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_I_NILFS(inode)->ns_dat;
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);
100 nilfs_transaction_abort(inode->i_sb);
103 nilfs_mark_inode_dirty(inode);
104 nilfs_transaction_commit(inode->i_sb); /* never fails */
105 /* Error handling should be detailed */
106 set_buffer_new(bh_result);
107 set_buffer_delay(bh_result);
108 map_bh(bh_result, inode->i_sb, 0); /* dbn must be changed
110 } else if (ret == -ENOENT) {
111 /* not found is not error (e.g. hole); must return without
112 the mapped state flag. */
123 * nilfs_readpage() - implement readpage() method of nilfs_aops {}
124 * address_space_operations.
125 * @file - file struct of the file to be read
126 * @page - the page to be read
128 static int nilfs_readpage(struct file *file, struct page *page)
130 return mpage_readpage(page, nilfs_get_block);
134 * nilfs_readpages() - implement readpages() method of nilfs_aops {}
135 * address_space_operations.
136 * @file - file struct of the file to be read
137 * @mapping - address_space struct used for reading multiple pages
138 * @pages - the pages to be read
139 * @nr_pages - number of pages to be read
141 static int nilfs_readpages(struct file *file, struct address_space *mapping,
142 struct list_head *pages, unsigned nr_pages)
144 return mpage_readpages(mapping, pages, nr_pages, nilfs_get_block);
147 static int nilfs_writepages(struct address_space *mapping,
148 struct writeback_control *wbc)
150 struct inode *inode = mapping->host;
153 if (wbc->sync_mode == WB_SYNC_ALL)
154 err = nilfs_construct_dsync_segment(inode->i_sb, inode,
160 static int nilfs_writepage(struct page *page, struct writeback_control *wbc)
162 struct inode *inode = page->mapping->host;
165 redirty_page_for_writepage(wbc, page);
168 if (wbc->sync_mode == WB_SYNC_ALL) {
169 err = nilfs_construct_segment(inode->i_sb);
172 } else if (wbc->for_reclaim)
173 nilfs_flush_segment(inode->i_sb, inode->i_ino);
178 static int nilfs_set_page_dirty(struct page *page)
180 int ret = __set_page_dirty_buffers(page);
183 struct inode *inode = page->mapping->host;
184 unsigned nr_dirty = 1 << (PAGE_SHIFT - inode->i_blkbits);
186 nilfs_set_file_dirty(inode, nr_dirty);
191 static int nilfs_write_begin(struct file *file, struct address_space *mapping,
192 loff_t pos, unsigned len, unsigned flags,
193 struct page **pagep, void **fsdata)
196 struct inode *inode = mapping->host;
197 int err = nilfs_transaction_begin(inode->i_sb, NULL, 1);
202 err = block_write_begin(mapping, pos, len, flags, pagep,
205 loff_t isize = mapping->host->i_size;
206 if (pos + len > isize)
207 vmtruncate(mapping->host, isize);
209 nilfs_transaction_abort(inode->i_sb);
214 static int nilfs_write_end(struct file *file, struct address_space *mapping,
215 loff_t pos, unsigned len, unsigned copied,
216 struct page *page, void *fsdata)
218 struct inode *inode = mapping->host;
219 unsigned start = pos & (PAGE_CACHE_SIZE - 1);
223 nr_dirty = nilfs_page_count_clean_buffers(page, start,
225 copied = generic_write_end(file, mapping, pos, len, copied, page,
227 nilfs_set_file_dirty(inode, nr_dirty);
228 err = nilfs_transaction_commit(inode->i_sb);
229 return err ? : copied;
233 nilfs_direct_IO(int rw, struct kiocb *iocb, const struct iovec *iov,
234 loff_t offset, unsigned long nr_segs)
236 struct file *file = iocb->ki_filp;
237 struct inode *inode = file->f_mapping->host;
243 /* Needs synchronization with the cleaner */
244 size = blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov,
245 offset, nr_segs, nilfs_get_block, NULL);
248 * In case of error extending write may have instantiated a few
249 * blocks outside i_size. Trim these off again.
