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];
155 /* values for the type field in btrfs_extent_item */
156 #define BTRFS_EXTENT_TREE 1
157 #define BTRFS_EXTENT_FILE 2
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 {
166 } __attribute__ ((__packed__));
168 struct btrfs_inode_timespec {
171 } __attribute__ ((__packed__));
174 * there is no padding here on purpose. If you want to extent the inode,
175 * make a new item type
177 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__));
247 struct btrfs_fs_info {
248 struct btrfs_root *extent_root;
249 struct btrfs_root *tree_root;
250 struct btrfs_root *dev_root;
251 struct btrfs_key current_insert;
252 struct btrfs_key last_insert;
253 struct radix_tree_root fs_roots_radix;
254 struct radix_tree_root pending_del_radix;
255 struct radix_tree_root pinned_radix;
256 struct radix_tree_root dev_radix;
258 struct btrfs_transaction *running_transaction;
259 struct btrfs_super_block *disk_super;
260 struct buffer_head *sb_buffer;
261 struct super_block *sb;
262 struct inode *btree_inode;
263 struct mutex trans_mutex;
264 struct mutex fs_mutex;
265 struct list_head trans_list;
266 struct crypto_hash *hash_tfm;
267 spinlock_t hash_lock;
273 * in ram representation of the tree. extent_root is used for all allocations
274 * and for the extent tree extent_root root. current_insert is used
275 * only for the extent tree.
278 struct buffer_head *node;
279 struct buffer_head *commit_root;
280 struct btrfs_root_item root_item;
281 struct btrfs_key root_key;
282 struct btrfs_fs_info *fs_info;
290 u64 last_inode_alloc;
293 /* the lower bits in the key flags defines the item type */
294 #define BTRFS_KEY_TYPE_MAX 256
295 #define BTRFS_KEY_TYPE_SHIFT 24
296 #define BTRFS_KEY_TYPE_MASK (((u32)BTRFS_KEY_TYPE_MAX - 1) << \
297 BTRFS_KEY_TYPE_SHIFT)
300 * inode items have the data typically returned from stat and store other
301 * info about object characteristics. There is one for every file and dir in
304 #define BTRFS_INODE_ITEM_KEY 1
307 * dir items are the name -> inode pointers in a directory. There is one
308 * for every name in a directory.
310 #define BTRFS_DIR_ITEM_KEY 2
311 #define BTRFS_DIR_INDEX_KEY 3
313 * inline data is file data that fits in the btree.
315 #define BTRFS_INLINE_DATA_KEY 4
317 * extent data is for data that can't fit in the btree. It points to
318 * a (hopefully) huge chunk of disk
320 #define BTRFS_EXTENT_DATA_KEY 5
322 * csum items have the checksums for data in the extents
324 #define BTRFS_CSUM_ITEM_KEY 6
327 * root items point to tree roots. There are typically in the root
328 * tree used by the super block to find all the other trees
330 #define BTRFS_ROOT_ITEM_KEY 7
332 * extent items are in the extent map tree. These record which blocks
333 * are used, and how many references there are to each block
335 #define BTRFS_EXTENT_ITEM_KEY 8
338 * dev items list the devices that make up the FS
340 #define BTRFS_DEV_ITEM_KEY 9
343 * string items are for debugging. They just store a short string of
346 #define BTRFS_STRING_ITEM_KEY 10
348 static inline u64 btrfs_inode_generation(struct btrfs_inode_item *i)
350 return le64_to_cpu(i->generation);
353 static inline void btrfs_set_inode_generation(struct btrfs_inode_item *i,
356 i->generation = cpu_to_le64(val);
359 static inline u64 btrfs_inode_size(struct btrfs_inode_item *i)
361 return le64_to_cpu(i->size);
364 static inline void btrfs_set_inode_size(struct btrfs_inode_item *i, u64 val)
366 i->size = cpu_to_le64(val);
369 static inline u64 btrfs_inode_nblocks(struct btrfs_inode_item *i)
371 return le64_to_cpu(i->nblocks);
374 static inline void btrfs_set_inode_nblocks(struct btrfs_inode_item *i, u64 val)
376 i->nblocks = cpu_to_le64(val);
379 static inline u32 btrfs_inode_nlink(struct btrfs_inode_item *i)
