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 <linux/highmem.h>
25 #include <linux/workqueue.h>
26 #include <linux/completion.h>
27 #include <asm/kmap_types.h>
28 #include "bit-radix.h"
29 #include "extent_map.h"
31 struct btrfs_trans_handle;
32 struct btrfs_transaction;
33 extern struct kmem_cache *btrfs_trans_handle_cachep;
34 extern struct kmem_cache *btrfs_transaction_cachep;
35 extern struct kmem_cache *btrfs_bit_radix_cachep;
36 extern struct kmem_cache *btrfs_path_cachep;
38 #define BTRFS_MAGIC "_B2RfS_M"
40 #define BTRFS_ROOT_TREE_OBJECTID 1ULL
41 #define BTRFS_EXTENT_TREE_OBJECTID 2ULL
42 #define BTRFS_FS_TREE_OBJECTID 3ULL
43 #define BTRFS_ROOT_TREE_DIR_OBJECTID 4ULL
44 #define BTRFS_FIRST_FREE_OBJECTID 5ULL
47 * we can actually store much bigger names, but lets not confuse the rest
50 #define BTRFS_NAME_LEN 255
52 /* 32 bytes in various csum fields */
53 #define BTRFS_CSUM_SIZE 32
54 /* four bytes for CRC32 */
55 #define BTRFS_CRC32_SIZE 4
56 #define BTRFS_EMPTY_DIR_SIZE 6
58 #define BTRFS_FT_UNKNOWN 0
59 #define BTRFS_FT_REG_FILE 1
60 #define BTRFS_FT_DIR 2
61 #define BTRFS_FT_CHRDEV 3
62 #define BTRFS_FT_BLKDEV 4
63 #define BTRFS_FT_FIFO 5
64 #define BTRFS_FT_SOCK 6
65 #define BTRFS_FT_SYMLINK 7
66 #define BTRFS_FT_XATTR 8
67 #define BTRFS_FT_MAX 9
70 * the key defines the order in the tree, and so it also defines (optimal)
71 * block layout. objectid corresonds to the inode number. The flags
72 * tells us things about the object, and is a kind of stream selector.
73 * so for a given inode, keys with flags of 1 might refer to the inode
74 * data, flags of 2 may point to file data in the btree and flags == 3
75 * may point to extents.
77 * offset is the starting byte offset for this key in the stream.
79 * btrfs_disk_key is in disk byte order. struct btrfs_key is always
80 * in cpu native order. Otherwise they are identical and their sizes
81 * should be the same (ie both packed)
83 struct btrfs_disk_key {
87 } __attribute__ ((__packed__));
93 } __attribute__ ((__packed__));
95 #define BTRFS_FSID_SIZE 16
97 * every tree block (leaf or node) starts with this header.
100 u8 csum[BTRFS_CSUM_SIZE];
101 u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
102 __le64 bytenr; /* which block this node is supposed to live in */
108 } __attribute__ ((__packed__));
110 #define BTRFS_MAX_LEVEL 8
111 #define BTRFS_NODEPTRS_PER_BLOCK(r) (((r)->nodesize - \
112 sizeof(struct btrfs_header)) / \
113 (sizeof(struct btrfs_disk_key) + sizeof(u64)))
114 #define __BTRFS_LEAF_DATA_SIZE(bs) ((bs) - sizeof(struct btrfs_header))
115 #define BTRFS_LEAF_DATA_SIZE(r) (__BTRFS_LEAF_DATA_SIZE(r->leafsize))
116 #define BTRFS_MAX_INLINE_DATA_SIZE(r) (BTRFS_LEAF_DATA_SIZE(r) - \
117 sizeof(struct btrfs_item) - \
118 sizeof(struct btrfs_file_extent_item))
121 * the super block basically lists the main trees of the FS
122 * it currently lacks any block count etc etc
124 struct btrfs_super_block {
125 u8 csum[BTRFS_CSUM_SIZE];
126 /* the first 3 fields must match struct btrfs_header */
127 u8 fsid[16]; /* FS specific uuid */
128 __le64 bytenr; /* this block number */
134 __le64 root_dir_objectid;
139 } __attribute__ ((__packed__));
142 * A leaf is full of items. offset and size tell us where to find
143 * the item in the leaf (relative to the start of the data area)
146 struct btrfs_disk_key key;
149 } __attribute__ ((__packed__));
152 * leaves have an item area and a data area:
153 * [item0, item1....itemN] [free space] [dataN...data1, data0]
155 * The data is separate from the items to get the keys closer together
159 struct btrfs_header header;
160 struct btrfs_item items[];
161 } __attribute__ ((__packed__));
164 * all non-leaf blocks are nodes, they hold only keys and pointers to
167 struct btrfs_key_ptr {
168 struct btrfs_disk_key key;
170 } __attribute__ ((__packed__));
173 struct btrfs_header header;
174 struct btrfs_key_ptr ptrs[];
175 } __attribute__ ((__packed__));
178 * btrfs_paths remember the path taken from the root down to the leaf.
