5 #include <linux/buffer_head.h>
6 #include <linux/kobject.h>
9 struct btrfs_trans_handle;
10 struct btrfs_transaction;
11 extern struct kmem_cache *btrfs_path_cachep;
13 #define BTRFS_MAGIC "_BtRfS_M"
15 #define BTRFS_ROOT_TREE_OBJECTID 1ULL
16 #define BTRFS_DEV_TREE_OBJECTID 2ULL
17 #define BTRFS_EXTENT_TREE_OBJECTID 3ULL
18 #define BTRFS_FS_TREE_OBJECTID 4ULL
19 #define BTRFS_ROOT_TREE_DIR_OBJECTID 5ULL
20 #define BTRFS_FIRST_FREE_OBJECTID 6ULL
23 * we can actually store much bigger names, but lets not confuse the rest
26 #define BTRFS_NAME_LEN 255
28 /* 32 bytes in various csum fields */
29 #define BTRFS_CSUM_SIZE 32
32 * the key defines the order in the tree, and so it also defines (optimal)
33 * block layout. objectid corresonds to the inode number. The flags
34 * tells us things about the object, and is a kind of stream selector.
35 * so for a given inode, keys with flags of 1 might refer to the inode
36 * data, flags of 2 may point to file data in the btree and flags == 3
37 * may point to extents.
39 * offset is the starting byte offset for this key in the stream.
41 * btrfs_disk_key is in disk byte order. struct btrfs_key is always
42 * in cpu native order. Otherwise they are identical and their sizes
43 * should be the same (ie both packed)
45 struct btrfs_disk_key {
49 } __attribute__ ((__packed__));
55 } __attribute__ ((__packed__));
58 * every tree block (leaf or node) starts with this header.
61 u8 csum[BTRFS_CSUM_SIZE];
62 u8 fsid[16]; /* FS specific uuid */
63 __le64 blocknr; /* which block this node is supposed to live in */
69 } __attribute__ ((__packed__));
71 #define BTRFS_MAX_LEVEL 8
72 #define BTRFS_NODEPTRS_PER_BLOCK(r) (((r)->blocksize - \
73 sizeof(struct btrfs_header)) / \
74 (sizeof(struct btrfs_disk_key) + sizeof(u64)))
75 #define __BTRFS_LEAF_DATA_SIZE(bs) ((bs) - sizeof(struct btrfs_header))
76 #define BTRFS_LEAF_DATA_SIZE(r) (__BTRFS_LEAF_DATA_SIZE(r->blocksize))
77 #define BTRFS_MAX_INLINE_DATA_SIZE(r) (BTRFS_LEAF_DATA_SIZE(r) - \
78 sizeof(struct btrfs_item) - \
79 sizeof(struct btrfs_file_extent_item))
83 * the super block basically lists the main trees of the FS
84 * it currently lacks any block count etc etc
86 struct btrfs_super_block {
87 u8 csum[BTRFS_CSUM_SIZE];
88 /* the first 3 fields must match struct btrfs_header */
89 u8 fsid[16]; /* FS specific uuid */
90 __le64 blocknr; /* this block number */
97 __le64 root_dir_objectid;
98 __le64 last_device_id;
99 /* fields below here vary with the underlying disk */
100 __le64 device_block_start;
101 __le64 device_num_blocks;
104 } __attribute__ ((__packed__));
107 * A leaf is full of items. offset and size tell us where to find
108 * the item in the leaf (relative to the start of the data area)
111 struct btrfs_disk_key key;
114 } __attribute__ ((__packed__));
117 * leaves have an item area and a data area:
118 * [item0, item1....itemN] [free space] [dataN...data1, data0]
120 * The data is separate from the items to get the keys closer together
124 struct btrfs_header header;
125 struct btrfs_item items[];
126 } __attribute__ ((__packed__));
129 * all non-leaf blocks are nodes, they hold only keys and pointers to
132 struct btrfs_key_ptr {
133 struct btrfs_disk_key key;
135 } __attribute__ ((__packed__));
138 struct btrfs_header header;
139 struct btrfs_key_ptr ptrs[];
140 } __attribute__ ((__packed__));
143 * btrfs_paths remember the path taken from the root down to the leaf.
