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 */
677 u64 bytes_super; /* total bytes reserved for the super blocks */
678 u64 bytes_root; /* the number of bytes needed to commit a
680 u64 bytes_may_use; /* number of bytes that may be used for
681 delalloc/allocations */
682 u64 bytes_delalloc; /* number of bytes currently reserved for
683 delayed allocation */
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
689 int force_delalloc; /* make people start doing filemap_flush until
690 we're under a threshold */
692 struct list_head list;
694 /* for controlling how we free up space for allocations */
695 wait_queue_head_t allocate_wait;
696 wait_queue_head_t flush_wait;
697 int allocating_chunk;
700 /* for block groups in our same type */
701 struct list_head block_groups;
703 struct rw_semaphore groups_sem;
704 atomic_t caching_threads;
708 * free clusters are used to claim free space in relatively large chunks,
709 * allowing us to do less seeky writes. They are used for all metadata
710 * allocations and data allocations in ssd mode.
712 struct btrfs_free_cluster {
714 spinlock_t refill_lock;
717 /* largest extent in this cluster */
720 /* first extent starting offset */
723 /* if this cluster simply points at a bitmap in the block group */
724 bool points_to_bitmap;
726 struct btrfs_block_group_cache *block_group;
728 * when a cluster is allocated from a block group, we put the
729 * cluster onto a list in the block group so that it can
730 * be freed before the block group is freed.
732 struct list_head block_group_list;
735 enum btrfs_caching_type {
737 BTRFS_CACHE_STARTED = 1,
738 BTRFS_CACHE_FINISHED = 2,
741 struct btrfs_caching_control {
742 struct list_head list;
744 wait_queue_head_t wait;
745 struct btrfs_block_group_cache *block_group;
750 struct btrfs_block_group_cache {
751 struct btrfs_key key;
752 struct btrfs_block_group_item item;
753 struct btrfs_fs_info *fs_info;
766 /* cache tracking stuff */
768 struct btrfs_caching_control *caching_ctl;
769 u64 last_byte_to_unpin;
771 struct btrfs_space_info *space_info;
773 /* free space cache stuff */
774 spinlock_t tree_lock;
775 struct rb_root free_space_offset;
778 /* block group cache stuff */
779 struct rb_node cache_node;
781 /* for block groups in the same raid type */
782 struct list_head list;
787 /* List of struct btrfs_free_clusters for this block group.
788 * Today it will only have one thing on it, but that may change
790 struct list_head cluster_list;
793 struct reloc_control;
795 struct btrfs_fs_devices;
796 struct btrfs_fs_info {
797 u8 fsid[BTRFS_FSID_SIZE];
798 u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
799 struct btrfs_root *extent_root;
800 struct btrfs_root *tree_root;
801 struct btrfs_root *chunk_root;
802 struct btrfs_root *dev_root;
803 struct btrfs_root *fs_root;
804 struct btrfs_root *csum_root;
806 /* the log root tree is a directory of all the other log roots */
807 struct btrfs_root *log_root_tree;
809 spinlock_t fs_roots_radix_lock;
810 struct radix_tree_root fs_roots_radix;
812 /* block group cache stuff */
813 spinlock_t block_group_cache_lock;
814 struct rb_root block_group_cache_tree;
816 struct extent_io_tree freed_extents[2];
817 struct extent_io_tree *pinned_extents;
819 /* logical->physical extent mapping */
820 struct btrfs_mapping_tree mapping_tree;
823 u64 last_trans_committed;
826 * this is updated to the current trans every time a full commit
827 * is required instead of the faster short fsync log commits
829 u64 last_trans_log_full_commit;
830 u64 open_ioctl_trans;
831 unsigned long mount_opt;
835 struct btrfs_transaction *running_transaction;
836 wait_queue_head_t transaction_throttle;
837 wait_queue_head_t transaction_wait;
838 wait_queue_head_t async_submit_wait;
840 struct btrfs_super_block super_copy;
841 struct btrfs_super_block super_for_commit;
842 struct block_device *__bdev;
843 struct super_block *sb;
844 struct inode *btree_inode;
845 struct backing_dev_info bdi;
846 struct mutex trans_mutex;
847 struct mutex tree_log_mutex;
848 struct mutex transaction_kthread_mutex;
849 struct mutex cleaner_mutex;
850 struct mutex chunk_mutex;
851 struct mutex volume_mutex;
853 * this protects the ordered operations list only while we are
854 * processing all of the entries on it. This way we make
855 * sure the commit code doesn't find the list temporarily empty
856 * because another function happens to be doing non-waiting preflush
857 * before jumping into the main commit.
859 struct mutex ordered_operations_mutex;
860 struct rw_semaphore extent_commit_sem;
862 struct rw_semaphore subvol_sem;
864 struct srcu_struct subvol_srcu;
866 struct list_head trans_list;
867 struct list_head hashers;
868 struct list_head dead_roots;
869 struct list_head caching_block_groups;
871 atomic_t nr_async_submits;
872 atomic_t async_submit_draining;
873 atomic_t nr_async_bios;
874 atomic_t async_delalloc_pages;
877 * this is used by the balancing code to wait for all the pending
880 spinlock_t ordered_extent_lock;
883 * all of the data=ordered extents pending writeback
884 * these can span multiple transactions and basically include
885 * every dirty data page that isn't from nodatacow
887 struct list_head ordered_extents;
890 * all of the inodes that have delalloc bytes. It is possible for
891 * this list to be empty even when there is still dirty data=ordered
892 * extents waiting to finish IO.
894 struct list_head delalloc_inodes;
897 * special rename and truncate targets that must be on disk before
898 * we're allowed to commit. This is basically the ext3 style
901 struct list_head ordered_operations;
904 * there is a pool of worker threads for checksumming during writes
905 * and a pool for checksumming after reads. This is because readers
906 * can run with FS locks held, and the writers may be waiting for
907 * those locks. We don't want ordering in the pending list to cause
908 * deadlocks, and so the two are serviced separately.
910 * A third pool does submit_bio to avoid deadlocking with the other
913 struct btrfs_workers generic_worker;
914 struct btrfs_workers workers;
915 struct btrfs_workers delalloc_workers;
916 struct btrfs_workers endio_workers;
917 struct btrfs_workers endio_meta_workers;
918 struct btrfs_workers endio_meta_write_workers;
919 struct btrfs_workers endio_write_workers;
920 struct btrfs_workers submit_workers;
921 struct btrfs_workers enospc_workers;
923 * fixup workers take dirty pages that didn't properly go through
924 * the cow mechanism and make them safe to write. It happens
925 * for the sys_munmap function call path
927 struct btrfs_workers fixup_workers;
928 struct task_struct *transaction_kthread;
929 struct task_struct *cleaner_kthread;
930 int thread_pool_size;
932 struct kobject super_kobj;
933 struct completion kobj_unregister;
936 int log_root_recovering;
940 /* protected by the delalloc lock, used to keep from writing
941 * metadata until there is a nice batch
943 u64 dirty_metadata_bytes;
944 struct list_head dirty_cowonly_roots;
946 struct btrfs_fs_devices *fs_devices;
949 * the space_info list is almost entirely read only. It only changes
950 * when we add a new raid type to the FS, and that happens
951 * very rarely. RCU is used to protect it.
953 struct list_head space_info;
955 struct reloc_control *reloc_ctl;
957 spinlock_t delalloc_lock;
958 spinlock_t new_trans_lock;
961 /* data_alloc_cluster is only used in ssd mode */
962 struct btrfs_free_cluster data_alloc_cluster;
964 /* all metadata allocations go through this cluster */
965 struct btrfs_free_cluster meta_alloc_cluster;
967 spinlock_t ref_cache_lock;
968 u64 total_ref_cache_size;
970 u64 avail_data_alloc_bits;
971 u64 avail_metadata_alloc_bits;
972 u64 avail_system_alloc_bits;
973 u64 data_alloc_profile;
974 u64 metadata_alloc_profile;
975 u64 system_alloc_profile;
977 unsigned data_chunk_allocations;
978 unsigned metadata_ratio;
984 * in ram representation of the tree. extent_root is used for all allocations
985 * and for the extent tree extent_root root.
