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__
23 #include <linux/highmem.h>
25 #include <linux/rwsem.h>
26 #include <linux/semaphore.h>
27 #include <linux/completion.h>
28 #include <linux/backing-dev.h>
29 #include <linux/wait.h>
30 #include <linux/slab.h>
31 #include <linux/kobject.h>
32 #include <trace/events/btrfs.h>
33 #include <asm/kmap_types.h>
34 #include <linux/pagemap.h>
35 #include <linux/btrfs.h>
36 #include <linux/workqueue.h>
37 #include "extent_io.h"
38 #include "extent_map.h"
39 #include "async-thread.h"
41 struct btrfs_trans_handle;
42 struct btrfs_transaction;
43 struct btrfs_pending_snapshot;
44 extern struct kmem_cache *btrfs_trans_handle_cachep;
45 extern struct kmem_cache *btrfs_transaction_cachep;
46 extern struct kmem_cache *btrfs_bit_radix_cachep;
47 extern struct kmem_cache *btrfs_path_cachep;
48 extern struct kmem_cache *btrfs_free_space_cachep;
49 struct btrfs_ordered_sum;
51 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
52 #define STATIC noinline
54 #define STATIC static noinline
57 #define BTRFS_MAGIC 0x4D5F53665248425FULL /* ascii _BHRfS_M, no null */
59 #define BTRFS_MAX_MIRRORS 3
61 #define BTRFS_MAX_LEVEL 8
63 #define BTRFS_COMPAT_EXTENT_TREE_V0
65 /* holds pointers to all of the tree roots */
66 #define BTRFS_ROOT_TREE_OBJECTID 1ULL
68 /* stores information about which extents are in use, and reference counts */
69 #define BTRFS_EXTENT_TREE_OBJECTID 2ULL
72 * chunk tree stores translations from logical -> physical block numbering
73 * the super block points to the chunk tree
75 #define BTRFS_CHUNK_TREE_OBJECTID 3ULL
78 * stores information about which areas of a given device are in use.
79 * one per device. The tree of tree roots points to the device tree
81 #define BTRFS_DEV_TREE_OBJECTID 4ULL
83 /* one per subvolume, storing files and directories */
84 #define BTRFS_FS_TREE_OBJECTID 5ULL
86 /* directory objectid inside the root tree */
87 #define BTRFS_ROOT_TREE_DIR_OBJECTID 6ULL
89 /* holds checksums of all the data extents */
90 #define BTRFS_CSUM_TREE_OBJECTID 7ULL
92 /* holds quota configuration and tracking */
93 #define BTRFS_QUOTA_TREE_OBJECTID 8ULL
95 /* for storing items that use the BTRFS_UUID_KEY* types */
96 #define BTRFS_UUID_TREE_OBJECTID 9ULL
98 /* for storing balance parameters in the root tree */
99 #define BTRFS_BALANCE_OBJECTID -4ULL
101 /* orhpan objectid for tracking unlinked/truncated files */
102 #define BTRFS_ORPHAN_OBJECTID -5ULL
104 /* does write ahead logging to speed up fsyncs */
105 #define BTRFS_TREE_LOG_OBJECTID -6ULL
106 #define BTRFS_TREE_LOG_FIXUP_OBJECTID -7ULL
108 /* for space balancing */
109 #define BTRFS_TREE_RELOC_OBJECTID -8ULL
110 #define BTRFS_DATA_RELOC_TREE_OBJECTID -9ULL
113 * extent checksums all have this objectid
114 * this allows them to share the logging tree
117 #define BTRFS_EXTENT_CSUM_OBJECTID -10ULL
119 /* For storing free space cache */
120 #define BTRFS_FREE_SPACE_OBJECTID -11ULL
123 * The inode number assigned to the special inode for storing
126 #define BTRFS_FREE_INO_OBJECTID -12ULL
128 /* dummy objectid represents multiple objectids */
129 #define BTRFS_MULTIPLE_OBJECTIDS -255ULL
132 * All files have objectids in this range.
134 #define BTRFS_FIRST_FREE_OBJECTID 256ULL
135 #define BTRFS_LAST_FREE_OBJECTID -256ULL
136 #define BTRFS_FIRST_CHUNK_TREE_OBJECTID 256ULL
140 * the device items go into the chunk tree. The key is in the form
141 * [ 1 BTRFS_DEV_ITEM_KEY device_id ]
143 #define BTRFS_DEV_ITEMS_OBJECTID 1ULL
145 #define BTRFS_BTREE_INODE_OBJECTID 1
147 #define BTRFS_EMPTY_SUBVOL_DIR_OBJECTID 2
149 #define BTRFS_DEV_REPLACE_DEVID 0ULL
152 * the max metadata block size. This limit is somewhat artificial,
153 * but the memmove costs go through the roof for larger blocks.
155 #define BTRFS_MAX_METADATA_BLOCKSIZE 65536
158 * we can actually store much bigger names, but lets not confuse the rest
161 #define BTRFS_NAME_LEN 255
164 * Theoretical limit is larger, but we keep this down to a sane
165 * value. That should limit greatly the possibility of collisions on
168 #define BTRFS_LINK_MAX 65535U
170 /* 32 bytes in various csum fields */
171 #define BTRFS_CSUM_SIZE 32
174 #define BTRFS_CSUM_TYPE_CRC32 0
176 static int btrfs_csum_sizes[] = { 4, 0 };
178 /* four bytes for CRC32 */
179 #define BTRFS_EMPTY_DIR_SIZE 0
181 /* spefic to btrfs_map_block(), therefore not in include/linux/blk_types.h */
182 #define REQ_GET_READ_MIRRORS (1 << 30)
184 #define BTRFS_FT_UNKNOWN 0
185 #define BTRFS_FT_REG_FILE 1
186 #define BTRFS_FT_DIR 2
187 #define BTRFS_FT_CHRDEV 3
188 #define BTRFS_FT_BLKDEV 4
189 #define BTRFS_FT_FIFO 5
190 #define BTRFS_FT_SOCK 6
191 #define BTRFS_FT_SYMLINK 7
192 #define BTRFS_FT_XATTR 8
193 #define BTRFS_FT_MAX 9
195 /* ioprio of readahead is set to idle */
196 #define BTRFS_IOPRIO_READA (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_IDLE, 0))
198 #define BTRFS_DIRTY_METADATA_THRESH (32 * 1024 * 1024)
201 * The key defines the order in the tree, and so it also defines (optimal)
204 * objectid corresponds to the inode number.
206 * type tells us things about the object, and is a kind of stream selector.
207 * so for a given inode, keys with type of 1 might refer to the inode data,
208 * type of 2 may point to file data in the btree and type == 3 may point to
211 * offset is the starting byte offset for this key in the stream.
213 * btrfs_disk_key is in disk byte order. struct btrfs_key is always
214 * in cpu native order. Otherwise they are identical and their sizes
215 * should be the same (ie both packed)
217 struct btrfs_disk_key {
221 } __attribute__ ((__packed__));
227 } __attribute__ ((__packed__));
229 struct btrfs_mapping_tree {
230 struct extent_map_tree map_tree;
233 struct btrfs_dev_item {
234 /* the internal btrfs device id */
237 /* size of the device */
243 /* optimal io alignment for this device */
246 /* optimal io width for this device */
249 /* minimal io size for this device */
252 /* type and info about this device */
255 /* expected generation for this device */
259 * starting byte of this partition on the device,
260 * to allow for stripe alignment in the future
264 /* grouping information for allocation decisions */
267 /* seek speed 0-100 where 100 is fastest */
270 /* bandwidth 0-100 where 100 is fastest */
273 /* btrfs generated uuid for this device */
274 u8 uuid[BTRFS_UUID_SIZE];
276 /* uuid of FS who owns this device */
277 u8 fsid[BTRFS_UUID_SIZE];
278 } __attribute__ ((__packed__));
280 struct btrfs_stripe {
283 u8 dev_uuid[BTRFS_UUID_SIZE];
284 } __attribute__ ((__packed__));
287 /* size of this chunk in bytes */
290 /* objectid of the root referencing this chunk */
296 /* optimal io alignment for this chunk */
299 /* optimal io width for this chunk */
302 /* minimal io size for this chunk */
305 /* 2^16 stripes is quite a lot, a second limit is the size of a single
310 /* sub stripes only matter for raid10 */
312 struct btrfs_stripe stripe;
313 /* additional stripes go here */
314 } __attribute__ ((__packed__));
316 #define BTRFS_FREE_SPACE_EXTENT 1
317 #define BTRFS_FREE_SPACE_BITMAP 2
319 struct btrfs_free_space_entry {
323 } __attribute__ ((__packed__));
325 struct btrfs_free_space_header {
326 struct btrfs_disk_key location;
330 } __attribute__ ((__packed__));
332 static inline unsigned long btrfs_chunk_item_size(int num_stripes)
334 BUG_ON(num_stripes == 0);
335 return sizeof(struct btrfs_chunk) +
336 sizeof(struct btrfs_stripe) * (num_stripes - 1);
339 #define BTRFS_HEADER_FLAG_WRITTEN (1ULL << 0)
340 #define BTRFS_HEADER_FLAG_RELOC (1ULL << 1)
345 #define BTRFS_FS_STATE_ERROR 0
346 #define BTRFS_FS_STATE_REMOUNTING 1
347 #define BTRFS_FS_STATE_TRANS_ABORTED 2
348 #define BTRFS_FS_STATE_DEV_REPLACING 3
350 /* Super block flags */
351 /* Errors detected */
352 #define BTRFS_SUPER_FLAG_ERROR (1ULL << 2)
354 #define BTRFS_SUPER_FLAG_SEEDING (1ULL << 32)
355 #define BTRFS_SUPER_FLAG_METADUMP (1ULL << 33)
357 #define BTRFS_BACKREF_REV_MAX 256
358 #define BTRFS_BACKREF_REV_SHIFT 56
359 #define BTRFS_BACKREF_REV_MASK (((u64)BTRFS_BACKREF_REV_MAX - 1) << \
360 BTRFS_BACKREF_REV_SHIFT)
362 #define BTRFS_OLD_BACKREF_REV 0
363 #define BTRFS_MIXED_BACKREF_REV 1
366 * every tree block (leaf or node) starts with this header.
368 struct btrfs_header {
369 /* these first four must match the super block */
370 u8 csum[BTRFS_CSUM_SIZE];
371 u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
372 __le64 bytenr; /* which block this node is supposed to live in */
375 /* allowed to be different from the super from here on down */
376 u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
381 } __attribute__ ((__packed__));
383 #define BTRFS_NODEPTRS_PER_BLOCK(r) (((r)->nodesize - \
384 sizeof(struct btrfs_header)) / \
385 sizeof(struct btrfs_key_ptr))
386 #define __BTRFS_LEAF_DATA_SIZE(bs) ((bs) - sizeof(struct btrfs_header))
387 #define BTRFS_LEAF_DATA_SIZE(r) (__BTRFS_LEAF_DATA_SIZE(r->nodesize))
388 #define BTRFS_FILE_EXTENT_INLINE_DATA_START \
389 (offsetof(struct btrfs_file_extent_item, disk_bytenr))
390 #define BTRFS_MAX_INLINE_DATA_SIZE(r) (BTRFS_LEAF_DATA_SIZE(r) - \
391 sizeof(struct btrfs_item) - \
392 BTRFS_FILE_EXTENT_INLINE_DATA_START)
393 #define BTRFS_MAX_XATTR_SIZE(r) (BTRFS_LEAF_DATA_SIZE(r) - \
394 sizeof(struct btrfs_item) -\
395 sizeof(struct btrfs_dir_item))
399 * this is a very generous portion of the super block, giving us
400 * room to translate 14 chunks with 3 stripes each.
402 #define BTRFS_SYSTEM_CHUNK_ARRAY_SIZE 2048
403 #define BTRFS_LABEL_SIZE 256
406 * just in case we somehow lose the roots and are not able to mount,
407 * we store an array of the roots from previous transactions
410 #define BTRFS_NUM_BACKUP_ROOTS 4
411 struct btrfs_root_backup {
413 __le64 tree_root_gen;
416 __le64 chunk_root_gen;
419 __le64 extent_root_gen;
428 __le64 csum_root_gen;
438 u8 extent_root_level;
442 /* future and to align */
444 } __attribute__ ((__packed__));
447 * the super block basically lists the main trees of the FS
448 * it currently lacks any block count etc etc
450 struct btrfs_super_block {
451 u8 csum[BTRFS_CSUM_SIZE];
452 /* the first 4 fields must match struct btrfs_header */
453 u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
454 __le64 bytenr; /* this block number */
457 /* allowed to be different from the btrfs_header from here own down */
464 /* this will help find the new super based on the log root */
465 __le64 log_root_transid;
468 __le64 root_dir_objectid;
472 __le32 __unused_leafsize;
474 __le32 sys_chunk_array_size;
475 __le64 chunk_root_generation;
477 __le64 compat_ro_flags;
478 __le64 incompat_flags;
483 struct btrfs_dev_item dev_item;
485 char label[BTRFS_LABEL_SIZE];
487 __le64 cache_generation;
488 __le64 uuid_tree_generation;
490 /* future expansion */
492 u8 sys_chunk_array[BTRFS_SYSTEM_CHUNK_ARRAY_SIZE];
493 struct btrfs_root_backup super_roots[BTRFS_NUM_BACKUP_ROOTS];
494 } __attribute__ ((__packed__));
497 * Compat flags that we support. If any incompat flags are set other than the
498 * ones specified below then we will fail to mount
500 #define BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF (1ULL << 0)
501 #define BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL (1ULL << 1)
502 #define BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS (1ULL << 2)
503 #define BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO (1ULL << 3)
505 * some patches floated around with a second compression method
506 * lets save that incompat here for when they do get in
507 * Note we don't actually support it, we're just reserving the
510 #define BTRFS_FEATURE_INCOMPAT_COMPRESS_LZOv2 (1ULL << 4)
513 * older kernels tried to do bigger metadata blocks, but the
514 * code was pretty buggy. Lets not let them try anymore.
516 #define BTRFS_FEATURE_INCOMPAT_BIG_METADATA (1ULL << 5)
518 #define BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF (1ULL << 6)
519 #define BTRFS_FEATURE_INCOMPAT_RAID56 (1ULL << 7)
520 #define BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA (1ULL << 8)
521 #define BTRFS_FEATURE_INCOMPAT_NO_HOLES (1ULL << 9)
523 #define BTRFS_FEATURE_COMPAT_SUPP 0ULL
524 #define BTRFS_FEATURE_COMPAT_SAFE_SET 0ULL
525 #define BTRFS_FEATURE_COMPAT_SAFE_CLEAR 0ULL
526 #define BTRFS_FEATURE_COMPAT_RO_SUPP 0ULL
527 #define BTRFS_FEATURE_COMPAT_RO_SAFE_SET 0ULL
528 #define BTRFS_FEATURE_COMPAT_RO_SAFE_CLEAR 0ULL
530 #define BTRFS_FEATURE_INCOMPAT_SUPP \
531 (BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF | \
532 BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL | \
533 BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS | \
534 BTRFS_FEATURE_INCOMPAT_BIG_METADATA | \
535 BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO | \
536 BTRFS_FEATURE_INCOMPAT_RAID56 | \
537 BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF | \
538 BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA | \
539 BTRFS_FEATURE_INCOMPAT_NO_HOLES)
541 #define BTRFS_FEATURE_INCOMPAT_SAFE_SET \
542 (BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF)
543 #define BTRFS_FEATURE_INCOMPAT_SAFE_CLEAR 0ULL
546 * A leaf is full of items. offset and size tell us where to find
547 * the item in the leaf (relative to the start of the data area)
550 struct btrfs_disk_key key;
553 } __attribute__ ((__packed__));
556 * leaves have an item area and a data area:
557 * [item0, item1....itemN] [free space] [dataN...data1, data0]
559 * The data is separate from the items to get the keys closer together
563 struct btrfs_header header;
564 struct btrfs_item items[];
565 } __attribute__ ((__packed__));
568 * all non-leaf blocks are nodes, they hold only keys and pointers to
571 struct btrfs_key_ptr {
572 struct btrfs_disk_key key;
575 } __attribute__ ((__packed__));
578 struct btrfs_header header;
579 struct btrfs_key_ptr ptrs[];
580 } __attribute__ ((__packed__));
583 * btrfs_paths remember the path taken from the root down to the leaf.
584 * level 0 is always the leaf, and nodes[1...BTRFS_MAX_LEVEL] will point
585 * to any other levels that are present.
587 * The slots array records the index of the item or block pointer
588 * used while walking the tree.
591 struct extent_buffer *nodes[BTRFS_MAX_LEVEL];
592 int slots[BTRFS_MAX_LEVEL];
593 /* if there is real range locking, this locks field will change */
594 int locks[BTRFS_MAX_LEVEL];
596 /* keep some upper locks as we walk down */
600 * set by btrfs_split_item, tells search_slot to keep all locks
601 * and to force calls to keep space in the nodes
603 unsigned int search_for_split:1;
604 unsigned int keep_locks:1;
605 unsigned int skip_locking:1;
606 unsigned int leave_spinning:1;
607 unsigned int search_commit_root:1;
608 unsigned int need_commit_sem:1;
612 * items in the extent btree are used to record the objectid of the
613 * owner of the block and the number of references
616 struct btrfs_extent_item {
620 } __attribute__ ((__packed__));
622 struct btrfs_extent_item_v0 {
624 } __attribute__ ((__packed__));
626 #define BTRFS_MAX_EXTENT_ITEM_SIZE(r) ((BTRFS_LEAF_DATA_SIZE(r) >> 4) - \
627 sizeof(struct btrfs_item))
629 #define BTRFS_EXTENT_FLAG_DATA (1ULL << 0)
630 #define BTRFS_EXTENT_FLAG_TREE_BLOCK (1ULL << 1)
632 /* following flags only apply to tree blocks */
634 /* use full backrefs for extent pointers in the block */
635 #define BTRFS_BLOCK_FLAG_FULL_BACKREF (1ULL << 8)
638 * this flag is only used internally by scrub and may be changed at any time
639 * it is only declared here to avoid collisions
641 #define BTRFS_EXTENT_FLAG_SUPER (1ULL << 48)
643 struct btrfs_tree_block_info {
644 struct btrfs_disk_key key;
646 } __attribute__ ((__packed__));
648 struct btrfs_extent_data_ref {
653 } __attribute__ ((__packed__));
655 struct btrfs_shared_data_ref {
657 } __attribute__ ((__packed__));
659 struct btrfs_extent_inline_ref {
662 } __attribute__ ((__packed__));
664 /* old style backrefs item */
665 struct btrfs_extent_ref_v0 {
670 } __attribute__ ((__packed__));
673 /* dev extents record free space on individual devices. The owner
674 * field points back to the chunk allocation mapping tree that allocated
675 * the extent. The chunk tree uuid field is a way to double check the owner
677 struct btrfs_dev_extent {
679 __le64 chunk_objectid;
682 u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
683 } __attribute__ ((__packed__));
685 struct btrfs_inode_ref {
689 } __attribute__ ((__packed__));
691 struct btrfs_inode_extref {
692 __le64 parent_objectid;
697 } __attribute__ ((__packed__));
699 struct btrfs_timespec {
702 } __attribute__ ((__packed__));
704 enum btrfs_compression_type {
705 BTRFS_COMPRESS_NONE = 0,
706 BTRFS_COMPRESS_ZLIB = 1,
707 BTRFS_COMPRESS_LZO = 2,
708 BTRFS_COMPRESS_TYPES = 2,
709 BTRFS_COMPRESS_LAST = 3,
712 struct btrfs_inode_item {
713 /* nfs style generation number */
715 /* transid that last touched this inode */
727 /* modification sequence number for NFS */
731 * a little future expansion, for more than this we can
732 * just grow the inode item and version it
735 struct btrfs_timespec atime;
736 struct btrfs_timespec ctime;
737 struct btrfs_timespec mtime;
738 struct btrfs_timespec otime;
739 } __attribute__ ((__packed__));
741 struct btrfs_dir_log_item {
743 } __attribute__ ((__packed__));
745 struct btrfs_dir_item {
746 struct btrfs_disk_key location;
751 } __attribute__ ((__packed__));
753 #define BTRFS_ROOT_SUBVOL_RDONLY (1ULL << 0)
756 * Internal in-memory flag that a subvolume has been marked for deletion but
757 * still visible as a directory
759 #define BTRFS_ROOT_SUBVOL_DEAD (1ULL << 48)
761 struct btrfs_root_item {
762 struct btrfs_inode_item inode;
768 __le64 last_snapshot;
771 struct btrfs_disk_key drop_progress;
776 * The following fields appear after subvol_uuids+subvol_times
781 * This generation number is used to test if the new fields are valid
782 * and up to date while reading the root item. Everytime the root item
783 * is written out, the "generation" field is copied into this field. If
784 * anyone ever mounted the fs with an older kernel, we will have
785 * mismatching generation values here and thus must invalidate the
786 * new fields. See btrfs_update_root and btrfs_find_last_root for
788 * the offset of generation_v2 is also used as the start for the memset
789 * when invalidating the fields.
