fs/btrfs/ctree.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * Copyright (C) 2007 Oracle.  All rights reserved.
   4  */
   5
   6 #ifndef BTRFS_CTREE_H
   7 #define BTRFS_CTREE_H
   8
   9 #include <linux/mm.h>
  10 #include <linux/sched/signal.h>
  11 #include <linux/highmem.h>
  12 #include <linux/fs.h>
  13 #include <linux/rwsem.h>
  14 #include <linux/semaphore.h>
  15 #include <linux/completion.h>
  16 #include <linux/backing-dev.h>
  17 #include <linux/wait.h>
  18 #include <linux/slab.h>
  19 #include <linux/kobject.h>
  20 #include <trace/events/btrfs.h>
  21 #include <asm/kmap_types.h>
  22 #include <linux/pagemap.h>
  23 #include <linux/btrfs.h>
  24 #include <linux/btrfs_tree.h>
  25 #include <linux/workqueue.h>
  26 #include <linux/security.h>
  27 #include <linux/sizes.h>
  28 #include <linux/dynamic_debug.h>
  29 #include <linux/refcount.h>
  30 #include <linux/crc32c.h>
  31 #include "extent_io.h"
  32 #include "extent_map.h"
  33 #include "async-thread.h"
  34
  35 struct btrfs_trans_handle;
  36 struct btrfs_transaction;
  37 struct btrfs_pending_snapshot;
  38 extern struct kmem_cache *btrfs_trans_handle_cachep;
  39 extern struct kmem_cache *btrfs_bit_radix_cachep;
  40 extern struct kmem_cache *btrfs_path_cachep;
  41 extern struct kmem_cache *btrfs_free_space_cachep;
  42 struct btrfs_ordered_sum;
  43
  44 #define BTRFS_MAGIC 0x4D5F53665248425FULL /* ascii _BHRfS_M, no null */
  45
  46 #define BTRFS_MAX_MIRRORS 3
  47
  48 #define BTRFS_MAX_LEVEL 8
  49
  50 #define BTRFS_OLDEST_GENERATION 0ULL
  51
  52 /*
  53  * the max metadata block size.  This limit is somewhat artificial,
  54  * but the memmove costs go through the roof for larger blocks.
  55  */
  56 #define BTRFS_MAX_METADATA_BLOCKSIZE 65536
  57
  58 /*
  59  * we can actually store much bigger names, but lets not confuse the rest
  60  * of linux
  61  */
  62 #define BTRFS_NAME_LEN 255
  63
  64 /*
  65  * Theoretical limit is larger, but we keep this down to a sane
  66  * value. That should limit greatly the possibility of collisions on
  67  * inode ref items.
  68  */
  69 #define BTRFS_LINK_MAX 65535U
  70
  71 /* four bytes for CRC32 */
  72 static const int btrfs_csum_sizes[] = { 4 };
  73
  74 #define BTRFS_EMPTY_DIR_SIZE 0
  75
  76 /* ioprio of readahead is set to idle */
  77 #define BTRFS_IOPRIO_READA (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_IDLE, 0))
  78
  79 #define BTRFS_DIRTY_METADATA_THRESH     SZ_32M
  80
  81 /*
  82  * Use large batch size to reduce overhead of metadata updates.  On the reader
  83  * side, we only read it when we are close to ENOSPC and the read overhead is
  84  * mostly related to the number of CPUs, so it is OK to use arbitrary large
  85  * value here.
  86  */
  87 #define BTRFS_TOTAL_BYTES_PINNED_BATCH  SZ_128M
  88
  89 #define BTRFS_MAX_EXTENT_SIZE SZ_128M
  90
  91
  92 /*
  93  * Count how many BTRFS_MAX_EXTENT_SIZE cover the @size
  94  */
  95 static inline u32 count_max_extents(u64 size)
  96 {
  97         return div_u64(size + BTRFS_MAX_EXTENT_SIZE - 1, BTRFS_MAX_EXTENT_SIZE);
  98 }
  99
 100 struct btrfs_mapping_tree {
 101         struct extent_map_tree map_tree;
 102 };
 103
 104 static inline unsigned long btrfs_chunk_item_size(int num_stripes)
 105 {
 106         BUG_ON(num_stripes == 0);
 107         return sizeof(struct btrfs_chunk) +
 108                 sizeof(struct btrfs_stripe) * (num_stripes - 1);
 109 }
 110
 111 /*
 112  * File system states
 113  */
 114 #define BTRFS_FS_STATE_ERROR            0
 115 #define BTRFS_FS_STATE_REMOUNTING       1
 116 #define BTRFS_FS_STATE_TRANS_ABORTED    2
 117 #define BTRFS_FS_STATE_DEV_REPLACING    3
 118 #define BTRFS_FS_STATE_DUMMY_FS_INFO    4
 119
 120 #define BTRFS_BACKREF_REV_MAX           256
 121 #define BTRFS_BACKREF_REV_SHIFT         56
 122 #define BTRFS_BACKREF_REV_MASK          (((u64)BTRFS_BACKREF_REV_MAX - 1) << \
 123                                          BTRFS_BACKREF_REV_SHIFT)
 124
 125 #define BTRFS_OLD_BACKREF_REV           0
 126 #define BTRFS_MIXED_BACKREF_REV         1
 127
 128 /*
 129  * every tree block (leaf or node) starts with this header.
 130  */
 131 struct btrfs_header {
 132         /* these first four must match the super block */
 133         u8 csum[BTRFS_CSUM_SIZE];
 134         u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
 135         __le64 bytenr; /* which block this node is supposed to live in */
 136         __le64 flags;
 137
 138         /* allowed to be different from the super from here on down */
 139         u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
 140         __le64 generation;
 141         __le64 owner;
 142         __le32 nritems;
 143         u8 level;
 144 } __attribute__ ((__packed__));
 145
 146 /*
 147  * this is a very generous portion of the super block, giving us
 148  * room to translate 14 chunks with 3 stripes each.
 149  */
 150 #define BTRFS_SYSTEM_CHUNK_ARRAY_SIZE 2048
 151
 152 /*
 153  * just in case we somehow lose the roots and are not able to mount,
 154  * we store an array of the roots from previous transactions
 155  * in the super.
 156  */
 157 #define BTRFS_NUM_BACKUP_ROOTS 4
 158 struct btrfs_root_backup {
 159         __le64 tree_root;
 160         __le64 tree_root_gen;
 161
 162         __le64 chunk_root;
 163         __le64 chunk_root_gen;
 164
 165         __le64 extent_root;
 166         __le64 extent_root_gen;
 167
 168         __le64 fs_root;
 169         __le64 fs_root_gen;
 170
 171         __le64 dev_root;
 172         __le64 dev_root_gen;
 173
 174         __le64 csum_root;
 175         __le64 csum_root_gen;
 176
 177         __le64 total_bytes;
 178         __le64 bytes_used;
 179         __le64 num_devices;
 180         /* future */
 181         __le64 unused_64[4];
 182
 183         u8 tree_root_level;
 184         u8 chunk_root_level;
 185         u8 extent_root_level;
 186         u8 fs_root_level;
 187         u8 dev_root_level;
 188         u8 csum_root_level;
 189         /* future and to align */
 190         u8 unused_8[10];
 191 } __attribute__ ((__packed__));
 192
 193 /*
 194  * the super block basically lists the main trees of the FS
 195  * it currently lacks any block count etc etc
 196  */
 197 struct btrfs_super_block {
 198         u8 csum[BTRFS_CSUM_SIZE];
 199         /* the first 4 fields must match struct btrfs_header */
 200         u8 fsid[BTRFS_FSID_SIZE];    /* FS specific uuid */
 201         __le64 bytenr; /* this block number */
 202         __le64 flags;
 203
 204         /* allowed to be different from the btrfs_header from here own down */
 205         __le64 magic;
 206         __le64 generation;
 207         __le64 root;
 208         __le64 chunk_root;
 209         __le64 log_root;
 210
 211         /* this will help find the new super based on the log root */
 212         __le64 log_root_transid;
 213         __le64 total_bytes;
 214         __le64 bytes_used;
 215         __le64 root_dir_objectid;
 216         __le64 num_devices;
 217         __le32 sectorsize;
 218         __le32 nodesize;
 219         __le32 __unused_leafsize;
 220         __le32 stripesize;
 221         __le32 sys_chunk_array_size;
 222         __le64 chunk_root_generation;
 223         __le64 compat_flags;
 224         __le64 compat_ro_flags;
 225         __le64 incompat_flags;
 226         __le16 csum_type;
 227         u8 root_level;
 228         u8 chunk_root_level;
 229         u8 log_root_level;
 230         struct btrfs_dev_item dev_item;
 231
 232         char label[BTRFS_LABEL_SIZE];
 233
 234         __le64 cache_generation;
 235         __le64 uuid_tree_generation;
 236
 237         /* future expansion */
 238         __le64 reserved[30];
 239         u8 sys_chunk_array[BTRFS_SYSTEM_CHUNK_ARRAY_SIZE];
 240         struct btrfs_root_backup super_roots[BTRFS_NUM_BACKUP_ROOTS];
 241 } __attribute__ ((__packed__));
 242
 243 /*
 244  * Compat flags that we support.  If any incompat flags are set other than the
 245  * ones specified below then we will fail to mount
 246  */
 247 #define BTRFS_FEATURE_COMPAT_SUPP               0ULL
 248 #define BTRFS_FEATURE_COMPAT_SAFE_SET           0ULL
 249 #define BTRFS_FEATURE_COMPAT_SAFE_CLEAR         0ULL
 250
 251 #define BTRFS_FEATURE_COMPAT_RO_SUPP                    \
 252         (BTRFS_FEATURE_COMPAT_RO_FREE_SPACE_TREE |      \
 253          BTRFS_FEATURE_COMPAT_RO_FREE_SPACE_TREE_VALID)
 254
 255 #define BTRFS_FEATURE_COMPAT_RO_SAFE_SET        0ULL
 256 #define BTRFS_FEATURE_COMPAT_RO_SAFE_CLEAR      0ULL
 257
 258 #define BTRFS_FEATURE_INCOMPAT_SUPP                     \
 259         (BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF |         \
 260          BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL |        \
 261          BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS |          \
 262          BTRFS_FEATURE_INCOMPAT_BIG_METADATA |          \
 263          BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO |          \
 264          BTRFS_FEATURE_INCOMPAT_COMPRESS_ZSTD |         \
 265          BTRFS_FEATURE_INCOMPAT_RAID56 |                \
 266          BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF |         \
 267          BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA |       \
 268          BTRFS_FEATURE_INCOMPAT_NO_HOLES)
 269
 270 #define BTRFS_FEATURE_INCOMPAT_SAFE_SET                 \
 271         (BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF)
 272 #define BTRFS_FEATURE_INCOMPAT_SAFE_CLEAR               0ULL
 273
 274 /*
 275  * A leaf is full of items. offset and size tell us where to find
 276  * the item in the leaf (relative to the start of the data area)
 277  */
 278 struct btrfs_item {
 279         struct btrfs_disk_key key;
 280         __le32 offset;
 281         __le32 size;
 282 } __attribute__ ((__packed__));
 283
 284 /*
 285  * leaves have an item area and a data area:
 286  * [item0, item1....itemN] [free space] [dataN...data1, data0]
 287  *
 288  * The data is separate from the items to get the keys closer together
 289  * during searches.
 290  */
 291 struct btrfs_leaf {
 292         struct btrfs_header header;
 293         struct btrfs_item items[];
 294 } __attribute__ ((__packed__));
 295
 296 /*
 297  * all non-leaf blocks are nodes, they hold only keys and pointers to
 298  * other blocks
 299  */
 300 struct btrfs_key_ptr {
 301         struct btrfs_disk_key key;
 302         __le64 blockptr;
 303         __le64 generation;
 304 } __attribute__ ((__packed__));
 305
 306 struct btrfs_node {
 307         struct btrfs_header header;
 308         struct btrfs_key_ptr ptrs[];
 309 } __attribute__ ((__packed__));
 310
 311 /*
 312  * btrfs_paths remember the path taken from the root down to the leaf.
 313  * level 0 is always the leaf, and nodes[1...BTRFS_MAX_LEVEL] will point
 314  * to any other levels that are present.
 315  *
 316  * The slots array records the index of the item or block pointer
 317  * used while walking the tree.
 318  */
 319 enum { READA_NONE = 0, READA_BACK, READA_FORWARD };
 320 struct btrfs_path {
 321         struct extent_buffer *nodes[BTRFS_MAX_LEVEL];
 322         int slots[BTRFS_MAX_LEVEL];
 323         /* if there is real range locking, this locks field will change */
 324         u8 locks[BTRFS_MAX_LEVEL];
 325         u8 reada;
 326         /* keep some upper locks as we walk down */
 327         u8 lowest_level;
 328
 329         /*
 330          * set by btrfs_split_item, tells search_slot to keep all locks
 331          * and to force calls to keep space in the nodes
 332          */
 333         unsigned int search_for_split:1;
 334         unsigned int keep_locks:1;
 335         unsigned int skip_locking:1;
 336         unsigned int leave_spinning:1;
 337         unsigned int search_commit_root:1;
 338         unsigned int need_commit_sem:1;
 339         unsigned int skip_release_on_error:1;
 340 };
 341 #define BTRFS_MAX_EXTENT_ITEM_SIZE(r) ((BTRFS_LEAF_DATA_SIZE(r->fs_info) >> 4) - \
 342                                         sizeof(struct btrfs_item))
 343 struct btrfs_dev_replace {
 344         u64 replace_state;      /* see #define above */
 345         time64_t time_started;  /* seconds since 1-Jan-1970 */
 346         time64_t time_stopped;  /* seconds since 1-Jan-1970 */
 347         atomic64_t num_write_errors;
 348         atomic64_t num_uncorrectable_read_errors;
 349
 350         u64 cursor_left;
 351         u64 committed_cursor_left;
 352         u64 cursor_left_last_write_of_item;
 353         u64 cursor_right;
 354
 355         u64 cont_reading_from_srcdev_mode;      /* see #define above */
 356
 357         int is_valid;
 358         int item_needs_writeback;
 359         struct btrfs_device *srcdev;
 360         struct btrfs_device *tgtdev;
 361
 362         struct mutex lock_finishing_cancel_unmount;
 363         rwlock_t lock;
 364         atomic_t blocking_readers;
 365         wait_queue_head_t read_lock_wq;
 366
 367         struct btrfs_scrub_progress scrub_progress;
 368
 369         struct percpu_counter bio_counter;
 370         wait_queue_head_t replace_wait;
 371 };
 372
 373 /* For raid type sysfs entries */
 374 struct raid_kobject {
 375         u64 flags;
 376         struct kobject kobj;
 377         struct list_head list;
 378 };
 379
 380 struct btrfs_space_info {
 381         spinlock_t lock;
 382
 383         u64 total_bytes;        /* total bytes in the space,
 384                                    this doesn't take mirrors into account */
 385         u64 bytes_used;         /* total bytes used,
 386                                    this doesn't take mirrors into account */
 387         u64 bytes_pinned;       /* total bytes pinned, will be freed when the
 388                                    transaction finishes */
 389         u64 bytes_reserved;     /* total bytes the allocator has reserved for
 390                                    current allocations */
 391         u64 bytes_may_use;      /* number of bytes that may be used for
 392                                    delalloc/allocations */
 393         u64 bytes_readonly;     /* total bytes that are read only */
 394
 395         u64 max_extent_size;    /* This will hold the maximum extent size of
 396                                    the space info if we had an ENOSPC in the
 397                                    allocator. */
 398
 399         unsigned int full:1;    /* indicates that we cannot allocate any more
 400                                    chunks for this space */
 401         unsigned int chunk_alloc:1;     /* set if we are allocating a chunk */
 402
 403         unsigned int flush:1;           /* set if we are trying to make space */
 404
 405         unsigned int force_alloc;       /* set if we need to force a chunk
 406                                            alloc for this space */
 407
 408         u64 disk_used;          /* total bytes used on disk */
 409         u64 disk_total;         /* total bytes on disk, takes mirrors into
 410                                    account */
 411
 412         u64 flags;
 413
 414         /*
 415          * bytes_pinned is kept in line with what is actually pinned, as in
 416          * we've called update_block_group and dropped the bytes_used counter
 417          * and increased the bytes_pinned counter.  However this means that
 418          * bytes_pinned does not reflect the bytes that will be pinned once the
 419          * delayed refs are flushed, so this counter is inc'ed every time we
 420          * call btrfs_free_extent so it is a realtime count of what will be
 421          * freed once the transaction is committed.  It will be zeroed every
 422          * time the transaction commits.
 423          */
 424         struct percpu_counter total_bytes_pinned;
 425
 426         struct list_head list;
 427         /* Protected by the spinlock 'lock'. */
 428         struct list_head ro_bgs;
 429         struct list_head priority_tickets;
 430         struct list_head tickets;
 431         /*
 432          * tickets_id just indicates the next ticket will be handled, so note
 433          * it's not stored per ticket.
 434          */
 435         u64 tickets_id;
 436
 437         struct rw_semaphore groups_sem;
 438         /* for block groups in our same type */
 439         struct list_head block_groups[BTRFS_NR_RAID_TYPES];
 440         wait_queue_head_t wait;
 441
 442         struct kobject kobj;
 443         struct kobject *block_group_kobjs[BTRFS_NR_RAID_TYPES];
 444 };
 445
 446 #define BTRFS_BLOCK_RSV_GLOBAL          1
 447 #define BTRFS_BLOCK_RSV_DELALLOC        2
 448 #define BTRFS_BLOCK_RSV_TRANS           3
 449 #define BTRFS_BLOCK_RSV_CHUNK           4
 450 #define BTRFS_BLOCK_RSV_DELOPS          5
 451 #define BTRFS_BLOCK_RSV_EMPTY           6
 452 #define BTRFS_BLOCK_RSV_TEMP            7
 453
 454 struct btrfs_block_rsv {
 455         u64 size;
 456         u64 reserved;
 457         struct btrfs_space_info *space_info;
 458         spinlock_t lock;
 459         unsigned short full;
 460         unsigned short type;
 461         unsigned short failfast;
 462
 463         /*
 464          * Qgroup equivalent for @size @reserved
 465          *
 466          * Unlike normal @size/@reserved for inode rsv, qgroup doesn't care
 467          * about things like csum size nor how many tree blocks it will need to
 468          * reserve.
 469          *
 470          * Qgroup cares more about net change of the extent usage.
 471          *
 472          * So for one newly inserted file extent, in worst case it will cause
 473          * leaf split and level increase, nodesize for each file extent is
 474          * already too much.
 475          *
 476          * In short, qgroup_size/reserved is the upper limit of possible needed
 477          * qgroup metadata reservation.
 478          */
 479         u64 qgroup_rsv_size;
 480         u64 qgroup_rsv_reserved;
 481 };
 482
 483 /*
 484  * free clusters are used to claim free space in relatively large chunks,
 485  * allowing us to do less seeky writes. They are used for all metadata
 486  * allocations. In ssd_spread mode they are also used for data allocations.
 487  */
 488 struct btrfs_free_cluster {
 489         spinlock_t lock;
 490         spinlock_t refill_lock;
 491         struct rb_root root;
 492
 493         /* largest extent in this cluster */
 494         u64 max_size;
 495
 496         /* first extent starting offset */
 497         u64 window_start;
 498
 499         /* We did a full search and couldn't create a cluster */
 500         bool fragmented;
 501
 502         struct btrfs_block_group_cache *block_group;
 503         /*
 504          * when a cluster is allocated from a block group, we put the
 505          * cluster onto a list in the block group so that it can
 506          * be freed before the block group is freed.
 507          */
 508         struct list_head block_group_list;
 509 };
 510
 511 enum btrfs_caching_type {
 512         BTRFS_CACHE_NO          = 0,
 513         BTRFS_CACHE_STARTED     = 1,
 514         BTRFS_CACHE_FAST        = 2,
 515         BTRFS_CACHE_FINISHED    = 3,
 516         BTRFS_CACHE_ERROR       = 4,
 517 };
 518
 519 enum btrfs_disk_cache_state {
 520         BTRFS_DC_WRITTEN        = 0,
 521         BTRFS_DC_ERROR          = 1,
 522         BTRFS_DC_CLEAR          = 2,
 523         BTRFS_DC_SETUP          = 3,
 524 };
 525
 526 struct btrfs_caching_control {
 527         struct list_head list;
 528         struct mutex mutex;
 529         wait_queue_head_t wait;
 530         struct btrfs_work work;
 531         struct btrfs_block_group_cache *block_group;
 532         u64 progress;
 533         refcount_t count;
 534 };
 535
 536 /* Once caching_thread() finds this much free space, it will wake up waiters. */
 537 #define CACHING_CTL_WAKE_UP SZ_2M
 538
 539 struct btrfs_io_ctl {
 540         void *cur, *orig;
 541         struct page *page;
 542         struct page **pages;
 543         struct btrfs_fs_info *fs_info;
 544         struct inode *inode;
 545         unsigned long size;
 546         int index;
 547         int num_pages;
 548         int entries;
 549         int bitmaps;
 550         unsigned check_crcs:1;
 551 };
 552
 553 /*
 554  * Tree to record all locked full stripes of a RAID5/6 block group
 555  */
 556 struct btrfs_full_stripe_locks_tree {
 557         struct rb_root root;
 558         struct mutex lock;
 559 };
 560
 561 struct btrfs_block_group_cache {
 562         struct btrfs_key key;
 563         struct btrfs_block_group_item item;
 564         struct btrfs_fs_info *fs_info;
 565         struct inode *inode;
 566         spinlock_t lock;
 567         u64 pinned;
 568         u64 reserved;
 569         u64 delalloc_bytes;
 570         u64 bytes_super;
 571         u64 flags;
 572         u64 cache_generation;
 573
 574         /*
 575          * If the free space extent count exceeds this number, convert the block
 576          * group to bitmaps.
 577          */
 578         u32 bitmap_high_thresh;
 579
 580         /*
 581          * If the free space extent count drops below this number, convert the
 582          * block group back to extents.
 583          */
 584         u32 bitmap_low_thresh;
 585
 586         /*
 587          * It is just used for the delayed data space allocation because
 588          * only the data space allocation and the relative metadata update
 589          * can be done cross the transaction.
 590          */
 591         struct rw_semaphore data_rwsem;
 592
 593         /* for raid56, this is a full stripe, without parity */
 594         unsigned long full_stripe_len;
 595
 596         unsigned int ro;
 597         unsigned int iref:1;
 598         unsigned int has_caching_ctl:1;
 599         unsigned int removed:1;
 600
 601         int disk_cache_state;
 602
 603         /* cache tracking stuff */
 604         int cached;
 605         struct btrfs_caching_control *caching_ctl;
 606         u64 last_byte_to_unpin;
 607
 608         struct btrfs_space_info *space_info;
 609
 610         /* free space cache stuff */
 611         struct btrfs_free_space_ctl *free_space_ctl;
 612
 613         /* block group cache stuff */
 614         struct rb_node cache_node;
 615
 616         /* for block groups in the same raid type */
 617         struct list_head list;
 618
 619         /* usage count */
 620         atomic_t count;
 621
 622         /* List of struct btrfs_free_clusters for this block group.
