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, structures might be partially
  49  * created or missing.
  50  */
  51 #define BTRFS_MAGIC_PARTIAL 0x4D5F536652484221ULL /* ascii !BHRfS_M, no null */
  52
  53 #define BTRFS_MAX_MIRRORS 3
  54
  55 #define BTRFS_MAX_LEVEL 8
  56
  57 #define BTRFS_COMPAT_EXTENT_TREE_V0
  58
  59 /* holds pointers to all of the tree roots */
  60 #define BTRFS_ROOT_TREE_OBJECTID 1ULL
  61
  62 /* stores information about which extents are in use, and reference counts */
  63 #define BTRFS_EXTENT_TREE_OBJECTID 2ULL
  64
  65 /*
  66  * chunk tree stores translations from logical -> physical block numbering
  67  * the super block points to the chunk tree
  68  */
  69 #define BTRFS_CHUNK_TREE_OBJECTID 3ULL
  70
  71 /*
  72  * stores information about which areas of a given device are in use.
  73  * one per device.  The tree of tree roots points to the device tree
  74  */
  75 #define BTRFS_DEV_TREE_OBJECTID 4ULL
  76
  77 /* one per subvolume, storing files and directories */
  78 #define BTRFS_FS_TREE_OBJECTID 5ULL
  79
  80 /* directory objectid inside the root tree */
  81 #define BTRFS_ROOT_TREE_DIR_OBJECTID 6ULL
  82 /* holds checksums of all the data extents */
  83 #define BTRFS_CSUM_TREE_OBJECTID 7ULL
  84 #define BTRFS_QUOTA_TREE_OBJECTID 8ULL
  85
  86 /* for storing items that use the BTRFS_UUID_KEY* */
  87 #define BTRFS_UUID_TREE_OBJECTID 9ULL
  88
  89 /* tracks free space in block groups. */
  90 #define BTRFS_FREE_SPACE_TREE_OBJECTID 10ULL
  91
  92 /* device stats in the device tree */
  93 #define BTRFS_DEV_STATS_OBJECTID 0ULL
  94
  95 /* for storing balance parameters in the root tree */
  96 #define BTRFS_BALANCE_OBJECTID -4ULL
  97
  98 /* oprhan objectid for tracking unlinked/truncated files */
  99 #define BTRFS_ORPHAN_OBJECTID -5ULL
 100
 101 /* does write ahead logging to speed up fsyncs */
 102 #define BTRFS_TREE_LOG_OBJECTID -6ULL
 103 #define BTRFS_TREE_LOG_FIXUP_OBJECTID -7ULL
 104
 105 /* space balancing */
 106 #define BTRFS_TREE_RELOC_OBJECTID -8ULL
 107 #define BTRFS_DATA_RELOC_TREE_OBJECTID -9ULL
 108
 109 /*
 110  * extent checksums all have this objectid
 111  * this allows them to share the logging tree
 112  * for fsyncs
 113  */
 114 #define BTRFS_EXTENT_CSUM_OBJECTID -10ULL
 115
 116 /* For storing free space cache */
 117 #define BTRFS_FREE_SPACE_OBJECTID -11ULL
 118
 119 /*
 120  * The inode number assigned to the special inode for sotring
 121  * free ino cache
 122  */
 123 #define BTRFS_FREE_INO_OBJECTID -12ULL
 124
 125 /* dummy objectid represents multiple objectids */
 126 #define BTRFS_MULTIPLE_OBJECTIDS -255ULL
 127
 128 /*
 129  * All files have objectids in this range.
 130  */
 131 #define BTRFS_FIRST_FREE_OBJECTID 256ULL
 132 #define BTRFS_LAST_FREE_OBJECTID -256ULL
 133 #define BTRFS_FIRST_CHUNK_TREE_OBJECTID 256ULL
 134
 135
 136
 137 /*
 138  * the device items go into the chunk tree.  The key is in the form
 139  * [ 1 BTRFS_DEV_ITEM_KEY device_id ]
 140  */
 141 #define BTRFS_DEV_ITEMS_OBJECTID 1ULL
 142
 143 #define BTRFS_EMPTY_SUBVOL_DIR_OBJECTID 2ULL
 144
 145 /*
 146  * the max metadata block size.  This limit is somewhat artificial,
 147  * but the memmove costs go through the roof for larger blocks.
 148  */
 149 #define BTRFS_MAX_METADATA_BLOCKSIZE 65536
 150
 151 /*
 152  * we can actually store much bigger names, but lets not confuse the rest
 153  * of linux
 154  */
 155 #define BTRFS_NAME_LEN 255
 156
 157 /*
 158  * Theoretical limit is larger, but we keep this down to a sane
 159  * value. That should limit greatly the possibility of collisions on
 160  * inode ref items.
 161  */
 162 #define BTRFS_LINK_MAX  65535U
 163
 164 /* 32 bytes in various csum fields */
 165 #define BTRFS_CSUM_SIZE 32
 166
 167 /* csum types */
 168 #define BTRFS_CSUM_TYPE_CRC32   0
 169
 170 static int btrfs_csum_sizes[] = { 4 };
 171
 172 /* four bytes for CRC32 */
 173 #define BTRFS_CRC32_SIZE 4
 174 #define BTRFS_EMPTY_DIR_SIZE 0
 175
 176 #define BTRFS_FT_UNKNOWN        0
 177 #define BTRFS_FT_REG_FILE       1
 178 #define BTRFS_FT_DIR            2
 179 #define BTRFS_FT_CHRDEV         3
 180 #define BTRFS_FT_BLKDEV         4
 181 #define BTRFS_FT_FIFO           5
 182 #define BTRFS_FT_SOCK           6
 183 #define BTRFS_FT_SYMLINK        7
 184 #define BTRFS_FT_XATTR          8
 185 #define BTRFS_FT_MAX            9
 186
 187 #define BTRFS_ROOT_SUBVOL_RDONLY        (1ULL << 0)
 188
 189 /*
 190  * the key defines the order in the tree, and so it also defines (optimal)
 191  * block layout.  objectid corresponds to the inode number.  The flags
 192  * tells us things about the object, and is a kind of stream selector.
 193  * so for a given inode, keys with flags of 1 might refer to the inode
 194  * data, flags of 2 may point to file data in the btree and flags == 3
 195  * may point to extents.
 196  *
 197  * offset is the starting byte offset for this key in the stream.
 198  *
 199  * btrfs_disk_key is in disk byte order.  struct btrfs_key is always
 200  * in cpu native order.  Otherwise they are identical and their sizes
 201  * should be the same (ie both packed)
 202  */
 203 struct btrfs_disk_key {
 204         __le64 objectid;
 205         u8 type;
 206         __le64 offset;
 207 } __attribute__ ((__packed__));
 208
 209 struct btrfs_key {
 210         u64 objectid;
 211         u8 type;
 212         u64 offset;
 213 } __attribute__ ((__packed__));
 214
 215 struct btrfs_mapping_tree {
 216         struct cache_tree cache_tree;
 217 };
 218
 219 #define BTRFS_UUID_SIZE 16
 220 struct btrfs_dev_item {
 221         /* the internal btrfs device id */
 222         __le64 devid;
 223
 224         /* size of the device */
 225         __le64 total_bytes;
 226
 227         /* bytes used */
 228         __le64 bytes_used;
 229
 230         /* optimal io alignment for this device */
 231         __le32 io_align;
 232
 233         /* optimal io width for this device */
 234         __le32 io_width;
 235
 236         /* minimal io size for this device */
 237         __le32 sector_size;
 238
 239         /* type and info about this device */
 240         __le64 type;
 241
 242         /* expected generation for this device */
 243         __le64 generation;
 244
 245         /*
 246          * starting byte of this partition on the device,
 247          * to allow for stripe alignment in the future
 248          */
 249         __le64 start_offset;
 250
 251         /* grouping information for allocation decisions */
 252         __le32 dev_group;
 253
 254         /* seek speed 0-100 where 100 is fastest */
 255         u8 seek_speed;
 256
 257         /* bandwidth 0-100 where 100 is fastest */
 258         u8 bandwidth;
 259
 260         /* btrfs generated uuid for this device */
 261         u8 uuid[BTRFS_UUID_SIZE];
 262
 263         /* uuid of FS who owns this device */
 264         u8 fsid[BTRFS_UUID_SIZE];
 265 } __attribute__ ((__packed__));
 266
 267 struct btrfs_stripe {
 268         __le64 devid;
 269         __le64 offset;
 270         u8 dev_uuid[BTRFS_UUID_SIZE];
 271 } __attribute__ ((__packed__));
 272
 273 struct btrfs_chunk {
 274         /* size of this chunk in bytes */
 275         __le64 length;
 276
 277         /* objectid of the root referencing this chunk */
 278         __le64 owner;
 279
 280         __le64 stripe_len;
 281         __le64 type;
 282
 283         /* optimal io alignment for this chunk */
 284         __le32 io_align;
 285
 286         /* optimal io width for this chunk */
 287         __le32 io_width;
 288
 289         /* minimal io size for this chunk */
 290         __le32 sector_size;
 291
 292         /* 2^16 stripes is quite a lot, a second limit is the size of a single
 293          * item in the btree
 294          */
 295         __le16 num_stripes;
 296
 297         /* sub stripes only matter for raid10 */
 298         __le16 sub_stripes;
 299         struct btrfs_stripe stripe;
 300         /* additional stripes go here */
 301 } __attribute__ ((__packed__));
 302
 303 #define BTRFS_FREE_SPACE_EXTENT 1
 304 #define BTRFS_FREE_SPACE_BITMAP 2
 305
 306 struct btrfs_free_space_entry {
 307         __le64 offset;
 308         __le64 bytes;
 309         u8 type;
 310 } __attribute__ ((__packed__));
 311
 312 struct btrfs_free_space_header {
 313         struct btrfs_disk_key location;
 314         __le64 generation;
 315         __le64 num_entries;
 316         __le64 num_bitmaps;
 317 } __attribute__ ((__packed__));
 318
 319 static inline unsigned long btrfs_chunk_item_size(int num_stripes)
 320 {
 321         BUG_ON(num_stripes == 0);
 322         return sizeof(struct btrfs_chunk) +
 323                 sizeof(struct btrfs_stripe) * (num_stripes - 1);
 324 }
 325
 326 #define BTRFS_HEADER_FLAG_WRITTEN               (1ULL << 0)
 327 #define BTRFS_HEADER_FLAG_RELOC                 (1ULL << 1)
 328 #define BTRFS_SUPER_FLAG_SEEDING                (1ULL << 32)
 329 #define BTRFS_SUPER_FLAG_METADUMP               (1ULL << 33)
 330 #define BTRFS_SUPER_FLAG_METADUMP_V2            (1ULL << 34)
 331 #define BTRFS_SUPER_FLAG_CHANGING_FSID          (1ULL << 35)
 332
 333 #define BTRFS_BACKREF_REV_MAX           256
 334 #define BTRFS_BACKREF_REV_SHIFT         56
 335 #define BTRFS_BACKREF_REV_MASK          (((u64)BTRFS_BACKREF_REV_MAX - 1) << \
 336                                          BTRFS_BACKREF_REV_SHIFT)
 337
 338 #define BTRFS_OLD_BACKREF_REV           0
 339 #define BTRFS_MIXED_BACKREF_REV         1
 340
 341 /*
 342  * every tree block (leaf or node) starts with this header.
 343  */
 344 struct btrfs_header {
 345         /* these first four must match the super block */
 346         u8 csum[BTRFS_CSUM_SIZE];
 347         u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
 348         __le64 bytenr; /* which block this node is supposed to live in */
 349         __le64 flags;
 350
 351         /* allowed to be different from the super from here on down */
 352         u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
 353         __le64 generation;
 354         __le64 owner;
 355         __le32 nritems;
 356         u8 level;
 357 } __attribute__ ((__packed__));
 358
 359 #define BTRFS_NODEPTRS_PER_BLOCK(r) (((r)->fs_info->nodesize - \
 360                                 sizeof(struct btrfs_header)) / \
 361                                 sizeof(struct btrfs_key_ptr))
 362 #define __BTRFS_LEAF_DATA_SIZE(bs) ((bs) - sizeof(struct btrfs_header))
 363 #define BTRFS_LEAF_DATA_SIZE(r) (__BTRFS_LEAF_DATA_SIZE(r->fs_info->nodesize))
 364 #define BTRFS_MAX_INLINE_DATA_SIZE(r) (BTRFS_LEAF_DATA_SIZE(r) - \
 365                                         sizeof(struct btrfs_item) - \
 366                                         sizeof(struct btrfs_file_extent_item))
 367 #define BTRFS_MAX_XATTR_SIZE(r) (BTRFS_LEAF_DATA_SIZE(r) - \
 368                                  sizeof(struct btrfs_item) -\
 369                                  sizeof(struct btrfs_dir_item))
 370
 371
 372 /*
 373  * this is a very generous portion of the super block, giving us
 374  * room to translate 14 chunks with 3 stripes each.
 375  */
 376 #define BTRFS_SYSTEM_CHUNK_ARRAY_SIZE 2048
 377 #define BTRFS_LABEL_SIZE 256
 378
 379 /*
 380  * just in case we somehow lose the roots and are not able to mount,
 381  * we store an array of the roots from previous transactions
 382  * in the super.
