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-rw-r--r--fs/nilfs2/inode.c785
1 files changed, 785 insertions, 0 deletions
diff --git a/fs/nilfs2/inode.c b/fs/nilfs2/inode.c
new file mode 100644
index 000000000000..49ab4a49bb4f
--- /dev/null
+++ b/fs/nilfs2/inode.c
@@ -0,0 +1,785 @@
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 <linux/uio.h>
28#include "nilfs.h"
29#include "segment.h"
30#include "page.h"
31#include "mdt.h"
32#include "cpfile.h"
33#include "ifile.h"
34
35
36/**
37 * nilfs_get_block() - get a file block on the filesystem (callback function)
38 * @inode - inode struct of the target file
39 * @blkoff - file block number
40 * @bh_result - buffer head to be mapped on
41 * @create - indicate whether allocating the block or not when it has not
42 * been allocated yet.
43 *
44 * This function does not issue actual read request of the specified data
45 * block. It is done by VFS.
46 * Bulk read for direct-io is not supported yet. (should be supported)
47 */
48int nilfs_get_block(struct inode *inode, sector_t blkoff,
49 struct buffer_head *bh_result, int create)
50{
51 struct nilfs_inode_info *ii = NILFS_I(inode);
52 unsigned long blknum = 0;
53 int err = 0, ret;
54 struct inode *dat = nilfs_dat_inode(NILFS_I_NILFS(inode));
55
56 /* This exclusion control is a workaround; should be revised */
57 down_read(&NILFS_MDT(dat)->mi_sem); /* XXX */
58 ret = nilfs_bmap_lookup(ii->i_bmap, (unsigned long)blkoff, &blknum);
59 up_read(&NILFS_MDT(dat)->mi_sem); /* XXX */
60 if (ret == 0) { /* found */
61 map_bh(bh_result, inode->i_sb, blknum);
62 goto out;
63 }
64 /* data block was not found */
65 if (ret == -ENOENT && create) {
66 struct nilfs_transaction_info ti;
67
68 bh_result->b_blocknr = 0;
69 err = nilfs_transaction_begin(inode->i_sb, &ti, 1);
70 if (unlikely(err))
71 goto out;
72 err = nilfs_bmap_insert(ii->i_bmap, (unsigned long)blkoff,
73 (unsigned long)bh_result);
74 if (unlikely(err != 0)) {
75 if (err == -EEXIST) {
76 /*
77 * The get_block() function could be called
78 * from multiple callers for an inode.
79 * However, the page having this block must
80 * be locked in this case.
81 */
82 printk(KERN_WARNING
83 "nilfs_get_block: a race condition "
84 "while inserting a data block. "
85 "(inode number=%lu, file block "
86 "offset=%llu)\n",
87 inode->i_ino,
88 (unsigned long long)blkoff);
89 err = 0;
90 } else if (err == -EINVAL) {
91 nilfs_error(inode->i_sb, __func__,
92 "broken bmap (inode=%lu)\n",
93 inode->i_ino);
94 err = -EIO;
95 }
96 nilfs_transaction_abort(inode->i_sb);
97 goto out;
98 }
99 nilfs_transaction_commit(inode->i_sb); /* never fails */
100 /* Error handling should be detailed */
101 set_buffer_new(bh_result);
102 map_bh(bh_result, inode->i_sb, 0); /* dbn must be changed
103 to proper value */
104 } else if (ret == -ENOENT) {
105 /* not found is not error (e.g. hole); must return without
106 the mapped state flag. */
107 ;
108 } else {
109 err = ret;
110 }
111
112 out:
113 return err;
114}
115
116/**
117 * nilfs_readpage() - implement readpage() method of nilfs_aops {}
118 * address_space_operations.
119 * @file - file struct of the file to be read
120 * @page - the page to be read
121 */
122static int nilfs_readpage(struct file *file, struct page *page)
123{
124 return mpage_readpage(page, nilfs_get_block);
125}
126
127/**
128 * nilfs_readpages() - implement readpages() method of nilfs_aops {}
129 * address_space_operations.
