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/completion.h>
27 #include <linux/backing-dev.h>
28 #include <linux/wait.h>
29 #include <linux/slab.h>
30 #include <linux/kobject.h>
31 #include <trace/events/btrfs.h>
32 #include <asm/kmap_types.h>
33 #include <linux/pagemap.h>
34 #include "extent_io.h"
35 #include "extent_map.h"
36 #include "async-thread.h"
39 struct btrfs_trans_handle;
40 struct btrfs_transaction;
41 struct btrfs_pending_snapshot;
42 extern struct kmem_cache *btrfs_trans_handle_cachep;
43 extern struct kmem_cache *btrfs_transaction_cachep;
44 extern struct kmem_cache *btrfs_bit_radix_cachep;
45 extern struct kmem_cache *btrfs_path_cachep;
46 extern struct kmem_cache *btrfs_free_space_cachep;
47 struct btrfs_ordered_sum;
49 #define BTRFS_MAGIC "_BHRfS_M"
51 #define BTRFS_MAX_MIRRORS 2
53 #define BTRFS_MAX_LEVEL 8
55 #define BTRFS_COMPAT_EXTENT_TREE_V0
58 * files bigger than this get some pre-flushing when they are added
59 * to the ordered operations list. That way we limit the total
60 * work done by the commit
62 #define BTRFS_ORDERED_OPERATIONS_FLUSH_LIMIT (8 * 1024 * 1024)
64 /* holds pointers to all of the tree roots */
65 #define BTRFS_ROOT_TREE_OBJECTID 1ULL
67 /* stores information about which extents are in use, and reference counts */
68 #define BTRFS_EXTENT_TREE_OBJECTID 2ULL
71 * chunk tree stores translations from logical -> physical block numbering
72 * the super block points to the chunk tree
74 #define BTRFS_CHUNK_TREE_OBJECTID 3ULL
77 * stores information about which areas of a given device are in use.
78 * one per device. The tree of tree roots points to the device tree
80 #define BTRFS_DEV_TREE_OBJECTID 4ULL
82 /* one per subvolume, storing files and directories */
83 #define BTRFS_FS_TREE_OBJECTID 5ULL
85 /* directory objectid inside the root tree */
86 #define BTRFS_ROOT_TREE_DIR_OBJECTID 6ULL
88 /* holds checksums of all the data extents */
89 #define BTRFS_CSUM_TREE_OBJECTID 7ULL
91 /* for storing balance parameters in the root tree */
92 #define BTRFS_BALANCE_OBJECTID -4ULL
94 /* holds quota configuration and tracking */
95 #define BTRFS_QUOTA_TREE_OBJECTID 8ULL
97 /* orhpan objectid for tracking unlinked/truncated files */
98 #define BTRFS_ORPHAN_OBJECTID -5ULL
100 /* does write ahead logging to speed up fsyncs */
101 #define BTRFS_TREE_LOG_OBJECTID -6ULL
102 #define BTRFS_TREE_LOG_FIXUP_OBJECTID -7ULL
104 /* for space balancing */
105 #define BTRFS_TREE_RELOC_OBJECTID -8ULL
106 #define BTRFS_DATA_RELOC_TREE_OBJECTID -9ULL
109 * extent checksums all have this objectid
110 * this allows them to share the logging tree
113 #define BTRFS_EXTENT_CSUM_OBJECTID -10ULL
115 /* For storing free space cache */
116 #define BTRFS_FREE_SPACE_OBJECTID -11ULL
119 * The inode number assigned to the special inode for storing
122 #define BTRFS_FREE_INO_OBJECTID -12ULL
124 /* dummy objectid represents multiple objectids */
125 #define BTRFS_MULTIPLE_OBJECTIDS -255ULL
128 * All files have objectids in this range.
130 #define BTRFS_FIRST_FREE_OBJECTID 256ULL
131 #define BTRFS_LAST_FREE_OBJECTID -256ULL
132 #define BTRFS_FIRST_CHUNK_TREE_OBJECTID 256ULL
136 * the device items go into the chunk tree. The key is in the form
137 * [ 1 BTRFS_DEV_ITEM_KEY device_id ]
139 #define BTRFS_DEV_ITEMS_OBJECTID 1ULL
141 #define BTRFS_BTREE_INODE_OBJECTID 1
143 #define BTRFS_EMPTY_SUBVOL_DIR_OBJECTID 2
145 #define BTRFS_DEV_REPLACE_DEVID 0
148 * the max metadata block size. This limit is somewhat artificial,
149 * but the memmove costs go through the roof for larger blocks.
151 #define BTRFS_MAX_METADATA_BLOCKSIZE 65536
154 * we can actually store much bigger names, but lets not confuse the rest
157 #define BTRFS_NAME_LEN 255
160 * Theoretical limit is larger, but we keep this down to a sane
161 * value. That should limit greatly the possibility of collisions on
164 #define BTRFS_LINK_MAX 65535U
166 /* 32 bytes in various csum fields */
167 #define BTRFS_CSUM_SIZE 32
170 #define BTRFS_CSUM_TYPE_CRC32 0
172 static int btrfs_csum_sizes[] = { 4, 0 };
174 /* four bytes for CRC32 */
175 #define BTRFS_EMPTY_DIR_SIZE 0
177 #define BTRFS_FT_UNKNOWN 0
178 #define BTRFS_FT_REG_FILE 1
179 #define BTRFS_FT_DIR 2
180 #define BTRFS_FT_CHRDEV 3
181 #define BTRFS_FT_BLKDEV 4
182 #define BTRFS_FT_FIFO 5
183 #define BTRFS_FT_SOCK 6
184 #define BTRFS_FT_SYMLINK 7
185 #define BTRFS_FT_XATTR 8
186 #define BTRFS_FT_MAX 9
188 /* ioprio of readahead is set to idle */
189 #define BTRFS_IOPRIO_READA (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_IDLE, 0))
192 * The key defines the order in the tree, and so it also defines (optimal)
195 * objectid corresponds to the inode number.
197 * type tells us things about the object, and is a kind of stream selector.
198 * so for a given inode, keys with type of 1 might refer to the inode data,
199 * type of 2 may point to file data in the btree and type == 3 may point to
202 * offset is the starting byte offset for this key in the stream.
204 * btrfs_disk_key is in disk byte order. struct btrfs_key is always
205 * in cpu native order. Otherwise they are identical and their sizes
206 * should be the same (ie both packed)
208 struct btrfs_disk_key {
212 } __attribute__ ((__packed__));
218 } __attribute__ ((__packed__));
220 struct btrfs_mapping_tree {
221 struct extent_map_tree map_tree;
224 struct btrfs_dev_item {
225 /* the internal btrfs device id */
228 /* size of the device */
234 /* optimal io alignment for this device */
237 /* optimal io width for this device */
240 /* minimal io size for this device */
243 /* type and info about this device */
246 /* expected generation for this device */
250 * starting byte of this partition on the device,
251 * to allow for stripe alignment in the future
255 /* grouping information for allocation decisions */
258 /* seek speed 0-100 where 100 is fastest */
261 /* bandwidth 0-100 where 100 is fastest */
264 /* btrfs generated uuid for this device */
265 u8 uuid[BTRFS_UUID_SIZE];
267 /* uuid of FS who owns this device */
268 u8 fsid[BTRFS_UUID_SIZE];
269 } __attribute__ ((__packed__));
271 struct btrfs_stripe {
274 u8 dev_uuid[BTRFS_UUID_SIZE];
275 } __attribute__ ((__packed__));
278 /* size of this chunk in bytes */
281 /* objectid of the root referencing this chunk */
287 /* optimal io alignment for this chunk */
290 /* optimal io width for this chunk */
293 /* minimal io size for this chunk */
296 /* 2^16 stripes is quite a lot, a second limit is the size of a single
301 /* sub stripes only matter for raid10 */
303 struct btrfs_stripe stripe;
304 /* additional stripes go here */
305 } __attribute__ ((__packed__));
307 #define BTRFS_FREE_SPACE_EXTENT 1
308 #define BTRFS_FREE_SPACE_BITMAP 2
310 struct btrfs_free_space_entry {
314 } __attribute__ ((__packed__));
316 struct btrfs_free_space_header {
317 struct btrfs_disk_key location;
321 } __attribute__ ((__packed__));
323 static inline unsigned long btrfs_chunk_item_size(int num_stripes)
325 BUG_ON(num_stripes == 0);
326 return sizeof(struct btrfs_chunk) +
327 sizeof(struct btrfs_stripe) * (num_stripes - 1);
330 #define BTRFS_HEADER_FLAG_WRITTEN (1ULL << 0)
331 #define BTRFS_HEADER_FLAG_RELOC (1ULL << 1)
337 /* Errors detected */
338 #define BTRFS_SUPER_FLAG_ERROR (1ULL << 2)
340 #define BTRFS_SUPER_FLAG_SEEDING (1ULL << 32)
341 #define BTRFS_SUPER_FLAG_METADUMP (1ULL << 33)
343 #define BTRFS_BACKREF_REV_MAX 256
344 #define BTRFS_BACKREF_REV_SHIFT 56
345 #define BTRFS_BACKREF_REV_MASK (((u64)BTRFS_BACKREF_REV_MAX - 1) << \
346 BTRFS_BACKREF_REV_SHIFT)
348 #define BTRFS_OLD_BACKREF_REV 0
349 #define BTRFS_MIXED_BACKREF_REV 1
352 * every tree block (leaf or node) starts with this header.
354 struct btrfs_header {
355 /* these first four must match the super block */
356 u8 csum[BTRFS_CSUM_SIZE];
357 u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
358 __le64 bytenr; /* which block this node is supposed to live in */
361 /* allowed to be different from the super from here on down */
362 u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
367 } __attribute__ ((__packed__));
369 #define BTRFS_NODEPTRS_PER_BLOCK(r) (((r)->nodesize - \
370 sizeof(struct btrfs_header)) / \
371 sizeof(struct btrfs_key_ptr))
372 #define __BTRFS_LEAF_DATA_SIZE(bs) ((bs) - sizeof(struct btrfs_header))
373 #define BTRFS_LEAF_DATA_SIZE(r) (__BTRFS_LEAF_DATA_SIZE(r->leafsize))
374 #define BTRFS_MAX_INLINE_DATA_SIZE(r) (BTRFS_LEAF_DATA_SIZE(r) - \
375 sizeof(struct btrfs_item) - \
376 sizeof(struct btrfs_file_extent_item))
377 #define BTRFS_MAX_XATTR_SIZE(r) (BTRFS_LEAF_DATA_SIZE(r) - \
378 sizeof(struct btrfs_item) -\
379 sizeof(struct btrfs_dir_item))
383 * this is a very generous portion of the super block, giving us
384 * room to translate 14 chunks with 3 stripes each.
386 #define BTRFS_SYSTEM_CHUNK_ARRAY_SIZE 2048
387 #define BTRFS_LABEL_SIZE 256
390 * just in case we somehow lose the roots and are not able to mount,
391 * we store an array of the roots from previous transactions
394 #define BTRFS_NUM_BACKUP_ROOTS 4
395 struct btrfs_root_backup {
397 __le64 tree_root_gen;
400 __le64 chunk_root_gen;
403 __le64 extent_root_gen;
412 __le64 csum_root_gen;
422 u8 extent_root_level;
426 /* future and to align */
428 } __attribute__ ((__packed__));
431 * the super block basically lists the main trees of the FS
432 * it currently lacks any block count etc etc
434 struct btrfs_super_block {
435 u8 csum[BTRFS_CSUM_SIZE];
436 /* the first 4 fields must match struct btrfs_header */
437 u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
438 __le64 bytenr; /* this block number */
441 /* allowed to be different from the btrfs_header from here own down */
448 /* this will help find the new super based on the log root */
449 __le64 log_root_transid;
452 __le64 root_dir_objectid;
458 __le32 sys_chunk_array_size;
459 __le64 chunk_root_generation;
461 __le64 compat_ro_flags;
462 __le64 incompat_flags;
467 struct btrfs_dev_item dev_item;
469 char label[BTRFS_LABEL_SIZE];
471 __le64 cache_generation;
473 /* future expansion */
475 u8 sys_chunk_array[BTRFS_SYSTEM_CHUNK_ARRAY_SIZE];
476 struct btrfs_root_backup super_roots[BTRFS_NUM_BACKUP_ROOTS];
477 } __attribute__ ((__packed__));
480 * Compat flags that we support. If any incompat flags are set other than the
481 * ones specified below then we will fail to mount
483 #define BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF (1ULL << 0)
484 #define BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL (1ULL << 1)
485 #define BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS (1ULL << 2)
486 #define BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO (1ULL << 3)
488 * some patches floated around with a second compression method
489 * lets save that incompat here for when they do get in
490 * Note we don't actually support it, we're just reserving the
493 #define BTRFS_FEATURE_INCOMPAT_COMPRESS_LZOv2 (1ULL << 4)
496 * older kernels tried to do bigger metadata blocks, but the
497 * code was pretty buggy. Lets not let them try anymore.
499 #define BTRFS_FEATURE_INCOMPAT_BIG_METADATA (1ULL << 5)
501 #define BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF (1ULL << 6)
503 #define BTRFS_FEATURE_COMPAT_SUPP 0ULL
504 #define BTRFS_FEATURE_COMPAT_RO_SUPP 0ULL
505 #define BTRFS_FEATURE_INCOMPAT_SUPP \
506 (BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF | \
507 BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL | \
508 BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS | \
509 BTRFS_FEATURE_INCOMPAT_BIG_METADATA | \
510 BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO | \
511 BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF)
514 * A leaf is full of items. offset and size tell us where to find
515 * the item in the leaf (relative to the start of the data area)
518 struct btrfs_disk_key key;
521 } __attribute__ ((__packed__));
524 * leaves have an item area and a data area:
525 * [item0, item1....itemN] [free space] [dataN...data1, data0]
527 * The data is separate from the items to get the keys closer together
531 struct btrfs_header header;
532 struct btrfs_item items[];
533 } __attribute__ ((__packed__));
536 * all non-leaf blocks are nodes, they hold only keys and pointers to
539 struct btrfs_key_ptr {
540 struct btrfs_disk_key key;
543 } __attribute__ ((__packed__));
546 struct btrfs_header header;
547 struct btrfs_key_ptr ptrs[];
548 } __attribute__ ((__packed__));
551 * btrfs_paths remember the path taken from the root down to the leaf.
552 * level 0 is always the leaf, and nodes[1...BTRFS_MAX_LEVEL] will point
553 * to any other levels that are present.
555 * The slots array records the index of the item or block pointer
556 * used while walking the tree.
559 struct extent_buffer *nodes[BTRFS_MAX_LEVEL];
560 int slots[BTRFS_MAX_LEVEL];
561 /* if there is real range locking, this locks field will change */
562 int locks[BTRFS_MAX_LEVEL];
564 /* keep some upper locks as we walk down */
568 * set by btrfs_split_item, tells search_slot to keep all locks
569 * and to force calls to keep space in the nodes
571 unsigned int search_for_split:1;
572 unsigned int keep_locks:1;
573 unsigned int skip_locking:1;
574 unsigned int leave_spinning:1;
575 unsigned int search_commit_root:1;
579 * items in the extent btree are used to record the objectid of the
580 * owner of the block and the number of references
583 struct btrfs_extent_item {
587 } __attribute__ ((__packed__));
589 struct btrfs_extent_item_v0 {
591 } __attribute__ ((__packed__));
593 #define BTRFS_MAX_EXTENT_ITEM_SIZE(r) ((BTRFS_LEAF_DATA_SIZE(r) >> 4) - \
594 sizeof(struct btrfs_item))
596 #define BTRFS_EXTENT_FLAG_DATA (1ULL << 0)
597 #define BTRFS_EXTENT_FLAG_TREE_BLOCK (1ULL << 1)
599 /* following flags only apply to tree blocks */
601 /* use full backrefs for extent pointers in the block */
602 #define BTRFS_BLOCK_FLAG_FULL_BACKREF (1ULL << 8)
605 * this flag is only used internally by scrub and may be changed at any time
606 * it is only declared here to avoid collisions
608 #define BTRFS_EXTENT_FLAG_SUPER (1ULL << 48)
610 struct btrfs_tree_block_info {
611 struct btrfs_disk_key key;
613 } __attribute__ ((__packed__));
615 struct btrfs_extent_data_ref {
620 } __attribute__ ((__packed__));
622 struct btrfs_shared_data_ref {
624 } __attribute__ ((__packed__));
626 struct btrfs_extent_inline_ref {
629 } __attribute__ ((__packed__));
631 /* old style backrefs item */
632 struct btrfs_extent_ref_v0 {
637 } __attribute__ ((__packed__));
640 /* dev extents record free space on individual devices. The owner
641 * field points back to the chunk allocation mapping tree that allocated
642 * the extent. The chunk tree uuid field is a way to double check the owner
644 struct btrfs_dev_extent {
646 __le64 chunk_objectid;
649 u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
650 } __attribute__ ((__packed__));
652 struct btrfs_inode_ref {
656 } __attribute__ ((__packed__));
658 struct btrfs_inode_extref {
659 __le64 parent_objectid;
664 } __attribute__ ((__packed__));
666 struct btrfs_timespec {
669 } __attribute__ ((__packed__));
671 enum btrfs_compression_type {
672 BTRFS_COMPRESS_NONE = 0,
673 BTRFS_COMPRESS_ZLIB = 1,
674 BTRFS_COMPRESS_LZO = 2,
675 BTRFS_COMPRESS_TYPES = 2,
676 BTRFS_COMPRESS_LAST = 3,
679 struct btrfs_inode_item {
680 /* nfs style generation number */
682 /* transid that last touched this inode */
694 /* modification sequence number for NFS */
698 * a little future expansion, for more than this we can
699 * just grow the inode item and version it
702 struct btrfs_timespec atime;
703 struct btrfs_timespec ctime;
704 struct btrfs_timespec mtime;
705 struct btrfs_timespec otime;
706 } __attribute__ ((__packed__));
708 struct btrfs_dir_log_item {
710 } __attribute__ ((__packed__));
712 struct btrfs_dir_item {
713 struct btrfs_disk_key location;
718 } __attribute__ ((__packed__));
720 #define BTRFS_ROOT_SUBVOL_RDONLY (1ULL << 0)
722 struct btrfs_root_item {
723 struct btrfs_inode_item inode;
729 __le64 last_snapshot;
732 struct btrfs_disk_key drop_progress;
737 * The following fields appear after subvol_uuids+subvol_times
742 * This generation number is used to test if the new fields are valid
743 * and up to date while reading the root item. Everytime the root item
744 * is written out, the "generation" field is copied into this field. If
745 * anyone ever mounted the fs with an older kernel, we will have
746 * mismatching generation values here and thus must invalidate the
747 * new fields. See btrfs_update_root and btrfs_find_last_root for
749 * the offset of generation_v2 is also used as the start for the memset
750 * when invalidating the fields.
