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"
20 void btrfs_fsinfo_release(struct kobject
*obj
)
22 struct btrfs_fs_info
*fsinfo
= container_of(obj
,
23 struct btrfs_fs_info
, kobj
);
27 struct kobj_type btrfs_fsinfo_ktype
= {
28 .release
= btrfs_fsinfo_release
,
31 struct btrfs_iget_args
{
33 struct btrfs_root
*root
;
36 decl_subsys(btrfs
, &btrfs_fsinfo_ktype
, NULL
);
38 #define BTRFS_SUPER_MAGIC 0x9123682E
40 static struct inode_operations btrfs_dir_inode_operations
;
41 static struct inode_operations btrfs_dir_ro_inode_operations
;
42 static struct super_operations btrfs_super_ops
;
43 static struct file_operations btrfs_dir_file_operations
;
44 static struct inode_operations btrfs_file_inode_operations
;
45 static struct address_space_operations btrfs_aops
;
46 static struct file_operations btrfs_file_operations
;
48 static void btrfs_read_locked_inode(struct inode
*inode
)
50 struct btrfs_path
*path
;
51 struct btrfs_inode_item
*inode_item
;
52 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
53 struct btrfs_key location
;
56 path
= btrfs_alloc_path();
58 btrfs_init_path(path
);
59 mutex_lock(&root
->fs_info
->fs_mutex
);
61 memcpy(&location
, &BTRFS_I(inode
)->location
, sizeof(location
));
62 ret
= btrfs_lookup_inode(NULL
, root
, path
, &location
, 0);
64 btrfs_free_path(path
);
67 inode_item
= btrfs_item_ptr(btrfs_buffer_leaf(path
->nodes
[0]),
69 struct btrfs_inode_item
);
71 inode
->i_mode
= btrfs_inode_mode(inode_item
);
72 inode
->i_nlink
= btrfs_inode_nlink(inode_item
);
73 inode
->i_uid
= btrfs_inode_uid(inode_item
);
74 inode
->i_gid
= btrfs_inode_gid(inode_item
);
75 inode
->i_size
= btrfs_inode_size(inode_item
);
76 inode
->i_atime
.tv_sec
= btrfs_timespec_sec(&inode_item
->atime
);
77 inode
->i_atime
.tv_nsec
= btrfs_timespec_nsec(&inode_item
->atime
);
78 inode
->i_mtime
.tv_sec
= btrfs_timespec_sec(&inode_item
->mtime
);
79 inode
->i_mtime
.tv_nsec
= btrfs_timespec_nsec(&inode_item
->mtime
);
80 inode
->i_ctime
.tv_sec
= btrfs_timespec_sec(&inode_item
->ctime
);
81 inode
->i_ctime
.tv_nsec
= btrfs_timespec_nsec(&inode_item
->ctime
);
82 inode
->i_blocks
= btrfs_inode_nblocks(inode_item
);
83 inode
->i_generation
= btrfs_inode_generation(inode_item
);
85 btrfs_free_path(path
);
88 mutex_unlock(&root
->fs_info
->fs_mutex
);
90 switch (inode
->i_mode
& S_IFMT
) {
93 init_special_inode(inode
, inode
->i_mode
,
94 btrfs_inode_rdev(inode_item
));
98 inode
->i_mapping
->a_ops
= &btrfs_aops
;
99 inode
->i_fop
= &btrfs_file_operations
;
100 inode
->i_op
= &btrfs_file_inode_operations
;
103 inode
->i_fop
= &btrfs_dir_file_operations
;
104 if (root
== root
->fs_info
->tree_root
)
105 inode
->i_op
= &btrfs_dir_ro_inode_operations
;
107 inode
->i_op
= &btrfs_dir_inode_operations
;
110 // inode->i_op = &page_symlink_inode_operations;
116 btrfs_release_path(root
, path
);
117 btrfs_free_path(path
);
118 mutex_unlock(&root
->fs_info
->fs_mutex
);
119 make_bad_inode(inode
);
122 static int btrfs_unlink_trans(struct btrfs_trans_handle
*trans
,
123 struct btrfs_root
*root
,
125 struct dentry
*dentry
)
127 struct btrfs_path
*path
;
128 const char *name
= dentry
->d_name
.name
;
129 int name_len
= dentry
->d_name
.len
;
132 struct btrfs_dir_item
*di
;
134 path
= btrfs_alloc_path();
136 btrfs_init_path(path
);
137 ret
= btrfs_lookup_dir_item(trans
, root
, path
, dir
->i_ino
,
145 di
= btrfs_item_ptr(btrfs_buffer_leaf(path
->nodes
[0]), path
->slots
[0],
146 struct btrfs_dir_item
);
147 objectid
= btrfs_disk_key_objectid(&di
->location
);
149 ret
= btrfs_del_item(trans
, root
, path
);
152 btrfs_release_path(root
, path
);
153 ret
= btrfs_lookup_dir_index_item(trans
, root
, path
, dir
->i_ino
,
156 ret
= btrfs_del_item(trans
, root
, path
);
158 dentry
->d_inode
->i_ctime
= dir
->i_ctime
;
160 btrfs_release_path(root
, path
);
161 btrfs_free_path(path
);
163 inode_dec_link_count(dentry
->d_inode
);
164 dir
->i_size
-= name_len
* 2;
165 mark_inode_dirty(dir
);
170 static int btrfs_unlink(struct inode
*dir
, struct dentry
*dentry
)
172 struct btrfs_root
*root
;
173 struct btrfs_trans_handle
*trans
;
176 root
= BTRFS_I(dir
)->root
;
177 mutex_lock(&root
->fs_info
->fs_mutex
);
178 trans
= btrfs_start_transaction(root
, 1);
179 ret
= btrfs_unlink_trans(trans
, root
, dir
, dentry
);
180 btrfs_end_transaction(trans
, root
);
181 mutex_unlock(&root
->fs_info
->fs_mutex
);
185 static int btrfs_rmdir(struct inode
*dir
, struct dentry
*dentry
)
187 struct inode
*inode
= dentry
->d_inode
;
190 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
191 struct btrfs_path
*path
;
192 struct btrfs_key key
;
193 struct btrfs_trans_handle
*trans
;
194 struct btrfs_key found_key
;
196 struct btrfs_leaf
*leaf
;
197 char *goodnames
= "..";
199 path
= btrfs_alloc_path();
201 btrfs_init_path(path
);
202 mutex_lock(&root
->fs_info
->fs_mutex
);
203 trans
= btrfs_start_transaction(root
, 1);
204 key
.objectid
= inode
->i_ino
;
205 key
.offset
= (u64
)-1;
208 ret
= btrfs_search_slot(trans
, root
, &key
, path
, -1, 1);
214 if (path
->slots
[0] == 0) {
219 leaf
= btrfs_buffer_leaf(path
->nodes
[0]);
220 btrfs_disk_key_to_cpu(&found_key
,
221 &leaf
->items
[path
->slots
[0]].key
);
222 found_type
= btrfs_key_type(&found_key
);
223 if (found_key
.objectid
!= inode
->i_ino
) {
227 if ((found_type
!= BTRFS_DIR_ITEM_KEY
&&
228 found_type
!= BTRFS_DIR_INDEX_KEY
) ||
229 (!btrfs_match_dir_item_name(root
, path
, goodnames
