2 * Copyright (C) 2007 Oracle. All rights reserved.
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public
6 * License v2 as published by the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
13 * You should have received a copy of the GNU General Public
14 * License along with this program; if not, write to the
15 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
16 * Boston, MA 021110-1307, USA.
19 #include <linux/buffer_head.h>
21 #include <linux/pagemap.h>
22 #include <linux/highmem.h>
23 #include <linux/time.h>
24 #include <linux/init.h>
25 #include <linux/string.h>
26 #include <linux/smp_lock.h>
27 #include <linux/backing-dev.h>
28 #include <linux/mpage.h>
29 #include <linux/swap.h>
30 #include <linux/writeback.h>
31 #include <linux/statfs.h>
32 #include <linux/compat.h>
33 #include <linux/bit_spinlock.h>
34 #include <linux/version.h>
37 #include "transaction.h"
38 #include "btrfs_inode.h"
40 #include "print-tree.h"
42 struct btrfs_iget_args
{
44 struct btrfs_root
*root
;
47 static struct inode_operations btrfs_dir_inode_operations
;
48 static struct inode_operations btrfs_symlink_inode_operations
;
49 static struct inode_operations btrfs_dir_ro_inode_operations
;
50 static struct inode_operations btrfs_special_inode_operations
;
51 static struct inode_operations btrfs_file_inode_operations
;
52 static struct address_space_operations btrfs_aops
;
53 static struct address_space_operations btrfs_symlink_aops
;
54 static struct file_operations btrfs_dir_file_operations
;
55 static struct extent_map_ops btrfs_extent_map_ops
;
57 static struct kmem_cache
*btrfs_inode_cachep
;
58 struct kmem_cache
*btrfs_trans_handle_cachep
;
59 struct kmem_cache
*btrfs_transaction_cachep
;
60 struct kmem_cache
*btrfs_bit_radix_cachep
;
61 struct kmem_cache
*btrfs_path_cachep
;
64 static unsigned char btrfs_type_by_mode
[S_IFMT
>> S_SHIFT
] = {
65 [S_IFREG
>> S_SHIFT
] = BTRFS_FT_REG_FILE
,
66 [S_IFDIR
>> S_SHIFT
] = BTRFS_FT_DIR
,
67 [S_IFCHR
>> S_SHIFT
] = BTRFS_FT_CHRDEV
,
68 [S_IFBLK
>> S_SHIFT
] = BTRFS_FT_BLKDEV
,
69 [S_IFIFO
>> S_SHIFT
] = BTRFS_FT_FIFO
,
70 [S_IFSOCK
>> S_SHIFT
] = BTRFS_FT_SOCK
,
71 [S_IFLNK
>> S_SHIFT
] = BTRFS_FT_SYMLINK
,
74 static int run_delalloc_range(struct inode
*inode
, u64 start
, u64 end
)
76 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
77 struct btrfs_trans_handle
*trans
;
82 u64 blocksize
= 1 << inode
->i_blkbits
;
84 mutex_lock(&root
->fs_info
->fs_mutex
);
85 trans
= btrfs_start_transaction(root
, 1);
86 btrfs_set_trans_block_group(trans
, inode
);
88 num_blocks
= (end
- start
+ blocksize
) & ~(blocksize
- 1);
89 ret
= btrfs_drop_extents(trans
, root
, inode
,
90 start
, start
+ num_blocks
, &alloc_hint
);
91 num_blocks
= num_blocks
>> inode
->i_blkbits
;
92 ret
= btrfs_alloc_extent(trans
, root
, inode
->i_ino
, num_blocks
, 0,
93 alloc_hint
, (u64
)-1, &ins
, 1);
98 ret
= btrfs_insert_file_extent(trans
, root
, inode
->i_ino
,
99 start
, ins
.objectid
, ins
.offset
,
102 btrfs_end_transaction(trans
, root
);
103 mutex_unlock(&root
->fs_info
->fs_mutex
);
107 int btrfs_writepage_io_hook(struct page
*page
, u64 start
, u64 end
)
109 struct inode
*inode
= page
->mapping
->host
;
110 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
111 struct btrfs_trans_handle
*trans
;
114 u64 page_start
= page
->index
<< PAGE_CACHE_SHIFT
;
115 size_t offset
= start
- page_start
;
117 mutex_lock(&root
->fs_info
->fs_mutex
);
118 trans
= btrfs_start_transaction(root
, 1);
119 btrfs_set_trans_block_group(trans
, inode
);
121 btrfs_csum_file_block(trans
, root
, inode
->i_ino
,
122 start
, kaddr
+ offset
, end
- start
+ 1);
124 ret
= btrfs_end_transaction(trans
, root
);
126 mutex_unlock(&root
->fs_info
->fs_mutex
);
130 int btrfs_readpage_io_hook(struct page
*page
, u64 start
, u64 end
)
133 struct inode
*inode
= page
->mapping
->host
;
134 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
135 struct extent_map_tree
*em_tree
= &BTRFS_I(inode
)->extent_tree
;
136 struct btrfs_csum_item
*item
;
137 struct btrfs_path
*path
= NULL
;
140 mutex_lock(&root
->fs_info
->fs_mutex
);
141 path
= btrfs_alloc_path();
142 item
= btrfs_lookup_csum(NULL
, root
, path
, inode
->i_ino
, start
, 0);
145 /* a csum that isn't present is a preallocated region. */
146 if (ret
== -ENOENT
|| ret
== -EFBIG
)
151 memcpy((char *)&private, &item
->csum
, BTRFS_CRC32_SIZE
);
152 set_state_private(em_tree
, start
, private);
155 btrfs_free_path(path
);
156 mutex_unlock(&root
->fs_info
->fs_mutex
);
160 int btrfs_readpage_end_io_hook(struct page
*page
, u64 start
, u64 end
)
162 char csum
[BTRFS_CRC32_SIZE
];
163 size_t offset
= start
- (page
->index
<< PAGE_CACHE_SHIFT
);
164 struct inode
*inode
= page
->mapping
->host
;
165 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
166 struct extent_map_tree
*em_tree
= &BTRFS_I(inode
)->extent_tree
;
171 ret
= get_state_private(em_tree
, start
, &private);
172 kaddr
= kmap_atomic(page
, KM_IRQ0
);
176 ret
= btrfs_csum_data(root
, kaddr
+ offset
, end
- start
+ 1, csum
);
178 if (memcmp(csum
, &private, BTRFS_CRC32_SIZE
)) {
181 kunmap_atomic(kaddr
, KM_IRQ0
);
185 printk("btrfs csum failed ino %lu off %llu\n",
186 page
->mapping
->host
->i_ino
, (unsigned long long)start
);
187 memset(kaddr
+ offset
, 1, end
- start
+ 1); flush_dcache_page(page
);
188 kunmap_atomic(kaddr
, KM_IRQ0
);
192 void btrfs_read_locked_inode(struct inode
*inode
)
194 struct btrfs_path
*path
;
195 struct btrfs_inode_item
*inode_item
;
196 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
197 struct btrfs_key location
;
198 u64 alloc_group_block
;
202 path
= btrfs_alloc_path();
204 mutex_lock(&root
->fs_info
->fs_mutex
);
206 memcpy(&location
, &BTRFS_I(inode
)->location
, sizeof(location
));
207 ret
= btrfs_lookup_inode(NULL
, root
, path
, &location
, 0);
211 inode_item
= btrfs_item_ptr(btrfs_buffer_leaf(path
->nodes
[0]),
213 struct btrfs_inode_item
);
215 inode
->i_mode
= btrfs_inode_mode(inode_item
);
216 inode
->i_nlink
= btrfs_inode_nlink(inode_item
);
217 inode
->i_uid
= btrfs_inode_uid(inode_item
);
218 inode
->i_gid
= btrfs_inode_gid(inode_item
);
219 inode
->i_size
= btrfs_inode_size(inode_item
);
220 inode
->i_atime
.tv_sec
= btrfs_timespec_sec(&inode_item
->atime
);
221 inode
->i_atime
.tv_nsec
= btrfs_timespec_nsec(&inode_item
->atime
);
222 inode
->i_mtime
.tv_sec
= btrfs_timespec_sec(&inode_item
->mtime
);
223 inode
->i_mtime
.tv_nsec
= btrfs_timespec_nsec(&inode_item
->mtime
);
224 inode
->i_ctime
.tv_sec
= btrfs_timespec_sec(&inode_item
->ctime
);
