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-rw-r--r--fs/ext4/extents.c131
1 files changed, 114 insertions, 17 deletions
diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
index e2eab196875f..ac77d8b8251d 100644
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -152,6 +152,8 @@ static ext4_fsblk_t ext4_ext_find_goal(struct inode *inode,
152 ext4_fsblk_t bg_start; 152 ext4_fsblk_t bg_start;
153 ext4_fsblk_t last_block; 153 ext4_fsblk_t last_block;
154 ext4_grpblk_t colour; 154 ext4_grpblk_t colour;
155 ext4_group_t block_group;
156 int flex_size = ext4_flex_bg_size(EXT4_SB(inode->i_sb));
155 int depth; 157 int depth;
156 158
157 if (path) { 159 if (path) {
@@ -170,10 +172,31 @@ static ext4_fsblk_t ext4_ext_find_goal(struct inode *inode,
170 } 172 }
171 173
172 /* OK. use inode's group */ 174 /* OK. use inode's group */
173 bg_start = (ei->i_block_group * EXT4_BLOCKS_PER_GROUP(inode->i_sb)) + 175 block_group = ei->i_block_group;
176 if (flex_size >= EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME) {
177 /*
178 * If there are at least EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME
179 * block groups per flexgroup, reserve the first block
180 * group for directories and special files. Regular
181 * files will start at the second block group. This
182 * tends to speed up directory access and improves
183 * fsck times.
184 */
185 block_group &= ~(flex_size-1);
186 if (S_ISREG(inode->i_mode))
187 block_group++;
188 }
189 bg_start = (block_group * EXT4_BLOCKS_PER_GROUP(inode->i_sb)) +
174 le32_to_cpu(EXT4_SB(inode->i_sb)->s_es->s_first_data_block); 190 le32_to_cpu(EXT4_SB(inode->i_sb)->s_es->s_first_data_block);
175 last_block = ext4_blocks_count(EXT4_SB(inode->i_sb)->s_es) - 1; 191 last_block = ext4_blocks_count(EXT4_SB(inode->i_sb)->s_es) - 1;
176 192
193 /*
194 * If we are doing delayed allocation, we don't need take
195 * colour into account.
196 */
197 if (test_opt(inode->i_sb, DELALLOC))
198 return bg_start;
199
177 if (bg_start + EXT4_BLOCKS_PER_GROUP(inode->i_sb) <= last_block) 200 if (bg_start + EXT4_BLOCKS_PER_GROUP(inode->i_sb) <= last_block)
178 colour = (current->pid % 16) * 201 colour = (current->pid % 16) *
179 (EXT4_BLOCKS_PER_GROUP(inode->i_sb) / 16); 202 (EXT4_BLOCKS_PER_GROUP(inode->i_sb) / 16);
@@ -301,7 +324,64 @@ ext4_ext_max_entries(struct inode *inode, int depth)
301 return max; 324 return max;
302} 325}
303 326
304static int __ext4_ext_check_header(const char *function, struct inode *inode, 327static int ext4_valid_extent(struct inode *inode, struct ext4_extent *ext)
328{
329 ext4_fsblk_t block = ext_pblock(ext);
330 int len = ext4_ext_get_actual_len(ext);
331 struct ext4_super_block *es = EXT4_SB(inode->i_sb)->s_es;
332 if (unlikely(block < le32_to_cpu(es->s_first_data_block) ||
333 ((block + len) > ext4_blocks_count(es))))
334 return 0;
335 else
336 return 1;
337}
338
339static int ext4_valid_extent_idx(struct inode *inode,
340 struct ext4_extent_idx *ext_idx)
341{
342 ext4_fsblk_t block = idx_pblock(ext_idx);
343 struct ext4_super_block *es = EXT4_SB(inode->i_sb)->s_es;
344 if (unlikely(block < le32_to_cpu(es->s_first_data_block) ||
345 (block > ext4_blocks_count(es))))
346 return 0;
347 else
