fs/btrfs/ctree.h

/* [<][>][^][v][top][bottom][index][help] */
This source file includes following definitions.
count_max_extents
btrfs_chunk_item_size
btrfs_sb
btrfs_inode_sectorsize
BTRFS_LEAF_DATA_SIZE
BTRFS_MAX_ITEM_SIZE
BTRFS_NODEPTRS_PER_BLOCK
BTRFS_MAX_INLINE_DATA_SIZE
BTRFS_MAX_XATTR_SIZE
btrfs_init_map_token
btrfs_device_total_bytes
btrfs_set_device_total_bytes
btrfs_device_uuid
btrfs_device_fsid
btrfs_stripe_dev_uuid
btrfs_stripe_nr
btrfs_stripe_dev_uuid_nr
btrfs_stripe_offset_nr
btrfs_stripe_devid_nr
btrfs_dev_extent_chunk_tree_uuid
btrfs_tree_block_key
btrfs_set_tree_block_key
btrfs_extent_inline_ref_size
btrfs_node_blockptr
btrfs_set_node_blockptr
btrfs_node_ptr_generation
btrfs_set_node_ptr_generation
btrfs_node_key_ptr_offset
btrfs_set_node_key
btrfs_item_nr_offset
btrfs_item_nr
btrfs_item_end
btrfs_item_end_nr
btrfs_item_offset_nr
btrfs_item_size_nr
btrfs_item_key
btrfs_set_item_key
btrfs_dir_item_key
btrfs_set_dir_item_key
btrfs_free_space_key
btrfs_set_free_space_key
btrfs_disk_key_to_cpu
btrfs_cpu_key_to_disk
btrfs_node_key_to_cpu
btrfs_item_key_to_cpu
btrfs_dir_item_key_to_cpu
btrfs_header_flag
btrfs_set_header_flag
btrfs_clear_header_flag
btrfs_header_backref_rev
btrfs_set_header_backref_rev
btrfs_header_fsid
btrfs_header_chunk_tree_uuid
btrfs_is_leaf
btrfs_root_readonly
btrfs_root_dead
btrfs_balance_data
btrfs_set_balance_data
btrfs_balance_meta
btrfs_set_balance_meta
btrfs_balance_sys
btrfs_set_balance_sys
btrfs_disk_balance_args_to_cpu
btrfs_cpu_balance_args_to_disk
leaf_data_end
btrfs_file_extent_inline_start
btrfs_file_extent_calc_inline_size
btrfs_file_extent_inline_item_len
btrfs_crc32c
btrfs_crc32c_final
btrfs_name_hash
btrfs_extref_hash
btrfs_alloc_write_mask
btrfs_calc_insert_metadata_size
btrfs_calc_metadata_size
btrfs_del_item
btrfs_insert_empty_item
btrfs_next_old_item
btrfs_next_item
btrfs_fs_closing
btrfs_need_cleaner_sleep
free_fs_info
__printf
assertfail
assertfail
btrfs_print_v0_err
__btrfs_set_fs_incompat
__btrfs_clear_fs_incompat
__btrfs_fs_incompat
__btrfs_set_fs_compat_ro
__btrfs_clear_fs_compat_ro
__btrfs_fs_compat_ro
btrfs_init_acl
btrfs_init_full_stripe_locks_tree
btrfs_bio_counter_dec
is_fstree
btrfs_defrag_cancelled
btrfs_is_testing
btrfs_is_testing
   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 <trace/events/btrfs.h>
  20 #include <asm/kmap_types.h>
  21 #include <asm/unaligned.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 #include "block-rsv.h"
  35 
  36 struct btrfs_trans_handle;
  37 struct btrfs_transaction;
  38 struct btrfs_pending_snapshot;
  39 struct btrfs_delayed_ref_root;
  40 struct btrfs_space_info;
  41 struct btrfs_block_group_cache;
  42 extern struct kmem_cache *btrfs_trans_handle_cachep;
  43 extern struct kmem_cache *btrfs_bit_radix_cachep;
  44 extern struct kmem_cache *btrfs_path_cachep;
  45 extern struct kmem_cache *btrfs_free_space_cachep;
  46 extern struct kmem_cache *btrfs_free_space_bitmap_cachep;
  47 struct btrfs_ordered_sum;
  48 struct btrfs_ref;
  49 
  50 #define BTRFS_MAGIC 0x4D5F53665248425FULL /* ascii _BHRfS_M, no null */
  51 
  52 /*
  53  * Maximum number of mirrors that can be available for all profiles counting
  54  * the target device of dev-replace as one. During an active device replace
  55  * procedure, the target device of the copy operation is a mirror for the
  56  * filesystem data as well that can be used to read data in order to repair
  57  * read errors on other disks.
  58  *
  59  * Current value is derived from RAID1 with 2 copies.
  60  */
  61 #define BTRFS_MAX_MIRRORS (2 + 1)
  62 
  63 #define BTRFS_MAX_LEVEL 8
  64 
  65 #define BTRFS_OLDEST_GENERATION 0ULL
  66 
  67 /*
  68  * the max metadata block size.  This limit is somewhat artificial,
  69  * but the memmove costs go through the roof for larger blocks.
  70  */
  71 #define BTRFS_MAX_METADATA_BLOCKSIZE 65536
  72 
  73 /*
  74  * we can actually store much bigger names, but lets not confuse the rest
  75  * of linux
  76  */
  77 #define BTRFS_NAME_LEN 255
  78 
  79 /*
  80  * Theoretical limit is larger, but we keep this down to a sane
  81  * value. That should limit greatly the possibility of collisions on
  82  * inode ref items.
  83  */
  84 #define BTRFS_LINK_MAX 65535U
  85 
  86 #define BTRFS_EMPTY_DIR_SIZE 0
  87 
  88 /* ioprio of readahead is set to idle */
  89 #define BTRFS_IOPRIO_READA (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_IDLE, 0))
  90 
  91 #define BTRFS_DIRTY_METADATA_THRESH     SZ_32M
  92 
  93 /*
  94  * Use large batch size to reduce overhead of metadata updates.  On the reader
  95  * side, we only read it when we are close to ENOSPC and the read overhead is
  96  * mostly related to the number of CPUs, so it is OK to use arbitrary large
  97  * value here.
  98  */
  99 #define BTRFS_TOTAL_BYTES_PINNED_BATCH  SZ_128M
 100 
 101 #define BTRFS_MAX_EXTENT_SIZE SZ_128M
 102 
 103 
 104 /*
 105  * Count how many BTRFS_MAX_EXTENT_SIZE cover the @size
 106  */
 107 static inline u32 count_max_extents(u64 size)
 108 {
 109         return div_u64(size + BTRFS_MAX_EXTENT_SIZE - 1, BTRFS_MAX_EXTENT_SIZE);
 110 }
 111 
 112 static inline unsigned long btrfs_chunk_item_size(int num_stripes)
 113 {
 114         BUG_ON(num_stripes == 0);
 115         return sizeof(struct btrfs_chunk) +
 116                 sizeof(struct btrfs_stripe) * (num_stripes - 1);
 117 }
 118 
 119 /*
 120  * Runtime (in-memory) states of filesystem
 121  */
 122 enum {
 123         /* Global indicator of serious filesystem errors */
 124         BTRFS_FS_STATE_ERROR,
 125         /*
 126          * Filesystem is being remounted, allow to skip some operations, like
 127          * defrag
 128          */
 129         BTRFS_FS_STATE_REMOUNTING,
 130         /* Track if a transaction abort has been reported on this filesystem */
 131         BTRFS_FS_STATE_TRANS_ABORTED,
 132         /*
 133          * Bio operations should be blocked on this filesystem because a source
 134          * or target device is being destroyed as part of a device replace
 135          */
 136         BTRFS_FS_STATE_DEV_REPLACING,
 137         /* The btrfs_fs_info created for self-tests */
 138         BTRFS_FS_STATE_DUMMY_FS_INFO,
 139 };
 140 
 141 #define BTRFS_BACKREF_REV_MAX           256
 142 #define BTRFS_BACKREF_REV_SHIFT         56
 143 #define BTRFS_BACKREF_REV_MASK          (((u64)BTRFS_BACKREF_REV_MAX - 1) << \
 144                                          BTRFS_BACKREF_REV_SHIFT)
 145 
 146 #define BTRFS_OLD_BACKREF_REV           0
 147 #define BTRFS_MIXED_BACKREF_REV         1
 148 
 149 /*
 150  * every tree block (leaf or node) starts with this header.
 151  */
 152 struct btrfs_header {
 153         /* these first four must match the super block */
 154         u8 csum[BTRFS_CSUM_SIZE];
 155         u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
 156         __le64 bytenr; /* which block this node is supposed to live in */
 157         __le64 flags;
 158 
 159         /* allowed to be different from the super from here on down */
 160         u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
 161         __le64 generation;
 162         __le64 owner;
 163         __le32 nritems;
 164         u8 level;
 165 } __attribute__ ((__packed__));
 166 
 167 /*
 168  * this is a very generous portion of the super block, giving us
 169  * room to translate 14 chunks with 3 stripes each.
 170  */
 171 #define BTRFS_SYSTEM_CHUNK_ARRAY_SIZE 2048
 172 
 173 /*
 174  * just in case we somehow lose the roots and are not able to mount,
 175  * we store an array of the roots from previous transactions
 176  * in the super.
 177  */
 178 #define BTRFS_NUM_BACKUP_ROOTS 4
 179 struct btrfs_root_backup {
 180         __le64 tree_root;
 181         __le64 tree_root_gen;
 182 
 183         __le64 chunk_root;
 184         __le64 chunk_root_gen;
 185 
 186         __le64 extent_root;
 187         __le64 extent_root_gen;
 188 
 189         __le64 fs_root;
 190         __le64 fs_root_gen;
 191 
 192         __le64 dev_root;
 193         __le64 dev_root_gen;
 194 
 195         __le64 csum_root;
 196         __le64 csum_root_gen;
 197 
 198         __le64 total_bytes;
 199         __le64 bytes_used;
 200         __le64 num_devices;
 201         /* future */
 202         __le64 unused_64[4];
 203 
 204         u8 tree_root_level;
 205         u8 chunk_root_level;
 206         u8 extent_root_level;
 207         u8 fs_root_level;
 208         u8 dev_root_level;
 209         u8 csum_root_level;
 210         /* future and to align */
 211         u8 unused_8[10];
 212 } __attribute__ ((__packed__));
 213 
 214 /*
 215  * the super block basically lists the main trees of the FS
 216  * it currently lacks any block count etc etc
 217  */
 218 struct btrfs_super_block {
 219         /* the first 4 fields must match struct btrfs_header */
 220         u8 csum[BTRFS_CSUM_SIZE];
 221         /* FS specific UUID, visible to user */
 222         u8 fsid[BTRFS_FSID_SIZE];
 223         __le64 bytenr; /* this block number */
 224         __le64 flags;
 225 
 226         /* allowed to be different from the btrfs_header from here own down */
 227         __le64 magic;
 228         __le64 generation;
 229         __le64 root;
 230         __le64 chunk_root;
 231         __le64 log_root;
 232 
 233         /* this will help find the new super based on the log root */
 234         __le64 log_root_transid;
 235         __le64 total_bytes;
 236         __le64 bytes_used;
 237         __le64 root_dir_objectid;
 238         __le64 num_devices;
 239         __le32 sectorsize;
 240         __le32 nodesize;
 241         __le32 __unused_leafsize;
 242         __le32 stripesize;
 243         __le32 sys_chunk_array_size;
 244         __le64 chunk_root_generation;
 245         __le64 compat_flags;
 246         __le64 compat_ro_flags;
 247         __le64 incompat_flags;
 248         __le16 csum_type;
 249         u8 root_level;
 250         u8 chunk_root_level;
 251         u8 log_root_level;
 252         struct btrfs_dev_item dev_item;
 253 
 254         char label[BTRFS_LABEL_SIZE];
 255 
 256         __le64 cache_generation;
 257         __le64 uuid_tree_generation;
 258 
 259         /* the UUID written into btree blocks */
 260         u8 metadata_uuid[BTRFS_FSID_SIZE];
 261 
 262         /* future expansion */
 263         __le64 reserved[28];
 264         u8 sys_chunk_array[BTRFS_SYSTEM_CHUNK_ARRAY_SIZE];
 265         struct btrfs_root_backup super_roots[BTRFS_NUM_BACKUP_ROOTS];
 266 } __attribute__ ((__packed__));
 267 
 268 /*
 269  * Compat flags that we support.  If any incompat flags are set other than the
 270  * ones specified below then we will fail to mount
 271  */
 272 #define BTRFS_FEATURE_COMPAT_SUPP               0ULL
 273 #define BTRFS_FEATURE_COMPAT_SAFE_SET           0ULL
 274 #define BTRFS_FEATURE_COMPAT_SAFE_CLEAR         0ULL
 275 
 276 #define BTRFS_FEATURE_COMPAT_RO_SUPP                    \
 277         (BTRFS_FEATURE_COMPAT_RO_FREE_SPACE_TREE |      \
 278          BTRFS_FEATURE_COMPAT_RO_FREE_SPACE_TREE_VALID)
 279 
 280 #define BTRFS_FEATURE_COMPAT_RO_SAFE_SET        0ULL
 281 #define BTRFS_FEATURE_COMPAT_RO_SAFE_CLEAR      0ULL
 282 
 283 #define BTRFS_FEATURE_INCOMPAT_SUPP                     \
 284         (BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF |         \
 285          BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL |        \
 286          BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS |          \
 287          BTRFS_FEATURE_INCOMPAT_BIG_METADATA |          \
 288          BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO |          \
 289          BTRFS_FEATURE_INCOMPAT_COMPRESS_ZSTD |         \
 290          BTRFS_FEATURE_INCOMPAT_RAID56 |                \
 291          BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF |         \
 292          BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA |       \
 293          BTRFS_FEATURE_INCOMPAT_NO_HOLES        |       \
 294          BTRFS_FEATURE_INCOMPAT_METADATA_UUID)
 295 
 296 #define BTRFS_FEATURE_INCOMPAT_SAFE_SET                 \
 297         (BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF)
 298 #define BTRFS_FEATURE_INCOMPAT_SAFE_CLEAR               0ULL
 299 
 300 /*
 301  * A leaf is full of items. offset and size tell us where to find
 302  * the item in the leaf (relative to the start of the data area)
 303  */
 304 struct btrfs_item {
 305         struct btrfs_disk_key key;
 306         __le32 offset;
 307         __le32 size;
 308 } __attribute__ ((__packed__));
 309 
 310 /*
 311  * leaves have an item area and a data area:
 312  * [item0, item1....itemN] [free space] [dataN...data1, data0]
 313  *
 314  * The data is separate from the items to get the keys closer together
 315  * during searches.
 316  */
 317 struct btrfs_leaf {
 318         struct btrfs_header header;
 319         struct btrfs_item items[];
 320 } __attribute__ ((__packed__));
 321 
 322 /*
 323  * all non-leaf blocks are nodes, they hold only keys and pointers to
 324  * other blocks
 325  */
 326 struct btrfs_key_ptr {
 327         struct btrfs_disk_key key;
 328         __le64 blockptr;
 329         __le64 generation;
 330 } __attribute__ ((__packed__));
 331 
 332 struct btrfs_node {
 333         struct btrfs_header header;
 334         struct btrfs_key_ptr ptrs[];
 335 } __attribute__ ((__packed__));
 336 
 337 /*
 338  * btrfs_paths remember the path taken from the root down to the leaf.
 339  * level 0 is always the leaf, and nodes[1...BTRFS_MAX_LEVEL] will point
 340  * to any other levels that are present.
 341  *
 342  * The slots array records the index of the item or block pointer
 343  * used while walking the tree.
 344  */
 345 enum { READA_NONE, READA_BACK, READA_FORWARD };
 346 struct btrfs_path {
 347         struct extent_buffer *nodes[BTRFS_MAX_LEVEL];
 348         int slots[BTRFS_MAX_LEVEL];
 349         /* if there is real range locking, this locks field will change */
 350         u8 locks[BTRFS_MAX_LEVEL];
 351         u8 reada;
 352         /* keep some upper locks as we walk down */
 353         u8 lowest_level;
 354 
 355         /*
 356          * set by btrfs_split_item, tells search_slot to keep all locks
 357          * and to force calls to keep space in the nodes
 358          */
 359         unsigned int search_for_split:1;
 360         unsigned int keep_locks:1;
 361         unsigned int skip_locking:1;
 362         unsigned int leave_spinning:1;
 363         unsigned int search_commit_root:1;
 364         unsigned int need_commit_sem:1;
 365         unsigned int skip_release_on_error:1;
 366 };
 367 #define BTRFS_MAX_EXTENT_ITEM_SIZE(r) ((BTRFS_LEAF_DATA_SIZE(r->fs_info) >> 4) - \
 368                                         sizeof(struct btrfs_item))
 369 struct btrfs_dev_replace {
 370         u64 replace_state;      /* see #define above */
 371         time64_t time_started;  /* seconds since 1-Jan-1970 */
 372         time64_t time_stopped;  /* seconds since 1-Jan-1970 */
 373         atomic64_t num_write_errors;
 374         atomic64_t num_uncorrectable_read_errors;
 375 
 376         u64 cursor_left;
 377         u64 committed_cursor_left;
 378         u64 cursor_left_last_write_of_item;
 379         u64 cursor_right;
 380 
 381         u64 cont_reading_from_srcdev_mode;      /* see #define above */
 382 
 383         int is_valid;
 384         int item_needs_writeback;
 385         struct btrfs_device *srcdev;
 386         struct btrfs_device *tgtdev;
 387 
 388         struct mutex lock_finishing_cancel_unmount;
 389         struct rw_semaphore rwsem;
 390 
 391         struct btrfs_scrub_progress scrub_progress;
 392 
 393         struct percpu_counter bio_counter;
 394         wait_queue_head_t replace_wait;
 395 };
 396 
 397 /*
 398  * free clusters are used to claim free space in relatively large chunks,
 399  * allowing us to do less seeky writes. They are used for all metadata
 400  * allocations. In ssd_spread mode they are also used for data allocations.
 401  */
 402 struct btrfs_free_cluster {
 403         spinlock_t lock;
 404         spinlock_t refill_lock;
 405         struct rb_root root;
 406 
 407         /* largest extent in this cluster */
 408         u64 max_size;
 409 
 410         /* first extent starting offset */
 411         u64 window_start;
 412 
 413         /* We did a full search and couldn't create a cluster */
 414         bool fragmented;
 415 
 416         struct btrfs_block_group_cache *block_group;
 417         /*
 418          * when a cluster is allocated from a block group, we put the
 419          * cluster onto a list in the block group so that it can
 420          * be freed before the block group is freed.
 421          */
 422         struct list_head block_group_list;
 423 };
 424 
 425 enum btrfs_caching_type {
 426         BTRFS_CACHE_NO,
 427         BTRFS_CACHE_STARTED,
 428         BTRFS_CACHE_FAST,
 429         BTRFS_CACHE_FINISHED,
 430         BTRFS_CACHE_ERROR,
 431 };
 432 
 433 /*
 434  * Tree to record all locked full stripes of a RAID5/6 block group
 435  */
 436 struct btrfs_full_stripe_locks_tree {
 437         struct rb_root root;
 438         struct mutex lock;
 439 };
 440 
 441 /* delayed seq elem */
 442 struct seq_list {
 443         struct list_head list;
 444         u64 seq;
 445 };
 446 
 447 #define SEQ_LIST_INIT(name)     { .list = LIST_HEAD_INIT((name).list), .seq = 0 }
 448 
 449 #define SEQ_LAST        ((u64)-1)
 450 
 451 enum btrfs_orphan_cleanup_state {
 452         ORPHAN_CLEANUP_STARTED  = 1,
 453         ORPHAN_CLEANUP_DONE     = 2,
 454 };
 455 
 456 void btrfs_init_async_reclaim_work(struct work_struct *work);
 457 
 458 /* fs_info */
 459 struct reloc_control;
 460 struct btrfs_device;
 461 struct btrfs_fs_devices;
 462 struct btrfs_balance_control;
 463 struct btrfs_delayed_root;
 464 
 465 /*
 466  * Block group or device which contains an active swapfile. Used for preventing
 467  * unsafe operations while a swapfile is active.
 468  *
 469  * These are sorted on (ptr, inode) (note that a block group or device can
 470  * contain more than one swapfile). We compare the pointer values because we
 471  * don't actually care what the object is, we just need a quick check whether
 472  * the object exists in the rbtree.
 473  */
 474 struct btrfs_swapfile_pin {
 475         struct rb_node node;
 476         void *ptr;
 477         struct inode *inode;
 478         /*
 479          * If true, ptr points to a struct btrfs_block_group_cache. Otherwise,
 480          * ptr points to a struct btrfs_device.
 481          */
 482         bool is_block_group;
 483 };
 484 
 485 bool btrfs_pinned_by_swapfile(struct btrfs_fs_info *fs_info, void *ptr);
 486 
 487 enum {
 488         BTRFS_FS_BARRIER,
 489         BTRFS_FS_CLOSING_START,
 490         BTRFS_FS_CLOSING_DONE,
 491         BTRFS_FS_LOG_RECOVERING,
 492         BTRFS_FS_OPEN,
 493         BTRFS_FS_QUOTA_ENABLED,
 494         BTRFS_FS_UPDATE_UUID_TREE_GEN,
 495         BTRFS_FS_CREATING_FREE_SPACE_TREE,
 496         BTRFS_FS_BTREE_ERR,
 497         BTRFS_FS_LOG1_ERR,
 498         BTRFS_FS_LOG2_ERR,
 499         BTRFS_FS_QUOTA_OVERRIDE,
 500         /* Used to record internally whether fs has been frozen */
 501         BTRFS_FS_FROZEN,
 502         /*
 503          * Indicate that a whole-filesystem exclusive operation is running
 504          * (device replace, resize, device add/delete, balance)
 505          */
 506         BTRFS_FS_EXCL_OP,
 507         /*
 508          * To info transaction_kthread we need an immediate commit so it
 509          * doesn't need to wait for commit_interval
 510          */
 511         BTRFS_FS_NEED_ASYNC_COMMIT,
 512         /*
 513          * Indicate that balance has been set up from the ioctl and is in the
 514          * main phase. The fs_info::balance_ctl is initialized.
