nilfs2: see state of root dentry for mount check of snapshots
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / fs / nilfs2 / inode.c
blob71d4bc8464e09b793b6c4eb23b97ff09ee093002
1 /*
2 * inode.c - NILFS inode operations.
4 * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation.
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.
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.
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
20 * Written by Ryusuke Konishi <ryusuke@osrg.net>
24 #include <linux/buffer_head.h>
25 #include <linux/gfp.h>
26 #include <linux/mpage.h>
27 #include <linux/writeback.h>
28 #include <linux/uio.h>
29 #include "nilfs.h"
30 #include "btnode.h"
31 #include "segment.h"
32 #include "page.h"
33 #include "mdt.h"
34 #include "cpfile.h"
35 #include "ifile.h"
37 struct nilfs_iget_args {
38 u64 ino;
39 __u64 cno;
40 struct nilfs_root *root;
41 int for_gc;
44 /**
45 * nilfs_get_block() - get a file block on the filesystem (callback function)
46 * @inode - inode struct of the target file
47 * @blkoff - file block number
48 * @bh_result - buffer head to be mapped on
49 * @create - indicate whether allocating the block or not when it has not
50 * been allocated yet.
52 * This function does not issue actual read request of the specified data
53 * block. It is done by VFS.
55 int nilfs_get_block(struct inode *inode, sector_t blkoff,
56 struct buffer_head *bh_result, int create)
58 struct nilfs_inode_info *ii = NILFS_I(inode);
59 __u64 blknum = 0;
60 int err = 0, ret;
61 struct inode *dat = nilfs_dat_inode(NILFS_I_NILFS(inode));
62 unsigned maxblocks = bh_result->b_size >> inode->i_blkbits;
64 down_read(&NILFS_MDT(dat)->mi_sem);
65 ret = nilfs_bmap_lookup_contig(ii->i_bmap, blkoff, &blknum, maxblocks);
66 up_read(&NILFS_MDT(dat)->mi_sem);
67 if (ret >= 0) { /* found */
68 map_bh(bh_result, inode->i_sb, blknum);
69 if (ret > 0)
70 bh_result->b_size = (ret << inode->i_blkbits);
71 goto out;
73 /* data block was not found */
74 if (ret == -ENOENT && create) {
75 struct nilfs_transaction_info ti;
77 bh_result->b_blocknr = 0;
78 err = nilfs_transaction_begin(inode->i_sb, &ti, 1);
79 if (unlikely(err))
80 goto out;
81 err = nilfs_bmap_insert(ii->i_bmap, (unsigned long)blkoff,
82 (unsigned long)bh_result);
83 if (unlikely(err != 0)) {
84 if (err == -EEXIST) {
86 * The get_block() function could be called
87 * from multiple callers for an inode.
88 * However, the page having this block must
89 * be locked in this case.
91 printk(KERN_WARNING
92 "nilfs_get_block: a race condition "
93 "while inserting a data block. "
94 "(inode number=%lu, file block "
95 "offset=%llu)\n",
96 inode->i_ino,
97 (unsigned long long)blkoff);
98 err = 0;
99 } else if (err == -EINVAL) {
100 nilfs_error(inode->i_sb, __func__,
101 "broken bmap (inode=%lu)\n",
102 inode->i_ino);
103 err = -EIO;
105 nilfs_transaction_abort(inode->i_sb);
106 goto out;
108 nilfs_mark_inode_dirty(inode);
109 nilfs_transaction_commit(inode->i_sb); /* never fails */
110 /* Error handling should be detailed */
111 set_buffer_new(bh_result);
112 map_bh(bh_result, inode->i_sb, 0); /* dbn must be changed
113 to proper value */
114 } else if (ret == -ENOENT) {
115 /* not found is not error (e.g. hole); must return without
116 the mapped state flag. */
118 } else {
119 err = ret;
122 out:
123 return err;
127 * nilfs_readpage() - implement readpage() method of nilfs_aops {}
128 * address_space_operations.
129 * @file - file struct of the file to be read
130 * @page - the page to be read
132 static int nilfs_readpage(struct file *file, struct page *page)
134 return mpage_readpage(page, nilfs_get_block);
138 * nilfs_readpages() - implement readpages() method of nilfs_aops {}
139 * address_space_operations.