381 return le32_to_cpu(i->nlink);
384 static inline void btrfs_set_inode_nlink(struct btrfs_inode_item *i, u32 val)
386 i->nlink = cpu_to_le32(val);
389 static inline u32 btrfs_inode_uid(struct btrfs_inode_item *i)
391 return le32_to_cpu(i->uid);
394 static inline void btrfs_set_inode_uid(struct btrfs_inode_item *i, u32 val)
396 i->uid = cpu_to_le32(val);
399 static inline u32 btrfs_inode_gid(struct btrfs_inode_item *i)
401 return le32_to_cpu(i->gid);
404 static inline void btrfs_set_inode_gid(struct btrfs_inode_item *i, u32 val)
406 i->gid = cpu_to_le32(val);
409 static inline u32 btrfs_inode_mode(struct btrfs_inode_item *i)
411 return le32_to_cpu(i->mode);
414 static inline void btrfs_set_inode_mode(struct btrfs_inode_item *i, u32 val)
416 i->mode = cpu_to_le32(val);
419 static inline u32 btrfs_inode_rdev(struct btrfs_inode_item *i)
421 return le32_to_cpu(i->rdev);
424 static inline void btrfs_set_inode_rdev(struct btrfs_inode_item *i, u32 val)
426 i->rdev = cpu_to_le32(val);
429 static inline u16 btrfs_inode_flags(struct btrfs_inode_item *i)
431 return le16_to_cpu(i->flags);
434 static inline void btrfs_set_inode_flags(struct btrfs_inode_item *i, u16 val)
436 i->flags = cpu_to_le16(val);
439 static inline u16 btrfs_inode_compat_flags(struct btrfs_inode_item *i)
441 return le16_to_cpu(i->compat_flags);
444 static inline void btrfs_set_inode_compat_flags(struct btrfs_inode_item *i,
447 i->compat_flags = cpu_to_le16(val);
450 static inline u64 btrfs_timespec_sec(struct btrfs_inode_timespec *ts)
452 return le64_to_cpu(ts->sec);
455 static inline void btrfs_set_timespec_sec(struct btrfs_inode_timespec *ts,
458 ts->sec = cpu_to_le64(val);
461 static inline u32 btrfs_timespec_nsec(struct btrfs_inode_timespec *ts)
463 return le32_to_cpu(ts->nsec);
466 static inline void btrfs_set_timespec_nsec(struct btrfs_inode_timespec *ts,
469 ts->nsec = cpu_to_le32(val);
472 static inline u32 btrfs_extent_refs(struct btrfs_extent_item *ei)
474 return le32_to_cpu(ei->refs);
477 static inline void btrfs_set_extent_refs(struct btrfs_extent_item *ei, u32 val)
479 ei->refs = cpu_to_le32(val);
482 static inline u64 btrfs_extent_owner(struct btrfs_extent_item *ei)
484 return le64_to_cpu(ei->owner);
487 static inline void btrfs_set_extent_owner(struct btrfs_extent_item *ei, u64 val)
489 ei->owner = cpu_to_le64(val);
492 static inline u8 btrfs_extent_type(struct btrfs_extent_item *ei)
497 static inline void btrfs_set_extent_type(struct btrfs_extent_item *ei, u8 val)
502 static inline u64 btrfs_node_blockptr(struct btrfs_node *n, int nr)
504 return le64_to_cpu(n->ptrs[nr].blockptr);
508 static inline void btrfs_set_node_blockptr(struct btrfs_node *n, int nr,
511 n->ptrs[nr].blockptr = cpu_to_le64(val);
514 static inline u32 btrfs_item_offset(struct btrfs_item *item)
516 return le32_to_cpu(item->offset);
519 static inline void btrfs_set_item_offset(struct btrfs_item *item, u32 val)
521 item->offset = cpu_to_le32(val);
524 static inline u32 btrfs_item_end(struct btrfs_item *item)
526 return le32_to_cpu(item->offset) + le16_to_cpu(item->size);
529 static inline u16 btrfs_item_size(struct btrfs_item *item)
531 return le16_to_cpu(item->size);
534 static inline void btrfs_set_item_size(struct btrfs_item *item, u16 val)
536 item->size = cpu_to_le16(val);
539 static inline u16 btrfs_dir_flags(struct btrfs_dir_item *d)
541 return le16_to_cpu(d->flags);
544 static inline void btrfs_set_dir_flags(struct btrfs_dir_item *d, u16 val)
546 d->flags = cpu_to_le16(val);
549 static inline u8 btrfs_dir_type(struct btrfs_dir_item *d)
554 static inline void btrfs_set_dir_type(struct btrfs_dir_item *d, u8 val)
559 static inline u16 btrfs_dir_name_len(struct btrfs_dir_item *d)
561 return le16_to_cpu(d->name_len);