 383  */
 384 #define BTRFS_NUM_BACKUP_ROOTS 4
 385 struct btrfs_root_backup {
 386         __le64 tree_root;
 387         __le64 tree_root_gen;
 388
 389         __le64 chunk_root;
 390         __le64 chunk_root_gen;
 391
 392         __le64 extent_root;
 393         __le64 extent_root_gen;
 394
 395         __le64 fs_root;
 396         __le64 fs_root_gen;
 397
 398         __le64 dev_root;
 399         __le64 dev_root_gen;
 400
 401         __le64 csum_root;
 402         __le64 csum_root_gen;
 403
 404         __le64 total_bytes;
 405         __le64 bytes_used;
 406         __le64 num_devices;
 407         /* future */
 408         __le64 unsed_64[4];
 409
 410         u8 tree_root_level;
 411         u8 chunk_root_level;
 412         u8 extent_root_level;
 413         u8 fs_root_level;
 414         u8 dev_root_level;
 415         u8 csum_root_level;
 416         /* future and to align */
 417         u8 unused_8[10];
 418 } __attribute__ ((__packed__));
 419
 420 /*
 421  * the super block basically lists the main trees of the FS
 422  * it currently lacks any block count etc etc
 423  */
 424 struct btrfs_super_block {
 425         u8 csum[BTRFS_CSUM_SIZE];
 426         /* the first 3 fields must match struct btrfs_header */
 427         u8 fsid[BTRFS_FSID_SIZE];    /* FS specific uuid */
 428         __le64 bytenr; /* this block number */
 429         __le64 flags;
 430
 431         /* allowed to be different from the btrfs_header from here own down */
 432         __le64 magic;
 433         __le64 generation;
 434         __le64 root;
 435         __le64 chunk_root;
 436         __le64 log_root;
 437
 438         /* this will help find the new super based on the log root */
 439         __le64 log_root_transid;
 440         __le64 total_bytes;
 441         __le64 bytes_used;
 442         __le64 root_dir_objectid;
 443         __le64 num_devices;
 444         __le32 sectorsize;
 445         __le32 nodesize;
 446         /* Unused and must be equal to nodesize */
 447         __le32 __unused_leafsize;
 448         __le32 stripesize;
 449         __le32 sys_chunk_array_size;
 450         __le64 chunk_root_generation;
 451         __le64 compat_flags;
 452         __le64 compat_ro_flags;
 453         __le64 incompat_flags;
 454         __le16 csum_type;
 455         u8 root_level;
 456         u8 chunk_root_level;
 457         u8 log_root_level;
 458         struct btrfs_dev_item dev_item;
 459
 460         char label[BTRFS_LABEL_SIZE];
 461
 462         __le64 cache_generation;
 463         __le64 uuid_tree_generation;
 464
 465         /* future expansion */
 466         __le64 reserved[30];
 467         u8 sys_chunk_array[BTRFS_SYSTEM_CHUNK_ARRAY_SIZE];
 468         struct btrfs_root_backup super_roots[BTRFS_NUM_BACKUP_ROOTS];
 469 } __attribute__ ((__packed__));
 470
 471 /*
 472  * Compat flags that we support.  If any incompat flags are set other than the
 473  * ones specified below then we will fail to mount
 474  */
 475 #define BTRFS_FEATURE_COMPAT_RO_FREE_SPACE_TREE (1ULL << 0)
 476 /*
 477  * Older kernels on big-endian systems produced broken free space tree bitmaps,
 478  * and btrfs-progs also used to corrupt the free space tree. If this bit is
 479  * clear, then the free space tree cannot be trusted. btrfs-progs can also
 480  * intentionally clear this bit to ask the kernel to rebuild the free space
 481  * tree.
 482  */
 483 #define BTRFS_FEATURE_COMPAT_RO_FREE_SPACE_TREE_VALID   (1ULL << 1)
 484
 485 #define BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF    (1ULL << 0)
 486 #define BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL   (1ULL << 1)
 487 #define BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS     (1ULL << 2)
 488 #define BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO     (1ULL << 3)
 489 #define BTRFS_FEATURE_INCOMPAT_COMPRESS_ZSTD    (1ULL << 4)
 490
 491 /*
 492  * older kernels tried to do bigger metadata blocks, but the
 493  * code was pretty buggy.  Lets not let them try anymore.
 494  */
 495 #define BTRFS_FEATURE_INCOMPAT_BIG_METADATA     (1ULL << 5)
 496 #define BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF    (1ULL << 6)
 497 #define BTRFS_FEATURE_INCOMPAT_RAID56           (1ULL << 7)
 498 #define BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA  (1ULL << 8)
 499 #define BTRFS_FEATURE_INCOMPAT_NO_HOLES         (1ULL << 9)
 500
 501 #define BTRFS_FEATURE_COMPAT_SUPP               0ULL
 502
 503 /*
 504  * The FREE_SPACE_TREE and FREE_SPACE_TREE_VALID compat_ro bits must not be
 505  * added here until read-write support for the free space tree is implemented in
 506  * btrfs-progs.
 507  */
 508 #define BTRFS_FEATURE_COMPAT_RO_SUPP            0ULL
 509
 510 #define BTRFS_FEATURE_INCOMPAT_SUPP                     \
 511         (BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF |         \
 512          BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL |        \
 513          BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO |          \
 514          BTRFS_FEATURE_INCOMPAT_COMPRESS_ZSTD |         \
 515          BTRFS_FEATURE_INCOMPAT_BIG_METADATA |          \
 516          BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF |         \
 517          BTRFS_FEATURE_INCOMPAT_RAID56 |                \
 518          BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS |          \
 519          BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA |       \
 520          BTRFS_FEATURE_INCOMPAT_NO_HOLES)
 521
 522 /*
 523  * A leaf is full of items. offset and size tell us where to find
 524  * the item in the leaf (relative to the start of the data area)
 525  */
 526 struct btrfs_item {
 527         struct btrfs_disk_key key;
 528         __le32 offset;
 529         __le32 size;
 530 } __attribute__ ((__packed__));
 531
 532 /*
 533  * leaves have an item area and a data area:
 534  * [item0, item1....itemN] [free space] [dataN...data1, data0]
 535  *
 536  * The data is separate from the items to get the keys closer together
 537  * during searches.
 538  */
 539 struct btrfs_leaf {
 540         struct btrfs_header header;
 541         struct btrfs_item items[];
 542 } __attribute__ ((__packed__));
 543
 544 /*
 545  * all non-leaf blocks are nodes, they hold only keys and pointers to
 546  * other blocks
 547  */
 548 struct btrfs_key_ptr {
 549         struct btrfs_disk_key key;
 550         __le64 blockptr;
 551         __le64 generation;
 552 } __attribute__ ((__packed__));
 553
 554 struct btrfs_node {
 555         struct btrfs_header header;
 556         struct btrfs_key_ptr ptrs[];
 557 } __attribute__ ((__packed__));
 558
 559 /*
 560  * btrfs_paths remember the path taken from the root down to the leaf.
 561  * level 0 is always the leaf, and nodes[1...BTRFS_MAX_LEVEL] will point
 562  * to any other levels that are present.
 563  *
 564  * The slots array records the index of the item or block pointer
 565  * used while walking the tree.
 566  */
 567
 568 struct btrfs_path {
 569         struct extent_buffer *nodes[BTRFS_MAX_LEVEL];
 570         int slots[BTRFS_MAX_LEVEL];
 571 #if 0
 572         /* The kernel locking sheme is not done in userspace. */
 573         int locks[BTRFS_MAX_LEVEL];
 574 #endif
 575         signed char reada;
 576         /* keep some upper locks as we walk down */
 577         u8 lowest_level;
 578
 579         /*
 580          * set by btrfs_split_item, tells search_slot to keep all locks
 581          * and to force calls to keep space in the nodes
 582          */
 583         u8 search_for_split;
 584         u8 skip_check_block;
 585 };
 586
 587 /*
 588  * items in the extent btree are used to record the objectid of the
 589  * owner of the block and the number of references
 590  */
 591
 592 struct btrfs_extent_item {
 593         __le64 refs;
 594         __le64 generation;
 595         __le64 flags;
 596 } __attribute__ ((__packed__));
 597
 598 struct btrfs_extent_item_v0 {
 599         __le32 refs;
 600 } __attribute__ ((__packed__));
 601
 602 #define BTRFS_MAX_EXTENT_ITEM_SIZE(r) ((BTRFS_LEAF_DATA_SIZE(r) >> 4) - \
 603                                         sizeof(struct btrfs_item))
 604 #define BTRFS_MAX_EXTENT_SIZE           SZ_128M
 605
 606 #define BTRFS_EXTENT_FLAG_DATA          (1ULL << 0)
 607 #define BTRFS_EXTENT_FLAG_TREE_BLOCK    (1ULL << 1)
 608
 609 /* following flags only apply to tree blocks */
 610
 611 /* use full backrefs for extent pointers in the block*/
 612 #define BTRFS_BLOCK_FLAG_FULL_BACKREF   (1ULL << 8)
 613
 614 struct btrfs_tree_block_info {
 615         struct btrfs_disk_key key;
 616         u8 level;
 617 } __attribute__ ((__packed__));
 618
 619 struct btrfs_extent_data_ref {
 620         __le64 root;
 621         __le64 objectid;
 622         __le64 offset;
 623         __le32 count;
 624 } __attribute__ ((__packed__));
 625
 626 struct btrfs_shared_data_ref {
 627         __le32 count;
 628 } __attribute__ ((__packed__));
 629
 630 struct btrfs_extent_inline_ref {
 631         u8 type;
 632         __le64 offset;
 633 } __attribute__ ((__packed__));
 634
 635 struct btrfs_extent_ref_v0 {
 636         __le64 root;
 637         __le64 generation;
 638         __le64 objectid;
 639         __le32 count;
 640 } __attribute__ ((__packed__));
 641
 642 /* dev extents record free space on individual devices.  The owner
 643  * field points back to the chunk allocation mapping tree that allocated
 644  * the extent.  The chunk tree uuid field is a way to double check the owner
 645  */
 646 struct btrfs_dev_extent {
 647         __le64 chunk_tree;
 648         __le64 chunk_objectid;
 649         __le64 chunk_offset;
 650         __le64 length;
 651         u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
 652 } __attribute__ ((__packed__));
 653
 654 struct btrfs_inode_ref {
 655         __le64 index;
 656         __le16 name_len;
 657         /* name goes here */
 658 } __attribute__ ((__packed__));
 659
 660 struct btrfs_inode_extref {
 661         __le64 parent_objectid;
 662         __le64 index;
 663         __le16 name_len;
 664         __u8   name[0]; /* name goes here */
 665 } __attribute__ ((__packed__));
 666
 667 struct btrfs_timespec {
 668         __le64 sec;
 669         __le32 nsec;
 670 } __attribute__ ((__packed__));
 671
 672 typedef enum {
 673         BTRFS_COMPRESS_NONE  = 0,
 674         BTRFS_COMPRESS_ZLIB  = 1,
 675         BTRFS_COMPRESS_LZO   = 2,
 676         BTRFS_COMPRESS_ZSTD  = 3,
 677         BTRFS_COMPRESS_TYPES = 3,
 678         BTRFS_COMPRESS_LAST  = 4,
 679 } btrfs_compression_type;
 680
 681 /* we don't understand any encryption methods right now */
 682 typedef enum {
 683         BTRFS_ENCRYPTION_NONE = 0,
 684         BTRFS_ENCRYPTION_LAST = 1,
 685 } btrfs_encryption_type;
 686
 687 enum btrfs_tree_block_status {
 688         BTRFS_TREE_BLOCK_CLEAN,
 689         BTRFS_TREE_BLOCK_INVALID_NRITEMS,
 690         BTRFS_TREE_BLOCK_INVALID_PARENT_KEY,
 691         BTRFS_TREE_BLOCK_BAD_KEY_ORDER,
 692         BTRFS_TREE_BLOCK_INVALID_LEVEL,
 693         BTRFS_TREE_BLOCK_INVALID_FREE_SPACE,
 694         BTRFS_TREE_BLOCK_INVALID_OFFSETS,
 695 };
 696
 697 struct btrfs_inode_item {
 698         /* nfs style generation number */
 699         __le64 generation;
 700         /* transid that last touched this inode */
 701         __le64 transid;
 702         __le64 size;
 703         __le64 nbytes;
 704         __le64 block_group;
 705         __le32 nlink;
 706         __le32 uid;
 707         __le32 gid;
 708         __le32 mode;
 709         __le64 rdev;
 710         __le64 flags;
 711
 712         /* modification sequence number for NFS */
 713         __le64 sequence;
 714
 715         /*
 716          * a little future expansion, for more than this we can
 717          * just grow the inode item and version it
 718          */
 719         __le64 reserved[4];
 720         struct btrfs_timespec atime;
 721         struct btrfs_timespec ctime;
 722         struct btrfs_timespec mtime;
 723         struct btrfs_timespec otime;
 724 } __attribute__ ((__packed__));
 725
 726 struct btrfs_dir_log_item {
 727         __le64 end;
 728 } __attribute__ ((__packed__));
 729
 730 struct btrfs_dir_item {
 731         struct btrfs_disk_key location;
 732         __le64 transid;
 733         __le16 data_len;
 734         __le16 name_len;
 735         u8 type;
 736 } __attribute__ ((__packed__));
 737
 738 struct btrfs_root_item_v0 {
 739         struct btrfs_inode_item inode;
 740         __le64 generation;
 741         __le64 root_dirid;
 742         __le64 bytenr;
 743         __le64 byte_limit;
 744         __le64 bytes_used;
 745         __le64 last_snapshot;
 746         __le64 flags;
 747         __le32 refs;
 748         struct btrfs_disk_key drop_progress;
 749         u8 drop_level;
 750         u8 level;
 751 } __attribute__ ((__packed__));
 752
 753 struct btrfs_root_item {
 754         struct btrfs_inode_item inode;
 755         __le64 generation;
 756         __le64 root_dirid;
 757         __le64 bytenr;
 758         __le64 byte_limit;
 759         __le64 bytes_used;
 760         __le64 last_snapshot;
 761         __le64 flags;
 762         __le32 refs;
 763         struct btrfs_disk_key drop_progress;
 764         u8 drop_level;
 765         u8 level;
 766
 767         /*
 768          * The following fields appear after subvol_uuids+subvol_times
 769          * were introduced.
 770          */
 771
 772         /*
 773          * This generation number is used to test if the new fields are valid
 774          * and up to date while reading the root item. Every time the root item
 775          * is written out, the "generation" field is copied into this field. If
 776          * anyone ever mounted the fs with an older kernel, we will have
 777          * mismatching generation values here and thus must invalidate the
 778          * new fields. See btrfs_update_root and btrfs_find_last_root for
 779          * details.
 780          * the offset of generation_v2 is also used as the start for the memset
 781          * when invalidating the fields.
