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 <linux/slab.h>
30 #include <asm/kmap_types.h>
31 #include "extent_io.h"
32 #include "extent_map.h"
33 #include "async-thread.h"
35 struct btrfs_trans_handle;
36 struct btrfs_transaction;
37 extern struct kmem_cache *btrfs_trans_handle_cachep;
38 extern struct kmem_cache *btrfs_transaction_cachep;
39 extern struct kmem_cache *btrfs_bit_radix_cachep;
40 extern struct kmem_cache *btrfs_path_cachep;
41 struct btrfs_ordered_sum;
43 #define BTRFS_MAGIC "_BHRfS_M"
45 #define BTRFS_MAX_LEVEL 8
47 #define BTRFS_COMPAT_EXTENT_TREE_V0
50 * files bigger than this get some pre-flushing when they are added
51 * to the ordered operations list. That way we limit the total
52 * work done by the commit
54 #define BTRFS_ORDERED_OPERATIONS_FLUSH_LIMIT (8 * 1024 * 1024)
56 /* holds pointers to all of the tree roots */
57 #define BTRFS_ROOT_TREE_OBJECTID 1ULL
59 /* stores information about which extents are in use, and reference counts */
60 #define BTRFS_EXTENT_TREE_OBJECTID 2ULL
63 * chunk tree stores translations from logical -> physical block numbering
64 * the super block points to the chunk tree
66 #define BTRFS_CHUNK_TREE_OBJECTID 3ULL
69 * stores information about which areas of a given device are in use.
70 * one per device. The tree of tree roots points to the device tree
72 #define BTRFS_DEV_TREE_OBJECTID 4ULL
74 /* one per subvolume, storing files and directories */
75 #define BTRFS_FS_TREE_OBJECTID 5ULL
77 /* directory objectid inside the root tree */
78 #define BTRFS_ROOT_TREE_DIR_OBJECTID 6ULL
80 /* holds checksums of all the data extents */
81 #define BTRFS_CSUM_TREE_OBJECTID 7ULL
83 /* orhpan objectid for tracking unlinked/truncated files */
84 #define BTRFS_ORPHAN_OBJECTID -5ULL
86 /* does write ahead logging to speed up fsyncs */
87 #define BTRFS_TREE_LOG_OBJECTID -6ULL
88 #define BTRFS_TREE_LOG_FIXUP_OBJECTID -7ULL
90 /* for space balancing */
91 #define BTRFS_TREE_RELOC_OBJECTID -8ULL
92 #define BTRFS_DATA_RELOC_TREE_OBJECTID -9ULL
95 * extent checksums all have this objectid
96 * this allows them to share the logging tree
99 #define BTRFS_EXTENT_CSUM_OBJECTID -10ULL
101 /* dummy objectid represents multiple objectids */
102 #define BTRFS_MULTIPLE_OBJECTIDS -255ULL
105 * All files have objectids in this range.
107 #define BTRFS_FIRST_FREE_OBJECTID 256ULL
108 #define BTRFS_LAST_FREE_OBJECTID -256ULL
109 #define BTRFS_FIRST_CHUNK_TREE_OBJECTID 256ULL
113 * the device items go into the chunk tree. The key is in the form
114 * [ 1 BTRFS_DEV_ITEM_KEY device_id ]
116 #define BTRFS_DEV_ITEMS_OBJECTID 1ULL
118 #define BTRFS_BTREE_INODE_OBJECTID 1
120 #define BTRFS_EMPTY_SUBVOL_DIR_OBJECTID 2
123 * we can actually store much bigger names, but lets not confuse the rest
126 #define BTRFS_NAME_LEN 255
128 /* 32 bytes in various csum fields */
129 #define BTRFS_CSUM_SIZE 32
132 #define BTRFS_CSUM_TYPE_CRC32 0
134 static int btrfs_csum_sizes[] = { 4, 0 };
136 /* four bytes for CRC32 */
137 #define BTRFS_EMPTY_DIR_SIZE 0
139 #define BTRFS_FT_UNKNOWN 0
140 #define BTRFS_FT_REG_FILE 1
141 #define BTRFS_FT_DIR 2
142 #define BTRFS_FT_CHRDEV 3
143 #define BTRFS_FT_BLKDEV 4
144 #define BTRFS_FT_FIFO 5
145 #define BTRFS_FT_SOCK 6
146 #define BTRFS_FT_SYMLINK 7
147 #define BTRFS_FT_XATTR 8
148 #define BTRFS_FT_MAX 9
151 * The key defines the order in the tree, and so it also defines (optimal)
154 * objectid corresponds to the inode number.
156 * type tells us things about the object, and is a kind of stream selector.
157 * so for a given inode, keys with type of 1 might refer to the inode data,
158 * type of 2 may point to file data in the btree and type == 3 may point to
161 * offset is the starting byte offset for this key in the stream.
163 * btrfs_disk_key is in disk byte order. struct btrfs_key is always
164 * in cpu native order. Otherwise they are identical and their sizes
165 * should be the same (ie both packed)
167 struct btrfs_disk_key {
171 } __attribute__ ((__packed__));
177 } __attribute__ ((__packed__));
179 struct btrfs_mapping_tree {
180 struct extent_map_tree map_tree;
183 #define BTRFS_UUID_SIZE 16
184 struct btrfs_dev_item {
185 /* the internal btrfs device id */
188 /* size of the device */
194 /* optimal io alignment for this device */
197 /* optimal io width for this device */
200 /* minimal io size for this device */
203 /* type and info about this device */
206 /* expected generation for this device */
210 * starting byte of this partition on the device,
211 * to allow for stripe alignment in the future
215 /* grouping information for allocation decisions */
218 /* seek speed 0-100 where 100 is fastest */
221 /* bandwidth 0-100 where 100 is fastest */
224 /* btrfs generated uuid for this device */
225 u8 uuid[BTRFS_UUID_SIZE];
227 /* uuid of FS who owns this device */
228 u8 fsid[BTRFS_UUID_SIZE];
229 } __attribute__ ((__packed__));
231 struct btrfs_stripe {
234 u8 dev_uuid[BTRFS_UUID_SIZE];
235 } __attribute__ ((__packed__));
238 /* size of this chunk in bytes */
241 /* objectid of the root referencing this chunk */
247 /* optimal io alignment for this chunk */
250 /* optimal io width for this chunk */
253 /* minimal io size for this chunk */
256 /* 2^16 stripes is quite a lot, a second limit is the size of a single
261 /* sub stripes only matter for raid10 */
263 struct btrfs_stripe stripe;
264 /* additional stripes go here */
265 } __attribute__ ((__packed__));
267 static inline unsigned long btrfs_chunk_item_size(int num_stripes)
269 BUG_ON(num_stripes == 0);
270 return sizeof(struct btrfs_chunk) +
271 sizeof(struct btrfs_stripe) * (num_stripes - 1);
274 #define BTRFS_FSID_SIZE 16
275 #define BTRFS_HEADER_FLAG_WRITTEN (1ULL << 0)
276 #define BTRFS_HEADER_FLAG_RELOC (1ULL << 1)
277 #define BTRFS_SUPER_FLAG_SEEDING (1ULL << 32)
278 #define BTRFS_SUPER_FLAG_METADUMP (1ULL << 33)
280 #define BTRFS_BACKREF_REV_MAX 256
281 #define BTRFS_BACKREF_REV_SHIFT 56
282 #define BTRFS_BACKREF_REV_MASK (((u64)BTRFS_BACKREF_REV_MAX - 1) << \
283 BTRFS_BACKREF_REV_SHIFT)
285 #define BTRFS_OLD_BACKREF_REV 0
286 #define BTRFS_MIXED_BACKREF_REV 1
289 * every tree block (leaf or node) starts with this header.
291 struct btrfs_header {
292 /* these first four must match the super block */
293 u8 csum[BTRFS_CSUM_SIZE];
294 u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
295 __le64 bytenr; /* which block this node is supposed to live in */
298 /* allowed to be different from the super from here on down */
299 u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
304 } __attribute__ ((__packed__));
306 #define BTRFS_NODEPTRS_PER_BLOCK(r) (((r)->nodesize - \
307 sizeof(struct btrfs_header)) / \
308 sizeof(struct btrfs_key_ptr))
309 #define __BTRFS_LEAF_DATA_SIZE(bs) ((bs) - sizeof(struct btrfs_header))
310 #define BTRFS_LEAF_DATA_SIZE(r) (__BTRFS_LEAF_DATA_SIZE(r->leafsize))
311 #define BTRFS_MAX_INLINE_DATA_SIZE(r) (BTRFS_LEAF_DATA_SIZE(r) - \
312 sizeof(struct btrfs_item) - \
313 sizeof(struct btrfs_file_extent_item))
314 #define BTRFS_MAX_XATTR_SIZE(r) (BTRFS_LEAF_DATA_SIZE(r) - \
315 sizeof(struct btrfs_item) -\
316 sizeof(struct btrfs_dir_item))
320 * this is a very generous portion of the super block, giving us
321 * room to translate 14 chunks with 3 stripes each.
323 #define BTRFS_SYSTEM_CHUNK_ARRAY_SIZE 2048
324 #define BTRFS_LABEL_SIZE 256
327 * the super block basically lists the main trees of the FS
328 * it currently lacks any block count etc etc
330 struct btrfs_super_block {
331 u8 csum[BTRFS_CSUM_SIZE];
332 /* the first 4 fields must match struct btrfs_header */
333 u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
334 __le64 bytenr; /* this block number */
337 /* allowed to be different from the btrfs_header from here own down */
344 /* this will help find the new super based on the log root */
345 __le64 log_root_transid;
348 __le64 root_dir_objectid;
354 __le32 sys_chunk_array_size;
355 __le64 chunk_root_generation;
357 __le64 compat_ro_flags;
358 __le64 incompat_flags;
363 struct btrfs_dev_item dev_item;
365 char label[BTRFS_LABEL_SIZE];
367 /* future expansion */
369 u8 sys_chunk_array[BTRFS_SYSTEM_CHUNK_ARRAY_SIZE];
370 } __attribute__ ((__packed__));
373 * Compat flags that we support. If any incompat flags are set other than the
374 * ones specified below then we will fail to mount
376 #define BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF (1ULL << 0)
377 #define BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL (2ULL << 0)
379 #define BTRFS_FEATURE_COMPAT_SUPP 0ULL
380 #define BTRFS_FEATURE_COMPAT_RO_SUPP 0ULL
381 #define BTRFS_FEATURE_INCOMPAT_SUPP \
382 (BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF | \
383 BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL)
386 * A leaf is full of items. offset and size tell us where to find
387 * the item in the leaf (relative to the start of the data area)
390 struct btrfs_disk_key key;
393 } __attribute__ ((__packed__));
396 * leaves have an item area and a data area:
397 * [item0, item1....itemN] [free space] [dataN...data1, data0]
399 * The data is separate from the items to get the keys closer together
403 struct btrfs_header header;
404 struct btrfs_item items[];
405 } __attribute__ ((__packed__));
408 * all non-leaf blocks are nodes, they hold only keys and pointers to
411 struct btrfs_key_ptr {
412 struct btrfs_disk_key key;
415 } __attribute__ ((__packed__));
418 struct btrfs_header header;
419 struct btrfs_key_ptr ptrs[];
420 } __attribute__ ((__packed__));
423 * btrfs_paths remember the path taken from the root down to the leaf.
424 * level 0 is always the leaf, and nodes[1...BTRFS_MAX_LEVEL] will point
425 * to any other levels that are present.