225 inode
->i_ctime
.tv_nsec
= btrfs_timespec_nsec(&inode_item
->ctime
);
226 inode
->i_blocks
= btrfs_inode_nblocks(inode_item
);
227 inode
->i_generation
= btrfs_inode_generation(inode_item
);
229 rdev
= btrfs_inode_rdev(inode_item
);
230 alloc_group_block
= btrfs_inode_block_group(inode_item
);
231 BTRFS_I(inode
)->block_group
= btrfs_lookup_block_group(root
->fs_info
,
234 btrfs_free_path(path
);
237 mutex_unlock(&root
->fs_info
->fs_mutex
);
239 switch (inode
->i_mode
& S_IFMT
) {
241 inode
->i_mapping
->a_ops
= &btrfs_aops
;
242 BTRFS_I(inode
)->extent_tree
.ops
= &btrfs_extent_map_ops
;
243 inode
->i_fop
= &btrfs_file_operations
;
244 inode
->i_op
= &btrfs_file_inode_operations
;
247 inode
->i_fop
= &btrfs_dir_file_operations
;
248 if (root
== root
->fs_info
->tree_root
)
249 inode
->i_op
= &btrfs_dir_ro_inode_operations
;
251 inode
->i_op
= &btrfs_dir_inode_operations
;
254 inode
->i_op
= &btrfs_symlink_inode_operations
;
255 inode
->i_mapping
->a_ops
= &btrfs_symlink_aops
;
258 init_special_inode(inode
, inode
->i_mode
, rdev
);
264 btrfs_release_path(root
, path
);
265 btrfs_free_path(path
);
266 mutex_unlock(&root
->fs_info
->fs_mutex
);
267 make_bad_inode(inode
);
270 static void fill_inode_item(struct btrfs_inode_item
*item
,
273 btrfs_set_inode_uid(item
, inode
->i_uid
);
274 btrfs_set_inode_gid(item
, inode
->i_gid
);
275 btrfs_set_inode_size(item
, inode
->i_size
);
276 btrfs_set_inode_mode(item
, inode
->i_mode
);
277 btrfs_set_inode_nlink(item
, inode
->i_nlink
);
278 btrfs_set_timespec_sec(&item
->atime
, inode
->i_atime
.tv_sec
);
279 btrfs_set_timespec_nsec(&item
->atime
, inode
->i_atime
.tv_nsec
);
280 btrfs_set_timespec_sec(&item
->mtime
, inode
->i_mtime
.tv_sec
);
281 btrfs_set_timespec_nsec(&item
->mtime
, inode
->i_mtime
.tv_nsec
);
282 btrfs_set_timespec_sec(&item
->ctime
, inode
->i_ctime
.tv_sec
);
283 btrfs_set_timespec_nsec(&item
->ctime
, inode
->i_ctime
.tv_nsec
);
284 btrfs_set_inode_nblocks(item
, inode
->i_blocks
);
285 btrfs_set_inode_generation(item
, inode
->i_generation
);
286 btrfs_set_inode_rdev(item
, inode
->i_rdev
);
287 btrfs_set_inode_block_group(item
,
288 BTRFS_I(inode
)->block_group
->key
.objectid
);
291 int btrfs_update_inode(struct btrfs_trans_handle
*trans
,
292 struct btrfs_root
*root
,
295 struct btrfs_inode_item
*inode_item
;
296 struct btrfs_path
*path
;
299 path
= btrfs_alloc_path();
301 ret
= btrfs_lookup_inode(trans
, root
, path
,
302 &BTRFS_I(inode
)->location
, 1);
309 inode_item
= btrfs_item_ptr(btrfs_buffer_leaf(path
->nodes
[0]),
311 struct btrfs_inode_item
);
313 fill_inode_item(inode_item
, inode
);
314 btrfs_mark_buffer_dirty(path
->nodes
[0]);
315 btrfs_set_inode_last_trans(trans
, inode
);
318 btrfs_release_path(root
, path
);
319 btrfs_free_path(path
);
324 static int btrfs_unlink_trans(struct btrfs_trans_handle
*trans
,
325 struct btrfs_root
*root
,
327 struct dentry
*dentry
)
329 struct btrfs_path
*path
;
330 const char *name
= dentry
->d_name
.name
;
331 int name_len
= dentry
->d_name
.len
;
334 struct btrfs_dir_item
*di
;
336 path
= btrfs_alloc_path();
342 di
= btrfs_lookup_dir_item(trans
, root
, path
, dir
->i_ino
,
352 objectid
= btrfs_disk_key_objectid(&di
->location
);
353 ret
= btrfs_delete_one_dir_name(trans
, root
, path
, di
);
356 btrfs_release_path(root
, path
);
358 di
= btrfs_lookup_dir_index_item(trans
, root
, path
, dir
->i_ino
,
359 objectid
, name
, name_len
, -1);
368 ret
= btrfs_delete_one_dir_name(trans
, root
, path
, di
);
370 dentry
->d_inode
->i_ctime
= dir
->i_ctime
;
372 btrfs_free_path(path
);
374 dir
->i_size
-= name_len
* 2;
375 dir
->i_mtime
= dir
->i_ctime
= CURRENT_TIME
;
376 btrfs_update_inode(trans
, root
, dir
);
377 drop_nlink(dentry
->d_inode
);
378 ret
= btrfs_update_inode(trans
, root
, dentry
->d_inode
);
379 dir
->i_sb
->s_dirt
= 1;
384 static int btrfs_unlink(struct inode
*dir
, struct dentry
*dentry
)
386 struct btrfs_root
*root
;
387 struct btrfs_trans_handle
*trans
;
391 root
= BTRFS_I(dir
)->root
;
392 mutex_lock(&root
->fs_info
->fs_mutex
);
393 trans
= btrfs_start_transaction(root
, 1);
394 btrfs_set_trans_block_group(trans
, dir
);
395 ret
= btrfs_unlink_trans(trans
, root
, dir
, dentry
);
396 nr
= trans
->blocks_used
;
397 btrfs_end_transaction(trans
, root
);
398 mutex_unlock(&root
->fs_info
->fs_mutex
);
399 btrfs_btree_balance_dirty(root
, nr
);
403 static int btrfs_rmdir(struct inode
*dir
, struct dentry
*dentry
)
405 struct inode
*inode
= dentry
->d_inode
;
408 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
409 struct btrfs_path
*path
;
410 struct btrfs_key key
;
411 struct btrfs_trans_handle
*trans
;
412 struct btrfs_key found_key
;
414 struct btrfs_leaf
*leaf
;
415 char *goodnames
= "..";
418 path
= btrfs_alloc_path();
420 mutex_lock(&root
->fs_info
->fs_mutex
);
421 trans
= btrfs_start_transaction(root
, 1);
422 btrfs_set_trans_block_group(trans
, dir
);
423 key
.objectid
= inode
->i_ino
;
424 key
.offset
= (u64
)-1;
427 ret
= btrfs_search_slot(trans
, root
, &key
, path
, -1, 1);
433 if (path
->slots
[0] == 0) {
438 leaf
= btrfs_buffer_leaf(path
->nodes
[0]);
439 btrfs_disk_key_to_cpu(&found_key
,
440 &leaf
->items
[path
->slots
[0]].key
);
441 found_type
= btrfs_key_type(&found_key
);
442 if (found_key
.objectid
!= inode
->i_ino
) {
446 if ((found_type
!= BTRFS_DIR_ITEM_KEY
&&
447 found_type
!= BTRFS_DIR_INDEX_KEY
) ||
448 (!btrfs_match_dir_item_name(root
, path
, goodnames
, 2) &&
449 !btrfs_match_dir_item_name(root
, path
, goodnames
, 1))) {
453 ret
= btrfs_del_item(trans
, root
, path
);
456 if (found_type
== BTRFS_DIR_ITEM_KEY
&& found_key
.offset
== 1)
458 btrfs_release_path(root
, path
);
461 btrfs_release_path(root
, path
);
463 /* now the directory is empty */
464 err
= btrfs_unlink_trans(trans
, root
, dir
, dentry
);
469 btrfs_release_path(root
, path
);
470 btrfs_free_path(path
);
471 mutex_unlock(&root
->fs_info
->fs_mutex
);
472 nr
= trans
->blocks_used
;
473 ret
= btrfs_end_transaction(trans
, root
);
474 btrfs_btree_balance_dirty(root
, nr
);
480 static int btrfs_free_inode(struct btrfs_trans_handle
*trans
,
481 struct btrfs_root
*root
,
484 struct btrfs_path
*path
;
489 path
= btrfs_alloc_path();
491 ret
= btrfs_lookup_inode(trans
, root
, path
,
492 &BTRFS_I(inode
)->location
, -1);
496 ret
= btrfs_del_item(trans
, root
, path
);
497 btrfs_free_path(path
);
502 * this can truncate away extent items, csum items and directory items.
503 * It starts at a high offset and removes keys until it can't find
504 * any higher than i_size.