 782          */
 783         __le64 generation_v2;
 784         u8 uuid[BTRFS_UUID_SIZE];
 785         u8 parent_uuid[BTRFS_UUID_SIZE];
 786         u8 received_uuid[BTRFS_UUID_SIZE];
 787         __le64 ctransid; /* updated when an inode changes */
 788         __le64 otransid; /* trans when created */
 789         __le64 stransid; /* trans when sent. non-zero for received subvol */
 790         __le64 rtransid; /* trans when received. non-zero for received subvol */
 791         struct btrfs_timespec ctime;
 792         struct btrfs_timespec otime;
 793         struct btrfs_timespec stime;
 794         struct btrfs_timespec rtime;
 795         __le64 reserved[8]; /* for future */
 796 } __attribute__ ((__packed__));
 797
 798 /*
 799  * this is used for both forward and backward root refs
 800  */
 801 struct btrfs_root_ref {
 802         __le64 dirid;
 803         __le64 sequence;
 804         __le16 name_len;
 805 } __attribute__ ((__packed__));
 806
 807 struct btrfs_disk_balance_args {
 808         /*
 809          * profiles to operate on, single is denoted by
 810          * BTRFS_AVAIL_ALLOC_BIT_SINGLE
 811          */
 812         __le64 profiles;
 813
 814         /*
 815          * usage filter
 816          * BTRFS_BALANCE_ARGS_USAGE with a single value means '0..N'
 817          * BTRFS_BALANCE_ARGS_USAGE_RANGE - range syntax, min..max
 818          */
 819         union {
 820                 __le64 usage;
 821                 struct {
 822                         __le32 usage_min;
 823                         __le32 usage_max;
 824                 };
 825         };
 826
 827         /* devid filter */
 828         __le64 devid;
 829
 830         /* devid subset filter [pstart..pend) */
 831         __le64 pstart;
 832         __le64 pend;
 833
 834         /* btrfs virtual address space subset filter [vstart..vend) */
 835         __le64 vstart;
 836         __le64 vend;
 837
 838         /*
 839          * profile to convert to, single is denoted by
 840          * BTRFS_AVAIL_ALLOC_BIT_SINGLE
 841          */
 842         __le64 target;
 843
 844         /* BTRFS_BALANCE_ARGS_* */
 845         __le64 flags;
 846
 847         /*
 848          * BTRFS_BALANCE_ARGS_LIMIT with value 'limit'
 849          * BTRFS_BALANCE_ARGS_LIMIT_RANGE - the extend version can use minimum
 850          * and maximum
 851          */
 852         union {
 853                 __le64 limit;
 854                 struct {
 855                         __le32 limit_min;
 856                         __le32 limit_max;
 857                 };
 858         };
 859
 860         /*
 861          * Process chunks that cross stripes_min..stripes_max devices,
 862          * BTRFS_BALANCE_ARGS_STRIPES_RANGE
 863          */
 864         __le32 stripes_min;
 865         __le32 stripes_max;
 866
 867         __le64 unused[6];
 868 } __attribute__ ((__packed__));
 869
 870 /*
 871  * store balance parameters to disk so that balance can be properly
 872  * resumed after crash or unmount
 873  */
 874 struct btrfs_balance_item {
 875         /* BTRFS_BALANCE_* */
 876         __le64 flags;
 877
 878         struct btrfs_disk_balance_args data;
 879         struct btrfs_disk_balance_args meta;
 880         struct btrfs_disk_balance_args sys;
 881
 882         __le64 unused[4];
 883 } __attribute__ ((__packed__));
 884
 885 #define BTRFS_FILE_EXTENT_INLINE 0
 886 #define BTRFS_FILE_EXTENT_REG 1
 887 #define BTRFS_FILE_EXTENT_PREALLOC 2
 888
 889 struct btrfs_file_extent_item {
 890         /*
 891          * transaction id that created this extent
 892          */
 893         __le64 generation;
 894         /*
 895          * max number of bytes to hold this extent in ram
 896          * when we split a compressed extent we can't know how big
 897          * each of the resulting pieces will be.  So, this is
 898          * an upper limit on the size of the extent in ram instead of
 899          * an exact limit.
 900          */
 901         __le64 ram_bytes;
 902
 903         /*
 904          * 32 bits for the various ways we might encode the data,
 905          * including compression and encryption.  If any of these
 906          * are set to something a given disk format doesn't understand
 907          * it is treated like an incompat flag for reading and writing,
 908          * but not for stat.
 909          */
 910         u8 compression;
 911         u8 encryption;
 912         __le16 other_encoding; /* spare for later use */
 913
 914         /* are we inline data or a real extent? */
 915         u8 type;
 916
 917         /*
 918          * disk space consumed by the extent, checksum blocks are included
 919          * in these numbers
 920          */
 921         __le64 disk_bytenr;
 922         __le64 disk_num_bytes;
 923         /*
 924          * the logical offset in file blocks (no csums)
 925          * this extent record is for.  This allows a file extent to point
 926          * into the middle of an existing extent on disk, sharing it
 927          * between two snapshots (useful if some bytes in the middle of the
 928          * extent have changed
 929          */
 930         __le64 offset;
 931         /*
 932          * the logical number of file blocks (no csums included)
 933          */
 934         __le64 num_bytes;
 935
 936 } __attribute__ ((__packed__));
 937
 938 struct btrfs_dev_stats_item {
 939         /*
 940          * grow this item struct at the end for future enhancements and keep
 941          * the existing values unchanged
 942          */
 943         __le64 values[BTRFS_DEV_STAT_VALUES_MAX];
 944 } __attribute__ ((__packed__));
 945
 946 struct btrfs_csum_item {
 947         u8 csum;
 948 } __attribute__ ((__packed__));
 949
 950 /*
 951  * We don't want to overwrite 1M at the beginning of device, even though
 952  * there is our 1st superblock at 64k. Some possible reasons:
 953  *  - the first 64k blank is useful for some boot loader/manager
 954  *  - the first 1M could be scratched by buggy partitioner or somesuch
 955  */
 956 #define BTRFS_BLOCK_RESERVED_1M_FOR_SUPER       ((u64)SZ_1M)
 957
 958 /* tag for the radix tree of block groups in ram */
 959 #define BTRFS_BLOCK_GROUP_DATA          (1ULL << 0)
 960 #define BTRFS_BLOCK_GROUP_SYSTEM        (1ULL << 1)
 961 #define BTRFS_BLOCK_GROUP_METADATA      (1ULL << 2)
 962 #define BTRFS_BLOCK_GROUP_RAID0         (1ULL << 3)
 963 #define BTRFS_BLOCK_GROUP_RAID1         (1ULL << 4)
 964 #define BTRFS_BLOCK_GROUP_DUP           (1ULL << 5)
 965 #define BTRFS_BLOCK_GROUP_RAID10        (1ULL << 6)
 966 #define BTRFS_BLOCK_GROUP_RAID5         (1ULL << 7)
 967 #define BTRFS_BLOCK_GROUP_RAID6         (1ULL << 8)
 968 #define BTRFS_BLOCK_GROUP_RESERVED      BTRFS_AVAIL_ALLOC_BIT_SINGLE
 969 #define BTRFS_NR_RAID_TYPES             7
 970
 971 #define BTRFS_BLOCK_GROUP_TYPE_MASK     (BTRFS_BLOCK_GROUP_DATA |    \
 972                                          BTRFS_BLOCK_GROUP_SYSTEM |  \
 973                                          BTRFS_BLOCK_GROUP_METADATA)
 974
 975 #define BTRFS_BLOCK_GROUP_PROFILE_MASK  (BTRFS_BLOCK_GROUP_RAID0 |   \
 976                                          BTRFS_BLOCK_GROUP_RAID1 |   \
 977                                          BTRFS_BLOCK_GROUP_RAID5 |   \
 978                                          BTRFS_BLOCK_GROUP_RAID6 |   \
 979                                          BTRFS_BLOCK_GROUP_DUP |     \
 980                                          BTRFS_BLOCK_GROUP_RAID10)
 981
 982 /* used in struct btrfs_balance_args fields */
 983 #define BTRFS_AVAIL_ALLOC_BIT_SINGLE    (1ULL << 48)
 984
 985 /*
 986  * GLOBAL_RSV does not exist as a on-disk block group type and is used
 987  * internally for exporting info about global block reserve from space infos
 988  */
 989 #define BTRFS_SPACE_INFO_GLOBAL_RSV    (1ULL << 49)
 990
 991 #define BTRFS_QGROUP_LEVEL_SHIFT                48
 992
 993 static inline u64 btrfs_qgroup_level(u64 qgroupid)
 994 {
 995         return qgroupid >> BTRFS_QGROUP_LEVEL_SHIFT;
 996 }
 997
 998 static inline u64 btrfs_qgroup_subvid(u64 qgroupid)
 999 {
1000         return qgroupid & ((1ULL << BTRFS_QGROUP_LEVEL_SHIFT) - 1);
1001 }
1002
1003 #define BTRFS_QGROUP_STATUS_FLAG_ON             (1ULL << 0)
1004 #define BTRFS_QGROUP_STATUS_FLAG_RESCAN         (1ULL << 1)
1005 #define BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT   (1ULL << 2)
1006
1007 struct btrfs_qgroup_status_item {
1008         __le64 version;
1009         __le64 generation;
1010         __le64 flags;
1011         __le64 rescan;          /* progress during scanning */
1012 } __attribute__ ((__packed__));
1013
1014 struct btrfs_block_group_item {
1015         __le64 used;
1016         __le64 chunk_objectid;
1017         __le64 flags;
1018 } __attribute__ ((__packed__));
1019
1020 struct btrfs_free_space_info {
1021         __le32 extent_count;
1022         __le32 flags;
1023 } __attribute__ ((__packed__));
1024
1025 #define BTRFS_FREE_SPACE_USING_BITMAPS (1ULL << 0)
1026
1027 struct btrfs_qgroup_info_item {
1028         __le64 generation;
1029         __le64 referenced;
1030         __le64 referenced_compressed;
1031         __le64 exclusive;
1032         __le64 exclusive_compressed;
1033 } __attribute__ ((__packed__));
1034
1035 /* flags definition for qgroup limits */
1036 #define BTRFS_QGROUP_LIMIT_MAX_RFER     (1ULL << 0)
1037 #define BTRFS_QGROUP_LIMIT_MAX_EXCL     (1ULL << 1)
1038 #define BTRFS_QGROUP_LIMIT_RSV_RFER     (1ULL << 2)
1039 #define BTRFS_QGROUP_LIMIT_RSV_EXCL     (1ULL << 3)
1040 #define BTRFS_QGROUP_LIMIT_RFER_CMPR    (1ULL << 4)
1041 #define BTRFS_QGROUP_LIMIT_EXCL_CMPR    (1ULL << 5)
1042
1043 struct btrfs_qgroup_limit_item {
1044         __le64 flags;
1045         __le64 max_referenced;
1046         __le64 max_exclusive;
1047         __le64 rsv_referenced;
1048         __le64 rsv_exclusive;
1049 } __attribute__ ((__packed__));
1050
1051 struct btrfs_space_info {
1052         u64 flags;
1053         u64 total_bytes;
1054         u64 bytes_used;
1055         u64 bytes_pinned;
1056         int full;
1057         struct list_head list;
1058 };
1059
1060 struct btrfs_block_group_cache {
1061         struct cache_extent cache;
1062         struct btrfs_key key;
1063         struct btrfs_block_group_item item;
1064         struct btrfs_space_info *space_info;
1065         struct btrfs_free_space_ctl *free_space_ctl;
1066         u64 bytes_super;
1067         u64 pinned;
1068         u64 flags;
1069         int cached;
1070         int ro;
1071 };
1072
1073 struct btrfs_device;
1074 struct btrfs_fs_devices;
1075 struct btrfs_fs_info {
1076         u8 fsid[BTRFS_FSID_SIZE];
1077         u8 *new_fsid;
1078         u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
1079         u8 *new_chunk_tree_uuid;
1080         struct btrfs_root *fs_root;
1081         struct btrfs_root *extent_root;
1082         struct btrfs_root *tree_root;
1083         struct btrfs_root *chunk_root;
1084         struct btrfs_root *dev_root;
1085         struct btrfs_root *csum_root;
1086         struct btrfs_root *quota_root;
1087         struct btrfs_root *free_space_root;
1088
1089         struct rb_root fs_root_tree;
1090
1091         /* the log root tree is a directory of all the other log roots */
1092         struct btrfs_root *log_root_tree;
1093
1094         struct extent_io_tree extent_cache;
1095         struct extent_io_tree free_space_cache;
1096         struct extent_io_tree block_group_cache;
1097         struct extent_io_tree pinned_extents;
1098         struct extent_io_tree pending_del;
1099         struct extent_io_tree extent_ins;
1100         struct extent_io_tree *excluded_extents;
1101
1102         /* logical->physical extent mapping */
1103         struct btrfs_mapping_tree mapping_tree;
1104
1105         u64 generation;
1106         u64 last_trans_committed;
1107
1108         u64 avail_data_alloc_bits;
1109         u64 avail_metadata_alloc_bits;
1110         u64 avail_system_alloc_bits;
1111         u64 data_alloc_profile;
1112         u64 metadata_alloc_profile;
1113         u64 system_alloc_profile;
1114         u64 alloc_start;
1115
1116         struct btrfs_trans_handle *running_transaction;
1117         struct btrfs_super_block *super_copy;
1118         struct mutex fs_mutex;
1119
1120         u64 super_bytenr;
1121         u64 total_pinned;
1122
1123         struct list_head dirty_cowonly_roots;
1124         struct list_head recow_ebs;
1125
1126         struct btrfs_fs_devices *fs_devices;
1127         struct list_head space_info;
1128
1129         unsigned int system_allocs:1;
1130         unsigned int readonly:1;
1131         unsigned int on_restoring:1;
1132         unsigned int is_chunk_recover:1;
1133         unsigned int quota_enabled:1;
1134         unsigned int suppress_check_block_errors:1;
1135         unsigned int ignore_fsid_mismatch:1;
1136         unsigned int ignore_chunk_tree_error:1;
1137         unsigned int avoid_meta_chunk_alloc:1;
1138         unsigned int avoid_sys_chunk_alloc:1;
1139         unsigned int finalize_on_close:1;
1140
1141         int transaction_aborted;
1142
1143         int (*free_extent_hook)(struct btrfs_trans_handle *trans,
1144                                 struct btrfs_root *root,
1145                                 u64 bytenr, u64 num_bytes, u64 parent,
1146                                 u64 root_objectid, u64 owner, u64 offset,
1147                                 int refs_to_drop);
1148         struct cache_tree *fsck_extent_cache;
1149         struct cache_tree *corrupt_blocks;
1150
1151         /* Cached block sizes */
1152         u32 nodesize;
1153         u32 sectorsize;
1154         u32 stripesize;
1155 };
1156
1157 /*
1158  * in ram representation of the tree.  extent_root is used for all allocations
1159  * and for the extent tree extent_root root.
1160  */
1161 struct btrfs_root {
1162         struct extent_buffer *node;
1163         struct extent_buffer *commit_root;
1164         struct btrfs_root_item root_item;
1165         struct btrfs_key root_key;
1166         struct btrfs_fs_info *fs_info;
1167         u64 objectid;
1168         u64 last_trans;
1169
1170         int ref_cows;
1171         int track_dirty;
1172
1173
1174         u32 type;
1175         u64 last_inode_alloc;
1176
1177         /*
1178          * Record orphan data extent ref
1179          *
1180          * TODO: Don't restore things in btrfs_root.