427 * The slots array records the index of the item or block pointer
428 * used while walking the tree.
431 struct extent_buffer *nodes[BTRFS_MAX_LEVEL];
432 int slots[BTRFS_MAX_LEVEL];
433 /* if there is real range locking, this locks field will change */
434 int locks[BTRFS_MAX_LEVEL];
436 /* keep some upper locks as we walk down */
440 * set by btrfs_split_item, tells search_slot to keep all locks
441 * and to force calls to keep space in the nodes
443 unsigned int search_for_split:1;
444 unsigned int keep_locks:1;
445 unsigned int skip_locking:1;
446 unsigned int leave_spinning:1;
447 unsigned int search_commit_root:1;
451 * items in the extent btree are used to record the objectid of the
452 * owner of the block and the number of references
455 struct btrfs_extent_item {
459 } __attribute__ ((__packed__));
461 struct btrfs_extent_item_v0 {
463 } __attribute__ ((__packed__));
465 #define BTRFS_MAX_EXTENT_ITEM_SIZE(r) ((BTRFS_LEAF_DATA_SIZE(r) >> 4) - \
466 sizeof(struct btrfs_item))
468 #define BTRFS_EXTENT_FLAG_DATA (1ULL << 0)
469 #define BTRFS_EXTENT_FLAG_TREE_BLOCK (1ULL << 1)
471 /* following flags only apply to tree blocks */
473 /* use full backrefs for extent pointers in the block */
474 #define BTRFS_BLOCK_FLAG_FULL_BACKREF (1ULL << 8)
476 struct btrfs_tree_block_info {
477 struct btrfs_disk_key key;
479 } __attribute__ ((__packed__));
481 struct btrfs_extent_data_ref {
486 } __attribute__ ((__packed__));
488 struct btrfs_shared_data_ref {
490 } __attribute__ ((__packed__));
492 struct btrfs_extent_inline_ref {
495 } __attribute__ ((__packed__));
497 /* old style backrefs item */
498 struct btrfs_extent_ref_v0 {
503 } __attribute__ ((__packed__));
506 /* dev extents record free space on individual devices. The owner
507 * field points back to the chunk allocation mapping tree that allocated
508 * the extent. The chunk tree uuid field is a way to double check the owner
510 struct btrfs_dev_extent {
512 __le64 chunk_objectid;
515 u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
516 } __attribute__ ((__packed__));
518 struct btrfs_inode_ref {
522 } __attribute__ ((__packed__));
524 struct btrfs_timespec {
527 } __attribute__ ((__packed__));
529 enum btrfs_compression_type {
530 BTRFS_COMPRESS_NONE = 0,
531 BTRFS_COMPRESS_ZLIB = 1,
532 BTRFS_COMPRESS_LAST = 2,
535 struct btrfs_inode_item {
536 /* nfs style generation number */
538 /* transid that last touched this inode */
550 /* modification sequence number for NFS */
554 * a little future expansion, for more than this we can
555 * just grow the inode item and version it
558 struct btrfs_timespec atime;
559 struct btrfs_timespec ctime;
560 struct btrfs_timespec mtime;
561 struct btrfs_timespec otime;
562 } __attribute__ ((__packed__));
564 struct btrfs_dir_log_item {
566 } __attribute__ ((__packed__));
568 struct btrfs_dir_item {
569 struct btrfs_disk_key location;
574 } __attribute__ ((__packed__));
576 struct btrfs_root_item {
577 struct btrfs_inode_item inode;
583 __le64 last_snapshot;
586 struct btrfs_disk_key drop_progress;
589 } __attribute__ ((__packed__));
592 * this is used for both forward and backward root refs
594 struct btrfs_root_ref {
598 } __attribute__ ((__packed__));
600 #define BTRFS_FILE_EXTENT_INLINE 0
601 #define BTRFS_FILE_EXTENT_REG 1
602 #define BTRFS_FILE_EXTENT_PREALLOC 2
604 struct btrfs_file_extent_item {
606 * transaction id that created this extent
610 * max number of bytes to hold this extent in ram
611 * when we split a compressed extent we can't know how big
612 * each of the resulting pieces will be. So, this is
613 * an upper limit on the size of the extent in ram instead of
619 * 32 bits for the various ways we might encode the data,
620 * including compression and encryption. If any of these
621 * are set to something a given disk format doesn't understand
622 * it is treated like an incompat flag for reading and writing,
627 __le16 other_encoding; /* spare for later use */
629 /* are we inline data or a real extent? */
633 * disk space consumed by the extent, checksum blocks are included
637 __le64 disk_num_bytes;
639 * the logical offset in file blocks (no csums)
640 * this extent record is for. This allows a file extent to point
641 * into the middle of an existing extent on disk, sharing it
642 * between two snapshots (useful if some bytes in the middle of the
643 * extent have changed
647 * the logical number of file blocks (no csums included). This
648 * always reflects the size uncompressed and without encoding.
652 } __attribute__ ((__packed__));
654 struct btrfs_csum_item {
656 } __attribute__ ((__packed__));
658 /* different types of block groups (and chunks) */
659 #define BTRFS_BLOCK_GROUP_DATA (1 << 0)
660 #define BTRFS_BLOCK_GROUP_SYSTEM (1 << 1)
661 #define BTRFS_BLOCK_GROUP_METADATA (1 << 2)
662 #define BTRFS_BLOCK_GROUP_RAID0 (1 << 3)
663 #define BTRFS_BLOCK_GROUP_RAID1 (1 << 4)
664 #define BTRFS_BLOCK_GROUP_DUP (1 << 5)
665 #define BTRFS_BLOCK_GROUP_RAID10 (1 << 6)
666 #define BTRFS_NR_RAID_TYPES 5
668 struct btrfs_block_group_item {
670 __le64 chunk_objectid;
672 } __attribute__ ((__packed__));
674 struct btrfs_space_info {
677 u64 total_bytes; /* total bytes in the space */
678 u64 bytes_used; /* total bytes used,
679 this does't take mirrors into account */
680 u64 bytes_pinned; /* total bytes pinned, will be freed when the
681 transaction finishes */
682 u64 bytes_reserved; /* total bytes the allocator has reserved for
683 current allocations */
684 u64 bytes_readonly; /* total bytes that are read only */
685 u64 bytes_super; /* total bytes reserved for the super blocks */
686 u64 bytes_root; /* the number of bytes needed to commit a
688 u64 bytes_may_use; /* number of bytes that may be used for
689 delalloc/allocations */
690 u64 bytes_delalloc; /* number of bytes currently reserved for
691 delayed allocation */
692 u64 disk_used; /* total bytes used on disk */
694 int full; /* indicates that we cannot allocate any more
695 chunks for this space */
696 int force_alloc; /* set if we need to force a chunk alloc for
698 int force_delalloc; /* make people start doing filemap_flush until
699 we're under a threshold */
701 struct list_head list;
703 /* for block groups in our same type */
704 struct list_head block_groups[BTRFS_NR_RAID_TYPES];
706 struct rw_semaphore groups_sem;
707 atomic_t caching_threads;
711 * free clusters are used to claim free space in relatively large chunks,
712 * allowing us to do less seeky writes. They are used for all metadata
713 * allocations and data allocations in ssd mode.
715 struct btrfs_free_cluster {
717 spinlock_t refill_lock;
720 /* largest extent in this cluster */
723 /* first extent starting offset */
726 /* if this cluster simply points at a bitmap in the block group */
727 bool points_to_bitmap;
729 struct btrfs_block_group_cache *block_group;
731 * when a cluster is allocated from a block group, we put the
732 * cluster onto a list in the block group so that it can
733 * be freed before the block group is freed.
735 struct list_head block_group_list;
738 enum btrfs_caching_type {
740 BTRFS_CACHE_STARTED = 1,
741 BTRFS_CACHE_FINISHED = 2,
744 struct btrfs_caching_control {
745 struct list_head list;
747 wait_queue_head_t wait;
748 struct btrfs_block_group_cache *block_group;
753 struct btrfs_block_group_cache {
754 struct btrfs_key key;
755 struct btrfs_block_group_item item;
756 struct btrfs_fs_info *fs_info;
769 /* cache tracking stuff */
771 struct btrfs_caching_control *caching_ctl;
772 u64 last_byte_to_unpin;
774 struct btrfs_space_info *space_info;
776 /* free space cache stuff */
777 spinlock_t tree_lock;
778 struct rb_root free_space_offset;
781 /* block group cache stuff */
782 struct rb_node cache_node;
784 /* for block groups in the same raid type */
785 struct list_head list;
790 /* List of struct btrfs_free_clusters for this block group.
791 * Today it will only have one thing on it, but that may change
793 struct list_head cluster_list;
796 struct reloc_control;
798 struct btrfs_fs_devices;
799 struct btrfs_fs_info {
800 u8 fsid[BTRFS_FSID_SIZE];
801 u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
802 struct btrfs_root *extent_root;
803 struct btrfs_root *tree_root;
804 struct btrfs_root *chunk_root;
805 struct btrfs_root *dev_root;
806 struct btrfs_root *fs_root;
807 struct btrfs_root *csum_root;
809 /* the log root tree is a directory of all the other log roots */
810 struct btrfs_root *log_root_tree;
812 spinlock_t fs_roots_radix_lock;
813 struct radix_tree_root fs_roots_radix;
815 /* block group cache stuff */
816 spinlock_t block_group_cache_lock;
817 struct rb_root block_group_cache_tree;
819 struct extent_io_tree freed_extents[2];
820 struct extent_io_tree *pinned_extents;
822 /* logical->physical extent mapping */
823 struct btrfs_mapping_tree mapping_tree;
826 u64 last_trans_committed;
829 * this is updated to the current trans every time a full commit
830 * is required instead of the faster short fsync log commits
832 u64 last_trans_log_full_commit;
833 u64 open_ioctl_trans;
834 unsigned long mount_opt;
837 struct btrfs_transaction *running_transaction;
838 wait_queue_head_t transaction_throttle;
839 wait_queue_head_t transaction_wait;
840 wait_queue_head_t async_submit_wait;
842 struct btrfs_super_block super_copy;
843 struct btrfs_super_block super_for_commit;
844 struct block_device *__bdev;
845 struct super_block *sb;
846 struct inode *btree_inode;
847 struct backing_dev_info bdi;
848 struct mutex trans_mutex;
849 struct mutex tree_log_mutex;
850 struct mutex transaction_kthread_mutex;
851 struct mutex cleaner_mutex;
852 struct mutex chunk_mutex;
853 struct mutex volume_mutex;
855 * this protects the ordered operations list only while we are
856 * processing all of the entries on it. This way we make
857 * sure the commit code doesn't find the list temporarily empty
858 * because another function happens to be doing non-waiting preflush
859 * before jumping into the main commit.
861 struct mutex ordered_operations_mutex;
862 struct rw_semaphore extent_commit_sem;
864 struct rw_semaphore cleanup_work_sem;
866 struct rw_semaphore subvol_sem;
867 struct srcu_struct subvol_srcu;
869 struct list_head trans_list;
870 struct list_head hashers;
871 struct list_head dead_roots;
872 struct list_head caching_block_groups;
874 spinlock_t delayed_iput_lock;
875 struct list_head delayed_iputs;
877 atomic_t nr_async_submits;
878 atomic_t async_submit_draining;
879 atomic_t nr_async_bios;
880 atomic_t async_delalloc_pages;
883 * this is used by the balancing code to wait for all the pending
886 spinlock_t ordered_extent_lock;
889 * all of the data=ordered extents pending writeback
890 * these can span multiple transactions and basically include
891 * every dirty data page that isn't from nodatacow
893 struct list_head ordered_extents;
896 * all of the inodes that have delalloc bytes. It is possible for
897 * this list to be empty even when there is still dirty data=ordered
898 * extents waiting to finish IO.