506 * csum items that cross the new i_size are truncated to the new size
509 static int btrfs_truncate_in_trans(struct btrfs_trans_handle
*trans
,
510 struct btrfs_root
*root
,
514 struct btrfs_path
*path
;
515 struct btrfs_key key
;
516 struct btrfs_disk_key
*found_key
;
518 struct btrfs_leaf
*leaf
;
519 struct btrfs_file_extent_item
*fi
;
520 u64 extent_start
= 0;
521 u64 extent_num_blocks
= 0;
526 btrfs_drop_extent_cache(inode
, inode
->i_size
, (u64
)-1);
527 path
= btrfs_alloc_path();
530 /* FIXME, add redo link to tree so we don't leak on crash */
531 key
.objectid
= inode
->i_ino
;
532 key
.offset
= (u64
)-1;
535 btrfs_init_path(path
);
537 ret
= btrfs_search_slot(trans
, root
, &key
, path
, -1, 1);
542 BUG_ON(path
->slots
[0] == 0);
545 leaf
= btrfs_buffer_leaf(path
->nodes
[0]);
546 found_key
= &leaf
->items
[path
->slots
[0]].key
;
547 found_type
= btrfs_disk_key_type(found_key
);
549 if (btrfs_disk_key_objectid(found_key
) != inode
->i_ino
)
551 if (found_type
!= BTRFS_CSUM_ITEM_KEY
&&
552 found_type
!= BTRFS_DIR_ITEM_KEY
&&
553 found_type
!= BTRFS_DIR_INDEX_KEY
&&
554 found_type
!= BTRFS_EXTENT_DATA_KEY
)
557 item_end
= btrfs_disk_key_offset(found_key
);
558 if (found_type
== BTRFS_EXTENT_DATA_KEY
) {
559 fi
= btrfs_item_ptr(btrfs_buffer_leaf(path
->nodes
[0]),
561 struct btrfs_file_extent_item
);
562 if (btrfs_file_extent_type(fi
) !=
563 BTRFS_FILE_EXTENT_INLINE
) {
564 item_end
+= btrfs_file_extent_num_blocks(fi
) <<
568 if (found_type
== BTRFS_CSUM_ITEM_KEY
) {
569 ret
= btrfs_csum_truncate(trans
, root
, path
,
573 if (item_end
< inode
->i_size
) {
574 if (found_type
== BTRFS_DIR_ITEM_KEY
) {
575 found_type
= BTRFS_INODE_ITEM_KEY
;
576 } else if (found_type
== BTRFS_EXTENT_ITEM_KEY
) {
577 found_type
= BTRFS_CSUM_ITEM_KEY
;
578 } else if (found_type
) {
583 btrfs_set_key_type(&key
, found_type
);
586 if (btrfs_disk_key_offset(found_key
) >= inode
->i_size
)
592 /* FIXME, shrink the extent if the ref count is only 1 */
593 if (found_type
== BTRFS_EXTENT_DATA_KEY
&&
594 btrfs_file_extent_type(fi
) !=
595 BTRFS_FILE_EXTENT_INLINE
) {
597 extent_start
= btrfs_file_extent_disk_blocknr(fi
);
599 u64 orig_num_blocks
=
600 btrfs_file_extent_num_blocks(fi
);
601 extent_num_blocks
= inode
->i_size
-
602 btrfs_disk_key_offset(found_key
) +
604 extent_num_blocks
>>= inode
->i_blkbits
;
605 btrfs_set_file_extent_num_blocks(fi
,
607 num_dec
= (orig_num_blocks
-
608 extent_num_blocks
) << 3;
609 if (extent_start
!= 0) {
610 inode
->i_blocks
-= num_dec
;
612 btrfs_mark_buffer_dirty(path
->nodes
[0]);
615 btrfs_file_extent_disk_num_blocks(fi
);
616 /* FIXME blocksize != 4096 */
617 num_dec
= btrfs_file_extent_num_blocks(fi
) << 3;
618 if (extent_start
!= 0) {
620 inode
->i_blocks
-= num_dec
;
625 ret
= btrfs_del_item(trans
, root
, path
);
631 btrfs_release_path(root
, path
);
633 ret
= btrfs_free_extent(trans
, root
, extent_start
,
634 extent_num_blocks
, 0);
640 btrfs_release_path(root
, path
);
641 btrfs_free_path(path
);
642 inode
->i_sb
->s_dirt
= 1;
646 static int btrfs_cow_one_page(struct inode
*inode
, struct page
*page
,
651 struct extent_map_tree
*em_tree
= &BTRFS_I(inode
)->extent_tree
;
652 u64 page_start
= page
->index
<< PAGE_CACHE_SHIFT
;
653 u64 page_end
= page_start
+ PAGE_CACHE_SIZE
- 1;
655 if (!PagePrivate(page
)) {
656 SetPagePrivate(page
);
657 set_page_private(page
, 1);
658 WARN_ON(!page
->mapping
->a_ops
->invalidatepage
);
659 page_cache_get(page
);
662 lock_extent(em_tree
, page_start
, page_end
, GFP_NOFS
);
663 set_extent_delalloc(&BTRFS_I(inode
)->extent_tree
, page_start
,
665 if (zero_start
!= PAGE_CACHE_SIZE
) {
667 memset(kaddr
+ zero_start
, 0, PAGE_CACHE_SIZE
- zero_start
);
668 flush_dcache_page(page
);
671 set_page_dirty(page
);
672 unlock_extent(em_tree
, page_start
, page_end
, GFP_NOFS
);
678 * taken from block_truncate_page, but does cow as it zeros out
679 * any bytes left in the last page in the file.
681 static int btrfs_truncate_page(struct address_space
*mapping
, loff_t from
)
683 struct inode
*inode
= mapping
->host
;
684 unsigned blocksize
= 1 << inode
->i_blkbits
;
685 pgoff_t index
= from
>> PAGE_CACHE_SHIFT
;
686 unsigned offset
= from
& (PAGE_CACHE_SIZE
-1);
691 if ((offset
& (blocksize
- 1)) == 0)
694 down_read(&BTRFS_I(inode
)->root
->snap_sem
);
696 page
= grab_cache_page(mapping
, index
);
699 if (!PageUptodate(page
)) {
700 ret
= btrfs_readpage(NULL
, page
);
702 if (!PageUptodate(page
)) {
707 page_start
= page
->index
<< PAGE_CACHE_SHIFT
;
709 ret
= btrfs_cow_one_page(inode
, page
, offset
);
712 page_cache_release(page
);
713 up_read(&BTRFS_I(inode
)->root
->snap_sem
);
718 static int btrfs_setattr(struct dentry
*dentry
, struct iattr
*attr
)
720 struct inode
*inode
= dentry
->d_inode
;
723 err
= inode_change_ok(inode
, attr
);
727 if (S_ISREG(inode
->i_mode
) &&
728 attr
->ia_valid
& ATTR_SIZE
&& attr
->ia_size
> inode
->i_size
) {
729 struct btrfs_trans_handle
*trans
;
730 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
731 struct extent_map_tree
*em_tree
= &BTRFS_I(inode
)->extent_tree
;
733 u64 mask
= root
->blocksize
- 1;
734 u64 pos
= (inode
->i_size
+ mask
) & ~mask
;
735 u64 block_end
= attr
->ia_size
| mask
;
739 if (attr
->ia_size
<= pos
)
742 btrfs_truncate_page(inode
->i_mapping
, inode
->i_size
);
744 lock_extent(em_tree
, pos
, block_end
, GFP_NOFS
);
745 hole_size
= (attr
->ia_size
- pos
+ mask
) & ~mask
;
747 mutex_lock(&root
->fs_info
->fs_mutex
);
748 trans
= btrfs_start_transaction(root
, 1);
749 btrfs_set_trans_block_group(trans
, inode
);
750 err
= btrfs_drop_extents(trans
, root
, inode
,
751 pos
, pos
+ hole_size
, &alloc_hint
);
753 hole_size
>>= inode
->i_blkbits
;
755 err
= btrfs_insert_file_extent(trans
, root
, inode
->i_ino
,
756 pos
, 0, 0, hole_size
);
757 btrfs_end_transaction(trans
, root
);
758 mutex_unlock(&root
->fs_info
->fs_mutex
);
759 unlock_extent(em_tree
, pos
, block_end
, GFP_NOFS
);
764 err
= inode_setattr(inode
, attr
);
768 void btrfs_delete_inode(struct inode
*inode
)
770 struct btrfs_trans_handle
*trans
;
771 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
775 truncate_inode_pages(&inode
->i_data
, 0);
776 if (is_bad_inode(inode
)) {
780 mutex_lock(&root
->fs_info
->fs_mutex
);
781 trans
= btrfs_start_transaction(root
, 1);
782 btrfs_set_trans_block_group(trans
, inode
);
783 ret
= btrfs_truncate_in_trans(trans
, root
, inode
);
786 ret
= btrfs_free_inode(trans
, root
, inode
);
789 nr
= trans
->blocks_used
;
790 btrfs_end_transaction(trans
, root
);
791 mutex_unlock(&root
->fs_info
->fs_mutex
);
792 btrfs_btree_balance_dirty(root
, nr
);
796 nr
= trans
->blocks_used
;
797 btrfs_end_transaction(trans
, root
);
798 mutex_unlock(&root
->fs_info
->fs_mutex
);
799 btrfs_btree_balance_dirty(root
, nr
);
805 * this returns the key found in the dir entry in the location pointer.
806 * If no dir entries were found, location->objectid is 0.
808 static int btrfs_inode_by_name(struct inode
*dir
, struct dentry
*dentry
,
809 struct btrfs_key
*location
)
811 const char *name
= dentry
->d_name
.name
;
812 int namelen
= dentry
->d_name
.len
;
813 struct btrfs_dir_item
*di
;
814 struct btrfs_path
*path
;
815 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
818 path
= btrfs_alloc_path();
820 di
= btrfs_lookup_dir_item(NULL
, root
, path
, dir
->i_ino
, name
,
822 if (!di
|| IS_ERR(di
)) {
823 location
->objectid
= 0;
827 btrfs_disk_key_to_cpu(location
, &di
->location
);
829 btrfs_release_path(root
, path
);
830 btrfs_free_path(path
);
835 * when we hit a tree root in a directory, the btrfs part of the inode
836 * needs to be changed to reflect the root directory of the tree root. This
837 * is kind of like crossing a mount point.
