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 extern struct kmem_cache *btrfs_free_space_bitmap_cachep;
  43 struct btrfs_ordered_sum;
  44
  45 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
  46 #define STATIC noinline
  47 #else
  48 #define STATIC static noinline
  49 #endif
  50
  51 #define BTRFS_MAGIC 0x4D5F53665248425FULL /* ascii _BHRfS_M, no null */
  52
  53 #define BTRFS_MAX_MIRRORS 3
  54
  55 #define BTRFS_MAX_LEVEL 8
  56
  57 #define BTRFS_OLDEST_GENERATION 0ULL
  58
  59 /*
  60  * the max metadata block size.  This limit is somewhat artificial,
  61  * but the memmove costs go through the roof for larger blocks.
  62  */
  63 #define BTRFS_MAX_METADATA_BLOCKSIZE 65536
  64
  65 /*
  66  * we can actually store much bigger names, but lets not confuse the rest
  67  * of linux
  68  */
  69 #define BTRFS_NAME_LEN 255
  70
  71 /*
  72  * Theoretical limit is larger, but we keep this down to a sane
  73  * value. That should limit greatly the possibility of collisions on
  74  * inode ref items.
  75  */
  76 #define BTRFS_LINK_MAX 65535U
  77
  78 /* four bytes for CRC32 */
  79 static const int btrfs_csum_sizes[] = { 4 };
  80
  81 #define BTRFS_EMPTY_DIR_SIZE 0
  82
  83 /* ioprio of readahead is set to idle */
  84 #define BTRFS_IOPRIO_READA (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_IDLE, 0))
  85
  86 #define BTRFS_DIRTY_METADATA_THRESH     SZ_32M
  87
  88 /*
  89  * Use large batch size to reduce overhead of metadata updates.  On the reader
  90  * side, we only read it when we are close to ENOSPC and the read overhead is
  91  * mostly related to the number of CPUs, so it is OK to use arbitrary large
  92  * value here.
  93  */
  94 #define BTRFS_TOTAL_BYTES_PINNED_BATCH  SZ_128M
  95
  96 #define BTRFS_MAX_EXTENT_SIZE SZ_128M
  97
  98
  99 /*
 100  * Count how many BTRFS_MAX_EXTENT_SIZE cover the @size
 101  */
 102 static inline u32 count_max_extents(u64 size)
 103 {
 104         return div_u64(size + BTRFS_MAX_EXTENT_SIZE - 1, BTRFS_MAX_EXTENT_SIZE);
 105 }
 106
 107 struct btrfs_mapping_tree {
 108         struct extent_map_tree map_tree;
 109 };
 110
 111 static inline unsigned long btrfs_chunk_item_size(int num_stripes)
 112 {
 113         BUG_ON(num_stripes == 0);
 114         return sizeof(struct btrfs_chunk) +
 115                 sizeof(struct btrfs_stripe) * (num_stripes - 1);
 116 }
 117
 118 /*
 119  * File system states
 120  */
 121 #define BTRFS_FS_STATE_ERROR            0
 122 #define BTRFS_FS_STATE_REMOUNTING       1
 123 #define BTRFS_FS_STATE_TRANS_ABORTED    2
 124 #define BTRFS_FS_STATE_DEV_REPLACING    3
 125 #define BTRFS_FS_STATE_DUMMY_FS_INFO    4
 126
 127 #define BTRFS_BACKREF_REV_MAX           256
 128 #define BTRFS_BACKREF_REV_SHIFT         56
 129 #define BTRFS_BACKREF_REV_MASK          (((u64)BTRFS_BACKREF_REV_MAX - 1) << \
 130                                          BTRFS_BACKREF_REV_SHIFT)
 131
 132 #define BTRFS_OLD_BACKREF_REV           0
 133 #define BTRFS_MIXED_BACKREF_REV         1
 134
 135 /*
 136  * every tree block (leaf or node) starts with this header.
 137  */
 138 struct btrfs_header {
 139         /* these first four must match the super block */
 140         u8 csum[BTRFS_CSUM_SIZE];
 141         u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
 142         __le64 bytenr; /* which block this node is supposed to live in */
 143         __le64 flags;
 144
 145         /* allowed to be different from the super from here on down */
 146         u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
 147         __le64 generation;
 148         __le64 owner;
 149         __le32 nritems;
 150         u8 level;
 151 } __attribute__ ((__packed__));
 152
 153 /*
 154  * this is a very generous portion of the super block, giving us
 155  * room to translate 14 chunks with 3 stripes each.
 156  */
 157 #define BTRFS_SYSTEM_CHUNK_ARRAY_SIZE 2048
 158
 159 /*
 160  * just in case we somehow lose the roots and are not able to mount,
 161  * we store an array of the roots from previous transactions
 162  * in the super.
 163  */
 164 #define BTRFS_NUM_BACKUP_ROOTS 4
 165 struct btrfs_root_backup {
 166         __le64 tree_root;
 167         __le64 tree_root_gen;
 168
 169         __le64 chunk_root;
 170         __le64 chunk_root_gen;
 171
 172         __le64 extent_root;
 173         __le64 extent_root_gen;
 174
 175         __le64 fs_root;
 176         __le64 fs_root_gen;
 177
 178         __le64 dev_root;
 179         __le64 dev_root_gen;
 180
 181         __le64 csum_root;
 182         __le64 csum_root_gen;
 183
 184         __le64 total_bytes;
 185         __le64 bytes_used;
 186         __le64 num_devices;
 187         /* future */
 188         __le64 unused_64[4];
 189
 190         u8 tree_root_level;
 191         u8 chunk_root_level;
 192         u8 extent_root_level;
 193         u8 fs_root_level;
 194         u8 dev_root_level;
 195         u8 csum_root_level;
 196         /* future and to align */
 197         u8 unused_8[10];
 198 } __attribute__ ((__packed__));
 199
 200 /*
 201  * the super block basically lists the main trees of the FS
 202  * it currently lacks any block count etc etc
 203  */
 204 struct btrfs_super_block {
 205         u8 csum[BTRFS_CSUM_SIZE];
 206         /* the first 4 fields must match struct btrfs_header */
 207         u8 fsid[BTRFS_FSID_SIZE];    /* FS specific uuid */
 208         __le64 bytenr; /* this block number */
 209         __le64 flags;
 210
 211         /* allowed to be different from the btrfs_header from here own down */
 212         __le64 magic;
 213         __le64 generation;
 214         __le64 root;
 215         __le64 chunk_root;
 216         __le64 log_root;
 217
 218         /* this will help find the new super based on the log root */
 219         __le64 log_root_transid;
 220         __le64 total_bytes;
 221         __le64 bytes_used;
 222         __le64 root_dir_objectid;
 223         __le64 num_devices;
 224         __le32 sectorsize;
 225         __le32 nodesize;
 226         __le32 __unused_leafsize;
 227         __le32 stripesize;
 228         __le32 sys_chunk_array_size;
 229         __le64 chunk_root_generation;
 230         __le64 compat_flags;
 231         __le64 compat_ro_flags;
 232         __le64 incompat_flags;
 233         __le16 csum_type;
 234         u8 root_level;
 235         u8 chunk_root_level;
 236         u8 log_root_level;
 237         struct btrfs_dev_item dev_item;
 238
 239         char label[BTRFS_LABEL_SIZE];
 240
 241         __le64 cache_generation;
 242         __le64 uuid_tree_generation;
 243
 244         /* future expansion */
 245         __le64 reserved[30];
 246         u8 sys_chunk_array[BTRFS_SYSTEM_CHUNK_ARRAY_SIZE];
 247         struct btrfs_root_backup super_roots[BTRFS_NUM_BACKUP_ROOTS];
 248 } __attribute__ ((__packed__));
 249
 250 /*
 251  * Compat flags that we support.  If any incompat flags are set other than the
 252  * ones specified below then we will fail to mount
 253  */
 254 #define BTRFS_FEATURE_COMPAT_SUPP               0ULL
 255 #define BTRFS_FEATURE_COMPAT_SAFE_SET           0ULL
 256 #define BTRFS_FEATURE_COMPAT_SAFE_CLEAR         0ULL
 257
 258 #define BTRFS_FEATURE_COMPAT_RO_SUPP                    \
 259         (BTRFS_FEATURE_COMPAT_RO_FREE_SPACE_TREE |      \
 260          BTRFS_FEATURE_COMPAT_RO_FREE_SPACE_TREE_VALID)
 261
 262 #define BTRFS_FEATURE_COMPAT_RO_SAFE_SET        0ULL
 263 #define BTRFS_FEATURE_COMPAT_RO_SAFE_CLEAR      0ULL
 264
 265 #define BTRFS_FEATURE_INCOMPAT_SUPP                     \
 266         (BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF |         \
 267          BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL |        \
 268          BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS |          \
 269          BTRFS_FEATURE_INCOMPAT_BIG_METADATA |          \
 270          BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO |          \
 271          BTRFS_FEATURE_INCOMPAT_COMPRESS_ZSTD |         \
 272          BTRFS_FEATURE_INCOMPAT_RAID56 |                \
 273          BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF |         \
 274          BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA |       \
 275          BTRFS_FEATURE_INCOMPAT_NO_HOLES)
 276
 277 #define BTRFS_FEATURE_INCOMPAT_SAFE_SET                 \
 278         (BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF)
 279 #define BTRFS_FEATURE_INCOMPAT_SAFE_CLEAR               0ULL
 280
 281 /*
 282  * A leaf is full of items. offset and size tell us where to find
 283  * the item in the leaf (relative to the start of the data area)
 284  */
 285 struct btrfs_item {
 286         struct btrfs_disk_key key;
 287         __le32 offset;
 288         __le32 size;
 289 } __attribute__ ((__packed__));
 290
 291 /*
 292  * leaves have an item area and a data area:
 293  * [item0, item1....itemN] [free space] [dataN...data1, data0]
 294  *
 295  * The data is separate from the items to get the keys closer together
 296  * during searches.
 297  */
 298 struct btrfs_leaf {
 299         struct btrfs_header header;
 300         struct btrfs_item items[];
 301 } __attribute__ ((__packed__));
 302
 303 /*
 304  * all non-leaf blocks are nodes, they hold only keys and pointers to
 305  * other blocks
 306  */
 307 struct btrfs_key_ptr {
 308         struct btrfs_disk_key key;
 309         __le64 blockptr;
 310         __le64 generation;
 311 } __attribute__ ((__packed__));
 312
 313 struct btrfs_node {
 314         struct btrfs_header header;
 315         struct btrfs_key_ptr ptrs[];
 316 } __attribute__ ((__packed__));
 317
 318 /*
 319  * btrfs_paths remember the path taken from the root down to the leaf.
 320  * level 0 is always the leaf, and nodes[1...BTRFS_MAX_LEVEL] will point
 321  * to any other levels that are present.
 322  *
 323  * The slots array records the index of the item or block pointer
 324  * used while walking the tree.
 325  */
 326 enum { READA_NONE = 0, READA_BACK, READA_FORWARD };
 327 struct btrfs_path {
 328         struct extent_buffer *nodes[BTRFS_MAX_LEVEL];
 329         int slots[BTRFS_MAX_LEVEL];
 330         /* if there is real range locking, this locks field will change */
 331         u8 locks[BTRFS_MAX_LEVEL];
 332         u8 reada;
 333         /* keep some upper locks as we walk down */
 334         u8 lowest_level;
 335
 336         /*
 337          * set by btrfs_split_item, tells search_slot to keep all locks
 338          * and to force calls to keep space in the nodes
 339          */
 340         unsigned int search_for_split:1;
 341         unsigned int keep_locks:1;
 342         unsigned int skip_locking:1;
 343         unsigned int leave_spinning:1;
 344         unsigned int search_commit_root:1;
 345         unsigned int need_commit_sem:1;
 346         unsigned int skip_release_on_error:1;
 347 };
 348 #define BTRFS_MAX_EXTENT_ITEM_SIZE(r) ((BTRFS_LEAF_DATA_SIZE(r->fs_info) >> 4) - \
 349                                         sizeof(struct btrfs_item))
 350 struct btrfs_dev_replace {
 351         u64 replace_state;      /* see #define above */
 352         time64_t time_started;  /* seconds since 1-Jan-1970 */
 353         time64_t time_stopped;  /* seconds since 1-Jan-1970 */
 354         atomic64_t num_write_errors;
 355         atomic64_t num_uncorrectable_read_errors;
 356
 357         u64 cursor_left;
 358         u64 committed_cursor_left;
 359         u64 cursor_left_last_write_of_item;
 360         u64 cursor_right;
 361
 362         u64 cont_reading_from_srcdev_mode;      /* see #define above */
 363
 364         int is_valid;
 365         int item_needs_writeback;
 366         struct btrfs_device *srcdev;
 367         struct btrfs_device *tgtdev;
 368
 369         struct mutex lock_finishing_cancel_unmount;
 370         rwlock_t lock;
 371         atomic_t read_locks;
 372         atomic_t blocking_readers;
 373         wait_queue_head_t read_lock_wq;
 374
 375         struct btrfs_scrub_progress scrub_progress;
 376 };
 377
 378 /* For raid type sysfs entries */
 379 struct raid_kobject {
 380         u64 flags;
 381         struct kobject kobj;
 382         struct list_head list;
 383 };
 384
 385 struct btrfs_space_info {
 386         spinlock_t lock;
 387
 388         u64 total_bytes;        /* total bytes in the space,
 389                                    this doesn't take mirrors into account */
 390         u64 bytes_used;         /* total bytes used,
 391                                    this doesn't take mirrors into account */
 392         u64 bytes_pinned;       /* total bytes pinned, will be freed when the
 393                                    transaction finishes */
 394         u64 bytes_reserved;     /* total bytes the allocator has reserved for
 395                                    current allocations */
 396         u64 bytes_may_use;      /* number of bytes that may be used for
 397                                    delalloc/allocations */
 398         u64 bytes_readonly;     /* total bytes that are read only */
 399
 400         u64 max_extent_size;    /* This will hold the maximum extent size of
 401                                    the space info if we had an ENOSPC in the
 402                                    allocator. */
 403
 404         unsigned int full:1;    /* indicates that we cannot allocate any more
 405                                    chunks for this space */
 406         unsigned int chunk_alloc:1;     /* set if we are allocating a chunk */
 407
 408         unsigned int flush:1;           /* set if we are trying to make space */
 409
 410         unsigned int force_alloc;       /* set if we need to force a chunk
 411                                            alloc for this space */
 412
 413         u64 disk_used;          /* total bytes used on disk */
 414         u64 disk_total;         /* total bytes on disk, takes mirrors into
 415                                    account */
 416
 417         u64 flags;
 418
 419         /*
 420          * bytes_pinned is kept in line with what is actually pinned, as in
 421          * we've called update_block_group and dropped the bytes_used counter
 422          * and increased the bytes_pinned counter.  However this means that
 423          * bytes_pinned does not reflect the bytes that will be pinned once the
 424          * delayed refs are flushed, so this counter is inc'ed every time we
 425          * call btrfs_free_extent so it is a realtime count of what will be
 426          * freed once the transaction is committed.  It will be zeroed every
 427          * time the transaction commits.
 428          */
 429         struct percpu_counter total_bytes_pinned;
 430
 431         struct list_head list;
 432         /* Protected by the spinlock 'lock'. */
 433         struct list_head ro_bgs;
 434         struct list_head priority_tickets;
 435         struct list_head tickets;
 436         /*
 437          * tickets_id just indicates the next ticket will be handled, so note
 438          * it's not stored per ticket.
 439          */
 440         u64 tickets_id;
 441
 442         struct rw_semaphore groups_sem;
 443         /* for block groups in our same type */
 444         struct list_head block_groups[BTRFS_NR_RAID_TYPES];
 445         wait_queue_head_t wait;
 446
 447         struct kobject kobj;
 448         struct kobject *block_group_kobjs[BTRFS_NR_RAID_TYPES];
 449 };
 450
 451 #define BTRFS_BLOCK_RSV_GLOBAL          1
 452 #define BTRFS_BLOCK_RSV_DELALLOC        2
 453 #define BTRFS_BLOCK_RSV_TRANS           3
 454 #define BTRFS_BLOCK_RSV_CHUNK           4
 455 #define BTRFS_BLOCK_RSV_DELOPS          5
 456 #define BTRFS_BLOCK_RSV_EMPTY           6
 457 #define BTRFS_BLOCK_RSV_TEMP            7
 458
 459 struct btrfs_block_rsv {
 460         u64 size;
 461         u64 reserved;
 462         struct btrfs_space_info *space_info;
 463         spinlock_t lock;
 464         unsigned short full;
 465         unsigned short type;
 466         unsigned short failfast;
 467
 468         /*
 469          * Qgroup equivalent for @size @reserved
 470          *
 471          * Unlike normal @size/@reserved for inode rsv, qgroup doesn't care
 472          * about things like csum size nor how many tree blocks it will need to
 473          * reserve.
 474          *
 475          * Qgroup cares more about net change of the extent usage.
 476          *
 477          * So for one newly inserted file extent, in worst case it will cause
 478          * leaf split and level increase, nodesize for each file extent is
 479          * already too much.
 480          *
 481          * In short, qgroup_size/reserved is the upper limit of possible needed
 482          * qgroup metadata reservation.
 483          */
 484         u64 qgroup_rsv_size;
 485         u64 qgroup_rsv_reserved;
 486 };
 487
 488 /*
 489  * free clusters are used to claim free space in relatively large chunks,
 490  * allowing us to do less seeky writes. They are used for all metadata
 491  * allocations. In ssd_spread mode they are also used for data allocations.
 492  */
 493 struct btrfs_free_cluster {
 494         spinlock_t lock;
 495         spinlock_t refill_lock;
 496         struct rb_root root;
 497
 498         /* largest extent in this cluster */
 499         u64 max_size;
 500
 501         /* first extent starting offset */
 502         u64 window_start;
 503
 504         /* We did a full search and couldn't create a cluster */
 505         bool fragmented;
 506
 507         struct btrfs_block_group_cache *block_group;
 508         /*
 509          * when a cluster is allocated from a block group, we put the
 510          * cluster onto a list in the block group so that it can
 511          * be freed before the block group is freed.
 512          */
 513         struct list_head block_group_list;
 514 };
 515
 516 enum btrfs_caching_type {
 517         BTRFS_CACHE_NO          = 0,
 518         BTRFS_CACHE_STARTED     = 1,
 519         BTRFS_CACHE_FAST        = 2,
 520         BTRFS_CACHE_FINISHED    = 3,
 521         BTRFS_CACHE_ERROR       = 4,
 522 };
 523
 524 enum btrfs_disk_cache_state {
 525         BTRFS_DC_WRITTEN        = 0,
 526         BTRFS_DC_ERROR          = 1,
 527         BTRFS_DC_CLEAR          = 2,
 528         BTRFS_DC_SETUP          = 3,
 529 };
 530
 531 struct btrfs_caching_control {
 532         struct list_head list;
 533         struct mutex mutex;
 534         wait_queue_head_t wait;
 535         struct btrfs_work work;
 536         struct btrfs_block_group_cache *block_group;
 537         u64 progress;
 538         refcount_t count;
 539 };
 540
 541 /* Once caching_thread() finds this much free space, it will wake up waiters. */
 542 #define CACHING_CTL_WAKE_UP SZ_2M
 543
 544 struct btrfs_io_ctl {
 545         void *cur, *orig;
 546         struct page *page;
 547         struct page **pages;
 548         struct btrfs_fs_info *fs_info;
 549         struct inode *inode;
 550         unsigned long size;
 551         int index;
 552         int num_pages;
 553         int entries;
 554         int bitmaps;
 555         unsigned check_crcs:1;
 556 };
 557
 558 /*
 559  * Tree to record all locked full stripes of a RAID5/6 block group
 560  */
 561 struct btrfs_full_stripe_locks_tree {
 562         struct rb_root root;
 563         struct mutex lock;
 564 };
 565
 566 struct btrfs_block_group_cache {
 567         struct btrfs_key key;
 568         struct btrfs_block_group_item item;
 569         struct btrfs_fs_info *fs_info;
 570         struct inode *inode;
 571         spinlock_t lock;
 572         u64 pinned;
 573         u64 reserved;
 574         u64 delalloc_bytes;
 575         u64 bytes_super;
 576         u64 flags;
 577         u64 cache_generation;
 578
 579         /*
 580          * If the free space extent count exceeds this number, convert the block
 581          * group to bitmaps.
 582          */
 583         u32 bitmap_high_thresh;
 584
 585         /*
 586          * If the free space extent count drops below this number, convert the
 587          * block group back to extents.
 588          */
 589         u32 bitmap_low_thresh;
 590
 591         /*
 592          * It is just used for the delayed data space allocation because
 593          * only the data space allocation and the relative metadata update
 594          * can be done cross the transaction.
 595          */
 596         struct rw_semaphore data_rwsem;
 597
 598         /* for raid56, this is a full stripe, without parity */
 599         unsigned long full_stripe_len;
 600
 601         unsigned int ro;
 602         unsigned int iref:1;
 603         unsigned int has_caching_ctl:1;
 604         unsigned int removed:1;
 605
 606         int disk_cache_state;
 607
 608         /* cache tracking stuff */
 609         int cached;
 610         struct btrfs_caching_control *caching_ctl;
 611         u64 last_byte_to_unpin;
 612
 613         struct btrfs_space_info *space_info;
 614
 615         /* free space cache stuff */
 616         struct btrfs_free_space_ctl *free_space_ctl;
 617
 618         /* block group cache stuff */
 619         struct rb_node cache_node;
 620
 621         /* for block groups in the same raid type */
 622         struct list_head list;
 623
 624         /* usage count */
 625         atomic_t count;
 626
 627         /* List of struct btrfs_free_clusters for this block group.
 628          * Today it will only have one thing on it, but that may change
 629          */
 630         struct list_head cluster_list;
 631
 632         /* For delayed block group creation or deletion of empty block groups */
 633         struct list_head bg_list;
 634
 635         /* For read-only block groups */
 636         struct list_head ro_list;
 637
 638         atomic_t trimming;
 639
 640         /* For dirty block groups */
 641         struct list_head dirty_list;
 642         struct list_head io_list;
 643
 644         struct btrfs_io_ctl io_ctl;
 645
 646         /*
 647          * Incremented when doing extent allocations and holding a read lock
 648          * on the space_info's groups_sem semaphore.
 649          * Decremented when an ordered extent that represents an IO against this
 650          * block group's range is created (after it's added to its inode's
 651          * root's list of ordered extents) or immediately after the allocation
 652          * if it's a metadata extent or fallocate extent (for these cases we
 653          * don't create ordered extents).
 654          */
 655         atomic_t reservations;
 656
 657         /*
 658          * Incremented while holding the spinlock *lock* by a task checking if
 659          * it can perform a nocow write (incremented if the value for the *ro*
 660          * field is 0). Decremented by such tasks once they create an ordered
 661          * extent or before that if some error happens before reaching that step.