791 __le64 generation_v2;
792 u8 uuid[BTRFS_UUID_SIZE];
793 u8 parent_uuid[BTRFS_UUID_SIZE];
794 u8 received_uuid[BTRFS_UUID_SIZE];
795 __le64 ctransid; /* updated when an inode changes */
796 __le64 otransid; /* trans when created */
797 __le64 stransid; /* trans when sent. non-zero for received subvol */
798 __le64 rtransid; /* trans when received. non-zero for received subvol */
799 struct btrfs_timespec ctime;
800 struct btrfs_timespec otime;
801 struct btrfs_timespec stime;
802 struct btrfs_timespec rtime;
803 __le64 reserved[8]; /* for future */
804 } __attribute__ ((__packed__));
807 * this is used for both forward and backward root refs
809 struct btrfs_root_ref {
813 } __attribute__ ((__packed__));
815 struct btrfs_disk_balance_args {
817 * profiles to operate on, single is denoted by
818 * BTRFS_AVAIL_ALLOC_BIT_SINGLE
828 /* devid subset filter [pstart..pend) */
832 /* btrfs virtual address space subset filter [vstart..vend) */
837 * profile to convert to, single is denoted by
838 * BTRFS_AVAIL_ALLOC_BIT_SINGLE
842 /* BTRFS_BALANCE_ARGS_* */
845 /* BTRFS_BALANCE_ARGS_LIMIT value */
849 } __attribute__ ((__packed__));
852 * store balance parameters to disk so that balance can be properly
853 * resumed after crash or unmount
855 struct btrfs_balance_item {
856 /* BTRFS_BALANCE_* */
859 struct btrfs_disk_balance_args data;
860 struct btrfs_disk_balance_args meta;
861 struct btrfs_disk_balance_args sys;
864 } __attribute__ ((__packed__));
866 #define BTRFS_FILE_EXTENT_INLINE 0
867 #define BTRFS_FILE_EXTENT_REG 1
868 #define BTRFS_FILE_EXTENT_PREALLOC 2
870 struct btrfs_file_extent_item {
872 * transaction id that created this extent
876 * max number of bytes to hold this extent in ram
877 * when we split a compressed extent we can't know how big
878 * each of the resulting pieces will be. So, this is
879 * an upper limit on the size of the extent in ram instead of
885 * 32 bits for the various ways we might encode the data,
886 * including compression and encryption. If any of these
887 * are set to something a given disk format doesn't understand
888 * it is treated like an incompat flag for reading and writing,
893 __le16 other_encoding; /* spare for later use */
895 /* are we inline data or a real extent? */
899 * disk space consumed by the extent, checksum blocks are included
902 * At this offset in the structure, the inline extent data start.
905 __le64 disk_num_bytes;
907 * the logical offset in file blocks (no csums)
908 * this extent record is for. This allows a file extent to point
909 * into the middle of an existing extent on disk, sharing it
910 * between two snapshots (useful if some bytes in the middle of the
911 * extent have changed
915 * the logical number of file blocks (no csums included). This
916 * always reflects the size uncompressed and without encoding.
920 } __attribute__ ((__packed__));
922 struct btrfs_csum_item {
924 } __attribute__ ((__packed__));
926 struct btrfs_dev_stats_item {
928 * grow this item struct at the end for future enhancements and keep
929 * the existing values unchanged
931 __le64 values[BTRFS_DEV_STAT_VALUES_MAX];
932 } __attribute__ ((__packed__));
934 #define BTRFS_DEV_REPLACE_ITEM_CONT_READING_FROM_SRCDEV_MODE_ALWAYS 0
935 #define BTRFS_DEV_REPLACE_ITEM_CONT_READING_FROM_SRCDEV_MODE_AVOID 1
936 #define BTRFS_DEV_REPLACE_ITEM_STATE_NEVER_STARTED 0
937 #define BTRFS_DEV_REPLACE_ITEM_STATE_STARTED 1
938 #define BTRFS_DEV_REPLACE_ITEM_STATE_SUSPENDED 2
939 #define BTRFS_DEV_REPLACE_ITEM_STATE_FINISHED 3
940 #define BTRFS_DEV_REPLACE_ITEM_STATE_CANCELED 4
942 struct btrfs_dev_replace {
943 u64 replace_state; /* see #define above */
944 u64 time_started; /* seconds since 1-Jan-1970 */
945 u64 time_stopped; /* seconds since 1-Jan-1970 */
946 atomic64_t num_write_errors;
947 atomic64_t num_uncorrectable_read_errors;
950 u64 committed_cursor_left;
951 u64 cursor_left_last_write_of_item;
954 u64 cont_reading_from_srcdev_mode; /* see #define above */
957 int item_needs_writeback;
958 struct btrfs_device *srcdev;
959 struct btrfs_device *tgtdev;
962 atomic_t nesting_level;
963 struct mutex lock_finishing_cancel_unmount;
964 struct mutex lock_management_lock;
967 struct btrfs_scrub_progress scrub_progress;
970 struct btrfs_dev_replace_item {
972 * grow this item struct at the end for future enhancements and keep
973 * the existing values unchanged
978 __le64 cont_reading_from_srcdev_mode;
980 __le64 replace_state;
983 __le64 num_write_errors;
984 __le64 num_uncorrectable_read_errors;
985 } __attribute__ ((__packed__));
987 /* different types of block groups (and chunks) */
988 #define BTRFS_BLOCK_GROUP_DATA (1ULL << 0)
989 #define BTRFS_BLOCK_GROUP_SYSTEM (1ULL << 1)
990 #define BTRFS_BLOCK_GROUP_METADATA (1ULL << 2)
991 #define BTRFS_BLOCK_GROUP_RAID0 (1ULL << 3)
992 #define BTRFS_BLOCK_GROUP_RAID1 (1ULL << 4)
993 #define BTRFS_BLOCK_GROUP_DUP (1ULL << 5)
994 #define BTRFS_BLOCK_GROUP_RAID10 (1ULL << 6)
995 #define BTRFS_BLOCK_GROUP_RAID5 (1ULL << 7)
996 #define BTRFS_BLOCK_GROUP_RAID6 (1ULL << 8)
997 #define BTRFS_BLOCK_GROUP_RESERVED (BTRFS_AVAIL_ALLOC_BIT_SINGLE | \
998 BTRFS_SPACE_INFO_GLOBAL_RSV)
1000 enum btrfs_raid_types {
1011 #define BTRFS_BLOCK_GROUP_TYPE_MASK (BTRFS_BLOCK_GROUP_DATA | \
1012 BTRFS_BLOCK_GROUP_SYSTEM | \
1013 BTRFS_BLOCK_GROUP_METADATA)
1015 #define BTRFS_BLOCK_GROUP_PROFILE_MASK (BTRFS_BLOCK_GROUP_RAID0 | \
1016 BTRFS_BLOCK_GROUP_RAID1 | \
1017 BTRFS_BLOCK_GROUP_RAID5 | \
1018 BTRFS_BLOCK_GROUP_RAID6 | \
1019 BTRFS_BLOCK_GROUP_DUP | \
1020 BTRFS_BLOCK_GROUP_RAID10)
1022 * We need a bit for restriper to be able to tell when chunks of type
1023 * SINGLE are available. This "extended" profile format is used in
1024 * fs_info->avail_*_alloc_bits (in-memory) and balance item fields
1025 * (on-disk). The corresponding on-disk bit in chunk.type is reserved
1026 * to avoid remappings between two formats in future.
1028 #define BTRFS_AVAIL_ALLOC_BIT_SINGLE (1ULL << 48)
1031 * A fake block group type that is used to communicate global block reserve
1032 * size to userspace via the SPACE_INFO ioctl.
1034 #define BTRFS_SPACE_INFO_GLOBAL_RSV (1ULL << 49)
1036 #define BTRFS_EXTENDED_PROFILE_MASK (BTRFS_BLOCK_GROUP_PROFILE_MASK | \
1037 BTRFS_AVAIL_ALLOC_BIT_SINGLE)
1039 static inline u64 chunk_to_extended(u64 flags)
1041 if ((flags & BTRFS_BLOCK_GROUP_PROFILE_MASK) == 0)
1042 flags |= BTRFS_AVAIL_ALLOC_BIT_SINGLE;
1046 static inline u64 extended_to_chunk(u64 flags)
1048 return flags & ~BTRFS_AVAIL_ALLOC_BIT_SINGLE;
1051 struct btrfs_block_group_item {
1053 __le64 chunk_objectid;
1055 } __attribute__ ((__packed__));
1058 * is subvolume quota turned on?
1060 #define BTRFS_QGROUP_STATUS_FLAG_ON (1ULL << 0)
1062 * RESCAN is set during the initialization phase
1064 #define BTRFS_QGROUP_STATUS_FLAG_RESCAN (1ULL << 1)
1066 * Some qgroup entries are known to be out of date,
1067 * either because the configuration has changed in a way that
1068 * makes a rescan necessary, or because the fs has been mounted
1069 * with a non-qgroup-aware version.
1070 * Turning qouta off and on again makes it inconsistent, too.
1072 #define BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT (1ULL << 2)
1074 #define BTRFS_QGROUP_STATUS_VERSION 1
1076 struct btrfs_qgroup_status_item {
1079 * the generation is updated during every commit. As older
1080 * versions of btrfs are not aware of qgroups, it will be
1081 * possible to detect inconsistencies by checking the
1082 * generation on mount time
1086 /* flag definitions see above */
1090 * only used during scanning to record the progress
1091 * of the scan. It contains a logical address
1094 } __attribute__ ((__packed__));
1096 struct btrfs_qgroup_info_item {
1102 } __attribute__ ((__packed__));
1104 /* flags definition for qgroup limits */
1105 #define BTRFS_QGROUP_LIMIT_MAX_RFER (1ULL << 0)
1106 #define BTRFS_QGROUP_LIMIT_MAX_EXCL (1ULL << 1)
1107 #define BTRFS_QGROUP_LIMIT_RSV_RFER (1ULL << 2)
1108 #define BTRFS_QGROUP_LIMIT_RSV_EXCL (1ULL << 3)
1109 #define BTRFS_QGROUP_LIMIT_RFER_CMPR (1ULL << 4)
1110 #define BTRFS_QGROUP_LIMIT_EXCL_CMPR (1ULL << 5)
1112 struct btrfs_qgroup_limit_item {
1114 * only updated when any of the other values change
1121 } __attribute__ ((__packed__));
1123 /* For raid type sysfs entries */
1124 struct raid_kobject {
1126 struct kobject kobj;
1129 struct btrfs_space_info {
1132 u64 total_bytes; /* total bytes in the space,
1133 this doesn't take mirrors into account */
1134 u64 bytes_used; /* total bytes used,
1135 this doesn't take mirrors into account */
1136 u64 bytes_pinned; /* total bytes pinned, will be freed when the
1137 transaction finishes */
1138 u64 bytes_reserved; /* total bytes the allocator has reserved for
1139 current allocations */
1140 u64 bytes_may_use; /* number of bytes that may be used for
1141 delalloc/allocations */
1142 u64 bytes_readonly; /* total bytes that are read only */
1144 unsigned int full:1; /* indicates that we cannot allocate any more
1145 chunks for this space */
1146 unsigned int chunk_alloc:1; /* set if we are allocating a chunk */
1148 unsigned int flush:1; /* set if we are trying to make space */
1150 unsigned int force_alloc; /* set if we need to force a chunk
1151 alloc for this space */
1153 u64 disk_used; /* total bytes used on disk */
1154 u64 disk_total; /* total bytes on disk, takes mirrors into
1160 * bytes_pinned is kept in line with what is actually pinned, as in
1161 * we've called update_block_group and dropped the bytes_used counter
1162 * and increased the bytes_pinned counter. However this means that
1163 * bytes_pinned does not reflect the bytes that will be pinned once the
1164 * delayed refs are flushed, so this counter is inc'ed everytime we call
1165 * btrfs_free_extent so it is a realtime count of what will be freed
1166 * once the transaction is committed. It will be zero'ed everytime the
1167 * transaction commits.
1169 struct percpu_counter total_bytes_pinned;
1171 struct list_head list;
1173 struct rw_semaphore groups_sem;
1174 /* for block groups in our same type */
1175 struct list_head block_groups[BTRFS_NR_RAID_TYPES];
1176 wait_queue_head_t wait;
1178 struct kobject kobj;
1179 struct kobject *block_group_kobjs[BTRFS_NR_RAID_TYPES];
1182 #define BTRFS_BLOCK_RSV_GLOBAL 1
1183 #define BTRFS_BLOCK_RSV_DELALLOC 2
1184 #define BTRFS_BLOCK_RSV_TRANS 3
1185 #define BTRFS_BLOCK_RSV_CHUNK 4
1186 #define BTRFS_BLOCK_RSV_DELOPS 5
1187 #define BTRFS_BLOCK_RSV_EMPTY 6
1188 #define BTRFS_BLOCK_RSV_TEMP 7
1190 struct btrfs_block_rsv {
1193 struct btrfs_space_info *space_info;
1195 unsigned short full;
1196 unsigned short type;
1197 unsigned short failfast;
1201 * free clusters are used to claim free space in relatively large chunks,
1202 * allowing us to do less seeky writes. They are used for all metadata
1203 * allocations and data allocations in ssd mode.
1205 struct btrfs_free_cluster {
1207 spinlock_t refill_lock;
1208 struct rb_root root;
1210 /* largest extent in this cluster */
1213 /* first extent starting offset */
1216 struct btrfs_block_group_cache *block_group;
1218 * when a cluster is allocated from a block group, we put the
1219 * cluster onto a list in the block group so that it can
1220 * be freed before the block group is freed.
1222 struct list_head block_group_list;
1225 enum btrfs_caching_type {
1227 BTRFS_CACHE_STARTED = 1,
1228 BTRFS_CACHE_FAST = 2,
1229 BTRFS_CACHE_FINISHED = 3,
1230 BTRFS_CACHE_ERROR = 4,
1233 enum btrfs_disk_cache_state {
1234 BTRFS_DC_WRITTEN = 0,
1238 BTRFS_DC_NEED_WRITE = 4,
1241 struct btrfs_caching_control {
1242 struct list_head list;
1244 wait_queue_head_t wait;
1245 struct btrfs_work work;
1246 struct btrfs_block_group_cache *block_group;
1251 struct btrfs_block_group_cache {
1252 struct btrfs_key key;
1253 struct btrfs_block_group_item item;
1254 struct btrfs_fs_info *fs_info;
1255 struct inode *inode;
1263 u64 cache_generation;
1266 * It is just used for the delayed data space allocation because
1267 * only the data space allocation and the relative metadata update
1268 * can be done cross the transaction.
1270 struct rw_semaphore data_rwsem;
1272 /* for raid56, this is a full stripe, without parity */
1273 unsigned long full_stripe_len;
1276 unsigned int dirty:1;
1277 unsigned int iref:1;
1279 int disk_cache_state;
1281 /* cache tracking stuff */
1283 struct btrfs_caching_control *caching_ctl;
1284 u64 last_byte_to_unpin;
1286 struct btrfs_space_info *space_info;
1288 /* free space cache stuff */
1289 struct btrfs_free_space_ctl *free_space_ctl;
1291 /* block group cache stuff */
1292 struct rb_node cache_node;
1294 /* for block groups in the same raid type */
1295 struct list_head list;
1300 /* List of struct btrfs_free_clusters for this block group.
1301 * Today it will only have one thing on it, but that may change
1303 struct list_head cluster_list;
1305 /* For delayed block group creation or deletion of empty block groups */
1306 struct list_head bg_list;
1309 /* delayed seq elem */
1311 struct list_head list;
1315 enum btrfs_orphan_cleanup_state {
1316 ORPHAN_CLEANUP_STARTED = 1,
1317 ORPHAN_CLEANUP_DONE = 2,
1320 /* used by the raid56 code to lock stripes for read/modify/write */
1321 struct btrfs_stripe_hash {
1322 struct list_head hash_list;
1323 wait_queue_head_t wait;
1327 /* used by the raid56 code to lock stripes for read/modify/write */
1328 struct btrfs_stripe_hash_table {
1329 struct list_head stripe_cache;
1330 spinlock_t cache_lock;
1332 struct btrfs_stripe_hash table[];
1335 #define BTRFS_STRIPE_HASH_TABLE_BITS 11
1337 void btrfs_init_async_reclaim_work(struct work_struct *work);
1340 struct reloc_control;
1341 struct btrfs_device;
1342 struct btrfs_fs_devices;
1343 struct btrfs_balance_control;
1344 struct btrfs_delayed_root;
1345 struct btrfs_fs_info {
1346 u8 fsid[BTRFS_FSID_SIZE];
1347 u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
1348 struct btrfs_root *extent_root;
1349 struct btrfs_root *tree_root;
1350 struct btrfs_root *chunk_root;
1351 struct btrfs_root *dev_root;
1352 struct btrfs_root *fs_root;
1353 struct btrfs_root *csum_root;
1354 struct btrfs_root *quota_root;
1355 struct btrfs_root *uuid_root;
1357 /* the log root tree is a directory of all the other log roots */
1358 struct btrfs_root *log_root_tree;
1360 spinlock_t fs_roots_radix_lock;
1361 struct radix_tree_root fs_roots_radix;
1363 /* block group cache stuff */
1364 spinlock_t block_group_cache_lock;
1365 u64 first_logical_byte;
1366 struct rb_root block_group_cache_tree;
1368 /* keep track of unallocated space */
1369 spinlock_t free_chunk_lock;
1370 u64 free_chunk_space;
1372 struct extent_io_tree freed_extents[2];
1373 struct extent_io_tree *pinned_extents;
1375 /* logical->physical extent mapping */
1376 struct btrfs_mapping_tree mapping_tree;
1379 * block reservation for extent, checksum, root tree and
1380 * delayed dir index item
1382 struct btrfs_block_rsv global_block_rsv;
1383 /* block reservation for delay allocation */
1384 struct btrfs_block_rsv delalloc_block_rsv;
1385 /* block reservation for metadata operations */
1386 struct btrfs_block_rsv trans_block_rsv;
1387 /* block reservation for chunk tree */
1388 struct btrfs_block_rsv chunk_block_rsv;
1389 /* block reservation for delayed operations */
1390 struct btrfs_block_rsv delayed_block_rsv;
1392 struct btrfs_block_rsv empty_block_rsv;
1395 u64 last_trans_committed;
1396 u64 avg_delayed_ref_runtime;
1399 * this is updated to the current trans every time a full commit
1400 * is required instead of the faster short fsync log commits
1402 u64 last_trans_log_full_commit;
1403 unsigned long mount_opt;
1404 unsigned long compress_type:4;
1405 int commit_interval;
1407 * It is a suggestive number, the read side is safe even it gets a
1408 * wrong number because we will write out the data into a regular
1409 * extent. The write side(mount/remount) is under ->s_umount lock,
1410 * so it is also safe.
1414 * Protected by ->chunk_mutex and sb->s_umount.
1416 * The reason that we use two lock to protect it is because only
1417 * remount and mount operations can change it and these two operations
1418 * are under sb->s_umount, but the read side (chunk allocation) can not
1419 * acquire sb->s_umount or the deadlock would happen. So we use two
1420 * locks to protect it. On the write side, we must acquire two locks,
1421 * and on the read side, we just need acquire one of them.