140 * @file - file struct of the file to be read
141 * @mapping - address_space struct used for reading multiple pages
142 * @pages - the pages to be read
143 * @nr_pages - number of pages to be read
145 static int nilfs_readpages(struct file *file, struct address_space *mapping,
146 struct list_head *pages, unsigned nr_pages)
148 return mpage_readpages(mapping, pages, nr_pages, nilfs_get_block);
151 static int nilfs_writepages(struct address_space *mapping,
152 struct writeback_control *wbc)
154 struct inode *inode = mapping->host;
155 int err = 0;
157 if (wbc->sync_mode == WB_SYNC_ALL)
158 err = nilfs_construct_dsync_segment(inode->i_sb, inode,
159 wbc->range_start,
160 wbc->range_end);
161 return err;
164 static int nilfs_writepage(struct page *page, struct writeback_control *wbc)
166 struct inode *inode = page->mapping->host;
167 int err;
169 redirty_page_for_writepage(wbc, page);
170 unlock_page(page);
172 if (wbc->sync_mode == WB_SYNC_ALL) {
173 err = nilfs_construct_segment(inode->i_sb);
174 if (unlikely(err))
175 return err;
176 } else if (wbc->for_reclaim)
177 nilfs_flush_segment(inode->i_sb, inode->i_ino);
179 return 0;
182 static int nilfs_set_page_dirty(struct page *page)
184 int ret = __set_page_dirty_buffers(page);
186 if (ret) {
187 struct inode *inode = page->mapping->host;
188 struct nilfs_sb_info *sbi = NILFS_SB(inode->i_sb);
189 unsigned nr_dirty = 1 << (PAGE_SHIFT - inode->i_blkbits);
191 nilfs_set_file_dirty(sbi, inode, nr_dirty);
193 return ret;
196 static int nilfs_write_begin(struct file *file, struct address_space *mapping,
197 loff_t pos, unsigned len, unsigned flags,
198 struct page **pagep, void **fsdata)
201 struct inode *inode = mapping->host;
202 int err = nilfs_transaction_begin(inode->i_sb, NULL, 1);
204 if (unlikely(err))
205 return err;
207 err = block_write_begin(mapping, pos, len, flags, pagep,
208 nilfs_get_block);
209 if (unlikely(err)) {
210 loff_t isize = mapping->host->i_size;
211 if (pos + len > isize)
212 vmtruncate(mapping->host, isize);
214 nilfs_transaction_abort(inode->i_sb);
216 return err;
219 static int nilfs_write_end(struct file *file, struct address_space *mapping,
220 loff_t pos, unsigned len, unsigned copied,
221 struct page *page, void *fsdata)
223 struct inode *inode = mapping->host;
224 unsigned start = pos & (PAGE_CACHE_SIZE - 1);
225 unsigned nr_dirty;
226 int err;
228 nr_dirty = nilfs_page_count_clean_buffers(page, start,
229 start + copied);
230 copied = generic_write_end(file, mapping, pos, len, copied, page,
231 fsdata);
232 nilfs_set_file_dirty(NILFS_SB(inode->i_sb), inode, nr_dirty);
233 err = nilfs_transaction_commit(inode->i_sb);
234 return err ? : copied;
237 static ssize_t
238 nilfs_direct_IO(int rw, struct kiocb *iocb, const struct iovec *iov,
239 loff_t offset, unsigned long nr_segs)
241 struct file *file = iocb->ki_filp;
242 struct inode *inode = file->f_mapping->host;
243 ssize_t size;
245 if (rw == WRITE)
246 return 0;
248 /* Needs synchronization with the cleaner */
249 size = blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov,
250 offset, nr_segs, nilfs_get_block, NULL);
253 * In case of error extending write may have instantiated a few
254 * blocks outside i_size. Trim these off again.
