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_trans_handle_cachep;
12 extern struct kmem_cache *btrfs_transaction_cachep;
13 extern struct kmem_cache *btrfs_bit_radix_cachep;
14 extern struct kmem_cache *btrfs_path_cachep;
16 #define BTRFS_MAGIC "_BtRfS_M"
18 #define BTRFS_ROOT_TREE_OBJECTID 1ULL
19 #define BTRFS_DEV_TREE_OBJECTID 2ULL
20 #define BTRFS_EXTENT_TREE_OBJECTID 3ULL
21 #define BTRFS_FS_TREE_OBJECTID 4ULL
22 #define BTRFS_ROOT_TREE_DIR_OBJECTID 5ULL
23 #define BTRFS_FIRST_FREE_OBJECTID 6ULL
26 * we can actually store much bigger names, but lets not confuse the rest
29 #define BTRFS_NAME_LEN 255
31 /* 32 bytes in various csum fields */
32 #define BTRFS_CSUM_SIZE 32
35 * the key defines the order in the tree, and so it also defines (optimal)
36 * block layout. objectid corresonds to the inode number. The flags
37 * tells us things about the object, and is a kind of stream selector.
38 * so for a given inode, keys with flags of 1 might refer to the inode
39 * data, flags of 2 may point to file data in the btree and flags == 3
40 * may point to extents.
42 * offset is the starting byte offset for this key in the stream.
44 * btrfs_disk_key is in disk byte order. struct btrfs_key is always
45 * in cpu native order. Otherwise they are identical and their sizes
46 * should be the same (ie both packed)
48 struct btrfs_disk_key {
52 } __attribute__ ((__packed__));
58 } __attribute__ ((__packed__));
61 * every tree block (leaf or node) starts with this header.
64 u8 csum[BTRFS_CSUM_SIZE];
65 u8 fsid[16]; /* FS specific uuid */
66 __le64 blocknr; /* which block this node is supposed to live in */
72 } __attribute__ ((__packed__));
74 #define BTRFS_MAX_LEVEL 8
75 #define BTRFS_NODEPTRS_PER_BLOCK(r) (((r)->blocksize - \
76 sizeof(struct btrfs_header)) / \
77 (sizeof(struct btrfs_disk_key) + sizeof(u64)))
78 #define __BTRFS_LEAF_DATA_SIZE(bs) ((bs) - sizeof(struct btrfs_header))
79 #define BTRFS_LEAF_DATA_SIZE(r) (__BTRFS_LEAF_DATA_SIZE(r->blocksize))
80 #define BTRFS_MAX_INLINE_DATA_SIZE(r) (BTRFS_LEAF_DATA_SIZE(r) - \
81 sizeof(struct btrfs_item) - \
82 sizeof(struct btrfs_file_extent_item))
86 * the super block basically lists the main trees of the FS
87 * it currently lacks any block count etc etc
89 struct btrfs_super_block {
90 u8 csum[BTRFS_CSUM_SIZE];
91 /* the first 3 fields must match struct btrfs_header */
92 u8 fsid[16]; /* FS specific uuid */
93 __le64 blocknr; /* this block number */
100 __le64 root_dir_objectid;
101 __le64 last_device_id;
102 /* fields below here vary with the underlying disk */
103 __le64 device_block_start;
104 __le64 device_num_blocks;
107 } __attribute__ ((__packed__));
110 * A leaf is full of items. offset and size tell us where to find
111 * the item in the leaf (relative to the start of the data area)
114 struct btrfs_disk_key key;
117 } __attribute__ ((__packed__));
120 * leaves have an item area and a data area:
121 * [item0, item1....itemN] [free space] [dataN...data1, data0]
123 * The data is separate from the items to get the keys closer together
127 struct btrfs_header header;
128 struct btrfs_item items[];
129 } __attribute__ ((__packed__));
132 * all non-leaf blocks are nodes, they hold only keys and pointers to
135 struct btrfs_key_ptr {
136 struct btrfs_disk_key key;
138 } __attribute__ ((__packed__));
141 struct btrfs_header header;
142 struct btrfs_key_ptr ptrs[];
143 } __attribute__ ((__packed__));
146 * btrfs_paths remember the path taken from the root down to the leaf.
147 * level 0 is always the leaf, and nodes[1...BTRFS_MAX_LEVEL] will point
148 * to any other levels that are present.
