | ||
1871 | |||
1872 | if (page->index == end_index) { | ||
1873 | char *userpage; | ||
1874 | |||
1875 | size_t offset = i_size & (PAGE_CACHE_SIZE - 1); | ||
1876 | |||
1877 | userpage = kmap_atomic(page, KM_USER0); | ||
1878 | memset(userpage + offset, 0, PAGE_CACHE_SIZE - offset); | ||
1879 | flush_dcache_page(page); | ||
1880 | kunmap_atomic(userpage, KM_USER0); | ||
1881 | } | ||
1882 | |||
1883 | set_page_extent_mapped(page); | ||
1884 | |||
1885 | delalloc_start = start; | ||
1886 | delalloc_end = 0; | ||
1887 | while(delalloc_end < page_end) { | ||
1888 | nr_delalloc = find_lock_delalloc_range(tree, &delalloc_start, | ||
1889 | &delalloc_end, | ||
1890 | 128 * 1024 * 1024); | ||
1891 | if (nr_delalloc == 0) { | ||
1892 | delalloc_start = delalloc_end + 1; | ||
1893 | continue; | ||
1894 | } | ||
1895 | tree->ops->fill_delalloc(inode, delalloc_start, | ||
1896 | delalloc_end); | ||
1897 | clear_extent_bit(tree, delalloc_start, | ||
1898 | delalloc_end, | ||
1899 | EXTENT_LOCKED | EXTENT_DELALLOC, | ||
1900 | 1, 0, GFP_NOFS); | ||
1901 | delalloc_start = delalloc_end + 1; | ||
1902 | } | ||
1903 | lock_extent(tree, start, page_end, GFP_NOFS); | ||
1904 | |||
1905 | end = page_end; | ||
1906 | if (test_range_bit(tree, start, page_end, EXTENT_DELALLOC, 0)) { | ||
1907 | printk("found delalloc bits after lock_extent\n"); | ||
1908 | } | ||
1909 | |||
1910 | if (last_byte <= start) { | ||
1911 | clear_extent_dirty(tree, start, page_end, GFP_NOFS); | ||
1912 | goto done; | ||
1913 | } | ||
1914 | |||
1915 | set_extent_uptodate(tree, start, page_end, GFP_NOFS); | ||
1916 | blocksize = inode->i_sb->s_blocksize; | ||
1917 | |||
1918 | while (cur <= end) { | ||
1919 | if (cur >= last_byte) { | ||
1920 | clear_extent_dirty(tree, cur, page_end, GFP_NOFS); | ||
1921 | break; | ||
1922 | } | ||
1923 | em = epd->get_extent(inode, page, page_offset, cur, end, 1); | ||
1924 | if (IS_ERR(em) || !em) { | ||
1925 | SetPageError(page); | ||
1926 | break; | ||
1927 | } | ||
1928 | |||
1929 | extent_offset = cur - em->start; | ||
1930 | BUG_ON(em->end < cur); | ||
1931 | BUG_ON(end < cur); | ||
1932 | iosize = min(em->end - cur, end - cur) + 1; | ||
1933 | iosize = (iosize + blocksize - 1) & ~((u64)blocksize - 1); | ||
1934 | sector = (em->block_start + extent_offset) >> 9; | ||
1935 | bdev = em->bdev; | ||
1936 | block_start = em->block_start; | ||
1937 | free_extent_map(em); | ||
1938 | em = NULL; | ||
1939 | |||
1940 | if (block_start == EXTENT_MAP_HOLE || | ||
1941 | block_start == EXTENT_MAP_INLINE) { | ||
1942 | clear_extent_dirty(tree, cur, | ||
1943 | cur + iosize - 1, GFP_NOFS); | ||
1944 | cur = cur + iosize; | ||
1945 | page_offset += iosize; | ||
1946 | continue; | ||
1947 | } | ||
1948 | |||
1949 | /* leave this out until we have a page_mkwrite call */ | ||
1950 | if (0 && !test_range_bit(tree, cur, cur + iosize - 1, | ||
1951 | EXTENT_DIRTY, 0)) { | ||
1952 | cur = cur + iosize; | ||
1953 | page_offset += iosize; | ||
1954 | continue; | ||
1955 | } | ||
1956 | clear_extent_dirty(tree, cur, cur + iosize - 1, GFP_NOFS); | ||
1957 | if (tree->ops && tree->ops->writepage_io_hook) { | ||
1958 | ret = tree->ops->writepage_io_hook(page, cur, | ||
1959 | cur + iosize - 1); | ||
1960 | } else { | ||
1961 | ret = 0; | ||
1962 | } | ||
1963 | if (ret) | ||
1964 | SetPageError(page); | ||
1965 | else { | ||
1966 | unsigned long max_nr = end_index + 1; | ||
1967 | set_range_writeback(tree, cur, cur + iosize - 1); | ||
1968 | if (!PageWriteback(page)) { | ||
1969 | printk("warning page %lu not writeback, " | ||
1970 | "cur %llu end %llu\n", page->index, | ||
1971 | (unsigned long long)cur, | ||
1972 | (unsigned long long)end); | ||
1973 | } | ||
1974 | |||
1975 | ret = submit_extent_page(WRITE, tree, page, sector, | ||
1976 | iosize, page_offset, bdev, | ||
1977 | &epd->bio, max_nr, | ||
1978 | end_bio_extent_writepage); | ||
1979 | if (ret) | ||
1980 | SetPageError(page); | ||
1981 | } | ||
1982 | cur = cur + iosize; | ||
1983 | page_offset += iosize; | ||
1984 | nr++; | ||
1985 | } | ||
1986 | done: | ||
1987 | if (nr == 0) { | ||
1988 | /* make sure the mapping tag for page dirty gets cleared */ | ||
1989 | set_page_writeback(page); | ||
1990 | end_page_writeback(page); | ||
1991 | } | ||
1992 | unlock_extent(tree, start, page_end, GFP_NOFS); | ||
1993 | unlock_page(page); | ||
1994 | return 0; | ||
1995 | } | ||
1996 | |||
1997 | #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18) | ||
1998 | |||
1999 | /* Taken directly from 2.6.23 for 2.6.18 back port */ | ||
2000 | typedef int (*writepage_t)(struct page *page, struct writeback_control *wbc, | ||
2001 | void *data); | ||
2002 | |||
2003 | /** | ||
2004 | * write_cache_pages - walk the list of dirty pages of the given address space | ||
2005 | * and write all of them. | ||
2006 | * @mapping: address space structure to write | ||
2007 | * @wbc: subtract the number of written pages from *@wbc->nr_to_write | ||
2008 | * @writepage: function called for each page | ||
2009 | * @data: data passed to writepage function | ||
2010 | * | ||
2011 | * If a page is already under I/O, write_cache_pages() skips it, even | ||
2012 | * if it's dirty. This is desirable behaviour for memory-cleaning writeback, | ||
2013 | * but it is INCORRECT for data-integrity system calls such as fsync(). fsync() | ||
2014 | * and msync() need to guarantee that all the data which was dirty at the time | ||
2015 | * the call was made get new I/O started against them. If wbc->sync_mode is | ||
2016 | * WB_SYNC_ALL then we were called for data integrity and we must wait for | ||
2017 | * existing IO to complete. | ||
2018 | */ | ||
2019 | static int write_cache_pages(struct address_space *mapping, | ||
2020 | struct writeback_control *wbc, writepage_t writepage, | ||
2021 | void *data) | ||
2022 | { | ||
2023 | struct backing_dev_info *bdi = mapping->backing_dev_info; | ||
2024 | int ret = 0; | ||
2025 | int done = 0; | ||
2026 | struct pagevec pvec; | ||
2027 | int nr_pages; | ||
2028 | pgoff_t index; | ||
2029 | pgoff_t end; /* Inclusive */ | ||
2030 | int scanned = 0; | ||
2031 | int range_whole = 0; | ||
2032 | |||
2033 | if (wbc->nonblocking && bdi_write_congested(bdi)) { | ||
2034 | wbc->encountered_congestion = 1; | ||
2035 | return 0; | ||
2036 | } | ||
2037 | |||
2038 | pagevec_init(&pvec, 0); | ||
2039 | if (wbc->range_cyclic) { | ||
2040 | index = mapping->writeback_index; /* Start from prev offset */ | ||
2041 | end = -1; | ||
2042 | } else { | ||
2043 | index = wbc->range_start >> PAGE_CACHE_SHIFT; | ||
2044 | end = wbc->range_end >> PAGE_CACHE_SHIFT; | ||
2045 | if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX) | ||
2046 | range_whole = 1; | ||
2047 | scanned = 1; | ||
2048 | } | ||
2049 | retry: | ||
2050 | while (!done && (index <= end) && | ||
2051 | (nr_pages = pagevec_lookup_tag(&pvec, mapping, &index, | ||
2052 | PAGECACHE_TAG_DIRTY, | ||
2053 | min(end - index, (pgoff_t)PAGEVEC_SIZE-1) + 1))) { | ||
2054 | unsigned i; | ||
2055 | |||
2056 | scanned = 1; | ||
2057 | for (i = 0; i < nr_pages; i++) { | ||
2058 | struct page *page = pvec.pages[i]; | ||
2059 | |||
2060 | /* | ||
2061 | * At this point we hold neither mapping->tree_lock nor | ||
2062 | * lock on the page itself: the page may be truncated or | ||
2063 | * invalidated (changing page->mapping to NULL), or even | ||
2064 | * swizzled back from swapper_space to tmpfs file | ||
2065 | * mapping | ||
2066 | */ | ||
2067 | lock_page(page); | ||
2068 | |||
2069 | if (unlikely(page->mapping != mapping)) { | ||
2070 | unlock_page(page); | ||
2071 | continue; | ||
2072 | } | ||
2073 | |||
2074 | if (!wbc->range_cyclic && page->index > end) { | ||
2075 | done = 1; | ||
2076 | unlock_page(page); | ||
2077 | continue; | ||
2078 | } | ||
2079 | |||
2080 | if (wbc->sync_mode != WB_SYNC_NONE) | ||
2081 | wait_on_page_writeback(page); | ||
2082 | |||
2083 | if (PageWriteback(page) || | ||
2084 | !clear_page_dirty_for_io(page)) { | ||
2085 | unlock_page(page); | ||
2086 | continue; | ||
2087 | } | ||
2088 | |||
2089 | ret = (*writepage)(page, wbc, data); | ||
2090 | |||
2091 | if (unlikely(ret == AOP_WRITEPAGE_ACTIVATE)) { | ||
2092 | unlock_page(page); | ||
2093 | ret = 0; | ||
2094 | } | ||
2095 | if (ret || (--(wbc->nr_to_write) <= 0)) | ||
2096 | done = 1; | ||
2097 | if (wbc->nonblocking && bdi_write_congested(bdi)) { | ||
2098 | wbc->encountered_congestion = 1; | ||
2099 | done = 1; | ||
2100 | } | ||
2101 | } | ||
2102 | pagevec_release(&pvec); | ||
2103 | cond_resched(); | ||
2104 | } | ||
2105 | if (!scanned && !done) { | ||
2106 | /* | ||
2107 | * We hit the last page and there is more work to be done: wrap | ||
2108 | * back to the start of the file | ||
2109 | */ | ||
2110 | scanned = 1; | ||
2111 | index = 0; | ||
2112 | goto retry; | ||
2113 | } | ||
2114 | if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0)) | ||
2115 | mapping->writeback_index = index; | ||
2116 | return ret; | ||
2117 | } | ||
2118 | #endif | ||
2119 | |||
2120 | int extent_write_full_page(struct extent_map_tree *tree, struct page *page, | ||
2121 | get_extent_t *get_extent, | ||
2122 | struct writeback_control *wbc) | ||
2123 | { | ||
2124 | int ret; | ||
2125 | struct address_space *mapping = page->mapping; | ||
2126 | struct extent_page_data epd = { | ||
2127 | .bio = NULL, | ||
2128 | .tree = tree, | ||
2129 | .get_extent = get_extent, | ||
2130 | }; | ||
2131 | struct writeback_control wbc_writepages = { | ||
2132 | .bdi = wbc->bdi, | ||
2133 | .sync_mode = WB_SYNC_NONE, | ||
2134 | .older_than_this = NULL, | ||
2135 | .nr_to_write = 64, | ||
2136 | .range_start = page_offset(page) + PAGE_CACHE_SIZE, | ||
2137 | .range_end = (loff_t)-1, | ||
2138 | }; | ||
2139 | |||
2140 | |||
2141 | ret = __extent_writepage(page, wbc, &epd); | ||
2142 | |||
2143 | write_cache_pages(mapping, &wbc_writepages, __extent_writepage, &epd); | ||
2144 | if (epd.bio) { | ||
2145 | submit_one_bio(WRITE, epd.bio); | ||
2146 | } | ||
2147 | return ret; | ||
2148 | } | ||
2149 | EXPORT_SYMBOL(extent_write_full_page); | ||
2150 | |||
2151 | |||
2152 | int extent_writepages(struct extent_map_tree *tree, | ||
2153 | struct address_space *mapping, | ||
2154 | get_extent_t *get_extent, | ||
2155 | struct writeback_control *wbc) | ||
2156 | { | ||
2157 | int ret = 0; | 276 | int ret = 0; |
2158 | struct extent_page_data epd = { | ||
2159 | .bio = NULL, | ||
2160 | .tree = tree, | ||
2161 | .get_extent = get_extent, | ||
2162 | }; | ||
2163 | |||
2164 | ret = write_cache_pages(mapping, wbc, __extent_writepage, &epd); | ||
2165 | if (epd.bio) { | ||
2166 | submit_one_bio(WRITE, epd.bio); | ||
2167 | } | ||
2168 | return ret; | ||
2169 | } | ||
2170 | EXPORT_SYMBOL(extent_writepages); | ||
2171 | |||
2172 | int extent_readpages(struct extent_map_tree *tree, | ||
2173 | struct address_space *mapping, | ||
2174 | struct list_head *pages, unsigned nr_pages, | ||
2175 | get_extent_t get_extent) | ||
2176 | { | ||
2177 | struct bio *bio = NULL; | ||
2178 | unsigned page_idx; | ||
2179 | struct pagevec pvec; | ||
2180 | |||
2181 | pagevec_init(&pvec, 0); | ||
2182 | for (page_idx = 0; page_idx < nr_pages; page_idx++) { | ||
2183 | struct page *page = list_entry(pages->prev, struct page, lru); | ||
2184 | |||
2185 | prefetchw(&page->flags); | ||
2186 | list_del(&page->lru); | ||
2187 | /* | ||
2188 | * what we want to do here is call add_to_page_cache_lru, | ||
2189 | * but that isn't exported, so we reproduce it here | ||
2190 | */ | ||
2191 | if (!add_to_page_cache(page, mapping, | ||
2192 | page->index, GFP_KERNEL)) { | ||
2193 | |||
2194 | /* open coding of lru_cache_add, also not exported */ | ||
2195 | page_cache_get(page); | ||
2196 | if (!pagevec_add(&pvec, page)) | ||
2197 | __pagevec_lru_add(&pvec); | ||
2198 | __extent_read_full_page(tree, page, get_extent, &bio); | ||
2199 | } | ||
2200 | page_cache_release(page); | ||
2201 | } | ||
2202 | if (pagevec_count(&pvec)) | ||
2203 | __pagevec_lru_add(&pvec); | ||
2204 | BUG_ON(!list_empty(pages)); | ||
2205 | if (bio) | ||
2206 | submit_one_bio(READ, bio); | ||
2207 | return 0; | ||
2208 | } | ||
2209 | EXPORT_SYMBOL(extent_readpages); | ||
2210 | |||
2211 | /* | ||
2212 | * basic invalidatepage code, this waits on any locked or writeback | ||
2213 | * ranges corresponding to the page, and then deletes any extent state | ||
2214 | * records from the tree | ||
2215 | */ | ||
2216 | int extent_invalidatepage(struct extent_map_tree *tree, | ||
2217 | struct page *page, unsigned long offset) | ||
2218 | { | ||
2219 | u64 start = ((u64)page->index << PAGE_CACHE_SHIFT); | ||
2220 | u64 end = start + PAGE_CACHE_SIZE - 1; | ||
2221 | size_t blocksize = page->mapping->host->i_sb->s_blocksize; | ||
2222 | |||
