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 #else
  30 #include <btrfs/list.h>
  31 #include <btrfs/kerncompat.h>
  32 #include <btrfs/radix-tree.h>
  33 #include <btrfs/extent-cache.h>
  34 #include <btrfs/extent_io.h>
  35 #include <btrfs/ioctl.h>
  36 #endif /* BTRFS_FLAT_INCLUDES */
  37
  38 struct btrfs_root;
  39 struct btrfs_trans_handle;
  40 struct btrfs_free_space_ctl;
  41 #define BTRFS_MAGIC 0x4D5F53665248425FULL /* ascii _BHRfS_M, no null */
  42
  43 /*
  44  * Fake signature for an unfinalized filesystem, structures might be partially
  45  * created or missing.
  46  */
  47 #define BTRFS_MAGIC_PARTIAL 0x4D5F536652484221ULL /* ascii !BHRfS_M, no null */
  48
  49 #define BTRFS_MAX_MIRRORS 3
  50
  51 #define BTRFS_MAX_LEVEL 8
  52
  53 #define BTRFS_COMPAT_EXTENT_TREE_V0
  54
  55 /* holds pointers to all of the tree roots */
  56 #define BTRFS_ROOT_TREE_OBJECTID 1ULL
  57
  58 /* stores information about which extents are in use, and reference counts */
  59 #define BTRFS_EXTENT_TREE_OBJECTID 2ULL
  60
  61 /*
  62  * chunk tree stores translations from logical -> physical block numbering
  63  * the super block points to the chunk tree
  64  */
  65 #define BTRFS_CHUNK_TREE_OBJECTID 3ULL
  66
  67 /*
  68  * stores information about which areas of a given device are in use.
  69  * one per device.  The tree of tree roots points to the device tree
  70  */
  71 #define BTRFS_DEV_TREE_OBJECTID 4ULL
  72
  73 /* one per subvolume, storing files and directories */
  74 #define BTRFS_FS_TREE_OBJECTID 5ULL
  75
  76 /* directory objectid inside the root tree */
  77 #define BTRFS_ROOT_TREE_DIR_OBJECTID 6ULL
  78 /* holds checksums of all the data extents */
  79 #define BTRFS_CSUM_TREE_OBJECTID 7ULL
  80 #define BTRFS_QUOTA_TREE_OBJECTID 8ULL
  81
  82 /* for storing items that use the BTRFS_UUID_KEY* */
  83 #define BTRFS_UUID_TREE_OBJECTID 9ULL
  84
  85 /* tracks free space in block groups. */
  86 #define BTRFS_FREE_SPACE_TREE_OBJECTID 10ULL
  87
  88 /* device stats in the device tree */
  89 #define BTRFS_DEV_STATS_OBJECTID 0ULL
  90
  91 /* for storing balance parameters in the root tree */
  92 #define BTRFS_BALANCE_OBJECTID -4ULL
  93
  94 /* oprhan objectid for tracking unlinked/truncated files */
  95 #define BTRFS_ORPHAN_OBJECTID -5ULL
  96
  97 /* does write ahead logging to speed up fsyncs */
  98 #define BTRFS_TREE_LOG_OBJECTID -6ULL
  99 #define BTRFS_TREE_LOG_FIXUP_OBJECTID -7ULL
 100
 101 /* space balancing */
 102 #define BTRFS_TREE_RELOC_OBJECTID -8ULL
 103 #define BTRFS_DATA_RELOC_TREE_OBJECTID -9ULL
 104
 105 /*
 106  * extent checksums all have this objectid
 107  * this allows them to share the logging tree
 108  * for fsyncs
 109  */
 110 #define BTRFS_EXTENT_CSUM_OBJECTID -10ULL
 111
 112 /* For storing free space cache */
 113 #define BTRFS_FREE_SPACE_OBJECTID -11ULL
 114
 115 /*
 116  * The inode number assigned to the special inode for sotring
 117  * free ino cache
 118  */
 119 #define BTRFS_FREE_INO_OBJECTID -12ULL
 120
 121 /* dummy objectid represents multiple objectids */
 122 #define BTRFS_MULTIPLE_OBJECTIDS -255ULL
 123
 124 /*
 125  * All files have objectids in this range.
 126  */
 127 #define BTRFS_FIRST_FREE_OBJECTID 256ULL
 128 #define BTRFS_LAST_FREE_OBJECTID -256ULL
 129 #define BTRFS_FIRST_CHUNK_TREE_OBJECTID 256ULL
 130
 131
 132
 133 /*
 134  * the device items go into the chunk tree.  The key is in the form
 135  * [ 1 BTRFS_DEV_ITEM_KEY device_id ]
 136  */
 137 #define BTRFS_DEV_ITEMS_OBJECTID 1ULL
 138
 139 /*
 140  * the max metadata block size.  This limit is somewhat artificial,
 141  * but the memmove costs go through the roof for larger blocks.
 142  */
 143 #define BTRFS_MAX_METADATA_BLOCKSIZE 65536
 144
 145 /*
 146  * we can actually store much bigger names, but lets not confuse the rest
 147  * of linux
 148  */
 149 #define BTRFS_NAME_LEN 255
 150
 151 /*
 152  * Theoretical limit is larger, but we keep this down to a sane
 153  * value. That should limit greatly the possibility of collisions on
 154  * inode ref items.
 155  */
 156 #define BTRFS_LINK_MAX  65535U
 157
 158 /* 32 bytes in various csum fields */
 159 #define BTRFS_CSUM_SIZE 32
 160
 161 /* csum types */
 162 #define BTRFS_CSUM_TYPE_CRC32   0
 163
 164 static int btrfs_csum_sizes[] = { 4 };
 165
 166 /* four bytes for CRC32 */
 167 #define BTRFS_CRC32_SIZE 4
 168 #define BTRFS_EMPTY_DIR_SIZE 0
 169
 170 #define BTRFS_FT_UNKNOWN        0
 171 #define BTRFS_FT_REG_FILE       1
 172 #define BTRFS_FT_DIR            2
 173 #define BTRFS_FT_CHRDEV         3
 174 #define BTRFS_FT_BLKDEV         4
 175 #define BTRFS_FT_FIFO           5
 176 #define BTRFS_FT_SOCK           6
 177 #define BTRFS_FT_SYMLINK        7
 178 #define BTRFS_FT_XATTR          8
 179 #define BTRFS_FT_MAX            9
 180
 181 #define BTRFS_ROOT_SUBVOL_RDONLY        (1ULL << 0)
 182
 183 /*
 184  * the key defines the order in the tree, and so it also defines (optimal)
 185  * block layout.  objectid corresponds to the inode number.  The flags
 186  * tells us things about the object, and is a kind of stream selector.
 187  * so for a given inode, keys with flags of 1 might refer to the inode
 188  * data, flags of 2 may point to file data in the btree and flags == 3
 189  * may point to extents.
 190  *
 191  * offset is the starting byte offset for this key in the stream.
 192  *
 193  * btrfs_disk_key is in disk byte order.  struct btrfs_key is always
 194  * in cpu native order.  Otherwise they are identical and their sizes
 195  * should be the same (ie both packed)
 196  */
 197 struct btrfs_disk_key {
 198         __le64 objectid;
 199         u8 type;
 200         __le64 offset;
 201 } __attribute__ ((__packed__));
 202
 203 struct btrfs_key {
 204         u64 objectid;
 205         u8 type;
 206         u64 offset;
 207 } __attribute__ ((__packed__));
 208
 209 struct btrfs_mapping_tree {
 210         struct cache_tree cache_tree;
 211 };
 212
 213 #define BTRFS_UUID_SIZE 16
 214 struct btrfs_dev_item {
 215         /* the internal btrfs device id */
 216         __le64 devid;
 217
 218         /* size of the device */
 219         __le64 total_bytes;
 220
 221         /* bytes used */
 222         __le64 bytes_used;
 223
 224         /* optimal io alignment for this device */
 225         __le32 io_align;
 226
 227         /* optimal io width for this device */
 228         __le32 io_width;
 229
 230         /* minimal io size for this device */
 231         __le32 sector_size;
 232
 233         /* type and info about this device */
 234         __le64 type;
 235
 236         /* expected generation for this device */
 237         __le64 generation;
 238
 239         /*
 240          * starting byte of this partition on the device,
 241          * to allow for stripe alignment in the future
 242          */
 243         __le64 start_offset;
 244
 245         /* grouping information for allocation decisions */
 246         __le32 dev_group;
 247
 248         /* seek speed 0-100 where 100 is fastest */
 249         u8 seek_speed;
 250
 251         /* bandwidth 0-100 where 100 is fastest */
 252         u8 bandwidth;
 253
 254         /* btrfs generated uuid for this device */
 255         u8 uuid[BTRFS_UUID_SIZE];
 256
 257         /* uuid of FS who owns this device */
 258         u8 fsid[BTRFS_UUID_SIZE];
 259 } __attribute__ ((__packed__));
 260
 261 struct btrfs_stripe {
 262         __le64 devid;
 263         __le64 offset;
 264         u8 dev_uuid[BTRFS_UUID_SIZE];
 265 } __attribute__ ((__packed__));
 266
 267 struct btrfs_chunk {
 268         /* size of this chunk in bytes */
 269         __le64 length;
 270
 271         /* objectid of the root referencing this chunk */
 272         __le64 owner;
 273
 274         __le64 stripe_len;
 275         __le64 type;
 276
 277         /* optimal io alignment for this chunk */
 278         __le32 io_align;
 279
 280         /* optimal io width for this chunk */
 281         __le32 io_width;
 282
 283         /* minimal io size for this chunk */
 284         __le32 sector_size;
 285
 286         /* 2^16 stripes is quite a lot, a second limit is the size of a single
 287          * item in the btree
 288          */
 289         __le16 num_stripes;
 290
 291         /* sub stripes only matter for raid10 */
 292         __le16 sub_stripes;
 293         struct btrfs_stripe stripe;
 294         /* additional stripes go here */
 295 } __attribute__ ((__packed__));
 296
 297 #define BTRFS_FREE_SPACE_EXTENT 1
 298 #define BTRFS_FREE_SPACE_BITMAP 2
 299
 300 struct btrfs_free_space_entry {
 301         __le64 offset;
 302         __le64 bytes;
 303         u8 type;
 304 } __attribute__ ((__packed__));
 305
 306 struct btrfs_free_space_header {
 307         struct btrfs_disk_key location;
 308         __le64 generation;
 309         __le64 num_entries;
 310         __le64 num_bitmaps;
 311 } __attribute__ ((__packed__));
 312
 313 static inline unsigned long btrfs_chunk_item_size(int num_stripes)
 314 {
 315         BUG_ON(num_stripes == 0);
 316         return sizeof(struct btrfs_chunk) +
 317                 sizeof(struct btrfs_stripe) * (num_stripes - 1);
 318 }
 319
 320 #define BTRFS_HEADER_FLAG_WRITTEN               (1ULL << 0)
 321 #define BTRFS_HEADER_FLAG_RELOC                 (1ULL << 1)
 322 #define BTRFS_SUPER_FLAG_SEEDING                (1ULL << 32)
 323 #define BTRFS_SUPER_FLAG_METADUMP               (1ULL << 33)
 324 #define BTRFS_SUPER_FLAG_METADUMP_V2            (1ULL << 34)
 325 #define BTRFS_SUPER_FLAG_CHANGING_FSID          (1ULL << 35)
 326
 327 #define BTRFS_BACKREF_REV_MAX           256
 328 #define BTRFS_BACKREF_REV_SHIFT         56
 329 #define BTRFS_BACKREF_REV_MASK          (((u64)BTRFS_BACKREF_REV_MAX - 1) << \
 330                                          BTRFS_BACKREF_REV_SHIFT)
 331
 332 #define BTRFS_OLD_BACKREF_REV           0
 333 #define BTRFS_MIXED_BACKREF_REV         1
 334
 335 /*
 336  * every tree block (leaf or node) starts with this header.
 337  */
 338 struct btrfs_header {
 339         /* these first four must match the super block */
 340         u8 csum[BTRFS_CSUM_SIZE];
 341         u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
 342         __le64 bytenr; /* which block this node is supposed to live in */
 343         __le64 flags;
 344
 345         /* allowed to be different from the super from here on down */
 346         u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
 347         __le64 generation;
 348         __le64 owner;
 349         __le32 nritems;
 350         u8 level;
 351 } __attribute__ ((__packed__));
 352
 353 #define BTRFS_NODEPTRS_PER_BLOCK(r) (((r)->nodesize - \
 354                                 sizeof(struct btrfs_header)) / \
 355                                 sizeof(struct btrfs_key_ptr))
 356 #define __BTRFS_LEAF_DATA_SIZE(bs) ((bs) - sizeof(struct btrfs_header))
 357 #define BTRFS_LEAF_DATA_SIZE(r) (__BTRFS_LEAF_DATA_SIZE(r->nodesize))
 358 #define BTRFS_MAX_INLINE_DATA_SIZE(r) (BTRFS_LEAF_DATA_SIZE(r) - \
 359                                         sizeof(struct btrfs_item) - \
 360                                         sizeof(struct btrfs_file_extent_item))
 361 #define BTRFS_MAX_XATTR_SIZE(r) (BTRFS_LEAF_DATA_SIZE(r) - \
 362                                  sizeof(struct btrfs_item) -\
 363                                  sizeof(struct btrfs_dir_item))
 364
 365
 366 /*
 367  * this is a very generous portion of the super block, giving us
 368  * room to translate 14 chunks with 3 stripes each.
 369  */
 370 #define BTRFS_SYSTEM_CHUNK_ARRAY_SIZE 2048
 371 #define BTRFS_LABEL_SIZE 256
 372
 373 /*
 374  * just in case we somehow lose the roots and are not able to mount,
 375  * we store an array of the roots from previous transactions
 376  * in the super.
 377  */
 378 #define BTRFS_NUM_BACKUP_ROOTS 4
 379 struct btrfs_root_backup {
 380         __le64 tree_root;
 381         __le64 tree_root_gen;
 382
 383         __le64 chunk_root;
 384         __le64 chunk_root_gen;
 385
 386         __le64 extent_root;
 387         __le64 extent_root_gen;
 388
 389         __le64 fs_root;
 390         __le64 fs_root_gen;
 391
 392         __le64 dev_root;
 393         __le64 dev_root_gen;
 394
 395         __le64 csum_root;
 396         __le64 csum_root_gen;
 397
 398         __le64 total_bytes;
 399         __le64 bytes_used;
 400         __le64 num_devices;
 401         /* future */
 402         __le64 unsed_64[4];
 403
 404         u8 tree_root_level;
 405         u8 chunk_root_level;
 406         u8 extent_root_level;
 407         u8 fs_root_level;
 408         u8 dev_root_level;
 409         u8 csum_root_level;
 410         /* future and to align */
 411         u8 unused_8[10];
 412 } __attribute__ ((__packed__));
 413
 414 /*
 415  * the super block basically lists the main trees of the FS
 416  * it currently lacks any block count etc etc
 417  */
 418 struct btrfs_super_block {
 419         u8 csum[BTRFS_CSUM_SIZE];
 420         /* the first 3 fields must match struct btrfs_header */
 421         u8 fsid[BTRFS_FSID_SIZE];    /* FS specific uuid */
 422         __le64 bytenr; /* this block number */
 423         __le64 flags;
 424
 425         /* allowed to be different from the btrfs_header from here own down */
 426         __le64 magic;
 427         __le64 generation;
 428         __le64 root;
 429         __le64 chunk_root;
 430         __le64 log_root;
 431
 432         /* this will help find the new super based on the log root */
 433         __le64 log_root_transid;
 434         __le64 total_bytes;
 435         __le64 bytes_used;
 436         __le64 root_dir_objectid;
 437         __le64 num_devices;
 438         __le32 sectorsize;
 439         __le32 nodesize;
 440         /* Unused and must be equal to nodesize */
 441         __le32 leafsize;
 442         __le32 stripesize;
 443         __le32 sys_chunk_array_size;
 444         __le64 chunk_root_generation;
 445         __le64 compat_flags;
 446         __le64 compat_ro_flags;
 447         __le64 incompat_flags;
 448         __le16 csum_type;
 449         u8 root_level;
 450         u8 chunk_root_level;
 451         u8 log_root_level;
 452         struct btrfs_dev_item dev_item;
 453
 454         char label[BTRFS_LABEL_SIZE];
 455
 456         __le64 cache_generation;
 457         __le64 uuid_tree_generation;
 458
 459         /* future expansion */
 460         __le64 reserved[30];
 461         u8 sys_chunk_array[BTRFS_SYSTEM_CHUNK_ARRAY_SIZE];
 462         struct btrfs_root_backup super_roots[BTRFS_NUM_BACKUP_ROOTS];
 463 } __attribute__ ((__packed__));
 464
 465 /*
 466  * Compat flags that we support.  If any incompat flags are set other than the
 467  * ones specified below then we will fail to mount
 468  */
 469 #define BTRFS_FEATURE_COMPAT_RO_FREE_SPACE_TREE (1ULL << 0)
 470 /*
 471  * Older kernels on big-endian systems produced broken free space tree bitmaps,
 472  * and btrfs-progs also used to corrupt the free space tree. If this bit is
 473  * clear, then the free space tree cannot be trusted. btrfs-progs can also
 474  * intentionally clear this bit to ask the kernel to rebuild the free space
 475  * tree.
