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.
19 #ifndef __BTRFS_CTREE__
20 #define __BTRFS_CTREE__
22 #include <linux/version.h>
24 #include <linux/highmem.h>
26 #include <linux/workqueue.h>
27 #include <linux/completion.h>
28 #include <linux/backing-dev.h>
29 #include <asm/kmap_types.h>
30 #include "bit-radix.h"
31 #include "extent_io.h"
32 #include "extent_map.h"
34 struct btrfs_trans_handle;
35 struct btrfs_transaction;
36 extern struct kmem_cache *btrfs_trans_handle_cachep;
37 extern struct kmem_cache *btrfs_transaction_cachep;
38 extern struct kmem_cache *btrfs_bit_radix_cachep;
39 extern struct kmem_cache *btrfs_path_cachep;
41 #define BTRFS_MAGIC "_B5RfS_M"
43 #define BTRFS_MAX_LEVEL 8
45 /* holds pointers to all of the tree roots */
46 #define BTRFS_ROOT_TREE_OBJECTID 1ULL
48 /* stores information about which extents are in use, and reference counts */
49 #define BTRFS_EXTENT_TREE_OBJECTID 2ULL
52 * chunk tree stores translations from logical -> physical block numbering
53 * the super block points to the chunk tree
55 #define BTRFS_CHUNK_TREE_OBJECTID 3ULL
58 * stores information about which areas of a given device are in use.
59 * one per device. The tree of tree roots points to the device tree
61 #define BTRFS_DEV_TREE_OBJECTID 4ULL
63 /* one per subvolume, storing files and directories */
64 #define BTRFS_FS_TREE_OBJECTID 5ULL
66 /* directory objectid inside the root tree */
67 #define BTRFS_ROOT_TREE_DIR_OBJECTID 6ULL
70 * All files have objectids higher than this.
72 #define BTRFS_FIRST_FREE_OBJECTID 256ULL
73 #define BTRFS_FIRST_CHUNK_TREE_OBJECTID 256ULL
77 * the device items go into the chunk tree. The key is in the form
78 * [ 1 BTRFS_DEV_ITEM_KEY device_id ]
80 #define BTRFS_DEV_ITEMS_OBJECTID 1ULL
83 * we can actually store much bigger names, but lets not confuse the rest
86 #define BTRFS_NAME_LEN 255
88 /* 32 bytes in various csum fields */
89 #define BTRFS_CSUM_SIZE 32
90 /* four bytes for CRC32 */
91 #define BTRFS_CRC32_SIZE 4
92 #define BTRFS_EMPTY_DIR_SIZE 0
94 #define BTRFS_FT_UNKNOWN 0
95 #define BTRFS_FT_REG_FILE 1
96 #define BTRFS_FT_DIR 2
97 #define BTRFS_FT_CHRDEV 3
98 #define BTRFS_FT_BLKDEV 4
99 #define BTRFS_FT_FIFO 5
100 #define BTRFS_FT_SOCK 6
101 #define BTRFS_FT_SYMLINK 7
102 #define BTRFS_FT_XATTR 8
103 #define BTRFS_FT_MAX 9
106 * the key defines the order in the tree, and so it also defines (optimal)
107 * block layout. objectid corresonds to the inode number. The flags
108 * tells us things about the object, and is a kind of stream selector.
109 * so for a given inode, keys with flags of 1 might refer to the inode
110 * data, flags of 2 may point to file data in the btree and flags == 3
111 * may point to extents.
113 * offset is the starting byte offset for this key in the stream.
115 * btrfs_disk_key is in disk byte order. struct btrfs_key is always
116 * in cpu native order. Otherwise they are identical and their sizes
117 * should be the same (ie both packed)
119 struct btrfs_disk_key {
123 } __attribute__ ((__packed__));
129 } __attribute__ ((__packed__));
131 struct btrfs_mapping_tree {
132 struct extent_map_tree map_tree;
135 #define BTRFS_UUID_SIZE 16
136 struct btrfs_dev_item {
137 /* the internal btrfs device id */
140 /* size of the device */
146 /* optimal io alignment for this device */
149 /* optimal io width for this device */
152 /* minimal io size for this device */
155 /* type and info about this device */
158 /* grouping information for allocation decisions */
161 /* seek speed 0-100 where 100 is fastest */
164 /* bandwidth 0-100 where 100 is fastest */
167 /* btrfs generated uuid for this device */
168 u8 uuid[BTRFS_UUID_SIZE];
169 } __attribute__ ((__packed__));
171 struct btrfs_stripe {
174 u8 dev_uuid[BTRFS_UUID_SIZE];
175 } __attribute__ ((__packed__));
178 /* size of this chunk in bytes */
181 /* objectid of the root referencing this chunk */
187 /* optimal io alignment for this chunk */
190 /* optimal io width for this chunk */
193 /* minimal io size for this chunk */
196 /* 2^16 stripes is quite a lot, a second limit is the size of a single
200 struct btrfs_stripe stripe;
201 /* additional stripes go here */
202 } __attribute__ ((__packed__));
204 static inline unsigned long btrfs_chunk_item_size(int num_stripes)
206 BUG_ON(num_stripes == 0);
207 return sizeof(struct btrfs_chunk) +
208 sizeof(struct btrfs_stripe) * (num_stripes - 1);
211 #define BTRFS_FSID_SIZE 16
212 #define BTRFS_HEADER_FLAG_WRITTEN (1 << 0)
215 * every tree block (leaf or node) starts with this header.
217 struct btrfs_header {
218 /* these first four must match the super block */
219 u8 csum[BTRFS_CSUM_SIZE];
220 u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
221 __le64 bytenr; /* which block this node is supposed to live in */
224 /* allowed to be different from the super from here on down */
225 u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
230 } __attribute__ ((__packed__));
232 #define BTRFS_NODEPTRS_PER_BLOCK(r) (((r)->nodesize - \
233 sizeof(struct btrfs_header)) / \
234 sizeof(struct btrfs_key_ptr))
235 #define __BTRFS_LEAF_DATA_SIZE(bs) ((bs) - sizeof(struct btrfs_header))
236 #define BTRFS_LEAF_DATA_SIZE(r) (__BTRFS_LEAF_DATA_SIZE(r->leafsize))
237 #define BTRFS_MAX_INLINE_DATA_SIZE(r) (BTRFS_LEAF_DATA_SIZE(r) - \
238 sizeof(struct btrfs_item) - \
239 sizeof(struct btrfs_file_extent_item))
243 * this is a very generous portion of the super block, giving us
244 * room to translate 14 chunks with 3 stripes each.