251 if (unlikely((rw & WRITE) && size < 0)) {
252 loff_t isize = i_size_read(inode);
253 loff_t end = offset + iov_length(iov, nr_segs);
256 vmtruncate(inode, isize);
262 const struct address_space_operations nilfs_aops = {
263 .writepage = nilfs_writepage,
264 .readpage = nilfs_readpage,
265 .sync_page = block_sync_page,
266 .writepages = nilfs_writepages,
267 .set_page_dirty = nilfs_set_page_dirty,
268 .readpages = nilfs_readpages,
269 .write_begin = nilfs_write_begin,
270 .write_end = nilfs_write_end,
271 /* .releasepage = nilfs_releasepage, */
272 .invalidatepage = block_invalidatepage,
273 .direct_IO = nilfs_direct_IO,
274 .is_partially_uptodate = block_is_partially_uptodate,
277 struct inode *nilfs_new_inode(struct inode *dir, int mode)
279 struct super_block *sb = dir->i_sb;
280 struct nilfs_sb_info *sbi = NILFS_SB(sb);
282 struct nilfs_inode_info *ii;
283 struct nilfs_root *root;
287 inode = new_inode(sb);
288 if (unlikely(!inode))
291 mapping_set_gfp_mask(inode->i_mapping,
292 mapping_gfp_mask(inode->i_mapping) & ~__GFP_FS);
294 root = NILFS_I(dir)->i_root;
296 ii->i_state = 1 << NILFS_I_NEW;
299 err = nilfs_ifile_create_inode(root->ifile, &ino, &ii->i_bh);
301 goto failed_ifile_create_inode;
302 /* reference count of i_bh inherits from nilfs_mdt_read_block() */
304 atomic_inc(&root->inodes_count);
305 inode_init_owner(inode, dir, mode);
307 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
309 if (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode)) {
310 err = nilfs_bmap_read(ii->i_bmap, NULL);
314 set_bit(NILFS_I_BMAP, &ii->i_state);
315 /* No lock is needed; iget() ensures it. */
318 ii->i_flags = NILFS_I(dir)->i_flags;
320 ii->i_flags &= ~(NILFS_IMMUTABLE_FL | NILFS_APPEND_FL);
322 ii->i_flags &= ~NILFS_DIRSYNC_FL;
324 /* ii->i_file_acl = 0; */
325 /* ii->i_dir_acl = 0; */
326 ii->i_dir_start_lookup = 0;
327 nilfs_set_inode_flags(inode);
328 spin_lock(&sbi->s_next_gen_lock);
329 inode->i_generation = sbi->s_next_generation++;
330 spin_unlock(&sbi->s_next_gen_lock);
331 insert_inode_hash(inode);
333 err = nilfs_init_acl(inode, dir);
335 goto failed_acl; /* never occur. When supporting
336 nilfs_init_acl(), proper cancellation of
337 above jobs should be considered */
344 iput(inode); /* raw_inode will be deleted through
345 generic_delete_inode() */
348 failed_ifile_create_inode:
349 make_bad_inode(inode);
350 iput(inode); /* if i_nlink == 1, generic_forget_inode() will be
356 void nilfs_set_inode_flags(struct inode *inode)
358 unsigned int flags = NILFS_I(inode)->i_flags;
360 inode->i_flags &= ~(S_SYNC | S_APPEND | S_IMMUTABLE | S_NOATIME |
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)
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);
378 int nilfs_read_inode_common(struct inode *inode,
379 struct nilfs_inode *raw_inode)
381 struct nilfs_inode_info *ii = NILFS_I(inode);
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 */
398 inode->i_blocks = le64_to_cpu(raw_inode->i_blocks);
399 ii->i_flags = le32_to_cpu(raw_inode->i_flags);
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);
405 ii->i_dir_start_lookup = 0;
406 inode->i_generation = le32_to_cpu(raw_inode->i_generation);
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);
413 set_bit(NILFS_I_BMAP, &ii->i_state);
414 /* No lock is needed; iget() ensures it. */
419 static int __nilfs_read_inode(struct super_block *sb,
420 struct nilfs_root *root, unsigned long ino,
423 struct the_nilfs *nilfs = NILFS_SB(sb)->s_nilfs;
424 struct buffer_head *bh;
425 struct nilfs_inode *raw_inode;
428 down_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem);
429 err = nilfs_ifile_get_inode_block(root->ifile, ino, &bh);
433 raw_inode = nilfs_ifile_map_inode(root->ifile, ino, bh);
435 err = nilfs_read_inode_common(inode, raw_inode);
439 if (S_ISREG(inode->i_mode)) {
