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/completion.h>
27 #include <linux/backing-dev.h>
28 #include <linux/wait.h>
29 #include <asm/kmap_types.h>
30 #include "extent_io.h"
31 #include "extent_map.h"
32 #include "async-thread.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;
40 struct btrfs_ordered_sum;
42 #define BTRFS_MAGIC "_BHRfS_M"
44 #define BTRFS_MAX_LEVEL 8
46 #define BTRFS_COMPAT_EXTENT_TREE_V0
49 * files bigger than this get some pre-flushing when they are added
50 * to the ordered operations list. That way we limit the total
51 * work done by the commit
53 #define BTRFS_ORDERED_OPERATIONS_FLUSH_LIMIT (8 * 1024 * 1024)
55 /* holds pointers to all of the tree roots */
56 #define BTRFS_ROOT_TREE_OBJECTID 1ULL
58 /* stores information about which extents are in use, and reference counts */
59 #define BTRFS_EXTENT_TREE_OBJECTID 2ULL
62 * chunk tree stores translations from logical -> physical block numbering
63 * the super block points to the chunk tree
65 #define BTRFS_CHUNK_TREE_OBJECTID 3ULL
68 * stores information about which areas of a given device are in use.
69 * one per device. The tree of tree roots points to the device tree
71 #define BTRFS_DEV_TREE_OBJECTID 4ULL
73 /* one per subvolume, storing files and directories */
74 #define BTRFS_FS_TREE_OBJECTID 5ULL
76 /* directory objectid inside the root tree */
77 #define BTRFS_ROOT_TREE_DIR_OBJECTID 6ULL
79 /* holds checksums of all the data extents */
80 #define BTRFS_CSUM_TREE_OBJECTID 7ULL
82 /* orhpan objectid for tracking unlinked/truncated files */
83 #define BTRFS_ORPHAN_OBJECTID -5ULL
85 /* does write ahead logging to speed up fsyncs */
86 #define BTRFS_TREE_LOG_OBJECTID -6ULL
87 #define BTRFS_TREE_LOG_FIXUP_OBJECTID -7ULL
89 /* for space balancing */
90 #define BTRFS_TREE_RELOC_OBJECTID -8ULL
91 #define BTRFS_DATA_RELOC_TREE_OBJECTID -9ULL
94 * extent checksums all have this objectid
95 * this allows them to share the logging tree
98 #define BTRFS_EXTENT_CSUM_OBJECTID -10ULL
100 /* dummy objectid represents multiple objectids */
101 #define BTRFS_MULTIPLE_OBJECTIDS -255ULL
104 * All files have objectids in this range.
106 #define BTRFS_FIRST_FREE_OBJECTID 256ULL
107 #define BTRFS_LAST_FREE_OBJECTID -256ULL
108 #define BTRFS_FIRST_CHUNK_TREE_OBJECTID 256ULL
112 * the device items go into the chunk tree. The key is in the form
113 * [ 1 BTRFS_DEV_ITEM_KEY device_id ]
115 #define BTRFS_DEV_ITEMS_OBJECTID 1ULL
117 #define BTRFS_BTREE_INODE_OBJECTID 1
119 #define BTRFS_EMPTY_SUBVOL_DIR_OBJECTID 2
122 * we can actually store much bigger names, but lets not confuse the rest
125 #define BTRFS_NAME_LEN 255
127 /* 32 bytes in various csum fields */
128 #define BTRFS_CSUM_SIZE 32
131 #define BTRFS_CSUM_TYPE_CRC32 0
133 static int btrfs_csum_sizes[] = { 4, 0 };
135 /* four bytes for CRC32 */
136 #define BTRFS_EMPTY_DIR_SIZE 0
138 #define BTRFS_FT_UNKNOWN 0
139 #define BTRFS_FT_REG_FILE 1
140 #define BTRFS_FT_DIR 2
141 #define BTRFS_FT_CHRDEV 3
142 #define BTRFS_FT_BLKDEV 4
143 #define BTRFS_FT_FIFO 5
144 #define BTRFS_FT_SOCK 6
145 #define BTRFS_FT_SYMLINK 7
146 #define BTRFS_FT_XATTR 8
147 #define BTRFS_FT_MAX 9
150 * The key defines the order in the tree, and so it also defines (optimal)
153 * objectid corresponds to the inode number.
155 * type tells us things about the object, and is a kind of stream selector.
156 * so for a given inode, keys with type of 1 might refer to the inode data,
157 * type of 2 may point to file data in the btree and type == 3 may point to
160 * offset is the starting byte offset for this key in the stream.
162 * btrfs_disk_key is in disk byte order. struct btrfs_key is always
163 * in cpu native order. Otherwise they are identical and their sizes
164 * should be the same (ie both packed)
166 struct btrfs_disk_key {
170 } __attribute__ ((__packed__));
176 } __attribute__ ((__packed__));
178 struct btrfs_mapping_tree {
179 struct extent_map_tree map_tree;
182 #define BTRFS_UUID_SIZE 16
183 struct btrfs_dev_item {
184 /* the internal btrfs device id */
187 /* size of the device */
193 /* optimal io alignment for this device */
196 /* optimal io width for this device */
199 /* minimal io size for this device */
202 /* type and info about this device */
205 /* expected generation for this device */
209 * starting byte of this partition on the device,
210 * to allow for stripe alignment in the future
214 /* grouping information for allocation decisions */
217 /* seek speed 0-100 where 100 is fastest */
220 /* bandwidth 0-100 where 100 is fastest */
223 /* btrfs generated uuid for this device */
224 u8 uuid[BTRFS_UUID_SIZE];
226 /* uuid of FS who owns this device */
227 u8 fsid[BTRFS_UUID_SIZE];
228 } __attribute__ ((__packed__));
230 struct btrfs_stripe {
233 u8 dev_uuid[BTRFS_UUID_SIZE];
234 } __attribute__ ((__packed__));
237 /* size of this chunk in bytes */
240 /* objectid of the root referencing this chunk */
246 /* optimal io alignment for this chunk */
249 /* optimal io width for this chunk */
252 /* minimal io size for this chunk */
255 /* 2^16 stripes is quite a lot, a second limit is the size of a single
260 /* sub stripes only matter for raid10 */
262 struct btrfs_stripe stripe;
263 /* additional stripes go here */
264 } __attribute__ ((__packed__));
266 static inline unsigned long btrfs_chunk_item_size(int num_stripes)
268 BUG_ON(num_stripes == 0);
269 return sizeof(struct btrfs_chunk) +
270 sizeof(struct btrfs_stripe) * (num_stripes - 1);
273 #define BTRFS_FSID_SIZE 16
274 #define BTRFS_HEADER_FLAG_WRITTEN (1ULL << 0)
275 #define BTRFS_HEADER_FLAG_RELOC (1ULL << 1)
276 #define BTRFS_SUPER_FLAG_SEEDING (1ULL << 32)
277 #define BTRFS_SUPER_FLAG_METADUMP (1ULL << 33)
279 #define BTRFS_BACKREF_REV_MAX 256
280 #define BTRFS_BACKREF_REV_SHIFT 56
281 #define BTRFS_BACKREF_REV_MASK (((u64)BTRFS_BACKREF_REV_MAX - 1) << \
282 BTRFS_BACKREF_REV_SHIFT)
284 #define BTRFS_OLD_BACKREF_REV 0
285 #define BTRFS_MIXED_BACKREF_REV 1
288 * every tree block (leaf or node) starts with this header.
290 struct btrfs_header {
291 /* these first four must match the super block */
292 u8 csum[BTRFS_CSUM_SIZE];
293 u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
294 __le64 bytenr; /* which block this node is supposed to live in */
297 /* allowed to be different from the super from here on down */
298 u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
303 } __attribute__ ((__packed__));
305 #define BTRFS_NODEPTRS_PER_BLOCK(r) (((r)->nodesize - \
306 sizeof(struct btrfs_header)) / \
307 sizeof(struct btrfs_key_ptr))
308 #define __BTRFS_LEAF_DATA_SIZE(bs) ((bs) - sizeof(struct btrfs_header))
309 #define BTRFS_LEAF_DATA_SIZE(r) (__BTRFS_LEAF_DATA_SIZE(r->leafsize))
310 #define BTRFS_MAX_INLINE_DATA_SIZE(r) (BTRFS_LEAF_DATA_SIZE(r) - \
311 sizeof(struct btrfs_item) - \
312 sizeof(struct btrfs_file_extent_item))
316 * this is a very generous portion of the super block, giving us
317 * room to translate 14 chunks with 3 stripes each.
319 #define BTRFS_SYSTEM_CHUNK_ARRAY_SIZE 2048
320 #define BTRFS_LABEL_SIZE 256
323 * the super block basically lists the main trees of the FS
324 * it currently lacks any block count etc etc
326 struct btrfs_super_block {
327 u8 csum[BTRFS_CSUM_SIZE];
328 /* the first 4 fields must match struct btrfs_header */
329 u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
330 __le64 bytenr; /* this block number */
333 /* allowed to be different from the btrfs_header from here own down */
340 /* this will help find the new super based on the log root */
341 __le64 log_root_transid;
344 __le64 root_dir_objectid;
350 __le32 sys_chunk_array_size;
351 __le64 chunk_root_generation;
353 __le64 compat_ro_flags;
354 __le64 incompat_flags;
359 struct btrfs_dev_item dev_item;
361 char label[BTRFS_LABEL_SIZE];
363 /* future expansion */
365 u8 sys_chunk_array[BTRFS_SYSTEM_CHUNK_ARRAY_SIZE];
366 } __attribute__ ((__packed__));
369 * Compat flags that we support. If any incompat flags are set other than the
370 * ones specified below then we will fail to mount
372 #define BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF (1ULL << 0)
374 #define BTRFS_FEATURE_COMPAT_SUPP 0ULL
375 #define BTRFS_FEATURE_COMPAT_RO_SUPP 0ULL
376 #define BTRFS_FEATURE_INCOMPAT_SUPP \
377 BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF
380 * A leaf is full of items. offset and size tell us where to find
381 * the item in the leaf (relative to the start of the data area)
384 struct btrfs_disk_key key;
387 } __attribute__ ((__packed__));
390 * leaves have an item area and a data area:
391 * [item0, item1....itemN] [free space] [dataN...data1, data0]
393 * The data is separate from the items to get the keys closer together
397 struct btrfs_header header;
398 struct btrfs_item items[];
399 } __attribute__ ((__packed__));
402 * all non-leaf blocks are nodes, they hold only keys and pointers to
405 struct btrfs_key_ptr {
406 struct btrfs_disk_key key;
409 } __attribute__ ((__packed__));
412 struct btrfs_header header;
413 struct btrfs_key_ptr ptrs[];
414 } __attribute__ ((__packed__));
417 * btrfs_paths remember the path taken from the root down to the leaf.
418 * level 0 is always the leaf, and nodes[1...BTRFS_MAX_LEVEL] will point
419 * to any other levels that are present.
421 * The slots array records the index of the item or block pointer
422 * used while walking the tree.