752 __le64 generation_v2;
753 u8 uuid[BTRFS_UUID_SIZE];
754 u8 parent_uuid[BTRFS_UUID_SIZE];
755 u8 received_uuid[BTRFS_UUID_SIZE];
756 __le64 ctransid; /* updated when an inode changes */
757 __le64 otransid; /* trans when created */
758 __le64 stransid; /* trans when sent. non-zero for received subvol */
759 __le64 rtransid; /* trans when received. non-zero for received subvol */
760 struct btrfs_timespec ctime;
761 struct btrfs_timespec otime;
762 struct btrfs_timespec stime;
763 struct btrfs_timespec rtime;
764 __le64 reserved[8]; /* for future */
765 } __attribute__ ((__packed__));
768 * this is used for both forward and backward root refs
770 struct btrfs_root_ref {
774 } __attribute__ ((__packed__));
776 struct btrfs_disk_balance_args {
778 * profiles to operate on, single is denoted by
779 * BTRFS_AVAIL_ALLOC_BIT_SINGLE
789 /* devid subset filter [pstart..pend) */
793 /* btrfs virtual address space subset filter [vstart..vend) */
798 * profile to convert to, single is denoted by
799 * BTRFS_AVAIL_ALLOC_BIT_SINGLE
803 /* BTRFS_BALANCE_ARGS_* */
807 } __attribute__ ((__packed__));
810 * store balance parameters to disk so that balance can be properly
811 * resumed after crash or unmount
813 struct btrfs_balance_item {
814 /* BTRFS_BALANCE_* */
817 struct btrfs_disk_balance_args data;
818 struct btrfs_disk_balance_args meta;
819 struct btrfs_disk_balance_args sys;
822 } __attribute__ ((__packed__));
824 #define BTRFS_FILE_EXTENT_INLINE 0
825 #define BTRFS_FILE_EXTENT_REG 1
826 #define BTRFS_FILE_EXTENT_PREALLOC 2
828 struct btrfs_file_extent_item {
830 * transaction id that created this extent
834 * max number of bytes to hold this extent in ram
835 * when we split a compressed extent we can't know how big
836 * each of the resulting pieces will be. So, this is
837 * an upper limit on the size of the extent in ram instead of
843 * 32 bits for the various ways we might encode the data,
844 * including compression and encryption. If any of these
845 * are set to something a given disk format doesn't understand
846 * it is treated like an incompat flag for reading and writing,
851 __le16 other_encoding; /* spare for later use */
853 /* are we inline data or a real extent? */
857 * disk space consumed by the extent, checksum blocks are included
861 __le64 disk_num_bytes;
863 * the logical offset in file blocks (no csums)
864 * this extent record is for. This allows a file extent to point
865 * into the middle of an existing extent on disk, sharing it
866 * between two snapshots (useful if some bytes in the middle of the
867 * extent have changed
871 * the logical number of file blocks (no csums included). This
872 * always reflects the size uncompressed and without encoding.
876 } __attribute__ ((__packed__));
878 struct btrfs_csum_item {
880 } __attribute__ ((__packed__));
882 struct btrfs_dev_stats_item {
884 * grow this item struct at the end for future enhancements and keep
885 * the existing values unchanged
887 __le64 values[BTRFS_DEV_STAT_VALUES_MAX];
888 } __attribute__ ((__packed__));
890 #define BTRFS_DEV_REPLACE_ITEM_CONT_READING_FROM_SRCDEV_MODE_ALWAYS 0
891 #define BTRFS_DEV_REPLACE_ITEM_CONT_READING_FROM_SRCDEV_MODE_AVOID 1
892 #define BTRFS_DEV_REPLACE_ITEM_STATE_NEVER_STARTED 0
893 #define BTRFS_DEV_REPLACE_ITEM_STATE_STARTED 1
894 #define BTRFS_DEV_REPLACE_ITEM_STATE_SUSPENDED 2
895 #define BTRFS_DEV_REPLACE_ITEM_STATE_FINISHED 3
896 #define BTRFS_DEV_REPLACE_ITEM_STATE_CANCELED 4
898 struct btrfs_dev_replace {
899 u64 replace_state; /* see #define above */
900 u64 time_started; /* seconds since 1-Jan-1970 */
901 u64 time_stopped; /* seconds since 1-Jan-1970 */
902 atomic64_t num_write_errors;
903 atomic64_t num_uncorrectable_read_errors;
906 u64 committed_cursor_left;
907 u64 cursor_left_last_write_of_item;
910 u64 cont_reading_from_srcdev_mode; /* see #define above */
913 int item_needs_writeback;
914 struct btrfs_device *srcdev;
915 struct btrfs_device *tgtdev;
918 atomic_t nesting_level;
919 struct mutex lock_finishing_cancel_unmount;
920 struct mutex lock_management_lock;
923 struct btrfs_scrub_progress scrub_progress;
926 struct btrfs_dev_replace_item {
928 * grow this item struct at the end for future enhancements and keep
929 * the existing values unchanged
934 __le64 cont_reading_from_srcdev_mode;
936 __le64 replace_state;
939 __le64 num_write_errors;
940 __le64 num_uncorrectable_read_errors;
941 } __attribute__ ((__packed__));
943 /* different types of block groups (and chunks) */
944 #define BTRFS_BLOCK_GROUP_DATA (1ULL << 0)
945 #define BTRFS_BLOCK_GROUP_SYSTEM (1ULL << 1)
946 #define BTRFS_BLOCK_GROUP_METADATA (1ULL << 2)
947 #define BTRFS_BLOCK_GROUP_RAID0 (1ULL << 3)
948 #define BTRFS_BLOCK_GROUP_RAID1 (1ULL << 4)
949 #define BTRFS_BLOCK_GROUP_DUP (1ULL << 5)
950 #define BTRFS_BLOCK_GROUP_RAID10 (1ULL << 6)
951 #define BTRFS_BLOCK_GROUP_RESERVED BTRFS_AVAIL_ALLOC_BIT_SINGLE
952 #define BTRFS_NR_RAID_TYPES 5
954 #define BTRFS_BLOCK_GROUP_TYPE_MASK (BTRFS_BLOCK_GROUP_DATA | \
955 BTRFS_BLOCK_GROUP_SYSTEM | \
956 BTRFS_BLOCK_GROUP_METADATA)
958 #define BTRFS_BLOCK_GROUP_PROFILE_MASK (BTRFS_BLOCK_GROUP_RAID0 | \
959 BTRFS_BLOCK_GROUP_RAID1 | \
960 BTRFS_BLOCK_GROUP_DUP | \
961 BTRFS_BLOCK_GROUP_RAID10)
963 * We need a bit for restriper to be able to tell when chunks of type
964 * SINGLE are available. This "extended" profile format is used in
965 * fs_info->avail_*_alloc_bits (in-memory) and balance item fields
966 * (on-disk). The corresponding on-disk bit in chunk.type is reserved
967 * to avoid remappings between two formats in future.
969 #define BTRFS_AVAIL_ALLOC_BIT_SINGLE (1ULL << 48)
971 #define BTRFS_EXTENDED_PROFILE_MASK (BTRFS_BLOCK_GROUP_PROFILE_MASK | \
972 BTRFS_AVAIL_ALLOC_BIT_SINGLE)
974 static inline u64 chunk_to_extended(u64 flags)
976 if ((flags & BTRFS_BLOCK_GROUP_PROFILE_MASK) == 0)
977 flags |= BTRFS_AVAIL_ALLOC_BIT_SINGLE;
981 static inline u64 extended_to_chunk(u64 flags)
983 return flags & ~BTRFS_AVAIL_ALLOC_BIT_SINGLE;
986 struct btrfs_block_group_item {
988 __le64 chunk_objectid;
990 } __attribute__ ((__packed__));
993 * is subvolume quota turned on?
995 #define BTRFS_QGROUP_STATUS_FLAG_ON (1ULL << 0)
997 * SCANNING is set during the initialization phase
999 #define BTRFS_QGROUP_STATUS_FLAG_SCANNING (1ULL << 1)
1001 * Some qgroup entries are known to be out of date,
1002 * either because the configuration has changed in a way that
1003 * makes a rescan necessary, or because the fs has been mounted
1004 * with a non-qgroup-aware version.
1005 * Turning qouta off and on again makes it inconsistent, too.
1007 #define BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT (1ULL << 2)
1009 #define BTRFS_QGROUP_STATUS_VERSION 1
1011 struct btrfs_qgroup_status_item {
1014 * the generation is updated during every commit. As older
1015 * versions of btrfs are not aware of qgroups, it will be
1016 * possible to detect inconsistencies by checking the
1017 * generation on mount time
1021 /* flag definitions see above */
1025 * only used during scanning to record the progress
1026 * of the scan. It contains a logical address
1029 } __attribute__ ((__packed__));
1031 struct btrfs_qgroup_info_item {
1037 } __attribute__ ((__packed__));
1039 /* flags definition for qgroup limits */
1040 #define BTRFS_QGROUP_LIMIT_MAX_RFER (1ULL << 0)
1041 #define BTRFS_QGROUP_LIMIT_MAX_EXCL (1ULL << 1)
1042 #define BTRFS_QGROUP_LIMIT_RSV_RFER (1ULL << 2)
1043 #define BTRFS_QGROUP_LIMIT_RSV_EXCL (1ULL << 3)
1044 #define BTRFS_QGROUP_LIMIT_RFER_CMPR (1ULL << 4)
1045 #define BTRFS_QGROUP_LIMIT_EXCL_CMPR (1ULL << 5)
1047 struct btrfs_qgroup_limit_item {
1049 * only updated when any of the other values change
1056 } __attribute__ ((__packed__));
1058 struct btrfs_space_info {
1061 u64 total_bytes; /* total bytes in the space,
1062 this doesn't take mirrors into account */
1063 u64 bytes_used; /* total bytes used,
1064 this doesn't take mirrors into account */
1065 u64 bytes_pinned; /* total bytes pinned, will be freed when the
1066 transaction finishes */
1067 u64 bytes_reserved; /* total bytes the allocator has reserved for
1068 current allocations */
1069 u64 bytes_readonly; /* total bytes that are read only */
1071 u64 bytes_may_use; /* number of bytes that may be used for
1072 delalloc/allocations */
1073 u64 disk_used; /* total bytes used on disk */
1074 u64 disk_total; /* total bytes on disk, takes mirrors into
1078 * we bump reservation progress every time we decrement
1079 * bytes_reserved. This way people waiting for reservations
1080 * know something good has happened and they can check
1081 * for progress. The number here isn't to be trusted, it
1082 * just shows reclaim activity
1084 unsigned long reservation_progress;
1086 unsigned int full:1; /* indicates that we cannot allocate any more
1087 chunks for this space */
1088 unsigned int chunk_alloc:1; /* set if we are allocating a chunk */
1090 unsigned int flush:1; /* set if we are trying to make space */
1092 unsigned int force_alloc; /* set if we need to force a chunk
1093 alloc for this space */
1095 struct list_head list;
1097 /* for block groups in our same type */
1098 struct list_head block_groups[BTRFS_NR_RAID_TYPES];
1100 struct rw_semaphore groups_sem;
1101 wait_queue_head_t wait;
1104 #define BTRFS_BLOCK_RSV_GLOBAL 1
1105 #define BTRFS_BLOCK_RSV_DELALLOC 2
1106 #define BTRFS_BLOCK_RSV_TRANS 3
1107 #define BTRFS_BLOCK_RSV_CHUNK 4
1108 #define BTRFS_BLOCK_RSV_DELOPS 5
1109 #define BTRFS_BLOCK_RSV_EMPTY 6
1110 #define BTRFS_BLOCK_RSV_TEMP 7
1112 struct btrfs_block_rsv {
1115 struct btrfs_space_info *space_info;
1117 unsigned short full;
1118 unsigned short type;
1119 unsigned short failfast;
1123 * free clusters are used to claim free space in relatively large chunks,
1124 * allowing us to do less seeky writes. They are used for all metadata
1125 * allocations and data allocations in ssd mode.
1127 struct btrfs_free_cluster {
1129 spinlock_t refill_lock;
1130 struct rb_root root;
1132 /* largest extent in this cluster */
1135 /* first extent starting offset */
1138 struct btrfs_block_group_cache *block_group;
1140 * when a cluster is allocated from a block group, we put the
1141 * cluster onto a list in the block group so that it can
1142 * be freed before the block group is freed.
1144 struct list_head block_group_list;
1147 enum btrfs_caching_type {
1149 BTRFS_CACHE_STARTED = 1,
1150 BTRFS_CACHE_FAST = 2,
1151 BTRFS_CACHE_FINISHED = 3,
1154 enum btrfs_disk_cache_state {
1155 BTRFS_DC_WRITTEN = 0,
1159 BTRFS_DC_NEED_WRITE = 4,
1162 struct btrfs_caching_control {
1163 struct list_head list;
1165 wait_queue_head_t wait;
1166 struct btrfs_work work;
1167 struct btrfs_block_group_cache *block_group;
1172 struct btrfs_block_group_cache {
1173 struct btrfs_key key;
1174 struct btrfs_block_group_item item;
1175 struct btrfs_fs_info *fs_info;
1176 struct inode *inode;
1183 u64 cache_generation;
1185 unsigned int dirty:1;
1186 unsigned int iref:1;
1188 int disk_cache_state;
1190 /* cache tracking stuff */
1192 struct btrfs_caching_control *caching_ctl;
1193 u64 last_byte_to_unpin;
1195 struct btrfs_space_info *space_info;
1197 /* free space cache stuff */
1198 struct btrfs_free_space_ctl *free_space_ctl;
1200 /* block group cache stuff */
1201 struct rb_node cache_node;
1203 /* for block groups in the same raid type */
1204 struct list_head list;
1209 /* List of struct btrfs_free_clusters for this block group.
1210 * Today it will only have one thing on it, but that may change
1212 struct list_head cluster_list;
1214 /* For delayed block group creation */
1215 struct list_head new_bg_list;
1218 /* delayed seq elem */
1220 struct list_head list;
1225 struct reloc_control;
1226 struct btrfs_device;
1227 struct btrfs_fs_devices;
1228 struct btrfs_balance_control;
1229 struct btrfs_delayed_root;
1230 struct btrfs_fs_info {
1231 u8 fsid[BTRFS_FSID_SIZE];
1232 u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
1233 struct btrfs_root *extent_root;
1234 struct btrfs_root *tree_root;
1235 struct btrfs_root *chunk_root;
1236 struct btrfs_root *dev_root;
1237 struct btrfs_root *fs_root;
1238 struct btrfs_root *csum_root;
1239 struct btrfs_root *quota_root;
1241 /* the log root tree is a directory of all the other log roots */
1242 struct btrfs_root *log_root_tree;
1244 spinlock_t fs_roots_radix_lock;
1245 struct radix_tree_root fs_roots_radix;
1247 /* block group cache stuff */
1248 spinlock_t block_group_cache_lock;
1249 struct rb_root block_group_cache_tree;
1251 /* keep track of unallocated space */
1252 spinlock_t free_chunk_lock;
1253 u64 free_chunk_space;
1255 struct extent_io_tree freed_extents[2];
1256 struct extent_io_tree *pinned_extents;
1258 /* logical->physical extent mapping */
1259 struct btrfs_mapping_tree mapping_tree;
1262 * block reservation for extent, checksum, root tree and
1263 * delayed dir index item
1265 struct btrfs_block_rsv global_block_rsv;
1266 /* block reservation for delay allocation */
1267 struct btrfs_block_rsv delalloc_block_rsv;
1268 /* block reservation for metadata operations */
1269 struct btrfs_block_rsv trans_block_rsv;
1270 /* block reservation for chunk tree */
1271 struct btrfs_block_rsv chunk_block_rsv;
1272 /* block reservation for delayed operations */
1273 struct btrfs_block_rsv delayed_block_rsv;
1275 struct btrfs_block_rsv empty_block_rsv;
1278 u64 last_trans_committed;
1281 * this is updated to the current trans every time a full commit
1282 * is required instead of the faster short fsync log commits
1284 u64 last_trans_log_full_commit;
1285 unsigned long mount_opt;
1286 unsigned long compress_type:4;
1289 struct btrfs_transaction *running_transaction;
1290 wait_queue_head_t transaction_throttle;
1291 wait_queue_head_t transaction_wait;
1292 wait_queue_head_t transaction_blocked_wait;
1293 wait_queue_head_t async_submit_wait;
1295 struct btrfs_super_block *super_copy;
1296 struct btrfs_super_block *super_for_commit;
1297 struct block_device *__bdev;
1298 struct super_block *sb;
1299 struct inode *btree_inode;
1300 struct backing_dev_info bdi;
1301 struct mutex tree_log_mutex;
1302 struct mutex transaction_kthread_mutex;
1303 struct mutex cleaner_mutex;
1304 struct mutex chunk_mutex;
1305 struct mutex volume_mutex;
1307 * this protects the ordered operations list only while we are
1308 * processing all of the entries on it. This way we make
1309 * sure the commit code doesn't find the list temporarily empty
1310 * because another function happens to be doing non-waiting preflush
1311 * before jumping into the main commit.
