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
118 * we can actually store much bigger names, but lets not confuse the rest
121 #define BTRFS_NAME_LEN 255
123 /* 32 bytes in various csum fields */
124 #define BTRFS_CSUM_SIZE 32
127 #define BTRFS_CSUM_TYPE_CRC32 0
129 static int btrfs_csum_sizes[] = { 4, 0 };
131 /* four bytes for CRC32 */
132 #define BTRFS_EMPTY_DIR_SIZE 0
134 #define BTRFS_FT_UNKNOWN 0
135 #define BTRFS_FT_REG_FILE 1
136 #define BTRFS_FT_DIR 2
137 #define BTRFS_FT_CHRDEV 3
138 #define BTRFS_FT_BLKDEV 4
139 #define BTRFS_FT_FIFO 5
140 #define BTRFS_FT_SOCK 6
141 #define BTRFS_FT_SYMLINK 7
142 #define BTRFS_FT_XATTR 8
143 #define BTRFS_FT_MAX 9
146 * The key defines the order in the tree, and so it also defines (optimal)
149 * objectid corresponds to the inode number.
151 * type tells us things about the object, and is a kind of stream selector.
152 * so for a given inode, keys with type of 1 might refer to the inode data,
153 * type of 2 may point to file data in the btree and type == 3 may point to
156 * offset is the starting byte offset for this key in the stream.
158 * btrfs_disk_key is in disk byte order. struct btrfs_key is always
159 * in cpu native order. Otherwise they are identical and their sizes
160 * should be the same (ie both packed)
162 struct btrfs_disk_key {
166 } __attribute__ ((__packed__));
172 } __attribute__ ((__packed__));
174 struct btrfs_mapping_tree {
175 struct extent_map_tree map_tree;
178 #define BTRFS_UUID_SIZE 16
179 struct btrfs_dev_item {
180 /* the internal btrfs device id */
183 /* size of the device */
189 /* optimal io alignment for this device */
192 /* optimal io width for this device */
195 /* minimal io size for this device */
198 /* type and info about this device */
201 /* expected generation for this device */
205 * starting byte of this partition on the device,
206 * to allow for stripe alignment in the future
210 /* grouping information for allocation decisions */
213 /* seek speed 0-100 where 100 is fastest */
216 /* bandwidth 0-100 where 100 is fastest */
219 /* btrfs generated uuid for this device */
220 u8 uuid[BTRFS_UUID_SIZE];
222 /* uuid of FS who owns this device */
223 u8 fsid[BTRFS_UUID_SIZE];
224 } __attribute__ ((__packed__));
226 struct btrfs_stripe {
229 u8 dev_uuid[BTRFS_UUID_SIZE];
230 } __attribute__ ((__packed__));
233 /* size of this chunk in bytes */
236 /* objectid of the root referencing this chunk */
242 /* optimal io alignment for this chunk */
245 /* optimal io width for this chunk */
248 /* minimal io size for this chunk */
251 /* 2^16 stripes is quite a lot, a second limit is the size of a single
256 /* sub stripes only matter for raid10 */
258 struct btrfs_stripe stripe;
259 /* additional stripes go here */
260 } __attribute__ ((__packed__));
262 static inline unsigned long btrfs_chunk_item_size(int num_stripes)
264 BUG_ON(num_stripes == 0);
265 return sizeof(struct btrfs_chunk) +
266 sizeof(struct btrfs_stripe) * (num_stripes - 1);
269 #define BTRFS_FSID_SIZE 16
270 #define BTRFS_HEADER_FLAG_WRITTEN (1ULL << 0)
271 #define BTRFS_HEADER_FLAG_RELOC (1ULL << 1)
272 #define BTRFS_SUPER_FLAG_SEEDING (1ULL << 32)
273 #define BTRFS_SUPER_FLAG_METADUMP (1ULL << 33)
275 #define BTRFS_BACKREF_REV_MAX 256
276 #define BTRFS_BACKREF_REV_SHIFT 56
277 #define BTRFS_BACKREF_REV_MASK (((u64)BTRFS_BACKREF_REV_MAX - 1) << \
278 BTRFS_BACKREF_REV_SHIFT)
280 #define BTRFS_OLD_BACKREF_REV 0
281 #define BTRFS_MIXED_BACKREF_REV 1
284 * every tree block (leaf or node) starts with this header.
286 struct btrfs_header {
287 /* these first four must match the super block */
288 u8 csum[BTRFS_CSUM_SIZE];
289 u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
290 __le64 bytenr; /* which block this node is supposed to live in */
293 /* allowed to be different from the super from here on down */
294 u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
299 } __attribute__ ((__packed__));
301 #define BTRFS_NODEPTRS_PER_BLOCK(r) (((r)->nodesize - \
302 sizeof(struct btrfs_header)) / \
303 sizeof(struct btrfs_key_ptr))
304 #define __BTRFS_LEAF_DATA_SIZE(bs) ((bs) - sizeof(struct btrfs_header))
305 #define BTRFS_LEAF_DATA_SIZE(r) (__BTRFS_LEAF_DATA_SIZE(r->leafsize))
306 #define BTRFS_MAX_INLINE_DATA_SIZE(r) (BTRFS_LEAF_DATA_SIZE(r) - \
307 sizeof(struct btrfs_item) - \
308 sizeof(struct btrfs_file_extent_item))
312 * this is a very generous portion of the super block, giving us
313 * room to translate 14 chunks with 3 stripes each.
315 #define BTRFS_SYSTEM_CHUNK_ARRAY_SIZE 2048
316 #define BTRFS_LABEL_SIZE 256
319 * the super block basically lists the main trees of the FS
320 * it currently lacks any block count etc etc
322 struct btrfs_super_block {
323 u8 csum[BTRFS_CSUM_SIZE];
324 /* the first 4 fields must match struct btrfs_header */
325 u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
326 __le64 bytenr; /* this block number */
329 /* allowed to be different from the btrfs_header from here own down */
336 /* this will help find the new super based on the log root */
337 __le64 log_root_transid;
340 __le64 root_dir_objectid;
346 __le32 sys_chunk_array_size;
347 __le64 chunk_root_generation;
349 __le64 compat_ro_flags;
350 __le64 incompat_flags;
355 struct btrfs_dev_item dev_item;
357 char label[BTRFS_LABEL_SIZE];
359 /* future expansion */
361 u8 sys_chunk_array[BTRFS_SYSTEM_CHUNK_ARRAY_SIZE];
362 } __attribute__ ((__packed__));
365 * Compat flags that we support. If any incompat flags are set other than the
366 * ones specified below then we will fail to mount
368 #define BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF (1ULL << 0)
370 #define BTRFS_FEATURE_COMPAT_SUPP 0ULL
371 #define BTRFS_FEATURE_COMPAT_RO_SUPP 0ULL
372 #define BTRFS_FEATURE_INCOMPAT_SUPP \
373 BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF
376 * A leaf is full of items. offset and size tell us where to find
377 * the item in the leaf (relative to the start of the data area)
380 struct btrfs_disk_key key;
383 } __attribute__ ((__packed__));
386 * leaves have an item area and a data area:
387 * [item0, item1....itemN] [free space] [dataN...data1, data0]
389 * The data is separate from the items to get the keys closer together
393 struct btrfs_header header;
394 struct btrfs_item items[];
395 } __attribute__ ((__packed__));
398 * all non-leaf blocks are nodes, they hold only keys and pointers to
401 struct btrfs_key_ptr {
402 struct btrfs_disk_key key;
405 } __attribute__ ((__packed__));
408 struct btrfs_header header;
409 struct btrfs_key_ptr ptrs[];
410 } __attribute__ ((__packed__));
413 * btrfs_paths remember the path taken from the root down to the leaf.
414 * level 0 is always the leaf, and nodes[1...BTRFS_MAX_LEVEL] will point
415 * to any other levels that are present.
417 * The slots array records the index of the item or block pointer
418 * used while walking the tree.
421 struct extent_buffer *nodes[BTRFS_MAX_LEVEL];
422 int slots[BTRFS_MAX_LEVEL];
423 /* if there is real range locking, this locks field will change */
424 int locks[BTRFS_MAX_LEVEL];
426 /* keep some upper locks as we walk down */
430 * set by btrfs_split_item, tells search_slot to keep all locks
431 * and to force calls to keep space in the nodes
433 unsigned int search_for_split:1;
434 unsigned int keep_locks:1;
435 unsigned int skip_locking:1;
436 unsigned int leave_spinning:1;
437 unsigned int search_commit_root:1;
441 * items in the extent btree are used to record the objectid of the
442 * owner of the block and the number of references
445 struct btrfs_extent_item {
449 } __attribute__ ((__packed__));
451 struct btrfs_extent_item_v0 {
453 } __attribute__ ((__packed__));
455 #define BTRFS_MAX_EXTENT_ITEM_SIZE(r) ((BTRFS_LEAF_DATA_SIZE(r) >> 4) - \
456 sizeof(struct btrfs_item))
458 #define BTRFS_EXTENT_FLAG_DATA (1ULL << 0)
459 #define BTRFS_EXTENT_FLAG_TREE_BLOCK (1ULL << 1)
461 /* following flags only apply to tree blocks */
463 /* use full backrefs for extent pointers in the block */
464 #define BTRFS_BLOCK_FLAG_FULL_BACKREF (1ULL << 8)
466 struct btrfs_tree_block_info {
467 struct btrfs_disk_key key;
469 } __attribute__ ((__packed__));
471 struct btrfs_extent_data_ref {
476 } __attribute__ ((__packed__));
478 struct btrfs_shared_data_ref {
480 } __attribute__ ((__packed__));
482 struct btrfs_extent_inline_ref {
485 } __attribute__ ((__packed__));
487 /* old style backrefs item */
488 struct btrfs_extent_ref_v0 {
493 } __attribute__ ((__packed__));
496 /* dev extents record free space on individual devices. The owner
497 * field points back to the chunk allocation mapping tree that allocated
498 * the extent. The chunk tree uuid field is a way to double check the owner
500 struct btrfs_dev_extent {
502 __le64 chunk_objectid;
505 u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
506 } __attribute__ ((__packed__));
508 struct btrfs_inode_ref {
512 } __attribute__ ((__packed__));
514 struct btrfs_timespec {
517 } __attribute__ ((__packed__));
519 enum btrfs_compression_type {
520 BTRFS_COMPRESS_NONE = 0,
521 BTRFS_COMPRESS_ZLIB = 1,
522 BTRFS_COMPRESS_LAST = 2,
525 struct btrfs_inode_item {
526 /* nfs style generation number */
528 /* transid that last touched this inode */
540 /* modification sequence number for NFS */
544 * a little future expansion, for more than this we can
545 * just grow the inode item and version it
548 struct btrfs_timespec atime;
549 struct btrfs_timespec ctime;
550 struct btrfs_timespec mtime;
551 struct btrfs_timespec otime;
552 } __attribute__ ((__packed__));
554 struct btrfs_dir_log_item {
556 } __attribute__ ((__packed__));
558 struct btrfs_dir_item {
559 struct btrfs_disk_key location;
564 } __attribute__ ((__packed__));
566 struct btrfs_root_item {
567 struct btrfs_inode_item inode;
573 __le64 last_snapshot;
576 struct btrfs_disk_key drop_progress;
579 } __attribute__ ((__packed__));
582 * this is used for both forward and backward root refs
584 struct btrfs_root_ref {
588 } __attribute__ ((__packed__));
590 #define BTRFS_FILE_EXTENT_INLINE 0
591 #define BTRFS_FILE_EXTENT_REG 1
592 #define BTRFS_FILE_EXTENT_PREALLOC 2
594 struct btrfs_file_extent_item {
596 * transaction id that created this extent
600 * max number of bytes to hold this extent in ram
601 * when we split a compressed extent we can't know how big
602 * each of the resulting pieces will be. So, this is
603 * an upper limit on the size of the extent in ram instead of
609 * 32 bits for the various ways we might encode the data,
610 * including compression and encryption. If any of these
611 * are set to something a given disk format doesn't understand
612 * it is treated like an incompat flag for reading and writing,
617 __le16 other_encoding; /* spare for later use */
619 /* are we inline data or a real extent? */
623 * disk space consumed by the extent, checksum blocks are included
627 __le64 disk_num_bytes;
629 * the logical offset in file blocks (no csums)
630 * this extent record is for. This allows a file extent to point
631 * into the middle of an existing extent on disk, sharing it
632 * between two snapshots (useful if some bytes in the middle of the
633 * extent have changed
637 * the logical number of file blocks (no csums included). This
638 * always reflects the size uncompressed and without encoding.
