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__
  20 #define __BTRFS__
  21
  22 #include "list.h"
  23 #include "kerncompat.h"
  24 #include "radix-tree.h"
  25 #include "extent-cache.h"
  26 #include "extent_io.h"
  27
  28 struct btrfs_root;
  29 struct btrfs_trans_handle;
  30 #define BTRFS_MAGIC "_B4RfS_M"
  31
  32 #define BTRFS_MAX_LEVEL 8
  33
  34 /* holds pointers to all of the tree roots */
  35 #define BTRFS_ROOT_TREE_OBJECTID 1ULL
  36
  37 /* stores information about which extents are in use, and reference counts */
  38 #define BTRFS_EXTENT_TREE_OBJECTID 2ULL
  39
  40 /*
  41  * chunk tree stores translations from logical -> physical block numbering
  42  * the super block points to the chunk tree
  43  */
  44 #define BTRFS_CHUNK_TREE_OBJECTID 3ULL
  45
  46 /*
  47  * stores information about which areas of a given device are in use.
  48  * one per device.  The tree of tree roots points to the device tree
  49  */
  50 #define BTRFS_DEV_TREE_OBJECTID 4ULL
  51
  52 /* one per subvolume, storing files and directories */
  53 #define BTRFS_FS_TREE_OBJECTID 5ULL
  54
  55 /* directory objectid inside the root tree */
  56 #define BTRFS_ROOT_TREE_DIR_OBJECTID 6ULL
  57
  58 /*
  59  * All files have objectids higher than this.
  60  */
  61 #define BTRFS_FIRST_FREE_OBJECTID 256ULL
  62
  63
  64 /*
  65  * the device items go into the chunk tree.  The key is in the form
  66  * [ 1 BTRFS_DEV_ITEM_KEY device_id ]
  67  */
  68 #define BTRFS_DEV_ITEMS_OBJECTID 1ULL
  69
  70 /*
  71  * we can actually store much bigger names, but lets not confuse the rest
  72  * of linux
  73  */
  74 #define BTRFS_NAME_LEN 255
  75
  76 /* 32 bytes in various csum fields */
  77 #define BTRFS_CSUM_SIZE 32
  78 /* four bytes for CRC32 */
  79 #define BTRFS_CRC32_SIZE 4
  80 #define BTRFS_EMPTY_DIR_SIZE 0
  81
  82 #define BTRFS_FT_UNKNOWN        0
  83 #define BTRFS_FT_REG_FILE       1
  84 #define BTRFS_FT_DIR            2
  85 #define BTRFS_FT_CHRDEV         3
  86 #define BTRFS_FT_BLKDEV         4
  87 #define BTRFS_FT_FIFO           5
  88 #define BTRFS_FT_SOCK           6
  89 #define BTRFS_FT_SYMLINK        7
  90 #define BTRFS_FT_XATTR          8
  91 #define BTRFS_FT_MAX            9
  92
  93 /*
  94  * the key defines the order in the tree, and so it also defines (optimal)
  95  * block layout.  objectid corresonds to the inode number.  The flags
  96  * tells us things about the object, and is a kind of stream selector.
  97  * so for a given inode, keys with flags of 1 might refer to the inode
  98  * data, flags of 2 may point to file data in the btree and flags == 3
  99  * may point to extents.
 100  *
 101  * offset is the starting byte offset for this key in the stream.
 102  *
 103  * btrfs_disk_key is in disk byte order.  struct btrfs_key is always
 104  * in cpu native order.  Otherwise they are identical and their sizes
 105  * should be the same (ie both packed)
 106  */
 107 struct btrfs_disk_key {
 108         __le64 objectid;
 109         u8 type;
 110         __le64 offset;
 111 } __attribute__ ((__packed__));
 112
 113 struct btrfs_key {
 114         u64 objectid;
 115         u8 type;
 116         u64 offset;
 117 } __attribute__ ((__packed__));
 118
 119 struct btrfs_mapping_tree {
 120         struct cache_tree cache_tree;
 121 };
 122
 123 #define BTRFS_DEV_UUID_SIZE 16
 124 struct btrfs_dev_item {
 125         /* the internal btrfs device id */
 126         __le64 devid;
 127
 128         /* size of the device */
 129         __le64 total_bytes;
 130
 131         /* bytes used */
 132         __le64 bytes_used;
 133
 134         /* optimal io alignment for this device */
 135         __le32 io_align;
 136
 137         /* optimal io width for this device */
 138         __le32 io_width;
 139
 140         /* minimal io size for this device */
 141         __le32 sector_size;
 142
 143         /* type and info about this device */
 144         __le64 type;
 145
 146         /* btrfs generated uuid for this device */
 147         u8 uuid[BTRFS_DEV_UUID_SIZE];
 148 } __attribute__ ((__packed__));
 149
 150 struct btrfs_stripe {
 151         __le64 devid;
 152         __le64 offset;
 153 } __attribute__ ((__packed__));
 154
 155 struct btrfs_chunk {
 156         __le64 owner;
 157         __le64 stripe_len;
 158         __le64 type;
 159
 160         /* optimal io alignment for this chunk */
 161         __le32 io_align;
 162
 163         /* optimal io width for this chunk */
 164         __le32 io_width;
 165
 166         /* minimal io size for this chunk */
 167         __le32 sector_size;
 168
 169         /* 2^16 stripes is quite a lot, a second limit is the size of a single
 170          * item in the btree
 171          */
 172         __le16 num_stripes;
 173         struct btrfs_stripe stripe;
 174         /* additional stripes go here */
 175 } __attribute__ ((__packed__));
 176
 177 static inline unsigned long btrfs_chunk_item_size(int num_stripes)
 178 {
 179         BUG_ON(num_stripes == 0);
 180         return sizeof(struct btrfs_chunk) +
 181                 sizeof(struct btrfs_stripe) * (num_stripes - 1);
 182 }
 183
 184 #define BTRFS_FSID_SIZE 16
 185 /*
 186  * every tree block (leaf or node) starts with this header.
