2 * Copyright (C) 2007 Oracle. All rights reserved.
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public
6 * License v2 as published by the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
13 * You should have received a copy of the GNU General Public
14 * License along with this program; if not, write to the
15 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
16 * Boston, MA 021110-1307, USA.
19 #ifndef __BTRFS_CTREE__
20 #define __BTRFS_CTREE__
23 #include <linux/highmem.h>
25 #include <linux/rwsem.h>
26 #include <linux/semaphore.h>
27 #include <linux/completion.h>
28 #include <linux/backing-dev.h>
29 #include <linux/wait.h>
30 #include <linux/slab.h>
31 #include <linux/kobject.h>
32 #include <trace/events/btrfs.h>
33 #include <asm/kmap_types.h>
34 #include <linux/pagemap.h>
35 #include <linux/btrfs.h>
36 #include "extent_io.h"
37 #include "extent_map.h"
38 #include "async-thread.h"
40 struct btrfs_trans_handle;
41 struct btrfs_transaction;
42 struct btrfs_pending_snapshot;
43 extern struct kmem_cache *btrfs_trans_handle_cachep;
44 extern struct kmem_cache *btrfs_transaction_cachep;
45 extern struct kmem_cache *btrfs_bit_radix_cachep;
46 extern struct kmem_cache *btrfs_path_cachep;
47 extern struct kmem_cache *btrfs_free_space_cachep;
48 struct btrfs_ordered_sum;
50 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
51 #define STATIC noinline
53 #define STATIC static noinline
56 #define BTRFS_MAGIC 0x4D5F53665248425FULL /* ascii _BHRfS_M, no null */
58 #define BTRFS_MAX_MIRRORS 3
60 #define BTRFS_MAX_LEVEL 8
62 #define BTRFS_COMPAT_EXTENT_TREE_V0
65 * files bigger than this get some pre-flushing when they are added
66 * to the ordered operations list. That way we limit the total
67 * work done by the commit
69 #define BTRFS_ORDERED_OPERATIONS_FLUSH_LIMIT (8 * 1024 * 1024)
71 /* holds pointers to all of the tree roots */
72 #define BTRFS_ROOT_TREE_OBJECTID 1ULL
74 /* stores information about which extents are in use, and reference counts */
75 #define BTRFS_EXTENT_TREE_OBJECTID 2ULL
78 * chunk tree stores translations from logical -> physical block numbering
79 * the super block points to the chunk tree
81 #define BTRFS_CHUNK_TREE_OBJECTID 3ULL
84 * stores information about which areas of a given device are in use.
85 * one per device. The tree of tree roots points to the device tree
87 #define BTRFS_DEV_TREE_OBJECTID 4ULL
89 /* one per subvolume, storing files and directories */
90 #define BTRFS_FS_TREE_OBJECTID 5ULL
92 /* directory objectid inside the root tree */
93 #define BTRFS_ROOT_TREE_DIR_OBJECTID 6ULL
95 /* holds checksums of all the data extents */
96 #define BTRFS_CSUM_TREE_OBJECTID 7ULL
98 /* holds quota configuration and tracking */
99 #define BTRFS_QUOTA_TREE_OBJECTID 8ULL
101 /* for storing items that use the BTRFS_UUID_KEY* types */
102 #define BTRFS_UUID_TREE_OBJECTID 9ULL
104 /* for storing balance parameters in the root tree */
105 #define BTRFS_BALANCE_OBJECTID -4ULL
107 /* orhpan objectid for tracking unlinked/truncated files */
108 #define BTRFS_ORPHAN_OBJECTID -5ULL
110 /* does write ahead logging to speed up fsyncs */
111 #define BTRFS_TREE_LOG_OBJECTID -6ULL
112 #define BTRFS_TREE_LOG_FIXUP_OBJECTID -7ULL
114 /* for space balancing */
115 #define BTRFS_TREE_RELOC_OBJECTID -8ULL
116 #define BTRFS_DATA_RELOC_TREE_OBJECTID -9ULL
119 * extent checksums all have this objectid
120 * this allows them to share the logging tree
123 #define BTRFS_EXTENT_CSUM_OBJECTID -10ULL
125 /* For storing free space cache */
126 #define BTRFS_FREE_SPACE_OBJECTID -11ULL
129 * The inode number assigned to the special inode for storing
132 #define BTRFS_FREE_INO_OBJECTID -12ULL
134 /* dummy objectid represents multiple objectids */
135 #define BTRFS_MULTIPLE_OBJECTIDS -255ULL
138 * All files have objectids in this range.
140 #define BTRFS_FIRST_FREE_OBJECTID 256ULL
141 #define BTRFS_LAST_FREE_OBJECTID -256ULL
142 #define BTRFS_FIRST_CHUNK_TREE_OBJECTID 256ULL
146 * the device items go into the chunk tree. The key is in the form
147 * [ 1 BTRFS_DEV_ITEM_KEY device_id ]
149 #define BTRFS_DEV_ITEMS_OBJECTID 1ULL
151 #define BTRFS_BTREE_INODE_OBJECTID 1
153 #define BTRFS_EMPTY_SUBVOL_DIR_OBJECTID 2
155 #define BTRFS_DEV_REPLACE_DEVID 0ULL
158 * the max metadata block size. This limit is somewhat artificial,
159 * but the memmove costs go through the roof for larger blocks.
161 #define BTRFS_MAX_METADATA_BLOCKSIZE 65536
164 * we can actually store much bigger names, but lets not confuse the rest
167 #define BTRFS_NAME_LEN 255
170 * Theoretical limit is larger, but we keep this down to a sane
171 * value. That should limit greatly the possibility of collisions on
174 #define BTRFS_LINK_MAX 65535U
176 /* 32 bytes in various csum fields */
177 #define BTRFS_CSUM_SIZE 32
180 #define BTRFS_CSUM_TYPE_CRC32 0
182 static int btrfs_csum_sizes[] = { 4, 0 };
184 /* four bytes for CRC32 */
185 #define BTRFS_EMPTY_DIR_SIZE 0
187 /* spefic to btrfs_map_block(), therefore not in include/linux/blk_types.h */
188 #define REQ_GET_READ_MIRRORS (1 << 30)
190 #define BTRFS_FT_UNKNOWN 0
191 #define BTRFS_FT_REG_FILE 1
192 #define BTRFS_FT_DIR 2
193 #define BTRFS_FT_CHRDEV 3
194 #define BTRFS_FT_BLKDEV 4
195 #define BTRFS_FT_FIFO 5
196 #define BTRFS_FT_SOCK 6
197 #define BTRFS_FT_SYMLINK 7
198 #define BTRFS_FT_XATTR 8
199 #define BTRFS_FT_MAX 9
201 /* ioprio of readahead is set to idle */
202 #define BTRFS_IOPRIO_READA (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_IDLE, 0))
204 #define BTRFS_DIRTY_METADATA_THRESH (32 * 1024 * 1024)
207 * The key defines the order in the tree, and so it also defines (optimal)
210 * objectid corresponds to the inode number.
212 * type tells us things about the object, and is a kind of stream selector.
213 * so for a given inode, keys with type of 1 might refer to the inode data,
214 * type of 2 may point to file data in the btree and type == 3 may point to
217 * offset is the starting byte offset for this key in the stream.
219 * btrfs_disk_key is in disk byte order. struct btrfs_key is always
220 * in cpu native order. Otherwise they are identical and their sizes
221 * should be the same (ie both packed)
223 struct btrfs_disk_key {
227 } __attribute__ ((__packed__));
233 } __attribute__ ((__packed__));
235 struct btrfs_mapping_tree {
236 struct extent_map_tree map_tree;
239 struct btrfs_dev_item {
240 /* the internal btrfs device id */
243 /* size of the device */
249 /* optimal io alignment for this device */
252 /* optimal io width for this device */
255 /* minimal io size for this device */
258 /* type and info about this device */
261 /* expected generation for this device */
265 * starting byte of this partition on the device,
266 * to allow for stripe alignment in the future
270 /* grouping information for allocation decisions */
273 /* seek speed 0-100 where 100 is fastest */
276 /* bandwidth 0-100 where 100 is fastest */
279 /* btrfs generated uuid for this device */
280 u8 uuid[BTRFS_UUID_SIZE];
282 /* uuid of FS who owns this device */
283 u8 fsid[BTRFS_UUID_SIZE];
284 } __attribute__ ((__packed__));
286 struct btrfs_stripe {
289 u8 dev_uuid[BTRFS_UUID_SIZE];
290 } __attribute__ ((__packed__));
293 /* size of this chunk in bytes */
296 /* objectid of the root referencing this chunk */
302 /* optimal io alignment for this chunk */
305 /* optimal io width for this chunk */
308 /* minimal io size for this chunk */
311 /* 2^16 stripes is quite a lot, a second limit is the size of a single
316 /* sub stripes only matter for raid10 */
318 struct btrfs_stripe stripe;
319 /* additional stripes go here */
320 } __attribute__ ((__packed__));
322 #define BTRFS_FREE_SPACE_EXTENT 1
323 #define BTRFS_FREE_SPACE_BITMAP 2
325 struct btrfs_free_space_entry {
329 } __attribute__ ((__packed__));
331 struct btrfs_free_space_header {
332 struct btrfs_disk_key location;
336 } __attribute__ ((__packed__));
338 static inline unsigned long btrfs_chunk_item_size(int num_stripes)
340 BUG_ON(num_stripes == 0);
341 return sizeof(struct btrfs_chunk) +
342 sizeof(struct btrfs_stripe) * (num_stripes - 1);
345 #define BTRFS_HEADER_FLAG_WRITTEN (1ULL << 0)
346 #define BTRFS_HEADER_FLAG_RELOC (1ULL << 1)
351 #define BTRFS_FS_STATE_ERROR 0
352 #define BTRFS_FS_STATE_REMOUNTING 1
353 #define BTRFS_FS_STATE_TRANS_ABORTED 2
354 #define BTRFS_FS_STATE_DEV_REPLACING 3
356 /* Super block flags */
357 /* Errors detected */
358 #define BTRFS_SUPER_FLAG_ERROR (1ULL << 2)
360 #define BTRFS_SUPER_FLAG_SEEDING (1ULL << 32)
361 #define BTRFS_SUPER_FLAG_METADUMP (1ULL << 33)
363 #define BTRFS_BACKREF_REV_MAX 256
364 #define BTRFS_BACKREF_REV_SHIFT 56
365 #define BTRFS_BACKREF_REV_MASK (((u64)BTRFS_BACKREF_REV_MAX - 1) << \
366 BTRFS_BACKREF_REV_SHIFT)
368 #define BTRFS_OLD_BACKREF_REV 0
369 #define BTRFS_MIXED_BACKREF_REV 1
372 * every tree block (leaf or node) starts with this header.
374 struct btrfs_header {
375 /* these first four must match the super block */
376 u8 csum[BTRFS_CSUM_SIZE];
377 u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
378 __le64 bytenr; /* which block this node is supposed to live in */
381 /* allowed to be different from the super from here on down */
382 u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
387 } __attribute__ ((__packed__));
389 #define BTRFS_NODEPTRS_PER_BLOCK(r) (((r)->nodesize - \
390 sizeof(struct btrfs_header)) / \
391 sizeof(struct btrfs_key_ptr))
392 #define __BTRFS_LEAF_DATA_SIZE(bs) ((bs) - sizeof(struct btrfs_header))
393 #define BTRFS_LEAF_DATA_SIZE(r) (__BTRFS_LEAF_DATA_SIZE(r->leafsize))
394 #define BTRFS_MAX_INLINE_DATA_SIZE(r) (BTRFS_LEAF_DATA_SIZE(r) - \
395 sizeof(struct btrfs_item) - \
396 sizeof(struct btrfs_file_extent_item))
397 #define BTRFS_MAX_XATTR_SIZE(r) (BTRFS_LEAF_DATA_SIZE(r) - \
398 sizeof(struct btrfs_item) -\
399 sizeof(struct btrfs_dir_item))
403 * this is a very generous portion of the super block, giving us
404 * room to translate 14 chunks with 3 stripes each.
406 #define BTRFS_SYSTEM_CHUNK_ARRAY_SIZE 2048
407 #define BTRFS_LABEL_SIZE 256
410 * just in case we somehow lose the roots and are not able to mount,
411 * we store an array of the roots from previous transactions
414 #define BTRFS_NUM_BACKUP_ROOTS 4
415 struct btrfs_root_backup {
417 __le64 tree_root_gen;
420 __le64 chunk_root_gen;
423 __le64 extent_root_gen;
432 __le64 csum_root_gen;
442 u8 extent_root_level;
446 /* future and to align */
448 } __attribute__ ((__packed__));
451 * the super block basically lists the main trees of the FS
452 * it currently lacks any block count etc etc
454 struct btrfs_super_block {
455 u8 csum[BTRFS_CSUM_SIZE];
456 /* the first 4 fields must match struct btrfs_header */
457 u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
458 __le64 bytenr; /* this block number */
461 /* allowed to be different from the btrfs_header from here own down */
468 /* this will help find the new super based on the log root */
469 __le64 log_root_transid;
472 __le64 root_dir_objectid;
478 __le32 sys_chunk_array_size;
479 __le64 chunk_root_generation;
481 __le64 compat_ro_flags;
482 __le64 incompat_flags;
487 struct btrfs_dev_item dev_item;
489 char label[BTRFS_LABEL_SIZE];
491 __le64 cache_generation;
492 __le64 uuid_tree_generation;
494 /* future expansion */
496 u8 sys_chunk_array[BTRFS_SYSTEM_CHUNK_ARRAY_SIZE];
497 struct btrfs_root_backup super_roots[BTRFS_NUM_BACKUP_ROOTS];
498 } __attribute__ ((__packed__));
501 * Compat flags that we support. If any incompat flags are set other than the
502 * ones specified below then we will fail to mount
504 #define BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF (1ULL << 0)
505 #define BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL (1ULL << 1)
506 #define BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS (1ULL << 2)
507 #define BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO (1ULL << 3)
509 * some patches floated around with a second compression method
510 * lets save that incompat here for when they do get in
511 * Note we don't actually support it, we're just reserving the
514 #define BTRFS_FEATURE_INCOMPAT_COMPRESS_LZOv2 (1ULL << 4)
517 * older kernels tried to do bigger metadata blocks, but the
518 * code was pretty buggy. Lets not let them try anymore.
520 #define BTRFS_FEATURE_INCOMPAT_BIG_METADATA (1ULL << 5)
522 #define BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF (1ULL << 6)
523 #define BTRFS_FEATURE_INCOMPAT_RAID56 (1ULL << 7)
524 #define BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA (1ULL << 8)
525 #define BTRFS_FEATURE_INCOMPAT_NO_HOLES (1ULL << 9)
527 #define BTRFS_FEATURE_COMPAT_SUPP 0ULL
528 #define BTRFS_FEATURE_COMPAT_SAFE_SET 0ULL
529 #define BTRFS_FEATURE_COMPAT_SAFE_CLEAR 0ULL
530 #define BTRFS_FEATURE_COMPAT_RO_SUPP 0ULL
531 #define BTRFS_FEATURE_COMPAT_RO_SAFE_SET 0ULL
532 #define BTRFS_FEATURE_COMPAT_RO_SAFE_CLEAR 0ULL
534 #define BTRFS_FEATURE_INCOMPAT_SUPP \
535 (BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF | \
536 BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL | \
537 BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS | \
538 BTRFS_FEATURE_INCOMPAT_BIG_METADATA | \
539 BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO | \
540 BTRFS_FEATURE_INCOMPAT_RAID56 | \
541 BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF | \
542 BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA | \
543 BTRFS_FEATURE_INCOMPAT_NO_HOLES)
545 #define BTRFS_FEATURE_INCOMPAT_SAFE_SET \
546 (BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF)
547 #define BTRFS_FEATURE_INCOMPAT_SAFE_CLEAR 0ULL
550 * A leaf is full of items. offset and size tell us where to find
551 * the item in the leaf (relative to the start of the data area)
554 struct btrfs_disk_key key;
557 } __attribute__ ((__packed__));
560 * leaves have an item area and a data area:
561 * [item0, item1....itemN] [free space] [dataN...data1, data0]
563 * The data is separate from the items to get the keys closer together
567 struct btrfs_header header;
568 struct btrfs_item items[];
569 } __attribute__ ((__packed__));
572 * all non-leaf blocks are nodes, they hold only keys and pointers to
575 struct btrfs_key_ptr {
576 struct btrfs_disk_key key;
579 } __attribute__ ((__packed__));
582 struct btrfs_header header;
583 struct btrfs_key_ptr ptrs[];
584 } __attribute__ ((__packed__));
587 * btrfs_paths remember the path taken from the root down to the leaf.
588 * level 0 is always the leaf, and nodes[1...BTRFS_MAX_LEVEL] will point
589 * to any other levels that are present.
591 * The slots array records the index of the item or block pointer
592 * used while walking the tree.
595 struct extent_buffer *nodes[BTRFS_MAX_LEVEL];
596 int slots[BTRFS_MAX_LEVEL];
597 /* if there is real range locking, this locks field will change */
598 int locks[BTRFS_MAX_LEVEL];
600 /* keep some upper locks as we walk down */
604 * set by btrfs_split_item, tells search_slot to keep all locks
605 * and to force calls to keep space in the nodes
607 unsigned int search_for_split:1;
608 unsigned int keep_locks:1;
609 unsigned int skip_locking:1;
610 unsigned int leave_spinning:1;
611 unsigned int search_commit_root:1;
615 * items in the extent btree are used to record the objectid of the
616 * owner of the block and the number of references
619 struct btrfs_extent_item {
623 } __attribute__ ((__packed__));
625 struct btrfs_extent_item_v0 {
627 } __attribute__ ((__packed__));
629 #define BTRFS_MAX_EXTENT_ITEM_SIZE(r) ((BTRFS_LEAF_DATA_SIZE(r) >> 4) - \
630 sizeof(struct btrfs_item))
632 #define BTRFS_EXTENT_FLAG_DATA (1ULL << 0)
633 #define BTRFS_EXTENT_FLAG_TREE_BLOCK (1ULL << 1)
635 /* following flags only apply to tree blocks */
637 /* use full backrefs for extent pointers in the block */
638 #define BTRFS_BLOCK_FLAG_FULL_BACKREF (1ULL << 8)
641 * this flag is only used internally by scrub and may be changed at any time
642 * it is only declared here to avoid collisions
644 #define BTRFS_EXTENT_FLAG_SUPER (1ULL << 48)
646 struct btrfs_tree_block_info {
647 struct btrfs_disk_key key;
649 } __attribute__ ((__packed__));
651 struct btrfs_extent_data_ref {
656 } __attribute__ ((__packed__));
658 struct btrfs_shared_data_ref {
660 } __attribute__ ((__packed__));
662 struct btrfs_extent_inline_ref {
665 } __attribute__ ((__packed__));
667 /* old style backrefs item */
668 struct btrfs_extent_ref_v0 {
673 } __attribute__ ((__packed__));
676 /* dev extents record free space on individual devices. The owner
677 * field points back to the chunk allocation mapping tree that allocated
678 * the extent. The chunk tree uuid field is a way to double check the owner
680 struct btrfs_dev_extent {
682 __le64 chunk_objectid;
685 u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
686 } __attribute__ ((__packed__));
688 struct btrfs_inode_ref {
692 } __attribute__ ((__packed__));
694 struct btrfs_inode_extref {
695 __le64 parent_objectid;
700 } __attribute__ ((__packed__));
702 struct btrfs_timespec {
705 } __attribute__ ((__packed__));
707 enum btrfs_compression_type {
708 BTRFS_COMPRESS_NONE = 0,
709 BTRFS_COMPRESS_ZLIB = 1,
710 BTRFS_COMPRESS_LZO = 2,
711 BTRFS_COMPRESS_TYPES = 2,
712 BTRFS_COMPRESS_LAST = 3,
715 struct btrfs_inode_item {
716 /* nfs style generation number */
718 /* transid that last touched this inode */
730 /* modification sequence number for NFS */
734 * a little future expansion, for more than this we can
735 * just grow the inode item and version it
738 struct btrfs_timespec atime;
739 struct btrfs_timespec ctime;
740 struct btrfs_timespec mtime;
741 struct btrfs_timespec otime;
742 } __attribute__ ((__packed__));
744 struct btrfs_dir_log_item {
746 } __attribute__ ((__packed__));
748 struct btrfs_dir_item {
749 struct btrfs_disk_key location;
754 } __attribute__ ((__packed__));
756 #define BTRFS_ROOT_SUBVOL_RDONLY (1ULL << 0)
758 struct btrfs_root_item {
759 struct btrfs_inode_item inode;
765 __le64 last_snapshot;
768 struct btrfs_disk_key drop_progress;
773 * The following fields appear after subvol_uuids+subvol_times
778 * This generation number is used to test if the new fields are valid
779 * and up to date while reading the root item. Everytime the root item
780 * is written out, the "generation" field is copied into this field. If
781 * anyone ever mounted the fs with an older kernel, we will have
782 * mismatching generation values here and thus must invalidate the
783 * new fields. See btrfs_update_root and btrfs_find_last_root for
785 * the offset of generation_v2 is also used as the start for the memset
786 * when invalidating the fields.