256 if (unlikely((rw & WRITE) && size < 0)) {
257 loff_t isize = i_size_read(inode);
258 loff_t end = offset + iov_length(iov, nr_segs);
260 if (end > isize)
261 vmtruncate(inode, isize);
264 return size;
267 const struct address_space_operations nilfs_aops = {
268 .writepage = nilfs_writepage,
269 .readpage = nilfs_readpage,
270 .sync_page = block_sync_page,
271 .writepages = nilfs_writepages,
272 .set_page_dirty = nilfs_set_page_dirty,
273 .readpages = nilfs_readpages,
274 .write_begin = nilfs_write_begin,
275 .write_end = nilfs_write_end,
276 /* .releasepage = nilfs_releasepage, */
277 .invalidatepage = block_invalidatepage,
278 .direct_IO = nilfs_direct_IO,
279 .is_partially_uptodate = block_is_partially_uptodate,
282 struct inode *nilfs_new_inode(struct inode *dir, int mode)
284 struct super_block *sb = dir->i_sb;
285 struct nilfs_sb_info *sbi = NILFS_SB(sb);
286 struct inode *inode;
287 struct nilfs_inode_info *ii;
288 struct nilfs_root *root;
289 int err = -ENOMEM;
290 ino_t ino;
292 inode = new_inode(sb);
293 if (unlikely(!inode))
294 goto failed;
296 mapping_set_gfp_mask(inode->i_mapping,
297 mapping_gfp_mask(inode->i_mapping) & ~__GFP_FS);
299 root = NILFS_I(dir)->i_root;
300 ii = NILFS_I(inode);
301 ii->i_state = 1 << NILFS_I_NEW;
302 ii->i_root = root;
304 err = nilfs_ifile_create_inode(root->ifile, &ino, &ii->i_bh);
305 if (unlikely(err))
306 goto failed_ifile_create_inode;
307 /* reference count of i_bh inherits from nilfs_mdt_read_block() */
309 atomic_inc(&root->inodes_count);
310 inode_init_owner(inode, dir, mode);
311 inode->i_ino = ino;
312 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
314 if (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode)) {
315 err = nilfs_bmap_read(ii->i_bmap, NULL);
316 if (err < 0)
317 goto failed_bmap;
319 set_bit(NILFS_I_BMAP, &ii->i_state);
320 /* No lock is needed; iget() ensures it. */
323 ii->i_flags = NILFS_I(dir)->i_flags;
324 if (S_ISLNK(mode))
325 ii->i_flags &= ~(NILFS_IMMUTABLE_FL | NILFS_APPEND_FL);
326 if (!S_ISDIR(mode))
327 ii->i_flags &= ~NILFS_DIRSYNC_FL;
329 /* ii->i_file_acl = 0; */
330 /* ii->i_dir_acl = 0; */
331 ii->i_dir_start_lookup = 0;
332 nilfs_set_inode_flags(inode);
333 spin_lock(&sbi->s_next_gen_lock);
334 inode->i_generation = sbi->s_next_generation++;
335 spin_unlock(&sbi->s_next_gen_lock);
336 insert_inode_hash(inode);
338 err = nilfs_init_acl(inode, dir);
339 if (unlikely(err))
340 goto failed_acl; /* never occur. When supporting
341 nilfs_init_acl(), proper cancellation of
342 above jobs should be considered */
344 return inode;
346 failed_acl:
347 failed_bmap:
348 inode->i_nlink = 0;
349 iput(inode); /* raw_inode will be deleted through
350 generic_delete_inode() */
351 goto failed;
353 failed_ifile_create_inode:
354 make_bad_inode(inode);
355 iput(inode); /* if i_nlink == 1, generic_forget_inode() will be
356 called */
357 failed:
358 return ERR_PTR(err);
361 void nilfs_set_inode_flags(struct inode *inode)
363 unsigned int flags = NILFS_I(inode)->i_flags;
365 inode->i_flags &= ~(S_SYNC | S_APPEND | S_IMMUTABLE | S_NOATIME |
366 S_DIRSYNC);
367 if (flags & NILFS_SYNC_FL)
368 inode->i_flags |= S_SYNC;