 187  */
 188 struct btrfs_header {
 189         u8 csum[BTRFS_CSUM_SIZE];
 190         u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
 191         __le64 bytenr; /* which block this node is supposed to live in */
 192         __le64 generation;
 193         __le64 owner;
 194         __le32 nritems;
 195         __le16 flags;
 196         u8 level;
 197 } __attribute__ ((__packed__));
 198
 199 #define BTRFS_NODEPTRS_PER_BLOCK(r) (((r)->nodesize - \
 200                                 sizeof(struct btrfs_header)) / \
 201                                 sizeof(struct btrfs_key_ptr))
 202 #define __BTRFS_LEAF_DATA_SIZE(bs) ((bs) - sizeof(struct btrfs_header))
 203 #define BTRFS_LEAF_DATA_SIZE(r) (__BTRFS_LEAF_DATA_SIZE(r->leafsize))
 204 #define BTRFS_MAX_INLINE_DATA_SIZE(r) (BTRFS_LEAF_DATA_SIZE(r) - \
 205                                         sizeof(struct btrfs_item) - \
 206                                         sizeof(struct btrfs_file_extent_item))
 207
 208 /*
 209  * this is a very generous portion of the super block, giving us
 210  * room to translate 14 chunks with 3 stripes each.
 211  */
 212 #define BTRFS_SYSTEM_CHUNK_ARRAY_SIZE 2048
 213
 214 /*
 215  * the super block basically lists the main trees of the FS
 216  * it currently lacks any block count etc etc
 217  */
 218 struct btrfs_super_block {
 219         u8 csum[BTRFS_CSUM_SIZE];
 220         /* the first 3 fields must match struct btrfs_header */
 221         u8 fsid[BTRFS_FSID_SIZE];    /* FS specific uuid */
 222         __le64 bytenr; /* this block number */
 223         __le64 magic;
 224         __le64 generation;
 225         __le64 root;
 226         __le64 chunk_root;
 227         __le64 total_bytes;
 228         __le64 bytes_used;
 229         __le64 root_dir_objectid;
 230         __le64 num_devices;
 231         __le32 sectorsize;
 232         __le32 nodesize;
 233         __le32 leafsize;
 234         __le32 stripesize;
 235         __le32 sys_chunk_array_size;
 236         u8 root_level;
 237         u8 chunk_root_level;
 238         struct btrfs_dev_item dev_item;
 239         u8 sys_chunk_array[BTRFS_SYSTEM_CHUNK_ARRAY_SIZE];
 240 } __attribute__ ((__packed__));
 241
 242 /*
 243  * A leaf is full of items. offset and size tell us where to find
 244  * the item in the leaf (relative to the start of the data area)
 245  */
 246 struct btrfs_item {
 247         struct btrfs_disk_key key;
 248         __le32 offset;
 249         __le32 size;
 250 } __attribute__ ((__packed__));
 251
 252 /*
 253  * leaves have an item area and a data area:
 254  * [item0, item1....itemN] [free space] [dataN...data1, data0]
 255  *
 256  * The data is separate from the items to get the keys closer together
 257  * during searches.
 258  */
 259 struct btrfs_leaf {
 260         struct btrfs_header header;
 261         struct btrfs_item items[];
 262 } __attribute__ ((__packed__));
 263
 264 /*
 265  * all non-leaf blocks are nodes, they hold only keys and pointers to
 266  * other blocks
 267  */
 268 struct btrfs_key_ptr {
 269         struct btrfs_disk_key key;
 270         __le64 blockptr;
 271         __le64 generation;
 272 } __attribute__ ((__packed__));
 273
 274 struct btrfs_node {
 275         struct btrfs_header header;
 276         struct btrfs_key_ptr ptrs[];
 277 } __attribute__ ((__packed__));
 278
 279 /*
 280  * btrfs_paths remember the path taken from the root down to the leaf.
 281  * level 0 is always the leaf, and nodes[1...BTRFS_MAX_LEVEL] will point
 282  * to any other levels that are present.
 283  *
 284  * The slots array records the index of the item or block pointer
 285  * used while walking the tree.
