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 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
  45 #define STATIC noinline
  46 #else
  47 #define STATIC static noinline
  48 #endif
  49
  50 #define BTRFS_MAGIC 0x4D5F53665248425FULL /* ascii _BHRfS_M, no null */
  51
  52 #define BTRFS_MAX_MIRRORS 3
  53
  54 #define BTRFS_MAX_LEVEL 8
  55
  56 #define BTRFS_OLDEST_GENERATION 0ULL
  57
  58 #define BTRFS_COMPAT_EXTENT_TREE_V0
  59
  60 /*
  61  * the max metadata block size.  This limit is somewhat artificial,
  62  * but the memmove costs go through the roof for larger blocks.
  63  */
  64 #define BTRFS_MAX_METADATA_BLOCKSIZE 65536
  65
  66 /*
  67  * we can actually store much bigger names, but lets not confuse the rest
  68  * of linux
  69  */
  70 #define BTRFS_NAME_LEN 255
  71
  72 /*
  73  * Theoretical limit is larger, but we keep this down to a sane
  74  * value. That should limit greatly the possibility of collisions on
  75  * inode ref items.
  76  */
  77 #define BTRFS_LINK_MAX 65535U
  78
  79 /* four bytes for CRC32 */
  80 static const int btrfs_csum_sizes[] = { 4 };
  81
  82 #define BTRFS_EMPTY_DIR_SIZE 0
  83
  84 /* ioprio of readahead is set to idle */
  85 #define BTRFS_IOPRIO_READA (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_IDLE, 0))
  86
  87 #define BTRFS_DIRTY_METADATA_THRESH     SZ_32M
  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         u64 time_started;       /* seconds since 1-Jan-1970 */
 346         u64 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         pid_t lock_owner;
 363         atomic_t nesting_level;
 364         struct mutex lock_finishing_cancel_unmount;
 365         rwlock_t lock;
 366         atomic_t read_locks;
 367         atomic_t blocking_readers;
 368         wait_queue_head_t read_lock_wq;
 369
 370         struct btrfs_scrub_progress scrub_progress;
 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 percpu_counter bio_counter;
1094         wait_queue_head_t replace_wait;
1095
1096         struct semaphore uuid_tree_rescan_sem;
1097
1098         /* Used to reclaim the metadata space in the background. */
1099         struct work_struct async_reclaim_work;
1100
1101         spinlock_t unused_bgs_lock;
1102         struct list_head unused_bgs;
1103         struct mutex unused_bg_unpin_mutex;
1104         struct mutex delete_unused_bgs_mutex;
1105
1106         /* For btrfs to record security options */
1107         struct security_mnt_opts security_opts;
1108
1109         /*
1110          * Chunks that can't be freed yet (under a trim/discard operation)
1111          * and will be latter freed. Protected by fs_info->chunk_mutex.
1112          */
1113         struct list_head pinned_chunks;
1114
1115         /* Cached block sizes */
1116         u32 nodesize;
1117         u32 sectorsize;
1118         u32 stripesize;
1119
1120 #ifdef CONFIG_BTRFS_FS_REF_VERIFY
1121         spinlock_t ref_verify_lock;
1122         struct rb_root block_tree;
1123 #endif
1124 };
1125
1126 static inline struct btrfs_fs_info *btrfs_sb(struct super_block *sb)
1127 {
1128         return sb->s_fs_info;
1129 }
1130
1131 struct btrfs_subvolume_writers {
1132         struct percpu_counter   counter;
1133         wait_queue_head_t       wait;
1134 };
1135
1136 /*
1137  * The state of btrfs root
1138  */
1139 /*
1140  * btrfs_record_root_in_trans is a multi-step process,
1141  * and it can race with the balancing code.   But the
1142  * race is very small, and only the first time the root
1143  * is added to each transaction.  So IN_TRANS_SETUP
1144  * is used to tell us when more checks are required
1145  */
1146 #define BTRFS_ROOT_IN_TRANS_SETUP       0
1147 #define BTRFS_ROOT_REF_COWS             1
1148 #define BTRFS_ROOT_TRACK_DIRTY          2
1149 #define BTRFS_ROOT_IN_RADIX             3
1150 #define BTRFS_ROOT_ORPHAN_ITEM_INSERTED 4
1151 #define BTRFS_ROOT_DEFRAG_RUNNING       5
1152 #define BTRFS_ROOT_FORCE_COW            6
1153 #define BTRFS_ROOT_MULTI_LOG_TASKS      7
1154 #define BTRFS_ROOT_DIRTY                8
1155
1156 /*
1157  * in ram representation of the tree.  extent_root is used for all allocations
1158  * and for the extent tree extent_root root.
1159  */
1160 struct btrfs_root {
1161         struct extent_buffer *node;
1162
1163         struct extent_buffer *commit_root;
1164         struct btrfs_root *log_root;
1165         struct btrfs_root *reloc_root;
1166
1167         unsigned long state;
1168         struct btrfs_root_item root_item;
1169         struct btrfs_key root_key;
1170         struct btrfs_fs_info *fs_info;
1171         struct extent_io_tree dirty_log_pages;
1172
1173         struct mutex objectid_mutex;
1174
1175         spinlock_t accounting_lock;
1176         struct btrfs_block_rsv *block_rsv;
1177
1178         /* free ino cache stuff */
1179         struct btrfs_free_space_ctl *free_ino_ctl;
1180         enum btrfs_caching_type ino_cache_state;
1181         spinlock_t ino_cache_lock;
1182         wait_queue_head_t ino_cache_wait;
1183         struct btrfs_free_space_ctl *free_ino_pinned;
1184         u64 ino_cache_progress;
1185         struct inode *ino_cache_inode;
1186
1187         struct mutex log_mutex;
1188         wait_queue_head_t log_writer_wait;
1189         wait_queue_head_t log_commit_wait[2];
1190         struct list_head log_ctxs[2];
1191         atomic_t log_writers;
1192         atomic_t log_commit[2];
1193         atomic_t log_batch;
1194         int log_transid;
1195         /* No matter the commit succeeds or not*/
1196         int log_transid_committed;
1197         /* Just be updated when the commit succeeds. */
1198         int last_log_commit;
1199         pid_t log_start_pid;
1200
1201         u64 objectid;
1202         u64 last_trans;
1203
1204         u32 type;
1205
1206         u64 highest_objectid;
1207
1208 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
1209         /* only used with CONFIG_BTRFS_FS_RUN_SANITY_TESTS is enabled */
1210         u64 alloc_bytenr;
1211 #endif
1212
1213         u64 defrag_trans_start;
1214         struct btrfs_key defrag_progress;
1215         struct btrfs_key defrag_max;
1216         char *name;
1217
1218         /* the dirty list is only used by non-reference counted roots */
1219         struct list_head dirty_list;
1220
1221         struct list_head root_list;
1222
1223         spinlock_t log_extents_lock[2];
1224         struct list_head logged_list[2];
1225
1226         int orphan_cleanup_state;
1227
1228         spinlock_t inode_lock;
1229         /* red-black tree that keeps track of in-memory inodes */
1230         struct rb_root inode_tree;
1231
1232         /*
1233          * radix tree that keeps track of delayed nodes of every inode,
1234          * protected by inode_lock
1235          */
1236         struct radix_tree_root delayed_nodes_tree;
1237         /*
1238          * right now this just gets used so that a root has its own devid
1239          * for stat.  It may be used for more later
1240          */
1241         dev_t anon_dev;
1242
1243         spinlock_t root_item_lock;
1244         refcount_t refs;
1245
1246         struct mutex delalloc_mutex;
1247         spinlock_t delalloc_lock;
1248         /*
1249          * all of the inodes that have delalloc bytes.  It is possible for
1250          * this list to be empty even when there is still dirty data=ordered
1251          * extents waiting to finish IO.
1252          */
1253         struct list_head delalloc_inodes;
1254         struct list_head delalloc_root;
1255         u64 nr_delalloc_inodes;
1256
1257         struct mutex ordered_extent_mutex;
1258         /*
1259          * this is used by the balancing code to wait for all the pending
1260          * ordered extents
1261          */
1262         spinlock_t ordered_extent_lock;
1263
1264         /*
1265          * all of the data=ordered extents pending writeback
1266          * these can span multiple transactions and basically include
1267          * every dirty data page that isn't from nodatacow
1268          */
1269         struct list_head ordered_extents;
1270         struct list_head ordered_root;
1271         u64 nr_ordered_extents;
1272
1273         /*
1274          * Number of currently running SEND ioctls to prevent
1275          * manipulation with the read-only status via SUBVOL_SETFLAGS
1276          */
1277         int send_in_progress;
1278         struct btrfs_subvolume_writers *subv_writers;
1279         atomic_t will_be_snapshotted;
1280
1281         /* For qgroup metadata reserved space */
1282         spinlock_t qgroup_meta_rsv_lock;
1283         u64 qgroup_meta_rsv_pertrans;
1284         u64 qgroup_meta_rsv_prealloc;
1285 };
1286
1287 struct btrfs_file_private {
1288         void *filldir_buf;
1289 };
1290
1291 static inline u32 btrfs_inode_sectorsize(const struct inode *inode)
1292 {
1293         return btrfs_sb(inode->i_sb)->sectorsize;
1294 }
1295
1296 static inline u32 BTRFS_LEAF_DATA_SIZE(const struct btrfs_fs_info *info)
1297 {
1298
1299         return info->nodesize - sizeof(struct btrfs_header);
1300 }
1301
1302 #define BTRFS_LEAF_DATA_OFFSET          offsetof(struct btrfs_leaf, items)
1303
1304 static inline u32 BTRFS_MAX_ITEM_SIZE(const struct btrfs_fs_info *info)
1305 {
1306         return BTRFS_LEAF_DATA_SIZE(info) - sizeof(struct btrfs_item);
1307 }
1308
1309 static inline u32 BTRFS_NODEPTRS_PER_BLOCK(const struct btrfs_fs_info *info)
1310 {
1311         return BTRFS_LEAF_DATA_SIZE(info) / sizeof(struct btrfs_key_ptr);
1312 }
1313
1314 #define BTRFS_FILE_EXTENT_INLINE_DATA_START             \
1315                 (offsetof(struct btrfs_file_extent_item, disk_bytenr))
1316 static inline u32 BTRFS_MAX_INLINE_DATA_SIZE(const struct btrfs_fs_info *info)
1317 {
1318         return BTRFS_MAX_ITEM_SIZE(info) -
1319                BTRFS_FILE_EXTENT_INLINE_DATA_START;
1320 }
1321
1322 static inline u32 BTRFS_MAX_XATTR_SIZE(const struct btrfs_fs_info *info)
1323 {
1324         return BTRFS_MAX_ITEM_SIZE(info) - sizeof(struct btrfs_dir_item);
1325 }
1326
1327 /*
1328  * Flags for mount options.
1329  *
1330  * Note: don't forget to add new options to btrfs_show_options()
1331  */
1332 #define BTRFS_MOUNT_NODATASUM           (1 << 0)
1333 #define BTRFS_MOUNT_NODATACOW           (1 << 1)
1334 #define BTRFS_MOUNT_NOBARRIER           (1 << 2)
1335 #define BTRFS_MOUNT_SSD                 (1 << 3)
1336 #define BTRFS_MOUNT_DEGRADED            (1 << 4)
1337 #define BTRFS_MOUNT_COMPRESS            (1 << 5)
1338 #define BTRFS_MOUNT_NOTREELOG           (1 << 6)
1339 #define BTRFS_MOUNT_FLUSHONCOMMIT       (1 << 7)
1340 #define BTRFS_MOUNT_SSD_SPREAD          (1 << 8)
1341 #define BTRFS_MOUNT_NOSSD               (1 << 9)
1342 #define BTRFS_MOUNT_DISCARD             (1 << 10)
1343 #define BTRFS_MOUNT_FORCE_COMPRESS      (1 << 11)
1344 #define BTRFS_MOUNT_SPACE_CACHE         (1 << 12)
1345 #define BTRFS_MOUNT_CLEAR_CACHE         (1 << 13)
1346 #define BTRFS_MOUNT_USER_SUBVOL_RM_ALLOWED (1 << 14)
1347 #define BTRFS_MOUNT_ENOSPC_DEBUG         (1 << 15)
1348 #define BTRFS_MOUNT_AUTO_DEFRAG         (1 << 16)
1349 #define BTRFS_MOUNT_INODE_MAP_CACHE     (1 << 17)
1350 #define BTRFS_MOUNT_USEBACKUPROOT       (1 << 18)
1351 #define BTRFS_MOUNT_SKIP_BALANCE        (1 << 19)
1352 #define BTRFS_MOUNT_CHECK_INTEGRITY     (1 << 20)
1353 #define BTRFS_MOUNT_CHECK_INTEGRITY_INCLUDING_EXTENT_DATA (1 << 21)
1354 #define BTRFS_MOUNT_PANIC_ON_FATAL_ERROR        (1 << 22)
1355 #define BTRFS_MOUNT_RESCAN_UUID_TREE    (1 << 23)
1356 #define BTRFS_MOUNT_FRAGMENT_DATA       (1 << 24)
1357 #define BTRFS_MOUNT_FRAGMENT_METADATA   (1 << 25)
1358 #define BTRFS_MOUNT_FREE_SPACE_TREE     (1 << 26)
1359 #define BTRFS_MOUNT_NOLOGREPLAY         (1 << 27)
1360 #define BTRFS_MOUNT_REF_VERIFY          (1 << 28)
1361
1362 #define BTRFS_DEFAULT_COMMIT_INTERVAL   (30)
1363 #define BTRFS_DEFAULT_MAX_INLINE        (2048)
1364
1365 #define btrfs_clear_opt(o, opt)         ((o) &= ~BTRFS_MOUNT_##opt)
1366 #define btrfs_set_opt(o, opt)           ((o) |= BTRFS_MOUNT_##opt)
1367 #define btrfs_raw_test_opt(o, opt)      ((o) & BTRFS_MOUNT_##opt)
1368 #define btrfs_test_opt(fs_info, opt)    ((fs_info)->mount_opt & \
1369                                          BTRFS_MOUNT_##opt)
1370
1371 #define btrfs_set_and_info(fs_info, opt, fmt, args...)                  \
1372 {                                                                       \
1373         if (!btrfs_test_opt(fs_info, opt))                              \
1374                 btrfs_info(fs_info, fmt, ##args);                       \
1375         btrfs_set_opt(fs_info->mount_opt, opt);                         \
1376 }
1377
1378 #define btrfs_clear_and_info(fs_info, opt, fmt, args...)                \
1379 {                                                                       \
1380         if (btrfs_test_opt(fs_info, opt))                               \
1381                 btrfs_info(fs_info, fmt, ##args);                       \
1382         btrfs_clear_opt(fs_info->mount_opt, opt);                       \
1383 }
1384
1385 #ifdef CONFIG_BTRFS_DEBUG
1386 static inline int
1387 btrfs_should_fragment_free_space(struct btrfs_block_group_cache *block_group)
1388 {
1389         struct btrfs_fs_info *fs_info = block_group->fs_info;
1390
1391         return (btrfs_test_opt(fs_info, FRAGMENT_METADATA) &&
1392                 block_group->flags & BTRFS_BLOCK_GROUP_METADATA) ||
1393                (btrfs_test_opt(fs_info, FRAGMENT_DATA) &&
1394                 block_group->flags &  BTRFS_BLOCK_GROUP_DATA);
1395 }
1396 #endif
1397
1398 /*
1399  * Requests for changes that need to be done during transaction commit.
1400  *
1401  * Internal mount options that are used for special handling of the real
1402  * mount options (eg. cannot be set during remount and have to be set during
1403  * transaction commit)
1404  */
1405
1406 #define BTRFS_PENDING_SET_INODE_MAP_CACHE       (0)
1407 #define BTRFS_PENDING_CLEAR_INODE_MAP_CACHE     (1)
1408 #define BTRFS_PENDING_COMMIT                    (2)
1409
1410 #define btrfs_test_pending(info, opt)   \
1411         test_bit(BTRFS_PENDING_##opt, &(info)->pending_changes)
1412 #define btrfs_set_pending(info, opt)    \
1413         set_bit(BTRFS_PENDING_##opt, &(info)->pending_changes)
1414 #define btrfs_clear_pending(info, opt)  \
1415         clear_bit(BTRFS_PENDING_##opt, &(info)->pending_changes)
1416
1417 /*
1418  * Helpers for setting pending mount option changes.