, 2) &&
230 !btrfs_match_dir_item_name(root
, path
, goodnames
, 1))) {
234 ret
= btrfs_del_item(trans
, root
, path
);
237 if (found_type
== BTRFS_DIR_ITEM_KEY
&& found_key
.offset
== 1)
239 btrfs_release_path(root
, path
);
242 btrfs_release_path(root
, path
);
244 /* now the directory is empty */
245 err
= btrfs_unlink_trans(trans
, root
, dir
, dentry
);
250 btrfs_release_path(root
, path
);
251 btrfs_free_path(path
);
252 mutex_unlock(&root
->fs_info
->fs_mutex
);
253 ret
= btrfs_end_transaction(trans
, root
);
259 static int btrfs_free_inode(struct btrfs_trans_handle
*trans
,
260 struct btrfs_root
*root
,
263 struct btrfs_path
*path
;
268 path
= btrfs_alloc_path();
270 btrfs_init_path(path
);
271 ret
= btrfs_lookup_inode(trans
, root
, path
,
272 &BTRFS_I(inode
)->location
, -1);
274 ret
= btrfs_del_item(trans
, root
, path
);
276 btrfs_free_path(path
);
280 static int btrfs_truncate_in_trans(struct btrfs_trans_handle
*trans
,
281 struct btrfs_root
*root
,
285 struct btrfs_path
*path
;
286 struct btrfs_key key
;
287 struct btrfs_disk_key
*found_key
;
288 struct btrfs_leaf
*leaf
;
289 struct btrfs_file_extent_item
*fi
= NULL
;
290 u64 extent_start
= 0;
291 u64 extent_num_blocks
= 0;
294 path
= btrfs_alloc_path();
296 /* FIXME, add redo link to tree so we don't leak on crash */
297 key
.objectid
= inode
->i_ino
;
298 key
.offset
= (u64
)-1;
301 * use BTRFS_CSUM_ITEM_KEY because it is larger than inline keys
304 btrfs_set_key_type(&key
, BTRFS_CSUM_ITEM_KEY
);
306 btrfs_init_path(path
);
307 ret
= btrfs_search_slot(trans
, root
, &key
, path
, -1, 1);
312 BUG_ON(path
->slots
[0] == 0);
315 leaf
= btrfs_buffer_leaf(path
->nodes
[0]);
316 found_key
= &leaf
->items
[path
->slots
[0]].key
;
317 if (btrfs_disk_key_objectid(found_key
) != inode
->i_ino
)
319 if (btrfs_disk_key_type(found_key
) != BTRFS_CSUM_ITEM_KEY
&&
320 btrfs_disk_key_type(found_key
) != BTRFS_INLINE_DATA_KEY
&&
321 btrfs_disk_key_type(found_key
) != BTRFS_EXTENT_DATA_KEY
)
323 if (btrfs_disk_key_offset(found_key
) < inode
->i_size
)
325 if (btrfs_disk_key_type(found_key
) == BTRFS_EXTENT_DATA_KEY
) {
326 fi
= btrfs_item_ptr(btrfs_buffer_leaf(path
->nodes
[0]),
328 struct btrfs_file_extent_item
);
329 extent_start
= btrfs_file_extent_disk_blocknr(fi
);
331 btrfs_file_extent_disk_num_blocks(fi
);
333 btrfs_file_extent_num_blocks(fi
) >> 9;
338 ret
= btrfs_del_item(trans
, root
, path
);
340 btrfs_release_path(root
, path
);
342 ret
= btrfs_free_extent(trans
, root
, extent_start
,
343 extent_num_blocks
, 0);
349 btrfs_release_path(root
, path
);
350 btrfs_free_path(path
);
354 static void btrfs_delete_inode(struct inode
*inode
)
356 struct btrfs_trans_handle
*trans
;
357 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
360 truncate_inode_pages(&inode
->i_data
, 0);
361 if (is_bad_inode(inode
)) {
365 mutex_lock(&root
->fs_info
->fs_mutex
);
366 trans
= btrfs_start_transaction(root
, 1);
367 if (S_ISREG(inode
->i_mode
)) {
368 ret
= btrfs_truncate_in_trans(trans
, root
, inode
);
371 btrfs_free_inode(trans
, root
, inode
);
372 btrfs_end_transaction(trans
, root
);
373 mutex_unlock(&root
->fs_info
->fs_mutex
);
379 static int btrfs_inode_by_name(struct inode
*dir
, struct dentry
*dentry
,
380 struct btrfs_key
*location
)
382 const char *name
= dentry
->d_name
.name
;
383 int namelen
= dentry
->d_name
.len
;
384 struct btrfs_dir_item
*di
;
385 struct btrfs_path
*path
;
386 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
389 path
= btrfs_alloc_path();
391 btrfs_init_path(path
);
392 ret
= btrfs_lookup_dir_item(NULL
, root
, path
, dir
->i_ino
, name
,
394 if (ret
|| !btrfs_match_dir_item_name(root
, path
, name
, namelen
)) {
395 location
->objectid
= 0;
399 di
= btrfs_item_ptr(btrfs_buffer_leaf(path
->nodes
[0]), path
->slots
[0],
400 struct btrfs_dir_item
);
401 btrfs_disk_key_to_cpu(location
, &di
->location
);
403 btrfs_release_path(root
, path
);
404 btrfs_free_path(path
);
408 int fixup_tree_root_location(struct btrfs_root
*root
,
409 struct btrfs_key
*location
,
410 struct btrfs_root
**sub_root
)
412 struct btrfs_path
*path
;
413 struct btrfs_root_item
*ri
;
415 if (btrfs_key_type(location
) != BTRFS_ROOT_ITEM_KEY
)
417 if (location
->objectid
== BTRFS_ROOT_TREE_OBJECTID
)
420 path
= btrfs_alloc_path();
422 mutex_lock(&root
->fs_info
->fs_mutex
);
424 *sub_root
= btrfs_read_fs_root(root
->fs_info
, location
);
425 if (IS_ERR(*sub_root
))
426 return PTR_ERR(*sub_root
);
428 ri
= &(*sub_root
)->root_item
;
429 location
->objectid
= btrfs_root_dirid(ri
);
431 btrfs_set_key_type(location
, BTRFS_INODE_ITEM_KEY
);
432 location
->offset
= 0;
434 btrfs_free_path(path
);
435 mutex_unlock(&root
->fs_info
->fs_mutex
);
439 int btrfs_init_locked_inode(struct inode
*inode
, void *p
)
441 struct btrfs_iget_args
*args
= p
;
442 inode
->i_ino
= args
->ino
;
443 BTRFS_I(inode
)->root
= args
->root
;
447 int btrfs_find_actor(struct inode
*inode
, void *opaque
)
449 struct btrfs_iget_args
*args
= opaque
;
450 return (args
->ino
== inode
->i_ino
&&
451 args
->root
== BTRFS_I(inode
)->root
);
454 struct inode
*btrfs_iget_locked(struct super_block
*s
, u64 objectid
,
455 struct btrfs_root
*root
)
458 struct btrfs_iget_args args
;
462 inode
= iget5_locked(s
, objectid
, btrfs_find_actor
,
463 btrfs_init_locked_inode
,
468 static struct dentry
*btrfs_lookup(struct inode
*dir
, struct dentry
*dentry
,
469 struct nameidata
*nd
)
471 struct inode
* inode
;