 286  */
 287 struct btrfs_path {
 288         struct extent_buffer *nodes[BTRFS_MAX_LEVEL];
 289         int slots[BTRFS_MAX_LEVEL];
 290         int reada;
 291         int lowest_level;
 292 };
 293
 294 /*
 295  * items in the extent btree are used to record the objectid of the
 296  * owner of the block and the number of references
 297  */
 298 struct btrfs_extent_item {
 299         __le32 refs;
 300 } __attribute__ ((__packed__));
 301
 302 struct btrfs_extent_ref {
 303         __le64 root;
 304         __le64 generation;
 305         __le64 objectid;
 306         __le64 offset;
 307 } __attribute__ ((__packed__));
 308
 309 /* dev extents record free space on individual devices.  The owner
 310  * field points back to the chunk allocation mapping tree that allocated
 311  * the extent
 312  */
 313 struct btrfs_dev_extent {
 314         __le64 owner;
 315         __le64 length;
 316 } __attribute__ ((__packed__));
 317
 318
 319 struct btrfs_inode_ref {
 320         __le16 name_len;
 321         /* name goes here */
 322 } __attribute__ ((__packed__));
 323
 324 struct btrfs_timespec {
 325         __le64 sec;
 326         __le32 nsec;
 327 } __attribute__ ((__packed__));
 328
 329 /*
 330  * there is no padding here on purpose.  If you want to extent the inode,
 331  * make a new item type
 332  */
 333 struct btrfs_inode_item {
 334         __le64 generation;
 335         __le64 size;
 336         __le64 nblocks;
 337         __le64 block_group;
 338         __le32 nlink;
 339         __le32 uid;
 340         __le32 gid;
 341         __le32 mode;
 342         __le64 rdev;
 343         __le16 flags;
 344         __le16 compat_flags;
 345         struct btrfs_timespec atime;
 346         struct btrfs_timespec ctime;
 347         struct btrfs_timespec mtime;
 348         struct btrfs_timespec otime;
 349 } __attribute__ ((__packed__));
 350
 351 struct btrfs_dir_item {
 352         struct btrfs_disk_key location;
 353         __le16 data_len;
 354         __le16 name_len;
 355         u8 type;
 356 } __attribute__ ((__packed__));
 357
 358 struct btrfs_root_item {
 359         struct btrfs_inode_item inode;
 360         __le64 root_dirid;
 361         __le64 bytenr;
 362         __le64 byte_limit;
 363         __le64 bytes_used;
 364         __le32 flags;
 365         __le32 refs;
 366         struct btrfs_disk_key drop_progress;
 367         u8 drop_level;
 368         u8 level;
 369 } __attribute__ ((__packed__));
 370
 371 #define BTRFS_FILE_EXTENT_REG 0
 372 #define BTRFS_FILE_EXTENT_INLINE 1
 373
 374 struct btrfs_file_extent_item {
 375         __le64 generation;
 376         u8 type;
 377         /*
 378          * disk space consumed by the extent, checksum blocks are included
 379          * in these numbers
 380          */
 381         __le64 disk_bytenr;
 382         __le64 disk_num_bytes;
 383         /*
 384          * the logical offset in file blocks (no csums)
 385          * this extent record is for.  This allows a file extent to point
 386          * into the middle of an existing extent on disk, sharing it
 387          * between two snapshots (useful if some bytes in the middle of the
 388          * extent have changed
 389          */
 390         __le64 offset;
 391         /*
 392          * the logical number of file blocks (no csums included)
 393          */
 394         __le64 num_bytes;
 395 } __attribute__ ((__packed__));
 396
 397 struct btrfs_csum_item {
 398         u8 csum;
 399 } __attribute__ ((__packed__));
 400
 401 /* tag for the radix tree of block groups in ram */
 402 #define BTRFS_BLOCK_GROUP_DATA     (1 << 0)
 403 #define BTRFS_BLOCK_GROUP_SYSTEM   (1 << 1)
 404 #define BTRFS_BLOCK_GROUP_METADATA (1 << 2)
 405
 406 struct btrfs_block_group_item {
 407         __le64 used;
 408         __le64 chunk_tree;
 409         __le64 chunk_objectid;
 410         __le64 flags;
 411 } __attribute__ ((__packed__));
 412
 413 struct btrfs_space_info {
 414         u64 flags;
 415         u64 total_bytes;
 416         u64 bytes_used;
 417         u64 bytes_pinned;
 418         int full;
 419         struct list_head list;
 420 };
 421
 422 struct btrfs_block_group_cache {
 423         struct cache_extent cache;
 424         struct btrfs_key key;
 425         struct btrfs_block_group_item item;
 426         struct btrfs_space_info *space_info;
 427         u64 pinned;
 428         u64 flags;
 429         int cached;
 430 };
 431
 432 struct btrfs_extent_ops {
 433        int (*alloc_extent)(struct btrfs_root *root, u64 num_bytes,
 434                            u64 hint_byte, struct btrfs_key *ins);
 435        int (*free_extent)(struct btrfs_root *root, u64 bytenr,
 436                           u64 num_bytes);
 437 };
 438
 439 struct btrfs_device;
 440 struct btrfs_fs_info {
 441         u8 fsid[BTRFS_FSID_SIZE];
 442         struct btrfs_root *fs_root;
 443         struct btrfs_root *extent_root;
 444         struct btrfs_root *tree_root;
 445         struct btrfs_root *chunk_root;
 446         struct btrfs_root *dev_root;
 447
 448         struct extent_io_tree extent_cache;
 449         struct extent_io_tree free_space_cache;
 450         struct extent_io_tree block_group_cache;
 451         struct extent_io_tree pinned_extents;
 452         struct extent_io_tree pending_del;
 453         struct extent_io_tree extent_ins;
 454
 455         /* logical->physical extent mapping */
 456         struct btrfs_mapping_tree mapping_tree;
 457
 458         u64 generation;
 459         u64 last_trans_committed;
 460         struct btrfs_trans_handle *running_transaction;
 461         struct btrfs_super_block super_copy;
 462         struct extent_buffer *sb_buffer;
 463         struct mutex fs_mutex;
 464         u64 total_pinned;
 465
 466         struct btrfs_extent_ops *extent_ops;
 467         struct list_head dirty_cowonly_roots;
 468
 469         struct list_head devices;
 470         struct list_head space_info;
 471         int fp;
 472         int force_system_allocs;
 473         void *priv_data;
 474 };
 475
 476 /*
 477  * in ram representation of the tree.  extent_root is used for all allocations
 478  * and for the extent tree extent_root root.