246 #define BTRFS_SYSTEM_CHUNK_ARRAY_SIZE 2048
249 * the super block basically lists the main trees of the FS
250 * it currently lacks any block count etc etc
252 struct btrfs_super_block {
253 u8 csum[BTRFS_CSUM_SIZE];
254 /* the first 4 fields must match struct btrfs_header */
255 u8 fsid[16]; /* FS specific uuid */
256 __le64 bytenr; /* this block number */
259 /* allowed to be different from the btrfs_header from here own down */
266 __le64 root_dir_objectid;
272 __le32 sys_chunk_array_size;
275 struct btrfs_dev_item dev_item;
276 u8 sys_chunk_array[BTRFS_SYSTEM_CHUNK_ARRAY_SIZE];
277 } __attribute__ ((__packed__));
280 * A leaf is full of items. offset and size tell us where to find
281 * the item in the leaf (relative to the start of the data area)
284 struct btrfs_disk_key key;
287 } __attribute__ ((__packed__));
290 * leaves have an item area and a data area:
291 * [item0, item1....itemN] [free space] [dataN...data1, data0]
293 * The data is separate from the items to get the keys closer together
297 struct btrfs_header header;
298 struct btrfs_item items[];
299 } __attribute__ ((__packed__));
302 * all non-leaf blocks are nodes, they hold only keys and pointers to
305 struct btrfs_key_ptr {
306 struct btrfs_disk_key key;
309 } __attribute__ ((__packed__));
312 struct btrfs_header header;
313 struct btrfs_key_ptr ptrs[];
314 } __attribute__ ((__packed__));
317 * btrfs_paths remember the path taken from the root down to the leaf.
318 * level 0 is always the leaf, and nodes[1...BTRFS_MAX_LEVEL] will point
319 * to any other levels that are present.
321 * The slots array records the index of the item or block pointer
322 * used while walking the tree.
325 struct extent_buffer *nodes[BTRFS_MAX_LEVEL];
326 int slots[BTRFS_MAX_LEVEL];
332 * items in the extent btree are used to record the objectid of the
333 * owner of the block and the number of references
335 struct btrfs_extent_item {
337 } __attribute__ ((__packed__));
339 struct btrfs_extent_ref {
344 } __attribute__ ((__packed__));
346 /* dev extents record free space on individual devices. The owner
347 * field points back to the chunk allocation mapping tree that allocated
348 * the extent. The chunk tree uuid field is a way to double check the owner
350 struct btrfs_dev_extent {
352 __le64 chunk_objectid;
355 u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
356 } __attribute__ ((__packed__));
358 struct btrfs_inode_ref {
361 } __attribute__ ((__packed__));
363 struct btrfs_timespec {
366 } __attribute__ ((__packed__));
369 * there is no padding here on purpose. If you want to extent the inode,
370 * make a new item type
372 struct btrfs_inode_item {
384 struct btrfs_timespec atime;
385 struct btrfs_timespec ctime;
386 struct btrfs_timespec mtime;
387 struct btrfs_timespec otime;
388 } __attribute__ ((__packed__));
390 struct btrfs_dir_item {
391 struct btrfs_disk_key location;
395 } __attribute__ ((__packed__));
397 struct btrfs_root_item {
398 struct btrfs_inode_item inode;
405 struct btrfs_disk_key drop_progress;
408 } __attribute__ ((__packed__));
410 #define BTRFS_FILE_EXTENT_REG 0
411 #define BTRFS_FILE_EXTENT_INLINE 1
413 struct btrfs_file_extent_item {
417 * disk space consumed by the extent, checksum blocks are included
421 __le64 disk_num_bytes;
423 * the logical offset in file blocks (no csums)
424 * this extent record is for. This allows a file extent to point
425 * into the middle of an existing extent on disk, sharing it
426 * between two snapshots (useful if some bytes in the middle of the
427 * extent have changed
431 * the logical number of file blocks (no csums included)
434 } __attribute__ ((__packed__));
436 struct btrfs_csum_item {
438 } __attribute__ ((__packed__));
440 /* different types of block groups (and chunks) */
441 #define BTRFS_BLOCK_GROUP_DATA (1 << 0)
442 #define BTRFS_BLOCK_GROUP_SYSTEM (1 << 1)
443 #define BTRFS_BLOCK_GROUP_METADATA (1 << 2)
444 #define BTRFS_BLOCK_GROUP_RAID0 (1 << 3)
445 #define BTRFS_BLOCK_GROUP_RAID1 (1 << 4)
446 #define BTRFS_BLOCK_GROUP_DUP (1 << 5)
449 struct btrfs_block_group_item {
451 __le64 chunk_objectid;
453 } __attribute__ ((__packed__));
455 struct btrfs_space_info {
461 struct list_head list;
464 struct btrfs_block_group_cache {
465 struct btrfs_key key;
466 struct btrfs_block_group_item item;
467 struct btrfs_space_info *space_info;
474 struct btrfs_fs_devices;
475 struct btrfs_fs_info {
476 u8 fsid[BTRFS_FSID_SIZE];
477 u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
478 struct btrfs_root *extent_root;
479 struct btrfs_root *tree_root;
480 struct btrfs_root *chunk_root;
481 struct btrfs_root *dev_root;
482 struct radix_tree_root fs_roots_radix;
484 struct extent_io_tree free_space_cache;
485 struct extent_io_tree block_group_cache;
486 struct extent_io_tree pinned_extents;
487 struct extent_io_tree pending_del;
488 struct extent_io_tree extent_ins;
490 /* logical->physical extent mapping */
491 struct btrfs_mapping_tree mapping_tree;
494 u64 last_trans_committed;
495 unsigned long mount_opt;
499 struct btrfs_transaction *running_transaction;
500 struct btrfs_super_block super_copy;
501 struct extent_buffer *sb_buffer;
502 struct block_device *__bdev;
503 struct super_block *sb;
504 struct inode *btree_inode;
505 struct backing_dev_info bdi;
506 spinlock_t hash_lock;
507 struct mutex trans_mutex;
508 struct mutex fs_mutex;
509 struct list_head trans_list;
510 struct list_head hashers;
511 struct list_head dead_roots;
512 struct list_head end_io_work_list;
513 struct work_struct end_io_work;
514 spinlock_t end_io_work_lock;
516 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
517 struct work_struct trans_work;
519 struct delayed_work trans_work;
521 struct kobject super_kobj;
522 struct completion kobj_unregister;
525 unsigned long throttles;
528 struct list_head dirty_cowonly_roots;
530 struct btrfs_fs_devices *fs_devices;
531 struct list_head space_info;
532 spinlock_t delalloc_lock;
533 spinlock_t new_trans_lock;
538 u64 avail_data_alloc_bits;
539 u64 avail_metadata_alloc_bits;
540 u64 avail_system_alloc_bits;
541 u64 data_alloc_profile;
542 u64 metadata_alloc_profile;
543 u64 system_alloc_profile;
547 * in ram representation of the tree. extent_root is used for all allocations
548 * and for the extent tree extent_root root.
551 struct extent_buffer *node;
552 struct extent_buffer *commit_root;
553 struct btrfs_root_item root_item;
554 struct btrfs_key root_key;
555 struct btrfs_fs_info *fs_info;
557 struct kobject root_kobj;
558 struct completion kobj_unregister;
562 /* data allocations are done in sectorsize units */
565 /* node allocations are done in nodesize units */
568 /* leaf allocations are done in leafsize units */
575 u64 last_inode_alloc;
578 struct btrfs_key defrag_progress;
584 /* the dirty list is only used by non-reference counted roots */
585 struct list_head dirty_list;
590 * inode items have the data typically returned from stat and store other
591 * info about object characteristics. There is one for every file and dir in
594 #define BTRFS_INODE_ITEM_KEY 1
595 #define BTRFS_INODE_REF_KEY 2
596 #define BTRFS_XATTR_ITEM_KEY 8
597 /* reserve 2-15 close to the inode for later flexibility */
600 * dir items are the name -> inode pointers in a directory. There is one
601 * for every name in a directory.
