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;
44 void nilfs_inode_add_blocks(struct inode *inode, int n)
46 struct nilfs_root *root = NILFS_I(inode)->i_root;
48 inode_add_bytes(inode, (1 << inode->i_blkbits) * n);
50 atomic_add(n, &root->blocks_count);
53 void nilfs_inode_sub_blocks(struct inode *inode, int n)
55 struct nilfs_root *root = NILFS_I(inode)->i_root;
57 inode_sub_bytes(inode, (1 << inode->i_blkbits) * n);
59 atomic_sub(n, &root->blocks_count);
63 * nilfs_get_block() - get a file block on the filesystem (callback function)
64 * @inode - inode struct of the target file
65 * @blkoff - file block number
66 * @bh_result - buffer head to be mapped on
67 * @create - indicate whether allocating the block or not when it has not
70 * This function does not issue actual read request of the specified data
71 * block. It is done by VFS.
73 int nilfs_get_block(struct inode *inode, sector_t blkoff,
74 struct buffer_head *bh_result, int create)
76 struct nilfs_inode_info *ii = NILFS_I(inode);
79 struct inode *dat = NILFS_I_NILFS(inode)->ns_dat;
80 unsigned maxblocks = bh_result->b_size >> inode->i_blkbits;
82 down_read(&NILFS_MDT(dat)->mi_sem);
83 ret = nilfs_bmap_lookup_contig(ii->i_bmap, blkoff, &blknum, maxblocks);
84 up_read(&NILFS_MDT(dat)->mi_sem);
85 if (ret >= 0) { /* found */
86 map_bh(bh_result, inode->i_sb, blknum);
88 bh_result->b_size = (ret << inode->i_blkbits);
91 /* data block was not found */
92 if (ret == -ENOENT && create) {
93 struct nilfs_transaction_info ti;
95 bh_result->b_blocknr = 0;
96 err = nilfs_transaction_begin(inode->i_sb, &ti, 1);
99 err = nilfs_bmap_insert(ii->i_bmap, (unsigned long)blkoff,
100 (unsigned long)bh_result);
101 if (unlikely(err != 0)) {
102 if (err == -EEXIST) {
104 * The get_block() function could be called
105 * from multiple callers for an inode.
106 * However, the page having this block must
107 * be locked in this case.
110 "nilfs_get_block: a race condition "
111 "while inserting a data block. "
112 "(inode number=%lu, file block "
115 (unsigned long long)blkoff);
118 nilfs_transaction_abort(inode->i_sb);
121 nilfs_mark_inode_dirty(inode);
122 nilfs_transaction_commit(inode->i_sb); /* never fails */
123 /* Error handling should be detailed */
124 set_buffer_new(bh_result);
125 set_buffer_delay(bh_result);
126 map_bh(bh_result, inode->i_sb, 0); /* dbn must be changed
128 } else if (ret == -ENOENT) {
129 /* not found is not error (e.g. hole); must return without
130 the mapped state flag. */
141 * nilfs_readpage() - implement readpage() method of nilfs_aops {}
142 * address_space_operations.
143 * @file - file struct of the file to be read
144 * @page - the page to be read
146 static int nilfs_readpage(struct file *file, struct page *page)
148 return mpage_readpage(page, nilfs_get_block);
152 * nilfs_readpages() - implement readpages() method of nilfs_aops {}
153 * address_space_operations.