130 * @file - file struct of the file to be read
131 * @mapping - address_space struct used for reading multiple pages
132 * @pages - the pages to be read
133 * @nr_pages - number of pages to be read
134 */
135static int nilfs_readpages(struct file *file, struct address_space *mapping,
136 struct list_head *pages, unsigned nr_pages)
137{
138 return mpage_readpages(mapping, pages, nr_pages, nilfs_get_block);
139}
140
141static int nilfs_writepages(struct address_space *mapping,
142 struct writeback_control *wbc)
143{
144 struct inode *inode = mapping->host;
145 int err = 0;
146
147 if (wbc->sync_mode == WB_SYNC_ALL)
148 err = nilfs_construct_dsync_segment(inode->i_sb, inode,
149 wbc->range_start,
150 wbc->range_end);
151 return err;
152}
153
154static int nilfs_writepage(struct page *page, struct writeback_control *wbc)
155{
156 struct inode *inode = page->mapping->host;
157 int err;
158
159 redirty_page_for_writepage(wbc, page);
160 unlock_page(page);
161
162 if (wbc->sync_mode == WB_SYNC_ALL) {
163 err = nilfs_construct_segment(inode->i_sb);
164 if (unlikely(err))
165 return err;
166 } else if (wbc->for_reclaim)
167 nilfs_flush_segment(inode->i_sb, inode->i_ino);
168
169 return 0;
170}
171
172static int nilfs_set_page_dirty(struct page *page)
173{
174 int ret = __set_page_dirty_buffers(page);
175
176 if (ret) {
177 struct inode *inode = page->mapping->host;
178 struct nilfs_sb_info *sbi = NILFS_SB(inode->i_sb);
179 unsigned nr_dirty = 1 << (PAGE_SHIFT - inode->i_blkbits);
180
181 nilfs_set_file_dirty(sbi, inode, nr_dirty);
182 }
183 return ret;
184}
185
186static int nilfs_write_begin(struct file *file, struct address_space *mapping,
187 loff_t pos, unsigned len, unsigned flags,
188 struct page **pagep, void **fsdata)
189
190{
191 struct inode *inode = mapping->host;
192 int err = nilfs_transaction_begin(inode->i_sb, NULL, 1);
193
194 if (unlikely(err))
195 return err;
196
197 *pagep = NULL;
198 err = block_write_begin(file, mapping, pos, len, flags, pagep,
199 fsdata, nilfs_get_block);
200 if (unlikely(err))
201 nilfs_transaction_abort(inode->i_sb);
202 return err;
203}
204
205static int nilfs_write_end(struct file *file, struct address_space *mapping,
206 loff_t pos, unsigned len, unsigned copied,
207 struct page *page, void *fsdata)
208{
209 struct inode *inode = mapping->host;
210 unsigned start = pos & (PAGE_CACHE_SIZE - 1);
211 unsigned nr_dirty;
212 int err;
213
214 nr_dirty = nilfs_page_count_clean_buffers(page, start,
215 start + copied);
216 copied = generic_write_end(file, mapping, pos, len, copied, page,
217 fsdata);
218 nilfs_set_file_dirty(NILFS_SB(inode->i_sb), inode, nr_dirty);
219 err = nilfs_transaction_commit(inode->i_sb);
220 return err ? : copied;
221}
222
223static ssize_t
224nilfs_direct_IO(int rw, struct kiocb *iocb, const struct iovec *iov,
225 loff_t offset, unsigned long nr_segs)
226{
227 struct file *file = iocb->ki_filp;
228 struct inode *inode = file->f_mapping->host;
229 ssize_t size;
230
231 if (rw == WRITE)
232 return 0;
233
234 /* Needs synchronization with the cleaner */
235 size = blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov,
236 offset, nr_segs, nilfs_get_block, NULL);
237 return size;
238}
239
240struct address_space_operations nilfs_aops = {
241 .writepage = nilfs_writepage,
242 .readpage = nilfs_readpage,
243 /* .sync_page = nilfs_sync_page, */