603 #define BTRFS_DIR_ITEM_KEY 16
604 #define BTRFS_DIR_INDEX_KEY 17
606 * extent data is for file data
608 #define BTRFS_EXTENT_DATA_KEY 18
610 * csum items have the checksums for data in the extents
612 #define BTRFS_CSUM_ITEM_KEY 19
614 /* reserve 20-31 for other file stuff */
617 * root items point to tree roots. There are typically in the root
618 * tree used by the super block to find all the other trees
620 #define BTRFS_ROOT_ITEM_KEY 32
622 * extent items are in the extent map tree. These record which blocks
623 * are used, and how many references there are to each block
625 #define BTRFS_EXTENT_ITEM_KEY 33
626 #define BTRFS_EXTENT_REF_KEY 34
629 * block groups give us hints into the extent allocation trees. Which
630 * blocks are free etc etc
632 #define BTRFS_BLOCK_GROUP_ITEM_KEY 50
634 #define BTRFS_DEV_EXTENT_KEY 75
635 #define BTRFS_DEV_ITEM_KEY 76
636 #define BTRFS_CHUNK_ITEM_KEY 77
639 * string items are for debugging. They just store a short string of
642 #define BTRFS_STRING_ITEM_KEY 253
644 #define BTRFS_MOUNT_NODATASUM (1 << 0)
645 #define BTRFS_MOUNT_NODATACOW (1 << 1)
646 #define BTRFS_MOUNT_NOBARRIER (1 << 2)
647 #define BTRFS_MOUNT_SSD (1 << 3)
649 #define btrfs_clear_opt(o, opt) ((o) &= ~BTRFS_MOUNT_##opt)
650 #define btrfs_set_opt(o, opt) ((o) |= BTRFS_MOUNT_##opt)
651 #define btrfs_test_opt(root, opt) ((root)->fs_info->mount_opt & \
656 #define BTRFS_INODE_NODATASUM (1 << 0)
657 #define BTRFS_INODE_NODATACOW (1 << 1)
658 #define BTRFS_INODE_READONLY (1 << 2)
659 #define btrfs_clear_flag(inode, flag) (BTRFS_I(inode)->flags &= \
661 #define btrfs_set_flag(inode, flag) (BTRFS_I(inode)->flags |= \
663 #define btrfs_test_flag(inode, flag) (BTRFS_I(inode)->flags & \
665 /* some macros to generate set/get funcs for the struct fields. This
666 * assumes there is a lefoo_to_cpu for every type, so lets make a simple
669 #define le8_to_cpu(v) (v)
670 #define cpu_to_le8(v) (v)
673 #define read_eb_member(eb, ptr, type, member, result) ( \
674 read_extent_buffer(eb, (char *)(result), \
675 ((unsigned long)(ptr)) + \
676 offsetof(type, member), \
677 sizeof(((type *)0)->member)))
679 #define write_eb_member(eb, ptr, type, member, result) ( \
680 write_extent_buffer(eb, (char *)(result), \
681 ((unsigned long)(ptr)) + \
682 offsetof(type, member), \
683 sizeof(((type *)0)->member)))
685 #ifndef BTRFS_SETGET_FUNCS
686 #define BTRFS_SETGET_FUNCS(name, type, member, bits) \
687 u##bits btrfs_##name(struct extent_buffer *eb, type *s); \
688 void btrfs_set_##name(struct extent_buffer *eb, type *s, u##bits val);
691 #define BTRFS_SETGET_HEADER_FUNCS(name, type, member, bits) \
692 static inline u##bits btrfs_##name(struct extent_buffer *eb) \
694 type *p = kmap_atomic(eb->first_page, KM_USER0); \
695 u##bits res = le##bits##_to_cpu(p->member); \
696 kunmap_atomic(p, KM_USER0); \
699 static inline void btrfs_set_##name(struct extent_buffer *eb, \
702 type *p = kmap_atomic(eb->first_page, KM_USER0); \
703 p->member = cpu_to_le##bits(val); \
704 kunmap_atomic(p, KM_USER0); \
707 #define BTRFS_SETGET_STACK_FUNCS(name, type, member, bits) \
708 static inline u##bits btrfs_##name(type *s) \
710 return le##bits##_to_cpu(s->member); \
712 static inline void btrfs_set_##name(type *s, u##bits val) \
714 s->member = cpu_to_le##bits(val); \
717 BTRFS_SETGET_FUNCS(device_type, struct btrfs_dev_item, type, 64);
718 BTRFS_SETGET_FUNCS(device_total_bytes, struct btrfs_dev_item, total_bytes, 64);
719 BTRFS_SETGET_FUNCS(device_bytes_used, struct btrfs_dev_item, bytes_used, 64);
720 BTRFS_SETGET_FUNCS(device_io_align, struct btrfs_dev_item, io_align, 32);
721 BTRFS_SETGET_FUNCS(device_io_width, struct btrfs_dev_item, io_width, 32);
722 BTRFS_SETGET_FUNCS(device_sector_size, struct btrfs_dev_item, sector_size, 32);
723 BTRFS_SETGET_FUNCS(device_id, struct btrfs_dev_item, devid, 64);
724 BTRFS_SETGET_FUNCS(device_group, struct btrfs_dev_item, dev_group, 32);
725 BTRFS_SETGET_FUNCS(device_seek_speed, struct btrfs_dev_item, seek_speed, 8);
726 BTRFS_SETGET_FUNCS(device_bandwidth, struct btrfs_dev_item, bandwidth, 8);
728 BTRFS_SETGET_STACK_FUNCS(stack_device_type, struct btrfs_dev_item, type, 64);
729 BTRFS_SETGET_STACK_FUNCS(stack_device_total_bytes, struct btrfs_dev_item,
731 BTRFS_SETGET_STACK_FUNCS(stack_device_bytes_used, struct btrfs_dev_item,
733 BTRFS_SETGET_STACK_FUNCS(stack_device_io_align, struct btrfs_dev_item,
735 BTRFS_SETGET_STACK_FUNCS(stack_device_io_width, struct btrfs_dev_item,
737 BTRFS_SETGET_STACK_FUNCS(stack_device_sector_size, struct btrfs_dev_item,
739 BTRFS_SETGET_STACK_FUNCS(stack_device_id, struct btrfs_dev_item, devid, 64);
740 BTRFS_SETGET_STACK_FUNCS(stack_device_group, struct btrfs_dev_item,
742 BTRFS_SETGET_STACK_FUNCS(stack_device_seek_speed, struct btrfs_dev_item,
744 BTRFS_SETGET_STACK_FUNCS(stack_device_bandwidth, struct btrfs_dev_item,
747 static inline char *btrfs_device_uuid(struct btrfs_dev_item *d)
749 return (char *)d + offsetof(struct btrfs_dev_item, uuid);
752 BTRFS_SETGET_FUNCS(chunk_length, struct btrfs_chunk, length, 64);
753 BTRFS_SETGET_FUNCS(chunk_owner, struct btrfs_chunk, owner, 64);
754 BTRFS_SETGET_FUNCS(chunk_stripe_len, struct btrfs_chunk, stripe_len, 64);
755 BTRFS_SETGET_FUNCS(chunk_io_align, struct btrfs_chunk, io_align, 32);
756 BTRFS_SETGET_FUNCS(chunk_io_width, struct btrfs_chunk, io_width, 32);
757 BTRFS_SETGET_FUNCS(chunk_sector_size, struct btrfs_chunk, sector_size, 32);
758 BTRFS_SETGET_FUNCS(chunk_type, struct btrfs_chunk, type, 64);
759 BTRFS_SETGET_FUNCS(chunk_num_stripes, struct btrfs_chunk, num_stripes, 16);
760 BTRFS_SETGET_FUNCS(stripe_devid, struct btrfs_stripe, devid, 64);
761 BTRFS_SETGET_FUNCS(stripe_offset, struct btrfs_stripe, offset, 64);
763 static inline char *btrfs_stripe_dev_uuid(struct btrfs_stripe *s)
