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-rw-r--r--fs/nilfs2/inode.c819
1 files changed, 819 insertions, 0 deletions
diff --git a/fs/nilfs2/inode.c b/fs/nilfs2/inode.c
new file mode 100644
index 000000000000..b4697d9d7e5d
--- /dev/null
+++ b/fs/nilfs2/inode.c
@@ -0,0 +1,819 @@
1/*
2 * inode.c - NILFS inode operations.
3 *
4 * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
19 *
20 * Written by Ryusuke Konishi <ryusuke@osrg.net>
21 *
22 */
23
24#include <linux/buffer_head.h>
25#include <linux/mpage.h>
26#include <linux/writeback.h>
27#include "nilfs.h"
28#include "segment.h"
29#include "page.h"
30#include "mdt.h"
31#include "cpfile.h"
32#include "ifile.h"
33
34
35/**
36 * nilfs_get_block() - get a file block on the filesystem (callback function)
37 * @inode - inode struct of the target file
38 * @blkoff - file block number
39 * @bh_result - buffer head to be mapped on
40 * @create - indicate whether allocating the block or not when it has not
41 * been allocated yet.
42 *
43 * This function does not issue actual read request of the specified data
44 * block. It is done by VFS.
45 * Bulk read for direct-io is not supported yet. (should be supported)
46 */
47int nilfs_get_block(struct inode *inode, sector_t blkoff,
48 struct buffer_head *bh_result, int create)
49{
50 struct nilfs_inode_info *ii = NILFS_I(inode);
51 unsigned long blknum = 0;
52 int err = 0, ret;
53 struct inode *dat = nilfs_dat_inode(NILFS_I_NILFS(inode));
54
55 /* This exclusion control is a workaround; should be revised */
56 down_read(&NILFS_MDT(dat)->mi_sem); /* XXX */
57 ret = nilfs_bmap_lookup(ii->i_bmap, (unsigned long)blkoff, &blknum);
58 up_read(&NILFS_MDT(dat)->mi_sem); /* XXX */
59 if (ret == 0) { /* found */
60 map_bh(bh_result, inode->i_sb, blknum);
61 goto out;
62 }
63 if (unlikely(ret == 1)) {
64 printk(KERN_ERR "nilfs_get_block: bmap_lookup returns "
65 "buffer_head pointer (blkoff=%llu, blknum=%lu)\n",
66 (unsigned long long)blkoff, blknum);
67 BUG();
68 }
69 /* data block was not found */
70 if (ret == -ENOENT && create) {
71 struct nilfs_transaction_info ti;
72
73 bh_result->b_blocknr = 0;
74 err = nilfs_transaction_begin(inode->i_sb, &ti, 1);
75 if (unlikely(err))
76 goto out;
77 err = nilfs_bmap_insert(ii->i_bmap, (unsigned long)blkoff,
78 (unsigned long)bh_result);
79 nilfs_transaction_end(inode->i_sb, !err);
80 if (unlikely(err != 0)) {
81 if (err == -EEXIST) {
82 /*
83 * The get_block() function could be called
84 * from multiple callers for an inode.
85 * However, the page having this block must
86 * be locked in this case.
87 */
88 printk(KERN_ERR
89 "nilfs_get_block: a race condition "
90 "while inserting a data block. "
91 "(inode number=%lu, file block "
92 "offset=%llu)\n",
93 inode->i_ino,
94 (unsigned long long)blkoff);
95 BUG();
96 } else if (err == -EINVAL) {
97 nilfs_error(inode->i_sb, __func__,
98 "broken bmap (inode=%lu)\n",
99 inode->i_ino);
100 err = -EIO;
101 }
102 goto out;
103 }
104 /* Error handling should be detailed */
105 set_buffer_new(bh_result);
106 map_bh(bh_result, inode->i_sb, 0); /* dbn must be changed
107 to proper value */
108 } else if (ret == -ENOENT) {
109 /* not found is not error (e.g. hole); must return without
110 the mapped state flag. */
111 ;
112 } else {
113 err = ret;
114 }
115
116 out:
117 return err;
118}
119
120/**
121 * nilfs_readpage() - implement readpage() method of nilfs_aops {}
122 * address_space_operations.