472 struct btrfs_inode
*bi
= BTRFS_I(dir
);
473 struct btrfs_root
*root
= bi
->root
;
474 struct btrfs_root
*sub_root
= root
;
475 struct btrfs_key location
;
478 if (dentry
->d_name
.len
> BTRFS_NAME_LEN
)
479 return ERR_PTR(-ENAMETOOLONG
);
480 mutex_lock(&root
->fs_info
->fs_mutex
);
481 ret
= btrfs_inode_by_name(dir
, dentry
, &location
);
482 mutex_unlock(&root
->fs_info
->fs_mutex
);
486 if (location
.objectid
) {
487 ret
= fixup_tree_root_location(root
, &location
, &sub_root
);
491 return ERR_PTR(-ENOENT
);
492 inode
= btrfs_iget_locked(dir
->i_sb
, location
.objectid
,
495 return ERR_PTR(-EACCES
);
496 if (inode
->i_state
& I_NEW
) {
497 if (sub_root
!= root
) {
498 ret
= radix_tree_insert(
499 &root
->fs_info
->fs_roots_radix
,
500 (unsigned long)sub_root
,
502 printk("adding new root for inode %lu root %p (found %p)\n", inode
->i_ino
, sub_root
, BTRFS_I(inode
)->root
);
504 sub_root
->inode
= inode
;
506 BTRFS_I(inode
)->root
= sub_root
;
507 memcpy(&BTRFS_I(inode
)->location
, &location
,
509 btrfs_read_locked_inode(inode
);
510 unlock_new_inode(inode
);
513 return d_splice_alias(inode
, dentry
);
516 static int btrfs_readdir(struct file
*filp
, void *dirent
, filldir_t filldir
)
518 struct inode
*inode
= filp
->f_path
.dentry
->d_inode
;
519 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
520 struct btrfs_item
*item
;
521 struct btrfs_dir_item
*di
;
522 struct btrfs_key key
;
523 struct btrfs_path
*path
;
526 struct btrfs_leaf
*leaf
;
529 unsigned char d_type
= DT_UNKNOWN
;
531 int key_type
= BTRFS_DIR_INDEX_KEY
;
533 /* FIXME, use a real flag for deciding about the key type */
534 if (root
->fs_info
->tree_root
== root
)
535 key_type
= BTRFS_DIR_ITEM_KEY
;
536 mutex_lock(&root
->fs_info
->fs_mutex
);
537 key
.objectid
= inode
->i_ino
;
539 btrfs_set_key_type(&key
, key_type
);
540 key
.offset
= filp
->f_pos
;
541 path
= btrfs_alloc_path();
542 btrfs_init_path(path
);
543 ret
= btrfs_search_slot(NULL
, root
, &key
, path
, 0, 0);
548 leaf
= btrfs_buffer_leaf(path
->nodes
[0]);
549 nritems
= btrfs_header_nritems(&leaf
->header
);
550 slot
= path
->slots
[0];
551 if (advance
|| slot
>= nritems
) {
552 if (slot
>= nritems
-1) {
553 ret
= btrfs_next_leaf(root
, path
);
556 leaf
= btrfs_buffer_leaf(path
->nodes
[0]);
557 nritems
= btrfs_header_nritems(&leaf
->header
);
558 slot
= path
->slots
[0];
565 item
= leaf
->items
+ slot
;
566 if (btrfs_disk_key_objectid(&item
->key
) != key
.objectid
)
568 if (key_type
== BTRFS_DIR_INDEX_KEY
&&
569 btrfs_disk_key_offset(&item
->key
) > root
->highest_inode
)
571 if (btrfs_disk_key_type(&item
->key
) != key_type
)
573 if (btrfs_disk_key_offset(&item
->key
) < filp
->f_pos
)
575 filp
->f_pos
= btrfs_disk_key_offset(&item
->key
);
577 di
= btrfs_item_ptr(leaf
, slot
, struct btrfs_dir_item
);
578 over
= filldir(dirent
, (const char *)(di
+ 1),
579 btrfs_dir_name_len(di
),
580 btrfs_disk_key_offset(&item
->key
),
581 btrfs_disk_key_objectid(&di
->location
), d_type
);
589 btrfs_release_path(root
, path
);
590 btrfs_free_path(path
);
591 mutex_unlock(&root
->fs_info
->fs_mutex
);
595 static void btrfs_put_super (struct super_block
* sb
)
597 struct btrfs_root
*root
= btrfs_sb(sb
);
600 ret
= close_ctree(root
);
602 printk("close ctree returns %d\n", ret
);
604 sb
->s_fs_info
= NULL
;
607 static int btrfs_fill_super(struct super_block
* sb
, void * data
, int silent
)
609 struct inode
* inode
;
610 struct dentry
* root_dentry
;
611 struct btrfs_super_block
*disk_super
;
612 struct btrfs_root
*tree_root
;
613 struct btrfs_inode
*bi
;
615 sb
->s_maxbytes
= MAX_LFS_FILESIZE
;
616 sb
->s_magic
= BTRFS_SUPER_MAGIC
;
617 sb
->s_op
= &btrfs_super_ops
;
620 tree_root
= open_ctree(sb
);
623 printk("btrfs: open_ctree failed\n");
626 sb
->s_fs_info
= tree_root
;
627 disk_super
= tree_root
->fs_info
->disk_super
;
628 printk("read in super total blocks %Lu root %Lu\n",
629 btrfs_super_total_blocks(disk_super
),
630 btrfs_super_root_dir(disk_super
));
632 inode
= btrfs_iget_locked(sb
, btrfs_super_root_dir(disk_super
),
635 bi
->location
.objectid
= inode
->i_ino
;
636 bi
->location
.offset
= 0;
637 bi
->location
.flags
= 0;
638 bi
->root
= tree_root
;
639 btrfs_set_key_type(&bi
->location
, BTRFS_INODE_ITEM_KEY
);
643 if (inode
->i_state
& I_NEW
) {
644 btrfs_read_locked_inode(inode
);
645 unlock_new_inode(inode
);
648 root_dentry
= d_alloc_root(inode
);
653 sb
->s_root
= root_dentry
;
658 static void fill_inode_item(struct btrfs_inode_item
*item
,
661 btrfs_set_inode_uid(item
, inode
->i_uid
);
662 btrfs_set_inode_gid(item
, inode
->i_gid
);
663 btrfs_set_inode_size(item
, inode
->i_size
);
664 btrfs_set_inode_mode(item
, inode
->i_mode
);
665 btrfs_set_inode_nlink(item
, inode
->i_nlink
);
666 btrfs_set_timespec_sec(&item
->atime
, inode
->i_atime
.tv_sec
);
667 btrfs_set_timespec_nsec(&item
->atime
, inode
->i_atime
.tv_nsec
);
668 btrfs_set_timespec_sec(&item
->mtime
, inode
->i_mtime
.tv_sec
);
669 btrfs_set_timespec_nsec(&item
->mtime
, inode
->i_mtime
.tv_nsec
);
670 btrfs_set_timespec_sec(&item
->ctime
, inode
->i_ctime
.tv_sec
);
671 btrfs_set_timespec_nsec(&item
->ctime
, inode
->i_ctime
.tv_nsec
);
672 btrfs_set_inode_nblocks(item
, inode
->i_blocks
);
673 btrfs_set_inode_generation(item
, inode
->i_generation
);
676 static int btrfs_update_inode(struct btrfs_trans_handle
*trans
,
677 struct btrfs_root
*root
,
680 struct btrfs_inode_item
*inode_item
;
