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 */
68 } __attribute__ ((__packed__));
70 #define BTRFS_MAX_LEVEL 8
71 #define BTRFS_NODEPTRS_PER_BLOCK(r) (((r)->blocksize - \
72 sizeof(struct btrfs_header)) / \
73 (sizeof(struct btrfs_disk_key) + sizeof(u64)))
74 #define __BTRFS_LEAF_DATA_SIZE(bs) ((bs) - sizeof(struct btrfs_header))
75 #define BTRFS_LEAF_DATA_SIZE(r) (__BTRFS_LEAF_DATA_SIZE(r->blocksize))
79 * the super block basically lists the main trees of the FS
80 * it currently lacks any block count etc etc
82 struct btrfs_super_block {
83 u8 csum[BTRFS_CSUM_SIZE];
84 /* the first 3 fields must match struct btrfs_header */
85 u8 fsid[16]; /* FS specific uuid */
86 __le64 blocknr; /* this block number */
93 __le64 root_dir_objectid;
94 __le64 last_device_id;
95 /* fields below here vary with the underlying disk */
96 __le64 device_block_start;
97 __le64 device_num_blocks;
100 } __attribute__ ((__packed__));
103 * A leaf is full of items. offset and size tell us where to find
104 * the item in the leaf (relative to the start of the data area)
107 struct btrfs_disk_key key;
110 } __attribute__ ((__packed__));
113 * leaves have an item area and a data area:
114 * [item0, item1....itemN] [free space] [dataN...data1, data0]
116 * The data is separate from the items to get the keys closer together
120 struct btrfs_header header;
121 struct btrfs_item items[];
122 } __attribute__ ((__packed__));
125 * all non-leaf blocks are nodes, they hold only keys and pointers to
128 struct btrfs_key_ptr {
129 struct btrfs_disk_key key;
131 } __attribute__ ((__packed__));
134 struct btrfs_header header;
135 struct btrfs_key_ptr ptrs[];
136 } __attribute__ ((__packed__));
139 * btrfs_paths remember the path taken from the root down to the leaf.
140 * level 0 is always the leaf, and nodes[1...BTRFS_MAX_LEVEL] will point
141 * to any other levels that are present.
143 * The slots array records the index of the item or block pointer
144 * used while walking the tree.
147 struct buffer_head *nodes[BTRFS_MAX_LEVEL];
148 int slots[BTRFS_MAX_LEVEL];
152 * items in the extent btree are used to record the objectid of the
153 * owner of the block and the number of references
155 struct btrfs_extent_item {
157 } __attribute__ ((__packed__));
159 struct btrfs_inode_timespec {
162 } __attribute__ ((__packed__));
165 * there is no padding here on purpose. If you want to extent the inode,
166 * make a new item type
168 struct btrfs_inode_item {
179 struct btrfs_inode_timespec atime;
180 struct btrfs_inode_timespec ctime;
181 struct btrfs_inode_timespec mtime;
182 struct btrfs_inode_timespec otime;
183 } __attribute__ ((__packed__));
185 /* inline data is just a blob of bytes */
186 struct btrfs_inline_data_item {
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 struct btrfs_file_extent_item {
210 * disk space consumed by the extent, checksum blocks are included
214 __le64 disk_num_blocks;
216 * the logical offset in file blocks (no csums)
217 * this extent record is for. This allows a file extent to point
218 * into the middle of an existing extent on disk, sharing it
219 * between two snapshots (useful if some bytes in the middle of the
220 * extent have changed
224 * the logical number of file blocks (no csums included)
227 } __attribute__ ((__packed__));
229 struct btrfs_csum_item {
230 __le64 extent_offset;
231 u8 csum[BTRFS_CSUM_SIZE];
232 } __attribute__ ((__packed__));
234 struct btrfs_device_item {
237 } __attribute__ ((__packed__));
240 struct btrfs_fs_info {
241 struct btrfs_root *extent_root;
242 struct btrfs_root *tree_root;
243 struct btrfs_root *dev_root;
244 struct btrfs_key current_insert;
245 struct btrfs_key last_insert;
246 struct radix_tree_root fs_roots_radix;
247 struct radix_tree_root pending_del_radix;
248 struct radix_tree_root pinned_radix;
249 struct radix_tree_root dev_radix;
251 struct btrfs_transaction *running_transaction;
252 struct btrfs_super_block *disk_super;
253 struct buffer_head *sb_buffer;
254 struct super_block *sb;
255 struct inode *btree_inode;
256 struct mutex trans_mutex;
257 struct mutex fs_mutex;
258 struct crypto_hash *hash_tfm;
259 spinlock_t hash_lock;
264 * in ram representation of the tree. extent_root is used for all allocations
265 * and for the extent tree extent_root root. current_insert is used
266 * only for the extent tree.