 515          * Set and cleared while holding fs_info::balance_mutex.
 516          */
 517         BTRFS_FS_BALANCE_RUNNING,
 518 
 519         /* Indicate that the cleaner thread is awake and doing something. */
 520         BTRFS_FS_CLEANER_RUNNING,
 521 
 522         /*
 523          * The checksumming has an optimized version and is considered fast,
 524          * so we don't need to offload checksums to workqueues.
 525          */
 526         BTRFS_FS_CSUM_IMPL_FAST,
 527 };
 528 
 529 struct btrfs_fs_info {
 530         u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
 531         unsigned long flags;
 532         struct btrfs_root *extent_root;
 533         struct btrfs_root *tree_root;
 534         struct btrfs_root *chunk_root;
 535         struct btrfs_root *dev_root;
 536         struct btrfs_root *fs_root;
 537         struct btrfs_root *csum_root;
 538         struct btrfs_root *quota_root;
 539         struct btrfs_root *uuid_root;
 540         struct btrfs_root *free_space_root;
 541 
 542         /* the log root tree is a directory of all the other log roots */
 543         struct btrfs_root *log_root_tree;
 544 
 545         spinlock_t fs_roots_radix_lock;
 546         struct radix_tree_root fs_roots_radix;
 547 
 548         /* block group cache stuff */
 549         spinlock_t block_group_cache_lock;
 550         u64 first_logical_byte;
 551         struct rb_root block_group_cache_tree;
 552 
 553         /* keep track of unallocated space */
 554         atomic64_t free_chunk_space;
 555 
 556         struct extent_io_tree freed_extents[2];
 557         struct extent_io_tree *pinned_extents;
 558 
 559         /* logical->physical extent mapping */
 560         struct extent_map_tree mapping_tree;
 561 
 562         /*
 563          * block reservation for extent, checksum, root tree and
 564          * delayed dir index item
 565          */
 566         struct btrfs_block_rsv global_block_rsv;
 567         /* block reservation for metadata operations */
 568         struct btrfs_block_rsv trans_block_rsv;
 569         /* block reservation for chunk tree */
 570         struct btrfs_block_rsv chunk_block_rsv;
 571         /* block reservation for delayed operations */
 572         struct btrfs_block_rsv delayed_block_rsv;
 573         /* block reservation for delayed refs */
 574         struct btrfs_block_rsv delayed_refs_rsv;
 575 
 576         struct btrfs_block_rsv empty_block_rsv;
 577 
 578         u64 generation;
 579         u64 last_trans_committed;
 580         u64 avg_delayed_ref_runtime;
 581 
 582         /*
 583          * this is updated to the current trans every time a full commit
 584          * is required instead of the faster short fsync log commits
 585          */
 586         u64 last_trans_log_full_commit;
 587         unsigned long mount_opt;
 588         /*
 589          * Track requests for actions that need to be done during transaction
 590          * commit (like for some mount options).
 591          */
 592         unsigned long pending_changes;
 593         unsigned long compress_type:4;
 594         unsigned int compress_level;
 595         u32 commit_interval;
 596         /*
 597          * It is a suggestive number, the read side is safe even it gets a
 598          * wrong number because we will write out the data into a regular
 599          * extent. The write side(mount/remount) is under ->s_umount lock,
 600          * so it is also safe.
 601          */
 602         u64 max_inline;
 603 
 604         struct btrfs_transaction *running_transaction;
 605         wait_queue_head_t transaction_throttle;
 606         wait_queue_head_t transaction_wait;
 607         wait_queue_head_t transaction_blocked_wait;
 608         wait_queue_head_t async_submit_wait;
 609 
 610         /*
 611          * Used to protect the incompat_flags, compat_flags, compat_ro_flags
 612          * when they are updated.
 613          *
 614          * Because we do not clear the flags for ever, so we needn't use
 615          * the lock on the read side.
 616          *
 617          * We also needn't use the lock when we mount the fs, because
 618          * there is no other task which will update the flag.
 619          */
 620         spinlock_t super_lock;
 621         struct btrfs_super_block *super_copy;
 622         struct btrfs_super_block *super_for_commit;
 623         struct super_block *sb;
 624         struct inode *btree_inode;
 625         struct mutex tree_log_mutex;
 626         struct mutex transaction_kthread_mutex;
 627         struct mutex cleaner_mutex;
 628         struct mutex chunk_mutex;
 629 
 630         /*
 631          * this is taken to make sure we don't set block groups ro after
 632          * the free space cache has been allocated on them
 633          */
 634         struct mutex ro_block_group_mutex;
 635 
 636         /* this is used during read/modify/write to make sure
 637          * no two ios are trying to mod the same stripe at the same
 638          * time
 639          */
 640         struct btrfs_stripe_hash_table *stripe_hash_table;
 641 
 642         /*
 643          * this protects the ordered operations list only while we are
 644          * processing all of the entries on it.  This way we make
 645          * sure the commit code doesn't find the list temporarily empty
 646          * because another function happens to be doing non-waiting preflush
 647          * before jumping into the main commit.
 648          */
 649         struct mutex ordered_operations_mutex;
 650 
 651         struct rw_semaphore commit_root_sem;
 652 
 653         struct rw_semaphore cleanup_work_sem;
 654 
 655         struct rw_semaphore subvol_sem;
 656         struct srcu_struct subvol_srcu;
 657 
 658         spinlock_t trans_lock;
 659         /*
 660          * the reloc mutex goes with the trans lock, it is taken
 661          * during commit to protect us from the relocation code
 662          */
 663         struct mutex reloc_mutex;
 664 
 665         struct list_head trans_list;
 666         struct list_head dead_roots;
 667         struct list_head caching_block_groups;
 668 
 669         spinlock_t delayed_iput_lock;
 670         struct list_head delayed_iputs;
 671         atomic_t nr_delayed_iputs;
 672         wait_queue_head_t delayed_iputs_wait;
 673 
 674         atomic64_t tree_mod_seq;
 675 
 676         /* this protects tree_mod_log and tree_mod_seq_list */
 677         rwlock_t tree_mod_log_lock;
 678         struct rb_root tree_mod_log;
 679         struct list_head tree_mod_seq_list;
 680 
 681         atomic_t async_delalloc_pages;
 682 
 683         /*
 684          * this is used to protect the following list -- ordered_roots.
 685          */
 686         spinlock_t ordered_root_lock;
 687 
 688         /*
 689          * all fs/file tree roots in which there are data=ordered extents
 690          * pending writeback are added into this list.
 691          *
 692          * these can span multiple transactions and basically include
 693          * every dirty data page that isn't from nodatacow
 694          */
 695         struct list_head ordered_roots;
 696 
 697         struct mutex delalloc_root_mutex;
 698         spinlock_t delalloc_root_lock;
 699         /* all fs/file tree roots that have delalloc inodes. */
 700         struct list_head delalloc_roots;
 701 
 702         /*
 703          * there is a pool of worker threads for checksumming during writes
 704          * and a pool for checksumming after reads.  This is because readers
 705          * can run with FS locks held, and the writers may be waiting for
 706          * those locks.  We don't want ordering in the pending list to cause
 707          * deadlocks, and so the two are serviced separately.
 708          *
 709          * A third pool does submit_bio to avoid deadlocking with the other
 710          * two
 711          */
 712         struct btrfs_workqueue *workers;
 713         struct btrfs_workqueue *delalloc_workers;
 714         struct btrfs_workqueue *flush_workers;
 715         struct btrfs_workqueue *endio_workers;
 716         struct btrfs_workqueue *endio_meta_workers;
 717         struct btrfs_workqueue *endio_raid56_workers;
 718         struct btrfs_workqueue *endio_repair_workers;
 719         struct btrfs_workqueue *rmw_workers;
 720         struct btrfs_workqueue *endio_meta_write_workers;
 721         struct btrfs_workqueue *endio_write_workers;
 722         struct btrfs_workqueue *endio_freespace_worker;
 723         struct btrfs_workqueue *submit_workers;
 724         struct btrfs_workqueue *caching_workers;
 725         struct btrfs_workqueue *readahead_workers;
 726 
 727         /*
 728          * fixup workers take dirty pages that didn't properly go through
 729          * the cow mechanism and make them safe to write.  It happens
 730          * for the sys_munmap function call path
 731          */
 732         struct btrfs_workqueue *fixup_workers;
 733         struct btrfs_workqueue *delayed_workers;
 734 
 735         struct task_struct *transaction_kthread;
 736         struct task_struct *cleaner_kthread;
 737         u32 thread_pool_size;
 738 
 739         struct kobject *space_info_kobj;
 740 
 741         u64 total_pinned;
 742 
 743         /* used to keep from writing metadata until there is a nice batch */
 744         struct percpu_counter dirty_metadata_bytes;
 745         struct percpu_counter delalloc_bytes;
 746         struct percpu_counter dio_bytes;
 747         s32 dirty_metadata_batch;
 748         s32 delalloc_batch;
 749 
 750         struct list_head dirty_cowonly_roots;
 751 
 752         struct btrfs_fs_devices *fs_devices;
 753 
 754         /*
 755          * The space_info list is effectively read only after initial
 756          * setup.  It is populated at mount time and cleaned up after
 757          * all block groups are removed.  RCU is used to protect it.
 758          */
 759         struct list_head space_info;
 760 
 761         struct btrfs_space_info *data_sinfo;
 762 
 763         struct reloc_control *reloc_ctl;
 764 
 765         /* data_alloc_cluster is only used in ssd_spread mode */
 766         struct btrfs_free_cluster data_alloc_cluster;
 767 
 768         /* all metadata allocations go through this cluster */
 769         struct btrfs_free_cluster meta_alloc_cluster;
 770 
 771         /* auto defrag inodes go here */
 772         spinlock_t defrag_inodes_lock;
 773         struct rb_root defrag_inodes;
 774         atomic_t defrag_running;
 775 
 776         /* Used to protect avail_{data, metadata, system}_alloc_bits */
 777         seqlock_t profiles_lock;
 778         /*
 779          * these three are in extended format (availability of single
 780          * chunks is denoted by BTRFS_AVAIL_ALLOC_BIT_SINGLE bit, other
 781          * types are denoted by corresponding BTRFS_BLOCK_GROUP_* bits)
 782          */
 783         u64 avail_data_alloc_bits;
 784         u64 avail_metadata_alloc_bits;
 785         u64 avail_system_alloc_bits;
 786 
 787         /* restriper state */
 788         spinlock_t balance_lock;
 789         struct mutex balance_mutex;
 790         atomic_t balance_pause_req;
 791         atomic_t balance_cancel_req;
 792         struct btrfs_balance_control *balance_ctl;
 793         wait_queue_head_t balance_wait_q;
 794 
 795         u32 data_chunk_allocations;
 796         u32 metadata_ratio;
 797 
 798         void *bdev_holder;
 799 
 800         /* private scrub information */
 801         struct mutex scrub_lock;
 802         atomic_t scrubs_running;
 803         atomic_t scrub_pause_req;
 804         atomic_t scrubs_paused;
 805         atomic_t scrub_cancel_req;
 806         wait_queue_head_t scrub_pause_wait;
 807         /*
 808          * The worker pointers are NULL iff the refcount is 0, ie. scrub is not
 809          * running.
 810          */
 811         refcount_t scrub_workers_refcnt;
 812         struct btrfs_workqueue *scrub_workers;
 813         struct btrfs_workqueue *scrub_wr_completion_workers;
 814         struct btrfs_workqueue *scrub_parity_workers;
 815 
 816 #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY
 817         u32 check_integrity_print_mask;
 818 #endif
 819         /* is qgroup tracking in a consistent state? */
 820         u64 qgroup_flags;
 821 
 822         /* holds configuration and tracking. Protected by qgroup_lock */
 823         struct rb_root qgroup_tree;
 824         spinlock_t qgroup_lock;
 825 
 826         /*
 827          * used to avoid frequently calling ulist_alloc()/ulist_free()
 828          * when doing qgroup accounting, it must be protected by qgroup_lock.
 829          */
 830         struct ulist *qgroup_ulist;
 831 
 832         /* protect user change for quota operations */
 833         struct mutex qgroup_ioctl_lock;
 834 
 835         /* list of dirty qgroups to be written at next commit */
 836         struct list_head dirty_qgroups;
 837 
 838         /* used by qgroup for an efficient tree traversal */
 839         u64 qgroup_seq;
 840 
 841         /* qgroup rescan items */
 842         struct mutex qgroup_rescan_lock; /* protects the progress item */
 843         struct btrfs_key qgroup_rescan_progress;
 844         struct btrfs_workqueue *qgroup_rescan_workers;
 845         struct completion qgroup_rescan_completion;
 846         struct btrfs_work qgroup_rescan_work;
 847         bool qgroup_rescan_running;     /* protected by qgroup_rescan_lock */
 848 
 849         /* filesystem state */
 850         unsigned long fs_state;
 851 
 852         struct btrfs_delayed_root *delayed_root;
 853 
 854         /* readahead tree */
 855         spinlock_t reada_lock;
 856         struct radix_tree_root reada_tree;
 857 
 858         /* readahead works cnt */
 859         atomic_t reada_works_cnt;
 860 
 861         /* Extent buffer radix tree */
 862         spinlock_t buffer_lock;
 863         struct radix_tree_root buffer_radix;
 864 
 865         /* next backup root to be overwritten */
 866         int backup_root_index;
 867 
 868         /* device replace state */
 869         struct btrfs_dev_replace dev_replace;
 870 
 871         struct semaphore uuid_tree_rescan_sem;
 872 
 873         /* Used to reclaim the metadata space in the background. */
 874         struct work_struct async_reclaim_work;
 875 
 876         spinlock_t unused_bgs_lock;
 877         struct list_head unused_bgs;
 878         struct mutex unused_bg_unpin_mutex;
 879         struct mutex delete_unused_bgs_mutex;
 880 
 881         /* Cached block sizes */
 882         u32 nodesize;
 883         u32 sectorsize;
 884         u32 stripesize;
 885 
 886         /* Block groups and devices containing active swapfiles. */
 887         spinlock_t swapfile_pins_lock;
 888         struct rb_root swapfile_pins;
 889 
 890         struct crypto_shash *csum_shash;
 891 
 892         /*
 893          * Number of send operations in progress.
 894          * Updated while holding fs_info::balance_mutex.
 895          */
 896         int send_in_progress;
 897 
 898 #ifdef CONFIG_BTRFS_FS_REF_VERIFY
 899         spinlock_t ref_verify_lock;
 900         struct rb_root block_tree;
 901 #endif
 902 };
 903 
 904 static inline struct btrfs_fs_info *btrfs_sb(struct super_block *sb)
 905 {
 906         return sb->s_fs_info;
 907 }
 908 
 909 struct btrfs_subvolume_writers {
 910         struct percpu_counter   counter;
 911         wait_queue_head_t       wait;
 912 };
 913 
 914 /*
 915  * The state of btrfs root
 916  */
 917 enum {
 918         /*
 919          * btrfs_record_root_in_trans is a multi-step process, and it can race
 920          * with the balancing code.   But the race is very small, and only the
 921          * first time the root is added to each transaction.  So IN_TRANS_SETUP
 922          * is used to tell us when more checks are required
 923          */
 924         BTRFS_ROOT_IN_TRANS_SETUP,
 925         BTRFS_ROOT_REF_COWS,
 926         BTRFS_ROOT_TRACK_DIRTY,
 927         BTRFS_ROOT_IN_RADIX,
 928         BTRFS_ROOT_ORPHAN_ITEM_INSERTED,
 929         BTRFS_ROOT_DEFRAG_RUNNING,
 930         BTRFS_ROOT_FORCE_COW,
 931         BTRFS_ROOT_MULTI_LOG_TASKS,
 932         BTRFS_ROOT_DIRTY,
 933         BTRFS_ROOT_DELETING,
 934 
 935         /*
 936          * Reloc tree is orphan, only kept here for qgroup delayed subtree scan
 937          *
 938          * Set for the subvolume tree owning the reloc tree.
 939          */
 940         BTRFS_ROOT_DEAD_RELOC_TREE,
 941         /* Mark dead root stored on device whose cleanup needs to be resumed */
 942         BTRFS_ROOT_DEAD_TREE,
 943 };
 944 
 945 /*
 946  * Record swapped tree blocks of a subvolume tree for delayed subtree trace
 947  * code. For detail check comment in fs/btrfs/qgroup.c.
 948  */
 949 struct btrfs_qgroup_swapped_blocks {
 950         spinlock_t lock;
 951         /* RM_EMPTY_ROOT() of above blocks[] */
 952         bool swapped;
 953         struct rb_root blocks[BTRFS_MAX_LEVEL];
 954 };
 955 
 956 /*
 957  * in ram representation of the tree.  extent_root is used for all allocations
 958  * and for the extent tree extent_root root.
 959  */
 960 struct btrfs_root {
 961         struct extent_buffer *node;
 962 
 963         struct extent_buffer *commit_root;
 964         struct btrfs_root *log_root;
 965         struct btrfs_root *reloc_root;
 966 
 967         unsigned long state;
 968         struct btrfs_root_item root_item;
 969         struct btrfs_key root_key;
 970         struct btrfs_fs_info *fs_info;
 971         struct extent_io_tree dirty_log_pages;
 972 
 973         struct mutex objectid_mutex;
 974 
 975         spinlock_t accounting_lock;
 976         struct btrfs_block_rsv *block_rsv;
 977 
 978         /* free ino cache stuff */
 979         struct btrfs_free_space_ctl *free_ino_ctl;
 980         enum btrfs_caching_type ino_cache_state;
 981         spinlock_t ino_cache_lock;
 982         wait_queue_head_t ino_cache_wait;
 983         struct btrfs_free_space_ctl *free_ino_pinned;
 984         u64 ino_cache_progress;
 985         struct inode *ino_cache_inode;
 986 
 987         struct mutex log_mutex;
 988         wait_queue_head_t log_writer_wait;
 989         wait_queue_head_t log_commit_wait[2];
 990         struct list_head log_ctxs[2];
 991         atomic_t log_writers;
 992         atomic_t log_commit[2];
 993         atomic_t log_batch;
 994         int log_transid;
 995         /* No matter the commit succeeds or not*/
 996         int log_transid_committed;
 997         /* Just be updated when the commit succeeds. */
 998         int last_log_commit;
 999         pid_t log_start_pid;
1000 
1001         u64 last_trans;
1002 
1003         u32 type;
1004 
1005         u64 highest_objectid;
1006 
1007         u64 defrag_trans_start;
1008         struct btrfs_key defrag_progress;
1009         struct btrfs_key defrag_max;
1010 
1011         /* the dirty list is only used by non-reference counted roots */
1012         struct list_head dirty_list;
1013 
1014         struct list_head root_list;
1015 
1016         spinlock_t log_extents_lock[2];
1017         struct list_head logged_list[2];
1018 
1019         int orphan_cleanup_state;
1020 
1021         spinlock_t inode_lock;
1022         /* red-black tree that keeps track of in-memory inodes */
1023         struct rb_root inode_tree;
1024 
1025         /*
1026          * radix tree that keeps track of delayed nodes of every inode,
1027          * protected by inode_lock
1028          */
1029         struct radix_tree_root delayed_nodes_tree;
1030         /*
1031          * right now this just gets used so that a root has its own devid
1032          * for stat.  It may be used for more later
1033          */
1034         dev_t anon_dev;
1035 
1036         spinlock_t root_item_lock;
1037         refcount_t refs;
1038 
1039         struct mutex delalloc_mutex;
1040         spinlock_t delalloc_lock;
1041         /*
1042          * all of the inodes that have delalloc bytes.  It is possible for
1043          * this list to be empty even when there is still dirty data=ordered
1044          * extents waiting to finish IO.
1045          */
1046         struct list_head delalloc_inodes;
1047         struct list_head delalloc_root;
1048         u64 nr_delalloc_inodes;
1049 
1050         struct mutex ordered_extent_mutex;
1051         /*
1052          * this is used by the balancing code to wait for all the pending
1053          * ordered extents
1054          */
1055         spinlock_t ordered_extent_lock;
1056 
1057         /*
1058          * all of the data=ordered extents pending writeback
1059          * these can span multiple transactions and basically include
1060          * every dirty data page that isn't from nodatacow
1061          */
1062         struct list_head ordered_extents;
1063         struct list_head ordered_root;
1064         u64 nr_ordered_extents;
1065 
1066         /*
1067          * Not empty if this subvolume root has gone through tree block swap
1068          * (relocation)
1069          *
1070          * Will be used by reloc_control::dirty_subvol_roots.
1071          */
1072         struct list_head reloc_dirty_list;
1073 
1074         /*
1075          * Number of currently running SEND ioctls to prevent
1076          * manipulation with the read-only status via SUBVOL_SETFLAGS
1077          */
1078         int send_in_progress;
1079         /*
1080          * Number of currently running deduplication operations that have a
1081          * destination inode belonging to this root. Protected by the lock
1082          * root_item_lock.
