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 u8 csum[BTRFS_CSUM_SIZE];
231 } __attribute__ ((__packed__));
233 struct btrfs_device_item {
236 } __attribute__ ((__packed__));
239 struct btrfs_fs_info {
240 struct btrfs_root *extent_root;
241 struct btrfs_root *tree_root;
242 struct btrfs_root *dev_root;
243 struct btrfs_key current_insert;
244 struct btrfs_key last_insert;
245 struct radix_tree_root fs_roots_radix;
246 struct radix_tree_root pending_del_radix;
247 struct radix_tree_root pinned_radix;
248 struct radix_tree_root dev_radix;
250 struct btrfs_transaction *running_transaction;
251 struct btrfs_super_block *disk_super;
252 struct buffer_head *sb_buffer;
253 struct super_block *sb;
254 struct inode *btree_inode;
255 struct mutex trans_mutex;
256 struct mutex fs_mutex;
257 struct crypto_hash *hash_tfm;
258 spinlock_t hash_lock;
263 * in ram representation of the tree. extent_root is used for all allocations
264 * and for the extent tree extent_root root. current_insert is used
265 * only for the extent tree.
268 struct buffer_head *node;
269 struct buffer_head *commit_root;
270 struct btrfs_root_item root_item;
271 struct btrfs_key root_key;
272 struct btrfs_fs_info *fs_info;
280 u64 last_inode_alloc;
283 /* the lower bits in the key flags defines the item type */
284 #define BTRFS_KEY_TYPE_MAX 256
285 #define BTRFS_KEY_TYPE_MASK (BTRFS_KEY_TYPE_MAX - 1)
287 #define BTRFS_KEY_OVERFLOW_MAX 128
288 #define BTRFS_KEY_OVERFLOW_SHIFT 8
289 #define BTRFS_KEY_OVERFLOW_MASK (0x7FULL << BTRFS_KEY_OVERFLOW_SHIFT)
292 * inode items have the data typically returned from stat and store other
293 * info about object characteristics. There is one for every file and dir in
296 #define BTRFS_INODE_ITEM_KEY 1
299 * dir items are the name -> inode pointers in a directory. There is one
300 * for every name in a directory.
302 #define BTRFS_DIR_ITEM_KEY 2
303 #define BTRFS_DIR_INDEX_KEY 3
305 * inline data is file data that fits in the btree.
307 #define BTRFS_INLINE_DATA_KEY 4
309 * extent data is for data that can't fit in the btree. It points to
310 * a (hopefully) huge chunk of disk
312 #define BTRFS_EXTENT_DATA_KEY 5
314 * csum items have the checksums for data in the extents
316 #define BTRFS_CSUM_ITEM_KEY 6
319 * root items point to tree roots. There are typically in the root
320 * tree used by the super block to find all the other trees
322 #define BTRFS_ROOT_ITEM_KEY 7
324 * extent items are in the extent map tree. These record which blocks
325 * are used, and how many references there are to each block
327 #define BTRFS_EXTENT_ITEM_KEY 8
330 * dev items list the devices that make up the FS
332 #define BTRFS_DEV_ITEM_KEY 9
335 * string items are for debugging. They just store a short string of
338 #define BTRFS_STRING_ITEM_KEY 10
340 static inline u64 btrfs_inode_generation(struct btrfs_inode_item *i)
342 return le64_to_cpu(i->generation);
345 static inline void btrfs_set_inode_generation(struct btrfs_inode_item *i,
348 i->generation = cpu_to_le64(val);
351 static inline u64 btrfs_inode_size(struct btrfs_inode_item *i)
353 return le64_to_cpu(i->size);
356 static inline void btrfs_set_inode_size(struct btrfs_inode_item *i, u64 val)
358 i->size = cpu_to_le64(val);
361 static inline u64 btrfs_inode_nblocks(struct btrfs_inode_item *i)
363 return le64_to_cpu(i->nblocks);
366 static inline void btrfs_set_inode_nblocks(struct btrfs_inode_item *i, u64 val)
368 i->nblocks = cpu_to_le64(val);
371 static inline u32 btrfs_inode_nlink(struct btrfs_inode_item *i)
373 return le32_to_cpu(i->nlink);
