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 #if BTRFS_FLAT_INCLUDES
  23 #include "list.h"
  24 #include "kerncompat.h"
  25 #include "radix-tree.h"
  26 #include "extent-cache.h"
  27 #include "extent_io.h"
  28 #include "ioctl.h"
  29 #include "sizes.h"
  30 #else
  31 #include <btrfs/list.h>
  32 #include <btrfs/kerncompat.h>
  33 #include <btrfs/radix-tree.h>
  34 #include <btrfs/extent-cache.h>
  35 #include <btrfs/extent_io.h>
  36 #include <btrfs/ioctl.h>
  37 #include <btrfs/sizes.h>
  38 #endif /* BTRFS_FLAT_INCLUDES */
  39
  40 struct btrfs_root;
  41 struct btrfs_trans_handle;
  42 struct btrfs_free_space_ctl;
  43 #define BTRFS_MAGIC 0x4D5F53665248425FULL /* ascii _BHRfS_M, no null */
  44
  45 /*
  46  * Fake signature for an unfinalized filesystem, structures might be partially
  47  * created or missing.
  48  */
  49 #define BTRFS_MAGIC_PARTIAL 0x4D5F536652484221ULL /* ascii !BHRfS_M, no null */
  50
  51 #define BTRFS_MAX_MIRRORS 3
  52
  53 #define BTRFS_MAX_LEVEL 8
  54
  55 #define BTRFS_COMPAT_EXTENT_TREE_V0
  56
  57 /* holds pointers to all of the tree roots */
  58 #define BTRFS_ROOT_TREE_OBJECTID 1ULL
  59
  60 /* stores information about which extents are in use, and reference counts */
  61 #define BTRFS_EXTENT_TREE_OBJECTID 2ULL
  62
  63 /*
  64  * chunk tree stores translations from logical -> physical block numbering
  65  * the super block points to the chunk tree
  66  */
  67 #define BTRFS_CHUNK_TREE_OBJECTID 3ULL
  68
  69 /*
  70  * stores information about which areas of a given device are in use.
  71  * one per device.  The tree of tree roots points to the device tree
  72  */
  73 #define BTRFS_DEV_TREE_OBJECTID 4ULL
  74
  75 /* one per subvolume, storing files and directories */
  76 #define BTRFS_FS_TREE_OBJECTID 5ULL
  77
  78 /* directory objectid inside the root tree */
  79 #define BTRFS_ROOT_TREE_DIR_OBJECTID 6ULL
  80 /* holds checksums of all the data extents */
  81 #define BTRFS_CSUM_TREE_OBJECTID 7ULL
  82 #define BTRFS_QUOTA_TREE_OBJECTID 8ULL
  83
  84 /* for storing items that use the BTRFS_UUID_KEY* */
  85 #define BTRFS_UUID_TREE_OBJECTID 9ULL
  86
  87 /* tracks free space in block groups. */
  88 #define BTRFS_FREE_SPACE_TREE_OBJECTID 10ULL
  89
  90 /* device stats in the device tree */
  91 #define BTRFS_DEV_STATS_OBJECTID 0ULL
  92
  93 /* for storing balance parameters in the root tree */
  94 #define BTRFS_BALANCE_OBJECTID -4ULL
  95
  96 /* oprhan objectid for tracking unlinked/truncated files */
  97 #define BTRFS_ORPHAN_OBJECTID -5ULL
  98
  99 /* does write ahead logging to speed up fsyncs */
 100 #define BTRFS_TREE_LOG_OBJECTID -6ULL
 101 #define BTRFS_TREE_LOG_FIXUP_OBJECTID -7ULL
 102
 103 /* space balancing */
 104 #define BTRFS_TREE_RELOC_OBJECTID -8ULL
 105 #define BTRFS_DATA_RELOC_TREE_OBJECTID -9ULL
 106
 107 /*
 108  * extent checksums all have this objectid
 109  * this allows them to share the logging tree
 110  * for fsyncs
 111  */
 112 #define BTRFS_EXTENT_CSUM_OBJECTID -10ULL
 113
 114 /* For storing free space cache */
 115 #define BTRFS_FREE_SPACE_OBJECTID -11ULL
 116
 117 /*
 118  * The inode number assigned to the special inode for sotring
 119  * free ino cache
 120  */
 121 #define BTRFS_FREE_INO_OBJECTID -12ULL
 122
 123 /* dummy objectid represents multiple objectids */
 124 #define BTRFS_MULTIPLE_OBJECTIDS -255ULL
 125
 126 /*
 127  * All files have objectids in this range.
 128  */
 129 #define BTRFS_FIRST_FREE_OBJECTID 256ULL
 130 #define BTRFS_LAST_FREE_OBJECTID -256ULL
 131 #define BTRFS_FIRST_CHUNK_TREE_OBJECTID 256ULL
 132
 133
 134
 135 /*
 136  * the device items go into the chunk tree.  The key is in the form
 137  * [ 1 BTRFS_DEV_ITEM_KEY device_id ]
 138  */
 139 #define BTRFS_DEV_ITEMS_OBJECTID 1ULL
 140
 141 /*
 142  * the max metadata block size.  This limit is somewhat artificial,
 143  * but the memmove costs go through the roof for larger blocks.
 144  */
 145 #define BTRFS_MAX_METADATA_BLOCKSIZE 65536
 146
 147 /*
 148  * we can actually store much bigger names, but lets not confuse the rest
 149  * of linux
 150  */
 151 #define BTRFS_NAME_LEN 255
 152
 153 /*
 154  * Theoretical limit is larger, but we keep this down to a sane
 155  * value. That should limit greatly the possibility of collisions on
 156  * inode ref items.
 157  */
 158 #define BTRFS_LINK_MAX  65535U
 159
 160 /* 32 bytes in various csum fields */
 161 #define BTRFS_CSUM_SIZE 32
 162
 163 /* csum types */
 164 #define BTRFS_CSUM_TYPE_CRC32   0
 165
 166 static int btrfs_csum_sizes[] = { 4 };
 167
 168 /* four bytes for CRC32 */
 169 #define BTRFS_CRC32_SIZE 4
 170 #define BTRFS_EMPTY_DIR_SIZE 0
 171
 172 #define BTRFS_FT_UNKNOWN        0
 173 #define BTRFS_FT_REG_FILE       1
 174 #define BTRFS_FT_DIR            2
 175 #define BTRFS_FT_CHRDEV         3
 176 #define BTRFS_FT_BLKDEV         4
 177 #define BTRFS_FT_FIFO           5
 178 #define BTRFS_FT_SOCK           6
 179 #define BTRFS_FT_SYMLINK        7
 180 #define BTRFS_FT_XATTR          8
 181 #define BTRFS_FT_MAX            9
 182
 183 #define BTRFS_ROOT_SUBVOL_RDONLY        (1ULL << 0)
 184
 185 /*
 186  * the key defines the order in the tree, and so it also defines (optimal)
 187  * block layout.  objectid corresponds to the inode number.  The flags
 188  * tells us things about the object, and is a kind of stream selector.
 189  * so for a given inode, keys with flags of 1 might refer to the inode
 190  * data, flags of 2 may point to file data in the btree and flags == 3
 191  * may point to extents.
 192  *
 193  * offset is the starting byte offset for this key in the stream.
 194  *
 195  * btrfs_disk_key is in disk byte order.  struct btrfs_key is always
 196  * in cpu native order.  Otherwise they are identical and their sizes
 197  * should be the same (ie both packed)
 198  */
 199 struct btrfs_disk_key {
 200         __le64 objectid;
 201         u8 type;
 202         __le64 offset;
 203 } __attribute__ ((__packed__));
 204
 205 struct btrfs_key {
 206         u64 objectid;
 207         u8 type;
 208         u64 offset;
 209 } __attribute__ ((__packed__));
 210
 211 struct btrfs_mapping_tree {
 212         struct cache_tree cache_tree;
 213 };
 214
 215 #define BTRFS_UUID_SIZE 16
 216 struct btrfs_dev_item {
 217         /* the internal btrfs device id */
 218         __le64 devid;
 219
 220         /* size of the device */
 221         __le64 total_bytes;
 222
 223         /* bytes used */
 224         __le64 bytes_used;
 225
 226         /* optimal io alignment for this device */
 227         __le32 io_align;
 228
 229         /* optimal io width for this device */
 230         __le32 io_width;
 231
 232         /* minimal io size for this device */
 233         __le32 sector_size;
 234
 235         /* type and info about this device */
 236         __le64 type;
 237
 238         /* expected generation for this device */
 239         __le64 generation;
 240
 241         /*
 242          * starting byte of this partition on the device,
 243          * to allow for stripe alignment in the future
 244          */
 245         __le64 start_offset;
 246
 247         /* grouping information for allocation decisions */
 248         __le32 dev_group;
 249
 250         /* seek speed 0-100 where 100 is fastest */
 251         u8 seek_speed;
 252
 253         /* bandwidth 0-100 where 100 is fastest */
 254         u8 bandwidth;
 255
 256         /* btrfs generated uuid for this device */
 257         u8 uuid[BTRFS_UUID_SIZE];
 258
 259         /* uuid of FS who owns this device */
 260         u8 fsid[BTRFS_UUID_SIZE];
 261 } __attribute__ ((__packed__));
 262
 263 struct btrfs_stripe {
 264         __le64 devid;
 265         __le64 offset;
 266         u8 dev_uuid[BTRFS_UUID_SIZE];
 267 } __attribute__ ((__packed__));
 268
 269 struct btrfs_chunk {
 270         /* size of this chunk in bytes */
 271         __le64 length;
 272
 273         /* objectid of the root referencing this chunk */
 274         __le64 owner;
 275
 276         __le64 stripe_len;
 277         __le64 type;
 278
 279         /* optimal io alignment for this chunk */
 280         __le32 io_align;
 281
 282         /* optimal io width for this chunk */
 283         __le32 io_width;
 284
 285         /* minimal io size for this chunk */
 286         __le32 sector_size;
 287
 288         /* 2^16 stripes is quite a lot, a second limit is the size of a single
 289          * item in the btree
 290          */
 291         __le16 num_stripes;
 292
 293         /* sub stripes only matter for raid10 */
 294         __le16 sub_stripes;
 295         struct btrfs_stripe stripe;
 296         /* additional stripes go here */
 297 } __attribute__ ((__packed__));
 298
 299 #define BTRFS_FREE_SPACE_EXTENT 1
 300 #define BTRFS_FREE_SPACE_BITMAP 2
 301
 302 struct btrfs_free_space_entry {
 303         __le64 offset;
 304         __le64 bytes;
 305         u8 type;
 306 } __attribute__ ((__packed__));
 307
 308 struct btrfs_free_space_header {
 309         struct btrfs_disk_key location;
 310         __le64 generation;
 311         __le64 num_entries;
 312         __le64 num_bitmaps;
 313 } __attribute__ ((__packed__));
 314
 315 static inline unsigned long btrfs_chunk_item_size(int num_stripes)
 316 {
 317         BUG_ON(num_stripes == 0);
 318         return sizeof(struct btrfs_chunk) +
 319                 sizeof(struct btrfs_stripe) * (num_stripes - 1);
 320 }
 321
 322 #define BTRFS_HEADER_FLAG_WRITTEN               (1ULL << 0)
 323 #define BTRFS_HEADER_FLAG_RELOC                 (1ULL << 1)
 324 #define BTRFS_SUPER_FLAG_SEEDING                (1ULL << 32)
 325 #define BTRFS_SUPER_FLAG_METADUMP               (1ULL << 33)
 326 #define BTRFS_SUPER_FLAG_METADUMP_V2            (1ULL << 34)
 327 #define BTRFS_SUPER_FLAG_CHANGING_FSID          (1ULL << 35)
 328
 329 #define BTRFS_BACKREF_REV_MAX           256
 330 #define BTRFS_BACKREF_REV_SHIFT         56
 331 #define BTRFS_BACKREF_REV_MASK          (((u64)BTRFS_BACKREF_REV_MAX - 1) << \
 332                                          BTRFS_BACKREF_REV_SHIFT)
 333
 334 #define BTRFS_OLD_BACKREF_REV           0
 335 #define BTRFS_MIXED_BACKREF_REV         1
 336
 337 /*
 338  * every tree block (leaf or node) starts with this header.
 339  */
 340 struct btrfs_header {
 341         /* these first four must match the super block */
 342         u8 csum[BTRFS_CSUM_SIZE];
 343         u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
 344         __le64 bytenr; /* which block this node is supposed to live in */
 345         __le64 flags;
 346
 347         /* allowed to be different from the super from here on down */
 348         u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
 349         __le64 generation;
 350         __le64 owner;
 351         __le32 nritems;
 352         u8 level;
 353 } __attribute__ ((__packed__));
 354
 355 #define BTRFS_NODEPTRS_PER_BLOCK(r) (((r)->nodesize - \
 356                                 sizeof(struct btrfs_header)) / \
 357                                 sizeof(struct btrfs_key_ptr))
 358 #define __BTRFS_LEAF_DATA_SIZE(bs) ((bs) - sizeof(struct btrfs_header))
 359 #define BTRFS_LEAF_DATA_SIZE(r) (__BTRFS_LEAF_DATA_SIZE(r->nodesize))
 360 #define BTRFS_MAX_INLINE_DATA_SIZE(r) (BTRFS_LEAF_DATA_SIZE(r) - \
 361                                         sizeof(struct btrfs_item) - \
 362                                         sizeof(struct btrfs_file_extent_item))
 363 #define BTRFS_MAX_XATTR_SIZE(r) (BTRFS_LEAF_DATA_SIZE(r) - \
 364                                  sizeof(struct btrfs_item) -\
 365                                  sizeof(struct btrfs_dir_item))
 366
 367
 368 /*
 369  * this is a very generous portion of the super block, giving us
 370  * room to translate 14 chunks with 3 stripes each.
 371  */
 372 #define BTRFS_SYSTEM_CHUNK_ARRAY_SIZE 2048
 373 #define BTRFS_LABEL_SIZE 256
 374
 375 /*
 376  * just in case we somehow lose the roots and are not able to mount,
 377  * we store an array of the roots from previous transactions
 378  * in the super.
 379  */
 380 #define BTRFS_NUM_BACKUP_ROOTS 4
 381 struct btrfs_root_backup {
 382         __le64 tree_root;
 383         __le64 tree_root_gen;
 384
 385         __le64 chunk_root;
 386         __le64 chunk_root_gen;
 387
 388         __le64 extent_root;
 389         __le64 extent_root_gen;
 390
 391         __le64 fs_root;
 392         __le64 fs_root_gen;
 393
 394         __le64 dev_root;
 395         __le64 dev_root_gen;
 396
 397         __le64 csum_root;
 398         __le64 csum_root_gen;
 399
 400         __le64 total_bytes;
 401         __le64 bytes_used;
 402         __le64 num_devices;
 403         /* future */
 404         __le64 unsed_64[4];
 405
 406         u8 tree_root_level;
 407         u8 chunk_root_level;
 408         u8 extent_root_level;
 409         u8 fs_root_level;
 410         u8 dev_root_level;
 411         u8 csum_root_level;
 412         /* future and to align */
 413         u8 unused_8[10];
 414 } __attribute__ ((__packed__));
 415
 416 /*
 417  * the super block basically lists the main trees of the FS
 418  * it currently lacks any block count etc etc
 419  */
 420 struct btrfs_super_block {
 421         u8 csum[BTRFS_CSUM_SIZE];
 422         /* the first 3 fields must match struct btrfs_header */
 423         u8 fsid[BTRFS_FSID_SIZE];    /* FS specific uuid */
 424         __le64 bytenr; /* this block number */
 425         __le64 flags;
 426
 427         /* allowed to be different from the btrfs_header from here own down */
 428         __le64 magic;
 429         __le64 generation;
 430         __le64 root;
 431         __le64 chunk_root;
 432         __le64 log_root;
 433
 434         /* this will help find the new super based on the log root */
 435         __le64 log_root_transid;
 436         __le64 total_bytes;
 437         __le64 bytes_used;
 438         __le64 root_dir_objectid;
 439         __le64 num_devices;
 440         __le32 sectorsize;
 441         __le32 nodesize;
 442         /* Unused and must be equal to nodesize */
 443         __le32 leafsize;
 444         __le32 stripesize;
 445         __le32 sys_chunk_array_size;
 446         __le64 chunk_root_generation;
 447         __le64 compat_flags;
 448         __le64 compat_ro_flags;
 449         __le64 incompat_flags;
 450         __le16 csum_type;
 451         u8 root_level;
 452         u8 chunk_root_level;
 453         u8 log_root_level;
 454         struct btrfs_dev_item dev_item;
 455
 456         char label[BTRFS_LABEL_SIZE];
 457
 458         __le64 cache_generation;
 459         __le64 uuid_tree_generation;
 460
 461         /* future expansion */
 462         __le64 reserved[30];
 463         u8 sys_chunk_array[BTRFS_SYSTEM_CHUNK_ARRAY_SIZE];
 464         struct btrfs_root_backup super_roots[BTRFS_NUM_BACKUP_ROOTS];
 465 } __attribute__ ((__packed__));
 466
 467 /*
 468  * Compat flags that we support.  If any incompat flags are set other than the
 469  * ones specified below then we will fail to mount
 470  */
 471 #define BTRFS_FEATURE_COMPAT_RO_FREE_SPACE_TREE (1ULL << 0)
 472 /*
 473  * Older kernels on big-endian systems produced broken free space tree bitmaps,
 474  * and btrfs-progs also used to corrupt the free space tree. If this bit is
 475  * clear, then the free space tree cannot be trusted. btrfs-progs can also
 476  * intentionally clear this bit to ask the kernel to rebuild the free space
 477  * tree.