788 __le64 generation_v2;
789 u8 uuid[BTRFS_UUID_SIZE];
790 u8 parent_uuid[BTRFS_UUID_SIZE];
791 u8 received_uuid[BTRFS_UUID_SIZE];
792 __le64 ctransid; /* updated when an inode changes */
793 __le64 otransid; /* trans when created */
794 __le64 stransid; /* trans when sent. non-zero for received subvol */
795 __le64 rtransid; /* trans when received. non-zero for received subvol */
796 struct btrfs_timespec ctime;
797 struct btrfs_timespec otime;
798 struct btrfs_timespec stime;
799 struct btrfs_timespec rtime;
800 __le64 reserved[8]; /* for future */
801 } __attribute__ ((__packed__));
804 * this is used for both forward and backward root refs
806 struct btrfs_root_ref {
810 } __attribute__ ((__packed__));
812 struct btrfs_disk_balance_args {
814 * profiles to operate on, single is denoted by
815 * BTRFS_AVAIL_ALLOC_BIT_SINGLE
825 /* devid subset filter [pstart..pend) */
829 /* btrfs virtual address space subset filter [vstart..vend) */
834 * profile to convert to, single is denoted by
835 * BTRFS_AVAIL_ALLOC_BIT_SINGLE
839 /* BTRFS_BALANCE_ARGS_* */
843 } __attribute__ ((__packed__));
846 * store balance parameters to disk so that balance can be properly
847 * resumed after crash or unmount
849 struct btrfs_balance_item {
850 /* BTRFS_BALANCE_* */
853 struct btrfs_disk_balance_args data;
854 struct btrfs_disk_balance_args meta;
855 struct btrfs_disk_balance_args sys;
858 } __attribute__ ((__packed__));
860 #define BTRFS_FILE_EXTENT_INLINE 0
861 #define BTRFS_FILE_EXTENT_REG 1
862 #define BTRFS_FILE_EXTENT_PREALLOC 2
864 struct btrfs_file_extent_item {
866 * transaction id that created this extent
870 * max number of bytes to hold this extent in ram
871 * when we split a compressed extent we can't know how big
872 * each of the resulting pieces will be. So, this is
873 * an upper limit on the size of the extent in ram instead of
879 * 32 bits for the various ways we might encode the data,
880 * including compression and encryption. If any of these
881 * are set to something a given disk format doesn't understand
882 * it is treated like an incompat flag for reading and writing,
887 __le16 other_encoding; /* spare for later use */
889 /* are we inline data or a real extent? */
893 * disk space consumed by the extent, checksum blocks are included
897 __le64 disk_num_bytes;
899 * the logical offset in file blocks (no csums)
900 * this extent record is for. This allows a file extent to point
901 * into the middle of an existing extent on disk, sharing it
902 * between two snapshots (useful if some bytes in the middle of the
903 * extent have changed
907 * the logical number of file blocks (no csums included). This
908 * always reflects the size uncompressed and without encoding.
912 } __attribute__ ((__packed__));
914 struct btrfs_csum_item {
916 } __attribute__ ((__packed__));
918 struct btrfs_dev_stats_item {
920 * grow this item struct at the end for future enhancements and keep
921 * the existing values unchanged
923 __le64 values[BTRFS_DEV_STAT_VALUES_MAX];
924 } __attribute__ ((__packed__));
926 #define BTRFS_DEV_REPLACE_ITEM_CONT_READING_FROM_SRCDEV_MODE_ALWAYS 0
927 #define BTRFS_DEV_REPLACE_ITEM_CONT_READING_FROM_SRCDEV_MODE_AVOID 1
928 #define BTRFS_DEV_REPLACE_ITEM_STATE_NEVER_STARTED 0
929 #define BTRFS_DEV_REPLACE_ITEM_STATE_STARTED 1
930 #define BTRFS_DEV_REPLACE_ITEM_STATE_SUSPENDED 2
931 #define BTRFS_DEV_REPLACE_ITEM_STATE_FINISHED 3
932 #define BTRFS_DEV_REPLACE_ITEM_STATE_CANCELED 4
934 struct btrfs_dev_replace {
935 u64 replace_state; /* see #define above */
936 u64 time_started; /* seconds since 1-Jan-1970 */
937 u64 time_stopped; /* seconds since 1-Jan-1970 */
938 atomic64_t num_write_errors;
939 atomic64_t num_uncorrectable_read_errors;
942 u64 committed_cursor_left;
943 u64 cursor_left_last_write_of_item;
946 u64 cont_reading_from_srcdev_mode; /* see #define above */
949 int item_needs_writeback;
950 struct btrfs_device *srcdev;
951 struct btrfs_device *tgtdev;
954 atomic_t nesting_level;
955 struct mutex lock_finishing_cancel_unmount;
956 struct mutex lock_management_lock;
959 struct btrfs_scrub_progress scrub_progress;
962 struct btrfs_dev_replace_item {
964 * grow this item struct at the end for future enhancements and keep
965 * the existing values unchanged
970 __le64 cont_reading_from_srcdev_mode;
972 __le64 replace_state;
975 __le64 num_write_errors;
976 __le64 num_uncorrectable_read_errors;
977 } __attribute__ ((__packed__));
979 /* different types of block groups (and chunks) */
980 #define BTRFS_BLOCK_GROUP_DATA (1ULL << 0)
981 #define BTRFS_BLOCK_GROUP_SYSTEM (1ULL << 1)
982 #define BTRFS_BLOCK_GROUP_METADATA (1ULL << 2)
983 #define BTRFS_BLOCK_GROUP_RAID0 (1ULL << 3)
984 #define BTRFS_BLOCK_GROUP_RAID1 (1ULL << 4)
985 #define BTRFS_BLOCK_GROUP_DUP (1ULL << 5)
986 #define BTRFS_BLOCK_GROUP_RAID10 (1ULL << 6)
987 #define BTRFS_BLOCK_GROUP_RAID5 (1ULL << 7)
988 #define BTRFS_BLOCK_GROUP_RAID6 (1ULL << 8)
989 #define BTRFS_BLOCK_GROUP_RESERVED BTRFS_AVAIL_ALLOC_BIT_SINGLE
991 enum btrfs_raid_types {
1002 #define BTRFS_BLOCK_GROUP_TYPE_MASK (BTRFS_BLOCK_GROUP_DATA | \
1003 BTRFS_BLOCK_GROUP_SYSTEM | \
1004 BTRFS_BLOCK_GROUP_METADATA)
1006 #define BTRFS_BLOCK_GROUP_PROFILE_MASK (BTRFS_BLOCK_GROUP_RAID0 | \
1007 BTRFS_BLOCK_GROUP_RAID1 | \
1008 BTRFS_BLOCK_GROUP_RAID5 | \
1009 BTRFS_BLOCK_GROUP_RAID6 | \
1010 BTRFS_BLOCK_GROUP_DUP | \
1011 BTRFS_BLOCK_GROUP_RAID10)
1013 * We need a bit for restriper to be able to tell when chunks of type
1014 * SINGLE are available. This "extended" profile format is used in
1015 * fs_info->avail_*_alloc_bits (in-memory) and balance item fields
1016 * (on-disk). The corresponding on-disk bit in chunk.type is reserved
1017 * to avoid remappings between two formats in future.
1019 #define BTRFS_AVAIL_ALLOC_BIT_SINGLE (1ULL << 48)
1021 #define BTRFS_EXTENDED_PROFILE_MASK (BTRFS_BLOCK_GROUP_PROFILE_MASK | \
1022 BTRFS_AVAIL_ALLOC_BIT_SINGLE)
1024 static inline u64 chunk_to_extended(u64 flags)
1026 if ((flags & BTRFS_BLOCK_GROUP_PROFILE_MASK) == 0)
1027 flags |= BTRFS_AVAIL_ALLOC_BIT_SINGLE;
1031 static inline u64 extended_to_chunk(u64 flags)
1033 return flags & ~BTRFS_AVAIL_ALLOC_BIT_SINGLE;
1036 struct btrfs_block_group_item {
1038 __le64 chunk_objectid;
1040 } __attribute__ ((__packed__));
1043 * is subvolume quota turned on?
1045 #define BTRFS_QGROUP_STATUS_FLAG_ON (1ULL << 0)
1047 * RESCAN is set during the initialization phase
1049 #define BTRFS_QGROUP_STATUS_FLAG_RESCAN (1ULL << 1)
1051 * Some qgroup entries are known to be out of date,
1052 * either because the configuration has changed in a way that
1053 * makes a rescan necessary, or because the fs has been mounted
1054 * with a non-qgroup-aware version.
1055 * Turning qouta off and on again makes it inconsistent, too.
1057 #define BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT (1ULL << 2)
1059 #define BTRFS_QGROUP_STATUS_VERSION 1
1061 struct btrfs_qgroup_status_item {
1064 * the generation is updated during every commit. As older
1065 * versions of btrfs are not aware of qgroups, it will be
1066 * possible to detect inconsistencies by checking the
1067 * generation on mount time
1071 /* flag definitions see above */
1075 * only used during scanning to record the progress
1076 * of the scan. It contains a logical address
1079 } __attribute__ ((__packed__));
1081 struct btrfs_qgroup_info_item {
1087 } __attribute__ ((__packed__));
1089 /* flags definition for qgroup limits */
1090 #define BTRFS_QGROUP_LIMIT_MAX_RFER (1ULL << 0)
1091 #define BTRFS_QGROUP_LIMIT_MAX_EXCL (1ULL << 1)
1092 #define BTRFS_QGROUP_LIMIT_RSV_RFER (1ULL << 2)
1093 #define BTRFS_QGROUP_LIMIT_RSV_EXCL (1ULL << 3)
1094 #define BTRFS_QGROUP_LIMIT_RFER_CMPR (1ULL << 4)
1095 #define BTRFS_QGROUP_LIMIT_EXCL_CMPR (1ULL << 5)
1097 struct btrfs_qgroup_limit_item {
1099 * only updated when any of the other values change
1106 } __attribute__ ((__packed__));
1108 struct btrfs_space_info {
1111 u64 total_bytes; /* total bytes in the space,
1112 this doesn't take mirrors into account */
1113 u64 bytes_used; /* total bytes used,
1114 this doesn't take mirrors into account */
1115 u64 bytes_pinned; /* total bytes pinned, will be freed when the
1116 transaction finishes */
1117 u64 bytes_reserved; /* total bytes the allocator has reserved for
1118 current allocations */
1119 u64 bytes_may_use; /* number of bytes that may be used for
1120 delalloc/allocations */
1121 u64 bytes_readonly; /* total bytes that are read only */
1123 unsigned int full:1; /* indicates that we cannot allocate any more
1124 chunks for this space */
1125 unsigned int chunk_alloc:1; /* set if we are allocating a chunk */
1127 unsigned int flush:1; /* set if we are trying to make space */
1129 unsigned int force_alloc; /* set if we need to force a chunk
1130 alloc for this space */
1132 u64 disk_used; /* total bytes used on disk */
1133 u64 disk_total; /* total bytes on disk, takes mirrors into
1139 * bytes_pinned is kept in line with what is actually pinned, as in
1140 * we've called update_block_group and dropped the bytes_used counter
1141 * and increased the bytes_pinned counter. However this means that
1142 * bytes_pinned does not reflect the bytes that will be pinned once the
1143 * delayed refs are flushed, so this counter is inc'ed everytime we call
1144 * btrfs_free_extent so it is a realtime count of what will be freed
1145 * once the transaction is committed. It will be zero'ed everytime the
1146 * transaction commits.
1148 struct percpu_counter total_bytes_pinned;
1150 struct list_head list;
1152 struct rw_semaphore groups_sem;
1153 /* for block groups in our same type */
1154 struct list_head block_groups[BTRFS_NR_RAID_TYPES];
1155 wait_queue_head_t wait;
1157 struct kobject kobj;
1158 struct kobject block_group_kobjs[BTRFS_NR_RAID_TYPES];
1161 #define BTRFS_BLOCK_RSV_GLOBAL 1
1162 #define BTRFS_BLOCK_RSV_DELALLOC 2
1163 #define BTRFS_BLOCK_RSV_TRANS 3
1164 #define BTRFS_BLOCK_RSV_CHUNK 4
1165 #define BTRFS_BLOCK_RSV_DELOPS 5
1166 #define BTRFS_BLOCK_RSV_EMPTY 6
1167 #define BTRFS_BLOCK_RSV_TEMP 7
1169 struct btrfs_block_rsv {
1172 struct btrfs_space_info *space_info;
1174 unsigned short full;
1175 unsigned short type;
1176 unsigned short failfast;
1180 * free clusters are used to claim free space in relatively large chunks,
1181 * allowing us to do less seeky writes. They are used for all metadata
1182 * allocations and data allocations in ssd mode.
1184 struct btrfs_free_cluster {
1186 spinlock_t refill_lock;
1187 struct rb_root root;
1189 /* largest extent in this cluster */
1192 /* first extent starting offset */
1195 struct btrfs_block_group_cache *block_group;
1197 * when a cluster is allocated from a block group, we put the
1198 * cluster onto a list in the block group so that it can
1199 * be freed before the block group is freed.
1201 struct list_head block_group_list;
1204 enum btrfs_caching_type {
1206 BTRFS_CACHE_STARTED = 1,
1207 BTRFS_CACHE_FAST = 2,
1208 BTRFS_CACHE_FINISHED = 3,
1209 BTRFS_CACHE_ERROR = 4,
1212 enum btrfs_disk_cache_state {
1213 BTRFS_DC_WRITTEN = 0,
1217 BTRFS_DC_NEED_WRITE = 4,
1220 struct btrfs_caching_control {
1221 struct list_head list;
1223 wait_queue_head_t wait;
1224 struct btrfs_work work;
1225 struct btrfs_block_group_cache *block_group;
1230 struct btrfs_block_group_cache {
1231 struct btrfs_key key;
1232 struct btrfs_block_group_item item;
1233 struct btrfs_fs_info *fs_info;
1234 struct inode *inode;
1241 u64 cache_generation;
1243 /* for raid56, this is a full stripe, without parity */
1244 unsigned long full_stripe_len;
1247 unsigned int dirty:1;
1248 unsigned int iref:1;
1250 int disk_cache_state;
1252 /* cache tracking stuff */
1254 struct btrfs_caching_control *caching_ctl;
1255 u64 last_byte_to_unpin;
1257 struct btrfs_space_info *space_info;
1259 /* free space cache stuff */
1260 struct btrfs_free_space_ctl *free_space_ctl;
1262 /* block group cache stuff */
1263 struct rb_node cache_node;
1265 /* for block groups in the same raid type */
1266 struct list_head list;
1271 /* List of struct btrfs_free_clusters for this block group.
1272 * Today it will only have one thing on it, but that may change
1274 struct list_head cluster_list;
1276 /* For delayed block group creation */
1277 struct list_head new_bg_list;
1280 /* delayed seq elem */
1282 struct list_head list;
1286 enum btrfs_orphan_cleanup_state {
1287 ORPHAN_CLEANUP_STARTED = 1,
1288 ORPHAN_CLEANUP_DONE = 2,
1291 /* used by the raid56 code to lock stripes for read/modify/write */
1292 struct btrfs_stripe_hash {
1293 struct list_head hash_list;
1294 wait_queue_head_t wait;
1298 /* used by the raid56 code to lock stripes for read/modify/write */
1299 struct btrfs_stripe_hash_table {
1300 struct list_head stripe_cache;
1301 spinlock_t cache_lock;
1303 struct btrfs_stripe_hash table[];
1306 #define BTRFS_STRIPE_HASH_TABLE_BITS 11
1309 struct reloc_control;
1310 struct btrfs_device;
1311 struct btrfs_fs_devices;
1312 struct btrfs_balance_control;
1313 struct btrfs_delayed_root;
1314 struct btrfs_fs_info {
1315 u8 fsid[BTRFS_FSID_SIZE];
1316 u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
1317 struct btrfs_root *extent_root;
1318 struct btrfs_root *tree_root;
1319 struct btrfs_root *chunk_root;
1320 struct btrfs_root *dev_root;
1321 struct btrfs_root *fs_root;
1322 struct btrfs_root *csum_root;
1323 struct btrfs_root *quota_root;
1324 struct btrfs_root *uuid_root;
1326 /* the log root tree is a directory of all the other log roots */
1327 struct btrfs_root *log_root_tree;
1329 spinlock_t fs_roots_radix_lock;
1330 struct radix_tree_root fs_roots_radix;
1332 /* block group cache stuff */
1333 spinlock_t block_group_cache_lock;
1334 u64 first_logical_byte;
1335 struct rb_root block_group_cache_tree;
1337 /* keep track of unallocated space */
1338 spinlock_t free_chunk_lock;
1339 u64 free_chunk_space;
1341 struct extent_io_tree freed_extents[2];
1342 struct extent_io_tree *pinned_extents;
1344 /* logical->physical extent mapping */
1345 struct btrfs_mapping_tree mapping_tree;
1348 * block reservation for extent, checksum, root tree and
1349 * delayed dir index item
1351 struct btrfs_block_rsv global_block_rsv;
1352 /* block reservation for delay allocation */
1353 struct btrfs_block_rsv delalloc_block_rsv;
1354 /* block reservation for metadata operations */
1355 struct btrfs_block_rsv trans_block_rsv;
1356 /* block reservation for chunk tree */
1357 struct btrfs_block_rsv chunk_block_rsv;
1358 /* block reservation for delayed operations */
1359 struct btrfs_block_rsv delayed_block_rsv;
1361 struct btrfs_block_rsv empty_block_rsv;
1364 u64 last_trans_committed;
1365 u64 avg_delayed_ref_runtime;
1368 * this is updated to the current trans every time a full commit
1369 * is required instead of the faster short fsync log commits
1371 u64 last_trans_log_full_commit;
1372 unsigned long mount_opt;
1373 unsigned long compress_type:4;
1374 int commit_interval;
1376 * It is a suggestive number, the read side is safe even it gets a
1377 * wrong number because we will write out the data into a regular
1378 * extent. The write side(mount/remount) is under ->s_umount lock,
1379 * so it is also safe.
1383 * Protected by ->chunk_mutex and sb->s_umount.
1385 * The reason that we use two lock to protect it is because only
1386 * remount and mount operations can change it and these two operations
1387 * are under sb->s_umount, but the read side (chunk allocation) can not
1388 * acquire sb->s_umount or the deadlock would happen. So we use two
1389 * locks to protect it. On the write side, we must acquire two locks,
1390 * and on the read side, we just need acquire one of them.
1393 struct btrfs_transaction *running_transaction;
1394 wait_queue_head_t transaction_throttle;
1395 wait_queue_head_t transaction_wait;
1396 wait_queue_head_t transaction_blocked_wait;
1397 wait_queue_head_t async_submit_wait;
1400 * Used to protect the incompat_flags, compat_flags, compat_ro_flags
1401 * when they are updated.
1403 * Because we do not clear the flags for ever, so we needn't use
1404 * the lock on the read side.
1406 * We also needn't use the lock when we mount the fs, because
1407 * there is no other task which will update the flag.