425 struct extent_buffer *nodes[BTRFS_MAX_LEVEL];
426 int slots[BTRFS_MAX_LEVEL];
427 /* if there is real range locking, this locks field will change */
428 int locks[BTRFS_MAX_LEVEL];
430 /* keep some upper locks as we walk down */
434 * set by btrfs_split_item, tells search_slot to keep all locks
435 * and to force calls to keep space in the nodes
437 unsigned int search_for_split:1;
438 unsigned int keep_locks:1;
439 unsigned int skip_locking:1;
440 unsigned int leave_spinning:1;
441 unsigned int search_commit_root:1;
445 * items in the extent btree are used to record the objectid of the
446 * owner of the block and the number of references
449 struct btrfs_extent_item {
453 } __attribute__ ((__packed__));
455 struct btrfs_extent_item_v0 {
457 } __attribute__ ((__packed__));
459 #define BTRFS_MAX_EXTENT_ITEM_SIZE(r) ((BTRFS_LEAF_DATA_SIZE(r) >> 4) - \
460 sizeof(struct btrfs_item))
462 #define BTRFS_EXTENT_FLAG_DATA (1ULL << 0)
463 #define BTRFS_EXTENT_FLAG_TREE_BLOCK (1ULL << 1)
465 /* following flags only apply to tree blocks */
467 /* use full backrefs for extent pointers in the block */
468 #define BTRFS_BLOCK_FLAG_FULL_BACKREF (1ULL << 8)
470 struct btrfs_tree_block_info {
471 struct btrfs_disk_key key;
473 } __attribute__ ((__packed__));
475 struct btrfs_extent_data_ref {
480 } __attribute__ ((__packed__));
482 struct btrfs_shared_data_ref {
484 } __attribute__ ((__packed__));
486 struct btrfs_extent_inline_ref {
489 } __attribute__ ((__packed__));
491 /* old style backrefs item */
492 struct btrfs_extent_ref_v0 {
497 } __attribute__ ((__packed__));
500 /* dev extents record free space on individual devices. The owner
501 * field points back to the chunk allocation mapping tree that allocated
502 * the extent. The chunk tree uuid field is a way to double check the owner
504 struct btrfs_dev_extent {
506 __le64 chunk_objectid;
509 u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
510 } __attribute__ ((__packed__));
512 struct btrfs_inode_ref {
516 } __attribute__ ((__packed__));
518 struct btrfs_timespec {
521 } __attribute__ ((__packed__));
523 enum btrfs_compression_type {
524 BTRFS_COMPRESS_NONE = 0,
525 BTRFS_COMPRESS_ZLIB = 1,
526 BTRFS_COMPRESS_LAST = 2,
529 struct btrfs_inode_item {
530 /* nfs style generation number */
532 /* transid that last touched this inode */
544 /* modification sequence number for NFS */
548 * a little future expansion, for more than this we can
549 * just grow the inode item and version it
552 struct btrfs_timespec atime;
553 struct btrfs_timespec ctime;
554 struct btrfs_timespec mtime;
555 struct btrfs_timespec otime;
556 } __attribute__ ((__packed__));
558 struct btrfs_dir_log_item {
560 } __attribute__ ((__packed__));
562 struct btrfs_dir_item {
563 struct btrfs_disk_key location;
568 } __attribute__ ((__packed__));
570 struct btrfs_root_item {
571 struct btrfs_inode_item inode;
577 __le64 last_snapshot;
580 struct btrfs_disk_key drop_progress;
583 } __attribute__ ((__packed__));
586 * this is used for both forward and backward root refs
588 struct btrfs_root_ref {
592 } __attribute__ ((__packed__));
594 #define BTRFS_FILE_EXTENT_INLINE 0
595 #define BTRFS_FILE_EXTENT_REG 1
596 #define BTRFS_FILE_EXTENT_PREALLOC 2
598 struct btrfs_file_extent_item {
600 * transaction id that created this extent
604 * max number of bytes to hold this extent in ram
605 * when we split a compressed extent we can't know how big
606 * each of the resulting pieces will be. So, this is
607 * an upper limit on the size of the extent in ram instead of
613 * 32 bits for the various ways we might encode the data,
614 * including compression and encryption. If any of these
615 * are set to something a given disk format doesn't understand
616 * it is treated like an incompat flag for reading and writing,
621 __le16 other_encoding; /* spare for later use */
623 /* are we inline data or a real extent? */
627 * disk space consumed by the extent, checksum blocks are included
631 __le64 disk_num_bytes;
633 * the logical offset in file blocks (no csums)
634 * this extent record is for. This allows a file extent to point
635 * into the middle of an existing extent on disk, sharing it
636 * between two snapshots (useful if some bytes in the middle of the
637 * extent have changed
641 * the logical number of file blocks (no csums included). This
642 * always reflects the size uncompressed and without encoding.
646 } __attribute__ ((__packed__));
648 struct btrfs_csum_item {
650 } __attribute__ ((__packed__));
652 /* different types of block groups (and chunks) */
653 #define BTRFS_BLOCK_GROUP_DATA (1 << 0)
654 #define BTRFS_BLOCK_GROUP_SYSTEM (1 << 1)
655 #define BTRFS_BLOCK_GROUP_METADATA (1 << 2)
656 #define BTRFS_BLOCK_GROUP_RAID0 (1 << 3)
657 #define BTRFS_BLOCK_GROUP_RAID1 (1 << 4)
658 #define BTRFS_BLOCK_GROUP_DUP (1 << 5)
659 #define BTRFS_BLOCK_GROUP_RAID10 (1 << 6)
661 struct btrfs_block_group_item {
663 __le64 chunk_objectid;
665 } __attribute__ ((__packed__));
667 struct btrfs_space_info {
670 u64 total_bytes; /* total bytes in the space */
671 u64 bytes_used; /* total bytes used on disk */
672 u64 bytes_pinned; /* total bytes pinned, will be freed when the
673 transaction finishes */
674 u64 bytes_reserved; /* total bytes the allocator has reserved for
675 current allocations */
676 u64 bytes_readonly; /* total bytes that are read only */
678 /* delalloc accounting */
679 u64 bytes_delalloc; /* number of bytes reserved for allocation,
680 this space is not necessarily reserved yet
682 u64 bytes_may_use; /* number of bytes that may be used for
685 int full; /* indicates that we cannot allocate any more
686 chunks for this space */
687 int force_alloc; /* set if we need to force a chunk alloc for
690 struct list_head list;
692 /* for block groups in our same type */
693 struct list_head block_groups;
695 struct rw_semaphore groups_sem;
696 atomic_t caching_threads;
700 * free clusters are used to claim free space in relatively large chunks,
701 * allowing us to do less seeky writes. They are used for all metadata
702 * allocations and data allocations in ssd mode.
704 struct btrfs_free_cluster {
706 spinlock_t refill_lock;
709 /* largest extent in this cluster */
712 /* first extent starting offset */
715 /* if this cluster simply points at a bitmap in the block group */
716 bool points_to_bitmap;
718 struct btrfs_block_group_cache *block_group;
720 * when a cluster is allocated from a block group, we put the
721 * cluster onto a list in the block group so that it can
722 * be freed before the block group is freed.
724 struct list_head block_group_list;
727 enum btrfs_caching_type {
729 BTRFS_CACHE_STARTED = 1,
730 BTRFS_CACHE_FINISHED = 2,
733 struct btrfs_caching_control {
734 struct list_head list;
736 wait_queue_head_t wait;
737 struct btrfs_block_group_cache *block_group;
742 struct btrfs_block_group_cache {
743 struct btrfs_key key;
744 struct btrfs_block_group_item item;
745 struct btrfs_fs_info *fs_info;
757 /* cache tracking stuff */
759 struct btrfs_caching_control *caching_ctl;
760 u64 last_byte_to_unpin;
762 struct btrfs_space_info *space_info;
764 /* free space cache stuff */
765 spinlock_t tree_lock;
766 struct rb_root free_space_offset;
769 /* block group cache stuff */
770 struct rb_node cache_node;
772 /* for block groups in the same raid type */
773 struct list_head list;
778 /* List of struct btrfs_free_clusters for this block group.
779 * Today it will only have one thing on it, but that may change
781 struct list_head cluster_list;
784 struct reloc_control;
786 struct btrfs_fs_devices;
787 struct btrfs_fs_info {
788 u8 fsid[BTRFS_FSID_SIZE];
789 u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
790 struct btrfs_root *extent_root;
791 struct btrfs_root *tree_root;
792 struct btrfs_root *chunk_root;
793 struct btrfs_root *dev_root;
794 struct btrfs_root *fs_root;
795 struct btrfs_root *csum_root;
797 /* the log root tree is a directory of all the other log roots */
798 struct btrfs_root *log_root_tree;
800 spinlock_t fs_roots_radix_lock;
801 struct radix_tree_root fs_roots_radix;
803 /* block group cache stuff */
804 spinlock_t block_group_cache_lock;
805 struct rb_root block_group_cache_tree;
807 struct extent_io_tree freed_extents[2];
808 struct extent_io_tree *pinned_extents;
810 /* logical->physical extent mapping */
811 struct btrfs_mapping_tree mapping_tree;
814 u64 last_trans_committed;
817 * this is updated to the current trans every time a full commit
818 * is required instead of the faster short fsync log commits
820 u64 last_trans_log_full_commit;
821 u64 open_ioctl_trans;
822 unsigned long mount_opt;
826 struct btrfs_transaction *running_transaction;
827 wait_queue_head_t transaction_throttle;
828 wait_queue_head_t transaction_wait;
829 wait_queue_head_t async_submit_wait;
831 struct btrfs_super_block super_copy;
832 struct btrfs_super_block super_for_commit;
833 struct block_device *__bdev;
834 struct super_block *sb;
835 struct inode *btree_inode;
836 struct backing_dev_info bdi;
837 struct mutex trans_mutex;
838 struct mutex tree_log_mutex;
839 struct mutex transaction_kthread_mutex;
840 struct mutex cleaner_mutex;
841 struct mutex chunk_mutex;
842 struct mutex drop_mutex;
843 struct mutex volume_mutex;
844 struct mutex tree_reloc_mutex;
846 * this protects the ordered operations list only while we are
847 * processing all of the entries on it. This way we make
848 * sure the commit code doesn't find the list temporarily empty
849 * because another function happens to be doing non-waiting preflush
850 * before jumping into the main commit.
852 struct mutex ordered_operations_mutex;
853 struct rw_semaphore extent_commit_sem;
855 struct list_head trans_list;
856 struct list_head hashers;
857 struct list_head dead_roots;
858 struct list_head caching_block_groups;
860 atomic_t nr_async_submits;
861 atomic_t async_submit_draining;
862 atomic_t nr_async_bios;
863 atomic_t async_delalloc_pages;
866 * this is used by the balancing code to wait for all the pending
869 spinlock_t ordered_extent_lock;
872 * all of the data=ordered extents pending writeback
873 * these can span multiple transactions and basically include
874 * every dirty data page that isn't from nodatacow
876 struct list_head ordered_extents;
879 * all of the inodes that have delalloc bytes. It is possible for
880 * this list to be empty even when there is still dirty data=ordered
881 * extents waiting to finish IO.