681 struct btrfs_path
*path
;
684 path
= btrfs_alloc_path();
686 btrfs_init_path(path
);
687 ret
= btrfs_lookup_inode(trans
, root
, path
,
688 &BTRFS_I(inode
)->location
, 1);
695 inode_item
= btrfs_item_ptr(btrfs_buffer_leaf(path
->nodes
[0]),
697 struct btrfs_inode_item
);
699 fill_inode_item(inode_item
, inode
);
700 btrfs_mark_buffer_dirty(path
->nodes
[0]);
703 btrfs_release_path(root
, path
);
704 btrfs_free_path(path
);
708 static int btrfs_write_inode(struct inode
*inode
, int wait
)
710 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
711 struct btrfs_trans_handle
*trans
;
714 mutex_lock(&root
->fs_info
->fs_mutex
);
715 trans
= btrfs_start_transaction(root
, 1);
716 ret
= btrfs_update_inode(trans
, root
, inode
);
718 btrfs_commit_transaction(trans
, root
);
720 btrfs_end_transaction(trans
, root
);
721 mutex_unlock(&root
->fs_info
->fs_mutex
);
725 static struct inode
*btrfs_new_inode(struct btrfs_trans_handle
*trans
,
726 struct inode
*dir
, int mode
)
729 struct btrfs_inode_item inode_item
;
730 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
731 struct btrfs_key
*location
;
735 inode
= new_inode(dir
->i_sb
);
737 return ERR_PTR(-ENOMEM
);
739 BTRFS_I(inode
)->root
= BTRFS_I(dir
)->root
;
740 ret
= btrfs_find_free_objectid(trans
, root
, dir
->i_ino
, &objectid
);
743 inode
->i_uid
= current
->fsuid
;
744 inode
->i_gid
= current
->fsgid
;
745 inode
->i_mode
= mode
;
746 inode
->i_ino
= objectid
;
748 inode
->i_mtime
= inode
->i_atime
= inode
->i_ctime
= CURRENT_TIME
;
749 fill_inode_item(&inode_item
, inode
);
750 location
= &BTRFS_I(inode
)->location
;
751 location
->objectid
= objectid
;
753 location
->offset
= 0;
754 btrfs_set_key_type(location
, BTRFS_INODE_ITEM_KEY
);
756 ret
= btrfs_insert_inode(trans
, root
, objectid
, &inode_item
);
759 insert_inode_hash(inode
);
763 static int btrfs_add_link(struct btrfs_trans_handle
*trans
,
764 struct dentry
*dentry
, struct inode
*inode
)
767 struct btrfs_key key
;
768 struct btrfs_root
*root
= BTRFS_I(dentry
->d_parent
->d_inode
)->root
;
769 key
.objectid
= inode
->i_ino
;
771 btrfs_set_key_type(&key
, BTRFS_INODE_ITEM_KEY
);
774 ret
= btrfs_insert_dir_item(trans
, root
,
775 dentry
->d_name
.name
, dentry
->d_name
.len
,
776 dentry
->d_parent
->d_inode
->i_ino
,
779 dentry
->d_parent
->d_inode
->i_size
+= dentry
->d_name
.len
* 2;
780 ret
= btrfs_update_inode(trans
, root
,
781 dentry
->d_parent
->d_inode
);
786 static int btrfs_add_nondir(struct btrfs_trans_handle
*trans
,
787 struct dentry
*dentry
, struct inode
*inode
)
789 int err
= btrfs_add_link(trans
, dentry
, inode
);
791 d_instantiate(dentry
, inode
);
799 static int btrfs_create(struct inode
*dir
, struct dentry
*dentry
,
800 int mode
, struct nameidata
*nd
)
802 struct btrfs_trans_handle
*trans
;
803 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
808 mutex_lock(&root
->fs_info
->fs_mutex
);
809 trans
= btrfs_start_transaction(root
, 1);
810 inode
= btrfs_new_inode(trans
, dir
, mode
);
811 err
= PTR_ERR(inode
);
814 // FIXME mark the inode dirty
815 err
= btrfs_add_nondir(trans
, dentry
, inode
);
819 inode
->i_mapping
->a_ops
= &btrfs_aops
;
820 inode
->i_fop
= &btrfs_file_operations
;
821 inode
->i_op
= &btrfs_file_inode_operations
;
823 dir
->i_sb
->s_dirt
= 1;
825 btrfs_end_transaction(trans
, root
);
826 mutex_unlock(&root
->fs_info
->fs_mutex
);
829 inode_dec_link_count(inode
);
835 static int btrfs_make_empty_dir(struct btrfs_trans_handle
*trans
,
836 struct inode
*inode
, struct inode
*dir
)
838 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
841 struct btrfs_key key
;
846 key
.objectid
= inode
->i_ino
;
849 btrfs_set_key_type(&key
, BTRFS_INODE_ITEM_KEY
);
851 ret
= btrfs_insert_dir_item(trans
, root
, buf
, 1, inode
->i_ino
,
855 key
.objectid
= dir
->i_ino
;
856 ret
= btrfs_insert_dir_item(trans
, root
, buf
, 2, inode
->i_ino
,
861 ret
= btrfs_update_inode(trans
, root
, inode
);
866 static int btrfs_mkdir(struct inode
*dir
, struct dentry
*dentry
, int mode
)
869 struct btrfs_trans_handle
*trans
;
870 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
874 mutex_lock(&root
->fs_info
->fs_mutex
);
875 trans
= btrfs_start_transaction(root
, 1);
877 err
= PTR_ERR(trans
);
880 inode
= btrfs_new_inode(trans
, dir
, S_IFDIR
| mode
);
882 err
= PTR_ERR(inode
);
886 inode
->i_op
= &btrfs_dir_inode_operations
;
887 inode
->i_fop
= &btrfs_dir_file_operations
;
889 err
= btrfs_make_empty_dir(trans
, inode
, dir
);
892 err
= btrfs_add_link(trans
, dentry
, inode
);
895 d_instantiate(dentry
, inode
);
899 btrfs_end_transaction(trans
, root
);
901 mutex_unlock(&root
->fs_info
->fs_mutex
);
907 static int btrfs_sync_fs(struct super_block
*sb
, int wait
)
909 struct btrfs_trans_handle
*trans
;
910 struct btrfs_root
*root
;
916 filemap_flush(root
->fs_info
->btree_inode
->i_mapping
);
919 filemap_write_and_wait(root
->fs_info
->btree_inode
->i_mapping
);
920 mutex_lock(&root
->fs_info
->fs_mutex
);
921 trans
= btrfs_start_transaction(root
, 1);
922 ret
= btrfs_commit_transaction(trans
, root
);
925 printk("btrfs sync_fs\n");
926 mutex_unlock(&root
->fs_info
->fs_mutex
);
931 static int btrfs_get_block_inline(struct inode
*inode
, sector_t iblock
,
932 struct buffer_head
*result
, int create
)
934 struct btrfs_root
*root
= btrfs_sb(inode
->i_sb
);
935 struct btrfs_path
*path
;
936 struct btrfs_key key
;
937 struct btrfs_leaf
*leaf
;
938 int num_bytes
= result
->b_size
;