440 inode->i_op = &nilfs_file_inode_operations;
441 inode->i_fop = &nilfs_file_operations;
442 inode->i_mapping->a_ops = &nilfs_aops;
443 } else if (S_ISDIR(inode->i_mode)) {
444 inode->i_op = &nilfs_dir_inode_operations;
445 inode->i_fop = &nilfs_dir_operations;
446 inode->i_mapping->a_ops = &nilfs_aops;
447 } else if (S_ISLNK(inode->i_mode)) {
448 inode->i_op = &nilfs_symlink_inode_operations;
449 inode->i_mapping->a_ops = &nilfs_aops;
451 inode->i_op = &nilfs_special_inode_operations;
453 inode, inode->i_mode,
454 huge_decode_dev(le64_to_cpu(raw_inode->i_device_code)));
456 nilfs_ifile_unmap_inode(root->ifile, ino, bh);
458 up_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem);
459 nilfs_set_inode_flags(inode);
463 nilfs_ifile_unmap_inode(root->ifile, ino, bh);
467 up_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem);
471 static int nilfs_iget_test(struct inode *inode, void *opaque)
473 struct nilfs_iget_args *args = opaque;
474 struct nilfs_inode_info *ii;
476 if (args->ino != inode->i_ino || args->root != NILFS_I(inode)->i_root)
480 if (!test_bit(NILFS_I_GCINODE, &ii->i_state))
481 return !args->for_gc;
483 return args->for_gc && args->cno == ii->i_cno;
486 static int nilfs_iget_set(struct inode *inode, void *opaque)
488 struct nilfs_iget_args *args = opaque;
490 inode->i_ino = args->ino;
492 NILFS_I(inode)->i_state = 1 << NILFS_I_GCINODE;
493 NILFS_I(inode)->i_cno = args->cno;
494 NILFS_I(inode)->i_root = NULL;
496 if (args->root && args->ino == NILFS_ROOT_INO)
497 nilfs_get_root(args->root);
498 NILFS_I(inode)->i_root = args->root;
503 struct inode *nilfs_ilookup(struct super_block *sb, struct nilfs_root *root,
506 struct nilfs_iget_args args = {
507 .ino = ino, .root = root, .cno = 0, .for_gc = 0
510 return ilookup5(sb, ino, nilfs_iget_test, &args);
513 struct inode *nilfs_iget_locked(struct super_block *sb, struct nilfs_root *root,
516 struct nilfs_iget_args args = {
517 .ino = ino, .root = root, .cno = 0, .for_gc = 0
520 return iget5_locked(sb, ino, nilfs_iget_test, nilfs_iget_set, &args);
523 struct inode *nilfs_iget(struct super_block *sb, struct nilfs_root *root,
529 inode = nilfs_iget_locked(sb, root, ino);
530 if (unlikely(!inode))
531 return ERR_PTR(-ENOMEM);
532 if (!(inode->i_state & I_NEW))
535 err = __nilfs_read_inode(sb, root, ino, inode);
540 unlock_new_inode(inode);
544 struct inode *nilfs_iget_for_gc(struct super_block *sb, unsigned long ino,
547 struct nilfs_iget_args args = {
548 .ino = ino, .root = NULL, .cno = cno, .for_gc = 1
553 inode = iget5_locked(sb, ino, nilfs_iget_test, nilfs_iget_set, &args);
554 if (unlikely(!inode))
555 return ERR_PTR(-ENOMEM);
556 if (!(inode->i_state & I_NEW))
559 err = nilfs_init_gcinode(inode);
564 unlock_new_inode(inode);
568 void nilfs_write_inode_common(struct inode *inode,
569 struct nilfs_inode *raw_inode, int has_bmap)
571 struct nilfs_inode_info *ii = NILFS_I(inode);
573 raw_inode->i_mode = cpu_to_le16(inode->i_mode);
574 raw_inode->i_uid = cpu_to_le32(inode->i_uid);
575 raw_inode->i_gid = cpu_to_le32(inode->i_gid);
576 raw_inode->i_links_count = cpu_to_le16(inode->i_nlink);
577 raw_inode->i_size = cpu_to_le64(inode->i_size);
578 raw_inode->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec);
579 raw_inode->i_mtime = cpu_to_le64(inode->i_mtime.tv_sec);
580 raw_inode->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
581 raw_inode->i_mtime_nsec = cpu_to_le32(inode->i_mtime.tv_nsec);
582 raw_inode->i_blocks = cpu_to_le64(inode->i_blocks);
584 raw_inode->i_flags = cpu_to_le32(ii->i_flags);
585 raw_inode->i_generation = cpu_to_le32(inode->i_generation);
588 nilfs_bmap_write(ii->i_bmap, raw_inode);
589 else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
590 raw_inode->i_device_code =
591 cpu_to_le64(huge_encode_dev(inode->i_rdev));