 476  */
 477 #define BTRFS_FEATURE_COMPAT_RO_FREE_SPACE_TREE_VALID   (1ULL << 1)
 478
 479 #define BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF    (1ULL << 0)
 480 #define BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL   (1ULL << 1)
 481 #define BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS     (1ULL << 2)
 482 #define BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO     (1ULL << 3)
 483
 484 /*
 485  * some patches floated around with a second compression method
 486  * lets save that incompat here for when they do get in
 487  * Note we don't actually support it, we're just reserving the
 488  * number
 489  */
 490 #define BTRFS_FEATURE_INCOMPAT_COMPRESS_LZOv2   (1ULL << 4)
 491
 492 /*
 493  * older kernels tried to do bigger metadata blocks, but the
 494  * code was pretty buggy.  Lets not let them try anymore.
 495  */
 496 #define BTRFS_FEATURE_INCOMPAT_BIG_METADATA     (1ULL << 5)
 497 #define BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF    (1ULL << 6)
 498 #define BTRFS_FEATURE_INCOMPAT_RAID56           (1ULL << 7)
 499 #define BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA  (1ULL << 8)
 500 #define BTRFS_FEATURE_INCOMPAT_NO_HOLES         (1ULL << 9)
 501
 502 #define BTRFS_FEATURE_COMPAT_SUPP               0ULL
 503
 504 /*
 505  * The FREE_SPACE_TREE and FREE_SPACE_TREE_VALID compat_ro bits must not be
 506  * added here until read-write support for the free space tree is implemented in
 507  * btrfs-progs.
 508  */
 509 #define BTRFS_FEATURE_COMPAT_RO_SUPP            0ULL
 510
 511 #define BTRFS_FEATURE_INCOMPAT_SUPP                     \
 512         (BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF |         \
 513          BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL |        \
 514          BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO |          \
 515          BTRFS_FEATURE_INCOMPAT_BIG_METADATA |          \
 516          BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF |         \
 517          BTRFS_FEATURE_INCOMPAT_RAID56 |                \
 518          BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS |          \
 519          BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA |       \
 520          BTRFS_FEATURE_INCOMPAT_NO_HOLES)
 521
 522 /*
 523  * A leaf is full of items. offset and size tell us where to find
 524  * the item in the leaf (relative to the start of the data area)
 525  */
 526 struct btrfs_item {
 527         struct btrfs_disk_key key;
 528         __le32 offset;
 529         __le32 size;
 530 } __attribute__ ((__packed__));
 531
 532 /*
 533  * leaves have an item area and a data area:
 534  * [item0, item1....itemN] [free space] [dataN...data1, data0]
 535  *
 536  * The data is separate from the items to get the keys closer together
 537  * during searches.
 538  */
 539 struct btrfs_leaf {
 540         struct btrfs_header header;
 541         struct btrfs_item items[];
 542 } __attribute__ ((__packed__));
 543
 544 /*
 545  * all non-leaf blocks are nodes, they hold only keys and pointers to
 546  * other blocks
 547  */
 548 struct btrfs_key_ptr {
 549         struct btrfs_disk_key key;
 550         __le64 blockptr;
 551         __le64 generation;
 552 } __attribute__ ((__packed__));
 553
 554 struct btrfs_node {
 555         struct btrfs_header header;
 556         struct btrfs_key_ptr ptrs[];
 557 } __attribute__ ((__packed__));
 558
 559 /*
 560  * btrfs_paths remember the path taken from the root down to the leaf.
 561  * level 0 is always the leaf, and nodes[1...BTRFS_MAX_LEVEL] will point
 562  * to any other levels that are present.
 563  *
 564  * The slots array records the index of the item or block pointer
 565  * used while walking the tree.
 566  */
 567
 568 struct btrfs_path {
 569         struct extent_buffer *nodes[BTRFS_MAX_LEVEL];
 570         int slots[BTRFS_MAX_LEVEL];
 571 #if 0
 572         /* The kernel locking sheme is not done in userspace. */
 573         int locks[BTRFS_MAX_LEVEL];
 574 #endif
 575         signed char reada;
 576         /* keep some upper locks as we walk down */
 577         u8 lowest_level;
 578
 579         /*
 580          * set by btrfs_split_item, tells search_slot to keep all locks
 581          * and to force calls to keep space in the nodes
 582          */
 583         u8 search_for_split;
 584         u8 skip_check_block;
 585 };
 586
 587 /*
 588  * items in the extent btree are used to record the objectid of the
 589  * owner of the block and the number of references
 590  */
 591
 592 struct btrfs_extent_item {
 593         __le64 refs;
 594         __le64 generation;
 595         __le64 flags;
 596 } __attribute__ ((__packed__));
 597
 598 struct btrfs_extent_item_v0 {
 599         __le32 refs;
 600 } __attribute__ ((__packed__));
 601
 602 #define BTRFS_MAX_EXTENT_ITEM_SIZE(r) ((BTRFS_LEAF_DATA_SIZE(r) >> 4) - \
 603                                         sizeof(struct btrfs_item))
 604 #define BTRFS_MAX_EXTENT_SIZE           (128 * 1024 * 1024)
 605
 606 #define BTRFS_EXTENT_FLAG_DATA          (1ULL << 0)
 607 #define BTRFS_EXTENT_FLAG_TREE_BLOCK    (1ULL << 1)
 608
 609 /* following flags only apply to tree blocks */
 610
 611 /* use full backrefs for extent pointers in the block*/
 612 #define BTRFS_BLOCK_FLAG_FULL_BACKREF   (1ULL << 8)
 613
 614 struct btrfs_tree_block_info {
 615         struct btrfs_disk_key key;
 616         u8 level;
 617 } __attribute__ ((__packed__));
 618
 619 struct btrfs_extent_data_ref {
 620         __le64 root;
 621         __le64 objectid;
 622         __le64 offset;
 623         __le32 count;
 624 } __attribute__ ((__packed__));
 625
 626 struct btrfs_shared_data_ref {
 627         __le32 count;
 628 } __attribute__ ((__packed__));
 629
 630 struct btrfs_extent_inline_ref {
 631         u8 type;
 632         __le64 offset;
 633 } __attribute__ ((__packed__));
 634
 635 struct btrfs_extent_ref_v0 {
 636         __le64 root;
 637         __le64 generation;
 638         __le64 objectid;
 639         __le32 count;
 640 } __attribute__ ((__packed__));
 641
 642 /* dev extents record free space on individual devices.  The owner
 643  * field points back to the chunk allocation mapping tree that allocated
 644  * the extent.  The chunk tree uuid field is a way to double check the owner
 645  */
 646 struct btrfs_dev_extent {
 647         __le64 chunk_tree;
 648         __le64 chunk_objectid;
 649         __le64 chunk_offset;
 650         __le64 length;
 651         u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
 652 } __attribute__ ((__packed__));
 653
 654 struct btrfs_inode_ref {
 655         __le64 index;
 656         __le16 name_len;
 657         /* name goes here */
 658 } __attribute__ ((__packed__));
 659
 660 struct btrfs_inode_extref {
 661         __le64 parent_objectid;
 662         __le64 index;
 663         __le16 name_len;
 664         __u8   name[0]; /* name goes here */
 665 } __attribute__ ((__packed__));
 666
 667 struct btrfs_timespec {
 668         __le64 sec;
 669         __le32 nsec;
 670 } __attribute__ ((__packed__));
 671
 672 typedef enum {
 673         BTRFS_COMPRESS_NONE  = 0,
 674         BTRFS_COMPRESS_ZLIB  = 1,
 675         BTRFS_COMPRESS_LZO   = 2,
 676         BTRFS_COMPRESS_TYPES = 2,
 677         BTRFS_COMPRESS_LAST  = 3,
 678 } btrfs_compression_type;
 679
 680 /* we don't understand any encryption methods right now */
 681 typedef enum {
 682         BTRFS_ENCRYPTION_NONE = 0,
 683         BTRFS_ENCRYPTION_LAST = 1,
 684 } btrfs_encryption_type;
 685
 686 enum btrfs_tree_block_status {
 687         BTRFS_TREE_BLOCK_CLEAN,
 688         BTRFS_TREE_BLOCK_INVALID_NRITEMS,
 689         BTRFS_TREE_BLOCK_INVALID_PARENT_KEY,
 690         BTRFS_TREE_BLOCK_BAD_KEY_ORDER,
 691         BTRFS_TREE_BLOCK_INVALID_LEVEL,
 692         BTRFS_TREE_BLOCK_INVALID_FREE_SPACE,
 693         BTRFS_TREE_BLOCK_INVALID_OFFSETS,
 694 };
 695
 696 struct btrfs_inode_item {
 697         /* nfs style generation number */
 698         __le64 generation;
 699         /* transid that last touched this inode */
 700         __le64 transid;
 701         __le64 size;
 702         __le64 nbytes;
 703         __le64 block_group;
 704         __le32 nlink;
 705         __le32 uid;
 706         __le32 gid;
 707         __le32 mode;
 708         __le64 rdev;
 709         __le64 flags;
 710
 711         /* modification sequence number for NFS */
 712         __le64 sequence;
 713
 714         /*
 715          * a little future expansion, for more than this we can
 716          * just grow the inode item and version it
 717          */
 718         __le64 reserved[4];
 719         struct btrfs_timespec atime;
 720         struct btrfs_timespec ctime;
 721         struct btrfs_timespec mtime;
 722         struct btrfs_timespec otime;
 723 } __attribute__ ((__packed__));
 724
 725 struct btrfs_dir_log_item {
 726         __le64 end;
 727 } __attribute__ ((__packed__));
 728
 729 struct btrfs_dir_item {
 730         struct btrfs_disk_key location;
 731         __le64 transid;
 732         __le16 data_len;
 733         __le16 name_len;
 734         u8 type;
 735 } __attribute__ ((__packed__));
 736
 737 struct btrfs_root_item_v0 {
 738         struct btrfs_inode_item inode;
 739         __le64 generation;
 740         __le64 root_dirid;
 741         __le64 bytenr;
 742         __le64 byte_limit;
 743         __le64 bytes_used;
 744         __le64 last_snapshot;
 745         __le64 flags;
 746         __le32 refs;
 747         struct btrfs_disk_key drop_progress;
 748         u8 drop_level;
 749         u8 level;
 750 } __attribute__ ((__packed__));
 751
 752 struct btrfs_root_item {
 753         struct btrfs_inode_item inode;
 754         __le64 generation;
 755         __le64 root_dirid;
 756         __le64 bytenr;
 757         __le64 byte_limit;
 758         __le64 bytes_used;
 759         __le64 last_snapshot;
 760         __le64 flags;
 761         __le32 refs;
 762         struct btrfs_disk_key drop_progress;
 763         u8 drop_level;
 764         u8 level;
 765
 766         /*
 767          * The following fields appear after subvol_uuids+subvol_times
 768          * were introduced.
 769          */
 770
 771         /*
 772          * This generation number is used to test if the new fields are valid
 773          * and up to date while reading the root item. Every time the root item
 774          * is written out, the "generation" field is copied into this field. If
 775          * anyone ever mounted the fs with an older kernel, we will have
 776          * mismatching generation values here and thus must invalidate the
 777          * new fields. See btrfs_update_root and btrfs_find_last_root for
 778          * details.
 779          * the offset of generation_v2 is also used as the start for the memset
 780          * when invalidating the fields.
 781          */
 782         __le64 generation_v2;
 783         u8 uuid[BTRFS_UUID_SIZE];
 784         u8 parent_uuid[BTRFS_UUID_SIZE];
 785         u8 received_uuid[BTRFS_UUID_SIZE];
 786         __le64 ctransid; /* updated when an inode changes */
 787         __le64 otransid; /* trans when created */
 788         __le64 stransid; /* trans when sent. non-zero for received subvol */
 789         __le64 rtransid; /* trans when received. non-zero for received subvol */
 790         struct btrfs_timespec ctime;
 791         struct btrfs_timespec otime;
 792         struct btrfs_timespec stime;
 793         struct btrfs_timespec rtime;
 794         __le64 reserved[8]; /* for future */
 795 } __attribute__ ((__packed__));
 796
 797 /*
 798  * this is used for both forward and backward root refs
 799  */
 800 struct btrfs_root_ref {
 801         __le64 dirid;
 802         __le64 sequence;
 803         __le16 name_len;
 804 } __attribute__ ((__packed__));
 805
 806 struct btrfs_disk_balance_args {
 807         /*
 808          * profiles to operate on, single is denoted by
 809          * BTRFS_AVAIL_ALLOC_BIT_SINGLE
 810          */
 811         __le64 profiles;
 812
 813         /*
 814          * usage filter
 815          * BTRFS_BALANCE_ARGS_USAGE with a single value means '0..N'
 816          * BTRFS_BALANCE_ARGS_USAGE_RANGE - range syntax, min..max
 817          */
 818         union {
 819                 __le64 usage;
 820                 struct {
 821                         __le32 usage_min;
 822                         __le32 usage_max;
 823                 };
 824         };
 825
 826         /* devid filter */
 827         __le64 devid;
 828
 829         /* devid subset filter [pstart..pend) */
 830         __le64 pstart;
 831         __le64 pend;
 832
 833         /* btrfs virtual address space subset filter [vstart..vend) */
 834         __le64 vstart;
 835         __le64 vend;
 836
 837         /*
 838          * profile to convert to, single is denoted by
 839          * BTRFS_AVAIL_ALLOC_BIT_SINGLE
 840          */
 841         __le64 target;
 842
 843         /* BTRFS_BALANCE_ARGS_* */
 844         __le64 flags;
 845
 846         /*
 847          * BTRFS_BALANCE_ARGS_LIMIT with value 'limit'
 848          * BTRFS_BALANCE_ARGS_LIMIT_RANGE - the extend version can use minimum
 849          * and maximum
 850          */
 851         union {
 852                 __le64 limit;
 853                 struct {
 854                         __le32 limit_min;
 855                         __le32 limit_max;
 856                 };
 857         };
 858
 859         /*
 860          * Process chunks that cross stripes_min..stripes_max devices,
 861          * BTRFS_BALANCE_ARGS_STRIPES_RANGE
 862          */
 863         __le32 stripes_min;
 864         __le32 stripes_max;
 865
 866         __le64 unused[6];
 867 } __attribute__ ((__packed__));
 868
 869 /*
 870  * store balance parameters to disk so that balance can be properly
 871  * resumed after crash or unmount
 872  */
 873 struct btrfs_balance_item {
 874         /* BTRFS_BALANCE_* */
 875         __le64 flags;
 876
 877         struct btrfs_disk_balance_args data;
 878         struct btrfs_disk_balance_args meta;
 879         struct btrfs_disk_balance_args sys;
 880
 881         __le64 unused[4];
 882 } __attribute__ ((__packed__));
 883
 884 #define BTRFS_FILE_EXTENT_INLINE 0
 885 #define BTRFS_FILE_EXTENT_REG 1
 886 #define BTRFS_FILE_EXTENT_PREALLOC 2
 887
 888 struct btrfs_file_extent_item {
 889         /*
 890          * transaction id that created this extent
 891          */
 892         __le64 generation;
 893         /*
 894          * max number of bytes to hold this extent in ram
 895          * when we split a compressed extent we can't know how big
 896          * each of the resulting pieces will be.  So, this is
 897          * an upper limit on the size of the extent in ram instead of
 898          * an exact limit.
