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 3
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 /* spefic to btrfs_map_block(), therefore not in include/linux/blk_types.h */
178 #define REQ_GET_READ_MIRRORS (1 << 30)
180 #define BTRFS_FT_UNKNOWN 0
181 #define BTRFS_FT_REG_FILE 1
182 #define BTRFS_FT_DIR 2
183 #define BTRFS_FT_CHRDEV 3
184 #define BTRFS_FT_BLKDEV 4
185 #define BTRFS_FT_FIFO 5
186 #define BTRFS_FT_SOCK 6
187 #define BTRFS_FT_SYMLINK 7
188 #define BTRFS_FT_XATTR 8
189 #define BTRFS_FT_MAX 9
191 /* ioprio of readahead is set to idle */
192 #define BTRFS_IOPRIO_READA (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_IDLE, 0))
195 * The key defines the order in the tree, and so it also defines (optimal)
198 * objectid corresponds to the inode number.
200 * type tells us things about the object, and is a kind of stream selector.
201 * so for a given inode, keys with type of 1 might refer to the inode data,
202 * type of 2 may point to file data in the btree and type == 3 may point to
205 * offset is the starting byte offset for this key in the stream.
207 * btrfs_disk_key is in disk byte order. struct btrfs_key is always
208 * in cpu native order. Otherwise they are identical and their sizes
209 * should be the same (ie both packed)
211 struct btrfs_disk_key {
215 } __attribute__ ((__packed__));
221 } __attribute__ ((__packed__));
223 struct btrfs_mapping_tree {
224 struct extent_map_tree map_tree;
227 struct btrfs_dev_item {
228 /* the internal btrfs device id */
231 /* size of the device */
237 /* optimal io alignment for this device */
240 /* optimal io width for this device */
243 /* minimal io size for this device */
246 /* type and info about this device */
249 /* expected generation for this device */
253 * starting byte of this partition on the device,
254 * to allow for stripe alignment in the future
258 /* grouping information for allocation decisions */
261 /* seek speed 0-100 where 100 is fastest */
264 /* bandwidth 0-100 where 100 is fastest */
267 /* btrfs generated uuid for this device */
268 u8 uuid[BTRFS_UUID_SIZE];
270 /* uuid of FS who owns this device */
271 u8 fsid[BTRFS_UUID_SIZE];
272 } __attribute__ ((__packed__));
274 struct btrfs_stripe {
277 u8 dev_uuid[BTRFS_UUID_SIZE];
278 } __attribute__ ((__packed__));
281 /* size of this chunk in bytes */
284 /* objectid of the root referencing this chunk */
290 /* optimal io alignment for this chunk */
293 /* optimal io width for this chunk */
296 /* minimal io size for this chunk */
299 /* 2^16 stripes is quite a lot, a second limit is the size of a single
304 /* sub stripes only matter for raid10 */
306 struct btrfs_stripe stripe;
307 /* additional stripes go here */
308 } __attribute__ ((__packed__));
310 #define BTRFS_FREE_SPACE_EXTENT 1
311 #define BTRFS_FREE_SPACE_BITMAP 2
313 struct btrfs_free_space_entry {
317 } __attribute__ ((__packed__));
319 struct btrfs_free_space_header {
320 struct btrfs_disk_key location;
324 } __attribute__ ((__packed__));
326 static inline unsigned long btrfs_chunk_item_size(int num_stripes)
328 BUG_ON(num_stripes == 0);
329 return sizeof(struct btrfs_chunk) +
330 sizeof(struct btrfs_stripe) * (num_stripes - 1);
333 #define BTRFS_HEADER_FLAG_WRITTEN (1ULL << 0)
334 #define BTRFS_HEADER_FLAG_RELOC (1ULL << 1)
340 /* Errors detected */
341 #define BTRFS_SUPER_FLAG_ERROR (1ULL << 2)
343 #define BTRFS_SUPER_FLAG_SEEDING (1ULL << 32)
344 #define BTRFS_SUPER_FLAG_METADUMP (1ULL << 33)
346 #define BTRFS_BACKREF_REV_MAX 256
347 #define BTRFS_BACKREF_REV_SHIFT 56
348 #define BTRFS_BACKREF_REV_MASK (((u64)BTRFS_BACKREF_REV_MAX - 1) << \
349 BTRFS_BACKREF_REV_SHIFT)
351 #define BTRFS_OLD_BACKREF_REV 0
352 #define BTRFS_MIXED_BACKREF_REV 1
355 * every tree block (leaf or node) starts with this header.
357 struct btrfs_header {
358 /* these first four must match the super block */
359 u8 csum[BTRFS_CSUM_SIZE];
360 u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
361 __le64 bytenr; /* which block this node is supposed to live in */
364 /* allowed to be different from the super from here on down */
365 u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
370 } __attribute__ ((__packed__));
372 #define BTRFS_NODEPTRS_PER_BLOCK(r) (((r)->nodesize - \
373 sizeof(struct btrfs_header)) / \
374 sizeof(struct btrfs_key_ptr))
375 #define __BTRFS_LEAF_DATA_SIZE(bs) ((bs) - sizeof(struct btrfs_header))
376 #define BTRFS_LEAF_DATA_SIZE(r) (__BTRFS_LEAF_DATA_SIZE(r->leafsize))
377 #define BTRFS_MAX_INLINE_DATA_SIZE(r) (BTRFS_LEAF_DATA_SIZE(r) - \
378 sizeof(struct btrfs_item) - \
379 sizeof(struct btrfs_file_extent_item))
380 #define BTRFS_MAX_XATTR_SIZE(r) (BTRFS_LEAF_DATA_SIZE(r) - \
381 sizeof(struct btrfs_item) -\
382 sizeof(struct btrfs_dir_item))
386 * this is a very generous portion of the super block, giving us
387 * room to translate 14 chunks with 3 stripes each.
389 #define BTRFS_SYSTEM_CHUNK_ARRAY_SIZE 2048
390 #define BTRFS_LABEL_SIZE 256
393 * just in case we somehow lose the roots and are not able to mount,
394 * we store an array of the roots from previous transactions
397 #define BTRFS_NUM_BACKUP_ROOTS 4
398 struct btrfs_root_backup {
400 __le64 tree_root_gen;
403 __le64 chunk_root_gen;
406 __le64 extent_root_gen;
415 __le64 csum_root_gen;
425 u8 extent_root_level;
429 /* future and to align */
431 } __attribute__ ((__packed__));
434 * the super block basically lists the main trees of the FS
435 * it currently lacks any block count etc etc
437 struct btrfs_super_block {
438 u8 csum[BTRFS_CSUM_SIZE];
439 /* the first 4 fields must match struct btrfs_header */
440 u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
441 __le64 bytenr; /* this block number */
444 /* allowed to be different from the btrfs_header from here own down */
451 /* this will help find the new super based on the log root */
452 __le64 log_root_transid;
455 __le64 root_dir_objectid;
461 __le32 sys_chunk_array_size;
462 __le64 chunk_root_generation;
464 __le64 compat_ro_flags;
465 __le64 incompat_flags;
470 struct btrfs_dev_item dev_item;
472 char label[BTRFS_LABEL_SIZE];
474 __le64 cache_generation;
476 /* future expansion */
478 u8 sys_chunk_array[BTRFS_SYSTEM_CHUNK_ARRAY_SIZE];
479 struct btrfs_root_backup super_roots[BTRFS_NUM_BACKUP_ROOTS];
480 } __attribute__ ((__packed__));
483 * Compat flags that we support. If any incompat flags are set other than the
484 * ones specified below then we will fail to mount
486 #define BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF (1ULL << 0)
487 #define BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL (1ULL << 1)
488 #define BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS (1ULL << 2)
489 #define BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO (1ULL << 3)
491 * some patches floated around with a second compression method
492 * lets save that incompat here for when they do get in
493 * Note we don't actually support it, we're just reserving the
496 #define BTRFS_FEATURE_INCOMPAT_COMPRESS_LZOv2 (1ULL << 4)
499 * older kernels tried to do bigger metadata blocks, but the
500 * code was pretty buggy. Lets not let them try anymore.
502 #define BTRFS_FEATURE_INCOMPAT_BIG_METADATA (1ULL << 5)
504 #define BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF (1ULL << 6)
506 #define BTRFS_FEATURE_COMPAT_SUPP 0ULL
507 #define BTRFS_FEATURE_COMPAT_RO_SUPP 0ULL
508 #define BTRFS_FEATURE_INCOMPAT_SUPP \
509 (BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF | \
510 BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL | \
511 BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS | \
512 BTRFS_FEATURE_INCOMPAT_BIG_METADATA | \
513 BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO | \
514 BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF)
517 * A leaf is full of items. offset and size tell us where to find
518 * the item in the leaf (relative to the start of the data area)
521 struct btrfs_disk_key key;
524 } __attribute__ ((__packed__));
527 * leaves have an item area and a data area:
528 * [item0, item1....itemN] [free space] [dataN...data1, data0]
530 * The data is separate from the items to get the keys closer together
534 struct btrfs_header header;
535 struct btrfs_item items[];
536 } __attribute__ ((__packed__));
539 * all non-leaf blocks are nodes, they hold only keys and pointers to
542 struct btrfs_key_ptr {
543 struct btrfs_disk_key key;
546 } __attribute__ ((__packed__));
549 struct btrfs_header header;
550 struct btrfs_key_ptr ptrs[];
551 } __attribute__ ((__packed__));
554 * btrfs_paths remember the path taken from the root down to the leaf.
555 * level 0 is always the leaf, and nodes[1...BTRFS_MAX_LEVEL] will point
556 * to any other levels that are present.
558 * The slots array records the index of the item or block pointer
559 * used while walking the tree.
562 struct extent_buffer *nodes[BTRFS_MAX_LEVEL];
563 int slots[BTRFS_MAX_LEVEL];
564 /* if there is real range locking, this locks field will change */
565 int locks[BTRFS_MAX_LEVEL];
567 /* keep some upper locks as we walk down */
571 * set by btrfs_split_item, tells search_slot to keep all locks
572 * and to force calls to keep space in the nodes
574 unsigned int search_for_split:1;
575 unsigned int keep_locks:1;
576 unsigned int skip_locking:1;
577 unsigned int leave_spinning:1;
578 unsigned int search_commit_root:1;
582 * items in the extent btree are used to record the objectid of the
583 * owner of the block and the number of references
586 struct btrfs_extent_item {
590 } __attribute__ ((__packed__));
592 struct btrfs_extent_item_v0 {
594 } __attribute__ ((__packed__));
596 #define BTRFS_MAX_EXTENT_ITEM_SIZE(r) ((BTRFS_LEAF_DATA_SIZE(r) >> 4) - \
597 sizeof(struct btrfs_item))
599 #define BTRFS_EXTENT_FLAG_DATA (1ULL << 0)
600 #define BTRFS_EXTENT_FLAG_TREE_BLOCK (1ULL << 1)
602 /* following flags only apply to tree blocks */
604 /* use full backrefs for extent pointers in the block */
605 #define BTRFS_BLOCK_FLAG_FULL_BACKREF (1ULL << 8)
608 * this flag is only used internally by scrub and may be changed at any time
609 * it is only declared here to avoid collisions
611 #define BTRFS_EXTENT_FLAG_SUPER (1ULL << 48)
613 struct btrfs_tree_block_info {
614 struct btrfs_disk_key key;
616 } __attribute__ ((__packed__));
618 struct btrfs_extent_data_ref {
623 } __attribute__ ((__packed__));
625 struct btrfs_shared_data_ref {
627 } __attribute__ ((__packed__));
629 struct btrfs_extent_inline_ref {
632 } __attribute__ ((__packed__));
634 /* old style backrefs item */
635 struct btrfs_extent_ref_v0 {
640 } __attribute__ ((__packed__));
643 /* dev extents record free space on individual devices. The owner
644 * field points back to the chunk allocation mapping tree that allocated
645 * the extent. The chunk tree uuid field is a way to double check the owner
647 struct btrfs_dev_extent {
649 __le64 chunk_objectid;
652 u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
653 } __attribute__ ((__packed__));
655 struct btrfs_inode_ref {
659 } __attribute__ ((__packed__));
661 struct btrfs_inode_extref {
662 __le64 parent_objectid;
667 } __attribute__ ((__packed__));
669 struct btrfs_timespec {
672 } __attribute__ ((__packed__));
674 enum btrfs_compression_type {
675 BTRFS_COMPRESS_NONE = 0,
676 BTRFS_COMPRESS_ZLIB = 1,
677 BTRFS_COMPRESS_LZO = 2,
678 BTRFS_COMPRESS_TYPES = 2,
679 BTRFS_COMPRESS_LAST = 3,
682 struct btrfs_inode_item {
683 /* nfs style generation number */
685 /* transid that last touched this inode */
697 /* modification sequence number for NFS */
701 * a little future expansion, for more than this we can
702 * just grow the inode item and version it
705 struct btrfs_timespec atime;
706 struct btrfs_timespec ctime;
707 struct btrfs_timespec mtime;
708 struct btrfs_timespec otime;
709 } __attribute__ ((__packed__));
711 struct btrfs_dir_log_item {
713 } __attribute__ ((__packed__));
715 struct btrfs_dir_item {
716 struct btrfs_disk_key location;
721 } __attribute__ ((__packed__));
723 #define BTRFS_ROOT_SUBVOL_RDONLY (1ULL << 0)
725 struct btrfs_root_item {
726 struct btrfs_inode_item inode;
732 __le64 last_snapshot;
735 struct btrfs_disk_key drop_progress;
740 * The following fields appear after subvol_uuids+subvol_times
745 * This generation number is used to test if the new fields are valid
746 * and up to date while reading the root item. Everytime the root item
747 * is written out, the "generation" field is copied into this field. If
748 * anyone ever mounted the fs with an older kernel, we will have
749 * mismatching generation values here and thus must invalidate the
750 * new fields. See btrfs_update_root and btrfs_find_last_root for
752 * the offset of generation_v2 is also used as the start for the memset
753 * when invalidating the fields.
755 __le64 generation_v2;
756 u8 uuid[BTRFS_UUID_SIZE];
757 u8 parent_uuid[BTRFS_UUID_SIZE];
758 u8 received_uuid[BTRFS_UUID_SIZE];
759 __le64 ctransid; /* updated when an inode changes */
760 __le64 otransid; /* trans when created */
761 __le64 stransid; /* trans when sent. non-zero for received subvol */
762 __le64 rtransid; /* trans when received. non-zero for received subvol */
763 struct btrfs_timespec ctime;
764 struct btrfs_timespec otime;
765 struct btrfs_timespec stime;
766 struct btrfs_timespec rtime;
767 __le64 reserved[8]; /* for future */
768 } __attribute__ ((__packed__));
771 * this is used for both forward and backward root refs
773 struct btrfs_root_ref {
777 } __attribute__ ((__packed__));
779 struct btrfs_disk_balance_args {
781 * profiles to operate on, single is denoted by
782 * BTRFS_AVAIL_ALLOC_BIT_SINGLE
792 /* devid subset filter [pstart..pend) */
796 /* btrfs virtual address space subset filter [vstart..vend) */
801 * profile to convert to, single is denoted by
802 * BTRFS_AVAIL_ALLOC_BIT_SINGLE
806 /* BTRFS_BALANCE_ARGS_* */
810 } __attribute__ ((__packed__));
813 * store balance parameters to disk so that balance can be properly
814 * resumed after crash or unmount
816 struct btrfs_balance_item {
817 /* BTRFS_BALANCE_* */
820 struct btrfs_disk_balance_args data;
821 struct btrfs_disk_balance_args meta;
822 struct btrfs_disk_balance_args sys;
825 } __attribute__ ((__packed__));
827 #define BTRFS_FILE_EXTENT_INLINE 0
828 #define BTRFS_FILE_EXTENT_REG 1
829 #define BTRFS_FILE_EXTENT_PREALLOC 2
831 struct btrfs_file_extent_item {
833 * transaction id that created this extent
837 * max number of bytes to hold this extent in ram
838 * when we split a compressed extent we can't know how big
839 * each of the resulting pieces will be. So, this is
840 * an upper limit on the size of the extent in ram instead of
846 * 32 bits for the various ways we might encode the data,
847 * including compression and encryption. If any of these
848 * are set to something a given disk format doesn't understand
849 * it is treated like an incompat flag for reading and writing,
854 __le16 other_encoding; /* spare for later use */
856 /* are we inline data or a real extent? */
860 * disk space consumed by the extent, checksum blocks are included
864 __le64 disk_num_bytes;
866 * the logical offset in file blocks (no csums)
867 * this extent record is for. This allows a file extent to point
868 * into the middle of an existing extent on disk, sharing it
869 * between two snapshots (useful if some bytes in the middle of the
870 * extent have changed
874 * the logical number of file blocks (no csums included). This
875 * always reflects the size uncompressed and without encoding.
