ctree.h

   1 /*
   2  * Copyright (C) 2007 Oracle.  All rights reserved.
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public
   6  * License v2 as published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  11  * General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public
  14  * License along with this program; if not, write to the
  15  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  16  * Boston, MA 021110-1307, USA.
  17  */
  18
  19 #ifndef __BTRFS_CTREE_H__
  20 #define __BTRFS_CTREE_H__
  21
  22 #include <stdbool.h>
  23
  24 #if BTRFS_FLAT_INCLUDES
  25 #include "list.h"
  26 #include "kerncompat.h"
  27 #include "radix-tree.h"
  28 #include "extent-cache.h"
  29 #include "extent_io.h"
  30 #include "ioctl.h"
  31 #include "sizes.h"
  32 #else
  33 #include <btrfs/list.h>
  34 #include <btrfs/kerncompat.h>
  35 #include <btrfs/radix-tree.h>
  36 #include <btrfs/extent-cache.h>
  37 #include <btrfs/extent_io.h>
  38 #include <btrfs/ioctl.h>
  39 #include <btrfs/sizes.h>
  40 #endif /* BTRFS_FLAT_INCLUDES */
  41
  42 struct btrfs_root;
  43 struct btrfs_trans_handle;
  44 struct btrfs_free_space_ctl;
  45 #define BTRFS_MAGIC 0x4D5F53665248425FULL /* ascii _BHRfS_M, no null */
  46
  47 /*
  48  * Fake signature for an unfinalized filesystem, which only has barebone tree
  49  * structures (normally 6 near empty trees, on SINGLE meta/sys temporary chunks)
  50  *
  51  * ascii !BHRfS_M, no null
  52  */
  53 #define BTRFS_MAGIC_TEMPORARY 0x4D5F536652484221ULL
  54
  55 #define BTRFS_MAX_MIRRORS 3
  56
  57 #define BTRFS_MAX_LEVEL 8
  58
  59 #define BTRFS_COMPAT_EXTENT_TREE_V0
  60
  61 /* holds pointers to all of the tree roots */
  62 #define BTRFS_ROOT_TREE_OBJECTID 1ULL
  63
  64 /* stores information about which extents are in use, and reference counts */
  65 #define BTRFS_EXTENT_TREE_OBJECTID 2ULL
  66
  67 /*
  68  * chunk tree stores translations from logical -> physical block numbering
  69  * the super block points to the chunk tree
  70  */
  71 #define BTRFS_CHUNK_TREE_OBJECTID 3ULL
  72
  73 /*
  74  * stores information about which areas of a given device are in use.
  75  * one per device.  The tree of tree roots points to the device tree
  76  */
  77 #define BTRFS_DEV_TREE_OBJECTID 4ULL
  78
  79 /* one per subvolume, storing files and directories */
  80 #define BTRFS_FS_TREE_OBJECTID 5ULL
  81
  82 /* directory objectid inside the root tree */
  83 #define BTRFS_ROOT_TREE_DIR_OBJECTID 6ULL
  84 /* holds checksums of all the data extents */
  85 #define BTRFS_CSUM_TREE_OBJECTID 7ULL
  86 #define BTRFS_QUOTA_TREE_OBJECTID 8ULL
  87
  88 /* for storing items that use the BTRFS_UUID_KEY* */
  89 #define BTRFS_UUID_TREE_OBJECTID 9ULL
  90
  91 /* tracks free space in block groups. */
  92 #define BTRFS_FREE_SPACE_TREE_OBJECTID 10ULL
  93
  94 /* device stats in the device tree */
  95 #define BTRFS_DEV_STATS_OBJECTID 0ULL
  96
  97 /* for storing balance parameters in the root tree */
  98 #define BTRFS_BALANCE_OBJECTID -4ULL
  99
 100 /* oprhan objectid for tracking unlinked/truncated files */
 101 #define BTRFS_ORPHAN_OBJECTID -5ULL
 102
 103 /* does write ahead logging to speed up fsyncs */
 104 #define BTRFS_TREE_LOG_OBJECTID -6ULL
 105 #define BTRFS_TREE_LOG_FIXUP_OBJECTID -7ULL
 106
 107 /* space balancing */
 108 #define BTRFS_TREE_RELOC_OBJECTID -8ULL
 109 #define BTRFS_DATA_RELOC_TREE_OBJECTID -9ULL
 110
 111 /*
 112  * extent checksums all have this objectid
 113  * this allows them to share the logging tree
 114  * for fsyncs
 115  */
 116 #define BTRFS_EXTENT_CSUM_OBJECTID -10ULL
 117
 118 /* For storing free space cache */
 119 #define BTRFS_FREE_SPACE_OBJECTID -11ULL
 120
 121 /*
 122  * The inode number assigned to the special inode for sotring
 123  * free ino cache
 124  */
 125 #define BTRFS_FREE_INO_OBJECTID -12ULL
 126
 127 /* dummy objectid represents multiple objectids */
 128 #define BTRFS_MULTIPLE_OBJECTIDS -255ULL
 129
 130 /*
 131  * All files have objectids in this range.
 132  */
 133 #define BTRFS_FIRST_FREE_OBJECTID 256ULL
 134 #define BTRFS_LAST_FREE_OBJECTID -256ULL
 135 #define BTRFS_FIRST_CHUNK_TREE_OBJECTID 256ULL
 136
 137
 138
 139 /*
 140  * the device items go into the chunk tree.  The key is in the form
 141  * [ 1 BTRFS_DEV_ITEM_KEY device_id ]
 142  */
 143 #define BTRFS_DEV_ITEMS_OBJECTID 1ULL
 144
 145 #define BTRFS_EMPTY_SUBVOL_DIR_OBJECTID 2ULL
 146
 147 /*
 148  * the max metadata block size.  This limit is somewhat artificial,
 149  * but the memmove costs go through the roof for larger blocks.
 150  */
 151 #define BTRFS_MAX_METADATA_BLOCKSIZE 65536
 152
 153 /*
 154  * we can actually store much bigger names, but lets not confuse the rest
 155  * of linux
 156  */
 157 #define BTRFS_NAME_LEN 255
 158
 159 /*
 160  * Theoretical limit is larger, but we keep this down to a sane
 161  * value. That should limit greatly the possibility of collisions on
 162  * inode ref items.
 163  */
 164 #define BTRFS_LINK_MAX  65535U
 165
 166 /* 32 bytes in various csum fields */
 167 #define BTRFS_CSUM_SIZE 32
 168
 169 /* csum types */
 170 #define BTRFS_CSUM_TYPE_CRC32   0
 171
 172 /* four bytes for CRC32 */
 173 static int btrfs_csum_sizes[] = { 4 };
 174
 175 #define BTRFS_EMPTY_DIR_SIZE 0
 176
 177 #define BTRFS_FT_UNKNOWN        0
 178 #define BTRFS_FT_REG_FILE       1
 179 #define BTRFS_FT_DIR            2
 180 #define BTRFS_FT_CHRDEV         3
 181 #define BTRFS_FT_BLKDEV         4
 182 #define BTRFS_FT_FIFO           5
 183 #define BTRFS_FT_SOCK           6
 184 #define BTRFS_FT_SYMLINK        7
 185 #define BTRFS_FT_XATTR          8
 186 #define BTRFS_FT_MAX            9
 187
 188 #define BTRFS_ROOT_SUBVOL_RDONLY        (1ULL << 0)
 189
 190 /*
 191  * the key defines the order in the tree, and so it also defines (optimal)
 192  * block layout.  objectid corresponds to the inode number.  The flags
 193  * tells us things about the object, and is a kind of stream selector.
 194  * so for a given inode, keys with flags of 1 might refer to the inode
 195  * data, flags of 2 may point to file data in the btree and flags == 3
 196  * may point to extents.
 197  *
 198  * offset is the starting byte offset for this key in the stream.
 199  *
 200  * btrfs_disk_key is in disk byte order.  struct btrfs_key is always
 201  * in cpu native order.  Otherwise they are identical and their sizes
 202  * should be the same (ie both packed)
 203  */
 204 struct btrfs_disk_key {
 205         __le64 objectid;
 206         u8 type;
 207         __le64 offset;
 208 } __attribute__ ((__packed__));
 209
 210 struct btrfs_key {
 211         u64 objectid;
 212         u8 type;
 213         u64 offset;
 214 } __attribute__ ((__packed__));
 215
 216 struct btrfs_mapping_tree {
 217         struct cache_tree cache_tree;
 218 };
 219
 220 #define BTRFS_UUID_SIZE 16
 221 struct btrfs_dev_item {
 222         /* the internal btrfs device id */
 223         __le64 devid;
 224
 225         /* size of the device */
 226         __le64 total_bytes;
 227
 228         /* bytes used */
 229         __le64 bytes_used;
 230
 231         /* optimal io alignment for this device */
 232         __le32 io_align;
 233
 234         /* optimal io width for this device */
 235         __le32 io_width;
 236
 237         /* minimal io size for this device */
 238         __le32 sector_size;
 239
 240         /* type and info about this device */
 241         __le64 type;
 242
 243         /* expected generation for this device */
 244         __le64 generation;
 245
 246         /*
 247          * starting byte of this partition on the device,
 248          * to allow for stripe alignment in the future
 249          */
 250         __le64 start_offset;
 251
 252         /* grouping information for allocation decisions */
 253         __le32 dev_group;
 254
 255         /* seek speed 0-100 where 100 is fastest */
 256         u8 seek_speed;
 257
 258         /* bandwidth 0-100 where 100 is fastest */
 259         u8 bandwidth;
 260
 261         /* btrfs generated uuid for this device */
 262         u8 uuid[BTRFS_UUID_SIZE];
 263
 264         /* uuid of FS who owns this device */
 265         u8 fsid[BTRFS_UUID_SIZE];
 266 } __attribute__ ((__packed__));
 267
 268 struct btrfs_stripe {
 269         __le64 devid;
 270         __le64 offset;
 271         u8 dev_uuid[BTRFS_UUID_SIZE];
 272 } __attribute__ ((__packed__));
 273
 274 struct btrfs_chunk {
 275         /* size of this chunk in bytes */
 276         __le64 length;
 277
 278         /* objectid of the root referencing this chunk */
 279         __le64 owner;
 280
 281         __le64 stripe_len;
 282         __le64 type;
 283
 284         /* optimal io alignment for this chunk */
 285         __le32 io_align;
 286
 287         /* optimal io width for this chunk */
 288         __le32 io_width;
 289
 290         /* minimal io size for this chunk */
 291         __le32 sector_size;
 292
 293         /* 2^16 stripes is quite a lot, a second limit is the size of a single
 294          * item in the btree
 295          */
 296         __le16 num_stripes;
 297
 298         /* sub stripes only matter for raid10 */
 299         __le16 sub_stripes;
 300         struct btrfs_stripe stripe;
 301         /* additional stripes go here */
 302 } __attribute__ ((__packed__));
 303
 304 #define BTRFS_FREE_SPACE_EXTENT 1
 305 #define BTRFS_FREE_SPACE_BITMAP 2
 306
 307 struct btrfs_free_space_entry {
 308         __le64 offset;
 309         __le64 bytes;
 310         u8 type;
 311 } __attribute__ ((__packed__));
 312
 313 struct btrfs_free_space_header {
 314         struct btrfs_disk_key location;
 315         __le64 generation;
 316         __le64 num_entries;
 317         __le64 num_bitmaps;
 318 } __attribute__ ((__packed__));
 319
 320 static inline unsigned long btrfs_chunk_item_size(int num_stripes)
 321 {
 322         BUG_ON(num_stripes == 0);
 323         return sizeof(struct btrfs_chunk) +
 324                 sizeof(struct btrfs_stripe) * (num_stripes - 1);
 325 }
 326
 327 #define BTRFS_HEADER_FLAG_WRITTEN               (1ULL << 0)
 328 #define BTRFS_HEADER_FLAG_RELOC                 (1ULL << 1)
 329 #define BTRFS_SUPER_FLAG_SEEDING                (1ULL << 32)
 330 #define BTRFS_SUPER_FLAG_METADUMP               (1ULL << 33)
 331 #define BTRFS_SUPER_FLAG_METADUMP_V2            (1ULL << 34)
 332 #define BTRFS_SUPER_FLAG_CHANGING_FSID          (1ULL << 35)
 333
 334 #define BTRFS_BACKREF_REV_MAX           256
 335 #define BTRFS_BACKREF_REV_SHIFT         56
 336 #define BTRFS_BACKREF_REV_MASK          (((u64)BTRFS_BACKREF_REV_MAX - 1) << \
 337                                          BTRFS_BACKREF_REV_SHIFT)
 338
 339 #define BTRFS_OLD_BACKREF_REV           0
 340 #define BTRFS_MIXED_BACKREF_REV         1
 341
 342 /*
 343  * every tree block (leaf or node) starts with this header.
 344  */
 345 struct btrfs_header {
 346         /* these first four must match the super block */
 347         u8 csum[BTRFS_CSUM_SIZE];
 348         u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
 349         __le64 bytenr; /* which block this node is supposed to live in */
 350         __le64 flags;
 351
 352         /* allowed to be different from the super from here on down */
 353         u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
 354         __le64 generation;
 355         __le64 owner;
 356         __le32 nritems;
 357         u8 level;
 358 } __attribute__ ((__packed__));
 359
 360 #define __BTRFS_LEAF_DATA_SIZE(bs) ((bs) - sizeof(struct btrfs_header))
 361 #define BTRFS_LEAF_DATA_SIZE(fs_info) \
 362                                 (__BTRFS_LEAF_DATA_SIZE(fs_info->nodesize))
 363
 364 /*
 365  * this is a very generous portion of the super block, giving us
 366  * room to translate 14 chunks with 3 stripes each.
 367  */
 368 #define BTRFS_SYSTEM_CHUNK_ARRAY_SIZE 2048
 369 #define BTRFS_LABEL_SIZE 256
 370
 371 /*
 372  * just in case we somehow lose the roots and are not able to mount,
 373  * we store an array of the roots from previous transactions
 374  * in the super.
 375  */
 376 #define BTRFS_NUM_BACKUP_ROOTS 4
 377 struct btrfs_root_backup {
 378         __le64 tree_root;
 379         __le64 tree_root_gen;
 380
 381         __le64 chunk_root;
 382         __le64 chunk_root_gen;
 383
 384         __le64 extent_root;
 385         __le64 extent_root_gen;
 386
 387         __le64 fs_root;
 388         __le64 fs_root_gen;
 389
 390         __le64 dev_root;
 391         __le64 dev_root_gen;
 392
 393         __le64 csum_root;
 394         __le64 csum_root_gen;
 395
 396         __le64 total_bytes;
 397         __le64 bytes_used;
 398         __le64 num_devices;
 399         /* future */
 400         __le64 unsed_64[4];
 401
 402         u8 tree_root_level;
 403         u8 chunk_root_level;
 404         u8 extent_root_level;
 405         u8 fs_root_level;
 406         u8 dev_root_level;
 407         u8 csum_root_level;
 408         /* future and to align */
 409         u8 unused_8[10];
 410 } __attribute__ ((__packed__));
 411
 412 /*
 413  * the super block basically lists the main trees of the FS
 414  * it currently lacks any block count etc etc
 415  */
 416 struct btrfs_super_block {
 417         u8 csum[BTRFS_CSUM_SIZE];
 418         /* the first 3 fields must match struct btrfs_header */
 419         u8 fsid[BTRFS_FSID_SIZE];    /* FS specific uuid */
 420         __le64 bytenr; /* this block number */
 421         __le64 flags;
 422
 423         /* allowed to be different from the btrfs_header from here own down */
 424         __le64 magic;
 425         __le64 generation;
 426         __le64 root;
 427         __le64 chunk_root;
 428         __le64 log_root;
 429
 430         /* this will help find the new super based on the log root */
 431         __le64 log_root_transid;
 432         __le64 total_bytes;
 433         __le64 bytes_used;
 434         __le64 root_dir_objectid;
 435         __le64 num_devices;
 436         __le32 sectorsize;
 437         __le32 nodesize;
 438         /* Unused and must be equal to nodesize */
 439         __le32 __unused_leafsize;
 440         __le32 stripesize;
 441         __le32 sys_chunk_array_size;
 442         __le64 chunk_root_generation;
 443         __le64 compat_flags;
 444         __le64 compat_ro_flags;
 445         __le64 incompat_flags;
 446         __le16 csum_type;
 447         u8 root_level;
 448         u8 chunk_root_level;
 449         u8 log_root_level;
 450         struct btrfs_dev_item dev_item;
 451
 452         char label[BTRFS_LABEL_SIZE];
 453
 454         __le64 cache_generation;
 455         __le64 uuid_tree_generation;
 456
 457         /* future expansion */
 458         __le64 reserved[30];
 459         u8 sys_chunk_array[BTRFS_SYSTEM_CHUNK_ARRAY_SIZE];
 460         struct btrfs_root_backup super_roots[BTRFS_NUM_BACKUP_ROOTS];
 461 } __attribute__ ((__packed__));
 462
 463 /*
 464  * Compat flags that we support.  If any incompat flags are set other than the
 465  * ones specified below then we will fail to mount
 466  */
 467 #define BTRFS_FEATURE_COMPAT_RO_FREE_SPACE_TREE (1ULL << 0)
 468 /*
 469  * Older kernels on big-endian systems produced broken free space tree bitmaps,
 470  * and btrfs-progs also used to corrupt the free space tree. If this bit is
 471  * clear, then the free space tree cannot be trusted. btrfs-progs can also
 472  * intentionally clear this bit to ask the kernel to rebuild the free space
 473  * tree.