 899          */
 900         __le64 ram_bytes;
 901
 902         /*
 903          * 32 bits for the various ways we might encode the data,
 904          * including compression and encryption.  If any of these
 905          * are set to something a given disk format doesn't understand
 906          * it is treated like an incompat flag for reading and writing,
 907          * but not for stat.
 908          */
 909         u8 compression;
 910         u8 encryption;
 911         __le16 other_encoding; /* spare for later use */
 912
 913         /* are we inline data or a real extent? */
 914         u8 type;
 915
 916         /*
 917          * disk space consumed by the extent, checksum blocks are included
 918          * in these numbers
 919          */
 920         __le64 disk_bytenr;
 921         __le64 disk_num_bytes;
 922         /*
 923          * the logical offset in file blocks (no csums)
 924          * this extent record is for.  This allows a file extent to point
 925          * into the middle of an existing extent on disk, sharing it
 926          * between two snapshots (useful if some bytes in the middle of the
 927          * extent have changed
 928          */
 929         __le64 offset;
 930         /*
 931          * the logical number of file blocks (no csums included)
 932          */
 933         __le64 num_bytes;
 934
 935 } __attribute__ ((__packed__));
 936
 937 struct btrfs_dev_stats_item {
 938         /*
 939          * grow this item struct at the end for future enhancements and keep
 940          * the existing values unchanged
 941          */
 942         __le64 values[BTRFS_DEV_STAT_VALUES_MAX];
 943 } __attribute__ ((__packed__));
 944
 945 struct btrfs_csum_item {
 946         u8 csum;
 947 } __attribute__ ((__packed__));
 948
 949 /*
 950  * We don't want to overwrite 1M at the beginning of device, even though
 951  * there is our 1st superblock at 64k. Some possible reasons:
 952  *  - the first 64k blank is useful for some boot loader/manager
 953  *  - the first 1M could be scratched by buggy partitioner or somesuch
 954  */
 955 #define BTRFS_BLOCK_RESERVED_1M_FOR_SUPER       ((u64)1024 * 1024)
 956
 957 /* tag for the radix tree of block groups in ram */
 958 #define BTRFS_BLOCK_GROUP_DATA          (1ULL << 0)
 959 #define BTRFS_BLOCK_GROUP_SYSTEM        (1ULL << 1)
 960 #define BTRFS_BLOCK_GROUP_METADATA      (1ULL << 2)
 961 #define BTRFS_BLOCK_GROUP_RAID0         (1ULL << 3)
 962 #define BTRFS_BLOCK_GROUP_RAID1         (1ULL << 4)
 963 #define BTRFS_BLOCK_GROUP_DUP           (1ULL << 5)
 964 #define BTRFS_BLOCK_GROUP_RAID10        (1ULL << 6)
 965 #define BTRFS_BLOCK_GROUP_RAID5         (1ULL << 7)
 966 #define BTRFS_BLOCK_GROUP_RAID6         (1ULL << 8)
 967 #define BTRFS_BLOCK_GROUP_RESERVED      BTRFS_AVAIL_ALLOC_BIT_SINGLE
 968 #define BTRFS_NR_RAID_TYPES             7
 969
 970 #define BTRFS_BLOCK_GROUP_TYPE_MASK     (BTRFS_BLOCK_GROUP_DATA |    \
 971                                          BTRFS_BLOCK_GROUP_SYSTEM |  \
 972                                          BTRFS_BLOCK_GROUP_METADATA)
 973
 974 #define BTRFS_BLOCK_GROUP_PROFILE_MASK  (BTRFS_BLOCK_GROUP_RAID0 |   \
 975                                          BTRFS_BLOCK_GROUP_RAID1 |   \
 976                                          BTRFS_BLOCK_GROUP_RAID5 |   \
 977                                          BTRFS_BLOCK_GROUP_RAID6 |   \
 978                                          BTRFS_BLOCK_GROUP_DUP |     \
 979                                          BTRFS_BLOCK_GROUP_RAID10)
 980
 981 /* used in struct btrfs_balance_args fields */
 982 #define BTRFS_AVAIL_ALLOC_BIT_SINGLE    (1ULL << 48)
 983
 984 /*
 985  * GLOBAL_RSV does not exist as a on-disk block group type and is used
 986  * internally for exporting info about global block reserve from space infos
 987  */
 988 #define BTRFS_SPACE_INFO_GLOBAL_RSV    (1ULL << 49)
 989
 990 #define BTRFS_QGROUP_LEVEL_SHIFT                48
 991
 992 static inline u64 btrfs_qgroup_level(u64 qgroupid)
 993 {
 994         return qgroupid >> BTRFS_QGROUP_LEVEL_SHIFT;
 995 }
 996
 997 static inline u64 btrfs_qgroup_subvid(u64 qgroupid)
 998 {
 999         return qgroupid & ((1ULL << BTRFS_QGROUP_LEVEL_SHIFT) - 1);
1000 }
1001
1002 #define BTRFS_QGROUP_STATUS_FLAG_ON             (1ULL << 0)
1003 #define BTRFS_QGROUP_STATUS_FLAG_RESCAN         (1ULL << 1)
1004 #define BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT   (1ULL << 2)
1005
1006 struct btrfs_qgroup_status_item {
1007         __le64 version;
1008         __le64 generation;
1009         __le64 flags;
1010         __le64 rescan;          /* progress during scanning */
1011 } __attribute__ ((__packed__));
1012
1013 struct btrfs_block_group_item {
1014         __le64 used;
1015         __le64 chunk_objectid;
1016         __le64 flags;
1017 } __attribute__ ((__packed__));
1018
1019 struct btrfs_free_space_info {
1020         __le32 extent_count;
1021         __le32 flags;
1022 } __attribute__ ((__packed__));
1023
1024 #define BTRFS_FREE_SPACE_USING_BITMAPS (1ULL << 0)
1025
1026 struct btrfs_qgroup_info_item {
1027         __le64 generation;
1028         __le64 referenced;
1029         __le64 referenced_compressed;
1030         __le64 exclusive;
1031         __le64 exclusive_compressed;
1032 } __attribute__ ((__packed__));
1033
1034 /* flags definition for qgroup limits */
1035 #define BTRFS_QGROUP_LIMIT_MAX_RFER     (1ULL << 0)
1036 #define BTRFS_QGROUP_LIMIT_MAX_EXCL     (1ULL << 1)
1037 #define BTRFS_QGROUP_LIMIT_RSV_RFER     (1ULL << 2)
1038 #define BTRFS_QGROUP_LIMIT_RSV_EXCL     (1ULL << 3)
1039 #define BTRFS_QGROUP_LIMIT_RFER_CMPR    (1ULL << 4)
1040 #define BTRFS_QGROUP_LIMIT_EXCL_CMPR    (1ULL << 5)
1041
1042 struct btrfs_qgroup_limit_item {
1043         __le64 flags;
1044         __le64 max_referenced;
1045         __le64 max_exclusive;
1046         __le64 rsv_referenced;
1047         __le64 rsv_exclusive;
1048 } __attribute__ ((__packed__));
1049
1050 struct btrfs_space_info {
1051         u64 flags;
1052         u64 total_bytes;
1053         u64 bytes_used;
1054         u64 bytes_pinned;
1055         int full;
1056         struct list_head list;
1057 };
1058
1059 struct btrfs_block_group_cache {
1060         struct cache_extent cache;
1061         struct btrfs_key key;
1062         struct btrfs_block_group_item item;
1063         struct btrfs_space_info *space_info;
1064         struct btrfs_free_space_ctl *free_space_ctl;
1065         u64 bytes_super;
1066         u64 pinned;
1067         u64 flags;
1068         int cached;
1069         int ro;
1070 };
1071
1072 struct btrfs_device;
1073 struct btrfs_fs_devices;
1074 struct btrfs_fs_info {
1075         u8 fsid[BTRFS_FSID_SIZE];
1076         u8 *new_fsid;
1077         u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
1078         u8 *new_chunk_tree_uuid;
1079         struct btrfs_root *fs_root;
1080         struct btrfs_root *extent_root;
1081         struct btrfs_root *tree_root;
1082         struct btrfs_root *chunk_root;
1083         struct btrfs_root *dev_root;
1084         struct btrfs_root *csum_root;
1085         struct btrfs_root *quota_root;
1086         struct btrfs_root *free_space_root;
1087
1088         struct rb_root fs_root_tree;
1089
1090         /* the log root tree is a directory of all the other log roots */
1091         struct btrfs_root *log_root_tree;
1092
1093         struct extent_io_tree extent_cache;
1094         struct extent_io_tree free_space_cache;
1095         struct extent_io_tree block_group_cache;
1096         struct extent_io_tree pinned_extents;
1097         struct extent_io_tree pending_del;
1098         struct extent_io_tree extent_ins;
1099         struct extent_io_tree *excluded_extents;
1100
1101         /* logical->physical extent mapping */
1102         struct btrfs_mapping_tree mapping_tree;
1103
1104         u64 generation;
1105         u64 last_trans_committed;
1106
1107         u64 avail_data_alloc_bits;
1108         u64 avail_metadata_alloc_bits;
1109         u64 avail_system_alloc_bits;
1110         u64 data_alloc_profile;
1111         u64 metadata_alloc_profile;
1112         u64 system_alloc_profile;
1113         u64 alloc_start;
1114
1115         struct btrfs_trans_handle *running_transaction;
1116         struct btrfs_super_block *super_copy;
1117         struct mutex fs_mutex;
1118
1119         u64 super_bytenr;
1120         u64 total_pinned;
1121
1122         struct list_head dirty_cowonly_roots;
1123         struct list_head recow_ebs;
1124
1125         struct btrfs_fs_devices *fs_devices;
1126         struct list_head space_info;
1127         int system_allocs;
1128
1129         unsigned int readonly:1;
1130         unsigned int on_restoring:1;
1131         unsigned int is_chunk_recover:1;
1132         unsigned int quota_enabled:1;
1133         unsigned int suppress_check_block_errors:1;
1134         unsigned int ignore_fsid_mismatch:1;
1135         unsigned int ignore_chunk_tree_error:1;
1136         unsigned int avoid_meta_chunk_alloc:1;
1137         unsigned int avoid_sys_chunk_alloc:1;
1138         unsigned int finalize_on_close:1;
1139
1140         int (*free_extent_hook)(struct btrfs_trans_handle *trans,
1141                                 struct btrfs_root *root,
1142                                 u64 bytenr, u64 num_bytes, u64 parent,
1143                                 u64 root_objectid, u64 owner, u64 offset,
1144                                 int refs_to_drop);
1145         struct cache_tree *fsck_extent_cache;
1146         struct cache_tree *corrupt_blocks;
1147
1148 };
1149
1150 /*
1151  * in ram representation of the tree.  extent_root is used for all allocations
1152  * and for the extent tree extent_root root.
1153  */
1154 struct btrfs_root {
1155         struct extent_buffer *node;
1156         struct extent_buffer *commit_root;
1157         struct btrfs_root_item root_item;
1158         struct btrfs_key root_key;
1159         struct btrfs_fs_info *fs_info;
1160         u64 objectid;
1161         u64 last_trans;
1162
1163         /* data allocations are done in sectorsize units */
1164         u32 sectorsize;
1165
1166         /* node allocations are done in nodesize units */
1167         u32 nodesize;
1168
1169         /* Unused, equal to nodesize */
1170         u32 leafsize;
1171
1172         /* leaf allocations are done in nodesize units */
1173         u32 stripesize;
1174
1175         int ref_cows;
1176         int track_dirty;
1177
1178
1179         u32 type;
1180         u64 highest_inode;
1181         u64 last_inode_alloc;
1182
1183         /*
1184          * Record orphan data extent ref
1185          *
1186          * TODO: Don't restore things in btrfs_root.
1187          * Directly record it into inode_record, which needs a lot of
1188          * infrastructure change to allow cooperation between extent
1189          * and fs tree scan.
1190          */
1191         struct list_head orphan_data_extents;
1192
1193         /* the dirty list is only used by non-reference counted roots */
1194         struct list_head dirty_list;
1195         struct rb_node rb_node;
1196 };
1197
1198 /*
1199  * inode items have the data typically returned from stat and store other
1200  * info about object characteristics.  There is one for every file and dir in
1201  * the FS
1202  */
1203 #define BTRFS_INODE_ITEM_KEY            1
1204 #define BTRFS_INODE_REF_KEY             12
1205 #define BTRFS_INODE_EXTREF_KEY          13
1206 #define BTRFS_XATTR_ITEM_KEY            24
1207 #define BTRFS_ORPHAN_ITEM_KEY           48
1208
1209 #define BTRFS_DIR_LOG_ITEM_KEY  60
1210 #define BTRFS_DIR_LOG_INDEX_KEY 72
1211 /*
1212  * dir items are the name -> inode pointers in a directory.  There is one
1213  * for every name in a directory.
1214  */
1215 #define BTRFS_DIR_ITEM_KEY      84
1216 #define BTRFS_DIR_INDEX_KEY     96
1217
1218 /*
1219  * extent data is for file data
1220  */
1221 #define BTRFS_EXTENT_DATA_KEY   108
1222
1223 /*
1224  * csum items have the checksums for data in the extents
1225  */
1226 #define BTRFS_CSUM_ITEM_KEY     120
1227 /*
1228  * extent csums are stored in a separate tree and hold csums for
1229  * an entire extent on disk.
1230  */
1231 #define BTRFS_EXTENT_CSUM_KEY   128
1232
1233 /*
1234  * root items point to tree roots.  There are typically in the root
1235  * tree used by the super block to find all the other trees
1236  */
1237 #define BTRFS_ROOT_ITEM_KEY     132
1238
1239 /*
1240  * root backrefs tie subvols and snapshots to the directory entries that
1241  * reference them
1242  */
1243 #define BTRFS_ROOT_BACKREF_KEY  144
1244
1245 /*
1246  * root refs make a fast index for listing all of the snapshots and
1247  * subvolumes referenced by a given root.  They point directly to the
1248  * directory item in the root that references the subvol
1249  */
1250 #define BTRFS_ROOT_REF_KEY      156
1251
1252 /*
1253  * extent items are in the extent map tree.  These record which blocks
1254  * are used, and how many references there are to each block
1255  */
1256 #define BTRFS_EXTENT_ITEM_KEY   168
1257
1258 /*
1259  * The same as the BTRFS_EXTENT_ITEM_KEY, except it's metadata we already know
1260  * the length, so we save the level in key->offset instead of the length.
1261  */
1262 #define BTRFS_METADATA_ITEM_KEY 169
1263
1264 #define BTRFS_TREE_BLOCK_REF_KEY        176
1265
1266 #define BTRFS_EXTENT_DATA_REF_KEY       178
1267
1268 /* old style extent backrefs */
1269 #define BTRFS_EXTENT_REF_V0_KEY         180
1270
1271 #define BTRFS_SHARED_BLOCK_REF_KEY      182
1272
1273 #define BTRFS_SHARED_DATA_REF_KEY       184
1274
1275
1276 /*
1277  * block groups give us hints into the extent allocation trees.  Which
1278  * blocks are free etc etc
1279  */
1280 #define BTRFS_BLOCK_GROUP_ITEM_KEY 192
1281
1282 /*
1283  * Every block group is represented in the free space tree by a free space info
1284  * item, which stores some accounting information. It is keyed on
1285  * (block_group_start, FREE_SPACE_INFO, block_group_length).
1286  */
1287 #define BTRFS_FREE_SPACE_INFO_KEY 198
1288
1289 /*
1290  * A free space extent tracks an extent of space that is free in a block group.
1291  * It is keyed on (start, FREE_SPACE_EXTENT, length).
1292  */
1293 #define BTRFS_FREE_SPACE_EXTENT_KEY 199
1294
1295 /*
1296  * When a block group becomes very fragmented, we convert it to use bitmaps
1297  * instead of extents. A free space bitmap is keyed on
1298  * (start, FREE_SPACE_BITMAP, length); the corresponding item is a bitmap with
1299  * (length / sectorsize) bits.