 478  */
 479 #define BTRFS_FEATURE_COMPAT_RO_FREE_SPACE_TREE_VALID   (1ULL << 1)
 480
 481 #define BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF    (1ULL << 0)
 482 #define BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL   (1ULL << 1)
 483 #define BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS     (1ULL << 2)
 484 #define BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO     (1ULL << 3)
 485
 486 /*
 487  * some patches floated around with a second compression method
 488  * lets save that incompat here for when they do get in
 489  * Note we don't actually support it, we're just reserving the
 490  * number
 491  */
 492 #define BTRFS_FEATURE_INCOMPAT_COMPRESS_LZOv2   (1ULL << 4)
 493
 494 /*
 495  * older kernels tried to do bigger metadata blocks, but the
 496  * code was pretty buggy.  Lets not let them try anymore.
 497  */
 498 #define BTRFS_FEATURE_INCOMPAT_BIG_METADATA     (1ULL << 5)
 499 #define BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF    (1ULL << 6)
 500 #define BTRFS_FEATURE_INCOMPAT_RAID56           (1ULL << 7)
 501 #define BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA  (1ULL << 8)
 502 #define BTRFS_FEATURE_INCOMPAT_NO_HOLES         (1ULL << 9)
 503
 504 #define BTRFS_FEATURE_COMPAT_SUPP               0ULL
 505
 506 /*
 507  * The FREE_SPACE_TREE and FREE_SPACE_TREE_VALID compat_ro bits must not be
 508  * added here until read-write support for the free space tree is implemented in
 509  * btrfs-progs.
 510  */
 511 #define BTRFS_FEATURE_COMPAT_RO_SUPP            0ULL
 512
 513 #define BTRFS_FEATURE_INCOMPAT_SUPP                     \
 514         (BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF |         \
 515          BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL |        \
 516          BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO |          \
 517          BTRFS_FEATURE_INCOMPAT_BIG_METADATA |          \
 518          BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF |         \
 519          BTRFS_FEATURE_INCOMPAT_RAID56 |                \
 520          BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS |          \
 521          BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA |       \
 522          BTRFS_FEATURE_INCOMPAT_NO_HOLES)
 523
 524 /*
 525  * A leaf is full of items. offset and size tell us where to find
 526  * the item in the leaf (relative to the start of the data area)
 527  */
 528 struct btrfs_item {
 529         struct btrfs_disk_key key;
 530         __le32 offset;
 531         __le32 size;
 532 } __attribute__ ((__packed__));
 533
 534 /*
 535  * leaves have an item area and a data area:
 536  * [item0, item1....itemN] [free space] [dataN...data1, data0]
 537  *
 538  * The data is separate from the items to get the keys closer together
 539  * during searches.
 540  */
 541 struct btrfs_leaf {
 542         struct btrfs_header header;
 543         struct btrfs_item items[];
 544 } __attribute__ ((__packed__));
 545
 546 /*
 547  * all non-leaf blocks are nodes, they hold only keys and pointers to
 548  * other blocks
 549  */
 550 struct btrfs_key_ptr {
 551         struct btrfs_disk_key key;
 552         __le64 blockptr;
 553         __le64 generation;
 554 } __attribute__ ((__packed__));
 555
 556 struct btrfs_node {
 557         struct btrfs_header header;
 558         struct btrfs_key_ptr ptrs[];
 559 } __attribute__ ((__packed__));
 560
 561 /*
 562  * btrfs_paths remember the path taken from the root down to the leaf.
 563  * level 0 is always the leaf, and nodes[1...BTRFS_MAX_LEVEL] will point
 564  * to any other levels that are present.
 565  *
 566  * The slots array records the index of the item or block pointer
 567  * used while walking the tree.
 568  */
 569
 570 struct btrfs_path {
 571         struct extent_buffer *nodes[BTRFS_MAX_LEVEL];
 572         int slots[BTRFS_MAX_LEVEL];
 573 #if 0
 574         /* The kernel locking sheme is not done in userspace. */
 575         int locks[BTRFS_MAX_LEVEL];
 576 #endif
 577         signed char reada;
 578         /* keep some upper locks as we walk down */
 579         u8 lowest_level;
 580
 581         /*
 582          * set by btrfs_split_item, tells search_slot to keep all locks
 583          * and to force calls to keep space in the nodes
 584          */
 585         u8 search_for_split;
 586         u8 skip_check_block;
 587 };
 588
 589 /*
 590  * items in the extent btree are used to record the objectid of the
 591  * owner of the block and the number of references
 592  */
 593
 594 struct btrfs_extent_item {
 595         __le64 refs;
 596         __le64 generation;
 597         __le64 flags;
 598 } __attribute__ ((__packed__));
 599
 600 struct btrfs_extent_item_v0 {
 601         __le32 refs;
 602 } __attribute__ ((__packed__));
 603
 604 #define BTRFS_MAX_EXTENT_ITEM_SIZE(r) ((BTRFS_LEAF_DATA_SIZE(r) >> 4) - \
 605                                         sizeof(struct btrfs_item))
 606 #define BTRFS_MAX_EXTENT_SIZE           SZ_128M
 607
 608 #define BTRFS_EXTENT_FLAG_DATA          (1ULL << 0)
 609 #define BTRFS_EXTENT_FLAG_TREE_BLOCK    (1ULL << 1)
 610
 611 /* following flags only apply to tree blocks */
 612
 613 /* use full backrefs for extent pointers in the block*/
 614 #define BTRFS_BLOCK_FLAG_FULL_BACKREF   (1ULL << 8)
 615
 616 struct btrfs_tree_block_info {
 617         struct btrfs_disk_key key;
 618         u8 level;
 619 } __attribute__ ((__packed__));
 620
 621 struct btrfs_extent_data_ref {
 622         __le64 root;
 623         __le64 objectid;
 624         __le64 offset;
 625         __le32 count;
 626 } __attribute__ ((__packed__));
 627
 628 struct btrfs_shared_data_ref {
 629         __le32 count;
 630 } __attribute__ ((__packed__));
 631
 632 struct btrfs_extent_inline_ref {
 633         u8 type;
 634         __le64 offset;
 635 } __attribute__ ((__packed__));
 636
 637 struct btrfs_extent_ref_v0 {
 638         __le64 root;
 639         __le64 generation;
 640         __le64 objectid;
 641         __le32 count;
 642 } __attribute__ ((__packed__));
 643
 644 /* dev extents record free space on individual devices.  The owner
 645  * field points back to the chunk allocation mapping tree that allocated
 646  * the extent.  The chunk tree uuid field is a way to double check the owner
 647  */
 648 struct btrfs_dev_extent {
 649         __le64 chunk_tree;
 650         __le64 chunk_objectid;
 651         __le64 chunk_offset;
 652         __le64 length;
 653         u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
 654 } __attribute__ ((__packed__));
 655
 656 struct btrfs_inode_ref {
 657         __le64 index;
 658         __le16 name_len;
 659         /* name goes here */
 660 } __attribute__ ((__packed__));
 661
 662 struct btrfs_inode_extref {
 663         __le64 parent_objectid;
 664         __le64 index;
 665         __le16 name_len;
 666         __u8   name[0]; /* name goes here */
 667 } __attribute__ ((__packed__));
 668
 669 struct btrfs_timespec {
 670         __le64 sec;
 671         __le32 nsec;
 672 } __attribute__ ((__packed__));
 673
 674 typedef enum {
 675         BTRFS_COMPRESS_NONE  = 0,
 676         BTRFS_COMPRESS_ZLIB  = 1,
 677         BTRFS_COMPRESS_LZO   = 2,
 678         BTRFS_COMPRESS_TYPES = 2,
 679         BTRFS_COMPRESS_LAST  = 3,
 680 } btrfs_compression_type;
 681
 682 /* we don't understand any encryption methods right now */
 683 typedef enum {
 684         BTRFS_ENCRYPTION_NONE = 0,
 685         BTRFS_ENCRYPTION_LAST = 1,
 686 } btrfs_encryption_type;
 687
 688 enum btrfs_tree_block_status {
 689         BTRFS_TREE_BLOCK_CLEAN,
 690         BTRFS_TREE_BLOCK_INVALID_NRITEMS,
 691         BTRFS_TREE_BLOCK_INVALID_PARENT_KEY,
 692         BTRFS_TREE_BLOCK_BAD_KEY_ORDER,
 693         BTRFS_TREE_BLOCK_INVALID_LEVEL,
 694         BTRFS_TREE_BLOCK_INVALID_FREE_SPACE,
 695         BTRFS_TREE_BLOCK_INVALID_OFFSETS,
 696 };
 697
 698 struct btrfs_inode_item {
 699         /* nfs style generation number */
 700         __le64 generation;
 701         /* transid that last touched this inode */
 702         __le64 transid;
 703         __le64 size;
 704         __le64 nbytes;
 705         __le64 block_group;
 706         __le32 nlink;
 707         __le32 uid;
 708         __le32 gid;
 709         __le32 mode;
 710         __le64 rdev;
 711         __le64 flags;
 712
 713         /* modification sequence number for NFS */
 714         __le64 sequence;
 715
 716         /*
 717          * a little future expansion, for more than this we can
 718          * just grow the inode item and version it
 719          */
 720         __le64 reserved[4];
 721         struct btrfs_timespec atime;
 722         struct btrfs_timespec ctime;
 723         struct btrfs_timespec mtime;
 724         struct btrfs_timespec otime;
 725 } __attribute__ ((__packed__));
 726
 727 struct btrfs_dir_log_item {
 728         __le64 end;
 729 } __attribute__ ((__packed__));
 730
 731 struct btrfs_dir_item {
 732         struct btrfs_disk_key location;
 733         __le64 transid;
 734         __le16 data_len;
 735         __le16 name_len;
 736         u8 type;
 737 } __attribute__ ((__packed__));
 738
 739 struct btrfs_root_item_v0 {
 740         struct btrfs_inode_item inode;
 741         __le64 generation;
 742         __le64 root_dirid;
 743         __le64 bytenr;
 744         __le64 byte_limit;
 745         __le64 bytes_used;
 746         __le64 last_snapshot;
 747         __le64 flags;
 748         __le32 refs;
 749         struct btrfs_disk_key drop_progress;
 750         u8 drop_level;
 751         u8 level;
 752 } __attribute__ ((__packed__));
 753
 754 struct btrfs_root_item {
 755         struct btrfs_inode_item inode;
 756         __le64 generation;
 757         __le64 root_dirid;
 758         __le64 bytenr;
 759         __le64 byte_limit;
 760         __le64 bytes_used;
 761         __le64 last_snapshot;
 762         __le64 flags;
 763         __le32 refs;
 764         struct btrfs_disk_key drop_progress;
 765         u8 drop_level;
 766         u8 level;
 767
 768         /*
 769          * The following fields appear after subvol_uuids+subvol_times
 770          * were introduced.
 771          */
 772
 773         /*
 774          * This generation number is used to test if the new fields are valid
 775          * and up to date while reading the root item. Every time the root item
 776          * is written out, the "generation" field is copied into this field. If
 777          * anyone ever mounted the fs with an older kernel, we will have
 778          * mismatching generation values here and thus must invalidate the
 779          * new fields. See btrfs_update_root and btrfs_find_last_root for
 780          * details.
 781          * the offset of generation_v2 is also used as the start for the memset
 782          * when invalidating the fields.
 783          */
 784         __le64 generation_v2;
 785         u8 uuid[BTRFS_UUID_SIZE];
 786         u8 parent_uuid[BTRFS_UUID_SIZE];
 787         u8 received_uuid[BTRFS_UUID_SIZE];
 788         __le64 ctransid; /* updated when an inode changes */
 789         __le64 otransid; /* trans when created */
 790         __le64 stransid; /* trans when sent. non-zero for received subvol */
 791         __le64 rtransid; /* trans when received. non-zero for received subvol */
 792         struct btrfs_timespec ctime;
 793         struct btrfs_timespec otime;
 794         struct btrfs_timespec stime;
 795         struct btrfs_timespec rtime;
 796         __le64 reserved[8]; /* for future */
 797 } __attribute__ ((__packed__));
 798
 799 /*
 800  * this is used for both forward and backward root refs
 801  */
 802 struct btrfs_root_ref {
 803         __le64 dirid;
 804         __le64 sequence;
 805         __le16 name_len;
 806 } __attribute__ ((__packed__));
 807
 808 struct btrfs_disk_balance_args {
 809         /*
 810          * profiles to operate on, single is denoted by
 811          * BTRFS_AVAIL_ALLOC_BIT_SINGLE
 812          */
 813         __le64 profiles;
 814
 815         /*
 816          * usage filter
 817          * BTRFS_BALANCE_ARGS_USAGE with a single value means '0..N'
 818          * BTRFS_BALANCE_ARGS_USAGE_RANGE - range syntax, min..max
 819          */
 820         union {
 821                 __le64 usage;
 822                 struct {
 823                         __le32 usage_min;
 824                         __le32 usage_max;
 825                 };
 826         };
 827
 828         /* devid filter */
 829         __le64 devid;
 830
 831         /* devid subset filter [pstart..pend) */
 832         __le64 pstart;
 833         __le64 pend;
 834
 835         /* btrfs virtual address space subset filter [vstart..vend) */
 836         __le64 vstart;
 837         __le64 vend;
 838
 839         /*
 840          * profile to convert to, single is denoted by
 841          * BTRFS_AVAIL_ALLOC_BIT_SINGLE
 842          */
 843         __le64 target;
 844
 845         /* BTRFS_BALANCE_ARGS_* */
 846         __le64 flags;
 847
 848         /*
 849          * BTRFS_BALANCE_ARGS_LIMIT with value 'limit'
 850          * BTRFS_BALANCE_ARGS_LIMIT_RANGE - the extend version can use minimum
 851          * and maximum
 852          */
 853         union {
 854                 __le64 limit;
 855                 struct {
 856                         __le32 limit_min;
 857                         __le32 limit_max;
 858                 };
 859         };
 860
 861         /*
 862          * Process chunks that cross stripes_min..stripes_max devices,
 863          * BTRFS_BALANCE_ARGS_STRIPES_RANGE
 864          */
 865         __le32 stripes_min;
 866         __le32 stripes_max;
 867
 868         __le64 unused[6];
 869 } __attribute__ ((__packed__));
 870
 871 /*
 872  * store balance parameters to disk so that balance can be properly
 873  * resumed after crash or unmount
 874  */
 875 struct btrfs_balance_item {
 876         /* BTRFS_BALANCE_* */
 877         __le64 flags;
 878
 879         struct btrfs_disk_balance_args data;
 880         struct btrfs_disk_balance_args meta;
 881         struct btrfs_disk_balance_args sys;
 882
 883         __le64 unused[4];
 884 } __attribute__ ((__packed__));
 885
 886 #define BTRFS_FILE_EXTENT_INLINE 0
 887 #define BTRFS_FILE_EXTENT_REG 1
 888 #define BTRFS_FILE_EXTENT_PREALLOC 2
 889
 890 struct btrfs_file_extent_item {
 891         /*
 892          * transaction id that created this extent
 893          */
 894         __le64 generation;
 895         /*
 896          * max number of bytes to hold this extent in ram
 897          * when we split a compressed extent we can't know how big
 898          * each of the resulting pieces will be.  So, this is
 899          * an upper limit on the size of the extent in ram instead of
 900          * an exact limit.