879 } __attribute__ ((__packed__));
881 struct btrfs_csum_item {
883 } __attribute__ ((__packed__));
885 struct btrfs_dev_stats_item {
887 * grow this item struct at the end for future enhancements and keep
888 * the existing values unchanged
890 __le64 values[BTRFS_DEV_STAT_VALUES_MAX];
891 } __attribute__ ((__packed__));
893 #define BTRFS_DEV_REPLACE_ITEM_CONT_READING_FROM_SRCDEV_MODE_ALWAYS 0
894 #define BTRFS_DEV_REPLACE_ITEM_CONT_READING_FROM_SRCDEV_MODE_AVOID 1
895 #define BTRFS_DEV_REPLACE_ITEM_STATE_NEVER_STARTED 0
896 #define BTRFS_DEV_REPLACE_ITEM_STATE_STARTED 1
897 #define BTRFS_DEV_REPLACE_ITEM_STATE_SUSPENDED 2
898 #define BTRFS_DEV_REPLACE_ITEM_STATE_FINISHED 3
899 #define BTRFS_DEV_REPLACE_ITEM_STATE_CANCELED 4
901 struct btrfs_dev_replace {
902 u64 replace_state; /* see #define above */
903 u64 time_started; /* seconds since 1-Jan-1970 */
904 u64 time_stopped; /* seconds since 1-Jan-1970 */
905 atomic64_t num_write_errors;
906 atomic64_t num_uncorrectable_read_errors;
909 u64 committed_cursor_left;
910 u64 cursor_left_last_write_of_item;
913 u64 cont_reading_from_srcdev_mode; /* see #define above */
916 int item_needs_writeback;
917 struct btrfs_device *srcdev;
918 struct btrfs_device *tgtdev;
921 atomic_t nesting_level;
922 struct mutex lock_finishing_cancel_unmount;
923 struct mutex lock_management_lock;
926 struct btrfs_scrub_progress scrub_progress;
929 struct btrfs_dev_replace_item {
931 * grow this item struct at the end for future enhancements and keep
932 * the existing values unchanged
937 __le64 cont_reading_from_srcdev_mode;
939 __le64 replace_state;
942 __le64 num_write_errors;
943 __le64 num_uncorrectable_read_errors;
944 } __attribute__ ((__packed__));
946 /* different types of block groups (and chunks) */
947 #define BTRFS_BLOCK_GROUP_DATA (1ULL << 0)
948 #define BTRFS_BLOCK_GROUP_SYSTEM (1ULL << 1)
949 #define BTRFS_BLOCK_GROUP_METADATA (1ULL << 2)
950 #define BTRFS_BLOCK_GROUP_RAID0 (1ULL << 3)
951 #define BTRFS_BLOCK_GROUP_RAID1 (1ULL << 4)
952 #define BTRFS_BLOCK_GROUP_DUP (1ULL << 5)
953 #define BTRFS_BLOCK_GROUP_RAID10 (1ULL << 6)
954 #define BTRFS_BLOCK_GROUP_RESERVED BTRFS_AVAIL_ALLOC_BIT_SINGLE
955 #define BTRFS_NR_RAID_TYPES 5
957 #define BTRFS_BLOCK_GROUP_TYPE_MASK (BTRFS_BLOCK_GROUP_DATA | \
958 BTRFS_BLOCK_GROUP_SYSTEM | \
959 BTRFS_BLOCK_GROUP_METADATA)
961 #define BTRFS_BLOCK_GROUP_PROFILE_MASK (BTRFS_BLOCK_GROUP_RAID0 | \
962 BTRFS_BLOCK_GROUP_RAID1 | \
963 BTRFS_BLOCK_GROUP_DUP | \
964 BTRFS_BLOCK_GROUP_RAID10)
966 * We need a bit for restriper to be able to tell when chunks of type
967 * SINGLE are available. This "extended" profile format is used in
968 * fs_info->avail_*_alloc_bits (in-memory) and balance item fields
969 * (on-disk). The corresponding on-disk bit in chunk.type is reserved
970 * to avoid remappings between two formats in future.
972 #define BTRFS_AVAIL_ALLOC_BIT_SINGLE (1ULL << 48)
974 #define BTRFS_EXTENDED_PROFILE_MASK (BTRFS_BLOCK_GROUP_PROFILE_MASK | \
975 BTRFS_AVAIL_ALLOC_BIT_SINGLE)
977 static inline u64 chunk_to_extended(u64 flags)
979 if ((flags & BTRFS_BLOCK_GROUP_PROFILE_MASK) == 0)
980 flags |= BTRFS_AVAIL_ALLOC_BIT_SINGLE;
984 static inline u64 extended_to_chunk(u64 flags)
986 return flags & ~BTRFS_AVAIL_ALLOC_BIT_SINGLE;
989 struct btrfs_block_group_item {
991 __le64 chunk_objectid;
993 } __attribute__ ((__packed__));
996 * is subvolume quota turned on?
998 #define BTRFS_QGROUP_STATUS_FLAG_ON (1ULL << 0)
1000 * SCANNING is set during the initialization phase
1002 #define BTRFS_QGROUP_STATUS_FLAG_SCANNING (1ULL << 1)
1004 * Some qgroup entries are known to be out of date,
1005 * either because the configuration has changed in a way that
1006 * makes a rescan necessary, or because the fs has been mounted
1007 * with a non-qgroup-aware version.
1008 * Turning qouta off and on again makes it inconsistent, too.
1010 #define BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT (1ULL << 2)
1012 #define BTRFS_QGROUP_STATUS_VERSION 1
1014 struct btrfs_qgroup_status_item {
1017 * the generation is updated during every commit. As older
1018 * versions of btrfs are not aware of qgroups, it will be
1019 * possible to detect inconsistencies by checking the
1020 * generation on mount time
1024 /* flag definitions see above */
1028 * only used during scanning to record the progress
1029 * of the scan. It contains a logical address
1032 } __attribute__ ((__packed__));
1034 struct btrfs_qgroup_info_item {
1040 } __attribute__ ((__packed__));
1042 /* flags definition for qgroup limits */
1043 #define BTRFS_QGROUP_LIMIT_MAX_RFER (1ULL << 0)
1044 #define BTRFS_QGROUP_LIMIT_MAX_EXCL (1ULL << 1)
1045 #define BTRFS_QGROUP_LIMIT_RSV_RFER (1ULL << 2)
1046 #define BTRFS_QGROUP_LIMIT_RSV_EXCL (1ULL << 3)
1047 #define BTRFS_QGROUP_LIMIT_RFER_CMPR (1ULL << 4)
1048 #define BTRFS_QGROUP_LIMIT_EXCL_CMPR (1ULL << 5)
1050 struct btrfs_qgroup_limit_item {
1052 * only updated when any of the other values change
1059 } __attribute__ ((__packed__));
1061 struct btrfs_space_info {
1064 u64 total_bytes; /* total bytes in the space,
1065 this doesn't take mirrors into account */
1066 u64 bytes_used; /* total bytes used,
1067 this doesn't take mirrors into account */
1068 u64 bytes_pinned; /* total bytes pinned, will be freed when the
1069 transaction finishes */
1070 u64 bytes_reserved; /* total bytes the allocator has reserved for
1071 current allocations */
1072 u64 bytes_readonly; /* total bytes that are read only */
1074 u64 bytes_may_use; /* number of bytes that may be used for
1075 delalloc/allocations */
1076 u64 disk_used; /* total bytes used on disk */
1077 u64 disk_total; /* total bytes on disk, takes mirrors into
1081 * we bump reservation progress every time we decrement
1082 * bytes_reserved. This way people waiting for reservations
1083 * know something good has happened and they can check
1084 * for progress. The number here isn't to be trusted, it
1085 * just shows reclaim activity
1087 unsigned long reservation_progress;
1089 unsigned int full:1; /* indicates that we cannot allocate any more
1090 chunks for this space */
1091 unsigned int chunk_alloc:1; /* set if we are allocating a chunk */
1093 unsigned int flush:1; /* set if we are trying to make space */
1095 unsigned int force_alloc; /* set if we need to force a chunk
1096 alloc for this space */
1098 struct list_head list;
1100 /* for block groups in our same type */
1101 struct list_head block_groups[BTRFS_NR_RAID_TYPES];
1103 struct rw_semaphore groups_sem;
1104 wait_queue_head_t wait;
1107 #define BTRFS_BLOCK_RSV_GLOBAL 1
1108 #define BTRFS_BLOCK_RSV_DELALLOC 2
1109 #define BTRFS_BLOCK_RSV_TRANS 3
1110 #define BTRFS_BLOCK_RSV_CHUNK 4
1111 #define BTRFS_BLOCK_RSV_DELOPS 5
1112 #define BTRFS_BLOCK_RSV_EMPTY 6
1113 #define BTRFS_BLOCK_RSV_TEMP 7
1115 struct btrfs_block_rsv {
1118 struct btrfs_space_info *space_info;
1120 unsigned short full;
1121 unsigned short type;
1122 unsigned short failfast;
1126 * free clusters are used to claim free space in relatively large chunks,
1127 * allowing us to do less seeky writes. They are used for all metadata
1128 * allocations and data allocations in ssd mode.
1130 struct btrfs_free_cluster {
1132 spinlock_t refill_lock;
1133 struct rb_root root;
1135 /* largest extent in this cluster */
1138 /* first extent starting offset */
1141 struct btrfs_block_group_cache *block_group;
1143 * when a cluster is allocated from a block group, we put the
1144 * cluster onto a list in the block group so that it can
1145 * be freed before the block group is freed.
1147 struct list_head block_group_list;
1150 enum btrfs_caching_type {
1152 BTRFS_CACHE_STARTED = 1,
1153 BTRFS_CACHE_FAST = 2,
1154 BTRFS_CACHE_FINISHED = 3,
1157 enum btrfs_disk_cache_state {
1158 BTRFS_DC_WRITTEN = 0,
1162 BTRFS_DC_NEED_WRITE = 4,
1165 struct btrfs_caching_control {
1166 struct list_head list;
1168 wait_queue_head_t wait;
1169 struct btrfs_work work;
1170 struct btrfs_block_group_cache *block_group;
1175 struct btrfs_block_group_cache {
1176 struct btrfs_key key;
1177 struct btrfs_block_group_item item;
1178 struct btrfs_fs_info *fs_info;
1179 struct inode *inode;
1186 u64 cache_generation;
1188 unsigned int dirty:1;
1189 unsigned int iref:1;
1191 int disk_cache_state;
1193 /* cache tracking stuff */
1195 struct btrfs_caching_control *caching_ctl;
1196 u64 last_byte_to_unpin;
1198 struct btrfs_space_info *space_info;
1200 /* free space cache stuff */
1201 struct btrfs_free_space_ctl *free_space_ctl;
1203 /* block group cache stuff */
1204 struct rb_node cache_node;
1206 /* for block groups in the same raid type */
1207 struct list_head list;
1212 /* List of struct btrfs_free_clusters for this block group.
1213 * Today it will only have one thing on it, but that may change
1215 struct list_head cluster_list;
1217 /* For delayed block group creation */
1218 struct list_head new_bg_list;
1221 /* delayed seq elem */
1223 struct list_head list;
1228 struct reloc_control;
1229 struct btrfs_device;
1230 struct btrfs_fs_devices;
1231 struct btrfs_balance_control;
1232 struct btrfs_delayed_root;
1233 struct btrfs_fs_info {
1234 u8 fsid[BTRFS_FSID_SIZE];
1235 u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
1236 struct btrfs_root *extent_root;
1237 struct btrfs_root *tree_root;
1238 struct btrfs_root *chunk_root;
1239 struct btrfs_root *dev_root;
1240 struct btrfs_root *fs_root;
1241 struct btrfs_root *csum_root;
1242 struct btrfs_root *quota_root;
1244 /* the log root tree is a directory of all the other log roots */
1245 struct btrfs_root *log_root_tree;
1247 spinlock_t fs_roots_radix_lock;
1248 struct radix_tree_root fs_roots_radix;
1250 /* block group cache stuff */
1251 spinlock_t block_group_cache_lock;
1252 struct rb_root block_group_cache_tree;
1254 /* keep track of unallocated space */
1255 spinlock_t free_chunk_lock;
1256 u64 free_chunk_space;
1258 struct extent_io_tree freed_extents[2];
1259 struct extent_io_tree *pinned_extents;
1261 /* logical->physical extent mapping */
1262 struct btrfs_mapping_tree mapping_tree;
1265 * block reservation for extent, checksum, root tree and
1266 * delayed dir index item
1268 struct btrfs_block_rsv global_block_rsv;
1269 /* block reservation for delay allocation */
1270 struct btrfs_block_rsv delalloc_block_rsv;
1271 /* block reservation for metadata operations */
1272 struct btrfs_block_rsv trans_block_rsv;
1273 /* block reservation for chunk tree */
1274 struct btrfs_block_rsv chunk_block_rsv;
1275 /* block reservation for delayed operations */
1276 struct btrfs_block_rsv delayed_block_rsv;
1278 struct btrfs_block_rsv empty_block_rsv;
1281 u64 last_trans_committed;
1284 * this is updated to the current trans every time a full commit
1285 * is required instead of the faster short fsync log commits
1287 u64 last_trans_log_full_commit;
1288 unsigned long mount_opt;
1289 unsigned long compress_type:4;
1292 struct btrfs_transaction *running_transaction;
1293 wait_queue_head_t transaction_throttle;
1294 wait_queue_head_t transaction_wait;
1295 wait_queue_head_t transaction_blocked_wait;
1296 wait_queue_head_t async_submit_wait;
1298 struct btrfs_super_block *super_copy;
1299 struct btrfs_super_block *super_for_commit;
1300 struct block_device *__bdev;
1301 struct super_block *sb;
1302 struct inode *btree_inode;
1303 struct backing_dev_info bdi;
1304 struct mutex tree_log_mutex;
1305 struct mutex transaction_kthread_mutex;
1306 struct mutex cleaner_mutex;
1307 struct mutex chunk_mutex;
1308 struct mutex volume_mutex;
1310 * this protects the ordered operations list only while we are
1311 * processing all of the entries on it. This way we make
1312 * sure the commit code doesn't find the list temporarily empty
1313 * because another function happens to be doing non-waiting preflush
1314 * before jumping into the main commit.
1316 struct mutex ordered_operations_mutex;
1317 struct rw_semaphore extent_commit_sem;
1319 struct rw_semaphore cleanup_work_sem;
1321 struct rw_semaphore subvol_sem;
1322 struct srcu_struct subvol_srcu;
1324 spinlock_t trans_lock;
1326 * the reloc mutex goes with the trans lock, it is taken
1327 * during commit to protect us from the relocation code
1329 struct mutex reloc_mutex;
1331 struct list_head trans_list;
1332 struct list_head dead_roots;
1333 struct list_head caching_block_groups;
1335 spinlock_t delayed_iput_lock;
1336 struct list_head delayed_iputs;
1338 /* this protects tree_mod_seq_list */
1339 spinlock_t tree_mod_seq_lock;
1340 atomic_t tree_mod_seq;
1341 struct list_head tree_mod_seq_list;
1342 struct seq_list tree_mod_seq_elem;
1344 /* this protects tree_mod_log */
1345 rwlock_t tree_mod_log_lock;
1346 struct rb_root tree_mod_log;
1348 atomic_t nr_async_submits;
1349 atomic_t async_submit_draining;
1350 atomic_t nr_async_bios;
1351 atomic_t async_delalloc_pages;
1352 atomic_t open_ioctl_trans;
1355 * this is used by the balancing code to wait for all the pending
1358 spinlock_t ordered_extent_lock;
1361 * all of the data=ordered extents pending writeback
1362 * these can span multiple transactions and basically include
1363 * every dirty data page that isn't from nodatacow
1365 struct list_head ordered_extents;
1368 * all of the inodes that have delalloc bytes. It is possible for
1369 * this list to be empty even when there is still dirty data=ordered
1370 * extents waiting to finish IO.
1372 struct list_head delalloc_inodes;
1375 * special rename and truncate targets that must be on disk before
1376 * we're allowed to commit. This is basically the ext3 style
1377 * data=ordered list.
1379 struct list_head ordered_operations;
1382 * there is a pool of worker threads for checksumming during writes
1383 * and a pool for checksumming after reads. This is because readers
1384 * can run with FS locks held, and the writers may be waiting for
1385 * those locks. We don't want ordering in the pending list to cause
1386 * deadlocks, and so the two are serviced separately.
1388 * A third pool does submit_bio to avoid deadlocking with the other
1391 struct btrfs_workers generic_worker;
1392 struct btrfs_workers workers;
1393 struct btrfs_workers delalloc_workers;
1394 struct btrfs_workers flush_workers;
1395 struct btrfs_workers endio_workers;
1396 struct btrfs_workers endio_meta_workers;
1397 struct btrfs_workers endio_meta_write_workers;
1398 struct btrfs_workers endio_write_workers;
1399 struct btrfs_workers endio_freespace_worker;
1400 struct btrfs_workers submit_workers;
1401 struct btrfs_workers caching_workers;
1402 struct btrfs_workers readahead_workers;
1405 * fixup workers take dirty pages that didn't properly go through
1406 * the cow mechanism and make them safe to write. It happens
1407 * for the sys_munmap function call path
1409 struct btrfs_workers fixup_workers;
1410 struct btrfs_workers delayed_workers;
1411 struct task_struct *transaction_kthread;
1412 struct task_struct *cleaner_kthread;
1413 int thread_pool_size;
1415 struct kobject super_kobj;
1416 struct completion kobj_unregister;
1419 int log_root_recovering;
1425 /* protected by the delalloc lock, used to keep from writing
1426 * metadata until there is a nice batch
1428 u64 dirty_metadata_bytes;
1429 struct list_head dirty_cowonly_roots;
1431 struct btrfs_fs_devices *fs_devices;
1434 * the space_info list is almost entirely read only. It only changes
1435 * when we add a new raid type to the FS, and that happens
1436 * very rarely. RCU is used to protect it.
