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
= root
->sectorsize
;
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_bytes
= (end
- start
+ blocksize
) & ~(blocksize
- 1);
89 ret
= btrfs_drop_extents(trans
, root
, inode
,
90 start
, start
+ num_bytes
, start
, &alloc_hint
);
92 if (alloc_hint
== EXTENT_MAP_INLINE
)
95 ret
= btrfs_alloc_extent(trans
, root
, inode
->i_ino
, num_bytes
, 0,
96 alloc_hint
, (u64
)-1, &ins
, 1);
101 ret
= btrfs_insert_file_extent(trans
, root
, inode
->i_ino
,
102 start
, ins
.objectid
, ins
.offset
,
105 btrfs_end_transaction(trans
, root
);
106 mutex_unlock(&root
->fs_info
->fs_mutex
);
110 int btrfs_writepage_io_hook(struct page
*page
, u64 start
, u64 end
)
112 struct inode
*inode
= page
->mapping
->host
;
113 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
114 struct btrfs_trans_handle
*trans
;
117 u64 page_start
= (u64
)page
->index
<< PAGE_CACHE_SHIFT
;
118 size_t offset
= start
- page_start
;
120 mutex_lock(&root
->fs_info
->fs_mutex
);
121 trans
= btrfs_start_transaction(root
, 1);
122 btrfs_set_trans_block_group(trans
, inode
);
124 btrfs_csum_file_block(trans
, root
, inode
, inode
->i_ino
,
125 start
, kaddr
+ offset
, end
- start
+ 1);
127 ret
= btrfs_end_transaction(trans
, root
);
129 mutex_unlock(&root
->fs_info
->fs_mutex
);
133 int btrfs_readpage_io_hook(struct page
*page
, u64 start
, u64 end
)
136 struct inode
*inode
= page
->mapping
->host
;
137 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
138 struct extent_map_tree
*em_tree
= &BTRFS_I(inode
)->extent_tree
;
139 struct btrfs_csum_item
*item
;
140 struct btrfs_path
*path
= NULL
;
143 mutex_lock(&root
->fs_info
->fs_mutex
);
144 path
= btrfs_alloc_path();
145 item
= btrfs_lookup_csum(NULL
, root
, path
, inode
->i_ino
, start
, 0);
148 /* a csum that isn't present is a preallocated region. */
149 if (ret
== -ENOENT
|| ret
== -EFBIG
)
154 read_extent_buffer(path
->nodes
[0], &csum
, (unsigned long)item
,
156 set_state_private(em_tree
, start
, csum
);
159 btrfs_free_path(path
);
160 mutex_unlock(&root
->fs_info
->fs_mutex
);
164 int btrfs_readpage_end_io_hook(struct page
*page
, u64 start
, u64 end
)
166 size_t offset
= start
- ((u64
)page
->index
<< PAGE_CACHE_SHIFT
);
167 struct inode
*inode
= page
->mapping
->host
;
168 struct extent_map_tree
*em_tree
= &BTRFS_I(inode
)->extent_tree
;
172 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
176 ret
= get_state_private(em_tree
, start
, &private);
177 local_irq_save(flags
);
178 kaddr
= kmap_atomic(page
, KM_IRQ0
);
182 csum
= btrfs_csum_data(root
, kaddr
+ offset
, csum
, end
- start
+ 1);
183 btrfs_csum_final(csum
, (char *)&csum
);
184 if (csum
!= private) {
187 kunmap_atomic(kaddr
, KM_IRQ0
);
188 local_irq_restore(flags
);
192 printk("btrfs csum failed ino %lu off %llu\n",
193 page
->mapping
->host
->i_ino
, (unsigned long long)start
);
194 memset(kaddr
+ offset
, 1, end
- start
+ 1);
195 flush_dcache_page(page
);
196 kunmap_atomic(kaddr
, KM_IRQ0
);
197 local_irq_restore(flags
);
201 void btrfs_read_locked_inode(struct inode
*inode
)
203 struct btrfs_path
*path
;
204 struct extent_buffer
*leaf
;
205 struct btrfs_inode_item
*inode_item
;
206 struct btrfs_inode_timespec
*tspec
;
207 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
208 struct btrfs_key location
;
209 u64 alloc_group_block
;
213 path
= btrfs_alloc_path();
215 mutex_lock(&root
->fs_info
->fs_mutex
);
217 memcpy(&location
, &BTRFS_I(inode
)->location
, sizeof(location
));
218 ret
= btrfs_lookup_inode(NULL
, root
, path
, &location
, 0);
222 leaf
= path
->nodes
[0];
223 inode_item
= btrfs_item_ptr(leaf
, path
->slots
[0],
224 struct btrfs_inode_item
);
226 inode
->i_mode
= btrfs_inode_mode(leaf
, inode_item
);
227 inode
->i_nlink
= btrfs_inode_nlink(leaf
, inode_item
);
228 inode
->i_uid
= btrfs_inode_uid(leaf
, inode_item
);
229 inode
->i_gid
= btrfs_inode_gid(leaf
, inode_item
);
230 inode
->i_size
= btrfs_inode_size(leaf
, inode_item
);
232 tspec
= btrfs_inode_atime(inode_item
);
233 inode
->i_atime
.tv_sec
= btrfs_timespec_sec(leaf
, tspec
);
234 inode
->i_atime
.tv_nsec
= btrfs_timespec_nsec(leaf
, tspec
);
236 tspec
= btrfs_inode_mtime(inode_item
);
237 inode
->i_mtime
.tv_sec
= btrfs_timespec_sec(leaf
, tspec
);
238 inode
->i_mtime
.tv_nsec
= btrfs_timespec_nsec(leaf
, tspec
);
240 tspec
= btrfs_inode_ctime(inode_item
);
241 inode
->i_ctime
.tv_sec
= btrfs_timespec_sec(leaf
, tspec
);
242 inode
->i_ctime
.tv_nsec
= btrfs_timespec_nsec(leaf
, tspec
);
244 inode
->i_blocks
= btrfs_inode_nblocks(leaf
, inode_item
);
245 inode
->i_generation
= btrfs_inode_generation(leaf
, inode_item
);
247 rdev
= btrfs_inode_rdev(leaf
, inode_item
);
249 alloc_group_block
= btrfs_inode_block_group(leaf
, inode_item
);
250 BTRFS_I(inode
)->block_group
= btrfs_lookup_block_group(root
->fs_info
,
253 btrfs_free_path(path
);
256 mutex_unlock(&root
->fs_info
->fs_mutex
);
258 switch (inode
->i_mode
& S_IFMT
) {
260 inode
->i_mapping
->a_ops
= &btrfs_aops
;
261 BTRFS_I(inode
)->extent_tree
.ops
= &btrfs_extent_map_ops
;
262 inode
->i_fop
= &btrfs_file_operations
;
263 inode
->i_op
= &btrfs_file_inode_operations
;
266 inode
->i_fop
= &btrfs_dir_file_operations
;
267 if (root
== root
->fs_info
->tree_root
)
268 inode
->i_op
= &btrfs_dir_ro_inode_operations
;
270 inode
->i_op
= &btrfs_dir_inode_operations
;
273 inode
->i_op
= &btrfs_symlink_inode_operations
;
274 inode
->i_mapping
->a_ops
= &btrfs_symlink_aops
;
277 init_special_inode(inode
, inode
->i_mode
, rdev
);
283 btrfs_release_path(root
, path
);
284 btrfs_free_path(path
);
285 mutex_unlock(&root
->fs_info
->fs_mutex
);
286 make_bad_inode(inode
);
289 static void fill_inode_item(struct extent_buffer
*leaf
,
290 struct btrfs_inode_item
*item
,
293 btrfs_set_inode_uid(leaf
, item
, inode
->i_uid
);
294 btrfs_set_inode_gid(leaf
, item
, inode
->i_gid
);
295 btrfs_set_inode_size(leaf
, item
, inode
->i_size
);
296 btrfs_set_inode_mode(leaf
, item
, inode
->i_mode
);
297 btrfs_set_inode_nlink(leaf
, item
, inode
->i_nlink
);
299 btrfs_set_timespec_sec(leaf
, btrfs_inode_atime(item
),
300 inode
->i_atime
.tv_sec
);
301 btrfs_set_timespec_nsec(leaf
, btrfs_inode_atime(item
),
302 inode
->i_atime
.tv_nsec
);
304 btrfs_set_timespec_sec(leaf
, btrfs_inode_mtime(item
),
305 inode
->i_mtime
.tv_sec
);
306 btrfs_set_timespec_nsec(leaf
, btrfs_inode_mtime(item
),
307 inode
->i_mtime
.tv_nsec
);
309 btrfs_set_timespec_sec(leaf
, btrfs_inode_ctime(item
),
310 inode
->i_ctime
.tv_sec
);
311 btrfs_set_timespec_nsec(leaf
, btrfs_inode_ctime(item
),
312 inode
->i_ctime
.tv_nsec
);
314 btrfs_set_inode_nblocks(leaf
, item
, inode
->i_blocks
);
315 btrfs_set_inode_generation(leaf
, item
, inode
->i_generation
);
316 btrfs_set_inode_rdev(leaf
, item
, inode
->i_rdev
);
317 btrfs_set_inode_block_group(leaf
, item
,
318 BTRFS_I(inode
)->block_group
->key
.objectid
);
321 int btrfs_update_inode(struct btrfs_trans_handle
*trans
,
322 struct btrfs_root
*root
,
325 struct btrfs_inode_item
*inode_item
;
326 struct btrfs_path
*path
;
327 struct extent_buffer
*leaf
;
330 path
= btrfs_alloc_path();
332 ret
= btrfs_lookup_inode(trans
, root
, path
,
333 &BTRFS_I(inode
)->location
, 1);
340 leaf
= path
->nodes
[0];
341 inode_item
= btrfs_item_ptr(leaf
, path
->slots
[0],
342 struct btrfs_inode_item
);
344 fill_inode_item(leaf
, inode_item
, inode
);
345 btrfs_mark_buffer_dirty(leaf
);
346 btrfs_set_inode_last_trans(trans
, inode
);
349 btrfs_release_path(root
, path
);
350 btrfs_free_path(path
);
355 static int btrfs_unlink_trans(struct btrfs_trans_handle
*trans
,
356 struct btrfs_root
*root
,
358 struct dentry
*dentry
)
360 struct btrfs_path
*path
;
361 const char *name
= dentry
->d_name
.name
;
362 int name_len
= dentry