900 struct list_head delalloc_inodes;
903 * special rename and truncate targets that must be on disk before
904 * we're allowed to commit. This is basically the ext3 style
907 struct list_head ordered_operations;
910 * there is a pool of worker threads for checksumming during writes
911 * and a pool for checksumming after reads. This is because readers
912 * can run with FS locks held, and the writers may be waiting for
913 * those locks. We don't want ordering in the pending list to cause
914 * deadlocks, and so the two are serviced separately.
916 * A third pool does submit_bio to avoid deadlocking with the other
919 struct btrfs_workers generic_worker;
920 struct btrfs_workers workers;
921 struct btrfs_workers delalloc_workers;
922 struct btrfs_workers endio_workers;
923 struct btrfs_workers endio_meta_workers;
924 struct btrfs_workers endio_meta_write_workers;
925 struct btrfs_workers endio_write_workers;
926 struct btrfs_workers submit_workers;
928 * fixup workers take dirty pages that didn't properly go through
929 * the cow mechanism and make them safe to write. It happens
930 * for the sys_munmap function call path
932 struct btrfs_workers fixup_workers;
933 struct task_struct *transaction_kthread;
934 struct task_struct *cleaner_kthread;
935 int thread_pool_size;
937 struct kobject super_kobj;
938 struct completion kobj_unregister;
941 int log_root_recovering;
945 /* protected by the delalloc lock, used to keep from writing
946 * metadata until there is a nice batch
948 u64 dirty_metadata_bytes;
949 struct list_head dirty_cowonly_roots;
951 struct btrfs_fs_devices *fs_devices;
954 * the space_info list is almost entirely read only. It only changes
955 * when we add a new raid type to the FS, and that happens
956 * very rarely. RCU is used to protect it.
958 struct list_head space_info;
960 struct reloc_control *reloc_ctl;
962 spinlock_t delalloc_lock;
963 spinlock_t new_trans_lock;
966 /* data_alloc_cluster is only used in ssd mode */
967 struct btrfs_free_cluster data_alloc_cluster;
969 /* all metadata allocations go through this cluster */
970 struct btrfs_free_cluster meta_alloc_cluster;
972 spinlock_t ref_cache_lock;
973 u64 total_ref_cache_size;
975 u64 avail_data_alloc_bits;
976 u64 avail_metadata_alloc_bits;
977 u64 avail_system_alloc_bits;
978 u64 data_alloc_profile;
979 u64 metadata_alloc_profile;
980 u64 system_alloc_profile;
982 unsigned data_chunk_allocations;
983 unsigned metadata_ratio;
989 * in ram representation of the tree. extent_root is used for all allocations
990 * and for the extent tree extent_root root.
993 struct extent_buffer *node;
995 /* the node lock is held while changing the node pointer */
996 spinlock_t node_lock;
998 struct extent_buffer *commit_root;
999 struct btrfs_root *log_root;
1000 struct btrfs_root *reloc_root;
1002 struct btrfs_root_item root_item;
1003 struct btrfs_key root_key;
1004 struct btrfs_fs_info *fs_info;
1005 struct extent_io_tree dirty_log_pages;
1007 struct kobject root_kobj;
1008 struct completion kobj_unregister;
1009 struct mutex objectid_mutex;
1011 struct mutex log_mutex;
1012 wait_queue_head_t log_writer_wait;
1013 wait_queue_head_t log_commit_wait[2];
1014 atomic_t log_writers;
1015 atomic_t log_commit[2];
1016 unsigned long log_transid;
1017 unsigned long last_log_commit;
1018 unsigned long log_batch;
1019 pid_t log_start_pid;
1020 bool log_multiple_pids;
1025 /* data allocations are done in sectorsize units */
1028 /* node allocations are done in nodesize units */
1031 /* leaf allocations are done in leafsize units */
1038 u64 highest_objectid;
1044 u64 defrag_trans_start;
1045 struct btrfs_key defrag_progress;
1046 struct btrfs_key defrag_max;
1051 /* the dirty list is only used by non-reference counted roots */
1052 struct list_head dirty_list;
1054 struct list_head root_list;
1056 spinlock_t list_lock;
1057 struct list_head orphan_list;
1059 spinlock_t inode_lock;
1060 /* red-black tree that keeps track of in-memory inodes */
1061 struct rb_root inode_tree;
1064 * right now this just gets used so that a root has its own devid
1065 * for stat. It may be used for more later
1067 struct super_block anon_super;
1071 * inode items have the data typically returned from stat and store other
1072 * info about object characteristics. There is one for every file and dir in
1075 #define BTRFS_INODE_ITEM_KEY 1
1076 #define BTRFS_INODE_REF_KEY 12
1077 #define BTRFS_XATTR_ITEM_KEY 24
1078 #define BTRFS_ORPHAN_ITEM_KEY 48
1079 /* reserve 2-15 close to the inode for later flexibility */
1082 * dir items are the name -> inode pointers in a directory. There is one
1083 * for every name in a directory.
1085 #define BTRFS_DIR_LOG_ITEM_KEY 60
1086 #define BTRFS_DIR_LOG_INDEX_KEY 72
1087 #define BTRFS_DIR_ITEM_KEY 84
1088 #define BTRFS_DIR_INDEX_KEY 96
1090 * extent data is for file data
1092 #define BTRFS_EXTENT_DATA_KEY 108
1095 * extent csums are stored in a separate tree and hold csums for
1096 * an entire extent on disk.
1098 #define BTRFS_EXTENT_CSUM_KEY 128
1101 * root items point to tree roots. They are typically in the root
1102 * tree used by the super block to find all the other trees
1104 #define BTRFS_ROOT_ITEM_KEY 132
1107 * root backrefs tie subvols and snapshots to the directory entries that
1110 #define BTRFS_ROOT_BACKREF_KEY 144
1113 * root refs make a fast index for listing all of the snapshots and
1114 * subvolumes referenced by a given root. They point directly to the
1115 * directory item in the root that references the subvol
1117 #define BTRFS_ROOT_REF_KEY 156
1120 * extent items are in the extent map tree. These record which blocks
1121 * are used, and how many references there are to each block
1123 #define BTRFS_EXTENT_ITEM_KEY 168
1125 #define BTRFS_TREE_BLOCK_REF_KEY 176
1127 #define BTRFS_EXTENT_DATA_REF_KEY 178
1129 #define BTRFS_EXTENT_REF_V0_KEY 180
1131 #define BTRFS_SHARED_BLOCK_REF_KEY 182
1133 #define BTRFS_SHARED_DATA_REF_KEY 184
1136 * block groups give us hints into the extent allocation trees. Which
1137 * blocks are free etc etc
1139 #define BTRFS_BLOCK_GROUP_ITEM_KEY 192
1141 #define BTRFS_DEV_EXTENT_KEY 204
1142 #define BTRFS_DEV_ITEM_KEY 216
1143 #define BTRFS_CHUNK_ITEM_KEY 228
1146 * string items are for debugging. They just store a short string of
1149 #define BTRFS_STRING_ITEM_KEY 253
1151 #define BTRFS_MOUNT_NODATASUM (1 << 0)
1152 #define BTRFS_MOUNT_NODATACOW (1 << 1)
1153 #define BTRFS_MOUNT_NOBARRIER (1 << 2)
1154 #define BTRFS_MOUNT_SSD (1 << 3)
1155 #define BTRFS_MOUNT_DEGRADED (1 << 4)
1156 #define BTRFS_MOUNT_COMPRESS (1 << 5)
1157 #define BTRFS_MOUNT_NOTREELOG (1 << 6)
1158 #define BTRFS_MOUNT_FLUSHONCOMMIT (1 << 7)
1159 #define BTRFS_MOUNT_SSD_SPREAD (1 << 8)
1160 #define BTRFS_MOUNT_NOSSD (1 << 9)
1161 #define BTRFS_MOUNT_DISCARD (1 << 10)
1162 #define BTRFS_MOUNT_FORCE_COMPRESS (1 << 11)
1164 #define btrfs_clear_opt(o, opt) ((o) &= ~BTRFS_MOUNT_##opt)
1165 #define btrfs_set_opt(o, opt) ((o) |= BTRFS_MOUNT_##opt)
1166 #define btrfs_test_opt(root, opt) ((root)->fs_info->mount_opt & \
1171 #define BTRFS_INODE_NODATASUM (1 << 0)
1172 #define BTRFS_INODE_NODATACOW (1 << 1)
1173 #define BTRFS_INODE_READONLY (1 << 2)
1174 #define BTRFS_INODE_NOCOMPRESS (1 << 3)
1175 #define BTRFS_INODE_PREALLOC (1 << 4)
1176 #define BTRFS_INODE_SYNC (1 << 5)
1177 #define BTRFS_INODE_IMMUTABLE (1 << 6)
1178 #define BTRFS_INODE_APPEND (1 << 7)
1179 #define BTRFS_INODE_NODUMP (1 << 8)
1180 #define BTRFS_INODE_NOATIME (1 << 9)
1181 #define BTRFS_INODE_DIRSYNC (1 << 10)
1183 /* some macros to generate set/get funcs for the struct fields. This
1184 * assumes there is a lefoo_to_cpu for every type, so lets make a simple
1187 #define le8_to_cpu(v) (v)
1188 #define cpu_to_le8(v) (v)
1191 #define read_eb_member(eb, ptr, type, member, result) ( \
1192 read_extent_buffer(eb, (char *)(result), \
1193 ((unsigned long)(ptr)) + \
1194 offsetof(type, member), \
1195 sizeof(((type *)0)->member)))
1197 #define write_eb_member(eb, ptr, type, member, result) ( \
1198 write_extent_buffer(eb, (char *)(result), \
1199 ((unsigned long)(ptr)) + \
1200 offsetof(type, member), \
1201 sizeof(((type *)0)->member)))
1203 #ifndef BTRFS_SETGET_FUNCS
