2 * Copyright (C) 2007 Oracle. All rights reserved.
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public
6 * License v2 as published by the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
13 * You should have received a copy of the GNU General Public
14 * License along with this program; if not, write to the
15 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
16 * Boston, MA 021110-1307, USA.
23 #include "kerncompat.h"
24 #include "radix-tree.h"
25 #include "extent-cache.h"
26 #include "extent_map.h"
29 struct btrfs_trans_handle;
30 #define BTRFS_MAGIC "_B2RfS_M"
32 #define BTRFS_MAX_LEVEL 8
33 #define BTRFS_ROOT_TREE_OBJECTID 1ULL
34 #define BTRFS_EXTENT_TREE_OBJECTID 2ULL
35 #define BTRFS_FS_TREE_OBJECTID 3ULL
36 #define BTRFS_ROOT_TREE_DIR_OBJECTID 4ULL
37 #define BTRFS_FIRST_FREE_OBJECTID 256ULL
40 * we can actually store much bigger names, but lets not confuse the rest
43 #define BTRFS_NAME_LEN 255
45 /* 32 bytes in various csum fields */
46 #define BTRFS_CSUM_SIZE 32
47 /* four bytes for CRC32 */
48 #define BTRFS_CRC32_SIZE 4
49 #define BTRFS_EMPTY_DIR_SIZE 0
51 #define BTRFS_FT_UNKNOWN 0
52 #define BTRFS_FT_REG_FILE 1
53 #define BTRFS_FT_DIR 2
54 #define BTRFS_FT_CHRDEV 3
55 #define BTRFS_FT_BLKDEV 4
56 #define BTRFS_FT_FIFO 5
57 #define BTRFS_FT_SOCK 6
58 #define BTRFS_FT_SYMLINK 7
59 #define BTRFS_FT_XATTR 8
60 #define BTRFS_FT_MAX 9
63 * the key defines the order in the tree, and so it also defines (optimal)
64 * block layout. objectid corresonds to the inode number. The flags
65 * tells us things about the object, and is a kind of stream selector.
66 * so for a given inode, keys with flags of 1 might refer to the inode
67 * data, flags of 2 may point to file data in the btree and flags == 3
68 * may point to extents.
70 * offset is the starting byte offset for this key in the stream.
72 * btrfs_disk_key is in disk byte order. struct btrfs_key is always
73 * in cpu native order. Otherwise they are identical and their sizes
74 * should be the same (ie both packed)
76 struct btrfs_disk_key {
80 } __attribute__ ((__packed__));
86 } __attribute__ ((__packed__));
88 #define BTRFS_FSID_SIZE 16
90 * every tree block (leaf or node) starts with this header.
93 u8 csum[BTRFS_CSUM_SIZE];
94 u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
95 __le64 bytenr; /* which block this node is supposed to live in */
101 } __attribute__ ((__packed__));
103 #define BTRFS_NODEPTRS_PER_BLOCK(r) (((r)->nodesize - \
104 sizeof(struct btrfs_header)) / \
105 sizeof(struct btrfs_key_ptr))
106 #define __BTRFS_LEAF_DATA_SIZE(bs) ((bs) - sizeof(struct btrfs_header))
107 #define BTRFS_LEAF_DATA_SIZE(r) (__BTRFS_LEAF_DATA_SIZE(r->leafsize))
108 #define BTRFS_MAX_INLINE_DATA_SIZE(r) (BTRFS_LEAF_DATA_SIZE(r) - \
109 sizeof(struct btrfs_item) - \
110 sizeof(struct btrfs_file_extent_item))
112 * the super block basically lists the main trees of the FS
113 * it currently lacks any block count etc etc
115 struct btrfs_super_block {
116 u8 csum[BTRFS_CSUM_SIZE];
117 /* the first 3 fields must match struct btrfs_header */
118 u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
119 __le64 bytenr; /* this block number */
125 __le64 root_dir_objectid;
131 } __attribute__ ((__packed__));
134 * A leaf is full of items. offset and size tell us where to find
135 * the item in the leaf (relative to the start of the data area)
138 struct btrfs_disk_key key;
141 } __attribute__ ((__packed__));
144 * leaves have an item area and a data area:
145 * [item0, item1....itemN] [free space] [dataN...data1, data0]
147 * The data is separate from the items to get the keys closer together
151 struct btrfs_header header;
152 struct btrfs_item items[];
153 } __attribute__ ((__packed__));
156 * all non-leaf blocks are nodes, they hold only keys and pointers to
159 struct btrfs_key_ptr {
160 struct btrfs_disk_key key;
163 } __attribute__ ((__packed__));
166 struct btrfs_header header;
167 struct btrfs_key_ptr ptrs[];
168 } __attribute__ ((__packed__));
171 * btrfs_paths remember the path taken from the root down to the leaf.
172 * level 0 is always the leaf, and nodes[1...BTRFS_MAX_LEVEL] will point
173 * to any other levels that are present.
175 * The slots array records the index of the item or block pointer
176 * used while walking the tree.