->d_name
.len
;
364 struct extent_buffer
*leaf
;
365 struct btrfs_dir_item
*di
;
366 struct btrfs_key key
;
368 path
= btrfs_alloc_path();
374 di
= btrfs_lookup_dir_item(trans
, root
, path
, dir
->i_ino
,
384 leaf
= path
->nodes
[0];
385 btrfs_dir_item_key_to_cpu(leaf
, di
, &key
);
386 ret
= btrfs_delete_one_dir_name(trans
, root
, path
, di
);
389 btrfs_release_path(root
, path
);
391 di
= btrfs_lookup_dir_index_item(trans
, root
, path
, dir
->i_ino
,
392 key
.objectid
, name
, name_len
, -1);
401 ret
= btrfs_delete_one_dir_name(trans
, root
, path
, di
);
403 dentry
->d_inode
->i_ctime
= dir
->i_ctime
;
405 btrfs_free_path(path
);
407 dir
->i_size
-= name_len
* 2;
408 dir
->i_mtime
= dir
->i_ctime
= CURRENT_TIME
;
409 btrfs_update_inode(trans
, root
, dir
);
410 drop_nlink(dentry
->d_inode
);
411 ret
= btrfs_update_inode(trans
, root
, dentry
->d_inode
);
412 dir
->i_sb
->s_dirt
= 1;
417 static int btrfs_unlink(struct inode
*dir
, struct dentry
*dentry
)
419 struct btrfs_root
*root
;
420 struct btrfs_trans_handle
*trans
;
424 root
= BTRFS_I(dir
)->root
;
425 mutex_lock(&root
->fs_info
->fs_mutex
);
426 trans
= btrfs_start_transaction(root
, 1);
428 btrfs_set_trans_block_group(trans
, dir
);
429 ret
= btrfs_unlink_trans(trans
, root
, dir
, dentry
);
430 nr
= trans
->blocks_used
;
432 btrfs_end_transaction(trans
, root
);
433 mutex_unlock(&root
->fs_info
->fs_mutex
);
434 btrfs_btree_balance_dirty(root
, nr
);
439 static int btrfs_rmdir(struct inode
*dir
, struct dentry
*dentry
)
441 struct inode
*inode
= dentry
->d_inode
;
444 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
445 struct btrfs_path
*path
;
446 struct btrfs_key key
;
447 struct btrfs_trans_handle
*trans
;
448 struct btrfs_key found_key
;
450 struct extent_buffer
*leaf
;
451 char *goodnames
= "..";
454 if (inode
->i_size
> BTRFS_EMPTY_DIR_SIZE
)
457 path
= btrfs_alloc_path();
459 mutex_lock(&root
->fs_info
->fs_mutex
);
460 trans
= btrfs_start_transaction(root
, 1);
462 btrfs_set_trans_block_group(trans
, dir
);
463 key
.objectid
= inode
->i_ino
;
464 key
.offset
= (u64
)-1;
467 ret
= btrfs_search_slot(trans
, root
, &key
, path
, -1, 1);
473 if (path
->slots
[0] == 0) {
478 leaf
= path
->nodes
[0];
479 btrfs_item_key_to_cpu(leaf
, &found_key
, path
->slots
[0]);
480 found_type
= btrfs_key_type(&found_key
);
481 if (found_key
.objectid
!= inode
->i_ino
) {
485 if ((found_type
!= BTRFS_DIR_ITEM_KEY
&&
486 found_type
!= BTRFS_DIR_INDEX_KEY
) ||
487 (!btrfs_match_dir_item_name(root
, path
, goodnames
, 2) &&
488 !btrfs_match_dir_item_name(root
, path
, goodnames
, 1))) {
492 ret
= btrfs_del_item(trans
, root
, path
);
495 if (found_type
== BTRFS_DIR_ITEM_KEY
&& found_key
.offset
== 1)
497 btrfs_release_path(root
, path
);
500 btrfs_release_path(root
, path
);
502 /* now the directory is empty */
503 err
= btrfs_unlink_trans(trans
, root
, dir
, dentry
);
508 btrfs_release_path(root
, path
);
509 btrfs_free_path(path
);
510 nr
= trans
->blocks_used
;
511 ret
= btrfs_end_transaction(trans
, root
);
512 mutex_unlock(&root
->fs_info
->fs_mutex
);
513 btrfs_btree_balance_dirty(root
, nr
);
519 static int btrfs_free_inode(struct btrfs_trans_handle
*trans
,
520 struct btrfs_root
*root
,
523 struct btrfs_path
*path
;
528 path
= btrfs_alloc_path();
530 ret
= btrfs_lookup_inode(trans
, root
, path
,
531 &BTRFS_I(inode
)->location
, -1);
535 ret
= btrfs_del_item(trans
, root
, path
);
536 btrfs_free_path(path
);
541 * this can truncate away extent items, csum items and directory items.
542 * It starts at a high offset and removes keys until it can't find
543 * any higher than i_size.
545 * csum items that cross the new i_size are truncated to the new size
548 static int btrfs_truncate_in_trans(struct btrfs_trans_handle
*trans
,
549 struct btrfs_root
*root
,
553 struct btrfs_path
*path
;
554 struct btrfs_key key
;
555 struct btrfs_key found_key
;
557 struct extent_buffer
*leaf
;
558 struct btrfs_file_extent_item
*fi
;
559 u64 extent_start
= 0;
560 u64 extent_num_bytes
= 0;
564 int extent_type
= -1;
566 btrfs_drop_extent_cache(inode
, inode
->i_size
, (u64
)-1);
567 path
= btrfs_alloc_path();
571 /* FIXME, add redo link to tree so we don't leak on crash */
572 key
.objectid
= inode
->i_ino
;
573 key
.offset
= (u64
)-1;
577 btrfs_init_path(path
);
579 ret
= btrfs_search_slot(trans
, root
, &key
, path
, -1, 1);
584 BUG_ON(path
->slots
[0] == 0);
587 leaf
= path
->nodes
[0];
588 btrfs_item_key_to_cpu(leaf
, &found_key
, path
->slots
[0]);
589 found_type
= btrfs_key_type(&found_key
);
591 if (found_key
.objectid
!= inode
->i_ino
)
594 if (found_type
!= BTRFS_CSUM_ITEM_KEY
&&
595 found_type
!= BTRFS_DIR_ITEM_KEY
&&
596 found_type
!= BTRFS_DIR_INDEX_KEY
&&
597 found_type
!= BTRFS_EXTENT_DATA_KEY
)
600 item_end
= found_key
.offset
;
601 if (found_type
== BTRFS_EXTENT_DATA_KEY
) {
602 fi
= btrfs_item_ptr(leaf
, path
->slots
[0],
603 struct btrfs_file_extent_item
);
604 extent_type
= btrfs_file_extent_type(leaf
, fi
);
605 if (extent_type
!= BTRFS_FILE_EXTENT_INLINE
) {
607 btrfs_file_extent_num_bytes(leaf
, fi
);
608 } else if (extent_type
== BTRFS_FILE_EXTENT_INLINE
) {
609 struct btrfs_item
*item
= btrfs_item_nr(leaf
,
611 item_end
+= btrfs_file_extent_inline_len(leaf
,
616 if (found_type
== BTRFS_CSUM_ITEM_KEY
) {
617 ret
= btrfs_csum_truncate(trans
, root
, path
,
621 if (item_end
< inode
->i_size
) {
622 if (found_type
== BTRFS_DIR_ITEM_KEY
) {
623 found_type
= BTRFS_INODE_ITEM_KEY
;
624 } else if (found_type
== BTRFS_EXTENT_ITEM_KEY
) {
625 found_type
= BTRFS_CSUM_ITEM_KEY
;
626 } else if (found_type
) {
631 btrfs_set_key_type(&key
, found_type
);
632 btrfs_release_path(root
, path
);
635 if (found_key
.offset
>= inode
->i_size
)
641 /* FIXME, shrink the extent if the ref count is only 1 */
642 if (found_type
!= BTRFS_EXTENT_DATA_KEY
)
645 if (extent_type
!= BTRFS_FILE_EXTENT_INLINE
) {
647 extent_start
= btrfs_file_extent_disk_bytenr(leaf
, fi
);
650 btrfs_file_extent_num_bytes(leaf
, fi
);
651 extent_num_bytes
= inode
->i_size
-
652 found_key
.offset
+ root
->sectorsize
- 1;
653 btrfs_set_file_extent_num_bytes(leaf
, fi
,
655 num_dec
= (orig_num_bytes
-
656 extent_num_bytes
) >> 9;
657 if (extent_start
!= 0) {
658 inode
->i_blocks
-= num_dec
;
660 btrfs_mark_buffer_dirty(leaf
);
663 btrfs_file_extent_disk_num_bytes(leaf
,
665 /* FIXME blocksize != 4096 */
666 num_dec
= btrfs_file_extent_num_bytes(leaf
,
668 if (extent_start
!= 0) {
670 inode
->i_blocks
-= num_dec
;
673 } else if (extent_type
== BTRFS_FILE_EXTENT_INLINE
&&
675 u32 newsize
= inode
->i_size
- found_key
.offset
;
676 newsize
= btrfs_file_extent_calc_inline_size(newsize
);
677 ret
= btrfs_truncate_item(trans
, root
, path
,
683 ret
= btrfs_del_item(trans
, root
, path
);
689 btrfs_release_path(root
, path
);
691 ret
= btrfs_free_extent(trans
, root
, extent_start
,
692 extent_num_bytes
, 0);
698 btrfs_release_path(root
, path
);
699 btrfs_free_path(path
);
700 inode
->i_sb
->s_dirt
= 1;
704 static int btrfs_cow_one_page(struct inode
*inode
, struct page
*page
,
709 struct extent_map_tree
*em_tree
= &BTRFS_I(inode
)->extent_tree
;
710 u64 page_start
= (u64
)page
->index
<< PAGE_CACHE_SHIFT
;
711 u64 page_end
= page_start
+ PAGE_CACHE_SIZE
- 1;
713 set_page_extent_mapped(page
);
715 lock_extent(em_tree
, page_start
, page_end
, GFP_NOFS
);
716 set_extent_delalloc(&BTRFS_I(inode
)->extent_tree
, page_start
,
718 if (zero_start
!= PAGE_CACHE_SIZE
) {
720 memset(kaddr
+ zero_start
, 0, PAGE_CACHE_SIZE
- zero_start
);
721 flush_dcache_page(page
);
724 set_page_dirty(page
);
725 unlock_extent(em_tree
, page_start
, page_end
, GFP_NOFS
);
731 * taken from block_truncate_page, but does cow as it zeros out
732 * any bytes left in the last page in the file.