1300  */
1301 #define BTRFS_FREE_SPACE_BITMAP_KEY 200
1302
1303 #define BTRFS_DEV_EXTENT_KEY    204
1304 #define BTRFS_DEV_ITEM_KEY      216
1305 #define BTRFS_CHUNK_ITEM_KEY    228
1306
1307 #define BTRFS_BALANCE_ITEM_KEY  248
1308
1309 /*
1310  * quota groups
1311  */
1312 #define BTRFS_QGROUP_STATUS_KEY         240
1313 #define BTRFS_QGROUP_INFO_KEY           242
1314 #define BTRFS_QGROUP_LIMIT_KEY          244
1315 #define BTRFS_QGROUP_RELATION_KEY       246
1316
1317 /*
1318  * Obsolete name, see BTRFS_TEMPORARY_ITEM_KEY.
1319  */
1320 #define BTRFS_BALANCE_ITEM_KEY  248
1321
1322 /*
1323  * The key type for tree items that are stored persistently, but do not need to
1324  * exist for extended period of time. The items can exist in any tree.
1325  *
1326  * [subtype, BTRFS_TEMPORARY_ITEM_KEY, data]
1327  *
1328  * Existing items:
1329  *
1330  * - balance status item
1331  *   (BTRFS_BALANCE_OBJECTID, BTRFS_TEMPORARY_ITEM_KEY, 0)
1332  */
1333 #define BTRFS_TEMPORARY_ITEM_KEY        248
1334
1335 /*
1336  * Obsolete name, see BTRFS_PERSISTENT_ITEM_KEY
1337  */
1338 #define BTRFS_DEV_STATS_KEY             249
1339
1340 /*
1341  * The key type for tree items that are stored persistently and usually exist
1342  * for a long period, eg. filesystem lifetime. The item kinds can be status
1343  * information, stats or preference values. The item can exist in any tree.
1344  *
1345  * [subtype, BTRFS_PERSISTENT_ITEM_KEY, data]
1346  *
1347  * Existing items:
1348  *
1349  * - device statistics, store IO stats in the device tree, one key for all
1350  *   stats
1351  *   (BTRFS_DEV_STATS_OBJECTID, BTRFS_DEV_STATS_KEY, 0)
1352  */
1353 #define BTRFS_PERSISTENT_ITEM_KEY       249
1354
1355 /*
1356  * Persistently stores the device replace state in the device tree.
1357  * The key is built like this: (0, BTRFS_DEV_REPLACE_KEY, 0).
1358  */
1359 #define BTRFS_DEV_REPLACE_KEY   250
1360
1361 /*
1362  * Stores items that allow to quickly map UUIDs to something else.
1363  * These items are part of the filesystem UUID tree.
1364  * The key is built like this:
1365  * (UUID_upper_64_bits, BTRFS_UUID_KEY*, UUID_lower_64_bits).
1366  */
1367 #if BTRFS_UUID_SIZE != 16
1368 #error "UUID items require BTRFS_UUID_SIZE == 16!"
1369 #endif
1370 #define BTRFS_UUID_KEY_SUBVOL   251     /* for UUIDs assigned to subvols */
1371 #define BTRFS_UUID_KEY_RECEIVED_SUBVOL  252     /* for UUIDs assigned to
1372                                                  * received subvols */
1373
1374 /*
1375  * string items are for debugging.  They just store a short string of
1376  * data in the FS
1377  */
1378 #define BTRFS_STRING_ITEM_KEY   253
1379 /*
1380  * Inode flags
1381  */
1382 #define BTRFS_INODE_NODATASUM           (1 << 0)
1383 #define BTRFS_INODE_NODATACOW           (1 << 1)
1384 #define BTRFS_INODE_READONLY            (1 << 2)
1385 #define BTRFS_INODE_NOCOMPRESS          (1 << 3)
1386 #define BTRFS_INODE_PREALLOC            (1 << 4)
1387 #define BTRFS_INODE_SYNC                (1 << 5)
1388 #define BTRFS_INODE_IMMUTABLE           (1 << 6)
1389 #define BTRFS_INODE_APPEND              (1 << 7)
1390 #define BTRFS_INODE_NODUMP              (1 << 8)
1391 #define BTRFS_INODE_NOATIME             (1 << 9)
1392 #define BTRFS_INODE_DIRSYNC             (1 << 10)
1393 #define BTRFS_INODE_COMPRESS            (1 << 11)
1394
1395 #define read_eb_member(eb, ptr, type, member, result) (                 \
1396         read_extent_buffer(eb, (char *)(result),                        \
1397                            ((unsigned long)(ptr)) +                     \
1398                             offsetof(type, member),                     \
1399                            sizeof(((type *)0)->member)))
1400
1401 #define write_eb_member(eb, ptr, type, member, result) (                \
1402         write_extent_buffer(eb, (char *)(result),                       \
1403                            ((unsigned long)(ptr)) +                     \
1404                             offsetof(type, member),                     \
1405                            sizeof(((type *)0)->member)))
1406
1407 #define BTRFS_SETGET_HEADER_FUNCS(name, type, member, bits)             \
1408 static inline u##bits btrfs_##name(const struct extent_buffer *eb)      \
1409 {                                                                       \
1410         const struct btrfs_header *h = (struct btrfs_header *)eb->data; \
1411         return le##bits##_to_cpu(h->member);                            \
1412 }                                                                       \
1413 static inline void btrfs_set_##name(struct extent_buffer *eb,           \
1414                                     u##bits val)                        \
1415 {                                                                       \
1416         struct btrfs_header *h = (struct btrfs_header *)eb->data;       \
1417         h->member = cpu_to_le##bits(val);                               \
1418 }
1419
1420 #define BTRFS_SETGET_FUNCS(name, type, member, bits)                    \
1421 static inline u##bits btrfs_##name(const struct extent_buffer *eb,      \
1422                                    const type *s)                       \
1423 {                                                                       \
1424         unsigned long offset = (unsigned long)s;                        \
1425         const type *p = (type *) (eb->data + offset);                   \
1426         return get_unaligned_le##bits(&p->member);                      \
1427 }                                                                       \
1428 static inline void btrfs_set_##name(struct extent_buffer *eb,           \
1429                                     type *s, u##bits val)               \
1430 {                                                                       \
1431         unsigned long offset = (unsigned long)s;                        \
1432         type *p = (type *) (eb->data + offset);                         \
1433         put_unaligned_le##bits(val, &p->member);                        \
1434 }
1435
1436 #define BTRFS_SETGET_STACK_FUNCS(name, type, member, bits)              \
1437 static inline u##bits btrfs_##name(const type *s)                       \
1438 {                                                                       \
1439         return le##bits##_to_cpu(s->member);                            \
1440 }                                                                       \
1441 static inline void btrfs_set_##name(type *s, u##bits val)               \
1442 {                                                                       \
1443         s->member = cpu_to_le##bits(val);                               \
1444 }
1445
1446 BTRFS_SETGET_FUNCS(device_type, struct btrfs_dev_item, type, 64);
1447 BTRFS_SETGET_FUNCS(device_total_bytes, struct btrfs_dev_item, total_bytes, 64);
1448 BTRFS_SETGET_FUNCS(device_bytes_used, struct btrfs_dev_item, bytes_used, 64);
1449 BTRFS_SETGET_FUNCS(device_io_align, struct btrfs_dev_item, io_align, 32);
1450 BTRFS_SETGET_FUNCS(device_io_width, struct btrfs_dev_item, io_width, 32);
1451 BTRFS_SETGET_FUNCS(device_start_offset, struct btrfs_dev_item,
1452                    start_offset, 64);
1453 BTRFS_SETGET_FUNCS(device_sector_size, struct btrfs_dev_item, sector_size, 32);
1454 BTRFS_SETGET_FUNCS(device_id, struct btrfs_dev_item, devid, 64);
1455 BTRFS_SETGET_FUNCS(device_group, struct btrfs_dev_item, dev_group, 32);
1456 BTRFS_SETGET_FUNCS(device_seek_speed, struct btrfs_dev_item, seek_speed, 8);
1457 BTRFS_SETGET_FUNCS(device_bandwidth, struct btrfs_dev_item, bandwidth, 8);
1458 BTRFS_SETGET_FUNCS(device_generation, struct btrfs_dev_item, generation, 64);
1459
1460 BTRFS_SETGET_STACK_FUNCS(stack_device_type, struct btrfs_dev_item, type, 64);
1461 BTRFS_SETGET_STACK_FUNCS(stack_device_total_bytes, struct btrfs_dev_item,
1462                          total_bytes, 64);
1463 BTRFS_SETGET_STACK_FUNCS(stack_device_bytes_used, struct btrfs_dev_item,
1464                          bytes_used, 64);
1465 BTRFS_SETGET_STACK_FUNCS(stack_device_io_align, struct btrfs_dev_item,
1466                          io_align, 32);
1467 BTRFS_SETGET_STACK_FUNCS(stack_device_io_width, struct btrfs_dev_item,
1468                          io_width, 32);
1469 BTRFS_SETGET_STACK_FUNCS(stack_device_sector_size, struct btrfs_dev_item,
1470                          sector_size, 32);
1471 BTRFS_SETGET_STACK_FUNCS(stack_device_id, struct btrfs_dev_item, devid, 64);
1472 BTRFS_SETGET_STACK_FUNCS(stack_device_group, struct btrfs_dev_item,
1473                          dev_group, 32);
1474 BTRFS_SETGET_STACK_FUNCS(stack_device_seek_speed, struct btrfs_dev_item,
1475                          seek_speed, 8);
1476 BTRFS_SETGET_STACK_FUNCS(stack_device_bandwidth, struct btrfs_dev_item,
1477                          bandwidth, 8);
1478 BTRFS_SETGET_STACK_FUNCS(stack_device_generation, struct btrfs_dev_item,
1479                          generation, 64);
1480
1481 static inline char *btrfs_device_uuid(struct btrfs_dev_item *d)
1482 {
1483         return (char *)d + offsetof(struct btrfs_dev_item, uuid);
1484 }
1485
1486 static inline char *btrfs_device_fsid(struct btrfs_dev_item *d)
1487 {
1488         return (char *)d + offsetof(struct btrfs_dev_item, fsid);
1489 }
1490
1491 BTRFS_SETGET_FUNCS(chunk_length, struct btrfs_chunk, length, 64);
1492 BTRFS_SETGET_FUNCS(chunk_owner, struct btrfs_chunk, owner, 64);
1493 BTRFS_SETGET_FUNCS(chunk_stripe_len, struct btrfs_chunk, stripe_len, 64);
1494 BTRFS_SETGET_FUNCS(chunk_io_align, struct btrfs_chunk, io_align, 32);
1495 BTRFS_SETGET_FUNCS(chunk_io_width, struct btrfs_chunk, io_width, 32);
1496 BTRFS_SETGET_FUNCS(chunk_sector_size, struct btrfs_chunk, sector_size, 32);
1497 BTRFS_SETGET_FUNCS(chunk_type, struct btrfs_chunk, type, 64);
1498 BTRFS_SETGET_FUNCS(chunk_num_stripes, struct btrfs_chunk, num_stripes, 16);
1499 BTRFS_SETGET_FUNCS(chunk_sub_stripes, struct btrfs_chunk, sub_stripes, 16);
1500 BTRFS_SETGET_FUNCS(stripe_devid, struct btrfs_stripe, devid, 64);
1501 BTRFS_SETGET_FUNCS(stripe_offset, struct btrfs_stripe, offset, 64);
1502
1503 static inline char *btrfs_stripe_dev_uuid(struct btrfs_stripe *s)
1504 {
1505         return (char *)s + offsetof(struct btrfs_stripe, dev_uuid);
1506 }
1507
1508 BTRFS_SETGET_STACK_FUNCS(stack_chunk_length, struct btrfs_chunk, length, 64);
1509 BTRFS_SETGET_STACK_FUNCS(stack_chunk_owner, struct btrfs_chunk, owner, 64);
1510 BTRFS_SETGET_STACK_FUNCS(stack_chunk_stripe_len, struct btrfs_chunk,
1511                          stripe_len, 64);
1512 BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_align, struct btrfs_chunk,
1513                          io_align, 32);
1514 BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_width, struct btrfs_chunk,
1515                          io_width, 32);
1516 BTRFS_SETGET_STACK_FUNCS(stack_chunk_sector_size, struct btrfs_chunk,
1517                          sector_size, 32);
1518 BTRFS_SETGET_STACK_FUNCS(stack_chunk_type, struct btrfs_chunk, type, 64);
1519 BTRFS_SETGET_STACK_FUNCS(stack_chunk_num_stripes, struct btrfs_chunk,
1520                          num_stripes, 16);
1521 BTRFS_SETGET_STACK_FUNCS(stack_chunk_sub_stripes, struct btrfs_chunk,
1522                          sub_stripes, 16);
1523 BTRFS_SETGET_STACK_FUNCS(stack_stripe_devid, struct btrfs_stripe, devid, 64);
1524 BTRFS_SETGET_STACK_FUNCS(stack_stripe_offset, struct btrfs_stripe, offset, 64);
1525
1526 static inline struct btrfs_stripe *btrfs_stripe_nr(struct btrfs_chunk *c,
1527                                                    int nr)
1528 {
1529         unsigned long offset = (unsigned long)c;
1530         offset += offsetof(struct btrfs_chunk, stripe);
1531         offset += nr * sizeof(struct btrfs_stripe);
1532         return (struct btrfs_stripe *)offset;
1533 }
1534
1535 static inline char *btrfs_stripe_dev_uuid_nr(struct btrfs_chunk *c, int nr)
1536 {
1537         return btrfs_stripe_dev_uuid(btrfs_stripe_nr(c, nr));
1538 }
1539
1540 static inline u64 btrfs_stripe_offset_nr(struct extent_buffer *eb,
1541                                          struct btrfs_chunk *c, int nr)
1542 {
1543         return btrfs_stripe_offset(eb, btrfs_stripe_nr(c, nr));
1544 }
1545
1546 static inline void btrfs_set_stripe_offset_nr(struct extent_buffer *eb,
1547                                              struct btrfs_chunk *c, int nr,
1548                                              u64 val)
1549 {
1550         btrfs_set_stripe_offset(eb, btrfs_stripe_nr(c, nr), val);
1551 }
1552
1553 static inline u64 btrfs_stripe_devid_nr(struct extent_buffer *eb,
1554                                          struct btrfs_chunk *c, int nr)
1555 {
1556         return btrfs_stripe_devid(eb, btrfs_stripe_nr(c, nr));
1557 }
1558
1559 static inline void btrfs_set_stripe_devid_nr(struct extent_buffer *eb,
1560                                              struct btrfs_chunk *c, int nr,
1561                                              u64 val)
1562 {
1563         btrfs_set_stripe_devid(eb, btrfs_stripe_nr(c, nr), val);
1564 }
1565
1566 /* struct btrfs_block_group_item */
1567 BTRFS_SETGET_STACK_FUNCS(block_group_used, struct btrfs_block_group_item,
1568                          used, 64);
1569 BTRFS_SETGET_FUNCS(disk_block_group_used, struct btrfs_block_group_item,
1570                          used, 64);
1571 BTRFS_SETGET_STACK_FUNCS(block_group_chunk_objectid,
1572                         struct btrfs_block_group_item, chunk_objectid, 64);
1573
1574 BTRFS_SETGET_FUNCS(disk_block_group_chunk_objectid,