839 static int fixup_tree_root_location(struct btrfs_root
*root
,
840 struct btrfs_key
*location
,
841 struct btrfs_root
**sub_root
,
842 struct dentry
*dentry
)
844 struct btrfs_path
*path
;
845 struct btrfs_root_item
*ri
;
847 if (btrfs_key_type(location
) != BTRFS_ROOT_ITEM_KEY
)
849 if (location
->objectid
== BTRFS_ROOT_TREE_OBJECTID
)
852 path
= btrfs_alloc_path();
854 mutex_lock(&root
->fs_info
->fs_mutex
);
856 *sub_root
= btrfs_read_fs_root(root
->fs_info
, location
,
859 if (IS_ERR(*sub_root
))
860 return PTR_ERR(*sub_root
);
862 ri
= &(*sub_root
)->root_item
;
863 location
->objectid
= btrfs_root_dirid(ri
);
865 btrfs_set_key_type(location
, BTRFS_INODE_ITEM_KEY
);
866 location
->offset
= 0;
868 btrfs_free_path(path
);
869 mutex_unlock(&root
->fs_info
->fs_mutex
);
873 static int btrfs_init_locked_inode(struct inode
*inode
, void *p
)
875 struct btrfs_iget_args
*args
= p
;
876 inode
->i_ino
= args
->ino
;
877 BTRFS_I(inode
)->root
= args
->root
;
878 extent_map_tree_init(&BTRFS_I(inode
)->extent_tree
,
879 inode
->i_mapping
, GFP_NOFS
);
883 static int btrfs_find_actor(struct inode
*inode
, void *opaque
)
885 struct btrfs_iget_args
*args
= opaque
;
886 return (args
->ino
== inode
->i_ino
&&
887 args
->root
== BTRFS_I(inode
)->root
);
890 struct inode
*btrfs_iget_locked(struct super_block
*s
, u64 objectid
,
891 struct btrfs_root
*root
)
894 struct btrfs_iget_args args
;
898 inode
= iget5_locked(s
, objectid
, btrfs_find_actor
,
899 btrfs_init_locked_inode
,
904 static struct dentry
*btrfs_lookup(struct inode
*dir
, struct dentry
*dentry
,
905 struct nameidata
*nd
)
907 struct inode
* inode
;
908 struct btrfs_inode
*bi
= BTRFS_I(dir
);
909 struct btrfs_root
*root
= bi
->root
;
910 struct btrfs_root
*sub_root
= root
;
911 struct btrfs_key location
;
914 if (dentry
->d_name
.len
> BTRFS_NAME_LEN
)
915 return ERR_PTR(-ENAMETOOLONG
);
916 mutex_lock(&root
->fs_info
->fs_mutex
);
917 ret
= btrfs_inode_by_name(dir
, dentry
, &location
);
918 mutex_unlock(&root
->fs_info
->fs_mutex
);
922 if (location
.objectid
) {
923 ret
= fixup_tree_root_location(root
, &location
, &sub_root
,
928 return ERR_PTR(-ENOENT
);
929 inode
= btrfs_iget_locked(dir
->i_sb
, location
.objectid
,
932 return ERR_PTR(-EACCES
);
933 if (inode
->i_state
& I_NEW
) {
934 /* the inode and parent dir are two different roots */
935 if (sub_root
!= root
) {
937 sub_root
->inode
= inode
;
939 BTRFS_I(inode
)->root
= sub_root
;
940 memcpy(&BTRFS_I(inode
)->location
, &location
,
942 btrfs_read_locked_inode(inode
);
943 unlock_new_inode(inode
);
946 return d_splice_alias(inode
, dentry
);
949 static unsigned char btrfs_filetype_table
[] = {
950 DT_UNKNOWN
, DT_REG
, DT_DIR
, DT_CHR
, DT_BLK
, DT_FIFO
, DT_SOCK
, DT_LNK
953 static int btrfs_readdir(struct file
*filp
, void *dirent
, filldir_t filldir
)
955 struct inode
*inode
= filp
->f_path
.dentry
->d_inode
;
956 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
957 struct btrfs_item
*item
;
958 struct btrfs_dir_item
*di
;
959 struct btrfs_key key
;
960 struct btrfs_path
*path
;
963 struct btrfs_leaf
*leaf
;
966 unsigned char d_type
;
971 int key_type
= BTRFS_DIR_INDEX_KEY
;
973 /* FIXME, use a real flag for deciding about the key type */
974 if (root
->fs_info
->tree_root
== root
)
975 key_type
= BTRFS_DIR_ITEM_KEY
;
976 mutex_lock(&root
->fs_info
->fs_mutex
);
977 key
.objectid
= inode
->i_ino
;
979 btrfs_set_key_type(&key
, key_type
);
980 key
.offset
= filp
->f_pos
;
981 path
= btrfs_alloc_path();
983 ret
= btrfs_search_slot(NULL
, root
, &key
, path
, 0, 0);
988 leaf
= btrfs_buffer_leaf(path
->nodes
[0]);
989 nritems
= btrfs_header_nritems(&leaf
->header
);
990 slot
= path
->slots
[0];
991 if (advance
|| slot
>= nritems
) {
992 if (slot
>= nritems
-1) {
993 ret
= btrfs_next_leaf(root
, path
);
996 leaf
= btrfs_buffer_leaf(path
->nodes
[0]);
997 nritems
= btrfs_header_nritems(&leaf
->header
);
998 slot
= path
->slots
[0];
1005 item
= leaf
->items
+ slot
;
1006 if (btrfs_disk_key_objectid(&item
->key
) != key
.objectid
)
1008 if (btrfs_disk_key_type(&item
->key
) != key_type
)
1010 if (btrfs_disk_key_offset(&item
->key
) < filp
->f_pos
)
1012 filp
->f_pos
= btrfs_disk_key_offset(&item
->key
);
1014 di
= btrfs_item_ptr(leaf
, slot
, struct btrfs_dir_item
);
1016 di_total
= btrfs_item_size(leaf
->items
+ slot
);
1017 while(di_cur
< di_total
) {
1018 d_type
= btrfs_filetype_table
[btrfs_dir_type(di
)];
1019 over
= filldir(dirent
, (const char *)(di
+ 1),
1020 btrfs_dir_name_len(di
),
1021 btrfs_disk_key_offset(&item
->key
),
1022 btrfs_disk_key_objectid(&di
->location
),
1026 di_len
= btrfs_dir_name_len(di
) + sizeof(*di
);
1028 di
= (struct btrfs_dir_item
*)((char *)di
+ di_len
);
1035 btrfs_release_path(root
, path
);
1036 btrfs_free_path(path
);
1037 mutex_unlock(&root
->fs_info
->fs_mutex
);
1041 int btrfs_write_inode(struct inode
*inode
, int wait
)
1043 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1044 struct btrfs_trans_handle
*trans
;
1048 mutex_lock(&root
->fs_info
->fs_mutex
);
1049 trans
= btrfs_start_transaction(root
, 1);
1050 btrfs_set_trans_block_group(trans
, inode
);
1051 ret
= btrfs_commit_transaction(trans
, root
);
1052 mutex_unlock(&root
->fs_info
->fs_mutex
);
1058 * This is somewhat expensive, updating the tree every time the
1059 * inode changes. But, it is most likely to find the inode in cache.
1060 * FIXME, needs more benchmarking...there are no reasons other than performance
1061 * to keep or drop this code.
1063 void btrfs_dirty_inode(struct inode
*inode
)
1065 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1066 struct btrfs_trans_handle
*trans
;
1068 mutex_lock(&root
->fs_info
->fs_mutex
);
1069 trans
= btrfs_start_transaction(root
, 1);
1070 btrfs_set_trans_block_group(trans
, inode
);
1071 btrfs_update_inode(trans
, root
, inode
);
1072 btrfs_end_transaction(trans
, root
);
1073 mutex_unlock(&root
->fs_info
->fs_mutex
);
1076 static struct inode
*btrfs_new_inode(struct btrfs_trans_handle
*trans
,
1077 struct btrfs_root
*root
,
1079 struct btrfs_block_group_cache
*group
,
1082 struct inode
*inode
;
1083 struct btrfs_inode_item inode_item
;
1084 struct btrfs_key
*location
;
1088 inode
= new_inode(root
->fs_info
->sb
);
1090 return ERR_PTR(-ENOMEM
);
1092 extent_map_tree_init(&BTRFS_I(inode
)->extent_tree
,
1093 inode
->i_mapping
, GFP_NOFS
);
1094 BTRFS_I(inode
)->root
= root
;
1100 group
= btrfs_find_block_group(root
, group
, 0, 0, owner
);
1101 BTRFS_I(inode
)->block_group
= group
;
1103 inode
->i_uid
= current
->fsuid
;
1104 inode
->i_gid
= current
->fsgid
;
1105 inode
->i_mode
= mode
;
1106 inode
->i_ino
= objectid
;
1107 inode
->i_blocks
= 0;
1108 inode
->i_mtime
= inode
->i_atime
= inode
->i_ctime
= CURRENT_TIME
;
1109 fill_inode_item(&inode_item
, inode
);
1110 location
= &BTRFS_I(inode
)->location
;
1111 location
->objectid
= objectid
;
1112 location
->flags
= 0;
1113 location
->offset
= 0;
1114 btrfs_set_key_type(location
, BTRFS_INODE_ITEM_KEY
);
1116 ret
= btrfs_insert_inode(trans
, root
, objectid
, &inode_item
);
1118 return ERR_PTR(ret
);
1119 insert_inode_hash(inode
);
1123 static inline u8
btrfs_inode_type(struct inode
*inode
)
1125 return btrfs_type_by_mode
[(inode
->i_mode
& S_IFMT
) >> S_SHIFT
];
1128 static int btrfs_add_link(struct btrfs_trans_handle
*trans
,
1129 struct dentry
*dentry
, struct inode
*inode
)
1132 struct btrfs_key key
;
1133 struct btrfs_root
*root
= BTRFS_I(dentry
->d_parent
->d_inode
)->root
;
1134 struct inode
*parent_inode
;
1135 key
.objectid
= inode
->i_ino
;
1137 btrfs_set_key_type(&key
, BTRFS_INODE_ITEM_KEY