564 static inline void btrfs_set_dir_name_len(struct btrfs_dir_item *d, u16 val)
566 d->name_len = cpu_to_le16(val);
569 static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu,
570 struct btrfs_disk_key *disk)
572 cpu->offset = le64_to_cpu(disk->offset);
573 cpu->flags = le32_to_cpu(disk->flags);
574 cpu->objectid = le64_to_cpu(disk->objectid);
577 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk,
578 struct btrfs_key *cpu)
580 disk->offset = cpu_to_le64(cpu->offset);
581 disk->flags = cpu_to_le32(cpu->flags);
582 disk->objectid = cpu_to_le64(cpu->objectid);
585 static inline u64 btrfs_disk_key_objectid(struct btrfs_disk_key *disk)
587 return le64_to_cpu(disk->objectid);
590 static inline void btrfs_set_disk_key_objectid(struct btrfs_disk_key *disk,
593 disk->objectid = cpu_to_le64(val);
596 static inline u64 btrfs_disk_key_offset(struct btrfs_disk_key *disk)
598 return le64_to_cpu(disk->offset);
601 static inline void btrfs_set_disk_key_offset(struct btrfs_disk_key *disk,
604 disk->offset = cpu_to_le64(val);
607 static inline u32 btrfs_disk_key_flags(struct btrfs_disk_key *disk)
609 return le32_to_cpu(disk->flags);
612 static inline void btrfs_set_disk_key_flags(struct btrfs_disk_key *disk,
615 disk->flags = cpu_to_le32(val);
618 static inline u32 btrfs_disk_key_type(struct btrfs_disk_key *key)
620 return le32_to_cpu(key->flags) >> BTRFS_KEY_TYPE_SHIFT;
623 static inline void btrfs_set_disk_key_type(struct btrfs_disk_key *key,
626 u32 flags = btrfs_disk_key_flags(key);
627 BUG_ON(val >= BTRFS_KEY_TYPE_MAX);
628 val = val << BTRFS_KEY_TYPE_SHIFT;
629 flags = (flags & ~BTRFS_KEY_TYPE_MASK) | val;
630 btrfs_set_disk_key_flags(key, flags);
633 static inline u32 btrfs_key_type(struct btrfs_key *key)
635 return key->flags >> BTRFS_KEY_TYPE_SHIFT;
638 static inline void btrfs_set_key_type(struct btrfs_key *key, u32 val)
640 BUG_ON(val >= BTRFS_KEY_TYPE_MAX);
641 val = val << BTRFS_KEY_TYPE_SHIFT;
642 key->flags = (key->flags & ~(BTRFS_KEY_TYPE_MASK)) | val;
645 static inline u64 btrfs_header_blocknr(struct btrfs_header *h)
647 return le64_to_cpu(h->blocknr);
650 static inline void btrfs_set_header_blocknr(struct btrfs_header *h, u64 blocknr)
652 h->blocknr = cpu_to_le64(blocknr);
655 static inline u64 btrfs_header_generation(struct btrfs_header *h)
657 return le64_to_cpu(h->generation);
660 static inline void btrfs_set_header_generation(struct btrfs_header *h,
663 h->generation = cpu_to_le64(val);
666 static inline u64 btrfs_header_owner(struct btrfs_header *h)
668 return le64_to_cpu(h->owner);
671 static inline void btrfs_set_header_owner(struct btrfs_header *h,
674 h->owner = cpu_to_le64(val);
677 static inline u16 btrfs_header_nritems(struct btrfs_header *h)
679 return le16_to_cpu(h->nritems);
682 static inline void btrfs_set_header_nritems(struct btrfs_header *h, u16 val)
684 h->nritems = cpu_to_le16(val);
687 static inline u16 btrfs_header_flags(struct btrfs_header *h)
689 return le16_to_cpu(h->flags);
692 static inline void btrfs_set_header_flags(struct btrfs_header *h, u16 val)
694 h->flags = cpu_to_le16(val);
697 static inline int btrfs_header_level(struct btrfs_header *h)
702 static inline void btrfs_set_header_level(struct btrfs_header *h, int level)
704 BUG_ON(level > BTRFS_MAX_LEVEL);
708 static inline int btrfs_is_leaf(struct btrfs_node *n)
710 return (btrfs_header_level(&n->header) == 0);
713 static inline u64 btrfs_root_blocknr(struct btrfs_root_item *item)
715 return le64_to_cpu(item->blocknr);
718 static inline void btrfs_set_root_blocknr(struct btrfs_root_item *item, u64 val)
720 item->blocknr = cpu_to_le64(val);
723 static inline u64 btrfs_root_dirid(struct btrfs_root_item *item)
725 return le64_to_cpu(item->root_dirid);
728 static inline void btrfs_set_root_dirid(struct btrfs_root_item *item, u64 val)