1204 #define BTRFS_SETGET_FUNCS(name, type, member, bits) \
1205 u##bits btrfs_##name(struct extent_buffer *eb, type *s); \
1206 void btrfs_set_##name(struct extent_buffer *eb, type *s, u##bits val);
1209 #define BTRFS_SETGET_HEADER_FUNCS(name, type, member, bits) \
1210 static inline u##bits btrfs_##name(struct extent_buffer *eb) \
1212 type *p = kmap_atomic(eb->first_page, KM_USER0); \
1213 u##bits res = le##bits##_to_cpu(p->member); \
1214 kunmap_atomic(p, KM_USER0); \
1217 static inline void btrfs_set_##name(struct extent_buffer *eb, \
1220 type *p = kmap_atomic(eb->first_page, KM_USER0); \
1221 p->member = cpu_to_le##bits(val); \
1222 kunmap_atomic(p, KM_USER0); \
1225 #define BTRFS_SETGET_STACK_FUNCS(name, type, member, bits) \
1226 static inline u##bits btrfs_##name(type *s) \
1228 return le##bits##_to_cpu(s->member); \
1230 static inline void btrfs_set_##name(type *s, u##bits val) \
1232 s->member = cpu_to_le##bits(val); \
1235 BTRFS_SETGET_FUNCS(device_type, struct btrfs_dev_item, type, 64);
1236 BTRFS_SETGET_FUNCS(device_total_bytes, struct btrfs_dev_item, total_bytes, 64);
1237 BTRFS_SETGET_FUNCS(device_bytes_used, struct btrfs_dev_item, bytes_used, 64);
1238 BTRFS_SETGET_FUNCS(device_io_align, struct btrfs_dev_item, io_align, 32);
1239 BTRFS_SETGET_FUNCS(device_io_width, struct btrfs_dev_item, io_width, 32);
1240 BTRFS_SETGET_FUNCS(device_start_offset, struct btrfs_dev_item,
1242 BTRFS_SETGET_FUNCS(device_sector_size, struct btrfs_dev_item, sector_size, 32);
1243 BTRFS_SETGET_FUNCS(device_id, struct btrfs_dev_item, devid, 64);
1244 BTRFS_SETGET_FUNCS(device_group, struct btrfs_dev_item, dev_group, 32);
1245 BTRFS_SETGET_FUNCS(device_seek_speed, struct btrfs_dev_item, seek_speed, 8);
1246 BTRFS_SETGET_FUNCS(device_bandwidth, struct btrfs_dev_item, bandwidth, 8);
1247 BTRFS_SETGET_FUNCS(device_generation, struct btrfs_dev_item, generation, 64);
1249 BTRFS_SETGET_STACK_FUNCS(stack_device_type, struct btrfs_dev_item, type, 64);
1250 BTRFS_SETGET_STACK_FUNCS(stack_device_total_bytes, struct btrfs_dev_item,
1252 BTRFS_SETGET_STACK_FUNCS(stack_device_bytes_used, struct btrfs_dev_item,
1254 BTRFS_SETGET_STACK_FUNCS(stack_device_io_align, struct btrfs_dev_item,
1256 BTRFS_SETGET_STACK_FUNCS(stack_device_io_width, struct btrfs_dev_item,
1258 BTRFS_SETGET_STACK_FUNCS(stack_device_sector_size, struct btrfs_dev_item,
1260 BTRFS_SETGET_STACK_FUNCS(stack_device_id, struct btrfs_dev_item, devid, 64);
1261 BTRFS_SETGET_STACK_FUNCS(stack_device_group, struct btrfs_dev_item,
1263 BTRFS_SETGET_STACK_FUNCS(stack_device_seek_speed, struct btrfs_dev_item,
1265 BTRFS_SETGET_STACK_FUNCS(stack_device_bandwidth, struct btrfs_dev_item,
1267 BTRFS_SETGET_STACK_FUNCS(stack_device_generation, struct btrfs_dev_item,
1270 static inline char *btrfs_device_uuid(struct btrfs_dev_item *d)
1272 return (char *)d + offsetof(struct btrfs_dev_item, uuid);
1275 static inline char *btrfs_device_fsid(struct btrfs_dev_item *d)
1277 return (char *)d + offsetof(struct btrfs_dev_item, fsid);
1280 BTRFS_SETGET_FUNCS(chunk_length, struct btrfs_chunk, length, 64);
1281 BTRFS_SETGET_FUNCS(chunk_owner, struct btrfs_chunk, owner, 64);
1282 BTRFS_SETGET_FUNCS(chunk_stripe_len, struct btrfs_chunk, stripe_len, 64);
1283 BTRFS_SETGET_FUNCS(chunk_io_align, struct btrfs_chunk, io_align, 32);
1284 BTRFS_SETGET_FUNCS(chunk_io_width, struct btrfs_chunk, io_width, 32);
1285 BTRFS_SETGET_FUNCS(chunk_sector_size, struct btrfs_chunk, sector_size, 32);
1286 BTRFS_SETGET_FUNCS(chunk_type, struct btrfs_chunk, type, 64);
1287 BTRFS_SETGET_FUNCS(chunk_num_stripes, struct btrfs_chunk, num_stripes, 16);
1288 BTRFS_SETGET_FUNCS(chunk_sub_stripes, struct btrfs_chunk, sub_stripes, 16);
1289 BTRFS_SETGET_FUNCS(stripe_devid, struct btrfs_stripe, devid, 64);
1290 BTRFS_SETGET_FUNCS(stripe_offset, struct btrfs_stripe, offset, 64);
1292 static inline char *btrfs_stripe_dev_uuid(struct btrfs_stripe *s)
1294 return (char *)s + offsetof(struct btrfs_stripe, dev_uuid);
1297 BTRFS_SETGET_STACK_FUNCS(stack_chunk_length, struct btrfs_chunk, length, 64);
1298 BTRFS_SETGET_STACK_FUNCS(stack_chunk_owner, struct btrfs_chunk, owner, 64);
1299 BTRFS_SETGET_STACK_FUNCS(stack_chunk_stripe_len, struct btrfs_chunk,
1301 BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_align, struct btrfs_chunk,
1303 BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_width, struct btrfs_chunk,
1305 BTRFS_SETGET_STACK_FUNCS(stack_chunk_sector_size, struct btrfs_chunk,
1307 BTRFS_SETGET_STACK_FUNCS(stack_chunk_type, struct btrfs_chunk, type, 64);
1308 BTRFS_SETGET_STACK_FUNCS(stack_chunk_num_stripes, struct btrfs_chunk,
1310 BTRFS_SETGET_STACK_FUNCS(stack_chunk_sub_stripes, struct btrfs_chunk,
1312 BTRFS_SETGET_STACK_FUNCS(stack_stripe_devid, struct btrfs_stripe, devid, 64);
1313 BTRFS_SETGET_STACK_FUNCS(stack_stripe_offset, struct btrfs_stripe, offset, 64);
1315 static inline struct btrfs_stripe *btrfs_stripe_nr(struct btrfs_chunk *c,
1318 unsigned long offset = (unsigned long)c;
1319 offset += offsetof(struct btrfs_chunk, stripe);
1320 offset += nr * sizeof(struct btrfs_stripe);
1321 return (struct btrfs_stripe *)offset;
1324 static inline char *btrfs_stripe_dev_uuid_nr(struct btrfs_chunk *c, int nr)
1326 return btrfs_stripe_dev_uuid(btrfs_stripe_nr(c, nr));
1329 static inline u64 btrfs_stripe_offset_nr(struct extent_buffer *eb,
1330 struct btrfs_chunk *c, int nr)
1332 return btrfs_stripe_offset(eb, btrfs_stripe_nr(c, nr));
1335 static inline void btrfs_set_stripe_offset_nr(struct extent_buffer *eb,
1336 struct btrfs_chunk *c, int nr,
1339 btrfs_set_stripe_offset(eb, btrfs_stripe_nr(c, nr), val);
1342 static inline u64 btrfs_stripe_devid_nr(struct extent_buffer *eb,
1343 struct btrfs_chunk *c, int nr)
1345 return btrfs_stripe_devid(eb, btrfs_stripe_nr(c, nr));
1348 static inline void btrfs_set_stripe_devid_nr(struct extent_buffer *eb,
1349 struct btrfs_chunk *c, int nr,
1352 btrfs_set_stripe_devid(eb, btrfs_stripe_nr(c, nr), val);
1355 /* struct btrfs_block_group_item */
1356 BTRFS_SETGET_STACK_FUNCS(block_group_used, struct btrfs_block_group_item,
1358 BTRFS_SETGET_FUNCS(disk_block_group_used, struct btrfs_block_group_item,
1360 BTRFS_SETGET_STACK_FUNCS(block_group_chunk_objectid,
1361 struct btrfs_block_group_item, chunk_objectid, 64);
1363 BTRFS_SETGET_FUNCS(disk_block_group_chunk_objectid,
1364 struct btrfs_block_group_item, chunk_objectid, 64);
1365 BTRFS_SETGET_FUNCS(disk_block_group_flags,
1366 struct btrfs_block_group_item, flags, 64);
1367 BTRFS_SETGET_STACK_FUNCS(block_group_flags,
1368 struct btrfs_block_group_item, flags, 64);
1370 /* struct btrfs_inode_ref */
1371 BTRFS_SETGET_FUNCS(inode_ref_name_len, struct btrfs_inode_ref, name_len, 16);
1372 BTRFS_SETGET_FUNCS(inode_ref_index, struct btrfs_inode_ref, index, 64);
1374 /* struct btrfs_inode_item */
1375 BTRFS_SETGET_FUNCS(inode_generation, struct btrfs_inode_item, generation, 64);
1376 BTRFS_SETGET_FUNCS(inode_sequence, struct btrfs_inode_item, sequence, 64);
1377 BTRFS_SETGET_FUNCS(inode_transid, struct btrfs_inode_item, transid, 64);
1378 BTRFS_SETGET_FUNCS(inode_size, struct btrfs_inode_item, size, 64);
1379 BTRFS_SETGET_FUNCS(inode_nbytes, struct btrfs_inode_item, nbytes, 64);
1380 BTRFS_SETGET_FUNCS(inode_block_group, struct btrfs_inode_item, block_group, 64);
1381 BTRFS_SETGET_FUNCS(inode_nlink, struct btrfs_inode_item, nlink, 32);
1382 BTRFS_SETGET_FUNCS(inode_uid, struct btrfs_inode_item, uid, 32);
1383 BTRFS_SETGET_FUNCS(inode_gid, struct btrfs_inode_item, gid, 32);
1384 BTRFS_SETGET_FUNCS(inode_mode, struct btrfs_inode_item, mode, 32);
1385 BTRFS_SETGET_FUNCS(inode_rdev, struct btrfs_inode_item, rdev, 64);
1386 BTRFS_SETGET_FUNCS(inode_flags, struct btrfs_inode_item, flags, 64);
1388 static inline struct btrfs_timespec *
1389 btrfs_inode_atime(struct btrfs_inode_item *inode_item)
1391 unsigned long ptr = (unsigned long)inode_item;
1392 ptr += offsetof(struct btrfs_inode_item, atime);
1393 return (struct btrfs_timespec *)ptr;
1396 static inline struct btrfs_timespec *
1397 btrfs_inode_mtime(struct btrfs_inode_item *inode_item)
1399 unsigned long ptr = (unsigned long)inode_item;