592 /* When extending inode, nilfs->ns_inode_size should be checked
593 for substitutions of appended fields */
596 void nilfs_update_inode(struct inode *inode, struct buffer_head *ibh)
598 ino_t ino = inode->i_ino;
599 struct nilfs_inode_info *ii = NILFS_I(inode);
600 struct inode *ifile = ii->i_root->ifile;
601 struct nilfs_inode *raw_inode;
603 raw_inode = nilfs_ifile_map_inode(ifile, ino, ibh);
605 if (test_and_clear_bit(NILFS_I_NEW, &ii->i_state))
606 memset(raw_inode, 0, NILFS_MDT(ifile)->mi_entry_size);
607 set_bit(NILFS_I_INODE_DIRTY, &ii->i_state);
609 nilfs_write_inode_common(inode, raw_inode, 0);
610 /* XXX: call with has_bmap = 0 is a workaround to avoid
611 deadlock of bmap. This delays update of i_bmap to just
613 nilfs_ifile_unmap_inode(ifile, ino, ibh);
616 #define NILFS_MAX_TRUNCATE_BLOCKS 16384 /* 64MB for 4KB block */
618 static void nilfs_truncate_bmap(struct nilfs_inode_info *ii,
624 if (!test_bit(NILFS_I_BMAP, &ii->i_state))
627 ret = nilfs_bmap_last_key(ii->i_bmap, &b);
636 b -= min_t(unsigned long, NILFS_MAX_TRUNCATE_BLOCKS, b - from);
637 ret = nilfs_bmap_truncate(ii->i_bmap, b);
638 nilfs_relax_pressure_in_lock(ii->vfs_inode.i_sb);
639 if (!ret || (ret == -ENOMEM &&
640 nilfs_bmap_truncate(ii->i_bmap, b) == 0))
644 nilfs_warning(ii->vfs_inode.i_sb, __func__,
645 "failed to truncate bmap (ino=%lu, err=%d)",
646 ii->vfs_inode.i_ino, ret);
649 void nilfs_truncate(struct inode *inode)
651 unsigned long blkoff;
652 unsigned int blocksize;
653 struct nilfs_transaction_info ti;
654 struct super_block *sb = inode->i_sb;
655 struct nilfs_inode_info *ii = NILFS_I(inode);
657 if (!test_bit(NILFS_I_BMAP, &ii->i_state))
659 if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
662 blocksize = sb->s_blocksize;
663 blkoff = (inode->i_size + blocksize - 1) >> sb->s_blocksize_bits;
664 nilfs_transaction_begin(sb, &ti, 0); /* never fails */
666 block_truncate_page(inode->i_mapping, inode->i_size, nilfs_get_block);
668 nilfs_truncate_bmap(ii, blkoff);
670 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
672 nilfs_set_transaction_flag(NILFS_TI_SYNC);
674 nilfs_mark_inode_dirty(inode);
675 nilfs_set_file_dirty(inode, 0);
676 nilfs_transaction_commit(sb);
677 /* May construct a logical segment and may fail in sync mode.
678 But truncate has no return value. */
681 static void nilfs_clear_inode(struct inode *inode)
683 struct nilfs_inode_info *ii = NILFS_I(inode);
684 struct nilfs_mdt_info *mdi = NILFS_MDT(inode);
687 * Free resources allocated in nilfs_read_inode(), here.
689 BUG_ON(!list_empty(&ii->i_dirty));
693 if (mdi && mdi->mi_palloc_cache)
694 nilfs_palloc_destroy_cache(inode);
696 if (test_bit(NILFS_I_BMAP, &ii->i_state))
697 nilfs_bmap_clear(ii->i_bmap);
699 nilfs_btnode_cache_clear(&ii->i_btnode_cache);
701 if (ii->i_root && inode->i_ino == NILFS_ROOT_INO)
702 nilfs_put_root(ii->i_root);
705 void nilfs_evict_inode(struct inode *inode)
707 struct nilfs_transaction_info ti;
708 struct super_block *sb = inode->i_sb;
709 struct nilfs_inode_info *ii = NILFS_I(inode);
711 if (inode->i_nlink || !ii->i_root || unlikely(is_bad_inode(inode))) {
712 if (inode->i_data.nrpages)
713 truncate_inode_pages(&inode->i_data, 0);
714 end_writeback(inode);
715 nilfs_clear_inode(inode);
718 nilfs_transaction_begin(sb, &ti, 0); /* never fails */
720 if (inode->i_data.nrpages)
721 truncate_inode_pages(&inode->i_data, 0);
723 /* TODO: some of the following operations may fail. */
724 nilfs_truncate_bmap(ii, 0);
725 nilfs_mark_inode_dirty(inode);
726 end_writeback(inode);
728 nilfs_ifile_delete_inode(ii->i_root->ifile, inode->i_ino);
729 atomic_dec(&ii->i_root->inodes_count);
731 nilfs_clear_inode(inode);
734 nilfs_set_transaction_flag(NILFS_TI_SYNC);
735 nilfs_transaction_commit(sb);
736 /* May construct a logical segment and may fail in sync mode.