123 * @file - file struct of the file to be read
124 * @page - the page to be read
125 */
126static int nilfs_readpage(struct file *file, struct page *page)
127{
128 return mpage_readpage(page, nilfs_get_block);
129}
130
131/**
132 * nilfs_readpages() - implement readpages() method of nilfs_aops {}
133 * address_space_operations.
134 * @file - file struct of the file to be read
135 * @mapping - address_space struct used for reading multiple pages
136 * @pages - the pages to be read
137 * @nr_pages - number of pages to be read
138 */
139static int nilfs_readpages(struct file *file, struct address_space *mapping,
140 struct list_head *pages, unsigned nr_pages)
141{
142 return mpage_readpages(mapping, pages, nr_pages, nilfs_get_block);
143}
144
145static int nilfs_writepages(struct address_space *mapping,
146 struct writeback_control *wbc)
147{
148 /* This empty method is required not to call generic_writepages() */
149 return 0;
150}
151
152static int nilfs_writepage(struct page *page, struct writeback_control *wbc)
153{
154 struct inode *inode = page->mapping->host;
155 int err;
156
157 redirty_page_for_writepage(wbc, page);
158 unlock_page(page);
159
160 if (wbc->sync_mode == WB_SYNC_ALL) {
161 err = nilfs_construct_segment(inode->i_sb);
162 if (unlikely(err))
163 return err;
164 } else if (wbc->for_reclaim)
165 nilfs_flush_segment(inode->i_sb, inode->i_ino);
166
167 return 0;
168}
169
170static int nilfs_set_page_dirty(struct page *page)
171{
172 int ret = __set_page_dirty_buffers(page);
173
174 if (ret) {
175 struct inode *inode = page->mapping->host;
176 struct nilfs_sb_info *sbi = NILFS_SB(inode->i_sb);
177 unsigned nr_dirty = 1 << (PAGE_SHIFT - inode->i_blkbits);
178
179 nilfs_set_file_dirty(sbi, inode, nr_dirty);
180 }
181 return ret;
182}
183
184static int nilfs_write_begin(struct file *file, struct address_space *mapping,
185 loff_t pos, unsigned len, unsigned flags,
186 struct page **pagep, void **fsdata)
187
188{
189 struct inode *inode = mapping->host;
190 int err = nilfs_transaction_begin(inode->i_sb, NULL, 1);
191
192 if (unlikely(err))
193 return err;
194
195 *pagep = NULL;
196 err = block_write_begin(file, mapping, pos, len, flags, pagep,
197 fsdata, nilfs_get_block);
198 if (unlikely(err))
199 nilfs_transaction_end(inode->i_sb, 0);
200 return err;
201}
202
203static int nilfs_write_end(struct file *file, struct address_space *mapping,
204 loff_t pos, unsigned len, unsigned copied,
205 struct page *page, void *fsdata)
206{
207 struct inode *inode = mapping->host;
208 unsigned start = pos & (PAGE_CACHE_SIZE - 1);
209 unsigned nr_dirty;
210 int err;
211
212 nr_dirty = nilfs_page_count_clean_buffers(page, start,
213 start + copied);
214 copied = generic_write_end(file, mapping, pos, len, copied, page,
215 fsdata);
216 nilfs_set_file_dirty(NILFS_SB(inode->i_sb), inode, nr_dirty);
217 err = nilfs_transaction_end(inode->i_sb, 1);