);
1140 ret
= btrfs_insert_dir_item(trans
, root
,
1141 dentry
->d_name
.name
, dentry
->d_name
.len
,
1142 dentry
->d_parent
->d_inode
->i_ino
,
1143 &key
, btrfs_inode_type(inode
));
1145 parent_inode
= dentry
->d_parent
->d_inode
;
1146 parent_inode
->i_size
+= dentry
->d_name
.len
* 2;
1147 parent_inode
->i_mtime
= parent_inode
->i_ctime
= CURRENT_TIME
;
1148 ret
= btrfs_update_inode(trans
, root
,
1149 dentry
->d_parent
->d_inode
);
1154 static int btrfs_add_nondir(struct btrfs_trans_handle
*trans
,
1155 struct dentry
*dentry
, struct inode
*inode
)
1157 int err
= btrfs_add_link(trans
, dentry
, inode
);
1159 d_instantiate(dentry
, inode
);
1167 static int btrfs_mknod(struct inode
*dir
, struct dentry
*dentry
,
1168 int mode
, dev_t rdev
)
1170 struct btrfs_trans_handle
*trans
;
1171 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
1172 struct inode
*inode
;
1178 if (!new_valid_dev(rdev
))
1181 mutex_lock(&root
->fs_info
->fs_mutex
);
1182 trans
= btrfs_start_transaction(root
, 1);
1183 btrfs_set_trans_block_group(trans
, dir
);
1185 err
= btrfs_find_free_objectid(trans
, root
, dir
->i_ino
, &objectid
);
1191 inode
= btrfs_new_inode(trans
, root
, objectid
,
1192 BTRFS_I(dir
)->block_group
, mode
);
1193 err
= PTR_ERR(inode
);
1197 btrfs_set_trans_block_group(trans
, inode
);
1198 err
= btrfs_add_nondir(trans
, dentry
, inode
);
1202 inode
->i_op
= &btrfs_special_inode_operations
;
1203 init_special_inode(inode
, inode
->i_mode
, rdev
);
1204 btrfs_update_inode(trans
, root
, inode
);
1206 dir
->i_sb
->s_dirt
= 1;
1207 btrfs_update_inode_block_group(trans
, inode
);
1208 btrfs_update_inode_block_group(trans
, dir
);
1210 nr
= trans
->blocks_used
;
1211 btrfs_end_transaction(trans
, root
);
1212 mutex_unlock(&root
->fs_info
->fs_mutex
);
1215 inode_dec_link_count(inode
);
1218 btrfs_btree_balance_dirty(root
, nr
);
1222 static int btrfs_create(struct inode
*dir
, struct dentry
*dentry
,
1223 int mode
, struct nameidata
*nd
)
1225 struct btrfs_trans_handle
*trans
;
1226 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
1227 struct inode
*inode
;
1233 mutex_lock(&root
->fs_info
->fs_mutex
);
1234 trans
= btrfs_start_transaction(root
, 1);
1235 btrfs_set_trans_block_group(trans
, dir
);
1237 err
= btrfs_find_free_objectid(trans
, root
, dir
->i_ino
, &objectid
);
1243 inode
= btrfs_new_inode(trans
, root
, objectid
,
1244 BTRFS_I(dir
)->block_group
, mode
);
1245 err
= PTR_ERR(inode
);
1249 btrfs_set_trans_block_group(trans
, inode
);
1250 err
= btrfs_add_nondir(trans
, dentry
, inode
);
1254 inode
->i_mapping
->a_ops
= &btrfs_aops
;
1255 inode
->i_fop
= &btrfs_file_operations
;
1256 inode
->i_op
= &btrfs_file_inode_operations
;
1257 extent_map_tree_init(&BTRFS_I(inode
)->extent_tree
,
1258 inode
->i_mapping
, GFP_NOFS
);
1259 BTRFS_I(inode
)->extent_tree
.ops
= &btrfs_extent_map_ops
;
1261 dir
->i_sb
->s_dirt
= 1;
1262 btrfs_update_inode_block_group(trans
, inode
);
1263 btrfs_update_inode_block_group(trans
, dir
);
1265 nr
= trans
->blocks_used
;
1266 btrfs_end_transaction(trans
, root
);
1267 mutex_unlock(&root
->fs_info
->fs_mutex
);
1270 inode_dec_link_count(inode
);
1273 btrfs_btree_balance_dirty(root
, nr
);
1277 static int btrfs_link(struct dentry
*old_dentry
, struct inode
*dir
,
1278 struct dentry
*dentry
)
1280 struct btrfs_trans_handle
*trans
;
1281 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
1282 struct inode
*inode
= old_dentry
->d_inode
;
1287 if (inode
->i_nlink
== 0)
1291 mutex_lock(&root
->fs_info
->fs_mutex
);
1292 trans
= btrfs_start_transaction(root
, 1);
1293 btrfs_set_trans_block_group(trans
, dir
);
1294 atomic_inc(&inode
->i_count
);
1295 err
= btrfs_add_nondir(trans
, dentry
, inode
);
1298 dir
->i_sb
->s_dirt
= 1;
1299 btrfs_update_inode_block_group(trans
, dir
);
1300 err
= btrfs_update_inode(trans
, root
, inode
);
1304 nr
= trans
->blocks_used
;
1305 btrfs_end_transaction(trans
, root
);
1306 mutex_unlock(&root
->fs_info
->fs_mutex
);
1309 inode_dec_link_count(inode
);
1312 btrfs_btree_balance_dirty(root
, nr
);
1316 static int btrfs_make_empty_dir(struct btrfs_trans_handle
*trans
,
1317 struct btrfs_root
*root
,
1318 u64 objectid
, u64 dirid
)
1322 struct btrfs_key key
;
1327 key
.objectid
= objectid
;
1330 btrfs_set_key_type(&key
, BTRFS_INODE_ITEM_KEY
);
1332 ret
= btrfs_insert_dir_item(trans
, root
, buf
, 1, objectid
,
1333 &key
, BTRFS_FT_DIR
);
1336 key
.objectid
= dirid
;
1337 ret
= btrfs_insert_dir_item(trans
, root
, buf
, 2, objectid
,
1338 &key
, BTRFS_FT_DIR
);
1345 static int btrfs_mkdir(struct inode
*dir
, struct dentry
*dentry
, int mode
)
1347 struct inode
*inode
;
1348 struct btrfs_trans_handle
*trans
;
1349 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
1351 int drop_on_err
= 0;
1353 unsigned long nr
= 1;
1355 mutex_lock(&root
->fs_info
->fs_mutex
);
1356 trans
= btrfs_start_transaction(root
, 1);
1357 btrfs_set_trans_block_group(trans
, dir
);
1358 if (IS_ERR(trans
)) {
1359 err
= PTR_ERR(trans
);
1363 err
= btrfs_find_free_objectid(trans
, root
, dir
->i_ino
, &objectid
);
1369 inode
= btrfs_new_inode(trans
, root
, objectid
,
1370 BTRFS_I(dir
)->block_group
, S_IFDIR
| mode
);
1371 if (IS_ERR(inode
)) {
1372 err
= PTR_ERR(inode
);
1376 inode
->i_op
= &btrfs_dir_inode_operations
;
1377 inode
->i_fop
= &btrfs_dir_file_operations
;
1378 btrfs_set_trans_block_group(trans
, inode
);
1380 err
= btrfs_make_empty_dir(trans
, root
, inode
->i_ino
, dir
->i_ino
);
1385 err
= btrfs_update_inode(trans
, root
, inode
);
1388 err
= btrfs_add_link(trans
, dentry
, inode
);
1391 d_instantiate(dentry
, inode
);
1393 dir
->i_sb
->s_dirt
= 1;
1394 btrfs_update_inode_block_group(trans
, inode
);
1395 btrfs_update_inode_block_group(trans
, dir
);
1398 nr
= trans
->blocks_used
;
1399 btrfs_end_transaction(trans
, root
);
1401 mutex_unlock(&root
->fs_info
->fs_mutex
);
1404 btrfs_btree_balance_dirty(root
, nr
);
1408 struct extent_map
*btrfs_get_extent(struct inode
*inode
, struct page
*page
,
1409 size_t page_offset
, u64 start
, u64 end
,
1415 u64 extent_start
= 0;
1417 u64 objectid
= inode
->i_ino
;
1419 int failed_insert
= 0;
1420 struct btrfs_path
*path
;
1421 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1422 struct btrfs_file_extent_item
*item
;
1423 struct btrfs_leaf
*leaf
;
1424 struct btrfs_disk_key
*found_key
;
1425 struct extent_map
*em
= NULL
;
1426 struct extent_map_tree
*em_tree
= &BTRFS_I(inode
)->extent_tree
;
1427 struct btrfs_trans_handle
*trans
= NULL
;
1429 path
= btrfs_alloc_path();
1431 mutex_lock(&root
->fs_info
->fs_mutex
);
1434 em
= lookup_extent_mapping(em_tree
, start
, end
);
1439 em
= alloc_extent_map(GFP_NOFS
);
1447 em
->bdev
= inode
->i_sb
->s_bdev
;
1448 ret
= btrfs_lookup_file_extent(NULL
, root
, path
,
1449 objectid
, start
, 0);
1456 if (path
->slots
[0] == 0)
1461 item
= btrfs_item_ptr(btrfs_buffer_leaf(path
->nodes
[0]), path
->slots
[0],
1462 struct btrfs_file_extent_item
);
1463 leaf
= btrfs_buffer_leaf(path
->nodes
[0]);
1464 blocknr
= btrfs_file_extent_disk_blocknr(item
);
1465 blocknr
+= btrfs_file_extent_offset(item
);
1467 /* are we inside the extent that was found? */
1468 found_key
= &leaf
->items
[path
->slots
[0]].key
;
1469 found_type
= btrfs_disk_key_type(found_key
);
1470 if (btrfs_disk_key_objectid(found_key
) != objectid
||
1471 found_type
!= BTRFS_EXTENT_DATA_KEY
) {
1475 found_type
= btrfs_file_extent_type(item
);
1476 extent_start
= btrfs_disk_key_offset(&leaf
->items
[path
->slots
[0]].key
);
1477 if (found_type
== BTRFS_FILE_EXTENT_REG
) {
1478 extent_end
= extent_start
+
1479 (btrfs_file_extent_num_blocks(item