737 But delete_inode has no return value. */
740 int nilfs_setattr(struct dentry *dentry, struct iattr *iattr)
742 struct nilfs_transaction_info ti;
743 struct inode *inode = dentry->d_inode;
744 struct super_block *sb = inode->i_sb;
747 err = inode_change_ok(inode, iattr);
751 err = nilfs_transaction_begin(sb, &ti, 0);
755 if ((iattr->ia_valid & ATTR_SIZE) &&
756 iattr->ia_size != i_size_read(inode)) {
757 err = vmtruncate(inode, iattr->ia_size);
762 setattr_copy(inode, iattr);
763 mark_inode_dirty(inode);
765 if (iattr->ia_valid & ATTR_MODE) {
766 err = nilfs_acl_chmod(inode);
771 return nilfs_transaction_commit(sb);
774 nilfs_transaction_abort(sb);
778 int nilfs_permission(struct inode *inode, int mask, unsigned int flags)
780 struct nilfs_root *root;
782 if (flags & IPERM_FLAG_RCU)
785 root = NILFS_I(inode)->i_root;
786 if ((mask & MAY_WRITE) && root &&
787 root->cno != NILFS_CPTREE_CURRENT_CNO)
788 return -EROFS; /* snapshot is not writable */
790 return generic_permission(inode, mask, flags, NULL);
793 int nilfs_load_inode_block(struct inode *inode, struct buffer_head **pbh)
795 struct nilfs_sb_info *sbi = NILFS_SB(inode->i_sb);
796 struct nilfs_inode_info *ii = NILFS_I(inode);
799 spin_lock(&sbi->s_inode_lock);
800 if (ii->i_bh == NULL) {
801 spin_unlock(&sbi->s_inode_lock);
802 err = nilfs_ifile_get_inode_block(ii->i_root->ifile,
806 spin_lock(&sbi->s_inode_lock);
807 if (ii->i_bh == NULL)
817 spin_unlock(&sbi->s_inode_lock);
821 int nilfs_inode_dirty(struct inode *inode)
823 struct nilfs_inode_info *ii = NILFS_I(inode);
824 struct nilfs_sb_info *sbi = NILFS_SB(inode->i_sb);
827 if (!list_empty(&ii->i_dirty)) {
828 spin_lock(&sbi->s_inode_lock);
829 ret = test_bit(NILFS_I_DIRTY, &ii->i_state) ||
830 test_bit(NILFS_I_BUSY, &ii->i_state);
831 spin_unlock(&sbi->s_inode_lock);
836 int nilfs_set_file_dirty(struct inode *inode, unsigned nr_dirty)
838 struct nilfs_sb_info *sbi = NILFS_SB(inode->i_sb);
839 struct nilfs_inode_info *ii = NILFS_I(inode);
841 atomic_add(nr_dirty, &sbi->s_nilfs->ns_ndirtyblks);
843 if (test_and_set_bit(NILFS_I_DIRTY, &ii->i_state))
846 spin_lock(&sbi->s_inode_lock);
847 if (!test_bit(NILFS_I_QUEUED, &ii->i_state) &&
848 !test_bit(NILFS_I_BUSY, &ii->i_state)) {
849 /* Because this routine may race with nilfs_dispose_list(),
850 we have to check NILFS_I_QUEUED here, too. */
851 if (list_empty(&ii->i_dirty) && igrab(inode) == NULL) {
852 /* This will happen when somebody is freeing
854 nilfs_warning(sbi->s_super, __func__,
855 "cannot get inode (ino=%lu)\n",
857 spin_unlock(&sbi->s_inode_lock);
858 return -EINVAL; /* NILFS_I_DIRTY may remain for
861 list_del(&ii->i_dirty);
862 list_add_tail(&ii->i_dirty, &sbi->s_dirty_files);
863 set_bit(NILFS_I_QUEUED, &ii->i_state);
865 spin_unlock(&sbi->s_inode_lock);
869 int nilfs_mark_inode_dirty(struct inode *inode)
871 struct buffer_head *ibh;
874 err = nilfs_load_inode_block(inode, &ibh);
876 nilfs_warning(inode->i_sb, __func__,
877 "failed to reget inode block.\n");
880 nilfs_update_inode(inode, ibh);
881 nilfs_mdt_mark_buffer_dirty(ibh);
882 nilfs_mdt_mark_dirty(NILFS_I(inode)->i_root->ifile);
888 * nilfs_dirty_inode - reflect changes on given inode to an inode block.