179 * level 0 is always the leaf, and nodes[1...BTRFS_MAX_LEVEL] will point
180 * to any other levels that are present.
182 * The slots array records the index of the item or block pointer
183 * used while walking the tree.
186 struct extent_buffer *nodes[BTRFS_MAX_LEVEL];
187 int slots[BTRFS_MAX_LEVEL];
193 * items in the extent btree are used to record the objectid of the
194 * owner of the block and the number of references
196 struct btrfs_extent_item {
199 } __attribute__ ((__packed__));
201 struct btrfs_inode_timespec {
204 } __attribute__ ((__packed__));
207 * there is no padding here on purpose. If you want to extent the inode,
208 * make a new item type
210 struct btrfs_inode_item {
222 struct btrfs_inode_timespec atime;
223 struct btrfs_inode_timespec ctime;
224 struct btrfs_inode_timespec mtime;
225 struct btrfs_inode_timespec otime;
226 } __attribute__ ((__packed__));
228 struct btrfs_dir_item {
229 struct btrfs_disk_key location;
233 } __attribute__ ((__packed__));
235 struct btrfs_root_item {
236 struct btrfs_inode_item inode;
243 struct btrfs_disk_key drop_progress;
246 } __attribute__ ((__packed__));
248 #define BTRFS_FILE_EXTENT_REG 0
249 #define BTRFS_FILE_EXTENT_INLINE 1
251 struct btrfs_file_extent_item {
255 * disk space consumed by the extent, checksum blocks are included
259 __le64 disk_num_bytes;
261 * the logical offset in file blocks (no csums)
262 * this extent record is for. This allows a file extent to point
263 * into the middle of an existing extent on disk, sharing it
264 * between two snapshots (useful if some bytes in the middle of the
265 * extent have changed
269 * the logical number of file blocks (no csums included)
272 } __attribute__ ((__packed__));
274 struct btrfs_csum_item {
276 } __attribute__ ((__packed__));
278 /* tag for the radix tree of block groups in ram */
279 #define BTRFS_BLOCK_GROUP_SIZE (256 * 1024 * 1024)
282 #define BTRFS_BLOCK_GROUP_DATA 1
283 #define BTRFS_BLOCK_GROUP_MIXED 2
285 struct btrfs_block_group_item {
288 } __attribute__ ((__packed__));
290 struct btrfs_block_group_cache {
291 struct btrfs_key key;
292 struct btrfs_block_group_item item;
297 struct btrfs_fs_info {
298 u8 fsid[BTRFS_FSID_SIZE];
299 struct btrfs_root *extent_root;
300 struct btrfs_root *tree_root;
301 struct radix_tree_root fs_roots_radix;
303 struct extent_map_tree free_space_cache;
304 struct extent_map_tree block_group_cache;
305 struct extent_map_tree pinned_extents;
306 struct extent_map_tree pending_del;
307 struct extent_map_tree extent_ins;
310 u64 last_trans_committed;
311 struct btrfs_transaction *running_transaction;
312 struct btrfs_super_block super_copy;
313 struct extent_buffer *sb_buffer;
314 struct super_block *sb;
315 struct inode *btree_inode;
316 spinlock_t hash_lock;
317 struct mutex trans_mutex;
318 struct mutex fs_mutex;
319 struct list_head trans_list;
320 struct list_head hashers;
321 struct list_head dead_roots;
322 struct delayed_work trans_work;
323 struct kobject super_kobj;
324 struct completion kobj_unregister;
331 * in ram representation of the tree. extent_root is used for all allocations
332 * and for the extent tree extent_root root.
335 struct extent_buffer *node;
336 struct extent_buffer *commit_root;
337 struct btrfs_root_item root_item;
338 struct btrfs_key root_key;
339 struct btrfs_fs_info *fs_info;
341 struct kobject root_kobj;
342 struct completion kobj_unregister;
343 struct rw_semaphore snap_sem;
347 /* data allocations are done in sectorsize units */
350 /* node allocations are done in nodesize units */
353 /* leaf allocations are done in leafsize units */
358 u64 last_inode_alloc;
360 struct btrfs_key defrag_progress;
367 * inode items have the data typically returned from stat and store other
368 * info about object characteristics. There is one for every file and dir in
371 #define BTRFS_INODE_ITEM_KEY 1
372 #define BTRFS_XATTR_ITEM_KEY 2
373 /* reserve 2-15 close to the inode for later flexibility */
376 * dir items are the name -> inode pointers in a directory. There is one
377 * for every name in a directory.