1575                    struct btrfs_block_group_item, chunk_objectid, 64);
1576 BTRFS_SETGET_FUNCS(disk_block_group_flags,
1577                    struct btrfs_block_group_item, flags, 64);
1578 BTRFS_SETGET_STACK_FUNCS(block_group_flags,
1579                         struct btrfs_block_group_item, flags, 64);
1580
1581 /* struct btrfs_free_space_info */
1582 BTRFS_SETGET_FUNCS(free_space_extent_count, struct btrfs_free_space_info,
1583                    extent_count, 32);
1584 BTRFS_SETGET_FUNCS(free_space_flags, struct btrfs_free_space_info, flags, 32);
1585
1586 /* struct btrfs_inode_ref */
1587 BTRFS_SETGET_FUNCS(inode_ref_name_len, struct btrfs_inode_ref, name_len, 16);
1588 BTRFS_SETGET_STACK_FUNCS(stack_inode_ref_name_len, struct btrfs_inode_ref, name_len, 16);
1589 BTRFS_SETGET_FUNCS(inode_ref_index, struct btrfs_inode_ref, index, 64);
1590
1591 /* struct btrfs_inode_extref */
1592 BTRFS_SETGET_FUNCS(inode_extref_parent, struct btrfs_inode_extref,
1593                    parent_objectid, 64);
1594 BTRFS_SETGET_FUNCS(inode_extref_name_len, struct btrfs_inode_extref,
1595                    name_len, 16);
1596 BTRFS_SETGET_FUNCS(inode_extref_index, struct btrfs_inode_extref, index, 64);
1597
1598 /* struct btrfs_inode_item */
1599 BTRFS_SETGET_FUNCS(inode_generation, struct btrfs_inode_item, generation, 64);
1600 BTRFS_SETGET_FUNCS(inode_sequence, struct btrfs_inode_item, sequence, 64);
1601 BTRFS_SETGET_FUNCS(inode_transid, struct btrfs_inode_item, transid, 64);
1602 BTRFS_SETGET_FUNCS(inode_size, struct btrfs_inode_item, size, 64);
1603 BTRFS_SETGET_FUNCS(inode_nbytes, struct btrfs_inode_item, nbytes, 64);
1604 BTRFS_SETGET_FUNCS(inode_block_group, struct btrfs_inode_item, block_group, 64);
1605 BTRFS_SETGET_FUNCS(inode_nlink, struct btrfs_inode_item, nlink, 32);
1606 BTRFS_SETGET_FUNCS(inode_uid, struct btrfs_inode_item, uid, 32);
1607 BTRFS_SETGET_FUNCS(inode_gid, struct btrfs_inode_item, gid, 32);
1608 BTRFS_SETGET_FUNCS(inode_mode, struct btrfs_inode_item, mode, 32);
1609 BTRFS_SETGET_FUNCS(inode_rdev, struct btrfs_inode_item, rdev, 64);
1610 BTRFS_SETGET_FUNCS(inode_flags, struct btrfs_inode_item, flags, 64);
1611
1612 BTRFS_SETGET_STACK_FUNCS(stack_inode_generation,
1613                          struct btrfs_inode_item, generation, 64);
1614 BTRFS_SETGET_STACK_FUNCS(stack_inode_sequence,
1615                          struct btrfs_inode_item, sequence, 64);
1616 BTRFS_SETGET_STACK_FUNCS(stack_inode_transid,
1617                          struct btrfs_inode_item, transid, 64);
1618 BTRFS_SETGET_STACK_FUNCS(stack_inode_size,
1619                          struct btrfs_inode_item, size, 64);
1620 BTRFS_SETGET_STACK_FUNCS(stack_inode_nbytes,
1621                          struct btrfs_inode_item, nbytes, 64);
1622 BTRFS_SETGET_STACK_FUNCS(stack_inode_block_group,
1623                          struct btrfs_inode_item, block_group, 64);
1624 BTRFS_SETGET_STACK_FUNCS(stack_inode_nlink,
1625                          struct btrfs_inode_item, nlink, 32);
1626 BTRFS_SETGET_STACK_FUNCS(stack_inode_uid,
1627                          struct btrfs_inode_item, uid, 32);
1628 BTRFS_SETGET_STACK_FUNCS(stack_inode_gid,
1629                          struct btrfs_inode_item, gid, 32);
1630 BTRFS_SETGET_STACK_FUNCS(stack_inode_mode,
1631                          struct btrfs_inode_item, mode, 32);
1632 BTRFS_SETGET_STACK_FUNCS(stack_inode_rdev,
1633                          struct btrfs_inode_item, rdev, 64);
1634 BTRFS_SETGET_STACK_FUNCS(stack_inode_flags,
1635                          struct btrfs_inode_item, flags, 64);
1636
1637 static inline struct btrfs_timespec *
1638 btrfs_inode_atime(struct btrfs_inode_item *inode_item)
1639 {
1640         unsigned long ptr = (unsigned long)inode_item;
1641         ptr += offsetof(struct btrfs_inode_item, atime);
1642         return (struct btrfs_timespec *)ptr;
1643 }
1644
1645 static inline struct btrfs_timespec *
1646 btrfs_inode_mtime(struct btrfs_inode_item *inode_item)
1647 {
1648         unsigned long ptr = (unsigned long)inode_item;
1649         ptr += offsetof(struct btrfs_inode_item, mtime);
1650         return (struct btrfs_timespec *)ptr;
1651 }
1652
1653 static inline struct btrfs_timespec *
1654 btrfs_inode_ctime(struct btrfs_inode_item *inode_item)
1655 {
1656         unsigned long ptr = (unsigned long)inode_item;
1657         ptr += offsetof(struct btrfs_inode_item, ctime);
1658         return (struct btrfs_timespec *)ptr;
1659 }
1660
1661 static inline struct btrfs_timespec *
1662 btrfs_inode_otime(struct btrfs_inode_item *inode_item)
1663 {
1664         unsigned long ptr = (unsigned long)inode_item;
1665         ptr += offsetof(struct btrfs_inode_item, otime);
1666         return (struct btrfs_timespec *)ptr;
1667 }
1668
1669 BTRFS_SETGET_FUNCS(timespec_sec, struct btrfs_timespec, sec, 64);
1670 BTRFS_SETGET_FUNCS(timespec_nsec, struct btrfs_timespec, nsec, 32);
1671 BTRFS_SETGET_STACK_FUNCS(stack_timespec_sec, struct btrfs_timespec,
1672                          sec, 64);
1673 BTRFS_SETGET_STACK_FUNCS(stack_timespec_nsec, struct btrfs_timespec,
1674                          nsec, 32);
1675
1676 /* struct btrfs_dev_extent */
1677 BTRFS_SETGET_FUNCS(dev_extent_chunk_tree, struct btrfs_dev_extent,
1678                    chunk_tree, 64);
1679 BTRFS_SETGET_FUNCS(dev_extent_chunk_objectid, struct btrfs_dev_extent,
1680                    chunk_objectid, 64);
1681 BTRFS_SETGET_FUNCS(dev_extent_chunk_offset, struct btrfs_dev_extent,
1682                    chunk_offset, 64);
1683 BTRFS_SETGET_FUNCS(dev_extent_length, struct btrfs_dev_extent, length, 64);
1684
1685 BTRFS_SETGET_STACK_FUNCS(stack_dev_extent_length, struct btrfs_dev_extent,
1686                          length, 64);
1687
1688 static inline u8 *btrfs_dev_extent_chunk_tree_uuid(struct btrfs_dev_extent *dev)
1689 {
1690         unsigned long ptr = offsetof(struct btrfs_dev_extent, chunk_tree_uuid);
1691         return (u8 *)((unsigned long)dev + ptr);
1692 }
1693
1694
1695 /* struct btrfs_extent_item */
1696 BTRFS_SETGET_FUNCS(extent_refs, struct btrfs_extent_item, refs, 64);
1697 BTRFS_SETGET_STACK_FUNCS(stack_extent_refs, struct btrfs_extent_item, refs, 64);
1698 BTRFS_SETGET_FUNCS(extent_generation, struct btrfs_extent_item,
1699                    generation, 64);
1700 BTRFS_SETGET_FUNCS(extent_flags, struct btrfs_extent_item, flags, 64);
1701 BTRFS_SETGET_STACK_FUNCS(stack_extent_flags, struct btrfs_extent_item, flags, 64);
1702
1703 BTRFS_SETGET_FUNCS(extent_refs_v0, struct btrfs_extent_item_v0, refs, 32);
1704
1705 BTRFS_SETGET_FUNCS(tree_block_level, struct btrfs_tree_block_info, level, 8);
1706
1707 static inline void btrfs_tree_block_key(struct extent_buffer *eb,
1708                                         struct btrfs_tree_block_info *item,
1709                                         struct btrfs_disk_key *key)
1710 {
1711         read_eb_member(eb, item, struct btrfs_tree_block_info, key, key);
1712 }
1713
1714 static inline void btrfs_set_tree_block_key(struct extent_buffer *eb,
1715                                             struct btrfs_tree_block_info *item,
1716                                             struct btrfs_disk_key *key)
1717 {
1718         write_eb_member(eb, item, struct btrfs_tree_block_info, key, key);
1719 }
1720
1721 BTRFS_SETGET_FUNCS(extent_data_ref_root, struct btrfs_extent_data_ref,
1722                    root, 64);
1723 BTRFS_SETGET_FUNCS(extent_data_ref_objectid, struct btrfs_extent_data_ref,
1724                    objectid, 64);
1725 BTRFS_SETGET_FUNCS(extent_data_ref_offset, struct btrfs_extent_data_ref,
1726                    offset, 64);
1727 BTRFS_SETGET_FUNCS(extent_data_ref_count, struct btrfs_extent_data_ref,
1728                    count, 32);
1729
1730 BTRFS_SETGET_FUNCS(shared_data_ref_count, struct btrfs_shared_data_ref,
1731                    count, 32);
1732
1733 BTRFS_SETGET_FUNCS(extent_inline_ref_type, struct btrfs_extent_inline_ref,
1734                    type, 8);
1735 BTRFS_SETGET_FUNCS(extent_inline_ref_offset, struct btrfs_extent_inline_ref,
1736                    offset, 64);
1737 BTRFS_SETGET_STACK_FUNCS(stack_extent_inline_ref_type,
1738                          struct btrfs_extent_inline_ref, type, 8);
1739 BTRFS_SETGET_STACK_FUNCS(stack_extent_inline_ref_offset,
1740                          struct btrfs_extent_inline_ref, offset, 64);
1741
1742 static inline u32 btrfs_extent_inline_ref_size(int type)
1743 {
1744         if (type == BTRFS_TREE_BLOCK_REF_KEY ||
1745             type == BTRFS_SHARED_BLOCK_REF_KEY)
1746                 return sizeof(struct btrfs_extent_inline_ref);
1747         if (type == BTRFS_SHARED_DATA_REF_KEY)
1748                 return sizeof(struct btrfs_shared_data_ref) +
1749                        sizeof(struct btrfs_extent_inline_ref);
1750         if (type == BTRFS_EXTENT_DATA_REF_KEY)
1751                 return sizeof(struct btrfs_extent_data_ref) +
1752                        offsetof(struct btrfs_extent_inline_ref, offset);
1753         BUG();
1754         return 0;
1755 }
1756
1757 BTRFS_SETGET_FUNCS(ref_root_v0, struct btrfs_extent_ref_v0, root, 64);
1758 BTRFS_SETGET_FUNCS(ref_generation_v0, struct btrfs_extent_ref_v0,
1759                    generation, 64);
1760 BTRFS_SETGET_FUNCS(ref_objectid_v0, struct btrfs_extent_ref_v0, objectid, 64);
1761 BTRFS_SETGET_FUNCS(ref_count_v0, struct btrfs_extent_ref_v0, count, 32);
1762
1763 /* struct btrfs_node */
1764 BTRFS_SETGET_FUNCS(key_blockptr, struct btrfs_key_ptr, blockptr, 64);
1765 BTRFS_SETGET_FUNCS(key_generation, struct btrfs_key_ptr, generation, 64);
1766
1767 static inline u64 btrfs_node_blockptr(struct extent_buffer *eb, int nr)
1768 {
1769         unsigned long ptr;
1770         ptr = offsetof(struct btrfs_node, ptrs) +
1771                 sizeof(struct btrfs_key_ptr) * nr;
1772         return btrfs_key_blockptr(eb, (struct btrfs_key_ptr *)ptr);
1773 }
1774
1775 static inline void btrfs_set_node_blockptr(struct extent_buffer *eb,
1776                                            int nr, u64 val)
1777 {
1778         unsigned long ptr;
1779         ptr = offsetof(struct btrfs_node, ptrs) +
1780                 sizeof(struct btrfs_key_ptr) * nr;
1781         btrfs_set_key_blockptr(eb, (struct btrfs_key_ptr *)ptr, val);
1782 }
1783
1784 static inline u64 btrfs_node_ptr_generation(struct extent_buffer *eb, int nr)
1785 {
1786         unsigned long ptr;
1787         ptr = offsetof(struct btrfs_node, ptrs) +
1788                 sizeof(struct btrfs_key_ptr) * nr;
1789         return btrfs_key_generation(eb, (struct btrfs_key_ptr *)ptr);
1790 }
1791
1792 static inline void btrfs_set_node_ptr_generation(struct extent_buffer *eb,
1793                                                  int nr, u64 val)
1794 {
1795         unsigned long ptr;
1796         ptr = offsetof(struct btrfs_node, ptrs) +
1797                 sizeof(struct btrfs_key_ptr) * nr;
1798         btrfs_set_key_generation(eb, (struct btrfs_key_ptr *)ptr, val);
1799 }
1800
1801 static inline unsigned long btrfs_node_key_ptr_offset(int nr)
1802 {
1803         return offsetof(struct btrfs_node, ptrs) +
1804                 sizeof(struct btrfs_key_ptr) * nr;
1805 }
1806
1807 static inline void btrfs_node_key(struct extent_buffer *eb,
1808                                   struct btrfs_disk_key *disk_key, int nr)
1809 {
1810         unsigned long ptr;
1811         ptr = btrfs_node_key_ptr_offset(nr);
1812         read_eb_member(eb, (struct btrfs_key_ptr *)ptr,
1813                        struct btrfs_key_ptr, key, disk_key);
1814 }
1815
1816 static inline void btrfs_set_node_key(struct extent_buffer *eb,
1817                                       struct btrfs_disk_key *disk_key, int nr)
1818 {
1819         unsigned long ptr;
1820         ptr = btrfs_node_key_ptr_offset(nr);
1821         write_eb_member(eb, (struct btrfs_key_ptr *)ptr,
1822                        struct btrfs_key_ptr, key, disk_key);
1823 }
1824
1825 /* struct btrfs_item */
1826 BTRFS_SETGET_FUNCS(item_offset, struct btrfs_item, offset, 32);
1827 BTRFS_SETGET_FUNCS(item_size, struct btrfs_item, size, 32);
1828
1829 static inline unsigned long btrfs_item_nr_offset(int nr)
1830 {
1831         return offsetof(struct btrfs_leaf, items) +
1832                 sizeof(struct btrfs_item) * nr;
1833 }
1834
1835 static inline struct btrfs_item *btrfs_item_nr(int nr)
1836 {
1837         return (struct btrfs_item *)btrfs_item_nr_offset(nr);
1838 }
1839
1840 static inline u32 btrfs_item_end(struct extent_buffer *eb,
1841                                  struct btrfs_item *item)
1842 {
1843         return btrfs_item_offset(eb, item) + btrfs_item_size(eb, item);
1844 }
1845
1846 static inline u32 btrfs_item_end_nr(struct extent_buffer *eb, int nr)
1847 {
1848         return btrfs_item_end(eb, btrfs_item_nr(nr));
1849 }
1850
1851 static inline u32 btrfs_item_offset_nr(struct extent_buffer *eb, int nr)
1852 {
1853         return btrfs_item_offset(eb, btrfs_item_nr(nr));
1854 }
1855
1856 static inline u32 btrfs_item_size_nr(struct extent_buffer *eb, int nr)
1857 {
1858         return btrfs_item_size(eb, btrfs_item_nr(nr));
1859 }
1860
1861 static inline void btrfs_item_key(struct extent_buffer *eb,
1862                            struct btrfs_disk_key *disk_key, int nr)
1863 {
1864         struct btrfs_item *item = btrfs_item_nr(nr);
1865         read_eb_member(eb, item, struct btrfs_item, key, disk_key);
1866 }
1867
1868 static inline void btrfs_set_item_key(struct extent_buffer *eb,
1869                                struct btrfs_disk_key *disk_key, int nr)
1870 {
1871         struct btrfs_item *item = btrfs_item_nr(nr);