 479  */
 480 struct btrfs_root {
 481         struct extent_buffer *node;
 482         struct extent_buffer *commit_root;
 483         struct btrfs_root_item root_item;
 484         struct btrfs_key root_key;
 485         struct btrfs_fs_info *fs_info;
 486         u64 objectid;
 487         u64 last_trans;
 488
 489         /* data allocations are done in sectorsize units */
 490         u32 sectorsize;
 491
 492         /* node allocations are done in nodesize units */
 493         u32 nodesize;
 494
 495         /* leaf allocations are done in leafsize units */
 496         u32 leafsize;
 497
 498         /* leaf allocations are done in leafsize units */
 499         u32 stripesize;
 500
 501         int ref_cows;
 502         int track_dirty;
 503
 504
 505         u32 type;
 506         u64 highest_inode;
 507         u64 last_inode_alloc;
 508
 509         /* the dirty list is only used by non-reference counted roots */
 510         struct list_head dirty_list;
 511 };
 512
 513 /*
 514  * inode items have the data typically returned from stat and store other
 515  * info about object characteristics.  There is one for every file and dir in
 516  * the FS
 517  */
 518 #define BTRFS_INODE_ITEM_KEY            1
 519 #define BTRFS_INODE_REF_KEY             2
 520 #define BTRFS_XATTR_ITEM_KEY            8
 521
 522 /* reserve 3-15 close to the inode for later flexibility */
 523
 524 /*
 525  * dir items are the name -> inode pointers in a directory.  There is one
 526  * for every name in a directory.
 527  */
 528 #define BTRFS_DIR_ITEM_KEY      16
 529 #define BTRFS_DIR_INDEX_KEY     17
 530 /*
 531  * extent data is for file data
 532  */
 533 #define BTRFS_EXTENT_DATA_KEY   18
 534 /*
 535  * csum items have the checksums for data in the extents
 536  */
 537 #define BTRFS_CSUM_ITEM_KEY     19
 538
 539 /* reserve 20-31 for other file stuff */
 540
 541 /*
 542  * root items point to tree roots.  There are typically in the root
 543  * tree used by the super block to find all the other trees
 544  */
 545 #define BTRFS_ROOT_ITEM_KEY     32
 546 /*
 547  * extent items are in the extent map tree.  These record which blocks
 548  * are used, and how many references there are to each block
 549  */
 550 #define BTRFS_EXTENT_ITEM_KEY   33
 551 #define BTRFS_EXTENT_REF_KEY    34
 552
 553 /*
 554  * block groups give us hints into the extent allocation trees.  Which
 555  * blocks are free etc etc
 556  */
 557 #define BTRFS_BLOCK_GROUP_ITEM_KEY 50
 558
 559 #define BTRFS_DEV_EXTENT_KEY    75
 560 #define BTRFS_DEV_ITEM_KEY      76
 561 #define BTRFS_CHUNK_ITEM_KEY    77
 562
 563 /*
 564  * string items are for debugging.  They just store a short string of
 565  * data in the FS
 566  */
 567 #define BTRFS_STRING_ITEM_KEY   253
 568 /*
 569  * Inode flags
 570  */
 571 #define BTRFS_INODE_NODATASUM           (1 << 0)
 572 #define BTRFS_INODE_NODATACOW           (1 << 1)
 573 #define BTRFS_INODE_READONLY            (1 << 2)
 574
 575 #define read_eb_member(eb, ptr, type, member, result) (                 \
 576         read_extent_buffer(eb, (char *)(result),                        \
 577                            ((unsigned long)(ptr)) +                     \
 578                             offsetof(type, member),                     \
 579                            sizeof(((type *)0)->member)))
 580
 581 #define write_eb_member(eb, ptr, type, member, result) (                \
 582         write_extent_buffer(eb, (char *)(result),                       \
 583                            ((unsigned long)(ptr)) +                     \
 584                             offsetof(type, member),                     \
 585                            sizeof(((type *)0)->member)))
 586
 587 #define BTRFS_SETGET_HEADER_FUNCS(name, type, member, bits)             \
 588 static inline u##bits btrfs_##name(struct extent_buffer *eb)            \
 589 {                                                                       \
 590         struct btrfs_header *h = (struct btrfs_header *)eb->data;       \
 591         return le##bits##_to_cpu(h->member);                            \
 592 }                                                                       \
 593 static inline void btrfs_set_##name(struct extent_buffer *eb,           \
 594                                     u##bits val)                        \
 595 {                                                                       \
 596         struct btrfs_header *h = (struct btrfs_header *)eb->data;       \