1313 struct mutex ordered_operations_mutex;
1314 struct rw_semaphore extent_commit_sem;
1316 struct rw_semaphore cleanup_work_sem;
1318 struct rw_semaphore subvol_sem;
1319 struct srcu_struct subvol_srcu;
1321 spinlock_t trans_lock;
1323 * the reloc mutex goes with the trans lock, it is taken
1324 * during commit to protect us from the relocation code
1326 struct mutex reloc_mutex;
1328 struct list_head trans_list;
1329 struct list_head dead_roots;
1330 struct list_head caching_block_groups;
1332 spinlock_t delayed_iput_lock;
1333 struct list_head delayed_iputs;
1335 /* this protects tree_mod_seq_list */
1336 spinlock_t tree_mod_seq_lock;
1337 atomic_t tree_mod_seq;
1338 struct list_head tree_mod_seq_list;
1339 struct seq_list tree_mod_seq_elem;
1341 /* this protects tree_mod_log */
1342 rwlock_t tree_mod_log_lock;
1343 struct rb_root tree_mod_log;
1345 atomic_t nr_async_submits;
1346 atomic_t async_submit_draining;
1347 atomic_t nr_async_bios;
1348 atomic_t async_delalloc_pages;
1349 atomic_t open_ioctl_trans;
1352 * this is used by the balancing code to wait for all the pending
1355 spinlock_t ordered_extent_lock;
1358 * all of the data=ordered extents pending writeback
1359 * these can span multiple transactions and basically include
1360 * every dirty data page that isn't from nodatacow
1362 struct list_head ordered_extents;
1365 * all of the inodes that have delalloc bytes. It is possible for
1366 * this list to be empty even when there is still dirty data=ordered
1367 * extents waiting to finish IO.
1369 struct list_head delalloc_inodes;
1372 * special rename and truncate targets that must be on disk before
1373 * we're allowed to commit. This is basically the ext3 style
1374 * data=ordered list.
1376 struct list_head ordered_operations;
1379 * there is a pool of worker threads for checksumming during writes
1380 * and a pool for checksumming after reads. This is because readers
1381 * can run with FS locks held, and the writers may be waiting for
1382 * those locks. We don't want ordering in the pending list to cause
1383 * deadlocks, and so the two are serviced separately.
1385 * A third pool does submit_bio to avoid deadlocking with the other
1388 struct btrfs_workers generic_worker;
1389 struct btrfs_workers workers;
1390 struct btrfs_workers delalloc_workers;
1391 struct btrfs_workers flush_workers;
1392 struct btrfs_workers endio_workers;
1393 struct btrfs_workers endio_meta_workers;
1394 struct btrfs_workers endio_meta_write_workers;
1395 struct btrfs_workers endio_write_workers;
1396 struct btrfs_workers endio_freespace_worker;
1397 struct btrfs_workers submit_workers;
1398 struct btrfs_workers caching_workers;
1399 struct btrfs_workers readahead_workers;
1402 * fixup workers take dirty pages that didn't properly go through
1403 * the cow mechanism and make them safe to write. It happens
1404 * for the sys_munmap function call path
1406 struct btrfs_workers fixup_workers;
1407 struct btrfs_workers delayed_workers;
1408 struct task_struct *transaction_kthread;
1409 struct task_struct *cleaner_kthread;
1410 int thread_pool_size;
1412 struct kobject super_kobj;
1413 struct completion kobj_unregister;
1416 int log_root_recovering;
1422 /* protected by the delalloc lock, used to keep from writing
1423 * metadata until there is a nice batch
1425 u64 dirty_metadata_bytes;
1426 struct list_head dirty_cowonly_roots;
1428 struct btrfs_fs_devices *fs_devices;
1431 * the space_info list is almost entirely read only. It only changes
1432 * when we add a new raid type to the FS, and that happens
1433 * very rarely. RCU is used to protect it.
1435 struct list_head space_info;
1437 struct btrfs_space_info *data_sinfo;
1439 struct reloc_control *reloc_ctl;
1441 spinlock_t delalloc_lock;
1444 /* data_alloc_cluster is only used in ssd mode */
1445 struct btrfs_free_cluster data_alloc_cluster;
1447 /* all metadata allocations go through this cluster */
1448 struct btrfs_free_cluster meta_alloc_cluster;
1450 /* auto defrag inodes go here */
1451 spinlock_t defrag_inodes_lock;
1452 struct rb_root defrag_inodes;
1453 atomic_t defrag_running;
1456 * these three are in extended format (availability of single
1457 * chunks is denoted by BTRFS_AVAIL_ALLOC_BIT_SINGLE bit, other
1458 * types are denoted by corresponding BTRFS_BLOCK_GROUP_* bits)
1460 u64 avail_data_alloc_bits;
1461 u64 avail_metadata_alloc_bits;
1462 u64 avail_system_alloc_bits;
1464 /* restriper state */
1465 spinlock_t balance_lock;
1466 struct mutex balance_mutex;
1467 atomic_t balance_running;
1468 atomic_t balance_pause_req;
1469 atomic_t balance_cancel_req;
1470 struct btrfs_balance_control *balance_ctl;
1471 wait_queue_head_t balance_wait_q;
1473 unsigned data_chunk_allocations;
1474 unsigned metadata_ratio;
1478 /* private scrub information */
1479 struct mutex scrub_lock;
1480 atomic_t scrubs_running;
1481 atomic_t scrub_pause_req;
1482 atomic_t scrubs_paused;
1483 atomic_t scrub_cancel_req;
1484 wait_queue_head_t scrub_pause_wait;
1485 struct rw_semaphore scrub_super_lock;
1486 int scrub_workers_refcnt;
1487 struct btrfs_workers scrub_workers;
1488 struct btrfs_workers scrub_wr_completion_workers;
1489 struct btrfs_workers scrub_nocow_workers;
1491 #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY
1492 u32 check_integrity_print_mask;
1497 unsigned int quota_enabled:1;
1500 * quota_enabled only changes state after a commit. This holds the
1503 unsigned int pending_quota_state:1;
1505 /* is qgroup tracking in a consistent state? */
1508 /* holds configuration and tracking. Protected by qgroup_lock */
1509 struct rb_root qgroup_tree;
1510 spinlock_t qgroup_lock;
1512 /* list of dirty qgroups to be written at next commit */
1513 struct list_head dirty_qgroups;
1515 /* used by btrfs_qgroup_record_ref for an efficient tree traversal */
1518 /* filesystem state */
1521 struct btrfs_delayed_root *delayed_root;
1523 /* readahead tree */
1524 spinlock_t reada_lock;
1525 struct radix_tree_root reada_tree;
1527 /* next backup root to be overwritten */
1528 int backup_root_index;
1530 int num_tolerated_disk_barrier_failures;
1532 /* device replace state */
1533 struct btrfs_dev_replace dev_replace;
1535 atomic_t mutually_exclusive_operation_running;
1539 * in ram representation of the tree. extent_root is used for all allocations
1540 * and for the extent tree extent_root root.
1543 struct extent_buffer *node;
1545 struct extent_buffer *commit_root;
1546 struct btrfs_root *log_root;
1547 struct btrfs_root *reloc_root;
1549 struct btrfs_root_item root_item;
1550 struct btrfs_key root_key;
1551 struct btrfs_fs_info *fs_info;
1552 struct extent_io_tree dirty_log_pages;
1554 struct kobject root_kobj;
1555 struct completion kobj_unregister;
1556 struct mutex objectid_mutex;
1558 spinlock_t accounting_lock;
1559 struct btrfs_block_rsv *block_rsv;
1561 /* free ino cache stuff */
1562 struct mutex fs_commit_mutex;
1563 struct btrfs_free_space_ctl *free_ino_ctl;
1564 enum btrfs_caching_type cached;
1565 spinlock_t cache_lock;
1566 wait_queue_head_t cache_wait;
1567 struct btrfs_free_space_ctl *free_ino_pinned;
1569 struct inode *cache_inode;
1571 struct mutex log_mutex;
1572 wait_queue_head_t log_writer_wait;
1573 wait_queue_head_t log_commit_wait[2];
1574 atomic_t log_writers;
1575 atomic_t log_commit[2];
1577 unsigned long log_transid;
1578 unsigned long last_log_commit;
1579 pid_t log_start_pid;
1580 bool log_multiple_pids;
1585 /* data allocations are done in sectorsize units */
1588 /* node allocations are done in nodesize units */
1591 /* leaf allocations are done in leafsize units */
1598 u64 highest_objectid;
1600 /* btrfs_record_root_in_trans is a multi-step process,
1601 * and it can race with the balancing code. But the
1602 * race is very small, and only the first time the root
1603 * is added to each transaction. So in_trans_setup
1604 * is used to tell us when more checks are required
1606 unsigned long in_trans_setup;
1611 u64 defrag_trans_start;
1612 struct btrfs_key defrag_progress;
1613 struct btrfs_key defrag_max;
1617 /* the dirty list is only used by non-reference counted roots */
1618 struct list_head dirty_list;
1620 struct list_head root_list;
1622 spinlock_t orphan_lock;
1623 atomic_t orphan_inodes;
1624 struct btrfs_block_rsv *orphan_block_rsv;
1625 int orphan_item_inserted;
1626 int orphan_cleanup_state;
1628 spinlock_t inode_lock;
1629 /* red-black tree that keeps track of in-memory inodes */
1630 struct rb_root inode_tree;
1633 * radix tree that keeps track of delayed nodes of every inode,
1634 * protected by inode_lock
1636 struct radix_tree_root delayed_nodes_tree;
1638 * right now this just gets used so that a root has its own devid
1639 * for stat. It may be used for more later
1645 spinlock_t root_times_lock;
1648 struct btrfs_ioctl_defrag_range_args {
1649 /* start of the defrag operation */
1652 /* number of bytes to defrag, use (u64)-1 to say all */
1656 * flags for the operation, which can include turning
1657 * on compression for this one defrag
1662 * any extent bigger than this will be considered
1663 * already defragged. Use 0 to take the kernel default
1664 * Use 1 to say every single extent must be rewritten
1666 __u32 extent_thresh;
1669 * which compression method to use if turning on compression
1670 * for this defrag operation. If unspecified, zlib will
1673 __u32 compress_type;
1675 /* spare for later */
1681 * inode items have the data typically returned from stat and store other
1682 * info about object characteristics. There is one for every file and dir in
1685 #define BTRFS_INODE_ITEM_KEY 1
1686 #define BTRFS_INODE_REF_KEY 12
1687 #define BTRFS_INODE_EXTREF_KEY 13
1688 #define BTRFS_XATTR_ITEM_KEY 24
1689 #define BTRFS_ORPHAN_ITEM_KEY 48
1690 /* reserve 2-15 close to the inode for later flexibility */
1693 * dir items are the name -> inode pointers in a directory. There is one
1694 * for every name in a directory.
1696 #define BTRFS_DIR_LOG_ITEM_KEY 60
1697 #define BTRFS_DIR_LOG_INDEX_KEY 72
1698 #define BTRFS_DIR_ITEM_KEY 84
1699 #define BTRFS_DIR_INDEX_KEY 96
1701 * extent data is for file data
1703 #define BTRFS_EXTENT_DATA_KEY 108
1706 * extent csums are stored in a separate tree and hold csums for
1707 * an entire extent on disk.
1709 #define BTRFS_EXTENT_CSUM_KEY 128
1712 * root items point to tree roots. They are typically in the root
1713 * tree used by the super block to find all the other trees
1715 #define BTRFS_ROOT_ITEM_KEY 132
1718 * root backrefs tie subvols and snapshots to the directory entries that
1721 #define BTRFS_ROOT_BACKREF_KEY 144
1724 * root refs make a fast index for listing all of the snapshots and
1725 * subvolumes referenced by a given root. They point directly to the
1726 * directory item in the root that references the subvol
1728 #define BTRFS_ROOT_REF_KEY 156
1731 * extent items are in the extent map tree. These record which blocks
1732 * are used, and how many references there are to each block
1734 #define BTRFS_EXTENT_ITEM_KEY 168
1736 #define BTRFS_TREE_BLOCK_REF_KEY 176
1738 #define BTRFS_EXTENT_DATA_REF_KEY 178
1740 #define BTRFS_EXTENT_REF_V0_KEY 180
1742 #define BTRFS_SHARED_BLOCK_REF_KEY 182
1744 #define BTRFS_SHARED_DATA_REF_KEY 184
1747 * block groups give us hints into the extent allocation trees. Which
1748 * blocks are free etc etc
1750 #define BTRFS_BLOCK_GROUP_ITEM_KEY 192
1752 #define BTRFS_DEV_EXTENT_KEY 204
1753 #define BTRFS_DEV_ITEM_KEY 216
1754 #define BTRFS_CHUNK_ITEM_KEY 228
1757 * Records the overall state of the qgroups.
1758 * There's only one instance of this key present,
1759 * (0, BTRFS_QGROUP_STATUS_KEY, 0)
1761 #define BTRFS_QGROUP_STATUS_KEY 240
1763 * Records the currently used space of the qgroup.
1764 * One key per qgroup, (0, BTRFS_QGROUP_INFO_KEY, qgroupid).
1766 #define BTRFS_QGROUP_INFO_KEY 242
1768 * Contains the user configured limits for the qgroup.
1769 * One key per qgroup, (0, BTRFS_QGROUP_LIMIT_KEY, qgroupid).
1771 #define BTRFS_QGROUP_LIMIT_KEY 244
1773 * Records the child-parent relationship of qgroups. For
1774 * each relation, 2 keys are present:
1775 * (childid, BTRFS_QGROUP_RELATION_KEY, parentid)
1776 * (parentid, BTRFS_QGROUP_RELATION_KEY, childid)
1778 #define BTRFS_QGROUP_RELATION_KEY 246
1780 #define BTRFS_BALANCE_ITEM_KEY 248
1783 * Persistantly stores the io stats in the device tree.
1784 * One key for all stats, (0, BTRFS_DEV_STATS_KEY, devid).
1786 #define BTRFS_DEV_STATS_KEY 249
1789 * Persistantly stores the device replace state in the device tree.
1790 * The key is built like this: (0, BTRFS_DEV_REPLACE_KEY, 0).
1792 #define BTRFS_DEV_REPLACE_KEY 250
1795 * string items are for debugging. They just store a short string of
1798 #define BTRFS_STRING_ITEM_KEY 253
1801 * Flags for mount options.