 662          * This is to prevent races between block group relocation and nocow
 663          * writes through direct IO.
 664          */
 665         atomic_t nocow_writers;
 666
 667         /* Lock for free space tree operations. */
 668         struct mutex free_space_lock;
 669
 670         /*
 671          * Does the block group need to be added to the free space tree?
 672          * Protected by free_space_lock.
 673          */
 674         int needs_free_space;
 675
 676         /* Record locked full stripes for RAID5/6 block group */
 677         struct btrfs_full_stripe_locks_tree full_stripe_locks_root;
 678 };
 679
 680 /* delayed seq elem */
 681 struct seq_list {
 682         struct list_head list;
 683         u64 seq;
 684 };
 685
 686 #define SEQ_LIST_INIT(name)     { .list = LIST_HEAD_INIT((name).list), .seq = 0 }
 687
 688 #define SEQ_LAST        ((u64)-1)
 689
 690 enum btrfs_orphan_cleanup_state {
 691         ORPHAN_CLEANUP_STARTED  = 1,
 692         ORPHAN_CLEANUP_DONE     = 2,
 693 };
 694
 695 /* used by the raid56 code to lock stripes for read/modify/write */
 696 struct btrfs_stripe_hash {
 697         struct list_head hash_list;
 698         spinlock_t lock;
 699 };
 700
 701 /* used by the raid56 code to lock stripes for read/modify/write */
 702 struct btrfs_stripe_hash_table {
 703         struct list_head stripe_cache;
 704         spinlock_t cache_lock;
 705         int cache_size;
 706         struct btrfs_stripe_hash table[];
 707 };
 708
 709 #define BTRFS_STRIPE_HASH_TABLE_BITS 11
 710
 711 void btrfs_init_async_reclaim_work(struct work_struct *work);
 712
 713 /* fs_info */
 714 struct reloc_control;
 715 struct btrfs_device;
 716 struct btrfs_fs_devices;
 717 struct btrfs_balance_control;
 718 struct btrfs_delayed_root;
 719
 720 #define BTRFS_FS_BARRIER                        1
 721 #define BTRFS_FS_CLOSING_START                  2
 722 #define BTRFS_FS_CLOSING_DONE                   3
 723 #define BTRFS_FS_LOG_RECOVERING                 4
 724 #define BTRFS_FS_OPEN                           5
 725 #define BTRFS_FS_QUOTA_ENABLED                  6
 726 #define BTRFS_FS_UPDATE_UUID_TREE_GEN           9
 727 #define BTRFS_FS_CREATING_FREE_SPACE_TREE       10
 728 #define BTRFS_FS_BTREE_ERR                      11
 729 #define BTRFS_FS_LOG1_ERR                       12
 730 #define BTRFS_FS_LOG2_ERR                       13
 731 #define BTRFS_FS_QUOTA_OVERRIDE                 14
 732 /* Used to record internally whether fs has been frozen */
 733 #define BTRFS_FS_FROZEN                         15
 734
 735 /*
 736  * Indicate that a whole-filesystem exclusive operation is running
 737  * (device replace, resize, device add/delete, balance)
 738  */
 739 #define BTRFS_FS_EXCL_OP                        16
 740
 741 /*
 742  * To info transaction_kthread we need an immediate commit so it doesn't
 743  * need to wait for commit_interval
 744  */
 745 #define BTRFS_FS_NEED_ASYNC_COMMIT              17
 746
 747 /*
 748  * Indicate that balance has been set up from the ioctl and is in the main
 749  * phase. The fs_info::balance_ctl is initialized.
 750  */
 751 #define BTRFS_FS_BALANCE_RUNNING                18
 752
 753 struct btrfs_fs_info {
 754         u8 fsid[BTRFS_FSID_SIZE];
 755         u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
 756         unsigned long flags;
 757         struct btrfs_root *extent_root;
 758         struct btrfs_root *tree_root;
 759         struct btrfs_root *chunk_root;
 760         struct btrfs_root *dev_root;
 761         struct btrfs_root *fs_root;
 762         struct btrfs_root *csum_root;
 763         struct btrfs_root *quota_root;
 764         struct btrfs_root *uuid_root;
 765         struct btrfs_root *free_space_root;
 766
 767         /* the log root tree is a directory of all the other log roots */
 768         struct btrfs_root *log_root_tree;
 769
 770         spinlock_t fs_roots_radix_lock;
 771         struct radix_tree_root fs_roots_radix;
 772
 773         /* block group cache stuff */
 774         spinlock_t block_group_cache_lock;
 775         u64 first_logical_byte;
 776         struct rb_root block_group_cache_tree;
 777
 778         /* keep track of unallocated space */
 779         atomic64_t free_chunk_space;
 780
 781         struct extent_io_tree freed_extents[2];
 782         struct extent_io_tree *pinned_extents;
 783
 784         /* logical->physical extent mapping */
 785         struct btrfs_mapping_tree mapping_tree;
 786
 787         /*
 788          * block reservation for extent, checksum, root tree and
 789          * delayed dir index item
 790          */
 791         struct btrfs_block_rsv global_block_rsv;
 792         /* block reservation for metadata operations */
 793         struct btrfs_block_rsv trans_block_rsv;
 794         /* block reservation for chunk tree */
 795         struct btrfs_block_rsv chunk_block_rsv;
 796         /* block reservation for delayed operations */
 797         struct btrfs_block_rsv delayed_block_rsv;
 798
 799         struct btrfs_block_rsv empty_block_rsv;
 800
 801         u64 generation;
 802         u64 last_trans_committed;
 803         u64 avg_delayed_ref_runtime;
 804
 805         /*
 806          * this is updated to the current trans every time a full commit
 807          * is required instead of the faster short fsync log commits
 808          */
 809         u64 last_trans_log_full_commit;
 810         unsigned long mount_opt;
 811         /*
 812          * Track requests for actions that need to be done during transaction
 813          * commit (like for some mount options).
 814          */
 815         unsigned long pending_changes;
 816         unsigned long compress_type:4;
 817         unsigned int compress_level;
 818         u32 commit_interval;
 819         /*
 820          * It is a suggestive number, the read side is safe even it gets a
 821          * wrong number because we will write out the data into a regular
 822          * extent. The write side(mount/remount) is under ->s_umount lock,
 823          * so it is also safe.
 824          */
 825         u64 max_inline;
 826
 827         struct btrfs_transaction *running_transaction;
 828         wait_queue_head_t transaction_throttle;
 829         wait_queue_head_t transaction_wait;
 830         wait_queue_head_t transaction_blocked_wait;
 831         wait_queue_head_t async_submit_wait;
 832
 833         /*
 834          * Used to protect the incompat_flags, compat_flags, compat_ro_flags
 835          * when they are updated.
 836          *
 837          * Because we do not clear the flags for ever, so we needn't use
 838          * the lock on the read side.
 839          *
 840          * We also needn't use the lock when we mount the fs, because
 841          * there is no other task which will update the flag.
 842          */
 843         spinlock_t super_lock;
 844         struct btrfs_super_block *super_copy;
 845         struct btrfs_super_block *super_for_commit;
 846         struct super_block *sb;
 847         struct inode *btree_inode;
 848         struct mutex tree_log_mutex;
 849         struct mutex transaction_kthread_mutex;
 850         struct mutex cleaner_mutex;
 851         struct mutex chunk_mutex;
 852
 853         /*
 854          * this is taken to make sure we don't set block groups ro after
 855          * the free space cache has been allocated on them
 856          */
 857         struct mutex ro_block_group_mutex;
 858
 859         /* this is used during read/modify/write to make sure
 860          * no two ios are trying to mod the same stripe at the same
 861          * time
 862          */
 863         struct btrfs_stripe_hash_table *stripe_hash_table;
 864
 865         /*
 866          * this protects the ordered operations list only while we are
 867          * processing all of the entries on it.  This way we make
 868          * sure the commit code doesn't find the list temporarily empty
 869          * because another function happens to be doing non-waiting preflush
 870          * before jumping into the main commit.
 871          */
 872         struct mutex ordered_operations_mutex;
 873
 874         struct rw_semaphore commit_root_sem;
 875
 876         struct rw_semaphore cleanup_work_sem;
 877
 878         struct rw_semaphore subvol_sem;
 879         struct srcu_struct subvol_srcu;
 880
 881         spinlock_t trans_lock;
 882         /*
 883          * the reloc mutex goes with the trans lock, it is taken
 884          * during commit to protect us from the relocation code
 885          */
 886         struct mutex reloc_mutex;
 887
 888         struct list_head trans_list;
 889         struct list_head dead_roots;
 890         struct list_head caching_block_groups;
 891
 892         spinlock_t delayed_iput_lock;
 893         struct list_head delayed_iputs;
 894         struct mutex cleaner_delayed_iput_mutex;
 895
 896         atomic64_t tree_mod_seq;
 897
 898         /* this protects tree_mod_log and tree_mod_seq_list */
 899         rwlock_t tree_mod_log_lock;
 900         struct rb_root tree_mod_log;
 901         struct list_head tree_mod_seq_list;
 902
 903         atomic_t async_delalloc_pages;
 904
 905         /*
 906          * this is used to protect the following list -- ordered_roots.
 907          */
 908         spinlock_t ordered_root_lock;
 909
 910         /*
 911          * all fs/file tree roots in which there are data=ordered extents
 912          * pending writeback are added into this list.
 913          *
 914          * these can span multiple transactions and basically include
 915          * every dirty data page that isn't from nodatacow
 916          */
 917         struct list_head ordered_roots;
 918
 919         struct mutex delalloc_root_mutex;
 920         spinlock_t delalloc_root_lock;
 921         /* all fs/file tree roots that have delalloc inodes. */
 922         struct list_head delalloc_roots;
 923
 924         /*
 925          * there is a pool of worker threads for checksumming during writes
 926          * and a pool for checksumming after reads.  This is because readers
 927          * can run with FS locks held, and the writers may be waiting for
 928          * those locks.  We don't want ordering in the pending list to cause
 929          * deadlocks, and so the two are serviced separately.
 930          *
 931          * A third pool does submit_bio to avoid deadlocking with the other
 932          * two
 933          */
 934         struct btrfs_workqueue *workers;
 935         struct btrfs_workqueue *delalloc_workers;
 936         struct btrfs_workqueue *flush_workers;
 937         struct btrfs_workqueue *endio_workers;
 938         struct btrfs_workqueue *endio_meta_workers;
 939         struct btrfs_workqueue *endio_raid56_workers;
 940         struct btrfs_workqueue *endio_repair_workers;
 941         struct btrfs_workqueue *rmw_workers;
 942         struct btrfs_workqueue *endio_meta_write_workers;
 943         struct btrfs_workqueue *endio_write_workers;
 944         struct btrfs_workqueue *endio_freespace_worker;
 945         struct btrfs_workqueue *submit_workers;
 946         struct btrfs_workqueue *caching_workers;
 947         struct btrfs_workqueue *readahead_workers;
 948
 949         /*
 950          * fixup workers take dirty pages that didn't properly go through
 951          * the cow mechanism and make them safe to write.  It happens
 952          * for the sys_munmap function call path
 953          */
 954         struct btrfs_workqueue *fixup_workers;
 955         struct btrfs_workqueue *delayed_workers;
 956
 957         /* the extent workers do delayed refs on the extent allocation tree */
 958         struct btrfs_workqueue *extent_workers;
 959         struct task_struct *transaction_kthread;
 960         struct task_struct *cleaner_kthread;
 961         u32 thread_pool_size;
 962
 963         struct kobject *space_info_kobj;
 964         struct list_head pending_raid_kobjs;
 965         spinlock_t pending_raid_kobjs_lock; /* uncontended */
 966
 967         u64 total_pinned;
 968
 969         /* used to keep from writing metadata until there is a nice batch */
 970         struct percpu_counter dirty_metadata_bytes;
 971         struct percpu_counter delalloc_bytes;
 972         s32 dirty_metadata_batch;
 973         s32 delalloc_batch;
 974
 975         struct list_head dirty_cowonly_roots;
 976
 977         struct btrfs_fs_devices *fs_devices;
 978
 979         /*
 980          * The space_info list is effectively read only after initial
 981          * setup.  It is populated at mount time and cleaned up after
 982          * all block groups are removed.  RCU is used to protect it.
 983          */
 984         struct list_head space_info;
 985
 986         struct btrfs_space_info *data_sinfo;
 987
 988         struct reloc_control *reloc_ctl;
 989
 990         /* data_alloc_cluster is only used in ssd_spread mode */
 991         struct btrfs_free_cluster data_alloc_cluster;
 992
 993         /* all metadata allocations go through this cluster */
 994         struct btrfs_free_cluster meta_alloc_cluster;
 995
 996         /* auto defrag inodes go here */
 997         spinlock_t defrag_inodes_lock;
 998         struct rb_root defrag_inodes;
 999         atomic_t defrag_running;
1000
1001         /* Used to protect avail_{data, metadata, system}_alloc_bits */
1002         seqlock_t profiles_lock;
1003         /*
1004          * these three are in extended format (availability of single
1005          * chunks is denoted by BTRFS_AVAIL_ALLOC_BIT_SINGLE bit, other
1006          * types are denoted by corresponding BTRFS_BLOCK_GROUP_* bits)
1007          */
1008         u64 avail_data_alloc_bits;
1009         u64 avail_metadata_alloc_bits;
1010         u64 avail_system_alloc_bits;
1011
1012         /* restriper state */
1013         spinlock_t balance_lock;
1014         struct mutex balance_mutex;
1015         atomic_t balance_pause_req;
1016         atomic_t balance_cancel_req;
1017         struct btrfs_balance_control *balance_ctl;
1018         wait_queue_head_t balance_wait_q;
1019
1020         u32 data_chunk_allocations;
1021         u32 metadata_ratio;
1022
1023         void *bdev_holder;
1024
1025         /* private scrub information */
1026         struct mutex scrub_lock;
1027         atomic_t scrubs_running;
1028         atomic_t scrub_pause_req;
1029         atomic_t scrubs_paused;
1030         atomic_t scrub_cancel_req;
1031         wait_queue_head_t scrub_pause_wait;
1032         int scrub_workers_refcnt;
1033         struct btrfs_workqueue *scrub_workers;
1034         struct btrfs_workqueue *scrub_wr_completion_workers;
1035         struct btrfs_workqueue *scrub_nocow_workers;
1036         struct btrfs_workqueue *scrub_parity_workers;
1037
1038 #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY
1039         u32 check_integrity_print_mask;
1040 #endif
1041         /* is qgroup tracking in a consistent state? */
1042         u64 qgroup_flags;
1043
1044         /* holds configuration and tracking. Protected by qgroup_lock */
1045         struct rb_root qgroup_tree;
1046         struct rb_root qgroup_op_tree;
1047         spinlock_t qgroup_lock;
1048         spinlock_t qgroup_op_lock;
1049         atomic_t qgroup_op_seq;
1050
1051         /*
1052          * used to avoid frequently calling ulist_alloc()/ulist_free()
1053          * when doing qgroup accounting, it must be protected by qgroup_lock.
1054          */
1055         struct ulist *qgroup_ulist;
1056
1057         /* protect user change for quota operations */
1058         struct mutex qgroup_ioctl_lock;
1059
1060         /* list of dirty qgroups to be written at next commit */
1061         struct list_head dirty_qgroups;
1062
1063         /* used by qgroup for an efficient tree traversal */
1064         u64 qgroup_seq;
1065
1066         /* qgroup rescan items */
1067         struct mutex qgroup_rescan_lock; /* protects the progress item */
1068         struct btrfs_key qgroup_rescan_progress;
1069         struct btrfs_workqueue *qgroup_rescan_workers;
1070         struct completion qgroup_rescan_completion;
1071         struct btrfs_work qgroup_rescan_work;
1072         bool qgroup_rescan_running;     /* protected by qgroup_rescan_lock */
1073
1074         /* filesystem state */
1075         unsigned long fs_state;
1076
1077         struct btrfs_delayed_root *delayed_root;
1078
1079         /* readahead tree */
1080         spinlock_t reada_lock;
1081         struct radix_tree_root reada_tree;
1082
1083         /* readahead works cnt */
1084         atomic_t reada_works_cnt;
1085
1086         /* Extent buffer radix tree */
1087         spinlock_t buffer_lock;
1088         struct radix_tree_root buffer_radix;
1089
1090         /* next backup root to be overwritten */
1091         int backup_root_index;
1092
1093         /* device replace state */
1094         struct btrfs_dev_replace dev_replace;
1095
1096         struct percpu_counter bio_counter;
1097         wait_queue_head_t replace_wait;
1098
1099         struct semaphore uuid_tree_rescan_sem;
1100
1101         /* Used to reclaim the metadata space in the background. */
1102         struct work_struct async_reclaim_work;
1103
1104         spinlock_t unused_bgs_lock;
1105         struct list_head unused_bgs;
1106         struct mutex unused_bg_unpin_mutex;
1107         struct mutex delete_unused_bgs_mutex;
1108
1109         /* For btrfs to record security options */
1110         struct security_mnt_opts security_opts;
1111
1112         /*
1113          * Chunks that can't be freed yet (under a trim/discard operation)
1114          * and will be latter freed. Protected by fs_info->chunk_mutex.
1115          */
1116         struct list_head pinned_chunks;
1117
1118         /* Cached block sizes */
1119         u32 nodesize;
1120         u32 sectorsize;
1121         u32 stripesize;
1122
1123 #ifdef CONFIG_BTRFS_FS_REF_VERIFY
1124         spinlock_t ref_verify_lock;
1125         struct rb_root block_tree;
1126 #endif
1127 };
1128
1129 static inline struct btrfs_fs_info *btrfs_sb(struct super_block *sb)
1130 {
1131         return sb->s_fs_info;
1132 }
1133
1134 struct btrfs_subvolume_writers {
1135         struct percpu_counter   counter;
1136         wait_queue_head_t       wait;
1137 };
1138
1139 /*
1140  * The state of btrfs root
1141  */
1142 /*
1143  * btrfs_record_root_in_trans is a multi-step process,
1144  * and it can race with the balancing code.   But the
1145  * race is very small, and only the first time the root
1146  * is added to each transaction.  So IN_TRANS_SETUP
1147  * is used to tell us when more checks are required
1148  */
1149 #define BTRFS_ROOT_IN_TRANS_SETUP       0
1150 #define BTRFS_ROOT_REF_COWS             1
1151 #define BTRFS_ROOT_TRACK_DIRTY          2
1152 #define BTRFS_ROOT_IN_RADIX             3
1153 #define BTRFS_ROOT_ORPHAN_ITEM_INSERTED 4
1154 #define BTRFS_ROOT_DEFRAG_RUNNING       5
1155 #define BTRFS_ROOT_FORCE_COW            6
1156 #define BTRFS_ROOT_MULTI_LOG_TASKS      7
1157 #define BTRFS_ROOT_DIRTY                8
1158
1159 /*
1160  * in ram representation of the tree.  extent_root is used for all allocations
1161  * and for the extent tree extent_root root.
1162  */
1163 struct btrfs_root {
1164         struct extent_buffer *node;
1165
1166         struct extent_buffer *commit_root;
1167         struct btrfs_root *log_root;
1168         struct btrfs_root *reloc_root;
1169
1170         unsigned long state;
1171         struct btrfs_root_item root_item;
1172         struct btrfs_key root_key;
1173         struct btrfs_fs_info *fs_info;
1174         struct extent_io_tree dirty_log_pages;
1175
1176         struct mutex objectid_mutex;
1177
1178         spinlock_t accounting_lock;
1179         struct btrfs_block_rsv *block_rsv;
1180
1181         /* free ino cache stuff */
1182         struct btrfs_free_space_ctl *free_ino_ctl;
1183         enum btrfs_caching_type ino_cache_state;
1184         spinlock_t ino_cache_lock;
1185         wait_queue_head_t ino_cache_wait;
1186         struct btrfs_free_space_ctl *free_ino_pinned;
1187         u64 ino_cache_progress;
1188         struct inode *ino_cache_inode;
1189
1190         struct mutex log_mutex;
1191         wait_queue_head_t log_writer_wait;
1192         wait_queue_head_t log_commit_wait[2];
1193         struct list_head log_ctxs[2];
1194         atomic_t log_writers;
1195         atomic_t log_commit[2];
1196         atomic_t log_batch;
1197         int log_transid;
1198         /* No matter the commit succeeds or not*/
1199         int log_transid_committed;
1200         /* Just be updated when the commit succeeds. */
1201         int last_log_commit;
1202         pid_t log_start_pid;
1203
1204         u64 objectid;
1205         u64 last_trans;
1206
1207         u32 type;
1208
1209         u64 highest_objectid;
1210
1211 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
1212         /* only used with CONFIG_BTRFS_FS_RUN_SANITY_TESTS is enabled */
1213         u64 alloc_bytenr;
1214 #endif
1215
1216         u64 defrag_trans_start;
1217         struct btrfs_key defrag_progress;
1218         struct btrfs_key defrag_max;
1219
1220         /* the dirty list is only used by non-reference counted roots */
1221         struct list_head dirty_list;
1222
1223         struct list_head root_list;
1224
1225         spinlock_t log_extents_lock[2];
1226         struct list_head logged_list[2];
1227
1228         int orphan_cleanup_state;
1229
1230         spinlock_t inode_lock;
1231         /* red-black tree that keeps track of in-memory inodes */
1232         struct rb_root inode_tree;
1233
1234         /*
1235          * radix tree that keeps track of delayed nodes of every inode,
1236          * protected by inode_lock
1237          */
1238         struct radix_tree_root delayed_nodes_tree;
1239         /*
1240          * right now this just gets used so that a root has its own devid
1241          * for stat.  It may be used for more later
1242          */
1243         dev_t anon_dev;
1244
1245         spinlock_t root_item_lock;
1246         refcount_t refs;
1247
1248         struct mutex delalloc_mutex;
1249         spinlock_t delalloc_lock;
1250         /*
1251          * all of the inodes that have delalloc bytes.  It is possible for
1252          * this list to be empty even when there is still dirty data=ordered
1253          * extents waiting to finish IO.