154 * @file - file struct of the file to be read
155 * @mapping - address_space struct used for reading multiple pages
156 * @pages - the pages to be read
157 * @nr_pages - number of pages to be read
159 static int nilfs_readpages(struct file *file, struct address_space *mapping,
160 struct list_head *pages, unsigned nr_pages)
162 return mpage_readpages(mapping, pages, nr_pages, nilfs_get_block);
165 static int nilfs_writepages(struct address_space *mapping,
166 struct writeback_control *wbc)
168 struct inode *inode = mapping->host;
171 if (wbc->sync_mode == WB_SYNC_ALL)
172 err = nilfs_construct_dsync_segment(inode->i_sb, inode,
178 static int nilfs_writepage(struct page *page, struct writeback_control *wbc)
180 struct inode *inode = page->mapping->host;
183 redirty_page_for_writepage(wbc, page);
186 if (wbc->sync_mode == WB_SYNC_ALL) {
187 err = nilfs_construct_segment(inode->i_sb);
190 } else if (wbc->for_reclaim)
191 nilfs_flush_segment(inode->i_sb, inode->i_ino);
196 static int nilfs_set_page_dirty(struct page *page)
198 int ret = __set_page_dirty_buffers(page);
201 struct inode *inode = page->mapping->host;
202 unsigned nr_dirty = 1 << (PAGE_SHIFT - inode->i_blkbits);
204 nilfs_set_file_dirty(inode, nr_dirty);
209 static int nilfs_write_begin(struct file *file, struct address_space *mapping,
210 loff_t pos, unsigned len, unsigned flags,
211 struct page **pagep, void **fsdata)
214 struct inode *inode = mapping->host;
215 int err = nilfs_transaction_begin(inode->i_sb, NULL, 1);
220 err = block_write_begin(mapping, pos, len, flags, pagep,
223 loff_t isize = mapping->host->i_size;
224 if (pos + len > isize)
225 vmtruncate(mapping->host, isize);
227 nilfs_transaction_abort(inode->i_sb);
232 static int nilfs_write_end(struct file *file, struct address_space *mapping,
233 loff_t pos, unsigned len, unsigned copied,
234 struct page *page, void *fsdata)
236 struct inode *inode = mapping->host;
237 unsigned start = pos & (PAGE_CACHE_SIZE - 1);
241 nr_dirty = nilfs_page_count_clean_buffers(page, start,
243 copied = generic_write_end(file, mapping, pos, len, copied, page,
245 nilfs_set_file_dirty(inode, nr_dirty);
246 err = nilfs_transaction_commit(inode->i_sb);
247 return err ? : copied;
251 nilfs_direct_IO(int rw, struct kiocb *iocb, const struct iovec *iov,
252 loff_t offset, unsigned long nr_segs)
254 struct file *file = iocb->ki_filp;
255 struct inode *inode = file->f_mapping->host;
261 /* Needs synchronization with the cleaner */
262 size = blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov,
263 offset, nr_segs, nilfs_get_block, NULL);
266 * In case of error extending write may have instantiated a few
267 * blocks outside i_size. Trim these off again.
269 if (unlikely((rw & WRITE) && size < 0)) {
270 loff_t isize = i_size_read(inode);
271 loff_t end = offset + iov_length(iov, nr_segs);
274 vmtruncate(inode, isize);
280 const struct address_space_operations nilfs_aops = {
281 .writepage = nilfs_writepage,
282 .readpage = nilfs_readpage,
283 .sync_page = block_sync_page,
284 .writepages = nilfs_writepages,
285 .set_page_dirty = nilfs_set_page_dirty,
286 .readpages = nilfs_readpages,
287 .write_begin = nilfs_write_begin,
288 .write_end = nilfs_write_end,
289 /* .releasepage = nilfs_releasepage, */
290 .invalidatepage = block_invalidatepage,
291 .direct_IO = nilfs_direct_IO,
292 .is_partially_uptodate = block_is_partially_uptodate,