883 struct list_head delalloc_inodes;
886 * special rename and truncate targets that must be on disk before
887 * we're allowed to commit. This is basically the ext3 style
890 struct list_head ordered_operations;
893 * there is a pool of worker threads for checksumming during writes
894 * and a pool for checksumming after reads. This is because readers
895 * can run with FS locks held, and the writers may be waiting for
896 * those locks. We don't want ordering in the pending list to cause
897 * deadlocks, and so the two are serviced separately.
899 * A third pool does submit_bio to avoid deadlocking with the other
902 struct btrfs_workers workers;
903 struct btrfs_workers delalloc_workers;
904 struct btrfs_workers endio_workers;
905 struct btrfs_workers endio_meta_workers;
906 struct btrfs_workers endio_meta_write_workers;
907 struct btrfs_workers endio_write_workers;
908 struct btrfs_workers submit_workers;
910 * fixup workers take dirty pages that didn't properly go through
911 * the cow mechanism and make them safe to write. It happens
912 * for the sys_munmap function call path
914 struct btrfs_workers fixup_workers;
915 struct task_struct *transaction_kthread;
916 struct task_struct *cleaner_kthread;
917 int thread_pool_size;
919 struct kobject super_kobj;
920 struct completion kobj_unregister;
923 int log_root_recovering;
927 /* protected by the delalloc lock, used to keep from writing
928 * metadata until there is a nice batch
930 u64 dirty_metadata_bytes;
931 struct list_head dirty_cowonly_roots;
933 struct btrfs_fs_devices *fs_devices;
936 * the space_info list is almost entirely read only. It only changes
937 * when we add a new raid type to the FS, and that happens
938 * very rarely. RCU is used to protect it.
940 struct list_head space_info;
942 struct reloc_control *reloc_ctl;
944 spinlock_t delalloc_lock;
945 spinlock_t new_trans_lock;
948 /* data_alloc_cluster is only used in ssd mode */
949 struct btrfs_free_cluster data_alloc_cluster;
951 /* all metadata allocations go through this cluster */
952 struct btrfs_free_cluster meta_alloc_cluster;
954 spinlock_t ref_cache_lock;
955 u64 total_ref_cache_size;
957 u64 avail_data_alloc_bits;
958 u64 avail_metadata_alloc_bits;
959 u64 avail_system_alloc_bits;
960 u64 data_alloc_profile;
961 u64 metadata_alloc_profile;
962 u64 system_alloc_profile;
964 unsigned data_chunk_allocations;
965 unsigned metadata_ratio;
971 * in ram representation of the tree. extent_root is used for all allocations
972 * and for the extent tree extent_root root.
975 struct extent_buffer *node;
977 /* the node lock is held while changing the node pointer */
978 spinlock_t node_lock;
980 struct extent_buffer *commit_root;
981 struct btrfs_root *log_root;
982 struct btrfs_root *reloc_root;
984 struct btrfs_root_item root_item;
985 struct btrfs_key root_key;
986 struct btrfs_fs_info *fs_info;
987 struct extent_io_tree dirty_log_pages;
989 struct kobject root_kobj;
990 struct completion kobj_unregister;
991 struct mutex objectid_mutex;
993 struct mutex log_mutex;
994 wait_queue_head_t log_writer_wait;
995 wait_queue_head_t log_commit_wait[2];
996 atomic_t log_writers;
997 atomic_t log_commit[2];
998 unsigned long log_transid;
999 unsigned long log_batch;
1004 /* data allocations are done in sectorsize units */
1007 /* node allocations are done in nodesize units */
1010 /* leaf allocations are done in leafsize units */
1017 u64 highest_objectid;
1022 u64 defrag_trans_start;
1023 struct btrfs_key defrag_progress;
1024 struct btrfs_key defrag_max;
1030 /* the dirty list is only used by non-reference counted roots */
1031 struct list_head dirty_list;
1033 struct list_head root_list;
1035 spinlock_t list_lock;
1036 struct list_head orphan_list;
1038 spinlock_t inode_lock;
1039 /* red-black tree that keeps track of in-memory inodes */
1040 struct rb_root inode_tree;
1043 * right now this just gets used so that a root has its own devid
1044 * for stat. It may be used for more later
1046 struct super_block anon_super;
1050 * inode items have the data typically returned from stat and store other
1051 * info about object characteristics. There is one for every file and dir in
1054 #define BTRFS_INODE_ITEM_KEY 1
1055 #define BTRFS_INODE_REF_KEY 12
1056 #define BTRFS_XATTR_ITEM_KEY 24
1057 #define BTRFS_ORPHAN_ITEM_KEY 48
1058 /* reserve 2-15 close to the inode for later flexibility */
1061 * dir items are the name -> inode pointers in a directory. There is one
1062 * for every name in a directory.
1064 #define BTRFS_DIR_LOG_ITEM_KEY 60
1065 #define BTRFS_DIR_LOG_INDEX_KEY 72
1066 #define BTRFS_DIR_ITEM_KEY 84
1067 #define BTRFS_DIR_INDEX_KEY 96
1069 * extent data is for file data
1071 #define BTRFS_EXTENT_DATA_KEY 108
1074 * extent csums are stored in a separate tree and hold csums for
1075 * an entire extent on disk.
1077 #define BTRFS_EXTENT_CSUM_KEY 128
1080 * root items point to tree roots. They are typically in the root
1081 * tree used by the super block to find all the other trees
1083 #define BTRFS_ROOT_ITEM_KEY 132
1086 * root backrefs tie subvols and snapshots to the directory entries that
1089 #define BTRFS_ROOT_BACKREF_KEY 144
1092 * root refs make a fast index for listing all of the snapshots and
1093 * subvolumes referenced by a given root. They point directly to the
1094 * directory item in the root that references the subvol
1096 #define BTRFS_ROOT_REF_KEY 156
1099 * extent items are in the extent map tree. These record which blocks
1100 * are used, and how many references there are to each block
1102 #define BTRFS_EXTENT_ITEM_KEY 168
1104 #define BTRFS_TREE_BLOCK_REF_KEY 176
1106 #define BTRFS_EXTENT_DATA_REF_KEY 178
1108 #define BTRFS_EXTENT_REF_V0_KEY 180
1110 #define BTRFS_SHARED_BLOCK_REF_KEY 182
1112 #define BTRFS_SHARED_DATA_REF_KEY 184
1115 * block groups give us hints into the extent allocation trees. Which
1116 * blocks are free etc etc
1118 #define BTRFS_BLOCK_GROUP_ITEM_KEY 192
1120 #define BTRFS_DEV_EXTENT_KEY 204
1121 #define BTRFS_DEV_ITEM_KEY 216
1122 #define BTRFS_CHUNK_ITEM_KEY 228
1125 * string items are for debugging. They just store a short string of
1128 #define BTRFS_STRING_ITEM_KEY 253
1130 #define BTRFS_MOUNT_NODATASUM (1 << 0)
1131 #define BTRFS_MOUNT_NODATACOW (1 << 1)
1132 #define BTRFS_MOUNT_NOBARRIER (1 << 2)
1133 #define BTRFS_MOUNT_SSD (1 << 3)
1134 #define BTRFS_MOUNT_DEGRADED (1 << 4)
1135 #define BTRFS_MOUNT_COMPRESS (1 << 5)
1136 #define BTRFS_MOUNT_NOTREELOG (1 << 6)
1137 #define BTRFS_MOUNT_FLUSHONCOMMIT (1 << 7)
1138 #define BTRFS_MOUNT_SSD_SPREAD (1 << 8)
1139 #define BTRFS_MOUNT_NOSSD (1 << 9)
1141 #define btrfs_clear_opt(o, opt) ((o) &= ~BTRFS_MOUNT_##opt)
1142 #define btrfs_set_opt(o, opt) ((o) |= BTRFS_MOUNT_##opt)
1143 #define btrfs_test_opt(root, opt) ((root)->fs_info->mount_opt & \
1148 #define BTRFS_INODE_NODATASUM (1 << 0)
1149 #define BTRFS_INODE_NODATACOW (1 << 1)
1150 #define BTRFS_INODE_READONLY (1 << 2)
1151 #define BTRFS_INODE_NOCOMPRESS (1 << 3)
1152 #define BTRFS_INODE_PREALLOC (1 << 4)
1153 #define BTRFS_INODE_SYNC (1 << 5)
1154 #define BTRFS_INODE_IMMUTABLE (1 << 6)
1155 #define BTRFS_INODE_APPEND (1 << 7)
1156 #define BTRFS_INODE_NODUMP (1 << 8)
1157 #define BTRFS_INODE_NOATIME (1 << 9)
1158 #define BTRFS_INODE_DIRSYNC (1 << 10)
1161 /* some macros to generate set/get funcs for the struct fields. This
1162 * assumes there is a lefoo_to_cpu for every type, so lets make a simple
1165 #define le8_to_cpu(v) (v)
1166 #define cpu_to_le8(v) (v)
1169 #define read_eb_member(eb, ptr, type, member, result) ( \
1170 read_extent_buffer(eb, (char *)(result), \
1171 ((unsigned long)(ptr)) + \
1172 offsetof(type, member), \
1173 sizeof(((type *)0)->member)))
1175 #define write_eb_member(eb, ptr, type, member, result) ( \
1176 write_extent_buffer(eb, (char *)(result), \
1177 ((unsigned long)(ptr)) + \
1178 offsetof(type, member), \
1179 sizeof(((type *)0)->member)))
1181 #ifndef BTRFS_SETGET_FUNCS
1182 #define BTRFS_SETGET_FUNCS(name, type, member, bits) \
1183 u##bits btrfs_##name(struct extent_buffer *eb, type *s); \