 597         h->member = cpu_to_le##bits(val);                               \
 598 }
 599
 600 #define BTRFS_SETGET_FUNCS(name, type, member, bits)                    \
 601 static inline u##bits btrfs_##name(struct extent_buffer *eb,            \
 602                                    type *s)                             \
 603 {                                                                       \
 604         unsigned long offset = (unsigned long)s;                        \
 605         type *p = (type *) (eb->data + offset);                         \
 606         return le##bits##_to_cpu(p->member);                            \
 607 }                                                                       \
 608 static inline void btrfs_set_##name(struct extent_buffer *eb,           \
 609                                     type *s, u##bits val)               \
 610 {                                                                       \
 611         unsigned long offset = (unsigned long)s;                        \
 612         type *p = (type *) (eb->data + offset);                         \
 613         p->member = cpu_to_le##bits(val);                               \
 614 }
 615
 616 #define BTRFS_SETGET_STACK_FUNCS(name, type, member, bits)              \
 617 static inline u##bits btrfs_##name(type *s)                             \
 618 {                                                                       \
 619         return le##bits##_to_cpu(s->member);                            \
 620 }                                                                       \
 621 static inline void btrfs_set_##name(type *s, u##bits val)               \
 622 {                                                                       \
 623         s->member = cpu_to_le##bits(val);                               \
 624 }
 625
 626 BTRFS_SETGET_FUNCS(device_type, struct btrfs_dev_item, type, 64);
 627 BTRFS_SETGET_FUNCS(device_total_bytes, struct btrfs_dev_item, total_bytes, 64);
 628 BTRFS_SETGET_FUNCS(device_bytes_used, struct btrfs_dev_item, bytes_used, 64);
 629 BTRFS_SETGET_FUNCS(device_io_align, struct btrfs_dev_item, io_align, 32);
 630 BTRFS_SETGET_FUNCS(device_io_width, struct btrfs_dev_item, io_width, 32);
 631 BTRFS_SETGET_FUNCS(device_sector_size, struct btrfs_dev_item, sector_size, 32);
 632 BTRFS_SETGET_FUNCS(device_id, struct btrfs_dev_item, devid, 64);
 633
 634 BTRFS_SETGET_STACK_FUNCS(stack_device_type, struct btrfs_dev_item, type, 64);
 635 BTRFS_SETGET_STACK_FUNCS(stack_device_total_bytes, struct btrfs_dev_item,
 636                          total_bytes, 64);
 637 BTRFS_SETGET_STACK_FUNCS(stack_device_bytes_used, struct btrfs_dev_item,
 638                          bytes_used, 64);
 639 BTRFS_SETGET_STACK_FUNCS(stack_device_io_align, struct btrfs_dev_item,
 640                          io_align, 32);
 641 BTRFS_SETGET_STACK_FUNCS(stack_device_io_width, struct btrfs_dev_item,
 642                          io_width, 32);
 643 BTRFS_SETGET_STACK_FUNCS(stack_device_sector_size, struct btrfs_dev_item,
 644                          sector_size, 32);
 645 BTRFS_SETGET_STACK_FUNCS(stack_device_id, struct btrfs_dev_item, devid, 64);
 646
 647 static inline char *btrfs_device_uuid(struct btrfs_dev_item *d)
 648 {
 649         return (char *)d + offsetof(struct btrfs_dev_item, uuid);
 650 }
 651
 652 BTRFS_SETGET_FUNCS(chunk_owner, struct btrfs_chunk, owner, 64);
 653 BTRFS_SETGET_FUNCS(chunk_stripe_len, struct btrfs_chunk, stripe_len, 64);
 654 BTRFS_SETGET_FUNCS(chunk_io_align, struct btrfs_chunk, io_align, 32);
 655 BTRFS_SETGET_FUNCS(chunk_io_width, struct btrfs_chunk, io_width, 32);
 656 BTRFS_SETGET_FUNCS(chunk_sector_size, struct btrfs_chunk, sector_size, 32);
 657 BTRFS_SETGET_FUNCS(chunk_type, struct btrfs_chunk, type, 64);
 658 BTRFS_SETGET_FUNCS(chunk_num_stripes, struct btrfs_chunk, num_stripes, 16);
 659 BTRFS_SETGET_FUNCS(stripe_devid, struct btrfs_stripe, devid, 64);
 660 BTRFS_SETGET_FUNCS(stripe_offset, struct btrfs_stripe, offset, 64);
 661
 662 BTRFS_SETGET_STACK_FUNCS(stack_chunk_owner, struct btrfs_chunk, owner, 64);
 663 BTRFS_SETGET_STACK_FUNCS(stack_chunk_stripe_len, struct btrfs_chunk,
 664                          stripe_len, 64);
 665 BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_align, struct btrfs_chunk,
 666                          io_align, 32);
 667 BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_width, struct btrfs_chunk,
 668                          io_width, 32);