734 static int btrfs_truncate_page(struct address_space
*mapping
, loff_t from
)
736 struct inode
*inode
= mapping
->host
;
737 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
738 u32 blocksize
= root
->sectorsize
;
739 pgoff_t index
= from
>> PAGE_CACHE_SHIFT
;
740 unsigned offset
= from
& (PAGE_CACHE_SIZE
-1);
745 if ((offset
& (blocksize
- 1)) == 0)
748 down_read(&root
->snap_sem
);
750 page
= grab_cache_page(mapping
, index
);
753 if (!PageUptodate(page
)) {
754 ret
= btrfs_readpage(NULL
, page
);
756 if (!PageUptodate(page
)) {
761 page_start
= (u64
)page
->index
<< PAGE_CACHE_SHIFT
;
763 ret
= btrfs_cow_one_page(inode
, page
, offset
);
766 page_cache_release(page
);
767 up_read(&BTRFS_I(inode
)->root
->snap_sem
);
772 static int btrfs_setattr(struct dentry
*dentry
, struct iattr
*attr
)
774 struct inode
*inode
= dentry
->d_inode
;
777 err
= inode_change_ok(inode
, attr
);
781 if (S_ISREG(inode
->i_mode
) &&
782 attr
->ia_valid
& ATTR_SIZE
&& attr
->ia_size
> inode
->i_size
) {
783 struct btrfs_trans_handle
*trans
;
784 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
785 struct extent_map_tree
*em_tree
= &BTRFS_I(inode
)->extent_tree
;
787 u64 mask
= root
->sectorsize
- 1;
788 u64 pos
= (inode
->i_size
+ mask
) & ~mask
;
789 u64 block_end
= attr
->ia_size
| mask
;
793 if (attr
->ia_size
<= pos
)
796 btrfs_truncate_page(inode
->i_mapping
, inode
->i_size
);
798 lock_extent(em_tree
, pos
, block_end
, GFP_NOFS
);
799 hole_size
= (attr
->ia_size
- pos
+ mask
) & ~mask
;
801 mutex_lock(&root
->fs_info
->fs_mutex
);
802 trans
= btrfs_start_transaction(root
, 1);
803 btrfs_set_trans_block_group(trans
, inode
);
804 err
= btrfs_drop_extents(trans
, root
, inode
,
805 pos
, pos
+ hole_size
, pos
,
808 if (alloc_hint
!= EXTENT_MAP_INLINE
) {
809 err
= btrfs_insert_file_extent(trans
, root
,
811 pos
, 0, 0, hole_size
);
813 btrfs_end_transaction(trans
, root
);
814 mutex_unlock(&root
->fs_info
->fs_mutex
);
815 unlock_extent(em_tree
, pos
, block_end
, GFP_NOFS
);
820 err
= inode_setattr(inode
, attr
);
824 void btrfs_delete_inode(struct inode
*inode
)
826 struct btrfs_trans_handle
*trans
;
827 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
831 truncate_inode_pages(&inode
->i_data
, 0);
832 if (is_bad_inode(inode
)) {
837 mutex_lock(&root
->fs_info
->fs_mutex
);
838 trans
= btrfs_start_transaction(root
, 1);
840 btrfs_set_trans_block_group(trans
, inode
);
841 ret
= btrfs_truncate_in_trans(trans
, root
, inode
);
844 ret
= btrfs_free_inode(trans
, root
, inode
);
847 nr
= trans
->blocks_used
;
849 btrfs_end_transaction(trans
, root
);
850 mutex_unlock(&root
->fs_info
->fs_mutex
);
851 btrfs_btree_balance_dirty(root
, nr
);
855 nr
= trans
->blocks_used
;
856 btrfs_end_transaction(trans
, root
);
857 mutex_unlock(&root
->fs_info
->fs_mutex
);
858 btrfs_btree_balance_dirty(root
, nr
);
864 * this returns the key found in the dir entry in the location pointer.
865 * If no dir entries were found, location->objectid is 0.
867 static int btrfs_inode_by_name(struct inode
*dir
, struct dentry
*dentry
,
868 struct btrfs_key
*location
)
870 const char *name
= dentry
->d_name
.name
;
871 int namelen
= dentry
->d_name
.len
;
872 struct btrfs_dir_item
*di
;
873 struct btrfs_path
*path
;
874 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
877 path
= btrfs_alloc_path();
879 di
= btrfs_lookup_dir_item(NULL
, root
, path
, dir
->i_ino
, name
,
883 if (!di
|| IS_ERR(di
)) {
884 location
->objectid
= 0;
887 btrfs_dir_item_key_to_cpu(path
->nodes
[0], di
, location
);
889 btrfs_release_path(root
, path
);
890 btrfs_free_path(path
);
895 * when we hit a tree root in a directory, the btrfs part of the inode
896 * needs to be changed to reflect the root directory of the tree root. This
897 * is kind of like crossing a mount point.
899 static int fixup_tree_root_location(struct btrfs_root
*root
,
900 struct btrfs_key
*location
,
901 struct btrfs_root
**sub_root
,
902 struct dentry
*dentry
)
904 struct btrfs_path
*path
;
905 struct btrfs_root_item
*ri
;
907 if (btrfs_key_type(location
) != BTRFS_ROOT_ITEM_KEY
)
909 if (location
->objectid
== BTRFS_ROOT_TREE_OBJECTID
)
912 path
= btrfs_alloc_path();
914 mutex_lock(&root
->fs_info
->fs_mutex
);
916 *sub_root
= btrfs_read_fs_root(root
->fs_info
, location
,
919 if (IS_ERR(*sub_root
))
920 return PTR_ERR(*sub_root
);
922 ri
= &(*sub_root
)->root_item
;
923 location
->objectid
= btrfs_root_dirid(ri
);
924 btrfs_set_key_type(location
, BTRFS_INODE_ITEM_KEY
);
925 location
->offset
= 0;
927 btrfs_free_path(path
);
928 mutex_unlock(&root
->fs_info
->fs_mutex
);
932 static int btrfs_init_locked_inode(struct inode
*inode
, void *p
)
934 struct btrfs_iget_args
*args
= p
;
935 inode
->i_ino
= args
->ino
;
936 BTRFS_I(inode
)->root
= args
->root
;
937 extent_map_tree_init(&BTRFS_I(inode
)->extent_tree
,
938 inode
->i_mapping
, GFP_NOFS
);
942 static int btrfs_find_actor(struct inode
*inode
, void *opaque
)
944 struct btrfs_iget_args
*args
= opaque
;
945 return (args
->ino
== inode
->i_ino
&&
946 args
->root
== BTRFS_I(inode
)->root
);
949 struct inode
*btrfs_iget_locked(struct super_block
*s
, u64 objectid
,
950 struct btrfs_root
*root
)
953 struct btrfs_iget_args args
;
957 inode
= iget5_locked(s
, objectid
, btrfs_find_actor
,
958 btrfs_init_locked_inode
,
963 static struct dentry
*btrfs_lookup(struct inode
*dir
, struct dentry
*dentry
,
964 struct nameidata
*nd
)
966 struct inode
* inode
;
967 struct btrfs_inode
*bi
= BTRFS_I(dir
);
968 struct btrfs_root
*root
= bi
->root
;
969 struct btrfs_root
*sub_root
= root
;
970 struct btrfs_key location
;
973 if (dentry
->d_name
.len
> BTRFS_NAME_LEN
)
974 return ERR_PTR(-ENAMETOOLONG
);
976 mutex_lock(&root
->fs_info
->fs_mutex
);
977 ret
= btrfs_inode_by_name(dir
, dentry
, &location
);
978 mutex_unlock(&root
->fs_info
->fs_mutex
);
984 if (location
.objectid
) {
985 ret
= fixup_tree_root_location(root
, &location
, &sub_root
,
990 return ERR_PTR(-ENOENT
);
991 inode
= btrfs_iget_locked(dir
->i_sb
, location
.objectid
,
994 return ERR_PTR(-EACCES
);
995 if (inode
->i_state
& I_NEW
) {
996 /* the inode and parent dir are two different roots */
997 if (sub_root
!= root
) {
999 sub_root
->inode
= inode
;
1001 BTRFS_I(inode
)->root
= sub_root
;
1002 memcpy(&BTRFS_I(inode
)->location
, &location
,
1004 btrfs_read_locked_inode(inode
);
1005 unlock_new_inode(inode
);
1008 return d_splice_alias(inode
, dentry
);
1011 static unsigned char btrfs_filetype_table
[] = {
1012 DT_UNKNOWN
, DT_REG
, DT_DIR
, DT_CHR
, DT_BLK
, DT_FIFO
, DT_SOCK
, DT_LNK
1015 static int btrfs_readdir(struct file
*filp
, void *dirent
, filldir_t filldir
)
1017 struct inode
*inode
= filp
->f_path
.dentry
->d_inode
;
1018 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1019 struct btrfs_item
*item
;
1020 struct btrfs_dir_item
*di
;
1021 struct btrfs_key key
;
1022 struct btrfs_key found_key
;
1023 struct btrfs_path
*path
;
1026 struct extent_buffer
*leaf
;
1029 unsigned char d_type
;
1034 int key_type
= BTRFS_DIR_INDEX_KEY
;
1039 /* FIXME, use a real flag for deciding about the key type */
1040 if (root
->fs_info
->tree_root
== root
)
1041 key_type
= BTRFS_DIR_ITEM_KEY
;
1043 mutex_lock(&root
->fs_info
->fs_mutex
);
1044 key
.objectid
= inode
->i_ino
;