1803 * Note: don't forget to add new options to btrfs_show_options()
1805 #define BTRFS_MOUNT_NODATASUM (1 << 0)
1806 #define BTRFS_MOUNT_NODATACOW (1 << 1)
1807 #define BTRFS_MOUNT_NOBARRIER (1 << 2)
1808 #define BTRFS_MOUNT_SSD (1 << 3)
1809 #define BTRFS_MOUNT_DEGRADED (1 << 4)
1810 #define BTRFS_MOUNT_COMPRESS (1 << 5)
1811 #define BTRFS_MOUNT_NOTREELOG (1 << 6)
1812 #define BTRFS_MOUNT_FLUSHONCOMMIT (1 << 7)
1813 #define BTRFS_MOUNT_SSD_SPREAD (1 << 8)
1814 #define BTRFS_MOUNT_NOSSD (1 << 9)
1815 #define BTRFS_MOUNT_DISCARD (1 << 10)
1816 #define BTRFS_MOUNT_FORCE_COMPRESS (1 << 11)
1817 #define BTRFS_MOUNT_SPACE_CACHE (1 << 12)
1818 #define BTRFS_MOUNT_CLEAR_CACHE (1 << 13)
1819 #define BTRFS_MOUNT_USER_SUBVOL_RM_ALLOWED (1 << 14)
1820 #define BTRFS_MOUNT_ENOSPC_DEBUG (1 << 15)
1821 #define BTRFS_MOUNT_AUTO_DEFRAG (1 << 16)
1822 #define BTRFS_MOUNT_INODE_MAP_CACHE (1 << 17)
1823 #define BTRFS_MOUNT_RECOVERY (1 << 18)
1824 #define BTRFS_MOUNT_SKIP_BALANCE (1 << 19)
1825 #define BTRFS_MOUNT_CHECK_INTEGRITY (1 << 20)
1826 #define BTRFS_MOUNT_CHECK_INTEGRITY_INCLUDING_EXTENT_DATA (1 << 21)
1827 #define BTRFS_MOUNT_PANIC_ON_FATAL_ERROR (1 << 22)
1829 #define btrfs_clear_opt(o, opt) ((o) &= ~BTRFS_MOUNT_##opt)
1830 #define btrfs_set_opt(o, opt) ((o) |= BTRFS_MOUNT_##opt)
1831 #define btrfs_test_opt(root, opt) ((root)->fs_info->mount_opt & \
1836 #define BTRFS_INODE_NODATASUM (1 << 0)
1837 #define BTRFS_INODE_NODATACOW (1 << 1)
1838 #define BTRFS_INODE_READONLY (1 << 2)
1839 #define BTRFS_INODE_NOCOMPRESS (1 << 3)
1840 #define BTRFS_INODE_PREALLOC (1 << 4)
1841 #define BTRFS_INODE_SYNC (1 << 5)
1842 #define BTRFS_INODE_IMMUTABLE (1 << 6)
1843 #define BTRFS_INODE_APPEND (1 << 7)
1844 #define BTRFS_INODE_NODUMP (1 << 8)
1845 #define BTRFS_INODE_NOATIME (1 << 9)
1846 #define BTRFS_INODE_DIRSYNC (1 << 10)
1847 #define BTRFS_INODE_COMPRESS (1 << 11)
1849 #define BTRFS_INODE_ROOT_ITEM_INIT (1 << 31)
1851 struct btrfs_map_token {
1852 struct extent_buffer *eb;
1854 unsigned long offset;
1857 static inline void btrfs_init_map_token (struct btrfs_map_token *token)
1859 memset(token, 0, sizeof(*token));
1862 /* some macros to generate set/get funcs for the struct fields. This
1863 * assumes there is a lefoo_to_cpu for every type, so lets make a simple
1866 #define le8_to_cpu(v) (v)
1867 #define cpu_to_le8(v) (v)
1870 #define read_eb_member(eb, ptr, type, member, result) ( \
1871 read_extent_buffer(eb, (char *)(result), \
1872 ((unsigned long)(ptr)) + \
1873 offsetof(type, member), \
1874 sizeof(((type *)0)->member)))
1876 #define write_eb_member(eb, ptr, type, member, result) ( \
1877 write_extent_buffer(eb, (char *)(result), \
1878 ((unsigned long)(ptr)) + \
1879 offsetof(type, member), \
1880 sizeof(((type *)0)->member)))
1882 #define DECLARE_BTRFS_SETGET_BITS(bits) \
1883 u##bits btrfs_get_token_##bits(struct extent_buffer *eb, void *ptr, \
1884 unsigned long off, \
1885 struct btrfs_map_token *token); \
1886 void btrfs_set_token_##bits(struct extent_buffer *eb, void *ptr, \
1887 unsigned long off, u##bits val, \
1888 struct btrfs_map_token *token); \
1889 static inline u##bits btrfs_get_##bits(struct extent_buffer *eb, void *ptr, \
1890 unsigned long off) \
1892 return btrfs_get_token_##bits(eb, ptr, off, NULL); \
1894 static inline void btrfs_set_##bits(struct extent_buffer *eb, void *ptr, \
1895 unsigned long off, u##bits val) \
1897 btrfs_set_token_##bits(eb, ptr, off, val, NULL); \
1900 DECLARE_BTRFS_SETGET_BITS(8)
1901 DECLARE_BTRFS_SETGET_BITS(16)
1902 DECLARE_BTRFS_SETGET_BITS(32)
1903 DECLARE_BTRFS_SETGET_BITS(64)
1905 #define BTRFS_SETGET_FUNCS(name, type, member, bits) \
1906 static inline u##bits btrfs_##name(struct extent_buffer *eb, type *s) \
1908 BUILD_BUG_ON(sizeof(u##bits) != sizeof(((type *)0))->member); \
1909 return btrfs_get_##bits(eb, s, offsetof(type, member)); \
1911 static inline void btrfs_set_##name(struct extent_buffer *eb, type *s, \
1914 BUILD_BUG_ON(sizeof(u##bits) != sizeof(((type *)0))->member); \
1915 btrfs_set_##bits(eb, s, offsetof(type, member), val); \
1917 static inline u##bits btrfs_token_##name(struct extent_buffer *eb, type *s, \
1918 struct btrfs_map_token *token) \
1920 BUILD_BUG_ON(sizeof(u##bits) != sizeof(((type *)0))->member); \
1921 return btrfs_get_token_##bits(eb, s, offsetof(type, member), token); \
1923 static inline void btrfs_set_token_##name(struct extent_buffer *eb, \
1924 type *s, u##bits val, \
1925 struct btrfs_map_token *token) \
1927 BUILD_BUG_ON(sizeof(u##bits) != sizeof(((type *)0))->member); \
1928 btrfs_set_token_##bits(eb, s, offsetof(type, member), val, token); \
1931 #define BTRFS_SETGET_HEADER_FUNCS(name, type, member, bits) \
1932 static inline u##bits btrfs_##name(struct extent_buffer *eb) \
1934 type *p = page_address(eb->pages[0]); \
1935 u##bits res = le##bits##_to_cpu(p->member); \
1938 static inline void btrfs_set_##name(struct extent_buffer *eb, \
1941 type *p = page_address(eb->pages[0]); \
1942 p->member = cpu_to_le##bits(val); \
1945 #define BTRFS_SETGET_STACK_FUNCS(name, type, member, bits) \
1946 static inline u##bits btrfs_##name(type *s) \
1948 return le##bits##_to_cpu(s->member); \
1950 static inline void btrfs_set_##name(type *s, u##bits val) \
1952 s->member = cpu_to_le##bits(val); \
1955 BTRFS_SETGET_FUNCS(device_type, struct btrfs_dev_item, type, 64);
1956 BTRFS_SETGET_FUNCS(device_total_bytes, struct btrfs_dev_item, total_bytes, 64);
1957 BTRFS_SETGET_FUNCS(device_bytes_used, struct btrfs_dev_item, bytes_used, 64);
1958 BTRFS_SETGET_FUNCS(device_io_align, struct btrfs_dev_item, io_align, 32);
1959 BTRFS_SETGET_FUNCS(device_io_width, struct btrfs_dev_item, io_width, 32);
1960 BTRFS_SETGET_FUNCS(device_start_offset, struct btrfs_dev_item,
1962 BTRFS_SETGET_FUNCS(device_sector_size, struct btrfs_dev_item, sector_size, 32);
1963 BTRFS_SETGET_FUNCS(device_id, struct btrfs_dev_item, devid, 64);
1964 BTRFS_SETGET_FUNCS(device_group, struct btrfs_dev_item, dev_group, 32);
1965 BTRFS_SETGET_FUNCS(device_seek_speed, struct btrfs_dev_item, seek_speed, 8);
1966 BTRFS_SETGET_FUNCS(device_bandwidth, struct btrfs_dev_item, bandwidth, 8);
1967 BTRFS_SETGET_FUNCS(device_generation, struct btrfs_dev_item, generation, 64);
1969 BTRFS_SETGET_STACK_FUNCS(stack_device_type, struct btrfs_dev_item, type, 64);
1970 BTRFS_SETGET_STACK_FUNCS(stack_device_total_bytes, struct btrfs_dev_item,
1972 BTRFS_SETGET_STACK_FUNCS(stack_device_bytes_used, struct btrfs_dev_item,
1974 BTRFS_SETGET_STACK_FUNCS(stack_device_io_align, struct btrfs_dev_item,
1976 BTRFS_SETGET_STACK_FUNCS(stack_device_io_width, struct btrfs_dev_item,
1978 BTRFS_SETGET_STACK_FUNCS(stack_device_sector_size, struct btrfs_dev_item,
1980 BTRFS_SETGET_STACK_FUNCS(stack_device_id, struct btrfs_dev_item, devid, 64);
1981 BTRFS_SETGET_STACK_FUNCS(stack_device_group, struct btrfs_dev_item,
1983 BTRFS_SETGET_STACK_FUNCS(stack_device_seek_speed, struct btrfs_dev_item,
1985 BTRFS_SETGET_STACK_FUNCS(stack_device_bandwidth, struct btrfs_dev_item,
1987 BTRFS_SETGET_STACK_FUNCS(stack_device_generation, struct btrfs_dev_item,
1990 static inline char *btrfs_device_uuid(struct btrfs_dev_item *d)
1992 return (char *)d + offsetof(struct btrfs_dev_item, uuid);
1995 static inline char *btrfs_device_fsid(struct btrfs_dev_item *d)
1997 return (char *)d + offsetof(struct btrfs_dev_item, fsid);
2000 BTRFS_SETGET_FUNCS(chunk_length, struct btrfs_chunk, length, 64);
2001 BTRFS_SETGET_FUNCS(chunk_owner, struct btrfs_chunk, owner, 64);
2002 BTRFS_SETGET_FUNCS(chunk_stripe_len, struct btrfs_chunk, stripe_len, 64);
2003 BTRFS_SETGET_FUNCS(chunk_io_align, struct btrfs_chunk, io_align, 32);
2004 BTRFS_SETGET_FUNCS(chunk_io_width, struct btrfs_chunk, io_width, 32);
2005 BTRFS_SETGET_FUNCS(chunk_sector_size, struct btrfs_chunk, sector_size, 32);
2006 BTRFS_SETGET_FUNCS(chunk_type, struct btrfs_chunk, type, 64);
2007 BTRFS_SETGET_FUNCS(chunk_num_stripes, struct btrfs_chunk, num_stripes, 16);
2008 BTRFS_SETGET_FUNCS(chunk_sub_stripes, struct btrfs_chunk, sub_stripes, 16);
2009 BTRFS_SETGET_FUNCS(stripe_devid, struct btrfs_stripe, devid, 64);
2010 BTRFS_SETGET_FUNCS(stripe_offset, struct btrfs_stripe, offset, 64);
2012 static inline char *btrfs_stripe_dev_uuid(struct btrfs_stripe *s)
2014 return (char *)s + offsetof(struct btrfs_stripe, dev_uuid);
2017 BTRFS_SETGET_STACK_FUNCS(stack_chunk_length, struct btrfs_chunk, length, 64);
2018 BTRFS_SETGET_STACK_FUNCS(stack_chunk_owner, struct btrfs_chunk, owner, 64);
2019 BTRFS_SETGET_STACK_FUNCS(stack_chunk_stripe_len, struct btrfs_chunk,
2021 BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_align, struct btrfs_chunk,
2023 BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_width, struct btrfs_chunk,
2025 BTRFS_SETGET_STACK_FUNCS(stack_chunk_sector_size, struct btrfs_chunk,
2027 BTRFS_SETGET_STACK_FUNCS(stack_chunk_type, struct btrfs_chunk, type, 64);
2028 BTRFS_SETGET_STACK_FUNCS(stack_chunk_num_stripes, struct btrfs_chunk,
2030 BTRFS_SETGET_STACK_FUNCS(stack_chunk_sub_stripes, struct btrfs_chunk,
2032 BTRFS_SETGET_STACK_FUNCS(stack_stripe_devid, struct btrfs_stripe, devid, 64);
2033 BTRFS_SETGET_STACK_FUNCS(stack_stripe_offset, struct btrfs_stripe, offset, 64);
2035 static inline struct btrfs_stripe *btrfs_stripe_nr(struct btrfs_chunk *c,
2038 unsigned long offset = (unsigned long)c;
2039 offset += offsetof(struct btrfs_chunk, stripe);
2040 offset += nr * sizeof(struct btrfs_stripe);
2041 return (struct btrfs_stripe *)offset;
2044 static inline char *btrfs_stripe_dev_uuid_nr(struct btrfs_chunk *c, int nr)
2046 return btrfs_stripe_dev_uuid(btrfs_stripe_nr(c, nr));
2049 static inline u64 btrfs_stripe_offset_nr(struct extent_buffer *eb,
2050 struct btrfs_chunk *c, int nr)
2052 return btrfs_stripe_offset(eb, btrfs_stripe_nr(c, nr));
2055 static inline u64 btrfs_stripe_devid_nr(struct extent_buffer *eb,
2056 struct btrfs_chunk *c, int nr)
2058 return btrfs_stripe_devid(eb, btrfs_stripe_nr(c, nr));
2061 /* struct btrfs_block_group_item */
2062 BTRFS_SETGET_STACK_FUNCS(block_group_used, struct btrfs_block_group_item,
2064 BTRFS_SETGET_FUNCS(disk_block_group_used, struct btrfs_block_group_item,
2066 BTRFS_SETGET_STACK_FUNCS(block_group_chunk_objectid,
2067 struct btrfs_block_group_item, chunk_objectid, 64);
2069 BTRFS_SETGET_FUNCS(disk_block_group_chunk_objectid,
2070 struct btrfs_block_group_item, chunk_objectid, 64);
2071 BTRFS_SETGET_FUNCS(disk_block_group_flags,
2072 struct btrfs_block_group_item, flags, 64);
2073 BTRFS_SETGET_STACK_FUNCS(block_group_flags,
2074 struct btrfs_block_group_item, flags, 64);
2076 /* struct btrfs_inode_ref */
2077 BTRFS_SETGET_FUNCS(inode_ref_name_len, struct btrfs_inode_ref, name_len, 16);
2078 BTRFS_SETGET_FUNCS(inode_ref_index, struct btrfs_inode_ref, index, 64);
2080 /* struct btrfs_inode_extref */
2081 BTRFS_SETGET_FUNCS(inode_extref_parent, struct btrfs_inode_extref,
2082 parent_objectid, 64);
2083 BTRFS_SETGET_FUNCS(inode_extref_name_len, struct btrfs_inode_extref,
2085 BTRFS_SETGET_FUNCS(inode_extref_index, struct btrfs_inode_extref, index, 64);
2087 /* struct btrfs_inode_item */
2088 BTRFS_SETGET_FUNCS(inode_generation, struct btrfs_inode_item, generation, 64);
2089 BTRFS_SETGET_FUNCS(inode_sequence, struct btrfs_inode_item, sequence, 64);
2090 BTRFS_SETGET_FUNCS(inode_transid, struct btrfs_inode_item, transid, 64);
2091 BTRFS_SETGET_FUNCS(inode_size, struct btrfs_inode_item, size, 64);
2092 BTRFS_SETGET_FUNCS(inode_nbytes, struct btrfs_inode_item, nbytes, 64);
2093 BTRFS_SETGET_FUNCS(inode_block_group, struct btrfs_inode_item, block_group, 64);
2094 BTRFS_SETGET_FUNCS(inode_nlink, struct btrfs_inode_item, nlink, 32);
2095 BTRFS_SETGET_FUNCS(inode_uid, struct btrfs_inode_item, uid, 32);
2096 BTRFS_SETGET_FUNCS(inode_gid, struct btrfs_inode_item, gid, 32);
2097 BTRFS_SETGET_FUNCS(inode_mode, struct btrfs_inode_item, mode, 32);
2098 BTRFS_SETGET_FUNCS(inode_rdev, struct btrfs_inode_item, rdev, 64);
2099 BTRFS_SETGET_FUNCS(inode_flags, struct btrfs_inode_item, flags, 64);
2101 static inline struct btrfs_timespec *
2102 btrfs_inode_atime(struct btrfs_inode_item *inode_item)
2104 unsigned long ptr = (unsigned long)inode_item;
2105 ptr += offsetof(struct btrfs_inode_item, atime);
2106 return (struct btrfs_timespec *)ptr;
2109 static inline struct btrfs_timespec *
2110 btrfs_inode_mtime(struct btrfs_inode_item *inode_item)
2112 unsigned long ptr = (unsigned long)inode_item;
2113 ptr += offsetof(struct btrfs_inode_item, mtime);
2114 return (struct btrfs_timespec *)ptr;
2117 static inline struct btrfs_timespec *
2118 btrfs_inode_ctime(struct btrfs_inode_item *inode_item)
2120 unsigned long ptr = (unsigned long)inode_item;
2121 ptr += offsetof(struct btrfs_inode_item, ctime);
2122 return (struct btrfs_timespec *)ptr;
2125 BTRFS_SETGET_FUNCS(timespec_sec, struct btrfs_timespec, sec, 64);
2126 BTRFS_SETGET_FUNCS(timespec_nsec, struct btrfs_timespec, nsec, 32);
2128 /* struct btrfs_dev_extent */
2129 BTRFS_SETGET_FUNCS(dev_extent_chunk_tree, struct btrfs_dev_extent,
2131 BTRFS_SETGET_FUNCS(dev_extent_chunk_objectid, struct btrfs_dev_extent,
2132 chunk_objectid, 64);
2133 BTRFS_SETGET_FUNCS(dev_extent_chunk_offset, struct btrfs_dev_extent,
2135 BTRFS_SETGET_FUNCS(dev_extent_length, struct btrfs_dev_extent, length, 64);
2137 static inline u8 *btrfs_dev_extent_chunk_tree_uuid(struct btrfs_dev_extent *dev)
2139 unsigned long ptr = offsetof(struct btrfs_dev_extent, chunk_tree_uuid);
2140 return (u8 *)((unsigned long)dev + ptr);
2143 BTRFS_SETGET_FUNCS(extent_refs, struct btrfs_extent_item, refs, 64);
2144 BTRFS_SETGET_FUNCS(extent_generation, struct btrfs_extent_item,
2146 BTRFS_SETGET_FUNCS(extent_flags, struct btrfs_extent_item, flags, 64);
2148 BTRFS_SETGET_FUNCS(extent_refs_v0, struct btrfs_extent_item_v0, refs, 32);
2151 BTRFS_SETGET_FUNCS(tree_block_level, struct btrfs_tree_block_info, level, 8);
2153 static inline void btrfs_tree_block_key(struct extent_buffer *eb,
2154 struct btrfs_tree_block_info *item,
2155 struct btrfs_disk_key *key)
2157 read_eb_member(eb, item, struct btrfs_tree_block_info, key, key);
2160 static inline void btrfs_set_tree_block_key(struct extent_buffer *eb,
2161 struct btrfs_tree_block_info *item,
2162 struct btrfs_disk_key *key)
2164 write_eb_member(eb, item, struct btrfs_tree_block_info, key, key);
2167 BTRFS_SETGET_FUNCS(extent_data_ref_root, struct btrfs_extent_data_ref,
2169 BTRFS_SETGET_FUNCS(extent_data_ref_objectid, struct btrfs_extent_data_ref,
2171 BTRFS_SETGET_FUNCS(extent_data_ref_offset, struct btrfs_extent_data_ref,
2173 BTRFS_SETGET_FUNCS(extent_data_ref_count, struct btrfs_extent_data_ref,
2176 BTRFS_SETGET_FUNCS(shared_data_ref_count, struct btrfs_shared_data_ref,