1184 void btrfs_set_##name(struct extent_buffer *eb, type *s, u##bits val);
1187 #define BTRFS_SETGET_HEADER_FUNCS(name, type, member, bits) \
1188 static inline u##bits btrfs_##name(struct extent_buffer *eb) \
1190 type *p = kmap_atomic(eb->first_page, KM_USER0); \
1191 u##bits res = le##bits##_to_cpu(p->member); \
1192 kunmap_atomic(p, KM_USER0); \
1195 static inline void btrfs_set_##name(struct extent_buffer *eb, \
1198 type *p = kmap_atomic(eb->first_page, KM_USER0); \
1199 p->member = cpu_to_le##bits(val); \
1200 kunmap_atomic(p, KM_USER0); \
1203 #define BTRFS_SETGET_STACK_FUNCS(name, type, member, bits) \
1204 static inline u##bits btrfs_##name(type *s) \
1206 return le##bits##_to_cpu(s->member); \
1208 static inline void btrfs_set_##name(type *s, u##bits val) \
1210 s->member = cpu_to_le##bits(val); \
1213 BTRFS_SETGET_FUNCS(device_type, struct btrfs_dev_item, type, 64);
1214 BTRFS_SETGET_FUNCS(device_total_bytes, struct btrfs_dev_item, total_bytes, 64);
1215 BTRFS_SETGET_FUNCS(device_bytes_used, struct btrfs_dev_item, bytes_used, 64);
1216 BTRFS_SETGET_FUNCS(device_io_align, struct btrfs_dev_item, io_align, 32);
1217 BTRFS_SETGET_FUNCS(device_io_width, struct btrfs_dev_item, io_width, 32);
1218 BTRFS_SETGET_FUNCS(device_start_offset, struct btrfs_dev_item,
1220 BTRFS_SETGET_FUNCS(device_sector_size, struct btrfs_dev_item, sector_size, 32);
1221 BTRFS_SETGET_FUNCS(device_id, struct btrfs_dev_item, devid, 64);
1222 BTRFS_SETGET_FUNCS(device_group, struct btrfs_dev_item, dev_group, 32);
1223 BTRFS_SETGET_FUNCS(device_seek_speed, struct btrfs_dev_item, seek_speed, 8);
1224 BTRFS_SETGET_FUNCS(device_bandwidth, struct btrfs_dev_item, bandwidth, 8);
1225 BTRFS_SETGET_FUNCS(device_generation, struct btrfs_dev_item, generation, 64);
1227 BTRFS_SETGET_STACK_FUNCS(stack_device_type, struct btrfs_dev_item, type, 64);
1228 BTRFS_SETGET_STACK_FUNCS(stack_device_total_bytes, struct btrfs_dev_item,
1230 BTRFS_SETGET_STACK_FUNCS(stack_device_bytes_used, struct btrfs_dev_item,
1232 BTRFS_SETGET_STACK_FUNCS(stack_device_io_align, struct btrfs_dev_item,
1234 BTRFS_SETGET_STACK_FUNCS(stack_device_io_width, struct btrfs_dev_item,
1236 BTRFS_SETGET_STACK_FUNCS(stack_device_sector_size, struct btrfs_dev_item,
1238 BTRFS_SETGET_STACK_FUNCS(stack_device_id, struct btrfs_dev_item, devid, 64);
1239 BTRFS_SETGET_STACK_FUNCS(stack_device_group, struct btrfs_dev_item,
1241 BTRFS_SETGET_STACK_FUNCS(stack_device_seek_speed, struct btrfs_dev_item,
1243 BTRFS_SETGET_STACK_FUNCS(stack_device_bandwidth, struct btrfs_dev_item,
1245 BTRFS_SETGET_STACK_FUNCS(stack_device_generation, struct btrfs_dev_item,
1248 static inline char *btrfs_device_uuid(struct btrfs_dev_item *d)
1250 return (char *)d + offsetof(struct btrfs_dev_item, uuid);
1253 static inline char *btrfs_device_fsid(struct btrfs_dev_item *d)
1255 return (char *)d + offsetof(struct btrfs_dev_item, fsid);
1258 BTRFS_SETGET_FUNCS(chunk_length, struct btrfs_chunk, length, 64);
1259 BTRFS_SETGET_FUNCS(chunk_owner, struct btrfs_chunk, owner, 64);
1260 BTRFS_SETGET_FUNCS(chunk_stripe_len, struct btrfs_chunk, stripe_len, 64);
1261 BTRFS_SETGET_FUNCS(chunk_io_align, struct btrfs_chunk, io_align, 32);
1262 BTRFS_SETGET_FUNCS(chunk_io_width, struct btrfs_chunk, io_width, 32);
1263 BTRFS_SETGET_FUNCS(chunk_sector_size, struct btrfs_chunk, sector_size, 32);
1264 BTRFS_SETGET_FUNCS(chunk_type, struct btrfs_chunk, type, 64);
1265 BTRFS_SETGET_FUNCS(chunk_num_stripes, struct btrfs_chunk, num_stripes, 16);
1266 BTRFS_SETGET_FUNCS(chunk_sub_stripes, struct btrfs_chunk, sub_stripes, 16);
1267 BTRFS_SETGET_FUNCS(stripe_devid, struct btrfs_stripe, devid, 64);
1268 BTRFS_SETGET_FUNCS(stripe_offset, struct btrfs_stripe, offset, 64);
1270 static inline char *btrfs_stripe_dev_uuid(struct btrfs_stripe *s)
1272 return (char *)s + offsetof(struct btrfs_stripe, dev_uuid);
1275 BTRFS_SETGET_STACK_FUNCS(stack_chunk_length, struct btrfs_chunk, length, 64);
1276 BTRFS_SETGET_STACK_FUNCS(stack_chunk_owner, struct btrfs_chunk, owner, 64);
1277 BTRFS_SETGET_STACK_FUNCS(stack_chunk_stripe_len, struct btrfs_chunk,
1279 BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_align, struct btrfs_chunk,
1281 BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_width, struct btrfs_chunk,
1283 BTRFS_SETGET_STACK_FUNCS(stack_chunk_sector_size, struct btrfs_chunk,
1285 BTRFS_SETGET_STACK_FUNCS(stack_chunk_type, struct btrfs_chunk, type, 64);
1286 BTRFS_SETGET_STACK_FUNCS(stack_chunk_num_stripes, struct btrfs_chunk,
1288 BTRFS_SETGET_STACK_FUNCS(stack_chunk_sub_stripes, struct btrfs_chunk,
1290 BTRFS_SETGET_STACK_FUNCS(stack_stripe_devid, struct btrfs_stripe, devid, 64);
1291 BTRFS_SETGET_STACK_FUNCS(stack_stripe_offset, struct btrfs_stripe, offset, 64);
1293 static inline struct btrfs_stripe *btrfs_stripe_nr(struct btrfs_chunk *c,
1296 unsigned long offset = (unsigned long)c;
1297 offset += offsetof(struct btrfs_chunk, stripe);
1298 offset += nr * sizeof(struct btrfs_stripe);
1299 return (struct btrfs_stripe *)offset;
1302 static inline char *btrfs_stripe_dev_uuid_nr(struct btrfs_chunk *c, int nr)
1304 return btrfs_stripe_dev_uuid(btrfs_stripe_nr(c, nr));
1307 static inline u64 btrfs_stripe_offset_nr(struct extent_buffer *eb,
1308 struct btrfs_chunk *c, int nr)
1310 return btrfs_stripe_offset(eb, btrfs_stripe_nr(c, nr));
1313 static inline void btrfs_set_stripe_offset_nr(struct extent_buffer *eb,
1314 struct btrfs_chunk *c, int nr,
1317 btrfs_set_stripe_offset(eb, btrfs_stripe_nr(c, nr), val);
1320 static inline u64 btrfs_stripe_devid_nr(struct extent_buffer *eb,
1321 struct btrfs_chunk *c, int nr)
1323 return btrfs_stripe_devid(eb, btrfs_stripe_nr(c, nr));
1326 static inline void btrfs_set_stripe_devid_nr(struct extent_buffer *eb,
1327 struct btrfs_chunk *c, int nr,
1330 btrfs_set_stripe_devid(eb, btrfs_stripe_nr(c, nr), val);
1333 /* struct btrfs_block_group_item */
1334 BTRFS_SETGET_STACK_FUNCS(block_group_used, struct btrfs_block_group_item,
1336 BTRFS_SETGET_FUNCS(disk_block_group_used, struct btrfs_block_group_item,
1338 BTRFS_SETGET_STACK_FUNCS(block_group_chunk_objectid,
1339 struct btrfs_block_group_item, chunk_objectid, 64);
1341 BTRFS_SETGET_FUNCS(disk_block_group_chunk_objectid,
1342 struct btrfs_block_group_item, chunk_objectid, 64);
1343 BTRFS_SETGET_FUNCS(disk_block_group_flags,
1344 struct btrfs_block_group_item, flags, 64);
1345 BTRFS_SETGET_STACK_FUNCS(block_group_flags,
1346 struct btrfs_block_group_item, flags, 64);
1348 /* struct btrfs_inode_ref */
1349 BTRFS_SETGET_FUNCS(inode_ref_name_len, struct btrfs_inode_ref, name_len, 16);
1350 BTRFS_SETGET_FUNCS(inode_ref_index, struct btrfs_inode_ref, index, 64);
1352 /* struct btrfs_inode_item */
1353 BTRFS_SETGET_FUNCS(inode_generation, struct btrfs_inode_item, generation, 64);
1354 BTRFS_SETGET_FUNCS(inode_sequence, struct btrfs_inode_item, sequence, 64);
1355 BTRFS_SETGET_FUNCS(inode_transid, struct btrfs_inode_item, transid, 64);
1356 BTRFS_SETGET_FUNCS(inode_size, struct btrfs_inode_item, size, 64);
1357 BTRFS_SETGET_FUNCS(inode_nbytes, struct btrfs_inode_item, nbytes, 64);
1358 BTRFS_SETGET_FUNCS(inode_block_group, struct btrfs_inode_item, block_group, 64);
1359 BTRFS_SETGET_FUNCS(inode_nlink, struct btrfs_inode_item, nlink, 32);
1360 BTRFS_SETGET_FUNCS(inode_uid, struct btrfs_inode_item, uid, 32);
1361 BTRFS_SETGET_FUNCS(inode_gid, struct btrfs_inode_item, gid, 32);
1362 BTRFS_SETGET_FUNCS(inode_mode, struct btrfs_inode_item, mode, 32);
1363 BTRFS_SETGET_FUNCS(inode_rdev, struct btrfs_inode_item, rdev, 64);
1364 BTRFS_SETGET_FUNCS(inode_flags, struct btrfs_inode_item, flags, 64);
1366 static inline struct btrfs_timespec *
1367 btrfs_inode_atime(struct btrfs_inode_item *inode_item)
1369 unsigned long ptr = (unsigned long)inode_item;
1370 ptr += offsetof(struct btrfs_inode_item, atime);
1371 return (struct btrfs_timespec *)ptr;
1374 static inline struct btrfs_timespec *
1375 btrfs_inode_mtime(struct btrfs_inode_item *inode_item)
1377 unsigned long ptr = (unsigned long)inode_item;
1378 ptr += offsetof(struct btrfs_inode_item, mtime);
1379 return (struct btrfs_timespec *)ptr;
1382 static inline struct btrfs_timespec *