 623          * Today it will only have one thing on it, but that may change
 624          */
 625         struct list_head cluster_list;
 626
 627         /* For delayed block group creation or deletion of empty block groups */
 628         struct list_head bg_list;
 629
 630         /* For read-only block groups */
 631         struct list_head ro_list;
 632
 633         atomic_t trimming;
 634
 635         /* For dirty block groups */
 636         struct list_head dirty_list;
 637         struct list_head io_list;
 638
 639         struct btrfs_io_ctl io_ctl;
 640
 641         /*
 642          * Incremented when doing extent allocations and holding a read lock
 643          * on the space_info's groups_sem semaphore.
 644          * Decremented when an ordered extent that represents an IO against this
 645          * block group's range is created (after it's added to its inode's
 646          * root's list of ordered extents) or immediately after the allocation
 647          * if it's a metadata extent or fallocate extent (for these cases we
 648          * don't create ordered extents).
 649          */
 650         atomic_t reservations;
 651
 652         /*
 653          * Incremented while holding the spinlock *lock* by a task checking if
 654          * it can perform a nocow write (incremented if the value for the *ro*
 655          * field is 0). Decremented by such tasks once they create an ordered
 656          * extent or before that if some error happens before reaching that step.
 657          * This is to prevent races between block group relocation and nocow
 658          * writes through direct IO.
 659          */
 660         atomic_t nocow_writers;
 661
 662         /* Lock for free space tree operations. */
 663         struct mutex free_space_lock;
 664
 665         /*
 666          * Does the block group need to be added to the free space tree?
 667          * Protected by free_space_lock.
 668          */
 669         int needs_free_space;
 670
 671         /* Record locked full stripes for RAID5/6 block group */
 672         struct btrfs_full_stripe_locks_tree full_stripe_locks_root;
 673 };
 674
 675 /* delayed seq elem */
 676 struct seq_list {
 677         struct list_head list;
 678         u64 seq;
 679 };
 680
 681 #define SEQ_LIST_INIT(name)     { .list = LIST_HEAD_INIT((name).list), .seq = 0 }
 682
 683 #define SEQ_LAST        ((u64)-1)
 684
 685 enum btrfs_orphan_cleanup_state {
 686         ORPHAN_CLEANUP_STARTED  = 1,
 687         ORPHAN_CLEANUP_DONE     = 2,
 688 };
 689
 690 /* used by the raid56 code to lock stripes for read/modify/write */
 691 struct btrfs_stripe_hash {
 692         struct list_head hash_list;
 693         spinlock_t lock;
 694 };
 695
 696 /* used by the raid56 code to lock stripes for read/modify/write */
 697 struct btrfs_stripe_hash_table {
 698         struct list_head stripe_cache;
 699         spinlock_t cache_lock;
 700         int cache_size;
 701         struct btrfs_stripe_hash table[];
 702 };
 703
 704 #define BTRFS_STRIPE_HASH_TABLE_BITS 11
 705
 706 void btrfs_init_async_reclaim_work(struct work_struct *work);
 707
 708 /* fs_info */
 709 struct reloc_control;
 710 struct btrfs_device;
 711 struct btrfs_fs_devices;
 712 struct btrfs_balance_control;
 713 struct btrfs_delayed_root;
 714
 715 #define BTRFS_FS_BARRIER                        1
 716 #define BTRFS_FS_CLOSING_START                  2
 717 #define BTRFS_FS_CLOSING_DONE                   3
 718 #define BTRFS_FS_LOG_RECOVERING                 4
 719 #define BTRFS_FS_OPEN                           5
 720 #define BTRFS_FS_QUOTA_ENABLED                  6
 721 #define BTRFS_FS_UPDATE_UUID_TREE_GEN           9
 722 #define BTRFS_FS_CREATING_FREE_SPACE_TREE       10
 723 #define BTRFS_FS_BTREE_ERR                      11
 724 #define BTRFS_FS_LOG1_ERR                       12
 725 #define BTRFS_FS_LOG2_ERR                       13
 726 #define BTRFS_FS_QUOTA_OVERRIDE                 14
 727 /* Used to record internally whether fs has been frozen */
 728 #define BTRFS_FS_FROZEN                         15
 729
 730 /*
 731  * Indicate that a whole-filesystem exclusive operation is running
 732  * (device replace, resize, device add/delete, balance)
 733  */
 734 #define BTRFS_FS_EXCL_OP                        16
 735
 736 /*
 737  * To info transaction_kthread we need an immediate commit so it doesn't
 738  * need to wait for commit_interval
 739  */
 740 #define BTRFS_FS_NEED_ASYNC_COMMIT              17
 741
 742 /*
 743  * Indicate that balance has been set up from the ioctl and is in the main
 744  * phase. The fs_info::balance_ctl is initialized.
 745  */
 746 #define BTRFS_FS_BALANCE_RUNNING                18
 747
 748 struct btrfs_fs_info {
 749         u8 fsid[BTRFS_FSID_SIZE];
 750         u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
 751         unsigned long flags;
 752         struct btrfs_root *extent_root;
 753         struct btrfs_root *tree_root;
 754         struct btrfs_root *chunk_root;
 755         struct btrfs_root *dev_root;
 756         struct btrfs_root *fs_root;
 757         struct btrfs_root *csum_root;
 758         struct btrfs_root *quota_root;
 759         struct btrfs_root *uuid_root;
 760         struct btrfs_root *free_space_root;
 761
 762         /* the log root tree is a directory of all the other log roots */
 763         struct btrfs_root *log_root_tree;
 764
 765         spinlock_t fs_roots_radix_lock;
 766         struct radix_tree_root fs_roots_radix;
 767
 768         /* block group cache stuff */
 769         spinlock_t block_group_cache_lock;
 770         u64 first_logical_byte;
 771         struct rb_root block_group_cache_tree;
 772
 773         /* keep track of unallocated space */
 774         atomic64_t free_chunk_space;
 775
 776         struct extent_io_tree freed_extents[2];
 777         struct extent_io_tree *pinned_extents;
 778
 779         /* logical->physical extent mapping */
 780         struct btrfs_mapping_tree mapping_tree;
 781
 782         /*
 783          * block reservation for extent, checksum, root tree and
 784          * delayed dir index item
 785          */
 786         struct btrfs_block_rsv global_block_rsv;
 787         /* block reservation for metadata operations */
 788         struct btrfs_block_rsv trans_block_rsv;
 789         /* block reservation for chunk tree */
 790         struct btrfs_block_rsv chunk_block_rsv;
 791         /* block reservation for delayed operations */
 792         struct btrfs_block_rsv delayed_block_rsv;
 793
 794         struct btrfs_block_rsv empty_block_rsv;
 795
 796         u64 generation;
 797         u64 last_trans_committed;
 798         u64 avg_delayed_ref_runtime;
 799
 800         /*
 801          * this is updated to the current trans every time a full commit
 802          * is required instead of the faster short fsync log commits
 803          */
 804         u64 last_trans_log_full_commit;
 805         unsigned long mount_opt;
 806         /*
 807          * Track requests for actions that need to be done during transaction
 808          * commit (like for some mount options).
 809          */
 810         unsigned long pending_changes;
 811         unsigned long compress_type:4;
 812         unsigned int compress_level;
 813         u32 commit_interval;
 814         /*
 815          * It is a suggestive number, the read side is safe even it gets a
 816          * wrong number because we will write out the data into a regular
 817          * extent. The write side(mount/remount) is under ->s_umount lock,
 818          * so it is also safe.
 819          */
 820         u64 max_inline;
 821
 822         struct btrfs_transaction *running_transaction;
 823         wait_queue_head_t transaction_throttle;
 824         wait_queue_head_t transaction_wait;
 825         wait_queue_head_t transaction_blocked_wait;
 826         wait_queue_head_t async_submit_wait;
 827
 828         /*
 829          * Used to protect the incompat_flags, compat_flags, compat_ro_flags
 830          * when they are updated.
 831          *
 832          * Because we do not clear the flags for ever, so we needn't use
 833          * the lock on the read side.
 834          *
 835          * We also needn't use the lock when we mount the fs, because
 836          * there is no other task which will update the flag.
 837          */
 838         spinlock_t super_lock;
 839         struct btrfs_super_block *super_copy;
 840         struct btrfs_super_block *super_for_commit;
 841         struct super_block *sb;
 842         struct inode *btree_inode;
 843         struct mutex tree_log_mutex;
 844         struct mutex transaction_kthread_mutex;
 845         struct mutex cleaner_mutex;
 846         struct mutex chunk_mutex;
 847
 848         /*
 849          * this is taken to make sure we don't set block groups ro after
 850          * the free space cache has been allocated on them
 851          */
 852         struct mutex ro_block_group_mutex;
 853
 854         /* this is used during read/modify/write to make sure
 855          * no two ios are trying to mod the same stripe at the same
 856          * time
 857          */
 858         struct btrfs_stripe_hash_table *stripe_hash_table;
 859
 860         /*
 861          * this protects the ordered operations list only while we are
 862          * processing all of the entries on it.  This way we make
 863          * sure the commit code doesn't find the list temporarily empty
 864          * because another function happens to be doing non-waiting preflush
 865          * before jumping into the main commit.
 866          */
 867         struct mutex ordered_operations_mutex;
 868
 869         struct rw_semaphore commit_root_sem;
 870
 871         struct rw_semaphore cleanup_work_sem;
 872
 873         struct rw_semaphore subvol_sem;
 874         struct srcu_struct subvol_srcu;
 875
 876         spinlock_t trans_lock;
 877         /*
 878          * the reloc mutex goes with the trans lock, it is taken
 879          * during commit to protect us from the relocation code
 880          */
 881         struct mutex reloc_mutex;
 882
 883         struct list_head trans_list;
 884         struct list_head dead_roots;
 885         struct list_head caching_block_groups;
 886
 887         spinlock_t delayed_iput_lock;
 888         struct list_head delayed_iputs;
 889         struct mutex cleaner_delayed_iput_mutex;
 890
 891         /* this protects tree_mod_seq_list */
 892         spinlock_t tree_mod_seq_lock;
 893         atomic64_t tree_mod_seq;
 894         struct list_head tree_mod_seq_list;
 895
 896         /* this protects tree_mod_log */
 897         rwlock_t tree_mod_log_lock;
 898         struct rb_root tree_mod_log;
 899
 900         atomic_t async_delalloc_pages;
 901
 902         /*
 903          * this is used to protect the following list -- ordered_roots.
 904          */
 905         spinlock_t ordered_root_lock;
 906
 907         /*
 908          * all fs/file tree roots in which there are data=ordered extents
 909          * pending writeback are added into this list.
 910          *
 911          * these can span multiple transactions and basically include
 912          * every dirty data page that isn't from nodatacow
 913          */
 914         struct list_head ordered_roots;
 915
 916         struct mutex delalloc_root_mutex;
 917         spinlock_t delalloc_root_lock;
 918         /* all fs/file tree roots that have delalloc inodes. */
 919         struct list_head delalloc_roots;
 920
 921         /*
 922          * there is a pool of worker threads for checksumming during writes
 923          * and a pool for checksumming after reads.  This is because readers
 924          * can run with FS locks held, and the writers may be waiting for
 925          * those locks.  We don't want ordering in the pending list to cause
 926          * deadlocks, and so the two are serviced separately.
 927          *
 928          * A third pool does submit_bio to avoid deadlocking with the other
 929          * two
 930          */
 931         struct btrfs_workqueue *workers;
 932         struct btrfs_workqueue *delalloc_workers;
 933         struct btrfs_workqueue *flush_workers;
 934         struct btrfs_workqueue *endio_workers;
 935         struct btrfs_workqueue *endio_meta_workers;
 936         struct btrfs_workqueue *endio_raid56_workers;
 937         struct btrfs_workqueue *endio_repair_workers;
 938         struct btrfs_workqueue *rmw_workers;
 939         struct btrfs_workqueue *endio_meta_write_workers;
 940         struct btrfs_workqueue *endio_write_workers;
 941         struct btrfs_workqueue *endio_freespace_worker;
 942         struct btrfs_workqueue *submit_workers;
 943         struct btrfs_workqueue *caching_workers;
 944         struct btrfs_workqueue *readahead_workers;
 945
 946         /*
 947          * fixup workers take dirty pages that didn't properly go through
 948          * the cow mechanism and make them safe to write.  It happens
 949          * for the sys_munmap function call path
 950          */
 951         struct btrfs_workqueue *fixup_workers;
 952         struct btrfs_workqueue *delayed_workers;
 953
 954         /* the extent workers do delayed refs on the extent allocation tree */
 955         struct btrfs_workqueue *extent_workers;
 956         struct task_struct *transaction_kthread;
 957         struct task_struct *cleaner_kthread;
 958         u32 thread_pool_size;
 959
 960         struct kobject *space_info_kobj;
 961         struct list_head pending_raid_kobjs;
 962         spinlock_t pending_raid_kobjs_lock; /* uncontended */
 963
 964         u64 total_pinned;
 965
 966         /* used to keep from writing metadata until there is a nice batch */
 967         struct percpu_counter dirty_metadata_bytes;
 968         struct percpu_counter delalloc_bytes;
 969         s32 dirty_metadata_batch;
 970         s32 delalloc_batch;
 971
 972         struct list_head dirty_cowonly_roots;
 973
 974         struct btrfs_fs_devices *fs_devices;
 975
 976         /*
 977          * The space_info list is effectively read only after initial
 978          * setup.  It is populated at mount time and cleaned up after
 979          * all block groups are removed.  RCU is used to protect it.
 980          */
 981         struct list_head space_info;
 982
 983         struct btrfs_space_info *data_sinfo;
 984
 985         struct reloc_control *reloc_ctl;
 986
 987         /* data_alloc_cluster is only used in ssd_spread mode */
 988         struct btrfs_free_cluster data_alloc_cluster;
 989
 990         /* all metadata allocations go through this cluster */
 991         struct btrfs_free_cluster meta_alloc_cluster;
 992
 993         /* auto defrag inodes go here */
 994         spinlock_t defrag_inodes_lock;
 995         struct rb_root defrag_inodes;
 996         atomic_t defrag_running;
 997
 998         /* Used to protect avail_{data, metadata, system}_alloc_bits */
 999         seqlock_t profiles_lock;
1000         /*
1001          * these three are in extended format (availability of single
1002          * chunks is denoted by BTRFS_AVAIL_ALLOC_BIT_SINGLE bit, other
1003          * types are denoted by corresponding BTRFS_BLOCK_GROUP_* bits)
1004          */
1005         u64 avail_data_alloc_bits;
1006         u64 avail_metadata_alloc_bits;
1007         u64 avail_system_alloc_bits;
1008
1009         /* restriper state */
1010         spinlock_t balance_lock;
1011         struct mutex balance_mutex;
1012         atomic_t balance_pause_req;
1013         atomic_t balance_cancel_req;
1014         struct btrfs_balance_control *balance_ctl;
1015         wait_queue_head_t balance_wait_q;
1016
1017         u32 data_chunk_allocations;
1018         u32 metadata_ratio;
1019
1020         void *bdev_holder;
1021
1022         /* private scrub information */
1023         struct mutex scrub_lock;
1024         atomic_t scrubs_running;
1025         atomic_t scrub_pause_req;
1026         atomic_t scrubs_paused;
1027         atomic_t scrub_cancel_req;
1028         wait_queue_head_t scrub_pause_wait;
1029         int scrub_workers_refcnt;
1030         struct btrfs_workqueue *scrub_workers;
1031         struct btrfs_workqueue *scrub_wr_completion_workers;
1032         struct btrfs_workqueue *scrub_nocow_workers;
1033         struct btrfs_workqueue *scrub_parity_workers;
1034
1035 #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY
1036         u32 check_integrity_print_mask;
1037 #endif
1038         /* is qgroup tracking in a consistent state? */
1039         u64 qgroup_flags;
1040
1041         /* holds configuration and tracking. Protected by qgroup_lock */
1042         struct rb_root qgroup_tree;
1043         struct rb_root qgroup_op_tree;
1044         spinlock_t qgroup_lock;
1045         spinlock_t qgroup_op_lock;
1046         atomic_t qgroup_op_seq;
1047
1048         /*
1049          * used to avoid frequently calling ulist_alloc()/ulist_free()
1050          * when doing qgroup accounting, it must be protected by qgroup_lock.
1051          */
1052         struct ulist *qgroup_ulist;
1053
1054         /* protect user change for quota operations */
1055         struct mutex qgroup_ioctl_lock;
1056
1057         /* list of dirty qgroups to be written at next commit */
1058         struct list_head dirty_qgroups;
1059
1060         /* used by qgroup for an efficient tree traversal */
1061         u64 qgroup_seq;
1062
1063         /* qgroup rescan items */
1064         struct mutex qgroup_rescan_lock; /* protects the progress item */
1065         struct btrfs_key qgroup_rescan_progress;
1066         struct btrfs_workqueue *qgroup_rescan_workers;
1067         struct completion qgroup_rescan_completion;
1068         struct btrfs_work qgroup_rescan_work;
1069         bool qgroup_rescan_running;     /* protected by qgroup_rescan_lock */
1070
1071         /* filesystem state */
1072         unsigned long fs_state;
1073
1074         struct btrfs_delayed_root *delayed_root;
1075
1076         /* readahead tree */
1077         spinlock_t reada_lock;
1078         struct radix_tree_root reada_tree;
1079
1080         /* readahead works cnt */
1081         atomic_t reada_works_cnt;
1082
1083         /* Extent buffer radix tree */
1084         spinlock_t buffer_lock;
1085         struct radix_tree_root buffer_radix;
1086
1087         /* next backup root to be overwritten */
1088         int backup_root_index;
1089
1090         /* device replace state */
1091         struct btrfs_dev_replace dev_replace;
1092
1093         struct semaphore uuid_tree_rescan_sem;
1094
1095         /* Used to reclaim the metadata space in the background. */
1096         struct work_struct async_reclaim_work;
1097
1098         spinlock_t unused_bgs_lock;
1099         struct list_head unused_bgs;
1100         struct mutex unused_bg_unpin_mutex;
1101         struct mutex delete_unused_bgs_mutex;
1102
1103         /* For btrfs to record security options */
1104         struct security_mnt_opts security_opts;
1105
1106         /*
1107          * Chunks that can't be freed yet (under a trim/discard operation)
1108          * and will be latter freed. Protected by fs_info->chunk_mutex.
1109          */
1110         struct list_head pinned_chunks;
1111
1112         /* Cached block sizes */
1113         u32 nodesize;
1114         u32 sectorsize;
1115         u32 stripesize;
1116
1117 #ifdef CONFIG_BTRFS_FS_REF_VERIFY
1118         spinlock_t ref_verify_lock;
1119         struct rb_root block_tree;
1120 #endif
1121 };
1122
1123 static inline struct btrfs_fs_info *btrfs_sb(struct super_block *sb)
1124 {
1125         return sb->s_fs_info;
1126 }
1127
1128 struct btrfs_subvolume_writers {
1129         struct percpu_counter   counter;
1130         wait_queue_head_t       wait;
1131 };
1132
1133 /*
1134  * The state of btrfs root
1135  */
1136 /*
1137  * btrfs_record_root_in_trans is a multi-step process,
1138  * and it can race with the balancing code.   But the
1139  * race is very small, and only the first time the root
1140  * is added to each transaction.  So IN_TRANS_SETUP
1141  * is used to tell us when more checks are required
1142  */
1143 #define BTRFS_ROOT_IN_TRANS_SETUP       0
1144 #define BTRFS_ROOT_REF_COWS             1
1145 #define BTRFS_ROOT_TRACK_DIRTY          2
1146 #define BTRFS_ROOT_IN_RADIX             3
1147 #define BTRFS_ROOT_ORPHAN_ITEM_INSERTED 4
1148 #define BTRFS_ROOT_DEFRAG_RUNNING       5
1149 #define BTRFS_ROOT_FORCE_COW            6
1150 #define BTRFS_ROOT_MULTI_LOG_TASKS      7
1151 #define BTRFS_ROOT_DIRTY                8
1152
1153 /*
1154  * in ram representation of the tree.  extent_root is used for all allocations
1155  * and for the extent tree extent_root root.
1156  */
1157 struct btrfs_root {
1158         struct extent_buffer *node;
1159
1160         struct extent_buffer *commit_root;
1161         struct btrfs_root *log_root;
1162         struct btrfs_root *reloc_root;
1163
1164         unsigned long state;
1165         struct btrfs_root_item root_item;
1166         struct btrfs_key root_key;
1167         struct btrfs_fs_info *fs_info;
1168         struct extent_io_tree dirty_log_pages;
1169
1170         struct mutex objectid_mutex;
1171
1172         spinlock_t accounting_lock;
1173         struct btrfs_block_rsv *block_rsv;
1174
1175         /* free ino cache stuff */
1176         struct btrfs_free_space_ctl *free_ino_ctl;
1177         enum btrfs_caching_type ino_cache_state;
1178         spinlock_t ino_cache_lock;
1179         wait_queue_head_t ino_cache_wait;
1180         struct btrfs_free_space_ctl *free_ino_pinned;
1181         u64 ino_cache_progress;
1182         struct inode *ino_cache_inode;
1183
1184         struct mutex log_mutex;
1185         wait_queue_head_t log_writer_wait;
1186         wait_queue_head_t log_commit_wait[2];
1187         struct list_head log_ctxs[2];
1188         atomic_t log_writers;
1189         atomic_t log_commit[2];
1190         atomic_t log_batch;
1191         int log_transid;
1192         /* No matter the commit succeeds or not*/
1193         int log_transid_committed;
1194         /* Just be updated when the commit succeeds. */
1195         int last_log_commit;
1196         pid_t log_start_pid;
1197
1198         u64 last_trans;
1199
1200         u32 type;
1201
1202         u64 highest_objectid;
1203
1204         u64 defrag_trans_start;
1205         struct btrfs_key defrag_progress;
1206         struct btrfs_key defrag_max;
1207
1208         /* the dirty list is only used by non-reference counted roots */
1209         struct list_head dirty_list;
1210
1211         struct list_head root_list;
1212
1213         spinlock_t log_extents_lock[2];
1214         struct list_head logged_list[2];
1215
1216         int orphan_cleanup_state;
1217
1218         spinlock_t inode_lock;
1219         /* red-black tree that keeps track of in-memory inodes */
1220         struct rb_root inode_tree;
1221
1222         /*
1223          * radix tree that keeps track of delayed nodes of every inode,
1224          * protected by inode_lock
1225          */
1226         struct radix_tree_root delayed_nodes_tree;
1227         /*
1228          * right now this just gets used so that a root has its own devid
1229          * for stat.  It may be used for more later
1230          */
1231         dev_t anon_dev;
1232
1233         spinlock_t root_item_lock;
1234         refcount_t refs;
1235
1236         struct mutex delalloc_mutex;
1237         spinlock_t delalloc_lock;
1238         /*
1239          * all of the inodes that have delalloc bytes.  It is possible for
1240          * this list to be empty even when there is still dirty data=ordered
1241          * extents waiting to finish IO.