642 } __attribute__ ((__packed__));
644 struct btrfs_csum_item {
646 } __attribute__ ((__packed__));
648 /* different types of block groups (and chunks) */
649 #define BTRFS_BLOCK_GROUP_DATA (1 << 0)
650 #define BTRFS_BLOCK_GROUP_SYSTEM (1 << 1)
651 #define BTRFS_BLOCK_GROUP_METADATA (1 << 2)
652 #define BTRFS_BLOCK_GROUP_RAID0 (1 << 3)
653 #define BTRFS_BLOCK_GROUP_RAID1 (1 << 4)
654 #define BTRFS_BLOCK_GROUP_DUP (1 << 5)
655 #define BTRFS_BLOCK_GROUP_RAID10 (1 << 6)
657 struct btrfs_block_group_item {
659 __le64 chunk_objectid;
661 } __attribute__ ((__packed__));
663 struct btrfs_space_info {
666 u64 total_bytes; /* total bytes in the space */
667 u64 bytes_used; /* total bytes used on disk */
668 u64 bytes_pinned; /* total bytes pinned, will be freed when the
669 transaction finishes */
670 u64 bytes_reserved; /* total bytes the allocator has reserved for
671 current allocations */
672 u64 bytes_readonly; /* total bytes that are read only */
674 /* delalloc accounting */
675 u64 bytes_delalloc; /* number of bytes reserved for allocation,
676 this space is not necessarily reserved yet
678 u64 bytes_may_use; /* number of bytes that may be used for
681 int full; /* indicates that we cannot allocate any more
682 chunks for this space */
683 int force_alloc; /* set if we need to force a chunk alloc for
686 struct list_head list;
688 /* for block groups in our same type */
689 struct list_head block_groups;
691 struct rw_semaphore groups_sem;
692 atomic_t caching_threads;
696 * free clusters are used to claim free space in relatively large chunks,
697 * allowing us to do less seeky writes. They are used for all metadata
698 * allocations and data allocations in ssd mode.
700 struct btrfs_free_cluster {
702 spinlock_t refill_lock;
705 /* largest extent in this cluster */
708 /* first extent starting offset */
711 /* if this cluster simply points at a bitmap in the block group */
712 bool points_to_bitmap;
714 struct btrfs_block_group_cache *block_group;
716 * when a cluster is allocated from a block group, we put the
717 * cluster onto a list in the block group so that it can
718 * be freed before the block group is freed.
720 struct list_head block_group_list;
723 enum btrfs_caching_type {
725 BTRFS_CACHE_STARTED = 1,
726 BTRFS_CACHE_FINISHED = 2,
729 struct btrfs_caching_control {
730 struct list_head list;
732 wait_queue_head_t wait;
733 struct btrfs_block_group_cache *block_group;
738 struct btrfs_block_group_cache {
739 struct btrfs_key key;
740 struct btrfs_block_group_item item;
741 struct btrfs_fs_info *fs_info;
753 /* cache tracking stuff */
755 struct btrfs_caching_control *caching_ctl;
756 u64 last_byte_to_unpin;
758 struct btrfs_space_info *space_info;
760 /* free space cache stuff */
761 spinlock_t tree_lock;
762 struct rb_root free_space_offset;
765 /* block group cache stuff */
766 struct rb_node cache_node;
768 /* for block groups in the same raid type */
769 struct list_head list;
774 /* List of struct btrfs_free_clusters for this block group.
775 * Today it will only have one thing on it, but that may change
777 struct list_head cluster_list;
780 struct reloc_control;
782 struct btrfs_fs_devices;
783 struct btrfs_fs_info {
784 u8 fsid[BTRFS_FSID_SIZE];
785 u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
786 struct btrfs_root *extent_root;
787 struct btrfs_root *tree_root;
788 struct btrfs_root *chunk_root;
789 struct btrfs_root *dev_root;
790 struct btrfs_root *fs_root;
791 struct btrfs_root *csum_root;
793 /* the log root tree is a directory of all the other log roots */
794 struct btrfs_root *log_root_tree;
795 struct radix_tree_root fs_roots_radix;
797 /* block group cache stuff */
798 spinlock_t block_group_cache_lock;
799 struct rb_root block_group_cache_tree;
801 struct extent_io_tree freed_extents[2];
802 struct extent_io_tree *pinned_extents;
804 /* logical->physical extent mapping */
805 struct btrfs_mapping_tree mapping_tree;
808 u64 last_trans_committed;
811 * this is updated to the current trans every time a full commit
812 * is required instead of the faster short fsync log commits
814 u64 last_trans_log_full_commit;
815 u64 open_ioctl_trans;
816 unsigned long mount_opt;
820 struct btrfs_transaction *running_transaction;
821 wait_queue_head_t transaction_throttle;
822 wait_queue_head_t transaction_wait;
823 wait_queue_head_t async_submit_wait;
825 struct btrfs_super_block super_copy;
826 struct btrfs_super_block super_for_commit;
827 struct block_device *__bdev;
828 struct super_block *sb;
829 struct inode *btree_inode;
830 struct backing_dev_info bdi;
831 struct mutex trans_mutex;
832 struct mutex tree_log_mutex;
833 struct mutex transaction_kthread_mutex;
834 struct mutex cleaner_mutex;
835 struct mutex chunk_mutex;
836 struct mutex drop_mutex;
837 struct mutex volume_mutex;
838 struct mutex tree_reloc_mutex;
840 * this protects the ordered operations list only while we are
841 * processing all of the entries on it. This way we make
842 * sure the commit code doesn't find the list temporarily empty
843 * because another function happens to be doing non-waiting preflush
844 * before jumping into the main commit.
846 struct mutex ordered_operations_mutex;
847 struct rw_semaphore extent_commit_sem;
849 struct list_head trans_list;
850 struct list_head hashers;
851 struct list_head dead_roots;
852 struct list_head caching_block_groups;
854 atomic_t nr_async_submits;
855 atomic_t async_submit_draining;
856 atomic_t nr_async_bios;
857 atomic_t async_delalloc_pages;
860 * this is used by the balancing code to wait for all the pending
863 spinlock_t ordered_extent_lock;
866 * all of the data=ordered extents pending writeback
867 * these can span multiple transactions and basically include
868 * every dirty data page that isn't from nodatacow
870 struct list_head ordered_extents;
873 * all of the inodes that have delalloc bytes. It is possible for
874 * this list to be empty even when there is still dirty data=ordered
875 * extents waiting to finish IO.
877 struct list_head delalloc_inodes;
880 * special rename and truncate targets that must be on disk before
881 * we're allowed to commit. This is basically the ext3 style
884 struct list_head ordered_operations;
887 * there is a pool of worker threads for checksumming during writes
888 * and a pool for checksumming after reads. This is because readers
889 * can run with FS locks held, and the writers may be waiting for
890 * those locks. We don't want ordering in the pending list to cause
891 * deadlocks, and so the two are serviced separately.
893 * A third pool does submit_bio to avoid deadlocking with the other
896 struct btrfs_workers workers;
897 struct btrfs_workers delalloc_workers;
898 struct btrfs_workers endio_workers;
899 struct btrfs_workers endio_meta_workers;
900 struct btrfs_workers endio_meta_write_workers;
901 struct btrfs_workers endio_write_workers;
902 struct btrfs_workers submit_workers;
904 * fixup workers take dirty pages that didn't properly go through
905 * the cow mechanism and make them safe to write. It happens
906 * for the sys_munmap function call path
908 struct btrfs_workers fixup_workers;
909 struct task_struct *transaction_kthread;
910 struct task_struct *cleaner_kthread;
911 int thread_pool_size;
913 struct kobject super_kobj;
914 struct completion kobj_unregister;
917 int log_root_recovering;
921 /* protected by the delalloc lock, used to keep from writing
922 * metadata until there is a nice batch
924 u64 dirty_metadata_bytes;
925 struct list_head dirty_cowonly_roots;
927 struct btrfs_fs_devices *fs_devices;
930 * the space_info list is almost entirely read only. It only changes
931 * when we add a new raid type to the FS, and that happens
932 * very rarely. RCU is used to protect it.
934 struct list_head space_info;
936 struct reloc_control *reloc_ctl;
938 spinlock_t delalloc_lock;
939 spinlock_t new_trans_lock;
942 /* data_alloc_cluster is only used in ssd mode */
943 struct btrfs_free_cluster data_alloc_cluster;
945 /* all metadata allocations go through this cluster */
946 struct btrfs_free_cluster meta_alloc_cluster;
948 spinlock_t ref_cache_lock;
949 u64 total_ref_cache_size;
951 u64 avail_data_alloc_bits;
952 u64 avail_metadata_alloc_bits;
953 u64 avail_system_alloc_bits;
954 u64 data_alloc_profile;
955 u64 metadata_alloc_profile;
956 u64 system_alloc_profile;
958 unsigned data_chunk_allocations;
959 unsigned metadata_ratio;
965 * in ram representation of the tree. extent_root is used for all allocations
966 * and for the extent tree extent_root root.
