1 #include <linux/module.h>
2 #include <linux/buffer_head.h>
4 #include <linux/pagemap.h>
5 #include <linux/highmem.h>
6 #include <linux/time.h>
7 #include <linux/init.h>
8 #include <linux/string.h>
9 #include <linux/smp_lock.h>
10 #include <linux/backing-dev.h>
11 #include <linux/mpage.h>
12 #include <linux/swap.h>
13 #include <linux/writeback.h>
16 #include "transaction.h"
17 #include "btrfs_inode.h"
19 #define BTRFS_SUPER_MAGIC 0x9123682E
21 static struct inode_operations btrfs_dir_inode_operations
;
22 static struct super_operations btrfs_super_ops
;
23 static struct file_operations btrfs_dir_file_operations
;
24 static struct inode_operations btrfs_file_inode_operations
;
25 static struct address_space_operations btrfs_aops
;
26 static struct file_operations btrfs_file_operations
;
28 static int check_inode(struct inode
*inode
)
30 struct btrfs_inode
*ei
= BTRFS_I(inode
);
31 WARN_ON(ei
->magic
!= 0xDEADBEEF);
32 WARN_ON(ei
->magic2
!= 0xDEADBEAF);
36 static void btrfs_read_locked_inode(struct inode
*inode
)
38 struct btrfs_path
*path
;
39 struct btrfs_inode_item
*inode_item
;
40 struct btrfs_root
*root
= btrfs_sb(inode
->i_sb
);
43 path
= btrfs_alloc_path();
45 btrfs_init_path(path
);
46 mutex_lock(&root
->fs_info
->fs_mutex
);
49 ret
= btrfs_lookup_inode(NULL
, root
, path
, inode
->i_ino
, 0);
51 btrfs_release_path(root
, path
);
52 btrfs_free_path(path
);
53 mutex_unlock(&root
->fs_info
->fs_mutex
);
54 make_bad_inode(inode
);
58 inode_item
= btrfs_item_ptr(btrfs_buffer_leaf(path
->nodes
[0]),
60 struct btrfs_inode_item
);
62 inode
->i_mode
= btrfs_inode_mode(inode_item
);
63 inode
->i_nlink
= btrfs_inode_nlink(inode_item
);
64 inode
->i_uid
= btrfs_inode_uid(inode_item
);
65 inode
->i_gid
= btrfs_inode_gid(inode_item
);
66 inode
->i_size
= btrfs_inode_size(inode_item
);
67 inode
->i_atime
.tv_sec
= btrfs_timespec_sec(&inode_item
->atime
);
68 inode
->i_atime
.tv_nsec
= btrfs_timespec_nsec(&inode_item
->atime
);
69 inode
->i_mtime
.tv_sec
= btrfs_timespec_sec(&inode_item
->mtime
);
70 inode
->i_mtime
.tv_nsec
= btrfs_timespec_nsec(&inode_item
->mtime
);
71 inode
->i_ctime
.tv_sec
= btrfs_timespec_sec(&inode_item
->ctime
);
72 inode
->i_ctime
.tv_nsec
= btrfs_timespec_nsec(&inode_item
->ctime
);
73 inode
->i_blocks
= btrfs_inode_nblocks(inode_item
);
74 inode
->i_generation
= btrfs_inode_generation(inode_item
);
76 btrfs_release_path(root
, path
);
77 btrfs_free_path(path
);
80 mutex_unlock(&root
->fs_info
->fs_mutex
);
82 switch (inode
->i_mode
& S_IFMT
) {
85 init_special_inode(inode
, inode
->i_mode
,
86 btrfs_inode_rdev(inode_item
));
90 inode
->i_mapping
->a_ops
= &btrfs_aops
;
91 inode
->i_fop
= &btrfs_file_operations
;
92 inode
->i_op
= &btrfs_file_inode_operations
;
95 inode
->i_op
= &btrfs_dir_inode_operations
;
96 inode
->i_fop
= &btrfs_dir_file_operations
;
99 // inode->i_op = &page_symlink_inode_operations;
106 static int btrfs_unlink_trans(struct btrfs_trans_handle
*trans
,
107 struct btrfs_root
*root
,
109 struct dentry
*dentry
)
111 struct btrfs_path
*path
;
112 const char *name
= dentry
->d_name
.name
;
113 int name_len
= dentry
->d_name
.len
;
116 struct btrfs_dir_item
*di
;
118 path
= btrfs_alloc_path();
120 btrfs_init_path(path
);
121 ret
= btrfs_lookup_dir_item(trans
, root
, path
, dir
->i_ino
,
129 di
= btrfs_item_ptr(btrfs_buffer_leaf(path
->nodes
[0]), path
->slots
[0],
130 struct btrfs_dir_item
);
131 objectid
= btrfs_dir_objectid(di
);
133 ret
= btrfs_del_item(trans
, root
, path
);
135 dentry
->d_inode
->i_ctime
= dir
->i_ctime
;
137 btrfs_release_path(root
, path
);
138 btrfs_free_path(path
);
140 inode_dec_link_count(dentry
->d_inode
);
141 dir
->i_size
-= name_len
;
142 mark_inode_dirty(dir
);
147 static int btrfs_unlink(struct inode
*dir
, struct dentry
*dentry
)
149 struct btrfs_root
*root
;
150 struct btrfs_trans_handle
*trans
;
153 root
= btrfs_sb(dir
->i_sb
);
154 mutex_lock(&root
->fs_info
->fs_mutex
);
155 trans
= btrfs_start_transaction(root
, 1);
156 ret
= btrfs_unlink_trans(trans
, root
, dir
, dentry
);
157 btrfs_end_transaction(trans
, root
);
158 mutex_unlock(&root
->fs_info
->fs_mutex
);
162 static int btrfs_rmdir(struct inode
*dir
, struct dentry
*dentry
)
164 struct inode
*inode
= dentry
->d_inode
;
167 struct btrfs_root
*root
= btrfs_sb(dir
->i_sb
);
168 struct btrfs_path
*path
;
169 struct btrfs_key key
;
170 struct btrfs_trans_handle
*trans
;
171 struct btrfs_disk_key
*found_key
;
172 struct btrfs_leaf
*leaf
;
174 path
= btrfs_alloc_path();
176 btrfs_init_path(path
);
177 mutex_lock(&root
->fs_info
->fs_mutex
);
178 trans
= btrfs_start_transaction(root
, 1);
179 key
.objectid
= inode
->i_ino
;
180 key
.offset
= (u64
)-1;
182 btrfs_set_key_type(&key
, BTRFS_DIR_ITEM_KEY
);
183 ret
= btrfs_search_slot(trans
, root
, &key
, path
, -1, 1);
190 BUG_ON(path
->slots
[0] == 0);
192 leaf
= btrfs_buffer_leaf(path