150 * The slots array records the index of the item or block pointer
151 * used while walking the tree.
154 struct buffer_head *nodes[BTRFS_MAX_LEVEL];
155 int slots[BTRFS_MAX_LEVEL];
159 * items in the extent btree are used to record the objectid of the
160 * owner of the block and the number of references
162 struct btrfs_extent_item {
165 } __attribute__ ((__packed__));
167 struct btrfs_inode_timespec {
170 } __attribute__ ((__packed__));
173 * there is no padding here on purpose. If you want to extent the inode,
174 * make a new item type
176 struct btrfs_inode_item {
188 struct btrfs_inode_timespec atime;
189 struct btrfs_inode_timespec ctime;
190 struct btrfs_inode_timespec mtime;
191 struct btrfs_inode_timespec otime;
192 } __attribute__ ((__packed__));
194 struct btrfs_dir_item {
195 struct btrfs_disk_key location;
199 } __attribute__ ((__packed__));
201 struct btrfs_root_item {
202 struct btrfs_inode_item inode;
209 } __attribute__ ((__packed__));
211 #define BTRFS_FILE_EXTENT_REG 0
212 #define BTRFS_FILE_EXTENT_INLINE 1
214 struct btrfs_file_extent_item {
218 * disk space consumed by the extent, checksum blocks are included
222 __le64 disk_num_blocks;
224 * the logical offset in file blocks (no csums)
225 * this extent record is for. This allows a file extent to point
226 * into the middle of an existing extent on disk, sharing it
227 * between two snapshots (useful if some bytes in the middle of the
228 * extent have changed
232 * the logical number of file blocks (no csums included)
235 } __attribute__ ((__packed__));
237 struct btrfs_csum_item {
238 u8 csum[BTRFS_CSUM_SIZE];
239 } __attribute__ ((__packed__));
241 struct btrfs_device_item {
244 } __attribute__ ((__packed__));
246 /* tag for the radix tree of block groups in ram */
247 #define BTRFS_BLOCK_GROUP_DIRTY 0
248 #define BTRFS_BLOCK_GROUP_AVAIL 1
249 #define BTRFS_BLOCK_GROUP_HINTS 8
250 #define BTRFS_BLOCK_GROUP_SIZE (256 * 1024 * 1024)
251 struct btrfs_block_group_item {
253 } __attribute__ ((__packed__));
255 struct btrfs_block_group_cache {
256 struct btrfs_key key;
257 struct btrfs_block_group_item item;
263 struct btrfs_fs_info {
264 struct btrfs_root *extent_root;
265 struct btrfs_root *tree_root;
266 struct btrfs_root *dev_root;
267 struct btrfs_block_group_cache *block_group_cache;
268 struct radix_tree_root fs_roots_radix;
269 struct radix_tree_root pending_del_radix;
270 struct radix_tree_root pinned_radix;
271 struct radix_tree_root dev_radix;
272 struct radix_tree_root block_group_radix;
274 u64 extent_tree_insert[BTRFS_MAX_LEVEL * 3];
275 int extent_tree_insert_nr;
276 u64 extent_tree_prealloc[BTRFS_MAX_LEVEL * 3];
277 int extent_tree_prealloc_nr;
280 struct btrfs_transaction *running_transaction;
281 struct btrfs_super_block *disk_super;
282 struct buffer_head *sb_buffer;
283 struct super_block *sb;
284 struct inode *btree_inode;
285 struct mutex trans_mutex;
286 struct mutex fs_mutex;
287 struct list_head trans_list;
288 struct crypto_hash *hash_tfm;
289 spinlock_t hash_lock;
295 * in ram representation of the tree. extent_root is used for all allocations
296 * and for the extent tree extent_root root.
299 struct buffer_head *node;
300 struct buffer_head *commit_root;
301 struct btrfs_root_item root_item;
302 struct btrfs_key root_key;
303 struct btrfs_fs_info *fs_info;
311 u64 last_inode_alloc;
314 /* the lower bits in the key flags defines the item type */
315 #define BTRFS_KEY_TYPE_MAX 256
316 #define BTRFS_KEY_TYPE_SHIFT 24
317 #define BTRFS_KEY_TYPE_MASK (((u32)BTRFS_KEY_TYPE_MAX - 1) << \
318 BTRFS_KEY_TYPE_SHIFT)
321 * inode items have the data typically returned from stat and store other
322 * info about object characteristics. There is one for every file and dir in
325 #define BTRFS_INODE_ITEM_KEY 1
327 /* reserve 2-15 close to the inode for later flexibility */
330 * dir items are the name -> inode pointers in a directory. There is one
331 * for every name in a directory.