1254          */
1255         struct list_head delalloc_inodes;
1256         struct list_head delalloc_root;
1257         u64 nr_delalloc_inodes;
1258
1259         struct mutex ordered_extent_mutex;
1260         /*
1261          * this is used by the balancing code to wait for all the pending
1262          * ordered extents
1263          */
1264         spinlock_t ordered_extent_lock;
1265
1266         /*
1267          * all of the data=ordered extents pending writeback
1268          * these can span multiple transactions and basically include
1269          * every dirty data page that isn't from nodatacow
1270          */
1271         struct list_head ordered_extents;
1272         struct list_head ordered_root;
1273         u64 nr_ordered_extents;
1274
1275         /*
1276          * Number of currently running SEND ioctls to prevent
1277          * manipulation with the read-only status via SUBVOL_SETFLAGS
1278          */
1279         int send_in_progress;
1280         struct btrfs_subvolume_writers *subv_writers;
1281         atomic_t will_be_snapshotted;
1282         atomic_t snapshot_force_cow;
1283
1284         /* For qgroup metadata reserved space */
1285         spinlock_t qgroup_meta_rsv_lock;
1286         u64 qgroup_meta_rsv_pertrans;
1287         u64 qgroup_meta_rsv_prealloc;
1288 };
1289
1290 struct btrfs_file_private {
1291         void *filldir_buf;
1292 };
1293
1294 static inline u32 btrfs_inode_sectorsize(const struct inode *inode)
1295 {
1296         return btrfs_sb(inode->i_sb)->sectorsize;
1297 }
1298
1299 static inline u32 BTRFS_LEAF_DATA_SIZE(const struct btrfs_fs_info *info)
1300 {
1301
1302         return info->nodesize - sizeof(struct btrfs_header);
1303 }
1304
1305 #define BTRFS_LEAF_DATA_OFFSET          offsetof(struct btrfs_leaf, items)
1306
1307 static inline u32 BTRFS_MAX_ITEM_SIZE(const struct btrfs_fs_info *info)
1308 {
1309         return BTRFS_LEAF_DATA_SIZE(info) - sizeof(struct btrfs_item);
1310 }
1311
1312 static inline u32 BTRFS_NODEPTRS_PER_BLOCK(const struct btrfs_fs_info *info)
1313 {
1314         return BTRFS_LEAF_DATA_SIZE(info) / sizeof(struct btrfs_key_ptr);
1315 }
1316
1317 #define BTRFS_FILE_EXTENT_INLINE_DATA_START             \
1318                 (offsetof(struct btrfs_file_extent_item, disk_bytenr))
1319 static inline u32 BTRFS_MAX_INLINE_DATA_SIZE(const struct btrfs_fs_info *info)
1320 {
1321         return BTRFS_MAX_ITEM_SIZE(info) -
1322                BTRFS_FILE_EXTENT_INLINE_DATA_START;
1323 }
1324
1325 static inline u32 BTRFS_MAX_XATTR_SIZE(const struct btrfs_fs_info *info)
1326 {
1327         return BTRFS_MAX_ITEM_SIZE(info) - sizeof(struct btrfs_dir_item);
1328 }
1329
1330 /*
1331  * Flags for mount options.
1332  *
1333  * Note: don't forget to add new options to btrfs_show_options()
1334  */
1335 #define BTRFS_MOUNT_NODATASUM           (1 << 0)
1336 #define BTRFS_MOUNT_NODATACOW           (1 << 1)
1337 #define BTRFS_MOUNT_NOBARRIER           (1 << 2)
1338 #define BTRFS_MOUNT_SSD                 (1 << 3)
1339 #define BTRFS_MOUNT_DEGRADED            (1 << 4)
1340 #define BTRFS_MOUNT_COMPRESS            (1 << 5)
1341 #define BTRFS_MOUNT_NOTREELOG           (1 << 6)
1342 #define BTRFS_MOUNT_FLUSHONCOMMIT       (1 << 7)
1343 #define BTRFS_MOUNT_SSD_SPREAD          (1 << 8)
1344 #define BTRFS_MOUNT_NOSSD               (1 << 9)
1345 #define BTRFS_MOUNT_DISCARD             (1 << 10)
1346 #define BTRFS_MOUNT_FORCE_COMPRESS      (1 << 11)
1347 #define BTRFS_MOUNT_SPACE_CACHE         (1 << 12)
1348 #define BTRFS_MOUNT_CLEAR_CACHE         (1 << 13)
1349 #define BTRFS_MOUNT_USER_SUBVOL_RM_ALLOWED (1 << 14)
1350 #define BTRFS_MOUNT_ENOSPC_DEBUG         (1 << 15)
1351 #define BTRFS_MOUNT_AUTO_DEFRAG         (1 << 16)
1352 #define BTRFS_MOUNT_INODE_MAP_CACHE     (1 << 17)
1353 #define BTRFS_MOUNT_USEBACKUPROOT       (1 << 18)
1354 #define BTRFS_MOUNT_SKIP_BALANCE        (1 << 19)
1355 #define BTRFS_MOUNT_CHECK_INTEGRITY     (1 << 20)
1356 #define BTRFS_MOUNT_CHECK_INTEGRITY_INCLUDING_EXTENT_DATA (1 << 21)
1357 #define BTRFS_MOUNT_PANIC_ON_FATAL_ERROR        (1 << 22)
1358 #define BTRFS_MOUNT_RESCAN_UUID_TREE    (1 << 23)
1359 #define BTRFS_MOUNT_FRAGMENT_DATA       (1 << 24)
1360 #define BTRFS_MOUNT_FRAGMENT_METADATA   (1 << 25)
1361 #define BTRFS_MOUNT_FREE_SPACE_TREE     (1 << 26)
1362 #define BTRFS_MOUNT_NOLOGREPLAY         (1 << 27)
1363 #define BTRFS_MOUNT_REF_VERIFY          (1 << 28)
1364
1365 #define BTRFS_DEFAULT_COMMIT_INTERVAL   (30)
1366 #define BTRFS_DEFAULT_MAX_INLINE        (2048)
1367
1368 #define btrfs_clear_opt(o, opt)         ((o) &= ~BTRFS_MOUNT_##opt)
1369 #define btrfs_set_opt(o, opt)           ((o) |= BTRFS_MOUNT_##opt)
1370 #define btrfs_raw_test_opt(o, opt)      ((o) & BTRFS_MOUNT_##opt)
1371 #define btrfs_test_opt(fs_info, opt)    ((fs_info)->mount_opt & \
1372                                          BTRFS_MOUNT_##opt)
1373
1374 #define btrfs_set_and_info(fs_info, opt, fmt, args...)                  \
1375 {                                                                       \
1376         if (!btrfs_test_opt(fs_info, opt))                              \
1377                 btrfs_info(fs_info, fmt, ##args);                       \
1378         btrfs_set_opt(fs_info->mount_opt, opt);                         \
1379 }
1380
1381 #define btrfs_clear_and_info(fs_info, opt, fmt, args...)                \
1382 {                                                                       \
1383         if (btrfs_test_opt(fs_info, opt))                               \
1384                 btrfs_info(fs_info, fmt, ##args);                       \
1385         btrfs_clear_opt(fs_info->mount_opt, opt);                       \
1386 }
1387
1388 #ifdef CONFIG_BTRFS_DEBUG
1389 static inline int
1390 btrfs_should_fragment_free_space(struct btrfs_block_group_cache *block_group)
1391 {
1392         struct btrfs_fs_info *fs_info = block_group->fs_info;
1393
1394         return (btrfs_test_opt(fs_info, FRAGMENT_METADATA) &&
1395                 block_group->flags & BTRFS_BLOCK_GROUP_METADATA) ||
1396                (btrfs_test_opt(fs_info, FRAGMENT_DATA) &&
1397                 block_group->flags &  BTRFS_BLOCK_GROUP_DATA);
1398 }
1399 #endif
1400
1401 /*
1402  * Requests for changes that need to be done during transaction commit.
1403  *
1404  * Internal mount options that are used for special handling of the real
1405  * mount options (eg. cannot be set during remount and have to be set during
1406  * transaction commit)
1407  */
1408
1409 #define BTRFS_PENDING_SET_INODE_MAP_CACHE       (0)
1410 #define BTRFS_PENDING_CLEAR_INODE_MAP_CACHE     (1)
1411 #define BTRFS_PENDING_COMMIT                    (2)
1412
1413 #define btrfs_test_pending(info, opt)   \
1414         test_bit(BTRFS_PENDING_##opt, &(info)->pending_changes)
1415 #define btrfs_set_pending(info, opt)    \
1416         set_bit(BTRFS_PENDING_##opt, &(info)->pending_changes)
1417 #define btrfs_clear_pending(info, opt)  \
1418         clear_bit(BTRFS_PENDING_##opt, &(info)->pending_changes)
1419
1420 /*
1421  * Helpers for setting pending mount option changes.
1422  *
1423  * Expects corresponding macros
1424  * BTRFS_PENDING_SET_ and CLEAR_ + short mount option name
1425  */
1426 #define btrfs_set_pending_and_info(info, opt, fmt, args...)            \
1427 do {                                                                   \
1428        if (!btrfs_raw_test_opt((info)->mount_opt, opt)) {              \
1429                btrfs_info((info), fmt, ##args);                        \
1430                btrfs_set_pending((info), SET_##opt);                   \
1431                btrfs_clear_pending((info), CLEAR_##opt);               \
1432        }                                                               \
1433 } while(0)
1434
1435 #define btrfs_clear_pending_and_info(info, opt, fmt, args...)          \
1436 do {                                                                   \
1437        if (btrfs_raw_test_opt((info)->mount_opt, opt)) {               \
1438                btrfs_info((info), fmt, ##args);                        \
1439                btrfs_set_pending((info), CLEAR_##opt);                 \
1440                btrfs_clear_pending((info), SET_##opt);                 \
1441        }                                                               \
1442 } while(0)
1443
1444 /*
1445  * Inode flags
1446  */
1447 #define BTRFS_INODE_NODATASUM           (1 << 0)
1448 #define BTRFS_INODE_NODATACOW           (1 << 1)
1449 #define BTRFS_INODE_READONLY            (1 << 2)
1450 #define BTRFS_INODE_NOCOMPRESS          (1 << 3)
1451 #define BTRFS_INODE_PREALLOC            (1 << 4)
1452 #define BTRFS_INODE_SYNC                (1 << 5)
1453 #define BTRFS_INODE_IMMUTABLE           (1 << 6)
1454 #define BTRFS_INODE_APPEND              (1 << 7)
1455 #define BTRFS_INODE_NODUMP              (1 << 8)
1456 #define BTRFS_INODE_NOATIME             (1 << 9)
1457 #define BTRFS_INODE_DIRSYNC             (1 << 10)
1458 #define BTRFS_INODE_COMPRESS            (1 << 11)
1459
1460 #define BTRFS_INODE_ROOT_ITEM_INIT      (1 << 31)
1461
1462 struct btrfs_map_token {
1463         const struct extent_buffer *eb;
1464         char *kaddr;
1465         unsigned long offset;
1466 };
1467
1468 #define BTRFS_BYTES_TO_BLKS(fs_info, bytes) \
1469                                 ((bytes) >> (fs_info)->sb->s_blocksize_bits)
1470
1471 static inline void btrfs_init_map_token (struct btrfs_map_token *token)
1472 {
1473         token->kaddr = NULL;
1474 }
1475
1476 /* some macros to generate set/get functions for the struct fields.  This
1477  * assumes there is a lefoo_to_cpu for every type, so lets make a simple
1478  * one for u8:
1479  */
1480 #define le8_to_cpu(v) (v)
1481 #define cpu_to_le8(v) (v)
1482 #define __le8 u8
1483
1484 #define read_eb_member(eb, ptr, type, member, result) (\
1485         read_extent_buffer(eb, (char *)(result),                        \
1486                            ((unsigned long)(ptr)) +                     \
1487                             offsetof(type, member),                     \
1488                            sizeof(((type *)0)->member)))
1489
1490 #define write_eb_member(eb, ptr, type, member, result) (\
1491         write_extent_buffer(eb, (char *)(result),                       \
1492                            ((unsigned long)(ptr)) +                     \
1493                             offsetof(type, member),                     \
1494                            sizeof(((type *)0)->member)))
1495
1496 #define DECLARE_BTRFS_SETGET_BITS(bits)                                 \
1497 u##bits btrfs_get_token_##bits(const struct extent_buffer *eb,          \
1498                                const void *ptr, unsigned long off,      \
1499                                struct btrfs_map_token *token);          \
1500 void btrfs_set_token_##bits(struct extent_buffer *eb, const void *ptr,  \
1501                             unsigned long off, u##bits val,             \
1502                             struct btrfs_map_token *token);             \
1503 static inline u##bits btrfs_get_##bits(const struct extent_buffer *eb,  \
1504                                        const void *ptr,                 \
1505                                        unsigned long off)               \
1506 {                                                                       \
1507         return btrfs_get_token_##bits(eb, ptr, off, NULL);              \
1508 }                                                                       \
1509 static inline void btrfs_set_##bits(struct extent_buffer *eb, void *ptr,\
1510                                     unsigned long off, u##bits val)     \
1511 {                                                                       \
1512        btrfs_set_token_##bits(eb, ptr, off, val, NULL);                 \
1513 }
1514
1515 DECLARE_BTRFS_SETGET_BITS(8)
1516 DECLARE_BTRFS_SETGET_BITS(16)
1517 DECLARE_BTRFS_SETGET_BITS(32)
1518 DECLARE_BTRFS_SETGET_BITS(64)
1519
1520 #define BTRFS_SETGET_FUNCS(name, type, member, bits)                    \
1521 static inline u##bits btrfs_##name(const struct extent_buffer *eb,      \
1522                                    const type *s)                       \
1523 {                                                                       \
1524         BUILD_BUG_ON(sizeof(u##bits) != sizeof(((type *)0))->member);   \
1525         return btrfs_get_##bits(eb, s, offsetof(type, member));         \
1526 }                                                                       \
1527 static inline void btrfs_set_##name(struct extent_buffer *eb, type *s,  \
1528                                     u##bits val)                        \
1529 {                                                                       \
1530         BUILD_BUG_ON(sizeof(u##bits) != sizeof(((type *)0))->member);   \
1531         btrfs_set_##bits(eb, s, offsetof(type, member), val);           \
1532 }                                                                       \
1533 static inline u##bits btrfs_token_##name(const struct extent_buffer *eb,\
1534                                          const type *s,                 \
1535                                          struct btrfs_map_token *token) \
1536 {                                                                       \
1537         BUILD_BUG_ON(sizeof(u##bits) != sizeof(((type *)0))->member);   \
1538         return btrfs_get_token_##bits(eb, s, offsetof(type, member), token); \
1539 }                                                                       \
1540 static inline void btrfs_set_token_##name(struct extent_buffer *eb,     \
1541                                           type *s, u##bits val,         \
1542                                          struct btrfs_map_token *token) \
1543 {                                                                       \
1544         BUILD_BUG_ON(sizeof(u##bits) != sizeof(((type *)0))->member);   \
1545         btrfs_set_token_##bits(eb, s, offsetof(type, member), val, token); \
1546 }
1547
1548 #define BTRFS_SETGET_HEADER_FUNCS(name, type, member, bits)             \
1549 static inline u##bits btrfs_##name(const struct extent_buffer *eb)      \
1550 {                                                                       \
1551         const type *p = page_address(eb->pages[0]);                     \
1552         u##bits res = le##bits##_to_cpu(p->member);                     \
1553         return res;                                                     \
1554 }                                                                       \
1555 static inline void btrfs_set_##name(struct extent_buffer *eb,           \
1556                                     u##bits val)                        \
1557 {                                                                       \
1558         type *p = page_address(eb->pages[0]);                           \
1559         p->member = cpu_to_le##bits(val);                               \
1560 }
1561
1562 #define BTRFS_SETGET_STACK_FUNCS(name, type, member, bits)              \
1563 static inline u##bits btrfs_##name(const type *s)                       \
1564 {                                                                       \
1565         return le##bits##_to_cpu(s->member);                            \
1566 }                                                                       \
1567 static inline void btrfs_set_##name(type *s, u##bits val)               \
1568 {                                                                       \
1569         s->member = cpu_to_le##bits(val);                               \
1570 }
1571
1572
1573 static inline u64 btrfs_device_total_bytes(struct extent_buffer *eb,
1574                                            struct btrfs_dev_item *s)
1575 {
1576         BUILD_BUG_ON(sizeof(u64) !=
1577                      sizeof(((struct btrfs_dev_item *)0))->total_bytes);
1578         return btrfs_get_64(eb, s, offsetof(struct btrfs_dev_item,
1579                                             total_bytes));
1580 }
1581 static inline void btrfs_set_device_total_bytes(struct extent_buffer *eb,
1582                                                 struct btrfs_dev_item *s,
1583                                                 u64 val)
1584 {
1585         BUILD_BUG_ON(sizeof(u64) !=
1586                      sizeof(((struct btrfs_dev_item *)0))->total_bytes);
1587         WARN_ON(!IS_ALIGNED(val, eb->fs_info->sectorsize));
1588         btrfs_set_64(eb, s, offsetof(struct btrfs_dev_item, total_bytes), val);
1589 }
1590
1591
1592 BTRFS_SETGET_FUNCS(device_type, struct btrfs_dev_item, type, 64);
1593 BTRFS_SETGET_FUNCS(device_bytes_used, struct btrfs_dev_item, bytes_used, 64);
1594 BTRFS_SETGET_FUNCS(device_io_align, struct btrfs_dev_item, io_align, 32);
1595 BTRFS_SETGET_FUNCS(device_io_width, struct btrfs_dev_item, io_width, 32);
1596 BTRFS_SETGET_FUNCS(device_start_offset, struct btrfs_dev_item,
1597                    start_offset, 64);
1598 BTRFS_SETGET_FUNCS(device_sector_size, struct btrfs_dev_item, sector_size, 32);
1599 BTRFS_SETGET_FUNCS(device_id, struct btrfs_dev_item, devid, 64);
1600 BTRFS_SETGET_FUNCS(device_group, struct btrfs_dev_item, dev_group, 32);
1601 BTRFS_SETGET_FUNCS(device_seek_speed, struct btrfs_dev_item, seek_speed, 8);
1602 BTRFS_SETGET_FUNCS(device_bandwidth, struct btrfs_dev_item, bandwidth, 8);
1603 BTRFS_SETGET_FUNCS(device_generation, struct btrfs_dev_item, generation, 64);
1604
1605 BTRFS_SETGET_STACK_FUNCS(stack_device_type, struct btrfs_dev_item, type, 64);
1606 BTRFS_SETGET_STACK_FUNCS(stack_device_total_bytes, struct btrfs_dev_item,
1607                          total_bytes, 64);
1608 BTRFS_SETGET_STACK_FUNCS(stack_device_bytes_used, struct btrfs_dev_item,
1609                          bytes_used, 64);
1610 BTRFS_SETGET_STACK_FUNCS(stack_device_io_align, struct btrfs_dev_item,
1611                          io_align, 32);
1612 BTRFS_SETGET_STACK_FUNCS(stack_device_io_width, struct btrfs_dev_item,
1613                          io_width, 32);
1614 BTRFS_SETGET_STACK_FUNCS(stack_device_sector_size, struct btrfs_dev_item,
1615                          sector_size, 32);
1616 BTRFS_SETGET_STACK_FUNCS(stack_device_id, struct btrfs_dev_item, devid, 64);
1617 BTRFS_SETGET_STACK_FUNCS(stack_device_group, struct btrfs_dev_item,
1618                          dev_group, 32);
1619 BTRFS_SETGET_STACK_FUNCS(stack_device_seek_speed, struct btrfs_dev_item,
1620                          seek_speed, 8);
1621 BTRFS_SETGET_STACK_FUNCS(stack_device_bandwidth, struct btrfs_dev_item,
1622                          bandwidth, 8);
1623 BTRFS_SETGET_STACK_FUNCS(stack_device_generation, struct btrfs_dev_item,
1624                          generation, 64);
1625
1626 static inline unsigned long btrfs_device_uuid(struct btrfs_dev_item *d)
1627 {
1628         return (unsigned long)d + offsetof(struct btrfs_dev_item, uuid);
1629 }
1630
1631 static inline unsigned long btrfs_device_fsid(struct btrfs_dev_item *d)
1632 {
1633         return (unsigned long)d + offsetof(struct btrfs_dev_item, fsid);
1634 }
1635
1636 BTRFS_SETGET_FUNCS(chunk_length, struct btrfs_chunk, length, 64);
1637 BTRFS_SETGET_FUNCS(chunk_owner, struct btrfs_chunk, owner, 64);
1638 BTRFS_SETGET_FUNCS(chunk_stripe_len, struct btrfs_chunk, stripe_len, 64);
1639 BTRFS_SETGET_FUNCS(chunk_io_align, struct btrfs_chunk, io_align, 32);
1640 BTRFS_SETGET_FUNCS(chunk_io_width, struct btrfs_chunk, io_width, 32);
1641 BTRFS_SETGET_FUNCS(chunk_sector_size, struct btrfs_chunk, sector_size, 32);
1642 BTRFS_SETGET_FUNCS(chunk_type, struct btrfs_chunk, type, 64);
1643 BTRFS_SETGET_FUNCS(chunk_num_stripes, struct btrfs_chunk, num_stripes, 16);
1644 BTRFS_SETGET_FUNCS(chunk_sub_stripes, struct btrfs_chunk, sub_stripes, 16);
1645 BTRFS_SETGET_FUNCS(stripe_devid, struct btrfs_stripe, devid, 64);
1646 BTRFS_SETGET_FUNCS(stripe_offset, struct btrfs_stripe, offset, 64);
1647
1648 static inline char *btrfs_stripe_dev_uuid(struct btrfs_stripe *s)
1649 {
1650         return (char *)s + offsetof(struct btrfs_stripe, dev_uuid);
1651 }
1652
1653 BTRFS_SETGET_STACK_FUNCS(stack_chunk_length, struct btrfs_chunk, length, 64);
1654 BTRFS_SETGET_STACK_FUNCS(stack_chunk_owner, struct btrfs_chunk, owner, 64);
1655 BTRFS_SETGET_STACK_FUNCS(stack_chunk_stripe_len, struct btrfs_chunk,
1656                          stripe_len, 64);
1657 BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_align, struct btrfs_chunk,
1658                          io_align, 32);
1659 BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_width, struct btrfs_chunk,
1660                          io_width, 32);
1661 BTRFS_SETGET_STACK_FUNCS(stack_chunk_sector_size, struct btrfs_chunk,
1662                          sector_size, 32);
1663 BTRFS_SETGET_STACK_FUNCS(stack_chunk_type, struct btrfs_chunk, type, 64);
1664 BTRFS_SETGET_STACK_FUNCS(stack_chunk_num_stripes, struct btrfs_chunk,
1665                          num_stripes, 16);
1666 BTRFS_SETGET_STACK_FUNCS(stack_chunk_sub_stripes, struct btrfs_chunk,
1667                          sub_stripes, 16);
1668 BTRFS_SETGET_STACK_FUNCS(stack_stripe_devid, struct btrfs_stripe, devid, 64);
1669 BTRFS_SETGET_STACK_FUNCS(stack_stripe_offset, struct btrfs_stripe, offset, 64);
1670
1671 static inline struct btrfs_stripe *btrfs_stripe_nr(struct btrfs_chunk *c,
1672                                                    int nr)
1673 {
1674         unsigned long offset = (unsigned long)c;
1675         offset += offsetof(struct btrfs_chunk, stripe);
1676         offset += nr * sizeof(struct btrfs_stripe);
1677         return (struct btrfs_stripe *)offset;
1678 }
1679
1680 static inline char *btrfs_stripe_dev_uuid_nr(struct btrfs_chunk *c, int nr)
1681 {
1682         return btrfs_stripe_dev_uuid(btrfs_stripe_nr(c, nr));
1683 }
1684
1685 static inline u64 btrfs_stripe_offset_nr(struct extent_buffer *eb,
1686                                          struct btrfs_chunk *c, int nr)
1687 {