->nodes
[0]);
193 found_key
= &leaf
->items
[path
->slots
[0]].key
;
194 if (btrfs_disk_key_objectid(found_key
) != inode
->i_ino
) {
198 if (btrfs_disk_key_type(found_key
) != BTRFS_DIR_ITEM_KEY
||
199 btrfs_disk_key_offset(found_key
) != 2) {
203 ret
= btrfs_del_item(trans
, root
, path
);
205 btrfs_release_path(root
, path
);
207 ret
= btrfs_search_slot(trans
, root
, &key
, path
, -1, 1);
216 ret
= btrfs_del_item(trans
, root
, path
);
221 btrfs_release_path(root
, path
);
223 /* now the directory is empty */
224 err
= btrfs_unlink_trans(trans
, root
, dir
, dentry
);
229 btrfs_release_path(root
, path
);
230 btrfs_free_path(path
);
231 mutex_unlock(&root
->fs_info
->fs_mutex
);
232 ret
= btrfs_end_transaction(trans
, root
);
238 static int btrfs_free_inode(struct btrfs_trans_handle
*trans
,
239 struct btrfs_root
*root
,
242 u64 objectid
= inode
->i_ino
;
243 struct btrfs_path
*path
;
244 struct btrfs_inode_map_item
*map
;
245 struct btrfs_key stat_data_key
;
250 path
= btrfs_alloc_path();
252 btrfs_init_path(path
);
253 ret
= btrfs_lookup_inode_map(trans
, root
, path
, objectid
, -1);
259 map
= btrfs_item_ptr(btrfs_buffer_leaf(path
->nodes
[0]), path
->slots
[0],
260 struct btrfs_inode_map_item
);
261 btrfs_disk_key_to_cpu(&stat_data_key
, &map
->key
);
262 ret
= btrfs_del_item(trans
, root
->fs_info
->inode_root
, path
);
264 btrfs_release_path(root
, path
);
266 ret
= btrfs_lookup_inode(trans
, root
, path
, objectid
, -1);
268 ret
= btrfs_del_item(trans
, root
, path
);
271 btrfs_release_path(root
, path
);
272 btrfs_free_path(path
);
276 static int btrfs_truncate_in_trans(struct btrfs_trans_handle
*trans
,
277 struct btrfs_root
*root
,
281 struct btrfs_path
*path
;
282 struct btrfs_key key
;
283 struct btrfs_disk_key
*found_key
;
284 struct btrfs_leaf
*leaf
;
285 struct btrfs_file_extent_item
*fi
= NULL
;
286 u64 extent_start
= 0;
287 u64 extent_num_blocks
= 0;
290 path
= btrfs_alloc_path();
292 /* FIXME, add redo link to tree so we don't leak on crash */
293 key
.objectid
= inode
->i_ino
;
294 key
.offset
= (u64
)-1;
297 * use BTRFS_CSUM_ITEM_KEY because it is larger than inline keys
300 btrfs_set_key_type(&key
, BTRFS_CSUM_ITEM_KEY
);
302 btrfs_init_path(path
);
303 ret
= btrfs_search_slot(trans
, root
, &key
, path
, -1, 1);
308 BUG_ON(path
->slots
[0] == 0);
311 leaf
= btrfs_buffer_leaf(path
->nodes
[0]);
312 found_key
= &leaf
->items
[path
->slots
[0]].key
;
313 if (btrfs_disk_key_objectid(found_key
) != inode
->i_ino
)
315 if (btrfs_disk_key_type(found_key
) != BTRFS_CSUM_ITEM_KEY
&&
316 btrfs_disk_key_type(found_key
) != BTRFS_INLINE_DATA_KEY
&&
317 btrfs_disk_key_type(found_key
) != BTRFS_EXTENT_DATA_KEY
)
319 if (btrfs_disk_key_offset(found_key
) < inode
->i_size
)
321 if (btrfs_disk_key_type(found_key
) == BTRFS_EXTENT_DATA_KEY
) {
322 fi
= btrfs_item_ptr(btrfs_buffer_leaf(path
->nodes
[0]),
324 struct btrfs_file_extent_item
);
325 extent_start
= btrfs_file_extent_disk_blocknr(fi
);
327 btrfs_file_extent_disk_num_blocks(fi
);
329 btrfs_file_extent_num_blocks(fi
) >> 9;
334 ret
= btrfs_del_item(trans
, root
, path
);
336 btrfs_release_path(root
, path
);
338 ret
= btrfs_free_extent(trans
, root
, extent_start
,
339 extent_num_blocks
, 0);
345 btrfs_release_path(root
, path
);
346 btrfs_free_path(path
);
350 static void btrfs_delete_inode(struct inode
*inode
)
352 struct btrfs_trans_handle
*trans
;
353 struct btrfs_root
*root
= btrfs_sb(inode
->i_sb
);
356 truncate_inode_pages(&inode
->i_data
, 0);
357 if (is_bad_inode(inode
)) {
361 mutex_lock(&root
->fs_info
->fs_mutex
);
362 trans
= btrfs_start_transaction(root
, 1);
363 if (S_ISREG(inode
->i_mode
)) {
364 ret
= btrfs_truncate_in_trans(trans
, root
, inode
);
367 btrfs_free_inode(trans
, root
, inode
);
368 btrfs_end_transaction(trans
, root
);
369 mutex_unlock(&root
->fs_info
->fs_mutex
);
375 static int btrfs_inode_by_name(struct inode
*dir
, struct dentry
*dentry
,
378 const char *name
= dentry
->d_name
.name
;
379 int namelen
= dentry
->d_name
.len
;
380 struct btrfs_dir_item
*di
;
381 struct btrfs_path
*path
;
382 struct btrfs_root
*root
= btrfs_sb(dir
->i_sb
);
385 path
= btrfs_alloc_path();
387 btrfs_init_path(path
);
388 ret
= btrfs_lookup_dir_item(NULL
, root
, path
, dir
->i_ino
, name
,
390 if (ret
|| !btrfs_match_dir_item_name(root
, path
, name
, namelen
)) {
395 di
= btrfs_item_ptr(btrfs_buffer_leaf(path
->nodes
[0]), path
->slots
[0],
396 struct btrfs_dir_item
);
397 *ino
= btrfs_dir_objectid(di
);
399 btrfs_release_path(root
, path
);
400 btrfs_free_path(path
);
405 static struct dentry
*btrfs_lookup(struct inode
*dir
, struct dentry
*dentry
,
406 struct nameidata
*nd
)
408 struct inode
* inode
;
409 struct btrfs_root
*root
= btrfs_sb(dir
->i_sb
);
413 if (dentry
->d_name
.len
> BTRFS_NAME_LEN
)
414 return ERR_PTR(-ENAMETOOLONG
);
415 mutex_lock(&root
->fs_info