179 struct extent_buffer *nodes[BTRFS_MAX_LEVEL];
180 int slots[BTRFS_MAX_LEVEL];
186 * items in the extent btree are used to record the objectid of the
187 * owner of the block and the number of references
189 struct btrfs_extent_item {
191 } __attribute__ ((__packed__));
193 struct btrfs_extent_ref {
198 } __attribute__ ((__packed__));
200 struct btrfs_inode_ref {
203 } __attribute__ ((__packed__));
205 struct btrfs_inode_timespec {
208 } __attribute__ ((__packed__));
211 * there is no padding here on purpose. If you want to extent the inode,
212 * make a new item type
214 struct btrfs_inode_item {
226 struct btrfs_inode_timespec atime;
227 struct btrfs_inode_timespec ctime;
228 struct btrfs_inode_timespec mtime;
229 struct btrfs_inode_timespec otime;
230 } __attribute__ ((__packed__));
232 struct btrfs_dir_item {
233 struct btrfs_disk_key location;
237 } __attribute__ ((__packed__));
239 struct btrfs_root_item {
240 struct btrfs_inode_item inode;
247 struct btrfs_disk_key drop_progress;
250 } __attribute__ ((__packed__));
252 #define BTRFS_FILE_EXTENT_REG 0
253 #define BTRFS_FILE_EXTENT_INLINE 1
255 struct btrfs_file_extent_item {
259 * disk space consumed by the extent, checksum blocks are included
263 __le64 disk_num_bytes;
265 * the logical offset in file blocks (no csums)
266 * this extent record is for. This allows a file extent to point
267 * into the middle of an existing extent on disk, sharing it
268 * between two snapshots (useful if some bytes in the middle of the
269 * extent have changed
273 * the logical number of file blocks (no csums included)
276 } __attribute__ ((__packed__));
278 struct btrfs_csum_item {
280 } __attribute__ ((__packed__));
282 /* tag for the radix tree of block groups in ram */
283 #define BTRFS_BLOCK_GROUP_SIZE (256 * 1024 * 1024)
285 #define BTRFS_BLOCK_GROUP_DATA 1
286 #define BTRFS_BLOCK_GROUP_MIXED 2
288 struct btrfs_block_group_item {
291 } __attribute__ ((__packed__));
293 struct btrfs_block_group_cache {
294 struct cache_extent cache;
295 struct btrfs_key key;
296 struct btrfs_block_group_item item;
302 struct btrfs_fs_info {
303 u8 fsid[BTRFS_FSID_SIZE];
304 struct btrfs_root *fs_root;
305 struct btrfs_root *extent_root;
306 struct btrfs_root *tree_root;
308 struct extent_map_tree extent_cache;
309 struct extent_map_tree free_space_cache;
310 struct extent_map_tree block_group_cache;
311 struct extent_map_tree pending_tree;
312 struct extent_map_tree pinned_extents;
313 struct extent_map_tree del_pending;
314 struct extent_map_tree pending_del;
315 struct extent_map_tree extent_ins;
318 u64 last_trans_committed;
319 struct btrfs_trans_handle *running_transaction;
320 struct btrfs_super_block super_copy;
321 struct extent_buffer *sb_buffer;
322 struct mutex fs_mutex;
328 * in ram representation of the tree. extent_root is used for all allocations
329 * and for the extent tree extent_root root.
332 struct extent_buffer *node;
333 struct extent_buffer *commit_root;
334 struct btrfs_root_item root_item;
335 struct btrfs_key root_key;
336 struct btrfs_fs_info *fs_info;
340 /* data allocations are done in sectorsize units */
343 /* node allocations are done in nodesize units */
346 /* leaf allocations are done in leafsize units */
349 /* leaf allocations are done in leafsize units */
356 u64 last_inode_alloc;
360 * inode items have the data typically returned from stat and store other
361 * info about object characteristics. There is one for every file and dir in
364 #define BTRFS_INODE_ITEM_KEY 1
365 #define BTRFS_INODE_REF_KEY 2
366 #define BTRFS_XATTR_ITEM_KEY 8
368 /* reserve 3-15 close to the inode for later flexibility */
371 * dir items are the name -> inode pointers in a directory. There is one
372 * for every name in a directory.