1181          * Directly record it into inode_record, which needs a lot of
1182          * infrastructure change to allow cooperation between extent
1183          * and fs tree scan.
1184          */
1185         struct list_head orphan_data_extents;
1186
1187         /* the dirty list is only used by non-reference counted roots */
1188         struct list_head dirty_list;
1189         struct rb_node rb_node;
1190 };
1191
1192 /*
1193  * inode items have the data typically returned from stat and store other
1194  * info about object characteristics.  There is one for every file and dir in
1195  * the FS
1196  */
1197 #define BTRFS_INODE_ITEM_KEY            1
1198 #define BTRFS_INODE_REF_KEY             12
1199 #define BTRFS_INODE_EXTREF_KEY          13
1200 #define BTRFS_XATTR_ITEM_KEY            24
1201 #define BTRFS_ORPHAN_ITEM_KEY           48
1202
1203 #define BTRFS_DIR_LOG_ITEM_KEY  60
1204 #define BTRFS_DIR_LOG_INDEX_KEY 72
1205 /*
1206  * dir items are the name -> inode pointers in a directory.  There is one
1207  * for every name in a directory.
1208  */
1209 #define BTRFS_DIR_ITEM_KEY      84
1210 #define BTRFS_DIR_INDEX_KEY     96
1211
1212 /*
1213  * extent data is for file data
1214  */
1215 #define BTRFS_EXTENT_DATA_KEY   108
1216
1217 /*
1218  * csum items have the checksums for data in the extents
1219  */
1220 #define BTRFS_CSUM_ITEM_KEY     120
1221 /*
1222  * extent csums are stored in a separate tree and hold csums for
1223  * an entire extent on disk.
1224  */
1225 #define BTRFS_EXTENT_CSUM_KEY   128
1226
1227 /*
1228  * root items point to tree roots.  There are typically in the root
1229  * tree used by the super block to find all the other trees
1230  */
1231 #define BTRFS_ROOT_ITEM_KEY     132
1232
1233 /*
1234  * root backrefs tie subvols and snapshots to the directory entries that
1235  * reference them
1236  */
1237 #define BTRFS_ROOT_BACKREF_KEY  144
1238
1239 /*
1240  * root refs make a fast index for listing all of the snapshots and
1241  * subvolumes referenced by a given root.  They point directly to the
1242  * directory item in the root that references the subvol
1243  */
1244 #define BTRFS_ROOT_REF_KEY      156
1245
1246 /*
1247  * extent items are in the extent map tree.  These record which blocks
1248  * are used, and how many references there are to each block
1249  */
1250 #define BTRFS_EXTENT_ITEM_KEY   168
1251
1252 /*
1253  * The same as the BTRFS_EXTENT_ITEM_KEY, except it's metadata we already know
1254  * the length, so we save the level in key->offset instead of the length.
1255  */
1256 #define BTRFS_METADATA_ITEM_KEY 169
1257
1258 #define BTRFS_TREE_BLOCK_REF_KEY        176
1259
1260 #define BTRFS_EXTENT_DATA_REF_KEY       178
1261
1262 /* old style extent backrefs */
1263 #define BTRFS_EXTENT_REF_V0_KEY         180
1264
1265 #define BTRFS_SHARED_BLOCK_REF_KEY      182
1266
1267 #define BTRFS_SHARED_DATA_REF_KEY       184
1268
1269
1270 /*
1271  * block groups give us hints into the extent allocation trees.  Which
1272  * blocks are free etc etc
1273  */
1274 #define BTRFS_BLOCK_GROUP_ITEM_KEY 192
1275
1276 /*
1277  * Every block group is represented in the free space tree by a free space info
1278  * item, which stores some accounting information. It is keyed on
1279  * (block_group_start, FREE_SPACE_INFO, block_group_length).
1280  */
1281 #define BTRFS_FREE_SPACE_INFO_KEY 198
1282
1283 /*
1284  * A free space extent tracks an extent of space that is free in a block group.
1285  * It is keyed on (start, FREE_SPACE_EXTENT, length).
1286  */
1287 #define BTRFS_FREE_SPACE_EXTENT_KEY 199
1288
1289 /*
1290  * When a block group becomes very fragmented, we convert it to use bitmaps
1291  * instead of extents. A free space bitmap is keyed on
1292  * (start, FREE_SPACE_BITMAP, length); the corresponding item is a bitmap with
1293  * (length / sectorsize) bits.
1294  */
1295 #define BTRFS_FREE_SPACE_BITMAP_KEY 200
1296
1297 #define BTRFS_DEV_EXTENT_KEY    204
1298 #define BTRFS_DEV_ITEM_KEY      216
1299 #define BTRFS_CHUNK_ITEM_KEY    228
1300
1301 #define BTRFS_BALANCE_ITEM_KEY  248
1302
1303 /*
1304  * quota groups
1305  */
1306 #define BTRFS_QGROUP_STATUS_KEY         240
1307 #define BTRFS_QGROUP_INFO_KEY           242
1308 #define BTRFS_QGROUP_LIMIT_KEY          244
1309 #define BTRFS_QGROUP_RELATION_KEY       246
1310
1311 /*
1312  * Obsolete name, see BTRFS_TEMPORARY_ITEM_KEY.
1313  */
1314 #define BTRFS_BALANCE_ITEM_KEY  248
1315
1316 /*
1317  * The key type for tree items that are stored persistently, but do not need to
1318  * exist for extended period of time. The items can exist in any tree.
1319  *
1320  * [subtype, BTRFS_TEMPORARY_ITEM_KEY, data]
1321  *
1322  * Existing items:
1323  *
1324  * - balance status item
1325  *   (BTRFS_BALANCE_OBJECTID, BTRFS_TEMPORARY_ITEM_KEY, 0)
1326  */
1327 #define BTRFS_TEMPORARY_ITEM_KEY        248
1328
1329 /*
1330  * Obsolete name, see BTRFS_PERSISTENT_ITEM_KEY
1331  */
1332 #define BTRFS_DEV_STATS_KEY             249
1333
1334 /*
1335  * The key type for tree items that are stored persistently and usually exist
1336  * for a long period, eg. filesystem lifetime. The item kinds can be status
1337  * information, stats or preference values. The item can exist in any tree.
1338  *
1339  * [subtype, BTRFS_PERSISTENT_ITEM_KEY, data]
1340  *
1341  * Existing items:
1342  *
1343  * - device statistics, store IO stats in the device tree, one key for all
1344  *   stats
1345  *   (BTRFS_DEV_STATS_OBJECTID, BTRFS_DEV_STATS_KEY, 0)
1346  */
1347 #define BTRFS_PERSISTENT_ITEM_KEY       249
1348
1349 /*
1350  * Persistently stores the device replace state in the device tree.
1351  * The key is built like this: (0, BTRFS_DEV_REPLACE_KEY, 0).
1352  */
1353 #define BTRFS_DEV_REPLACE_KEY   250
1354
1355 /*
1356  * Stores items that allow to quickly map UUIDs to something else.
1357  * These items are part of the filesystem UUID tree.
1358  * The key is built like this:
1359  * (UUID_upper_64_bits, BTRFS_UUID_KEY*, UUID_lower_64_bits).
1360  */
1361 #if BTRFS_UUID_SIZE != 16
1362 #error "UUID items require BTRFS_UUID_SIZE == 16!"
1363 #endif
1364 #define BTRFS_UUID_KEY_SUBVOL   251     /* for UUIDs assigned to subvols */
1365 #define BTRFS_UUID_KEY_RECEIVED_SUBVOL  252     /* for UUIDs assigned to
1366                                                  * received subvols */
1367
1368 /*
1369  * string items are for debugging.  They just store a short string of
1370  * data in the FS
1371  */
1372 #define BTRFS_STRING_ITEM_KEY   253
1373 /*
1374  * Inode flags
1375  */
1376 #define BTRFS_INODE_NODATASUM           (1 << 0)
1377 #define BTRFS_INODE_NODATACOW           (1 << 1)
1378 #define BTRFS_INODE_READONLY            (1 << 2)
1379 #define BTRFS_INODE_NOCOMPRESS          (1 << 3)
1380 #define BTRFS_INODE_PREALLOC            (1 << 4)
1381 #define BTRFS_INODE_SYNC                (1 << 5)
1382 #define BTRFS_INODE_IMMUTABLE           (1 << 6)
1383 #define BTRFS_INODE_APPEND              (1 << 7)
1384 #define BTRFS_INODE_NODUMP              (1 << 8)
1385 #define BTRFS_INODE_NOATIME             (1 << 9)
1386 #define BTRFS_INODE_DIRSYNC             (1 << 10)
1387 #define BTRFS_INODE_COMPRESS            (1 << 11)
1388
1389 #define read_eb_member(eb, ptr, type, member, result) (                 \
1390         read_extent_buffer(eb, (char *)(result),                        \
1391                            ((unsigned long)(ptr)) +                     \
1392                             offsetof(type, member),                     \
1393                            sizeof(((type *)0)->member)))
1394
1395 #define write_eb_member(eb, ptr, type, member, result) (                \
1396         write_extent_buffer(eb, (char *)(result),                       \
1397                            ((unsigned long)(ptr)) +                     \
1398                             offsetof(type, member),                     \
1399                            sizeof(((type *)0)->member)))
1400
1401 #define BTRFS_SETGET_HEADER_FUNCS(name, type, member, bits)             \
1402 static inline u##bits btrfs_##name(const struct extent_buffer *eb)      \
1403 {                                                                       \
1404         const struct btrfs_header *h = (struct btrfs_header *)eb->data; \
1405         return le##bits##_to_cpu(h->member);                            \
1406 }                                                                       \
1407 static inline void btrfs_set_##name(struct extent_buffer *eb,           \
1408                                     u##bits val)                        \
1409 {                                                                       \
1410         struct btrfs_header *h = (struct btrfs_header *)eb->data;       \
1411         h->member = cpu_to_le##bits(val);                               \
1412 }
1413
1414 #define BTRFS_SETGET_FUNCS(name, type, member, bits)                    \
1415 static inline u##bits btrfs_##name(const struct extent_buffer *eb,      \
1416                                    const type *s)                       \
1417 {                                                                       \
1418         unsigned long offset = (unsigned long)s;                        \
1419         const type *p = (type *) (eb->data + offset);                   \
1420         return get_unaligned_le##bits(&p->member);                      \
1421 }                                                                       \
1422 static inline void btrfs_set_##name(struct extent_buffer *eb,           \
1423                                     type *s, u##bits val)               \
1424 {                                                                       \
1425         unsigned long offset = (unsigned long)s;                        \
1426         type *p = (type *) (eb->data + offset);                         \
1427         put_unaligned_le##bits(val, &p->member);                        \
1428 }
1429
1430 #define BTRFS_SETGET_STACK_FUNCS(name, type, member, bits)              \
1431 static inline u##bits btrfs_##name(const type *s)                       \
1432 {                                                                       \
1433         return le##bits##_to_cpu(s->member);                            \
1434 }                                                                       \
1435 static inline void btrfs_set_##name(type *s, u##bits val)               \
1436 {                                                                       \
1437         s->member = cpu_to_le##bits(val);                               \
1438 }
1439
1440 BTRFS_SETGET_FUNCS(device_type, struct btrfs_dev_item, type, 64);
1441 BTRFS_SETGET_FUNCS(device_total_bytes, struct btrfs_dev_item, total_bytes, 64);
1442 BTRFS_SETGET_FUNCS(device_bytes_used, struct btrfs_dev_item, bytes_used, 64);
1443 BTRFS_SETGET_FUNCS(device_io_align, struct btrfs_dev_item, io_align, 32);
1444 BTRFS_SETGET_FUNCS(device_io_width, struct btrfs_dev_item, io_width, 32);
1445 BTRFS_SETGET_FUNCS(device_start_offset, struct btrfs_dev_item,
1446                    start_offset, 64);
1447 BTRFS_SETGET_FUNCS(device_sector_size, struct btrfs_dev_item, sector_size, 32);
1448 BTRFS_SETGET_FUNCS(device_id, struct btrfs_dev_item, devid, 64);
1449 BTRFS_SETGET_FUNCS(device_group, struct btrfs_dev_item, dev_group, 32);
1450 BTRFS_SETGET_FUNCS(device_seek_speed, struct btrfs_dev_item, seek_speed, 8);
1451 BTRFS_SETGET_FUNCS(device_bandwidth, struct btrfs_dev_item, bandwidth, 8);
1452 BTRFS_SETGET_FUNCS(device_generation, struct btrfs_dev_item, generation, 64);
1453
1454 BTRFS_SETGET_STACK_FUNCS(stack_device_type, struct btrfs_dev_item, type, 64);
1455 BTRFS_SETGET_STACK_FUNCS(stack_device_total_bytes, struct btrfs_dev_item,
1456                          total_bytes, 64);
1457 BTRFS_SETGET_STACK_FUNCS(stack_device_bytes_used, struct btrfs_dev_item,
1458                          bytes_used, 64);
1459 BTRFS_SETGET_STACK_FUNCS(stack_device_io_align, struct btrfs_dev_item,
1460                          io_align, 32);
1461 BTRFS_SETGET_STACK_FUNCS(stack_device_io_width, struct btrfs_dev_item,
1462                          io_width, 32);
1463 BTRFS_SETGET_STACK_FUNCS(stack_device_sector_size, struct btrfs_dev_item,
1464                          sector_size, 32);
1465 BTRFS_SETGET_STACK_FUNCS(stack_device_id, struct btrfs_dev_item, devid, 64);
1466 BTRFS_SETGET_STACK_FUNCS(stack_device_group, struct btrfs_dev_item,
1467                          dev_group, 32);
1468 BTRFS_SETGET_STACK_FUNCS(stack_device_seek_speed, struct btrfs_dev_item,
1469                          seek_speed, 8);
1470 BTRFS_SETGET_STACK_FUNCS(stack_device_bandwidth, struct btrfs_dev_item,
1471                          bandwidth, 8);
1472 BTRFS_SETGET_STACK_FUNCS(stack_device_generation, struct btrfs_dev_item,
1473                          generation, 64);
1474
1475 static inline char *btrfs_device_uuid(struct btrfs_dev_item *d)