244 .writepages = nilfs_writepages,
245 .set_page_dirty = nilfs_set_page_dirty,
246 .readpages = nilfs_readpages,
247 .write_begin = nilfs_write_begin,
248 .write_end = nilfs_write_end,
249 /* .releasepage = nilfs_releasepage, */
250 .invalidatepage = block_invalidatepage,
251 .direct_IO = nilfs_direct_IO,
252};
253
254struct inode *nilfs_new_inode(struct inode *dir, int mode)
255{
256 struct super_block *sb = dir->i_sb;
257 struct nilfs_sb_info *sbi = NILFS_SB(sb);
258 struct inode *inode;
259 struct nilfs_inode_info *ii;
260 int err = -ENOMEM;
261 ino_t ino;
262
263 inode = new_inode(sb);
264 if (unlikely(!inode))
265 goto failed;
266
267 mapping_set_gfp_mask(inode->i_mapping,
268 mapping_gfp_mask(inode->i_mapping) & ~__GFP_FS);
269
270 ii = NILFS_I(inode);
271 ii->i_state = 1 << NILFS_I_NEW;
272
273 err = nilfs_ifile_create_inode(sbi->s_ifile, &ino, &ii->i_bh);
274 if (unlikely(err))
275 goto failed_ifile_create_inode;
276 /* reference count of i_bh inherits from nilfs_mdt_read_block() */
277
278 atomic_inc(&sbi->s_inodes_count);
279
280 inode->i_uid = current_fsuid();
281 if (dir->i_mode & S_ISGID) {
282 inode->i_gid = dir->i_gid;
283 if (S_ISDIR(mode))
284 mode |= S_ISGID;
285 } else
286 inode->i_gid = current_fsgid();
287
288 inode->i_mode = mode;
289 inode->i_ino = ino;
290 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
291
292 if (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode)) {
293 err = nilfs_bmap_read(ii->i_bmap, NULL);
294 if (err < 0)
295 goto failed_bmap;
296
297 set_bit(NILFS_I_BMAP, &ii->i_state);
298 /* No lock is needed; iget() ensures it. */
299 }
300
301 ii->i_flags = NILFS_I(dir)->i_flags;
302 if (S_ISLNK(mode))
303 ii->i_flags &= ~(NILFS_IMMUTABLE_FL | NILFS_APPEND_FL);
304 if (!S_ISDIR(mode))
305 ii->i_flags &= ~NILFS_DIRSYNC_FL;
306
307 /* ii->i_file_acl = 0; */
308 /* ii->i_dir_acl = 0; */
309 ii->i_dir_start_lookup = 0;
310#ifdef CONFIG_NILFS_FS_POSIX_ACL
311 ii->i_acl = NULL;
312 ii->i_default_acl = NULL;
313#endif
314 ii->i_cno = 0;
315 nilfs_set_inode_flags(inode);
316 spin_lock(&sbi->s_next_gen_lock);
317 inode->i_generation = sbi->s_next_generation++;
318 spin_unlock(&sbi->s_next_gen_lock);
319 insert_inode_hash(inode);
320
321 err = nilfs_init_acl(inode, dir);
322 if (unlikely(err))
323 goto failed_acl; /* never occur. When supporting
324 nilfs_init_acl(), proper cancellation of
325 above jobs should be considered */
326
327 mark_inode_dirty(inode);
328 return inode;
329
330 failed_acl:
331 failed_bmap:
332 inode->i_nlink = 0;
333 iput(inode); /* raw_inode will be deleted through
334 generic_delete_inode() */
335 goto failed;
336
337 failed_ifile_create_inode:
338 make_bad_inode(inode);
339 iput(inode); /* if i_nlink == 1, generic_forget_inode() will be
340 called */
341 failed:
342 return ERR_PTR(err);
343}
344
345void nilfs_free_inode(struct inode *inode)
346{
347 struct super_block *sb = inode->i_sb;
348 struct nilfs_sb_info *sbi = NILFS_SB(sb);
349
350 clear_inode(inode);
351 /* XXX: check error code? Is there any thing I can do? */
352 (void) nilfs_ifile_delete_inode(sbi->s_ifile, inode->i_ino);
353 atomic_dec(&sbi->s_inodes_count);
354}
355
356void nilfs_set_inode_flags(struct inode *inode)
357{
358 unsigned int flags = NILFS_I(inode)->i_flags;
359
360 inode->i_flags &= ~(S_SYNC | S_APPEND | S_IMMUTABLE | S_NOATIME |