765 return (char *)s + offsetof(struct btrfs_stripe, dev_uuid);
768 BTRFS_SETGET_STACK_FUNCS(stack_chunk_length, struct btrfs_chunk, length, 64);
769 BTRFS_SETGET_STACK_FUNCS(stack_chunk_owner, struct btrfs_chunk, owner, 64);
770 BTRFS_SETGET_STACK_FUNCS(stack_chunk_stripe_len, struct btrfs_chunk,
772 BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_align, struct btrfs_chunk,
774 BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_width, struct btrfs_chunk,
776 BTRFS_SETGET_STACK_FUNCS(stack_chunk_sector_size, struct btrfs_chunk,
778 BTRFS_SETGET_STACK_FUNCS(stack_chunk_type, struct btrfs_chunk, type, 64);
779 BTRFS_SETGET_STACK_FUNCS(stack_chunk_num_stripes, struct btrfs_chunk,
781 BTRFS_SETGET_STACK_FUNCS(stack_stripe_devid, struct btrfs_stripe, devid, 64);
782 BTRFS_SETGET_STACK_FUNCS(stack_stripe_offset, struct btrfs_stripe, offset, 64);
784 static inline struct btrfs_stripe *btrfs_stripe_nr(struct btrfs_chunk *c,
787 unsigned long offset = (unsigned long)c;
788 offset += offsetof(struct btrfs_chunk, stripe);
789 offset += nr * sizeof(struct btrfs_stripe);
790 return (struct btrfs_stripe *)offset;
793 static inline u64 btrfs_stripe_offset_nr(struct extent_buffer *eb,
794 struct btrfs_chunk *c, int nr)
796 return btrfs_stripe_offset(eb, btrfs_stripe_nr(c, nr));
799 static inline void btrfs_set_stripe_offset_nr(struct extent_buffer *eb,
800 struct btrfs_chunk *c, int nr,
803 btrfs_set_stripe_offset(eb, btrfs_stripe_nr(c, nr), val);
806 static inline u64 btrfs_stripe_devid_nr(struct extent_buffer *eb,
807 struct btrfs_chunk *c, int nr)
809 return btrfs_stripe_devid(eb, btrfs_stripe_nr(c, nr));
812 static inline void btrfs_set_stripe_devid_nr(struct extent_buffer *eb,
813 struct btrfs_chunk *c, int nr,
816 btrfs_set_stripe_devid(eb, btrfs_stripe_nr(c, nr), val);
819 /* struct btrfs_block_group_item */
820 BTRFS_SETGET_STACK_FUNCS(block_group_used, struct btrfs_block_group_item,
822 BTRFS_SETGET_FUNCS(disk_block_group_used, struct btrfs_block_group_item,
824 BTRFS_SETGET_STACK_FUNCS(block_group_chunk_objectid,
825 struct btrfs_block_group_item, chunk_objectid, 64);
827 BTRFS_SETGET_FUNCS(disk_block_group_chunk_objectid,
828 struct btrfs_block_group_item, chunk_objectid, 64);
829 BTRFS_SETGET_FUNCS(disk_block_group_flags,
830 struct btrfs_block_group_item, flags, 64);
831 BTRFS_SETGET_STACK_FUNCS(block_group_flags,
832 struct btrfs_block_group_item, flags, 64);
834 /* struct btrfs_inode_ref */
835 BTRFS_SETGET_FUNCS(inode_ref_name_len, struct btrfs_inode_ref, name_len, 16);
837 /* struct btrfs_inode_item */
838 BTRFS_SETGET_FUNCS(inode_generation, struct btrfs_inode_item, generation, 64);
839 BTRFS_SETGET_FUNCS(inode_size, struct btrfs_inode_item, size, 64);
840 BTRFS_SETGET_FUNCS(inode_nblocks, struct btrfs_inode_item, nblocks, 64);
841 BTRFS_SETGET_FUNCS(inode_block_group, struct btrfs_inode_item, block_group, 64);
842 BTRFS_SETGET_FUNCS(inode_nlink, struct btrfs_inode_item, nlink, 32);
843 BTRFS_SETGET_FUNCS(inode_uid, struct btrfs_inode_item, uid, 32);
844 BTRFS_SETGET_FUNCS(inode_gid, struct btrfs_inode_item, gid, 32);
845 BTRFS_SETGET_FUNCS(inode_mode, struct btrfs_inode_item, mode, 32);
846 BTRFS_SETGET_FUNCS(inode_rdev, struct btrfs_inode_item, rdev, 64);
847 BTRFS_SETGET_FUNCS(inode_flags, struct btrfs_inode_item, flags, 16);
848 BTRFS_SETGET_FUNCS(inode_compat_flags, struct btrfs_inode_item,
851 static inline struct btrfs_timespec *
852 btrfs_inode_atime(struct btrfs_inode_item *inode_item)
854 unsigned long ptr = (unsigned long)inode_item;
855 ptr += offsetof(struct btrfs_inode_item, atime);
856 return (struct btrfs_timespec *)ptr;
859 static inline struct btrfs_timespec *
860 btrfs_inode_mtime(struct btrfs_inode_item *inode_item)
862 unsigned long ptr = (unsigned long)inode_item;
863 ptr += offsetof(struct btrfs_inode_item, mtime);
864 return (struct btrfs_timespec *)ptr;
867 static inline struct btrfs_timespec *
868 btrfs_inode_ctime(struct btrfs_inode_item *inode_item)
870 unsigned long ptr = (unsigned long)inode_item;
871 ptr += offsetof(struct btrfs_inode_item, ctime);
872 return (struct btrfs_timespec *)ptr;
875 static inline struct btrfs_timespec *
876 btrfs_inode_otime(struct btrfs_inode_item *inode_item)
878 unsigned long ptr = (unsigned long)inode_item;
879 ptr += offsetof(struct btrfs_inode_item, otime);
880 return (struct btrfs_timespec *)ptr;
883 BTRFS_SETGET_FUNCS(timespec_sec, struct btrfs_timespec, sec, 64);
884 BTRFS_SETGET_FUNCS(timespec_nsec, struct btrfs_timespec, nsec, 32);
886 /* struct btrfs_extent_item */
887 BTRFS_SETGET_FUNCS(extent_refs, struct btrfs_extent_item, refs, 32);
889 /* struct btrfs_dev_extent */
890 BTRFS_SETGET_FUNCS(dev_extent_chunk_tree, struct btrfs_dev_extent,
892 BTRFS_SETGET_FUNCS(dev_extent_chunk_objectid, struct btrfs_dev_extent,
894 BTRFS_SETGET_FUNCS(dev_extent_chunk_offset, struct btrfs_dev_extent,
896 BTRFS_SETGET_FUNCS(dev_extent_length, struct btrfs_dev_extent, length, 64);
898 static inline u8 *btrfs_dev_extent_chunk_tree_uuid(struct btrfs_dev_extent *dev)
900 unsigned long ptr = offsetof(struct btrfs_dev_extent, chunk_tree_uuid);
901 return (u8 *)((unsigned long)dev + ptr);
904 /* struct btrfs_extent_ref */
905 BTRFS_SETGET_FUNCS(ref_root, struct btrfs_extent_ref, root, 64);
906 BTRFS_SETGET_FUNCS(ref_generation, struct btrfs_extent_ref, generation, 64);
907 BTRFS_SETGET_FUNCS(ref_objectid, struct btrfs_extent_ref, objectid, 64);
908 BTRFS_SETGET_FUNCS(ref_offset, struct btrfs_extent_ref, offset, 64);
910 BTRFS_SETGET_STACK_FUNCS(stack_ref_root, struct btrfs_extent_ref, root, 64);
911 BTRFS_SETGET_STACK_FUNCS(stack_ref_generation, struct btrfs_extent_ref,
913 BTRFS_SETGET_STACK_FUNCS(stack_ref_objectid, struct btrfs_extent_ref,