1688         return btrfs_stripe_offset(eb, btrfs_stripe_nr(c, nr));
1689 }
1690
1691 static inline u64 btrfs_stripe_devid_nr(struct extent_buffer *eb,
1692                                          struct btrfs_chunk *c, int nr)
1693 {
1694         return btrfs_stripe_devid(eb, btrfs_stripe_nr(c, nr));
1695 }
1696
1697 /* struct btrfs_block_group_item */
1698 BTRFS_SETGET_STACK_FUNCS(block_group_used, struct btrfs_block_group_item,
1699                          used, 64);
1700 BTRFS_SETGET_FUNCS(disk_block_group_used, struct btrfs_block_group_item,
1701                          used, 64);
1702 BTRFS_SETGET_STACK_FUNCS(block_group_chunk_objectid,
1703                         struct btrfs_block_group_item, chunk_objectid, 64);
1704
1705 BTRFS_SETGET_FUNCS(disk_block_group_chunk_objectid,
1706                    struct btrfs_block_group_item, chunk_objectid, 64);
1707 BTRFS_SETGET_FUNCS(disk_block_group_flags,
1708                    struct btrfs_block_group_item, flags, 64);
1709 BTRFS_SETGET_STACK_FUNCS(block_group_flags,
1710                         struct btrfs_block_group_item, flags, 64);
1711
1712 /* struct btrfs_free_space_info */
1713 BTRFS_SETGET_FUNCS(free_space_extent_count, struct btrfs_free_space_info,
1714                    extent_count, 32);
1715 BTRFS_SETGET_FUNCS(free_space_flags, struct btrfs_free_space_info, flags, 32);
1716
1717 /* struct btrfs_inode_ref */
1718 BTRFS_SETGET_FUNCS(inode_ref_name_len, struct btrfs_inode_ref, name_len, 16);
1719 BTRFS_SETGET_FUNCS(inode_ref_index, struct btrfs_inode_ref, index, 64);
1720
1721 /* struct btrfs_inode_extref */
1722 BTRFS_SETGET_FUNCS(inode_extref_parent, struct btrfs_inode_extref,
1723                    parent_objectid, 64);
1724 BTRFS_SETGET_FUNCS(inode_extref_name_len, struct btrfs_inode_extref,
1725                    name_len, 16);
1726 BTRFS_SETGET_FUNCS(inode_extref_index, struct btrfs_inode_extref, index, 64);
1727
1728 /* struct btrfs_inode_item */
1729 BTRFS_SETGET_FUNCS(inode_generation, struct btrfs_inode_item, generation, 64);
1730 BTRFS_SETGET_FUNCS(inode_sequence, struct btrfs_inode_item, sequence, 64);
1731 BTRFS_SETGET_FUNCS(inode_transid, struct btrfs_inode_item, transid, 64);
1732 BTRFS_SETGET_FUNCS(inode_size, struct btrfs_inode_item, size, 64);
1733 BTRFS_SETGET_FUNCS(inode_nbytes, struct btrfs_inode_item, nbytes, 64);
1734 BTRFS_SETGET_FUNCS(inode_block_group, struct btrfs_inode_item, block_group, 64);
1735 BTRFS_SETGET_FUNCS(inode_nlink, struct btrfs_inode_item, nlink, 32);
1736 BTRFS_SETGET_FUNCS(inode_uid, struct btrfs_inode_item, uid, 32);
1737 BTRFS_SETGET_FUNCS(inode_gid, struct btrfs_inode_item, gid, 32);
1738 BTRFS_SETGET_FUNCS(inode_mode, struct btrfs_inode_item, mode, 32);
1739 BTRFS_SETGET_FUNCS(inode_rdev, struct btrfs_inode_item, rdev, 64);
1740 BTRFS_SETGET_FUNCS(inode_flags, struct btrfs_inode_item, flags, 64);
1741 BTRFS_SETGET_STACK_FUNCS(stack_inode_generation, struct btrfs_inode_item,
1742                          generation, 64);
1743 BTRFS_SETGET_STACK_FUNCS(stack_inode_sequence, struct btrfs_inode_item,
1744                          sequence, 64);
1745 BTRFS_SETGET_STACK_FUNCS(stack_inode_transid, struct btrfs_inode_item,
1746                          transid, 64);
1747 BTRFS_SETGET_STACK_FUNCS(stack_inode_size, struct btrfs_inode_item, size, 64);
1748 BTRFS_SETGET_STACK_FUNCS(stack_inode_nbytes, struct btrfs_inode_item,
1749                          nbytes, 64);
1750 BTRFS_SETGET_STACK_FUNCS(stack_inode_block_group, struct btrfs_inode_item,
1751                          block_group, 64);
1752 BTRFS_SETGET_STACK_FUNCS(stack_inode_nlink, struct btrfs_inode_item, nlink, 32);
1753 BTRFS_SETGET_STACK_FUNCS(stack_inode_uid, struct btrfs_inode_item, uid, 32);
1754 BTRFS_SETGET_STACK_FUNCS(stack_inode_gid, struct btrfs_inode_item, gid, 32);
1755 BTRFS_SETGET_STACK_FUNCS(stack_inode_mode, struct btrfs_inode_item, mode, 32);
1756 BTRFS_SETGET_STACK_FUNCS(stack_inode_rdev, struct btrfs_inode_item, rdev, 64);
1757 BTRFS_SETGET_STACK_FUNCS(stack_inode_flags, struct btrfs_inode_item, flags, 64);
1758 BTRFS_SETGET_FUNCS(timespec_sec, struct btrfs_timespec, sec, 64);
1759 BTRFS_SETGET_FUNCS(timespec_nsec, struct btrfs_timespec, nsec, 32);
1760 BTRFS_SETGET_STACK_FUNCS(stack_timespec_sec, struct btrfs_timespec, sec, 64);
1761 BTRFS_SETGET_STACK_FUNCS(stack_timespec_nsec, struct btrfs_timespec, nsec, 32);
1762
1763 /* struct btrfs_dev_extent */
1764 BTRFS_SETGET_FUNCS(dev_extent_chunk_tree, struct btrfs_dev_extent,
1765                    chunk_tree, 64);
1766 BTRFS_SETGET_FUNCS(dev_extent_chunk_objectid, struct btrfs_dev_extent,
1767                    chunk_objectid, 64);
1768 BTRFS_SETGET_FUNCS(dev_extent_chunk_offset, struct btrfs_dev_extent,
1769                    chunk_offset, 64);
1770 BTRFS_SETGET_FUNCS(dev_extent_length, struct btrfs_dev_extent, length, 64);
1771
1772 static inline unsigned long btrfs_dev_extent_chunk_tree_uuid(struct btrfs_dev_extent *dev)
1773 {
1774         unsigned long ptr = offsetof(struct btrfs_dev_extent, chunk_tree_uuid);
1775         return (unsigned long)dev + ptr;
1776 }
1777
1778 BTRFS_SETGET_FUNCS(extent_refs, struct btrfs_extent_item, refs, 64);
1779 BTRFS_SETGET_FUNCS(extent_generation, struct btrfs_extent_item,
1780                    generation, 64);
1781 BTRFS_SETGET_FUNCS(extent_flags, struct btrfs_extent_item, flags, 64);
1782
1783 BTRFS_SETGET_FUNCS(extent_refs_v0, struct btrfs_extent_item_v0, refs, 32);
1784
1785
1786 BTRFS_SETGET_FUNCS(tree_block_level, struct btrfs_tree_block_info, level, 8);
1787
1788 static inline void btrfs_tree_block_key(struct extent_buffer *eb,
1789                                         struct btrfs_tree_block_info *item,
1790                                         struct btrfs_disk_key *key)
1791 {
1792         read_eb_member(eb, item, struct btrfs_tree_block_info, key, key);
1793 }
1794
1795 static inline void btrfs_set_tree_block_key(struct extent_buffer *eb,
1796                                             struct btrfs_tree_block_info *item,
1797                                             struct btrfs_disk_key *key)
1798 {
1799         write_eb_member(eb, item, struct btrfs_tree_block_info, key, key);
1800 }
1801
1802 BTRFS_SETGET_FUNCS(extent_data_ref_root, struct btrfs_extent_data_ref,
1803                    root, 64);
1804 BTRFS_SETGET_FUNCS(extent_data_ref_objectid, struct btrfs_extent_data_ref,
1805                    objectid, 64);
1806 BTRFS_SETGET_FUNCS(extent_data_ref_offset, struct btrfs_extent_data_ref,
1807                    offset, 64);
1808 BTRFS_SETGET_FUNCS(extent_data_ref_count, struct btrfs_extent_data_ref,
1809                    count, 32);
1810
1811 BTRFS_SETGET_FUNCS(shared_data_ref_count, struct btrfs_shared_data_ref,
1812                    count, 32);
1813
1814 BTRFS_SETGET_FUNCS(extent_inline_ref_type, struct btrfs_extent_inline_ref,
1815                    type, 8);
1816 BTRFS_SETGET_FUNCS(extent_inline_ref_offset, struct btrfs_extent_inline_ref,
1817                    offset, 64);
1818
1819 static inline u32 btrfs_extent_inline_ref_size(int type)
1820 {
1821         if (type == BTRFS_TREE_BLOCK_REF_KEY ||
1822             type == BTRFS_SHARED_BLOCK_REF_KEY)
1823                 return sizeof(struct btrfs_extent_inline_ref);
1824         if (type == BTRFS_SHARED_DATA_REF_KEY)
1825                 return sizeof(struct btrfs_shared_data_ref) +
1826                        sizeof(struct btrfs_extent_inline_ref);
1827         if (type == BTRFS_EXTENT_DATA_REF_KEY)
1828                 return sizeof(struct btrfs_extent_data_ref) +
1829                        offsetof(struct btrfs_extent_inline_ref, offset);
1830         return 0;
1831 }
1832
1833 BTRFS_SETGET_FUNCS(ref_root_v0, struct btrfs_extent_ref_v0, root, 64);
1834 BTRFS_SETGET_FUNCS(ref_generation_v0, struct btrfs_extent_ref_v0,
1835                    generation, 64);
1836 BTRFS_SETGET_FUNCS(ref_objectid_v0, struct btrfs_extent_ref_v0, objectid, 64);
1837 BTRFS_SETGET_FUNCS(ref_count_v0, struct btrfs_extent_ref_v0, count, 32);
1838
1839 /* struct btrfs_node */
1840 BTRFS_SETGET_FUNCS(key_blockptr, struct btrfs_key_ptr, blockptr, 64);
1841 BTRFS_SETGET_FUNCS(key_generation, struct btrfs_key_ptr, generation, 64);
1842 BTRFS_SETGET_STACK_FUNCS(stack_key_blockptr, struct btrfs_key_ptr,
1843                          blockptr, 64);
1844 BTRFS_SETGET_STACK_FUNCS(stack_key_generation, struct btrfs_key_ptr,
1845                          generation, 64);
1846
1847 static inline u64 btrfs_node_blockptr(struct extent_buffer *eb, int nr)
1848 {
1849         unsigned long ptr;
1850         ptr = offsetof(struct btrfs_node, ptrs) +
1851                 sizeof(struct btrfs_key_ptr) * nr;
1852         return btrfs_key_blockptr(eb, (struct btrfs_key_ptr *)ptr);
1853 }
1854
1855 static inline void btrfs_set_node_blockptr(struct extent_buffer *eb,
1856                                            int nr, u64 val)
1857 {
1858         unsigned long ptr;
1859         ptr = offsetof(struct btrfs_node, ptrs) +
1860                 sizeof(struct btrfs_key_ptr) * nr;
1861         btrfs_set_key_blockptr(eb, (struct btrfs_key_ptr *)ptr, val);
1862 }
1863
1864 static inline u64 btrfs_node_ptr_generation(struct extent_buffer *eb, int nr)
1865 {
1866         unsigned long ptr;
1867         ptr = offsetof(struct btrfs_node, ptrs) +
1868                 sizeof(struct btrfs_key_ptr) * nr;
1869         return btrfs_key_generation(eb, (struct btrfs_key_ptr *)ptr);
1870 }
1871
1872 static inline void btrfs_set_node_ptr_generation(struct extent_buffer *eb,
1873                                                  int nr, u64 val)
1874 {
1875         unsigned long ptr;
1876         ptr = offsetof(struct btrfs_node, ptrs) +
1877                 sizeof(struct btrfs_key_ptr) * nr;
1878         btrfs_set_key_generation(eb, (struct btrfs_key_ptr *)ptr, val);
1879 }
1880
1881 static inline unsigned long btrfs_node_key_ptr_offset(int nr)
1882 {
1883         return offsetof(struct btrfs_node, ptrs) +
1884                 sizeof(struct btrfs_key_ptr) * nr;
1885 }
1886
1887 void btrfs_node_key(const struct extent_buffer *eb,
1888                     struct btrfs_disk_key *disk_key, int nr);
1889
1890 static inline void btrfs_set_node_key(struct extent_buffer *eb,
1891                                       struct btrfs_disk_key *disk_key, int nr)
1892 {
1893         unsigned long ptr;
1894         ptr = btrfs_node_key_ptr_offset(nr);
1895         write_eb_member(eb, (struct btrfs_key_ptr *)ptr,
1896                        struct btrfs_key_ptr, key, disk_key);
1897 }
1898
1899 /* struct btrfs_item */
1900 BTRFS_SETGET_FUNCS(item_offset, struct btrfs_item, offset, 32);
1901 BTRFS_SETGET_FUNCS(item_size, struct btrfs_item, size, 32);
1902 BTRFS_SETGET_STACK_FUNCS(stack_item_offset, struct btrfs_item, offset, 32);
1903 BTRFS_SETGET_STACK_FUNCS(stack_item_size, struct btrfs_item, size, 32);
1904
1905 static inline unsigned long btrfs_item_nr_offset(int nr)
1906 {
1907         return offsetof(struct btrfs_leaf, items) +
1908                 sizeof(struct btrfs_item) * nr;
1909 }
1910
1911 static inline struct btrfs_item *btrfs_item_nr(int nr)
1912 {
1913         return (struct btrfs_item *)btrfs_item_nr_offset(nr);
1914 }
1915
1916 static inline u32 btrfs_item_end(const struct extent_buffer *eb,
1917                                  struct btrfs_item *item)
1918 {
1919         return btrfs_item_offset(eb, item) + btrfs_item_size(eb, item);
1920 }
1921
1922 static inline u32 btrfs_item_end_nr(const struct extent_buffer *eb, int nr)
1923 {
1924         return btrfs_item_end(eb, btrfs_item_nr(nr));
1925 }
1926
1927 static inline u32 btrfs_item_offset_nr(const struct extent_buffer *eb, int nr)
1928 {
1929         return btrfs_item_offset(eb, btrfs_item_nr(nr));
1930 }
1931
1932 static inline u32 btrfs_item_size_nr(const struct extent_buffer *eb, int nr)
1933 {
1934         return btrfs_item_size(eb, btrfs_item_nr(nr));
1935 }
1936
1937 static inline void btrfs_item_key(const struct extent_buffer *eb,
1938                            struct btrfs_disk_key *disk_key, int nr)
1939 {
1940         struct btrfs_item *item = btrfs_item_nr(nr);
1941         read_eb_member(eb, item, struct btrfs_item, key, disk_key);
1942 }
1943
1944 static inline void btrfs_set_item_key(struct extent_buffer *eb,
1945                                struct btrfs_disk_key *disk_key, int nr)
1946 {
1947         struct btrfs_item *item = btrfs_item_nr(nr);
1948         write_eb_member(eb, item, struct btrfs_item, key, disk_key);
1949 }
1950
1951 BTRFS_SETGET_FUNCS(dir_log_end, struct btrfs_dir_log_item, end, 64);
1952
1953 /*
1954  * struct btrfs_root_ref
1955  */
1956 BTRFS_SETGET_FUNCS(root_ref_dirid, struct btrfs_root_ref, dirid, 64);
1957 BTRFS_SETGET_FUNCS(root_ref_sequence, struct btrfs_root_ref, sequence, 64);
1958 BTRFS_SETGET_FUNCS(root_ref_name_len, struct btrfs_root_ref, name_len, 16);
1959
1960 /* struct btrfs_dir_item */
1961 BTRFS_SETGET_FUNCS(dir_data_len, struct btrfs_dir_item, data_len, 16);
1962 BTRFS_SETGET_FUNCS(dir_type, struct btrfs_dir_item, type, 8);
1963 BTRFS_SETGET_FUNCS(dir_name_len, struct btrfs_dir_item, name_len, 16);
1964 BTRFS_SETGET_FUNCS(dir_transid, struct btrfs_dir_item, transid, 64);
1965 BTRFS_SETGET_STACK_FUNCS(stack_dir_type, struct btrfs_dir_item, type, 8);
1966 BTRFS_SETGET_STACK_FUNCS(stack_dir_data_len, struct btrfs_dir_item,
1967                          data_len, 16);
1968 BTRFS_SETGET_STACK_FUNCS(stack_dir_name_len, struct btrfs_dir_item,
1969                          name_len, 16);
1970 BTRFS_SETGET_STACK_FUNCS(stack_dir_transid, struct btrfs_dir_item,
1971                          transid, 64);
1972
1973 static inline void btrfs_dir_item_key(const struct extent_buffer *eb,
1974                                       const struct btrfs_dir_item *item,
1975                                       struct btrfs_disk_key *key)
1976 {
1977         read_eb_member(eb, item, struct btrfs_dir_item, location, key);
1978 }
1979
1980 static inline void btrfs_set_dir_item_key(struct extent_buffer *eb,
1981                                           struct btrfs_dir_item *item,
1982                                           const struct btrfs_disk_key *key)
1983 {
1984         write_eb_member(eb, item, struct btrfs_dir_item, location, key);
1985 }
1986
1987 BTRFS_SETGET_FUNCS(free_space_entries, struct btrfs_free_space_header,
1988                    num_entries, 64);
1989 BTRFS_SETGET_FUNCS(free_space_bitmaps, struct btrfs_free_space_header,
1990                    num_bitmaps, 64);
1991 BTRFS_SETGET_FUNCS(free_space_generation, struct btrfs_free_space_header,
1992                    generation, 64);
1993
1994 static inline void btrfs_free_space_key(const struct extent_buffer *eb,
1995                                         const struct btrfs_free_space_header *h,
1996                                         struct btrfs_disk_key *key)
1997 {
1998         read_eb_member(eb, h, struct btrfs_free_space_header, location, key);
1999 }
2000
2001 static inline void btrfs_set_free_space_key(struct extent_buffer *eb,
2002                                             struct btrfs_free_space_header *h,
2003                                             const struct btrfs_disk_key *key)
2004 {
2005         write_eb_member(eb, h, struct btrfs_free_space_header, location, key);
2006 }
2007
2008 /* struct btrfs_disk_key */
2009 BTRFS_SETGET_STACK_FUNCS(disk_key_objectid, struct btrfs_disk_key,
2010                          objectid, 64);
2011 BTRFS_SETGET_STACK_FUNCS(disk_key_offset, struct btrfs_disk_key, offset, 64);
2012 BTRFS_SETGET_STACK_FUNCS(disk_key_type, struct btrfs_disk_key, type, 8);
2013
2014 static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu,
2015                                          const struct btrfs_disk_key *disk)
2016 {
2017         cpu->offset = le64_to_cpu(disk->offset);
2018         cpu->type = disk->type;
2019         cpu->objectid = le64_to_cpu(disk->objectid);
2020 }
2021
2022 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk,
2023                                          const struct btrfs_key *cpu)
2024 {
2025         disk->offset = cpu_to_le64(cpu->offset);
2026         disk->type = cpu->type;
2027         disk->objectid = cpu_to_le64(cpu->objectid);
2028 }
2029
2030 static inline void btrfs_node_key_to_cpu(const struct extent_buffer *eb,
2031                                          struct btrfs_key *key, int nr)
2032 {
2033         struct btrfs_disk_key disk_key;
2034         btrfs_node_key(eb, &disk_key, nr);
2035         btrfs_disk_key_to_cpu(key, &disk_key);
2036 }
2037
2038 static inline void btrfs_item_key_to_cpu(const struct extent_buffer *eb,
2039                                          struct btrfs_key *key, int nr)
2040 {
2041         struct btrfs_disk_key disk_key;
2042         btrfs_item_key(eb, &disk_key, nr);
2043         btrfs_disk_key_to_cpu(key, &disk_key);
2044 }
2045
2046 static inline void btrfs_dir_item_key_to_cpu(const struct extent_buffer *eb,
2047                                              const struct btrfs_dir_item *item,
2048                                              struct btrfs_key *key)
2049 {
2050         struct btrfs_disk_key disk_key;
2051         btrfs_dir_item_key(eb, item, &disk_key);
2052         btrfs_disk_key_to_cpu(key, &disk_key);
2053 }
2054
2055 static inline u8 btrfs_key_type(const struct btrfs_key *key)
2056 {
2057         return key->type;
2058 }
2059
2060 static inline void btrfs_set_key_type(struct btrfs_key *key, u8 val)
2061 {
2062         key->type = val;
2063 }
2064
2065 /* struct btrfs_header */
2066 BTRFS_SETGET_HEADER_FUNCS(header_bytenr, struct btrfs_header, bytenr, 64);
2067 BTRFS_SETGET_HEADER_FUNCS(header_generation, struct btrfs_header,
2068                           generation, 64);
2069 BTRFS_SETGET_HEADER_FUNCS(header_owner, struct btrfs_header, owner, 64);
2070 BTRFS_SETGET_HEADER_FUNCS(header_nritems, struct btrfs_header, nritems, 32);
2071 BTRFS_SETGET_HEADER_FUNCS(header_flags, struct btrfs_header, flags, 64);
2072 BTRFS_SETGET_HEADER_FUNCS(header_level, struct btrfs_header, level, 8);
2073 BTRFS_SETGET_STACK_FUNCS(stack_header_generation, struct btrfs_header,
2074                          generation, 64);
2075 BTRFS_SETGET_STACK_FUNCS(stack_header_owner, struct btrfs_header, owner, 64);
2076 BTRFS_SETGET_STACK_FUNCS(stack_header_nritems, struct btrfs_header,
2077                          nritems, 32);
2078 BTRFS_SETGET_STACK_FUNCS(stack_header_bytenr, struct btrfs_header, bytenr, 64);
2079
2080 static inline int btrfs_header_flag(const struct extent_buffer *eb, u64 flag)
2081 {
2082         return (btrfs_header_flags(eb) & flag) == flag;
2083 }
2084
2085 static inline int btrfs_set_header_flag(struct extent_buffer *eb, u64 flag)
2086 {
2087         u64 flags = btrfs_header_flags(eb);
2088         btrfs_set_header_flags(eb, flags | flag);
2089         return (flags & flag) == flag;
2090 }
2091
2092 static inline int btrfs_clear_header_flag(struct extent_buffer *eb, u64 flag)
2093 {
2094         u64 flags = btrfs_header_flags(eb);
2095         btrfs_set_header_flags(eb, flags & ~flag);
2096         return (flags & flag) == flag;
2097 }
2098
2099 static inline int btrfs_header_backref_rev(const struct extent_buffer *eb)
2100 {
2101         u64 flags = btrfs_header_flags(eb);
2102         return flags >> BTRFS_BACKREF_REV_SHIFT;
2103 }
2104
2105 static inline void btrfs_set_header_backref_rev(struct extent_buffer *eb,
2106                                                 int rev)
2107 {
2108         u64 flags = btrfs_header_flags(eb);
2109         flags &= ~BTRFS_BACKREF_REV_MASK;
2110         flags |= (u64)rev << BTRFS_BACKREF_REV_SHIFT;
2111         btrfs_set_header_flags(eb, flags);
2112 }
2113
2114 static inline unsigned long btrfs_header_fsid(void)
2115 {
2116         return offsetof(struct btrfs_header, fsid);
2117 }
2118
2119 static inline unsigned long btrfs_header_chunk_tree_uuid(const struct extent_buffer *eb)
2120 {
2121         return offsetof(struct btrfs_header, chunk_tree_uuid);
2122 }
2123
2124 static inline int btrfs_is_leaf(const struct extent_buffer *eb)
2125 {
2126         return btrfs_header_level(eb) == 0;
2127 }
2128
2129 /* struct btrfs_root_item */
2130 BTRFS_SETGET_FUNCS(disk_root_generation, struct btrfs_root_item,
2131                    generation, 64);
2132 BTRFS_SETGET_FUNCS(disk_root_refs, struct btrfs_root_item, refs, 32);
2133 BTRFS_SETGET_FUNCS(disk_root_bytenr, struct btrfs_root_item, bytenr, 64);
2134 BTRFS_SETGET_FUNCS(disk_root_level, struct btrfs_root_item, level, 8);
2135
2136 BTRFS_SETGET_STACK_FUNCS(root_generation, struct btrfs_root_item,
2137                          generation, 64);
2138 BTRFS_SETGET_STACK_FUNCS(root_bytenr, struct btrfs_root_item, bytenr, 64);
2139 BTRFS_SETGET_STACK_FUNCS(root_level, struct btrfs_root_item, level, 8);
2140 BTRFS_SETGET_STACK_FUNCS(root_dirid, struct btrfs_root_item, root_dirid, 64);
2141 BTRFS_SETGET_STACK_FUNCS(root_refs, struct btrfs_root_item, refs, 32);
2142 BTRFS_SETGET_STACK_FUNCS(root_flags, struct btrfs_root_item, flags, 64);
2143 BTRFS_SETGET_STACK_FUNCS(root_used, struct btrfs_root_item, bytes_used, 64);
2144 BTRFS_SETGET_STACK_FUNCS(root_limit, struct btrfs_root_item, byte_limit, 64);
2145 BTRFS_SETGET_STACK_FUNCS(root_last_snapshot, struct btrfs_root_item,
2146                          last_snapshot, 64);
2147 BTRFS_SETGET_STACK_FUNCS(root_generation_v2, struct btrfs_root_item,
2148                          generation_v2, 64);
2149 BTRFS_SETGET_STACK_FUNCS(root_ctransid, struct btrfs_root_item,
2150                          ctransid, 64);
2151 BTRFS_SETGET_STACK_FUNCS(root_otransid, struct btrfs_root_item,
2152                          otransid, 64);
2153 BTRFS_SETGET_STACK_FUNCS(root_stransid, struct btrfs_root_item,
2154                          stransid, 64);
2155 BTRFS_SETGET_STACK_FUNCS(root_rtransid, struct btrfs_root_item,
2156                          rtransid, 64);
2157
2158 static inline bool btrfs_root_readonly(const struct btrfs_root *root)
2159 {