988 struct extent_buffer *node;
990 /* the node lock is held while changing the node pointer */
991 spinlock_t node_lock;
993 struct extent_buffer *commit_root;
994 struct btrfs_root *log_root;
995 struct btrfs_root *reloc_root;
997 struct btrfs_root_item root_item;
998 struct btrfs_key root_key;
999 struct btrfs_fs_info *fs_info;
1000 struct extent_io_tree dirty_log_pages;
1002 struct kobject root_kobj;
1003 struct completion kobj_unregister;
1004 struct mutex objectid_mutex;
1006 struct mutex log_mutex;
1007 wait_queue_head_t log_writer_wait;
1008 wait_queue_head_t log_commit_wait[2];
1009 atomic_t log_writers;
1010 atomic_t log_commit[2];
1011 unsigned long log_transid;
1012 unsigned long log_batch;
1013 pid_t log_start_pid;
1014 bool log_multiple_pids;
1019 /* data allocations are done in sectorsize units */
1022 /* node allocations are done in nodesize units */
1025 /* leaf allocations are done in leafsize units */
1032 u64 highest_objectid;
1037 u64 defrag_trans_start;
1038 struct btrfs_key defrag_progress;
1039 struct btrfs_key defrag_max;
1045 /* the dirty list is only used by non-reference counted roots */
1046 struct list_head dirty_list;
1048 struct list_head root_list;
1050 spinlock_t list_lock;
1051 struct list_head orphan_list;
1053 spinlock_t inode_lock;
1054 /* red-black tree that keeps track of in-memory inodes */
1055 struct rb_root inode_tree;
1058 * right now this just gets used so that a root has its own devid
1059 * for stat. It may be used for more later
1061 struct super_block anon_super;
1065 * inode items have the data typically returned from stat and store other
1066 * info about object characteristics. There is one for every file and dir in
1069 #define BTRFS_INODE_ITEM_KEY 1
1070 #define BTRFS_INODE_REF_KEY 12
1071 #define BTRFS_XATTR_ITEM_KEY 24
1072 #define BTRFS_ORPHAN_ITEM_KEY 48
1073 /* reserve 2-15 close to the inode for later flexibility */
1076 * dir items are the name -> inode pointers in a directory. There is one
1077 * for every name in a directory.
1079 #define BTRFS_DIR_LOG_ITEM_KEY 60
1080 #define BTRFS_DIR_LOG_INDEX_KEY 72
1081 #define BTRFS_DIR_ITEM_KEY 84
1082 #define BTRFS_DIR_INDEX_KEY 96
1084 * extent data is for file data
1086 #define BTRFS_EXTENT_DATA_KEY 108
1089 * extent csums are stored in a separate tree and hold csums for
1090 * an entire extent on disk.
1092 #define BTRFS_EXTENT_CSUM_KEY 128
1095 * root items point to tree roots. They are typically in the root
1096 * tree used by the super block to find all the other trees
1098 #define BTRFS_ROOT_ITEM_KEY 132
1101 * root backrefs tie subvols and snapshots to the directory entries that
1104 #define BTRFS_ROOT_BACKREF_KEY 144
1107 * root refs make a fast index for listing all of the snapshots and
1108 * subvolumes referenced by a given root. They point directly to the
1109 * directory item in the root that references the subvol
1111 #define BTRFS_ROOT_REF_KEY 156
1114 * extent items are in the extent map tree. These record which blocks
1115 * are used, and how many references there are to each block
1117 #define BTRFS_EXTENT_ITEM_KEY 168
1119 #define BTRFS_TREE_BLOCK_REF_KEY 176
1121 #define BTRFS_EXTENT_DATA_REF_KEY 178
1123 #define BTRFS_EXTENT_REF_V0_KEY 180
1125 #define BTRFS_SHARED_BLOCK_REF_KEY 182
1127 #define BTRFS_SHARED_DATA_REF_KEY 184
1130 * block groups give us hints into the extent allocation trees. Which
1131 * blocks are free etc etc
1133 #define BTRFS_BLOCK_GROUP_ITEM_KEY 192
1135 #define BTRFS_DEV_EXTENT_KEY 204
1136 #define BTRFS_DEV_ITEM_KEY 216
1137 #define BTRFS_CHUNK_ITEM_KEY 228
1140 * string items are for debugging. They just store a short string of
1143 #define BTRFS_STRING_ITEM_KEY 253
1145 #define BTRFS_MOUNT_NODATASUM (1 << 0)
1146 #define BTRFS_MOUNT_NODATACOW (1 << 1)
1147 #define BTRFS_MOUNT_NOBARRIER (1 << 2)
1148 #define BTRFS_MOUNT_SSD (1 << 3)
1149 #define BTRFS_MOUNT_DEGRADED (1 << 4)
1150 #define BTRFS_MOUNT_COMPRESS (1 << 5)
1151 #define BTRFS_MOUNT_NOTREELOG (1 << 6)
1152 #define BTRFS_MOUNT_FLUSHONCOMMIT (1 << 7)
1153 #define BTRFS_MOUNT_SSD_SPREAD (1 << 8)
1154 #define BTRFS_MOUNT_NOSSD (1 << 9)
1156 #define btrfs_clear_opt(o, opt) ((o) &= ~BTRFS_MOUNT_##opt)
1157 #define btrfs_set_opt(o, opt) ((o) |= BTRFS_MOUNT_##opt)
1158 #define btrfs_test_opt(root, opt) ((root)->fs_info->mount_opt & \
1163 #define BTRFS_INODE_NODATASUM (1 << 0)
1164 #define BTRFS_INODE_NODATACOW (1 << 1)
1165 #define BTRFS_INODE_READONLY (1 << 2)
1166 #define BTRFS_INODE_NOCOMPRESS (1 << 3)
1167 #define BTRFS_INODE_PREALLOC (1 << 4)
1168 #define BTRFS_INODE_SYNC (1 << 5)
1169 #define BTRFS_INODE_IMMUTABLE (1 << 6)
1170 #define BTRFS_INODE_APPEND (1 << 7)
1171 #define BTRFS_INODE_NODUMP (1 << 8)
1172 #define BTRFS_INODE_NOATIME (1 << 9)
1173 #define BTRFS_INODE_DIRSYNC (1 << 10)
1176 /* some macros to generate set/get funcs for the struct fields. This
1177 * assumes there is a lefoo_to_cpu for every type, so lets make a simple
1180 #define le8_to_cpu(v) (v)
1181 #define cpu_to_le8(v) (v)
1184 #define read_eb_member(eb, ptr, type, member, result) ( \
1185 read_extent_buffer(eb, (char *)(result), \
1186 ((unsigned long)(ptr)) + \
1187 offsetof(type, member), \
1188 sizeof(((type *)0)->member)))
1190 #define write_eb_member(eb, ptr, type, member, result) ( \
1191 write_extent_buffer(eb, (char *)(result), \
1192 ((unsigned long)(ptr)) + \
1193 offsetof(type, member), \
1194 sizeof(((type *)0)->member)))
1196 #ifndef BTRFS_SETGET_FUNCS
1197 #define BTRFS_SETGET_FUNCS(name, type, member, bits) \
1198 u##bits btrfs_##name(struct extent_buffer *eb, type *s); \
1199 void btrfs_set_##name(struct extent_buffer *eb, type *s, u##bits val);
1202 #define BTRFS_SETGET_HEADER_FUNCS(name, type, member, bits) \
1203 static inline u##bits btrfs_##name(struct extent_buffer *eb) \
1205 type *p = kmap_atomic(eb->first_page, KM_USER0); \
1206 u##bits res = le##bits##_to_cpu(p->member); \
1207 kunmap_atomic(p, KM_USER0); \
1210 static inline void btrfs_set_##name(struct extent_buffer *eb, \
1213 type *p = kmap_atomic(eb->first_page, KM_USER0); \
1214 p->member = cpu_to_le##bits(val); \
1215 kunmap_atomic(p, KM_USER0); \
1218 #define BTRFS_SETGET_STACK_FUNCS(name, type, member, bits) \
1219 static inline u##bits btrfs_##name(type *s) \
1221 return le##bits##_to_cpu(s->member); \
1223 static inline void btrfs_set_##name(type *s, u##bits val) \
1225 s->member = cpu_to_le##bits(val); \
1228 BTRFS_SETGET_FUNCS(device_type, struct btrfs_dev_item, type, 64);
1229 BTRFS_SETGET_FUNCS(device_total_bytes, struct btrfs_dev_item, total_bytes, 64);
1230 BTRFS_SETGET_FUNCS(device_bytes_used, struct btrfs_dev_item, bytes_used, 64);
1231 BTRFS_SETGET_FUNCS(device_io_align, struct btrfs_dev_item, io_align, 32);
1232 BTRFS_SETGET_FUNCS(device_io_width, struct btrfs_dev_item, io_width, 32);
1233 BTRFS_SETGET_FUNCS(device_start_offset, struct btrfs_dev_item,
1235 BTRFS_SETGET_FUNCS(device_sector_size, struct btrfs_dev_item, sector_size, 32);
1236 BTRFS_SETGET_FUNCS(device_id, struct btrfs_dev_item, devid, 64);
1237 BTRFS_SETGET_FUNCS(device_group, struct btrfs_dev_item, dev_group, 32);
1238 BTRFS_SETGET_FUNCS(device_seek_speed, struct btrfs_dev_item, seek_speed, 8);
1239 BTRFS_SETGET_FUNCS(device_bandwidth, struct btrfs_dev_item, bandwidth, 8);