1083          */
1084         int dedupe_in_progress;
1085         struct btrfs_subvolume_writers *subv_writers;
1086         atomic_t will_be_snapshotted;
1087         atomic_t snapshot_force_cow;
1088 
1089         /* For qgroup metadata reserved space */
1090         spinlock_t qgroup_meta_rsv_lock;
1091         u64 qgroup_meta_rsv_pertrans;
1092         u64 qgroup_meta_rsv_prealloc;
1093 
1094         /* Number of active swapfiles */
1095         atomic_t nr_swapfiles;
1096 
1097         /* Record pairs of swapped blocks for qgroup */
1098         struct btrfs_qgroup_swapped_blocks swapped_blocks;
1099 
1100 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
1101         u64 alloc_bytenr;
1102 #endif
1103 };
1104 
1105 struct btrfs_clone_extent_info {
1106         u64 disk_offset;
1107         u64 disk_len;
1108         u64 data_offset;
1109         u64 data_len;
1110         u64 file_offset;
1111         char *extent_buf;
1112         u32 item_size;
1113 };
1114 
1115 struct btrfs_file_private {
1116         void *filldir_buf;
1117 };
1118 
1119 static inline u32 btrfs_inode_sectorsize(const struct inode *inode)
1120 {
1121         return btrfs_sb(inode->i_sb)->sectorsize;
1122 }
1123 
1124 static inline u32 BTRFS_LEAF_DATA_SIZE(const struct btrfs_fs_info *info)
1125 {
1126 
1127         return info->nodesize - sizeof(struct btrfs_header);
1128 }
1129 
1130 #define BTRFS_LEAF_DATA_OFFSET          offsetof(struct btrfs_leaf, items)
1131 
1132 static inline u32 BTRFS_MAX_ITEM_SIZE(const struct btrfs_fs_info *info)
1133 {
1134         return BTRFS_LEAF_DATA_SIZE(info) - sizeof(struct btrfs_item);
1135 }
1136 
1137 static inline u32 BTRFS_NODEPTRS_PER_BLOCK(const struct btrfs_fs_info *info)
1138 {
1139         return BTRFS_LEAF_DATA_SIZE(info) / sizeof(struct btrfs_key_ptr);
1140 }
1141 
1142 #define BTRFS_FILE_EXTENT_INLINE_DATA_START             \
1143                 (offsetof(struct btrfs_file_extent_item, disk_bytenr))
1144 static inline u32 BTRFS_MAX_INLINE_DATA_SIZE(const struct btrfs_fs_info *info)
1145 {
1146         return BTRFS_MAX_ITEM_SIZE(info) -
1147                BTRFS_FILE_EXTENT_INLINE_DATA_START;
1148 }
1149 
1150 static inline u32 BTRFS_MAX_XATTR_SIZE(const struct btrfs_fs_info *info)
1151 {
1152         return BTRFS_MAX_ITEM_SIZE(info) - sizeof(struct btrfs_dir_item);
1153 }
1154 
1155 /*
1156  * Flags for mount options.
1157  *
1158  * Note: don't forget to add new options to btrfs_show_options()
1159  */
1160 #define BTRFS_MOUNT_NODATASUM           (1 << 0)
1161 #define BTRFS_MOUNT_NODATACOW           (1 << 1)
1162 #define BTRFS_MOUNT_NOBARRIER           (1 << 2)
1163 #define BTRFS_MOUNT_SSD                 (1 << 3)
1164 #define BTRFS_MOUNT_DEGRADED            (1 << 4)
1165 #define BTRFS_MOUNT_COMPRESS            (1 << 5)
1166 #define BTRFS_MOUNT_NOTREELOG           (1 << 6)
1167 #define BTRFS_MOUNT_FLUSHONCOMMIT       (1 << 7)
1168 #define BTRFS_MOUNT_SSD_SPREAD          (1 << 8)
1169 #define BTRFS_MOUNT_NOSSD               (1 << 9)
1170 #define BTRFS_MOUNT_DISCARD             (1 << 10)
1171 #define BTRFS_MOUNT_FORCE_COMPRESS      (1 << 11)
1172 #define BTRFS_MOUNT_SPACE_CACHE         (1 << 12)
1173 #define BTRFS_MOUNT_CLEAR_CACHE         (1 << 13)
1174 #define BTRFS_MOUNT_USER_SUBVOL_RM_ALLOWED (1 << 14)
1175 #define BTRFS_MOUNT_ENOSPC_DEBUG         (1 << 15)
1176 #define BTRFS_MOUNT_AUTO_DEFRAG         (1 << 16)
1177 #define BTRFS_MOUNT_INODE_MAP_CACHE     (1 << 17)
1178 #define BTRFS_MOUNT_USEBACKUPROOT       (1 << 18)
1179 #define BTRFS_MOUNT_SKIP_BALANCE        (1 << 19)
1180 #define BTRFS_MOUNT_CHECK_INTEGRITY     (1 << 20)
1181 #define BTRFS_MOUNT_CHECK_INTEGRITY_INCLUDING_EXTENT_DATA (1 << 21)
1182 #define BTRFS_MOUNT_PANIC_ON_FATAL_ERROR        (1 << 22)
1183 #define BTRFS_MOUNT_RESCAN_UUID_TREE    (1 << 23)
1184 #define BTRFS_MOUNT_FRAGMENT_DATA       (1 << 24)
1185 #define BTRFS_MOUNT_FRAGMENT_METADATA   (1 << 25)
1186 #define BTRFS_MOUNT_FREE_SPACE_TREE     (1 << 26)
1187 #define BTRFS_MOUNT_NOLOGREPLAY         (1 << 27)
1188 #define BTRFS_MOUNT_REF_VERIFY          (1 << 28)
1189 
1190 #define BTRFS_DEFAULT_COMMIT_INTERVAL   (30)
1191 #define BTRFS_DEFAULT_MAX_INLINE        (2048)
1192 
1193 #define btrfs_clear_opt(o, opt)         ((o) &= ~BTRFS_MOUNT_##opt)
1194 #define btrfs_set_opt(o, opt)           ((o) |= BTRFS_MOUNT_##opt)
1195 #define btrfs_raw_test_opt(o, opt)      ((o) & BTRFS_MOUNT_##opt)
1196 #define btrfs_test_opt(fs_info, opt)    ((fs_info)->mount_opt & \
1197                                          BTRFS_MOUNT_##opt)
1198 
1199 #define btrfs_set_and_info(fs_info, opt, fmt, args...)                  \
1200 {                                                                       \
1201         if (!btrfs_test_opt(fs_info, opt))                              \
1202                 btrfs_info(fs_info, fmt, ##args);                       \
1203         btrfs_set_opt(fs_info->mount_opt, opt);                         \
1204 }
1205 
1206 #define btrfs_clear_and_info(fs_info, opt, fmt, args...)                \
1207 {                                                                       \
1208         if (btrfs_test_opt(fs_info, opt))                               \
1209                 btrfs_info(fs_info, fmt, ##args);                       \
1210         btrfs_clear_opt(fs_info->mount_opt, opt);                       \
1211 }
1212 
1213 /*
1214  * Requests for changes that need to be done during transaction commit.
1215  *
1216  * Internal mount options that are used for special handling of the real
1217  * mount options (eg. cannot be set during remount and have to be set during
1218  * transaction commit)
1219  */
1220 
1221 #define BTRFS_PENDING_SET_INODE_MAP_CACHE       (0)
1222 #define BTRFS_PENDING_CLEAR_INODE_MAP_CACHE     (1)
1223 #define BTRFS_PENDING_COMMIT                    (2)
1224 
1225 #define btrfs_test_pending(info, opt)   \
1226         test_bit(BTRFS_PENDING_##opt, &(info)->pending_changes)
1227 #define btrfs_set_pending(info, opt)    \
1228         set_bit(BTRFS_PENDING_##opt, &(info)->pending_changes)
1229 #define btrfs_clear_pending(info, opt)  \
1230         clear_bit(BTRFS_PENDING_##opt, &(info)->pending_changes)
1231 
1232 /*
1233  * Helpers for setting pending mount option changes.
1234  *
1235  * Expects corresponding macros
1236  * BTRFS_PENDING_SET_ and CLEAR_ + short mount option name
1237  */
1238 #define btrfs_set_pending_and_info(info, opt, fmt, args...)            \
1239 do {                                                                   \
1240        if (!btrfs_raw_test_opt((info)->mount_opt, opt)) {              \
1241                btrfs_info((info), fmt, ##args);                        \
1242                btrfs_set_pending((info), SET_##opt);                   \
1243                btrfs_clear_pending((info), CLEAR_##opt);               \
1244        }                                                               \
1245 } while(0)
1246 
1247 #define btrfs_clear_pending_and_info(info, opt, fmt, args...)          \
1248 do {                                                                   \
1249        if (btrfs_raw_test_opt((info)->mount_opt, opt)) {               \
1250                btrfs_info((info), fmt, ##args);                        \
1251                btrfs_set_pending((info), CLEAR_##opt);                 \
1252                btrfs_clear_pending((info), SET_##opt);                 \
1253        }                                                               \
1254 } while(0)
1255 
1256 /*
1257  * Inode flags
1258  */
1259 #define BTRFS_INODE_NODATASUM           (1 << 0)
1260 #define BTRFS_INODE_NODATACOW           (1 << 1)
1261 #define BTRFS_INODE_READONLY            (1 << 2)
1262 #define BTRFS_INODE_NOCOMPRESS          (1 << 3)
1263 #define BTRFS_INODE_PREALLOC            (1 << 4)
1264 #define BTRFS_INODE_SYNC                (1 << 5)
1265 #define BTRFS_INODE_IMMUTABLE           (1 << 6)
1266 #define BTRFS_INODE_APPEND              (1 << 7)
1267 #define BTRFS_INODE_NODUMP              (1 << 8)
1268 #define BTRFS_INODE_NOATIME             (1 << 9)
1269 #define BTRFS_INODE_DIRSYNC             (1 << 10)
1270 #define BTRFS_INODE_COMPRESS            (1 << 11)
1271 
1272 #define BTRFS_INODE_ROOT_ITEM_INIT      (1 << 31)
1273 
1274 #define BTRFS_INODE_FLAG_MASK                                           \
1275         (BTRFS_INODE_NODATASUM |                                        \
1276          BTRFS_INODE_NODATACOW |                                        \
1277          BTRFS_INODE_READONLY |                                         \
1278          BTRFS_INODE_NOCOMPRESS |                                       \
1279          BTRFS_INODE_PREALLOC |                                         \
1280          BTRFS_INODE_SYNC |                                             \
1281          BTRFS_INODE_IMMUTABLE |                                        \
1282          BTRFS_INODE_APPEND |                                           \
1283          BTRFS_INODE_NODUMP |                                           \
1284          BTRFS_INODE_NOATIME |                                          \
1285          BTRFS_INODE_DIRSYNC |                                          \
1286          BTRFS_INODE_COMPRESS |                                         \
1287          BTRFS_INODE_ROOT_ITEM_INIT)
1288 
1289 struct btrfs_map_token {
1290         const struct extent_buffer *eb;
1291         char *kaddr;
1292         unsigned long offset;
1293 };
1294 
1295 #define BTRFS_BYTES_TO_BLKS(fs_info, bytes) \
1296                                 ((bytes) >> (fs_info)->sb->s_blocksize_bits)
1297 
1298 static inline void btrfs_init_map_token(struct btrfs_map_token *token,
1299                                         struct extent_buffer *eb)
1300 {
1301         token->eb = eb;
1302         token->kaddr = NULL;
1303 }
1304 
1305 /* some macros to generate set/get functions for the struct fields.  This
1306  * assumes there is a lefoo_to_cpu for every type, so lets make a simple
1307  * one for u8:
1308  */
1309 #define le8_to_cpu(v) (v)
1310 #define cpu_to_le8(v) (v)
1311 #define __le8 u8
1312 
1313 #define read_eb_member(eb, ptr, type, member, result) (\
1314         read_extent_buffer(eb, (char *)(result),                        \
1315                            ((unsigned long)(ptr)) +                     \
1316                             offsetof(type, member),                     \
1317                            sizeof(((type *)0)->member)))
1318 
1319 #define write_eb_member(eb, ptr, type, member, result) (\
1320         write_extent_buffer(eb, (char *)(result),                       \
1321                            ((unsigned long)(ptr)) +                     \
1322                             offsetof(type, member),                     \
1323                            sizeof(((type *)0)->member)))
1324 
1325 #define DECLARE_BTRFS_SETGET_BITS(bits)                                 \
1326 u##bits btrfs_get_token_##bits(const struct extent_buffer *eb,          \
1327                                const void *ptr, unsigned long off,      \
1328                                struct btrfs_map_token *token);          \
1329 void btrfs_set_token_##bits(struct extent_buffer *eb, const void *ptr,  \
1330                             unsigned long off, u##bits val,             \
1331                             struct btrfs_map_token *token);             \
1332 u##bits btrfs_get_##bits(const struct extent_buffer *eb,                \
1333                          const void *ptr, unsigned long off);           \
1334 void btrfs_set_##bits(struct extent_buffer *eb, void *ptr,              \
1335                       unsigned long off, u##bits val);
1336 
1337 DECLARE_BTRFS_SETGET_BITS(8)
1338 DECLARE_BTRFS_SETGET_BITS(16)
1339 DECLARE_BTRFS_SETGET_BITS(32)
1340 DECLARE_BTRFS_SETGET_BITS(64)
1341 
1342 #define BTRFS_SETGET_FUNCS(name, type, member, bits)                    \
1343 static inline u##bits btrfs_##name(const struct extent_buffer *eb,      \
1344                                    const type *s)                       \
1345 {                                                                       \
1346         BUILD_BUG_ON(sizeof(u##bits) != sizeof(((type *)0))->member);   \
1347         return btrfs_get_##bits(eb, s, offsetof(type, member));         \
1348 }                                                                       \
1349 static inline void btrfs_set_##name(struct extent_buffer *eb, type *s,  \
1350                                     u##bits val)                        \
1351 {                                                                       \
1352         BUILD_BUG_ON(sizeof(u##bits) != sizeof(((type *)0))->member);   \
1353         btrfs_set_##bits(eb, s, offsetof(type, member), val);           \
1354 }                                                                       \
1355 static inline u##bits btrfs_token_##name(const struct extent_buffer *eb,\
1356                                          const type *s,                 \
1357                                          struct btrfs_map_token *token) \
1358 {                                                                       \
1359         BUILD_BUG_ON(sizeof(u##bits) != sizeof(((type *)0))->member);   \
1360         return btrfs_get_token_##bits(eb, s, offsetof(type, member), token); \
1361 }                                                                       \
1362 static inline void btrfs_set_token_##name(struct extent_buffer *eb,     \
1363                                           type *s, u##bits val,         \
1364                                          struct btrfs_map_token *token) \
1365 {                                                                       \
1366         BUILD_BUG_ON(sizeof(u##bits) != sizeof(((type *)0))->member);   \
1367         btrfs_set_token_##bits(eb, s, offsetof(type, member), val, token); \
1368 }
1369 
1370 #define BTRFS_SETGET_HEADER_FUNCS(name, type, member, bits)             \
1371 static inline u##bits btrfs_##name(const struct extent_buffer *eb)      \
1372 {                                                                       \
1373         const type *p = page_address(eb->pages[0]);                     \
1374         u##bits res = le##bits##_to_cpu(p->member);                     \
1375         return res;                                                     \
1376 }                                                                       \
1377 static inline void btrfs_set_##name(struct extent_buffer *eb,           \
1378                                     u##bits val)                        \
1379 {                                                                       \
1380         type *p = page_address(eb->pages[0]);                           \
1381         p->member = cpu_to_le##bits(val);                               \
1382 }
1383 
1384 #define BTRFS_SETGET_STACK_FUNCS(name, type, member, bits)              \
1385 static inline u##bits btrfs_##name(const type *s)                       \
1386 {                                                                       \
1387         return le##bits##_to_cpu(s->member);                            \
1388 }                                                                       \
1389 static inline void btrfs_set_##name(type *s, u##bits val)               \
1390 {                                                                       \
1391         s->member = cpu_to_le##bits(val);                               \
1392 }
1393 
1394 
1395 static inline u64 btrfs_device_total_bytes(struct extent_buffer *eb,
1396                                            struct btrfs_dev_item *s)
1397 {
1398         BUILD_BUG_ON(sizeof(u64) !=
1399                      sizeof(((struct btrfs_dev_item *)0))->total_bytes);
1400         return btrfs_get_64(eb, s, offsetof(struct btrfs_dev_item,
1401                                             total_bytes));
1402 }
1403 static inline void btrfs_set_device_total_bytes(struct extent_buffer *eb,
1404                                                 struct btrfs_dev_item *s,
1405                                                 u64 val)
1406 {
1407         BUILD_BUG_ON(sizeof(u64) !=
1408                      sizeof(((struct btrfs_dev_item *)0))->total_bytes);
1409         WARN_ON(!IS_ALIGNED(val, eb->fs_info->sectorsize));
1410         btrfs_set_64(eb, s, offsetof(struct btrfs_dev_item, total_bytes), val);
1411 }
1412 
1413 
1414 BTRFS_SETGET_FUNCS(device_type, struct btrfs_dev_item, type, 64);
1415 BTRFS_SETGET_FUNCS(device_bytes_used, struct btrfs_dev_item, bytes_used, 64);
1416 BTRFS_SETGET_FUNCS(device_io_align, struct btrfs_dev_item, io_align, 32);
1417 BTRFS_SETGET_FUNCS(device_io_width, struct btrfs_dev_item, io_width, 32);
1418 BTRFS_SETGET_FUNCS(device_start_offset, struct btrfs_dev_item,
1419                    start_offset, 64);
1420 BTRFS_SETGET_FUNCS(device_sector_size, struct btrfs_dev_item, sector_size, 32);
1421 BTRFS_SETGET_FUNCS(device_id, struct btrfs_dev_item, devid, 64);
1422 BTRFS_SETGET_FUNCS(device_group, struct btrfs_dev_item, dev_group, 32);
1423 BTRFS_SETGET_FUNCS(device_seek_speed, struct btrfs_dev_item, seek_speed, 8);
1424 BTRFS_SETGET_FUNCS(device_bandwidth, struct btrfs_dev_item, bandwidth, 8);
1425 BTRFS_SETGET_FUNCS(device_generation, struct btrfs_dev_item, generation, 64);
1426 
1427 BTRFS_SETGET_STACK_FUNCS(stack_device_type, struct btrfs_dev_item, type, 64);
1428 BTRFS_SETGET_STACK_FUNCS(stack_device_total_bytes, struct btrfs_dev_item,
1429                          total_bytes, 64);
1430 BTRFS_SETGET_STACK_FUNCS(stack_device_bytes_used, struct btrfs_dev_item,
1431                          bytes_used, 64);
1432 BTRFS_SETGET_STACK_FUNCS(stack_device_io_align, struct btrfs_dev_item,
1433                          io_align, 32);
1434 BTRFS_SETGET_STACK_FUNCS(stack_device_io_width, struct btrfs_dev_item,