218 return err ? : copied;
219}
220
221static ssize_t
222nilfs_direct_IO(int rw, struct kiocb *iocb, const struct iovec *iov,
223 loff_t offset, unsigned long nr_segs)
224{
225 struct file *file = iocb->ki_filp;
226 struct inode *inode = file->f_mapping->host;
227 ssize_t size;
228 int err;
229
230 err = nilfs_construct_dsync_segment(inode->i_sb, inode);
231 if (unlikely(err))
232 return err;
233
234 if (rw == WRITE)
235 return 0;
236
237 /* Needs synchronization with the cleaner */
238 size = blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov,
239 offset, nr_segs, nilfs_get_block, NULL);
240 return size;
241}
242
243struct address_space_operations nilfs_aops = {
244 .writepage = nilfs_writepage,
245 .readpage = nilfs_readpage,
246 /* .sync_page = nilfs_sync_page, */
247 .writepages = nilfs_writepages,
248 .set_page_dirty = nilfs_set_page_dirty,
249 .readpages = nilfs_readpages,
250 .write_begin = nilfs_write_begin,
251 .write_end = nilfs_write_end,
252 /* .releasepage = nilfs_releasepage, */
253 .invalidatepage = block_invalidatepage,
254 .direct_IO = nilfs_direct_IO,
255};
256
257struct inode *nilfs_new_inode(struct inode *dir, int mode)
258{
259 struct super_block *sb = dir->i_sb;
260 struct nilfs_sb_info *sbi = NILFS_SB(sb);
261 struct inode *inode;
262 struct nilfs_inode_info *ii;
263 int err = -ENOMEM;
264 ino_t ino;
265
266 inode = new_inode(sb);
267 if (unlikely(!inode))
268 goto failed;
269
270 mapping_set_gfp_mask(inode->i_mapping,
271 mapping_gfp_mask(inode->i_mapping) & ~__GFP_FS);
272
273 ii = NILFS_I(inode);
274 ii->i_state = 1 << NILFS_I_NEW;
275
276 err = nilfs_ifile_create_inode(sbi->s_ifile, &ino, &ii->i_bh);
277 if (unlikely(err))
278 goto failed_ifile_create_inode;
279 /* reference count of i_bh inherits from nilfs_mdt_read_block() */
280
281 atomic_inc(&sbi->s_inodes_count);
282
283 inode->i_uid = current_fsuid();
284 if (dir->i_mode & S_ISGID) {
285 inode->i_gid = dir->i_gid;
286 if (S_ISDIR(mode))
287 mode |= S_ISGID;
288 } else
289 inode->i_gid = current_fsgid();
290
291 inode->i_mode = mode;
292 inode->i_ino = ino;
293 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
294
295 if (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode)) {
296 err = nilfs_bmap_read(ii->i_bmap, NULL);
297 if (err < 0)
298 goto failed_bmap;
299
300 set_bit(NILFS_I_BMAP, &ii->i_state);
301 /* No lock is needed; iget() ensures it. */
302 }
303
304 ii->i_flags = NILFS_I(dir)->i_flags;
305 if (S_ISLNK(mode))
306 ii->i_flags &= ~(NILFS_IMMUTABLE_FL | NILFS_APPEND_FL);
307 if (!S_ISDIR(mode))
308 ii->i_flags &= ~NILFS_DIRSYNC_FL;
309
310 /* ii->i_file_acl = 0; */
311 /* ii->i_dir_acl = 0; */
312 ii->i_dtime = 0;
313 ii->i_dir_start_lookup = 0;
314#ifdef CONFIG_NILFS_FS_POSIX_ACL
315 ii->i_acl = NULL;
316 ii->i_default_acl = NULL;
317#endif
318 ii->i_cno = 0;
319 nilfs_set_inode_flags(inode);