1400 ptr += offsetof(struct btrfs_inode_item, mtime);
1401 return (struct btrfs_timespec *)ptr;
1404 static inline struct btrfs_timespec *
1405 btrfs_inode_ctime(struct btrfs_inode_item *inode_item)
1407 unsigned long ptr = (unsigned long)inode_item;
1408 ptr += offsetof(struct btrfs_inode_item, ctime);
1409 return (struct btrfs_timespec *)ptr;
1412 static inline struct btrfs_timespec *
1413 btrfs_inode_otime(struct btrfs_inode_item *inode_item)
1415 unsigned long ptr = (unsigned long)inode_item;
1416 ptr += offsetof(struct btrfs_inode_item, otime);
1417 return (struct btrfs_timespec *)ptr;
1420 BTRFS_SETGET_FUNCS(timespec_sec, struct btrfs_timespec, sec, 64);
1421 BTRFS_SETGET_FUNCS(timespec_nsec, struct btrfs_timespec, nsec, 32);
1423 /* struct btrfs_dev_extent */
1424 BTRFS_SETGET_FUNCS(dev_extent_chunk_tree, struct btrfs_dev_extent,
1426 BTRFS_SETGET_FUNCS(dev_extent_chunk_objectid, struct btrfs_dev_extent,
1427 chunk_objectid, 64);
1428 BTRFS_SETGET_FUNCS(dev_extent_chunk_offset, struct btrfs_dev_extent,
1430 BTRFS_SETGET_FUNCS(dev_extent_length, struct btrfs_dev_extent, length, 64);
1432 static inline u8 *btrfs_dev_extent_chunk_tree_uuid(struct btrfs_dev_extent *dev)
1434 unsigned long ptr = offsetof(struct btrfs_dev_extent, chunk_tree_uuid);
1435 return (u8 *)((unsigned long)dev + ptr);
1438 BTRFS_SETGET_FUNCS(extent_refs, struct btrfs_extent_item, refs, 64);
1439 BTRFS_SETGET_FUNCS(extent_generation, struct btrfs_extent_item,
1441 BTRFS_SETGET_FUNCS(extent_flags, struct btrfs_extent_item, flags, 64);
1443 BTRFS_SETGET_FUNCS(extent_refs_v0, struct btrfs_extent_item_v0, refs, 32);
1446 BTRFS_SETGET_FUNCS(tree_block_level, struct btrfs_tree_block_info, level, 8);
1448 static inline void btrfs_tree_block_key(struct extent_buffer *eb,
1449 struct btrfs_tree_block_info *item,
1450 struct btrfs_disk_key *key)
1452 read_eb_member(eb, item, struct btrfs_tree_block_info, key, key);
1455 static inline void btrfs_set_tree_block_key(struct extent_buffer *eb,
1456 struct btrfs_tree_block_info *item,
1457 struct btrfs_disk_key *key)
1459 write_eb_member(eb, item, struct btrfs_tree_block_info, key, key);
1462 BTRFS_SETGET_FUNCS(extent_data_ref_root, struct btrfs_extent_data_ref,
1464 BTRFS_SETGET_FUNCS(extent_data_ref_objectid, struct btrfs_extent_data_ref,
1466 BTRFS_SETGET_FUNCS(extent_data_ref_offset, struct btrfs_extent_data_ref,
1468 BTRFS_SETGET_FUNCS(extent_data_ref_count, struct btrfs_extent_data_ref,
1471 BTRFS_SETGET_FUNCS(shared_data_ref_count, struct btrfs_shared_data_ref,
1474 BTRFS_SETGET_FUNCS(extent_inline_ref_type, struct btrfs_extent_inline_ref,
1476 BTRFS_SETGET_FUNCS(extent_inline_ref_offset, struct btrfs_extent_inline_ref,
1479 static inline u32 btrfs_extent_inline_ref_size(int type)
1481 if (type == BTRFS_TREE_BLOCK_REF_KEY ||
1482 type == BTRFS_SHARED_BLOCK_REF_KEY)
1483 return sizeof(struct btrfs_extent_inline_ref);
1484 if (type == BTRFS_SHARED_DATA_REF_KEY)
1485 return sizeof(struct btrfs_shared_data_ref) +
1486 sizeof(struct btrfs_extent_inline_ref);
1487 if (type == BTRFS_EXTENT_DATA_REF_KEY)
1488 return sizeof(struct btrfs_extent_data_ref) +
1489 offsetof(struct btrfs_extent_inline_ref, offset);
1494 BTRFS_SETGET_FUNCS(ref_root_v0, struct btrfs_extent_ref_v0, root, 64);
1495 BTRFS_SETGET_FUNCS(ref_generation_v0, struct btrfs_extent_ref_v0,
1497 BTRFS_SETGET_FUNCS(ref_objectid_v0, struct btrfs_extent_ref_v0, objectid, 64);
1498 BTRFS_SETGET_FUNCS(ref_count_v0, struct btrfs_extent_ref_v0, count, 32);
1500 /* struct btrfs_node */
1501 BTRFS_SETGET_FUNCS(key_blockptr, struct btrfs_key_ptr, blockptr, 64);
1502 BTRFS_SETGET_FUNCS(key_generation, struct btrfs_key_ptr, generation, 64);
1504 static inline u64 btrfs_node_blockptr(struct extent_buffer *eb, int nr)
1507 ptr = offsetof(struct btrfs_node, ptrs) +
1508 sizeof(struct btrfs_key_ptr) * nr;
1509 return btrfs_key_blockptr(eb, (struct btrfs_key_ptr *)ptr);
1512 static inline void btrfs_set_node_blockptr(struct extent_buffer *eb,
1516 ptr = offsetof(struct btrfs_node, ptrs) +
1517 sizeof(struct btrfs_key_ptr) * nr;
1518 btrfs_set_key_blockptr(eb, (struct btrfs_key_ptr *)ptr, val);
1521 static inline u64 btrfs_node_ptr_generation(struct extent_buffer *eb, int nr)
1524 ptr = offsetof(struct btrfs_node, ptrs) +
1525 sizeof(struct btrfs_key_ptr) * nr;
1526 return btrfs_key_generation(eb, (struct btrfs_key_ptr *)ptr);
1529 static inline void btrfs_set_node_ptr_generation(struct extent_buffer *eb,
1533 ptr = offsetof(struct btrfs_node, ptrs) +
1534 sizeof(struct btrfs_key_ptr) * nr;
1535 btrfs_set_key_generation(eb, (struct btrfs_key_ptr *)ptr, val);
1538 static inline unsigned long btrfs_node_key_ptr_offset(int nr)
1540 return offsetof(struct btrfs_node, ptrs) +
1541 sizeof(struct btrfs_key_ptr) * nr;
1544 void btrfs_node_key(struct extent_buffer *eb,
1545 struct btrfs_disk_key *disk_key, int nr);
1547 static inline void btrfs_set_node_key(struct extent_buffer *eb,
1548 struct btrfs_disk_key *disk_key, int nr)
1551 ptr = btrfs_node_key_ptr_offset(nr);
1552 write_eb_member(eb, (struct btrfs_key_ptr *)ptr,
1553 struct btrfs_key_ptr, key, disk_key);
1556 /* struct btrfs_item */
1557 BTRFS_SETGET_FUNCS(item_offset, struct btrfs_item, offset, 32);
1558 BTRFS_SETGET_FUNCS(item_size, struct btrfs_item, size, 32);
1560 static inline unsigned long btrfs_item_nr_offset(int nr)
1562 return offsetof(struct btrfs_leaf, items) +
1563 sizeof(struct btrfs_item) * nr;
1566 static inline struct btrfs_item *btrfs_item_nr(struct extent_buffer *eb,
1569 return (struct btrfs_item *)btrfs_item_nr_offset(nr);
1572 static inline u32 btrfs_item_end(struct extent_buffer *eb,
1573 struct btrfs_item *item)
1575 return btrfs_item_offset(eb, item) + btrfs_item_size(eb, item);
1578 static inline u32 btrfs_item_end_nr(struct extent_buffer *eb, int nr)
1580 return btrfs_item_end(eb, btrfs_item_nr(eb, nr));
1583 static inline u32 btrfs_item_offset_nr(struct extent_buffer *eb, int nr)
1585 return btrfs_item_offset(eb, btrfs_item_nr(eb, nr));
1588 static inline u32 btrfs_item_size_nr(struct extent_buffer *eb, int nr)
1590 return btrfs_item_size(eb, btrfs_item_nr(eb, nr));
1593 static inline void btrfs_item_key(struct extent_buffer *eb,
1594 struct btrfs_disk_key *disk_key, int nr)
1596 struct btrfs_item *item = btrfs_item_nr(eb, nr);
1597 read_eb_member(eb, item, struct btrfs_item, key, disk_key);
1600 static inline void btrfs_set_item_key(struct extent_buffer *eb,
1601 struct btrfs_disk_key *disk_key, int nr)
1603 struct btrfs_item *item = btrfs_item_nr(eb, nr);
1604 write_eb_member(eb, item, struct btrfs_item, key, disk_key);
1607 BTRFS_SETGET_FUNCS(dir_log_end, struct btrfs_dir_log_item, end, 64);
1610 * struct btrfs_root_ref
1612 BTRFS_SETGET_FUNCS(root_ref_dirid, struct btrfs_root_ref, dirid, 64);
1613 BTRFS_SETGET_FUNCS(root_ref_sequence, struct btrfs_root_ref, sequence, 64);
1614 BTRFS_SETGET_FUNCS(root_ref_name_len, struct btrfs_root_ref, name_len, 16);
1616 /* struct btrfs_dir_item */
1617 BTRFS_SETGET_FUNCS(dir_data_len, struct btrfs_dir_item, data_len, 16);
1618 BTRFS_SETGET_FUNCS(dir_type, struct btrfs_dir_item, type, 8);
1619 BTRFS_SETGET_FUNCS(dir_name_len, struct btrfs_dir_item, name_len, 16);
1620 BTRFS_SETGET_FUNCS(dir_transid, struct btrfs_dir_item, transid, 64);
1622 static inline void btrfs_dir_item_key(struct extent_buffer *eb,
1623 struct btrfs_dir_item *item,
1624 struct btrfs_disk_key *key)
1626 read_eb_member(eb, item, struct btrfs_dir_item, location, key);
1629 static inline void btrfs_set_dir_item_key(struct extent_buffer *eb,
1630 struct btrfs_dir_item *item,
1631 struct btrfs_disk_key *key)
1633 write_eb_member(eb, item, struct btrfs_dir_item, location, key);
1636 /* struct btrfs_disk_key */
1637 BTRFS_SETGET_STACK_FUNCS(disk_key_objectid, struct btrfs_disk_key,
1639 BTRFS_SETGET_STACK_FUNCS(disk_key_offset, struct btrfs_disk_key, offset, 64);
1640 BTRFS_SETGET_STACK_FUNCS(disk_key_type, struct btrfs_disk_key, type, 8);
1642 static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu,
1643 struct btrfs_disk_key *disk)
1645 cpu->offset = le64_to_cpu(disk->offset);
1646 cpu->type = disk->type;
1647 cpu->objectid = le64_to_cpu(disk->objectid);