2160         return (root->root_item.flags & cpu_to_le64(BTRFS_ROOT_SUBVOL_RDONLY)) != 0;
2161 }
2162
2163 static inline bool btrfs_root_dead(const struct btrfs_root *root)
2164 {
2165         return (root->root_item.flags & cpu_to_le64(BTRFS_ROOT_SUBVOL_DEAD)) != 0;
2166 }
2167
2168 /* struct btrfs_root_backup */
2169 BTRFS_SETGET_STACK_FUNCS(backup_tree_root, struct btrfs_root_backup,
2170                    tree_root, 64);
2171 BTRFS_SETGET_STACK_FUNCS(backup_tree_root_gen, struct btrfs_root_backup,
2172                    tree_root_gen, 64);
2173 BTRFS_SETGET_STACK_FUNCS(backup_tree_root_level, struct btrfs_root_backup,
2174                    tree_root_level, 8);
2175
2176 BTRFS_SETGET_STACK_FUNCS(backup_chunk_root, struct btrfs_root_backup,
2177                    chunk_root, 64);
2178 BTRFS_SETGET_STACK_FUNCS(backup_chunk_root_gen, struct btrfs_root_backup,
2179                    chunk_root_gen, 64);
2180 BTRFS_SETGET_STACK_FUNCS(backup_chunk_root_level, struct btrfs_root_backup,
2181                    chunk_root_level, 8);
2182
2183 BTRFS_SETGET_STACK_FUNCS(backup_extent_root, struct btrfs_root_backup,
2184                    extent_root, 64);
2185 BTRFS_SETGET_STACK_FUNCS(backup_extent_root_gen, struct btrfs_root_backup,
2186                    extent_root_gen, 64);
2187 BTRFS_SETGET_STACK_FUNCS(backup_extent_root_level, struct btrfs_root_backup,
2188                    extent_root_level, 8);
2189
2190 BTRFS_SETGET_STACK_FUNCS(backup_fs_root, struct btrfs_root_backup,
2191                    fs_root, 64);
2192 BTRFS_SETGET_STACK_FUNCS(backup_fs_root_gen, struct btrfs_root_backup,
2193                    fs_root_gen, 64);
2194 BTRFS_SETGET_STACK_FUNCS(backup_fs_root_level, struct btrfs_root_backup,
2195                    fs_root_level, 8);
2196
2197 BTRFS_SETGET_STACK_FUNCS(backup_dev_root, struct btrfs_root_backup,
2198                    dev_root, 64);
2199 BTRFS_SETGET_STACK_FUNCS(backup_dev_root_gen, struct btrfs_root_backup,
2200                    dev_root_gen, 64);
2201 BTRFS_SETGET_STACK_FUNCS(backup_dev_root_level, struct btrfs_root_backup,
2202                    dev_root_level, 8);
2203
2204 BTRFS_SETGET_STACK_FUNCS(backup_csum_root, struct btrfs_root_backup,
2205                    csum_root, 64);
2206 BTRFS_SETGET_STACK_FUNCS(backup_csum_root_gen, struct btrfs_root_backup,
2207                    csum_root_gen, 64);
2208 BTRFS_SETGET_STACK_FUNCS(backup_csum_root_level, struct btrfs_root_backup,
2209                    csum_root_level, 8);
2210 BTRFS_SETGET_STACK_FUNCS(backup_total_bytes, struct btrfs_root_backup,
2211                    total_bytes, 64);
2212 BTRFS_SETGET_STACK_FUNCS(backup_bytes_used, struct btrfs_root_backup,
2213                    bytes_used, 64);
2214 BTRFS_SETGET_STACK_FUNCS(backup_num_devices, struct btrfs_root_backup,
2215                    num_devices, 64);
2216
2217 /* struct btrfs_balance_item */
2218 BTRFS_SETGET_FUNCS(balance_flags, struct btrfs_balance_item, flags, 64);
2219
2220 static inline void btrfs_balance_data(const struct extent_buffer *eb,
2221                                       const struct btrfs_balance_item *bi,
2222                                       struct btrfs_disk_balance_args *ba)
2223 {
2224         read_eb_member(eb, bi, struct btrfs_balance_item, data, ba);
2225 }
2226
2227 static inline void btrfs_set_balance_data(struct extent_buffer *eb,
2228                                   struct btrfs_balance_item *bi,
2229                                   const struct btrfs_disk_balance_args *ba)
2230 {
2231         write_eb_member(eb, bi, struct btrfs_balance_item, data, ba);
2232 }
2233
2234 static inline void btrfs_balance_meta(const struct extent_buffer *eb,
2235                                       const struct btrfs_balance_item *bi,
2236                                       struct btrfs_disk_balance_args *ba)
2237 {
2238         read_eb_member(eb, bi, struct btrfs_balance_item, meta, ba);
2239 }
2240
2241 static inline void btrfs_set_balance_meta(struct extent_buffer *eb,
2242                                   struct btrfs_balance_item *bi,
2243                                   const struct btrfs_disk_balance_args *ba)
2244 {
2245         write_eb_member(eb, bi, struct btrfs_balance_item, meta, ba);
2246 }
2247
2248 static inline void btrfs_balance_sys(const struct extent_buffer *eb,
2249                                      const struct btrfs_balance_item *bi,
2250                                      struct btrfs_disk_balance_args *ba)
2251 {
2252         read_eb_member(eb, bi, struct btrfs_balance_item, sys, ba);
2253 }
2254
2255 static inline void btrfs_set_balance_sys(struct extent_buffer *eb,
2256                                  struct btrfs_balance_item *bi,
2257                                  const struct btrfs_disk_balance_args *ba)
2258 {
2259         write_eb_member(eb, bi, struct btrfs_balance_item, sys, ba);
2260 }
2261
2262 static inline void
2263 btrfs_disk_balance_args_to_cpu(struct btrfs_balance_args *cpu,
2264                                const struct btrfs_disk_balance_args *disk)
2265 {
2266         memset(cpu, 0, sizeof(*cpu));
2267
2268         cpu->profiles = le64_to_cpu(disk->profiles);
2269         cpu->usage = le64_to_cpu(disk->usage);
2270         cpu->devid = le64_to_cpu(disk->devid);
2271         cpu->pstart = le64_to_cpu(disk->pstart);
2272         cpu->pend = le64_to_cpu(disk->pend);
2273         cpu->vstart = le64_to_cpu(disk->vstart);
2274         cpu->vend = le64_to_cpu(disk->vend);
2275         cpu->target = le64_to_cpu(disk->target);
2276         cpu->flags = le64_to_cpu(disk->flags);
2277         cpu->limit = le64_to_cpu(disk->limit);
2278         cpu->stripes_min = le32_to_cpu(disk->stripes_min);
2279         cpu->stripes_max = le32_to_cpu(disk->stripes_max);
2280 }
2281
2282 static inline void
2283 btrfs_cpu_balance_args_to_disk(struct btrfs_disk_balance_args *disk,
2284                                const struct btrfs_balance_args *cpu)
2285 {
2286         memset(disk, 0, sizeof(*disk));
2287
2288         disk->profiles = cpu_to_le64(cpu->profiles);
2289         disk->usage = cpu_to_le64(cpu->usage);
2290         disk->devid = cpu_to_le64(cpu->devid);
2291         disk->pstart = cpu_to_le64(cpu->pstart);
2292         disk->pend = cpu_to_le64(cpu->pend);
2293         disk->vstart = cpu_to_le64(cpu->vstart);
2294         disk->vend = cpu_to_le64(cpu->vend);
2295         disk->target = cpu_to_le64(cpu->target);
2296         disk->flags = cpu_to_le64(cpu->flags);
2297         disk->limit = cpu_to_le64(cpu->limit);
2298         disk->stripes_min = cpu_to_le32(cpu->stripes_min);
2299         disk->stripes_max = cpu_to_le32(cpu->stripes_max);
2300 }
2301
2302 /* struct btrfs_super_block */
2303 BTRFS_SETGET_STACK_FUNCS(super_bytenr, struct btrfs_super_block, bytenr, 64);
2304 BTRFS_SETGET_STACK_FUNCS(super_flags, struct btrfs_super_block, flags, 64);
2305 BTRFS_SETGET_STACK_FUNCS(super_generation, struct btrfs_super_block,
2306                          generation, 64);
2307 BTRFS_SETGET_STACK_FUNCS(super_root, struct btrfs_super_block, root, 64);
2308 BTRFS_SETGET_STACK_FUNCS(super_sys_array_size,
2309                          struct btrfs_super_block, sys_chunk_array_size, 32);
2310 BTRFS_SETGET_STACK_FUNCS(super_chunk_root_generation,
2311                          struct btrfs_super_block, chunk_root_generation, 64);
2312 BTRFS_SETGET_STACK_FUNCS(super_root_level, struct btrfs_super_block,
2313                          root_level, 8);
2314 BTRFS_SETGET_STACK_FUNCS(super_chunk_root, struct btrfs_super_block,
2315                          chunk_root, 64);
2316 BTRFS_SETGET_STACK_FUNCS(super_chunk_root_level, struct btrfs_super_block,
2317                          chunk_root_level, 8);
2318 BTRFS_SETGET_STACK_FUNCS(super_log_root, struct btrfs_super_block,
2319                          log_root, 64);
2320 BTRFS_SETGET_STACK_FUNCS(super_log_root_transid, struct btrfs_super_block,
2321                          log_root_transid, 64);
2322 BTRFS_SETGET_STACK_FUNCS(super_log_root_level, struct btrfs_super_block,
2323                          log_root_level, 8);
2324 BTRFS_SETGET_STACK_FUNCS(super_total_bytes, struct btrfs_super_block,
2325                          total_bytes, 64);
2326 BTRFS_SETGET_STACK_FUNCS(super_bytes_used, struct btrfs_super_block,
2327                          bytes_used, 64);
2328 BTRFS_SETGET_STACK_FUNCS(super_sectorsize, struct btrfs_super_block,
2329                          sectorsize, 32);
2330 BTRFS_SETGET_STACK_FUNCS(super_nodesize, struct btrfs_super_block,
2331                          nodesize, 32);
2332 BTRFS_SETGET_STACK_FUNCS(super_stripesize, struct btrfs_super_block,
2333                          stripesize, 32);
2334 BTRFS_SETGET_STACK_FUNCS(super_root_dir, struct btrfs_super_block,
2335                          root_dir_objectid, 64);
2336 BTRFS_SETGET_STACK_FUNCS(super_num_devices, struct btrfs_super_block,
2337                          num_devices, 64);
2338 BTRFS_SETGET_STACK_FUNCS(super_compat_flags, struct btrfs_super_block,
2339                          compat_flags, 64);
2340 BTRFS_SETGET_STACK_FUNCS(super_compat_ro_flags, struct btrfs_super_block,
2341                          compat_ro_flags, 64);
2342 BTRFS_SETGET_STACK_FUNCS(super_incompat_flags, struct btrfs_super_block,
2343                          incompat_flags, 64);
2344 BTRFS_SETGET_STACK_FUNCS(super_csum_type, struct btrfs_super_block,
2345                          csum_type, 16);
2346 BTRFS_SETGET_STACK_FUNCS(super_cache_generation, struct btrfs_super_block,
2347                          cache_generation, 64);
2348 BTRFS_SETGET_STACK_FUNCS(super_magic, struct btrfs_super_block, magic, 64);
2349 BTRFS_SETGET_STACK_FUNCS(super_uuid_tree_generation, struct btrfs_super_block,
2350                          uuid_tree_generation, 64);
2351
2352 static inline int btrfs_super_csum_size(const struct btrfs_super_block *s)
2353 {
2354         u16 t = btrfs_super_csum_type(s);
2355         /*
2356          * csum type is validated at mount time
2357          */
2358         return btrfs_csum_sizes[t];
2359 }
2360
2361
2362 /*
2363  * The leaf data grows from end-to-front in the node.
2364  * this returns the address of the start of the last item,
2365  * which is the stop of the leaf data stack
2366  */
2367 static inline unsigned int leaf_data_end(const struct btrfs_fs_info *fs_info,
2368                                          const struct extent_buffer *leaf)
2369 {
2370         u32 nr = btrfs_header_nritems(leaf);
2371
2372         if (nr == 0)
2373                 return BTRFS_LEAF_DATA_SIZE(fs_info);
2374         return btrfs_item_offset_nr(leaf, nr - 1);
2375 }
2376
2377 /* struct btrfs_file_extent_item */
2378 BTRFS_SETGET_FUNCS(file_extent_type, struct btrfs_file_extent_item, type, 8);
2379 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_disk_bytenr,
2380                          struct btrfs_file_extent_item, disk_bytenr, 64);
2381 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_offset,
2382                          struct btrfs_file_extent_item, offset, 64);
2383 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_generation,
2384                          struct btrfs_file_extent_item, generation, 64);
2385 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_num_bytes,
2386                          struct btrfs_file_extent_item, num_bytes, 64);
2387 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_disk_num_bytes,
2388                          struct btrfs_file_extent_item, disk_num_bytes, 64);
2389 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_compression,
2390                          struct btrfs_file_extent_item, compression, 8);
2391
2392 static inline unsigned long
2393 btrfs_file_extent_inline_start(const struct btrfs_file_extent_item *e)
2394 {
2395         return (unsigned long)e + BTRFS_FILE_EXTENT_INLINE_DATA_START;
2396 }
2397
2398 static inline u32 btrfs_file_extent_calc_inline_size(u32 datasize)
2399 {
2400         return BTRFS_FILE_EXTENT_INLINE_DATA_START + datasize;
2401 }
2402
2403 BTRFS_SETGET_FUNCS(file_extent_disk_bytenr, struct btrfs_file_extent_item,
2404                    disk_bytenr, 64);
2405 BTRFS_SETGET_FUNCS(file_extent_generation, struct btrfs_file_extent_item,
2406                    generation, 64);
2407 BTRFS_SETGET_FUNCS(file_extent_disk_num_bytes, struct btrfs_file_extent_item,
2408                    disk_num_bytes, 64);
2409 BTRFS_SETGET_FUNCS(file_extent_offset, struct btrfs_file_extent_item,
2410                   offset, 64);
2411 BTRFS_SETGET_FUNCS(file_extent_num_bytes, struct btrfs_file_extent_item,
2412                    num_bytes, 64);
2413 BTRFS_SETGET_FUNCS(file_extent_ram_bytes, struct btrfs_file_extent_item,
2414                    ram_bytes, 64);
2415 BTRFS_SETGET_FUNCS(file_extent_compression, struct btrfs_file_extent_item,
2416                    compression, 8);
2417 BTRFS_SETGET_FUNCS(file_extent_encryption, struct btrfs_file_extent_item,
2418                    encryption, 8);
2419 BTRFS_SETGET_FUNCS(file_extent_other_encoding, struct btrfs_file_extent_item,
2420                    other_encoding, 16);
2421
2422 /*
2423  * this returns the number of bytes used by the item on disk, minus the
2424  * size of any extent headers.  If a file is compressed on disk, this is
2425  * the compressed size
2426  */
2427 static inline u32 btrfs_file_extent_inline_item_len(
2428                                                 const struct extent_buffer *eb,
2429                                                 struct btrfs_item *e)
2430 {
2431         return btrfs_item_size(eb, e) - BTRFS_FILE_EXTENT_INLINE_DATA_START;
2432 }
2433
2434 /* btrfs_dev_stats_item */
2435 static inline u64 btrfs_dev_stats_value(const struct extent_buffer *eb,
2436                                         const struct btrfs_dev_stats_item *ptr,
2437                                         int index)
2438 {
2439         u64 val;
2440
2441         read_extent_buffer(eb, &val,
2442                            offsetof(struct btrfs_dev_stats_item, values) +
2443                             ((unsigned long)ptr) + (index * sizeof(u64)),
2444                            sizeof(val));
2445         return val;
2446 }
2447
2448 static inline void btrfs_set_dev_stats_value(struct extent_buffer *eb,
2449                                              struct btrfs_dev_stats_item *ptr,
2450                                              int index, u64 val)
2451 {
2452         write_extent_buffer(eb, &val,
2453                             offsetof(struct btrfs_dev_stats_item, values) +
2454                              ((unsigned long)ptr) + (index * sizeof(u64)),
2455                             sizeof(val));
2456 }
2457
2458 /* btrfs_qgroup_status_item */
2459 BTRFS_SETGET_FUNCS(qgroup_status_generation, struct btrfs_qgroup_status_item,
2460                    generation, 64);
2461 BTRFS_SETGET_FUNCS(qgroup_status_version, struct btrfs_qgroup_status_item,
2462                    version, 64);
2463 BTRFS_SETGET_FUNCS(qgroup_status_flags, struct btrfs_qgroup_status_item,
2464                    flags, 64);
2465 BTRFS_SETGET_FUNCS(qgroup_status_rescan, struct btrfs_qgroup_status_item,
2466                    rescan, 64);
2467
2468 /* btrfs_qgroup_info_item */
2469 BTRFS_SETGET_FUNCS(qgroup_info_generation, struct btrfs_qgroup_info_item,
2470                    generation, 64);
2471 BTRFS_SETGET_FUNCS(qgroup_info_rfer, struct btrfs_qgroup_info_item, rfer, 64);
2472 BTRFS_SETGET_FUNCS(qgroup_info_rfer_cmpr, struct btrfs_qgroup_info_item,
2473                    rfer_cmpr, 64);
2474 BTRFS_SETGET_FUNCS(qgroup_info_excl, struct btrfs_qgroup_info_item, excl, 64);
2475 BTRFS_SETGET_FUNCS(qgroup_info_excl_cmpr, struct btrfs_qgroup_info_item,
2476                    excl_cmpr, 64);
2477
2478 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_generation,
2479                          struct btrfs_qgroup_info_item, generation, 64);
2480 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_rfer, struct btrfs_qgroup_info_item,
2481                          rfer, 64);
2482 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_rfer_cmpr,
2483                          struct btrfs_qgroup_info_item, rfer_cmpr, 64);
2484 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_excl, struct btrfs_qgroup_info_item,
2485                          excl, 64);
2486 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_excl_cmpr,
2487                          struct btrfs_qgroup_info_item, excl_cmpr, 64);
2488
2489 /* btrfs_qgroup_limit_item */
2490 BTRFS_SETGET_FUNCS(qgroup_limit_flags, struct btrfs_qgroup_limit_item,
2491                    flags, 64);
2492 BTRFS_SETGET_FUNCS(qgroup_limit_max_rfer, struct btrfs_qgroup_limit_item,
2493                    max_rfer, 64);
2494 BTRFS_SETGET_FUNCS(qgroup_limit_max_excl, struct btrfs_qgroup_limit_item,
2495                    max_excl, 64);
2496 BTRFS_SETGET_FUNCS(qgroup_limit_rsv_rfer, struct btrfs_qgroup_limit_item,
2497                    rsv_rfer, 64);
2498 BTRFS_SETGET_FUNCS(qgroup_limit_rsv_excl, struct btrfs_qgroup_limit_item,
2499                    rsv_excl, 64);
2500
2501 /* btrfs_dev_replace_item */
2502 BTRFS_SETGET_FUNCS(dev_replace_src_devid,
2503                    struct btrfs_dev_replace_item, src_devid, 64);
2504 BTRFS_SETGET_FUNCS(dev_replace_cont_reading_from_srcdev_mode,
2505                    struct btrfs_dev_replace_item, cont_reading_from_srcdev_mode,
2506                    64);
2507 BTRFS_SETGET_FUNCS(dev_replace_replace_state, struct btrfs_dev_replace_item,
2508                    replace_state, 64);
2509 BTRFS_SETGET_FUNCS(dev_replace_time_started, struct btrfs_dev_replace_item,
2510                    time_started, 64);
2511 BTRFS_SETGET_FUNCS(dev_replace_time_stopped, struct btrfs_dev_replace_item,
2512                    time_stopped, 64);
2513 BTRFS_SETGET_FUNCS(dev_replace_num_write_errors, struct btrfs_dev_replace_item,
2514                    num_write_errors, 64);
2515 BTRFS_SETGET_FUNCS(dev_replace_num_uncorrectable_read_errors,
2516                    struct btrfs_dev_replace_item, num_uncorrectable_read_errors,
2517                    64);
2518 BTRFS_SETGET_FUNCS(dev_replace_cursor_left, struct btrfs_dev_replace_item,
2519                    cursor_left, 64);
2520 BTRFS_SETGET_FUNCS(dev_replace_cursor_right, struct btrfs_dev_replace_item,
2521                    cursor_right, 64);
2522
2523 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_src_devid,
2524                          struct btrfs_dev_replace_item, src_devid, 64);
2525 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_cont_reading_from_srcdev_mode,
2526                          struct btrfs_dev_replace_item,
2527                          cont_reading_from_srcdev_mode, 64);
2528 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_replace_state,
2529                          struct btrfs_dev_replace_item, replace_state, 64);
2530 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_time_started,
2531                          struct btrfs_dev_replace_item, time_started, 64);
2532 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_time_stopped,
2533                          struct btrfs_dev_replace_item, time_stopped, 64);
2534 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_num_write_errors,
2535                          struct btrfs_dev_replace_item, num_write_errors, 64);
2536 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_num_uncorrectable_read_errors,
2537                          struct btrfs_dev_replace_item,
2538                          num_uncorrectable_read_errors, 64);
2539 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_cursor_left,
2540                          struct btrfs_dev_replace_item, cursor_left, 64);
2541 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_cursor_right,
2542                          struct btrfs_dev_replace_item, cursor_right, 64);
2543
2544 /* helper function to cast into the data area of the leaf. */
2545 #define btrfs_item_ptr(leaf, slot, type) \
2546         ((type *)(BTRFS_LEAF_DATA_OFFSET + \
2547         btrfs_item_offset_nr(leaf, slot)))
2548
2549 #define btrfs_item_ptr_offset(leaf, slot) \
2550         ((unsigned long)(BTRFS_LEAF_DATA_OFFSET + \
2551         btrfs_item_offset_nr(leaf, slot)))
2552
2553 static inline u64 btrfs_name_hash(const char *name, int len)
2554 {
2555        return crc32c((u32)~1, name, len);
2556 }
2557
2558 /*
2559  * Figure the key offset of an extended inode ref
2560  */
2561 static inline u64 btrfs_extref_hash(u64 parent_objectid, const char *name,
2562                                    int len)
2563 {
2564        return (u64) crc32c(parent_objectid, name, len);
2565 }
2566
2567 static inline bool btrfs_mixed_space_info(struct btrfs_space_info *space_info)
2568 {
2569         return ((space_info->flags & BTRFS_BLOCK_GROUP_METADATA) &&
2570                 (space_info->flags & BTRFS_BLOCK_GROUP_DATA));
2571 }
2572
2573 static inline gfp_t btrfs_alloc_write_mask(struct address_space *mapping)
2574 {
2575         return mapping_gfp_constraint(mapping, ~__GFP_FS);
2576 }
2577
2578 /* extent-tree.c */
2579
2580 enum btrfs_inline_ref_type {
2581         BTRFS_REF_TYPE_INVALID =         0,
2582         BTRFS_REF_TYPE_BLOCK =           1,
2583         BTRFS_REF_TYPE_DATA =            2,
2584         BTRFS_REF_TYPE_ANY =             3,
2585 };
2586
2587 int btrfs_get_extent_inline_ref_type(const struct extent_buffer *eb,
2588                                      struct btrfs_extent_inline_ref *iref,
2589                                      enum btrfs_inline_ref_type is_data);
2590
2591 u64 btrfs_csum_bytes_to_leaves(struct btrfs_fs_info *fs_info, u64 csum_bytes);
2592
2593 static inline u64 btrfs_calc_trans_metadata_size(struct btrfs_fs_info *fs_info,
2594                                                  unsigned num_items)
2595 {
2596         return (u64)fs_info->nodesize * BTRFS_MAX_LEVEL * 2 * num_items;
2597 }
2598
2599 /*
2600  * Doing a truncate won't result in new nodes or leaves, just what we need for
2601  * COW.