1045 btrfs_set_key_type(&key
, key_type
);
1046 key
.offset
= filp
->f_pos
;
1048 path
= btrfs_alloc_path();
1050 ret
= btrfs_search_slot(NULL
, root
, &key
, path
, 0, 0);
1055 leaf
= path
->nodes
[0];
1056 nritems
= btrfs_header_nritems(leaf
);
1057 slot
= path
->slots
[0];
1058 if (advance
|| slot
>= nritems
) {
1059 if (slot
>= nritems
-1) {
1060 ret
= btrfs_next_leaf(root
, path
);
1063 leaf
= path
->nodes
[0];
1064 nritems
= btrfs_header_nritems(leaf
);
1065 slot
= path
->slots
[0];
1072 item
= btrfs_item_nr(leaf
, slot
);
1073 btrfs_item_key_to_cpu(leaf
, &found_key
, slot
);
1075 if (found_key
.objectid
!= key
.objectid
)
1077 if (btrfs_key_type(&found_key
) != key_type
)
1079 if (found_key
.offset
< filp
->f_pos
)
1082 filp
->f_pos
= found_key
.offset
;
1084 di
= btrfs_item_ptr(leaf
, slot
, struct btrfs_dir_item
);
1086 di_total
= btrfs_item_size(leaf
, item
);
1087 while(di_cur
< di_total
) {
1088 struct btrfs_key location
;
1090 name_len
= btrfs_dir_name_len(leaf
, di
);
1091 if (name_len
< 32) {
1092 name_ptr
= tmp_name
;
1094 name_ptr
= kmalloc(name_len
, GFP_NOFS
);
1097 read_extent_buffer(leaf
, name_ptr
,
1098 (unsigned long)(di
+ 1), name_len
);
1100 d_type
= btrfs_filetype_table
[btrfs_dir_type(leaf
, di
)];
1101 btrfs_dir_item_key_to_cpu(leaf
, di
, &location
);
1103 over
= filldir(dirent
, name_ptr
, name_len
,
1108 if (name_ptr
!= tmp_name
)
1113 di_len
= btrfs_dir_name_len(leaf
, di
) + sizeof(*di
);
1115 di
= (struct btrfs_dir_item
*)((char *)di
+ di_len
);
1122 btrfs_release_path(root
, path
);
1123 btrfs_free_path(path
);
1124 mutex_unlock(&root
->fs_info
->fs_mutex
);
1128 int btrfs_write_inode(struct inode
*inode
, int wait
)
1130 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1131 struct btrfs_trans_handle
*trans
;
1135 mutex_lock(&root
->fs_info
->fs_mutex
);
1136 trans
= btrfs_start_transaction(root
, 1);
1137 btrfs_set_trans_block_group(trans
, inode
);
1138 ret
= btrfs_commit_transaction(trans
, root
);
1139 mutex_unlock(&root
->fs_info
->fs_mutex
);
1145 * This is somewhat expensive, updating the tree every time the
1146 * inode changes. But, it is most likely to find the inode in cache.
1147 * FIXME, needs more benchmarking...there are no reasons other than performance
1148 * to keep or drop this code.
1150 void btrfs_dirty_inode(struct inode
*inode
)
1152 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1153 struct btrfs_trans_handle
*trans
;
1155 mutex_lock(&root
->fs_info
->fs_mutex
);
1156 trans
= btrfs_start_transaction(root
, 1);
1157 btrfs_set_trans_block_group(trans
, inode
);
1158 btrfs_update_inode(trans
, root
, inode
);
1159 btrfs_end_transaction(trans
, root
);
1160 mutex_unlock(&root
->fs_info
->fs_mutex
);
1163 static struct inode
*btrfs_new_inode(struct btrfs_trans_handle
*trans
,
1164 struct btrfs_root
*root
,
1166 struct btrfs_block_group_cache
*group
,
1169 struct inode
*inode
;
1170 struct btrfs_inode_item
*inode_item
;
1171 struct btrfs_key
*location
;
1172 struct btrfs_path
*path
;
1176 path
= btrfs_alloc_path();
1179 inode
= new_inode(root
->fs_info
->sb
);
1181 return ERR_PTR(-ENOMEM
);
1183 extent_map_tree_init(&BTRFS_I(inode
)->extent_tree
,
1184 inode
->i_mapping
, GFP_NOFS
);
1185 BTRFS_I(inode
)->root
= root
;
1191 group
= btrfs_find_block_group(root
, group
, 0, 0, owner
);
1192 BTRFS_I(inode
)->block_group
= group
;
1194 ret
= btrfs_insert_empty_inode(trans
, root
, path
, objectid
);
1198 inode
->i_uid
= current
->fsuid
;
1199 inode
->i_gid
= current
->fsgid
;
1200 inode
->i_mode
= mode
;
1201 inode
->i_ino
= objectid
;
1202 inode
->i_blocks
= 0;
1203 inode
->i_mtime
= inode
->i_atime
= inode
->i_ctime
= CURRENT_TIME
;
1204 inode_item
= btrfs_item_ptr(path
->nodes
[0], path
->slots
[0],
1205 struct btrfs_inode_item
);
1206 fill_inode_item(path
->nodes
[0], inode_item
, inode
);
1207 btrfs_mark_buffer_dirty(path
->nodes
[0]);
1208 btrfs_free_path(path
);
1210 location
= &BTRFS_I(inode
)->location
;
1211 location
->objectid
= objectid
;
1212 location
->offset
= 0;
1213 btrfs_set_key_type(location
, BTRFS_INODE_ITEM_KEY
);
1215 insert_inode_hash(inode
);
1218 btrfs_free_path(path
);
1219 return ERR_PTR(ret
);
1222 static inline u8
btrfs_inode_type(struct inode
*inode
)
1224 return btrfs_type_by_mode
[(inode
->i_mode
& S_IFMT
) >> S_SHIFT
];
1227 static int btrfs_add_link(struct btrfs_trans_handle
*trans
,
1228 struct dentry
*dentry
, struct inode
*inode
)
1231 struct btrfs_key key
;
1232 struct btrfs_root
*root
= BTRFS_I(dentry
->d_parent
->d_inode
)->root
;
1233 struct inode
*parent_inode
;
1235 key
.objectid
= inode
->i_ino
;
1236 btrfs_set_key_type(&key
, BTRFS_INODE_ITEM_KEY
);
1239 ret
= btrfs_insert_dir_item(trans
, root
,
1240 dentry
->d_name
.name
, dentry
->d_name
.len
,
1241 dentry
->d_parent
->d_inode
->i_ino
,
1242 &key
, btrfs_inode_type(inode
));
1244 parent_inode
= dentry
->d_parent
->d_inode
;
1245 parent_inode
->i_size
+= dentry
->d_name
.len
* 2;
1246 parent_inode
->i_mtime
= parent_inode
->i_ctime
= CURRENT_TIME
;
1247 ret
= btrfs_update_inode(trans
, root
,
1248 dentry
->d_parent
->d_inode
);
1253 static int btrfs_add_nondir(struct btrfs_trans_handle
*trans
,
1254 struct dentry
*dentry
, struct inode
*inode
)
1256 int err
= btrfs_add_link(trans
, dentry
, inode
);
1258 d_instantiate(dentry
, inode
);
1266 static int btrfs_mknod(struct inode
*dir
, struct dentry
*dentry
,
1267 int mode
, dev_t rdev
)
1269 struct btrfs_trans_handle
*trans
;
1270 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
1271 struct inode
*inode
;
1277 if (!new_valid_dev(rdev
))
1280 mutex_lock(&root
->fs_info
->fs_mutex
);
1281 trans
= btrfs_start_transaction(root
, 1);
1282 btrfs_set_trans_block_group(trans
, dir
);
1284 err
= btrfs_find_free_objectid(trans
, root
, dir
->i_ino
, &objectid
);
1290 inode
= btrfs_new_inode(trans
, root
, objectid
,
1291 BTRFS_I(dir
)->block_group
, mode
);
1292 err
= PTR_ERR(inode
);
1296 btrfs_set_trans_block_group(trans
, inode
);
1297 err
= btrfs_add_nondir(trans
, dentry
, inode
);
1301 inode
->i_op
= &btrfs_special_inode_operations
;
1302 init_special_inode(inode
, inode
->i_mode
, rdev
);
1303 btrfs_update_inode(trans
, root
, inode
);
1305 dir
->i_sb
->s_dirt
= 1;
1306 btrfs_update_inode_block_group(trans
, inode
);
1307 btrfs_update_inode_block_group(trans
, dir
);
1309 nr
= trans
->blocks_used
;
1310 btrfs_end_transaction(trans
, root
);
1311 mutex_unlock(&root
->fs_info
->fs_mutex
);
1314 inode_dec_link_count(inode
);
1317 btrfs_btree_balance_dirty(root
, nr
);
1321 static int btrfs_create(struct inode
*dir
, struct dentry
*dentry
,
1322 int mode
, struct nameidata
*nd
)
1324 struct btrfs_trans_handle
*trans
;
1325 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
1326 struct inode
*inode
;
1332 mutex_lock(&root
->fs_info
->fs_mutex
);
1333 trans
= btrfs_start_transaction(root
, 1);
1334 btrfs_set_trans_block_group(trans
, dir
);
1336 err
= btrfs_find_free_objectid(trans
, root
, dir
->i_ino
, &objectid
);
1342 inode
= btrfs_new_inode(trans
, root
, objectid
,
1343 BTRFS_I(dir
)->block_group
, mode
);
1344 err
= PTR_ERR(inode
);
1348 btrfs_set_trans_block_group(trans
, inode
);
1349 err
= btrfs_add_nondir(trans
, dentry
, inode
);
1353 inode
->i_mapping
->a_ops
= &btrfs_aops
;