144 * level 0 is always the leaf, and nodes[1...BTRFS_MAX_LEVEL] will point
145 * to any other levels that are present.
147 * The slots array records the index of the item or block pointer
148 * used while walking the tree.
151 struct buffer_head *nodes[BTRFS_MAX_LEVEL];
152 int slots[BTRFS_MAX_LEVEL];
156 * items in the extent btree are used to record the objectid of the
157 * owner of the block and the number of references
159 struct btrfs_extent_item {
162 } __attribute__ ((__packed__));
164 struct btrfs_inode_timespec {
167 } __attribute__ ((__packed__));
170 * there is no padding here on purpose. If you want to extent the inode,
171 * make a new item type
173 struct btrfs_inode_item {
184 struct btrfs_inode_timespec atime;
185 struct btrfs_inode_timespec ctime;
186 struct btrfs_inode_timespec mtime;
187 struct btrfs_inode_timespec otime;
188 } __attribute__ ((__packed__));
190 struct btrfs_dir_item {
191 struct btrfs_disk_key location;
195 } __attribute__ ((__packed__));
197 struct btrfs_root_item {
198 struct btrfs_inode_item inode;
205 } __attribute__ ((__packed__));
207 #define BTRFS_FILE_EXTENT_REG 0
208 #define BTRFS_FILE_EXTENT_INLINE 1
210 struct btrfs_file_extent_item {
214 * disk space consumed by the extent, checksum blocks are included
218 __le64 disk_num_blocks;
220 * the logical offset in file blocks (no csums)
221 * this extent record is for. This allows a file extent to point
222 * into the middle of an existing extent on disk, sharing it
223 * between two snapshots (useful if some bytes in the middle of the
224 * extent have changed
228 * the logical number of file blocks (no csums included)
231 } __attribute__ ((__packed__));
233 struct btrfs_csum_item {
234 u8 csum[BTRFS_CSUM_SIZE];
235 } __attribute__ ((__packed__));
237 struct btrfs_device_item {
240 } __attribute__ ((__packed__));
242 /* tag for the radix tree of block groups in ram */
243 #define BTRFS_BLOCK_GROUP_DIRTY 0
244 #define BTRFS_BLOCK_GROUP_HINTS 8
245 #define BTRFS_BLOCK_GROUP_SIZE (256 * 1024 * 1024)
246 struct btrfs_block_group_item {
248 } __attribute__ ((__packed__));
250 struct btrfs_block_group_cache {
251 struct btrfs_key key;
252 struct btrfs_block_group_item item;
256 struct btrfs_fs_info {
257 struct btrfs_root *extent_root;
258 struct btrfs_root *tree_root;
259 struct btrfs_root *dev_root;
260 struct btrfs_key last_insert;
261 struct radix_tree_root fs_roots_radix;
262 struct radix_tree_root pending_del_radix;
263 struct radix_tree_root pinned_radix;
264 struct radix_tree_root dev_radix;
265 struct radix_tree_root block_group_radix;
267 u64 extent_tree_insert[BTRFS_MAX_LEVEL * 3];
268 int extent_tree_insert_nr;
269 u64 extent_tree_prealloc[BTRFS_MAX_LEVEL * 3];
270 int extent_tree_prealloc_nr;
273 struct btrfs_transaction *running_transaction;
274 struct btrfs_super_block *disk_super;
275 struct buffer_head *sb_buffer;
276 struct super_block *sb;
277 struct inode *btree_inode;
278 struct mutex trans_mutex;
279 struct mutex fs_mutex;
280 struct list_head trans_list;
281 struct crypto_hash *hash_tfm;
282 spinlock_t hash_lock;
288 * in ram representation of the tree. extent_root is used for all allocations
289 * and for the extent tree extent_root root.
292 struct buffer_head *node;
293 struct buffer_head *commit_root;
294 struct btrfs_root_item root_item;
295 struct btrfs_key root_key;
296 struct btrfs_fs_info *fs_info;
304 u64 last_inode_alloc;
307 /* the lower bits in the key flags defines the item type */
308 #define BTRFS_KEY_TYPE_MAX 256
309 #define BTRFS_KEY_TYPE_SHIFT 24
310 #define BTRFS_KEY_TYPE_MASK (((u32)BTRFS_KEY_TYPE_MAX - 1) << \
311 BTRFS_KEY_TYPE_SHIFT)
314 * inode items have the data typically returned from stat and store other
315 * info about object characteristics. There is one for every file and dir in
318 #define BTRFS_INODE_ITEM_KEY 1
320 /* reserve 2-15 close to the inode for later flexibility */
323 * dir items are the name -> inode pointers in a directory. There is one
324 * for every name in a directory.