369 if (flags & NILFS_APPEND_FL)
370 inode->i_flags |= S_APPEND;
371 if (flags & NILFS_IMMUTABLE_FL)
372 inode->i_flags |= S_IMMUTABLE;
373 #ifndef NILFS_ATIME_DISABLE
374 if (flags & NILFS_NOATIME_FL)
375 #endif
376 inode->i_flags |= S_NOATIME;
377 if (flags & NILFS_DIRSYNC_FL)
378 inode->i_flags |= S_DIRSYNC;
379 mapping_set_gfp_mask(inode->i_mapping,
380 mapping_gfp_mask(inode->i_mapping) & ~__GFP_FS);
383 int nilfs_read_inode_common(struct inode *inode,
384 struct nilfs_inode *raw_inode)
386 struct nilfs_inode_info *ii = NILFS_I(inode);
387 int err;
389 inode->i_mode = le16_to_cpu(raw_inode->i_mode);
390 inode->i_uid = (uid_t)le32_to_cpu(raw_inode->i_uid);
391 inode->i_gid = (gid_t)le32_to_cpu(raw_inode->i_gid);
392 inode->i_nlink = le16_to_cpu(raw_inode->i_links_count);
393 inode->i_size = le64_to_cpu(raw_inode->i_size);
394 inode->i_atime.tv_sec = le64_to_cpu(raw_inode->i_mtime);
395 inode->i_ctime.tv_sec = le64_to_cpu(raw_inode->i_ctime);
396 inode->i_mtime.tv_sec = le64_to_cpu(raw_inode->i_mtime);
397 inode->i_atime.tv_nsec = le32_to_cpu(raw_inode->i_mtime_nsec);
398 inode->i_ctime.tv_nsec = le32_to_cpu(raw_inode->i_ctime_nsec);
399 inode->i_mtime.tv_nsec = le32_to_cpu(raw_inode->i_mtime_nsec);
400 if (inode->i_nlink == 0 && inode->i_mode == 0)
401 return -EINVAL; /* this inode is deleted */
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_dir_start_lookup = 0;
411 inode->i_generation = le32_to_cpu(raw_inode->i_generation);
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. */
421 return 0;
424 static int __nilfs_read_inode(struct super_block *sb,
425 struct nilfs_root *root, unsigned long ino,
426 struct inode *inode)
428 struct nilfs_sb_info *sbi = NILFS_SB(sb);
429 struct inode *dat = nilfs_dat_inode(sbi->s_nilfs);
430 struct buffer_head *bh;
431 struct nilfs_inode *raw_inode;
432 int err;
434 down_read(&NILFS_MDT(dat)->mi_sem); /* XXX */
435 err = nilfs_ifile_get_inode_block(root->ifile, ino, &bh);
436 if (unlikely(err))
437 goto bad_inode;
439 raw_inode = nilfs_ifile_map_inode(root->ifile, ino, bh);
441 err = nilfs_read_inode_common(inode, raw_inode);
442 if (err)
443 goto failed_unmap;
445 if (S_ISREG(inode->i_mode)) {
446 inode->i_op = &nilfs_file_inode_operations;
447 inode->i_fop = &nilfs_file_operations;
448 inode->i_mapping->a_ops = &nilfs_aops;
449 } else if (S_ISDIR(inode->i_mode)) {
450 inode->i_op = &nilfs_dir_inode_operations;
451 inode->i_fop = &nilfs_dir_operations;
452 inode->i_mapping->a_ops = &nilfs_aops;
453 } else if (S_ISLNK(inode->i_mode)) {
454 inode->i_op = &nilfs_symlink_inode_operations;
455 inode->i_mapping->a_ops = &nilfs_aops;
456 } else {
457 inode->i_op = &nilfs_special_inode_operations;
458 init_special_inode(
459 inode, inode->i_mode,
460 huge_decode_dev(le64_to_cpu(raw_inode->i_device_code)));
462 nilfs_ifile_unmap_inode(root->ifile, ino, bh);
463 brelse(bh);
464 up_read(&NILFS_MDT(dat)->mi_sem); /* XXX */
465 nilfs_set_inode_flags(inode);
466 return 0;
468 failed_unmap:
469 nilfs_ifile_unmap_inode(root->ifile, ino, bh);
470 brelse(bh);
472 bad_inode:
473 up_read(&NILFS_MDT(dat)->mi_sem); /* XXX */
474 return err;
477 static int nilfs_iget_test(struct inode *inode, void *opaque)