1242          */
1243         struct list_head delalloc_inodes;
1244         struct list_head delalloc_root;
1245         u64 nr_delalloc_inodes;
1246
1247         struct mutex ordered_extent_mutex;
1248         /*
1249          * this is used by the balancing code to wait for all the pending
1250          * ordered extents
1251          */
1252         spinlock_t ordered_extent_lock;
1253
1254         /*
1255          * all of the data=ordered extents pending writeback
1256          * these can span multiple transactions and basically include
1257          * every dirty data page that isn't from nodatacow
1258          */
1259         struct list_head ordered_extents;
1260         struct list_head ordered_root;
1261         u64 nr_ordered_extents;
1262
1263         /*
1264          * Number of currently running SEND ioctls to prevent
1265          * manipulation with the read-only status via SUBVOL_SETFLAGS
1266          */
1267         int send_in_progress;
1268         struct btrfs_subvolume_writers *subv_writers;
1269         atomic_t will_be_snapshotted;
1270         atomic_t snapshot_force_cow;
1271
1272         /* For qgroup metadata reserved space */
1273         spinlock_t qgroup_meta_rsv_lock;
1274         u64 qgroup_meta_rsv_pertrans;
1275         u64 qgroup_meta_rsv_prealloc;
1276
1277 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
1278         u64 alloc_bytenr;
1279 #endif
1280 };
1281
1282 struct btrfs_file_private {
1283         void *filldir_buf;
1284 };
1285
1286 static inline u32 btrfs_inode_sectorsize(const struct inode *inode)
1287 {
1288         return btrfs_sb(inode->i_sb)->sectorsize;
1289 }
1290
1291 static inline u32 BTRFS_LEAF_DATA_SIZE(const struct btrfs_fs_info *info)
1292 {
1293
1294         return info->nodesize - sizeof(struct btrfs_header);
1295 }
1296
1297 #define BTRFS_LEAF_DATA_OFFSET          offsetof(struct btrfs_leaf, items)
1298
1299 static inline u32 BTRFS_MAX_ITEM_SIZE(const struct btrfs_fs_info *info)
1300 {
1301         return BTRFS_LEAF_DATA_SIZE(info) - sizeof(struct btrfs_item);
1302 }
1303
1304 static inline u32 BTRFS_NODEPTRS_PER_BLOCK(const struct btrfs_fs_info *info)
1305 {
1306         return BTRFS_LEAF_DATA_SIZE(info) / sizeof(struct btrfs_key_ptr);
1307 }
1308
1309 #define BTRFS_FILE_EXTENT_INLINE_DATA_START             \
1310                 (offsetof(struct btrfs_file_extent_item, disk_bytenr))
1311 static inline u32 BTRFS_MAX_INLINE_DATA_SIZE(const struct btrfs_fs_info *info)
1312 {
1313         return BTRFS_MAX_ITEM_SIZE(info) -
1314                BTRFS_FILE_EXTENT_INLINE_DATA_START;
1315 }
1316
1317 static inline u32 BTRFS_MAX_XATTR_SIZE(const struct btrfs_fs_info *info)
1318 {
1319         return BTRFS_MAX_ITEM_SIZE(info) - sizeof(struct btrfs_dir_item);
1320 }
1321
1322 /*
1323  * Flags for mount options.
1324  *
1325  * Note: don't forget to add new options to btrfs_show_options()
1326  */
1327 #define BTRFS_MOUNT_NODATASUM           (1 << 0)
1328 #define BTRFS_MOUNT_NODATACOW           (1 << 1)
1329 #define BTRFS_MOUNT_NOBARRIER           (1 << 2)
1330 #define BTRFS_MOUNT_SSD                 (1 << 3)
1331 #define BTRFS_MOUNT_DEGRADED            (1 << 4)
1332 #define BTRFS_MOUNT_COMPRESS            (1 << 5)
1333 #define BTRFS_MOUNT_NOTREELOG           (1 << 6)
1334 #define BTRFS_MOUNT_FLUSHONCOMMIT       (1 << 7)
1335 #define BTRFS_MOUNT_SSD_SPREAD          (1 << 8)
1336 #define BTRFS_MOUNT_NOSSD               (1 << 9)
1337 #define BTRFS_MOUNT_DISCARD             (1 << 10)
1338 #define BTRFS_MOUNT_FORCE_COMPRESS      (1 << 11)
1339 #define BTRFS_MOUNT_SPACE_CACHE         (1 << 12)
1340 #define BTRFS_MOUNT_CLEAR_CACHE         (1 << 13)
1341 #define BTRFS_MOUNT_USER_SUBVOL_RM_ALLOWED (1 << 14)
1342 #define BTRFS_MOUNT_ENOSPC_DEBUG         (1 << 15)
1343 #define BTRFS_MOUNT_AUTO_DEFRAG         (1 << 16)
1344 #define BTRFS_MOUNT_INODE_MAP_CACHE     (1 << 17)
1345 #define BTRFS_MOUNT_USEBACKUPROOT       (1 << 18)
1346 #define BTRFS_MOUNT_SKIP_BALANCE        (1 << 19)
1347 #define BTRFS_MOUNT_CHECK_INTEGRITY     (1 << 20)
1348 #define BTRFS_MOUNT_CHECK_INTEGRITY_INCLUDING_EXTENT_DATA (1 << 21)
1349 #define BTRFS_MOUNT_PANIC_ON_FATAL_ERROR        (1 << 22)
1350 #define BTRFS_MOUNT_RESCAN_UUID_TREE    (1 << 23)
1351 #define BTRFS_MOUNT_FRAGMENT_DATA       (1 << 24)
1352 #define BTRFS_MOUNT_FRAGMENT_METADATA   (1 << 25)
1353 #define BTRFS_MOUNT_FREE_SPACE_TREE     (1 << 26)
1354 #define BTRFS_MOUNT_NOLOGREPLAY         (1 << 27)
1355 #define BTRFS_MOUNT_REF_VERIFY          (1 << 28)
1356
1357 #define BTRFS_DEFAULT_COMMIT_INTERVAL   (30)
1358 #define BTRFS_DEFAULT_MAX_INLINE        (2048)
1359
1360 #define btrfs_clear_opt(o, opt)         ((o) &= ~BTRFS_MOUNT_##opt)
1361 #define btrfs_set_opt(o, opt)           ((o) |= BTRFS_MOUNT_##opt)
1362 #define btrfs_raw_test_opt(o, opt)      ((o) & BTRFS_MOUNT_##opt)
1363 #define btrfs_test_opt(fs_info, opt)    ((fs_info)->mount_opt & \
1364                                          BTRFS_MOUNT_##opt)
1365
1366 #define btrfs_set_and_info(fs_info, opt, fmt, args...)                  \
1367 {                                                                       \
1368         if (!btrfs_test_opt(fs_info, opt))                              \
1369                 btrfs_info(fs_info, fmt, ##args);                       \
1370         btrfs_set_opt(fs_info->mount_opt, opt);                         \
1371 }
1372
1373 #define btrfs_clear_and_info(fs_info, opt, fmt, args...)                \
1374 {                                                                       \
1375         if (btrfs_test_opt(fs_info, opt))                               \
1376                 btrfs_info(fs_info, fmt, ##args);                       \
1377         btrfs_clear_opt(fs_info->mount_opt, opt);                       \
1378 }
1379
1380 #ifdef CONFIG_BTRFS_DEBUG
1381 static inline int
1382 btrfs_should_fragment_free_space(struct btrfs_block_group_cache *block_group)
1383 {
1384         struct btrfs_fs_info *fs_info = block_group->fs_info;
1385
1386         return (btrfs_test_opt(fs_info, FRAGMENT_METADATA) &&
1387                 block_group->flags & BTRFS_BLOCK_GROUP_METADATA) ||
1388                (btrfs_test_opt(fs_info, FRAGMENT_DATA) &&
1389                 block_group->flags &  BTRFS_BLOCK_GROUP_DATA);
1390 }
1391 #endif
1392
1393 /*
1394  * Requests for changes that need to be done during transaction commit.
1395  *
1396  * Internal mount options that are used for special handling of the real
1397  * mount options (eg. cannot be set during remount and have to be set during
1398  * transaction commit)
1399  */
1400
1401 #define BTRFS_PENDING_SET_INODE_MAP_CACHE       (0)
1402 #define BTRFS_PENDING_CLEAR_INODE_MAP_CACHE     (1)
1403 #define BTRFS_PENDING_COMMIT                    (2)
1404
1405 #define btrfs_test_pending(info, opt)   \
1406         test_bit(BTRFS_PENDING_##opt, &(info)->pending_changes)
1407 #define btrfs_set_pending(info, opt)    \
1408         set_bit(BTRFS_PENDING_##opt, &(info)->pending_changes)
1409 #define btrfs_clear_pending(info, opt)  \
1410         clear_bit(BTRFS_PENDING_##opt, &(info)->pending_changes)
1411
1412 /*
1413  * Helpers for setting pending mount option changes.
1414  *
1415  * Expects corresponding macros
1416  * BTRFS_PENDING_SET_ and CLEAR_ + short mount option name
1417  */
1418 #define btrfs_set_pending_and_info(info, opt, fmt, args...)            \
1419 do {                                                                   \
1420        if (!btrfs_raw_test_opt((info)->mount_opt, opt)) {              \
1421                btrfs_info((info), fmt, ##args);                        \
1422                btrfs_set_pending((info), SET_##opt);                   \
1423                btrfs_clear_pending((info), CLEAR_##opt);               \
1424        }                                                               \
1425 } while(0)
1426
1427 #define btrfs_clear_pending_and_info(info, opt, fmt, args...)          \
1428 do {                                                                   \
1429        if (btrfs_raw_test_opt((info)->mount_opt, opt)) {               \
1430                btrfs_info((info), fmt, ##args);                        \
1431                btrfs_set_pending((info), CLEAR_##opt);                 \
1432                btrfs_clear_pending((info), SET_##opt);                 \
1433        }                                                               \
1434 } while(0)
1435
1436 /*
1437  * Inode flags
1438  */
1439 #define BTRFS_INODE_NODATASUM           (1 << 0)
1440 #define BTRFS_INODE_NODATACOW           (1 << 1)
1441 #define BTRFS_INODE_READONLY            (1 << 2)
1442 #define BTRFS_INODE_NOCOMPRESS          (1 << 3)
1443 #define BTRFS_INODE_PREALLOC            (1 << 4)
1444 #define BTRFS_INODE_SYNC                (1 << 5)
1445 #define BTRFS_INODE_IMMUTABLE           (1 << 6)
1446 #define BTRFS_INODE_APPEND              (1 << 7)
1447 #define BTRFS_INODE_NODUMP              (1 << 8)
1448 #define BTRFS_INODE_NOATIME             (1 << 9)
1449 #define BTRFS_INODE_DIRSYNC             (1 << 10)
1450 #define BTRFS_INODE_COMPRESS            (1 << 11)
1451
1452 #define BTRFS_INODE_ROOT_ITEM_INIT      (1 << 31)
1453
1454 struct btrfs_map_token {
1455         const struct extent_buffer *eb;
1456         char *kaddr;
1457         unsigned long offset;
1458 };
1459
1460 #define BTRFS_BYTES_TO_BLKS(fs_info, bytes) \
1461                                 ((bytes) >> (fs_info)->sb->s_blocksize_bits)
1462
1463 static inline void btrfs_init_map_token (struct btrfs_map_token *token)
1464 {
1465         token->kaddr = NULL;
1466 }
1467
1468 /* some macros to generate set/get functions for the struct fields.  This
1469  * assumes there is a lefoo_to_cpu for every type, so lets make a simple
1470  * one for u8:
1471  */
1472 #define le8_to_cpu(v) (v)
1473 #define cpu_to_le8(v) (v)
1474 #define __le8 u8
1475
1476 #define read_eb_member(eb, ptr, type, member, result) (\
1477         read_extent_buffer(eb, (char *)(result),                        \
1478                            ((unsigned long)(ptr)) +                     \
1479                             offsetof(type, member),                     \
1480                            sizeof(((type *)0)->member)))
1481
1482 #define write_eb_member(eb, ptr, type, member, result) (\
1483         write_extent_buffer(eb, (char *)(result),                       \
1484                            ((unsigned long)(ptr)) +                     \
1485                             offsetof(type, member),                     \
1486                            sizeof(((type *)0)->member)))
1487
1488 #define DECLARE_BTRFS_SETGET_BITS(bits)                                 \
1489 u##bits btrfs_get_token_##bits(const struct extent_buffer *eb,          \
1490                                const void *ptr, unsigned long off,      \
1491                                struct btrfs_map_token *token);          \
1492 void btrfs_set_token_##bits(struct extent_buffer *eb, const void *ptr,  \
1493                             unsigned long off, u##bits val,             \
1494                             struct btrfs_map_token *token);             \
1495 static inline u##bits btrfs_get_##bits(const struct extent_buffer *eb,  \
1496                                        const void *ptr,                 \
1497                                        unsigned long off)               \
1498 {                                                                       \
1499         return btrfs_get_token_##bits(eb, ptr, off, NULL);              \
1500 }                                                                       \
1501 static inline void btrfs_set_##bits(struct extent_buffer *eb, void *ptr,\
1502                                     unsigned long off, u##bits val)     \
1503 {                                                                       \
1504        btrfs_set_token_##bits(eb, ptr, off, val, NULL);                 \
1505 }
1506
1507 DECLARE_BTRFS_SETGET_BITS(8)
1508 DECLARE_BTRFS_SETGET_BITS(16)
1509 DECLARE_BTRFS_SETGET_BITS(32)
1510 DECLARE_BTRFS_SETGET_BITS(64)
1511
1512 #define BTRFS_SETGET_FUNCS(name, type, member, bits)                    \
1513 static inline u##bits btrfs_##name(const struct extent_buffer *eb,      \
1514                                    const type *s)                       \
1515 {                                                                       \
1516         BUILD_BUG_ON(sizeof(u##bits) != sizeof(((type *)0))->member);   \
1517         return btrfs_get_##bits(eb, s, offsetof(type, member));         \
1518 }                                                                       \
1519 static inline void btrfs_set_##name(struct extent_buffer *eb, type *s,  \
1520                                     u##bits val)                        \
1521 {                                                                       \
1522         BUILD_BUG_ON(sizeof(u##bits) != sizeof(((type *)0))->member);   \
1523         btrfs_set_##bits(eb, s, offsetof(type, member), val);           \
1524 }                                                                       \
1525 static inline u##bits btrfs_token_##name(const struct extent_buffer *eb,\
1526                                          const type *s,                 \
1527                                          struct btrfs_map_token *token) \
1528 {                                                                       \
1529         BUILD_BUG_ON(sizeof(u##bits) != sizeof(((type *)0))->member);   \
1530         return btrfs_get_token_##bits(eb, s, offsetof(type, member), token); \
1531 }                                                                       \
1532 static inline void btrfs_set_token_##name(struct extent_buffer *eb,     \
1533                                           type *s, u##bits val,         \
1534                                          struct btrfs_map_token *token) \
1535 {                                                                       \
1536         BUILD_BUG_ON(sizeof(u##bits) != sizeof(((type *)0))->member);   \
1537         btrfs_set_token_##bits(eb, s, offsetof(type, member), val, token); \
1538 }
1539
1540 #define BTRFS_SETGET_HEADER_FUNCS(name, type, member, bits)             \
1541 static inline u##bits btrfs_##name(const struct extent_buffer *eb)      \
1542 {                                                                       \
1543         const type *p = page_address(eb->pages[0]);                     \
1544         u##bits res = le##bits##_to_cpu(p->member);                     \
1545         return res;                                                     \
1546 }                                                                       \
1547 static inline void btrfs_set_##name(struct extent_buffer *eb,           \
1548                                     u##bits val)                        \
1549 {                                                                       \
1550         type *p = page_address(eb->pages[0]);                           \
1551         p->member = cpu_to_le##bits(val);                               \
1552 }
1553
1554 #define BTRFS_SETGET_STACK_FUNCS(name, type, member, bits)              \
1555 static inline u##bits btrfs_##name(const type *s)                       \
1556 {                                                                       \
1557         return le##bits##_to_cpu(s->member);                            \
1558 }                                                                       \
1559 static inline void btrfs_set_##name(type *s, u##bits val)               \
1560 {                                                                       \
1561         s->member = cpu_to_le##bits(val);                               \
1562 }
1563
1564
1565 static inline u64 btrfs_device_total_bytes(struct extent_buffer *eb,
1566                                            struct btrfs_dev_item *s)
1567 {
1568         BUILD_BUG_ON(sizeof(u64) !=
1569                      sizeof(((struct btrfs_dev_item *)0))->total_bytes);
1570         return btrfs_get_64(eb, s, offsetof(struct btrfs_dev_item,
1571                                             total_bytes));
1572 }
1573 static inline void btrfs_set_device_total_bytes(struct extent_buffer *eb,
1574                                                 struct btrfs_dev_item *s,
1575                                                 u64 val)
1576 {
1577         BUILD_BUG_ON(sizeof(u64) !=
1578                      sizeof(((struct btrfs_dev_item *)0))->total_bytes);
1579         WARN_ON(!IS_ALIGNED(val, eb->fs_info->sectorsize));
1580         btrfs_set_64(eb, s, offsetof(struct btrfs_dev_item, total_bytes), val);
1581 }
1582
1583
1584 BTRFS_SETGET_FUNCS(device_type, struct btrfs_dev_item, type, 64);
1585 BTRFS_SETGET_FUNCS(device_bytes_used, struct btrfs_dev_item, bytes_used, 64);
1586 BTRFS_SETGET_FUNCS(device_io_align, struct btrfs_dev_item, io_align, 32);
1587 BTRFS_SETGET_FUNCS(device_io_width, struct btrfs_dev_item, io_width, 32);
1588 BTRFS_SETGET_FUNCS(device_start_offset, struct btrfs_dev_item,
1589                    start_offset, 64);
1590 BTRFS_SETGET_FUNCS(device_sector_size, struct btrfs_dev_item, sector_size, 32);
1591 BTRFS_SETGET_FUNCS(device_id, struct btrfs_dev_item, devid, 64);
1592 BTRFS_SETGET_FUNCS(device_group, struct btrfs_dev_item, dev_group, 32);
1593 BTRFS_SETGET_FUNCS(device_seek_speed, struct btrfs_dev_item, seek_speed, 8);
1594 BTRFS_SETGET_FUNCS(device_bandwidth, struct btrfs_dev_item, bandwidth, 8);
1595 BTRFS_SETGET_FUNCS(device_generation, struct btrfs_dev_item, generation, 64);
1596
1597 BTRFS_SETGET_STACK_FUNCS(stack_device_type, struct btrfs_dev_item, type, 64);
1598 BTRFS_SETGET_STACK_FUNCS(stack_device_total_bytes, struct btrfs_dev_item,
1599                          total_bytes, 64);
1600 BTRFS_SETGET_STACK_FUNCS(stack_device_bytes_used, struct btrfs_dev_item,
1601                          bytes_used, 64);
1602 BTRFS_SETGET_STACK_FUNCS(stack_device_io_align, struct btrfs_dev_item,
1603                          io_align, 32);