889 * @inode: inode of the file to be registered.
891 * nilfs_dirty_inode() loads a inode block containing the specified
892 * @inode and copies data from a nilfs_inode to a corresponding inode
893 * entry in the inode block. This operation is excluded from the segment
894 * construction. This function can be called both as a single operation
895 * and as a part of indivisible file operations.
897 void nilfs_dirty_inode(struct inode *inode)
899 struct nilfs_transaction_info ti;
900 struct nilfs_mdt_info *mdi = NILFS_MDT(inode);
902 if (is_bad_inode(inode)) {
903 nilfs_warning(inode->i_sb, __func__,
904 "tried to mark bad_inode dirty. ignored.\n");
909 nilfs_mdt_mark_dirty(inode);
912 nilfs_transaction_begin(inode->i_sb, &ti, 0);
913 nilfs_mark_inode_dirty(inode);
914 nilfs_transaction_commit(inode->i_sb); /* never fails */
917 int nilfs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
918 __u64 start, __u64 len)
920 struct the_nilfs *nilfs = NILFS_I_NILFS(inode);
921 __u64 logical = 0, phys = 0, size = 0;
924 sector_t blkoff, end_blkoff;
925 sector_t delalloc_blkoff;
926 unsigned long delalloc_blklen;
927 unsigned int blkbits = inode->i_blkbits;
930 ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC);
934 mutex_lock(&inode->i_mutex);
936 isize = i_size_read(inode);
938 blkoff = start >> blkbits;
939 end_blkoff = (start + len - 1) >> blkbits;
941 delalloc_blklen = nilfs_find_uncommitted_extent(inode, blkoff,
946 unsigned int maxblocks;
948 if (delalloc_blklen && blkoff == delalloc_blkoff) {
950 /* End of the current extent */
951 ret = fiemap_fill_next_extent(
952 fieinfo, logical, phys, size, flags);
956 if (blkoff > end_blkoff)
959 flags = FIEMAP_EXTENT_MERGED | FIEMAP_EXTENT_DELALLOC;
960 logical = blkoff << blkbits;
962 size = delalloc_blklen << blkbits;
964 blkoff = delalloc_blkoff + delalloc_blklen;
965 delalloc_blklen = nilfs_find_uncommitted_extent(
966 inode, blkoff, &delalloc_blkoff);
971 * Limit the number of blocks that we look up so as
972 * not to get into the next delayed allocation extent.
976 maxblocks = min_t(sector_t, delalloc_blkoff - blkoff,
980 down_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem);
981 n = nilfs_bmap_lookup_contig(
982 NILFS_I(inode)->i_bmap, blkoff, &blkphy, maxblocks);
983 up_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem);
988 if (unlikely(n != -ENOENT))
993 past_eof = ((blkoff << blkbits) >= isize);
996 /* End of the current extent */
999 flags |= FIEMAP_EXTENT_LAST;
1001 ret = fiemap_fill_next_extent(
1002 fieinfo, logical, phys, size, flags);
1007 if (blkoff > end_blkoff || past_eof)
1011 if (phys && blkphy << blkbits == phys + size) {
1012 /* The current extent goes on */
1013 size += n << blkbits;
1015 /* Terminate the current extent */
1016 ret = fiemap_fill_next_extent(
1017 fieinfo, logical, phys, size,
1019 if (ret || blkoff > end_blkoff)
1022 /* Start another extent */
1023 flags = FIEMAP_EXTENT_MERGED;
1024 logical = blkoff << blkbits;
1025 phys = blkphy << blkbits;
1026 size = n << blkbits;
1029 /* Start a new extent */
1030 flags = FIEMAP_EXTENT_MERGED;
1031 logical = blkoff << blkbits;
1032 phys = blkphy << blkbits;
1033 size = n << blkbits;
1040 /* If ret is 1 then we just hit the end of the extent array */
1044 mutex_unlock(&inode->i_mutex);