1438 struct list_head space_info;
1440 struct btrfs_space_info *data_sinfo;
1442 struct reloc_control *reloc_ctl;
1444 spinlock_t delalloc_lock;
1447 /* data_alloc_cluster is only used in ssd mode */
1448 struct btrfs_free_cluster data_alloc_cluster;
1450 /* all metadata allocations go through this cluster */
1451 struct btrfs_free_cluster meta_alloc_cluster;
1453 /* auto defrag inodes go here */
1454 spinlock_t defrag_inodes_lock;
1455 struct rb_root defrag_inodes;
1456 atomic_t defrag_running;
1459 * these three are in extended format (availability of single
1460 * chunks is denoted by BTRFS_AVAIL_ALLOC_BIT_SINGLE bit, other
1461 * types are denoted by corresponding BTRFS_BLOCK_GROUP_* bits)
1463 u64 avail_data_alloc_bits;
1464 u64 avail_metadata_alloc_bits;
1465 u64 avail_system_alloc_bits;
1467 /* restriper state */
1468 spinlock_t balance_lock;
1469 struct mutex balance_mutex;
1470 atomic_t balance_running;
1471 atomic_t balance_pause_req;
1472 atomic_t balance_cancel_req;
1473 struct btrfs_balance_control *balance_ctl;
1474 wait_queue_head_t balance_wait_q;
1476 unsigned data_chunk_allocations;
1477 unsigned metadata_ratio;
1481 /* private scrub information */
1482 struct mutex scrub_lock;
1483 atomic_t scrubs_running;
1484 atomic_t scrub_pause_req;
1485 atomic_t scrubs_paused;
1486 atomic_t scrub_cancel_req;
1487 wait_queue_head_t scrub_pause_wait;
1488 struct rw_semaphore scrub_super_lock;
1489 int scrub_workers_refcnt;
1490 struct btrfs_workers scrub_workers;
1491 struct btrfs_workers scrub_wr_completion_workers;
1492 struct btrfs_workers scrub_nocow_workers;
1494 #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY
1495 u32 check_integrity_print_mask;
1500 unsigned int quota_enabled:1;
1503 * quota_enabled only changes state after a commit. This holds the
1506 unsigned int pending_quota_state:1;
1508 /* is qgroup tracking in a consistent state? */
1511 /* holds configuration and tracking. Protected by qgroup_lock */
1512 struct rb_root qgroup_tree;
1513 spinlock_t qgroup_lock;
1515 /* list of dirty qgroups to be written at next commit */
1516 struct list_head dirty_qgroups;
1518 /* used by btrfs_qgroup_record_ref for an efficient tree traversal */
1521 /* filesystem state */
1524 struct btrfs_delayed_root *delayed_root;
1526 /* readahead tree */
1527 spinlock_t reada_lock;
1528 struct radix_tree_root reada_tree;
1530 /* next backup root to be overwritten */
1531 int backup_root_index;
1533 int num_tolerated_disk_barrier_failures;
1535 /* device replace state */
1536 struct btrfs_dev_replace dev_replace;
1538 atomic_t mutually_exclusive_operation_running;
1542 * in ram representation of the tree. extent_root is used for all allocations
1543 * and for the extent tree extent_root root.
1546 struct extent_buffer *node;
1548 struct extent_buffer *commit_root;
1549 struct btrfs_root *log_root;
1550 struct btrfs_root *reloc_root;
1552 struct btrfs_root_item root_item;
1553 struct btrfs_key root_key;
1554 struct btrfs_fs_info *fs_info;
1555 struct extent_io_tree dirty_log_pages;
1557 struct kobject root_kobj;
1558 struct completion kobj_unregister;
1559 struct mutex objectid_mutex;
1561 spinlock_t accounting_lock;
1562 struct btrfs_block_rsv *block_rsv;
1564 /* free ino cache stuff */
1565 struct mutex fs_commit_mutex;
1566 struct btrfs_free_space_ctl *free_ino_ctl;
1567 enum btrfs_caching_type cached;
1568 spinlock_t cache_lock;
1569 wait_queue_head_t cache_wait;
1570 struct btrfs_free_space_ctl *free_ino_pinned;
1572 struct inode *cache_inode;
1574 struct mutex log_mutex;
1575 wait_queue_head_t log_writer_wait;
1576 wait_queue_head_t log_commit_wait[2];
1577 atomic_t log_writers;
1578 atomic_t log_commit[2];
1580 unsigned long log_transid;
1581 unsigned long last_log_commit;
1582 pid_t log_start_pid;
1583 bool log_multiple_pids;
1588 /* data allocations are done in sectorsize units */
1591 /* node allocations are done in nodesize units */
1594 /* leaf allocations are done in leafsize units */
1601 u64 highest_objectid;
1603 /* btrfs_record_root_in_trans is a multi-step process,
1604 * and it can race with the balancing code. But the
1605 * race is very small, and only the first time the root
1606 * is added to each transaction. So in_trans_setup
1607 * is used to tell us when more checks are required
1609 unsigned long in_trans_setup;
1614 u64 defrag_trans_start;
1615 struct btrfs_key defrag_progress;
1616 struct btrfs_key defrag_max;
1620 /* the dirty list is only used by non-reference counted roots */
1621 struct list_head dirty_list;
1623 struct list_head root_list;
1625 spinlock_t orphan_lock;
1626 atomic_t orphan_inodes;
1627 struct btrfs_block_rsv *orphan_block_rsv;
1628 int orphan_item_inserted;
1629 int orphan_cleanup_state;
1631 spinlock_t inode_lock;
1632 /* red-black tree that keeps track of in-memory inodes */
1633 struct rb_root inode_tree;
1636 * radix tree that keeps track of delayed nodes of every inode,
1637 * protected by inode_lock
1639 struct radix_tree_root delayed_nodes_tree;
1641 * right now this just gets used so that a root has its own devid
1642 * for stat. It may be used for more later
1648 spinlock_t root_times_lock;
1651 struct btrfs_ioctl_defrag_range_args {
1652 /* start of the defrag operation */
1655 /* number of bytes to defrag, use (u64)-1 to say all */
1659 * flags for the operation, which can include turning
1660 * on compression for this one defrag
1665 * any extent bigger than this will be considered
1666 * already defragged. Use 0 to take the kernel default
1667 * Use 1 to say every single extent must be rewritten
1669 __u32 extent_thresh;
1672 * which compression method to use if turning on compression
1673 * for this defrag operation. If unspecified, zlib will
1676 __u32 compress_type;
1678 /* spare for later */
1684 * inode items have the data typically returned from stat and store other
1685 * info about object characteristics. There is one for every file and dir in
1688 #define BTRFS_INODE_ITEM_KEY 1
1689 #define BTRFS_INODE_REF_KEY 12
1690 #define BTRFS_INODE_EXTREF_KEY 13
1691 #define BTRFS_XATTR_ITEM_KEY 24
1692 #define BTRFS_ORPHAN_ITEM_KEY 48
1693 /* reserve 2-15 close to the inode for later flexibility */
1696 * dir items are the name -> inode pointers in a directory. There is one
1697 * for every name in a directory.
1699 #define BTRFS_DIR_LOG_ITEM_KEY 60
1700 #define BTRFS_DIR_LOG_INDEX_KEY 72
1701 #define BTRFS_DIR_ITEM_KEY 84
1702 #define BTRFS_DIR_INDEX_KEY 96
1704 * extent data is for file data
1706 #define BTRFS_EXTENT_DATA_KEY 108
1709 * extent csums are stored in a separate tree and hold csums for
1710 * an entire extent on disk.
1712 #define BTRFS_EXTENT_CSUM_KEY 128
1715 * root items point to tree roots. They are typically in the root
1716 * tree used by the super block to find all the other trees
1718 #define BTRFS_ROOT_ITEM_KEY 132
1721 * root backrefs tie subvols and snapshots to the directory entries that
1724 #define BTRFS_ROOT_BACKREF_KEY 144
1727 * root refs make a fast index for listing all of the snapshots and
1728 * subvolumes referenced by a given root. They point directly to the
1729 * directory item in the root that references the subvol
1731 #define BTRFS_ROOT_REF_KEY 156
1734 * extent items are in the extent map tree. These record which blocks
1735 * are used, and how many references there are to each block
1737 #define BTRFS_EXTENT_ITEM_KEY 168
1739 #define BTRFS_TREE_BLOCK_REF_KEY 176
1741 #define BTRFS_EXTENT_DATA_REF_KEY 178
1743 #define BTRFS_EXTENT_REF_V0_KEY 180
1745 #define BTRFS_SHARED_BLOCK_REF_KEY 182
1747 #define BTRFS_SHARED_DATA_REF_KEY 184
1750 * block groups give us hints into the extent allocation trees. Which
1751 * blocks are free etc etc
1753 #define BTRFS_BLOCK_GROUP_ITEM_KEY 192
1755 #define BTRFS_DEV_EXTENT_KEY 204
1756 #define BTRFS_DEV_ITEM_KEY 216
1757 #define BTRFS_CHUNK_ITEM_KEY 228
1760 * Records the overall state of the qgroups.
1761 * There's only one instance of this key present,
1762 * (0, BTRFS_QGROUP_STATUS_KEY, 0)
1764 #define BTRFS_QGROUP_STATUS_KEY 240
1766 * Records the currently used space of the qgroup.
1767 * One key per qgroup, (0, BTRFS_QGROUP_INFO_KEY, qgroupid).
1769 #define BTRFS_QGROUP_INFO_KEY 242
1771 * Contains the user configured limits for the qgroup.
1772 * One key per qgroup, (0, BTRFS_QGROUP_LIMIT_KEY, qgroupid).
1774 #define BTRFS_QGROUP_LIMIT_KEY 244
1776 * Records the child-parent relationship of qgroups. For
1777 * each relation, 2 keys are present:
1778 * (childid, BTRFS_QGROUP_RELATION_KEY, parentid)
1779 * (parentid, BTRFS_QGROUP_RELATION_KEY, childid)
1781 #define BTRFS_QGROUP_RELATION_KEY 246
1783 #define BTRFS_BALANCE_ITEM_KEY 248
1786 * Persistantly stores the io stats in the device tree.
1787 * One key for all stats, (0, BTRFS_DEV_STATS_KEY, devid).
1789 #define BTRFS_DEV_STATS_KEY 249
1792 * Persistantly stores the device replace state in the device tree.
1793 * The key is built like this: (0, BTRFS_DEV_REPLACE_KEY, 0).
1795 #define BTRFS_DEV_REPLACE_KEY 250
1798 * string items are for debugging. They just store a short string of
1801 #define BTRFS_STRING_ITEM_KEY 253
1804 * Flags for mount options.
1806 * Note: don't forget to add new options to btrfs_show_options()
1808 #define BTRFS_MOUNT_NODATASUM (1 << 0)
1809 #define BTRFS_MOUNT_NODATACOW (1 << 1)
1810 #define BTRFS_MOUNT_NOBARRIER (1 << 2)
1811 #define BTRFS_MOUNT_SSD (1 << 3)
1812 #define BTRFS_MOUNT_DEGRADED (1 << 4)
1813 #define BTRFS_MOUNT_COMPRESS (1 << 5)
1814 #define BTRFS_MOUNT_NOTREELOG (1 << 6)
1815 #define BTRFS_MOUNT_FLUSHONCOMMIT (1 << 7)
1816 #define BTRFS_MOUNT_SSD_SPREAD (1 << 8)
1817 #define BTRFS_MOUNT_NOSSD (1 << 9)
1818 #define BTRFS_MOUNT_DISCARD (1 << 10)
1819 #define BTRFS_MOUNT_FORCE_COMPRESS (1 << 11)
1820 #define BTRFS_MOUNT_SPACE_CACHE (1 << 12)
1821 #define BTRFS_MOUNT_CLEAR_CACHE (1 << 13)
1822 #define BTRFS_MOUNT_USER_SUBVOL_RM_ALLOWED (1 << 14)
1823 #define BTRFS_MOUNT_ENOSPC_DEBUG (1 << 15)
1824 #define BTRFS_MOUNT_AUTO_DEFRAG (1 << 16)
1825 #define BTRFS_MOUNT_INODE_MAP_CACHE (1 << 17)
1826 #define BTRFS_MOUNT_RECOVERY (1 << 18)
1827 #define BTRFS_MOUNT_SKIP_BALANCE (1 << 19)
1828 #define BTRFS_MOUNT_CHECK_INTEGRITY (1 << 20)
1829 #define BTRFS_MOUNT_CHECK_INTEGRITY_INCLUDING_EXTENT_DATA (1 << 21)
1830 #define BTRFS_MOUNT_PANIC_ON_FATAL_ERROR (1 << 22)
1832 #define btrfs_clear_opt(o, opt) ((o) &= ~BTRFS_MOUNT_##opt)
1833 #define btrfs_set_opt(o, opt) ((o) |= BTRFS_MOUNT_##opt)
1834 #define btrfs_test_opt(root, opt) ((root)->fs_info->mount_opt & \
1839 #define BTRFS_INODE_NODATASUM (1 << 0)
1840 #define BTRFS_INODE_NODATACOW (1 << 1)
1841 #define BTRFS_INODE_READONLY (1 << 2)
1842 #define BTRFS_INODE_NOCOMPRESS (1 << 3)
1843 #define BTRFS_INODE_PREALLOC (1 << 4)
1844 #define BTRFS_INODE_SYNC (1 << 5)
1845 #define BTRFS_INODE_IMMUTABLE (1 << 6)
1846 #define BTRFS_INODE_APPEND (1 << 7)
1847 #define BTRFS_INODE_NODUMP (1 << 8)
1848 #define BTRFS_INODE_NOATIME (1 << 9)
1849 #define BTRFS_INODE_DIRSYNC (1 << 10)
1850 #define BTRFS_INODE_COMPRESS (1 << 11)
1852 #define BTRFS_INODE_ROOT_ITEM_INIT (1 << 31)
1854 struct btrfs_map_token {
1855 struct extent_buffer *eb;
1857 unsigned long offset;
1860 static inline void btrfs_init_map_token (struct btrfs_map_token *token)
1862 memset(token, 0, sizeof(*token));
1865 /* some macros to generate set/get funcs for the struct fields. This
1866 * assumes there is a lefoo_to_cpu for every type, so lets make a simple
1869 #define le8_to_cpu(v) (v)
1870 #define cpu_to_le8(v) (v)
1873 #define read_eb_member(eb, ptr, type, member, result) ( \
1874 read_extent_buffer(eb, (char *)(result), \
1875 ((unsigned long)(ptr)) + \
1876 offsetof(type, member), \
1877 sizeof(((type *)0)->member)))
1879 #define write_eb_member(eb, ptr, type, member, result) ( \
1880 write_extent_buffer(eb, (char *)(result), \
1881 ((unsigned long)(ptr)) + \
1882 offsetof(type, member), \
1883 sizeof(((type *)0)->member)))
1885 #define DECLARE_BTRFS_SETGET_BITS(bits) \
1886 u##bits btrfs_get_token_##bits(struct extent_buffer *eb, void *ptr, \
1887 unsigned long off, \
1888 struct btrfs_map_token *token); \
1889 void btrfs_set_token_##bits(struct extent_buffer *eb, void *ptr, \
1890 unsigned long off, u##bits val, \
1891 struct btrfs_map_token *token); \
1892 static inline u##bits btrfs_get_##bits(struct extent_buffer *eb, void *ptr, \
1893 unsigned long off) \
1895 return btrfs_get_token_##bits(eb, ptr, off, NULL); \
1897 static inline void btrfs_set_##bits(struct extent_buffer *eb, void *ptr, \
1898 unsigned long off, u##bits val) \
1900 btrfs_set_token_##bits(eb, ptr, off, val, NULL); \
1903 DECLARE_BTRFS_SETGET_BITS(8)
1904 DECLARE_BTRFS_SETGET_BITS(16)
1905 DECLARE_BTRFS_SETGET_BITS(32)
1906 DECLARE_BTRFS_SETGET_BITS(64)
1908 #define BTRFS_SETGET_FUNCS(name, type, member, bits) \
1909 static inline u##bits btrfs_##name(struct extent_buffer *eb, type *s) \
1911 BUILD_BUG_ON(sizeof(u##bits) != sizeof(((type *)0))->member); \
1912 return btrfs_get_##bits(eb, s, offsetof(type, member)); \
1914 static inline void btrfs_set_##name(struct extent_buffer *eb, type *s, \
1917 BUILD_BUG_ON(sizeof(u##bits) != sizeof(((type *)0))->member); \
1918 btrfs_set_##bits(eb, s, offsetof(type, member), val); \
1920 static inline u##bits btrfs_token_##name(struct extent_buffer *eb, type *s, \
1921 struct btrfs_map_token *token) \
1923 BUILD_BUG_ON(sizeof(u##bits) != sizeof(((type *)0))->member); \
1924 return btrfs_get_token_##bits(eb, s, offsetof(type, member), token); \
1926 static inline void btrfs_set_token_##name(struct extent_buffer *eb, \
1927 type *s, u##bits val, \
1928 struct btrfs_map_token *token) \
1930 BUILD_BUG_ON(sizeof(u##bits) != sizeof(((type *)0))->member); \
1931 btrfs_set_token_##bits(eb, s, offsetof(type, member), val, token); \
1934 #define BTRFS_SETGET_HEADER_FUNCS(name, type, member, bits) \
1935 static inline u##bits btrfs_##name(struct extent_buffer *eb) \
1937 type *p = page_address(eb->pages[0]); \
1938 u##bits res = le##bits##_to_cpu(p->member); \
1941 static inline void btrfs_set_##name(struct extent_buffer *eb, \
1944 type *p = page_address(eb->pages[0]); \
1945 p->member = cpu_to_le##bits(val); \
1948 #define BTRFS_SETGET_STACK_FUNCS(name, type, member, bits) \
1949 static inline u##bits btrfs_##name(type *s) \