376 static inline void btrfs_set_inode_nlink(struct btrfs_inode_item *i, u32 val)
378 i->nlink = cpu_to_le32(val);
381 static inline u32 btrfs_inode_uid(struct btrfs_inode_item *i)
383 return le32_to_cpu(i->uid);
386 static inline void btrfs_set_inode_uid(struct btrfs_inode_item *i, u32 val)
388 i->uid = cpu_to_le32(val);
391 static inline u32 btrfs_inode_gid(struct btrfs_inode_item *i)
393 return le32_to_cpu(i->gid);
396 static inline void btrfs_set_inode_gid(struct btrfs_inode_item *i, u32 val)
398 i->gid = cpu_to_le32(val);
401 static inline u32 btrfs_inode_mode(struct btrfs_inode_item *i)
403 return le32_to_cpu(i->mode);
406 static inline void btrfs_set_inode_mode(struct btrfs_inode_item *i, u32 val)
408 i->mode = cpu_to_le32(val);
411 static inline u32 btrfs_inode_rdev(struct btrfs_inode_item *i)
413 return le32_to_cpu(i->rdev);
416 static inline void btrfs_set_inode_rdev(struct btrfs_inode_item *i, u32 val)
418 i->rdev = cpu_to_le32(val);
421 static inline u16 btrfs_inode_flags(struct btrfs_inode_item *i)
423 return le16_to_cpu(i->flags);
426 static inline void btrfs_set_inode_flags(struct btrfs_inode_item *i, u16 val)
428 i->flags = cpu_to_le16(val);
431 static inline u16 btrfs_inode_compat_flags(struct btrfs_inode_item *i)
433 return le16_to_cpu(i->compat_flags);
436 static inline void btrfs_set_inode_compat_flags(struct btrfs_inode_item *i,
439 i->compat_flags = cpu_to_le16(val);
442 static inline u64 btrfs_timespec_sec(struct btrfs_inode_timespec *ts)
444 return le64_to_cpu(ts->sec);
447 static inline void btrfs_set_timespec_sec(struct btrfs_inode_timespec *ts,
450 ts->sec = cpu_to_le64(val);
453 static inline u32 btrfs_timespec_nsec(struct btrfs_inode_timespec *ts)
455 return le32_to_cpu(ts->nsec);
458 static inline void btrfs_set_timespec_nsec(struct btrfs_inode_timespec *ts,
461 ts->nsec = cpu_to_le32(val);
464 static inline u32 btrfs_extent_refs(struct btrfs_extent_item *ei)
466 return le32_to_cpu(ei->refs);
469 static inline void btrfs_set_extent_refs(struct btrfs_extent_item *ei, u32 val)
471 ei->refs = cpu_to_le32(val);
474 static inline u64 btrfs_node_blockptr(struct btrfs_node *n, int nr)
476 return le64_to_cpu(n->ptrs[nr].blockptr);
479 static inline void btrfs_set_node_blockptr(struct btrfs_node *n, int nr,
482 n->ptrs[nr].blockptr = cpu_to_le64(val);
485 static inline u32 btrfs_item_offset(struct btrfs_item *item)
487 return le32_to_cpu(item->offset);
490 static inline void btrfs_set_item_offset(struct btrfs_item *item, u32 val)
492 item->offset = cpu_to_le32(val);
495 static inline u32 btrfs_item_end(struct btrfs_item *item)
497 return le32_to_cpu(item->offset) + le16_to_cpu(item->size);
500 static inline u16 btrfs_item_size(struct btrfs_item *item)
502 return le16_to_cpu(item->size);
505 static inline void btrfs_set_item_size(struct btrfs_item *item, u16 val)
507 item->size = cpu_to_le16(val);
510 static inline u16 btrfs_dir_flags(struct btrfs_dir_item *d)
512 return le16_to_cpu(d->flags);
515 static inline void btrfs_set_dir_flags(struct btrfs_dir_item *d, u16 val)
517 d->flags = cpu_to_le16(val);
520 static inline u8 btrfs_dir_type(struct btrfs_dir_item *d)
525 static inline void btrfs_set_dir_type(struct btrfs_dir_item *d, u8 val)
530 static inline u16 btrfs_dir_name_len(struct btrfs_dir_item *d)
532 return le16_to_cpu(d->name_len);
535 static inline void btrfs_set_dir_name_len(struct btrfs_dir_item *d, u16 val)
537 d->name_len = cpu_to_le16(val);
540 static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu,