374 #define BTRFS_DIR_ITEM_KEY 16
375 #define BTRFS_DIR_INDEX_KEY 17
377 * extent data is for file data
379 #define BTRFS_EXTENT_DATA_KEY 18
381 * csum items have the checksums for data in the extents
383 #define BTRFS_CSUM_ITEM_KEY 19
385 /* reserve 20-31 for other file stuff */
388 * root items point to tree roots. There are typically in the root
389 * tree used by the super block to find all the other trees
391 #define BTRFS_ROOT_ITEM_KEY 32
393 * extent items are in the extent map tree. These record which blocks
394 * are used, and how many references there are to each block
396 #define BTRFS_EXTENT_ITEM_KEY 33
397 #define BTRFS_EXTENT_REF_KEY 34
400 * block groups give us hints into the extent allocation trees. Which
401 * blocks are free etc etc
403 #define BTRFS_BLOCK_GROUP_ITEM_KEY 50
406 * string items are for debugging. They just store a short string of
409 #define BTRFS_STRING_ITEM_KEY 253
412 #define read_eb_member(eb, ptr, type, member, result) ( \
413 read_extent_buffer(eb, (char *)(result), \
414 ((unsigned long)(ptr)) + \
415 offsetof(type, member), \
416 sizeof(((type *)0)->member)))
418 #define write_eb_member(eb, ptr, type, member, result) ( \
419 write_extent_buffer(eb, (char *)(result), \
420 ((unsigned long)(ptr)) + \
421 offsetof(type, member), \
422 sizeof(((type *)0)->member)))
424 #define BTRFS_SETGET_HEADER_FUNCS(name, type, member, bits) \
425 static inline u##bits btrfs_##name(struct extent_buffer *eb) \
427 struct btrfs_header *h = (struct btrfs_header *)eb->data; \
428 return le##bits##_to_cpu(h->member); \
430 static inline void btrfs_set_##name(struct extent_buffer *eb, \
433 struct btrfs_header *h = (struct btrfs_header *)eb->data; \
434 h->member = cpu_to_le##bits(val); \
437 #define BTRFS_SETGET_FUNCS(name, type, member, bits) \
438 static inline u##bits btrfs_##name(struct extent_buffer *eb, \
441 unsigned long offset = (unsigned long)s + \
442 offsetof(type, member); \
443 __le##bits *tmp = (__le##bits *)(eb->data + offset); \
444 return le##bits##_to_cpu(*tmp); \
446 static inline void btrfs_set_##name(struct extent_buffer *eb, \
447 type *s, u##bits val) \
449 unsigned long offset = (unsigned long)s + \
450 offsetof(type, member); \
451 __le##bits *tmp = (__le##bits *)(eb->data + offset); \
452 *tmp = cpu_to_le##bits(val); \
455 #define BTRFS_SETGET_STACK_FUNCS(name, type, member, bits) \
456 static inline u##bits btrfs_##name(type *s) \
458 return le##bits##_to_cpu(s->member); \
460 static inline void btrfs_set_##name(type *s, u##bits val) \
462 s->member = cpu_to_le##bits(val); \
465 /* struct btrfs_block_group_item */
466 BTRFS_SETGET_STACK_FUNCS(block_group_used, struct btrfs_block_group_item,
468 BTRFS_SETGET_FUNCS(disk_block_group_used, struct btrfs_block_group_item,
471 /* struct btrfs_inode_ref */
472 BTRFS_SETGET_FUNCS(inode_ref_name_len, struct btrfs_inode_ref, name_len, 16);
474 /* struct btrfs_inode_item */
475 BTRFS_SETGET_FUNCS(inode_generation, struct btrfs_inode_item, generation, 64);
476 BTRFS_SETGET_FUNCS(inode_size, struct btrfs_inode_item, size, 64);
477 BTRFS_SETGET_FUNCS(inode_nblocks, struct btrfs_inode_item, nblocks, 64);
478 BTRFS_SETGET_FUNCS(inode_block_group, struct btrfs_inode_item, block_group, 64);
479 BTRFS_SETGET_FUNCS(inode_nlink, struct btrfs_inode_item, nlink, 32);
480 BTRFS_SETGET_FUNCS(inode_uid, struct btrfs_inode_item, uid, 32);
481 BTRFS_SETGET_FUNCS(inode_gid, struct btrfs_inode_item, gid, 32);
482 BTRFS_SETGET_FUNCS(inode_mode, struct btrfs_inode_item, mode, 32);
483 BTRFS_SETGET_FUNCS(inode_rdev, struct btrfs_inode_item, rdev, 32);
484 BTRFS_SETGET_FUNCS(inode_flags, struct btrfs_inode_item, flags, 16);
485 BTRFS_SETGET_FUNCS(inode_compat_flags, struct btrfs_inode_item,
488 BTRFS_SETGET_STACK_FUNCS(stack_inode_generation,
489 struct btrfs_inode_item, generation, 64);
490 BTRFS_SETGET_STACK_FUNCS(stack_inode_size,
491 struct btrfs_inode_item, size, 64);
492 BTRFS_SETGET_STACK_FUNCS(stack_inode_nblocks,
493 struct btrfs_inode_item, nblocks, 64);
494 BTRFS_SETGET_STACK_FUNCS(stack_inode_block_group,
495 struct btrfs_inode_item, block_group, 64);
496 BTRFS_SETGET_STACK_FUNCS(stack_inode_nlink,
497 struct btrfs_inode_item, nlink, 32);
498 BTRFS_SETGET_STACK_FUNCS(stack_inode_uid,