1424 struct btrfs_transaction *running_transaction;
1425 wait_queue_head_t transaction_throttle;
1426 wait_queue_head_t transaction_wait;
1427 wait_queue_head_t transaction_blocked_wait;
1428 wait_queue_head_t async_submit_wait;
1431 * Used to protect the incompat_flags, compat_flags, compat_ro_flags
1432 * when they are updated.
1434 * Because we do not clear the flags for ever, so we needn't use
1435 * the lock on the read side.
1437 * We also needn't use the lock when we mount the fs, because
1438 * there is no other task which will update the flag.
1440 spinlock_t super_lock;
1441 struct btrfs_super_block *super_copy;
1442 struct btrfs_super_block *super_for_commit;
1443 struct block_device *__bdev;
1444 struct super_block *sb;
1445 struct inode *btree_inode;
1446 struct backing_dev_info bdi;
1447 struct mutex tree_log_mutex;
1448 struct mutex transaction_kthread_mutex;
1449 struct mutex cleaner_mutex;
1450 struct mutex chunk_mutex;
1451 struct mutex volume_mutex;
1453 /* this is used during read/modify/write to make sure
1454 * no two ios are trying to mod the same stripe at the same
1457 struct btrfs_stripe_hash_table *stripe_hash_table;
1460 * this protects the ordered operations list only while we are
1461 * processing all of the entries on it. This way we make
1462 * sure the commit code doesn't find the list temporarily empty
1463 * because another function happens to be doing non-waiting preflush
1464 * before jumping into the main commit.
1466 struct mutex ordered_operations_mutex;
1469 * Same as ordered_operations_mutex except this is for ordered extents
1470 * and not the operations.
1472 struct mutex ordered_extent_flush_mutex;
1474 struct rw_semaphore commit_root_sem;
1476 struct rw_semaphore cleanup_work_sem;
1478 struct rw_semaphore subvol_sem;
1479 struct srcu_struct subvol_srcu;
1481 spinlock_t trans_lock;
1483 * the reloc mutex goes with the trans lock, it is taken
1484 * during commit to protect us from the relocation code
1486 struct mutex reloc_mutex;
1488 struct list_head trans_list;
1489 struct list_head dead_roots;
1490 struct list_head caching_block_groups;
1492 spinlock_t delayed_iput_lock;
1493 struct list_head delayed_iputs;
1495 /* this protects tree_mod_seq_list */
1496 spinlock_t tree_mod_seq_lock;
1497 atomic64_t tree_mod_seq;
1498 struct list_head tree_mod_seq_list;
1500 /* this protects tree_mod_log */
1501 rwlock_t tree_mod_log_lock;
1502 struct rb_root tree_mod_log;
1504 atomic_t nr_async_submits;
1505 atomic_t async_submit_draining;
1506 atomic_t nr_async_bios;
1507 atomic_t async_delalloc_pages;
1508 atomic_t open_ioctl_trans;
1511 * this is used to protect the following list -- ordered_roots.
1513 spinlock_t ordered_root_lock;
1516 * all fs/file tree roots in which there are data=ordered extents
1517 * pending writeback are added into this list.
1519 * these can span multiple transactions and basically include
1520 * every dirty data page that isn't from nodatacow
1522 struct list_head ordered_roots;
1524 struct mutex delalloc_root_mutex;
1525 spinlock_t delalloc_root_lock;
1526 /* all fs/file tree roots that have delalloc inodes. */
1527 struct list_head delalloc_roots;
1530 * there is a pool of worker threads for checksumming during writes
1531 * and a pool for checksumming after reads. This is because readers
1532 * can run with FS locks held, and the writers may be waiting for
1533 * those locks. We don't want ordering in the pending list to cause
1534 * deadlocks, and so the two are serviced separately.
1536 * A third pool does submit_bio to avoid deadlocking with the other
1539 struct btrfs_workqueue *workers;
1540 struct btrfs_workqueue *delalloc_workers;
1541 struct btrfs_workqueue *flush_workers;
1542 struct btrfs_workqueue *endio_workers;
1543 struct btrfs_workqueue *endio_meta_workers;
1544 struct btrfs_workqueue *endio_raid56_workers;
1545 struct btrfs_workqueue *endio_repair_workers;
1546 struct btrfs_workqueue *rmw_workers;
1547 struct btrfs_workqueue *endio_meta_write_workers;
1548 struct btrfs_workqueue *endio_write_workers;
1549 struct btrfs_workqueue *endio_freespace_worker;
1550 struct btrfs_workqueue *submit_workers;
1551 struct btrfs_workqueue *caching_workers;
1552 struct btrfs_workqueue *readahead_workers;
1555 * fixup workers take dirty pages that didn't properly go through
1556 * the cow mechanism and make them safe to write. It happens
1557 * for the sys_munmap function call path
1559 struct btrfs_workqueue *fixup_workers;
1560 struct btrfs_workqueue *delayed_workers;
1562 /* the extent workers do delayed refs on the extent allocation tree */
1563 struct btrfs_workqueue *extent_workers;
1564 struct task_struct *transaction_kthread;
1565 struct task_struct *cleaner_kthread;
1566 int thread_pool_size;
1568 struct kobject super_kobj;
1569 struct kobject *space_info_kobj;
1570 struct kobject *device_dir_kobj;
1571 struct completion kobj_unregister;
1574 int log_root_recovering;
1579 /* used to keep from writing metadata until there is a nice batch */
1580 struct percpu_counter dirty_metadata_bytes;
1581 struct percpu_counter delalloc_bytes;
1582 s32 dirty_metadata_batch;
1585 struct list_head dirty_cowonly_roots;
1587 struct btrfs_fs_devices *fs_devices;
1590 * the space_info list is almost entirely read only. It only changes
1591 * when we add a new raid type to the FS, and that happens
1592 * very rarely. RCU is used to protect it.
1594 struct list_head space_info;
1596 struct btrfs_space_info *data_sinfo;
1598 struct reloc_control *reloc_ctl;
1600 /* data_alloc_cluster is only used in ssd mode */
1601 struct btrfs_free_cluster data_alloc_cluster;
1603 /* all metadata allocations go through this cluster */
1604 struct btrfs_free_cluster meta_alloc_cluster;
1606 /* auto defrag inodes go here */
1607 spinlock_t defrag_inodes_lock;
1608 struct rb_root defrag_inodes;
1609 atomic_t defrag_running;
1611 /* Used to protect avail_{data, metadata, system}_alloc_bits */
1612 seqlock_t profiles_lock;
1614 * these three are in extended format (availability of single
1615 * chunks is denoted by BTRFS_AVAIL_ALLOC_BIT_SINGLE bit, other
1616 * types are denoted by corresponding BTRFS_BLOCK_GROUP_* bits)
1618 u64 avail_data_alloc_bits;
1619 u64 avail_metadata_alloc_bits;
1620 u64 avail_system_alloc_bits;
1622 /* restriper state */
1623 spinlock_t balance_lock;
1624 struct mutex balance_mutex;
1625 atomic_t balance_running;
1626 atomic_t balance_pause_req;
1627 atomic_t balance_cancel_req;
1628 struct btrfs_balance_control *balance_ctl;
1629 wait_queue_head_t balance_wait_q;
1631 unsigned data_chunk_allocations;
1632 unsigned metadata_ratio;
1636 /* private scrub information */
1637 struct mutex scrub_lock;
1638 atomic_t scrubs_running;
1639 atomic_t scrub_pause_req;
1640 atomic_t scrubs_paused;
1641 atomic_t scrub_cancel_req;
1642 wait_queue_head_t scrub_pause_wait;
1643 int scrub_workers_refcnt;
1644 struct btrfs_workqueue *scrub_workers;
1645 struct btrfs_workqueue *scrub_wr_completion_workers;
1646 struct btrfs_workqueue *scrub_nocow_workers;
1648 #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY
1649 u32 check_integrity_print_mask;
1654 unsigned int quota_enabled:1;
1657 * quota_enabled only changes state after a commit. This holds the
1660 unsigned int pending_quota_state:1;
1662 /* is qgroup tracking in a consistent state? */
1665 /* holds configuration and tracking. Protected by qgroup_lock */
1666 struct rb_root qgroup_tree;
1667 struct rb_root qgroup_op_tree;
1668 spinlock_t qgroup_lock;
1669 spinlock_t qgroup_op_lock;
1670 atomic_t qgroup_op_seq;
1673 * used to avoid frequently calling ulist_alloc()/ulist_free()
1674 * when doing qgroup accounting, it must be protected by qgroup_lock.
1676 struct ulist *qgroup_ulist;
1678 /* protect user change for quota operations */
1679 struct mutex qgroup_ioctl_lock;
1681 /* list of dirty qgroups to be written at next commit */
1682 struct list_head dirty_qgroups;
1684 /* used by btrfs_qgroup_record_ref for an efficient tree traversal */
1687 /* qgroup rescan items */
1688 struct mutex qgroup_rescan_lock; /* protects the progress item */
1689 struct btrfs_key qgroup_rescan_progress;
1690 struct btrfs_workqueue *qgroup_rescan_workers;
1691 struct completion qgroup_rescan_completion;
1692 struct btrfs_work qgroup_rescan_work;
1694 /* filesystem state */
1695 unsigned long fs_state;
1697 struct btrfs_delayed_root *delayed_root;
1699 /* readahead tree */
1700 spinlock_t reada_lock;
1701 struct radix_tree_root reada_tree;
1703 /* Extent buffer radix tree */
1704 spinlock_t buffer_lock;
1705 struct radix_tree_root buffer_radix;
1707 /* next backup root to be overwritten */
1708 int backup_root_index;
1710 int num_tolerated_disk_barrier_failures;
1712 /* device replace state */
1713 struct btrfs_dev_replace dev_replace;
1715 atomic_t mutually_exclusive_operation_running;
1717 struct percpu_counter bio_counter;
1718 wait_queue_head_t replace_wait;
1720 struct semaphore uuid_tree_rescan_sem;
1721 unsigned int update_uuid_tree_gen:1;
1723 /* Used to reclaim the metadata space in the background. */
1724 struct work_struct async_reclaim_work;
1726 spinlock_t unused_bgs_lock;
1727 struct list_head unused_bgs;
1730 struct btrfs_subvolume_writers {
1731 struct percpu_counter counter;
1732 wait_queue_head_t wait;
1736 * The state of btrfs root
1739 * btrfs_record_root_in_trans is a multi-step process,
1740 * and it can race with the balancing code. But the
1741 * race is very small, and only the first time the root
1742 * is added to each transaction. So IN_TRANS_SETUP
1743 * is used to tell us when more checks are required
1745 #define BTRFS_ROOT_IN_TRANS_SETUP 0
1746 #define BTRFS_ROOT_REF_COWS 1
1747 #define BTRFS_ROOT_TRACK_DIRTY 2
1748 #define BTRFS_ROOT_IN_RADIX 3
1749 #define BTRFS_ROOT_DUMMY_ROOT 4
1750 #define BTRFS_ROOT_ORPHAN_ITEM_INSERTED 5
1751 #define BTRFS_ROOT_DEFRAG_RUNNING 6
1752 #define BTRFS_ROOT_FORCE_COW 7
1753 #define BTRFS_ROOT_MULTI_LOG_TASKS 8
1756 * in ram representation of the tree. extent_root is used for all allocations
1757 * and for the extent tree extent_root root.
1760 struct extent_buffer *node;
1762 struct extent_buffer *commit_root;
1763 struct btrfs_root *log_root;
1764 struct btrfs_root *reloc_root;
1766 unsigned long state;
1767 struct btrfs_root_item root_item;
1768 struct btrfs_key root_key;
1769 struct btrfs_fs_info *fs_info;
1770 struct extent_io_tree dirty_log_pages;
1772 struct kobject root_kobj;
1773 struct completion kobj_unregister;
1774 struct mutex objectid_mutex;
1776 spinlock_t accounting_lock;
1777 struct btrfs_block_rsv *block_rsv;
1779 /* free ino cache stuff */
1780 struct btrfs_free_space_ctl *free_ino_ctl;
1781 enum btrfs_caching_type ino_cache_state;
1782 spinlock_t ino_cache_lock;
1783 wait_queue_head_t ino_cache_wait;
1784 struct btrfs_free_space_ctl *free_ino_pinned;
1785 u64 ino_cache_progress;
1786 struct inode *ino_cache_inode;
1788 struct mutex log_mutex;
1789 wait_queue_head_t log_writer_wait;
1790 wait_queue_head_t log_commit_wait[2];
1791 struct list_head log_ctxs[2];
1792 atomic_t log_writers;
1793 atomic_t log_commit[2];
1796 /* No matter the commit succeeds or not*/
1797 int log_transid_committed;
1798 /* Just be updated when the commit succeeds. */
1799 int last_log_commit;
1800 pid_t log_start_pid;
1805 /* data allocations are done in sectorsize units */
1808 /* node allocations are done in nodesize units */
1815 u64 highest_objectid;
1817 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
1821 u64 defrag_trans_start;
1822 struct btrfs_key defrag_progress;
1823 struct btrfs_key defrag_max;
1826 /* the dirty list is only used by non-reference counted roots */
1827 struct list_head dirty_list;
1829 struct list_head root_list;
1831 spinlock_t log_extents_lock[2];
1832 struct list_head logged_list[2];
1834 spinlock_t orphan_lock;
1835 atomic_t orphan_inodes;
1836 struct btrfs_block_rsv *orphan_block_rsv;
1837 int orphan_cleanup_state;
1839 spinlock_t inode_lock;
1840 /* red-black tree that keeps track of in-memory inodes */
1841 struct rb_root inode_tree;
1844 * radix tree that keeps track of delayed nodes of every inode,
1845 * protected by inode_lock
1847 struct radix_tree_root delayed_nodes_tree;
1849 * right now this just gets used so that a root has its own devid
1850 * for stat. It may be used for more later
1854 spinlock_t root_item_lock;
1857 struct mutex delalloc_mutex;
1858 spinlock_t delalloc_lock;
1860 * all of the inodes that have delalloc bytes. It is possible for
1861 * this list to be empty even when there is still dirty data=ordered
1862 * extents waiting to finish IO.
1864 struct list_head delalloc_inodes;
1865 struct list_head delalloc_root;
1866 u64 nr_delalloc_inodes;
1868 struct mutex ordered_extent_mutex;
1870 * this is used by the balancing code to wait for all the pending
1873 spinlock_t ordered_extent_lock;
1876 * all of the data=ordered extents pending writeback
1877 * these can span multiple transactions and basically include
1878 * every dirty data page that isn't from nodatacow
1880 struct list_head ordered_extents;
1881 struct list_head ordered_root;
1882 u64 nr_ordered_extents;
1885 * Number of currently running SEND ioctls to prevent
1886 * manipulation with the read-only status via SUBVOL_SETFLAGS
1888 int send_in_progress;
1889 struct btrfs_subvolume_writers *subv_writers;
1890 atomic_t will_be_snapshoted;
1893 struct btrfs_ioctl_defrag_range_args {
1894 /* start of the defrag operation */
1897 /* number of bytes to defrag, use (u64)-1 to say all */
1901 * flags for the operation, which can include turning
1902 * on compression for this one defrag
1907 * any extent bigger than this will be considered
1908 * already defragged. Use 0 to take the kernel default
1909 * Use 1 to say every single extent must be rewritten
1911 __u32 extent_thresh;
1914 * which compression method to use if turning on compression
1915 * for this defrag operation. If unspecified, zlib will
1918 __u32 compress_type;
1920 /* spare for later */
1926 * inode items have the data typically returned from stat and store other
1927 * info about object characteristics. There is one for every file and dir in
1930 #define BTRFS_INODE_ITEM_KEY 1
1931 #define BTRFS_INODE_REF_KEY 12
1932 #define BTRFS_INODE_EXTREF_KEY 13
1933 #define BTRFS_XATTR_ITEM_KEY 24
1934 #define BTRFS_ORPHAN_ITEM_KEY 48
1935 /* reserve 2-15 close to the inode for later flexibility */
1938 * dir items are the name -> inode pointers in a directory. There is one
1939 * for every name in a directory.
1941 #define BTRFS_DIR_LOG_ITEM_KEY 60
1942 #define BTRFS_DIR_LOG_INDEX_KEY 72
1943 #define BTRFS_DIR_ITEM_KEY 84
1944 #define BTRFS_DIR_INDEX_KEY 96
1946 * extent data is for file data
1948 #define BTRFS_EXTENT_DATA_KEY 108
1951 * extent csums are stored in a separate tree and hold csums for
1952 * an entire extent on disk.
1954 #define BTRFS_EXTENT_CSUM_KEY 128
1957 * root items point to tree roots. They are typically in the root
1958 * tree used by the super block to find all the other trees
1960 #define BTRFS_ROOT_ITEM_KEY 132
1963 * root backrefs tie subvols and snapshots to the directory entries that
1966 #define BTRFS_ROOT_BACKREF_KEY 144
1969 * root refs make a fast index for listing all of the snapshots and
1970 * subvolumes referenced by a given root. They point directly to the
1971 * directory item in the root that references the subvol
1973 #define BTRFS_ROOT_REF_KEY 156
1976 * extent items are in the extent map tree. These record which blocks
1977 * are used, and how many references there are to each block
1979 #define BTRFS_EXTENT_ITEM_KEY 168
1982 * The same as the BTRFS_EXTENT_ITEM_KEY, except it's metadata we already know
1983 * the length, so we save the level in key->offset instead of the length.
1985 #define BTRFS_METADATA_ITEM_KEY 169
1987 #define BTRFS_TREE_BLOCK_REF_KEY 176
1989 #define BTRFS_EXTENT_DATA_REF_KEY 178
1991 #define BTRFS_EXTENT_REF_V0_KEY 180
1993 #define BTRFS_SHARED_BLOCK_REF_KEY 182
1995 #define BTRFS_SHARED_DATA_REF_KEY 184
1998 * block groups give us hints into the extent allocation trees. Which
1999 * blocks are free etc etc
2001 #define BTRFS_BLOCK_GROUP_ITEM_KEY 192
2003 #define BTRFS_DEV_EXTENT_KEY 204
2004 #define BTRFS_DEV_ITEM_KEY 216
2005 #define BTRFS_CHUNK_ITEM_KEY 228
2008 * Records the overall state of the qgroups.
2009 * There's only one instance of this key present,
2010 * (0, BTRFS_QGROUP_STATUS_KEY, 0)
2012 #define BTRFS_QGROUP_STATUS_KEY 240
2014 * Records the currently used space of the qgroup.
2015 * One key per qgroup, (0, BTRFS_QGROUP_INFO_KEY, qgroupid).
2017 #define BTRFS_QGROUP_INFO_KEY 242
2019 * Contains the user configured limits for the qgroup.
2020 * One key per qgroup, (0, BTRFS_QGROUP_LIMIT_KEY, qgroupid).
2022 #define BTRFS_QGROUP_LIMIT_KEY 244
2024 * Records the child-parent relationship of qgroups. For
2025 * each relation, 2 keys are present:
2026 * (childid, BTRFS_QGROUP_RELATION_KEY, parentid)
2027 * (parentid, BTRFS_QGROUP_RELATION_KEY, childid)
2029 #define BTRFS_QGROUP_RELATION_KEY 246
2031 #define BTRFS_BALANCE_ITEM_KEY 248
2034 * Persistantly stores the io stats in the device tree.
2035 * One key for all stats, (0, BTRFS_DEV_STATS_KEY, devid).
2037 #define BTRFS_DEV_STATS_KEY 249
2040 * Persistantly stores the device replace state in the device tree.
2041 * The key is built like this: (0, BTRFS_DEV_REPLACE_KEY, 0).
2043 #define BTRFS_DEV_REPLACE_KEY 250
2046 * Stores items that allow to quickly map UUIDs to something else.
2047 * These items are part of the filesystem UUID tree.
2048 * The key is built like this:
2049 * (UUID_upper_64_bits, BTRFS_UUID_KEY*, UUID_lower_64_bits).
2051 #if BTRFS_UUID_SIZE != 16
2052 #error "UUID items require BTRFS_UUID_SIZE == 16!"