1650 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk,
1651 struct btrfs_key *cpu)
1653 disk->offset = cpu_to_le64(cpu->offset);
1654 disk->type = cpu->type;
1655 disk->objectid = cpu_to_le64(cpu->objectid);
1658 static inline void btrfs_node_key_to_cpu(struct extent_buffer *eb,
1659 struct btrfs_key *key, int nr)
1661 struct btrfs_disk_key disk_key;
1662 btrfs_node_key(eb, &disk_key, nr);
1663 btrfs_disk_key_to_cpu(key, &disk_key);
1666 static inline void btrfs_item_key_to_cpu(struct extent_buffer *eb,
1667 struct btrfs_key *key, int nr)
1669 struct btrfs_disk_key disk_key;
1670 btrfs_item_key(eb, &disk_key, nr);
1671 btrfs_disk_key_to_cpu(key, &disk_key);
1674 static inline void btrfs_dir_item_key_to_cpu(struct extent_buffer *eb,
1675 struct btrfs_dir_item *item,
1676 struct btrfs_key *key)
1678 struct btrfs_disk_key disk_key;
1679 btrfs_dir_item_key(eb, item, &disk_key);
1680 btrfs_disk_key_to_cpu(key, &disk_key);
1684 static inline u8 btrfs_key_type(struct btrfs_key *key)
1689 static inline void btrfs_set_key_type(struct btrfs_key *key, u8 val)
1694 /* struct btrfs_header */
1695 BTRFS_SETGET_HEADER_FUNCS(header_bytenr, struct btrfs_header, bytenr, 64);
1696 BTRFS_SETGET_HEADER_FUNCS(header_generation, struct btrfs_header,
1698 BTRFS_SETGET_HEADER_FUNCS(header_owner, struct btrfs_header, owner, 64);
1699 BTRFS_SETGET_HEADER_FUNCS(header_nritems, struct btrfs_header, nritems, 32);
1700 BTRFS_SETGET_HEADER_FUNCS(header_flags, struct btrfs_header, flags, 64);
1701 BTRFS_SETGET_HEADER_FUNCS(header_level, struct btrfs_header, level, 8);
1703 static inline int btrfs_header_flag(struct extent_buffer *eb, u64 flag)
1705 return (btrfs_header_flags(eb) & flag) == flag;
1708 static inline int btrfs_set_header_flag(struct extent_buffer *eb, u64 flag)
1710 u64 flags = btrfs_header_flags(eb);
1711 btrfs_set_header_flags(eb, flags | flag);
1712 return (flags & flag) == flag;
1715 static inline int btrfs_clear_header_flag(struct extent_buffer *eb, u64 flag)
1717 u64 flags = btrfs_header_flags(eb);
1718 btrfs_set_header_flags(eb, flags & ~flag);
1719 return (flags & flag) == flag;
1722 static inline int btrfs_header_backref_rev(struct extent_buffer *eb)
1724 u64 flags = btrfs_header_flags(eb);
1725 return flags >> BTRFS_BACKREF_REV_SHIFT;
1728 static inline void btrfs_set_header_backref_rev(struct extent_buffer *eb,
1731 u64 flags = btrfs_header_flags(eb);
1732 flags &= ~BTRFS_BACKREF_REV_MASK;
1733 flags |= (u64)rev << BTRFS_BACKREF_REV_SHIFT;
1734 btrfs_set_header_flags(eb, flags);
1737 static inline u8 *btrfs_header_fsid(struct extent_buffer *eb)
1739 unsigned long ptr = offsetof(struct btrfs_header, fsid);
1743 static inline u8 *btrfs_header_chunk_tree_uuid(struct extent_buffer *eb)
1745 unsigned long ptr = offsetof(struct btrfs_header, chunk_tree_uuid);
1749 static inline u8 *btrfs_super_fsid(struct extent_buffer *eb)
1751 unsigned long ptr = offsetof(struct btrfs_super_block, fsid);
1755 static inline u8 *btrfs_header_csum(struct extent_buffer *eb)
1757 unsigned long ptr = offsetof(struct btrfs_header, csum);
1761 static inline struct btrfs_node *btrfs_buffer_node(struct extent_buffer *eb)
1766 static inline struct btrfs_leaf *btrfs_buffer_leaf(struct extent_buffer *eb)
1771 static inline struct btrfs_header *btrfs_buffer_header(struct extent_buffer *eb)
1776 static inline int btrfs_is_leaf(struct extent_buffer *eb)
1778 return btrfs_header_level(eb) == 0;
1781 /* struct btrfs_root_item */
1782 BTRFS_SETGET_FUNCS(disk_root_generation, struct btrfs_root_item,
1784 BTRFS_SETGET_FUNCS(disk_root_refs, struct btrfs_root_item, refs, 32);
1785 BTRFS_SETGET_FUNCS(disk_root_bytenr, struct btrfs_root_item, bytenr, 64);
1786 BTRFS_SETGET_FUNCS(disk_root_level, struct btrfs_root_item, level, 8);
1788 BTRFS_SETGET_STACK_FUNCS(root_generation, struct btrfs_root_item,
1790 BTRFS_SETGET_STACK_FUNCS(root_bytenr, struct btrfs_root_item, bytenr, 64);
1791 BTRFS_SETGET_STACK_FUNCS(root_level, struct btrfs_root_item, level, 8);
1792 BTRFS_SETGET_STACK_FUNCS(root_dirid, struct btrfs_root_item, root_dirid, 64);
1793 BTRFS_SETGET_STACK_FUNCS(root_refs, struct btrfs_root_item, refs, 32);
1794 BTRFS_SETGET_STACK_FUNCS(root_flags, struct btrfs_root_item, flags, 64);
1795 BTRFS_SETGET_STACK_FUNCS(root_used, struct btrfs_root_item, bytes_used, 64);
1796 BTRFS_SETGET_STACK_FUNCS(root_limit, struct btrfs_root_item, byte_limit, 64);
1797 BTRFS_SETGET_STACK_FUNCS(root_last_snapshot, struct btrfs_root_item,
1800 /* struct btrfs_super_block */
1802 BTRFS_SETGET_STACK_FUNCS(super_bytenr, struct btrfs_super_block, bytenr, 64);
1803 BTRFS_SETGET_STACK_FUNCS(super_flags, struct btrfs_super_block, flags, 64);
1804 BTRFS_SETGET_STACK_FUNCS(super_generation, struct btrfs_super_block,
1806 BTRFS_SETGET_STACK_FUNCS(super_root, struct btrfs_super_block, root, 64);
1807 BTRFS_SETGET_STACK_FUNCS(super_sys_array_size,
1808 struct btrfs_super_block, sys_chunk_array_size, 32);
1809 BTRFS_SETGET_STACK_FUNCS(super_chunk_root_generation,
1810 struct btrfs_super_block, chunk_root_generation, 64);
1811 BTRFS_SETGET_STACK_FUNCS(super_root_level, struct btrfs_super_block,
1813 BTRFS_SETGET_STACK_FUNCS(super_chunk_root, struct btrfs_super_block,
1815 BTRFS_SETGET_STACK_FUNCS(super_chunk_root_level, struct btrfs_super_block,
1816 chunk_root_level, 8);
1817 BTRFS_SETGET_STACK_FUNCS(super_log_root, struct btrfs_super_block,
1819 BTRFS_SETGET_STACK_FUNCS(super_log_root_transid, struct btrfs_super_block,
1820 log_root_transid, 64);
1821 BTRFS_SETGET_STACK_FUNCS(super_log_root_level, struct btrfs_super_block,
1823 BTRFS_SETGET_STACK_FUNCS(super_total_bytes, struct btrfs_super_block,
1825 BTRFS_SETGET_STACK_FUNCS(super_bytes_used, struct btrfs_super_block,
1827 BTRFS_SETGET_STACK_FUNCS(super_sectorsize, struct btrfs_super_block,
1829 BTRFS_SETGET_STACK_FUNCS(super_nodesize, struct btrfs_super_block,
1831 BTRFS_SETGET_STACK_FUNCS(super_leafsize, struct btrfs_super_block,
1833 BTRFS_SETGET_STACK_FUNCS(super_stripesize, struct btrfs_super_block,
1835 BTRFS_SETGET_STACK_FUNCS(super_root_dir, struct btrfs_super_block,
1836 root_dir_objectid, 64);
1837 BTRFS_SETGET_STACK_FUNCS(super_num_devices, struct btrfs_super_block,
1839 BTRFS_SETGET_STACK_FUNCS(super_compat_flags, struct btrfs_super_block,
1841 BTRFS_SETGET_STACK_FUNCS(super_compat_ro_flags, struct btrfs_super_block,
1842 compat_ro_flags, 64);
1843 BTRFS_SETGET_STACK_FUNCS(super_incompat_flags, struct btrfs_super_block,
1844 incompat_flags, 64);
1845 BTRFS_SETGET_STACK_FUNCS(super_csum_type, struct btrfs_super_block,
1848 static inline int btrfs_super_csum_size(struct btrfs_super_block *s)
1850 int t = btrfs_super_csum_type(s);
1851 BUG_ON(t >= ARRAY_SIZE(btrfs_csum_sizes));
1852 return btrfs_csum_sizes[t];
1855 static inline unsigned long btrfs_leaf_data(struct extent_buffer *l)
1857 return offsetof(struct btrfs_leaf, items);
1860 /* struct btrfs_file_extent_item */
1861 BTRFS_SETGET_FUNCS(file_extent_type, struct btrfs_file_extent_item, type, 8);
1863 static inline unsigned long
1864 btrfs_file_extent_inline_start(struct btrfs_file_extent_item *e)
1866 unsigned long offset = (unsigned long)e;
1867 offset += offsetof(struct btrfs_file_extent_item, disk_bytenr);
1871 static inline u32 btrfs_file_extent_calc_inline_size(u32 datasize)
1873 return offsetof(struct btrfs_file_extent_item, disk_bytenr) + datasize;
1876 BTRFS_SETGET_FUNCS(file_extent_disk_bytenr, struct btrfs_file_extent_item,
1878 BTRFS_SETGET_FUNCS(file_extent_generation, struct btrfs_file_extent_item,
1880 BTRFS_SETGET_FUNCS(file_extent_disk_num_bytes, struct btrfs_file_extent_item,
1881 disk_num_bytes, 64);
1882 BTRFS_SETGET_FUNCS(file_extent_offset, struct btrfs_file_extent_item,
1884 BTRFS_SETGET_FUNCS(file_extent_num_bytes, struct btrfs_file_extent_item,
1886 BTRFS_SETGET_FUNCS(file_extent_ram_bytes, struct btrfs_file_extent_item,
1888 BTRFS_SETGET_FUNCS(file_extent_compression, struct btrfs_file_extent_item,
1890 BTRFS_SETGET_FUNCS(file_extent_encryption, struct btrfs_file_extent_item,
1892 BTRFS_SETGET_FUNCS(file_extent_other_encoding, struct btrfs_file_extent_item,
1893 other_encoding, 16);
1895 /* this returns the number of file bytes represented by the inline item.