499 struct btrfs_inode_item, uid, 32);
500 BTRFS_SETGET_STACK_FUNCS(stack_inode_gid,
501 struct btrfs_inode_item, gid, 32);
502 BTRFS_SETGET_STACK_FUNCS(stack_inode_mode,
503 struct btrfs_inode_item, mode, 32);
504 BTRFS_SETGET_STACK_FUNCS(stack_inode_rdev,
505 struct btrfs_inode_item, rdev, 32);
506 BTRFS_SETGET_STACK_FUNCS(stack_inode_flags,
507 struct btrfs_inode_item, flags, 16);
508 BTRFS_SETGET_STACK_FUNCS(stack_inode_compat_flags,
509 struct btrfs_inode_item, compat_flags, 16);
511 static inline struct btrfs_inode_timespec *
512 btrfs_inode_atime(struct btrfs_inode_item *inode_item)
514 unsigned long ptr = (unsigned long)inode_item;
515 ptr += offsetof(struct btrfs_inode_item, atime);
516 return (struct btrfs_inode_timespec *)ptr;
519 static inline struct btrfs_inode_timespec *
520 btrfs_inode_mtime(struct btrfs_inode_item *inode_item)
522 unsigned long ptr = (unsigned long)inode_item;
523 ptr += offsetof(struct btrfs_inode_item, mtime);
524 return (struct btrfs_inode_timespec *)ptr;
527 static inline struct btrfs_inode_timespec *
528 btrfs_inode_ctime(struct btrfs_inode_item *inode_item)
530 unsigned long ptr = (unsigned long)inode_item;
531 ptr += offsetof(struct btrfs_inode_item, ctime);
532 return (struct btrfs_inode_timespec *)ptr;
535 static inline struct btrfs_inode_timespec *
536 btrfs_inode_otime(struct btrfs_inode_item *inode_item)
538 unsigned long ptr = (unsigned long)inode_item;
539 ptr += offsetof(struct btrfs_inode_item, otime);
540 return (struct btrfs_inode_timespec *)ptr;
543 BTRFS_SETGET_FUNCS(timespec_sec, struct btrfs_inode_timespec, sec, 64);
544 BTRFS_SETGET_FUNCS(timespec_nsec, struct btrfs_inode_timespec, nsec, 32);
545 BTRFS_SETGET_STACK_FUNCS(stack_timespec_sec, struct btrfs_inode_timespec,
547 BTRFS_SETGET_STACK_FUNCS(stack_timespec_nsec, struct btrfs_inode_timespec,
550 /* struct btrfs_extent_item */
551 BTRFS_SETGET_FUNCS(extent_refs, struct btrfs_extent_item, refs, 32);
553 /* struct btrfs_extent_ref */
554 BTRFS_SETGET_FUNCS(ref_root, struct btrfs_extent_ref, root, 64);
555 BTRFS_SETGET_FUNCS(ref_generation, struct btrfs_extent_ref, generation, 64);
556 BTRFS_SETGET_FUNCS(ref_objectid, struct btrfs_extent_ref, objectid, 64);
557 BTRFS_SETGET_FUNCS(ref_offset, struct btrfs_extent_ref, offset, 64);
559 BTRFS_SETGET_STACK_FUNCS(stack_ref_root, struct btrfs_extent_ref, root, 64);
560 BTRFS_SETGET_STACK_FUNCS(stack_ref_generation, struct btrfs_extent_ref,
562 BTRFS_SETGET_STACK_FUNCS(stack_ref_objectid, struct btrfs_extent_ref,
564 BTRFS_SETGET_STACK_FUNCS(stack_ref_offset, struct btrfs_extent_ref, offset, 64);
566 BTRFS_SETGET_STACK_FUNCS(stack_extent_refs, struct btrfs_extent_item,
569 /* struct btrfs_node */
570 BTRFS_SETGET_FUNCS(key_blockptr, struct btrfs_key_ptr, blockptr, 64);
571 BTRFS_SETGET_FUNCS(key_generation, struct btrfs_key_ptr, generation, 64);
573 static inline u64 btrfs_node_blockptr(struct extent_buffer *eb, int nr)
576 ptr = offsetof(struct btrfs_node, ptrs) +
577 sizeof(struct btrfs_key_ptr) * nr;
578 return btrfs_key_blockptr(eb, (struct btrfs_key_ptr *)ptr);
581 static inline void btrfs_set_node_blockptr(struct extent_buffer *eb,
585 ptr = offsetof(struct btrfs_node, ptrs) +
586 sizeof(struct btrfs_key_ptr) * nr;
587 btrfs_set_key_blockptr(eb, (struct btrfs_key_ptr *)ptr, val);
590 static inline u64 btrfs_node_ptr_generation(struct extent_buffer *eb, int nr)
593 ptr = offsetof(struct btrfs_node, ptrs) +
594 sizeof(struct btrfs_key_ptr) * nr;
595 return btrfs_key_generation(eb, (struct btrfs_key_ptr *)ptr);
598 static inline void btrfs_set_node_ptr_generation(struct extent_buffer *eb,
602 ptr = offsetof(struct btrfs_node, ptrs) +
603 sizeof(struct btrfs_key_ptr) * nr;
604 btrfs_set_key_generation(eb, (struct btrfs_key_ptr *)ptr, val);
607 static inline unsigned long btrfs_node_key_ptr_offset(int nr)
609 return offsetof(struct btrfs_node, ptrs) +
610 sizeof(struct btrfs_key_ptr) * nr;
613 static inline void btrfs_node_key(struct extent_buffer *eb,
614 struct btrfs_disk_key *disk_key, int nr)
617 ptr = btrfs_node_key_ptr_offset(nr);
618 read_eb_member(eb, (struct btrfs_key_ptr *)ptr,
619 struct btrfs_key_ptr, key, disk_key);
622 static inline void btrfs_set_node_key(struct extent_buffer *eb,