1354 inode
->i_fop
= &btrfs_file_operations
;
1355 inode
->i_op
= &btrfs_file_inode_operations
;
1356 extent_map_tree_init(&BTRFS_I(inode
)->extent_tree
,
1357 inode
->i_mapping
, GFP_NOFS
);
1358 BTRFS_I(inode
)->extent_tree
.ops
= &btrfs_extent_map_ops
;
1360 dir
->i_sb
->s_dirt
= 1;
1361 btrfs_update_inode_block_group(trans
, inode
);
1362 btrfs_update_inode_block_group(trans
, dir
);
1364 nr
= trans
->blocks_used
;
1365 btrfs_end_transaction(trans
, root
);
1366 mutex_unlock(&root
->fs_info
->fs_mutex
);
1369 inode_dec_link_count(inode
);
1372 btrfs_btree_balance_dirty(root
, nr
);
1376 static int btrfs_link(struct dentry
*old_dentry
, struct inode
*dir
,
1377 struct dentry
*dentry
)
1379 struct btrfs_trans_handle
*trans
;
1380 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
1381 struct inode
*inode
= old_dentry
->d_inode
;
1386 if (inode
->i_nlink
== 0)
1390 mutex_lock(&root
->fs_info
->fs_mutex
);
1391 trans
= btrfs_start_transaction(root
, 1);
1393 btrfs_set_trans_block_group(trans
, dir
);
1394 atomic_inc(&inode
->i_count
);
1395 err
= btrfs_add_nondir(trans
, dentry
, inode
);
1400 dir
->i_sb
->s_dirt
= 1;
1401 btrfs_update_inode_block_group(trans
, dir
);
1402 err
= btrfs_update_inode(trans
, root
, inode
);
1407 nr
= trans
->blocks_used
;
1408 btrfs_end_transaction(trans
, root
);
1409 mutex_unlock(&root
->fs_info
->fs_mutex
);
1412 inode_dec_link_count(inode
);
1415 btrfs_btree_balance_dirty(root
, nr
);
1419 static int btrfs_make_empty_dir(struct btrfs_trans_handle
*trans
,
1420 struct btrfs_root
*root
,
1421 u64 objectid
, u64 dirid
)
1425 struct btrfs_key key
;
1430 key
.objectid
= objectid
;
1432 btrfs_set_key_type(&key
, BTRFS_INODE_ITEM_KEY
);
1434 ret
= btrfs_insert_dir_item(trans
, root
, buf
, 1, objectid
,
1435 &key
, BTRFS_FT_DIR
);
1439 key
.objectid
= dirid
;
1440 ret
= btrfs_insert_dir_item(trans
, root
, buf
, 2, objectid
,
1441 &key
, BTRFS_FT_DIR
);
1448 static int btrfs_mkdir(struct inode
*dir
, struct dentry
*dentry
, int mode
)
1450 struct inode
*inode
;
1451 struct btrfs_trans_handle
*trans
;
1452 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
1454 int drop_on_err
= 0;
1456 unsigned long nr
= 1;
1458 mutex_lock(&root
->fs_info
->fs_mutex
);
1459 trans
= btrfs_start_transaction(root
, 1);
1460 btrfs_set_trans_block_group(trans
, dir
);
1462 if (IS_ERR(trans
)) {
1463 err
= PTR_ERR(trans
);
1467 err
= btrfs_find_free_objectid(trans
, root
, dir
->i_ino
, &objectid
);
1473 inode
= btrfs_new_inode(trans
, root
, objectid
,
1474 BTRFS_I(dir
)->block_group
, S_IFDIR
| mode
);
1475 if (IS_ERR(inode
)) {
1476 err
= PTR_ERR(inode
);
1481 inode
->i_op
= &btrfs_dir_inode_operations
;
1482 inode
->i_fop
= &btrfs_dir_file_operations
;
1483 btrfs_set_trans_block_group(trans
, inode
);
1485 err
= btrfs_make_empty_dir(trans
, root
, inode
->i_ino
, dir
->i_ino
);
1490 err
= btrfs_update_inode(trans
, root
, inode
);
1494 err
= btrfs_add_link(trans
, dentry
, inode
);
1498 d_instantiate(dentry
, inode
);
1500 dir
->i_sb
->s_dirt
= 1;
1501 btrfs_update_inode_block_group(trans
, inode
);
1502 btrfs_update_inode_block_group(trans
, dir
);
1505 nr
= trans
->blocks_used
;
1506 btrfs_end_transaction(trans
, root
);
1509 mutex_unlock(&root
->fs_info
->fs_mutex
);
1512 btrfs_btree_balance_dirty(root
, nr
);
1516 struct extent_map
*btrfs_get_extent(struct inode
*inode
, struct page
*page
,
1517 size_t page_offset
, u64 start
, u64 end
,
1523 u64 extent_start
= 0;
1525 u64 objectid
= inode
->i_ino
;
1527 int failed_insert
= 0;
1528 struct btrfs_path
*path
;
1529 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1530 struct btrfs_file_extent_item
*item
;
1531 struct extent_buffer
*leaf
;
1532 struct btrfs_key found_key
;
1533 struct extent_map
*em
= NULL
;
1534 struct extent_map_tree
*em_tree
= &BTRFS_I(inode
)->extent_tree
;
1535 struct btrfs_trans_handle
*trans
= NULL
;
1537 path
= btrfs_alloc_path();
1539 mutex_lock(&root
->fs_info
->fs_mutex
);
1542 em
= lookup_extent_mapping(em_tree
, start
, end
);
1547 em
= alloc_extent_map(GFP_NOFS
);
1552 em
->start
= EXTENT_MAP_HOLE
;
1553 em
->end
= EXTENT_MAP_HOLE
;
1555 em
->bdev
= inode
->i_sb
->s_bdev
;
1556 ret
= btrfs_lookup_file_extent(trans
, root
, path
,
1557 objectid
, start
, trans
!= NULL
);
1564 if (path
->slots
[0] == 0)
1569 leaf
= path
->nodes
[0];
1570 item
= btrfs_item_ptr(leaf
, path
->slots
[0],
1571 struct btrfs_file_extent_item
);
1572 /* are we inside the extent that was found? */
1573 btrfs_item_key_to_cpu(leaf
, &found_key
, path
->slots
[0]);
1574 found_type
= btrfs_key_type(&found_key
);
1575 if (found_key
.objectid
!= objectid
||
1576 found_type
!= BTRFS_EXTENT_DATA_KEY
) {
1580 found_type
= btrfs_file_extent_type(leaf
, item
);
1581 extent_start
= found_key
.offset
;
1582 if (found_type
== BTRFS_FILE_EXTENT_REG
) {
1583 extent_end
= extent_start
+
1584 btrfs_file_extent_num_bytes(leaf
, item
);
1586 if (start
< extent_start
|| start
>= extent_end
) {
1588 if (start
< extent_start
) {
1589 if (end
< extent_start
)
1591 em
->end
= extent_end
- 1;
1597 bytenr
= btrfs_file_extent_disk_bytenr(leaf
, item
);
1599 em
->start
= extent_start
;
1600 em
->end
= extent_end
- 1;
1601 em
->block_start
= EXTENT_MAP_HOLE
;
1602 em
->block_end
= EXTENT_MAP_HOLE
;
1605 bytenr
+= btrfs_file_extent_offset(leaf
, item
);
1606 em
->block_start
= bytenr
;
1607 em
->block_end
= em
->block_start
+
1608 btrfs_file_extent_num_bytes(leaf
, item
) - 1;
1609 em
->start
= extent_start
;
1610 em
->end
= extent_end
- 1;
1612 } else if (found_type
== BTRFS_FILE_EXTENT_INLINE
) {
1616 size_t extent_offset
;
1619 size
= btrfs_file_extent_inline_len(leaf
, btrfs_item_nr(leaf
,
1621 extent_end
= (extent_start
+ size
- 1) |
1622 ((u64
)root
->sectorsize
- 1);
1623 if (start
< extent_start
|| start
>= extent_end
) {
1625 if (start
< extent_start
) {
1626 if (end
< extent_start
)
1628 em
->end
= extent_end
;
1634 em
->block_start
= EXTENT_MAP_INLINE
;
1635 em
->block_end
= EXTENT_MAP_INLINE
;
1638 em
->start
= extent_start
;
1639 em
->end
= extent_start
+ size
- 1;
1643 extent_offset
= ((u64
)page
->index
<< PAGE_CACHE_SHIFT
) -
1644 extent_start
+ page_offset
;
1645 copy_size
= min_t(u64
, PAGE_CACHE_SIZE
- page_offset
,
1646 size
- extent_offset
);
1647 em
->start
= extent_start
+ extent_offset
;
1648 em
->end
= (em
->start
+ copy_size
-1) |
1649 ((u64
)root
->sectorsize
-1);
1651 ptr
= btrfs_file_extent_inline_start(item
) + extent_offset
;
1652 if (create
== 0 && !PageUptodate(page
)) {
1653 read_extent_buffer(leaf
, map
+ page_offset
, ptr
,
1655 flush_dcache_page(page
);
1656 } else if (create
&& PageUptodate(page
)) {
1659 free_extent_map(em
);
1661 btrfs_release_path(root
, path
);
1662 trans
= btrfs_start_transaction(root
, 1);
1665 write_extent_buffer(leaf
, map
+ page_offset
, ptr
,
1667 btrfs_mark_buffer_dirty(leaf
);
1670 set_extent_uptodate(em_tree
, em
->start
, em
->end
, GFP_NOFS
);
1673 printk("unkknown found_type %d\n", found_type
);
1680 em
->block_start
= EXTENT_MAP_HOLE
;
1681 em
->block_end
= EXTENT_MAP_HOLE
;
1683 btrfs_release_path(root
, path
);
1684 if (em
->start
> start
|| em
->end
< start
) {
1685 printk("bad extent! em: [%Lu %Lu] passed [%Lu %Lu]\n", em
->start
, em
->end
, start
, end
);
1689 ret
= add_extent_mapping(em_tree