2054 #define BTRFS_UUID_KEY_SUBVOL 251 /* for UUIDs assigned to subvols */
2055 #define BTRFS_UUID_KEY_RECEIVED_SUBVOL 252 /* for UUIDs assigned to
2056 * received subvols */
2059 * string items are for debugging. They just store a short string of
2062 #define BTRFS_STRING_ITEM_KEY 253
2065 * Flags for mount options.
2067 * Note: don't forget to add new options to btrfs_show_options()
2069 #define BTRFS_MOUNT_NODATASUM (1 << 0)
2070 #define BTRFS_MOUNT_NODATACOW (1 << 1)
2071 #define BTRFS_MOUNT_NOBARRIER (1 << 2)
2072 #define BTRFS_MOUNT_SSD (1 << 3)
2073 #define BTRFS_MOUNT_DEGRADED (1 << 4)
2074 #define BTRFS_MOUNT_COMPRESS (1 << 5)
2075 #define BTRFS_MOUNT_NOTREELOG (1 << 6)
2076 #define BTRFS_MOUNT_FLUSHONCOMMIT (1 << 7)
2077 #define BTRFS_MOUNT_SSD_SPREAD (1 << 8)
2078 #define BTRFS_MOUNT_NOSSD (1 << 9)
2079 #define BTRFS_MOUNT_DISCARD (1 << 10)
2080 #define BTRFS_MOUNT_FORCE_COMPRESS (1 << 11)
2081 #define BTRFS_MOUNT_SPACE_CACHE (1 << 12)
2082 #define BTRFS_MOUNT_CLEAR_CACHE (1 << 13)
2083 #define BTRFS_MOUNT_USER_SUBVOL_RM_ALLOWED (1 << 14)
2084 #define BTRFS_MOUNT_ENOSPC_DEBUG (1 << 15)
2085 #define BTRFS_MOUNT_AUTO_DEFRAG (1 << 16)
2086 #define BTRFS_MOUNT_INODE_MAP_CACHE (1 << 17)
2087 #define BTRFS_MOUNT_RECOVERY (1 << 18)
2088 #define BTRFS_MOUNT_SKIP_BALANCE (1 << 19)
2089 #define BTRFS_MOUNT_CHECK_INTEGRITY (1 << 20)
2090 #define BTRFS_MOUNT_CHECK_INTEGRITY_INCLUDING_EXTENT_DATA (1 << 21)
2091 #define BTRFS_MOUNT_PANIC_ON_FATAL_ERROR (1 << 22)
2092 #define BTRFS_MOUNT_RESCAN_UUID_TREE (1 << 23)
2093 #define BTRFS_MOUNT_CHANGE_INODE_CACHE (1 << 24)
2095 #define BTRFS_DEFAULT_COMMIT_INTERVAL (30)
2096 #define BTRFS_DEFAULT_MAX_INLINE (8192)
2098 #define btrfs_clear_opt(o, opt) ((o) &= ~BTRFS_MOUNT_##opt)
2099 #define btrfs_set_opt(o, opt) ((o) |= BTRFS_MOUNT_##opt)
2100 #define btrfs_raw_test_opt(o, opt) ((o) & BTRFS_MOUNT_##opt)
2101 #define btrfs_test_opt(root, opt) ((root)->fs_info->mount_opt & \
2103 #define btrfs_set_and_info(root, opt, fmt, args...) \
2105 if (!btrfs_test_opt(root, opt)) \
2106 btrfs_info(root->fs_info, fmt, ##args); \
2107 btrfs_set_opt(root->fs_info->mount_opt, opt); \
2110 #define btrfs_clear_and_info(root, opt, fmt, args...) \
2112 if (btrfs_test_opt(root, opt)) \
2113 btrfs_info(root->fs_info, fmt, ##args); \
2114 btrfs_clear_opt(root->fs_info->mount_opt, opt); \
2120 #define BTRFS_INODE_NODATASUM (1 << 0)
2121 #define BTRFS_INODE_NODATACOW (1 << 1)
2122 #define BTRFS_INODE_READONLY (1 << 2)
2123 #define BTRFS_INODE_NOCOMPRESS (1 << 3)
2124 #define BTRFS_INODE_PREALLOC (1 << 4)
2125 #define BTRFS_INODE_SYNC (1 << 5)
2126 #define BTRFS_INODE_IMMUTABLE (1 << 6)
2127 #define BTRFS_INODE_APPEND (1 << 7)
2128 #define BTRFS_INODE_NODUMP (1 << 8)
2129 #define BTRFS_INODE_NOATIME (1 << 9)
2130 #define BTRFS_INODE_DIRSYNC (1 << 10)
2131 #define BTRFS_INODE_COMPRESS (1 << 11)
2133 #define BTRFS_INODE_ROOT_ITEM_INIT (1 << 31)
2135 struct btrfs_map_token {
2136 struct extent_buffer *eb;
2138 unsigned long offset;
2141 static inline void btrfs_init_map_token (struct btrfs_map_token *token)
2143 token->kaddr = NULL;
2146 /* some macros to generate set/get funcs for the struct fields. This
2147 * assumes there is a lefoo_to_cpu for every type, so lets make a simple
2150 #define le8_to_cpu(v) (v)
2151 #define cpu_to_le8(v) (v)
2154 #define read_eb_member(eb, ptr, type, member, result) ( \
2155 read_extent_buffer(eb, (char *)(result), \
2156 ((unsigned long)(ptr)) + \
2157 offsetof(type, member), \
2158 sizeof(((type *)0)->member)))
2160 #define write_eb_member(eb, ptr, type, member, result) ( \
2161 write_extent_buffer(eb, (char *)(result), \
2162 ((unsigned long)(ptr)) + \
2163 offsetof(type, member), \
2164 sizeof(((type *)0)->member)))
2166 #define DECLARE_BTRFS_SETGET_BITS(bits) \
2167 u##bits btrfs_get_token_##bits(struct extent_buffer *eb, void *ptr, \
2168 unsigned long off, \
2169 struct btrfs_map_token *token); \
2170 void btrfs_set_token_##bits(struct extent_buffer *eb, void *ptr, \
2171 unsigned long off, u##bits val, \
2172 struct btrfs_map_token *token); \
2173 static inline u##bits btrfs_get_##bits(struct extent_buffer *eb, void *ptr, \
2174 unsigned long off) \
2176 return btrfs_get_token_##bits(eb, ptr, off, NULL); \
2178 static inline void btrfs_set_##bits(struct extent_buffer *eb, void *ptr, \
2179 unsigned long off, u##bits val) \
2181 btrfs_set_token_##bits(eb, ptr, off, val, NULL); \
2184 DECLARE_BTRFS_SETGET_BITS(8)
2185 DECLARE_BTRFS_SETGET_BITS(16)
2186 DECLARE_BTRFS_SETGET_BITS(32)
2187 DECLARE_BTRFS_SETGET_BITS(64)
2189 #define BTRFS_SETGET_FUNCS(name, type, member, bits) \
2190 static inline u##bits btrfs_##name(struct extent_buffer *eb, type *s) \
2192 BUILD_BUG_ON(sizeof(u##bits) != sizeof(((type *)0))->member); \
2193 return btrfs_get_##bits(eb, s, offsetof(type, member)); \
2195 static inline void btrfs_set_##name(struct extent_buffer *eb, type *s, \
2198 BUILD_BUG_ON(sizeof(u##bits) != sizeof(((type *)0))->member); \
2199 btrfs_set_##bits(eb, s, offsetof(type, member), val); \
2201 static inline u##bits btrfs_token_##name(struct extent_buffer *eb, type *s, \
2202 struct btrfs_map_token *token) \
2204 BUILD_BUG_ON(sizeof(u##bits) != sizeof(((type *)0))->member); \
2205 return btrfs_get_token_##bits(eb, s, offsetof(type, member), token); \
2207 static inline void btrfs_set_token_##name(struct extent_buffer *eb, \
2208 type *s, u##bits val, \
2209 struct btrfs_map_token *token) \
2211 BUILD_BUG_ON(sizeof(u##bits) != sizeof(((type *)0))->member); \
2212 btrfs_set_token_##bits(eb, s, offsetof(type, member), val, token); \
2215 #define BTRFS_SETGET_HEADER_FUNCS(name, type, member, bits) \
2216 static inline u##bits btrfs_##name(struct extent_buffer *eb) \
2218 type *p = page_address(eb->pages[0]); \
2219 u##bits res = le##bits##_to_cpu(p->member); \
2222 static inline void btrfs_set_##name(struct extent_buffer *eb, \
2225 type *p = page_address(eb->pages[0]); \
2226 p->member = cpu_to_le##bits(val); \
2229 #define BTRFS_SETGET_STACK_FUNCS(name, type, member, bits) \
2230 static inline u##bits btrfs_##name(type *s) \
2232 return le##bits##_to_cpu(s->member); \
2234 static inline void btrfs_set_##name(type *s, u##bits val) \
2236 s->member = cpu_to_le##bits(val); \
2239 BTRFS_SETGET_FUNCS(device_type, struct btrfs_dev_item, type, 64);
2240 BTRFS_SETGET_FUNCS(device_total_bytes, struct btrfs_dev_item, total_bytes, 64);
2241 BTRFS_SETGET_FUNCS(device_bytes_used, struct btrfs_dev_item, bytes_used, 64);
2242 BTRFS_SETGET_FUNCS(device_io_align, struct btrfs_dev_item, io_align, 32);
2243 BTRFS_SETGET_FUNCS(device_io_width, struct btrfs_dev_item, io_width, 32);
2244 BTRFS_SETGET_FUNCS(device_start_offset, struct btrfs_dev_item,
2246 BTRFS_SETGET_FUNCS(device_sector_size, struct btrfs_dev_item, sector_size, 32);
2247 BTRFS_SETGET_FUNCS(device_id, struct btrfs_dev_item, devid, 64);
2248 BTRFS_SETGET_FUNCS(device_group, struct btrfs_dev_item, dev_group, 32);
2249 BTRFS_SETGET_FUNCS(device_seek_speed, struct btrfs_dev_item, seek_speed, 8);
2250 BTRFS_SETGET_FUNCS(device_bandwidth, struct btrfs_dev_item, bandwidth, 8);
2251 BTRFS_SETGET_FUNCS(device_generation, struct btrfs_dev_item, generation, 64);
2253 BTRFS_SETGET_STACK_FUNCS(stack_device_type, struct btrfs_dev_item, type, 64);
2254 BTRFS_SETGET_STACK_FUNCS(stack_device_total_bytes, struct btrfs_dev_item,
2256 BTRFS_SETGET_STACK_FUNCS(stack_device_bytes_used, struct btrfs_dev_item,
2258 BTRFS_SETGET_STACK_FUNCS(stack_device_io_align, struct btrfs_dev_item,
2260 BTRFS_SETGET_STACK_FUNCS(stack_device_io_width, struct btrfs_dev_item,
2262 BTRFS_SETGET_STACK_FUNCS(stack_device_sector_size, struct btrfs_dev_item,
2264 BTRFS_SETGET_STACK_FUNCS(stack_device_id, struct btrfs_dev_item, devid, 64);
2265 BTRFS_SETGET_STACK_FUNCS(stack_device_group, struct btrfs_dev_item,
2267 BTRFS_SETGET_STACK_FUNCS(stack_device_seek_speed, struct btrfs_dev_item,
2269 BTRFS_SETGET_STACK_FUNCS(stack_device_bandwidth, struct btrfs_dev_item,
2271 BTRFS_SETGET_STACK_FUNCS(stack_device_generation, struct btrfs_dev_item,
2274 static inline unsigned long btrfs_device_uuid(struct btrfs_dev_item *d)
2276 return (unsigned long)d + offsetof(struct btrfs_dev_item, uuid);
2279 static inline unsigned long btrfs_device_fsid(struct btrfs_dev_item *d)
2281 return (unsigned long)d + offsetof(struct btrfs_dev_item, fsid);
2284 BTRFS_SETGET_FUNCS(chunk_length, struct btrfs_chunk, length, 64);
2285 BTRFS_SETGET_FUNCS(chunk_owner, struct btrfs_chunk, owner, 64);
2286 BTRFS_SETGET_FUNCS(chunk_stripe_len, struct btrfs_chunk, stripe_len, 64);
2287 BTRFS_SETGET_FUNCS(chunk_io_align, struct btrfs_chunk, io_align, 32);
2288 BTRFS_SETGET_FUNCS(chunk_io_width, struct btrfs_chunk, io_width, 32);
2289 BTRFS_SETGET_FUNCS(chunk_sector_size, struct btrfs_chunk, sector_size, 32);
2290 BTRFS_SETGET_FUNCS(chunk_type, struct btrfs_chunk, type, 64);
2291 BTRFS_SETGET_FUNCS(chunk_num_stripes, struct btrfs_chunk, num_stripes, 16);
2292 BTRFS_SETGET_FUNCS(chunk_sub_stripes, struct btrfs_chunk, sub_stripes, 16);
2293 BTRFS_SETGET_FUNCS(stripe_devid, struct btrfs_stripe, devid, 64);
2294 BTRFS_SETGET_FUNCS(stripe_offset, struct btrfs_stripe, offset, 64);
2296 static inline char *btrfs_stripe_dev_uuid(struct btrfs_stripe *s)
2298 return (char *)s + offsetof(struct btrfs_stripe, dev_uuid);
2301 BTRFS_SETGET_STACK_FUNCS(stack_chunk_length, struct btrfs_chunk, length, 64);
2302 BTRFS_SETGET_STACK_FUNCS(stack_chunk_owner, struct btrfs_chunk, owner, 64);
2303 BTRFS_SETGET_STACK_FUNCS(stack_chunk_stripe_len, struct btrfs_chunk,
2305 BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_align, struct btrfs_chunk,
2307 BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_width, struct btrfs_chunk,
2309 BTRFS_SETGET_STACK_FUNCS(stack_chunk_sector_size, struct btrfs_chunk,
2311 BTRFS_SETGET_STACK_FUNCS(stack_chunk_type, struct btrfs_chunk, type, 64);
2312 BTRFS_SETGET_STACK_FUNCS(stack_chunk_num_stripes, struct btrfs_chunk,
2314 BTRFS_SETGET_STACK_FUNCS(stack_chunk_sub_stripes, struct btrfs_chunk,
2316 BTRFS_SETGET_STACK_FUNCS(stack_stripe_devid, struct btrfs_stripe, devid, 64);
2317 BTRFS_SETGET_STACK_FUNCS(stack_stripe_offset, struct btrfs_stripe, offset, 64);
2319 static inline struct btrfs_stripe *btrfs_stripe_nr(struct btrfs_chunk *c,
2322 unsigned long offset = (unsigned long)c;
2323 offset += offsetof(struct btrfs_chunk, stripe);
2324 offset += nr * sizeof(struct btrfs_stripe);
2325 return (struct btrfs_stripe *)offset;
2328 static inline char *btrfs_stripe_dev_uuid_nr(struct btrfs_chunk *c, int nr)
2330 return btrfs_stripe_dev_uuid(btrfs_stripe_nr(c, nr));
2333 static inline u64 btrfs_stripe_offset_nr(struct extent_buffer *eb,
2334 struct btrfs_chunk *c, int nr)
2336 return btrfs_stripe_offset(eb, btrfs_stripe_nr(c, nr));
2339 static inline u64 btrfs_stripe_devid_nr(struct extent_buffer *eb,
2340 struct btrfs_chunk *c, int nr)
2342 return btrfs_stripe_devid(eb, btrfs_stripe_nr(c, nr));
2345 /* struct btrfs_block_group_item */
2346 BTRFS_SETGET_STACK_FUNCS(block_group_used, struct btrfs_block_group_item,
2348 BTRFS_SETGET_FUNCS(disk_block_group_used, struct btrfs_block_group_item,
2350 BTRFS_SETGET_STACK_FUNCS(block_group_chunk_objectid,
2351 struct btrfs_block_group_item, chunk_objectid, 64);
2353 BTRFS_SETGET_FUNCS(disk_block_group_chunk_objectid,
2354 struct btrfs_block_group_item, chunk_objectid, 64);
2355 BTRFS_SETGET_FUNCS(disk_block_group_flags,
2356 struct btrfs_block_group_item, flags, 64);
2357 BTRFS_SETGET_STACK_FUNCS(block_group_flags,
2358 struct btrfs_block_group_item, flags, 64);
2360 /* struct btrfs_inode_ref */
2361 BTRFS_SETGET_FUNCS(inode_ref_name_len, struct btrfs_inode_ref, name_len, 16);
2362 BTRFS_SETGET_FUNCS(inode_ref_index, struct btrfs_inode_ref, index, 64);
2364 /* struct btrfs_inode_extref */
2365 BTRFS_SETGET_FUNCS(inode_extref_parent, struct btrfs_inode_extref,
2366 parent_objectid, 64);
2367 BTRFS_SETGET_FUNCS(inode_extref_name_len, struct btrfs_inode_extref,
2369 BTRFS_SETGET_FUNCS(inode_extref_index, struct btrfs_inode_extref, index, 64);
2371 /* struct btrfs_inode_item */
2372 BTRFS_SETGET_FUNCS(inode_generation, struct btrfs_inode_item, generation, 64);
2373 BTRFS_SETGET_FUNCS(inode_sequence, struct btrfs_inode_item, sequence, 64);
2374 BTRFS_SETGET_FUNCS(inode_transid, struct btrfs_inode_item, transid, 64);
2375 BTRFS_SETGET_FUNCS(inode_size, struct btrfs_inode_item, size, 64);
2376 BTRFS_SETGET_FUNCS(inode_nbytes, struct btrfs_inode_item, nbytes, 64);
2377 BTRFS_SETGET_FUNCS(inode_block_group, struct btrfs_inode_item, block_group, 64);
2378 BTRFS_SETGET_FUNCS(inode_nlink, struct btrfs_inode_item, nlink, 32);
2379 BTRFS_SETGET_FUNCS(inode_uid, struct btrfs_inode_item, uid, 32);
2380 BTRFS_SETGET_FUNCS(inode_gid, struct btrfs_inode_item, gid, 32);
2381 BTRFS_SETGET_FUNCS(inode_mode, struct btrfs_inode_item, mode, 32);
2382 BTRFS_SETGET_FUNCS(inode_rdev, struct btrfs_inode_item, rdev, 64);
2383 BTRFS_SETGET_FUNCS(inode_flags, struct btrfs_inode_item, flags, 64);
2384 BTRFS_SETGET_STACK_FUNCS(stack_inode_generation, struct btrfs_inode_item,
2386 BTRFS_SETGET_STACK_FUNCS(stack_inode_sequence, struct btrfs_inode_item,
2388 BTRFS_SETGET_STACK_FUNCS(stack_inode_transid, struct btrfs_inode_item,
2390 BTRFS_SETGET_STACK_FUNCS(stack_inode_size, struct btrfs_inode_item, size, 64);
2391 BTRFS_SETGET_STACK_FUNCS(stack_inode_nbytes, struct btrfs_inode_item,
2393 BTRFS_SETGET_STACK_FUNCS(stack_inode_block_group, struct btrfs_inode_item,
2395 BTRFS_SETGET_STACK_FUNCS(stack_inode_nlink, struct btrfs_inode_item, nlink, 32);
2396 BTRFS_SETGET_STACK_FUNCS(stack_inode_uid, struct btrfs_inode_item, uid, 32);
2397 BTRFS_SETGET_STACK_FUNCS(stack_inode_gid, struct btrfs_inode_item, gid, 32);
2398 BTRFS_SETGET_STACK_FUNCS(stack_inode_mode, struct btrfs_inode_item, mode, 32);
2399 BTRFS_SETGET_STACK_FUNCS(stack_inode_rdev, struct btrfs_inode_item, rdev, 64);
2400 BTRFS_SETGET_STACK_FUNCS(stack_inode_flags, struct btrfs_inode_item, flags, 64);
2402 static inline struct btrfs_timespec *
2403 btrfs_inode_atime(struct btrfs_inode_item *inode_item)
2405 unsigned long ptr = (unsigned long)inode_item;
2406 ptr += offsetof(struct btrfs_inode_item, atime);
2407 return (struct btrfs_timespec *)ptr;
2410 static inline struct btrfs_timespec *
2411 btrfs_inode_mtime(struct btrfs_inode_item *inode_item)
2413 unsigned long ptr = (unsigned long)inode_item;
2414 ptr += offsetof(struct btrfs_inode_item, mtime);
2415 return (struct btrfs_timespec *)ptr;
2418 static inline struct btrfs_timespec *
2419 btrfs_inode_ctime(struct btrfs_inode_item *inode_item)
2421 unsigned long ptr = (unsigned long)inode_item;
2422 ptr += offsetof(struct btrfs_inode_item, ctime);
2423 return (struct btrfs_timespec *)ptr;
2426 BTRFS_SETGET_FUNCS(timespec_sec, struct btrfs_timespec, sec, 64);
2427 BTRFS_SETGET_FUNCS(timespec_nsec, struct btrfs_timespec, nsec, 32);
2428 BTRFS_SETGET_STACK_FUNCS(stack_timespec_sec, struct btrfs_timespec, sec, 64);
2429 BTRFS_SETGET_STACK_FUNCS(stack_timespec_nsec, struct btrfs_timespec, nsec, 32);
2431 /* struct btrfs_dev_extent */
2432 BTRFS_SETGET_FUNCS(dev_extent_chunk_tree, struct btrfs_dev_extent,
2434 BTRFS_SETGET_FUNCS(dev_extent_chunk_objectid, struct btrfs_dev_extent,
2435 chunk_objectid, 64);
2436 BTRFS_SETGET_FUNCS(dev_extent_chunk_offset, struct btrfs_dev_extent,
2438 BTRFS_SETGET_FUNCS(dev_extent_length, struct btrfs_dev_extent, length, 64);
2440 static inline unsigned long btrfs_dev_extent_chunk_tree_uuid(struct btrfs_dev_extent *dev)
2442 unsigned long ptr = offsetof(struct btrfs_dev_extent, chunk_tree_uuid);
2443 return (unsigned long)dev + ptr;
2446 BTRFS_SETGET_FUNCS(extent_refs, struct btrfs_extent_item, refs, 64);
2447 BTRFS_SETGET_FUNCS(extent_generation, struct btrfs_extent_item,