1435                          io_width, 32);
1436 BTRFS_SETGET_STACK_FUNCS(stack_device_sector_size, struct btrfs_dev_item,
1437                          sector_size, 32);
1438 BTRFS_SETGET_STACK_FUNCS(stack_device_id, struct btrfs_dev_item, devid, 64);
1439 BTRFS_SETGET_STACK_FUNCS(stack_device_group, struct btrfs_dev_item,
1440                          dev_group, 32);
1441 BTRFS_SETGET_STACK_FUNCS(stack_device_seek_speed, struct btrfs_dev_item,
1442                          seek_speed, 8);
1443 BTRFS_SETGET_STACK_FUNCS(stack_device_bandwidth, struct btrfs_dev_item,
1444                          bandwidth, 8);
1445 BTRFS_SETGET_STACK_FUNCS(stack_device_generation, struct btrfs_dev_item,
1446                          generation, 64);
1447 
1448 static inline unsigned long btrfs_device_uuid(struct btrfs_dev_item *d)
1449 {
1450         return (unsigned long)d + offsetof(struct btrfs_dev_item, uuid);
1451 }
1452 
1453 static inline unsigned long btrfs_device_fsid(struct btrfs_dev_item *d)
1454 {
1455         return (unsigned long)d + offsetof(struct btrfs_dev_item, fsid);
1456 }
1457 
1458 BTRFS_SETGET_FUNCS(chunk_length, struct btrfs_chunk, length, 64);
1459 BTRFS_SETGET_FUNCS(chunk_owner, struct btrfs_chunk, owner, 64);
1460 BTRFS_SETGET_FUNCS(chunk_stripe_len, struct btrfs_chunk, stripe_len, 64);
1461 BTRFS_SETGET_FUNCS(chunk_io_align, struct btrfs_chunk, io_align, 32);
1462 BTRFS_SETGET_FUNCS(chunk_io_width, struct btrfs_chunk, io_width, 32);
1463 BTRFS_SETGET_FUNCS(chunk_sector_size, struct btrfs_chunk, sector_size, 32);
1464 BTRFS_SETGET_FUNCS(chunk_type, struct btrfs_chunk, type, 64);
1465 BTRFS_SETGET_FUNCS(chunk_num_stripes, struct btrfs_chunk, num_stripes, 16);
1466 BTRFS_SETGET_FUNCS(chunk_sub_stripes, struct btrfs_chunk, sub_stripes, 16);
1467 BTRFS_SETGET_FUNCS(stripe_devid, struct btrfs_stripe, devid, 64);
1468 BTRFS_SETGET_FUNCS(stripe_offset, struct btrfs_stripe, offset, 64);
1469 
1470 static inline char *btrfs_stripe_dev_uuid(struct btrfs_stripe *s)
1471 {
1472         return (char *)s + offsetof(struct btrfs_stripe, dev_uuid);
1473 }
1474 
1475 BTRFS_SETGET_STACK_FUNCS(stack_chunk_length, struct btrfs_chunk, length, 64);
1476 BTRFS_SETGET_STACK_FUNCS(stack_chunk_owner, struct btrfs_chunk, owner, 64);
1477 BTRFS_SETGET_STACK_FUNCS(stack_chunk_stripe_len, struct btrfs_chunk,
1478                          stripe_len, 64);
1479 BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_align, struct btrfs_chunk,
1480                          io_align, 32);
1481 BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_width, struct btrfs_chunk,
1482                          io_width, 32);
1483 BTRFS_SETGET_STACK_FUNCS(stack_chunk_sector_size, struct btrfs_chunk,
1484                          sector_size, 32);
1485 BTRFS_SETGET_STACK_FUNCS(stack_chunk_type, struct btrfs_chunk, type, 64);
1486 BTRFS_SETGET_STACK_FUNCS(stack_chunk_num_stripes, struct btrfs_chunk,
1487                          num_stripes, 16);
1488 BTRFS_SETGET_STACK_FUNCS(stack_chunk_sub_stripes, struct btrfs_chunk,
1489                          sub_stripes, 16);
1490 BTRFS_SETGET_STACK_FUNCS(stack_stripe_devid, struct btrfs_stripe, devid, 64);
1491 BTRFS_SETGET_STACK_FUNCS(stack_stripe_offset, struct btrfs_stripe, offset, 64);
1492 
1493 static inline struct btrfs_stripe *btrfs_stripe_nr(struct btrfs_chunk *c,
1494                                                    int nr)
1495 {
1496         unsigned long offset = (unsigned long)c;
1497         offset += offsetof(struct btrfs_chunk, stripe);
1498         offset += nr * sizeof(struct btrfs_stripe);
1499         return (struct btrfs_stripe *)offset;
1500 }
1501 
1502 static inline char *btrfs_stripe_dev_uuid_nr(struct btrfs_chunk *c, int nr)
1503 {
1504         return btrfs_stripe_dev_uuid(btrfs_stripe_nr(c, nr));
1505 }
1506 
1507 static inline u64 btrfs_stripe_offset_nr(struct extent_buffer *eb,
1508                                          struct btrfs_chunk *c, int nr)
1509 {
1510         return btrfs_stripe_offset(eb, btrfs_stripe_nr(c, nr));
1511 }
1512 
1513 static inline u64 btrfs_stripe_devid_nr(struct extent_buffer *eb,
1514                                          struct btrfs_chunk *c, int nr)
1515 {
1516         return btrfs_stripe_devid(eb, btrfs_stripe_nr(c, nr));
1517 }
1518 
1519 /* struct btrfs_block_group_item */
1520 BTRFS_SETGET_STACK_FUNCS(block_group_used, struct btrfs_block_group_item,
1521                          used, 64);
1522 BTRFS_SETGET_FUNCS(disk_block_group_used, struct btrfs_block_group_item,
1523                          used, 64);
1524 BTRFS_SETGET_STACK_FUNCS(block_group_chunk_objectid,
1525                         struct btrfs_block_group_item, chunk_objectid, 64);
1526 
1527 BTRFS_SETGET_FUNCS(disk_block_group_chunk_objectid,
1528                    struct btrfs_block_group_item, chunk_objectid, 64);
1529 BTRFS_SETGET_FUNCS(disk_block_group_flags,
1530                    struct btrfs_block_group_item, flags, 64);
1531 BTRFS_SETGET_STACK_FUNCS(block_group_flags,
1532                         struct btrfs_block_group_item, flags, 64);
1533 
1534 /* struct btrfs_free_space_info */
1535 BTRFS_SETGET_FUNCS(free_space_extent_count, struct btrfs_free_space_info,
1536                    extent_count, 32);
1537 BTRFS_SETGET_FUNCS(free_space_flags, struct btrfs_free_space_info, flags, 32);
1538 
1539 /* struct btrfs_inode_ref */
1540 BTRFS_SETGET_FUNCS(inode_ref_name_len, struct btrfs_inode_ref, name_len, 16);
1541 BTRFS_SETGET_FUNCS(inode_ref_index, struct btrfs_inode_ref, index, 64);
1542 
1543 /* struct btrfs_inode_extref */
1544 BTRFS_SETGET_FUNCS(inode_extref_parent, struct btrfs_inode_extref,
1545                    parent_objectid, 64);
1546 BTRFS_SETGET_FUNCS(inode_extref_name_len, struct btrfs_inode_extref,
1547                    name_len, 16);
1548 BTRFS_SETGET_FUNCS(inode_extref_index, struct btrfs_inode_extref, index, 64);
1549 
1550 /* struct btrfs_inode_item */
1551 BTRFS_SETGET_FUNCS(inode_generation, struct btrfs_inode_item, generation, 64);
1552 BTRFS_SETGET_FUNCS(inode_sequence, struct btrfs_inode_item, sequence, 64);
1553 BTRFS_SETGET_FUNCS(inode_transid, struct btrfs_inode_item, transid, 64);
1554 BTRFS_SETGET_FUNCS(inode_size, struct btrfs_inode_item, size, 64);
1555 BTRFS_SETGET_FUNCS(inode_nbytes, struct btrfs_inode_item, nbytes, 64);
1556 BTRFS_SETGET_FUNCS(inode_block_group, struct btrfs_inode_item, block_group, 64);
1557 BTRFS_SETGET_FUNCS(inode_nlink, struct btrfs_inode_item, nlink, 32);
1558 BTRFS_SETGET_FUNCS(inode_uid, struct btrfs_inode_item, uid, 32);
1559 BTRFS_SETGET_FUNCS(inode_gid, struct btrfs_inode_item, gid, 32);
1560 BTRFS_SETGET_FUNCS(inode_mode, struct btrfs_inode_item, mode, 32);
1561 BTRFS_SETGET_FUNCS(inode_rdev, struct btrfs_inode_item, rdev, 64);
1562 BTRFS_SETGET_FUNCS(inode_flags, struct btrfs_inode_item, flags, 64);
1563 BTRFS_SETGET_STACK_FUNCS(stack_inode_generation, struct btrfs_inode_item,
1564                          generation, 64);
1565 BTRFS_SETGET_STACK_FUNCS(stack_inode_sequence, struct btrfs_inode_item,
1566                          sequence, 64);
1567 BTRFS_SETGET_STACK_FUNCS(stack_inode_transid, struct btrfs_inode_item,
1568                          transid, 64);
1569 BTRFS_SETGET_STACK_FUNCS(stack_inode_size, struct btrfs_inode_item, size, 64);
1570 BTRFS_SETGET_STACK_FUNCS(stack_inode_nbytes, struct btrfs_inode_item,
1571                          nbytes, 64);
1572 BTRFS_SETGET_STACK_FUNCS(stack_inode_block_group, struct btrfs_inode_item,
1573                          block_group, 64);
1574 BTRFS_SETGET_STACK_FUNCS(stack_inode_nlink, struct btrfs_inode_item, nlink, 32);
1575 BTRFS_SETGET_STACK_FUNCS(stack_inode_uid, struct btrfs_inode_item, uid, 32);
1576 BTRFS_SETGET_STACK_FUNCS(stack_inode_gid, struct btrfs_inode_item, gid, 32);
1577 BTRFS_SETGET_STACK_FUNCS(stack_inode_mode, struct btrfs_inode_item, mode, 32);
1578 BTRFS_SETGET_STACK_FUNCS(stack_inode_rdev, struct btrfs_inode_item, rdev, 64);
1579 BTRFS_SETGET_STACK_FUNCS(stack_inode_flags, struct btrfs_inode_item, flags, 64);
1580 BTRFS_SETGET_FUNCS(timespec_sec, struct btrfs_timespec, sec, 64);
1581 BTRFS_SETGET_FUNCS(timespec_nsec, struct btrfs_timespec, nsec, 32);
1582 BTRFS_SETGET_STACK_FUNCS(stack_timespec_sec, struct btrfs_timespec, sec, 64);
1583 BTRFS_SETGET_STACK_FUNCS(stack_timespec_nsec, struct btrfs_timespec, nsec, 32);
1584 
1585 /* struct btrfs_dev_extent */
1586 BTRFS_SETGET_FUNCS(dev_extent_chunk_tree, struct btrfs_dev_extent,
1587                    chunk_tree, 64);
1588 BTRFS_SETGET_FUNCS(dev_extent_chunk_objectid, struct btrfs_dev_extent,
1589                    chunk_objectid, 64);
1590 BTRFS_SETGET_FUNCS(dev_extent_chunk_offset, struct btrfs_dev_extent,
1591                    chunk_offset, 64);
1592 BTRFS_SETGET_FUNCS(dev_extent_length, struct btrfs_dev_extent, length, 64);
1593 
1594 static inline unsigned long btrfs_dev_extent_chunk_tree_uuid(struct btrfs_dev_extent *dev)
1595 {
1596         unsigned long ptr = offsetof(struct btrfs_dev_extent, chunk_tree_uuid);
1597         return (unsigned long)dev + ptr;
1598 }
1599 
1600 BTRFS_SETGET_FUNCS(extent_refs, struct btrfs_extent_item, refs, 64);
1601 BTRFS_SETGET_FUNCS(extent_generation, struct btrfs_extent_item,
1602                    generation, 64);
1603 BTRFS_SETGET_FUNCS(extent_flags, struct btrfs_extent_item, flags, 64);
1604 
1605 BTRFS_SETGET_FUNCS(extent_refs_v0, struct btrfs_extent_item_v0, refs, 32);
1606 
1607 
1608 BTRFS_SETGET_FUNCS(tree_block_level, struct btrfs_tree_block_info, level, 8);
1609 
1610 static inline void btrfs_tree_block_key(struct extent_buffer *eb,
1611                                         struct btrfs_tree_block_info *item,
1612                                         struct btrfs_disk_key *key)
1613 {
1614         read_eb_member(eb, item, struct btrfs_tree_block_info, key, key);
1615 }
1616 
1617 static inline void btrfs_set_tree_block_key(struct extent_buffer *eb,
1618                                             struct btrfs_tree_block_info *item,
1619                                             struct btrfs_disk_key *key)
1620 {
1621         write_eb_member(eb, item, struct btrfs_tree_block_info, key, key);
1622 }
1623 
1624 BTRFS_SETGET_FUNCS(extent_data_ref_root, struct btrfs_extent_data_ref,
1625                    root, 64);
1626 BTRFS_SETGET_FUNCS(extent_data_ref_objectid, struct btrfs_extent_data_ref,
1627                    objectid, 64);
1628 BTRFS_SETGET_FUNCS(extent_data_ref_offset, struct btrfs_extent_data_ref,
1629                    offset, 64);
1630 BTRFS_SETGET_FUNCS(extent_data_ref_count, struct btrfs_extent_data_ref,
1631                    count, 32);
1632 
1633 BTRFS_SETGET_FUNCS(shared_data_ref_count, struct btrfs_shared_data_ref,
1634                    count, 32);
1635 
1636 BTRFS_SETGET_FUNCS(extent_inline_ref_type, struct btrfs_extent_inline_ref,
1637                    type, 8);
1638 BTRFS_SETGET_FUNCS(extent_inline_ref_offset, struct btrfs_extent_inline_ref,
1639                    offset, 64);
1640 
1641 static inline u32 btrfs_extent_inline_ref_size(int type)
1642 {
1643         if (type == BTRFS_TREE_BLOCK_REF_KEY ||
1644             type == BTRFS_SHARED_BLOCK_REF_KEY)
1645                 return sizeof(struct btrfs_extent_inline_ref);
1646         if (type == BTRFS_SHARED_DATA_REF_KEY)
1647                 return sizeof(struct btrfs_shared_data_ref) +
1648                        sizeof(struct btrfs_extent_inline_ref);
1649         if (type == BTRFS_EXTENT_DATA_REF_KEY)
1650                 return sizeof(struct btrfs_extent_data_ref) +
1651                        offsetof(struct btrfs_extent_inline_ref, offset);
1652         return 0;
1653 }
1654 
1655 BTRFS_SETGET_FUNCS(ref_root_v0, struct btrfs_extent_ref_v0, root, 64);
1656 BTRFS_SETGET_FUNCS(ref_generation_v0, struct btrfs_extent_ref_v0,
1657                    generation, 64);
1658 BTRFS_SETGET_FUNCS(ref_objectid_v0, struct btrfs_extent_ref_v0, objectid, 64);
1659 BTRFS_SETGET_FUNCS(ref_count_v0, struct btrfs_extent_ref_v0, count, 32);
1660 
1661 /* struct btrfs_node */
1662 BTRFS_SETGET_FUNCS(key_blockptr, struct btrfs_key_ptr, blockptr, 64);
1663 BTRFS_SETGET_FUNCS(key_generation, struct btrfs_key_ptr, generation, 64);
1664 BTRFS_SETGET_STACK_FUNCS(stack_key_blockptr, struct btrfs_key_ptr,
1665                          blockptr, 64);
1666 BTRFS_SETGET_STACK_FUNCS(stack_key_generation, struct btrfs_key_ptr,
1667                          generation, 64);
1668 
1669 static inline u64 btrfs_node_blockptr(struct extent_buffer *eb, int nr)
1670 {
1671         unsigned long ptr;
1672         ptr = offsetof(struct btrfs_node, ptrs) +
1673                 sizeof(struct btrfs_key_ptr) * nr;
1674         return btrfs_key_blockptr(eb, (struct btrfs_key_ptr *)ptr);
1675 }
1676 
1677 static inline void btrfs_set_node_blockptr(struct extent_buffer *eb,
1678                                            int nr, u64 val)
1679 {
1680         unsigned long ptr;
1681         ptr = offsetof(struct btrfs_node, ptrs) +
1682                 sizeof(struct btrfs_key_ptr) * nr;
1683         btrfs_set_key_blockptr(eb, (struct btrfs_key_ptr *)ptr, val);
1684 }
1685 
1686 static inline u64 btrfs_node_ptr_generation(struct extent_buffer *eb, int nr)
1687 {
1688         unsigned long ptr;
1689         ptr = offsetof(struct btrfs_node, ptrs) +
1690                 sizeof(struct btrfs_key_ptr) * nr;
1691         return btrfs_key_generation(eb, (struct btrfs_key_ptr *)ptr);
1692 }
1693 
1694 static inline void btrfs_set_node_ptr_generation(struct extent_buffer *eb,
1695                                                  int nr, u64 val)
1696 {
1697         unsigned long ptr;
1698         ptr = offsetof(struct btrfs_node, ptrs) +
1699                 sizeof(struct btrfs_key_ptr) * nr;
1700         btrfs_set_key_generation(eb, (struct btrfs_key_ptr *)ptr, val);
1701 }
1702 
1703 static inline unsigned long btrfs_node_key_ptr_offset(int nr)
1704 {
1705         return offsetof(struct btrfs_node, ptrs) +
1706                 sizeof(struct btrfs_key_ptr) * nr;
1707 }
1708 
1709 void btrfs_node_key(const struct extent_buffer *eb,
1710                     struct btrfs_disk_key *disk_key, int nr);
1711 
1712 static inline void btrfs_set_node_key(struct extent_buffer *eb,
1713                                       struct btrfs_disk_key *disk_key, int nr)
1714 {
1715         unsigned long ptr;
1716         ptr = btrfs_node_key_ptr_offset(nr);
1717         write_eb_member(eb, (struct btrfs_key_ptr *)ptr,
1718                        struct btrfs_key_ptr, key, disk_key);
1719 }
1720 
1721 /* struct btrfs_item */
1722 BTRFS_SETGET_FUNCS(item_offset, struct btrfs_item, offset, 32);
1723 BTRFS_SETGET_FUNCS(item_size, struct btrfs_item, size, 32);
1724 BTRFS_SETGET_STACK_FUNCS(stack_item_offset, struct btrfs_item, offset, 32);
1725 BTRFS_SETGET_STACK_FUNCS(stack_item_size, struct btrfs_item, size, 32);
1726 
1727 static inline unsigned long btrfs_item_nr_offset(int nr)
1728 {
1729         return offsetof(struct btrfs_leaf, items) +
1730                 sizeof(struct btrfs_item) * nr;
1731 }
1732 
1733 static inline struct btrfs_item *btrfs_item_nr(int nr)
1734 {
1735         return (struct btrfs_item *)btrfs_item_nr_offset(nr);
1736 }
1737 
1738 static inline u32 btrfs_item_end(const struct extent_buffer *eb,
1739                                  struct btrfs_item *item)
1740 {
1741         return btrfs_item_offset(eb, item) + btrfs_item_size(eb, item);
1742 }
1743 
1744 static inline u32 btrfs_item_end_nr(const struct extent_buffer *eb, int nr)
1745 {
1746         return btrfs_item_end(eb, btrfs_item_nr(nr));
1747 }
1748 
1749 static inline u32 btrfs_item_offset_nr(const struct extent_buffer *eb, int nr)
1750 {
1751         return btrfs_item_offset(eb, btrfs_item_nr(nr));
1752 }
1753 
1754 static inline u32 btrfs_item_size_nr(const struct extent_buffer *eb, int nr)
1755 {
1756         return btrfs_item_size(eb, btrfs_item_nr(nr));
1757 }
1758 
1759 static inline void btrfs_item_key(const struct extent_buffer *eb,
1760                            struct btrfs_disk_key *disk_key, int nr)
1761 {
1762         struct btrfs_item *item = btrfs_item_nr(nr);
1763         read_eb_member(eb, item, struct btrfs_item, key, disk_key);
1764 }
1765 
1766 static inline void btrfs_set_item_key(struct extent_buffer *eb,
1767                                struct btrfs_disk_key *disk_key, int nr)
1768 {
1769         struct btrfs_item *item = btrfs_item_nr(nr);
1770         write_eb_member(eb, item, struct btrfs_item, key, disk_key);
1771 }
1772 
1773 BTRFS_SETGET_FUNCS(dir_log_end, struct btrfs_dir_log_item, end, 64);
1774 
1775 /*
1776  * struct btrfs_root_ref
1777  */
1778 BTRFS_SETGET_FUNCS(root_ref_dirid, struct btrfs_root_ref, dirid, 64);
1779 BTRFS_SETGET_FUNCS(root_ref_sequence, struct btrfs_root_ref, sequence, 64);
1780 BTRFS_SETGET_FUNCS(root_ref_name_len, struct btrfs_root_ref, name_len, 16);
1781 
1782 /* struct btrfs_dir_item */
1783 BTRFS_SETGET_FUNCS(dir_data_len, struct btrfs_dir_item, data_len, 16);
1784 BTRFS_SETGET_FUNCS(dir_type, struct btrfs_dir_item, type, 8);
1785 BTRFS_SETGET_FUNCS(dir_name_len, struct btrfs_dir_item, name_len, 16);
1786 BTRFS_SETGET_FUNCS(dir_transid, struct btrfs_dir_item, transid, 64);
1787 BTRFS_SETGET_STACK_FUNCS(stack_dir_type, struct btrfs_dir_item, type, 8);
1788 BTRFS_SETGET_STACK_FUNCS(stack_dir_data_len, struct btrfs_dir_item,
1789                          data_len, 16);
1790 BTRFS_SETGET_STACK_FUNCS(stack_dir_name_len, struct btrfs_dir_item,
1791                          name_len, 16);
1792 BTRFS_SETGET_STACK_FUNCS(stack_dir_transid, struct btrfs_dir_item,
1793                          transid, 64);
1794 
1795 static inline void btrfs_dir_item_key(const struct extent_buffer *eb,
1796                                       const struct btrfs_dir_item *item,
1797                                       struct btrfs_disk_key *key)
1798 {
