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>
37 struct nilfs_iget_args {
40 struct nilfs_root *root;
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
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);
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);
70 bh_result->b_size = (ret << inode->i_blkbits);
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);
81 err = nilfs_bmap_insert(ii->i_bmap, (unsigned long)blkoff,
82 (unsigned long)bh_result);
83 if (unlikely(err != 0)) {
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.
92 "nilfs_get_block: a race condition "
93 "while inserting a data block. "
94 "(inode number=%lu, file block "
97 (unsigned long long)blkoff);
99 } else if (err == -EINVAL) {
100 nilfs_error(inode->i_sb, __func__,
101 "broken bmap (inode=%lu)\n",
105 nilfs_transaction_abort(inode->i_sb);
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
114 } else if (ret == -ENOENT) {
115 /* not found is not error (e.g. hole); must return without
116 the mapped state flag. */
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;
157 if (wbc->sync_mode == WB_SYNC_ALL)
158 err = nilfs_construct_dsync_segment(inode->i_sb, inode,
164 static int nilfs_writepage(struct page *page, struct writeback_control *wbc)
166 struct inode *inode = page->mapping->host;
169 redirty_page_for_writepage(wbc, page);
172 if (wbc->sync_mode == WB_SYNC_ALL) {
173 err = nilfs_construct_segment(inode->i_sb);
176 } else if (wbc->for_reclaim)
177 nilfs_flush_segment(inode->i_sb, inode->i_ino);
182 static int nilfs_set_page_dirty(struct page *page)
184 int ret = __set_page_dirty_buffers(page);
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);
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);
207 err = block_write_begin(mapping, pos, len, flags, pagep,
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);
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);
228 nr_dirty = nilfs_page_count_clean_buffers(page, start,
230 copied = generic_write_end(file, mapping, pos, len, copied, page,
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;
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;
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);
261 vmtruncate(inode, isize);
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);
287 struct nilfs_inode_info *ii;
288 struct nilfs_root *root;
292 inode = new_inode(sb);
293 if (unlikely(!inode))
296 mapping_set_gfp_mask(inode->i_mapping,
297 mapping_gfp_mask(inode->i_mapping) & ~__GFP_FS);
299 root = NILFS_I(dir)->i_root;
301 ii->i_state = 1 << NILFS_I_NEW;
304 err = nilfs_ifile_create_inode(root->ifile, &ino, &ii->i_bh);
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);
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);
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;
325 ii->i_flags &= ~(NILFS_IMMUTABLE_FL | NILFS_APPEND_FL);
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);
340 goto failed_acl; /* never occur. When supporting
341 nilfs_init_acl(), proper cancellation of
342 above jobs should be considered */
349 iput(inode); /* raw_inode will be deleted through
350 generic_delete_inode() */
353 failed_ifile_create_inode:
354 make_bad_inode(inode);
355 iput(inode); /* if i_nlink == 1, generic_forget_inode() will be
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 |
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)
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);
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);
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);
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);
418 set_bit(NILFS_I_BMAP, &ii->i_state);
419 /* No lock is needed; iget() ensures it. */
424 static int __nilfs_read_inode(struct super_block *sb,
425 struct nilfs_root *root, unsigned long ino,
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;
434 down_read(&NILFS_MDT(dat)->mi_sem); /* XXX */
435 err = nilfs_ifile_get_inode_block(root->ifile, ino, &bh);
439 raw_inode = nilfs_ifile_map_inode(root->ifile, ino, bh);
441 err = nilfs_read_inode_common(inode, raw_inode);
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;
457 inode->i_op = &nilfs_special_inode_operations;
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);
464 up_read(&NILFS_MDT(dat)->mi_sem); /* XXX */
465 nilfs_set_inode_flags(inode);
469 nilfs_ifile_unmap_inode(root->ifile, ino, bh);
473 up_read(&NILFS_MDT(dat)->mi_sem); /* XXX */
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)