1872         write_eb_member(eb, item, struct btrfs_item, key, disk_key);
1873 }
1874
1875 BTRFS_SETGET_FUNCS(dir_log_end, struct btrfs_dir_log_item, end, 64);
1876
1877 /*
1878  * struct btrfs_root_ref
1879  */
1880 BTRFS_SETGET_FUNCS(root_ref_dirid, struct btrfs_root_ref, dirid, 64);
1881 BTRFS_SETGET_FUNCS(root_ref_sequence, struct btrfs_root_ref, sequence, 64);
1882 BTRFS_SETGET_FUNCS(root_ref_name_len, struct btrfs_root_ref, name_len, 16);
1883
1884 BTRFS_SETGET_STACK_FUNCS(stack_root_ref_dirid, struct btrfs_root_ref, dirid, 64);
1885 BTRFS_SETGET_STACK_FUNCS(stack_root_ref_sequence, struct btrfs_root_ref, sequence, 64);
1886 BTRFS_SETGET_STACK_FUNCS(stack_root_ref_name_len, struct btrfs_root_ref, name_len, 16);
1887
1888 /* struct btrfs_dir_item */
1889 BTRFS_SETGET_FUNCS(dir_data_len, struct btrfs_dir_item, data_len, 16);
1890 BTRFS_SETGET_FUNCS(dir_type, struct btrfs_dir_item, type, 8);
1891 BTRFS_SETGET_FUNCS(dir_name_len, struct btrfs_dir_item, name_len, 16);
1892 BTRFS_SETGET_FUNCS(dir_transid, struct btrfs_dir_item, transid, 64);
1893
1894 BTRFS_SETGET_STACK_FUNCS(stack_dir_data_len, struct btrfs_dir_item, data_len, 16);
1895 BTRFS_SETGET_STACK_FUNCS(stack_dir_type, struct btrfs_dir_item, type, 8);
1896 BTRFS_SETGET_STACK_FUNCS(stack_dir_name_len, struct btrfs_dir_item, name_len, 16);
1897 BTRFS_SETGET_STACK_FUNCS(stack_dir_transid, struct btrfs_dir_item, transid, 64);
1898
1899 static inline void btrfs_dir_item_key(struct extent_buffer *eb,
1900                                       struct btrfs_dir_item *item,
1901                                       struct btrfs_disk_key *key)
1902 {
1903         read_eb_member(eb, item, struct btrfs_dir_item, location, key);
1904 }
1905
1906 static inline void btrfs_set_dir_item_key(struct extent_buffer *eb,
1907                                           struct btrfs_dir_item *item,
1908                                           struct btrfs_disk_key *key)
1909 {
1910         write_eb_member(eb, item, struct btrfs_dir_item, location, key);
1911 }
1912
1913 /* struct btrfs_free_space_header */
1914 BTRFS_SETGET_FUNCS(free_space_entries, struct btrfs_free_space_header,
1915                    num_entries, 64);
1916 BTRFS_SETGET_FUNCS(free_space_bitmaps, struct btrfs_free_space_header,
1917                    num_bitmaps, 64);
1918 BTRFS_SETGET_FUNCS(free_space_generation, struct btrfs_free_space_header,
1919                    generation, 64);
1920
1921 static inline void btrfs_free_space_key(struct extent_buffer *eb,
1922                                         struct btrfs_free_space_header *h,
1923                                         struct btrfs_disk_key *key)
1924 {
1925         read_eb_member(eb, h, struct btrfs_free_space_header, location, key);
1926 }
1927
1928 static inline void btrfs_set_free_space_key(struct extent_buffer *eb,
1929                                             struct btrfs_free_space_header *h,
1930                                             struct btrfs_disk_key *key)
1931 {
1932         write_eb_member(eb, h, struct btrfs_free_space_header, location, key);
1933 }
1934
1935 /* struct btrfs_disk_key */
1936 BTRFS_SETGET_STACK_FUNCS(disk_key_objectid, struct btrfs_disk_key,
1937                          objectid, 64);
1938 BTRFS_SETGET_STACK_FUNCS(disk_key_offset, struct btrfs_disk_key, offset, 64);
1939 BTRFS_SETGET_STACK_FUNCS(disk_key_type, struct btrfs_disk_key, type, 8);
1940
1941 static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu,
1942                                          struct btrfs_disk_key *disk)
1943 {
1944         cpu->offset = le64_to_cpu(disk->offset);
1945         cpu->type = disk->type;
1946         cpu->objectid = le64_to_cpu(disk->objectid);
1947 }
1948
1949 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk,
1950                                          struct btrfs_key *cpu)
1951 {
1952         disk->offset = cpu_to_le64(cpu->offset);
1953         disk->type = cpu->type;
1954         disk->objectid = cpu_to_le64(cpu->objectid);
1955 }
1956
1957 static inline void btrfs_node_key_to_cpu(struct extent_buffer *eb,
1958                                   struct btrfs_key *key, int nr)
1959 {
1960         struct btrfs_disk_key disk_key;
1961         btrfs_node_key(eb, &disk_key, nr);
1962         btrfs_disk_key_to_cpu(key, &disk_key);
1963 }
1964
1965 static inline void btrfs_item_key_to_cpu(struct extent_buffer *eb,
1966                                   struct btrfs_key *key, int nr)
1967 {
1968         struct btrfs_disk_key disk_key;
1969         btrfs_item_key(eb, &disk_key, nr);
1970         btrfs_disk_key_to_cpu(key, &disk_key);
1971 }
1972
1973 static inline void btrfs_dir_item_key_to_cpu(struct extent_buffer *eb,
1974                                       struct btrfs_dir_item *item,
1975                                       struct btrfs_key *key)
1976 {
1977         struct btrfs_disk_key disk_key;
1978         btrfs_dir_item_key(eb, item, &disk_key);
1979         btrfs_disk_key_to_cpu(key, &disk_key);
1980 }
1981
1982 /* struct btrfs_header */
1983 BTRFS_SETGET_HEADER_FUNCS(header_bytenr, struct btrfs_header, bytenr, 64);
1984 BTRFS_SETGET_HEADER_FUNCS(header_generation, struct btrfs_header,
1985                           generation, 64);
1986 BTRFS_SETGET_HEADER_FUNCS(header_owner, struct btrfs_header, owner, 64);
1987 BTRFS_SETGET_HEADER_FUNCS(header_nritems, struct btrfs_header, nritems, 32);
1988 BTRFS_SETGET_HEADER_FUNCS(header_flags, struct btrfs_header, flags, 64);
1989 BTRFS_SETGET_HEADER_FUNCS(header_level, struct btrfs_header, level, 8);
1990 BTRFS_SETGET_STACK_FUNCS(stack_header_bytenr, struct btrfs_header, bytenr, 64);
1991 BTRFS_SETGET_STACK_FUNCS(stack_header_nritems, struct btrfs_header, nritems,
1992                          32);
1993 BTRFS_SETGET_STACK_FUNCS(stack_header_owner, struct btrfs_header, owner, 64);
1994 BTRFS_SETGET_STACK_FUNCS(stack_header_generation, struct btrfs_header,
1995                          generation, 64);
1996
1997 static inline int btrfs_header_flag(struct extent_buffer *eb, u64 flag)
1998 {
1999         return (btrfs_header_flags(eb) & flag) == flag;
2000 }
2001
2002 static inline int btrfs_set_header_flag(struct extent_buffer *eb, u64 flag)
2003 {
2004         u64 flags = btrfs_header_flags(eb);
2005         btrfs_set_header_flags(eb, flags | flag);
2006         return (flags & flag) == flag;
2007 }
2008
2009 static inline int btrfs_clear_header_flag(struct extent_buffer *eb, u64 flag)
2010 {
2011         u64 flags = btrfs_header_flags(eb);
2012         btrfs_set_header_flags(eb, flags & ~flag);
2013         return (flags & flag) == flag;
2014 }
2015
2016 static inline int btrfs_header_backref_rev(struct extent_buffer *eb)
2017 {
2018         u64 flags = btrfs_header_flags(eb);
2019         return flags >> BTRFS_BACKREF_REV_SHIFT;
2020 }
2021
2022 static inline void btrfs_set_header_backref_rev(struct extent_buffer *eb,
2023                                                 int rev)
2024 {
2025         u64 flags = btrfs_header_flags(eb);
2026         flags &= ~BTRFS_BACKREF_REV_MASK;
2027         flags |= (u64)rev << BTRFS_BACKREF_REV_SHIFT;
2028         btrfs_set_header_flags(eb, flags);
2029 }
2030
2031 static inline unsigned long btrfs_header_fsid(void)
2032 {
2033         return offsetof(struct btrfs_header, fsid);
2034 }
2035
2036 static inline unsigned long btrfs_header_chunk_tree_uuid(struct extent_buffer *eb)
2037 {
2038         return offsetof(struct btrfs_header, chunk_tree_uuid);
2039 }
2040
2041 static inline u8 *btrfs_super_fsid(struct extent_buffer *eb)
2042 {
2043         unsigned long ptr = offsetof(struct btrfs_super_block, fsid);
2044         return (u8 *)ptr;
2045 }
2046
2047 static inline u8 *btrfs_header_csum(struct extent_buffer *eb)
2048 {
2049         unsigned long ptr = offsetof(struct btrfs_header, csum);
2050         return (u8 *)ptr;
2051 }
2052
2053 static inline struct btrfs_node *btrfs_buffer_node(struct extent_buffer *eb)
2054 {
2055         return NULL;
2056 }
2057
2058 static inline struct btrfs_leaf *btrfs_buffer_leaf(struct extent_buffer *eb)
2059 {
2060         return NULL;
2061 }
2062
2063 static inline struct btrfs_header *btrfs_buffer_header(struct extent_buffer *eb)
2064 {
2065         return NULL;
2066 }
2067
2068 static inline int btrfs_is_leaf(struct extent_buffer *eb)
2069 {
2070         return (btrfs_header_level(eb) == 0);
2071 }
2072
2073 /* struct btrfs_root_item */
2074 BTRFS_SETGET_FUNCS(disk_root_generation, struct btrfs_root_item,
2075                    generation, 64);
2076 BTRFS_SETGET_FUNCS(disk_root_refs, struct btrfs_root_item, refs, 32);
2077 BTRFS_SETGET_FUNCS(disk_root_bytenr, struct btrfs_root_item, bytenr, 64);
2078 BTRFS_SETGET_FUNCS(disk_root_level, struct btrfs_root_item, level, 8);
2079
2080 BTRFS_SETGET_STACK_FUNCS(root_generation, struct btrfs_root_item,
2081                          generation, 64);
2082 BTRFS_SETGET_STACK_FUNCS(root_bytenr, struct btrfs_root_item, bytenr, 64);
2083 BTRFS_SETGET_STACK_FUNCS(root_level, struct btrfs_root_item, level, 8);
2084 BTRFS_SETGET_STACK_FUNCS(root_dirid, struct btrfs_root_item, root_dirid, 64);
2085 BTRFS_SETGET_STACK_FUNCS(root_refs, struct btrfs_root_item, refs, 32);
2086 BTRFS_SETGET_STACK_FUNCS(root_flags, struct btrfs_root_item, flags, 64);
2087 BTRFS_SETGET_STACK_FUNCS(root_used, struct btrfs_root_item, bytes_used, 64);
2088 BTRFS_SETGET_STACK_FUNCS(root_limit, struct btrfs_root_item, byte_limit, 64);
2089 BTRFS_SETGET_STACK_FUNCS(root_last_snapshot, struct btrfs_root_item,
2090                          last_snapshot, 64);
2091 BTRFS_SETGET_STACK_FUNCS(root_generation_v2, struct btrfs_root_item,
2092                          generation_v2, 64);
2093 BTRFS_SETGET_STACK_FUNCS(root_ctransid, struct btrfs_root_item,
2094                          ctransid, 64);
2095 BTRFS_SETGET_STACK_FUNCS(root_otransid, struct btrfs_root_item,
2096                          otransid, 64);
2097 BTRFS_SETGET_STACK_FUNCS(root_stransid, struct btrfs_root_item,
2098                          stransid, 64);
2099 BTRFS_SETGET_STACK_FUNCS(root_rtransid, struct btrfs_root_item,
2100                          rtransid, 64);
2101
2102 /* struct btrfs_root_backup */
2103 BTRFS_SETGET_STACK_FUNCS(backup_tree_root, struct btrfs_root_backup,
2104                    tree_root, 64);
2105 BTRFS_SETGET_STACK_FUNCS(backup_tree_root_gen, struct btrfs_root_backup,
2106                    tree_root_gen, 64);
2107 BTRFS_SETGET_STACK_FUNCS(backup_tree_root_level, struct btrfs_root_backup,
2108                    tree_root_level, 8);
2109
2110 BTRFS_SETGET_STACK_FUNCS(backup_chunk_root, struct btrfs_root_backup,
2111                    chunk_root, 64);
2112 BTRFS_SETGET_STACK_FUNCS(backup_chunk_root_gen, struct btrfs_root_backup,
2113                    chunk_root_gen, 64);
2114 BTRFS_SETGET_STACK_FUNCS(backup_chunk_root_level, struct btrfs_root_backup,
2115                    chunk_root_level, 8);
2116
2117 BTRFS_SETGET_STACK_FUNCS(backup_extent_root, struct btrfs_root_backup,
2118                    extent_root, 64);
2119 BTRFS_SETGET_STACK_FUNCS(backup_extent_root_gen, struct btrfs_root_backup,
2120                    extent_root_gen, 64);
2121 BTRFS_SETGET_STACK_FUNCS(backup_extent_root_level, struct btrfs_root_backup,
2122                    extent_root_level, 8);
2123
2124 BTRFS_SETGET_STACK_FUNCS(backup_fs_root, struct btrfs_root_backup,
2125                    fs_root, 64);
2126 BTRFS_SETGET_STACK_FUNCS(backup_fs_root_gen, struct btrfs_root_backup,
2127                    fs_root_gen, 64);
2128 BTRFS_SETGET_STACK_FUNCS(backup_fs_root_level, struct btrfs_root_backup,
2129                    fs_root_level, 8);
2130
2131 BTRFS_SETGET_STACK_FUNCS(backup_dev_root, struct btrfs_root_backup,
2132                    dev_root, 64);
2133 BTRFS_SETGET_STACK_FUNCS(backup_dev_root_gen, struct btrfs_root_backup,
2134                    dev_root_gen, 64);
2135 BTRFS_SETGET_STACK_FUNCS(backup_dev_root_level, struct btrfs_root_backup,
2136                    dev_root_level, 8);
2137
2138 BTRFS_SETGET_STACK_FUNCS(backup_csum_root, struct btrfs_root_backup,
2139                    csum_root, 64);
2140 BTRFS_SETGET_STACK_FUNCS(backup_csum_root_gen, struct btrfs_root_backup,
2141                    csum_root_gen, 64);
2142 BTRFS_SETGET_STACK_FUNCS(backup_csum_root_level, struct btrfs_root_backup,
2143                    csum_root_level, 8);
2144 BTRFS_SETGET_STACK_FUNCS(backup_total_bytes, struct btrfs_root_backup,
2145                    total_bytes, 64);
2146 BTRFS_SETGET_STACK_FUNCS(backup_bytes_used, struct btrfs_root_backup,
2147                    bytes_used, 64);
2148 BTRFS_SETGET_STACK_FUNCS(backup_num_devices, struct btrfs_root_backup,
2149                    num_devices, 64);
2150
2151 /* struct btrfs_super_block */
2152
2153 BTRFS_SETGET_STACK_FUNCS(super_bytenr, struct btrfs_super_block, bytenr, 64);
2154 BTRFS_SETGET_STACK_FUNCS(super_flags, struct btrfs_super_block, flags, 64);
2155 BTRFS_SETGET_STACK_FUNCS(super_generation, struct btrfs_super_block,
2156                          generation, 64);
2157 BTRFS_SETGET_STACK_FUNCS(super_root, struct btrfs_super_block, root, 64);
2158 BTRFS_SETGET_STACK_FUNCS(super_sys_array_size,
2159                          struct btrfs_super_block, sys_chunk_array_size, 32);
2160 BTRFS_SETGET_STACK_FUNCS(super_chunk_root_generation,
2161                          struct btrfs_super_block, chunk_root_generation, 64);
2162 BTRFS_SETGET_STACK_FUNCS(super_root_level, struct btrfs_super_block,
2163                          root_level, 8);
2164 BTRFS_SETGET_STACK_FUNCS(super_chunk_root, struct btrfs_super_block,
2165                          chunk_root, 64);