1951 return le##bits##_to_cpu(s->member); \
1953 static inline void btrfs_set_##name(type *s, u##bits val) \
1955 s->member = cpu_to_le##bits(val); \
1958 BTRFS_SETGET_FUNCS(device_type, struct btrfs_dev_item, type, 64);
1959 BTRFS_SETGET_FUNCS(device_total_bytes, struct btrfs_dev_item, total_bytes, 64);
1960 BTRFS_SETGET_FUNCS(device_bytes_used, struct btrfs_dev_item, bytes_used, 64);
1961 BTRFS_SETGET_FUNCS(device_io_align, struct btrfs_dev_item, io_align, 32);
1962 BTRFS_SETGET_FUNCS(device_io_width, struct btrfs_dev_item, io_width, 32);
1963 BTRFS_SETGET_FUNCS(device_start_offset, struct btrfs_dev_item,
1965 BTRFS_SETGET_FUNCS(device_sector_size, struct btrfs_dev_item, sector_size, 32);
1966 BTRFS_SETGET_FUNCS(device_id, struct btrfs_dev_item, devid, 64);
1967 BTRFS_SETGET_FUNCS(device_group, struct btrfs_dev_item, dev_group, 32);
1968 BTRFS_SETGET_FUNCS(device_seek_speed, struct btrfs_dev_item, seek_speed, 8);
1969 BTRFS_SETGET_FUNCS(device_bandwidth, struct btrfs_dev_item, bandwidth, 8);
1970 BTRFS_SETGET_FUNCS(device_generation, struct btrfs_dev_item, generation, 64);
1972 BTRFS_SETGET_STACK_FUNCS(stack_device_type, struct btrfs_dev_item, type, 64);
1973 BTRFS_SETGET_STACK_FUNCS(stack_device_total_bytes, struct btrfs_dev_item,
1975 BTRFS_SETGET_STACK_FUNCS(stack_device_bytes_used, struct btrfs_dev_item,
1977 BTRFS_SETGET_STACK_FUNCS(stack_device_io_align, struct btrfs_dev_item,
1979 BTRFS_SETGET_STACK_FUNCS(stack_device_io_width, struct btrfs_dev_item,
1981 BTRFS_SETGET_STACK_FUNCS(stack_device_sector_size, struct btrfs_dev_item,
1983 BTRFS_SETGET_STACK_FUNCS(stack_device_id, struct btrfs_dev_item, devid, 64);
1984 BTRFS_SETGET_STACK_FUNCS(stack_device_group, struct btrfs_dev_item,
1986 BTRFS_SETGET_STACK_FUNCS(stack_device_seek_speed, struct btrfs_dev_item,
1988 BTRFS_SETGET_STACK_FUNCS(stack_device_bandwidth, struct btrfs_dev_item,
1990 BTRFS_SETGET_STACK_FUNCS(stack_device_generation, struct btrfs_dev_item,
1993 static inline char *btrfs_device_uuid(struct btrfs_dev_item *d)
1995 return (char *)d + offsetof(struct btrfs_dev_item, uuid);
1998 static inline char *btrfs_device_fsid(struct btrfs_dev_item *d)
2000 return (char *)d + offsetof(struct btrfs_dev_item, fsid);
2003 BTRFS_SETGET_FUNCS(chunk_length, struct btrfs_chunk, length, 64);
2004 BTRFS_SETGET_FUNCS(chunk_owner, struct btrfs_chunk, owner, 64);
2005 BTRFS_SETGET_FUNCS(chunk_stripe_len, struct btrfs_chunk, stripe_len, 64);
2006 BTRFS_SETGET_FUNCS(chunk_io_align, struct btrfs_chunk, io_align, 32);
2007 BTRFS_SETGET_FUNCS(chunk_io_width, struct btrfs_chunk, io_width, 32);
2008 BTRFS_SETGET_FUNCS(chunk_sector_size, struct btrfs_chunk, sector_size, 32);
2009 BTRFS_SETGET_FUNCS(chunk_type, struct btrfs_chunk, type, 64);
2010 BTRFS_SETGET_FUNCS(chunk_num_stripes, struct btrfs_chunk, num_stripes, 16);
2011 BTRFS_SETGET_FUNCS(chunk_sub_stripes, struct btrfs_chunk, sub_stripes, 16);
2012 BTRFS_SETGET_FUNCS(stripe_devid, struct btrfs_stripe, devid, 64);
2013 BTRFS_SETGET_FUNCS(stripe_offset, struct btrfs_stripe, offset, 64);
2015 static inline char *btrfs_stripe_dev_uuid(struct btrfs_stripe *s)
2017 return (char *)s + offsetof(struct btrfs_stripe, dev_uuid);
2020 BTRFS_SETGET_STACK_FUNCS(stack_chunk_length, struct btrfs_chunk, length, 64);
2021 BTRFS_SETGET_STACK_FUNCS(stack_chunk_owner, struct btrfs_chunk, owner, 64);
2022 BTRFS_SETGET_STACK_FUNCS(stack_chunk_stripe_len, struct btrfs_chunk,
2024 BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_align, struct btrfs_chunk,
2026 BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_width, struct btrfs_chunk,
2028 BTRFS_SETGET_STACK_FUNCS(stack_chunk_sector_size, struct btrfs_chunk,
2030 BTRFS_SETGET_STACK_FUNCS(stack_chunk_type, struct btrfs_chunk, type, 64);
2031 BTRFS_SETGET_STACK_FUNCS(stack_chunk_num_stripes, struct btrfs_chunk,
2033 BTRFS_SETGET_STACK_FUNCS(stack_chunk_sub_stripes, struct btrfs_chunk,
2035 BTRFS_SETGET_STACK_FUNCS(stack_stripe_devid, struct btrfs_stripe, devid, 64);
2036 BTRFS_SETGET_STACK_FUNCS(stack_stripe_offset, struct btrfs_stripe, offset, 64);
2038 static inline struct btrfs_stripe *btrfs_stripe_nr(struct btrfs_chunk *c,
2041 unsigned long offset = (unsigned long)c;
2042 offset += offsetof(struct btrfs_chunk, stripe);
2043 offset += nr * sizeof(struct btrfs_stripe);
2044 return (struct btrfs_stripe *)offset;
2047 static inline char *btrfs_stripe_dev_uuid_nr(struct btrfs_chunk *c, int nr)
2049 return btrfs_stripe_dev_uuid(btrfs_stripe_nr(c, nr));
2052 static inline u64 btrfs_stripe_offset_nr(struct extent_buffer *eb,
2053 struct btrfs_chunk *c, int nr)
2055 return btrfs_stripe_offset(eb, btrfs_stripe_nr(c, nr));
2058 static inline u64 btrfs_stripe_devid_nr(struct extent_buffer *eb,
2059 struct btrfs_chunk *c, int nr)
2061 return btrfs_stripe_devid(eb, btrfs_stripe_nr(c, nr));
2064 /* struct btrfs_block_group_item */
2065 BTRFS_SETGET_STACK_FUNCS(block_group_used, struct btrfs_block_group_item,
2067 BTRFS_SETGET_FUNCS(disk_block_group_used, struct btrfs_block_group_item,
2069 BTRFS_SETGET_STACK_FUNCS(block_group_chunk_objectid,
2070 struct btrfs_block_group_item, chunk_objectid, 64);
2072 BTRFS_SETGET_FUNCS(disk_block_group_chunk_objectid,
2073 struct btrfs_block_group_item, chunk_objectid, 64);
2074 BTRFS_SETGET_FUNCS(disk_block_group_flags,
2075 struct btrfs_block_group_item, flags, 64);
2076 BTRFS_SETGET_STACK_FUNCS(block_group_flags,
2077 struct btrfs_block_group_item, flags, 64);
2079 /* struct btrfs_inode_ref */
2080 BTRFS_SETGET_FUNCS(inode_ref_name_len, struct btrfs_inode_ref, name_len, 16);
2081 BTRFS_SETGET_FUNCS(inode_ref_index, struct btrfs_inode_ref, index, 64);
2083 /* struct btrfs_inode_extref */
2084 BTRFS_SETGET_FUNCS(inode_extref_parent, struct btrfs_inode_extref,
2085 parent_objectid, 64);
2086 BTRFS_SETGET_FUNCS(inode_extref_name_len, struct btrfs_inode_extref,
2088 BTRFS_SETGET_FUNCS(inode_extref_index, struct btrfs_inode_extref, index, 64);
2090 /* struct btrfs_inode_item */
2091 BTRFS_SETGET_FUNCS(inode_generation, struct btrfs_inode_item, generation, 64);
2092 BTRFS_SETGET_FUNCS(inode_sequence, struct btrfs_inode_item, sequence, 64);
2093 BTRFS_SETGET_FUNCS(inode_transid, struct btrfs_inode_item, transid, 64);
2094 BTRFS_SETGET_FUNCS(inode_size, struct btrfs_inode_item, size, 64);
2095 BTRFS_SETGET_FUNCS(inode_nbytes, struct btrfs_inode_item, nbytes, 64);
2096 BTRFS_SETGET_FUNCS(inode_block_group, struct btrfs_inode_item, block_group, 64);
2097 BTRFS_SETGET_FUNCS(inode_nlink, struct btrfs_inode_item, nlink, 32);
2098 BTRFS_SETGET_FUNCS(inode_uid, struct btrfs_inode_item, uid, 32);
2099 BTRFS_SETGET_FUNCS(inode_gid, struct btrfs_inode_item, gid, 32);
2100 BTRFS_SETGET_FUNCS(inode_mode, struct btrfs_inode_item, mode, 32);
2101 BTRFS_SETGET_FUNCS(inode_rdev, struct btrfs_inode_item, rdev, 64);
2102 BTRFS_SETGET_FUNCS(inode_flags, struct btrfs_inode_item, flags, 64);
2104 static inline struct btrfs_timespec *
2105 btrfs_inode_atime(struct btrfs_inode_item *inode_item)
2107 unsigned long ptr = (unsigned long)inode_item;
2108 ptr += offsetof(struct btrfs_inode_item, atime);
2109 return (struct btrfs_timespec *)ptr;
2112 static inline struct btrfs_timespec *
2113 btrfs_inode_mtime(struct btrfs_inode_item *inode_item)
2115 unsigned long ptr = (unsigned long)inode_item;
2116 ptr += offsetof(struct btrfs_inode_item, mtime);
2117 return (struct btrfs_timespec *)ptr;
2120 static inline struct btrfs_timespec *
2121 btrfs_inode_ctime(struct btrfs_inode_item *inode_item)
2123 unsigned long ptr = (unsigned long)inode_item;
2124 ptr += offsetof(struct btrfs_inode_item, ctime);
2125 return (struct btrfs_timespec *)ptr;
2128 BTRFS_SETGET_FUNCS(timespec_sec, struct btrfs_timespec, sec, 64);
2129 BTRFS_SETGET_FUNCS(timespec_nsec, struct btrfs_timespec, nsec, 32);
2131 /* struct btrfs_dev_extent */
2132 BTRFS_SETGET_FUNCS(dev_extent_chunk_tree, struct btrfs_dev_extent,
2134 BTRFS_SETGET_FUNCS(dev_extent_chunk_objectid, struct btrfs_dev_extent,
2135 chunk_objectid, 64);
2136 BTRFS_SETGET_FUNCS(dev_extent_chunk_offset, struct btrfs_dev_extent,
2138 BTRFS_SETGET_FUNCS(dev_extent_length, struct btrfs_dev_extent, length, 64);
2140 static inline u8 *btrfs_dev_extent_chunk_tree_uuid(struct btrfs_dev_extent *dev)
2142 unsigned long ptr = offsetof(struct btrfs_dev_extent, chunk_tree_uuid);
2143 return (u8 *)((unsigned long)dev + ptr);
2146 BTRFS_SETGET_FUNCS(extent_refs, struct btrfs_extent_item, refs, 64);
2147 BTRFS_SETGET_FUNCS(extent_generation, struct btrfs_extent_item,
2149 BTRFS_SETGET_FUNCS(extent_flags, struct btrfs_extent_item, flags, 64);
2151 BTRFS_SETGET_FUNCS(extent_refs_v0, struct btrfs_extent_item_v0, refs, 32);
2154 BTRFS_SETGET_FUNCS(tree_block_level, struct btrfs_tree_block_info, level, 8);
2156 static inline void btrfs_tree_block_key(struct extent_buffer *eb,
2157 struct btrfs_tree_block_info *item,
2158 struct btrfs_disk_key *key)
2160 read_eb_member(eb, item, struct btrfs_tree_block_info, key, key);
2163 static inline void btrfs_set_tree_block_key(struct extent_buffer *eb,
2164 struct btrfs_tree_block_info *item,
2165 struct btrfs_disk_key *key)
2167 write_eb_member(eb, item, struct btrfs_tree_block_info, key, key);
2170 BTRFS_SETGET_FUNCS(extent_data_ref_root, struct btrfs_extent_data_ref,
2172 BTRFS_SETGET_FUNCS(extent_data_ref_objectid, struct btrfs_extent_data_ref,
2174 BTRFS_SETGET_FUNCS(extent_data_ref_offset, struct btrfs_extent_data_ref,
2176 BTRFS_SETGET_FUNCS(extent_data_ref_count, struct btrfs_extent_data_ref,
2179 BTRFS_SETGET_FUNCS(shared_data_ref_count, struct btrfs_shared_data_ref,
2182 BTRFS_SETGET_FUNCS(extent_inline_ref_type, struct btrfs_extent_inline_ref,
2184 BTRFS_SETGET_FUNCS(extent_inline_ref_offset, struct btrfs_extent_inline_ref,
2187 static inline u32 btrfs_extent_inline_ref_size(int type)
2189 if (type == BTRFS_TREE_BLOCK_REF_KEY ||
2190 type == BTRFS_SHARED_BLOCK_REF_KEY)
2191 return sizeof(struct btrfs_extent_inline_ref);
2192 if (type == BTRFS_SHARED_DATA_REF_KEY)
2193 return sizeof(struct btrfs_shared_data_ref) +
2194 sizeof(struct btrfs_extent_inline_ref);
2195 if (type == BTRFS_EXTENT_DATA_REF_KEY)
2196 return sizeof(struct btrfs_extent_data_ref) +
2197 offsetof(struct btrfs_extent_inline_ref, offset);
2202 BTRFS_SETGET_FUNCS(ref_root_v0, struct btrfs_extent_ref_v0, root, 64);
2203 BTRFS_SETGET_FUNCS(ref_generation_v0, struct btrfs_extent_ref_v0,
2205 BTRFS_SETGET_FUNCS(ref_objectid_v0, struct btrfs_extent_ref_v0, objectid, 64);
2206 BTRFS_SETGET_FUNCS(ref_count_v0, struct btrfs_extent_ref_v0, count, 32);
2208 /* struct btrfs_node */
2209 BTRFS_SETGET_FUNCS(key_blockptr, struct btrfs_key_ptr, blockptr, 64);
2210 BTRFS_SETGET_FUNCS(key_generation, struct btrfs_key_ptr, generation, 64);
2212 static inline u64 btrfs_node_blockptr(struct extent_buffer *eb, int nr)
2215 ptr = offsetof(struct btrfs_node, ptrs) +
2216 sizeof(struct btrfs_key_ptr) * nr;
2217 return btrfs_key_blockptr(eb, (struct btrfs_key_ptr *)ptr);
2220 static inline void btrfs_set_node_blockptr(struct extent_buffer *eb,
2224 ptr = offsetof(struct btrfs_node, ptrs) +
2225 sizeof(struct btrfs_key_ptr) * nr;
2226 btrfs_set_key_blockptr(eb, (struct btrfs_key_ptr *)ptr, val);
2229 static inline u64 btrfs_node_ptr_generation(struct extent_buffer *eb, int nr)
2232 ptr = offsetof(struct btrfs_node, ptrs) +
2233 sizeof(struct btrfs_key_ptr) * nr;
2234 return btrfs_key_generation(eb, (struct btrfs_key_ptr *)ptr);
2237 static inline void btrfs_set_node_ptr_generation(struct extent_buffer *eb,
2241 ptr = offsetof(struct btrfs_node, ptrs) +
2242 sizeof(struct btrfs_key_ptr) * nr;
2243 btrfs_set_key_generation(eb, (struct btrfs_key_ptr *)ptr, val);
2246 static inline unsigned long btrfs_node_key_ptr_offset(int nr)
2248 return offsetof(struct btrfs_node, ptrs) +
2249 sizeof(struct btrfs_key_ptr) * nr;
2252 void btrfs_node_key(struct extent_buffer *eb,
2253 struct btrfs_disk_key *disk_key, int nr);
2255 static inline void btrfs_set_node_key(struct extent_buffer *eb,
2256 struct btrfs_disk_key *disk_key, int nr)
2259 ptr = btrfs_node_key_ptr_offset(nr);
2260 write_eb_member(eb, (struct btrfs_key_ptr *)ptr,
2261 struct btrfs_key_ptr, key, disk_key);
2264 /* struct btrfs_item */
2265 BTRFS_SETGET_FUNCS(item_offset, struct btrfs_item, offset, 32);
2266 BTRFS_SETGET_FUNCS(item_size, struct btrfs_item, size, 32);
2268 static inline unsigned long btrfs_item_nr_offset(int nr)
2270 return offsetof(struct btrfs_leaf, items) +
2271 sizeof(struct btrfs_item) * nr;
2274 static inline struct btrfs_item *btrfs_item_nr(struct extent_buffer *eb,
2277 return (struct btrfs_item *)btrfs_item_nr_offset(nr);
2280 static inline u32 btrfs_item_end(struct extent_buffer *eb,
2281 struct btrfs_item *item)
2283 return btrfs_item_offset(eb, item) + btrfs_item_size(eb, item);
2286 static inline u32 btrfs_item_end_nr(struct extent_buffer *eb, int nr)
2288 return btrfs_item_end(eb, btrfs_item_nr(eb, nr));
2291 static inline u32 btrfs_item_offset_nr(struct extent_buffer *eb, int nr)
2293 return btrfs_item_offset(eb, btrfs_item_nr(eb, nr));
2296 static inline u32 btrfs_item_size_nr(struct extent_buffer *eb, int nr)
2298 return btrfs_item_size(eb, btrfs_item_nr(eb, nr));
2301 static inline void btrfs_item_key(struct extent_buffer *eb,
2302 struct btrfs_disk_key *disk_key, int nr)
2304 struct btrfs_item *item = btrfs_item_nr(eb, nr);
2305 read_eb_member(eb, item, struct btrfs_item, key, disk_key);
2308 static inline void btrfs_set_item_key(struct extent_buffer *eb,
2309 struct btrfs_disk_key *disk_key, int nr)
2311 struct btrfs_item *item = btrfs_item_nr(eb, nr);
2312 write_eb_member(eb, item, struct btrfs_item, key, disk_key);
2315 BTRFS_SETGET_FUNCS(dir_log_end, struct btrfs_dir_log_item, end, 64);
2318 * struct btrfs_root_ref
2320 BTRFS_SETGET_FUNCS(root_ref_dirid, struct btrfs_root_ref, dirid, 64);
2321 BTRFS_SETGET_FUNCS(root_ref_sequence, struct btrfs_root_ref, sequence, 64);
2322 BTRFS_SETGET_FUNCS(root_ref_name_len, struct btrfs_root_ref, name_len, 16);
2324 /* struct btrfs_dir_item */
2325 BTRFS_SETGET_FUNCS(dir_data_len, struct btrfs_dir_item, data_len, 16);
2326 BTRFS_SETGET_FUNCS(dir_type, struct btrfs_dir_item, type, 8);
2327 BTRFS_SETGET_FUNCS(dir_name_len, struct btrfs_dir_item, name_len, 16);