623 struct btrfs_disk_key *disk_key, int nr)
626 ptr = btrfs_node_key_ptr_offset(nr);
627 write_eb_member(eb, (struct btrfs_key_ptr *)ptr,
628 struct btrfs_key_ptr, key, disk_key);
631 /* struct btrfs_item */
632 BTRFS_SETGET_FUNCS(item_offset, struct btrfs_item, offset, 32);
633 BTRFS_SETGET_FUNCS(item_size, struct btrfs_item, size, 32);
635 static inline unsigned long btrfs_item_nr_offset(int nr)
637 return offsetof(struct btrfs_leaf, items) +
638 sizeof(struct btrfs_item) * nr;
641 static inline struct btrfs_item *btrfs_item_nr(struct extent_buffer *eb,
644 return (struct btrfs_item *)btrfs_item_nr_offset(nr);
647 static inline u32 btrfs_item_end(struct extent_buffer *eb,
648 struct btrfs_item *item)
650 return btrfs_item_offset(eb, item) + btrfs_item_size(eb, item);
653 static inline u32 btrfs_item_end_nr(struct extent_buffer *eb, int nr)
655 return btrfs_item_end(eb, btrfs_item_nr(eb, nr));
658 static inline u32 btrfs_item_offset_nr(struct extent_buffer *eb, int nr)
660 return btrfs_item_offset(eb, btrfs_item_nr(eb, nr));
663 static inline u32 btrfs_item_size_nr(struct extent_buffer *eb, int nr)
665 return btrfs_item_size(eb, btrfs_item_nr(eb, nr));
668 static inline void btrfs_item_key(struct extent_buffer *eb,
669 struct btrfs_disk_key *disk_key, int nr)
671 struct btrfs_item *item = btrfs_item_nr(eb, nr);
672 read_eb_member(eb, item, struct btrfs_item, key, disk_key);
675 static inline void btrfs_set_item_key(struct extent_buffer *eb,
676 struct btrfs_disk_key *disk_key, int nr)
678 struct btrfs_item *item = btrfs_item_nr(eb, nr);
679 write_eb_member(eb, item, struct btrfs_item, key, disk_key);
682 /* struct btrfs_dir_item */
683 BTRFS_SETGET_FUNCS(dir_data_len, struct btrfs_dir_item, data_len, 16);
684 BTRFS_SETGET_FUNCS(dir_type, struct btrfs_dir_item, type, 8);
685 BTRFS_SETGET_FUNCS(dir_name_len, struct btrfs_dir_item, name_len, 16);
687 static inline void btrfs_dir_item_key(struct extent_buffer *eb,
688 struct btrfs_dir_item *item,
689 struct btrfs_disk_key *key)
691 read_eb_member(eb, item, struct btrfs_dir_item, location, key);
694 static inline void btrfs_set_dir_item_key(struct extent_buffer *eb,
695 struct btrfs_dir_item *item,
696 struct btrfs_disk_key *key)
698 write_eb_member(eb, item, struct btrfs_dir_item, location, key);
701 /* struct btrfs_disk_key */
702 BTRFS_SETGET_STACK_FUNCS(disk_key_objectid, struct btrfs_disk_key,
704 BTRFS_SETGET_STACK_FUNCS(disk_key_offset, struct btrfs_disk_key, offset, 64);
705 BTRFS_SETGET_STACK_FUNCS(disk_key_type, struct btrfs_disk_key, type, 8);
707 static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu,
708 struct btrfs_disk_key *disk)
710 cpu->offset = le64_to_cpu(disk->offset);
711 cpu->type = disk->type;
712 cpu->objectid = le64_to_cpu(disk->objectid);
715 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk,
716 struct btrfs_key *cpu)
718 disk->offset = cpu_to_le64(cpu->offset);
719 disk->type = cpu->type;
720 disk->objectid = cpu_to_le64(cpu->objectid);
723 static inline void btrfs_node_key_to_cpu(struct extent_buffer *eb,
724 struct btrfs_key *key, int nr)
726 struct btrfs_disk_key disk_key;
727 btrfs_node_key(eb, &disk_key, nr);
728 btrfs_disk_key_to_cpu(key, &disk_key);
731 static inline void btrfs_item_key_to_cpu(struct extent_buffer *eb,
732 struct btrfs_key *key, int nr)
734 struct btrfs_disk_key disk_key;
735 btrfs_item_key(eb, &disk_key, nr);
736 btrfs_disk_key_to_cpu(key, &disk_key);
739 static inline void btrfs_dir_item_key_to_cpu(struct extent_buffer *eb,
740 struct btrfs_dir_item *item,
741 struct btrfs_key *key)
743 struct btrfs_disk_key disk_key;
744 btrfs_dir_item_key(eb, item, &disk_key);
745 btrfs_disk_key_to_cpu(key, &disk_key);
749 static inline u8 btrfs_key_type(struct btrfs_key *key)
754 static inline void btrfs_set_key_type(struct btrfs_key *key, u8 val)
759 /* struct btrfs_header */
760 BTRFS_SETGET_HEADER_FUNCS(header_bytenr, struct btrfs_header, bytenr, 64);
761 BTRFS_SETGET_HEADER_FUNCS(header_generation, struct btrfs_header,
763 BTRFS_SETGET_HEADER_FUNCS(header_owner, struct btrfs_header, owner, 64);
764 BTRFS_SETGET_HEADER_FUNCS(header_nritems, struct btrfs_header, nritems, 32);
765 BTRFS_SETGET_HEADER_FUNCS(header_flags, struct btrfs_header, flags, 16);