->fs_mutex
);
416 ret
= btrfs_inode_by_name(dir
, dentry
, &ino
);
417 mutex_unlock(&root
->fs_info
->fs_mutex
);
422 inode
= iget(dir
->i_sb
, ino
);
424 return ERR_PTR(-EACCES
);
428 return d_splice_alias(inode
, dentry
);
431 static int btrfs_readdir(struct file
*filp
, void *dirent
, filldir_t filldir
)
433 struct inode
*inode
= filp
->f_path
.dentry
->d_inode
;
434 struct btrfs_root
*root
= btrfs_sb(inode
->i_sb
);
435 struct btrfs_item
*item
;
436 struct btrfs_dir_item
*di
;
437 struct btrfs_key key
;
438 struct btrfs_path
*path
;
441 struct btrfs_leaf
*leaf
;
444 unsigned char d_type
= DT_UNKNOWN
;
447 mutex_lock(&root
->fs_info
->fs_mutex
);
448 key
.objectid
= inode
->i_ino
;
450 btrfs_set_key_type(&key
, BTRFS_DIR_INDEX_KEY
);
451 key
.offset
= filp
->f_pos
;
452 path
= btrfs_alloc_path();
453 btrfs_init_path(path
);
454 ret
= btrfs_search_slot(NULL
, root
, &key
, path
, 0, 0);
460 leaf
= btrfs_buffer_leaf(path
->nodes
[0]);
461 nritems
= btrfs_header_nritems(&leaf
->header
);
462 slot
= path
->slots
[0];
463 if (advance
|| slot
>= nritems
) {
464 if (slot
>= nritems
-1) {
465 ret
= btrfs_next_leaf(root
, path
);
468 leaf
= btrfs_buffer_leaf(path
->nodes
[0]);
469 nritems
= btrfs_header_nritems(&leaf
->header
);
470 slot
= path
->slots
[0];
477 item
= leaf
->items
+ slot
;
478 if (btrfs_disk_key_objectid(&item
->key
) != key
.objectid
)
480 if (btrfs_disk_key_type(&item
->key
) != BTRFS_DIR_INDEX_KEY
)
482 if (btrfs_disk_key_offset(&item
->key
) < filp
->f_pos
)
486 di
= btrfs_item_ptr(leaf
, slot
, struct btrfs_dir_item
);
487 over
= filldir(dirent
, (const char *)(di
+ 1),
488 btrfs_dir_name_len(di
),
489 btrfs_disk_key_offset(&item
->key
),
490 btrfs_dir_objectid(di
), d_type
);
492 filp
->f_pos
= btrfs_disk_key_offset(&item
->key
);
495 filp
->f_pos
= btrfs_disk_key_offset(&item
->key
) + 1;
499 btrfs_release_path(root
, path
);
500 btrfs_free_path(path
);
501 mutex_unlock(&root
->fs_info
->fs_mutex
);
505 static void btrfs_put_super (struct super_block
* sb
)
507 struct btrfs_root
*root
= btrfs_sb(sb
);
510 ret
= close_ctree(root
);
512 printk("close ctree returns %d\n", ret
);
514 sb
->s_fs_info
= NULL
;
517 static int btrfs_fill_super(struct super_block
* sb
, void * data
, int silent
)
519 struct inode
* inode
;
520 struct dentry
* root_dentry
;
521 struct btrfs_super_block
*disk_super
;
522 struct btrfs_root
*root
;
524 sb
->s_maxbytes
= MAX_LFS_FILESIZE
;
525 sb
->s_magic
= BTRFS_SUPER_MAGIC
;
526 sb
->s_op
= &btrfs_super_ops
;
529 root
= open_ctree(sb
);
532 printk("btrfs: open_ctree failed\n");
535 sb
->s_fs_info
= root
;
536 disk_super
= root
->fs_info
->disk_super
;
537 printk("read in super total blocks %Lu root %Lu\n",
538 btrfs_super_total_blocks(disk_super
),
539 btrfs_super_root_dir(disk_super
));
541 inode
= iget_locked(sb
, btrfs_super_root_dir(disk_super
));
544 if (inode
->i_state
& I_NEW
) {
545 btrfs_read_locked_inode(inode
);
546 unlock_new_inode(inode
);
549 root_dentry
= d_alloc_root(inode
);
554 sb
->s_root
= root_dentry
;
559 static void fill_inode_item(struct btrfs_inode_item
*item
,
562 btrfs_set_inode_uid(item
, inode
->i_uid
);
563 btrfs_set_inode_gid(item
, inode
->i_gid
);
564 btrfs_set_inode_size(item
, inode
->i_size
);
565 btrfs_set_inode_mode(item
, inode
->i_mode
);
566 btrfs_set_inode_nlink(item
, inode
->i_nlink
);
567 btrfs_set_timespec_sec(&item
->atime
, inode
->i_atime
.tv_sec
);
568 btrfs_set_timespec_nsec(&item
->atime
, inode
->i_atime
.tv_nsec
);
569 btrfs_set_timespec_sec(&item
->mtime
, inode
->i_mtime
.tv_sec
);
570 btrfs_set_timespec_nsec(&item
->mtime
, inode
->i_mtime
.tv_nsec
);
571 btrfs_set_timespec_sec(&item
->ctime
, inode
->i_ctime
.tv_sec
);
572 btrfs_set_timespec_nsec(&item
->ctime
, inode
->i_ctime
.tv_nsec
);
573 btrfs_set_inode_nblocks(item
, inode
->i_blocks
);
574 btrfs_set_inode_generation(item
, inode
->i_generation
);
578 static int btrfs_update_inode(struct btrfs_trans_handle
*trans
,
579 struct btrfs_root
*root
,
582 struct btrfs_inode_item
*inode_item
;
583 struct btrfs_path
*path
;
586 path
= btrfs_alloc_path();
588 btrfs_init_path(path
);
590 ret
= btrfs_lookup_inode(trans
, root
, path
, inode
->i_ino
, 1);
597 inode_item
= btrfs_item_ptr(btrfs_buffer_leaf(path
->nodes
[0]),
599 struct btrfs_inode_item
);
601 fill_inode_item(inode_item
, inode
);
602 btrfs_mark_buffer_dirty(path
->nodes
[0]);
604 btrfs_release_path(root
, path
);
605 btrfs_free_path(path
);
610 static int btrfs_write_inode(struct inode
*inode
, int wait
)
612 struct btrfs_root
*root
= btrfs_sb(inode
->i_sb
);
613 struct btrfs_trans_handle
*trans
;
616 mutex_lock(&root
->fs_info
->fs_mutex
);
617 trans
= btrfs_start_transaction(root
, 1);
618 ret
= btrfs_update_inode(trans
, root
, inode
);
620 btrfs_commit_transaction(trans
, root
);
622 btrfs_end_transaction(trans
, root
);
623 mutex_unlock(&root