1476 {
1477         return (char *)d + offsetof(struct btrfs_dev_item, uuid);
1478 }
1479
1480 static inline char *btrfs_device_fsid(struct btrfs_dev_item *d)
1481 {
1482         return (char *)d + offsetof(struct btrfs_dev_item, fsid);
1483 }
1484
1485 BTRFS_SETGET_FUNCS(chunk_length, struct btrfs_chunk, length, 64);
1486 BTRFS_SETGET_FUNCS(chunk_owner, struct btrfs_chunk, owner, 64);
1487 BTRFS_SETGET_FUNCS(chunk_stripe_len, struct btrfs_chunk, stripe_len, 64);
1488 BTRFS_SETGET_FUNCS(chunk_io_align, struct btrfs_chunk, io_align, 32);
1489 BTRFS_SETGET_FUNCS(chunk_io_width, struct btrfs_chunk, io_width, 32);
1490 BTRFS_SETGET_FUNCS(chunk_sector_size, struct btrfs_chunk, sector_size, 32);
1491 BTRFS_SETGET_FUNCS(chunk_type, struct btrfs_chunk, type, 64);
1492 BTRFS_SETGET_FUNCS(chunk_num_stripes, struct btrfs_chunk, num_stripes, 16);
1493 BTRFS_SETGET_FUNCS(chunk_sub_stripes, struct btrfs_chunk, sub_stripes, 16);
1494 BTRFS_SETGET_FUNCS(stripe_devid, struct btrfs_stripe, devid, 64);
1495 BTRFS_SETGET_FUNCS(stripe_offset, struct btrfs_stripe, offset, 64);
1496
1497 static inline char *btrfs_stripe_dev_uuid(struct btrfs_stripe *s)
1498 {
1499         return (char *)s + offsetof(struct btrfs_stripe, dev_uuid);
1500 }
1501
1502 BTRFS_SETGET_STACK_FUNCS(stack_chunk_length, struct btrfs_chunk, length, 64);
1503 BTRFS_SETGET_STACK_FUNCS(stack_chunk_owner, struct btrfs_chunk, owner, 64);
1504 BTRFS_SETGET_STACK_FUNCS(stack_chunk_stripe_len, struct btrfs_chunk,
1505                          stripe_len, 64);
1506 BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_align, struct btrfs_chunk,
1507                          io_align, 32);
1508 BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_width, struct btrfs_chunk,
1509                          io_width, 32);
1510 BTRFS_SETGET_STACK_FUNCS(stack_chunk_sector_size, struct btrfs_chunk,
1511                          sector_size, 32);
1512 BTRFS_SETGET_STACK_FUNCS(stack_chunk_type, struct btrfs_chunk, type, 64);
1513 BTRFS_SETGET_STACK_FUNCS(stack_chunk_num_stripes, struct btrfs_chunk,
1514                          num_stripes, 16);
1515 BTRFS_SETGET_STACK_FUNCS(stack_chunk_sub_stripes, struct btrfs_chunk,
1516                          sub_stripes, 16);
1517 BTRFS_SETGET_STACK_FUNCS(stack_stripe_devid, struct btrfs_stripe, devid, 64);
1518 BTRFS_SETGET_STACK_FUNCS(stack_stripe_offset, struct btrfs_stripe, offset, 64);
1519
1520 static inline struct btrfs_stripe *btrfs_stripe_nr(struct btrfs_chunk *c,
1521                                                    int nr)
1522 {
1523         unsigned long offset = (unsigned long)c;
1524         offset += offsetof(struct btrfs_chunk, stripe);
1525         offset += nr * sizeof(struct btrfs_stripe);
1526         return (struct btrfs_stripe *)offset;
1527 }
1528
1529 static inline char *btrfs_stripe_dev_uuid_nr(struct btrfs_chunk *c, int nr)
1530 {
1531         return btrfs_stripe_dev_uuid(btrfs_stripe_nr(c, nr));
1532 }
1533
1534 static inline u64 btrfs_stripe_offset_nr(struct extent_buffer *eb,
1535                                          struct btrfs_chunk *c, int nr)
1536 {
1537         return btrfs_stripe_offset(eb, btrfs_stripe_nr(c, nr));
1538 }
1539
1540 static inline void btrfs_set_stripe_offset_nr(struct extent_buffer *eb,
1541                                              struct btrfs_chunk *c, int nr,
1542                                              u64 val)
1543 {
1544         btrfs_set_stripe_offset(eb, btrfs_stripe_nr(c, nr), val);
1545 }
1546
1547 static inline u64 btrfs_stripe_devid_nr(struct extent_buffer *eb,
1548                                          struct btrfs_chunk *c, int nr)
1549 {
1550         return btrfs_stripe_devid(eb, btrfs_stripe_nr(c, nr));
1551 }
1552
1553 static inline void btrfs_set_stripe_devid_nr(struct extent_buffer *eb,
1554                                              struct btrfs_chunk *c, int nr,
1555                                              u64 val)
1556 {
1557         btrfs_set_stripe_devid(eb, btrfs_stripe_nr(c, nr), val);
1558 }
1559
1560 /* struct btrfs_block_group_item */
1561 BTRFS_SETGET_STACK_FUNCS(block_group_used, struct btrfs_block_group_item,
1562                          used, 64);
1563 BTRFS_SETGET_FUNCS(disk_block_group_used, struct btrfs_block_group_item,
1564                          used, 64);
1565 BTRFS_SETGET_STACK_FUNCS(block_group_chunk_objectid,
1566                         struct btrfs_block_group_item, chunk_objectid, 64);
1567
1568 BTRFS_SETGET_FUNCS(disk_block_group_chunk_objectid,
1569                    struct btrfs_block_group_item, chunk_objectid, 64);
1570 BTRFS_SETGET_FUNCS(disk_block_group_flags,
1571                    struct btrfs_block_group_item, flags, 64);
1572 BTRFS_SETGET_STACK_FUNCS(block_group_flags,
1573                         struct btrfs_block_group_item, flags, 64);
1574
1575 /* struct btrfs_free_space_info */
1576 BTRFS_SETGET_FUNCS(free_space_extent_count, struct btrfs_free_space_info,
1577                    extent_count, 32);
1578 BTRFS_SETGET_FUNCS(free_space_flags, struct btrfs_free_space_info, flags, 32);
1579
1580 /* struct btrfs_inode_ref */
1581 BTRFS_SETGET_FUNCS(inode_ref_name_len, struct btrfs_inode_ref, name_len, 16);
1582 BTRFS_SETGET_STACK_FUNCS(stack_inode_ref_name_len, struct btrfs_inode_ref, name_len, 16);
1583 BTRFS_SETGET_FUNCS(inode_ref_index, struct btrfs_inode_ref, index, 64);
1584
1585 /* struct btrfs_inode_extref */
1586 BTRFS_SETGET_FUNCS(inode_extref_parent, struct btrfs_inode_extref,
1587                    parent_objectid, 64);
1588 BTRFS_SETGET_FUNCS(inode_extref_name_len, struct btrfs_inode_extref,
1589                    name_len, 16);
1590 BTRFS_SETGET_FUNCS(inode_extref_index, struct btrfs_inode_extref, index, 64);
1591
1592 /* struct btrfs_inode_item */
1593 BTRFS_SETGET_FUNCS(inode_generation, struct btrfs_inode_item, generation, 64);
1594 BTRFS_SETGET_FUNCS(inode_sequence, struct btrfs_inode_item, sequence, 64);
1595 BTRFS_SETGET_FUNCS(inode_transid, struct btrfs_inode_item, transid, 64);
1596 BTRFS_SETGET_FUNCS(inode_size, struct btrfs_inode_item, size, 64);
1597 BTRFS_SETGET_FUNCS(inode_nbytes, struct btrfs_inode_item, nbytes, 64);
1598 BTRFS_SETGET_FUNCS(inode_block_group, struct btrfs_inode_item, block_group, 64);
1599 BTRFS_SETGET_FUNCS(inode_nlink, struct btrfs_inode_item, nlink, 32);
1600 BTRFS_SETGET_FUNCS(inode_uid, struct btrfs_inode_item, uid, 32);
1601 BTRFS_SETGET_FUNCS(inode_gid, struct btrfs_inode_item, gid, 32);
1602 BTRFS_SETGET_FUNCS(inode_mode, struct btrfs_inode_item, mode, 32);
1603 BTRFS_SETGET_FUNCS(inode_rdev, struct btrfs_inode_item, rdev, 64);
1604 BTRFS_SETGET_FUNCS(inode_flags, struct btrfs_inode_item, flags, 64);
1605
1606 BTRFS_SETGET_STACK_FUNCS(stack_inode_generation,
1607                          struct btrfs_inode_item, generation, 64);
1608 BTRFS_SETGET_STACK_FUNCS(stack_inode_sequence,
1609                          struct btrfs_inode_item, sequence, 64);
1610 BTRFS_SETGET_STACK_FUNCS(stack_inode_transid,
1611                          struct btrfs_inode_item, transid, 64);
1612 BTRFS_SETGET_STACK_FUNCS(stack_inode_size,
1613                          struct btrfs_inode_item, size, 64);
1614 BTRFS_SETGET_STACK_FUNCS(stack_inode_nbytes,
1615                          struct btrfs_inode_item, nbytes, 64);
1616 BTRFS_SETGET_STACK_FUNCS(stack_inode_block_group,
1617                          struct btrfs_inode_item, block_group, 64);
1618 BTRFS_SETGET_STACK_FUNCS(stack_inode_nlink,
1619                          struct btrfs_inode_item, nlink, 32);
1620 BTRFS_SETGET_STACK_FUNCS(stack_inode_uid,
1621                          struct btrfs_inode_item, uid, 32);
1622 BTRFS_SETGET_STACK_FUNCS(stack_inode_gid,
1623                          struct btrfs_inode_item, gid, 32);
1624 BTRFS_SETGET_STACK_FUNCS(stack_inode_mode,
1625                          struct btrfs_inode_item, mode, 32);
1626 BTRFS_SETGET_STACK_FUNCS(stack_inode_rdev,
1627                          struct btrfs_inode_item, rdev, 64);
1628 BTRFS_SETGET_STACK_FUNCS(stack_inode_flags,
1629                          struct btrfs_inode_item, flags, 64);
1630
1631 static inline struct btrfs_timespec *
1632 btrfs_inode_atime(struct btrfs_inode_item *inode_item)
1633 {
1634         unsigned long ptr = (unsigned long)inode_item;
1635         ptr += offsetof(struct btrfs_inode_item, atime);
1636         return (struct btrfs_timespec *)ptr;
1637 }
1638
1639 static inline struct btrfs_timespec *
1640 btrfs_inode_mtime(struct btrfs_inode_item *inode_item)
1641 {
1642         unsigned long ptr = (unsigned long)inode_item;
1643         ptr += offsetof(struct btrfs_inode_item, mtime);
1644         return (struct btrfs_timespec *)ptr;
1645 }
1646
1647 static inline struct btrfs_timespec *
1648 btrfs_inode_ctime(struct btrfs_inode_item *inode_item)
1649 {
1650         unsigned long ptr = (unsigned long)inode_item;
1651         ptr += offsetof(struct btrfs_inode_item, ctime);
1652         return (struct btrfs_timespec *)ptr;
1653 }
1654
1655 static inline struct btrfs_timespec *
1656 btrfs_inode_otime(struct btrfs_inode_item *inode_item)
1657 {
1658         unsigned long ptr = (unsigned long)inode_item;
1659         ptr += offsetof(struct btrfs_inode_item, otime);
1660         return (struct btrfs_timespec *)ptr;
1661 }
1662
1663 BTRFS_SETGET_FUNCS(timespec_sec, struct btrfs_timespec, sec, 64);
1664 BTRFS_SETGET_FUNCS(timespec_nsec, struct btrfs_timespec, nsec, 32);
1665 BTRFS_SETGET_STACK_FUNCS(stack_timespec_sec, struct btrfs_timespec,
1666                          sec, 64);
1667 BTRFS_SETGET_STACK_FUNCS(stack_timespec_nsec, struct btrfs_timespec,
1668                          nsec, 32);
1669
1670 /* struct btrfs_dev_extent */
1671 BTRFS_SETGET_FUNCS(dev_extent_chunk_tree, struct btrfs_dev_extent,
1672                    chunk_tree, 64);
1673 BTRFS_SETGET_FUNCS(dev_extent_chunk_objectid, struct btrfs_dev_extent,
1674                    chunk_objectid, 64);
1675 BTRFS_SETGET_FUNCS(dev_extent_chunk_offset, struct btrfs_dev_extent,
1676                    chunk_offset, 64);
1677 BTRFS_SETGET_FUNCS(dev_extent_length, struct btrfs_dev_extent, length, 64);
1678
1679 BTRFS_SETGET_STACK_FUNCS(stack_dev_extent_length, struct btrfs_dev_extent,
1680                          length, 64);
1681
1682 static inline u8 *btrfs_dev_extent_chunk_tree_uuid(struct btrfs_dev_extent *dev)
1683 {
1684         unsigned long ptr = offsetof(struct btrfs_dev_extent, chunk_tree_uuid);
1685         return (u8 *)((unsigned long)dev + ptr);
1686 }
1687
1688
1689 /* struct btrfs_extent_item */
1690 BTRFS_SETGET_FUNCS(extent_refs, struct btrfs_extent_item, refs, 64);
1691 BTRFS_SETGET_STACK_FUNCS(stack_extent_refs, struct btrfs_extent_item, refs, 64);
1692 BTRFS_SETGET_FUNCS(extent_generation, struct btrfs_extent_item,
1693                    generation, 64);
1694 BTRFS_SETGET_FUNCS(extent_flags, struct btrfs_extent_item, flags, 64);
1695 BTRFS_SETGET_STACK_FUNCS(stack_extent_flags, struct btrfs_extent_item, flags, 64);
1696
1697 BTRFS_SETGET_FUNCS(extent_refs_v0, struct btrfs_extent_item_v0, refs, 32);
1698
1699 BTRFS_SETGET_FUNCS(tree_block_level, struct btrfs_tree_block_info, level, 8);
1700
1701 static inline void btrfs_tree_block_key(struct extent_buffer *eb,
1702                                         struct btrfs_tree_block_info *item,
1703                                         struct btrfs_disk_key *key)
1704 {
1705         read_eb_member(eb, item, struct btrfs_tree_block_info, key, key);
1706 }
1707
1708 static inline void btrfs_set_tree_block_key(struct extent_buffer *eb,
1709                                             struct btrfs_tree_block_info *item,
1710                                             struct btrfs_disk_key *key)
1711 {
1712         write_eb_member(eb, item, struct btrfs_tree_block_info, key, key);
1713 }
1714
1715 BTRFS_SETGET_FUNCS(extent_data_ref_root, struct btrfs_extent_data_ref,
1716                    root, 64);
1717 BTRFS_SETGET_FUNCS(extent_data_ref_objectid, struct btrfs_extent_data_ref,
1718                    objectid, 64);
1719 BTRFS_SETGET_FUNCS(extent_data_ref_offset, struct btrfs_extent_data_ref,
1720                    offset, 64);
1721 BTRFS_SETGET_FUNCS(extent_data_ref_count, struct btrfs_extent_data_ref,
1722                    count, 32);
1723
1724 BTRFS_SETGET_FUNCS(shared_data_ref_count, struct btrfs_shared_data_ref,
1725                    count, 32);
1726
1727 BTRFS_SETGET_FUNCS(extent_inline_ref_type, struct btrfs_extent_inline_ref,
1728                    type, 8);
1729 BTRFS_SETGET_FUNCS(extent_inline_ref_offset, struct btrfs_extent_inline_ref,
1730                    offset, 64);
1731 BTRFS_SETGET_STACK_FUNCS(stack_extent_inline_ref_type,
1732                          struct btrfs_extent_inline_ref, type, 8);
1733 BTRFS_SETGET_STACK_FUNCS(stack_extent_inline_ref_offset,
1734                          struct btrfs_extent_inline_ref, offset, 64);
1735
1736 static inline u32 btrfs_extent_inline_ref_size(int type)