326 #define BTRFS_DIR_ITEM_KEY 16
327 #define BTRFS_DIR_INDEX_KEY 17
329 * extent data is for file data
331 #define BTRFS_EXTENT_DATA_KEY 18
333 * csum items have the checksums for data in the extents
335 #define BTRFS_CSUM_ITEM_KEY 19
337 /* reserve 20-31 for other file stuff */
340 * root items point to tree roots. There are typically in the root
341 * tree used by the super block to find all the other trees
343 #define BTRFS_ROOT_ITEM_KEY 32
345 * extent items are in the extent map tree. These record which blocks
346 * are used, and how many references there are to each block
348 #define BTRFS_EXTENT_ITEM_KEY 33
351 * block groups give us hints into the extent allocation trees. Which
352 * blocks are free etc etc
354 #define BTRFS_BLOCK_GROUP_ITEM_KEY 34
357 * dev items list the devices that make up the FS
359 #define BTRFS_DEV_ITEM_KEY 35
362 * string items are for debugging. They just store a short string of
365 #define BTRFS_STRING_ITEM_KEY 253
368 static inline u64 btrfs_block_group_used(struct btrfs_block_group_item *bi)
370 return le64_to_cpu(bi->used);
373 static inline void btrfs_set_block_group_used(struct
374 btrfs_block_group_item *bi,
377 bi->used = cpu_to_le64(val);
380 static inline u64 btrfs_inode_generation(struct btrfs_inode_item *i)
382 return le64_to_cpu(i->generation);
385 static inline void btrfs_set_inode_generation(struct btrfs_inode_item *i,
388 i->generation = cpu_to_le64(val);
391 static inline u64 btrfs_inode_size(struct btrfs_inode_item *i)
393 return le64_to_cpu(i->size);
396 static inline void btrfs_set_inode_size(struct btrfs_inode_item *i, u64 val)
398 i->size = cpu_to_le64(val);
401 static inline u64 btrfs_inode_nblocks(struct btrfs_inode_item *i)
403 return le64_to_cpu(i->nblocks);
406 static inline void btrfs_set_inode_nblocks(struct btrfs_inode_item *i, u64 val)
408 i->nblocks = cpu_to_le64(val);
411 static inline u32 btrfs_inode_nlink(struct btrfs_inode_item *i)
413 return le32_to_cpu(i->nlink);
416 static inline void btrfs_set_inode_nlink(struct btrfs_inode_item *i, u32 val)
418 i->nlink = cpu_to_le32(val);
421 static inline u32 btrfs_inode_uid(struct btrfs_inode_item *i)
423 return le32_to_cpu(i->uid);
426 static inline void btrfs_set_inode_uid(struct btrfs_inode_item *i, u32 val)
428 i->uid = cpu_to_le32(val);
431 static inline u32 btrfs_inode_gid(struct btrfs_inode_item *i)
433 return le32_to_cpu(i->gid);
436 static inline void btrfs_set_inode_gid(struct btrfs_inode_item *i, u32 val)
438 i->gid = cpu_to_le32(val);
441 static inline u32 btrfs_inode_mode(struct btrfs_inode_item *i)
443 return le32_to_cpu(i->mode);
446 static inline void btrfs_set_inode_mode(struct btrfs_inode_item *i, u32 val)
448 i->mode = cpu_to_le32(val);
451 static inline u32 btrfs_inode_rdev(struct btrfs_inode_item *i)
453 return le32_to_cpu(i->rdev);
456 static inline void btrfs_set_inode_rdev(struct btrfs_inode_item *i, u32 val)
458 i->rdev = cpu_to_le32(val);
461 static inline u16 btrfs_inode_flags(struct btrfs_inode_item *i)
463 return le16_to_cpu(i->flags);
466 static inline void btrfs_set_inode_flags(struct btrfs_inode_item *i, u16 val)
468 i->flags = cpu_to_le16(val);
471 static inline u16 btrfs_inode_compat_flags(struct btrfs_inode_item *i)
473 return le16_to_cpu(i->compat_flags);
476 static inline void btrfs_set_inode_compat_flags(struct btrfs_inode_item *i,
479 i->compat_flags = cpu_to_le16(val);
482 static inline u64 btrfs_timespec_sec(struct btrfs_inode_timespec *ts)
484 return le64_to_cpu(ts->sec);