269 struct buffer_head *node;
270 struct buffer_head *commit_root;
271 struct btrfs_root_item root_item;
272 struct btrfs_key root_key;
273 struct btrfs_fs_info *fs_info;
281 u64 last_inode_alloc;
284 /* the lower bits in the key flags defines the item type */
285 #define BTRFS_KEY_TYPE_MAX 256
286 #define BTRFS_KEY_TYPE_MASK (BTRFS_KEY_TYPE_MAX - 1)
288 #define BTRFS_KEY_OVERFLOW_MAX 128
289 #define BTRFS_KEY_OVERFLOW_SHIFT 8
290 #define BTRFS_KEY_OVERFLOW_MASK (0x7FULL << BTRFS_KEY_OVERFLOW_SHIFT)
293 * inode items have the data typically returned from stat and store other
294 * info about object characteristics. There is one for every file and dir in
297 #define BTRFS_INODE_ITEM_KEY 1
300 * dir items are the name -> inode pointers in a directory. There is one
301 * for every name in a directory.
303 #define BTRFS_DIR_ITEM_KEY 2
304 #define BTRFS_DIR_INDEX_KEY 3
306 * inline data is file data that fits in the btree.
308 #define BTRFS_INLINE_DATA_KEY 4
310 * extent data is for data that can't fit in the btree. It points to
311 * a (hopefully) huge chunk of disk
313 #define BTRFS_EXTENT_DATA_KEY 5
315 * csum items have the checksums for data in the extents
317 #define BTRFS_CSUM_ITEM_KEY 6
320 * root items point to tree roots. There are typically in the root
321 * tree used by the super block to find all the other trees
323 #define BTRFS_ROOT_ITEM_KEY 7
325 * extent items are in the extent map tree. These record which blocks
326 * are used, and how many references there are to each block
328 #define BTRFS_EXTENT_ITEM_KEY 8
331 * dev items list the devices that make up the FS
333 #define BTRFS_DEV_ITEM_KEY 9
336 * string items are for debugging. They just store a short string of
339 #define BTRFS_STRING_ITEM_KEY 10
341 static inline u64 btrfs_inode_generation(struct btrfs_inode_item *i)
343 return le64_to_cpu(i->generation);
346 static inline void btrfs_set_inode_generation(struct btrfs_inode_item *i,
349 i->generation = cpu_to_le64(val);
352 static inline u64 btrfs_inode_size(struct btrfs_inode_item *i)
354 return le64_to_cpu(i->size);
357 static inline void btrfs_set_inode_size(struct btrfs_inode_item *i, u64 val)
359 i->size = cpu_to_le64(val);
362 static inline u64 btrfs_inode_nblocks(struct btrfs_inode_item *i)
364 return le64_to_cpu(i->nblocks);
367 static inline void btrfs_set_inode_nblocks(struct btrfs_inode_item *i, u64 val)
369 i->nblocks = cpu_to_le64(val);
372 static inline u32 btrfs_inode_nlink(struct btrfs_inode_item *i)
374 return le32_to_cpu(i->nlink);
377 static inline void btrfs_set_inode_nlink(struct btrfs_inode_item *i, u32 val)
379 i->nlink = cpu_to_le32(val);
382 static inline u32 btrfs_inode_uid(struct btrfs_inode_item *i)
384 return le32_to_cpu(i->uid);
387 static inline void btrfs_set_inode_uid(struct btrfs_inode_item *i, u32 val)
389 i->uid = cpu_to_le32(val);
392 static inline u32 btrfs_inode_gid(struct btrfs_inode_item *i)
394 return le32_to_cpu(i->gid);
397 static inline void btrfs_set_inode_gid(struct btrfs_inode_item *i, u32 val)
399 i->gid = cpu_to_le32(val);
402 static inline u32 btrfs_inode_mode(struct btrfs_inode_item *i)
404 return le32_to_cpu(i->mode);
407 static inline void btrfs_set_inode_mode(struct btrfs_inode_item *i, u32 val)
409 i->mode = cpu_to_le32(val);
412 static inline u32 btrfs_inode_rdev(struct btrfs_inode_item *i)
414 return le32_to_cpu(i->rdev);
417 static inline void btrfs_set_inode_rdev(struct btrfs_inode_item *i, u32 val)
419 i->rdev = cpu_to_le32(val);