333 #define BTRFS_DIR_ITEM_KEY 16
334 #define BTRFS_DIR_INDEX_KEY 17
336 * extent data is for file data
338 #define BTRFS_EXTENT_DATA_KEY 18
340 * csum items have the checksums for data in the extents
342 #define BTRFS_CSUM_ITEM_KEY 19
344 /* reserve 20-31 for other file stuff */
347 * root items point to tree roots. There are typically in the root
348 * tree used by the super block to find all the other trees
350 #define BTRFS_ROOT_ITEM_KEY 32
352 * extent items are in the extent map tree. These record which blocks
353 * are used, and how many references there are to each block
355 #define BTRFS_EXTENT_ITEM_KEY 33
358 * block groups give us hints into the extent allocation trees. Which
359 * blocks are free etc etc
361 #define BTRFS_BLOCK_GROUP_ITEM_KEY 34
364 * dev items list the devices that make up the FS
366 #define BTRFS_DEV_ITEM_KEY 35
369 * string items are for debugging. They just store a short string of
372 #define BTRFS_STRING_ITEM_KEY 253
375 static inline u64 btrfs_block_group_used(struct btrfs_block_group_item *bi)
377 return le64_to_cpu(bi->used);
380 static inline void btrfs_set_block_group_used(struct
381 btrfs_block_group_item *bi,
384 bi->used = cpu_to_le64(val);
387 static inline u64 btrfs_inode_generation(struct btrfs_inode_item *i)
389 return le64_to_cpu(i->generation);
392 static inline void btrfs_set_inode_generation(struct btrfs_inode_item *i,
395 i->generation = cpu_to_le64(val);
398 static inline u64 btrfs_inode_size(struct btrfs_inode_item *i)
400 return le64_to_cpu(i->size);
403 static inline void btrfs_set_inode_size(struct btrfs_inode_item *i, u64 val)
405 i->size = cpu_to_le64(val);
408 static inline u64 btrfs_inode_nblocks(struct btrfs_inode_item *i)
410 return le64_to_cpu(i->nblocks);
413 static inline void btrfs_set_inode_nblocks(struct btrfs_inode_item *i, u64 val)
415 i->nblocks = cpu_to_le64(val);
418 static inline u64 btrfs_inode_block_group(struct btrfs_inode_item *i)
420 return le64_to_cpu(i->block_group);
423 static inline void btrfs_set_inode_block_group(struct btrfs_inode_item *i,
426 i->block_group = cpu_to_le64(val);
429 static inline u32 btrfs_inode_nlink(struct btrfs_inode_item *i)
431 return le32_to_cpu(i->nlink);
434 static inline void btrfs_set_inode_nlink(struct btrfs_inode_item *i, u32 val)
436 i->nlink = cpu_to_le32(val);
439 static inline u32 btrfs_inode_uid(struct btrfs_inode_item *i)
441 return le32_to_cpu(i->uid);
444 static inline void btrfs_set_inode_uid(struct btrfs_inode_item *i, u32 val)
446 i->uid = cpu_to_le32(val);
449 static inline u32 btrfs_inode_gid(struct btrfs_inode_item *i)
451 return le32_to_cpu(i->gid);
454 static inline void btrfs_set_inode_gid(struct btrfs_inode_item *i, u32 val)
456 i->gid = cpu_to_le32(val);
459 static inline u32 btrfs_inode_mode(struct btrfs_inode_item *i)
461 return le32_to_cpu(i->mode);
464 static inline void btrfs_set_inode_mode(struct btrfs_inode_item *i, u32 val)
466 i->mode = cpu_to_le32(val);
469 static inline u32 btrfs_inode_rdev(struct btrfs_inode_item *i)
471 return le32_to_cpu(i->rdev);
474 static inline void btrfs_set_inode_rdev(struct btrfs_inode_item *i, u32 val)
476 i->rdev = cpu_to_le32(val);
479 static inline u16 btrfs_inode_flags(struct btrfs_inode_item *i)
481 return le16_to_cpu(i->flags);
484 static inline void btrfs_set_inode_flags(struct btrfs_inode_item *i, u16 val)
486 i->flags = cpu_to_le16(val);
489 static inline u16 btrfs_inode_compat_flags(struct btrfs_inode_item *i)
491 return le16_to_cpu(i->compat_flags);
494 static inline void btrfs_set_inode_compat_flags(struct btrfs_inode_item *i,