2223 | start += (offset + blocksize -1) & ~(blocksize - 1); | ||
2224 | if (start > end) | ||
2225 | return 0; | ||
2226 | |||
2227 | lock_extent(tree, start, end, GFP_NOFS); | ||
2228 | wait_on_extent_writeback(tree, start, end); | ||
2229 | clear_extent_bit(tree, start, end, | ||
2230 | EXTENT_LOCKED | EXTENT_DIRTY | EXTENT_DELALLOC, | ||
2231 | 1, 1, GFP_NOFS); | ||
2232 | return 0; | ||
2233 | } | ||
2234 | EXPORT_SYMBOL(extent_invalidatepage); | ||
2235 | |||
2236 | /* | ||
2237 | * simple commit_write call, set_range_dirty is used to mark both | ||
2238 | * the pages and the extent records as dirty | ||
2239 | */ | ||
2240 | int extent_commit_write(struct extent_map_tree *tree, | ||
2241 | struct inode *inode, struct page *page, | ||
2242 | unsigned from, unsigned to) | ||
2243 | { | ||
2244 | loff_t pos = ((loff_t)page->index << PAGE_CACHE_SHIFT) + to; | ||
2245 | |||
2246 | set_page_extent_mapped(page); | ||
2247 | set_page_dirty(page); | ||
2248 | |||
2249 | if (pos > inode->i_size) { | ||
2250 | i_size_write(inode, pos); | ||
2251 | mark_inode_dirty(inode); | ||
2252 | } | ||
2253 | return 0; | ||
2254 | } | ||
2255 | EXPORT_SYMBOL(extent_commit_write); | ||
2256 | |||
2257 | int extent_prepare_write(struct extent_map_tree *tree, | ||
2258 | struct inode *inode, struct page *page, | ||
2259 | unsigned from, unsigned to, get_extent_t *get_extent) | ||
2260 | { | ||
2261 | u64 page_start = (u64)page->index << PAGE_CACHE_SHIFT; | ||
2262 | u64 page_end = page_start + PAGE_CACHE_SIZE - 1; | ||
2263 | u64 block_start; | ||
2264 | u64 orig_block_start; | ||
2265 | u64 block_end; | ||
2266 | u64 cur_end; | ||
2267 | struct extent_map *em; | ||
2268 | unsigned blocksize = 1 << inode->i_blkbits; | ||
2269 | size_t page_offset = 0; | ||
2270 | size_t block_off_start; | ||
2271 | size_t block_off_end; | ||
2272 | int err = 0; | ||
2273 | int iocount = 0; | ||
2274 | int ret = 0; | ||
2275 | int isnew; | ||
2276 | |||
2277 | set_page_extent_mapped(page); | ||
2278 | |||
2279 | block_start = (page_start + from) & ~((u64)blocksize - 1); | ||
2280 | block_end = (page_start + to - 1) | (blocksize - 1); | ||
2281 | orig_block_start = block_start; | ||
2282 | |||
2283 | lock_extent(tree, page_start, page_end, GFP_NOFS); | ||
2284 | while(block_start <= block_end) { | ||
2285 | em = get_extent(inode, page, page_offset, block_start, | ||
2286 | block_end, 1); | ||
2287 | if (IS_ERR(em) || !em) { | ||
2288 | goto err; | ||
2289 | } | ||
2290 | cur_end = min(block_end, em->end); | ||
2291 | block_off_start = block_start & (PAGE_CACHE_SIZE - 1); | ||
2292 | block_off_end = block_off_start + blocksize; | ||
2293 | isnew = clear_extent_new(tree, block_start, cur_end, GFP_NOFS); | ||
2294 | |||
2295 | if (!PageUptodate(page) && isnew && | ||
2296 | (block_off_end > to || block_off_start < from)) { | ||
2297 | void *kaddr; | ||
2298 | |||
2299 | kaddr = kmap_atomic(page, KM_USER0); | ||
2300 | if (block_off_end > to) | ||
2301 | memset(kaddr + to, 0, block_off_end - to); | ||
2302 | if (block_off_start < from) | ||
2303 | memset(kaddr + block_off_start, 0, | ||
2304 | from - block_off_start); | ||
2305 | flush_dcache_page(page); | ||
2306 | kunmap_atomic(kaddr, KM_USER0); | ||
2307 | } | ||
2308 | if ((em->block_start != EXTENT_MAP_HOLE && | ||
2309 | em->block_start != EXTENT_MAP_INLINE) && | ||
2310 | !isnew && !PageUptodate(page) && | ||
2311 | (block_off_end > to || block_off_start < from) && | ||
2312 | !test_range_bit(tree, block_start, cur_end, | ||
2313 | EXTENT_UPTODATE, 1)) { | ||
2314 | u64 sector; | ||
2315 | u64 extent_offset = block_start - em->start; | ||
2316 | size_t iosize; | ||
2317 | sector = (em->block_start + extent_offset) >> 9; | ||
2318 | iosize = (cur_end - block_start + blocksize) & | ||
2319 | ~((u64)blocksize - 1); | ||
2320 | /* | ||
2321 | * we've already got the extent locked, but we | ||
2322 | * need to split the state such that our end_bio | ||
2323 | * handler can clear the lock. | ||
2324 | */ | ||
2325 | set_extent_bit(tree, block_start, | ||
2326 | block_start + iosize - 1, | ||
2327 | EXTENT_LOCKED, 0, NULL, GFP_NOFS); | ||
2328 | ret = submit_extent_page(READ, tree, page, | ||
2329 | sector, iosize, page_offset, em->bdev, | ||
2330 | NULL, 1, | ||
2331 | end_bio_extent_preparewrite); | ||
2332 | iocount++; | ||
2333 | block_start = block_start + iosize; | ||
2334 | } else { | ||
2335 | set_extent_uptodate(tree, block_start, cur_end, | ||
2336 | GFP_NOFS); | ||
2337 | unlock_extent(tree, block_start, cur_end, GFP_NOFS); | ||
2338 | block_start = cur_end + 1; | ||
2339 | } | ||
2340 | page_offset = block_start & (PAGE_CACHE_SIZE - 1); | ||
2341 | free_extent_map(em); | ||
2342 | } | ||
2343 | if (iocount) { | ||
2344 | wait_extent_bit(tree, orig_block_start, | ||
2345 | block_end, EXTENT_LOCKED); | ||
2346 | } | ||
2347 | check_page_uptodate(tree, page); | ||
2348 | err: | ||
2349 | /* FIXME, zero out newly allocated blocks on error */ | ||
2350 | return err; | ||
2351 | } | ||
2352 | EXPORT_SYMBOL(extent_prepare_write); | ||
2353 | |||
2354 | /* | ||
2355 | * a helper for releasepage. As long as there are no locked extents | ||
2356 | * in the range corresponding to the page, both state records and extent | ||
2357 | * map records are removed | ||
2358 | */ | ||
2359 | int try_release_extent_mapping(struct extent_map_tree *tree, struct page *page) | ||
2360 | { | ||
2361 | struct extent_map *em; | ||
2362 | u64 start = (u64)page->index << PAGE_CACHE_SHIFT; | ||
2363 | u64 end = start + PAGE_CACHE_SIZE - 1; | ||
2364 | u64 orig_start = start; | ||
2365 | int ret = 1; | ||
2366 | |||
2367 | while (start <= end) { | ||
2368 | em = lookup_extent_mapping(tree, start, end); | ||
2369 | if (!em || IS_ERR(em)) | ||
2370 | break; | ||
2371 | if (!test_range_bit(tree, em->start, em->end, | ||
2372 | EXTENT_LOCKED, 0)) { | ||
2373 | remove_extent_mapping(tree, em); | ||
2374 | /* once for the rb tree */ | ||
2375 | free_extent_map(em); | ||
2376 | } | ||
2377 | start = em->end + 1; | ||
2378 | /* once for us */ | ||
2379 | free_extent_map(em); | ||
2380 | } | ||
2381 | if (test_range_bit(tree, orig_start, end, EXTENT_LOCKED, 0)) | ||
2382 | ret = 0; | ||
2383 | else | ||
2384 | clear_extent_bit(tree, orig_start, end, EXTENT_UPTODATE, | ||
2385 | 1, 1, GFP_NOFS); | ||
2386 | return ret; | ||
2387 | } | ||
2388 | EXPORT_SYMBOL(try_release_extent_mapping); | ||
2389 | |||
2390 | sector_t extent_bmap(struct address_space *mapping, sector_t iblock, | ||
2391 | get_extent_t *get_extent) | ||
2392 | { | ||
2393 | struct inode *inode = mapping->host; | ||
2394 | u64 start = iblock << inode->i_blkbits; | ||
2395 | u64 end = start + (1 << inode->i_blkbits) - 1; | ||
2396 | sector_t sector = 0; | ||
2397 | struct extent_map *em; | ||
2398 | |||
2399 | em = get_extent(inode, NULL, 0, start, end, 0); | ||
2400 | if (!em || IS_ERR(em)) | ||
2401 | return 0; | ||
2402 | |||
2403 | if (em->block_start == EXTENT_MAP_INLINE || | ||
2404 | em->block_start == EXTENT_MAP_HOLE) | ||
2405 | goto out; | ||
2406 | |||
2407 | sector = (em->block_start + start - em->start) >> inode->i_blkbits; | ||
2408 | out: | ||
2409 | free_extent_map(em); | ||
2410 | return sector; | ||
2411 | } | ||
2412 | |||
2413 | static int add_lru(struct extent_map_tree *tree, struct extent_buffer *eb) | ||
2414 | { | ||
2415 | if (list_empty(&eb->lru)) { | ||
2416 | extent_buffer_get(eb); | ||
2417 | list_add(&eb->lru, &tree->buffer_lru); | ||
2418 | tree->lru_size++; | ||
2419 | if (tree->lru_size >= BUFFER_LRU_MAX) { | ||
2420 | struct extent_buffer *rm; | ||
2421 | rm = list_entry(tree->buffer_lru.prev, | ||
2422 | struct extent_buffer, lru); | ||
2423 | tree->lru_size--; | ||
2424 | list_del_init(&rm->lru); | ||
2425 | free_extent_buffer(rm); | ||
2426 | } | ||
2427 | } else | ||
2428 | list_move(&eb->lru, &tree->buffer_lru); | ||
2429 | return 0; | ||
2430 | } | ||
2431 | static struct extent_buffer *find_lru(struct extent_map_tree *tree, | ||
2432 | u64 start, unsigned long len) | ||
2433 | { | ||
2434 | struct list_head *lru = &tree->buffer_lru; | ||
2435 | struct list_head *cur = lru->next; | ||
2436 | struct extent_buffer *eb; | ||
2437 | |||
2438 | if (list_empty(lru)) | ||
2439 | return NULL; | ||
2440 | |||
2441 | do { | ||
2442 | eb = list_entry(cur, struct extent_buffer, lru); | ||
2443 | if (eb->start == start && eb->len == len) { | ||
2444 | extent_buffer_get(eb); | ||
2445 | return eb; | ||
2446 | } | ||
2447 | cur = cur->next; | ||
2448 | } while (cur != lru); | ||
2449 | return NULL; | ||
2450 | } | ||
2451 | |||
2452 | static inline unsigned long num_extent_pages(u64 start, u64 len) | ||
2453 | { | ||
2454 | return ((start + len + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT) - | ||
2455 | (start >> PAGE_CACHE_SHIFT); | ||
2456 | } | ||
2457 | |||
2458 | static inline struct page *extent_buffer_page(struct extent_buffer *eb, | ||
2459 | unsigned long i) | ||
2460 | { | ||
2461 | struct page *p; | ||
2462 | struct address_space *mapping; | ||
2463 | |||
2464 | if (i == 0) | ||
2465 | return eb->first_page; | ||
2466 | i += eb->start >> PAGE_CACHE_SHIFT; | ||
2467 | mapping = eb->first_page->mapping; | ||
2468 | read_lock_irq(&mapping->tree_lock); | ||
2469 | p = radix_tree_lookup(&mapping->page_tree, i); | ||
2470 | read_unlock_irq(&mapping->tree_lock); | ||
2471 | return p; | ||
2472 | } | ||
2473 | |||
2474 | static struct extent_buffer *__alloc_extent_buffer(struct extent_map_tree *tree, | ||
2475 | u64 start, | ||
2476 | unsigned long len, | ||
2477 | gfp_t mask) | ||
2478 | { | ||
2479 | struct extent_buffer *eb = NULL; | ||
2480 | 277 | ||
2481 | spin_lock(&tree->lru_lock); | 278 | rb_erase(&em->rb_node, &tree->map); |
2482 | eb = find_lru(tree, start, len); | 279 | em->in_tree = 0; |
2483 | spin_unlock(&tree->lru_lock); | 280 | if (tree->last == em) |
2484 | if (eb) { | 281 | tree->last = NULL; |
2485 | return eb; | ||
2486 | } | ||
2487 | |||
2488 | eb = kmem_cache_zalloc(extent_buffer_cache, mask); | ||
2489 | INIT_LIST_HEAD(&eb->lru); | ||
2490 | eb->start = start; | ||
2491 | eb->len = len; | ||
2492 | atomic_set(&eb->refs, 1); | ||
2493 | |||
2494 | return eb; | ||
2495 | } | ||
2496 | |||
2497 | static void __free_extent_buffer(struct extent_buffer *eb) | ||
2498 | { | ||
2499 | kmem_cache_free(extent_buffer_cache, eb); | ||
2500 | } | ||
2501 | |||
2502 | struct extent_buffer *alloc_extent_buffer(struct extent_map_tree *tree, | ||
2503 | u64 start, unsigned long len, | ||
2504 | struct page *page0, | ||
2505 | gfp_t mask) | ||
2506 | { | ||
2507 | unsigned long num_pages = num_extent_pages(start, len); | ||
2508 | unsigned long i; | ||
2509 | unsigned long index = start >> PAGE_CACHE_SHIFT; | ||
2510 | struct extent_buffer *eb; | ||
2511 | struct page *p; | ||
2512 | struct address_space *mapping = tree->mapping; | ||
2513 | int uptodate = 1; | ||
2514 | |||
2515 | eb = __alloc_extent_buffer(tree, start, len, mask); | ||
2516 | if (!eb || IS_ERR(eb)) | ||
2517 | return NULL; | ||
2518 | |||
2519 | if (eb->flags & EXTENT_BUFFER_FILLED) | ||
2520 | goto lru_add; | ||
2521 | |||
2522 | if (page0) { | ||
2523 | eb->first_page = page0; | ||
2524 | i = 1; | ||
2525 | index++; | ||
2526 | page_cache_get(page0); | ||
2527 | mark_page_accessed(page0); | ||
2528 | set_page_extent_mapped(page0); | ||
2529 | WARN_ON(!PageUptodate(page0)); | ||
2530 | set_page_extent_head(page0, len); | ||
2531 | } else { | ||
2532 | i = 0; | ||
2533 | } | ||
2534 | for (; i < num_pages; i++, index++) { | ||
2535 | p = find_or_create_page(mapping, index, mask | __GFP_HIGHMEM); | ||
2536 | if (!p) { | ||
2537 | WARN_ON(1); | ||
2538 | goto fail; | ||
2539 | } | ||
2540 | set_page_extent_mapped(p); | ||
2541 | mark_page_accessed(p); | ||
2542 | if (i == 0) { | ||
2543 | eb->first_page = p; | ||
2544 | set_page_extent_head(p, len); | ||
2545 | } else { | ||
2546 | set_page_private(p, EXTENT_PAGE_PRIVATE); | ||
2547 | } | ||
2548 | if (!PageUptodate(p)) | ||
2549 | uptodate = 0; | ||
2550 | unlock_page(p); | ||
2551 | } | ||
2552 | if (uptodate) | ||
2553 | eb->flags |= EXTENT_UPTODATE; | ||
2554 | eb->flags |= EXTENT_BUFFER_FILLED; | ||
2555 | |||
2556 | lru_add: | ||
2557 | spin_lock(&tree->lru_lock); | ||
2558 | add_lru(tree, eb); | ||
2559 | spin_unlock(&tree->lru_lock); | ||
2560 | return eb; | ||
2561 | |||
2562 | fail: | ||
2563 | spin_lock(&tree->lru_lock); | ||
2564 | list_del_init(&eb->lru); | ||
2565 | spin_unlock(&tree->lru_lock); | ||
2566 | if (!atomic_dec_and_test(&eb->refs)) | ||
2567 | return NULL; | ||
2568 | for (index = 1; index < i; index++) { | ||
2569 | page_cache_release(extent_buffer_page(eb, index)); | ||
2570 | } | ||
2571 | if (i > 0) | ||
2572 | page_cache_release(extent_buffer_page(eb, 0)); | ||