915 BTRFS_SETGET_STACK_FUNCS(stack_ref_offset, struct btrfs_extent_ref, offset, 64);
917 BTRFS_SETGET_STACK_FUNCS(stack_extent_refs, struct btrfs_extent_item,
920 /* struct btrfs_node */
921 BTRFS_SETGET_FUNCS(key_blockptr, struct btrfs_key_ptr, blockptr, 64);
922 BTRFS_SETGET_FUNCS(key_generation, struct btrfs_key_ptr, generation, 64);
924 static inline u64 btrfs_node_blockptr(struct extent_buffer *eb, int nr)
927 ptr = offsetof(struct btrfs_node, ptrs) +
928 sizeof(struct btrfs_key_ptr) * nr;
929 return btrfs_key_blockptr(eb, (struct btrfs_key_ptr *)ptr);
932 static inline void btrfs_set_node_blockptr(struct extent_buffer *eb,
936 ptr = offsetof(struct btrfs_node, ptrs) +
937 sizeof(struct btrfs_key_ptr) * nr;
938 btrfs_set_key_blockptr(eb, (struct btrfs_key_ptr *)ptr, val);
941 static inline u64 btrfs_node_ptr_generation(struct extent_buffer *eb, int nr)
944 ptr = offsetof(struct btrfs_node, ptrs) +
945 sizeof(struct btrfs_key_ptr) * nr;
946 return btrfs_key_generation(eb, (struct btrfs_key_ptr *)ptr);
949 static inline void btrfs_set_node_ptr_generation(struct extent_buffer *eb,
953 ptr = offsetof(struct btrfs_node, ptrs) +
954 sizeof(struct btrfs_key_ptr) * nr;
955 btrfs_set_key_generation(eb, (struct btrfs_key_ptr *)ptr, val);
958 static inline unsigned long btrfs_node_key_ptr_offset(int nr)
960 return offsetof(struct btrfs_node, ptrs) +
961 sizeof(struct btrfs_key_ptr) * nr;
964 void btrfs_node_key(struct extent_buffer *eb,
965 struct btrfs_disk_key *disk_key, int nr);
967 static inline void btrfs_set_node_key(struct extent_buffer *eb,
968 struct btrfs_disk_key *disk_key, int nr)
971 ptr = btrfs_node_key_ptr_offset(nr);
972 write_eb_member(eb, (struct btrfs_key_ptr *)ptr,
973 struct btrfs_key_ptr, key, disk_key);
976 /* struct btrfs_item */
977 BTRFS_SETGET_FUNCS(item_offset, struct btrfs_item, offset, 32);
978 BTRFS_SETGET_FUNCS(item_size, struct btrfs_item, size, 32);
980 static inline unsigned long btrfs_item_nr_offset(int nr)
982 return offsetof(struct btrfs_leaf, items) +
983 sizeof(struct btrfs_item) * nr;
986 static inline struct btrfs_item *btrfs_item_nr(struct extent_buffer *eb,
989 return (struct btrfs_item *)btrfs_item_nr_offset(nr);
992 static inline u32 btrfs_item_end(struct extent_buffer *eb,
993 struct btrfs_item *item)
995 return btrfs_item_offset(eb, item) + btrfs_item_size(eb, item);
998 static inline u32 btrfs_item_end_nr(struct extent_buffer *eb, int nr)
1000 return btrfs_item_end(eb, btrfs_item_nr(eb, nr));
1003 static inline u32 btrfs_item_offset_nr(struct extent_buffer *eb, int nr)
1005 return btrfs_item_offset(eb, btrfs_item_nr(eb, nr));
1008 static inline u32 btrfs_item_size_nr(struct extent_buffer *eb, int nr)
1010 return btrfs_item_size(eb, btrfs_item_nr(eb, nr));
1013 static inline void btrfs_item_key(struct extent_buffer *eb,
1014 struct btrfs_disk_key *disk_key, int nr)
1016 struct btrfs_item *item = btrfs_item_nr(eb, nr);
1017 read_eb_member(eb, item, struct btrfs_item, key, disk_key);
1020 static inline void btrfs_set_item_key(struct extent_buffer *eb,
1021 struct btrfs_disk_key *disk_key, int nr)
1023 struct btrfs_item *item = btrfs_item_nr(eb, nr);
1024 write_eb_member(eb, item, struct btrfs_item, key, disk_key);
1027 /* struct btrfs_dir_item */
1028 BTRFS_SETGET_FUNCS(dir_data_len, struct btrfs_dir_item, data_len, 16);
1029 BTRFS_SETGET_FUNCS(dir_type, struct btrfs_dir_item, type, 8);
1030 BTRFS_SETGET_FUNCS(dir_name_len, struct btrfs_dir_item, name_len, 16);
1032 static inline void btrfs_dir_item_key(struct extent_buffer *eb,
1033 struct btrfs_dir_item *item,
1034 struct btrfs_disk_key *key)
1036 read_eb_member(eb, item, struct btrfs_dir_item, location, key);
1039 static inline void btrfs_set_dir_item_key(struct extent_buffer *eb,
1040 struct btrfs_dir_item *item,
1041 struct btrfs_disk_key *key)
1043 write_eb_member(eb, item, struct btrfs_dir_item, location, key);
1046 /* struct btrfs_disk_key */
1047 BTRFS_SETGET_STACK_FUNCS(disk_key_objectid, struct btrfs_disk_key,
1049 BTRFS_SETGET_STACK_FUNCS(disk_key_offset, struct btrfs_disk_key, offset, 64);
1050 BTRFS_SETGET_STACK_FUNCS(disk_key_type, struct btrfs_disk_key, type, 8);
1052 static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu,
1053 struct btrfs_disk_key *disk)
1055 cpu->offset = le64_to_cpu(disk->offset);
1056 cpu->type = disk->type;
1057 cpu->objectid = le64_to_cpu(disk->objectid);
1060 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk,
1061 struct btrfs_key *cpu)
1063 disk->offset = cpu_to_le64(cpu->offset);
1064 disk->type = cpu->type;
1065 disk->objectid = cpu_to_le64(cpu->objectid);
1068 static inline void btrfs_node_key_to_cpu(struct extent_buffer *eb,
1069 struct btrfs_key *key, int nr)
1071 struct btrfs_disk_key disk_key;
1072 btrfs_node_key(eb, &disk_key, nr);
1073 btrfs_disk_key_to_cpu(key, &disk_key);
1076 static inline void btrfs_item_key_to_cpu(struct extent_buffer *eb,
1077 struct btrfs_key *key, int nr)
1079 struct btrfs_disk_key disk_key;
1080 btrfs_item_key(eb, &disk_key, nr);
1081 btrfs_disk_key_to_cpu(key, &disk_key);
1084 static inline void btrfs_dir_item_key_to_cpu(struct extent_buffer *eb,
1085 struct btrfs_dir_item *item,
1086 struct btrfs_key *key)
1088 struct btrfs_disk_key disk_key;
1089 btrfs_dir_item_key(eb, item, &disk_key);
1090 btrfs_disk_key_to_cpu(key, &disk_key);
1094 static inline u8 btrfs_key_type(struct btrfs_key *key)
1099 static inline void btrfs_set_key_type(struct btrfs_key *key, u8 val)
1104 /* struct btrfs_header */
1105 BTRFS_SETGET_HEADER_FUNCS(header_bytenr, struct btrfs_header, bytenr, 64);
1106 BTRFS_SETGET_HEADER_FUNCS(header_generation, struct btrfs_header,
1108 BTRFS_SETGET_HEADER_FUNCS(header_owner, struct btrfs_header, owner, 64);
1109 BTRFS_SETGET_HEADER_FUNCS(header_nritems, struct btrfs_header, nritems, 32);