1409 spinlock_t super_lock;
1410 struct btrfs_super_block *super_copy;
1411 struct btrfs_super_block *super_for_commit;
1412 struct block_device *__bdev;
1413 struct super_block *sb;
1414 struct inode *btree_inode;
1415 struct backing_dev_info bdi;
1416 struct mutex tree_log_mutex;
1417 struct mutex transaction_kthread_mutex;
1418 struct mutex cleaner_mutex;
1419 struct mutex chunk_mutex;
1420 struct mutex volume_mutex;
1422 /* this is used during read/modify/write to make sure
1423 * no two ios are trying to mod the same stripe at the same
1426 struct btrfs_stripe_hash_table *stripe_hash_table;
1429 * this protects the ordered operations list only while we are
1430 * processing all of the entries on it. This way we make
1431 * sure the commit code doesn't find the list temporarily empty
1432 * because another function happens to be doing non-waiting preflush
1433 * before jumping into the main commit.
1435 struct mutex ordered_operations_mutex;
1438 * Same as ordered_operations_mutex except this is for ordered extents
1439 * and not the operations.
1441 struct mutex ordered_extent_flush_mutex;
1443 struct rw_semaphore extent_commit_sem;
1445 struct rw_semaphore cleanup_work_sem;
1447 struct rw_semaphore subvol_sem;
1448 struct srcu_struct subvol_srcu;
1450 spinlock_t trans_lock;
1452 * the reloc mutex goes with the trans lock, it is taken
1453 * during commit to protect us from the relocation code
1455 struct mutex reloc_mutex;
1457 struct list_head trans_list;
1458 struct list_head dead_roots;
1459 struct list_head caching_block_groups;
1461 spinlock_t delayed_iput_lock;
1462 struct list_head delayed_iputs;
1464 /* this protects tree_mod_seq_list */
1465 spinlock_t tree_mod_seq_lock;
1466 atomic64_t tree_mod_seq;
1467 struct list_head tree_mod_seq_list;
1469 /* this protects tree_mod_log */
1470 rwlock_t tree_mod_log_lock;
1471 struct rb_root tree_mod_log;
1473 atomic_t nr_async_submits;
1474 atomic_t async_submit_draining;
1475 atomic_t nr_async_bios;
1476 atomic_t async_delalloc_pages;
1477 atomic_t open_ioctl_trans;
1480 * this is used to protect the following list -- ordered_roots.
1482 spinlock_t ordered_root_lock;
1485 * all fs/file tree roots in which there are data=ordered extents
1486 * pending writeback are added into this list.
1488 * these can span multiple transactions and basically include
1489 * every dirty data page that isn't from nodatacow
1491 struct list_head ordered_roots;
1493 struct mutex delalloc_root_mutex;
1494 spinlock_t delalloc_root_lock;
1495 /* all fs/file tree roots that have delalloc inodes. */
1496 struct list_head delalloc_roots;
1499 * there is a pool of worker threads for checksumming during writes
1500 * and a pool for checksumming after reads. This is because readers
1501 * can run with FS locks held, and the writers may be waiting for
1502 * those locks. We don't want ordering in the pending list to cause
1503 * deadlocks, and so the two are serviced separately.
1505 * A third pool does submit_bio to avoid deadlocking with the other
1508 struct btrfs_workqueue *workers;
1509 struct btrfs_workqueue *delalloc_workers;
1510 struct btrfs_workqueue *flush_workers;
1511 struct btrfs_workqueue *endio_workers;
1512 struct btrfs_workqueue *endio_meta_workers;
1513 struct btrfs_workqueue *endio_raid56_workers;
1514 struct btrfs_workqueue *rmw_workers;
1515 struct btrfs_workqueue *endio_meta_write_workers;
1516 struct btrfs_workqueue *endio_write_workers;
1517 struct btrfs_workqueue *endio_freespace_worker;
1518 struct btrfs_workqueue *submit_workers;
1519 struct btrfs_workqueue *caching_workers;
1520 struct btrfs_workqueue *readahead_workers;
1523 * fixup workers take dirty pages that didn't properly go through
1524 * the cow mechanism and make them safe to write. It happens
1525 * for the sys_munmap function call path
1527 struct btrfs_workqueue *fixup_workers;
1528 struct btrfs_workqueue *delayed_workers;
1529 struct task_struct *transaction_kthread;
1530 struct task_struct *cleaner_kthread;
1531 int thread_pool_size;
1533 struct kobject super_kobj;
1534 struct kobject *space_info_kobj;
1535 struct kobject *device_dir_kobj;
1536 struct completion kobj_unregister;
1539 int log_root_recovering;
1543 /* used to keep from writing metadata until there is a nice batch */
1544 struct percpu_counter dirty_metadata_bytes;
1545 struct percpu_counter delalloc_bytes;
1546 s32 dirty_metadata_batch;
1549 struct list_head dirty_cowonly_roots;
1551 struct btrfs_fs_devices *fs_devices;
1554 * the space_info list is almost entirely read only. It only changes
1555 * when we add a new raid type to the FS, and that happens
1556 * very rarely. RCU is used to protect it.
1558 struct list_head space_info;
1560 struct btrfs_space_info *data_sinfo;
1562 struct reloc_control *reloc_ctl;
1564 /* data_alloc_cluster is only used in ssd mode */
1565 struct btrfs_free_cluster data_alloc_cluster;
1567 /* all metadata allocations go through this cluster */
1568 struct btrfs_free_cluster meta_alloc_cluster;
1570 /* auto defrag inodes go here */
1571 spinlock_t defrag_inodes_lock;
1572 struct rb_root defrag_inodes;
1573 atomic_t defrag_running;
1575 /* Used to protect avail_{data, metadata, system}_alloc_bits */
1576 seqlock_t profiles_lock;
1578 * these three are in extended format (availability of single
1579 * chunks is denoted by BTRFS_AVAIL_ALLOC_BIT_SINGLE bit, other
1580 * types are denoted by corresponding BTRFS_BLOCK_GROUP_* bits)
1582 u64 avail_data_alloc_bits;
1583 u64 avail_metadata_alloc_bits;
1584 u64 avail_system_alloc_bits;
1586 /* restriper state */
1587 spinlock_t balance_lock;
1588 struct mutex balance_mutex;
1589 atomic_t balance_running;
1590 atomic_t balance_pause_req;
1591 atomic_t balance_cancel_req;
1592 struct btrfs_balance_control *balance_ctl;
1593 wait_queue_head_t balance_wait_q;
1595 unsigned data_chunk_allocations;
1596 unsigned metadata_ratio;
1600 /* private scrub information */
1601 struct mutex scrub_lock;
1602 atomic_t scrubs_running;
1603 atomic_t scrub_pause_req;
1604 atomic_t scrubs_paused;
1605 atomic_t scrub_cancel_req;
1606 wait_queue_head_t scrub_pause_wait;
1607 int scrub_workers_refcnt;
1608 struct btrfs_workqueue *scrub_workers;
1609 struct btrfs_workqueue *scrub_wr_completion_workers;
1610 struct btrfs_workqueue *scrub_nocow_workers;
1612 #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY
1613 u32 check_integrity_print_mask;
1618 unsigned int quota_enabled:1;
1621 * quota_enabled only changes state after a commit. This holds the
1624 unsigned int pending_quota_state:1;
1626 /* is qgroup tracking in a consistent state? */
1629 /* holds configuration and tracking. Protected by qgroup_lock */
1630 struct rb_root qgroup_tree;
1631 spinlock_t qgroup_lock;
1634 * used to avoid frequently calling ulist_alloc()/ulist_free()
1635 * when doing qgroup accounting, it must be protected by qgroup_lock.
1637 struct ulist *qgroup_ulist;
1639 /* protect user change for quota operations */
1640 struct mutex qgroup_ioctl_lock;
1642 /* list of dirty qgroups to be written at next commit */
1643 struct list_head dirty_qgroups;
1645 /* used by btrfs_qgroup_record_ref for an efficient tree traversal */
1648 /* qgroup rescan items */
1649 struct mutex qgroup_rescan_lock; /* protects the progress item */
1650 struct btrfs_key qgroup_rescan_progress;
1651 struct btrfs_workqueue *qgroup_rescan_workers;
1652 struct completion qgroup_rescan_completion;
1653 struct btrfs_work qgroup_rescan_work;
1655 /* filesystem state */
1656 unsigned long fs_state;
1658 struct btrfs_delayed_root *delayed_root;
1660 /* readahead tree */
1661 spinlock_t reada_lock;
1662 struct radix_tree_root reada_tree;
1664 /* Extent buffer radix tree */
1665 spinlock_t buffer_lock;
1666 struct radix_tree_root buffer_radix;
1668 /* next backup root to be overwritten */
1669 int backup_root_index;
1671 int num_tolerated_disk_barrier_failures;
1673 /* device replace state */
1674 struct btrfs_dev_replace dev_replace;
1676 atomic_t mutually_exclusive_operation_running;
1678 struct percpu_counter bio_counter;
1679 wait_queue_head_t replace_wait;
1681 struct semaphore uuid_tree_rescan_sem;
1682 unsigned int update_uuid_tree_gen:1;
1685 struct btrfs_subvolume_writers {
1686 struct percpu_counter counter;
1687 wait_queue_head_t wait;
1691 * in ram representation of the tree. extent_root is used for all allocations
1692 * and for the extent tree extent_root root.
1695 struct extent_buffer *node;
1697 struct extent_buffer *commit_root;
1698 struct btrfs_root *log_root;
1699 struct btrfs_root *reloc_root;
1701 struct btrfs_root_item root_item;
1702 struct btrfs_key root_key;
1703 struct btrfs_fs_info *fs_info;
1704 struct extent_io_tree dirty_log_pages;
1706 struct kobject root_kobj;
1707 struct completion kobj_unregister;
1708 struct mutex objectid_mutex;
1710 spinlock_t accounting_lock;
1711 struct btrfs_block_rsv *block_rsv;
1713 /* free ino cache stuff */
1714 struct mutex fs_commit_mutex;
1715 struct btrfs_free_space_ctl *free_ino_ctl;
1716 enum btrfs_caching_type cached;
1717 spinlock_t cache_lock;
1718 wait_queue_head_t cache_wait;
1719 struct btrfs_free_space_ctl *free_ino_pinned;
1721 struct inode *cache_inode;
1723 struct mutex log_mutex;
1724 wait_queue_head_t log_writer_wait;
1725 wait_queue_head_t log_commit_wait[2];
1726 struct list_head log_ctxs[2];
1727 atomic_t log_writers;
1728 atomic_t log_commit[2];
1731 /* No matter the commit succeeds or not*/
1732 int log_transid_committed;
1733 /* Just be updated when the commit succeeds. */
1734 int last_log_commit;
1735 pid_t log_start_pid;
1736 bool log_multiple_pids;
1741 /* data allocations are done in sectorsize units */
1744 /* node allocations are done in nodesize units */
1747 /* leaf allocations are done in leafsize units */
1754 u64 highest_objectid;
1756 /* btrfs_record_root_in_trans is a multi-step process,
1757 * and it can race with the balancing code. But the
1758 * race is very small, and only the first time the root
1759 * is added to each transaction. So in_trans_setup
1760 * is used to tell us when more checks are required
1762 unsigned long in_trans_setup;
1766 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
1769 u64 defrag_trans_start;
1770 struct btrfs_key defrag_progress;
1771 struct btrfs_key defrag_max;
1775 /* the dirty list is only used by non-reference counted roots */
1776 struct list_head dirty_list;
1778 struct list_head root_list;
1780 spinlock_t log_extents_lock[2];
1781 struct list_head logged_list[2];
1783 spinlock_t orphan_lock;
1784 atomic_t orphan_inodes;
1785 struct btrfs_block_rsv *orphan_block_rsv;
1786 int orphan_item_inserted;
1787 int orphan_cleanup_state;
1789 spinlock_t inode_lock;
1790 /* red-black tree that keeps track of in-memory inodes */
1791 struct rb_root inode_tree;
1794 * radix tree that keeps track of delayed nodes of every inode,
1795 * protected by inode_lock
1797 struct radix_tree_root delayed_nodes_tree;
1799 * right now this just gets used so that a root has its own devid
1800 * for stat. It may be used for more later
1806 spinlock_t root_item_lock;
1809 struct mutex delalloc_mutex;
1810 spinlock_t delalloc_lock;
1812 * all of the inodes that have delalloc bytes. It is possible for
1813 * this list to be empty even when there is still dirty data=ordered
1814 * extents waiting to finish IO.
1816 struct list_head delalloc_inodes;
1817 struct list_head delalloc_root;
1818 u64 nr_delalloc_inodes;
1820 struct mutex ordered_extent_mutex;
1822 * this is used by the balancing code to wait for all the pending
1825 spinlock_t ordered_extent_lock;
1828 * all of the data=ordered extents pending writeback
1829 * these can span multiple transactions and basically include
1830 * every dirty data page that isn't from nodatacow
1832 struct list_head ordered_extents;
1833 struct list_head ordered_root;
1834 u64 nr_ordered_extents;
1837 * Number of currently running SEND ioctls to prevent
1838 * manipulation with the read-only status via SUBVOL_SETFLAGS
1840 int send_in_progress;
1841 struct btrfs_subvolume_writers *subv_writers;
1842 atomic_t will_be_snapshoted;
1845 struct btrfs_ioctl_defrag_range_args {
1846 /* start of the defrag operation */
1849 /* number of bytes to defrag, use (u64)-1 to say all */
1853 * flags for the operation, which can include turning
1854 * on compression for this one defrag
1859 * any extent bigger than this will be considered
1860 * already defragged. Use 0 to take the kernel default
1861 * Use 1 to say every single extent must be rewritten
1863 __u32 extent_thresh;
1866 * which compression method to use if turning on compression
1867 * for this defrag operation. If unspecified, zlib will
1870 __u32 compress_type;
1872 /* spare for later */
1878 * inode items have the data typically returned from stat and store other
1879 * info about object characteristics. There is one for every file and dir in
1882 #define BTRFS_INODE_ITEM_KEY 1
1883 #define BTRFS_INODE_REF_KEY 12
1884 #define BTRFS_INODE_EXTREF_KEY 13
1885 #define BTRFS_XATTR_ITEM_KEY 24
1886 #define BTRFS_ORPHAN_ITEM_KEY 48
1887 /* reserve 2-15 close to the inode for later flexibility */
1890 * dir items are the name -> inode pointers in a directory. There is one
1891 * for every name in a directory.
1893 #define BTRFS_DIR_LOG_ITEM_KEY 60
1894 #define BTRFS_DIR_LOG_INDEX_KEY 72
1895 #define BTRFS_DIR_ITEM_KEY 84
1896 #define BTRFS_DIR_INDEX_KEY 96
1898 * extent data is for file data
1900 #define BTRFS_EXTENT_DATA_KEY 108
1903 * extent csums are stored in a separate tree and hold csums for
1904 * an entire extent on disk.
1906 #define BTRFS_EXTENT_CSUM_KEY 128
1909 * root items point to tree roots. They are typically in the root
1910 * tree used by the super block to find all the other trees
1912 #define BTRFS_ROOT_ITEM_KEY 132
1915 * root backrefs tie subvols and snapshots to the directory entries that
1918 #define BTRFS_ROOT_BACKREF_KEY 144
1921 * root refs make a fast index for listing all of the snapshots and
1922 * subvolumes referenced by a given root. They point directly to the
1923 * directory item in the root that references the subvol
1925 #define BTRFS_ROOT_REF_KEY 156
1928 * extent items are in the extent map tree. These record which blocks
1929 * are used, and how many references there are to each block
1931 #define BTRFS_EXTENT_ITEM_KEY 168
1934 * The same as the BTRFS_EXTENT_ITEM_KEY, except it's metadata we already know
1935 * the length, so we save the level in key->offset instead of the length.
1937 #define BTRFS_METADATA_ITEM_KEY 169
1939 #define BTRFS_TREE_BLOCK_REF_KEY 176
1941 #define BTRFS_EXTENT_DATA_REF_KEY 178
1943 #define BTRFS_EXTENT_REF_V0_KEY 180
1945 #define BTRFS_SHARED_BLOCK_REF_KEY 182
1947 #define BTRFS_SHARED_DATA_REF_KEY 184
1950 * block groups give us hints into the extent allocation trees. Which
1951 * blocks are free etc etc
1953 #define BTRFS_BLOCK_GROUP_ITEM_KEY 192
1955 #define BTRFS_DEV_EXTENT_KEY 204
1956 #define BTRFS_DEV_ITEM_KEY 216
1957 #define BTRFS_CHUNK_ITEM_KEY 228
1960 * Records the overall state of the qgroups.
1961 * There's only one instance of this key present,
1962 * (0, BTRFS_QGROUP_STATUS_KEY, 0)
1964 #define BTRFS_QGROUP_STATUS_KEY 240
1966 * Records the currently used space of the qgroup.
1967 * One key per qgroup, (0, BTRFS_QGROUP_INFO_KEY, qgroupid).
1969 #define BTRFS_QGROUP_INFO_KEY 242
1971 * Contains the user configured limits for the qgroup.
1972 * One key per qgroup, (0, BTRFS_QGROUP_LIMIT_KEY, qgroupid).
1974 #define BTRFS_QGROUP_LIMIT_KEY 244
1976 * Records the child-parent relationship of qgroups. For
1977 * each relation, 2 keys are present:
1978 * (childid, BTRFS_QGROUP_RELATION_KEY, parentid)
1979 * (parentid, BTRFS_QGROUP_RELATION_KEY, childid)
1981 #define BTRFS_QGROUP_RELATION_KEY 246
1983 #define BTRFS_BALANCE_ITEM_KEY 248
1986 * Persistantly stores the io stats in the device tree.
1987 * One key for all stats, (0, BTRFS_DEV_STATS_KEY, devid).
1989 #define BTRFS_DEV_STATS_KEY 249
1992 * Persistantly stores the device replace state in the device tree.
1993 * The key is built like this: (0, BTRFS_DEV_REPLACE_KEY, 0).
1995 #define BTRFS_DEV_REPLACE_KEY 250
1998 * Stores items that allow to quickly map UUIDs to something else.
1999 * These items are part of the filesystem UUID tree.
2000 * The key is built like this:
2001 * (UUID_upper_64_bits, BTRFS_UUID_KEY*, UUID_lower_64_bits).
2003 #if BTRFS_UUID_SIZE != 16
2004 #error "UUID items require BTRFS_UUID_SIZE == 16!"
2006 #define BTRFS_UUID_KEY_SUBVOL 251 /* for UUIDs assigned to subvols */
2007 #define BTRFS_UUID_KEY_RECEIVED_SUBVOL 252 /* for UUIDs assigned to
2008 * received subvols */
2011 * string items are for debugging. They just store a short string of
2014 #define BTRFS_STRING_ITEM_KEY 253
2017 * Flags for mount options.