348 return 1;
349}
350
351static int ext4_valid_extent_entries(struct inode *inode,
352 struct ext4_extent_header *eh,
353 int depth)
354{
355 struct ext4_extent *ext;
356 struct ext4_extent_idx *ext_idx;
357 unsigned short entries;
358 if (eh->eh_entries == 0)
359 return 1;
360
361 entries = le16_to_cpu(eh->eh_entries);
362
363 if (depth == 0) {
364 /* leaf entries */
365 ext = EXT_FIRST_EXTENT(eh);
366 while (entries) {
367 if (!ext4_valid_extent(inode, ext))
368 return 0;
369 ext++;
370 entries--;
371 }
372 } else {
373 ext_idx = EXT_FIRST_INDEX(eh);
374 while (entries) {
375 if (!ext4_valid_extent_idx(inode, ext_idx))
376 return 0;
377 ext_idx++;
378 entries--;
379 }
380 }
381 return 1;
382}
383
384static int __ext4_ext_check(const char *function, struct inode *inode,
305 struct ext4_extent_header *eh, 385 struct ext4_extent_header *eh,
306 int depth) 386 int depth)
307{ 387{
@@ -329,11 +409,15 @@ static int __ext4_ext_check_header(const char *function, struct inode *inode,
329 error_msg = "invalid eh_entries"; 409 error_msg = "invalid eh_entries";
330 goto corrupted; 410 goto corrupted;
331 } 411 }
412 if (!ext4_valid_extent_entries(inode, eh, depth)) {
413 error_msg = "invalid extent entries";
414 goto corrupted;
415 }
332 return 0; 416 return 0;
333 417
334corrupted: 418corrupted:
335 ext4_error(inode->i_sb, function, 419 ext4_error(inode->i_sb, function,
336 "bad header in inode #%lu: %s - magic %x, " 420 "bad header/extent in inode #%lu: %s - magic %x, "
337 "entries %u, max %u(%u), depth %u(%u)", 421 "entries %u, max %u(%u), depth %u(%u)",
338 inode->i_ino, error_msg, le16_to_cpu(eh->eh_magic), 422 inode->i_ino, error_msg, le16_to_cpu(eh->eh_magic),
339 le16_to_cpu(eh->eh_entries), le16_to_cpu(eh->eh_max), 423 le16_to_cpu(eh->eh_entries), le16_to_cpu(eh->eh_max),
@@ -342,8 +426,13 @@ corrupted:
342 return -EIO; 426 return -EIO;
343} 427}
344 428
345#define ext4_ext_check_header(inode, eh, depth) \ 429#define ext4_ext_check(inode, eh, depth) \
346 __ext4_ext_check_header(__func__, inode, eh, depth) 430 __ext4_ext_check(__func__, inode, eh, depth)
431
432int ext4_ext_check_inode(struct inode *inode)
433{
434 return ext4_ext_check(inode, ext_inode_hdr(inode), ext_depth(inode));
435}
347 436
348#ifdef EXT_DEBUG 437#ifdef EXT_DEBUG
349static void ext4_ext_show_path(struct inode *inode, struct ext4_ext_path *path) 438static void ext4_ext_show_path(struct inode *inode, struct ext4_ext_path *path)
@@ -547,9 +636,6 @@ ext4_ext_find_extent(struct inode *inode, ext4_lblk_t block,
547 636
548 eh = ext_inode_hdr(inode); 637 eh = ext_inode_hdr(inode);
549 depth = ext_depth(inode); 638 depth = ext_depth(inode);
550 if (ext4_ext_check_header(inode, eh, depth))
551 return ERR_PTR(-EIO);
552
553 639
554 /* account possible depth increase */ 640 /* account possible depth increase */
555 if (!path) { 641 if (!path) {
@@ -565,6 +651,8 @@ ext4_ext_find_extent(struct inode *inode, ext4_lblk_t block,
565 i = depth; 651 i = depth;
566 /* walk through the tree */ 652 /* walk through the tree */
567 while (i) { 653 while (i) {
654 int need_to_validate = 0;
655
568 ext_debug("depth %d: num %d, max %d\n", 656 ext_debug("depth %d: num %d, max %d\n",