1737 {
1738         if (type == BTRFS_TREE_BLOCK_REF_KEY ||
1739             type == BTRFS_SHARED_BLOCK_REF_KEY)
1740                 return sizeof(struct btrfs_extent_inline_ref);
1741         if (type == BTRFS_SHARED_DATA_REF_KEY)
1742                 return sizeof(struct btrfs_shared_data_ref) +
1743                        sizeof(struct btrfs_extent_inline_ref);
1744         if (type == BTRFS_EXTENT_DATA_REF_KEY)
1745                 return sizeof(struct btrfs_extent_data_ref) +
1746                        offsetof(struct btrfs_extent_inline_ref, offset);
1747         BUG();
1748         return 0;
1749 }
1750
1751 BTRFS_SETGET_FUNCS(ref_root_v0, struct btrfs_extent_ref_v0, root, 64);
1752 BTRFS_SETGET_FUNCS(ref_generation_v0, struct btrfs_extent_ref_v0,
1753                    generation, 64);
1754 BTRFS_SETGET_FUNCS(ref_objectid_v0, struct btrfs_extent_ref_v0, objectid, 64);
1755 BTRFS_SETGET_FUNCS(ref_count_v0, struct btrfs_extent_ref_v0, count, 32);
1756
1757 /* struct btrfs_node */
1758 BTRFS_SETGET_FUNCS(key_blockptr, struct btrfs_key_ptr, blockptr, 64);
1759 BTRFS_SETGET_FUNCS(key_generation, struct btrfs_key_ptr, generation, 64);
1760
1761 static inline u64 btrfs_node_blockptr(struct extent_buffer *eb, int nr)
1762 {
1763         unsigned long ptr;
1764         ptr = offsetof(struct btrfs_node, ptrs) +
1765                 sizeof(struct btrfs_key_ptr) * nr;
1766         return btrfs_key_blockptr(eb, (struct btrfs_key_ptr *)ptr);
1767 }
1768
1769 static inline void btrfs_set_node_blockptr(struct extent_buffer *eb,
1770                                            int nr, u64 val)
1771 {
1772         unsigned long ptr;
1773         ptr = offsetof(struct btrfs_node, ptrs) +
1774                 sizeof(struct btrfs_key_ptr) * nr;
1775         btrfs_set_key_blockptr(eb, (struct btrfs_key_ptr *)ptr, val);
1776 }
1777
1778 static inline u64 btrfs_node_ptr_generation(struct extent_buffer *eb, int nr)
1779 {
1780         unsigned long ptr;
1781         ptr = offsetof(struct btrfs_node, ptrs) +
1782                 sizeof(struct btrfs_key_ptr) * nr;
1783         return btrfs_key_generation(eb, (struct btrfs_key_ptr *)ptr);
1784 }
1785
1786 static inline void btrfs_set_node_ptr_generation(struct extent_buffer *eb,
1787                                                  int nr, u64 val)
1788 {
1789         unsigned long ptr;
1790         ptr = offsetof(struct btrfs_node, ptrs) +
1791                 sizeof(struct btrfs_key_ptr) * nr;
1792         btrfs_set_key_generation(eb, (struct btrfs_key_ptr *)ptr, val);
1793 }
1794
1795 static inline unsigned long btrfs_node_key_ptr_offset(int nr)
1796 {
1797         return offsetof(struct btrfs_node, ptrs) +
1798                 sizeof(struct btrfs_key_ptr) * nr;
1799 }
1800
1801 static inline void btrfs_node_key(struct extent_buffer *eb,
1802                                   struct btrfs_disk_key *disk_key, int nr)
1803 {
1804         unsigned long ptr;
1805         ptr = btrfs_node_key_ptr_offset(nr);
1806         read_eb_member(eb, (struct btrfs_key_ptr *)ptr,
1807                        struct btrfs_key_ptr, key, disk_key);
1808 }
1809
1810 static inline void btrfs_set_node_key(struct extent_buffer *eb,
1811                                       struct btrfs_disk_key *disk_key, int nr)
1812 {
1813         unsigned long ptr;
1814         ptr = btrfs_node_key_ptr_offset(nr);
1815         write_eb_member(eb, (struct btrfs_key_ptr *)ptr,
1816                        struct btrfs_key_ptr, key, disk_key);
1817 }
1818
1819 /* struct btrfs_item */
1820 BTRFS_SETGET_FUNCS(item_offset, struct btrfs_item, offset, 32);
1821 BTRFS_SETGET_FUNCS(item_size, struct btrfs_item, size, 32);
1822
1823 static inline unsigned long btrfs_item_nr_offset(int nr)
1824 {
1825         return offsetof(struct btrfs_leaf, items) +
1826                 sizeof(struct btrfs_item) * nr;
1827 }
1828
1829 static inline struct btrfs_item *btrfs_item_nr(int nr)
1830 {
1831         return (struct btrfs_item *)btrfs_item_nr_offset(nr);
1832 }
1833
1834 static inline u32 btrfs_item_end(struct extent_buffer *eb,
1835                                  struct btrfs_item *item)
1836 {
1837         return btrfs_item_offset(eb, item) + btrfs_item_size(eb, item);
1838 }
1839
1840 static inline u32 btrfs_item_end_nr(struct extent_buffer *eb, int nr)
1841 {
1842         return btrfs_item_end(eb, btrfs_item_nr(nr));
1843 }
1844
1845 static inline u32 btrfs_item_offset_nr(struct extent_buffer *eb, int nr)
1846 {
1847         return btrfs_item_offset(eb, btrfs_item_nr(nr));
1848 }
1849
1850 static inline u32 btrfs_item_size_nr(struct extent_buffer *eb, int nr)
1851 {
1852         return btrfs_item_size(eb, btrfs_item_nr(nr));
1853 }
1854
1855 static inline void btrfs_item_key(struct extent_buffer *eb,
1856                            struct btrfs_disk_key *disk_key, int nr)
1857 {
1858         struct btrfs_item *item = btrfs_item_nr(nr);
1859         read_eb_member(eb, item, struct btrfs_item, key, disk_key);
1860 }
1861
1862 static inline void btrfs_set_item_key(struct extent_buffer *eb,
1863                                struct btrfs_disk_key *disk_key, int nr)
1864 {
1865         struct btrfs_item *item = btrfs_item_nr(nr);
1866         write_eb_member(eb, item, struct btrfs_item, key, disk_key);
1867 }
1868
1869 BTRFS_SETGET_FUNCS(dir_log_end, struct btrfs_dir_log_item, end, 64);
1870
1871 /*
1872  * struct btrfs_root_ref
1873  */
1874 BTRFS_SETGET_FUNCS(root_ref_dirid, struct btrfs_root_ref, dirid, 64);
1875 BTRFS_SETGET_FUNCS(root_ref_sequence, struct btrfs_root_ref, sequence, 64);
1876 BTRFS_SETGET_FUNCS(root_ref_name_len, struct btrfs_root_ref, name_len, 16);
1877
1878 BTRFS_SETGET_STACK_FUNCS(stack_root_ref_dirid, struct btrfs_root_ref, dirid, 64);
1879 BTRFS_SETGET_STACK_FUNCS(stack_root_ref_sequence, struct btrfs_root_ref, sequence, 64);
1880 BTRFS_SETGET_STACK_FUNCS(stack_root_ref_name_len, struct btrfs_root_ref, name_len, 16);
1881
1882 /* struct btrfs_dir_item */
1883 BTRFS_SETGET_FUNCS(dir_data_len, struct btrfs_dir_item, data_len, 16);
1884 BTRFS_SETGET_FUNCS(dir_type, struct btrfs_dir_item, type, 8);
1885 BTRFS_SETGET_FUNCS(dir_name_len, struct btrfs_dir_item, name_len, 16);
1886 BTRFS_SETGET_FUNCS(dir_transid, struct btrfs_dir_item, transid, 64);
1887
1888 BTRFS_SETGET_STACK_FUNCS(stack_dir_data_len, struct btrfs_dir_item, data_len, 16);
1889 BTRFS_SETGET_STACK_FUNCS(stack_dir_type, struct btrfs_dir_item, type, 8);
1890 BTRFS_SETGET_STACK_FUNCS(stack_dir_name_len, struct btrfs_dir_item, name_len, 16);
1891 BTRFS_SETGET_STACK_FUNCS(stack_dir_transid, struct btrfs_dir_item, transid, 64);
1892
1893 static inline void btrfs_dir_item_key(struct extent_buffer *eb,
1894                                       struct btrfs_dir_item *item,
1895                                       struct btrfs_disk_key *key)
1896 {
1897         read_eb_member(eb, item, struct btrfs_dir_item, location, key);
1898 }
1899
1900 static inline void btrfs_set_dir_item_key(struct extent_buffer *eb,
1901                                           struct btrfs_dir_item *item,
1902                                           struct btrfs_disk_key *key)
1903 {
1904         write_eb_member(eb, item, struct btrfs_dir_item, location, key);
1905 }
1906
1907 /* struct btrfs_free_space_header */
1908 BTRFS_SETGET_FUNCS(free_space_entries, struct btrfs_free_space_header,
1909                    num_entries, 64);
1910 BTRFS_SETGET_FUNCS(free_space_bitmaps, struct btrfs_free_space_header,
1911                    num_bitmaps, 64);
1912 BTRFS_SETGET_FUNCS(free_space_generation, struct btrfs_free_space_header,
1913                    generation, 64);
1914
1915 static inline void btrfs_free_space_key(struct extent_buffer *eb,
1916                                         struct btrfs_free_space_header *h,
1917                                         struct btrfs_disk_key *key)
1918 {
1919         read_eb_member(eb, h, struct btrfs_free_space_header, location, key);
1920 }
1921
1922 static inline void btrfs_set_free_space_key(struct extent_buffer *eb,
1923                                             struct btrfs_free_space_header *h,
1924                                             struct btrfs_disk_key *key)
1925 {
1926         write_eb_member(eb, h, struct btrfs_free_space_header, location, key);
1927 }
1928
1929 /* struct btrfs_disk_key */
1930 BTRFS_SETGET_STACK_FUNCS(disk_key_objectid, struct btrfs_disk_key,
1931                          objectid, 64);
1932 BTRFS_SETGET_STACK_FUNCS(disk_key_offset, struct btrfs_disk_key, offset, 64);
1933 BTRFS_SETGET_STACK_FUNCS(disk_key_type, struct btrfs_disk_key, type, 8);
1934
1935 static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu,
1936                                          struct btrfs_disk_key *disk)
1937 {
1938         cpu->offset = le64_to_cpu(disk->offset);
1939         cpu->type = disk->type;
1940         cpu->objectid = le64_to_cpu(disk->objectid);
1941 }
1942
1943 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk,
1944                                          struct btrfs_key *cpu)
1945 {
1946         disk->offset = cpu_to_le64(cpu->offset);
1947         disk->type = cpu->type;
1948         disk->objectid = cpu_to_le64(cpu->objectid);
1949 }
1950
1951 static inline void btrfs_node_key_to_cpu(struct extent_buffer *eb,
1952                                   struct btrfs_key *key, int nr)
1953 {
1954         struct btrfs_disk_key disk_key;
1955         btrfs_node_key(eb, &disk_key, nr);
1956         btrfs_disk_key_to_cpu(key, &disk_key);
1957 }
1958
1959 static inline void btrfs_item_key_to_cpu(struct extent_buffer *eb,
1960                                   struct btrfs_key *key, int nr)
1961 {
1962         struct btrfs_disk_key disk_key;
1963         btrfs_item_key(eb, &disk_key, nr);
1964         btrfs_disk_key_to_cpu(key, &disk_key);
1965 }
1966
1967 static inline void btrfs_dir_item_key_to_cpu(struct extent_buffer *eb,
1968                                       struct btrfs_dir_item *item,
1969                                       struct btrfs_key *key)
1970 {
1971         struct btrfs_disk_key disk_key;
1972         btrfs_dir_item_key(eb, item, &disk_key);
1973         btrfs_disk_key_to_cpu(key, &disk_key);
1974 }
1975
1976 /* struct btrfs_header */
1977 BTRFS_SETGET_HEADER_FUNCS(header_bytenr, struct btrfs_header, bytenr, 64);
1978 BTRFS_SETGET_HEADER_FUNCS(header_generation, struct btrfs_header,
1979                           generation, 64);
1980 BTRFS_SETGET_HEADER_FUNCS(header_owner, struct btrfs_header, owner, 64);
1981 BTRFS_SETGET_HEADER_FUNCS(header_nritems, struct btrfs_header, nritems, 32);
1982 BTRFS_SETGET_HEADER_FUNCS(header_flags, struct btrfs_header, flags, 64);
1983 BTRFS_SETGET_HEADER_FUNCS(header_level, struct btrfs_header, level, 8);
1984 BTRFS_SETGET_STACK_FUNCS(stack_header_bytenr, struct btrfs_header, bytenr, 64);
1985 BTRFS_SETGET_STACK_FUNCS(stack_header_nritems, struct btrfs_header, nritems,
1986                          32);
1987 BTRFS_SETGET_STACK_FUNCS(stack_header_owner, struct btrfs_header, owner, 64);
1988 BTRFS_SETGET_STACK_FUNCS(stack_header_generation, struct btrfs_header,
1989                          generation, 64);
1990
1991 static inline int btrfs_header_flag(struct extent_buffer *eb, u64 flag)
1992 {
1993         return (btrfs_header_flags(eb) & flag) == flag;
1994 }
1995
1996 static inline int btrfs_set_header_flag(struct extent_buffer *eb, u64 flag)
1997 {
1998         u64 flags = btrfs_header_flags(eb);
1999         btrfs_set_header_flags(eb, flags | flag);
2000         return (flags & flag) == flag;
2001 }
2002
2003 static inline int btrfs_clear_header_flag(struct extent_buffer *eb, u64 flag)
2004 {
2005         u64 flags = btrfs_header_flags(eb);
2006         btrfs_set_header_flags(eb, flags & ~flag);
2007         return (flags & flag) == flag;
2008 }
2009
2010 static inline int btrfs_header_backref_rev(struct extent_buffer *eb)
2011 {
2012         u64 flags = btrfs_header_flags(eb);
2013         return flags >> BTRFS_BACKREF_REV_SHIFT;
2014 }
2015
2016 static inline void btrfs_set_header_backref_rev(struct extent_buffer *eb,
2017                                                 int rev)
2018 {
2019         u64 flags = btrfs_header_flags(eb);
2020         flags &= ~BTRFS_BACKREF_REV_MASK;
2021         flags |= (u64)rev << BTRFS_BACKREF_REV_SHIFT;
2022         btrfs_set_header_flags(eb, flags);
2023 }
2024
2025 static inline unsigned long btrfs_header_fsid(void)
2026 {
2027         return offsetof(struct btrfs_header, fsid);
2028 }
2029
2030 static inline unsigned long btrfs_header_chunk_tree_uuid(struct extent_buffer *eb)
2031 {
2032         return offsetof(struct btrfs_header, chunk_tree_uuid);
2033 }
2034
2035 static inline u8 *btrfs_header_csum(struct extent_buffer *eb)
2036 {
2037         unsigned long ptr = offsetof(struct btrfs_header, csum);
2038         return (u8 *)ptr;
2039 }
2040
2041 static inline int btrfs_is_leaf(struct extent_buffer *eb)