2019 * Note: don't forget to add new options to btrfs_show_options()
2021 #define BTRFS_MOUNT_NODATASUM (1 << 0)
2022 #define BTRFS_MOUNT_NODATACOW (1 << 1)
2023 #define BTRFS_MOUNT_NOBARRIER (1 << 2)
2024 #define BTRFS_MOUNT_SSD (1 << 3)
2025 #define BTRFS_MOUNT_DEGRADED (1 << 4)
2026 #define BTRFS_MOUNT_COMPRESS (1 << 5)
2027 #define BTRFS_MOUNT_NOTREELOG (1 << 6)
2028 #define BTRFS_MOUNT_FLUSHONCOMMIT (1 << 7)
2029 #define BTRFS_MOUNT_SSD_SPREAD (1 << 8)
2030 #define BTRFS_MOUNT_NOSSD (1 << 9)
2031 #define BTRFS_MOUNT_DISCARD (1 << 10)
2032 #define BTRFS_MOUNT_FORCE_COMPRESS (1 << 11)
2033 #define BTRFS_MOUNT_SPACE_CACHE (1 << 12)
2034 #define BTRFS_MOUNT_CLEAR_CACHE (1 << 13)
2035 #define BTRFS_MOUNT_USER_SUBVOL_RM_ALLOWED (1 << 14)
2036 #define BTRFS_MOUNT_ENOSPC_DEBUG (1 << 15)
2037 #define BTRFS_MOUNT_AUTO_DEFRAG (1 << 16)
2038 #define BTRFS_MOUNT_INODE_MAP_CACHE (1 << 17)
2039 #define BTRFS_MOUNT_RECOVERY (1 << 18)
2040 #define BTRFS_MOUNT_SKIP_BALANCE (1 << 19)
2041 #define BTRFS_MOUNT_CHECK_INTEGRITY (1 << 20)
2042 #define BTRFS_MOUNT_CHECK_INTEGRITY_INCLUDING_EXTENT_DATA (1 << 21)
2043 #define BTRFS_MOUNT_PANIC_ON_FATAL_ERROR (1 << 22)
2044 #define BTRFS_MOUNT_RESCAN_UUID_TREE (1 << 23)
2045 #define BTRFS_MOUNT_CHANGE_INODE_CACHE (1 << 24)
2047 #define BTRFS_DEFAULT_COMMIT_INTERVAL (30)
2049 #define btrfs_clear_opt(o, opt) ((o) &= ~BTRFS_MOUNT_##opt)
2050 #define btrfs_set_opt(o, opt) ((o) |= BTRFS_MOUNT_##opt)
2051 #define btrfs_raw_test_opt(o, opt) ((o) & BTRFS_MOUNT_##opt)
2052 #define btrfs_test_opt(root, opt) ((root)->fs_info->mount_opt & \
2057 #define BTRFS_INODE_NODATASUM (1 << 0)
2058 #define BTRFS_INODE_NODATACOW (1 << 1)
2059 #define BTRFS_INODE_READONLY (1 << 2)
2060 #define BTRFS_INODE_NOCOMPRESS (1 << 3)
2061 #define BTRFS_INODE_PREALLOC (1 << 4)
2062 #define BTRFS_INODE_SYNC (1 << 5)
2063 #define BTRFS_INODE_IMMUTABLE (1 << 6)
2064 #define BTRFS_INODE_APPEND (1 << 7)
2065 #define BTRFS_INODE_NODUMP (1 << 8)
2066 #define BTRFS_INODE_NOATIME (1 << 9)
2067 #define BTRFS_INODE_DIRSYNC (1 << 10)
2068 #define BTRFS_INODE_COMPRESS (1 << 11)
2070 #define BTRFS_INODE_ROOT_ITEM_INIT (1 << 31)
2072 struct btrfs_map_token {
2073 struct extent_buffer *eb;
2075 unsigned long offset;
2078 static inline void btrfs_init_map_token (struct btrfs_map_token *token)
2080 token->kaddr = NULL;
2083 /* some macros to generate set/get funcs for the struct fields. This
2084 * assumes there is a lefoo_to_cpu for every type, so lets make a simple
2087 #define le8_to_cpu(v) (v)
2088 #define cpu_to_le8(v) (v)
2091 #define read_eb_member(eb, ptr, type, member, result) ( \
2092 read_extent_buffer(eb, (char *)(result), \
2093 ((unsigned long)(ptr)) + \
2094 offsetof(type, member), \
2095 sizeof(((type *)0)->member)))
2097 #define write_eb_member(eb, ptr, type, member, result) ( \
2098 write_extent_buffer(eb, (char *)(result), \
2099 ((unsigned long)(ptr)) + \
2100 offsetof(type, member), \
2101 sizeof(((type *)0)->member)))
2103 #define DECLARE_BTRFS_SETGET_BITS(bits) \
2104 u##bits btrfs_get_token_##bits(struct extent_buffer *eb, void *ptr, \
2105 unsigned long off, \
2106 struct btrfs_map_token *token); \
2107 void btrfs_set_token_##bits(struct extent_buffer *eb, void *ptr, \
2108 unsigned long off, u##bits val, \
2109 struct btrfs_map_token *token); \
2110 static inline u##bits btrfs_get_##bits(struct extent_buffer *eb, void *ptr, \
2111 unsigned long off) \
2113 return btrfs_get_token_##bits(eb, ptr, off, NULL); \
2115 static inline void btrfs_set_##bits(struct extent_buffer *eb, void *ptr, \
2116 unsigned long off, u##bits val) \
2118 btrfs_set_token_##bits(eb, ptr, off, val, NULL); \
2121 DECLARE_BTRFS_SETGET_BITS(8)
2122 DECLARE_BTRFS_SETGET_BITS(16)
2123 DECLARE_BTRFS_SETGET_BITS(32)
2124 DECLARE_BTRFS_SETGET_BITS(64)
2126 #define BTRFS_SETGET_FUNCS(name, type, member, bits) \
2127 static inline u##bits btrfs_##name(struct extent_buffer *eb, type *s) \
2129 BUILD_BUG_ON(sizeof(u##bits) != sizeof(((type *)0))->member); \
2130 return btrfs_get_##bits(eb, s, offsetof(type, member)); \
2132 static inline void btrfs_set_##name(struct extent_buffer *eb, type *s, \
2135 BUILD_BUG_ON(sizeof(u##bits) != sizeof(((type *)0))->member); \
2136 btrfs_set_##bits(eb, s, offsetof(type, member), val); \
2138 static inline u##bits btrfs_token_##name(struct extent_buffer *eb, type *s, \
2139 struct btrfs_map_token *token) \
2141 BUILD_BUG_ON(sizeof(u##bits) != sizeof(((type *)0))->member); \
2142 return btrfs_get_token_##bits(eb, s, offsetof(type, member), token); \
2144 static inline void btrfs_set_token_##name(struct extent_buffer *eb, \
2145 type *s, u##bits val, \
2146 struct btrfs_map_token *token) \
2148 BUILD_BUG_ON(sizeof(u##bits) != sizeof(((type *)0))->member); \
2149 btrfs_set_token_##bits(eb, s, offsetof(type, member), val, token); \
2152 #define BTRFS_SETGET_HEADER_FUNCS(name, type, member, bits) \
2153 static inline u##bits btrfs_##name(struct extent_buffer *eb) \
2155 type *p = page_address(eb->pages[0]); \
2156 u##bits res = le##bits##_to_cpu(p->member); \
2159 static inline void btrfs_set_##name(struct extent_buffer *eb, \
2162 type *p = page_address(eb->pages[0]); \
2163 p->member = cpu_to_le##bits(val); \
2166 #define BTRFS_SETGET_STACK_FUNCS(name, type, member, bits) \
2167 static inline u##bits btrfs_##name(type *s) \
2169 return le##bits##_to_cpu(s->member); \
2171 static inline void btrfs_set_##name(type *s, u##bits val) \
2173 s->member = cpu_to_le##bits(val); \
2176 BTRFS_SETGET_FUNCS(device_type, struct btrfs_dev_item, type, 64);
2177 BTRFS_SETGET_FUNCS(device_total_bytes, struct btrfs_dev_item, total_bytes, 64);
2178 BTRFS_SETGET_FUNCS(device_bytes_used, struct btrfs_dev_item, bytes_used, 64);
2179 BTRFS_SETGET_FUNCS(device_io_align, struct btrfs_dev_item, io_align, 32);
2180 BTRFS_SETGET_FUNCS(device_io_width, struct btrfs_dev_item, io_width, 32);
2181 BTRFS_SETGET_FUNCS(device_start_offset, struct btrfs_dev_item,
2183 BTRFS_SETGET_FUNCS(device_sector_size, struct btrfs_dev_item, sector_size, 32);
2184 BTRFS_SETGET_FUNCS(device_id, struct btrfs_dev_item, devid, 64);
2185 BTRFS_SETGET_FUNCS(device_group, struct btrfs_dev_item, dev_group, 32);
2186 BTRFS_SETGET_FUNCS(device_seek_speed, struct btrfs_dev_item, seek_speed, 8);
2187 BTRFS_SETGET_FUNCS(device_bandwidth, struct btrfs_dev_item, bandwidth, 8);
2188 BTRFS_SETGET_FUNCS(device_generation, struct btrfs_dev_item, generation, 64);
2190 BTRFS_SETGET_STACK_FUNCS(stack_device_type, struct btrfs_dev_item, type, 64);
2191 BTRFS_SETGET_STACK_FUNCS(stack_device_total_bytes, struct btrfs_dev_item,
2193 BTRFS_SETGET_STACK_FUNCS(stack_device_bytes_used, struct btrfs_dev_item,
2195 BTRFS_SETGET_STACK_FUNCS(stack_device_io_align, struct btrfs_dev_item,
2197 BTRFS_SETGET_STACK_FUNCS(stack_device_io_width, struct btrfs_dev_item,
2199 BTRFS_SETGET_STACK_FUNCS(stack_device_sector_size, struct btrfs_dev_item,
2201 BTRFS_SETGET_STACK_FUNCS(stack_device_id, struct btrfs_dev_item, devid, 64);
2202 BTRFS_SETGET_STACK_FUNCS(stack_device_group, struct btrfs_dev_item,
2204 BTRFS_SETGET_STACK_FUNCS(stack_device_seek_speed, struct btrfs_dev_item,
2206 BTRFS_SETGET_STACK_FUNCS(stack_device_bandwidth, struct btrfs_dev_item,
2208 BTRFS_SETGET_STACK_FUNCS(stack_device_generation, struct btrfs_dev_item,
2211 static inline unsigned long btrfs_device_uuid(struct btrfs_dev_item *d)
2213 return (unsigned long)d + offsetof(struct btrfs_dev_item, uuid);
2216 static inline unsigned long btrfs_device_fsid(struct btrfs_dev_item *d)
2218 return (unsigned long)d + offsetof(struct btrfs_dev_item, fsid);
2221 BTRFS_SETGET_FUNCS(chunk_length, struct btrfs_chunk, length, 64);
2222 BTRFS_SETGET_FUNCS(chunk_owner, struct btrfs_chunk, owner, 64);
2223 BTRFS_SETGET_FUNCS(chunk_stripe_len, struct btrfs_chunk, stripe_len, 64);
2224 BTRFS_SETGET_FUNCS(chunk_io_align, struct btrfs_chunk, io_align, 32);
2225 BTRFS_SETGET_FUNCS(chunk_io_width, struct btrfs_chunk, io_width, 32);
2226 BTRFS_SETGET_FUNCS(chunk_sector_size, struct btrfs_chunk, sector_size, 32);
2227 BTRFS_SETGET_FUNCS(chunk_type, struct btrfs_chunk, type, 64);
2228 BTRFS_SETGET_FUNCS(chunk_num_stripes, struct btrfs_chunk, num_stripes, 16);
2229 BTRFS_SETGET_FUNCS(chunk_sub_stripes, struct btrfs_chunk, sub_stripes, 16);
2230 BTRFS_SETGET_FUNCS(stripe_devid, struct btrfs_stripe, devid, 64);
2231 BTRFS_SETGET_FUNCS(stripe_offset, struct btrfs_stripe, offset, 64);
2233 static inline char *btrfs_stripe_dev_uuid(struct btrfs_stripe *s)
2235 return (char *)s + offsetof(struct btrfs_stripe, dev_uuid);
2238 BTRFS_SETGET_STACK_FUNCS(stack_chunk_length, struct btrfs_chunk, length, 64);
2239 BTRFS_SETGET_STACK_FUNCS(stack_chunk_owner, struct btrfs_chunk, owner, 64);
2240 BTRFS_SETGET_STACK_FUNCS(stack_chunk_stripe_len, struct btrfs_chunk,
2242 BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_align, struct btrfs_chunk,
2244 BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_width, struct btrfs_chunk,
2246 BTRFS_SETGET_STACK_FUNCS(stack_chunk_sector_size, struct btrfs_chunk,
2248 BTRFS_SETGET_STACK_FUNCS(stack_chunk_type, struct btrfs_chunk, type, 64);
2249 BTRFS_SETGET_STACK_FUNCS(stack_chunk_num_stripes, struct btrfs_chunk,
2251 BTRFS_SETGET_STACK_FUNCS(stack_chunk_sub_stripes, struct btrfs_chunk,
2253 BTRFS_SETGET_STACK_FUNCS(stack_stripe_devid, struct btrfs_stripe, devid, 64);
2254 BTRFS_SETGET_STACK_FUNCS(stack_stripe_offset, struct btrfs_stripe, offset, 64);
2256 static inline struct btrfs_stripe *btrfs_stripe_nr(struct btrfs_chunk *c,
2259 unsigned long offset = (unsigned long)c;
2260 offset += offsetof(struct btrfs_chunk, stripe);
2261 offset += nr * sizeof(struct btrfs_stripe);
2262 return (struct btrfs_stripe *)offset;
2265 static inline char *btrfs_stripe_dev_uuid_nr(struct btrfs_chunk *c, int nr)
2267 return btrfs_stripe_dev_uuid(btrfs_stripe_nr(c, nr));
2270 static inline u64 btrfs_stripe_offset_nr(struct extent_buffer *eb,
2271 struct btrfs_chunk *c, int nr)
2273 return btrfs_stripe_offset(eb, btrfs_stripe_nr(c, nr));
2276 static inline u64 btrfs_stripe_devid_nr(struct extent_buffer *eb,
2277 struct btrfs_chunk *c, int nr)
2279 return btrfs_stripe_devid(eb, btrfs_stripe_nr(c, nr));
2282 /* struct btrfs_block_group_item */
2283 BTRFS_SETGET_STACK_FUNCS(block_group_used, struct btrfs_block_group_item,
2285 BTRFS_SETGET_FUNCS(disk_block_group_used, struct btrfs_block_group_item,
2287 BTRFS_SETGET_STACK_FUNCS(block_group_chunk_objectid,
2288 struct btrfs_block_group_item, chunk_objectid, 64);
2290 BTRFS_SETGET_FUNCS(disk_block_group_chunk_objectid,
2291 struct btrfs_block_group_item, chunk_objectid, 64);
2292 BTRFS_SETGET_FUNCS(disk_block_group_flags,
2293 struct btrfs_block_group_item, flags, 64);
2294 BTRFS_SETGET_STACK_FUNCS(block_group_flags,
2295 struct btrfs_block_group_item, flags, 64);
2297 /* struct btrfs_inode_ref */
2298 BTRFS_SETGET_FUNCS(inode_ref_name_len, struct btrfs_inode_ref, name_len, 16);
2299 BTRFS_SETGET_FUNCS(inode_ref_index, struct btrfs_inode_ref, index, 64);
2301 /* struct btrfs_inode_extref */
2302 BTRFS_SETGET_FUNCS(inode_extref_parent, struct btrfs_inode_extref,
2303 parent_objectid, 64);
2304 BTRFS_SETGET_FUNCS(inode_extref_name_len, struct btrfs_inode_extref,
2306 BTRFS_SETGET_FUNCS(inode_extref_index, struct btrfs_inode_extref, index, 64);
2308 /* struct btrfs_inode_item */
2309 BTRFS_SETGET_FUNCS(inode_generation, struct btrfs_inode_item, generation, 64);
2310 BTRFS_SETGET_FUNCS(inode_sequence, struct btrfs_inode_item, sequence, 64);
2311 BTRFS_SETGET_FUNCS(inode_transid, struct btrfs_inode_item, transid, 64);
2312 BTRFS_SETGET_FUNCS(inode_size, struct btrfs_inode_item, size, 64);
2313 BTRFS_SETGET_FUNCS(inode_nbytes, struct btrfs_inode_item, nbytes, 64);
2314 BTRFS_SETGET_FUNCS(inode_block_group, struct btrfs_inode_item, block_group, 64);
2315 BTRFS_SETGET_FUNCS(inode_nlink, struct btrfs_inode_item, nlink, 32);
2316 BTRFS_SETGET_FUNCS(inode_uid, struct btrfs_inode_item, uid, 32);
2317 BTRFS_SETGET_FUNCS(inode_gid, struct btrfs_inode_item, gid, 32);
2318 BTRFS_SETGET_FUNCS(inode_mode, struct btrfs_inode_item, mode, 32);
2319 BTRFS_SETGET_FUNCS(inode_rdev, struct btrfs_inode_item, rdev, 64);
2320 BTRFS_SETGET_FUNCS(inode_flags, struct btrfs_inode_item, flags, 64);
2321 BTRFS_SETGET_STACK_FUNCS(stack_inode_generation, struct btrfs_inode_item,
2323 BTRFS_SETGET_STACK_FUNCS(stack_inode_sequence, struct btrfs_inode_item,
2325 BTRFS_SETGET_STACK_FUNCS(stack_inode_transid, struct btrfs_inode_item,
2327 BTRFS_SETGET_STACK_FUNCS(stack_inode_size, struct btrfs_inode_item, size, 64);
2328 BTRFS_SETGET_STACK_FUNCS(stack_inode_nbytes, struct btrfs_inode_item,
2330 BTRFS_SETGET_STACK_FUNCS(stack_inode_block_group, struct btrfs_inode_item,
2332 BTRFS_SETGET_STACK_FUNCS(stack_inode_nlink, struct btrfs_inode_item, nlink, 32);
2333 BTRFS_SETGET_STACK_FUNCS(stack_inode_uid, struct btrfs_inode_item, uid, 32);
2334 BTRFS_SETGET_STACK_FUNCS(stack_inode_gid, struct btrfs_inode_item, gid, 32);
2335 BTRFS_SETGET_STACK_FUNCS(stack_inode_mode, struct btrfs_inode_item, mode, 32);
2336 BTRFS_SETGET_STACK_FUNCS(stack_inode_rdev, struct btrfs_inode_item, rdev, 64);
2337 BTRFS_SETGET_STACK_FUNCS(stack_inode_flags, struct btrfs_inode_item, flags, 64);
2339 static inline struct btrfs_timespec *
2340 btrfs_inode_atime(struct btrfs_inode_item *inode_item)
2342 unsigned long ptr = (unsigned long)inode_item;
2343 ptr += offsetof(struct btrfs_inode_item, atime);
2344 return (struct btrfs_timespec *)ptr;
2347 static inline struct btrfs_timespec *
2348 btrfs_inode_mtime(struct btrfs_inode_item *inode_item)
2350 unsigned long ptr = (unsigned long)inode_item;
2351 ptr += offsetof(struct btrfs_inode_item, mtime);
2352 return (struct btrfs_timespec *)ptr;
2355 static inline struct btrfs_timespec *
2356 btrfs_inode_ctime(struct btrfs_inode_item *inode_item)
2358 unsigned long ptr = (unsigned long)inode_item;
2359 ptr += offsetof(struct btrfs_inode_item, ctime);
2360 return (struct btrfs_timespec *)ptr;
2363 BTRFS_SETGET_FUNCS(timespec_sec, struct btrfs_timespec, sec, 64);
2364 BTRFS_SETGET_FUNCS(timespec_nsec, struct btrfs_timespec, nsec, 32);
2365 BTRFS_SETGET_STACK_FUNCS(stack_timespec_sec, struct btrfs_timespec, sec, 64);
2366 BTRFS_SETGET_STACK_FUNCS(stack_timespec_nsec, struct btrfs_timespec, nsec, 32);
2368 /* struct btrfs_dev_extent */
2369 BTRFS_SETGET_FUNCS(dev_extent_chunk_tree, struct btrfs_dev_extent,
2371 BTRFS_SETGET_FUNCS(dev_extent_chunk_objectid, struct btrfs_dev_extent,
2372 chunk_objectid, 64);
2373 BTRFS_SETGET_FUNCS(dev_extent_chunk_offset, struct btrfs_dev_extent,
2375 BTRFS_SETGET_FUNCS(dev_extent_length, struct btrfs_dev_extent, length, 64);
2377 static inline unsigned long btrfs_dev_extent_chunk_tree_uuid(struct btrfs_dev_extent *dev)
2379 unsigned long ptr = offsetof(struct btrfs_dev_extent, chunk_tree_uuid);
2380 return (unsigned long)dev + ptr;
2383 BTRFS_SETGET_FUNCS(extent_refs, struct btrfs_extent_item, refs, 64);
2384 BTRFS_SETGET_FUNCS(extent_generation, struct btrfs_extent_item,
2386 BTRFS_SETGET_FUNCS(extent_flags, struct btrfs_extent_item, flags, 64);
2388 BTRFS_SETGET_FUNCS(extent_refs_v0, struct btrfs_extent_item_v0, refs, 32);
2391 BTRFS_SETGET_FUNCS(tree_block_level, struct btrfs_tree_block_info, level, 8);
2393 static inline void btrfs_tree_block_key(struct extent_buffer *eb,
2394 struct btrfs_tree_block_info *item,
2395 struct btrfs_disk_key *key)
2397 read_eb_member(eb, item, struct btrfs_tree_block_info, key, key);
2400 static inline void btrfs_set_tree_block_key(struct extent_buffer *eb,
2401 struct btrfs_tree_block_info *item,
2402 struct btrfs_disk_key *key)
2404 write_eb_member(eb, item, struct btrfs_tree_block_info, key, key);
2407 BTRFS_SETGET_FUNCS(extent_data_ref_root, struct btrfs_extent_data_ref,
2409 BTRFS_SETGET_FUNCS(extent_data_ref_objectid, struct btrfs_extent_data_ref,
2411 BTRFS_SETGET_FUNCS(extent_data_ref_offset, struct btrfs_extent_data_ref,
2413 BTRFS_SETGET_FUNCS(extent_data_ref_count, struct btrfs_extent_data_ref,