1383 btrfs_inode_ctime(struct btrfs_inode_item *inode_item)
1385 unsigned long ptr = (unsigned long)inode_item;
1386 ptr += offsetof(struct btrfs_inode_item, ctime);
1387 return (struct btrfs_timespec *)ptr;
1390 static inline struct btrfs_timespec *
1391 btrfs_inode_otime(struct btrfs_inode_item *inode_item)
1393 unsigned long ptr = (unsigned long)inode_item;
1394 ptr += offsetof(struct btrfs_inode_item, otime);
1395 return (struct btrfs_timespec *)ptr;
1398 BTRFS_SETGET_FUNCS(timespec_sec, struct btrfs_timespec, sec, 64);
1399 BTRFS_SETGET_FUNCS(timespec_nsec, struct btrfs_timespec, nsec, 32);
1401 /* struct btrfs_dev_extent */
1402 BTRFS_SETGET_FUNCS(dev_extent_chunk_tree, struct btrfs_dev_extent,
1404 BTRFS_SETGET_FUNCS(dev_extent_chunk_objectid, struct btrfs_dev_extent,
1405 chunk_objectid, 64);
1406 BTRFS_SETGET_FUNCS(dev_extent_chunk_offset, struct btrfs_dev_extent,
1408 BTRFS_SETGET_FUNCS(dev_extent_length, struct btrfs_dev_extent, length, 64);
1410 static inline u8 *btrfs_dev_extent_chunk_tree_uuid(struct btrfs_dev_extent *dev)
1412 unsigned long ptr = offsetof(struct btrfs_dev_extent, chunk_tree_uuid);
1413 return (u8 *)((unsigned long)dev + ptr);
1416 BTRFS_SETGET_FUNCS(extent_refs, struct btrfs_extent_item, refs, 64);
1417 BTRFS_SETGET_FUNCS(extent_generation, struct btrfs_extent_item,
1419 BTRFS_SETGET_FUNCS(extent_flags, struct btrfs_extent_item, flags, 64);
1421 BTRFS_SETGET_FUNCS(extent_refs_v0, struct btrfs_extent_item_v0, refs, 32);
1424 BTRFS_SETGET_FUNCS(tree_block_level, struct btrfs_tree_block_info, level, 8);
1426 static inline void btrfs_tree_block_key(struct extent_buffer *eb,
1427 struct btrfs_tree_block_info *item,
1428 struct btrfs_disk_key *key)
1430 read_eb_member(eb, item, struct btrfs_tree_block_info, key, key);
1433 static inline void btrfs_set_tree_block_key(struct extent_buffer *eb,
1434 struct btrfs_tree_block_info *item,
1435 struct btrfs_disk_key *key)
1437 write_eb_member(eb, item, struct btrfs_tree_block_info, key, key);
1440 BTRFS_SETGET_FUNCS(extent_data_ref_root, struct btrfs_extent_data_ref,
1442 BTRFS_SETGET_FUNCS(extent_data_ref_objectid, struct btrfs_extent_data_ref,
1444 BTRFS_SETGET_FUNCS(extent_data_ref_offset, struct btrfs_extent_data_ref,
1446 BTRFS_SETGET_FUNCS(extent_data_ref_count, struct btrfs_extent_data_ref,
1449 BTRFS_SETGET_FUNCS(shared_data_ref_count, struct btrfs_shared_data_ref,
1452 BTRFS_SETGET_FUNCS(extent_inline_ref_type, struct btrfs_extent_inline_ref,
1454 BTRFS_SETGET_FUNCS(extent_inline_ref_offset, struct btrfs_extent_inline_ref,
1457 static inline u32 btrfs_extent_inline_ref_size(int type)
1459 if (type == BTRFS_TREE_BLOCK_REF_KEY ||
1460 type == BTRFS_SHARED_BLOCK_REF_KEY)
1461 return sizeof(struct btrfs_extent_inline_ref);
1462 if (type == BTRFS_SHARED_DATA_REF_KEY)
1463 return sizeof(struct btrfs_shared_data_ref) +
1464 sizeof(struct btrfs_extent_inline_ref);
1465 if (type == BTRFS_EXTENT_DATA_REF_KEY)
1466 return sizeof(struct btrfs_extent_data_ref) +
1467 offsetof(struct btrfs_extent_inline_ref, offset);
1472 BTRFS_SETGET_FUNCS(ref_root_v0, struct btrfs_extent_ref_v0, root, 64);
1473 BTRFS_SETGET_FUNCS(ref_generation_v0, struct btrfs_extent_ref_v0,
1475 BTRFS_SETGET_FUNCS(ref_objectid_v0, struct btrfs_extent_ref_v0, objectid, 64);
1476 BTRFS_SETGET_FUNCS(ref_count_v0, struct btrfs_extent_ref_v0, count, 32);
1478 /* struct btrfs_node */
1479 BTRFS_SETGET_FUNCS(key_blockptr, struct btrfs_key_ptr, blockptr, 64);
1480 BTRFS_SETGET_FUNCS(key_generation, struct btrfs_key_ptr, generation, 64);
1482 static inline u64 btrfs_node_blockptr(struct extent_buffer *eb, int nr)
1485 ptr = offsetof(struct btrfs_node, ptrs) +
1486 sizeof(struct btrfs_key_ptr) * nr;
1487 return btrfs_key_blockptr(eb, (struct btrfs_key_ptr *)ptr);
1490 static inline void btrfs_set_node_blockptr(struct extent_buffer *eb,
1494 ptr = offsetof(struct btrfs_node, ptrs) +
1495 sizeof(struct btrfs_key_ptr) * nr;
1496 btrfs_set_key_blockptr(eb, (struct btrfs_key_ptr *)ptr, val);
1499 static inline u64 btrfs_node_ptr_generation(struct extent_buffer *eb, int nr)
1502 ptr = offsetof(struct btrfs_node, ptrs) +
1503 sizeof(struct btrfs_key_ptr) * nr;
1504 return btrfs_key_generation(eb, (struct btrfs_key_ptr *)ptr);
1507 static inline void btrfs_set_node_ptr_generation(struct extent_buffer *eb,
1511 ptr = offsetof(struct btrfs_node, ptrs) +
1512 sizeof(struct btrfs_key_ptr) * nr;
1513 btrfs_set_key_generation(eb, (struct btrfs_key_ptr *)ptr, val);
1516 static inline unsigned long btrfs_node_key_ptr_offset(int nr)
1518 return offsetof(struct btrfs_node, ptrs) +
1519 sizeof(struct btrfs_key_ptr) * nr;
1522 void btrfs_node_key(struct extent_buffer *eb,
1523 struct btrfs_disk_key *disk_key, int nr);
1525 static inline void btrfs_set_node_key(struct extent_buffer *eb,
1526 struct btrfs_disk_key *disk_key, int nr)
1529 ptr = btrfs_node_key_ptr_offset(nr);
1530 write_eb_member(eb, (struct btrfs_key_ptr *)ptr,
1531 struct btrfs_key_ptr, key, disk_key);
1534 /* struct btrfs_item */
1535 BTRFS_SETGET_FUNCS(item_offset, struct btrfs_item, offset, 32);
1536 BTRFS_SETGET_FUNCS(item_size, struct btrfs_item, size, 32);
1538 static inline unsigned long btrfs_item_nr_offset(int nr)
1540 return offsetof(struct btrfs_leaf, items) +
1541 sizeof(struct btrfs_item) * nr;
1544 static inline struct btrfs_item *btrfs_item_nr(struct extent_buffer *eb,
1547 return (struct btrfs_item *)btrfs_item_nr_offset(nr);
1550 static inline u32 btrfs_item_end(struct extent_buffer *eb,
1551 struct btrfs_item *item)
1553 return btrfs_item_offset(eb, item) + btrfs_item_size(eb, item);
1556 static inline u32 btrfs_item_end_nr(struct extent_buffer *eb, int nr)
1558 return btrfs_item_end(eb, btrfs_item_nr(eb, nr));
1561 static inline u32 btrfs_item_offset_nr(struct extent_buffer *eb, int nr)
1563 return btrfs_item_offset(eb, btrfs_item_nr(eb, nr));
1566 static inline u32 btrfs_item_size_nr(struct extent_buffer *eb, int nr)
1568 return btrfs_item_size(eb, btrfs_item_nr(eb, nr));
1571 static inline void btrfs_item_key(struct extent_buffer *eb,
1572 struct btrfs_disk_key *disk_key, int nr)
1574 struct btrfs_item *item = btrfs_item_nr(eb, nr);
1575 read_eb_member(eb, item, struct btrfs_item, key, disk_key);
1578 static inline void btrfs_set_item_key(struct extent_buffer *eb,
1579 struct btrfs_disk_key *disk_key, int nr)
1581 struct btrfs_item *item = btrfs_item_nr(eb, nr);
1582 write_eb_member(eb, item, struct btrfs_item, key, disk_key);
1585 BTRFS_SETGET_FUNCS(dir_log_end, struct btrfs_dir_log_item, end, 64);
1588 * struct btrfs_root_ref
1590 BTRFS_SETGET_FUNCS(root_ref_dirid, struct btrfs_root_ref, dirid, 64);
1591 BTRFS_SETGET_FUNCS(root_ref_sequence, struct btrfs_root_ref, sequence, 64);
1592 BTRFS_SETGET_FUNCS(root_ref_name_len, struct btrfs_root_ref, name_len, 16);
1594 /* struct btrfs_dir_item */
1595 BTRFS_SETGET_FUNCS(dir_data_len, struct btrfs_dir_item, data_len, 16);
1596 BTRFS_SETGET_FUNCS(dir_type, struct btrfs_dir_item, type, 8);
1597 BTRFS_SETGET_FUNCS(dir_name_len, struct btrfs_dir_item, name_len, 16);
1598 BTRFS_SETGET_FUNCS(dir_transid, struct btrfs_dir_item, transid, 64);
1600 static inline void btrfs_dir_item_key(struct extent_buffer *eb,
1601 struct btrfs_dir_item *item,
1602 struct btrfs_disk_key *key)
1604 read_eb_member(eb, item, struct btrfs_dir_item, location, key);
1607 static inline void btrfs_set_dir_item_key(struct extent_buffer *eb,
1608 struct btrfs_dir_item *item,
1609 struct btrfs_disk_key *key)
1611 write_eb_member(eb, item, struct btrfs_dir_item, location, key);
1614 /* struct btrfs_disk_key */
1615 BTRFS_SETGET_STACK_FUNCS(disk_key_objectid, struct btrfs_disk_key,
1617 BTRFS_SETGET_STACK_FUNCS(disk_key_offset, struct btrfs_disk_key, offset, 64);
1618 BTRFS_SETGET_STACK_FUNCS(disk_key_type, struct btrfs_disk_key, type, 8);
1620 static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu,
1621 struct btrfs_disk_key *disk)
1623 cpu->offset = le64_to_cpu(disk->offset);
1624 cpu->type = disk->type;
1625 cpu->objectid = le64_to_cpu(disk->objectid);
1628 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk,