 901          */
 902         __le64 ram_bytes;
 903
 904         /*
 905          * 32 bits for the various ways we might encode the data,
 906          * including compression and encryption.  If any of these
 907          * are set to something a given disk format doesn't understand
 908          * it is treated like an incompat flag for reading and writing,
 909          * but not for stat.
 910          */
 911         u8 compression;
 912         u8 encryption;
 913         __le16 other_encoding; /* spare for later use */
 914
 915         /* are we inline data or a real extent? */
 916         u8 type;
 917
 918         /*
 919          * disk space consumed by the extent, checksum blocks are included
 920          * in these numbers
 921          */
 922         __le64 disk_bytenr;
 923         __le64 disk_num_bytes;
 924         /*
 925          * the logical offset in file blocks (no csums)
 926          * this extent record is for.  This allows a file extent to point
 927          * into the middle of an existing extent on disk, sharing it
 928          * between two snapshots (useful if some bytes in the middle of the
 929          * extent have changed
 930          */
 931         __le64 offset;
 932         /*
 933          * the logical number of file blocks (no csums included)
 934          */
 935         __le64 num_bytes;
 936
 937 } __attribute__ ((__packed__));
 938
 939 struct btrfs_dev_stats_item {
 940         /*
 941          * grow this item struct at the end for future enhancements and keep
 942          * the existing values unchanged
 943          */
 944         __le64 values[BTRFS_DEV_STAT_VALUES_MAX];
 945 } __attribute__ ((__packed__));
 946
 947 struct btrfs_csum_item {
 948         u8 csum;
 949 } __attribute__ ((__packed__));
 950
 951 /*
 952  * We don't want to overwrite 1M at the beginning of device, even though
 953  * there is our 1st superblock at 64k. Some possible reasons:
 954  *  - the first 64k blank is useful for some boot loader/manager
 955  *  - the first 1M could be scratched by buggy partitioner or somesuch
 956  */
 957 #define BTRFS_BLOCK_RESERVED_1M_FOR_SUPER       ((u64)SZ_1M)
 958
 959 /* tag for the radix tree of block groups in ram */
 960 #define BTRFS_BLOCK_GROUP_DATA          (1ULL << 0)
 961 #define BTRFS_BLOCK_GROUP_SYSTEM        (1ULL << 1)
 962 #define BTRFS_BLOCK_GROUP_METADATA      (1ULL << 2)
 963 #define BTRFS_BLOCK_GROUP_RAID0         (1ULL << 3)
 964 #define BTRFS_BLOCK_GROUP_RAID1         (1ULL << 4)
 965 #define BTRFS_BLOCK_GROUP_DUP           (1ULL << 5)
 966 #define BTRFS_BLOCK_GROUP_RAID10        (1ULL << 6)
 967 #define BTRFS_BLOCK_GROUP_RAID5         (1ULL << 7)
 968 #define BTRFS_BLOCK_GROUP_RAID6         (1ULL << 8)
 969 #define BTRFS_BLOCK_GROUP_RESERVED      BTRFS_AVAIL_ALLOC_BIT_SINGLE
 970 #define BTRFS_NR_RAID_TYPES             7
 971
 972 #define BTRFS_BLOCK_GROUP_TYPE_MASK     (BTRFS_BLOCK_GROUP_DATA |    \
 973                                          BTRFS_BLOCK_GROUP_SYSTEM |  \
 974                                          BTRFS_BLOCK_GROUP_METADATA)
 975
 976 #define BTRFS_BLOCK_GROUP_PROFILE_MASK  (BTRFS_BLOCK_GROUP_RAID0 |   \
 977                                          BTRFS_BLOCK_GROUP_RAID1 |   \
 978                                          BTRFS_BLOCK_GROUP_RAID5 |   \
 979                                          BTRFS_BLOCK_GROUP_RAID6 |   \
 980                                          BTRFS_BLOCK_GROUP_DUP |     \
 981                                          BTRFS_BLOCK_GROUP_RAID10)
 982
 983 /* used in struct btrfs_balance_args fields */
 984 #define BTRFS_AVAIL_ALLOC_BIT_SINGLE    (1ULL << 48)
 985
 986 /*
 987  * GLOBAL_RSV does not exist as a on-disk block group type and is used
 988  * internally for exporting info about global block reserve from space infos
 989  */
 990 #define BTRFS_SPACE_INFO_GLOBAL_RSV    (1ULL << 49)
 991
 992 #define BTRFS_QGROUP_LEVEL_SHIFT                48
 993
 994 static inline u64 btrfs_qgroup_level(u64 qgroupid)
 995 {
 996         return qgroupid >> BTRFS_QGROUP_LEVEL_SHIFT;
 997 }
 998
 999 static inline u64 btrfs_qgroup_subvid(u64 qgroupid)
1000 {
1001         return qgroupid & ((1ULL << BTRFS_QGROUP_LEVEL_SHIFT) - 1);
1002 }
1003
1004 #define BTRFS_QGROUP_STATUS_FLAG_ON             (1ULL << 0)
1005 #define BTRFS_QGROUP_STATUS_FLAG_RESCAN         (1ULL << 1)
1006 #define BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT   (1ULL << 2)
1007
1008 struct btrfs_qgroup_status_item {
1009         __le64 version;
1010         __le64 generation;
1011         __le64 flags;
1012         __le64 rescan;          /* progress during scanning */
1013 } __attribute__ ((__packed__));
1014
1015 struct btrfs_block_group_item {
1016         __le64 used;
1017         __le64 chunk_objectid;
1018         __le64 flags;
1019 } __attribute__ ((__packed__));
1020
1021 struct btrfs_free_space_info {
1022         __le32 extent_count;
1023         __le32 flags;
1024 } __attribute__ ((__packed__));
1025
1026 #define BTRFS_FREE_SPACE_USING_BITMAPS (1ULL << 0)
1027
1028 struct btrfs_qgroup_info_item {
1029         __le64 generation;
1030         __le64 referenced;
1031         __le64 referenced_compressed;
1032         __le64 exclusive;
1033         __le64 exclusive_compressed;
1034 } __attribute__ ((__packed__));
1035
1036 /* flags definition for qgroup limits */
1037 #define BTRFS_QGROUP_LIMIT_MAX_RFER     (1ULL << 0)
1038 #define BTRFS_QGROUP_LIMIT_MAX_EXCL     (1ULL << 1)
1039 #define BTRFS_QGROUP_LIMIT_RSV_RFER     (1ULL << 2)
1040 #define BTRFS_QGROUP_LIMIT_RSV_EXCL     (1ULL << 3)
1041 #define BTRFS_QGROUP_LIMIT_RFER_CMPR    (1ULL << 4)
1042 #define BTRFS_QGROUP_LIMIT_EXCL_CMPR    (1ULL << 5)
1043
1044 struct btrfs_qgroup_limit_item {
1045         __le64 flags;
1046         __le64 max_referenced;
1047         __le64 max_exclusive;
1048         __le64 rsv_referenced;
1049         __le64 rsv_exclusive;
1050 } __attribute__ ((__packed__));
1051
1052 struct btrfs_space_info {
1053         u64 flags;
1054         u64 total_bytes;
1055         u64 bytes_used;
1056         u64 bytes_pinned;
1057         int full;
1058         struct list_head list;
1059 };
1060
1061 struct btrfs_block_group_cache {
1062         struct cache_extent cache;
1063         struct btrfs_key key;
1064         struct btrfs_block_group_item item;
1065         struct btrfs_space_info *space_info;
1066         struct btrfs_free_space_ctl *free_space_ctl;
1067         u64 bytes_super;
1068         u64 pinned;
1069         u64 flags;
1070         int cached;
1071         int ro;
1072 };
1073
1074 struct btrfs_device;
1075 struct btrfs_fs_devices;
1076 struct btrfs_fs_info {
1077         u8 fsid[BTRFS_FSID_SIZE];
1078         u8 *new_fsid;
1079         u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
1080         u8 *new_chunk_tree_uuid;
1081         struct btrfs_root *fs_root;
1082         struct btrfs_root *extent_root;
1083         struct btrfs_root *tree_root;
1084         struct btrfs_root *chunk_root;
1085         struct btrfs_root *dev_root;
1086         struct btrfs_root *csum_root;
1087         struct btrfs_root *quota_root;
1088         struct btrfs_root *free_space_root;
1089
1090         struct rb_root fs_root_tree;
1091
1092         /* the log root tree is a directory of all the other log roots */
1093         struct btrfs_root *log_root_tree;
1094
1095         struct extent_io_tree extent_cache;
1096         struct extent_io_tree free_space_cache;
1097         struct extent_io_tree block_group_cache;
1098         struct extent_io_tree pinned_extents;
1099         struct extent_io_tree pending_del;
1100         struct extent_io_tree extent_ins;
1101         struct extent_io_tree *excluded_extents;
1102
1103         /* logical->physical extent mapping */
1104         struct btrfs_mapping_tree mapping_tree;
1105
1106         u64 generation;
1107         u64 last_trans_committed;
1108
1109         u64 avail_data_alloc_bits;
1110         u64 avail_metadata_alloc_bits;
1111         u64 avail_system_alloc_bits;
1112         u64 data_alloc_profile;
1113         u64 metadata_alloc_profile;
1114         u64 system_alloc_profile;
1115         u64 alloc_start;
1116
1117         struct btrfs_trans_handle *running_transaction;
1118         struct btrfs_super_block *super_copy;
1119         struct mutex fs_mutex;
1120
1121         u64 super_bytenr;
1122         u64 total_pinned;
1123
1124         struct list_head dirty_cowonly_roots;
1125         struct list_head recow_ebs;
1126
1127         struct btrfs_fs_devices *fs_devices;
1128         struct list_head space_info;
1129         int system_allocs;
1130
1131         unsigned int readonly:1;
1132         unsigned int on_restoring:1;
1133         unsigned int is_chunk_recover:1;
1134         unsigned int quota_enabled:1;
1135         unsigned int suppress_check_block_errors:1;
1136         unsigned int ignore_fsid_mismatch:1;
1137         unsigned int ignore_chunk_tree_error:1;
1138         unsigned int avoid_meta_chunk_alloc:1;
1139         unsigned int avoid_sys_chunk_alloc:1;
1140         unsigned int finalize_on_close:1;
1141
1142         int (*free_extent_hook)(struct btrfs_trans_handle *trans,
1143                                 struct btrfs_root *root,
1144                                 u64 bytenr, u64 num_bytes, u64 parent,
1145                                 u64 root_objectid, u64 owner, u64 offset,
1146                                 int refs_to_drop);
1147         struct cache_tree *fsck_extent_cache;
1148         struct cache_tree *corrupt_blocks;
1149
1150 };
1151
1152 /*
1153  * in ram representation of the tree.  extent_root is used for all allocations
1154  * and for the extent tree extent_root root.
1155  */
1156 struct btrfs_root {
1157         struct extent_buffer *node;
1158         struct extent_buffer *commit_root;
1159         struct btrfs_root_item root_item;
1160         struct btrfs_key root_key;
1161         struct btrfs_fs_info *fs_info;
1162         u64 objectid;
1163         u64 last_trans;
1164
1165         /* data allocations are done in sectorsize units */
1166         u32 sectorsize;
1167
1168         /* node allocations are done in nodesize units */
1169         u32 nodesize;
1170
1171         /* Unused, equal to nodesize */
1172         u32 leafsize;
1173
1174         /* leaf allocations are done in nodesize units */
1175         u32 stripesize;
1176
1177         int ref_cows;
1178         int track_dirty;
1179
1180
1181         u32 type;
1182         u64 last_inode_alloc;
1183
1184         /*
1185          * Record orphan data extent ref
1186          *
1187          * TODO: Don't restore things in btrfs_root.
1188          * Directly record it into inode_record, which needs a lot of
1189          * infrastructure change to allow cooperation between extent
1190          * and fs tree scan.
1191          */
1192         struct list_head orphan_data_extents;
1193
1194         /* the dirty list is only used by non-reference counted roots */
1195         struct list_head dirty_list;
1196         struct rb_node rb_node;
1197 };
1198
1199 /*
1200  * inode items have the data typically returned from stat and store other
1201  * info about object characteristics.  There is one for every file and dir in
1202  * the FS
1203  */
1204 #define BTRFS_INODE_ITEM_KEY            1
1205 #define BTRFS_INODE_REF_KEY             12
1206 #define BTRFS_INODE_EXTREF_KEY          13
1207 #define BTRFS_XATTR_ITEM_KEY            24
1208 #define BTRFS_ORPHAN_ITEM_KEY           48
1209
1210 #define BTRFS_DIR_LOG_ITEM_KEY  60
1211 #define BTRFS_DIR_LOG_INDEX_KEY 72
1212 /*
1213  * dir items are the name -> inode pointers in a directory.  There is one
1214  * for every name in a directory.
1215  */
1216 #define BTRFS_DIR_ITEM_KEY      84
1217 #define BTRFS_DIR_INDEX_KEY     96
1218
1219 /*
1220  * extent data is for file data
1221  */
1222 #define BTRFS_EXTENT_DATA_KEY   108
1223
1224 /*
1225  * csum items have the checksums for data in the extents
1226  */
1227 #define BTRFS_CSUM_ITEM_KEY     120
1228 /*
1229  * extent csums are stored in a separate tree and hold csums for
1230  * an entire extent on disk.
1231  */
1232 #define BTRFS_EXTENT_CSUM_KEY   128
1233
1234 /*
1235  * root items point to tree roots.  There are typically in the root
1236  * tree used by the super block to find all the other trees
1237  */
1238 #define BTRFS_ROOT_ITEM_KEY     132
1239
1240 /*
1241  * root backrefs tie subvols and snapshots to the directory entries that
1242  * reference them
1243  */
1244 #define BTRFS_ROOT_BACKREF_KEY  144
1245
1246 /*
1247  * root refs make a fast index for listing all of the snapshots and
1248  * subvolumes referenced by a given root.  They point directly to the
1249  * directory item in the root that references the subvol
1250  */
1251 #define BTRFS_ROOT_REF_KEY      156
1252
1253 /*
1254  * extent items are in the extent map tree.  These record which blocks
1255  * are used, and how many references there are to each block
1256  */
1257 #define BTRFS_EXTENT_ITEM_KEY   168
1258
1259 /*
1260  * The same as the BTRFS_EXTENT_ITEM_KEY, except it's metadata we already know
1261  * the length, so we save the level in key->offset instead of the length.
1262  */
1263 #define BTRFS_METADATA_ITEM_KEY 169
1264
1265 #define BTRFS_TREE_BLOCK_REF_KEY        176
1266
1267 #define BTRFS_EXTENT_DATA_REF_KEY       178
1268
1269 /* old style extent backrefs */
1270 #define BTRFS_EXTENT_REF_V0_KEY         180
1271
1272 #define BTRFS_SHARED_BLOCK_REF_KEY      182
1273
1274 #define BTRFS_SHARED_DATA_REF_KEY       184
1275
1276
1277 /*
1278  * block groups give us hints into the extent allocation trees.  Which
1279  * blocks are free etc etc
1280  */
1281 #define BTRFS_BLOCK_GROUP_ITEM_KEY 192
1282
1283 /*
1284  * Every block group is represented in the free space tree by a free space info
1285  * item, which stores some accounting information. It is keyed on
1286  * (block_group_start, FREE_SPACE_INFO, block_group_length).
1287  */
1288 #define BTRFS_FREE_SPACE_INFO_KEY 198
1289
1290 /*
1291  * A free space extent tracks an extent of space that is free in a block group.
1292  * It is keyed on (start, FREE_SPACE_EXTENT, length).