969 struct extent_buffer *node;
971 /* the node lock is held while changing the node pointer */
972 spinlock_t node_lock;
974 struct extent_buffer *commit_root;
975 struct btrfs_root *log_root;
976 struct btrfs_root *reloc_root;
978 struct btrfs_root_item root_item;
979 struct btrfs_key root_key;
980 struct btrfs_fs_info *fs_info;
981 struct extent_io_tree dirty_log_pages;
983 struct kobject root_kobj;
984 struct completion kobj_unregister;
985 struct mutex objectid_mutex;
987 struct mutex log_mutex;
988 wait_queue_head_t log_writer_wait;
989 wait_queue_head_t log_commit_wait[2];
990 atomic_t log_writers;
991 atomic_t log_commit[2];
992 unsigned long log_transid;
993 unsigned long log_batch;
998 /* data allocations are done in sectorsize units */
1001 /* node allocations are done in nodesize units */
1004 /* leaf allocations are done in leafsize units */
1011 u64 highest_objectid;
1014 u64 defrag_trans_start;
1015 struct btrfs_key defrag_progress;
1016 struct btrfs_key defrag_max;
1022 /* the dirty list is only used by non-reference counted roots */
1023 struct list_head dirty_list;
1025 struct list_head root_list;
1027 spinlock_t list_lock;
1028 struct list_head orphan_list;
1030 spinlock_t inode_lock;
1031 /* red-black tree that keeps track of in-memory inodes */
1032 struct rb_root inode_tree;
1035 * right now this just gets used so that a root has its own devid
1036 * for stat. It may be used for more later
1038 struct super_block anon_super;
1042 * inode items have the data typically returned from stat and store other
1043 * info about object characteristics. There is one for every file and dir in
1046 #define BTRFS_INODE_ITEM_KEY 1
1047 #define BTRFS_INODE_REF_KEY 12
1048 #define BTRFS_XATTR_ITEM_KEY 24
1049 #define BTRFS_ORPHAN_ITEM_KEY 48
1050 /* reserve 2-15 close to the inode for later flexibility */
1053 * dir items are the name -> inode pointers in a directory. There is one
1054 * for every name in a directory.
1056 #define BTRFS_DIR_LOG_ITEM_KEY 60
1057 #define BTRFS_DIR_LOG_INDEX_KEY 72
1058 #define BTRFS_DIR_ITEM_KEY 84
1059 #define BTRFS_DIR_INDEX_KEY 96
1061 * extent data is for file data
1063 #define BTRFS_EXTENT_DATA_KEY 108
1066 * extent csums are stored in a separate tree and hold csums for
1067 * an entire extent on disk.
1069 #define BTRFS_EXTENT_CSUM_KEY 128
1072 * root items point to tree roots. They are typically in the root
1073 * tree used by the super block to find all the other trees
1075 #define BTRFS_ROOT_ITEM_KEY 132
1078 * root backrefs tie subvols and snapshots to the directory entries that
1081 #define BTRFS_ROOT_BACKREF_KEY 144
1084 * root refs make a fast index for listing all of the snapshots and
1085 * subvolumes referenced by a given root. They point directly to the
1086 * directory item in the root that references the subvol
1088 #define BTRFS_ROOT_REF_KEY 156
1091 * extent items are in the extent map tree. These record which blocks
1092 * are used, and how many references there are to each block
1094 #define BTRFS_EXTENT_ITEM_KEY 168
1096 #define BTRFS_TREE_BLOCK_REF_KEY 176
1098 #define BTRFS_EXTENT_DATA_REF_KEY 178
1100 #define BTRFS_EXTENT_REF_V0_KEY 180
1102 #define BTRFS_SHARED_BLOCK_REF_KEY 182
1104 #define BTRFS_SHARED_DATA_REF_KEY 184
1107 * block groups give us hints into the extent allocation trees. Which
1108 * blocks are free etc etc
1110 #define BTRFS_BLOCK_GROUP_ITEM_KEY 192
1112 #define BTRFS_DEV_EXTENT_KEY 204
1113 #define BTRFS_DEV_ITEM_KEY 216
1114 #define BTRFS_CHUNK_ITEM_KEY 228
1117 * string items are for debugging. They just store a short string of
1120 #define BTRFS_STRING_ITEM_KEY 253
1122 #define BTRFS_MOUNT_NODATASUM (1 << 0)
1123 #define BTRFS_MOUNT_NODATACOW (1 << 1)
1124 #define BTRFS_MOUNT_NOBARRIER (1 << 2)
1125 #define BTRFS_MOUNT_SSD (1 << 3)
1126 #define BTRFS_MOUNT_DEGRADED (1 << 4)
1127 #define BTRFS_MOUNT_COMPRESS (1 << 5)
1128 #define BTRFS_MOUNT_NOTREELOG (1 << 6)
1129 #define BTRFS_MOUNT_FLUSHONCOMMIT (1 << 7)
1130 #define BTRFS_MOUNT_SSD_SPREAD (1 << 8)
1131 #define BTRFS_MOUNT_NOSSD (1 << 9)
1133 #define btrfs_clear_opt(o, opt) ((o) &= ~BTRFS_MOUNT_##opt)
1134 #define btrfs_set_opt(o, opt) ((o) |= BTRFS_MOUNT_##opt)
1135 #define btrfs_test_opt(root, opt) ((root)->fs_info->mount_opt & \
1140 #define BTRFS_INODE_NODATASUM (1 << 0)
1141 #define BTRFS_INODE_NODATACOW (1 << 1)
1142 #define BTRFS_INODE_READONLY (1 << 2)
1143 #define BTRFS_INODE_NOCOMPRESS (1 << 3)
1144 #define BTRFS_INODE_PREALLOC (1 << 4)
1145 #define BTRFS_INODE_SYNC (1 << 5)
1146 #define BTRFS_INODE_IMMUTABLE (1 << 6)
1147 #define BTRFS_INODE_APPEND (1 << 7)
1148 #define BTRFS_INODE_NODUMP (1 << 8)
1149 #define BTRFS_INODE_NOATIME (1 << 9)
1150 #define BTRFS_INODE_DIRSYNC (1 << 10)
1153 /* some macros to generate set/get funcs for the struct fields. This
1154 * assumes there is a lefoo_to_cpu for every type, so lets make a simple
1157 #define le8_to_cpu(v) (v)
1158 #define cpu_to_le8(v) (v)
1161 #define read_eb_member(eb, ptr, type, member, result) ( \
1162 read_extent_buffer(eb, (char *)(result), \
1163 ((unsigned long)(ptr)) + \
1164 offsetof(type, member), \
1165 sizeof(((type *)0)->member)))
1167 #define write_eb_member(eb, ptr, type, member, result) ( \
1168 write_extent_buffer(eb, (char *)(result), \
1169 ((unsigned long)(ptr)) + \
1170 offsetof(type, member), \
1171 sizeof(((type *)0)->member)))
1173 #ifndef BTRFS_SETGET_FUNCS
1174 #define BTRFS_SETGET_FUNCS(name, type, member, bits) \
1175 u##bits btrfs_##name(struct extent_buffer *eb, type *s); \
1176 void btrfs_set_##name(struct extent_buffer *eb, type *s, u##bits val);
1179 #define BTRFS_SETGET_HEADER_FUNCS(name, type, member, bits) \
1180 static inline u##bits btrfs_##name(struct extent_buffer *eb) \
1182 type *p = kmap_atomic(eb->first_page, KM_USER0); \
1183 u##bits res = le##bits##_to_cpu(p->member); \
1184 kunmap_atomic(p, KM_USER0); \
1187 static inline void btrfs_set_##name(struct extent_buffer *eb, \
1190 type *p = kmap_atomic(eb->first_page, KM_USER0); \
1191 p->member = cpu_to_le##bits(val); \
1192 kunmap_atomic(p, KM_USER0); \
1195 #define BTRFS_SETGET_STACK_FUNCS(name, type, member, bits) \
1196 static inline u##bits btrfs_##name(type *s) \
1198 return le##bits##_to_cpu(s->member); \
1200 static inline void btrfs_set_##name(type *s, u##bits val) \
1202 s->member = cpu_to_le##bits(val); \
1205 BTRFS_SETGET_FUNCS(device_type, struct btrfs_dev_item, type, 64);
1206 BTRFS_SETGET_FUNCS(device_total_bytes, struct btrfs_dev_item, total_bytes, 64);
1207 BTRFS_SETGET_FUNCS(device_bytes_used, struct btrfs_dev_item, bytes_used, 64);
1208 BTRFS_SETGET_FUNCS(device_io_align, struct btrfs_dev_item, io_align, 32);
1209 BTRFS_SETGET_FUNCS(device_io_width, struct btrfs_dev_item, io_width, 32);
1210 BTRFS_SETGET_FUNCS(device_start_offset, struct btrfs_dev_item,
1212 BTRFS_SETGET_FUNCS(device_sector_size, struct btrfs_dev_item, sector_size, 32);
1213 BTRFS_SETGET_FUNCS(device_id, struct btrfs_dev_item, devid, 64);
1214 BTRFS_SETGET_FUNCS(device_group, struct btrfs_dev_item, dev_group, 32);
1215 BTRFS_SETGET_FUNCS(device_seek_speed, struct btrfs_dev_item, seek_speed, 8);
1216 BTRFS_SETGET_FUNCS(device_bandwidth, struct btrfs_dev_item, bandwidth, 8);
1217 BTRFS_SETGET_FUNCS(device_generation, struct btrfs_dev_item, generation, 64);
1219 BTRFS_SETGET_STACK_FUNCS(stack_device_type, struct btrfs_dev_item, type, 64);
1220 BTRFS_SETGET_STACK_FUNCS(stack_device_total_bytes, struct btrfs_dev_item,