379 #define BTRFS_DIR_ITEM_KEY 16
380 #define BTRFS_DIR_INDEX_KEY 17
382 * extent data is for file data
384 #define BTRFS_EXTENT_DATA_KEY 18
386 * csum items have the checksums for data in the extents
388 #define BTRFS_CSUM_ITEM_KEY 19
390 /* reserve 20-31 for other file stuff */
393 * root items point to tree roots. There are typically in the root
394 * tree used by the super block to find all the other trees
396 #define BTRFS_ROOT_ITEM_KEY 32
398 * extent items are in the extent map tree. These record which blocks
399 * are used, and how many references there are to each block
401 #define BTRFS_EXTENT_ITEM_KEY 33
404 * block groups give us hints into the extent allocation trees. Which
405 * blocks are free etc etc
407 #define BTRFS_BLOCK_GROUP_ITEM_KEY 34
410 * string items are for debugging. They just store a short string of
413 #define BTRFS_STRING_ITEM_KEY 253
415 /* some macros to generate set/get funcs for the struct fields. This
416 * assumes there is a lefoo_to_cpu for every type, so lets make a simple
419 #define le8_to_cpu(v) (v)
420 #define cpu_to_le8(v) (v)
423 #define read_eb_member(eb, ptr, type, member, result) ( \
424 read_extent_buffer(eb, (char *)(result), \
425 ((unsigned long)(ptr)) + \
426 offsetof(type, member), \
427 sizeof(((type *)0)->member)))
429 #define write_eb_member(eb, ptr, type, member, result) ( \
430 write_extent_buffer(eb, (char *)(result), \
431 ((unsigned long)(ptr)) + \
432 offsetof(type, member), \
433 sizeof(((type *)0)->member)))
435 #ifndef BTRFS_SETGET_FUNCS
436 #define BTRFS_SETGET_FUNCS(name, type, member, bits) \
437 u##bits btrfs_##name(struct extent_buffer *eb, type *s); \
438 void btrfs_set_##name(struct extent_buffer *eb, type *s, u##bits val);
441 #define BTRFS_SETGET_HEADER_FUNCS(name, type, member, bits) \
442 static inline u##bits btrfs_##name(struct extent_buffer *eb) \
444 char *kaddr = kmap_atomic(eb->first_page, KM_USER0); \
445 unsigned long offset = offsetof(type, member); \
447 __le##bits *tmp = (__le##bits *)(kaddr + offset); \
448 res = le##bits##_to_cpu(*tmp); \
449 kunmap_atomic(kaddr, KM_USER0); \
452 static inline void btrfs_set_##name(struct extent_buffer *eb, \
455 char *kaddr = kmap_atomic(eb->first_page, KM_USER0); \
456 unsigned long offset = offsetof(type, member); \
457 __le##bits *tmp = (__le##bits *)(kaddr + offset); \
458 *tmp = cpu_to_le##bits(val); \
459 kunmap_atomic(kaddr, KM_USER0); \
462 #define BTRFS_SETGET_STACK_FUNCS(name, type, member, bits) \
463 static inline u##bits btrfs_##name(type *s) \
465 return le##bits##_to_cpu(s->member); \
467 static inline void btrfs_set_##name(type *s, u##bits val) \
469 s->member = cpu_to_le##bits(val); \
472 /* struct btrfs_block_group_item */
473 BTRFS_SETGET_STACK_FUNCS(block_group_used, struct btrfs_block_group_item,
475 BTRFS_SETGET_FUNCS(disk_block_group_used, struct btrfs_block_group_item,
478 /* struct btrfs_inode_item */
479 BTRFS_SETGET_FUNCS(inode_generation, struct btrfs_inode_item, generation, 64);
480 BTRFS_SETGET_FUNCS(inode_size, struct btrfs_inode_item, size, 64);
481 BTRFS_SETGET_FUNCS(inode_nblocks, struct btrfs_inode_item, nblocks, 64);
482 BTRFS_SETGET_FUNCS(inode_block_group, struct btrfs_inode_item, block_group, 64);
483 BTRFS_SETGET_FUNCS(inode_nlink, struct btrfs_inode_item, nlink, 32);
484 BTRFS_SETGET_FUNCS(inode_uid, struct btrfs_inode_item, uid, 32);
485 BTRFS_SETGET_FUNCS(inode_gid, struct btrfs_inode_item, gid, 32);
486 BTRFS_SETGET_FUNCS(inode_mode, struct btrfs_inode_item, mode, 32);
487 BTRFS_SETGET_FUNCS(inode_rdev, struct btrfs_inode_item, rdev, 32);
488 BTRFS_SETGET_FUNCS(inode_flags, struct btrfs_inode_item, flags, 16);
489 BTRFS_SETGET_FUNCS(inode_compat_flags, struct btrfs_inode_item,
492 static inline struct btrfs_inode_timespec *
493 btrfs_inode_atime(struct btrfs_inode_item *inode_item)
495 unsigned long ptr = (unsigned long)inode_item;