1293  */
1294 #define BTRFS_FREE_SPACE_EXTENT_KEY 199
1295
1296 /*
1297  * When a block group becomes very fragmented, we convert it to use bitmaps
1298  * instead of extents. A free space bitmap is keyed on
1299  * (start, FREE_SPACE_BITMAP, length); the corresponding item is a bitmap with
1300  * (length / sectorsize) bits.
1301  */
1302 #define BTRFS_FREE_SPACE_BITMAP_KEY 200
1303
1304 #define BTRFS_DEV_EXTENT_KEY    204
1305 #define BTRFS_DEV_ITEM_KEY      216
1306 #define BTRFS_CHUNK_ITEM_KEY    228
1307
1308 #define BTRFS_BALANCE_ITEM_KEY  248
1309
1310 /*
1311  * quota groups
1312  */
1313 #define BTRFS_QGROUP_STATUS_KEY         240
1314 #define BTRFS_QGROUP_INFO_KEY           242
1315 #define BTRFS_QGROUP_LIMIT_KEY          244
1316 #define BTRFS_QGROUP_RELATION_KEY       246
1317
1318 /*
1319  * Obsolete name, see BTRFS_TEMPORARY_ITEM_KEY.
1320  */
1321 #define BTRFS_BALANCE_ITEM_KEY  248
1322
1323 /*
1324  * The key type for tree items that are stored persistently, but do not need to
1325  * exist for extended period of time. The items can exist in any tree.
1326  *
1327  * [subtype, BTRFS_TEMPORARY_ITEM_KEY, data]
1328  *
1329  * Existing items:
1330  *
1331  * - balance status item
1332  *   (BTRFS_BALANCE_OBJECTID, BTRFS_TEMPORARY_ITEM_KEY, 0)
1333  */
1334 #define BTRFS_TEMPORARY_ITEM_KEY        248
1335
1336 /*
1337  * Obsolete name, see BTRFS_PERSISTENT_ITEM_KEY
1338  */
1339 #define BTRFS_DEV_STATS_KEY             249
1340
1341 /*
1342  * The key type for tree items that are stored persistently and usually exist
1343  * for a long period, eg. filesystem lifetime. The item kinds can be status
1344  * information, stats or preference values. The item can exist in any tree.
1345  *
1346  * [subtype, BTRFS_PERSISTENT_ITEM_KEY, data]
1347  *
1348  * Existing items:
1349  *
1350  * - device statistics, store IO stats in the device tree, one key for all
1351  *   stats
1352  *   (BTRFS_DEV_STATS_OBJECTID, BTRFS_DEV_STATS_KEY, 0)
1353  */
1354 #define BTRFS_PERSISTENT_ITEM_KEY       249
1355
1356 /*
1357  * Persistently stores the device replace state in the device tree.
1358  * The key is built like this: (0, BTRFS_DEV_REPLACE_KEY, 0).
1359  */
1360 #define BTRFS_DEV_REPLACE_KEY   250
1361
1362 /*
1363  * Stores items that allow to quickly map UUIDs to something else.
1364  * These items are part of the filesystem UUID tree.
1365  * The key is built like this:
1366  * (UUID_upper_64_bits, BTRFS_UUID_KEY*, UUID_lower_64_bits).
1367  */
1368 #if BTRFS_UUID_SIZE != 16
1369 #error "UUID items require BTRFS_UUID_SIZE == 16!"
1370 #endif
1371 #define BTRFS_UUID_KEY_SUBVOL   251     /* for UUIDs assigned to subvols */
1372 #define BTRFS_UUID_KEY_RECEIVED_SUBVOL  252     /* for UUIDs assigned to
1373                                                  * received subvols */
1374
1375 /*
1376  * string items are for debugging.  They just store a short string of
1377  * data in the FS
1378  */
1379 #define BTRFS_STRING_ITEM_KEY   253
1380 /*
1381  * Inode flags
1382  */
1383 #define BTRFS_INODE_NODATASUM           (1 << 0)
1384 #define BTRFS_INODE_NODATACOW           (1 << 1)
1385 #define BTRFS_INODE_READONLY            (1 << 2)
1386 #define BTRFS_INODE_NOCOMPRESS          (1 << 3)
1387 #define BTRFS_INODE_PREALLOC            (1 << 4)
1388 #define BTRFS_INODE_SYNC                (1 << 5)
1389 #define BTRFS_INODE_IMMUTABLE           (1 << 6)
1390 #define BTRFS_INODE_APPEND              (1 << 7)
1391 #define BTRFS_INODE_NODUMP              (1 << 8)
1392 #define BTRFS_INODE_NOATIME             (1 << 9)
1393 #define BTRFS_INODE_DIRSYNC             (1 << 10)
1394 #define BTRFS_INODE_COMPRESS            (1 << 11)
1395
1396 #define read_eb_member(eb, ptr, type, member, result) (                 \
1397         read_extent_buffer(eb, (char *)(result),                        \
1398                            ((unsigned long)(ptr)) +                     \
1399                             offsetof(type, member),                     \
1400                            sizeof(((type *)0)->member)))
1401
1402 #define write_eb_member(eb, ptr, type, member, result) (                \
1403         write_extent_buffer(eb, (char *)(result),                       \
1404                            ((unsigned long)(ptr)) +                     \
1405                             offsetof(type, member),                     \
1406                            sizeof(((type *)0)->member)))
1407
1408 #define BTRFS_SETGET_HEADER_FUNCS(name, type, member, bits)             \
1409 static inline u##bits btrfs_##name(const struct extent_buffer *eb)      \
1410 {                                                                       \
1411         const struct btrfs_header *h = (struct btrfs_header *)eb->data; \
1412         return le##bits##_to_cpu(h->member);                            \
1413 }                                                                       \
1414 static inline void btrfs_set_##name(struct extent_buffer *eb,           \
1415                                     u##bits val)                        \
1416 {                                                                       \
1417         struct btrfs_header *h = (struct btrfs_header *)eb->data;       \
1418         h->member = cpu_to_le##bits(val);                               \
1419 }
1420
1421 #define BTRFS_SETGET_FUNCS(name, type, member, bits)                    \
1422 static inline u##bits btrfs_##name(const struct extent_buffer *eb,      \
1423                                    const type *s)                       \
1424 {                                                                       \
1425         unsigned long offset = (unsigned long)s;                        \
1426         const type *p = (type *) (eb->data + offset);                   \
1427         return get_unaligned_le##bits(&p->member);                      \
1428 }                                                                       \
1429 static inline void btrfs_set_##name(struct extent_buffer *eb,           \
1430                                     type *s, u##bits val)               \
1431 {                                                                       \
1432         unsigned long offset = (unsigned long)s;                        \
1433         type *p = (type *) (eb->data + offset);                         \
1434         put_unaligned_le##bits(val, &p->member);                        \
1435 }
1436
1437 #define BTRFS_SETGET_STACK_FUNCS(name, type, member, bits)              \
1438 static inline u##bits btrfs_##name(const type *s)                       \
1439 {                                                                       \
1440         return le##bits##_to_cpu(s->member);                            \
1441 }                                                                       \
1442 static inline void btrfs_set_##name(type *s, u##bits val)               \
1443 {                                                                       \
1444         s->member = cpu_to_le##bits(val);                               \
1445 }
1446
1447 BTRFS_SETGET_FUNCS(device_type, struct btrfs_dev_item, type, 64);
1448 BTRFS_SETGET_FUNCS(device_total_bytes, struct btrfs_dev_item, total_bytes, 64);
1449 BTRFS_SETGET_FUNCS(device_bytes_used, struct btrfs_dev_item, bytes_used, 64);
1450 BTRFS_SETGET_FUNCS(device_io_align, struct btrfs_dev_item, io_align, 32);
1451 BTRFS_SETGET_FUNCS(device_io_width, struct btrfs_dev_item, io_width, 32);
1452 BTRFS_SETGET_FUNCS(device_start_offset, struct btrfs_dev_item,
1453                    start_offset, 64);
1454 BTRFS_SETGET_FUNCS(device_sector_size, struct btrfs_dev_item, sector_size, 32);
1455 BTRFS_SETGET_FUNCS(device_id, struct btrfs_dev_item, devid, 64);
1456 BTRFS_SETGET_FUNCS(device_group, struct btrfs_dev_item, dev_group, 32);
1457 BTRFS_SETGET_FUNCS(device_seek_speed, struct btrfs_dev_item, seek_speed, 8);
1458 BTRFS_SETGET_FUNCS(device_bandwidth, struct btrfs_dev_item, bandwidth, 8);
1459 BTRFS_SETGET_FUNCS(device_generation, struct btrfs_dev_item, generation, 64);
1460
1461 BTRFS_SETGET_STACK_FUNCS(stack_device_type, struct btrfs_dev_item, type, 64);
1462 BTRFS_SETGET_STACK_FUNCS(stack_device_total_bytes, struct btrfs_dev_item,
1463                          total_bytes, 64);
1464 BTRFS_SETGET_STACK_FUNCS(stack_device_bytes_used, struct btrfs_dev_item,
1465                          bytes_used, 64);
1466 BTRFS_SETGET_STACK_FUNCS(stack_device_io_align, struct btrfs_dev_item,
1467                          io_align, 32);
1468 BTRFS_SETGET_STACK_FUNCS(stack_device_io_width, struct btrfs_dev_item,
1469                          io_width, 32);
1470 BTRFS_SETGET_STACK_FUNCS(stack_device_sector_size, struct btrfs_dev_item,
1471                          sector_size, 32);
1472 BTRFS_SETGET_STACK_FUNCS(stack_device_id, struct btrfs_dev_item, devid, 64);
1473 BTRFS_SETGET_STACK_FUNCS(stack_device_group, struct btrfs_dev_item,
1474                          dev_group, 32);
1475 BTRFS_SETGET_STACK_FUNCS(stack_device_seek_speed, struct btrfs_dev_item,
1476                          seek_speed, 8);
1477 BTRFS_SETGET_STACK_FUNCS(stack_device_bandwidth, struct btrfs_dev_item,
1478                          bandwidth, 8);
1479 BTRFS_SETGET_STACK_FUNCS(stack_device_generation, struct btrfs_dev_item,
1480                          generation, 64);
1481
1482 static inline char *btrfs_device_uuid(struct btrfs_dev_item *d)
1483 {
1484         return (char *)d + offsetof(struct btrfs_dev_item, uuid);
1485 }
1486
1487 static inline char *btrfs_device_fsid(struct btrfs_dev_item *d)
1488 {
1489         return (char *)d + offsetof(struct btrfs_dev_item, fsid);
1490 }
1491
1492 BTRFS_SETGET_FUNCS(chunk_length, struct btrfs_chunk, length, 64);
1493 BTRFS_SETGET_FUNCS(chunk_owner, struct btrfs_chunk, owner, 64);
1494 BTRFS_SETGET_FUNCS(chunk_stripe_len, struct btrfs_chunk, stripe_len, 64);
1495 BTRFS_SETGET_FUNCS(chunk_io_align, struct btrfs_chunk, io_align, 32);
1496 BTRFS_SETGET_FUNCS(chunk_io_width, struct btrfs_chunk, io_width, 32);
1497 BTRFS_SETGET_FUNCS(chunk_sector_size, struct btrfs_chunk, sector_size, 32);
1498 BTRFS_SETGET_FUNCS(chunk_type, struct btrfs_chunk, type, 64);
1499 BTRFS_SETGET_FUNCS(chunk_num_stripes, struct btrfs_chunk, num_stripes, 16);
1500 BTRFS_SETGET_FUNCS(chunk_sub_stripes, struct btrfs_chunk, sub_stripes, 16);
1501 BTRFS_SETGET_FUNCS(stripe_devid, struct btrfs_stripe, devid, 64);
1502 BTRFS_SETGET_FUNCS(stripe_offset, struct btrfs_stripe, offset, 64);
1503
1504 static inline char *btrfs_stripe_dev_uuid(struct btrfs_stripe *s)
1505 {
1506         return (char *)s + offsetof(struct btrfs_stripe, dev_uuid);
1507 }
1508
1509 BTRFS_SETGET_STACK_FUNCS(stack_chunk_length, struct btrfs_chunk, length, 64);
1510 BTRFS_SETGET_STACK_FUNCS(stack_chunk_owner, struct btrfs_chunk, owner, 64);
1511 BTRFS_SETGET_STACK_FUNCS(stack_chunk_stripe_len, struct btrfs_chunk,
1512                          stripe_len, 64);
1513 BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_align, struct btrfs_chunk,
1514                          io_align, 32);
1515 BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_width, struct btrfs_chunk,
1516                          io_width, 32);
1517 BTRFS_SETGET_STACK_FUNCS(stack_chunk_sector_size, struct btrfs_chunk,
1518                          sector_size, 32);
1519 BTRFS_SETGET_STACK_FUNCS(stack_chunk_type, struct btrfs_chunk, type, 64);
1520 BTRFS_SETGET_STACK_FUNCS(stack_chunk_num_stripes, struct btrfs_chunk,
1521                          num_stripes, 16);
1522 BTRFS_SETGET_STACK_FUNCS(stack_chunk_sub_stripes, struct btrfs_chunk,
1523                          sub_stripes, 16);
1524 BTRFS_SETGET_STACK_FUNCS(stack_stripe_devid, struct btrfs_stripe, devid, 64);
1525 BTRFS_SETGET_STACK_FUNCS(stack_stripe_offset, struct btrfs_stripe, offset, 64);
1526
1527 static inline struct btrfs_stripe *btrfs_stripe_nr(struct btrfs_chunk *c,
1528                                                    int nr)
1529 {
1530         unsigned long offset = (unsigned long)c;
1531         offset += offsetof(struct btrfs_chunk, stripe);
1532         offset += nr * sizeof(struct btrfs_stripe);
1533         return (struct btrfs_stripe *)offset;
1534 }
1535
1536 static inline char *btrfs_stripe_dev_uuid_nr(struct btrfs_chunk *c, int nr)
1537 {
1538         return btrfs_stripe_dev_uuid(btrfs_stripe_nr(c, nr));
1539 }
1540
1541 static inline u64 btrfs_stripe_offset_nr(struct extent_buffer *eb,
1542                                          struct btrfs_chunk *c, int nr)
1543 {
1544         return btrfs_stripe_offset(eb, btrfs_stripe_nr(c, nr));
1545 }
1546
1547 static inline void btrfs_set_stripe_offset_nr(struct extent_buffer *eb,
1548                                              struct btrfs_chunk *c, int nr,
1549                                              u64 val)
1550 {
1551         btrfs_set_stripe_offset(eb, btrfs_stripe_nr(c, nr), val);
1552 }
1553
1554 static inline u64 btrfs_stripe_devid_nr(struct extent_buffer *eb,
1555                                          struct btrfs_chunk *c, int nr)
1556 {
1557         return btrfs_stripe_devid(eb, btrfs_stripe_nr(c, nr));
1558 }
1559
1560 static inline void btrfs_set_stripe_devid_nr(struct extent_buffer *eb,
1561                                              struct btrfs_chunk *c, int nr,
1562                                              u64 val)
1563 {
1564         btrfs_set_stripe_devid(eb, btrfs_stripe_nr(c, nr), val);
1565 }
1566
1567 /* struct btrfs_block_group_item */