1896 * If an item is compressed, this is the uncompressed size
1898 static inline u32 btrfs_file_extent_inline_len(struct extent_buffer *eb,
1899 struct btrfs_file_extent_item *e)
1901 return btrfs_file_extent_ram_bytes(eb, e);
1905 * this returns the number of bytes used by the item on disk, minus the
1906 * size of any extent headers. If a file is compressed on disk, this is
1907 * the compressed size
1909 static inline u32 btrfs_file_extent_inline_item_len(struct extent_buffer *eb,
1910 struct btrfs_item *e)
1912 unsigned long offset;
1913 offset = offsetof(struct btrfs_file_extent_item, disk_bytenr);
1914 return btrfs_item_size(eb, e) - offset;
1917 static inline struct btrfs_root *btrfs_sb(struct super_block *sb)
1919 return sb->s_fs_info;
1922 static inline int btrfs_set_root_name(struct btrfs_root *root,
1923 const char *name, int len)
1925 /* if we already have a name just free it */
1928 root->name = kmalloc(len+1, GFP_KERNEL);
1932 memcpy(root->name, name, len);
1933 root->name[len] = '\0';
1938 static inline u32 btrfs_level_size(struct btrfs_root *root, int level)
1941 return root->leafsize;
1942 return root->nodesize;
1945 /* helper function to cast into the data area of the leaf. */
1946 #define btrfs_item_ptr(leaf, slot, type) \
1947 ((type *)(btrfs_leaf_data(leaf) + \
1948 btrfs_item_offset_nr(leaf, slot)))
1950 #define btrfs_item_ptr_offset(leaf, slot) \
1951 ((unsigned long)(btrfs_leaf_data(leaf) + \
1952 btrfs_item_offset_nr(leaf, slot)))
1954 static inline struct dentry *fdentry(struct file *file)
1956 return file->f_path.dentry;
1960 void btrfs_put_block_group(struct btrfs_block_group_cache *cache);
1961 int btrfs_run_delayed_refs(struct btrfs_trans_handle *trans,
1962 struct btrfs_root *root, unsigned long count);
1963 int btrfs_lookup_extent(struct btrfs_root *root, u64 start, u64 len);
1964 int btrfs_pin_extent(struct btrfs_root *root,
1965 u64 bytenr, u64 num, int reserved);
1966 int btrfs_drop_leaf_ref(struct btrfs_trans_handle *trans,
1967 struct btrfs_root *root, struct extent_buffer *leaf);
1968 int btrfs_cross_ref_exist(struct btrfs_trans_handle *trans,
1969 struct btrfs_root *root,
1970 u64 objectid, u64 offset, u64 bytenr);
1971 int btrfs_copy_pinned(struct btrfs_root *root, struct extent_io_tree *copy);
1972 struct btrfs_block_group_cache *btrfs_lookup_block_group(
1973 struct btrfs_fs_info *info,
1975 void btrfs_put_block_group(struct btrfs_block_group_cache *cache);
1976 u64 btrfs_find_block_group(struct btrfs_root *root,
1977 u64 search_start, u64 search_hint, int owner);
1978 struct extent_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
1979 struct btrfs_root *root, u32 blocksize,
1980 u64 parent, u64 root_objectid,
1981 struct btrfs_disk_key *key, int level,
1982 u64 hint, u64 empty_size);
1983 int btrfs_free_tree_block(struct btrfs_trans_handle *trans,
1984 struct btrfs_root *root,
1985 u64 bytenr, u32 blocksize,
1986 u64 parent, u64 root_objectid, int level);
1987 struct extent_buffer *btrfs_init_new_buffer(struct btrfs_trans_handle *trans,
1988 struct btrfs_root *root,
1989 u64 bytenr, u32 blocksize,
1991 int btrfs_alloc_reserved_file_extent(struct btrfs_trans_handle *trans,
1992 struct btrfs_root *root,
1993 u64 root_objectid, u64 owner,
1994 u64 offset, struct btrfs_key *ins);
1995 int btrfs_alloc_logged_file_extent(struct btrfs_trans_handle *trans,
1996 struct btrfs_root *root,
1997 u64 root_objectid, u64 owner, u64 offset,
1998 struct btrfs_key *ins);
1999 int btrfs_reserve_extent(struct btrfs_trans_handle *trans,
2000 struct btrfs_root *root,
2001 u64 num_bytes, u64 min_alloc_size,
2002 u64 empty_size, u64 hint_byte,
2003 u64 search_end, struct btrfs_key *ins,
2005 int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2006 struct extent_buffer *buf, int full_backref);
2007 int btrfs_dec_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2008 struct extent_buffer *buf, int full_backref);
2009 int btrfs_set_disk_extent_flags(struct btrfs_trans_handle *trans,
2010 struct btrfs_root *root,
2011 u64 bytenr, u64 num_bytes, u64 flags,
2013 int btrfs_free_extent(struct btrfs_trans_handle *trans,
2014 struct btrfs_root *root,
2015 u64 bytenr, u64 num_bytes, u64 parent,
2016 u64 root_objectid, u64 owner, u64 offset);
2018 int btrfs_free_reserved_extent(struct btrfs_root *root, u64 start, u64 len);
2019 int btrfs_prepare_extent_commit(struct btrfs_trans_handle *trans,
2020 struct btrfs_root *root);
2021 int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans,
2022 struct btrfs_root *root);
2023 int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
2024 struct btrfs_root *root,
2025 u64 bytenr, u64 num_bytes, u64 parent,
2026 u64 root_objectid, u64 owner, u64 offset);
2028 int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans,
2029 struct btrfs_root *root);
2030 int btrfs_extent_readonly(struct btrfs_root *root, u64 bytenr);
2031 int btrfs_free_block_groups(struct btrfs_fs_info *info);
2032 int btrfs_read_block_groups(struct btrfs_root *root);
2033 int btrfs_can_relocate(struct btrfs_root *root, u64 bytenr);
2034 int btrfs_make_block_group(struct btrfs_trans_handle *trans,
2035 struct btrfs_root *root, u64 bytes_used,
2036 u64 type, u64 chunk_objectid, u64 chunk_offset,
2038 int btrfs_remove_block_group(struct btrfs_trans_handle *trans,
2039 struct btrfs_root *root, u64 group_start);
2040 int btrfs_prepare_block_group_relocation(struct btrfs_root *root,
2041 struct btrfs_block_group_cache *group);
2043 u64 btrfs_reduce_alloc_profile(struct btrfs_root *root, u64 flags);
2044 void btrfs_set_inode_space_info(struct btrfs_root *root, struct inode *ionde);
2045 void btrfs_clear_space_info_full(struct btrfs_fs_info *info);
2047 int btrfs_reserve_metadata_space(struct btrfs_root *root, int num_items);
2048 int btrfs_unreserve_metadata_space(struct btrfs_root *root, int num_items);
2049 int btrfs_unreserve_metadata_for_delalloc(struct btrfs_root *root,
2050 struct inode *inode, int num_items);
2051 int btrfs_reserve_metadata_for_delalloc(struct btrfs_root *root,
2052 struct inode *inode, int num_items);
2053 int btrfs_check_data_free_space(struct btrfs_root *root, struct inode *inode,
2055 void btrfs_free_reserved_data_space(struct btrfs_root *root,
2056 struct inode *inode, u64 bytes);
2057 void btrfs_delalloc_reserve_space(struct btrfs_root *root, struct inode *inode,
2059 void btrfs_delalloc_free_space(struct btrfs_root *root, struct inode *inode,
2062 int btrfs_bin_search(struct extent_buffer *eb, struct btrfs_key *key,
2063 int level, int *slot);
2064 int btrfs_comp_cpu_keys(struct btrfs_key *k1, struct btrfs_key *k2);
2065 int btrfs_previous_item(struct btrfs_root *root,
2066 struct btrfs_path *path, u64 min_objectid,
2068 int btrfs_set_item_key_safe(struct btrfs_trans_handle *trans,
2069 struct btrfs_root *root, struct btrfs_path *path,
2070 struct btrfs_key *new_key);
2071 struct extent_buffer *btrfs_root_node(struct btrfs_root *root);
2072 struct extent_buffer *btrfs_lock_root_node(struct btrfs_root *root);
2073 int btrfs_find_next_key(struct btrfs_root *root, struct btrfs_path *path,
2074 struct btrfs_key *key, int lowest_level,
2075 int cache_only, u64 min_trans);
2076 int btrfs_search_forward(struct btrfs_root *root, struct btrfs_key *min_key,
2077 struct btrfs_key *max_key,
2078 struct btrfs_path *path, int cache_only,
2080 int btrfs_cow_block(struct btrfs_trans_handle *trans,
2081 struct btrfs_root *root, struct extent_buffer *buf,
2082 struct extent_buffer *parent, int parent_slot,
2083 struct extent_buffer **cow_ret);
2084 int btrfs_copy_root(struct btrfs_trans_handle *trans,
2085 struct btrfs_root *root,
2086 struct extent_buffer *buf,
2087 struct extent_buffer **cow_ret, u64 new_root_objectid);
2088 int btrfs_block_can_be_shared(struct btrfs_root *root,
2089 struct extent_buffer *buf);
2090 int btrfs_extend_item(struct btrfs_trans_handle *trans, struct btrfs_root
2091 *root, struct btrfs_path *path, u32 data_size);
2092 int btrfs_truncate_item(struct btrfs_trans_handle *trans,
2093 struct btrfs_root *root,
2094 struct btrfs_path *path,
2095 u32 new_size, int from_end);
2096 int btrfs_split_item(struct btrfs_trans_handle *trans,
2097 struct btrfs_root *root,
2098 struct btrfs_path *path,
2099 struct btrfs_key *new_key,
2100 unsigned long split_offset);
2101 int btrfs_duplicate_item(struct btrfs_trans_handle *trans,
2102 struct btrfs_root *root,
2103 struct btrfs_path *path,
2104 struct btrfs_key *new_key);
2105 int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root
2106 *root, struct btrfs_key *key, struct btrfs_path *p, int
2108 int btrfs_realloc_node(struct btrfs_trans_handle *trans,
2109 struct btrfs_root *root, struct extent_buffer *parent,
2110 int start_slot, int cache_only, u64 *last_ret,
2111 struct btrfs_key *progress);
2112 void btrfs_release_path(struct btrfs_root *root, struct btrfs_path *p);
2113 struct btrfs_path *btrfs_alloc_path(void);
2114 void btrfs_free_path(struct btrfs_path *p);
2115 void btrfs_set_path_blocking(struct btrfs_path *p);
2116 void btrfs_unlock_up_safe(struct btrfs_path *p, int level);
2118 int btrfs_del_items(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2119 struct btrfs_path *path, int slot, int nr);
2120 static inline int btrfs_del_item(struct btrfs_trans_handle *trans,
2121 struct btrfs_root *root,
2122 struct btrfs_path *path)
2124 return btrfs_del_items(trans, root, path, path->slots[0], 1);
2127 int btrfs_insert_item(struct btrfs_trans_handle *trans, struct btrfs_root
2128 *root, struct btrfs_key *key, void *data, u32 data_size);
2129 int btrfs_insert_some_items(struct btrfs_trans_handle *trans,
2130 struct btrfs_root *root,
2131 struct btrfs_path *path,
2132 struct btrfs_key *cpu_key, u32 *data_size,
2134 int btrfs_insert_empty_items(struct btrfs_trans_handle *trans,
2135 struct btrfs_root *root,
2136 struct btrfs_path *path,
2137 struct btrfs_key *cpu_key, u32 *data_size, int nr);
2139 static inline int btrfs_insert_empty_item(struct btrfs_trans_handle *trans,
2140 struct btrfs_root *root,
2141 struct btrfs_path *path,
2142 struct btrfs_key *key,
2145 return btrfs_insert_empty_items(trans, root, path, key, &data_size, 1);
2148 int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path);
2149 int btrfs_prev_leaf(struct btrfs_root *root, struct btrfs_path *path);
2150 int btrfs_leaf_free_space(struct btrfs_root *root, struct extent_buffer *leaf);
2151 int btrfs_drop_snapshot(struct btrfs_root *root, int update_ref);
2152 int btrfs_drop_subtree(struct btrfs_trans_handle *trans,
2153 struct btrfs_root *root,
2154 struct extent_buffer *node,
2155 struct extent_buffer *parent);
2157 int btrfs_find_root_ref(struct btrfs_root *tree_root,
2158 struct btrfs_path *path,
2159 u64 root_id, u64 ref_id);
2160 int btrfs_add_root_ref(struct btrfs_trans_handle *trans,
2161 struct btrfs_root *tree_root,