295 struct inode *nilfs_new_inode(struct inode *dir, int mode)
297 struct super_block *sb = dir->i_sb;
298 struct nilfs_sb_info *sbi = NILFS_SB(sb);
300 struct nilfs_inode_info *ii;
301 struct nilfs_root *root;
305 inode = new_inode(sb);
306 if (unlikely(!inode))
309 mapping_set_gfp_mask(inode->i_mapping,
310 mapping_gfp_mask(inode->i_mapping) & ~__GFP_FS);
312 root = NILFS_I(dir)->i_root;
314 ii->i_state = 1 << NILFS_I_NEW;
317 err = nilfs_ifile_create_inode(root->ifile, &ino, &ii->i_bh);
319 goto failed_ifile_create_inode;
320 /* reference count of i_bh inherits from nilfs_mdt_read_block() */
322 atomic_inc(&root->inodes_count);
323 inode_init_owner(inode, dir, mode);
325 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
327 if (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode)) {
328 err = nilfs_bmap_read(ii->i_bmap, NULL);
332 set_bit(NILFS_I_BMAP, &ii->i_state);
333 /* No lock is needed; iget() ensures it. */
336 ii->i_flags = nilfs_mask_flags(
337 mode, NILFS_I(dir)->i_flags & NILFS_FL_INHERITED);
339 /* ii->i_file_acl = 0; */
340 /* ii->i_dir_acl = 0; */
341 ii->i_dir_start_lookup = 0;
342 nilfs_set_inode_flags(inode);
343 spin_lock(&sbi->s_next_gen_lock);
344 inode->i_generation = sbi->s_next_generation++;
345 spin_unlock(&sbi->s_next_gen_lock);
346 insert_inode_hash(inode);
348 err = nilfs_init_acl(inode, dir);
350 goto failed_acl; /* never occur. When supporting
351 nilfs_init_acl(), proper cancellation of
352 above jobs should be considered */
359 iput(inode); /* raw_inode will be deleted through
360 generic_delete_inode() */
363 failed_ifile_create_inode:
364 make_bad_inode(inode);
365 iput(inode); /* if i_nlink == 1, generic_forget_inode() will be
371 void nilfs_set_inode_flags(struct inode *inode)
373 unsigned int flags = NILFS_I(inode)->i_flags;
375 inode->i_flags &= ~(S_SYNC | S_APPEND | S_IMMUTABLE | S_NOATIME |
377 if (flags & FS_SYNC_FL)
378 inode->i_flags |= S_SYNC;
379 if (flags & FS_APPEND_FL)
380 inode->i_flags |= S_APPEND;
381 if (flags & FS_IMMUTABLE_FL)
382 inode->i_flags |= S_IMMUTABLE;
383 if (flags & FS_NOATIME_FL)
384 inode->i_flags |= S_NOATIME;
385 if (flags & FS_DIRSYNC_FL)
386 inode->i_flags |= S_DIRSYNC;
387 mapping_set_gfp_mask(inode->i_mapping,
388 mapping_gfp_mask(inode->i_mapping) & ~__GFP_FS);
391 int nilfs_read_inode_common(struct inode *inode,
392 struct nilfs_inode *raw_inode)
394 struct nilfs_inode_info *ii = NILFS_I(inode);
397 inode->i_mode = le16_to_cpu(raw_inode->i_mode);
398 inode->i_uid = (uid_t)le32_to_cpu(raw_inode->i_uid);
399 inode->i_gid = (gid_t)le32_to_cpu(raw_inode->i_gid);
400 inode->i_nlink = le16_to_cpu(raw_inode->i_links_count);
401 inode->i_size = le64_to_cpu(raw_inode->i_size);
402 inode->i_atime.tv_sec = le64_to_cpu(raw_inode->i_mtime);
403 inode->i_ctime.tv_sec = le64_to_cpu(raw_inode->i_ctime);
404 inode->i_mtime.tv_sec = le64_to_cpu(raw_inode->i_mtime);
405 inode->i_atime.tv_nsec = le32_to_cpu(raw_inode->i_mtime_nsec);
406 inode->i_ctime.tv_nsec = le32_to_cpu(raw_inode->i_ctime_nsec);
407 inode->i_mtime.tv_nsec = le32_to_cpu(raw_inode->i_mtime_nsec);
408 if (inode->i_nlink == 0 && inode->i_mode == 0)
409 return -EINVAL; /* this inode is deleted */
411 inode->i_blocks = le64_to_cpu(raw_inode->i_blocks);
412 ii->i_flags = le32_to_cpu(raw_inode->i_flags);
414 ii->i_file_acl = le32_to_cpu(raw_inode->i_file_acl);
415 ii->i_dir_acl = S_ISREG(inode->i_mode) ?