1240 BTRFS_SETGET_FUNCS(device_generation, struct btrfs_dev_item, generation, 64);
1242 BTRFS_SETGET_STACK_FUNCS(stack_device_type, struct btrfs_dev_item, type, 64);
1243 BTRFS_SETGET_STACK_FUNCS(stack_device_total_bytes, struct btrfs_dev_item,
1245 BTRFS_SETGET_STACK_FUNCS(stack_device_bytes_used, struct btrfs_dev_item,
1247 BTRFS_SETGET_STACK_FUNCS(stack_device_io_align, struct btrfs_dev_item,
1249 BTRFS_SETGET_STACK_FUNCS(stack_device_io_width, struct btrfs_dev_item,
1251 BTRFS_SETGET_STACK_FUNCS(stack_device_sector_size, struct btrfs_dev_item,
1253 BTRFS_SETGET_STACK_FUNCS(stack_device_id, struct btrfs_dev_item, devid, 64);
1254 BTRFS_SETGET_STACK_FUNCS(stack_device_group, struct btrfs_dev_item,
1256 BTRFS_SETGET_STACK_FUNCS(stack_device_seek_speed, struct btrfs_dev_item,
1258 BTRFS_SETGET_STACK_FUNCS(stack_device_bandwidth, struct btrfs_dev_item,
1260 BTRFS_SETGET_STACK_FUNCS(stack_device_generation, struct btrfs_dev_item,
1263 static inline char *btrfs_device_uuid(struct btrfs_dev_item *d)
1265 return (char *)d + offsetof(struct btrfs_dev_item, uuid);
1268 static inline char *btrfs_device_fsid(struct btrfs_dev_item *d)
1270 return (char *)d + offsetof(struct btrfs_dev_item, fsid);
1273 BTRFS_SETGET_FUNCS(chunk_length, struct btrfs_chunk, length, 64);
1274 BTRFS_SETGET_FUNCS(chunk_owner, struct btrfs_chunk, owner, 64);
1275 BTRFS_SETGET_FUNCS(chunk_stripe_len, struct btrfs_chunk, stripe_len, 64);
1276 BTRFS_SETGET_FUNCS(chunk_io_align, struct btrfs_chunk, io_align, 32);
1277 BTRFS_SETGET_FUNCS(chunk_io_width, struct btrfs_chunk, io_width, 32);
1278 BTRFS_SETGET_FUNCS(chunk_sector_size, struct btrfs_chunk, sector_size, 32);
1279 BTRFS_SETGET_FUNCS(chunk_type, struct btrfs_chunk, type, 64);
1280 BTRFS_SETGET_FUNCS(chunk_num_stripes, struct btrfs_chunk, num_stripes, 16);
1281 BTRFS_SETGET_FUNCS(chunk_sub_stripes, struct btrfs_chunk, sub_stripes, 16);
1282 BTRFS_SETGET_FUNCS(stripe_devid, struct btrfs_stripe, devid, 64);
1283 BTRFS_SETGET_FUNCS(stripe_offset, struct btrfs_stripe, offset, 64);
1285 static inline char *btrfs_stripe_dev_uuid(struct btrfs_stripe *s)
1287 return (char *)s + offsetof(struct btrfs_stripe, dev_uuid);
1290 BTRFS_SETGET_STACK_FUNCS(stack_chunk_length, struct btrfs_chunk, length, 64);
1291 BTRFS_SETGET_STACK_FUNCS(stack_chunk_owner, struct btrfs_chunk, owner, 64);
1292 BTRFS_SETGET_STACK_FUNCS(stack_chunk_stripe_len, struct btrfs_chunk,
1294 BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_align, struct btrfs_chunk,
1296 BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_width, struct btrfs_chunk,
1298 BTRFS_SETGET_STACK_FUNCS(stack_chunk_sector_size, struct btrfs_chunk,
1300 BTRFS_SETGET_STACK_FUNCS(stack_chunk_type, struct btrfs_chunk, type, 64);
1301 BTRFS_SETGET_STACK_FUNCS(stack_chunk_num_stripes, struct btrfs_chunk,
1303 BTRFS_SETGET_STACK_FUNCS(stack_chunk_sub_stripes, struct btrfs_chunk,
1305 BTRFS_SETGET_STACK_FUNCS(stack_stripe_devid, struct btrfs_stripe, devid, 64);
1306 BTRFS_SETGET_STACK_FUNCS(stack_stripe_offset, struct btrfs_stripe, offset, 64);
1308 static inline struct btrfs_stripe *btrfs_stripe_nr(struct btrfs_chunk *c,
1311 unsigned long offset = (unsigned long)c;
1312 offset += offsetof(struct btrfs_chunk, stripe);
1313 offset += nr * sizeof(struct btrfs_stripe);
1314 return (struct btrfs_stripe *)offset;
1317 static inline char *btrfs_stripe_dev_uuid_nr(struct btrfs_chunk *c, int nr)
1319 return btrfs_stripe_dev_uuid(btrfs_stripe_nr(c, nr));
1322 static inline u64 btrfs_stripe_offset_nr(struct extent_buffer *eb,
1323 struct btrfs_chunk *c, int nr)
1325 return btrfs_stripe_offset(eb, btrfs_stripe_nr(c, nr));
1328 static inline void btrfs_set_stripe_offset_nr(struct extent_buffer *eb,
1329 struct btrfs_chunk *c, int nr,
1332 btrfs_set_stripe_offset(eb, btrfs_stripe_nr(c, nr), val);
1335 static inline u64 btrfs_stripe_devid_nr(struct extent_buffer *eb,
1336 struct btrfs_chunk *c, int nr)
1338 return btrfs_stripe_devid(eb, btrfs_stripe_nr(c, nr));
1341 static inline void btrfs_set_stripe_devid_nr(struct extent_buffer *eb,
1342 struct btrfs_chunk *c, int nr,
1345 btrfs_set_stripe_devid(eb, btrfs_stripe_nr(c, nr), val);
1348 /* struct btrfs_block_group_item */
1349 BTRFS_SETGET_STACK_FUNCS(block_group_used, struct btrfs_block_group_item,
1351 BTRFS_SETGET_FUNCS(disk_block_group_used, struct btrfs_block_group_item,
1353 BTRFS_SETGET_STACK_FUNCS(block_group_chunk_objectid,
1354 struct btrfs_block_group_item, chunk_objectid, 64);
1356 BTRFS_SETGET_FUNCS(disk_block_group_chunk_objectid,
1357 struct btrfs_block_group_item, chunk_objectid, 64);
1358 BTRFS_SETGET_FUNCS(disk_block_group_flags,
1359 struct btrfs_block_group_item, flags, 64);
1360 BTRFS_SETGET_STACK_FUNCS(block_group_flags,
1361 struct btrfs_block_group_item, flags, 64);
1363 /* struct btrfs_inode_ref */
1364 BTRFS_SETGET_FUNCS(inode_ref_name_len, struct btrfs_inode_ref, name_len, 16);
1365 BTRFS_SETGET_FUNCS(inode_ref_index, struct btrfs_inode_ref, index, 64);
1367 /* struct btrfs_inode_item */
1368 BTRFS_SETGET_FUNCS(inode_generation, struct btrfs_inode_item, generation, 64);
1369 BTRFS_SETGET_FUNCS(inode_sequence, struct btrfs_inode_item, sequence, 64);
1370 BTRFS_SETGET_FUNCS(inode_transid, struct btrfs_inode_item, transid, 64);
1371 BTRFS_SETGET_FUNCS(inode_size, struct btrfs_inode_item, size, 64);
1372 BTRFS_SETGET_FUNCS(inode_nbytes, struct btrfs_inode_item, nbytes, 64);
1373 BTRFS_SETGET_FUNCS(inode_block_group, struct btrfs_inode_item, block_group, 64);
1374 BTRFS_SETGET_FUNCS(inode_nlink, struct btrfs_inode_item, nlink, 32);
1375 BTRFS_SETGET_FUNCS(inode_uid, struct btrfs_inode_item, uid, 32);
1376 BTRFS_SETGET_FUNCS(inode_gid, struct btrfs_inode_item, gid, 32);
1377 BTRFS_SETGET_FUNCS(inode_mode, struct btrfs_inode_item, mode, 32);
1378 BTRFS_SETGET_FUNCS(inode_rdev, struct btrfs_inode_item, rdev, 64);
1379 BTRFS_SETGET_FUNCS(inode_flags, struct btrfs_inode_item, flags, 64);
1381 static inline struct btrfs_timespec *
1382 btrfs_inode_atime(struct btrfs_inode_item *inode_item)
1384 unsigned long ptr = (unsigned long)inode_item;
1385 ptr += offsetof(struct btrfs_inode_item, atime);
1386 return (struct btrfs_timespec *)ptr;
1389 static inline struct btrfs_timespec *
1390 btrfs_inode_mtime(struct btrfs_inode_item *inode_item)
1392 unsigned long ptr = (unsigned long)inode_item;
1393 ptr += offsetof(struct btrfs_inode_item, mtime);
1394 return (struct btrfs_timespec *)ptr;
1397 static inline struct btrfs_timespec *
1398 btrfs_inode_ctime(struct btrfs_inode_item *inode_item)
1400 unsigned long ptr = (unsigned long)inode_item;
1401 ptr += offsetof(struct btrfs_inode_item, ctime);
1402 return (struct btrfs_timespec *)ptr;
1405 static inline struct btrfs_timespec *
1406 btrfs_inode_otime(struct btrfs_inode_item *inode_item)
1408 unsigned long ptr = (unsigned long)inode_item;
1409 ptr += offsetof(struct btrfs_inode_item, otime);
1410 return (struct btrfs_timespec *)ptr;
1413 BTRFS_SETGET_FUNCS(timespec_sec, struct btrfs_timespec, sec, 64);
1414 BTRFS_SETGET_FUNCS(timespec_nsec, struct btrfs_timespec, nsec, 32);
1416 /* struct btrfs_dev_extent */
1417 BTRFS_SETGET_FUNCS(dev_extent_chunk_tree, struct btrfs_dev_extent,
1419 BTRFS_SETGET_FUNCS(dev_extent_chunk_objectid, struct btrfs_dev_extent,