1222 BTRFS_SETGET_STACK_FUNCS(stack_device_bytes_used, struct btrfs_dev_item,
1224 BTRFS_SETGET_STACK_FUNCS(stack_device_io_align, struct btrfs_dev_item,
1226 BTRFS_SETGET_STACK_FUNCS(stack_device_io_width, struct btrfs_dev_item,
1228 BTRFS_SETGET_STACK_FUNCS(stack_device_sector_size, struct btrfs_dev_item,
1230 BTRFS_SETGET_STACK_FUNCS(stack_device_id, struct btrfs_dev_item, devid, 64);
1231 BTRFS_SETGET_STACK_FUNCS(stack_device_group, struct btrfs_dev_item,
1233 BTRFS_SETGET_STACK_FUNCS(stack_device_seek_speed, struct btrfs_dev_item,
1235 BTRFS_SETGET_STACK_FUNCS(stack_device_bandwidth, struct btrfs_dev_item,
1237 BTRFS_SETGET_STACK_FUNCS(stack_device_generation, struct btrfs_dev_item,
1240 static inline char *btrfs_device_uuid(struct btrfs_dev_item *d)
1242 return (char *)d + offsetof(struct btrfs_dev_item, uuid);
1245 static inline char *btrfs_device_fsid(struct btrfs_dev_item *d)
1247 return (char *)d + offsetof(struct btrfs_dev_item, fsid);
1250 BTRFS_SETGET_FUNCS(chunk_length, struct btrfs_chunk, length, 64);
1251 BTRFS_SETGET_FUNCS(chunk_owner, struct btrfs_chunk, owner, 64);
1252 BTRFS_SETGET_FUNCS(chunk_stripe_len, struct btrfs_chunk, stripe_len, 64);
1253 BTRFS_SETGET_FUNCS(chunk_io_align, struct btrfs_chunk, io_align, 32);
1254 BTRFS_SETGET_FUNCS(chunk_io_width, struct btrfs_chunk, io_width, 32);
1255 BTRFS_SETGET_FUNCS(chunk_sector_size, struct btrfs_chunk, sector_size, 32);
1256 BTRFS_SETGET_FUNCS(chunk_type, struct btrfs_chunk, type, 64);
1257 BTRFS_SETGET_FUNCS(chunk_num_stripes, struct btrfs_chunk, num_stripes, 16);
1258 BTRFS_SETGET_FUNCS(chunk_sub_stripes, struct btrfs_chunk, sub_stripes, 16);
1259 BTRFS_SETGET_FUNCS(stripe_devid, struct btrfs_stripe, devid, 64);
1260 BTRFS_SETGET_FUNCS(stripe_offset, struct btrfs_stripe, offset, 64);
1262 static inline char *btrfs_stripe_dev_uuid(struct btrfs_stripe *s)
1264 return (char *)s + offsetof(struct btrfs_stripe, dev_uuid);
1267 BTRFS_SETGET_STACK_FUNCS(stack_chunk_length, struct btrfs_chunk, length, 64);
1268 BTRFS_SETGET_STACK_FUNCS(stack_chunk_owner, struct btrfs_chunk, owner, 64);
1269 BTRFS_SETGET_STACK_FUNCS(stack_chunk_stripe_len, struct btrfs_chunk,
1271 BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_align, struct btrfs_chunk,
1273 BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_width, struct btrfs_chunk,
1275 BTRFS_SETGET_STACK_FUNCS(stack_chunk_sector_size, struct btrfs_chunk,
1277 BTRFS_SETGET_STACK_FUNCS(stack_chunk_type, struct btrfs_chunk, type, 64);
1278 BTRFS_SETGET_STACK_FUNCS(stack_chunk_num_stripes, struct btrfs_chunk,
1280 BTRFS_SETGET_STACK_FUNCS(stack_chunk_sub_stripes, struct btrfs_chunk,
1282 BTRFS_SETGET_STACK_FUNCS(stack_stripe_devid, struct btrfs_stripe, devid, 64);
1283 BTRFS_SETGET_STACK_FUNCS(stack_stripe_offset, struct btrfs_stripe, offset, 64);
1285 static inline struct btrfs_stripe *btrfs_stripe_nr(struct btrfs_chunk *c,
1288 unsigned long offset = (unsigned long)c;
1289 offset += offsetof(struct btrfs_chunk, stripe);
1290 offset += nr * sizeof(struct btrfs_stripe);
1291 return (struct btrfs_stripe *)offset;
1294 static inline char *btrfs_stripe_dev_uuid_nr(struct btrfs_chunk *c, int nr)
1296 return btrfs_stripe_dev_uuid(btrfs_stripe_nr(c, nr));
1299 static inline u64 btrfs_stripe_offset_nr(struct extent_buffer *eb,
1300 struct btrfs_chunk *c, int nr)
1302 return btrfs_stripe_offset(eb, btrfs_stripe_nr(c, nr));
1305 static inline void btrfs_set_stripe_offset_nr(struct extent_buffer *eb,
1306 struct btrfs_chunk *c, int nr,
1309 btrfs_set_stripe_offset(eb, btrfs_stripe_nr(c, nr), val);
1312 static inline u64 btrfs_stripe_devid_nr(struct extent_buffer *eb,
1313 struct btrfs_chunk *c, int nr)
1315 return btrfs_stripe_devid(eb, btrfs_stripe_nr(c, nr));
1318 static inline void btrfs_set_stripe_devid_nr(struct extent_buffer *eb,
1319 struct btrfs_chunk *c, int nr,
1322 btrfs_set_stripe_devid(eb, btrfs_stripe_nr(c, nr), val);
1325 /* struct btrfs_block_group_item */
1326 BTRFS_SETGET_STACK_FUNCS(block_group_used, struct btrfs_block_group_item,
1328 BTRFS_SETGET_FUNCS(disk_block_group_used, struct btrfs_block_group_item,
1330 BTRFS_SETGET_STACK_FUNCS(block_group_chunk_objectid,
1331 struct btrfs_block_group_item, chunk_objectid, 64);
1333 BTRFS_SETGET_FUNCS(disk_block_group_chunk_objectid,
1334 struct btrfs_block_group_item, chunk_objectid, 64);
1335 BTRFS_SETGET_FUNCS(disk_block_group_flags,
1336 struct btrfs_block_group_item, flags, 64);
1337 BTRFS_SETGET_STACK_FUNCS(block_group_flags,
1338 struct btrfs_block_group_item, flags, 64);
1340 /* struct btrfs_inode_ref */
1341 BTRFS_SETGET_FUNCS(inode_ref_name_len, struct btrfs_inode_ref, name_len, 16);
1342 BTRFS_SETGET_FUNCS(inode_ref_index, struct btrfs_inode_ref, index, 64);
1344 /* struct btrfs_inode_item */
1345 BTRFS_SETGET_FUNCS(inode_generation, struct btrfs_inode_item, generation, 64);
1346 BTRFS_SETGET_FUNCS(inode_sequence, struct btrfs_inode_item, sequence, 64);
1347 BTRFS_SETGET_FUNCS(inode_transid, struct btrfs_inode_item, transid, 64);
1348 BTRFS_SETGET_FUNCS(inode_size, struct btrfs_inode_item, size, 64);
1349 BTRFS_SETGET_FUNCS(inode_nbytes, struct btrfs_inode_item, nbytes, 64);
1350 BTRFS_SETGET_FUNCS(inode_block_group, struct btrfs_inode_item, block_group, 64);
1351 BTRFS_SETGET_FUNCS(inode_nlink, struct btrfs_inode_item, nlink, 32);
1352 BTRFS_SETGET_FUNCS(inode_uid, struct btrfs_inode_item, uid, 32);
1353 BTRFS_SETGET_FUNCS(inode_gid, struct btrfs_inode_item, gid, 32);
1354 BTRFS_SETGET_FUNCS(inode_mode, struct btrfs_inode_item, mode, 32);
1355 BTRFS_SETGET_FUNCS(inode_rdev, struct btrfs_inode_item, rdev, 64);
1356 BTRFS_SETGET_FUNCS(inode_flags, struct btrfs_inode_item, flags, 64);
1358 static inline struct btrfs_timespec *
1359 btrfs_inode_atime(struct btrfs_inode_item *inode_item)
1361 unsigned long ptr = (unsigned long)inode_item;
1362 ptr += offsetof(struct btrfs_inode_item, atime);
1363 return (struct btrfs_timespec *)ptr;
1366 static inline struct btrfs_timespec *
1367 btrfs_inode_mtime(struct btrfs_inode_item *inode_item)
1369 unsigned long ptr = (unsigned long)inode_item;
1370 ptr += offsetof(struct btrfs_inode_item, mtime);
1371 return (struct btrfs_timespec *)ptr;
1374 static inline struct btrfs_timespec *
1375 btrfs_inode_ctime(struct btrfs_inode_item *inode_item)
1377 unsigned long ptr = (unsigned long)inode_item;
1378 ptr += offsetof(struct btrfs_inode_item, ctime);
1379 return (struct btrfs_timespec *)ptr;
1382 static inline struct btrfs_timespec *
1383 btrfs_inode_otime(struct btrfs_inode_item *inode_item)
1385 unsigned long ptr = (unsigned long)inode_item;
1386 ptr += offsetof(struct btrfs_inode_item, otime);
1387 return (struct btrfs_timespec *)ptr;
1390 BTRFS_SETGET_FUNCS(timespec_sec, struct btrfs_timespec, sec, 64);
1391 BTRFS_SETGET_FUNCS(timespec_nsec, struct btrfs_timespec, nsec, 32);
1393 /* struct btrfs_dev_extent */
1394 BTRFS_SETGET_FUNCS(dev_extent_chunk_tree, struct btrfs_dev_extent,
1396 BTRFS_SETGET_FUNCS(dev_extent_chunk_objectid, struct btrfs_dev_extent,
1397 chunk_objectid, 64);
1398 BTRFS_SETGET_FUNCS(dev_extent_chunk_offset, struct btrfs_dev_extent,
1400 BTRFS_SETGET_FUNCS(dev_extent_length, struct btrfs_dev_extent, length, 64);
1402 static inline u8 *btrfs_dev_extent_chunk_tree_uuid(struct btrfs_dev_extent *dev)
1404 unsigned long ptr = offsetof(struct btrfs_dev_extent, chunk_tree_uuid);
1405 return (u8 *)((unsigned long)dev + ptr);
1408 BTRFS_SETGET_FUNCS(extent_refs, struct btrfs_extent_item, refs, 64);