416 0 : le32_to_cpu(raw_inode->i_dir_acl);
418 ii->i_dir_start_lookup = 0;
419 inode->i_generation = le32_to_cpu(raw_inode->i_generation);
421 if (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
422 S_ISLNK(inode->i_mode)) {
423 err = nilfs_bmap_read(ii->i_bmap, raw_inode);
426 set_bit(NILFS_I_BMAP, &ii->i_state);
427 /* No lock is needed; iget() ensures it. */
432 static int __nilfs_read_inode(struct super_block *sb,
433 struct nilfs_root *root, unsigned long ino,
436 struct the_nilfs *nilfs = NILFS_SB(sb)->s_nilfs;
437 struct buffer_head *bh;
438 struct nilfs_inode *raw_inode;
441 down_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem);
442 err = nilfs_ifile_get_inode_block(root->ifile, ino, &bh);
446 raw_inode = nilfs_ifile_map_inode(root->ifile, ino, bh);
448 err = nilfs_read_inode_common(inode, raw_inode);
452 if (S_ISREG(inode->i_mode)) {
453 inode->i_op = &nilfs_file_inode_operations;
454 inode->i_fop = &nilfs_file_operations;
455 inode->i_mapping->a_ops = &nilfs_aops;
456 } else if (S_ISDIR(inode->i_mode)) {
457 inode->i_op = &nilfs_dir_inode_operations;
458 inode->i_fop = &nilfs_dir_operations;
459 inode->i_mapping->a_ops = &nilfs_aops;
460 } else if (S_ISLNK(inode->i_mode)) {
461 inode->i_op = &nilfs_symlink_inode_operations;
462 inode->i_mapping->a_ops = &nilfs_aops;
464 inode->i_op = &nilfs_special_inode_operations;
466 inode, inode->i_mode,
467 huge_decode_dev(le64_to_cpu(raw_inode->i_device_code)));
469 nilfs_ifile_unmap_inode(root->ifile, ino, bh);
471 up_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem);
472 nilfs_set_inode_flags(inode);
476 nilfs_ifile_unmap_inode(root->ifile, ino, bh);
480 up_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem);
484 static int nilfs_iget_test(struct inode *inode, void *opaque)
486 struct nilfs_iget_args *args = opaque;
487 struct nilfs_inode_info *ii;
489 if (args->ino != inode->i_ino || args->root != NILFS_I(inode)->i_root)
493 if (!test_bit(NILFS_I_GCINODE, &ii->i_state))
494 return !args->for_gc;
496 return args->for_gc && args->cno == ii->i_cno;
499 static int nilfs_iget_set(struct inode *inode, void *opaque)
501 struct nilfs_iget_args *args = opaque;
503 inode->i_ino = args->ino;
505 NILFS_I(inode)->i_state = 1 << NILFS_I_GCINODE;
506 NILFS_I(inode)->i_cno = args->cno;
507 NILFS_I(inode)->i_root = NULL;
509 if (args->root && args->ino == NILFS_ROOT_INO)
510 nilfs_get_root(args->root);
511 NILFS_I(inode)->i_root = args->root;
516 struct inode *nilfs_ilookup(struct super_block *sb, struct nilfs_root *root,
519 struct nilfs_iget_args args = {
520 .ino = ino, .root = root, .cno = 0, .for_gc = 0
523 return ilookup5(sb, ino, nilfs_iget_test, &args);
526 struct inode *nilfs_iget_locked(struct super_block *sb, struct nilfs_root *root,
529 struct nilfs_iget_args args = {
530 .ino = ino, .root = root, .cno = 0, .for_gc = 0