948 path
= btrfs_alloc_path();
955 pos
= iblock
<< inode
->i_blkbits
;
956 key
.objectid
= inode
->i_ino
;
958 btrfs_set_key_type(&key
, BTRFS_INLINE_DATA_KEY
);
959 ptr
= kmap(result
->b_page
);
961 ptr
+= (pos
& (PAGE_CACHE_SIZE
-1));
964 ret
= btrfs_search_slot(NULL
, root
, &key
, path
, 0, 0);
972 leaf
= btrfs_buffer_leaf(path
->nodes
[0]);
973 item_size
= btrfs_item_size(leaf
->items
+ path
->slots
[0]);
974 copy_size
= min(num_bytes
, item_size
);
975 data_ptr
= btrfs_item_ptr(leaf
, path
->slots
[0], char);
976 WARN_ON(safe_ptr
+ PAGE_CACHE_SIZE
< ptr
+ copy_size
);
977 memcpy(ptr
, data_ptr
, copy_size
);
979 num_bytes
-= copy_size
;
980 WARN_ON(num_bytes
< 0);
982 btrfs_release_path(root
, path
);
983 if (num_bytes
!= 0) {
984 if (pos
>= i_size_read(inode
))
985 memset(ptr
, 0, num_bytes
);
989 set_buffer_uptodate(result
);
990 map_bh(result
, inode
->i_sb
, 0);
993 btrfs_free_path(path
);
994 kunmap(result
->b_page
);
999 static int btrfs_get_block_lock(struct inode
*inode
, sector_t iblock
,
1000 struct buffer_head
*result
, int create
)
1005 u64 extent_start
= 0;
1007 u64 objectid
= inode
->i_ino
;
1008 struct btrfs_path
*path
;
1009 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1010 struct btrfs_trans_handle
*trans
= NULL
;
1011 struct btrfs_file_extent_item
*item
;
1012 struct btrfs_leaf
*leaf
;
1013 struct btrfs_disk_key
*found_key
;
1015 path
= btrfs_alloc_path();
1017 btrfs_init_path(path
);
1019 trans
= btrfs_start_transaction(root
, 1);
1021 ret
= btrfs_lookup_file_extent(trans
, root
, path
,
1023 iblock
<< inode
->i_blkbits
, create
);
1030 if (path
->slots
[0] == 0) {
1031 btrfs_release_path(root
, path
);
1037 item
= btrfs_item_ptr(btrfs_buffer_leaf(path
->nodes
[0]), path
->slots
[0],
1038 struct btrfs_file_extent_item
);
1039 leaf
= btrfs_buffer_leaf(path
->nodes
[0]);
1040 blocknr
= btrfs_file_extent_disk_blocknr(item
);
1041 blocknr
+= btrfs_file_extent_offset(item
);
1043 /* exact match found, use it, FIXME, deal with extents
1044 * other than the page size
1048 BUG_ON(btrfs_file_extent_disk_num_blocks(item
) != 1);
1050 btrfs_file_extent_generation(item
) != trans
->transid
) {
1051 struct btrfs_key ins
;
1052 ret
= btrfs_alloc_extent(trans
, root
, 1,
1053 blocknr
, (u64
)-1, &ins
);
1055 btrfs_set_file_extent_disk_blocknr(item
, ins
.objectid
);
1056 mark_buffer_dirty(path
->nodes
[0]);
1057 ret
= btrfs_free_extent(trans
, root
,
1060 blocknr
= ins
.objectid
;
1063 map_bh(result
, inode
->i_sb
, blocknr
);
1067 /* are we inside the extent that was found? */
1068 found_key
= &leaf
->items
[path
->slots
[0]].key
;
1069 if (btrfs_disk_key_objectid(found_key
) != objectid
||
1070 btrfs_disk_key_type(found_key
) != BTRFS_EXTENT_DATA_KEY
) {
1073 btrfs_release_path(root
, path
);
1077 extent_start
= btrfs_disk_key_offset(&leaf
->items
[path
->slots
[0]].key
);
1078 extent_start
= extent_start
>> inode
->i_blkbits
;
1079 extent_start
+= btrfs_file_extent_offset(item
);
1080 extent_end
= extent_start
+ btrfs_file_extent_num_blocks(item
);
1081 if (iblock
>= extent_start
&& iblock
< extent_end
) {
1083 map_bh(result
, inode
->i_sb
, blocknr
+ iblock
- extent_start
);
1087 /* ok, create a new extent */
1092 ret
= btrfs_alloc_file_extent(trans
, root
, objectid
,
1093 iblock
<< inode
->i_blkbits
,
1094 1, extent_end
, &blocknr
);
1099 inode
->i_blocks
+= inode
->i_sb
->s_blocksize
>> 9;
1100 set_buffer_new(result
);
1101 map_bh(result
, inode
->i_sb
, blocknr
);
1104 btrfs_release_path(root
, path
);
1105 btrfs_free_path(path
);
1107 btrfs_end_transaction(trans
, root
);
1111 static int btrfs_get_block(struct inode
*inode
, sector_t iblock
,
1112 struct buffer_head
*result
, int create
)
1115 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1116 mutex_lock(&root
->fs_info
->fs_mutex
);
1117 err
= btrfs_get_block_lock(inode
, iblock
, result
, create
);
1118 // err = btrfs_get_block_inline(inode, iblock, result, create);
1119 mutex_unlock(&root
->fs_info
->fs_mutex
);
1123 static int btrfs_prepare_write(struct file
*file
, struct page
*page
,
1124 unsigned from
, unsigned to
)
1126 return nobh_prepare_write(page
, from
, to
, btrfs_get_block
);
1128 static int btrfs_commit_write(struct file
*file
, struct page
*page
,
1129 unsigned from
, unsigned to
)
1131 return nobh_commit_write(file
, page
, from
, to
);
1134 static void btrfs_write_super(struct super_block
*sb
)
1136 btrfs_sync_fs(sb
, 1);
1139 static int btrfs_readpage(struct file
*file
, struct page
*page
)
1141 return mpage_readpage(page
, btrfs_get_block
);
1144 static int btrfs_readpages(struct file
*file
, struct address_space
*mapping
,
1145 struct list_head
*pages
, unsigned nr_pages
)
1147 return mpage_readpages(mapping
, pages
, nr_pages
, btrfs_get_block
);
1150 static int btrfs_writepage(struct page
*page
, struct writeback_control
*wbc
)
1152 return nobh_writepage(page
, btrfs_get_block
, wbc
);
1155 static void btrfs_truncate(struct inode
*inode
)
1157 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1159 struct btrfs_trans_handle
*trans
;
1161 if (!S_ISREG(inode
->i_mode
))
1163 if (IS_APPEND(inode
) || IS_IMMUTABLE(inode
))
1166 nobh_truncate_page(inode
->i_mapping
, inode
->i_size
);
1168 /* FIXME, add redo link to tree so we don't leak on crash */
1169 mutex_lock(&root
->fs_info
->fs_mutex
);
1170 trans
= btrfs_start_transaction(root
, 1);
1171 ret
= btrfs_truncate_in_trans(trans
, root
, inode
);
1173 ret