730 item->root_dirid = cpu_to_le64(val);
733 static inline u32 btrfs_root_refs(struct btrfs_root_item *item)
735 return le32_to_cpu(item->refs);
738 static inline void btrfs_set_root_refs(struct btrfs_root_item *item, u32 val)
740 item->refs = cpu_to_le32(val);
743 static inline u64 btrfs_super_blocknr(struct btrfs_super_block *s)
745 return le64_to_cpu(s->blocknr);
748 static inline void btrfs_set_super_blocknr(struct btrfs_super_block *s, u64 val)
750 s->blocknr = cpu_to_le64(val);
753 static inline u64 btrfs_super_generation(struct btrfs_super_block *s)
755 return le64_to_cpu(s->generation);
758 static inline void btrfs_set_super_generation(struct btrfs_super_block *s,
761 s->generation = cpu_to_le64(val);
764 static inline u64 btrfs_super_root(struct btrfs_super_block *s)
766 return le64_to_cpu(s->root);
769 static inline void btrfs_set_super_root(struct btrfs_super_block *s, u64 val)
771 s->root = cpu_to_le64(val);
774 static inline u64 btrfs_super_total_blocks(struct btrfs_super_block *s)
776 return le64_to_cpu(s->total_blocks);
779 static inline void btrfs_set_super_total_blocks(struct btrfs_super_block *s,
782 s->total_blocks = cpu_to_le64(val);
785 static inline u64 btrfs_super_blocks_used(struct btrfs_super_block *s)
787 return le64_to_cpu(s->blocks_used);
790 static inline void btrfs_set_super_blocks_used(struct btrfs_super_block *s,
793 s->blocks_used = cpu_to_le64(val);
796 static inline u32 btrfs_super_blocksize(struct btrfs_super_block *s)
798 return le32_to_cpu(s->blocksize);
801 static inline void btrfs_set_super_blocksize(struct btrfs_super_block *s,
804 s->blocksize = cpu_to_le32(val);
807 static inline u64 btrfs_super_root_dir(struct btrfs_super_block *s)
809 return le64_to_cpu(s->root_dir_objectid);
812 static inline void btrfs_set_super_root_dir(struct btrfs_super_block *s, u64
815 s->root_dir_objectid = cpu_to_le64(val);
818 static inline u64 btrfs_super_last_device_id(struct btrfs_super_block *s)
820 return le64_to_cpu(s->last_device_id);
823 static inline void btrfs_set_super_last_device_id(struct btrfs_super_block *s,
826 s->last_device_id = cpu_to_le64(val);
829 static inline u64 btrfs_super_device_id(struct btrfs_super_block *s)
831 return le64_to_cpu(s->device_id);
834 static inline void btrfs_set_super_device_id(struct btrfs_super_block *s,
837 s->device_id = cpu_to_le64(val);
840 static inline u64 btrfs_super_device_block_start(struct btrfs_super_block *s)
842 return le64_to_cpu(s->device_block_start);
845 static inline void btrfs_set_super_device_block_start(struct btrfs_super_block
848 s->device_block_start = cpu_to_le64(val);
851 static inline u64 btrfs_super_device_num_blocks(struct btrfs_super_block *s)
853 return le64_to_cpu(s->device_num_blocks);
856 static inline void btrfs_set_super_device_num_blocks(struct btrfs_super_block
859 s->device_num_blocks = cpu_to_le64(val);
862 static inline u64 btrfs_super_device_root(struct btrfs_super_block *s)
864 return le64_to_cpu(s->device_root);
867 static inline void btrfs_set_super_device_root(struct btrfs_super_block
870 s->device_root = cpu_to_le64(val);
874 static inline u8 *btrfs_leaf_data(struct btrfs_leaf *l)
876 return (u8 *)l->items;
879 static inline int btrfs_file_extent_type(struct btrfs_file_extent_item *e)
883 static inline void btrfs_set_file_extent_type(struct btrfs_file_extent_item *e,
889 static inline char *btrfs_file_extent_inline_start(struct
890 btrfs_file_extent_item *e)
892 return (char *)(&e->disk_blocknr);
895 static inline u32 btrfs_file_extent_calc_inline_size(u32 datasize)
897 return (unsigned long)(&((struct
898 btrfs_file_extent_item *)NULL)->disk_blocknr) + datasize;
901 static inline u32 btrfs_file_extent_inline_len(struct btrfs_item *e)
903 struct btrfs_file_extent_item *fe = NULL;
904 return btrfs_item_size(e) - (unsigned long)(&fe->disk_blocknr);