2449 BTRFS_SETGET_FUNCS(extent_flags, struct btrfs_extent_item, flags, 64);
2451 BTRFS_SETGET_FUNCS(extent_refs_v0, struct btrfs_extent_item_v0, refs, 32);
2454 BTRFS_SETGET_FUNCS(tree_block_level, struct btrfs_tree_block_info, level, 8);
2456 static inline void btrfs_tree_block_key(struct extent_buffer *eb,
2457 struct btrfs_tree_block_info *item,
2458 struct btrfs_disk_key *key)
2460 read_eb_member(eb, item, struct btrfs_tree_block_info, key, key);
2463 static inline void btrfs_set_tree_block_key(struct extent_buffer *eb,
2464 struct btrfs_tree_block_info *item,
2465 struct btrfs_disk_key *key)
2467 write_eb_member(eb, item, struct btrfs_tree_block_info, key, key);
2470 BTRFS_SETGET_FUNCS(extent_data_ref_root, struct btrfs_extent_data_ref,
2472 BTRFS_SETGET_FUNCS(extent_data_ref_objectid, struct btrfs_extent_data_ref,
2474 BTRFS_SETGET_FUNCS(extent_data_ref_offset, struct btrfs_extent_data_ref,
2476 BTRFS_SETGET_FUNCS(extent_data_ref_count, struct btrfs_extent_data_ref,
2479 BTRFS_SETGET_FUNCS(shared_data_ref_count, struct btrfs_shared_data_ref,
2482 BTRFS_SETGET_FUNCS(extent_inline_ref_type, struct btrfs_extent_inline_ref,
2484 BTRFS_SETGET_FUNCS(extent_inline_ref_offset, struct btrfs_extent_inline_ref,
2487 static inline u32 btrfs_extent_inline_ref_size(int type)
2489 if (type == BTRFS_TREE_BLOCK_REF_KEY ||
2490 type == BTRFS_SHARED_BLOCK_REF_KEY)
2491 return sizeof(struct btrfs_extent_inline_ref);
2492 if (type == BTRFS_SHARED_DATA_REF_KEY)
2493 return sizeof(struct btrfs_shared_data_ref) +
2494 sizeof(struct btrfs_extent_inline_ref);
2495 if (type == BTRFS_EXTENT_DATA_REF_KEY)
2496 return sizeof(struct btrfs_extent_data_ref) +
2497 offsetof(struct btrfs_extent_inline_ref, offset);
2502 BTRFS_SETGET_FUNCS(ref_root_v0, struct btrfs_extent_ref_v0, root, 64);
2503 BTRFS_SETGET_FUNCS(ref_generation_v0, struct btrfs_extent_ref_v0,
2505 BTRFS_SETGET_FUNCS(ref_objectid_v0, struct btrfs_extent_ref_v0, objectid, 64);
2506 BTRFS_SETGET_FUNCS(ref_count_v0, struct btrfs_extent_ref_v0, count, 32);
2508 /* struct btrfs_node */
2509 BTRFS_SETGET_FUNCS(key_blockptr, struct btrfs_key_ptr, blockptr, 64);
2510 BTRFS_SETGET_FUNCS(key_generation, struct btrfs_key_ptr, generation, 64);
2511 BTRFS_SETGET_STACK_FUNCS(stack_key_blockptr, struct btrfs_key_ptr,
2513 BTRFS_SETGET_STACK_FUNCS(stack_key_generation, struct btrfs_key_ptr,
2516 static inline u64 btrfs_node_blockptr(struct extent_buffer *eb, int nr)
2519 ptr = offsetof(struct btrfs_node, ptrs) +
2520 sizeof(struct btrfs_key_ptr) * nr;
2521 return btrfs_key_blockptr(eb, (struct btrfs_key_ptr *)ptr);
2524 static inline void btrfs_set_node_blockptr(struct extent_buffer *eb,
2528 ptr = offsetof(struct btrfs_node, ptrs) +
2529 sizeof(struct btrfs_key_ptr) * nr;
2530 btrfs_set_key_blockptr(eb, (struct btrfs_key_ptr *)ptr, val);
2533 static inline u64 btrfs_node_ptr_generation(struct extent_buffer *eb, int nr)
2536 ptr = offsetof(struct btrfs_node, ptrs) +
2537 sizeof(struct btrfs_key_ptr) * nr;
2538 return btrfs_key_generation(eb, (struct btrfs_key_ptr *)ptr);
2541 static inline void btrfs_set_node_ptr_generation(struct extent_buffer *eb,
2545 ptr = offsetof(struct btrfs_node, ptrs) +
2546 sizeof(struct btrfs_key_ptr) * nr;
2547 btrfs_set_key_generation(eb, (struct btrfs_key_ptr *)ptr, val);
2550 static inline unsigned long btrfs_node_key_ptr_offset(int nr)
2552 return offsetof(struct btrfs_node, ptrs) +
2553 sizeof(struct btrfs_key_ptr) * nr;
2556 void btrfs_node_key(struct extent_buffer *eb,
2557 struct btrfs_disk_key *disk_key, int nr);
2559 static inline void btrfs_set_node_key(struct extent_buffer *eb,
2560 struct btrfs_disk_key *disk_key, int nr)
2563 ptr = btrfs_node_key_ptr_offset(nr);
2564 write_eb_member(eb, (struct btrfs_key_ptr *)ptr,
2565 struct btrfs_key_ptr, key, disk_key);
2568 /* struct btrfs_item */
2569 BTRFS_SETGET_FUNCS(item_offset, struct btrfs_item, offset, 32);
2570 BTRFS_SETGET_FUNCS(item_size, struct btrfs_item, size, 32);
2571 BTRFS_SETGET_STACK_FUNCS(stack_item_offset, struct btrfs_item, offset, 32);
2572 BTRFS_SETGET_STACK_FUNCS(stack_item_size, struct btrfs_item, size, 32);
2574 static inline unsigned long btrfs_item_nr_offset(int nr)
2576 return offsetof(struct btrfs_leaf, items) +
2577 sizeof(struct btrfs_item) * nr;
2580 static inline struct btrfs_item *btrfs_item_nr(int nr)
2582 return (struct btrfs_item *)btrfs_item_nr_offset(nr);
2585 static inline u32 btrfs_item_end(struct extent_buffer *eb,
2586 struct btrfs_item *item)
2588 return btrfs_item_offset(eb, item) + btrfs_item_size(eb, item);
2591 static inline u32 btrfs_item_end_nr(struct extent_buffer *eb, int nr)
2593 return btrfs_item_end(eb, btrfs_item_nr(nr));
2596 static inline u32 btrfs_item_offset_nr(struct extent_buffer *eb, int nr)
2598 return btrfs_item_offset(eb, btrfs_item_nr(nr));
2601 static inline u32 btrfs_item_size_nr(struct extent_buffer *eb, int nr)
2603 return btrfs_item_size(eb, btrfs_item_nr(nr));
2606 static inline void btrfs_item_key(struct extent_buffer *eb,
2607 struct btrfs_disk_key *disk_key, int nr)
2609 struct btrfs_item *item = btrfs_item_nr(nr);
2610 read_eb_member(eb, item, struct btrfs_item, key, disk_key);
2613 static inline void btrfs_set_item_key(struct extent_buffer *eb,
2614 struct btrfs_disk_key *disk_key, int nr)
2616 struct btrfs_item *item = btrfs_item_nr(nr);
2617 write_eb_member(eb, item, struct btrfs_item, key, disk_key);
2620 BTRFS_SETGET_FUNCS(dir_log_end, struct btrfs_dir_log_item, end, 64);
2623 * struct btrfs_root_ref
2625 BTRFS_SETGET_FUNCS(root_ref_dirid, struct btrfs_root_ref, dirid, 64);
2626 BTRFS_SETGET_FUNCS(root_ref_sequence, struct btrfs_root_ref, sequence, 64);
2627 BTRFS_SETGET_FUNCS(root_ref_name_len, struct btrfs_root_ref, name_len, 16);
2629 /* struct btrfs_dir_item */
2630 BTRFS_SETGET_FUNCS(dir_data_len, struct btrfs_dir_item, data_len, 16);
2631 BTRFS_SETGET_FUNCS(dir_type, struct btrfs_dir_item, type, 8);
2632 BTRFS_SETGET_FUNCS(dir_name_len, struct btrfs_dir_item, name_len, 16);
2633 BTRFS_SETGET_FUNCS(dir_transid, struct btrfs_dir_item, transid, 64);
2634 BTRFS_SETGET_STACK_FUNCS(stack_dir_type, struct btrfs_dir_item, type, 8);
2635 BTRFS_SETGET_STACK_FUNCS(stack_dir_data_len, struct btrfs_dir_item,
2637 BTRFS_SETGET_STACK_FUNCS(stack_dir_name_len, struct btrfs_dir_item,
2639 BTRFS_SETGET_STACK_FUNCS(stack_dir_transid, struct btrfs_dir_item,
2642 static inline void btrfs_dir_item_key(struct extent_buffer *eb,
2643 struct btrfs_dir_item *item,
2644 struct btrfs_disk_key *key)
2646 read_eb_member(eb, item, struct btrfs_dir_item, location, key);
2649 static inline void btrfs_set_dir_item_key(struct extent_buffer *eb,
2650 struct btrfs_dir_item *item,
2651 struct btrfs_disk_key *key)
2653 write_eb_member(eb, item, struct btrfs_dir_item, location, key);
2656 BTRFS_SETGET_FUNCS(free_space_entries, struct btrfs_free_space_header,
2658 BTRFS_SETGET_FUNCS(free_space_bitmaps, struct btrfs_free_space_header,
2660 BTRFS_SETGET_FUNCS(free_space_generation, struct btrfs_free_space_header,
2663 static inline void btrfs_free_space_key(struct extent_buffer *eb,
2664 struct btrfs_free_space_header *h,
2665 struct btrfs_disk_key *key)
2667 read_eb_member(eb, h, struct btrfs_free_space_header, location, key);
2670 static inline void btrfs_set_free_space_key(struct extent_buffer *eb,
2671 struct btrfs_free_space_header *h,
2672 struct btrfs_disk_key *key)
2674 write_eb_member(eb, h, struct btrfs_free_space_header, location, key);
2677 /* struct btrfs_disk_key */
2678 BTRFS_SETGET_STACK_FUNCS(disk_key_objectid, struct btrfs_disk_key,
2680 BTRFS_SETGET_STACK_FUNCS(disk_key_offset, struct btrfs_disk_key, offset, 64);
2681 BTRFS_SETGET_STACK_FUNCS(disk_key_type, struct btrfs_disk_key, type, 8);
2683 static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu,
2684 struct btrfs_disk_key *disk)
2686 cpu->offset = le64_to_cpu(disk->offset);
2687 cpu->type = disk->type;
2688 cpu->objectid = le64_to_cpu(disk->objectid);
2691 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk,
2692 struct btrfs_key *cpu)
2694 disk->offset = cpu_to_le64(cpu->offset);
2695 disk->type = cpu->type;
2696 disk->objectid = cpu_to_le64(cpu->objectid);
2699 static inline void btrfs_node_key_to_cpu(struct extent_buffer *eb,
2700 struct btrfs_key *key, int nr)
2702 struct btrfs_disk_key disk_key;
2703 btrfs_node_key(eb, &disk_key, nr);
2704 btrfs_disk_key_to_cpu(key, &disk_key);
2707 static inline void btrfs_item_key_to_cpu(struct extent_buffer *eb,
2708 struct btrfs_key *key, int nr)
2710 struct btrfs_disk_key disk_key;
2711 btrfs_item_key(eb, &disk_key, nr);
2712 btrfs_disk_key_to_cpu(key, &disk_key);
2715 static inline void btrfs_dir_item_key_to_cpu(struct extent_buffer *eb,
2716 struct btrfs_dir_item *item,
2717 struct btrfs_key *key)
2719 struct btrfs_disk_key disk_key;
2720 btrfs_dir_item_key(eb, item, &disk_key);
2721 btrfs_disk_key_to_cpu(key, &disk_key);
2725 static inline u8 btrfs_key_type(struct btrfs_key *key)
2730 static inline void btrfs_set_key_type(struct btrfs_key *key, u8 val)
2735 /* struct btrfs_header */
2736 BTRFS_SETGET_HEADER_FUNCS(header_bytenr, struct btrfs_header, bytenr, 64);
2737 BTRFS_SETGET_HEADER_FUNCS(header_generation, struct btrfs_header,
2739 BTRFS_SETGET_HEADER_FUNCS(header_owner, struct btrfs_header, owner, 64);
2740 BTRFS_SETGET_HEADER_FUNCS(header_nritems, struct btrfs_header, nritems, 32);
2741 BTRFS_SETGET_HEADER_FUNCS(header_flags, struct btrfs_header, flags, 64);
2742 BTRFS_SETGET_HEADER_FUNCS(header_level, struct btrfs_header, level, 8);
2743 BTRFS_SETGET_STACK_FUNCS(stack_header_generation, struct btrfs_header,
2745 BTRFS_SETGET_STACK_FUNCS(stack_header_owner, struct btrfs_header, owner, 64);
2746 BTRFS_SETGET_STACK_FUNCS(stack_header_nritems, struct btrfs_header,
2748 BTRFS_SETGET_STACK_FUNCS(stack_header_bytenr, struct btrfs_header, bytenr, 64);
2750 static inline int btrfs_header_flag(struct extent_buffer *eb, u64 flag)
2752 return (btrfs_header_flags(eb) & flag) == flag;
2755 static inline int btrfs_set_header_flag(struct extent_buffer *eb, u64 flag)
2757 u64 flags = btrfs_header_flags(eb);
2758 btrfs_set_header_flags(eb, flags | flag);
2759 return (flags & flag) == flag;
2762 static inline int btrfs_clear_header_flag(struct extent_buffer *eb, u64 flag)
2764 u64 flags = btrfs_header_flags(eb);
2765 btrfs_set_header_flags(eb, flags & ~flag);
2766 return (flags & flag) == flag;
2769 static inline int btrfs_header_backref_rev(struct extent_buffer *eb)
2771 u64 flags = btrfs_header_flags(eb);
2772 return flags >> BTRFS_BACKREF_REV_SHIFT;
2775 static inline void btrfs_set_header_backref_rev(struct extent_buffer *eb,
2778 u64 flags = btrfs_header_flags(eb);
2779 flags &= ~BTRFS_BACKREF_REV_MASK;
2780 flags |= (u64)rev << BTRFS_BACKREF_REV_SHIFT;
2781 btrfs_set_header_flags(eb, flags);
2784 static inline unsigned long btrfs_header_fsid(void)
2786 return offsetof(struct btrfs_header, fsid);
2789 static inline unsigned long btrfs_header_chunk_tree_uuid(struct extent_buffer *eb)
2791 return offsetof(struct btrfs_header, chunk_tree_uuid);
2794 static inline int btrfs_is_leaf(struct extent_buffer *eb)
2796 return btrfs_header_level(eb) == 0;
2799 /* struct btrfs_root_item */
2800 BTRFS_SETGET_FUNCS(disk_root_generation, struct btrfs_root_item,
2802 BTRFS_SETGET_FUNCS(disk_root_refs, struct btrfs_root_item, refs, 32);
2803 BTRFS_SETGET_FUNCS(disk_root_bytenr, struct btrfs_root_item, bytenr, 64);
2804 BTRFS_SETGET_FUNCS(disk_root_level, struct btrfs_root_item, level, 8);
2806 BTRFS_SETGET_STACK_FUNCS(root_generation, struct btrfs_root_item,
2808 BTRFS_SETGET_STACK_FUNCS(root_bytenr, struct btrfs_root_item, bytenr, 64);
2809 BTRFS_SETGET_STACK_FUNCS(root_level, struct btrfs_root_item, level, 8);
2810 BTRFS_SETGET_STACK_FUNCS(root_dirid, struct btrfs_root_item, root_dirid, 64);
2811 BTRFS_SETGET_STACK_FUNCS(root_refs, struct btrfs_root_item, refs, 32);
2812 BTRFS_SETGET_STACK_FUNCS(root_flags, struct btrfs_root_item, flags, 64);
2813 BTRFS_SETGET_STACK_FUNCS(root_used, struct btrfs_root_item, bytes_used, 64);
2814 BTRFS_SETGET_STACK_FUNCS(root_limit, struct btrfs_root_item, byte_limit, 64);
2815 BTRFS_SETGET_STACK_FUNCS(root_last_snapshot, struct btrfs_root_item,
2817 BTRFS_SETGET_STACK_FUNCS(root_generation_v2, struct btrfs_root_item,
2819 BTRFS_SETGET_STACK_FUNCS(root_ctransid, struct btrfs_root_item,
2821 BTRFS_SETGET_STACK_FUNCS(root_otransid, struct btrfs_root_item,
2823 BTRFS_SETGET_STACK_FUNCS(root_stransid, struct btrfs_root_item,
2825 BTRFS_SETGET_STACK_FUNCS(root_rtransid, struct btrfs_root_item,
2828 static inline bool btrfs_root_readonly(struct btrfs_root *root)
2830 return (root->root_item.flags & cpu_to_le64(BTRFS_ROOT_SUBVOL_RDONLY)) != 0;
2833 static inline bool btrfs_root_dead(struct btrfs_root *root)
2835 return (root->root_item.flags & cpu_to_le64(BTRFS_ROOT_SUBVOL_DEAD)) != 0;
2838 /* struct btrfs_root_backup */
2839 BTRFS_SETGET_STACK_FUNCS(backup_tree_root, struct btrfs_root_backup,
2841 BTRFS_SETGET_STACK_FUNCS(backup_tree_root_gen, struct btrfs_root_backup,
2843 BTRFS_SETGET_STACK_FUNCS(backup_tree_root_level, struct btrfs_root_backup,
2844 tree_root_level, 8);
2846 BTRFS_SETGET_STACK_FUNCS(backup_chunk_root, struct btrfs_root_backup,
2848 BTRFS_SETGET_STACK_FUNCS(backup_chunk_root_gen, struct btrfs_root_backup,
2849 chunk_root_gen, 64);
2850 BTRFS_SETGET_STACK_FUNCS(backup_chunk_root_level, struct btrfs_root_backup,
2851 chunk_root_level, 8);
2853 BTRFS_SETGET_STACK_FUNCS(backup_extent_root, struct btrfs_root_backup,
2855 BTRFS_SETGET_STACK_FUNCS(backup_extent_root_gen, struct btrfs_root_backup,
2856 extent_root_gen, 64);
2857 BTRFS_SETGET_STACK_FUNCS(backup_extent_root_level, struct btrfs_root_backup,
2858 extent_root_level, 8);
2860 BTRFS_SETGET_STACK_FUNCS(backup_fs_root, struct btrfs_root_backup,
2862 BTRFS_SETGET_STACK_FUNCS(backup_fs_root_gen, struct btrfs_root_backup,
2864 BTRFS_SETGET_STACK_FUNCS(backup_fs_root_level, struct btrfs_root_backup,
2867 BTRFS_SETGET_STACK_FUNCS(backup_dev_root, struct btrfs_root_backup,
2869 BTRFS_SETGET_STACK_FUNCS(backup_dev_root_gen, struct btrfs_root_backup,
2871 BTRFS_SETGET_STACK_FUNCS(backup_dev_root_level, struct btrfs_root_backup,
2874 BTRFS_SETGET_STACK_FUNCS(backup_csum_root, struct btrfs_root_backup,
2876 BTRFS_SETGET_STACK_FUNCS(backup_csum_root_gen, struct btrfs_root_backup,
2878 BTRFS_SETGET_STACK_FUNCS(backup_csum_root_level, struct btrfs_root_backup,
2879 csum_root_level, 8);
2880 BTRFS_SETGET_STACK_FUNCS(backup_total_bytes, struct btrfs_root_backup,
2882 BTRFS_SETGET_STACK_FUNCS(backup_bytes_used, struct btrfs_root_backup,
2884 BTRFS_SETGET_STACK_FUNCS(backup_num_devices, struct btrfs_root_backup,
2887 /* struct btrfs_balance_item */
2888 BTRFS_SETGET_FUNCS(balance_flags, struct btrfs_balance_item, flags, 64);
2890 static inline void btrfs_balance_data(struct extent_buffer *eb,
2891 struct btrfs_balance_item *bi,
2892 struct btrfs_disk_balance_args *ba)
2894 read_eb_member(eb, bi, struct btrfs_balance_item, data, ba);
2897 static inline void btrfs_set_balance_data(struct extent_buffer *eb,
2898 struct btrfs_balance_item *bi,
2899 struct btrfs_disk_balance_args *ba)
2901 write_eb_member(eb, bi, struct btrfs_balance_item, data, ba);
2904 static inline void btrfs_balance_meta(struct extent_buffer *eb,
2905 struct btrfs_balance_item *bi,
2906 struct btrfs_disk_balance_args *ba)
2908 read_eb_member(eb, bi, struct btrfs_balance_item, meta, ba);
2911 static inline void btrfs_set_balance_meta(struct extent_buffer *eb,
2912 struct btrfs_balance_item *bi,
2913 struct btrfs_disk_balance_args *ba)
2915 write_eb_member(eb, bi, struct btrfs_balance_item, meta, ba);
2918 static inline void btrfs_balance_sys(struct extent_buffer *eb,
2919 struct btrfs_balance_item *bi,
2920 struct btrfs_disk_balance_args *ba)