1420 chunk_objectid, 64);
1421 BTRFS_SETGET_FUNCS(dev_extent_chunk_offset, struct btrfs_dev_extent,
1423 BTRFS_SETGET_FUNCS(dev_extent_length, struct btrfs_dev_extent, length, 64);
1425 static inline u8 *btrfs_dev_extent_chunk_tree_uuid(struct btrfs_dev_extent *dev)
1427 unsigned long ptr = offsetof(struct btrfs_dev_extent, chunk_tree_uuid);
1428 return (u8 *)((unsigned long)dev + ptr);
1431 BTRFS_SETGET_FUNCS(extent_refs, struct btrfs_extent_item, refs, 64);
1432 BTRFS_SETGET_FUNCS(extent_generation, struct btrfs_extent_item,
1434 BTRFS_SETGET_FUNCS(extent_flags, struct btrfs_extent_item, flags, 64);
1436 BTRFS_SETGET_FUNCS(extent_refs_v0, struct btrfs_extent_item_v0, refs, 32);
1439 BTRFS_SETGET_FUNCS(tree_block_level, struct btrfs_tree_block_info, level, 8);
1441 static inline void btrfs_tree_block_key(struct extent_buffer *eb,
1442 struct btrfs_tree_block_info *item,
1443 struct btrfs_disk_key *key)
1445 read_eb_member(eb, item, struct btrfs_tree_block_info, key, key);
1448 static inline void btrfs_set_tree_block_key(struct extent_buffer *eb,
1449 struct btrfs_tree_block_info *item,
1450 struct btrfs_disk_key *key)
1452 write_eb_member(eb, item, struct btrfs_tree_block_info, key, key);
1455 BTRFS_SETGET_FUNCS(extent_data_ref_root, struct btrfs_extent_data_ref,
1457 BTRFS_SETGET_FUNCS(extent_data_ref_objectid, struct btrfs_extent_data_ref,
1459 BTRFS_SETGET_FUNCS(extent_data_ref_offset, struct btrfs_extent_data_ref,
1461 BTRFS_SETGET_FUNCS(extent_data_ref_count, struct btrfs_extent_data_ref,
1464 BTRFS_SETGET_FUNCS(shared_data_ref_count, struct btrfs_shared_data_ref,
1467 BTRFS_SETGET_FUNCS(extent_inline_ref_type, struct btrfs_extent_inline_ref,
1469 BTRFS_SETGET_FUNCS(extent_inline_ref_offset, struct btrfs_extent_inline_ref,
1472 static inline u32 btrfs_extent_inline_ref_size(int type)
1474 if (type == BTRFS_TREE_BLOCK_REF_KEY ||
1475 type == BTRFS_SHARED_BLOCK_REF_KEY)
1476 return sizeof(struct btrfs_extent_inline_ref);
1477 if (type == BTRFS_SHARED_DATA_REF_KEY)
1478 return sizeof(struct btrfs_shared_data_ref) +
1479 sizeof(struct btrfs_extent_inline_ref);
1480 if (type == BTRFS_EXTENT_DATA_REF_KEY)
1481 return sizeof(struct btrfs_extent_data_ref) +
1482 offsetof(struct btrfs_extent_inline_ref, offset);
1487 BTRFS_SETGET_FUNCS(ref_root_v0, struct btrfs_extent_ref_v0, root, 64);
1488 BTRFS_SETGET_FUNCS(ref_generation_v0, struct btrfs_extent_ref_v0,
1490 BTRFS_SETGET_FUNCS(ref_objectid_v0, struct btrfs_extent_ref_v0, objectid, 64);
1491 BTRFS_SETGET_FUNCS(ref_count_v0, struct btrfs_extent_ref_v0, count, 32);
1493 /* struct btrfs_node */
1494 BTRFS_SETGET_FUNCS(key_blockptr, struct btrfs_key_ptr, blockptr, 64);
1495 BTRFS_SETGET_FUNCS(key_generation, struct btrfs_key_ptr, generation, 64);
1497 static inline u64 btrfs_node_blockptr(struct extent_buffer *eb, int nr)
1500 ptr = offsetof(struct btrfs_node, ptrs) +
1501 sizeof(struct btrfs_key_ptr) * nr;
1502 return btrfs_key_blockptr(eb, (struct btrfs_key_ptr *)ptr);
1505 static inline void btrfs_set_node_blockptr(struct extent_buffer *eb,
1509 ptr = offsetof(struct btrfs_node, ptrs) +
1510 sizeof(struct btrfs_key_ptr) * nr;
1511 btrfs_set_key_blockptr(eb, (struct btrfs_key_ptr *)ptr, val);
1514 static inline u64 btrfs_node_ptr_generation(struct extent_buffer *eb, int nr)
1517 ptr = offsetof(struct btrfs_node, ptrs) +
1518 sizeof(struct btrfs_key_ptr) * nr;
1519 return btrfs_key_generation(eb, (struct btrfs_key_ptr *)ptr);
1522 static inline void btrfs_set_node_ptr_generation(struct extent_buffer *eb,
1526 ptr = offsetof(struct btrfs_node, ptrs) +
1527 sizeof(struct btrfs_key_ptr) * nr;
1528 btrfs_set_key_generation(eb, (struct btrfs_key_ptr *)ptr, val);
1531 static inline unsigned long btrfs_node_key_ptr_offset(int nr)
1533 return offsetof(struct btrfs_node, ptrs) +
1534 sizeof(struct btrfs_key_ptr) * nr;
1537 void btrfs_node_key(struct extent_buffer *eb,
1538 struct btrfs_disk_key *disk_key, int nr);
1540 static inline void btrfs_set_node_key(struct extent_buffer *eb,
1541 struct btrfs_disk_key *disk_key, int nr)
1544 ptr = btrfs_node_key_ptr_offset(nr);
1545 write_eb_member(eb, (struct btrfs_key_ptr *)ptr,
1546 struct btrfs_key_ptr, key, disk_key);
1549 /* struct btrfs_item */
1550 BTRFS_SETGET_FUNCS(item_offset, struct btrfs_item, offset, 32);
1551 BTRFS_SETGET_FUNCS(item_size, struct btrfs_item, size, 32);
1553 static inline unsigned long btrfs_item_nr_offset(int nr)
1555 return offsetof(struct btrfs_leaf, items) +
1556 sizeof(struct btrfs_item) * nr;
1559 static inline struct btrfs_item *btrfs_item_nr(struct extent_buffer *eb,
1562 return (struct btrfs_item *)btrfs_item_nr_offset(nr);
1565 static inline u32 btrfs_item_end(struct extent_buffer *eb,
1566 struct btrfs_item *item)
1568 return btrfs_item_offset(eb, item) + btrfs_item_size(eb, item);
1571 static inline u32 btrfs_item_end_nr(struct extent_buffer *eb, int nr)
1573 return btrfs_item_end(eb, btrfs_item_nr(eb, nr));
1576 static inline u32 btrfs_item_offset_nr(struct extent_buffer *eb, int nr)
1578 return btrfs_item_offset(eb, btrfs_item_nr(eb, nr));
1581 static inline u32 btrfs_item_size_nr(struct extent_buffer *eb, int nr)
1583 return btrfs_item_size(eb, btrfs_item_nr(eb, nr));
1586 static inline void btrfs_item_key(struct extent_buffer *eb,
1587 struct btrfs_disk_key *disk_key, int nr)
1589 struct btrfs_item *item = btrfs_item_nr(eb, nr);
1590 read_eb_member(eb, item, struct btrfs_item, key, disk_key);
1593 static inline void btrfs_set_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 write_eb_member(eb, item, struct btrfs_item, key, disk_key);
1600 BTRFS_SETGET_FUNCS(dir_log_end, struct btrfs_dir_log_item, end, 64);
1603 * struct btrfs_root_ref
1605 BTRFS_SETGET_FUNCS(root_ref_dirid, struct btrfs_root_ref, dirid, 64);
1606 BTRFS_SETGET_FUNCS(root_ref_sequence, struct btrfs_root_ref, sequence, 64);
1607 BTRFS_SETGET_FUNCS(root_ref_name_len, struct btrfs_root_ref, name_len, 16);
1609 /* struct btrfs_dir_item */
1610 BTRFS_SETGET_FUNCS(dir_data_len, struct btrfs_dir_item, data_len, 16);
1611 BTRFS_SETGET_FUNCS(dir_type, struct btrfs_dir_item, type, 8);
1612 BTRFS_SETGET_FUNCS(dir_name_len, struct btrfs_dir_item, name_len, 16);
1613 BTRFS_SETGET_FUNCS(dir_transid, struct btrfs_dir_item, transid, 64);
1615 static inline void btrfs_dir_item_key(struct extent_buffer *eb,
1616 struct btrfs_dir_item *item,
1617 struct btrfs_disk_key *key)
1619 read_eb_member(eb, item, struct btrfs_dir_item, location, key);
1622 static inline void btrfs_set_dir_item_key(struct extent_buffer *eb,
1623 struct btrfs_dir_item *item,
1624 struct btrfs_disk_key *key)
1626 write_eb_member(eb, item, struct btrfs_dir_item, location, key);
1629 /* struct btrfs_disk_key */
1630 BTRFS_SETGET_STACK_FUNCS(disk_key_objectid, struct btrfs_disk_key,
1632 BTRFS_SETGET_STACK_FUNCS(disk_key_offset, struct btrfs_disk_key, offset, 64);
1633 BTRFS_SETGET_STACK_FUNCS(disk_key_type, struct btrfs_disk_key, type, 8);
1635 static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu,
1636 struct btrfs_disk_key *disk)
1638 cpu->offset = le64_to_cpu(disk->offset);
1639 cpu->type = disk->type;
1640 cpu->objectid = le64_to_cpu(disk->objectid);
1643 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk,
1644 struct btrfs_key *cpu)