479 struct nilfs_iget_args *args = opaque;
480 struct nilfs_inode_info *ii;
482 if (args->ino != inode->i_ino || args->root != NILFS_I(inode)->i_root)
483 return 0;
485 ii = NILFS_I(inode);
486 if (!test_bit(NILFS_I_GCINODE, &ii->i_state))
487 return !args->for_gc;
489 return args->for_gc && args->cno == ii->i_cno;
492 static int nilfs_iget_set(struct inode *inode, void *opaque)
494 struct nilfs_iget_args *args = opaque;
496 inode->i_ino = args->ino;
497 if (args->for_gc) {
498 NILFS_I(inode)->i_state = 1 << NILFS_I_GCINODE;
499 NILFS_I(inode)->i_cno = args->cno;
500 NILFS_I(inode)->i_root = NULL;
501 } else {
502 if (args->root && args->ino == NILFS_ROOT_INO)
503 nilfs_get_root(args->root);
504 NILFS_I(inode)->i_root = args->root;
506 return 0;
509 struct inode *nilfs_ilookup(struct super_block *sb, struct nilfs_root *root,
510 unsigned long ino)
512 struct nilfs_iget_args args = {
513 .ino = ino, .root = root, .cno = 0, .for_gc = 0
516 return ilookup5(sb, ino, nilfs_iget_test, &args);
519 struct inode *nilfs_iget_locked(struct super_block *sb, struct nilfs_root *root,
520 unsigned long ino)
522 struct nilfs_iget_args args = {
523 .ino = ino, .root = root, .cno = 0, .for_gc = 0
526 return iget5_locked(sb, ino, nilfs_iget_test, nilfs_iget_set, &args);
529 struct inode *nilfs_iget(struct super_block *sb, struct nilfs_root *root,
530 unsigned long ino)
532 struct inode *inode;
533 int err;
535 inode = nilfs_iget_locked(sb, root, ino);
536 if (unlikely(!inode))
537 return ERR_PTR(-ENOMEM);
538 if (!(inode->i_state & I_NEW))
539 return inode;
541 err = __nilfs_read_inode(sb, root, ino, inode);
542 if (unlikely(err)) {
543 iget_failed(inode);
544 return ERR_PTR(err);
546 unlock_new_inode(inode);
547 return inode;
550 struct inode *nilfs_iget_for_gc(struct super_block *sb, unsigned long ino,
551 __u64 cno)
553 struct nilfs_iget_args args = {
554 .ino = ino, .root = NULL, .cno = cno, .for_gc = 1
556 struct inode *inode;
557 int err;
559 inode = iget5_locked(sb, ino, nilfs_iget_test, nilfs_iget_set, &args);
560 if (unlikely(!inode))
561 return ERR_PTR(-ENOMEM);
562 if (!(inode->i_state & I_NEW))
563 return inode;
565 err = nilfs_init_gcinode(inode);
566 if (unlikely(err)) {
567 iget_failed(inode);
568 return ERR_PTR(err);
570 unlock_new_inode(inode);
571 return inode;
574 void nilfs_write_inode_common(struct inode *inode,
575 struct nilfs_inode *raw_inode, int has_bmap)
577 struct nilfs_inode_info *ii = NILFS_I(inode);
579 raw_inode->i_mode = cpu_to_le16(inode->i_mode);
580 raw_inode->i_uid = cpu_to_le32(inode->i_uid);
581 raw_inode->i_gid = cpu_to_le32(inode->i_gid);
582 raw_inode->i_links_count = cpu_to_le16(inode->i_nlink);
583 raw_inode->i_size = cpu_to_le64(inode->i_size);
584 raw_inode->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec);
585 raw_inode->i_mtime = cpu_to_le64(inode->i_mtime.tv_sec);
586 raw_inode->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
587 raw_inode->i_mtime_nsec = cpu_to_le32(inode->i_mtime.tv_nsec);
588 raw_inode->i_blocks = cpu_to_le64(inode->i_blocks);
590 raw_inode->i_flags = cpu_to_le32(ii->i_flags);
591 raw_inode->i_generation = cpu_to_le32(inode->i_generation);