2179 BTRFS_SETGET_FUNCS(extent_inline_ref_type, struct btrfs_extent_inline_ref,
2181 BTRFS_SETGET_FUNCS(extent_inline_ref_offset, struct btrfs_extent_inline_ref,
2184 static inline u32 btrfs_extent_inline_ref_size(int type)
2186 if (type == BTRFS_TREE_BLOCK_REF_KEY ||
2187 type == BTRFS_SHARED_BLOCK_REF_KEY)
2188 return sizeof(struct btrfs_extent_inline_ref);
2189 if (type == BTRFS_SHARED_DATA_REF_KEY)
2190 return sizeof(struct btrfs_shared_data_ref) +
2191 sizeof(struct btrfs_extent_inline_ref);
2192 if (type == BTRFS_EXTENT_DATA_REF_KEY)
2193 return sizeof(struct btrfs_extent_data_ref) +
2194 offsetof(struct btrfs_extent_inline_ref, offset);
2199 BTRFS_SETGET_FUNCS(ref_root_v0, struct btrfs_extent_ref_v0, root, 64);
2200 BTRFS_SETGET_FUNCS(ref_generation_v0, struct btrfs_extent_ref_v0,
2202 BTRFS_SETGET_FUNCS(ref_objectid_v0, struct btrfs_extent_ref_v0, objectid, 64);
2203 BTRFS_SETGET_FUNCS(ref_count_v0, struct btrfs_extent_ref_v0, count, 32);
2205 /* struct btrfs_node */
2206 BTRFS_SETGET_FUNCS(key_blockptr, struct btrfs_key_ptr, blockptr, 64);
2207 BTRFS_SETGET_FUNCS(key_generation, struct btrfs_key_ptr, generation, 64);
2209 static inline u64 btrfs_node_blockptr(struct extent_buffer *eb, int nr)
2212 ptr = offsetof(struct btrfs_node, ptrs) +
2213 sizeof(struct btrfs_key_ptr) * nr;
2214 return btrfs_key_blockptr(eb, (struct btrfs_key_ptr *)ptr);
2217 static inline void btrfs_set_node_blockptr(struct extent_buffer *eb,
2221 ptr = offsetof(struct btrfs_node, ptrs) +
2222 sizeof(struct btrfs_key_ptr) * nr;
2223 btrfs_set_key_blockptr(eb, (struct btrfs_key_ptr *)ptr, val);
2226 static inline u64 btrfs_node_ptr_generation(struct extent_buffer *eb, int nr)
2229 ptr = offsetof(struct btrfs_node, ptrs) +
2230 sizeof(struct btrfs_key_ptr) * nr;
2231 return btrfs_key_generation(eb, (struct btrfs_key_ptr *)ptr);
2234 static inline void btrfs_set_node_ptr_generation(struct extent_buffer *eb,
2238 ptr = offsetof(struct btrfs_node, ptrs) +
2239 sizeof(struct btrfs_key_ptr) * nr;
2240 btrfs_set_key_generation(eb, (struct btrfs_key_ptr *)ptr, val);
2243 static inline unsigned long btrfs_node_key_ptr_offset(int nr)
2245 return offsetof(struct btrfs_node, ptrs) +
2246 sizeof(struct btrfs_key_ptr) * nr;
2249 void btrfs_node_key(struct extent_buffer *eb,
2250 struct btrfs_disk_key *disk_key, int nr);
2252 static inline void btrfs_set_node_key(struct extent_buffer *eb,
2253 struct btrfs_disk_key *disk_key, int nr)
2256 ptr = btrfs_node_key_ptr_offset(nr);
2257 write_eb_member(eb, (struct btrfs_key_ptr *)ptr,
2258 struct btrfs_key_ptr, key, disk_key);
2261 /* struct btrfs_item */
2262 BTRFS_SETGET_FUNCS(item_offset, struct btrfs_item, offset, 32);
2263 BTRFS_SETGET_FUNCS(item_size, struct btrfs_item, size, 32);
2265 static inline unsigned long btrfs_item_nr_offset(int nr)
2267 return offsetof(struct btrfs_leaf, items) +
2268 sizeof(struct btrfs_item) * nr;
2271 static inline struct btrfs_item *btrfs_item_nr(struct extent_buffer *eb,
2274 return (struct btrfs_item *)btrfs_item_nr_offset(nr);
2277 static inline u32 btrfs_item_end(struct extent_buffer *eb,
2278 struct btrfs_item *item)
2280 return btrfs_item_offset(eb, item) + btrfs_item_size(eb, item);
2283 static inline u32 btrfs_item_end_nr(struct extent_buffer *eb, int nr)
2285 return btrfs_item_end(eb, btrfs_item_nr(eb, nr));
2288 static inline u32 btrfs_item_offset_nr(struct extent_buffer *eb, int nr)
2290 return btrfs_item_offset(eb, btrfs_item_nr(eb, nr));
2293 static inline u32 btrfs_item_size_nr(struct extent_buffer *eb, int nr)
2295 return btrfs_item_size(eb, btrfs_item_nr(eb, nr));
2298 static inline void btrfs_item_key(struct extent_buffer *eb,
2299 struct btrfs_disk_key *disk_key, int nr)
2301 struct btrfs_item *item = btrfs_item_nr(eb, nr);
2302 read_eb_member(eb, item, struct btrfs_item, key, disk_key);
2305 static inline void btrfs_set_item_key(struct extent_buffer *eb,
2306 struct btrfs_disk_key *disk_key, int nr)
2308 struct btrfs_item *item = btrfs_item_nr(eb, nr);
2309 write_eb_member(eb, item, struct btrfs_item, key, disk_key);
2312 BTRFS_SETGET_FUNCS(dir_log_end, struct btrfs_dir_log_item, end, 64);
2315 * struct btrfs_root_ref
2317 BTRFS_SETGET_FUNCS(root_ref_dirid, struct btrfs_root_ref, dirid, 64);
2318 BTRFS_SETGET_FUNCS(root_ref_sequence, struct btrfs_root_ref, sequence, 64);
2319 BTRFS_SETGET_FUNCS(root_ref_name_len, struct btrfs_root_ref, name_len, 16);
2321 /* struct btrfs_dir_item */
2322 BTRFS_SETGET_FUNCS(dir_data_len, struct btrfs_dir_item, data_len, 16);
2323 BTRFS_SETGET_FUNCS(dir_type, struct btrfs_dir_item, type, 8);
2324 BTRFS_SETGET_FUNCS(dir_name_len, struct btrfs_dir_item, name_len, 16);
2325 BTRFS_SETGET_FUNCS(dir_transid, struct btrfs_dir_item, transid, 64);
2327 static inline void btrfs_dir_item_key(struct extent_buffer *eb,
2328 struct btrfs_dir_item *item,
2329 struct btrfs_disk_key *key)
2331 read_eb_member(eb, item, struct btrfs_dir_item, location, key);
2334 static inline void btrfs_set_dir_item_key(struct extent_buffer *eb,
2335 struct btrfs_dir_item *item,
2336 struct btrfs_disk_key *key)
2338 write_eb_member(eb, item, struct btrfs_dir_item, location, key);
2341 BTRFS_SETGET_FUNCS(free_space_entries, struct btrfs_free_space_header,
2343 BTRFS_SETGET_FUNCS(free_space_bitmaps, struct btrfs_free_space_header,
2345 BTRFS_SETGET_FUNCS(free_space_generation, struct btrfs_free_space_header,
2348 static inline void btrfs_free_space_key(struct extent_buffer *eb,
2349 struct btrfs_free_space_header *h,
2350 struct btrfs_disk_key *key)
2352 read_eb_member(eb, h, struct btrfs_free_space_header, location, key);
2355 static inline void btrfs_set_free_space_key(struct extent_buffer *eb,
2356 struct btrfs_free_space_header *h,
2357 struct btrfs_disk_key *key)
2359 write_eb_member(eb, h, struct btrfs_free_space_header, location, key);
2362 /* struct btrfs_disk_key */
2363 BTRFS_SETGET_STACK_FUNCS(disk_key_objectid, struct btrfs_disk_key,
2365 BTRFS_SETGET_STACK_FUNCS(disk_key_offset, struct btrfs_disk_key, offset, 64);
2366 BTRFS_SETGET_STACK_FUNCS(disk_key_type, struct btrfs_disk_key, type, 8);
2368 static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu,
2369 struct btrfs_disk_key *disk)
2371 cpu->offset = le64_to_cpu(disk->offset);
2372 cpu->type = disk->type;
2373 cpu->objectid = le64_to_cpu(disk->objectid);
2376 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk,
2377 struct btrfs_key *cpu)
2379 disk->offset = cpu_to_le64(cpu->offset);
2380 disk->type = cpu->type;
2381 disk->objectid = cpu_to_le64(cpu->objectid);
2384 static inline void btrfs_node_key_to_cpu(struct extent_buffer *eb,
2385 struct btrfs_key *key, int nr)
2387 struct btrfs_disk_key disk_key;
2388 btrfs_node_key(eb, &disk_key, nr);
2389 btrfs_disk_key_to_cpu(key, &disk_key);
2392 static inline void btrfs_item_key_to_cpu(struct extent_buffer *eb,
2393 struct btrfs_key *key, int nr)
2395 struct btrfs_disk_key disk_key;
2396 btrfs_item_key(eb, &disk_key, nr);
2397 btrfs_disk_key_to_cpu(key, &disk_key);
2400 static inline void btrfs_dir_item_key_to_cpu(struct extent_buffer *eb,
2401 struct btrfs_dir_item *item,
2402 struct btrfs_key *key)
2404 struct btrfs_disk_key disk_key;
2405 btrfs_dir_item_key(eb, item, &disk_key);
2406 btrfs_disk_key_to_cpu(key, &disk_key);
2410 static inline u8 btrfs_key_type(struct btrfs_key *key)
2415 static inline void btrfs_set_key_type(struct btrfs_key *key, u8 val)
2420 /* struct btrfs_header */
2421 BTRFS_SETGET_HEADER_FUNCS(header_bytenr, struct btrfs_header, bytenr, 64);
2422 BTRFS_SETGET_HEADER_FUNCS(header_generation, struct btrfs_header,
2424 BTRFS_SETGET_HEADER_FUNCS(header_owner, struct btrfs_header, owner, 64);
2425 BTRFS_SETGET_HEADER_FUNCS(header_nritems, struct btrfs_header, nritems, 32);
2426 BTRFS_SETGET_HEADER_FUNCS(header_flags, struct btrfs_header, flags, 64);
2427 BTRFS_SETGET_HEADER_FUNCS(header_level, struct btrfs_header, level, 8);
2429 static inline int btrfs_header_flag(struct extent_buffer *eb, u64 flag)
2431 return (btrfs_header_flags(eb) & flag) == flag;
2434 static inline int btrfs_set_header_flag(struct extent_buffer *eb, u64 flag)
2436 u64 flags = btrfs_header_flags(eb);
2437 btrfs_set_header_flags(eb, flags | flag);
2438 return (flags & flag) == flag;
2441 static inline int btrfs_clear_header_flag(struct extent_buffer *eb, u64 flag)
2443 u64 flags = btrfs_header_flags(eb);
2444 btrfs_set_header_flags(eb, flags & ~flag);
2445 return (flags & flag) == flag;
2448 static inline int btrfs_header_backref_rev(struct extent_buffer *eb)
2450 u64 flags = btrfs_header_flags(eb);
2451 return flags >> BTRFS_BACKREF_REV_SHIFT;
2454 static inline void btrfs_set_header_backref_rev(struct extent_buffer *eb,
2457 u64 flags = btrfs_header_flags(eb);
2458 flags &= ~BTRFS_BACKREF_REV_MASK;
2459 flags |= (u64)rev << BTRFS_BACKREF_REV_SHIFT;
2460 btrfs_set_header_flags(eb, flags);
2463 static inline u8 *btrfs_header_fsid(struct extent_buffer *eb)
2465 unsigned long ptr = offsetof(struct btrfs_header, fsid);
2469 static inline u8 *btrfs_header_chunk_tree_uuid(struct extent_buffer *eb)
2471 unsigned long ptr = offsetof(struct btrfs_header, chunk_tree_uuid);
2475 static inline int btrfs_is_leaf(struct extent_buffer *eb)
2477 return btrfs_header_level(eb) == 0;
2480 /* struct btrfs_root_item */
2481 BTRFS_SETGET_FUNCS(disk_root_generation, struct btrfs_root_item,
2483 BTRFS_SETGET_FUNCS(disk_root_refs, struct btrfs_root_item, refs, 32);
2484 BTRFS_SETGET_FUNCS(disk_root_bytenr, struct btrfs_root_item, bytenr, 64);
2485 BTRFS_SETGET_FUNCS(disk_root_level, struct btrfs_root_item, level, 8);
2487 BTRFS_SETGET_STACK_FUNCS(root_generation, struct btrfs_root_item,
2489 BTRFS_SETGET_STACK_FUNCS(root_bytenr, struct btrfs_root_item, bytenr, 64);
2490 BTRFS_SETGET_STACK_FUNCS(root_level, struct btrfs_root_item, level, 8);
2491 BTRFS_SETGET_STACK_FUNCS(root_dirid, struct btrfs_root_item, root_dirid, 64);
2492 BTRFS_SETGET_STACK_FUNCS(root_refs, struct btrfs_root_item, refs, 32);
2493 BTRFS_SETGET_STACK_FUNCS(root_flags, struct btrfs_root_item, flags, 64);
2494 BTRFS_SETGET_STACK_FUNCS(root_used, struct btrfs_root_item, bytes_used, 64);
2495 BTRFS_SETGET_STACK_FUNCS(root_limit, struct btrfs_root_item, byte_limit, 64);
2496 BTRFS_SETGET_STACK_FUNCS(root_last_snapshot, struct btrfs_root_item,
2498 BTRFS_SETGET_STACK_FUNCS(root_generation_v2, struct btrfs_root_item,
2500 BTRFS_SETGET_STACK_FUNCS(root_ctransid, struct btrfs_root_item,
2502 BTRFS_SETGET_STACK_FUNCS(root_otransid, struct btrfs_root_item,
2504 BTRFS_SETGET_STACK_FUNCS(root_stransid, struct btrfs_root_item,
2506 BTRFS_SETGET_STACK_FUNCS(root_rtransid, struct btrfs_root_item,
2509 static inline bool btrfs_root_readonly(struct btrfs_root *root)
2511 return (root->root_item.flags & cpu_to_le64(BTRFS_ROOT_SUBVOL_RDONLY)) != 0;
2514 /* struct btrfs_root_backup */
2515 BTRFS_SETGET_STACK_FUNCS(backup_tree_root, struct btrfs_root_backup,
2517 BTRFS_SETGET_STACK_FUNCS(backup_tree_root_gen, struct btrfs_root_backup,
2519 BTRFS_SETGET_STACK_FUNCS(backup_tree_root_level, struct btrfs_root_backup,
2520 tree_root_level, 8);
2522 BTRFS_SETGET_STACK_FUNCS(backup_chunk_root, struct btrfs_root_backup,
2524 BTRFS_SETGET_STACK_FUNCS(backup_chunk_root_gen, struct btrfs_root_backup,
2525 chunk_root_gen, 64);
2526 BTRFS_SETGET_STACK_FUNCS(backup_chunk_root_level, struct btrfs_root_backup,
2527 chunk_root_level, 8);
2529 BTRFS_SETGET_STACK_FUNCS(backup_extent_root, struct btrfs_root_backup,
2531 BTRFS_SETGET_STACK_FUNCS(backup_extent_root_gen, struct btrfs_root_backup,
2532 extent_root_gen, 64);
2533 BTRFS_SETGET_STACK_FUNCS(backup_extent_root_level, struct btrfs_root_backup,
2534 extent_root_level, 8);
2536 BTRFS_SETGET_STACK_FUNCS(backup_fs_root, struct btrfs_root_backup,
2538 BTRFS_SETGET_STACK_FUNCS(backup_fs_root_gen, struct btrfs_root_backup,
2540 BTRFS_SETGET_STACK_FUNCS(backup_fs_root_level, struct btrfs_root_backup,
2543 BTRFS_SETGET_STACK_FUNCS(backup_dev_root, struct btrfs_root_backup,
2545 BTRFS_SETGET_STACK_FUNCS(backup_dev_root_gen, struct btrfs_root_backup,
2547 BTRFS_SETGET_STACK_FUNCS(backup_dev_root_level, struct btrfs_root_backup,
2550 BTRFS_SETGET_STACK_FUNCS(backup_csum_root, struct btrfs_root_backup,
2552 BTRFS_SETGET_STACK_FUNCS(backup_csum_root_gen, struct btrfs_root_backup,
2554 BTRFS_SETGET_STACK_FUNCS(backup_csum_root_level, struct btrfs_root_backup,
2555 csum_root_level, 8);
2556 BTRFS_SETGET_STACK_FUNCS(backup_total_bytes, struct btrfs_root_backup,
2558 BTRFS_SETGET_STACK_FUNCS(backup_bytes_used, struct btrfs_root_backup,
2560 BTRFS_SETGET_STACK_FUNCS(backup_num_devices, struct btrfs_root_backup,
2563 /* struct btrfs_balance_item */
2564 BTRFS_SETGET_FUNCS(balance_flags, struct btrfs_balance_item, flags, 64);
2566 static inline void btrfs_balance_data(struct extent_buffer *eb,
2567 struct btrfs_balance_item *bi,
2568 struct btrfs_disk_balance_args *ba)
2570 read_eb_member(eb, bi, struct btrfs_balance_item, data, ba);
2573 static inline void btrfs_set_balance_data(struct extent_buffer *eb,
2574 struct btrfs_balance_item *bi,
2575 struct btrfs_disk_balance_args *ba)
2577 write_eb_member(eb, bi, struct btrfs_balance_item, data, ba);
2580 static inline void btrfs_balance_meta(struct extent_buffer *eb,
2581 struct btrfs_balance_item *bi,
2582 struct btrfs_disk_balance_args *ba)
2584 read_eb_member(eb, bi, struct btrfs_balance_item, meta, ba);
2587 static inline void btrfs_set_balance_meta(struct extent_buffer *eb,
2588 struct btrfs_balance_item *bi,
2589 struct btrfs_disk_balance_args *ba)
2591 write_eb_member(eb, bi, struct btrfs_balance_item, meta, ba);
2594 static inline void btrfs_balance_sys(struct extent_buffer *eb,
2595 struct btrfs_balance_item *bi,
2596 struct btrfs_disk_balance_args *ba)
2598 read_eb_member(eb, bi, struct btrfs_balance_item, sys, ba);
2601 static inline void btrfs_set_balance_sys(struct extent_buffer *eb,
2602 struct btrfs_balance_item *bi,
2603 struct btrfs_disk_balance_args *ba)
2605 write_eb_member(eb, bi, struct btrfs_balance_item, sys, ba);
2609 btrfs_disk_balance_args_to_cpu(struct btrfs_balance_args *cpu,
2610 struct btrfs_disk_balance_args *disk)
2612 memset(cpu, 0, sizeof(*cpu));
2614 cpu->profiles = le64_to_cpu(disk->profiles);
2615 cpu->usage = le64_to_cpu(disk->usage);
2616 cpu->devid = le64_to_cpu(disk->devid);
2617 cpu->pstart = le64_to_cpu(disk->pstart);
2618 cpu->pend = le64_to_cpu(disk->pend);
2619 cpu->vstart = le64_to_cpu(disk->vstart);
2620 cpu->vend = le64_to_cpu(disk->vend);
2621 cpu->target = le64_to_cpu(disk->target);
2622 cpu->flags = le64_to_cpu(disk->flags);
2626 btrfs_cpu_balance_args_to_disk(struct btrfs_disk_balance_args *disk,
2627 struct btrfs_balance_args *cpu)
2629 memset(disk, 0, sizeof(*disk));
2631 disk->profiles = cpu_to_le64(cpu->profiles);