= btrfs_end_transaction(trans
, root
);
1175 mutex_unlock(&root
->fs_info
->fs_mutex
);
1176 mark_inode_dirty(inode
);
1179 static int btrfs_copy_from_user(loff_t pos
, int num_pages
, int write_bytes
,
1180 struct page
**prepared_pages
,
1181 const char __user
* buf
)
1183 long page_fault
= 0;
1185 int offset
= pos
& (PAGE_CACHE_SIZE
- 1);
1187 for (i
= 0; i
< num_pages
&& write_bytes
> 0; i
++, offset
= 0) {
1188 size_t count
= min_t(size_t,
1189 PAGE_CACHE_SIZE
- offset
, write_bytes
);
1190 struct page
*page
= prepared_pages
[i
];
1191 fault_in_pages_readable(buf
, count
);
1193 /* Copy data from userspace to the current page */
1195 page_fault
= __copy_from_user(page_address(page
) + offset
,
1197 /* Flush processor's dcache for this page */
1198 flush_dcache_page(page
);
1201 write_bytes
-= count
;
1206 return page_fault
? -EFAULT
: 0;
1209 static void btrfs_drop_pages(struct page
**pages
, size_t num_pages
)
1212 for (i
= 0; i
< num_pages
; i
++) {
1215 unlock_page(pages
[i
]);
1216 mark_page_accessed(pages
[i
]);
1217 page_cache_release(pages
[i
]);
1220 static int dirty_and_release_pages(struct btrfs_trans_handle
*trans
,
1221 struct btrfs_root
*root
,
1223 struct page
**pages
,
1233 struct inode
*inode
= file
->f_path
.dentry
->d_inode
;
1235 for (i
= 0; i
< num_pages
; i
++) {
1236 offset
= pos
& (PAGE_CACHE_SIZE
-1);
1237 this_write
= min(PAGE_CACHE_SIZE
- offset
, write_bytes
);
1238 /* FIXME, one block at a time */
1240 mutex_lock(&root
->fs_info
->fs_mutex
);
1241 trans
= btrfs_start_transaction(root
, 1);
1242 btrfs_csum_file_block(trans
, root
, inode
->i_ino
,
1243 pages
[i
]->index
<< PAGE_CACHE_SHIFT
,
1244 kmap(pages
[i
]), PAGE_CACHE_SIZE
);
1246 SetPageChecked(pages
[i
]);
1247 ret
= btrfs_end_transaction(trans
, root
);
1249 mutex_unlock(&root
->fs_info
->fs_mutex
);
1251 ret
= nobh_commit_write(file
, pages
[i
], offset
,
1252 offset
+ this_write
);
1258 WARN_ON(this_write
> write_bytes
);
1259 write_bytes
-= this_write
;
1265 static int prepare_pages(struct btrfs_trans_handle
*trans
,
1266 struct btrfs_root
*root
,
1268 struct page
**pages
,
1271 unsigned long first_index
,
1272 unsigned long last_index
,
1276 unsigned long index
= pos
>> PAGE_CACHE_SHIFT
;
1277 struct inode
*inode
= file
->f_path
.dentry
->d_inode
;
1282 loff_t isize
= i_size_read(inode
);
1284 memset(pages
, 0, num_pages
* sizeof(struct page
*));
1286 for (i
= 0; i
< num_pages
; i
++) {
1287 pages
[i
] = grab_cache_page(inode
->i_mapping
, index
+ i
);
1290 goto failed_release
;
1292 offset
= pos
& (PAGE_CACHE_SIZE
-1);
1293 this_write
= min(PAGE_CACHE_SIZE
- offset
, write_bytes
);
1294 if (!PageUptodate(pages
[i
]) &&
1295 (pages
[i
]->index
== first_index
||
1296 pages
[i
]->index
== last_index
) && pos
< isize
) {
1297 ret
= mpage_readpage(pages
[i
], btrfs_get_block
);
1299 lock_page(pages
[i
]);
1301 ret
= nobh_prepare_write(pages
[i
], offset
,
1302 offset
+ this_write
,
1307 goto failed_truncate
;
1309 WARN_ON(this_write
> write_bytes
);
1310 write_bytes
-= this_write
;
1315 btrfs_drop_pages(pages
, num_pages
);
1319 btrfs_drop_pages(pages
, num_pages
);
1321 vmtruncate(inode
, isize
);
1325 static ssize_t
btrfs_file_write(struct file
*file
, const char __user
*buf
,
1326 size_t count
, loff_t
*ppos
)
1329 size_t num_written
= 0;
1332 struct inode
*inode
= file
->f_path
.dentry
->d_inode
;
1333 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1334 struct page
*pages
[1];
1335 unsigned long first_index
;
1336 unsigned long last_index
;
1338 if (file
->f_flags
& O_DIRECT
)
1342 vfs_check_frozen(inode
->i_sb
, SB_FREEZE_WRITE
);
1343 current
->backing_dev_info
= inode
->i_mapping
->backing_dev_info
;
1344 err
= generic_write_checks(file
, &pos
, &count
, S_ISBLK(inode
->i_mode
));
1349 err
= remove_suid(file
->f_path
.dentry
);
1352 file_update_time(file
);
1353 mutex_lock(&inode
->i_mutex
);
1354 first_index
= pos
>> PAGE_CACHE_SHIFT
;
1355 last_index
= (pos
+ count
) >> PAGE_CACHE_SHIFT
;
1357 size_t offset
= pos
& (PAGE_CACHE_SIZE
- 1);
1358 size_t write_bytes
= min(count
, PAGE_CACHE_SIZE
- offset
);
1359 size_t num_pages
= (write_bytes
+ PAGE_CACHE_SIZE
- 1) >>
1361 ret
= prepare_pages(NULL
, root
, file
, pages
, num_pages
,
1362 pos
, first_index
, last_index
, write_bytes
);
1364 ret
= btrfs_copy_from_user(pos
, num_pages
,
1365 write_bytes
, pages
, buf
);
1368 ret
= dirty_and_release_pages(NULL
, root
, file
, pages
,
1369 num_pages
, pos
, write_bytes
);
1371 btrfs_drop_pages(pages
, num_pages
);
1374 count
-= write_bytes
;
1376 num_written
+= write_bytes
;
1378 balance_dirty_pages_ratelimited(inode
->i_mapping
);
1381 mutex_unlock(&inode
->i_mutex
);
1384 current
->backing_dev_info
= NULL
;
1385 return num_written
? num_written
: err
;
1389 static ssize_t
inline_one_page(struct btrfs_root
*root
, struct inode
*inode
,
1390 struct page
*page
, loff_t pos
,
1391 size_t offset
, size_t write_bytes
)
1393 struct btrfs_path
*path
;
1394 struct btrfs_trans_handle
*trans
;
1395 struct btrfs_key key
;
1396 struct btrfs_leaf
*leaf
;
1397 struct btrfs_key found_key
;
1399 size_t copy_size
= 0;
1402 size_t num_written
= 0;
1404 path
= btrfs_alloc_path();
1406 mutex_lock(&root
->fs_info
->fs_mutex
);
1407 trans
= btrfs_start_transaction(root
, 1);
1408 key
.objectid
= inode
->i_ino
;
1410 btrfs_set_key_type(&key
, BTRFS_INLINE_DATA_KEY
);
1414 ret
= btrfs_search_slot(trans
, root
, &key
, path
, 0, 1);