, em
);
1690 if (ret
== -EEXIST
) {
1691 free_extent_map(em
);
1694 if (failed_insert
> 5) {
1695 printk("failing to insert %Lu %Lu\n", start
, end
);
1703 btrfs_free_path(path
);
1705 ret
= btrfs_end_transaction(trans
, root
);
1709 mutex_unlock(&root
->fs_info
->fs_mutex
);
1711 free_extent_map(em
);
1713 return ERR_PTR(err
);
1718 static sector_t
btrfs_bmap(struct address_space
*mapping
, sector_t iblock
)
1720 return extent_bmap(mapping
, iblock
, btrfs_get_extent
);
1723 static int btrfs_prepare_write(struct file
*file
, struct page
*page
,
1724 unsigned from
, unsigned to
)
1726 return extent_prepare_write(&BTRFS_I(page
->mapping
->host
)->extent_tree
,
1727 page
->mapping
->host
, page
, from
, to
,
1731 int btrfs_readpage(struct file
*file
, struct page
*page
)
1733 struct extent_map_tree
*tree
;
1734 tree
= &BTRFS_I(page
->mapping
->host
)->extent_tree
;
1735 return extent_read_full_page(tree
, page
, btrfs_get_extent
);
1737 static int btrfs_writepage(struct page
*page
, struct writeback_control
*wbc
)
1739 struct extent_map_tree
*tree
;
1742 if (current
->flags
& PF_MEMALLOC
) {
1743 redirty_page_for_writepage(wbc
, page
);
1747 tree
= &BTRFS_I(page
->mapping
->host
)->extent_tree
;
1748 return extent_write_full_page(tree
, page
, btrfs_get_extent
, wbc
);
1752 static int btrfs_writepages(struct address_space
*mapping
,
1753 struct writeback_control
*wbc
)
1755 struct extent_map_tree
*tree
;
1756 tree
= &BTRFS_I(mapping
->host
)->extent_tree
;
1757 return extent_writepages(tree
, mapping
, btrfs_get_extent
, wbc
);
1760 static int btrfs_releasepage(struct page
*page
, gfp_t unused_gfp_flags
)
1762 struct extent_map_tree
*tree
;
1765 tree
= &BTRFS_I(page
->mapping
->host
)->extent_tree
;
1766 ret
= try_release_extent_mapping(tree
, page
);
1768 ClearPagePrivate(page
);
1769 set_page_private(page
, 0);
1770 page_cache_release(page
);
1775 static void btrfs_invalidatepage(struct page
*page
, unsigned long offset
)
1777 struct extent_map_tree
*tree
;
1779 tree
= &BTRFS_I(page
->mapping
->host
)->extent_tree
;
1780 extent_invalidatepage(tree
, page
, offset
);
1781 btrfs_releasepage(page
, GFP_NOFS
);
1785 * btrfs_page_mkwrite() is not allowed to change the file size as it gets
1786 * called from a page fault handler when a page is first dirtied. Hence we must
1787 * be careful to check for EOF conditions here. We set the page up correctly
1788 * for a written page which means we get ENOSPC checking when writing into
1789 * holes and correct delalloc and unwritten extent mapping on filesystems that
1790 * support these features.
1792 * We are not allowed to take the i_mutex here so we have to play games to
1793 * protect against truncate races as the page could now be beyond EOF. Because
1794 * vmtruncate() writes the inode size before removing pages, once we have the
1795 * page lock we can determine safely if the page is beyond EOF. If it is not
1796 * beyond EOF, then the page is guaranteed safe against truncation until we
1799 int btrfs_page_mkwrite(struct vm_area_struct
*vma
, struct page
*page
)
1801 struct inode
*inode
= vma
->vm_file
->f_path
.dentry
->d_inode
;
1807 down_read(&BTRFS_I(inode
)->root
->snap_sem
);
1809 wait_on_page_writeback(page
);
1810 size
= i_size_read(inode
);
1811 page_start
= (u64
)page
->index
<< PAGE_CACHE_SHIFT
;
1813 if ((page
->mapping
!= inode
->i_mapping
) ||
1814 (page_start
> size
)) {
1815 /* page got truncated out from underneath us */
1819 /* page is wholly or partially inside EOF */
1820 if (page_start
+ PAGE_CACHE_SIZE
> size
)
1821 end
= size
& ~PAGE_CACHE_MASK
;
1823 end
= PAGE_CACHE_SIZE
;
1825 ret
= btrfs_cow_one_page(inode
, page
, end
);
1828 up_read(&BTRFS_I(inode
)->root
->snap_sem
);
1833 static void btrfs_truncate(struct inode
*inode
)
1835 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1837 struct btrfs_trans_handle
*trans
;
1840 if (!S_ISREG(inode
->i_mode
))
1842 if (IS_APPEND(inode
) || IS_IMMUTABLE(inode
))
1845 btrfs_truncate_page(inode
->i_mapping
, inode
->i_size
);
1847 mutex_lock(&root
->fs_info
->fs_mutex
);
1848 trans
= btrfs_start_transaction(root
, 1);
1849 btrfs_set_trans_block_group(trans
, inode
);
1851 /* FIXME, add redo link to tree so we don't leak on crash */
1852 ret
= btrfs_truncate_in_trans(trans
, root
, inode
);
1853 btrfs_update_inode(trans
, root
, inode
);
1854 nr
= trans
->blocks_used
;
1856 ret
= btrfs_end_transaction(trans
, root
);
1858 mutex_unlock(&root
->fs_info
->fs_mutex
);
1859 btrfs_btree_balance_dirty(root
, nr
);
1862 int btrfs_commit_write(struct file
*file
, struct page
*page
,
1863 unsigned from
, unsigned to
)
1865 return extent_commit_write(&BTRFS_I(page
->mapping
->host
)->extent_tree
,
1866 page
->mapping
->host
, page
, from
, to
);
1869 static int create_subvol(struct btrfs_root
*root
, char *name
, int namelen
)
1871 struct btrfs_trans_handle
*trans
;
1872 struct btrfs_key key
;
1873 struct btrfs_root_item root_item
;
1874 struct btrfs_inode_item
*inode_item
;
1875 struct extent_buffer
*leaf
;
1876 struct btrfs_root
*new_root
;
1877 struct inode
*inode
;
1882 u64 new_dirid
= BTRFS_FIRST_FREE_OBJECTID
;
1883 unsigned long nr
= 1;
1885 mutex_lock(&root
->fs_info
->fs_mutex
);
1886 trans
= btrfs_start_transaction(root
, 1);
1889 leaf
= btrfs_alloc_free_block(trans
, root
, root
->leafsize
, 0, 0);
1891 return PTR_ERR(leaf
);
1893 btrfs_set_header_nritems(leaf
, 0);
1894 btrfs_set_header_level(leaf
, 0);
1895 btrfs_set_header_bytenr(leaf
, leaf
->start
);
1896 btrfs_set_header_generation(leaf
, trans
->transid
);
1897 btrfs_set_header_owner(leaf
, root
->root_key
.objectid
);
1898 write_extent_buffer(leaf
, root
->fs_info
->fsid
,
1899 (unsigned long)btrfs_header_fsid(leaf
),
1901 btrfs_mark_buffer_dirty(leaf
);
1903 inode_item
= &root_item
.inode
;
1904 memset(inode_item
, 0, sizeof(*inode_item
));
1905 inode_item
->generation
= cpu_to_le64(1);
1906 inode_item
->size
= cpu_to_le64(3);
1907 inode_item
->nlink
= cpu_to_le32(1);
1908 inode_item
->nblocks
= cpu_to_le64(1);
1909 inode_item
->mode
= cpu_to_le32(S_IFDIR
| 0755);
1911 btrfs_set_root_bytenr(&root_item
, leaf
->start
);
1912 btrfs_set_root_level(&root_item
, 0);
1913 btrfs_set_root_refs(&root_item
, 1);
1914 btrfs_set_root_used(&root_item
, 0);
1916 memset(&root_item
.drop_progress
, 0, sizeof(root_item
.drop_progress
));
1917 root_item
.drop_level
= 0;
1919 free_extent_buffer(leaf
);
1922 ret
= btrfs_find_free_objectid(trans
, root
->fs_info
->tree_root
,
1927 btrfs_set_root_dirid(&root_item
, new_dirid
);
1929 key
.objectid
= objectid
;
1931 btrfs_set_key_type(&key
, BTRFS_ROOT_ITEM_KEY
);
1932 ret
= btrfs_insert_root(trans
, root
->fs_info
->tree_root
, &key
,
1938 * insert the directory item
1940 key
.offset
= (u64
)-1;
1941 dir
= root
->fs_info
->sb
->s_root
->d_inode
;
1942 ret
= btrfs_insert_dir_item(trans
, root
->fs_info
->tree_root
,
1943 name
, namelen
, dir
->i_ino
, &key
,
1948 ret
= btrfs_commit_transaction(trans
, root
);
1952 new_root
= btrfs_read_fs_root(root
->fs_info
, &key
, name
, namelen
);
1955 trans
= btrfs_start_transaction(new_root
, 1);
1958 inode
= btrfs_new_inode(trans
, new_root
, new_dirid
,
1959 BTRFS_I(dir
)->block_group
, S_IFDIR
| 0700);
1962 inode
->i_op
= &btrfs_dir_inode_operations