2166 BTRFS_SETGET_STACK_FUNCS(super_chunk_root_level, struct btrfs_super_block,
2167                          chunk_root_level, 8);
2168 BTRFS_SETGET_STACK_FUNCS(super_log_root, struct btrfs_super_block,
2169                          log_root, 64);
2170 BTRFS_SETGET_STACK_FUNCS(super_log_root_transid, struct btrfs_super_block,
2171                          log_root_transid, 64);
2172 BTRFS_SETGET_STACK_FUNCS(super_log_root_level, struct btrfs_super_block,
2173                          log_root_level, 8);
2174 BTRFS_SETGET_STACK_FUNCS(super_total_bytes, struct btrfs_super_block,
2175                          total_bytes, 64);
2176 BTRFS_SETGET_STACK_FUNCS(super_bytes_used, struct btrfs_super_block,
2177                          bytes_used, 64);
2178 BTRFS_SETGET_STACK_FUNCS(super_sectorsize, struct btrfs_super_block,
2179                          sectorsize, 32);
2180 BTRFS_SETGET_STACK_FUNCS(super_nodesize, struct btrfs_super_block,
2181                          nodesize, 32);
2182 BTRFS_SETGET_STACK_FUNCS(super_leafsize, struct btrfs_super_block,
2183                          leafsize, 32);
2184 BTRFS_SETGET_STACK_FUNCS(super_stripesize, struct btrfs_super_block,
2185                          stripesize, 32);
2186 BTRFS_SETGET_STACK_FUNCS(super_root_dir, struct btrfs_super_block,
2187                          root_dir_objectid, 64);
2188 BTRFS_SETGET_STACK_FUNCS(super_num_devices, struct btrfs_super_block,
2189                          num_devices, 64);
2190 BTRFS_SETGET_STACK_FUNCS(super_compat_flags, struct btrfs_super_block,
2191                          compat_flags, 64);
2192 BTRFS_SETGET_STACK_FUNCS(super_compat_ro_flags, struct btrfs_super_block,
2193                          compat_ro_flags, 64);
2194 BTRFS_SETGET_STACK_FUNCS(super_incompat_flags, struct btrfs_super_block,
2195                          incompat_flags, 64);
2196 BTRFS_SETGET_STACK_FUNCS(super_csum_type, struct btrfs_super_block,
2197                          csum_type, 16);
2198 BTRFS_SETGET_STACK_FUNCS(super_cache_generation, struct btrfs_super_block,
2199                          cache_generation, 64);
2200 BTRFS_SETGET_STACK_FUNCS(super_uuid_tree_generation, struct btrfs_super_block,
2201                          uuid_tree_generation, 64);
2202 BTRFS_SETGET_STACK_FUNCS(super_magic, struct btrfs_super_block, magic, 64);
2203
2204 static inline int btrfs_super_csum_size(struct btrfs_super_block *s)
2205 {
2206         int t = btrfs_super_csum_type(s);
2207         BUG_ON(t >= ARRAY_SIZE(btrfs_csum_sizes));
2208         return btrfs_csum_sizes[t];
2209 }
2210
2211 static inline unsigned long btrfs_leaf_data(struct extent_buffer *l)
2212 {
2213         return offsetof(struct btrfs_leaf, items);
2214 }
2215
2216 /* struct btrfs_file_extent_item */
2217 BTRFS_SETGET_FUNCS(file_extent_type, struct btrfs_file_extent_item, type, 8);
2218 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_type, struct btrfs_file_extent_item, type, 8);
2219
2220 static inline unsigned long btrfs_file_extent_inline_start(struct
2221                                                    btrfs_file_extent_item *e)
2222 {
2223         unsigned long offset = (unsigned long)e;
2224         offset += offsetof(struct btrfs_file_extent_item, disk_bytenr);
2225         return offset;
2226 }
2227
2228 static inline u32 btrfs_file_extent_calc_inline_size(u32 datasize)
2229 {
2230         return offsetof(struct btrfs_file_extent_item, disk_bytenr) + datasize;
2231 }
2232
2233 BTRFS_SETGET_FUNCS(file_extent_disk_bytenr, struct btrfs_file_extent_item,
2234                    disk_bytenr, 64);
2235 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_disk_bytenr, struct btrfs_file_extent_item,
2236                    disk_bytenr, 64);
2237 BTRFS_SETGET_FUNCS(file_extent_generation, struct btrfs_file_extent_item,
2238                    generation, 64);
2239 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_generation, struct btrfs_file_extent_item,
2240                    generation, 64);
2241 BTRFS_SETGET_FUNCS(file_extent_disk_num_bytes, struct btrfs_file_extent_item,
2242                    disk_num_bytes, 64);
2243 BTRFS_SETGET_FUNCS(file_extent_offset, struct btrfs_file_extent_item,
2244                   offset, 64);
2245 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_offset, struct btrfs_file_extent_item,
2246                   offset, 64);
2247 BTRFS_SETGET_FUNCS(file_extent_num_bytes, struct btrfs_file_extent_item,
2248                    num_bytes, 64);
2249 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_num_bytes, struct btrfs_file_extent_item,
2250                    num_bytes, 64);
2251 BTRFS_SETGET_FUNCS(file_extent_ram_bytes, struct btrfs_file_extent_item,
2252                    ram_bytes, 64);
2253 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_ram_bytes, struct btrfs_file_extent_item,
2254                    ram_bytes, 64);
2255 BTRFS_SETGET_FUNCS(file_extent_compression, struct btrfs_file_extent_item,
2256                    compression, 8);
2257 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_compression, struct btrfs_file_extent_item,
2258                    compression, 8);
2259 BTRFS_SETGET_FUNCS(file_extent_encryption, struct btrfs_file_extent_item,
2260                    encryption, 8);
2261 BTRFS_SETGET_FUNCS(file_extent_other_encoding, struct btrfs_file_extent_item,
2262                    other_encoding, 16);
2263
2264 /* btrfs_qgroup_status_item */
2265 BTRFS_SETGET_FUNCS(qgroup_status_version, struct btrfs_qgroup_status_item,
2266                    version, 64);
2267 BTRFS_SETGET_FUNCS(qgroup_status_generation, struct btrfs_qgroup_status_item,
2268                    generation, 64);
2269 BTRFS_SETGET_FUNCS(qgroup_status_flags, struct btrfs_qgroup_status_item,
2270                    flags, 64);
2271 BTRFS_SETGET_FUNCS(qgroup_status_rescan, struct btrfs_qgroup_status_item,
2272                    rescan, 64);
2273
2274 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_status_version,
2275                          struct btrfs_qgroup_status_item, version, 64);
2276 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_status_generation,
2277                          struct btrfs_qgroup_status_item, generation, 64);
2278 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_status_flags,
2279                          struct btrfs_qgroup_status_item, flags, 64);
2280 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_status_rescan,
2281                          struct btrfs_qgroup_status_item, rescan, 64);
2282
2283 /* btrfs_qgroup_info_item */
2284 BTRFS_SETGET_FUNCS(qgroup_info_generation, struct btrfs_qgroup_info_item,
2285                    generation, 64);
2286 BTRFS_SETGET_FUNCS(qgroup_info_referenced, struct btrfs_qgroup_info_item,
2287                    referenced, 64);
2288 BTRFS_SETGET_FUNCS(qgroup_info_referenced_compressed,
2289                    struct btrfs_qgroup_info_item, referenced_compressed, 64);
2290 BTRFS_SETGET_FUNCS(qgroup_info_exclusive, struct btrfs_qgroup_info_item,
2291                    exclusive, 64);
2292 BTRFS_SETGET_FUNCS(qgroup_info_exclusive_compressed,
2293                    struct btrfs_qgroup_info_item, exclusive_compressed, 64);
2294
2295 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_generation,
2296                          struct btrfs_qgroup_info_item, generation, 64);
2297 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_referenced,
2298                          struct btrfs_qgroup_info_item, referenced, 64);
2299 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_referenced_compressed,
2300                    struct btrfs_qgroup_info_item, referenced_compressed, 64);
2301 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_exclusive,
2302                          struct btrfs_qgroup_info_item, exclusive, 64);
2303 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_exclusive_compressed,
2304                    struct btrfs_qgroup_info_item, exclusive_compressed, 64);
2305
2306 /* btrfs_qgroup_limit_item */
2307 BTRFS_SETGET_FUNCS(qgroup_limit_flags, struct btrfs_qgroup_limit_item,
2308                    flags, 64);
2309 BTRFS_SETGET_FUNCS(qgroup_limit_max_referenced, struct btrfs_qgroup_limit_item,
2310                    max_referenced, 64);
2311 BTRFS_SETGET_FUNCS(qgroup_limit_max_exclusive, struct btrfs_qgroup_limit_item,
2312                    max_exclusive, 64);
2313 BTRFS_SETGET_FUNCS(qgroup_limit_rsv_referenced, struct btrfs_qgroup_limit_item,
2314                    rsv_referenced, 64);
2315 BTRFS_SETGET_FUNCS(qgroup_limit_rsv_exclusive, struct btrfs_qgroup_limit_item,
2316                    rsv_exclusive, 64);
2317
2318 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_limit_flags,
2319                          struct btrfs_qgroup_limit_item, flags, 64);
2320 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_limit_max_referenced,
2321                          struct btrfs_qgroup_limit_item, max_referenced, 64);
2322 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_limit_max_exclusive,
2323                          struct btrfs_qgroup_limit_item, max_exclusive, 64);
2324 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_limit_rsv_referenced,
2325                          struct btrfs_qgroup_limit_item, rsv_referenced, 64);
2326 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_limit_rsv_exclusive,
2327                          struct btrfs_qgroup_limit_item, rsv_exclusive, 64);
2328
2329 /* btrfs_balance_item */
2330 BTRFS_SETGET_FUNCS(balance_item_flags, struct btrfs_balance_item, flags, 64);
2331
2332 static inline struct btrfs_disk_balance_args* btrfs_balance_item_data(
2333                 struct extent_buffer *eb, struct btrfs_balance_item *bi)
2334 {
2335         unsigned long offset = (unsigned long)bi;
2336         struct btrfs_balance_item *p;
2337         p = (struct btrfs_balance_item *)(eb->data + offset);
2338         return &p->data;
2339 }
2340
2341 static inline struct btrfs_disk_balance_args* btrfs_balance_item_meta(
2342                 struct extent_buffer *eb, struct btrfs_balance_item *bi)
2343 {
2344         unsigned long offset = (unsigned long)bi;
2345         struct btrfs_balance_item *p;
2346         p = (struct btrfs_balance_item *)(eb->data + offset);
2347         return &p->meta;
2348 }
2349
2350 static inline struct btrfs_disk_balance_args* btrfs_balance_item_sys(
2351                 struct extent_buffer *eb, struct btrfs_balance_item *bi)
2352 {
2353         unsigned long offset = (unsigned long)bi;
2354         struct btrfs_balance_item *p;
2355         p = (struct btrfs_balance_item *)(eb->data + offset);
2356         return &p->sys;
2357 }
2358
2359 /*
2360  * btrfs_dev_stats_item helper, returns pointer to the raw array, do the
2361  * endiannes conversion, @dsi is offset to eb data
2362  */
2363 static inline __le64* btrfs_dev_stats_values(struct extent_buffer *eb,
2364                 struct btrfs_dev_stats_item *dsi)
2365 {
2366         unsigned long offset = (unsigned long)dsi;
2367         struct btrfs_dev_stats_item *p;
2368         p = (struct btrfs_dev_stats_item *)(eb->data + offset);
2369         return p->values;
2370 }
2371
2372 /*
2373  * this returns the number of bytes used by the item on disk, minus the
2374  * size of any extent headers.  If a file is compressed on disk, this is
2375  * the compressed size
2376  */
2377 static inline u32 btrfs_file_extent_inline_item_len(struct extent_buffer *eb,
2378                                                     struct btrfs_item *e)
2379 {
2380        unsigned long offset;
2381        offset = offsetof(struct btrfs_file_extent_item, disk_bytenr);
2382        return btrfs_item_size(eb, e) - offset;
2383 }
2384
2385 /* struct btrfs_ioctl_search_header */
2386 static inline u64 btrfs_search_header_transid(struct btrfs_ioctl_search_header *sh)
2387 {
2388         return get_unaligned_64(&sh->transid);
2389 }
2390
2391 static inline u64 btrfs_search_header_objectid(struct btrfs_ioctl_search_header *sh)
2392 {
2393         return get_unaligned_64(&sh->objectid);
2394 }
2395
2396 static inline u64 btrfs_search_header_offset(struct btrfs_ioctl_search_header *sh)
2397 {
2398         return get_unaligned_64(&sh->offset);
2399 }
2400
2401 static inline u32 btrfs_search_header_type(struct btrfs_ioctl_search_header *sh)
2402 {
2403         return get_unaligned_32(&sh->type);
2404 }
2405
2406 static inline u32 btrfs_search_header_len(struct btrfs_ioctl_search_header *sh)
2407 {
2408         return get_unaligned_32(&sh->len);
2409 }
2410
2411 /* this returns the number of file bytes represented by the inline item.
2412  * If an item is compressed, this is the uncompressed size
2413  */
2414 static inline u32 btrfs_file_extent_inline_len(struct extent_buffer *eb,
2415                                                int slot,
2416                                                struct btrfs_file_extent_item *fi)
2417 {
2418         /*
2419          * return the space used on disk if this item isn't
2420          * compressed or encoded
2421          */
2422         if (btrfs_file_extent_compression(eb, fi) == 0 &&
2423             btrfs_file_extent_encryption(eb, fi) == 0 &&
2424             btrfs_file_extent_other_encoding(eb, fi) == 0) {
2425                 return btrfs_file_extent_inline_item_len(eb,
2426                                                          btrfs_item_nr(slot));
2427         }
2428
2429         /* otherwise use the ram bytes field */
2430         return btrfs_file_extent_ram_bytes(eb, fi);
2431 }
2432
2433 /*
2434  * NOTE: Backward compatibility, do not use.