2922 read_eb_member(eb, bi, struct btrfs_balance_item, sys, ba);
2925 static inline void btrfs_set_balance_sys(struct extent_buffer *eb,
2926 struct btrfs_balance_item *bi,
2927 struct btrfs_disk_balance_args *ba)
2929 write_eb_member(eb, bi, struct btrfs_balance_item, sys, ba);
2933 btrfs_disk_balance_args_to_cpu(struct btrfs_balance_args *cpu,
2934 struct btrfs_disk_balance_args *disk)
2936 memset(cpu, 0, sizeof(*cpu));
2938 cpu->profiles = le64_to_cpu(disk->profiles);
2939 cpu->usage = le64_to_cpu(disk->usage);
2940 cpu->devid = le64_to_cpu(disk->devid);
2941 cpu->pstart = le64_to_cpu(disk->pstart);
2942 cpu->pend = le64_to_cpu(disk->pend);
2943 cpu->vstart = le64_to_cpu(disk->vstart);
2944 cpu->vend = le64_to_cpu(disk->vend);
2945 cpu->target = le64_to_cpu(disk->target);
2946 cpu->flags = le64_to_cpu(disk->flags);
2947 cpu->limit = le64_to_cpu(disk->limit);
2951 btrfs_cpu_balance_args_to_disk(struct btrfs_disk_balance_args *disk,
2952 struct btrfs_balance_args *cpu)
2954 memset(disk, 0, sizeof(*disk));
2956 disk->profiles = cpu_to_le64(cpu->profiles);
2957 disk->usage = cpu_to_le64(cpu->usage);
2958 disk->devid = cpu_to_le64(cpu->devid);
2959 disk->pstart = cpu_to_le64(cpu->pstart);
2960 disk->pend = cpu_to_le64(cpu->pend);
2961 disk->vstart = cpu_to_le64(cpu->vstart);
2962 disk->vend = cpu_to_le64(cpu->vend);
2963 disk->target = cpu_to_le64(cpu->target);
2964 disk->flags = cpu_to_le64(cpu->flags);
2965 disk->limit = cpu_to_le64(cpu->limit);
2968 /* struct btrfs_super_block */
2969 BTRFS_SETGET_STACK_FUNCS(super_bytenr, struct btrfs_super_block, bytenr, 64);
2970 BTRFS_SETGET_STACK_FUNCS(super_flags, struct btrfs_super_block, flags, 64);
2971 BTRFS_SETGET_STACK_FUNCS(super_generation, struct btrfs_super_block,
2973 BTRFS_SETGET_STACK_FUNCS(super_root, struct btrfs_super_block, root, 64);
2974 BTRFS_SETGET_STACK_FUNCS(super_sys_array_size,
2975 struct btrfs_super_block, sys_chunk_array_size, 32);
2976 BTRFS_SETGET_STACK_FUNCS(super_chunk_root_generation,
2977 struct btrfs_super_block, chunk_root_generation, 64);
2978 BTRFS_SETGET_STACK_FUNCS(super_root_level, struct btrfs_super_block,
2980 BTRFS_SETGET_STACK_FUNCS(super_chunk_root, struct btrfs_super_block,
2982 BTRFS_SETGET_STACK_FUNCS(super_chunk_root_level, struct btrfs_super_block,
2983 chunk_root_level, 8);
2984 BTRFS_SETGET_STACK_FUNCS(super_log_root, struct btrfs_super_block,
2986 BTRFS_SETGET_STACK_FUNCS(super_log_root_transid, struct btrfs_super_block,
2987 log_root_transid, 64);
2988 BTRFS_SETGET_STACK_FUNCS(super_log_root_level, struct btrfs_super_block,
2990 BTRFS_SETGET_STACK_FUNCS(super_total_bytes, struct btrfs_super_block,
2992 BTRFS_SETGET_STACK_FUNCS(super_bytes_used, struct btrfs_super_block,
2994 BTRFS_SETGET_STACK_FUNCS(super_sectorsize, struct btrfs_super_block,
2996 BTRFS_SETGET_STACK_FUNCS(super_nodesize, struct btrfs_super_block,
2998 BTRFS_SETGET_STACK_FUNCS(super_stripesize, struct btrfs_super_block,
3000 BTRFS_SETGET_STACK_FUNCS(super_root_dir, struct btrfs_super_block,
3001 root_dir_objectid, 64);
3002 BTRFS_SETGET_STACK_FUNCS(super_num_devices, struct btrfs_super_block,
3004 BTRFS_SETGET_STACK_FUNCS(super_compat_flags, struct btrfs_super_block,
3006 BTRFS_SETGET_STACK_FUNCS(super_compat_ro_flags, struct btrfs_super_block,
3007 compat_ro_flags, 64);
3008 BTRFS_SETGET_STACK_FUNCS(super_incompat_flags, struct btrfs_super_block,
3009 incompat_flags, 64);
3010 BTRFS_SETGET_STACK_FUNCS(super_csum_type, struct btrfs_super_block,
3012 BTRFS_SETGET_STACK_FUNCS(super_cache_generation, struct btrfs_super_block,
3013 cache_generation, 64);
3014 BTRFS_SETGET_STACK_FUNCS(super_magic, struct btrfs_super_block, magic, 64);
3015 BTRFS_SETGET_STACK_FUNCS(super_uuid_tree_generation, struct btrfs_super_block,
3016 uuid_tree_generation, 64);
3018 static inline int btrfs_super_csum_size(struct btrfs_super_block *s)
3020 u16 t = btrfs_super_csum_type(s);
3022 * csum type is validated at mount time
3024 return btrfs_csum_sizes[t];
3027 static inline unsigned long btrfs_leaf_data(struct extent_buffer *l)
3029 return offsetof(struct btrfs_leaf, items);
3032 /* struct btrfs_file_extent_item */
3033 BTRFS_SETGET_FUNCS(file_extent_type, struct btrfs_file_extent_item, type, 8);
3034 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_disk_bytenr,
3035 struct btrfs_file_extent_item, disk_bytenr, 64);
3036 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_offset,
3037 struct btrfs_file_extent_item, offset, 64);
3038 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_generation,
3039 struct btrfs_file_extent_item, generation, 64);
3040 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_num_bytes,
3041 struct btrfs_file_extent_item, num_bytes, 64);
3042 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_disk_num_bytes,
3043 struct btrfs_file_extent_item, disk_num_bytes, 64);
3044 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_compression,
3045 struct btrfs_file_extent_item, compression, 8);
3047 static inline unsigned long
3048 btrfs_file_extent_inline_start(struct btrfs_file_extent_item *e)
3050 return (unsigned long)e + BTRFS_FILE_EXTENT_INLINE_DATA_START;
3053 static inline u32 btrfs_file_extent_calc_inline_size(u32 datasize)
3055 return BTRFS_FILE_EXTENT_INLINE_DATA_START + datasize;
3058 BTRFS_SETGET_FUNCS(file_extent_disk_bytenr, struct btrfs_file_extent_item,
3060 BTRFS_SETGET_FUNCS(file_extent_generation, struct btrfs_file_extent_item,
3062 BTRFS_SETGET_FUNCS(file_extent_disk_num_bytes, struct btrfs_file_extent_item,
3063 disk_num_bytes, 64);
3064 BTRFS_SETGET_FUNCS(file_extent_offset, struct btrfs_file_extent_item,
3066 BTRFS_SETGET_FUNCS(file_extent_num_bytes, struct btrfs_file_extent_item,
3068 BTRFS_SETGET_FUNCS(file_extent_ram_bytes, struct btrfs_file_extent_item,
3070 BTRFS_SETGET_FUNCS(file_extent_compression, struct btrfs_file_extent_item,
3072 BTRFS_SETGET_FUNCS(file_extent_encryption, struct btrfs_file_extent_item,
3074 BTRFS_SETGET_FUNCS(file_extent_other_encoding, struct btrfs_file_extent_item,
3075 other_encoding, 16);
3078 * this returns the number of bytes used by the item on disk, minus the
3079 * size of any extent headers. If a file is compressed on disk, this is
3080 * the compressed size
3082 static inline u32 btrfs_file_extent_inline_item_len(struct extent_buffer *eb,
3083 struct btrfs_item *e)
3085 return btrfs_item_size(eb, e) - BTRFS_FILE_EXTENT_INLINE_DATA_START;
3088 /* this returns the number of file bytes represented by the inline item.
3089 * If an item is compressed, this is the uncompressed size
3091 static inline u32 btrfs_file_extent_inline_len(struct extent_buffer *eb,
3093 struct btrfs_file_extent_item *fi)
3095 struct btrfs_map_token token;
3097 btrfs_init_map_token(&token);
3099 * return the space used on disk if this item isn't
3100 * compressed or encoded
3102 if (btrfs_token_file_extent_compression(eb, fi, &token) == 0 &&
3103 btrfs_token_file_extent_encryption(eb, fi, &token) == 0 &&
3104 btrfs_token_file_extent_other_encoding(eb, fi, &token) == 0) {
3105 return btrfs_file_extent_inline_item_len(eb,
3106 btrfs_item_nr(slot));
3109 /* otherwise use the ram bytes field */
3110 return btrfs_token_file_extent_ram_bytes(eb, fi, &token);
3114 /* btrfs_dev_stats_item */
3115 static inline u64 btrfs_dev_stats_value(struct extent_buffer *eb,
3116 struct btrfs_dev_stats_item *ptr,
3121 read_extent_buffer(eb, &val,
3122 offsetof(struct btrfs_dev_stats_item, values) +
3123 ((unsigned long)ptr) + (index * sizeof(u64)),
3128 static inline void btrfs_set_dev_stats_value(struct extent_buffer *eb,
3129 struct btrfs_dev_stats_item *ptr,
3132 write_extent_buffer(eb, &val,
3133 offsetof(struct btrfs_dev_stats_item, values) +
3134 ((unsigned long)ptr) + (index * sizeof(u64)),
3138 /* btrfs_qgroup_status_item */
3139 BTRFS_SETGET_FUNCS(qgroup_status_generation, struct btrfs_qgroup_status_item,
3141 BTRFS_SETGET_FUNCS(qgroup_status_version, struct btrfs_qgroup_status_item,
3143 BTRFS_SETGET_FUNCS(qgroup_status_flags, struct btrfs_qgroup_status_item,
3145 BTRFS_SETGET_FUNCS(qgroup_status_rescan, struct btrfs_qgroup_status_item,
3148 /* btrfs_qgroup_info_item */
3149 BTRFS_SETGET_FUNCS(qgroup_info_generation, struct btrfs_qgroup_info_item,
3151 BTRFS_SETGET_FUNCS(qgroup_info_rfer, struct btrfs_qgroup_info_item, rfer, 64);
3152 BTRFS_SETGET_FUNCS(qgroup_info_rfer_cmpr, struct btrfs_qgroup_info_item,
3154 BTRFS_SETGET_FUNCS(qgroup_info_excl, struct btrfs_qgroup_info_item, excl, 64);
3155 BTRFS_SETGET_FUNCS(qgroup_info_excl_cmpr, struct btrfs_qgroup_info_item,
3158 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_generation,
3159 struct btrfs_qgroup_info_item, generation, 64);
3160 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_rfer, struct btrfs_qgroup_info_item,
3162 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_rfer_cmpr,
3163 struct btrfs_qgroup_info_item, rfer_cmpr, 64);
3164 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_excl, struct btrfs_qgroup_info_item,
3166 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_excl_cmpr,
3167 struct btrfs_qgroup_info_item, excl_cmpr, 64);
3169 /* btrfs_qgroup_limit_item */
3170 BTRFS_SETGET_FUNCS(qgroup_limit_flags, struct btrfs_qgroup_limit_item,
3172 BTRFS_SETGET_FUNCS(qgroup_limit_max_rfer, struct btrfs_qgroup_limit_item,
3174 BTRFS_SETGET_FUNCS(qgroup_limit_max_excl, struct btrfs_qgroup_limit_item,
3176 BTRFS_SETGET_FUNCS(qgroup_limit_rsv_rfer, struct btrfs_qgroup_limit_item,
3178 BTRFS_SETGET_FUNCS(qgroup_limit_rsv_excl, struct btrfs_qgroup_limit_item,
3181 /* btrfs_dev_replace_item */
3182 BTRFS_SETGET_FUNCS(dev_replace_src_devid,
3183 struct btrfs_dev_replace_item, src_devid, 64);
3184 BTRFS_SETGET_FUNCS(dev_replace_cont_reading_from_srcdev_mode,
3185 struct btrfs_dev_replace_item, cont_reading_from_srcdev_mode,
3187 BTRFS_SETGET_FUNCS(dev_replace_replace_state, struct btrfs_dev_replace_item,
3189 BTRFS_SETGET_FUNCS(dev_replace_time_started, struct btrfs_dev_replace_item,
3191 BTRFS_SETGET_FUNCS(dev_replace_time_stopped, struct btrfs_dev_replace_item,
3193 BTRFS_SETGET_FUNCS(dev_replace_num_write_errors, struct btrfs_dev_replace_item,
3194 num_write_errors, 64);
3195 BTRFS_SETGET_FUNCS(dev_replace_num_uncorrectable_read_errors,
3196 struct btrfs_dev_replace_item, num_uncorrectable_read_errors,
3198 BTRFS_SETGET_FUNCS(dev_replace_cursor_left, struct btrfs_dev_replace_item,
3200 BTRFS_SETGET_FUNCS(dev_replace_cursor_right, struct btrfs_dev_replace_item,
3203 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_src_devid,
3204 struct btrfs_dev_replace_item, src_devid, 64);
3205 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_cont_reading_from_srcdev_mode,
3206 struct btrfs_dev_replace_item,
3207 cont_reading_from_srcdev_mode, 64);
3208 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_replace_state,
3209 struct btrfs_dev_replace_item, replace_state, 64);
3210 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_time_started,
3211 struct btrfs_dev_replace_item, time_started, 64);
3212 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_time_stopped,
3213 struct btrfs_dev_replace_item, time_stopped, 64);
3214 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_num_write_errors,
3215 struct btrfs_dev_replace_item, num_write_errors, 64);
3216 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_num_uncorrectable_read_errors,
3217 struct btrfs_dev_replace_item,
3218 num_uncorrectable_read_errors, 64);
3219 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_cursor_left,
3220 struct btrfs_dev_replace_item, cursor_left, 64);
3221 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_cursor_right,
3222 struct btrfs_dev_replace_item, cursor_right, 64);
3224 static inline struct btrfs_fs_info *btrfs_sb(struct super_block *sb)
3226 return sb->s_fs_info;
3229 /* helper function to cast into the data area of the leaf. */
3230 #define btrfs_item_ptr(leaf, slot, type) \
3231 ((type *)(btrfs_leaf_data(leaf) + \
3232 btrfs_item_offset_nr(leaf, slot)))
3234 #define btrfs_item_ptr_offset(leaf, slot) \
3235 ((unsigned long)(btrfs_leaf_data(leaf) + \
3236 btrfs_item_offset_nr(leaf, slot)))
3238 static inline bool btrfs_mixed_space_info(struct btrfs_space_info *space_info)
3240 return ((space_info->flags & BTRFS_BLOCK_GROUP_METADATA) &&
3241 (space_info->flags & BTRFS_BLOCK_GROUP_DATA));
3244 static inline gfp_t btrfs_alloc_write_mask(struct address_space *mapping)
3246 return mapping_gfp_mask(mapping) & ~__GFP_FS;
3250 static inline u64 btrfs_calc_trans_metadata_size(struct btrfs_root *root,
3253 return (root->nodesize + root->nodesize * (BTRFS_MAX_LEVEL - 1)) *
3258 * Doing a truncate won't result in new nodes or leaves, just what we need for
3261 static inline u64 btrfs_calc_trunc_metadata_size(struct btrfs_root *root,
3264 return root->nodesize * BTRFS_MAX_LEVEL * num_items;
3267 int btrfs_should_throttle_delayed_refs(struct btrfs_trans_handle *trans,
3268 struct btrfs_root *root);
3269 int btrfs_check_space_for_delayed_refs(struct btrfs_trans_handle *trans,
3270 struct btrfs_root *root);
3271 void btrfs_put_block_group(struct btrfs_block_group_cache *cache);
3272 int btrfs_run_delayed_refs(struct btrfs_trans_handle *trans,
3273 struct btrfs_root *root, unsigned long count);
3274 int btrfs_async_run_delayed_refs(struct btrfs_root *root,
3275 unsigned long count, int wait);
3276 int btrfs_lookup_extent(struct btrfs_root *root, u64 start, u64 len);
3277 int btrfs_lookup_extent_info(struct btrfs_trans_handle *trans,
3278 struct btrfs_root *root, u64 bytenr,
3279 u64 offset, int metadata, u64 *refs, u64 *flags);
3280 int btrfs_pin_extent(struct btrfs_root *root,
3281 u64 bytenr, u64 num, int reserved);
3282 int btrfs_pin_extent_for_log_replay(struct btrfs_root *root,
3283 u64 bytenr, u64 num_bytes);
3284 int btrfs_exclude_logged_extents(struct btrfs_root *root,
3285 struct extent_buffer *eb);
3286 int btrfs_cross_ref_exist(struct btrfs_trans_handle *trans,
3287 struct btrfs_root *root,
3288 u64 objectid, u64 offset, u64 bytenr);
3289 struct btrfs_block_group_cache *btrfs_lookup_block_group(
3290 struct btrfs_fs_info *info,
3292 void btrfs_put_block_group(struct btrfs_block_group_cache *cache);
3293 int get_block_group_index(struct btrfs_block_group_cache *cache);
3294 struct extent_buffer *btrfs_alloc_tree_block(struct btrfs_trans_handle *trans,
3295 struct btrfs_root *root, u64 parent,
3297 struct btrfs_disk_key *key, int level,
3298 u64 hint, u64 empty_size);
3299 void btrfs_free_tree_block(struct btrfs_trans_handle *trans,
3300 struct btrfs_root *root,
3301 struct extent_buffer *buf,
3302 u64 parent, int last_ref);
3303 int btrfs_alloc_reserved_file_extent(struct btrfs_trans_handle *trans,
3304 struct btrfs_root *root,
3305 u64 root_objectid, u64 owner,
3306 u64 offset, struct btrfs_key *ins);
3307 int btrfs_alloc_logged_file_extent(struct btrfs_trans_handle *trans,
3308 struct btrfs_root *root,
3309 u64 root_objectid, u64 owner, u64 offset,
3310 struct btrfs_key *ins);
3311 int btrfs_reserve_extent(struct btrfs_root *root, u64 num_bytes,
3312 u64 min_alloc_size, u64 empty_size, u64 hint_byte,
3313 struct btrfs_key *ins, int is_data, int delalloc);
3314 int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
3315 struct extent_buffer *buf, int full_backref);
3316 int btrfs_dec_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
3317 struct extent_buffer *buf, int full_backref);
3318 int btrfs_set_disk_extent_flags(struct btrfs_trans_handle *trans,
3319 struct btrfs_root *root,
3320 u64 bytenr, u64 num_bytes, u64 flags,
3321 int level, int is_data);
3322 int btrfs_free_extent(struct btrfs_trans_handle *trans,
3323 struct btrfs_root *root,
3324 u64 bytenr, u64 num_bytes, u64 parent, u64 root_objectid,
3325 u64 owner, u64 offset, int no_quota);
3327 int btrfs_free_reserved_extent(struct btrfs_root *root, u64 start, u64 len,