1419  *
1420  * Expects corresponding macros
1421  * BTRFS_PENDING_SET_ and CLEAR_ + short mount option name
1422  */
1423 #define btrfs_set_pending_and_info(info, opt, fmt, args...)            \
1424 do {                                                                   \
1425        if (!btrfs_raw_test_opt((info)->mount_opt, opt)) {              \
1426                btrfs_info((info), fmt, ##args);                        \
1427                btrfs_set_pending((info), SET_##opt);                   \
1428                btrfs_clear_pending((info), CLEAR_##opt);               \
1429        }                                                               \
1430 } while(0)
1431
1432 #define btrfs_clear_pending_and_info(info, opt, fmt, args...)          \
1433 do {                                                                   \
1434        if (btrfs_raw_test_opt((info)->mount_opt, opt)) {               \
1435                btrfs_info((info), fmt, ##args);                        \
1436                btrfs_set_pending((info), CLEAR_##opt);                 \
1437                btrfs_clear_pending((info), SET_##opt);                 \
1438        }                                                               \
1439 } while(0)
1440
1441 /*
1442  * Inode flags
1443  */
1444 #define BTRFS_INODE_NODATASUM           (1 << 0)
1445 #define BTRFS_INODE_NODATACOW           (1 << 1)
1446 #define BTRFS_INODE_READONLY            (1 << 2)
1447 #define BTRFS_INODE_NOCOMPRESS          (1 << 3)
1448 #define BTRFS_INODE_PREALLOC            (1 << 4)
1449 #define BTRFS_INODE_SYNC                (1 << 5)
1450 #define BTRFS_INODE_IMMUTABLE           (1 << 6)
1451 #define BTRFS_INODE_APPEND              (1 << 7)
1452 #define BTRFS_INODE_NODUMP              (1 << 8)
1453 #define BTRFS_INODE_NOATIME             (1 << 9)
1454 #define BTRFS_INODE_DIRSYNC             (1 << 10)
1455 #define BTRFS_INODE_COMPRESS            (1 << 11)
1456
1457 #define BTRFS_INODE_ROOT_ITEM_INIT      (1 << 31)
1458
1459 struct btrfs_map_token {
1460         const struct extent_buffer *eb;
1461         char *kaddr;
1462         unsigned long offset;
1463 };
1464
1465 #define BTRFS_BYTES_TO_BLKS(fs_info, bytes) \
1466                                 ((bytes) >> (fs_info)->sb->s_blocksize_bits)
1467
1468 static inline void btrfs_init_map_token (struct btrfs_map_token *token)
1469 {
1470         token->kaddr = NULL;
1471 }
1472
1473 /* some macros to generate set/get functions for the struct fields.  This
1474  * assumes there is a lefoo_to_cpu for every type, so lets make a simple
1475  * one for u8:
1476  */
1477 #define le8_to_cpu(v) (v)
1478 #define cpu_to_le8(v) (v)
1479 #define __le8 u8
1480
1481 #define read_eb_member(eb, ptr, type, member, result) (\
1482         read_extent_buffer(eb, (char *)(result),                        \
1483                            ((unsigned long)(ptr)) +                     \
1484                             offsetof(type, member),                     \
1485                            sizeof(((type *)0)->member)))
1486
1487 #define write_eb_member(eb, ptr, type, member, result) (\
1488         write_extent_buffer(eb, (char *)(result),                       \
1489                            ((unsigned long)(ptr)) +                     \
1490                             offsetof(type, member),                     \
1491                            sizeof(((type *)0)->member)))
1492
1493 #define DECLARE_BTRFS_SETGET_BITS(bits)                                 \
1494 u##bits btrfs_get_token_##bits(const struct extent_buffer *eb,          \
1495                                const void *ptr, unsigned long off,      \
1496                                struct btrfs_map_token *token);          \
1497 void btrfs_set_token_##bits(struct extent_buffer *eb, const void *ptr,  \
1498                             unsigned long off, u##bits val,             \
1499                             struct btrfs_map_token *token);             \
1500 static inline u##bits btrfs_get_##bits(const struct extent_buffer *eb,  \
1501                                        const void *ptr,                 \
1502                                        unsigned long off)               \
1503 {                                                                       \
1504         return btrfs_get_token_##bits(eb, ptr, off, NULL);              \
1505 }                                                                       \
1506 static inline void btrfs_set_##bits(struct extent_buffer *eb, void *ptr,\
1507                                     unsigned long off, u##bits val)     \
1508 {                                                                       \
1509        btrfs_set_token_##bits(eb, ptr, off, val, NULL);                 \
1510 }
1511
1512 DECLARE_BTRFS_SETGET_BITS(8)
1513 DECLARE_BTRFS_SETGET_BITS(16)
1514 DECLARE_BTRFS_SETGET_BITS(32)
1515 DECLARE_BTRFS_SETGET_BITS(64)
1516
1517 #define BTRFS_SETGET_FUNCS(name, type, member, bits)                    \
1518 static inline u##bits btrfs_##name(const struct extent_buffer *eb,      \
1519                                    const type *s)                       \
1520 {                                                                       \
1521         BUILD_BUG_ON(sizeof(u##bits) != sizeof(((type *)0))->member);   \
1522         return btrfs_get_##bits(eb, s, offsetof(type, member));         \
1523 }                                                                       \
1524 static inline void btrfs_set_##name(struct extent_buffer *eb, type *s,  \
1525                                     u##bits val)                        \
1526 {                                                                       \
1527         BUILD_BUG_ON(sizeof(u##bits) != sizeof(((type *)0))->member);   \
1528         btrfs_set_##bits(eb, s, offsetof(type, member), val);           \
1529 }                                                                       \
1530 static inline u##bits btrfs_token_##name(const struct extent_buffer *eb,\
1531                                          const type *s,                 \
1532                                          struct btrfs_map_token *token) \
1533 {                                                                       \
1534         BUILD_BUG_ON(sizeof(u##bits) != sizeof(((type *)0))->member);   \
1535         return btrfs_get_token_##bits(eb, s, offsetof(type, member), token); \
1536 }                                                                       \
1537 static inline void btrfs_set_token_##name(struct extent_buffer *eb,     \
1538                                           type *s, u##bits val,         \
1539                                          struct btrfs_map_token *token) \
1540 {                                                                       \
1541         BUILD_BUG_ON(sizeof(u##bits) != sizeof(((type *)0))->member);   \
1542         btrfs_set_token_##bits(eb, s, offsetof(type, member), val, token); \
1543 }
1544
1545 #define BTRFS_SETGET_HEADER_FUNCS(name, type, member, bits)             \
1546 static inline u##bits btrfs_##name(const struct extent_buffer *eb)      \
1547 {                                                                       \
1548         const type *p = page_address(eb->pages[0]);                     \
1549         u##bits res = le##bits##_to_cpu(p->member);                     \
1550         return res;                                                     \
1551 }                                                                       \
1552 static inline void btrfs_set_##name(struct extent_buffer *eb,           \
1553                                     u##bits val)                        \
1554 {                                                                       \
1555         type *p = page_address(eb->pages[0]);                           \
1556         p->member = cpu_to_le##bits(val);                               \
1557 }
1558
1559 #define BTRFS_SETGET_STACK_FUNCS(name, type, member, bits)              \
1560 static inline u##bits btrfs_##name(const type *s)                       \
1561 {                                                                       \
1562         return le##bits##_to_cpu(s->member);                            \
1563 }                                                                       \
1564 static inline void btrfs_set_##name(type *s, u##bits val)               \
1565 {                                                                       \
1566         s->member = cpu_to_le##bits(val);                               \
1567 }
1568
1569
1570 static inline u64 btrfs_device_total_bytes(struct extent_buffer *eb,
1571                                            struct btrfs_dev_item *s)
1572 {
1573         BUILD_BUG_ON(sizeof(u64) !=
1574                      sizeof(((struct btrfs_dev_item *)0))->total_bytes);
1575         return btrfs_get_64(eb, s, offsetof(struct btrfs_dev_item,
1576                                             total_bytes));
1577 }
1578 static inline void btrfs_set_device_total_bytes(struct extent_buffer *eb,
1579                                                 struct btrfs_dev_item *s,
1580                                                 u64 val)
1581 {
1582         BUILD_BUG_ON(sizeof(u64) !=
1583                      sizeof(((struct btrfs_dev_item *)0))->total_bytes);
1584         WARN_ON(!IS_ALIGNED(val, eb->fs_info->sectorsize));
1585         btrfs_set_64(eb, s, offsetof(struct btrfs_dev_item, total_bytes), val);
1586 }
1587
1588
1589 BTRFS_SETGET_FUNCS(device_type, struct btrfs_dev_item, type, 64);
1590 BTRFS_SETGET_FUNCS(device_bytes_used, struct btrfs_dev_item, bytes_used, 64);
1591 BTRFS_SETGET_FUNCS(device_io_align, struct btrfs_dev_item, io_align, 32);
1592 BTRFS_SETGET_FUNCS(device_io_width, struct btrfs_dev_item, io_width, 32);
1593 BTRFS_SETGET_FUNCS(device_start_offset, struct btrfs_dev_item,
1594                    start_offset, 64);
1595 BTRFS_SETGET_FUNCS(device_sector_size, struct btrfs_dev_item, sector_size, 32);
1596 BTRFS_SETGET_FUNCS(device_id, struct btrfs_dev_item, devid, 64);
1597 BTRFS_SETGET_FUNCS(device_group, struct btrfs_dev_item, dev_group, 32);
1598 BTRFS_SETGET_FUNCS(device_seek_speed, struct btrfs_dev_item, seek_speed, 8);
1599 BTRFS_SETGET_FUNCS(device_bandwidth, struct btrfs_dev_item, bandwidth, 8);
1600 BTRFS_SETGET_FUNCS(device_generation, struct btrfs_dev_item, generation, 64);
1601
1602 BTRFS_SETGET_STACK_FUNCS(stack_device_type, struct btrfs_dev_item, type, 64);
1603 BTRFS_SETGET_STACK_FUNCS(stack_device_total_bytes, struct btrfs_dev_item,
1604                          total_bytes, 64);
1605 BTRFS_SETGET_STACK_FUNCS(stack_device_bytes_used, struct btrfs_dev_item,
1606                          bytes_used, 64);
1607 BTRFS_SETGET_STACK_FUNCS(stack_device_io_align, struct btrfs_dev_item,
1608                          io_align, 32);
1609 BTRFS_SETGET_STACK_FUNCS(stack_device_io_width, struct btrfs_dev_item,
1610                          io_width, 32);
1611 BTRFS_SETGET_STACK_FUNCS(stack_device_sector_size, struct btrfs_dev_item,
1612                          sector_size, 32);
1613 BTRFS_SETGET_STACK_FUNCS(stack_device_id, struct btrfs_dev_item, devid, 64);
1614 BTRFS_SETGET_STACK_FUNCS(stack_device_group, struct btrfs_dev_item,
1615                          dev_group, 32);
1616 BTRFS_SETGET_STACK_FUNCS(stack_device_seek_speed, struct btrfs_dev_item,
1617                          seek_speed, 8);
1618 BTRFS_SETGET_STACK_FUNCS(stack_device_bandwidth, struct btrfs_dev_item,
1619                          bandwidth, 8);
1620 BTRFS_SETGET_STACK_FUNCS(stack_device_generation, struct btrfs_dev_item,
1621                          generation, 64);
1622
1623 static inline unsigned long btrfs_device_uuid(struct btrfs_dev_item *d)
1624 {
1625         return (unsigned long)d + offsetof(struct btrfs_dev_item, uuid);
1626 }
1627
1628 static inline unsigned long btrfs_device_fsid(struct btrfs_dev_item *d)
1629 {
1630         return (unsigned long)d + offsetof(struct btrfs_dev_item, fsid);
1631 }
1632
1633 BTRFS_SETGET_FUNCS(chunk_length, struct btrfs_chunk, length, 64);
1634 BTRFS_SETGET_FUNCS(chunk_owner, struct btrfs_chunk, owner, 64);
1635 BTRFS_SETGET_FUNCS(chunk_stripe_len, struct btrfs_chunk, stripe_len, 64);
1636 BTRFS_SETGET_FUNCS(chunk_io_align, struct btrfs_chunk, io_align, 32);
1637 BTRFS_SETGET_FUNCS(chunk_io_width, struct btrfs_chunk, io_width, 32);
1638 BTRFS_SETGET_FUNCS(chunk_sector_size, struct btrfs_chunk, sector_size, 32);
1639 BTRFS_SETGET_FUNCS(chunk_type, struct btrfs_chunk, type, 64);
1640 BTRFS_SETGET_FUNCS(chunk_num_stripes, struct btrfs_chunk, num_stripes, 16);
1641 BTRFS_SETGET_FUNCS(chunk_sub_stripes, struct btrfs_chunk, sub_stripes, 16);
1642 BTRFS_SETGET_FUNCS(stripe_devid, struct btrfs_stripe, devid, 64);
1643 BTRFS_SETGET_FUNCS(stripe_offset, struct btrfs_stripe, offset, 64);
1644
1645 static inline char *btrfs_stripe_dev_uuid(struct btrfs_stripe *s)
1646 {
1647         return (char *)s + offsetof(struct btrfs_stripe, dev_uuid);
1648 }
1649
1650 BTRFS_SETGET_STACK_FUNCS(stack_chunk_length, struct btrfs_chunk, length, 64);
1651 BTRFS_SETGET_STACK_FUNCS(stack_chunk_owner, struct btrfs_chunk, owner, 64);
1652 BTRFS_SETGET_STACK_FUNCS(stack_chunk_stripe_len, struct btrfs_chunk,
1653                          stripe_len, 64);
1654 BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_align, struct btrfs_chunk,
1655                          io_align, 32);
1656 BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_width, struct btrfs_chunk,
1657                          io_width, 32);
1658 BTRFS_SETGET_STACK_FUNCS(stack_chunk_sector_size, struct btrfs_chunk,
1659                          sector_size, 32);
1660 BTRFS_SETGET_STACK_FUNCS(stack_chunk_type, struct btrfs_chunk, type, 64);
1661 BTRFS_SETGET_STACK_FUNCS(stack_chunk_num_stripes, struct btrfs_chunk,
1662                          num_stripes, 16);
1663 BTRFS_SETGET_STACK_FUNCS(stack_chunk_sub_stripes, struct btrfs_chunk,
1664                          sub_stripes, 16);
1665 BTRFS_SETGET_STACK_FUNCS(stack_stripe_devid, struct btrfs_stripe, devid, 64);
1666 BTRFS_SETGET_STACK_FUNCS(stack_stripe_offset, struct btrfs_stripe, offset, 64);
1667
1668 static inline struct btrfs_stripe *btrfs_stripe_nr(struct btrfs_chunk *c,
1669                                                    int nr)
1670 {
1671         unsigned long offset = (unsigned long)c;
1672         offset += offsetof(struct btrfs_chunk, stripe);
1673         offset += nr * sizeof(struct btrfs_stripe);
1674         return (struct btrfs_stripe *)offset;
1675 }
1676
1677 static inline char *btrfs_stripe_dev_uuid_nr(struct btrfs_chunk *c, int nr)
1678 {
1679         return btrfs_stripe_dev_uuid(btrfs_stripe_nr(c, nr));
1680 }
1681
1682 static inline u64 btrfs_stripe_offset_nr(struct extent_buffer *eb,
1683                                          struct btrfs_chunk *c, int nr)
1684 {
1685         return btrfs_stripe_offset(eb, btrfs_stripe_nr(c, nr));
1686 }
1687
1688 static inline u64 btrfs_stripe_devid_nr(struct extent_buffer *eb,
1689                                          struct btrfs_chunk *c, int nr)
1690 {
1691         return btrfs_stripe_devid(eb, btrfs_stripe_nr(c, nr));
1692 }
1693
1694 /* struct btrfs_block_group_item */
1695 BTRFS_SETGET_STACK_FUNCS(block_group_used, struct btrfs_block_group_item,
1696                          used, 64);
1697 BTRFS_SETGET_FUNCS(disk_block_group_used, struct btrfs_block_group_item,
1698                          used, 64);
1699 BTRFS_SETGET_STACK_FUNCS(block_group_chunk_objectid,
1700                         struct btrfs_block_group_item, chunk_objectid, 64);
1701
1702 BTRFS_SETGET_FUNCS(disk_block_group_chunk_objectid,
1703                    struct btrfs_block_group_item, chunk_objectid, 64);
1704 BTRFS_SETGET_FUNCS(disk_block_group_flags,
1705                    struct btrfs_block_group_item, flags, 64);
1706 BTRFS_SETGET_STACK_FUNCS(block_group_flags,
1707                         struct btrfs_block_group_item, flags, 64);
1708
1709 /* struct btrfs_free_space_info */
1710 BTRFS_SETGET_FUNCS(free_space_extent_count, struct btrfs_free_space_info,
1711                    extent_count, 32);
1712 BTRFS_SETGET_FUNCS(free_space_flags, struct btrfs_free_space_info, flags, 32);
1713
1714 /* struct btrfs_inode_ref */
1715 BTRFS_SETGET_FUNCS(inode_ref_name_len, struct btrfs_inode_ref, name_len, 16);
1716 BTRFS_SETGET_FUNCS(inode_ref_index, struct btrfs_inode_ref, index, 64);
1717
1718 /* struct btrfs_inode_extref */
1719 BTRFS_SETGET_FUNCS(inode_extref_parent, struct btrfs_inode_extref,
1720                    parent_objectid, 64);
1721 BTRFS_SETGET_FUNCS(inode_extref_name_len, struct btrfs_inode_extref,
1722                    name_len, 16);
1723 BTRFS_SETGET_FUNCS(inode_extref_index, struct btrfs_inode_extref, index, 64);
1724
1725 /* struct btrfs_inode_item */