->fs_info
->fs_mutex
);
628 static struct inode
*btrfs_new_inode(struct btrfs_trans_handle
*trans
,
629 struct inode
*dir
, int mode
)
632 struct btrfs_inode_item inode_item
;
633 struct btrfs_root
*root
= btrfs_sb(dir
->i_sb
);
634 struct btrfs_key key
;
638 inode
= new_inode(dir
->i_sb
);
640 return ERR_PTR(-ENOMEM
);
643 ret
= btrfs_find_free_objectid(trans
, root
, dir
->i_ino
, &objectid
);
646 inode
->i_uid
= current
->fsuid
;
647 inode
->i_gid
= current
->fsgid
;
648 inode
->i_mode
= mode
;
649 inode
->i_ino
= objectid
;
651 inode
->i_mtime
= inode
->i_atime
= inode
->i_ctime
= CURRENT_TIME_SEC
;
652 fill_inode_item(&inode_item
, inode
);
654 key
.objectid
= objectid
;
657 btrfs_set_key_type(&key
, BTRFS_INODE_ITEM_KEY
);
658 ret
= btrfs_insert_inode_map(trans
, root
, objectid
, &key
);
661 ret
= btrfs_insert_inode(trans
, root
, objectid
, &inode_item
);
664 insert_inode_hash(inode
);
670 static int btrfs_add_link(struct btrfs_trans_handle
*trans
,
671 struct dentry
*dentry
, struct inode
*inode
)
674 ret
= btrfs_insert_dir_item(trans
, btrfs_sb(inode
->i_sb
),
675 dentry
->d_name
.name
, dentry
->d_name
.len
,
676 dentry
->d_parent
->d_inode
->i_ino
,
679 dentry
->d_parent
->d_inode
->i_size
+= dentry
->d_name
.len
;
680 ret
= btrfs_update_inode(trans
, btrfs_sb(inode
->i_sb
),
681 dentry
->d_parent
->d_inode
);
684 check_inode(dentry
->d_parent
->d_inode
);
688 static int btrfs_add_nondir(struct btrfs_trans_handle
*trans
,
689 struct dentry
*dentry
, struct inode
*inode
)
691 int err
= btrfs_add_link(trans
, dentry
, inode
);
693 d_instantiate(dentry
, inode
);
702 static int btrfs_create(struct inode
*dir
, struct dentry
*dentry
,
703 int mode
, struct nameidata
*nd
)
705 struct btrfs_trans_handle
*trans
;
706 struct btrfs_root
*root
= btrfs_sb(dir
->i_sb
);
711 mutex_lock(&root
->fs_info
->fs_mutex
);
712 trans
= btrfs_start_transaction(root
, 1);
713 inode
= btrfs_new_inode(trans
, dir
, mode
);
714 err
= PTR_ERR(inode
);
717 // FIXME mark the inode dirty
718 err
= btrfs_add_nondir(trans
, dentry
, inode
);
722 inode
->i_mapping
->a_ops
= &btrfs_aops
;
723 inode
->i_fop
= &btrfs_file_operations
;
724 inode
->i_op
= &btrfs_file_inode_operations
;
726 dir
->i_sb
->s_dirt
= 1;
728 btrfs_end_transaction(trans
, root
);
729 mutex_unlock(&root
->fs_info
->fs_mutex
);
734 inode_dec_link_count(inode
);
740 static int btrfs_make_empty_dir(struct btrfs_trans_handle
*trans
,
741 struct inode
*inode
, struct inode
*dir
)
743 struct btrfs_root
*root
= btrfs_sb(inode
->i_sb
);
749 ret
= btrfs_insert_dir_item(trans
, root
, buf
, 1, inode
->i_ino
,
753 ret
= btrfs_insert_dir_item(trans
, root
, buf
, 2, inode
->i_ino
,
758 ret
= btrfs_update_inode(trans
, root
, inode
);
763 static int btrfs_mkdir(struct inode
*dir
, struct dentry
*dentry
, int mode
)
766 struct btrfs_trans_handle
*trans
;
767 struct btrfs_root
*root
= btrfs_sb(dir
->i_sb
);
771 mutex_lock(&root
->fs_info
->fs_mutex
);
772 trans
= btrfs_start_transaction(root
, 1);
774 err
= PTR_ERR(trans
);
777 inode
= btrfs_new_inode(trans
, dir
, S_IFDIR
| mode
);
779 err
= PTR_ERR(inode
);
783 inode
->i_op
= &btrfs_dir_inode_operations
;
784 inode
->i_fop
= &btrfs_dir_file_operations
;
786 err
= btrfs_make_empty_dir(trans
, inode
, dir
);
789 err
= btrfs_add_link(trans
, dentry
, inode
);
792 d_instantiate(dentry
, inode
);
796 btrfs_end_transaction(trans
, root
);
798 mutex_unlock(&root
->fs_info
->fs_mutex
);
804 static int btrfs_sync_fs(struct super_block
*sb
, int wait
)
806 struct btrfs_trans_handle
*trans
;
807 struct btrfs_root
*root
;
813 filemap_flush(root
->fs_info
->btree_inode
->i_mapping
);
816 filemap_write_and_wait(root
->fs_info
->btree_inode
->i_mapping
);
817 mutex_lock(&root
->fs_info
->fs_mutex
);
818 trans
= btrfs_start_transaction(root
, 1);
819 ret
= btrfs_commit_transaction(trans
, root
);
822 printk("btrfs sync_fs\n");
823 mutex_unlock(&root
->fs_info
->fs_mutex
);
828 static int btrfs_get_block_inline(struct inode
*inode
, sector_t iblock
,
829 struct buffer_head
*result
, int create
)
831 struct btrfs_root
*root
= btrfs_sb(inode
->i_sb
);
832 struct btrfs_path
*path
;
833 struct btrfs_key key
;
834 struct btrfs_leaf
*leaf
;
835 int num_bytes
= result
->b_size
;
845 path
= btrfs_alloc_path();
852 pos
= iblock
<< inode
->i_blkbits
;
853 key
.objectid
= inode
->i_ino
;
855 btrfs_set_key_type(&key
, BTRFS_INLINE_DATA_KEY
);
856 ptr
= kmap(result
->b_page
);
858 ptr
+= (pos
& (PAGE_CACHE_SIZE
-1));
861 ret
= btrfs_search_slot(NULL
, root
, &key
, path
, 0, 0);
869 leaf
= btrfs_buffer_leaf(path
->nodes
[0]);
870 item_size
= btrfs_item_size(leaf
->items
+ path
->slots
[0]);
871 copy_size
= min(num_bytes
, item_size
);
872 data_ptr
= btrfs_item_ptr(leaf
, path
->slots
[0], char);
873 WARN_ON(safe_ptr
+ PAGE_CACHE_SIZE
< ptr
+ copy_size
);
874 memcpy(ptr
, data_ptr
, copy_size
);