2602  */
2603 static inline u64 btrfs_calc_trunc_metadata_size(struct btrfs_fs_info *fs_info,
2604                                                  unsigned num_items)
2605 {
2606         return (u64)fs_info->nodesize * BTRFS_MAX_LEVEL * num_items;
2607 }
2608
2609 int btrfs_should_throttle_delayed_refs(struct btrfs_trans_handle *trans,
2610                                        struct btrfs_fs_info *fs_info);
2611 int btrfs_check_space_for_delayed_refs(struct btrfs_trans_handle *trans,
2612                                        struct btrfs_fs_info *fs_info);
2613 void btrfs_dec_block_group_reservations(struct btrfs_fs_info *fs_info,
2614                                          const u64 start);
2615 void btrfs_wait_block_group_reservations(struct btrfs_block_group_cache *bg);
2616 bool btrfs_inc_nocow_writers(struct btrfs_fs_info *fs_info, u64 bytenr);
2617 void btrfs_dec_nocow_writers(struct btrfs_fs_info *fs_info, u64 bytenr);
2618 void btrfs_wait_nocow_writers(struct btrfs_block_group_cache *bg);
2619 void btrfs_put_block_group(struct btrfs_block_group_cache *cache);
2620 int btrfs_run_delayed_refs(struct btrfs_trans_handle *trans,
2621                            unsigned long count);
2622 int btrfs_async_run_delayed_refs(struct btrfs_fs_info *fs_info,
2623                                  unsigned long count, u64 transid, int wait);
2624 int btrfs_lookup_data_extent(struct btrfs_fs_info *fs_info, u64 start, u64 len);
2625 int btrfs_lookup_extent_info(struct btrfs_trans_handle *trans,
2626                              struct btrfs_fs_info *fs_info, u64 bytenr,
2627                              u64 offset, int metadata, u64 *refs, u64 *flags);
2628 int btrfs_pin_extent(struct btrfs_fs_info *fs_info,
2629                      u64 bytenr, u64 num, int reserved);
2630 int btrfs_pin_extent_for_log_replay(struct btrfs_fs_info *fs_info,
2631                                     u64 bytenr, u64 num_bytes);
2632 int btrfs_exclude_logged_extents(struct btrfs_fs_info *fs_info,
2633                                  struct extent_buffer *eb);
2634 int btrfs_cross_ref_exist(struct btrfs_root *root,
2635                           u64 objectid, u64 offset, u64 bytenr);
2636 struct btrfs_block_group_cache *btrfs_lookup_block_group(
2637                                                  struct btrfs_fs_info *info,
2638                                                  u64 bytenr);
2639 void btrfs_get_block_group(struct btrfs_block_group_cache *cache);
2640 void btrfs_put_block_group(struct btrfs_block_group_cache *cache);
2641 struct extent_buffer *btrfs_alloc_tree_block(struct btrfs_trans_handle *trans,
2642                                              struct btrfs_root *root,
2643                                              u64 parent, u64 root_objectid,
2644                                              const struct btrfs_disk_key *key,
2645                                              int level, u64 hint,
2646                                              u64 empty_size);
2647 void btrfs_free_tree_block(struct btrfs_trans_handle *trans,
2648                            struct btrfs_root *root,
2649                            struct extent_buffer *buf,
2650                            u64 parent, int last_ref);
2651 int btrfs_alloc_reserved_file_extent(struct btrfs_trans_handle *trans,
2652                                      struct btrfs_root *root, u64 owner,
2653                                      u64 offset, u64 ram_bytes,
2654                                      struct btrfs_key *ins);
2655 int btrfs_alloc_logged_file_extent(struct btrfs_trans_handle *trans,
2656                                    u64 root_objectid, u64 owner, u64 offset,
2657                                    struct btrfs_key *ins);
2658 int btrfs_reserve_extent(struct btrfs_root *root, u64 ram_bytes, u64 num_bytes,
2659                          u64 min_alloc_size, u64 empty_size, u64 hint_byte,
2660                          struct btrfs_key *ins, int is_data, int delalloc);
2661 int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2662                   struct extent_buffer *buf, int full_backref);
2663 int btrfs_dec_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2664                   struct extent_buffer *buf, int full_backref);
2665 int btrfs_set_disk_extent_flags(struct btrfs_trans_handle *trans,
2666                                 struct btrfs_fs_info *fs_info,
2667                                 u64 bytenr, u64 num_bytes, u64 flags,
2668                                 int level, int is_data);
2669 int btrfs_free_extent(struct btrfs_trans_handle *trans,
2670                       struct btrfs_root *root,
2671                       u64 bytenr, u64 num_bytes, u64 parent, u64 root_objectid,
2672                       u64 owner, u64 offset);
2673
2674 int btrfs_free_reserved_extent(struct btrfs_fs_info *fs_info,
2675                                u64 start, u64 len, int delalloc);
2676 int btrfs_free_and_pin_reserved_extent(struct btrfs_fs_info *fs_info,
2677                                        u64 start, u64 len);
2678 void btrfs_prepare_extent_commit(struct btrfs_fs_info *fs_info);
2679 int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans);
2680 int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
2681                          struct btrfs_root *root,
2682                          u64 bytenr, u64 num_bytes, u64 parent,
2683                          u64 root_objectid, u64 owner, u64 offset);
2684
2685 int btrfs_start_dirty_block_groups(struct btrfs_trans_handle *trans);
2686 int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans,
2687                                    struct btrfs_fs_info *fs_info);
2688 int btrfs_setup_space_cache(struct btrfs_trans_handle *trans,
2689                             struct btrfs_fs_info *fs_info);
2690 int btrfs_extent_readonly(struct btrfs_fs_info *fs_info, u64 bytenr);
2691 int btrfs_free_block_groups(struct btrfs_fs_info *info);
2692 int btrfs_read_block_groups(struct btrfs_fs_info *info);
2693 int btrfs_can_relocate(struct btrfs_fs_info *fs_info, u64 bytenr);
2694 int btrfs_make_block_group(struct btrfs_trans_handle *trans,
2695                            u64 bytes_used, u64 type, u64 chunk_offset,
2696                            u64 size);
2697 void btrfs_add_raid_kobjects(struct btrfs_fs_info *fs_info);
2698 struct btrfs_trans_handle *btrfs_start_trans_remove_block_group(
2699                                 struct btrfs_fs_info *fs_info,
2700                                 const u64 chunk_offset);
2701 int btrfs_remove_block_group(struct btrfs_trans_handle *trans,
2702                              u64 group_start, struct extent_map *em);
2703 void btrfs_delete_unused_bgs(struct btrfs_fs_info *fs_info);
2704 void btrfs_get_block_group_trimming(struct btrfs_block_group_cache *cache);
2705 void btrfs_put_block_group_trimming(struct btrfs_block_group_cache *cache);
2706 void btrfs_create_pending_block_groups(struct btrfs_trans_handle *trans);
2707 u64 btrfs_data_alloc_profile(struct btrfs_fs_info *fs_info);
2708 u64 btrfs_metadata_alloc_profile(struct btrfs_fs_info *fs_info);
2709 u64 btrfs_system_alloc_profile(struct btrfs_fs_info *fs_info);
2710 void btrfs_clear_space_info_full(struct btrfs_fs_info *info);
2711
2712 enum btrfs_reserve_flush_enum {
2713         /* If we are in the transaction, we can't flush anything.*/
2714         BTRFS_RESERVE_NO_FLUSH,
2715         /*
2716          * Flushing delalloc may cause deadlock somewhere, in this
2717          * case, use FLUSH LIMIT
2718          */
2719         BTRFS_RESERVE_FLUSH_LIMIT,
2720         BTRFS_RESERVE_FLUSH_ALL,
2721 };
2722
2723 enum btrfs_flush_state {
2724         FLUSH_DELAYED_ITEMS_NR  =       1,
2725         FLUSH_DELAYED_ITEMS     =       2,
2726         FLUSH_DELALLOC          =       3,
2727         FLUSH_DELALLOC_WAIT     =       4,
2728         ALLOC_CHUNK             =       5,
2729         COMMIT_TRANS            =       6,
2730 };
2731
2732 int btrfs_alloc_data_chunk_ondemand(struct btrfs_inode *inode, u64 bytes);
2733 int btrfs_check_data_free_space(struct inode *inode,
2734                         struct extent_changeset **reserved, u64 start, u64 len);
2735 void btrfs_free_reserved_data_space(struct inode *inode,
2736                         struct extent_changeset *reserved, u64 start, u64 len);
2737 void btrfs_delalloc_release_space(struct inode *inode,
2738                                   struct extent_changeset *reserved,
2739                                   u64 start, u64 len, bool qgroup_free);
2740 void btrfs_free_reserved_data_space_noquota(struct inode *inode, u64 start,
2741                                             u64 len);
2742 void btrfs_trans_release_chunk_metadata(struct btrfs_trans_handle *trans);
2743 int btrfs_subvolume_reserve_metadata(struct btrfs_root *root,
2744                                      struct btrfs_block_rsv *rsv,
2745                                      int nitems, bool use_global_rsv);
2746 void btrfs_subvolume_release_metadata(struct btrfs_fs_info *fs_info,
2747                                       struct btrfs_block_rsv *rsv);
2748 void btrfs_delalloc_release_extents(struct btrfs_inode *inode, u64 num_bytes);
2749
2750 int btrfs_delalloc_reserve_metadata(struct btrfs_inode *inode, u64 num_bytes);
2751 void btrfs_delalloc_release_metadata(struct btrfs_inode *inode, u64 num_bytes,
2752                                      bool qgroup_free);
2753 int btrfs_delalloc_reserve_space(struct inode *inode,
2754                         struct extent_changeset **reserved, u64 start, u64 len);
2755 void btrfs_init_block_rsv(struct btrfs_block_rsv *rsv, unsigned short type);
2756 struct btrfs_block_rsv *btrfs_alloc_block_rsv(struct btrfs_fs_info *fs_info,
2757                                               unsigned short type);
2758 void btrfs_init_metadata_block_rsv(struct btrfs_fs_info *fs_info,
2759                                    struct btrfs_block_rsv *rsv,
2760                                    unsigned short type);
2761 void btrfs_free_block_rsv(struct btrfs_fs_info *fs_info,
2762                           struct btrfs_block_rsv *rsv);
2763 int btrfs_block_rsv_add(struct btrfs_root *root,
2764                         struct btrfs_block_rsv *block_rsv, u64 num_bytes,
2765                         enum btrfs_reserve_flush_enum flush);
2766 int btrfs_block_rsv_check(struct btrfs_block_rsv *block_rsv, int min_factor);
2767 int btrfs_block_rsv_refill(struct btrfs_root *root,
2768                            struct btrfs_block_rsv *block_rsv, u64 min_reserved,
2769                            enum btrfs_reserve_flush_enum flush);
2770 int btrfs_block_rsv_migrate(struct btrfs_block_rsv *src_rsv,
2771                             struct btrfs_block_rsv *dst_rsv, u64 num_bytes,
2772                             int update_size);
2773 int btrfs_cond_migrate_bytes(struct btrfs_fs_info *fs_info,
2774                              struct btrfs_block_rsv *dest, u64 num_bytes,
2775                              int min_factor);
2776 void btrfs_block_rsv_release(struct btrfs_fs_info *fs_info,
2777                              struct btrfs_block_rsv *block_rsv,
2778                              u64 num_bytes);
2779 int btrfs_inc_block_group_ro(struct btrfs_block_group_cache *cache);
2780 void btrfs_dec_block_group_ro(struct btrfs_block_group_cache *cache);
2781 void btrfs_put_block_group_cache(struct btrfs_fs_info *info);
2782 u64 btrfs_account_ro_block_groups_free_space(struct btrfs_space_info *sinfo);
2783 int btrfs_error_unpin_extent_range(struct btrfs_fs_info *fs_info,
2784                                    u64 start, u64 end);
2785 int btrfs_discard_extent(struct btrfs_fs_info *fs_info, u64 bytenr,
2786                          u64 num_bytes, u64 *actual_bytes);
2787 int btrfs_force_chunk_alloc(struct btrfs_trans_handle *trans, u64 type);
2788 int btrfs_trim_fs(struct btrfs_fs_info *fs_info, struct fstrim_range *range);
2789
2790 int btrfs_init_space_info(struct btrfs_fs_info *fs_info);
2791 int btrfs_delayed_refs_qgroup_accounting(struct btrfs_trans_handle *trans,
2792                                          struct btrfs_fs_info *fs_info);
2793 int btrfs_start_write_no_snapshotting(struct btrfs_root *root);
2794 void btrfs_end_write_no_snapshotting(struct btrfs_root *root);
2795 void btrfs_wait_for_snapshot_creation(struct btrfs_root *root);
2796 void check_system_chunk(struct btrfs_trans_handle *trans, const u64 type);
2797 u64 add_new_free_space(struct btrfs_block_group_cache *block_group,
2798                        u64 start, u64 end);
2799 void btrfs_mark_bg_unused(struct btrfs_block_group_cache *bg);
2800
2801 /* ctree.c */
2802 int btrfs_bin_search(struct extent_buffer *eb, const struct btrfs_key *key,
2803                      int level, int *slot);
2804 int btrfs_comp_cpu_keys(const struct btrfs_key *k1, const struct btrfs_key *k2);
2805 int btrfs_previous_item(struct btrfs_root *root,
2806                         struct btrfs_path *path, u64 min_objectid,
2807                         int type);
2808 int btrfs_previous_extent_item(struct btrfs_root *root,
2809                         struct btrfs_path *path, u64 min_objectid);
2810 void btrfs_set_item_key_safe(struct btrfs_fs_info *fs_info,
2811                              struct btrfs_path *path,
2812                              const struct btrfs_key *new_key);
2813 struct extent_buffer *btrfs_root_node(struct btrfs_root *root);
2814 struct extent_buffer *btrfs_lock_root_node(struct btrfs_root *root);
2815 struct extent_buffer *btrfs_read_lock_root_node(struct btrfs_root *root);
2816 int btrfs_find_next_key(struct btrfs_root *root, struct btrfs_path *path,
2817                         struct btrfs_key *key, int lowest_level,
2818                         u64 min_trans);
2819 int btrfs_search_forward(struct btrfs_root *root, struct btrfs_key *min_key,
2820                          struct btrfs_path *path,
2821                          u64 min_trans);
2822 enum btrfs_compare_tree_result {
2823         BTRFS_COMPARE_TREE_NEW,
2824         BTRFS_COMPARE_TREE_DELETED,
2825         BTRFS_COMPARE_TREE_CHANGED,
2826         BTRFS_COMPARE_TREE_SAME,
2827 };
2828 typedef int (*btrfs_changed_cb_t)(struct btrfs_path *left_path,
2829                                   struct btrfs_path *right_path,
2830                                   struct btrfs_key *key,
2831                                   enum btrfs_compare_tree_result result,
2832                                   void *ctx);
2833 int btrfs_compare_trees(struct btrfs_root *left_root,
2834                         struct btrfs_root *right_root,
2835                         btrfs_changed_cb_t cb, void *ctx);
2836 int btrfs_cow_block(struct btrfs_trans_handle *trans,
2837                     struct btrfs_root *root, struct extent_buffer *buf,
2838                     struct extent_buffer *parent, int parent_slot,
2839                     struct extent_buffer **cow_ret);
2840 int btrfs_copy_root(struct btrfs_trans_handle *trans,
2841                       struct btrfs_root *root,
2842                       struct extent_buffer *buf,
2843                       struct extent_buffer **cow_ret, u64 new_root_objectid);
2844 int btrfs_block_can_be_shared(struct btrfs_root *root,
2845                               struct extent_buffer *buf);
2846 void btrfs_extend_item(struct btrfs_fs_info *fs_info, struct btrfs_path *path,
2847                        u32 data_size);
2848 void btrfs_truncate_item(struct btrfs_fs_info *fs_info,
2849                          struct btrfs_path *path, u32 new_size, int from_end);
2850 int btrfs_split_item(struct btrfs_trans_handle *trans,
2851                      struct btrfs_root *root,
2852                      struct btrfs_path *path,
2853                      const struct btrfs_key *new_key,
2854                      unsigned long split_offset);
2855 int btrfs_duplicate_item(struct btrfs_trans_handle *trans,
2856                          struct btrfs_root *root,
2857                          struct btrfs_path *path,
2858                          const struct btrfs_key *new_key);
2859 int btrfs_find_item(struct btrfs_root *fs_root, struct btrfs_path *path,
2860                 u64 inum, u64 ioff, u8 key_type, struct btrfs_key *found_key);
2861 int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2862                       const struct btrfs_key *key, struct btrfs_path *p,
2863                       int ins_len, int cow);
2864 int btrfs_search_old_slot(struct btrfs_root *root, const struct btrfs_key *key,
2865                           struct btrfs_path *p, u64 time_seq);
2866 int btrfs_search_slot_for_read(struct btrfs_root *root,
2867                                const struct btrfs_key *key,
2868                                struct btrfs_path *p, int find_higher,
2869                                int return_any);
2870 int btrfs_realloc_node(struct btrfs_trans_handle *trans,
2871                        struct btrfs_root *root, struct extent_buffer *parent,
2872                        int start_slot, u64 *last_ret,
2873                        struct btrfs_key *progress);
2874 void btrfs_release_path(struct btrfs_path *p);
2875 struct btrfs_path *btrfs_alloc_path(void);
2876 void btrfs_free_path(struct btrfs_path *p);
2877 void btrfs_set_path_blocking(struct btrfs_path *p);
2878 void btrfs_clear_path_blocking(struct btrfs_path *p,
2879                                struct extent_buffer *held, int held_rw);
2880 void btrfs_unlock_up_safe(struct btrfs_path *p, int level);
2881
2882 int btrfs_del_items(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2883                    struct btrfs_path *path, int slot, int nr);
2884 static inline int btrfs_del_item(struct btrfs_trans_handle *trans,
2885                                  struct btrfs_root *root,
2886                                  struct btrfs_path *path)
2887 {
2888         return btrfs_del_items(trans, root, path, path->slots[0], 1);
2889 }
2890
2891 void setup_items_for_insert(struct btrfs_root *root, struct btrfs_path *path,
2892                             const struct btrfs_key *cpu_key, u32 *data_size,
2893                             u32 total_data, u32 total_size, int nr);
2894 int btrfs_insert_item(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2895                       const struct btrfs_key *key, void *data, u32 data_size);
2896 int btrfs_insert_empty_items(struct btrfs_trans_handle *trans,
2897                              struct btrfs_root *root,
2898                              struct btrfs_path *path,
2899                              const struct btrfs_key *cpu_key, u32 *data_size,
2900                              int nr);
2901
2902 static inline int btrfs_insert_empty_item(struct btrfs_trans_handle *trans,
2903                                           struct btrfs_root *root,
2904                                           struct btrfs_path *path,
2905                                           const struct btrfs_key *key,
2906                                           u32 data_size)
2907 {
2908         return btrfs_insert_empty_items(trans, root, path, key, &data_size, 1);
2909 }
2910
2911 int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path);
2912 int btrfs_prev_leaf(struct btrfs_root *root, struct btrfs_path *path);
2913 int btrfs_next_old_leaf(struct btrfs_root *root, struct btrfs_path *path,
2914                         u64 time_seq);
2915 static inline int btrfs_next_old_item(struct btrfs_root *root,
2916                                       struct btrfs_path *p, u64 time_seq)
2917 {
2918         ++p->slots[0];
2919         if (p->slots[0] >= btrfs_header_nritems(p->nodes[0]))
2920                 return btrfs_next_old_leaf(root, p, time_seq);
2921         return 0;
2922 }
2923 static inline int btrfs_next_item(struct btrfs_root *root, struct btrfs_path *p)
2924 {
2925         return btrfs_next_old_item(root, p, 0);
2926 }
2927 int btrfs_leaf_free_space(struct btrfs_fs_info *fs_info,
2928                           struct extent_buffer *leaf);
2929 int __must_check btrfs_drop_snapshot(struct btrfs_root *root,
2930                                      struct btrfs_block_rsv *block_rsv,
2931                                      int update_ref, int for_reloc);
2932 int btrfs_drop_subtree(struct btrfs_trans_handle *trans,
2933                         struct btrfs_root *root,
2934                         struct extent_buffer *node,
2935                         struct extent_buffer *parent);
2936 static inline int btrfs_fs_closing(struct btrfs_fs_info *fs_info)
2937 {
2938         /*
2939          * Do it this way so we only ever do one test_bit in the normal case.