;
1963 inode
->i_fop
= &btrfs_dir_file_operations
;
1964 new_root
->inode
= inode
;
1966 ret
= btrfs_make_empty_dir(trans
, new_root
, new_dirid
, new_dirid
);
1972 ret
= btrfs_update_inode(trans
, new_root
, inode
);
1976 nr
= trans
->blocks_used
;
1977 err
= btrfs_commit_transaction(trans
, root
);
1981 mutex_unlock(&root
->fs_info
->fs_mutex
);
1982 btrfs_btree_balance_dirty(root
, nr
);
1986 static int create_snapshot(struct btrfs_root
*root
, char *name
, int namelen
)
1988 struct btrfs_trans_handle
*trans
;
1989 struct btrfs_key key
;
1990 struct btrfs_root_item new_root_item
;
1991 struct extent_buffer
*tmp
;
1997 if (!root
->ref_cows
)
2000 down_write(&root
->snap_sem
);
2001 freeze_bdev(root
->fs_info
->sb
->s_bdev
);
2002 thaw_bdev(root
->fs_info
->sb
->s_bdev
, root
->fs_info
->sb
);
2004 mutex_lock(&root
->fs_info
->fs_mutex
);
2005 trans
= btrfs_start_transaction(root
, 1);
2008 ret
= btrfs_update_inode(trans
, root
, root
->inode
);
2012 ret
= btrfs_find_free_objectid(trans
, root
->fs_info
->tree_root
,
2017 memcpy(&new_root_item
, &root
->root_item
,
2018 sizeof(new_root_item
));
2020 key
.objectid
= objectid
;
2022 btrfs_set_key_type(&key
, BTRFS_ROOT_ITEM_KEY
);
2024 btrfs_cow_block(trans
, root
, root
->node
, NULL
, 0, &tmp
);
2025 btrfs_set_root_bytenr(&new_root_item
, root
->node
->start
);
2026 btrfs_set_root_level(&new_root_item
, btrfs_header_level(root
->node
));
2028 ret
= btrfs_insert_root(trans
, root
->fs_info
->tree_root
, &key
,
2034 * insert the directory item
2036 key
.offset
= (u64
)-1;
2037 ret
= btrfs_insert_dir_item(trans
, root
->fs_info
->tree_root
,
2039 root
->fs_info
->sb
->s_root
->d_inode
->i_ino
,
2040 &key
, BTRFS_FT_DIR
);
2045 ret
= btrfs_inc_root_ref(trans
, root
);
2049 nr
= trans
->blocks_used
;
2050 err
= btrfs_commit_transaction(trans
, root
);
2055 mutex_unlock(&root
->fs_info
->fs_mutex
);
2056 up_write(&root
->snap_sem
);
2057 btrfs_btree_balance_dirty(root
, nr
);
2061 static unsigned long force_ra(struct address_space
*mapping
,
2062 struct file_ra_state
*ra
, struct file
*file
,
2063 pgoff_t offset
, pgoff_t last_index
)
2067 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23)
2068 req_size
= last_index
- offset
+ 1;
2069 offset
= page_cache_readahead(mapping
, ra
, file
, offset
, req_size
);
2072 req_size
= min(last_index
- offset
+ 1, (pgoff_t
)128);
2073 page_cache_sync_readahead(mapping
, ra
, file
, offset
, req_size
);
2074 return offset
+ req_size
;
2078 int btrfs_defrag_file(struct file
*file
) {
2079 struct inode
*inode
= file
->f_path
.dentry
->d_inode
;
2080 struct extent_map_tree
*em_tree
= &BTRFS_I(inode
)->extent_tree
;
2082 unsigned long last_index
;
2083 unsigned long ra_index
= 0;
2088 mutex_lock(&inode
->i_mutex
);
2089 last_index
= inode
->i_size
>> PAGE_CACHE_SHIFT
;
2090 for (i
= 0; i
<= last_index
; i
++) {
2091 if (i
== ra_index
) {
2092 ra_index
= force_ra(inode
->i_mapping
, &file
->f_ra
,
2093 file
, ra_index
, last_index
);
2095 page
= grab_cache_page(inode
->i_mapping
, i
);
2098 if (!PageUptodate(page
)) {
2099 btrfs_readpage(NULL
, page
);
2101 if (!PageUptodate(page
)) {
2103 page_cache_release(page
);
2107 page_start
= (u64
)page
->index
<< PAGE_CACHE_SHIFT
;
2108 page_end
= page_start
+ PAGE_CACHE_SIZE
- 1;
2110 lock_extent(em_tree
, page_start
, page_end
, GFP_NOFS
);
2111 set_extent_delalloc(em_tree
, page_start
,
2112 page_end
, GFP_NOFS
);
2113 unlock_extent(em_tree
, page_start
, page_end
, GFP_NOFS
);
2114 set_page_dirty(page
);
2116 page_cache_release(page
);
2117 balance_dirty_pages_ratelimited_nr(inode
->i_mapping
, 1);
2121 mutex_unlock(&inode
->i_mutex
);
2125 static int btrfs_ioctl_snap_create(struct btrfs_root
*root
, void __user
*arg
)
2127 struct btrfs_ioctl_vol_args vol_args
;
2128 struct btrfs_dir_item
*di
;
2129 struct btrfs_path
*path
;
2133 if (copy_from_user(&vol_args
, arg
, sizeof(vol_args
)))
2136 namelen
= strlen(vol_args
.name
);
2137 if (namelen
> BTRFS_VOL_NAME_MAX
)
2139 if (strchr(vol_args
.name
, '/'))
2142 path
= btrfs_alloc_path();
2146 root_dirid
= root
->fs_info
->sb
->s_root
->d_inode
->i_ino
,
2147 mutex_lock(&root
->fs_info
->fs_mutex
);
2148 di
= btrfs_lookup_dir_item(NULL
, root
->fs_info
->tree_root
,
2150 vol_args
.name
, namelen
, 0);
2151 mutex_unlock(&root
->fs_info
->fs_mutex
);
2152 btrfs_free_path(path
);
2153 if (di
&& !IS_ERR(di
))
2158 if (root
== root
->fs_info
->tree_root
)
2159 return create_subvol(root
, vol_args
.name
, namelen
);
2160 return create_snapshot(root
, vol_args
.name
, namelen
);
2163 static int btrfs_ioctl_defrag(struct file
*file
)
2165 struct inode
*inode
= file
->f_path
.dentry
->d_inode
;
2166 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
2168 switch (inode
->i_mode
& S_IFMT
) {
2170 mutex_lock(&root
->fs_info
->fs_mutex
);
2171 btrfs_defrag_root(root
, 0);
2172 btrfs_defrag_root(root
->fs_info
->extent_root
, 0);
2173 mutex_unlock(&root
->fs_info
->fs_mutex
);
2176 btrfs_defrag_file(file
);
2183 long btrfs_ioctl(struct file
*file
, unsigned int
2184 cmd
, unsigned long arg
)
2186 struct btrfs_root
*root
= BTRFS_I(file
->f_path
.dentry
->d_inode
)->root
;
2189 case BTRFS_IOC_SNAP_CREATE
:
2190 return btrfs_ioctl_snap_create(root
, (void __user
*)arg
);
2191 case BTRFS_IOC_DEFRAG
:
2192 return btrfs_ioctl_defrag(file
);
2199 * Called inside transaction, so use GFP_NOFS
2201 struct inode
*btrfs_alloc_inode(struct super_block
*sb
)
2203 struct btrfs_inode
*ei
;
2205 ei
= kmem_cache_alloc(btrfs_inode_cachep
, GFP_NOFS
);
2209 return &ei
->vfs_inode
;
2212 void btrfs_destroy_inode(struct inode
*inode
)
2214 WARN_ON(!list_empty(&inode
->i_dentry
));
2215 WARN_ON(inode
->i_data
.nrpages
);
2217 kmem_cache_free(btrfs_inode_cachep
, BTRFS_I(inode
));
2220 #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23)
2221 static void init_once(struct kmem_cache
* cachep
, void *foo
)
2223 static void init_once(void * foo
, struct kmem_cache
* cachep
,
2224 unsigned long flags
)
2227 struct btrfs_inode
*ei
= (struct btrfs_inode
*) foo
;
2229 inode_init_once(&ei
->vfs_inode
);
2232 void btrfs_destroy_cachep(void)
2234 if (btrfs_inode_cachep
)
2235 kmem_cache_destroy(btrfs_inode_cachep
);
2236 if (btrfs_trans_handle_cachep
)
2237 kmem_cache_destroy(btrfs_trans_handle_cachep
);
2238 if (btrfs_transaction_cachep
)
2239 kmem_cache_destroy(btrfs_transaction_cachep
);
2240 if (btrfs_bit_radix_cachep
)
2241 kmem_cache_destroy(btrfs_bit_radix_cachep
);
2242 if (btrfs_path_cachep
)
2243 kmem_cache_destroy(btrfs_path_cachep
);
2246 struct kmem_cache
*btrfs_cache_create(const char *name
, size_t size
,
2247 unsigned long extra_flags
,
2248 #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23)
2249 void (*ctor
)(struct kmem_cache
*, void *)
2251 void (*ctor
)(void *, struct kmem_cache
*,
2256 return kmem_cache_create(name
, size
, 0, (SLAB_RECLAIM_ACCOUNT
|
2257 SLAB_MEM_SPREAD
| extra_flags
), ctor
2258 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23)
2264 int btrfs_init_cachep(void)
2266 btrfs_inode_cachep
= btrfs_cache_create("btrfs_inode_cache",
2267 sizeof(struct btrfs_inode
),
2269 if (!btrfs_inode_cachep
)
2271 btrfs_trans_handle_cachep
=
2272 btrfs_cache_create("btrfs_trans_handle_cache",
2273 sizeof(struct btrfs_trans_handle