2573 | __free_extent_buffer(eb); | ||
2574 | return NULL; | ||
2575 | } | ||
2576 | EXPORT_SYMBOL(alloc_extent_buffer); | ||
2577 | |||
2578 | struct extent_buffer *find_extent_buffer(struct extent_map_tree *tree, | ||
2579 | u64 start, unsigned long len, | ||
2580 | gfp_t mask) | ||
2581 | { | ||
2582 | unsigned long num_pages = num_extent_pages(start, len); | ||
2583 | unsigned long i; | ||
2584 | unsigned long index = start >> PAGE_CACHE_SHIFT; | ||
2585 | struct extent_buffer *eb; | ||
2586 | struct page *p; | ||
2587 | struct address_space *mapping = tree->mapping; | ||
2588 | int uptodate = 1; | ||
2589 | |||
2590 | eb = __alloc_extent_buffer(tree, start, len, mask); | ||
2591 | if (!eb || IS_ERR(eb)) | ||
2592 | return NULL; | ||
2593 | |||
2594 | if (eb->flags & EXTENT_BUFFER_FILLED) | ||
2595 | goto lru_add; | ||
2596 | |||
2597 | for (i = 0; i < num_pages; i++, index++) { | ||
2598 | p = find_lock_page(mapping, index); | ||
2599 | if (!p) { | ||
2600 | goto fail; | ||
2601 | } | ||
2602 | set_page_extent_mapped(p); | ||
2603 | mark_page_accessed(p); | ||
2604 | |||
2605 | if (i == 0) { | ||
2606 | eb->first_page = p; | ||
2607 | set_page_extent_head(p, len); | ||
2608 | } else { | ||
2609 | set_page_private(p, EXTENT_PAGE_PRIVATE); | ||
2610 | } | ||
2611 | |||
2612 | if (!PageUptodate(p)) | ||
2613 | uptodate = 0; | ||
2614 | unlock_page(p); | ||
2615 | } | ||
2616 | if (uptodate) | ||
2617 | eb->flags |= EXTENT_UPTODATE; | ||
2618 | eb->flags |= EXTENT_BUFFER_FILLED; | ||
2619 | |||
2620 | lru_add: | ||
2621 | spin_lock(&tree->lru_lock); | ||
2622 | add_lru(tree, eb); | ||
2623 | spin_unlock(&tree->lru_lock); | ||
2624 | return eb; | ||
2625 | fail: | ||
2626 | spin_lock(&tree->lru_lock); | ||
2627 | list_del_init(&eb->lru); | ||
2628 | spin_unlock(&tree->lru_lock); | ||
2629 | if (!atomic_dec_and_test(&eb->refs)) | ||
2630 | return NULL; | ||
2631 | for (index = 1; index < i; index++) { | ||
2632 | page_cache_release(extent_buffer_page(eb, index)); | ||
2633 | } | ||
2634 | if (i > 0) | ||
2635 | page_cache_release(extent_buffer_page(eb, 0)); | ||
2636 | __free_extent_buffer(eb); | ||
2637 | return NULL; | ||
2638 | } | ||
2639 | EXPORT_SYMBOL(find_extent_buffer); | ||
2640 | |||
2641 | void free_extent_buffer(struct extent_buffer *eb) | ||
2642 | { | ||
2643 | unsigned long i; | ||
2644 | unsigned long num_pages; | ||
2645 | |||
2646 | if (!eb) | ||
2647 | return; | ||
2648 | |||
2649 | if (!atomic_dec_and_test(&eb->refs)) | ||
2650 | return; | ||
2651 | |||
2652 | WARN_ON(!list_empty(&eb->lru)); | ||
2653 | num_pages = num_extent_pages(eb->start, eb->len); | ||
2654 | |||
2655 | for (i = 1; i < num_pages; i++) { | ||
2656 | page_cache_release(extent_buffer_page(eb, i)); | ||
2657 | } | ||
2658 | page_cache_release(extent_buffer_page(eb, 0)); | ||
2659 | __free_extent_buffer(eb); | ||
2660 | } | ||
2661 | EXPORT_SYMBOL(free_extent_buffer); | ||
2662 | |||
2663 | int clear_extent_buffer_dirty(struct extent_map_tree *tree, | ||
2664 | struct extent_buffer *eb) | ||
2665 | { | ||
2666 | int set; | ||
2667 | unsigned long i; | ||
2668 | unsigned long num_pages; | ||
2669 | struct page *page; | ||
2670 | |||
2671 | u64 start = eb->start; | ||
2672 | u64 end = start + eb->len - 1; | ||
2673 | |||
2674 | set = clear_extent_dirty(tree, start, end, GFP_NOFS); | ||
2675 | num_pages = num_extent_pages(eb->start, eb->len); | ||
2676 | |||
2677 | for (i = 0; i < num_pages; i++) { | ||
2678 | page = extent_buffer_page(eb, i); | ||
2679 | lock_page(page); | ||
2680 | if (i == 0) | ||
2681 | set_page_extent_head(page, eb->len); | ||
2682 | else | ||
2683 | set_page_private(page, EXTENT_PAGE_PRIVATE); | ||
2684 | |||
2685 | /* | ||
2686 | * if we're on the last page or the first page and the | ||
2687 | * block isn't aligned on a page boundary, do extra checks | ||
2688 | * to make sure we don't clean page that is partially dirty | ||
2689 | */ | ||
2690 | if ((i == 0 && (eb->start & (PAGE_CACHE_SIZE - 1))) || | ||
2691 | ((i == num_pages - 1) && | ||
2692 | ((eb->start + eb->len) & (PAGE_CACHE_SIZE - 1)))) { | ||
2693 | start = (u64)page->index << PAGE_CACHE_SHIFT; | ||
2694 | end = start + PAGE_CACHE_SIZE - 1; | ||
2695 | if (test_range_bit(tree, start, end, | ||
2696 | EXTENT_DIRTY, 0)) { | ||
2697 | unlock_page(page); | ||
2698 | continue; | ||
2699 | } | ||
2700 | } | ||
2701 | clear_page_dirty_for_io(page); | ||
2702 | write_lock_irq(&page->mapping->tree_lock); | ||
2703 | if (!PageDirty(page)) { | ||
2704 | radix_tree_tag_clear(&page->mapping->page_tree, | ||
2705 | page_index(page), | ||
2706 | PAGECACHE_TAG_DIRTY); | ||
2707 | } | ||
2708 | write_unlock_irq(&page->mapping->tree_lock); | ||
2709 | unlock_page(page); | ||
2710 | } | ||
2711 | return 0; | ||
2712 | } | ||
2713 | EXPORT_SYMBOL(clear_extent_buffer_dirty); | ||
2714 | |||
2715 | int wait_on_extent_buffer_writeback(struct extent_map_tree *tree, | ||
2716 | struct extent_buffer *eb) | ||
2717 | { | ||
2718 | return wait_on_extent_writeback(tree, eb->start, | ||
2719 | eb->start + eb->len - 1); | ||
2720 | } | ||
2721 | EXPORT_SYMBOL(wait_on_extent_buffer_writeback); | ||
2722 | |||
2723 | int set_extent_buffer_dirty(struct extent_map_tree *tree, | ||
2724 | struct extent_buffer *eb) | ||
2725 | { | ||
2726 | unsigned long i; | ||
2727 | unsigned long num_pages; | ||
2728 | |||
2729 | num_pages = num_extent_pages(eb->start, eb->len); | ||
2730 | for (i = 0; i < num_pages; i++) { | ||
2731 | struct page *page = extent_buffer_page(eb, i); | ||
2732 | /* writepage may need to do something special for the | ||
2733 | * first page, we have to make sure page->private is | ||
2734 | * properly set. releasepage may drop page->private | ||
2735 | * on us if the page isn't already dirty. | ||
2736 | */ | ||
2737 | if (i == 0) { | ||
2738 | lock_page(page); | ||
2739 | set_page_extent_head(page, eb->len); | ||
2740 | } else if (PagePrivate(page) && | ||
2741 | page->private != EXTENT_PAGE_PRIVATE) { | ||
2742 | lock_page(page); | ||
2743 | set_page_extent_mapped(page); | ||
2744 | unlock_page(page); | ||
2745 | } | ||
2746 | __set_page_dirty_nobuffers(extent_buffer_page(eb, i)); | ||
2747 | if (i == 0) | ||
2748 | unlock_page(page); | ||
2749 | } | ||
2750 | return set_extent_dirty(tree, eb->start, | ||
2751 | eb->start + eb->len - 1, GFP_NOFS); | ||
2752 | } | ||
2753 | EXPORT_SYMBOL(set_extent_buffer_dirty); | ||
2754 | |||
2755 | int set_extent_buffer_uptodate(struct extent_map_tree *tree, | ||
2756 | struct extent_buffer *eb) | ||
2757 | { | ||
2758 | unsigned long i; | ||
2759 | struct page *page; | ||
2760 | unsigned long num_pages; | ||
2761 | |||
2762 | num_pages = num_extent_pages(eb->start, eb->len); | ||
2763 | |||
2764 | set_extent_uptodate(tree, eb->start, eb->start + eb->len - 1, | ||
2765 | GFP_NOFS); | ||
2766 | for (i = 0; i < num_pages; i++) { | ||
2767 | page = extent_buffer_page(eb, i); | ||
2768 | if ((i == 0 && (eb->start & (PAGE_CACHE_SIZE - 1))) || | ||
2769 | ((i == num_pages - 1) && | ||
2770 | ((eb->start + eb->len) & (PAGE_CACHE_SIZE - 1)))) { | ||
2771 | check_page_uptodate(tree, page); | ||
2772 | continue; | ||
2773 | } | ||
2774 | SetPageUptodate(page); | ||
2775 | } | ||
2776 | return 0; | ||
2777 | } | ||
2778 | EXPORT_SYMBOL(set_extent_buffer_uptodate); | ||
2779 | |||
2780 | int extent_buffer_uptodate(struct extent_map_tree *tree, | ||
2781 | struct extent_buffer *eb) | ||
2782 | { | ||
2783 | if (eb->flags & EXTENT_UPTODATE) | ||
2784 | return 1; | ||
2785 | return test_range_bit(tree, eb->start, eb->start + eb->len - 1, | ||
2786 | EXTENT_UPTODATE, 1); | ||
2787 | } | ||
2788 | EXPORT_SYMBOL(extent_buffer_uptodate); | ||
2789 | |||
2790 | int read_extent_buffer_pages(struct extent_map_tree *tree, | ||
2791 | struct extent_buffer *eb, | ||
2792 | u64 start, | ||
2793 | int wait) | ||
2794 | { | ||
2795 | unsigned long i; | ||
2796 | unsigned long start_i; | ||
2797 | struct page *page; | ||
2798 | int err; | ||
2799 | int ret = 0; | ||
2800 | unsigned long num_pages; | ||
2801 | |||
2802 | if (eb->flags & EXTENT_UPTODATE) | ||
2803 | return 0; | ||
2804 | |||
2805 | if (0 && test_range_bit(tree, eb->start, eb->start + eb->len - 1, | ||
2806 | EXTENT_UPTODATE, 1)) { | ||
2807 | return 0; | ||
2808 | } | ||
2809 | |||
2810 | if (start) { | ||
2811 | WARN_ON(start < eb->start); | ||
2812 | start_i = (start >> PAGE_CACHE_SHIFT) - | ||
2813 | (eb->start >> PAGE_CACHE_SHIFT); | ||
2814 | } else { | ||
2815 | start_i = 0; | ||
2816 | } | ||
2817 | |||
2818 | num_pages = num_extent_pages(eb->start, eb->len); | ||
2819 | for (i = start_i; i < num_pages; i++) { | ||
2820 | page = extent_buffer_page(eb, i); | ||
2821 | if (PageUptodate(page)) { | ||
2822 | continue; | ||
2823 | } | ||
2824 | if (!wait) { | ||
2825 | if (TestSetPageLocked(page)) { | ||
2826 | continue; | ||
2827 | } | ||
2828 | } else { | ||
2829 | lock_page(page); | ||
2830 | } | ||
2831 | if (!PageUptodate(page)) { | ||
2832 | err = page->mapping->a_ops->readpage(NULL, page); | ||
2833 | if (err) { | ||
2834 | ret = err; | ||
2835 | } | ||
2836 | } else { | ||
2837 | unlock_page(page); | ||
2838 | } | ||
2839 | } | ||
2840 | |||
2841 | if (ret || !wait) { | ||
2842 | return ret; | ||
2843 | } | ||
2844 | |||
2845 | for (i = start_i; i < num_pages; i++) { | ||
2846 | page = extent_buffer_page(eb, i); | ||
2847 | wait_on_page_locked(page); | ||
2848 | if (!PageUptodate(page)) { | ||
2849 | ret = -EIO; | ||
2850 | } | ||
2851 | } | ||
2852 | if (!ret) | ||
2853 | eb->flags |= EXTENT_UPTODATE; | ||
2854 | return ret; | ||
2855 | } | ||
2856 | EXPORT_SYMBOL(read_extent_buffer_pages); | ||
2857 | |||
2858 | void read_extent_buffer(struct extent_buffer *eb, void *dstv, | ||
2859 | unsigned long start, | ||
2860 | unsigned long len) | ||
2861 | { | ||
2862 | size_t cur; | ||
2863 | size_t offset; | ||
2864 | struct page *page; | ||
2865 | char *kaddr; | ||
2866 | char *dst = (char *)dstv; | ||
2867 | size_t start_offset = eb->start & ((u64)PAGE_CACHE_SIZE - 1); | ||
2868 | unsigned long i = (start_offset + start) >> PAGE_CACHE_SHIFT; | ||
2869 | unsigned long num_pages = num_extent_pages(eb->start, eb->len); | ||
2870 | |||
2871 | WARN_ON(start > eb->len); | ||
2872 | WARN_ON(start + len > eb->start + eb->len); | ||
2873 | |||
2874 | offset = (start_offset + start) & ((unsigned long)PAGE_CACHE_SIZE - 1); | ||
2875 | |||
2876 | while(len > 0) { | ||
2877 | page = extent_buffer_page(eb, i); | ||
2878 | if (!PageUptodate(page)) { | ||
2879 | printk("page %lu not up to date i %lu, total %lu, len %lu\n", page->index, i, num_pages, eb->len); | ||
2880 | WARN_ON(1); | ||
2881 | } | ||
2882 | WARN_ON(!PageUptodate(page)); | ||
2883 | |||
2884 | cur = min(len, (PAGE_CACHE_SIZE - offset)); | ||
2885 | kaddr = kmap_atomic(page, KM_USER1); | ||
2886 | memcpy(dst, kaddr + offset, cur); | ||
2887 | kunmap_atomic(kaddr, KM_USER1); | ||
2888 | |||
2889 | dst += cur; | ||
2890 | len -= cur; | ||
2891 | offset = 0; | ||
2892 | i++; | ||
2893 | } | ||
2894 | } | ||
2895 | EXPORT_SYMBOL(read_extent_buffer); | ||
2896 | |||
2897 | int map_private_extent_buffer(struct extent_buffer *eb, unsigned long start, | ||
2898 | unsigned long min_len, char **token, char **map, | ||
2899 | unsigned long *map_start, | ||
2900 | unsigned long *map_len, int km) | ||
2901 | { | ||
2902 | size_t offset = start & (PAGE_CACHE_SIZE - 1); | ||
2903 | char *kaddr; | ||
2904 | struct page *p; | ||
2905 | size_t start_offset = eb->start & ((u64)PAGE_CACHE_SIZE - 1); | ||
2906 | unsigned long i = (start_offset + start) >> PAGE_CACHE_SHIFT; | ||
2907 | unsigned long end_i = (start_offset + start + min_len - 1) >> | ||
2908 | PAGE_CACHE_SHIFT; | ||
2909 | |||
2910 | if (i != end_i) | ||
2911 | return -EINVAL; | ||
2912 | |||
2913 | if (i == 0) { | ||
2914 | offset = start_offset; | ||
2915 | *map_start = 0; | ||
2916 | } else { | ||
2917 | offset = 0; | ||
2918 | *map_start = ((u64)i << PAGE_CACHE_SHIFT) - start_offset; | ||
2919 | } | ||
2920 | if (start + min_len > eb->len) { | ||
2921 | printk("bad mapping eb start %Lu len %lu, wanted %lu %lu\n", eb->start, eb->len, start, min_len); | ||
2922 | WARN_ON(1); | ||
2923 | } | ||
2924 | |||
2925 | p = extent_buffer_page(eb, i); | ||
2926 | WARN_ON(!PageUptodate(p)); | ||
2927 | kaddr = kmap_atomic(p, km); | ||
2928 | *token = kaddr; | ||
2929 | *map = kaddr + offset; | ||
2930 | *map_len = PAGE_CACHE_SIZE - offset; | ||
2931 | return 0; | ||
2932 | } | ||
2933 | EXPORT_SYMBOL(map_private_extent_buffer); | ||
2934 | |||
2935 | int map_extent_buffer(struct extent_buffer *eb, unsigned long start, | ||
2936 | unsigned long min_len, | ||
2937 | char **token, char **map, | ||
2938 | unsigned long *map_start, | ||
2939 | unsigned long *map_len, int km) | ||
2940 | { | ||