422 static inline u16 btrfs_inode_flags(struct btrfs_inode_item *i)
424 return le16_to_cpu(i->flags);
427 static inline void btrfs_set_inode_flags(struct btrfs_inode_item *i, u16 val)
429 i->flags = cpu_to_le16(val);
432 static inline u16 btrfs_inode_compat_flags(struct btrfs_inode_item *i)
434 return le16_to_cpu(i->compat_flags);
437 static inline void btrfs_set_inode_compat_flags(struct btrfs_inode_item *i,
440 i->compat_flags = cpu_to_le16(val);
443 static inline u64 btrfs_timespec_sec(struct btrfs_inode_timespec *ts)
445 return le64_to_cpu(ts->sec);
448 static inline void btrfs_set_timespec_sec(struct btrfs_inode_timespec *ts,
451 ts->sec = cpu_to_le64(val);
454 static inline u32 btrfs_timespec_nsec(struct btrfs_inode_timespec *ts)
456 return le32_to_cpu(ts->nsec);
459 static inline void btrfs_set_timespec_nsec(struct btrfs_inode_timespec *ts,
462 ts->nsec = cpu_to_le32(val);
465 static inline u32 btrfs_extent_refs(struct btrfs_extent_item *ei)
467 return le32_to_cpu(ei->refs);
470 static inline void btrfs_set_extent_refs(struct btrfs_extent_item *ei, u32 val)
472 ei->refs = cpu_to_le32(val);
475 static inline u64 btrfs_node_blockptr(struct btrfs_node *n, int nr)
477 return le64_to_cpu(n->ptrs[nr].blockptr);
480 static inline void btrfs_set_node_blockptr(struct btrfs_node *n, int nr,
483 n->ptrs[nr].blockptr = cpu_to_le64(val);
486 static inline u32 btrfs_item_offset(struct btrfs_item *item)
488 return le32_to_cpu(item->offset);
491 static inline void btrfs_set_item_offset(struct btrfs_item *item, u32 val)
493 item->offset = cpu_to_le32(val);
496 static inline u32 btrfs_item_end(struct btrfs_item *item)
498 return le32_to_cpu(item->offset) + le16_to_cpu(item->size);
501 static inline u16 btrfs_item_size(struct btrfs_item *item)
503 return le16_to_cpu(item->size);
506 static inline void btrfs_set_item_size(struct btrfs_item *item, u16 val)
508 item->size = cpu_to_le16(val);
511 static inline u16 btrfs_dir_flags(struct btrfs_dir_item *d)
513 return le16_to_cpu(d->flags);
516 static inline void btrfs_set_dir_flags(struct btrfs_dir_item *d, u16 val)
518 d->flags = cpu_to_le16(val);
521 static inline u8 btrfs_dir_type(struct btrfs_dir_item *d)
526 static inline void btrfs_set_dir_type(struct btrfs_dir_item *d, u8 val)
531 static inline u16 btrfs_dir_name_len(struct btrfs_dir_item *d)
533 return le16_to_cpu(d->name_len);
536 static inline void btrfs_set_dir_name_len(struct btrfs_dir_item *d, u16 val)
538 d->name_len = cpu_to_le16(val);
541 static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu,
542 struct btrfs_disk_key *disk)
544 cpu->offset = le64_to_cpu(disk->offset);
545 cpu->flags = le32_to_cpu(disk->flags);
546 cpu->objectid = le64_to_cpu(disk->objectid);
549 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk,
550 struct btrfs_key *cpu)
552 disk->offset = cpu_to_le64(cpu->offset);
553 disk->flags = cpu_to_le32(cpu->flags);
554 disk->objectid = cpu_to_le64(cpu->objectid);
557 static inline u64 btrfs_disk_key_objectid(struct btrfs_disk_key *disk)
559 return le64_to_cpu(disk->objectid);
562 static inline void btrfs_set_disk_key_objectid(struct btrfs_disk_key *disk,
565 disk->objectid = cpu_to_le64(val);
568 static inline u64 btrfs_disk_key_offset(struct btrfs_disk_key *disk)
570 return le64_to_cpu(disk->offset);
573 static inline void btrfs_set_disk_key_offset(struct btrfs_disk_key *disk,
576 disk->offset = cpu_to_le64(val);
579 static inline u32 btrfs_disk_key_flags(struct btrfs_disk_key *disk)
581 return le32_to_cpu(disk->flags);