1646 disk->offset = cpu_to_le64(cpu->offset);
1647 disk->type = cpu->type;
1648 disk->objectid = cpu_to_le64(cpu->objectid);
1651 static inline void btrfs_node_key_to_cpu(struct extent_buffer *eb,
1652 struct btrfs_key *key, int nr)
1654 struct btrfs_disk_key disk_key;
1655 btrfs_node_key(eb, &disk_key, nr);
1656 btrfs_disk_key_to_cpu(key, &disk_key);
1659 static inline void btrfs_item_key_to_cpu(struct extent_buffer *eb,
1660 struct btrfs_key *key, int nr)
1662 struct btrfs_disk_key disk_key;
1663 btrfs_item_key(eb, &disk_key, nr);
1664 btrfs_disk_key_to_cpu(key, &disk_key);
1667 static inline void btrfs_dir_item_key_to_cpu(struct extent_buffer *eb,
1668 struct btrfs_dir_item *item,
1669 struct btrfs_key *key)
1671 struct btrfs_disk_key disk_key;
1672 btrfs_dir_item_key(eb, item, &disk_key);
1673 btrfs_disk_key_to_cpu(key, &disk_key);
1677 static inline u8 btrfs_key_type(struct btrfs_key *key)
1682 static inline void btrfs_set_key_type(struct btrfs_key *key, u8 val)
1687 /* struct btrfs_header */
1688 BTRFS_SETGET_HEADER_FUNCS(header_bytenr, struct btrfs_header, bytenr, 64);
1689 BTRFS_SETGET_HEADER_FUNCS(header_generation, struct btrfs_header,
1691 BTRFS_SETGET_HEADER_FUNCS(header_owner, struct btrfs_header, owner, 64);
1692 BTRFS_SETGET_HEADER_FUNCS(header_nritems, struct btrfs_header, nritems, 32);
1693 BTRFS_SETGET_HEADER_FUNCS(header_flags, struct btrfs_header, flags, 64);
1694 BTRFS_SETGET_HEADER_FUNCS(header_level, struct btrfs_header, level, 8);
1696 static inline int btrfs_header_flag(struct extent_buffer *eb, u64 flag)
1698 return (btrfs_header_flags(eb) & flag) == flag;
1701 static inline int btrfs_set_header_flag(struct extent_buffer *eb, u64 flag)
1703 u64 flags = btrfs_header_flags(eb);
1704 btrfs_set_header_flags(eb, flags | flag);
1705 return (flags & flag) == flag;
1708 static inline int btrfs_clear_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_header_backref_rev(struct extent_buffer *eb)
1717 u64 flags = btrfs_header_flags(eb);
1718 return flags >> BTRFS_BACKREF_REV_SHIFT;
1721 static inline void btrfs_set_header_backref_rev(struct extent_buffer *eb,
1724 u64 flags = btrfs_header_flags(eb);
1725 flags &= ~BTRFS_BACKREF_REV_MASK;
1726 flags |= (u64)rev << BTRFS_BACKREF_REV_SHIFT;
1727 btrfs_set_header_flags(eb, flags);
1730 static inline u8 *btrfs_header_fsid(struct extent_buffer *eb)
1732 unsigned long ptr = offsetof(struct btrfs_header, fsid);
1736 static inline u8 *btrfs_header_chunk_tree_uuid(struct extent_buffer *eb)
1738 unsigned long ptr = offsetof(struct btrfs_header, chunk_tree_uuid);
1742 static inline u8 *btrfs_super_fsid(struct extent_buffer *eb)
1744 unsigned long ptr = offsetof(struct btrfs_super_block, fsid);
1748 static inline u8 *btrfs_header_csum(struct extent_buffer *eb)
1750 unsigned long ptr = offsetof(struct btrfs_header, csum);
1754 static inline struct btrfs_node *btrfs_buffer_node(struct extent_buffer *eb)
1759 static inline struct btrfs_leaf *btrfs_buffer_leaf(struct extent_buffer *eb)
1764 static inline struct btrfs_header *btrfs_buffer_header(struct extent_buffer *eb)
1769 static inline int btrfs_is_leaf(struct extent_buffer *eb)
1771 return btrfs_header_level(eb) == 0;
1774 /* struct btrfs_root_item */
1775 BTRFS_SETGET_FUNCS(disk_root_generation, struct btrfs_root_item,
1777 BTRFS_SETGET_FUNCS(disk_root_refs, struct btrfs_root_item, refs, 32);
1778 BTRFS_SETGET_FUNCS(disk_root_bytenr, struct btrfs_root_item, bytenr, 64);
1779 BTRFS_SETGET_FUNCS(disk_root_level, struct btrfs_root_item, level, 8);
1781 BTRFS_SETGET_STACK_FUNCS(root_generation, struct btrfs_root_item,
1783 BTRFS_SETGET_STACK_FUNCS(root_bytenr, struct btrfs_root_item, bytenr, 64);
1784 BTRFS_SETGET_STACK_FUNCS(root_level, struct btrfs_root_item, level, 8);
1785 BTRFS_SETGET_STACK_FUNCS(root_dirid, struct btrfs_root_item, root_dirid, 64);
1786 BTRFS_SETGET_STACK_FUNCS(root_refs, struct btrfs_root_item, refs, 32);
1787 BTRFS_SETGET_STACK_FUNCS(root_flags, struct btrfs_root_item, flags, 64);
1788 BTRFS_SETGET_STACK_FUNCS(root_used, struct btrfs_root_item, bytes_used, 64);
1789 BTRFS_SETGET_STACK_FUNCS(root_limit, struct btrfs_root_item, byte_limit, 64);
1790 BTRFS_SETGET_STACK_FUNCS(root_last_snapshot, struct btrfs_root_item,
1793 /* struct btrfs_super_block */
1795 BTRFS_SETGET_STACK_FUNCS(super_bytenr, struct btrfs_super_block, bytenr, 64);
1796 BTRFS_SETGET_STACK_FUNCS(super_flags, struct btrfs_super_block, flags, 64);
1797 BTRFS_SETGET_STACK_FUNCS(super_generation, struct btrfs_super_block,
1799 BTRFS_SETGET_STACK_FUNCS(super_root, struct btrfs_super_block, root, 64);
1800 BTRFS_SETGET_STACK_FUNCS(super_sys_array_size,
1801 struct btrfs_super_block, sys_chunk_array_size, 32);
1802 BTRFS_SETGET_STACK_FUNCS(super_chunk_root_generation,
1803 struct btrfs_super_block, chunk_root_generation, 64);
1804 BTRFS_SETGET_STACK_FUNCS(super_root_level, struct btrfs_super_block,
1806 BTRFS_SETGET_STACK_FUNCS(super_chunk_root, struct btrfs_super_block,
1808 BTRFS_SETGET_STACK_FUNCS(super_chunk_root_level, struct btrfs_super_block,
1809 chunk_root_level, 8);
1810 BTRFS_SETGET_STACK_FUNCS(super_log_root, struct btrfs_super_block,
1812 BTRFS_SETGET_STACK_FUNCS(super_log_root_transid, struct btrfs_super_block,
1813 log_root_transid, 64);
1814 BTRFS_SETGET_STACK_FUNCS(super_log_root_level, struct btrfs_super_block,
1816 BTRFS_SETGET_STACK_FUNCS(super_total_bytes, struct btrfs_super_block,
1818 BTRFS_SETGET_STACK_FUNCS(super_bytes_used, struct btrfs_super_block,
1820 BTRFS_SETGET_STACK_FUNCS(super_sectorsize, struct btrfs_super_block,
1822 BTRFS_SETGET_STACK_FUNCS(super_nodesize, struct btrfs_super_block,
1824 BTRFS_SETGET_STACK_FUNCS(super_leafsize, struct btrfs_super_block,
1826 BTRFS_SETGET_STACK_FUNCS(super_stripesize, struct btrfs_super_block,
1828 BTRFS_SETGET_STACK_FUNCS(super_root_dir, struct btrfs_super_block,
1829 root_dir_objectid, 64);
1830 BTRFS_SETGET_STACK_FUNCS(super_num_devices, struct btrfs_super_block,
1832 BTRFS_SETGET_STACK_FUNCS(super_compat_flags, struct btrfs_super_block,
1834 BTRFS_SETGET_STACK_FUNCS(super_compat_ro_flags, struct btrfs_super_block,
1836 BTRFS_SETGET_STACK_FUNCS(super_incompat_flags, struct btrfs_super_block,
1837 incompat_flags, 64);
1838 BTRFS_SETGET_STACK_FUNCS(super_csum_type, struct btrfs_super_block,
1841 static inline int btrfs_super_csum_size(struct btrfs_super_block *s)
1843 int t = btrfs_super_csum_type(s);
1844 BUG_ON(t >= ARRAY_SIZE(btrfs_csum_sizes));
1845 return btrfs_csum_sizes[t];
1848 static inline unsigned long btrfs_leaf_data(struct extent_buffer *l)
1850 return offsetof(struct btrfs_leaf, items);
1853 /* struct btrfs_file_extent_item */
1854 BTRFS_SETGET_FUNCS(file_extent_type, struct btrfs_file_extent_item, type, 8);
1856 static inline unsigned long
1857 btrfs_file_extent_inline_start(struct btrfs_file_extent_item *e)
1859 unsigned long offset = (unsigned long)e;
1860 offset += offsetof(struct btrfs_file_extent_item, disk_bytenr);
1864 static inline u32 btrfs_file_extent_calc_inline_size(u32 datasize)
1866 return offsetof(struct btrfs_file_extent_item, disk_bytenr) + datasize;
1869 BTRFS_SETGET_FUNCS(file_extent_disk_bytenr, struct btrfs_file_extent_item,
1871 BTRFS_SETGET_FUNCS(file_extent_generation, struct btrfs_file_extent_item,