1799         read_eb_member(eb, item, struct btrfs_dir_item, location, key);
1800 }
1801 
1802 static inline void btrfs_set_dir_item_key(struct extent_buffer *eb,
1803                                           struct btrfs_dir_item *item,
1804                                           const struct btrfs_disk_key *key)
1805 {
1806         write_eb_member(eb, item, struct btrfs_dir_item, location, key);
1807 }
1808 
1809 BTRFS_SETGET_FUNCS(free_space_entries, struct btrfs_free_space_header,
1810                    num_entries, 64);
1811 BTRFS_SETGET_FUNCS(free_space_bitmaps, struct btrfs_free_space_header,
1812                    num_bitmaps, 64);
1813 BTRFS_SETGET_FUNCS(free_space_generation, struct btrfs_free_space_header,
1814                    generation, 64);
1815 
1816 static inline void btrfs_free_space_key(const struct extent_buffer *eb,
1817                                         const struct btrfs_free_space_header *h,
1818                                         struct btrfs_disk_key *key)
1819 {
1820         read_eb_member(eb, h, struct btrfs_free_space_header, location, key);
1821 }
1822 
1823 static inline void btrfs_set_free_space_key(struct extent_buffer *eb,
1824                                             struct btrfs_free_space_header *h,
1825                                             const struct btrfs_disk_key *key)
1826 {
1827         write_eb_member(eb, h, struct btrfs_free_space_header, location, key);
1828 }
1829 
1830 /* struct btrfs_disk_key */
1831 BTRFS_SETGET_STACK_FUNCS(disk_key_objectid, struct btrfs_disk_key,
1832                          objectid, 64);
1833 BTRFS_SETGET_STACK_FUNCS(disk_key_offset, struct btrfs_disk_key, offset, 64);
1834 BTRFS_SETGET_STACK_FUNCS(disk_key_type, struct btrfs_disk_key, type, 8);
1835 
1836 static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu,
1837                                          const struct btrfs_disk_key *disk)
1838 {
1839         cpu->offset = le64_to_cpu(disk->offset);
1840         cpu->type = disk->type;
1841         cpu->objectid = le64_to_cpu(disk->objectid);
1842 }
1843 
1844 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk,
1845                                          const struct btrfs_key *cpu)
1846 {
1847         disk->offset = cpu_to_le64(cpu->offset);
1848         disk->type = cpu->type;
1849         disk->objectid = cpu_to_le64(cpu->objectid);
1850 }
1851 
1852 static inline void btrfs_node_key_to_cpu(const struct extent_buffer *eb,
1853                                          struct btrfs_key *key, int nr)
1854 {
1855         struct btrfs_disk_key disk_key;
1856         btrfs_node_key(eb, &disk_key, nr);
1857         btrfs_disk_key_to_cpu(key, &disk_key);
1858 }
1859 
1860 static inline void btrfs_item_key_to_cpu(const struct extent_buffer *eb,
1861                                          struct btrfs_key *key, int nr)
1862 {
1863         struct btrfs_disk_key disk_key;
1864         btrfs_item_key(eb, &disk_key, nr);
1865         btrfs_disk_key_to_cpu(key, &disk_key);
1866 }
1867 
1868 static inline void btrfs_dir_item_key_to_cpu(const struct extent_buffer *eb,
1869                                              const struct btrfs_dir_item *item,
1870                                              struct btrfs_key *key)
1871 {
1872         struct btrfs_disk_key disk_key;
1873         btrfs_dir_item_key(eb, item, &disk_key);
1874         btrfs_disk_key_to_cpu(key, &disk_key);
1875 }
1876 
1877 /* struct btrfs_header */
1878 BTRFS_SETGET_HEADER_FUNCS(header_bytenr, struct btrfs_header, bytenr, 64);
1879 BTRFS_SETGET_HEADER_FUNCS(header_generation, struct btrfs_header,
1880                           generation, 64);
1881 BTRFS_SETGET_HEADER_FUNCS(header_owner, struct btrfs_header, owner, 64);
1882 BTRFS_SETGET_HEADER_FUNCS(header_nritems, struct btrfs_header, nritems, 32);
1883 BTRFS_SETGET_HEADER_FUNCS(header_flags, struct btrfs_header, flags, 64);
1884 BTRFS_SETGET_HEADER_FUNCS(header_level, struct btrfs_header, level, 8);
1885 BTRFS_SETGET_STACK_FUNCS(stack_header_generation, struct btrfs_header,
1886                          generation, 64);
1887 BTRFS_SETGET_STACK_FUNCS(stack_header_owner, struct btrfs_header, owner, 64);
1888 BTRFS_SETGET_STACK_FUNCS(stack_header_nritems, struct btrfs_header,
1889                          nritems, 32);
1890 BTRFS_SETGET_STACK_FUNCS(stack_header_bytenr, struct btrfs_header, bytenr, 64);
1891 
1892 static inline int btrfs_header_flag(const struct extent_buffer *eb, u64 flag)
1893 {
1894         return (btrfs_header_flags(eb) & flag) == flag;
1895 }
1896 
1897 static inline void btrfs_set_header_flag(struct extent_buffer *eb, u64 flag)
1898 {
1899         u64 flags = btrfs_header_flags(eb);
1900         btrfs_set_header_flags(eb, flags | flag);
1901 }
1902 
1903 static inline void btrfs_clear_header_flag(struct extent_buffer *eb, u64 flag)
1904 {
1905         u64 flags = btrfs_header_flags(eb);
1906         btrfs_set_header_flags(eb, flags & ~flag);
1907 }
1908 
1909 static inline int btrfs_header_backref_rev(const struct extent_buffer *eb)
1910 {
1911         u64 flags = btrfs_header_flags(eb);
1912         return flags >> BTRFS_BACKREF_REV_SHIFT;
1913 }
1914 
1915 static inline void btrfs_set_header_backref_rev(struct extent_buffer *eb,
1916                                                 int rev)
1917 {
1918         u64 flags = btrfs_header_flags(eb);
1919         flags &= ~BTRFS_BACKREF_REV_MASK;
1920         flags |= (u64)rev << BTRFS_BACKREF_REV_SHIFT;
1921         btrfs_set_header_flags(eb, flags);
1922 }
1923 
1924 static inline unsigned long btrfs_header_fsid(void)
1925 {
1926         return offsetof(struct btrfs_header, fsid);
1927 }
1928 
1929 static inline unsigned long btrfs_header_chunk_tree_uuid(const struct extent_buffer *eb)
1930 {
1931         return offsetof(struct btrfs_header, chunk_tree_uuid);
1932 }
1933 
1934 static inline int btrfs_is_leaf(const struct extent_buffer *eb)
1935 {
1936         return btrfs_header_level(eb) == 0;
1937 }
1938 
1939 /* struct btrfs_root_item */
1940 BTRFS_SETGET_FUNCS(disk_root_generation, struct btrfs_root_item,
1941                    generation, 64);
1942 BTRFS_SETGET_FUNCS(disk_root_refs, struct btrfs_root_item, refs, 32);
1943 BTRFS_SETGET_FUNCS(disk_root_bytenr, struct btrfs_root_item, bytenr, 64);
1944 BTRFS_SETGET_FUNCS(disk_root_level, struct btrfs_root_item, level, 8);
1945 
1946 BTRFS_SETGET_STACK_FUNCS(root_generation, struct btrfs_root_item,
1947                          generation, 64);
1948 BTRFS_SETGET_STACK_FUNCS(root_bytenr, struct btrfs_root_item, bytenr, 64);
1949 BTRFS_SETGET_STACK_FUNCS(root_level, struct btrfs_root_item, level, 8);
1950 BTRFS_SETGET_STACK_FUNCS(root_dirid, struct btrfs_root_item, root_dirid, 64);
1951 BTRFS_SETGET_STACK_FUNCS(root_refs, struct btrfs_root_item, refs, 32);
1952 BTRFS_SETGET_STACK_FUNCS(root_flags, struct btrfs_root_item, flags, 64);
1953 BTRFS_SETGET_STACK_FUNCS(root_used, struct btrfs_root_item, bytes_used, 64);
1954 BTRFS_SETGET_STACK_FUNCS(root_limit, struct btrfs_root_item, byte_limit, 64);
1955 BTRFS_SETGET_STACK_FUNCS(root_last_snapshot, struct btrfs_root_item,
1956                          last_snapshot, 64);
1957 BTRFS_SETGET_STACK_FUNCS(root_generation_v2, struct btrfs_root_item,
1958                          generation_v2, 64);
1959 BTRFS_SETGET_STACK_FUNCS(root_ctransid, struct btrfs_root_item,
1960                          ctransid, 64);
1961 BTRFS_SETGET_STACK_FUNCS(root_otransid, struct btrfs_root_item,
1962                          otransid, 64);
1963 BTRFS_SETGET_STACK_FUNCS(root_stransid, struct btrfs_root_item,
1964                          stransid, 64);
1965 BTRFS_SETGET_STACK_FUNCS(root_rtransid, struct btrfs_root_item,
1966                          rtransid, 64);
1967 
1968 static inline bool btrfs_root_readonly(const struct btrfs_root *root)
1969 {
1970         return (root->root_item.flags & cpu_to_le64(BTRFS_ROOT_SUBVOL_RDONLY)) != 0;
1971 }
1972 
1973 static inline bool btrfs_root_dead(const struct btrfs_root *root)
1974 {
1975         return (root->root_item.flags & cpu_to_le64(BTRFS_ROOT_SUBVOL_DEAD)) != 0;
1976 }
1977 
1978 /* struct btrfs_root_backup */
1979 BTRFS_SETGET_STACK_FUNCS(backup_tree_root, struct btrfs_root_backup,
1980                    tree_root, 64);
1981 BTRFS_SETGET_STACK_FUNCS(backup_tree_root_gen, struct btrfs_root_backup,
1982                    tree_root_gen, 64);
1983 BTRFS_SETGET_STACK_FUNCS(backup_tree_root_level, struct btrfs_root_backup,
1984                    tree_root_level, 8);
1985 
1986 BTRFS_SETGET_STACK_FUNCS(backup_chunk_root, struct btrfs_root_backup,
1987                    chunk_root, 64);
1988 BTRFS_SETGET_STACK_FUNCS(backup_chunk_root_gen, struct btrfs_root_backup,
1989                    chunk_root_gen, 64);
1990 BTRFS_SETGET_STACK_FUNCS(backup_chunk_root_level, struct btrfs_root_backup,
1991                    chunk_root_level, 8);
1992 
1993 BTRFS_SETGET_STACK_FUNCS(backup_extent_root, struct btrfs_root_backup,
1994                    extent_root, 64);
1995 BTRFS_SETGET_STACK_FUNCS(backup_extent_root_gen, struct btrfs_root_backup,
1996                    extent_root_gen, 64);
1997 BTRFS_SETGET_STACK_FUNCS(backup_extent_root_level, struct btrfs_root_backup,
1998                    extent_root_level, 8);
1999 
2000 BTRFS_SETGET_STACK_FUNCS(backup_fs_root, struct btrfs_root_backup,
2001                    fs_root, 64);
2002 BTRFS_SETGET_STACK_FUNCS(backup_fs_root_gen, struct btrfs_root_backup,
2003                    fs_root_gen, 64);
2004 BTRFS_SETGET_STACK_FUNCS(backup_fs_root_level, struct btrfs_root_backup,
2005                    fs_root_level, 8);
2006 
2007 BTRFS_SETGET_STACK_FUNCS(backup_dev_root, struct btrfs_root_backup,
2008                    dev_root, 64);
2009 BTRFS_SETGET_STACK_FUNCS(backup_dev_root_gen, struct btrfs_root_backup,
2010                    dev_root_gen, 64);
2011 BTRFS_SETGET_STACK_FUNCS(backup_dev_root_level, struct btrfs_root_backup,
2012                    dev_root_level, 8);
2013 
2014 BTRFS_SETGET_STACK_FUNCS(backup_csum_root, struct btrfs_root_backup,
2015                    csum_root, 64);
2016 BTRFS_SETGET_STACK_FUNCS(backup_csum_root_gen, struct btrfs_root_backup,
2017                    csum_root_gen, 64);
2018 BTRFS_SETGET_STACK_FUNCS(backup_csum_root_level, struct btrfs_root_backup,
2019                    csum_root_level, 8);
2020 BTRFS_SETGET_STACK_FUNCS(backup_total_bytes, struct btrfs_root_backup,
2021                    total_bytes, 64);
2022 BTRFS_SETGET_STACK_FUNCS(backup_bytes_used, struct btrfs_root_backup,
2023                    bytes_used, 64);
2024 BTRFS_SETGET_STACK_FUNCS(backup_num_devices, struct btrfs_root_backup,
2025                    num_devices, 64);
2026 
2027 /* struct btrfs_balance_item */
2028 BTRFS_SETGET_FUNCS(balance_flags, struct btrfs_balance_item, flags, 64);
2029 
2030 static inline void btrfs_balance_data(const struct extent_buffer *eb,
2031                                       const struct btrfs_balance_item *bi,
2032                                       struct btrfs_disk_balance_args *ba)
2033 {
2034         read_eb_member(eb, bi, struct btrfs_balance_item, data, ba);
2035 }
2036 
2037 static inline void btrfs_set_balance_data(struct extent_buffer *eb,
2038                                   struct btrfs_balance_item *bi,
2039                                   const struct btrfs_disk_balance_args *ba)
2040 {
2041         write_eb_member(eb, bi, struct btrfs_balance_item, data, ba);
2042 }
2043 
2044 static inline void btrfs_balance_meta(const struct extent_buffer *eb,
2045                                       const struct btrfs_balance_item *bi,
2046                                       struct btrfs_disk_balance_args *ba)
2047 {
2048         read_eb_member(eb, bi, struct btrfs_balance_item, meta, ba);
2049 }
2050 
2051 static inline void btrfs_set_balance_meta(struct extent_buffer *eb,
2052                                   struct btrfs_balance_item *bi,
2053                                   const struct btrfs_disk_balance_args *ba)
2054 {
2055         write_eb_member(eb, bi, struct btrfs_balance_item, meta, ba);
2056 }
2057 
2058 static inline void btrfs_balance_sys(const struct extent_buffer *eb,
2059                                      const struct btrfs_balance_item *bi,
2060                                      struct btrfs_disk_balance_args *ba)
2061 {
2062         read_eb_member(eb, bi, struct btrfs_balance_item, sys, ba);
2063 }
2064 
2065 static inline void btrfs_set_balance_sys(struct extent_buffer *eb,
2066                                  struct btrfs_balance_item *bi,
2067                                  const struct btrfs_disk_balance_args *ba)
2068 {
2069         write_eb_member(eb, bi, struct btrfs_balance_item, sys, ba);
2070 }
2071 
2072 static inline void
2073 btrfs_disk_balance_args_to_cpu(struct btrfs_balance_args *cpu,
2074                                const struct btrfs_disk_balance_args *disk)
2075 {
2076         memset(cpu, 0, sizeof(*cpu));
2077 
2078         cpu->profiles = le64_to_cpu(disk->profiles);
2079         cpu->usage = le64_to_cpu(disk->usage);
2080         cpu->devid = le64_to_cpu(disk->devid);
2081         cpu->pstart = le64_to_cpu(disk->pstart);
2082         cpu->pend = le64_to_cpu(disk->pend);
2083         cpu->vstart = le64_to_cpu(disk->vstart);
2084         cpu->vend = le64_to_cpu(disk->vend);
2085         cpu->target = le64_to_cpu(disk->target);
2086         cpu->flags = le64_to_cpu(disk->flags);
2087         cpu->limit = le64_to_cpu(disk->limit);
2088         cpu->stripes_min = le32_to_cpu(disk->stripes_min);
2089         cpu->stripes_max = le32_to_cpu(disk->stripes_max);
2090 }
2091 
2092 static inline void
2093 btrfs_cpu_balance_args_to_disk(struct btrfs_disk_balance_args *disk,
2094                                const struct btrfs_balance_args *cpu)
2095 {
2096         memset(disk, 0, sizeof(*disk));
2097 
2098         disk->profiles = cpu_to_le64(cpu->profiles);
2099         disk->usage = cpu_to_le64(cpu->usage);
2100         disk->devid = cpu_to_le64(cpu->devid);
2101         disk->pstart = cpu_to_le64(cpu->pstart);
2102         disk->pend = cpu_to_le64(cpu->pend);
2103         disk->vstart = cpu_to_le64(cpu->vstart);
2104         disk->vend = cpu_to_le64(cpu->vend);
2105         disk->target = cpu_to_le64(cpu->target);
2106         disk->flags = cpu_to_le64(cpu->flags);
2107         disk->limit = cpu_to_le64(cpu->limit);
2108         disk->stripes_min = cpu_to_le32(cpu->stripes_min);
2109         disk->stripes_max = cpu_to_le32(cpu->stripes_max);
2110 }
2111 
2112 /* struct btrfs_super_block */
2113 BTRFS_SETGET_STACK_FUNCS(super_bytenr, struct btrfs_super_block, bytenr, 64);
2114 BTRFS_SETGET_STACK_FUNCS(super_flags, struct btrfs_super_block, flags, 64);
2115 BTRFS_SETGET_STACK_FUNCS(super_generation, struct btrfs_super_block,
2116                          generation, 64);
2117 BTRFS_SETGET_STACK_FUNCS(super_root, struct btrfs_super_block, root, 64);
2118 BTRFS_SETGET_STACK_FUNCS(super_sys_array_size,
2119                          struct btrfs_super_block, sys_chunk_array_size, 32);
2120 BTRFS_SETGET_STACK_FUNCS(super_chunk_root_generation,
2121                          struct btrfs_super_block, chunk_root_generation, 64);
2122 BTRFS_SETGET_STACK_FUNCS(super_root_level, struct btrfs_super_block,
2123                          root_level, 8);
2124 BTRFS_SETGET_STACK_FUNCS(super_chunk_root, struct btrfs_super_block,
2125                          chunk_root, 64);
2126 BTRFS_SETGET_STACK_FUNCS(super_chunk_root_level, struct btrfs_super_block,
2127                          chunk_root_level, 8);
2128 BTRFS_SETGET_STACK_FUNCS(super_log_root, struct btrfs_super_block,
2129                          log_root, 64);
2130 BTRFS_SETGET_STACK_FUNCS(super_log_root_transid, struct btrfs_super_block,
2131                          log_root_transid, 64);
2132 BTRFS_SETGET_STACK_FUNCS(super_log_root_level, struct btrfs_super_block,
2133                          log_root_level, 8);
2134 BTRFS_SETGET_STACK_FUNCS(super_total_bytes, struct btrfs_super_block,
2135                          total_bytes, 64);
2136 BTRFS_SETGET_STACK_FUNCS(super_bytes_used, struct btrfs_super_block,
2137                          bytes_used, 64);
2138 BTRFS_SETGET_STACK_FUNCS(super_sectorsize, struct btrfs_super_block,
2139                          sectorsize, 32);
2140 BTRFS_SETGET_STACK_FUNCS(super_nodesize, struct btrfs_super_block,
2141                          nodesize, 32);
2142 BTRFS_SETGET_STACK_FUNCS(super_stripesize, struct btrfs_super_block,
2143                          stripesize, 32);
2144 BTRFS_SETGET_STACK_FUNCS(super_root_dir, struct btrfs_super_block,
2145                          root_dir_objectid, 64);
2146 BTRFS_SETGET_STACK_FUNCS(super_num_devices, struct btrfs_super_block,
2147                          num_devices, 64);
2148 BTRFS_SETGET_STACK_FUNCS(super_compat_flags, struct btrfs_super_block,
2149                          compat_flags, 64);
2150 BTRFS_SETGET_STACK_FUNCS(super_compat_ro_flags, struct btrfs_super_block,
2151                          compat_ro_flags, 64);
2152 BTRFS_SETGET_STACK_FUNCS(super_incompat_flags, struct btrfs_super_block,
2153                          incompat_flags, 64);
2154 BTRFS_SETGET_STACK_FUNCS(super_csum_type, struct btrfs_super_block,
2155                          csum_type, 16);
2156 BTRFS_SETGET_STACK_FUNCS(super_cache_generation, struct btrfs_super_block,
2157                          cache_generation, 64);
2158 BTRFS_SETGET_STACK_FUNCS(super_magic, struct btrfs_super_block, magic, 64);
2159 BTRFS_SETGET_STACK_FUNCS(super_uuid_tree_generation, struct btrfs_super_block,
2160                          uuid_tree_generation, 64);
2161 
2162 int btrfs_super_csum_size(const struct btrfs_super_block *s);
2163 const char *btrfs_super_csum_name(u16 csum_type);
2164 
2165 /*
2166  * The leaf data grows from end-to-front in the node.