533 return iget5_locked(sb, ino, nilfs_iget_test, nilfs_iget_set, &args);
536 struct inode *nilfs_iget(struct super_block *sb, struct nilfs_root *root,
542 inode = nilfs_iget_locked(sb, root, ino);
543 if (unlikely(!inode))
544 return ERR_PTR(-ENOMEM);
545 if (!(inode->i_state & I_NEW))
548 err = __nilfs_read_inode(sb, root, ino, inode);
553 unlock_new_inode(inode);
557 struct inode *nilfs_iget_for_gc(struct super_block *sb, unsigned long ino,
560 struct nilfs_iget_args args = {
561 .ino = ino, .root = NULL, .cno = cno, .for_gc = 1
566 inode = iget5_locked(sb, ino, nilfs_iget_test, nilfs_iget_set, &args);
567 if (unlikely(!inode))
568 return ERR_PTR(-ENOMEM);
569 if (!(inode->i_state & I_NEW))
572 err = nilfs_init_gcinode(inode);
577 unlock_new_inode(inode);
581 void nilfs_write_inode_common(struct inode *inode,
582 struct nilfs_inode *raw_inode, int has_bmap)
584 struct nilfs_inode_info *ii = NILFS_I(inode);
586 raw_inode->i_mode = cpu_to_le16(inode->i_mode);
587 raw_inode->i_uid = cpu_to_le32(inode->i_uid);
588 raw_inode->i_gid = cpu_to_le32(inode->i_gid);
589 raw_inode->i_links_count = cpu_to_le16(inode->i_nlink);
590 raw_inode->i_size = cpu_to_le64(inode->i_size);
591 raw_inode->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec);
592 raw_inode->i_mtime = cpu_to_le64(inode->i_mtime.tv_sec);
593 raw_inode->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
594 raw_inode->i_mtime_nsec = cpu_to_le32(inode->i_mtime.tv_nsec);
595 raw_inode->i_blocks = cpu_to_le64(inode->i_blocks);
597 raw_inode->i_flags = cpu_to_le32(ii->i_flags);
598 raw_inode->i_generation = cpu_to_le32(inode->i_generation);
601 nilfs_bmap_write(ii->i_bmap, raw_inode);
602 else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
603 raw_inode->i_device_code =
604 cpu_to_le64(huge_encode_dev(inode->i_rdev));
605 /* When extending inode, nilfs->ns_inode_size should be checked
606 for substitutions of appended fields */
609 void nilfs_update_inode(struct inode *inode, struct buffer_head *ibh)
611 ino_t ino = inode->i_ino;
612 struct nilfs_inode_info *ii = NILFS_I(inode);
613 struct inode *ifile = ii->i_root->ifile;
614 struct nilfs_inode *raw_inode;
616 raw_inode = nilfs_ifile_map_inode(ifile, ino, ibh);
618 if (test_and_clear_bit(NILFS_I_NEW, &ii->i_state))
619 memset(raw_inode, 0, NILFS_MDT(ifile)->mi_entry_size);
620 set_bit(NILFS_I_INODE_DIRTY, &ii->i_state);
622 nilfs_write_inode_common(inode, raw_inode, 0);
623 /* XXX: call with has_bmap = 0 is a workaround to avoid
624 deadlock of bmap. This delays update of i_bmap to just
626 nilfs_ifile_unmap_inode(ifile, ino, ibh);
629 #define NILFS_MAX_TRUNCATE_BLOCKS 16384 /* 64MB for 4KB block */
631 static void nilfs_truncate_bmap(struct nilfs_inode_info *ii,
637 if (!test_bit(NILFS_I_BMAP, &ii->i_state))
640 ret = nilfs_bmap_last_key(ii->i_bmap, &b);