361 S_DIRSYNC);
362 if (flags & NILFS_SYNC_FL)
363 inode->i_flags |= S_SYNC;
364 if (flags & NILFS_APPEND_FL)
365 inode->i_flags |= S_APPEND;
366 if (flags & NILFS_IMMUTABLE_FL)
367 inode->i_flags |= S_IMMUTABLE;
368#ifndef NILFS_ATIME_DISABLE
369 if (flags & NILFS_NOATIME_FL)
370#endif
371 inode->i_flags |= S_NOATIME;
372 if (flags & NILFS_DIRSYNC_FL)
373 inode->i_flags |= S_DIRSYNC;
374 mapping_set_gfp_mask(inode->i_mapping,
375 mapping_gfp_mask(inode->i_mapping) & ~__GFP_FS);
376}
377
378int nilfs_read_inode_common(struct inode *inode,
379 struct nilfs_inode *raw_inode)
380{
381 struct nilfs_inode_info *ii = NILFS_I(inode);
382 int err;
383
384 inode->i_mode = le16_to_cpu(raw_inode->i_mode);
385 inode->i_uid = (uid_t)le32_to_cpu(raw_inode->i_uid);
386 inode->i_gid = (gid_t)le32_to_cpu(raw_inode->i_gid);
387 inode->i_nlink = le16_to_cpu(raw_inode->i_links_count);
388 inode->i_size = le64_to_cpu(raw_inode->i_size);
389 inode->i_atime.tv_sec = le64_to_cpu(raw_inode->i_mtime);
390 inode->i_ctime.tv_sec = le64_to_cpu(raw_inode->i_ctime);
391 inode->i_mtime.tv_sec = le64_to_cpu(raw_inode->i_mtime);
392 inode->i_atime.tv_nsec = le32_to_cpu(raw_inode->i_mtime_nsec);
393 inode->i_ctime.tv_nsec = le32_to_cpu(raw_inode->i_ctime_nsec);
394 inode->i_mtime.tv_nsec = le32_to_cpu(raw_inode->i_mtime_nsec);
395 if (inode->i_nlink == 0 && inode->i_mode == 0)
396 return -EINVAL; /* this inode is deleted */
397
398 inode->i_blocks = le64_to_cpu(raw_inode->i_blocks);
399 ii->i_flags = le32_to_cpu(raw_inode->i_flags);
400#if 0
401 ii->i_file_acl = le32_to_cpu(raw_inode->i_file_acl);
402 ii->i_dir_acl = S_ISREG(inode->i_mode) ?
403 0 : le32_to_cpu(raw_inode->i_dir_acl);
404#endif
405 ii->i_cno = 0;
406 inode->i_generation = le32_to_cpu(raw_inode->i_generation);
407
408 if (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
409 S_ISLNK(inode->i_mode)) {
410 err = nilfs_bmap_read(ii->i_bmap, raw_inode);
411 if (err < 0)
412 return err;
413 set_bit(NILFS_I_BMAP, &ii->i_state);
414 /* No lock is needed; iget() ensures it. */
415 }
416 return 0;
417}
418
419static int __nilfs_read_inode(struct super_block *sb, unsigned long ino,
420 struct inode *inode)
421{
422 struct nilfs_sb_info *sbi = NILFS_SB(sb);
423 struct inode *dat = nilfs_dat_inode(sbi->s_nilfs);
424 struct buffer_head *bh;
425 struct nilfs_inode *raw_inode;
426 int err;
427
428 down_read(&NILFS_MDT(dat)->mi_sem); /* XXX */
429 err = nilfs_ifile_get_inode_block(sbi->s_ifile, ino, &bh);
430 if (unlikely(err))
431 goto bad_inode;
432
433 raw_inode = nilfs_ifile_map_inode(sbi->s_ifile, ino, bh);
434
435#ifdef CONFIG_NILFS_FS_POSIX_ACL
436 ii->i_acl = NILFS_ACL_NOT_CACHED;
437 ii->i_default_acl = NILFS_ACL_NOT_CACHED;
438#endif
439 if (nilfs_read_inode_common(inode, raw_inode))
440 goto failed_unmap;
441
442 if (S_ISREG(inode->i_mode)) {
443 inode->i_op = &nilfs_file_inode_operations;
444 inode->i_fop = &nilfs_file_operations;
445 inode->i_mapping->a_ops = &nilfs_aops;
446 } else if (S_ISDIR(inode->i_mode)) {
447 inode->i_op = &nilfs_dir_inode_operations;
448 inode->i_fop = &nilfs_dir_operations;
449 inode->i_mapping->a_ops = &nilfs_aops;
450 } else if (S_ISLNK(inode->i_mode)) {
451 inode->i_op = &nilfs_symlink_inode_operations;
452 inode->i_mapping->a_ops = &nilfs_aops;
453 } else {
454 inode->i_op = &nilfs_special_inode_operations;
455 init_special_inode(