320 spin_lock(&sbi->s_next_gen_lock);
321 inode->i_generation = sbi->s_next_generation++;
322 spin_unlock(&sbi->s_next_gen_lock);
323 insert_inode_hash(inode);
324
325 err = nilfs_init_acl(inode, dir);
326 if (unlikely(err))
327 goto failed_acl; /* never occur. When supporting
328 nilfs_init_acl(), proper cancellation of
329 above jobs should be considered */
330
331 mark_inode_dirty(inode);
332 return inode;
333
334 failed_acl:
335 failed_bmap:
336 inode->i_nlink = 0;
337 iput(inode); /* raw_inode will be deleted through
338 generic_delete_inode() */
339 goto failed;
340
341 failed_ifile_create_inode:
342 make_bad_inode(inode);
343 iput(inode); /* if i_nlink == 1, generic_forget_inode() will be
344 called */
345 failed:
346 return ERR_PTR(err);
347}
348
349void nilfs_free_inode(struct inode *inode)
350{
351 struct super_block *sb = inode->i_sb;
352 struct nilfs_sb_info *sbi = NILFS_SB(sb);
353
354 clear_inode(inode);
355 /* XXX: check error code? Is there any thing I can do? */
356 (void) nilfs_ifile_delete_inode(sbi->s_ifile, inode->i_ino);
357 atomic_dec(&sbi->s_inodes_count);
358}
359
360void nilfs_set_inode_flags(struct inode *inode)
361{
362 unsigned int flags = NILFS_I(inode)->i_flags;
363
364 inode->i_flags &= ~(S_SYNC | S_APPEND | S_IMMUTABLE | S_NOATIME |
365 S_DIRSYNC);
366 if (flags & NILFS_SYNC_FL)
367 inode->i_flags |= S_SYNC;
368 if (flags & NILFS_APPEND_FL)
369 inode->i_flags |= S_APPEND;
370 if (flags & NILFS_IMMUTABLE_FL)
371 inode->i_flags |= S_IMMUTABLE;
372#ifndef NILFS_ATIME_DISABLE
373 if (flags & NILFS_NOATIME_FL)
374#endif
375 inode->i_flags |= S_NOATIME;
376 if (flags & NILFS_DIRSYNC_FL)
377 inode->i_flags |= S_DIRSYNC;
378 mapping_set_gfp_mask(inode->i_mapping,
379 mapping_gfp_mask(inode->i_mapping) & ~__GFP_FS);
380}
381
382int nilfs_read_inode_common(struct inode *inode,
383 struct nilfs_inode *raw_inode)
384{
385 struct nilfs_inode_info *ii = NILFS_I(inode);
386 int err;
387
388 inode->i_mode = le16_to_cpu(raw_inode->i_mode);
389 inode->i_uid = (uid_t)le32_to_cpu(raw_inode->i_uid);
390 inode->i_gid = (gid_t)le32_to_cpu(raw_inode->i_gid);
391 inode->i_nlink = le16_to_cpu(raw_inode->i_links_count);
392 inode->i_size = le64_to_cpu(raw_inode->i_size);
393 inode->i_atime.tv_sec = le64_to_cpu(raw_inode->i_mtime);
394 inode->i_ctime.tv_sec = le64_to_cpu(raw_inode->i_ctime);
395 inode->i_mtime.tv_sec = le64_to_cpu(raw_inode->i_mtime);
396 inode->i_atime.tv_nsec = 0;
397 inode->i_ctime.tv_nsec = 0;
398 inode->i_mtime.tv_nsec = 0;
399 ii->i_dtime = le64_to_cpu(raw_inode->i_dtime);
400 if (inode->i_nlink == 0 && (inode->i_mode == 0 || ii->i_dtime))
401 return -EINVAL; /* this inode is deleted */
402
403 inode->i_blocks = le64_to_cpu(raw_inode->i_blocks);
404 ii->i_flags = le32_to_cpu(raw_inode->i_flags);
405#if 0
406 ii->i_file_acl = le32_to_cpu(raw_inode->i_file_acl);
407 ii->i_dir_acl = S_ISREG(inode->i_mode) ?