593 if (has_bmap)
594 nilfs_bmap_write(ii->i_bmap, raw_inode);
595 else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
596 raw_inode->i_device_code =
597 cpu_to_le64(huge_encode_dev(inode->i_rdev));
598 /* When extending inode, nilfs->ns_inode_size should be checked
599 for substitutions of appended fields */
602 void nilfs_update_inode(struct inode *inode, struct buffer_head *ibh)
604 ino_t ino = inode->i_ino;
605 struct nilfs_inode_info *ii = NILFS_I(inode);
606 struct inode *ifile = ii->i_root->ifile;
607 struct nilfs_inode *raw_inode;
609 raw_inode = nilfs_ifile_map_inode(ifile, ino, ibh);
611 if (test_and_clear_bit(NILFS_I_NEW, &ii->i_state))
612 memset(raw_inode, 0, NILFS_MDT(ifile)->mi_entry_size);
613 set_bit(NILFS_I_INODE_DIRTY, &ii->i_state);
615 nilfs_write_inode_common(inode, raw_inode, 0);
616 /* XXX: call with has_bmap = 0 is a workaround to avoid
617 deadlock of bmap. This delays update of i_bmap to just
618 before writing */
619 nilfs_ifile_unmap_inode(ifile, ino, ibh);
622 #define NILFS_MAX_TRUNCATE_BLOCKS 16384 /* 64MB for 4KB block */
624 static void nilfs_truncate_bmap(struct nilfs_inode_info *ii,
625 unsigned long from)
627 unsigned long b;
628 int ret;
630 if (!test_bit(NILFS_I_BMAP, &ii->i_state))
631 return;
632 repeat:
633 ret = nilfs_bmap_last_key(ii->i_bmap, &b);
634 if (ret == -ENOENT)
635 return;
636 else if (ret < 0)
637 goto failed;
639 if (b < from)
640 return;
642 b -= min_t(unsigned long, NILFS_MAX_TRUNCATE_BLOCKS, b - from);
643 ret = nilfs_bmap_truncate(ii->i_bmap, b);
644 nilfs_relax_pressure_in_lock(ii->vfs_inode.i_sb);
645 if (!ret || (ret == -ENOMEM &&
646 nilfs_bmap_truncate(ii->i_bmap, b) == 0))
647 goto repeat;
649 failed:
650 if (ret == -EINVAL)
651 nilfs_error(ii->vfs_inode.i_sb, __func__,
652 "bmap is broken (ino=%lu)", ii->vfs_inode.i_ino);
653 else
654 nilfs_warning(ii->vfs_inode.i_sb, __func__,
655 "failed to truncate bmap (ino=%lu, err=%d)",
656 ii->vfs_inode.i_ino, ret);
659 void nilfs_truncate(struct inode *inode)
661 unsigned long blkoff;
662 unsigned int blocksize;
663 struct nilfs_transaction_info ti;
664 struct super_block *sb = inode->i_sb;
665 struct nilfs_inode_info *ii = NILFS_I(inode);
667 if (!test_bit(NILFS_I_BMAP, &ii->i_state))
668 return;
669 if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
670 return;
672 blocksize = sb->s_blocksize;
673 blkoff = (inode->i_size + blocksize - 1) >> sb->s_blocksize_bits;
674 nilfs_transaction_begin(sb, &ti, 0); /* never fails */
676 block_truncate_page(inode->i_mapping, inode->i_size, nilfs_get_block);
678 nilfs_truncate_bmap(ii, blkoff);
680 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
681 if (IS_SYNC(inode))
682 nilfs_set_transaction_flag(NILFS_TI_SYNC);
684 nilfs_mark_inode_dirty(inode);
685 nilfs_set_file_dirty(NILFS_SB(sb), inode, 0);
686 nilfs_transaction_commit(sb);
687 /* May construct a logical segment and may fail in sync mode.
688 But truncate has no return value. */
691 static void nilfs_clear_inode(struct inode *inode)
693 struct nilfs_inode_info *ii = NILFS_I(inode);
694 struct nilfs_mdt_info *mdi = NILFS_MDT(inode);
697 * Free resources allocated in nilfs_read_inode(), here.