 474  */
 475 #define BTRFS_FEATURE_COMPAT_RO_FREE_SPACE_TREE_VALID   (1ULL << 1)
 476
 477 #define BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF    (1ULL << 0)
 478 #define BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL   (1ULL << 1)
 479 #define BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS     (1ULL << 2)
 480 #define BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO     (1ULL << 3)
 481 #define BTRFS_FEATURE_INCOMPAT_COMPRESS_ZSTD    (1ULL << 4)
 482
 483 /*
 484  * older kernels tried to do bigger metadata blocks, but the
 485  * code was pretty buggy.  Lets not let them try anymore.
 486  */
 487 #define BTRFS_FEATURE_INCOMPAT_BIG_METADATA     (1ULL << 5)
 488 #define BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF    (1ULL << 6)
 489 #define BTRFS_FEATURE_INCOMPAT_RAID56           (1ULL << 7)
 490 #define BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA  (1ULL << 8)
 491 #define BTRFS_FEATURE_INCOMPAT_NO_HOLES         (1ULL << 9)
 492
 493 #define BTRFS_FEATURE_COMPAT_SUPP               0ULL
 494
 495 /*
 496  * The FREE_SPACE_TREE and FREE_SPACE_TREE_VALID compat_ro bits must not be
 497  * added here until read-write support for the free space tree is implemented in
 498  * btrfs-progs.
 499  */
 500 #define BTRFS_FEATURE_COMPAT_RO_SUPP            0ULL
 501
 502 #define BTRFS_FEATURE_INCOMPAT_SUPP                     \
 503         (BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF |         \
 504          BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL |        \
 505          BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO |          \
 506          BTRFS_FEATURE_INCOMPAT_COMPRESS_ZSTD |         \
 507          BTRFS_FEATURE_INCOMPAT_BIG_METADATA |          \
 508          BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF |         \
 509          BTRFS_FEATURE_INCOMPAT_RAID56 |                \
 510          BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS |          \
 511          BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA |       \
 512          BTRFS_FEATURE_INCOMPAT_NO_HOLES)
 513
 514 /*
 515  * A leaf is full of items. offset and size tell us where to find
 516  * the item in the leaf (relative to the start of the data area)
 517  */
 518 struct btrfs_item {
 519         struct btrfs_disk_key key;
 520         __le32 offset;
 521         __le32 size;
 522 } __attribute__ ((__packed__));
 523
 524 /*
 525  * leaves have an item area and a data area:
 526  * [item0, item1....itemN] [free space] [dataN...data1, data0]
 527  *
 528  * The data is separate from the items to get the keys closer together
 529  * during searches.
 530  */
 531 struct btrfs_leaf {
 532         struct btrfs_header header;
 533         struct btrfs_item items[];
 534 } __attribute__ ((__packed__));
 535
 536 /*
 537  * all non-leaf blocks are nodes, they hold only keys and pointers to
 538  * other blocks
 539  */
 540 struct btrfs_key_ptr {
 541         struct btrfs_disk_key key;
 542         __le64 blockptr;
 543         __le64 generation;
 544 } __attribute__ ((__packed__));
 545
 546 struct btrfs_node {
 547         struct btrfs_header header;
 548         struct btrfs_key_ptr ptrs[];
 549 } __attribute__ ((__packed__));
 550
 551 /*
 552  * btrfs_paths remember the path taken from the root down to the leaf.
 553  * level 0 is always the leaf, and nodes[1...BTRFS_MAX_LEVEL] will point
 554  * to any other levels that are present.
 555  *
 556  * The slots array records the index of the item or block pointer
 557  * used while walking the tree.
 558  */
 559 enum { READA_NONE = 0, READA_BACK, READA_FORWARD };
 560 struct btrfs_path {
 561         struct extent_buffer *nodes[BTRFS_MAX_LEVEL];
 562         int slots[BTRFS_MAX_LEVEL];
 563 #if 0
 564         /* The kernel locking sheme is not done in userspace. */
 565         int locks[BTRFS_MAX_LEVEL];
 566 #endif
 567         signed char reada;
 568         /* keep some upper locks as we walk down */
 569         u8 lowest_level;
 570
 571         /*
 572          * set by btrfs_split_item, tells search_slot to keep all locks
 573          * and to force calls to keep space in the nodes
 574          */
 575         u8 search_for_split;
 576         u8 skip_check_block;
 577 };
 578
 579 /*
 580  * items in the extent btree are used to record the objectid of the
 581  * owner of the block and the number of references
 582  */
 583
 584 struct btrfs_extent_item {
 585         __le64 refs;
 586         __le64 generation;
 587         __le64 flags;
 588 } __attribute__ ((__packed__));
 589
 590 struct btrfs_extent_item_v0 {
 591         __le32 refs;
 592 } __attribute__ ((__packed__));
 593
 594 #define BTRFS_MAX_EXTENT_ITEM_SIZE(r) \
 595                         ((BTRFS_LEAF_DATA_SIZE(r->fs_info) >> 4) - \
 596                                         sizeof(struct btrfs_item))
 597 #define BTRFS_MAX_EXTENT_SIZE           SZ_128M
 598
 599 #define BTRFS_EXTENT_FLAG_DATA          (1ULL << 0)
 600 #define BTRFS_EXTENT_FLAG_TREE_BLOCK    (1ULL << 1)
 601
 602 /* following flags only apply to tree blocks */
 603
 604 /* use full backrefs for extent pointers in the block*/
 605 #define BTRFS_BLOCK_FLAG_FULL_BACKREF   (1ULL << 8)
 606
 607 struct btrfs_tree_block_info {
 608         struct btrfs_disk_key key;
 609         u8 level;
 610 } __attribute__ ((__packed__));
 611
 612 struct btrfs_extent_data_ref {
 613         __le64 root;
 614         __le64 objectid;
 615         __le64 offset;
 616         __le32 count;
 617 } __attribute__ ((__packed__));
 618
 619 struct btrfs_shared_data_ref {
 620         __le32 count;
 621 } __attribute__ ((__packed__));
 622
 623 struct btrfs_extent_inline_ref {
 624         u8 type;
 625         __le64 offset;
 626 } __attribute__ ((__packed__));
 627
 628 struct btrfs_extent_ref_v0 {
 629         __le64 root;
 630         __le64 generation;
 631         __le64 objectid;
 632         __le32 count;
 633 } __attribute__ ((__packed__));
 634
 635 /* dev extents record free space on individual devices.  The owner
 636  * field points back to the chunk allocation mapping tree that allocated
 637  * the extent.  The chunk tree uuid field is a way to double check the owner
 638  */
 639 struct btrfs_dev_extent {
 640         __le64 chunk_tree;
 641         __le64 chunk_objectid;
 642         __le64 chunk_offset;
 643         __le64 length;
 644         u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
 645 } __attribute__ ((__packed__));
 646
 647 struct btrfs_inode_ref {
 648         __le64 index;
 649         __le16 name_len;
 650         /* name goes here */
 651 } __attribute__ ((__packed__));
 652
 653 struct btrfs_inode_extref {
 654         __le64 parent_objectid;
 655         __le64 index;
 656         __le16 name_len;
 657         __u8   name[0]; /* name goes here */
 658 } __attribute__ ((__packed__));
 659
 660 struct btrfs_timespec {
 661         __le64 sec;
 662         __le32 nsec;
 663 } __attribute__ ((__packed__));
 664
 665 typedef enum {
 666         BTRFS_COMPRESS_NONE  = 0,
 667         BTRFS_COMPRESS_ZLIB  = 1,
 668         BTRFS_COMPRESS_LZO   = 2,
 669         BTRFS_COMPRESS_ZSTD  = 3,
 670         BTRFS_COMPRESS_TYPES = 3,
 671         BTRFS_COMPRESS_LAST  = 4,
 672 } btrfs_compression_type;
 673
 674 /* we don't understand any encryption methods right now */
 675 typedef enum {
 676         BTRFS_ENCRYPTION_NONE = 0,
 677         BTRFS_ENCRYPTION_LAST = 1,
 678 } btrfs_encryption_type;
 679
 680 enum btrfs_tree_block_status {
 681         BTRFS_TREE_BLOCK_CLEAN,
 682         BTRFS_TREE_BLOCK_INVALID_NRITEMS,
 683         BTRFS_TREE_BLOCK_INVALID_PARENT_KEY,
 684         BTRFS_TREE_BLOCK_BAD_KEY_ORDER,
 685         BTRFS_TREE_BLOCK_INVALID_LEVEL,
 686         BTRFS_TREE_BLOCK_INVALID_FREE_SPACE,
 687         BTRFS_TREE_BLOCK_INVALID_OFFSETS,
 688 };
 689
 690 struct btrfs_inode_item {
 691         /* nfs style generation number */
 692         __le64 generation;
 693         /* transid that last touched this inode */
 694         __le64 transid;
 695         __le64 size;
 696         __le64 nbytes;
 697         __le64 block_group;
 698         __le32 nlink;
 699         __le32 uid;
 700         __le32 gid;
 701         __le32 mode;
 702         __le64 rdev;
 703         __le64 flags;
 704
 705         /* modification sequence number for NFS */
 706         __le64 sequence;
 707
 708         /*
 709          * a little future expansion, for more than this we can
 710          * just grow the inode item and version it
 711          */
 712         __le64 reserved[4];
 713         struct btrfs_timespec atime;
 714         struct btrfs_timespec ctime;
 715         struct btrfs_timespec mtime;
 716         struct btrfs_timespec otime;
 717 } __attribute__ ((__packed__));
 718
 719 struct btrfs_dir_log_item {
 720         __le64 end;
 721 } __attribute__ ((__packed__));
 722
 723 struct btrfs_dir_item {
 724         struct btrfs_disk_key location;
 725         __le64 transid;
 726         __le16 data_len;
 727         __le16 name_len;
 728         u8 type;
 729 } __attribute__ ((__packed__));
 730
 731 struct btrfs_root_item_v0 {
 732         struct btrfs_inode_item inode;
 733         __le64 generation;
 734         __le64 root_dirid;
 735         __le64 bytenr;
 736         __le64 byte_limit;
 737         __le64 bytes_used;
 738         __le64 last_snapshot;
 739         __le64 flags;
 740         __le32 refs;
 741         struct btrfs_disk_key drop_progress;
 742         u8 drop_level;
 743         u8 level;
 744 } __attribute__ ((__packed__));
 745
 746 struct btrfs_root_item {
 747         struct btrfs_inode_item inode;
 748         __le64 generation;
 749         __le64 root_dirid;
 750         __le64 bytenr;
 751         __le64 byte_limit;
 752         __le64 bytes_used;
 753         __le64 last_snapshot;
 754         __le64 flags;
 755         __le32 refs;
 756         struct btrfs_disk_key drop_progress;
 757         u8 drop_level;
 758         u8 level;
 759
 760         /*
 761          * The following fields appear after subvol_uuids+subvol_times
 762          * were introduced.
 763          */
 764
 765         /*
 766          * This generation number is used to test if the new fields are valid
 767          * and up to date while reading the root item. Every time the root item
 768          * is written out, the "generation" field is copied into this field. If
 769          * anyone ever mounted the fs with an older kernel, we will have
 770          * mismatching generation values here and thus must invalidate the
 771          * new fields. See btrfs_update_root and btrfs_find_last_root for
 772          * details.
 773          * the offset of generation_v2 is also used as the start for the memset
 774          * when invalidating the fields.
 775          */
 776         __le64 generation_v2;
 777         u8 uuid[BTRFS_UUID_SIZE];
 778         u8 parent_uuid[BTRFS_UUID_SIZE];
 779         u8 received_uuid[BTRFS_UUID_SIZE];
 780         __le64 ctransid; /* updated when an inode changes */
 781         __le64 otransid; /* trans when created */
 782         __le64 stransid; /* trans when sent. non-zero for received subvol */
 783         __le64 rtransid; /* trans when received. non-zero for received subvol */
 784         struct btrfs_timespec ctime;
 785         struct btrfs_timespec otime;
 786         struct btrfs_timespec stime;
 787         struct btrfs_timespec rtime;
 788         __le64 reserved[8]; /* for future */
 789 } __attribute__ ((__packed__));
 790
 791 /*
 792  * this is used for both forward and backward root refs
 793  */
 794 struct btrfs_root_ref {
 795         __le64 dirid;
 796         __le64 sequence;
 797         __le16 name_len;
 798 } __attribute__ ((__packed__));
 799
 800 struct btrfs_disk_balance_args {
 801         /*
 802          * profiles to operate on, single is denoted by
 803          * BTRFS_AVAIL_ALLOC_BIT_SINGLE
 804          */
 805         __le64 profiles;
 806
 807         /*
 808          * usage filter
 809          * BTRFS_BALANCE_ARGS_USAGE with a single value means '0..N'
 810          * BTRFS_BALANCE_ARGS_USAGE_RANGE - range syntax, min..max
 811          */
 812         union {
 813                 __le64 usage;
 814                 struct {
 815                         __le32 usage_min;
 816                         __le32 usage_max;
 817                 };
 818         };
 819
 820         /* devid filter */
 821         __le64 devid;
 822
 823         /* devid subset filter [pstart..pend) */
 824         __le64 pstart;
 825         __le64 pend;
 826
 827         /* btrfs virtual address space subset filter [vstart..vend) */
 828         __le64 vstart;
 829         __le64 vend;
 830
 831         /*
 832          * profile to convert to, single is denoted by
 833          * BTRFS_AVAIL_ALLOC_BIT_SINGLE
 834          */
 835         __le64 target;
 836
 837         /* BTRFS_BALANCE_ARGS_* */
 838         __le64 flags;
 839
 840         /*
 841          * BTRFS_BALANCE_ARGS_LIMIT with value 'limit'
 842          * BTRFS_BALANCE_ARGS_LIMIT_RANGE - the extend version can use minimum
 843          * and maximum
 844          */
 845         union {
 846                 __le64 limit;
 847                 struct {
 848                         __le32 limit_min;
 849                         __le32 limit_max;
 850                 };
 851         };
 852
 853         /*
 854          * Process chunks that cross stripes_min..stripes_max devices,
 855          * BTRFS_BALANCE_ARGS_STRIPES_RANGE
 856          */
 857         __le32 stripes_min;
 858         __le32 stripes_max;
 859
 860         __le64 unused[6];
 861 } __attribute__ ((__packed__));
 862
 863 /*
 864  * store balance parameters to disk so that balance can be properly
 865  * resumed after crash or unmount
 866  */
 867 struct btrfs_balance_item {
 868         /* BTRFS_BALANCE_* */
 869         __le64 flags;
 870
 871         struct btrfs_disk_balance_args data;
 872         struct btrfs_disk_balance_args meta;
 873         struct btrfs_disk_balance_args sys;
 874
 875         __le64 unused[4];
 876 } __attribute__ ((__packed__));
 877
 878 #define BTRFS_FILE_EXTENT_INLINE 0
 879 #define BTRFS_FILE_EXTENT_REG 1
 880 #define BTRFS_FILE_EXTENT_PREALLOC 2
 881
 882 struct btrfs_file_extent_item {
 883         /*
 884          * transaction id that created this extent
 885          */
 886         __le64 generation;
 887         /*
 888          * max number of bytes to hold this extent in ram
 889          * when we split a compressed extent we can't know how big
 890          * each of the resulting pieces will be.  So, this is
 891          * an upper limit on the size of the extent in ram instead of
 892          * an exact limit.