2941 | int err; | ||
2942 | int save = 0; | ||
2943 | if (eb->map_token) { | ||
2944 | unmap_extent_buffer(eb, eb->map_token, km); | ||
2945 | eb->map_token = NULL; | ||
2946 | save = 1; | ||
2947 | } | ||
2948 | err = map_private_extent_buffer(eb, start, min_len, token, map, | ||
2949 | map_start, map_len, km); | ||
2950 | if (!err && save) { | ||
2951 | eb->map_token = *token; | ||
2952 | eb->kaddr = *map; | ||
2953 | eb->map_start = *map_start; | ||
2954 | eb->map_len = *map_len; | ||
2955 | } | ||
2956 | return err; | ||
2957 | } | ||
2958 | EXPORT_SYMBOL(map_extent_buffer); | ||
2959 | |||
2960 | void unmap_extent_buffer(struct extent_buffer *eb, char *token, int km) | ||
2961 | { | ||
2962 | kunmap_atomic(token, km); | ||
2963 | } | ||
2964 | EXPORT_SYMBOL(unmap_extent_buffer); | ||
2965 | |||
2966 | int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv, | ||
2967 | unsigned long start, | ||
2968 | unsigned long len) | ||
2969 | { | ||
2970 | size_t cur; | ||
2971 | size_t offset; | ||
2972 | struct page *page; | ||
2973 | char *kaddr; | ||
2974 | char *ptr = (char *)ptrv; | ||
2975 | size_t start_offset = eb->start & ((u64)PAGE_CACHE_SIZE - 1); | ||
2976 | unsigned long i = (start_offset + start) >> PAGE_CACHE_SHIFT; | ||
2977 | int ret = 0; | ||
2978 | |||
2979 | WARN_ON(start > eb->len); | ||
2980 | WARN_ON(start + len > eb->start + eb->len); | ||
2981 | |||
2982 | offset = (start_offset + start) & ((unsigned long)PAGE_CACHE_SIZE - 1); | ||
2983 | |||
2984 | while(len > 0) { | ||
2985 | page = extent_buffer_page(eb, i); | ||
2986 | WARN_ON(!PageUptodate(page)); | ||
2987 | |||
2988 | cur = min(len, (PAGE_CACHE_SIZE - offset)); | ||
2989 | |||
2990 | kaddr = kmap_atomic(page, KM_USER0); | ||
2991 | ret = memcmp(ptr, kaddr + offset, cur); | ||
2992 | kunmap_atomic(kaddr, KM_USER0); | ||
2993 | if (ret) | ||
2994 | break; | ||
2995 | |||
2996 | ptr += cur; | ||
2997 | len -= cur; | ||
2998 | offset = 0; | ||
2999 | i++; | ||
3000 | } | ||
3001 | return ret; | 282 | return ret; |
3002 | } | 283 | } |
3003 | EXPORT_SYMBOL(memcmp_extent_buffer); | 284 | EXPORT_SYMBOL(remove_extent_mapping); |
3004 | |||
3005 | void write_extent_buffer(struct extent_buffer *eb, const void *srcv, | ||
3006 | unsigned long start, unsigned long len) | ||
3007 | { | ||
3008 | size_t cur; | ||
3009 | size_t offset; | ||
3010 | struct page *page; | ||
3011 | char *kaddr; | ||
3012 | char *src = (char *)srcv; | ||
3013 | size_t start_offset = eb->start & ((u64)PAGE_CACHE_SIZE - 1); | ||
3014 | unsigned long i = (start_offset + start) >> PAGE_CACHE_SHIFT; | ||
3015 | |||
3016 | WARN_ON(start > eb->len); | ||
3017 | WARN_ON(start + len > eb->start + eb->len); | ||
3018 | |||
3019 | offset = (start_offset + start) & ((unsigned long)PAGE_CACHE_SIZE - 1); | ||
3020 | |||
3021 | while(len > 0) { | ||
3022 | page = extent_buffer_page(eb, i); | ||
3023 | WARN_ON(!PageUptodate(page)); | ||
3024 | |||
3025 | cur = min(len, PAGE_CACHE_SIZE - offset); | ||
3026 | kaddr = kmap_atomic(page, KM_USER1); | ||
3027 | memcpy(kaddr + offset, src, cur); | ||
3028 | kunmap_atomic(kaddr, KM_USER1); | ||
3029 | |||
3030 | src += cur; | ||
3031 | len -= cur; | ||
3032 | offset = 0; | ||
3033 | i++; | ||
3034 | } | ||
3035 | } | ||
3036 | EXPORT_SYMBOL(write_extent_buffer); | ||
3037 | |||
3038 | void memset_extent_buffer(struct extent_buffer *eb, char c, | ||
3039 | unsigned long start, unsigned long len) | ||
3040 | { | ||
3041 | size_t cur; | ||
3042 | size_t offset; | ||
3043 | struct page *page; | ||
3044 | char *kaddr; | ||
3045 | size_t start_offset = eb->start & ((u64)PAGE_CACHE_SIZE - 1); | ||
3046 | unsigned long i = (start_offset + start) >> PAGE_CACHE_SHIFT; | ||
3047 | |||
3048 | WARN_ON(start > eb->len); | ||
3049 | WARN_ON(start + len > eb->start + eb->len); | ||
3050 | |||
3051 | offset = (start_offset + start) & ((unsigned long)PAGE_CACHE_SIZE - 1); | ||
3052 | |||
3053 | while(len > 0) { | ||
3054 | page = extent_buffer_page(eb, i); | ||
3055 | WARN_ON(!PageUptodate(page)); | ||
3056 | |||
3057 | cur = min(len, PAGE_CACHE_SIZE - offset); | ||
3058 | kaddr = kmap_atomic(page, KM_USER0); | ||
3059 | memset(kaddr + offset, c, cur); | ||
3060 | kunmap_atomic(kaddr, KM_USER0); | ||
3061 | |||
3062 | len -= cur; | ||
3063 | offset = 0; | ||
3064 | i++; | ||
3065 | } | ||
3066 | } | ||
3067 | EXPORT_SYMBOL(memset_extent_buffer); | ||
3068 | |||
3069 | void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src, | ||
3070 | unsigned long dst_offset, unsigned long src_offset, | ||
3071 | unsigned long len) | ||
3072 | { | ||
3073 | u64 dst_len = dst->len; | ||
3074 | size_t cur; | ||
3075 | size_t offset; | ||
3076 | struct page *page; | ||
3077 | char *kaddr; | ||
3078 | size_t start_offset = dst->start & ((u64)PAGE_CACHE_SIZE - 1); | ||
3079 | unsigned long i = (start_offset + dst_offset) >> PAGE_CACHE_SHIFT; | ||
3080 | |||
3081 | WARN_ON(src->len != dst_len); | ||
3082 | |||
3083 | offset = (start_offset + dst_offset) & | ||
3084 | ((unsigned long)PAGE_CACHE_SIZE - 1); | ||
3085 | |||
3086 | while(len > 0) { | ||
3087 | page = extent_buffer_page(dst, i); | ||
3088 | WARN_ON(!PageUptodate(page)); | ||
3089 | |||
3090 | cur = min(len, (unsigned long)(PAGE_CACHE_SIZE - offset)); | ||
3091 | |||
3092 | kaddr = kmap_atomic(page, KM_USER0); | ||
3093 | read_extent_buffer(src, kaddr + offset, src_offset, cur); | ||
3094 | kunmap_atomic(kaddr, KM_USER0); | ||
3095 | |||
3096 | src_offset += cur; | ||
3097 | len -= cur; | ||
3098 | offset = 0; | ||
3099 | i++; | ||
3100 | } | ||
3101 | } | ||
3102 | EXPORT_SYMBOL(copy_extent_buffer); | ||
3103 | |||
3104 | static void move_pages(struct page *dst_page, struct page *src_page, | ||
3105 | unsigned long dst_off, unsigned long src_off, | ||
3106 | unsigned long len) | ||
3107 | { | ||
3108 | char *dst_kaddr = kmap_atomic(dst_page, KM_USER0); | ||
3109 | if (dst_page == src_page) { | ||
3110 | memmove(dst_kaddr + dst_off, dst_kaddr + src_off, len); | ||
3111 | } else { | ||
3112 | char *src_kaddr = kmap_atomic(src_page, KM_USER1); | ||
3113 | char *p = dst_kaddr + dst_off + len; | ||
3114 | char *s = src_kaddr + src_off + len; | ||
3115 | |||
3116 | while (len--) | ||
3117 | *--p = *--s; | ||
3118 | |||
3119 | kunmap_atomic(src_kaddr, KM_USER1); | ||
3120 | } | ||
3121 | kunmap_atomic(dst_kaddr, KM_USER0); | ||
3122 | } | ||
3123 | |||
3124 | static void copy_pages(struct page *dst_page, struct page *src_page, | ||
3125 | unsigned long dst_off, unsigned long src_off, | ||
3126 | unsigned long len) | ||
3127 | { | ||
3128 | char *dst_kaddr = kmap_atomic(dst_page, KM_USER0); | ||
3129 | char *src_kaddr; | ||
3130 | |||
3131 | if (dst_page != src_page) | ||
3132 | src_kaddr = kmap_atomic(src_page, KM_USER1); | ||
3133 | else | ||
3134 | src_kaddr = dst_kaddr; | ||
3135 | |||
3136 | memcpy(dst_kaddr + dst_off, src_kaddr + src_off, len); | ||
3137 | kunmap_atomic(dst_kaddr, KM_USER0); | ||
3138 | if (dst_page != src_page) | ||
3139 | kunmap_atomic(src_kaddr, KM_USER1); | ||
3140 | } | ||
3141 | |||
3142 | void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset, | ||
3143 | unsigned long src_offset, unsigned long len) | ||
3144 | { | ||
3145 | size_t cur; | ||
3146 | size_t dst_off_in_page; | ||
3147 | size_t src_off_in_page; | ||
3148 | size_t start_offset = dst->start & ((u64)PAGE_CACHE_SIZE - 1); | ||
3149 | unsigned long dst_i; | ||
3150 | unsigned long src_i; | ||
3151 | |||
3152 | if (src_offset + len > dst->len) { | ||
3153 | printk("memmove bogus src_offset %lu move len %lu len %lu\n", | ||
3154 | src_offset, len, dst->len); | ||
3155 | BUG_ON(1); | ||
3156 | } | ||
3157 | if (dst_offset + len > dst->len) { | ||
3158 | printk("memmove bogus dst_offset %lu move len %lu len %lu\n", | ||
3159 | dst_offset, len, dst->len); | ||
3160 | BUG_ON(1); | ||
3161 | } | ||
3162 | |||
3163 | while(len > 0) { | ||
3164 | dst_off_in_page = (start_offset + dst_offset) & | ||
3165 | ((unsigned long)PAGE_CACHE_SIZE - 1); | ||
3166 | src_off_in_page = (start_offset + src_offset) & | ||
3167 | ((unsigned long)PAGE_CACHE_SIZE - 1); | ||
3168 | |||
3169 | dst_i = (start_offset + dst_offset) >> PAGE_CACHE_SHIFT; | ||
3170 | src_i = (start_offset + src_offset) >> PAGE_CACHE_SHIFT; | ||
3171 | |||
3172 | cur = min(len, (unsigned long)(PAGE_CACHE_SIZE - | ||
3173 | src_off_in_page)); | ||
3174 | cur = min_t(unsigned long, cur, | ||
3175 | (unsigned long)(PAGE_CACHE_SIZE - dst_off_in_page)); | ||
3176 | |||
3177 | copy_pages(extent_buffer_page(dst, dst_i), | ||
3178 | extent_buffer_page(dst, src_i), | ||
3179 | dst_off_in_page, src_off_in_page, cur); | ||
3180 | |||
3181 | src_offset += cur; | ||
3182 | dst_offset += cur; | ||
3183 | len -= cur; | ||
3184 | } | ||
3185 | } | ||
3186 | EXPORT_SYMBOL(memcpy_extent_buffer); | ||
3187 | |||
3188 | void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset, | ||
3189 | unsigned long src_offset, unsigned long len) | ||
3190 | { | ||
3191 | size_t cur; | ||
3192 | size_t dst_off_in_page; | ||
3193 | size_t src_off_in_page; | ||
3194 | unsigned long dst_end = dst_offset + len - 1; | ||
3195 | unsigned long src_end = src_offset + len - 1; | ||
3196 | size_t start_offset = dst->start & ((u64)PAGE_CACHE_SIZE - 1); | ||
3197 | unsigned long dst_i; | ||
3198 | unsigned long src_i; | ||
3199 | |||
3200 | if (src_offset + len > dst->len) { | ||
3201 | printk("memmove bogus src_offset %lu move len %lu len %lu\n", | ||
3202 | src_offset, len, dst->len); | ||
3203 | BUG_ON(1); | ||
3204 | } | ||
3205 | if (dst_offset + len > dst->len) { | ||
3206 | printk("memmove bogus dst_offset %lu move len %lu len %lu\n", | ||
3207 | dst_offset, len, dst->len); | ||
3208 | BUG_ON(1); | ||
3209 | } | ||
3210 | if (dst_offset < src_offset) { | ||
3211 | memcpy_extent_buffer(dst, dst_offset, src_offset, len); | ||
3212 | return; | ||
3213 | } | ||
3214 | while(len > 0) { | ||
3215 | dst_i = (start_offset + dst_end) >> PAGE_CACHE_SHIFT; | ||
3216 | src_i = (start_offset + src_end) >> PAGE_CACHE_SHIFT; | ||
3217 | |||
3218 | dst_off_in_page = (start_offset + dst_end) & | ||
3219 | ((unsigned long)PAGE_CACHE_SIZE - 1); | ||
3220 | src_off_in_page = (start_offset + src_end) & | ||
3221 | ((unsigned long)PAGE_CACHE_SIZE - 1); | ||
3222 | |||
3223 | cur = min_t(unsigned long, len, src_off_in_page + 1); | ||
3224 | cur = min(cur, dst_off_in_page + 1); | ||
3225 | move_pages(extent_buffer_page(dst, dst_i), | ||
3226 | extent_buffer_page(dst, src_i), | ||
3227 | dst_off_in_page - cur + 1, | ||
3228 | src_off_in_page - cur + 1, cur); | ||
3229 | |||
3230 | dst_end -= cur; | ||
3231 | src_end -= cur; | ||
3232 | len -= cur; | ||
3233 | } | ||
3234 | } | ||
3235 | EXPORT_SYMBOL(memmove_extent_buffer); | ||
diff --git a/fs/btrfs/extent_map.h b/fs/btrfs/extent_map.h index ea60f5447b5b..56314217cfc0 100644 --- a/fs/btrfs/extent_map.h +++ b/fs/btrfs/extent_map.h | |||
@@ -3,215 +3,53 @@ | |||
3 | 3 | ||
4 | #include <linux/rbtree.h> | 4 | #include <linux/rbtree.h> |
5 | 5 | ||
6 | #define EXTENT_MAP_LAST_BYTE (u64)-4 | ||
6 | #define EXTENT_MAP_HOLE (u64)-3 | 7 | #define EXTENT_MAP_HOLE (u64)-3 |
7 | #define EXTENT_MAP_INLINE (u64)-2 | 8 | #define EXTENT_MAP_INLINE (u64)-2 |
8 | #define EXTENT_MAP_DELALLOC (u64)-1 | 9 | #define EXTENT_MAP_DELALLOC (u64)-1 |
9 | 10 | ||
10 | /* bits for the extent state */ | ||
11 | #define EXTENT_DIRTY 1 | ||
12 | #define EXTENT_WRITEBACK (1 << 1) | ||
13 | #define EXTENT_UPTODATE (1 << 2) | ||
14 | #define EXTENT_LOCKED (1 << 3) | ||
15 | #define EXTENT_NEW (1 << 4) | ||
16 | #define EXTENT_DELALLOC (1 << 5) | ||
17 | #define EXTENT_DEFRAG (1 << 6) | ||
18 | #define EXTENT_DEFRAG_DONE (1 << 7) | ||
19 | #define EXTENT_BUFFER_FILLED (1 << 8) | ||
20 | #define EXTENT_CSUM (1 << 9) | ||
21 | #define EXTENT_IOBITS (EXTENT_LOCKED | EXTENT_WRITEBACK) | ||
22 | |||
23 | /* | ||
24 | * page->private values. Every page that is controlled by the extent | ||
25 | * map has page->private set to one. | ||
26 | */ | ||
27 | #define EXTENT_PAGE_PRIVATE 1 | ||
28 | #define EXTENT_PAGE_PRIVATE_FIRST_PAGE 3 | ||
29 | |||
30 | |||
31 | struct extent_map_ops { | ||
32 | int (*fill_delalloc)(struct inode *inode, u64 start, u64 end); | ||
33 | int (*writepage_io_hook)(struct page *page, u64 start, u64 end); | ||
34 | int (*readpage_io_hook)(struct page *page, u64 start, u64 end); | ||
35 | int (*readpage_end_io_hook)(struct page *page, u64 start, u64 end); | ||
36 | void (*writepage_end_io_hook)(struct page *page, u64 start, u64 end); | ||
37 | }; | ||
38 | |||
39 | struct extent_map_tree { | ||
40 | struct rb_root map; | ||
41 | struct rb_root state; | ||
42 | struct address_space *mapping; | ||
43 | u64 dirty_bytes; | ||
44 | rwlock_t lock; | ||
45 | struct extent_map_ops *ops; | ||