487 static inline void btrfs_set_timespec_sec(struct btrfs_inode_timespec *ts,
490 ts->sec = cpu_to_le64(val);
493 static inline u32 btrfs_timespec_nsec(struct btrfs_inode_timespec *ts)
495 return le32_to_cpu(ts->nsec);
498 static inline void btrfs_set_timespec_nsec(struct btrfs_inode_timespec *ts,
501 ts->nsec = cpu_to_le32(val);
504 static inline u32 btrfs_extent_refs(struct btrfs_extent_item *ei)
506 return le32_to_cpu(ei->refs);
509 static inline void btrfs_set_extent_refs(struct btrfs_extent_item *ei, u32 val)
511 ei->refs = cpu_to_le32(val);
514 static inline u64 btrfs_extent_owner(struct btrfs_extent_item *ei)
516 return le64_to_cpu(ei->owner);
519 static inline void btrfs_set_extent_owner(struct btrfs_extent_item *ei, u64 val)
521 ei->owner = cpu_to_le64(val);
524 static inline u64 btrfs_node_blockptr(struct btrfs_node *n, int nr)
526 return le64_to_cpu(n->ptrs[nr].blockptr);
530 static inline void btrfs_set_node_blockptr(struct btrfs_node *n, int nr,
533 n->ptrs[nr].blockptr = cpu_to_le64(val);
536 static inline u32 btrfs_item_offset(struct btrfs_item *item)
538 return le32_to_cpu(item->offset);
541 static inline void btrfs_set_item_offset(struct btrfs_item *item, u32 val)
543 item->offset = cpu_to_le32(val);
546 static inline u32 btrfs_item_end(struct btrfs_item *item)
548 return le32_to_cpu(item->offset) + le16_to_cpu(item->size);
551 static inline u16 btrfs_item_size(struct btrfs_item *item)
553 return le16_to_cpu(item->size);
556 static inline void btrfs_set_item_size(struct btrfs_item *item, u16 val)
558 item->size = cpu_to_le16(val);
561 static inline u16 btrfs_dir_flags(struct btrfs_dir_item *d)
563 return le16_to_cpu(d->flags);
566 static inline void btrfs_set_dir_flags(struct btrfs_dir_item *d, u16 val)
568 d->flags = cpu_to_le16(val);
571 static inline u8 btrfs_dir_type(struct btrfs_dir_item *d)
576 static inline void btrfs_set_dir_type(struct btrfs_dir_item *d, u8 val)
581 static inline u16 btrfs_dir_name_len(struct btrfs_dir_item *d)
583 return le16_to_cpu(d->name_len);
586 static inline void btrfs_set_dir_name_len(struct btrfs_dir_item *d, u16 val)
588 d->name_len = cpu_to_le16(val);
591 static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu,
592 struct btrfs_disk_key *disk)
594 cpu->offset = le64_to_cpu(disk->offset);
595 cpu->flags = le32_to_cpu(disk->flags);
596 cpu->objectid = le64_to_cpu(disk->objectid);
599 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk,
600 struct btrfs_key *cpu)
602 disk->offset = cpu_to_le64(cpu->offset);
603 disk->flags = cpu_to_le32(cpu->flags);
604 disk->objectid = cpu_to_le64(cpu->objectid);
607 static inline u64 btrfs_disk_key_objectid(struct btrfs_disk_key *disk)
609 return le64_to_cpu(disk->objectid);
612 static inline void btrfs_set_disk_key_objectid(struct btrfs_disk_key *disk,
615 disk->objectid = cpu_to_le64(val);
618 static inline u64 btrfs_disk_key_offset(struct btrfs_disk_key *disk)
620 return le64_to_cpu(disk->offset);
623 static inline void btrfs_set_disk_key_offset(struct btrfs_disk_key *disk,
626 disk->offset = cpu_to_le64(val);
629 static inline u32 btrfs_disk_key_flags(struct btrfs_disk_key *disk)
631 return le32_to_cpu(disk->flags);
634 static inline void btrfs_set_disk_key_flags(struct btrfs_disk_key *disk,
637 disk->flags = cpu_to_le32(val);
640 static inline u32 btrfs_disk_key_type(struct btrfs_disk_key *key)
642 return le32_to_cpu(key->flags) >> BTRFS_KEY_TYPE_SHIFT;
645 static inline void btrfs_set_disk_key_type(struct btrfs_disk_key *key,