 893          */
 894         __le64 ram_bytes;
 895
 896         /*
 897          * 32 bits for the various ways we might encode the data,
 898          * including compression and encryption.  If any of these
 899          * are set to something a given disk format doesn't understand
 900          * it is treated like an incompat flag for reading and writing,
 901          * but not for stat.
 902          */
 903         u8 compression;
 904         u8 encryption;
 905         __le16 other_encoding; /* spare for later use */
 906
 907         /* are we inline data or a real extent? */
 908         u8 type;
 909
 910         /*
 911          * disk space consumed by the extent, checksum blocks are included
 912          * in these numbers
 913          */
 914         __le64 disk_bytenr;
 915         __le64 disk_num_bytes;
 916         /*
 917          * the logical offset in file blocks (no csums)
 918          * this extent record is for.  This allows a file extent to point
 919          * into the middle of an existing extent on disk, sharing it
 920          * between two snapshots (useful if some bytes in the middle of the
 921          * extent have changed
 922          */
 923         __le64 offset;
 924         /*
 925          * the logical number of file blocks (no csums included)
 926          */
 927         __le64 num_bytes;
 928
 929 } __attribute__ ((__packed__));
 930
 931 struct btrfs_dev_stats_item {
 932         /*
 933          * grow this item struct at the end for future enhancements and keep
 934          * the existing values unchanged
 935          */
 936         __le64 values[BTRFS_DEV_STAT_VALUES_MAX];
 937 } __attribute__ ((__packed__));
 938
 939 struct btrfs_csum_item {
 940         u8 csum;
 941 } __attribute__ ((__packed__));
 942
 943 /*
 944  * We don't want to overwrite 1M at the beginning of device, even though
 945  * there is our 1st superblock at 64k. Some possible reasons:
 946  *  - the first 64k blank is useful for some boot loader/manager
 947  *  - the first 1M could be scratched by buggy partitioner or somesuch
 948  */
 949 #define BTRFS_BLOCK_RESERVED_1M_FOR_SUPER       ((u64)SZ_1M)
 950
 951 /* tag for the radix tree of block groups in ram */
 952 #define BTRFS_BLOCK_GROUP_DATA          (1ULL << 0)
 953 #define BTRFS_BLOCK_GROUP_SYSTEM        (1ULL << 1)
 954 #define BTRFS_BLOCK_GROUP_METADATA      (1ULL << 2)
 955 #define BTRFS_BLOCK_GROUP_RAID0         (1ULL << 3)
 956 #define BTRFS_BLOCK_GROUP_RAID1         (1ULL << 4)
 957 #define BTRFS_BLOCK_GROUP_DUP           (1ULL << 5)
 958 #define BTRFS_BLOCK_GROUP_RAID10        (1ULL << 6)
 959 #define BTRFS_BLOCK_GROUP_RAID5         (1ULL << 7)
 960 #define BTRFS_BLOCK_GROUP_RAID6         (1ULL << 8)
 961 #define BTRFS_BLOCK_GROUP_RESERVED      BTRFS_AVAIL_ALLOC_BIT_SINGLE
 962
 963 enum btrfs_raid_types {
 964         BTRFS_RAID_RAID10,
 965         BTRFS_RAID_RAID1,
 966         BTRFS_RAID_DUP,
 967         BTRFS_RAID_RAID0,
 968         BTRFS_RAID_SINGLE,
 969         BTRFS_RAID_RAID5,
 970         BTRFS_RAID_RAID6,
 971         BTRFS_NR_RAID_TYPES
 972 };
 973
 974 #define BTRFS_BLOCK_GROUP_TYPE_MASK     (BTRFS_BLOCK_GROUP_DATA |    \
 975                                          BTRFS_BLOCK_GROUP_SYSTEM |  \
 976                                          BTRFS_BLOCK_GROUP_METADATA)
 977
 978 #define BTRFS_BLOCK_GROUP_PROFILE_MASK  (BTRFS_BLOCK_GROUP_RAID0 |   \
 979                                          BTRFS_BLOCK_GROUP_RAID1 |   \
 980                                          BTRFS_BLOCK_GROUP_RAID5 |   \
 981                                          BTRFS_BLOCK_GROUP_RAID6 |   \
 982                                          BTRFS_BLOCK_GROUP_DUP |     \
 983                                          BTRFS_BLOCK_GROUP_RAID10)
 984
 985 /* used in struct btrfs_balance_args fields */
 986 #define BTRFS_AVAIL_ALLOC_BIT_SINGLE    (1ULL << 48)
 987
 988 /*
 989  * GLOBAL_RSV does not exist as a on-disk block group type and is used
 990  * internally for exporting info about global block reserve from space infos
 991  */
 992 #define BTRFS_SPACE_INFO_GLOBAL_RSV    (1ULL << 49)
 993
 994 #define BTRFS_QGROUP_LEVEL_SHIFT                48
 995
 996 static inline u64 btrfs_qgroup_level(u64 qgroupid)
 997 {
 998         return qgroupid >> BTRFS_QGROUP_LEVEL_SHIFT;
 999 }
1000
1001 static inline u64 btrfs_qgroup_subvid(u64 qgroupid)
1002 {
1003         return qgroupid & ((1ULL << BTRFS_QGROUP_LEVEL_SHIFT) - 1);
1004 }
1005
1006 #define BTRFS_QGROUP_STATUS_FLAG_ON             (1ULL << 0)
1007 #define BTRFS_QGROUP_STATUS_FLAG_RESCAN         (1ULL << 1)
1008 #define BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT   (1ULL << 2)
1009
1010 struct btrfs_qgroup_status_item {
1011         __le64 version;
1012         __le64 generation;
1013         __le64 flags;
1014         __le64 rescan;          /* progress during scanning */
1015 } __attribute__ ((__packed__));
1016
1017 struct btrfs_block_group_item {
1018         __le64 used;
1019         __le64 chunk_objectid;
1020         __le64 flags;
1021 } __attribute__ ((__packed__));
1022
1023 struct btrfs_free_space_info {
1024         __le32 extent_count;
1025         __le32 flags;
1026 } __attribute__ ((__packed__));
1027
1028 #define BTRFS_FREE_SPACE_USING_BITMAPS (1ULL << 0)
1029
1030 struct btrfs_qgroup_info_item {
1031         __le64 generation;
1032         __le64 referenced;
1033         __le64 referenced_compressed;
1034         __le64 exclusive;
1035         __le64 exclusive_compressed;
1036 } __attribute__ ((__packed__));
1037
1038 /* flags definition for qgroup limits */
1039 #define BTRFS_QGROUP_LIMIT_MAX_RFER     (1ULL << 0)
1040 #define BTRFS_QGROUP_LIMIT_MAX_EXCL     (1ULL << 1)
1041 #define BTRFS_QGROUP_LIMIT_RSV_RFER     (1ULL << 2)
1042 #define BTRFS_QGROUP_LIMIT_RSV_EXCL     (1ULL << 3)
1043 #define BTRFS_QGROUP_LIMIT_RFER_CMPR    (1ULL << 4)
1044 #define BTRFS_QGROUP_LIMIT_EXCL_CMPR    (1ULL << 5)
1045
1046 struct btrfs_qgroup_limit_item {
1047         __le64 flags;
1048         __le64 max_referenced;
1049         __le64 max_exclusive;
1050         __le64 rsv_referenced;
1051         __le64 rsv_exclusive;
1052 } __attribute__ ((__packed__));
1053
1054 struct btrfs_space_info {
1055         u64 flags;
1056         u64 total_bytes;
1057         u64 bytes_used;
1058         u64 bytes_pinned;
1059         int full;
1060         struct list_head list;
1061 };
1062
1063 struct btrfs_block_group_cache {
1064         struct cache_extent cache;
1065         struct btrfs_key key;
1066         struct btrfs_block_group_item item;
1067         struct btrfs_space_info *space_info;
1068         struct btrfs_free_space_ctl *free_space_ctl;
1069         u64 bytes_super;
1070         u64 pinned;
1071         u64 flags;
1072         int cached;
1073         int ro;
1074 };
1075
1076 struct btrfs_device;
1077 struct btrfs_fs_devices;
1078 struct btrfs_fs_info {
1079         u8 fsid[BTRFS_FSID_SIZE];
1080         u8 *new_fsid;
1081         u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
1082         u8 *new_chunk_tree_uuid;
1083         struct btrfs_root *fs_root;
1084         struct btrfs_root *extent_root;
1085         struct btrfs_root *tree_root;
1086         struct btrfs_root *chunk_root;
1087         struct btrfs_root *dev_root;
1088         struct btrfs_root *csum_root;
1089         struct btrfs_root *quota_root;
1090         struct btrfs_root *free_space_root;
1091
1092         struct rb_root fs_root_tree;
1093
1094         /* the log root tree is a directory of all the other log roots */
1095         struct btrfs_root *log_root_tree;
1096
1097         struct extent_io_tree extent_cache;
1098         struct extent_io_tree free_space_cache;
1099         struct extent_io_tree block_group_cache;
1100         struct extent_io_tree pinned_extents;
1101         struct extent_io_tree pending_del;
1102         struct extent_io_tree extent_ins;
1103         struct extent_io_tree *excluded_extents;
1104
1105         /* logical->physical extent mapping */
1106         struct btrfs_mapping_tree mapping_tree;
1107
1108         u64 generation;
1109         u64 last_trans_committed;
1110
1111         u64 avail_data_alloc_bits;
1112         u64 avail_metadata_alloc_bits;
1113         u64 avail_system_alloc_bits;
1114         u64 data_alloc_profile;
1115         u64 metadata_alloc_profile;
1116         u64 system_alloc_profile;
1117         u64 alloc_start;
1118
1119         struct btrfs_trans_handle *running_transaction;
1120         struct btrfs_super_block *super_copy;
1121         struct mutex fs_mutex;
1122
1123         u64 super_bytenr;
1124         u64 total_pinned;
1125
1126         struct list_head dirty_cowonly_roots;
1127         struct list_head recow_ebs;
1128
1129         struct btrfs_fs_devices *fs_devices;
1130         struct list_head space_info;
1131
1132         unsigned int system_allocs:1;
1133         unsigned int readonly:1;
1134         unsigned int on_restoring:1;
1135         unsigned int is_chunk_recover:1;
1136         unsigned int quota_enabled:1;
1137         unsigned int suppress_check_block_errors:1;
1138         unsigned int ignore_fsid_mismatch:1;
1139         unsigned int ignore_chunk_tree_error:1;
1140         unsigned int avoid_meta_chunk_alloc:1;
1141         unsigned int avoid_sys_chunk_alloc:1;
1142         unsigned int finalize_on_close:1;
1143
1144         int transaction_aborted;
1145
1146         int (*free_extent_hook)(struct btrfs_trans_handle *trans,
1147                                 struct btrfs_root *root,
1148                                 u64 bytenr, u64 num_bytes, u64 parent,
1149                                 u64 root_objectid, u64 owner, u64 offset,
1150                                 int refs_to_drop);
1151         struct cache_tree *fsck_extent_cache;
1152         struct cache_tree *corrupt_blocks;
1153
1154         /* Cached block sizes */
1155         u32 nodesize;
1156         u32 sectorsize;
1157         u32 stripesize;
1158 };
1159
1160 /*
1161  * in ram representation of the tree.  extent_root is used for all allocations
1162  * and for the extent tree extent_root root.
1163  */
1164 struct btrfs_root {
1165         struct extent_buffer *node;
1166         struct extent_buffer *commit_root;
1167         struct btrfs_root_item root_item;
1168         struct btrfs_key root_key;
1169         struct btrfs_fs_info *fs_info;
1170         u64 objectid;
1171         u64 last_trans;
1172
1173         int ref_cows;
1174         int track_dirty;
1175
1176
1177         u32 type;
1178         u64 last_inode_alloc;
1179
1180         /*
1181          * Record orphan data extent ref
1182          *
1183          * TODO: Don't restore things in btrfs_root.
1184          * Directly record it into inode_record, which needs a lot of
1185          * infrastructure change to allow cooperation between extent
1186          * and fs tree scan.
1187          */
1188         struct list_head orphan_data_extents;
1189
1190         /* the dirty list is only used by non-reference counted roots */
1191         struct list_head dirty_list;
1192         struct rb_node rb_node;
1193 };
1194
1195 static inline u32 BTRFS_MAX_ITEM_SIZE(const struct btrfs_fs_info *info)
1196 {
1197         return BTRFS_LEAF_DATA_SIZE(info) - sizeof(struct btrfs_item);
1198 }
1199
1200 static inline u32 BTRFS_NODEPTRS_PER_BLOCK(const struct btrfs_fs_info *info)
1201 {
1202         return BTRFS_LEAF_DATA_SIZE(info) / sizeof(struct btrfs_key_ptr);
1203 }
1204
1205 static inline u32 BTRFS_NODEPTRS_PER_EXTENT_BUFFER(const struct extent_buffer *eb)
1206 {
1207         BUG_ON(eb->fs_info && eb->fs_info->nodesize != eb->len);
1208         return __BTRFS_LEAF_DATA_SIZE(eb->len) / sizeof(struct btrfs_key_ptr);
1209 }
1210
1211 #define BTRFS_FILE_EXTENT_INLINE_DATA_START             \
1212         (offsetof(struct btrfs_file_extent_item, disk_bytenr))
1213 static inline u32 BTRFS_MAX_INLINE_DATA_SIZE(const struct btrfs_fs_info *info)
1214 {
1215         return BTRFS_MAX_ITEM_SIZE(info) -
1216                 BTRFS_FILE_EXTENT_INLINE_DATA_START;
1217 }
1218
1219 static inline u32 BTRFS_MAX_XATTR_SIZE(const struct btrfs_fs_info *info)
1220 {
1221         return BTRFS_MAX_ITEM_SIZE(info) - sizeof(struct btrfs_dir_item);
1222 }
1223
1224 /*
1225  * inode items have the data typically returned from stat and store other
1226  * info about object characteristics.  There is one for every file and dir in
1227  * the FS
1228  */
1229 #define BTRFS_INODE_ITEM_KEY            1
1230 #define BTRFS_INODE_REF_KEY             12
1231 #define BTRFS_INODE_EXTREF_KEY          13
1232 #define BTRFS_XATTR_ITEM_KEY            24
1233 #define BTRFS_ORPHAN_ITEM_KEY           48
1234
1235 #define BTRFS_DIR_LOG_ITEM_KEY  60
1236 #define BTRFS_DIR_LOG_INDEX_KEY 72
1237 /*
1238  * dir items are the name -> inode pointers in a directory.  There is one
1239  * for every name in a directory.
1240  */
1241 #define BTRFS_DIR_ITEM_KEY      84
1242 #define BTRFS_DIR_INDEX_KEY     96
1243
1244 /*
1245  * extent data is for file data
1246  */
1247 #define BTRFS_EXTENT_DATA_KEY   108
1248
1249 /*
1250  * csum items have the checksums for data in the extents
1251  */
1252 #define BTRFS_CSUM_ITEM_KEY     120
1253 /*
1254  * extent csums are stored in a separate tree and hold csums for
1255  * an entire extent on disk.
1256  */
1257 #define BTRFS_EXTENT_CSUM_KEY   128
1258
1259 /*
1260  * root items point to tree roots.  There are typically in the root
1261  * tree used by the super block to find all the other trees
1262  */
1263 #define BTRFS_ROOT_ITEM_KEY     132
1264
1265 /*
1266  * root backrefs tie subvols and snapshots to the directory entries that
1267  * reference them
1268  */
1269 #define BTRFS_ROOT_BACKREF_KEY  144
1270
1271 /*
1272  * root refs make a fast index for listing all of the snapshots and
1273  * subvolumes referenced by a given root.  They point directly to the
1274  * directory item in the root that references the subvol
1275  */
1276 #define BTRFS_ROOT_REF_KEY      156
1277
1278 /*
1279  * extent items are in the extent map tree.  These record which blocks
1280  * are used, and how many references there are to each block
1281  */
1282 #define BTRFS_EXTENT_ITEM_KEY   168
1283
1284 /*
1285  * The same as the BTRFS_EXTENT_ITEM_KEY, except it's metadata we already know
1286  * the length, so we save the level in key->offset instead of the length.