541 struct btrfs_disk_key *disk)
543 cpu->offset = le64_to_cpu(disk->offset);
544 cpu->flags = le32_to_cpu(disk->flags);
545 cpu->objectid = le64_to_cpu(disk->objectid);
548 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk,
549 struct btrfs_key *cpu)
551 disk->offset = cpu_to_le64(cpu->offset);
552 disk->flags = cpu_to_le32(cpu->flags);
553 disk->objectid = cpu_to_le64(cpu->objectid);
556 static inline u64 btrfs_disk_key_objectid(struct btrfs_disk_key *disk)
558 return le64_to_cpu(disk->objectid);
561 static inline void btrfs_set_disk_key_objectid(struct btrfs_disk_key *disk,
564 disk->objectid = cpu_to_le64(val);
567 static inline u64 btrfs_disk_key_offset(struct btrfs_disk_key *disk)
569 return le64_to_cpu(disk->offset);
572 static inline void btrfs_set_disk_key_offset(struct btrfs_disk_key *disk,
575 disk->offset = cpu_to_le64(val);
578 static inline u32 btrfs_disk_key_flags(struct btrfs_disk_key *disk)
580 return le32_to_cpu(disk->flags);
583 static inline void btrfs_set_disk_key_flags(struct btrfs_disk_key *disk,
586 disk->flags = cpu_to_le32(val);
589 static inline u32 btrfs_key_overflow(struct btrfs_key *key)
591 u32 over = key->flags & BTRFS_KEY_OVERFLOW_MASK;
592 return over >> BTRFS_KEY_OVERFLOW_SHIFT;
595 static inline void btrfs_set_key_overflow(struct btrfs_key *key, u32 over)
597 BUG_ON(over >= BTRFS_KEY_OVERFLOW_MAX);
598 over = over << BTRFS_KEY_OVERFLOW_SHIFT;
599 key->flags = (key->flags & ~((u64)BTRFS_KEY_OVERFLOW_MASK)) | over;
602 static inline u32 btrfs_key_type(struct btrfs_key *key)
604 return key->flags & BTRFS_KEY_TYPE_MASK;
607 static inline u32 btrfs_disk_key_type(struct btrfs_disk_key *key)
609 return le32_to_cpu(key->flags) & BTRFS_KEY_TYPE_MASK;
612 static inline void btrfs_set_key_type(struct btrfs_key *key, u32 type)
614 BUG_ON(type >= BTRFS_KEY_TYPE_MAX);
615 key->flags = (key->flags & ~((u64)BTRFS_KEY_TYPE_MASK)) | type;
618 static inline void btrfs_set_disk_key_type(struct btrfs_disk_key *key, u32 type)
620 u32 flags = btrfs_disk_key_flags(key);
621 BUG_ON(type >= BTRFS_KEY_TYPE_MAX);
622 flags = (flags & ~((u64)BTRFS_KEY_TYPE_MASK)) | type;
623 btrfs_set_disk_key_flags(key, flags);
626 static inline u32 btrfs_disk_key_overflow(struct btrfs_disk_key *key)
628 u32 over = le32_to_cpu(key->flags) & BTRFS_KEY_OVERFLOW_MASK;
629 return over >> BTRFS_KEY_OVERFLOW_SHIFT;
632 static inline void btrfs_set_disK_key_overflow(struct btrfs_disk_key *key,
635 u32 flags = btrfs_disk_key_flags(key);
636 BUG_ON(over >= BTRFS_KEY_OVERFLOW_MAX);
637 over = over << BTRFS_KEY_OVERFLOW_SHIFT;
638 flags = (flags & ~((u64)BTRFS_KEY_OVERFLOW_MASK)) | over;
639 btrfs_set_disk_key_flags(key, flags);
642 static inline u64 btrfs_header_blocknr(struct btrfs_header *h)
644 return le64_to_cpu(h->blocknr);
647 static inline void btrfs_set_header_blocknr(struct btrfs_header *h, u64 blocknr)
649 h->blocknr = cpu_to_le64(blocknr);
652 static inline u64 btrfs_header_generation(struct btrfs_header *h)
654 return le64_to_cpu(h->generation);
657 static inline void btrfs_set_header_generation(struct btrfs_header *h,
660 h->generation = cpu_to_le64(val);
663 static inline u16 btrfs_header_nritems(struct btrfs_header *h)
665 return le16_to_cpu(h->nritems);
668 static inline void btrfs_set_header_nritems(struct btrfs_header *h, u16 val)
670 h->nritems = cpu_to_le16(val);
673 static inline u16 btrfs_header_flags(struct btrfs_header *h)
675 return le16_to_cpu(h->flags);
678 static inline void btrfs_set_header_flags(struct btrfs_header *h, u16 val)
680 h->flags = cpu_to_le16(val);