766 BTRFS_SETGET_HEADER_FUNCS(header_level, struct btrfs_header, level, 8);
768 static inline u8 *btrfs_header_fsid(struct extent_buffer *eb)
770 unsigned long ptr = offsetof(struct btrfs_header, fsid);
774 static inline u8 *btrfs_super_fsid(struct extent_buffer *eb)
776 unsigned long ptr = offsetof(struct btrfs_super_block, fsid);
780 static inline u8 *btrfs_header_csum(struct extent_buffer *eb)
782 unsigned long ptr = offsetof(struct btrfs_header, csum);
786 static inline struct btrfs_node *btrfs_buffer_node(struct extent_buffer *eb)
791 static inline struct btrfs_leaf *btrfs_buffer_leaf(struct extent_buffer *eb)
796 static inline struct btrfs_header *btrfs_buffer_header(struct extent_buffer *eb)
801 static inline int btrfs_is_leaf(struct extent_buffer *eb)
803 return (btrfs_header_level(eb) == 0);
806 /* struct btrfs_root_item */
807 BTRFS_SETGET_FUNCS(disk_root_refs, struct btrfs_root_item, refs, 32);
808 BTRFS_SETGET_FUNCS(disk_root_bytenr, struct btrfs_root_item, bytenr, 64);
809 BTRFS_SETGET_FUNCS(disk_root_level, struct btrfs_root_item, level, 8);
811 BTRFS_SETGET_STACK_FUNCS(root_bytenr, struct btrfs_root_item, bytenr, 64);
812 BTRFS_SETGET_STACK_FUNCS(root_level, struct btrfs_root_item, level, 8);
813 BTRFS_SETGET_STACK_FUNCS(root_dirid, struct btrfs_root_item, root_dirid, 64);
814 BTRFS_SETGET_STACK_FUNCS(root_refs, struct btrfs_root_item, refs, 32);
815 BTRFS_SETGET_STACK_FUNCS(root_flags, struct btrfs_root_item, flags, 32);
816 BTRFS_SETGET_STACK_FUNCS(root_used, struct btrfs_root_item, bytes_used, 64);
817 BTRFS_SETGET_STACK_FUNCS(root_limit, struct btrfs_root_item, byte_limit, 64);
819 /* struct btrfs_super_block */
820 BTRFS_SETGET_STACK_FUNCS(super_bytenr, struct btrfs_super_block, bytenr, 64);
821 BTRFS_SETGET_STACK_FUNCS(super_generation, struct btrfs_super_block,
823 BTRFS_SETGET_STACK_FUNCS(super_root, struct btrfs_super_block, root, 64);
824 BTRFS_SETGET_STACK_FUNCS(super_root_level, struct btrfs_super_block,
826 BTRFS_SETGET_STACK_FUNCS(super_total_bytes, struct btrfs_super_block,
828 BTRFS_SETGET_STACK_FUNCS(super_bytes_used, struct btrfs_super_block,
830 BTRFS_SETGET_STACK_FUNCS(super_sectorsize, struct btrfs_super_block,
832 BTRFS_SETGET_STACK_FUNCS(super_nodesize, struct btrfs_super_block,
834 BTRFS_SETGET_STACK_FUNCS(super_leafsize, struct btrfs_super_block,
836 BTRFS_SETGET_STACK_FUNCS(super_stripesize, struct btrfs_super_block,
838 BTRFS_SETGET_STACK_FUNCS(super_root_dir, struct btrfs_super_block,
839 root_dir_objectid, 64);
841 static inline unsigned long btrfs_leaf_data(struct extent_buffer *l)
843 return offsetof(struct btrfs_leaf, items);
846 /* struct btrfs_file_extent_item */
847 BTRFS_SETGET_FUNCS(file_extent_type, struct btrfs_file_extent_item, type, 8);
849 static inline unsigned long btrfs_file_extent_inline_start(struct
850 btrfs_file_extent_item *e)
852 unsigned long offset = (unsigned long)e;
853 offset += offsetof(struct btrfs_file_extent_item, disk_bytenr);
857 static inline u32 btrfs_file_extent_calc_inline_size(u32 datasize)
859 return offsetof(struct btrfs_file_extent_item, disk_bytenr) + datasize;
862 static inline u32 btrfs_file_extent_inline_len(struct extent_buffer *eb,
863 struct btrfs_item *e)
865 unsigned long offset;
866 offset = offsetof(struct btrfs_file_extent_item, disk_bytenr);
867 return btrfs_item_size(eb, e) - offset;
870 BTRFS_SETGET_FUNCS(file_extent_disk_bytenr, struct btrfs_file_extent_item,
872 BTRFS_SETGET_FUNCS(file_extent_generation, struct btrfs_file_extent_item,
874 BTRFS_SETGET_FUNCS(file_extent_disk_num_bytes, struct btrfs_file_extent_item,
876 BTRFS_SETGET_FUNCS(file_extent_offset, struct btrfs_file_extent_item,
878 BTRFS_SETGET_FUNCS(file_extent_num_bytes, struct btrfs_file_extent_item,
881 static inline u32 btrfs_level_size(struct btrfs_root *root, int level) {
883 return root->leafsize;
884 return root->nodesize;
887 /* helper function to cast into the data area of the leaf. */
888 #define btrfs_item_ptr(leaf, slot, type) \
889 ((type *)(btrfs_leaf_data(leaf) + \
890 btrfs_item_offset_nr(leaf, slot)))
892 #define btrfs_item_ptr_offset(leaf, slot) \
893 ((unsigned long)(btrfs_leaf_data(leaf) + \
894 btrfs_item_offset_nr(leaf, slot)))
897 u32 btrfs_count_snapshots_in_path(struct btrfs_root *root,