649 b -= min_t(unsigned long, NILFS_MAX_TRUNCATE_BLOCKS, b - from);
650 ret = nilfs_bmap_truncate(ii->i_bmap, b);
651 nilfs_relax_pressure_in_lock(ii->vfs_inode.i_sb);
652 if (!ret || (ret == -ENOMEM &&
653 nilfs_bmap_truncate(ii->i_bmap, b) == 0))
657 nilfs_warning(ii->vfs_inode.i_sb, __func__,
658 "failed to truncate bmap (ino=%lu, err=%d)",
659 ii->vfs_inode.i_ino, ret);
662 void nilfs_truncate(struct inode *inode)
664 unsigned long blkoff;
665 unsigned int blocksize;
666 struct nilfs_transaction_info ti;
667 struct super_block *sb = inode->i_sb;
668 struct nilfs_inode_info *ii = NILFS_I(inode);
670 if (!test_bit(NILFS_I_BMAP, &ii->i_state))
672 if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
675 blocksize = sb->s_blocksize;
676 blkoff = (inode->i_size + blocksize - 1) >> sb->s_blocksize_bits;
677 nilfs_transaction_begin(sb, &ti, 0); /* never fails */
679 block_truncate_page(inode->i_mapping, inode->i_size, nilfs_get_block);
681 nilfs_truncate_bmap(ii, blkoff);
683 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
685 nilfs_set_transaction_flag(NILFS_TI_SYNC);
687 nilfs_mark_inode_dirty(inode);
688 nilfs_set_file_dirty(inode, 0);
689 nilfs_transaction_commit(sb);
690 /* May construct a logical segment and may fail in sync mode.
691 But truncate has no return value. */
694 static void nilfs_clear_inode(struct inode *inode)
696 struct nilfs_inode_info *ii = NILFS_I(inode);
697 struct nilfs_mdt_info *mdi = NILFS_MDT(inode);
700 * Free resources allocated in nilfs_read_inode(), here.
702 BUG_ON(!list_empty(&ii->i_dirty));
706 if (mdi && mdi->mi_palloc_cache)
707 nilfs_palloc_destroy_cache(inode);
709 if (test_bit(NILFS_I_BMAP, &ii->i_state))
710 nilfs_bmap_clear(ii->i_bmap);
712 nilfs_btnode_cache_clear(&ii->i_btnode_cache);
714 if (ii->i_root && inode->i_ino == NILFS_ROOT_INO)
715 nilfs_put_root(ii->i_root);
718 void nilfs_evict_inode(struct inode *inode)
720 struct nilfs_transaction_info ti;
721 struct super_block *sb = inode->i_sb;
722 struct nilfs_inode_info *ii = NILFS_I(inode);
725 if (inode->i_nlink || !ii->i_root || unlikely(is_bad_inode(inode))) {
726 if (inode->i_data.nrpages)
727 truncate_inode_pages(&inode->i_data, 0);
728 end_writeback(inode);
729 nilfs_clear_inode(inode);
732 nilfs_transaction_begin(sb, &ti, 0); /* never fails */
734 if (inode->i_data.nrpages)
735 truncate_inode_pages(&inode->i_data, 0);
737 /* TODO: some of the following operations may fail. */
738 nilfs_truncate_bmap(ii, 0);
739 nilfs_mark_inode_dirty(inode);
740 end_writeback(inode);
742 ret = nilfs_ifile_delete_inode(ii->i_root->ifile, inode->i_ino);
744 atomic_dec(&ii->i_root->inodes_count);
746 nilfs_clear_inode(inode);
749 nilfs_set_transaction_flag(NILFS_TI_SYNC);
750 nilfs_transaction_commit(sb);
751 /* May construct a logical segment and may fail in sync mode.