1409 BTRFS_SETGET_FUNCS(extent_generation, struct btrfs_extent_item,
1411 BTRFS_SETGET_FUNCS(extent_flags, struct btrfs_extent_item, flags, 64);
1413 BTRFS_SETGET_FUNCS(extent_refs_v0, struct btrfs_extent_item_v0, refs, 32);
1416 BTRFS_SETGET_FUNCS(tree_block_level, struct btrfs_tree_block_info, level, 8);
1418 static inline void btrfs_tree_block_key(struct extent_buffer *eb,
1419 struct btrfs_tree_block_info *item,
1420 struct btrfs_disk_key *key)
1422 read_eb_member(eb, item, struct btrfs_tree_block_info, key, key);
1425 static inline void btrfs_set_tree_block_key(struct extent_buffer *eb,
1426 struct btrfs_tree_block_info *item,
1427 struct btrfs_disk_key *key)
1429 write_eb_member(eb, item, struct btrfs_tree_block_info, key, key);
1432 BTRFS_SETGET_FUNCS(extent_data_ref_root, struct btrfs_extent_data_ref,
1434 BTRFS_SETGET_FUNCS(extent_data_ref_objectid, struct btrfs_extent_data_ref,
1436 BTRFS_SETGET_FUNCS(extent_data_ref_offset, struct btrfs_extent_data_ref,
1438 BTRFS_SETGET_FUNCS(extent_data_ref_count, struct btrfs_extent_data_ref,
1441 BTRFS_SETGET_FUNCS(shared_data_ref_count, struct btrfs_shared_data_ref,
1444 BTRFS_SETGET_FUNCS(extent_inline_ref_type, struct btrfs_extent_inline_ref,
1446 BTRFS_SETGET_FUNCS(extent_inline_ref_offset, struct btrfs_extent_inline_ref,
1449 static inline u32 btrfs_extent_inline_ref_size(int type)
1451 if (type == BTRFS_TREE_BLOCK_REF_KEY ||
1452 type == BTRFS_SHARED_BLOCK_REF_KEY)
1453 return sizeof(struct btrfs_extent_inline_ref);
1454 if (type == BTRFS_SHARED_DATA_REF_KEY)
1455 return sizeof(struct btrfs_shared_data_ref) +
1456 sizeof(struct btrfs_extent_inline_ref);
1457 if (type == BTRFS_EXTENT_DATA_REF_KEY)
1458 return sizeof(struct btrfs_extent_data_ref) +
1459 offsetof(struct btrfs_extent_inline_ref, offset);
1464 BTRFS_SETGET_FUNCS(ref_root_v0, struct btrfs_extent_ref_v0, root, 64);
1465 BTRFS_SETGET_FUNCS(ref_generation_v0, struct btrfs_extent_ref_v0,
1467 BTRFS_SETGET_FUNCS(ref_objectid_v0, struct btrfs_extent_ref_v0, objectid, 64);
1468 BTRFS_SETGET_FUNCS(ref_count_v0, struct btrfs_extent_ref_v0, count, 32);
1470 /* struct btrfs_node */
1471 BTRFS_SETGET_FUNCS(key_blockptr, struct btrfs_key_ptr, blockptr, 64);
1472 BTRFS_SETGET_FUNCS(key_generation, struct btrfs_key_ptr, generation, 64);
1474 static inline u64 btrfs_node_blockptr(struct extent_buffer *eb, int nr)
1477 ptr = offsetof(struct btrfs_node, ptrs) +
1478 sizeof(struct btrfs_key_ptr) * nr;
1479 return btrfs_key_blockptr(eb, (struct btrfs_key_ptr *)ptr);
1482 static inline void btrfs_set_node_blockptr(struct extent_buffer *eb,
1486 ptr = offsetof(struct btrfs_node, ptrs) +
1487 sizeof(struct btrfs_key_ptr) * nr;
1488 btrfs_set_key_blockptr(eb, (struct btrfs_key_ptr *)ptr, val);
1491 static inline u64 btrfs_node_ptr_generation(struct extent_buffer *eb, int nr)
1494 ptr = offsetof(struct btrfs_node, ptrs) +
1495 sizeof(struct btrfs_key_ptr) * nr;
1496 return btrfs_key_generation(eb, (struct btrfs_key_ptr *)ptr);
1499 static inline void btrfs_set_node_ptr_generation(struct extent_buffer *eb,
1503 ptr = offsetof(struct btrfs_node, ptrs) +
1504 sizeof(struct btrfs_key_ptr) * nr;
1505 btrfs_set_key_generation(eb, (struct btrfs_key_ptr *)ptr, val);
1508 static inline unsigned long btrfs_node_key_ptr_offset(int nr)
1510 return offsetof(struct btrfs_node, ptrs) +
1511 sizeof(struct btrfs_key_ptr) * nr;
1514 void btrfs_node_key(struct extent_buffer *eb,
1515 struct btrfs_disk_key *disk_key, int nr);
1517 static inline void btrfs_set_node_key(struct extent_buffer *eb,
1518 struct btrfs_disk_key *disk_key, int nr)
1521 ptr = btrfs_node_key_ptr_offset(nr);
1522 write_eb_member(eb, (struct btrfs_key_ptr *)ptr,
1523 struct btrfs_key_ptr, key, disk_key);
1526 /* struct btrfs_item */
1527 BTRFS_SETGET_FUNCS(item_offset, struct btrfs_item, offset, 32);
1528 BTRFS_SETGET_FUNCS(item_size, struct btrfs_item, size, 32);
1530 static inline unsigned long btrfs_item_nr_offset(int nr)
1532 return offsetof(struct btrfs_leaf, items) +
1533 sizeof(struct btrfs_item) * nr;
1536 static inline struct btrfs_item *btrfs_item_nr(struct extent_buffer *eb,
1539 return (struct btrfs_item *)btrfs_item_nr_offset(nr);
1542 static inline u32 btrfs_item_end(struct extent_buffer *eb,
1543 struct btrfs_item *item)
1545 return btrfs_item_offset(eb, item) + btrfs_item_size(eb, item);
1548 static inline u32 btrfs_item_end_nr(struct extent_buffer *eb, int nr)
1550 return btrfs_item_end(eb, btrfs_item_nr(eb, nr));
1553 static inline u32 btrfs_item_offset_nr(struct extent_buffer *eb, int nr)
1555 return btrfs_item_offset(eb, btrfs_item_nr(eb, nr));
1558 static inline u32 btrfs_item_size_nr(struct extent_buffer *eb, int nr)
1560 return btrfs_item_size(eb, btrfs_item_nr(eb, nr));
1563 static inline void btrfs_item_key(struct extent_buffer *eb,
1564 struct btrfs_disk_key *disk_key, int nr)
1566 struct btrfs_item *item = btrfs_item_nr(eb, nr);
1567 read_eb_member(eb, item, struct btrfs_item, key, disk_key);
1570 static inline void btrfs_set_item_key(struct extent_buffer *eb,
1571 struct btrfs_disk_key *disk_key, int nr)
1573 struct btrfs_item *item = btrfs_item_nr(eb, nr);
1574 write_eb_member(eb, item, struct btrfs_item, key, disk_key);
1577 BTRFS_SETGET_FUNCS(dir_log_end, struct btrfs_dir_log_item, end, 64);
1580 * struct btrfs_root_ref
1582 BTRFS_SETGET_FUNCS(root_ref_dirid, struct btrfs_root_ref, dirid, 64);
1583 BTRFS_SETGET_FUNCS(root_ref_sequence, struct btrfs_root_ref, sequence, 64);
1584 BTRFS_SETGET_FUNCS(root_ref_name_len, struct btrfs_root_ref, name_len, 16);
1586 /* struct btrfs_dir_item */
1587 BTRFS_SETGET_FUNCS(dir_data_len, struct btrfs_dir_item, data_len, 16);
1588 BTRFS_SETGET_FUNCS(dir_type, struct btrfs_dir_item, type, 8);
1589 BTRFS_SETGET_FUNCS(dir_name_len, struct btrfs_dir_item, name_len, 16);
1590 BTRFS_SETGET_FUNCS(dir_transid, struct btrfs_dir_item, transid, 64);
1592 static inline void btrfs_dir_item_key(struct extent_buffer *eb,
1593 struct btrfs_dir_item *item,
1594 struct btrfs_disk_key *key)
1596 read_eb_member(eb, item, struct btrfs_dir_item, location, key);
1599 static inline void btrfs_set_dir_item_key(struct extent_buffer *eb,
1600 struct btrfs_dir_item *item,
1601 struct btrfs_disk_key *key)
1603 write_eb_member(eb, item, struct btrfs_dir_item, location, key);
1606 /* struct btrfs_disk_key */
1607 BTRFS_SETGET_STACK_FUNCS(disk_key_objectid, struct btrfs_disk_key,
1609 BTRFS_SETGET_STACK_FUNCS(disk_key_offset, struct btrfs_disk_key, offset, 64);
1610 BTRFS_SETGET_STACK_FUNCS(disk_key_type, struct btrfs_disk_key, type, 8);
1612 static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu,
1613 struct btrfs_disk_key *disk)
1615 cpu->offset = le64_to_cpu(disk->offset);
1616 cpu->type = disk->type;
1617 cpu->objectid = le64_to_cpu(disk->objectid);
1620 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk,
1621 struct btrfs_key *cpu)
1623 disk->offset = cpu_to_le64(cpu->offset);
1624 disk->type = cpu->type;
1625 disk->objectid = cpu_to_le64(cpu->objectid);
1628 static inline void btrfs_node_key_to_cpu(struct extent_buffer *eb,
1629 struct btrfs_key *key, int nr)
1631 struct btrfs_disk_key disk_key;
1632 btrfs_node_key(eb, &disk_key, nr);
1633 btrfs_disk_key_to_cpu(key, &disk_key);
1636 static inline void btrfs_item_key_to_cpu(struct extent_buffer *eb,
1637 struct btrfs_key *key, int nr)
1639 struct btrfs_disk_key disk_key;
1640 btrfs_item_key(eb, &disk_key, nr);
1641 btrfs_disk_key_to_cpu(key, &disk_key);