1287  */
1288 #define BTRFS_METADATA_ITEM_KEY 169
1289
1290 #define BTRFS_TREE_BLOCK_REF_KEY        176
1291
1292 #define BTRFS_EXTENT_DATA_REF_KEY       178
1293
1294 /* old style extent backrefs */
1295 #define BTRFS_EXTENT_REF_V0_KEY         180
1296
1297 #define BTRFS_SHARED_BLOCK_REF_KEY      182
1298
1299 #define BTRFS_SHARED_DATA_REF_KEY       184
1300
1301
1302 /*
1303  * block groups give us hints into the extent allocation trees.  Which
1304  * blocks are free etc etc
1305  */
1306 #define BTRFS_BLOCK_GROUP_ITEM_KEY 192
1307
1308 /*
1309  * Every block group is represented in the free space tree by a free space info
1310  * item, which stores some accounting information. It is keyed on
1311  * (block_group_start, FREE_SPACE_INFO, block_group_length).
1312  */
1313 #define BTRFS_FREE_SPACE_INFO_KEY 198
1314
1315 /*
1316  * A free space extent tracks an extent of space that is free in a block group.
1317  * It is keyed on (start, FREE_SPACE_EXTENT, length).
1318  */
1319 #define BTRFS_FREE_SPACE_EXTENT_KEY 199
1320
1321 /*
1322  * When a block group becomes very fragmented, we convert it to use bitmaps
1323  * instead of extents. A free space bitmap is keyed on
1324  * (start, FREE_SPACE_BITMAP, length); the corresponding item is a bitmap with
1325  * (length / sectorsize) bits.
1326  */
1327 #define BTRFS_FREE_SPACE_BITMAP_KEY 200
1328
1329 #define BTRFS_DEV_EXTENT_KEY    204
1330 #define BTRFS_DEV_ITEM_KEY      216
1331 #define BTRFS_CHUNK_ITEM_KEY    228
1332
1333 #define BTRFS_BALANCE_ITEM_KEY  248
1334
1335 /*
1336  * quota groups
1337  */
1338 #define BTRFS_QGROUP_STATUS_KEY         240
1339 #define BTRFS_QGROUP_INFO_KEY           242
1340 #define BTRFS_QGROUP_LIMIT_KEY          244
1341 #define BTRFS_QGROUP_RELATION_KEY       246
1342
1343 /*
1344  * Obsolete name, see BTRFS_TEMPORARY_ITEM_KEY.
1345  */
1346 #define BTRFS_BALANCE_ITEM_KEY  248
1347
1348 /*
1349  * The key type for tree items that are stored persistently, but do not need to
1350  * exist for extended period of time. The items can exist in any tree.
1351  *
1352  * [subtype, BTRFS_TEMPORARY_ITEM_KEY, data]
1353  *
1354  * Existing items:
1355  *
1356  * - balance status item
1357  *   (BTRFS_BALANCE_OBJECTID, BTRFS_TEMPORARY_ITEM_KEY, 0)
1358  */
1359 #define BTRFS_TEMPORARY_ITEM_KEY        248
1360
1361 /*
1362  * Obsolete name, see BTRFS_PERSISTENT_ITEM_KEY
1363  */
1364 #define BTRFS_DEV_STATS_KEY             249
1365
1366 /*
1367  * The key type for tree items that are stored persistently and usually exist
1368  * for a long period, eg. filesystem lifetime. The item kinds can be status
1369  * information, stats or preference values. The item can exist in any tree.
1370  *
1371  * [subtype, BTRFS_PERSISTENT_ITEM_KEY, data]
1372  *
1373  * Existing items:
1374  *
1375  * - device statistics, store IO stats in the device tree, one key for all
1376  *   stats
1377  *   (BTRFS_DEV_STATS_OBJECTID, BTRFS_DEV_STATS_KEY, 0)
1378  */
1379 #define BTRFS_PERSISTENT_ITEM_KEY       249
1380
1381 /*
1382  * Persistently stores the device replace state in the device tree.
1383  * The key is built like this: (0, BTRFS_DEV_REPLACE_KEY, 0).
1384  */
1385 #define BTRFS_DEV_REPLACE_KEY   250
1386
1387 /*
1388  * Stores items that allow to quickly map UUIDs to something else.
1389  * These items are part of the filesystem UUID tree.
1390  * The key is built like this:
1391  * (UUID_upper_64_bits, BTRFS_UUID_KEY*, UUID_lower_64_bits).
1392  */
1393 #if BTRFS_UUID_SIZE != 16
1394 #error "UUID items require BTRFS_UUID_SIZE == 16!"
1395 #endif
1396 #define BTRFS_UUID_KEY_SUBVOL   251     /* for UUIDs assigned to subvols */
1397 #define BTRFS_UUID_KEY_RECEIVED_SUBVOL  252     /* for UUIDs assigned to
1398                                                  * received subvols */
1399
1400 /*
1401  * string items are for debugging.  They just store a short string of
1402  * data in the FS
1403  */
1404 #define BTRFS_STRING_ITEM_KEY   253
1405 /*
1406  * Inode flags
1407  */
1408 #define BTRFS_INODE_NODATASUM           (1 << 0)
1409 #define BTRFS_INODE_NODATACOW           (1 << 1)
1410 #define BTRFS_INODE_READONLY            (1 << 2)
1411 #define BTRFS_INODE_NOCOMPRESS          (1 << 3)
1412 #define BTRFS_INODE_PREALLOC            (1 << 4)
1413 #define BTRFS_INODE_SYNC                (1 << 5)
1414 #define BTRFS_INODE_IMMUTABLE           (1 << 6)
1415 #define BTRFS_INODE_APPEND              (1 << 7)
1416 #define BTRFS_INODE_NODUMP              (1 << 8)
1417 #define BTRFS_INODE_NOATIME             (1 << 9)
1418 #define BTRFS_INODE_DIRSYNC             (1 << 10)
1419 #define BTRFS_INODE_COMPRESS            (1 << 11)
1420
1421 #define read_eb_member(eb, ptr, type, member, result) (                 \
1422         read_extent_buffer(eb, (char *)(result),                        \
1423                            ((unsigned long)(ptr)) +                     \
1424                             offsetof(type, member),                     \
1425                            sizeof(((type *)0)->member)))
1426
1427 #define write_eb_member(eb, ptr, type, member, result) (                \
1428         write_extent_buffer(eb, (char *)(result),                       \
1429                            ((unsigned long)(ptr)) +                     \
1430                             offsetof(type, member),                     \
1431                            sizeof(((type *)0)->member)))
1432
1433 #define BTRFS_SETGET_HEADER_FUNCS(name, type, member, bits)             \
1434 static inline u##bits btrfs_##name(const struct extent_buffer *eb)      \
1435 {                                                                       \
1436         const struct btrfs_header *h = (struct btrfs_header *)eb->data; \
1437         return le##bits##_to_cpu(h->member);                            \
1438 }                                                                       \
1439 static inline void btrfs_set_##name(struct extent_buffer *eb,           \
1440                                     u##bits val)                        \
1441 {                                                                       \
1442         struct btrfs_header *h = (struct btrfs_header *)eb->data;       \
1443         h->member = cpu_to_le##bits(val);                               \
1444 }
1445
1446 #define BTRFS_SETGET_FUNCS(name, type, member, bits)                    \
1447 static inline u##bits btrfs_##name(const struct extent_buffer *eb,      \
1448                                    const type *s)                       \
1449 {                                                                       \
1450         unsigned long offset = (unsigned long)s;                        \
1451         const type *p = (type *) (eb->data + offset);                   \
1452         return get_unaligned_le##bits(&p->member);                      \
1453 }                                                                       \
1454 static inline void btrfs_set_##name(struct extent_buffer *eb,           \
1455                                     type *s, u##bits val)               \
1456 {                                                                       \
1457         unsigned long offset = (unsigned long)s;                        \
1458         type *p = (type *) (eb->data + offset);                         \
1459         put_unaligned_le##bits(val, &p->member);                        \
1460 }
1461
1462 #define BTRFS_SETGET_STACK_FUNCS(name, type, member, bits)              \
1463 static inline u##bits btrfs_##name(const type *s)                       \
1464 {                                                                       \
1465         return le##bits##_to_cpu(s->member);                            \
1466 }                                                                       \
1467 static inline void btrfs_set_##name(type *s, u##bits val)               \
1468 {                                                                       \
1469         s->member = cpu_to_le##bits(val);                               \
1470 }
1471
1472 BTRFS_SETGET_FUNCS(device_type, struct btrfs_dev_item, type, 64);
1473 BTRFS_SETGET_FUNCS(device_total_bytes, struct btrfs_dev_item, total_bytes, 64);
1474 BTRFS_SETGET_FUNCS(device_bytes_used, struct btrfs_dev_item, bytes_used, 64);
1475 BTRFS_SETGET_FUNCS(device_io_align, struct btrfs_dev_item, io_align, 32);
1476 BTRFS_SETGET_FUNCS(device_io_width, struct btrfs_dev_item, io_width, 32);
1477 BTRFS_SETGET_FUNCS(device_start_offset, struct btrfs_dev_item,
1478                    start_offset, 64);
1479 BTRFS_SETGET_FUNCS(device_sector_size, struct btrfs_dev_item, sector_size, 32);
1480 BTRFS_SETGET_FUNCS(device_id, struct btrfs_dev_item, devid, 64);
1481 BTRFS_SETGET_FUNCS(device_group, struct btrfs_dev_item, dev_group, 32);
1482 BTRFS_SETGET_FUNCS(device_seek_speed, struct btrfs_dev_item, seek_speed, 8);
1483 BTRFS_SETGET_FUNCS(device_bandwidth, struct btrfs_dev_item, bandwidth, 8);
1484 BTRFS_SETGET_FUNCS(device_generation, struct btrfs_dev_item, generation, 64);
1485
1486 BTRFS_SETGET_STACK_FUNCS(stack_device_type, struct btrfs_dev_item, type, 64);
1487 BTRFS_SETGET_STACK_FUNCS(stack_device_total_bytes, struct btrfs_dev_item,
1488                          total_bytes, 64);
1489 BTRFS_SETGET_STACK_FUNCS(stack_device_bytes_used, struct btrfs_dev_item,
1490                          bytes_used, 64);
1491 BTRFS_SETGET_STACK_FUNCS(stack_device_io_align, struct btrfs_dev_item,
1492                          io_align, 32);
1493 BTRFS_SETGET_STACK_FUNCS(stack_device_io_width, struct btrfs_dev_item,
1494                          io_width, 32);
1495 BTRFS_SETGET_STACK_FUNCS(stack_device_sector_size, struct btrfs_dev_item,
1496                          sector_size, 32);
1497 BTRFS_SETGET_STACK_FUNCS(stack_device_id, struct btrfs_dev_item, devid, 64);
1498 BTRFS_SETGET_STACK_FUNCS(stack_device_group, struct btrfs_dev_item,
1499                          dev_group, 32);
1500 BTRFS_SETGET_STACK_FUNCS(stack_device_seek_speed, struct btrfs_dev_item,
1501                          seek_speed, 8);
1502 BTRFS_SETGET_STACK_FUNCS(stack_device_bandwidth, struct btrfs_dev_item,
1503                          bandwidth, 8);
1504 BTRFS_SETGET_STACK_FUNCS(stack_device_generation, struct btrfs_dev_item,
1505                          generation, 64);
1506
1507 static inline char *btrfs_device_uuid(struct btrfs_dev_item *d)
1508 {
1509         return (char *)d + offsetof(struct btrfs_dev_item, uuid);
1510 }
1511
1512 static inline char *btrfs_device_fsid(struct btrfs_dev_item *d)
1513 {
1514         return (char *)d + offsetof(struct btrfs_dev_item, fsid);
1515 }
1516
1517 BTRFS_SETGET_FUNCS(chunk_length, struct btrfs_chunk, length, 64);
1518 BTRFS_SETGET_FUNCS(chunk_owner, struct btrfs_chunk, owner, 64);
1519 BTRFS_SETGET_FUNCS(chunk_stripe_len, struct btrfs_chunk, stripe_len, 64);
1520 BTRFS_SETGET_FUNCS(chunk_io_align, struct btrfs_chunk, io_align, 32);
1521 BTRFS_SETGET_FUNCS(chunk_io_width, struct btrfs_chunk, io_width, 32);
1522 BTRFS_SETGET_FUNCS(chunk_sector_size, struct btrfs_chunk, sector_size, 32);
1523 BTRFS_SETGET_FUNCS(chunk_type, struct btrfs_chunk, type, 64);
1524 BTRFS_SETGET_FUNCS(chunk_num_stripes, struct btrfs_chunk, num_stripes, 16);
1525 BTRFS_SETGET_FUNCS(chunk_sub_stripes, struct btrfs_chunk, sub_stripes, 16);
1526 BTRFS_SETGET_FUNCS(stripe_devid, struct btrfs_stripe, devid, 64);
1527 BTRFS_SETGET_FUNCS(stripe_offset, struct btrfs_stripe, offset, 64);
1528
1529 static inline char *btrfs_stripe_dev_uuid(struct btrfs_stripe *s)
1530 {
1531         return (char *)s + offsetof(struct btrfs_stripe, dev_uuid);
1532 }
1533
1534 BTRFS_SETGET_STACK_FUNCS(stack_chunk_length, struct btrfs_chunk, length, 64);
1535 BTRFS_SETGET_STACK_FUNCS(stack_chunk_owner, struct btrfs_chunk, owner, 64);
1536 BTRFS_SETGET_STACK_FUNCS(stack_chunk_stripe_len, struct btrfs_chunk,
1537                          stripe_len, 64);
1538 BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_align, struct btrfs_chunk,
1539                          io_align, 32);
1540 BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_width, struct btrfs_chunk,
1541                          io_width, 32);
1542 BTRFS_SETGET_STACK_FUNCS(stack_chunk_sector_size, struct btrfs_chunk,
1543                          sector_size, 32);
1544 BTRFS_SETGET_STACK_FUNCS(stack_chunk_type, struct btrfs_chunk, type, 64);
1545 BTRFS_SETGET_STACK_FUNCS(stack_chunk_num_stripes, struct btrfs_chunk,
1546                          num_stripes, 16);
1547 BTRFS_SETGET_STACK_FUNCS(stack_chunk_sub_stripes, struct btrfs_chunk,
1548                          sub_stripes, 16);
1549 BTRFS_SETGET_STACK_FUNCS(stack_stripe_devid, struct btrfs_stripe, devid, 64);
1550 BTRFS_SETGET_STACK_FUNCS(stack_stripe_offset, struct btrfs_stripe, offset, 64);
1551
1552 static inline struct btrfs_stripe *btrfs_stripe_nr(struct btrfs_chunk *c,
1553                                                    int nr)
1554 {
1555         unsigned long offset = (unsigned long)c;
1556         offset += offsetof(struct btrfs_chunk, stripe);
1557         offset += nr * sizeof(struct btrfs_stripe);
1558         return (struct btrfs_stripe *)offset;
1559 }
1560
1561 static inline char *btrfs_stripe_dev_uuid_nr(struct btrfs_chunk *c, int nr)
1562 {
1563         return btrfs_stripe_dev_uuid(btrfs_stripe_nr(c, nr));
1564 }
1565
1566 static inline u64 btrfs_stripe_offset_nr(struct extent_buffer *eb,
1567                                          struct btrfs_chunk *c, int nr)
1568 {
1569         return btrfs_stripe_offset(eb, btrfs_stripe_nr(c, nr));
1570 }
1571
1572 static inline void btrfs_set_stripe_offset_nr(struct extent_buffer *eb,
1573                                              struct btrfs_chunk *c, int nr,
1574                                              u64 val)
1575 {
1576         btrfs_set_stripe_offset(eb, btrfs_stripe_nr(c, nr), val);
1577 }
1578
1579 static inline u64 btrfs_stripe_devid_nr(struct extent_buffer *eb,
1580                                          struct btrfs_chunk *c, int nr)
1581 {
1582         return btrfs_stripe_devid(eb, btrfs_stripe_nr(c, nr));
1583 }
1584
1585 static inline void btrfs_set_stripe_devid_nr(struct extent_buffer *eb,
1586                                              struct btrfs_chunk *c, int nr,
1587                                              u64 val)
1588 {
1589         btrfs_set_stripe_devid(eb, btrfs_stripe_nr(c, nr), val);
1590 }
1591
1592 /* struct btrfs_block_group_item */
1593 BTRFS_SETGET_STACK_FUNCS(block_group_used, struct btrfs_block_group_item,
1594                          used, 64);
1595 BTRFS_SETGET_FUNCS(disk_block_group_used, struct btrfs_block_group_item,
1596                          used, 64);
1597 BTRFS_SETGET_STACK_FUNCS(block_group_chunk_objectid,
1598                         struct btrfs_block_group_item, chunk_objectid, 64);
1599
1600 BTRFS_SETGET_FUNCS(disk_block_group_chunk_objectid,
1601                    struct btrfs_block_group_item, chunk_objectid, 64);
1602 BTRFS_SETGET_FUNCS(disk_block_group_flags,
1603                    struct btrfs_block_group_item, flags, 64);
1604 BTRFS_SETGET_STACK_FUNCS(block_group_flags,