898 struct btrfs_path *count_path,
900 int btrfs_extent_post_op(struct btrfs_trans_handle *trans,
901 struct btrfs_root *root);
902 int btrfs_copy_pinned(struct btrfs_root *root, struct extent_map_tree *copy);
903 struct btrfs_block_group_cache *btrfs_lookup_block_group(struct
906 struct btrfs_block_group_cache *btrfs_find_block_group(struct btrfs_root *root,
907 struct btrfs_block_group_cache
908 *hint, u64 search_start,
909 int data, int owner);
910 int btrfs_inc_root_ref(struct btrfs_trans_handle *trans,
911 struct btrfs_root *root, u64 owner_objectid);
912 struct extent_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
913 struct btrfs_root *root, u32 size,
915 u64 hint, u64 empty_size);
916 struct extent_buffer *__btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
917 struct btrfs_root *root,
925 int btrfs_grow_extent_tree(struct btrfs_trans_handle *trans,
926 struct btrfs_root *root, u64 new_size);
927 int btrfs_shrink_extent_tree(struct btrfs_root *root, u64 new_size);
928 int btrfs_insert_extent_backref(struct btrfs_trans_handle *trans,
929 struct btrfs_root *root,
930 struct btrfs_path *path, u64 bytenr,
931 u64 root_objectid, u64 ref_generation,
932 u64 owner, u64 owner_offset);
933 int btrfs_alloc_extent(struct btrfs_trans_handle *trans,
934 struct btrfs_root *root,
935 u64 num_bytes, u64 root_objectid, u64 ref_generation,
936 u64 owner, u64 owner_offset,
937 u64 empty_size, u64 hint_byte,
938 u64 search_end, struct btrfs_key *ins, int data);
939 int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
940 struct extent_buffer *buf);
941 int btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
942 *root, u64 bytenr, u64 num_bytes,
943 u64 root_objectid, u64 ref_generation,
944 u64 owner_objectid, u64 owner_offset, int pin);
945 int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans,
946 struct btrfs_root *root,
947 struct extent_map_tree *unpin);
948 int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
949 struct btrfs_root *root,
950 u64 bytenr, u64 num_bytes,
951 u64 root_objectid, u64 ref_generation,
952 u64 owner, u64 owner_offset);
953 int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans,
954 struct btrfs_root *root);
955 int btrfs_free_block_groups(struct btrfs_fs_info *info);
956 int btrfs_read_block_groups(struct btrfs_root *root);
957 int btrfs_make_block_groups(struct btrfs_trans_handle *trans,
958 struct btrfs_root *root);
959 u64 btrfs_hash_extent_ref(u64 root_objectid, u64 ref_generation,
960 u64 owner, u64 owner_offset);
961 int btrfs_update_block_group(struct btrfs_trans_handle *trans,
962 struct btrfs_root *root, u64 bytenr, u64 num,
963 int alloc, int mark_free, int data);
965 int btrfs_comp_keys(struct btrfs_disk_key *disk, struct btrfs_key *k2);
966 int btrfs_cow_block(struct btrfs_trans_handle *trans,
967 struct btrfs_root *root, struct extent_buffer *buf,
968 struct extent_buffer *parent, int parent_slot,
969 struct extent_buffer **cow_ret);
970 int btrfs_copy_root(struct btrfs_trans_handle *trans,
971 struct btrfs_root *root,
972 struct extent_buffer *buf,
973 struct extent_buffer **cow_ret, u64 new_root_objectid);
974 int btrfs_extend_item(struct btrfs_trans_handle *trans, struct btrfs_root
975 *root, struct btrfs_path *path, u32 data_size);
976 int btrfs_truncate_item(struct btrfs_trans_handle *trans,
977 struct btrfs_root *root,
978 struct btrfs_path *path,
979 u32 new_size, int from_end);
980 int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root
981 *root, struct btrfs_key *key, struct btrfs_path *p, int
983 int btrfs_realloc_node(struct btrfs_trans_handle *trans,
984 struct btrfs_root *root, struct extent_buffer *parent,
985 int start_slot, int cache_only, u64 *last_ret,
986 struct btrfs_key *progress);
987 void btrfs_release_path(struct btrfs_root *root, struct btrfs_path *p);
988 struct btrfs_path *btrfs_alloc_path(void);
989 void btrfs_free_path(struct btrfs_path *p);
990 void btrfs_init_path(struct btrfs_path *p);
991 int btrfs_del_item(struct btrfs_trans_handle *trans, struct btrfs_root *root,
992 struct btrfs_path *path);
993 int btrfs_insert_item(struct btrfs_trans_handle *trans, struct btrfs_root
994 *root, struct btrfs_key *key, void *data, u32 data_size);