2328 BTRFS_SETGET_FUNCS(dir_transid, struct btrfs_dir_item, transid, 64);
2330 static inline void btrfs_dir_item_key(struct extent_buffer *eb,
2331 struct btrfs_dir_item *item,
2332 struct btrfs_disk_key *key)
2334 read_eb_member(eb, item, struct btrfs_dir_item, location, key);
2337 static inline void btrfs_set_dir_item_key(struct extent_buffer *eb,
2338 struct btrfs_dir_item *item,
2339 struct btrfs_disk_key *key)
2341 write_eb_member(eb, item, struct btrfs_dir_item, location, key);
2344 BTRFS_SETGET_FUNCS(free_space_entries, struct btrfs_free_space_header,
2346 BTRFS_SETGET_FUNCS(free_space_bitmaps, struct btrfs_free_space_header,
2348 BTRFS_SETGET_FUNCS(free_space_generation, struct btrfs_free_space_header,
2351 static inline void btrfs_free_space_key(struct extent_buffer *eb,
2352 struct btrfs_free_space_header *h,
2353 struct btrfs_disk_key *key)
2355 read_eb_member(eb, h, struct btrfs_free_space_header, location, key);
2358 static inline void btrfs_set_free_space_key(struct extent_buffer *eb,
2359 struct btrfs_free_space_header *h,
2360 struct btrfs_disk_key *key)
2362 write_eb_member(eb, h, struct btrfs_free_space_header, location, key);
2365 /* struct btrfs_disk_key */
2366 BTRFS_SETGET_STACK_FUNCS(disk_key_objectid, struct btrfs_disk_key,
2368 BTRFS_SETGET_STACK_FUNCS(disk_key_offset, struct btrfs_disk_key, offset, 64);
2369 BTRFS_SETGET_STACK_FUNCS(disk_key_type, struct btrfs_disk_key, type, 8);
2371 static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu,
2372 struct btrfs_disk_key *disk)
2374 cpu->offset = le64_to_cpu(disk->offset);
2375 cpu->type = disk->type;
2376 cpu->objectid = le64_to_cpu(disk->objectid);
2379 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk,
2380 struct btrfs_key *cpu)
2382 disk->offset = cpu_to_le64(cpu->offset);
2383 disk->type = cpu->type;
2384 disk->objectid = cpu_to_le64(cpu->objectid);
2387 static inline void btrfs_node_key_to_cpu(struct extent_buffer *eb,
2388 struct btrfs_key *key, int nr)
2390 struct btrfs_disk_key disk_key;
2391 btrfs_node_key(eb, &disk_key, nr);
2392 btrfs_disk_key_to_cpu(key, &disk_key);
2395 static inline void btrfs_item_key_to_cpu(struct extent_buffer *eb,
2396 struct btrfs_key *key, int nr)
2398 struct btrfs_disk_key disk_key;
2399 btrfs_item_key(eb, &disk_key, nr);
2400 btrfs_disk_key_to_cpu(key, &disk_key);
2403 static inline void btrfs_dir_item_key_to_cpu(struct extent_buffer *eb,
2404 struct btrfs_dir_item *item,
2405 struct btrfs_key *key)
2407 struct btrfs_disk_key disk_key;
2408 btrfs_dir_item_key(eb, item, &disk_key);
2409 btrfs_disk_key_to_cpu(key, &disk_key);
2413 static inline u8 btrfs_key_type(struct btrfs_key *key)
2418 static inline void btrfs_set_key_type(struct btrfs_key *key, u8 val)
2423 /* struct btrfs_header */
2424 BTRFS_SETGET_HEADER_FUNCS(header_bytenr, struct btrfs_header, bytenr, 64);
2425 BTRFS_SETGET_HEADER_FUNCS(header_generation, struct btrfs_header,
2427 BTRFS_SETGET_HEADER_FUNCS(header_owner, struct btrfs_header, owner, 64);
2428 BTRFS_SETGET_HEADER_FUNCS(header_nritems, struct btrfs_header, nritems, 32);
2429 BTRFS_SETGET_HEADER_FUNCS(header_flags, struct btrfs_header, flags, 64);
2430 BTRFS_SETGET_HEADER_FUNCS(header_level, struct btrfs_header, level, 8);
2432 static inline int btrfs_header_flag(struct extent_buffer *eb, u64 flag)
2434 return (btrfs_header_flags(eb) & flag) == flag;
2437 static inline int btrfs_set_header_flag(struct extent_buffer *eb, u64 flag)
2439 u64 flags = btrfs_header_flags(eb);
2440 btrfs_set_header_flags(eb, flags | flag);
2441 return (flags & flag) == flag;
2444 static inline int btrfs_clear_header_flag(struct extent_buffer *eb, u64 flag)
2446 u64 flags = btrfs_header_flags(eb);
2447 btrfs_set_header_flags(eb, flags & ~flag);
2448 return (flags & flag) == flag;
2451 static inline int btrfs_header_backref_rev(struct extent_buffer *eb)
2453 u64 flags = btrfs_header_flags(eb);
2454 return flags >> BTRFS_BACKREF_REV_SHIFT;
2457 static inline void btrfs_set_header_backref_rev(struct extent_buffer *eb,
2460 u64 flags = btrfs_header_flags(eb);
2461 flags &= ~BTRFS_BACKREF_REV_MASK;
2462 flags |= (u64)rev << BTRFS_BACKREF_REV_SHIFT;
2463 btrfs_set_header_flags(eb, flags);
2466 static inline u8 *btrfs_header_fsid(struct extent_buffer *eb)
2468 unsigned long ptr = offsetof(struct btrfs_header, fsid);
2472 static inline u8 *btrfs_header_chunk_tree_uuid(struct extent_buffer *eb)
2474 unsigned long ptr = offsetof(struct btrfs_header, chunk_tree_uuid);
2478 static inline int btrfs_is_leaf(struct extent_buffer *eb)
2480 return btrfs_header_level(eb) == 0;
2483 /* struct btrfs_root_item */
2484 BTRFS_SETGET_FUNCS(disk_root_generation, struct btrfs_root_item,
2486 BTRFS_SETGET_FUNCS(disk_root_refs, struct btrfs_root_item, refs, 32);
2487 BTRFS_SETGET_FUNCS(disk_root_bytenr, struct btrfs_root_item, bytenr, 64);
2488 BTRFS_SETGET_FUNCS(disk_root_level, struct btrfs_root_item, level, 8);
2490 BTRFS_SETGET_STACK_FUNCS(root_generation, struct btrfs_root_item,
2492 BTRFS_SETGET_STACK_FUNCS(root_bytenr, struct btrfs_root_item, bytenr, 64);
2493 BTRFS_SETGET_STACK_FUNCS(root_level, struct btrfs_root_item, level, 8);
2494 BTRFS_SETGET_STACK_FUNCS(root_dirid, struct btrfs_root_item, root_dirid, 64);
2495 BTRFS_SETGET_STACK_FUNCS(root_refs, struct btrfs_root_item, refs, 32);
2496 BTRFS_SETGET_STACK_FUNCS(root_flags, struct btrfs_root_item, flags, 64);
2497 BTRFS_SETGET_STACK_FUNCS(root_used, struct btrfs_root_item, bytes_used, 64);
2498 BTRFS_SETGET_STACK_FUNCS(root_limit, struct btrfs_root_item, byte_limit, 64);
2499 BTRFS_SETGET_STACK_FUNCS(root_last_snapshot, struct btrfs_root_item,
2501 BTRFS_SETGET_STACK_FUNCS(root_generation_v2, struct btrfs_root_item,
2503 BTRFS_SETGET_STACK_FUNCS(root_ctransid, struct btrfs_root_item,
2505 BTRFS_SETGET_STACK_FUNCS(root_otransid, struct btrfs_root_item,
2507 BTRFS_SETGET_STACK_FUNCS(root_stransid, struct btrfs_root_item,
2509 BTRFS_SETGET_STACK_FUNCS(root_rtransid, struct btrfs_root_item,
2512 static inline bool btrfs_root_readonly(struct btrfs_root *root)
2514 return (root->root_item.flags & cpu_to_le64(BTRFS_ROOT_SUBVOL_RDONLY)) != 0;
2517 /* struct btrfs_root_backup */
2518 BTRFS_SETGET_STACK_FUNCS(backup_tree_root, struct btrfs_root_backup,
2520 BTRFS_SETGET_STACK_FUNCS(backup_tree_root_gen, struct btrfs_root_backup,
2522 BTRFS_SETGET_STACK_FUNCS(backup_tree_root_level, struct btrfs_root_backup,
2523 tree_root_level, 8);
2525 BTRFS_SETGET_STACK_FUNCS(backup_chunk_root, struct btrfs_root_backup,
2527 BTRFS_SETGET_STACK_FUNCS(backup_chunk_root_gen, struct btrfs_root_backup,
2528 chunk_root_gen, 64);
2529 BTRFS_SETGET_STACK_FUNCS(backup_chunk_root_level, struct btrfs_root_backup,
2530 chunk_root_level, 8);
2532 BTRFS_SETGET_STACK_FUNCS(backup_extent_root, struct btrfs_root_backup,
2534 BTRFS_SETGET_STACK_FUNCS(backup_extent_root_gen, struct btrfs_root_backup,
2535 extent_root_gen, 64);
2536 BTRFS_SETGET_STACK_FUNCS(backup_extent_root_level, struct btrfs_root_backup,
2537 extent_root_level, 8);
2539 BTRFS_SETGET_STACK_FUNCS(backup_fs_root, struct btrfs_root_backup,
2541 BTRFS_SETGET_STACK_FUNCS(backup_fs_root_gen, struct btrfs_root_backup,
2543 BTRFS_SETGET_STACK_FUNCS(backup_fs_root_level, struct btrfs_root_backup,
2546 BTRFS_SETGET_STACK_FUNCS(backup_dev_root, struct btrfs_root_backup,
2548 BTRFS_SETGET_STACK_FUNCS(backup_dev_root_gen, struct btrfs_root_backup,
2550 BTRFS_SETGET_STACK_FUNCS(backup_dev_root_level, struct btrfs_root_backup,
2553 BTRFS_SETGET_STACK_FUNCS(backup_csum_root, struct btrfs_root_backup,
2555 BTRFS_SETGET_STACK_FUNCS(backup_csum_root_gen, struct btrfs_root_backup,
2557 BTRFS_SETGET_STACK_FUNCS(backup_csum_root_level, struct btrfs_root_backup,
2558 csum_root_level, 8);
2559 BTRFS_SETGET_STACK_FUNCS(backup_total_bytes, struct btrfs_root_backup,
2561 BTRFS_SETGET_STACK_FUNCS(backup_bytes_used, struct btrfs_root_backup,
2563 BTRFS_SETGET_STACK_FUNCS(backup_num_devices, struct btrfs_root_backup,
2566 /* struct btrfs_balance_item */
2567 BTRFS_SETGET_FUNCS(balance_flags, struct btrfs_balance_item, flags, 64);
2569 static inline void btrfs_balance_data(struct extent_buffer *eb,
2570 struct btrfs_balance_item *bi,
2571 struct btrfs_disk_balance_args *ba)
2573 read_eb_member(eb, bi, struct btrfs_balance_item, data, ba);
2576 static inline void btrfs_set_balance_data(struct extent_buffer *eb,
2577 struct btrfs_balance_item *bi,
2578 struct btrfs_disk_balance_args *ba)
2580 write_eb_member(eb, bi, struct btrfs_balance_item, data, ba);
2583 static inline void btrfs_balance_meta(struct extent_buffer *eb,
2584 struct btrfs_balance_item *bi,
2585 struct btrfs_disk_balance_args *ba)
2587 read_eb_member(eb, bi, struct btrfs_balance_item, meta, ba);
2590 static inline void btrfs_set_balance_meta(struct extent_buffer *eb,
2591 struct btrfs_balance_item *bi,
2592 struct btrfs_disk_balance_args *ba)
2594 write_eb_member(eb, bi, struct btrfs_balance_item, meta, ba);
2597 static inline void btrfs_balance_sys(struct extent_buffer *eb,
2598 struct btrfs_balance_item *bi,
2599 struct btrfs_disk_balance_args *ba)
2601 read_eb_member(eb, bi, struct btrfs_balance_item, sys, ba);
2604 static inline void btrfs_set_balance_sys(struct extent_buffer *eb,
2605 struct btrfs_balance_item *bi,
2606 struct btrfs_disk_balance_args *ba)
2608 write_eb_member(eb, bi, struct btrfs_balance_item, sys, ba);
2612 btrfs_disk_balance_args_to_cpu(struct btrfs_balance_args *cpu,
2613 struct btrfs_disk_balance_args *disk)
2615 memset(cpu, 0, sizeof(*cpu));
2617 cpu->profiles = le64_to_cpu(disk->profiles);
2618 cpu->usage = le64_to_cpu(disk->usage);
2619 cpu->devid = le64_to_cpu(disk->devid);
2620 cpu->pstart = le64_to_cpu(disk->pstart);
2621 cpu->pend = le64_to_cpu(disk->pend);
2622 cpu->vstart = le64_to_cpu(disk->vstart);
2623 cpu->vend = le64_to_cpu(disk->vend);
2624 cpu->target = le64_to_cpu(disk->target);
2625 cpu->flags = le64_to_cpu(disk->flags);
2629 btrfs_cpu_balance_args_to_disk(struct btrfs_disk_balance_args *disk,
2630 struct btrfs_balance_args *cpu)
2632 memset(disk, 0, sizeof(*disk));
2634 disk->profiles = cpu_to_le64(cpu->profiles);
2635 disk->usage = cpu_to_le64(cpu->usage);
2636 disk->devid = cpu_to_le64(cpu->devid);
2637 disk->pstart = cpu_to_le64(cpu->pstart);
2638 disk->pend = cpu_to_le64(cpu->pend);
2639 disk->vstart = cpu_to_le64(cpu->vstart);
2640 disk->vend = cpu_to_le64(cpu->vend);
2641 disk->target = cpu_to_le64(cpu->target);
2642 disk->flags = cpu_to_le64(cpu->flags);
2645 /* struct btrfs_super_block */
2646 BTRFS_SETGET_STACK_FUNCS(super_bytenr, struct btrfs_super_block, bytenr, 64);
2647 BTRFS_SETGET_STACK_FUNCS(super_flags, struct btrfs_super_block, flags, 64);
2648 BTRFS_SETGET_STACK_FUNCS(super_generation, struct btrfs_super_block,
2650 BTRFS_SETGET_STACK_FUNCS(super_root, struct btrfs_super_block, root, 64);
2651 BTRFS_SETGET_STACK_FUNCS(super_sys_array_size,
2652 struct btrfs_super_block, sys_chunk_array_size, 32);
2653 BTRFS_SETGET_STACK_FUNCS(super_chunk_root_generation,
2654 struct btrfs_super_block, chunk_root_generation, 64);
2655 BTRFS_SETGET_STACK_FUNCS(super_root_level, struct btrfs_super_block,
2657 BTRFS_SETGET_STACK_FUNCS(super_chunk_root, struct btrfs_super_block,
2659 BTRFS_SETGET_STACK_FUNCS(super_chunk_root_level, struct btrfs_super_block,
2660 chunk_root_level, 8);
2661 BTRFS_SETGET_STACK_FUNCS(super_log_root, struct btrfs_super_block,
2663 BTRFS_SETGET_STACK_FUNCS(super_log_root_transid, struct btrfs_super_block,
2664 log_root_transid, 64);
2665 BTRFS_SETGET_STACK_FUNCS(super_log_root_level, struct btrfs_super_block,
2667 BTRFS_SETGET_STACK_FUNCS(super_total_bytes, struct btrfs_super_block,
2669 BTRFS_SETGET_STACK_FUNCS(super_bytes_used, struct btrfs_super_block,
2671 BTRFS_SETGET_STACK_FUNCS(super_sectorsize, struct btrfs_super_block,
2673 BTRFS_SETGET_STACK_FUNCS(super_nodesize, struct btrfs_super_block,
2675 BTRFS_SETGET_STACK_FUNCS(super_leafsize, struct btrfs_super_block,
2677 BTRFS_SETGET_STACK_FUNCS(super_stripesize, struct btrfs_super_block,
2679 BTRFS_SETGET_STACK_FUNCS(super_root_dir, struct btrfs_super_block,
2680 root_dir_objectid, 64);
2681 BTRFS_SETGET_STACK_FUNCS(super_num_devices, struct btrfs_super_block,
2683 BTRFS_SETGET_STACK_FUNCS(super_compat_flags, struct btrfs_super_block,
2685 BTRFS_SETGET_STACK_FUNCS(super_compat_ro_flags, struct btrfs_super_block,
2686 compat_ro_flags, 64);
2687 BTRFS_SETGET_STACK_FUNCS(super_incompat_flags, struct btrfs_super_block,
2688 incompat_flags, 64);
2689 BTRFS_SETGET_STACK_FUNCS(super_csum_type, struct btrfs_super_block,
2691 BTRFS_SETGET_STACK_FUNCS(super_cache_generation, struct btrfs_super_block,
2692 cache_generation, 64);
2694 static inline int btrfs_super_csum_size(struct btrfs_super_block *s)
2696 int t = btrfs_super_csum_type(s);
2697 BUG_ON(t >= ARRAY_SIZE(btrfs_csum_sizes));
2698 return btrfs_csum_sizes[t];
2701 static inline unsigned long btrfs_leaf_data(struct extent_buffer *l)
2703 return offsetof(struct btrfs_leaf, items);
2706 /* struct btrfs_file_extent_item */
2707 BTRFS_SETGET_FUNCS(file_extent_type, struct btrfs_file_extent_item, type, 8);
2709 static inline unsigned long
2710 btrfs_file_extent_inline_start(struct btrfs_file_extent_item *e)
2712 unsigned long offset = (unsigned long)e;
2713 offset += offsetof(struct btrfs_file_extent_item, disk_bytenr);
2717 static inline u32 btrfs_file_extent_calc_inline_size(u32 datasize)
2719 return offsetof(struct btrfs_file_extent_item, disk_bytenr) + datasize;
2722 BTRFS_SETGET_FUNCS(file_extent_disk_bytenr, struct btrfs_file_extent_item,
2724 BTRFS_SETGET_FUNCS(file_extent_generation, struct btrfs_file_extent_item,
2726 BTRFS_SETGET_FUNCS(file_extent_disk_num_bytes, struct btrfs_file_extent_item,
2727 disk_num_bytes, 64);
2728 BTRFS_SETGET_FUNCS(file_extent_offset, struct btrfs_file_extent_item,
2730 BTRFS_SETGET_FUNCS(file_extent_num_bytes, struct btrfs_file_extent_item,
2732 BTRFS_SETGET_FUNCS(file_extent_ram_bytes, struct btrfs_file_extent_item,
2734 BTRFS_SETGET_FUNCS(file_extent_compression, struct btrfs_file_extent_item,
2736 BTRFS_SETGET_FUNCS(file_extent_encryption, struct btrfs_file_extent_item,
2738 BTRFS_SETGET_FUNCS(file_extent_other_encoding, struct btrfs_file_extent_item,
2739 other_encoding, 16);
2741 /* this returns the number of file bytes represented by the inline item.