683 static inline int btrfs_header_level(struct btrfs_header *h)
688 static inline void btrfs_set_header_level(struct btrfs_header *h, int level)
690 BUG_ON(level > BTRFS_MAX_LEVEL);
694 static inline int btrfs_is_leaf(struct btrfs_node *n)
696 return (btrfs_header_level(&n->header) == 0);
699 static inline u64 btrfs_root_blocknr(struct btrfs_root_item *item)
701 return le64_to_cpu(item->blocknr);
704 static inline void btrfs_set_root_blocknr(struct btrfs_root_item *item, u64 val)
706 item->blocknr = cpu_to_le64(val);
709 static inline u64 btrfs_root_dirid(struct btrfs_root_item *item)
711 return le64_to_cpu(item->root_dirid);
714 static inline void btrfs_set_root_dirid(struct btrfs_root_item *item, u64 val)
716 item->root_dirid = cpu_to_le64(val);
719 static inline u32 btrfs_root_refs(struct btrfs_root_item *item)
721 return le32_to_cpu(item->refs);
724 static inline void btrfs_set_root_refs(struct btrfs_root_item *item, u32 val)
726 item->refs = cpu_to_le32(val);
729 static inline u64 btrfs_super_blocknr(struct btrfs_super_block *s)
731 return le64_to_cpu(s->blocknr);
734 static inline void btrfs_set_super_blocknr(struct btrfs_super_block *s, u64 val)
736 s->blocknr = cpu_to_le64(val);
739 static inline u64 btrfs_super_generation(struct btrfs_super_block *s)
741 return le64_to_cpu(s->generation);
744 static inline void btrfs_set_super_generation(struct btrfs_super_block *s,
747 s->generation = cpu_to_le64(val);
750 static inline u64 btrfs_super_root(struct btrfs_super_block *s)
752 return le64_to_cpu(s->root);
755 static inline void btrfs_set_super_root(struct btrfs_super_block *s, u64 val)
757 s->root = cpu_to_le64(val);
760 static inline u64 btrfs_super_total_blocks(struct btrfs_super_block *s)
762 return le64_to_cpu(s->total_blocks);
765 static inline void btrfs_set_super_total_blocks(struct btrfs_super_block *s,
768 s->total_blocks = cpu_to_le64(val);
771 static inline u64 btrfs_super_blocks_used(struct btrfs_super_block *s)
773 return le64_to_cpu(s->blocks_used);
776 static inline void btrfs_set_super_blocks_used(struct btrfs_super_block *s,
779 s->blocks_used = cpu_to_le64(val);
782 static inline u32 btrfs_super_blocksize(struct btrfs_super_block *s)
784 return le32_to_cpu(s->blocksize);
787 static inline void btrfs_set_super_blocksize(struct btrfs_super_block *s,
790 s->blocksize = cpu_to_le32(val);
793 static inline u64 btrfs_super_root_dir(struct btrfs_super_block *s)
795 return le64_to_cpu(s->root_dir_objectid);
798 static inline void btrfs_set_super_root_dir(struct btrfs_super_block *s, u64
801 s->root_dir_objectid = cpu_to_le64(val);
804 static inline u64 btrfs_super_last_device_id(struct btrfs_super_block *s)
806 return le64_to_cpu(s->last_device_id);
809 static inline void btrfs_set_super_last_device_id(struct btrfs_super_block *s,
812 s->last_device_id = cpu_to_le64(val);
815 static inline u64 btrfs_super_device_id(struct btrfs_super_block *s)
817 return le64_to_cpu(s->device_id);
820 static inline void btrfs_set_super_device_id(struct btrfs_super_block *s,
823 s->device_id = cpu_to_le64(val);
826 static inline u64 btrfs_super_device_block_start(struct btrfs_super_block *s)
828 return le64_to_cpu(s->device_block_start);
831 static inline void btrfs_set_super_device_block_start(struct btrfs_super_block
834 s->device_block_start = cpu_to_le64(val);
837 static inline u64 btrfs_super_device_num_blocks(struct btrfs_super_block *s)
839 return le64_to_cpu(s->device_num_blocks);
842 static inline void btrfs_set_super_device_num_blocks(struct btrfs_super_block