584 static inline void btrfs_set_disk_key_flags(struct btrfs_disk_key *disk,
587 disk->flags = cpu_to_le32(val);
590 static inline u32 btrfs_key_overflow(struct btrfs_key *key)
592 u32 over = key->flags & BTRFS_KEY_OVERFLOW_MASK;
593 return over >> BTRFS_KEY_OVERFLOW_SHIFT;
596 static inline void btrfs_set_key_overflow(struct btrfs_key *key, u32 over)
598 BUG_ON(over >= BTRFS_KEY_OVERFLOW_MAX);
599 over = over << BTRFS_KEY_OVERFLOW_SHIFT;
600 key->flags = (key->flags & ~((u64)BTRFS_KEY_OVERFLOW_MASK)) | over;
603 static inline u32 btrfs_key_type(struct btrfs_key *key)
605 return key->flags & BTRFS_KEY_TYPE_MASK;
608 static inline u32 btrfs_disk_key_type(struct btrfs_disk_key *key)
610 return le32_to_cpu(key->flags) & BTRFS_KEY_TYPE_MASK;
613 static inline void btrfs_set_key_type(struct btrfs_key *key, u32 type)
615 BUG_ON(type >= BTRFS_KEY_TYPE_MAX);
616 key->flags = (key->flags & ~((u64)BTRFS_KEY_TYPE_MASK)) | type;
619 static inline void btrfs_set_disk_key_type(struct btrfs_disk_key *key, u32 type)
621 u32 flags = btrfs_disk_key_flags(key);
622 BUG_ON(type >= BTRFS_KEY_TYPE_MAX);
623 flags = (flags & ~((u64)BTRFS_KEY_TYPE_MASK)) | type;
624 btrfs_set_disk_key_flags(key, flags);
627 static inline u32 btrfs_disk_key_overflow(struct btrfs_disk_key *key)
629 u32 over = le32_to_cpu(key->flags) & BTRFS_KEY_OVERFLOW_MASK;
630 return over >> BTRFS_KEY_OVERFLOW_SHIFT;
633 static inline void btrfs_set_disK_key_overflow(struct btrfs_disk_key *key,
636 u32 flags = btrfs_disk_key_flags(key);
637 BUG_ON(over >= BTRFS_KEY_OVERFLOW_MAX);
638 over = over << BTRFS_KEY_OVERFLOW_SHIFT;
639 flags = (flags & ~((u64)BTRFS_KEY_OVERFLOW_MASK)) | over;
640 btrfs_set_disk_key_flags(key, flags);
643 static inline u64 btrfs_header_blocknr(struct btrfs_header *h)
645 return le64_to_cpu(h->blocknr);
648 static inline void btrfs_set_header_blocknr(struct btrfs_header *h, u64 blocknr)
650 h->blocknr = cpu_to_le64(blocknr);
653 static inline u64 btrfs_header_generation(struct btrfs_header *h)
655 return le64_to_cpu(h->generation);
658 static inline void btrfs_set_header_generation(struct btrfs_header *h,
661 h->generation = cpu_to_le64(val);
664 static inline u16 btrfs_header_nritems(struct btrfs_header *h)
666 return le16_to_cpu(h->nritems);
669 static inline void btrfs_set_header_nritems(struct btrfs_header *h, u16 val)
671 h->nritems = cpu_to_le16(val);
674 static inline u16 btrfs_header_flags(struct btrfs_header *h)
676 return le16_to_cpu(h->flags);
679 static inline void btrfs_set_header_flags(struct btrfs_header *h, u16 val)
681 h->flags = cpu_to_le16(val);
684 static inline int btrfs_header_level(struct btrfs_header *h)
689 static inline void btrfs_set_header_level(struct btrfs_header *h, int level)
691 BUG_ON(level > BTRFS_MAX_LEVEL);
695 static inline int btrfs_is_leaf(struct btrfs_node *n)
697 return (btrfs_header_level(&n->header) == 0);
700 static inline u64 btrfs_root_blocknr(struct btrfs_root_item *item)
702 return le64_to_cpu(item->blocknr);
705 static inline void btrfs_set_root_blocknr(struct btrfs_root_item *item, u64 val)
707 item->blocknr = cpu_to_le64(val);
710 static inline u64 btrfs_root_dirid(struct btrfs_root_item *item)
712 return le64_to_cpu(item->root_dirid);
715 static inline void btrfs_set_root_dirid(struct btrfs_root_item *item, u64 val)
717 item->root_dirid = cpu_to_le64(val);
720 static inline u32 btrfs_root_refs(struct btrfs_root_item *item)
722 return le32_to_cpu(item->refs);
725 static inline void btrfs_set_root_refs(struct btrfs_root_item *item, u32 val)