1726 BTRFS_SETGET_FUNCS(inode_generation, struct btrfs_inode_item, generation, 64);
1727 BTRFS_SETGET_FUNCS(inode_sequence, struct btrfs_inode_item, sequence, 64);
1728 BTRFS_SETGET_FUNCS(inode_transid, struct btrfs_inode_item, transid, 64);
1729 BTRFS_SETGET_FUNCS(inode_size, struct btrfs_inode_item, size, 64);
1730 BTRFS_SETGET_FUNCS(inode_nbytes, struct btrfs_inode_item, nbytes, 64);
1731 BTRFS_SETGET_FUNCS(inode_block_group, struct btrfs_inode_item, block_group, 64);
1732 BTRFS_SETGET_FUNCS(inode_nlink, struct btrfs_inode_item, nlink, 32);
1733 BTRFS_SETGET_FUNCS(inode_uid, struct btrfs_inode_item, uid, 32);
1734 BTRFS_SETGET_FUNCS(inode_gid, struct btrfs_inode_item, gid, 32);
1735 BTRFS_SETGET_FUNCS(inode_mode, struct btrfs_inode_item, mode, 32);
1736 BTRFS_SETGET_FUNCS(inode_rdev, struct btrfs_inode_item, rdev, 64);
1737 BTRFS_SETGET_FUNCS(inode_flags, struct btrfs_inode_item, flags, 64);
1738 BTRFS_SETGET_STACK_FUNCS(stack_inode_generation, struct btrfs_inode_item,
1739                          generation, 64);
1740 BTRFS_SETGET_STACK_FUNCS(stack_inode_sequence, struct btrfs_inode_item,
1741                          sequence, 64);
1742 BTRFS_SETGET_STACK_FUNCS(stack_inode_transid, struct btrfs_inode_item,
1743                          transid, 64);
1744 BTRFS_SETGET_STACK_FUNCS(stack_inode_size, struct btrfs_inode_item, size, 64);
1745 BTRFS_SETGET_STACK_FUNCS(stack_inode_nbytes, struct btrfs_inode_item,
1746                          nbytes, 64);
1747 BTRFS_SETGET_STACK_FUNCS(stack_inode_block_group, struct btrfs_inode_item,
1748                          block_group, 64);
1749 BTRFS_SETGET_STACK_FUNCS(stack_inode_nlink, struct btrfs_inode_item, nlink, 32);
1750 BTRFS_SETGET_STACK_FUNCS(stack_inode_uid, struct btrfs_inode_item, uid, 32);
1751 BTRFS_SETGET_STACK_FUNCS(stack_inode_gid, struct btrfs_inode_item, gid, 32);
1752 BTRFS_SETGET_STACK_FUNCS(stack_inode_mode, struct btrfs_inode_item, mode, 32);
1753 BTRFS_SETGET_STACK_FUNCS(stack_inode_rdev, struct btrfs_inode_item, rdev, 64);
1754 BTRFS_SETGET_STACK_FUNCS(stack_inode_flags, struct btrfs_inode_item, flags, 64);
1755 BTRFS_SETGET_FUNCS(timespec_sec, struct btrfs_timespec, sec, 64);
1756 BTRFS_SETGET_FUNCS(timespec_nsec, struct btrfs_timespec, nsec, 32);
1757 BTRFS_SETGET_STACK_FUNCS(stack_timespec_sec, struct btrfs_timespec, sec, 64);
1758 BTRFS_SETGET_STACK_FUNCS(stack_timespec_nsec, struct btrfs_timespec, nsec, 32);
1759
1760 /* struct btrfs_dev_extent */
1761 BTRFS_SETGET_FUNCS(dev_extent_chunk_tree, struct btrfs_dev_extent,
1762                    chunk_tree, 64);
1763 BTRFS_SETGET_FUNCS(dev_extent_chunk_objectid, struct btrfs_dev_extent,
1764                    chunk_objectid, 64);
1765 BTRFS_SETGET_FUNCS(dev_extent_chunk_offset, struct btrfs_dev_extent,
1766                    chunk_offset, 64);
1767 BTRFS_SETGET_FUNCS(dev_extent_length, struct btrfs_dev_extent, length, 64);
1768
1769 static inline unsigned long btrfs_dev_extent_chunk_tree_uuid(struct btrfs_dev_extent *dev)
1770 {
1771         unsigned long ptr = offsetof(struct btrfs_dev_extent, chunk_tree_uuid);
1772         return (unsigned long)dev + ptr;
1773 }
1774
1775 BTRFS_SETGET_FUNCS(extent_refs, struct btrfs_extent_item, refs, 64);
1776 BTRFS_SETGET_FUNCS(extent_generation, struct btrfs_extent_item,
1777                    generation, 64);
1778 BTRFS_SETGET_FUNCS(extent_flags, struct btrfs_extent_item, flags, 64);
1779
1780 BTRFS_SETGET_FUNCS(extent_refs_v0, struct btrfs_extent_item_v0, refs, 32);
1781
1782
1783 BTRFS_SETGET_FUNCS(tree_block_level, struct btrfs_tree_block_info, level, 8);
1784
1785 static inline void btrfs_tree_block_key(struct extent_buffer *eb,
1786                                         struct btrfs_tree_block_info *item,
1787                                         struct btrfs_disk_key *key)
1788 {
1789         read_eb_member(eb, item, struct btrfs_tree_block_info, key, key);
1790 }
1791
1792 static inline void btrfs_set_tree_block_key(struct extent_buffer *eb,
1793                                             struct btrfs_tree_block_info *item,
1794                                             struct btrfs_disk_key *key)
1795 {
1796         write_eb_member(eb, item, struct btrfs_tree_block_info, key, key);
1797 }
1798
1799 BTRFS_SETGET_FUNCS(extent_data_ref_root, struct btrfs_extent_data_ref,
1800                    root, 64);
1801 BTRFS_SETGET_FUNCS(extent_data_ref_objectid, struct btrfs_extent_data_ref,
1802                    objectid, 64);
1803 BTRFS_SETGET_FUNCS(extent_data_ref_offset, struct btrfs_extent_data_ref,
1804                    offset, 64);
1805 BTRFS_SETGET_FUNCS(extent_data_ref_count, struct btrfs_extent_data_ref,
1806                    count, 32);
1807
1808 BTRFS_SETGET_FUNCS(shared_data_ref_count, struct btrfs_shared_data_ref,
1809                    count, 32);
1810
1811 BTRFS_SETGET_FUNCS(extent_inline_ref_type, struct btrfs_extent_inline_ref,
1812                    type, 8);
1813 BTRFS_SETGET_FUNCS(extent_inline_ref_offset, struct btrfs_extent_inline_ref,
1814                    offset, 64);
1815
1816 static inline u32 btrfs_extent_inline_ref_size(int type)
1817 {
1818         if (type == BTRFS_TREE_BLOCK_REF_KEY ||
1819             type == BTRFS_SHARED_BLOCK_REF_KEY)
1820                 return sizeof(struct btrfs_extent_inline_ref);
1821         if (type == BTRFS_SHARED_DATA_REF_KEY)
1822                 return sizeof(struct btrfs_shared_data_ref) +
1823                        sizeof(struct btrfs_extent_inline_ref);
1824         if (type == BTRFS_EXTENT_DATA_REF_KEY)
1825                 return sizeof(struct btrfs_extent_data_ref) +
1826                        offsetof(struct btrfs_extent_inline_ref, offset);
1827         return 0;
1828 }
1829
1830 BTRFS_SETGET_FUNCS(ref_root_v0, struct btrfs_extent_ref_v0, root, 64);
1831 BTRFS_SETGET_FUNCS(ref_generation_v0, struct btrfs_extent_ref_v0,
1832                    generation, 64);
1833 BTRFS_SETGET_FUNCS(ref_objectid_v0, struct btrfs_extent_ref_v0, objectid, 64);
1834 BTRFS_SETGET_FUNCS(ref_count_v0, struct btrfs_extent_ref_v0, count, 32);
1835
1836 /* struct btrfs_node */
1837 BTRFS_SETGET_FUNCS(key_blockptr, struct btrfs_key_ptr, blockptr, 64);
1838 BTRFS_SETGET_FUNCS(key_generation, struct btrfs_key_ptr, generation, 64);
1839 BTRFS_SETGET_STACK_FUNCS(stack_key_blockptr, struct btrfs_key_ptr,
1840                          blockptr, 64);
1841 BTRFS_SETGET_STACK_FUNCS(stack_key_generation, struct btrfs_key_ptr,
1842                          generation, 64);
1843
1844 static inline u64 btrfs_node_blockptr(struct extent_buffer *eb, int nr)
1845 {
1846         unsigned long ptr;
1847         ptr = offsetof(struct btrfs_node, ptrs) +
1848                 sizeof(struct btrfs_key_ptr) * nr;
1849         return btrfs_key_blockptr(eb, (struct btrfs_key_ptr *)ptr);
1850 }
1851
1852 static inline void btrfs_set_node_blockptr(struct extent_buffer *eb,
1853                                            int nr, u64 val)
1854 {
1855         unsigned long ptr;
1856         ptr = offsetof(struct btrfs_node, ptrs) +
1857                 sizeof(struct btrfs_key_ptr) * nr;
1858         btrfs_set_key_blockptr(eb, (struct btrfs_key_ptr *)ptr, val);
1859 }
1860
1861 static inline u64 btrfs_node_ptr_generation(struct extent_buffer *eb, int nr)
1862 {
1863         unsigned long ptr;
1864         ptr = offsetof(struct btrfs_node, ptrs) +
1865                 sizeof(struct btrfs_key_ptr) * nr;
1866         return btrfs_key_generation(eb, (struct btrfs_key_ptr *)ptr);
1867 }
1868
1869 static inline void btrfs_set_node_ptr_generation(struct extent_buffer *eb,
1870                                                  int nr, u64 val)
1871 {
1872         unsigned long ptr;
1873         ptr = offsetof(struct btrfs_node, ptrs) +
1874                 sizeof(struct btrfs_key_ptr) * nr;
1875         btrfs_set_key_generation(eb, (struct btrfs_key_ptr *)ptr, val);
1876 }
1877
1878 static inline unsigned long btrfs_node_key_ptr_offset(int nr)
1879 {
1880         return offsetof(struct btrfs_node, ptrs) +
1881                 sizeof(struct btrfs_key_ptr) * nr;
1882 }
1883
1884 void btrfs_node_key(const struct extent_buffer *eb,
1885                     struct btrfs_disk_key *disk_key, int nr);
1886
1887 static inline void btrfs_set_node_key(struct extent_buffer *eb,
1888                                       struct btrfs_disk_key *disk_key, int nr)
1889 {
1890         unsigned long ptr;
1891         ptr = btrfs_node_key_ptr_offset(nr);
1892         write_eb_member(eb, (struct btrfs_key_ptr *)ptr,
1893                        struct btrfs_key_ptr, key, disk_key);
1894 }
1895
1896 /* struct btrfs_item */
1897 BTRFS_SETGET_FUNCS(item_offset, struct btrfs_item, offset, 32);
1898 BTRFS_SETGET_FUNCS(item_size, struct btrfs_item, size, 32);
1899 BTRFS_SETGET_STACK_FUNCS(stack_item_offset, struct btrfs_item, offset, 32);
1900 BTRFS_SETGET_STACK_FUNCS(stack_item_size, struct btrfs_item, size, 32);
1901
1902 static inline unsigned long btrfs_item_nr_offset(int nr)
1903 {
1904         return offsetof(struct btrfs_leaf, items) +
1905                 sizeof(struct btrfs_item) * nr;
1906 }
1907
1908 static inline struct btrfs_item *btrfs_item_nr(int nr)
1909 {
1910         return (struct btrfs_item *)btrfs_item_nr_offset(nr);
1911 }
1912
1913 static inline u32 btrfs_item_end(const struct extent_buffer *eb,
1914                                  struct btrfs_item *item)
1915 {
1916         return btrfs_item_offset(eb, item) + btrfs_item_size(eb, item);
1917 }
1918
1919 static inline u32 btrfs_item_end_nr(const struct extent_buffer *eb, int nr)
1920 {
1921         return btrfs_item_end(eb, btrfs_item_nr(nr));
1922 }
1923
1924 static inline u32 btrfs_item_offset_nr(const struct extent_buffer *eb, int nr)
1925 {
1926         return btrfs_item_offset(eb, btrfs_item_nr(nr));
1927 }
1928
1929 static inline u32 btrfs_item_size_nr(const struct extent_buffer *eb, int nr)
1930 {
1931         return btrfs_item_size(eb, btrfs_item_nr(nr));
1932 }
1933
1934 static inline void btrfs_item_key(const struct extent_buffer *eb,
1935                            struct btrfs_disk_key *disk_key, int nr)
1936 {
1937         struct btrfs_item *item = btrfs_item_nr(nr);
1938         read_eb_member(eb, item, struct btrfs_item, key, disk_key);
1939 }
1940
1941 static inline void btrfs_set_item_key(struct extent_buffer *eb,
1942                                struct btrfs_disk_key *disk_key, int nr)
1943 {
1944         struct btrfs_item *item = btrfs_item_nr(nr);
1945         write_eb_member(eb, item, struct btrfs_item, key, disk_key);
1946 }
1947
1948 BTRFS_SETGET_FUNCS(dir_log_end, struct btrfs_dir_log_item, end, 64);
1949
1950 /*
1951  * struct btrfs_root_ref
1952  */
1953 BTRFS_SETGET_FUNCS(root_ref_dirid, struct btrfs_root_ref, dirid, 64);
1954 BTRFS_SETGET_FUNCS(root_ref_sequence, struct btrfs_root_ref, sequence, 64);
1955 BTRFS_SETGET_FUNCS(root_ref_name_len, struct btrfs_root_ref, name_len, 16);
1956
1957 /* struct btrfs_dir_item */
1958 BTRFS_SETGET_FUNCS(dir_data_len, struct btrfs_dir_item, data_len, 16);
1959 BTRFS_SETGET_FUNCS(dir_type, struct btrfs_dir_item, type, 8);
1960 BTRFS_SETGET_FUNCS(dir_name_len, struct btrfs_dir_item, name_len, 16);
1961 BTRFS_SETGET_FUNCS(dir_transid, struct btrfs_dir_item, transid, 64);
1962 BTRFS_SETGET_STACK_FUNCS(stack_dir_type, struct btrfs_dir_item, type, 8);
1963 BTRFS_SETGET_STACK_FUNCS(stack_dir_data_len, struct btrfs_dir_item,
1964                          data_len, 16);
1965 BTRFS_SETGET_STACK_FUNCS(stack_dir_name_len, struct btrfs_dir_item,
1966                          name_len, 16);
1967 BTRFS_SETGET_STACK_FUNCS(stack_dir_transid, struct btrfs_dir_item,
1968                          transid, 64);
1969
1970 static inline void btrfs_dir_item_key(const struct extent_buffer *eb,
1971                                       const struct btrfs_dir_item *item,
1972                                       struct btrfs_disk_key *key)
1973 {
1974         read_eb_member(eb, item, struct btrfs_dir_item, location, key);
1975 }
1976
1977 static inline void btrfs_set_dir_item_key(struct extent_buffer *eb,
1978                                           struct btrfs_dir_item *item,
1979                                           const struct btrfs_disk_key *key)
1980 {
1981         write_eb_member(eb, item, struct btrfs_dir_item, location, key);
1982 }
1983
1984 BTRFS_SETGET_FUNCS(free_space_entries, struct btrfs_free_space_header,
1985                    num_entries, 64);
1986 BTRFS_SETGET_FUNCS(free_space_bitmaps, struct btrfs_free_space_header,
1987                    num_bitmaps, 64);
1988 BTRFS_SETGET_FUNCS(free_space_generation, struct btrfs_free_space_header,
1989                    generation, 64);
1990
1991 static inline void btrfs_free_space_key(const struct extent_buffer *eb,
1992                                         const struct btrfs_free_space_header *h,
1993                                         struct btrfs_disk_key *key)
1994 {
1995         read_eb_member(eb, h, struct btrfs_free_space_header, location, key);
1996 }
1997
1998 static inline void btrfs_set_free_space_key(struct extent_buffer *eb,
1999                                             struct btrfs_free_space_header *h,
2000                                             const struct btrfs_disk_key *key)
2001 {
2002         write_eb_member(eb, h, struct btrfs_free_space_header, location, key);
2003 }
2004
2005 /* struct btrfs_disk_key */
2006 BTRFS_SETGET_STACK_FUNCS(disk_key_objectid, struct btrfs_disk_key,
2007                          objectid, 64);
2008 BTRFS_SETGET_STACK_FUNCS(disk_key_offset, struct btrfs_disk_key, offset, 64);
2009 BTRFS_SETGET_STACK_FUNCS(disk_key_type, struct btrfs_disk_key, type, 8);
2010
2011 static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu,
2012                                          const struct btrfs_disk_key *disk)
2013 {
2014         cpu->offset = le64_to_cpu(disk->offset);
2015         cpu->type = disk->type;
2016         cpu->objectid = le64_to_cpu(disk->objectid);
2017 }
2018
2019 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk,
2020                                          const struct btrfs_key *cpu)
2021 {
2022         disk->offset = cpu_to_le64(cpu->offset);
2023         disk->type = cpu->type;
2024         disk->objectid = cpu_to_le64(cpu->objectid);
2025 }
2026
2027 static inline void btrfs_node_key_to_cpu(const struct extent_buffer *eb,
2028                                          struct btrfs_key *key, int nr)
2029 {
2030         struct btrfs_disk_key disk_key;
2031         btrfs_node_key(eb, &disk_key, nr);
2032         btrfs_disk_key_to_cpu(key, &disk_key);
2033 }
2034
2035 static inline void btrfs_item_key_to_cpu(const struct extent_buffer *eb,
2036                                          struct btrfs_key *key, int nr)
2037 {
2038         struct btrfs_disk_key disk_key;
2039         btrfs_item_key(eb, &disk_key, nr);
2040         btrfs_disk_key_to_cpu(key, &disk_key);
2041 }
2042
2043 static inline void btrfs_dir_item_key_to_cpu(const struct extent_buffer *eb,
2044                                              const struct btrfs_dir_item *item,
2045                                              struct btrfs_key *key)
2046 {
2047         struct btrfs_disk_key disk_key;
2048         btrfs_dir_item_key(eb, item, &disk_key);
2049         btrfs_disk_key_to_cpu(key, &disk_key);
2050 }
2051
2052 static inline u8 btrfs_key_type(const struct btrfs_key *key)
2053 {
2054         return key->type;
2055 }
2056
2057 static inline void btrfs_set_key_type(struct btrfs_key *key, u8 val)
2058 {
2059         key->type = val;
2060 }
2061
2062 /* struct btrfs_header */
2063 BTRFS_SETGET_HEADER_FUNCS(header_bytenr, struct btrfs_header, bytenr, 64);
2064 BTRFS_SETGET_HEADER_FUNCS(header_generation, struct btrfs_header,
2065                           generation, 64);
2066 BTRFS_SETGET_HEADER_FUNCS(header_owner, struct btrfs_header, owner, 64);
2067 BTRFS_SETGET_HEADER_FUNCS(header_nritems, struct btrfs_header, nritems, 32);
2068 BTRFS_SETGET_HEADER_FUNCS(header_flags, struct btrfs_header, flags, 64);
2069 BTRFS_SETGET_HEADER_FUNCS(header_level, struct btrfs_header, level, 8);
2070 BTRFS_SETGET_STACK_FUNCS(stack_header_generation, struct btrfs_header,
2071                          generation, 64);
2072 BTRFS_SETGET_STACK_FUNCS(stack_header_owner, struct btrfs_header, owner, 64);
2073 BTRFS_SETGET_STACK_FUNCS(stack_header_nritems, struct btrfs_header,
2074                          nritems, 32);
2075 BTRFS_SETGET_STACK_FUNCS(stack_header_bytenr, struct btrfs_header, bytenr, 64);
2076
2077 static inline int btrfs_header_flag(const struct extent_buffer *eb, u64 flag)
2078 {
2079         return (btrfs_header_flags(eb) & flag) == flag;
2080 }
2081
2082 static inline int btrfs_set_header_flag(struct extent_buffer *eb, u64 flag)
2083 {
2084         u64 flags = btrfs_header_flags(eb);
2085         btrfs_set_header_flags(eb, flags | flag);