1110 BTRFS_SETGET_HEADER_FUNCS(header_flags, struct btrfs_header, flags, 64);
1111 BTRFS_SETGET_HEADER_FUNCS(header_level, struct btrfs_header, level, 8);
1113 static inline int btrfs_header_flag(struct extent_buffer *eb, u64 flag)
1115 return (btrfs_header_flags(eb) & flag) == flag;
1118 static inline int btrfs_set_header_flag(struct extent_buffer *eb, u64 flag)
1120 u64 flags = btrfs_header_flags(eb);
1121 btrfs_set_header_flags(eb, flags | flag);
1122 return (flags & flag) == flag;
1125 static inline int btrfs_clear_header_flag(struct extent_buffer *eb, u64 flag)
1127 u64 flags = btrfs_header_flags(eb);
1128 btrfs_set_header_flags(eb, flags & ~flag);
1129 return (flags & flag) == flag;
1132 static inline u8 *btrfs_header_fsid(struct extent_buffer *eb)
1134 unsigned long ptr = offsetof(struct btrfs_header, fsid);
1138 static inline u8 *btrfs_header_chunk_tree_uuid(struct extent_buffer *eb)
1140 unsigned long ptr = offsetof(struct btrfs_header, chunk_tree_uuid);
1144 static inline u8 *btrfs_super_fsid(struct extent_buffer *eb)
1146 unsigned long ptr = offsetof(struct btrfs_super_block, fsid);
1150 static inline u8 *btrfs_header_csum(struct extent_buffer *eb)
1152 unsigned long ptr = offsetof(struct btrfs_header, csum);
1156 static inline struct btrfs_node *btrfs_buffer_node(struct extent_buffer *eb)
1161 static inline struct btrfs_leaf *btrfs_buffer_leaf(struct extent_buffer *eb)
1166 static inline struct btrfs_header *btrfs_buffer_header(struct extent_buffer *eb)
1171 static inline int btrfs_is_leaf(struct extent_buffer *eb)
1173 return (btrfs_header_level(eb) == 0);
1176 /* struct btrfs_root_item */
1177 BTRFS_SETGET_FUNCS(disk_root_refs, struct btrfs_root_item, refs, 32);
1178 BTRFS_SETGET_FUNCS(disk_root_bytenr, struct btrfs_root_item, bytenr, 64);
1179 BTRFS_SETGET_FUNCS(disk_root_level, struct btrfs_root_item, level, 8);
1181 BTRFS_SETGET_STACK_FUNCS(root_bytenr, struct btrfs_root_item, bytenr, 64);
1182 BTRFS_SETGET_STACK_FUNCS(root_level, struct btrfs_root_item, level, 8);
1183 BTRFS_SETGET_STACK_FUNCS(root_dirid, struct btrfs_root_item, root_dirid, 64);
1184 BTRFS_SETGET_STACK_FUNCS(root_refs, struct btrfs_root_item, refs, 32);
1185 BTRFS_SETGET_STACK_FUNCS(root_flags, struct btrfs_root_item, flags, 32);
1186 BTRFS_SETGET_STACK_FUNCS(root_used, struct btrfs_root_item, bytes_used, 64);
1187 BTRFS_SETGET_STACK_FUNCS(root_limit, struct btrfs_root_item, byte_limit, 64);
1189 /* struct btrfs_super_block */
1190 BTRFS_SETGET_STACK_FUNCS(super_bytenr, struct btrfs_super_block, bytenr, 64);
1191 BTRFS_SETGET_STACK_FUNCS(super_generation, struct btrfs_super_block,
1193 BTRFS_SETGET_STACK_FUNCS(super_root, struct btrfs_super_block, root, 64);
1194 BTRFS_SETGET_STACK_FUNCS(super_sys_array_size,
1195 struct btrfs_super_block, sys_chunk_array_size, 32);
1196 BTRFS_SETGET_STACK_FUNCS(super_root_level, struct btrfs_super_block,
1198 BTRFS_SETGET_STACK_FUNCS(super_chunk_root, struct btrfs_super_block,
1200 BTRFS_SETGET_STACK_FUNCS(super_chunk_root_level, struct btrfs_super_block,
1201 chunk_root_level, 64);
1202 BTRFS_SETGET_STACK_FUNCS(super_total_bytes, struct btrfs_super_block,
1204 BTRFS_SETGET_STACK_FUNCS(super_bytes_used, struct btrfs_super_block,
1206 BTRFS_SETGET_STACK_FUNCS(super_sectorsize, struct btrfs_super_block,
1208 BTRFS_SETGET_STACK_FUNCS(super_nodesize, struct btrfs_super_block,
1210 BTRFS_SETGET_STACK_FUNCS(super_leafsize, struct btrfs_super_block,
1212 BTRFS_SETGET_STACK_FUNCS(super_stripesize, struct btrfs_super_block,
1214 BTRFS_SETGET_STACK_FUNCS(super_root_dir, struct btrfs_super_block,
1215 root_dir_objectid, 64);
1216 BTRFS_SETGET_STACK_FUNCS(super_num_devices, struct btrfs_super_block,
1219 static inline unsigned long btrfs_leaf_data(struct extent_buffer *l)
1221 return offsetof(struct btrfs_leaf, items);
1224 /* struct btrfs_file_extent_item */
1225 BTRFS_SETGET_FUNCS(file_extent_type, struct btrfs_file_extent_item, type, 8);
1227 static inline unsigned long btrfs_file_extent_inline_start(struct
1228 btrfs_file_extent_item *e)
1230 unsigned long offset = (unsigned long)e;
1231 offset += offsetof(struct btrfs_file_extent_item, disk_bytenr);
1235 static inline u32 btrfs_file_extent_calc_inline_size(u32 datasize)
1237 return offsetof(struct btrfs_file_extent_item, disk_bytenr) + datasize;
1240 static inline u32 btrfs_file_extent_inline_len(struct extent_buffer *eb,
1241 struct btrfs_item *e)
1243 unsigned long offset;
1244 offset = offsetof(struct btrfs_file_extent_item, disk_bytenr);
1245 return btrfs_item_size(eb, e) - offset;
1248 BTRFS_SETGET_FUNCS(file_extent_disk_bytenr, struct btrfs_file_extent_item,
1250 BTRFS_SETGET_FUNCS(file_extent_generation, struct btrfs_file_extent_item,
1252 BTRFS_SETGET_FUNCS(file_extent_disk_num_bytes, struct btrfs_file_extent_item,
1253 disk_num_bytes, 64);
1254 BTRFS_SETGET_FUNCS(file_extent_offset, struct btrfs_file_extent_item,
1256 BTRFS_SETGET_FUNCS(file_extent_num_bytes, struct btrfs_file_extent_item,
1259 static inline struct btrfs_root *btrfs_sb(struct super_block *sb)
1261 return sb->s_fs_info;
1264 static inline int btrfs_set_root_name(struct btrfs_root *root,
1265 const char *name, int len)
1267 /* if we already have a name just free it */
1271 root->name = kmalloc(len+1, GFP_KERNEL);
1275 memcpy(root->name, name, len);
1276 root->name[len] ='\0';
1281 static inline u32 btrfs_level_size(struct btrfs_root *root, int level) {
1283 return root->leafsize;
1284 return root->nodesize;
1287 /* helper function to cast into the data area of the leaf. */
1288 #define btrfs_item_ptr(leaf, slot, type) \
1289 ((type *)(btrfs_leaf_data(leaf) + \
1290 btrfs_item_offset_nr(leaf, slot)))
1292 #define btrfs_item_ptr_offset(leaf, slot) \