1568 BTRFS_SETGET_STACK_FUNCS(block_group_used, struct btrfs_block_group_item,
1569                          used, 64);
1570 BTRFS_SETGET_FUNCS(disk_block_group_used, struct btrfs_block_group_item,
1571                          used, 64);
1572 BTRFS_SETGET_STACK_FUNCS(block_group_chunk_objectid,
1573                         struct btrfs_block_group_item, chunk_objectid, 64);
1574
1575 BTRFS_SETGET_FUNCS(disk_block_group_chunk_objectid,
1576                    struct btrfs_block_group_item, chunk_objectid, 64);
1577 BTRFS_SETGET_FUNCS(disk_block_group_flags,
1578                    struct btrfs_block_group_item, flags, 64);
1579 BTRFS_SETGET_STACK_FUNCS(block_group_flags,
1580                         struct btrfs_block_group_item, flags, 64);
1581
1582 /* struct btrfs_free_space_info */
1583 BTRFS_SETGET_FUNCS(free_space_extent_count, struct btrfs_free_space_info,
1584                    extent_count, 32);
1585 BTRFS_SETGET_FUNCS(free_space_flags, struct btrfs_free_space_info, flags, 32);
1586
1587 /* struct btrfs_inode_ref */
1588 BTRFS_SETGET_FUNCS(inode_ref_name_len, struct btrfs_inode_ref, name_len, 16);
1589 BTRFS_SETGET_STACK_FUNCS(stack_inode_ref_name_len, struct btrfs_inode_ref, name_len, 16);
1590 BTRFS_SETGET_FUNCS(inode_ref_index, struct btrfs_inode_ref, index, 64);
1591
1592 /* struct btrfs_inode_extref */
1593 BTRFS_SETGET_FUNCS(inode_extref_parent, struct btrfs_inode_extref,
1594                    parent_objectid, 64);
1595 BTRFS_SETGET_FUNCS(inode_extref_name_len, struct btrfs_inode_extref,
1596                    name_len, 16);
1597 BTRFS_SETGET_FUNCS(inode_extref_index, struct btrfs_inode_extref, index, 64);
1598
1599 /* struct btrfs_inode_item */
1600 BTRFS_SETGET_FUNCS(inode_generation, struct btrfs_inode_item, generation, 64);
1601 BTRFS_SETGET_FUNCS(inode_sequence, struct btrfs_inode_item, sequence, 64);
1602 BTRFS_SETGET_FUNCS(inode_transid, struct btrfs_inode_item, transid, 64);
1603 BTRFS_SETGET_FUNCS(inode_size, struct btrfs_inode_item, size, 64);
1604 BTRFS_SETGET_FUNCS(inode_nbytes, struct btrfs_inode_item, nbytes, 64);
1605 BTRFS_SETGET_FUNCS(inode_block_group, struct btrfs_inode_item, block_group, 64);
1606 BTRFS_SETGET_FUNCS(inode_nlink, struct btrfs_inode_item, nlink, 32);
1607 BTRFS_SETGET_FUNCS(inode_uid, struct btrfs_inode_item, uid, 32);
1608 BTRFS_SETGET_FUNCS(inode_gid, struct btrfs_inode_item, gid, 32);
1609 BTRFS_SETGET_FUNCS(inode_mode, struct btrfs_inode_item, mode, 32);
1610 BTRFS_SETGET_FUNCS(inode_rdev, struct btrfs_inode_item, rdev, 64);
1611 BTRFS_SETGET_FUNCS(inode_flags, struct btrfs_inode_item, flags, 64);
1612
1613 BTRFS_SETGET_STACK_FUNCS(stack_inode_generation,
1614                          struct btrfs_inode_item, generation, 64);
1615 BTRFS_SETGET_STACK_FUNCS(stack_inode_sequence,
1616                          struct btrfs_inode_item, sequence, 64);
1617 BTRFS_SETGET_STACK_FUNCS(stack_inode_transid,
1618                          struct btrfs_inode_item, transid, 64);
1619 BTRFS_SETGET_STACK_FUNCS(stack_inode_size,
1620                          struct btrfs_inode_item, size, 64);
1621 BTRFS_SETGET_STACK_FUNCS(stack_inode_nbytes,
1622                          struct btrfs_inode_item, nbytes, 64);
1623 BTRFS_SETGET_STACK_FUNCS(stack_inode_block_group,
1624                          struct btrfs_inode_item, block_group, 64);
1625 BTRFS_SETGET_STACK_FUNCS(stack_inode_nlink,
1626                          struct btrfs_inode_item, nlink, 32);
1627 BTRFS_SETGET_STACK_FUNCS(stack_inode_uid,
1628                          struct btrfs_inode_item, uid, 32);
1629 BTRFS_SETGET_STACK_FUNCS(stack_inode_gid,
1630                          struct btrfs_inode_item, gid, 32);
1631 BTRFS_SETGET_STACK_FUNCS(stack_inode_mode,
1632                          struct btrfs_inode_item, mode, 32);
1633 BTRFS_SETGET_STACK_FUNCS(stack_inode_rdev,
1634                          struct btrfs_inode_item, rdev, 64);
1635 BTRFS_SETGET_STACK_FUNCS(stack_inode_flags,
1636                          struct btrfs_inode_item, flags, 64);
1637
1638 static inline struct btrfs_timespec *
1639 btrfs_inode_atime(struct btrfs_inode_item *inode_item)
1640 {
1641         unsigned long ptr = (unsigned long)inode_item;
1642         ptr += offsetof(struct btrfs_inode_item, atime);
1643         return (struct btrfs_timespec *)ptr;
1644 }
1645
1646 static inline struct btrfs_timespec *
1647 btrfs_inode_mtime(struct btrfs_inode_item *inode_item)
1648 {
1649         unsigned long ptr = (unsigned long)inode_item;
1650         ptr += offsetof(struct btrfs_inode_item, mtime);
1651         return (struct btrfs_timespec *)ptr;
1652 }
1653
1654 static inline struct btrfs_timespec *
1655 btrfs_inode_ctime(struct btrfs_inode_item *inode_item)
1656 {
1657         unsigned long ptr = (unsigned long)inode_item;
1658         ptr += offsetof(struct btrfs_inode_item, ctime);
1659         return (struct btrfs_timespec *)ptr;
1660 }
1661
1662 static inline struct btrfs_timespec *
1663 btrfs_inode_otime(struct btrfs_inode_item *inode_item)
1664 {
1665         unsigned long ptr = (unsigned long)inode_item;
1666         ptr += offsetof(struct btrfs_inode_item, otime);
1667         return (struct btrfs_timespec *)ptr;
1668 }
1669
1670 BTRFS_SETGET_FUNCS(timespec_sec, struct btrfs_timespec, sec, 64);
1671 BTRFS_SETGET_FUNCS(timespec_nsec, struct btrfs_timespec, nsec, 32);
1672 BTRFS_SETGET_STACK_FUNCS(stack_timespec_sec, struct btrfs_timespec,
1673                          sec, 64);
1674 BTRFS_SETGET_STACK_FUNCS(stack_timespec_nsec, struct btrfs_timespec,
1675                          nsec, 32);
1676
1677 /* struct btrfs_dev_extent */
1678 BTRFS_SETGET_FUNCS(dev_extent_chunk_tree, struct btrfs_dev_extent,
1679                    chunk_tree, 64);
1680 BTRFS_SETGET_FUNCS(dev_extent_chunk_objectid, struct btrfs_dev_extent,
1681                    chunk_objectid, 64);
1682 BTRFS_SETGET_FUNCS(dev_extent_chunk_offset, struct btrfs_dev_extent,
1683                    chunk_offset, 64);
1684 BTRFS_SETGET_FUNCS(dev_extent_length, struct btrfs_dev_extent, length, 64);
1685
1686 BTRFS_SETGET_STACK_FUNCS(stack_dev_extent_length, struct btrfs_dev_extent,
1687                          length, 64);
1688
1689 static inline u8 *btrfs_dev_extent_chunk_tree_uuid(struct btrfs_dev_extent *dev)
1690 {
1691         unsigned long ptr = offsetof(struct btrfs_dev_extent, chunk_tree_uuid);
1692         return (u8 *)((unsigned long)dev + ptr);
1693 }
1694
1695
1696 /* struct btrfs_extent_item */
1697 BTRFS_SETGET_FUNCS(extent_refs, struct btrfs_extent_item, refs, 64);
1698 BTRFS_SETGET_STACK_FUNCS(stack_extent_refs, struct btrfs_extent_item, refs, 64);
1699 BTRFS_SETGET_FUNCS(extent_generation, struct btrfs_extent_item,
1700                    generation, 64);
1701 BTRFS_SETGET_FUNCS(extent_flags, struct btrfs_extent_item, flags, 64);
1702 BTRFS_SETGET_STACK_FUNCS(stack_extent_flags, struct btrfs_extent_item, flags, 64);
1703
1704 BTRFS_SETGET_FUNCS(extent_refs_v0, struct btrfs_extent_item_v0, refs, 32);
1705
1706 BTRFS_SETGET_FUNCS(tree_block_level, struct btrfs_tree_block_info, level, 8);
1707
1708 static inline void btrfs_tree_block_key(struct extent_buffer *eb,
1709                                         struct btrfs_tree_block_info *item,
1710                                         struct btrfs_disk_key *key)
1711 {
1712         read_eb_member(eb, item, struct btrfs_tree_block_info, key, key);
1713 }
1714
1715 static inline void btrfs_set_tree_block_key(struct extent_buffer *eb,
1716                                             struct btrfs_tree_block_info *item,
1717                                             struct btrfs_disk_key *key)
1718 {
1719         write_eb_member(eb, item, struct btrfs_tree_block_info, key, key);
1720 }
1721
1722 BTRFS_SETGET_FUNCS(extent_data_ref_root, struct btrfs_extent_data_ref,
1723                    root, 64);
1724 BTRFS_SETGET_FUNCS(extent_data_ref_objectid, struct btrfs_extent_data_ref,
1725                    objectid, 64);
1726 BTRFS_SETGET_FUNCS(extent_data_ref_offset, struct btrfs_extent_data_ref,
1727                    offset, 64);
1728 BTRFS_SETGET_FUNCS(extent_data_ref_count, struct btrfs_extent_data_ref,
1729                    count, 32);
1730
1731 BTRFS_SETGET_FUNCS(shared_data_ref_count, struct btrfs_shared_data_ref,
1732                    count, 32);
1733
1734 BTRFS_SETGET_FUNCS(extent_inline_ref_type, struct btrfs_extent_inline_ref,
1735                    type, 8);
1736 BTRFS_SETGET_FUNCS(extent_inline_ref_offset, struct btrfs_extent_inline_ref,
1737                    offset, 64);
1738 BTRFS_SETGET_STACK_FUNCS(stack_extent_inline_ref_type,
1739                          struct btrfs_extent_inline_ref, type, 8);
1740 BTRFS_SETGET_STACK_FUNCS(stack_extent_inline_ref_offset,
1741                          struct btrfs_extent_inline_ref, offset, 64);
1742
1743 static inline u32 btrfs_extent_inline_ref_size(int type)
1744 {
1745         if (type == BTRFS_TREE_BLOCK_REF_KEY ||
1746             type == BTRFS_SHARED_BLOCK_REF_KEY)
1747                 return sizeof(struct btrfs_extent_inline_ref);
1748         if (type == BTRFS_SHARED_DATA_REF_KEY)
1749                 return sizeof(struct btrfs_shared_data_ref) +
1750                        sizeof(struct btrfs_extent_inline_ref);
1751         if (type == BTRFS_EXTENT_DATA_REF_KEY)
1752                 return sizeof(struct btrfs_extent_data_ref) +
1753                        offsetof(struct btrfs_extent_inline_ref, offset);
1754         BUG();
1755         return 0;
1756 }
1757
1758 BTRFS_SETGET_FUNCS(ref_root_v0, struct btrfs_extent_ref_v0, root, 64);
1759 BTRFS_SETGET_FUNCS(ref_generation_v0, struct btrfs_extent_ref_v0,
1760                    generation, 64);
1761 BTRFS_SETGET_FUNCS(ref_objectid_v0, struct btrfs_extent_ref_v0, objectid, 64);
1762 BTRFS_SETGET_FUNCS(ref_count_v0, struct btrfs_extent_ref_v0, count, 32);
1763
1764 /* struct btrfs_node */
1765 BTRFS_SETGET_FUNCS(key_blockptr, struct btrfs_key_ptr, blockptr, 64);
1766 BTRFS_SETGET_FUNCS(key_generation, struct btrfs_key_ptr, generation, 64);
1767
1768 static inline u64 btrfs_node_blockptr(struct extent_buffer *eb, int nr)
1769 {
1770         unsigned long ptr;
1771         ptr = offsetof(struct btrfs_node, ptrs) +
1772                 sizeof(struct btrfs_key_ptr) * nr;
1773         return btrfs_key_blockptr(eb, (struct btrfs_key_ptr *)ptr);
1774 }
1775
1776 static inline void btrfs_set_node_blockptr(struct extent_buffer *eb,
1777                                            int nr, u64 val)
1778 {
1779         unsigned long ptr;
1780         ptr = offsetof(struct btrfs_node, ptrs) +
1781                 sizeof(struct btrfs_key_ptr) * nr;
1782         btrfs_set_key_blockptr(eb, (struct btrfs_key_ptr *)ptr, val);
1783 }
1784
1785 static inline u64 btrfs_node_ptr_generation(struct extent_buffer *eb, int nr)
1786 {
1787         unsigned long ptr;
1788         ptr = offsetof(struct btrfs_node, ptrs) +
1789                 sizeof(struct btrfs_key_ptr) * nr;
1790         return btrfs_key_generation(eb, (struct btrfs_key_ptr *)ptr);
1791 }
1792
1793 static inline void btrfs_set_node_ptr_generation(struct extent_buffer *eb,
1794                                                  int nr, u64 val)
1795 {
1796         unsigned long ptr;
1797         ptr = offsetof(struct btrfs_node, ptrs) +
1798                 sizeof(struct btrfs_key_ptr) * nr;
1799         btrfs_set_key_generation(eb, (struct btrfs_key_ptr *)ptr, val);
1800 }
1801
1802 static inline unsigned long btrfs_node_key_ptr_offset(int nr)
1803 {
1804         return offsetof(struct btrfs_node, ptrs) +
1805                 sizeof(struct btrfs_key_ptr) * nr;
1806 }
1807
1808 static inline void btrfs_node_key(struct extent_buffer *eb,
1809                                   struct btrfs_disk_key *disk_key, int nr)
1810 {
1811         unsigned long ptr;
1812         ptr = btrfs_node_key_ptr_offset(nr);
1813         read_eb_member(eb, (struct btrfs_key_ptr *)ptr,
1814                        struct btrfs_key_ptr, key, disk_key);
1815 }
1816
1817 static inline void btrfs_set_node_key(struct extent_buffer *eb,
1818                                       struct btrfs_disk_key *disk_key, int nr)
1819 {
1820         unsigned long ptr;
1821         ptr = btrfs_node_key_ptr_offset(nr);
1822         write_eb_member(eb, (struct btrfs_key_ptr *)ptr,
1823                        struct btrfs_key_ptr, key, disk_key);
1824 }
1825
1826 /* struct btrfs_item */
1827 BTRFS_SETGET_FUNCS(item_offset, struct btrfs_item, offset, 32);
1828 BTRFS_SETGET_FUNCS(item_size, struct btrfs_item, size, 32);
1829
1830 static inline unsigned long btrfs_item_nr_offset(int nr)
1831 {
1832         return offsetof(struct btrfs_leaf, items) +
1833                 sizeof(struct btrfs_item) * nr;
1834 }
1835
1836 static inline struct btrfs_item *btrfs_item_nr(int nr)
1837 {
1838         return (struct btrfs_item *)btrfs_item_nr_offset(nr);
1839 }
1840
1841 static inline u32 btrfs_item_end(struct extent_buffer *eb,
1842                                  struct btrfs_item *item)
1843 {
1844         return btrfs_item_offset(eb, item) + btrfs_item_size(eb, item);
1845 }
1846
1847 static inline u32 btrfs_item_end_nr(struct extent_buffer *eb, int nr)
1848 {
1849         return btrfs_item_end(eb, btrfs_item_nr(nr));
1850 }
1851
1852 static inline u32 btrfs_item_offset_nr(struct extent_buffer *eb, int nr)
1853 {
1854         return btrfs_item_offset(eb, btrfs_item_nr(nr));
1855 }
1856
1857 static inline u32 btrfs_item_size_nr(struct extent_buffer *eb, int nr)