2086         return (flags & flag) == flag;
2087 }
2088
2089 static inline int btrfs_clear_header_flag(struct extent_buffer *eb, u64 flag)
2090 {
2091         u64 flags = btrfs_header_flags(eb);
2092         btrfs_set_header_flags(eb, flags & ~flag);
2093         return (flags & flag) == flag;
2094 }
2095
2096 static inline int btrfs_header_backref_rev(const struct extent_buffer *eb)
2097 {
2098         u64 flags = btrfs_header_flags(eb);
2099         return flags >> BTRFS_BACKREF_REV_SHIFT;
2100 }
2101
2102 static inline void btrfs_set_header_backref_rev(struct extent_buffer *eb,
2103                                                 int rev)
2104 {
2105         u64 flags = btrfs_header_flags(eb);
2106         flags &= ~BTRFS_BACKREF_REV_MASK;
2107         flags |= (u64)rev << BTRFS_BACKREF_REV_SHIFT;
2108         btrfs_set_header_flags(eb, flags);
2109 }
2110
2111 static inline unsigned long btrfs_header_fsid(void)
2112 {
2113         return offsetof(struct btrfs_header, fsid);
2114 }
2115
2116 static inline unsigned long btrfs_header_chunk_tree_uuid(const struct extent_buffer *eb)
2117 {
2118         return offsetof(struct btrfs_header, chunk_tree_uuid);
2119 }
2120
2121 static inline int btrfs_is_leaf(const struct extent_buffer *eb)
2122 {
2123         return btrfs_header_level(eb) == 0;
2124 }
2125
2126 /* struct btrfs_root_item */
2127 BTRFS_SETGET_FUNCS(disk_root_generation, struct btrfs_root_item,
2128                    generation, 64);
2129 BTRFS_SETGET_FUNCS(disk_root_refs, struct btrfs_root_item, refs, 32);
2130 BTRFS_SETGET_FUNCS(disk_root_bytenr, struct btrfs_root_item, bytenr, 64);
2131 BTRFS_SETGET_FUNCS(disk_root_level, struct btrfs_root_item, level, 8);
2132
2133 BTRFS_SETGET_STACK_FUNCS(root_generation, struct btrfs_root_item,
2134                          generation, 64);
2135 BTRFS_SETGET_STACK_FUNCS(root_bytenr, struct btrfs_root_item, bytenr, 64);
2136 BTRFS_SETGET_STACK_FUNCS(root_level, struct btrfs_root_item, level, 8);
2137 BTRFS_SETGET_STACK_FUNCS(root_dirid, struct btrfs_root_item, root_dirid, 64);
2138 BTRFS_SETGET_STACK_FUNCS(root_refs, struct btrfs_root_item, refs, 32);
2139 BTRFS_SETGET_STACK_FUNCS(root_flags, struct btrfs_root_item, flags, 64);
2140 BTRFS_SETGET_STACK_FUNCS(root_used, struct btrfs_root_item, bytes_used, 64);
2141 BTRFS_SETGET_STACK_FUNCS(root_limit, struct btrfs_root_item, byte_limit, 64);
2142 BTRFS_SETGET_STACK_FUNCS(root_last_snapshot, struct btrfs_root_item,
2143                          last_snapshot, 64);
2144 BTRFS_SETGET_STACK_FUNCS(root_generation_v2, struct btrfs_root_item,
2145                          generation_v2, 64);
2146 BTRFS_SETGET_STACK_FUNCS(root_ctransid, struct btrfs_root_item,
2147                          ctransid, 64);
2148 BTRFS_SETGET_STACK_FUNCS(root_otransid, struct btrfs_root_item,
2149                          otransid, 64);
2150 BTRFS_SETGET_STACK_FUNCS(root_stransid, struct btrfs_root_item,
2151                          stransid, 64);
2152 BTRFS_SETGET_STACK_FUNCS(root_rtransid, struct btrfs_root_item,
2153                          rtransid, 64);
2154
2155 static inline bool btrfs_root_readonly(const struct btrfs_root *root)
2156 {
2157         return (root->root_item.flags & cpu_to_le64(BTRFS_ROOT_SUBVOL_RDONLY)) != 0;
2158 }
2159
2160 static inline bool btrfs_root_dead(const struct btrfs_root *root)
2161 {
2162         return (root->root_item.flags & cpu_to_le64(BTRFS_ROOT_SUBVOL_DEAD)) != 0;
2163 }
2164
2165 /* struct btrfs_root_backup */
2166 BTRFS_SETGET_STACK_FUNCS(backup_tree_root, struct btrfs_root_backup,
2167                    tree_root, 64);
2168 BTRFS_SETGET_STACK_FUNCS(backup_tree_root_gen, struct btrfs_root_backup,
2169                    tree_root_gen, 64);
2170 BTRFS_SETGET_STACK_FUNCS(backup_tree_root_level, struct btrfs_root_backup,
2171                    tree_root_level, 8);
2172
2173 BTRFS_SETGET_STACK_FUNCS(backup_chunk_root, struct btrfs_root_backup,
2174                    chunk_root, 64);
2175 BTRFS_SETGET_STACK_FUNCS(backup_chunk_root_gen, struct btrfs_root_backup,
2176                    chunk_root_gen, 64);
2177 BTRFS_SETGET_STACK_FUNCS(backup_chunk_root_level, struct btrfs_root_backup,
2178                    chunk_root_level, 8);
2179
2180 BTRFS_SETGET_STACK_FUNCS(backup_extent_root, struct btrfs_root_backup,
2181                    extent_root, 64);
2182 BTRFS_SETGET_STACK_FUNCS(backup_extent_root_gen, struct btrfs_root_backup,
2183                    extent_root_gen, 64);
2184 BTRFS_SETGET_STACK_FUNCS(backup_extent_root_level, struct btrfs_root_backup,
2185                    extent_root_level, 8);
2186
2187 BTRFS_SETGET_STACK_FUNCS(backup_fs_root, struct btrfs_root_backup,
2188                    fs_root, 64);
2189 BTRFS_SETGET_STACK_FUNCS(backup_fs_root_gen, struct btrfs_root_backup,
2190                    fs_root_gen, 64);
2191 BTRFS_SETGET_STACK_FUNCS(backup_fs_root_level, struct btrfs_root_backup,
2192                    fs_root_level, 8);
2193
2194 BTRFS_SETGET_STACK_FUNCS(backup_dev_root, struct btrfs_root_backup,
2195                    dev_root, 64);
2196 BTRFS_SETGET_STACK_FUNCS(backup_dev_root_gen, struct btrfs_root_backup,
2197                    dev_root_gen, 64);
2198 BTRFS_SETGET_STACK_FUNCS(backup_dev_root_level, struct btrfs_root_backup,
2199                    dev_root_level, 8);
2200
2201 BTRFS_SETGET_STACK_FUNCS(backup_csum_root, struct btrfs_root_backup,
2202                    csum_root, 64);
2203 BTRFS_SETGET_STACK_FUNCS(backup_csum_root_gen, struct btrfs_root_backup,
2204                    csum_root_gen, 64);
2205 BTRFS_SETGET_STACK_FUNCS(backup_csum_root_level, struct btrfs_root_backup,
2206                    csum_root_level, 8);
2207 BTRFS_SETGET_STACK_FUNCS(backup_total_bytes, struct btrfs_root_backup,
2208                    total_bytes, 64);
2209 BTRFS_SETGET_STACK_FUNCS(backup_bytes_used, struct btrfs_root_backup,
2210                    bytes_used, 64);
2211 BTRFS_SETGET_STACK_FUNCS(backup_num_devices, struct btrfs_root_backup,
2212                    num_devices, 64);
2213
2214 /* struct btrfs_balance_item */
2215 BTRFS_SETGET_FUNCS(balance_flags, struct btrfs_balance_item, flags, 64);
2216
2217 static inline void btrfs_balance_data(const struct extent_buffer *eb,
2218                                       const struct btrfs_balance_item *bi,
2219                                       struct btrfs_disk_balance_args *ba)
2220 {
2221         read_eb_member(eb, bi, struct btrfs_balance_item, data, ba);
2222 }
2223
2224 static inline void btrfs_set_balance_data(struct extent_buffer *eb,
2225                                   struct btrfs_balance_item *bi,
2226                                   const struct btrfs_disk_balance_args *ba)
2227 {
2228         write_eb_member(eb, bi, struct btrfs_balance_item, data, ba);
2229 }
2230
2231 static inline void btrfs_balance_meta(const struct extent_buffer *eb,
2232                                       const struct btrfs_balance_item *bi,
2233                                       struct btrfs_disk_balance_args *ba)
2234 {
2235         read_eb_member(eb, bi, struct btrfs_balance_item, meta, ba);
2236 }
2237
2238 static inline void btrfs_set_balance_meta(struct extent_buffer *eb,
2239                                   struct btrfs_balance_item *bi,
2240                                   const struct btrfs_disk_balance_args *ba)
2241 {
2242         write_eb_member(eb, bi, struct btrfs_balance_item, meta, ba);
2243 }
2244
2245 static inline void btrfs_balance_sys(const struct extent_buffer *eb,
2246                                      const struct btrfs_balance_item *bi,
2247                                      struct btrfs_disk_balance_args *ba)
2248 {
2249         read_eb_member(eb, bi, struct btrfs_balance_item, sys, ba);
2250 }
2251
2252 static inline void btrfs_set_balance_sys(struct extent_buffer *eb,
2253                                  struct btrfs_balance_item *bi,
2254                                  const struct btrfs_disk_balance_args *ba)
2255 {
2256         write_eb_member(eb, bi, struct btrfs_balance_item, sys, ba);
2257 }
2258
2259 static inline void
2260 btrfs_disk_balance_args_to_cpu(struct btrfs_balance_args *cpu,
2261                                const struct btrfs_disk_balance_args *disk)
2262 {
2263         memset(cpu, 0, sizeof(*cpu));
2264
2265         cpu->profiles = le64_to_cpu(disk->profiles);
2266         cpu->usage = le64_to_cpu(disk->usage);
2267         cpu->devid = le64_to_cpu(disk->devid);
2268         cpu->pstart = le64_to_cpu(disk->pstart);
2269         cpu->pend = le64_to_cpu(disk->pend);
2270         cpu->vstart = le64_to_cpu(disk->vstart);
2271         cpu->vend = le64_to_cpu(disk->vend);
2272         cpu->target = le64_to_cpu(disk->target);
2273         cpu->flags = le64_to_cpu(disk->flags);
2274         cpu->limit = le64_to_cpu(disk->limit);
2275         cpu->stripes_min = le32_to_cpu(disk->stripes_min);
2276         cpu->stripes_max = le32_to_cpu(disk->stripes_max);
2277 }
2278
2279 static inline void
2280 btrfs_cpu_balance_args_to_disk(struct btrfs_disk_balance_args *disk,
2281                                const struct btrfs_balance_args *cpu)
2282 {
2283         memset(disk, 0, sizeof(*disk));
2284
2285         disk->profiles = cpu_to_le64(cpu->profiles);
2286         disk->usage = cpu_to_le64(cpu->usage);
2287         disk->devid = cpu_to_le64(cpu->devid);
2288         disk->pstart = cpu_to_le64(cpu->pstart);
2289         disk->pend = cpu_to_le64(cpu->pend);
2290         disk->vstart = cpu_to_le64(cpu->vstart);
2291         disk->vend = cpu_to_le64(cpu->vend);
2292         disk->target = cpu_to_le64(cpu->target);
2293         disk->flags = cpu_to_le64(cpu->flags);
2294         disk->limit = cpu_to_le64(cpu->limit);
2295         disk->stripes_min = cpu_to_le32(cpu->stripes_min);
2296         disk->stripes_max = cpu_to_le32(cpu->stripes_max);
2297 }
2298
2299 /* struct btrfs_super_block */
2300 BTRFS_SETGET_STACK_FUNCS(super_bytenr, struct btrfs_super_block, bytenr, 64);
2301 BTRFS_SETGET_STACK_FUNCS(super_flags, struct btrfs_super_block, flags, 64);
2302 BTRFS_SETGET_STACK_FUNCS(super_generation, struct btrfs_super_block,
2303                          generation, 64);
2304 BTRFS_SETGET_STACK_FUNCS(super_root, struct btrfs_super_block, root, 64);
2305 BTRFS_SETGET_STACK_FUNCS(super_sys_array_size,
2306                          struct btrfs_super_block, sys_chunk_array_size, 32);
2307 BTRFS_SETGET_STACK_FUNCS(super_chunk_root_generation,
2308                          struct btrfs_super_block, chunk_root_generation, 64);
2309 BTRFS_SETGET_STACK_FUNCS(super_root_level, struct btrfs_super_block,
2310                          root_level, 8);
2311 BTRFS_SETGET_STACK_FUNCS(super_chunk_root, struct btrfs_super_block,
2312                          chunk_root, 64);
2313 BTRFS_SETGET_STACK_FUNCS(super_chunk_root_level, struct btrfs_super_block,
2314                          chunk_root_level, 8);
2315 BTRFS_SETGET_STACK_FUNCS(super_log_root, struct btrfs_super_block,
2316                          log_root, 64);
2317 BTRFS_SETGET_STACK_FUNCS(super_log_root_transid, struct btrfs_super_block,
2318                          log_root_transid, 64);
2319 BTRFS_SETGET_STACK_FUNCS(super_log_root_level, struct btrfs_super_block,
2320                          log_root_level, 8);
2321 BTRFS_SETGET_STACK_FUNCS(super_total_bytes, struct btrfs_super_block,
2322                          total_bytes, 64);
2323 BTRFS_SETGET_STACK_FUNCS(super_bytes_used, struct btrfs_super_block,
2324                          bytes_used, 64);
2325 BTRFS_SETGET_STACK_FUNCS(super_sectorsize, struct btrfs_super_block,
2326                          sectorsize, 32);
2327 BTRFS_SETGET_STACK_FUNCS(super_nodesize, struct btrfs_super_block,
2328                          nodesize, 32);
2329 BTRFS_SETGET_STACK_FUNCS(super_stripesize, struct btrfs_super_block,
2330                          stripesize, 32);
2331 BTRFS_SETGET_STACK_FUNCS(super_root_dir, struct btrfs_super_block,
2332                          root_dir_objectid, 64);
2333 BTRFS_SETGET_STACK_FUNCS(super_num_devices, struct btrfs_super_block,
2334                          num_devices, 64);
2335 BTRFS_SETGET_STACK_FUNCS(super_compat_flags, struct btrfs_super_block,
2336                          compat_flags, 64);
2337 BTRFS_SETGET_STACK_FUNCS(super_compat_ro_flags, struct btrfs_super_block,
2338                          compat_ro_flags, 64);
2339 BTRFS_SETGET_STACK_FUNCS(super_incompat_flags, struct btrfs_super_block,
2340                          incompat_flags, 64);
2341 BTRFS_SETGET_STACK_FUNCS(super_csum_type, struct btrfs_super_block,
2342                          csum_type, 16);
2343 BTRFS_SETGET_STACK_FUNCS(super_cache_generation, struct btrfs_super_block,
2344                          cache_generation, 64);
2345 BTRFS_SETGET_STACK_FUNCS(super_magic, struct btrfs_super_block, magic, 64);
2346 BTRFS_SETGET_STACK_FUNCS(super_uuid_tree_generation, struct btrfs_super_block,
2347                          uuid_tree_generation, 64);
2348
2349 static inline int btrfs_super_csum_size(const struct btrfs_super_block *s)
2350 {
2351         u16 t = btrfs_super_csum_type(s);
2352         /*
2353          * csum type is validated at mount time
2354          */
2355         return btrfs_csum_sizes[t];
2356 }
2357
2358
2359 /*
2360  * The leaf data grows from end-to-front in the node.
2361  * this returns the address of the start of the last item,
2362  * which is the stop of the leaf data stack
2363  */
2364 static inline unsigned int leaf_data_end(const struct btrfs_fs_info *fs_info,
2365                                          const struct extent_buffer *leaf)
2366 {
2367         u32 nr = btrfs_header_nritems(leaf);
2368
2369         if (nr == 0)
2370                 return BTRFS_LEAF_DATA_SIZE(fs_info);
2371         return btrfs_item_offset_nr(leaf, nr - 1);
2372 }
2373
2374 /* struct btrfs_file_extent_item */
2375 BTRFS_SETGET_FUNCS(file_extent_type, struct btrfs_file_extent_item, type, 8);
2376 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_disk_bytenr,
2377                          struct btrfs_file_extent_item, disk_bytenr, 64);
2378 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_offset,
2379                          struct btrfs_file_extent_item, offset, 64);
2380 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_generation,
2381                          struct btrfs_file_extent_item, generation, 64);
2382 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_num_bytes,
2383                          struct btrfs_file_extent_item, num_bytes, 64);
2384 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_disk_num_bytes,
2385                          struct btrfs_file_extent_item, disk_num_bytes, 64);
2386 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_compression,
2387                          struct btrfs_file_extent_item, compression, 8);
2388
2389 static inline unsigned long
2390 btrfs_file_extent_inline_start(const struct btrfs_file_extent_item *e)
2391 {
2392         return (unsigned long)e + BTRFS_FILE_EXTENT_INLINE_DATA_START;
2393 }
2394
2395 static inline u32 btrfs_file_extent_calc_inline_size(u32 datasize)
2396 {
2397         return BTRFS_FILE_EXTENT_INLINE_DATA_START + datasize;
2398 }
2399
2400 BTRFS_SETGET_FUNCS(file_extent_disk_bytenr, struct btrfs_file_extent_item,
2401                    disk_bytenr, 64);
2402 BTRFS_SETGET_FUNCS(file_extent_generation, struct btrfs_file_extent_item,
2403                    generation, 64);
2404 BTRFS_SETGET_FUNCS(file_extent_disk_num_bytes, struct btrfs_file_extent_item,
2405                    disk_num_bytes, 64);
2406 BTRFS_SETGET_FUNCS(file_extent_offset, struct btrfs_file_extent_item,
2407                   offset, 64);
2408 BTRFS_SETGET_FUNCS(file_extent_num_bytes, struct btrfs_file_extent_item,
2409                    num_bytes, 64);
2410 BTRFS_SETGET_FUNCS(file_extent_ram_bytes, struct btrfs_file_extent_item,
2411                    ram_bytes, 64);
2412 BTRFS_SETGET_FUNCS(file_extent_compression, struct btrfs_file_extent_item,
2413                    compression, 8);
2414 BTRFS_SETGET_FUNCS(file_extent_encryption, struct btrfs_file_extent_item,
2415                    encryption, 8);
2416 BTRFS_SETGET_FUNCS(file_extent_other_encoding, struct btrfs_file_extent_item,
2417                    other_encoding, 16);
2418
2419 /*
2420  * this returns the number of bytes used by the item on disk, minus the
2421  * size of any extent headers.  If a file is compressed on disk, this is
2422  * the compressed size
2423  */
2424 static inline u32 btrfs_file_extent_inline_item_len(
2425                                                 const struct extent_buffer *eb,
2426                                                 struct btrfs_item *e)
2427 {
2428         return btrfs_item_size(eb, e) - BTRFS_FILE_EXTENT_INLINE_DATA_START;
2429 }
2430
2431 /* this returns the number of file bytes represented by the inline item.