1629 struct btrfs_key *cpu)
1631 disk->offset = cpu_to_le64(cpu->offset);
1632 disk->type = cpu->type;
1633 disk->objectid = cpu_to_le64(cpu->objectid);
1636 static inline void btrfs_node_key_to_cpu(struct extent_buffer *eb,
1637 struct btrfs_key *key, int nr)
1639 struct btrfs_disk_key disk_key;
1640 btrfs_node_key(eb, &disk_key, nr);
1641 btrfs_disk_key_to_cpu(key, &disk_key);
1644 static inline void btrfs_item_key_to_cpu(struct extent_buffer *eb,
1645 struct btrfs_key *key, int nr)
1647 struct btrfs_disk_key disk_key;
1648 btrfs_item_key(eb, &disk_key, nr);
1649 btrfs_disk_key_to_cpu(key, &disk_key);
1652 static inline void btrfs_dir_item_key_to_cpu(struct extent_buffer *eb,
1653 struct btrfs_dir_item *item,
1654 struct btrfs_key *key)
1656 struct btrfs_disk_key disk_key;
1657 btrfs_dir_item_key(eb, item, &disk_key);
1658 btrfs_disk_key_to_cpu(key, &disk_key);
1662 static inline u8 btrfs_key_type(struct btrfs_key *key)
1667 static inline void btrfs_set_key_type(struct btrfs_key *key, u8 val)
1672 /* struct btrfs_header */
1673 BTRFS_SETGET_HEADER_FUNCS(header_bytenr, struct btrfs_header, bytenr, 64);
1674 BTRFS_SETGET_HEADER_FUNCS(header_generation, struct btrfs_header,
1676 BTRFS_SETGET_HEADER_FUNCS(header_owner, struct btrfs_header, owner, 64);
1677 BTRFS_SETGET_HEADER_FUNCS(header_nritems, struct btrfs_header, nritems, 32);
1678 BTRFS_SETGET_HEADER_FUNCS(header_flags, struct btrfs_header, flags, 64);
1679 BTRFS_SETGET_HEADER_FUNCS(header_level, struct btrfs_header, level, 8);
1681 static inline int btrfs_header_flag(struct extent_buffer *eb, u64 flag)
1683 return (btrfs_header_flags(eb) & flag) == flag;
1686 static inline int btrfs_set_header_flag(struct extent_buffer *eb, u64 flag)
1688 u64 flags = btrfs_header_flags(eb);
1689 btrfs_set_header_flags(eb, flags | flag);
1690 return (flags & flag) == flag;
1693 static inline int btrfs_clear_header_flag(struct extent_buffer *eb, u64 flag)
1695 u64 flags = btrfs_header_flags(eb);
1696 btrfs_set_header_flags(eb, flags & ~flag);
1697 return (flags & flag) == flag;
1700 static inline int btrfs_header_backref_rev(struct extent_buffer *eb)
1702 u64 flags = btrfs_header_flags(eb);
1703 return flags >> BTRFS_BACKREF_REV_SHIFT;
1706 static inline void btrfs_set_header_backref_rev(struct extent_buffer *eb,
1709 u64 flags = btrfs_header_flags(eb);
1710 flags &= ~BTRFS_BACKREF_REV_MASK;
1711 flags |= (u64)rev << BTRFS_BACKREF_REV_SHIFT;
1712 btrfs_set_header_flags(eb, flags);
1715 static inline u8 *btrfs_header_fsid(struct extent_buffer *eb)
1717 unsigned long ptr = offsetof(struct btrfs_header, fsid);
1721 static inline u8 *btrfs_header_chunk_tree_uuid(struct extent_buffer *eb)
1723 unsigned long ptr = offsetof(struct btrfs_header, chunk_tree_uuid);
1727 static inline u8 *btrfs_super_fsid(struct extent_buffer *eb)
1729 unsigned long ptr = offsetof(struct btrfs_super_block, fsid);
1733 static inline u8 *btrfs_header_csum(struct extent_buffer *eb)
1735 unsigned long ptr = offsetof(struct btrfs_header, csum);
1739 static inline struct btrfs_node *btrfs_buffer_node(struct extent_buffer *eb)
1744 static inline struct btrfs_leaf *btrfs_buffer_leaf(struct extent_buffer *eb)
1749 static inline struct btrfs_header *btrfs_buffer_header(struct extent_buffer *eb)
1754 static inline int btrfs_is_leaf(struct extent_buffer *eb)
1756 return btrfs_header_level(eb) == 0;
1759 /* struct btrfs_root_item */
1760 BTRFS_SETGET_FUNCS(disk_root_generation, struct btrfs_root_item,
1762 BTRFS_SETGET_FUNCS(disk_root_refs, struct btrfs_root_item, refs, 32);
1763 BTRFS_SETGET_FUNCS(disk_root_bytenr, struct btrfs_root_item, bytenr, 64);
1764 BTRFS_SETGET_FUNCS(disk_root_level, struct btrfs_root_item, level, 8);
1766 BTRFS_SETGET_STACK_FUNCS(root_generation, struct btrfs_root_item,
1768 BTRFS_SETGET_STACK_FUNCS(root_bytenr, struct btrfs_root_item, bytenr, 64);
1769 BTRFS_SETGET_STACK_FUNCS(root_level, struct btrfs_root_item, level, 8);
1770 BTRFS_SETGET_STACK_FUNCS(root_dirid, struct btrfs_root_item, root_dirid, 64);
1771 BTRFS_SETGET_STACK_FUNCS(root_refs, struct btrfs_root_item, refs, 32);
1772 BTRFS_SETGET_STACK_FUNCS(root_flags, struct btrfs_root_item, flags, 64);
1773 BTRFS_SETGET_STACK_FUNCS(root_used, struct btrfs_root_item, bytes_used, 64);
1774 BTRFS_SETGET_STACK_FUNCS(root_limit, struct btrfs_root_item, byte_limit, 64);
1775 BTRFS_SETGET_STACK_FUNCS(root_last_snapshot, struct btrfs_root_item,
1778 /* struct btrfs_super_block */
1780 BTRFS_SETGET_STACK_FUNCS(super_bytenr, struct btrfs_super_block, bytenr, 64);
1781 BTRFS_SETGET_STACK_FUNCS(super_flags, struct btrfs_super_block, flags, 64);
1782 BTRFS_SETGET_STACK_FUNCS(super_generation, struct btrfs_super_block,
1784 BTRFS_SETGET_STACK_FUNCS(super_root, struct btrfs_super_block, root, 64);
1785 BTRFS_SETGET_STACK_FUNCS(super_sys_array_size,
1786 struct btrfs_super_block, sys_chunk_array_size, 32);
1787 BTRFS_SETGET_STACK_FUNCS(super_chunk_root_generation,
1788 struct btrfs_super_block, chunk_root_generation, 64);
1789 BTRFS_SETGET_STACK_FUNCS(super_root_level, struct btrfs_super_block,
1791 BTRFS_SETGET_STACK_FUNCS(super_chunk_root, struct btrfs_super_block,
1793 BTRFS_SETGET_STACK_FUNCS(super_chunk_root_level, struct btrfs_super_block,
1794 chunk_root_level, 8);
1795 BTRFS_SETGET_STACK_FUNCS(super_log_root, struct btrfs_super_block,
1797 BTRFS_SETGET_STACK_FUNCS(super_log_root_transid, struct btrfs_super_block,
1798 log_root_transid, 64);
1799 BTRFS_SETGET_STACK_FUNCS(super_log_root_level, struct btrfs_super_block,
1801 BTRFS_SETGET_STACK_FUNCS(super_total_bytes, struct btrfs_super_block,
1803 BTRFS_SETGET_STACK_FUNCS(super_bytes_used, struct btrfs_super_block,
1805 BTRFS_SETGET_STACK_FUNCS(super_sectorsize, struct btrfs_super_block,
1807 BTRFS_SETGET_STACK_FUNCS(super_nodesize, struct btrfs_super_block,
1809 BTRFS_SETGET_STACK_FUNCS(super_leafsize, struct btrfs_super_block,
1811 BTRFS_SETGET_STACK_FUNCS(super_stripesize, struct btrfs_super_block,
1813 BTRFS_SETGET_STACK_FUNCS(super_root_dir, struct btrfs_super_block,
1814 root_dir_objectid, 64);
1815 BTRFS_SETGET_STACK_FUNCS(super_num_devices, struct btrfs_super_block,
1817 BTRFS_SETGET_STACK_FUNCS(super_compat_flags, struct btrfs_super_block,
1819 BTRFS_SETGET_STACK_FUNCS(super_compat_ro_flags, struct btrfs_super_block,
1821 BTRFS_SETGET_STACK_FUNCS(super_incompat_flags, struct btrfs_super_block,
1822 incompat_flags, 64);
1823 BTRFS_SETGET_STACK_FUNCS(super_csum_type, struct btrfs_super_block,
1826 static inline int btrfs_super_csum_size(struct btrfs_super_block *s)
1828 int t = btrfs_super_csum_type(s);
1829 BUG_ON(t >= ARRAY_SIZE(btrfs_csum_sizes));
1830 return btrfs_csum_sizes[t];
1833 static inline unsigned long btrfs_leaf_data(struct extent_buffer *l)
1835 return offsetof(struct btrfs_leaf, items);
1838 /* struct btrfs_file_extent_item */
1839 BTRFS_SETGET_FUNCS(file_extent_type, struct btrfs_file_extent_item, type, 8);
1841 static inline unsigned long
1842 btrfs_file_extent_inline_start(struct btrfs_file_extent_item *e)
1844 unsigned long offset = (unsigned long)e;
1845 offset += offsetof(struct btrfs_file_extent_item, disk_bytenr);
1849 static inline u32 btrfs_file_extent_calc_inline_size(u32 datasize)
1851 return offsetof(struct btrfs_file_extent_item, disk_bytenr) + datasize;
1854 BTRFS_SETGET_FUNCS(file_extent_disk_bytenr, struct btrfs_file_extent_item,
1856 BTRFS_SETGET_FUNCS(file_extent_generation, struct btrfs_file_extent_item,
1858 BTRFS_SETGET_FUNCS(file_extent_disk_num_bytes, struct btrfs_file_extent_item,
1859 disk_num_bytes, 64);
1860 BTRFS_SETGET_FUNCS(file_extent_offset, struct btrfs_file_extent_item,
1862 BTRFS_SETGET_FUNCS(file_extent_num_bytes, struct btrfs_file_extent_item,
1864 BTRFS_SETGET_FUNCS(file_extent_ram_bytes, struct btrfs_file_extent_item,
1866 BTRFS_SETGET_FUNCS(file_extent_compression, struct btrfs_file_extent_item,
1868 BTRFS_SETGET_FUNCS(file_extent_encryption, struct btrfs_file_extent_item,
1870 BTRFS_SETGET_FUNCS(file_extent_other_encoding, struct btrfs_file_extent_item,
1871 other_encoding, 16);
1873 /* this returns the number of file bytes represented by the inline item.