497 i->compat_flags = cpu_to_le16(val);
500 static inline u64 btrfs_timespec_sec(struct btrfs_inode_timespec *ts)
502 return le64_to_cpu(ts->sec);
505 static inline void btrfs_set_timespec_sec(struct btrfs_inode_timespec *ts,
508 ts->sec = cpu_to_le64(val);
511 static inline u32 btrfs_timespec_nsec(struct btrfs_inode_timespec *ts)
513 return le32_to_cpu(ts->nsec);
516 static inline void btrfs_set_timespec_nsec(struct btrfs_inode_timespec *ts,
519 ts->nsec = cpu_to_le32(val);
522 static inline u32 btrfs_extent_refs(struct btrfs_extent_item *ei)
524 return le32_to_cpu(ei->refs);
527 static inline void btrfs_set_extent_refs(struct btrfs_extent_item *ei, u32 val)
529 ei->refs = cpu_to_le32(val);
532 static inline u64 btrfs_extent_owner(struct btrfs_extent_item *ei)
534 return le64_to_cpu(ei->owner);
537 static inline void btrfs_set_extent_owner(struct btrfs_extent_item *ei, u64 val)
539 ei->owner = cpu_to_le64(val);
542 static inline u64 btrfs_node_blockptr(struct btrfs_node *n, int nr)
544 return le64_to_cpu(n->ptrs[nr].blockptr);
548 static inline void btrfs_set_node_blockptr(struct btrfs_node *n, int nr,
551 n->ptrs[nr].blockptr = cpu_to_le64(val);
554 static inline u32 btrfs_item_offset(struct btrfs_item *item)
556 return le32_to_cpu(item->offset);
559 static inline void btrfs_set_item_offset(struct btrfs_item *item, u32 val)
561 item->offset = cpu_to_le32(val);
564 static inline u32 btrfs_item_end(struct btrfs_item *item)
566 return le32_to_cpu(item->offset) + le16_to_cpu(item->size);
569 static inline u16 btrfs_item_size(struct btrfs_item *item)
571 return le16_to_cpu(item->size);
574 static inline void btrfs_set_item_size(struct btrfs_item *item, u16 val)
576 item->size = cpu_to_le16(val);
579 static inline u16 btrfs_dir_flags(struct btrfs_dir_item *d)
581 return le16_to_cpu(d->flags);
584 static inline void btrfs_set_dir_flags(struct btrfs_dir_item *d, u16 val)
586 d->flags = cpu_to_le16(val);
589 static inline u8 btrfs_dir_type(struct btrfs_dir_item *d)
594 static inline void btrfs_set_dir_type(struct btrfs_dir_item *d, u8 val)
599 static inline u16 btrfs_dir_name_len(struct btrfs_dir_item *d)
601 return le16_to_cpu(d->name_len);
604 static inline void btrfs_set_dir_name_len(struct btrfs_dir_item *d, u16 val)
606 d->name_len = cpu_to_le16(val);
609 static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu,
610 struct btrfs_disk_key *disk)
612 cpu->offset = le64_to_cpu(disk->offset);
613 cpu->flags = le32_to_cpu(disk->flags);
614 cpu->objectid = le64_to_cpu(disk->objectid);
617 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk,
618 struct btrfs_key *cpu)
620 disk->offset = cpu_to_le64(cpu->offset);
621 disk->flags = cpu_to_le32(cpu->flags);
622 disk->objectid = cpu_to_le64(cpu->objectid);
625 static inline u64 btrfs_disk_key_objectid(struct btrfs_disk_key *disk)
627 return le64_to_cpu(disk->objectid);
630 static inline void btrfs_set_disk_key_objectid(struct btrfs_disk_key *disk,
633 disk->objectid = cpu_to_le64(val);
636 static inline u64 btrfs_disk_key_offset(struct btrfs_disk_key *disk)
638 return le64_to_cpu(disk->offset);
641 static inline void btrfs_set_disk_key_offset(struct btrfs_disk_key *disk,
644 disk->offset = cpu_to_le64(val);
647 static inline u32 btrfs_disk_key_flags(struct btrfs_disk_key *disk)
649 return le32_to_cpu(disk->flags);
652 static inline void btrfs_set_disk_key_flags(struct btrfs_disk_key *disk,
655 disk->flags = cpu_to_le32(val);
658 static inline u32 btrfs_disk_key_type(struct btrfs_disk_key *key)