648 u32 flags = btrfs_disk_key_flags(key);
649 BUG_ON(val >= BTRFS_KEY_TYPE_MAX);
650 val = val << BTRFS_KEY_TYPE_SHIFT;
651 flags = (flags & ~BTRFS_KEY_TYPE_MASK) | val;
652 btrfs_set_disk_key_flags(key, flags);
655 static inline u32 btrfs_key_type(struct btrfs_key *key)
657 return key->flags >> BTRFS_KEY_TYPE_SHIFT;
660 static inline void btrfs_set_key_type(struct btrfs_key *key, u32 val)
662 BUG_ON(val >= BTRFS_KEY_TYPE_MAX);
663 val = val << BTRFS_KEY_TYPE_SHIFT;
664 key->flags = (key->flags & ~(BTRFS_KEY_TYPE_MASK)) | val;
667 static inline u64 btrfs_header_blocknr(struct btrfs_header *h)
669 return le64_to_cpu(h->blocknr);
672 static inline void btrfs_set_header_blocknr(struct btrfs_header *h, u64 blocknr)
674 h->blocknr = cpu_to_le64(blocknr);
677 static inline u64 btrfs_header_generation(struct btrfs_header *h)
679 return le64_to_cpu(h->generation);
682 static inline void btrfs_set_header_generation(struct btrfs_header *h,
685 h->generation = cpu_to_le64(val);
688 static inline u64 btrfs_header_owner(struct btrfs_header *h)
690 return le64_to_cpu(h->owner);
693 static inline void btrfs_set_header_owner(struct btrfs_header *h,
696 h->owner = cpu_to_le64(val);
699 static inline u16 btrfs_header_nritems(struct btrfs_header *h)
701 return le16_to_cpu(h->nritems);
704 static inline void btrfs_set_header_nritems(struct btrfs_header *h, u16 val)
706 h->nritems = cpu_to_le16(val);
709 static inline u16 btrfs_header_flags(struct btrfs_header *h)
711 return le16_to_cpu(h->flags);
714 static inline void btrfs_set_header_flags(struct btrfs_header *h, u16 val)
716 h->flags = cpu_to_le16(val);
719 static inline int btrfs_header_level(struct btrfs_header *h)
724 static inline void btrfs_set_header_level(struct btrfs_header *h, int level)
726 BUG_ON(level > BTRFS_MAX_LEVEL);
730 static inline int btrfs_is_leaf(struct btrfs_node *n)
732 return (btrfs_header_level(&n->header) == 0);
735 static inline u64 btrfs_root_blocknr(struct btrfs_root_item *item)
737 return le64_to_cpu(item->blocknr);
740 static inline void btrfs_set_root_blocknr(struct btrfs_root_item *item, u64 val)
742 item->blocknr = cpu_to_le64(val);
745 static inline u64 btrfs_root_dirid(struct btrfs_root_item *item)
747 return le64_to_cpu(item->root_dirid);
750 static inline void btrfs_set_root_dirid(struct btrfs_root_item *item, u64 val)
752 item->root_dirid = cpu_to_le64(val);
755 static inline u32 btrfs_root_refs(struct btrfs_root_item *item)
757 return le32_to_cpu(item->refs);
760 static inline void btrfs_set_root_refs(struct btrfs_root_item *item, u32 val)
762 item->refs = cpu_to_le32(val);
765 static inline u64 btrfs_super_blocknr(struct btrfs_super_block *s)
767 return le64_to_cpu(s->blocknr);
770 static inline void btrfs_set_super_blocknr(struct btrfs_super_block *s, u64 val)
772 s->blocknr = cpu_to_le64(val);
775 static inline u64 btrfs_super_generation(struct btrfs_super_block *s)
777 return le64_to_cpu(s->generation);
780 static inline void btrfs_set_super_generation(struct btrfs_super_block *s,
783 s->generation = cpu_to_le64(val);
786 static inline u64 btrfs_super_root(struct btrfs_super_block *s)
788 return le64_to_cpu(s->root);
791 static inline void btrfs_set_super_root(struct btrfs_super_block *s, u64 val)
793 s->root = cpu_to_le64(val);
796 static inline u64 btrfs_super_total_blocks(struct btrfs_super_block *s)
798 return le64_to_cpu(s->total_blocks);
801 static inline void btrfs_set_super_total_blocks(struct btrfs_super_block *s,