408 0 : le32_to_cpu(raw_inode->i_dir_acl);
409#endif
410 ii->i_cno = 0;
411 inode->i_generation = le32_to_cpu(raw_inode->i_generation);
412
413 if (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
414 S_ISLNK(inode->i_mode)) {
415 err = nilfs_bmap_read(ii->i_bmap, raw_inode);
416 if (err < 0)
417 return err;
418 set_bit(NILFS_I_BMAP, &ii->i_state);
419 /* No lock is needed; iget() ensures it. */
420 }
421 return 0;
422}
423
424static int nilfs_read_sketch_inode(struct inode *inode)
425{
426 struct nilfs_sb_info *sbi = NILFS_SB(inode->i_sb);
427 int err = 0;
428
429 if (sbi->s_snapshot_cno) {
430 struct the_nilfs *nilfs = sbi->s_nilfs;
431 struct buffer_head *bh_cp;
432 struct nilfs_checkpoint *raw_cp;
433
434 err = nilfs_cpfile_get_checkpoint(
435 nilfs->ns_cpfile, sbi->s_snapshot_cno, 0, &raw_cp,
436 &bh_cp);
437 if (likely(!err)) {
438 if (!nilfs_checkpoint_sketch(raw_cp))
439 inode->i_size = 0;
440 nilfs_cpfile_put_checkpoint(
441 nilfs->ns_cpfile, sbi->s_snapshot_cno, bh_cp);
442 }
443 inode->i_flags |= S_NOCMTIME;
444 }
445 return err;
446}
447
448static int __nilfs_read_inode(struct super_block *sb, unsigned long ino,
449 struct inode *inode)
450{
451 struct nilfs_sb_info *sbi = NILFS_SB(sb);
452 struct inode *dat = nilfs_dat_inode(sbi->s_nilfs);
453 struct buffer_head *bh;
454 struct nilfs_inode *raw_inode;
455 int err;
456
457 down_read(&NILFS_MDT(dat)->mi_sem); /* XXX */
458 err = nilfs_ifile_get_inode_block(sbi->s_ifile, ino, &bh);
459 if (unlikely(err))
460 goto bad_inode;
461
462 raw_inode = nilfs_ifile_map_inode(sbi->s_ifile, ino, bh);
463
464#ifdef CONFIG_NILFS_FS_POSIX_ACL
465 ii->i_acl = NILFS_ACL_NOT_CACHED;
466 ii->i_default_acl = NILFS_ACL_NOT_CACHED;
467#endif
468 if (nilfs_read_inode_common(inode, raw_inode))
469 goto failed_unmap;
470
471 if (S_ISREG(inode->i_mode)) {
472 inode->i_op = &nilfs_file_inode_operations;
473 inode->i_fop = &nilfs_file_operations;
474 inode->i_mapping->a_ops = &nilfs_aops;
475 if (unlikely(inode->i_ino == NILFS_SKETCH_INO)) {
476 err = nilfs_read_sketch_inode(inode);
477 if (unlikely(err))
478 goto failed_unmap;
479 }
480 } else if (S_ISDIR(inode->i_mode)) {
481 inode->i_op = &nilfs_dir_inode_operations;
482 inode->i_fop = &nilfs_dir_operations;
483 inode->i_mapping->a_ops = &nilfs_aops;
484 } else if (S_ISLNK(inode->i_mode)) {
485 inode->i_op = &nilfs_symlink_inode_operations;
486 inode->i_mapping->a_ops = &nilfs_aops;
487 } else {
488 inode->i_op = &nilfs_special_inode_operations;
489 init_special_inode(
490 inode, inode->i_mode,
491 new_decode_dev(le64_to_cpu(raw_inode->i_device_code)));
492 }
493 nilfs_ifile_unmap_inode(sbi->s_ifile, ino, bh);
494 brelse(bh);
495 up_read(&NILFS_MDT(dat)->mi_sem); /* XXX */
496 nilfs_set_inode_flags(inode);
497 return 0;
498
499 failed_unmap:
500 nilfs_ifile_unmap_inode(sbi->s_ifile, ino, bh);
501 brelse(bh);
502
503 bad_inode:
504 up_read(&NILFS_MDT(dat)->mi_sem); /* XXX */
505 return err;
506}
507
508struct inode *nilfs_iget(struct super_block *sb, unsigned long ino)
509{
510 struct inode *inode;
511 int err;
512
513 inode = iget_locked(sb, ino);
514 if (unlikely(!inode))
515 return ERR_PTR(-ENOMEM);
516 if (!(inode->i_state & I_NEW))
517 return inode;
518
519 err = __nilfs_read_inode(sb, ino, inode);
520 if (unlikely(err)) {
521 iget_failed(inode);
522 return ERR_PTR(err);
523 }
524 unlock_new_inode(inode);
525 return inode;
526}
527
528void nilfs_write_inode_common(struct inode *inode,
529 struct nilfs_inode *raw_inode, int has_bmap)
530{
531 struct nilfs_inode_info *ii = NILFS_I(inode);
532
533 raw_inode->i_mode = cpu_to_le16(inode->i_mode);
534 raw_inode->i_uid = cpu_to_le32(inode->i_uid);