46 | spinlock_t lru_lock; | ||
47 | struct list_head buffer_lru; | ||
48 | int lru_size; | ||
49 | }; | ||
50 | |||
51 | /* note, this must start with the same fields as fs/extent_map.c:tree_entry */ | ||
52 | struct extent_map { | 11 | struct extent_map { |
53 | u64 start; | ||
54 | u64 end; /* inclusive */ | ||
55 | int in_tree; | ||
56 | struct rb_node rb_node; | 12 | struct rb_node rb_node; |
57 | /* block_start and block_end are in bytes */ | 13 | |
14 | /* all of these are in bytes */ | ||
15 | u64 start; | ||
16 | u64 len; | ||
58 | u64 block_start; | 17 | u64 block_start; |
59 | u64 block_end; /* inclusive */ | 18 | unsigned long flags; |
60 | struct block_device *bdev; | 19 | struct block_device *bdev; |
61 | atomic_t refs; | 20 | atomic_t refs; |
62 | }; | ||
63 | |||
64 | /* note, this must start with the same fields as fs/extent_map.c:tree_entry */ | ||
65 | struct extent_state { | ||
66 | u64 start; | ||
67 | u64 end; /* inclusive */ | ||
68 | int in_tree; | 21 | int in_tree; |
69 | struct rb_node rb_node; | ||
70 | wait_queue_head_t wq; | ||
71 | atomic_t refs; | ||
72 | unsigned long state; | ||
73 | |||
74 | /* for use by the FS */ | ||
75 | u64 private; | ||
76 | |||
77 | struct list_head list; | ||
78 | }; | 22 | }; |
79 | 23 | ||
80 | struct extent_buffer { | 24 | struct extent_map_tree { |
81 | u64 start; | 25 | struct rb_root map; |
82 | unsigned long len; | 26 | struct extent_map *last; |
83 | char *map_token; | 27 | spinlock_t lock; |
84 | char *kaddr; | ||
85 | unsigned long map_start; | ||
86 | unsigned long map_len; | ||
87 | struct page *first_page; | ||
88 | struct list_head lru; | ||
89 | atomic_t refs; | ||
90 | int flags; | ||
91 | }; | 28 | }; |
92 | 29 | ||
93 | typedef struct extent_map *(get_extent_t)(struct inode *inode, | 30 | static inline u64 extent_map_end(struct extent_map *em) |
94 | struct page *page, | 31 | { |
95 | size_t page_offset, | 32 | if (em->start + em->len < em->start) |
96 | u64 start, u64 end, | 33 | return (u64)-1; |
97 | int create); | 34 | return em->start + em->len; |
35 | } | ||
36 | |||
37 | static inline u64 extent_map_block_end(struct extent_map *em) | ||
38 | { | ||
39 | if (em->block_start + em->len < em->block_start) | ||
40 | return (u64)-1; | ||
41 | return em->block_start + em->len; | ||
42 | } | ||
98 | 43 | ||
99 | void extent_map_tree_init(struct extent_map_tree *tree, | 44 | void extent_map_tree_init(struct extent_map_tree *tree, gfp_t mask); |
100 | struct address_space *mapping, gfp_t mask); | ||
101 | void extent_map_tree_empty_lru(struct extent_map_tree *tree); | ||
102 | struct extent_map *lookup_extent_mapping(struct extent_map_tree *tree, | 45 | struct extent_map *lookup_extent_mapping(struct extent_map_tree *tree, |
103 | u64 start, u64 end); | 46 | u64 start, u64 len); |
104 | int add_extent_mapping(struct extent_map_tree *tree, | 47 | int add_extent_mapping(struct extent_map_tree *tree, |
105 | struct extent_map *em); | 48 | struct extent_map *em); |
106 | int remove_extent_mapping(struct extent_map_tree *tree, struct extent_map *em); | 49 | int remove_extent_mapping(struct extent_map_tree *tree, struct extent_map *em); |
107 | int try_release_extent_mapping(struct extent_map_tree *tree, struct page *page); | 50 | |
108 | int lock_extent(struct extent_map_tree *tree, u64 start, u64 end, gfp_t mask); | ||
109 | int unlock_extent(struct extent_map_tree *tree, u64 start, u64 end, gfp_t mask); | ||
110 | struct extent_map *alloc_extent_map(gfp_t mask); | 51 | struct extent_map *alloc_extent_map(gfp_t mask); |
111 | void free_extent_map(struct extent_map *em); | 52 | void free_extent_map(struct extent_map *em); |
112 | int extent_read_full_page(struct extent_map_tree *tree, struct page *page, | ||
113 | get_extent_t *get_extent); | ||
114 | int __init extent_map_init(void); | 53 | int __init extent_map_init(void); |
115 | void extent_map_exit(void); | 54 | void extent_map_exit(void); |
116 | |||
117 | u64 count_range_bits(struct extent_map_tree *tree, | ||
118 | u64 *start, u64 search_end, | ||
119 | u64 max_bytes, unsigned long bits); | ||
120 | |||
121 | int test_range_bit(struct extent_map_tree *tree, u64 start, u64 end, | ||
122 | int bits, int filled); | ||
123 | int clear_extent_bits(struct extent_map_tree *tree, u64 start, u64 end, | ||
124 | int bits, gfp_t mask); | ||
125 | int set_extent_bits(struct extent_map_tree *tree, u64 start, u64 end, | ||
126 | int bits, gfp_t mask); | ||
127 | int set_extent_uptodate(struct extent_map_tree *tree, u64 start, u64 end, | ||
128 | gfp_t mask); | ||
129 | int set_extent_new(struct extent_map_tree *tree, u64 start, u64 end, | ||
130 | gfp_t mask); | ||
131 | int set_extent_dirty(struct extent_map_tree *tree, u64 start, u64 end, | ||
132 | gfp_t mask); | ||
133 | int clear_extent_dirty(struct extent_map_tree *tree, u64 start, u64 end, | ||
134 | gfp_t mask); | ||
135 | int set_extent_delalloc(struct extent_map_tree *tree, u64 start, u64 end, | ||
136 | gfp_t mask); | ||
137 | int find_first_extent_bit(struct extent_map_tree *tree, u64 start, | ||
138 | u64 *start_ret, u64 *end_ret, int bits); | ||
139 | int extent_invalidatepage(struct extent_map_tree *tree, | ||
140 | struct page *page, unsigned long offset); | ||
141 | int extent_write_full_page(struct extent_map_tree *tree, struct page *page, | ||
142 | get_extent_t *get_extent, | ||
143 | struct writeback_control *wbc); | ||
144 | int extent_writepages(struct extent_map_tree *tree, | ||
145 | struct address_space *mapping, | ||
146 | get_extent_t *get_extent, | ||
147 | struct writeback_control *wbc); | ||
148 | int extent_readpages(struct extent_map_tree *tree, | ||
149 | struct address_space *mapping, | ||
150 | struct list_head *pages, unsigned nr_pages, | ||
151 | get_extent_t get_extent); | ||
152 | int extent_prepare_write(struct extent_map_tree *tree, | ||
153 | struct inode *inode, struct page *page, | ||
154 | unsigned from, unsigned to, get_extent_t *get_extent); | ||
155 | int extent_commit_write(struct extent_map_tree *tree, | ||
156 | struct inode *inode, struct page *page, | ||
157 | unsigned from, unsigned to); | ||
158 | sector_t extent_bmap(struct address_space *mapping, sector_t iblock, | ||
159 | get_extent_t *get_extent); | ||
160 | int set_range_dirty(struct extent_map_tree *tree, u64 start, u64 end); | ||
161 | int set_state_private(struct extent_map_tree *tree, u64 start, u64 private); | ||
162 | int get_state_private(struct extent_map_tree *tree, u64 start, u64 *private); | ||
163 | void set_page_extent_mapped(struct page *page); | ||
164 | |||
165 | struct extent_buffer *alloc_extent_buffer(struct extent_map_tree *tree, | ||
166 | u64 start, unsigned long len, | ||
167 | struct page *page0, | ||
168 | gfp_t mask); | ||
169 | struct extent_buffer *find_extent_buffer(struct extent_map_tree *tree, | ||
170 | u64 start, unsigned long len, | ||
171 | gfp_t mask); | ||
172 | void free_extent_buffer(struct extent_buffer *eb); | ||
173 | int read_extent_buffer_pages(struct extent_map_tree *tree, | ||
174 | struct extent_buffer *eb, u64 start, int wait); | ||
175 | |||
176 | static inline void extent_buffer_get(struct extent_buffer *eb) | ||
177 | { | ||
178 | atomic_inc(&eb->refs); | ||
179 | } | ||
180 | |||
181 | int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv, | ||
182 | unsigned long start, | ||
183 | unsigned long len); | ||
184 | void read_extent_buffer(struct extent_buffer *eb, void *dst, | ||
185 | unsigned long start, | ||
186 | unsigned long len); | ||
187 | void write_extent_buffer(struct extent_buffer *eb, const void *src, | ||
188 | unsigned long start, unsigned long len); | ||
189 | void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src, | ||
190 | unsigned long dst_offset, unsigned long src_offset, | ||
191 | unsigned long len); | ||
192 | void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset, | ||
193 | unsigned long src_offset, unsigned long len); | ||
194 | void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset, | ||
195 | unsigned long src_offset, unsigned long len); | ||
196 | void memset_extent_buffer(struct extent_buffer *eb, char c, | ||
197 | unsigned long start, unsigned long len); | ||
198 | int wait_on_extent_buffer_writeback(struct extent_map_tree *tree, | ||
199 | struct extent_buffer *eb); | ||
200 | int clear_extent_buffer_dirty(struct extent_map_tree *tree, | ||
201 | struct extent_buffer *eb); | ||
202 | int set_extent_buffer_dirty(struct extent_map_tree *tree, | ||
203 | struct extent_buffer *eb); | ||
204 | int set_extent_buffer_uptodate(struct extent_map_tree *tree, | ||
205 | struct extent_buffer *eb); | ||
206 | int extent_buffer_uptodate(struct extent_map_tree *tree, | ||
207 | struct extent_buffer *eb); | ||
208 | int map_extent_buffer(struct extent_buffer *eb, unsigned long offset, | ||
209 | unsigned long min_len, char **token, char **map, | ||
210 | unsigned long *map_start, | ||
211 | unsigned long *map_len, int km); | ||
212 | int map_private_extent_buffer(struct extent_buffer *eb, unsigned long offset, | ||
213 | unsigned long min_len, char **token, char **map, | ||
214 | unsigned long *map_start, | ||
215 | unsigned long *map_len, int km); | ||
216 | void unmap_extent_buffer(struct extent_buffer *eb, char *token, int km); | ||
217 | #endif | 55 | #endif |
diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c index 1cd8c908811e..c5bb00f92396 100644 --- a/fs/btrfs/file.c +++ b/fs/btrfs/file.c | |||
@@ -233,8 +233,7 @@ static int noinline dirty_and_release_pages(struct btrfs_trans_handle *trans, | |||
233 | int err = 0; | 233 | int err = 0; |
234 | int i; | 234 | int i; |
235 | struct inode *inode = fdentry(file)->d_inode; | 235 | struct inode *inode = fdentry(file)->d_inode; |
236 | struct extent_map *em; | 236 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
237 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; | ||
238 | u64 hint_byte; | 237 | u64 hint_byte; |
239 | u64 num_bytes; | 238 | u64 num_bytes; |
240 | u64 start_pos; | 239 | u64 start_pos; |
@@ -242,11 +241,6 @@ static int noinline dirty_and_release_pages(struct btrfs_trans_handle *trans, | |||
242 | u64 end_pos = pos + write_bytes; | 241 | u64 end_pos = pos + write_bytes; |
243 | u64 inline_size; | 242 | u64 inline_size; |
244 | loff_t isize = i_size_read(inode); | 243 | loff_t isize = i_size_read(inode); |
245 | em = alloc_extent_map(GFP_NOFS); | ||
246 | if (!em) | ||
247 | return -ENOMEM; | ||
248 | |||
249 | em->bdev = inode->i_sb->s_bdev; | ||
250 | 244 | ||
251 | start_pos = pos & ~((u64)root->sectorsize - 1); | 245 | start_pos = pos & ~((u64)root->sectorsize - 1); |
252 | num_bytes = (write_bytes + pos - start_pos + | 246 | num_bytes = (write_bytes + pos - start_pos + |
@@ -254,7 +248,7 @@ static int noinline dirty_and_release_pages(struct btrfs_trans_handle *trans, | |||
254 | 248 | ||
255 | end_of_last_block = start_pos + num_bytes - 1; | 249 | end_of_last_block = start_pos + num_bytes - 1; |
256 | 250 | ||
257 | lock_extent(em_tree, start_pos, end_of_last_block, GFP_NOFS); | 251 | lock_extent(io_tree, start_pos, end_of_last_block, GFP_NOFS); |
258 | mutex_lock(&root->fs_info->fs_mutex); | 252 | mutex_lock(&root->fs_info->fs_mutex); |
259 | trans = btrfs_start_transaction(root, 1); | 253 | trans = btrfs_start_transaction(root, 1); |
260 | if (!trans) { | 254 | if (!trans) { |
@@ -268,7 +262,7 @@ static int noinline dirty_and_release_pages(struct btrfs_trans_handle *trans, | |||
268 | if ((end_of_last_block & 4095) == 0) { | 262 | if ((end_of_last_block & 4095) == 0) { |
269 | printk("strange end of last %Lu %zu %Lu\n", start_pos, write_bytes, end_of_last_block); | 263 | printk("strange end of last %Lu %zu %Lu\n", start_pos, write_bytes, end_of_last_block); |
270 | } | 264 | } |
271 | set_extent_uptodate(em_tree, start_pos, end_of_last_block, GFP_NOFS); | 265 | set_extent_uptodate(io_tree, start_pos, end_of_last_block, GFP_NOFS); |
272 | 266 | ||
273 | /* FIXME...EIEIO, ENOSPC and more */ | 267 | /* FIXME...EIEIO, ENOSPC and more */ |
274 | 268 | ||
@@ -293,6 +287,8 @@ static int noinline dirty_and_release_pages(struct btrfs_trans_handle *trans, | |||
293 | inode->i_ino, | 287 | inode->i_ino, |
294 | last_pos_in_file, | 288 | last_pos_in_file, |
295 | 0, 0, hole_size); | 289 | 0, 0, hole_size); |
290 | btrfs_drop_extent_cache(inode, last_pos_in_file, | ||
291 | last_pos_in_file + hole_size -1); | ||
296 | btrfs_check_file(root, inode); | 292 | btrfs_check_file(root, inode); |
297 | } | 293 | } |
298 | if (err) | 294 | if (err) |
@@ -320,12 +316,12 @@ static int noinline dirty_and_release_pages(struct btrfs_trans_handle *trans, | |||
320 | last_end += PAGE_CACHE_SIZE - 1; | 316 | last_end += PAGE_CACHE_SIZE - 1; |
321 | if (start_pos < isize) { | 317 | if (start_pos < isize) { |