727 item->refs = cpu_to_le32(val);
730 static inline u64 btrfs_super_blocknr(struct btrfs_super_block *s)
732 return le64_to_cpu(s->blocknr);
735 static inline void btrfs_set_super_blocknr(struct btrfs_super_block *s, u64 val)
737 s->blocknr = cpu_to_le64(val);
740 static inline u64 btrfs_super_generation(struct btrfs_super_block *s)
742 return le64_to_cpu(s->generation);
745 static inline void btrfs_set_super_generation(struct btrfs_super_block *s,
748 s->generation = cpu_to_le64(val);
751 static inline u64 btrfs_super_root(struct btrfs_super_block *s)
753 return le64_to_cpu(s->root);
756 static inline void btrfs_set_super_root(struct btrfs_super_block *s, u64 val)
758 s->root = cpu_to_le64(val);
761 static inline u64 btrfs_super_total_blocks(struct btrfs_super_block *s)
763 return le64_to_cpu(s->total_blocks);
766 static inline void btrfs_set_super_total_blocks(struct btrfs_super_block *s,
769 s->total_blocks = cpu_to_le64(val);
772 static inline u64 btrfs_super_blocks_used(struct btrfs_super_block *s)
774 return le64_to_cpu(s->blocks_used);
777 static inline void btrfs_set_super_blocks_used(struct btrfs_super_block *s,
780 s->blocks_used = cpu_to_le64(val);
783 static inline u32 btrfs_super_blocksize(struct btrfs_super_block *s)
785 return le32_to_cpu(s->blocksize);
788 static inline void btrfs_set_super_blocksize(struct btrfs_super_block *s,
791 s->blocksize = cpu_to_le32(val);
794 static inline u64 btrfs_super_root_dir(struct btrfs_super_block *s)
796 return le64_to_cpu(s->root_dir_objectid);
799 static inline void btrfs_set_super_root_dir(struct btrfs_super_block *s, u64
802 s->root_dir_objectid = cpu_to_le64(val);
805 static inline u64 btrfs_super_last_device_id(struct btrfs_super_block *s)
807 return le64_to_cpu(s->last_device_id);
810 static inline void btrfs_set_super_last_device_id(struct btrfs_super_block *s,
813 s->last_device_id = cpu_to_le64(val);
816 static inline u64 btrfs_super_device_id(struct btrfs_super_block *s)
818 return le64_to_cpu(s->device_id);
821 static inline void btrfs_set_super_device_id(struct btrfs_super_block *s,
824 s->device_id = cpu_to_le64(val);
827 static inline u64 btrfs_super_device_block_start(struct btrfs_super_block *s)
829 return le64_to_cpu(s->device_block_start);
832 static inline void btrfs_set_super_device_block_start(struct btrfs_super_block
835 s->device_block_start = cpu_to_le64(val);
838 static inline u64 btrfs_super_device_num_blocks(struct btrfs_super_block *s)
840 return le64_to_cpu(s->device_num_blocks);
843 static inline void btrfs_set_super_device_num_blocks(struct btrfs_super_block
846 s->device_num_blocks = cpu_to_le64(val);
849 static inline u64 btrfs_super_device_root(struct btrfs_super_block *s)
851 return le64_to_cpu(s->device_root);
854 static inline void btrfs_set_super_device_root(struct btrfs_super_block
857 s->device_root = cpu_to_le64(val);
861 static inline u8 *btrfs_leaf_data(struct btrfs_leaf *l)
863 return (u8 *)l->items;
866 static inline u64 btrfs_file_extent_disk_blocknr(struct btrfs_file_extent_item
869 return le64_to_cpu(e->disk_blocknr);
872 static inline void btrfs_set_file_extent_disk_blocknr(struct
873 btrfs_file_extent_item
876 e->disk_blocknr = cpu_to_le64(val);
879 static inline u64 btrfs_file_extent_generation(struct btrfs_file_extent_item *e)
881 return le64_to_cpu(e->generation);
884 static inline void btrfs_set_file_extent_generation(struct
885 btrfs_file_extent_item *e,
888 e->generation = cpu_to_le64(val);