907 static inline u64 btrfs_file_extent_disk_blocknr(struct btrfs_file_extent_item
910 return le64_to_cpu(e->disk_blocknr);
913 static inline void btrfs_set_file_extent_disk_blocknr(struct
914 btrfs_file_extent_item
917 e->disk_blocknr = cpu_to_le64(val);
920 static inline u64 btrfs_file_extent_generation(struct btrfs_file_extent_item *e)
922 return le64_to_cpu(e->generation);
925 static inline void btrfs_set_file_extent_generation(struct
926 btrfs_file_extent_item *e,
929 e->generation = cpu_to_le64(val);
932 static inline u64 btrfs_file_extent_disk_num_blocks(struct
933 btrfs_file_extent_item *e)
935 return le64_to_cpu(e->disk_num_blocks);
938 static inline void btrfs_set_file_extent_disk_num_blocks(struct
939 btrfs_file_extent_item
942 e->disk_num_blocks = cpu_to_le64(val);
945 static inline u64 btrfs_file_extent_offset(struct btrfs_file_extent_item *e)
947 return le64_to_cpu(e->offset);
950 static inline void btrfs_set_file_extent_offset(struct btrfs_file_extent_item
953 e->offset = cpu_to_le64(val);
956 static inline u64 btrfs_file_extent_num_blocks(struct btrfs_file_extent_item
959 return le64_to_cpu(e->num_blocks);
962 static inline void btrfs_set_file_extent_num_blocks(struct
963 btrfs_file_extent_item *e,
966 e->num_blocks = cpu_to_le64(val);
969 static inline u16 btrfs_device_pathlen(struct btrfs_device_item *d)
971 return le16_to_cpu(d->pathlen);
974 static inline void btrfs_set_device_pathlen(struct btrfs_device_item *d,
977 d->pathlen = cpu_to_le16(val);
980 static inline u64 btrfs_device_id(struct btrfs_device_item *d)
982 return le64_to_cpu(d->device_id);
985 static inline void btrfs_set_device_id(struct btrfs_device_item *d,
988 d->device_id = cpu_to_le64(val);
991 static inline struct btrfs_root *btrfs_sb(struct super_block *sb)
993 return sb->s_fs_info;
996 static inline void btrfs_check_bounds(void *vptr, size_t len,
997 void *vcontainer, size_t container_len)
1000 char *container = vcontainer;
1001 WARN_ON(ptr < container);
1002 WARN_ON(ptr + len > container + container_len);
1005 static inline void btrfs_memcpy(struct btrfs_root *root,
1007 void *dst, const void *src, size_t nr)
1009 btrfs_check_bounds(dst, nr, dst_block, root->fs_info->sb->s_blocksize);
1010 memcpy(dst, src, nr);
1013 static inline void btrfs_memmove(struct btrfs_root *root,
1015 void *dst, void *src, size_t nr)
1017 btrfs_check_bounds(dst, nr, dst_block, root->fs_info->sb->s_blocksize);
1018 memmove(dst, src, nr);
1021 static inline void btrfs_mark_buffer_dirty(struct buffer_head *bh)
1023 WARN_ON(!atomic_read(&bh->b_count));
1024 mark_buffer_dirty(bh);
1027 /* helper function to cast into the data area of the leaf. */
1028 #define btrfs_item_ptr(leaf, slot, type) \
1029 ((type *)(btrfs_leaf_data(leaf) + \
1030 btrfs_item_offset((leaf)->items + (slot))))
1033 int btrfs_inc_root_ref(struct btrfs_trans_handle *trans,
1034 struct btrfs_root *root);
1035 struct buffer_head *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
1036 struct btrfs_root *root);
1037 int btrfs_alloc_extent(struct btrfs_trans_handle *trans,
1038 struct btrfs_root *root, u64 owner,
1039 u8 type, u64 num_blocks, u64 search_start,
1040 u64 search_end, struct btrfs_key *ins);
1041 int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1042 struct buffer_head *buf);
1043 int btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
1044 *root, u64 blocknr, u64 num_blocks, int pin);
1045 int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans, struct
1047 int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
1048 struct btrfs_root *root,
1049 u64 blocknr, u64 num_blocks);
1051 int btrfs_extend_item(struct btrfs_trans_handle *trans, struct btrfs_root
1052 *root, struct btrfs_path *path, u32 data_size);