845 s->device_num_blocks = cpu_to_le64(val);
848 static inline u64 btrfs_super_device_root(struct btrfs_super_block *s)
850 return le64_to_cpu(s->device_root);
853 static inline void btrfs_set_super_device_root(struct btrfs_super_block
856 s->device_root = cpu_to_le64(val);
860 static inline u8 *btrfs_leaf_data(struct btrfs_leaf *l)
862 return (u8 *)l->items;
865 static inline u64 btrfs_file_extent_disk_blocknr(struct btrfs_file_extent_item
868 return le64_to_cpu(e->disk_blocknr);
871 static inline void btrfs_set_file_extent_disk_blocknr(struct
872 btrfs_file_extent_item
875 e->disk_blocknr = cpu_to_le64(val);
878 static inline u64 btrfs_file_extent_generation(struct btrfs_file_extent_item *e)
880 return le64_to_cpu(e->generation);
883 static inline void btrfs_set_file_extent_generation(struct
884 btrfs_file_extent_item *e,
887 e->generation = cpu_to_le64(val);
890 static inline u64 btrfs_file_extent_disk_num_blocks(struct
891 btrfs_file_extent_item *e)
893 return le64_to_cpu(e->disk_num_blocks);
896 static inline void btrfs_set_file_extent_disk_num_blocks(struct
897 btrfs_file_extent_item
900 e->disk_num_blocks = cpu_to_le64(val);
903 static inline u64 btrfs_file_extent_offset(struct btrfs_file_extent_item *e)
905 return le64_to_cpu(e->offset);
908 static inline void btrfs_set_file_extent_offset(struct btrfs_file_extent_item
911 e->offset = cpu_to_le64(val);
914 static inline u64 btrfs_file_extent_num_blocks(struct btrfs_file_extent_item
917 return le64_to_cpu(e->num_blocks);
920 static inline void btrfs_set_file_extent_num_blocks(struct
921 btrfs_file_extent_item *e,
924 e->num_blocks = cpu_to_le64(val);
927 static inline u16 btrfs_device_pathlen(struct btrfs_device_item *d)
929 return le16_to_cpu(d->pathlen);
932 static inline void btrfs_set_device_pathlen(struct btrfs_device_item *d,
935 d->pathlen = cpu_to_le16(val);
938 static inline u64 btrfs_device_id(struct btrfs_device_item *d)
940 return le64_to_cpu(d->device_id);
943 static inline void btrfs_set_device_id(struct btrfs_device_item *d,
946 d->device_id = cpu_to_le64(val);
949 static inline struct btrfs_root *btrfs_sb(struct super_block *sb)
951 return sb->s_fs_info;
954 static inline void btrfs_check_bounds(void *vptr, size_t len,
955 void *vcontainer, size_t container_len)
958 char *container = vcontainer;
959 WARN_ON(ptr < container);
960 WARN_ON(ptr + len > container + container_len);
963 static inline void btrfs_memcpy(struct btrfs_root *root,
965 void *dst, const void *src, size_t nr)
967 btrfs_check_bounds(dst, nr, dst_block, root->fs_info->sb->s_blocksize);
968 memcpy(dst, src, nr);
971 static inline void btrfs_memmove(struct btrfs_root *root,
973 void *dst, void *src, size_t nr)
975 btrfs_check_bounds(dst, nr, dst_block, root->fs_info->sb->s_blocksize);
976 memmove(dst, src, nr);
979 static inline void btrfs_mark_buffer_dirty(struct buffer_head *bh)
981 WARN_ON(!atomic_read(&bh->b_count));
982 mark_buffer_dirty(bh);
985 /* helper function to cast into the data area of the leaf. */
986 #define btrfs_item_ptr(leaf, slot, type) \
987 ((type *)(btrfs_leaf_data(leaf) + \
988 btrfs_item_offset((leaf)->items + (slot))))
991 int btrfs_inc_root_ref(struct btrfs_trans_handle *trans,
992 struct btrfs_root *root);
993 struct buffer_head *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
994 struct btrfs_root *root);
995 int btrfs_alloc_extent(struct btrfs_trans_handle *trans, struct btrfs_root
996 *root, u64 num_blocks, u64 search_start, u64
997 search_end, struct btrfs_key *ins);
998 int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