2940          */
2941         if (test_bit(BTRFS_FS_CLOSING_START, &fs_info->flags)) {
2942                 if (test_bit(BTRFS_FS_CLOSING_DONE, &fs_info->flags))
2943                         return 2;
2944                 return 1;
2945         }
2946         return 0;
2947 }
2948
2949 /*
2950  * If we remount the fs to be R/O or umount the fs, the cleaner needn't do
2951  * anything except sleeping. This function is used to check the status of
2952  * the fs.
2953  */
2954 static inline int btrfs_need_cleaner_sleep(struct btrfs_fs_info *fs_info)
2955 {
2956         return fs_info->sb->s_flags & SB_RDONLY || btrfs_fs_closing(fs_info);
2957 }
2958
2959 static inline void free_fs_info(struct btrfs_fs_info *fs_info)
2960 {
2961         kfree(fs_info->balance_ctl);
2962         kfree(fs_info->delayed_root);
2963         kfree(fs_info->extent_root);
2964         kfree(fs_info->tree_root);
2965         kfree(fs_info->chunk_root);
2966         kfree(fs_info->dev_root);
2967         kfree(fs_info->csum_root);
2968         kfree(fs_info->quota_root);
2969         kfree(fs_info->uuid_root);
2970         kfree(fs_info->free_space_root);
2971         kfree(fs_info->super_copy);
2972         kfree(fs_info->super_for_commit);
2973         security_free_mnt_opts(&fs_info->security_opts);
2974         kvfree(fs_info);
2975 }
2976
2977 /* tree mod log functions from ctree.c */
2978 u64 btrfs_get_tree_mod_seq(struct btrfs_fs_info *fs_info,
2979                            struct seq_list *elem);
2980 void btrfs_put_tree_mod_seq(struct btrfs_fs_info *fs_info,
2981                             struct seq_list *elem);
2982 int btrfs_old_root_level(struct btrfs_root *root, u64 time_seq);
2983
2984 /* root-item.c */
2985 int btrfs_add_root_ref(struct btrfs_trans_handle *trans, u64 root_id,
2986                        u64 ref_id, u64 dirid, u64 sequence, const char *name,
2987                        int name_len);
2988 int btrfs_del_root_ref(struct btrfs_trans_handle *trans, u64 root_id,
2989                        u64 ref_id, u64 dirid, u64 *sequence, const char *name,
2990                        int name_len);
2991 int btrfs_del_root(struct btrfs_trans_handle *trans,
2992                    const struct btrfs_key *key);
2993 int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2994                       const struct btrfs_key *key,
2995                       struct btrfs_root_item *item);
2996 int __must_check btrfs_update_root(struct btrfs_trans_handle *trans,
2997                                    struct btrfs_root *root,
2998                                    struct btrfs_key *key,
2999                                    struct btrfs_root_item *item);
3000 int btrfs_find_root(struct btrfs_root *root, const struct btrfs_key *search_key,
3001                     struct btrfs_path *path, struct btrfs_root_item *root_item,
3002                     struct btrfs_key *root_key);
3003 int btrfs_find_orphan_roots(struct btrfs_fs_info *fs_info);
3004 void btrfs_set_root_node(struct btrfs_root_item *item,
3005                          struct extent_buffer *node);
3006 void btrfs_check_and_init_root_item(struct btrfs_root_item *item);
3007 void btrfs_update_root_times(struct btrfs_trans_handle *trans,
3008                              struct btrfs_root *root);
3009
3010 /* uuid-tree.c */
3011 int btrfs_uuid_tree_add(struct btrfs_trans_handle *trans, u8 *uuid, u8 type,
3012                         u64 subid);
3013 int btrfs_uuid_tree_remove(struct btrfs_trans_handle *trans, u8 *uuid, u8 type,
3014                         u64 subid);
3015 int btrfs_uuid_tree_iterate(struct btrfs_fs_info *fs_info,
3016                             int (*check_func)(struct btrfs_fs_info *, u8 *, u8,
3017                                               u64));
3018
3019 /* dir-item.c */
3020 int btrfs_check_dir_item_collision(struct btrfs_root *root, u64 dir,
3021                           const char *name, int name_len);
3022 int btrfs_insert_dir_item(struct btrfs_trans_handle *trans,
3023                           struct btrfs_root *root, const char *name,
3024                           int name_len, struct btrfs_inode *dir,
3025                           struct btrfs_key *location, u8 type, u64 index);
3026 struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans,
3027                                              struct btrfs_root *root,
3028                                              struct btrfs_path *path, u64 dir,
3029                                              const char *name, int name_len,
3030                                              int mod);
3031 struct btrfs_dir_item *
3032 btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans,
3033                             struct btrfs_root *root,
3034                             struct btrfs_path *path, u64 dir,
3035                             u64 objectid, const char *name, int name_len,
3036                             int mod);
3037 struct btrfs_dir_item *
3038 btrfs_search_dir_index_item(struct btrfs_root *root,
3039                             struct btrfs_path *path, u64 dirid,
3040                             const char *name, int name_len);
3041 int btrfs_delete_one_dir_name(struct btrfs_trans_handle *trans,
3042                               struct btrfs_root *root,
3043                               struct btrfs_path *path,
3044                               struct btrfs_dir_item *di);
3045 int btrfs_insert_xattr_item(struct btrfs_trans_handle *trans,
3046                             struct btrfs_root *root,
3047                             struct btrfs_path *path, u64 objectid,
3048                             const char *name, u16 name_len,
3049                             const void *data, u16 data_len);
3050 struct btrfs_dir_item *btrfs_lookup_xattr(struct btrfs_trans_handle *trans,
3051                                           struct btrfs_root *root,
3052                                           struct btrfs_path *path, u64 dir,
3053                                           const char *name, u16 name_len,
3054                                           int mod);
3055 struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_fs_info *fs_info,
3056                                                  struct btrfs_path *path,
3057                                                  const char *name,
3058                                                  int name_len);
3059
3060 /* orphan.c */
3061 int btrfs_insert_orphan_item(struct btrfs_trans_handle *trans,
3062                              struct btrfs_root *root, u64 offset);
3063 int btrfs_del_orphan_item(struct btrfs_trans_handle *trans,
3064                           struct btrfs_root *root, u64 offset);
3065 int btrfs_find_orphan_item(struct btrfs_root *root, u64 offset);
3066
3067 /* inode-item.c */
3068 int btrfs_insert_inode_ref(struct btrfs_trans_handle *trans,
3069                            struct btrfs_root *root,
3070                            const char *name, int name_len,
3071                            u64 inode_objectid, u64 ref_objectid, u64 index);
3072 int btrfs_del_inode_ref(struct btrfs_trans_handle *trans,
3073                            struct btrfs_root *root,
3074                            const char *name, int name_len,
3075                            u64 inode_objectid, u64 ref_objectid, u64 *index);
3076 int btrfs_insert_empty_inode(struct btrfs_trans_handle *trans,
3077                              struct btrfs_root *root,
3078                              struct btrfs_path *path, u64 objectid);
3079 int btrfs_lookup_inode(struct btrfs_trans_handle *trans, struct btrfs_root
3080                        *root, struct btrfs_path *path,
3081                        struct btrfs_key *location, int mod);
3082
3083 struct btrfs_inode_extref *
3084 btrfs_lookup_inode_extref(struct btrfs_trans_handle *trans,
3085                           struct btrfs_root *root,
3086                           struct btrfs_path *path,
3087                           const char *name, int name_len,
3088                           u64 inode_objectid, u64 ref_objectid, int ins_len,
3089                           int cow);
3090
3091 int btrfs_find_name_in_backref(struct extent_buffer *leaf, int slot,
3092                                const char *name,
3093                                int name_len, struct btrfs_inode_ref **ref_ret);
3094 int btrfs_find_name_in_ext_backref(struct extent_buffer *leaf, int slot,
3095                                    u64 ref_objectid, const char *name,
3096                                    int name_len,
3097                                    struct btrfs_inode_extref **extref_ret);
3098
3099 /* file-item.c */
3100 struct btrfs_dio_private;
3101 int btrfs_del_csums(struct btrfs_trans_handle *trans,
3102                     struct btrfs_root *root, u64 bytenr, u64 len);
3103 blk_status_t btrfs_lookup_bio_sums(struct inode *inode, struct bio *bio, u32 *dst);
3104 blk_status_t btrfs_lookup_bio_sums_dio(struct inode *inode, struct bio *bio,
3105                               u64 logical_offset);
3106 int btrfs_insert_file_extent(struct btrfs_trans_handle *trans,
3107                              struct btrfs_root *root,
3108                              u64 objectid, u64 pos,
3109                              u64 disk_offset, u64 disk_num_bytes,
3110                              u64 num_bytes, u64 offset, u64 ram_bytes,
3111                              u8 compression, u8 encryption, u16 other_encoding);
3112 int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
3113                              struct btrfs_root *root,
3114                              struct btrfs_path *path, u64 objectid,
3115                              u64 bytenr, int mod);
3116 int btrfs_csum_file_blocks(struct btrfs_trans_handle *trans,
3117                            struct btrfs_root *root,
3118                            struct btrfs_ordered_sum *sums);
3119 blk_status_t btrfs_csum_one_bio(struct inode *inode, struct bio *bio,
3120                        u64 file_start, int contig);
3121 int btrfs_lookup_csums_range(struct btrfs_root *root, u64 start, u64 end,
3122                              struct list_head *list, int search_commit);
3123 void btrfs_extent_item_to_extent_map(struct btrfs_inode *inode,
3124                                      const struct btrfs_path *path,
3125                                      struct btrfs_file_extent_item *fi,
3126                                      const bool new_inline,
3127                                      struct extent_map *em);
3128
3129 /* inode.c */
3130 struct extent_map *btrfs_get_extent_fiemap(struct btrfs_inode *inode,
3131                 struct page *page, size_t pg_offset, u64 start,
3132                 u64 len, int create);
3133 noinline int can_nocow_extent(struct inode *inode, u64 offset, u64 *len,
3134                               u64 *orig_start, u64 *orig_block_len,
3135                               u64 *ram_bytes);
3136
3137 void __btrfs_del_delalloc_inode(struct btrfs_root *root,
3138                                 struct btrfs_inode *inode);
3139 struct inode *btrfs_lookup_dentry(struct inode *dir, struct dentry *dentry);
3140 int btrfs_set_inode_index(struct btrfs_inode *dir, u64 *index);
3141 int btrfs_unlink_inode(struct btrfs_trans_handle *trans,
3142                        struct btrfs_root *root,
3143                        struct btrfs_inode *dir, struct btrfs_inode *inode,
3144                        const char *name, int name_len);
3145 int btrfs_add_link(struct btrfs_trans_handle *trans,
3146                    struct btrfs_inode *parent_inode, struct btrfs_inode *inode,
3147                    const char *name, int name_len, int add_backref, u64 index);
3148 int btrfs_delete_subvolume(struct inode *dir, struct dentry *dentry);
3149 int btrfs_truncate_block(struct inode *inode, loff_t from, loff_t len,
3150                         int front);
3151 int btrfs_truncate_inode_items(struct btrfs_trans_handle *trans,
3152                                struct btrfs_root *root,
3153                                struct inode *inode, u64 new_size,
3154                                u32 min_type);
3155
3156 int btrfs_start_delalloc_snapshot(struct btrfs_root *root);
3157 int btrfs_start_delalloc_roots(struct btrfs_fs_info *fs_info, int nr);
3158 int btrfs_set_extent_delalloc(struct inode *inode, u64 start, u64 end,
3159                               unsigned int extra_bits,
3160                               struct extent_state **cached_state, int dedupe);
3161 int btrfs_create_subvol_root(struct btrfs_trans_handle *trans,
3162                              struct btrfs_root *new_root,
3163                              struct btrfs_root *parent_root,
3164                              u64 new_dirid);
3165 int btrfs_merge_bio_hook(struct page *page, unsigned long offset,
3166                          size_t size, struct bio *bio,
3167                          unsigned long bio_flags);
3168 void btrfs_set_range_writeback(struct extent_io_tree *tree, u64 start, u64 end);
3169 vm_fault_t btrfs_page_mkwrite(struct vm_fault *vmf);
3170 int btrfs_readpage(struct file *file, struct page *page);
3171 void btrfs_evict_inode(struct inode *inode);
3172 int btrfs_write_inode(struct inode *inode, struct writeback_control *wbc);
3173 struct inode *btrfs_alloc_inode(struct super_block *sb);
3174 void btrfs_destroy_inode(struct inode *inode);
3175 int btrfs_drop_inode(struct inode *inode);
3176 int __init btrfs_init_cachep(void);
3177 void __cold btrfs_destroy_cachep(void);
3178 struct inode *btrfs_iget_path(struct super_block *s, struct btrfs_key *location,
3179                               struct btrfs_root *root, int *new,
3180                               struct btrfs_path *path);
3181 struct inode *btrfs_iget(struct super_block *s, struct btrfs_key *location,
3182                          struct btrfs_root *root, int *was_new);
3183 struct extent_map *btrfs_get_extent(struct btrfs_inode *inode,
3184                 struct page *page, size_t pg_offset,
3185                 u64 start, u64 end, int create);
3186 int btrfs_update_inode(struct btrfs_trans_handle *trans,
3187                               struct btrfs_root *root,
3188                               struct inode *inode);
3189 int btrfs_update_inode_fallback(struct btrfs_trans_handle *trans,
3190                                 struct btrfs_root *root, struct inode *inode);
3191 int btrfs_orphan_add(struct btrfs_trans_handle *trans,
3192                 struct btrfs_inode *inode);
3193 int btrfs_orphan_cleanup(struct btrfs_root *root);
3194 int btrfs_cont_expand(struct inode *inode, loff_t oldsize, loff_t size);
3195 void btrfs_add_delayed_iput(struct inode *inode);
3196 void btrfs_run_delayed_iputs(struct btrfs_fs_info *fs_info);
3197 int btrfs_prealloc_file_range(struct inode *inode, int mode,
3198                               u64 start, u64 num_bytes, u64 min_size,
3199                               loff_t actual_len, u64 *alloc_hint);
3200 int btrfs_prealloc_file_range_trans(struct inode *inode,
3201                                     struct btrfs_trans_handle *trans, int mode,
3202                                     u64 start, u64 num_bytes, u64 min_size,
3203                                     loff_t actual_len, u64 *alloc_hint);
3204 int btrfs_run_delalloc_range(void *private_data, struct page *locked_page,
3205                 u64 start, u64 end, int *page_started, unsigned long *nr_written,
3206                 struct writeback_control *wbc);
3207 extern const struct dentry_operations btrfs_dentry_operations;
3208 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
3209 void btrfs_test_inode_set_ops(struct inode *inode);
3210 #endif
3211
3212 /* ioctl.c */
3213 long btrfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
3214 long btrfs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
3215 int btrfs_ioctl_get_supported_features(void __user *arg);
3216 void btrfs_sync_inode_flags_to_i_flags(struct inode *inode);
3217 int btrfs_is_empty_uuid(u8 *uuid);
3218 int btrfs_defrag_file(struct inode *inode, struct file *file,
3219                       struct btrfs_ioctl_defrag_range_args *range,
3220                       u64 newer_than, unsigned long max_pages);
3221 void btrfs_get_block_group_info(struct list_head *groups_list,
3222                                 struct btrfs_ioctl_space_info *space);
3223 void btrfs_update_ioctl_balance_args(struct btrfs_fs_info *fs_info,
3224                                struct btrfs_ioctl_balance_args *bargs);
3225 int btrfs_dedupe_file_range(struct file *src_file, loff_t src_loff,
3226                             struct file *dst_file, loff_t dst_loff,
3227                             u64 olen);
3228
3229 /* file.c */
3230 int __init btrfs_auto_defrag_init(void);
3231 void __cold btrfs_auto_defrag_exit(void);
3232 int btrfs_add_inode_defrag(struct btrfs_trans_handle *trans,
3233                            struct btrfs_inode *inode);
3234 int btrfs_run_defrag_inodes(struct btrfs_fs_info *fs_info);
3235 void btrfs_cleanup_defrag_inodes(struct btrfs_fs_info *fs_info);
3236 int btrfs_sync_file(struct file *file, loff_t start, loff_t end, int datasync);
3237 void btrfs_drop_extent_cache(struct btrfs_inode *inode, u64 start, u64 end,
3238                              int skip_pinned);
3239 extern const struct file_operations btrfs_file_operations;
3240 int __btrfs_drop_extents(struct btrfs_trans_handle *trans,
3241                          struct btrfs_root *root, struct inode *inode,
3242                          struct btrfs_path *path, u64 start, u64 end,
3243                          u64 *drop_end, int drop_cache,
3244                          int replace_extent,
3245                          u32 extent_item_size,
3246                          int *key_inserted);
3247 int btrfs_drop_extents(struct btrfs_trans_handle *trans,
3248                        struct btrfs_root *root, struct inode *inode, u64 start,
3249                        u64 end, int drop_cache);
3250 int btrfs_mark_extent_written(struct btrfs_trans_handle *trans,
3251                               struct btrfs_inode *inode, u64 start, u64 end);
3252 int btrfs_release_file(struct inode *inode, struct file *file);
3253 int btrfs_dirty_pages(struct inode *inode, struct page **pages,
3254                       size_t num_pages, loff_t pos, size_t write_bytes,
3255                       struct extent_state **cached);
3256 int btrfs_fdatawrite_range(struct inode *inode, loff_t start, loff_t end);
3257 int btrfs_clone_file_range(struct file *file_in, loff_t pos_in,
3258                            struct file *file_out, loff_t pos_out, u64 len);
3259
3260 /* tree-defrag.c */
3261 int btrfs_defrag_leaves(struct btrfs_trans_handle *trans,
3262                         struct btrfs_root *root);
3263
3264 /* sysfs.c */
3265 int __init btrfs_init_sysfs(void);
3266 void __cold btrfs_exit_sysfs(void);
3267 int btrfs_sysfs_add_mounted(struct btrfs_fs_info *fs_info);
3268 void btrfs_sysfs_remove_mounted(struct btrfs_fs_info *fs_info);
3269
3270 /* super.c */
3271 int btrfs_parse_options(struct btrfs_fs_info *info, char *options,
3272                         unsigned long new_flags);
3273 int btrfs_sync_fs(struct super_block *sb, int wait);
3274
3275 static inline __printf(2, 3) __cold
3276 void btrfs_no_printk(const struct btrfs_fs_info *fs_info, const char *fmt, ...)