456 inode, inode->i_mode,
457 new_decode_dev(le64_to_cpu(raw_inode->i_device_code)));
458 }
459 nilfs_ifile_unmap_inode(sbi->s_ifile, ino, bh);
460 brelse(bh);
461 up_read(&NILFS_MDT(dat)->mi_sem); /* XXX */
462 nilfs_set_inode_flags(inode);
463 return 0;
464
465 failed_unmap:
466 nilfs_ifile_unmap_inode(sbi->s_ifile, ino, bh);
467 brelse(bh);
468
469 bad_inode:
470 up_read(&NILFS_MDT(dat)->mi_sem); /* XXX */
471 return err;
472}
473
474struct inode *nilfs_iget(struct super_block *sb, unsigned long ino)
475{
476 struct inode *inode;
477 int err;
478
479 inode = iget_locked(sb, ino);
480 if (unlikely(!inode))
481 return ERR_PTR(-ENOMEM);
482 if (!(inode->i_state & I_NEW))
483 return inode;
484
485 err = __nilfs_read_inode(sb, ino, inode);
486 if (unlikely(err)) {
487 iget_failed(inode);
488 return ERR_PTR(err);
489 }
490 unlock_new_inode(inode);
491 return inode;
492}
493
494void nilfs_write_inode_common(struct inode *inode,
495 struct nilfs_inode *raw_inode, int has_bmap)
496{
497 struct nilfs_inode_info *ii = NILFS_I(inode);
498
499 raw_inode->i_mode = cpu_to_le16(inode->i_mode);
500 raw_inode->i_uid = cpu_to_le32(inode->i_uid);
501 raw_inode->i_gid = cpu_to_le32(inode->i_gid);
502 raw_inode->i_links_count = cpu_to_le16(inode->i_nlink);
503 raw_inode->i_size = cpu_to_le64(inode->i_size);
504 raw_inode->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec);
505 raw_inode->i_mtime = cpu_to_le64(inode->i_mtime.tv_sec);
506 raw_inode->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
507 raw_inode->i_mtime_nsec = cpu_to_le32(inode->i_mtime.tv_nsec);
508 raw_inode->i_blocks = cpu_to_le64(inode->i_blocks);
509
510 raw_inode->i_flags = cpu_to_le32(ii->i_flags);
511 raw_inode->i_generation = cpu_to_le32(inode->i_generation);
512
513 if (has_bmap)
514 nilfs_bmap_write(ii->i_bmap, raw_inode);
515 else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
516 raw_inode->i_device_code =
517 cpu_to_le64(new_encode_dev(inode->i_rdev));
518 /* When extending inode, nilfs->ns_inode_size should be checked
519 for substitutions of appended fields */
520}
521
522void nilfs_update_inode(struct inode *inode, struct buffer_head *ibh)
523{
524 ino_t ino = inode->i_ino;
525 struct nilfs_inode_info *ii = NILFS_I(inode);
526 struct super_block *sb = inode->i_sb;
527 struct nilfs_sb_info *sbi = NILFS_SB(sb);
528 struct nilfs_inode *raw_inode;
529
530 raw_inode = nilfs_ifile_map_inode(sbi->s_ifile, ino, ibh);
531
532 /* The buffer is guarded with lock_buffer() by the caller */
533 if (test_and_clear_bit(NILFS_I_NEW, &ii->i_state))
534 memset(raw_inode, 0, NILFS_MDT(sbi->s_ifile)->mi_entry_size);
535 set_bit(NILFS_I_INODE_DIRTY, &ii->i_state);
536
537 nilfs_write_inode_common(inode, raw_inode, 0);
538 /* XXX: call with has_bmap = 0 is a workaround to avoid
539 deadlock of bmap. This delays update of i_bmap to just
540 before writing */
541 nilfs_ifile_unmap_inode(sbi->s_ifile, ino, ibh);
542}
543
544#define NILFS_MAX_TRUNCATE_BLOCKS 16384 /* 64MB for 4KB block */
545
546static void nilfs_truncate_bmap(struct nilfs_inode_info *ii,
547 unsigned long from)
548{
549 unsigned long b;
550 int ret;
551
552 if (!test_bit(NILFS_I_BMAP, &ii->i_state))
553 return;
554 repeat:
555 ret = nilfs_bmap_last_key(ii->i_bmap, &b);
556 if (ret == -ENOENT)
557 return;
558 else if (ret < 0)
559 goto failed;
560
561 if (b < from)