876 num_bytes
-= copy_size
;
877 WARN_ON(num_bytes
< 0);
879 btrfs_release_path(root
, path
);
880 if (num_bytes
!= 0) {
881 if (pos
>= i_size_read(inode
))
882 memset(ptr
, 0, num_bytes
);
886 set_buffer_uptodate(result
);
887 map_bh(result
, inode
->i_sb
, 0);
890 btrfs_free_path(path
);
891 kunmap(result
->b_page
);
896 static int btrfs_get_block_lock(struct inode
*inode
, sector_t iblock
,
897 struct buffer_head
*result
, int create
)
902 u64 extent_start
= 0;
904 u64 objectid
= inode
->i_ino
;
905 struct btrfs_path
*path
;
906 struct btrfs_root
*root
= btrfs_sb(inode
->i_sb
);
907 struct btrfs_trans_handle
*trans
= NULL
;
908 struct btrfs_file_extent_item
*item
;
909 struct btrfs_leaf
*leaf
;
910 struct btrfs_disk_key
*found_key
;
912 path
= btrfs_alloc_path();
914 btrfs_init_path(path
);
916 trans
= btrfs_start_transaction(root
, 1);
919 ret
= btrfs_lookup_file_extent(trans
, root
, path
,
921 iblock
<< inode
->i_blkbits
, 0);
928 if (path
->slots
[0] == 0) {
929 btrfs_release_path(root
, path
);
935 item
= btrfs_item_ptr(btrfs_buffer_leaf(path
->nodes
[0]), path
->slots
[0],
936 struct btrfs_file_extent_item
);
937 leaf
= btrfs_buffer_leaf(path
->nodes
[0]);
938 blocknr
= btrfs_file_extent_disk_blocknr(item
);
939 blocknr
+= btrfs_file_extent_offset(item
);
941 /* exact match found, use it */
944 map_bh(result
, inode
->i_sb
, blocknr
);
948 /* are we inside the extent that was found? */
949 found_key
= &leaf
->items
[path
->slots
[0]].key
;
950 if (btrfs_disk_key_objectid(found_key
) != objectid
||
951 btrfs_disk_key_type(found_key
) != BTRFS_EXTENT_DATA_KEY
) {
954 btrfs_release_path(root
, path
);
958 extent_start
= btrfs_disk_key_offset(&leaf
->items
[path
->slots
[0]].key
);
959 extent_start
= extent_start
>> inode
->i_blkbits
;
960 extent_start
+= btrfs_file_extent_offset(item
);
961 extent_end
= extent_start
+ btrfs_file_extent_num_blocks(item
);
962 if (iblock
>= extent_start
&& iblock
< extent_end
) {
964 map_bh(result
, inode
->i_sb
, blocknr
+ iblock
- extent_start
);
968 /* ok, create a new extent */
973 ret
= btrfs_alloc_file_extent(trans
, root
, objectid
,
974 iblock
<< inode
->i_blkbits
,
975 1, extent_end
, &blocknr
);
980 inode
->i_blocks
+= inode
->i_sb
->s_blocksize
>> 9;
981 set_buffer_new(result
);
982 map_bh(result
, inode
->i_sb
, blocknr
);
985 btrfs_release_path(root
, path
);
986 btrfs_free_path(path
);
988 btrfs_end_transaction(trans
, root
);
992 static int btrfs_get_block(struct inode
*inode
, sector_t iblock
,
993 struct buffer_head
*result
, int create
)
996 struct btrfs_root
*root
= btrfs_sb(inode
->i_sb
);
997 mutex_lock(&root
->fs_info
->fs_mutex
);
998 err
= btrfs_get_block_lock(inode
, iblock
, result
, create
);
999 // err = btrfs_get_block_inline(inode, iblock, result, create);
1000 mutex_unlock(&root
->fs_info
->fs_mutex
);
1004 static int btrfs_prepare_write(struct file
*file
, struct page
*page
,
1005 unsigned from
, unsigned to
)
1007 return nobh_prepare_write(page
, from
, to
, btrfs_get_block
);
1009 static int btrfs_commit_write(struct file
*file
, struct page
*page
,
1010 unsigned from
, unsigned to
)
1012 return nobh_commit_write(file
, page
, from
, to
);
1015 static void btrfs_write_super(struct super_block
*sb
)
1017 btrfs_sync_fs(sb
, 1);
1020 static int btrfs_readpage(struct file
*file
, struct page
*page
)
1022 return mpage_readpage(page
, btrfs_get_block
);
1025 static int btrfs_readpages(struct file
*file
, struct address_space
*mapping
,
1026 struct list_head
*pages
, unsigned nr_pages
)
1028 return mpage_readpages(mapping
, pages
, nr_pages
, btrfs_get_block
);
1031 static int btrfs_writepage(struct page
*page
, struct writeback_control
*wbc
)
1033 return nobh_writepage(page
, btrfs_get_block
, wbc
);
1036 static void btrfs_truncate(struct inode
*inode
)
1038 struct btrfs_root
*root
= btrfs_sb(inode
->i_sb
);
1040 struct btrfs_trans_handle
*trans
;
1042 if (!S_ISREG(inode
->i_mode
))
1044 if (IS_APPEND(inode
) || IS_IMMUTABLE(inode
))
1047 nobh_truncate_page(inode
->i_mapping
, inode
->i_size
);
1049 /* FIXME, add redo link to tree so we don't leak on crash */
1050 mutex_lock(&root
->fs_info
->fs_mutex
);
1051 trans
= btrfs_start_transaction(root
, 1);
1052 ret
= btrfs_truncate_in_trans(trans
, root
, inode
);
1054 ret
= btrfs_end_transaction(trans
, root
);
1056 mutex_unlock(&root
->fs_info
->fs_mutex
);
1057 mark_inode_dirty(inode
);
1060 static int btrfs_copy_from_user(loff_t pos
, int num_pages
, int write_bytes
,
1061 struct page
**prepared_pages
,
1062 const char __user
* buf
)
1064 long page_fault
= 0;
1066 int offset
= pos
& (PAGE_CACHE_SIZE
- 1);
1068 for (i
= 0; i
< num_pages
&& write_bytes
> 0; i
++, offset
= 0) {
1069 size_t count
= min_t(size_t,
1070 PAGE_CACHE_SIZE
- offset
, write_bytes
);
1071 struct page
*page
= prepared_pages
[i
];
1072 fault_in_pages_readable(buf
, count
);