3277 {
3278 }
3279
3280 #ifdef CONFIG_PRINTK
3281 __printf(2, 3)
3282 __cold
3283 void btrfs_printk(const struct btrfs_fs_info *fs_info, const char *fmt, ...);
3284 #else
3285 #define btrfs_printk(fs_info, fmt, args...) \
3286         btrfs_no_printk(fs_info, fmt, ##args)
3287 #endif
3288
3289 #define btrfs_emerg(fs_info, fmt, args...) \
3290         btrfs_printk(fs_info, KERN_EMERG fmt, ##args)
3291 #define btrfs_alert(fs_info, fmt, args...) \
3292         btrfs_printk(fs_info, KERN_ALERT fmt, ##args)
3293 #define btrfs_crit(fs_info, fmt, args...) \
3294         btrfs_printk(fs_info, KERN_CRIT fmt, ##args)
3295 #define btrfs_err(fs_info, fmt, args...) \
3296         btrfs_printk(fs_info, KERN_ERR fmt, ##args)
3297 #define btrfs_warn(fs_info, fmt, args...) \
3298         btrfs_printk(fs_info, KERN_WARNING fmt, ##args)
3299 #define btrfs_notice(fs_info, fmt, args...) \
3300         btrfs_printk(fs_info, KERN_NOTICE fmt, ##args)
3301 #define btrfs_info(fs_info, fmt, args...) \
3302         btrfs_printk(fs_info, KERN_INFO fmt, ##args)
3303
3304 /*
3305  * Wrappers that use printk_in_rcu
3306  */
3307 #define btrfs_emerg_in_rcu(fs_info, fmt, args...) \
3308         btrfs_printk_in_rcu(fs_info, KERN_EMERG fmt, ##args)
3309 #define btrfs_alert_in_rcu(fs_info, fmt, args...) \
3310         btrfs_printk_in_rcu(fs_info, KERN_ALERT fmt, ##args)
3311 #define btrfs_crit_in_rcu(fs_info, fmt, args...) \
3312         btrfs_printk_in_rcu(fs_info, KERN_CRIT fmt, ##args)
3313 #define btrfs_err_in_rcu(fs_info, fmt, args...) \
3314         btrfs_printk_in_rcu(fs_info, KERN_ERR fmt, ##args)
3315 #define btrfs_warn_in_rcu(fs_info, fmt, args...) \
3316         btrfs_printk_in_rcu(fs_info, KERN_WARNING fmt, ##args)
3317 #define btrfs_notice_in_rcu(fs_info, fmt, args...) \
3318         btrfs_printk_in_rcu(fs_info, KERN_NOTICE fmt, ##args)
3319 #define btrfs_info_in_rcu(fs_info, fmt, args...) \
3320         btrfs_printk_in_rcu(fs_info, KERN_INFO fmt, ##args)
3321
3322 /*
3323  * Wrappers that use a ratelimited printk_in_rcu
3324  */
3325 #define btrfs_emerg_rl_in_rcu(fs_info, fmt, args...) \
3326         btrfs_printk_rl_in_rcu(fs_info, KERN_EMERG fmt, ##args)
3327 #define btrfs_alert_rl_in_rcu(fs_info, fmt, args...) \
3328         btrfs_printk_rl_in_rcu(fs_info, KERN_ALERT fmt, ##args)
3329 #define btrfs_crit_rl_in_rcu(fs_info, fmt, args...) \
3330         btrfs_printk_rl_in_rcu(fs_info, KERN_CRIT fmt, ##args)
3331 #define btrfs_err_rl_in_rcu(fs_info, fmt, args...) \
3332         btrfs_printk_rl_in_rcu(fs_info, KERN_ERR fmt, ##args)
3333 #define btrfs_warn_rl_in_rcu(fs_info, fmt, args...) \
3334         btrfs_printk_rl_in_rcu(fs_info, KERN_WARNING fmt, ##args)
3335 #define btrfs_notice_rl_in_rcu(fs_info, fmt, args...) \
3336         btrfs_printk_rl_in_rcu(fs_info, KERN_NOTICE fmt, ##args)
3337 #define btrfs_info_rl_in_rcu(fs_info, fmt, args...) \
3338         btrfs_printk_rl_in_rcu(fs_info, KERN_INFO fmt, ##args)
3339
3340 /*
3341  * Wrappers that use a ratelimited printk
3342  */
3343 #define btrfs_emerg_rl(fs_info, fmt, args...) \
3344         btrfs_printk_ratelimited(fs_info, KERN_EMERG fmt, ##args)
3345 #define btrfs_alert_rl(fs_info, fmt, args...) \
3346         btrfs_printk_ratelimited(fs_info, KERN_ALERT fmt, ##args)
3347 #define btrfs_crit_rl(fs_info, fmt, args...) \
3348         btrfs_printk_ratelimited(fs_info, KERN_CRIT fmt, ##args)
3349 #define btrfs_err_rl(fs_info, fmt, args...) \
3350         btrfs_printk_ratelimited(fs_info, KERN_ERR fmt, ##args)
3351 #define btrfs_warn_rl(fs_info, fmt, args...) \
3352         btrfs_printk_ratelimited(fs_info, KERN_WARNING fmt, ##args)
3353 #define btrfs_notice_rl(fs_info, fmt, args...) \
3354         btrfs_printk_ratelimited(fs_info, KERN_NOTICE fmt, ##args)
3355 #define btrfs_info_rl(fs_info, fmt, args...) \
3356         btrfs_printk_ratelimited(fs_info, KERN_INFO fmt, ##args)
3357
3358 #if defined(CONFIG_DYNAMIC_DEBUG)
3359 #define btrfs_debug(fs_info, fmt, args...)                              \
3360 do {                                                                    \
3361         DEFINE_DYNAMIC_DEBUG_METADATA(descriptor, fmt);                 \
3362         if (unlikely(descriptor.flags & _DPRINTK_FLAGS_PRINT))          \
3363                 btrfs_printk(fs_info, KERN_DEBUG fmt, ##args);          \
3364 } while (0)
3365 #define btrfs_debug_in_rcu(fs_info, fmt, args...)                       \
3366 do {                                                                    \
3367         DEFINE_DYNAMIC_DEBUG_METADATA(descriptor, fmt);                 \
3368         if (unlikely(descriptor.flags & _DPRINTK_FLAGS_PRINT))          \
3369                 btrfs_printk_in_rcu(fs_info, KERN_DEBUG fmt, ##args);   \
3370 } while (0)
3371 #define btrfs_debug_rl_in_rcu(fs_info, fmt, args...)                    \
3372 do {                                                                    \
3373         DEFINE_DYNAMIC_DEBUG_METADATA(descriptor, fmt);                 \
3374         if (unlikely(descriptor.flags & _DPRINTK_FLAGS_PRINT))          \
3375                 btrfs_printk_rl_in_rcu(fs_info, KERN_DEBUG fmt,         \
3376                                        ##args);\
3377 } while (0)
3378 #define btrfs_debug_rl(fs_info, fmt, args...)                           \
3379 do {                                                                    \
3380         DEFINE_DYNAMIC_DEBUG_METADATA(descriptor, fmt);                 \
3381         if (unlikely(descriptor.flags & _DPRINTK_FLAGS_PRINT))          \
3382                 btrfs_printk_ratelimited(fs_info, KERN_DEBUG fmt,       \
3383                                          ##args);                       \
3384 } while (0)
3385 #elif defined(DEBUG)
3386 #define btrfs_debug(fs_info, fmt, args...) \
3387         btrfs_printk(fs_info, KERN_DEBUG fmt, ##args)
3388 #define btrfs_debug_in_rcu(fs_info, fmt, args...) \
3389         btrfs_printk_in_rcu(fs_info, KERN_DEBUG fmt, ##args)
3390 #define btrfs_debug_rl_in_rcu(fs_info, fmt, args...) \
3391         btrfs_printk_rl_in_rcu(fs_info, KERN_DEBUG fmt, ##args)
3392 #define btrfs_debug_rl(fs_info, fmt, args...) \
3393         btrfs_printk_ratelimited(fs_info, KERN_DEBUG fmt, ##args)
3394 #else
3395 #define btrfs_debug(fs_info, fmt, args...) \
3396         btrfs_no_printk(fs_info, KERN_DEBUG fmt, ##args)
3397 #define btrfs_debug_in_rcu(fs_info, fmt, args...) \
3398         btrfs_no_printk_in_rcu(fs_info, KERN_DEBUG fmt, ##args)
3399 #define btrfs_debug_rl_in_rcu(fs_info, fmt, args...) \
3400         btrfs_no_printk_in_rcu(fs_info, KERN_DEBUG fmt, ##args)
3401 #define btrfs_debug_rl(fs_info, fmt, args...) \
3402         btrfs_no_printk(fs_info, KERN_DEBUG fmt, ##args)
3403 #endif
3404
3405 #define btrfs_printk_in_rcu(fs_info, fmt, args...)      \
3406 do {                                                    \
3407         rcu_read_lock();                                \
3408         btrfs_printk(fs_info, fmt, ##args);             \
3409         rcu_read_unlock();                              \
3410 } while (0)
3411
3412 #define btrfs_no_printk_in_rcu(fs_info, fmt, args...)   \
3413 do {                                                    \
3414         rcu_read_lock();                                \
3415         btrfs_no_printk(fs_info, fmt, ##args);          \
3416         rcu_read_unlock();                              \
3417 } while (0)
3418
3419 #define btrfs_printk_ratelimited(fs_info, fmt, args...)         \
3420 do {                                                            \
3421         static DEFINE_RATELIMIT_STATE(_rs,                      \
3422                 DEFAULT_RATELIMIT_INTERVAL,                     \
3423                 DEFAULT_RATELIMIT_BURST);                       \
3424         if (__ratelimit(&_rs))                                  \
3425                 btrfs_printk(fs_info, fmt, ##args);             \
3426 } while (0)
3427
3428 #define btrfs_printk_rl_in_rcu(fs_info, fmt, args...)           \
3429 do {                                                            \
3430         rcu_read_lock();                                        \
3431         btrfs_printk_ratelimited(fs_info, fmt, ##args);         \
3432         rcu_read_unlock();                                      \
3433 } while (0)
3434
3435 #ifdef CONFIG_BTRFS_ASSERT
3436
3437 __cold
3438 static inline void assfail(const char *expr, const char *file, int line)
3439 {
3440         pr_err("assertion failed: %s, file: %s, line: %d\n",
3441                expr, file, line);
3442         BUG();
3443 }
3444
3445 #define ASSERT(expr)    \
3446         (likely(expr) ? (void)0 : assfail(#expr, __FILE__, __LINE__))
3447 #else
3448 #define ASSERT(expr)    ((void)0)
3449 #endif
3450
3451 __cold
3452 static inline void btrfs_print_v0_err(struct btrfs_fs_info *fs_info)
3453 {
3454         btrfs_err(fs_info,
3455 "Unsupported V0 extent filesystem detected. Aborting. Please re-create your filesystem with a newer kernel");
3456 }
3457
3458 __printf(5, 6)
3459 __cold
3460 void __btrfs_handle_fs_error(struct btrfs_fs_info *fs_info, const char *function,
3461                      unsigned int line, int errno, const char *fmt, ...);
3462
3463 const char *btrfs_decode_error(int errno);
3464
3465 __cold
3466 void __btrfs_abort_transaction(struct btrfs_trans_handle *trans,
3467                                const char *function,
3468                                unsigned int line, int errno);
3469
3470 /*
3471  * Call btrfs_abort_transaction as early as possible when an error condition is
3472  * detected, that way the exact line number is reported.
3473  */
3474 #define btrfs_abort_transaction(trans, errno)           \
3475 do {                                                            \
3476         /* Report first abort since mount */                    \
3477         if (!test_and_set_bit(BTRFS_FS_STATE_TRANS_ABORTED,     \
3478                         &((trans)->fs_info->fs_state))) {       \
3479                 if ((errno) != -EIO) {                          \
3480                         WARN(1, KERN_DEBUG                              \
3481                         "BTRFS: Transaction aborted (error %d)\n",      \
3482                         (errno));                                       \
3483                 } else {                                                \
3484                         btrfs_debug((trans)->fs_info,                   \
3485                                     "Transaction aborted (error %d)", \
3486                                   (errno));                     \
3487                 }                                               \
3488         }                                                       \
3489         __btrfs_abort_transaction((trans), __func__,            \
3490                                   __LINE__, (errno));           \
3491 } while (0)
3492
3493 #define btrfs_handle_fs_error(fs_info, errno, fmt, args...)             \
3494 do {                                                            \
3495         __btrfs_handle_fs_error((fs_info), __func__, __LINE__,  \
3496                           (errno), fmt, ##args);                \
3497 } while (0)
3498
3499 __printf(5, 6)
3500 __cold
3501 void __btrfs_panic(struct btrfs_fs_info *fs_info, const char *function,
3502                    unsigned int line, int errno, const char *fmt, ...);
3503 /*
3504  * If BTRFS_MOUNT_PANIC_ON_FATAL_ERROR is in mount_opt, __btrfs_panic
3505  * will panic().  Otherwise we BUG() here.
3506  */
3507 #define btrfs_panic(fs_info, errno, fmt, args...)                       \
3508 do {                                                                    \
3509         __btrfs_panic(fs_info, __func__, __LINE__, errno, fmt, ##args); \
3510         BUG();                                                          \
3511 } while (0)
3512
3513
3514 /* compatibility and incompatibility defines */
3515
3516 #define btrfs_set_fs_incompat(__fs_info, opt) \
3517         __btrfs_set_fs_incompat((__fs_info), BTRFS_FEATURE_INCOMPAT_##opt)
3518
3519 static inline void __btrfs_set_fs_incompat(struct btrfs_fs_info *fs_info,
3520                                            u64 flag)
3521 {
3522         struct btrfs_super_block *disk_super;
3523         u64 features;
3524
3525         disk_super = fs_info->super_copy;
3526         features = btrfs_super_incompat_flags(disk_super);
3527         if (!(features & flag)) {
3528                 spin_lock(&fs_info->super_lock);
3529                 features = btrfs_super_incompat_flags(disk_super);
3530                 if (!(features & flag)) {
3531                         features |= flag;
3532                         btrfs_set_super_incompat_flags(disk_super, features);
3533                         btrfs_info(fs_info, "setting %llu feature flag",
3534                                          flag);
3535                 }
3536                 spin_unlock(&fs_info->super_lock);
3537         }
3538 }
3539
3540 #define btrfs_clear_fs_incompat(__fs_info, opt) \
3541         __btrfs_clear_fs_incompat((__fs_info), BTRFS_FEATURE_INCOMPAT_##opt)
3542
3543 static inline void __btrfs_clear_fs_incompat(struct btrfs_fs_info *fs_info,
3544                                              u64 flag)
3545 {
3546         struct btrfs_super_block *disk_super;
3547         u64 features;
3548
3549         disk_super = fs_info->super_copy;
3550         features = btrfs_super_incompat_flags(disk_super);
3551         if (features & flag) {
3552                 spin_lock(&fs_info->super_lock);
3553                 features = btrfs_super_incompat_flags(disk_super);
3554                 if (features & flag) {
3555                         features &= ~flag;
3556                         btrfs_set_super_incompat_flags(disk_super, features);
3557                         btrfs_info(fs_info, "clearing %llu feature flag",
3558                                          flag);
3559                 }
3560                 spin_unlock(&fs_info->super_lock);
3561         }
3562 }
3563
3564 #define btrfs_fs_incompat(fs_info, opt) \
3565         __btrfs_fs_incompat((fs_info), BTRFS_FEATURE_INCOMPAT_##opt)
3566
3567 static inline bool __btrfs_fs_incompat(struct btrfs_fs_info *fs_info, u64 flag)
3568 {
3569         struct btrfs_super_block *disk_super;
3570         disk_super = fs_info->super_copy;
3571         return !!(btrfs_super_incompat_flags(disk_super) & flag);
3572 }
3573
3574 #define btrfs_set_fs_compat_ro(__fs_info, opt) \
3575         __btrfs_set_fs_compat_ro((__fs_info), BTRFS_FEATURE_COMPAT_RO_##opt)
3576
3577 static inline void __btrfs_set_fs_compat_ro(struct btrfs_fs_info *fs_info,
3578                                             u64 flag)
3579 {
3580         struct btrfs_super_block *disk_super;
3581         u64 features;
3582
3583         disk_super = fs_info->super_copy;
3584         features = btrfs_super_compat_ro_flags(disk_super);
3585         if (!(features & flag)) {
3586                 spin_lock(&fs_info->super_lock);
3587                 features = btrfs_super_compat_ro_flags(disk_super);
3588                 if (!(features & flag)) {
3589                         features |= flag;
3590                         btrfs_set_super_compat_ro_flags(disk_super, features);
3591                         btrfs_info(fs_info, "setting %llu ro feature flag",
3592                                    flag);
3593                 }
3594                 spin_unlock(&fs_info->super_lock);
3595         }
3596 }
3597
3598 #define btrfs_clear_fs_compat_ro(__fs_info, opt) \
3599         __btrfs_clear_fs_compat_ro((__fs_info), BTRFS_FEATURE_COMPAT_RO_##opt)
3600
3601 static inline void __btrfs_clear_fs_compat_ro(struct btrfs_fs_info *fs_info,
3602                                               u64 flag)
3603 {
3604         struct btrfs_super_block *disk_super;
3605         u64 features;
3606
3607         disk_super = fs_info->super_copy;
3608         features = btrfs_super_compat_ro_flags(disk_super);
3609         if (features & flag) {
3610                 spin_lock(&fs_info->super_lock);
3611                 features = btrfs_super_compat_ro_flags(disk_super);
3612                 if (features & flag) {
3613                         features &= ~flag;
3614                         btrfs_set_super_compat_ro_flags(disk_super, features);
3615                         btrfs_info(fs_info, "clearing %llu ro feature flag",
3616                                    flag);
3617                 }
3618                 spin_unlock(&fs_info->super_lock);
3619         }
3620 }
3621
3622 #define btrfs_fs_compat_ro(fs_info, opt) \
3623         __btrfs_fs_compat_ro((fs_info), BTRFS_FEATURE_COMPAT_RO_##opt)
3624
3625 static inline int __btrfs_fs_compat_ro(struct btrfs_fs_info *fs_info, u64 flag)
3626 {
3627         struct btrfs_super_block *disk_super;
3628         disk_super = fs_info->super_copy;
3629         return !!(btrfs_super_compat_ro_flags(disk_super) & flag);
3630 }
3631
3632 /* acl.c */
3633 #ifdef CONFIG_BTRFS_FS_POSIX_ACL
3634 struct posix_acl *btrfs_get_acl(struct inode *inode, int type);
3635 int btrfs_set_acl(struct inode *inode, struct posix_acl *acl, int type);
3636 int btrfs_init_acl(struct btrfs_trans_handle *trans,
3637                    struct inode *inode, struct inode *dir);
3638 #else
3639 #define btrfs_get_acl NULL
3640 #define btrfs_set_acl NULL
3641 static inline int btrfs_init_acl(struct btrfs_trans_handle *trans,
3642                                  struct inode *inode, struct inode *dir)
3643 {
3644         return 0;
3645 }
3646 #endif
3647
3648 /* relocation.c */
3649 int btrfs_relocate_block_group(struct btrfs_fs_info *fs_info, u64 group_start);
3650 int btrfs_init_reloc_root(struct btrfs_trans_handle *trans,
3651                           struct btrfs_root *root);
3652 int btrfs_update_reloc_root(struct btrfs_trans_handle *trans,
3653                             struct btrfs_root *root);
3654 int btrfs_recover_relocation(struct btrfs_root *root);
3655 int btrfs_reloc_clone_csums(struct inode *inode, u64 file_pos, u64 len);
3656 int btrfs_reloc_cow_block(struct btrfs_trans_handle *trans,
3657                           struct btrfs_root *root, struct extent_buffer *buf,
3658                           struct extent_buffer *cow);
3659 void btrfs_reloc_pre_snapshot(struct btrfs_pending_snapshot *pending,
3660                               u64 *bytes_to_reserve);
3661 int btrfs_reloc_post_snapshot(struct btrfs_trans_handle *trans,
3662                               struct btrfs_pending_snapshot *pending);
3663
3664 /* scrub.c */
3665 int btrfs_scrub_dev(struct btrfs_fs_info *fs_info, u64 devid, u64 start,
3666                     u64 end, struct btrfs_scrub_progress *progress,
3667                     int readonly, int is_dev_replace);
3668 void btrfs_scrub_pause(struct btrfs_fs_info *fs_info);
3669 void btrfs_scrub_continue(struct btrfs_fs_info *fs_info);
3670 int btrfs_scrub_cancel(struct btrfs_fs_info *info);
3671 int btrfs_scrub_cancel_dev(struct btrfs_fs_info *info,
3672                            struct btrfs_device *dev);
3673 int btrfs_scrub_progress(struct btrfs_fs_info *fs_info, u64 devid,
3674                          struct btrfs_scrub_progress *progress);
3675 static inline void btrfs_init_full_stripe_locks_tree(
3676                         struct btrfs_full_stripe_locks_tree *locks_root)
3677 {
3678         locks_root->root = RB_ROOT;
3679         mutex_init(&locks_root->lock);
3680 }
3681
3682 /* dev-replace.c */
3683 void btrfs_bio_counter_inc_blocked(struct btrfs_fs_info *fs_info);
3684 void btrfs_bio_counter_inc_noblocked(struct btrfs_fs_info *fs_info);
3685 void btrfs_bio_counter_sub(struct btrfs_fs_info *fs_info, s64 amount);
3686
3687 static inline void btrfs_bio_counter_dec(struct btrfs_fs_info *fs_info)
3688 {
3689         btrfs_bio_counter_sub(fs_info, 1);
3690 }
3691
3692 /* reada.c */
3693 struct reada_control {
3694         struct btrfs_fs_info    *fs_info;               /* tree to prefetch */
3695         struct btrfs_key        key_start;
3696         struct btrfs_key        key_end;        /* exclusive */
3697         atomic_t                elems;
3698         struct kref             refcnt;
3699         wait_queue_head_t       wait;
3700 };
3701 struct reada_control *btrfs_reada_add(struct btrfs_root *root,
3702                               struct btrfs_key *start, struct btrfs_key *end);
3703 int btrfs_reada_wait(void *handle);
3704 void btrfs_reada_detach(void *handle);
3705 int btree_readahead_hook(struct extent_buffer *eb, int err);
3706
3707 static inline int is_fstree(u64 rootid)
3708 {
3709         if (rootid == BTRFS_FS_TREE_OBJECTID ||
3710             ((s64)rootid >= (s64)BTRFS_FIRST_FREE_OBJECTID &&
3711               !btrfs_qgroup_level(rootid)))
3712                 return 1;
3713         return 0;
3714 }
3715
3716 static inline int btrfs_defrag_cancelled(struct btrfs_fs_info *fs_info)
3717 {
3718         return signal_pending(current);
3719 }
3720
3721 /* Sanity test specific functions */
3722 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
3723 void btrfs_test_destroy_inode(struct inode *inode);
3724 #endif
3725
3726 static inline int btrfs_is_testing(struct btrfs_fs_info *fs_info)
3727 {
3728 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
3729         if (unlikely(test_bit(BTRFS_FS_STATE_DUMMY_FS_INFO,
3730                               &fs_info->fs_state)))
3731                 return 1;
3732 #endif
3733         return 0;
3734 }
3735
3736 static inline void cond_wake_up(struct wait_queue_head *wq)
3737 {
3738         /*
3739          * This implies a full smp_mb barrier, see comments for
3740          * waitqueue_active why.
3741          */
3742         if (wq_has_sleeper(wq))
3743                 wake_up(wq);
3744 }
3745
3746 static inline void cond_wake_up_nomb(struct wait_queue_head *wq)
3747 {
3748         /*
3749          * Special case for conditional wakeup where the barrier required for
3750          * waitqueue_active is implied by some of the preceding code. Eg. one
3751          * of such atomic operations (atomic_dec_and_return, ...), or a
3752          * unlock/lock sequence, etc.
3753          */
3754         if (waitqueue_active(wq))
3755                 wake_up(wq);
3756 }
3757
3758 #endif