1604 BTRFS_SETGET_STACK_FUNCS(stack_device_io_width, struct btrfs_dev_item,
1605                          io_width, 32);
1606 BTRFS_SETGET_STACK_FUNCS(stack_device_sector_size, struct btrfs_dev_item,
1607                          sector_size, 32);
1608 BTRFS_SETGET_STACK_FUNCS(stack_device_id, struct btrfs_dev_item, devid, 64);
1609 BTRFS_SETGET_STACK_FUNCS(stack_device_group, struct btrfs_dev_item,
1610                          dev_group, 32);
1611 BTRFS_SETGET_STACK_FUNCS(stack_device_seek_speed, struct btrfs_dev_item,
1612                          seek_speed, 8);
1613 BTRFS_SETGET_STACK_FUNCS(stack_device_bandwidth, struct btrfs_dev_item,
1614                          bandwidth, 8);
1615 BTRFS_SETGET_STACK_FUNCS(stack_device_generation, struct btrfs_dev_item,
1616                          generation, 64);
1617
1618 static inline unsigned long btrfs_device_uuid(struct btrfs_dev_item *d)
1619 {
1620         return (unsigned long)d + offsetof(struct btrfs_dev_item, uuid);
1621 }
1622
1623 static inline unsigned long btrfs_device_fsid(struct btrfs_dev_item *d)
1624 {
1625         return (unsigned long)d + offsetof(struct btrfs_dev_item, fsid);
1626 }
1627
1628 BTRFS_SETGET_FUNCS(chunk_length, struct btrfs_chunk, length, 64);
1629 BTRFS_SETGET_FUNCS(chunk_owner, struct btrfs_chunk, owner, 64);
1630 BTRFS_SETGET_FUNCS(chunk_stripe_len, struct btrfs_chunk, stripe_len, 64);
1631 BTRFS_SETGET_FUNCS(chunk_io_align, struct btrfs_chunk, io_align, 32);
1632 BTRFS_SETGET_FUNCS(chunk_io_width, struct btrfs_chunk, io_width, 32);
1633 BTRFS_SETGET_FUNCS(chunk_sector_size, struct btrfs_chunk, sector_size, 32);
1634 BTRFS_SETGET_FUNCS(chunk_type, struct btrfs_chunk, type, 64);
1635 BTRFS_SETGET_FUNCS(chunk_num_stripes, struct btrfs_chunk, num_stripes, 16);
1636 BTRFS_SETGET_FUNCS(chunk_sub_stripes, struct btrfs_chunk, sub_stripes, 16);
1637 BTRFS_SETGET_FUNCS(stripe_devid, struct btrfs_stripe, devid, 64);
1638 BTRFS_SETGET_FUNCS(stripe_offset, struct btrfs_stripe, offset, 64);
1639
1640 static inline char *btrfs_stripe_dev_uuid(struct btrfs_stripe *s)
1641 {
1642         return (char *)s + offsetof(struct btrfs_stripe, dev_uuid);
1643 }
1644
1645 BTRFS_SETGET_STACK_FUNCS(stack_chunk_length, struct btrfs_chunk, length, 64);
1646 BTRFS_SETGET_STACK_FUNCS(stack_chunk_owner, struct btrfs_chunk, owner, 64);
1647 BTRFS_SETGET_STACK_FUNCS(stack_chunk_stripe_len, struct btrfs_chunk,
1648                          stripe_len, 64);
1649 BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_align, struct btrfs_chunk,
1650                          io_align, 32);
1651 BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_width, struct btrfs_chunk,
1652                          io_width, 32);
1653 BTRFS_SETGET_STACK_FUNCS(stack_chunk_sector_size, struct btrfs_chunk,
1654                          sector_size, 32);
1655 BTRFS_SETGET_STACK_FUNCS(stack_chunk_type, struct btrfs_chunk, type, 64);
1656 BTRFS_SETGET_STACK_FUNCS(stack_chunk_num_stripes, struct btrfs_chunk,
1657                          num_stripes, 16);
1658 BTRFS_SETGET_STACK_FUNCS(stack_chunk_sub_stripes, struct btrfs_chunk,
1659                          sub_stripes, 16);
1660 BTRFS_SETGET_STACK_FUNCS(stack_stripe_devid, struct btrfs_stripe, devid, 64);
1661 BTRFS_SETGET_STACK_FUNCS(stack_stripe_offset, struct btrfs_stripe, offset, 64);
1662
1663 static inline struct btrfs_stripe *btrfs_stripe_nr(struct btrfs_chunk *c,
1664                                                    int nr)
1665 {
1666         unsigned long offset = (unsigned long)c;
1667         offset += offsetof(struct btrfs_chunk, stripe);
1668         offset += nr * sizeof(struct btrfs_stripe);
1669         return (struct btrfs_stripe *)offset;
1670 }
1671
1672 static inline char *btrfs_stripe_dev_uuid_nr(struct btrfs_chunk *c, int nr)
1673 {
1674         return btrfs_stripe_dev_uuid(btrfs_stripe_nr(c, nr));
1675 }
1676
1677 static inline u64 btrfs_stripe_offset_nr(struct extent_buffer *eb,
1678                                          struct btrfs_chunk *c, int nr)
1679 {
1680         return btrfs_stripe_offset(eb, btrfs_stripe_nr(c, nr));
1681 }
1682
1683 static inline u64 btrfs_stripe_devid_nr(struct extent_buffer *eb,
1684                                          struct btrfs_chunk *c, int nr)
1685 {
1686         return btrfs_stripe_devid(eb, btrfs_stripe_nr(c, nr));
1687 }
1688
1689 /* struct btrfs_block_group_item */
1690 BTRFS_SETGET_STACK_FUNCS(block_group_used, struct btrfs_block_group_item,
1691                          used, 64);
1692 BTRFS_SETGET_FUNCS(disk_block_group_used, struct btrfs_block_group_item,
1693                          used, 64);
1694 BTRFS_SETGET_STACK_FUNCS(block_group_chunk_objectid,
1695                         struct btrfs_block_group_item, chunk_objectid, 64);
1696
1697 BTRFS_SETGET_FUNCS(disk_block_group_chunk_objectid,
1698                    struct btrfs_block_group_item, chunk_objectid, 64);
1699 BTRFS_SETGET_FUNCS(disk_block_group_flags,
1700                    struct btrfs_block_group_item, flags, 64);
1701 BTRFS_SETGET_STACK_FUNCS(block_group_flags,
1702                         struct btrfs_block_group_item, flags, 64);
1703
1704 /* struct btrfs_free_space_info */
1705 BTRFS_SETGET_FUNCS(free_space_extent_count, struct btrfs_free_space_info,
1706                    extent_count, 32);
1707 BTRFS_SETGET_FUNCS(free_space_flags, struct btrfs_free_space_info, flags, 32);
1708
1709 /* struct btrfs_inode_ref */
1710 BTRFS_SETGET_FUNCS(inode_ref_name_len, struct btrfs_inode_ref, name_len, 16);
1711 BTRFS_SETGET_FUNCS(inode_ref_index, struct btrfs_inode_ref, index, 64);
1712
1713 /* struct btrfs_inode_extref */
1714 BTRFS_SETGET_FUNCS(inode_extref_parent, struct btrfs_inode_extref,
1715                    parent_objectid, 64);
1716 BTRFS_SETGET_FUNCS(inode_extref_name_len, struct btrfs_inode_extref,
1717                    name_len, 16);
1718 BTRFS_SETGET_FUNCS(inode_extref_index, struct btrfs_inode_extref, index, 64);
1719
1720 /* struct btrfs_inode_item */
1721 BTRFS_SETGET_FUNCS(inode_generation, struct btrfs_inode_item, generation, 64);
1722 BTRFS_SETGET_FUNCS(inode_sequence, struct btrfs_inode_item, sequence, 64);
1723 BTRFS_SETGET_FUNCS(inode_transid, struct btrfs_inode_item, transid, 64);
1724 BTRFS_SETGET_FUNCS(inode_size, struct btrfs_inode_item, size, 64);
1725 BTRFS_SETGET_FUNCS(inode_nbytes, struct btrfs_inode_item, nbytes, 64);
1726 BTRFS_SETGET_FUNCS(inode_block_group, struct btrfs_inode_item, block_group, 64);
1727 BTRFS_SETGET_FUNCS(inode_nlink, struct btrfs_inode_item, nlink, 32);
1728 BTRFS_SETGET_FUNCS(inode_uid, struct btrfs_inode_item, uid, 32);
1729 BTRFS_SETGET_FUNCS(inode_gid, struct btrfs_inode_item, gid, 32);
1730 BTRFS_SETGET_FUNCS(inode_mode, struct btrfs_inode_item, mode, 32);
1731 BTRFS_SETGET_FUNCS(inode_rdev, struct btrfs_inode_item, rdev, 64);
1732 BTRFS_SETGET_FUNCS(inode_flags, struct btrfs_inode_item, flags, 64);
1733 BTRFS_SETGET_STACK_FUNCS(stack_inode_generation, struct btrfs_inode_item,
1734                          generation, 64);
1735 BTRFS_SETGET_STACK_FUNCS(stack_inode_sequence, struct btrfs_inode_item,
1736                          sequence, 64);
1737 BTRFS_SETGET_STACK_FUNCS(stack_inode_transid, struct btrfs_inode_item,
1738                          transid, 64);
1739 BTRFS_SETGET_STACK_FUNCS(stack_inode_size, struct btrfs_inode_item, size, 64);
1740 BTRFS_SETGET_STACK_FUNCS(stack_inode_nbytes, struct btrfs_inode_item,
1741                          nbytes, 64);
1742 BTRFS_SETGET_STACK_FUNCS(stack_inode_block_group, struct btrfs_inode_item,
1743                          block_group, 64);
1744 BTRFS_SETGET_STACK_FUNCS(stack_inode_nlink, struct btrfs_inode_item, nlink, 32);
1745 BTRFS_SETGET_STACK_FUNCS(stack_inode_uid, struct btrfs_inode_item, uid, 32);
1746 BTRFS_SETGET_STACK_FUNCS(stack_inode_gid, struct btrfs_inode_item, gid, 32);
1747 BTRFS_SETGET_STACK_FUNCS(stack_inode_mode, struct btrfs_inode_item, mode, 32);
1748 BTRFS_SETGET_STACK_FUNCS(stack_inode_rdev, struct btrfs_inode_item, rdev, 64);
1749 BTRFS_SETGET_STACK_FUNCS(stack_inode_flags, struct btrfs_inode_item, flags, 64);
1750 BTRFS_SETGET_FUNCS(timespec_sec, struct btrfs_timespec, sec, 64);
1751 BTRFS_SETGET_FUNCS(timespec_nsec, struct btrfs_timespec, nsec, 32);
1752 BTRFS_SETGET_STACK_FUNCS(stack_timespec_sec, struct btrfs_timespec, sec, 64);
1753 BTRFS_SETGET_STACK_FUNCS(stack_timespec_nsec, struct btrfs_timespec, nsec, 32);
1754
1755 /* struct btrfs_dev_extent */
1756 BTRFS_SETGET_FUNCS(dev_extent_chunk_tree, struct btrfs_dev_extent,
1757                    chunk_tree, 64);
1758 BTRFS_SETGET_FUNCS(dev_extent_chunk_objectid, struct btrfs_dev_extent,
1759                    chunk_objectid, 64);
1760 BTRFS_SETGET_FUNCS(dev_extent_chunk_offset, struct btrfs_dev_extent,
1761                    chunk_offset, 64);
1762 BTRFS_SETGET_FUNCS(dev_extent_length, struct btrfs_dev_extent, length, 64);
1763
1764 static inline unsigned long btrfs_dev_extent_chunk_tree_uuid(struct btrfs_dev_extent *dev)
1765 {
1766         unsigned long ptr = offsetof(struct btrfs_dev_extent, chunk_tree_uuid);
1767         return (unsigned long)dev + ptr;
1768 }
1769
1770 BTRFS_SETGET_FUNCS(extent_refs, struct btrfs_extent_item, refs, 64);
1771 BTRFS_SETGET_FUNCS(extent_generation, struct btrfs_extent_item,
1772                    generation, 64);
1773 BTRFS_SETGET_FUNCS(extent_flags, struct btrfs_extent_item, flags, 64);
1774
1775 BTRFS_SETGET_FUNCS(extent_refs_v0, struct btrfs_extent_item_v0, refs, 32);
1776
1777
1778 BTRFS_SETGET_FUNCS(tree_block_level, struct btrfs_tree_block_info, level, 8);
1779
1780 static inline void btrfs_tree_block_key(struct extent_buffer *eb,
1781                                         struct btrfs_tree_block_info *item,
1782                                         struct btrfs_disk_key *key)
1783 {
1784         read_eb_member(eb, item, struct btrfs_tree_block_info, key, key);
1785 }
1786
1787 static inline void btrfs_set_tree_block_key(struct extent_buffer *eb,
1788                                             struct btrfs_tree_block_info *item,
1789                                             struct btrfs_disk_key *key)
1790 {
1791         write_eb_member(eb, item, struct btrfs_tree_block_info, key, key);
1792 }
1793
1794 BTRFS_SETGET_FUNCS(extent_data_ref_root, struct btrfs_extent_data_ref,
1795                    root, 64);
1796 BTRFS_SETGET_FUNCS(extent_data_ref_objectid, struct btrfs_extent_data_ref,
1797                    objectid, 64);
1798 BTRFS_SETGET_FUNCS(extent_data_ref_offset, struct btrfs_extent_data_ref,
1799                    offset, 64);
1800 BTRFS_SETGET_FUNCS(extent_data_ref_count, struct btrfs_extent_data_ref,
1801                    count, 32);
1802
1803 BTRFS_SETGET_FUNCS(shared_data_ref_count, struct btrfs_shared_data_ref,
1804                    count, 32);
1805
1806 BTRFS_SETGET_FUNCS(extent_inline_ref_type, struct btrfs_extent_inline_ref,
1807                    type, 8);
1808 BTRFS_SETGET_FUNCS(extent_inline_ref_offset, struct btrfs_extent_inline_ref,
1809                    offset, 64);
1810
1811 static inline u32 btrfs_extent_inline_ref_size(int type)
1812 {
1813         if (type == BTRFS_TREE_BLOCK_REF_KEY ||
1814             type == BTRFS_SHARED_BLOCK_REF_KEY)
1815                 return sizeof(struct btrfs_extent_inline_ref);
1816         if (type == BTRFS_SHARED_DATA_REF_KEY)
1817                 return sizeof(struct btrfs_shared_data_ref) +
1818                        sizeof(struct btrfs_extent_inline_ref);
1819         if (type == BTRFS_EXTENT_DATA_REF_KEY)
1820                 return sizeof(struct btrfs_extent_data_ref) +
1821                        offsetof(struct btrfs_extent_inline_ref, offset);
1822         return 0;
1823 }
1824
1825 BTRFS_SETGET_FUNCS(ref_root_v0, struct btrfs_extent_ref_v0, root, 64);
1826 BTRFS_SETGET_FUNCS(ref_generation_v0, struct btrfs_extent_ref_v0,
1827                    generation, 64);
1828 BTRFS_SETGET_FUNCS(ref_objectid_v0, struct btrfs_extent_ref_v0, objectid, 64);
1829 BTRFS_SETGET_FUNCS(ref_count_v0, struct btrfs_extent_ref_v0, count, 32);
1830
1831 /* struct btrfs_node */
1832 BTRFS_SETGET_FUNCS(key_blockptr, struct btrfs_key_ptr, blockptr, 64);
1833 BTRFS_SETGET_FUNCS(key_generation, struct btrfs_key_ptr, generation, 64);
1834 BTRFS_SETGET_STACK_FUNCS(stack_key_blockptr, struct btrfs_key_ptr,
1835                          blockptr, 64);
1836 BTRFS_SETGET_STACK_FUNCS(stack_key_generation, struct btrfs_key_ptr,
1837                          generation, 64);
1838
1839 static inline u64 btrfs_node_blockptr(struct extent_buffer *eb, int nr)
1840 {
1841         unsigned long ptr;
1842         ptr = offsetof(struct btrfs_node, ptrs) +
1843                 sizeof(struct btrfs_key_ptr) * nr;
1844         return btrfs_key_blockptr(eb, (struct btrfs_key_ptr *)ptr);
1845 }
1846
1847 static inline void btrfs_set_node_blockptr(struct extent_buffer *eb,
1848                                            int nr, u64 val)
1849 {
1850         unsigned long ptr;
1851         ptr = offsetof(struct btrfs_node, ptrs) +
1852                 sizeof(struct btrfs_key_ptr) * nr;
1853         btrfs_set_key_blockptr(eb, (struct btrfs_key_ptr *)ptr, val);
1854 }
1855
1856 static inline u64 btrfs_node_ptr_generation(struct extent_buffer *eb, int nr)
1857 {
1858         unsigned long ptr;
1859         ptr = offsetof(struct btrfs_node, ptrs) +
1860                 sizeof(struct btrfs_key_ptr) * nr;
1861         return btrfs_key_generation(eb, (struct btrfs_key_ptr *)ptr);
1862 }
1863
1864 static inline void btrfs_set_node_ptr_generation(struct extent_buffer *eb,
1865                                                  int nr, u64 val)
1866 {
1867         unsigned long ptr;
1868         ptr = offsetof(struct btrfs_node, ptrs) +
1869                 sizeof(struct btrfs_key_ptr) * nr;
1870         btrfs_set_key_generation(eb, (struct btrfs_key_ptr *)ptr, val);
1871 }
1872
1873 static inline unsigned long btrfs_node_key_ptr_offset(int nr)
1874 {
1875         return offsetof(struct btrfs_node, ptrs) +
1876                 sizeof(struct btrfs_key_ptr) * nr;
1877 }
1878
1879 void btrfs_node_key(const struct extent_buffer *eb,
1880                     struct btrfs_disk_key *disk_key, int nr);
1881
1882 static inline void btrfs_set_node_key(struct extent_buffer *eb,
1883                                       struct btrfs_disk_key *disk_key, int nr)
1884 {
1885         unsigned long ptr;
1886         ptr = btrfs_node_key_ptr_offset(nr);
1887         write_eb_member(eb, (struct btrfs_key_ptr *)ptr,
1888                        struct btrfs_key_ptr, key, disk_key);
1889 }
1890
1891 /* struct btrfs_item */
1892 BTRFS_SETGET_FUNCS(item_offset, struct btrfs_item, offset, 32);
1893 BTRFS_SETGET_FUNCS(item_size, struct btrfs_item, size, 32);
1894 BTRFS_SETGET_STACK_FUNCS(stack_item_offset, struct btrfs_item, offset, 32);
1895 BTRFS_SETGET_STACK_FUNCS(stack_item_size, struct btrfs_item, size, 32);
1896
1897 static inline unsigned long btrfs_item_nr_offset(int nr)
1898 {
1899         return offsetof(struct btrfs_leaf, items) +
1900                 sizeof(struct btrfs_item) * nr;
1901 }
1902
1903 static inline struct btrfs_item *btrfs_item_nr(int nr)
1904 {
1905         return (struct btrfs_item *)btrfs_item_nr_offset(nr);
1906 }
1907
1908 static inline u32 btrfs_item_end(const struct extent_buffer *eb,
1909                                  struct btrfs_item *item)
1910 {
1911         return btrfs_item_offset(eb, item) + btrfs_item_size(eb, item);
1912 }
1913
1914 static inline u32 btrfs_item_end_nr(const struct extent_buffer *eb, int nr)
1915 {
1916         return btrfs_item_end(eb, btrfs_item_nr(nr));
1917 }
1918
1919 static inline u32 btrfs_item_offset_nr(const struct extent_buffer *eb, int nr)
1920 {
1921         return btrfs_item_offset(eb, btrfs_item_nr(nr));
1922 }
1923
1924 static inline u32 btrfs_item_size_nr(const struct extent_buffer *eb, int nr)
1925 {
1926         return btrfs_item_size(eb, btrfs_item_nr(nr));
1927 }
1928
1929 static inline void btrfs_item_key(const struct extent_buffer *eb,
1930                            struct btrfs_disk_key *disk_key, int nr)
1931 {
1932         struct btrfs_item *item = btrfs_item_nr(nr);
1933         read_eb_member(eb, item, struct btrfs_item, key, disk_key);
1934 }
1935
1936 static inline void btrfs_set_item_key(struct extent_buffer *eb,
1937                                struct btrfs_disk_key *disk_key, int nr)
1938 {
1939         struct btrfs_item *item = btrfs_item_nr(nr);
1940         write_eb_member(eb, item, struct btrfs_item, key, disk_key);
1941 }
1942
1943 BTRFS_SETGET_FUNCS(dir_log_end, struct btrfs_dir_log_item, end, 64);
1944
1945 /*
1946  * struct btrfs_root_ref
1947  */
1948 BTRFS_SETGET_FUNCS(root_ref_dirid, struct btrfs_root_ref, dirid, 64);
1949 BTRFS_SETGET_FUNCS(root_ref_sequence, struct btrfs_root_ref, sequence, 64);
1950 BTRFS_SETGET_FUNCS(root_ref_name_len, struct btrfs_root_ref, name_len, 16);
1951
1952 /* struct btrfs_dir_item */
1953 BTRFS_SETGET_FUNCS(dir_data_len, struct btrfs_dir_item, data_len, 16);
1954 BTRFS_SETGET_FUNCS(dir_type, struct btrfs_dir_item, type, 8);
1955 BTRFS_SETGET_FUNCS(dir_name_len, struct btrfs_dir_item, name_len, 16);
1956 BTRFS_SETGET_FUNCS(dir_transid, struct btrfs_dir_item, transid, 64);
1957 BTRFS_SETGET_STACK_FUNCS(stack_dir_type, struct btrfs_dir_item, type, 8);
1958 BTRFS_SETGET_STACK_FUNCS(stack_dir_data_len, struct btrfs_dir_item,
1959                          data_len, 16);
1960 BTRFS_SETGET_STACK_FUNCS(stack_dir_name_len, struct btrfs_dir_item,
1961                          name_len, 16);
1962 BTRFS_SETGET_STACK_FUNCS(stack_dir_transid, struct btrfs_dir_item,
1963                          transid, 64);
1964
1965 static inline void btrfs_dir_item_key(const struct extent_buffer *eb,
1966                                       const struct btrfs_dir_item *item,
1967                                       struct btrfs_disk_key *key)
1968 {
1969         read_eb_member(eb, item, struct btrfs_dir_item, location, key);
1970 }
1971
1972 static inline void btrfs_set_dir_item_key(struct extent_buffer *eb,
1973                                           struct btrfs_dir_item *item,