995 int btrfs_insert_empty_item(struct btrfs_trans_handle *trans, struct btrfs_root
996 *root, struct btrfs_path *path, struct btrfs_key
997 *cpu_key, u32 data_size);
998 int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path);
999 int btrfs_prev_leaf(struct btrfs_root *root, struct btrfs_path *path);
1000 int btrfs_leaf_free_space(struct btrfs_root *root, struct extent_buffer *leaf);
1001 int btrfs_drop_snapshot(struct btrfs_trans_handle *trans, struct btrfs_root
1006 int btrfs_del_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1007 struct btrfs_key *key);
1008 int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root
1009 *root, struct btrfs_key *key, struct btrfs_root_item
1011 int btrfs_update_root(struct btrfs_trans_handle *trans, struct btrfs_root
1012 *root, struct btrfs_key *key, struct btrfs_root_item
1014 int btrfs_find_last_root(struct btrfs_root *root, u64 objectid, struct
1015 btrfs_root_item *item, struct btrfs_key *key);
1016 int btrfs_find_dead_roots(struct btrfs_root *root, u64 objectid,
1017 struct btrfs_root *latest_root);
1019 int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
1020 *root, const char *name, int name_len, u64 dir,
1021 struct btrfs_key *location, u8 type);
1022 struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans,
1023 struct btrfs_root *root,
1024 struct btrfs_path *path, u64 dir,
1025 const char *name, int name_len,
1027 struct btrfs_dir_item *
1028 btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans,
1029 struct btrfs_root *root,
1030 struct btrfs_path *path, u64 dir,
1031 u64 objectid, const char *name, int name_len,
1033 struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_root *root,
1034 struct btrfs_path *path,
1035 const char *name, int name_len);
1036 int btrfs_delete_one_dir_name(struct btrfs_trans_handle *trans,
1037 struct btrfs_root *root,
1038 struct btrfs_path *path,
1039 struct btrfs_dir_item *di);
1040 int btrfs_insert_xattr_item(struct btrfs_trans_handle *trans,
1041 struct btrfs_root *root, const char *name,
1042 u16 name_len, const void *data, u16 data_len,
1044 struct btrfs_dir_item *btrfs_lookup_xattr(struct btrfs_trans_handle *trans,
1045 struct btrfs_root *root,
1046 struct btrfs_path *path, u64 dir,
1047 const char *name, u16 name_len,
1050 int btrfs_find_free_objectid(struct btrfs_trans_handle *trans,
1051 struct btrfs_root *fs_root,
1052 u64 dirid, u64 *objectid);
1053 int btrfs_find_highest_inode(struct btrfs_root *fs_root, u64 *objectid);
1056 int btrfs_insert_inode_ref(struct btrfs_trans_handle *trans,
1057 struct btrfs_root *root,
1058 const char *name, int name_len,
1059 u64 inode_objectid, u64 ref_objectid);
1060 int btrfs_del_inode_ref(struct btrfs_trans_handle *trans,
1061 struct btrfs_root *root,
1062 const char *name, int name_len,
1063 u64 inode_objectid, u64 ref_objectid);
1064 int btrfs_insert_empty_inode(struct btrfs_trans_handle *trans,
1065 struct btrfs_root *root,
1066 struct btrfs_path *path, u64 objectid);
1067 int btrfs_insert_inode(struct btrfs_trans_handle *trans, struct btrfs_root
1068 *root, u64 objectid, struct btrfs_inode_item
1070 int btrfs_lookup_inode(struct btrfs_trans_handle *trans, struct btrfs_root
1071 *root, struct btrfs_path *path,
1072 struct btrfs_key *location, int mod);
1075 int btrfs_insert_file_extent(struct btrfs_trans_handle *trans,
1076 struct btrfs_root *root,
1077 u64 objectid, u64 pos, u64 offset,
1080 int btrfs_insert_inline_extent(struct btrfs_trans_handle *trans,
1081 struct btrfs_root *root, u64 objectid,
1082 u64 offset, char *buffer, size_t size);
1083 int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
1084 struct btrfs_root *root,
1085 struct btrfs_path *path, u64 objectid,
1086 u64 bytenr, int mod);
1087 int btrfs_csum_file_block(struct btrfs_trans_handle *trans,
1088 struct btrfs_root *root,
1089 struct btrfs_inode_item *inode,
1090 u64 objectid, u64 offset,
1091 char *data, size_t len);
1092 struct btrfs_csum_item *btrfs_lookup_csum(struct btrfs_trans_handle *trans,
1093 struct btrfs_root *root,
1094 struct btrfs_path *path,
1095 u64 objectid, u64 offset,
1097 int btrfs_csum_truncate(struct btrfs_trans_handle *trans,
1098 struct btrfs_root *root, struct btrfs_path *path,