496 ptr += offsetof(struct btrfs_inode_item, atime);
497 return (struct btrfs_inode_timespec *)ptr;
500 static inline struct btrfs_inode_timespec *
501 btrfs_inode_mtime(struct btrfs_inode_item *inode_item)
503 unsigned long ptr = (unsigned long)inode_item;
504 ptr += offsetof(struct btrfs_inode_item, mtime);
505 return (struct btrfs_inode_timespec *)ptr;
508 static inline struct btrfs_inode_timespec *
509 btrfs_inode_ctime(struct btrfs_inode_item *inode_item)
511 unsigned long ptr = (unsigned long)inode_item;
512 ptr += offsetof(struct btrfs_inode_item, ctime);
513 return (struct btrfs_inode_timespec *)ptr;
516 static inline struct btrfs_inode_timespec *
517 btrfs_inode_otime(struct btrfs_inode_item *inode_item)
519 unsigned long ptr = (unsigned long)inode_item;
520 ptr += offsetof(struct btrfs_inode_item, otime);
521 return (struct btrfs_inode_timespec *)ptr;
524 BTRFS_SETGET_FUNCS(timespec_sec, struct btrfs_inode_timespec, sec, 64);
525 BTRFS_SETGET_FUNCS(timespec_nsec, struct btrfs_inode_timespec, nsec, 32);
527 /* struct btrfs_extent_item */
528 BTRFS_SETGET_FUNCS(extent_refs, struct btrfs_extent_item, refs, 32);
529 BTRFS_SETGET_FUNCS(extent_owner, struct btrfs_extent_item, owner, 64);
531 BTRFS_SETGET_STACK_FUNCS(stack_extent_refs, struct btrfs_extent_item,
533 BTRFS_SETGET_STACK_FUNCS(stack_extent_owner, struct btrfs_extent_item,
536 /* struct btrfs_node */
537 BTRFS_SETGET_FUNCS(key_blockptr, struct btrfs_key_ptr, blockptr, 64);
539 static inline u64 btrfs_node_blockptr(struct extent_buffer *eb, int nr)
542 ptr = offsetof(struct btrfs_node, ptrs) +
543 sizeof(struct btrfs_key_ptr) * nr;
544 return btrfs_key_blockptr(eb, (struct btrfs_key_ptr *)ptr);
547 static inline void btrfs_set_node_blockptr(struct extent_buffer *eb,
551 ptr = offsetof(struct btrfs_node, ptrs) +
552 sizeof(struct btrfs_key_ptr) * nr;
553 btrfs_set_key_blockptr(eb, (struct btrfs_key_ptr *)ptr, val);
556 static inline unsigned long btrfs_node_key_ptr_offset(int nr)
558 return offsetof(struct btrfs_node, ptrs) +
559 sizeof(struct btrfs_key_ptr) * nr;
562 void btrfs_node_key(struct extent_buffer *eb,
563 struct btrfs_disk_key *disk_key, int nr);
565 static inline void btrfs_set_node_key(struct extent_buffer *eb,
566 struct btrfs_disk_key *disk_key, int nr)
569 ptr = btrfs_node_key_ptr_offset(nr);
570 write_eb_member(eb, (struct btrfs_key_ptr *)ptr,
571 struct btrfs_key_ptr, key, disk_key);
574 /* struct btrfs_item */
575 BTRFS_SETGET_FUNCS(item_offset, struct btrfs_item, offset, 32);
576 BTRFS_SETGET_FUNCS(item_size, struct btrfs_item, size, 32);
578 static inline unsigned long btrfs_item_nr_offset(int nr)
580 return offsetof(struct btrfs_leaf, items) +
581 sizeof(struct btrfs_item) * nr;
584 static inline struct btrfs_item *btrfs_item_nr(struct extent_buffer *eb,
587 return (struct btrfs_item *)btrfs_item_nr_offset(nr);
590 static inline u32 btrfs_item_end(struct extent_buffer *eb,
591 struct btrfs_item *item)
593 return btrfs_item_offset(eb, item) + btrfs_item_size(eb, item);
596 static inline u32 btrfs_item_end_nr(struct extent_buffer *eb, int nr)
598 return btrfs_item_end(eb, btrfs_item_nr(eb, nr));
601 static inline u32 btrfs_item_offset_nr(struct extent_buffer *eb, int nr)
603 return btrfs_item_offset(eb, btrfs_item_nr(eb, nr));
606 static inline u32 btrfs_item_size_nr(struct extent_buffer *eb, int nr)
608 return btrfs_item_size(eb, btrfs_item_nr(eb, nr));
611 static inline void btrfs_item_key(struct extent_buffer *eb,
612 struct btrfs_disk_key *disk_key, int nr)
614 struct btrfs_item *item = btrfs_item_nr(eb, nr);
615 read_eb_member(eb, item, struct btrfs_item, key, disk_key);
618 static inline void btrfs_set_item_key(struct extent_buffer *eb,
619 struct btrfs_disk_key *disk_key, int nr)
621 struct btrfs_item *item = btrfs_item_nr(eb, nr);
622 write_eb_member(eb, item, struct btrfs_item, key, disk_key);
625 /* struct btrfs_dir_item */