 669 BTRFS_SETGET_STACK_FUNCS(stack_chunk_sector_size, struct btrfs_chunk,
 670                          sector_size, 32);
 671 BTRFS_SETGET_STACK_FUNCS(stack_chunk_type, struct btrfs_chunk, type, 64);
 672 BTRFS_SETGET_STACK_FUNCS(stack_chunk_num_stripes, struct btrfs_chunk,
 673                          num_stripes, 16);
 674 BTRFS_SETGET_STACK_FUNCS(stack_stripe_devid, struct btrfs_stripe, devid, 64);
 675 BTRFS_SETGET_STACK_FUNCS(stack_stripe_offset, struct btrfs_stripe, offset, 64);
 676
 677 static inline struct btrfs_stripe *btrfs_stripe_nr(struct btrfs_chunk *c,
 678                                                    int nr)
 679 {
 680         unsigned long offset = (unsigned long)c;
 681         offset += offsetof(struct btrfs_chunk, stripe);
 682         offset += nr * sizeof(struct btrfs_stripe);
 683         return (struct btrfs_stripe *)offset;
 684 }
 685
 686 static inline u64 btrfs_stripe_offset_nr(struct extent_buffer *eb,
 687                                          struct btrfs_chunk *c, int nr)
 688 {
 689         return btrfs_stripe_offset(eb, btrfs_stripe_nr(c, nr));
 690 }
 691
 692 static inline void btrfs_set_stripe_offset_nr(struct extent_buffer *eb,
 693                                              struct btrfs_chunk *c, int nr,
 694                                              u64 val)
 695 {
 696         btrfs_set_stripe_offset(eb, btrfs_stripe_nr(c, nr), val);
 697 }
 698
 699 static inline u64 btrfs_stripe_devid_nr(struct extent_buffer *eb,
 700                                          struct btrfs_chunk *c, int nr)
 701 {
 702         return btrfs_stripe_devid(eb, btrfs_stripe_nr(c, nr));
 703 }
 704
 705 static inline void btrfs_set_stripe_devid_nr(struct extent_buffer *eb,
 706                                              struct btrfs_chunk *c, int nr,
 707                                              u64 val)
 708 {
 709         btrfs_set_stripe_devid(eb, btrfs_stripe_nr(c, nr), val);
 710 }
 711
 712 /* struct btrfs_block_group_item */
 713 BTRFS_SETGET_STACK_FUNCS(block_group_used, struct btrfs_block_group_item,
 714                          used, 64);
 715 BTRFS_SETGET_FUNCS(disk_block_group_used, struct btrfs_block_group_item,
 716                          used, 64);
 717 BTRFS_SETGET_STACK_FUNCS(block_group_chunk_tree, struct btrfs_block_group_item,
 718                          chunk_tree, 64);
 719 BTRFS_SETGET_FUNCS(disk_block_group_chunk_tree, struct btrfs_block_group_item,
 720                          chunk_tree, 64);
 721 BTRFS_SETGET_STACK_FUNCS(block_group_chunk_objectid,
 722                         struct btrfs_block_group_item, chunk_objectid, 64);
 723 BTRFS_SETGET_FUNCS(disk_block_group_chunk_objecitd,
 724                    struct btrfs_block_group_item, chunk_objectid, 64);
 725 BTRFS_SETGET_FUNCS(disk_block_group_flags,
 726                    struct btrfs_block_group_item, flags, 64);
 727 BTRFS_SETGET_STACK_FUNCS(block_group_flags,
 728                         struct btrfs_block_group_item, flags, 64);
 729
 730 /* struct btrfs_inode_ref */
 731 BTRFS_SETGET_FUNCS(inode_ref_name_len, struct btrfs_inode_ref, name_len, 16);
 732
 733 /* struct btrfs_inode_item */
 734 BTRFS_SETGET_FUNCS(inode_generation, struct btrfs_inode_item, generation, 64);
 735 BTRFS_SETGET_FUNCS(inode_size, struct btrfs_inode_item, size, 64);
 736 BTRFS_SETGET_FUNCS(inode_nblocks, struct btrfs_inode_item, nblocks, 64);
 737 BTRFS_SETGET_FUNCS(inode_block_group, struct btrfs_inode_item, block_group, 64);
 738 BTRFS_SETGET_FUNCS(inode_nlink, struct btrfs_inode_item, nlink, 32);
 739 BTRFS_SETGET_FUNCS(inode_uid, struct btrfs_inode_item, uid, 32);
 740 BTRFS_SETGET_FUNCS(inode_gid, struct btrfs_inode_item, gid, 32);
 741 BTRFS_SETGET_FUNCS(inode_mode, struct btrfs_inode_item, mode, 32);
 742 BTRFS_SETGET_FUNCS(inode_rdev, struct btrfs_inode_item, rdev, 64);
 743 BTRFS_SETGET_FUNCS(inode_flags, struct btrfs_inode_item, flags, 16);
 744 BTRFS_SETGET_FUNCS(inode_compat_flags, struct btrfs_inode_item,
 745                    compat_flags, 16);
 746
 747 BTRFS_SETGET_STACK_FUNCS(stack_inode_generation,
 748                          struct btrfs_inode_item, generation, 64);
 749 BTRFS_SETGET_STACK_FUNCS(stack_inode_size,
 750                          struct btrfs_inode_item, size, 64);
 751 BTRFS_SETGET_STACK_FUNCS(stack_inode_nblocks,
 752                          struct btrfs_inode_item, nblocks, 64);
 753 BTRFS_SETGET_STACK_FUNCS(stack_inode_block_group,
 754                          struct btrfs_inode_item, block_group, 64);