) << inode
->i_blkbits
);
1481 if (start
< extent_start
|| start
>= extent_end
) {
1483 if (start
< extent_start
) {
1484 if (end
< extent_start
)
1486 em
->end
= extent_end
- 1;
1492 if (btrfs_file_extent_disk_blocknr(item
) == 0) {
1493 em
->start
= extent_start
;
1494 em
->end
= extent_end
- 1;
1495 em
->block_start
= 0;
1499 em
->block_start
= blocknr
<< inode
->i_blkbits
;
1500 em
->block_end
= em
->block_start
+
1501 (btrfs_file_extent_num_blocks(item
) <<
1502 inode
->i_blkbits
) - 1;
1503 em
->start
= extent_start
;
1504 em
->end
= extent_end
- 1;
1506 } else if (found_type
== BTRFS_FILE_EXTENT_INLINE
) {
1511 size
= btrfs_file_extent_inline_len(leaf
->items
+
1513 extent_end
= extent_start
+ size
;
1514 if (start
< extent_start
|| start
>= extent_end
) {
1516 if (start
< extent_start
) {
1517 if (end
< extent_start
)
1519 em
->end
= extent_end
- 1;
1525 em
->block_start
= EXTENT_MAP_INLINE
;
1526 em
->block_end
= EXTENT_MAP_INLINE
;
1527 em
->start
= extent_start
;
1528 em
->end
= extent_end
- 1;
1532 ptr
= btrfs_file_extent_inline_start(item
);
1534 memcpy(map
+ page_offset
, ptr
, size
);
1535 flush_dcache_page(result
->b_page
);
1537 set_extent_uptodate(em_tree
, extent_start
,
1538 extent_end
- 1, GFP_NOFS
);
1541 printk("unkknown found_type %d\n", found_type
);
1548 em
->block_start
= 0;
1551 btrfs_release_path(root
, path
);
1552 if (em
->start
> start
|| em
->end
< start
) {
1553 printk("bad extent! em: [%Lu %Lu] passed [%Lu %Lu]\n", em
->start
, em
->end
, start
, end
);
1557 ret
= add_extent_mapping(em_tree
, em
);
1558 if (ret
== -EEXIST
) {
1559 free_extent_map(em
);
1562 if (failed_insert
> 5) {
1563 printk("failing to insert %Lu %Lu\n", start
, end
);
1571 btrfs_free_path(path
);
1573 ret
= btrfs_end_transaction(trans
, root
);
1577 mutex_unlock(&root
->fs_info
->fs_mutex
);
1579 free_extent_map(em
);
1581 return ERR_PTR(err
);
1586 static sector_t
btrfs_bmap(struct address_space
*mapping
, sector_t iblock
)
1588 return extent_bmap(mapping
, iblock
, btrfs_get_extent
);
1591 static int btrfs_prepare_write(struct file
*file
, struct page
*page
,
1592 unsigned from
, unsigned to
)
1594 return extent_prepare_write(&BTRFS_I(page
->mapping
->host
)->extent_tree
,
1595 page
->mapping
->host
, page
, from
, to
,
1599 int btrfs_readpage(struct file
*file
, struct page
*page
)
1601 struct extent_map_tree
*tree
;
1602 tree
= &BTRFS_I(page
->mapping
->host
)->extent_tree
;
1603 return extent_read_full_page(tree
, page
, btrfs_get_extent
);
1605 static int btrfs_writepage(struct page
*page
, struct writeback_control
*wbc
)
1607 struct extent_map_tree
*tree
;
1610 if (current
->flags
& PF_MEMALLOC
) {
1611 redirty_page_for_writepage(wbc
, page
);
1615 tree
= &BTRFS_I(page
->mapping
->host
)->extent_tree
;
1616 return extent_write_full_page(tree
, page
, btrfs_get_extent
, wbc
);
1619 static int btrfs_releasepage(struct page
*page
, gfp_t unused_gfp_flags
)
1621 struct extent_map_tree
*tree
;
1624 if (page
->private != 1) {
1626 return try_to_free_buffers(page
);
1628 tree
= &BTRFS_I(page
->mapping
->host
)->extent_tree
;
1629 ret
= try_release_extent_mapping(tree
, page
);
1631 ClearPagePrivate(page
);
1632 set_page_private(page
, 0);
1633 page_cache_release(page
);
1638 static void btrfs_invalidatepage(struct page
*page
, unsigned long offset
)
1640 struct extent_map_tree
*tree
;
1642 tree
= &BTRFS_I(page
->mapping
->host
)->extent_tree
;
1643 extent_invalidatepage(tree
, page
, offset
);
1644 btrfs_releasepage(page
, GFP_NOFS
);
1648 * btrfs_page_mkwrite() is not allowed to change the file size as it gets
1649 * called from a page fault handler when a page is first dirtied. Hence we must
1650 * be careful to check for EOF conditions here. We set the page up correctly
1651 * for a written page which means we get ENOSPC checking when writing into
1652 * holes and correct delalloc and unwritten extent mapping on filesystems that
1653 * support these features.
1655 * We are not allowed to take the i_mutex here so we have to play games to
1656 * protect against truncate races as the page could now be beyond EOF. Because
1657 * vmtruncate() writes the inode size before removing pages, once we have the
1658 * page lock we can determine safely if the page is beyond EOF. If it is not
1659 * beyond EOF, then the page is guaranteed safe against truncation until we
1662 int btrfs_page_mkwrite(struct vm_area_struct
*vma
, struct page
*page
)
1664 struct inode
*inode
= vma
->vm_file
->f_path
.dentry
->d_inode
;
1670 down_read(&BTRFS_I(inode
)->root
->snap_sem
);
1672 wait_on_page_writeback(page
);
1673 size
= i_size_read(inode
);
1674 page_start
= page
->index
<< PAGE_CACHE_SHIFT
;
1676 if ((page
->mapping
!= inode
->i_mapping
) ||
1677 (page_start
> size
)) {
1678 /* page got truncated out from underneath us */
1682 /* page is wholly or partially inside EOF */
1683 if (page_start
+ PAGE_CACHE_SIZE
> size
)
1684 end
= size
& ~PAGE_CACHE_MASK
;
1686 end
= PAGE_CACHE_SIZE
;
1688 ret
= btrfs_cow_one_page(inode
, page
, end
);
1691 up_read(&BTRFS_I(inode
)->root
->snap_sem
);
1696 static void btrfs_truncate(struct inode
*inode
)
1698 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1700 struct btrfs_trans_handle
*trans
;
1703 if (!S_ISREG(inode
->i_mode
))
1705 if (IS_APPEND(inode
) || IS_IMMUTABLE(inode
))
1708 btrfs_truncate_page(inode
->i_mapping
, inode
->i_size
);
1710 mutex_lock(&root
->fs_info
->fs_mutex
);
1711 trans
= btrfs_start_transaction(root
, 1);
1712 btrfs_set_trans_block_group(trans
, inode
);
1714 /* FIXME, add redo link to tree so we don't leak on crash */
1715 ret
= btrfs_truncate_in_trans(trans
, root
, inode
);
1716 btrfs_update_inode(trans
, root
, inode
);
1717 nr
= trans
->blocks_used
;
1718 ret
= btrfs_end_transaction(trans
, root
);
1720 mutex_unlock(&root
->fs_info
->fs_mutex
);
1721 btrfs_btree_balance_dirty(root
, nr
);
1724 int btrfs_commit_write(struct file
*file
, struct page
*page
,
1725 unsigned from
, unsigned to
)
1727 return extent_commit_write(&BTRFS_I(page
->mapping
->host
)->extent_tree
,
1728 page
->mapping
->host
, page
, from
, to
);
1731 static int create_subvol(struct btrfs_root
*root
, char *name
, int namelen
)
1733 struct btrfs_trans_handle
*trans
;
1734 struct btrfs_key key
;
1735 struct btrfs_root_item root_item
;
1736 struct btrfs_inode_item
*inode_item
;
1737 struct buffer_head
*subvol
;
1738 struct btrfs_leaf
*leaf
;
1739 struct btrfs_root
*new_root
;
1740 struct inode
*inode
;
1745 u64 new_dirid
= BTRFS_FIRST_FREE_OBJECTID
;
1746 unsigned long nr
= 1;
1748 mutex_lock(&root
->fs_info
->fs_mutex
);
1749 trans
= btrfs_start_transaction(root
, 1);
1752 subvol
= btrfs_alloc_free_block(trans
, root
, 0, 0);
1754 return PTR_ERR(subvol
);
1755 leaf
= btrfs_buffer_leaf(subvol
);
1756 btrfs_set_header_nritems(&leaf
->header
, 0);
1757 btrfs_set_header_level(&leaf
->header
, 0);
1758 btrfs_set_header_blocknr(&leaf
->header
, bh_blocknr(subvol
));
1759 btrfs_set_header_generation(&leaf
->header
, trans
->transid
);
1760 btrfs_set_header_owner(&leaf
->header
, root
->root_key
.objectid
);
1761 memcpy(leaf
->header
.fsid
, root
->fs_info
->disk_super
->fsid
,
1762 sizeof(leaf
->header
.fsid
));
1763 btrfs_mark_buffer_dirty(subvol
);
1765 inode_item
= &root_item
.inode
;
1766 memset(inode_item
, 0, sizeof(*inode_item
));
1767 btrfs_set_inode_generation(inode_item
, 1);
1768 btrfs_set_inode_size(inode_item
, 3);
1769 btrfs_set_inode_nlink(inode_item
, 1);
1770 btrfs_set_inode_nblocks(inode_item
, 1);
1771 btrfs_set_inode_mode(inode_item
, S_IFDIR
| 0755);