999 struct buffer_head *buf);
1000 int btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
1001 *root, u64 blocknr, u64 num_blocks, int pin);
1002 int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans, struct
1005 int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root
1006 *root, struct btrfs_key *key, struct btrfs_path *p, int
1008 void btrfs_release_path(struct btrfs_root *root, struct btrfs_path *p);
1009 struct btrfs_path *btrfs_alloc_path(void);
1010 void btrfs_free_path(struct btrfs_path *p);
1011 void btrfs_init_path(struct btrfs_path *p);
1012 int btrfs_del_item(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1013 struct btrfs_path *path);
1014 int btrfs_insert_item(struct btrfs_trans_handle *trans, struct btrfs_root
1015 *root, struct btrfs_key *key, void *data, u32 data_size);
1016 int btrfs_insert_empty_item(struct btrfs_trans_handle *trans, struct btrfs_root
1017 *root, struct btrfs_path *path, struct btrfs_key
1018 *cpu_key, u32 data_size);
1019 int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path);
1020 int btrfs_leaf_free_space(struct btrfs_root *root, struct btrfs_leaf *leaf);
1021 int btrfs_drop_snapshot(struct btrfs_trans_handle *trans, struct btrfs_root
1022 *root, struct buffer_head *snap);
1024 int btrfs_del_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1025 struct btrfs_key *key);
1026 int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root
1027 *root, struct btrfs_key *key, struct btrfs_root_item
1029 int btrfs_update_root(struct btrfs_trans_handle *trans, struct btrfs_root
1030 *root, struct btrfs_key *key, struct btrfs_root_item
1032 int btrfs_find_last_root(struct btrfs_root *root, u64 objectid, struct
1033 btrfs_root_item *item, struct btrfs_key *key);
1035 int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
1036 *root, const char *name, int name_len, u64 dir,
1037 struct btrfs_key *location, u8 type);
1038 int btrfs_lookup_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
1039 *root, struct btrfs_path *path, u64 dir,
1040 const char *name, int name_len, int mod);
1041 int btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans,
1042 struct btrfs_root *root,
1043 struct btrfs_path *path, u64 dir,
1044 u64 objectid, int mod);
1045 int btrfs_match_dir_item_name(struct btrfs_root *root, struct btrfs_path *path,
1046 const char *name, int name_len);
1048 int btrfs_find_free_objectid(struct btrfs_trans_handle *trans,
1049 struct btrfs_root *fs_root,
1050 u64 dirid, u64 *objectid);
1051 int btrfs_find_highest_inode(struct btrfs_root *fs_root, u64 *objectid);
1054 int btrfs_insert_inode(struct btrfs_trans_handle *trans, struct btrfs_root
1055 *root, u64 objectid, struct btrfs_inode_item
1057 int btrfs_lookup_inode(struct btrfs_trans_handle *trans, struct btrfs_root
1058 *root, struct btrfs_path *path,
1059 struct btrfs_key *location, int mod);
1062 int btrfs_alloc_file_extent(struct btrfs_trans_handle *trans,
1063 struct btrfs_root *root,
1064 u64 objectid, u64 offset,
1065 u64 num_blocks, u64 hint_block,
1067 int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
1068 struct btrfs_root *root,
1069 struct btrfs_path *path, u64 objectid,
1070 u64 blocknr, int mod);
1071 int btrfs_csum_file_block(struct btrfs_trans_handle *trans,
1072 struct btrfs_root *root,
1073 u64 objectid, u64 offset,
1074 char *data, size_t len);
1075 int btrfs_csum_verify_file_block(struct btrfs_root *root,
1076 u64 objectid, u64 offset,
1077 char *data, size_t len);
1079 extern struct subsystem btrfs_subsys;