322 | u64 delalloc_start = start_pos; | 318 | u64 delalloc_start = start_pos; |
323 | existing_delalloc = count_range_bits(em_tree, | 319 | existing_delalloc = count_range_bits(io_tree, |
324 | &delalloc_start, | 320 | &delalloc_start, |
325 | end_of_last_block, (u64)-1, | 321 | end_of_last_block, (u64)-1, |
326 | EXTENT_DELALLOC); | 322 | EXTENT_DELALLOC); |
327 | } | 323 | } |
328 | set_extent_delalloc(em_tree, start_pos, end_of_last_block, | 324 | set_extent_delalloc(io_tree, start_pos, end_of_last_block, |
329 | GFP_NOFS); | 325 | GFP_NOFS); |
330 | spin_lock(&root->fs_info->delalloc_lock); | 326 | spin_lock(&root->fs_info->delalloc_lock); |
331 | root->fs_info->delalloc_bytes += (end_of_last_block + 1 - | 327 | root->fs_info->delalloc_bytes += (end_of_last_block + 1 - |
@@ -346,6 +342,7 @@ static int noinline dirty_and_release_pages(struct btrfs_trans_handle *trans, | |||
346 | inline_size -= start_pos; | 342 | inline_size -= start_pos; |
347 | err = insert_inline_extent(trans, root, inode, start_pos, | 343 | err = insert_inline_extent(trans, root, inode, start_pos, |
348 | inline_size, pages, 0, num_pages); | 344 | inline_size, pages, 0, num_pages); |
345 | btrfs_drop_extent_cache(inode, start_pos, aligned_end - 1); | ||
349 | BUG_ON(err); | 346 | BUG_ON(err); |
350 | } | 347 | } |
351 | if (end_pos > isize) { | 348 | if (end_pos > isize) { |
@@ -356,8 +353,7 @@ failed: | |||
356 | err = btrfs_end_transaction(trans, root); | 353 | err = btrfs_end_transaction(trans, root); |
357 | out_unlock: | 354 | out_unlock: |
358 | mutex_unlock(&root->fs_info->fs_mutex); | 355 | mutex_unlock(&root->fs_info->fs_mutex); |
359 | unlock_extent(em_tree, start_pos, end_of_last_block, GFP_NOFS); | 356 | unlock_extent(io_tree, start_pos, end_of_last_block, GFP_NOFS); |
360 | free_extent_map(em); | ||
361 | return err; | 357 | return err; |
362 | } | 358 | } |
363 | 359 | ||
@@ -367,10 +363,15 @@ int btrfs_drop_extent_cache(struct inode *inode, u64 start, u64 end) | |||
367 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; | 363 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; |
368 | 364 | ||
369 | while(1) { | 365 | while(1) { |
366 | spin_lock(&em_tree->lock); | ||
370 | em = lookup_extent_mapping(em_tree, start, end); | 367 | em = lookup_extent_mapping(em_tree, start, end); |
371 | if (!em) | 368 | if (!em) { |
369 | spin_unlock(&em_tree->lock); | ||
372 | break; | 370 | break; |
371 | } | ||
373 | remove_extent_mapping(em_tree, em); | 372 | remove_extent_mapping(em_tree, em); |
373 | spin_unlock(&em_tree->lock); | ||
374 | |||
374 | /* once for us */ | 375 | /* once for us */ |
375 | free_extent_map(em); | 376 | free_extent_map(em); |
376 | /* once for the tree*/ | 377 | /* once for the tree*/ |
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c index 67005480e139..16d3aef45d18 100644 --- a/fs/btrfs/inode.c +++ b/fs/btrfs/inode.c | |||
@@ -53,7 +53,7 @@ static struct inode_operations btrfs_file_inode_operations; | |||
53 | static struct address_space_operations btrfs_aops; | 53 | static struct address_space_operations btrfs_aops; |
54 | static struct address_space_operations btrfs_symlink_aops; | 54 | static struct address_space_operations btrfs_symlink_aops; |
55 | static struct file_operations btrfs_dir_file_operations; | 55 | static struct file_operations btrfs_dir_file_operations; |
56 | static struct extent_map_ops btrfs_extent_map_ops; | 56 | static struct extent_io_ops btrfs_extent_io_ops; |
57 | 57 | ||
58 | static struct kmem_cache *btrfs_inode_cachep; | 58 | static struct kmem_cache *btrfs_inode_cachep; |
59 | struct kmem_cache *btrfs_trans_handle_cachep; | 59 | struct kmem_cache *btrfs_trans_handle_cachep; |
@@ -104,6 +104,8 @@ static int cow_file_range(struct inode *inode, u64 start, u64 end) | |||
104 | u64 num_bytes; | 104 | u64 num_bytes; |
105 | u64 cur_alloc_size; | 105 | u64 cur_alloc_size; |
106 | u64 blocksize = root->sectorsize; | 106 | u64 blocksize = root->sectorsize; |
107 | u64 orig_start = start; | ||
108 | u64 orig_num_bytes; | ||
107 | struct btrfs_key ins; | 109 | struct btrfs_key ins; |
108 | int ret; | 110 | int ret; |
109 | 111 | ||
@@ -115,6 +117,7 @@ static int cow_file_range(struct inode *inode, u64 start, u64 end) | |||
115 | num_bytes = max(blocksize, num_bytes); | 117 | num_bytes = max(blocksize, num_bytes); |
116 | ret = btrfs_drop_extents(trans, root, inode, | 118 | ret = btrfs_drop_extents(trans, root, inode, |
117 | start, start + num_bytes, start, &alloc_hint); | 119 | start, start + num_bytes, start, &alloc_hint); |
120 | orig_num_bytes = num_bytes; | ||
118 | 121 | ||
119 | if (alloc_hint == EXTENT_MAP_INLINE) | 122 | if (alloc_hint == EXTENT_MAP_INLINE) |
120 | goto out; | 123 | goto out; |
@@ -138,6 +141,8 @@ static int cow_file_range(struct inode *inode, u64 start, u64 end) | |||
138 | alloc_hint = ins.objectid + ins.offset; | 141 | alloc_hint = ins.objectid + ins.offset; |
139 | start += cur_alloc_size; | 142 | start += cur_alloc_size; |
140 | } | 143 | } |
144 | btrfs_drop_extent_cache(inode, orig_start, | ||
145 | orig_start + orig_num_bytes - 1); | ||
141 | btrfs_add_ordered_inode(inode); | 146 | btrfs_add_ordered_inode(inode); |
142 | out: | 147 | out: |
143 | btrfs_end_transaction(trans, root); | 148 | btrfs_end_transaction(trans, root); |
@@ -297,7 +302,7 @@ int btrfs_readpage_io_hook(struct page *page, u64 start, u64 end) | |||
297 | int ret = 0; | 302 | int ret = 0; |
298 | struct inode *inode = page->mapping->host; | 303 | struct inode *inode = page->mapping->host; |
299 | struct btrfs_root *root = BTRFS_I(inode)->root; | 304 | struct btrfs_root *root = BTRFS_I(inode)->root; |
300 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; | 305 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
301 | struct btrfs_csum_item *item; | 306 | struct btrfs_csum_item *item; |
302 | struct btrfs_path *path = NULL; | 307 | struct btrfs_path *path = NULL; |
303 | u32 csum; | 308 | u32 csum; |
@@ -317,7 +322,7 @@ int btrfs_readpage_io_hook(struct page *page, u64 start, u64 end) | |||
317 | } | 322 | } |
318 | read_extent_buffer(path->nodes[0], &csum, (unsigned long)item, | 323 | read_extent_buffer(path->nodes[0], &csum, (unsigned long)item, |
319 | BTRFS_CRC32_SIZE); | 324 | BTRFS_CRC32_SIZE); |
320 | set_state_private(em_tree, start, csum); | 325 | set_state_private(io_tree, start, csum); |
321 | out: | 326 | out: |
322 | if (path) | 327 | if (path) |
323 | btrfs_free_path(path); | 328 | btrfs_free_path(path); |
@@ -329,17 +334,19 @@ int btrfs_readpage_end_io_hook(struct page *page, u64 start, u64 end) | |||
329 | { | 334 | { |
330 | size_t offset = start - ((u64)page->index << PAGE_CACHE_SHIFT); | 335 | size_t offset = start - ((u64)page->index << PAGE_CACHE_SHIFT); |
331 | struct inode *inode = page->mapping->host; | 336 | struct inode *inode = page->mapping->host; |
332 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; | 337 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
333 | char *kaddr; | 338 | char *kaddr; |
334 | u64 private; | 339 | u64 private; |
335 | int ret; | 340 | int ret; |
336 | struct btrfs_root *root = BTRFS_I(inode)->root; | 341 | struct btrfs_root *root = BTRFS_I(inode)->root; |
337 | u32 csum = ~(u32)0; | 342 | u32 csum = ~(u32)0; |
338 | unsigned long flags; | 343 | unsigned long flags; |
344 | |||
339 | if (btrfs_test_opt(root, NODATASUM) || | 345 | if (btrfs_test_opt(root, NODATASUM) || |
340 | btrfs_test_flag(inode, NODATASUM)) | 346 | btrfs_test_flag(inode, NODATASUM)) |
341 | return 0; | 347 | return 0; |
342 | ret = get_state_private(em_tree, start, &private); | 348 | |
349 | ret = get_state_private(io_tree, start, &private); | ||
343 | local_irq_save(flags); | 350 | local_irq_save(flags); |
344 | kaddr = kmap_atomic(page, KM_IRQ0); | 351 | kaddr = kmap_atomic(page, KM_IRQ0); |
345 | if (ret) { | 352 | if (ret) { |
@@ -428,7 +435,7 @@ void btrfs_read_locked_inode(struct inode *inode) | |||
428 | switch (inode->i_mode & S_IFMT) { | 435 | switch (inode->i_mode & S_IFMT) { |
429 | case S_IFREG: | 436 | case S_IFREG: |
430 | inode->i_mapping->a_ops = &btrfs_aops; | 437 | inode->i_mapping->a_ops = &btrfs_aops; |
431 | BTRFS_I(inode)->extent_tree.ops = &btrfs_extent_map_ops; | 438 | BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops; |
432 | inode->i_fop = &btrfs_file_operations; | 439 | inode->i_fop = &btrfs_file_operations; |
433 | inode->i_op = &btrfs_file_inode_operations; | 440 | inode->i_op = &btrfs_file_inode_operations; |
434 | break; | 441 | break; |
@@ -873,7 +880,7 @@ static int btrfs_cow_one_page(struct inode *inode, struct page *page, | |||
873 | size_t zero_start) | 880 | size_t zero_start) |
874 | { | 881 | { |
875 | char *kaddr; | 882 | char *kaddr; |
876 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; | 883 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
877 | struct btrfs_root *root = BTRFS_I(inode)->root; | 884 | struct btrfs_root *root = BTRFS_I(inode)->root; |
878 | u64 page_start = (u64)page->index << PAGE_CACHE_SHIFT; | 885 | u64 page_start = (u64)page->index << PAGE_CACHE_SHIFT; |
879 | u64 page_end = page_start + PAGE_CACHE_SIZE - 1; | 886 | u64 page_end = page_start + PAGE_CACHE_SIZE - 1; |
@@ -884,12 +891,12 @@ static int btrfs_cow_one_page(struct inode *inode, struct page *page, | |||
884 | WARN_ON(!PageLocked(page)); | 891 | WARN_ON(!PageLocked(page)); |
885 | set_page_extent_mapped(page); | 892 | set_page_extent_mapped(page); |
886 | 893 | ||
887 | lock_extent(em_tree, page_start, page_end, GFP_NOFS); | 894 | lock_extent(io_tree, page_start, page_end, GFP_NOFS); |
888 | delalloc_start = page_start; | 895 | delalloc_start = page_start; |
889 | existing_delalloc = count_range_bits(&BTRFS_I(inode)->extent_tree, | 896 | existing_delalloc = count_range_bits(&BTRFS_I(inode)->io_tree, |
890 | &delalloc_start, page_end, | 897 | &delalloc_start, page_end, |
891 | PAGE_CACHE_SIZE, EXTENT_DELALLOC); | 898 | PAGE_CACHE_SIZE, EXTENT_DELALLOC); |
892 | set_extent_delalloc(&BTRFS_I(inode)->extent_tree, page_start, | 899 | set_extent_delalloc(&BTRFS_I(inode)->io_tree, page_start, |
893 | page_end, GFP_NOFS); | 900 | page_end, GFP_NOFS); |
894 | 901 | ||
895 | spin_lock(&root->fs_info->delalloc_lock); | 902 | spin_lock(&root->fs_info->delalloc_lock); |
@@ -903,7 +910,7 @@ static int btrfs_cow_one_page(struct inode *inode, struct page *page, | |||
903 | kunmap(page); | 910 | kunmap(page); |
904 | } | 911 | } |
905 | set_page_dirty(page); | 912 | set_page_dirty(page); |
906 | unlock_extent(em_tree, page_start, page_end, GFP_NOFS); | 913 | unlock_extent(io_tree, page_start, page_end, GFP_NOFS); |
907 | 914 | ||
908 | return ret; | 915 | return ret; |
909 | } | 916 | } |
@@ -961,7 +968,7 @@ static int btrfs_setattr(struct dentry *dentry, struct iattr *attr) | |||
961 | attr->ia_valid & ATTR_SIZE && attr->ia_size > inode->i_size) { | 968 | attr->ia_valid & ATTR_SIZE && attr->ia_size > inode->i_size) { |
962 | struct btrfs_trans_handle *trans; | 969 | struct btrfs_trans_handle *trans; |
963 | struct btrfs_root *root = BTRFS_I(inode)->root; | 970 | struct btrfs_root *root = BTRFS_I(inode)->root; |
964 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; | 971 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
965 | 972 | ||
966 | u64 mask = root->sectorsize - 1; | 973 | u64 mask = root->sectorsize - 1; |
967 | u64 pos = (inode->i_size + mask) & ~mask; | 974 | u64 pos = (inode->i_size + mask) & ~mask; |
@@ -986,7 +993,7 @@ static int btrfs_setattr(struct dentry *dentry, struct iattr *attr) | |||
986 | 993 | ||
987 | btrfs_truncate_page(inode->i_mapping, inode->i_size); | 994 | btrfs_truncate_page(inode->i_mapping, inode->i_size); |
988 | 995 | ||
989 | lock_extent(em_tree, pos, block_end, GFP_NOFS); | 996 | lock_extent(io_tree, pos, block_end, GFP_NOFS); |
990 | hole_size = block_end - hole_start; | 997 | hole_size = block_end - hole_start; |
991 | 998 | ||
992 | mutex_lock(&root->fs_info->fs_mutex); | 999 | mutex_lock(&root->fs_info->fs_mutex); |
@@ -1001,11 +1008,13 @@ static int btrfs_setattr(struct dentry *dentry, struct iattr *attr) | |||
1001 | inode->i_ino, | 1008 | inode->i_ino, |
1002 | hole_start, 0, 0, | 1009 | hole_start, 0, 0, |
1003 | hole_size); | 1010 | hole_size); |
1011 | btrfs_drop_extent_cache(inode, hole_start, | ||
1012 | hole_size - 1); | ||
1004 | btrfs_check_file(root, inode); | 1013 | btrfs_check_file(root, inode); |
1005 | } | 1014 | } |
1006 | btrfs_end_transaction(trans, root); | 1015 | btrfs_end_transaction(trans, root); |
1007 | mutex_unlock(&root->fs_info->fs_mutex); | 1016 | mutex_unlock(&root->fs_info->fs_mutex); |
1008 | unlock_extent(em_tree, pos, block_end, GFP_NOFS); | 1017 | unlock_extent(io_tree, pos, block_end, GFP_NOFS); |