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;
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;
502 if (args->root && args->ino == NILFS_ROOT_INO)
503 nilfs_get_root(args->root);
504 NILFS_I(inode)->i_root = args->root;
509 struct inode *nilfs_iget(struct super_block *sb, struct nilfs_root *root,
512 struct nilfs_iget_args args = {
513 .ino = ino, .root = root, .cno = 0, .for_gc = 0
518 inode = iget5_locked(sb, ino, nilfs_iget_test, nilfs_iget_set, &args);
519 if (unlikely(!inode))
520 return ERR_PTR(-ENOMEM);
521 if (!(inode->i_state & I_NEW))
524 err = __nilfs_read_inode(sb, root, ino, inode);
529 unlock_new_inode(inode);
533 struct inode *nilfs_iget_for_gc(struct super_block *sb, unsigned long ino,
536 struct nilfs_iget_args args = {
537 .ino = ino, .root = NULL, .cno = cno, .for_gc = 1
542 inode = iget5_locked(sb, ino, nilfs_iget_test, nilfs_iget_set, &args);
543 if (unlikely(!inode))
544 return ERR_PTR(-ENOMEM);
545 if (!(inode->i_state & I_NEW))
548 err = nilfs_init_gcinode(inode);
553 unlock_new_inode(inode);
557 void nilfs_write_inode_common(struct inode *inode,
558 struct nilfs_inode *raw_inode, int has_bmap)
560 struct nilfs_inode_info *ii = NILFS_I(inode);
562 raw_inode->i_mode = cpu_to_le16(inode->i_mode);
563 raw_inode->i_uid = cpu_to_le32(inode->i_uid);
564 raw_inode->i_gid = cpu_to_le32(inode->i_gid);
565 raw_inode->i_links_count = cpu_to_le16(inode->i_nlink);
566 raw_inode->i_size = cpu_to_le64(inode->i_size);
567 raw_inode->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec);
568 raw_inode->i_mtime = cpu_to_le64(inode->i_mtime.tv_sec);
569 raw_inode->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
570 raw_inode->i_mtime_nsec = cpu_to_le32(inode->i_mtime.tv_nsec);
571 raw_inode->i_blocks = cpu_to_le64(inode->i_blocks);
573 raw_inode->i_flags = cpu_to_le32(ii->i_flags);
574 raw_inode->i_generation = cpu_to_le32(inode->i_generation);
577 nilfs_bmap_write(ii->i_bmap, raw_inode);
578 else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
579 raw_inode->i_device_code =
580 cpu_to_le64(huge_encode_dev(inode->i_rdev));
581 /* When extending inode, nilfs->ns_inode_size should be checked
582 for substitutions of appended fields */
585 void nilfs_update_inode(struct inode *inode, struct buffer_head *ibh)
587 ino_t ino = inode->i_ino;
588 struct nilfs_inode_info *ii = NILFS_I(inode);
589 struct inode *ifile = ii->i_root->ifile;
590 struct nilfs_inode *raw_inode;
592 raw_inode = nilfs_ifile_map_inode(ifile, ino, ibh);
594 if (test_and_clear_bit(NILFS_I_NEW, &ii->i_state))
595 memset(raw_inode, 0, NILFS_MDT(ifile)->mi_entry_size);
596 set_bit(NILFS_I_INODE_DIRTY, &ii->i_state);
598 nilfs_write_inode_common(inode, raw_inode, 0);
599 /* XXX: call with has_bmap = 0 is a workaround to avoid
600 deadlock of bmap. This delays update of i_bmap to just
602 nilfs_ifile_unmap_inode(ifile, ino, ibh);
605 #define NILFS_MAX_TRUNCATE_BLOCKS 16384 /* 64MB for 4KB block */
607 static void nilfs_truncate_bmap(struct nilfs_inode_info *ii,
613 if (!test_bit(NILFS_I_BMAP, &ii->i_state))
616 ret = nilfs_bmap_last_key(ii->i_bmap, &b);
625 b -= min_t(unsigned long, NILFS_MAX_TRUNCATE_BLOCKS, b - from);
626 ret = nilfs_bmap_truncate(ii->i_bmap, b);
627 nilfs_relax_pressure_in_lock(ii->vfs_inode.i_sb);
628 if (!ret || (ret == -ENOMEM &&
629 nilfs_bmap_truncate(ii->i_bmap, b) == 0))
634 nilfs_error(ii->vfs_inode.i_sb, __func__,
635 "bmap is broken (ino=%lu)", ii->vfs_inode.i_ino);
637 nilfs_warning(ii->vfs_inode.i_sb, __func__,
638 "failed to truncate bmap (ino=%lu, err=%d)",
639 ii->vfs_inode.i_ino, ret);
642 void nilfs_truncate(struct inode *inode)
644 unsigned long blkoff;
645 unsigned int blocksize;
646 struct nilfs_transaction_info ti;
647 struct super_block *sb = inode->i_sb;
648 struct nilfs_inode_info *ii = NILFS_I(inode);
650 if (!test_bit(NILFS_I_BMAP, &ii->i_state))
652 if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
655 blocksize = sb->s_blocksize;
656 blkoff = (inode->i_size + blocksize - 1) >> sb->s_blocksize_bits;
657 nilfs_transaction_begin(sb, &ti, 0); /* never fails */
659 block_truncate_page(inode->i_mapping, inode->i_size, nilfs_get_block);
661 nilfs_truncate_bmap(ii, blkoff);
663 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
665 nilfs_set_transaction_flag(NILFS_TI_SYNC);
667 nilfs_mark_inode_dirty(inode);
668 nilfs_set_file_dirty(NILFS_SB(sb), inode, 0);
669 nilfs_transaction_commit(sb);
670 /* May construct a logical segment and may fail in sync mode.