1293 ((unsigned long)(btrfs_leaf_data(leaf) + \
1294 btrfs_item_offset_nr(leaf, slot)))
1296 static inline struct dentry *fdentry(struct file *file) {
1297 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
1298 return file->f_dentry;
1300 return file->f_path.dentry;
1305 u32 btrfs_count_snapshots_in_path(struct btrfs_root *root,
1306 struct btrfs_path *count_path,
1308 int btrfs_extent_post_op(struct btrfs_trans_handle *trans,
1309 struct btrfs_root *root);
1310 int btrfs_copy_pinned(struct btrfs_root *root, struct extent_io_tree *copy);
1311 struct btrfs_block_group_cache *btrfs_lookup_block_group(struct
1312 btrfs_fs_info *info,
1314 struct btrfs_block_group_cache *btrfs_find_block_group(struct btrfs_root *root,
1315 struct btrfs_block_group_cache
1316 *hint, u64 search_start,
1317 int data, int owner);
1318 int btrfs_inc_root_ref(struct btrfs_trans_handle *trans,
1319 struct btrfs_root *root, u64 owner_objectid);
1320 struct extent_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
1321 struct btrfs_root *root, u32 size,
1323 u64 hint, u64 empty_size);
1324 struct extent_buffer *__btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
1325 struct btrfs_root *root,
1333 int btrfs_grow_extent_tree(struct btrfs_trans_handle *trans,
1334 struct btrfs_root *root, u64 new_size);
1335 int btrfs_shrink_extent_tree(struct btrfs_root *root, u64 new_size);
1336 int btrfs_insert_extent_backref(struct btrfs_trans_handle *trans,
1337 struct btrfs_root *root,
1338 struct btrfs_path *path, u64 bytenr,
1339 u64 root_objectid, u64 ref_generation,
1340 u64 owner, u64 owner_offset);
1341 int btrfs_alloc_extent(struct btrfs_trans_handle *trans,
1342 struct btrfs_root *root,
1343 u64 num_bytes, u64 min_bytes,
1344 u64 root_objectid, u64 ref_generation,
1345 u64 owner, u64 owner_offset,
1346 u64 empty_size, u64 hint_byte,
1347 u64 search_end, struct btrfs_key *ins, int data);
1348 int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1349 struct extent_buffer *buf);
1350 int btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
1351 *root, u64 bytenr, u64 num_bytes,
1352 u64 root_objectid, u64 ref_generation,
1353 u64 owner_objectid, u64 owner_offset, int pin);
1354 int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans,
1355 struct btrfs_root *root,
1356 struct extent_io_tree *unpin);
1357 int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
1358 struct btrfs_root *root,
1359 u64 bytenr, u64 num_bytes,
1360 u64 root_objectid, u64 ref_generation,
1361 u64 owner, u64 owner_offset);
1362 int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans,
1363 struct btrfs_root *root);
1364 int btrfs_free_block_groups(struct btrfs_fs_info *info);
1365 int btrfs_read_block_groups(struct btrfs_root *root);
1366 int btrfs_make_block_group(struct btrfs_trans_handle *trans,
1367 struct btrfs_root *root, u64 bytes_used,
1368 u64 type, u64 chunk_objectid, u64 chunk_offset,
1371 int btrfs_previous_item(struct btrfs_root *root,
1372 struct btrfs_path *path, u64 min_objectid,
1374 int btrfs_cow_block(struct btrfs_trans_handle *trans,
1375 struct btrfs_root *root, struct extent_buffer *buf,
1376 struct extent_buffer *parent, int parent_slot,
1377 struct extent_buffer **cow_ret);
1378 int btrfs_copy_root(struct btrfs_trans_handle *trans,
1379 struct btrfs_root *root,
1380 struct extent_buffer *buf,
1381 struct extent_buffer **cow_ret, u64 new_root_objectid);
1382 int btrfs_extend_item(struct btrfs_trans_handle *trans, struct btrfs_root
1383 *root, struct btrfs_path *path, u32 data_size);
1384 int btrfs_truncate_item(struct btrfs_trans_handle *trans,
1385 struct btrfs_root *root,
1386 struct btrfs_path *path,
1387 u32 new_size, int from_end);
1388 int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root
1389 *root, struct btrfs_key *key, struct btrfs_path *p, int
1391 int btrfs_realloc_node(struct btrfs_trans_handle *trans,
1392 struct btrfs_root *root, struct extent_buffer *parent,
1393 int start_slot, int cache_only, u64 *last_ret,
1394 struct btrfs_key *progress);
1395 void btrfs_release_path(struct btrfs_root *root, struct btrfs_path *p);
1396 struct btrfs_path *btrfs_alloc_path(void);
1397 void btrfs_free_path(struct btrfs_path *p);
1398 void btrfs_init_path(struct btrfs_path *p);
1399 int btrfs_del_items(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1400 struct btrfs_path *path, int slot, int nr);
1402 static inline int btrfs_del_item(struct btrfs_trans_handle *trans,
1403 struct btrfs_root *root,
1404 struct btrfs_path *path)
1406 return btrfs_del_items(trans, root, path, path->slots[0], 1);
1409 int btrfs_insert_item(struct btrfs_trans_handle *trans, struct btrfs_root
1410 *root, struct btrfs_key *key, void *data, u32 data_size);
1411 int btrfs_insert_empty_items(struct btrfs_trans_handle *trans,
1412 struct btrfs_root *root,
1413 struct btrfs_path *path,
1414 struct btrfs_key *cpu_key, u32 *data_size, int nr);
1416 static inline int btrfs_insert_empty_item(struct btrfs_trans_handle *trans,
1417 struct btrfs_root *root,
1418 struct btrfs_path *path,
1419 struct btrfs_key *key,
1422 return btrfs_insert_empty_items(trans, root, path, key, &data_size, 1);
1425 int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path);
1426 int btrfs_prev_leaf(struct btrfs_root *root, struct btrfs_path *path);
1427 int btrfs_leaf_free_space(struct btrfs_root *root, struct extent_buffer *leaf);
1428 int btrfs_drop_snapshot(struct btrfs_trans_handle *trans, struct btrfs_root
1431 int btrfs_del_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1432 struct btrfs_key *key);
1433 int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root
1434 *root, struct btrfs_key *key, struct btrfs_root_item
1436 int btrfs_update_root(struct btrfs_trans_handle *trans, struct btrfs_root