),
2275 if (!btrfs_trans_handle_cachep
)
2277 btrfs_transaction_cachep
= btrfs_cache_create("btrfs_transaction_cache",
2278 sizeof(struct btrfs_transaction
),
2280 if (!btrfs_transaction_cachep
)
2282 btrfs_path_cachep
= btrfs_cache_create("btrfs_path_cache",
2283 sizeof(struct btrfs_path
),
2285 if (!btrfs_path_cachep
)
2287 btrfs_bit_radix_cachep
= btrfs_cache_create("btrfs_radix", 256,
2288 SLAB_DESTROY_BY_RCU
, NULL
);
2289 if (!btrfs_bit_radix_cachep
)
2293 btrfs_destroy_cachep();
2297 static int btrfs_getattr(struct vfsmount
*mnt
,
2298 struct dentry
*dentry
, struct kstat
*stat
)
2300 struct inode
*inode
= dentry
->d_inode
;
2301 generic_fillattr(inode
, stat
);
2302 stat
->blksize
= 256 * 1024;
2306 static int btrfs_rename(struct inode
* old_dir
, struct dentry
*old_dentry
,
2307 struct inode
* new_dir
,struct dentry
*new_dentry
)
2309 struct btrfs_trans_handle
*trans
;
2310 struct btrfs_root
*root
= BTRFS_I(old_dir
)->root
;
2311 struct inode
*new_inode
= new_dentry
->d_inode
;
2312 struct inode
*old_inode
= old_dentry
->d_inode
;
2313 struct timespec ctime
= CURRENT_TIME
;
2314 struct btrfs_path
*path
;
2315 struct btrfs_dir_item
*di
;
2318 if (S_ISDIR(old_inode
->i_mode
) && new_inode
&&
2319 new_inode
->i_size
> BTRFS_EMPTY_DIR_SIZE
) {
2323 mutex_lock(&root
->fs_info
->fs_mutex
);
2324 trans
= btrfs_start_transaction(root
, 1);
2326 btrfs_set_trans_block_group(trans
, new_dir
);
2327 path
= btrfs_alloc_path();
2333 old_dentry
->d_inode
->i_nlink
++;
2334 old_dir
->i_ctime
= old_dir
->i_mtime
= ctime
;
2335 new_dir
->i_ctime
= new_dir
->i_mtime
= ctime
;
2336 old_inode
->i_ctime
= ctime
;
2338 if (S_ISDIR(old_inode
->i_mode
) && old_dir
!= new_dir
) {
2339 struct btrfs_key
*location
= &BTRFS_I(new_dir
)->location
;
2340 struct btrfs_key old_parent_key
;
2341 di
= btrfs_lookup_dir_item(trans
, root
, path
, old_inode
->i_ino
,
2351 btrfs_dir_item_key_to_cpu(path
->nodes
[0], di
, &old_parent_key
);
2352 ret
= btrfs_del_item(trans
, root
, path
);
2356 btrfs_release_path(root
, path
);
2358 di
= btrfs_lookup_dir_index_item(trans
, root
, path
,
2360 old_parent_key
.objectid
,
2370 ret
= btrfs_del_item(trans
, root
, path
);
2374 btrfs_release_path(root
, path
);
2376 ret
= btrfs_insert_dir_item(trans
, root
, "..", 2,
2377 old_inode
->i_ino
, location
,
2384 ret
= btrfs_unlink_trans(trans
, root
, old_dir
, old_dentry
);
2389 new_inode
->i_ctime
= CURRENT_TIME
;
2390 ret
= btrfs_unlink_trans(trans
, root
, new_dir
, new_dentry
);
2394 ret
= btrfs_add_link(trans
, new_dentry
, old_inode
);
2399 btrfs_free_path(path
);
2400 btrfs_end_transaction(trans
, root
);
2401 mutex_unlock(&root
->fs_info
->fs_mutex
);
2405 static int btrfs_symlink(struct inode
*dir
, struct dentry
*dentry
,
2406 const char *symname
)
2408 struct btrfs_trans_handle
*trans
;
2409 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
2410 struct btrfs_path
*path
;
2411 struct btrfs_key key
;
2412 struct inode
*inode
;
2419 struct btrfs_file_extent_item
*ei
;
2420 struct extent_buffer
*leaf
;
2423 name_len
= strlen(symname
) + 1;
2424 if (name_len
> BTRFS_MAX_INLINE_DATA_SIZE(root
))
2425 return -ENAMETOOLONG
;
2426 mutex_lock(&root
->fs_info
->fs_mutex
);
2427 trans
= btrfs_start_transaction(root
, 1);
2428 btrfs_set_trans_block_group(trans
, dir
);
2430 err
= btrfs_find_free_objectid(trans
, root
, dir
->i_ino
, &objectid
);
2436 inode
= btrfs_new_inode(trans
, root
, objectid
,
2437 BTRFS_I(dir
)->block_group
, S_IFLNK
|S_IRWXUGO
);
2438 err
= PTR_ERR(inode
);
2442 btrfs_set_trans_block_group(trans
, inode
);
2443 err
= btrfs_add_nondir(trans
, dentry
, inode
);
2447 inode
->i_mapping
->a_ops
= &btrfs_aops
;
2448 inode
->i_fop
= &btrfs_file_operations
;
2449 inode
->i_op
= &btrfs_file_inode_operations
;
2450 extent_map_tree_init(&BTRFS_I(inode
)->extent_tree
,
2451 inode
->i_mapping
, GFP_NOFS
);
2452 BTRFS_I(inode
)->extent_tree
.ops
= &btrfs_extent_map_ops
;
2454 dir
->i_sb
->s_dirt
= 1;
2455 btrfs_update_inode_block_group(trans
, inode
);
2456 btrfs_update_inode_block_group(trans
, dir
);
2460 path
= btrfs_alloc_path();
2462 key
.objectid
= inode
->i_ino
;
2464 btrfs_set_key_type(&key
, BTRFS_EXTENT_DATA_KEY
);
2465 datasize
= btrfs_file_extent_calc_inline_size(name_len
);
2466 err
= btrfs_insert_empty_item(trans
, root
, path
, &key
,
2472 leaf
= path
->nodes
[0];
2473 ei
= btrfs_item_ptr(leaf
, path
->slots
[0],
2474 struct btrfs_file_extent_item
);
2475 btrfs_set_file_extent_generation(leaf
, ei
, trans
->transid
);
2476 btrfs_set_file_extent_type(leaf
, ei
,
2477 BTRFS_FILE_EXTENT_INLINE
);
2478 ptr
= btrfs_file_extent_inline_start(ei
);
2479 write_extent_buffer(leaf
, symname
, ptr
, name_len
);
2480 btrfs_mark_buffer_dirty(leaf
);
2481 btrfs_free_path(path
);
2483 inode
->i_op
= &btrfs_symlink_inode_operations
;
2484 inode
->i_mapping
->a_ops
= &btrfs_symlink_aops
;
2485 inode
->i_size
= name_len
- 1;
2486 err
= btrfs_update_inode(trans
, root
, inode
);
2491 nr
= trans
->blocks_used
;
2492 btrfs_end_transaction(trans
, root
);
2493 mutex_unlock(&root
->fs_info
->fs_mutex
);
2495 inode_dec_link_count(inode
);
2498 btrfs_btree_balance_dirty(root
, nr
);
2502 static struct inode_operations btrfs_dir_inode_operations
= {
2503 .lookup
= btrfs_lookup
,
2504 .create
= btrfs_create
,
2505 .unlink
= btrfs_unlink
,
2507 .mkdir
= btrfs_mkdir
,
2508 .rmdir
= btrfs_rmdir
,
2509 .rename
= btrfs_rename
,
2510 .symlink
= btrfs_symlink
,
2511 .setattr
= btrfs_setattr
,
2512 .mknod
= btrfs_mknod
,
2515 static struct inode_operations btrfs_dir_ro_inode_operations
= {
2516 .lookup
= btrfs_lookup
,
2519 static struct file_operations btrfs_dir_file_operations
= {
2520 .llseek
= generic_file_llseek
,
2521 .read
= generic_read_dir
,
2522 .readdir
= btrfs_readdir
,
2523 .unlocked_ioctl
= btrfs_ioctl
,
2524 #ifdef CONFIG_COMPAT
2525 .compat_ioctl
= btrfs_ioctl
,
2529 static struct extent_map_ops btrfs_extent_map_ops
= {
2530 .fill_delalloc
= run_delalloc_range
,
2531 .writepage_io_hook
= btrfs_writepage_io_hook
,
2532 .readpage_io_hook
= btrfs_readpage_io_hook
,
2533 .readpage_end_io_hook
= btrfs_readpage_end_io_hook
,
2536 static struct address_space_operations btrfs_aops
= {
2537 .readpage
= btrfs_readpage
,
2538 .writepage
= btrfs_writepage
,
2539 .writepages
= btrfs_writepages
,
2540 .sync_page
= block_sync_page
,
2541 .prepare_write
= btrfs_prepare_write
,
2542 .commit_write
= btrfs_commit_write
,
2544 .invalidatepage
= btrfs_invalidatepage
,
2545 .releasepage
= btrfs_releasepage
,
2546 .set_page_dirty
= __set_page_dirty_nobuffers
,
2549 static struct address_space_operations btrfs_symlink_aops
= {
2550 .readpage
= btrfs_readpage
,
2551 .writepage
= btrfs_writepage
,
2552 .invalidatepage
= btrfs_invalidatepage
,
2553 .releasepage
= btrfs_releasepage
,
2556 static struct inode_operations btrfs_file_inode_operations
= {
2557 .truncate
= btrfs_truncate
,
2558 .getattr
= btrfs_getattr
,
2559 .setattr
= btrfs_setattr
,
2562 static struct inode_operations btrfs_special_inode_operations
= {
2563 .getattr
= btrfs_getattr
,
2564 .setattr
= btrfs_setattr
,
2567 static struct inode_operations btrfs_symlink_inode_operations
= {
2568 .readlink
= generic_readlink
,
2569 .follow_link
= page_follow_link_light
,
2570 .put_link
= page_put_link
,