626 BTRFS_SETGET_FUNCS(dir_data_len, struct btrfs_dir_item, data_len, 16);
627 BTRFS_SETGET_FUNCS(dir_type, struct btrfs_dir_item, type, 8);
628 BTRFS_SETGET_FUNCS(dir_name_len, struct btrfs_dir_item, name_len, 16);
630 static inline void btrfs_dir_item_key(struct extent_buffer *eb,
631 struct btrfs_dir_item *item,
632 struct btrfs_disk_key *key)
634 read_eb_member(eb, item, struct btrfs_dir_item, location, key);
637 static inline void btrfs_set_dir_item_key(struct extent_buffer *eb,
638 struct btrfs_dir_item *item,
639 struct btrfs_disk_key *key)
641 write_eb_member(eb, item, struct btrfs_dir_item, location, key);
644 /* struct btrfs_disk_key */
645 BTRFS_SETGET_STACK_FUNCS(disk_key_objectid, struct btrfs_disk_key,
647 BTRFS_SETGET_STACK_FUNCS(disk_key_offset, struct btrfs_disk_key, offset, 64);
648 BTRFS_SETGET_STACK_FUNCS(disk_key_type, struct btrfs_disk_key, type, 8);
650 static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu,
651 struct btrfs_disk_key *disk)
653 cpu->offset = le64_to_cpu(disk->offset);
654 cpu->type = disk->type;
655 cpu->objectid = le64_to_cpu(disk->objectid);
658 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk,
659 struct btrfs_key *cpu)
661 disk->offset = cpu_to_le64(cpu->offset);
662 disk->type = cpu->type;
663 disk->objectid = cpu_to_le64(cpu->objectid);
666 static inline void btrfs_node_key_to_cpu(struct extent_buffer *eb,
667 struct btrfs_key *key, int nr)
669 struct btrfs_disk_key disk_key;
670 btrfs_node_key(eb, &disk_key, nr);
671 btrfs_disk_key_to_cpu(key, &disk_key);
674 static inline void btrfs_item_key_to_cpu(struct extent_buffer *eb,
675 struct btrfs_key *key, int nr)
677 struct btrfs_disk_key disk_key;
678 btrfs_item_key(eb, &disk_key, nr);
679 btrfs_disk_key_to_cpu(key, &disk_key);
682 static inline void btrfs_dir_item_key_to_cpu(struct extent_buffer *eb,
683 struct btrfs_dir_item *item,
684 struct btrfs_key *key)
686 struct btrfs_disk_key disk_key;
687 btrfs_dir_item_key(eb, item, &disk_key);
688 btrfs_disk_key_to_cpu(key, &disk_key);
692 static inline u8 btrfs_key_type(struct btrfs_key *key)
697 static inline void btrfs_set_key_type(struct btrfs_key *key, u8 val)
702 /* struct btrfs_header */
703 BTRFS_SETGET_HEADER_FUNCS(header_bytenr, struct btrfs_header, bytenr, 64);
704 BTRFS_SETGET_HEADER_FUNCS(header_generation, struct btrfs_header,
706 BTRFS_SETGET_HEADER_FUNCS(header_owner, struct btrfs_header, owner, 64);
707 BTRFS_SETGET_HEADER_FUNCS(header_nritems, struct btrfs_header, nritems, 32);
708 BTRFS_SETGET_HEADER_FUNCS(header_flags, struct btrfs_header, flags, 16);
709 BTRFS_SETGET_HEADER_FUNCS(header_level, struct btrfs_header, level, 8);
711 static inline u8 *btrfs_header_fsid(struct extent_buffer *eb)
713 unsigned long ptr = offsetof(struct btrfs_header, fsid);
717 static inline u8 *btrfs_super_fsid(struct extent_buffer *eb)
719 unsigned long ptr = offsetof(struct btrfs_super_block, fsid);
723 static inline u8 *btrfs_header_csum(struct extent_buffer *eb)
725 unsigned long ptr = offsetof(struct btrfs_header, csum);
729 static inline struct btrfs_node *btrfs_buffer_node(struct extent_buffer *eb)
734 static inline struct btrfs_leaf *btrfs_buffer_leaf(struct extent_buffer *eb)
739 static inline struct btrfs_header *btrfs_buffer_header(struct extent_buffer *eb)
744 static inline int btrfs_is_leaf(struct extent_buffer *eb)
746 return (btrfs_header_level(eb) == 0);
749 /* struct btrfs_root_item */
750 BTRFS_SETGET_FUNCS(disk_root_refs, struct btrfs_root_item, refs, 32);
751 BTRFS_SETGET_FUNCS(disk_root_bytenr, struct btrfs_root_item, bytenr, 64);
752 BTRFS_SETGET_FUNCS(disk_root_level, struct btrfs_root_item, level, 8);
754 BTRFS_SETGET_STACK_FUNCS(root_bytenr, struct btrfs_root_item, bytenr, 64);
755 BTRFS_SETGET_STACK_FUNCS(root_level, struct btrfs_root_item, level, 8);
756 BTRFS_SETGET_STACK_FUNCS(root_dirid, struct btrfs_root_item, root_dirid, 64);