1873 BTRFS_SETGET_FUNCS(file_extent_disk_num_bytes, struct btrfs_file_extent_item,
1874 disk_num_bytes, 64);
1875 BTRFS_SETGET_FUNCS(file_extent_offset, struct btrfs_file_extent_item,
1877 BTRFS_SETGET_FUNCS(file_extent_num_bytes, struct btrfs_file_extent_item,
1879 BTRFS_SETGET_FUNCS(file_extent_ram_bytes, struct btrfs_file_extent_item,
1881 BTRFS_SETGET_FUNCS(file_extent_compression, struct btrfs_file_extent_item,
1883 BTRFS_SETGET_FUNCS(file_extent_encryption, struct btrfs_file_extent_item,
1885 BTRFS_SETGET_FUNCS(file_extent_other_encoding, struct btrfs_file_extent_item,
1886 other_encoding, 16);
1888 /* this returns the number of file bytes represented by the inline item.
1889 * If an item is compressed, this is the uncompressed size
1891 static inline u32 btrfs_file_extent_inline_len(struct extent_buffer *eb,
1892 struct btrfs_file_extent_item *e)
1894 return btrfs_file_extent_ram_bytes(eb, e);
1898 * this returns the number of bytes used by the item on disk, minus the
1899 * size of any extent headers. If a file is compressed on disk, this is
1900 * the compressed size
1902 static inline u32 btrfs_file_extent_inline_item_len(struct extent_buffer *eb,
1903 struct btrfs_item *e)
1905 unsigned long offset;
1906 offset = offsetof(struct btrfs_file_extent_item, disk_bytenr);
1907 return btrfs_item_size(eb, e) - offset;
1910 static inline struct btrfs_root *btrfs_sb(struct super_block *sb)
1912 return sb->s_fs_info;
1915 static inline int btrfs_set_root_name(struct btrfs_root *root,
1916 const char *name, int len)
1918 /* if we already have a name just free it */
1921 root->name = kmalloc(len+1, GFP_KERNEL);
1925 memcpy(root->name, name, len);
1926 root->name[len] = '\0';
1931 static inline u32 btrfs_level_size(struct btrfs_root *root, int level)
1934 return root->leafsize;
1935 return root->nodesize;
1938 /* helper function to cast into the data area of the leaf. */
1939 #define btrfs_item_ptr(leaf, slot, type) \
1940 ((type *)(btrfs_leaf_data(leaf) + \
1941 btrfs_item_offset_nr(leaf, slot)))
1943 #define btrfs_item_ptr_offset(leaf, slot) \
1944 ((unsigned long)(btrfs_leaf_data(leaf) + \
1945 btrfs_item_offset_nr(leaf, slot)))
1947 static inline struct dentry *fdentry(struct file *file)
1949 return file->f_path.dentry;
1953 void btrfs_put_block_group(struct btrfs_block_group_cache *cache);
1954 int btrfs_run_delayed_refs(struct btrfs_trans_handle *trans,
1955 struct btrfs_root *root, unsigned long count);
1956 int btrfs_lookup_extent(struct btrfs_root *root, u64 start, u64 len);
1957 int btrfs_pin_extent(struct btrfs_root *root,
1958 u64 bytenr, u64 num, int reserved);
1959 int btrfs_drop_leaf_ref(struct btrfs_trans_handle *trans,
1960 struct btrfs_root *root, struct extent_buffer *leaf);
1961 int btrfs_cross_ref_exist(struct btrfs_trans_handle *trans,
1962 struct btrfs_root *root,
1963 u64 objectid, u64 offset, u64 bytenr);
1964 int btrfs_copy_pinned(struct btrfs_root *root, struct extent_io_tree *copy);
1965 struct btrfs_block_group_cache *btrfs_lookup_block_group(
1966 struct btrfs_fs_info *info,
1968 void btrfs_put_block_group(struct btrfs_block_group_cache *cache);
1969 u64 btrfs_find_block_group(struct btrfs_root *root,
1970 u64 search_start, u64 search_hint, int owner);
1971 struct extent_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
1972 struct btrfs_root *root, u32 blocksize,
1973 u64 parent, u64 root_objectid,
1974 struct btrfs_disk_key *key, int level,
1975 u64 hint, u64 empty_size);
1976 struct extent_buffer *btrfs_init_new_buffer(struct btrfs_trans_handle *trans,
1977 struct btrfs_root *root,
1978 u64 bytenr, u32 blocksize,
1980 int btrfs_alloc_reserved_file_extent(struct btrfs_trans_handle *trans,
1981 struct btrfs_root *root,
1982 u64 root_objectid, u64 owner,
1983 u64 offset, struct btrfs_key *ins);
1984 int btrfs_alloc_logged_file_extent(struct btrfs_trans_handle *trans,
1985 struct btrfs_root *root,
1986 u64 root_objectid, u64 owner, u64 offset,
1987 struct btrfs_key *ins);
1988 int btrfs_reserve_extent(struct btrfs_trans_handle *trans,
1989 struct btrfs_root *root,
1990 u64 num_bytes, u64 min_alloc_size,
1991 u64 empty_size, u64 hint_byte,
1992 u64 search_end, struct btrfs_key *ins,
1994 int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1995 struct extent_buffer *buf, int full_backref);
1996 int btrfs_dec_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1997 struct extent_buffer *buf, int full_backref);
1998 int btrfs_set_disk_extent_flags(struct btrfs_trans_handle *trans,
1999 struct btrfs_root *root,
2000 u64 bytenr, u64 num_bytes, u64 flags,
2002 int btrfs_free_extent(struct btrfs_trans_handle *trans,
2003 struct btrfs_root *root,
2004 u64 bytenr, u64 num_bytes, u64 parent,
2005 u64 root_objectid, u64 owner, u64 offset);
2007 int btrfs_free_reserved_extent(struct btrfs_root *root, u64 start, u64 len);
2008 int btrfs_prepare_extent_commit(struct btrfs_trans_handle *trans,
2009 struct btrfs_root *root);
2010 int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans,
2011 struct btrfs_root *root);
2012 int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
2013 struct btrfs_root *root,
2014 u64 bytenr, u64 num_bytes, u64 parent,
2015 u64 root_objectid, u64 owner, u64 offset);
2017 int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans,
2018 struct btrfs_root *root);
2019 int btrfs_extent_readonly(struct btrfs_root *root, u64 bytenr);
2020 int btrfs_free_block_groups(struct btrfs_fs_info *info);
2021 int btrfs_read_block_groups(struct btrfs_root *root);
2022 int btrfs_can_relocate(struct btrfs_root *root, u64 bytenr);
2023 int btrfs_make_block_group(struct btrfs_trans_handle *trans,
2024 struct btrfs_root *root, u64 bytes_used,
2025 u64 type, u64 chunk_objectid, u64 chunk_offset,
2027 int btrfs_remove_block_group(struct btrfs_trans_handle *trans,
2028 struct btrfs_root *root, u64 group_start);
2029 int btrfs_prepare_block_group_relocation(struct btrfs_root *root,
2030 struct btrfs_block_group_cache *group);
2032 u64 btrfs_reduce_alloc_profile(struct btrfs_root *root, u64 flags);
2033 void btrfs_set_inode_space_info(struct btrfs_root *root, struct inode *ionde);
2034 void btrfs_clear_space_info_full(struct btrfs_fs_info *info);
2036 int btrfs_reserve_metadata_space(struct btrfs_root *root, int num_items);
2037 int btrfs_unreserve_metadata_space(struct btrfs_root *root, int num_items);
2038 int btrfs_unreserve_metadata_for_delalloc(struct btrfs_root *root,
2039 struct inode *inode, int num_items);
2040 int btrfs_reserve_metadata_for_delalloc(struct btrfs_root *root,
2041 struct inode *inode, int num_items);
2042 int btrfs_check_data_free_space(struct btrfs_root *root, struct inode *inode,
2044 void btrfs_free_reserved_data_space(struct btrfs_root *root,
2045 struct inode *inode, u64 bytes);
2046 void btrfs_delalloc_reserve_space(struct btrfs_root *root, struct inode *inode,
2048 void btrfs_delalloc_free_space(struct btrfs_root *root, struct inode *inode,
2051 int btrfs_bin_search(struct extent_buffer *eb, struct btrfs_key *key,
2052 int level, int *slot);
2053 int btrfs_comp_cpu_keys(struct btrfs_key *k1, struct btrfs_key *k2);
2054 int btrfs_previous_item(struct btrfs_root *root,
2055 struct btrfs_path *path, u64 min_objectid,