2416 BTRFS_SETGET_FUNCS(shared_data_ref_count, struct btrfs_shared_data_ref,
2419 BTRFS_SETGET_FUNCS(extent_inline_ref_type, struct btrfs_extent_inline_ref,
2421 BTRFS_SETGET_FUNCS(extent_inline_ref_offset, struct btrfs_extent_inline_ref,
2424 static inline u32 btrfs_extent_inline_ref_size(int type)
2426 if (type == BTRFS_TREE_BLOCK_REF_KEY ||
2427 type == BTRFS_SHARED_BLOCK_REF_KEY)
2428 return sizeof(struct btrfs_extent_inline_ref);
2429 if (type == BTRFS_SHARED_DATA_REF_KEY)
2430 return sizeof(struct btrfs_shared_data_ref) +
2431 sizeof(struct btrfs_extent_inline_ref);
2432 if (type == BTRFS_EXTENT_DATA_REF_KEY)
2433 return sizeof(struct btrfs_extent_data_ref) +
2434 offsetof(struct btrfs_extent_inline_ref, offset);
2439 BTRFS_SETGET_FUNCS(ref_root_v0, struct btrfs_extent_ref_v0, root, 64);
2440 BTRFS_SETGET_FUNCS(ref_generation_v0, struct btrfs_extent_ref_v0,
2442 BTRFS_SETGET_FUNCS(ref_objectid_v0, struct btrfs_extent_ref_v0, objectid, 64);
2443 BTRFS_SETGET_FUNCS(ref_count_v0, struct btrfs_extent_ref_v0, count, 32);
2445 /* struct btrfs_node */
2446 BTRFS_SETGET_FUNCS(key_blockptr, struct btrfs_key_ptr, blockptr, 64);
2447 BTRFS_SETGET_FUNCS(key_generation, struct btrfs_key_ptr, generation, 64);
2448 BTRFS_SETGET_STACK_FUNCS(stack_key_blockptr, struct btrfs_key_ptr,
2450 BTRFS_SETGET_STACK_FUNCS(stack_key_generation, struct btrfs_key_ptr,
2453 static inline u64 btrfs_node_blockptr(struct extent_buffer *eb, int nr)
2456 ptr = offsetof(struct btrfs_node, ptrs) +
2457 sizeof(struct btrfs_key_ptr) * nr;
2458 return btrfs_key_blockptr(eb, (struct btrfs_key_ptr *)ptr);
2461 static inline void btrfs_set_node_blockptr(struct extent_buffer *eb,
2465 ptr = offsetof(struct btrfs_node, ptrs) +
2466 sizeof(struct btrfs_key_ptr) * nr;
2467 btrfs_set_key_blockptr(eb, (struct btrfs_key_ptr *)ptr, val);
2470 static inline u64 btrfs_node_ptr_generation(struct extent_buffer *eb, int nr)
2473 ptr = offsetof(struct btrfs_node, ptrs) +
2474 sizeof(struct btrfs_key_ptr) * nr;
2475 return btrfs_key_generation(eb, (struct btrfs_key_ptr *)ptr);
2478 static inline void btrfs_set_node_ptr_generation(struct extent_buffer *eb,
2482 ptr = offsetof(struct btrfs_node, ptrs) +
2483 sizeof(struct btrfs_key_ptr) * nr;
2484 btrfs_set_key_generation(eb, (struct btrfs_key_ptr *)ptr, val);
2487 static inline unsigned long btrfs_node_key_ptr_offset(int nr)
2489 return offsetof(struct btrfs_node, ptrs) +
2490 sizeof(struct btrfs_key_ptr) * nr;
2493 void btrfs_node_key(struct extent_buffer *eb,
2494 struct btrfs_disk_key *disk_key, int nr);
2496 static inline void btrfs_set_node_key(struct extent_buffer *eb,
2497 struct btrfs_disk_key *disk_key, int nr)
2500 ptr = btrfs_node_key_ptr_offset(nr);
2501 write_eb_member(eb, (struct btrfs_key_ptr *)ptr,
2502 struct btrfs_key_ptr, key, disk_key);
2505 /* struct btrfs_item */
2506 BTRFS_SETGET_FUNCS(item_offset, struct btrfs_item, offset, 32);
2507 BTRFS_SETGET_FUNCS(item_size, struct btrfs_item, size, 32);
2508 BTRFS_SETGET_STACK_FUNCS(stack_item_offset, struct btrfs_item, offset, 32);
2509 BTRFS_SETGET_STACK_FUNCS(stack_item_size, struct btrfs_item, size, 32);
2511 static inline unsigned long btrfs_item_nr_offset(int nr)
2513 return offsetof(struct btrfs_leaf, items) +
2514 sizeof(struct btrfs_item) * nr;
2517 static inline struct btrfs_item *btrfs_item_nr(int nr)
2519 return (struct btrfs_item *)btrfs_item_nr_offset(nr);
2522 static inline u32 btrfs_item_end(struct extent_buffer *eb,
2523 struct btrfs_item *item)
2525 return btrfs_item_offset(eb, item) + btrfs_item_size(eb, item);
2528 static inline u32 btrfs_item_end_nr(struct extent_buffer *eb, int nr)
2530 return btrfs_item_end(eb, btrfs_item_nr(nr));
2533 static inline u32 btrfs_item_offset_nr(struct extent_buffer *eb, int nr)
2535 return btrfs_item_offset(eb, btrfs_item_nr(nr));
2538 static inline u32 btrfs_item_size_nr(struct extent_buffer *eb, int nr)
2540 return btrfs_item_size(eb, btrfs_item_nr(nr));
2543 static inline void btrfs_item_key(struct extent_buffer *eb,
2544 struct btrfs_disk_key *disk_key, int nr)
2546 struct btrfs_item *item = btrfs_item_nr(nr);
2547 read_eb_member(eb, item, struct btrfs_item, key, disk_key);
2550 static inline void btrfs_set_item_key(struct extent_buffer *eb,
2551 struct btrfs_disk_key *disk_key, int nr)
2553 struct btrfs_item *item = btrfs_item_nr(nr);
2554 write_eb_member(eb, item, struct btrfs_item, key, disk_key);
2557 BTRFS_SETGET_FUNCS(dir_log_end, struct btrfs_dir_log_item, end, 64);
2560 * struct btrfs_root_ref
2562 BTRFS_SETGET_FUNCS(root_ref_dirid, struct btrfs_root_ref, dirid, 64);
2563 BTRFS_SETGET_FUNCS(root_ref_sequence, struct btrfs_root_ref, sequence, 64);
2564 BTRFS_SETGET_FUNCS(root_ref_name_len, struct btrfs_root_ref, name_len, 16);
2566 /* struct btrfs_dir_item */
2567 BTRFS_SETGET_FUNCS(dir_data_len, struct btrfs_dir_item, data_len, 16);
2568 BTRFS_SETGET_FUNCS(dir_type, struct btrfs_dir_item, type, 8);
2569 BTRFS_SETGET_FUNCS(dir_name_len, struct btrfs_dir_item, name_len, 16);
2570 BTRFS_SETGET_FUNCS(dir_transid, struct btrfs_dir_item, transid, 64);
2571 BTRFS_SETGET_STACK_FUNCS(stack_dir_type, struct btrfs_dir_item, type, 8);
2572 BTRFS_SETGET_STACK_FUNCS(stack_dir_data_len, struct btrfs_dir_item,
2574 BTRFS_SETGET_STACK_FUNCS(stack_dir_name_len, struct btrfs_dir_item,
2576 BTRFS_SETGET_STACK_FUNCS(stack_dir_transid, struct btrfs_dir_item,
2579 static inline void btrfs_dir_item_key(struct extent_buffer *eb,
2580 struct btrfs_dir_item *item,
2581 struct btrfs_disk_key *key)
2583 read_eb_member(eb, item, struct btrfs_dir_item, location, key);
2586 static inline void btrfs_set_dir_item_key(struct extent_buffer *eb,
2587 struct btrfs_dir_item *item,
2588 struct btrfs_disk_key *key)
2590 write_eb_member(eb, item, struct btrfs_dir_item, location, key);
2593 BTRFS_SETGET_FUNCS(free_space_entries, struct btrfs_free_space_header,
2595 BTRFS_SETGET_FUNCS(free_space_bitmaps, struct btrfs_free_space_header,
2597 BTRFS_SETGET_FUNCS(free_space_generation, struct btrfs_free_space_header,
2600 static inline void btrfs_free_space_key(struct extent_buffer *eb,
2601 struct btrfs_free_space_header *h,
2602 struct btrfs_disk_key *key)
2604 read_eb_member(eb, h, struct btrfs_free_space_header, location, key);
2607 static inline void btrfs_set_free_space_key(struct extent_buffer *eb,
2608 struct btrfs_free_space_header *h,
2609 struct btrfs_disk_key *key)
2611 write_eb_member(eb, h, struct btrfs_free_space_header, location, key);
2614 /* struct btrfs_disk_key */
2615 BTRFS_SETGET_STACK_FUNCS(disk_key_objectid, struct btrfs_disk_key,
2617 BTRFS_SETGET_STACK_FUNCS(disk_key_offset, struct btrfs_disk_key, offset, 64);
2618 BTRFS_SETGET_STACK_FUNCS(disk_key_type, struct btrfs_disk_key, type, 8);
2620 static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu,
2621 struct btrfs_disk_key *disk)
2623 cpu->offset = le64_to_cpu(disk->offset);
2624 cpu->type = disk->type;
2625 cpu->objectid = le64_to_cpu(disk->objectid);
2628 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk,
2629 struct btrfs_key *cpu)
2631 disk->offset = cpu_to_le64(cpu->offset);
2632 disk->type = cpu->type;
2633 disk->objectid = cpu_to_le64(cpu->objectid);
2636 static inline void btrfs_node_key_to_cpu(struct extent_buffer *eb,
2637 struct btrfs_key *key, int nr)
2639 struct btrfs_disk_key disk_key;
2640 btrfs_node_key(eb, &disk_key, nr);
2641 btrfs_disk_key_to_cpu(key, &disk_key);
2644 static inline void btrfs_item_key_to_cpu(struct extent_buffer *eb,
2645 struct btrfs_key *key, int nr)
2647 struct btrfs_disk_key disk_key;
2648 btrfs_item_key(eb, &disk_key, nr);
2649 btrfs_disk_key_to_cpu(key, &disk_key);
2652 static inline void btrfs_dir_item_key_to_cpu(struct extent_buffer *eb,
2653 struct btrfs_dir_item *item,
2654 struct btrfs_key *key)
2656 struct btrfs_disk_key disk_key;
2657 btrfs_dir_item_key(eb, item, &disk_key);
2658 btrfs_disk_key_to_cpu(key, &disk_key);
2662 static inline u8 btrfs_key_type(struct btrfs_key *key)
2667 static inline void btrfs_set_key_type(struct btrfs_key *key, u8 val)
2672 /* struct btrfs_header */
2673 BTRFS_SETGET_HEADER_FUNCS(header_bytenr, struct btrfs_header, bytenr, 64);
2674 BTRFS_SETGET_HEADER_FUNCS(header_generation, struct btrfs_header,
2676 BTRFS_SETGET_HEADER_FUNCS(header_owner, struct btrfs_header, owner, 64);
2677 BTRFS_SETGET_HEADER_FUNCS(header_nritems, struct btrfs_header, nritems, 32);
2678 BTRFS_SETGET_HEADER_FUNCS(header_flags, struct btrfs_header, flags, 64);
2679 BTRFS_SETGET_HEADER_FUNCS(header_level, struct btrfs_header, level, 8);
2680 BTRFS_SETGET_STACK_FUNCS(stack_header_generation, struct btrfs_header,
2682 BTRFS_SETGET_STACK_FUNCS(stack_header_owner, struct btrfs_header, owner, 64);
2683 BTRFS_SETGET_STACK_FUNCS(stack_header_nritems, struct btrfs_header,
2685 BTRFS_SETGET_STACK_FUNCS(stack_header_bytenr, struct btrfs_header, bytenr, 64);
2687 static inline int btrfs_header_flag(struct extent_buffer *eb, u64 flag)
2689 return (btrfs_header_flags(eb) & flag) == flag;
2692 static inline int btrfs_set_header_flag(struct extent_buffer *eb, u64 flag)
2694 u64 flags = btrfs_header_flags(eb);
2695 btrfs_set_header_flags(eb, flags | flag);
2696 return (flags & flag) == flag;
2699 static inline int btrfs_clear_header_flag(struct extent_buffer *eb, u64 flag)
2701 u64 flags = btrfs_header_flags(eb);
2702 btrfs_set_header_flags(eb, flags & ~flag);
2703 return (flags & flag) == flag;
2706 static inline int btrfs_header_backref_rev(struct extent_buffer *eb)
2708 u64 flags = btrfs_header_flags(eb);
2709 return flags >> BTRFS_BACKREF_REV_SHIFT;
2712 static inline void btrfs_set_header_backref_rev(struct extent_buffer *eb,
2715 u64 flags = btrfs_header_flags(eb);
2716 flags &= ~BTRFS_BACKREF_REV_MASK;
2717 flags |= (u64)rev << BTRFS_BACKREF_REV_SHIFT;
2718 btrfs_set_header_flags(eb, flags);
2721 static inline unsigned long btrfs_header_fsid(void)
2723 return offsetof(struct btrfs_header, fsid);
2726 static inline unsigned long btrfs_header_chunk_tree_uuid(struct extent_buffer *eb)
2728 return offsetof(struct btrfs_header, chunk_tree_uuid);
2731 static inline int btrfs_is_leaf(struct extent_buffer *eb)
2733 return btrfs_header_level(eb) == 0;
2736 /* struct btrfs_root_item */
2737 BTRFS_SETGET_FUNCS(disk_root_generation, struct btrfs_root_item,
2739 BTRFS_SETGET_FUNCS(disk_root_refs, struct btrfs_root_item, refs, 32);
2740 BTRFS_SETGET_FUNCS(disk_root_bytenr, struct btrfs_root_item, bytenr, 64);
2741 BTRFS_SETGET_FUNCS(disk_root_level, struct btrfs_root_item, level, 8);
2743 BTRFS_SETGET_STACK_FUNCS(root_generation, struct btrfs_root_item,
2745 BTRFS_SETGET_STACK_FUNCS(root_bytenr, struct btrfs_root_item, bytenr, 64);
2746 BTRFS_SETGET_STACK_FUNCS(root_level, struct btrfs_root_item, level, 8);
2747 BTRFS_SETGET_STACK_FUNCS(root_dirid, struct btrfs_root_item, root_dirid, 64);
2748 BTRFS_SETGET_STACK_FUNCS(root_refs, struct btrfs_root_item, refs, 32);
2749 BTRFS_SETGET_STACK_FUNCS(root_flags, struct btrfs_root_item, flags, 64);
2750 BTRFS_SETGET_STACK_FUNCS(root_used, struct btrfs_root_item, bytes_used, 64);
2751 BTRFS_SETGET_STACK_FUNCS(root_limit, struct btrfs_root_item, byte_limit, 64);
2752 BTRFS_SETGET_STACK_FUNCS(root_last_snapshot, struct btrfs_root_item,
2754 BTRFS_SETGET_STACK_FUNCS(root_generation_v2, struct btrfs_root_item,
2756 BTRFS_SETGET_STACK_FUNCS(root_ctransid, struct btrfs_root_item,
2758 BTRFS_SETGET_STACK_FUNCS(root_otransid, struct btrfs_root_item,
2760 BTRFS_SETGET_STACK_FUNCS(root_stransid, struct btrfs_root_item,
2762 BTRFS_SETGET_STACK_FUNCS(root_rtransid, struct btrfs_root_item,
2765 static inline bool btrfs_root_readonly(struct btrfs_root *root)
2767 return (root->root_item.flags & cpu_to_le64(BTRFS_ROOT_SUBVOL_RDONLY)) != 0;
2770 /* struct btrfs_root_backup */
2771 BTRFS_SETGET_STACK_FUNCS(backup_tree_root, struct btrfs_root_backup,
2773 BTRFS_SETGET_STACK_FUNCS(backup_tree_root_gen, struct btrfs_root_backup,
2775 BTRFS_SETGET_STACK_FUNCS(backup_tree_root_level, struct btrfs_root_backup,
2776 tree_root_level, 8);
2778 BTRFS_SETGET_STACK_FUNCS(backup_chunk_root, struct btrfs_root_backup,
2780 BTRFS_SETGET_STACK_FUNCS(backup_chunk_root_gen, struct btrfs_root_backup,
2781 chunk_root_gen, 64);
2782 BTRFS_SETGET_STACK_FUNCS(backup_chunk_root_level, struct btrfs_root_backup,
2783 chunk_root_level, 8);
2785 BTRFS_SETGET_STACK_FUNCS(backup_extent_root, struct btrfs_root_backup,
2787 BTRFS_SETGET_STACK_FUNCS(backup_extent_root_gen, struct btrfs_root_backup,
2788 extent_root_gen, 64);
2789 BTRFS_SETGET_STACK_FUNCS(backup_extent_root_level, struct btrfs_root_backup,
2790 extent_root_level, 8);
2792 BTRFS_SETGET_STACK_FUNCS(backup_fs_root, struct btrfs_root_backup,
2794 BTRFS_SETGET_STACK_FUNCS(backup_fs_root_gen, struct btrfs_root_backup,
2796 BTRFS_SETGET_STACK_FUNCS(backup_fs_root_level, struct btrfs_root_backup,
2799 BTRFS_SETGET_STACK_FUNCS(backup_dev_root, struct btrfs_root_backup,
2801 BTRFS_SETGET_STACK_FUNCS(backup_dev_root_gen, struct btrfs_root_backup,
2803 BTRFS_SETGET_STACK_FUNCS(backup_dev_root_level, struct btrfs_root_backup,
2806 BTRFS_SETGET_STACK_FUNCS(backup_csum_root, struct btrfs_root_backup,
2808 BTRFS_SETGET_STACK_FUNCS(backup_csum_root_gen, struct btrfs_root_backup,
2810 BTRFS_SETGET_STACK_FUNCS(backup_csum_root_level, struct btrfs_root_backup,
2811 csum_root_level, 8);
2812 BTRFS_SETGET_STACK_FUNCS(backup_total_bytes, struct btrfs_root_backup,
2814 BTRFS_SETGET_STACK_FUNCS(backup_bytes_used, struct btrfs_root_backup,
2816 BTRFS_SETGET_STACK_FUNCS(backup_num_devices, struct btrfs_root_backup,
2819 /* struct btrfs_balance_item */
2820 BTRFS_SETGET_FUNCS(balance_flags, struct btrfs_balance_item, flags, 64);
2822 static inline void btrfs_balance_data(struct extent_buffer *eb,
2823 struct btrfs_balance_item *bi,
2824 struct btrfs_disk_balance_args *ba)
2826 read_eb_member(eb, bi, struct btrfs_balance_item, data, ba);
2829 static inline void btrfs_set_balance_data(struct extent_buffer *eb,
2830 struct btrfs_balance_item *bi,
2831 struct btrfs_disk_balance_args *ba)
2833 write_eb_member(eb, bi, struct btrfs_balance_item, data, ba);
2836 static inline void btrfs_balance_meta(struct extent_buffer *eb,
2837 struct btrfs_balance_item *bi,
2838 struct btrfs_disk_balance_args *ba)
2840 read_eb_member(eb, bi, struct btrfs_balance_item, meta, ba);
2843 static inline void btrfs_set_balance_meta(struct extent_buffer *eb,
2844 struct btrfs_balance_item *bi,
2845 struct btrfs_disk_balance_args *ba)
2847 write_eb_member(eb, bi, struct btrfs_balance_item, meta, ba);
2850 static inline void btrfs_balance_sys(struct extent_buffer *eb,
2851 struct btrfs_balance_item *bi,
2852 struct btrfs_disk_balance_args *ba)
2854 read_eb_member(eb, bi, struct btrfs_balance_item, sys, ba);
2857 static inline void btrfs_set_balance_sys(struct extent_buffer *eb,
2858 struct btrfs_balance_item *bi,
2859 struct btrfs_disk_balance_args *ba)
2861 write_eb_member(eb, bi, struct btrfs_balance_item, sys, ba);
2865 btrfs_disk_balance_args_to_cpu(struct btrfs_balance_args *cpu,
2866 struct btrfs_disk_balance_args *disk)
2868 memset(cpu, 0, sizeof(*cpu));
2870 cpu->profiles = le64_to_cpu(disk->profiles);
2871 cpu->usage = le64_to_cpu(disk->usage);
2872 cpu->devid = le64_to_cpu(disk->devid);
2873 cpu->pstart = le64_to_cpu(disk->pstart);
2874 cpu->pend = le64_to_cpu(disk->pend);
2875 cpu->vstart = le64_to_cpu(disk->vstart);
2876 cpu->vend = le64_to_cpu(disk->vend);
2877 cpu->target = le64_to_cpu(disk->target);
2878 cpu->flags = le64_to_cpu(disk->flags);
2882 btrfs_cpu_balance_args_to_disk(struct btrfs_disk_balance_args *disk,
2883 struct btrfs_balance_args *cpu)
2885 memset(disk, 0, sizeof(*disk));
2887 disk->profiles = cpu_to_le64(cpu->profiles);
2888 disk->usage = cpu_to_le64(cpu->usage);
2889 disk->devid = cpu_to_le64(cpu->devid);
2890 disk->pstart = cpu_to_le64(cpu->pstart);
2891 disk->pend = cpu_to_le64(cpu->pend);
2892 disk->vstart = cpu_to_le64(cpu->vstart);
2893 disk->vend = cpu_to_le64(cpu->vend);
2894 disk->target = cpu_to_le64(cpu->target);
2895 disk->flags = cpu_to_le64(cpu->flags);