660 return le32_to_cpu(key->flags) >> BTRFS_KEY_TYPE_SHIFT;
663 static inline void btrfs_set_disk_key_type(struct btrfs_disk_key *key,
666 u32 flags = btrfs_disk_key_flags(key);
667 BUG_ON(val >= BTRFS_KEY_TYPE_MAX);
668 val = val << BTRFS_KEY_TYPE_SHIFT;
669 flags = (flags & ~BTRFS_KEY_TYPE_MASK) | val;
670 btrfs_set_disk_key_flags(key, flags);
673 static inline u32 btrfs_key_type(struct btrfs_key *key)
675 return key->flags >> BTRFS_KEY_TYPE_SHIFT;
678 static inline void btrfs_set_key_type(struct btrfs_key *key, u32 val)
680 BUG_ON(val >= BTRFS_KEY_TYPE_MAX);
681 val = val << BTRFS_KEY_TYPE_SHIFT;
682 key->flags = (key->flags & ~(BTRFS_KEY_TYPE_MASK)) | val;
685 static inline u64 btrfs_header_blocknr(struct btrfs_header *h)
687 return le64_to_cpu(h->blocknr);
690 static inline void btrfs_set_header_blocknr(struct btrfs_header *h, u64 blocknr)
692 h->blocknr = cpu_to_le64(blocknr);
695 static inline u64 btrfs_header_generation(struct btrfs_header *h)
697 return le64_to_cpu(h->generation);
700 static inline void btrfs_set_header_generation(struct btrfs_header *h,
703 h->generation = cpu_to_le64(val);
706 static inline u64 btrfs_header_owner(struct btrfs_header *h)
708 return le64_to_cpu(h->owner);
711 static inline void btrfs_set_header_owner(struct btrfs_header *h,
714 h->owner = cpu_to_le64(val);
717 static inline u16 btrfs_header_nritems(struct btrfs_header *h)
719 return le16_to_cpu(h->nritems);
722 static inline void btrfs_set_header_nritems(struct btrfs_header *h, u16 val)
724 h->nritems = cpu_to_le16(val);
727 static inline u16 btrfs_header_flags(struct btrfs_header *h)
729 return le16_to_cpu(h->flags);
732 static inline void btrfs_set_header_flags(struct btrfs_header *h, u16 val)
734 h->flags = cpu_to_le16(val);
737 static inline int btrfs_header_level(struct btrfs_header *h)
742 static inline void btrfs_set_header_level(struct btrfs_header *h, int level)
744 BUG_ON(level > BTRFS_MAX_LEVEL);
748 static inline int btrfs_is_leaf(struct btrfs_node *n)
750 return (btrfs_header_level(&n->header) == 0);
753 static inline u64 btrfs_root_blocknr(struct btrfs_root_item *item)
755 return le64_to_cpu(item->blocknr);
758 static inline void btrfs_set_root_blocknr(struct btrfs_root_item *item, u64 val)
760 item->blocknr = cpu_to_le64(val);
763 static inline u64 btrfs_root_dirid(struct btrfs_root_item *item)
765 return le64_to_cpu(item->root_dirid);
768 static inline void btrfs_set_root_dirid(struct btrfs_root_item *item, u64 val)
770 item->root_dirid = cpu_to_le64(val);
773 static inline u32 btrfs_root_refs(struct btrfs_root_item *item)
775 return le32_to_cpu(item->refs);
778 static inline void btrfs_set_root_refs(struct btrfs_root_item *item, u32 val)
780 item->refs = cpu_to_le32(val);
783 static inline u64 btrfs_super_blocknr(struct btrfs_super_block *s)
785 return le64_to_cpu(s->blocknr);
788 static inline void btrfs_set_super_blocknr(struct btrfs_super_block *s, u64 val)
790 s->blocknr = cpu_to_le64(val);
793 static inline u64 btrfs_super_generation(struct btrfs_super_block *s)
795 return le64_to_cpu(s->generation);
798 static inline void btrfs_set_super_generation(struct btrfs_super_block *s,
801 s->generation = cpu_to_le64(val);
804 static inline u64 btrfs_super_root(struct btrfs_super_block *s)
806 return le64_to_cpu(s->root);
809 static inline void btrfs_set_super_root(struct btrfs_super_block *s, u64 val)
811 s->root = cpu_to_le64(val);
814 static inline u64 btrfs_super_total_blocks(struct btrfs_super_block *s)
816 return le64_to_cpu(s->total_blocks);