1858 {
1859         return btrfs_item_size(eb, btrfs_item_nr(nr));
1860 }
1861
1862 static inline void btrfs_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         read_eb_member(eb, item, struct btrfs_item, key, disk_key);
1867 }
1868
1869 static inline void btrfs_set_item_key(struct extent_buffer *eb,
1870                                struct btrfs_disk_key *disk_key, int nr)
1871 {
1872         struct btrfs_item *item = btrfs_item_nr(nr);
1873         write_eb_member(eb, item, struct btrfs_item, key, disk_key);
1874 }
1875
1876 BTRFS_SETGET_FUNCS(dir_log_end, struct btrfs_dir_log_item, end, 64);
1877
1878 /*
1879  * struct btrfs_root_ref
1880  */
1881 BTRFS_SETGET_FUNCS(root_ref_dirid, struct btrfs_root_ref, dirid, 64);
1882 BTRFS_SETGET_FUNCS(root_ref_sequence, struct btrfs_root_ref, sequence, 64);
1883 BTRFS_SETGET_FUNCS(root_ref_name_len, struct btrfs_root_ref, name_len, 16);
1884
1885 BTRFS_SETGET_STACK_FUNCS(stack_root_ref_dirid, struct btrfs_root_ref, dirid, 64);
1886 BTRFS_SETGET_STACK_FUNCS(stack_root_ref_sequence, struct btrfs_root_ref, sequence, 64);
1887 BTRFS_SETGET_STACK_FUNCS(stack_root_ref_name_len, struct btrfs_root_ref, name_len, 16);
1888
1889 /* struct btrfs_dir_item */
1890 BTRFS_SETGET_FUNCS(dir_data_len, struct btrfs_dir_item, data_len, 16);
1891 BTRFS_SETGET_FUNCS(dir_type, struct btrfs_dir_item, type, 8);
1892 BTRFS_SETGET_FUNCS(dir_name_len, struct btrfs_dir_item, name_len, 16);
1893 BTRFS_SETGET_FUNCS(dir_transid, struct btrfs_dir_item, transid, 64);
1894
1895 BTRFS_SETGET_STACK_FUNCS(stack_dir_data_len, struct btrfs_dir_item, data_len, 16);
1896 BTRFS_SETGET_STACK_FUNCS(stack_dir_type, struct btrfs_dir_item, type, 8);
1897 BTRFS_SETGET_STACK_FUNCS(stack_dir_name_len, struct btrfs_dir_item, name_len, 16);
1898 BTRFS_SETGET_STACK_FUNCS(stack_dir_transid, struct btrfs_dir_item, transid, 64);
1899
1900 static inline void btrfs_dir_item_key(struct extent_buffer *eb,
1901                                       struct btrfs_dir_item *item,
1902                                       struct btrfs_disk_key *key)
1903 {
1904         read_eb_member(eb, item, struct btrfs_dir_item, location, key);
1905 }
1906
1907 static inline void btrfs_set_dir_item_key(struct extent_buffer *eb,
1908                                           struct btrfs_dir_item *item,
1909                                           struct btrfs_disk_key *key)
1910 {
1911         write_eb_member(eb, item, struct btrfs_dir_item, location, key);
1912 }
1913
1914 /* struct btrfs_free_space_header */
1915 BTRFS_SETGET_FUNCS(free_space_entries, struct btrfs_free_space_header,
1916                    num_entries, 64);
1917 BTRFS_SETGET_FUNCS(free_space_bitmaps, struct btrfs_free_space_header,
1918                    num_bitmaps, 64);
1919 BTRFS_SETGET_FUNCS(free_space_generation, struct btrfs_free_space_header,
1920                    generation, 64);
1921
1922 static inline void btrfs_free_space_key(struct extent_buffer *eb,
1923                                         struct btrfs_free_space_header *h,
1924                                         struct btrfs_disk_key *key)
1925 {
1926         read_eb_member(eb, h, struct btrfs_free_space_header, location, key);
1927 }
1928
1929 static inline void btrfs_set_free_space_key(struct extent_buffer *eb,
1930                                             struct btrfs_free_space_header *h,
1931                                             struct btrfs_disk_key *key)
1932 {
1933         write_eb_member(eb, h, struct btrfs_free_space_header, location, key);
1934 }
1935
1936 /* struct btrfs_disk_key */
1937 BTRFS_SETGET_STACK_FUNCS(disk_key_objectid, struct btrfs_disk_key,
1938                          objectid, 64);
1939 BTRFS_SETGET_STACK_FUNCS(disk_key_offset, struct btrfs_disk_key, offset, 64);
1940 BTRFS_SETGET_STACK_FUNCS(disk_key_type, struct btrfs_disk_key, type, 8);
1941
1942 static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu,
1943                                          struct btrfs_disk_key *disk)
1944 {
1945         cpu->offset = le64_to_cpu(disk->offset);
1946         cpu->type = disk->type;
1947         cpu->objectid = le64_to_cpu(disk->objectid);
1948 }
1949
1950 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk,
1951                                          struct btrfs_key *cpu)
1952 {
1953         disk->offset = cpu_to_le64(cpu->offset);
1954         disk->type = cpu->type;
1955         disk->objectid = cpu_to_le64(cpu->objectid);
1956 }
1957
1958 static inline void btrfs_node_key_to_cpu(struct extent_buffer *eb,
1959                                   struct btrfs_key *key, int nr)
1960 {
1961         struct btrfs_disk_key disk_key;
1962         btrfs_node_key(eb, &disk_key, nr);
1963         btrfs_disk_key_to_cpu(key, &disk_key);
1964 }
1965
1966 static inline void btrfs_item_key_to_cpu(struct extent_buffer *eb,
1967                                   struct btrfs_key *key, int nr)
1968 {
1969         struct btrfs_disk_key disk_key;
1970         btrfs_item_key(eb, &disk_key, nr);
1971         btrfs_disk_key_to_cpu(key, &disk_key);
1972 }
1973
1974 static inline void btrfs_dir_item_key_to_cpu(struct extent_buffer *eb,
1975                                       struct btrfs_dir_item *item,
1976                                       struct btrfs_key *key)
1977 {
1978         struct btrfs_disk_key disk_key;
1979         btrfs_dir_item_key(eb, item, &disk_key);
1980         btrfs_disk_key_to_cpu(key, &disk_key);
1981 }
1982
1983 /* struct btrfs_header */
1984 BTRFS_SETGET_HEADER_FUNCS(header_bytenr, struct btrfs_header, bytenr, 64);
1985 BTRFS_SETGET_HEADER_FUNCS(header_generation, struct btrfs_header,
1986                           generation, 64);
1987 BTRFS_SETGET_HEADER_FUNCS(header_owner, struct btrfs_header, owner, 64);
1988 BTRFS_SETGET_HEADER_FUNCS(header_nritems, struct btrfs_header, nritems, 32);
1989 BTRFS_SETGET_HEADER_FUNCS(header_flags, struct btrfs_header, flags, 64);
1990 BTRFS_SETGET_HEADER_FUNCS(header_level, struct btrfs_header, level, 8);
1991 BTRFS_SETGET_STACK_FUNCS(stack_header_bytenr, struct btrfs_header, bytenr, 64);
1992 BTRFS_SETGET_STACK_FUNCS(stack_header_nritems, struct btrfs_header, nritems,
1993                          32);
1994 BTRFS_SETGET_STACK_FUNCS(stack_header_owner, struct btrfs_header, owner, 64);
1995 BTRFS_SETGET_STACK_FUNCS(stack_header_generation, struct btrfs_header,
1996                          generation, 64);
1997
1998 static inline int btrfs_header_flag(struct extent_buffer *eb, u64 flag)
1999 {
2000         return (btrfs_header_flags(eb) & flag) == flag;
2001 }
2002
2003 static inline int btrfs_set_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_clear_header_flag(struct extent_buffer *eb, u64 flag)
2011 {
2012         u64 flags = btrfs_header_flags(eb);
2013         btrfs_set_header_flags(eb, flags & ~flag);
2014         return (flags & flag) == flag;
2015 }
2016
2017 static inline int btrfs_header_backref_rev(struct extent_buffer *eb)
2018 {
2019         u64 flags = btrfs_header_flags(eb);
2020         return flags >> BTRFS_BACKREF_REV_SHIFT;
2021 }
2022
2023 static inline void btrfs_set_header_backref_rev(struct extent_buffer *eb,
2024                                                 int rev)
2025 {
2026         u64 flags = btrfs_header_flags(eb);
2027         flags &= ~BTRFS_BACKREF_REV_MASK;
2028         flags |= (u64)rev << BTRFS_BACKREF_REV_SHIFT;
2029         btrfs_set_header_flags(eb, flags);
2030 }
2031
2032 static inline unsigned long btrfs_header_fsid(void)
2033 {
2034         return offsetof(struct btrfs_header, fsid);
2035 }
2036
2037 static inline unsigned long btrfs_header_chunk_tree_uuid(struct extent_buffer *eb)
2038 {
2039         return offsetof(struct btrfs_header, chunk_tree_uuid);
2040 }
2041
2042 static inline u8 *btrfs_header_csum(struct extent_buffer *eb)
2043 {
2044         unsigned long ptr = offsetof(struct btrfs_header, csum);
2045         return (u8 *)ptr;
2046 }
2047
2048 static inline int btrfs_is_leaf(struct extent_buffer *eb)
2049 {
2050         return (btrfs_header_level(eb) == 0);
2051 }
2052
2053 /* struct btrfs_root_item */
2054 BTRFS_SETGET_FUNCS(disk_root_generation, struct btrfs_root_item,
2055                    generation, 64);
2056 BTRFS_SETGET_FUNCS(disk_root_refs, struct btrfs_root_item, refs, 32);
2057 BTRFS_SETGET_FUNCS(disk_root_bytenr, struct btrfs_root_item, bytenr, 64);
2058 BTRFS_SETGET_FUNCS(disk_root_level, struct btrfs_root_item, level, 8);
2059
2060 BTRFS_SETGET_STACK_FUNCS(root_generation, struct btrfs_root_item,
2061                          generation, 64);
2062 BTRFS_SETGET_STACK_FUNCS(root_bytenr, struct btrfs_root_item, bytenr, 64);
2063 BTRFS_SETGET_STACK_FUNCS(root_level, struct btrfs_root_item, level, 8);
2064 BTRFS_SETGET_STACK_FUNCS(root_dirid, struct btrfs_root_item, root_dirid, 64);
2065 BTRFS_SETGET_STACK_FUNCS(root_refs, struct btrfs_root_item, refs, 32);
2066 BTRFS_SETGET_STACK_FUNCS(root_flags, struct btrfs_root_item, flags, 64);
2067 BTRFS_SETGET_STACK_FUNCS(root_used, struct btrfs_root_item, bytes_used, 64);
2068 BTRFS_SETGET_STACK_FUNCS(root_limit, struct btrfs_root_item, byte_limit, 64);
2069 BTRFS_SETGET_STACK_FUNCS(root_last_snapshot, struct btrfs_root_item,
2070                          last_snapshot, 64);
2071 BTRFS_SETGET_STACK_FUNCS(root_generation_v2, struct btrfs_root_item,
2072                          generation_v2, 64);
2073 BTRFS_SETGET_STACK_FUNCS(root_ctransid, struct btrfs_root_item,
2074                          ctransid, 64);
2075 BTRFS_SETGET_STACK_FUNCS(root_otransid, struct btrfs_root_item,
2076                          otransid, 64);
2077 BTRFS_SETGET_STACK_FUNCS(root_stransid, struct btrfs_root_item,
2078                          stransid, 64);
2079 BTRFS_SETGET_STACK_FUNCS(root_rtransid, struct btrfs_root_item,
2080                          rtransid, 64);
2081
2082 /* struct btrfs_root_backup */
2083 BTRFS_SETGET_STACK_FUNCS(backup_tree_root, struct btrfs_root_backup,
2084                    tree_root, 64);
2085 BTRFS_SETGET_STACK_FUNCS(backup_tree_root_gen, struct btrfs_root_backup,
2086                    tree_root_gen, 64);
2087 BTRFS_SETGET_STACK_FUNCS(backup_tree_root_level, struct btrfs_root_backup,
2088                    tree_root_level, 8);
2089
2090 BTRFS_SETGET_STACK_FUNCS(backup_chunk_root, struct btrfs_root_backup,
2091                    chunk_root, 64);
2092 BTRFS_SETGET_STACK_FUNCS(backup_chunk_root_gen, struct btrfs_root_backup,
2093                    chunk_root_gen, 64);
2094 BTRFS_SETGET_STACK_FUNCS(backup_chunk_root_level, struct btrfs_root_backup,
2095                    chunk_root_level, 8);
2096
2097 BTRFS_SETGET_STACK_FUNCS(backup_extent_root, struct btrfs_root_backup,
2098                    extent_root, 64);
2099 BTRFS_SETGET_STACK_FUNCS(backup_extent_root_gen, struct btrfs_root_backup,
2100                    extent_root_gen, 64);
2101 BTRFS_SETGET_STACK_FUNCS(backup_extent_root_level, struct btrfs_root_backup,
2102                    extent_root_level, 8);
2103
2104 BTRFS_SETGET_STACK_FUNCS(backup_fs_root, struct btrfs_root_backup,
2105                    fs_root, 64);
2106 BTRFS_SETGET_STACK_FUNCS(backup_fs_root_gen, struct btrfs_root_backup,
2107                    fs_root_gen, 64);
2108 BTRFS_SETGET_STACK_FUNCS(backup_fs_root_level, struct btrfs_root_backup,
2109                    fs_root_level, 8);
2110
2111 BTRFS_SETGET_STACK_FUNCS(backup_dev_root, struct btrfs_root_backup,
2112                    dev_root, 64);
2113 BTRFS_SETGET_STACK_FUNCS(backup_dev_root_gen, struct btrfs_root_backup,
2114                    dev_root_gen, 64);
2115 BTRFS_SETGET_STACK_FUNCS(backup_dev_root_level, struct btrfs_root_backup,
2116                    dev_root_level, 8);
2117
2118 BTRFS_SETGET_STACK_FUNCS(backup_csum_root, struct btrfs_root_backup,
2119                    csum_root, 64);
2120 BTRFS_SETGET_STACK_FUNCS(backup_csum_root_gen, struct btrfs_root_backup,
2121                    csum_root_gen, 64);
2122 BTRFS_SETGET_STACK_FUNCS(backup_csum_root_level, struct btrfs_root_backup,
2123                    csum_root_level, 8);
2124 BTRFS_SETGET_STACK_FUNCS(backup_total_bytes, struct btrfs_root_backup,
2125                    total_bytes, 64);
2126 BTRFS_SETGET_STACK_FUNCS(backup_bytes_used, struct btrfs_root_backup,
2127                    bytes_used, 64);
2128 BTRFS_SETGET_STACK_FUNCS(backup_num_devices, struct btrfs_root_backup,
2129                    num_devices, 64);
2130
2131 /* struct btrfs_super_block */
2132
2133 BTRFS_SETGET_STACK_FUNCS(super_bytenr, struct btrfs_super_block, bytenr, 64);
2134 BTRFS_SETGET_STACK_FUNCS(super_flags, struct btrfs_super_block, flags, 64);
2135 BTRFS_SETGET_STACK_FUNCS(super_generation, struct btrfs_super_block,
2136                          generation, 64);
2137 BTRFS_SETGET_STACK_FUNCS(super_root, struct btrfs_super_block, root, 64);
2138 BTRFS_SETGET_STACK_FUNCS(super_sys_array_size,
2139                          struct btrfs_super_block, sys_chunk_array_size, 32);
2140 BTRFS_SETGET_STACK_FUNCS(super_chunk_root_generation,
2141                          struct btrfs_super_block, chunk_root_generation, 64);
2142 BTRFS_SETGET_STACK_FUNCS(super_root_level, struct btrfs_super_block,
2143                          root_level, 8);
2144 BTRFS_SETGET_STACK_FUNCS(super_chunk_root, struct btrfs_super_block,
2145                          chunk_root, 64);
2146 BTRFS_SETGET_STACK_FUNCS(super_chunk_root_level, struct btrfs_super_block,
2147                          chunk_root_level, 8);