1420 leaf
= btrfs_buffer_leaf(path
->nodes
[0]);
1421 btrfs_disk_key_to_cpu(&found_key
,
1422 &leaf
->items
[path
->slots
[0]].key
);
1423 copy_size
= btrfs_item_size(leaf
->items
+ path
->slots
[0]);
1424 dst
= btrfs_item_ptr(leaf
, path
->slots
[0], char);
1425 copy_size
= min(write_bytes
, copy_size
);
1428 int slot
= path
->slots
[0];
1432 // FIXME find max key
1433 leaf
= btrfs_buffer_leaf(path
->nodes
[0]);
1434 btrfs_disk_key_to_cpu(&found_key
,
1435 &leaf
->items
[slot
].key
);
1436 if (found_key
.objectid
!= inode
->i_ino
)
1438 if (btrfs_key_type(&found_key
) != BTRFS_INLINE_DATA_KEY
)
1440 copy_size
= btrfs_item_size(leaf
->items
+ slot
);
1441 if (found_key
.offset
+ copy_size
<= pos
)
1443 dst
= btrfs_item_ptr(leaf
, path
->slots
[0], char);
1444 dst
+= pos
- found_key
.offset
;
1445 copy_size
= copy_size
- (pos
- found_key
.offset
);
1446 BUG_ON(copy_size
< 0);
1447 copy_size
= min(write_bytes
, copy_size
);
1448 WARN_ON(copy_size
== 0);
1452 btrfs_release_path(root
, path
);
1453 copy_size
= min(write_bytes
,
1454 (size_t)BTRFS_LEAF_DATA_SIZE(root
) -
1455 sizeof(struct btrfs_item
) * 4);
1456 ret
= btrfs_insert_empty_item(trans
, root
, path
, &key
, copy_size
);
1458 dst
= btrfs_item_ptr(btrfs_buffer_leaf(path
->nodes
[0]),
1459 path
->slots
[0], char);
1461 WARN_ON(copy_size
== 0);
1462 WARN_ON(dst
+ copy_size
>
1463 btrfs_item_ptr(btrfs_buffer_leaf(path
->nodes
[0]),
1464 path
->slots
[0], char) +
1465 btrfs_item_size(btrfs_buffer_leaf(path
->nodes
[0])->items
+
1467 btrfs_memcpy(root
, path
->nodes
[0]->b_data
, dst
,
1468 page_address(page
) + offset
, copy_size
);
1469 mark_buffer_dirty(path
->nodes
[0]);
1470 btrfs_release_path(root
, path
);
1472 offset
+= copy_size
;
1473 num_written
+= copy_size
;
1474 write_bytes
-= copy_size
;
1478 btrfs_free_path(path
);
1479 ret
= btrfs_end_transaction(trans
, root
);
1481 mutex_unlock(&root
->fs_info
->fs_mutex
);
1482 return num_written
? num_written
: err
;
1485 static ssize_t
btrfs_file_inline_write(struct file
*file
,
1486 const char __user
*buf
,
1487 size_t count
, loff_t
*ppos
)
1490 size_t num_written
= 0;
1493 struct inode
*inode
= file
->f_path
.dentry
->d_inode
;
1494 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1495 unsigned long page_index
;
1497 if (file
->f_flags
& O_DIRECT
)
1501 vfs_check_frozen(inode
->i_sb
, SB_FREEZE_WRITE
);
1502 current
->backing_dev_info
= inode
->i_mapping
->backing_dev_info
;
1503 err
= generic_write_checks(file
, &pos
, &count
, S_ISBLK(inode
->i_mode
));
1508 err
= remove_suid(file
->f_path
.dentry
);
1511 file_update_time(file
);
1512 mutex_lock(&inode
->i_mutex
);
1514 size_t offset
= pos
& (PAGE_CACHE_SIZE
- 1);
1515 size_t write_bytes
= min(count
, PAGE_CACHE_SIZE
- offset
);
1518 page_index
= pos
>> PAGE_CACHE_SHIFT
;
1519 page
= grab_cache_page(inode
->i_mapping
, page_index
);
1520 if (!PageUptodate(page
)) {
1521 ret
= mpage_readpage(page
, btrfs_get_block
);
1525 ret
= btrfs_copy_from_user(pos
, 1,
1526 write_bytes
, &page
, buf
);
1528 write_bytes
= inline_one_page(root
, inode
, page
, pos
,
1529 offset
, write_bytes
);
1530 SetPageUptodate(page
);
1531 if (write_bytes
> 0 && pos
+ write_bytes
> inode
->i_size
) {
1532 i_size_write(inode
, pos
+ write_bytes
);
1533 mark_inode_dirty(inode
);
1535 page_cache_release(page
);
1537 if (write_bytes
< 0)
1540 count
-= write_bytes
;
1542 num_written
+= write_bytes
;
1544 balance_dirty_pages_ratelimited(inode
->i_mapping
);
1548 mutex_unlock(&inode
->i_mutex
);
1551 current
->backing_dev_info
= NULL
;
1552 return num_written
? num_written
: err
;
1556 static int btrfs_read_actor(read_descriptor_t
*desc
, struct page
*page
,
1557 unsigned long offset
, unsigned long size
)
1560 unsigned long left
, count
= desc
->count
;
1561 struct inode
*inode
= page
->mapping
->host
;
1566 if (!PageChecked(page
)) {
1567 /* FIXME, do it per block */
1568 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1569 int ret
= btrfs_csum_verify_file_block(root
,
1570 page
->mapping
->host
->i_ino
,
1571 page
->index
<< PAGE_CACHE_SHIFT
,
1572 kmap(page
), PAGE_CACHE_SIZE
);
1574 printk("failed to verify ino %lu page %lu\n",
1575 page
->mapping
->host
->i_ino
,
1577 memset(page_address(page
), 0, PAGE_CACHE_SIZE
);
1579 SetPageChecked(page
);
1583 * Faults on the destination of a read are common, so do it before
1586 if (!fault_in_pages_writeable(desc
->arg
.buf
, size
)) {
1587 kaddr
= kmap_atomic(page
, KM_USER0
);
1588 left
= __copy_to_user_inatomic(desc
->arg
.buf
,
1589 kaddr
+ offset
, size
);
1590 kunmap_atomic(kaddr
, KM_USER0
);
1595 /* Do it the slow way */
1597 left
= __copy_to_user(desc
->arg
.buf
, kaddr
+ offset
, size
);
1602 desc
->error
= -EFAULT
;
1605 desc
->count
= count
- size
;
1606 desc
->written
+= size
;
1607 desc
->arg
.buf
+= size
;
1612 * btrfs_file_aio_read - filesystem read routine
1613 * @iocb: kernel I/O control block
1614 * @iov: io vector request
1615 * @nr_segs: number of segments in the iovec
1616 * @pos: current file position
1618 static ssize_t
btrfs_file_aio_read(struct kiocb
*iocb
, const struct iovec
*iov
,
1619 unsigned long nr_segs
, loff_t pos
)
1621 struct file
*filp
= iocb
->ki_filp
;
1625 loff_t
*ppos
= &iocb
->ki_pos
;
1628 for (seg
= 0; seg
< nr_segs
; seg
++) {
1629 const struct iovec
*iv
= &iov
[seg
];
1632 * If any segment has a negative length, or the cumulative
1633 * length ever wraps negative then return -EINVAL.