2898 /* struct btrfs_super_block */
2899 BTRFS_SETGET_STACK_FUNCS(super_bytenr, struct btrfs_super_block, bytenr, 64);
2900 BTRFS_SETGET_STACK_FUNCS(super_flags, struct btrfs_super_block, flags, 64);
2901 BTRFS_SETGET_STACK_FUNCS(super_generation, struct btrfs_super_block,
2903 BTRFS_SETGET_STACK_FUNCS(super_root, struct btrfs_super_block, root, 64);
2904 BTRFS_SETGET_STACK_FUNCS(super_sys_array_size,
2905 struct btrfs_super_block, sys_chunk_array_size, 32);
2906 BTRFS_SETGET_STACK_FUNCS(super_chunk_root_generation,
2907 struct btrfs_super_block, chunk_root_generation, 64);
2908 BTRFS_SETGET_STACK_FUNCS(super_root_level, struct btrfs_super_block,
2910 BTRFS_SETGET_STACK_FUNCS(super_chunk_root, struct btrfs_super_block,
2912 BTRFS_SETGET_STACK_FUNCS(super_chunk_root_level, struct btrfs_super_block,
2913 chunk_root_level, 8);
2914 BTRFS_SETGET_STACK_FUNCS(super_log_root, struct btrfs_super_block,
2916 BTRFS_SETGET_STACK_FUNCS(super_log_root_transid, struct btrfs_super_block,
2917 log_root_transid, 64);
2918 BTRFS_SETGET_STACK_FUNCS(super_log_root_level, struct btrfs_super_block,
2920 BTRFS_SETGET_STACK_FUNCS(super_total_bytes, struct btrfs_super_block,
2922 BTRFS_SETGET_STACK_FUNCS(super_bytes_used, struct btrfs_super_block,
2924 BTRFS_SETGET_STACK_FUNCS(super_sectorsize, struct btrfs_super_block,
2926 BTRFS_SETGET_STACK_FUNCS(super_nodesize, struct btrfs_super_block,
2928 BTRFS_SETGET_STACK_FUNCS(super_leafsize, struct btrfs_super_block,
2930 BTRFS_SETGET_STACK_FUNCS(super_stripesize, struct btrfs_super_block,
2932 BTRFS_SETGET_STACK_FUNCS(super_root_dir, struct btrfs_super_block,
2933 root_dir_objectid, 64);
2934 BTRFS_SETGET_STACK_FUNCS(super_num_devices, struct btrfs_super_block,
2936 BTRFS_SETGET_STACK_FUNCS(super_compat_flags, struct btrfs_super_block,
2938 BTRFS_SETGET_STACK_FUNCS(super_compat_ro_flags, struct btrfs_super_block,
2939 compat_ro_flags, 64);
2940 BTRFS_SETGET_STACK_FUNCS(super_incompat_flags, struct btrfs_super_block,
2941 incompat_flags, 64);
2942 BTRFS_SETGET_STACK_FUNCS(super_csum_type, struct btrfs_super_block,
2944 BTRFS_SETGET_STACK_FUNCS(super_cache_generation, struct btrfs_super_block,
2945 cache_generation, 64);
2946 BTRFS_SETGET_STACK_FUNCS(super_magic, struct btrfs_super_block, magic, 64);
2947 BTRFS_SETGET_STACK_FUNCS(super_uuid_tree_generation, struct btrfs_super_block,
2948 uuid_tree_generation, 64);
2950 static inline int btrfs_super_csum_size(struct btrfs_super_block *s)
2952 u16 t = btrfs_super_csum_type(s);
2954 * csum type is validated at mount time
2956 return btrfs_csum_sizes[t];
2959 static inline unsigned long btrfs_leaf_data(struct extent_buffer *l)
2961 return offsetof(struct btrfs_leaf, items);
2964 /* struct btrfs_file_extent_item */
2965 BTRFS_SETGET_FUNCS(file_extent_type, struct btrfs_file_extent_item, type, 8);
2966 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_disk_bytenr,
2967 struct btrfs_file_extent_item, disk_bytenr, 64);
2968 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_offset,
2969 struct btrfs_file_extent_item, offset, 64);
2970 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_generation,
2971 struct btrfs_file_extent_item, generation, 64);
2972 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_num_bytes,
2973 struct btrfs_file_extent_item, num_bytes, 64);
2974 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_disk_num_bytes,
2975 struct btrfs_file_extent_item, disk_num_bytes, 64);
2976 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_compression,
2977 struct btrfs_file_extent_item, compression, 8);
2979 static inline unsigned long
2980 btrfs_file_extent_inline_start(struct btrfs_file_extent_item *e)
2982 unsigned long offset = (unsigned long)e;
2983 offset += offsetof(struct btrfs_file_extent_item, disk_bytenr);
2987 static inline u32 btrfs_file_extent_calc_inline_size(u32 datasize)
2989 return offsetof(struct btrfs_file_extent_item, disk_bytenr) + datasize;
2992 BTRFS_SETGET_FUNCS(file_extent_disk_bytenr, struct btrfs_file_extent_item,
2994 BTRFS_SETGET_FUNCS(file_extent_generation, struct btrfs_file_extent_item,
2996 BTRFS_SETGET_FUNCS(file_extent_disk_num_bytes, struct btrfs_file_extent_item,
2997 disk_num_bytes, 64);
2998 BTRFS_SETGET_FUNCS(file_extent_offset, struct btrfs_file_extent_item,
3000 BTRFS_SETGET_FUNCS(file_extent_num_bytes, struct btrfs_file_extent_item,
3002 BTRFS_SETGET_FUNCS(file_extent_ram_bytes, struct btrfs_file_extent_item,
3004 BTRFS_SETGET_FUNCS(file_extent_compression, struct btrfs_file_extent_item,
3006 BTRFS_SETGET_FUNCS(file_extent_encryption, struct btrfs_file_extent_item,
3008 BTRFS_SETGET_FUNCS(file_extent_other_encoding, struct btrfs_file_extent_item,
3009 other_encoding, 16);
3012 * this returns the number of bytes used by the item on disk, minus the
3013 * size of any extent headers. If a file is compressed on disk, this is
3014 * the compressed size
3016 static inline u32 btrfs_file_extent_inline_item_len(struct extent_buffer *eb,
3017 struct btrfs_item *e)
3019 unsigned long offset;
3020 offset = offsetof(struct btrfs_file_extent_item, disk_bytenr);
3021 return btrfs_item_size(eb, e) - offset;
3024 /* this returns the number of file bytes represented by the inline item.
3025 * If an item is compressed, this is the uncompressed size
3027 static inline u32 btrfs_file_extent_inline_len(struct extent_buffer *eb,
3029 struct btrfs_file_extent_item *fi)
3031 struct btrfs_map_token token;
3033 btrfs_init_map_token(&token);
3035 * return the space used on disk if this item isn't
3036 * compressed or encoded
3038 if (btrfs_token_file_extent_compression(eb, fi, &token) == 0 &&
3039 btrfs_token_file_extent_encryption(eb, fi, &token) == 0 &&
3040 btrfs_token_file_extent_other_encoding(eb, fi, &token) == 0) {
3041 return btrfs_file_extent_inline_item_len(eb,
3042 btrfs_item_nr(slot));
3045 /* otherwise use the ram bytes field */
3046 return btrfs_token_file_extent_ram_bytes(eb, fi, &token);
3050 /* btrfs_dev_stats_item */
3051 static inline u64 btrfs_dev_stats_value(struct extent_buffer *eb,
3052 struct btrfs_dev_stats_item *ptr,
3057 read_extent_buffer(eb, &val,
3058 offsetof(struct btrfs_dev_stats_item, values) +
3059 ((unsigned long)ptr) + (index * sizeof(u64)),
3064 static inline void btrfs_set_dev_stats_value(struct extent_buffer *eb,
3065 struct btrfs_dev_stats_item *ptr,
3068 write_extent_buffer(eb, &val,
3069 offsetof(struct btrfs_dev_stats_item, values) +
3070 ((unsigned long)ptr) + (index * sizeof(u64)),
3074 /* btrfs_qgroup_status_item */
3075 BTRFS_SETGET_FUNCS(qgroup_status_generation, struct btrfs_qgroup_status_item,
3077 BTRFS_SETGET_FUNCS(qgroup_status_version, struct btrfs_qgroup_status_item,
3079 BTRFS_SETGET_FUNCS(qgroup_status_flags, struct btrfs_qgroup_status_item,
3081 BTRFS_SETGET_FUNCS(qgroup_status_rescan, struct btrfs_qgroup_status_item,
3084 /* btrfs_qgroup_info_item */
3085 BTRFS_SETGET_FUNCS(qgroup_info_generation, struct btrfs_qgroup_info_item,
3087 BTRFS_SETGET_FUNCS(qgroup_info_rfer, struct btrfs_qgroup_info_item, rfer, 64);
3088 BTRFS_SETGET_FUNCS(qgroup_info_rfer_cmpr, struct btrfs_qgroup_info_item,
3090 BTRFS_SETGET_FUNCS(qgroup_info_excl, struct btrfs_qgroup_info_item, excl, 64);
3091 BTRFS_SETGET_FUNCS(qgroup_info_excl_cmpr, struct btrfs_qgroup_info_item,
3094 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_generation,
3095 struct btrfs_qgroup_info_item, generation, 64);
3096 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_rfer, struct btrfs_qgroup_info_item,
3098 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_rfer_cmpr,
3099 struct btrfs_qgroup_info_item, rfer_cmpr, 64);
3100 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_excl, struct btrfs_qgroup_info_item,
3102 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_excl_cmpr,
3103 struct btrfs_qgroup_info_item, excl_cmpr, 64);
3105 /* btrfs_qgroup_limit_item */
3106 BTRFS_SETGET_FUNCS(qgroup_limit_flags, struct btrfs_qgroup_limit_item,
3108 BTRFS_SETGET_FUNCS(qgroup_limit_max_rfer, struct btrfs_qgroup_limit_item,
3110 BTRFS_SETGET_FUNCS(qgroup_limit_max_excl, struct btrfs_qgroup_limit_item,
3112 BTRFS_SETGET_FUNCS(qgroup_limit_rsv_rfer, struct btrfs_qgroup_limit_item,
3114 BTRFS_SETGET_FUNCS(qgroup_limit_rsv_excl, struct btrfs_qgroup_limit_item,
3117 /* btrfs_dev_replace_item */
3118 BTRFS_SETGET_FUNCS(dev_replace_src_devid,
3119 struct btrfs_dev_replace_item, src_devid, 64);
3120 BTRFS_SETGET_FUNCS(dev_replace_cont_reading_from_srcdev_mode,
3121 struct btrfs_dev_replace_item, cont_reading_from_srcdev_mode,
3123 BTRFS_SETGET_FUNCS(dev_replace_replace_state, struct btrfs_dev_replace_item,
3125 BTRFS_SETGET_FUNCS(dev_replace_time_started, struct btrfs_dev_replace_item,
3127 BTRFS_SETGET_FUNCS(dev_replace_time_stopped, struct btrfs_dev_replace_item,
3129 BTRFS_SETGET_FUNCS(dev_replace_num_write_errors, struct btrfs_dev_replace_item,
3130 num_write_errors, 64);
3131 BTRFS_SETGET_FUNCS(dev_replace_num_uncorrectable_read_errors,
3132 struct btrfs_dev_replace_item, num_uncorrectable_read_errors,
3134 BTRFS_SETGET_FUNCS(dev_replace_cursor_left, struct btrfs_dev_replace_item,
3136 BTRFS_SETGET_FUNCS(dev_replace_cursor_right, struct btrfs_dev_replace_item,
3139 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_src_devid,
3140 struct btrfs_dev_replace_item, src_devid, 64);
3141 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_cont_reading_from_srcdev_mode,
3142 struct btrfs_dev_replace_item,
3143 cont_reading_from_srcdev_mode, 64);
3144 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_replace_state,
3145 struct btrfs_dev_replace_item, replace_state, 64);
3146 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_time_started,
3147 struct btrfs_dev_replace_item, time_started, 64);
3148 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_time_stopped,
3149 struct btrfs_dev_replace_item, time_stopped, 64);
3150 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_num_write_errors,
3151 struct btrfs_dev_replace_item, num_write_errors, 64);
3152 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_num_uncorrectable_read_errors,
3153 struct btrfs_dev_replace_item,
3154 num_uncorrectable_read_errors, 64);
3155 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_cursor_left,
3156 struct btrfs_dev_replace_item, cursor_left, 64);
3157 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_cursor_right,
3158 struct btrfs_dev_replace_item, cursor_right, 64);
3160 static inline struct btrfs_fs_info *btrfs_sb(struct super_block *sb)
3162 return sb->s_fs_info;
3165 static inline u32 btrfs_level_size(struct btrfs_root *root, int level)
3168 return root->leafsize;
3169 return root->nodesize;
3172 /* helper function to cast into the data area of the leaf. */
3173 #define btrfs_item_ptr(leaf, slot, type) \
3174 ((type *)(btrfs_leaf_data(leaf) + \
3175 btrfs_item_offset_nr(leaf, slot)))
3177 #define btrfs_item_ptr_offset(leaf, slot) \
3178 ((unsigned long)(btrfs_leaf_data(leaf) + \
3179 btrfs_item_offset_nr(leaf, slot)))
3181 static inline bool btrfs_mixed_space_info(struct btrfs_space_info *space_info)
3183 return ((space_info->flags & BTRFS_BLOCK_GROUP_METADATA) &&
3184 (space_info->flags & BTRFS_BLOCK_GROUP_DATA));
3187 static inline gfp_t btrfs_alloc_write_mask(struct address_space *mapping)
3189 return mapping_gfp_mask(mapping) & ~__GFP_FS;
3193 static inline u64 btrfs_calc_trans_metadata_size(struct btrfs_root *root,
3196 return (root->leafsize + root->nodesize * (BTRFS_MAX_LEVEL - 1)) *
3201 * Doing a truncate won't result in new nodes or leaves, just what we need for
3204 static inline u64 btrfs_calc_trunc_metadata_size(struct btrfs_root *root,
3207 return (root->leafsize + root->nodesize * (BTRFS_MAX_LEVEL - 1)) *
3211 int btrfs_should_throttle_delayed_refs(struct btrfs_trans_handle *trans,
3212 struct btrfs_root *root);
3213 int btrfs_check_space_for_delayed_refs(struct btrfs_trans_handle *trans,
3214 struct btrfs_root *root);
3215 void btrfs_put_block_group(struct btrfs_block_group_cache *cache);
3216 int btrfs_run_delayed_refs(struct btrfs_trans_handle *trans,
3217 struct btrfs_root *root, unsigned long count);
3218 int btrfs_lookup_extent(struct btrfs_root *root, u64 start, u64 len);
3219 int btrfs_lookup_extent_info(struct btrfs_trans_handle *trans,
3220 struct btrfs_root *root, u64 bytenr,
3221 u64 offset, int metadata, u64 *refs, u64 *flags);
3222 int btrfs_pin_extent(struct btrfs_root *root,
3223 u64 bytenr, u64 num, int reserved);
3224 int btrfs_pin_extent_for_log_replay(struct btrfs_root *root,
3225 u64 bytenr, u64 num_bytes);
3226 int btrfs_exclude_logged_extents(struct btrfs_root *root,
3227 struct extent_buffer *eb);
3228 int btrfs_cross_ref_exist(struct btrfs_trans_handle *trans,
3229 struct btrfs_root *root,
3230 u64 objectid, u64 offset, u64 bytenr);
3231 struct btrfs_block_group_cache *btrfs_lookup_block_group(
3232 struct btrfs_fs_info *info,
3234 void btrfs_put_block_group(struct btrfs_block_group_cache *cache);
3235 int get_block_group_index(struct btrfs_block_group_cache *cache);
3236 struct extent_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
3237 struct btrfs_root *root, u32 blocksize,
3238 u64 parent, u64 root_objectid,
3239 struct btrfs_disk_key *key, int level,
3240 u64 hint, u64 empty_size);
3241 void btrfs_free_tree_block(struct btrfs_trans_handle *trans,
3242 struct btrfs_root *root,
3243 struct extent_buffer *buf,
3244 u64 parent, int last_ref);
3245 int btrfs_alloc_reserved_file_extent(struct btrfs_trans_handle *trans,
3246 struct btrfs_root *root,
3247 u64 root_objectid, u64 owner,
3248 u64 offset, struct btrfs_key *ins);
3249 int btrfs_alloc_logged_file_extent(struct btrfs_trans_handle *trans,
3250 struct btrfs_root *root,
3251 u64 root_objectid, u64 owner, u64 offset,
3252 struct btrfs_key *ins);
3253 int btrfs_reserve_extent(struct btrfs_root *root, u64 num_bytes,
3254 u64 min_alloc_size, u64 empty_size, u64 hint_byte,
3255 struct btrfs_key *ins, int is_data);
3256 int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
3257 struct extent_buffer *buf, int full_backref, int for_cow);
3258 int btrfs_dec_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
3259 struct extent_buffer *buf, int full_backref, int for_cow);
3260 int btrfs_set_disk_extent_flags(struct btrfs_trans_handle *trans,
3261 struct btrfs_root *root,
3262 u64 bytenr, u64 num_bytes, u64 flags,
3263 int level, int is_data);
3264 int btrfs_free_extent(struct btrfs_trans_handle *trans,
3265 struct btrfs_root *root,
3266 u64 bytenr, u64 num_bytes, u64 parent, u64 root_objectid,
3267 u64 owner, u64 offset, int for_cow);
3269 int btrfs_free_reserved_extent(struct btrfs_root *root, u64 start, u64 len);
3270 int btrfs_free_and_pin_reserved_extent(struct btrfs_root *root,
3271 u64 start, u64 len);
3272 void btrfs_prepare_extent_commit(struct btrfs_trans_handle *trans,
3273 struct btrfs_root *root);
3274 int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans,
3275 struct btrfs_root *root);
3276 int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
3277 struct btrfs_root *root,
3278 u64 bytenr, u64 num_bytes, u64 parent,
3279 u64 root_objectid, u64 owner, u64 offset, int for_cow);
3281 int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans,
3282 struct btrfs_root *root);
3283 int btrfs_extent_readonly(struct btrfs_root *root, u64 bytenr);
3284 int btrfs_free_block_groups(struct btrfs_fs_info *info);
3285 int btrfs_read_block_groups(struct btrfs_root *root);
3286 int btrfs_can_relocate(struct btrfs_root *root, u64 bytenr);
3287 int btrfs_make_block_group(struct btrfs_trans_handle *trans,
3288 struct btrfs_root *root, u64 bytes_used,
3289 u64 type, u64 chunk_objectid, u64 chunk_offset,
3291 int btrfs_remove_block_group(struct btrfs_trans_handle *trans,
3292 struct btrfs_root *root, u64 group_start);
3293 void btrfs_create_pending_block_groups(struct btrfs_trans_handle *trans,
3294 struct btrfs_root *root);
3295 u64 btrfs_get_alloc_profile(struct btrfs_root *root, int data);