2742 * If an item is compressed, this is the uncompressed size
2744 static inline u32 btrfs_file_extent_inline_len(struct extent_buffer *eb,
2745 struct btrfs_file_extent_item *e)
2747 return btrfs_file_extent_ram_bytes(eb, e);
2751 * this returns the number of bytes used by the item on disk, minus the
2752 * size of any extent headers. If a file is compressed on disk, this is
2753 * the compressed size
2755 static inline u32 btrfs_file_extent_inline_item_len(struct extent_buffer *eb,
2756 struct btrfs_item *e)
2758 unsigned long offset;
2759 offset = offsetof(struct btrfs_file_extent_item, disk_bytenr);
2760 return btrfs_item_size(eb, e) - offset;
2763 /* btrfs_dev_stats_item */
2764 static inline u64 btrfs_dev_stats_value(struct extent_buffer *eb,
2765 struct btrfs_dev_stats_item *ptr,
2770 read_extent_buffer(eb, &val,
2771 offsetof(struct btrfs_dev_stats_item, values) +
2772 ((unsigned long)ptr) + (index * sizeof(u64)),
2777 static inline void btrfs_set_dev_stats_value(struct extent_buffer *eb,
2778 struct btrfs_dev_stats_item *ptr,
2781 write_extent_buffer(eb, &val,
2782 offsetof(struct btrfs_dev_stats_item, values) +
2783 ((unsigned long)ptr) + (index * sizeof(u64)),
2787 /* btrfs_qgroup_status_item */
2788 BTRFS_SETGET_FUNCS(qgroup_status_generation, struct btrfs_qgroup_status_item,
2790 BTRFS_SETGET_FUNCS(qgroup_status_version, struct btrfs_qgroup_status_item,
2792 BTRFS_SETGET_FUNCS(qgroup_status_flags, struct btrfs_qgroup_status_item,
2794 BTRFS_SETGET_FUNCS(qgroup_status_scan, struct btrfs_qgroup_status_item,
2797 /* btrfs_qgroup_info_item */
2798 BTRFS_SETGET_FUNCS(qgroup_info_generation, struct btrfs_qgroup_info_item,
2800 BTRFS_SETGET_FUNCS(qgroup_info_rfer, struct btrfs_qgroup_info_item, rfer, 64);
2801 BTRFS_SETGET_FUNCS(qgroup_info_rfer_cmpr, struct btrfs_qgroup_info_item,
2803 BTRFS_SETGET_FUNCS(qgroup_info_excl, struct btrfs_qgroup_info_item, excl, 64);
2804 BTRFS_SETGET_FUNCS(qgroup_info_excl_cmpr, struct btrfs_qgroup_info_item,
2807 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_generation,
2808 struct btrfs_qgroup_info_item, generation, 64);
2809 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_rfer, struct btrfs_qgroup_info_item,
2811 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_rfer_cmpr,
2812 struct btrfs_qgroup_info_item, rfer_cmpr, 64);
2813 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_excl, struct btrfs_qgroup_info_item,
2815 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_excl_cmpr,
2816 struct btrfs_qgroup_info_item, excl_cmpr, 64);
2818 /* btrfs_qgroup_limit_item */
2819 BTRFS_SETGET_FUNCS(qgroup_limit_flags, struct btrfs_qgroup_limit_item,
2821 BTRFS_SETGET_FUNCS(qgroup_limit_max_rfer, struct btrfs_qgroup_limit_item,
2823 BTRFS_SETGET_FUNCS(qgroup_limit_max_excl, struct btrfs_qgroup_limit_item,
2825 BTRFS_SETGET_FUNCS(qgroup_limit_rsv_rfer, struct btrfs_qgroup_limit_item,
2827 BTRFS_SETGET_FUNCS(qgroup_limit_rsv_excl, struct btrfs_qgroup_limit_item,
2830 /* btrfs_dev_replace_item */
2831 BTRFS_SETGET_FUNCS(dev_replace_src_devid,
2832 struct btrfs_dev_replace_item, src_devid, 64);
2833 BTRFS_SETGET_FUNCS(dev_replace_cont_reading_from_srcdev_mode,
2834 struct btrfs_dev_replace_item, cont_reading_from_srcdev_mode,
2836 BTRFS_SETGET_FUNCS(dev_replace_replace_state, struct btrfs_dev_replace_item,
2838 BTRFS_SETGET_FUNCS(dev_replace_time_started, struct btrfs_dev_replace_item,
2840 BTRFS_SETGET_FUNCS(dev_replace_time_stopped, struct btrfs_dev_replace_item,
2842 BTRFS_SETGET_FUNCS(dev_replace_num_write_errors, struct btrfs_dev_replace_item,
2843 num_write_errors, 64);
2844 BTRFS_SETGET_FUNCS(dev_replace_num_uncorrectable_read_errors,
2845 struct btrfs_dev_replace_item, num_uncorrectable_read_errors,
2847 BTRFS_SETGET_FUNCS(dev_replace_cursor_left, struct btrfs_dev_replace_item,
2849 BTRFS_SETGET_FUNCS(dev_replace_cursor_right, struct btrfs_dev_replace_item,
2852 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_src_devid,
2853 struct btrfs_dev_replace_item, src_devid, 64);
2854 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_cont_reading_from_srcdev_mode,
2855 struct btrfs_dev_replace_item,
2856 cont_reading_from_srcdev_mode, 64);
2857 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_replace_state,
2858 struct btrfs_dev_replace_item, replace_state, 64);
2859 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_time_started,
2860 struct btrfs_dev_replace_item, time_started, 64);
2861 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_time_stopped,
2862 struct btrfs_dev_replace_item, time_stopped, 64);
2863 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_num_write_errors,
2864 struct btrfs_dev_replace_item, num_write_errors, 64);
2865 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_num_uncorrectable_read_errors,
2866 struct btrfs_dev_replace_item,
2867 num_uncorrectable_read_errors, 64);
2868 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_cursor_left,
2869 struct btrfs_dev_replace_item, cursor_left, 64);
2870 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_cursor_right,
2871 struct btrfs_dev_replace_item, cursor_right, 64);
2873 static inline struct btrfs_fs_info *btrfs_sb(struct super_block *sb)
2875 return sb->s_fs_info;
2878 static inline u32 btrfs_level_size(struct btrfs_root *root, int level)
2881 return root->leafsize;
2882 return root->nodesize;
2885 /* helper function to cast into the data area of the leaf. */
2886 #define btrfs_item_ptr(leaf, slot, type) \
2887 ((type *)(btrfs_leaf_data(leaf) + \
2888 btrfs_item_offset_nr(leaf, slot)))
2890 #define btrfs_item_ptr_offset(leaf, slot) \
2891 ((unsigned long)(btrfs_leaf_data(leaf) + \
2892 btrfs_item_offset_nr(leaf, slot)))
2894 static inline struct dentry *fdentry(struct file *file)
2896 return file->f_path.dentry;
2899 static inline bool btrfs_mixed_space_info(struct btrfs_space_info *space_info)
2901 return ((space_info->flags & BTRFS_BLOCK_GROUP_METADATA) &&
2902 (space_info->flags & BTRFS_BLOCK_GROUP_DATA));
2905 static inline gfp_t btrfs_alloc_write_mask(struct address_space *mapping)
2907 return mapping_gfp_mask(mapping) & ~__GFP_FS;
2911 static inline u64 btrfs_calc_trans_metadata_size(struct btrfs_root *root,
2914 return (root->leafsize + root->nodesize * (BTRFS_MAX_LEVEL - 1)) *
2919 * Doing a truncate won't result in new nodes or leaves, just what we need for
2922 static inline u64 btrfs_calc_trunc_metadata_size(struct btrfs_root *root,
2925 return (root->leafsize + root->nodesize * (BTRFS_MAX_LEVEL - 1)) *
2929 void btrfs_put_block_group(struct btrfs_block_group_cache *cache);
2930 int btrfs_run_delayed_refs(struct btrfs_trans_handle *trans,
2931 struct btrfs_root *root, unsigned long count);
2932 int btrfs_lookup_extent(struct btrfs_root *root, u64 start, u64 len);
2933 int btrfs_lookup_extent_info(struct btrfs_trans_handle *trans,
2934 struct btrfs_root *root, u64 bytenr,
2935 u64 num_bytes, u64 *refs, u64 *flags);
2936 int btrfs_pin_extent(struct btrfs_root *root,
2937 u64 bytenr, u64 num, int reserved);
2938 int btrfs_pin_extent_for_log_replay(struct btrfs_trans_handle *trans,
2939 struct btrfs_root *root,
2940 u64 bytenr, u64 num_bytes);
2941 int btrfs_cross_ref_exist(struct btrfs_trans_handle *trans,
2942 struct btrfs_root *root,
2943 u64 objectid, u64 offset, u64 bytenr);
2944 struct btrfs_block_group_cache *btrfs_lookup_block_group(
2945 struct btrfs_fs_info *info,
2947 void btrfs_put_block_group(struct btrfs_block_group_cache *cache);
2948 u64 btrfs_find_block_group(struct btrfs_root *root,
2949 u64 search_start, u64 search_hint, int owner);
2950 struct extent_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
2951 struct btrfs_root *root, u32 blocksize,
2952 u64 parent, u64 root_objectid,
2953 struct btrfs_disk_key *key, int level,
2954 u64 hint, u64 empty_size);
2955 void btrfs_free_tree_block(struct btrfs_trans_handle *trans,
2956 struct btrfs_root *root,
2957 struct extent_buffer *buf,
2958 u64 parent, int last_ref);
2959 struct extent_buffer *btrfs_init_new_buffer(struct btrfs_trans_handle *trans,
2960 struct btrfs_root *root,
2961 u64 bytenr, u32 blocksize,
2963 int btrfs_alloc_reserved_file_extent(struct btrfs_trans_handle *trans,
2964 struct btrfs_root *root,
2965 u64 root_objectid, u64 owner,
2966 u64 offset, struct btrfs_key *ins);
2967 int btrfs_alloc_logged_file_extent(struct btrfs_trans_handle *trans,
2968 struct btrfs_root *root,
2969 u64 root_objectid, u64 owner, u64 offset,
2970 struct btrfs_key *ins);
2971 int btrfs_reserve_extent(struct btrfs_trans_handle *trans,
2972 struct btrfs_root *root,
2973 u64 num_bytes, u64 min_alloc_size,
2974 u64 empty_size, u64 hint_byte,
2975 struct btrfs_key *ins, u64 data);
2976 int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2977 struct extent_buffer *buf, int full_backref, int for_cow);
2978 int btrfs_dec_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2979 struct extent_buffer *buf, int full_backref, int for_cow);
2980 int btrfs_set_disk_extent_flags(struct btrfs_trans_handle *trans,
2981 struct btrfs_root *root,
2982 u64 bytenr, u64 num_bytes, u64 flags,
2984 int btrfs_free_extent(struct btrfs_trans_handle *trans,
2985 struct btrfs_root *root,
2986 u64 bytenr, u64 num_bytes, u64 parent, u64 root_objectid,
2987 u64 owner, u64 offset, int for_cow);
2989 int btrfs_free_reserved_extent(struct btrfs_root *root, u64 start, u64 len);
2990 int btrfs_free_and_pin_reserved_extent(struct btrfs_root *root,
2991 u64 start, u64 len);
2992 void btrfs_prepare_extent_commit(struct btrfs_trans_handle *trans,
2993 struct btrfs_root *root);
2994 int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans,
2995 struct btrfs_root *root);
2996 int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
2997 struct btrfs_root *root,
2998 u64 bytenr, u64 num_bytes, u64 parent,
2999 u64 root_objectid, u64 owner, u64 offset, int for_cow);
3001 int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans,
3002 struct btrfs_root *root);
3003 int btrfs_extent_readonly(struct btrfs_root *root, u64 bytenr);
3004 int btrfs_free_block_groups(struct btrfs_fs_info *info);
3005 int btrfs_read_block_groups(struct btrfs_root *root);
3006 int btrfs_can_relocate(struct btrfs_root *root, u64 bytenr);
3007 int btrfs_make_block_group(struct btrfs_trans_handle *trans,
3008 struct btrfs_root *root, u64 bytes_used,
3009 u64 type, u64 chunk_objectid, u64 chunk_offset,
3011 int btrfs_remove_block_group(struct btrfs_trans_handle *trans,
3012 struct btrfs_root *root, u64 group_start);
3013 void btrfs_create_pending_block_groups(struct btrfs_trans_handle *trans,
3014 struct btrfs_root *root);
3015 u64 btrfs_reduce_alloc_profile(struct btrfs_root *root, u64 flags);
3016 u64 btrfs_get_alloc_profile(struct btrfs_root *root, int data);
3017 void btrfs_clear_space_info_full(struct btrfs_fs_info *info);
3019 enum btrfs_reserve_flush_enum {
3020 /* If we are in the transaction, we can't flush anything.*/
3021 BTRFS_RESERVE_NO_FLUSH,
3023 * Flushing delalloc may cause deadlock somewhere, in this
3024 * case, use FLUSH LIMIT
3026 BTRFS_RESERVE_FLUSH_LIMIT,
3027 BTRFS_RESERVE_FLUSH_ALL,
3030 int btrfs_check_data_free_space(struct inode *inode, u64 bytes);
3031 void btrfs_free_reserved_data_space(struct inode *inode, u64 bytes);
3032 void btrfs_trans_release_metadata(struct btrfs_trans_handle *trans,
3033 struct btrfs_root *root);
3034 int btrfs_orphan_reserve_metadata(struct btrfs_trans_handle *trans,
3035 struct inode *inode);
3036 void btrfs_orphan_release_metadata(struct inode *inode);
3037 int btrfs_snap_reserve_metadata(struct btrfs_trans_handle *trans,
3038 struct btrfs_pending_snapshot *pending);
3039 int btrfs_delalloc_reserve_metadata(struct inode *inode, u64 num_bytes);
3040 void btrfs_delalloc_release_metadata(struct inode *inode, u64 num_bytes);
3041 int btrfs_delalloc_reserve_space(struct inode *inode, u64 num_bytes);
3042 void btrfs_delalloc_release_space(struct inode *inode, u64 num_bytes);
3043 void btrfs_init_block_rsv(struct btrfs_block_rsv *rsv, unsigned short type);
3044 struct btrfs_block_rsv *btrfs_alloc_block_rsv(struct btrfs_root *root,
3045 unsigned short type);
3046 void btrfs_free_block_rsv(struct btrfs_root *root,
3047 struct btrfs_block_rsv *rsv);
3048 int btrfs_block_rsv_add(struct btrfs_root *root,
3049 struct btrfs_block_rsv *block_rsv, u64 num_bytes,
3050 enum btrfs_reserve_flush_enum flush);
3051 int btrfs_block_rsv_check(struct btrfs_root *root,
3052 struct btrfs_block_rsv *block_rsv, int min_factor);
3053 int btrfs_block_rsv_refill(struct btrfs_root *root,
3054 struct btrfs_block_rsv *block_rsv, u64 min_reserved,
3055 enum btrfs_reserve_flush_enum flush);
3056 int btrfs_block_rsv_migrate(struct btrfs_block_rsv *src_rsv,
3057 struct btrfs_block_rsv *dst_rsv,
3059 void btrfs_block_rsv_release(struct btrfs_root *root,
3060 struct btrfs_block_rsv *block_rsv,
3062 int btrfs_set_block_group_ro(struct btrfs_root *root,
3063 struct btrfs_block_group_cache *cache);
3064 void btrfs_set_block_group_rw(struct btrfs_root *root,
3065 struct btrfs_block_group_cache *cache);
3066 void btrfs_put_block_group_cache(struct btrfs_fs_info *info);
3067 u64 btrfs_account_ro_block_groups_free_space(struct btrfs_space_info *sinfo);
3068 int btrfs_error_unpin_extent_range(struct btrfs_root *root,
3069 u64 start, u64 end);
3070 int btrfs_error_discard_extent(struct btrfs_root *root, u64 bytenr,