2167  * this returns the address of the start of the last item,
2168  * which is the stop of the leaf data stack
2169  */
2170 static inline unsigned int leaf_data_end(const struct extent_buffer *leaf)
2171 {
2172         u32 nr = btrfs_header_nritems(leaf);
2173 
2174         if (nr == 0)
2175                 return BTRFS_LEAF_DATA_SIZE(leaf->fs_info);
2176         return btrfs_item_offset_nr(leaf, nr - 1);
2177 }
2178 
2179 /* struct btrfs_file_extent_item */
2180 BTRFS_SETGET_FUNCS(file_extent_type, struct btrfs_file_extent_item, type, 8);
2181 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_disk_bytenr,
2182                          struct btrfs_file_extent_item, disk_bytenr, 64);
2183 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_offset,
2184                          struct btrfs_file_extent_item, offset, 64);
2185 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_generation,
2186                          struct btrfs_file_extent_item, generation, 64);
2187 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_num_bytes,
2188                          struct btrfs_file_extent_item, num_bytes, 64);
2189 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_disk_num_bytes,
2190                          struct btrfs_file_extent_item, disk_num_bytes, 64);
2191 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_compression,
2192                          struct btrfs_file_extent_item, compression, 8);
2193 
2194 static inline unsigned long
2195 btrfs_file_extent_inline_start(const struct btrfs_file_extent_item *e)
2196 {
2197         return (unsigned long)e + BTRFS_FILE_EXTENT_INLINE_DATA_START;
2198 }
2199 
2200 static inline u32 btrfs_file_extent_calc_inline_size(u32 datasize)
2201 {
2202         return BTRFS_FILE_EXTENT_INLINE_DATA_START + datasize;
2203 }
2204 
2205 BTRFS_SETGET_FUNCS(file_extent_disk_bytenr, struct btrfs_file_extent_item,
2206                    disk_bytenr, 64);
2207 BTRFS_SETGET_FUNCS(file_extent_generation, struct btrfs_file_extent_item,
2208                    generation, 64);
2209 BTRFS_SETGET_FUNCS(file_extent_disk_num_bytes, struct btrfs_file_extent_item,
2210                    disk_num_bytes, 64);
2211 BTRFS_SETGET_FUNCS(file_extent_offset, struct btrfs_file_extent_item,
2212                   offset, 64);
2213 BTRFS_SETGET_FUNCS(file_extent_num_bytes, struct btrfs_file_extent_item,
2214                    num_bytes, 64);
2215 BTRFS_SETGET_FUNCS(file_extent_ram_bytes, struct btrfs_file_extent_item,
2216                    ram_bytes, 64);
2217 BTRFS_SETGET_FUNCS(file_extent_compression, struct btrfs_file_extent_item,
2218                    compression, 8);
2219 BTRFS_SETGET_FUNCS(file_extent_encryption, struct btrfs_file_extent_item,
2220                    encryption, 8);
2221 BTRFS_SETGET_FUNCS(file_extent_other_encoding, struct btrfs_file_extent_item,
2222                    other_encoding, 16);
2223 
2224 /*
2225  * this returns the number of bytes used by the item on disk, minus the
2226  * size of any extent headers.  If a file is compressed on disk, this is
2227  * the compressed size
2228  */
2229 static inline u32 btrfs_file_extent_inline_item_len(
2230                                                 const struct extent_buffer *eb,
2231                                                 struct btrfs_item *e)
2232 {
2233         return btrfs_item_size(eb, e) - BTRFS_FILE_EXTENT_INLINE_DATA_START;
2234 }
2235 
2236 /* btrfs_qgroup_status_item */
2237 BTRFS_SETGET_FUNCS(qgroup_status_generation, struct btrfs_qgroup_status_item,
2238                    generation, 64);
2239 BTRFS_SETGET_FUNCS(qgroup_status_version, struct btrfs_qgroup_status_item,
2240                    version, 64);
2241 BTRFS_SETGET_FUNCS(qgroup_status_flags, struct btrfs_qgroup_status_item,
2242                    flags, 64);
2243 BTRFS_SETGET_FUNCS(qgroup_status_rescan, struct btrfs_qgroup_status_item,
2244                    rescan, 64);
2245 
2246 /* btrfs_qgroup_info_item */
2247 BTRFS_SETGET_FUNCS(qgroup_info_generation, struct btrfs_qgroup_info_item,
2248                    generation, 64);
2249 BTRFS_SETGET_FUNCS(qgroup_info_rfer, struct btrfs_qgroup_info_item, rfer, 64);
2250 BTRFS_SETGET_FUNCS(qgroup_info_rfer_cmpr, struct btrfs_qgroup_info_item,
2251                    rfer_cmpr, 64);
2252 BTRFS_SETGET_FUNCS(qgroup_info_excl, struct btrfs_qgroup_info_item, excl, 64);
2253 BTRFS_SETGET_FUNCS(qgroup_info_excl_cmpr, struct btrfs_qgroup_info_item,
2254                    excl_cmpr, 64);
2255 
2256 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_generation,
2257                          struct btrfs_qgroup_info_item, generation, 64);
2258 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_rfer, struct btrfs_qgroup_info_item,
2259                          rfer, 64);
2260 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_rfer_cmpr,
2261                          struct btrfs_qgroup_info_item, rfer_cmpr, 64);
2262 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_excl, struct btrfs_qgroup_info_item,
2263                          excl, 64);
2264 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_excl_cmpr,
2265                          struct btrfs_qgroup_info_item, excl_cmpr, 64);
2266 
2267 /* btrfs_qgroup_limit_item */
2268 BTRFS_SETGET_FUNCS(qgroup_limit_flags, struct btrfs_qgroup_limit_item,
2269                    flags, 64);
2270 BTRFS_SETGET_FUNCS(qgroup_limit_max_rfer, struct btrfs_qgroup_limit_item,
2271                    max_rfer, 64);
2272 BTRFS_SETGET_FUNCS(qgroup_limit_max_excl, struct btrfs_qgroup_limit_item,
2273                    max_excl, 64);
2274 BTRFS_SETGET_FUNCS(qgroup_limit_rsv_rfer, struct btrfs_qgroup_limit_item,
2275                    rsv_rfer, 64);
2276 BTRFS_SETGET_FUNCS(qgroup_limit_rsv_excl, struct btrfs_qgroup_limit_item,
2277                    rsv_excl, 64);
2278 
2279 /* btrfs_dev_replace_item */
2280 BTRFS_SETGET_FUNCS(dev_replace_src_devid,
2281                    struct btrfs_dev_replace_item, src_devid, 64);
2282 BTRFS_SETGET_FUNCS(dev_replace_cont_reading_from_srcdev_mode,
2283                    struct btrfs_dev_replace_item, cont_reading_from_srcdev_mode,
2284                    64);
2285 BTRFS_SETGET_FUNCS(dev_replace_replace_state, struct btrfs_dev_replace_item,
2286                    replace_state, 64);
2287 BTRFS_SETGET_FUNCS(dev_replace_time_started, struct btrfs_dev_replace_item,
2288                    time_started, 64);
2289 BTRFS_SETGET_FUNCS(dev_replace_time_stopped, struct btrfs_dev_replace_item,
2290                    time_stopped, 64);
2291 BTRFS_SETGET_FUNCS(dev_replace_num_write_errors, struct btrfs_dev_replace_item,
2292                    num_write_errors, 64);
2293 BTRFS_SETGET_FUNCS(dev_replace_num_uncorrectable_read_errors,
2294                    struct btrfs_dev_replace_item, num_uncorrectable_read_errors,
2295                    64);
2296 BTRFS_SETGET_FUNCS(dev_replace_cursor_left, struct btrfs_dev_replace_item,
2297                    cursor_left, 64);
2298 BTRFS_SETGET_FUNCS(dev_replace_cursor_right, struct btrfs_dev_replace_item,
2299                    cursor_right, 64);
2300 
2301 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_src_devid,
2302                          struct btrfs_dev_replace_item, src_devid, 64);
2303 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_cont_reading_from_srcdev_mode,
2304                          struct btrfs_dev_replace_item,
2305                          cont_reading_from_srcdev_mode, 64);
2306 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_replace_state,
2307                          struct btrfs_dev_replace_item, replace_state, 64);
2308 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_time_started,
2309                          struct btrfs_dev_replace_item, time_started, 64);
2310 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_time_stopped,
2311                          struct btrfs_dev_replace_item, time_stopped, 64);
2312 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_num_write_errors,
2313                          struct btrfs_dev_replace_item, num_write_errors, 64);
2314 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_num_uncorrectable_read_errors,
2315                          struct btrfs_dev_replace_item,
2316                          num_uncorrectable_read_errors, 64);
2317 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_cursor_left,
2318                          struct btrfs_dev_replace_item, cursor_left, 64);
2319 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_cursor_right,
2320                          struct btrfs_dev_replace_item, cursor_right, 64);
2321 
2322 /* helper function to cast into the data area of the leaf. */
2323 #define btrfs_item_ptr(leaf, slot, type) \
2324         ((type *)(BTRFS_LEAF_DATA_OFFSET + \
2325         btrfs_item_offset_nr(leaf, slot)))
2326 
2327 #define btrfs_item_ptr_offset(leaf, slot) \
2328         ((unsigned long)(BTRFS_LEAF_DATA_OFFSET + \
2329         btrfs_item_offset_nr(leaf, slot)))
2330 
2331 static inline u32 btrfs_crc32c(u32 crc, const void *address, unsigned length)
2332 {
2333         return crc32c(crc, address, length);
2334 }
2335 
2336 static inline void btrfs_crc32c_final(u32 crc, u8 *result)
2337 {
2338         put_unaligned_le32(~crc, result);
2339 }
2340 
2341 static inline u64 btrfs_name_hash(const char *name, int len)
2342 {
2343        return crc32c((u32)~1, name, len);
2344 }
2345 
2346 /*
2347  * Figure the key offset of an extended inode ref
2348  */
2349 static inline u64 btrfs_extref_hash(u64 parent_objectid, const char *name,
2350                                    int len)
2351 {
2352        return (u64) crc32c(parent_objectid, name, len);
2353 }
2354 
2355 static inline gfp_t btrfs_alloc_write_mask(struct address_space *mapping)
2356 {
2357         return mapping_gfp_constraint(mapping, ~__GFP_FS);
2358 }
2359 
2360 /* extent-tree.c */
2361 
2362 enum btrfs_inline_ref_type {
2363         BTRFS_REF_TYPE_INVALID,
2364         BTRFS_REF_TYPE_BLOCK,
2365         BTRFS_REF_TYPE_DATA,
2366         BTRFS_REF_TYPE_ANY,
2367 };
2368 
2369 int btrfs_get_extent_inline_ref_type(const struct extent_buffer *eb,
2370                                      struct btrfs_extent_inline_ref *iref,
2371                                      enum btrfs_inline_ref_type is_data);
2372 u64 hash_extent_data_ref(u64 root_objectid, u64 owner, u64 offset);
2373 
2374 u64 btrfs_csum_bytes_to_leaves(struct btrfs_fs_info *fs_info, u64 csum_bytes);
2375 
2376 /*
2377  * Use this if we would be adding new items, as we could split nodes as we cow
2378  * down the tree.
2379  */
2380 static inline u64 btrfs_calc_insert_metadata_size(struct btrfs_fs_info *fs_info,
2381                                                   unsigned num_items)
2382 {
2383         return (u64)fs_info->nodesize * BTRFS_MAX_LEVEL * 2 * num_items;
2384 }
2385 
2386 /*
2387  * Doing a truncate or a modification won't result in new nodes or leaves, just
2388  * what we need for COW.
2389  */
2390 static inline u64 btrfs_calc_metadata_size(struct btrfs_fs_info *fs_info,
2391                                                  unsigned num_items)
2392 {
2393         return (u64)fs_info->nodesize * BTRFS_MAX_LEVEL * num_items;
2394 }
2395 
2396 int btrfs_add_excluded_extent(struct btrfs_fs_info *fs_info,
2397                               u64 start, u64 num_bytes);
2398 void btrfs_free_excluded_extents(struct btrfs_block_group_cache *cache);
2399 int btrfs_run_delayed_refs(struct btrfs_trans_handle *trans,
2400                            unsigned long count);
2401 void btrfs_cleanup_ref_head_accounting(struct btrfs_fs_info *fs_info,
2402                                   struct btrfs_delayed_ref_root *delayed_refs,
2403                                   struct btrfs_delayed_ref_head *head);
2404 int btrfs_lookup_data_extent(struct btrfs_fs_info *fs_info, u64 start, u64 len);
2405 int btrfs_lookup_extent_info(struct btrfs_trans_handle *trans,
2406                              struct btrfs_fs_info *fs_info, u64 bytenr,
2407                              u64 offset, int metadata, u64 *refs, u64 *flags);
2408 int btrfs_pin_extent(struct btrfs_fs_info *fs_info,
2409                      u64 bytenr, u64 num, int reserved);
2410 int btrfs_pin_extent_for_log_replay(struct btrfs_fs_info *fs_info,
2411                                     u64 bytenr, u64 num_bytes);
2412 int btrfs_exclude_logged_extents(struct extent_buffer *eb);
2413 int btrfs_cross_ref_exist(struct btrfs_root *root,
2414                           u64 objectid, u64 offset, u64 bytenr);
2415 struct extent_buffer *btrfs_alloc_tree_block(struct btrfs_trans_handle *trans,
2416                                              struct btrfs_root *root,
2417                                              u64 parent, u64 root_objectid,
2418                                              const struct btrfs_disk_key *key,
2419                                              int level, u64 hint,
2420                                              u64 empty_size);
2421 void btrfs_free_tree_block(struct btrfs_trans_handle *trans,
2422                            struct btrfs_root *root,
2423                            struct extent_buffer *buf,
2424                            u64 parent, int last_ref);
2425 int btrfs_alloc_reserved_file_extent(struct btrfs_trans_handle *trans,
2426                                      struct btrfs_root *root, u64 owner,
2427                                      u64 offset, u64 ram_bytes,
2428                                      struct btrfs_key *ins);
2429 int btrfs_alloc_logged_file_extent(struct btrfs_trans_handle *trans,
2430                                    u64 root_objectid, u64 owner, u64 offset,
2431                                    struct btrfs_key *ins);
2432 int btrfs_reserve_extent(struct btrfs_root *root, u64 ram_bytes, u64 num_bytes,
2433                          u64 min_alloc_size, u64 empty_size, u64 hint_byte,
2434                          struct btrfs_key *ins, int is_data, int delalloc);
2435 int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2436                   struct extent_buffer *buf, int full_backref);
2437 int btrfs_dec_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2438                   struct extent_buffer *buf, int full_backref);
2439 int btrfs_set_disk_extent_flags(struct btrfs_trans_handle *trans,
2440                                 u64 bytenr, u64 num_bytes, u64 flags,
2441                                 int level, int is_data);
2442 int btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_ref *ref);
2443 
2444 int btrfs_free_reserved_extent(struct btrfs_fs_info *fs_info,
2445                                u64 start, u64 len, int delalloc);
2446 int btrfs_free_and_pin_reserved_extent(struct btrfs_fs_info *fs_info,
2447                                        u64 start, u64 len);
2448 void btrfs_prepare_extent_commit(struct btrfs_fs_info *fs_info);
2449 int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans);
2450 int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
2451                          struct btrfs_ref *generic_ref);
2452 
2453 int btrfs_extent_readonly(struct btrfs_fs_info *fs_info, u64 bytenr);
2454 void btrfs_get_block_group_trimming(struct btrfs_block_group_cache *cache);
2455 void btrfs_put_block_group_trimming(struct btrfs_block_group_cache *cache);
2456 void btrfs_clear_space_info_full(struct btrfs_fs_info *info);
2457 
2458 enum btrfs_reserve_flush_enum {
2459         /* If we are in the transaction, we can't flush anything.*/
2460         BTRFS_RESERVE_NO_FLUSH,
2461         /*
2462          * Flushing delalloc may cause deadlock somewhere, in this
2463          * case, use FLUSH LIMIT
2464          */
2465         BTRFS_RESERVE_FLUSH_LIMIT,
2466         BTRFS_RESERVE_FLUSH_EVICT,
2467         BTRFS_RESERVE_FLUSH_ALL,
2468 };
2469 
2470 enum btrfs_flush_state {
2471         FLUSH_DELAYED_ITEMS_NR  =       1,
2472         FLUSH_DELAYED_ITEMS     =       2,
2473         FLUSH_DELAYED_REFS_NR   =       3,
2474         FLUSH_DELAYED_REFS      =       4,
2475         FLUSH_DELALLOC          =       5,
2476         FLUSH_DELALLOC_WAIT     =       6,
2477         ALLOC_CHUNK             =       7,
2478         ALLOC_CHUNK_FORCE       =       8,
2479         RUN_DELAYED_IPUTS       =       9,
2480         COMMIT_TRANS            =       10,
2481 };
2482 
2483 int btrfs_subvolume_reserve_metadata(struct btrfs_root *root,
2484                                      struct btrfs_block_rsv *rsv,
2485                                      int nitems, bool use_global_rsv);
2486 void btrfs_subvolume_release_metadata(struct btrfs_fs_info *fs_info,
2487                                       struct btrfs_block_rsv *rsv);
2488 void btrfs_delalloc_release_extents(struct btrfs_inode *inode, u64 num_bytes);
2489 
2490 int btrfs_delalloc_reserve_metadata(struct btrfs_inode *inode, u64 num_bytes);
2491 u64 btrfs_account_ro_block_groups_free_space(struct btrfs_space_info *sinfo);
2492 int btrfs_error_unpin_extent_range(struct btrfs_fs_info *fs_info,
2493                                    u64 start, u64 end);
2494 int btrfs_discard_extent(struct btrfs_fs_info *fs_info, u64 bytenr,
2495                          u64 num_bytes, u64 *actual_bytes);
2496 int btrfs_trim_fs(struct btrfs_fs_info *fs_info, struct fstrim_range *range);
2497 
2498 int btrfs_init_space_info(struct btrfs_fs_info *fs_info);
2499 int btrfs_delayed_refs_qgroup_accounting(struct btrfs_trans_handle *trans,
2500                                          struct btrfs_fs_info *fs_info);
2501 int btrfs_start_write_no_snapshotting(struct btrfs_root *root);
2502 void btrfs_end_write_no_snapshotting(struct btrfs_root *root);
2503 void btrfs_wait_for_snapshot_creation(struct btrfs_root *root);
2504 
2505 /* ctree.c */
2506 int btrfs_bin_search(struct extent_buffer *eb, const struct btrfs_key *key,
2507                      int level, int *slot);
2508 int btrfs_comp_cpu_keys(const struct btrfs_key *k1, const struct btrfs_key *k2);
2509 int btrfs_previous_item(struct btrfs_root *root,
2510                         struct btrfs_path *path, u64 min_objectid,
2511                         int type);
2512 int btrfs_previous_extent_item(struct btrfs_root *root,
2513                         struct btrfs_path *path, u64 min_objectid);
2514 void btrfs_set_item_key_safe(struct btrfs_fs_info *fs_info,
2515                              struct btrfs_path *path,
2516                              const struct btrfs_key *new_key);
2517 struct extent_buffer *btrfs_root_node(struct btrfs_root *root);
2518 struct extent_buffer *btrfs_lock_root_node(struct btrfs_root *root);
2519 struct extent_buffer *btrfs_read_lock_root_node(struct btrfs_root *root);
2520 int btrfs_find_next_key(struct btrfs_root *root, struct btrfs_path *path,
2521                         struct btrfs_key *key, int lowest_level,
2522                         u64 min_trans);
2523 int btrfs_search_forward(struct btrfs_root *root, struct btrfs_key *min_key,
2524                          struct btrfs_path *path,
2525                          u64 min_trans);
2526 struct extent_buffer *btrfs_read_node_slot(struct extent_buffer *parent,
2527                                            int slot);
2528 
2529 int btrfs_cow_block(struct btrfs_trans_handle *trans,
2530                     struct btrfs_root *root, struct extent_buffer *buf,
2531                     struct extent_buffer *parent, int parent_slot,
2532                     struct extent_buffer **cow_ret);
2533 int btrfs_copy_root(struct btrfs_trans_handle *trans,
2534                       struct btrfs_root *root,
2535                       struct extent_buffer *buf,
2536                       struct extent_buffer **cow_ret, u64 new_root_objectid);
2537 int btrfs_block_can_be_shared(struct btrfs_root *root,
2538                               struct extent_buffer *buf);
2539 void btrfs_extend_item(struct btrfs_path *path, u32 data_size);
2540 void btrfs_truncate_item(struct btrfs_path *path, u32 new_size, int from_end);
2541 int btrfs_split_item(struct btrfs_trans_handle *trans,
2542                      struct btrfs_root *root,
2543                      struct btrfs_path *path,
2544                      const struct btrfs_key *new_key,
2545                      unsigned long split_offset);
2546 int btrfs_duplicate_item(struct btrfs_trans_handle *trans,
2547                          struct btrfs_root *root,
2548                          struct btrfs_path *path,
2549                          const struct btrfs_key *new_key);
2550 int btrfs_find_item(struct btrfs_root *fs_root, struct btrfs_path *path,
2551                 u64 inum, u64 ioff, u8 key_type, struct btrfs_key *found_key);
2552 int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2553                       const struct btrfs_key *key, struct btrfs_path *p,
2554                       int ins_len, int cow);
2555 int btrfs_search_old_slot(struct btrfs_root *root, const struct btrfs_key *key,
2556                           struct btrfs_path *p, u64 time_seq);
2557 int btrfs_search_slot_for_read(struct btrfs_root *root,
2558                                const struct btrfs_key *key,
2559                                struct btrfs_path *p, int find_higher,
2560                                int return_any);
2561 int btrfs_realloc_node(struct btrfs_trans_handle *trans,
2562                        struct btrfs_root *root, struct extent_buffer *parent,
2563                        int start_slot, u64 *last_ret,
2564                        struct btrfs_key *progress);
2565 void btrfs_release_path(struct btrfs_path *p);
2566 struct btrfs_path *btrfs_alloc_path(void);
2567 void btrfs_free_path(struct btrfs_path *p);
2568 void btrfs_set_path_blocking(struct btrfs_path *p);
2569 void btrfs_unlock_up_safe(struct btrfs_path *p, int level);
2570 
2571 int btrfs_del_items(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2572                    struct btrfs_path *path, int slot, int nr);
2573 static inline int btrfs_del_item(struct btrfs_trans_handle *trans,
2574                                  struct btrfs_root *root,
2575                                  struct btrfs_path *path)
2576 {
2577         return btrfs_del_items(trans, root, path, path->slots[0], 1);
2578 }
2579 
2580 void setup_items_for_insert(struct btrfs_root *root, struct btrfs_path *path,
2581                             const struct btrfs_key *cpu_key, u32 *data_size,
2582                             u32 total_data, u32 total_size, int nr);
2583 int btrfs_insert_item(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2584                       const struct btrfs_key *key, void *data, u32 data_size);
2585 int btrfs_insert_empty_items(struct btrfs_trans_handle *trans,
2586                              struct btrfs_root *root,
2587                              struct btrfs_path *path,
2588                              const struct btrfs_key *cpu_key, u32 *data_size,
2589                              int nr);
2590 
2591 static inline int btrfs_insert_empty_item(struct btrfs_trans_handle *trans,
2592                                           struct btrfs_root *root,
2593                                           struct btrfs_path *path,
2594                                           const struct btrfs_key *key,
2595                                           u32 data_size)
2596 {
2597         return btrfs_insert_empty_items(trans, root, path, key, &data_size, 1);
2598 }
2599 
2600 int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path);
2601 int btrfs_prev_leaf(struct btrfs_root *root, struct btrfs_path *path);
2602 int btrfs_next_old_leaf(struct btrfs_root *root, struct btrfs_path *path,
2603                         u64 time_seq);
2604 static inline int btrfs_next_old_item(struct btrfs_root *root,
2605                                       struct btrfs_path *p, u64 time_seq)
2606 {
2607         ++p->slots[0];
2608         if (p->slots[0] >= btrfs_header_nritems(p->nodes[0]))
2609                 return btrfs_next_old_leaf(root, p, time_seq);
2610         return 0;
2611 }
2612 static inline int btrfs_next_item(struct btrfs_root *root, struct btrfs_path *p)
2613 {
2614         return btrfs_next_old_item(root, p, 0);
2615 }
2616 int btrfs_leaf_free_space(struct extent_buffer *leaf);
2617 int __must_check btrfs_drop_snapshot(struct btrfs_root *root,
2618                                      struct btrfs_block_rsv *block_rsv,
2619                                      int update_ref, int for_reloc);
2620 int btrfs_drop_subtree(struct btrfs_trans_handle *trans,
2621                         struct btrfs_root *root,
2622                         struct extent_buffer *node,
2623                         struct extent_buffer *parent);
2624 static inline int btrfs_fs_closing(struct btrfs_fs_info *fs_info)
2625 {
2626         /*
2627          * Do it this way so we only ever do one test_bit in the normal case.