699 BUG_ON(!list_empty(&ii->i_dirty));
700 brelse(ii->i_bh);
701 ii->i_bh = NULL;
703 if (mdi && mdi->mi_palloc_cache)
704 nilfs_palloc_destroy_cache(inode);
706 if (test_bit(NILFS_I_BMAP, &ii->i_state))
707 nilfs_bmap_clear(ii->i_bmap);
709 nilfs_btnode_cache_clear(&ii->i_btnode_cache);
711 if (ii->i_root && inode->i_ino == NILFS_ROOT_INO)
712 nilfs_put_root(ii->i_root);
715 void nilfs_evict_inode(struct inode *inode)
717 struct nilfs_transaction_info ti;
718 struct super_block *sb = inode->i_sb;
719 struct nilfs_inode_info *ii = NILFS_I(inode);
721 if (inode->i_nlink || !ii->i_root || unlikely(is_bad_inode(inode))) {
722 if (inode->i_data.nrpages)
723 truncate_inode_pages(&inode->i_data, 0);
724 end_writeback(inode);
725 nilfs_clear_inode(inode);
726 return;
728 nilfs_transaction_begin(sb, &ti, 0); /* never fails */
730 if (inode->i_data.nrpages)
731 truncate_inode_pages(&inode->i_data, 0);
733 /* TODO: some of the following operations may fail. */
734 nilfs_truncate_bmap(ii, 0);
735 nilfs_mark_inode_dirty(inode);
736 end_writeback(inode);
738 nilfs_ifile_delete_inode(ii->i_root->ifile, inode->i_ino);
739 atomic_dec(&ii->i_root->inodes_count);
741 nilfs_clear_inode(inode);
743 if (IS_SYNC(inode))
744 nilfs_set_transaction_flag(NILFS_TI_SYNC);
745 nilfs_transaction_commit(sb);
746 /* May construct a logical segment and may fail in sync mode.
747 But delete_inode has no return value. */
750 int nilfs_setattr(struct dentry *dentry, struct iattr *iattr)
752 struct nilfs_transaction_info ti;
753 struct inode *inode = dentry->d_inode;
754 struct super_block *sb = inode->i_sb;
755 int err;
757 err = inode_change_ok(inode, iattr);
758 if (err)
759 return err;
761 err = nilfs_transaction_begin(sb, &ti, 0);
762 if (unlikely(err))
763 return err;
765 if ((iattr->ia_valid & ATTR_SIZE) &&
766 iattr->ia_size != i_size_read(inode)) {
767 err = vmtruncate(inode, iattr->ia_size);
768 if (unlikely(err))
769 goto out_err;
772 setattr_copy(inode, iattr);
773 mark_inode_dirty(inode);
775 if (iattr->ia_valid & ATTR_MODE) {
776 err = nilfs_acl_chmod(inode);
777 if (unlikely(err))
778 goto out_err;
781 return nilfs_transaction_commit(sb);
783 out_err:
784 nilfs_transaction_abort(sb);
785 return err;
788 int nilfs_permission(struct inode *inode, int mask)
790 struct nilfs_root *root = NILFS_I(inode)->i_root;
792 if ((mask & MAY_WRITE) && root &&
793 root->cno != NILFS_CPTREE_CURRENT_CNO)
794 return -EROFS; /* snapshot is not writable */
796 return generic_permission(inode, mask, NULL);
799 int nilfs_load_inode_block(struct nilfs_sb_info *sbi, struct inode *inode,
800 struct buffer_head **pbh)
802 struct nilfs_inode_info *ii = NILFS_I(inode);
803 int err;
805 spin_lock(&sbi->s_inode_lock);
806 if (ii->i_bh == NULL) {
807 spin_unlock(&sbi->s_inode_lock);
808 err = nilfs_ifile_get_inode_block(ii->i_root->ifile,
809 inode->i_ino, pbh);
810 if (unlikely(err))
811 return err;
812 spin_lock(&sbi->s_inode_lock);
813 if (ii->i_bh == NULL)
814 ii->i_bh = *pbh;
815 else {