1635 count
+= iv
->iov_len
;
1636 if (unlikely((ssize_t
)(count
|iv
->iov_len
) < 0))
1638 if (access_ok(VERIFY_WRITE
, iv
->iov_base
, iv
->iov_len
))
1643 count
-= iv
->iov_len
; /* This segment is no good */
1648 for (seg
= 0; seg
< nr_segs
; seg
++) {
1649 read_descriptor_t desc
;
1652 desc
.arg
.buf
= iov
[seg
].iov_base
;
1653 desc
.count
= iov
[seg
].iov_len
;
1654 if (desc
.count
== 0)
1657 do_generic_file_read(filp
, ppos
, &desc
,
1659 retval
+= desc
.written
;
1661 retval
= retval
?: desc
.error
;
1669 static int create_snapshot(struct btrfs_root
*root
, char *name
, int namelen
)
1671 struct btrfs_trans_handle
*trans
;
1672 struct btrfs_key key
;
1673 struct btrfs_root_item new_root_item
;
1677 mutex_lock(&root
->fs_info
->fs_mutex
);
1678 trans
= btrfs_start_transaction(root
, 1);
1681 ret
= btrfs_update_inode(trans
, root
, root
->inode
);
1684 ret
= btrfs_find_free_objectid(trans
, root
->fs_info
->tree_root
,
1688 memset(&new_root_item
, 0, sizeof(new_root_item
));
1689 memcpy(&new_root_item
, &root
->root_item
,
1690 sizeof(new_root_item
));
1692 key
.objectid
= objectid
;
1695 btrfs_set_key_type(&key
, BTRFS_ROOT_ITEM_KEY
);
1696 btrfs_set_root_blocknr(&new_root_item
, root
->node
->b_blocknr
);
1698 ret
= btrfs_insert_root(trans
, root
->fs_info
->tree_root
, &key
,
1702 printk("adding snapshot name %.*s root %Lu %Lu %u\n", namelen
, name
, key
.objectid
, key
.offset
, key
.flags
);
1705 * insert the directory item
1707 key
.offset
= (u64
)-1;
1708 ret
= btrfs_insert_dir_item(trans
, root
->fs_info
->tree_root
,
1710 root
->fs_info
->sb
->s_root
->d_inode
->i_ino
,
1715 ret
= btrfs_inc_root_ref(trans
, root
);
1718 ret
= btrfs_commit_transaction(trans
, root
);
1720 mutex_unlock(&root
->fs_info
->fs_mutex
);
1724 static int btrfs_ioctl(struct inode
*inode
, struct file
*filp
, unsigned int
1725 cmd
, unsigned long arg
)
1727 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1728 struct btrfs_ioctl_vol_args vol_args
;
1732 if (!root
->ref_cows
)
1735 case BTRFS_IOC_SNAP_CREATE
:
1736 if (copy_from_user(&vol_args
,
1737 (struct btrfs_ioctl_vol_args __user
*)arg
,
1740 namelen
= strlen(vol_args
.name
);
1741 if (namelen
> BTRFS_VOL_NAME_MAX
)
1743 ret
= create_snapshot(root
, vol_args
.name
, namelen
);
1752 static struct kmem_cache
*btrfs_inode_cachep
;
1753 struct kmem_cache
*btrfs_trans_handle_cachep
;
1754 struct kmem_cache
*btrfs_transaction_cachep
;
1755 struct kmem_cache
*btrfs_bit_radix_cachep
;
1756 struct kmem_cache
*btrfs_path_cachep
;
1759 * Called inside transaction, so use GFP_NOFS
1761 static struct inode
*btrfs_alloc_inode(struct super_block
*sb
)
1763 struct btrfs_inode
*ei
;
1765 ei
= kmem_cache_alloc(btrfs_inode_cachep
, GFP_NOFS
);
1768 return &ei
->vfs_inode
;
1771 static void btrfs_destroy_inode(struct inode
*inode
)
1773 WARN_ON(!list_empty(&inode
->i_dentry
));
1774 WARN_ON(inode
->i_data
.nrpages
);
1776 kmem_cache_free(btrfs_inode_cachep
, BTRFS_I(inode
));
1779 static void init_once(void * foo
, struct kmem_cache
* cachep
,
1780 unsigned long flags
)
1782 struct btrfs_inode
*ei
= (struct btrfs_inode
*) foo
;
1784 if ((flags
& (SLAB_CTOR_VERIFY
|SLAB_CTOR_CONSTRUCTOR
)) ==
1785 SLAB_CTOR_CONSTRUCTOR
) {
1786 inode_init_once(&ei
->vfs_inode
);
1790 static int init_inodecache(void)
1792 btrfs_inode_cachep
= kmem_cache_create("btrfs_inode_cache",
1793 sizeof(struct btrfs_inode
),
1794 0, (SLAB_RECLAIM_ACCOUNT
|
1797 btrfs_trans_handle_cachep
= kmem_cache_create("btrfs_trans_handle_cache",
1798 sizeof(struct btrfs_trans_handle
),
1799 0, (SLAB_RECLAIM_ACCOUNT
|
1802 btrfs_transaction_cachep
= kmem_cache_create("btrfs_transaction_cache",
1803 sizeof(struct btrfs_transaction
),
1804 0, (SLAB_RECLAIM_ACCOUNT
|
1807 btrfs_path_cachep
= kmem_cache_create("btrfs_path_cache",
1808 sizeof(struct btrfs_transaction
),
1809 0, (SLAB_RECLAIM_ACCOUNT
|
1812 btrfs_bit_radix_cachep
= kmem_cache_create("btrfs_radix",
1814 0, (SLAB_RECLAIM_ACCOUNT
|
1816 SLAB_DESTROY_BY_RCU
),
1818 if (btrfs_inode_cachep
== NULL
|| btrfs_trans_handle_cachep
== NULL
||
1819 btrfs_transaction_cachep
== NULL
|| btrfs_bit_radix_cachep
== NULL
)
1824 static void destroy_inodecache(void)
1826 kmem_cache_destroy(btrfs_inode_cachep
);
1827 kmem_cache_destroy(btrfs_trans_handle_cachep
);
1828 kmem_cache_destroy(btrfs_transaction_cachep
);
1829 kmem_cache_destroy(btrfs_bit_radix_cachep
);
1830 kmem_cache_destroy(btrfs_path_cachep
);
1833 static int btrfs_get_sb(struct file_system_type
*fs_type
,
1834 int flags
, const char *dev_name
, void *data
, struct vfsmount
*mnt
)
1836 return get_sb_bdev(fs_type
, flags
, dev_name
, data
,
1837 btrfs_fill_super
, mnt
);
1840 static struct file_system_type btrfs_fs_type
= {
1841 .owner
= THIS_MODULE
,
1843 .get_sb
= btrfs_get_sb
,
1844 .kill_sb
= kill_block_super
,
1845 .fs_flags
= FS_REQUIRES_DEV
,
1848 static struct super_operations btrfs_super_ops
= {
1849 .statfs
= simple_statfs
,
1850 .delete_inode
= btrfs_delete_inode
,
1851 .put_super
= btrfs_put_super
,
1852 .read_inode
= btrfs_read_locked_inode
,
1853 .write_super
= btrfs_write_super
,
1854 .sync_fs
= btrfs_sync_fs
,
1855 .write_inode
= btrfs_write_inode
,
1856 .alloc_inode
= btrfs_alloc_inode
,
1857 .destroy_inode
= btrfs_destroy_inode
,
1860 static struct inode_operations btrfs_dir_inode_operations
= {
1861 .lookup
= btrfs_lookup
,
1862 .create
= btrfs_create
,
1863 .unlink
= btrfs_unlink
,
1864 .mkdir
= btrfs_mkdir
,
1865 .rmdir
= btrfs_rmdir
,
1868 static struct inode_operations btrfs_dir_ro_inode_operations
= {
1869 .lookup
= btrfs_lookup
,
1872 static struct file_operations btrfs_dir_file_operations
= {
1873 .llseek
= generic_file_llseek
,
1874 .read
= generic_read_dir
,
1875 .readdir
= btrfs_readdir
,
1876 .ioctl
= btrfs_ioctl
,
1879 static struct address_space_operations btrfs_aops
= {
1880 .readpage
= btrfs_readpage
,
1881 .readpages
= btrfs_readpages
,
1882 .writepage
= btrfs_writepage
,
1883 .sync_page
= block_sync_page
,
1884 .prepare_write
= btrfs_prepare_write
,
1885 .commit_write
= btrfs_commit_write
,
1888 static struct inode_operations btrfs_file_inode_operations
= {
1889 .truncate
= btrfs_truncate
,
1892 static struct file_operations btrfs_file_operations
= {
1893 .llseek
= generic_file_llseek
,
1894 .read
= do_sync_read
,
1895 .aio_read
= btrfs_file_aio_read
,
1896 .write
= btrfs_file_write
,
1897 .mmap
= generic_file_mmap
,
1898 .open
= generic_file_open
,
1899 .ioctl
= btrfs_ioctl
,
1902 static int __init
init_btrfs_fs(void)
1905 printk("btrfs loaded!\n");
1906 err
= init_inodecache();
1909 kset_set_kset_s(&btrfs_subsys
, fs_subsys
);
1910 err
= subsystem_register(&btrfs_subsys
);
1913 return register_filesystem(&btrfs_fs_type
);
1915 destroy_inodecache();
1919 static void __exit
exit_btrfs_fs(void)
1921 destroy_inodecache();
1922 unregister_filesystem(&btrfs_fs_type
);
1923 subsystem_unregister(&btrfs_subsys
);
1924 printk("btrfs unloaded\n");
1927 module_init(init_btrfs_fs
)
1928 module_exit(exit_btrfs_fs
)
1930 MODULE_LICENSE("GPL");