3296 void btrfs_clear_space_info_full(struct btrfs_fs_info *info);
3298 enum btrfs_reserve_flush_enum {
3299 /* If we are in the transaction, we can't flush anything.*/
3300 BTRFS_RESERVE_NO_FLUSH,
3302 * Flushing delalloc may cause deadlock somewhere, in this
3303 * case, use FLUSH LIMIT
3305 BTRFS_RESERVE_FLUSH_LIMIT,
3306 BTRFS_RESERVE_FLUSH_ALL,
3309 int btrfs_check_data_free_space(struct inode *inode, u64 bytes);
3310 void btrfs_free_reserved_data_space(struct inode *inode, u64 bytes);
3311 void btrfs_trans_release_metadata(struct btrfs_trans_handle *trans,
3312 struct btrfs_root *root);
3313 int btrfs_orphan_reserve_metadata(struct btrfs_trans_handle *trans,
3314 struct inode *inode);
3315 void btrfs_orphan_release_metadata(struct inode *inode);
3316 int btrfs_subvolume_reserve_metadata(struct btrfs_root *root,
3317 struct btrfs_block_rsv *rsv,
3319 u64 *qgroup_reserved, bool use_global_rsv);
3320 void btrfs_subvolume_release_metadata(struct btrfs_root *root,
3321 struct btrfs_block_rsv *rsv,
3322 u64 qgroup_reserved);
3323 int btrfs_delalloc_reserve_metadata(struct inode *inode, u64 num_bytes);
3324 void btrfs_delalloc_release_metadata(struct inode *inode, u64 num_bytes);
3325 int btrfs_delalloc_reserve_space(struct inode *inode, u64 num_bytes);
3326 void btrfs_delalloc_release_space(struct inode *inode, u64 num_bytes);
3327 void btrfs_init_block_rsv(struct btrfs_block_rsv *rsv, unsigned short type);
3328 struct btrfs_block_rsv *btrfs_alloc_block_rsv(struct btrfs_root *root,
3329 unsigned short type);
3330 void btrfs_free_block_rsv(struct btrfs_root *root,
3331 struct btrfs_block_rsv *rsv);
3332 int btrfs_block_rsv_add(struct btrfs_root *root,
3333 struct btrfs_block_rsv *block_rsv, u64 num_bytes,
3334 enum btrfs_reserve_flush_enum flush);
3335 int btrfs_block_rsv_check(struct btrfs_root *root,
3336 struct btrfs_block_rsv *block_rsv, int min_factor);
3337 int btrfs_block_rsv_refill(struct btrfs_root *root,
3338 struct btrfs_block_rsv *block_rsv, u64 min_reserved,
3339 enum btrfs_reserve_flush_enum flush);
3340 int btrfs_block_rsv_migrate(struct btrfs_block_rsv *src_rsv,
3341 struct btrfs_block_rsv *dst_rsv,
3343 int btrfs_cond_migrate_bytes(struct btrfs_fs_info *fs_info,
3344 struct btrfs_block_rsv *dest, u64 num_bytes,
3346 void btrfs_block_rsv_release(struct btrfs_root *root,
3347 struct btrfs_block_rsv *block_rsv,
3349 int btrfs_set_block_group_ro(struct btrfs_root *root,
3350 struct btrfs_block_group_cache *cache);
3351 void btrfs_set_block_group_rw(struct btrfs_root *root,
3352 struct btrfs_block_group_cache *cache);
3353 void btrfs_put_block_group_cache(struct btrfs_fs_info *info);
3354 u64 btrfs_account_ro_block_groups_free_space(struct btrfs_space_info *sinfo);
3355 int btrfs_error_unpin_extent_range(struct btrfs_root *root,
3356 u64 start, u64 end);
3357 int btrfs_error_discard_extent(struct btrfs_root *root, u64 bytenr,
3358 u64 num_bytes, u64 *actual_bytes);
3359 int btrfs_force_chunk_alloc(struct btrfs_trans_handle *trans,
3360 struct btrfs_root *root, u64 type);
3361 int btrfs_trim_fs(struct btrfs_root *root, struct fstrim_range *range);
3363 int btrfs_init_space_info(struct btrfs_fs_info *fs_info);
3364 int btrfs_delayed_refs_qgroup_accounting(struct btrfs_trans_handle *trans,
3365 struct btrfs_fs_info *fs_info);
3366 int __get_raid_index(u64 flags);
3368 int btrfs_start_nocow_write(struct btrfs_root *root);
3369 void btrfs_end_nocow_write(struct btrfs_root *root);
3371 int btrfs_bin_search(struct extent_buffer *eb, struct btrfs_key *key,
3372 int level, int *slot);
3373 int btrfs_comp_cpu_keys(struct btrfs_key *k1, struct btrfs_key *k2);
3374 int btrfs_previous_item(struct btrfs_root *root,
3375 struct btrfs_path *path, u64 min_objectid,
3377 int btrfs_previous_extent_item(struct btrfs_root *root,
3378 struct btrfs_path *path, u64 min_objectid);
3379 void btrfs_set_item_key_safe(struct btrfs_root *root, struct btrfs_path *path,
3380 struct btrfs_key *new_key);
3381 struct extent_buffer *btrfs_root_node(struct btrfs_root *root);
3382 struct extent_buffer *btrfs_lock_root_node(struct btrfs_root *root);
3383 int btrfs_find_next_key(struct btrfs_root *root, struct btrfs_path *path,
3384 struct btrfs_key *key, int lowest_level,
3386 int btrfs_search_forward(struct btrfs_root *root, struct btrfs_key *min_key,
3387 struct btrfs_path *path,
3389 enum btrfs_compare_tree_result {
3390 BTRFS_COMPARE_TREE_NEW,
3391 BTRFS_COMPARE_TREE_DELETED,
3392 BTRFS_COMPARE_TREE_CHANGED,
3393 BTRFS_COMPARE_TREE_SAME,
3395 typedef int (*btrfs_changed_cb_t)(struct btrfs_root *left_root,
3396 struct btrfs_root *right_root,
3397 struct btrfs_path *left_path,
3398 struct btrfs_path *right_path,
3399 struct btrfs_key *key,
3400 enum btrfs_compare_tree_result result,
3402 int btrfs_compare_trees(struct btrfs_root *left_root,
3403 struct btrfs_root *right_root,
3404 btrfs_changed_cb_t cb, void *ctx);
3405 int btrfs_cow_block(struct btrfs_trans_handle *trans,
3406 struct btrfs_root *root, struct extent_buffer *buf,
3407 struct extent_buffer *parent, int parent_slot,
3408 struct extent_buffer **cow_ret);
3409 int btrfs_copy_root(struct btrfs_trans_handle *trans,
3410 struct btrfs_root *root,
3411 struct extent_buffer *buf,
3412 struct extent_buffer **cow_ret, u64 new_root_objectid);
3413 int btrfs_block_can_be_shared(struct btrfs_root *root,
3414 struct extent_buffer *buf);
3415 void btrfs_extend_item(struct btrfs_root *root, struct btrfs_path *path,
3417 void btrfs_truncate_item(struct btrfs_root *root, struct btrfs_path *path,
3418 u32 new_size, int from_end);
3419 int btrfs_split_item(struct btrfs_trans_handle *trans,
3420 struct btrfs_root *root,
3421 struct btrfs_path *path,
3422 struct btrfs_key *new_key,
3423 unsigned long split_offset);
3424 int btrfs_duplicate_item(struct btrfs_trans_handle *trans,
3425 struct btrfs_root *root,
3426 struct btrfs_path *path,
3427 struct btrfs_key *new_key);
3428 int btrfs_find_item(struct btrfs_root *fs_root, struct btrfs_path *path,
3429 u64 inum, u64 ioff, u8 key_type, struct btrfs_key *found_key);
3430 int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root
3431 *root, struct btrfs_key *key, struct btrfs_path *p, int
3433 int btrfs_search_old_slot(struct btrfs_root *root, struct btrfs_key *key,
3434 struct btrfs_path *p, u64 time_seq);
3435 int btrfs_search_slot_for_read(struct btrfs_root *root,
3436 struct btrfs_key *key, struct btrfs_path *p,
3437 int find_higher, int return_any);
3438 int btrfs_realloc_node(struct btrfs_trans_handle *trans,
3439 struct btrfs_root *root, struct extent_buffer *parent,
3440 int start_slot, u64 *last_ret,
3441 struct btrfs_key *progress);
3442 void btrfs_release_path(struct btrfs_path *p);
3443 struct btrfs_path *btrfs_alloc_path(void);
3444 void btrfs_free_path(struct btrfs_path *p);
3445 void btrfs_set_path_blocking(struct btrfs_path *p);
3446 void btrfs_clear_path_blocking(struct btrfs_path *p,
3447 struct extent_buffer *held, int held_rw);
3448 void btrfs_unlock_up_safe(struct btrfs_path *p, int level);
3450 int btrfs_del_items(struct btrfs_trans_handle *trans, struct btrfs_root *root,
3451 struct btrfs_path *path, int slot, int nr);
3452 static inline int btrfs_del_item(struct btrfs_trans_handle *trans,
3453 struct btrfs_root *root,
3454 struct btrfs_path *path)
3456 return btrfs_del_items(trans, root, path, path->slots[0], 1);
3459 void setup_items_for_insert(struct btrfs_root *root, struct btrfs_path *path,
3460 struct btrfs_key *cpu_key, u32 *data_size,
3461 u32 total_data, u32 total_size, int nr);
3462 int btrfs_insert_item(struct btrfs_trans_handle *trans, struct btrfs_root
3463 *root, struct btrfs_key *key, void *data, u32 data_size);
3464 int btrfs_insert_empty_items(struct btrfs_trans_handle *trans,
3465 struct btrfs_root *root,
3466 struct btrfs_path *path,
3467 struct btrfs_key *cpu_key, u32 *data_size, int nr);
3469 static inline int btrfs_insert_empty_item(struct btrfs_trans_handle *trans,
3470 struct btrfs_root *root,
3471 struct btrfs_path *path,
3472 struct btrfs_key *key,
3475 return btrfs_insert_empty_items(trans, root, path, key, &data_size, 1);
3478 int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path);
3479 int btrfs_prev_leaf(struct btrfs_root *root, struct btrfs_path *path);
3480 int btrfs_next_old_leaf(struct btrfs_root *root, struct btrfs_path *path,
3482 static inline int btrfs_next_old_item(struct btrfs_root *root,
3483 struct btrfs_path *p, u64 time_seq)
3486 if (p->slots[0] >= btrfs_header_nritems(p->nodes[0]))
3487 return btrfs_next_old_leaf(root, p, time_seq);
3490 static inline int btrfs_next_item(struct btrfs_root *root, struct btrfs_path *p)
3492 return btrfs_next_old_item(root, p, 0);
3494 int btrfs_leaf_free_space(struct btrfs_root *root, struct extent_buffer *leaf);
3495 int __must_check btrfs_drop_snapshot(struct btrfs_root *root,
3496 struct btrfs_block_rsv *block_rsv,
3497 int update_ref, int for_reloc);
3498 int btrfs_drop_subtree(struct btrfs_trans_handle *trans,
3499 struct btrfs_root *root,
3500 struct extent_buffer *node,
3501 struct extent_buffer *parent);
3502 static inline int btrfs_fs_closing(struct btrfs_fs_info *fs_info)
3505 * Get synced with close_ctree()
3508 return fs_info->closing;
3512 * If we remount the fs to be R/O or umount the fs, the cleaner needn't do
3513 * anything except sleeping. This function is used to check the status of
3516 static inline int btrfs_need_cleaner_sleep(struct btrfs_root *root)
3518 return (root->fs_info->sb->s_flags & MS_RDONLY ||
3519 btrfs_fs_closing(root->fs_info));
3522 static inline void free_fs_info(struct btrfs_fs_info *fs_info)
3524 kfree(fs_info->balance_ctl);
3525 kfree(fs_info->delayed_root);
3526 kfree(fs_info->extent_root);
3527 kfree(fs_info->tree_root);
3528 kfree(fs_info->chunk_root);
3529 kfree(fs_info->dev_root);
3530 kfree(fs_info->csum_root);
3531 kfree(fs_info->quota_root);
3532 kfree(fs_info->uuid_root);
3533 kfree(fs_info->super_copy);
3534 kfree(fs_info->super_for_commit);
3538 /* tree mod log functions from ctree.c */
3539 u64 btrfs_get_tree_mod_seq(struct btrfs_fs_info *fs_info,
3540 struct seq_list *elem);
3541 void btrfs_put_tree_mod_seq(struct btrfs_fs_info *fs_info,
3542 struct seq_list *elem);
3543 u64 btrfs_tree_mod_seq_prev(u64 seq);
3544 int btrfs_old_root_level(struct btrfs_root *root, u64 time_seq);
3547 int btrfs_find_root_ref(struct btrfs_root *tree_root,
3548 struct btrfs_path *path,
3549 u64 root_id, u64 ref_id);
3550 int btrfs_add_root_ref(struct btrfs_trans_handle *trans,
3551 struct btrfs_root *tree_root,
3552 u64 root_id, u64 ref_id, u64 dirid, u64 sequence,
3553 const char *name, int name_len);
3554 int btrfs_del_root_ref(struct btrfs_trans_handle *trans,
3555 struct btrfs_root *tree_root,
3556 u64 root_id, u64 ref_id, u64 dirid, u64 *sequence,
3557 const char *name, int name_len);
3558 int btrfs_del_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
3559 struct btrfs_key *key);
3560 int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root
3561 *root, struct btrfs_key *key, struct btrfs_root_item
3563 int __must_check btrfs_update_root(struct btrfs_trans_handle *trans,
3564 struct btrfs_root *root,
3565 struct btrfs_key *key,
3566 struct btrfs_root_item *item);
3567 int btrfs_find_root(struct btrfs_root *root, struct btrfs_key *search_key,
3568 struct btrfs_path *path, struct btrfs_root_item *root_item,
3569 struct btrfs_key *root_key);
3570 int btrfs_find_orphan_roots(struct btrfs_root *tree_root);
3571 void btrfs_set_root_node(struct btrfs_root_item *item,
3572 struct extent_buffer *node);
3573 void btrfs_check_and_init_root_item(struct btrfs_root_item *item);
3574 void btrfs_update_root_times(struct btrfs_trans_handle *trans,
3575 struct btrfs_root *root);
3578 int btrfs_uuid_tree_add(struct btrfs_trans_handle *trans,
3579 struct btrfs_root *uuid_root, u8 *uuid, u8 type,
3581 int btrfs_uuid_tree_rem(struct btrfs_trans_handle *trans,
3582 struct btrfs_root *uuid_root, u8 *uuid, u8 type,
3584 int btrfs_uuid_tree_iterate(struct btrfs_fs_info *fs_info,
3585 int (*check_func)(struct btrfs_fs_info *, u8 *, u8,
3589 int btrfs_check_dir_item_collision(struct btrfs_root *root, u64 dir,
3590 const char *name, int name_len);
3591 int btrfs_insert_dir_item(struct btrfs_trans_handle *trans,
3592 struct btrfs_root *root, const char *name,
3593 int name_len, struct inode *dir,
3594 struct btrfs_key *location, u8 type, u64 index);
3595 struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans,
3596 struct btrfs_root *root,
3597 struct btrfs_path *path, u64 dir,
3598 const char *name, int name_len,
3600 struct btrfs_dir_item *
3601 btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans,
3602 struct btrfs_root *root,
3603 struct btrfs_path *path, u64 dir,
3604 u64 objectid, const char *name, int name_len,
3606 struct btrfs_dir_item *
3607 btrfs_search_dir_index_item(struct btrfs_root *root,
3608 struct btrfs_path *path, u64 dirid,
3609 const char *name, int name_len);
3610 int btrfs_delete_one_dir_name(struct btrfs_trans_handle *trans,
3611 struct btrfs_root *root,
3612 struct btrfs_path *path,
3613 struct btrfs_dir_item *di);
3614 int btrfs_insert_xattr_item(struct btrfs_trans_handle *trans,
3615 struct btrfs_root *root,
3616 struct btrfs_path *path, u64 objectid,
3617 const char *name, u16 name_len,
3618 const void *data, u16 data_len);
3619 struct btrfs_dir_item *btrfs_lookup_xattr(struct btrfs_trans_handle *trans,
3620 struct btrfs_root *root,
3621 struct btrfs_path *path, u64 dir,
3622 const char *name, u16 name_len,
3624 int verify_dir_item(struct btrfs_root *root,
3625 struct extent_buffer *leaf,
3626 struct btrfs_dir_item *dir_item);
3629 int btrfs_insert_orphan_item(struct btrfs_trans_handle *trans,
3630 struct btrfs_root *root, u64 offset);
3631 int btrfs_del_orphan_item(struct btrfs_trans_handle *trans,
3632 struct btrfs_root *root, u64 offset);
3633 int btrfs_find_orphan_item(struct btrfs_root *root, u64 offset);
3636 int btrfs_insert_inode_ref(struct btrfs_trans_handle *trans,
3637 struct btrfs_root *root,
3638 const char *name, int name_len,
3639 u64 inode_objectid, u64 ref_objectid, u64 index);
3640 int btrfs_del_inode_ref(struct btrfs_trans_handle *trans,
3641 struct btrfs_root *root,
3642 const char *name, int name_len,
3643 u64 inode_objectid, u64 ref_objectid, u64 *index);
3644 int btrfs_insert_empty_inode(struct btrfs_trans_handle *trans,
3645 struct btrfs_root *root,
3646 struct btrfs_path *path, u64 objectid);
3647 int btrfs_lookup_inode(struct btrfs_trans_handle *trans, struct btrfs_root
3648 *root, struct btrfs_path *path,
3649 struct btrfs_key *location, int mod);
3651 struct btrfs_inode_extref *
3652 btrfs_lookup_inode_extref(struct btrfs_trans_handle *trans,
3653 struct btrfs_root *root,
3654 struct btrfs_path *path,
3655 const char *name, int name_len,
3656 u64 inode_objectid, u64 ref_objectid, int ins_len,
3659 int btrfs_find_name_in_ext_backref(struct btrfs_path *path,
3660 u64 ref_objectid, const char *name,
3662 struct btrfs_inode_extref **extref_ret);
3665 struct btrfs_dio_private;
3666 int btrfs_del_csums(struct btrfs_trans_handle *trans,
3667 struct btrfs_root *root, u64 bytenr, u64 len);
3668 int btrfs_lookup_bio_sums(struct btrfs_root *root, struct inode *inode,
3669 struct bio *bio, u32 *dst);
3670 int btrfs_lookup_bio_sums_dio(struct btrfs_root *root, struct inode *inode,
3671 struct btrfs_dio_private *dip, struct bio *bio,
3672 u64 logical_offset);
3673 int btrfs_insert_file_extent(struct btrfs_trans_handle *trans,
3674 struct btrfs_root *root,
3675 u64 objectid, u64 pos,
3676 u64 disk_offset, u64 disk_num_bytes,
3677 u64 num_bytes, u64 offset, u64 ram_bytes,
3678 u8 compression, u8 encryption, u16 other_encoding);
3679 int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
3680 struct btrfs_root *root,
3681 struct btrfs_path *path, u64 objectid,
3682 u64 bytenr, int mod);
3683 int btrfs_csum_file_blocks(struct btrfs_trans_handle *trans,
3684 struct btrfs_root *root,
3685 struct btrfs_ordered_sum *sums);