3329 int btrfs_free_and_pin_reserved_extent(struct btrfs_root *root,
3330 u64 start, u64 len);
3331 void btrfs_prepare_extent_commit(struct btrfs_trans_handle *trans,
3332 struct btrfs_root *root);
3333 int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans,
3334 struct btrfs_root *root);
3335 int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
3336 struct btrfs_root *root,
3337 u64 bytenr, u64 num_bytes, u64 parent,
3338 u64 root_objectid, u64 owner, u64 offset, int no_quota);
3340 int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans,
3341 struct btrfs_root *root);
3342 int btrfs_extent_readonly(struct btrfs_root *root, u64 bytenr);
3343 int btrfs_free_block_groups(struct btrfs_fs_info *info);
3344 int btrfs_read_block_groups(struct btrfs_root *root);
3345 int btrfs_can_relocate(struct btrfs_root *root, u64 bytenr);
3346 int btrfs_make_block_group(struct btrfs_trans_handle *trans,
3347 struct btrfs_root *root, u64 bytes_used,
3348 u64 type, u64 chunk_objectid, u64 chunk_offset,
3350 int btrfs_remove_block_group(struct btrfs_trans_handle *trans,
3351 struct btrfs_root *root, u64 group_start);
3352 void btrfs_delete_unused_bgs(struct btrfs_fs_info *fs_info);
3353 void btrfs_create_pending_block_groups(struct btrfs_trans_handle *trans,
3354 struct btrfs_root *root);
3355 u64 btrfs_get_alloc_profile(struct btrfs_root *root, int data);
3356 void btrfs_clear_space_info_full(struct btrfs_fs_info *info);
3358 enum btrfs_reserve_flush_enum {
3359 /* If we are in the transaction, we can't flush anything.*/
3360 BTRFS_RESERVE_NO_FLUSH,
3362 * Flushing delalloc may cause deadlock somewhere, in this
3363 * case, use FLUSH LIMIT
3365 BTRFS_RESERVE_FLUSH_LIMIT,
3366 BTRFS_RESERVE_FLUSH_ALL,
3369 int btrfs_check_data_free_space(struct inode *inode, u64 bytes);
3370 void btrfs_free_reserved_data_space(struct inode *inode, u64 bytes);
3371 void btrfs_trans_release_metadata(struct btrfs_trans_handle *trans,
3372 struct btrfs_root *root);
3373 int btrfs_orphan_reserve_metadata(struct btrfs_trans_handle *trans,
3374 struct inode *inode);
3375 void btrfs_orphan_release_metadata(struct inode *inode);
3376 int btrfs_subvolume_reserve_metadata(struct btrfs_root *root,
3377 struct btrfs_block_rsv *rsv,
3379 u64 *qgroup_reserved, bool use_global_rsv);
3380 void btrfs_subvolume_release_metadata(struct btrfs_root *root,
3381 struct btrfs_block_rsv *rsv,
3382 u64 qgroup_reserved);
3383 int btrfs_delalloc_reserve_metadata(struct inode *inode, u64 num_bytes);
3384 void btrfs_delalloc_release_metadata(struct inode *inode, u64 num_bytes);
3385 int btrfs_delalloc_reserve_space(struct inode *inode, u64 num_bytes);
3386 void btrfs_delalloc_release_space(struct inode *inode, u64 num_bytes);
3387 void btrfs_init_block_rsv(struct btrfs_block_rsv *rsv, unsigned short type);
3388 struct btrfs_block_rsv *btrfs_alloc_block_rsv(struct btrfs_root *root,
3389 unsigned short type);
3390 void btrfs_free_block_rsv(struct btrfs_root *root,
3391 struct btrfs_block_rsv *rsv);
3392 int btrfs_block_rsv_add(struct btrfs_root *root,
3393 struct btrfs_block_rsv *block_rsv, u64 num_bytes,
3394 enum btrfs_reserve_flush_enum flush);
3395 int btrfs_block_rsv_check(struct btrfs_root *root,
3396 struct btrfs_block_rsv *block_rsv, int min_factor);
3397 int btrfs_block_rsv_refill(struct btrfs_root *root,
3398 struct btrfs_block_rsv *block_rsv, u64 min_reserved,
3399 enum btrfs_reserve_flush_enum flush);
3400 int btrfs_block_rsv_migrate(struct btrfs_block_rsv *src_rsv,
3401 struct btrfs_block_rsv *dst_rsv,
3403 int btrfs_cond_migrate_bytes(struct btrfs_fs_info *fs_info,
3404 struct btrfs_block_rsv *dest, u64 num_bytes,
3406 void btrfs_block_rsv_release(struct btrfs_root *root,
3407 struct btrfs_block_rsv *block_rsv,
3409 int btrfs_set_block_group_ro(struct btrfs_root *root,
3410 struct btrfs_block_group_cache *cache);
3411 void btrfs_set_block_group_rw(struct btrfs_root *root,
3412 struct btrfs_block_group_cache *cache);
3413 void btrfs_put_block_group_cache(struct btrfs_fs_info *info);
3414 u64 btrfs_account_ro_block_groups_free_space(struct btrfs_space_info *sinfo);
3415 int btrfs_error_unpin_extent_range(struct btrfs_root *root,
3416 u64 start, u64 end);
3417 int btrfs_error_discard_extent(struct btrfs_root *root, u64 bytenr,
3418 u64 num_bytes, u64 *actual_bytes);
3419 int btrfs_force_chunk_alloc(struct btrfs_trans_handle *trans,
3420 struct btrfs_root *root, u64 type);
3421 int btrfs_trim_fs(struct btrfs_root *root, struct fstrim_range *range);
3423 int btrfs_init_space_info(struct btrfs_fs_info *fs_info);
3424 int btrfs_delayed_refs_qgroup_accounting(struct btrfs_trans_handle *trans,
3425 struct btrfs_fs_info *fs_info);
3426 int __get_raid_index(u64 flags);
3427 int btrfs_start_nocow_write(struct btrfs_root *root);
3428 void btrfs_end_nocow_write(struct btrfs_root *root);
3430 int btrfs_bin_search(struct extent_buffer *eb, struct btrfs_key *key,
3431 int level, int *slot);
3432 int btrfs_comp_cpu_keys(struct btrfs_key *k1, struct btrfs_key *k2);
3433 int btrfs_previous_item(struct btrfs_root *root,
3434 struct btrfs_path *path, u64 min_objectid,
3436 int btrfs_previous_extent_item(struct btrfs_root *root,
3437 struct btrfs_path *path, u64 min_objectid);
3438 void btrfs_set_item_key_safe(struct btrfs_root *root, struct btrfs_path *path,
3439 struct btrfs_key *new_key);
3440 struct extent_buffer *btrfs_root_node(struct btrfs_root *root);
3441 struct extent_buffer *btrfs_lock_root_node(struct btrfs_root *root);
3442 int btrfs_find_next_key(struct btrfs_root *root, struct btrfs_path *path,
3443 struct btrfs_key *key, int lowest_level,
3445 int btrfs_search_forward(struct btrfs_root *root, struct btrfs_key *min_key,
3446 struct btrfs_path *path,
3448 enum btrfs_compare_tree_result {
3449 BTRFS_COMPARE_TREE_NEW,
3450 BTRFS_COMPARE_TREE_DELETED,
3451 BTRFS_COMPARE_TREE_CHANGED,
3452 BTRFS_COMPARE_TREE_SAME,
3454 typedef int (*btrfs_changed_cb_t)(struct btrfs_root *left_root,
3455 struct btrfs_root *right_root,
3456 struct btrfs_path *left_path,
3457 struct btrfs_path *right_path,
3458 struct btrfs_key *key,
3459 enum btrfs_compare_tree_result result,
3461 int btrfs_compare_trees(struct btrfs_root *left_root,
3462 struct btrfs_root *right_root,
3463 btrfs_changed_cb_t cb, void *ctx);
3464 int btrfs_cow_block(struct btrfs_trans_handle *trans,
3465 struct btrfs_root *root, struct extent_buffer *buf,
3466 struct extent_buffer *parent, int parent_slot,
3467 struct extent_buffer **cow_ret);
3468 int btrfs_copy_root(struct btrfs_trans_handle *trans,
3469 struct btrfs_root *root,
3470 struct extent_buffer *buf,
3471 struct extent_buffer **cow_ret, u64 new_root_objectid);
3472 int btrfs_block_can_be_shared(struct btrfs_root *root,
3473 struct extent_buffer *buf);
3474 void btrfs_extend_item(struct btrfs_root *root, struct btrfs_path *path,
3476 void btrfs_truncate_item(struct btrfs_root *root, struct btrfs_path *path,
3477 u32 new_size, int from_end);
3478 int btrfs_split_item(struct btrfs_trans_handle *trans,
3479 struct btrfs_root *root,
3480 struct btrfs_path *path,
3481 struct btrfs_key *new_key,
3482 unsigned long split_offset);
3483 int btrfs_duplicate_item(struct btrfs_trans_handle *trans,
3484 struct btrfs_root *root,
3485 struct btrfs_path *path,
3486 struct btrfs_key *new_key);
3487 int btrfs_find_item(struct btrfs_root *fs_root, struct btrfs_path *path,
3488 u64 inum, u64 ioff, u8 key_type, struct btrfs_key *found_key);
3489 int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root
3490 *root, struct btrfs_key *key, struct btrfs_path *p, int
3492 int btrfs_search_old_slot(struct btrfs_root *root, struct btrfs_key *key,
3493 struct btrfs_path *p, u64 time_seq);
3494 int btrfs_search_slot_for_read(struct btrfs_root *root,
3495 struct btrfs_key *key, struct btrfs_path *p,
3496 int find_higher, int return_any);
3497 int btrfs_realloc_node(struct btrfs_trans_handle *trans,
3498 struct btrfs_root *root, struct extent_buffer *parent,
3499 int start_slot, u64 *last_ret,
3500 struct btrfs_key *progress);
3501 void btrfs_release_path(struct btrfs_path *p);
3502 struct btrfs_path *btrfs_alloc_path(void);
3503 void btrfs_free_path(struct btrfs_path *p);
3504 void btrfs_set_path_blocking(struct btrfs_path *p);
3505 void btrfs_clear_path_blocking(struct btrfs_path *p,
3506 struct extent_buffer *held, int held_rw);
3507 void btrfs_unlock_up_safe(struct btrfs_path *p, int level);
3509 int btrfs_del_items(struct btrfs_trans_handle *trans, struct btrfs_root *root,
3510 struct btrfs_path *path, int slot, int nr);
3511 static inline int btrfs_del_item(struct btrfs_trans_handle *trans,
3512 struct btrfs_root *root,
3513 struct btrfs_path *path)
3515 return btrfs_del_items(trans, root, path, path->slots[0], 1);
3518 void setup_items_for_insert(struct btrfs_root *root, struct btrfs_path *path,
3519 struct btrfs_key *cpu_key, u32 *data_size,
3520 u32 total_data, u32 total_size, int nr);
3521 int btrfs_insert_item(struct btrfs_trans_handle *trans, struct btrfs_root
3522 *root, struct btrfs_key *key, void *data, u32 data_size);
3523 int btrfs_insert_empty_items(struct btrfs_trans_handle *trans,
3524 struct btrfs_root *root,
3525 struct btrfs_path *path,
3526 struct btrfs_key *cpu_key, u32 *data_size, int nr);
3528 static inline int btrfs_insert_empty_item(struct btrfs_trans_handle *trans,
3529 struct btrfs_root *root,
3530 struct btrfs_path *path,
3531 struct btrfs_key *key,
3534 return btrfs_insert_empty_items(trans, root, path, key, &data_size, 1);
3537 int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path);
3538 int btrfs_prev_leaf(struct btrfs_root *root, struct btrfs_path *path);
3539 int btrfs_next_old_leaf(struct btrfs_root *root, struct btrfs_path *path,
3541 static inline int btrfs_next_old_item(struct btrfs_root *root,
3542 struct btrfs_path *p, u64 time_seq)
3545 if (p->slots[0] >= btrfs_header_nritems(p->nodes[0]))
3546 return btrfs_next_old_leaf(root, p, time_seq);
3549 static inline int btrfs_next_item(struct btrfs_root *root, struct btrfs_path *p)
3551 return btrfs_next_old_item(root, p, 0);
3553 int btrfs_leaf_free_space(struct btrfs_root *root, struct extent_buffer *leaf);
3554 int __must_check btrfs_drop_snapshot(struct btrfs_root *root,
3555 struct btrfs_block_rsv *block_rsv,
3556 int update_ref, int for_reloc);
3557 int btrfs_drop_subtree(struct btrfs_trans_handle *trans,
3558 struct btrfs_root *root,
3559 struct extent_buffer *node,
3560 struct extent_buffer *parent);
3561 static inline int btrfs_fs_closing(struct btrfs_fs_info *fs_info)
3564 * Get synced with close_ctree()
3567 return fs_info->closing;
3571 * If we remount the fs to be R/O or umount the fs, the cleaner needn't do
3572 * anything except sleeping. This function is used to check the status of
3575 static inline int btrfs_need_cleaner_sleep(struct btrfs_root *root)
3577 return (root->fs_info->sb->s_flags & MS_RDONLY ||
3578 btrfs_fs_closing(root->fs_info));
3581 static inline void free_fs_info(struct btrfs_fs_info *fs_info)
3583 kfree(fs_info->balance_ctl);
3584 kfree(fs_info->delayed_root);
3585 kfree(fs_info->extent_root);
3586 kfree(fs_info->tree_root);
3587 kfree(fs_info->chunk_root);
3588 kfree(fs_info->dev_root);
3589 kfree(fs_info->csum_root);
3590 kfree(fs_info->quota_root);
3591 kfree(fs_info->uuid_root);
3592 kfree(fs_info->super_copy);
3593 kfree(fs_info->super_for_commit);
3597 /* tree mod log functions from ctree.c */
3598 u64 btrfs_get_tree_mod_seq(struct btrfs_fs_info *fs_info,
3599 struct seq_list *elem);
3600 void btrfs_put_tree_mod_seq(struct btrfs_fs_info *fs_info,
3601 struct seq_list *elem);
3602 int btrfs_old_root_level(struct btrfs_root *root, u64 time_seq);
3605 int btrfs_find_root_ref(struct btrfs_root *tree_root,
3606 struct btrfs_path *path,
3607 u64 root_id, u64 ref_id);
3608 int btrfs_add_root_ref(struct btrfs_trans_handle *trans,
3609 struct btrfs_root *tree_root,
3610 u64 root_id, u64 ref_id, u64 dirid, u64 sequence,
3611 const char *name, int name_len);
3612 int btrfs_del_root_ref(struct btrfs_trans_handle *trans,
3613 struct btrfs_root *tree_root,
3614 u64 root_id, u64 ref_id, u64 dirid, u64 *sequence,
3615 const char *name, int name_len);
3616 int btrfs_del_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
3617 struct btrfs_key *key);
3618 int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root
3619 *root, struct btrfs_key *key, struct btrfs_root_item
3621 int __must_check btrfs_update_root(struct btrfs_trans_handle *trans,
3622 struct btrfs_root *root,
3623 struct btrfs_key *key,
3624 struct btrfs_root_item *item);
3625 int btrfs_find_root(struct btrfs_root *root, struct btrfs_key *search_key,
3626 struct btrfs_path *path, struct btrfs_root_item *root_item,
3627 struct btrfs_key *root_key);
3628 int btrfs_find_orphan_roots(struct btrfs_root *tree_root);
3629 void btrfs_set_root_node(struct btrfs_root_item *item,
3630 struct extent_buffer *node);
3631 void btrfs_check_and_init_root_item(struct btrfs_root_item *item);
3632 void btrfs_update_root_times(struct btrfs_trans_handle *trans,
3633 struct btrfs_root *root);
3636 int btrfs_uuid_tree_add(struct btrfs_trans_handle *trans,
3637 struct btrfs_root *uuid_root, u8 *uuid, u8 type,
3639 int btrfs_uuid_tree_rem(struct btrfs_trans_handle *trans,
3640 struct btrfs_root *uuid_root, u8 *uuid, u8 type,
3642 int btrfs_uuid_tree_iterate(struct btrfs_fs_info *fs_info,
3643 int (*check_func)(struct btrfs_fs_info *, u8 *, u8,
3647 int btrfs_check_dir_item_collision(struct btrfs_root *root, u64 dir,
3648 const char *name, int name_len);
3649 int btrfs_insert_dir_item(struct btrfs_trans_handle *trans,
3650 struct btrfs_root *root, const char *name,
3651 int name_len, struct inode *dir,
3652 struct btrfs_key *location, u8 type, u64 index);
3653 struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans,
3654 struct btrfs_root *root,
3655 struct btrfs_path *path, u64 dir,
3656 const char *name, int name_len,
3658 struct btrfs_dir_item *
3659 btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans,
3660 struct btrfs_root *root,
3661 struct btrfs_path *path, u64 dir,
3662 u64 objectid, const char *name, int name_len,
3664 struct btrfs_dir_item *
3665 btrfs_search_dir_index_item(struct btrfs_root *root,
3666 struct btrfs_path *path, u64 dirid,
3667 const char *name, int name_len);
3668 int btrfs_delete_one_dir_name(struct btrfs_trans_handle *trans,
3669 struct btrfs_root *root,
3670 struct btrfs_path *path,
3671 struct btrfs_dir_item *di);
3672 int btrfs_insert_xattr_item(struct btrfs_trans_handle *trans,
3673 struct btrfs_root *root,
3674 struct btrfs_path *path, u64 objectid,
3675 const char *name, u16 name_len,
3676 const void *data, u16 data_len);
3677 struct btrfs_dir_item *btrfs_lookup_xattr(struct btrfs_trans_handle *trans,
3678 struct btrfs_root *root,
3679 struct btrfs_path *path, u64 dir,
3680 const char *name, u16 name_len,
3682 int verify_dir_item(struct btrfs_root *root,
3683 struct extent_buffer *leaf,
3684 struct btrfs_dir_item *dir_item);
3687 int btrfs_insert_orphan_item(struct btrfs_trans_handle *trans,
3688 struct btrfs_root *root, u64 offset);
3689 int btrfs_del_orphan_item(struct btrfs_trans_handle *trans,
3690 struct btrfs_root *root, u64 offset);
3691 int btrfs_find_orphan_item(struct btrfs_root *root, u64 offset);
3694 int btrfs_insert_inode_ref(struct btrfs_trans_handle *trans,
3695 struct btrfs_root *root,
3696 const char *name, int name_len,
3697 u64 inode_objectid, u64 ref_objectid, u64 index);
3698 int btrfs_del_inode_ref(struct btrfs_trans_handle *trans,
3699 struct btrfs_root *root,
3700 const char *name, int name_len,
3701 u64 inode_objectid, u64 ref_objectid, u64 *index);
3702 int btrfs_insert_empty_inode(struct btrfs_trans_handle *trans,
3703 struct btrfs_root *root,