1605                         struct btrfs_block_group_item, flags, 64);
1606
1607 /* struct btrfs_free_space_info */
1608 BTRFS_SETGET_FUNCS(free_space_extent_count, struct btrfs_free_space_info,
1609                    extent_count, 32);
1610 BTRFS_SETGET_FUNCS(free_space_flags, struct btrfs_free_space_info, flags, 32);
1611
1612 /* struct btrfs_inode_ref */
1613 BTRFS_SETGET_FUNCS(inode_ref_name_len, struct btrfs_inode_ref, name_len, 16);
1614 BTRFS_SETGET_STACK_FUNCS(stack_inode_ref_name_len, struct btrfs_inode_ref, name_len, 16);
1615 BTRFS_SETGET_FUNCS(inode_ref_index, struct btrfs_inode_ref, index, 64);
1616
1617 /* struct btrfs_inode_extref */
1618 BTRFS_SETGET_FUNCS(inode_extref_parent, struct btrfs_inode_extref,
1619                    parent_objectid, 64);
1620 BTRFS_SETGET_FUNCS(inode_extref_name_len, struct btrfs_inode_extref,
1621                    name_len, 16);
1622 BTRFS_SETGET_FUNCS(inode_extref_index, struct btrfs_inode_extref, index, 64);
1623
1624 /* struct btrfs_inode_item */
1625 BTRFS_SETGET_FUNCS(inode_generation, struct btrfs_inode_item, generation, 64);
1626 BTRFS_SETGET_FUNCS(inode_sequence, struct btrfs_inode_item, sequence, 64);
1627 BTRFS_SETGET_FUNCS(inode_transid, struct btrfs_inode_item, transid, 64);
1628 BTRFS_SETGET_FUNCS(inode_size, struct btrfs_inode_item, size, 64);
1629 BTRFS_SETGET_FUNCS(inode_nbytes, struct btrfs_inode_item, nbytes, 64);
1630 BTRFS_SETGET_FUNCS(inode_block_group, struct btrfs_inode_item, block_group, 64);
1631 BTRFS_SETGET_FUNCS(inode_nlink, struct btrfs_inode_item, nlink, 32);
1632 BTRFS_SETGET_FUNCS(inode_uid, struct btrfs_inode_item, uid, 32);
1633 BTRFS_SETGET_FUNCS(inode_gid, struct btrfs_inode_item, gid, 32);
1634 BTRFS_SETGET_FUNCS(inode_mode, struct btrfs_inode_item, mode, 32);
1635 BTRFS_SETGET_FUNCS(inode_rdev, struct btrfs_inode_item, rdev, 64);
1636 BTRFS_SETGET_FUNCS(inode_flags, struct btrfs_inode_item, flags, 64);
1637
1638 BTRFS_SETGET_STACK_FUNCS(stack_inode_generation,
1639                          struct btrfs_inode_item, generation, 64);
1640 BTRFS_SETGET_STACK_FUNCS(stack_inode_sequence,
1641                          struct btrfs_inode_item, sequence, 64);
1642 BTRFS_SETGET_STACK_FUNCS(stack_inode_transid,
1643                          struct btrfs_inode_item, transid, 64);
1644 BTRFS_SETGET_STACK_FUNCS(stack_inode_size,
1645                          struct btrfs_inode_item, size, 64);
1646 BTRFS_SETGET_STACK_FUNCS(stack_inode_nbytes,
1647                          struct btrfs_inode_item, nbytes, 64);
1648 BTRFS_SETGET_STACK_FUNCS(stack_inode_block_group,
1649                          struct btrfs_inode_item, block_group, 64);
1650 BTRFS_SETGET_STACK_FUNCS(stack_inode_nlink,
1651                          struct btrfs_inode_item, nlink, 32);
1652 BTRFS_SETGET_STACK_FUNCS(stack_inode_uid,
1653                          struct btrfs_inode_item, uid, 32);
1654 BTRFS_SETGET_STACK_FUNCS(stack_inode_gid,
1655                          struct btrfs_inode_item, gid, 32);
1656 BTRFS_SETGET_STACK_FUNCS(stack_inode_mode,
1657                          struct btrfs_inode_item, mode, 32);
1658 BTRFS_SETGET_STACK_FUNCS(stack_inode_rdev,
1659                          struct btrfs_inode_item, rdev, 64);
1660 BTRFS_SETGET_STACK_FUNCS(stack_inode_flags,
1661                          struct btrfs_inode_item, flags, 64);
1662
1663 static inline struct btrfs_timespec *
1664 btrfs_inode_atime(struct btrfs_inode_item *inode_item)
1665 {
1666         unsigned long ptr = (unsigned long)inode_item;
1667         ptr += offsetof(struct btrfs_inode_item, atime);
1668         return (struct btrfs_timespec *)ptr;
1669 }
1670
1671 static inline struct btrfs_timespec *
1672 btrfs_inode_mtime(struct btrfs_inode_item *inode_item)
1673 {
1674         unsigned long ptr = (unsigned long)inode_item;
1675         ptr += offsetof(struct btrfs_inode_item, mtime);
1676         return (struct btrfs_timespec *)ptr;
1677 }
1678
1679 static inline struct btrfs_timespec *
1680 btrfs_inode_ctime(struct btrfs_inode_item *inode_item)
1681 {
1682         unsigned long ptr = (unsigned long)inode_item;
1683         ptr += offsetof(struct btrfs_inode_item, ctime);
1684         return (struct btrfs_timespec *)ptr;
1685 }
1686
1687 static inline struct btrfs_timespec *
1688 btrfs_inode_otime(struct btrfs_inode_item *inode_item)
1689 {
1690         unsigned long ptr = (unsigned long)inode_item;
1691         ptr += offsetof(struct btrfs_inode_item, otime);
1692         return (struct btrfs_timespec *)ptr;
1693 }
1694
1695 BTRFS_SETGET_FUNCS(timespec_sec, struct btrfs_timespec, sec, 64);
1696 BTRFS_SETGET_FUNCS(timespec_nsec, struct btrfs_timespec, nsec, 32);
1697 BTRFS_SETGET_STACK_FUNCS(stack_timespec_sec, struct btrfs_timespec,
1698                          sec, 64);
1699 BTRFS_SETGET_STACK_FUNCS(stack_timespec_nsec, struct btrfs_timespec,
1700                          nsec, 32);
1701
1702 /* struct btrfs_dev_extent */
1703 BTRFS_SETGET_FUNCS(dev_extent_chunk_tree, struct btrfs_dev_extent,
1704                    chunk_tree, 64);
1705 BTRFS_SETGET_FUNCS(dev_extent_chunk_objectid, struct btrfs_dev_extent,
1706                    chunk_objectid, 64);
1707 BTRFS_SETGET_FUNCS(dev_extent_chunk_offset, struct btrfs_dev_extent,
1708                    chunk_offset, 64);
1709 BTRFS_SETGET_FUNCS(dev_extent_length, struct btrfs_dev_extent, length, 64);
1710
1711 BTRFS_SETGET_STACK_FUNCS(stack_dev_extent_length, struct btrfs_dev_extent,
1712                          length, 64);
1713
1714 static inline u8 *btrfs_dev_extent_chunk_tree_uuid(struct btrfs_dev_extent *dev)
1715 {
1716         unsigned long ptr = offsetof(struct btrfs_dev_extent, chunk_tree_uuid);
1717         return (u8 *)((unsigned long)dev + ptr);
1718 }
1719
1720
1721 /* struct btrfs_extent_item */
1722 BTRFS_SETGET_FUNCS(extent_refs, struct btrfs_extent_item, refs, 64);
1723 BTRFS_SETGET_STACK_FUNCS(stack_extent_refs, struct btrfs_extent_item, refs, 64);
1724 BTRFS_SETGET_FUNCS(extent_generation, struct btrfs_extent_item,
1725                    generation, 64);
1726 BTRFS_SETGET_FUNCS(extent_flags, struct btrfs_extent_item, flags, 64);
1727 BTRFS_SETGET_STACK_FUNCS(stack_extent_flags, struct btrfs_extent_item, flags, 64);
1728
1729 BTRFS_SETGET_FUNCS(extent_refs_v0, struct btrfs_extent_item_v0, refs, 32);
1730
1731 BTRFS_SETGET_FUNCS(tree_block_level, struct btrfs_tree_block_info, level, 8);
1732
1733 static inline void btrfs_tree_block_key(struct extent_buffer *eb,
1734                                         struct btrfs_tree_block_info *item,
1735                                         struct btrfs_disk_key *key)
1736 {
1737         read_eb_member(eb, item, struct btrfs_tree_block_info, key, key);
1738 }
1739
1740 static inline void btrfs_set_tree_block_key(struct extent_buffer *eb,
1741                                             struct btrfs_tree_block_info *item,
1742                                             struct btrfs_disk_key *key)
1743 {
1744         write_eb_member(eb, item, struct btrfs_tree_block_info, key, key);
1745 }
1746
1747 BTRFS_SETGET_FUNCS(extent_data_ref_root, struct btrfs_extent_data_ref,
1748                    root, 64);
1749 BTRFS_SETGET_FUNCS(extent_data_ref_objectid, struct btrfs_extent_data_ref,
1750                    objectid, 64);
1751 BTRFS_SETGET_FUNCS(extent_data_ref_offset, struct btrfs_extent_data_ref,
1752                    offset, 64);
1753 BTRFS_SETGET_FUNCS(extent_data_ref_count, struct btrfs_extent_data_ref,
1754                    count, 32);
1755
1756 BTRFS_SETGET_FUNCS(shared_data_ref_count, struct btrfs_shared_data_ref,
1757                    count, 32);
1758
1759 BTRFS_SETGET_FUNCS(extent_inline_ref_type, struct btrfs_extent_inline_ref,
1760                    type, 8);
1761 BTRFS_SETGET_FUNCS(extent_inline_ref_offset, struct btrfs_extent_inline_ref,
1762                    offset, 64);
1763 BTRFS_SETGET_STACK_FUNCS(stack_extent_inline_ref_type,
1764                          struct btrfs_extent_inline_ref, type, 8);
1765 BTRFS_SETGET_STACK_FUNCS(stack_extent_inline_ref_offset,
1766                          struct btrfs_extent_inline_ref, offset, 64);
1767
1768 static inline u32 btrfs_extent_inline_ref_size(int type)
1769 {
1770         if (type == BTRFS_TREE_BLOCK_REF_KEY ||
1771             type == BTRFS_SHARED_BLOCK_REF_KEY)
1772                 return sizeof(struct btrfs_extent_inline_ref);
1773         if (type == BTRFS_SHARED_DATA_REF_KEY)
1774                 return sizeof(struct btrfs_shared_data_ref) +
1775                        sizeof(struct btrfs_extent_inline_ref);
1776         if (type == BTRFS_EXTENT_DATA_REF_KEY)
1777                 return sizeof(struct btrfs_extent_data_ref) +
1778                        offsetof(struct btrfs_extent_inline_ref, offset);
1779         BUG();
1780         return 0;
1781 }
1782
1783 BTRFS_SETGET_FUNCS(ref_root_v0, struct btrfs_extent_ref_v0, root, 64);
1784 BTRFS_SETGET_FUNCS(ref_generation_v0, struct btrfs_extent_ref_v0,
1785                    generation, 64);
1786 BTRFS_SETGET_FUNCS(ref_objectid_v0, struct btrfs_extent_ref_v0, objectid, 64);
1787 BTRFS_SETGET_FUNCS(ref_count_v0, struct btrfs_extent_ref_v0, count, 32);
1788
1789 /* struct btrfs_node */
1790 BTRFS_SETGET_FUNCS(key_blockptr, struct btrfs_key_ptr, blockptr, 64);
1791 BTRFS_SETGET_FUNCS(key_generation, struct btrfs_key_ptr, generation, 64);
1792
1793 static inline u64 btrfs_node_blockptr(struct extent_buffer *eb, int nr)
1794 {
1795         unsigned long ptr;
1796         ptr = offsetof(struct btrfs_node, ptrs) +
1797                 sizeof(struct btrfs_key_ptr) * nr;
1798         return btrfs_key_blockptr(eb, (struct btrfs_key_ptr *)ptr);
1799 }
1800
1801 static inline void btrfs_set_node_blockptr(struct extent_buffer *eb,
1802                                            int nr, u64 val)
1803 {
1804         unsigned long ptr;
1805         ptr = offsetof(struct btrfs_node, ptrs) +
1806                 sizeof(struct btrfs_key_ptr) * nr;
1807         btrfs_set_key_blockptr(eb, (struct btrfs_key_ptr *)ptr, val);
1808 }
1809
1810 static inline u64 btrfs_node_ptr_generation(struct extent_buffer *eb, int nr)
1811 {
1812         unsigned long ptr;
1813         ptr = offsetof(struct btrfs_node, ptrs) +
1814                 sizeof(struct btrfs_key_ptr) * nr;
1815         return btrfs_key_generation(eb, (struct btrfs_key_ptr *)ptr);
1816 }
1817
1818 static inline void btrfs_set_node_ptr_generation(struct extent_buffer *eb,
1819                                                  int nr, u64 val)
1820 {
1821         unsigned long ptr;
1822         ptr = offsetof(struct btrfs_node, ptrs) +
1823                 sizeof(struct btrfs_key_ptr) * nr;
1824         btrfs_set_key_generation(eb, (struct btrfs_key_ptr *)ptr, val);
1825 }
1826
1827 static inline unsigned long btrfs_node_key_ptr_offset(int nr)
1828 {
1829         return offsetof(struct btrfs_node, ptrs) +
1830                 sizeof(struct btrfs_key_ptr) * nr;
1831 }
1832
1833 static inline void btrfs_node_key(struct extent_buffer *eb,
1834                                   struct btrfs_disk_key *disk_key, int nr)
1835 {
1836         unsigned long ptr;
1837         ptr = btrfs_node_key_ptr_offset(nr);
1838         read_eb_member(eb, (struct btrfs_key_ptr *)ptr,
1839                        struct btrfs_key_ptr, key, disk_key);
1840 }
1841
1842 static inline void btrfs_set_node_key(struct extent_buffer *eb,
1843                                       struct btrfs_disk_key *disk_key, int nr)
1844 {
1845         unsigned long ptr;
1846         ptr = btrfs_node_key_ptr_offset(nr);
1847         write_eb_member(eb, (struct btrfs_key_ptr *)ptr,
1848                        struct btrfs_key_ptr, key, disk_key);
1849 }
1850
1851 /* struct btrfs_item */
1852 BTRFS_SETGET_FUNCS(item_offset, struct btrfs_item, offset, 32);
1853 BTRFS_SETGET_FUNCS(item_size, struct btrfs_item, size, 32);
1854
1855 static inline unsigned long btrfs_item_nr_offset(int nr)
1856 {
1857         return offsetof(struct btrfs_leaf, items) +
1858                 sizeof(struct btrfs_item) * nr;
1859 }
1860
1861 static inline struct btrfs_item *btrfs_item_nr(int nr)
1862 {
1863         return (struct btrfs_item *)btrfs_item_nr_offset(nr);
1864 }
1865
1866 static inline u32 btrfs_item_end(struct extent_buffer *eb,
1867                                  struct btrfs_item *item)
1868 {
1869         return btrfs_item_offset(eb, item) + btrfs_item_size(eb, item);
1870 }
1871
1872 static inline u32 btrfs_item_end_nr(struct extent_buffer *eb, int nr)
1873 {
1874         return btrfs_item_end(eb, btrfs_item_nr(nr));
1875 }
1876
1877 static inline u32 btrfs_item_offset_nr(const struct extent_buffer *eb, int nr)
1878 {
1879         return btrfs_item_offset(eb, btrfs_item_nr(nr));
1880 }
1881
1882 static inline u32 btrfs_item_size_nr(struct extent_buffer *eb, int nr)
1883 {
1884         return btrfs_item_size(eb, btrfs_item_nr(nr));
1885 }
1886
1887 static inline void btrfs_item_key(struct extent_buffer *eb,
1888                            struct btrfs_disk_key *disk_key, int nr)
1889 {
1890         struct btrfs_item *item = btrfs_item_nr(nr);
1891         read_eb_member(eb, item, struct btrfs_item, key, disk_key);
1892 }
1893
1894 static inline void btrfs_set_item_key(struct extent_buffer *eb,
1895                                struct btrfs_disk_key *disk_key, int nr)
1896 {
1897         struct btrfs_item *item = btrfs_item_nr(nr);
1898         write_eb_member(eb, item, struct btrfs_item, key, disk_key);
1899 }
1900
1901 BTRFS_SETGET_FUNCS(dir_log_end, struct btrfs_dir_log_item, end, 64);
1902
1903 /*
1904  * struct btrfs_root_ref
1905  */
1906 BTRFS_SETGET_FUNCS(root_ref_dirid, struct btrfs_root_ref, dirid, 64);
1907 BTRFS_SETGET_FUNCS(root_ref_sequence, struct btrfs_root_ref, sequence, 64);
1908 BTRFS_SETGET_FUNCS(root_ref_name_len, struct btrfs_root_ref, name_len, 16);
1909
1910 BTRFS_SETGET_STACK_FUNCS(stack_root_ref_dirid, struct btrfs_root_ref, dirid, 64);
1911 BTRFS_SETGET_STACK_FUNCS(stack_root_ref_sequence, struct btrfs_root_ref, sequence, 64);
1912 BTRFS_SETGET_STACK_FUNCS(stack_root_ref_name_len, struct btrfs_root_ref, name_len, 16);
1913
1914 /* struct btrfs_dir_item */
1915 BTRFS_SETGET_FUNCS(dir_data_len, struct btrfs_dir_item, data_len, 16);
1916 BTRFS_SETGET_FUNCS(dir_type, struct btrfs_dir_item, type, 8);
1917 BTRFS_SETGET_FUNCS(dir_name_len, struct btrfs_dir_item, name_len, 16);
1918 BTRFS_SETGET_FUNCS(dir_transid, struct btrfs_dir_item, transid, 64);
1919
1920 BTRFS_SETGET_STACK_FUNCS(stack_dir_data_len, struct btrfs_dir_item, data_len, 16);
1921 BTRFS_SETGET_STACK_FUNCS(stack_dir_type, struct btrfs_dir_item, type, 8);
1922 BTRFS_SETGET_STACK_FUNCS(stack_dir_name_len, struct btrfs_dir_item, name_len, 16);
1923 BTRFS_SETGET_STACK_FUNCS(stack_dir_transid, struct btrfs_dir_item, transid, 64);
1924
1925 static inline void btrfs_dir_item_key(struct extent_buffer *eb,
1926                                       struct btrfs_dir_item *item,
1927                                       struct btrfs_disk_key *key)
1928 {
1929         read_eb_member(eb, item, struct btrfs_dir_item, location, key);
1930 }
1931