1974                                           const struct btrfs_disk_key *key)
1975 {
1976         write_eb_member(eb, item, struct btrfs_dir_item, location, key);
1977 }
1978
1979 BTRFS_SETGET_FUNCS(free_space_entries, struct btrfs_free_space_header,
1980                    num_entries, 64);
1981 BTRFS_SETGET_FUNCS(free_space_bitmaps, struct btrfs_free_space_header,
1982                    num_bitmaps, 64);
1983 BTRFS_SETGET_FUNCS(free_space_generation, struct btrfs_free_space_header,
1984                    generation, 64);
1985
1986 static inline void btrfs_free_space_key(const struct extent_buffer *eb,
1987                                         const struct btrfs_free_space_header *h,
1988                                         struct btrfs_disk_key *key)
1989 {
1990         read_eb_member(eb, h, struct btrfs_free_space_header, location, key);
1991 }
1992
1993 static inline void btrfs_set_free_space_key(struct extent_buffer *eb,
1994                                             struct btrfs_free_space_header *h,
1995                                             const struct btrfs_disk_key *key)
1996 {
1997         write_eb_member(eb, h, struct btrfs_free_space_header, location, key);
1998 }
1999
2000 /* struct btrfs_disk_key */
2001 BTRFS_SETGET_STACK_FUNCS(disk_key_objectid, struct btrfs_disk_key,
2002                          objectid, 64);
2003 BTRFS_SETGET_STACK_FUNCS(disk_key_offset, struct btrfs_disk_key, offset, 64);
2004 BTRFS_SETGET_STACK_FUNCS(disk_key_type, struct btrfs_disk_key, type, 8);
2005
2006 static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu,
2007                                          const struct btrfs_disk_key *disk)
2008 {
2009         cpu->offset = le64_to_cpu(disk->offset);
2010         cpu->type = disk->type;
2011         cpu->objectid = le64_to_cpu(disk->objectid);
2012 }
2013
2014 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk,
2015                                          const struct btrfs_key *cpu)
2016 {
2017         disk->offset = cpu_to_le64(cpu->offset);
2018         disk->type = cpu->type;
2019         disk->objectid = cpu_to_le64(cpu->objectid);
2020 }
2021
2022 static inline void btrfs_node_key_to_cpu(const struct extent_buffer *eb,
2023                                          struct btrfs_key *key, int nr)
2024 {
2025         struct btrfs_disk_key disk_key;
2026         btrfs_node_key(eb, &disk_key, nr);
2027         btrfs_disk_key_to_cpu(key, &disk_key);
2028 }
2029
2030 static inline void btrfs_item_key_to_cpu(const struct extent_buffer *eb,
2031                                          struct btrfs_key *key, int nr)
2032 {
2033         struct btrfs_disk_key disk_key;
2034         btrfs_item_key(eb, &disk_key, nr);
2035         btrfs_disk_key_to_cpu(key, &disk_key);
2036 }
2037
2038 static inline void btrfs_dir_item_key_to_cpu(const struct extent_buffer *eb,
2039                                              const struct btrfs_dir_item *item,
2040                                              struct btrfs_key *key)
2041 {
2042         struct btrfs_disk_key disk_key;
2043         btrfs_dir_item_key(eb, item, &disk_key);
2044         btrfs_disk_key_to_cpu(key, &disk_key);
2045 }
2046
2047 static inline u8 btrfs_key_type(const struct btrfs_key *key)
2048 {
2049         return key->type;
2050 }
2051
2052 static inline void btrfs_set_key_type(struct btrfs_key *key, u8 val)
2053 {
2054         key->type = val;
2055 }
2056
2057 /* struct btrfs_header */
2058 BTRFS_SETGET_HEADER_FUNCS(header_bytenr, struct btrfs_header, bytenr, 64);
2059 BTRFS_SETGET_HEADER_FUNCS(header_generation, struct btrfs_header,
2060                           generation, 64);
2061 BTRFS_SETGET_HEADER_FUNCS(header_owner, struct btrfs_header, owner, 64);
2062 BTRFS_SETGET_HEADER_FUNCS(header_nritems, struct btrfs_header, nritems, 32);
2063 BTRFS_SETGET_HEADER_FUNCS(header_flags, struct btrfs_header, flags, 64);
2064 BTRFS_SETGET_HEADER_FUNCS(header_level, struct btrfs_header, level, 8);
2065 BTRFS_SETGET_STACK_FUNCS(stack_header_generation, struct btrfs_header,
2066                          generation, 64);
2067 BTRFS_SETGET_STACK_FUNCS(stack_header_owner, struct btrfs_header, owner, 64);
2068 BTRFS_SETGET_STACK_FUNCS(stack_header_nritems, struct btrfs_header,
2069                          nritems, 32);
2070 BTRFS_SETGET_STACK_FUNCS(stack_header_bytenr, struct btrfs_header, bytenr, 64);
2071
2072 static inline int btrfs_header_flag(const struct extent_buffer *eb, u64 flag)
2073 {
2074         return (btrfs_header_flags(eb) & flag) == flag;
2075 }
2076
2077 static inline int btrfs_set_header_flag(struct extent_buffer *eb, u64 flag)
2078 {
2079         u64 flags = btrfs_header_flags(eb);
2080         btrfs_set_header_flags(eb, flags | flag);
2081         return (flags & flag) == flag;
2082 }
2083
2084 static inline int btrfs_clear_header_flag(struct extent_buffer *eb, u64 flag)
2085 {
2086         u64 flags = btrfs_header_flags(eb);
2087         btrfs_set_header_flags(eb, flags & ~flag);
2088         return (flags & flag) == flag;
2089 }
2090
2091 static inline int btrfs_header_backref_rev(const struct extent_buffer *eb)
2092 {
2093         u64 flags = btrfs_header_flags(eb);
2094         return flags >> BTRFS_BACKREF_REV_SHIFT;
2095 }
2096
2097 static inline void btrfs_set_header_backref_rev(struct extent_buffer *eb,
2098                                                 int rev)
2099 {
2100         u64 flags = btrfs_header_flags(eb);
2101         flags &= ~BTRFS_BACKREF_REV_MASK;
2102         flags |= (u64)rev << BTRFS_BACKREF_REV_SHIFT;
2103         btrfs_set_header_flags(eb, flags);
2104 }
2105
2106 static inline unsigned long btrfs_header_fsid(void)
2107 {
2108         return offsetof(struct btrfs_header, fsid);
2109 }
2110
2111 static inline unsigned long btrfs_header_chunk_tree_uuid(const struct extent_buffer *eb)
2112 {
2113         return offsetof(struct btrfs_header, chunk_tree_uuid);
2114 }
2115
2116 static inline int btrfs_is_leaf(const struct extent_buffer *eb)
2117 {
2118         return btrfs_header_level(eb) == 0;
2119 }
2120
2121 /* struct btrfs_root_item */
2122 BTRFS_SETGET_FUNCS(disk_root_generation, struct btrfs_root_item,
2123                    generation, 64);
2124 BTRFS_SETGET_FUNCS(disk_root_refs, struct btrfs_root_item, refs, 32);
2125 BTRFS_SETGET_FUNCS(disk_root_bytenr, struct btrfs_root_item, bytenr, 64);
2126 BTRFS_SETGET_FUNCS(disk_root_level, struct btrfs_root_item, level, 8);
2127
2128 BTRFS_SETGET_STACK_FUNCS(root_generation, struct btrfs_root_item,
2129                          generation, 64);
2130 BTRFS_SETGET_STACK_FUNCS(root_bytenr, struct btrfs_root_item, bytenr, 64);
2131 BTRFS_SETGET_STACK_FUNCS(root_level, struct btrfs_root_item, level, 8);
2132 BTRFS_SETGET_STACK_FUNCS(root_dirid, struct btrfs_root_item, root_dirid, 64);
2133 BTRFS_SETGET_STACK_FUNCS(root_refs, struct btrfs_root_item, refs, 32);
2134 BTRFS_SETGET_STACK_FUNCS(root_flags, struct btrfs_root_item, flags, 64);
2135 BTRFS_SETGET_STACK_FUNCS(root_used, struct btrfs_root_item, bytes_used, 64);
2136 BTRFS_SETGET_STACK_FUNCS(root_limit, struct btrfs_root_item, byte_limit, 64);
2137 BTRFS_SETGET_STACK_FUNCS(root_last_snapshot, struct btrfs_root_item,
2138                          last_snapshot, 64);
2139 BTRFS_SETGET_STACK_FUNCS(root_generation_v2, struct btrfs_root_item,
2140                          generation_v2, 64);
2141 BTRFS_SETGET_STACK_FUNCS(root_ctransid, struct btrfs_root_item,
2142                          ctransid, 64);
2143 BTRFS_SETGET_STACK_FUNCS(root_otransid, struct btrfs_root_item,
2144                          otransid, 64);
2145 BTRFS_SETGET_STACK_FUNCS(root_stransid, struct btrfs_root_item,
2146                          stransid, 64);
2147 BTRFS_SETGET_STACK_FUNCS(root_rtransid, struct btrfs_root_item,
2148                          rtransid, 64);
2149
2150 static inline bool btrfs_root_readonly(const struct btrfs_root *root)
2151 {
2152         return (root->root_item.flags & cpu_to_le64(BTRFS_ROOT_SUBVOL_RDONLY)) != 0;
2153 }
2154
2155 static inline bool btrfs_root_dead(const struct btrfs_root *root)
2156 {
2157         return (root->root_item.flags & cpu_to_le64(BTRFS_ROOT_SUBVOL_DEAD)) != 0;
2158 }
2159
2160 /* struct btrfs_root_backup */
2161 BTRFS_SETGET_STACK_FUNCS(backup_tree_root, struct btrfs_root_backup,
2162                    tree_root, 64);
2163 BTRFS_SETGET_STACK_FUNCS(backup_tree_root_gen, struct btrfs_root_backup,
2164                    tree_root_gen, 64);
2165 BTRFS_SETGET_STACK_FUNCS(backup_tree_root_level, struct btrfs_root_backup,
2166                    tree_root_level, 8);
2167
2168 BTRFS_SETGET_STACK_FUNCS(backup_chunk_root, struct btrfs_root_backup,
2169                    chunk_root, 64);
2170 BTRFS_SETGET_STACK_FUNCS(backup_chunk_root_gen, struct btrfs_root_backup,
2171                    chunk_root_gen, 64);
2172 BTRFS_SETGET_STACK_FUNCS(backup_chunk_root_level, struct btrfs_root_backup,
2173                    chunk_root_level, 8);
2174
2175 BTRFS_SETGET_STACK_FUNCS(backup_extent_root, struct btrfs_root_backup,
2176                    extent_root, 64);
2177 BTRFS_SETGET_STACK_FUNCS(backup_extent_root_gen, struct btrfs_root_backup,
2178                    extent_root_gen, 64);
2179 BTRFS_SETGET_STACK_FUNCS(backup_extent_root_level, struct btrfs_root_backup,
2180                    extent_root_level, 8);
2181
2182 BTRFS_SETGET_STACK_FUNCS(backup_fs_root, struct btrfs_root_backup,
2183                    fs_root, 64);
2184 BTRFS_SETGET_STACK_FUNCS(backup_fs_root_gen, struct btrfs_root_backup,
2185                    fs_root_gen, 64);
2186 BTRFS_SETGET_STACK_FUNCS(backup_fs_root_level, struct btrfs_root_backup,
2187                    fs_root_level, 8);
2188
2189 BTRFS_SETGET_STACK_FUNCS(backup_dev_root, struct btrfs_root_backup,
2190                    dev_root, 64);
2191 BTRFS_SETGET_STACK_FUNCS(backup_dev_root_gen, struct btrfs_root_backup,
2192                    dev_root_gen, 64);
2193 BTRFS_SETGET_STACK_FUNCS(backup_dev_root_level, struct btrfs_root_backup,
2194                    dev_root_level, 8);
2195
2196 BTRFS_SETGET_STACK_FUNCS(backup_csum_root, struct btrfs_root_backup,
2197                    csum_root, 64);
2198 BTRFS_SETGET_STACK_FUNCS(backup_csum_root_gen, struct btrfs_root_backup,
2199                    csum_root_gen, 64);
2200 BTRFS_SETGET_STACK_FUNCS(backup_csum_root_level, struct btrfs_root_backup,
2201                    csum_root_level, 8);
2202 BTRFS_SETGET_STACK_FUNCS(backup_total_bytes, struct btrfs_root_backup,
2203                    total_bytes, 64);
2204 BTRFS_SETGET_STACK_FUNCS(backup_bytes_used, struct btrfs_root_backup,
2205                    bytes_used, 64);
2206 BTRFS_SETGET_STACK_FUNCS(backup_num_devices, struct btrfs_root_backup,
2207                    num_devices, 64);
2208
2209 /* struct btrfs_balance_item */
2210 BTRFS_SETGET_FUNCS(balance_flags, struct btrfs_balance_item, flags, 64);
2211
2212 static inline void btrfs_balance_data(const struct extent_buffer *eb,
2213                                       const struct btrfs_balance_item *bi,
2214                                       struct btrfs_disk_balance_args *ba)
2215 {
2216         read_eb_member(eb, bi, struct btrfs_balance_item, data, ba);
2217 }
2218
2219 static inline void btrfs_set_balance_data(struct extent_buffer *eb,
2220                                   struct btrfs_balance_item *bi,
2221                                   const struct btrfs_disk_balance_args *ba)
2222 {
2223         write_eb_member(eb, bi, struct btrfs_balance_item, data, ba);
2224 }
2225
2226 static inline void btrfs_balance_meta(const struct extent_buffer *eb,
2227                                       const struct btrfs_balance_item *bi,
2228                                       struct btrfs_disk_balance_args *ba)
2229 {
2230         read_eb_member(eb, bi, struct btrfs_balance_item, meta, ba);
2231 }
2232
2233 static inline void btrfs_set_balance_meta(struct extent_buffer *eb,
2234                                   struct btrfs_balance_item *bi,
2235                                   const struct btrfs_disk_balance_args *ba)
2236 {
2237         write_eb_member(eb, bi, struct btrfs_balance_item, meta, ba);
2238 }
2239
2240 static inline void btrfs_balance_sys(const struct extent_buffer *eb,
2241                                      const struct btrfs_balance_item *bi,
2242                                      struct btrfs_disk_balance_args *ba)
2243 {
2244         read_eb_member(eb, bi, struct btrfs_balance_item, sys, ba);
2245 }
2246
2247 static inline void btrfs_set_balance_sys(struct extent_buffer *eb,
2248                                  struct btrfs_balance_item *bi,
2249                                  const struct btrfs_disk_balance_args *ba)
2250 {
2251         write_eb_member(eb, bi, struct btrfs_balance_item, sys, ba);
2252 }
2253
2254 static inline void
2255 btrfs_disk_balance_args_to_cpu(struct btrfs_balance_args *cpu,
2256                                const struct btrfs_disk_balance_args *disk)
2257 {
2258         memset(cpu, 0, sizeof(*cpu));
2259
2260         cpu->profiles = le64_to_cpu(disk->profiles);
2261         cpu->usage = le64_to_cpu(disk->usage);
2262         cpu->devid = le64_to_cpu(disk->devid);
2263         cpu->pstart = le64_to_cpu(disk->pstart);
2264         cpu->pend = le64_to_cpu(disk->pend);
2265         cpu->vstart = le64_to_cpu(disk->vstart);
2266         cpu->vend = le64_to_cpu(disk->vend);
2267         cpu->target = le64_to_cpu(disk->target);
2268         cpu->flags = le64_to_cpu(disk->flags);
2269         cpu->limit = le64_to_cpu(disk->limit);
2270         cpu->stripes_min = le32_to_cpu(disk->stripes_min);
2271         cpu->stripes_max = le32_to_cpu(disk->stripes_max);
2272 }
2273
2274 static inline void
2275 btrfs_cpu_balance_args_to_disk(struct btrfs_disk_balance_args *disk,
2276                                const struct btrfs_balance_args *cpu)
2277 {
2278         memset(disk, 0, sizeof(*disk));
2279
2280         disk->profiles = cpu_to_le64(cpu->profiles);
2281         disk->usage = cpu_to_le64(cpu->usage);
2282         disk->devid = cpu_to_le64(cpu->devid);
2283         disk->pstart = cpu_to_le64(cpu->pstart);
2284         disk->pend = cpu_to_le64(cpu->pend);
2285         disk->vstart = cpu_to_le64(cpu->vstart);
2286         disk->vend = cpu_to_le64(cpu->vend);
2287         disk->target = cpu_to_le64(cpu->target);
2288         disk->flags = cpu_to_le64(cpu->flags);
2289         disk->limit = cpu_to_le64(cpu->limit);
2290         disk->stripes_min = cpu_to_le32(cpu->stripes_min);
2291         disk->stripes_max = cpu_to_le32(cpu->stripes_max);
2292 }
2293
2294 /* struct btrfs_super_block */
2295 BTRFS_SETGET_STACK_FUNCS(super_bytenr, struct btrfs_super_block, bytenr, 64);
2296 BTRFS_SETGET_STACK_FUNCS(super_flags, struct btrfs_super_block, flags, 64);
2297 BTRFS_SETGET_STACK_FUNCS(super_generation, struct btrfs_super_block,
2298                          generation, 64);
2299 BTRFS_SETGET_STACK_FUNCS(super_root, struct btrfs_super_block, root, 64);
2300 BTRFS_SETGET_STACK_FUNCS(super_sys_array_size,
2301                          struct btrfs_super_block, sys_chunk_array_size, 32);
2302 BTRFS_SETGET_STACK_FUNCS(super_chunk_root_generation,
2303                          struct btrfs_super_block, chunk_root_generation, 64);
2304 BTRFS_SETGET_STACK_FUNCS(super_root_level, struct btrfs_super_block,
2305                          root_level, 8);
2306 BTRFS_SETGET_STACK_FUNCS(super_chunk_root, struct btrfs_super_block,
2307                          chunk_root, 64);
2308 BTRFS_SETGET_STACK_FUNCS(super_chunk_root_level, struct btrfs_super_block,
2309                          chunk_root_level, 8);
2310 BTRFS_SETGET_STACK_FUNCS(super_log_root, struct btrfs_super_block,
2311                          log_root, 64);
2312 BTRFS_SETGET_STACK_FUNCS(super_log_root_transid, struct btrfs_super_block,
2313                          log_root_transid, 64);
2314 BTRFS_SETGET_STACK_FUNCS(super_log_root_level, struct btrfs_super_block,
2315                          log_root_level, 8);
2316 BTRFS_SETGET_STACK_FUNCS(super_total_bytes, struct btrfs_super_block,
2317                          total_bytes, 64);
2318 BTRFS_SETGET_STACK_FUNCS(super_bytes_used, struct btrfs_super_block,
2319                          bytes_used, 64);
2320 BTRFS_SETGET_STACK_FUNCS(super_sectorsize, struct btrfs_super_block,
2321                          sectorsize, 32);
2322 BTRFS_SETGET_STACK_FUNCS(super_nodesize, struct btrfs_super_block,
2323                          nodesize, 32);
2324 BTRFS_SETGET_STACK_FUNCS(super_stripesize, struct btrfs_super_block,
2325                          stripesize, 32);
2326 BTRFS_SETGET_STACK_FUNCS(super_root_dir, struct btrfs_super_block,
2327                          root_dir_objectid, 64);
2328 BTRFS_SETGET_STACK_FUNCS(super_num_devices, struct btrfs_super_block,
2329                          num_devices, 64);
2330 BTRFS_SETGET_STACK_FUNCS(super_compat_flags, struct btrfs_super_block,
2331                          compat_flags, 64);
2332 BTRFS_SETGET_STACK_FUNCS(super_compat_ro_flags, struct btrfs_super_block,
2333                          compat_ro_flags, 64);
2334 BTRFS_SETGET_STACK_FUNCS(super_incompat_flags, struct btrfs_super_block,
2335                          incompat_flags, 64);
2336 BTRFS_SETGET_STACK_FUNCS(super_csum_type, struct btrfs_super_block,
2337                          csum_type, 16);
2338 BTRFS_SETGET_STACK_FUNCS(super_cache_generation, struct btrfs_super_block,
2339                          cache_generation, 64);
2340 BTRFS_SETGET_STACK_FUNCS(super_magic, struct btrfs_super_block, magic, 64);
2341 BTRFS_SETGET_STACK_FUNCS(super_uuid_tree_generation, struct btrfs_super_block,
2342                          uuid_tree_generation, 64);
2343
2344 static inline int btrfs_super_csum_size(const struct btrfs_super_block *s)
2345 {
2346         u16 t = btrfs_super_csum_type(s);
2347         /*
2348          * csum type is validated at mount time
2349          */
2350         return btrfs_csum_sizes[t];
2351 }
2352
2353
2354 /*
2355  * The leaf data grows from end-to-front in the node.