2042 {
2043         return (btrfs_header_level(eb) == 0);
2044 }
2045
2046 /* struct btrfs_root_item */
2047 BTRFS_SETGET_FUNCS(disk_root_generation, struct btrfs_root_item,
2048                    generation, 64);
2049 BTRFS_SETGET_FUNCS(disk_root_refs, struct btrfs_root_item, refs, 32);
2050 BTRFS_SETGET_FUNCS(disk_root_bytenr, struct btrfs_root_item, bytenr, 64);
2051 BTRFS_SETGET_FUNCS(disk_root_level, struct btrfs_root_item, level, 8);
2052
2053 BTRFS_SETGET_STACK_FUNCS(root_generation, struct btrfs_root_item,
2054                          generation, 64);
2055 BTRFS_SETGET_STACK_FUNCS(root_bytenr, struct btrfs_root_item, bytenr, 64);
2056 BTRFS_SETGET_STACK_FUNCS(root_level, struct btrfs_root_item, level, 8);
2057 BTRFS_SETGET_STACK_FUNCS(root_dirid, struct btrfs_root_item, root_dirid, 64);
2058 BTRFS_SETGET_STACK_FUNCS(root_refs, struct btrfs_root_item, refs, 32);
2059 BTRFS_SETGET_STACK_FUNCS(root_flags, struct btrfs_root_item, flags, 64);
2060 BTRFS_SETGET_STACK_FUNCS(root_used, struct btrfs_root_item, bytes_used, 64);
2061 BTRFS_SETGET_STACK_FUNCS(root_limit, struct btrfs_root_item, byte_limit, 64);
2062 BTRFS_SETGET_STACK_FUNCS(root_last_snapshot, struct btrfs_root_item,
2063                          last_snapshot, 64);
2064 BTRFS_SETGET_STACK_FUNCS(root_generation_v2, struct btrfs_root_item,
2065                          generation_v2, 64);
2066 BTRFS_SETGET_STACK_FUNCS(root_ctransid, struct btrfs_root_item,
2067                          ctransid, 64);
2068 BTRFS_SETGET_STACK_FUNCS(root_otransid, struct btrfs_root_item,
2069                          otransid, 64);
2070 BTRFS_SETGET_STACK_FUNCS(root_stransid, struct btrfs_root_item,
2071                          stransid, 64);
2072 BTRFS_SETGET_STACK_FUNCS(root_rtransid, struct btrfs_root_item,
2073                          rtransid, 64);
2074
2075 static inline struct btrfs_timespec* btrfs_root_ctime(
2076                 struct btrfs_root_item *root_item)
2077 {
2078         unsigned long ptr = (unsigned long)root_item;
2079         ptr += offsetof(struct btrfs_root_item, ctime);
2080         return (struct btrfs_timespec *)ptr;
2081 }
2082
2083 static inline struct btrfs_timespec* btrfs_root_otime(
2084                 struct btrfs_root_item *root_item)
2085 {
2086         unsigned long ptr = (unsigned long)root_item;
2087         ptr += offsetof(struct btrfs_root_item, otime);
2088         return (struct btrfs_timespec *)ptr;
2089 }
2090
2091 static inline struct btrfs_timespec* btrfs_root_stime(
2092                 struct btrfs_root_item *root_item)
2093 {
2094         unsigned long ptr = (unsigned long)root_item;
2095         ptr += offsetof(struct btrfs_root_item, stime);
2096         return (struct btrfs_timespec *)ptr;
2097 }
2098
2099 static inline struct btrfs_timespec* btrfs_root_rtime(
2100                 struct btrfs_root_item *root_item)
2101 {
2102         unsigned long ptr = (unsigned long)root_item;
2103         ptr += offsetof(struct btrfs_root_item, rtime);
2104         return (struct btrfs_timespec *)ptr;
2105 }
2106
2107 /* struct btrfs_root_backup */
2108 BTRFS_SETGET_STACK_FUNCS(backup_tree_root, struct btrfs_root_backup,
2109                    tree_root, 64);
2110 BTRFS_SETGET_STACK_FUNCS(backup_tree_root_gen, struct btrfs_root_backup,
2111                    tree_root_gen, 64);
2112 BTRFS_SETGET_STACK_FUNCS(backup_tree_root_level, struct btrfs_root_backup,
2113                    tree_root_level, 8);
2114
2115 BTRFS_SETGET_STACK_FUNCS(backup_chunk_root, struct btrfs_root_backup,
2116                    chunk_root, 64);
2117 BTRFS_SETGET_STACK_FUNCS(backup_chunk_root_gen, struct btrfs_root_backup,
2118                    chunk_root_gen, 64);
2119 BTRFS_SETGET_STACK_FUNCS(backup_chunk_root_level, struct btrfs_root_backup,
2120                    chunk_root_level, 8);
2121
2122 BTRFS_SETGET_STACK_FUNCS(backup_extent_root, struct btrfs_root_backup,
2123                    extent_root, 64);
2124 BTRFS_SETGET_STACK_FUNCS(backup_extent_root_gen, struct btrfs_root_backup,
2125                    extent_root_gen, 64);
2126 BTRFS_SETGET_STACK_FUNCS(backup_extent_root_level, struct btrfs_root_backup,
2127                    extent_root_level, 8);
2128
2129 BTRFS_SETGET_STACK_FUNCS(backup_fs_root, struct btrfs_root_backup,
2130                    fs_root, 64);
2131 BTRFS_SETGET_STACK_FUNCS(backup_fs_root_gen, struct btrfs_root_backup,
2132                    fs_root_gen, 64);
2133 BTRFS_SETGET_STACK_FUNCS(backup_fs_root_level, struct btrfs_root_backup,
2134                    fs_root_level, 8);
2135
2136 BTRFS_SETGET_STACK_FUNCS(backup_dev_root, struct btrfs_root_backup,
2137                    dev_root, 64);
2138 BTRFS_SETGET_STACK_FUNCS(backup_dev_root_gen, struct btrfs_root_backup,
2139                    dev_root_gen, 64);
2140 BTRFS_SETGET_STACK_FUNCS(backup_dev_root_level, struct btrfs_root_backup,
2141                    dev_root_level, 8);
2142
2143 BTRFS_SETGET_STACK_FUNCS(backup_csum_root, struct btrfs_root_backup,
2144                    csum_root, 64);
2145 BTRFS_SETGET_STACK_FUNCS(backup_csum_root_gen, struct btrfs_root_backup,
2146                    csum_root_gen, 64);
2147 BTRFS_SETGET_STACK_FUNCS(backup_csum_root_level, struct btrfs_root_backup,
2148                    csum_root_level, 8);
2149 BTRFS_SETGET_STACK_FUNCS(backup_total_bytes, struct btrfs_root_backup,
2150                    total_bytes, 64);
2151 BTRFS_SETGET_STACK_FUNCS(backup_bytes_used, struct btrfs_root_backup,
2152                    bytes_used, 64);
2153 BTRFS_SETGET_STACK_FUNCS(backup_num_devices, struct btrfs_root_backup,
2154                    num_devices, 64);
2155
2156 /* struct btrfs_super_block */
2157
2158 BTRFS_SETGET_STACK_FUNCS(super_bytenr, struct btrfs_super_block, bytenr, 64);
2159 BTRFS_SETGET_STACK_FUNCS(super_flags, struct btrfs_super_block, flags, 64);
2160 BTRFS_SETGET_STACK_FUNCS(super_generation, struct btrfs_super_block,
2161                          generation, 64);
2162 BTRFS_SETGET_STACK_FUNCS(super_root, struct btrfs_super_block, root, 64);
2163 BTRFS_SETGET_STACK_FUNCS(super_sys_array_size,
2164                          struct btrfs_super_block, sys_chunk_array_size, 32);
2165 BTRFS_SETGET_STACK_FUNCS(super_chunk_root_generation,
2166                          struct btrfs_super_block, chunk_root_generation, 64);
2167 BTRFS_SETGET_STACK_FUNCS(super_root_level, struct btrfs_super_block,
2168                          root_level, 8);
2169 BTRFS_SETGET_STACK_FUNCS(super_chunk_root, struct btrfs_super_block,
2170                          chunk_root, 64);
2171 BTRFS_SETGET_STACK_FUNCS(super_chunk_root_level, struct btrfs_super_block,
2172                          chunk_root_level, 8);
2173 BTRFS_SETGET_STACK_FUNCS(super_log_root, struct btrfs_super_block,
2174                          log_root, 64);
2175 BTRFS_SETGET_STACK_FUNCS(super_log_root_transid, struct btrfs_super_block,
2176                          log_root_transid, 64);
2177 BTRFS_SETGET_STACK_FUNCS(super_log_root_level, struct btrfs_super_block,
2178                          log_root_level, 8);
2179 BTRFS_SETGET_STACK_FUNCS(super_total_bytes, struct btrfs_super_block,
2180                          total_bytes, 64);
2181 BTRFS_SETGET_STACK_FUNCS(super_bytes_used, struct btrfs_super_block,
2182                          bytes_used, 64);
2183 BTRFS_SETGET_STACK_FUNCS(super_sectorsize, struct btrfs_super_block,
2184                          sectorsize, 32);
2185 BTRFS_SETGET_STACK_FUNCS(super_nodesize, struct btrfs_super_block,
2186                          nodesize, 32);
2187 BTRFS_SETGET_STACK_FUNCS(super_stripesize, struct btrfs_super_block,
2188                          stripesize, 32);
2189 BTRFS_SETGET_STACK_FUNCS(super_root_dir, struct btrfs_super_block,
2190                          root_dir_objectid, 64);
2191 BTRFS_SETGET_STACK_FUNCS(super_num_devices, struct btrfs_super_block,
2192                          num_devices, 64);
2193 BTRFS_SETGET_STACK_FUNCS(super_compat_flags, struct btrfs_super_block,
2194                          compat_flags, 64);
2195 BTRFS_SETGET_STACK_FUNCS(super_compat_ro_flags, struct btrfs_super_block,
2196                          compat_ro_flags, 64);
2197 BTRFS_SETGET_STACK_FUNCS(super_incompat_flags, struct btrfs_super_block,
2198                          incompat_flags, 64);
2199 BTRFS_SETGET_STACK_FUNCS(super_csum_type, struct btrfs_super_block,
2200                          csum_type, 16);
2201 BTRFS_SETGET_STACK_FUNCS(super_cache_generation, struct btrfs_super_block,
2202                          cache_generation, 64);
2203 BTRFS_SETGET_STACK_FUNCS(super_uuid_tree_generation, struct btrfs_super_block,
2204                          uuid_tree_generation, 64);
2205 BTRFS_SETGET_STACK_FUNCS(super_magic, struct btrfs_super_block, magic, 64);
2206
2207 static inline int btrfs_super_csum_size(struct btrfs_super_block *s)
2208 {
2209         int t = btrfs_super_csum_type(s);
2210         BUG_ON(t >= ARRAY_SIZE(btrfs_csum_sizes));
2211         return btrfs_csum_sizes[t];
2212 }
2213
2214 static inline unsigned long btrfs_leaf_data(struct extent_buffer *l)
2215 {
2216         return offsetof(struct btrfs_leaf, items);
2217 }
2218
2219 /* struct btrfs_file_extent_item */
2220 BTRFS_SETGET_FUNCS(file_extent_type, struct btrfs_file_extent_item, type, 8);
2221 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_type, struct btrfs_file_extent_item, type, 8);
2222
2223 static inline unsigned long btrfs_file_extent_inline_start(struct
2224                                                    btrfs_file_extent_item *e)
2225 {
2226         unsigned long offset = (unsigned long)e;
2227         offset += offsetof(struct btrfs_file_extent_item, disk_bytenr);
2228         return offset;
2229 }
2230
2231 static inline u32 btrfs_file_extent_calc_inline_size(u32 datasize)
2232 {
2233         return offsetof(struct btrfs_file_extent_item, disk_bytenr) + datasize;
2234 }
2235
2236 BTRFS_SETGET_FUNCS(file_extent_disk_bytenr, struct btrfs_file_extent_item,
2237                    disk_bytenr, 64);
2238 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_disk_bytenr, struct btrfs_file_extent_item,
2239                    disk_bytenr, 64);
2240 BTRFS_SETGET_FUNCS(file_extent_generation, struct btrfs_file_extent_item,
2241                    generation, 64);
2242 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_generation, struct btrfs_file_extent_item,
2243                    generation, 64);
2244 BTRFS_SETGET_FUNCS(file_extent_disk_num_bytes, struct btrfs_file_extent_item,
2245                    disk_num_bytes, 64);
2246 BTRFS_SETGET_FUNCS(file_extent_offset, struct btrfs_file_extent_item,
2247                   offset, 64);
2248 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_offset, struct btrfs_file_extent_item,
2249                   offset, 64);
2250 BTRFS_SETGET_FUNCS(file_extent_num_bytes, struct btrfs_file_extent_item,
2251                    num_bytes, 64);
2252 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_num_bytes, struct btrfs_file_extent_item,
2253                    num_bytes, 64);
2254 BTRFS_SETGET_FUNCS(file_extent_ram_bytes, struct btrfs_file_extent_item,
2255                    ram_bytes, 64);
2256 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_ram_bytes, struct btrfs_file_extent_item,
2257                    ram_bytes, 64);
2258 BTRFS_SETGET_FUNCS(file_extent_compression, struct btrfs_file_extent_item,
2259                    compression, 8);
2260 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_compression, struct btrfs_file_extent_item,
2261                    compression, 8);
2262 BTRFS_SETGET_FUNCS(file_extent_encryption, struct btrfs_file_extent_item,
2263                    encryption, 8);
2264 BTRFS_SETGET_FUNCS(file_extent_other_encoding, struct btrfs_file_extent_item,
2265                    other_encoding, 16);
2266
2267 /* btrfs_qgroup_status_item */
2268 BTRFS_SETGET_FUNCS(qgroup_status_version, struct btrfs_qgroup_status_item,
2269                    version, 64);
2270 BTRFS_SETGET_FUNCS(qgroup_status_generation, struct btrfs_qgroup_status_item,
2271                    generation, 64);
2272 BTRFS_SETGET_FUNCS(qgroup_status_flags, struct btrfs_qgroup_status_item,
2273                    flags, 64);
2274 BTRFS_SETGET_FUNCS(qgroup_status_rescan, struct btrfs_qgroup_status_item,
2275                    rescan, 64);
2276
2277 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_status_version,
2278                          struct btrfs_qgroup_status_item, version, 64);
2279 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_status_generation,
2280                          struct btrfs_qgroup_status_item, generation, 64);
2281 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_status_flags,
2282                          struct btrfs_qgroup_status_item, flags, 64);
2283 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_status_rescan,
2284                          struct btrfs_qgroup_status_item, rescan, 64);