1773 btrfs_set_root_blocknr(&root_item
, bh_blocknr(subvol
));
1774 btrfs_set_root_refs(&root_item
, 1);
1775 btrfs_set_root_blocks_used(&root_item
, 0);
1776 memset(&root_item
.drop_progress
, 0, sizeof(root_item
.drop_progress
));
1777 root_item
.drop_level
= 0;
1781 ret
= btrfs_find_free_objectid(trans
, root
->fs_info
->tree_root
,
1786 btrfs_set_root_dirid(&root_item
, new_dirid
);
1788 key
.objectid
= objectid
;
1791 btrfs_set_key_type(&key
, BTRFS_ROOT_ITEM_KEY
);
1792 ret
= btrfs_insert_root(trans
, root
->fs_info
->tree_root
, &key
,
1798 * insert the directory item
1800 key
.offset
= (u64
)-1;
1801 dir
= root
->fs_info
->sb
->s_root
->d_inode
;
1802 ret
= btrfs_insert_dir_item(trans
, root
->fs_info
->tree_root
,
1803 name
, namelen
, dir
->i_ino
, &key
,
1808 ret
= btrfs_commit_transaction(trans
, root
);
1812 new_root
= btrfs_read_fs_root(root
->fs_info
, &key
, name
, namelen
);
1815 trans
= btrfs_start_transaction(new_root
, 1);
1818 inode
= btrfs_new_inode(trans
, new_root
, new_dirid
,
1819 BTRFS_I(dir
)->block_group
, S_IFDIR
| 0700);
1822 inode
->i_op
= &btrfs_dir_inode_operations
;
1823 inode
->i_fop
= &btrfs_dir_file_operations
;
1824 new_root
->inode
= inode
;
1826 ret
= btrfs_make_empty_dir(trans
, new_root
, new_dirid
, new_dirid
);
1832 ret
= btrfs_update_inode(trans
, new_root
, inode
);
1836 nr
= trans
->blocks_used
;
1837 err
= btrfs_commit_transaction(trans
, root
);
1841 mutex_unlock(&root
->fs_info
->fs_mutex
);
1842 btrfs_btree_balance_dirty(root
, nr
);
1846 static int create_snapshot(struct btrfs_root
*root
, char *name
, int namelen
)
1848 struct btrfs_trans_handle
*trans
;
1849 struct btrfs_key key
;
1850 struct btrfs_root_item new_root_item
;
1851 struct buffer_head
*tmp
;
1857 if (!root
->ref_cows
)
1860 down_write(&root
->snap_sem
);
1861 freeze_bdev(root
->fs_info
->sb
->s_bdev
);
1862 thaw_bdev(root
->fs_info
->sb
->s_bdev
, root
->fs_info
->sb
);
1864 mutex_lock(&root
->fs_info
->fs_mutex
);
1865 trans
= btrfs_start_transaction(root
, 1);
1868 ret
= btrfs_update_inode(trans
, root
, root
->inode
);
1872 ret
= btrfs_find_free_objectid(trans
, root
->fs_info
->tree_root
,
1877 memcpy(&new_root_item
, &root
->root_item
,
1878 sizeof(new_root_item
));
1880 key
.objectid
= objectid
;
1883 btrfs_set_key_type(&key
, BTRFS_ROOT_ITEM_KEY
);
1884 btrfs_cow_block(trans
, root
, root
->node
, NULL
, 0, &tmp
);
1885 btrfs_set_root_blocknr(&new_root_item
, bh_blocknr(root
->node
));
1887 ret
= btrfs_insert_root(trans
, root
->fs_info
->tree_root
, &key
,
1893 * insert the directory item
1895 key
.offset
= (u64
)-1;
1896 ret
= btrfs_insert_dir_item(trans
, root
->fs_info
->tree_root
,
1898 root
->fs_info
->sb
->s_root
->d_inode
->i_ino
,
1899 &key
, BTRFS_FT_DIR
);
1904 ret
= btrfs_inc_root_ref(trans
, root
);
1908 nr
= trans
->blocks_used
;
1909 err
= btrfs_commit_transaction(trans
, root
);
1912 mutex_unlock(&root
->fs_info
->fs_mutex
);
1913 up_write(&root
->snap_sem
);
1914 btrfs_btree_balance_dirty(root
, nr
);
1918 static unsigned long force_ra(struct address_space
*mapping
,
1919 struct file_ra_state
*ra
, struct file
*file
,
1920 pgoff_t offset
, pgoff_t last_index
)
1924 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23)
1925 req_size
= last_index
- offset
+ 1;
1926 offset
= page_cache_readahead(mapping
, ra
, file
, offset
, req_size
);
1929 req_size
= min(last_index
- offset
+ 1, (pgoff_t
)128);
1930 page_cache_sync_readahead(mapping
, ra
, file
, offset
, req_size
);
1931 return offset
+ req_size
;
1935 int btrfs_defrag_file(struct file
*file
) {
1936 struct inode
*inode
= file
->f_path
.dentry
->d_inode
;
1937 struct extent_map_tree
*em_tree
= &BTRFS_I(inode
)->extent_tree
;
1939 unsigned long last_index
;
1940 unsigned long ra_index
= 0;
1945 mutex_lock(&inode
->i_mutex
);
1946 last_index
= inode
->i_size
>> PAGE_CACHE_SHIFT
;
1947 for (i
= 0; i
<= last_index
; i
++) {
1948 if (i
== ra_index
) {
1949 ra_index
= force_ra(inode
->i_mapping
, &file
->f_ra
,
1950 file
, ra_index
, last_index
);
1952 page
= grab_cache_page(inode
->i_mapping
, i
);
1955 if (!PageUptodate(page
)) {
1956 btrfs_readpage(NULL
, page
);
1958 if (!PageUptodate(page
)) {
1960 page_cache_release(page
);
1964 page_start
= page
->index
<< PAGE_CACHE_SHIFT
;
1965 page_end
= page_start
+ PAGE_CACHE_SIZE
- 1;
1967 lock_extent(em_tree
, page_start
, page_end
, GFP_NOFS
);
1968 set_extent_delalloc(em_tree
, page_start
,
1969 page_end
, GFP_NOFS
);
1970 unlock_extent(em_tree
, page_start
, page_end
, GFP_NOFS
);
1971 set_page_dirty(page
);
1973 page_cache_release(page
);
1974 balance_dirty_pages_ratelimited_nr(inode
->i_mapping
, 1);
1978 mutex_unlock(&inode
->i_mutex
);
1982 static int btrfs_ioctl_snap_create(struct btrfs_root
*root
, void __user
*arg
)
1984 struct btrfs_ioctl_vol_args vol_args
;
1985 struct btrfs_dir_item
*di
;
1986 struct btrfs_path
*path
;
1990 if (copy_from_user(&vol_args
, arg
, sizeof(vol_args
)))
1993 namelen
= strlen(vol_args
.name
);
1994 if (namelen
> BTRFS_VOL_NAME_MAX
)
1996 if (strchr(vol_args
.name
, '/'))
1999 path
= btrfs_alloc_path();
2003 root_dirid
= root
->fs_info
->sb
->s_root
->d_inode
->i_ino
,
2004 mutex_lock(&root
->fs_info
->fs_mutex
);
2005 di
= btrfs_lookup_dir_item(NULL
, root
->fs_info
->tree_root
,
2007 vol_args
.name
, namelen
, 0);
2008 mutex_unlock(&root
->fs_info
->fs_mutex
);
2009 btrfs_free_path(path
);
2010 if (di
&& !IS_ERR(di
))
2015 if (root
== root
->fs_info
->tree_root
)
2016 return create_subvol(root
, vol_args
.name
, namelen
);
2017 return create_snapshot(root
, vol_args
.name
, namelen
);
2020 static int btrfs_ioctl_defrag(struct file
*file
)
2022 struct inode
*inode
= file
->f_path
.dentry
->d_inode
;
2023 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
2025 switch (inode
->i_mode
& S_IFMT
) {
2027 mutex_lock(&root
->fs_info
->fs_mutex
);
2028 btrfs_defrag_root(root
, 0);
2029 btrfs_defrag_root(root
->fs_info
->extent_root
, 0);
2030 mutex_unlock(&root
->fs_info
->fs_mutex
);
2033 btrfs_defrag_file(file
);
2040 long btrfs_ioctl(struct file
*file
, unsigned int
2041 cmd
, unsigned long arg
)
2043 struct btrfs_root
*root
= BTRFS_I(file
->f_path
.dentry
->d_inode
)->root
;
2046 case BTRFS_IOC_SNAP_CREATE
:
2047 return btrfs_ioctl_snap_create(root
, (void __user
*)arg
);
2048 case BTRFS_IOC_DEFRAG
:
2049 return btrfs_ioctl_defrag(file
);
2056 * Called inside transaction, so use GFP_NOFS
2058 struct inode
*btrfs_alloc_inode(struct super_block
*sb
)
2060 struct btrfs_inode
*ei
;
2062 ei
= kmem_cache_alloc(btrfs_inode_cachep
, GFP_NOFS
);
2066 return &ei
->vfs_inode
;
2069 void btrfs_destroy_inode(struct inode
*inode
)
2071 WARN_ON(!list_empty(&inode
->i_dentry
));
2072 WARN_ON(inode
->i_data
.nrpages
);
2074 kmem_cache_free(btrfs_inode_cachep
, BTRFS_I(inode
));
2077 static void init_once(void * foo
, struct kmem_cache
* cachep
,
2078 unsigned long flags
)
2080 struct btrfs_inode
*ei
= (struct btrfs_inode
*) foo
;
2082 inode_init_once(&ei
->vfs_inode
);
2085 void btrfs_destroy_cachep(void)
2087 if (btrfs_inode_cachep
)
2088 kmem_cache_destroy(btrfs_inode_cachep
);
2089 if (btrfs_trans_handle_cachep
)
2090 kmem_cache_destroy(btrfs_trans_handle_cachep
);
2091 if (btrfs_transaction_cachep
)
2092 kmem_cache_destroy(btrfs_transaction_cachep
);
2093 if (btrfs_bit_radix_cachep
)
2094 kmem_cache_destroy(btrfs_bit_radix_cachep
);
2095 if (btrfs_path_cachep
)
2096 kmem_cache_destroy(btrfs_path_cachep
);
2099 struct kmem_cache
*btrfs_cache_create(const char *name
, size_t size
,
2100 unsigned long extra_flags
,
2101 void (*ctor
)(void *, struct kmem_cache
*,