2632 disk->usage = cpu_to_le64(cpu->usage);
2633 disk->devid = cpu_to_le64(cpu->devid);
2634 disk->pstart = cpu_to_le64(cpu->pstart);
2635 disk->pend = cpu_to_le64(cpu->pend);
2636 disk->vstart = cpu_to_le64(cpu->vstart);
2637 disk->vend = cpu_to_le64(cpu->vend);
2638 disk->target = cpu_to_le64(cpu->target);
2639 disk->flags = cpu_to_le64(cpu->flags);
2642 /* struct btrfs_super_block */
2643 BTRFS_SETGET_STACK_FUNCS(super_bytenr, struct btrfs_super_block, bytenr, 64);
2644 BTRFS_SETGET_STACK_FUNCS(super_flags, struct btrfs_super_block, flags, 64);
2645 BTRFS_SETGET_STACK_FUNCS(super_generation, struct btrfs_super_block,
2647 BTRFS_SETGET_STACK_FUNCS(super_root, struct btrfs_super_block, root, 64);
2648 BTRFS_SETGET_STACK_FUNCS(super_sys_array_size,
2649 struct btrfs_super_block, sys_chunk_array_size, 32);
2650 BTRFS_SETGET_STACK_FUNCS(super_chunk_root_generation,
2651 struct btrfs_super_block, chunk_root_generation, 64);
2652 BTRFS_SETGET_STACK_FUNCS(super_root_level, struct btrfs_super_block,
2654 BTRFS_SETGET_STACK_FUNCS(super_chunk_root, struct btrfs_super_block,
2656 BTRFS_SETGET_STACK_FUNCS(super_chunk_root_level, struct btrfs_super_block,
2657 chunk_root_level, 8);
2658 BTRFS_SETGET_STACK_FUNCS(super_log_root, struct btrfs_super_block,
2660 BTRFS_SETGET_STACK_FUNCS(super_log_root_transid, struct btrfs_super_block,
2661 log_root_transid, 64);
2662 BTRFS_SETGET_STACK_FUNCS(super_log_root_level, struct btrfs_super_block,
2664 BTRFS_SETGET_STACK_FUNCS(super_total_bytes, struct btrfs_super_block,
2666 BTRFS_SETGET_STACK_FUNCS(super_bytes_used, struct btrfs_super_block,
2668 BTRFS_SETGET_STACK_FUNCS(super_sectorsize, struct btrfs_super_block,
2670 BTRFS_SETGET_STACK_FUNCS(super_nodesize, struct btrfs_super_block,
2672 BTRFS_SETGET_STACK_FUNCS(super_leafsize, struct btrfs_super_block,
2674 BTRFS_SETGET_STACK_FUNCS(super_stripesize, struct btrfs_super_block,
2676 BTRFS_SETGET_STACK_FUNCS(super_root_dir, struct btrfs_super_block,
2677 root_dir_objectid, 64);
2678 BTRFS_SETGET_STACK_FUNCS(super_num_devices, struct btrfs_super_block,
2680 BTRFS_SETGET_STACK_FUNCS(super_compat_flags, struct btrfs_super_block,
2682 BTRFS_SETGET_STACK_FUNCS(super_compat_ro_flags, struct btrfs_super_block,
2683 compat_ro_flags, 64);
2684 BTRFS_SETGET_STACK_FUNCS(super_incompat_flags, struct btrfs_super_block,
2685 incompat_flags, 64);
2686 BTRFS_SETGET_STACK_FUNCS(super_csum_type, struct btrfs_super_block,
2688 BTRFS_SETGET_STACK_FUNCS(super_cache_generation, struct btrfs_super_block,
2689 cache_generation, 64);
2691 static inline int btrfs_super_csum_size(struct btrfs_super_block *s)
2693 int t = btrfs_super_csum_type(s);
2694 BUG_ON(t >= ARRAY_SIZE(btrfs_csum_sizes));
2695 return btrfs_csum_sizes[t];
2698 static inline unsigned long btrfs_leaf_data(struct extent_buffer *l)
2700 return offsetof(struct btrfs_leaf, items);
2703 /* struct btrfs_file_extent_item */
2704 BTRFS_SETGET_FUNCS(file_extent_type, struct btrfs_file_extent_item, type, 8);
2706 static inline unsigned long
2707 btrfs_file_extent_inline_start(struct btrfs_file_extent_item *e)
2709 unsigned long offset = (unsigned long)e;
2710 offset += offsetof(struct btrfs_file_extent_item, disk_bytenr);
2714 static inline u32 btrfs_file_extent_calc_inline_size(u32 datasize)
2716 return offsetof(struct btrfs_file_extent_item, disk_bytenr) + datasize;
2719 BTRFS_SETGET_FUNCS(file_extent_disk_bytenr, struct btrfs_file_extent_item,
2721 BTRFS_SETGET_FUNCS(file_extent_generation, struct btrfs_file_extent_item,
2723 BTRFS_SETGET_FUNCS(file_extent_disk_num_bytes, struct btrfs_file_extent_item,
2724 disk_num_bytes, 64);
2725 BTRFS_SETGET_FUNCS(file_extent_offset, struct btrfs_file_extent_item,
2727 BTRFS_SETGET_FUNCS(file_extent_num_bytes, struct btrfs_file_extent_item,
2729 BTRFS_SETGET_FUNCS(file_extent_ram_bytes, struct btrfs_file_extent_item,
2731 BTRFS_SETGET_FUNCS(file_extent_compression, struct btrfs_file_extent_item,
2733 BTRFS_SETGET_FUNCS(file_extent_encryption, struct btrfs_file_extent_item,
2735 BTRFS_SETGET_FUNCS(file_extent_other_encoding, struct btrfs_file_extent_item,
2736 other_encoding, 16);
2738 /* this returns the number of file bytes represented by the inline item.
2739 * If an item is compressed, this is the uncompressed size
2741 static inline u32 btrfs_file_extent_inline_len(struct extent_buffer *eb,
2742 struct btrfs_file_extent_item *e)
2744 return btrfs_file_extent_ram_bytes(eb, e);
2748 * this returns the number of bytes used by the item on disk, minus the
2749 * size of any extent headers. If a file is compressed on disk, this is
2750 * the compressed size
2752 static inline u32 btrfs_file_extent_inline_item_len(struct extent_buffer *eb,
2753 struct btrfs_item *e)
2755 unsigned long offset;
2756 offset = offsetof(struct btrfs_file_extent_item, disk_bytenr);
2757 return btrfs_item_size(eb, e) - offset;
2760 /* btrfs_dev_stats_item */
2761 static inline u64 btrfs_dev_stats_value(struct extent_buffer *eb,
2762 struct btrfs_dev_stats_item *ptr,
2767 read_extent_buffer(eb, &val,
2768 offsetof(struct btrfs_dev_stats_item, values) +
2769 ((unsigned long)ptr) + (index * sizeof(u64)),
2774 static inline void btrfs_set_dev_stats_value(struct extent_buffer *eb,
2775 struct btrfs_dev_stats_item *ptr,
2778 write_extent_buffer(eb, &val,
2779 offsetof(struct btrfs_dev_stats_item, values) +
2780 ((unsigned long)ptr) + (index * sizeof(u64)),
2784 /* btrfs_qgroup_status_item */
2785 BTRFS_SETGET_FUNCS(qgroup_status_generation, struct btrfs_qgroup_status_item,
2787 BTRFS_SETGET_FUNCS(qgroup_status_version, struct btrfs_qgroup_status_item,
2789 BTRFS_SETGET_FUNCS(qgroup_status_flags, struct btrfs_qgroup_status_item,
2791 BTRFS_SETGET_FUNCS(qgroup_status_scan, struct btrfs_qgroup_status_item,
2794 /* btrfs_qgroup_info_item */
2795 BTRFS_SETGET_FUNCS(qgroup_info_generation, struct btrfs_qgroup_info_item,
2797 BTRFS_SETGET_FUNCS(qgroup_info_rfer, struct btrfs_qgroup_info_item, rfer, 64);
2798 BTRFS_SETGET_FUNCS(qgroup_info_rfer_cmpr, struct btrfs_qgroup_info_item,
2800 BTRFS_SETGET_FUNCS(qgroup_info_excl, struct btrfs_qgroup_info_item, excl, 64);
2801 BTRFS_SETGET_FUNCS(qgroup_info_excl_cmpr, struct btrfs_qgroup_info_item,
2804 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_generation,
2805 struct btrfs_qgroup_info_item, generation, 64);
2806 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_rfer, struct btrfs_qgroup_info_item,
2808 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_rfer_cmpr,
2809 struct btrfs_qgroup_info_item, rfer_cmpr, 64);
2810 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_excl, struct btrfs_qgroup_info_item,
2812 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_excl_cmpr,
2813 struct btrfs_qgroup_info_item, excl_cmpr, 64);
2815 /* btrfs_qgroup_limit_item */
2816 BTRFS_SETGET_FUNCS(qgroup_limit_flags, struct btrfs_qgroup_limit_item,
2818 BTRFS_SETGET_FUNCS(qgroup_limit_max_rfer, struct btrfs_qgroup_limit_item,
2820 BTRFS_SETGET_FUNCS(qgroup_limit_max_excl, struct btrfs_qgroup_limit_item,
2822 BTRFS_SETGET_FUNCS(qgroup_limit_rsv_rfer, struct btrfs_qgroup_limit_item,
2824 BTRFS_SETGET_FUNCS(qgroup_limit_rsv_excl, struct btrfs_qgroup_limit_item,
2827 /* btrfs_dev_replace_item */
2828 BTRFS_SETGET_FUNCS(dev_replace_src_devid,
2829 struct btrfs_dev_replace_item, src_devid, 64);
2830 BTRFS_SETGET_FUNCS(dev_replace_cont_reading_from_srcdev_mode,
2831 struct btrfs_dev_replace_item, cont_reading_from_srcdev_mode,
2833 BTRFS_SETGET_FUNCS(dev_replace_replace_state, struct btrfs_dev_replace_item,
2835 BTRFS_SETGET_FUNCS(dev_replace_time_started, struct btrfs_dev_replace_item,
2837 BTRFS_SETGET_FUNCS(dev_replace_time_stopped, struct btrfs_dev_replace_item,
2839 BTRFS_SETGET_FUNCS(dev_replace_num_write_errors, struct btrfs_dev_replace_item,
2840 num_write_errors, 64);
2841 BTRFS_SETGET_FUNCS(dev_replace_num_uncorrectable_read_errors,
2842 struct btrfs_dev_replace_item, num_uncorrectable_read_errors,
2844 BTRFS_SETGET_FUNCS(dev_replace_cursor_left, struct btrfs_dev_replace_item,
2846 BTRFS_SETGET_FUNCS(dev_replace_cursor_right, struct btrfs_dev_replace_item,
2849 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_src_devid,
2850 struct btrfs_dev_replace_item, src_devid, 64);
2851 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_cont_reading_from_srcdev_mode,
2852 struct btrfs_dev_replace_item,
2853 cont_reading_from_srcdev_mode, 64);
2854 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_replace_state,
2855 struct btrfs_dev_replace_item, replace_state, 64);
2856 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_time_started,
2857 struct btrfs_dev_replace_item, time_started, 64);
2858 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_time_stopped,
2859 struct btrfs_dev_replace_item, time_stopped, 64);
2860 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_num_write_errors,
2861 struct btrfs_dev_replace_item, num_write_errors, 64);
2862 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_num_uncorrectable_read_errors,
2863 struct btrfs_dev_replace_item,
2864 num_uncorrectable_read_errors, 64);
2865 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_cursor_left,
2866 struct btrfs_dev_replace_item, cursor_left, 64);
2867 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_cursor_right,
2868 struct btrfs_dev_replace_item, cursor_right, 64);
2870 static inline struct btrfs_fs_info *btrfs_sb(struct super_block *sb)
2872 return sb->s_fs_info;
2875 static inline u32 btrfs_level_size(struct btrfs_root *root, int level)
2878 return root->leafsize;
2879 return root->nodesize;
2882 /* helper function to cast into the data area of the leaf. */
2883 #define btrfs_item_ptr(leaf, slot, type) \
2884 ((type *)(btrfs_leaf_data(leaf) + \
2885 btrfs_item_offset_nr(leaf, slot)))
2887 #define btrfs_item_ptr_offset(leaf, slot) \
2888 ((unsigned long)(btrfs_leaf_data(leaf) + \
2889 btrfs_item_offset_nr(leaf, slot)))
2891 static inline struct dentry *fdentry(struct file *file)
2893 return file->f_path.dentry;
2896 static inline bool btrfs_mixed_space_info(struct btrfs_space_info *space_info)
2898 return ((space_info->flags & BTRFS_BLOCK_GROUP_METADATA) &&
2899 (space_info->flags & BTRFS_BLOCK_GROUP_DATA));
2902 static inline gfp_t btrfs_alloc_write_mask(struct address_space *mapping)
2904 return mapping_gfp_mask(mapping) & ~__GFP_FS;
2908 static inline u64 btrfs_calc_trans_metadata_size(struct btrfs_root *root,
2911 return (root->leafsize + root->nodesize * (BTRFS_MAX_LEVEL - 1)) *
2916 * Doing a truncate won't result in new nodes or leaves, just what we need for
2919 static inline u64 btrfs_calc_trunc_metadata_size(struct btrfs_root *root,
2922 return (root->leafsize + root->nodesize * (BTRFS_MAX_LEVEL - 1)) *
2926 void btrfs_put_block_group(struct btrfs_block_group_cache *cache);
2927 int btrfs_run_delayed_refs(struct btrfs_trans_handle *trans,
2928 struct btrfs_root *root, unsigned long count);
2929 int btrfs_lookup_extent(struct btrfs_root *root, u64 start, u64 len);
2930 int btrfs_lookup_extent_info(struct btrfs_trans_handle *trans,
2931 struct btrfs_root *root, u64 bytenr,
2932 u64 num_bytes, u64 *refs, u64 *flags);
2933 int btrfs_pin_extent(struct btrfs_root *root,
2934 u64 bytenr, u64 num, int reserved);
2935 int btrfs_pin_extent_for_log_replay(struct btrfs_trans_handle *trans,
2936 struct btrfs_root *root,
2937 u64 bytenr, u64 num_bytes);
2938 int btrfs_cross_ref_exist(struct btrfs_trans_handle *trans,
2939 struct btrfs_root *root,
2940 u64 objectid, u64 offset, u64 bytenr);
2941 struct btrfs_block_group_cache *btrfs_lookup_block_group(
2942 struct btrfs_fs_info *info,
2944 void btrfs_put_block_group(struct btrfs_block_group_cache *cache);
2945 u64 btrfs_find_block_group(struct btrfs_root *root,
2946 u64 search_start, u64 search_hint, int owner);
2947 struct extent_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
2948 struct btrfs_root *root, u32 blocksize,
2949 u64 parent, u64 root_objectid,
2950 struct btrfs_disk_key *key, int level,
2951 u64 hint, u64 empty_size);
2952 void btrfs_free_tree_block(struct btrfs_trans_handle *trans,
2953 struct btrfs_root *root,
2954 struct extent_buffer *buf,
2955 u64 parent, int last_ref);
2956 struct extent_buffer *btrfs_init_new_buffer(struct btrfs_trans_handle *trans,
2957 struct btrfs_root *root,
2958 u64 bytenr, u32 blocksize,
2960 int btrfs_alloc_reserved_file_extent(struct btrfs_trans_handle *trans,
2961 struct btrfs_root *root,
2962 u64 root_objectid, u64 owner,
2963 u64 offset, struct btrfs_key *ins);
2964 int btrfs_alloc_logged_file_extent(struct btrfs_trans_handle *trans,
2965 struct btrfs_root *root,
2966 u64 root_objectid, u64 owner, u64 offset,
2967 struct btrfs_key *ins);
2968 int btrfs_reserve_extent(struct btrfs_trans_handle *trans,
2969 struct btrfs_root *root,
2970 u64 num_bytes, u64 min_alloc_size,
2971 u64 empty_size, u64 hint_byte,
2972 struct btrfs_key *ins, u64 data);
2973 int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2974 struct extent_buffer *buf, int full_backref, int for_cow);
2975 int btrfs_dec_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2976 struct extent_buffer *buf, int full_backref, int for_cow);
2977 int btrfs_set_disk_extent_flags(struct btrfs_trans_handle *trans,
2978 struct btrfs_root *root,
2979 u64 bytenr, u64 num_bytes, u64 flags,
2981 int btrfs_free_extent(struct btrfs_trans_handle *trans,
2982 struct btrfs_root *root,
2983 u64 bytenr, u64 num_bytes, u64 parent, u64 root_objectid,
2984 u64 owner, u64 offset, int for_cow);
2986 int btrfs_free_reserved_extent(struct btrfs_root *root, u64 start, u64 len);
2987 int btrfs_free_and_pin_reserved_extent(struct btrfs_root *root,
2988 u64 start, u64 len);
2989 void btrfs_prepare_extent_commit(struct btrfs_trans_handle *trans,
2990 struct btrfs_root *root);
2991 int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans,
2992 struct btrfs_root *root);
2993 int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
2994 struct btrfs_root *root,
2995 u64 bytenr, u64 num_bytes, u64 parent,
2996 u64 root_objectid, u64 owner, u64 offset, int for_cow);
2998 int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans,
2999 struct btrfs_root *root);
3000 int btrfs_extent_readonly(struct btrfs_root *root, u64 bytenr);
3001 int btrfs_free_block_groups(struct btrfs_fs_info *info);
3002 int btrfs_read_block_groups(struct btrfs_root *root);
3003 int btrfs_can_relocate(struct btrfs_root *root, u64 bytenr);
3004 int btrfs_make_block_group(struct btrfs_trans_handle *trans,
3005 struct btrfs_root *root, u64 bytes_used,
3006 u64 type, u64 chunk_objectid, u64 chunk_offset,
3008 int btrfs_remove_block_group(struct btrfs_trans_handle *trans,
3009 struct btrfs_root *root, u64 group_start);