891 static inline u64 btrfs_file_extent_disk_num_blocks(struct
892 btrfs_file_extent_item *e)
894 return le64_to_cpu(e->disk_num_blocks);
897 static inline void btrfs_set_file_extent_disk_num_blocks(struct
898 btrfs_file_extent_item
901 e->disk_num_blocks = cpu_to_le64(val);
904 static inline u64 btrfs_file_extent_offset(struct btrfs_file_extent_item *e)
906 return le64_to_cpu(e->offset);
909 static inline void btrfs_set_file_extent_offset(struct btrfs_file_extent_item
912 e->offset = cpu_to_le64(val);
915 static inline u64 btrfs_file_extent_num_blocks(struct btrfs_file_extent_item
918 return le64_to_cpu(e->num_blocks);
921 static inline void btrfs_set_file_extent_num_blocks(struct
922 btrfs_file_extent_item *e,
925 e->num_blocks = cpu_to_le64(val);
928 static inline u64 btrfs_csum_extent_offset(struct btrfs_csum_item *c)
930 return le64_to_cpu(c->extent_offset);
933 static inline void btrfs_set_csum_extent_offset(struct btrfs_csum_item *c,
936 c->extent_offset = cpu_to_le64(val);
939 static inline u16 btrfs_device_pathlen(struct btrfs_device_item *d)
941 return le16_to_cpu(d->pathlen);
944 static inline void btrfs_set_device_pathlen(struct btrfs_device_item *d,
947 d->pathlen = cpu_to_le16(val);
950 static inline u64 btrfs_device_id(struct btrfs_device_item *d)
952 return le64_to_cpu(d->device_id);
955 static inline void btrfs_set_device_id(struct btrfs_device_item *d,
958 d->device_id = cpu_to_le64(val);
961 static inline struct btrfs_root *btrfs_sb(struct super_block *sb)
963 return sb->s_fs_info;
966 static inline void btrfs_check_bounds(void *vptr, size_t len,
967 void *vcontainer, size_t container_len)
970 char *container = vcontainer;
971 WARN_ON(ptr < container);
972 WARN_ON(ptr + len > container + container_len);
975 static inline void btrfs_memcpy(struct btrfs_root *root,
977 void *dst, const void *src, size_t nr)
979 btrfs_check_bounds(dst, nr, dst_block, root->fs_info->sb->s_blocksize);
980 memcpy(dst, src, nr);
983 static inline void btrfs_memmove(struct btrfs_root *root,
985 void *dst, void *src, size_t nr)
987 btrfs_check_bounds(dst, nr, dst_block, root->fs_info->sb->s_blocksize);
988 memmove(dst, src, nr);
991 static inline void btrfs_mark_buffer_dirty(struct buffer_head *bh)
993 WARN_ON(!atomic_read(&bh->b_count));
994 mark_buffer_dirty(bh);
997 /* helper function to cast into the data area of the leaf. */
998 #define btrfs_item_ptr(leaf, slot, type) \
999 ((type *)(btrfs_leaf_data(leaf) + \
1000 btrfs_item_offset((leaf)->items + (slot))))
1003 int btrfs_inc_root_ref(struct btrfs_trans_handle *trans,
1004 struct btrfs_root *root);
1005 struct buffer_head *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
1006 struct btrfs_root *root);
1007 int btrfs_alloc_extent(struct btrfs_trans_handle *trans, struct btrfs_root
1008 *root, u64 num_blocks, u64 search_start, u64
1009 search_end, struct btrfs_key *ins);
1010 int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1011 struct buffer_head *buf);
1012 int btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
1013 *root, u64 blocknr, u64 num_blocks, int pin);
1014 int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans, struct
1016 int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
1017 struct btrfs_root *root,
1018 u64 blocknr, u64 num_blocks);
1020 int btrfs_extend_item(struct btrfs_trans_handle *trans, struct btrfs_root
1021 *root, struct btrfs_path *path, u32 data_size);
1022 int btrfs_truncate_item(struct btrfs_trans_handle *trans,