671 But truncate has no return value. */
674 static void nilfs_clear_inode(struct inode *inode)
676 struct nilfs_inode_info *ii = NILFS_I(inode);
679 * Free resources allocated in nilfs_read_inode(), here.
681 BUG_ON(!list_empty(&ii->i_dirty));
685 if (test_bit(NILFS_I_BMAP, &ii->i_state))
686 nilfs_bmap_clear(ii->i_bmap);
688 nilfs_btnode_cache_clear(&ii->i_btnode_cache);
690 if (ii->i_root && inode->i_ino == NILFS_ROOT_INO)
691 nilfs_put_root(ii->i_root);
694 void nilfs_evict_inode(struct inode *inode)
696 struct nilfs_transaction_info ti;
697 struct super_block *sb = inode->i_sb;
698 struct nilfs_inode_info *ii = NILFS_I(inode);
700 if (inode->i_nlink || !ii->i_root || unlikely(is_bad_inode(inode))) {
701 if (inode->i_data.nrpages)
702 truncate_inode_pages(&inode->i_data, 0);
703 end_writeback(inode);
704 nilfs_clear_inode(inode);
707 nilfs_transaction_begin(sb, &ti, 0); /* never fails */
709 if (inode->i_data.nrpages)
710 truncate_inode_pages(&inode->i_data, 0);
712 /* TODO: some of the following operations may fail. */
713 nilfs_truncate_bmap(ii, 0);
714 nilfs_mark_inode_dirty(inode);
715 end_writeback(inode);
717 nilfs_ifile_delete_inode(ii->i_root->ifile, inode->i_ino);
718 atomic_dec(&ii->i_root->inodes_count);
720 nilfs_clear_inode(inode);
723 nilfs_set_transaction_flag(NILFS_TI_SYNC);
724 nilfs_transaction_commit(sb);
725 /* May construct a logical segment and may fail in sync mode.