1009 | if (err) | 1018 | if (err) |
1010 | return err; | 1019 | return err; |
1011 | } | 1020 | } |
@@ -1189,7 +1198,8 @@ static int btrfs_init_locked_inode(struct inode *inode, void *p) | |||
1189 | struct btrfs_iget_args *args = p; | 1198 | struct btrfs_iget_args *args = p; |
1190 | inode->i_ino = args->ino; | 1199 | inode->i_ino = args->ino; |
1191 | BTRFS_I(inode)->root = args->root; | 1200 | BTRFS_I(inode)->root = args->root; |
1192 | extent_map_tree_init(&BTRFS_I(inode)->extent_tree, | 1201 | extent_map_tree_init(&BTRFS_I(inode)->extent_tree, GFP_NOFS); |
1202 | extent_io_tree_init(&BTRFS_I(inode)->io_tree, | ||
1193 | inode->i_mapping, GFP_NOFS); | 1203 | inode->i_mapping, GFP_NOFS); |
1194 | return 0; | 1204 | return 0; |
1195 | } | 1205 | } |
@@ -1485,7 +1495,8 @@ static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans, | |||
1485 | if (!inode) | 1495 | if (!inode) |
1486 | return ERR_PTR(-ENOMEM); | 1496 | return ERR_PTR(-ENOMEM); |
1487 | 1497 | ||
1488 | extent_map_tree_init(&BTRFS_I(inode)->extent_tree, | 1498 | extent_map_tree_init(&BTRFS_I(inode)->extent_tree, GFP_NOFS); |
1499 | extent_io_tree_init(&BTRFS_I(inode)->io_tree, | ||
1489 | inode->i_mapping, GFP_NOFS); | 1500 | inode->i_mapping, GFP_NOFS); |
1490 | BTRFS_I(inode)->root = root; | 1501 | BTRFS_I(inode)->root = root; |
1491 | 1502 | ||
@@ -1672,9 +1683,10 @@ static int btrfs_create(struct inode *dir, struct dentry *dentry, | |||
1672 | inode->i_mapping->a_ops = &btrfs_aops; | 1683 | inode->i_mapping->a_ops = &btrfs_aops; |
1673 | inode->i_fop = &btrfs_file_operations; | 1684 | inode->i_fop = &btrfs_file_operations; |
1674 | inode->i_op = &btrfs_file_inode_operations; | 1685 | inode->i_op = &btrfs_file_inode_operations; |
1675 | extent_map_tree_init(&BTRFS_I(inode)->extent_tree, | 1686 | extent_map_tree_init(&BTRFS_I(inode)->extent_tree, GFP_NOFS); |
1687 | extent_io_tree_init(&BTRFS_I(inode)->io_tree, | ||
1676 | inode->i_mapping, GFP_NOFS); | 1688 | inode->i_mapping, GFP_NOFS); |
1677 | BTRFS_I(inode)->extent_tree.ops = &btrfs_extent_map_ops; | 1689 | BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops; |
1678 | } | 1690 | } |
1679 | dir->i_sb->s_dirt = 1; | 1691 | dir->i_sb->s_dirt = 1; |
1680 | btrfs_update_inode_block_group(trans, inode); | 1692 | btrfs_update_inode_block_group(trans, inode); |
@@ -1816,7 +1828,7 @@ out_unlock: | |||
1816 | } | 1828 | } |
1817 | 1829 | ||
1818 | struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page, | 1830 | struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page, |
1819 | size_t page_offset, u64 start, u64 end, | 1831 | size_t page_offset, u64 start, u64 len, |
1820 | int create) | 1832 | int create) |
1821 | { | 1833 | { |
1822 | int ret; | 1834 | int ret; |
@@ -1826,7 +1838,6 @@ struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page, | |||
1826 | u64 extent_end = 0; | 1838 | u64 extent_end = 0; |
1827 | u64 objectid = inode->i_ino; | 1839 | u64 objectid = inode->i_ino; |
1828 | u32 found_type; | 1840 | u32 found_type; |
1829 | int failed_insert = 0; | ||
1830 | struct btrfs_path *path; | 1841 | struct btrfs_path *path; |
1831 | struct btrfs_root *root = BTRFS_I(inode)->root; | 1842 | struct btrfs_root *root = BTRFS_I(inode)->root; |
1832 | struct btrfs_file_extent_item *item; | 1843 | struct btrfs_file_extent_item *item; |
@@ -1834,6 +1845,7 @@ struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page, | |||
1834 | struct btrfs_key found_key; | 1845 | struct btrfs_key found_key; |
1835 | struct extent_map *em = NULL; | 1846 | struct extent_map *em = NULL; |
1836 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; | 1847 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; |
1848 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; | ||
1837 | struct btrfs_trans_handle *trans = NULL; | 1849 | struct btrfs_trans_handle *trans = NULL; |
1838 | 1850 | ||
1839 | path = btrfs_alloc_path(); | 1851 | path = btrfs_alloc_path(); |
@@ -1841,24 +1853,26 @@ struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page, | |||
1841 | mutex_lock(&root->fs_info->fs_mutex); | 1853 | mutex_lock(&root->fs_info->fs_mutex); |
1842 | 1854 | ||
1843 | again: | 1855 | again: |
1844 | em = lookup_extent_mapping(em_tree, start, end); | 1856 | spin_lock(&em_tree->lock); |
1857 | em = lookup_extent_mapping(em_tree, start, len); | ||
1858 | spin_unlock(&em_tree->lock); | ||
1859 | |||
1845 | if (em) { | 1860 | if (em) { |
1846 | if (em->start > start) { | 1861 | if (em->start > start) { |
1847 | printk("get_extent start %Lu em start %Lu\n", | 1862 | printk("get_extent lookup [%Lu %Lu] em [%Lu %Lu]\n", |
1848 | start, em->start); | 1863 | start, len, em->start, em->len); |
1849 | WARN_ON(1); | 1864 | WARN_ON(1); |
1850 | } | 1865 | } |
1851 | goto out; | 1866 | goto out; |
1852 | } | 1867 | } |
1868 | em = alloc_extent_map(GFP_NOFS); | ||
1853 | if (!em) { | 1869 | if (!em) { |
1854 | em = alloc_extent_map(GFP_NOFS); | 1870 | err = -ENOMEM; |
1855 | if (!em) { | 1871 | goto out; |
1856 | err = -ENOMEM; | ||
1857 | goto out; | ||
1858 | } | ||
1859 | em->start = EXTENT_MAP_HOLE; | ||
1860 | em->end = EXTENT_MAP_HOLE; | ||
1861 | } | 1872 | } |
1873 | |||
1874 | em->start = EXTENT_MAP_HOLE; | ||
1875 | em->len = (u64)-1; | ||
1862 | em->bdev = inode->i_sb->s_bdev; | 1876 | em->bdev = inode->i_sb->s_bdev; |
1863 | ret = btrfs_lookup_file_extent(trans, root, path, | 1877 | ret = btrfs_lookup_file_extent(trans, root, path, |
1864 | objectid, start, trans != NULL); | 1878 | objectid, start, trans != NULL); |
@@ -1893,28 +1907,25 @@ again: | |||
1893 | if (start < extent_start || start >= extent_end) { | 1907 | if (start < extent_start || start >= extent_end) { |
1894 | em->start = start; | 1908 | em->start = start; |
1895 | if (start < extent_start) { | 1909 | if (start < extent_start) { |
1896 | if (end < extent_start) | 1910 | if (start + len <= extent_start) |
1897 | goto not_found; | 1911 | goto not_found; |
1898 | em->end = extent_end - 1; | 1912 | em->len = extent_end - extent_start; |
1899 | } else { | 1913 | } else { |
1900 | em->end = end; | 1914 | em->len = len; |
1901 | } | 1915 | } |
1902 | goto not_found_em; | 1916 | goto not_found_em; |
1903 | } | 1917 | } |
1904 | bytenr = btrfs_file_extent_disk_bytenr(leaf, item); | 1918 | bytenr = btrfs_file_extent_disk_bytenr(leaf, item); |
1905 | if (bytenr == 0) { | 1919 | if (bytenr == 0) { |
1906 | em->start = extent_start; | 1920 | em->start = extent_start; |
1907 | em->end = extent_end - 1; | 1921 | em->len = extent_end - extent_start; |
1908 | em->block_start = EXTENT_MAP_HOLE; | 1922 | em->block_start = EXTENT_MAP_HOLE; |
1909 | em->block_end = EXTENT_MAP_HOLE; | ||
1910 | goto insert; | 1923 | goto insert; |
1911 | } | 1924 | } |
1912 | bytenr += btrfs_file_extent_offset(leaf, item); | 1925 | bytenr += btrfs_file_extent_offset(leaf, item); |
1913 | em->block_start = bytenr; | 1926 | em->block_start = bytenr; |
1914 | em->block_end = em->block_start + | ||
1915 | btrfs_file_extent_num_bytes(leaf, item) - 1; | ||
1916 | em->start = extent_start; | 1927 | em->start = extent_start; |
1917 | em->end = extent_end - 1; | 1928 | em->len = extent_end - extent_start; |
1918 | goto insert; | 1929 | goto insert; |
1919 | } else if (found_type == BTRFS_FILE_EXTENT_INLINE) { | 1930 | } else if (found_type == BTRFS_FILE_EXTENT_INLINE) { |
1920 | unsigned long ptr; | 1931 | unsigned long ptr; |
@@ -1925,25 +1936,24 @@ again: | |||
1925 | 1936 | ||
1926 | size = btrfs_file_extent_inline_len(leaf, btrfs_item_nr(leaf, | 1937 | size = btrfs_file_extent_inline_len(leaf, btrfs_item_nr(leaf, |
1927 | path->slots[0])); | 1938 | path->slots[0])); |
1928 | extent_end = (extent_start + size - 1) | | 1939 | extent_end = (extent_start + size + root->sectorsize - 1) & |
1929 | ((u64)root->sectorsize - 1); | 1940 | ~((u64)root->sectorsize - 1); |
1930 | if (start < extent_start || start >= extent_end) { | 1941 | if (start < extent_start || start >= extent_end) { |
1931 | em->start = start; | 1942 | em->start = start; |
1932 | if (start < extent_start) { | 1943 | if (start < extent_start) { |
1933 | if (end < extent_start) | 1944 | if (start + len <= extent_start) |
1934 | goto not_found; | 1945 | goto not_found; |
1935 | em->end = extent_end; | 1946 | em->len = extent_end - extent_start; |
1936 | } else { | 1947 | } else { |
1937 | em->end = end; | 1948 | em->len = len; |
1938 | } | 1949 | } |
1939 | goto not_found_em; | 1950 | goto not_found_em; |
1940 | } | 1951 | } |
1941 | em->block_start = EXTENT_MAP_INLINE; | 1952 | em->block_start = EXTENT_MAP_INLINE; |
1942 | em->block_end = EXTENT_MAP_INLINE; | ||
1943 | 1953 | ||
1944 | if (!page) { | 1954 | if (!page) { |
1945 | em->start = extent_start; | 1955 | em->start = extent_start; |
1946 | em->end = extent_start + size - 1; | 1956 | em->len = size; |
1947 | goto out; | 1957 | goto out; |
1948 | } | 1958 | } |
1949 | 1959 | ||
@@ -1952,8 +1962,7 @@ again: | |||
1952 | copy_size = min_t(u64, PAGE_CACHE_SIZE - page_offset, | 1962 | copy_size = min_t(u64, PAGE_CACHE_SIZE - page_offset, |
1953 | size - extent_offset); | 1963 | size - extent_offset); |
1954 | em->start = extent_start + extent_offset; | 1964 | em->start = extent_start + extent_offset; |
1955 | em->end = (em->start + copy_size -1) | | 1965 | em->len = copy_size; |
1956 | ((u64)root->sectorsize -1); | ||
1957 | map = kmap(page); | 1966 | map = kmap(page); |
1958 | ptr = btrfs_file_extent_inline_start(item) + extent_offset; | 1967 | ptr = btrfs_file_extent_inline_start(item) + extent_offset; |
1959 | if (create == 0 && !PageUptodate(page)) { | 1968 | if (create == 0 && !PageUptodate(page)) { |
@@ -1974,7 +1983,8 @@ again: | |||
1974 | btrfs_mark_buffer_dirty(leaf); | 1983 | btrfs_mark_buffer_dirty(leaf); |
1975 | } | 1984 | } |
1976 | kunmap(page); | 1985 | kunmap(page); |
1977 | set_extent_uptodate(em_tree, em->start, em->end, GFP_NOFS); | 1986 | set_extent_uptodate(io_tree, em->start, |
1987 | extent_map_end(em) - 1, GFP_NOFS); | ||
1978 | goto insert; | 1988 | goto insert; |
1979 | } else { | 1989 | } else { |
1980 | printk("unkknown found_type %d\n", found_type); | 1990 | printk("unkknown found_type %d\n", found_type); |
@@ -1982,33 +1992,29 @@ again: | |||
1982 | } | 1992 | } |
1983 | not_found: | 1993 | not_found: |
1984 | em->start = start; | 1994 | em->start = start; |
1985 | em->end = end; | 1995 | em->len = len; |
1986 | not_found_em: | 1996 | not_found_em: |
1987 | em->block_start = EXTENT_MAP_HOLE; | 1997 | em->block_start = EXTENT_MAP_HOLE; |
1988 | em->block_end = EXTENT_MAP_HOLE; | ||
1989 | insert: | 1998 | insert: |
1990 | btrfs_release_path(root, path); | 1999 | btrfs_release_path(root, path); |
1991 | if (em->start > start || em->end < start) { | 2000 | if (em->start > start || extent_map_end(em) <= start) { |
1992 | printk("bad extent! em: [%Lu %Lu] passed [%Lu %Lu]\n", em->start, em->end, start, end); | 2001 | printk("bad extent! em: [%Lu %Lu] passed [%Lu %Lu]\n", em->start, em->len, start, len); |
1993 | err = -EIO; | 2002 | err = -EIO; |
1994 | goto out; | 2003 | goto out; |
1995 | } | 2004 | } |
2005 | |||
2006 | err = 0; | ||
2007 | spin_lock(&em_tree->lock); | ||
1996 | ret = add_extent_mapping(em_tree, em); | 2008 | ret = add_extent_mapping(em_tree, em); |
1997 | if (ret == -EEXIST) { | 2009 | if (ret == -EEXIST) { |
1998 | free_extent_map(em); | 2010 | free_extent_map(em); |
1999 | em = NULL; | 2011 | em = lookup_extent_mapping(em_tree, start, len); |
2000 | if (0 && failed_insert == 1) { | 2012 | if (!em) { |
2001 | btrfs_drop_extent_cache(inode, start, end); | ||
2002 | } | ||
2003 | failed_insert++; | ||
2004 | if (failed_insert > 5) { | ||
2005 | printk("failing to insert %Lu %Lu\n", start, end); | ||
2006 | err = -EIO; | 2013 | err = -EIO; |
2007 | goto out; | 2014 | printk("failing to insert %Lu %Lu\n", start, len); |
2008 | } | 2015 | } |
2009 | goto again; | ||
2010 | } | 2016 | } |
2011 | err = 0; | 2017 | spin_unlock(&em_tree->lock); |
2012 | out: | 2018 | out: |
2013 | btrfs_free_path(path); | 2019 | btrfs_free_path(path); |
2014 | if (trans) { | 2020 | if (trans) { |
@@ -2032,14 +2038,14 @@ static sector_t btrfs_bmap(struct address_space *mapping, sector_t iblock) | |||
2032 | 2038 | ||
2033 | int btrfs_readpage(struct file *file, struct page *page) | 2039 | int btrfs_readpage(struct file *file, struct page *page) |
2034 | { | 2040 | { |
2035 | struct extent_map_tree *tree; | 2041 | struct extent_io_tree *tree; |
2036 | tree = &BTRFS_I(page->mapping->host)->extent_tree; | 2042 | tree = &BTRFS_I(page->mapping->host)->io_tree; |
2037 | return extent_read_full_page(tree, page, btrfs_get_extent); | 2043 | return extent_read_full_page(tree, page, btrfs_get_extent); |
2038 | } | 2044 | } |
2039 | 2045 | ||