819 static inline void btrfs_set_super_total_blocks(struct btrfs_super_block *s,
822 s->total_blocks = cpu_to_le64(val);
825 static inline u64 btrfs_super_blocks_used(struct btrfs_super_block *s)
827 return le64_to_cpu(s->blocks_used);
830 static inline void btrfs_set_super_blocks_used(struct btrfs_super_block *s,
833 s->blocks_used = cpu_to_le64(val);
836 static inline u32 btrfs_super_blocksize(struct btrfs_super_block *s)
838 return le32_to_cpu(s->blocksize);
841 static inline void btrfs_set_super_blocksize(struct btrfs_super_block *s,
844 s->blocksize = cpu_to_le32(val);
847 static inline u64 btrfs_super_root_dir(struct btrfs_super_block *s)
849 return le64_to_cpu(s->root_dir_objectid);
852 static inline void btrfs_set_super_root_dir(struct btrfs_super_block *s, u64
855 s->root_dir_objectid = cpu_to_le64(val);
858 static inline u64 btrfs_super_last_device_id(struct btrfs_super_block *s)
860 return le64_to_cpu(s->last_device_id);
863 static inline void btrfs_set_super_last_device_id(struct btrfs_super_block *s,
866 s->last_device_id = cpu_to_le64(val);
869 static inline u64 btrfs_super_device_id(struct btrfs_super_block *s)
871 return le64_to_cpu(s->device_id);
874 static inline void btrfs_set_super_device_id(struct btrfs_super_block *s,
877 s->device_id = cpu_to_le64(val);
880 static inline u64 btrfs_super_device_block_start(struct btrfs_super_block *s)
882 return le64_to_cpu(s->device_block_start);
885 static inline void btrfs_set_super_device_block_start(struct btrfs_super_block
888 s->device_block_start = cpu_to_le64(val);
891 static inline u64 btrfs_super_device_num_blocks(struct btrfs_super_block *s)
893 return le64_to_cpu(s->device_num_blocks);
896 static inline void btrfs_set_super_device_num_blocks(struct btrfs_super_block
899 s->device_num_blocks = cpu_to_le64(val);
902 static inline u64 btrfs_super_device_root(struct btrfs_super_block *s)
904 return le64_to_cpu(s->device_root);
907 static inline void btrfs_set_super_device_root(struct btrfs_super_block
910 s->device_root = cpu_to_le64(val);
914 static inline u8 *btrfs_leaf_data(struct btrfs_leaf *l)
916 return (u8 *)l->items;
919 static inline int btrfs_file_extent_type(struct btrfs_file_extent_item *e)
923 static inline void btrfs_set_file_extent_type(struct btrfs_file_extent_item *e,
929 static inline char *btrfs_file_extent_inline_start(struct
930 btrfs_file_extent_item *e)
932 return (char *)(&e->disk_blocknr);
935 static inline u32 btrfs_file_extent_calc_inline_size(u32 datasize)
937 return (unsigned long)(&((struct
938 btrfs_file_extent_item *)NULL)->disk_blocknr) + datasize;
941 static inline u32 btrfs_file_extent_inline_len(struct btrfs_item *e)
943 struct btrfs_file_extent_item *fe = NULL;
944 return btrfs_item_size(e) - (unsigned long)(&fe->disk_blocknr);
947 static inline u64 btrfs_file_extent_disk_blocknr(struct btrfs_file_extent_item
950 return le64_to_cpu(e->disk_blocknr);
953 static inline void btrfs_set_file_extent_disk_blocknr(struct
954 btrfs_file_extent_item
957 e->disk_blocknr = cpu_to_le64(val);
960 static inline u64 btrfs_file_extent_generation(struct btrfs_file_extent_item *e)
962 return le64_to_cpu(e->generation);
965 static inline void btrfs_set_file_extent_generation(struct
966 btrfs_file_extent_item *e,
969 e->generation = cpu_to_le64(val);
972 static inline u64 btrfs_file_extent_disk_num_blocks(struct
973 btrfs_file_extent_item *e)
975 return le64_to_cpu(e->disk_num_blocks);
978 static inline void btrfs_set_file_extent_disk_num_blocks(struct
979 btrfs_file_extent_item
982 e->disk_num_blocks = cpu_to_le64(val);