757 BTRFS_SETGET_STACK_FUNCS(root_refs, struct btrfs_root_item, refs, 32);
758 BTRFS_SETGET_STACK_FUNCS(root_flags, struct btrfs_root_item, flags, 32);
759 BTRFS_SETGET_STACK_FUNCS(root_used, struct btrfs_root_item, bytes_used, 64);
760 BTRFS_SETGET_STACK_FUNCS(root_limit, struct btrfs_root_item, byte_limit, 64);
762 /* struct btrfs_super_block */
763 BTRFS_SETGET_STACK_FUNCS(super_bytenr, struct btrfs_super_block, bytenr, 64);
764 BTRFS_SETGET_STACK_FUNCS(super_generation, struct btrfs_super_block,
766 BTRFS_SETGET_STACK_FUNCS(super_root, struct btrfs_super_block, root, 64);
767 BTRFS_SETGET_STACK_FUNCS(super_root_level, struct btrfs_super_block,
769 BTRFS_SETGET_STACK_FUNCS(super_total_bytes, struct btrfs_super_block,
771 BTRFS_SETGET_STACK_FUNCS(super_bytes_used, struct btrfs_super_block,
773 BTRFS_SETGET_STACK_FUNCS(super_sectorsize, struct btrfs_super_block,
775 BTRFS_SETGET_STACK_FUNCS(super_nodesize, struct btrfs_super_block,
777 BTRFS_SETGET_STACK_FUNCS(super_leafsize, struct btrfs_super_block,
779 BTRFS_SETGET_STACK_FUNCS(super_root_dir, struct btrfs_super_block,
780 root_dir_objectid, 64);
782 static inline unsigned long btrfs_leaf_data(struct extent_buffer *l)
784 return offsetof(struct btrfs_leaf, items);
787 /* struct btrfs_file_extent_item */
788 BTRFS_SETGET_FUNCS(file_extent_type, struct btrfs_file_extent_item, type, 8);
790 static inline unsigned long btrfs_file_extent_inline_start(struct
791 btrfs_file_extent_item *e)
793 unsigned long offset = (unsigned long)e;
794 offset += offsetof(struct btrfs_file_extent_item, disk_bytenr);
798 static inline u32 btrfs_file_extent_calc_inline_size(u32 datasize)
800 return offsetof(struct btrfs_file_extent_item, disk_bytenr) + datasize;
803 static inline u32 btrfs_file_extent_inline_len(struct extent_buffer *eb,
804 struct btrfs_item *e)
806 unsigned long offset;
807 offset = offsetof(struct btrfs_file_extent_item, disk_bytenr);
808 return btrfs_item_size(eb, e) - offset;
811 BTRFS_SETGET_FUNCS(file_extent_disk_bytenr, struct btrfs_file_extent_item,
813 BTRFS_SETGET_FUNCS(file_extent_generation, struct btrfs_file_extent_item,
815 BTRFS_SETGET_FUNCS(file_extent_disk_num_bytes, struct btrfs_file_extent_item,
817 BTRFS_SETGET_FUNCS(file_extent_offset, struct btrfs_file_extent_item,
819 BTRFS_SETGET_FUNCS(file_extent_num_bytes, struct btrfs_file_extent_item,
822 static inline struct btrfs_root *btrfs_sb(struct super_block *sb)
824 return sb->s_fs_info;
827 static inline int btrfs_set_root_name(struct btrfs_root *root,
828 const char *name, int len)
830 /* if we already have a name just free it */
834 root->name = kmalloc(len+1, GFP_KERNEL);
838 memcpy(root->name, name, len);
839 root->name[len] ='\0';
844 static inline u32 btrfs_level_size(struct btrfs_root *root, int level) {
846 return root->leafsize;
847 return root->nodesize;
850 /* helper function to cast into the data area of the leaf. */
851 #define btrfs_item_ptr(leaf, slot, type) \
852 ((type *)(btrfs_leaf_data(leaf) + \
853 btrfs_item_offset_nr(leaf, slot)))
855 #define btrfs_item_ptr_offset(leaf, slot) \
856 ((unsigned long)(btrfs_leaf_data(leaf) + \
857 btrfs_item_offset_nr(leaf, slot)))
859 /* mount option defines and helpers */
860 #define BTRFS_MOUNT_SUBVOL 0x000001
861 #define btrfs_clear_opt(o, opt) o &= ~BTRFS_MOUNT_##opt
862 #define btrfs_set_opt(o, opt) o |= BTRFS_MOUNT_##opt
863 #define btrfs_test_opt(sb, opt) (BTRFS_SB(sb)->s_mount_opt & \
866 int btrfs_extent_post_op(struct btrfs_trans_handle *trans,
867 struct btrfs_root *root);
868 int btrfs_copy_pinned(struct btrfs_root *root, struct extent_map_tree *copy);
869 struct btrfs_block_group_cache *btrfs_lookup_block_group(struct
872 struct btrfs_block_group_cache *btrfs_find_block_group(struct btrfs_root *root,
873 struct btrfs_block_group_cache
874 *hint, u64 search_start,
875 int data, int owner);
876 int btrfs_inc_root_ref(struct btrfs_trans_handle *trans,