2356  * this returns the address of the start of the last item,
2357  * which is the stop of the leaf data stack
2358  */
2359 static inline unsigned int leaf_data_end(const struct btrfs_fs_info *fs_info,
2360                                          const struct extent_buffer *leaf)
2361 {
2362         u32 nr = btrfs_header_nritems(leaf);
2363
2364         if (nr == 0)
2365                 return BTRFS_LEAF_DATA_SIZE(fs_info);
2366         return btrfs_item_offset_nr(leaf, nr - 1);
2367 }
2368
2369 /* struct btrfs_file_extent_item */
2370 BTRFS_SETGET_FUNCS(file_extent_type, struct btrfs_file_extent_item, type, 8);
2371 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_disk_bytenr,
2372                          struct btrfs_file_extent_item, disk_bytenr, 64);
2373 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_offset,
2374                          struct btrfs_file_extent_item, offset, 64);
2375 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_generation,
2376                          struct btrfs_file_extent_item, generation, 64);
2377 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_num_bytes,
2378                          struct btrfs_file_extent_item, num_bytes, 64);
2379 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_disk_num_bytes,
2380                          struct btrfs_file_extent_item, disk_num_bytes, 64);
2381 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_compression,
2382                          struct btrfs_file_extent_item, compression, 8);
2383
2384 static inline unsigned long
2385 btrfs_file_extent_inline_start(const struct btrfs_file_extent_item *e)
2386 {
2387         return (unsigned long)e + BTRFS_FILE_EXTENT_INLINE_DATA_START;
2388 }
2389
2390 static inline u32 btrfs_file_extent_calc_inline_size(u32 datasize)
2391 {
2392         return BTRFS_FILE_EXTENT_INLINE_DATA_START + datasize;
2393 }
2394
2395 BTRFS_SETGET_FUNCS(file_extent_disk_bytenr, struct btrfs_file_extent_item,
2396                    disk_bytenr, 64);
2397 BTRFS_SETGET_FUNCS(file_extent_generation, struct btrfs_file_extent_item,
2398                    generation, 64);
2399 BTRFS_SETGET_FUNCS(file_extent_disk_num_bytes, struct btrfs_file_extent_item,
2400                    disk_num_bytes, 64);
2401 BTRFS_SETGET_FUNCS(file_extent_offset, struct btrfs_file_extent_item,
2402                   offset, 64);
2403 BTRFS_SETGET_FUNCS(file_extent_num_bytes, struct btrfs_file_extent_item,
2404                    num_bytes, 64);
2405 BTRFS_SETGET_FUNCS(file_extent_ram_bytes, struct btrfs_file_extent_item,
2406                    ram_bytes, 64);
2407 BTRFS_SETGET_FUNCS(file_extent_compression, struct btrfs_file_extent_item,
2408                    compression, 8);
2409 BTRFS_SETGET_FUNCS(file_extent_encryption, struct btrfs_file_extent_item,
2410                    encryption, 8);
2411 BTRFS_SETGET_FUNCS(file_extent_other_encoding, struct btrfs_file_extent_item,
2412                    other_encoding, 16);
2413
2414 /*
2415  * this returns the number of bytes used by the item on disk, minus the
2416  * size of any extent headers.  If a file is compressed on disk, this is
2417  * the compressed size
2418  */
2419 static inline u32 btrfs_file_extent_inline_item_len(
2420                                                 const struct extent_buffer *eb,
2421                                                 struct btrfs_item *e)
2422 {
2423         return btrfs_item_size(eb, e) - BTRFS_FILE_EXTENT_INLINE_DATA_START;
2424 }
2425
2426 /* btrfs_dev_stats_item */
2427 static inline u64 btrfs_dev_stats_value(const struct extent_buffer *eb,
2428                                         const struct btrfs_dev_stats_item *ptr,
2429                                         int index)
2430 {
2431         u64 val;
2432
2433         read_extent_buffer(eb, &val,
2434                            offsetof(struct btrfs_dev_stats_item, values) +
2435                             ((unsigned long)ptr) + (index * sizeof(u64)),
2436                            sizeof(val));
2437         return val;
2438 }
2439
2440 static inline void btrfs_set_dev_stats_value(struct extent_buffer *eb,
2441                                              struct btrfs_dev_stats_item *ptr,
2442                                              int index, u64 val)
2443 {
2444         write_extent_buffer(eb, &val,
2445                             offsetof(struct btrfs_dev_stats_item, values) +
2446                              ((unsigned long)ptr) + (index * sizeof(u64)),
2447                             sizeof(val));
2448 }
2449
2450 /* btrfs_qgroup_status_item */
2451 BTRFS_SETGET_FUNCS(qgroup_status_generation, struct btrfs_qgroup_status_item,
2452                    generation, 64);
2453 BTRFS_SETGET_FUNCS(qgroup_status_version, struct btrfs_qgroup_status_item,
2454                    version, 64);
2455 BTRFS_SETGET_FUNCS(qgroup_status_flags, struct btrfs_qgroup_status_item,
2456                    flags, 64);
2457 BTRFS_SETGET_FUNCS(qgroup_status_rescan, struct btrfs_qgroup_status_item,
2458                    rescan, 64);
2459
2460 /* btrfs_qgroup_info_item */
2461 BTRFS_SETGET_FUNCS(qgroup_info_generation, struct btrfs_qgroup_info_item,
2462                    generation, 64);
2463 BTRFS_SETGET_FUNCS(qgroup_info_rfer, struct btrfs_qgroup_info_item, rfer, 64);
2464 BTRFS_SETGET_FUNCS(qgroup_info_rfer_cmpr, struct btrfs_qgroup_info_item,
2465                    rfer_cmpr, 64);
2466 BTRFS_SETGET_FUNCS(qgroup_info_excl, struct btrfs_qgroup_info_item, excl, 64);
2467 BTRFS_SETGET_FUNCS(qgroup_info_excl_cmpr, struct btrfs_qgroup_info_item,
2468                    excl_cmpr, 64);
2469
2470 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_generation,
2471                          struct btrfs_qgroup_info_item, generation, 64);
2472 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_rfer, struct btrfs_qgroup_info_item,
2473                          rfer, 64);
2474 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_rfer_cmpr,
2475                          struct btrfs_qgroup_info_item, rfer_cmpr, 64);
2476 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_excl, struct btrfs_qgroup_info_item,
2477                          excl, 64);
2478 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_excl_cmpr,
2479                          struct btrfs_qgroup_info_item, excl_cmpr, 64);
2480
2481 /* btrfs_qgroup_limit_item */
2482 BTRFS_SETGET_FUNCS(qgroup_limit_flags, struct btrfs_qgroup_limit_item,
2483                    flags, 64);
2484 BTRFS_SETGET_FUNCS(qgroup_limit_max_rfer, struct btrfs_qgroup_limit_item,
2485                    max_rfer, 64);
2486 BTRFS_SETGET_FUNCS(qgroup_limit_max_excl, struct btrfs_qgroup_limit_item,
2487                    max_excl, 64);
2488 BTRFS_SETGET_FUNCS(qgroup_limit_rsv_rfer, struct btrfs_qgroup_limit_item,
2489                    rsv_rfer, 64);
2490 BTRFS_SETGET_FUNCS(qgroup_limit_rsv_excl, struct btrfs_qgroup_limit_item,
2491                    rsv_excl, 64);
2492
2493 /* btrfs_dev_replace_item */
2494 BTRFS_SETGET_FUNCS(dev_replace_src_devid,
2495                    struct btrfs_dev_replace_item, src_devid, 64);
2496 BTRFS_SETGET_FUNCS(dev_replace_cont_reading_from_srcdev_mode,
2497                    struct btrfs_dev_replace_item, cont_reading_from_srcdev_mode,
2498                    64);
2499 BTRFS_SETGET_FUNCS(dev_replace_replace_state, struct btrfs_dev_replace_item,
2500                    replace_state, 64);
2501 BTRFS_SETGET_FUNCS(dev_replace_time_started, struct btrfs_dev_replace_item,
2502                    time_started, 64);
2503 BTRFS_SETGET_FUNCS(dev_replace_time_stopped, struct btrfs_dev_replace_item,
2504                    time_stopped, 64);
2505 BTRFS_SETGET_FUNCS(dev_replace_num_write_errors, struct btrfs_dev_replace_item,
2506                    num_write_errors, 64);
2507 BTRFS_SETGET_FUNCS(dev_replace_num_uncorrectable_read_errors,
2508                    struct btrfs_dev_replace_item, num_uncorrectable_read_errors,
2509                    64);
2510 BTRFS_SETGET_FUNCS(dev_replace_cursor_left, struct btrfs_dev_replace_item,
2511                    cursor_left, 64);
2512 BTRFS_SETGET_FUNCS(dev_replace_cursor_right, struct btrfs_dev_replace_item,
2513                    cursor_right, 64);
2514
2515 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_src_devid,
2516                          struct btrfs_dev_replace_item, src_devid, 64);
2517 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_cont_reading_from_srcdev_mode,
2518                          struct btrfs_dev_replace_item,
2519                          cont_reading_from_srcdev_mode, 64);
2520 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_replace_state,
2521                          struct btrfs_dev_replace_item, replace_state, 64);
2522 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_time_started,
2523                          struct btrfs_dev_replace_item, time_started, 64);
2524 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_time_stopped,
2525                          struct btrfs_dev_replace_item, time_stopped, 64);
2526 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_num_write_errors,
2527                          struct btrfs_dev_replace_item, num_write_errors, 64);
2528 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_num_uncorrectable_read_errors,
2529                          struct btrfs_dev_replace_item,
2530                          num_uncorrectable_read_errors, 64);
2531 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_cursor_left,
2532                          struct btrfs_dev_replace_item, cursor_left, 64);
2533 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_cursor_right,
2534                          struct btrfs_dev_replace_item, cursor_right, 64);
2535
2536 /* helper function to cast into the data area of the leaf. */
2537 #define btrfs_item_ptr(leaf, slot, type) \
2538         ((type *)(BTRFS_LEAF_DATA_OFFSET + \
2539         btrfs_item_offset_nr(leaf, slot)))
2540
2541 #define btrfs_item_ptr_offset(leaf, slot) \
2542         ((unsigned long)(BTRFS_LEAF_DATA_OFFSET + \
2543         btrfs_item_offset_nr(leaf, slot)))
2544
2545 static inline u64 btrfs_name_hash(const char *name, int len)
2546 {
2547        return crc32c((u32)~1, name, len);
2548 }
2549
2550 /*
2551  * Figure the key offset of an extended inode ref
2552  */
2553 static inline u64 btrfs_extref_hash(u64 parent_objectid, const char *name,
2554                                    int len)
2555 {
2556        return (u64) crc32c(parent_objectid, name, len);
2557 }
2558
2559 static inline bool btrfs_mixed_space_info(struct btrfs_space_info *space_info)
2560 {
2561         return ((space_info->flags & BTRFS_BLOCK_GROUP_METADATA) &&
2562                 (space_info->flags & BTRFS_BLOCK_GROUP_DATA));
2563 }
2564
2565 static inline gfp_t btrfs_alloc_write_mask(struct address_space *mapping)
2566 {
2567         return mapping_gfp_constraint(mapping, ~__GFP_FS);
2568 }
2569
2570 /* extent-tree.c */
2571
2572 enum btrfs_inline_ref_type {
2573         BTRFS_REF_TYPE_INVALID =         0,
2574         BTRFS_REF_TYPE_BLOCK =           1,
2575         BTRFS_REF_TYPE_DATA =            2,
2576         BTRFS_REF_TYPE_ANY =             3,
2577 };
2578
2579 int btrfs_get_extent_inline_ref_type(const struct extent_buffer *eb,
2580                                      struct btrfs_extent_inline_ref *iref,
2581                                      enum btrfs_inline_ref_type is_data);
2582
2583 u64 btrfs_csum_bytes_to_leaves(struct btrfs_fs_info *fs_info, u64 csum_bytes);
2584
2585 static inline u64 btrfs_calc_trans_metadata_size(struct btrfs_fs_info *fs_info,
2586                                                  unsigned num_items)
2587 {
2588         return (u64)fs_info->nodesize * BTRFS_MAX_LEVEL * 2 * num_items;
2589 }
2590
2591 /*
2592  * Doing a truncate won't result in new nodes or leaves, just what we need for
2593  * COW.
2594  */
2595 static inline u64 btrfs_calc_trunc_metadata_size(struct btrfs_fs_info *fs_info,
2596                                                  unsigned num_items)
2597 {
2598         return (u64)fs_info->nodesize * BTRFS_MAX_LEVEL * num_items;
2599 }
2600
2601 int btrfs_should_throttle_delayed_refs(struct btrfs_trans_handle *trans);
2602 int btrfs_check_space_for_delayed_refs(struct btrfs_trans_handle *trans);
2603 void btrfs_dec_block_group_reservations(struct btrfs_fs_info *fs_info,
2604                                          const u64 start);
2605 void btrfs_wait_block_group_reservations(struct btrfs_block_group_cache *bg);
2606 bool btrfs_inc_nocow_writers(struct btrfs_fs_info *fs_info, u64 bytenr);
2607 void btrfs_dec_nocow_writers(struct btrfs_fs_info *fs_info, u64 bytenr);
2608 void btrfs_wait_nocow_writers(struct btrfs_block_group_cache *bg);
2609 void btrfs_put_block_group(struct btrfs_block_group_cache *cache);
2610 int btrfs_run_delayed_refs(struct btrfs_trans_handle *trans,
2611                            unsigned long count);
2612 int btrfs_async_run_delayed_refs(struct btrfs_fs_info *fs_info,
2613                                  unsigned long count, u64 transid, int wait);
2614 int btrfs_lookup_data_extent(struct btrfs_fs_info *fs_info, u64 start, u64 len);
2615 int btrfs_lookup_extent_info(struct btrfs_trans_handle *trans,
2616                              struct btrfs_fs_info *fs_info, u64 bytenr,
2617                              u64 offset, int metadata, u64 *refs, u64 *flags);
2618 int btrfs_pin_extent(struct btrfs_fs_info *fs_info,
2619                      u64 bytenr, u64 num, int reserved);
2620 int btrfs_pin_extent_for_log_replay(struct btrfs_fs_info *fs_info,
2621                                     u64 bytenr, u64 num_bytes);
2622 int btrfs_exclude_logged_extents(struct btrfs_fs_info *fs_info,
2623                                  struct extent_buffer *eb);
2624 int btrfs_cross_ref_exist(struct btrfs_root *root,
2625                           u64 objectid, u64 offset, u64 bytenr);
2626 struct btrfs_block_group_cache *btrfs_lookup_block_group(
2627                                                  struct btrfs_fs_info *info,
2628                                                  u64 bytenr);
2629 void btrfs_get_block_group(struct btrfs_block_group_cache *cache);
2630 void btrfs_put_block_group(struct btrfs_block_group_cache *cache);
2631 struct extent_buffer *btrfs_alloc_tree_block(struct btrfs_trans_handle *trans,
2632                                              struct btrfs_root *root,
2633                                              u64 parent, u64 root_objectid,
2634                                              const struct btrfs_disk_key *key,
2635                                              int level, u64 hint,
2636                                              u64 empty_size);
2637 void btrfs_free_tree_block(struct btrfs_trans_handle *trans,
2638                            struct btrfs_root *root,
2639                            struct extent_buffer *buf,
2640                            u64 parent, int last_ref);
2641 int btrfs_alloc_reserved_file_extent(struct btrfs_trans_handle *trans,
2642                                      struct btrfs_root *root, u64 owner,
2643                                      u64 offset, u64 ram_bytes,
2644                                      struct btrfs_key *ins);
2645 int btrfs_alloc_logged_file_extent(struct btrfs_trans_handle *trans,
2646                                    u64 root_objectid, u64 owner, u64 offset,
2647                                    struct btrfs_key *ins);
2648 int btrfs_reserve_extent(struct btrfs_root *root, u64 ram_bytes, u64 num_bytes,
2649                          u64 min_alloc_size, u64 empty_size, u64 hint_byte,
2650                          struct btrfs_key *ins, int is_data, int delalloc);
2651 int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2652                   struct extent_buffer *buf, int full_backref);
2653 int btrfs_dec_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2654                   struct extent_buffer *buf, int full_backref);
2655 int btrfs_set_disk_extent_flags(struct btrfs_trans_handle *trans,
2656                                 struct btrfs_fs_info *fs_info,
2657                                 u64 bytenr, u64 num_bytes, u64 flags,
2658                                 int level, int is_data);
2659 int btrfs_free_extent(struct btrfs_trans_handle *trans,
2660                       struct btrfs_root *root,
2661                       u64 bytenr, u64 num_bytes, u64 parent, u64 root_objectid,
2662                       u64 owner, u64 offset);
2663
2664 int btrfs_free_reserved_extent(struct btrfs_fs_info *fs_info,
2665                                u64 start, u64 len, int delalloc);
2666 int btrfs_free_and_pin_reserved_extent(struct btrfs_fs_info *fs_info,
2667                                        u64 start, u64 len);
2668 void btrfs_prepare_extent_commit(struct btrfs_fs_info *fs_info);
2669 int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans);
2670 int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
2671                          struct btrfs_root *root,
2672                          u64 bytenr, u64 num_bytes, u64 parent,
2673                          u64 root_objectid, u64 owner, u64 offset);
2674
2675 int btrfs_start_dirty_block_groups(struct btrfs_trans_handle *trans);
2676 int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans,
2677                                    struct btrfs_fs_info *fs_info);
2678 int btrfs_setup_space_cache(struct btrfs_trans_handle *trans,
2679                             struct btrfs_fs_info *fs_info);
2680 int btrfs_extent_readonly(struct btrfs_fs_info *fs_info, u64 bytenr);
2681 int btrfs_free_block_groups(struct btrfs_fs_info *info);
2682 int btrfs_read_block_groups(struct btrfs_fs_info *info);
2683 int btrfs_can_relocate(struct btrfs_fs_info *fs_info, u64 bytenr);
2684 int btrfs_make_block_group(struct btrfs_trans_handle *trans,
2685                            u64 bytes_used, u64 type, u64 chunk_offset,
2686                            u64 size);
2687 void btrfs_add_raid_kobjects(struct btrfs_fs_info *fs_info);
2688 struct btrfs_trans_handle *btrfs_start_trans_remove_block_group(
2689                                 struct btrfs_fs_info *fs_info,
2690                                 const u64 chunk_offset);
2691 int btrfs_remove_block_group(struct btrfs_trans_handle *trans,
2692                              u64 group_start, struct extent_map *em);
2693 void btrfs_delete_unused_bgs(struct btrfs_fs_info *fs_info);
2694 void btrfs_get_block_group_trimming(struct btrfs_block_group_cache *cache);
2695 void btrfs_put_block_group_trimming(struct btrfs_block_group_cache *cache);
2696 void btrfs_create_pending_block_groups(struct btrfs_trans_handle *trans);
2697 u64 btrfs_data_alloc_profile(struct btrfs_fs_info *fs_info);
2698 u64 btrfs_metadata_alloc_profile(struct btrfs_fs_info *fs_info);
2699 u64 btrfs_system_alloc_profile(struct btrfs_fs_info *fs_info);
2700 void btrfs_clear_space_info_full(struct btrfs_fs_info *info);
2701
2702 enum btrfs_reserve_flush_enum {
2703         /* If we are in the transaction, we can't flush anything.*/
2704         BTRFS_RESERVE_NO_FLUSH,
2705         /*
2706          * Flushing delalloc may cause deadlock somewhere, in this
2707          * case, use FLUSH LIMIT
2708          */
2709         BTRFS_RESERVE_FLUSH_LIMIT,
2710         BTRFS_RESERVE_FLUSH_ALL,
2711 };
2712
2713 enum btrfs_flush_state {
2714         FLUSH_DELAYED_ITEMS_NR  =       1,
2715         FLUSH_DELAYED_ITEMS     =       2,
2716         FLUSH_DELALLOC          =       3,
2717         FLUSH_DELALLOC_WAIT     =       4,
2718         ALLOC_CHUNK             =       5,
2719         COMMIT_TRANS            =       6,
2720 };
2721
2722 int btrfs_alloc_data_chunk_ondemand(struct btrfs_inode *inode, u64 bytes);
2723 int btrfs_check_data_free_space(struct inode *inode,
2724                         struct extent_changeset **reserved, u64 start, u64 len);
2725 void btrfs_free_reserved_data_space(struct inode *inode,
2726                         struct extent_changeset *reserved, u64 start, u64 len);
2727 void btrfs_delalloc_release_space(struct inode *inode,
2728                                   struct extent_changeset *reserved,
2729                                   u64 start, u64 len, bool qgroup_free);
2730 void btrfs_free_reserved_data_space_noquota(struct inode *inode, u64 start,
2731                                             u64 len);
2732 void btrfs_trans_release_chunk_metadata(struct btrfs_trans_handle *trans);
2733 int btrfs_subvolume_reserve_metadata(struct btrfs_root *root,
2734                                      struct btrfs_block_rsv *rsv,
2735                                      int nitems, bool use_global_rsv);
2736 void btrfs_subvolume_release_metadata(struct btrfs_fs_info *fs_info,
2737                                       struct btrfs_block_rsv *rsv);
2738 void btrfs_delalloc_release_extents(struct btrfs_inode *inode, u64 num_bytes,
2739                                     bool qgroup_free);
2740
2741 int btrfs_delalloc_reserve_metadata(struct btrfs_inode *inode, u64 num_bytes);
2742 void btrfs_delalloc_release_metadata(struct btrfs_inode *inode, u64 num_bytes,
2743                                      bool qgroup_free);
2744 int btrfs_delalloc_reserve_space(struct inode *inode,
2745                         struct extent_changeset **reserved, u64 start, u64 len);
2746 void btrfs_init_block_rsv(struct btrfs_block_rsv *rsv, unsigned short type);
2747 struct btrfs_block_rsv *btrfs_alloc_block_rsv(struct btrfs_fs_info *fs_info,
2748                                               unsigned short type);
2749 void btrfs_init_metadata_block_rsv(struct btrfs_fs_info *fs_info,
2750                                    struct btrfs_block_rsv *rsv,
2751                                    unsigned short type);
2752 void btrfs_free_block_rsv(struct btrfs_fs_info *fs_info,
2753                           struct btrfs_block_rsv *rsv);
2754 int btrfs_block_rsv_add(struct btrfs_root *root,
2755                         struct btrfs_block_rsv *block_rsv, u64 num_bytes,
2756                         enum btrfs_reserve_flush_enum flush);
2757 int btrfs_block_rsv_check(struct btrfs_block_rsv *block_rsv, int min_factor);
2758 int btrfs_block_rsv_refill(struct btrfs_root *root,
2759                            struct btrfs_block_rsv *block_rsv, u64 min_reserved,
2760                            enum btrfs_reserve_flush_enum flush);
2761 int btrfs_block_rsv_migrate(struct btrfs_block_rsv *src_rsv,
2762                             struct btrfs_block_rsv *dst_rsv, u64 num_bytes,
2763                             bool update_size);
2764 int btrfs_cond_migrate_bytes(struct btrfs_fs_info *fs_info,
2765                              struct btrfs_block_rsv *dest, u64 num_bytes,
2766                              int min_factor);
2767 void btrfs_block_rsv_release(struct btrfs_fs_info *fs_info,
2768                              struct btrfs_block_rsv *block_rsv,
2769                              u64 num_bytes);
2770 int btrfs_inc_block_group_ro(struct btrfs_block_group_cache *cache);
2771 void btrfs_dec_block_group_ro(struct btrfs_block_group_cache *cache);
2772 void btrfs_put_block_group_cache(struct btrfs_fs_info *info);
2773 u64 btrfs_account_ro_block_groups_free_space(struct btrfs_space_info *sinfo);
2774 int btrfs_error_unpin_extent_range(struct btrfs_fs_info *fs_info,
2775                                    u64 start, u64 end);
2776 int btrfs_discard_extent(struct btrfs_fs_info *fs_info, u64 bytenr,
2777                          u64 num_bytes, u64 *actual_bytes);
2778 int btrfs_force_chunk_alloc(struct btrfs_trans_handle *trans, u64 type);
2779 int btrfs_trim_fs(struct btrfs_fs_info *fs_info, struct fstrim_range *range);
2780
2781 int btrfs_init_space_info(struct btrfs_fs_info *fs_info);
2782 int btrfs_delayed_refs_qgroup_accounting(struct btrfs_trans_handle *trans,
2783                                          struct btrfs_fs_info *fs_info);
2784 int btrfs_start_write_no_snapshotting(struct btrfs_root *root);
2785 void btrfs_end_write_no_snapshotting(struct btrfs_root *root);
2786 void btrfs_wait_for_snapshot_creation(struct btrfs_root *root);
2787 void check_system_chunk(struct btrfs_trans_handle *trans, const u64 type);
2788 u64 add_new_free_space(struct btrfs_block_group_cache *block_group,
2789                        u64 start, u64 end);
2790 void btrfs_mark_bg_unused(struct btrfs_block_group_cache *bg);
2791
2792 /* ctree.c */
2793 int btrfs_bin_search(struct extent_buffer *eb, const struct btrfs_key *key,
2794                      int level, int *slot);
2795 int btrfs_comp_cpu_keys(const struct btrfs_key *k1, const struct btrfs_key *k2);
2796 int btrfs_previous_item(struct btrfs_root *root,
2797                         struct btrfs_path *path, u64 min_objectid,
2798                         int type);
2799 int btrfs_previous_extent_item(struct btrfs_root *root,
2800                         struct btrfs_path *path, u64 min_objectid);
2801 void btrfs_set_item_key_safe(struct btrfs_fs_info *fs_info,
2802                              struct btrfs_path *path,
2803                              const struct btrfs_key *new_key);
2804 struct extent_buffer *btrfs_root_node(struct btrfs_root *root);
2805 struct extent_buffer *btrfs_lock_root_node(struct btrfs_root *root);
2806 struct extent_buffer *btrfs_read_lock_root_node(struct btrfs_root *root);
2807 int btrfs_find_next_key(struct btrfs_root *root, struct btrfs_path *path,
2808                         struct btrfs_key *key, int lowest_level,
2809                         u64 min_trans);
2810 int btrfs_search_forward(struct btrfs_root *root, struct btrfs_key *min_key,
2811                          struct btrfs_path *path,
2812                          u64 min_trans);
2813 enum btrfs_compare_tree_result {
2814         BTRFS_COMPARE_TREE_NEW,
2815         BTRFS_COMPARE_TREE_DELETED,
2816         BTRFS_COMPARE_TREE_CHANGED,
2817         BTRFS_COMPARE_TREE_SAME,
2818 };
2819 typedef int (*btrfs_changed_cb_t)(struct btrfs_path *left_path,
2820                                   struct btrfs_path *right_path,
2821                                   struct btrfs_key *key,
2822                                   enum btrfs_compare_tree_result result,
2823                                   void *ctx);
2824 int btrfs_compare_trees(struct btrfs_root *left_root,
2825                         struct btrfs_root *right_root,
2826                         btrfs_changed_cb_t cb, void *ctx);
2827 int btrfs_cow_block(struct btrfs_trans_handle *trans,
2828                     struct btrfs_root *root, struct extent_buffer *buf,
2829                     struct extent_buffer *parent, int parent_slot,
2830                     struct extent_buffer **cow_ret);
2831 int btrfs_copy_root(struct btrfs_trans_handle *trans,
2832                       struct btrfs_root *root,
2833                       struct extent_buffer *buf,
2834                       struct extent_buffer **cow_ret, u64 new_root_objectid);
2835 int btrfs_block_can_be_shared(struct btrfs_root *root,
2836                               struct extent_buffer *buf);
2837 void btrfs_extend_item(struct btrfs_fs_info *fs_info, struct btrfs_path *path,
2838                        u32 data_size);
2839 void btrfs_truncate_item(struct btrfs_fs_info *fs_info,
2840                          struct btrfs_path *path, u32 new_size, int from_end);
2841 int btrfs_split_item(struct btrfs_trans_handle *trans,
2842                      struct btrfs_root *root,
2843                      struct btrfs_path *path,
2844                      const struct btrfs_key *new_key,
2845                      unsigned long split_offset);
2846 int btrfs_duplicate_item(struct btrfs_trans_handle *trans,
2847                          struct btrfs_root *root,
2848                          struct btrfs_path *path,
2849                          const struct btrfs_key *new_key);
2850 int btrfs_find_item(struct btrfs_root *fs_root, struct btrfs_path *path,
2851                 u64 inum, u64 ioff, u8 key_type, struct btrfs_key *found_key);
2852 int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2853                       const struct btrfs_key *key, struct btrfs_path *p,
2854                       int ins_len, int cow);
2855 int btrfs_search_old_slot(struct btrfs_root *root, const struct btrfs_key *key,
2856                           struct btrfs_path *p, u64 time_seq);
2857 int btrfs_search_slot_for_read(struct btrfs_root *root,
2858                                const struct btrfs_key *key,
2859                                struct btrfs_path *p, int find_higher,
2860                                int return_any);
2861 int btrfs_realloc_node(struct btrfs_trans_handle *trans,
2862                        struct btrfs_root *root, struct extent_buffer *parent,
2863                        int start_slot, u64 *last_ret,
2864                        struct btrfs_key *progress);
2865 void btrfs_release_path(struct btrfs_path *p);
2866 struct btrfs_path *btrfs_alloc_path(void);
2867 void btrfs_free_path(struct btrfs_path *p);
2868 void btrfs_set_path_blocking(struct btrfs_path *p);
2869 void btrfs_unlock_up_safe(struct btrfs_path *p, int level);
2870
2871 int btrfs_del_items(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2872                    struct btrfs_path *path, int slot, int nr);
2873 static inline int btrfs_del_item(struct btrfs_trans_handle *trans,
2874                                  struct btrfs_root *root,
2875                                  struct btrfs_path *path)
2876 {
2877         return btrfs_del_items(trans, root, path, path->slots[0], 1);
2878 }
2879
2880 void setup_items_for_insert(struct btrfs_root *root, struct btrfs_path *path,
2881                             const struct btrfs_key *cpu_key, u32 *data_size,
2882                             u32 total_data, u32 total_size, int nr);
2883 int btrfs_insert_item(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2884                       const struct btrfs_key *key, void *data, u32 data_size);
2885 int btrfs_insert_empty_items(struct btrfs_trans_handle *trans,
2886                              struct btrfs_root *root,
2887                              struct btrfs_path *path,
2888                              const struct btrfs_key *cpu_key, u32 *data_size,
2889                              int nr);
2890
2891 static inline int btrfs_insert_empty_item(struct btrfs_trans_handle *trans,
2892                                           struct btrfs_root *root,
2893                                           struct btrfs_path *path,
2894                                           const struct btrfs_key *key,
2895                                           u32 data_size)
2896 {
2897         return btrfs_insert_empty_items(trans, root, path, key, &data_size, 1);
2898 }
2899
2900 int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path);
2901 int btrfs_prev_leaf(struct btrfs_root *root, struct btrfs_path *path);
2902 int btrfs_next_old_leaf(struct btrfs_root *root, struct btrfs_path *path,
2903                         u64 time_seq);
2904 static inline int btrfs_next_old_item(struct btrfs_root *root,
2905                                       struct btrfs_path *p, u64 time_seq)
2906 {
2907         ++p->slots[0];
2908         if (p->slots[0] >= btrfs_header_nritems(p->nodes[0]))
2909                 return btrfs_next_old_leaf(root, p, time_seq);
2910         return 0;
2911 }
2912 static inline int btrfs_next_item(struct btrfs_root *root, struct btrfs_path *p)
2913 {
2914         return btrfs_next_old_item(root, p, 0);
2915 }
2916 int btrfs_leaf_free_space(struct btrfs_fs_info *fs_info,
2917                           struct extent_buffer *leaf);
2918 int __must_check btrfs_drop_snapshot(struct btrfs_root *root,
2919                                      struct btrfs_block_rsv *block_rsv,
2920                                      int update_ref, int for_reloc);
2921 int btrfs_drop_subtree(struct btrfs_trans_handle *trans,
2922                         struct btrfs_root *root,
2923                         struct extent_buffer *node,
2924                         struct extent_buffer *parent);
2925 static inline int btrfs_fs_closing(struct btrfs_fs_info *fs_info)
2926 {
2927         /*
2928          * Do it this way so we only ever do one test_bit in the normal case.