2435  * Replacement: read nodesize directly
2436  */
2437 __attribute__((deprecated))
2438 static inline u32 btrfs_level_size(struct btrfs_root *root, int level) {
2439         if (level == 0)
2440                 return root->leafsize;
2441         return root->nodesize;
2442 }
2443
2444 static inline int btrfs_fs_incompat(struct btrfs_fs_info *fs_info, u64 flag)
2445 {
2446         struct btrfs_super_block *disk_super;
2447         disk_super = fs_info->super_copy;
2448         return !!(btrfs_super_incompat_flags(disk_super) & flag);
2449 }
2450
2451 static inline int btrfs_fs_compat_ro(struct btrfs_fs_info *fs_info, u64 flag)
2452 {
2453         struct btrfs_super_block *disk_super;
2454         disk_super = fs_info->super_copy;
2455         return !!(btrfs_super_compat_ro_flags(disk_super) & flag);
2456 }
2457
2458 /* helper function to cast into the data area of the leaf. */
2459 #define btrfs_item_ptr(leaf, slot, type) \
2460         ((type *)(btrfs_leaf_data(leaf) + \
2461         btrfs_item_offset_nr(leaf, slot)))
2462
2463 #define btrfs_item_ptr_offset(leaf, slot) \
2464         ((unsigned long)(btrfs_leaf_data(leaf) + \
2465         btrfs_item_offset_nr(leaf, slot)))
2466
2467 /* extent-tree.c */
2468 int btrfs_reserve_extent(struct btrfs_trans_handle *trans,
2469                          struct btrfs_root *root,
2470                          u64 num_bytes, u64 empty_size,
2471                          u64 hint_byte, u64 search_end,
2472                          struct btrfs_key *ins, int data);
2473 int btrfs_fix_block_accounting(struct btrfs_trans_handle *trans,
2474                                  struct btrfs_root *root);
2475 void btrfs_pin_extent(struct btrfs_fs_info *fs_info, u64 bytenr, u64 num_bytes);
2476 void btrfs_unpin_extent(struct btrfs_fs_info *fs_info,
2477                         u64 bytenr, u64 num_bytes);
2478 int btrfs_extent_post_op(struct btrfs_trans_handle *trans,
2479                          struct btrfs_root *root);
2480 struct btrfs_block_group_cache *btrfs_lookup_block_group(struct
2481                                                          btrfs_fs_info *info,
2482                                                          u64 bytenr);
2483 struct btrfs_block_group_cache *btrfs_lookup_first_block_group(struct
2484                                                        btrfs_fs_info *info,
2485                                                        u64 bytenr);
2486 struct extent_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
2487                                         struct btrfs_root *root,
2488                                         u32 blocksize, u64 root_objectid,
2489                                         struct btrfs_disk_key *key, int level,
2490                                         u64 hint, u64 empty_size);
2491 int btrfs_alloc_extent(struct btrfs_trans_handle *trans,
2492                        struct btrfs_root *root,
2493                        u64 num_bytes, u64 parent,
2494                        u64 root_objectid, u64 ref_generation,
2495                        u64 owner, u64 empty_size, u64 hint_byte,
2496                        u64 search_end, struct btrfs_key *ins, int data);
2497 int btrfs_lookup_extent_info(struct btrfs_trans_handle *trans,
2498                              struct btrfs_root *root, u64 bytenr,
2499                              u64 offset, int metadata, u64 *refs, u64 *flags);
2500 int btrfs_set_block_flags(struct btrfs_trans_handle *trans,
2501                           struct btrfs_root *root,
2502                           u64 bytenr, int level, u64 flags);
2503 int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2504                   struct extent_buffer *buf, int record_parent);
2505 int btrfs_dec_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2506                   struct extent_buffer *buf, int record_parent);
2507 int btrfs_free_extent(struct btrfs_trans_handle *trans,
2508                       struct btrfs_root *root,
2509                       u64 bytenr, u64 num_bytes, u64 parent,
2510                       u64 root_objectid, u64 owner, u64 offset);
2511 int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans,
2512                                struct btrfs_root *root,
2513                                struct extent_io_tree *unpin);
2514 int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
2515                                 struct btrfs_root *root,
2516                                 u64 bytenr, u64 num_bytes, u64 parent,
2517                                 u64 root_objectid, u64 ref_generation,
2518                                 u64 owner_objectid);
2519 int btrfs_update_extent_ref(struct btrfs_trans_handle *trans,
2520                             struct btrfs_root *root, u64 bytenr,
2521                             u64 orig_parent, u64 parent,
2522                             u64 root_objectid, u64 ref_generation,
2523                             u64 owner_objectid);
2524 int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans,
2525                                     struct btrfs_root *root);
2526 int btrfs_free_block_groups(struct btrfs_fs_info *info);
2527 int btrfs_read_block_groups(struct btrfs_root *root);
2528 struct btrfs_block_group_cache *
2529 btrfs_add_block_group(struct btrfs_fs_info *fs_info, u64 bytes_used, u64 type,
2530                       u64 chunk_objectid, u64 chunk_offset, u64 size);
2531 int btrfs_make_block_group(struct btrfs_trans_handle *trans,
2532                            struct btrfs_root *root, u64 bytes_used,
2533                            u64 type, u64 chunk_objectid, u64 chunk_offset,
2534                            u64 size);
2535 int btrfs_make_block_groups(struct btrfs_trans_handle *trans,
2536                             struct btrfs_root *root);
2537 int btrfs_update_block_group(struct btrfs_trans_handle *trans,
2538                              struct btrfs_root *root, u64 bytenr, u64 num,
2539                              int alloc, int mark_free);
2540 int btrfs_record_file_extent(struct btrfs_trans_handle *trans,
2541                               struct btrfs_root *root, u64 objectid,
2542                               struct btrfs_inode_item *inode,
2543                               u64 file_pos, u64 disk_bytenr,
2544                               u64 num_bytes);
2545 int btrfs_free_block_group(struct btrfs_trans_handle *trans,
2546                            struct btrfs_fs_info *fs_info, u64 bytenr, u64 len);
2547 void free_excluded_extents(struct btrfs_root *root,
2548                            struct btrfs_block_group_cache *cache);
2549 int exclude_super_stripes(struct btrfs_root *root,
2550                           struct btrfs_block_group_cache *cache);
2551 u64 add_new_free_space(struct btrfs_block_group_cache *block_group,
2552                        struct btrfs_fs_info *info, u64 start, u64 end);
2553 u64 hash_extent_data_ref(u64 root_objectid, u64 owner, u64 offset);
2554
2555 /* ctree.c */
2556 int btrfs_comp_cpu_keys(struct btrfs_key *k1, struct btrfs_key *k2);
2557 int btrfs_del_ptr(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2558                    struct btrfs_path *path, int level, int slot);
2559 enum btrfs_tree_block_status
2560 btrfs_check_node(struct btrfs_root *root, struct btrfs_disk_key *parent_key,
2561                  struct extent_buffer *buf);
2562 enum btrfs_tree_block_status
2563 btrfs_check_leaf(struct btrfs_root *root, struct btrfs_disk_key *parent_key,
2564                  struct extent_buffer *buf);
2565 void reada_for_search(struct btrfs_root *root, struct btrfs_path *path,
2566                              int level, int slot, u64 objectid);
2567 struct extent_buffer *read_node_slot(struct btrfs_root *root,
2568                                    struct extent_buffer *parent, int slot);
2569 int btrfs_previous_item(struct btrfs_root *root,
2570                         struct btrfs_path *path, u64 min_objectid,
2571                         int type);
2572 int btrfs_previous_extent_item(struct btrfs_root *root,
2573                         struct btrfs_path *path, u64 min_objectid);
2574 int btrfs_next_extent_item(struct btrfs_root *root,
2575                         struct btrfs_path *path, u64 max_objectid);
2576 int btrfs_cow_block(struct btrfs_trans_handle *trans,
2577                     struct btrfs_root *root, struct extent_buffer *buf,
2578                     struct extent_buffer *parent, int parent_slot,
2579                     struct extent_buffer **cow_ret);
2580 int __btrfs_cow_block(struct btrfs_trans_handle *trans,
2581                              struct btrfs_root *root,
2582                              struct extent_buffer *buf,
2583                              struct extent_buffer *parent, int parent_slot,
2584                              struct extent_buffer **cow_ret,
2585                              u64 search_start, u64 empty_size);
2586 int btrfs_copy_root(struct btrfs_trans_handle *trans,
2587                       struct btrfs_root *root,
2588                       struct extent_buffer *buf,
2589                       struct extent_buffer **cow_ret, u64 new_root_objectid);
2590 int btrfs_extend_item(struct btrfs_trans_handle *trans, struct btrfs_root
2591                       *root, struct btrfs_path *path, u32 data_size);
2592 int btrfs_truncate_item(struct btrfs_trans_handle *trans,
2593                         struct btrfs_root *root,
2594                         struct btrfs_path *path,
2595                         u32 new_size, int from_end);
2596 int btrfs_split_item(struct btrfs_trans_handle *trans,
2597                      struct btrfs_root *root,
2598                      struct btrfs_path *path,
2599                      struct btrfs_key *new_key,
2600                      unsigned long split_offset);
2601 int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root
2602                       *root, struct btrfs_key *key, struct btrfs_path *p, int
2603                       ins_len, int cow);
2604 int btrfs_find_item(struct btrfs_root *fs_root, struct btrfs_path *found_path,
2605                 u64 iobjectid, u64 ioff, u8 key_type,
2606                 struct btrfs_key *found_key);
2607 void btrfs_release_path(struct btrfs_path *p);
2608 void add_root_to_dirty_list(struct btrfs_root *root);
2609 struct btrfs_path *btrfs_alloc_path(void);
2610 void btrfs_free_path(struct btrfs_path *p);
2611 void btrfs_init_path(struct btrfs_path *p);
2612 int btrfs_del_items(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2613                    struct btrfs_path *path, int slot, int nr);
2614
2615 static inline int btrfs_del_item(struct btrfs_trans_handle *trans,
2616                                  struct btrfs_root *root,
2617                                  struct btrfs_path *path)
2618 {
2619         return btrfs_del_items(trans, root, path, path->slots[0], 1);
2620 }
2621
2622 int btrfs_insert_item(struct btrfs_trans_handle *trans, struct btrfs_root
2623                       *root, struct btrfs_key *key, void *data, u32 data_size);
2624 int btrfs_insert_empty_items(struct btrfs_trans_handle *trans,
2625                              struct btrfs_root *root,
2626                              struct btrfs_path *path,
2627                              struct btrfs_key *cpu_key, u32 *data_size, int nr);
2628
2629 static inline int btrfs_insert_empty_item(struct btrfs_trans_handle *trans,
2630                                           struct btrfs_root *root,
2631                                           struct btrfs_path *path,
2632                                           struct btrfs_key *key,
2633                                           u32 data_size)
2634 {
2635         return btrfs_insert_empty_items(trans, root, path, key, &data_size, 1);
2636 }
2637
2638 int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path);
2639 static inline int btrfs_next_item(struct btrfs_root *root,
2640                                   struct btrfs_path *p)
2641 {
2642         ++p->slots[0];
2643         if (p->slots[0] >= btrfs_header_nritems(p->nodes[0]))
2644                 return btrfs_next_leaf(root, p);
2645         return 0;
2646 }
2647
2648 int btrfs_prev_leaf(struct btrfs_root *root, struct btrfs_path *path);
2649 int btrfs_leaf_free_space(struct btrfs_root *root, struct extent_buffer *leaf);
2650 void btrfs_fixup_low_keys(struct btrfs_root *root, struct btrfs_path *path,
2651                           struct btrfs_disk_key *key, int level);
2652 int btrfs_set_item_key_safe(struct btrfs_root *root, struct btrfs_path *path,
2653                             struct btrfs_key *new_key);
2654 void btrfs_set_item_key_unsafe(struct btrfs_root *root,
2655                                struct btrfs_path *path,
2656                                struct btrfs_key *new_key);
2657
2658 /* root-item.c */
2659 int btrfs_add_root_ref(struct btrfs_trans_handle *trans,
2660                        struct btrfs_root *tree_root,
2661                        u64 root_id, u8 type, u64 ref_id,
2662                        u64 dirid, u64 sequence,
2663                        const char *name, int name_len);
2664 int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root
2665                       *root, struct btrfs_key *key, struct btrfs_root_item
2666                       *item);
2667 int btrfs_update_root(struct btrfs_trans_handle *trans, struct btrfs_root
2668                       *root, struct btrfs_key *key, struct btrfs_root_item
2669                       *item);
2670 int btrfs_find_last_root(struct btrfs_root *root, u64 objectid, struct
2671                          btrfs_root_item *item, struct btrfs_key *key);
2672 /* dir-item.c */
2673 int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
2674                           *root, const char *name, int name_len, u64 dir,
2675                           struct btrfs_key *location, u8 type, u64 index);
2676 struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans,
2677                                              struct btrfs_root *root,
2678                                              struct btrfs_path *path, u64 dir,
2679                                              const char *name, int name_len,
2680                                              int mod);
2681 struct btrfs_dir_item *btrfs_lookup_dir_index(struct btrfs_trans_handle *trans,
2682                                               struct btrfs_root *root,
2683                                               struct btrfs_path *path, u64 dir,
2684                                               const char *name, int name_len,
2685                                               u64 index, int mod);
2686 int btrfs_delete_one_dir_name(struct btrfs_trans_handle *trans,
2687                               struct btrfs_root *root,
2688                               struct btrfs_path *path,
2689                               struct btrfs_dir_item *di);
2690 int btrfs_insert_xattr_item(struct btrfs_trans_handle *trans,
2691                             struct btrfs_root *root, const char *name,
2692                             u16 name_len, const void *data, u16 data_len,
2693                             u64 dir);
2694 /* inode-map.c */
2695 int btrfs_find_free_objectid(struct btrfs_trans_handle *trans,
2696                              struct btrfs_root *fs_root,
2697                              u64 dirid, u64 *objectid);
2698
2699 /* inode-item.c */
2700 int btrfs_insert_inode_ref(struct btrfs_trans_handle *trans,
2701                            struct btrfs_root *root,
2702                            const char *name, int name_len,
2703                            u64 inode_objectid, u64 ref_objectid, u64 index);
2704 int btrfs_insert_inode(struct btrfs_trans_handle *trans, struct btrfs_root
2705                        *root, u64 objectid, struct btrfs_inode_item
2706                        *inode_item);
2707 int btrfs_lookup_inode(struct btrfs_trans_handle *trans, struct btrfs_root
2708                        *root, struct btrfs_path *path,
2709                        struct btrfs_key *location, int mod);
2710 struct btrfs_inode_extref *btrfs_lookup_inode_extref(struct btrfs_trans_handle
2711                 *trans, struct btrfs_path *path, struct btrfs_root *root,
2712                 u64 ino, u64 parent_ino, u64 index, const char *name,
2713                 int namelen, int ins_len);
2714 int btrfs_del_inode_extref(struct btrfs_trans_handle *trans,
2715                            struct btrfs_root *root,
2716                            const char *name, int name_len,
2717                            u64 inode_objectid, u64 ref_objectid,
2718                            u64 *index);
2719 int btrfs_insert_inode_extref(struct btrfs_trans_handle *trans,
2720                               struct btrfs_root *root,
2721                               const char *name, int name_len,
2722                               u64 inode_objectid, u64 ref_objectid, u64 index);
2723 struct btrfs_inode_ref *btrfs_lookup_inode_ref(struct btrfs_trans_handle *trans,
2724                 struct btrfs_root *root, struct btrfs_path *path,
2725                 const char *name, int namelen, u64 ino, u64 parent_ino,
2726                 u64 index, int ins_len);
2727 int btrfs_del_inode_ref(struct btrfs_trans_handle *trans,
2728                         struct btrfs_root *root, const char *name, int name_len,
2729                         u64 ino, u64 parent_ino, u64 *index);
2730
2731 /* file-item.c */
2732 int btrfs_del_csums(struct btrfs_trans_handle *trans,
2733                     struct btrfs_root *root, u64 bytenr, u64 len);
2734 int btrfs_insert_file_extent(struct btrfs_trans_handle *trans,
2735                              struct btrfs_root *root,
2736                              u64 objectid, u64 pos, u64 offset,
2737                              u64 disk_num_bytes,
2738                              u64 num_bytes);
2739 int btrfs_insert_inline_extent(struct btrfs_trans_handle *trans,
2740                                 struct btrfs_root *root, u64 objectid,
2741                                 u64 offset, char *buffer, size_t size);
2742 int btrfs_csum_file_block(struct btrfs_trans_handle *trans,
2743                           struct btrfs_root *root, u64 alloc_end,
2744                           u64 bytenr, char *data, size_t len);
2745 int btrfs_csum_truncate(struct btrfs_trans_handle *trans,
2746                         struct btrfs_root *root, struct btrfs_path *path,
2747                         u64 isize);
2748
2749 /* uuid-tree.c */
2750 int btrfs_lookup_uuid_subvol_item(int fd, const u8 *uuid, u64 *subvol_id);
2751 int btrfs_lookup_uuid_received_subvol_item(int fd, const u8 *uuid,
2752                                            u64 *subvol_id);
2753
2754 static inline int is_fstree(u64 rootid)
2755 {
2756         if (rootid == BTRFS_FS_TREE_OBJECTID ||
2757             (signed long long)rootid >= (signed long long)BTRFS_FIRST_FREE_OBJECTID)
2758                 return 1;
2759         return 0;
2760 }
2761
2762 /* inode.c */
2763 int check_dir_conflict(struct btrfs_root *root, char *name, int namelen,
2764                 u64 dir, u64 index);
2765 int btrfs_new_inode(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2766                 u64 ino, u32 mode);
2767 int btrfs_change_inode_flags(struct btrfs_trans_handle *trans,
2768                              struct btrfs_root *root, u64 ino, u64 flags);
2769 int btrfs_add_link(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2770                    u64 ino, u64 parent_ino, char *name, int namelen,
2771                    u8 type, u64 *index, int add_backref);
2772 int btrfs_unlink(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2773                  u64 ino, u64 parent_ino, u64 index, const char *name,
2774                  int namelen, int add_orphan);
2775 int btrfs_add_orphan_item(struct btrfs_trans_handle *trans,
2776                           struct btrfs_root *root, struct btrfs_path *path,
2777                           u64 ino);
2778 int btrfs_mkdir(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2779                 char *name, int namelen, u64 parent_ino, u64 *ino, int mode);
2780
2781 /* file.c */
2782 int btrfs_get_extent(struct btrfs_trans_handle *trans,
2783                      struct btrfs_root *root,
2784                      struct btrfs_path *path,
2785                      u64 ino, u64 offset, u64 len, int ins_len);
2786 int btrfs_punch_hole(struct btrfs_trans_handle *trans,
2787                      struct btrfs_root *root,
2788                      u64 ino, u64 offset, u64 len);
2789 #endif