985 static inline u64 btrfs_file_extent_offset(struct btrfs_file_extent_item *e)
987 return le64_to_cpu(e->offset);
990 static inline void btrfs_set_file_extent_offset(struct btrfs_file_extent_item
993 e->offset = cpu_to_le64(val);
996 static inline u64 btrfs_file_extent_num_blocks(struct btrfs_file_extent_item
999 return le64_to_cpu(e->num_blocks);
1002 static inline void btrfs_set_file_extent_num_blocks(struct
1003 btrfs_file_extent_item *e,
1006 e->num_blocks = cpu_to_le64(val);
1009 static inline u16 btrfs_device_pathlen(struct btrfs_device_item *d)
1011 return le16_to_cpu(d->pathlen);
1014 static inline void btrfs_set_device_pathlen(struct btrfs_device_item *d,
1017 d->pathlen = cpu_to_le16(val);
1020 static inline u64 btrfs_device_id(struct btrfs_device_item *d)
1022 return le64_to_cpu(d->device_id);
1025 static inline void btrfs_set_device_id(struct btrfs_device_item *d,
1028 d->device_id = cpu_to_le64(val);
1031 static inline struct btrfs_root *btrfs_sb(struct super_block *sb)
1033 return sb->s_fs_info;
1036 static inline void btrfs_check_bounds(void *vptr, size_t len,
1037 void *vcontainer, size_t container_len)
1040 char *container = vcontainer;
1041 WARN_ON(ptr < container);
1042 WARN_ON(ptr + len > container + container_len);
1045 static inline void btrfs_memcpy(struct btrfs_root *root,
1047 void *dst, const void *src, size_t nr)
1049 btrfs_check_bounds(dst, nr, dst_block, root->fs_info->sb->s_blocksize);
1050 memcpy(dst, src, nr);
1053 static inline void btrfs_memmove(struct btrfs_root *root,
1055 void *dst, void *src, size_t nr)
1057 btrfs_check_bounds(dst, nr, dst_block, root->fs_info->sb->s_blocksize);
1058 memmove(dst, src, nr);
1061 static inline void btrfs_mark_buffer_dirty(struct buffer_head *bh)
1063 WARN_ON(!atomic_read(&bh->b_count));
1064 mark_buffer_dirty(bh);
1067 /* helper function to cast into the data area of the leaf. */
1068 #define btrfs_item_ptr(leaf, slot, type) \
1069 ((type *)(btrfs_leaf_data(leaf) + \
1070 btrfs_item_offset((leaf)->items + (slot))))
1073 struct btrfs_block_group_cache *btrfs_find_block_group(struct btrfs_root *root,
1074 struct btrfs_block_group_cache
1076 int btrfs_inc_root_ref(struct btrfs_trans_handle *trans,
1077 struct btrfs_root *root);
1078 struct buffer_head *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
1079 struct btrfs_root *root, u64 hint);
1080 int btrfs_alloc_extent(struct btrfs_trans_handle *trans,
1081 struct btrfs_root *root, u64 owner,
1082 u64 num_blocks, u64 search_start,
1083 u64 search_end, struct btrfs_key *ins);
1084 int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1085 struct buffer_head *buf);
1086 int btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
1087 *root, u64 blocknr, u64 num_blocks, int pin);
1088 int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans, struct
1090 int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
1091 struct btrfs_root *root,
1092 u64 blocknr, u64 num_blocks);
1093 int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans,
1094 struct btrfs_root *root);
1095 int btrfs_free_block_groups(struct btrfs_fs_info *info);
1096 int btrfs_read_block_groups(struct btrfs_root *root);
1098 int btrfs_extend_item(struct btrfs_trans_handle *trans, struct btrfs_root
1099 *root, struct btrfs_path *path, u32 data_size);
1100 int btrfs_truncate_item(struct btrfs_trans_handle *trans,
1101 struct btrfs_root *root,
1102 struct btrfs_path *path,
1104 int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root
1105 *root, struct btrfs_key *key, struct btrfs_path *p, int