569 ppos, le16_to_cpu(eh->eh_entries), le16_to_cpu(eh->eh_max)); 657 ppos, le16_to_cpu(eh->eh_entries), le16_to_cpu(eh->eh_max));
570 658
@@ -573,10 +661,17 @@ ext4_ext_find_extent(struct inode *inode, ext4_lblk_t block,
573 path[ppos].p_depth = i; 661 path[ppos].p_depth = i;
574 path[ppos].p_ext = NULL; 662 path[ppos].p_ext = NULL;
575 663
576 bh = sb_bread(inode->i_sb, path[ppos].p_block); 664 bh = sb_getblk(inode->i_sb, path[ppos].p_block);
577 if (!bh) 665 if (unlikely(!bh))
578 goto err; 666 goto err;
579 667 if (!bh_uptodate_or_lock(bh)) {
668 if (bh_submit_read(bh) < 0) {
669 put_bh(bh);
670 goto err;
671 }
672 /* validate the extent entries */
673 need_to_validate = 1;
674 }
580 eh = ext_block_hdr(bh); 675 eh = ext_block_hdr(bh);
581 ppos++; 676 ppos++;
582 BUG_ON(ppos > depth); 677 BUG_ON(ppos > depth);
@@ -584,7 +679,7 @@ ext4_ext_find_extent(struct inode *inode, ext4_lblk_t block,
584 path[ppos].p_hdr = eh; 679 path[ppos].p_hdr = eh;
585 i--; 680 i--;
586 681
587 if (ext4_ext_check_header(inode, eh, i)) 682 if (need_to_validate && ext4_ext_check(inode, eh, i))
588 goto err; 683 goto err;
589 } 684 }
590 685
@@ -1122,7 +1217,8 @@ ext4_ext_search_right(struct inode *inode, struct ext4_ext_path *path,
1122 struct ext4_extent_idx *ix; 1217 struct ext4_extent_idx *ix;
1123 struct ext4_extent *ex; 1218 struct ext4_extent *ex;
1124 ext4_fsblk_t block; 1219 ext4_fsblk_t block;
1125 int depth, ee_len; 1220 int depth; /* Note, NOT eh_depth; depth from top of tree */
1221 int ee_len;
1126 1222
1127 BUG_ON(path == NULL); 1223 BUG_ON(path == NULL);
1128 depth = path->p_depth; 1224 depth = path->p_depth;
@@ -1179,7 +1275,8 @@ got_index:
1179 if (bh == NULL) 1275 if (bh == NULL)
1180 return -EIO; 1276 return -EIO;
1181 eh = ext_block_hdr(bh); 1277 eh = ext_block_hdr(bh);
1182 if (ext4_ext_check_header(inode, eh, depth)) { 1278 /* subtract from p_depth to get proper eh_depth */
1279 if (ext4_ext_check(inode, eh, path->p_depth - depth)) {
1183 put_bh(bh); 1280 put_bh(bh);
1184 return -EIO; 1281 return -EIO;
1185 } 1282 }
@@ -1192,7 +1289,7 @@ got_index:
1192 if (bh == NULL) 1289 if (bh == NULL)
1193 return -EIO; 1290 return -EIO;
1194 eh = ext_block_hdr(bh); 1291 eh = ext_block_hdr(bh);
1195 if (ext4_ext_check_header(inode, eh, path->p_depth - depth)) { 1292 if (ext4_ext_check(inode, eh, path->p_depth - depth)) {
1196 put_bh(bh); 1293 put_bh(bh);
1197 return -EIO; 1294 return -EIO;
1198 } 1295 }
@@ -2135,7 +2232,7 @@ static int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start)
2135 return -ENOMEM; 2232 return -ENOMEM;
2136 } 2233 }
2137 path[0].p_hdr = ext_inode_hdr(inode); 2234 path[0].p_hdr = ext_inode_hdr(inode);
2138 if (ext4_ext_check_header(inode, path[0].p_hdr, depth)) { 2235 if (ext4_ext_check(inode, path[0].p_hdr, depth)) {
2139 err = -EIO; 2236 err = -EIO;
2140 goto out; 2237 goto out;
2141 } 2238 }
@@ -2189,7 +2286,7 @@ static int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start)
2189 err = -EIO; 2286 err = -EIO;
2190 break; 2287 break;
2191 } 2288 }
2192 if (ext4_ext_check_header(inode, ext_block_hdr(bh), 2289 if (ext4_ext_check(inode, ext_block_hdr(bh),
2193 depth - i - 1)) { 2290 depth - i - 1)) {
2194 err = -EIO; 2291 err = -EIO;
2195 break; 2292 break;