2162 u64 root_id, u64 ref_id, u64 dirid, u64 sequence,
2163 const char *name, int name_len);
2164 int btrfs_del_root_ref(struct btrfs_trans_handle *trans,
2165 struct btrfs_root *tree_root,
2166 u64 root_id, u64 ref_id, u64 dirid, u64 *sequence,
2167 const char *name, int name_len);
2168 int btrfs_del_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2169 struct btrfs_key *key);
2170 int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root
2171 *root, struct btrfs_key *key, struct btrfs_root_item
2173 int btrfs_update_root(struct btrfs_trans_handle *trans, struct btrfs_root
2174 *root, struct btrfs_key *key, struct btrfs_root_item
2176 int btrfs_find_last_root(struct btrfs_root *root, u64 objectid, struct
2177 btrfs_root_item *item, struct btrfs_key *key);
2178 int btrfs_search_root(struct btrfs_root *root, u64 search_start,
2179 u64 *found_objectid);
2180 int btrfs_find_dead_roots(struct btrfs_root *root, u64 objectid);
2181 int btrfs_find_orphan_roots(struct btrfs_root *tree_root);
2182 int btrfs_set_root_node(struct btrfs_root_item *item,
2183 struct extent_buffer *node);
2185 int btrfs_insert_dir_item(struct btrfs_trans_handle *trans,
2186 struct btrfs_root *root, const char *name,
2187 int name_len, u64 dir,
2188 struct btrfs_key *location, u8 type, u64 index);
2189 struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans,
2190 struct btrfs_root *root,
2191 struct btrfs_path *path, u64 dir,
2192 const char *name, int name_len,
2194 struct btrfs_dir_item *
2195 btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans,
2196 struct btrfs_root *root,
2197 struct btrfs_path *path, u64 dir,
2198 u64 objectid, const char *name, int name_len,
2200 struct btrfs_dir_item *
2201 btrfs_search_dir_index_item(struct btrfs_root *root,
2202 struct btrfs_path *path, u64 dirid,
2203 const char *name, int name_len);
2204 struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_root *root,
2205 struct btrfs_path *path,
2206 const char *name, int name_len);
2207 int btrfs_delete_one_dir_name(struct btrfs_trans_handle *trans,
2208 struct btrfs_root *root,
2209 struct btrfs_path *path,
2210 struct btrfs_dir_item *di);
2211 int btrfs_insert_xattr_item(struct btrfs_trans_handle *trans,
2212 struct btrfs_root *root,
2213 struct btrfs_path *path, u64 objectid,
2214 const char *name, u16 name_len,
2215 const void *data, u16 data_len);
2216 struct btrfs_dir_item *btrfs_lookup_xattr(struct btrfs_trans_handle *trans,
2217 struct btrfs_root *root,
2218 struct btrfs_path *path, u64 dir,
2219 const char *name, u16 name_len,
2223 int btrfs_insert_orphan_item(struct btrfs_trans_handle *trans,
2224 struct btrfs_root *root, u64 offset);
2225 int btrfs_del_orphan_item(struct btrfs_trans_handle *trans,
2226 struct btrfs_root *root, u64 offset);
2227 int btrfs_find_orphan_item(struct btrfs_root *root, u64 offset);
2230 int btrfs_find_free_objectid(struct btrfs_trans_handle *trans,
2231 struct btrfs_root *fs_root,
2232 u64 dirid, u64 *objectid);
2233 int btrfs_find_highest_inode(struct btrfs_root *fs_root, u64 *objectid);
2236 int btrfs_insert_inode_ref(struct btrfs_trans_handle *trans,
2237 struct btrfs_root *root,
2238 const char *name, int name_len,
2239 u64 inode_objectid, u64 ref_objectid, u64 index);
2240 int btrfs_del_inode_ref(struct btrfs_trans_handle *trans,
2241 struct btrfs_root *root,
2242 const char *name, int name_len,
2243 u64 inode_objectid, u64 ref_objectid, u64 *index);
2244 int btrfs_insert_empty_inode(struct btrfs_trans_handle *trans,
2245 struct btrfs_root *root,
2246 struct btrfs_path *path, u64 objectid);
2247 int btrfs_lookup_inode(struct btrfs_trans_handle *trans, struct btrfs_root
2248 *root, struct btrfs_path *path,
2249 struct btrfs_key *location, int mod);
2252 int btrfs_del_csums(struct btrfs_trans_handle *trans,
2253 struct btrfs_root *root, u64 bytenr, u64 len);
2254 int btrfs_lookup_bio_sums(struct btrfs_root *root, struct inode *inode,
2255 struct bio *bio, u32 *dst);
2256 int btrfs_insert_file_extent(struct btrfs_trans_handle *trans,
2257 struct btrfs_root *root,
2258 u64 objectid, u64 pos,
2259 u64 disk_offset, u64 disk_num_bytes,
2260 u64 num_bytes, u64 offset, u64 ram_bytes,
2261 u8 compression, u8 encryption, u16 other_encoding);
2262 int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
2263 struct btrfs_root *root,
2264 struct btrfs_path *path, u64 objectid,
2265 u64 bytenr, int mod);
2266 int btrfs_csum_file_blocks(struct btrfs_trans_handle *trans,
2267 struct btrfs_root *root,
2268 struct btrfs_ordered_sum *sums);
2269 int btrfs_csum_one_bio(struct btrfs_root *root, struct inode *inode,
2270 struct bio *bio, u64 file_start, int contig);
2271 int btrfs_csum_file_bytes(struct btrfs_root *root, struct inode *inode,
2272 u64 start, unsigned long len);
2273 struct btrfs_csum_item *btrfs_lookup_csum(struct btrfs_trans_handle *trans,
2274 struct btrfs_root *root,
2275 struct btrfs_path *path,
2276 u64 bytenr, int cow);
2277 int btrfs_csum_truncate(struct btrfs_trans_handle *trans,
2278 struct btrfs_root *root, struct btrfs_path *path,
2280 int btrfs_lookup_csums_range(struct btrfs_root *root, u64 start,
2281 u64 end, struct list_head *list);
2284 /* RHEL and EL kernels have a patch that renames PG_checked to FsMisc */
2285 #if defined(ClearPageFsMisc) && !defined(ClearPageChecked)
2286 #define ClearPageChecked ClearPageFsMisc
2287 #define SetPageChecked SetPageFsMisc
2288 #define PageChecked PageFsMisc
2291 struct inode *btrfs_lookup_dentry(struct inode *dir, struct dentry *dentry);
2292 int btrfs_set_inode_index(struct inode *dir, u64 *index);
2293 int btrfs_unlink_inode(struct btrfs_trans_handle *trans,
2294 struct btrfs_root *root,
2295 struct inode *dir, struct inode *inode,
2296 const char *name, int name_len);
2297 int btrfs_add_link(struct btrfs_trans_handle *trans,
2298 struct inode *parent_inode, struct inode *inode,
2299 const char *name, int name_len, int add_backref, u64 index);
2300 int btrfs_unlink_subvol(struct btrfs_trans_handle *trans,
2301 struct btrfs_root *root,
2302 struct inode *dir, u64 objectid,
2303 const char *name, int name_len);
2304 int btrfs_truncate_inode_items(struct btrfs_trans_handle *trans,
2305 struct btrfs_root *root,
2306 struct inode *inode, u64 new_size,
2309 int btrfs_start_delalloc_inodes(struct btrfs_root *root, int delay_iput);
2310 int btrfs_start_one_delalloc_inode(struct btrfs_root *root, int delay_iput);
2311 int btrfs_set_extent_delalloc(struct inode *inode, u64 start, u64 end,
2312 struct extent_state **cached_state);
2313 int btrfs_writepages(struct address_space *mapping,
2314 struct writeback_control *wbc);
2315 int btrfs_create_subvol_root(struct btrfs_trans_handle *trans,
2316 struct btrfs_root *new_root,
2317 u64 new_dirid, u64 alloc_hint);
2318 int btrfs_merge_bio_hook(struct page *page, unsigned long offset,
2319 size_t size, struct bio *bio, unsigned long bio_flags);
2321 unsigned long btrfs_force_ra(struct address_space *mapping,
2322 struct file_ra_state *ra, struct file *file,
2323 pgoff_t offset, pgoff_t last_index);
2324 int btrfs_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf);
2325 int btrfs_readpage(struct file *file, struct page *page);
2326 void btrfs_delete_inode(struct inode *inode);
2327 void btrfs_put_inode(struct inode *inode);
2328 int btrfs_write_inode(struct inode *inode, struct writeback_control *wbc);
2329 void btrfs_dirty_inode(struct inode *inode);
2330 struct inode *btrfs_alloc_inode(struct super_block *sb);
2331 void btrfs_destroy_inode(struct inode *inode);
2332 void btrfs_drop_inode(struct inode *inode);
2333 int btrfs_init_cachep(void);
2334 void btrfs_destroy_cachep(void);
2335 long btrfs_ioctl_trans_end(struct file *file);
2336 struct inode *btrfs_iget(struct super_block *s, struct btrfs_key *location,
2337 struct btrfs_root *root, int *was_new);
2338 int btrfs_commit_write(struct file *file, struct page *page,
2339 unsigned from, unsigned to);
2340 struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page,
2341 size_t page_offset, u64 start, u64 end,
2343 int btrfs_update_inode(struct btrfs_trans_handle *trans,
2344 struct btrfs_root *root,
2345 struct inode *inode);
2346 int btrfs_orphan_add(struct btrfs_trans_handle *trans, struct inode *inode);
2347 int btrfs_orphan_del(struct btrfs_trans_handle *trans, struct inode *inode);
2348 void btrfs_orphan_cleanup(struct btrfs_root *root);
2349 int btrfs_cont_expand(struct inode *inode, loff_t size);
2350 int btrfs_invalidate_inodes(struct btrfs_root *root);
2351 void btrfs_add_delayed_iput(struct inode *inode);
2352 void btrfs_run_delayed_iputs(struct btrfs_root *root);
2353 extern const struct dentry_operations btrfs_dentry_operations;
2356 long btrfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
2357 void btrfs_update_iflags(struct inode *inode);
2358 void btrfs_inherit_iflags(struct inode *inode, struct inode *dir);
2361 int btrfs_sync_file(struct file *file, struct dentry *dentry, int datasync);
2362 int btrfs_drop_extent_cache(struct inode *inode, u64 start, u64 end,
2364 int btrfs_check_file(struct btrfs_root *root, struct inode *inode);
2365 extern const struct file_operations btrfs_file_operations;
2366 int btrfs_drop_extents(struct btrfs_trans_handle *trans, struct inode *inode,
2367 u64 start, u64 end, u64 *hint_byte, int drop_cache);
2368 int btrfs_mark_extent_written(struct btrfs_trans_handle *trans,
2369 struct inode *inode, u64 start, u64 end);
2370 int btrfs_release_file(struct inode *inode, struct file *file);
2373 int btrfs_defrag_leaves(struct btrfs_trans_handle *trans,
2374 struct btrfs_root *root, int cache_only);
2377 int btrfs_init_sysfs(void);
2378 void btrfs_exit_sysfs(void);
2379 int btrfs_sysfs_add_super(struct btrfs_fs_info *fs);
2380 int btrfs_sysfs_add_root(struct btrfs_root *root);
2381 void btrfs_sysfs_del_root(struct btrfs_root *root);
2382 void btrfs_sysfs_del_super(struct btrfs_fs_info *root);
2385 ssize_t btrfs_listxattr(struct dentry *dentry, char *buffer, size_t size);
2388 int btrfs_parse_options(struct btrfs_root *root, char *options);
2389 int btrfs_sync_fs(struct super_block *sb, int wait);
2392 #ifdef CONFIG_BTRFS_FS_POSIX_ACL
2393 int btrfs_check_acl(struct inode *inode, int mask);
2395 #define btrfs_check_acl NULL
2397 int btrfs_init_acl(struct btrfs_trans_handle *trans,
2398 struct inode *inode, struct inode *dir);
2399 int btrfs_acl_chmod(struct inode *inode);
2402 int btrfs_relocate_block_group(struct btrfs_root *root, u64 group_start);
2403 int btrfs_init_reloc_root(struct btrfs_trans_handle *trans,
2404 struct btrfs_root *root);
2405 int btrfs_update_reloc_root(struct btrfs_trans_handle *trans,
2406 struct btrfs_root *root);
2407 int btrfs_recover_relocation(struct btrfs_root *root);
2408 int btrfs_reloc_clone_csums(struct inode *inode, u64 file_pos, u64 len);