2040 | static int btrfs_writepage(struct page *page, struct writeback_control *wbc) | 2046 | static int btrfs_writepage(struct page *page, struct writeback_control *wbc) |
2041 | { | 2047 | { |
2042 | struct extent_map_tree *tree; | 2048 | struct extent_io_tree *tree; |
2043 | 2049 | ||
2044 | 2050 | ||
2045 | if (current->flags & PF_MEMALLOC) { | 2051 | if (current->flags & PF_MEMALLOC) { |
@@ -2047,15 +2053,15 @@ static int btrfs_writepage(struct page *page, struct writeback_control *wbc) | |||
2047 | unlock_page(page); | 2053 | unlock_page(page); |
2048 | return 0; | 2054 | return 0; |
2049 | } | 2055 | } |
2050 | tree = &BTRFS_I(page->mapping->host)->extent_tree; | 2056 | tree = &BTRFS_I(page->mapping->host)->io_tree; |
2051 | return extent_write_full_page(tree, page, btrfs_get_extent, wbc); | 2057 | return extent_write_full_page(tree, page, btrfs_get_extent, wbc); |
2052 | } | 2058 | } |
2053 | 2059 | ||
2054 | static int btrfs_writepages(struct address_space *mapping, | 2060 | static int btrfs_writepages(struct address_space *mapping, |
2055 | struct writeback_control *wbc) | 2061 | struct writeback_control *wbc) |
2056 | { | 2062 | { |
2057 | struct extent_map_tree *tree; | 2063 | struct extent_io_tree *tree; |
2058 | tree = &BTRFS_I(mapping->host)->extent_tree; | 2064 | tree = &BTRFS_I(mapping->host)->io_tree; |
2059 | return extent_writepages(tree, mapping, btrfs_get_extent, wbc); | 2065 | return extent_writepages(tree, mapping, btrfs_get_extent, wbc); |
2060 | } | 2066 | } |
2061 | 2067 | ||
@@ -2063,19 +2069,21 @@ static int | |||
2063 | btrfs_readpages(struct file *file, struct address_space *mapping, | 2069 | btrfs_readpages(struct file *file, struct address_space *mapping, |
2064 | struct list_head *pages, unsigned nr_pages) | 2070 | struct list_head *pages, unsigned nr_pages) |
2065 | { | 2071 | { |
2066 | struct extent_map_tree *tree; | 2072 | struct extent_io_tree *tree; |
2067 | tree = &BTRFS_I(mapping->host)->extent_tree; | 2073 | tree = &BTRFS_I(mapping->host)->io_tree; |
2068 | return extent_readpages(tree, mapping, pages, nr_pages, | 2074 | return extent_readpages(tree, mapping, pages, nr_pages, |
2069 | btrfs_get_extent); | 2075 | btrfs_get_extent); |
2070 | } | 2076 | } |
2071 | 2077 | ||
2072 | static int btrfs_releasepage(struct page *page, gfp_t unused_gfp_flags) | 2078 | static int btrfs_releasepage(struct page *page, gfp_t unused_gfp_flags) |
2073 | { | 2079 | { |
2074 | struct extent_map_tree *tree; | 2080 | struct extent_io_tree *tree; |
2081 | struct extent_map_tree *map; | ||
2075 | int ret; | 2082 | int ret; |
2076 | 2083 | ||
2077 | tree = &BTRFS_I(page->mapping->host)->extent_tree; | 2084 | tree = &BTRFS_I(page->mapping->host)->io_tree; |
2078 | ret = try_release_extent_mapping(tree, page); | 2085 | map = &BTRFS_I(page->mapping->host)->extent_tree; |
2086 | ret = try_release_extent_mapping(map, tree, page); | ||
2079 | if (ret == 1) { | 2087 | if (ret == 1) { |
2080 | ClearPagePrivate(page); | 2088 | ClearPagePrivate(page); |
2081 | set_page_private(page, 0); | 2089 | set_page_private(page, 0); |
@@ -2086,9 +2094,9 @@ static int btrfs_releasepage(struct page *page, gfp_t unused_gfp_flags) | |||
2086 | 2094 | ||
2087 | static void btrfs_invalidatepage(struct page *page, unsigned long offset) | 2095 | static void btrfs_invalidatepage(struct page *page, unsigned long offset) |
2088 | { | 2096 | { |
2089 | struct extent_map_tree *tree; | 2097 | struct extent_io_tree *tree; |
2090 | 2098 | ||
2091 | tree = &BTRFS_I(page->mapping->host)->extent_tree; | 2099 | tree = &BTRFS_I(page->mapping->host)->io_tree; |
2092 | extent_invalidatepage(tree, page, offset); | 2100 | extent_invalidatepage(tree, page, offset); |
2093 | btrfs_releasepage(page, GFP_NOFS); | 2101 | btrfs_releasepage(page, GFP_NOFS); |
2094 | } | 2102 | } |
@@ -2374,7 +2382,7 @@ unsigned long btrfs_force_ra(struct address_space *mapping, | |||
2374 | int btrfs_defrag_file(struct file *file) { | 2382 | int btrfs_defrag_file(struct file *file) { |
2375 | struct inode *inode = fdentry(file)->d_inode; | 2383 | struct inode *inode = fdentry(file)->d_inode; |
2376 | struct btrfs_root *root = BTRFS_I(inode)->root; | 2384 | struct btrfs_root *root = BTRFS_I(inode)->root; |
2377 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; | 2385 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
2378 | struct page *page; | 2386 | struct page *page; |
2379 | unsigned long last_index; | 2387 | unsigned long last_index; |
2380 | unsigned long ra_index = 0; | 2388 | unsigned long ra_index = 0; |
@@ -2414,13 +2422,13 @@ int btrfs_defrag_file(struct file *file) { | |||
2414 | page_start = (u64)page->index << PAGE_CACHE_SHIFT; | 2422 | page_start = (u64)page->index << PAGE_CACHE_SHIFT; |
2415 | page_end = page_start + PAGE_CACHE_SIZE - 1; | 2423 | page_end = page_start + PAGE_CACHE_SIZE - 1; |
2416 | 2424 | ||
2417 | lock_extent(em_tree, page_start, page_end, GFP_NOFS); | 2425 | lock_extent(io_tree, page_start, page_end, GFP_NOFS); |
2418 | delalloc_start = page_start; | 2426 | delalloc_start = page_start; |
2419 | existing_delalloc = | 2427 | existing_delalloc = |
2420 | count_range_bits(&BTRFS_I(inode)->extent_tree, | 2428 | count_range_bits(&BTRFS_I(inode)->io_tree, |
2421 | &delalloc_start, page_end, | 2429 | &delalloc_start, page_end, |
2422 | PAGE_CACHE_SIZE, EXTENT_DELALLOC); | 2430 | PAGE_CACHE_SIZE, EXTENT_DELALLOC); |
2423 | set_extent_delalloc(em_tree, page_start, | 2431 | set_extent_delalloc(io_tree, page_start, |
2424 | page_end, GFP_NOFS); | 2432 | page_end, GFP_NOFS); |
2425 | 2433 | ||
2426 | spin_lock(&root->fs_info->delalloc_lock); | 2434 | spin_lock(&root->fs_info->delalloc_lock); |
@@ -2428,7 +2436,7 @@ int btrfs_defrag_file(struct file *file) { | |||
2428 | existing_delalloc; | 2436 | existing_delalloc; |
2429 | spin_unlock(&root->fs_info->delalloc_lock); | 2437 | spin_unlock(&root->fs_info->delalloc_lock); |
2430 | 2438 | ||
2431 | unlock_extent(em_tree, page_start, page_end, GFP_NOFS); | 2439 | unlock_extent(io_tree, page_start, page_end, GFP_NOFS); |
2432 | set_page_dirty(page); | 2440 | set_page_dirty(page); |
2433 | unlock_page(page); | 2441 | unlock_page(page); |
2434 | page_cache_release(page); | 2442 | page_cache_release(page); |
@@ -2842,9 +2850,10 @@ static int btrfs_symlink(struct inode *dir, struct dentry *dentry, | |||
2842 | inode->i_mapping->a_ops = &btrfs_aops; | 2850 | inode->i_mapping->a_ops = &btrfs_aops; |
2843 | inode->i_fop = &btrfs_file_operations; | 2851 | inode->i_fop = &btrfs_file_operations; |
2844 | inode->i_op = &btrfs_file_inode_operations; | 2852 | inode->i_op = &btrfs_file_inode_operations; |
2845 | extent_map_tree_init(&BTRFS_I(inode)->extent_tree, | 2853 | extent_map_tree_init(&BTRFS_I(inode)->extent_tree, GFP_NOFS); |
2854 | extent_io_tree_init(&BTRFS_I(inode)->io_tree, | ||
2846 | inode->i_mapping, GFP_NOFS); | 2855 | inode->i_mapping, GFP_NOFS); |
2847 | BTRFS_I(inode)->extent_tree.ops = &btrfs_extent_map_ops; | 2856 | BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops; |
2848 | } | 2857 | } |
2849 | dir->i_sb->s_dirt = 1; | 2858 | dir->i_sb->s_dirt = 1; |
2850 | btrfs_update_inode_block_group(trans, inode); | 2859 | btrfs_update_inode_block_group(trans, inode); |
@@ -2934,7 +2943,7 @@ static struct file_operations btrfs_dir_file_operations = { | |||
2934 | #endif | 2943 | #endif |
2935 | }; | 2944 | }; |
2936 | 2945 | ||
2937 | static struct extent_map_ops btrfs_extent_map_ops = { | 2946 | static struct extent_io_ops btrfs_extent_io_ops = { |
2938 | .fill_delalloc = run_delalloc_range, | 2947 | .fill_delalloc = run_delalloc_range, |
2939 | .writepage_io_hook = btrfs_writepage_io_hook, | 2948 | .writepage_io_hook = btrfs_writepage_io_hook, |
2940 | .readpage_io_hook = btrfs_readpage_io_hook, | 2949 | .readpage_io_hook = btrfs_readpage_io_hook, |
diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c index 8b52c69fda2e..f8a1016600b1 100644 --- a/fs/btrfs/super.c +++ b/fs/btrfs/super.c | |||
@@ -468,10 +468,15 @@ static int __init init_btrfs_fs(void) | |||
468 | err = btrfs_init_cachep(); | 468 | err = btrfs_init_cachep(); |
469 | if (err) | 469 | if (err) |
470 | goto free_transaction_sys; | 470 | goto free_transaction_sys; |
471 | err = extent_map_init(); | 471 | |
472 | err = extent_io_init(); | ||
472 | if (err) | 473 | if (err) |
473 | goto free_cachep; | 474 | goto free_cachep; |
474 | 475 | ||
476 | err = extent_map_init(); | ||
477 | if (err) | ||
478 | goto free_extent_io; | ||
479 | |||
475 | err = register_filesystem(&btrfs_fs_type); | 480 | err = register_filesystem(&btrfs_fs_type); |
476 | if (err) | 481 | if (err) |
477 | goto free_extent_map; | 482 | goto free_extent_map; |
@@ -479,6 +484,8 @@ static int __init init_btrfs_fs(void) | |||
479 | 484 | ||
480 | free_extent_map: | 485 | free_extent_map: |
481 | extent_map_exit(); | 486 | extent_map_exit(); |
487 | free_extent_io: | ||
488 | extent_io_exit(); | ||
482 | free_cachep: | 489 | free_cachep: |
483 | btrfs_destroy_cachep(); | 490 | btrfs_destroy_cachep(); |
484 | free_transaction_sys: | 491 | free_transaction_sys: |
@@ -492,6 +499,7 @@ static void __exit exit_btrfs_fs(void) | |||
492 | btrfs_exit_transaction_sys(); | 499 | btrfs_exit_transaction_sys(); |
493 | btrfs_destroy_cachep(); | 500 | btrfs_destroy_cachep(); |
494 | extent_map_exit(); | 501 | extent_map_exit(); |
502 | extent_io_exit(); | ||
495 | unregister_filesystem(&btrfs_fs_type); | 503 | unregister_filesystem(&btrfs_fs_type); |
496 | btrfs_exit_sysfs(); | 504 | btrfs_exit_sysfs(); |
497 | } | 505 | } |
diff --git a/fs/btrfs/transaction.c b/fs/btrfs/transaction.c index 163c01a24498..b4a1bc62a784 100644 --- a/fs/btrfs/transaction.c +++ b/fs/btrfs/transaction.c | |||
@@ -70,7 +70,7 @@ static int join_transaction(struct btrfs_root *root) | |||
70 | INIT_LIST_HEAD(&cur_trans->pending_snapshots); | 70 | INIT_LIST_HEAD(&cur_trans->pending_snapshots); |
71 | list_add_tail(&cur_trans->list, &root->fs_info->trans_list); | 71 | list_add_tail(&cur_trans->list, &root->fs_info->trans_list); |
72 | btrfs_ordered_inode_tree_init(&cur_trans->ordered_inode_tree); | 72 | btrfs_ordered_inode_tree_init(&cur_trans->ordered_inode_tree); |
73 | extent_map_tree_init(&cur_trans->dirty_pages, | 73 | extent_io_tree_init(&cur_trans->dirty_pages, |
74 | root->fs_info->btree_inode->i_mapping, | 74 | root->fs_info->btree_inode->i_mapping, |
75 | GFP_NOFS); | 75 | GFP_NOFS); |
76 | } else { | 76 | } else { |
@@ -153,7 +153,7 @@ int btrfs_write_and_wait_transaction(struct btrfs_trans_handle *trans, | |||
153 | int ret; | 153 | int ret; |
154 | int err; | 154 | int err; |
155 | int werr = 0; | 155 | int werr = 0; |
156 | struct extent_map_tree *dirty_pages; | 156 | struct extent_io_tree *dirty_pages; |
157 | struct page *page; | 157 | struct page *page; |
158 | struct inode *btree_inode = root->fs_info->btree_inode; | 158 | struct inode *btree_inode = root->fs_info->btree_inode; |
159 | u64 start; | 159 | u64 start; |
@@ -610,7 +610,7 @@ int btrfs_commit_transaction(struct btrfs_trans_handle *trans, | |||
610 | struct btrfs_transaction *cur_trans; | 610 | struct btrfs_transaction *cur_trans; |
611 | struct btrfs_transaction *prev_trans = NULL; | 611 | struct btrfs_transaction *prev_trans = NULL; |
612 | struct list_head dirty_fs_roots; | 612 | struct list_head dirty_fs_roots; |
613 | struct extent_map_tree *pinned_copy; | 613 | struct extent_io_tree *pinned_copy; |
614 | DEFINE_WAIT(wait); | 614 | DEFINE_WAIT(wait); |
615 | int ret; | 615 | int ret; |
616 | 616 | ||
@@ -639,7 +639,7 @@ int btrfs_commit_transaction(struct btrfs_trans_handle *trans, | |||
639 | if (!pinned_copy) | 639 | if (!pinned_copy) |
640 | return -ENOMEM; | 640 | return -ENOMEM; |
641 | 641 | ||
642 | extent_map_tree_init(pinned_copy, | 642 | extent_io_tree_init(pinned_copy, |
643 | root->fs_info->btree_inode->i_mapping, GFP_NOFS); | 643 | root->fs_info->btree_inode->i_mapping, GFP_NOFS); |
644 | 644 | ||
645 | trans->transaction->in_commit = 1; | 645 | trans->transaction->in_commit = 1; |
diff --git a/fs/btrfs/transaction.h b/fs/btrfs/transaction.h index fd52e9b23922..c3172ddb3321 100644 --- a/fs/btrfs/transaction.h +++ b/fs/btrfs/transaction.h | |||
@@ -29,7 +29,7 @@ struct btrfs_transaction { | |||
29 | int use_count; | 29 | int use_count; |
30 | int commit_done; | 30 | int commit_done; |
31 | struct list_head list; | 31 | struct list_head list; |
32 | struct extent_map_tree dirty_pages; | 32 | struct extent_io_tree dirty_pages; |
33 | unsigned long start_time; | 33 | unsigned long start_time; |
34 | struct btrfs_ordered_inode_tree ordered_inode_tree; | 34 | struct btrfs_ordered_inode_tree ordered_inode_tree; |
35 | wait_queue_head_t writer_wait; | 35 | wait_queue_head_t writer_wait; |