2148 BTRFS_SETGET_STACK_FUNCS(super_log_root, struct btrfs_super_block,
2149                          log_root, 64);
2150 BTRFS_SETGET_STACK_FUNCS(super_log_root_transid, struct btrfs_super_block,
2151                          log_root_transid, 64);
2152 BTRFS_SETGET_STACK_FUNCS(super_log_root_level, struct btrfs_super_block,
2153                          log_root_level, 8);
2154 BTRFS_SETGET_STACK_FUNCS(super_total_bytes, struct btrfs_super_block,
2155                          total_bytes, 64);
2156 BTRFS_SETGET_STACK_FUNCS(super_bytes_used, struct btrfs_super_block,
2157                          bytes_used, 64);
2158 BTRFS_SETGET_STACK_FUNCS(super_sectorsize, struct btrfs_super_block,
2159                          sectorsize, 32);
2160 BTRFS_SETGET_STACK_FUNCS(super_nodesize, struct btrfs_super_block,
2161                          nodesize, 32);
2162 BTRFS_SETGET_STACK_FUNCS(super_leafsize, struct btrfs_super_block,
2163                          leafsize, 32);
2164 BTRFS_SETGET_STACK_FUNCS(super_stripesize, struct btrfs_super_block,
2165                          stripesize, 32);
2166 BTRFS_SETGET_STACK_FUNCS(super_root_dir, struct btrfs_super_block,
2167                          root_dir_objectid, 64);
2168 BTRFS_SETGET_STACK_FUNCS(super_num_devices, struct btrfs_super_block,
2169                          num_devices, 64);
2170 BTRFS_SETGET_STACK_FUNCS(super_compat_flags, struct btrfs_super_block,
2171                          compat_flags, 64);
2172 BTRFS_SETGET_STACK_FUNCS(super_compat_ro_flags, struct btrfs_super_block,
2173                          compat_ro_flags, 64);
2174 BTRFS_SETGET_STACK_FUNCS(super_incompat_flags, struct btrfs_super_block,
2175                          incompat_flags, 64);
2176 BTRFS_SETGET_STACK_FUNCS(super_csum_type, struct btrfs_super_block,
2177                          csum_type, 16);
2178 BTRFS_SETGET_STACK_FUNCS(super_cache_generation, struct btrfs_super_block,
2179                          cache_generation, 64);
2180 BTRFS_SETGET_STACK_FUNCS(super_uuid_tree_generation, struct btrfs_super_block,
2181                          uuid_tree_generation, 64);
2182 BTRFS_SETGET_STACK_FUNCS(super_magic, struct btrfs_super_block, magic, 64);
2183
2184 static inline int btrfs_super_csum_size(struct btrfs_super_block *s)
2185 {
2186         int t = btrfs_super_csum_type(s);
2187         BUG_ON(t >= ARRAY_SIZE(btrfs_csum_sizes));
2188         return btrfs_csum_sizes[t];
2189 }
2190
2191 static inline unsigned long btrfs_leaf_data(struct extent_buffer *l)
2192 {
2193         return offsetof(struct btrfs_leaf, items);
2194 }
2195
2196 /* struct btrfs_file_extent_item */
2197 BTRFS_SETGET_FUNCS(file_extent_type, struct btrfs_file_extent_item, type, 8);
2198 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_type, struct btrfs_file_extent_item, type, 8);
2199
2200 static inline unsigned long btrfs_file_extent_inline_start(struct
2201                                                    btrfs_file_extent_item *e)
2202 {
2203         unsigned long offset = (unsigned long)e;
2204         offset += offsetof(struct btrfs_file_extent_item, disk_bytenr);
2205         return offset;
2206 }
2207
2208 static inline u32 btrfs_file_extent_calc_inline_size(u32 datasize)
2209 {
2210         return offsetof(struct btrfs_file_extent_item, disk_bytenr) + datasize;
2211 }
2212
2213 BTRFS_SETGET_FUNCS(file_extent_disk_bytenr, struct btrfs_file_extent_item,
2214                    disk_bytenr, 64);
2215 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_disk_bytenr, struct btrfs_file_extent_item,
2216                    disk_bytenr, 64);
2217 BTRFS_SETGET_FUNCS(file_extent_generation, struct btrfs_file_extent_item,
2218                    generation, 64);
2219 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_generation, struct btrfs_file_extent_item,
2220                    generation, 64);
2221 BTRFS_SETGET_FUNCS(file_extent_disk_num_bytes, struct btrfs_file_extent_item,
2222                    disk_num_bytes, 64);
2223 BTRFS_SETGET_FUNCS(file_extent_offset, struct btrfs_file_extent_item,
2224                   offset, 64);
2225 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_offset, struct btrfs_file_extent_item,
2226                   offset, 64);
2227 BTRFS_SETGET_FUNCS(file_extent_num_bytes, struct btrfs_file_extent_item,
2228                    num_bytes, 64);
2229 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_num_bytes, struct btrfs_file_extent_item,
2230                    num_bytes, 64);
2231 BTRFS_SETGET_FUNCS(file_extent_ram_bytes, struct btrfs_file_extent_item,
2232                    ram_bytes, 64);
2233 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_ram_bytes, struct btrfs_file_extent_item,
2234                    ram_bytes, 64);
2235 BTRFS_SETGET_FUNCS(file_extent_compression, struct btrfs_file_extent_item,
2236                    compression, 8);
2237 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_compression, struct btrfs_file_extent_item,
2238                    compression, 8);
2239 BTRFS_SETGET_FUNCS(file_extent_encryption, struct btrfs_file_extent_item,
2240                    encryption, 8);
2241 BTRFS_SETGET_FUNCS(file_extent_other_encoding, struct btrfs_file_extent_item,
2242                    other_encoding, 16);
2243
2244 /* btrfs_qgroup_status_item */
2245 BTRFS_SETGET_FUNCS(qgroup_status_version, struct btrfs_qgroup_status_item,
2246                    version, 64);
2247 BTRFS_SETGET_FUNCS(qgroup_status_generation, struct btrfs_qgroup_status_item,
2248                    generation, 64);
2249 BTRFS_SETGET_FUNCS(qgroup_status_flags, struct btrfs_qgroup_status_item,
2250                    flags, 64);
2251 BTRFS_SETGET_FUNCS(qgroup_status_rescan, struct btrfs_qgroup_status_item,
2252                    rescan, 64);
2253
2254 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_status_version,
2255                          struct btrfs_qgroup_status_item, version, 64);
2256 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_status_generation,
2257                          struct btrfs_qgroup_status_item, generation, 64);
2258 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_status_flags,
2259                          struct btrfs_qgroup_status_item, flags, 64);
2260 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_status_rescan,
2261                          struct btrfs_qgroup_status_item, rescan, 64);
2262
2263 /* btrfs_qgroup_info_item */
2264 BTRFS_SETGET_FUNCS(qgroup_info_generation, struct btrfs_qgroup_info_item,
2265                    generation, 64);
2266 BTRFS_SETGET_FUNCS(qgroup_info_referenced, struct btrfs_qgroup_info_item,
2267                    referenced, 64);
2268 BTRFS_SETGET_FUNCS(qgroup_info_referenced_compressed,
2269                    struct btrfs_qgroup_info_item, referenced_compressed, 64);
2270 BTRFS_SETGET_FUNCS(qgroup_info_exclusive, struct btrfs_qgroup_info_item,
2271                    exclusive, 64);
2272 BTRFS_SETGET_FUNCS(qgroup_info_exclusive_compressed,
2273                    struct btrfs_qgroup_info_item, exclusive_compressed, 64);
2274
2275 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_generation,
2276                          struct btrfs_qgroup_info_item, generation, 64);
2277 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_referenced,
2278                          struct btrfs_qgroup_info_item, referenced, 64);
2279 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_referenced_compressed,
2280                    struct btrfs_qgroup_info_item, referenced_compressed, 64);
2281 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_exclusive,
2282                          struct btrfs_qgroup_info_item, exclusive, 64);
2283 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_exclusive_compressed,
2284                    struct btrfs_qgroup_info_item, exclusive_compressed, 64);
2285
2286 /* btrfs_qgroup_limit_item */
2287 BTRFS_SETGET_FUNCS(qgroup_limit_flags, struct btrfs_qgroup_limit_item,
2288                    flags, 64);
2289 BTRFS_SETGET_FUNCS(qgroup_limit_max_referenced, struct btrfs_qgroup_limit_item,
2290                    max_referenced, 64);
2291 BTRFS_SETGET_FUNCS(qgroup_limit_max_exclusive, struct btrfs_qgroup_limit_item,
2292                    max_exclusive, 64);
2293 BTRFS_SETGET_FUNCS(qgroup_limit_rsv_referenced, struct btrfs_qgroup_limit_item,
2294                    rsv_referenced, 64);
2295 BTRFS_SETGET_FUNCS(qgroup_limit_rsv_exclusive, struct btrfs_qgroup_limit_item,
2296                    rsv_exclusive, 64);
2297
2298 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_limit_flags,
2299                          struct btrfs_qgroup_limit_item, flags, 64);
2300 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_limit_max_referenced,
2301                          struct btrfs_qgroup_limit_item, max_referenced, 64);
2302 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_limit_max_exclusive,
2303                          struct btrfs_qgroup_limit_item, max_exclusive, 64);
2304 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_limit_rsv_referenced,
2305                          struct btrfs_qgroup_limit_item, rsv_referenced, 64);
2306 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_limit_rsv_exclusive,
2307                          struct btrfs_qgroup_limit_item, rsv_exclusive, 64);
2308
2309 /* btrfs_balance_item */
2310 BTRFS_SETGET_FUNCS(balance_item_flags, struct btrfs_balance_item, flags, 64);
2311
2312 static inline struct btrfs_disk_balance_args* btrfs_balance_item_data(
2313                 struct extent_buffer *eb, struct btrfs_balance_item *bi)
2314 {
2315         unsigned long offset = (unsigned long)bi;
2316         struct btrfs_balance_item *p;
2317         p = (struct btrfs_balance_item *)(eb->data + offset);
2318         return &p->data;
2319 }
2320
2321 static inline struct btrfs_disk_balance_args* btrfs_balance_item_meta(
2322                 struct extent_buffer *eb, struct btrfs_balance_item *bi)
2323 {
2324         unsigned long offset = (unsigned long)bi;
2325         struct btrfs_balance_item *p;
2326         p = (struct btrfs_balance_item *)(eb->data + offset);
2327         return &p->meta;
2328 }
2329
2330 static inline struct btrfs_disk_balance_args* btrfs_balance_item_sys(
2331                 struct extent_buffer *eb, struct btrfs_balance_item *bi)
2332 {
2333         unsigned long offset = (unsigned long)bi;
2334         struct btrfs_balance_item *p;
2335         p = (struct btrfs_balance_item *)(eb->data + offset);
2336         return &p->sys;
2337 }
2338
2339 /*
2340  * btrfs_dev_stats_item helper, returns pointer to the raw array, do the
2341  * endiannes conversion, @dsi is offset to eb data
2342  */
2343 static inline __le64* btrfs_dev_stats_values(struct extent_buffer *eb,
2344                 struct btrfs_dev_stats_item *dsi)
2345 {
2346         unsigned long offset = (unsigned long)dsi;
2347         struct btrfs_dev_stats_item *p;
2348         p = (struct btrfs_dev_stats_item *)(eb->data + offset);
2349         return p->values;
2350 }
2351
2352 /*
2353  * this returns the number of bytes used by the item on disk, minus the
2354  * size of any extent headers.  If a file is compressed on disk, this is
2355  * the compressed size
2356  */
2357 static inline u32 btrfs_file_extent_inline_item_len(struct extent_buffer *eb,
2358                                                     struct btrfs_item *e)
2359 {
2360        unsigned long offset;
2361        offset = offsetof(struct btrfs_file_extent_item, disk_bytenr);
2362        return btrfs_item_size(eb, e) - offset;
2363 }
2364
2365 /* struct btrfs_ioctl_search_header */
2366 static inline u64 btrfs_search_header_transid(struct btrfs_ioctl_search_header *sh)
2367 {
2368         return get_unaligned_64(&sh->transid);
2369 }
2370
2371 static inline u64 btrfs_search_header_objectid(struct btrfs_ioctl_search_header *sh)
2372 {
2373         return get_unaligned_64(&sh->objectid);
2374 }
2375
2376 static inline u64 btrfs_search_header_offset(struct btrfs_ioctl_search_header *sh)
2377 {
2378         return get_unaligned_64(&sh->offset);
2379 }
2380
2381 static inline u32 btrfs_search_header_type(struct btrfs_ioctl_search_header *sh)
2382 {
2383         return get_unaligned_32(&sh->type);
2384 }
2385
2386 static inline u32 btrfs_search_header_len(struct btrfs_ioctl_search_header *sh)
2387 {
2388         return get_unaligned_32(&sh->len);
2389 }
2390
2391 /* this returns the number of file bytes represented by the inline item.
2392  * If an item is compressed, this is the uncompressed size
2393  */
2394 static inline u32 btrfs_file_extent_inline_len(struct extent_buffer *eb,
2395                                                int slot,
2396                                                struct btrfs_file_extent_item *fi)
2397 {
2398         /*
2399          * return the space used on disk if this item isn't
2400          * compressed or encoded
2401          */
2402         if (btrfs_file_extent_compression(eb, fi) == 0 &&
2403             btrfs_file_extent_encryption(eb, fi) == 0 &&
2404             btrfs_file_extent_other_encoding(eb, fi) == 0) {
2405                 return btrfs_file_extent_inline_item_len(eb,
2406                                                          btrfs_item_nr(slot));
2407         }
2408
2409         /* otherwise use the ram bytes field */
2410         return btrfs_file_extent_ram_bytes(eb, fi);
2411 }
2412
2413 /*
2414  * NOTE: Backward compatibility, do not use.