726 But delete_inode has no return value. */
729 int nilfs_setattr(struct dentry *dentry, struct iattr *iattr)
731 struct nilfs_transaction_info ti;
732 struct inode *inode = dentry->d_inode;
733 struct super_block *sb = inode->i_sb;
736 err = inode_change_ok(inode, iattr);
740 err = nilfs_transaction_begin(sb, &ti, 0);
744 if ((iattr->ia_valid & ATTR_SIZE) &&
745 iattr->ia_size != i_size_read(inode)) {
746 err = vmtruncate(inode, iattr->ia_size);
751 setattr_copy(inode, iattr);
752 mark_inode_dirty(inode);
754 if (iattr->ia_valid & ATTR_MODE) {
755 err = nilfs_acl_chmod(inode);
760 return nilfs_transaction_commit(sb);
763 nilfs_transaction_abort(sb);
767 int nilfs_permission(struct inode *inode, int mask)
769 struct nilfs_root *root = NILFS_I(inode)->i_root;
771 if ((mask & MAY_WRITE) && root &&
772 root->cno != NILFS_CPTREE_CURRENT_CNO)
773 return -EROFS; /* snapshot is not writable */
775 return generic_permission(inode, mask, NULL);
778 int nilfs_load_inode_block(struct nilfs_sb_info *sbi, struct inode *inode,
779 struct buffer_head **pbh)
781 struct nilfs_inode_info *ii = NILFS_I(inode);
784 spin_lock(&sbi->s_inode_lock);
785 if (ii->i_bh == NULL) {
786 spin_unlock(&sbi->s_inode_lock);
787 err = nilfs_ifile_get_inode_block(ii->i_root->ifile,
791 spin_lock(&sbi->s_inode_lock);
792 if (ii->i_bh == NULL)
802 spin_unlock(&sbi->s_inode_lock);
806 int nilfs_inode_dirty(struct inode *inode)
808 struct nilfs_inode_info *ii = NILFS_I(inode);
809 struct nilfs_sb_info *sbi = NILFS_SB(inode->i_sb);
812 if (!list_empty(&ii->i_dirty)) {
813 spin_lock(&sbi->s_inode_lock);
814 ret = test_bit(NILFS_I_DIRTY, &ii->i_state) ||
815 test_bit(NILFS_I_BUSY, &ii->i_state);
816 spin_unlock(&sbi->s_inode_lock);
821 int nilfs_set_file_dirty(struct nilfs_sb_info *sbi, struct inode *inode,
824 struct nilfs_inode_info *ii = NILFS_I(inode);
826 atomic_add(nr_dirty, &sbi->s_nilfs->ns_ndirtyblks);
828 if (test_and_set_bit(NILFS_I_DIRTY, &ii->i_state))
831 spin_lock(&sbi->s_inode_lock);
832 if (!test_bit(NILFS_I_QUEUED, &ii->i_state) &&
833 !test_bit(NILFS_I_BUSY, &ii->i_state)) {
834 /* Because this routine may race with nilfs_dispose_list(),
835 we have to check NILFS_I_QUEUED here, too. */
836 if (list_empty(&ii->i_dirty) && igrab(inode) == NULL) {
837 /* This will happen when somebody is freeing
839 nilfs_warning(sbi->s_super, __func__,
840 "cannot get inode (ino=%lu)\n",
842 spin_unlock(&sbi->s_inode_lock);
843 return -EINVAL; /* NILFS_I_DIRTY may remain for
846 list_del(&ii->i_dirty);
847 list_add_tail(&ii->i_dirty, &sbi->s_dirty_files);
848 set_bit(NILFS_I_QUEUED, &ii->i_state);
850 spin_unlock(&sbi->s_inode_lock);
854 int nilfs_mark_inode_dirty(struct inode *inode)
856 struct nilfs_sb_info *sbi = NILFS_SB(inode->i_sb);
857 struct buffer_head *ibh;
860 err = nilfs_load_inode_block(sbi, inode, &ibh);
862 nilfs_warning(inode->i_sb, __func__,
863 "failed to reget inode block.\n");
866 nilfs_update_inode(inode, ibh);
867 nilfs_mdt_mark_buffer_dirty(ibh);
868 nilfs_mdt_mark_dirty(NILFS_I(inode)->i_root->ifile);
874 * nilfs_dirty_inode - reflect changes on given inode to an inode block.
875 * @inode: inode of the file to be registered.
877 * nilfs_dirty_inode() loads a inode block containing the specified
878 * @inode and copies data from a nilfs_inode to a corresponding inode
879 * entry in the inode block. This operation is excluded from the segment
880 * construction. This function can be called both as a single operation
881 * and as a part of indivisible file operations.
883 void nilfs_dirty_inode(struct inode *inode)
885 struct nilfs_transaction_info ti;
886 struct nilfs_mdt_info *mdi = NILFS_MDT(inode);
888 if (is_bad_inode(inode)) {
889 nilfs_warning(inode->i_sb, __func__,
890 "tried to mark bad_inode dirty. ignored.\n");
895 nilfs_mdt_mark_dirty(inode);
898 nilfs_transaction_begin(inode->i_sb, &ti, 0);
899 nilfs_mark_inode_dirty(inode);
900 nilfs_transaction_commit(inode->i_sb); /* never fails */