2104 return kmem_cache_create(name
, size
, 0, (SLAB_RECLAIM_ACCOUNT
|
2105 SLAB_MEM_SPREAD
| extra_flags
), ctor
2106 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23)
2112 int btrfs_init_cachep(void)
2114 btrfs_inode_cachep
= btrfs_cache_create("btrfs_inode_cache",
2115 sizeof(struct btrfs_inode
),
2117 if (!btrfs_inode_cachep
)
2119 btrfs_trans_handle_cachep
=
2120 btrfs_cache_create("btrfs_trans_handle_cache",
2121 sizeof(struct btrfs_trans_handle
),
2123 if (!btrfs_trans_handle_cachep
)
2125 btrfs_transaction_cachep
= btrfs_cache_create("btrfs_transaction_cache",
2126 sizeof(struct btrfs_transaction
),
2128 if (!btrfs_transaction_cachep
)
2130 btrfs_path_cachep
= btrfs_cache_create("btrfs_path_cache",
2131 sizeof(struct btrfs_path
),
2133 if (!btrfs_path_cachep
)
2135 btrfs_bit_radix_cachep
= btrfs_cache_create("btrfs_radix", 256,
2136 SLAB_DESTROY_BY_RCU
, NULL
);
2137 if (!btrfs_bit_radix_cachep
)
2141 btrfs_destroy_cachep();
2145 static int btrfs_getattr(struct vfsmount
*mnt
,
2146 struct dentry
*dentry
, struct kstat
*stat
)
2148 struct inode
*inode
= dentry
->d_inode
;
2149 generic_fillattr(inode
, stat
);
2150 stat
->blksize
= 256 * 1024;
2154 static int btrfs_rename(struct inode
* old_dir
, struct dentry
*old_dentry
,
2155 struct inode
* new_dir
,struct dentry
*new_dentry
)
2157 struct btrfs_trans_handle
*trans
;
2158 struct btrfs_root
*root
= BTRFS_I(old_dir
)->root
;
2159 struct inode
*new_inode
= new_dentry
->d_inode
;
2160 struct inode
*old_inode
= old_dentry
->d_inode
;
2161 struct timespec ctime
= CURRENT_TIME
;
2162 struct btrfs_path
*path
;
2163 struct btrfs_dir_item
*di
;
2166 if (S_ISDIR(old_inode
->i_mode
) && new_inode
&&
2167 new_inode
->i_size
> BTRFS_EMPTY_DIR_SIZE
) {
2170 mutex_lock(&root
->fs_info
->fs_mutex
);
2171 trans
= btrfs_start_transaction(root
, 1);
2172 btrfs_set_trans_block_group(trans
, new_dir
);
2173 path
= btrfs_alloc_path();
2179 old_dentry
->d_inode
->i_nlink
++;
2180 old_dir
->i_ctime
= old_dir
->i_mtime
= ctime
;
2181 new_dir
->i_ctime
= new_dir
->i_mtime
= ctime
;
2182 old_inode
->i_ctime
= ctime
;
2183 if (S_ISDIR(old_inode
->i_mode
) && old_dir
!= new_dir
) {
2184 struct btrfs_key
*location
= &BTRFS_I(new_dir
)->location
;
2186 di
= btrfs_lookup_dir_item(trans
, root
, path
, old_inode
->i_ino
,
2196 old_parent_oid
= btrfs_disk_key_objectid(&di
->location
);
2197 ret
= btrfs_del_item(trans
, root
, path
);
2201 btrfs_release_path(root
, path
);
2203 di
= btrfs_lookup_dir_index_item(trans
, root
, path
,
2215 ret
= btrfs_del_item(trans
, root
, path
);
2219 btrfs_release_path(root
, path
);
2221 ret
= btrfs_insert_dir_item(trans
, root
, "..", 2,
2222 old_inode
->i_ino
, location
,
2229 ret
= btrfs_unlink_trans(trans
, root
, old_dir
, old_dentry
);
2234 new_inode
->i_ctime
= CURRENT_TIME
;
2235 ret
= btrfs_unlink_trans(trans
, root
, new_dir
, new_dentry
);
2239 ret
= btrfs_add_link(trans
, new_dentry
, old_inode
);
2244 btrfs_free_path(path
);
2245 btrfs_end_transaction(trans
, root
);
2246 mutex_unlock(&root
->fs_info
->fs_mutex
);
2250 static int btrfs_symlink(struct inode
*dir
, struct dentry
*dentry
,
2251 const char *symname
)
2253 struct btrfs_trans_handle
*trans
;
2254 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
2255 struct btrfs_path
*path
;
2256 struct btrfs_key key
;
2257 struct inode
*inode
;
2264 struct btrfs_file_extent_item
*ei
;
2267 name_len
= strlen(symname
) + 1;
2268 if (name_len
> BTRFS_MAX_INLINE_DATA_SIZE(root
))
2269 return -ENAMETOOLONG
;
2270 mutex_lock(&root
->fs_info
->fs_mutex
);
2271 trans
= btrfs_start_transaction(root
, 1);
2272 btrfs_set_trans_block_group(trans
, dir
);
2274 err
= btrfs_find_free_objectid(trans
, root
, dir
->i_ino
, &objectid
);
2280 inode
= btrfs_new_inode(trans
, root
, objectid
,
2281 BTRFS_I(dir
)->block_group
, S_IFLNK
|S_IRWXUGO
);
2282 err
= PTR_ERR(inode
);
2286 btrfs_set_trans_block_group(trans
, inode
);
2287 err
= btrfs_add_nondir(trans
, dentry
, inode
);
2291 inode
->i_mapping
->a_ops
= &btrfs_aops
;
2292 inode
->i_fop
= &btrfs_file_operations
;
2293 inode
->i_op
= &btrfs_file_inode_operations
;
2294 extent_map_tree_init(&BTRFS_I(inode
)->extent_tree
,
2295 inode
->i_mapping
, GFP_NOFS
);
2296 BTRFS_I(inode
)->extent_tree
.ops
= &btrfs_extent_map_ops
;
2298 dir
->i_sb
->s_dirt
= 1;
2299 btrfs_update_inode_block_group(trans
, inode
);
2300 btrfs_update_inode_block_group(trans
, dir
);
2304 path
= btrfs_alloc_path();
2306 key
.objectid
= inode
->i_ino
;
2309 btrfs_set_key_type(&key
, BTRFS_EXTENT_DATA_KEY
);
2310 datasize
= btrfs_file_extent_calc_inline_size(name_len
);
2311 err
= btrfs_insert_empty_item(trans
, root
, path
, &key
,
2317 ei
= btrfs_item_ptr(btrfs_buffer_leaf(path
->nodes
[0]),
2318 path
->slots
[0], struct btrfs_file_extent_item
);
2319 btrfs_set_file_extent_generation(ei
, trans
->transid
);
2320 btrfs_set_file_extent_type(ei
,
2321 BTRFS_FILE_EXTENT_INLINE
);
2322 ptr
= btrfs_file_extent_inline_start(ei
);
2323 btrfs_memcpy(root
, path
->nodes
[0]->b_data
,
2324 ptr
, symname
, name_len
);
2325 btrfs_mark_buffer_dirty(path
->nodes
[0]);
2326 btrfs_free_path(path
);
2327 inode
->i_op
= &btrfs_symlink_inode_operations
;
2328 inode
->i_mapping
->a_ops
= &btrfs_symlink_aops
;
2329 inode
->i_size
= name_len
- 1;
2330 err
= btrfs_update_inode(trans
, root
, inode
);
2335 nr
= trans
->blocks_used
;
2336 btrfs_end_transaction(trans
, root
);
2337 mutex_unlock(&root
->fs_info
->fs_mutex
);
2339 inode_dec_link_count(inode
);
2342 btrfs_btree_balance_dirty(root
, nr
);
2346 static struct inode_operations btrfs_dir_inode_operations
= {
2347 .lookup
= btrfs_lookup
,
2348 .create
= btrfs_create
,
2349 .unlink
= btrfs_unlink
,
2351 .mkdir
= btrfs_mkdir
,
2352 .rmdir
= btrfs_rmdir
,
2353 .rename
= btrfs_rename
,
2354 .symlink
= btrfs_symlink
,
2355 .setattr
= btrfs_setattr
,
2356 .mknod
= btrfs_mknod
,
2359 static struct inode_operations btrfs_dir_ro_inode_operations
= {
2360 .lookup
= btrfs_lookup
,
2363 static struct file_operations btrfs_dir_file_operations
= {
2364 .llseek
= generic_file_llseek
,
2365 .read
= generic_read_dir
,
2366 .readdir
= btrfs_readdir
,
2367 .unlocked_ioctl
= btrfs_ioctl
,
2368 #ifdef CONFIG_COMPAT
2369 .compat_ioctl
= btrfs_ioctl
,
2373 static struct extent_map_ops btrfs_extent_map_ops
= {
2374 .fill_delalloc
= run_delalloc_range
,
2375 .writepage_io_hook
= btrfs_writepage_io_hook
,
2376 .readpage_io_hook
= btrfs_readpage_io_hook
,
2377 .readpage_end_io_hook
= btrfs_readpage_end_io_hook
,
2380 static struct address_space_operations btrfs_aops
= {
2381 .readpage
= btrfs_readpage
,
2382 .writepage
= btrfs_writepage
,
2383 .sync_page
= block_sync_page
,
2384 .prepare_write
= btrfs_prepare_write
,
2385 .commit_write
= btrfs_commit_write
,
2387 .invalidatepage
= btrfs_invalidatepage
,
2388 .releasepage
= btrfs_releasepage
,
2389 .set_page_dirty
= __set_page_dirty_nobuffers
,
2392 static struct address_space_operations btrfs_symlink_aops
= {
2393 .readpage
= btrfs_readpage
,
2394 .writepage
= btrfs_writepage
,
2395 .invalidatepage
= btrfs_invalidatepage
,
2396 .releasepage
= btrfs_releasepage
,
2399 static struct inode_operations btrfs_file_inode_operations
= {
2400 .truncate
= btrfs_truncate
,
2401 .getattr
= btrfs_getattr
,
2402 .setattr
= btrfs_setattr
,
2405 static struct inode_operations btrfs_special_inode_operations
= {
2406 .getattr
= btrfs_getattr
,
2407 .setattr
= btrfs_setattr
,
2410 static struct inode_operations btrfs_symlink_inode_operations
= {
2411 .readlink
= generic_readlink
,
2412 .follow_link
= page_follow_link_light
,
2413 .put_link
= page_put_link
,