3010 void btrfs_create_pending_block_groups(struct btrfs_trans_handle *trans,
3011 struct btrfs_root *root);
3012 u64 btrfs_reduce_alloc_profile(struct btrfs_root *root, u64 flags);
3013 u64 btrfs_get_alloc_profile(struct btrfs_root *root, int data);
3014 void btrfs_clear_space_info_full(struct btrfs_fs_info *info);
3016 enum btrfs_reserve_flush_enum {
3017 /* If we are in the transaction, we can't flush anything.*/
3018 BTRFS_RESERVE_NO_FLUSH,
3020 * Flushing delalloc may cause deadlock somewhere, in this
3021 * case, use FLUSH LIMIT
3023 BTRFS_RESERVE_FLUSH_LIMIT,
3024 BTRFS_RESERVE_FLUSH_ALL,
3027 int btrfs_check_data_free_space(struct inode *inode, u64 bytes);
3028 void btrfs_free_reserved_data_space(struct inode *inode, u64 bytes);
3029 void btrfs_trans_release_metadata(struct btrfs_trans_handle *trans,
3030 struct btrfs_root *root);
3031 int btrfs_orphan_reserve_metadata(struct btrfs_trans_handle *trans,
3032 struct inode *inode);
3033 void btrfs_orphan_release_metadata(struct inode *inode);
3034 int btrfs_snap_reserve_metadata(struct btrfs_trans_handle *trans,
3035 struct btrfs_pending_snapshot *pending);
3036 int btrfs_delalloc_reserve_metadata(struct inode *inode, u64 num_bytes);
3037 void btrfs_delalloc_release_metadata(struct inode *inode, u64 num_bytes);
3038 int btrfs_delalloc_reserve_space(struct inode *inode, u64 num_bytes);
3039 void btrfs_delalloc_release_space(struct inode *inode, u64 num_bytes);
3040 void btrfs_init_block_rsv(struct btrfs_block_rsv *rsv, unsigned short type);
3041 struct btrfs_block_rsv *btrfs_alloc_block_rsv(struct btrfs_root *root,
3042 unsigned short type);
3043 void btrfs_free_block_rsv(struct btrfs_root *root,
3044 struct btrfs_block_rsv *rsv);
3045 int btrfs_block_rsv_add(struct btrfs_root *root,
3046 struct btrfs_block_rsv *block_rsv, u64 num_bytes,
3047 enum btrfs_reserve_flush_enum flush);
3048 int btrfs_block_rsv_check(struct btrfs_root *root,
3049 struct btrfs_block_rsv *block_rsv, int min_factor);
3050 int btrfs_block_rsv_refill(struct btrfs_root *root,
3051 struct btrfs_block_rsv *block_rsv, u64 min_reserved,
3052 enum btrfs_reserve_flush_enum flush);
3053 int btrfs_block_rsv_migrate(struct btrfs_block_rsv *src_rsv,
3054 struct btrfs_block_rsv *dst_rsv,
3056 void btrfs_block_rsv_release(struct btrfs_root *root,
3057 struct btrfs_block_rsv *block_rsv,
3059 int btrfs_set_block_group_ro(struct btrfs_root *root,
3060 struct btrfs_block_group_cache *cache);
3061 void btrfs_set_block_group_rw(struct btrfs_root *root,
3062 struct btrfs_block_group_cache *cache);
3063 void btrfs_put_block_group_cache(struct btrfs_fs_info *info);
3064 u64 btrfs_account_ro_block_groups_free_space(struct btrfs_space_info *sinfo);
3065 int btrfs_error_unpin_extent_range(struct btrfs_root *root,
3066 u64 start, u64 end);
3067 int btrfs_error_discard_extent(struct btrfs_root *root, u64 bytenr,
3068 u64 num_bytes, u64 *actual_bytes);
3069 int btrfs_force_chunk_alloc(struct btrfs_trans_handle *trans,
3070 struct btrfs_root *root, u64 type);
3071 int btrfs_trim_fs(struct btrfs_root *root, struct fstrim_range *range);
3073 int btrfs_init_space_info(struct btrfs_fs_info *fs_info);
3074 int btrfs_delayed_refs_qgroup_accounting(struct btrfs_trans_handle *trans,
3075 struct btrfs_fs_info *fs_info);
3077 int btrfs_bin_search(struct extent_buffer *eb, struct btrfs_key *key,
3078 int level, int *slot);
3079 int btrfs_comp_cpu_keys(struct btrfs_key *k1, struct btrfs_key *k2);
3080 int btrfs_previous_item(struct btrfs_root *root,
3081 struct btrfs_path *path, u64 min_objectid,
3083 void btrfs_set_item_key_safe(struct btrfs_trans_handle *trans,
3084 struct btrfs_root *root, struct btrfs_path *path,
3085 struct btrfs_key *new_key);
3086 struct extent_buffer *btrfs_root_node(struct btrfs_root *root);
3087 struct extent_buffer *btrfs_lock_root_node(struct btrfs_root *root);
3088 int btrfs_find_next_key(struct btrfs_root *root, struct btrfs_path *path,
3089 struct btrfs_key *key, int lowest_level,
3090 int cache_only, u64 min_trans);
3091 int btrfs_search_forward(struct btrfs_root *root, struct btrfs_key *min_key,
3092 struct btrfs_key *max_key,
3093 struct btrfs_path *path, int cache_only,
3095 enum btrfs_compare_tree_result {
3096 BTRFS_COMPARE_TREE_NEW,
3097 BTRFS_COMPARE_TREE_DELETED,
3098 BTRFS_COMPARE_TREE_CHANGED,
3100 typedef int (*btrfs_changed_cb_t)(struct btrfs_root *left_root,
3101 struct btrfs_root *right_root,
3102 struct btrfs_path *left_path,
3103 struct btrfs_path *right_path,
3104 struct btrfs_key *key,
3105 enum btrfs_compare_tree_result result,
3107 int btrfs_compare_trees(struct btrfs_root *left_root,
3108 struct btrfs_root *right_root,
3109 btrfs_changed_cb_t cb, void *ctx);
3110 int btrfs_cow_block(struct btrfs_trans_handle *trans,
3111 struct btrfs_root *root, struct extent_buffer *buf,
3112 struct extent_buffer *parent, int parent_slot,
3113 struct extent_buffer **cow_ret);
3114 int btrfs_copy_root(struct btrfs_trans_handle *trans,
3115 struct btrfs_root *root,
3116 struct extent_buffer *buf,
3117 struct extent_buffer **cow_ret, u64 new_root_objectid);
3118 int btrfs_block_can_be_shared(struct btrfs_root *root,
3119 struct extent_buffer *buf);
3120 void btrfs_extend_item(struct btrfs_trans_handle *trans,
3121 struct btrfs_root *root, struct btrfs_path *path,
3123 void btrfs_truncate_item(struct btrfs_trans_handle *trans,
3124 struct btrfs_root *root,
3125 struct btrfs_path *path,
3126 u32 new_size, int from_end);
3127 int btrfs_split_item(struct btrfs_trans_handle *trans,
3128 struct btrfs_root *root,
3129 struct btrfs_path *path,
3130 struct btrfs_key *new_key,
3131 unsigned long split_offset);
3132 int btrfs_duplicate_item(struct btrfs_trans_handle *trans,
3133 struct btrfs_root *root,
3134 struct btrfs_path *path,
3135 struct btrfs_key *new_key);
3136 int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root
3137 *root, struct btrfs_key *key, struct btrfs_path *p, int
3139 int btrfs_search_old_slot(struct btrfs_root *root, struct btrfs_key *key,
3140 struct btrfs_path *p, u64 time_seq);
3141 int btrfs_search_slot_for_read(struct btrfs_root *root,
3142 struct btrfs_key *key, struct btrfs_path *p,
3143 int find_higher, int return_any);
3144 int btrfs_realloc_node(struct btrfs_trans_handle *trans,
3145 struct btrfs_root *root, struct extent_buffer *parent,
3146 int start_slot, int cache_only, u64 *last_ret,
3147 struct btrfs_key *progress);
3148 void btrfs_release_path(struct btrfs_path *p);
3149 struct btrfs_path *btrfs_alloc_path(void);
3150 void btrfs_free_path(struct btrfs_path *p);
3151 void btrfs_set_path_blocking(struct btrfs_path *p);
3152 void btrfs_clear_path_blocking(struct btrfs_path *p,
3153 struct extent_buffer *held, int held_rw);
3154 void btrfs_unlock_up_safe(struct btrfs_path *p, int level);
3156 int btrfs_del_items(struct btrfs_trans_handle *trans, struct btrfs_root *root,
3157 struct btrfs_path *path, int slot, int nr);
3158 static inline int btrfs_del_item(struct btrfs_trans_handle *trans,
3159 struct btrfs_root *root,
3160 struct btrfs_path *path)
3162 return btrfs_del_items(trans, root, path, path->slots[0], 1);
3165 void setup_items_for_insert(struct btrfs_trans_handle *trans,
3166 struct btrfs_root *root, struct btrfs_path *path,
3167 struct btrfs_key *cpu_key, u32 *data_size,
3168 u32 total_data, u32 total_size, int nr);
3169 int btrfs_insert_item(struct btrfs_trans_handle *trans, struct btrfs_root
3170 *root, struct btrfs_key *key, void *data, u32 data_size);
3171 int btrfs_insert_empty_items(struct btrfs_trans_handle *trans,
3172 struct btrfs_root *root,
3173 struct btrfs_path *path,
3174 struct btrfs_key *cpu_key, u32 *data_size, int nr);
3176 static inline int btrfs_insert_empty_item(struct btrfs_trans_handle *trans,
3177 struct btrfs_root *root,
3178 struct btrfs_path *path,
3179 struct btrfs_key *key,
3182 return btrfs_insert_empty_items(trans, root, path, key, &data_size, 1);
3185 int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path);
3186 int btrfs_next_old_leaf(struct btrfs_root *root, struct btrfs_path *path,
3188 static inline int btrfs_next_old_item(struct btrfs_root *root,
3189 struct btrfs_path *p, u64 time_seq)
3192 if (p->slots[0] >= btrfs_header_nritems(p->nodes[0]))
3193 return btrfs_next_old_leaf(root, p, time_seq);
3196 static inline int btrfs_next_item(struct btrfs_root *root, struct btrfs_path *p)
3198 return btrfs_next_old_item(root, p, 0);
3200 int btrfs_prev_leaf(struct btrfs_root *root, struct btrfs_path *path);
3201 int btrfs_leaf_free_space(struct btrfs_root *root, struct extent_buffer *leaf);
3202 int __must_check btrfs_drop_snapshot(struct btrfs_root *root,
3203 struct btrfs_block_rsv *block_rsv,
3204 int update_ref, int for_reloc);
3205 int btrfs_drop_subtree(struct btrfs_trans_handle *trans,
3206 struct btrfs_root *root,
3207 struct extent_buffer *node,
3208 struct extent_buffer *parent);
3209 static inline int btrfs_fs_closing(struct btrfs_fs_info *fs_info)
3212 * Get synced with close_ctree()
3215 return fs_info->closing;
3217 static inline void free_fs_info(struct btrfs_fs_info *fs_info)
3219 kfree(fs_info->balance_ctl);
3220 kfree(fs_info->delayed_root);
3221 kfree(fs_info->extent_root);
3222 kfree(fs_info->tree_root);
3223 kfree(fs_info->chunk_root);
3224 kfree(fs_info->dev_root);
3225 kfree(fs_info->csum_root);
3226 kfree(fs_info->quota_root);
3227 kfree(fs_info->super_copy);
3228 kfree(fs_info->super_for_commit);
3232 /* tree mod log functions from ctree.c */
3233 u64 btrfs_get_tree_mod_seq(struct btrfs_fs_info *fs_info,
3234 struct seq_list *elem);
3235 void btrfs_put_tree_mod_seq(struct btrfs_fs_info *fs_info,
3236 struct seq_list *elem);
3237 static inline u64 btrfs_inc_tree_mod_seq(struct btrfs_fs_info *fs_info)
3239 return atomic_inc_return(&fs_info->tree_mod_seq);
3241 int btrfs_old_root_level(struct btrfs_root *root, u64 time_seq);
3244 int btrfs_find_root_ref(struct btrfs_root *tree_root,
3245 struct btrfs_path *path,
3246 u64 root_id, u64 ref_id);
3247 int btrfs_add_root_ref(struct btrfs_trans_handle *trans,
3248 struct btrfs_root *tree_root,
3249 u64 root_id, u64 ref_id, u64 dirid, u64 sequence,
3250 const char *name, int name_len);
3251 int btrfs_del_root_ref(struct btrfs_trans_handle *trans,
3252 struct btrfs_root *tree_root,
3253 u64 root_id, u64 ref_id, u64 dirid, u64 *sequence,
3254 const char *name, int name_len);
3255 int btrfs_del_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
3256 struct btrfs_key *key);
3257 int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root
3258 *root, struct btrfs_key *key, struct btrfs_root_item
3260 int __must_check btrfs_update_root(struct btrfs_trans_handle *trans,
3261 struct btrfs_root *root,
3262 struct btrfs_key *key,
3263 struct btrfs_root_item *item);
3264 void btrfs_read_root_item(struct btrfs_root *root,
3265 struct extent_buffer *eb, int slot,
3266 struct btrfs_root_item *item);
3267 int btrfs_find_last_root(struct btrfs_root *root, u64 objectid, struct
3268 btrfs_root_item *item, struct btrfs_key *key);
3269 int btrfs_find_dead_roots(struct btrfs_root *root, u64 objectid);
3270 int btrfs_find_orphan_roots(struct btrfs_root *tree_root);
3271 void btrfs_set_root_node(struct btrfs_root_item *item,
3272 struct extent_buffer *node);
3273 void btrfs_check_and_init_root_item(struct btrfs_root_item *item);
3274 void btrfs_update_root_times(struct btrfs_trans_handle *trans,
3275 struct btrfs_root *root);
3278 int btrfs_insert_dir_item(struct btrfs_trans_handle *trans,
3279 struct btrfs_root *root, const char *name,
3280 int name_len, struct inode *dir,
3281 struct btrfs_key *location, u8 type, u64 index);
3282 struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans,
3283 struct btrfs_root *root,
3284 struct btrfs_path *path, u64 dir,
3285 const char *name, int name_len,
3287 struct btrfs_dir_item *
3288 btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans,
3289 struct btrfs_root *root,
3290 struct btrfs_path *path, u64 dir,
3291 u64 objectid, const char *name, int name_len,
3293 struct btrfs_dir_item *
3294 btrfs_search_dir_index_item(struct btrfs_root *root,
3295 struct btrfs_path *path, u64 dirid,
3296 const char *name, int name_len);
3297 struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_root *root,
3298 struct btrfs_path *path,
3299 const char *name, int name_len);
3300 int btrfs_delete_one_dir_name(struct btrfs_trans_handle *trans,
3301 struct btrfs_root *root,
3302 struct btrfs_path *path,
3303 struct btrfs_dir_item *di);
3304 int btrfs_insert_xattr_item(struct btrfs_trans_handle *trans,
3305 struct btrfs_root *root,
3306 struct btrfs_path *path, u64 objectid,
3307 const char *name, u16 name_len,
3308 const void *data, u16 data_len);
3309 struct btrfs_dir_item *btrfs_lookup_xattr(struct btrfs_trans_handle *trans,
3310 struct btrfs_root *root,
3311 struct btrfs_path *path, u64 dir,
3312 const char *name, u16 name_len,
3314 int verify_dir_item(struct btrfs_root *root,
3315 struct extent_buffer *leaf,
3316 struct btrfs_dir_item *dir_item);
3319 int btrfs_insert_orphan_item(struct btrfs_trans_handle *trans,
3320 struct btrfs_root *root, u64 offset);
3321 int btrfs_del_orphan_item(struct btrfs_trans_handle *trans,
3322 struct btrfs_root *root, u64 offset);
3323 int btrfs_find_orphan_item(struct btrfs_root *root, u64 offset);
3326 int btrfs_insert_inode_ref(struct btrfs_trans_handle *trans,
3327 struct btrfs_root *root,
3328 const char *name, int name_len,
3329 u64 inode_objectid, u64 ref_objectid, u64 index);
3330 int btrfs_del_inode_ref(struct btrfs_trans_handle *trans,
3331 struct btrfs_root *root,
3332 const char *name, int name_len,
3333 u64 inode_objectid, u64 ref_objectid, u64 *index);
3334 int btrfs_get_inode_ref_index(struct btrfs_trans_handle *trans,
3335 struct btrfs_root *root,
3336 struct btrfs_path *path,
3337 const char *name, int name_len,
3338 u64 inode_objectid, u64 ref_objectid, int mod,
3340 int btrfs_insert_empty_inode(struct btrfs_trans_handle *trans,
3341 struct btrfs_root *root,
3342 struct btrfs_path *path, u64 objectid);
3343 int btrfs_lookup_inode(struct btrfs_trans_handle *trans, struct btrfs_root
3344 *root, struct btrfs_path *path,
3345 struct btrfs_key *location, int mod);
3347 struct btrfs_inode_extref *
3348 btrfs_lookup_inode_extref(struct btrfs_trans_handle *trans,
3349 struct btrfs_root *root,
3350 struct btrfs_path *path,
3351 const char *name, int name_len,
3352 u64 inode_objectid, u64 ref_objectid, int ins_len,
3355 int btrfs_find_name_in_ext_backref(struct btrfs_path *path,
3356 u64 ref_objectid, const char *name,
3358 struct btrfs_inode_extref **extref_ret);
3361 int btrfs_del_csums(struct btrfs_trans_handle *trans,
3362 struct btrfs_root *root, u64 bytenr, u64 len);