1874 * If an item is compressed, this is the uncompressed size
1876 static inline u32 btrfs_file_extent_inline_len(struct extent_buffer *eb,
1877 struct btrfs_file_extent_item *e)
1879 return btrfs_file_extent_ram_bytes(eb, e);
1883 * this returns the number of bytes used by the item on disk, minus the
1884 * size of any extent headers. If a file is compressed on disk, this is
1885 * the compressed size
1887 static inline u32 btrfs_file_extent_inline_item_len(struct extent_buffer *eb,
1888 struct btrfs_item *e)
1890 unsigned long offset;
1891 offset = offsetof(struct btrfs_file_extent_item, disk_bytenr);
1892 return btrfs_item_size(eb, e) - offset;
1895 static inline struct btrfs_root *btrfs_sb(struct super_block *sb)
1897 return sb->s_fs_info;
1900 static inline int btrfs_set_root_name(struct btrfs_root *root,
1901 const char *name, int len)
1903 /* if we already have a name just free it */
1906 root->name = kmalloc(len+1, GFP_KERNEL);
1910 memcpy(root->name, name, len);
1911 root->name[len] = '\0';
1916 static inline u32 btrfs_level_size(struct btrfs_root *root, int level)
1919 return root->leafsize;
1920 return root->nodesize;
1923 /* helper function to cast into the data area of the leaf. */
1924 #define btrfs_item_ptr(leaf, slot, type) \
1925 ((type *)(btrfs_leaf_data(leaf) + \
1926 btrfs_item_offset_nr(leaf, slot)))
1928 #define btrfs_item_ptr_offset(leaf, slot) \
1929 ((unsigned long)(btrfs_leaf_data(leaf) + \
1930 btrfs_item_offset_nr(leaf, slot)))
1932 static inline struct dentry *fdentry(struct file *file)
1934 return file->f_path.dentry;
1938 void btrfs_put_block_group(struct btrfs_block_group_cache *cache);
1939 int btrfs_run_delayed_refs(struct btrfs_trans_handle *trans,
1940 struct btrfs_root *root, unsigned long count);
1941 int btrfs_lookup_extent(struct btrfs_root *root, u64 start, u64 len);
1942 int btrfs_pin_extent(struct btrfs_root *root,
1943 u64 bytenr, u64 num, int reserved);
1944 int btrfs_drop_leaf_ref(struct btrfs_trans_handle *trans,
1945 struct btrfs_root *root, struct extent_buffer *leaf);
1946 int btrfs_cross_ref_exist(struct btrfs_trans_handle *trans,
1947 struct btrfs_root *root,
1948 u64 objectid, u64 offset, u64 bytenr);
1949 int btrfs_copy_pinned(struct btrfs_root *root, struct extent_io_tree *copy);
1950 struct btrfs_block_group_cache *btrfs_lookup_block_group(
1951 struct btrfs_fs_info *info,
1953 void btrfs_put_block_group(struct btrfs_block_group_cache *cache);
1954 u64 btrfs_find_block_group(struct btrfs_root *root,
1955 u64 search_start, u64 search_hint, int owner);
1956 struct extent_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
1957 struct btrfs_root *root, u32 blocksize,
1958 u64 parent, u64 root_objectid,
1959 struct btrfs_disk_key *key, int level,
1960 u64 hint, u64 empty_size);
1961 struct extent_buffer *btrfs_init_new_buffer(struct btrfs_trans_handle *trans,
1962 struct btrfs_root *root,
1963 u64 bytenr, u32 blocksize,
1965 int btrfs_alloc_reserved_file_extent(struct btrfs_trans_handle *trans,
1966 struct btrfs_root *root,
1967 u64 root_objectid, u64 owner,
1968 u64 offset, struct btrfs_key *ins);
1969 int btrfs_alloc_logged_file_extent(struct btrfs_trans_handle *trans,
1970 struct btrfs_root *root,
1971 u64 root_objectid, u64 owner, u64 offset,
1972 struct btrfs_key *ins);
1973 int btrfs_reserve_extent(struct btrfs_trans_handle *trans,
1974 struct btrfs_root *root,
1975 u64 num_bytes, u64 min_alloc_size,
1976 u64 empty_size, u64 hint_byte,
1977 u64 search_end, struct btrfs_key *ins,
1979 int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1980 struct extent_buffer *buf, int full_backref);
1981 int btrfs_dec_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1982 struct extent_buffer *buf, int full_backref);
1983 int btrfs_set_disk_extent_flags(struct btrfs_trans_handle *trans,
1984 struct btrfs_root *root,
1985 u64 bytenr, u64 num_bytes, u64 flags,
1987 int btrfs_free_extent(struct btrfs_trans_handle *trans,
1988 struct btrfs_root *root,
1989 u64 bytenr, u64 num_bytes, u64 parent,
1990 u64 root_objectid, u64 owner, u64 offset);
1992 int btrfs_free_reserved_extent(struct btrfs_root *root, u64 start, u64 len);
1993 int btrfs_prepare_extent_commit(struct btrfs_trans_handle *trans,
1994 struct btrfs_root *root);
1995 int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans,
1996 struct btrfs_root *root);
1997 int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
1998 struct btrfs_root *root,
1999 u64 bytenr, u64 num_bytes, u64 parent,
2000 u64 root_objectid, u64 owner, u64 offset);
2002 int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans,
2003 struct btrfs_root *root);
2004 int btrfs_extent_readonly(struct btrfs_root *root, u64 bytenr);
2005 int btrfs_free_block_groups(struct btrfs_fs_info *info);
2006 int btrfs_read_block_groups(struct btrfs_root *root);
2007 int btrfs_make_block_group(struct btrfs_trans_handle *trans,
2008 struct btrfs_root *root, u64 bytes_used,
2009 u64 type, u64 chunk_objectid, u64 chunk_offset,
2011 int btrfs_remove_block_group(struct btrfs_trans_handle *trans,
2012 struct btrfs_root *root, u64 group_start);
2013 int btrfs_prepare_block_group_relocation(struct btrfs_root *root,
2014 struct btrfs_block_group_cache *group);
2016 u64 btrfs_reduce_alloc_profile(struct btrfs_root *root, u64 flags);
2017 void btrfs_set_inode_space_info(struct btrfs_root *root, struct inode *ionde);
2018 void btrfs_clear_space_info_full(struct btrfs_fs_info *info);
2020 int btrfs_check_metadata_free_space(struct btrfs_root *root);
2021 int btrfs_check_data_free_space(struct btrfs_root *root, struct inode *inode,
2023 void btrfs_free_reserved_data_space(struct btrfs_root *root,
2024 struct inode *inode, u64 bytes);
2025 void btrfs_delalloc_reserve_space(struct btrfs_root *root, struct inode *inode,
2027 void btrfs_delalloc_free_space(struct btrfs_root *root, struct inode *inode,
2030 int btrfs_bin_search(struct extent_buffer *eb, struct btrfs_key *key,
2031 int level, int *slot);
2032 int btrfs_comp_cpu_keys(struct btrfs_key *k1, struct btrfs_key *k2);
2033 int btrfs_previous_item(struct btrfs_root *root,
2034 struct btrfs_path *path, u64 min_objectid,
2036 int btrfs_set_item_key_safe(struct btrfs_trans_handle *trans,
2037 struct btrfs_root *root, struct btrfs_path *path,
2038 struct btrfs_key *new_key);
2039 struct extent_buffer *btrfs_root_node(struct btrfs_root *root);
2040 struct extent_buffer *btrfs_lock_root_node(struct btrfs_root *root);
2041 int btrfs_find_next_key(struct btrfs_root *root, struct btrfs_path *path,
2042 struct btrfs_key *key, int lowest_level,
2043 int cache_only, u64 min_trans);
2044 int btrfs_search_forward(struct btrfs_root *root, struct btrfs_key *min_key,
2045 struct btrfs_key *max_key,
2046 struct btrfs_path *path, int cache_only,
2048 int btrfs_cow_block(struct btrfs_trans_handle *trans,
2049 struct btrfs_root *root, struct extent_buffer *buf,
2050 struct extent_buffer *parent, int parent_slot,
2051 struct extent_buffer **cow_ret);
2052 int btrfs_copy_root(struct btrfs_trans_handle *trans,
2053 struct btrfs_root *root,
2054 struct extent_buffer *buf,
2055 struct extent_buffer **cow_ret, u64 new_root_objectid);
2056 int btrfs_block_can_be_shared(struct btrfs_root *root,
2057 struct extent_buffer *buf);
2058 int btrfs_extend_item(struct btrfs_trans_handle *trans, struct btrfs_root
2059 *root, struct btrfs_path *path, u32 data_size);
2060 int btrfs_truncate_item(struct btrfs_trans_handle *trans,
2061 struct btrfs_root *root,
2062 struct btrfs_path *path,
2063 u32 new_size, int from_end);
2064 int btrfs_split_item(struct btrfs_trans_handle *trans,
2065 struct btrfs_root *root,
2066 struct btrfs_path *path,
2067 struct btrfs_key *new_key,
2068 unsigned long split_offset);
2069 int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root
2070 *root, struct btrfs_key *key, struct btrfs_path *p, int
2072 int btrfs_realloc_node(struct btrfs_trans_handle *trans,
2073 struct btrfs_root *root, struct extent_buffer *parent,
2074 int start_slot, int cache_only, u64 *last_ret,
2075 struct btrfs_key *progress);
2076 void btrfs_release_path(struct btrfs_root *root, struct btrfs_path *p);
2077 struct btrfs_path *btrfs_alloc_path(void);
2078 void btrfs_free_path(struct btrfs_path *p);
2079 void btrfs_set_path_blocking(struct btrfs_path *p);
2080 void btrfs_unlock_up_safe(struct btrfs_path *p, int level);
2082 int btrfs_del_items(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2083 struct btrfs_path *path, int slot, int nr);
2084 static inline int btrfs_del_item(struct btrfs_trans_handle *trans,
2085 struct btrfs_root *root,
2086 struct btrfs_path *path)
2088 return btrfs_del_items(trans, root, path, path->slots[0], 1);
2091 int btrfs_insert_item(struct btrfs_trans_handle *trans, struct btrfs_root
2092 *root, struct btrfs_key *key, void *data, u32 data_size);
2093 int btrfs_insert_some_items(struct btrfs_trans_handle *trans,
2094 struct btrfs_root *root,
2095 struct btrfs_path *path,
2096 struct btrfs_key *cpu_key, u32 *data_size,
2098 int btrfs_insert_empty_items(struct btrfs_trans_handle *trans,
2099 struct btrfs_root *root,
2100 struct btrfs_path *path,
2101 struct btrfs_key *cpu_key, u32 *data_size, int nr);
2103 static inline int btrfs_insert_empty_item(struct btrfs_trans_handle *trans,
2104 struct btrfs_root *root,
2105 struct btrfs_path *path,
2106 struct btrfs_key *key,
2109 return btrfs_insert_empty_items(trans, root, path, key, &data_size, 1);
2112 int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path);
2113 int btrfs_prev_leaf(struct btrfs_root *root, struct btrfs_path *path);
2114 int btrfs_leaf_free_space(struct btrfs_root *root, struct extent_buffer *leaf);
2115 int btrfs_drop_snapshot(struct btrfs_root *root, int update_ref);
2116 int btrfs_drop_subtree(struct btrfs_trans_handle *trans,
2117 struct btrfs_root *root,
2118 struct extent_buffer *node,
2119 struct extent_buffer *parent);
2121 int btrfs_find_root_ref(struct btrfs_root *tree_root,
2122 struct btrfs_path *path,
2123 u64 root_id, u64 ref_id);
2124 int btrfs_add_root_ref(struct btrfs_trans_handle *trans,
2125 struct btrfs_root *tree_root,
2126 u64 root_id, u64 ref_id, u64 dirid, u64 sequence,
2127 const char *name, int name_len);