752 But delete_inode has no return value. */
755 int nilfs_setattr(struct dentry *dentry, struct iattr *iattr)
757 struct nilfs_transaction_info ti;
758 struct inode *inode = dentry->d_inode;
759 struct super_block *sb = inode->i_sb;
762 err = inode_change_ok(inode, iattr);
766 err = nilfs_transaction_begin(sb, &ti, 0);
770 if ((iattr->ia_valid & ATTR_SIZE) &&
771 iattr->ia_size != i_size_read(inode)) {
772 err = vmtruncate(inode, iattr->ia_size);
777 setattr_copy(inode, iattr);
778 mark_inode_dirty(inode);
780 if (iattr->ia_valid & ATTR_MODE) {
781 err = nilfs_acl_chmod(inode);
786 return nilfs_transaction_commit(sb);
789 nilfs_transaction_abort(sb);
793 int nilfs_permission(struct inode *inode, int mask, unsigned int flags)
795 struct nilfs_root *root;
797 if (flags & IPERM_FLAG_RCU)
800 root = NILFS_I(inode)->i_root;
801 if ((mask & MAY_WRITE) && root &&
802 root->cno != NILFS_CPTREE_CURRENT_CNO)
803 return -EROFS; /* snapshot is not writable */
805 return generic_permission(inode, mask, flags, NULL);
808 int nilfs_load_inode_block(struct inode *inode, struct buffer_head **pbh)
810 struct nilfs_sb_info *sbi = NILFS_SB(inode->i_sb);
811 struct nilfs_inode_info *ii = NILFS_I(inode);
814 spin_lock(&sbi->s_inode_lock);
815 if (ii->i_bh == NULL) {
816 spin_unlock(&sbi->s_inode_lock);
817 err = nilfs_ifile_get_inode_block(ii->i_root->ifile,
821 spin_lock(&sbi->s_inode_lock);
822 if (ii->i_bh == NULL)
832 spin_unlock(&sbi->s_inode_lock);
836 int nilfs_inode_dirty(struct inode *inode)
838 struct nilfs_inode_info *ii = NILFS_I(inode);
839 struct nilfs_sb_info *sbi = NILFS_SB(inode->i_sb);
842 if (!list_empty(&ii->i_dirty)) {
843 spin_lock(&sbi->s_inode_lock);
844 ret = test_bit(NILFS_I_DIRTY, &ii->i_state) ||
845 test_bit(NILFS_I_BUSY, &ii->i_state);
846 spin_unlock(&sbi->s_inode_lock);
851 int nilfs_set_file_dirty(struct inode *inode, unsigned nr_dirty)
853 struct nilfs_sb_info *sbi = NILFS_SB(inode->i_sb);
854 struct nilfs_inode_info *ii = NILFS_I(inode);
856 atomic_add(nr_dirty, &sbi->s_nilfs->ns_ndirtyblks);
858 if (test_and_set_bit(NILFS_I_DIRTY, &ii->i_state))
861 spin_lock(&sbi->s_inode_lock);
862 if (!test_bit(NILFS_I_QUEUED, &ii->i_state) &&
863 !test_bit(NILFS_I_BUSY, &ii->i_state)) {
864 /* Because this routine may race with nilfs_dispose_list(),
865 we have to check NILFS_I_QUEUED here, too. */
866 if (list_empty(&ii->i_dirty) && igrab(inode) == NULL) {
867 /* This will happen when somebody is freeing
869 nilfs_warning(sbi->s_super, __func__,
870 "cannot get inode (ino=%lu)\n",
872 spin_unlock(&sbi->s_inode_lock);
873 return -EINVAL; /* NILFS_I_DIRTY may remain for
876 list_del(&ii->i_dirty);
877 list_add_tail(&ii->i_dirty, &sbi->s_dirty_files);
878 set_bit(NILFS_I_QUEUED, &ii->i_state);
880 spin_unlock(&sbi->s_inode_lock);
884 int nilfs_mark_inode_dirty(struct inode *inode)
886 struct buffer_head *ibh;
889 err = nilfs_load_inode_block(inode, &ibh);
891 nilfs_warning(inode->i_sb, __func__,
892 "failed to reget inode block.\n");
895 nilfs_update_inode(inode, ibh);
896 nilfs_mdt_mark_buffer_dirty(ibh);
897 nilfs_mdt_mark_dirty(NILFS_I(inode)->i_root->ifile);
903 * nilfs_dirty_inode - reflect changes on given inode to an inode block.