877 struct btrfs_root *root);
878 struct extent_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
879 struct btrfs_root *root, u32 size,
880 u64 hint, u64 empty_size);
881 int btrfs_alloc_extent(struct btrfs_trans_handle *trans,
882 struct btrfs_root *root, u64 owner,
883 u64 num_bytes, u64 empty_size, u64 search_start,
884 u64 search_end, struct btrfs_key *ins, int data);
885 int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
886 struct extent_buffer *buf);
887 int btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
888 *root, u64 bytenr, u64 num_bytes, int pin);
889 int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans,
890 struct btrfs_root *root,
891 struct extent_map_tree *unpin);
892 int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
893 struct btrfs_root *root,
894 u64 bytenr, u64 num_bytes);
895 int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans,
896 struct btrfs_root *root);
897 int btrfs_free_block_groups(struct btrfs_fs_info *info);
898 int btrfs_read_block_groups(struct btrfs_root *root);
900 int btrfs_cow_block(struct btrfs_trans_handle *trans,
901 struct btrfs_root *root, struct extent_buffer *buf,
902 struct extent_buffer *parent, int parent_slot,
903 struct extent_buffer **cow_ret);
904 int btrfs_extend_item(struct btrfs_trans_handle *trans, struct btrfs_root
905 *root, struct btrfs_path *path, u32 data_size);
906 int btrfs_truncate_item(struct btrfs_trans_handle *trans,
907 struct btrfs_root *root,
908 struct btrfs_path *path,
909 u32 new_size, int from_end);
910 int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root
911 *root, struct btrfs_key *key, struct btrfs_path *p, int
913 int btrfs_realloc_node(struct btrfs_trans_handle *trans,
914 struct btrfs_root *root, struct extent_buffer *parent,
915 int start_slot, int cache_only, u64 *last_ret,
916 struct btrfs_key *progress);
917 void btrfs_release_path(struct btrfs_root *root, struct btrfs_path *p);
918 struct btrfs_path *btrfs_alloc_path(void);
919 void btrfs_free_path(struct btrfs_path *p);
920 void btrfs_init_path(struct btrfs_path *p);
921 int btrfs_del_item(struct btrfs_trans_handle *trans, struct btrfs_root *root,
922 struct btrfs_path *path);
923 int btrfs_insert_item(struct btrfs_trans_handle *trans, struct btrfs_root
924 *root, struct btrfs_key *key, void *data, u32 data_size);
925 int btrfs_insert_empty_item(struct btrfs_trans_handle *trans, struct btrfs_root
926 *root, struct btrfs_path *path, struct btrfs_key
927 *cpu_key, u32 data_size);
928 int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path);
929 int btrfs_leaf_free_space(struct btrfs_root *root, struct extent_buffer *leaf);
930 int btrfs_drop_snapshot(struct btrfs_trans_handle *trans, struct btrfs_root
933 int btrfs_del_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
934 struct btrfs_key *key);
935 int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root
936 *root, struct btrfs_key *key, struct btrfs_root_item
938 int btrfs_update_root(struct btrfs_trans_handle *trans, struct btrfs_root
939 *root, struct btrfs_key *key, struct btrfs_root_item
941 int btrfs_find_last_root(struct btrfs_root *root, u64 objectid, struct
942 btrfs_root_item *item, struct btrfs_key *key);
943 int btrfs_find_dead_roots(struct btrfs_root *root, u64 objectid,
944 struct btrfs_root *latest_root);
946 int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
947 *root, const char *name, int name_len, u64 dir,
948 struct btrfs_key *location, u8 type);
949 struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans,
950 struct btrfs_root *root,
951 struct btrfs_path *path, u64 dir,
952 const char *name, int name_len,
954 struct btrfs_dir_item *
955 btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans,
956 struct btrfs_root *root,
957 struct btrfs_path *path, u64 dir,
958 u64 objectid, const char *name, int name_len,