3704 struct btrfs_path *path, u64 objectid);
3705 int btrfs_lookup_inode(struct btrfs_trans_handle *trans, struct btrfs_root
3706 *root, struct btrfs_path *path,
3707 struct btrfs_key *location, int mod);
3709 struct btrfs_inode_extref *
3710 btrfs_lookup_inode_extref(struct btrfs_trans_handle *trans,
3711 struct btrfs_root *root,
3712 struct btrfs_path *path,
3713 const char *name, int name_len,
3714 u64 inode_objectid, u64 ref_objectid, int ins_len,
3717 int btrfs_find_name_in_ext_backref(struct btrfs_path *path,
3718 u64 ref_objectid, const char *name,
3720 struct btrfs_inode_extref **extref_ret);
3723 struct btrfs_dio_private;
3724 int btrfs_del_csums(struct btrfs_trans_handle *trans,
3725 struct btrfs_root *root, u64 bytenr, u64 len);
3726 int btrfs_lookup_bio_sums(struct btrfs_root *root, struct inode *inode,
3727 struct bio *bio, u32 *dst);
3728 int btrfs_lookup_bio_sums_dio(struct btrfs_root *root, struct inode *inode,
3729 struct bio *bio, u64 logical_offset);
3730 int btrfs_insert_file_extent(struct btrfs_trans_handle *trans,
3731 struct btrfs_root *root,
3732 u64 objectid, u64 pos,
3733 u64 disk_offset, u64 disk_num_bytes,
3734 u64 num_bytes, u64 offset, u64 ram_bytes,
3735 u8 compression, u8 encryption, u16 other_encoding);
3736 int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
3737 struct btrfs_root *root,
3738 struct btrfs_path *path, u64 objectid,
3739 u64 bytenr, int mod);
3740 int btrfs_csum_file_blocks(struct btrfs_trans_handle *trans,
3741 struct btrfs_root *root,
3742 struct btrfs_ordered_sum *sums);
3743 int btrfs_csum_one_bio(struct btrfs_root *root, struct inode *inode,
3744 struct bio *bio, u64 file_start, int contig);
3745 int btrfs_lookup_csums_range(struct btrfs_root *root, u64 start, u64 end,
3746 struct list_head *list, int search_commit);
3747 void btrfs_extent_item_to_extent_map(struct inode *inode,
3748 const struct btrfs_path *path,
3749 struct btrfs_file_extent_item *fi,
3750 const bool new_inline,
3751 struct extent_map *em);
3754 struct btrfs_delalloc_work {
3755 struct inode *inode;
3758 struct completion completion;
3759 struct list_head list;
3760 struct btrfs_work work;
3763 struct btrfs_delalloc_work *btrfs_alloc_delalloc_work(struct inode *inode,
3764 int wait, int delay_iput);
3765 void btrfs_wait_and_free_delalloc_work(struct btrfs_delalloc_work *work);
3767 struct extent_map *btrfs_get_extent_fiemap(struct inode *inode, struct page *page,
3768 size_t pg_offset, u64 start, u64 len,
3770 noinline int can_nocow_extent(struct inode *inode, u64 offset, u64 *len,
3771 u64 *orig_start, u64 *orig_block_len,
3774 /* RHEL and EL kernels have a patch that renames PG_checked to FsMisc */
3775 #if defined(ClearPageFsMisc) && !defined(ClearPageChecked)
3776 #define ClearPageChecked ClearPageFsMisc
3777 #define SetPageChecked SetPageFsMisc
3778 #define PageChecked PageFsMisc
3781 /* This forces readahead on a given range of bytes in an inode */
3782 static inline void btrfs_force_ra(struct address_space *mapping,
3783 struct file_ra_state *ra, struct file *file,
3784 pgoff_t offset, unsigned long req_size)
3786 page_cache_sync_readahead(mapping, ra, file, offset, req_size);
3789 struct inode *btrfs_lookup_dentry(struct inode *dir, struct dentry *dentry);
3790 int btrfs_set_inode_index(struct inode *dir, u64 *index);
3791 int btrfs_unlink_inode(struct btrfs_trans_handle *trans,
3792 struct btrfs_root *root,
3793 struct inode *dir, struct inode *inode,
3794 const char *name, int name_len);
3795 int btrfs_add_link(struct btrfs_trans_handle *trans,
3796 struct inode *parent_inode, struct inode *inode,
3797 const char *name, int name_len, int add_backref, u64 index);
3798 int btrfs_unlink_subvol(struct btrfs_trans_handle *trans,
3799 struct btrfs_root *root,
3800 struct inode *dir, u64 objectid,
3801 const char *name, int name_len);
3802 int btrfs_truncate_page(struct inode *inode, loff_t from, loff_t len,
3804 int btrfs_truncate_inode_items(struct btrfs_trans_handle *trans,
3805 struct btrfs_root *root,
3806 struct inode *inode, u64 new_size,
3809 int btrfs_start_delalloc_inodes(struct btrfs_root *root, int delay_iput);
3810 int btrfs_start_delalloc_roots(struct btrfs_fs_info *fs_info, int delay_iput,
3812 int btrfs_set_extent_delalloc(struct inode *inode, u64 start, u64 end,
3813 struct extent_state **cached_state);
3814 int btrfs_create_subvol_root(struct btrfs_trans_handle *trans,
3815 struct btrfs_root *new_root,
3816 struct btrfs_root *parent_root,
3818 int btrfs_merge_bio_hook(int rw, struct page *page, unsigned long offset,
3819 size_t size, struct bio *bio,
3820 unsigned long bio_flags);
3821 int btrfs_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf);
3822 int btrfs_readpage(struct file *file, struct page *page);
3823 void btrfs_evict_inode(struct inode *inode);
3824 int btrfs_write_inode(struct inode *inode, struct writeback_control *wbc);
3825 struct inode *btrfs_alloc_inode(struct super_block *sb);
3826 void btrfs_destroy_inode(struct inode *inode);
3827 int btrfs_drop_inode(struct inode *inode);
3828 int btrfs_init_cachep(void);
3829 void btrfs_destroy_cachep(void);
3830 long btrfs_ioctl_trans_end(struct file *file);
3831 struct inode *btrfs_iget(struct super_block *s, struct btrfs_key *location,
3832 struct btrfs_root *root, int *was_new);
3833 struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page,
3834 size_t pg_offset, u64 start, u64 end,
3836 int btrfs_update_inode(struct btrfs_trans_handle *trans,
3837 struct btrfs_root *root,
3838 struct inode *inode);
3839 int btrfs_update_inode_fallback(struct btrfs_trans_handle *trans,
3840 struct btrfs_root *root, struct inode *inode);
3841 int btrfs_orphan_add(struct btrfs_trans_handle *trans, struct inode *inode);
3842 int btrfs_orphan_cleanup(struct btrfs_root *root);
3843 void btrfs_orphan_commit_root(struct btrfs_trans_handle *trans,
3844 struct btrfs_root *root);
3845 int btrfs_cont_expand(struct inode *inode, loff_t oldsize, loff_t size);
3846 void btrfs_invalidate_inodes(struct btrfs_root *root);
3847 void btrfs_add_delayed_iput(struct inode *inode);
3848 void btrfs_run_delayed_iputs(struct btrfs_root *root);
3849 int btrfs_prealloc_file_range(struct inode *inode, int mode,
3850 u64 start, u64 num_bytes, u64 min_size,
3851 loff_t actual_len, u64 *alloc_hint);
3852 int btrfs_prealloc_file_range_trans(struct inode *inode,
3853 struct btrfs_trans_handle *trans, int mode,
3854 u64 start, u64 num_bytes, u64 min_size,
3855 loff_t actual_len, u64 *alloc_hint);
3856 extern const struct dentry_operations btrfs_dentry_operations;
3859 long btrfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
3860 void btrfs_update_iflags(struct inode *inode);
3861 void btrfs_inherit_iflags(struct inode *inode, struct inode *dir);
3862 int btrfs_is_empty_uuid(u8 *uuid);
3863 int btrfs_defrag_file(struct inode *inode, struct file *file,
3864 struct btrfs_ioctl_defrag_range_args *range,
3865 u64 newer_than, unsigned long max_pages);
3866 void btrfs_get_block_group_info(struct list_head *groups_list,
3867 struct btrfs_ioctl_space_info *space);
3868 void update_ioctl_balance_args(struct btrfs_fs_info *fs_info, int lock,
3869 struct btrfs_ioctl_balance_args *bargs);
3873 int btrfs_auto_defrag_init(void);
3874 void btrfs_auto_defrag_exit(void);
3875 int btrfs_add_inode_defrag(struct btrfs_trans_handle *trans,
3876 struct inode *inode);
3877 int btrfs_run_defrag_inodes(struct btrfs_fs_info *fs_info);
3878 void btrfs_cleanup_defrag_inodes(struct btrfs_fs_info *fs_info);
3879 int btrfs_sync_file(struct file *file, loff_t start, loff_t end, int datasync);
3880 void btrfs_drop_extent_cache(struct inode *inode, u64 start, u64 end,
3882 extern const struct file_operations btrfs_file_operations;
3883 int __btrfs_drop_extents(struct btrfs_trans_handle *trans,
3884 struct btrfs_root *root, struct inode *inode,
3885 struct btrfs_path *path, u64 start, u64 end,
3886 u64 *drop_end, int drop_cache,
3888 u32 extent_item_size,
3890 int btrfs_drop_extents(struct btrfs_trans_handle *trans,
3891 struct btrfs_root *root, struct inode *inode, u64 start,
3892 u64 end, int drop_cache);
3893 int btrfs_mark_extent_written(struct btrfs_trans_handle *trans,
3894 struct inode *inode, u64 start, u64 end);
3895 int btrfs_release_file(struct inode *inode, struct file *file);
3896 int btrfs_dirty_pages(struct btrfs_root *root, struct inode *inode,
3897 struct page **pages, size_t num_pages,
3898 loff_t pos, size_t write_bytes,
3899 struct extent_state **cached);
3902 int btrfs_defrag_leaves(struct btrfs_trans_handle *trans,
3903 struct btrfs_root *root);
3906 int btrfs_init_sysfs(void);
3907 void btrfs_exit_sysfs(void);
3908 int btrfs_sysfs_add_one(struct btrfs_fs_info *fs_info);
3909 void btrfs_sysfs_remove_one(struct btrfs_fs_info *fs_info);
3912 ssize_t btrfs_listxattr(struct dentry *dentry, char *buffer, size_t size);
3915 int btrfs_parse_options(struct btrfs_root *root, char *options);
3916 int btrfs_sync_fs(struct super_block *sb, int wait);
3918 #ifdef CONFIG_PRINTK
3920 void btrfs_printk(const struct btrfs_fs_info *fs_info, const char *fmt, ...);
3922 static inline __printf(2, 3)
3923 void btrfs_printk(const struct btrfs_fs_info *fs_info, const char *fmt, ...)
3928 #define btrfs_emerg(fs_info, fmt, args...) \
3929 btrfs_printk(fs_info, KERN_EMERG fmt, ##args)
3930 #define btrfs_alert(fs_info, fmt, args...) \
3931 btrfs_printk(fs_info, KERN_ALERT fmt, ##args)
3932 #define btrfs_crit(fs_info, fmt, args...) \
3933 btrfs_printk(fs_info, KERN_CRIT fmt, ##args)
3934 #define btrfs_err(fs_info, fmt, args...) \
3935 btrfs_printk(fs_info, KERN_ERR fmt, ##args)
3936 #define btrfs_warn(fs_info, fmt, args...) \
3937 btrfs_printk(fs_info, KERN_WARNING fmt, ##args)
3938 #define btrfs_notice(fs_info, fmt, args...) \
3939 btrfs_printk(fs_info, KERN_NOTICE fmt, ##args)
3940 #define btrfs_info(fs_info, fmt, args...) \
3941 btrfs_printk(fs_info, KERN_INFO fmt, ##args)
3944 #define btrfs_debug(fs_info, fmt, args...) \
3945 btrfs_printk(fs_info, KERN_DEBUG fmt, ##args)
3947 #define btrfs_debug(fs_info, fmt, args...) \
3948 no_printk(KERN_DEBUG fmt, ##args)
3951 #ifdef CONFIG_BTRFS_ASSERT
3953 static inline void assfail(char *expr, char *file, int line)
3955 pr_err("BTRFS: assertion failed: %s, file: %s, line: %d",
3960 #define ASSERT(expr) \
3961 (likely(expr) ? (void)0 : assfail(#expr, __FILE__, __LINE__))
3963 #define ASSERT(expr) ((void)0)
3966 #define btrfs_assert()
3968 void __btrfs_std_error(struct btrfs_fs_info *fs_info, const char *function,
3969 unsigned int line, int errno, const char *fmt, ...);
3972 void __btrfs_abort_transaction(struct btrfs_trans_handle *trans,
3973 struct btrfs_root *root, const char *function,
3974 unsigned int line, int errno);
3976 #define btrfs_set_fs_incompat(__fs_info, opt) \
3977 __btrfs_set_fs_incompat((__fs_info), BTRFS_FEATURE_INCOMPAT_##opt)
3979 static inline void __btrfs_set_fs_incompat(struct btrfs_fs_info *fs_info,
3982 struct btrfs_super_block *disk_super;
3985 disk_super = fs_info->super_copy;
3986 features = btrfs_super_incompat_flags(disk_super);
3987 if (!(features & flag)) {
3988 spin_lock(&fs_info->super_lock);
3989 features = btrfs_super_incompat_flags(disk_super);
3990 if (!(features & flag)) {
3992 btrfs_set_super_incompat_flags(disk_super, features);
3993 btrfs_info(fs_info, "setting %llu feature flag",
3996 spin_unlock(&fs_info->super_lock);
4000 #define btrfs_fs_incompat(fs_info, opt) \
4001 __btrfs_fs_incompat((fs_info), BTRFS_FEATURE_INCOMPAT_##opt)
4003 static inline int __btrfs_fs_incompat(struct btrfs_fs_info *fs_info, u64 flag)
4005 struct btrfs_super_block *disk_super;
4006 disk_super = fs_info->super_copy;
4007 return !!(btrfs_super_incompat_flags(disk_super) & flag);
4011 * Call btrfs_abort_transaction as early as possible when an error condition is
4012 * detected, that way the exact line number is reported.
4015 #define btrfs_abort_transaction(trans, root, errno) \
4017 __btrfs_abort_transaction(trans, root, __func__, \
4021 #define btrfs_std_error(fs_info, errno) \
4024 __btrfs_std_error((fs_info), __func__, \
4025 __LINE__, (errno), NULL); \
4028 #define btrfs_error(fs_info, errno, fmt, args...) \
4030 __btrfs_std_error((fs_info), __func__, __LINE__, \
4031 (errno), fmt, ##args); \
4035 void __btrfs_panic(struct btrfs_fs_info *fs_info, const char *function,
4036 unsigned int line, int errno, const char *fmt, ...);
4039 * If BTRFS_MOUNT_PANIC_ON_FATAL_ERROR is in mount_opt, __btrfs_panic
4040 * will panic(). Otherwise we BUG() here.
4042 #define btrfs_panic(fs_info, errno, fmt, args...) \
4044 __btrfs_panic(fs_info, __func__, __LINE__, errno, fmt, ##args); \
4049 #ifdef CONFIG_BTRFS_FS_POSIX_ACL
4050 struct posix_acl *btrfs_get_acl(struct inode *inode, int type);
4051 int btrfs_set_acl(struct inode *inode, struct posix_acl *acl, int type);
4052 int btrfs_init_acl(struct btrfs_trans_handle *trans,
4053 struct inode *inode, struct inode *dir);
4055 #define btrfs_get_acl NULL
4056 #define btrfs_set_acl NULL
4057 static inline int btrfs_init_acl(struct btrfs_trans_handle *trans,
4058 struct inode *inode, struct inode *dir)
4065 int btrfs_relocate_block_group(struct btrfs_root *root, u64 group_start);
4066 int btrfs_init_reloc_root(struct btrfs_trans_handle *trans,
4067 struct btrfs_root *root);
4068 int btrfs_update_reloc_root(struct btrfs_trans_handle *trans,
4069 struct btrfs_root *root);
4070 int btrfs_recover_relocation(struct btrfs_root *root);
4071 int btrfs_reloc_clone_csums(struct inode *inode, u64 file_pos, u64 len);
4072 int btrfs_reloc_cow_block(struct btrfs_trans_handle *trans,
4073 struct btrfs_root *root, struct extent_buffer *buf,
4074 struct extent_buffer *cow);
4075 void btrfs_reloc_pre_snapshot(struct btrfs_trans_handle *trans,
4076 struct btrfs_pending_snapshot *pending,
4077 u64 *bytes_to_reserve);
4078 int btrfs_reloc_post_snapshot(struct btrfs_trans_handle *trans,
4079 struct btrfs_pending_snapshot *pending);
4082 int btrfs_scrub_dev(struct btrfs_fs_info *fs_info, u64 devid, u64 start,
4083 u64 end, struct btrfs_scrub_progress *progress,
4084 int readonly, int is_dev_replace);
4085 void btrfs_scrub_pause(struct btrfs_root *root);
4086 void btrfs_scrub_continue(struct btrfs_root *root);
4087 int btrfs_scrub_cancel(struct btrfs_fs_info *info);
4088 int btrfs_scrub_cancel_dev(struct btrfs_fs_info *info,
4089 struct btrfs_device *dev);
4090 int btrfs_scrub_progress(struct btrfs_root *root, u64 devid,
4091 struct btrfs_scrub_progress *progress);
4094 void btrfs_bio_counter_inc_blocked(struct btrfs_fs_info *fs_info);
4095 void btrfs_bio_counter_inc_noblocked(struct btrfs_fs_info *fs_info);
4096 void btrfs_bio_counter_dec(struct btrfs_fs_info *fs_info);
4099 struct reada_control {
4100 struct btrfs_root *root; /* tree to prefetch */
4101 struct btrfs_key key_start;
4102 struct btrfs_key key_end; /* exclusive */
4105 wait_queue_head_t wait;
4107 struct reada_control *btrfs_reada_add(struct btrfs_root *root,
4108 struct btrfs_key *start, struct btrfs_key *end);
4109 int btrfs_reada_wait(void *handle);
4110 void btrfs_reada_detach(void *handle);
4111 int btree_readahead_hook(struct btrfs_root *root, struct extent_buffer *eb,
4112 u64 start, int err);
4114 static inline int is_fstree(u64 rootid)
4116 if (rootid == BTRFS_FS_TREE_OBJECTID ||
4117 (s64)rootid >= (s64)BTRFS_FIRST_FREE_OBJECTID)
4122 static inline int btrfs_defrag_cancelled(struct btrfs_fs_info *fs_info)
4124 return signal_pending(current);
4127 /* Sanity test specific functions */
4128 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
4129 void btrfs_test_destroy_inode(struct inode *inode);
4132 static inline int btrfs_test_is_dummy_root(struct btrfs_root *root)
4134 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
4135 if (unlikely(test_bit(BTRFS_ROOT_DUMMY_ROOT, &root->state)))