1074 /* Copy data from userspace to the current page */
1076 page_fault
= __copy_from_user(page_address(page
) + offset
,
1078 /* Flush processor's dcache for this page */
1079 flush_dcache_page(page
);
1082 write_bytes
-= count
;
1087 return page_fault
? -EFAULT
: 0;
1090 static void btrfs_drop_pages(struct page
**pages
, size_t num_pages
)
1093 for (i
= 0; i
< num_pages
; i
++) {
1096 unlock_page(pages
[i
]);
1097 mark_page_accessed(pages
[i
]);
1098 page_cache_release(pages
[i
]);
1101 static int dirty_and_release_pages(struct btrfs_trans_handle
*trans
,
1102 struct btrfs_root
*root
,
1104 struct page
**pages
,
1114 struct inode
*inode
= file
->f_path
.dentry
->d_inode
;
1116 for (i
= 0; i
< num_pages
; i
++) {
1117 offset
= pos
& (PAGE_CACHE_SIZE
-1);
1118 this_write
= min(PAGE_CACHE_SIZE
- offset
, write_bytes
);
1119 /* FIXME, one block at a time */
1121 mutex_lock(&root
->fs_info
->fs_mutex
);
1122 trans
= btrfs_start_transaction(root
, 1);
1123 btrfs_csum_file_block(trans
, root
, inode
->i_ino
,
1124 pages
[i
]->index
<< PAGE_CACHE_SHIFT
,
1125 kmap(pages
[i
]), PAGE_CACHE_SIZE
);
1127 SetPageChecked(pages
[i
]);
1128 ret
= btrfs_end_transaction(trans
, root
);
1130 mutex_unlock(&root
->fs_info
->fs_mutex
);
1132 ret
= nobh_commit_write(file
, pages
[i
], offset
,
1133 offset
+ this_write
);
1139 WARN_ON(this_write
> write_bytes
);
1140 write_bytes
-= this_write
;
1146 static int prepare_pages(struct btrfs_trans_handle
*trans
,
1147 struct btrfs_root
*root
,
1149 struct page
**pages
,
1155 unsigned long index
= pos
>> PAGE_CACHE_SHIFT
;
1156 struct inode
*inode
= file
->f_path
.dentry
->d_inode
;
1161 loff_t isize
= i_size_read(inode
);
1163 memset(pages
, 0, num_pages
* sizeof(struct page
*));
1165 for (i
= 0; i
< num_pages
; i
++) {
1166 pages
[i
] = grab_cache_page(inode
->i_mapping
, index
+ i
);
1169 goto failed_release
;
1171 offset
= pos
& (PAGE_CACHE_SIZE
-1);
1172 this_write
= min(PAGE_CACHE_SIZE
- offset
, write_bytes
);
1173 ret
= nobh_prepare_write(pages
[i
], offset
,
1174 offset
+ this_write
,
1179 goto failed_truncate
;
1181 WARN_ON(this_write
> write_bytes
);
1182 write_bytes
-= this_write
;
1187 btrfs_drop_pages(pages
, num_pages
);
1191 btrfs_drop_pages(pages
, num_pages
);
1193 vmtruncate(inode
, isize
);
1197 static ssize_t
btrfs_file_write(struct file
*file
, const char __user
*buf
,
1198 size_t count
, loff_t
*ppos
)
1201 size_t num_written
= 0;
1204 struct inode
*inode
= file
->f_path
.dentry
->d_inode
;
1205 struct btrfs_root
*root
= btrfs_sb(inode
->i_sb
);
1206 struct page
*pages
[1];
1208 if (file
->f_flags
& O_DIRECT
)
1212 vfs_check_frozen(inode
->i_sb
, SB_FREEZE_WRITE
);
1213 current
->backing_dev_info
= inode
->i_mapping
->backing_dev_info
;
1214 err
= generic_write_checks(file
, &pos
, &count
, S_ISBLK(inode
->i_mode
));
1219 err
= remove_suid(file
->f_path
.dentry
);
1222 file_update_time(file
);
1223 mutex_lock(&inode
->i_mutex
);
1225 size_t offset
= pos
& (PAGE_CACHE_SIZE
- 1);
1226 size_t write_bytes
= min(count
, PAGE_CACHE_SIZE
- offset
);
1227 size_t num_pages
= (write_bytes
+ PAGE_CACHE_SIZE
- 1) >>
1229 ret
= prepare_pages(NULL
, root
, file
, pages
, num_pages
,
1232 ret
= btrfs_copy_from_user(pos
, num_pages
,
1233 write_bytes
, pages
, buf
);
1236 ret
= dirty_and_release_pages(NULL
, root
, file
, pages
,
1237 num_pages
, pos
, write_bytes
);
1239 btrfs_drop_pages(pages
, num_pages
);
1242 count
-= write_bytes
;
1244 num_written
+= write_bytes
;
1246 balance_dirty_pages_ratelimited(inode
->i_mapping
);
1249 mutex_unlock(&inode
->i_mutex
);
1252 current
->backing_dev_info
= NULL
;
1253 return num_written
? num_written
: err
;
1257 static ssize_t
inline_one_page(struct btrfs_root
*root
, struct inode
*inode
,
1258 struct page
*page
, loff_t pos
,
1259 size_t offset
, size_t write_bytes
)
1261 struct btrfs_path
*path
;
1262 struct btrfs_trans_handle
*trans
;
1263 struct btrfs_key key
;
1264 struct btrfs_leaf
*leaf
;
1265 struct btrfs_key found_key
;
1267 size_t copy_size
= 0;
1270 size_t num_written
= 0;
1272 path
= btrfs_alloc_path();
1274 mutex_lock(&root
->fs_info
->fs_mutex
);
1275 trans
= btrfs_start_transaction(root
, 1);
1276 key
.objectid
= inode
->i_ino
;
1278 btrfs_set_key_type(&key
, BTRFS_INLINE_DATA_KEY
);
1282 ret
= btrfs_search_slot(trans
, root
, &key
, path
, 0, 1);
1288 leaf
= btrfs_buffer_leaf(path
->nodes
[0]);
1289 btrfs_disk_key_to_cpu(&found_key
,
1290 &leaf
->items
[path
->slots
[0]].key
);
1291 copy_size
= btrfs_item_size(leaf
->items
+ path
->slots
[0]);
1292 dst
= btrfs_item_ptr(leaf
, path
->slots
[0], char);
1293 copy_size
= min(write_bytes
, copy_size
);
1296 int slot
= path
->slots
[0];
1300 // FIXME find max key
1301 leaf
= btrfs_buffer_leaf(path
->nodes
[0]);
1302 btrfs_disk_key_to_cpu(&found_key
,
1303 &leaf
->items
[slot
].key
);
1304 if (found_key
.objectid
!= inode