1644 static inline void btrfs_dir_item_key_to_cpu(struct extent_buffer *eb,
1645 struct btrfs_dir_item *item,
1646 struct btrfs_key *key)
1648 struct btrfs_disk_key disk_key;
1649 btrfs_dir_item_key(eb, item, &disk_key);
1650 btrfs_disk_key_to_cpu(key, &disk_key);
1654 static inline u8 btrfs_key_type(struct btrfs_key *key)
1659 static inline void btrfs_set_key_type(struct btrfs_key *key, u8 val)
1664 /* struct btrfs_header */
1665 BTRFS_SETGET_HEADER_FUNCS(header_bytenr, struct btrfs_header, bytenr, 64);
1666 BTRFS_SETGET_HEADER_FUNCS(header_generation, struct btrfs_header,
1668 BTRFS_SETGET_HEADER_FUNCS(header_owner, struct btrfs_header, owner, 64);
1669 BTRFS_SETGET_HEADER_FUNCS(header_nritems, struct btrfs_header, nritems, 32);
1670 BTRFS_SETGET_HEADER_FUNCS(header_flags, struct btrfs_header, flags, 64);
1671 BTRFS_SETGET_HEADER_FUNCS(header_level, struct btrfs_header, level, 8);
1673 static inline int btrfs_header_flag(struct extent_buffer *eb, u64 flag)
1675 return (btrfs_header_flags(eb) & flag) == flag;
1678 static inline int btrfs_set_header_flag(struct extent_buffer *eb, u64 flag)
1680 u64 flags = btrfs_header_flags(eb);
1681 btrfs_set_header_flags(eb, flags | flag);
1682 return (flags & flag) == flag;
1685 static inline int btrfs_clear_header_flag(struct extent_buffer *eb, u64 flag)
1687 u64 flags = btrfs_header_flags(eb);
1688 btrfs_set_header_flags(eb, flags & ~flag);
1689 return (flags & flag) == flag;
1692 static inline int btrfs_header_backref_rev(struct extent_buffer *eb)
1694 u64 flags = btrfs_header_flags(eb);
1695 return flags >> BTRFS_BACKREF_REV_SHIFT;
1698 static inline void btrfs_set_header_backref_rev(struct extent_buffer *eb,
1701 u64 flags = btrfs_header_flags(eb);
1702 flags &= ~BTRFS_BACKREF_REV_MASK;
1703 flags |= (u64)rev << BTRFS_BACKREF_REV_SHIFT;
1704 btrfs_set_header_flags(eb, flags);
1707 static inline u8 *btrfs_header_fsid(struct extent_buffer *eb)
1709 unsigned long ptr = offsetof(struct btrfs_header, fsid);
1713 static inline u8 *btrfs_header_chunk_tree_uuid(struct extent_buffer *eb)
1715 unsigned long ptr = offsetof(struct btrfs_header, chunk_tree_uuid);
1719 static inline u8 *btrfs_super_fsid(struct extent_buffer *eb)
1721 unsigned long ptr = offsetof(struct btrfs_super_block, fsid);
1725 static inline u8 *btrfs_header_csum(struct extent_buffer *eb)
1727 unsigned long ptr = offsetof(struct btrfs_header, csum);
1731 static inline struct btrfs_node *btrfs_buffer_node(struct extent_buffer *eb)
1736 static inline struct btrfs_leaf *btrfs_buffer_leaf(struct extent_buffer *eb)
1741 static inline struct btrfs_header *btrfs_buffer_header(struct extent_buffer *eb)
1746 static inline int btrfs_is_leaf(struct extent_buffer *eb)
1748 return btrfs_header_level(eb) == 0;
1751 /* struct btrfs_root_item */
1752 BTRFS_SETGET_FUNCS(disk_root_generation, struct btrfs_root_item,
1754 BTRFS_SETGET_FUNCS(disk_root_refs, struct btrfs_root_item, refs, 32);
1755 BTRFS_SETGET_FUNCS(disk_root_bytenr, struct btrfs_root_item, bytenr, 64);
1756 BTRFS_SETGET_FUNCS(disk_root_level, struct btrfs_root_item, level, 8);
1758 BTRFS_SETGET_STACK_FUNCS(root_generation, struct btrfs_root_item,
1760 BTRFS_SETGET_STACK_FUNCS(root_bytenr, struct btrfs_root_item, bytenr, 64);
1761 BTRFS_SETGET_STACK_FUNCS(root_level, struct btrfs_root_item, level, 8);
1762 BTRFS_SETGET_STACK_FUNCS(root_dirid, struct btrfs_root_item, root_dirid, 64);
1763 BTRFS_SETGET_STACK_FUNCS(root_refs, struct btrfs_root_item, refs, 32);
1764 BTRFS_SETGET_STACK_FUNCS(root_flags, struct btrfs_root_item, flags, 64);
1765 BTRFS_SETGET_STACK_FUNCS(root_used, struct btrfs_root_item, bytes_used, 64);
1766 BTRFS_SETGET_STACK_FUNCS(root_limit, struct btrfs_root_item, byte_limit, 64);
1767 BTRFS_SETGET_STACK_FUNCS(root_last_snapshot, struct btrfs_root_item,
1770 /* struct btrfs_super_block */
1772 BTRFS_SETGET_STACK_FUNCS(super_bytenr, struct btrfs_super_block, bytenr, 64);
1773 BTRFS_SETGET_STACK_FUNCS(super_flags, struct btrfs_super_block, flags, 64);
1774 BTRFS_SETGET_STACK_FUNCS(super_generation, struct btrfs_super_block,
1776 BTRFS_SETGET_STACK_FUNCS(super_root, struct btrfs_super_block, root, 64);
1777 BTRFS_SETGET_STACK_FUNCS(super_sys_array_size,
1778 struct btrfs_super_block, sys_chunk_array_size, 32);
1779 BTRFS_SETGET_STACK_FUNCS(super_chunk_root_generation,
1780 struct btrfs_super_block, chunk_root_generation, 64);
1781 BTRFS_SETGET_STACK_FUNCS(super_root_level, struct btrfs_super_block,
1783 BTRFS_SETGET_STACK_FUNCS(super_chunk_root, struct btrfs_super_block,
1785 BTRFS_SETGET_STACK_FUNCS(super_chunk_root_level, struct btrfs_super_block,
1786 chunk_root_level, 8);
1787 BTRFS_SETGET_STACK_FUNCS(super_log_root, struct btrfs_super_block,
1789 BTRFS_SETGET_STACK_FUNCS(super_log_root_transid, struct btrfs_super_block,
1790 log_root_transid, 64);
1791 BTRFS_SETGET_STACK_FUNCS(super_log_root_level, struct btrfs_super_block,
1793 BTRFS_SETGET_STACK_FUNCS(super_total_bytes, struct btrfs_super_block,
1795 BTRFS_SETGET_STACK_FUNCS(super_bytes_used, struct btrfs_super_block,
1797 BTRFS_SETGET_STACK_FUNCS(super_sectorsize, struct btrfs_super_block,
1799 BTRFS_SETGET_STACK_FUNCS(super_nodesize, struct btrfs_super_block,
1801 BTRFS_SETGET_STACK_FUNCS(super_leafsize, struct btrfs_super_block,
1803 BTRFS_SETGET_STACK_FUNCS(super_stripesize, struct btrfs_super_block,
1805 BTRFS_SETGET_STACK_FUNCS(super_root_dir, struct btrfs_super_block,
1806 root_dir_objectid, 64);
1807 BTRFS_SETGET_STACK_FUNCS(super_num_devices, struct btrfs_super_block,
1809 BTRFS_SETGET_STACK_FUNCS(super_compat_flags, struct btrfs_super_block,
1811 BTRFS_SETGET_STACK_FUNCS(super_compat_ro_flags, struct btrfs_super_block,
1813 BTRFS_SETGET_STACK_FUNCS(super_incompat_flags, struct btrfs_super_block,
1814 incompat_flags, 64);
1815 BTRFS_SETGET_STACK_FUNCS(super_csum_type, struct btrfs_super_block,
1818 static inline int btrfs_super_csum_size(struct btrfs_super_block *s)
1820 int t = btrfs_super_csum_type(s);
1821 BUG_ON(t >= ARRAY_SIZE(btrfs_csum_sizes));
1822 return btrfs_csum_sizes[t];
1825 static inline unsigned long btrfs_leaf_data(struct extent_buffer *l)
1827 return offsetof(struct btrfs_leaf, items);
1830 /* struct btrfs_file_extent_item */
1831 BTRFS_SETGET_FUNCS(file_extent_type, struct btrfs_file_extent_item, type, 8);
1833 static inline unsigned long
1834 btrfs_file_extent_inline_start(struct btrfs_file_extent_item *e)
1836 unsigned long offset = (unsigned long)e;
1837 offset += offsetof(struct btrfs_file_extent_item, disk_bytenr);
1841 static inline u32 btrfs_file_extent_calc_inline_size(u32 datasize)
1843 return offsetof(struct btrfs_file_extent_item, disk_bytenr) + datasize;
1846 BTRFS_SETGET_FUNCS(file_extent_disk_bytenr, struct btrfs_file_extent_item,
1848 BTRFS_SETGET_FUNCS(file_extent_generation, struct btrfs_file_extent_item,
1850 BTRFS_SETGET_FUNCS(file_extent_disk_num_bytes, struct btrfs_file_extent_item,
1851 disk_num_bytes, 64);
1852 BTRFS_SETGET_FUNCS(file_extent_offset, struct btrfs_file_extent_item,
1854 BTRFS_SETGET_FUNCS(file_extent_num_bytes, struct btrfs_file_extent_item,
1856 BTRFS_SETGET_FUNCS(file_extent_ram_bytes, struct btrfs_file_extent_item,
1858 BTRFS_SETGET_FUNCS(file_extent_compression, struct btrfs_file_extent_item,
1860 BTRFS_SETGET_FUNCS(file_extent_encryption, struct btrfs_file_extent_item,
1862 BTRFS_SETGET_FUNCS(file_extent_other_encoding, struct btrfs_file_extent_item,
1863 other_encoding, 16);
1865 /* this returns the number of file bytes represented by the inline item.