804 s->total_blocks = cpu_to_le64(val);
807 static inline u64 btrfs_super_blocks_used(struct btrfs_super_block *s)
809 return le64_to_cpu(s->blocks_used);
812 static inline void btrfs_set_super_blocks_used(struct btrfs_super_block *s,
815 s->blocks_used = cpu_to_le64(val);
818 static inline u32 btrfs_super_blocksize(struct btrfs_super_block *s)
820 return le32_to_cpu(s->blocksize);
823 static inline void btrfs_set_super_blocksize(struct btrfs_super_block *s,
826 s->blocksize = cpu_to_le32(val);
829 static inline u64 btrfs_super_root_dir(struct btrfs_super_block *s)
831 return le64_to_cpu(s->root_dir_objectid);
834 static inline void btrfs_set_super_root_dir(struct btrfs_super_block *s, u64
837 s->root_dir_objectid = cpu_to_le64(val);
840 static inline u64 btrfs_super_last_device_id(struct btrfs_super_block *s)
842 return le64_to_cpu(s->last_device_id);
845 static inline void btrfs_set_super_last_device_id(struct btrfs_super_block *s,
848 s->last_device_id = cpu_to_le64(val);
851 static inline u64 btrfs_super_device_id(struct btrfs_super_block *s)
853 return le64_to_cpu(s->device_id);
856 static inline void btrfs_set_super_device_id(struct btrfs_super_block *s,
859 s->device_id = cpu_to_le64(val);
862 static inline u64 btrfs_super_device_block_start(struct btrfs_super_block *s)
864 return le64_to_cpu(s->device_block_start);
867 static inline void btrfs_set_super_device_block_start(struct btrfs_super_block
870 s->device_block_start = cpu_to_le64(val);
873 static inline u64 btrfs_super_device_num_blocks(struct btrfs_super_block *s)
875 return le64_to_cpu(s->device_num_blocks);
878 static inline void btrfs_set_super_device_num_blocks(struct btrfs_super_block
881 s->device_num_blocks = cpu_to_le64(val);
884 static inline u64 btrfs_super_device_root(struct btrfs_super_block *s)
886 return le64_to_cpu(s->device_root);
889 static inline void btrfs_set_super_device_root(struct btrfs_super_block
892 s->device_root = cpu_to_le64(val);
896 static inline u8 *btrfs_leaf_data(struct btrfs_leaf *l)
898 return (u8 *)l->items;
901 static inline int btrfs_file_extent_type(struct btrfs_file_extent_item *e)
905 static inline void btrfs_set_file_extent_type(struct btrfs_file_extent_item *e,
911 static inline char *btrfs_file_extent_inline_start(struct
912 btrfs_file_extent_item *e)
914 return (char *)(&e->disk_blocknr);
917 static inline u32 btrfs_file_extent_calc_inline_size(u32 datasize)
919 return (unsigned long)(&((struct
920 btrfs_file_extent_item *)NULL)->disk_blocknr) + datasize;
923 static inline u32 btrfs_file_extent_inline_len(struct btrfs_item *e)
925 struct btrfs_file_extent_item *fe = NULL;
926 return btrfs_item_size(e) - (unsigned long)(&fe->disk_blocknr);
929 static inline u64 btrfs_file_extent_disk_blocknr(struct btrfs_file_extent_item
932 return le64_to_cpu(e->disk_blocknr);
935 static inline void btrfs_set_file_extent_disk_blocknr(struct
936 btrfs_file_extent_item
939 e->disk_blocknr = cpu_to_le64(val);
942 static inline u64 btrfs_file_extent_generation(struct btrfs_file_extent_item *e)
944 return le64_to_cpu(e->generation);
947 static inline void btrfs_set_file_extent_generation(struct
948 btrfs_file_extent_item *e,
951 e->generation = cpu_to_le64(val);
954 static inline u64 btrfs_file_extent_disk_num_blocks(struct
955 btrfs_file_extent_item *e)
957 return le64_to_cpu(e->disk_num_blocks);
960 static inline void btrfs_set_file_extent_disk_num_blocks(struct
961 btrfs_file_extent_item
964 e->disk_num_blocks = cpu_to_le64(val);