2285
2286 /* btrfs_qgroup_info_item */
2287 BTRFS_SETGET_FUNCS(qgroup_info_generation, struct btrfs_qgroup_info_item,
2288                    generation, 64);
2289 BTRFS_SETGET_FUNCS(qgroup_info_referenced, struct btrfs_qgroup_info_item,
2290                    referenced, 64);
2291 BTRFS_SETGET_FUNCS(qgroup_info_referenced_compressed,
2292                    struct btrfs_qgroup_info_item, referenced_compressed, 64);
2293 BTRFS_SETGET_FUNCS(qgroup_info_exclusive, struct btrfs_qgroup_info_item,
2294                    exclusive, 64);
2295 BTRFS_SETGET_FUNCS(qgroup_info_exclusive_compressed,
2296                    struct btrfs_qgroup_info_item, exclusive_compressed, 64);
2297
2298 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_generation,
2299                          struct btrfs_qgroup_info_item, generation, 64);
2300 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_referenced,
2301                          struct btrfs_qgroup_info_item, referenced, 64);
2302 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_referenced_compressed,
2303                    struct btrfs_qgroup_info_item, referenced_compressed, 64);
2304 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_exclusive,
2305                          struct btrfs_qgroup_info_item, exclusive, 64);
2306 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_exclusive_compressed,
2307                    struct btrfs_qgroup_info_item, exclusive_compressed, 64);
2308
2309 /* btrfs_qgroup_limit_item */
2310 BTRFS_SETGET_FUNCS(qgroup_limit_flags, struct btrfs_qgroup_limit_item,
2311                    flags, 64);
2312 BTRFS_SETGET_FUNCS(qgroup_limit_max_referenced, struct btrfs_qgroup_limit_item,
2313                    max_referenced, 64);
2314 BTRFS_SETGET_FUNCS(qgroup_limit_max_exclusive, struct btrfs_qgroup_limit_item,
2315                    max_exclusive, 64);
2316 BTRFS_SETGET_FUNCS(qgroup_limit_rsv_referenced, struct btrfs_qgroup_limit_item,
2317                    rsv_referenced, 64);
2318 BTRFS_SETGET_FUNCS(qgroup_limit_rsv_exclusive, struct btrfs_qgroup_limit_item,
2319                    rsv_exclusive, 64);
2320
2321 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_limit_flags,
2322                          struct btrfs_qgroup_limit_item, flags, 64);
2323 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_limit_max_referenced,
2324                          struct btrfs_qgroup_limit_item, max_referenced, 64);
2325 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_limit_max_exclusive,
2326                          struct btrfs_qgroup_limit_item, max_exclusive, 64);
2327 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_limit_rsv_referenced,
2328                          struct btrfs_qgroup_limit_item, rsv_referenced, 64);
2329 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_limit_rsv_exclusive,
2330                          struct btrfs_qgroup_limit_item, rsv_exclusive, 64);
2331
2332 /* btrfs_balance_item */
2333 BTRFS_SETGET_FUNCS(balance_item_flags, struct btrfs_balance_item, flags, 64);
2334
2335 static inline struct btrfs_disk_balance_args* btrfs_balance_item_data(
2336                 struct extent_buffer *eb, struct btrfs_balance_item *bi)
2337 {
2338         unsigned long offset = (unsigned long)bi;
2339         struct btrfs_balance_item *p;
2340         p = (struct btrfs_balance_item *)(eb->data + offset);
2341         return &p->data;
2342 }
2343
2344 static inline struct btrfs_disk_balance_args* btrfs_balance_item_meta(
2345                 struct extent_buffer *eb, struct btrfs_balance_item *bi)
2346 {
2347         unsigned long offset = (unsigned long)bi;
2348         struct btrfs_balance_item *p;
2349         p = (struct btrfs_balance_item *)(eb->data + offset);
2350         return &p->meta;
2351 }
2352
2353 static inline struct btrfs_disk_balance_args* btrfs_balance_item_sys(
2354                 struct extent_buffer *eb, struct btrfs_balance_item *bi)
2355 {
2356         unsigned long offset = (unsigned long)bi;
2357         struct btrfs_balance_item *p;
2358         p = (struct btrfs_balance_item *)(eb->data + offset);
2359         return &p->sys;
2360 }
2361
2362 /*
2363  * btrfs_dev_stats_item helper, returns pointer to the raw array, do the
2364  * endiannes conversion, @dsi is offset to eb data
2365  */
2366 static inline __le64* btrfs_dev_stats_values(struct extent_buffer *eb,
2367                 struct btrfs_dev_stats_item *dsi)
2368 {
2369         unsigned long offset = (unsigned long)dsi;
2370         struct btrfs_dev_stats_item *p;
2371         p = (struct btrfs_dev_stats_item *)(eb->data + offset);
2372         return p->values;
2373 }
2374
2375 /*
2376  * this returns the number of bytes used by the item on disk, minus the
2377  * size of any extent headers.  If a file is compressed on disk, this is
2378  * the compressed size
2379  */
2380 static inline u32 btrfs_file_extent_inline_item_len(struct extent_buffer *eb,
2381                                                     struct btrfs_item *e)
2382 {
2383        unsigned long offset;
2384        offset = offsetof(struct btrfs_file_extent_item, disk_bytenr);
2385        return btrfs_item_size(eb, e) - offset;
2386 }
2387
2388 /* struct btrfs_ioctl_search_header */
2389 static inline u64 btrfs_search_header_transid(struct btrfs_ioctl_search_header *sh)
2390 {
2391         return get_unaligned_64(&sh->transid);
2392 }
2393
2394 static inline u64 btrfs_search_header_objectid(struct btrfs_ioctl_search_header *sh)
2395 {
2396         return get_unaligned_64(&sh->objectid);
2397 }
2398
2399 static inline u64 btrfs_search_header_offset(struct btrfs_ioctl_search_header *sh)
2400 {
2401         return get_unaligned_64(&sh->offset);
2402 }
2403
2404 static inline u32 btrfs_search_header_type(struct btrfs_ioctl_search_header *sh)
2405 {
2406         return get_unaligned_32(&sh->type);
2407 }
2408
2409 static inline u32 btrfs_search_header_len(struct btrfs_ioctl_search_header *sh)
2410 {
2411         return get_unaligned_32(&sh->len);
2412 }
2413
2414 /* this returns the number of file bytes represented by the inline item.
2415  * If an item is compressed, this is the uncompressed size
2416  */
2417 static inline u32 btrfs_file_extent_inline_len(struct extent_buffer *eb,
2418                                                int slot,
2419                                                struct btrfs_file_extent_item *fi)
2420 {
2421         /*
2422          * return the space used on disk if this item isn't
2423          * compressed or encoded
2424          */
2425         if (btrfs_file_extent_compression(eb, fi) == 0 &&
2426             btrfs_file_extent_encryption(eb, fi) == 0 &&
2427             btrfs_file_extent_other_encoding(eb, fi) == 0) {
2428                 return btrfs_file_extent_inline_item_len(eb,
2429                                                          btrfs_item_nr(slot));
2430         }
2431
2432         /* otherwise use the ram bytes field */
2433         return btrfs_file_extent_ram_bytes(eb, fi);
2434 }
2435
2436 #define btrfs_fs_incompat(fs_info, opt) \
2437         __btrfs_fs_incompat((fs_info), BTRFS_FEATURE_INCOMPAT_##opt)
2438
2439 static inline int __btrfs_fs_incompat(struct btrfs_fs_info *fs_info, u64 flag)
2440 {
2441         struct btrfs_super_block *disk_super;
2442         disk_super = fs_info->super_copy;
2443         return !!(btrfs_super_incompat_flags(disk_super) & flag);
2444 }
2445
2446 #define btrfs_fs_compat_ro(fs_info, opt) \
2447         __btrfs_fs_compat_ro((fs_info), BTRFS_FEATURE_COMPAT_RO_##opt)
2448
2449 static inline int __btrfs_fs_compat_ro(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_compat_ro_flags(disk_super) & flag);
2454 }
2455
2456 /* helper function to cast into the data area of the leaf. */
2457 #define btrfs_item_ptr(leaf, slot, type) \
2458         ((type *)(btrfs_leaf_data(leaf) + \
2459         btrfs_item_offset_nr(leaf, slot)))
2460
2461 #define btrfs_item_ptr_offset(leaf, slot) \
2462         ((unsigned long)(btrfs_leaf_data(leaf) + \
2463         btrfs_item_offset_nr(leaf, slot)))
2464
2465 /* extent-tree.c */
2466 int btrfs_reserve_extent(struct btrfs_trans_handle *trans,
2467                          struct btrfs_root *root,
2468                          u64 num_bytes, u64 empty_size,
2469                          u64 hint_byte, u64 search_end,
2470                          struct btrfs_key *ins, int data);
2471 int btrfs_fix_block_accounting(struct btrfs_trans_handle *trans,
2472                                  struct btrfs_root *root);
2473 void btrfs_pin_extent(struct btrfs_fs_info *fs_info, u64 bytenr, u64 num_bytes);
2474 void btrfs_unpin_extent(struct btrfs_fs_info *fs_info,
2475                         u64 bytenr, u64 num_bytes);
2476 int btrfs_extent_post_op(struct btrfs_trans_handle *trans,
2477                          struct btrfs_root *root);
2478 struct btrfs_block_group_cache *btrfs_lookup_block_group(struct
2479                                                          btrfs_fs_info *info,
2480                                                          u64 bytenr);
2481 struct btrfs_block_group_cache *btrfs_lookup_first_block_group(struct
2482                                                        btrfs_fs_info *info,
2483                                                        u64 bytenr);
2484 struct extent_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
2485                                         struct btrfs_root *root,
2486                                         u32 blocksize, u64 root_objectid,
2487                                         struct btrfs_disk_key *key, int level,
2488                                         u64 hint, u64 empty_size);
2489 int btrfs_alloc_extent(struct btrfs_trans_handle *trans,
2490                        struct btrfs_root *root,
2491                        u64 num_bytes, u64 parent,
2492                        u64 root_objectid, u64 ref_generation,
2493                        u64 owner, u64 empty_size, u64 hint_byte,
2494                        u64 search_end, struct btrfs_key *ins, int data);
2495 int btrfs_lookup_extent_info(struct btrfs_trans_handle *trans,
2496                              struct btrfs_root *root, u64 bytenr,
2497                              u64 offset, int metadata, u64 *refs, u64 *flags);
2498 int btrfs_set_block_flags(struct btrfs_trans_handle *trans,
2499                           struct btrfs_root *root,
2500                           u64 bytenr, int level, u64 flags);
2501 int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2502                   struct extent_buffer *buf, int record_parent);
2503 int btrfs_dec_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2504                   struct extent_buffer *buf, int record_parent);
2505 int btrfs_free_tree_block(struct btrfs_trans_handle *trans,
2506                           struct btrfs_root *root,
2507                           struct extent_buffer *buf,
2508                           u64 parent, int last_ref);
2509 int btrfs_free_extent(struct btrfs_trans_handle *trans,
2510                       struct btrfs_root *root,
2511                       u64 bytenr, u64 num_bytes, u64 parent,
2512                       u64 root_objectid, u64 owner, u64 offset);
2513 int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans,
2514                                struct btrfs_root *root,
2515                                struct extent_io_tree *unpin);
2516 int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
2517                                 struct btrfs_root *root,
2518                                 u64 bytenr, u64 num_bytes, u64 parent,
2519                                 u64 root_objectid, u64 ref_generation,
2520                                 u64 owner_objectid);
2521 int btrfs_update_extent_ref(struct btrfs_trans_handle *trans,
2522                             struct btrfs_root *root, u64 bytenr,
2523                             u64 orig_parent, u64 parent,
2524                             u64 root_objectid, u64 ref_generation,
2525                             u64 owner_objectid);
2526 int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans,
2527                                     struct btrfs_root *root);
2528 int btrfs_free_block_groups(struct btrfs_fs_info *info);
2529 int btrfs_read_block_groups(struct btrfs_root *root);
2530 struct btrfs_block_group_cache *
2531 btrfs_add_block_group(struct btrfs_fs_info *fs_info, u64 bytes_used, u64 type,
2532                       u64 chunk_objectid, u64 chunk_offset, u64 size);
2533 int btrfs_make_block_group(struct btrfs_trans_handle *trans,
2534                            struct btrfs_fs_info *fs_info, u64 bytes_used,
2535                            u64 type, u64 chunk_objectid, u64 chunk_offset,
2536                            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 btrfs_root *root, 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