535 raw_inode->i_gid = cpu_to_le32(inode->i_gid);
536 raw_inode->i_links_count = cpu_to_le16(inode->i_nlink);
537 raw_inode->i_size = cpu_to_le64(inode->i_size);
538 raw_inode->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec);
539 raw_inode->i_mtime = cpu_to_le64(inode->i_mtime.tv_sec);
540 raw_inode->i_blocks = cpu_to_le64(inode->i_blocks);
541
542 raw_inode->i_dtime = cpu_to_le64(ii->i_dtime);
543 raw_inode->i_flags = cpu_to_le32(ii->i_flags);
544 raw_inode->i_generation = cpu_to_le32(inode->i_generation);
545
546 if (has_bmap)
547 nilfs_bmap_write(ii->i_bmap, raw_inode);
548 else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
549 raw_inode->i_device_code =
550 cpu_to_le64(new_encode_dev(inode->i_rdev));
551 /* When extending inode, nilfs->ns_inode_size should be checked
552 for substitutions of appended fields */
553}
554
555void nilfs_update_inode(struct inode *inode, struct buffer_head *ibh)
556{
557 ino_t ino = inode->i_ino;
558 struct nilfs_inode_info *ii = NILFS_I(inode);
559 struct super_block *sb = inode->i_sb;
560 struct nilfs_sb_info *sbi = NILFS_SB(sb);
561 struct nilfs_inode *raw_inode;
562
563 raw_inode = nilfs_ifile_map_inode(sbi->s_ifile, ino, ibh);
564
565 /* The buffer is guarded with lock_buffer() by the caller */
566 if (test_and_clear_bit(NILFS_I_NEW, &ii->i_state))
567 memset(raw_inode, 0, NILFS_MDT(sbi->s_ifile)->mi_entry_size);
568 set_bit(NILFS_I_INODE_DIRTY, &ii->i_state);
569
570 nilfs_write_inode_common(inode, raw_inode, 0);
571 /* XXX: call with has_bmap = 0 is a workaround to avoid
572 deadlock of bmap. This delays update of i_bmap to just
573 before writing */
574 nilfs_ifile_unmap_inode(sbi->s_ifile, ino, ibh);
575}
576
577#define NILFS_MAX_TRUNCATE_BLOCKS 16384 /* 64MB for 4KB block */
578
579static void nilfs_truncate_bmap(struct nilfs_inode_info *ii,
580 unsigned long from)
581{
582 unsigned long b;
583 int ret;
584
585 if (!test_bit(NILFS_I_BMAP, &ii->i_state))
586 return;
587 repeat:
588 ret = nilfs_bmap_last_key(ii->i_bmap, &b);
589 if (ret == -ENOENT)
590 return;
591 else if (ret < 0)
592 goto failed;
593
594 if (b < from)
595 return;
596
597 b -= min_t(unsigned long, NILFS_MAX_TRUNCATE_BLOCKS, b - from);
598 ret = nilfs_bmap_truncate(ii->i_bmap, b);
599 nilfs_relax_pressure_in_lock(ii->vfs_inode.i_sb);
600 if (!ret || (ret == -ENOMEM &&
601 nilfs_bmap_truncate(ii->i_bmap, b) == 0))
602 goto repeat;
603
604 failed:
605 if (ret == -EINVAL)
606 nilfs_error(ii->vfs_inode.i_sb, __func__,
607 "bmap is broken (ino=%lu)", ii->vfs_inode.i_ino);
608 else
609 nilfs_warning(ii->vfs_inode.i_sb, __func__,
610 "failed to truncate bmap (ino=%lu, err=%d)",
611 ii->vfs_inode.i_ino, ret);
612}
613
614void nilfs_truncate(struct inode *inode)
615{
616 unsigned long blkoff;
617 unsigned int blocksize;
618 struct nilfs_transaction_info ti;
619 struct super_block *sb = inode->i_sb;
620 struct nilfs_inode_info *ii = NILFS_I(inode);
621 int ret;
622
623 if (!test_bit(NILFS_I_BMAP, &ii->i_state))
624 return;
625 if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
626 return;
627
628 blocksize = sb->s_blocksize;
629 blkoff = (inode->i_size + blocksize - 1) >> sb->s_blocksize_bits;
630 ret = nilfs_transaction_begin(sb, &ti, 0);
631 BUG_ON(ret);
632
633 block_truncate_page(inode->i_mapping, inode->i_size, nilfs_get_block);
634
635 nilfs_truncate_bmap(ii, blkoff);
636
637 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
638 if (IS_SYNC(inode))
639 nilfs_set_transaction_flag(NILFS_TI_SYNC);
640
641 nilfs_set_file_dirty(NILFS_SB(sb), inode, 0);
642 nilfs_transaction_end(sb, 1);
643 /* May construct a logical segment and may fail in sync mode.