3363 int btrfs_lookup_bio_sums(struct btrfs_root *root, struct inode *inode,
3364 struct bio *bio, u32 *dst);
3365 int btrfs_lookup_bio_sums_dio(struct btrfs_root *root, struct inode *inode,
3366 struct bio *bio, u64 logical_offset);
3367 int btrfs_insert_file_extent(struct btrfs_trans_handle *trans,
3368 struct btrfs_root *root,
3369 u64 objectid, u64 pos,
3370 u64 disk_offset, u64 disk_num_bytes,
3371 u64 num_bytes, u64 offset, u64 ram_bytes,
3372 u8 compression, u8 encryption, u16 other_encoding);
3373 int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
3374 struct btrfs_root *root,
3375 struct btrfs_path *path, u64 objectid,
3376 u64 bytenr, int mod);
3377 u64 btrfs_file_extent_length(struct btrfs_path *path);
3378 int btrfs_csum_file_blocks(struct btrfs_trans_handle *trans,
3379 struct btrfs_root *root,
3380 struct btrfs_ordered_sum *sums);
3381 int btrfs_csum_one_bio(struct btrfs_root *root, struct inode *inode,
3382 struct bio *bio, u64 file_start, int contig);
3383 struct btrfs_csum_item *btrfs_lookup_csum(struct btrfs_trans_handle *trans,
3384 struct btrfs_root *root,
3385 struct btrfs_path *path,
3386 u64 bytenr, int cow);
3387 int btrfs_csum_truncate(struct btrfs_trans_handle *trans,
3388 struct btrfs_root *root, struct btrfs_path *path,
3390 int btrfs_lookup_csums_range(struct btrfs_root *root, u64 start, u64 end,
3391 struct list_head *list, int search_commit);
3393 struct btrfs_delalloc_work {
3394 struct inode *inode;
3397 struct completion completion;
3398 struct list_head list;
3399 struct btrfs_work work;
3402 struct btrfs_delalloc_work *btrfs_alloc_delalloc_work(struct inode *inode,
3403 int wait, int delay_iput);
3404 void btrfs_wait_and_free_delalloc_work(struct btrfs_delalloc_work *work);
3406 struct extent_map *btrfs_get_extent_fiemap(struct inode *inode, struct page *page,
3407 size_t pg_offset, u64 start, u64 len,
3410 /* RHEL and EL kernels have a patch that renames PG_checked to FsMisc */
3411 #if defined(ClearPageFsMisc) && !defined(ClearPageChecked)
3412 #define ClearPageChecked ClearPageFsMisc
3413 #define SetPageChecked SetPageFsMisc
3414 #define PageChecked PageFsMisc
3417 /* This forces readahead on a given range of bytes in an inode */
3418 static inline void btrfs_force_ra(struct address_space *mapping,
3419 struct file_ra_state *ra, struct file *file,
3420 pgoff_t offset, unsigned long req_size)
3422 page_cache_sync_readahead(mapping, ra, file, offset, req_size);
3425 struct inode *btrfs_lookup_dentry(struct inode *dir, struct dentry *dentry);
3426 int btrfs_set_inode_index(struct inode *dir, u64 *index);
3427 int btrfs_unlink_inode(struct btrfs_trans_handle *trans,
3428 struct btrfs_root *root,
3429 struct inode *dir, struct inode *inode,
3430 const char *name, int name_len);
3431 int btrfs_add_link(struct btrfs_trans_handle *trans,
3432 struct inode *parent_inode, struct inode *inode,
3433 const char *name, int name_len, int add_backref, u64 index);
3434 int btrfs_unlink_subvol(struct btrfs_trans_handle *trans,
3435 struct btrfs_root *root,
3436 struct inode *dir, u64 objectid,
3437 const char *name, int name_len);
3438 int btrfs_truncate_page(struct inode *inode, loff_t from, loff_t len,
3440 int btrfs_truncate_inode_items(struct btrfs_trans_handle *trans,
3441 struct btrfs_root *root,
3442 struct inode *inode, u64 new_size,
3445 int btrfs_start_delalloc_inodes(struct btrfs_root *root, int delay_iput);
3446 int btrfs_set_extent_delalloc(struct inode *inode, u64 start, u64 end,
3447 struct extent_state **cached_state);
3448 int btrfs_writepages(struct address_space *mapping,
3449 struct writeback_control *wbc);
3450 int btrfs_create_subvol_root(struct btrfs_trans_handle *trans,
3451 struct btrfs_root *new_root, u64 new_dirid);
3452 int btrfs_merge_bio_hook(struct page *page, unsigned long offset,
3453 size_t size, struct bio *bio, unsigned long bio_flags);
3455 int btrfs_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf);
3456 int btrfs_readpage(struct file *file, struct page *page);
3457 void btrfs_evict_inode(struct inode *inode);
3458 int btrfs_write_inode(struct inode *inode, struct writeback_control *wbc);
3459 int btrfs_dirty_inode(struct inode *inode);
3460 struct inode *btrfs_alloc_inode(struct super_block *sb);
3461 void btrfs_destroy_inode(struct inode *inode);
3462 int btrfs_drop_inode(struct inode *inode);
3463 int btrfs_init_cachep(void);
3464 void btrfs_destroy_cachep(void);
3465 long btrfs_ioctl_trans_end(struct file *file);
3466 struct inode *btrfs_iget(struct super_block *s, struct btrfs_key *location,
3467 struct btrfs_root *root, int *was_new);
3468 struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page,
3469 size_t pg_offset, u64 start, u64 end,
3471 int btrfs_update_inode(struct btrfs_trans_handle *trans,
3472 struct btrfs_root *root,
3473 struct inode *inode);
3474 int btrfs_update_inode_fallback(struct btrfs_trans_handle *trans,
3475 struct btrfs_root *root, struct inode *inode);
3476 int btrfs_orphan_add(struct btrfs_trans_handle *trans, struct inode *inode);
3477 int btrfs_orphan_del(struct btrfs_trans_handle *trans, struct inode *inode);
3478 int btrfs_orphan_cleanup(struct btrfs_root *root);
3479 void btrfs_orphan_commit_root(struct btrfs_trans_handle *trans,
3480 struct btrfs_root *root);
3481 int btrfs_cont_expand(struct inode *inode, loff_t oldsize, loff_t size);
3482 void btrfs_invalidate_inodes(struct btrfs_root *root);
3483 void btrfs_add_delayed_iput(struct inode *inode);
3484 void btrfs_run_delayed_iputs(struct btrfs_root *root);
3485 int btrfs_prealloc_file_range(struct inode *inode, int mode,
3486 u64 start, u64 num_bytes, u64 min_size,
3487 loff_t actual_len, u64 *alloc_hint);
3488 int btrfs_prealloc_file_range_trans(struct inode *inode,
3489 struct btrfs_trans_handle *trans, int mode,
3490 u64 start, u64 num_bytes, u64 min_size,
3491 loff_t actual_len, u64 *alloc_hint);
3492 extern const struct dentry_operations btrfs_dentry_operations;
3495 long btrfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
3496 void btrfs_update_iflags(struct inode *inode);
3497 void btrfs_inherit_iflags(struct inode *inode, struct inode *dir);
3498 int btrfs_defrag_file(struct inode *inode, struct file *file,
3499 struct btrfs_ioctl_defrag_range_args *range,
3500 u64 newer_than, unsigned long max_pages);
3501 void btrfs_get_block_group_info(struct list_head *groups_list,
3502 struct btrfs_ioctl_space_info *space);
3505 int btrfs_add_inode_defrag(struct btrfs_trans_handle *trans,
3506 struct inode *inode);
3507 int btrfs_run_defrag_inodes(struct btrfs_fs_info *fs_info);
3508 int btrfs_sync_file(struct file *file, loff_t start, loff_t end, int datasync);
3509 void btrfs_drop_extent_cache(struct inode *inode, u64 start, u64 end,
3511 int btrfs_replace_extent_cache(struct inode *inode, struct extent_map *replace,
3512 u64 start, u64 end, int skip_pinned,
3514 extern const struct file_operations btrfs_file_operations;
3515 int __btrfs_drop_extents(struct btrfs_trans_handle *trans,
3516 struct btrfs_root *root, struct inode *inode,
3517 struct btrfs_path *path, u64 start, u64 end,
3518 u64 *drop_end, int drop_cache);
3519 int btrfs_drop_extents(struct btrfs_trans_handle *trans,
3520 struct btrfs_root *root, struct inode *inode, u64 start,
3521 u64 end, int drop_cache);
3522 int btrfs_mark_extent_written(struct btrfs_trans_handle *trans,
3523 struct inode *inode, u64 start, u64 end);
3524 int btrfs_release_file(struct inode *inode, struct file *file);
3525 void btrfs_drop_pages(struct page **pages, size_t num_pages);
3526 int btrfs_dirty_pages(struct btrfs_root *root, struct inode *inode,
3527 struct page **pages, size_t num_pages,
3528 loff_t pos, size_t write_bytes,
3529 struct extent_state **cached);
3532 int btrfs_defrag_leaves(struct btrfs_trans_handle *trans,
3533 struct btrfs_root *root, int cache_only);
3536 int btrfs_init_sysfs(void);
3537 void btrfs_exit_sysfs(void);
3540 ssize_t btrfs_listxattr(struct dentry *dentry, char *buffer, size_t size);
3543 int btrfs_parse_options(struct btrfs_root *root, char *options);
3544 int btrfs_sync_fs(struct super_block *sb, int wait);
3546 #ifdef CONFIG_PRINTK
3548 void btrfs_printk(struct btrfs_fs_info *fs_info, const char *fmt, ...);
3550 static inline __printf(2, 3)
3551 void btrfs_printk(struct btrfs_fs_info *fs_info, const char *fmt, ...)
3557 void __btrfs_std_error(struct btrfs_fs_info *fs_info, const char *function,
3558 unsigned int line, int errno, const char *fmt, ...);
3561 void __btrfs_abort_transaction(struct btrfs_trans_handle *trans,
3562 struct btrfs_root *root, const char *function,
3563 unsigned int line, int errno);
3565 #define btrfs_set_fs_incompat(__fs_info, opt) \
3566 __btrfs_set_fs_incompat((__fs_info), BTRFS_FEATURE_INCOMPAT_##opt)
3568 static inline void __btrfs_set_fs_incompat(struct btrfs_fs_info *fs_info,
3571 struct btrfs_super_block *disk_super;
3574 disk_super = fs_info->super_copy;
3575 features = btrfs_super_incompat_flags(disk_super);
3576 if (!(features & flag)) {
3578 btrfs_set_super_incompat_flags(disk_super, features);
3583 * Call btrfs_abort_transaction as early as possible when an error condition is
3584 * detected, that way the exact line number is reported.
3587 #define btrfs_abort_transaction(trans, root, errno) \
3589 __btrfs_abort_transaction(trans, root, __func__, \
3593 #define btrfs_std_error(fs_info, errno) \
3596 __btrfs_std_error((fs_info), __func__, \
3597 __LINE__, (errno), NULL); \
3600 #define btrfs_error(fs_info, errno, fmt, args...) \
3602 __btrfs_std_error((fs_info), __func__, __LINE__, \
3603 (errno), fmt, ##args); \
3607 void __btrfs_panic(struct btrfs_fs_info *fs_info, const char *function,
3608 unsigned int line, int errno, const char *fmt, ...);
3610 #define btrfs_panic(fs_info, errno, fmt, args...) \
3612 struct btrfs_fs_info *_i = (fs_info); \
3613 __btrfs_panic(_i, __func__, __LINE__, errno, fmt, ##args); \
3614 BUG_ON(!(_i->mount_opt & BTRFS_MOUNT_PANIC_ON_FATAL_ERROR)); \
3618 #ifdef CONFIG_BTRFS_FS_POSIX_ACL
3619 struct posix_acl *btrfs_get_acl(struct inode *inode, int type);
3620 int btrfs_init_acl(struct btrfs_trans_handle *trans,
3621 struct inode *inode, struct inode *dir);
3622 int btrfs_acl_chmod(struct inode *inode);
3624 #define btrfs_get_acl NULL
3625 static inline int btrfs_init_acl(struct btrfs_trans_handle *trans,
3626 struct inode *inode, struct inode *dir)
3630 static inline int btrfs_acl_chmod(struct inode *inode)
3637 int btrfs_relocate_block_group(struct btrfs_root *root, u64 group_start);
3638 int btrfs_init_reloc_root(struct btrfs_trans_handle *trans,
3639 struct btrfs_root *root);
3640 int btrfs_update_reloc_root(struct btrfs_trans_handle *trans,
3641 struct btrfs_root *root);
3642 int btrfs_recover_relocation(struct btrfs_root *root);
3643 int btrfs_reloc_clone_csums(struct inode *inode, u64 file_pos, u64 len);
3644 void btrfs_reloc_cow_block(struct btrfs_trans_handle *trans,
3645 struct btrfs_root *root, struct extent_buffer *buf,
3646 struct extent_buffer *cow);
3647 void btrfs_reloc_pre_snapshot(struct btrfs_trans_handle *trans,
3648 struct btrfs_pending_snapshot *pending,
3649 u64 *bytes_to_reserve);
3650 int btrfs_reloc_post_snapshot(struct btrfs_trans_handle *trans,
3651 struct btrfs_pending_snapshot *pending);
3654 int btrfs_scrub_dev(struct btrfs_fs_info *fs_info, u64 devid, u64 start,
3655 u64 end, struct btrfs_scrub_progress *progress,
3656 int readonly, int is_dev_replace);
3657 void btrfs_scrub_pause(struct btrfs_root *root);
3658 void btrfs_scrub_pause_super(struct btrfs_root *root);
3659 void btrfs_scrub_continue(struct btrfs_root *root);
3660 void btrfs_scrub_continue_super(struct btrfs_root *root);
3661 int btrfs_scrub_cancel(struct btrfs_fs_info *info);
3662 int btrfs_scrub_cancel_dev(struct btrfs_fs_info *info,
3663 struct btrfs_device *dev);
3664 int btrfs_scrub_cancel_devid(struct btrfs_root *root, u64 devid);
3665 int btrfs_scrub_progress(struct btrfs_root *root, u64 devid,
3666 struct btrfs_scrub_progress *progress);
3669 struct reada_control {
3670 struct btrfs_root *root; /* tree to prefetch */
3671 struct btrfs_key key_start;
3672 struct btrfs_key key_end; /* exclusive */
3675 wait_queue_head_t wait;
3677 struct reada_control *btrfs_reada_add(struct btrfs_root *root,
3678 struct btrfs_key *start, struct btrfs_key *end);
3679 int btrfs_reada_wait(void *handle);
3680 void btrfs_reada_detach(void *handle);
3681 int btree_readahead_hook(struct btrfs_root *root, struct extent_buffer *eb,
3682 u64 start, int err);
3685 struct qgroup_update {
3686 struct list_head list;
3687 struct btrfs_delayed_ref_node *node;
3688 struct btrfs_delayed_extent_op *extent_op;
3691 int btrfs_quota_enable(struct btrfs_trans_handle *trans,
3692 struct btrfs_fs_info *fs_info);
3693 int btrfs_quota_disable(struct btrfs_trans_handle *trans,
3694 struct btrfs_fs_info *fs_info);
3695 int btrfs_quota_rescan(struct btrfs_fs_info *fs_info);
3696 int btrfs_add_qgroup_relation(struct btrfs_trans_handle *trans,
3697 struct btrfs_fs_info *fs_info, u64 src, u64 dst);
3698 int btrfs_del_qgroup_relation(struct btrfs_trans_handle *trans,
3699 struct btrfs_fs_info *fs_info, u64 src, u64 dst);
3700 int btrfs_create_qgroup(struct btrfs_trans_handle *trans,
3701 struct btrfs_fs_info *fs_info, u64 qgroupid,
3703 int btrfs_remove_qgroup(struct btrfs_trans_handle *trans,
3704 struct btrfs_fs_info *fs_info, u64 qgroupid);
3705 int btrfs_limit_qgroup(struct btrfs_trans_handle *trans,
3706 struct btrfs_fs_info *fs_info, u64 qgroupid,
3707 struct btrfs_qgroup_limit *limit);
3708 int btrfs_read_qgroup_config(struct btrfs_fs_info *fs_info);
3709 void btrfs_free_qgroup_config(struct btrfs_fs_info *fs_info);
3710 struct btrfs_delayed_extent_op;
3711 int btrfs_qgroup_record_ref(struct btrfs_trans_handle *trans,
3712 struct btrfs_delayed_ref_node *node,
3713 struct btrfs_delayed_extent_op *extent_op);
3714 int btrfs_qgroup_account_ref(struct btrfs_trans_handle *trans,
3715 struct btrfs_fs_info *fs_info,
3716 struct btrfs_delayed_ref_node *node,
3717 struct btrfs_delayed_extent_op *extent_op);
3718 int btrfs_run_qgroups(struct btrfs_trans_handle *trans,
3719 struct btrfs_fs_info *fs_info);
3720 int btrfs_qgroup_inherit(struct btrfs_trans_handle *trans,
3721 struct btrfs_fs_info *fs_info, u64 srcid, u64 objectid,
3722 struct btrfs_qgroup_inherit *inherit);
3723 int btrfs_qgroup_reserve(struct btrfs_root *root, u64 num_bytes);
3724 void btrfs_qgroup_free(struct btrfs_root *root, u64 num_bytes);
3726 void assert_qgroups_uptodate(struct btrfs_trans_handle *trans);
3728 static inline int is_fstree(u64 rootid)
3730 if (rootid == BTRFS_FS_TREE_OBJECTID ||
3731 (s64)rootid >= (s64)BTRFS_FIRST_FREE_OBJECTID)