2628          */
2629         if (test_bit(BTRFS_FS_CLOSING_START, &fs_info->flags)) {
2630                 if (test_bit(BTRFS_FS_CLOSING_DONE, &fs_info->flags))
2631                         return 2;
2632                 return 1;
2633         }
2634         return 0;
2635 }
2636 
2637 /*
2638  * If we remount the fs to be R/O or umount the fs, the cleaner needn't do
2639  * anything except sleeping. This function is used to check the status of
2640  * the fs.
2641  */
2642 static inline int btrfs_need_cleaner_sleep(struct btrfs_fs_info *fs_info)
2643 {
2644         return fs_info->sb->s_flags & SB_RDONLY || btrfs_fs_closing(fs_info);
2645 }
2646 
2647 static inline void free_fs_info(struct btrfs_fs_info *fs_info)
2648 {
2649         kfree(fs_info->balance_ctl);
2650         kfree(fs_info->delayed_root);
2651         kfree(fs_info->extent_root);
2652         kfree(fs_info->tree_root);
2653         kfree(fs_info->chunk_root);
2654         kfree(fs_info->dev_root);
2655         kfree(fs_info->csum_root);
2656         kfree(fs_info->quota_root);
2657         kfree(fs_info->uuid_root);
2658         kfree(fs_info->free_space_root);
2659         kfree(fs_info->super_copy);
2660         kfree(fs_info->super_for_commit);
2661         kvfree(fs_info);
2662 }
2663 
2664 /* tree mod log functions from ctree.c */
2665 u64 btrfs_get_tree_mod_seq(struct btrfs_fs_info *fs_info,
2666                            struct seq_list *elem);
2667 void btrfs_put_tree_mod_seq(struct btrfs_fs_info *fs_info,
2668                             struct seq_list *elem);
2669 int btrfs_old_root_level(struct btrfs_root *root, u64 time_seq);
2670 
2671 /* root-item.c */
2672 int btrfs_add_root_ref(struct btrfs_trans_handle *trans, u64 root_id,
2673                        u64 ref_id, u64 dirid, u64 sequence, const char *name,
2674                        int name_len);
2675 int btrfs_del_root_ref(struct btrfs_trans_handle *trans, u64 root_id,
2676                        u64 ref_id, u64 dirid, u64 *sequence, const char *name,
2677                        int name_len);
2678 int btrfs_del_root(struct btrfs_trans_handle *trans,
2679                    const struct btrfs_key *key);
2680 int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2681                       const struct btrfs_key *key,
2682                       struct btrfs_root_item *item);
2683 int __must_check btrfs_update_root(struct btrfs_trans_handle *trans,
2684                                    struct btrfs_root *root,
2685                                    struct btrfs_key *key,
2686                                    struct btrfs_root_item *item);
2687 int btrfs_find_root(struct btrfs_root *root, const struct btrfs_key *search_key,
2688                     struct btrfs_path *path, struct btrfs_root_item *root_item,
2689                     struct btrfs_key *root_key);
2690 int btrfs_find_orphan_roots(struct btrfs_fs_info *fs_info);
2691 void btrfs_set_root_node(struct btrfs_root_item *item,
2692                          struct extent_buffer *node);
2693 void btrfs_check_and_init_root_item(struct btrfs_root_item *item);
2694 void btrfs_update_root_times(struct btrfs_trans_handle *trans,
2695                              struct btrfs_root *root);
2696 
2697 /* uuid-tree.c */
2698 int btrfs_uuid_tree_add(struct btrfs_trans_handle *trans, u8 *uuid, u8 type,
2699                         u64 subid);
2700 int btrfs_uuid_tree_remove(struct btrfs_trans_handle *trans, u8 *uuid, u8 type,
2701                         u64 subid);
2702 int btrfs_uuid_tree_iterate(struct btrfs_fs_info *fs_info,
2703                             int (*check_func)(struct btrfs_fs_info *, u8 *, u8,
2704                                               u64));
2705 
2706 /* dir-item.c */
2707 int btrfs_check_dir_item_collision(struct btrfs_root *root, u64 dir,
2708                           const char *name, int name_len);
2709 int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, const char *name,
2710                           int name_len, struct btrfs_inode *dir,
2711                           struct btrfs_key *location, u8 type, u64 index);
2712 struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans,
2713                                              struct btrfs_root *root,
2714                                              struct btrfs_path *path, u64 dir,
2715                                              const char *name, int name_len,
2716                                              int mod);
2717 struct btrfs_dir_item *
2718 btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans,
2719                             struct btrfs_root *root,
2720                             struct btrfs_path *path, u64 dir,
2721                             u64 objectid, const char *name, int name_len,
2722                             int mod);
2723 struct btrfs_dir_item *
2724 btrfs_search_dir_index_item(struct btrfs_root *root,
2725                             struct btrfs_path *path, u64 dirid,
2726                             const char *name, int name_len);
2727 int btrfs_delete_one_dir_name(struct btrfs_trans_handle *trans,
2728                               struct btrfs_root *root,
2729                               struct btrfs_path *path,
2730                               struct btrfs_dir_item *di);
2731 int btrfs_insert_xattr_item(struct btrfs_trans_handle *trans,
2732                             struct btrfs_root *root,
2733                             struct btrfs_path *path, u64 objectid,
2734                             const char *name, u16 name_len,
2735                             const void *data, u16 data_len);
2736 struct btrfs_dir_item *btrfs_lookup_xattr(struct btrfs_trans_handle *trans,
2737                                           struct btrfs_root *root,
2738                                           struct btrfs_path *path, u64 dir,
2739                                           const char *name, u16 name_len,
2740                                           int mod);
2741 struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_fs_info *fs_info,
2742                                                  struct btrfs_path *path,
2743                                                  const char *name,
2744                                                  int name_len);
2745 
2746 /* orphan.c */
2747 int btrfs_insert_orphan_item(struct btrfs_trans_handle *trans,
2748                              struct btrfs_root *root, u64 offset);
2749 int btrfs_del_orphan_item(struct btrfs_trans_handle *trans,
2750                           struct btrfs_root *root, u64 offset);
2751 int btrfs_find_orphan_item(struct btrfs_root *root, u64 offset);
2752 
2753 /* inode-item.c */
2754 int btrfs_insert_inode_ref(struct btrfs_trans_handle *trans,
2755                            struct btrfs_root *root,
2756                            const char *name, int name_len,
2757                            u64 inode_objectid, u64 ref_objectid, u64 index);
2758 int btrfs_del_inode_ref(struct btrfs_trans_handle *trans,
2759                            struct btrfs_root *root,
2760                            const char *name, int name_len,
2761                            u64 inode_objectid, u64 ref_objectid, u64 *index);
2762 int btrfs_insert_empty_inode(struct btrfs_trans_handle *trans,
2763                              struct btrfs_root *root,
2764                              struct btrfs_path *path, u64 objectid);
2765 int btrfs_lookup_inode(struct btrfs_trans_handle *trans, struct btrfs_root
2766                        *root, struct btrfs_path *path,
2767                        struct btrfs_key *location, int mod);
2768 
2769 struct btrfs_inode_extref *
2770 btrfs_lookup_inode_extref(struct btrfs_trans_handle *trans,
2771                           struct btrfs_root *root,
2772                           struct btrfs_path *path,
2773                           const char *name, int name_len,
2774                           u64 inode_objectid, u64 ref_objectid, int ins_len,
2775                           int cow);
2776 
2777 struct btrfs_inode_ref *btrfs_find_name_in_backref(struct extent_buffer *leaf,
2778                                                    int slot, const char *name,
2779                                                    int name_len);
2780 struct btrfs_inode_extref *btrfs_find_name_in_ext_backref(
2781                 struct extent_buffer *leaf, int slot, u64 ref_objectid,
2782                 const char *name, int name_len);
2783 /* file-item.c */
2784 struct btrfs_dio_private;
2785 int btrfs_del_csums(struct btrfs_trans_handle *trans,
2786                     struct btrfs_root *root, u64 bytenr, u64 len);
2787 blk_status_t btrfs_lookup_bio_sums(struct inode *inode, struct bio *bio,
2788                                    u8 *dst);
2789 blk_status_t btrfs_lookup_bio_sums_dio(struct inode *inode, struct bio *bio,
2790                               u64 logical_offset);
2791 int btrfs_insert_file_extent(struct btrfs_trans_handle *trans,
2792                              struct btrfs_root *root,
2793                              u64 objectid, u64 pos,
2794                              u64 disk_offset, u64 disk_num_bytes,
2795                              u64 num_bytes, u64 offset, u64 ram_bytes,
2796                              u8 compression, u8 encryption, u16 other_encoding);
2797 int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
2798                              struct btrfs_root *root,
2799                              struct btrfs_path *path, u64 objectid,
2800                              u64 bytenr, int mod);
2801 int btrfs_csum_file_blocks(struct btrfs_trans_handle *trans,
2802                            struct btrfs_root *root,
2803                            struct btrfs_ordered_sum *sums);
2804 blk_status_t btrfs_csum_one_bio(struct inode *inode, struct bio *bio,
2805                        u64 file_start, int contig);
2806 int btrfs_lookup_csums_range(struct btrfs_root *root, u64 start, u64 end,
2807                              struct list_head *list, int search_commit);
2808 void btrfs_extent_item_to_extent_map(struct btrfs_inode *inode,
2809                                      const struct btrfs_path *path,
2810                                      struct btrfs_file_extent_item *fi,
2811                                      const bool new_inline,
2812                                      struct extent_map *em);
2813 
2814 /* inode.c */
2815 struct extent_map *btrfs_get_extent_fiemap(struct btrfs_inode *inode,
2816                                            u64 start, u64 len);
2817 noinline int can_nocow_extent(struct inode *inode, u64 offset, u64 *len,
2818                               u64 *orig_start, u64 *orig_block_len,
2819                               u64 *ram_bytes);
2820 
2821 void __btrfs_del_delalloc_inode(struct btrfs_root *root,
2822                                 struct btrfs_inode *inode);
2823 struct inode *btrfs_lookup_dentry(struct inode *dir, struct dentry *dentry);
2824 int btrfs_set_inode_index(struct btrfs_inode *dir, u64 *index);
2825 int btrfs_unlink_inode(struct btrfs_trans_handle *trans,
2826                        struct btrfs_root *root,
2827                        struct btrfs_inode *dir, struct btrfs_inode *inode,
2828                        const char *name, int name_len);
2829 int btrfs_add_link(struct btrfs_trans_handle *trans,
2830                    struct btrfs_inode *parent_inode, struct btrfs_inode *inode,
2831                    const char *name, int name_len, int add_backref, u64 index);
2832 int btrfs_delete_subvolume(struct inode *dir, struct dentry *dentry);
2833 int btrfs_truncate_block(struct inode *inode, loff_t from, loff_t len,
2834                         int front);
2835 int btrfs_truncate_inode_items(struct btrfs_trans_handle *trans,
2836                                struct btrfs_root *root,
2837                                struct inode *inode, u64 new_size,
2838                                u32 min_type);
2839 
2840 int btrfs_start_delalloc_snapshot(struct btrfs_root *root);
2841 int btrfs_start_delalloc_roots(struct btrfs_fs_info *fs_info, int nr);
2842 int btrfs_set_extent_delalloc(struct inode *inode, u64 start, u64 end,
2843                               unsigned int extra_bits,
2844                               struct extent_state **cached_state);
2845 int btrfs_create_subvol_root(struct btrfs_trans_handle *trans,
2846                              struct btrfs_root *new_root,
2847                              struct btrfs_root *parent_root,
2848                              u64 new_dirid);
2849  void btrfs_set_delalloc_extent(struct inode *inode, struct extent_state *state,
2850                                unsigned *bits);
2851 void btrfs_clear_delalloc_extent(struct inode *inode,
2852                                  struct extent_state *state, unsigned *bits);
2853 void btrfs_merge_delalloc_extent(struct inode *inode, struct extent_state *new,
2854                                  struct extent_state *other);
2855 void btrfs_split_delalloc_extent(struct inode *inode,
2856                                  struct extent_state *orig, u64 split);
2857 int btrfs_bio_fits_in_stripe(struct page *page, size_t size, struct bio *bio,
2858                              unsigned long bio_flags);
2859 void btrfs_set_range_writeback(struct extent_io_tree *tree, u64 start, u64 end);
2860 vm_fault_t btrfs_page_mkwrite(struct vm_fault *vmf);
2861 int btrfs_readpage(struct file *file, struct page *page);
2862 void btrfs_evict_inode(struct inode *inode);
2863 int btrfs_write_inode(struct inode *inode, struct writeback_control *wbc);
2864 struct inode *btrfs_alloc_inode(struct super_block *sb);
2865 void btrfs_destroy_inode(struct inode *inode);
2866 void btrfs_free_inode(struct inode *inode);
2867 int btrfs_drop_inode(struct inode *inode);
2868 int __init btrfs_init_cachep(void);
2869 void __cold btrfs_destroy_cachep(void);
2870 struct inode *btrfs_iget_path(struct super_block *s, struct btrfs_key *location,
2871                               struct btrfs_root *root, int *new,
2872                               struct btrfs_path *path);
2873 struct inode *btrfs_iget(struct super_block *s, struct btrfs_key *location,
2874                          struct btrfs_root *root, int *was_new);
2875 struct extent_map *btrfs_get_extent(struct btrfs_inode *inode,
2876                                     struct page *page, size_t pg_offset,
2877                                     u64 start, u64 end, int create);
2878 int btrfs_update_inode(struct btrfs_trans_handle *trans,
2879                               struct btrfs_root *root,
2880                               struct inode *inode);
2881 int btrfs_update_inode_fallback(struct btrfs_trans_handle *trans,
2882                                 struct btrfs_root *root, struct inode *inode);
2883 int btrfs_orphan_add(struct btrfs_trans_handle *trans,
2884                 struct btrfs_inode *inode);
2885 int btrfs_orphan_cleanup(struct btrfs_root *root);
2886 int btrfs_cont_expand(struct inode *inode, loff_t oldsize, loff_t size);
2887 void btrfs_add_delayed_iput(struct inode *inode);
2888 void btrfs_run_delayed_iputs(struct btrfs_fs_info *fs_info);
2889 int btrfs_wait_on_delayed_iputs(struct btrfs_fs_info *fs_info);
2890 int btrfs_prealloc_file_range(struct inode *inode, int mode,
2891                               u64 start, u64 num_bytes, u64 min_size,
2892                               loff_t actual_len, u64 *alloc_hint);
2893 int btrfs_prealloc_file_range_trans(struct inode *inode,
2894                                     struct btrfs_trans_handle *trans, int mode,
2895                                     u64 start, u64 num_bytes, u64 min_size,
2896                                     loff_t actual_len, u64 *alloc_hint);
2897 int btrfs_run_delalloc_range(struct inode *inode, struct page *locked_page,
2898                 u64 start, u64 end, int *page_started, unsigned long *nr_written,
2899                 struct writeback_control *wbc);
2900 int btrfs_writepage_cow_fixup(struct page *page, u64 start, u64 end);
2901 void btrfs_writepage_endio_finish_ordered(struct page *page, u64 start,
2902                                           u64 end, int uptodate);
2903 extern const struct dentry_operations btrfs_dentry_operations;
2904 
2905 /* ioctl.c */
2906 long btrfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
2907 long btrfs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
2908 int btrfs_ioctl_get_supported_features(void __user *arg);
2909 void btrfs_sync_inode_flags_to_i_flags(struct inode *inode);
2910 int btrfs_is_empty_uuid(u8 *uuid);
2911 int btrfs_defrag_file(struct inode *inode, struct file *file,
2912                       struct btrfs_ioctl_defrag_range_args *range,
2913                       u64 newer_than, unsigned long max_pages);
2914 void btrfs_get_block_group_info(struct list_head *groups_list,
2915                                 struct btrfs_ioctl_space_info *space);
2916 void btrfs_update_ioctl_balance_args(struct btrfs_fs_info *fs_info,
2917                                struct btrfs_ioctl_balance_args *bargs);
2918 
2919 /* file.c */
2920 int __init btrfs_auto_defrag_init(void);
2921 void __cold btrfs_auto_defrag_exit(void);
2922 int btrfs_add_inode_defrag(struct btrfs_trans_handle *trans,
2923                            struct btrfs_inode *inode);
2924 int btrfs_run_defrag_inodes(struct btrfs_fs_info *fs_info);
2925 void btrfs_cleanup_defrag_inodes(struct btrfs_fs_info *fs_info);
2926 int btrfs_sync_file(struct file *file, loff_t start, loff_t end, int datasync);
2927 void btrfs_drop_extent_cache(struct btrfs_inode *inode, u64 start, u64 end,
2928                              int skip_pinned);
2929 extern const struct file_operations btrfs_file_operations;
2930 int __btrfs_drop_extents(struct btrfs_trans_handle *trans,
2931                          struct btrfs_root *root, struct inode *inode,
2932                          struct btrfs_path *path, u64 start, u64 end,
2933                          u64 *drop_end, int drop_cache,
2934                          int replace_extent,
2935                          u32 extent_item_size,
2936                          int *key_inserted);
2937 int btrfs_drop_extents(struct btrfs_trans_handle *trans,
2938                        struct btrfs_root *root, struct inode *inode, u64 start,
2939                        u64 end, int drop_cache);
2940 int btrfs_punch_hole_range(struct inode *inode, struct btrfs_path *path,
2941                            const u64 start, const u64 end,
2942                            struct btrfs_clone_extent_info *clone_info,
2943                            struct btrfs_trans_handle **trans_out);
2944 int btrfs_mark_extent_written(struct btrfs_trans_handle *trans,
2945                               struct btrfs_inode *inode, u64 start, u64 end);
2946 int btrfs_release_file(struct inode *inode, struct file *file);
2947 int btrfs_dirty_pages(struct inode *inode, struct page **pages,
2948                       size_t num_pages, loff_t pos, size_t write_bytes,
2949                       struct extent_state **cached);
2950 int btrfs_fdatawrite_range(struct inode *inode, loff_t start, loff_t end);
2951 loff_t btrfs_remap_file_range(struct file *file_in, loff_t pos_in,
2952                               struct file *file_out, loff_t pos_out,
2953                               loff_t len, unsigned int remap_flags);
2954 
2955 /* tree-defrag.c */
2956 int btrfs_defrag_leaves(struct btrfs_trans_handle *trans,
2957                         struct btrfs_root *root);
2958 
2959 /* super.c */
2960 int btrfs_parse_options(struct btrfs_fs_info *info, char *options,
2961                         unsigned long new_flags);
2962 int btrfs_sync_fs(struct super_block *sb, int wait);
2963 
2964 static inline __printf(2, 3) __cold
2965 void btrfs_no_printk(const struct btrfs_fs_info *fs_info, const char *fmt, ...)