->i_ino
)
1306 if (btrfs_key_type(&found_key
) != BTRFS_INLINE_DATA_KEY
)
1308 copy_size
= btrfs_item_size(leaf
->items
+ slot
);
1309 if (found_key
.offset
+ copy_size
<= pos
)
1311 dst
= btrfs_item_ptr(leaf
, path
->slots
[0], char);
1312 dst
+= pos
- found_key
.offset
;
1313 copy_size
= copy_size
- (pos
- found_key
.offset
);
1314 BUG_ON(copy_size
< 0);
1315 copy_size
= min(write_bytes
, copy_size
);
1316 WARN_ON(copy_size
== 0);
1320 btrfs_release_path(root
, path
);
1321 copy_size
= min(write_bytes
,
1322 (size_t)BTRFS_LEAF_DATA_SIZE(root
) -
1323 sizeof(struct btrfs_item
) * 4);
1324 ret
= btrfs_insert_empty_item(trans
, root
, path
, &key
, copy_size
);
1326 dst
= btrfs_item_ptr(btrfs_buffer_leaf(path
->nodes
[0]),
1327 path
->slots
[0], char);
1329 WARN_ON(copy_size
== 0);
1330 WARN_ON(dst
+ copy_size
>
1331 btrfs_item_ptr(btrfs_buffer_leaf(path
->nodes
[0]),
1332 path
->slots
[0], char) +
1333 btrfs_item_size(btrfs_buffer_leaf(path
->nodes
[0])->items
+
1335 btrfs_memcpy(root
, path
->nodes
[0]->b_data
, dst
,
1336 page_address(page
) + offset
, copy_size
);
1337 mark_buffer_dirty(path
->nodes
[0]);
1338 btrfs_release_path(root
, path
);
1340 offset
+= copy_size
;
1341 num_written
+= copy_size
;
1342 write_bytes
-= copy_size
;
1346 btrfs_free_path(path
);
1347 ret
= btrfs_end_transaction(trans
, root
);
1349 mutex_unlock(&root
->fs_info
->fs_mutex
);
1350 return num_written
? num_written
: err
;
1353 static ssize_t
btrfs_file_inline_write(struct file
*file
,
1354 const char __user
*buf
,
1355 size_t count
, loff_t
*ppos
)
1358 size_t num_written
= 0;
1361 struct inode
*inode
= file
->f_path
.dentry
->d_inode
;
1362 struct btrfs_root
*root
= btrfs_sb(inode
->i_sb
);
1363 unsigned long page_index
;
1365 if (file
->f_flags
& O_DIRECT
)
1369 vfs_check_frozen(inode
->i_sb
, SB_FREEZE_WRITE
);
1370 current
->backing_dev_info
= inode
->i_mapping
->backing_dev_info
;
1371 err
= generic_write_checks(file
, &pos
, &count
, S_ISBLK(inode
->i_mode
));
1376 err
= remove_suid(file
->f_path
.dentry
);
1379 file_update_time(file
);
1380 mutex_lock(&inode
->i_mutex
);
1382 size_t offset
= pos
& (PAGE_CACHE_SIZE
- 1);
1383 size_t write_bytes
= min(count
, PAGE_CACHE_SIZE
- offset
);
1386 page_index
= pos
>> PAGE_CACHE_SHIFT
;
1387 page
= grab_cache_page(inode
->i_mapping
, page_index
);
1388 if (!PageUptodate(page
)) {
1389 ret
= mpage_readpage(page
, btrfs_get_block
);
1393 ret
= btrfs_copy_from_user(pos
, 1,
1394 write_bytes
, &page
, buf
);
1396 write_bytes
= inline_one_page(root
, inode
, page
, pos
,
1397 offset
, write_bytes
);
1398 SetPageUptodate(page
);
1399 if (write_bytes
> 0 && pos
+ write_bytes
> inode
->i_size
) {
1400 i_size_write(inode
, pos
+ write_bytes
);
1401 mark_inode_dirty(inode
);
1403 page_cache_release(page
);
1405 if (write_bytes
< 0)
1408 count
-= write_bytes
;
1410 num_written
+= write_bytes
;
1412 balance_dirty_pages_ratelimited(inode
->i_mapping
);
1416 mutex_unlock(&inode
->i_mutex
);
1419 current
->backing_dev_info
= NULL
;
1420 return num_written
? num_written
: err
;
1424 static int btrfs_read_actor(read_descriptor_t
*desc
, struct page
*page
,
1425 unsigned long offset
, unsigned long size
)
1428 unsigned long left
, count
= desc
->count
;
1433 if (!PageChecked(page
)) {
1434 /* FIXME, do it per block */
1435 struct btrfs_root
*root
= btrfs_sb(page
->mapping
->host
->i_sb
);
1436 int ret
= btrfs_csum_verify_file_block(root
,
1437 page
->mapping
->host
->i_ino
,
1438 page
->index
<< PAGE_CACHE_SHIFT
,
1439 kmap(page
), PAGE_CACHE_SIZE
);
1441 printk("failed to verify ino %lu page %lu\n",
1442 page
->mapping
->host
->i_ino
,
1444 memset(page_address(page
), 0, PAGE_CACHE_SIZE
);
1446 SetPageChecked(page
);
1450 * Faults on the destination of a read are common, so do it before
1453 if (!fault_in_pages_writeable(desc
->arg
.buf
, size
)) {
1454 kaddr
= kmap_atomic(page
, KM_USER0
);
1455 left
= __copy_to_user_inatomic(desc
->arg
.buf
,
1456 kaddr
+ offset
, size
);
1457 kunmap_atomic(kaddr
, KM_USER0
);
1462 /* Do it the slow way */
1464 left
= __copy_to_user(desc
->arg
.buf
, kaddr
+ offset
, size
);
1469 desc
->error
= -EFAULT
;
1472 desc
->count
= count
- size
;
1473 desc
->written
+= size
;
1474 desc
->arg
.buf
+= size
;
1479 * btrfs_file_aio_read - filesystem read routine
1480 * @iocb: kernel I/O control block
1481 * @iov: io vector request
1482 * @nr_segs: number of segments in the iovec
1483 * @pos: current file position
1485 static ssize_t
btrfs_file_aio_read(struct kiocb
*iocb
, const struct iovec
*iov
,
1486 unsigned long nr_segs
, loff_t pos
)
1488 struct file
*filp
= iocb
->ki_filp
;
1492 loff_t
*ppos
= &iocb
->ki_pos
;
1495 for (seg
= 0; seg
< nr_segs
; seg
++) {
1496 const struct iovec
*iv
= &iov
[seg
];
1499 * If any segment has a negative length, or the cumulative
1500 * length ever wraps negative then return -EINVAL.