2432  * If an item is compressed, this is the uncompressed size
2433  */
2434 static inline u32 btrfs_file_extent_inline_len(const struct extent_buffer *eb,
2435                                         int slot,
2436                                         const struct btrfs_file_extent_item *fi)
2437 {
2438         struct btrfs_map_token token;
2439
2440         btrfs_init_map_token(&token);
2441         /*
2442          * return the space used on disk if this item isn't
2443          * compressed or encoded
2444          */
2445         if (btrfs_token_file_extent_compression(eb, fi, &token) == 0 &&
2446             btrfs_token_file_extent_encryption(eb, fi, &token) == 0 &&
2447             btrfs_token_file_extent_other_encoding(eb, fi, &token) == 0) {
2448                 return btrfs_file_extent_inline_item_len(eb,
2449                                                          btrfs_item_nr(slot));
2450         }
2451
2452         /* otherwise use the ram bytes field */
2453         return btrfs_token_file_extent_ram_bytes(eb, fi, &token);
2454 }
2455
2456
2457 /* btrfs_dev_stats_item */
2458 static inline u64 btrfs_dev_stats_value(const struct extent_buffer *eb,
2459                                         const struct btrfs_dev_stats_item *ptr,
2460                                         int index)
2461 {
2462         u64 val;
2463
2464         read_extent_buffer(eb, &val,
2465                            offsetof(struct btrfs_dev_stats_item, values) +
2466                             ((unsigned long)ptr) + (index * sizeof(u64)),
2467                            sizeof(val));
2468         return val;
2469 }
2470
2471 static inline void btrfs_set_dev_stats_value(struct extent_buffer *eb,
2472                                              struct btrfs_dev_stats_item *ptr,
2473                                              int index, u64 val)
2474 {
2475         write_extent_buffer(eb, &val,
2476                             offsetof(struct btrfs_dev_stats_item, values) +
2477                              ((unsigned long)ptr) + (index * sizeof(u64)),
2478                             sizeof(val));
2479 }
2480
2481 /* btrfs_qgroup_status_item */
2482 BTRFS_SETGET_FUNCS(qgroup_status_generation, struct btrfs_qgroup_status_item,
2483                    generation, 64);
2484 BTRFS_SETGET_FUNCS(qgroup_status_version, struct btrfs_qgroup_status_item,
2485                    version, 64);
2486 BTRFS_SETGET_FUNCS(qgroup_status_flags, struct btrfs_qgroup_status_item,
2487                    flags, 64);
2488 BTRFS_SETGET_FUNCS(qgroup_status_rescan, struct btrfs_qgroup_status_item,
2489                    rescan, 64);
2490
2491 /* btrfs_qgroup_info_item */
2492 BTRFS_SETGET_FUNCS(qgroup_info_generation, struct btrfs_qgroup_info_item,
2493                    generation, 64);
2494 BTRFS_SETGET_FUNCS(qgroup_info_rfer, struct btrfs_qgroup_info_item, rfer, 64);
2495 BTRFS_SETGET_FUNCS(qgroup_info_rfer_cmpr, struct btrfs_qgroup_info_item,
2496                    rfer_cmpr, 64);
2497 BTRFS_SETGET_FUNCS(qgroup_info_excl, struct btrfs_qgroup_info_item, excl, 64);
2498 BTRFS_SETGET_FUNCS(qgroup_info_excl_cmpr, struct btrfs_qgroup_info_item,
2499                    excl_cmpr, 64);
2500
2501 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_generation,
2502                          struct btrfs_qgroup_info_item, generation, 64);
2503 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_rfer, struct btrfs_qgroup_info_item,
2504                          rfer, 64);
2505 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_rfer_cmpr,
2506                          struct btrfs_qgroup_info_item, rfer_cmpr, 64);
2507 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_excl, struct btrfs_qgroup_info_item,
2508                          excl, 64);
2509 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_excl_cmpr,
2510                          struct btrfs_qgroup_info_item, excl_cmpr, 64);
2511
2512 /* btrfs_qgroup_limit_item */
2513 BTRFS_SETGET_FUNCS(qgroup_limit_flags, struct btrfs_qgroup_limit_item,
2514                    flags, 64);
2515 BTRFS_SETGET_FUNCS(qgroup_limit_max_rfer, struct btrfs_qgroup_limit_item,
2516                    max_rfer, 64);
2517 BTRFS_SETGET_FUNCS(qgroup_limit_max_excl, struct btrfs_qgroup_limit_item,
2518                    max_excl, 64);
2519 BTRFS_SETGET_FUNCS(qgroup_limit_rsv_rfer, struct btrfs_qgroup_limit_item,
2520                    rsv_rfer, 64);
2521 BTRFS_SETGET_FUNCS(qgroup_limit_rsv_excl, struct btrfs_qgroup_limit_item,
2522                    rsv_excl, 64);
2523
2524 /* btrfs_dev_replace_item */
2525 BTRFS_SETGET_FUNCS(dev_replace_src_devid,
2526                    struct btrfs_dev_replace_item, src_devid, 64);
2527 BTRFS_SETGET_FUNCS(dev_replace_cont_reading_from_srcdev_mode,
2528                    struct btrfs_dev_replace_item, cont_reading_from_srcdev_mode,
2529                    64);
2530 BTRFS_SETGET_FUNCS(dev_replace_replace_state, struct btrfs_dev_replace_item,
2531                    replace_state, 64);
2532 BTRFS_SETGET_FUNCS(dev_replace_time_started, struct btrfs_dev_replace_item,
2533                    time_started, 64);
2534 BTRFS_SETGET_FUNCS(dev_replace_time_stopped, struct btrfs_dev_replace_item,
2535                    time_stopped, 64);
2536 BTRFS_SETGET_FUNCS(dev_replace_num_write_errors, struct btrfs_dev_replace_item,
2537                    num_write_errors, 64);
2538 BTRFS_SETGET_FUNCS(dev_replace_num_uncorrectable_read_errors,
2539                    struct btrfs_dev_replace_item, num_uncorrectable_read_errors,
2540                    64);
2541 BTRFS_SETGET_FUNCS(dev_replace_cursor_left, struct btrfs_dev_replace_item,
2542                    cursor_left, 64);
2543 BTRFS_SETGET_FUNCS(dev_replace_cursor_right, struct btrfs_dev_replace_item,
2544                    cursor_right, 64);
2545
2546 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_src_devid,
2547                          struct btrfs_dev_replace_item, src_devid, 64);
2548 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_cont_reading_from_srcdev_mode,
2549                          struct btrfs_dev_replace_item,
2550                          cont_reading_from_srcdev_mode, 64);
2551 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_replace_state,
2552                          struct btrfs_dev_replace_item, replace_state, 64);
2553 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_time_started,
2554                          struct btrfs_dev_replace_item, time_started, 64);
2555 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_time_stopped,
2556                          struct btrfs_dev_replace_item, time_stopped, 64);
2557 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_num_write_errors,
2558                          struct btrfs_dev_replace_item, num_write_errors, 64);
2559 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_num_uncorrectable_read_errors,
2560                          struct btrfs_dev_replace_item,
2561                          num_uncorrectable_read_errors, 64);
2562 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_cursor_left,
2563                          struct btrfs_dev_replace_item, cursor_left, 64);
2564 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_cursor_right,
2565                          struct btrfs_dev_replace_item, cursor_right, 64);
2566
2567 /* helper function to cast into the data area of the leaf. */
2568 #define btrfs_item_ptr(leaf, slot, type) \
2569         ((type *)(BTRFS_LEAF_DATA_OFFSET + \
2570         btrfs_item_offset_nr(leaf, slot)))
2571
2572 #define btrfs_item_ptr_offset(leaf, slot) \
2573         ((unsigned long)(BTRFS_LEAF_DATA_OFFSET + \
2574         btrfs_item_offset_nr(leaf, slot)))
2575
2576 static inline u64 btrfs_name_hash(const char *name, int len)
2577 {
2578        return crc32c((u32)~1, name, len);
2579 }
2580
2581 /*
2582  * Figure the key offset of an extended inode ref
2583  */
2584 static inline u64 btrfs_extref_hash(u64 parent_objectid, const char *name,
2585                                    int len)
2586 {
2587        return (u64) crc32c(parent_objectid, name, len);
2588 }
2589
2590 static inline bool btrfs_mixed_space_info(struct btrfs_space_info *space_info)
2591 {
2592         return ((space_info->flags & BTRFS_BLOCK_GROUP_METADATA) &&
2593                 (space_info->flags & BTRFS_BLOCK_GROUP_DATA));
2594 }
2595
2596 static inline gfp_t btrfs_alloc_write_mask(struct address_space *mapping)
2597 {
2598         return mapping_gfp_constraint(mapping, ~__GFP_FS);
2599 }
2600
2601 /* extent-tree.c */
2602
2603 enum btrfs_inline_ref_type {
2604         BTRFS_REF_TYPE_INVALID =         0,
2605         BTRFS_REF_TYPE_BLOCK =           1,
2606         BTRFS_REF_TYPE_DATA =            2,
2607         BTRFS_REF_TYPE_ANY =             3,
2608 };
2609
2610 int btrfs_get_extent_inline_ref_type(const struct extent_buffer *eb,
2611                                      struct btrfs_extent_inline_ref *iref,
2612                                      enum btrfs_inline_ref_type is_data);
2613
2614 u64 btrfs_csum_bytes_to_leaves(struct btrfs_fs_info *fs_info, u64 csum_bytes);
2615
2616 static inline u64 btrfs_calc_trans_metadata_size(struct btrfs_fs_info *fs_info,
2617                                                  unsigned num_items)
2618 {
2619         return (u64)fs_info->nodesize * BTRFS_MAX_LEVEL * 2 * num_items;
2620 }
2621
2622 /*
2623  * Doing a truncate won't result in new nodes or leaves, just what we need for
2624  * COW.
2625  */
2626 static inline u64 btrfs_calc_trunc_metadata_size(struct btrfs_fs_info *fs_info,
2627                                                  unsigned num_items)
2628 {
2629         return (u64)fs_info->nodesize * BTRFS_MAX_LEVEL * num_items;
2630 }
2631
2632 int btrfs_should_throttle_delayed_refs(struct btrfs_trans_handle *trans,
2633                                        struct btrfs_fs_info *fs_info);
2634 int btrfs_check_space_for_delayed_refs(struct btrfs_trans_handle *trans,
2635                                        struct btrfs_fs_info *fs_info);
2636 void btrfs_dec_block_group_reservations(struct btrfs_fs_info *fs_info,
2637                                          const u64 start);
2638 void btrfs_wait_block_group_reservations(struct btrfs_block_group_cache *bg);
2639 bool btrfs_inc_nocow_writers(struct btrfs_fs_info *fs_info, u64 bytenr);
2640 void btrfs_dec_nocow_writers(struct btrfs_fs_info *fs_info, u64 bytenr);
2641 void btrfs_wait_nocow_writers(struct btrfs_block_group_cache *bg);
2642 void btrfs_put_block_group(struct btrfs_block_group_cache *cache);
2643 int btrfs_run_delayed_refs(struct btrfs_trans_handle *trans,
2644                            unsigned long count);
2645 int btrfs_async_run_delayed_refs(struct btrfs_fs_info *fs_info,
2646                                  unsigned long count, u64 transid, int wait);
2647 int btrfs_lookup_data_extent(struct btrfs_fs_info *fs_info, u64 start, u64 len);
2648 int btrfs_lookup_extent_info(struct btrfs_trans_handle *trans,
2649                              struct btrfs_fs_info *fs_info, u64 bytenr,
2650                              u64 offset, int metadata, u64 *refs, u64 *flags);
2651 int btrfs_pin_extent(struct btrfs_fs_info *fs_info,
2652                      u64 bytenr, u64 num, int reserved);
2653 int btrfs_pin_extent_for_log_replay(struct btrfs_fs_info *fs_info,
2654                                     u64 bytenr, u64 num_bytes);
2655 int btrfs_exclude_logged_extents(struct btrfs_fs_info *fs_info,
2656                                  struct extent_buffer *eb);
2657 int btrfs_cross_ref_exist(struct btrfs_root *root,
2658                           u64 objectid, u64 offset, u64 bytenr);
2659 struct btrfs_block_group_cache *btrfs_lookup_block_group(
2660                                                  struct btrfs_fs_info *info,
2661                                                  u64 bytenr);
2662 void btrfs_get_block_group(struct btrfs_block_group_cache *cache);
2663 void btrfs_put_block_group(struct btrfs_block_group_cache *cache);
2664 struct extent_buffer *btrfs_alloc_tree_block(struct btrfs_trans_handle *trans,
2665                                              struct btrfs_root *root,
2666                                              u64 parent, u64 root_objectid,
2667                                              const struct btrfs_disk_key *key,
2668                                              int level, u64 hint,
2669                                              u64 empty_size);
2670 void btrfs_free_tree_block(struct btrfs_trans_handle *trans,
2671                            struct btrfs_root *root,
2672                            struct extent_buffer *buf,
2673                            u64 parent, int last_ref);
2674 int btrfs_alloc_reserved_file_extent(struct btrfs_trans_handle *trans,
2675                                      struct btrfs_root *root, u64 owner,
2676                                      u64 offset, u64 ram_bytes,
2677                                      struct btrfs_key *ins);
2678 int btrfs_alloc_logged_file_extent(struct btrfs_trans_handle *trans,
2679                                    struct btrfs_fs_info *fs_info,
2680                                    u64 root_objectid, u64 owner, u64 offset,
2681                                    struct btrfs_key *ins);
2682 int btrfs_reserve_extent(struct btrfs_root *root, u64 ram_bytes, u64 num_bytes,
2683                          u64 min_alloc_size, u64 empty_size, u64 hint_byte,
2684                          struct btrfs_key *ins, int is_data, int delalloc);
2685 int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2686                   struct extent_buffer *buf, int full_backref);
2687 int btrfs_dec_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2688                   struct extent_buffer *buf, int full_backref);
2689 int btrfs_set_disk_extent_flags(struct btrfs_trans_handle *trans,
2690                                 struct btrfs_fs_info *fs_info,
2691                                 u64 bytenr, u64 num_bytes, u64 flags,
2692                                 int level, int is_data);
2693 int btrfs_free_extent(struct btrfs_trans_handle *trans,
2694                       struct btrfs_root *root,
2695                       u64 bytenr, u64 num_bytes, u64 parent, u64 root_objectid,
2696                       u64 owner, u64 offset);
2697
2698 int btrfs_free_reserved_extent(struct btrfs_fs_info *fs_info,
2699                                u64 start, u64 len, int delalloc);
2700 int btrfs_free_and_pin_reserved_extent(struct btrfs_fs_info *fs_info,
2701                                        u64 start, u64 len);
2702 void btrfs_prepare_extent_commit(struct btrfs_fs_info *fs_info);
2703 int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans);
2704 int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
2705                          struct btrfs_root *root,
2706                          u64 bytenr, u64 num_bytes, u64 parent,
2707                          u64 root_objectid, u64 owner, u64 offset);
2708
2709 int btrfs_start_dirty_block_groups(struct btrfs_trans_handle *trans);
2710 int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans,
2711                                    struct btrfs_fs_info *fs_info);
2712 int btrfs_setup_space_cache(struct btrfs_trans_handle *trans,
2713                             struct btrfs_fs_info *fs_info);
2714 int btrfs_extent_readonly(struct btrfs_fs_info *fs_info, u64 bytenr);
2715 int btrfs_free_block_groups(struct btrfs_fs_info *info);