1023 struct btrfs_root *root,
1024 struct btrfs_path *path,
1026 int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root
1027 *root, struct btrfs_key *key, struct btrfs_path *p, int
1029 void btrfs_release_path(struct btrfs_root *root, struct btrfs_path *p);
1030 struct btrfs_path *btrfs_alloc_path(void);
1031 void btrfs_free_path(struct btrfs_path *p);
1032 void btrfs_init_path(struct btrfs_path *p);
1033 int btrfs_del_item(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1034 struct btrfs_path *path);
1035 int btrfs_insert_item(struct btrfs_trans_handle *trans, struct btrfs_root
1036 *root, struct btrfs_key *key, void *data, u32 data_size);
1037 int btrfs_insert_empty_item(struct btrfs_trans_handle *trans, struct btrfs_root
1038 *root, struct btrfs_path *path, struct btrfs_key
1039 *cpu_key, u32 data_size);
1040 int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path);
1041 int btrfs_leaf_free_space(struct btrfs_root *root, struct btrfs_leaf *leaf);
1042 int btrfs_drop_snapshot(struct btrfs_trans_handle *trans, struct btrfs_root
1043 *root, struct buffer_head *snap);
1045 int btrfs_del_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1046 struct btrfs_key *key);
1047 int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root
1048 *root, struct btrfs_key *key, struct btrfs_root_item
1050 int btrfs_update_root(struct btrfs_trans_handle *trans, struct btrfs_root
1051 *root, struct btrfs_key *key, struct btrfs_root_item
1053 int btrfs_find_last_root(struct btrfs_root *root, u64 objectid, struct
1054 btrfs_root_item *item, struct btrfs_key *key);
1056 int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
1057 *root, const char *name, int name_len, u64 dir,
1058 struct btrfs_key *location, u8 type);
1059 int btrfs_lookup_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
1060 *root, struct btrfs_path *path, u64 dir,
1061 const char *name, int name_len, int mod);
1062 int btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans,
1063 struct btrfs_root *root,
1064 struct btrfs_path *path, u64 dir,
1065 u64 objectid, int mod);
1066 int btrfs_match_dir_item_name(struct btrfs_root *root, struct btrfs_path *path,
1067 const char *name, int name_len);
1069 int btrfs_find_free_objectid(struct btrfs_trans_handle *trans,
1070 struct btrfs_root *fs_root,
1071 u64 dirid, u64 *objectid);
1072 int btrfs_find_highest_inode(struct btrfs_root *fs_root, u64 *objectid);
1075 int btrfs_insert_inode(struct btrfs_trans_handle *trans, struct btrfs_root
1076 *root, u64 objectid, struct btrfs_inode_item
1078 int btrfs_lookup_inode(struct btrfs_trans_handle *trans, struct btrfs_root
1079 *root, struct btrfs_path *path,
1080 struct btrfs_key *location, int mod);
1083 int btrfs_insert_file_extent(struct btrfs_trans_handle *trans,
1084 struct btrfs_root *root,
1085 u64 objectid, u64 pos, u64 offset,
1087 int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
1088 struct btrfs_root *root,
1089 struct btrfs_path *path, u64 objectid,
1090 u64 blocknr, int mod);
1091 int btrfs_csum_file_block(struct btrfs_trans_handle *trans,
1092 struct btrfs_root *root,
1093 u64 objectid, u64 offset,
1095 char *data, size_t len);
1096 int btrfs_csum_verify_file_block(struct btrfs_root *root,
1097 u64 objectid, u64 offset,
1098 char *data, size_t len);
1099 struct btrfs_csum_item *btrfs_lookup_csum(struct btrfs_trans_handle *trans,
1100 struct btrfs_root *root,
1101 struct btrfs_path *path,
1102 u64 objectid, u64 offset,
1105 extern struct subsystem btrfs_subsys;