3686 int btrfs_csum_one_bio(struct btrfs_root *root, struct inode *inode,
3687 struct bio *bio, u64 file_start, int contig);
3688 int btrfs_lookup_csums_range(struct btrfs_root *root, u64 start, u64 end,
3689 struct list_head *list, int search_commit);
3691 struct btrfs_delalloc_work {
3692 struct inode *inode;
3695 struct completion completion;
3696 struct list_head list;
3697 struct btrfs_work work;
3700 struct btrfs_delalloc_work *btrfs_alloc_delalloc_work(struct inode *inode,
3701 int wait, int delay_iput);
3702 void btrfs_wait_and_free_delalloc_work(struct btrfs_delalloc_work *work);
3704 struct extent_map *btrfs_get_extent_fiemap(struct inode *inode, struct page *page,
3705 size_t pg_offset, u64 start, u64 len,
3707 noinline int can_nocow_extent(struct inode *inode, u64 offset, u64 *len,
3708 u64 *orig_start, u64 *orig_block_len,
3711 /* RHEL and EL kernels have a patch that renames PG_checked to FsMisc */
3712 #if defined(ClearPageFsMisc) && !defined(ClearPageChecked)
3713 #define ClearPageChecked ClearPageFsMisc
3714 #define SetPageChecked SetPageFsMisc
3715 #define PageChecked PageFsMisc
3718 /* This forces readahead on a given range of bytes in an inode */
3719 static inline void btrfs_force_ra(struct address_space *mapping,
3720 struct file_ra_state *ra, struct file *file,
3721 pgoff_t offset, unsigned long req_size)
3723 page_cache_sync_readahead(mapping, ra, file, offset, req_size);
3726 struct inode *btrfs_lookup_dentry(struct inode *dir, struct dentry *dentry);
3727 int btrfs_set_inode_index(struct inode *dir, u64 *index);
3728 int btrfs_unlink_inode(struct btrfs_trans_handle *trans,
3729 struct btrfs_root *root,
3730 struct inode *dir, struct inode *inode,
3731 const char *name, int name_len);
3732 int btrfs_add_link(struct btrfs_trans_handle *trans,
3733 struct inode *parent_inode, struct inode *inode,
3734 const char *name, int name_len, int add_backref, u64 index);
3735 int btrfs_unlink_subvol(struct btrfs_trans_handle *trans,
3736 struct btrfs_root *root,
3737 struct inode *dir, u64 objectid,
3738 const char *name, int name_len);
3739 int btrfs_truncate_page(struct inode *inode, loff_t from, loff_t len,
3741 int btrfs_truncate_inode_items(struct btrfs_trans_handle *trans,
3742 struct btrfs_root *root,
3743 struct inode *inode, u64 new_size,
3746 int btrfs_start_delalloc_inodes(struct btrfs_root *root, int delay_iput);
3747 int btrfs_start_delalloc_roots(struct btrfs_fs_info *fs_info, int delay_iput,
3749 int btrfs_set_extent_delalloc(struct inode *inode, u64 start, u64 end,
3750 struct extent_state **cached_state);
3751 int btrfs_create_subvol_root(struct btrfs_trans_handle *trans,
3752 struct btrfs_root *new_root,
3753 struct btrfs_root *parent_root,
3755 int btrfs_merge_bio_hook(int rw, struct page *page, unsigned long offset,
3756 size_t size, struct bio *bio,
3757 unsigned long bio_flags);
3758 int btrfs_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf);
3759 int btrfs_readpage(struct file *file, struct page *page);
3760 void btrfs_evict_inode(struct inode *inode);
3761 int btrfs_write_inode(struct inode *inode, struct writeback_control *wbc);
3762 struct inode *btrfs_alloc_inode(struct super_block *sb);
3763 void btrfs_destroy_inode(struct inode *inode);
3764 int btrfs_drop_inode(struct inode *inode);
3765 int btrfs_init_cachep(void);
3766 void btrfs_destroy_cachep(void);
3767 long btrfs_ioctl_trans_end(struct file *file);
3768 struct inode *btrfs_iget(struct super_block *s, struct btrfs_key *location,
3769 struct btrfs_root *root, int *was_new);
3770 struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page,
3771 size_t pg_offset, u64 start, u64 end,
3773 int btrfs_update_inode(struct btrfs_trans_handle *trans,
3774 struct btrfs_root *root,
3775 struct inode *inode);
3776 int btrfs_update_inode_fallback(struct btrfs_trans_handle *trans,
3777 struct btrfs_root *root, struct inode *inode);
3778 int btrfs_orphan_add(struct btrfs_trans_handle *trans, struct inode *inode);
3779 int btrfs_orphan_cleanup(struct btrfs_root *root);
3780 void btrfs_orphan_commit_root(struct btrfs_trans_handle *trans,
3781 struct btrfs_root *root);
3782 int btrfs_cont_expand(struct inode *inode, loff_t oldsize, loff_t size);
3783 void btrfs_invalidate_inodes(struct btrfs_root *root);
3784 void btrfs_add_delayed_iput(struct inode *inode);
3785 void btrfs_run_delayed_iputs(struct btrfs_root *root);
3786 int btrfs_prealloc_file_range(struct inode *inode, int mode,
3787 u64 start, u64 num_bytes, u64 min_size,
3788 loff_t actual_len, u64 *alloc_hint);
3789 int btrfs_prealloc_file_range_trans(struct inode *inode,
3790 struct btrfs_trans_handle *trans, int mode,
3791 u64 start, u64 num_bytes, u64 min_size,
3792 loff_t actual_len, u64 *alloc_hint);
3793 extern const struct dentry_operations btrfs_dentry_operations;
3796 long btrfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
3797 void btrfs_update_iflags(struct inode *inode);
3798 void btrfs_inherit_iflags(struct inode *inode, struct inode *dir);
3799 int btrfs_is_empty_uuid(u8 *uuid);
3800 int btrfs_defrag_file(struct inode *inode, struct file *file,
3801 struct btrfs_ioctl_defrag_range_args *range,
3802 u64 newer_than, unsigned long max_pages);
3803 void btrfs_get_block_group_info(struct list_head *groups_list,
3804 struct btrfs_ioctl_space_info *space);
3805 void update_ioctl_balance_args(struct btrfs_fs_info *fs_info, int lock,
3806 struct btrfs_ioctl_balance_args *bargs);
3810 int btrfs_auto_defrag_init(void);
3811 void btrfs_auto_defrag_exit(void);
3812 int btrfs_add_inode_defrag(struct btrfs_trans_handle *trans,
3813 struct inode *inode);
3814 int btrfs_run_defrag_inodes(struct btrfs_fs_info *fs_info);
3815 void btrfs_cleanup_defrag_inodes(struct btrfs_fs_info *fs_info);
3816 int btrfs_sync_file(struct file *file, loff_t start, loff_t end, int datasync);
3817 void btrfs_drop_extent_cache(struct inode *inode, u64 start, u64 end,
3819 extern const struct file_operations btrfs_file_operations;
3820 int __btrfs_drop_extents(struct btrfs_trans_handle *trans,
3821 struct btrfs_root *root, struct inode *inode,
3822 struct btrfs_path *path, u64 start, u64 end,
3823 u64 *drop_end, int drop_cache,
3825 u32 extent_item_size,
3827 int btrfs_drop_extents(struct btrfs_trans_handle *trans,
3828 struct btrfs_root *root, struct inode *inode, u64 start,
3829 u64 end, int drop_cache);
3830 int btrfs_mark_extent_written(struct btrfs_trans_handle *trans,
3831 struct inode *inode, u64 start, u64 end);
3832 int btrfs_release_file(struct inode *inode, struct file *file);
3833 int btrfs_dirty_pages(struct btrfs_root *root, struct inode *inode,
3834 struct page **pages, size_t num_pages,
3835 loff_t pos, size_t write_bytes,
3836 struct extent_state **cached);
3839 int btrfs_defrag_leaves(struct btrfs_trans_handle *trans,
3840 struct btrfs_root *root);
3843 int btrfs_init_sysfs(void);
3844 void btrfs_exit_sysfs(void);
3845 int btrfs_sysfs_add_one(struct btrfs_fs_info *fs_info);
3846 void btrfs_sysfs_remove_one(struct btrfs_fs_info *fs_info);
3849 ssize_t btrfs_listxattr(struct dentry *dentry, char *buffer, size_t size);
3852 int btrfs_parse_options(struct btrfs_root *root, char *options);
3853 int btrfs_sync_fs(struct super_block *sb, int wait);
3855 #ifdef CONFIG_PRINTK
3857 void btrfs_printk(const struct btrfs_fs_info *fs_info, const char *fmt, ...);
3859 static inline __printf(2, 3)
3860 void btrfs_printk(const struct btrfs_fs_info *fs_info, const char *fmt, ...)
3865 #define btrfs_emerg(fs_info, fmt, args...) \
3866 btrfs_printk(fs_info, KERN_EMERG fmt, ##args)
3867 #define btrfs_alert(fs_info, fmt, args...) \
3868 btrfs_printk(fs_info, KERN_ALERT fmt, ##args)
3869 #define btrfs_crit(fs_info, fmt, args...) \
3870 btrfs_printk(fs_info, KERN_CRIT fmt, ##args)
3871 #define btrfs_err(fs_info, fmt, args...) \
3872 btrfs_printk(fs_info, KERN_ERR fmt, ##args)
3873 #define btrfs_warn(fs_info, fmt, args...) \
3874 btrfs_printk(fs_info, KERN_WARNING fmt, ##args)
3875 #define btrfs_notice(fs_info, fmt, args...) \
3876 btrfs_printk(fs_info, KERN_NOTICE fmt, ##args)
3877 #define btrfs_info(fs_info, fmt, args...) \
3878 btrfs_printk(fs_info, KERN_INFO fmt, ##args)
3881 #define btrfs_debug(fs_info, fmt, args...) \
3882 btrfs_printk(fs_info, KERN_DEBUG fmt, ##args)
3884 #define btrfs_debug(fs_info, fmt, args...) \
3885 no_printk(KERN_DEBUG fmt, ##args)
3888 #ifdef CONFIG_BTRFS_ASSERT
3890 static inline void assfail(char *expr, char *file, int line)
3892 pr_err("BTRFS: assertion failed: %s, file: %s, line: %d",
3897 #define ASSERT(expr) \
3898 (likely(expr) ? (void)0 : assfail(#expr, __FILE__, __LINE__))
3900 #define ASSERT(expr) ((void)0)
3903 #define btrfs_assert()
3905 void __btrfs_std_error(struct btrfs_fs_info *fs_info, const char *function,
3906 unsigned int line, int errno, const char *fmt, ...);
3909 void __btrfs_abort_transaction(struct btrfs_trans_handle *trans,
3910 struct btrfs_root *root, const char *function,
3911 unsigned int line, int errno);
3913 #define btrfs_set_fs_incompat(__fs_info, opt) \
3914 __btrfs_set_fs_incompat((__fs_info), BTRFS_FEATURE_INCOMPAT_##opt)
3916 static inline void __btrfs_set_fs_incompat(struct btrfs_fs_info *fs_info,
3919 struct btrfs_super_block *disk_super;
3922 disk_super = fs_info->super_copy;
3923 features = btrfs_super_incompat_flags(disk_super);
3924 if (!(features & flag)) {
3925 spin_lock(&fs_info->super_lock);
3926 features = btrfs_super_incompat_flags(disk_super);
3927 if (!(features & flag)) {
3929 btrfs_set_super_incompat_flags(disk_super, features);
3930 btrfs_info(fs_info, "setting %llu feature flag",
3933 spin_unlock(&fs_info->super_lock);
3937 #define btrfs_fs_incompat(fs_info, opt) \
3938 __btrfs_fs_incompat((fs_info), BTRFS_FEATURE_INCOMPAT_##opt)
3940 static inline int __btrfs_fs_incompat(struct btrfs_fs_info *fs_info, u64 flag)
3942 struct btrfs_super_block *disk_super;
3943 disk_super = fs_info->super_copy;
3944 return !!(btrfs_super_incompat_flags(disk_super) & flag);
3948 * Call btrfs_abort_transaction as early as possible when an error condition is
3949 * detected, that way the exact line number is reported.
3952 #define btrfs_abort_transaction(trans, root, errno) \
3954 __btrfs_abort_transaction(trans, root, __func__, \
3958 #define btrfs_std_error(fs_info, errno) \
3961 __btrfs_std_error((fs_info), __func__, \
3962 __LINE__, (errno), NULL); \
3965 #define btrfs_error(fs_info, errno, fmt, args...) \
3967 __btrfs_std_error((fs_info), __func__, __LINE__, \
3968 (errno), fmt, ##args); \
3972 void __btrfs_panic(struct btrfs_fs_info *fs_info, const char *function,
3973 unsigned int line, int errno, const char *fmt, ...);
3976 * If BTRFS_MOUNT_PANIC_ON_FATAL_ERROR is in mount_opt, __btrfs_panic
3977 * will panic(). Otherwise we BUG() here.
3979 #define btrfs_panic(fs_info, errno, fmt, args...) \
3981 __btrfs_panic(fs_info, __func__, __LINE__, errno, fmt, ##args); \
3986 #ifdef CONFIG_BTRFS_FS_POSIX_ACL
3987 struct posix_acl *btrfs_get_acl(struct inode *inode, int type);
3988 int btrfs_set_acl(struct inode *inode, struct posix_acl *acl, int type);
3989 int btrfs_init_acl(struct btrfs_trans_handle *trans,
3990 struct inode *inode, struct inode *dir);
3992 #define btrfs_get_acl NULL
3993 #define btrfs_set_acl NULL
3994 static inline int btrfs_init_acl(struct btrfs_trans_handle *trans,
3995 struct inode *inode, struct inode *dir)
4002 int btrfs_relocate_block_group(struct btrfs_root *root, u64 group_start);
4003 int btrfs_init_reloc_root(struct btrfs_trans_handle *trans,
4004 struct btrfs_root *root);
4005 int btrfs_update_reloc_root(struct btrfs_trans_handle *trans,
4006 struct btrfs_root *root);
4007 int btrfs_recover_relocation(struct btrfs_root *root);
4008 int btrfs_reloc_clone_csums(struct inode *inode, u64 file_pos, u64 len);
4009 int btrfs_reloc_cow_block(struct btrfs_trans_handle *trans,
4010 struct btrfs_root *root, struct extent_buffer *buf,
4011 struct extent_buffer *cow);
4012 void btrfs_reloc_pre_snapshot(struct btrfs_trans_handle *trans,
4013 struct btrfs_pending_snapshot *pending,
4014 u64 *bytes_to_reserve);
4015 int btrfs_reloc_post_snapshot(struct btrfs_trans_handle *trans,
4016 struct btrfs_pending_snapshot *pending);
4019 int btrfs_scrub_dev(struct btrfs_fs_info *fs_info, u64 devid, u64 start,
4020 u64 end, struct btrfs_scrub_progress *progress,
4021 int readonly, int is_dev_replace);
4022 void btrfs_scrub_pause(struct btrfs_root *root);
4023 void btrfs_scrub_continue(struct btrfs_root *root);
4024 int btrfs_scrub_cancel(struct btrfs_fs_info *info);
4025 int btrfs_scrub_cancel_dev(struct btrfs_fs_info *info,
4026 struct btrfs_device *dev);
4027 int btrfs_scrub_progress(struct btrfs_root *root, u64 devid,
4028 struct btrfs_scrub_progress *progress);
4031 void btrfs_bio_counter_inc_blocked(struct btrfs_fs_info *fs_info);
4032 void btrfs_bio_counter_inc_noblocked(struct btrfs_fs_info *fs_info);
4033 void btrfs_bio_counter_dec(struct btrfs_fs_info *fs_info);
4036 struct reada_control {
4037 struct btrfs_root *root; /* tree to prefetch */
4038 struct btrfs_key key_start;
4039 struct btrfs_key key_end; /* exclusive */
4042 wait_queue_head_t wait;
4044 struct reada_control *btrfs_reada_add(struct btrfs_root *root,
4045 struct btrfs_key *start, struct btrfs_key *end);
4046 int btrfs_reada_wait(void *handle);
4047 void btrfs_reada_detach(void *handle);
4048 int btree_readahead_hook(struct btrfs_root *root, struct extent_buffer *eb,
4049 u64 start, int err);
4052 struct qgroup_update {
4053 struct list_head list;
4054 struct btrfs_delayed_ref_node *node;
4055 struct btrfs_delayed_extent_op *extent_op;
4058 int btrfs_quota_enable(struct btrfs_trans_handle *trans,
4059 struct btrfs_fs_info *fs_info);
4060 int btrfs_quota_disable(struct btrfs_trans_handle *trans,
4061 struct btrfs_fs_info *fs_info);
4062 int btrfs_qgroup_rescan(struct btrfs_fs_info *fs_info);
4063 void btrfs_qgroup_rescan_resume(struct btrfs_fs_info *fs_info);
4064 int btrfs_qgroup_wait_for_completion(struct btrfs_fs_info *fs_info);
4065 int btrfs_add_qgroup_relation(struct btrfs_trans_handle *trans,
4066 struct btrfs_fs_info *fs_info, u64 src, u64 dst);
4067 int btrfs_del_qgroup_relation(struct btrfs_trans_handle *trans,
4068 struct btrfs_fs_info *fs_info, u64 src, u64 dst);
4069 int btrfs_create_qgroup(struct btrfs_trans_handle *trans,
4070 struct btrfs_fs_info *fs_info, u64 qgroupid,
4072 int btrfs_remove_qgroup(struct btrfs_trans_handle *trans,
4073 struct btrfs_fs_info *fs_info, u64 qgroupid);
4074 int btrfs_limit_qgroup(struct btrfs_trans_handle *trans,
4075 struct btrfs_fs_info *fs_info, u64 qgroupid,
4076 struct btrfs_qgroup_limit *limit);
4077 int btrfs_read_qgroup_config(struct btrfs_fs_info *fs_info);
4078 void btrfs_free_qgroup_config(struct btrfs_fs_info *fs_info);
4079 struct btrfs_delayed_extent_op;
4080 int btrfs_qgroup_record_ref(struct btrfs_trans_handle *trans,
4081 struct btrfs_delayed_ref_node *node,
4082 struct btrfs_delayed_extent_op *extent_op);
4083 int btrfs_qgroup_account_ref(struct btrfs_trans_handle *trans,
4084 struct btrfs_fs_info *fs_info,
4085 struct btrfs_delayed_ref_node *node,
4086 struct btrfs_delayed_extent_op *extent_op);
4087 int btrfs_run_qgroups(struct btrfs_trans_handle *trans,
4088 struct btrfs_fs_info *fs_info);
4089 int btrfs_qgroup_inherit(struct btrfs_trans_handle *trans,
4090 struct btrfs_fs_info *fs_info, u64 srcid, u64 objectid,
4091 struct btrfs_qgroup_inherit *inherit);
4092 int btrfs_qgroup_reserve(struct btrfs_root *root, u64 num_bytes);
4093 void btrfs_qgroup_free(struct btrfs_root *root, u64 num_bytes);
4095 void assert_qgroups_uptodate(struct btrfs_trans_handle *trans);
4097 static inline int is_fstree(u64 rootid)
4099 if (rootid == BTRFS_FS_TREE_OBJECTID ||
4100 (s64)rootid >= (s64)BTRFS_FIRST_FREE_OBJECTID)
4105 static inline int btrfs_defrag_cancelled(struct btrfs_fs_info *fs_info)
4107 return signal_pending(current);
4110 /* Sanity test specific functions */
4111 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
4112 void btrfs_test_destroy_inode(struct inode *inode);