2716 int btrfs_read_block_groups(struct btrfs_fs_info *info);
2717 int btrfs_can_relocate(struct btrfs_fs_info *fs_info, u64 bytenr);
2718 int btrfs_make_block_group(struct btrfs_trans_handle *trans,
2719                            struct btrfs_fs_info *fs_info, u64 bytes_used,
2720                            u64 type, u64 chunk_offset, u64 size);
2721 void btrfs_add_raid_kobjects(struct btrfs_fs_info *fs_info);
2722 struct btrfs_trans_handle *btrfs_start_trans_remove_block_group(
2723                                 struct btrfs_fs_info *fs_info,
2724                                 const u64 chunk_offset);
2725 int btrfs_remove_block_group(struct btrfs_trans_handle *trans,
2726                              struct btrfs_fs_info *fs_info, u64 group_start,
2727                              struct extent_map *em);
2728 void btrfs_delete_unused_bgs(struct btrfs_fs_info *fs_info);
2729 void btrfs_get_block_group_trimming(struct btrfs_block_group_cache *cache);
2730 void btrfs_put_block_group_trimming(struct btrfs_block_group_cache *cache);
2731 void btrfs_create_pending_block_groups(struct btrfs_trans_handle *trans);
2732 u64 btrfs_data_alloc_profile(struct btrfs_fs_info *fs_info);
2733 u64 btrfs_metadata_alloc_profile(struct btrfs_fs_info *fs_info);
2734 u64 btrfs_system_alloc_profile(struct btrfs_fs_info *fs_info);
2735 void btrfs_clear_space_info_full(struct btrfs_fs_info *info);
2736
2737 enum btrfs_reserve_flush_enum {
2738         /* If we are in the transaction, we can't flush anything.*/
2739         BTRFS_RESERVE_NO_FLUSH,
2740         /*
2741          * Flushing delalloc may cause deadlock somewhere, in this
2742          * case, use FLUSH LIMIT
2743          */
2744         BTRFS_RESERVE_FLUSH_LIMIT,
2745         BTRFS_RESERVE_FLUSH_ALL,
2746 };
2747
2748 enum btrfs_flush_state {
2749         FLUSH_DELAYED_ITEMS_NR  =       1,
2750         FLUSH_DELAYED_ITEMS     =       2,
2751         FLUSH_DELALLOC          =       3,
2752         FLUSH_DELALLOC_WAIT     =       4,
2753         ALLOC_CHUNK             =       5,
2754         COMMIT_TRANS            =       6,
2755 };
2756
2757 int btrfs_alloc_data_chunk_ondemand(struct btrfs_inode *inode, u64 bytes);
2758 int btrfs_check_data_free_space(struct inode *inode,
2759                         struct extent_changeset **reserved, u64 start, u64 len);
2760 void btrfs_free_reserved_data_space(struct inode *inode,
2761                         struct extent_changeset *reserved, u64 start, u64 len);
2762 void btrfs_delalloc_release_space(struct inode *inode,
2763                                   struct extent_changeset *reserved,
2764                                   u64 start, u64 len, bool qgroup_free);
2765 void btrfs_free_reserved_data_space_noquota(struct inode *inode, u64 start,
2766                                             u64 len);
2767 void btrfs_trans_release_chunk_metadata(struct btrfs_trans_handle *trans);
2768 int btrfs_subvolume_reserve_metadata(struct btrfs_root *root,
2769                                      struct btrfs_block_rsv *rsv,
2770                                      int nitems, bool use_global_rsv);
2771 void btrfs_subvolume_release_metadata(struct btrfs_fs_info *fs_info,
2772                                       struct btrfs_block_rsv *rsv);
2773 void btrfs_delalloc_release_extents(struct btrfs_inode *inode, u64 num_bytes,
2774                                     bool qgroup_free);
2775
2776 int btrfs_delalloc_reserve_metadata(struct btrfs_inode *inode, u64 num_bytes);
2777 void btrfs_delalloc_release_metadata(struct btrfs_inode *inode, u64 num_bytes,
2778                                      bool qgroup_free);
2779 int btrfs_delalloc_reserve_space(struct inode *inode,
2780                         struct extent_changeset **reserved, u64 start, u64 len);
2781 void btrfs_init_block_rsv(struct btrfs_block_rsv *rsv, unsigned short type);
2782 struct btrfs_block_rsv *btrfs_alloc_block_rsv(struct btrfs_fs_info *fs_info,
2783                                               unsigned short type);
2784 void btrfs_init_metadata_block_rsv(struct btrfs_fs_info *fs_info,
2785                                    struct btrfs_block_rsv *rsv,
2786                                    unsigned short type);
2787 void btrfs_free_block_rsv(struct btrfs_fs_info *fs_info,
2788                           struct btrfs_block_rsv *rsv);
2789 void __btrfs_free_block_rsv(struct btrfs_block_rsv *rsv);
2790 int btrfs_block_rsv_add(struct btrfs_root *root,
2791                         struct btrfs_block_rsv *block_rsv, u64 num_bytes,
2792                         enum btrfs_reserve_flush_enum flush);
2793 int btrfs_block_rsv_check(struct btrfs_block_rsv *block_rsv, int min_factor);
2794 int btrfs_block_rsv_refill(struct btrfs_root *root,
2795                            struct btrfs_block_rsv *block_rsv, u64 min_reserved,
2796                            enum btrfs_reserve_flush_enum flush);
2797 int btrfs_block_rsv_migrate(struct btrfs_block_rsv *src_rsv,
2798                             struct btrfs_block_rsv *dst_rsv, u64 num_bytes,
2799                             int update_size);
2800 int btrfs_cond_migrate_bytes(struct btrfs_fs_info *fs_info,
2801                              struct btrfs_block_rsv *dest, u64 num_bytes,
2802                              int min_factor);
2803 void btrfs_block_rsv_release(struct btrfs_fs_info *fs_info,
2804                              struct btrfs_block_rsv *block_rsv,
2805                              u64 num_bytes);
2806 int btrfs_inc_block_group_ro(struct btrfs_fs_info *fs_info,
2807                              struct btrfs_block_group_cache *cache);
2808 void btrfs_dec_block_group_ro(struct btrfs_block_group_cache *cache);
2809 void btrfs_put_block_group_cache(struct btrfs_fs_info *info);
2810 u64 btrfs_account_ro_block_groups_free_space(struct btrfs_space_info *sinfo);
2811 int btrfs_error_unpin_extent_range(struct btrfs_fs_info *fs_info,
2812                                    u64 start, u64 end);
2813 int btrfs_discard_extent(struct btrfs_fs_info *fs_info, u64 bytenr,
2814                          u64 num_bytes, u64 *actual_bytes);
2815 int btrfs_force_chunk_alloc(struct btrfs_trans_handle *trans,
2816                             struct btrfs_fs_info *fs_info, u64 type);
2817 int btrfs_trim_fs(struct btrfs_fs_info *fs_info, struct fstrim_range *range);
2818
2819 int btrfs_init_space_info(struct btrfs_fs_info *fs_info);
2820 int btrfs_delayed_refs_qgroup_accounting(struct btrfs_trans_handle *trans,
2821                                          struct btrfs_fs_info *fs_info);
2822 int btrfs_start_write_no_snapshotting(struct btrfs_root *root);
2823 void btrfs_end_write_no_snapshotting(struct btrfs_root *root);
2824 void btrfs_wait_for_snapshot_creation(struct btrfs_root *root);
2825 void check_system_chunk(struct btrfs_trans_handle *trans,
2826                         struct btrfs_fs_info *fs_info, const u64 type);
2827 u64 add_new_free_space(struct btrfs_block_group_cache *block_group,
2828                        u64 start, u64 end);
2829
2830 /* ctree.c */
2831 int btrfs_bin_search(struct extent_buffer *eb, const struct btrfs_key *key,
2832                      int level, int *slot);
2833 int btrfs_comp_cpu_keys(const struct btrfs_key *k1, const struct btrfs_key *k2);
2834 int btrfs_previous_item(struct btrfs_root *root,
2835                         struct btrfs_path *path, u64 min_objectid,
2836                         int type);
2837 int btrfs_previous_extent_item(struct btrfs_root *root,
2838                         struct btrfs_path *path, u64 min_objectid);
2839 void btrfs_set_item_key_safe(struct btrfs_fs_info *fs_info,
2840                              struct btrfs_path *path,
2841                              const struct btrfs_key *new_key);
2842 struct extent_buffer *btrfs_root_node(struct btrfs_root *root);
2843 struct extent_buffer *btrfs_lock_root_node(struct btrfs_root *root);
2844 struct extent_buffer *btrfs_read_lock_root_node(struct btrfs_root *root);
2845 int btrfs_find_next_key(struct btrfs_root *root, struct btrfs_path *path,
2846                         struct btrfs_key *key, int lowest_level,
2847                         u64 min_trans);
2848 int btrfs_search_forward(struct btrfs_root *root, struct btrfs_key *min_key,
2849                          struct btrfs_path *path,
2850                          u64 min_trans);
2851 enum btrfs_compare_tree_result {
2852         BTRFS_COMPARE_TREE_NEW,
2853         BTRFS_COMPARE_TREE_DELETED,
2854         BTRFS_COMPARE_TREE_CHANGED,
2855         BTRFS_COMPARE_TREE_SAME,
2856 };
2857 typedef int (*btrfs_changed_cb_t)(struct btrfs_path *left_path,
2858                                   struct btrfs_path *right_path,
2859                                   struct btrfs_key *key,
2860                                   enum btrfs_compare_tree_result result,
2861                                   void *ctx);
2862 int btrfs_compare_trees(struct btrfs_root *left_root,
2863                         struct btrfs_root *right_root,
2864                         btrfs_changed_cb_t cb, void *ctx);
2865 int btrfs_cow_block(struct btrfs_trans_handle *trans,
2866                     struct btrfs_root *root, struct extent_buffer *buf,
2867                     struct extent_buffer *parent, int parent_slot,
2868                     struct extent_buffer **cow_ret);
2869 int btrfs_copy_root(struct btrfs_trans_handle *trans,
2870                       struct btrfs_root *root,
2871                       struct extent_buffer *buf,
2872                       struct extent_buffer **cow_ret, u64 new_root_objectid);
2873 int btrfs_block_can_be_shared(struct btrfs_root *root,
2874                               struct extent_buffer *buf);
2875 void btrfs_extend_item(struct btrfs_fs_info *fs_info, struct btrfs_path *path,
2876                        u32 data_size);
2877 void btrfs_truncate_item(struct btrfs_fs_info *fs_info,
2878                          struct btrfs_path *path, u32 new_size, int from_end);
2879 int btrfs_split_item(struct btrfs_trans_handle *trans,
2880                      struct btrfs_root *root,
2881                      struct btrfs_path *path,
2882                      const struct btrfs_key *new_key,
2883                      unsigned long split_offset);
2884 int btrfs_duplicate_item(struct btrfs_trans_handle *trans,
2885                          struct btrfs_root *root,
2886                          struct btrfs_path *path,
2887                          const struct btrfs_key *new_key);
2888 int btrfs_find_item(struct btrfs_root *fs_root, struct btrfs_path *path,
2889                 u64 inum, u64 ioff, u8 key_type, struct btrfs_key *found_key);
2890 int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2891                       const struct btrfs_key *key, struct btrfs_path *p,
2892                       int ins_len, int cow);
2893 int btrfs_search_old_slot(struct btrfs_root *root, const struct btrfs_key *key,
2894                           struct btrfs_path *p, u64 time_seq);
2895 int btrfs_search_slot_for_read(struct btrfs_root *root,
2896                                const struct btrfs_key *key,
2897                                struct btrfs_path *p, int find_higher,
2898                                int return_any);
2899 int btrfs_realloc_node(struct btrfs_trans_handle *trans,
2900                        struct btrfs_root *root, struct extent_buffer *parent,
2901                        int start_slot, u64 *last_ret,
2902                        struct btrfs_key *progress);
2903 void btrfs_release_path(struct btrfs_path *p);
2904 struct btrfs_path *btrfs_alloc_path(void);
2905 void btrfs_free_path(struct btrfs_path *p);
2906 void btrfs_set_path_blocking(struct btrfs_path *p);
2907 void btrfs_clear_path_blocking(struct btrfs_path *p,
2908                                struct extent_buffer *held, int held_rw);
2909 void btrfs_unlock_up_safe(struct btrfs_path *p, int level);
2910
2911 int btrfs_del_items(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2912                    struct btrfs_path *path, int slot, int nr);
2913 static inline int btrfs_del_item(struct btrfs_trans_handle *trans,
2914                                  struct btrfs_root *root,
2915                                  struct btrfs_path *path)
2916 {
2917         return btrfs_del_items(trans, root, path, path->slots[0], 1);
2918 }
2919
2920 void setup_items_for_insert(struct btrfs_root *root, struct btrfs_path *path,
2921                             const struct btrfs_key *cpu_key, u32 *data_size,
2922                             u32 total_data, u32 total_size, int nr);
2923 int btrfs_insert_item(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2924                       const struct btrfs_key *key, void *data, u32 data_size);
2925 int btrfs_insert_empty_items(struct btrfs_trans_handle *trans,
2926                              struct btrfs_root *root,
2927                              struct btrfs_path *path,
2928                              const struct btrfs_key *cpu_key, u32 *data_size,
2929                              int nr);
2930
2931 static inline int btrfs_insert_empty_item(struct btrfs_trans_handle *trans,
2932                                           struct btrfs_root *root,
2933                                           struct btrfs_path *path,
2934                                           const struct btrfs_key *key,
2935                                           u32 data_size)
2936 {
2937         return btrfs_insert_empty_items(trans, root, path, key, &data_size, 1);
2938 }
2939
2940 int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path);
2941 int btrfs_prev_leaf(struct btrfs_root *root, struct btrfs_path *path);
2942 int btrfs_next_old_leaf(struct btrfs_root *root, struct btrfs_path *path,
2943                         u64 time_seq);
2944 static inline int btrfs_next_old_item(struct btrfs_root *root,
2945                                       struct btrfs_path *p, u64 time_seq)
2946 {
2947         ++p->slots[0];
2948         if (p->slots[0] >= btrfs_header_nritems(p->nodes[0]))
2949                 return btrfs_next_old_leaf(root, p, time_seq);
2950         return 0;
2951 }
2952 static inline int btrfs_next_item(struct btrfs_root *root, struct btrfs_path *p)
2953 {
2954         return btrfs_next_old_item(root, p, 0);
2955 }
2956 int btrfs_leaf_free_space(struct btrfs_fs_info *fs_info,
2957                           struct extent_buffer *leaf);
2958 int __must_check btrfs_drop_snapshot(struct btrfs_root *root,
2959                                      struct btrfs_block_rsv *block_rsv,
2960                                      int update_ref, int for_reloc);
2961 int btrfs_drop_subtree(struct btrfs_trans_handle *trans,
2962                         struct btrfs_root *root,
2963                         struct extent_buffer *node,
2964                         struct extent_buffer *parent);
2965 static inline int btrfs_fs_closing(struct btrfs_fs_info *fs_info)
2966 {
2967         /*
2968          * Do it this way so we only ever do one test_bit in the normal case.
2969          */
2970         if (test_bit(BTRFS_FS_CLOSING_START, &fs_info->flags)) {
2971                 if (test_bit(BTRFS_FS_CLOSING_DONE, &fs_info->flags))
2972                         return 2;
2973                 return 1;
2974         }
2975         return 0;
2976 }
2977
2978 /*
2979  * If we remount the fs to be R/O or umount the fs, the cleaner needn't do
2980  * anything except sleeping. This function is used to check the status of
2981  * the fs.