1502 count
+= iv
->iov_len
;
1503 if (unlikely((ssize_t
)(count
|iv
->iov_len
) < 0))
1505 if (access_ok(VERIFY_WRITE
, iv
->iov_base
, iv
->iov_len
))
1510 count
-= iv
->iov_len
; /* This segment is no good */
1515 for (seg
= 0; seg
< nr_segs
; seg
++) {
1516 read_descriptor_t desc
;
1519 desc
.arg
.buf
= iov
[seg
].iov_base
;
1520 desc
.count
= iov
[seg
].iov_len
;
1521 if (desc
.count
== 0)
1524 do_generic_file_read(filp
, ppos
, &desc
,
1526 retval
+= desc
.written
;
1528 retval
= retval
?: desc
.error
;
1536 static struct kmem_cache
*btrfs_inode_cachep
;
1537 struct kmem_cache
*btrfs_trans_handle_cachep
;
1538 struct kmem_cache
*btrfs_transaction_cachep
;
1539 struct kmem_cache
*btrfs_bit_radix_cachep
;
1540 struct kmem_cache
*btrfs_path_cachep
;
1543 * Called inside transaction, so use GFP_NOFS
1545 static struct inode
*btrfs_alloc_inode(struct super_block
*sb
)
1547 struct btrfs_inode
*ei
;
1549 ei
= kmem_cache_alloc(btrfs_inode_cachep
, GFP_NOFS
);
1552 ei
->magic
= 0xDEADBEEF;
1553 ei
->magic2
= 0xDEADBEAF;
1554 return &ei
->vfs_inode
;
1557 static void btrfs_destroy_inode(struct inode
*inode
)
1559 struct btrfs_inode
*ei
= BTRFS_I(inode
);
1560 WARN_ON(ei
->magic
!= 0xDEADBEEF);
1561 WARN_ON(ei
->magic2
!= 0xDEADBEAF);
1562 WARN_ON(!list_empty(&inode
->i_dentry
));
1563 WARN_ON(inode
->i_data
.nrpages
);
1567 kmem_cache_free(btrfs_inode_cachep
, BTRFS_I(inode
));
1570 static void init_once(void * foo
, struct kmem_cache
* cachep
,
1571 unsigned long flags
)
1573 struct btrfs_inode
*ei
= (struct btrfs_inode
*) foo
;
1575 if ((flags
& (SLAB_CTOR_VERIFY
|SLAB_CTOR_CONSTRUCTOR
)) ==
1576 SLAB_CTOR_CONSTRUCTOR
) {
1577 inode_init_once(&ei
->vfs_inode
);
1581 static int init_inodecache(void)
1583 btrfs_inode_cachep
= kmem_cache_create("btrfs_inode_cache",
1584 sizeof(struct btrfs_inode
),
1585 0, (SLAB_RECLAIM_ACCOUNT
|
1588 btrfs_trans_handle_cachep
= kmem_cache_create("btrfs_trans_handle_cache",
1589 sizeof(struct btrfs_trans_handle
),
1590 0, (SLAB_RECLAIM_ACCOUNT
|
1593 btrfs_transaction_cachep
= kmem_cache_create("btrfs_transaction_cache",
1594 sizeof(struct btrfs_transaction
),
1595 0, (SLAB_RECLAIM_ACCOUNT
|
1598 btrfs_path_cachep
= kmem_cache_create("btrfs_path_cache",
1599 sizeof(struct btrfs_transaction
),
1600 0, (SLAB_RECLAIM_ACCOUNT
|
1603 btrfs_bit_radix_cachep
= kmem_cache_create("btrfs_radix",
1605 0, (SLAB_RECLAIM_ACCOUNT
|
1607 SLAB_DESTROY_BY_RCU
),
1609 if (btrfs_inode_cachep
== NULL
|| btrfs_trans_handle_cachep
== NULL
||
1610 btrfs_transaction_cachep
== NULL
|| btrfs_bit_radix_cachep
== NULL
)
1615 static void destroy_inodecache(void)
1617 kmem_cache_destroy(btrfs_inode_cachep
);
1618 kmem_cache_destroy(btrfs_trans_handle_cachep
);
1619 kmem_cache_destroy(btrfs_transaction_cachep
);
1620 kmem_cache_destroy(btrfs_bit_radix_cachep
);
1621 kmem_cache_destroy(btrfs_path_cachep
);
1624 static int btrfs_get_sb(struct file_system_type
*fs_type
,
1625 int flags
, const char *dev_name
, void *data
, struct vfsmount
*mnt
)
1627 return get_sb_bdev(fs_type
, flags
, dev_name
, data
,
1628 btrfs_fill_super
, mnt
);
1631 static struct file_system_type btrfs_fs_type
= {
1632 .owner
= THIS_MODULE
,
1634 .get_sb
= btrfs_get_sb
,
1635 .kill_sb
= kill_block_super
,
1636 .fs_flags
= FS_REQUIRES_DEV
,
1639 static struct super_operations btrfs_super_ops
= {
1640 .statfs
= simple_statfs
,
1641 .delete_inode
= btrfs_delete_inode
,
1642 .put_super
= btrfs_put_super
,
1643 .read_inode
= btrfs_read_locked_inode
,
1644 .write_super
= btrfs_write_super
,
1645 .sync_fs
= btrfs_sync_fs
,
1646 .write_inode
= btrfs_write_inode
,
1647 .alloc_inode
= btrfs_alloc_inode
,
1648 .destroy_inode
= btrfs_destroy_inode
,
1651 static struct inode_operations btrfs_dir_inode_operations
= {
1652 .lookup
= btrfs_lookup
,
1653 .create
= btrfs_create
,
1654 .unlink
= btrfs_unlink
,
1655 .mkdir
= btrfs_mkdir
,
1656 .rmdir
= btrfs_rmdir
,
1659 static struct file_operations btrfs_dir_file_operations
= {
1660 .llseek
= generic_file_llseek
,
1661 .read
= generic_read_dir
,
1662 .readdir
= btrfs_readdir
,
1665 static struct address_space_operations btrfs_aops
= {
1666 .readpage
= btrfs_readpage
,
1667 .readpages
= btrfs_readpages
,
1668 .writepage
= btrfs_writepage
,
1669 .sync_page
= block_sync_page
,
1670 .prepare_write
= btrfs_prepare_write
,
1671 .commit_write
= btrfs_commit_write
,
1674 static struct inode_operations btrfs_file_inode_operations
= {
1675 .truncate
= btrfs_truncate
,
1678 static struct file_operations btrfs_file_operations
= {
1679 .llseek
= generic_file_llseek
,
1680 .read
= do_sync_read
,
1681 .aio_read
= btrfs_file_aio_read
,
1682 .write
= btrfs_file_write
,
1683 .mmap
= generic_file_mmap
,
1684 .open
= generic_file_open
,
1687 static int __init
init_btrfs_fs(void)
1690 printk("btrfs loaded!\n");
1691 err
= init_inodecache();
1694 return register_filesystem(&btrfs_fs_type
);
1697 static void __exit
exit_btrfs_fs(void)
1699 destroy_inodecache();
1700 unregister_filesystem(&btrfs_fs_type
);
1701 printk("btrfs unloaded\n");
1704 module_init(init_btrfs_fs
)
1705 module_exit(exit_btrfs_fs
)
1707 MODULE_LICENSE("GPL");