960 struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_root *root,
961 struct btrfs_path *path,
962 const char *name, int name_len);
963 int btrfs_delete_one_dir_name(struct btrfs_trans_handle *trans,
964 struct btrfs_root *root,
965 struct btrfs_path *path,
966 struct btrfs_dir_item *di);
967 int btrfs_insert_xattr_item(struct btrfs_trans_handle *trans,
968 struct btrfs_root *root, const char *name,
969 u16 name_len, const void *data, u16 data_len,
971 struct btrfs_dir_item *btrfs_lookup_xattr(struct btrfs_trans_handle *trans,
972 struct btrfs_root *root,
973 struct btrfs_path *path, u64 dir,
974 const char *name, u16 name_len,
977 int btrfs_find_free_objectid(struct btrfs_trans_handle *trans,
978 struct btrfs_root *fs_root,
979 u64 dirid, u64 *objectid);
980 int btrfs_find_highest_inode(struct btrfs_root *fs_root, u64 *objectid);
983 int btrfs_insert_empty_inode(struct btrfs_trans_handle *trans,
984 struct btrfs_root *root,
985 struct btrfs_path *path, u64 objectid);
986 int btrfs_lookup_inode(struct btrfs_trans_handle *trans, struct btrfs_root
987 *root, struct btrfs_path *path,
988 struct btrfs_key *location, int mod);
991 int btrfs_insert_file_extent(struct btrfs_trans_handle *trans,
992 struct btrfs_root *root,
993 u64 objectid, u64 pos, u64 offset,
996 int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
997 struct btrfs_root *root,
998 struct btrfs_path *path, u64 objectid,
999 u64 bytenr, int mod);
1000 int btrfs_csum_file_block(struct btrfs_trans_handle *trans,
1001 struct btrfs_root *root,
1002 struct inode *inode,
1003 u64 objectid, u64 offset,
1004 char *data, size_t len);
1005 struct btrfs_csum_item *btrfs_lookup_csum(struct btrfs_trans_handle *trans,
1006 struct btrfs_root *root,
1007 struct btrfs_path *path,
1008 u64 objectid, u64 offset,
1010 int btrfs_csum_truncate(struct btrfs_trans_handle *trans,
1011 struct btrfs_root *root, struct btrfs_path *path,
1014 int btrfs_page_mkwrite(struct vm_area_struct *vma, struct page *page);
1015 int btrfs_readpage(struct file *file, struct page *page);
1016 void btrfs_delete_inode(struct inode *inode);
1017 void btrfs_read_locked_inode(struct inode *inode);
1018 int btrfs_write_inode(struct inode *inode, int wait);
1019 void btrfs_dirty_inode(struct inode *inode);
1020 struct inode *btrfs_alloc_inode(struct super_block *sb);
1021 void btrfs_destroy_inode(struct inode *inode);
1022 int btrfs_init_cachep(void);
1023 void btrfs_destroy_cachep(void);
1024 long btrfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
1025 struct inode *btrfs_iget_locked(struct super_block *s, u64 objectid,
1026 struct btrfs_root *root);
1027 int btrfs_commit_write(struct file *file, struct page *page,
1028 unsigned from, unsigned to);
1029 struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page,
1030 size_t page_offset, u64 start, u64 end,
1032 int btrfs_update_inode(struct btrfs_trans_handle *trans,
1033 struct btrfs_root *root,
1034 struct inode *inode);
1036 int btrfs_drop_extent_cache(struct inode *inode, u64 start, u64 end);
1037 extern struct file_operations btrfs_file_operations;
1038 int btrfs_drop_extents(struct btrfs_trans_handle *trans,
1039 struct btrfs_root *root, struct inode *inode,
1040 u64 start, u64 end, u64 inline_limit, u64 *hint_block);
1042 int btrfs_defrag_leaves(struct btrfs_trans_handle *trans,
1043 struct btrfs_root *root, int cache_only);
1046 int btrfs_init_sysfs(void);
1047 void btrfs_exit_sysfs(void);
1048 int btrfs_sysfs_add_super(struct btrfs_fs_info *fs);
1049 int btrfs_sysfs_add_root(struct btrfs_root *root);
1050 void btrfs_sysfs_del_root(struct btrfs_root *root);
1051 void btrfs_sysfs_del_super(struct btrfs_fs_info *root);
1054 ssize_t btrfs_listxattr(struct dentry *dentry, char *buffer, size_t size);
1055 int btrfs_delete_xattrs(struct btrfs_trans_handle *trans,
1056 struct btrfs_root *root, struct inode *inode);