2982  */
2983 static inline int btrfs_need_cleaner_sleep(struct btrfs_fs_info *fs_info)
2984 {
2985         return fs_info->sb->s_flags & SB_RDONLY || btrfs_fs_closing(fs_info);
2986 }
2987
2988 static inline void free_fs_info(struct btrfs_fs_info *fs_info)
2989 {
2990         kfree(fs_info->balance_ctl);
2991         kfree(fs_info->delayed_root);
2992         kfree(fs_info->extent_root);
2993         kfree(fs_info->tree_root);
2994         kfree(fs_info->chunk_root);
2995         kfree(fs_info->dev_root);
2996         kfree(fs_info->csum_root);
2997         kfree(fs_info->quota_root);
2998         kfree(fs_info->uuid_root);
2999         kfree(fs_info->free_space_root);
3000         kfree(fs_info->super_copy);
3001         kfree(fs_info->super_for_commit);
3002         security_free_mnt_opts(&fs_info->security_opts);
3003         kvfree(fs_info);
3004 }
3005
3006 /* tree mod log functions from ctree.c */
3007 u64 btrfs_get_tree_mod_seq(struct btrfs_fs_info *fs_info,
3008                            struct seq_list *elem);
3009 void btrfs_put_tree_mod_seq(struct btrfs_fs_info *fs_info,
3010                             struct seq_list *elem);
3011 int btrfs_old_root_level(struct btrfs_root *root, u64 time_seq);
3012
3013 /* root-item.c */
3014 int btrfs_add_root_ref(struct btrfs_trans_handle *trans,
3015                        struct btrfs_fs_info *fs_info,
3016                        u64 root_id, u64 ref_id, u64 dirid, u64 sequence,
3017                        const char *name, int name_len);
3018 int btrfs_del_root_ref(struct btrfs_trans_handle *trans,
3019                        struct btrfs_fs_info *fs_info,
3020                        u64 root_id, u64 ref_id, u64 dirid, u64 *sequence,
3021                        const char *name, int name_len);
3022 int btrfs_del_root(struct btrfs_trans_handle *trans,
3023                    struct btrfs_fs_info *fs_info, const struct btrfs_key *key);
3024 int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
3025                       const struct btrfs_key *key,
3026                       struct btrfs_root_item *item);
3027 int __must_check btrfs_update_root(struct btrfs_trans_handle *trans,
3028                                    struct btrfs_root *root,
3029                                    struct btrfs_key *key,
3030                                    struct btrfs_root_item *item);
3031 int btrfs_find_root(struct btrfs_root *root, const struct btrfs_key *search_key,
3032                     struct btrfs_path *path, struct btrfs_root_item *root_item,
3033                     struct btrfs_key *root_key);
3034 int btrfs_find_orphan_roots(struct btrfs_fs_info *fs_info);
3035 void btrfs_set_root_node(struct btrfs_root_item *item,
3036                          struct extent_buffer *node);
3037 void btrfs_check_and_init_root_item(struct btrfs_root_item *item);
3038 void btrfs_update_root_times(struct btrfs_trans_handle *trans,
3039                              struct btrfs_root *root);
3040
3041 /* uuid-tree.c */
3042 int btrfs_uuid_tree_add(struct btrfs_trans_handle *trans, u8 *uuid, u8 type,
3043                         u64 subid);
3044 int btrfs_uuid_tree_remove(struct btrfs_trans_handle *trans, u8 *uuid, u8 type,
3045                         u64 subid);
3046 int btrfs_uuid_tree_iterate(struct btrfs_fs_info *fs_info,
3047                             int (*check_func)(struct btrfs_fs_info *, u8 *, u8,
3048                                               u64));
3049
3050 /* dir-item.c */
3051 int btrfs_check_dir_item_collision(struct btrfs_root *root, u64 dir,
3052                           const char *name, int name_len);
3053 int btrfs_insert_dir_item(struct btrfs_trans_handle *trans,
3054                           struct btrfs_root *root, const char *name,
3055                           int name_len, struct btrfs_inode *dir,
3056                           struct btrfs_key *location, u8 type, u64 index);
3057 struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans,
3058                                              struct btrfs_root *root,
3059                                              struct btrfs_path *path, u64 dir,
3060                                              const char *name, int name_len,
3061                                              int mod);
3062 struct btrfs_dir_item *
3063 btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans,
3064                             struct btrfs_root *root,
3065                             struct btrfs_path *path, u64 dir,
3066                             u64 objectid, const char *name, int name_len,
3067                             int mod);
3068 struct btrfs_dir_item *
3069 btrfs_search_dir_index_item(struct btrfs_root *root,
3070                             struct btrfs_path *path, u64 dirid,
3071                             const char *name, int name_len);
3072 int btrfs_delete_one_dir_name(struct btrfs_trans_handle *trans,
3073                               struct btrfs_root *root,
3074                               struct btrfs_path *path,
3075                               struct btrfs_dir_item *di);
3076 int btrfs_insert_xattr_item(struct btrfs_trans_handle *trans,
3077                             struct btrfs_root *root,
3078                             struct btrfs_path *path, u64 objectid,
3079                             const char *name, u16 name_len,
3080                             const void *data, u16 data_len);
3081 struct btrfs_dir_item *btrfs_lookup_xattr(struct btrfs_trans_handle *trans,
3082                                           struct btrfs_root *root,
3083                                           struct btrfs_path *path, u64 dir,
3084                                           const char *name, u16 name_len,
3085                                           int mod);
3086 struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_fs_info *fs_info,
3087                                                  struct btrfs_path *path,
3088                                                  const char *name,
3089                                                  int name_len);
3090
3091 /* orphan.c */
3092 int btrfs_insert_orphan_item(struct btrfs_trans_handle *trans,
3093                              struct btrfs_root *root, u64 offset);
3094 int btrfs_del_orphan_item(struct btrfs_trans_handle *trans,
3095                           struct btrfs_root *root, u64 offset);
3096 int btrfs_find_orphan_item(struct btrfs_root *root, u64 offset);
3097
3098 /* inode-item.c */
3099 int btrfs_insert_inode_ref(struct btrfs_trans_handle *trans,
3100                            struct btrfs_root *root,
3101                            const char *name, int name_len,
3102                            u64 inode_objectid, u64 ref_objectid, u64 index);
3103 int btrfs_del_inode_ref(struct btrfs_trans_handle *trans,
3104                            struct btrfs_root *root,
3105                            const char *name, int name_len,
3106                            u64 inode_objectid, u64 ref_objectid, u64 *index);
3107 int btrfs_insert_empty_inode(struct btrfs_trans_handle *trans,
3108                              struct btrfs_root *root,
3109                              struct btrfs_path *path, u64 objectid);
3110 int btrfs_lookup_inode(struct btrfs_trans_handle *trans, struct btrfs_root
3111                        *root, struct btrfs_path *path,
3112                        struct btrfs_key *location, int mod);
3113
3114 struct btrfs_inode_extref *
3115 btrfs_lookup_inode_extref(struct btrfs_trans_handle *trans,
3116                           struct btrfs_root *root,
3117                           struct btrfs_path *path,
3118                           const char *name, int name_len,
3119                           u64 inode_objectid, u64 ref_objectid, int ins_len,
3120                           int cow);
3121
3122 int btrfs_find_name_in_backref(struct extent_buffer *leaf, int slot,
3123                                const char *name,
3124                                int name_len, struct btrfs_inode_ref **ref_ret);
3125 int btrfs_find_name_in_ext_backref(struct extent_buffer *leaf, int slot,
3126                                    u64 ref_objectid, const char *name,
3127                                    int name_len,
3128                                    struct btrfs_inode_extref **extref_ret);
3129
3130 /* file-item.c */
3131 struct btrfs_dio_private;
3132 int btrfs_del_csums(struct btrfs_trans_handle *trans,
3133                     struct btrfs_fs_info *fs_info, u64 bytenr, u64 len);
3134 blk_status_t btrfs_lookup_bio_sums(struct inode *inode, struct bio *bio, u32 *dst);
3135 blk_status_t btrfs_lookup_bio_sums_dio(struct inode *inode, struct bio *bio,
3136                               u64 logical_offset);
3137 int btrfs_insert_file_extent(struct btrfs_trans_handle *trans,
3138                              struct btrfs_root *root,
3139                              u64 objectid, u64 pos,
3140                              u64 disk_offset, u64 disk_num_bytes,
3141                              u64 num_bytes, u64 offset, u64 ram_bytes,
3142                              u8 compression, u8 encryption, u16 other_encoding);
3143 int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
3144                              struct btrfs_root *root,
3145                              struct btrfs_path *path, u64 objectid,
3146                              u64 bytenr, int mod);
3147 int btrfs_csum_file_blocks(struct btrfs_trans_handle *trans,
3148                            struct btrfs_root *root,
3149                            struct btrfs_ordered_sum *sums);
3150 blk_status_t btrfs_csum_one_bio(struct inode *inode, struct bio *bio,
3151                        u64 file_start, int contig);
3152 int btrfs_lookup_csums_range(struct btrfs_root *root, u64 start, u64 end,
3153                              struct list_head *list, int search_commit);
3154 void btrfs_extent_item_to_extent_map(struct btrfs_inode *inode,
3155                                      const struct btrfs_path *path,
3156                                      struct btrfs_file_extent_item *fi,
3157                                      const bool new_inline,
3158                                      struct extent_map *em);
3159
3160 /* inode.c */
3161 struct extent_map *btrfs_get_extent_fiemap(struct btrfs_inode *inode,
3162                 struct page *page, size_t pg_offset, u64 start,
3163                 u64 len, int create);
3164 noinline int can_nocow_extent(struct inode *inode, u64 offset, u64 *len,
3165                               u64 *orig_start, u64 *orig_block_len,
3166                               u64 *ram_bytes);
3167
3168 void __btrfs_del_delalloc_inode(struct btrfs_root *root,
3169                                 struct btrfs_inode *inode);
3170 struct inode *btrfs_lookup_dentry(struct inode *dir, struct dentry *dentry);
3171 int btrfs_set_inode_index(struct btrfs_inode *dir, u64 *index);
3172 int btrfs_unlink_inode(struct btrfs_trans_handle *trans,
3173                        struct btrfs_root *root,
3174                        struct btrfs_inode *dir, struct btrfs_inode *inode,
3175                        const char *name, int name_len);
3176 int btrfs_add_link(struct btrfs_trans_handle *trans,
3177                    struct btrfs_inode *parent_inode, struct btrfs_inode *inode,
3178                    const char *name, int name_len, int add_backref, u64 index);
3179 int btrfs_delete_subvolume(struct inode *dir, struct dentry *dentry);
3180 int btrfs_truncate_block(struct inode *inode, loff_t from, loff_t len,
3181                         int front);
3182 int btrfs_truncate_inode_items(struct btrfs_trans_handle *trans,
3183                                struct btrfs_root *root,
3184                                struct inode *inode, u64 new_size,
3185                                u32 min_type);
3186
3187 int btrfs_start_delalloc_inodes(struct btrfs_root *root);
3188 int btrfs_start_delalloc_roots(struct btrfs_fs_info *fs_info, int nr);
3189 int btrfs_set_extent_delalloc(struct inode *inode, u64 start, u64 end,
3190                               unsigned int extra_bits,
3191                               struct extent_state **cached_state, int dedupe);
3192 int btrfs_create_subvol_root(struct btrfs_trans_handle *trans,
3193                              struct btrfs_root *new_root,
3194                              struct btrfs_root *parent_root,
3195                              u64 new_dirid);
3196 int btrfs_merge_bio_hook(struct page *page, unsigned long offset,
3197                          size_t size, struct bio *bio,
3198                          unsigned long bio_flags);
3199 void btrfs_set_range_writeback(void *private_data, u64 start, u64 end);
3200 vm_fault_t btrfs_page_mkwrite(struct vm_fault *vmf);
3201 int btrfs_readpage(struct file *file, struct page *page);
3202 void btrfs_evict_inode(struct inode *inode);
3203 int btrfs_write_inode(struct inode *inode, struct writeback_control *wbc);
3204 struct inode *btrfs_alloc_inode(struct super_block *sb);
3205 void btrfs_destroy_inode(struct inode *inode);
3206 int btrfs_drop_inode(struct inode *inode);
3207 int __init btrfs_init_cachep(void);
3208 void __cold btrfs_destroy_cachep(void);
3209 struct inode *btrfs_iget(struct super_block *s, struct btrfs_key *location,
3210                          struct btrfs_root *root, int *was_new);
3211 struct extent_map *btrfs_get_extent(struct btrfs_inode *inode,
3212                 struct page *page, size_t pg_offset,
3213                 u64 start, u64 end, int create);
3214 int btrfs_update_inode(struct btrfs_trans_handle *trans,
3215                               struct btrfs_root *root,
3216                               struct inode *inode);
3217 int btrfs_update_inode_fallback(struct btrfs_trans_handle *trans,
3218                                 struct btrfs_root *root, struct inode *inode);
3219 int btrfs_orphan_add(struct btrfs_trans_handle *trans,
3220                 struct btrfs_inode *inode);
3221 int btrfs_orphan_cleanup(struct btrfs_root *root);
3222 int btrfs_cont_expand(struct inode *inode, loff_t oldsize, loff_t size);
3223 void btrfs_add_delayed_iput(struct inode *inode);
3224 void btrfs_run_delayed_iputs(struct btrfs_fs_info *fs_info);
3225 int btrfs_prealloc_file_range(struct inode *inode, int mode,
3226                               u64 start, u64 num_bytes, u64 min_size,
3227                               loff_t actual_len, u64 *alloc_hint);
3228 int btrfs_prealloc_file_range_trans(struct inode *inode,
3229                                     struct btrfs_trans_handle *trans, int mode,
3230                                     u64 start, u64 num_bytes, u64 min_size,
3231                                     loff_t actual_len, u64 *alloc_hint);
3232 extern const struct dentry_operations btrfs_dentry_operations;
3233 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
3234 void btrfs_test_inode_set_ops(struct inode *inode);
3235 #endif
3236
3237 /* ioctl.c */
3238 long btrfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
3239 long btrfs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
3240 int btrfs_ioctl_get_supported_features(void __user *arg);
3241 void btrfs_sync_inode_flags_to_i_flags(struct inode *inode);
3242 int btrfs_is_empty_uuid(u8 *uuid);
3243 int btrfs_defrag_file(struct inode *inode, struct file *file,
3244                       struct btrfs_ioctl_defrag_range_args *range,
3245                       u64 newer_than, unsigned long max_pages);
3246 void btrfs_get_block_group_info(struct list_head *groups_list,
3247                                 struct btrfs_ioctl_space_info *space);
3248 void btrfs_update_ioctl_balance_args(struct btrfs_fs_info *fs_info,
3249                                struct btrfs_ioctl_balance_args *bargs);
3250 ssize_t btrfs_dedupe_file_range(struct file *src_file, u64 loff, u64 olen,
3251                            struct file *dst_file, u64 dst_loff);
3252
3253 /* file.c */
3254 int __init btrfs_auto_defrag_init(void);
3255 void __cold btrfs_auto_defrag_exit(void);
3256 int btrfs_add_inode_defrag(struct btrfs_trans_handle *trans,
3257                            struct btrfs_inode *inode);
3258 int btrfs_run_defrag_inodes(struct btrfs_fs_info *fs_info);
3259 void btrfs_cleanup_defrag_inodes(struct btrfs_fs_info *fs_info);
3260 int btrfs_sync_file(struct file *file, loff_t start, loff_t end, int datasync);
3261 void btrfs_drop_extent_cache(struct btrfs_inode *inode, u64 start, u64 end,
3262                              int skip_pinned);
3263 extern const struct file_operations btrfs_file_operations;
3264 int __btrfs_drop_extents(struct btrfs_trans_handle *trans,
3265                          struct btrfs_root *root, struct inode *inode,
3266                          struct btrfs_path *path, u64 start, u64 end,
3267                          u64 *drop_end, int drop_cache,
3268                          int replace_extent,
3269                          u32 extent_item_size,
3270                          int *key_inserted);
3271 int btrfs_drop_extents(struct btrfs_trans_handle *trans,
3272                        struct btrfs_root *root, struct inode *inode, u64 start,
3273                        u64 end, int drop_cache);
3274 int btrfs_mark_extent_written(struct btrfs_trans_handle *trans,
3275                               struct btrfs_inode *inode, u64 start, u64 end);
3276 int btrfs_release_file(struct inode *inode, struct file *file);
3277 int btrfs_dirty_pages(struct inode *inode, struct page **pages,
3278                       size_t num_pages, loff_t pos, size_t write_bytes,
3279                       struct extent_state **cached);
3280 int btrfs_fdatawrite_range(struct inode *inode, loff_t start, loff_t end);
3281 int btrfs_clone_file_range(struct file *file_in, loff_t pos_in,
3282                            struct file *file_out, loff_t pos_out, u64 len);
3283
3284 /* tree-defrag.c */
3285 int btrfs_defrag_leaves(struct btrfs_trans_handle *trans,
3286                         struct btrfs_root *root);
3287
3288 /* sysfs.c */
3289 int __init btrfs_init_sysfs(void);
3290 void __cold btrfs_exit_sysfs(void);
3291 int btrfs_sysfs_add_mounted(struct btrfs_fs_info *fs_info);
3292 void btrfs_sysfs_remove_mounted(struct btrfs_fs_info *fs_info);
3293
3294 /* super.c */
3295 int btrfs_parse_options(struct btrfs_fs_info *info, char *options,
3296                         unsigned long new_flags);
3297 int btrfs_sync_fs(struct super_block *sb, int wait);
3298
3299 static inline __printf(2, 3) __cold
3300 void btrfs_no_printk(const struct btrfs_fs_info *fs_info, const char *fmt, ...)