1932 static inline void btrfs_set_dir_item_key(struct extent_buffer *eb,
1933                                           struct btrfs_dir_item *item,
1934                                           struct btrfs_disk_key *key)
1935 {
1936         write_eb_member(eb, item, struct btrfs_dir_item, location, key);
1937 }
1938
1939 /* struct btrfs_free_space_header */
1940 BTRFS_SETGET_FUNCS(free_space_entries, struct btrfs_free_space_header,
1941                    num_entries, 64);
1942 BTRFS_SETGET_FUNCS(free_space_bitmaps, struct btrfs_free_space_header,
1943                    num_bitmaps, 64);
1944 BTRFS_SETGET_FUNCS(free_space_generation, struct btrfs_free_space_header,
1945                    generation, 64);
1946
1947 static inline void btrfs_free_space_key(struct extent_buffer *eb,
1948                                         struct btrfs_free_space_header *h,
1949                                         struct btrfs_disk_key *key)
1950 {
1951         read_eb_member(eb, h, struct btrfs_free_space_header, location, key);
1952 }
1953
1954 static inline void btrfs_set_free_space_key(struct extent_buffer *eb,
1955                                             struct btrfs_free_space_header *h,
1956                                             struct btrfs_disk_key *key)
1957 {
1958         write_eb_member(eb, h, struct btrfs_free_space_header, location, key);
1959 }
1960
1961 /* struct btrfs_disk_key */
1962 BTRFS_SETGET_STACK_FUNCS(disk_key_objectid, struct btrfs_disk_key,
1963                          objectid, 64);
1964 BTRFS_SETGET_STACK_FUNCS(disk_key_offset, struct btrfs_disk_key, offset, 64);
1965 BTRFS_SETGET_STACK_FUNCS(disk_key_type, struct btrfs_disk_key, type, 8);
1966
1967 static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu,
1968                                          struct btrfs_disk_key *disk)
1969 {
1970         cpu->offset = le64_to_cpu(disk->offset);
1971         cpu->type = disk->type;
1972         cpu->objectid = le64_to_cpu(disk->objectid);
1973 }
1974
1975 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk,
1976                                          struct btrfs_key *cpu)
1977 {
1978         disk->offset = cpu_to_le64(cpu->offset);
1979         disk->type = cpu->type;
1980         disk->objectid = cpu_to_le64(cpu->objectid);
1981 }
1982
1983 static inline void btrfs_node_key_to_cpu(struct extent_buffer *eb,
1984                                   struct btrfs_key *key, int nr)
1985 {
1986         struct btrfs_disk_key disk_key;
1987         btrfs_node_key(eb, &disk_key, nr);
1988         btrfs_disk_key_to_cpu(key, &disk_key);
1989 }
1990
1991 static inline void btrfs_item_key_to_cpu(struct extent_buffer *eb,
1992                                   struct btrfs_key *key, int nr)
1993 {
1994         struct btrfs_disk_key disk_key;
1995         btrfs_item_key(eb, &disk_key, nr);
1996         btrfs_disk_key_to_cpu(key, &disk_key);
1997 }
1998
1999 static inline void btrfs_dir_item_key_to_cpu(struct extent_buffer *eb,
2000                                       struct btrfs_dir_item *item,
2001                                       struct btrfs_key *key)
2002 {
2003         struct btrfs_disk_key disk_key;
2004         btrfs_dir_item_key(eb, item, &disk_key);
2005         btrfs_disk_key_to_cpu(key, &disk_key);
2006 }
2007
2008 /* struct btrfs_header */
2009 BTRFS_SETGET_HEADER_FUNCS(header_bytenr, struct btrfs_header, bytenr, 64);
2010 BTRFS_SETGET_HEADER_FUNCS(header_generation, struct btrfs_header,
2011                           generation, 64);
2012 BTRFS_SETGET_HEADER_FUNCS(header_owner, struct btrfs_header, owner, 64);
2013 BTRFS_SETGET_HEADER_FUNCS(header_nritems, struct btrfs_header, nritems, 32);
2014 BTRFS_SETGET_HEADER_FUNCS(header_flags, struct btrfs_header, flags, 64);
2015 BTRFS_SETGET_HEADER_FUNCS(header_level, struct btrfs_header, level, 8);
2016 BTRFS_SETGET_STACK_FUNCS(stack_header_bytenr, struct btrfs_header, bytenr, 64);
2017 BTRFS_SETGET_STACK_FUNCS(stack_header_nritems, struct btrfs_header, nritems,
2018                          32);
2019 BTRFS_SETGET_STACK_FUNCS(stack_header_owner, struct btrfs_header, owner, 64);
2020 BTRFS_SETGET_STACK_FUNCS(stack_header_generation, struct btrfs_header,
2021                          generation, 64);
2022
2023 static inline int btrfs_header_flag(struct extent_buffer *eb, u64 flag)
2024 {
2025         return (btrfs_header_flags(eb) & flag) == flag;
2026 }
2027
2028 static inline int btrfs_set_header_flag(struct extent_buffer *eb, u64 flag)
2029 {
2030         u64 flags = btrfs_header_flags(eb);
2031         btrfs_set_header_flags(eb, flags | flag);
2032         return (flags & flag) == flag;
2033 }
2034
2035 static inline int btrfs_clear_header_flag(struct extent_buffer *eb, u64 flag)
2036 {
2037         u64 flags = btrfs_header_flags(eb);
2038         btrfs_set_header_flags(eb, flags & ~flag);
2039         return (flags & flag) == flag;
2040 }
2041
2042 static inline int btrfs_header_backref_rev(struct extent_buffer *eb)
2043 {
2044         u64 flags = btrfs_header_flags(eb);
2045         return flags >> BTRFS_BACKREF_REV_SHIFT;
2046 }
2047
2048 static inline void btrfs_set_header_backref_rev(struct extent_buffer *eb,
2049                                                 int rev)
2050 {
2051         u64 flags = btrfs_header_flags(eb);
2052         flags &= ~BTRFS_BACKREF_REV_MASK;
2053         flags |= (u64)rev << BTRFS_BACKREF_REV_SHIFT;
2054         btrfs_set_header_flags(eb, flags);
2055 }
2056
2057 static inline unsigned long btrfs_header_fsid(void)
2058 {
2059         return offsetof(struct btrfs_header, fsid);
2060 }
2061
2062 static inline unsigned long btrfs_header_chunk_tree_uuid(struct extent_buffer *eb)
2063 {
2064         return offsetof(struct btrfs_header, chunk_tree_uuid);
2065 }
2066
2067 static inline u8 *btrfs_header_csum(struct extent_buffer *eb)
2068 {
2069         unsigned long ptr = offsetof(struct btrfs_header, csum);
2070         return (u8 *)ptr;
2071 }
2072
2073 static inline int btrfs_is_leaf(struct extent_buffer *eb)
2074 {
2075         return (btrfs_header_level(eb) == 0);
2076 }
2077
2078 /* struct btrfs_root_item */
2079 BTRFS_SETGET_FUNCS(disk_root_generation, struct btrfs_root_item,
2080                    generation, 64);
2081 BTRFS_SETGET_FUNCS(disk_root_refs, struct btrfs_root_item, refs, 32);
2082 BTRFS_SETGET_FUNCS(disk_root_bytenr, struct btrfs_root_item, bytenr, 64);
2083 BTRFS_SETGET_FUNCS(disk_root_level, struct btrfs_root_item, level, 8);
2084
2085 BTRFS_SETGET_STACK_FUNCS(root_generation, struct btrfs_root_item,
2086                          generation, 64);
2087 BTRFS_SETGET_STACK_FUNCS(root_bytenr, struct btrfs_root_item, bytenr, 64);
2088 BTRFS_SETGET_STACK_FUNCS(root_level, struct btrfs_root_item, level, 8);
2089 BTRFS_SETGET_STACK_FUNCS(root_dirid, struct btrfs_root_item, root_dirid, 64);
2090 BTRFS_SETGET_STACK_FUNCS(root_refs, struct btrfs_root_item, refs, 32);
2091 BTRFS_SETGET_STACK_FUNCS(root_flags, struct btrfs_root_item, flags, 64);
2092 BTRFS_SETGET_STACK_FUNCS(root_used, struct btrfs_root_item, bytes_used, 64);
2093 BTRFS_SETGET_STACK_FUNCS(root_limit, struct btrfs_root_item, byte_limit, 64);
2094 BTRFS_SETGET_STACK_FUNCS(root_last_snapshot, struct btrfs_root_item,
2095                          last_snapshot, 64);
2096 BTRFS_SETGET_STACK_FUNCS(root_generation_v2, struct btrfs_root_item,
2097                          generation_v2, 64);
2098 BTRFS_SETGET_STACK_FUNCS(root_ctransid, struct btrfs_root_item,
2099                          ctransid, 64);
2100 BTRFS_SETGET_STACK_FUNCS(root_otransid, struct btrfs_root_item,
2101                          otransid, 64);
2102 BTRFS_SETGET_STACK_FUNCS(root_stransid, struct btrfs_root_item,
2103                          stransid, 64);
2104 BTRFS_SETGET_STACK_FUNCS(root_rtransid, struct btrfs_root_item,
2105                          rtransid, 64);
2106
2107 static inline struct btrfs_timespec* btrfs_root_ctime(
2108                 struct btrfs_root_item *root_item)
2109 {
2110         unsigned long ptr = (unsigned long)root_item;
2111         ptr += offsetof(struct btrfs_root_item, ctime);
2112         return (struct btrfs_timespec *)ptr;
2113 }
2114
2115 static inline struct btrfs_timespec* btrfs_root_otime(
2116                 struct btrfs_root_item *root_item)
2117 {
2118         unsigned long ptr = (unsigned long)root_item;
2119         ptr += offsetof(struct btrfs_root_item, otime);
2120         return (struct btrfs_timespec *)ptr;
2121 }
2122
2123 static inline struct btrfs_timespec* btrfs_root_stime(
2124                 struct btrfs_root_item *root_item)
2125 {
2126         unsigned long ptr = (unsigned long)root_item;
2127         ptr += offsetof(struct btrfs_root_item, stime);
2128         return (struct btrfs_timespec *)ptr;
2129 }
2130
2131 static inline struct btrfs_timespec* btrfs_root_rtime(
2132                 struct btrfs_root_item *root_item)
2133 {
2134         unsigned long ptr = (unsigned long)root_item;
2135         ptr += offsetof(struct btrfs_root_item, rtime);
2136         return (struct btrfs_timespec *)ptr;
2137 }
2138
2139 /* struct btrfs_root_backup */
2140 BTRFS_SETGET_STACK_FUNCS(backup_tree_root, struct btrfs_root_backup,
2141                    tree_root, 64);
2142 BTRFS_SETGET_STACK_FUNCS(backup_tree_root_gen, struct btrfs_root_backup,
2143                    tree_root_gen, 64);
2144 BTRFS_SETGET_STACK_FUNCS(backup_tree_root_level, struct btrfs_root_backup,
2145                    tree_root_level, 8);
2146
2147 BTRFS_SETGET_STACK_FUNCS(backup_chunk_root, struct btrfs_root_backup,
2148                    chunk_root, 64);
2149 BTRFS_SETGET_STACK_FUNCS(backup_chunk_root_gen, struct btrfs_root_backup,
2150                    chunk_root_gen, 64);
2151 BTRFS_SETGET_STACK_FUNCS(backup_chunk_root_level, struct btrfs_root_backup,
2152                    chunk_root_level, 8);
2153
2154 BTRFS_SETGET_STACK_FUNCS(backup_extent_root, struct btrfs_root_backup,
2155                    extent_root, 64);
2156 BTRFS_SETGET_STACK_FUNCS(backup_extent_root_gen, struct btrfs_root_backup,
2157                    extent_root_gen, 64);
2158 BTRFS_SETGET_STACK_FUNCS(backup_extent_root_level, struct btrfs_root_backup,
2159                    extent_root_level, 8);
2160
2161 BTRFS_SETGET_STACK_FUNCS(backup_fs_root, struct btrfs_root_backup,
2162                    fs_root, 64);
2163 BTRFS_SETGET_STACK_FUNCS(backup_fs_root_gen, struct btrfs_root_backup,
2164                    fs_root_gen, 64);
2165 BTRFS_SETGET_STACK_FUNCS(backup_fs_root_level, struct btrfs_root_backup,
2166                    fs_root_level, 8);
2167
2168 BTRFS_SETGET_STACK_FUNCS(backup_dev_root, struct btrfs_root_backup,
2169                    dev_root, 64);
2170 BTRFS_SETGET_STACK_FUNCS(backup_dev_root_gen, struct btrfs_root_backup,
2171                    dev_root_gen, 64);
2172 BTRFS_SETGET_STACK_FUNCS(backup_dev_root_level, struct btrfs_root_backup,
2173                    dev_root_level, 8);
2174
2175 BTRFS_SETGET_STACK_FUNCS(backup_csum_root, struct btrfs_root_backup,
2176                    csum_root, 64);
2177 BTRFS_SETGET_STACK_FUNCS(backup_csum_root_gen, struct btrfs_root_backup,
2178                    csum_root_gen, 64);
2179 BTRFS_SETGET_STACK_FUNCS(backup_csum_root_level, struct btrfs_root_backup,
2180                    csum_root_level, 8);
2181 BTRFS_SETGET_STACK_FUNCS(backup_total_bytes, struct btrfs_root_backup,
2182                    total_bytes, 64);
2183 BTRFS_SETGET_STACK_FUNCS(backup_bytes_used, struct btrfs_root_backup,
2184                    bytes_used, 64);
2185 BTRFS_SETGET_STACK_FUNCS(backup_num_devices, struct btrfs_root_backup,
2186                    num_devices, 64);
2187
2188 /* struct btrfs_super_block */
2189
2190 BTRFS_SETGET_STACK_FUNCS(super_bytenr, struct btrfs_super_block, bytenr, 64);
2191 BTRFS_SETGET_STACK_FUNCS(super_flags, struct btrfs_super_block, flags, 64);
2192 BTRFS_SETGET_STACK_FUNCS(super_generation, struct btrfs_super_block,
2193                          generation, 64);
2194 BTRFS_SETGET_STACK_FUNCS(super_root, struct btrfs_super_block, root, 64);
2195 BTRFS_SETGET_STACK_FUNCS(super_sys_array_size,
2196                          struct btrfs_super_block, sys_chunk_array_size, 32);
2197 BTRFS_SETGET_STACK_FUNCS(super_chunk_root_generation,
2198                          struct btrfs_super_block, chunk_root_generation, 64);
2199 BTRFS_SETGET_STACK_FUNCS(super_root_level, struct btrfs_super_block,
2200                          root_level, 8);
2201 BTRFS_SETGET_STACK_FUNCS(super_chunk_root, struct btrfs_super_block,
2202                          chunk_root, 64);
2203 BTRFS_SETGET_STACK_FUNCS(super_chunk_root_level, struct btrfs_super_block,
2204                          chunk_root_level, 8);
2205 BTRFS_SETGET_STACK_FUNCS(super_log_root, struct btrfs_super_block,
2206                          log_root, 64);
2207 BTRFS_SETGET_STACK_FUNCS(super_log_root_transid, struct btrfs_super_block,
2208                          log_root_transid, 64);
2209 BTRFS_SETGET_STACK_FUNCS(super_log_root_level, struct btrfs_super_block,
2210                          log_root_level, 8);
2211 BTRFS_SETGET_STACK_FUNCS(super_total_bytes, struct btrfs_super_block,
2212                          total_bytes, 64);
2213 BTRFS_SETGET_STACK_FUNCS(super_bytes_used, struct btrfs_super_block,
2214                          bytes_used, 64);
2215 BTRFS_SETGET_STACK_FUNCS(super_sectorsize, struct btrfs_super_block,
2216                          sectorsize, 32);
2217 BTRFS_SETGET_STACK_FUNCS(super_nodesize, struct btrfs_super_block,
2218                          nodesize, 32);
2219 BTRFS_SETGET_STACK_FUNCS(super_stripesize, struct btrfs_super_block,
2220                          stripesize, 32);
2221 BTRFS_SETGET_STACK_FUNCS(super_root_dir, struct btrfs_super_block,
2222                          root_dir_objectid, 64);
2223 BTRFS_SETGET_STACK_FUNCS(super_num_devices, struct btrfs_super_block,
2224                          num_devices, 64);
2225 BTRFS_SETGET_STACK_FUNCS(super_compat_flags, struct btrfs_super_block,
2226                          compat_flags, 64);
2227 BTRFS_SETGET_STACK_FUNCS(super_compat_ro_flags, struct btrfs_super_block,
2228                          compat_ro_flags, 64);
2229 BTRFS_SETGET_STACK_FUNCS(super_incompat_flags, struct btrfs_super_block,
2230                          incompat_flags, 64);
2231 BTRFS_SETGET_STACK_FUNCS(super_csum_type, struct btrfs_super_block,
2232                          csum_type, 16);
2233 BTRFS_SETGET_STACK_FUNCS(super_cache_generation, struct btrfs_super_block,
2234                          cache_generation, 64);
2235 BTRFS_SETGET_STACK_FUNCS(super_uuid_tree_generation, struct btrfs_super_block,
2236                          uuid_tree_generation, 64);
2237 BTRFS_SETGET_STACK_FUNCS(super_magic, struct btrfs_super_block, magic, 64);
2238
2239 static inline int btrfs_super_csum_size(struct btrfs_super_block *s)
2240 {
2241         int t = btrfs_super_csum_type(s);
2242         BUG_ON(t >= ARRAY_SIZE(btrfs_csum_sizes));
2243         return btrfs_csum_sizes[t];
2244 }
2245
2246 static inline unsigned long btrfs_leaf_data(struct extent_buffer *l)
2247 {
2248         return offsetof(struct btrfs_leaf, items);