904 * @inode: inode of the file to be registered.
906 * nilfs_dirty_inode() loads a inode block containing the specified
907 * @inode and copies data from a nilfs_inode to a corresponding inode
908 * entry in the inode block. This operation is excluded from the segment
909 * construction. This function can be called both as a single operation
910 * and as a part of indivisible file operations.
912 void nilfs_dirty_inode(struct inode *inode)
914 struct nilfs_transaction_info ti;
915 struct nilfs_mdt_info *mdi = NILFS_MDT(inode);
917 if (is_bad_inode(inode)) {
918 nilfs_warning(inode->i_sb, __func__,
919 "tried to mark bad_inode dirty. ignored.\n");
924 nilfs_mdt_mark_dirty(inode);
927 nilfs_transaction_begin(inode->i_sb, &ti, 0);
928 nilfs_mark_inode_dirty(inode);
929 nilfs_transaction_commit(inode->i_sb); /* never fails */
932 int nilfs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
933 __u64 start, __u64 len)
935 struct the_nilfs *nilfs = NILFS_I_NILFS(inode);
936 __u64 logical = 0, phys = 0, size = 0;
939 sector_t blkoff, end_blkoff;
940 sector_t delalloc_blkoff;
941 unsigned long delalloc_blklen;
942 unsigned int blkbits = inode->i_blkbits;
945 ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC);
949 mutex_lock(&inode->i_mutex);
951 isize = i_size_read(inode);
953 blkoff = start >> blkbits;
954 end_blkoff = (start + len - 1) >> blkbits;
956 delalloc_blklen = nilfs_find_uncommitted_extent(inode, blkoff,
961 unsigned int maxblocks;
963 if (delalloc_blklen && blkoff == delalloc_blkoff) {
965 /* End of the current extent */
966 ret = fiemap_fill_next_extent(
967 fieinfo, logical, phys, size, flags);
971 if (blkoff > end_blkoff)
974 flags = FIEMAP_EXTENT_MERGED | FIEMAP_EXTENT_DELALLOC;
975 logical = blkoff << blkbits;
977 size = delalloc_blklen << blkbits;
979 blkoff = delalloc_blkoff + delalloc_blklen;
980 delalloc_blklen = nilfs_find_uncommitted_extent(
981 inode, blkoff, &delalloc_blkoff);
986 * Limit the number of blocks that we look up so as
987 * not to get into the next delayed allocation extent.
991 maxblocks = min_t(sector_t, delalloc_blkoff - blkoff,
995 down_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem);
996 n = nilfs_bmap_lookup_contig(
997 NILFS_I(inode)->i_bmap, blkoff, &blkphy, maxblocks);
998 up_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem);
1003 if (unlikely(n != -ENOENT))
1008 past_eof = ((blkoff << blkbits) >= isize);
1011 /* End of the current extent */
1014 flags |= FIEMAP_EXTENT_LAST;
1016 ret = fiemap_fill_next_extent(
1017 fieinfo, logical, phys, size, flags);
1022 if (blkoff > end_blkoff || past_eof)
1026 if (phys && blkphy << blkbits == phys + size) {
1027 /* The current extent goes on */
1028 size += n << blkbits;
1030 /* Terminate the current extent */
1031 ret = fiemap_fill_next_extent(
1032 fieinfo, logical, phys, size,
1034 if (ret || blkoff > end_blkoff)
1037 /* Start another extent */
1038 flags = FIEMAP_EXTENT_MERGED;
1039 logical = blkoff << blkbits;
1040 phys = blkphy << blkbits;
1041 size = n << blkbits;
1044 /* Start a new extent */
1045 flags = FIEMAP_EXTENT_MERGED;
1046 logical = blkoff << blkbits;
1047 phys = blkphy << blkbits;
1048 size = n << blkbits;
1055 /* If ret is 1 then we just hit the end of the extent array */
1059 mutex_unlock(&inode->i_mutex);