562 return;
563
564 b -= min_t(unsigned long, NILFS_MAX_TRUNCATE_BLOCKS, b - from);
565 ret = nilfs_bmap_truncate(ii->i_bmap, b);
566 nilfs_relax_pressure_in_lock(ii->vfs_inode.i_sb);
567 if (!ret || (ret == -ENOMEM &&
568 nilfs_bmap_truncate(ii->i_bmap, b) == 0))
569 goto repeat;
570
571 failed:
572 if (ret == -EINVAL)
573 nilfs_error(ii->vfs_inode.i_sb, __func__,
574 "bmap is broken (ino=%lu)", ii->vfs_inode.i_ino);
575 else
576 nilfs_warning(ii->vfs_inode.i_sb, __func__,
577 "failed to truncate bmap (ino=%lu, err=%d)",
578 ii->vfs_inode.i_ino, ret);
579}
580
581void nilfs_truncate(struct inode *inode)
582{
583 unsigned long blkoff;
584 unsigned int blocksize;
585 struct nilfs_transaction_info ti;
586 struct super_block *sb = inode->i_sb;
587 struct nilfs_inode_info *ii = NILFS_I(inode);
588
589 if (!test_bit(NILFS_I_BMAP, &ii->i_state))
590 return;
591 if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
592 return;
593
594 blocksize = sb->s_blocksize;
595 blkoff = (inode->i_size + blocksize - 1) >> sb->s_blocksize_bits;
596 nilfs_transaction_begin(sb, &ti, 0); /* never fails */
597
598 block_truncate_page(inode->i_mapping, inode->i_size, nilfs_get_block);
599
600 nilfs_truncate_bmap(ii, blkoff);
601
602 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
603 if (IS_SYNC(inode))
604 nilfs_set_transaction_flag(NILFS_TI_SYNC);
605
606 nilfs_set_file_dirty(NILFS_SB(sb), inode, 0);
607 nilfs_transaction_commit(sb);
608 /* May construct a logical segment and may fail in sync mode.
609 But truncate has no return value. */
610}
611
612void nilfs_delete_inode(struct inode *inode)
613{
614 struct nilfs_transaction_info ti;
615 struct super_block *sb = inode->i_sb;
616 struct nilfs_inode_info *ii = NILFS_I(inode);
617
618 if (unlikely(is_bad_inode(inode))) {
619 if (inode->i_data.nrpages)
620 truncate_inode_pages(&inode->i_data, 0);
621 clear_inode(inode);
622 return;
623 }
624 nilfs_transaction_begin(sb, &ti, 0); /* never fails */
625
626 if (inode->i_data.nrpages)
627 truncate_inode_pages(&inode->i_data, 0);
628
629 nilfs_truncate_bmap(ii, 0);
630 nilfs_free_inode(inode);
631 /* nilfs_free_inode() marks inode buffer dirty */
632 if (IS_SYNC(inode))
633 nilfs_set_transaction_flag(NILFS_TI_SYNC);
634 nilfs_transaction_commit(sb);
635 /* May construct a logical segment and may fail in sync mode.
636 But delete_inode has no return value. */
637}
638
639int nilfs_setattr(struct dentry *dentry, struct iattr *iattr)
640{
641 struct nilfs_transaction_info ti;
642 struct inode *inode = dentry->d_inode;
643 struct super_block *sb = inode->i_sb;
644 int err;
645
646 err = inode_change_ok(inode, iattr);
647 if (err)
648 return err;
649
650 err = nilfs_transaction_begin(sb, &ti, 0);
651 if (unlikely(err))
652 return err;
653 err = inode_setattr(inode, iattr);
654 if (!err && (iattr->ia_valid & ATTR_MODE))
655 err = nilfs_acl_chmod(inode);
656 if (likely(!err))
657 err = nilfs_transaction_commit(sb);
658 else
659 nilfs_transaction_abort(sb);
660
661 return err;
662}
663
664int nilfs_load_inode_block(struct nilfs_sb_info *sbi, struct inode *inode,
665 struct buffer_head **pbh)
666{
667 struct nilfs_inode_info *ii = NILFS_I(inode);
668 int err;
669
670 spin_lock(&sbi->s_inode_lock);
671 /* Caller of this function MUST lock s_inode_lock */
672 if (ii->i_bh == NULL) {
673 spin_unlock(&sbi->s_inode_lock);