967 static inline u64 btrfs_file_extent_offset(struct btrfs_file_extent_item *e)
969 return le64_to_cpu(e->offset);
972 static inline void btrfs_set_file_extent_offset(struct btrfs_file_extent_item
975 e->offset = cpu_to_le64(val);
978 static inline u64 btrfs_file_extent_num_blocks(struct btrfs_file_extent_item
981 return le64_to_cpu(e->num_blocks);
984 static inline void btrfs_set_file_extent_num_blocks(struct
985 btrfs_file_extent_item *e,
988 e->num_blocks = cpu_to_le64(val);
991 static inline u16 btrfs_device_pathlen(struct btrfs_device_item *d)
993 return le16_to_cpu(d->pathlen);
996 static inline void btrfs_set_device_pathlen(struct btrfs_device_item *d,
999 d->pathlen = cpu_to_le16(val);
1002 static inline u64 btrfs_device_id(struct btrfs_device_item *d)
1004 return le64_to_cpu(d->device_id);
1007 static inline void btrfs_set_device_id(struct btrfs_device_item *d,
1010 d->device_id = cpu_to_le64(val);
1013 static inline struct btrfs_root *btrfs_sb(struct super_block *sb)
1015 return sb->s_fs_info;
1018 static inline void btrfs_check_bounds(void *vptr, size_t len,
1019 void *vcontainer, size_t container_len)
1022 char *container = vcontainer;
1023 WARN_ON(ptr < container);
1024 WARN_ON(ptr + len > container + container_len);
1027 static inline void btrfs_memcpy(struct btrfs_root *root,
1029 void *dst, const void *src, size_t nr)
1031 btrfs_check_bounds(dst, nr, dst_block, root->fs_info->sb->s_blocksize);
1032 memcpy(dst, src, nr);
1035 static inline void btrfs_memmove(struct btrfs_root *root,
1037 void *dst, void *src, size_t nr)
1039 btrfs_check_bounds(dst, nr, dst_block, root->fs_info->sb->s_blocksize);
1040 memmove(dst, src, nr);
1043 static inline void btrfs_mark_buffer_dirty(struct buffer_head *bh)
1045 WARN_ON(!atomic_read(&bh->b_count));
1046 mark_buffer_dirty(bh);
1049 /* helper function to cast into the data area of the leaf. */
1050 #define btrfs_item_ptr(leaf, slot, type) \
1051 ((type *)(btrfs_leaf_data(leaf) + \
1052 btrfs_item_offset((leaf)->items + (slot))))
1055 int btrfs_inc_root_ref(struct btrfs_trans_handle *trans,
1056 struct btrfs_root *root);
1057 struct buffer_head *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
1058 struct btrfs_root *root);
1059 int btrfs_alloc_extent(struct btrfs_trans_handle *trans,
1060 struct btrfs_root *root, u64 owner,
1061 u64 num_blocks, u64 search_start,
1062 u64 search_end, struct btrfs_key *ins);
1063 int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1064 struct buffer_head *buf);
1065 int btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
1066 *root, u64 blocknr, u64 num_blocks, int pin);
1067 int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans, struct
1069 int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
1070 struct btrfs_root *root,
1071 u64 blocknr, u64 num_blocks);
1072 int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans,
1073 struct btrfs_root *root);
1074 int btrfs_free_block_groups(struct btrfs_fs_info *info);
1075 int btrfs_read_block_groups(struct btrfs_root *root);
1077 int btrfs_extend_item(struct btrfs_trans_handle *trans, struct btrfs_root
1078 *root, struct btrfs_path *path, u32 data_size);
1079 int btrfs_truncate_item(struct btrfs_trans_handle *trans,
1080 struct btrfs_root *root,
1081 struct btrfs_path *path,
1083 int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root
1084 *root, struct btrfs_key *key, struct btrfs_path *p, int
1086 void btrfs_release_path(struct btrfs_root *root, struct btrfs_path *p);