3301 {
3302 }
3303
3304 #ifdef CONFIG_PRINTK
3305 __printf(2, 3)
3306 __cold
3307 void btrfs_printk(const struct btrfs_fs_info *fs_info, const char *fmt, ...);
3308 #else
3309 #define btrfs_printk(fs_info, fmt, args...) \
3310         btrfs_no_printk(fs_info, fmt, ##args)
3311 #endif
3312
3313 #define btrfs_emerg(fs_info, fmt, args...) \
3314         btrfs_printk(fs_info, KERN_EMERG fmt, ##args)
3315 #define btrfs_alert(fs_info, fmt, args...) \
3316         btrfs_printk(fs_info, KERN_ALERT fmt, ##args)
3317 #define btrfs_crit(fs_info, fmt, args...) \
3318         btrfs_printk(fs_info, KERN_CRIT fmt, ##args)
3319 #define btrfs_err(fs_info, fmt, args...) \
3320         btrfs_printk(fs_info, KERN_ERR fmt, ##args)
3321 #define btrfs_warn(fs_info, fmt, args...) \
3322         btrfs_printk(fs_info, KERN_WARNING fmt, ##args)
3323 #define btrfs_notice(fs_info, fmt, args...) \
3324         btrfs_printk(fs_info, KERN_NOTICE fmt, ##args)
3325 #define btrfs_info(fs_info, fmt, args...) \
3326         btrfs_printk(fs_info, KERN_INFO fmt, ##args)
3327
3328 /*
3329  * Wrappers that use printk_in_rcu
3330  */
3331 #define btrfs_emerg_in_rcu(fs_info, fmt, args...) \
3332         btrfs_printk_in_rcu(fs_info, KERN_EMERG fmt, ##args)
3333 #define btrfs_alert_in_rcu(fs_info, fmt, args...) \
3334         btrfs_printk_in_rcu(fs_info, KERN_ALERT fmt, ##args)
3335 #define btrfs_crit_in_rcu(fs_info, fmt, args...) \
3336         btrfs_printk_in_rcu(fs_info, KERN_CRIT fmt, ##args)
3337 #define btrfs_err_in_rcu(fs_info, fmt, args...) \
3338         btrfs_printk_in_rcu(fs_info, KERN_ERR fmt, ##args)
3339 #define btrfs_warn_in_rcu(fs_info, fmt, args...) \
3340         btrfs_printk_in_rcu(fs_info, KERN_WARNING fmt, ##args)
3341 #define btrfs_notice_in_rcu(fs_info, fmt, args...) \
3342         btrfs_printk_in_rcu(fs_info, KERN_NOTICE fmt, ##args)
3343 #define btrfs_info_in_rcu(fs_info, fmt, args...) \
3344         btrfs_printk_in_rcu(fs_info, KERN_INFO fmt, ##args)
3345
3346 /*
3347  * Wrappers that use a ratelimited printk_in_rcu
3348  */
3349 #define btrfs_emerg_rl_in_rcu(fs_info, fmt, args...) \
3350         btrfs_printk_rl_in_rcu(fs_info, KERN_EMERG fmt, ##args)
3351 #define btrfs_alert_rl_in_rcu(fs_info, fmt, args...) \
3352         btrfs_printk_rl_in_rcu(fs_info, KERN_ALERT fmt, ##args)
3353 #define btrfs_crit_rl_in_rcu(fs_info, fmt, args...) \
3354         btrfs_printk_rl_in_rcu(fs_info, KERN_CRIT fmt, ##args)
3355 #define btrfs_err_rl_in_rcu(fs_info, fmt, args...) \
3356         btrfs_printk_rl_in_rcu(fs_info, KERN_ERR fmt, ##args)
3357 #define btrfs_warn_rl_in_rcu(fs_info, fmt, args...) \
3358         btrfs_printk_rl_in_rcu(fs_info, KERN_WARNING fmt, ##args)
3359 #define btrfs_notice_rl_in_rcu(fs_info, fmt, args...) \
3360         btrfs_printk_rl_in_rcu(fs_info, KERN_NOTICE fmt, ##args)
3361 #define btrfs_info_rl_in_rcu(fs_info, fmt, args...) \
3362         btrfs_printk_rl_in_rcu(fs_info, KERN_INFO fmt, ##args)
3363
3364 /*
3365  * Wrappers that use a ratelimited printk
3366  */
3367 #define btrfs_emerg_rl(fs_info, fmt, args...) \
3368         btrfs_printk_ratelimited(fs_info, KERN_EMERG fmt, ##args)
3369 #define btrfs_alert_rl(fs_info, fmt, args...) \
3370         btrfs_printk_ratelimited(fs_info, KERN_ALERT fmt, ##args)
3371 #define btrfs_crit_rl(fs_info, fmt, args...) \
3372         btrfs_printk_ratelimited(fs_info, KERN_CRIT fmt, ##args)
3373 #define btrfs_err_rl(fs_info, fmt, args...) \
3374         btrfs_printk_ratelimited(fs_info, KERN_ERR fmt, ##args)
3375 #define btrfs_warn_rl(fs_info, fmt, args...) \
3376         btrfs_printk_ratelimited(fs_info, KERN_WARNING fmt, ##args)
3377 #define btrfs_notice_rl(fs_info, fmt, args...) \
3378         btrfs_printk_ratelimited(fs_info, KERN_NOTICE fmt, ##args)
3379 #define btrfs_info_rl(fs_info, fmt, args...) \
3380         btrfs_printk_ratelimited(fs_info, KERN_INFO fmt, ##args)
3381
3382 #if defined(CONFIG_DYNAMIC_DEBUG)
3383 #define btrfs_debug(fs_info, fmt, args...)                              \
3384 do {                                                                    \
3385         DEFINE_DYNAMIC_DEBUG_METADATA(descriptor, fmt);                 \
3386         if (unlikely(descriptor.flags & _DPRINTK_FLAGS_PRINT))          \
3387                 btrfs_printk(fs_info, KERN_DEBUG fmt, ##args);          \
3388 } while (0)
3389 #define btrfs_debug_in_rcu(fs_info, fmt, args...)                       \
3390 do {                                                                    \
3391         DEFINE_DYNAMIC_DEBUG_METADATA(descriptor, fmt);                 \
3392         if (unlikely(descriptor.flags & _DPRINTK_FLAGS_PRINT))          \
3393                 btrfs_printk_in_rcu(fs_info, KERN_DEBUG fmt, ##args);   \
3394 } while (0)
3395 #define btrfs_debug_rl_in_rcu(fs_info, fmt, args...)                    \
3396 do {                                                                    \
3397         DEFINE_DYNAMIC_DEBUG_METADATA(descriptor, fmt);                 \
3398         if (unlikely(descriptor.flags & _DPRINTK_FLAGS_PRINT))          \
3399                 btrfs_printk_rl_in_rcu(fs_info, KERN_DEBUG fmt,         \
3400                                        ##args);\
3401 } while (0)
3402 #define btrfs_debug_rl(fs_info, fmt, args...)                           \
3403 do {                                                                    \
3404         DEFINE_DYNAMIC_DEBUG_METADATA(descriptor, fmt);                 \
3405         if (unlikely(descriptor.flags & _DPRINTK_FLAGS_PRINT))          \
3406                 btrfs_printk_ratelimited(fs_info, KERN_DEBUG fmt,       \
3407                                          ##args);                       \
3408 } while (0)
3409 #elif defined(DEBUG)
3410 #define btrfs_debug(fs_info, fmt, args...) \
3411         btrfs_printk(fs_info, KERN_DEBUG fmt, ##args)
3412 #define btrfs_debug_in_rcu(fs_info, fmt, args...) \
3413         btrfs_printk_in_rcu(fs_info, KERN_DEBUG fmt, ##args)
3414 #define btrfs_debug_rl_in_rcu(fs_info, fmt, args...) \
3415         btrfs_printk_rl_in_rcu(fs_info, KERN_DEBUG fmt, ##args)
3416 #define btrfs_debug_rl(fs_info, fmt, args...) \
3417         btrfs_printk_ratelimited(fs_info, KERN_DEBUG fmt, ##args)
3418 #else
3419 #define btrfs_debug(fs_info, fmt, args...) \
3420         btrfs_no_printk(fs_info, KERN_DEBUG fmt, ##args)
3421 #define btrfs_debug_in_rcu(fs_info, fmt, args...) \
3422         btrfs_no_printk(fs_info, KERN_DEBUG fmt, ##args)
3423 #define btrfs_debug_rl_in_rcu(fs_info, fmt, args...) \
3424         btrfs_no_printk(fs_info, KERN_DEBUG fmt, ##args)
3425 #define btrfs_debug_rl(fs_info, fmt, args...) \
3426         btrfs_no_printk(fs_info, KERN_DEBUG fmt, ##args)
3427 #endif
3428
3429 #define btrfs_printk_in_rcu(fs_info, fmt, args...)      \
3430 do {                                                    \
3431         rcu_read_lock();                                \
3432         btrfs_printk(fs_info, fmt, ##args);             \
3433         rcu_read_unlock();                              \
3434 } while (0)
3435
3436 #define btrfs_printk_ratelimited(fs_info, fmt, args...)         \
3437 do {                                                            \
3438         static DEFINE_RATELIMIT_STATE(_rs,                      \
3439                 DEFAULT_RATELIMIT_INTERVAL,                     \
3440                 DEFAULT_RATELIMIT_BURST);                       \
3441         if (__ratelimit(&_rs))                                  \
3442                 btrfs_printk(fs_info, fmt, ##args);             \
3443 } while (0)
3444
3445 #define btrfs_printk_rl_in_rcu(fs_info, fmt, args...)           \
3446 do {                                                            \
3447         rcu_read_lock();                                        \
3448         btrfs_printk_ratelimited(fs_info, fmt, ##args);         \
3449         rcu_read_unlock();                                      \
3450 } while (0)
3451
3452 #ifdef CONFIG_BTRFS_ASSERT
3453
3454 __cold
3455 static inline void assfail(char *expr, char *file, int line)
3456 {
3457         pr_err("assertion failed: %s, file: %s, line: %d\n",
3458                expr, file, line);
3459         BUG();
3460 }
3461
3462 #define ASSERT(expr)    \
3463         (likely(expr) ? (void)0 : assfail(#expr, __FILE__, __LINE__))
3464 #else
3465 #define ASSERT(expr)    ((void)0)
3466 #endif
3467
3468 __printf(5, 6)
3469 __cold
3470 void __btrfs_handle_fs_error(struct btrfs_fs_info *fs_info, const char *function,
3471                      unsigned int line, int errno, const char *fmt, ...);
3472
3473 const char *btrfs_decode_error(int errno);
3474
3475 __cold
3476 void __btrfs_abort_transaction(struct btrfs_trans_handle *trans,
3477                                const char *function,
3478                                unsigned int line, int errno);
3479
3480 /*
3481  * Call btrfs_abort_transaction as early as possible when an error condition is
3482  * detected, that way the exact line number is reported.
3483  */
3484 #define btrfs_abort_transaction(trans, errno)           \
3485 do {                                                            \
3486         /* Report first abort since mount */                    \
3487         if (!test_and_set_bit(BTRFS_FS_STATE_TRANS_ABORTED,     \
3488                         &((trans)->fs_info->fs_state))) {       \
3489                 if ((errno) != -EIO) {                          \
3490                         WARN(1, KERN_DEBUG                              \
3491                         "BTRFS: Transaction aborted (error %d)\n",      \
3492                         (errno));                                       \
3493                 } else {                                                \
3494                         btrfs_debug((trans)->fs_info,                   \
3495                                     "Transaction aborted (error %d)", \
3496                                   (errno));                     \
3497                 }                                               \
3498         }                                                       \
3499         __btrfs_abort_transaction((trans), __func__,            \
3500                                   __LINE__, (errno));           \
3501 } while (0)
3502
3503 #define btrfs_handle_fs_error(fs_info, errno, fmt, args...)             \
3504 do {                                                            \
3505         __btrfs_handle_fs_error((fs_info), __func__, __LINE__,  \
3506                           (errno), fmt, ##args);                \
3507 } while (0)
3508
3509 __printf(5, 6)
3510 __cold
3511 void __btrfs_panic(struct btrfs_fs_info *fs_info, const char *function,
3512                    unsigned int line, int errno, const char *fmt, ...);
3513 /*
3514  * If BTRFS_MOUNT_PANIC_ON_FATAL_ERROR is in mount_opt, __btrfs_panic
3515  * will panic().  Otherwise we BUG() here.
3516  */
3517 #define btrfs_panic(fs_info, errno, fmt, args...)                       \
3518 do {                                                                    \
3519         __btrfs_panic(fs_info, __func__, __LINE__, errno, fmt, ##args); \
3520         BUG();                                                          \
3521 } while (0)
3522
3523
3524 /* compatibility and incompatibility defines */
3525
3526 #define btrfs_set_fs_incompat(__fs_info, opt) \
3527         __btrfs_set_fs_incompat((__fs_info), BTRFS_FEATURE_INCOMPAT_##opt)
3528
3529 static inline void __btrfs_set_fs_incompat(struct btrfs_fs_info *fs_info,
3530                                            u64 flag)
3531 {
3532         struct btrfs_super_block *disk_super;
3533         u64 features;
3534
3535         disk_super = fs_info->super_copy;
3536         features = btrfs_super_incompat_flags(disk_super);
3537         if (!(features & flag)) {
3538                 spin_lock(&fs_info->super_lock);
3539                 features = btrfs_super_incompat_flags(disk_super);
3540                 if (!(features & flag)) {
3541                         features |= flag;
3542                         btrfs_set_super_incompat_flags(disk_super, features);
3543                         btrfs_info(fs_info, "setting %llu feature flag",
3544                                          flag);
3545                 }
3546                 spin_unlock(&fs_info->super_lock);
3547         }
3548 }
3549
3550 #define btrfs_clear_fs_incompat(__fs_info, opt) \
3551         __btrfs_clear_fs_incompat((__fs_info), BTRFS_FEATURE_INCOMPAT_##opt)
3552
3553 static inline void __btrfs_clear_fs_incompat(struct btrfs_fs_info *fs_info,
3554                                              u64 flag)
3555 {
3556         struct btrfs_super_block *disk_super;
3557         u64 features;
3558
3559         disk_super = fs_info->super_copy;
3560         features = btrfs_super_incompat_flags(disk_super);
3561         if (features & flag) {
3562                 spin_lock(&fs_info->super_lock);
3563                 features = btrfs_super_incompat_flags(disk_super);
3564                 if (features & flag) {
3565                         features &= ~flag;
3566                         btrfs_set_super_incompat_flags(disk_super, features);
3567                         btrfs_info(fs_info, "clearing %llu feature flag",
3568                                          flag);
3569                 }
3570                 spin_unlock(&fs_info->super_lock);
3571         }
3572 }
3573
3574 #define btrfs_fs_incompat(fs_info, opt) \
3575         __btrfs_fs_incompat((fs_info), BTRFS_FEATURE_INCOMPAT_##opt)
3576
3577 static inline bool __btrfs_fs_incompat(struct btrfs_fs_info *fs_info, u64 flag)
3578 {
3579         struct btrfs_super_block *disk_super;
3580         disk_super = fs_info->super_copy;
3581         return !!(btrfs_super_incompat_flags(disk_super) & flag);
3582 }
3583
3584 #define btrfs_set_fs_compat_ro(__fs_info, opt) \
3585         __btrfs_set_fs_compat_ro((__fs_info), BTRFS_FEATURE_COMPAT_RO_##opt)
3586
3587 static inline void __btrfs_set_fs_compat_ro(struct btrfs_fs_info *fs_info,
3588                                             u64 flag)
3589 {
3590         struct btrfs_super_block *disk_super;
3591         u64 features;
3592
3593         disk_super = fs_info->super_copy;
3594         features = btrfs_super_compat_ro_flags(disk_super);
3595         if (!(features & flag)) {
3596                 spin_lock(&fs_info->super_lock);
3597                 features = btrfs_super_compat_ro_flags(disk_super);
3598                 if (!(features & flag)) {
3599                         features |= flag;
3600                         btrfs_set_super_compat_ro_flags(disk_super, features);
3601                         btrfs_info(fs_info, "setting %llu ro feature flag",
3602                                    flag);
3603                 }
3604                 spin_unlock(&fs_info->super_lock);
3605         }
3606 }
3607
3608 #define btrfs_clear_fs_compat_ro(__fs_info, opt) \
3609         __btrfs_clear_fs_compat_ro((__fs_info), BTRFS_FEATURE_COMPAT_RO_##opt)
3610
3611 static inline void __btrfs_clear_fs_compat_ro(struct btrfs_fs_info *fs_info,
3612                                               u64 flag)
3613 {
3614         struct btrfs_super_block *disk_super;
3615         u64 features;
3616
3617         disk_super = fs_info->super_copy;
3618         features = btrfs_super_compat_ro_flags(disk_super);
3619         if (features & flag) {
3620                 spin_lock(&fs_info->super_lock);
3621                 features = btrfs_super_compat_ro_flags(disk_super);
3622                 if (features & flag) {
3623                         features &= ~flag;
3624                         btrfs_set_super_compat_ro_flags(disk_super, features);
3625                         btrfs_info(fs_info, "clearing %llu ro feature flag",
3626                                    flag);
3627                 }
3628                 spin_unlock(&fs_info->super_lock);
3629         }
3630 }
3631
3632 #define btrfs_fs_compat_ro(fs_info, opt) \
3633         __btrfs_fs_compat_ro((fs_info), BTRFS_FEATURE_COMPAT_RO_##opt)
3634
3635 static inline int __btrfs_fs_compat_ro(struct btrfs_fs_info *fs_info, u64 flag)
3636 {
3637         struct btrfs_super_block *disk_super;
3638         disk_super = fs_info->super_copy;
3639         return !!(btrfs_super_compat_ro_flags(disk_super) & flag);
3640 }
3641
3642 /* acl.c */
3643 #ifdef CONFIG_BTRFS_FS_POSIX_ACL
3644 struct posix_acl *btrfs_get_acl(struct inode *inode, int type);
3645 int btrfs_set_acl(struct inode *inode, struct posix_acl *acl, int type);
3646 int btrfs_init_acl(struct btrfs_trans_handle *trans,
3647                    struct inode *inode, struct inode *dir);
3648 #else
3649 #define btrfs_get_acl NULL
3650 #define btrfs_set_acl NULL
3651 static inline int btrfs_init_acl(struct btrfs_trans_handle *trans,
3652                                  struct inode *inode, struct inode *dir)
3653 {
3654         return 0;
3655 }
3656 #endif
3657
3658 /* relocation.c */
3659 int btrfs_relocate_block_group(struct btrfs_fs_info *fs_info, u64 group_start);
3660 int btrfs_init_reloc_root(struct btrfs_trans_handle *trans,
3661                           struct btrfs_root *root);
3662 int btrfs_update_reloc_root(struct btrfs_trans_handle *trans,
3663                             struct btrfs_root *root);
3664 int btrfs_recover_relocation(struct btrfs_root *root);
3665 int btrfs_reloc_clone_csums(struct inode *inode, u64 file_pos, u64 len);
3666 int btrfs_reloc_cow_block(struct btrfs_trans_handle *trans,
3667                           struct btrfs_root *root, struct extent_buffer *buf,
3668                           struct extent_buffer *cow);
3669 void btrfs_reloc_pre_snapshot(struct btrfs_pending_snapshot *pending,
3670                               u64 *bytes_to_reserve);
3671 int btrfs_reloc_post_snapshot(struct btrfs_trans_handle *trans,
3672                               struct btrfs_pending_snapshot *pending);
3673
3674 /* scrub.c */
3675 int btrfs_scrub_dev(struct btrfs_fs_info *fs_info, u64 devid, u64 start,
3676                     u64 end, struct btrfs_scrub_progress *progress,
3677                     int readonly, int is_dev_replace);
3678 void btrfs_scrub_pause(struct btrfs_fs_info *fs_info);
3679 void btrfs_scrub_continue(struct btrfs_fs_info *fs_info);
3680 int btrfs_scrub_cancel(struct btrfs_fs_info *info);
3681 int btrfs_scrub_cancel_dev(struct btrfs_fs_info *info,
3682                            struct btrfs_device *dev);
3683 int btrfs_scrub_progress(struct btrfs_fs_info *fs_info, u64 devid,
3684                          struct btrfs_scrub_progress *progress);
3685 static inline void btrfs_init_full_stripe_locks_tree(
3686                         struct btrfs_full_stripe_locks_tree *locks_root)
3687 {
3688         locks_root->root = RB_ROOT;
3689         mutex_init(&locks_root->lock);
3690 }
3691
3692 /* dev-replace.c */
3693 void btrfs_bio_counter_inc_blocked(struct btrfs_fs_info *fs_info);
3694 void btrfs_bio_counter_inc_noblocked(struct btrfs_fs_info *fs_info);
3695 void btrfs_bio_counter_sub(struct btrfs_fs_info *fs_info, s64 amount);
3696
3697 static inline void btrfs_bio_counter_dec(struct btrfs_fs_info *fs_info)
3698 {
3699         btrfs_bio_counter_sub(fs_info, 1);
3700 }
3701
3702 /* reada.c */
3703 struct reada_control {
3704         struct btrfs_fs_info    *fs_info;               /* tree to prefetch */
3705         struct btrfs_key        key_start;
3706         struct btrfs_key        key_end;        /* exclusive */
3707         atomic_t                elems;
3708         struct kref             refcnt;
3709         wait_queue_head_t       wait;
3710 };
3711 struct reada_control *btrfs_reada_add(struct btrfs_root *root,
3712                               struct btrfs_key *start, struct btrfs_key *end);
3713 int btrfs_reada_wait(void *handle);
3714 void btrfs_reada_detach(void *handle);
3715 int btree_readahead_hook(struct extent_buffer *eb, int err);
3716
3717 static inline int is_fstree(u64 rootid)
3718 {
3719         if (rootid == BTRFS_FS_TREE_OBJECTID ||
3720             ((s64)rootid >= (s64)BTRFS_FIRST_FREE_OBJECTID &&
3721               !btrfs_qgroup_level(rootid)))
3722                 return 1;
3723         return 0;
3724 }
3725
3726 static inline int btrfs_defrag_cancelled(struct btrfs_fs_info *fs_info)
3727 {
3728         return signal_pending(current);
3729 }
3730
3731 /* Sanity test specific functions */
3732 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
3733 void btrfs_test_destroy_inode(struct inode *inode);
3734 #endif
3735
3736 static inline int btrfs_is_testing(struct btrfs_fs_info *fs_info)
3737 {
3738 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
3739         if (unlikely(test_bit(BTRFS_FS_STATE_DUMMY_FS_INFO,
3740                               &fs_info->fs_state)))
3741                 return 1;
3742 #endif
3743         return 0;
3744 }
3745
3746 static inline void cond_wake_up(struct wait_queue_head *wq)
3747 {
3748         /*
3749          * This implies a full smp_mb barrier, see comments for
3750          * waitqueue_active why.
3751          */
3752         if (wq_has_sleeper(wq))
3753                 wake_up(wq);
3754 }
3755
3756 static inline void cond_wake_up_nomb(struct wait_queue_head *wq)
3757 {
3758         /*
3759          * Special case for conditional wakeup where the barrier required for
3760          * waitqueue_active is implied by some of the preceding code. Eg. one
3761          * of such atomic operations (atomic_dec_and_return, ...), or a
3762          * unlock/lock sequence, etc.
3763          */
3764         if (waitqueue_active(wq))
3765                 wake_up(wq);
3766 }
3767
3768 #endif