644 But truncate has no return value. */
645}
646
647void nilfs_delete_inode(struct inode *inode)
648{
649 struct nilfs_transaction_info ti;
650 struct super_block *sb = inode->i_sb;
651 struct nilfs_inode_info *ii = NILFS_I(inode);
652 int err;
653
654 if (unlikely(is_bad_inode(inode))) {
655 if (inode->i_data.nrpages)
656 truncate_inode_pages(&inode->i_data, 0);
657 clear_inode(inode);
658 return;
659 }
660 err = nilfs_transaction_begin(sb, &ti, 0);
661 BUG_ON(err);
662 if (inode->i_data.nrpages)
663 truncate_inode_pages(&inode->i_data, 0);
664
665 nilfs_truncate_bmap(ii, 0);
666 nilfs_free_inode(inode);
667 /* nilfs_free_inode() marks inode buffer dirty */
668 if (IS_SYNC(inode))
669 nilfs_set_transaction_flag(NILFS_TI_SYNC);
670 nilfs_transaction_end(sb, 1);
671 /* May construct a logical segment and may fail in sync mode.
672 But delete_inode has no return value. */
673}
674
675int nilfs_setattr(struct dentry *dentry, struct iattr *iattr)
676{
677 struct nilfs_transaction_info ti;
678 struct inode *inode = dentry->d_inode;
679 struct super_block *sb = inode->i_sb;
680 int err, err2;
681
682 err = inode_change_ok(inode, iattr);
683 if (err)
684 return err;
685
686 err = nilfs_transaction_begin(sb, &ti, 0);
687 if (unlikely(err))
688 return err;
689 err = inode_setattr(inode, iattr);
690 if (!err && (iattr->ia_valid & ATTR_MODE))
691 err = nilfs_acl_chmod(inode);
692 err2 = nilfs_transaction_end(sb, 1);
693 return err ? : err2;
694}
695
696int nilfs_load_inode_block(struct nilfs_sb_info *sbi, struct inode *inode,
697 struct buffer_head **pbh)
698{
699 struct nilfs_inode_info *ii = NILFS_I(inode);
700 int err;
701
702 spin_lock(&sbi->s_inode_lock);
703 /* Caller of this function MUST lock s_inode_lock */
704 if (ii->i_bh == NULL) {
705 spin_unlock(&sbi->s_inode_lock);
706 err = nilfs_ifile_get_inode_block(sbi->s_ifile, inode->i_ino,
707 pbh);
708 if (unlikely(err))
709 return err;
710 spin_lock(&sbi->s_inode_lock);
711 if (ii->i_bh == NULL)
712 ii->i_bh = *pbh;
713 else {
714 brelse(*pbh);
715 *pbh = ii->i_bh;
716 }
717 } else
718 *pbh = ii->i_bh;
719
720 get_bh(*pbh);
721 spin_unlock(&sbi->s_inode_lock);
722 return 0;
723}
724
725int nilfs_inode_dirty(struct inode *inode)
726{
727 struct nilfs_inode_info *ii = NILFS_I(inode);
728 struct nilfs_sb_info *sbi = NILFS_SB(inode->i_sb);
729 int ret = 0;
730
731 if (!list_empty(&ii->i_dirty)) {
732 spin_lock(&sbi->s_inode_lock);
733 ret = test_bit(NILFS_I_DIRTY, &ii->i_state) ||
734 test_bit(NILFS_I_BUSY, &ii->i_state);
735 spin_unlock(&sbi->s_inode_lock);
736 }
737 return ret;
738}
739
740int nilfs_set_file_dirty(struct nilfs_sb_info *sbi, struct inode *inode,