1866 * If an item is compressed, this is the uncompressed size
1868 static inline u32 btrfs_file_extent_inline_len(struct extent_buffer *eb,
1869 struct btrfs_file_extent_item *e)
1871 return btrfs_file_extent_ram_bytes(eb, e);
1875 * this returns the number of bytes used by the item on disk, minus the
1876 * size of any extent headers. If a file is compressed on disk, this is
1877 * the compressed size
1879 static inline u32 btrfs_file_extent_inline_item_len(struct extent_buffer *eb,
1880 struct btrfs_item *e)
1882 unsigned long offset;
1883 offset = offsetof(struct btrfs_file_extent_item, disk_bytenr);
1884 return btrfs_item_size(eb, e) - offset;
1887 static inline struct btrfs_root *btrfs_sb(struct super_block *sb)
1889 return sb->s_fs_info;
1892 static inline int btrfs_set_root_name(struct btrfs_root *root,
1893 const char *name, int len)
1895 /* if we already have a name just free it */
1898 root->name = kmalloc(len+1, GFP_KERNEL);
1902 memcpy(root->name, name, len);
1903 root->name[len] = '\0';
1908 static inline u32 btrfs_level_size(struct btrfs_root *root, int level)
1911 return root->leafsize;
1912 return root->nodesize;
1915 /* helper function to cast into the data area of the leaf. */
1916 #define btrfs_item_ptr(leaf, slot, type) \
1917 ((type *)(btrfs_leaf_data(leaf) + \
1918 btrfs_item_offset_nr(leaf, slot)))
1920 #define btrfs_item_ptr_offset(leaf, slot) \
1921 ((unsigned long)(btrfs_leaf_data(leaf) + \
1922 btrfs_item_offset_nr(leaf, slot)))
1924 static inline struct dentry *fdentry(struct file *file)
1926 return file->f_path.dentry;
1930 void btrfs_put_block_group(struct btrfs_block_group_cache *cache);
1931 int btrfs_run_delayed_refs(struct btrfs_trans_handle *trans,
1932 struct btrfs_root *root, unsigned long count);
1933 int btrfs_lookup_extent(struct btrfs_root *root, u64 start, u64 len);
1934 int btrfs_pin_extent(struct btrfs_root *root,
1935 u64 bytenr, u64 num, int reserved);
1936 int btrfs_drop_leaf_ref(struct btrfs_trans_handle *trans,
1937 struct btrfs_root *root, struct extent_buffer *leaf);
1938 int btrfs_cross_ref_exist(struct btrfs_trans_handle *trans,
1939 struct btrfs_root *root,
1940 u64 objectid, u64 offset, u64 bytenr);
1941 int btrfs_copy_pinned(struct btrfs_root *root, struct extent_io_tree *copy);
1942 struct btrfs_block_group_cache *btrfs_lookup_block_group(
1943 struct btrfs_fs_info *info,
1945 void btrfs_put_block_group(struct btrfs_block_group_cache *cache);
1946 u64 btrfs_find_block_group(struct btrfs_root *root,
1947 u64 search_start, u64 search_hint, int owner);
1948 struct extent_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
1949 struct btrfs_root *root, u32 blocksize,
1950 u64 parent, u64 root_objectid,
1951 struct btrfs_disk_key *key, int level,
1952 u64 hint, u64 empty_size);
1953 struct extent_buffer *btrfs_init_new_buffer(struct btrfs_trans_handle *trans,
1954 struct btrfs_root *root,
1955 u64 bytenr, u32 blocksize,
1957 int btrfs_alloc_reserved_file_extent(struct btrfs_trans_handle *trans,
1958 struct btrfs_root *root,
1959 u64 root_objectid, u64 owner,
1960 u64 offset, struct btrfs_key *ins);
1961 int btrfs_alloc_logged_file_extent(struct btrfs_trans_handle *trans,
1962 struct btrfs_root *root,
1963 u64 root_objectid, u64 owner, u64 offset,
1964 struct btrfs_key *ins);
1965 int btrfs_reserve_extent(struct btrfs_trans_handle *trans,
1966 struct btrfs_root *root,
1967 u64 num_bytes, u64 min_alloc_size,
1968 u64 empty_size, u64 hint_byte,
1969 u64 search_end, struct btrfs_key *ins,
1971 int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1972 struct extent_buffer *buf, int full_backref);
1973 int btrfs_dec_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1974 struct extent_buffer *buf, int full_backref);
1975 int btrfs_set_disk_extent_flags(struct btrfs_trans_handle *trans,
1976 struct btrfs_root *root,
1977 u64 bytenr, u64 num_bytes, u64 flags,
1979 int btrfs_free_extent(struct btrfs_trans_handle *trans,
1980 struct btrfs_root *root,
1981 u64 bytenr, u64 num_bytes, u64 parent,
1982 u64 root_objectid, u64 owner, u64 offset);
1984 int btrfs_free_reserved_extent(struct btrfs_root *root, u64 start, u64 len);
1985 int btrfs_prepare_extent_commit(struct btrfs_trans_handle *trans,
1986 struct btrfs_root *root);
1987 int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans,
1988 struct btrfs_root *root);
1989 int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
1990 struct btrfs_root *root,
1991 u64 bytenr, u64 num_bytes, u64 parent,
1992 u64 root_objectid, u64 owner, u64 offset);
1994 int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans,
1995 struct btrfs_root *root);
1996 int btrfs_extent_readonly(struct btrfs_root *root, u64 bytenr);
1997 int btrfs_free_block_groups(struct btrfs_fs_info *info);
1998 int btrfs_read_block_groups(struct btrfs_root *root);
1999 int btrfs_make_block_group(struct btrfs_trans_handle *trans,
2000 struct btrfs_root *root, u64 bytes_used,
2001 u64 type, u64 chunk_objectid, u64 chunk_offset,
2003 int btrfs_remove_block_group(struct btrfs_trans_handle *trans,
2004 struct btrfs_root *root, u64 group_start);
2005 int btrfs_prepare_block_group_relocation(struct btrfs_root *root,
2006 struct btrfs_block_group_cache *group);
2008 u64 btrfs_reduce_alloc_profile(struct btrfs_root *root, u64 flags);
2009 void btrfs_set_inode_space_info(struct btrfs_root *root, struct inode *ionde);
2010 void btrfs_clear_space_info_full(struct btrfs_fs_info *info);
2012 int btrfs_check_metadata_free_space(struct btrfs_root *root);
2013 int btrfs_check_data_free_space(struct btrfs_root *root, struct inode *inode,
2015 void btrfs_free_reserved_data_space(struct btrfs_root *root,
2016 struct inode *inode, u64 bytes);
2017 void btrfs_delalloc_reserve_space(struct btrfs_root *root, struct inode *inode,
2019 void btrfs_delalloc_free_space(struct btrfs_root *root, struct inode *inode,
2022 int btrfs_bin_search(struct extent_buffer *eb, struct btrfs_key *key,
2023 int level, int *slot);
2024 int btrfs_comp_cpu_keys(struct btrfs_key *k1, struct btrfs_key *k2);
2025 int btrfs_previous_item(struct btrfs_root *root,
2026 struct btrfs_path *path, u64 min_objectid,
2028 int btrfs_set_item_key_safe(struct btrfs_trans_handle *trans,
2029 struct btrfs_root *root, struct btrfs_path *path,
2030 struct btrfs_key *new_key);
2031 struct extent_buffer *btrfs_root_node(struct btrfs_root *root);
2032 struct extent_buffer *btrfs_lock_root_node(struct btrfs_root *root);
2033 int btrfs_find_next_key(struct btrfs_root *root, struct btrfs_path *path,
2034 struct btrfs_key *key, int lowest_level,
2035 int cache_only, u64 min_trans);
2036 int btrfs_search_forward(struct btrfs_root *root, struct btrfs_key *min_key,
2037 struct btrfs_key *max_key,
2038 struct btrfs_path *path, int cache_only,
2040 int btrfs_cow_block(struct btrfs_trans_handle *trans,
2041 struct btrfs_root *root, struct extent_buffer *buf,
2042 struct extent_buffer *parent, int parent_slot,
2043 struct extent_buffer **cow_ret);
2044 int btrfs_copy_root(struct btrfs_trans_handle *trans,
2045 struct btrfs_root *root,
2046 struct extent_buffer *buf,
2047 struct extent_buffer **cow_ret, u64 new_root_objectid);
2048 int btrfs_block_can_be_shared(struct btrfs_root *root,
2049 struct extent_buffer *buf);
2050 int btrfs_extend_item(struct btrfs_trans_handle *trans, struct btrfs_root
2051 *root, struct btrfs_path *path, u32 data_size);
2052 int btrfs_truncate_item(struct btrfs_trans_handle *trans,
2053 struct btrfs_root *root,
2054 struct btrfs_path *path,
2055 u32 new_size, int from_end);
2056 int btrfs_split_item(struct btrfs_trans_handle *trans,
2057 struct btrfs_root *root,
2058 struct btrfs_path *path,
2059 struct btrfs_key *new_key,
2060 unsigned long split_offset);
2061 int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root
2062 *root, struct btrfs_key *key, struct btrfs_path *p, int
2064 int btrfs_realloc_node(struct btrfs_trans_handle *trans,
2065 struct btrfs_root *root, struct extent_buffer *parent,
2066 int start_slot, int cache_only, u64 *last_ret,
2067 struct btrfs_key *progress);
2068 void btrfs_release_path(struct btrfs_root *root, struct btrfs_path *p);
2069 struct btrfs_path *btrfs_alloc_path(void);
2070 void btrfs_free_path(struct btrfs_path *p);
2071 void btrfs_set_path_blocking(struct btrfs_path *p);
2072 void btrfs_unlock_up_safe(struct btrfs_path *p, int level);
2074 int btrfs_del_items(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2075 struct btrfs_path *path, int slot, int nr);
2076 static inline int btrfs_del_item(struct btrfs_trans_handle *trans,
2077 struct btrfs_root *root,
2078 struct btrfs_path *path)
2080 return btrfs_del_items(trans, root, path, path->slots[0], 1);
2083 int btrfs_insert_item(struct btrfs_trans_handle *trans, struct btrfs_root
2084 *root, struct btrfs_key *key, void *data, u32 data_size);
2085 int btrfs_insert_some_items(struct btrfs_trans_handle *trans,
2086 struct btrfs_root *root,
2087 struct btrfs_path *path,
2088 struct btrfs_key *cpu_key, u32 *data_size,
2090 int btrfs_insert_empty_items(struct btrfs_trans_handle *trans,
2091 struct btrfs_root *root,
2092 struct btrfs_path *path,
2093 struct btrfs_key *cpu_key, u32 *data_size, int nr);
2095 static inline int btrfs_insert_empty_item(struct btrfs_trans_handle *trans,
2096 struct btrfs_root *root,
2097 struct btrfs_path *path,
2098 struct btrfs_key *key,
2101 return btrfs_insert_empty_items(trans, root, path, key, &data_size, 1);
2104 int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path);
2105 int btrfs_prev_leaf(struct btrfs_root *root, struct btrfs_path *path);
2106 int btrfs_leaf_free_space(struct btrfs_root *root, struct extent_buffer *leaf);
2107 int btrfs_drop_snapshot(struct btrfs_root *root, int update_ref);
2108 int btrfs_drop_subtree(struct btrfs_trans_handle *trans,
2109 struct btrfs_root *root,
2110 struct extent_buffer *node,
2111 struct extent_buffer *parent);
2113 int btrfs_find_root_ref(struct btrfs_root *tree_root,