2966 {
2967 }
2968 
2969 #ifdef CONFIG_PRINTK
2970 __printf(2, 3)
2971 __cold
2972 void btrfs_printk(const struct btrfs_fs_info *fs_info, const char *fmt, ...);
2973 #else
2974 #define btrfs_printk(fs_info, fmt, args...) \
2975         btrfs_no_printk(fs_info, fmt, ##args)
2976 #endif
2977 
2978 #define btrfs_emerg(fs_info, fmt, args...) \
2979         btrfs_printk(fs_info, KERN_EMERG fmt, ##args)
2980 #define btrfs_alert(fs_info, fmt, args...) \
2981         btrfs_printk(fs_info, KERN_ALERT fmt, ##args)
2982 #define btrfs_crit(fs_info, fmt, args...) \
2983         btrfs_printk(fs_info, KERN_CRIT fmt, ##args)
2984 #define btrfs_err(fs_info, fmt, args...) \
2985         btrfs_printk(fs_info, KERN_ERR fmt, ##args)
2986 #define btrfs_warn(fs_info, fmt, args...) \
2987         btrfs_printk(fs_info, KERN_WARNING fmt, ##args)
2988 #define btrfs_notice(fs_info, fmt, args...) \
2989         btrfs_printk(fs_info, KERN_NOTICE fmt, ##args)
2990 #define btrfs_info(fs_info, fmt, args...) \
2991         btrfs_printk(fs_info, KERN_INFO fmt, ##args)
2992 
2993 /*
2994  * Wrappers that use printk_in_rcu
2995  */
2996 #define btrfs_emerg_in_rcu(fs_info, fmt, args...) \
2997         btrfs_printk_in_rcu(fs_info, KERN_EMERG fmt, ##args)
2998 #define btrfs_alert_in_rcu(fs_info, fmt, args...) \
2999         btrfs_printk_in_rcu(fs_info, KERN_ALERT fmt, ##args)
3000 #define btrfs_crit_in_rcu(fs_info, fmt, args...) \
3001         btrfs_printk_in_rcu(fs_info, KERN_CRIT fmt, ##args)
3002 #define btrfs_err_in_rcu(fs_info, fmt, args...) \
3003         btrfs_printk_in_rcu(fs_info, KERN_ERR fmt, ##args)
3004 #define btrfs_warn_in_rcu(fs_info, fmt, args...) \
3005         btrfs_printk_in_rcu(fs_info, KERN_WARNING fmt, ##args)
3006 #define btrfs_notice_in_rcu(fs_info, fmt, args...) \
3007         btrfs_printk_in_rcu(fs_info, KERN_NOTICE fmt, ##args)
3008 #define btrfs_info_in_rcu(fs_info, fmt, args...) \
3009         btrfs_printk_in_rcu(fs_info, KERN_INFO fmt, ##args)
3010 
3011 /*
3012  * Wrappers that use a ratelimited printk_in_rcu
3013  */
3014 #define btrfs_emerg_rl_in_rcu(fs_info, fmt, args...) \
3015         btrfs_printk_rl_in_rcu(fs_info, KERN_EMERG fmt, ##args)
3016 #define btrfs_alert_rl_in_rcu(fs_info, fmt, args...) \
3017         btrfs_printk_rl_in_rcu(fs_info, KERN_ALERT fmt, ##args)
3018 #define btrfs_crit_rl_in_rcu(fs_info, fmt, args...) \
3019         btrfs_printk_rl_in_rcu(fs_info, KERN_CRIT fmt, ##args)
3020 #define btrfs_err_rl_in_rcu(fs_info, fmt, args...) \
3021         btrfs_printk_rl_in_rcu(fs_info, KERN_ERR fmt, ##args)
3022 #define btrfs_warn_rl_in_rcu(fs_info, fmt, args...) \
3023         btrfs_printk_rl_in_rcu(fs_info, KERN_WARNING fmt, ##args)
3024 #define btrfs_notice_rl_in_rcu(fs_info, fmt, args...) \
3025         btrfs_printk_rl_in_rcu(fs_info, KERN_NOTICE fmt, ##args)
3026 #define btrfs_info_rl_in_rcu(fs_info, fmt, args...) \
3027         btrfs_printk_rl_in_rcu(fs_info, KERN_INFO fmt, ##args)
3028 
3029 /*
3030  * Wrappers that use a ratelimited printk
3031  */
3032 #define btrfs_emerg_rl(fs_info, fmt, args...) \
3033         btrfs_printk_ratelimited(fs_info, KERN_EMERG fmt, ##args)
3034 #define btrfs_alert_rl(fs_info, fmt, args...) \
3035         btrfs_printk_ratelimited(fs_info, KERN_ALERT fmt, ##args)
3036 #define btrfs_crit_rl(fs_info, fmt, args...) \
3037         btrfs_printk_ratelimited(fs_info, KERN_CRIT fmt, ##args)
3038 #define btrfs_err_rl(fs_info, fmt, args...) \
3039         btrfs_printk_ratelimited(fs_info, KERN_ERR fmt, ##args)
3040 #define btrfs_warn_rl(fs_info, fmt, args...) \
3041         btrfs_printk_ratelimited(fs_info, KERN_WARNING fmt, ##args)
3042 #define btrfs_notice_rl(fs_info, fmt, args...) \
3043         btrfs_printk_ratelimited(fs_info, KERN_NOTICE fmt, ##args)
3044 #define btrfs_info_rl(fs_info, fmt, args...) \
3045         btrfs_printk_ratelimited(fs_info, KERN_INFO fmt, ##args)
3046 
3047 #if defined(CONFIG_DYNAMIC_DEBUG)
3048 #define btrfs_debug(fs_info, fmt, args...)                              \
3049         _dynamic_func_call_no_desc(fmt, btrfs_printk,                   \
3050                                    fs_info, KERN_DEBUG fmt, ##args)
3051 #define btrfs_debug_in_rcu(fs_info, fmt, args...)                       \
3052         _dynamic_func_call_no_desc(fmt, btrfs_printk_in_rcu,            \
3053                                    fs_info, KERN_DEBUG fmt, ##args)
3054 #define btrfs_debug_rl_in_rcu(fs_info, fmt, args...)                    \
3055         _dynamic_func_call_no_desc(fmt, btrfs_printk_rl_in_rcu,         \
3056                                    fs_info, KERN_DEBUG fmt, ##args)
3057 #define btrfs_debug_rl(fs_info, fmt, args...)                           \
3058         _dynamic_func_call_no_desc(fmt, btrfs_printk_ratelimited,       \
3059                                    fs_info, KERN_DEBUG fmt, ##args)
3060 #elif defined(DEBUG)
3061 #define btrfs_debug(fs_info, fmt, args...) \
3062         btrfs_printk(fs_info, KERN_DEBUG fmt, ##args)
3063 #define btrfs_debug_in_rcu(fs_info, fmt, args...) \
3064         btrfs_printk_in_rcu(fs_info, KERN_DEBUG fmt, ##args)
3065 #define btrfs_debug_rl_in_rcu(fs_info, fmt, args...) \
3066         btrfs_printk_rl_in_rcu(fs_info, KERN_DEBUG fmt, ##args)
3067 #define btrfs_debug_rl(fs_info, fmt, args...) \
3068         btrfs_printk_ratelimited(fs_info, KERN_DEBUG fmt, ##args)
3069 #else
3070 #define btrfs_debug(fs_info, fmt, args...) \
3071         btrfs_no_printk(fs_info, KERN_DEBUG fmt, ##args)
3072 #define btrfs_debug_in_rcu(fs_info, fmt, args...) \
3073         btrfs_no_printk_in_rcu(fs_info, KERN_DEBUG fmt, ##args)
3074 #define btrfs_debug_rl_in_rcu(fs_info, fmt, args...) \
3075         btrfs_no_printk_in_rcu(fs_info, KERN_DEBUG fmt, ##args)
3076 #define btrfs_debug_rl(fs_info, fmt, args...) \
3077         btrfs_no_printk(fs_info, KERN_DEBUG fmt, ##args)
3078 #endif
3079 
3080 #define btrfs_printk_in_rcu(fs_info, fmt, args...)      \
3081 do {                                                    \
3082         rcu_read_lock();                                \
3083         btrfs_printk(fs_info, fmt, ##args);             \
3084         rcu_read_unlock();                              \
3085 } while (0)
3086 
3087 #define btrfs_no_printk_in_rcu(fs_info, fmt, args...)   \
3088 do {                                                    \
3089         rcu_read_lock();                                \
3090         btrfs_no_printk(fs_info, fmt, ##args);          \
3091         rcu_read_unlock();                              \
3092 } while (0)
3093 
3094 #define btrfs_printk_ratelimited(fs_info, fmt, args...)         \
3095 do {                                                            \
3096         static DEFINE_RATELIMIT_STATE(_rs,                      \
3097                 DEFAULT_RATELIMIT_INTERVAL,                     \
3098                 DEFAULT_RATELIMIT_BURST);                       \
3099         if (__ratelimit(&_rs))                                  \
3100                 btrfs_printk(fs_info, fmt, ##args);             \
3101 } while (0)
3102 
3103 #define btrfs_printk_rl_in_rcu(fs_info, fmt, args...)           \
3104 do {                                                            \
3105         rcu_read_lock();                                        \
3106         btrfs_printk_ratelimited(fs_info, fmt, ##args);         \
3107         rcu_read_unlock();                                      \
3108 } while (0)
3109 
3110 #ifdef CONFIG_BTRFS_ASSERT
3111 __cold __noreturn
3112 static inline void assertfail(const char *expr, const char *file, int line)
3113 {
3114         pr_err("assertion failed: %s, in %s:%d\n", expr, file, line);
3115         BUG();
3116 }
3117 
3118 #define ASSERT(expr)                                            \
3119         (likely(expr) ? (void)0 : assertfail(#expr, __FILE__, __LINE__))
3120 
3121 #else
3122 static inline void assertfail(const char *expr, const char* file, int line) { }
3123 #define ASSERT(expr)    (void)(expr)
3124 #endif
3125 
3126 /*
3127  * Use that for functions that are conditionally exported for sanity tests but
3128  * otherwise static
3129  */
3130 #ifndef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
3131 #define EXPORT_FOR_TESTS static
3132 #else
3133 #define EXPORT_FOR_TESTS
3134 #endif
3135 
3136 __cold
3137 static inline void btrfs_print_v0_err(struct btrfs_fs_info *fs_info)
3138 {
3139         btrfs_err(fs_info,
3140 "Unsupported V0 extent filesystem detected. Aborting. Please re-create your filesystem with a newer kernel");
3141 }
3142 
3143 __printf(5, 6)
3144 __cold
3145 void __btrfs_handle_fs_error(struct btrfs_fs_info *fs_info, const char *function,
3146                      unsigned int line, int errno, const char *fmt, ...);
3147 
3148 const char *btrfs_decode_error(int errno);
3149 
3150 __cold
3151 void __btrfs_abort_transaction(struct btrfs_trans_handle *trans,
3152                                const char *function,
3153                                unsigned int line, int errno);
3154 
3155 /*
3156  * Call btrfs_abort_transaction as early as possible when an error condition is
3157  * detected, that way the exact line number is reported.
3158  */
3159 #define btrfs_abort_transaction(trans, errno)           \
3160 do {                                                            \
3161         /* Report first abort since mount */                    \
3162         if (!test_and_set_bit(BTRFS_FS_STATE_TRANS_ABORTED,     \
3163                         &((trans)->fs_info->fs_state))) {       \
3164                 if ((errno) != -EIO) {                          \
3165                         WARN(1, KERN_DEBUG                              \
3166                         "BTRFS: Transaction aborted (error %d)\n",      \
3167                         (errno));                                       \
3168                 } else {                                                \
3169                         btrfs_debug((trans)->fs_info,                   \
3170                                     "Transaction aborted (error %d)", \
3171                                   (errno));                     \
3172                 }                                               \
3173         }                                                       \
3174         __btrfs_abort_transaction((trans), __func__,            \
3175                                   __LINE__, (errno));           \
3176 } while (0)
3177 
3178 #define btrfs_handle_fs_error(fs_info, errno, fmt, args...)             \
3179 do {                                                            \
3180         __btrfs_handle_fs_error((fs_info), __func__, __LINE__,  \
3181                           (errno), fmt, ##args);                \
3182 } while (0)
3183 
3184 __printf(5, 6)
3185 __cold
3186 void __btrfs_panic(struct btrfs_fs_info *fs_info, const char *function,
3187                    unsigned int line, int errno, const char *fmt, ...);
3188 /*
3189  * If BTRFS_MOUNT_PANIC_ON_FATAL_ERROR is in mount_opt, __btrfs_panic
3190  * will panic().  Otherwise we BUG() here.
3191  */
3192 #define btrfs_panic(fs_info, errno, fmt, args...)                       \
3193 do {                                                                    \
3194         __btrfs_panic(fs_info, __func__, __LINE__, errno, fmt, ##args); \
3195         BUG();                                                          \
3196 } while (0)
3197 
3198 
3199 /* compatibility and incompatibility defines */
3200 
3201 #define btrfs_set_fs_incompat(__fs_info, opt) \
3202         __btrfs_set_fs_incompat((__fs_info), BTRFS_FEATURE_INCOMPAT_##opt, \
3203                                 #opt)
3204 
3205 static inline void __btrfs_set_fs_incompat(struct btrfs_fs_info *fs_info,
3206                                            u64 flag, const char* name)
3207 {
3208         struct btrfs_super_block *disk_super;
3209         u64 features;
3210 
3211         disk_super = fs_info->super_copy;
3212         features = btrfs_super_incompat_flags(disk_super);
3213         if (!(features & flag)) {
3214                 spin_lock(&fs_info->super_lock);
3215                 features = btrfs_super_incompat_flags(disk_super);
3216                 if (!(features & flag)) {
3217                         features |= flag;
3218                         btrfs_set_super_incompat_flags(disk_super, features);
3219                         btrfs_info(fs_info,
3220                                 "setting incompat feature flag for %s (0x%llx)",
3221                                 name, flag);
3222                 }
3223                 spin_unlock(&fs_info->super_lock);
3224         }
3225 }
3226 
3227 #define btrfs_clear_fs_incompat(__fs_info, opt) \
3228         __btrfs_clear_fs_incompat((__fs_info), BTRFS_FEATURE_INCOMPAT_##opt, \
3229                                   #opt)
3230 
3231 static inline void __btrfs_clear_fs_incompat(struct btrfs_fs_info *fs_info,
3232                                              u64 flag, const char* name)
3233 {
3234         struct btrfs_super_block *disk_super;
3235         u64 features;
3236 
3237         disk_super = fs_info->super_copy;
3238         features = btrfs_super_incompat_flags(disk_super);
3239         if (features & flag) {
3240                 spin_lock(&fs_info->super_lock);
3241                 features = btrfs_super_incompat_flags(disk_super);
3242                 if (features & flag) {
3243                         features &= ~flag;
3244                         btrfs_set_super_incompat_flags(disk_super, features);
3245                         btrfs_info(fs_info,
3246                                 "clearing incompat feature flag for %s (0x%llx)",
3247                                 name, flag);
3248                 }
3249                 spin_unlock(&fs_info->super_lock);
3250         }
3251 }
3252 
3253 #define btrfs_fs_incompat(fs_info, opt) \
3254         __btrfs_fs_incompat((fs_info), BTRFS_FEATURE_INCOMPAT_##opt)
3255 
3256 static inline bool __btrfs_fs_incompat(struct btrfs_fs_info *fs_info, u64 flag)
3257 {
3258         struct btrfs_super_block *disk_super;
3259         disk_super = fs_info->super_copy;
3260         return !!(btrfs_super_incompat_flags(disk_super) & flag);
3261 }
3262 
3263 #define btrfs_set_fs_compat_ro(__fs_info, opt) \
3264         __btrfs_set_fs_compat_ro((__fs_info), BTRFS_FEATURE_COMPAT_RO_##opt, \
3265                                  #opt)
3266 
3267 static inline void __btrfs_set_fs_compat_ro(struct btrfs_fs_info *fs_info,
3268                                             u64 flag, const char *name)
3269 {
3270         struct btrfs_super_block *disk_super;
3271         u64 features;
3272 
3273         disk_super = fs_info->super_copy;
3274         features = btrfs_super_compat_ro_flags(disk_super);
3275         if (!(features & flag)) {
3276                 spin_lock(&fs_info->super_lock);
3277                 features = btrfs_super_compat_ro_flags(disk_super);
3278                 if (!(features & flag)) {
3279                         features |= flag;
3280                         btrfs_set_super_compat_ro_flags(disk_super, features);
3281                         btrfs_info(fs_info,
3282                                 "setting compat-ro feature flag for %s (0x%llx)",
3283                                 name, flag);
3284                 }
3285                 spin_unlock(&fs_info->super_lock);
3286         }
3287 }
3288 
3289 #define btrfs_clear_fs_compat_ro(__fs_info, opt) \
3290         __btrfs_clear_fs_compat_ro((__fs_info), BTRFS_FEATURE_COMPAT_RO_##opt, \
3291                                    #opt)
3292 
3293 static inline void __btrfs_clear_fs_compat_ro(struct btrfs_fs_info *fs_info,
3294                                               u64 flag, const char *name)
3295 {
3296         struct btrfs_super_block *disk_super;
3297         u64 features;
3298 
3299         disk_super = fs_info->super_copy;
3300         features = btrfs_super_compat_ro_flags(disk_super);
3301         if (features & flag) {
3302                 spin_lock(&fs_info->super_lock);
3303                 features = btrfs_super_compat_ro_flags(disk_super);
3304                 if (features & flag) {
3305                         features &= ~flag;
3306                         btrfs_set_super_compat_ro_flags(disk_super, features);
3307                         btrfs_info(fs_info,
3308                                 "clearing compat-ro feature flag for %s (0x%llx)",
3309                                 name, flag);
3310                 }
3311                 spin_unlock(&fs_info->super_lock);
3312         }
3313 }
3314 
3315 #define btrfs_fs_compat_ro(fs_info, opt) \
3316         __btrfs_fs_compat_ro((fs_info), BTRFS_FEATURE_COMPAT_RO_##opt)
3317 
3318 static inline int __btrfs_fs_compat_ro(struct btrfs_fs_info *fs_info, u64 flag)
3319 {
3320         struct btrfs_super_block *disk_super;
3321         disk_super = fs_info->super_copy;
3322         return !!(btrfs_super_compat_ro_flags(disk_super) & flag);
3323 }
3324 
3325 /* acl.c */
3326 #ifdef CONFIG_BTRFS_FS_POSIX_ACL
3327 struct posix_acl *btrfs_get_acl(struct inode *inode, int type);
3328 int btrfs_set_acl(struct inode *inode, struct posix_acl *acl, int type);
3329 int btrfs_init_acl(struct btrfs_trans_handle *trans,
3330                    struct inode *inode, struct inode *dir);
3331 #else
3332 #define btrfs_get_acl NULL
3333 #define btrfs_set_acl NULL
3334 static inline int btrfs_init_acl(struct btrfs_trans_handle *trans,
3335                                  struct inode *inode, struct inode *dir)
3336 {
3337         return 0;
3338 }
3339 #endif
3340 
3341 /* relocation.c */
3342 int btrfs_relocate_block_group(struct btrfs_fs_info *fs_info, u64 group_start);
3343 int btrfs_init_reloc_root(struct btrfs_trans_handle *trans,
3344                           struct btrfs_root *root);
3345 int btrfs_update_reloc_root(struct btrfs_trans_handle *trans,
3346                             struct btrfs_root *root);
3347 int btrfs_recover_relocation(struct btrfs_root *root);
3348 int btrfs_reloc_clone_csums(struct inode *inode, u64 file_pos, u64 len);
3349 int btrfs_reloc_cow_block(struct btrfs_trans_handle *trans,
3350                           struct btrfs_root *root, struct extent_buffer *buf,
3351                           struct extent_buffer *cow);
3352 void btrfs_reloc_pre_snapshot(struct btrfs_pending_snapshot *pending,
3353                               u64 *bytes_to_reserve);
3354 int btrfs_reloc_post_snapshot(struct btrfs_trans_handle *trans,
3355                               struct btrfs_pending_snapshot *pending);
3356 
3357 /* scrub.c */
3358 int btrfs_scrub_dev(struct btrfs_fs_info *fs_info, u64 devid, u64 start,
3359                     u64 end, struct btrfs_scrub_progress *progress,
3360                     int readonly, int is_dev_replace);
3361 void btrfs_scrub_pause(struct btrfs_fs_info *fs_info);
3362 void btrfs_scrub_continue(struct btrfs_fs_info *fs_info);
3363 int btrfs_scrub_cancel(struct btrfs_fs_info *info);
3364 int btrfs_scrub_cancel_dev(struct btrfs_device *dev);
3365 int btrfs_scrub_progress(struct btrfs_fs_info *fs_info, u64 devid,
3366                          struct btrfs_scrub_progress *progress);
3367 static inline void btrfs_init_full_stripe_locks_tree(
3368                         struct btrfs_full_stripe_locks_tree *locks_root)
3369 {
3370         locks_root->root = RB_ROOT;
3371         mutex_init(&locks_root->lock);
3372 }
3373 
3374 /* dev-replace.c */
3375 void btrfs_bio_counter_inc_blocked(struct btrfs_fs_info *fs_info);
3376 void btrfs_bio_counter_inc_noblocked(struct btrfs_fs_info *fs_info);
3377 void btrfs_bio_counter_sub(struct btrfs_fs_info *fs_info, s64 amount);
3378 
3379 static inline void btrfs_bio_counter_dec(struct btrfs_fs_info *fs_info)
3380 {
3381         btrfs_bio_counter_sub(fs_info, 1);
3382 }
3383 
3384 /* reada.c */
3385 struct reada_control {
3386         struct btrfs_fs_info    *fs_info;               /* tree to prefetch */
3387         struct btrfs_key        key_start;
3388         struct btrfs_key        key_end;        /* exclusive */
3389         atomic_t                elems;
3390         struct kref             refcnt;
3391         wait_queue_head_t       wait;
3392 };
3393 struct reada_control *btrfs_reada_add(struct btrfs_root *root,
3394                               struct btrfs_key *start, struct btrfs_key *end);
3395 int btrfs_reada_wait(void *handle);
3396 void btrfs_reada_detach(void *handle);
3397 int btree_readahead_hook(struct extent_buffer *eb, int err);
3398 
3399 static inline int is_fstree(u64 rootid)
3400 {
3401         if (rootid == BTRFS_FS_TREE_OBJECTID ||
3402             ((s64)rootid >= (s64)BTRFS_FIRST_FREE_OBJECTID &&
3403               !btrfs_qgroup_level(rootid)))
3404                 return 1;
3405         return 0;
3406 }
3407 
3408 static inline int btrfs_defrag_cancelled(struct btrfs_fs_info *fs_info)
3409 {
3410         return signal_pending(current);
3411 }
3412 
3413 #define in_range(b, first, len) ((b) >= (first) && (b) < (first) + (len))
3414 
3415 /* Sanity test specific functions */
3416 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
3417 void btrfs_test_inode_set_ops(struct inode *inode);
3418 void btrfs_test_destroy_inode(struct inode *inode);
3419 
3420 static inline int btrfs_is_testing(struct btrfs_fs_info *fs_info)
3421 {
3422         return test_bit(BTRFS_FS_STATE_DUMMY_FS_INFO, &fs_info->fs_state);
3423 }
3424 #else
3425 static inline int btrfs_is_testing(struct btrfs_fs_info *fs_info)
3426 {
3427         return 0;
3428 }
3429 #endif
3430 
3431 #endif
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root/fs/btrfs/ctree.h

INCLUDED FROM

DEFINITIONS