 755 BTRFS_SETGET_STACK_FUNCS(stack_inode_nlink,
 756                          struct btrfs_inode_item, nlink, 32);
 757 BTRFS_SETGET_STACK_FUNCS(stack_inode_uid,
 758                          struct btrfs_inode_item, uid, 32);
 759 BTRFS_SETGET_STACK_FUNCS(stack_inode_gid,
 760                          struct btrfs_inode_item, gid, 32);
 761 BTRFS_SETGET_STACK_FUNCS(stack_inode_mode,
 762                          struct btrfs_inode_item, mode, 32);
 763 BTRFS_SETGET_STACK_FUNCS(stack_inode_rdev,
 764                          struct btrfs_inode_item, rdev, 64);
 765 BTRFS_SETGET_STACK_FUNCS(stack_inode_flags,
 766                          struct btrfs_inode_item, flags, 16);
 767 BTRFS_SETGET_STACK_FUNCS(stack_inode_compat_flags,
 768                          struct btrfs_inode_item, compat_flags, 16);
 769
 770 static inline struct btrfs_timespec *
 771 btrfs_inode_atime(struct btrfs_inode_item *inode_item)
 772 {
 773         unsigned long ptr = (unsigned long)inode_item;
 774         ptr += offsetof(struct btrfs_inode_item, atime);
 775         return (struct btrfs_timespec *)ptr;
 776 }
 777
 778 static inline struct btrfs_timespec *
 779 btrfs_inode_mtime(struct btrfs_inode_item *inode_item)
 780 {
 781         unsigned long ptr = (unsigned long)inode_item;
 782         ptr += offsetof(struct btrfs_inode_item, mtime);
 783         return (struct btrfs_timespec *)ptr;
 784 }
 785
 786 static inline struct btrfs_timespec *
 787 btrfs_inode_ctime(struct btrfs_inode_item *inode_item)
 788 {
 789         unsigned long ptr = (unsigned long)inode_item;
 790         ptr += offsetof(struct btrfs_inode_item, ctime);
 791         return (struct btrfs_timespec *)ptr;
 792 }
 793
 794 static inline struct btrfs_timespec *
 795 btrfs_inode_otime(struct btrfs_inode_item *inode_item)
 796 {
 797         unsigned long ptr = (unsigned long)inode_item;
 798         ptr += offsetof(struct btrfs_inode_item, otime);
 799         return (struct btrfs_timespec *)ptr;
 800 }
 801
 802 BTRFS_SETGET_FUNCS(timespec_sec, struct btrfs_timespec, sec, 64);
 803 BTRFS_SETGET_FUNCS(timespec_nsec, struct btrfs_timespec, nsec, 32);
 804 BTRFS_SETGET_STACK_FUNCS(stack_timespec_sec, struct btrfs_timespec,
 805                          sec, 64);
 806 BTRFS_SETGET_STACK_FUNCS(stack_timespec_nsec, struct btrfs_timespec,
 807                          nsec, 32);
 808
 809 /* struct btrfs_dev_extent */
 810 BTRFS_SETGET_FUNCS(dev_extent_owner, struct btrfs_dev_extent, owner, 64);
 811 BTRFS_SETGET_FUNCS(dev_extent_length, struct btrfs_dev_extent, length, 64);
 812
 813 /* struct btrfs_extent_item */
 814 BTRFS_SETGET_FUNCS(extent_refs, struct btrfs_extent_item, refs, 32);
 815
 816 /* struct btrfs_extent_ref */
 817 BTRFS_SETGET_FUNCS(ref_root, struct btrfs_extent_ref, root, 64);
 818 BTRFS_SETGET_FUNCS(ref_generation, struct btrfs_extent_ref, generation, 64);
 819 BTRFS_SETGET_FUNCS(ref_objectid, struct btrfs_extent_ref, objectid, 64);
 820 BTRFS_SETGET_FUNCS(ref_offset, struct btrfs_extent_ref, offset, 64);
 821
 822 BTRFS_SETGET_STACK_FUNCS(stack_ref_root, struct btrfs_extent_ref, root, 64);
 823 BTRFS_SETGET_STACK_FUNCS(stack_ref_generation, struct btrfs_extent_ref,
 824                          generation, 64);
 825 BTRFS_SETGET_STACK_FUNCS(stack_ref_objectid, struct btrfs_extent_ref,
 826                          objectid, 64);
 827 BTRFS_SETGET_STACK_FUNCS(stack_ref_offset, struct btrfs_extent_ref, offset, 64);
 828
 829 BTRFS_SETGET_STACK_FUNCS(stack_extent_refs, struct btrfs_extent_item,
 830                          refs, 32);
 831
 832 /* struct btrfs_node */
 833 BTRFS_SETGET_FUNCS(key_blockptr, struct btrfs_key_ptr, blockptr, 64);
 834 BTRFS_SETGET_FUNCS(key_generation, struct btrfs_key_ptr, generation, 64);
 835
 836 static inline u64 btrfs_node_blockptr(struct extent_buffer *eb, int nr)
 837 {
 838         unsigned long ptr;
 839         ptr = offsetof(struct btrfs_node, ptrs) +
 840                 sizeof(struct btrfs_key_ptr) * nr;
 841         return btrfs_key_blockptr(eb, (struct btrfs_key_ptr *)ptr);
 842 }
 843
 844 static inline void btrfs_set_node_blockptr(struct extent_buffer *eb,
 845                                            int nr, u64 val)
 846 {
 847         unsigned long ptr;
 848         ptr = offsetof(struct btrfs_node, ptrs) +
 849                 sizeof(struct btrfs_key_ptr) * nr;
 850         btrfs_set_key_blockptr(eb, (struct btrfs_key_ptr *)ptr, val);
 851 }
 852
 853 static inline u64 btrfs_node_ptr_generation(struct extent_buffer *eb, int nr)