674 err = nilfs_ifile_get_inode_block(sbi->s_ifile, inode->i_ino,
675 pbh);
676 if (unlikely(err))
677 return err;
678 spin_lock(&sbi->s_inode_lock);
679 if (ii->i_bh == NULL)
680 ii->i_bh = *pbh;
681 else {
682 brelse(*pbh);
683 *pbh = ii->i_bh;
684 }
685 } else
686 *pbh = ii->i_bh;
687
688 get_bh(*pbh);
689 spin_unlock(&sbi->s_inode_lock);
690 return 0;
691}
692
693int nilfs_inode_dirty(struct inode *inode)
694{
695 struct nilfs_inode_info *ii = NILFS_I(inode);
696 struct nilfs_sb_info *sbi = NILFS_SB(inode->i_sb);
697 int ret = 0;
698
699 if (!list_empty(&ii->i_dirty)) {
700 spin_lock(&sbi->s_inode_lock);
701 ret = test_bit(NILFS_I_DIRTY, &ii->i_state) ||
702 test_bit(NILFS_I_BUSY, &ii->i_state);
703 spin_unlock(&sbi->s_inode_lock);
704 }
705 return ret;
706}
707
708int nilfs_set_file_dirty(struct nilfs_sb_info *sbi, struct inode *inode,
709 unsigned nr_dirty)
710{
711 struct nilfs_inode_info *ii = NILFS_I(inode);
712
713 atomic_add(nr_dirty, &sbi->s_nilfs->ns_ndirtyblks);
714
715 if (test_and_set_bit(NILFS_I_DIRTY, &ii->i_state))
716 return 0;
717
718 spin_lock(&sbi->s_inode_lock);
719 if (!test_bit(NILFS_I_QUEUED, &ii->i_state) &&
720 !test_bit(NILFS_I_BUSY, &ii->i_state)) {
721 /* Because this routine may race with nilfs_dispose_list(),
722 we have to check NILFS_I_QUEUED here, too. */
723 if (list_empty(&ii->i_dirty) && igrab(inode) == NULL) {
724 /* This will happen when somebody is freeing
725 this inode. */
726 nilfs_warning(sbi->s_super, __func__,
727 "cannot get inode (ino=%lu)\n",
728 inode->i_ino);
729 spin_unlock(&sbi->s_inode_lock);
730 return -EINVAL; /* NILFS_I_DIRTY may remain for
731 freeing inode */
732 }
733 list_del(&ii->i_dirty);
734 list_add_tail(&ii->i_dirty, &sbi->s_dirty_files);
735 set_bit(NILFS_I_QUEUED, &ii->i_state);
736 }
737 spin_unlock(&sbi->s_inode_lock);
738 return 0;
739}
740
741int nilfs_mark_inode_dirty(struct inode *inode)
742{
743 struct nilfs_sb_info *sbi = NILFS_SB(inode->i_sb);
744 struct buffer_head *ibh;
745 int err;
746
747 err = nilfs_load_inode_block(sbi, inode, &ibh);
748 if (unlikely(err)) {
749 nilfs_warning(inode->i_sb, __func__,
750 "failed to reget inode block.\n");
751 return err;
752 }
753 lock_buffer(ibh);
754 nilfs_update_inode(inode, ibh);
755 unlock_buffer(ibh);
756 nilfs_mdt_mark_buffer_dirty(ibh);
757 nilfs_mdt_mark_dirty(sbi->s_ifile);
758 brelse(ibh);
759 return 0;
760}
761
762/**
763 * nilfs_dirty_inode - reflect changes on given inode to an inode block.
764 * @inode: inode of the file to be registered.
765 *
766 * nilfs_dirty_inode() loads a inode block containing the specified
767 * @inode and copies data from a nilfs_inode to a corresponding inode
768 * entry in the inode block. This operation is excluded from the segment
769 * construction. This function can be called both as a single operation
770 * and as a part of indivisible file operations.
771 */
772void nilfs_dirty_inode(struct inode *inode)
773{
774 struct nilfs_transaction_info ti;
775
776 if (is_bad_inode(inode)) {
777 nilfs_warning(inode->i_sb, __func__,
778 "tried to mark bad_inode dirty. ignored.\n");
779 dump_stack();
780 return;
781 }
782 nilfs_transaction_begin(inode->i_sb, &ti, 0);
783 nilfs_mark_inode_dirty(inode);
784 nilfs_transaction_commit(inode->i_sb); /* never fails */
785}
generated by cgit v1.2.2 (git 2.25.0) at 2025-01-27 02:59:27 -0500