1107 void btrfs_release_path(struct btrfs_root *root, struct btrfs_path *p);
1108 struct btrfs_path *btrfs_alloc_path(void);
1109 void btrfs_free_path(struct btrfs_path *p);
1110 void btrfs_init_path(struct btrfs_path *p);
1111 int btrfs_del_item(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1112 struct btrfs_path *path);
1113 int btrfs_insert_item(struct btrfs_trans_handle *trans, struct btrfs_root
1114 *root, struct btrfs_key *key, void *data, u32 data_size);
1115 int btrfs_insert_empty_item(struct btrfs_trans_handle *trans, struct btrfs_root
1116 *root, struct btrfs_path *path, struct btrfs_key
1117 *cpu_key, u32 data_size);
1118 int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path);
1119 int btrfs_leaf_free_space(struct btrfs_root *root, struct btrfs_leaf *leaf);
1120 int btrfs_drop_snapshot(struct btrfs_trans_handle *trans, struct btrfs_root
1121 *root, struct buffer_head *snap);
1123 int btrfs_del_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1124 struct btrfs_key *key);
1125 int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root
1126 *root, struct btrfs_key *key, struct btrfs_root_item
1128 int btrfs_update_root(struct btrfs_trans_handle *trans, struct btrfs_root
1129 *root, struct btrfs_key *key, struct btrfs_root_item
1131 int btrfs_find_last_root(struct btrfs_root *root, u64 objectid, struct
1132 btrfs_root_item *item, struct btrfs_key *key);
1134 int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
1135 *root, const char *name, int name_len, u64 dir,
1136 struct btrfs_key *location, u8 type);
1137 struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans,
1138 struct btrfs_root *root,
1139 struct btrfs_path *path, u64 dir,
1140 const char *name, int name_len,
1142 struct btrfs_dir_item *
1143 btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans,
1144 struct btrfs_root *root,
1145 struct btrfs_path *path, u64 dir,
1146 u64 objectid, const char *name, int name_len,
1148 struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_root *root,
1149 struct btrfs_path *path,
1150 const char *name, int name_len);
1151 int btrfs_delete_one_dir_name(struct btrfs_trans_handle *trans,
1152 struct btrfs_root *root,
1153 struct btrfs_path *path,
1154 struct btrfs_dir_item *di);
1156 int btrfs_find_free_objectid(struct btrfs_trans_handle *trans,
1157 struct btrfs_root *fs_root,
1158 u64 dirid, u64 *objectid);
1159 int btrfs_find_highest_inode(struct btrfs_root *fs_root, u64 *objectid);
1162 int btrfs_insert_inode(struct btrfs_trans_handle *trans, struct btrfs_root
1163 *root, u64 objectid, struct btrfs_inode_item
1165 int btrfs_lookup_inode(struct btrfs_trans_handle *trans, struct btrfs_root
1166 *root, struct btrfs_path *path,
1167 struct btrfs_key *location, int mod);
1170 int btrfs_insert_file_extent(struct btrfs_trans_handle *trans,
1171 struct btrfs_root *root,
1172 u64 objectid, u64 pos, u64 offset,
1174 int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
1175 struct btrfs_root *root,
1176 struct btrfs_path *path, u64 objectid,
1177 u64 blocknr, int mod);
1178 int btrfs_csum_file_block(struct btrfs_trans_handle *trans,
1179 struct btrfs_root *root,
1180 u64 objectid, u64 offset,
1181 char *data, size_t len);
1182 int btrfs_csum_verify_file_block(struct btrfs_root *root,
1183 u64 objectid, u64 offset,
1184 char *data, size_t len);
1185 struct btrfs_csum_item *btrfs_lookup_csum(struct btrfs_trans_handle *trans,
1186 struct btrfs_root *root,
1187 struct btrfs_path *path,
1188 u64 objectid, u64 offset,
1191 extern struct subsystem btrfs_subsys;