1087 struct btrfs_path *btrfs_alloc_path(void);
1088 void btrfs_free_path(struct btrfs_path *p);
1089 void btrfs_init_path(struct btrfs_path *p);
1090 int btrfs_del_item(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1091 struct btrfs_path *path);
1092 int btrfs_insert_item(struct btrfs_trans_handle *trans, struct btrfs_root
1093 *root, struct btrfs_key *key, void *data, u32 data_size);
1094 int btrfs_insert_empty_item(struct btrfs_trans_handle *trans, struct btrfs_root
1095 *root, struct btrfs_path *path, struct btrfs_key
1096 *cpu_key, u32 data_size);
1097 int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path);
1098 int btrfs_leaf_free_space(struct btrfs_root *root, struct btrfs_leaf *leaf);
1099 int btrfs_drop_snapshot(struct btrfs_trans_handle *trans, struct btrfs_root
1100 *root, struct buffer_head *snap);
1102 int btrfs_del_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1103 struct btrfs_key *key);
1104 int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root
1105 *root, struct btrfs_key *key, struct btrfs_root_item
1107 int btrfs_update_root(struct btrfs_trans_handle *trans, struct btrfs_root
1108 *root, struct btrfs_key *key, struct btrfs_root_item
1110 int btrfs_find_last_root(struct btrfs_root *root, u64 objectid, struct
1111 btrfs_root_item *item, struct btrfs_key *key);
1113 int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
1114 *root, const char *name, int name_len, u64 dir,
1115 struct btrfs_key *location, u8 type);
1116 struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans,
1117 struct btrfs_root *root,
1118 struct btrfs_path *path, u64 dir,
1119 const char *name, int name_len,
1121 struct btrfs_dir_item *
1122 btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans,
1123 struct btrfs_root *root,
1124 struct btrfs_path *path, u64 dir,
1125 u64 objectid, const char *name, int name_len,
1127 struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_root *root,
1128 struct btrfs_path *path,
1129 const char *name, int name_len);
1130 int btrfs_delete_one_dir_name(struct btrfs_trans_handle *trans,
1131 struct btrfs_root *root,
1132 struct btrfs_path *path,
1133 struct btrfs_dir_item *di);
1135 int btrfs_find_free_objectid(struct btrfs_trans_handle *trans,
1136 struct btrfs_root *fs_root,
1137 u64 dirid, u64 *objectid);
1138 int btrfs_find_highest_inode(struct btrfs_root *fs_root, u64 *objectid);
1141 int btrfs_insert_inode(struct btrfs_trans_handle *trans, struct btrfs_root
1142 *root, u64 objectid, struct btrfs_inode_item
1144 int btrfs_lookup_inode(struct btrfs_trans_handle *trans, struct btrfs_root
1145 *root, struct btrfs_path *path,
1146 struct btrfs_key *location, int mod);
1149 int btrfs_insert_file_extent(struct btrfs_trans_handle *trans,
1150 struct btrfs_root *root,
1151 u64 objectid, u64 pos, u64 offset,
1153 int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
1154 struct btrfs_root *root,
1155 struct btrfs_path *path, u64 objectid,
1156 u64 blocknr, int mod);
1157 int btrfs_csum_file_block(struct btrfs_trans_handle *trans,
1158 struct btrfs_root *root,
1159 u64 objectid, u64 offset,
1160 char *data, size_t len);
1161 int btrfs_csum_verify_file_block(struct btrfs_root *root,
1162 u64 objectid, u64 offset,
1163 char *data, size_t len);
1164 struct btrfs_csum_item *btrfs_lookup_csum(struct btrfs_trans_handle *trans,
1165 struct btrfs_root *root,
1166 struct btrfs_path *path,
1167 u64 objectid, u64 offset,
1170 extern struct subsystem btrfs_subsys;