2929          */
2930         if (test_bit(BTRFS_FS_CLOSING_START, &fs_info->flags)) {
2931                 if (test_bit(BTRFS_FS_CLOSING_DONE, &fs_info->flags))
2932                         return 2;
2933                 return 1;
2934         }
2935         return 0;
2936 }
2937
2938 /*
2939  * If we remount the fs to be R/O or umount the fs, the cleaner needn't do
2940  * anything except sleeping. This function is used to check the status of
2941  * the fs.
2942  */
2943 static inline int btrfs_need_cleaner_sleep(struct btrfs_fs_info *fs_info)
2944 {
2945         return fs_info->sb->s_flags & SB_RDONLY || btrfs_fs_closing(fs_info);
2946 }
2947
2948 static inline void free_fs_info(struct btrfs_fs_info *fs_info)
2949 {
2950         kfree(fs_info->balance_ctl);
2951         kfree(fs_info->delayed_root);
2952         kfree(fs_info->extent_root);
2953         kfree(fs_info->tree_root);
2954         kfree(fs_info->chunk_root);
2955         kfree(fs_info->dev_root);
2956         kfree(fs_info->csum_root);
2957         kfree(fs_info->quota_root);
2958         kfree(fs_info->uuid_root);
2959         kfree(fs_info->free_space_root);
2960         kfree(fs_info->super_copy);
2961         kfree(fs_info->super_for_commit);
2962         security_free_mnt_opts(&fs_info->security_opts);
2963         kvfree(fs_info);
2964 }
2965
2966 /* tree mod log functions from ctree.c */
2967 u64 btrfs_get_tree_mod_seq(struct btrfs_fs_info *fs_info,
2968                            struct seq_list *elem);
2969 void btrfs_put_tree_mod_seq(struct btrfs_fs_info *fs_info,
2970                             struct seq_list *elem);
2971 int btrfs_old_root_level(struct btrfs_root *root, u64 time_seq);
2972
2973 /* root-item.c */
2974 int btrfs_add_root_ref(struct btrfs_trans_handle *trans, u64 root_id,
2975                        u64 ref_id, u64 dirid, u64 sequence, const char *name,
2976                        int name_len);
2977 int btrfs_del_root_ref(struct btrfs_trans_handle *trans, u64 root_id,
2978                        u64 ref_id, u64 dirid, u64 *sequence, const char *name,
2979                        int name_len);
2980 int btrfs_del_root(struct btrfs_trans_handle *trans,
2981                    const struct btrfs_key *key);
2982 int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2983                       const struct btrfs_key *key,
2984                       struct btrfs_root_item *item);
2985 int __must_check btrfs_update_root(struct btrfs_trans_handle *trans,
2986                                    struct btrfs_root *root,
2987                                    struct btrfs_key *key,
2988                                    struct btrfs_root_item *item);
2989 int btrfs_find_root(struct btrfs_root *root, const struct btrfs_key *search_key,
2990                     struct btrfs_path *path, struct btrfs_root_item *root_item,
2991                     struct btrfs_key *root_key);
2992 int btrfs_find_orphan_roots(struct btrfs_fs_info *fs_info);
2993 void btrfs_set_root_node(struct btrfs_root_item *item,
2994                          struct extent_buffer *node);
2995 void btrfs_check_and_init_root_item(struct btrfs_root_item *item);
2996 void btrfs_update_root_times(struct btrfs_trans_handle *trans,
2997                              struct btrfs_root *root);
2998
2999 /* uuid-tree.c */
3000 int btrfs_uuid_tree_add(struct btrfs_trans_handle *trans, u8 *uuid, u8 type,
3001                         u64 subid);
3002 int btrfs_uuid_tree_remove(struct btrfs_trans_handle *trans, u8 *uuid, u8 type,
3003                         u64 subid);
3004 int btrfs_uuid_tree_iterate(struct btrfs_fs_info *fs_info,
3005                             int (*check_func)(struct btrfs_fs_info *, u8 *, u8,
3006                                               u64));
3007
3008 /* dir-item.c */
3009 int btrfs_check_dir_item_collision(struct btrfs_root *root, u64 dir,
3010                           const char *name, int name_len);
3011 int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, const char *name,
3012                           int name_len, struct btrfs_inode *dir,
3013                           struct btrfs_key *location, u8 type, u64 index);
3014 struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans,
3015                                              struct btrfs_root *root,
3016                                              struct btrfs_path *path, u64 dir,
3017                                              const char *name, int name_len,
3018                                              int mod);
3019 struct btrfs_dir_item *
3020 btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans,
3021                             struct btrfs_root *root,
3022                             struct btrfs_path *path, u64 dir,
3023                             u64 objectid, const char *name, int name_len,
3024                             int mod);
3025 struct btrfs_dir_item *
3026 btrfs_search_dir_index_item(struct btrfs_root *root,
3027                             struct btrfs_path *path, u64 dirid,
3028                             const char *name, int name_len);
3029 int btrfs_delete_one_dir_name(struct btrfs_trans_handle *trans,
3030                               struct btrfs_root *root,
3031                               struct btrfs_path *path,
3032                               struct btrfs_dir_item *di);
3033 int btrfs_insert_xattr_item(struct btrfs_trans_handle *trans,
3034                             struct btrfs_root *root,
3035                             struct btrfs_path *path, u64 objectid,
3036                             const char *name, u16 name_len,
3037                             const void *data, u16 data_len);
3038 struct btrfs_dir_item *btrfs_lookup_xattr(struct btrfs_trans_handle *trans,
3039                                           struct btrfs_root *root,
3040                                           struct btrfs_path *path, u64 dir,
3041                                           const char *name, u16 name_len,
3042                                           int mod);
3043 struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_fs_info *fs_info,
3044                                                  struct btrfs_path *path,
3045                                                  const char *name,
3046                                                  int name_len);
3047
3048 /* orphan.c */
3049 int btrfs_insert_orphan_item(struct btrfs_trans_handle *trans,
3050                              struct btrfs_root *root, u64 offset);
3051 int btrfs_del_orphan_item(struct btrfs_trans_handle *trans,
3052                           struct btrfs_root *root, u64 offset);
3053 int btrfs_find_orphan_item(struct btrfs_root *root, u64 offset);
3054
3055 /* inode-item.c */
3056 int btrfs_insert_inode_ref(struct btrfs_trans_handle *trans,
3057                            struct btrfs_root *root,
3058                            const char *name, int name_len,
3059                            u64 inode_objectid, u64 ref_objectid, u64 index);
3060 int btrfs_del_inode_ref(struct btrfs_trans_handle *trans,
3061                            struct btrfs_root *root,
3062                            const char *name, int name_len,
3063                            u64 inode_objectid, u64 ref_objectid, u64 *index);
3064 int btrfs_insert_empty_inode(struct btrfs_trans_handle *trans,
3065                              struct btrfs_root *root,
3066                              struct btrfs_path *path, u64 objectid);
3067 int btrfs_lookup_inode(struct btrfs_trans_handle *trans, struct btrfs_root
3068                        *root, struct btrfs_path *path,
3069                        struct btrfs_key *location, int mod);
3070
3071 struct btrfs_inode_extref *
3072 btrfs_lookup_inode_extref(struct btrfs_trans_handle *trans,
3073                           struct btrfs_root *root,
3074                           struct btrfs_path *path,
3075                           const char *name, int name_len,
3076                           u64 inode_objectid, u64 ref_objectid, int ins_len,
3077                           int cow);
3078
3079 int btrfs_find_name_in_backref(struct extent_buffer *leaf, int slot,
3080                                const char *name,
3081                                int name_len, struct btrfs_inode_ref **ref_ret);
3082 int btrfs_find_name_in_ext_backref(struct extent_buffer *leaf, int slot,
3083                                    u64 ref_objectid, const char *name,
3084                                    int name_len,
3085                                    struct btrfs_inode_extref **extref_ret);
3086
3087 /* file-item.c */
3088 struct btrfs_dio_private;
3089 int btrfs_del_csums(struct btrfs_trans_handle *trans,
3090                     struct btrfs_fs_info *fs_info, u64 bytenr, u64 len);
3091 blk_status_t btrfs_lookup_bio_sums(struct inode *inode, struct bio *bio, u32 *dst);
3092 blk_status_t btrfs_lookup_bio_sums_dio(struct inode *inode, struct bio *bio,
3093                               u64 logical_offset);
3094 int btrfs_insert_file_extent(struct btrfs_trans_handle *trans,
3095                              struct btrfs_root *root,
3096                              u64 objectid, u64 pos,
3097                              u64 disk_offset, u64 disk_num_bytes,
3098                              u64 num_bytes, u64 offset, u64 ram_bytes,
3099                              u8 compression, u8 encryption, u16 other_encoding);
3100 int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
3101                              struct btrfs_root *root,
3102                              struct btrfs_path *path, u64 objectid,
3103                              u64 bytenr, int mod);
3104 int btrfs_csum_file_blocks(struct btrfs_trans_handle *trans,
3105                            struct btrfs_root *root,
3106                            struct btrfs_ordered_sum *sums);
3107 blk_status_t btrfs_csum_one_bio(struct inode *inode, struct bio *bio,
3108                        u64 file_start, int contig);
3109 int btrfs_lookup_csums_range(struct btrfs_root *root, u64 start, u64 end,
3110                              struct list_head *list, int search_commit);
3111 void btrfs_extent_item_to_extent_map(struct btrfs_inode *inode,
3112                                      const struct btrfs_path *path,
3113                                      struct btrfs_file_extent_item *fi,
3114                                      const bool new_inline,
3115                                      struct extent_map *em);
3116
3117 /* inode.c */
3118 struct extent_map *btrfs_get_extent_fiemap(struct btrfs_inode *inode,
3119                 struct page *page, size_t pg_offset, u64 start,
3120                 u64 len, int create);
3121 noinline int can_nocow_extent(struct inode *inode, u64 offset, u64 *len,
3122                               u64 *orig_start, u64 *orig_block_len,
3123                               u64 *ram_bytes);
3124
3125 void __btrfs_del_delalloc_inode(struct btrfs_root *root,
3126                                 struct btrfs_inode *inode);
3127 struct inode *btrfs_lookup_dentry(struct inode *dir, struct dentry *dentry);
3128 int btrfs_set_inode_index(struct btrfs_inode *dir, u64 *index);
3129 int btrfs_unlink_inode(struct btrfs_trans_handle *trans,
3130                        struct btrfs_root *root,
3131                        struct btrfs_inode *dir, struct btrfs_inode *inode,
3132                        const char *name, int name_len);
3133 int btrfs_add_link(struct btrfs_trans_handle *trans,
3134                    struct btrfs_inode *parent_inode, struct btrfs_inode *inode,
3135                    const char *name, int name_len, int add_backref, u64 index);
3136 int btrfs_delete_subvolume(struct inode *dir, struct dentry *dentry);
3137 int btrfs_truncate_block(struct inode *inode, loff_t from, loff_t len,
3138                         int front);
3139 int btrfs_truncate_inode_items(struct btrfs_trans_handle *trans,
3140                                struct btrfs_root *root,
3141                                struct inode *inode, u64 new_size,
3142                                u32 min_type);
3143
3144 int btrfs_start_delalloc_inodes(struct btrfs_root *root);
3145 int btrfs_start_delalloc_roots(struct btrfs_fs_info *fs_info, int nr);
3146 int btrfs_set_extent_delalloc(struct inode *inode, u64 start, u64 end,
3147                               unsigned int extra_bits,
3148                               struct extent_state **cached_state, int dedupe);
3149 int btrfs_create_subvol_root(struct btrfs_trans_handle *trans,
3150                              struct btrfs_root *new_root,
3151                              struct btrfs_root *parent_root,
3152                              u64 new_dirid);
3153 int btrfs_merge_bio_hook(struct page *page, unsigned long offset,
3154                          size_t size, struct bio *bio,
3155                          unsigned long bio_flags);
3156 void btrfs_set_range_writeback(struct extent_io_tree *tree, u64 start, u64 end);
3157 vm_fault_t btrfs_page_mkwrite(struct vm_fault *vmf);
3158 int btrfs_readpage(struct file *file, struct page *page);
3159 void btrfs_evict_inode(struct inode *inode);
3160 int btrfs_write_inode(struct inode *inode, struct writeback_control *wbc);
3161 struct inode *btrfs_alloc_inode(struct super_block *sb);
3162 void btrfs_destroy_inode(struct inode *inode);
3163 int btrfs_drop_inode(struct inode *inode);
3164 int __init btrfs_init_cachep(void);
3165 void __cold btrfs_destroy_cachep(void);
3166 struct inode *btrfs_iget_path(struct super_block *s, struct btrfs_key *location,
3167                               struct btrfs_root *root, int *new,
3168                               struct btrfs_path *path);
3169 struct inode *btrfs_iget(struct super_block *s, struct btrfs_key *location,
3170                          struct btrfs_root *root, int *was_new);
3171 struct extent_map *btrfs_get_extent(struct btrfs_inode *inode,
3172                                     struct page *page, size_t pg_offset,
3173                                     u64 start, u64 end, int create);
3174 int btrfs_update_inode(struct btrfs_trans_handle *trans,
3175                               struct btrfs_root *root,
3176                               struct inode *inode);
3177 int btrfs_update_inode_fallback(struct btrfs_trans_handle *trans,
3178                                 struct btrfs_root *root, struct inode *inode);
3179 int btrfs_orphan_add(struct btrfs_trans_handle *trans,
3180                 struct btrfs_inode *inode);
3181 int btrfs_orphan_cleanup(struct btrfs_root *root);
3182 int btrfs_cont_expand(struct inode *inode, loff_t oldsize, loff_t size);
3183 void btrfs_add_delayed_iput(struct inode *inode);
3184 void btrfs_run_delayed_iputs(struct btrfs_fs_info *fs_info);
3185 int btrfs_prealloc_file_range(struct inode *inode, int mode,
3186                               u64 start, u64 num_bytes, u64 min_size,
3187                               loff_t actual_len, u64 *alloc_hint);
3188 int btrfs_prealloc_file_range_trans(struct inode *inode,
3189                                     struct btrfs_trans_handle *trans, int mode,
3190                                     u64 start, u64 num_bytes, u64 min_size,
3191                                     loff_t actual_len, u64 *alloc_hint);
3192 extern const struct dentry_operations btrfs_dentry_operations;
3193
3194 /* ioctl.c */
3195 long btrfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
3196 long btrfs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
3197 int btrfs_ioctl_get_supported_features(void __user *arg);
3198 void btrfs_sync_inode_flags_to_i_flags(struct inode *inode);
3199 int btrfs_is_empty_uuid(u8 *uuid);
3200 int btrfs_defrag_file(struct inode *inode, struct file *file,
3201                       struct btrfs_ioctl_defrag_range_args *range,
3202                       u64 newer_than, unsigned long max_pages);
3203 void btrfs_get_block_group_info(struct list_head *groups_list,
3204                                 struct btrfs_ioctl_space_info *space);
3205 void btrfs_update_ioctl_balance_args(struct btrfs_fs_info *fs_info,
3206                                struct btrfs_ioctl_balance_args *bargs);
3207
3208 /* file.c */
3209 int __init btrfs_auto_defrag_init(void);
3210 void __cold btrfs_auto_defrag_exit(void);
3211 int btrfs_add_inode_defrag(struct btrfs_trans_handle *trans,
3212                            struct btrfs_inode *inode);
3213 int btrfs_run_defrag_inodes(struct btrfs_fs_info *fs_info);
3214 void btrfs_cleanup_defrag_inodes(struct btrfs_fs_info *fs_info);
3215 int btrfs_sync_file(struct file *file, loff_t start, loff_t end, int datasync);
3216 void btrfs_drop_extent_cache(struct btrfs_inode *inode, u64 start, u64 end,
3217                              int skip_pinned);
3218 extern const struct file_operations btrfs_file_operations;
3219 int __btrfs_drop_extents(struct btrfs_trans_handle *trans,
3220                          struct btrfs_root *root, struct inode *inode,
3221                          struct btrfs_path *path, u64 start, u64 end,
3222                          u64 *drop_end, int drop_cache,
3223                          int replace_extent,
3224                          u32 extent_item_size,
3225                          int *key_inserted);
3226 int btrfs_drop_extents(struct btrfs_trans_handle *trans,
3227                        struct btrfs_root *root, struct inode *inode, u64 start,
3228                        u64 end, int drop_cache);
3229 int btrfs_mark_extent_written(struct btrfs_trans_handle *trans,
3230                               struct btrfs_inode *inode, u64 start, u64 end);
3231 int btrfs_release_file(struct inode *inode, struct file *file);
3232 int btrfs_dirty_pages(struct inode *inode, struct page **pages,
3233                       size_t num_pages, loff_t pos, size_t write_bytes,
3234                       struct extent_state **cached);
3235 int btrfs_fdatawrite_range(struct inode *inode, loff_t start, loff_t end);
3236 loff_t btrfs_remap_file_range(struct file *file_in, loff_t pos_in,
3237                               struct file *file_out, loff_t pos_out,
3238                               loff_t len, unsigned int remap_flags);
3239
3240 /* tree-defrag.c */
3241 int btrfs_defrag_leaves(struct btrfs_trans_handle *trans,
3242                         struct btrfs_root *root);
3243
3244 /* sysfs.c */
3245 int __init btrfs_init_sysfs(void);
3246 void __cold btrfs_exit_sysfs(void);
3247 int btrfs_sysfs_add_mounted(struct btrfs_fs_info *fs_info);
3248 void btrfs_sysfs_remove_mounted(struct btrfs_fs_info *fs_info);
3249
3250 /* super.c */
3251 int btrfs_parse_options(struct btrfs_fs_info *info, char *options,
3252                         unsigned long new_flags);
3253 int btrfs_sync_fs(struct super_block *sb, int wait);
3254
3255 static inline __printf(2, 3) __cold
3256 void btrfs_no_printk(const struct btrfs_fs_info *fs_info, const char *fmt, ...)