1437 *root, struct btrfs_key *key, struct btrfs_root_item
1439 int btrfs_find_last_root(struct btrfs_root *root, u64 objectid, struct
1440 btrfs_root_item *item, struct btrfs_key *key);
1441 int btrfs_find_dead_roots(struct btrfs_root *root, u64 objectid,
1442 struct btrfs_root *latest_root);
1444 int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
1445 *root, const char *name, int name_len, u64 dir,
1446 struct btrfs_key *location, u8 type);
1447 struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans,
1448 struct btrfs_root *root,
1449 struct btrfs_path *path, u64 dir,
1450 const char *name, int name_len,
1452 struct btrfs_dir_item *
1453 btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans,
1454 struct btrfs_root *root,
1455 struct btrfs_path *path, u64 dir,
1456 u64 objectid, const char *name, int name_len,
1458 struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_root *root,
1459 struct btrfs_path *path,
1460 const char *name, int name_len);
1461 int btrfs_delete_one_dir_name(struct btrfs_trans_handle *trans,
1462 struct btrfs_root *root,
1463 struct btrfs_path *path,
1464 struct btrfs_dir_item *di);
1465 int btrfs_insert_xattr_item(struct btrfs_trans_handle *trans,
1466 struct btrfs_root *root, const char *name,
1467 u16 name_len, const void *data, u16 data_len,
1469 struct btrfs_dir_item *btrfs_lookup_xattr(struct btrfs_trans_handle *trans,
1470 struct btrfs_root *root,
1471 struct btrfs_path *path, u64 dir,
1472 const char *name, u16 name_len,
1475 int btrfs_find_free_objectid(struct btrfs_trans_handle *trans,
1476 struct btrfs_root *fs_root,
1477 u64 dirid, u64 *objectid);
1478 int btrfs_find_highest_inode(struct btrfs_root *fs_root, u64 *objectid);
1481 int btrfs_insert_inode_ref(struct btrfs_trans_handle *trans,
1482 struct btrfs_root *root,
1483 const char *name, int name_len,
1484 u64 inode_objectid, u64 ref_objectid);
1485 int btrfs_del_inode_ref(struct btrfs_trans_handle *trans,
1486 struct btrfs_root *root,
1487 const char *name, int name_len,
1488 u64 inode_objectid, u64 ref_objectid);
1489 int btrfs_insert_empty_inode(struct btrfs_trans_handle *trans,
1490 struct btrfs_root *root,
1491 struct btrfs_path *path, u64 objectid);
1492 int btrfs_lookup_inode(struct btrfs_trans_handle *trans, struct btrfs_root
1493 *root, struct btrfs_path *path,
1494 struct btrfs_key *location, int mod);
1497 int btrfs_insert_file_extent(struct btrfs_trans_handle *trans,
1498 struct btrfs_root *root,
1499 u64 objectid, u64 pos, u64 offset,
1502 int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
1503 struct btrfs_root *root,
1504 struct btrfs_path *path, u64 objectid,
1505 u64 bytenr, int mod);
1506 int btrfs_csum_file_blocks(struct btrfs_trans_handle *trans,
1507 struct btrfs_root *root, struct inode *inode,
1509 struct btrfs_csum_item *btrfs_lookup_csum(struct btrfs_trans_handle *trans,
1510 struct btrfs_root *root,
1511 struct btrfs_path *path,
1512 u64 objectid, u64 offset,
1514 int btrfs_csum_truncate(struct btrfs_trans_handle *trans,
1515 struct btrfs_root *root, struct btrfs_path *path,
1518 int btrfs_merge_bio_hook(struct page *page, unsigned long offset,
1519 size_t size, struct bio *bio);
1521 static inline void dec_i_blocks(struct inode *inode, u64 dec)
1524 if (dec <= inode->i_blocks)
1525 inode->i_blocks -= dec;
1527 inode->i_blocks = 0;
1530 unsigned long btrfs_force_ra(struct address_space *mapping,
1531 struct file_ra_state *ra, struct file *file,
1532 pgoff_t offset, pgoff_t last_index);
1533 int btrfs_check_free_space(struct btrfs_root *root, u64 num_required,
1535 int btrfs_page_mkwrite(struct vm_area_struct *vma, struct page *page);
1536 int btrfs_readpage(struct file *file, struct page *page);
1537 void btrfs_delete_inode(struct inode *inode);
1538 void btrfs_put_inode(struct inode *inode);
1539 void btrfs_read_locked_inode(struct inode *inode);
1540 int btrfs_write_inode(struct inode *inode, int wait);
1541 void btrfs_dirty_inode(struct inode *inode);
1542 struct inode *btrfs_alloc_inode(struct super_block *sb);
1543 void btrfs_destroy_inode(struct inode *inode);
1544 int btrfs_init_cachep(void);
1545 void btrfs_destroy_cachep(void);
1546 long btrfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
1547 struct inode *btrfs_iget_locked(struct super_block *s, u64 objectid,
1548 struct btrfs_root *root);
1549 struct inode *btrfs_ilookup(struct super_block *s, u64 objectid,
1551 int btrfs_commit_write(struct file *file, struct page *page,
1552 unsigned from, unsigned to);
1553 struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page,
1554 size_t page_offset, u64 start, u64 end,
1556 int btrfs_update_inode(struct btrfs_trans_handle *trans,
1557 struct btrfs_root *root,
1558 struct inode *inode);
1560 int btrfs_drop_extent_cache(struct inode *inode, u64 start, u64 end);
1561 int btrfs_check_file(struct btrfs_root *root, struct inode *inode);
1562 extern struct file_operations btrfs_file_operations;
1563 int btrfs_drop_extents(struct btrfs_trans_handle *trans,
1564 struct btrfs_root *root, struct inode *inode,
1565 u64 start, u64 end, u64 inline_limit, u64 *hint_block);
1567 int btrfs_defrag_leaves(struct btrfs_trans_handle *trans,
1568 struct btrfs_root *root, int cache_only);
1571 int btrfs_init_sysfs(void);
1572 void btrfs_exit_sysfs(void);
1573 int btrfs_sysfs_add_super(struct btrfs_fs_info *fs);
1574 int btrfs_sysfs_add_root(struct btrfs_root *root);
1575 void btrfs_sysfs_del_root(struct btrfs_root *root);
1576 void btrfs_sysfs_del_super(struct btrfs_fs_info *root);
1579 ssize_t btrfs_listxattr(struct dentry *dentry, char *buffer, size_t size);
1580 int btrfs_delete_xattrs(struct btrfs_trans_handle *trans,
1581 struct btrfs_root *root, struct inode *inode);
1583 u64 btrfs_parse_size(char *str);