2249 }
2250
2251 /* struct btrfs_file_extent_item */
2252 BTRFS_SETGET_FUNCS(file_extent_type, struct btrfs_file_extent_item, type, 8);
2253 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_type, struct btrfs_file_extent_item, type, 8);
2254
2255 static inline unsigned long btrfs_file_extent_inline_start(struct
2256                                                    btrfs_file_extent_item *e)
2257 {
2258         unsigned long offset = (unsigned long)e;
2259         offset += offsetof(struct btrfs_file_extent_item, disk_bytenr);
2260         return offset;
2261 }
2262
2263 static inline u32 btrfs_file_extent_calc_inline_size(u32 datasize)
2264 {
2265         return offsetof(struct btrfs_file_extent_item, disk_bytenr) + datasize;
2266 }
2267
2268 BTRFS_SETGET_FUNCS(file_extent_disk_bytenr, struct btrfs_file_extent_item,
2269                    disk_bytenr, 64);
2270 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_disk_bytenr, struct btrfs_file_extent_item,
2271                    disk_bytenr, 64);
2272 BTRFS_SETGET_FUNCS(file_extent_generation, struct btrfs_file_extent_item,
2273                    generation, 64);
2274 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_generation, struct btrfs_file_extent_item,
2275                    generation, 64);
2276 BTRFS_SETGET_FUNCS(file_extent_disk_num_bytes, struct btrfs_file_extent_item,
2277                    disk_num_bytes, 64);
2278 BTRFS_SETGET_FUNCS(file_extent_offset, struct btrfs_file_extent_item,
2279                   offset, 64);
2280 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_offset, struct btrfs_file_extent_item,
2281                   offset, 64);
2282 BTRFS_SETGET_FUNCS(file_extent_num_bytes, struct btrfs_file_extent_item,
2283                    num_bytes, 64);
2284 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_num_bytes, struct btrfs_file_extent_item,
2285                    num_bytes, 64);
2286 BTRFS_SETGET_FUNCS(file_extent_ram_bytes, struct btrfs_file_extent_item,
2287                    ram_bytes, 64);
2288 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_ram_bytes, struct btrfs_file_extent_item,
2289                    ram_bytes, 64);
2290 BTRFS_SETGET_FUNCS(file_extent_compression, struct btrfs_file_extent_item,
2291                    compression, 8);
2292 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_compression, struct btrfs_file_extent_item,
2293                    compression, 8);
2294 BTRFS_SETGET_FUNCS(file_extent_encryption, struct btrfs_file_extent_item,
2295                    encryption, 8);
2296 BTRFS_SETGET_FUNCS(file_extent_other_encoding, struct btrfs_file_extent_item,
2297                    other_encoding, 16);
2298
2299 /* btrfs_qgroup_status_item */
2300 BTRFS_SETGET_FUNCS(qgroup_status_version, struct btrfs_qgroup_status_item,
2301                    version, 64);
2302 BTRFS_SETGET_FUNCS(qgroup_status_generation, struct btrfs_qgroup_status_item,
2303                    generation, 64);
2304 BTRFS_SETGET_FUNCS(qgroup_status_flags, struct btrfs_qgroup_status_item,
2305                    flags, 64);
2306 BTRFS_SETGET_FUNCS(qgroup_status_rescan, struct btrfs_qgroup_status_item,
2307                    rescan, 64);
2308
2309 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_status_version,
2310                          struct btrfs_qgroup_status_item, version, 64);
2311 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_status_generation,
2312                          struct btrfs_qgroup_status_item, generation, 64);
2313 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_status_flags,
2314                          struct btrfs_qgroup_status_item, flags, 64);
2315 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_status_rescan,
2316                          struct btrfs_qgroup_status_item, rescan, 64);
2317
2318 /* btrfs_qgroup_info_item */
2319 BTRFS_SETGET_FUNCS(qgroup_info_generation, struct btrfs_qgroup_info_item,
2320                    generation, 64);
2321 BTRFS_SETGET_FUNCS(qgroup_info_referenced, struct btrfs_qgroup_info_item,
2322                    referenced, 64);
2323 BTRFS_SETGET_FUNCS(qgroup_info_referenced_compressed,
2324                    struct btrfs_qgroup_info_item, referenced_compressed, 64);
2325 BTRFS_SETGET_FUNCS(qgroup_info_exclusive, struct btrfs_qgroup_info_item,
2326                    exclusive, 64);
2327 BTRFS_SETGET_FUNCS(qgroup_info_exclusive_compressed,
2328                    struct btrfs_qgroup_info_item, exclusive_compressed, 64);
2329
2330 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_generation,
2331                          struct btrfs_qgroup_info_item, generation, 64);
2332 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_referenced,
2333                          struct btrfs_qgroup_info_item, referenced, 64);
2334 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_referenced_compressed,
2335                    struct btrfs_qgroup_info_item, referenced_compressed, 64);
2336 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_exclusive,
2337                          struct btrfs_qgroup_info_item, exclusive, 64);
2338 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_exclusive_compressed,
2339                    struct btrfs_qgroup_info_item, exclusive_compressed, 64);
2340
2341 /* btrfs_qgroup_limit_item */
2342 BTRFS_SETGET_FUNCS(qgroup_limit_flags, struct btrfs_qgroup_limit_item,
2343                    flags, 64);
2344 BTRFS_SETGET_FUNCS(qgroup_limit_max_referenced, struct btrfs_qgroup_limit_item,
2345                    max_referenced, 64);
2346 BTRFS_SETGET_FUNCS(qgroup_limit_max_exclusive, struct btrfs_qgroup_limit_item,
2347                    max_exclusive, 64);
2348 BTRFS_SETGET_FUNCS(qgroup_limit_rsv_referenced, struct btrfs_qgroup_limit_item,
2349                    rsv_referenced, 64);
2350 BTRFS_SETGET_FUNCS(qgroup_limit_rsv_exclusive, struct btrfs_qgroup_limit_item,
2351                    rsv_exclusive, 64);
2352
2353 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_limit_flags,
2354                          struct btrfs_qgroup_limit_item, flags, 64);
2355 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_limit_max_referenced,
2356                          struct btrfs_qgroup_limit_item, max_referenced, 64);
2357 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_limit_max_exclusive,
2358                          struct btrfs_qgroup_limit_item, max_exclusive, 64);
2359 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_limit_rsv_referenced,
2360                          struct btrfs_qgroup_limit_item, rsv_referenced, 64);
2361 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_limit_rsv_exclusive,
2362                          struct btrfs_qgroup_limit_item, rsv_exclusive, 64);
2363
2364 /* btrfs_balance_item */
2365 BTRFS_SETGET_FUNCS(balance_item_flags, struct btrfs_balance_item, flags, 64);
2366
2367 static inline struct btrfs_disk_balance_args* btrfs_balance_item_data(
2368                 struct extent_buffer *eb, struct btrfs_balance_item *bi)
2369 {
2370         unsigned long offset = (unsigned long)bi;
2371         struct btrfs_balance_item *p;
2372         p = (struct btrfs_balance_item *)(eb->data + offset);
2373         return &p->data;
2374 }
2375
2376 static inline struct btrfs_disk_balance_args* btrfs_balance_item_meta(
2377                 struct extent_buffer *eb, struct btrfs_balance_item *bi)
2378 {
2379         unsigned long offset = (unsigned long)bi;
2380         struct btrfs_balance_item *p;
2381         p = (struct btrfs_balance_item *)(eb->data + offset);
2382         return &p->meta;
2383 }
2384
2385 static inline struct btrfs_disk_balance_args* btrfs_balance_item_sys(
2386                 struct extent_buffer *eb, struct btrfs_balance_item *bi)
2387 {
2388         unsigned long offset = (unsigned long)bi;
2389         struct btrfs_balance_item *p;
2390         p = (struct btrfs_balance_item *)(eb->data + offset);
2391         return &p->sys;
2392 }
2393
2394 /*
2395  * btrfs_dev_stats_item helper, returns pointer to the raw array, do the
2396  * endiannes conversion, @dsi is offset to eb data
2397  */
2398 static inline __le64* btrfs_dev_stats_values(struct extent_buffer *eb,
2399                 struct btrfs_dev_stats_item *dsi)
2400 {
2401         unsigned long offset = (unsigned long)dsi;
2402         struct btrfs_dev_stats_item *p;
2403         p = (struct btrfs_dev_stats_item *)(eb->data + offset);
2404         return p->values;
2405 }
2406
2407 /*
2408  * this returns the number of bytes used by the item on disk, minus the
2409  * size of any extent headers.  If a file is compressed on disk, this is
2410  * the compressed size
2411  */
2412 static inline u32 btrfs_file_extent_inline_item_len(struct extent_buffer *eb,
2413                                                     struct btrfs_item *e)
2414 {
2415        unsigned long offset;
2416        offset = offsetof(struct btrfs_file_extent_item, disk_bytenr);
2417        return btrfs_item_size(eb, e) - offset;
2418 }
2419
2420 /* struct btrfs_ioctl_search_header */
2421 static inline u64 btrfs_search_header_transid(struct btrfs_ioctl_search_header *sh)
2422 {
2423         return get_unaligned_64(&sh->transid);
2424 }
2425
2426 static inline u64 btrfs_search_header_objectid(struct btrfs_ioctl_search_header *sh)
2427 {
2428         return get_unaligned_64(&sh->objectid);
2429 }
2430
2431 static inline u64 btrfs_search_header_offset(struct btrfs_ioctl_search_header *sh)
2432 {
2433         return get_unaligned_64(&sh->offset);
2434 }
2435
2436 static inline u32 btrfs_search_header_type(struct btrfs_ioctl_search_header *sh)
2437 {
2438         return get_unaligned_32(&sh->type);
2439 }
2440
2441 static inline u32 btrfs_search_header_len(struct btrfs_ioctl_search_header *sh)
2442 {
2443         return get_unaligned_32(&sh->len);
2444 }
2445
2446 #define btrfs_fs_incompat(fs_info, opt) \
2447         __btrfs_fs_incompat((fs_info), BTRFS_FEATURE_INCOMPAT_##opt)
2448
2449 static inline bool __btrfs_fs_incompat(struct btrfs_fs_info *fs_info, u64 flag)
2450 {
2451         struct btrfs_super_block *disk_super;
2452         disk_super = fs_info->super_copy;
2453         return !!(btrfs_super_incompat_flags(disk_super) & flag);
2454 }
2455
2456 #define btrfs_fs_compat_ro(fs_info, opt) \
2457         __btrfs_fs_compat_ro((fs_info), BTRFS_FEATURE_COMPAT_RO_##opt)
2458
2459 static inline int __btrfs_fs_compat_ro(struct btrfs_fs_info *fs_info, u64 flag)
2460 {
2461         struct btrfs_super_block *disk_super;
2462         disk_super = fs_info->super_copy;
2463         return !!(btrfs_super_compat_ro_flags(disk_super) & flag);
2464 }
2465
2466 /* helper function to cast into the data area of the leaf. */
2467 #define btrfs_item_ptr(leaf, slot, type) \
2468         ((type *)(btrfs_leaf_data(leaf) + \
2469         btrfs_item_offset_nr(leaf, slot)))
2470
2471 #define btrfs_item_ptr_offset(leaf, slot) \
2472         ((unsigned long)(btrfs_leaf_data(leaf) + \
2473         btrfs_item_offset_nr(leaf, slot)))
2474
2475 /* extent-tree.c */
2476 int btrfs_reserve_extent(struct btrfs_trans_handle *trans,
2477                          struct btrfs_root *root,
2478                          u64 num_bytes, u64 empty_size,
2479                          u64 hint_byte, u64 search_end,
2480                          struct btrfs_key *ins, bool is_data);
2481 int btrfs_fix_block_accounting(struct btrfs_trans_handle *trans);
2482 void btrfs_pin_extent(struct btrfs_fs_info *fs_info, u64 bytenr, u64 num_bytes);
2483 void btrfs_unpin_extent(struct btrfs_fs_info *fs_info,
2484                         u64 bytenr, u64 num_bytes);
2485 int btrfs_extent_post_op(struct btrfs_trans_handle *trans);
2486 struct btrfs_block_group_cache *btrfs_lookup_block_group(struct
2487                                                          btrfs_fs_info *info,
2488                                                          u64 bytenr);
2489 struct btrfs_block_group_cache *btrfs_lookup_first_block_group(struct
2490                                                        btrfs_fs_info *info,
2491                                                        u64 bytenr);
2492 struct extent_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
2493                                         struct btrfs_root *root,
2494                                         u32 blocksize, u64 root_objectid,
2495                                         struct btrfs_disk_key *key, int level,
2496                                         u64 hint, u64 empty_size);
2497 int btrfs_lookup_extent_info(struct btrfs_trans_handle *trans,
2498                              struct btrfs_fs_info *fs_info, u64 bytenr,
2499                              u64 offset, int metadata, u64 *refs, u64 *flags);
2500 int btrfs_set_block_flags(struct btrfs_trans_handle *trans, u64 bytenr,
2501                           int level, u64 flags);
2502 int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2503                   struct extent_buffer *buf, int record_parent);
2504 int btrfs_dec_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2505                   struct extent_buffer *buf, int record_parent);
2506 int btrfs_free_tree_block(struct btrfs_trans_handle *trans,
2507                           struct btrfs_root *root,
2508                           struct extent_buffer *buf,
2509                           u64 parent, int last_ref);
2510 int btrfs_free_extent(struct btrfs_trans_handle *trans,
2511                       struct btrfs_root *root,
2512                       u64 bytenr, u64 num_bytes, u64 parent,
2513                       u64 root_objectid, u64 owner, u64 offset);
2514 int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans,
2515                                struct btrfs_root *root,
2516                                struct extent_io_tree *unpin);
2517 int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
2518                                 struct btrfs_root *root,
2519                                 u64 bytenr, u64 num_bytes, u64 parent,
2520                                 u64 root_objectid, u64 ref_generation,
2521                                 u64 owner_objectid);
2522 int btrfs_update_extent_ref(struct btrfs_trans_handle *trans,
2523                             struct btrfs_root *root, u64 bytenr,
2524                             u64 orig_parent, u64 parent,
2525                             u64 root_objectid, u64 ref_generation,
2526                             u64 owner_objectid);
2527 int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans,
2528                                     struct btrfs_root *root);
2529 int btrfs_free_block_groups(struct btrfs_fs_info *info);
2530 int btrfs_read_block_groups(struct btrfs_root *root);
2531 struct btrfs_block_group_cache *
2532 btrfs_add_block_group(struct btrfs_fs_info *fs_info, u64 bytes_used, u64 type,
2533                       u64 chunk_offset, u64 size);
2534 int btrfs_make_block_group(struct btrfs_trans_handle *trans,
2535                            struct btrfs_fs_info *fs_info, u64 bytes_used,
2536                            u64 type, u64 chunk_offset, u64 size);