2128 int btrfs_del_root_ref(struct btrfs_trans_handle *trans,
2129 struct btrfs_root *tree_root,
2130 u64 root_id, u64 ref_id, u64 dirid, u64 *sequence,
2131 const char *name, int name_len);
2132 int btrfs_del_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2133 struct btrfs_key *key);
2134 int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root
2135 *root, struct btrfs_key *key, struct btrfs_root_item
2137 int btrfs_update_root(struct btrfs_trans_handle *trans, struct btrfs_root
2138 *root, struct btrfs_key *key, struct btrfs_root_item
2140 int btrfs_find_last_root(struct btrfs_root *root, u64 objectid, struct
2141 btrfs_root_item *item, struct btrfs_key *key);
2142 int btrfs_search_root(struct btrfs_root *root, u64 search_start,
2143 u64 *found_objectid);
2144 int btrfs_find_dead_roots(struct btrfs_root *root, u64 objectid);
2145 int btrfs_set_root_node(struct btrfs_root_item *item,
2146 struct extent_buffer *node);
2148 int btrfs_insert_dir_item(struct btrfs_trans_handle *trans,
2149 struct btrfs_root *root, const char *name,
2150 int name_len, u64 dir,
2151 struct btrfs_key *location, u8 type, u64 index);
2152 struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans,
2153 struct btrfs_root *root,
2154 struct btrfs_path *path, u64 dir,
2155 const char *name, int name_len,
2157 struct btrfs_dir_item *
2158 btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans,
2159 struct btrfs_root *root,
2160 struct btrfs_path *path, u64 dir,
2161 u64 objectid, const char *name, int name_len,
2163 struct btrfs_dir_item *
2164 btrfs_search_dir_index_item(struct btrfs_root *root,
2165 struct btrfs_path *path, u64 dirid,
2166 const char *name, int name_len);
2167 struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_root *root,
2168 struct btrfs_path *path,
2169 const char *name, int name_len);
2170 int btrfs_delete_one_dir_name(struct btrfs_trans_handle *trans,
2171 struct btrfs_root *root,
2172 struct btrfs_path *path,
2173 struct btrfs_dir_item *di);
2174 int btrfs_insert_xattr_item(struct btrfs_trans_handle *trans,
2175 struct btrfs_root *root, const char *name,
2176 u16 name_len, const void *data, u16 data_len,
2178 struct btrfs_dir_item *btrfs_lookup_xattr(struct btrfs_trans_handle *trans,
2179 struct btrfs_root *root,
2180 struct btrfs_path *path, u64 dir,
2181 const char *name, u16 name_len,
2185 int btrfs_insert_orphan_item(struct btrfs_trans_handle *trans,
2186 struct btrfs_root *root, u64 offset);
2187 int btrfs_del_orphan_item(struct btrfs_trans_handle *trans,
2188 struct btrfs_root *root, u64 offset);
2189 int btrfs_find_orphan_item(struct btrfs_root *root, u64 offset);
2192 int btrfs_find_free_objectid(struct btrfs_trans_handle *trans,
2193 struct btrfs_root *fs_root,
2194 u64 dirid, u64 *objectid);
2195 int btrfs_find_highest_inode(struct btrfs_root *fs_root, u64 *objectid);
2198 int btrfs_insert_inode_ref(struct btrfs_trans_handle *trans,
2199 struct btrfs_root *root,
2200 const char *name, int name_len,
2201 u64 inode_objectid, u64 ref_objectid, u64 index);
2202 int btrfs_del_inode_ref(struct btrfs_trans_handle *trans,
2203 struct btrfs_root *root,
2204 const char *name, int name_len,
2205 u64 inode_objectid, u64 ref_objectid, u64 *index);
2206 int btrfs_insert_empty_inode(struct btrfs_trans_handle *trans,
2207 struct btrfs_root *root,
2208 struct btrfs_path *path, u64 objectid);
2209 int btrfs_lookup_inode(struct btrfs_trans_handle *trans, struct btrfs_root
2210 *root, struct btrfs_path *path,
2211 struct btrfs_key *location, int mod);
2214 int btrfs_del_csums(struct btrfs_trans_handle *trans,
2215 struct btrfs_root *root, u64 bytenr, u64 len);
2216 int btrfs_lookup_bio_sums(struct btrfs_root *root, struct inode *inode,
2217 struct bio *bio, u32 *dst);
2218 int btrfs_insert_file_extent(struct btrfs_trans_handle *trans,
2219 struct btrfs_root *root,
2220 u64 objectid, u64 pos,
2221 u64 disk_offset, u64 disk_num_bytes,
2222 u64 num_bytes, u64 offset, u64 ram_bytes,
2223 u8 compression, u8 encryption, u16 other_encoding);
2224 int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
2225 struct btrfs_root *root,
2226 struct btrfs_path *path, u64 objectid,
2227 u64 bytenr, int mod);
2228 int btrfs_csum_file_blocks(struct btrfs_trans_handle *trans,
2229 struct btrfs_root *root,
2230 struct btrfs_ordered_sum *sums);
2231 int btrfs_csum_one_bio(struct btrfs_root *root, struct inode *inode,
2232 struct bio *bio, u64 file_start, int contig);
2233 int btrfs_csum_file_bytes(struct btrfs_root *root, struct inode *inode,
2234 u64 start, unsigned long len);
2235 struct btrfs_csum_item *btrfs_lookup_csum(struct btrfs_trans_handle *trans,
2236 struct btrfs_root *root,
2237 struct btrfs_path *path,
2238 u64 bytenr, int cow);
2239 int btrfs_csum_truncate(struct btrfs_trans_handle *trans,
2240 struct btrfs_root *root, struct btrfs_path *path,
2242 int btrfs_lookup_csums_range(struct btrfs_root *root, u64 start,
2243 u64 end, struct list_head *list);
2246 /* RHEL and EL kernels have a patch that renames PG_checked to FsMisc */
2247 #if defined(ClearPageFsMisc) && !defined(ClearPageChecked)
2248 #define ClearPageChecked ClearPageFsMisc
2249 #define SetPageChecked SetPageFsMisc
2250 #define PageChecked PageFsMisc
2253 struct inode *btrfs_lookup_dentry(struct inode *dir, struct dentry *dentry);
2254 int btrfs_set_inode_index(struct inode *dir, u64 *index);
2255 int btrfs_unlink_inode(struct btrfs_trans_handle *trans,
2256 struct btrfs_root *root,
2257 struct inode *dir, struct inode *inode,
2258 const char *name, int name_len);
2259 int btrfs_add_link(struct btrfs_trans_handle *trans,
2260 struct inode *parent_inode, struct inode *inode,
2261 const char *name, int name_len, int add_backref, u64 index);
2262 int btrfs_unlink_subvol(struct btrfs_trans_handle *trans,
2263 struct btrfs_root *root,
2264 struct inode *dir, u64 objectid,
2265 const char *name, int name_len);
2266 int btrfs_truncate_inode_items(struct btrfs_trans_handle *trans,
2267 struct btrfs_root *root,
2268 struct inode *inode, u64 new_size,
2271 int btrfs_start_delalloc_inodes(struct btrfs_root *root);
2272 int btrfs_set_extent_delalloc(struct inode *inode, u64 start, u64 end);
2273 int btrfs_writepages(struct address_space *mapping,
2274 struct writeback_control *wbc);
2275 int btrfs_create_subvol_root(struct btrfs_trans_handle *trans,
2276 struct btrfs_root *new_root, struct dentry *dentry,
2277 u64 new_dirid, u64 alloc_hint);
2278 int btrfs_merge_bio_hook(struct page *page, unsigned long offset,
2279 size_t size, struct bio *bio, unsigned long bio_flags);
2281 unsigned long btrfs_force_ra(struct address_space *mapping,
2282 struct file_ra_state *ra, struct file *file,
2283 pgoff_t offset, pgoff_t last_index);
2284 int btrfs_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf);
2285 int btrfs_readpage(struct file *file, struct page *page);
2286 void btrfs_delete_inode(struct inode *inode);
2287 void btrfs_put_inode(struct inode *inode);
2288 int btrfs_write_inode(struct inode *inode, int wait);
2289 void btrfs_dirty_inode(struct inode *inode);
2290 struct inode *btrfs_alloc_inode(struct super_block *sb);
2291 void btrfs_destroy_inode(struct inode *inode);
2292 int btrfs_init_cachep(void);
2293 void btrfs_destroy_cachep(void);
2294 long btrfs_ioctl_trans_end(struct file *file);
2295 struct inode *btrfs_iget(struct super_block *s, struct btrfs_key *location,
2296 struct btrfs_root *root);
2297 int btrfs_commit_write(struct file *file, struct page *page,
2298 unsigned from, unsigned to);
2299 struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page,
2300 size_t page_offset, u64 start, u64 end,
2302 int btrfs_update_inode(struct btrfs_trans_handle *trans,
2303 struct btrfs_root *root,
2304 struct inode *inode);
2305 int btrfs_orphan_add(struct btrfs_trans_handle *trans, struct inode *inode);
2306 int btrfs_orphan_del(struct btrfs_trans_handle *trans, struct inode *inode);
2307 void btrfs_orphan_cleanup(struct btrfs_root *root);
2308 int btrfs_cont_expand(struct inode *inode, loff_t size);
2311 long btrfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
2312 void btrfs_update_iflags(struct inode *inode);
2313 void btrfs_inherit_iflags(struct inode *inode, struct inode *dir);
2316 int btrfs_sync_file(struct file *file, struct dentry *dentry, int datasync);
2317 int btrfs_drop_extent_cache(struct inode *inode, u64 start, u64 end,
2319 int btrfs_check_file(struct btrfs_root *root, struct inode *inode);
2320 extern struct file_operations btrfs_file_operations;
2321 int btrfs_drop_extents(struct btrfs_trans_handle *trans,
2322 struct btrfs_root *root, struct inode *inode,
2323 u64 start, u64 end, u64 locked_end,
2324 u64 inline_limit, u64 *hint_block, int drop_cache);
2325 int btrfs_mark_extent_written(struct btrfs_trans_handle *trans,
2326 struct btrfs_root *root,
2327 struct inode *inode, u64 start, u64 end);
2328 int btrfs_release_file(struct inode *inode, struct file *file);
2331 int btrfs_defrag_leaves(struct btrfs_trans_handle *trans,
2332 struct btrfs_root *root, int cache_only);
2335 int btrfs_init_sysfs(void);
2336 void btrfs_exit_sysfs(void);
2337 int btrfs_sysfs_add_super(struct btrfs_fs_info *fs);
2338 int btrfs_sysfs_add_root(struct btrfs_root *root);
2339 void btrfs_sysfs_del_root(struct btrfs_root *root);
2340 void btrfs_sysfs_del_super(struct btrfs_fs_info *root);
2343 ssize_t btrfs_listxattr(struct dentry *dentry, char *buffer, size_t size);
2346 u64 btrfs_parse_size(char *str);
2347 int btrfs_parse_options(struct btrfs_root *root, char *options);
2348 int btrfs_sync_fs(struct super_block *sb, int wait);
2351 #ifdef CONFIG_FS_POSIX_ACL
2352 int btrfs_check_acl(struct inode *inode, int mask);
2354 #define btrfs_check_acl NULL
2356 int btrfs_init_acl(struct inode *inode, struct inode *dir);
2357 int btrfs_acl_chmod(struct inode *inode);
2360 int btrfs_relocate_block_group(struct btrfs_root *root, u64 group_start);
2361 int btrfs_init_reloc_root(struct btrfs_trans_handle *trans,
2362 struct btrfs_root *root);
2363 int btrfs_update_reloc_root(struct btrfs_trans_handle *trans,
2364 struct btrfs_root *root);
2365 int btrfs_recover_relocation(struct btrfs_root *root);
2366 int btrfs_reloc_clone_csums(struct inode *inode, u64 file_pos, u64 len);