741 unsigned nr_dirty)
742{
743 struct nilfs_inode_info *ii = NILFS_I(inode);
744
745 atomic_add(nr_dirty, &sbi->s_nilfs->ns_ndirtyblks);
746
747 if (test_and_set_bit(NILFS_I_DIRTY, &ii->i_state) ||
748 unlikely(inode->i_ino == NILFS_SKETCH_INO))
749 return 0;
750
751 spin_lock(&sbi->s_inode_lock);
752 if (!test_bit(NILFS_I_QUEUED, &ii->i_state) &&
753 !test_bit(NILFS_I_BUSY, &ii->i_state)) {
754 /* Because this routine may race with nilfs_dispose_list(),
755 we have to check NILFS_I_QUEUED here, too. */
756 if (list_empty(&ii->i_dirty) && igrab(inode) == NULL) {
757 /* This will happen when somebody is freeing
758 this inode. */
759 nilfs_warning(sbi->s_super, __func__,
760 "cannot get inode (ino=%lu)\n",
761 inode->i_ino);
762 spin_unlock(&sbi->s_inode_lock);
763 return -EINVAL; /* NILFS_I_DIRTY may remain for
764 freeing inode */
765 }
766 list_del(&ii->i_dirty);
767 list_add_tail(&ii->i_dirty, &sbi->s_dirty_files);
768 set_bit(NILFS_I_QUEUED, &ii->i_state);
769 }
770 spin_unlock(&sbi->s_inode_lock);
771 return 0;
772}
773
774int nilfs_mark_inode_dirty(struct inode *inode)
775{
776 struct nilfs_sb_info *sbi = NILFS_SB(inode->i_sb);
777 struct buffer_head *ibh;
778 int err;
779
780 err = nilfs_load_inode_block(sbi, inode, &ibh);
781 if (unlikely(err)) {
782 nilfs_warning(inode->i_sb, __func__,
783 "failed to reget inode block.\n");
784 return err;
785 }
786 lock_buffer(ibh);
787 nilfs_update_inode(inode, ibh);
788 unlock_buffer(ibh);
789 nilfs_mdt_mark_buffer_dirty(ibh);
790 nilfs_mdt_mark_dirty(sbi->s_ifile);
791 brelse(ibh);
792 return 0;
793}
794
795/**
796 * nilfs_dirty_inode - reflect changes on given inode to an inode block.
797 * @inode: inode of the file to be registered.
798 *
799 * nilfs_dirty_inode() loads a inode block containing the specified
800 * @inode and copies data from a nilfs_inode to a corresponding inode
801 * entry in the inode block. This operation is excluded from the segment
802 * construction. This function can be called both as a single operation
803 * and as a part of indivisible file operations.
804 */
805void nilfs_dirty_inode(struct inode *inode)
806{
807 struct nilfs_transaction_info ti;
808
809 if (is_bad_inode(inode)) {
810 nilfs_warning(inode->i_sb, __func__,
811 "tried to mark bad_inode dirty. ignored.\n");
812 dump_stack();
813 return;
814 }
815 nilfs_transaction_begin(inode->i_sb, &ti, 0);
816 if (likely(inode->i_ino != NILFS_SKETCH_INO))
817 nilfs_mark_inode_dirty(inode);
818 nilfs_transaction_end(inode->i_sb, 1); /* never fails */
819}
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-22 16:12:21 -0500