3257 {
3258 }
3259
3260 #ifdef CONFIG_PRINTK
3261 __printf(2, 3)
3262 __cold
3263 void btrfs_printk(const struct btrfs_fs_info *fs_info, const char *fmt, ...);
3264 #else
3265 #define btrfs_printk(fs_info, fmt, args...) \
3266         btrfs_no_printk(fs_info, fmt, ##args)
3267 #endif
3268
3269 #define btrfs_emerg(fs_info, fmt, args...) \
3270         btrfs_printk(fs_info, KERN_EMERG fmt, ##args)
3271 #define btrfs_alert(fs_info, fmt, args...) \
3272         btrfs_printk(fs_info, KERN_ALERT fmt, ##args)
3273 #define btrfs_crit(fs_info, fmt, args...) \
3274         btrfs_printk(fs_info, KERN_CRIT fmt, ##args)
3275 #define btrfs_err(fs_info, fmt, args...) \
3276         btrfs_printk(fs_info, KERN_ERR fmt, ##args)
3277 #define btrfs_warn(fs_info, fmt, args...) \
3278         btrfs_printk(fs_info, KERN_WARNING fmt, ##args)
3279 #define btrfs_notice(fs_info, fmt, args...) \
3280         btrfs_printk(fs_info, KERN_NOTICE fmt, ##args)
3281 #define btrfs_info(fs_info, fmt, args...) \
3282         btrfs_printk(fs_info, KERN_INFO fmt, ##args)
3283
3284 /*
3285  * Wrappers that use printk_in_rcu
3286  */
3287 #define btrfs_emerg_in_rcu(fs_info, fmt, args...) \
3288         btrfs_printk_in_rcu(fs_info, KERN_EMERG fmt, ##args)
3289 #define btrfs_alert_in_rcu(fs_info, fmt, args...) \
3290         btrfs_printk_in_rcu(fs_info, KERN_ALERT fmt, ##args)
3291 #define btrfs_crit_in_rcu(fs_info, fmt, args...) \
3292         btrfs_printk_in_rcu(fs_info, KERN_CRIT fmt, ##args)
3293 #define btrfs_err_in_rcu(fs_info, fmt, args...) \
3294         btrfs_printk_in_rcu(fs_info, KERN_ERR fmt, ##args)
3295 #define btrfs_warn_in_rcu(fs_info, fmt, args...) \
3296         btrfs_printk_in_rcu(fs_info, KERN_WARNING fmt, ##args)
3297 #define btrfs_notice_in_rcu(fs_info, fmt, args...) \
3298         btrfs_printk_in_rcu(fs_info, KERN_NOTICE fmt, ##args)
3299 #define btrfs_info_in_rcu(fs_info, fmt, args...) \
3300         btrfs_printk_in_rcu(fs_info, KERN_INFO fmt, ##args)
3301
3302 /*
3303  * Wrappers that use a ratelimited printk_in_rcu
3304  */
3305 #define btrfs_emerg_rl_in_rcu(fs_info, fmt, args...) \
3306         btrfs_printk_rl_in_rcu(fs_info, KERN_EMERG fmt, ##args)
3307 #define btrfs_alert_rl_in_rcu(fs_info, fmt, args...) \
3308         btrfs_printk_rl_in_rcu(fs_info, KERN_ALERT fmt, ##args)
3309 #define btrfs_crit_rl_in_rcu(fs_info, fmt, args...) \
3310         btrfs_printk_rl_in_rcu(fs_info, KERN_CRIT fmt, ##args)
3311 #define btrfs_err_rl_in_rcu(fs_info, fmt, args...) \
3312         btrfs_printk_rl_in_rcu(fs_info, KERN_ERR fmt, ##args)
3313 #define btrfs_warn_rl_in_rcu(fs_info, fmt, args...) \
3314         btrfs_printk_rl_in_rcu(fs_info, KERN_WARNING fmt, ##args)
3315 #define btrfs_notice_rl_in_rcu(fs_info, fmt, args...) \
3316         btrfs_printk_rl_in_rcu(fs_info, KERN_NOTICE fmt, ##args)
3317 #define btrfs_info_rl_in_rcu(fs_info, fmt, args...) \
3318         btrfs_printk_rl_in_rcu(fs_info, KERN_INFO fmt, ##args)
3319
3320 /*
3321  * Wrappers that use a ratelimited printk
3322  */
3323 #define btrfs_emerg_rl(fs_info, fmt, args...) \
3324         btrfs_printk_ratelimited(fs_info, KERN_EMERG fmt, ##args)
3325 #define btrfs_alert_rl(fs_info, fmt, args...) \
3326         btrfs_printk_ratelimited(fs_info, KERN_ALERT fmt, ##args)
3327 #define btrfs_crit_rl(fs_info, fmt, args...) \
3328         btrfs_printk_ratelimited(fs_info, KERN_CRIT fmt, ##args)
3329 #define btrfs_err_rl(fs_info, fmt, args...) \
3330         btrfs_printk_ratelimited(fs_info, KERN_ERR fmt, ##args)
3331 #define btrfs_warn_rl(fs_info, fmt, args...) \
3332         btrfs_printk_ratelimited(fs_info, KERN_WARNING fmt, ##args)
3333 #define btrfs_notice_rl(fs_info, fmt, args...) \
3334         btrfs_printk_ratelimited(fs_info, KERN_NOTICE fmt, ##args)
3335 #define btrfs_info_rl(fs_info, fmt, args...) \
3336         btrfs_printk_ratelimited(fs_info, KERN_INFO fmt, ##args)
3337
3338 #if defined(CONFIG_DYNAMIC_DEBUG)
3339 #define btrfs_debug(fs_info, fmt, args...)                              \
3340 do {                                                                    \
3341         DEFINE_DYNAMIC_DEBUG_METADATA(descriptor, fmt);                 \
3342         if (unlikely(descriptor.flags & _DPRINTK_FLAGS_PRINT))          \
3343                 btrfs_printk(fs_info, KERN_DEBUG fmt, ##args);          \
3344 } while (0)
3345 #define btrfs_debug_in_rcu(fs_info, fmt, args...)                       \
3346 do {                                                                    \
3347         DEFINE_DYNAMIC_DEBUG_METADATA(descriptor, fmt);                 \
3348         if (unlikely(descriptor.flags & _DPRINTK_FLAGS_PRINT))          \
3349                 btrfs_printk_in_rcu(fs_info, KERN_DEBUG fmt, ##args);   \
3350 } while (0)
3351 #define btrfs_debug_rl_in_rcu(fs_info, fmt, args...)                    \
3352 do {                                                                    \
3353         DEFINE_DYNAMIC_DEBUG_METADATA(descriptor, fmt);                 \
3354         if (unlikely(descriptor.flags & _DPRINTK_FLAGS_PRINT))          \
3355                 btrfs_printk_rl_in_rcu(fs_info, KERN_DEBUG fmt,         \
3356                                        ##args);\
3357 } while (0)
3358 #define btrfs_debug_rl(fs_info, fmt, args...)                           \
3359 do {                                                                    \
3360         DEFINE_DYNAMIC_DEBUG_METADATA(descriptor, fmt);                 \
3361         if (unlikely(descriptor.flags & _DPRINTK_FLAGS_PRINT))          \
3362                 btrfs_printk_ratelimited(fs_info, KERN_DEBUG fmt,       \
3363                                          ##args);                       \
3364 } while (0)
3365 #elif defined(DEBUG)
3366 #define btrfs_debug(fs_info, fmt, args...) \
3367         btrfs_printk(fs_info, KERN_DEBUG fmt, ##args)
3368 #define btrfs_debug_in_rcu(fs_info, fmt, args...) \
3369         btrfs_printk_in_rcu(fs_info, KERN_DEBUG fmt, ##args)
3370 #define btrfs_debug_rl_in_rcu(fs_info, fmt, args...) \
3371         btrfs_printk_rl_in_rcu(fs_info, KERN_DEBUG fmt, ##args)
3372 #define btrfs_debug_rl(fs_info, fmt, args...) \
3373         btrfs_printk_ratelimited(fs_info, KERN_DEBUG fmt, ##args)
3374 #else
3375 #define btrfs_debug(fs_info, fmt, args...) \
3376         btrfs_no_printk(fs_info, KERN_DEBUG fmt, ##args)
3377 #define btrfs_debug_in_rcu(fs_info, fmt, args...) \
3378         btrfs_no_printk_in_rcu(fs_info, KERN_DEBUG fmt, ##args)
3379 #define btrfs_debug_rl_in_rcu(fs_info, fmt, args...) \
3380         btrfs_no_printk_in_rcu(fs_info, KERN_DEBUG fmt, ##args)
3381 #define btrfs_debug_rl(fs_info, fmt, args...) \
3382         btrfs_no_printk(fs_info, KERN_DEBUG fmt, ##args)
3383 #endif
3384
3385 #define btrfs_printk_in_rcu(fs_info, fmt, args...)      \
3386 do {                                                    \
3387         rcu_read_lock();                                \
3388         btrfs_printk(fs_info, fmt, ##args);             \
3389         rcu_read_unlock();                              \
3390 } while (0)
3391
3392 #define btrfs_no_printk_in_rcu(fs_info, fmt, args...)   \
3393 do {                                                    \
3394         rcu_read_lock();                                \
3395         btrfs_no_printk(fs_info, fmt, ##args);          \
3396         rcu_read_unlock();                              \
3397 } while (0)
3398
3399 #define btrfs_printk_ratelimited(fs_info, fmt, args...)         \
3400 do {                                                            \
3401         static DEFINE_RATELIMIT_STATE(_rs,                      \
3402                 DEFAULT_RATELIMIT_INTERVAL,                     \
3403                 DEFAULT_RATELIMIT_BURST);                       \
3404         if (__ratelimit(&_rs))                                  \
3405                 btrfs_printk(fs_info, fmt, ##args);             \
3406 } while (0)
3407
3408 #define btrfs_printk_rl_in_rcu(fs_info, fmt, args...)           \
3409 do {                                                            \
3410         rcu_read_lock();                                        \
3411         btrfs_printk_ratelimited(fs_info, fmt, ##args);         \
3412         rcu_read_unlock();                                      \
3413 } while (0)
3414
3415 #ifdef CONFIG_BTRFS_ASSERT
3416
3417 __cold
3418 static inline void assfail(const char *expr, const char *file, int line)
3419 {
3420         pr_err("assertion failed: %s, file: %s, line: %d\n",
3421                expr, file, line);
3422         BUG();
3423 }
3424
3425 #define ASSERT(expr)    \
3426         (likely(expr) ? (void)0 : assfail(#expr, __FILE__, __LINE__))
3427 #else
3428 #define ASSERT(expr)    ((void)0)
3429 #endif
3430
3431 __cold
3432 static inline void btrfs_print_v0_err(struct btrfs_fs_info *fs_info)
3433 {
3434         btrfs_err(fs_info,
3435 "Unsupported V0 extent filesystem detected. Aborting. Please re-create your filesystem with a newer kernel");
3436 }
3437
3438 __printf(5, 6)
3439 __cold
3440 void __btrfs_handle_fs_error(struct btrfs_fs_info *fs_info, const char *function,
3441                      unsigned int line, int errno, const char *fmt, ...);
3442
3443 const char *btrfs_decode_error(int errno);
3444
3445 __cold
3446 void __btrfs_abort_transaction(struct btrfs_trans_handle *trans,
3447                                const char *function,
3448                                unsigned int line, int errno);
3449
3450 /*
3451  * Call btrfs_abort_transaction as early as possible when an error condition is
3452  * detected, that way the exact line number is reported.
3453  */
3454 #define btrfs_abort_transaction(trans, errno)           \
3455 do {                                                            \
3456         /* Report first abort since mount */                    \
3457         if (!test_and_set_bit(BTRFS_FS_STATE_TRANS_ABORTED,     \
3458                         &((trans)->fs_info->fs_state))) {       \
3459                 if ((errno) != -EIO) {                          \
3460                         WARN(1, KERN_DEBUG                              \
3461                         "BTRFS: Transaction aborted (error %d)\n",      \
3462                         (errno));                                       \
3463                 } else {                                                \
3464                         btrfs_debug((trans)->fs_info,                   \
3465                                     "Transaction aborted (error %d)", \
3466                                   (errno));                     \
3467                 }                                               \
3468         }                                                       \
3469         __btrfs_abort_transaction((trans), __func__,            \
3470                                   __LINE__, (errno));           \
3471 } while (0)
3472
3473 #define btrfs_handle_fs_error(fs_info, errno, fmt, args...)             \
3474 do {                                                            \
3475         __btrfs_handle_fs_error((fs_info), __func__, __LINE__,  \
3476                           (errno), fmt, ##args);                \
3477 } while (0)
3478
3479 __printf(5, 6)
3480 __cold
3481 void __btrfs_panic(struct btrfs_fs_info *fs_info, const char *function,
3482                    unsigned int line, int errno, const char *fmt, ...);
3483 /*
3484  * If BTRFS_MOUNT_PANIC_ON_FATAL_ERROR is in mount_opt, __btrfs_panic
3485  * will panic().  Otherwise we BUG() here.
3486  */
3487 #define btrfs_panic(fs_info, errno, fmt, args...)                       \
3488 do {                                                                    \
3489         __btrfs_panic(fs_info, __func__, __LINE__, errno, fmt, ##args); \
3490         BUG();                                                          \
3491 } while (0)
3492
3493
3494 /* compatibility and incompatibility defines */
3495
3496 #define btrfs_set_fs_incompat(__fs_info, opt) \
3497         __btrfs_set_fs_incompat((__fs_info), BTRFS_FEATURE_INCOMPAT_##opt)
3498
3499 static inline void __btrfs_set_fs_incompat(struct btrfs_fs_info *fs_info,
3500                                            u64 flag)
3501 {
3502         struct btrfs_super_block *disk_super;
3503         u64 features;
3504
3505         disk_super = fs_info->super_copy;
3506         features = btrfs_super_incompat_flags(disk_super);
3507         if (!(features & flag)) {
3508                 spin_lock(&fs_info->super_lock);
3509                 features = btrfs_super_incompat_flags(disk_super);
3510                 if (!(features & flag)) {
3511                         features |= flag;
3512                         btrfs_set_super_incompat_flags(disk_super, features);
3513                         btrfs_info(fs_info, "setting %llu feature flag",
3514                                          flag);
3515                 }
3516                 spin_unlock(&fs_info->super_lock);
3517         }
3518 }
3519
3520 #define btrfs_clear_fs_incompat(__fs_info, opt) \
3521         __btrfs_clear_fs_incompat((__fs_info), BTRFS_FEATURE_INCOMPAT_##opt)
3522
3523 static inline void __btrfs_clear_fs_incompat(struct btrfs_fs_info *fs_info,
3524                                              u64 flag)
3525 {
3526         struct btrfs_super_block *disk_super;
3527         u64 features;
3528
3529         disk_super = fs_info->super_copy;
3530         features = btrfs_super_incompat_flags(disk_super);
3531         if (features & flag) {
3532                 spin_lock(&fs_info->super_lock);
3533                 features = btrfs_super_incompat_flags(disk_super);
3534                 if (features & flag) {
3535                         features &= ~flag;
3536                         btrfs_set_super_incompat_flags(disk_super, features);
3537                         btrfs_info(fs_info, "clearing %llu feature flag",
3538                                          flag);
3539                 }
3540                 spin_unlock(&fs_info->super_lock);
3541         }
3542 }
3543
3544 #define btrfs_fs_incompat(fs_info, opt) \
3545         __btrfs_fs_incompat((fs_info), BTRFS_FEATURE_INCOMPAT_##opt)
3546
3547 static inline bool __btrfs_fs_incompat(struct btrfs_fs_info *fs_info, u64 flag)
3548 {
3549         struct btrfs_super_block *disk_super;
3550         disk_super = fs_info->super_copy;
3551         return !!(btrfs_super_incompat_flags(disk_super) & flag);
3552 }
3553
3554 #define btrfs_set_fs_compat_ro(__fs_info, opt) \
3555         __btrfs_set_fs_compat_ro((__fs_info), BTRFS_FEATURE_COMPAT_RO_##opt)
3556
3557 static inline void __btrfs_set_fs_compat_ro(struct btrfs_fs_info *fs_info,
3558                                             u64 flag)
3559 {
3560         struct btrfs_super_block *disk_super;
3561         u64 features;
3562
3563         disk_super = fs_info->super_copy;
3564         features = btrfs_super_compat_ro_flags(disk_super);
3565         if (!(features & flag)) {
3566                 spin_lock(&fs_info->super_lock);
3567                 features = btrfs_super_compat_ro_flags(disk_super);
3568                 if (!(features & flag)) {
3569                         features |= flag;
3570                         btrfs_set_super_compat_ro_flags(disk_super, features);
3571                         btrfs_info(fs_info, "setting %llu ro feature flag",
3572                                    flag);
3573                 }
3574                 spin_unlock(&fs_info->super_lock);
3575         }
3576 }
3577
3578 #define btrfs_clear_fs_compat_ro(__fs_info, opt) \
3579         __btrfs_clear_fs_compat_ro((__fs_info), BTRFS_FEATURE_COMPAT_RO_##opt)
3580
3581 static inline void __btrfs_clear_fs_compat_ro(struct btrfs_fs_info *fs_info,
3582                                               u64 flag)
3583 {
3584         struct btrfs_super_block *disk_super;
3585         u64 features;
3586
3587         disk_super = fs_info->super_copy;
3588         features = btrfs_super_compat_ro_flags(disk_super);
3589         if (features & flag) {
3590                 spin_lock(&fs_info->super_lock);
3591                 features = btrfs_super_compat_ro_flags(disk_super);
3592                 if (features & flag) {
3593                         features &= ~flag;
3594                         btrfs_set_super_compat_ro_flags(disk_super, features);
3595                         btrfs_info(fs_info, "clearing %llu ro feature flag",
3596                                    flag);
3597                 }
3598                 spin_unlock(&fs_info->super_lock);
3599         }
3600 }
3601
3602 #define btrfs_fs_compat_ro(fs_info, opt) \
3603         __btrfs_fs_compat_ro((fs_info), BTRFS_FEATURE_COMPAT_RO_##opt)
3604
3605 static inline int __btrfs_fs_compat_ro(struct btrfs_fs_info *fs_info, u64 flag)
3606 {
3607         struct btrfs_super_block *disk_super;
3608         disk_super = fs_info->super_copy;
3609         return !!(btrfs_super_compat_ro_flags(disk_super) & flag);
3610 }
3611
3612 /* acl.c */
3613 #ifdef CONFIG_BTRFS_FS_POSIX_ACL
3614 struct posix_acl *btrfs_get_acl(struct inode *inode, int type);
3615 int btrfs_set_acl(struct inode *inode, struct posix_acl *acl, int type);
3616 int btrfs_init_acl(struct btrfs_trans_handle *trans,
3617                    struct inode *inode, struct inode *dir);
3618 #else
3619 #define btrfs_get_acl NULL
3620 #define btrfs_set_acl NULL
3621 static inline int btrfs_init_acl(struct btrfs_trans_handle *trans,
3622                                  struct inode *inode, struct inode *dir)
3623 {
3624         return 0;
3625 }
3626 #endif
3627
3628 /* relocation.c */
3629 int btrfs_relocate_block_group(struct btrfs_fs_info *fs_info, u64 group_start);
3630 int btrfs_init_reloc_root(struct btrfs_trans_handle *trans,
3631                           struct btrfs_root *root);
3632 int btrfs_update_reloc_root(struct btrfs_trans_handle *trans,
3633                             struct btrfs_root *root);
3634 int btrfs_recover_relocation(struct btrfs_root *root);
3635 int btrfs_reloc_clone_csums(struct inode *inode, u64 file_pos, u64 len);
3636 int btrfs_reloc_cow_block(struct btrfs_trans_handle *trans,
3637                           struct btrfs_root *root, struct extent_buffer *buf,
3638                           struct extent_buffer *cow);
3639 void btrfs_reloc_pre_snapshot(struct btrfs_pending_snapshot *pending,
3640                               u64 *bytes_to_reserve);
3641 int btrfs_reloc_post_snapshot(struct btrfs_trans_handle *trans,
3642                               struct btrfs_pending_snapshot *pending);
3643
3644 /* scrub.c */
3645 int btrfs_scrub_dev(struct btrfs_fs_info *fs_info, u64 devid, u64 start,
3646                     u64 end, struct btrfs_scrub_progress *progress,
3647                     int readonly, int is_dev_replace);
3648 void btrfs_scrub_pause(struct btrfs_fs_info *fs_info);
3649 void btrfs_scrub_continue(struct btrfs_fs_info *fs_info);
3650 int btrfs_scrub_cancel(struct btrfs_fs_info *info);
3651 int btrfs_scrub_cancel_dev(struct btrfs_fs_info *info,
3652                            struct btrfs_device *dev);
3653 int btrfs_scrub_progress(struct btrfs_fs_info *fs_info, u64 devid,
3654                          struct btrfs_scrub_progress *progress);
3655 static inline void btrfs_init_full_stripe_locks_tree(
3656                         struct btrfs_full_stripe_locks_tree *locks_root)
3657 {
3658         locks_root->root = RB_ROOT;
3659         mutex_init(&locks_root->lock);
3660 }
3661
3662 /* dev-replace.c */
3663 void btrfs_bio_counter_inc_blocked(struct btrfs_fs_info *fs_info);
3664 void btrfs_bio_counter_inc_noblocked(struct btrfs_fs_info *fs_info);
3665 void btrfs_bio_counter_sub(struct btrfs_fs_info *fs_info, s64 amount);
3666
3667 static inline void btrfs_bio_counter_dec(struct btrfs_fs_info *fs_info)
3668 {
3669         btrfs_bio_counter_sub(fs_info, 1);
3670 }
3671
3672 /* reada.c */
3673 struct reada_control {
3674         struct btrfs_fs_info    *fs_info;               /* tree to prefetch */
3675         struct btrfs_key        key_start;
3676         struct btrfs_key        key_end;        /* exclusive */
3677         atomic_t                elems;
3678         struct kref             refcnt;
3679         wait_queue_head_t       wait;
3680 };
3681 struct reada_control *btrfs_reada_add(struct btrfs_root *root,
3682                               struct btrfs_key *start, struct btrfs_key *end);
3683 int btrfs_reada_wait(void *handle);
3684 void btrfs_reada_detach(void *handle);
3685 int btree_readahead_hook(struct extent_buffer *eb, int err);
3686
3687 static inline int is_fstree(u64 rootid)
3688 {
3689         if (rootid == BTRFS_FS_TREE_OBJECTID ||
3690             ((s64)rootid >= (s64)BTRFS_FIRST_FREE_OBJECTID &&
3691               !btrfs_qgroup_level(rootid)))
3692                 return 1;
3693         return 0;
3694 }
3695
3696 static inline int btrfs_defrag_cancelled(struct btrfs_fs_info *fs_info)
3697 {
3698         return signal_pending(current);
3699 }
3700
3701 /* Sanity test specific functions */
3702 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
3703 void btrfs_test_inode_set_ops(struct inode *inode);
3704 void btrfs_test_destroy_inode(struct inode *inode);
3705
3706 static inline int btrfs_is_testing(struct btrfs_fs_info *fs_info)
3707 {
3708         return test_bit(BTRFS_FS_STATE_DUMMY_FS_INFO, &fs_info->fs_state);
3709 }
3710 #else
3711 static inline int btrfs_is_testing(struct btrfs_fs_info *fs_info)
3712 {
3713         return 0;
3714 }
3715 #endif
3716
3717 static inline void cond_wake_up(struct wait_queue_head *wq)
3718 {
3719         /*
3720          * This implies a full smp_mb barrier, see comments for
3721          * waitqueue_active why.
3722          */
3723         if (wq_has_sleeper(wq))
3724                 wake_up(wq);
3725 }
3726
3727 static inline void cond_wake_up_nomb(struct wait_queue_head *wq)
3728 {
3729         /*
3730          * Special case for conditional wakeup where the barrier required for
3731          * waitqueue_active is implied by some of the preceding code. Eg. one
3732          * of such atomic operations (atomic_dec_and_return, ...), or a
3733          * unlock/lock sequence, etc.
3734          */
3735         if (waitqueue_active(wq))
3736                 wake_up(wq);
3737 }
3738
3739 #endif