2415  * Replacement: read nodesize directly
2416  */
2417 __attribute__((deprecated))
2418 static inline u32 btrfs_level_size(struct btrfs_root *root, int level) {
2419         if (level == 0)
2420                 return root->leafsize;
2421         return root->nodesize;
2422 }
2423
2424 #define btrfs_fs_incompat(fs_info, opt) \
2425         __btrfs_fs_incompat((fs_info), BTRFS_FEATURE_INCOMPAT_##opt)
2426
2427 static inline int __btrfs_fs_incompat(struct btrfs_fs_info *fs_info, u64 flag)
2428 {
2429         struct btrfs_super_block *disk_super;
2430         disk_super = fs_info->super_copy;
2431         return !!(btrfs_super_incompat_flags(disk_super) & flag);
2432 }
2433
2434 #define btrfs_fs_compat_ro(fs_info, opt) \
2435         __btrfs_fs_compat_ro((fs_info), BTRFS_FEATURE_COMPAT_RO_##opt)
2436
2437 static inline int __btrfs_fs_compat_ro(struct btrfs_fs_info *fs_info, u64 flag)
2438 {
2439         struct btrfs_super_block *disk_super;
2440         disk_super = fs_info->super_copy;
2441         return !!(btrfs_super_compat_ro_flags(disk_super) & flag);
2442 }
2443
2444 /* helper function to cast into the data area of the leaf. */
2445 #define btrfs_item_ptr(leaf, slot, type) \
2446         ((type *)(btrfs_leaf_data(leaf) + \
2447         btrfs_item_offset_nr(leaf, slot)))
2448
2449 #define btrfs_item_ptr_offset(leaf, slot) \
2450         ((unsigned long)(btrfs_leaf_data(leaf) + \
2451         btrfs_item_offset_nr(leaf, slot)))
2452
2453 /* extent-tree.c */
2454 int btrfs_reserve_extent(struct btrfs_trans_handle *trans,
2455                          struct btrfs_root *root,
2456                          u64 num_bytes, u64 empty_size,
2457                          u64 hint_byte, u64 search_end,
2458                          struct btrfs_key *ins, int data);
2459 int btrfs_fix_block_accounting(struct btrfs_trans_handle *trans,
2460                                  struct btrfs_root *root);
2461 void btrfs_pin_extent(struct btrfs_fs_info *fs_info, u64 bytenr, u64 num_bytes);
2462 void btrfs_unpin_extent(struct btrfs_fs_info *fs_info,
2463                         u64 bytenr, u64 num_bytes);
2464 int btrfs_extent_post_op(struct btrfs_trans_handle *trans,
2465                          struct btrfs_root *root);
2466 struct btrfs_block_group_cache *btrfs_lookup_block_group(struct
2467                                                          btrfs_fs_info *info,
2468                                                          u64 bytenr);
2469 struct btrfs_block_group_cache *btrfs_lookup_first_block_group(struct
2470                                                        btrfs_fs_info *info,
2471                                                        u64 bytenr);
2472 struct extent_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
2473                                         struct btrfs_root *root,
2474                                         u32 blocksize, u64 root_objectid,
2475                                         struct btrfs_disk_key *key, int level,
2476                                         u64 hint, u64 empty_size);
2477 int btrfs_alloc_extent(struct btrfs_trans_handle *trans,
2478                        struct btrfs_root *root,
2479                        u64 num_bytes, u64 parent,
2480                        u64 root_objectid, u64 ref_generation,
2481                        u64 owner, u64 empty_size, u64 hint_byte,
2482                        u64 search_end, struct btrfs_key *ins, int data);
2483 int btrfs_lookup_extent_info(struct btrfs_trans_handle *trans,
2484                              struct btrfs_root *root, u64 bytenr,
2485                              u64 offset, int metadata, u64 *refs, u64 *flags);
2486 int btrfs_set_block_flags(struct btrfs_trans_handle *trans,
2487                           struct btrfs_root *root,
2488                           u64 bytenr, int level, u64 flags);
2489 int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2490                   struct extent_buffer *buf, int record_parent);
2491 int btrfs_dec_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2492                   struct extent_buffer *buf, int record_parent);
2493 int btrfs_free_tree_block(struct btrfs_trans_handle *trans,
2494                           struct btrfs_root *root,
2495                           struct extent_buffer *buf,
2496                           u64 parent, int last_ref);
2497 int btrfs_free_extent(struct btrfs_trans_handle *trans,
2498                       struct btrfs_root *root,
2499                       u64 bytenr, u64 num_bytes, u64 parent,
2500                       u64 root_objectid, u64 owner, u64 offset);
2501 int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans,
2502                                struct btrfs_root *root,
2503                                struct extent_io_tree *unpin);
2504 int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
2505                                 struct btrfs_root *root,
2506                                 u64 bytenr, u64 num_bytes, u64 parent,
2507                                 u64 root_objectid, u64 ref_generation,
2508                                 u64 owner_objectid);
2509 int btrfs_update_extent_ref(struct btrfs_trans_handle *trans,
2510                             struct btrfs_root *root, u64 bytenr,
2511                             u64 orig_parent, u64 parent,
2512                             u64 root_objectid, u64 ref_generation,
2513                             u64 owner_objectid);
2514 int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans,
2515                                     struct btrfs_root *root);
2516 int btrfs_free_block_groups(struct btrfs_fs_info *info);
2517 int btrfs_read_block_groups(struct btrfs_root *root);
2518 struct btrfs_block_group_cache *
2519 btrfs_add_block_group(struct btrfs_fs_info *fs_info, u64 bytes_used, u64 type,
2520                       u64 chunk_objectid, u64 chunk_offset, u64 size);
2521 int btrfs_make_block_group(struct btrfs_trans_handle *trans,
2522                            struct btrfs_root *root, u64 bytes_used,
2523                            u64 type, u64 chunk_objectid, u64 chunk_offset,
2524                            u64 size);
2525 int btrfs_make_block_groups(struct btrfs_trans_handle *trans,
2526                             struct btrfs_root *root);
2527 int btrfs_update_block_group(struct btrfs_trans_handle *trans,
2528                              struct btrfs_root *root, u64 bytenr, u64 num,
2529                              int alloc, int mark_free);
2530 int btrfs_record_file_extent(struct btrfs_trans_handle *trans,
2531                               struct btrfs_root *root, u64 objectid,
2532                               struct btrfs_inode_item *inode,
2533                               u64 file_pos, u64 disk_bytenr,
2534                               u64 num_bytes);
2535 int btrfs_free_block_group(struct btrfs_trans_handle *trans,
2536                            struct btrfs_fs_info *fs_info, u64 bytenr, u64 len);
2537 void free_excluded_extents(struct btrfs_root *root,
2538                            struct btrfs_block_group_cache *cache);
2539 int exclude_super_stripes(struct btrfs_root *root,
2540                           struct btrfs_block_group_cache *cache);
2541 u64 add_new_free_space(struct btrfs_block_group_cache *block_group,
2542                        struct btrfs_fs_info *info, u64 start, u64 end);
2543 u64 hash_extent_data_ref(u64 root_objectid, u64 owner, u64 offset);
2544
2545 /* ctree.c */
2546 int btrfs_comp_cpu_keys(struct btrfs_key *k1, struct btrfs_key *k2);
2547 int btrfs_del_ptr(struct btrfs_root *root, struct btrfs_path *path,
2548                 int level, int slot);
2549 enum btrfs_tree_block_status
2550 btrfs_check_node(struct btrfs_root *root, struct btrfs_disk_key *parent_key,
2551                  struct extent_buffer *buf);
2552 enum btrfs_tree_block_status
2553 btrfs_check_leaf(struct btrfs_root *root, struct btrfs_disk_key *parent_key,
2554                  struct extent_buffer *buf);
2555 void reada_for_search(struct btrfs_root *root, struct btrfs_path *path,
2556                              int level, int slot, u64 objectid);
2557 struct extent_buffer *read_node_slot(struct btrfs_root *root,
2558                                    struct extent_buffer *parent, int slot);
2559 int btrfs_previous_item(struct btrfs_root *root,
2560                         struct btrfs_path *path, u64 min_objectid,
2561                         int type);
2562 int btrfs_previous_extent_item(struct btrfs_root *root,
2563                         struct btrfs_path *path, u64 min_objectid);
2564 int btrfs_next_extent_item(struct btrfs_root *root,
2565                         struct btrfs_path *path, u64 max_objectid);
2566 int btrfs_cow_block(struct btrfs_trans_handle *trans,
2567                     struct btrfs_root *root, struct extent_buffer *buf,
2568                     struct extent_buffer *parent, int parent_slot,
2569                     struct extent_buffer **cow_ret);
2570 int __btrfs_cow_block(struct btrfs_trans_handle *trans,
2571                              struct btrfs_root *root,
2572                              struct extent_buffer *buf,
2573                              struct extent_buffer *parent, int parent_slot,
2574                              struct extent_buffer **cow_ret,
2575                              u64 search_start, u64 empty_size);
2576 int btrfs_copy_root(struct btrfs_trans_handle *trans,
2577                       struct btrfs_root *root,
2578                       struct extent_buffer *buf,
2579                       struct extent_buffer **cow_ret, u64 new_root_objectid);
2580 int btrfs_extend_item(struct btrfs_root *root, struct btrfs_path *path,
2581                 u32 data_size);
2582 int btrfs_truncate_item(struct btrfs_root *root, struct btrfs_path *path,
2583                         u32 new_size, int from_end);
2584 int btrfs_split_item(struct btrfs_trans_handle *trans,
2585                      struct btrfs_root *root,
2586                      struct btrfs_path *path,
2587                      struct btrfs_key *new_key,
2588                      unsigned long split_offset);
2589 int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root
2590                       *root, struct btrfs_key *key, struct btrfs_path *p, int
2591                       ins_len, int cow);
2592 int btrfs_find_item(struct btrfs_root *fs_root, struct btrfs_path *found_path,
2593                 u64 iobjectid, u64 ioff, u8 key_type,
2594                 struct btrfs_key *found_key);
2595 void btrfs_release_path(struct btrfs_path *p);
2596 void add_root_to_dirty_list(struct btrfs_root *root);
2597 struct btrfs_path *btrfs_alloc_path(void);
2598 void btrfs_free_path(struct btrfs_path *p);
2599 void btrfs_init_path(struct btrfs_path *p);
2600 int btrfs_del_items(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2601                    struct btrfs_path *path, int slot, int nr);
2602
2603 static inline int btrfs_del_item(struct btrfs_trans_handle *trans,
2604                                  struct btrfs_root *root,
2605                                  struct btrfs_path *path)
2606 {
2607         return btrfs_del_items(trans, root, path, path->slots[0], 1);
2608 }
2609
2610 int btrfs_insert_item(struct btrfs_trans_handle *trans, struct btrfs_root
2611                       *root, struct btrfs_key *key, void *data, u32 data_size);
2612 int btrfs_insert_empty_items(struct btrfs_trans_handle *trans,
2613                              struct btrfs_root *root,
2614                              struct btrfs_path *path,
2615                              struct btrfs_key *cpu_key, u32 *data_size, int nr);
2616
2617 static inline int btrfs_insert_empty_item(struct btrfs_trans_handle *trans,
2618                                           struct btrfs_root *root,
2619                                           struct btrfs_path *path,
2620                                           struct btrfs_key *key,
2621                                           u32 data_size)
2622 {
2623         return btrfs_insert_empty_items(trans, root, path, key, &data_size, 1);
2624 }
2625
2626 int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path);
2627 static inline int btrfs_next_item(struct btrfs_root *root,
2628                                   struct btrfs_path *p)
2629 {
2630         ++p->slots[0];
2631         if (p->slots[0] >= btrfs_header_nritems(p->nodes[0]))
2632                 return btrfs_next_leaf(root, p);
2633         return 0;
2634 }
2635
2636 int btrfs_prev_leaf(struct btrfs_root *root, struct btrfs_path *path);
2637 int btrfs_leaf_free_space(struct btrfs_root *root, struct extent_buffer *leaf);
2638 void btrfs_fixup_low_keys(struct btrfs_root *root, struct btrfs_path *path,
2639                           struct btrfs_disk_key *key, int level);
2640 int btrfs_set_item_key_safe(struct btrfs_root *root, struct btrfs_path *path,
2641                             struct btrfs_key *new_key);
2642 void btrfs_set_item_key_unsafe(struct btrfs_root *root,
2643                                struct btrfs_path *path,
2644                                struct btrfs_key *new_key);
2645
2646 /* root-item.c */
2647 int btrfs_add_root_ref(struct btrfs_trans_handle *trans,
2648                        struct btrfs_root *tree_root,
2649                        u64 root_id, u8 type, u64 ref_id,
2650                        u64 dirid, u64 sequence,
2651                        const char *name, int name_len);
2652 int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root
2653                       *root, struct btrfs_key *key, struct btrfs_root_item
2654                       *item);
2655 int btrfs_del_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2656                    struct btrfs_key *key);
2657 int btrfs_update_root(struct btrfs_trans_handle *trans, struct btrfs_root
2658                       *root, struct btrfs_key *key, struct btrfs_root_item
2659                       *item);
2660 int btrfs_find_last_root(struct btrfs_root *root, u64 objectid, struct
2661                          btrfs_root_item *item, struct btrfs_key *key);
2662 /* dir-item.c */
2663 int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
2664                           *root, const char *name, int name_len, u64 dir,
2665                           struct btrfs_key *location, u8 type, u64 index);
2666 struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans,
2667                                              struct btrfs_root *root,
2668                                              struct btrfs_path *path, u64 dir,
2669                                              const char *name, int name_len,
2670                                              int mod);
2671 struct btrfs_dir_item *btrfs_lookup_dir_index(struct btrfs_trans_handle *trans,
2672                                               struct btrfs_root *root,
2673                                               struct btrfs_path *path, u64 dir,
2674                                               const char *name, int name_len,
2675                                               u64 index, int mod);
2676 int btrfs_delete_one_dir_name(struct btrfs_trans_handle *trans,
2677                               struct btrfs_root *root,
2678                               struct btrfs_path *path,
2679                               struct btrfs_dir_item *di);
2680 int btrfs_insert_xattr_item(struct btrfs_trans_handle *trans,
2681                             struct btrfs_root *root, const char *name,
2682                             u16 name_len, const void *data, u16 data_len,
2683                             u64 dir);
2684 /* inode-map.c */
2685 int btrfs_find_free_objectid(struct btrfs_trans_handle *trans,
2686                              struct btrfs_root *fs_root,
2687                              u64 dirid, u64 *objectid);
2688
2689 /* inode-item.c */
2690 int btrfs_insert_inode_ref(struct btrfs_trans_handle *trans,
2691                            struct btrfs_root *root,
2692                            const char *name, int name_len,
2693                            u64 inode_objectid, u64 ref_objectid, u64 index);
2694 int btrfs_insert_inode(struct btrfs_trans_handle *trans, struct btrfs_root
2695                        *root, u64 objectid, struct btrfs_inode_item
2696                        *inode_item);
2697 int btrfs_lookup_inode(struct btrfs_trans_handle *trans, struct btrfs_root
2698                        *root, struct btrfs_path *path,
2699                        struct btrfs_key *location, int mod);
2700 struct btrfs_inode_extref *btrfs_lookup_inode_extref(struct btrfs_trans_handle
2701                 *trans, struct btrfs_path *path, struct btrfs_root *root,
2702                 u64 ino, u64 parent_ino, u64 index, const char *name,
2703                 int namelen, int ins_len);
2704 int btrfs_del_inode_extref(struct btrfs_trans_handle *trans,
2705                            struct btrfs_root *root,
2706                            const char *name, int name_len,
2707                            u64 inode_objectid, u64 ref_objectid,
2708                            u64 *index);
2709 int btrfs_insert_inode_extref(struct btrfs_trans_handle *trans,
2710                               struct btrfs_root *root,
2711                               const char *name, int name_len,
2712                               u64 inode_objectid, u64 ref_objectid, u64 index);
2713 struct btrfs_inode_ref *btrfs_lookup_inode_ref(struct btrfs_trans_handle *trans,
2714                 struct btrfs_root *root, struct btrfs_path *path,
2715                 const char *name, int namelen, u64 ino, u64 parent_ino,
2716                 int ins_len);
2717 int btrfs_del_inode_ref(struct btrfs_trans_handle *trans,
2718                         struct btrfs_root *root, const char *name, int name_len,
2719                         u64 ino, u64 parent_ino, u64 *index);
2720
2721 /* file-item.c */
2722 int btrfs_del_csums(struct btrfs_trans_handle *trans,
2723                     struct btrfs_root *root, u64 bytenr, u64 len);
2724 int btrfs_insert_file_extent(struct btrfs_trans_handle *trans,
2725                              struct btrfs_root *root,
2726                              u64 objectid, u64 pos, u64 offset,
2727                              u64 disk_num_bytes,
2728                              u64 num_bytes);
2729 int btrfs_insert_inline_extent(struct btrfs_trans_handle *trans,
2730                                 struct btrfs_root *root, u64 objectid,
2731                                 u64 offset, char *buffer, size_t size);
2732 int btrfs_csum_file_block(struct btrfs_trans_handle *trans,
2733                           struct btrfs_root *root, u64 alloc_end,
2734                           u64 bytenr, char *data, size_t len);
2735 int btrfs_csum_truncate(struct btrfs_trans_handle *trans,
2736                         struct btrfs_root *root, struct btrfs_path *path,
2737                         u64 isize);
2738
2739 /* uuid-tree.c */
2740 int btrfs_lookup_uuid_subvol_item(int fd, const u8 *uuid, u64 *subvol_id);
2741 int btrfs_lookup_uuid_received_subvol_item(int fd, const u8 *uuid,
2742                                            u64 *subvol_id);
2743
2744 static inline int is_fstree(u64 rootid)
2745 {
2746         if (rootid == BTRFS_FS_TREE_OBJECTID ||
2747             (signed long long)rootid >= (signed long long)BTRFS_FIRST_FREE_OBJECTID)
2748                 return 1;
2749         return 0;
2750 }
2751
2752 /* inode.c */
2753 int check_dir_conflict(struct btrfs_root *root, char *name, int namelen,
2754                 u64 dir, u64 index);
2755 int btrfs_new_inode(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2756                 u64 ino, u32 mode);
2757 int btrfs_change_inode_flags(struct btrfs_trans_handle *trans,
2758                              struct btrfs_root *root, u64 ino, u64 flags);
2759 int btrfs_add_link(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2760                    u64 ino, u64 parent_ino, char *name, int namelen,
2761                    u8 type, u64 *index, int add_backref);
2762 int btrfs_unlink(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2763                  u64 ino, u64 parent_ino, u64 index, const char *name,
2764                  int namelen, int add_orphan);
2765 int btrfs_add_orphan_item(struct btrfs_trans_handle *trans,
2766                           struct btrfs_root *root, struct btrfs_path *path,
2767                           u64 ino);
2768 int btrfs_mkdir(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2769                 char *name, int namelen, u64 parent_ino, u64 *ino, int mode);
2770
2771 /* file.c */
2772 int btrfs_get_extent(struct btrfs_trans_handle *trans,
2773                      struct btrfs_root *root,
2774                      struct btrfs_path *path,
2775                      u64 ino, u64 offset, u64 len, int ins_len);
2776 int btrfs_punch_hole(struct btrfs_trans_handle *trans,
2777                      struct btrfs_root *root,
2778                      u64 ino, u64 offset, u64 len);
2779 int btrfs_read_file(struct btrfs_root *root, u64 ino, u64 start, int len,
2780                     char *dest);
2781
2782 #endif