3071 u64 num_bytes, u64 *actual_bytes);
3072 int btrfs_force_chunk_alloc(struct btrfs_trans_handle *trans,
3073 struct btrfs_root *root, u64 type);
3074 int btrfs_trim_fs(struct btrfs_root *root, struct fstrim_range *range);
3076 int btrfs_init_space_info(struct btrfs_fs_info *fs_info);
3077 int btrfs_delayed_refs_qgroup_accounting(struct btrfs_trans_handle *trans,
3078 struct btrfs_fs_info *fs_info);
3080 int btrfs_bin_search(struct extent_buffer *eb, struct btrfs_key *key,
3081 int level, int *slot);
3082 int btrfs_comp_cpu_keys(struct btrfs_key *k1, struct btrfs_key *k2);
3083 int btrfs_previous_item(struct btrfs_root *root,
3084 struct btrfs_path *path, u64 min_objectid,
3086 void btrfs_set_item_key_safe(struct btrfs_trans_handle *trans,
3087 struct btrfs_root *root, struct btrfs_path *path,
3088 struct btrfs_key *new_key);
3089 struct extent_buffer *btrfs_root_node(struct btrfs_root *root);
3090 struct extent_buffer *btrfs_lock_root_node(struct btrfs_root *root);
3091 int btrfs_find_next_key(struct btrfs_root *root, struct btrfs_path *path,
3092 struct btrfs_key *key, int lowest_level,
3093 int cache_only, u64 min_trans);
3094 int btrfs_search_forward(struct btrfs_root *root, struct btrfs_key *min_key,
3095 struct btrfs_key *max_key,
3096 struct btrfs_path *path, int cache_only,
3098 enum btrfs_compare_tree_result {
3099 BTRFS_COMPARE_TREE_NEW,
3100 BTRFS_COMPARE_TREE_DELETED,
3101 BTRFS_COMPARE_TREE_CHANGED,
3103 typedef int (*btrfs_changed_cb_t)(struct btrfs_root *left_root,
3104 struct btrfs_root *right_root,
3105 struct btrfs_path *left_path,
3106 struct btrfs_path *right_path,
3107 struct btrfs_key *key,
3108 enum btrfs_compare_tree_result result,
3110 int btrfs_compare_trees(struct btrfs_root *left_root,
3111 struct btrfs_root *right_root,
3112 btrfs_changed_cb_t cb, void *ctx);
3113 int btrfs_cow_block(struct btrfs_trans_handle *trans,
3114 struct btrfs_root *root, struct extent_buffer *buf,
3115 struct extent_buffer *parent, int parent_slot,
3116 struct extent_buffer **cow_ret);
3117 int btrfs_copy_root(struct btrfs_trans_handle *trans,
3118 struct btrfs_root *root,
3119 struct extent_buffer *buf,
3120 struct extent_buffer **cow_ret, u64 new_root_objectid);
3121 int btrfs_block_can_be_shared(struct btrfs_root *root,
3122 struct extent_buffer *buf);
3123 void btrfs_extend_item(struct btrfs_trans_handle *trans,
3124 struct btrfs_root *root, struct btrfs_path *path,
3126 void btrfs_truncate_item(struct btrfs_trans_handle *trans,
3127 struct btrfs_root *root,
3128 struct btrfs_path *path,
3129 u32 new_size, int from_end);
3130 int btrfs_split_item(struct btrfs_trans_handle *trans,
3131 struct btrfs_root *root,
3132 struct btrfs_path *path,
3133 struct btrfs_key *new_key,
3134 unsigned long split_offset);
3135 int btrfs_duplicate_item(struct btrfs_trans_handle *trans,
3136 struct btrfs_root *root,
3137 struct btrfs_path *path,
3138 struct btrfs_key *new_key);
3139 int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root
3140 *root, struct btrfs_key *key, struct btrfs_path *p, int
3142 int btrfs_search_old_slot(struct btrfs_root *root, struct btrfs_key *key,
3143 struct btrfs_path *p, u64 time_seq);
3144 int btrfs_search_slot_for_read(struct btrfs_root *root,
3145 struct btrfs_key *key, struct btrfs_path *p,
3146 int find_higher, int return_any);
3147 int btrfs_realloc_node(struct btrfs_trans_handle *trans,
3148 struct btrfs_root *root, struct extent_buffer *parent,
3149 int start_slot, int cache_only, u64 *last_ret,
3150 struct btrfs_key *progress);
3151 void btrfs_release_path(struct btrfs_path *p);
3152 struct btrfs_path *btrfs_alloc_path(void);
3153 void btrfs_free_path(struct btrfs_path *p);
3154 void btrfs_set_path_blocking(struct btrfs_path *p);
3155 void btrfs_clear_path_blocking(struct btrfs_path *p,
3156 struct extent_buffer *held, int held_rw);
3157 void btrfs_unlock_up_safe(struct btrfs_path *p, int level);
3159 int btrfs_del_items(struct btrfs_trans_handle *trans, struct btrfs_root *root,
3160 struct btrfs_path *path, int slot, int nr);
3161 static inline int btrfs_del_item(struct btrfs_trans_handle *trans,
3162 struct btrfs_root *root,
3163 struct btrfs_path *path)
3165 return btrfs_del_items(trans, root, path, path->slots[0], 1);
3168 void setup_items_for_insert(struct btrfs_trans_handle *trans,
3169 struct btrfs_root *root, struct btrfs_path *path,
3170 struct btrfs_key *cpu_key, u32 *data_size,
3171 u32 total_data, u32 total_size, int nr);
3172 int btrfs_insert_item(struct btrfs_trans_handle *trans, struct btrfs_root
3173 *root, struct btrfs_key *key, void *data, u32 data_size);
3174 int btrfs_insert_empty_items(struct btrfs_trans_handle *trans,
3175 struct btrfs_root *root,
3176 struct btrfs_path *path,
3177 struct btrfs_key *cpu_key, u32 *data_size, int nr);
3179 static inline int btrfs_insert_empty_item(struct btrfs_trans_handle *trans,
3180 struct btrfs_root *root,
3181 struct btrfs_path *path,
3182 struct btrfs_key *key,
3185 return btrfs_insert_empty_items(trans, root, path, key, &data_size, 1);
3188 int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path);
3189 int btrfs_next_old_leaf(struct btrfs_root *root, struct btrfs_path *path,
3191 static inline int btrfs_next_old_item(struct btrfs_root *root,
3192 struct btrfs_path *p, u64 time_seq)
3195 if (p->slots[0] >= btrfs_header_nritems(p->nodes[0]))
3196 return btrfs_next_old_leaf(root, p, time_seq);
3199 static inline int btrfs_next_item(struct btrfs_root *root, struct btrfs_path *p)
3201 return btrfs_next_old_item(root, p, 0);
3203 int btrfs_prev_leaf(struct btrfs_root *root, struct btrfs_path *path);
3204 int btrfs_leaf_free_space(struct btrfs_root *root, struct extent_buffer *leaf);
3205 int __must_check btrfs_drop_snapshot(struct btrfs_root *root,
3206 struct btrfs_block_rsv *block_rsv,
3207 int update_ref, int for_reloc);
3208 int btrfs_drop_subtree(struct btrfs_trans_handle *trans,
3209 struct btrfs_root *root,
3210 struct extent_buffer *node,
3211 struct extent_buffer *parent);
3212 static inline int btrfs_fs_closing(struct btrfs_fs_info *fs_info)
3215 * Get synced with close_ctree()
3218 return fs_info->closing;
3220 static inline void free_fs_info(struct btrfs_fs_info *fs_info)
3222 kfree(fs_info->balance_ctl);
3223 kfree(fs_info->delayed_root);
3224 kfree(fs_info->extent_root);
3225 kfree(fs_info->tree_root);
3226 kfree(fs_info->chunk_root);
3227 kfree(fs_info->dev_root);
3228 kfree(fs_info->csum_root);
3229 kfree(fs_info->quota_root);
3230 kfree(fs_info->super_copy);
3231 kfree(fs_info->super_for_commit);
3235 /* tree mod log functions from ctree.c */
3236 u64 btrfs_get_tree_mod_seq(struct btrfs_fs_info *fs_info,
3237 struct seq_list *elem);
3238 void btrfs_put_tree_mod_seq(struct btrfs_fs_info *fs_info,
3239 struct seq_list *elem);
3240 static inline u64 btrfs_inc_tree_mod_seq(struct btrfs_fs_info *fs_info)
3242 return atomic_inc_return(&fs_info->tree_mod_seq);
3244 int btrfs_old_root_level(struct btrfs_root *root, u64 time_seq);
3247 int btrfs_find_root_ref(struct btrfs_root *tree_root,
3248 struct btrfs_path *path,
3249 u64 root_id, u64 ref_id);
3250 int btrfs_add_root_ref(struct btrfs_trans_handle *trans,
3251 struct btrfs_root *tree_root,
3252 u64 root_id, u64 ref_id, u64 dirid, u64 sequence,
3253 const char *name, int name_len);
3254 int btrfs_del_root_ref(struct btrfs_trans_handle *trans,
3255 struct btrfs_root *tree_root,
3256 u64 root_id, u64 ref_id, u64 dirid, u64 *sequence,
3257 const char *name, int name_len);
3258 int btrfs_del_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
3259 struct btrfs_key *key);
3260 int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root
3261 *root, struct btrfs_key *key, struct btrfs_root_item
3263 int __must_check btrfs_update_root(struct btrfs_trans_handle *trans,
3264 struct btrfs_root *root,
3265 struct btrfs_key *key,
3266 struct btrfs_root_item *item);
3267 void btrfs_read_root_item(struct btrfs_root *root,
3268 struct extent_buffer *eb, int slot,
3269 struct btrfs_root_item *item);
3270 int btrfs_find_last_root(struct btrfs_root *root, u64 objectid, struct
3271 btrfs_root_item *item, struct btrfs_key *key);
3272 int btrfs_find_dead_roots(struct btrfs_root *root, u64 objectid);
3273 int btrfs_find_orphan_roots(struct btrfs_root *tree_root);
3274 void btrfs_set_root_node(struct btrfs_root_item *item,
3275 struct extent_buffer *node);
3276 void btrfs_check_and_init_root_item(struct btrfs_root_item *item);
3277 void btrfs_update_root_times(struct btrfs_trans_handle *trans,
3278 struct btrfs_root *root);
3281 int btrfs_insert_dir_item(struct btrfs_trans_handle *trans,
3282 struct btrfs_root *root, const char *name,
3283 int name_len, struct inode *dir,
3284 struct btrfs_key *location, u8 type, u64 index);
3285 struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans,
3286 struct btrfs_root *root,
3287 struct btrfs_path *path, u64 dir,
3288 const char *name, int name_len,
3290 struct btrfs_dir_item *
3291 btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans,
3292 struct btrfs_root *root,
3293 struct btrfs_path *path, u64 dir,
3294 u64 objectid, const char *name, int name_len,
3296 struct btrfs_dir_item *
3297 btrfs_search_dir_index_item(struct btrfs_root *root,
3298 struct btrfs_path *path, u64 dirid,
3299 const char *name, int name_len);
3300 struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_root *root,
3301 struct btrfs_path *path,
3302 const char *name, int name_len);
3303 int btrfs_delete_one_dir_name(struct btrfs_trans_handle *trans,
3304 struct btrfs_root *root,
3305 struct btrfs_path *path,
3306 struct btrfs_dir_item *di);
3307 int btrfs_insert_xattr_item(struct btrfs_trans_handle *trans,
3308 struct btrfs_root *root,
3309 struct btrfs_path *path, u64 objectid,
3310 const char *name, u16 name_len,
3311 const void *data, u16 data_len);
3312 struct btrfs_dir_item *btrfs_lookup_xattr(struct btrfs_trans_handle *trans,
3313 struct btrfs_root *root,
3314 struct btrfs_path *path, u64 dir,
3315 const char *name, u16 name_len,
3317 int verify_dir_item(struct btrfs_root *root,
3318 struct extent_buffer *leaf,
3319 struct btrfs_dir_item *dir_item);
3322 int btrfs_insert_orphan_item(struct btrfs_trans_handle *trans,
3323 struct btrfs_root *root, u64 offset);
3324 int btrfs_del_orphan_item(struct btrfs_trans_handle *trans,
3325 struct btrfs_root *root, u64 offset);
3326 int btrfs_find_orphan_item(struct btrfs_root *root, u64 offset);
3329 int btrfs_insert_inode_ref(struct btrfs_trans_handle *trans,
3330 struct btrfs_root *root,
3331 const char *name, int name_len,
3332 u64 inode_objectid, u64 ref_objectid, u64 index);
3333 int btrfs_del_inode_ref(struct btrfs_trans_handle *trans,
3334 struct btrfs_root *root,
3335 const char *name, int name_len,
3336 u64 inode_objectid, u64 ref_objectid, u64 *index);
3337 int btrfs_get_inode_ref_index(struct btrfs_trans_handle *trans,
3338 struct btrfs_root *root,
3339 struct btrfs_path *path,
3340 const char *name, int name_len,
3341 u64 inode_objectid, u64 ref_objectid, int mod,
3343 int btrfs_insert_empty_inode(struct btrfs_trans_handle *trans,
3344 struct btrfs_root *root,
3345 struct btrfs_path *path, u64 objectid);
3346 int btrfs_lookup_inode(struct btrfs_trans_handle *trans, struct btrfs_root
3347 *root, struct btrfs_path *path,
3348 struct btrfs_key *location, int mod);
3350 struct btrfs_inode_extref *
3351 btrfs_lookup_inode_extref(struct btrfs_trans_handle *trans,
3352 struct btrfs_root *root,
3353 struct btrfs_path *path,
3354 const char *name, int name_len,
3355 u64 inode_objectid, u64 ref_objectid, int ins_len,
3358 int btrfs_find_name_in_ext_backref(struct btrfs_path *path,
3359 u64 ref_objectid, const char *name,
3361 struct btrfs_inode_extref **extref_ret);
3364 int btrfs_del_csums(struct btrfs_trans_handle *trans,
3365 struct btrfs_root *root, u64 bytenr, u64 len);
3366 int btrfs_lookup_bio_sums(struct btrfs_root *root, struct inode *inode,
3367 struct bio *bio, u32 *dst);
3368 int btrfs_lookup_bio_sums_dio(struct btrfs_root *root, struct inode *inode,
3369 struct bio *bio, u64 logical_offset);
3370 int btrfs_insert_file_extent(struct btrfs_trans_handle *trans,
3371 struct btrfs_root *root,
3372 u64 objectid, u64 pos,
3373 u64 disk_offset, u64 disk_num_bytes,
3374 u64 num_bytes, u64 offset, u64 ram_bytes,
3375 u8 compression, u8 encryption, u16 other_encoding);
3376 int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
3377 struct btrfs_root *root,
3378 struct btrfs_path *path, u64 objectid,
3379 u64 bytenr, int mod);
3380 u64 btrfs_file_extent_length(struct btrfs_path *path);
3381 int btrfs_csum_file_blocks(struct btrfs_trans_handle *trans,
3382 struct btrfs_root *root,
3383 struct btrfs_ordered_sum *sums);
3384 int btrfs_csum_one_bio(struct btrfs_root *root, struct inode *inode,
3385 struct bio *bio, u64 file_start, int contig);
3386 struct btrfs_csum_item *btrfs_lookup_csum(struct btrfs_trans_handle *trans,
3387 struct btrfs_root *root,
3388 struct btrfs_path *path,
3389 u64 bytenr, int cow);
3390 int btrfs_csum_truncate(struct btrfs_trans_handle *trans,
3391 struct btrfs_root *root, struct btrfs_path *path,
3393 int btrfs_lookup_csums_range(struct btrfs_root *root, u64 start, u64 end,
3394 struct list_head *list, int search_commit);
3396 struct btrfs_delalloc_work {
3397 struct inode *inode;
3400 struct completion completion;