2537 int btrfs_make_block_groups(struct btrfs_trans_handle *trans,
2538                             struct btrfs_fs_info *fs_info);
2539 int btrfs_update_block_group(struct btrfs_root *root, u64 bytenr, u64 num,
2540                              int alloc, int mark_free);
2541 int btrfs_record_file_extent(struct btrfs_trans_handle *trans,
2542                               struct btrfs_root *root, u64 objectid,
2543                               struct btrfs_inode_item *inode,
2544                               u64 file_pos, u64 disk_bytenr,
2545                               u64 num_bytes);
2546 int btrfs_free_block_group(struct btrfs_trans_handle *trans,
2547                            struct btrfs_fs_info *fs_info, u64 bytenr, u64 len);
2548 void free_excluded_extents(struct btrfs_root *root,
2549                            struct btrfs_block_group_cache *cache);
2550 int exclude_super_stripes(struct btrfs_root *root,
2551                           struct btrfs_block_group_cache *cache);
2552 u64 add_new_free_space(struct btrfs_block_group_cache *block_group,
2553                        struct btrfs_fs_info *info, u64 start, u64 end);
2554 u64 hash_extent_data_ref(u64 root_objectid, u64 owner, u64 offset);
2555
2556 /* ctree.c */
2557 int btrfs_comp_cpu_keys(struct btrfs_key *k1, struct btrfs_key *k2);
2558 int btrfs_del_ptr(struct btrfs_root *root, struct btrfs_path *path,
2559                 int level, int slot);
2560 enum btrfs_tree_block_status
2561 btrfs_check_node(struct btrfs_root *root, struct btrfs_disk_key *parent_key,
2562                  struct extent_buffer *buf);
2563 enum btrfs_tree_block_status
2564 btrfs_check_leaf(struct btrfs_root *root, struct btrfs_disk_key *parent_key,
2565                  struct extent_buffer *buf);
2566 void reada_for_search(struct btrfs_root *root, struct btrfs_path *path,
2567                              int level, int slot, u64 objectid);
2568 struct extent_buffer *read_node_slot(struct btrfs_fs_info *fs_info,
2569                                    struct extent_buffer *parent, int slot);
2570 int btrfs_previous_item(struct btrfs_root *root,
2571                         struct btrfs_path *path, u64 min_objectid,
2572                         int type);
2573 int btrfs_previous_extent_item(struct btrfs_root *root,
2574                         struct btrfs_path *path, u64 min_objectid);
2575 int btrfs_next_extent_item(struct btrfs_root *root,
2576                         struct btrfs_path *path, u64 max_objectid);
2577 int btrfs_cow_block(struct btrfs_trans_handle *trans,
2578                     struct btrfs_root *root, struct extent_buffer *buf,
2579                     struct extent_buffer *parent, int parent_slot,
2580                     struct extent_buffer **cow_ret);
2581 int __btrfs_cow_block(struct btrfs_trans_handle *trans,
2582                              struct btrfs_root *root,
2583                              struct extent_buffer *buf,
2584                              struct extent_buffer *parent, int parent_slot,
2585                              struct extent_buffer **cow_ret,
2586                              u64 search_start, u64 empty_size);
2587 int btrfs_copy_root(struct btrfs_trans_handle *trans,
2588                       struct btrfs_root *root,
2589                       struct extent_buffer *buf,
2590                       struct extent_buffer **cow_ret, u64 new_root_objectid);
2591 int btrfs_extend_item(struct btrfs_root *root, struct btrfs_path *path,
2592                 u32 data_size);
2593 int btrfs_truncate_item(struct btrfs_root *root, struct btrfs_path *path,
2594                         u32 new_size, int from_end);
2595 int btrfs_split_item(struct btrfs_trans_handle *trans,
2596                      struct btrfs_root *root,
2597                      struct btrfs_path *path,
2598                      struct btrfs_key *new_key,
2599                      unsigned long split_offset);
2600 int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root
2601                       *root, struct btrfs_key *key, struct btrfs_path *p, int
2602                       ins_len, int cow);
2603 int btrfs_find_item(struct btrfs_root *fs_root, struct btrfs_path *found_path,
2604                 u64 iobjectid, u64 ioff, u8 key_type,
2605                 struct btrfs_key *found_key);
2606 void btrfs_release_path(struct btrfs_path *p);
2607 void add_root_to_dirty_list(struct btrfs_root *root);
2608 struct btrfs_path *btrfs_alloc_path(void);
2609 void btrfs_free_path(struct btrfs_path *p);
2610 void btrfs_init_path(struct btrfs_path *p);
2611 int btrfs_del_items(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2612                    struct btrfs_path *path, int slot, int nr);
2613
2614 static inline int btrfs_del_item(struct btrfs_trans_handle *trans,
2615                                  struct btrfs_root *root,
2616                                  struct btrfs_path *path)
2617 {
2618         return btrfs_del_items(trans, root, path, path->slots[0], 1);
2619 }
2620
2621 int btrfs_insert_item(struct btrfs_trans_handle *trans, struct btrfs_root
2622                       *root, struct btrfs_key *key, void *data, u32 data_size);
2623 int btrfs_insert_empty_items(struct btrfs_trans_handle *trans,
2624                              struct btrfs_root *root,
2625                              struct btrfs_path *path,
2626                              struct btrfs_key *cpu_key, u32 *data_size, int nr);
2627
2628 static inline int btrfs_insert_empty_item(struct btrfs_trans_handle *trans,
2629                                           struct btrfs_root *root,
2630                                           struct btrfs_path *path,
2631                                           struct btrfs_key *key,
2632                                           u32 data_size)
2633 {
2634         return btrfs_insert_empty_items(trans, root, path, key, &data_size, 1);
2635 }
2636
2637 int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path);
2638 static inline int btrfs_next_item(struct btrfs_root *root,
2639                                   struct btrfs_path *p)
2640 {
2641         ++p->slots[0];
2642         if (p->slots[0] >= btrfs_header_nritems(p->nodes[0]))
2643                 return btrfs_next_leaf(root, p);
2644         return 0;
2645 }
2646
2647 int btrfs_prev_leaf(struct btrfs_root *root, struct btrfs_path *path);
2648 int btrfs_leaf_free_space(struct extent_buffer *leaf);
2649 void btrfs_fixup_low_keys(struct btrfs_root *root, struct btrfs_path *path,
2650                           struct btrfs_disk_key *key, int level);
2651 int btrfs_set_item_key_safe(struct btrfs_root *root, struct btrfs_path *path,
2652                             struct btrfs_key *new_key);
2653 void btrfs_set_item_key_unsafe(struct btrfs_root *root,
2654                                struct btrfs_path *path,
2655                                struct btrfs_key *new_key);
2656
2657 /* root-item.c */
2658 int btrfs_add_root_ref(struct btrfs_trans_handle *trans,
2659                        struct btrfs_root *tree_root,
2660                        u64 root_id, u8 type, u64 ref_id,
2661                        u64 dirid, u64 sequence,
2662                        const char *name, int name_len);
2663 int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root
2664                       *root, struct btrfs_key *key, struct btrfs_root_item
2665                       *item);
2666 int btrfs_del_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2667                    struct btrfs_key *key);
2668 int btrfs_update_root(struct btrfs_trans_handle *trans, struct btrfs_root
2669                       *root, struct btrfs_key *key, struct btrfs_root_item
2670                       *item);
2671 int btrfs_find_last_root(struct btrfs_root *root, u64 objectid, struct
2672                          btrfs_root_item *item, struct btrfs_key *key);
2673 /* dir-item.c */
2674 int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
2675                           *root, const char *name, int name_len, u64 dir,
2676                           struct btrfs_key *location, u8 type, u64 index);
2677 struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans,
2678                                              struct btrfs_root *root,
2679                                              struct btrfs_path *path, u64 dir,
2680                                              const char *name, int name_len,
2681                                              int mod);
2682 struct btrfs_dir_item *btrfs_lookup_dir_index(struct btrfs_trans_handle *trans,
2683                                               struct btrfs_root *root,
2684                                               struct btrfs_path *path, u64 dir,
2685                                               const char *name, int name_len,
2686                                               u64 index, int mod);
2687 int btrfs_delete_one_dir_name(struct btrfs_trans_handle *trans,
2688                               struct btrfs_root *root,
2689                               struct btrfs_path *path,
2690                               struct btrfs_dir_item *di);
2691 int btrfs_insert_xattr_item(struct btrfs_trans_handle *trans,
2692                             struct btrfs_root *root, const char *name,
2693                             u16 name_len, const void *data, u16 data_len,
2694                             u64 dir);
2695 /* inode-map.c */
2696 int btrfs_find_free_objectid(struct btrfs_trans_handle *trans,
2697                              struct btrfs_root *fs_root,
2698                              u64 dirid, u64 *objectid);
2699
2700 /* inode-item.c */
2701 int btrfs_insert_inode_ref(struct btrfs_trans_handle *trans,
2702                            struct btrfs_root *root,
2703                            const char *name, int name_len,
2704                            u64 inode_objectid, u64 ref_objectid, u64 index);
2705 int btrfs_insert_inode(struct btrfs_trans_handle *trans, struct btrfs_root
2706                        *root, u64 objectid, struct btrfs_inode_item
2707                        *inode_item);
2708 int btrfs_lookup_inode(struct btrfs_trans_handle *trans, struct btrfs_root
2709                        *root, struct btrfs_path *path,
2710                        struct btrfs_key *location, int mod);
2711 struct btrfs_inode_extref *btrfs_lookup_inode_extref(struct btrfs_trans_handle
2712                 *trans, struct btrfs_path *path, struct btrfs_root *root,
2713                 u64 ino, u64 parent_ino, u64 index, const char *name,
2714                 int namelen, int ins_len);
2715 int btrfs_del_inode_extref(struct btrfs_trans_handle *trans,
2716                            struct btrfs_root *root,
2717                            const char *name, int name_len,
2718                            u64 inode_objectid, u64 ref_objectid,
2719                            u64 *index);
2720 int btrfs_insert_inode_extref(struct btrfs_trans_handle *trans,
2721                               struct btrfs_root *root,
2722                               const char *name, int name_len,
2723                               u64 inode_objectid, u64 ref_objectid, u64 index);
2724 struct btrfs_inode_ref *btrfs_lookup_inode_ref(struct btrfs_trans_handle *trans,
2725                 struct btrfs_root *root, struct btrfs_path *path,
2726                 const char *name, int namelen, u64 ino, u64 parent_ino,
2727                 int ins_len);
2728 int btrfs_del_inode_ref(struct btrfs_trans_handle *trans,
2729                         struct btrfs_root *root, const char *name, int name_len,
2730                         u64 ino, u64 parent_ino, u64 *index);
2731
2732 /* file-item.c */
2733 int btrfs_del_csums(struct btrfs_trans_handle *trans,
2734                     struct btrfs_root *root, u64 bytenr, u64 len);
2735 int btrfs_insert_file_extent(struct btrfs_trans_handle *trans,
2736                              struct btrfs_root *root,
2737                              u64 objectid, u64 pos, u64 offset,
2738                              u64 disk_num_bytes,
2739                              u64 num_bytes);
2740 int btrfs_insert_inline_extent(struct btrfs_trans_handle *trans,
2741                                 struct btrfs_root *root, u64 objectid,
2742                                 u64 offset, const char *buffer, size_t size);
2743 int btrfs_csum_file_block(struct btrfs_trans_handle *trans,
2744                           struct btrfs_root *root, u64 alloc_end,
2745                           u64 bytenr, char *data, size_t len);
2746 int btrfs_csum_truncate(struct btrfs_trans_handle *trans,
2747                         struct btrfs_root *root, struct btrfs_path *path,
2748                         u64 isize);
2749
2750 /* uuid-tree.c */
2751 int btrfs_lookup_uuid_subvol_item(int fd, const u8 *uuid, u64 *subvol_id);
2752 int btrfs_lookup_uuid_received_subvol_item(int fd, const u8 *uuid,
2753                                            u64 *subvol_id);
2754
2755 static inline int is_fstree(u64 rootid)
2756 {
2757         if (rootid == BTRFS_FS_TREE_OBJECTID ||
2758             (signed long long)rootid >= (signed long long)BTRFS_FIRST_FREE_OBJECTID)
2759                 return 1;
2760         return 0;
2761 }
2762
2763 /* inode.c */
2764 int check_dir_conflict(struct btrfs_root *root, char *name, int namelen,
2765                 u64 dir, u64 index);
2766 int btrfs_new_inode(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2767                 u64 ino, u32 mode);
2768 int btrfs_change_inode_flags(struct btrfs_trans_handle *trans,
2769                              struct btrfs_root *root, u64 ino, u64 flags);
2770 int btrfs_add_link(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2771                    u64 ino, u64 parent_ino, char *name, int namelen,
2772                    u8 type, u64 *index, int add_backref, int ignore_existed);
2773 int btrfs_unlink(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2774                  u64 ino, u64 parent_ino, u64 index, const char *name,
2775                  int namelen, int add_orphan);
2776 int btrfs_add_orphan_item(struct btrfs_trans_handle *trans,
2777                           struct btrfs_root *root, struct btrfs_path *path,
2778                           u64 ino);
2779 int btrfs_mkdir(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2780                 char *name, int namelen, u64 parent_ino, u64 *ino, int mode);
2781 struct btrfs_root *btrfs_mksubvol(struct btrfs_root *root, const char *base,
2782                                   u64 root_objectid, bool convert);
2783
2784 /* file.c */
2785 int btrfs_get_extent(struct btrfs_trans_handle *trans,
2786                      struct btrfs_root *root,
2787                      struct btrfs_path *path,
2788                      u64 ino, u64 offset, u64 len, int ins_len);
2789 int btrfs_punch_hole(struct btrfs_trans_handle *trans,
2790                      struct btrfs_root *root,
2791                      u64 ino, u64 offset, u64 len);
2792 int btrfs_read_file(struct btrfs_root *root, u64 ino, u64 start, int len,
2793                     char *dest);
2794
2795 #endif