1053 int btrfs_truncate_item(struct btrfs_trans_handle *trans,
1054 struct btrfs_root *root,
1055 struct btrfs_path *path,
1057 int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root
1058 *root, struct btrfs_key *key, struct btrfs_path *p, int
1060 void btrfs_release_path(struct btrfs_root *root, struct btrfs_path *p);
1061 struct btrfs_path *btrfs_alloc_path(void);
1062 void btrfs_free_path(struct btrfs_path *p);
1063 void btrfs_init_path(struct btrfs_path *p);
1064 int btrfs_del_item(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1065 struct btrfs_path *path);
1066 int btrfs_insert_item(struct btrfs_trans_handle *trans, struct btrfs_root
1067 *root, struct btrfs_key *key, void *data, u32 data_size);
1068 int btrfs_insert_empty_item(struct btrfs_trans_handle *trans, struct btrfs_root
1069 *root, struct btrfs_path *path, struct btrfs_key
1070 *cpu_key, u32 data_size);
1071 int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path);
1072 int btrfs_leaf_free_space(struct btrfs_root *root, struct btrfs_leaf *leaf);
1073 int btrfs_drop_snapshot(struct btrfs_trans_handle *trans, struct btrfs_root
1074 *root, struct buffer_head *snap);
1076 int btrfs_del_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1077 struct btrfs_key *key);
1078 int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root
1079 *root, struct btrfs_key *key, struct btrfs_root_item
1081 int btrfs_update_root(struct btrfs_trans_handle *trans, struct btrfs_root
1082 *root, struct btrfs_key *key, struct btrfs_root_item
1084 int btrfs_find_last_root(struct btrfs_root *root, u64 objectid, struct
1085 btrfs_root_item *item, struct btrfs_key *key);
1087 int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
1088 *root, const char *name, int name_len, u64 dir,
1089 struct btrfs_key *location, u8 type);
1090 struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans,
1091 struct btrfs_root *root,
1092 struct btrfs_path *path, u64 dir,
1093 const char *name, int name_len,
1095 struct btrfs_dir_item *
1096 btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans,
1097 struct btrfs_root *root,
1098 struct btrfs_path *path, u64 dir,
1099 u64 objectid, const char *name, int name_len,
1101 struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_root *root,
1102 struct btrfs_path *path,
1103 const char *name, int name_len);
1104 int btrfs_delete_one_dir_name(struct btrfs_trans_handle *trans,
1105 struct btrfs_root *root,
1106 struct btrfs_path *path,
1107 struct btrfs_dir_item *di);
1109 int btrfs_find_free_objectid(struct btrfs_trans_handle *trans,
1110 struct btrfs_root *fs_root,
1111 u64 dirid, u64 *objectid);
1112 int btrfs_find_highest_inode(struct btrfs_root *fs_root, u64 *objectid);
1115 int btrfs_insert_inode(struct btrfs_trans_handle *trans, struct btrfs_root
1116 *root, u64 objectid, struct btrfs_inode_item
1118 int btrfs_lookup_inode(struct btrfs_trans_handle *trans, struct btrfs_root
1119 *root, struct btrfs_path *path,
1120 struct btrfs_key *location, int mod);
1123 int btrfs_insert_file_extent(struct btrfs_trans_handle *trans,
1124 struct btrfs_root *root,
1125 u64 objectid, u64 pos, u64 offset,
1127 int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
1128 struct btrfs_root *root,
1129 struct btrfs_path *path, u64 objectid,
1130 u64 blocknr, int mod);
1131 int btrfs_csum_file_block(struct btrfs_trans_handle *trans,
1132 struct btrfs_root *root,
1133 u64 objectid, u64 offset,
1134 char *data, size_t len);
1135 int btrfs_csum_verify_file_block(struct btrfs_root *root,
1136 u64 objectid, u64 offset,
1137 char *data, size_t len);
1138 struct btrfs_csum_item *btrfs_lookup_csum(struct btrfs_trans_handle *trans,
1139 struct btrfs_root *root,
1140 struct btrfs_path *path,
1141 u64 objectid, u64 offset,
1144 extern struct subsystem btrfs_subsys;