3401 struct list_head list;
3402 struct btrfs_work work;
3405 struct btrfs_delalloc_work *btrfs_alloc_delalloc_work(struct inode *inode,
3406 int wait, int delay_iput);
3407 void btrfs_wait_and_free_delalloc_work(struct btrfs_delalloc_work *work);
3409 struct extent_map *btrfs_get_extent_fiemap(struct inode *inode, struct page *page,
3410 size_t pg_offset, u64 start, u64 len,
3413 /* RHEL and EL kernels have a patch that renames PG_checked to FsMisc */
3414 #if defined(ClearPageFsMisc) && !defined(ClearPageChecked)
3415 #define ClearPageChecked ClearPageFsMisc
3416 #define SetPageChecked SetPageFsMisc
3417 #define PageChecked PageFsMisc
3420 /* This forces readahead on a given range of bytes in an inode */
3421 static inline void btrfs_force_ra(struct address_space *mapping,
3422 struct file_ra_state *ra, struct file *file,
3423 pgoff_t offset, unsigned long req_size)
3425 page_cache_sync_readahead(mapping, ra, file, offset, req_size);
3428 struct inode *btrfs_lookup_dentry(struct inode *dir, struct dentry *dentry);
3429 int btrfs_set_inode_index(struct inode *dir, u64 *index);
3430 int btrfs_unlink_inode(struct btrfs_trans_handle *trans,
3431 struct btrfs_root *root,
3432 struct inode *dir, struct inode *inode,
3433 const char *name, int name_len);
3434 int btrfs_add_link(struct btrfs_trans_handle *trans,
3435 struct inode *parent_inode, struct inode *inode,
3436 const char *name, int name_len, int add_backref, u64 index);
3437 int btrfs_unlink_subvol(struct btrfs_trans_handle *trans,
3438 struct btrfs_root *root,
3439 struct inode *dir, u64 objectid,
3440 const char *name, int name_len);
3441 int btrfs_truncate_page(struct inode *inode, loff_t from, loff_t len,
3443 int btrfs_truncate_inode_items(struct btrfs_trans_handle *trans,
3444 struct btrfs_root *root,
3445 struct inode *inode, u64 new_size,
3448 int btrfs_start_delalloc_inodes(struct btrfs_root *root, int delay_iput);
3449 int btrfs_set_extent_delalloc(struct inode *inode, u64 start, u64 end,
3450 struct extent_state **cached_state);
3451 int btrfs_writepages(struct address_space *mapping,
3452 struct writeback_control *wbc);
3453 int btrfs_create_subvol_root(struct btrfs_trans_handle *trans,
3454 struct btrfs_root *new_root, u64 new_dirid);
3455 int btrfs_merge_bio_hook(struct page *page, unsigned long offset,
3456 size_t size, struct bio *bio, unsigned long bio_flags);
3458 int btrfs_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf);
3459 int btrfs_readpage(struct file *file, struct page *page);
3460 void btrfs_evict_inode(struct inode *inode);
3461 int btrfs_write_inode(struct inode *inode, struct writeback_control *wbc);
3462 int btrfs_dirty_inode(struct inode *inode);
3463 struct inode *btrfs_alloc_inode(struct super_block *sb);
3464 void btrfs_destroy_inode(struct inode *inode);
3465 int btrfs_drop_inode(struct inode *inode);
3466 int btrfs_init_cachep(void);
3467 void btrfs_destroy_cachep(void);
3468 long btrfs_ioctl_trans_end(struct file *file);
3469 struct inode *btrfs_iget(struct super_block *s, struct btrfs_key *location,
3470 struct btrfs_root *root, int *was_new);
3471 struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page,
3472 size_t pg_offset, u64 start, u64 end,
3474 int btrfs_update_inode(struct btrfs_trans_handle *trans,
3475 struct btrfs_root *root,
3476 struct inode *inode);
3477 int btrfs_update_inode_fallback(struct btrfs_trans_handle *trans,
3478 struct btrfs_root *root, struct inode *inode);
3479 int btrfs_orphan_add(struct btrfs_trans_handle *trans, struct inode *inode);
3480 int btrfs_orphan_del(struct btrfs_trans_handle *trans, struct inode *inode);
3481 int btrfs_orphan_cleanup(struct btrfs_root *root);
3482 void btrfs_orphan_commit_root(struct btrfs_trans_handle *trans,
3483 struct btrfs_root *root);
3484 int btrfs_cont_expand(struct inode *inode, loff_t oldsize, loff_t size);
3485 void btrfs_invalidate_inodes(struct btrfs_root *root);
3486 void btrfs_add_delayed_iput(struct inode *inode);
3487 void btrfs_run_delayed_iputs(struct btrfs_root *root);
3488 int btrfs_prealloc_file_range(struct inode *inode, int mode,
3489 u64 start, u64 num_bytes, u64 min_size,
3490 loff_t actual_len, u64 *alloc_hint);
3491 int btrfs_prealloc_file_range_trans(struct inode *inode,
3492 struct btrfs_trans_handle *trans, int mode,
3493 u64 start, u64 num_bytes, u64 min_size,
3494 loff_t actual_len, u64 *alloc_hint);
3495 extern const struct dentry_operations btrfs_dentry_operations;
3498 long btrfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
3499 void btrfs_update_iflags(struct inode *inode);
3500 void btrfs_inherit_iflags(struct inode *inode, struct inode *dir);
3501 int btrfs_defrag_file(struct inode *inode, struct file *file,
3502 struct btrfs_ioctl_defrag_range_args *range,
3503 u64 newer_than, unsigned long max_pages);
3504 void btrfs_get_block_group_info(struct list_head *groups_list,
3505 struct btrfs_ioctl_space_info *space);
3508 int btrfs_auto_defrag_init(void);
3509 void btrfs_auto_defrag_exit(void);
3510 int btrfs_add_inode_defrag(struct btrfs_trans_handle *trans,
3511 struct inode *inode);
3512 int btrfs_run_defrag_inodes(struct btrfs_fs_info *fs_info);
3513 void btrfs_cleanup_defrag_inodes(struct btrfs_fs_info *fs_info);
3514 int btrfs_sync_file(struct file *file, loff_t start, loff_t end, int datasync);
3515 void btrfs_drop_extent_cache(struct inode *inode, u64 start, u64 end,
3517 int btrfs_replace_extent_cache(struct inode *inode, struct extent_map *replace,
3518 u64 start, u64 end, int skip_pinned,
3520 extern const struct file_operations btrfs_file_operations;
3521 int __btrfs_drop_extents(struct btrfs_trans_handle *trans,
3522 struct btrfs_root *root, struct inode *inode,
3523 struct btrfs_path *path, u64 start, u64 end,
3524 u64 *drop_end, int drop_cache);
3525 int btrfs_drop_extents(struct btrfs_trans_handle *trans,
3526 struct btrfs_root *root, struct inode *inode, u64 start,
3527 u64 end, int drop_cache);
3528 int btrfs_mark_extent_written(struct btrfs_trans_handle *trans,
3529 struct inode *inode, u64 start, u64 end);
3530 int btrfs_release_file(struct inode *inode, struct file *file);
3531 void btrfs_drop_pages(struct page **pages, size_t num_pages);
3532 int btrfs_dirty_pages(struct btrfs_root *root, struct inode *inode,
3533 struct page **pages, size_t num_pages,
3534 loff_t pos, size_t write_bytes,
3535 struct extent_state **cached);
3538 int btrfs_defrag_leaves(struct btrfs_trans_handle *trans,
3539 struct btrfs_root *root, int cache_only);
3542 int btrfs_init_sysfs(void);
3543 void btrfs_exit_sysfs(void);
3546 ssize_t btrfs_listxattr(struct dentry *dentry, char *buffer, size_t size);
3549 int btrfs_parse_options(struct btrfs_root *root, char *options);
3550 int btrfs_sync_fs(struct super_block *sb, int wait);
3552 #ifdef CONFIG_PRINTK
3554 void btrfs_printk(struct btrfs_fs_info *fs_info, const char *fmt, ...);
3556 static inline __printf(2, 3)
3557 void btrfs_printk(struct btrfs_fs_info *fs_info, const char *fmt, ...)
3563 void __btrfs_std_error(struct btrfs_fs_info *fs_info, const char *function,
3564 unsigned int line, int errno, const char *fmt, ...);
3567 void __btrfs_abort_transaction(struct btrfs_trans_handle *trans,
3568 struct btrfs_root *root, const char *function,
3569 unsigned int line, int errno);
3571 #define btrfs_set_fs_incompat(__fs_info, opt) \
3572 __btrfs_set_fs_incompat((__fs_info), BTRFS_FEATURE_INCOMPAT_##opt)
3574 static inline void __btrfs_set_fs_incompat(struct btrfs_fs_info *fs_info,
3577 struct btrfs_super_block *disk_super;
3580 disk_super = fs_info->super_copy;
3581 features = btrfs_super_incompat_flags(disk_super);
3582 if (!(features & flag)) {
3584 btrfs_set_super_incompat_flags(disk_super, features);
3589 * Call btrfs_abort_transaction as early as possible when an error condition is
3590 * detected, that way the exact line number is reported.
3593 #define btrfs_abort_transaction(trans, root, errno) \
3595 __btrfs_abort_transaction(trans, root, __func__, \
3599 #define btrfs_std_error(fs_info, errno) \
3602 __btrfs_std_error((fs_info), __func__, \
3603 __LINE__, (errno), NULL); \
3606 #define btrfs_error(fs_info, errno, fmt, args...) \
3608 __btrfs_std_error((fs_info), __func__, __LINE__, \
3609 (errno), fmt, ##args); \
3613 void __btrfs_panic(struct btrfs_fs_info *fs_info, const char *function,
3614 unsigned int line, int errno, const char *fmt, ...);
3616 #define btrfs_panic(fs_info, errno, fmt, args...) \
3618 struct btrfs_fs_info *_i = (fs_info); \
3619 __btrfs_panic(_i, __func__, __LINE__, errno, fmt, ##args); \
3620 BUG_ON(!(_i->mount_opt & BTRFS_MOUNT_PANIC_ON_FATAL_ERROR)); \
3624 #ifdef CONFIG_BTRFS_FS_POSIX_ACL
3625 struct posix_acl *btrfs_get_acl(struct inode *inode, int type);
3626 int btrfs_init_acl(struct btrfs_trans_handle *trans,
3627 struct inode *inode, struct inode *dir);
3628 int btrfs_acl_chmod(struct inode *inode);
3630 #define btrfs_get_acl NULL
3631 static inline int btrfs_init_acl(struct btrfs_trans_handle *trans,
3632 struct inode *inode, struct inode *dir)
3636 static inline int btrfs_acl_chmod(struct inode *inode)
3643 int btrfs_relocate_block_group(struct btrfs_root *root, u64 group_start);
3644 int btrfs_init_reloc_root(struct btrfs_trans_handle *trans,
3645 struct btrfs_root *root);
3646 int btrfs_update_reloc_root(struct btrfs_trans_handle *trans,
3647 struct btrfs_root *root);
3648 int btrfs_recover_relocation(struct btrfs_root *root);
3649 int btrfs_reloc_clone_csums(struct inode *inode, u64 file_pos, u64 len);
3650 void btrfs_reloc_cow_block(struct btrfs_trans_handle *trans,
3651 struct btrfs_root *root, struct extent_buffer *buf,
3652 struct extent_buffer *cow);
3653 void btrfs_reloc_pre_snapshot(struct btrfs_trans_handle *trans,
3654 struct btrfs_pending_snapshot *pending,
3655 u64 *bytes_to_reserve);
3656 int btrfs_reloc_post_snapshot(struct btrfs_trans_handle *trans,
3657 struct btrfs_pending_snapshot *pending);
3660 int btrfs_scrub_dev(struct btrfs_fs_info *fs_info, u64 devid, u64 start,
3661 u64 end, struct btrfs_scrub_progress *progress,
3662 int readonly, int is_dev_replace);
3663 void btrfs_scrub_pause(struct btrfs_root *root);
3664 void btrfs_scrub_pause_super(struct btrfs_root *root);
3665 void btrfs_scrub_continue(struct btrfs_root *root);
3666 void btrfs_scrub_continue_super(struct btrfs_root *root);
3667 int btrfs_scrub_cancel(struct btrfs_fs_info *info);
3668 int btrfs_scrub_cancel_dev(struct btrfs_fs_info *info,
3669 struct btrfs_device *dev);
3670 int btrfs_scrub_cancel_devid(struct btrfs_root *root, u64 devid);
3671 int btrfs_scrub_progress(struct btrfs_root *root, u64 devid,
3672 struct btrfs_scrub_progress *progress);
3675 struct reada_control {
3676 struct btrfs_root *root; /* tree to prefetch */
3677 struct btrfs_key key_start;
3678 struct btrfs_key key_end; /* exclusive */
3681 wait_queue_head_t wait;
3683 struct reada_control *btrfs_reada_add(struct btrfs_root *root,
3684 struct btrfs_key *start, struct btrfs_key *end);
3685 int btrfs_reada_wait(void *handle);
3686 void btrfs_reada_detach(void *handle);
3687 int btree_readahead_hook(struct btrfs_root *root, struct extent_buffer *eb,
3688 u64 start, int err);
3691 struct qgroup_update {
3692 struct list_head list;
3693 struct btrfs_delayed_ref_node *node;
3694 struct btrfs_delayed_extent_op *extent_op;
3697 int btrfs_quota_enable(struct btrfs_trans_handle *trans,
3698 struct btrfs_fs_info *fs_info);
3699 int btrfs_quota_disable(struct btrfs_trans_handle *trans,
3700 struct btrfs_fs_info *fs_info);
3701 int btrfs_quota_rescan(struct btrfs_fs_info *fs_info);
3702 int btrfs_add_qgroup_relation(struct btrfs_trans_handle *trans,
3703 struct btrfs_fs_info *fs_info, u64 src, u64 dst);
3704 int btrfs_del_qgroup_relation(struct btrfs_trans_handle *trans,
3705 struct btrfs_fs_info *fs_info, u64 src, u64 dst);
3706 int btrfs_create_qgroup(struct btrfs_trans_handle *trans,
3707 struct btrfs_fs_info *fs_info, u64 qgroupid,
3709 int btrfs_remove_qgroup(struct btrfs_trans_handle *trans,
3710 struct btrfs_fs_info *fs_info, u64 qgroupid);
3711 int btrfs_limit_qgroup(struct btrfs_trans_handle *trans,
3712 struct btrfs_fs_info *fs_info, u64 qgroupid,
3713 struct btrfs_qgroup_limit *limit);
3714 int btrfs_read_qgroup_config(struct btrfs_fs_info *fs_info);
3715 void btrfs_free_qgroup_config(struct btrfs_fs_info *fs_info);
3716 struct btrfs_delayed_extent_op;
3717 int btrfs_qgroup_record_ref(struct btrfs_trans_handle *trans,
3718 struct btrfs_delayed_ref_node *node,
3719 struct btrfs_delayed_extent_op *extent_op);
3720 int btrfs_qgroup_account_ref(struct btrfs_trans_handle *trans,
3721 struct btrfs_fs_info *fs_info,
3722 struct btrfs_delayed_ref_node *node,
3723 struct btrfs_delayed_extent_op *extent_op);
3724 int btrfs_run_qgroups(struct btrfs_trans_handle *trans,
3725 struct btrfs_fs_info *fs_info);
3726 int btrfs_qgroup_inherit(struct btrfs_trans_handle *trans,
3727 struct btrfs_fs_info *fs_info, u64 srcid, u64 objectid,
3728 struct btrfs_qgroup_inherit *inherit);
3729 int btrfs_qgroup_reserve(struct btrfs_root *root, u64 num_bytes);
3730 void btrfs_qgroup_free(struct btrfs_root *root, u64 num_bytes);
3732 void assert_qgroups_uptodate(struct btrfs_trans_handle *trans);
3734 static inline int is_fstree(u64 rootid)
3736 if (rootid == BTRFS_FS_TREE_OBJECTID ||
3737 (s64)rootid >= (s64)BTRFS_FIRST_FREE_OBJECTID)