2057 int btrfs_set_item_key_safe(struct btrfs_trans_handle *trans,
2058 struct btrfs_root *root, struct btrfs_path *path,
2059 struct btrfs_key *new_key);
2060 struct extent_buffer *btrfs_root_node(struct btrfs_root *root);
2061 struct extent_buffer *btrfs_lock_root_node(struct btrfs_root *root);
2062 int btrfs_find_next_key(struct btrfs_root *root, struct btrfs_path *path,
2063 struct btrfs_key *key, int lowest_level,
2064 int cache_only, u64 min_trans);
2065 int btrfs_search_forward(struct btrfs_root *root, struct btrfs_key *min_key,
2066 struct btrfs_key *max_key,
2067 struct btrfs_path *path, int cache_only,
2069 int btrfs_cow_block(struct btrfs_trans_handle *trans,
2070 struct btrfs_root *root, struct extent_buffer *buf,
2071 struct extent_buffer *parent, int parent_slot,
2072 struct extent_buffer **cow_ret);
2073 int btrfs_copy_root(struct btrfs_trans_handle *trans,
2074 struct btrfs_root *root,
2075 struct extent_buffer *buf,
2076 struct extent_buffer **cow_ret, u64 new_root_objectid);
2077 int btrfs_block_can_be_shared(struct btrfs_root *root,
2078 struct extent_buffer *buf);
2079 int btrfs_extend_item(struct btrfs_trans_handle *trans, struct btrfs_root
2080 *root, struct btrfs_path *path, u32 data_size);
2081 int btrfs_truncate_item(struct btrfs_trans_handle *trans,
2082 struct btrfs_root *root,
2083 struct btrfs_path *path,
2084 u32 new_size, int from_end);
2085 int btrfs_split_item(struct btrfs_trans_handle *trans,
2086 struct btrfs_root *root,
2087 struct btrfs_path *path,
2088 struct btrfs_key *new_key,
2089 unsigned long split_offset);
2090 int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root
2091 *root, struct btrfs_key *key, struct btrfs_path *p, int
2093 int btrfs_realloc_node(struct btrfs_trans_handle *trans,
2094 struct btrfs_root *root, struct extent_buffer *parent,
2095 int start_slot, int cache_only, u64 *last_ret,
2096 struct btrfs_key *progress);
2097 void btrfs_release_path(struct btrfs_root *root, struct btrfs_path *p);
2098 struct btrfs_path *btrfs_alloc_path(void);
2099 void btrfs_free_path(struct btrfs_path *p);
2100 void btrfs_set_path_blocking(struct btrfs_path *p);
2101 void btrfs_unlock_up_safe(struct btrfs_path *p, int level);
2103 int btrfs_del_items(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2104 struct btrfs_path *path, int slot, int nr);
2105 static inline int btrfs_del_item(struct btrfs_trans_handle *trans,
2106 struct btrfs_root *root,
2107 struct btrfs_path *path)
2109 return btrfs_del_items(trans, root, path, path->slots[0], 1);
2112 int btrfs_insert_item(struct btrfs_trans_handle *trans, struct btrfs_root
2113 *root, struct btrfs_key *key, void *data, u32 data_size);
2114 int btrfs_insert_some_items(struct btrfs_trans_handle *trans,
2115 struct btrfs_root *root,
2116 struct btrfs_path *path,
2117 struct btrfs_key *cpu_key, u32 *data_size,
2119 int btrfs_insert_empty_items(struct btrfs_trans_handle *trans,
2120 struct btrfs_root *root,
2121 struct btrfs_path *path,
2122 struct btrfs_key *cpu_key, u32 *data_size, int nr);
2124 static inline int btrfs_insert_empty_item(struct btrfs_trans_handle *trans,
2125 struct btrfs_root *root,
2126 struct btrfs_path *path,
2127 struct btrfs_key *key,
2130 return btrfs_insert_empty_items(trans, root, path, key, &data_size, 1);
2133 int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path);
2134 int btrfs_prev_leaf(struct btrfs_root *root, struct btrfs_path *path);
2135 int btrfs_leaf_free_space(struct btrfs_root *root, struct extent_buffer *leaf);
2136 int btrfs_drop_snapshot(struct btrfs_root *root, int update_ref);
2137 int btrfs_drop_subtree(struct btrfs_trans_handle *trans,
2138 struct btrfs_root *root,
2139 struct extent_buffer *node,
2140 struct extent_buffer *parent);
2142 int btrfs_find_root_ref(struct btrfs_root *tree_root,
2143 struct btrfs_path *path,
2144 u64 root_id, u64 ref_id);
2145 int btrfs_add_root_ref(struct btrfs_trans_handle *trans,
2146 struct btrfs_root *tree_root,
2147 u64 root_id, u64 ref_id, u64 dirid, u64 sequence,
2148 const char *name, int name_len);
2149 int btrfs_del_root_ref(struct btrfs_trans_handle *trans,
2150 struct btrfs_root *tree_root,
2151 u64 root_id, u64 ref_id, u64 dirid, u64 *sequence,
2152 const char *name, int name_len);
2153 int btrfs_del_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2154 struct btrfs_key *key);
2155 int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root
2156 *root, struct btrfs_key *key, struct btrfs_root_item
2158 int btrfs_update_root(struct btrfs_trans_handle *trans, struct btrfs_root
2159 *root, struct btrfs_key *key, struct btrfs_root_item
2161 int btrfs_find_last_root(struct btrfs_root *root, u64 objectid, struct
2162 btrfs_root_item *item, struct btrfs_key *key);
2163 int btrfs_search_root(struct btrfs_root *root, u64 search_start,
2164 u64 *found_objectid);
2165 int btrfs_find_dead_roots(struct btrfs_root *root, u64 objectid);
2166 int btrfs_find_orphan_roots(struct btrfs_root *tree_root);
2167 int btrfs_set_root_node(struct btrfs_root_item *item,
2168 struct extent_buffer *node);
2170 int btrfs_insert_dir_item(struct btrfs_trans_handle *trans,
2171 struct btrfs_root *root, const char *name,
2172 int name_len, u64 dir,
2173 struct btrfs_key *location, u8 type, u64 index);
2174 struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans,
2175 struct btrfs_root *root,
2176 struct btrfs_path *path, u64 dir,
2177 const char *name, int name_len,
2179 struct btrfs_dir_item *
2180 btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans,
2181 struct btrfs_root *root,
2182 struct btrfs_path *path, u64 dir,
2183 u64 objectid, const char *name, int name_len,
2185 struct btrfs_dir_item *
2186 btrfs_search_dir_index_item(struct btrfs_root *root,
2187 struct btrfs_path *path, u64 dirid,
2188 const char *name, int name_len);
2189 struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_root *root,
2190 struct btrfs_path *path,
2191 const char *name, int name_len);
2192 int btrfs_delete_one_dir_name(struct btrfs_trans_handle *trans,
2193 struct btrfs_root *root,
2194 struct btrfs_path *path,
2195 struct btrfs_dir_item *di);
2196 int btrfs_insert_xattr_item(struct btrfs_trans_handle *trans,
2197 struct btrfs_root *root, const char *name,
2198 u16 name_len, const void *data, u16 data_len,
2200 struct btrfs_dir_item *btrfs_lookup_xattr(struct btrfs_trans_handle *trans,
2201 struct btrfs_root *root,
2202 struct btrfs_path *path, u64 dir,
2203 const char *name, u16 name_len,
2207 int btrfs_insert_orphan_item(struct btrfs_trans_handle *trans,
2208 struct btrfs_root *root, u64 offset);
2209 int btrfs_del_orphan_item(struct btrfs_trans_handle *trans,
2210 struct btrfs_root *root, u64 offset);
2211 int btrfs_find_orphan_item(struct btrfs_root *root, u64 offset);
2214 int btrfs_find_free_objectid(struct btrfs_trans_handle *trans,
2215 struct btrfs_root *fs_root,
2216 u64 dirid, u64 *objectid);
2217 int btrfs_find_highest_inode(struct btrfs_root *fs_root, u64 *objectid);
2220 int btrfs_insert_inode_ref(struct btrfs_trans_handle *trans,
2221 struct btrfs_root *root,
2222 const char *name, int name_len,
2223 u64 inode_objectid, u64 ref_objectid, u64 index);
2224 int btrfs_del_inode_ref(struct btrfs_trans_handle *trans,
2225 struct btrfs_root *root,