816 brelse(*pbh);
817 *pbh = ii->i_bh;
819 } else
820 *pbh = ii->i_bh;
822 get_bh(*pbh);
823 spin_unlock(&sbi->s_inode_lock);
824 return 0;
827 int nilfs_inode_dirty(struct inode *inode)
829 struct nilfs_inode_info *ii = NILFS_I(inode);
830 struct nilfs_sb_info *sbi = NILFS_SB(inode->i_sb);
831 int ret = 0;
833 if (!list_empty(&ii->i_dirty)) {
834 spin_lock(&sbi->s_inode_lock);
835 ret = test_bit(NILFS_I_DIRTY, &ii->i_state) ||
836 test_bit(NILFS_I_BUSY, &ii->i_state);
837 spin_unlock(&sbi->s_inode_lock);
839 return ret;
842 int nilfs_set_file_dirty(struct nilfs_sb_info *sbi, struct inode *inode,
843 unsigned nr_dirty)
845 struct nilfs_inode_info *ii = NILFS_I(inode);
847 atomic_add(nr_dirty, &sbi->s_nilfs->ns_ndirtyblks);
849 if (test_and_set_bit(NILFS_I_DIRTY, &ii->i_state))
850 return 0;
852 spin_lock(&sbi->s_inode_lock);
853 if (!test_bit(NILFS_I_QUEUED, &ii->i_state) &&
854 !test_bit(NILFS_I_BUSY, &ii->i_state)) {
855 /* Because this routine may race with nilfs_dispose_list(),
856 we have to check NILFS_I_QUEUED here, too. */
857 if (list_empty(&ii->i_dirty) && igrab(inode) == NULL) {
858 /* This will happen when somebody is freeing
859 this inode. */
860 nilfs_warning(sbi->s_super, __func__,
861 "cannot get inode (ino=%lu)\n",
862 inode->i_ino);
863 spin_unlock(&sbi->s_inode_lock);
864 return -EINVAL; /* NILFS_I_DIRTY may remain for
865 freeing inode */
867 list_del(&ii->i_dirty);
868 list_add_tail(&ii->i_dirty, &sbi->s_dirty_files);
869 set_bit(NILFS_I_QUEUED, &ii->i_state);
871 spin_unlock(&sbi->s_inode_lock);
872 return 0;
875 int nilfs_mark_inode_dirty(struct inode *inode)
877 struct nilfs_sb_info *sbi = NILFS_SB(inode->i_sb);
878 struct buffer_head *ibh;
879 int err;
881 err = nilfs_load_inode_block(sbi, inode, &ibh);
882 if (unlikely(err)) {
883 nilfs_warning(inode->i_sb, __func__,
884 "failed to reget inode block.\n");
885 return err;
887 nilfs_update_inode(inode, ibh);
888 nilfs_mdt_mark_buffer_dirty(ibh);
889 nilfs_mdt_mark_dirty(NILFS_I(inode)->i_root->ifile);
890 brelse(ibh);
891 return 0;
895 * nilfs_dirty_inode - reflect changes on given inode to an inode block.
896 * @inode: inode of the file to be registered.
898 * nilfs_dirty_inode() loads a inode block containing the specified
899 * @inode and copies data from a nilfs_inode to a corresponding inode
900 * entry in the inode block. This operation is excluded from the segment
901 * construction. This function can be called both as a single operation
902 * and as a part of indivisible file operations.
904 void nilfs_dirty_inode(struct inode *inode)
906 struct nilfs_transaction_info ti;
907 struct nilfs_mdt_info *mdi = NILFS_MDT(inode);
909 if (is_bad_inode(inode)) {
910 nilfs_warning(inode->i_sb, __func__,
911 "tried to mark bad_inode dirty. ignored.\n");
912 dump_stack();
913 return;
915 if (mdi) {
916 nilfs_mdt_mark_dirty(inode);
917 return;
919 nilfs_transaction_begin(inode->i_sb, &ti, 0);
920 nilfs_mark_inode_dirty(inode);
921 nilfs_transaction_commit(inode->i_sb); /* never fails */