2114 struct btrfs_path *path,
2115 u64 root_id, u64 ref_id);
2116 int btrfs_add_root_ref(struct btrfs_trans_handle *trans,
2117 struct btrfs_root *tree_root,
2118 u64 root_id, u8 type, u64 ref_id,
2119 u64 dirid, u64 sequence,
2120 const char *name, int name_len);
2121 int btrfs_del_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2122 struct btrfs_key *key);
2123 int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root
2124 *root, struct btrfs_key *key, struct btrfs_root_item
2126 int btrfs_update_root(struct btrfs_trans_handle *trans, struct btrfs_root
2127 *root, struct btrfs_key *key, struct btrfs_root_item
2129 int btrfs_find_last_root(struct btrfs_root *root, u64 objectid, struct
2130 btrfs_root_item *item, struct btrfs_key *key);
2131 int btrfs_search_root(struct btrfs_root *root, u64 search_start,
2132 u64 *found_objectid);
2133 int btrfs_find_dead_roots(struct btrfs_root *root, u64 objectid);
2134 int btrfs_set_root_node(struct btrfs_root_item *item,
2135 struct extent_buffer *node);
2137 int btrfs_insert_dir_item(struct btrfs_trans_handle *trans,
2138 struct btrfs_root *root, const char *name,
2139 int name_len, u64 dir,
2140 struct btrfs_key *location, u8 type, u64 index);
2141 struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans,
2142 struct btrfs_root *root,
2143 struct btrfs_path *path, u64 dir,
2144 const char *name, int name_len,
2146 struct btrfs_dir_item *
2147 btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans,
2148 struct btrfs_root *root,
2149 struct btrfs_path *path, u64 dir,
2150 u64 objectid, const char *name, int name_len,
2152 struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_root *root,
2153 struct btrfs_path *path,
2154 const char *name, int name_len);
2155 int btrfs_delete_one_dir_name(struct btrfs_trans_handle *trans,
2156 struct btrfs_root *root,
2157 struct btrfs_path *path,
2158 struct btrfs_dir_item *di);
2159 int btrfs_insert_xattr_item(struct btrfs_trans_handle *trans,
2160 struct btrfs_root *root, const char *name,
2161 u16 name_len, const void *data, u16 data_len,
2163 struct btrfs_dir_item *btrfs_lookup_xattr(struct btrfs_trans_handle *trans,
2164 struct btrfs_root *root,
2165 struct btrfs_path *path, u64 dir,
2166 const char *name, u16 name_len,
2170 int btrfs_insert_orphan_item(struct btrfs_trans_handle *trans,
2171 struct btrfs_root *root, u64 offset);
2172 int btrfs_del_orphan_item(struct btrfs_trans_handle *trans,
2173 struct btrfs_root *root, u64 offset);
2176 int btrfs_find_free_objectid(struct btrfs_trans_handle *trans,
2177 struct btrfs_root *fs_root,
2178 u64 dirid, u64 *objectid);
2179 int btrfs_find_highest_inode(struct btrfs_root *fs_root, u64 *objectid);
2182 int btrfs_insert_inode_ref(struct btrfs_trans_handle *trans,
2183 struct btrfs_root *root,
2184 const char *name, int name_len,
2185 u64 inode_objectid, u64 ref_objectid, u64 index);
2186 int btrfs_del_inode_ref(struct btrfs_trans_handle *trans,
2187 struct btrfs_root *root,
2188 const char *name, int name_len,
2189 u64 inode_objectid, u64 ref_objectid, u64 *index);
2190 int btrfs_insert_empty_inode(struct btrfs_trans_handle *trans,
2191 struct btrfs_root *root,
2192 struct btrfs_path *path, u64 objectid);
2193 int btrfs_lookup_inode(struct btrfs_trans_handle *trans, struct btrfs_root
2194 *root, struct btrfs_path *path,
2195 struct btrfs_key *location, int mod);
2198 int btrfs_del_csums(struct btrfs_trans_handle *trans,
2199 struct btrfs_root *root, u64 bytenr, u64 len);
2200 int btrfs_lookup_bio_sums(struct btrfs_root *root, struct inode *inode,
2201 struct bio *bio, u32 *dst);
2202 int btrfs_insert_file_extent(struct btrfs_trans_handle *trans,
2203 struct btrfs_root *root,
2204 u64 objectid, u64 pos,
2205 u64 disk_offset, u64 disk_num_bytes,
2206 u64 num_bytes, u64 offset, u64 ram_bytes,
2207 u8 compression, u8 encryption, u16 other_encoding);
2208 int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
2209 struct btrfs_root *root,
2210 struct btrfs_path *path, u64 objectid,
2211 u64 bytenr, int mod);
2212 int btrfs_csum_file_blocks(struct btrfs_trans_handle *trans,
2213 struct btrfs_root *root,
2214 struct btrfs_ordered_sum *sums);
2215 int btrfs_csum_one_bio(struct btrfs_root *root, struct inode *inode,
2216 struct bio *bio, u64 file_start, int contig);
2217 int btrfs_csum_file_bytes(struct btrfs_root *root, struct inode *inode,
2218 u64 start, unsigned long len);
2219 struct btrfs_csum_item *btrfs_lookup_csum(struct btrfs_trans_handle *trans,
2220 struct btrfs_root *root,
2221 struct btrfs_path *path,
2222 u64 bytenr, int cow);
2223 int btrfs_csum_truncate(struct btrfs_trans_handle *trans,
2224 struct btrfs_root *root, struct btrfs_path *path,
2226 int btrfs_lookup_csums_range(struct btrfs_root *root, u64 start,
2227 u64 end, struct list_head *list);
2230 /* RHEL and EL kernels have a patch that renames PG_checked to FsMisc */
2231 #if defined(ClearPageFsMisc) && !defined(ClearPageChecked)
2232 #define ClearPageChecked ClearPageFsMisc
2233 #define SetPageChecked SetPageFsMisc
2234 #define PageChecked PageFsMisc
2237 struct inode *btrfs_lookup_dentry(struct inode *dir, struct dentry *dentry);
2238 int btrfs_set_inode_index(struct inode *dir, u64 *index);
2239 int btrfs_unlink_inode(struct btrfs_trans_handle *trans,
2240 struct btrfs_root *root,
2241 struct inode *dir, struct inode *inode,
2242 const char *name, int name_len);
2243 int btrfs_add_link(struct btrfs_trans_handle *trans,
2244 struct inode *parent_inode, struct inode *inode,
2245 const char *name, int name_len, int add_backref, u64 index);
2246 int btrfs_truncate_inode_items(struct btrfs_trans_handle *trans,
2247 struct btrfs_root *root,
2248 struct inode *inode, u64 new_size,
2251 int btrfs_start_delalloc_inodes(struct btrfs_root *root);
2252 int btrfs_set_extent_delalloc(struct inode *inode, u64 start, u64 end);
2253 int btrfs_writepages(struct address_space *mapping,
2254 struct writeback_control *wbc);
2255 int btrfs_create_subvol_root(struct btrfs_trans_handle *trans,
2256 struct btrfs_root *new_root, struct dentry *dentry,
2257 u64 new_dirid, u64 alloc_hint);
2258 int btrfs_merge_bio_hook(struct page *page, unsigned long offset,
2259 size_t size, struct bio *bio, unsigned long bio_flags);
2261 unsigned long btrfs_force_ra(struct address_space *mapping,
2262 struct file_ra_state *ra, struct file *file,
2263 pgoff_t offset, pgoff_t last_index);
2264 int btrfs_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf);
2265 int btrfs_readpage(struct file *file, struct page *page);
2266 void btrfs_delete_inode(struct inode *inode);
2267 void btrfs_put_inode(struct inode *inode);
2268 int btrfs_write_inode(struct inode *inode, int wait);
2269 void btrfs_dirty_inode(struct inode *inode);
2270 struct inode *btrfs_alloc_inode(struct super_block *sb);
2271 void btrfs_destroy_inode(struct inode *inode);
2272 int btrfs_init_cachep(void);
2273 void btrfs_destroy_cachep(void);
2274 long btrfs_ioctl_trans_end(struct file *file);
2275 struct inode *btrfs_iget(struct super_block *s, struct btrfs_key *location,
2276 struct btrfs_root *root);
2277 int btrfs_commit_write(struct file *file, struct page *page,
2278 unsigned from, unsigned to);
2279 struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page,
2280 size_t page_offset, u64 start, u64 end,
2282 int btrfs_update_inode(struct btrfs_trans_handle *trans,
2283 struct btrfs_root *root,
2284 struct inode *inode);
2285 int btrfs_orphan_add(struct btrfs_trans_handle *trans, struct inode *inode);
2286 int btrfs_orphan_del(struct btrfs_trans_handle *trans, struct inode *inode);
2287 void btrfs_orphan_cleanup(struct btrfs_root *root);
2288 int btrfs_cont_expand(struct inode *inode, loff_t size);
2291 long btrfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
2292 void btrfs_update_iflags(struct inode *inode);
2293 void btrfs_inherit_iflags(struct inode *inode, struct inode *dir);
2296 int btrfs_sync_file(struct file *file, struct dentry *dentry, int datasync);
2297 int btrfs_drop_extent_cache(struct inode *inode, u64 start, u64 end,
2299 int btrfs_check_file(struct btrfs_root *root, struct inode *inode);
2300 extern struct file_operations btrfs_file_operations;
2301 int btrfs_drop_extents(struct btrfs_trans_handle *trans,
2302 struct btrfs_root *root, struct inode *inode,
2303 u64 start, u64 end, u64 locked_end,
2304 u64 inline_limit, u64 *hint_block, int drop_cache);
2305 int btrfs_mark_extent_written(struct btrfs_trans_handle *trans,
2306 struct btrfs_root *root,
2307 struct inode *inode, u64 start, u64 end);
2308 int btrfs_release_file(struct inode *inode, struct file *file);
2311 int btrfs_defrag_leaves(struct btrfs_trans_handle *trans,
2312 struct btrfs_root *root, int cache_only);
2315 int btrfs_init_sysfs(void);
2316 void btrfs_exit_sysfs(void);
2317 int btrfs_sysfs_add_super(struct btrfs_fs_info *fs);
2318 int btrfs_sysfs_add_root(struct btrfs_root *root);
2319 void btrfs_sysfs_del_root(struct btrfs_root *root);
2320 void btrfs_sysfs_del_super(struct btrfs_fs_info *root);
2323 ssize_t btrfs_listxattr(struct dentry *dentry, char *buffer, size_t size);
2326 u64 btrfs_parse_size(char *str);
2327 int btrfs_parse_options(struct btrfs_root *root, char *options);
2328 int btrfs_sync_fs(struct super_block *sb, int wait);
2331 #ifdef CONFIG_FS_POSIX_ACL
2332 int btrfs_check_acl(struct inode *inode, int mask);
2334 #define btrfs_check_acl NULL
2336 int btrfs_init_acl(struct inode *inode, struct inode *dir);
2337 int btrfs_acl_chmod(struct inode *inode);
2340 int btrfs_relocate_block_group(struct btrfs_root *root, u64 group_start);
2341 int btrfs_init_reloc_root(struct btrfs_trans_handle *trans,
2342 struct btrfs_root *root);
2343 int btrfs_update_reloc_root(struct btrfs_trans_handle *trans,
2344 struct btrfs_root *root);
2345 int btrfs_recover_relocation(struct btrfs_root *root);
2346 int btrfs_reloc_clone_csums(struct inode *inode, u64 file_pos, u64 len);