2226 const char *name, int name_len,
2227 u64 inode_objectid, u64 ref_objectid, u64 *index);
2228 int btrfs_insert_empty_inode(struct btrfs_trans_handle *trans,
2229 struct btrfs_root *root,
2230 struct btrfs_path *path, u64 objectid);
2231 int btrfs_lookup_inode(struct btrfs_trans_handle *trans, struct btrfs_root
2232 *root, struct btrfs_path *path,
2233 struct btrfs_key *location, int mod);
2236 int btrfs_del_csums(struct btrfs_trans_handle *trans,
2237 struct btrfs_root *root, u64 bytenr, u64 len);
2238 int btrfs_lookup_bio_sums(struct btrfs_root *root, struct inode *inode,
2239 struct bio *bio, u32 *dst);
2240 int btrfs_insert_file_extent(struct btrfs_trans_handle *trans,
2241 struct btrfs_root *root,
2242 u64 objectid, u64 pos,
2243 u64 disk_offset, u64 disk_num_bytes,
2244 u64 num_bytes, u64 offset, u64 ram_bytes,
2245 u8 compression, u8 encryption, u16 other_encoding);
2246 int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
2247 struct btrfs_root *root,
2248 struct btrfs_path *path, u64 objectid,
2249 u64 bytenr, int mod);
2250 int btrfs_csum_file_blocks(struct btrfs_trans_handle *trans,
2251 struct btrfs_root *root,
2252 struct btrfs_ordered_sum *sums);
2253 int btrfs_csum_one_bio(struct btrfs_root *root, struct inode *inode,
2254 struct bio *bio, u64 file_start, int contig);
2255 int btrfs_csum_file_bytes(struct btrfs_root *root, struct inode *inode,
2256 u64 start, unsigned long len);
2257 struct btrfs_csum_item *btrfs_lookup_csum(struct btrfs_trans_handle *trans,
2258 struct btrfs_root *root,
2259 struct btrfs_path *path,
2260 u64 bytenr, int cow);
2261 int btrfs_csum_truncate(struct btrfs_trans_handle *trans,
2262 struct btrfs_root *root, struct btrfs_path *path,
2264 int btrfs_lookup_csums_range(struct btrfs_root *root, u64 start,
2265 u64 end, struct list_head *list);
2268 /* RHEL and EL kernels have a patch that renames PG_checked to FsMisc */
2269 #if defined(ClearPageFsMisc) && !defined(ClearPageChecked)
2270 #define ClearPageChecked ClearPageFsMisc
2271 #define SetPageChecked SetPageFsMisc
2272 #define PageChecked PageFsMisc
2275 struct inode *btrfs_lookup_dentry(struct inode *dir, struct dentry *dentry);
2276 int btrfs_set_inode_index(struct inode *dir, u64 *index);
2277 int btrfs_unlink_inode(struct btrfs_trans_handle *trans,
2278 struct btrfs_root *root,
2279 struct inode *dir, struct inode *inode,
2280 const char *name, int name_len);
2281 int btrfs_add_link(struct btrfs_trans_handle *trans,
2282 struct inode *parent_inode, struct inode *inode,
2283 const char *name, int name_len, int add_backref, u64 index);
2284 int btrfs_unlink_subvol(struct btrfs_trans_handle *trans,
2285 struct btrfs_root *root,
2286 struct inode *dir, u64 objectid,
2287 const char *name, int name_len);
2288 int btrfs_truncate_inode_items(struct btrfs_trans_handle *trans,
2289 struct btrfs_root *root,
2290 struct inode *inode, u64 new_size,
2293 int btrfs_start_delalloc_inodes(struct btrfs_root *root);
2294 int btrfs_set_extent_delalloc(struct inode *inode, u64 start, u64 end);
2295 int btrfs_writepages(struct address_space *mapping,
2296 struct writeback_control *wbc);
2297 int btrfs_create_subvol_root(struct btrfs_trans_handle *trans,
2298 struct btrfs_root *new_root,
2299 u64 new_dirid, u64 alloc_hint);
2300 int btrfs_merge_bio_hook(struct page *page, unsigned long offset,
2301 size_t size, struct bio *bio, unsigned long bio_flags);
2303 unsigned long btrfs_force_ra(struct address_space *mapping,
2304 struct file_ra_state *ra, struct file *file,
2305 pgoff_t offset, pgoff_t last_index);
2306 int btrfs_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf);
2307 int btrfs_readpage(struct file *file, struct page *page);
2308 void btrfs_delete_inode(struct inode *inode);
2309 void btrfs_put_inode(struct inode *inode);
2310 int btrfs_write_inode(struct inode *inode, int wait);
2311 void btrfs_dirty_inode(struct inode *inode);
2312 struct inode *btrfs_alloc_inode(struct super_block *sb);
2313 void btrfs_destroy_inode(struct inode *inode);
2314 void btrfs_drop_inode(struct inode *inode);
2315 int btrfs_init_cachep(void);
2316 void btrfs_destroy_cachep(void);
2317 long btrfs_ioctl_trans_end(struct file *file);
2318 struct inode *btrfs_iget(struct super_block *s, struct btrfs_key *location,
2319 struct btrfs_root *root);
2320 int btrfs_commit_write(struct file *file, struct page *page,
2321 unsigned from, unsigned to);
2322 struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page,
2323 size_t page_offset, u64 start, u64 end,
2325 int btrfs_update_inode(struct btrfs_trans_handle *trans,
2326 struct btrfs_root *root,
2327 struct inode *inode);
2328 int btrfs_orphan_add(struct btrfs_trans_handle *trans, struct inode *inode);
2329 int btrfs_orphan_del(struct btrfs_trans_handle *trans, struct inode *inode);
2330 void btrfs_orphan_cleanup(struct btrfs_root *root);
2331 int btrfs_cont_expand(struct inode *inode, loff_t size);
2332 int btrfs_invalidate_inodes(struct btrfs_root *root);
2333 extern struct dentry_operations btrfs_dentry_operations;
2336 long btrfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
2337 void btrfs_update_iflags(struct inode *inode);
2338 void btrfs_inherit_iflags(struct inode *inode, struct inode *dir);
2341 int btrfs_sync_file(struct file *file, struct dentry *dentry, int datasync);
2342 int btrfs_drop_extent_cache(struct inode *inode, u64 start, u64 end,
2344 int btrfs_check_file(struct btrfs_root *root, struct inode *inode);
2345 extern struct file_operations btrfs_file_operations;
2346 int btrfs_drop_extents(struct btrfs_trans_handle *trans,
2347 struct btrfs_root *root, struct inode *inode,
2348 u64 start, u64 end, u64 locked_end,
2349 u64 inline_limit, u64 *hint_block, int drop_cache);
2350 int btrfs_mark_extent_written(struct btrfs_trans_handle *trans,
2351 struct btrfs_root *root,
2352 struct inode *inode, u64 start, u64 end);
2353 int btrfs_release_file(struct inode *inode, struct file *file);
2356 int btrfs_defrag_leaves(struct btrfs_trans_handle *trans,
2357 struct btrfs_root *root, int cache_only);
2360 int btrfs_init_sysfs(void);
2361 void btrfs_exit_sysfs(void);
2362 int btrfs_sysfs_add_super(struct btrfs_fs_info *fs);
2363 int btrfs_sysfs_add_root(struct btrfs_root *root);
2364 void btrfs_sysfs_del_root(struct btrfs_root *root);
2365 void btrfs_sysfs_del_super(struct btrfs_fs_info *root);
2368 ssize_t btrfs_listxattr(struct dentry *dentry, char *buffer, size_t size);
2371 u64 btrfs_parse_size(char *str);
2372 int btrfs_parse_options(struct btrfs_root *root, char *options);
2373 int btrfs_sync_fs(struct super_block *sb, int wait);
2376 #ifdef CONFIG_BTRFS_POSIX_ACL
2377 int btrfs_check_acl(struct inode *inode, int mask);
2379 #define btrfs_check_acl NULL
2381 int btrfs_init_acl(struct inode *inode, struct inode *dir);
2382 int btrfs_acl_chmod(struct inode *inode);
2385 int btrfs_relocate_block_group(struct btrfs_root *root, u64 group_start);
2386 int btrfs_init_reloc_root(struct btrfs_trans_handle *trans,
2387 struct btrfs_root *root);
2388 int btrfs_update_reloc_root(struct btrfs_trans_handle *trans,
2389 struct btrfs_root *root);
2390 int btrfs_recover_relocation(struct btrfs_root *root);
2391 int btrfs_reloc_clone_csums(struct inode *inode, u64 file_pos, u64 len);