 854 {
 855         unsigned long ptr;
 856         ptr = offsetof(struct btrfs_node, ptrs) +
 857                 sizeof(struct btrfs_key_ptr) * nr;
 858         return btrfs_key_generation(eb, (struct btrfs_key_ptr *)ptr);
 859 }
 860
 861 static inline void btrfs_set_node_ptr_generation(struct extent_buffer *eb,
 862                                                  int nr, u64 val)
 863 {
 864         unsigned long ptr;
 865         ptr = offsetof(struct btrfs_node, ptrs) +
 866                 sizeof(struct btrfs_key_ptr) * nr;
 867         btrfs_set_key_generation(eb, (struct btrfs_key_ptr *)ptr, val);
 868 }
 869
 870 static inline unsigned long btrfs_node_key_ptr_offset(int nr)
 871 {
 872         return offsetof(struct btrfs_node, ptrs) +
 873                 sizeof(struct btrfs_key_ptr) * nr;
 874 }
 875
 876 static inline void btrfs_node_key(struct extent_buffer *eb,
 877                                   struct btrfs_disk_key *disk_key, int nr)
 878 {
 879         unsigned long ptr;
 880         ptr = btrfs_node_key_ptr_offset(nr);
 881         read_eb_member(eb, (struct btrfs_key_ptr *)ptr,
 882                        struct btrfs_key_ptr, key, disk_key);
 883 }
 884
 885 static inline void btrfs_set_node_key(struct extent_buffer *eb,
 886                                       struct btrfs_disk_key *disk_key, int nr)
 887 {
 888         unsigned long ptr;
 889         ptr = btrfs_node_key_ptr_offset(nr);
 890         write_eb_member(eb, (struct btrfs_key_ptr *)ptr,
 891                        struct btrfs_key_ptr, key, disk_key);
 892 }
 893
 894 /* struct btrfs_item */
 895 BTRFS_SETGET_FUNCS(item_offset, struct btrfs_item, offset, 32);
 896 BTRFS_SETGET_FUNCS(item_size, struct btrfs_item, size, 32);
 897
 898 static inline unsigned long btrfs_item_nr_offset(int nr)
 899 {
 900         return offsetof(struct btrfs_leaf, items) +
 901                 sizeof(struct btrfs_item) * nr;
 902 }
 903
 904 static inline struct btrfs_item *btrfs_item_nr(struct extent_buffer *eb,
 905                                                int nr)
 906 {
 907         return (struct btrfs_item *)btrfs_item_nr_offset(nr);
 908 }
 909
 910 static inline u32 btrfs_item_end(struct extent_buffer *eb,
 911                                  struct btrfs_item *item)
 912 {
 913         return btrfs_item_offset(eb, item) + btrfs_item_size(eb, item);
 914 }
 915
 916 static inline u32 btrfs_item_end_nr(struct extent_buffer *eb, int nr)
 917 {
 918         return btrfs_item_end(eb, btrfs_item_nr(eb, nr));
 919 }
 920
 921 static inline u32 btrfs_item_offset_nr(struct extent_buffer *eb, int nr)
 922 {
 923         return btrfs_item_offset(eb, btrfs_item_nr(eb, nr));
 924 }
 925
 926 static inline u32 btrfs_item_size_nr(struct extent_buffer *eb, int nr)
 927 {
 928         return btrfs_item_size(eb, btrfs_item_nr(eb, nr));
 929 }
 930
 931 static inline void btrfs_item_key(struct extent_buffer *eb,
 932                            struct btrfs_disk_key *disk_key, int nr)
 933 {
 934         struct btrfs_item *item = btrfs_item_nr(eb, nr);
 935         read_eb_member(eb, item, struct btrfs_item, key, disk_key);
 936 }
 937
 938 static inline void btrfs_set_item_key(struct extent_buffer *eb,
 939                                struct btrfs_disk_key *disk_key, int nr)
 940 {
 941         struct btrfs_item *item = btrfs_item_nr(eb, nr);
 942         write_eb_member(eb, item, struct btrfs_item, key, disk_key);
 943 }
 944
 945 /* struct btrfs_dir_item */
 946 BTRFS_SETGET_FUNCS(dir_data_len, struct btrfs_dir_item, data_len, 16);
 947 BTRFS_SETGET_FUNCS(dir_type, struct btrfs_dir_item, type, 8);
 948 BTRFS_SETGET_FUNCS(dir_name_len, struct btrfs_dir_item, name_len, 16);
 949
 950 static inline void btrfs_dir_item_key(struct extent_buffer *eb,
 951                                       struct btrfs_dir_item *item,
 952                                       struct btrfs_disk_key *key)
 953 {
 954         read_eb_member(eb, item, struct btrfs_dir_item, location, key);
 955 }
 956
 957 static inline void btrfs_set_dir_item_key(struct extent_buffer *eb,
 958                                           struct btrfs_dir_item *item,
 959                                           struct btrfs_disk_key *key)
 960 {
 961         write_eb_member(eb, item, struct btrfs_dir_item, location, key);
 962 }
 963
 964 /* struct btrfs_disk_key */
 965 BTRFS_SETGET_STACK_FUNCS(disk_key_objectid, struct btrfs_disk_key,
 966                          objectid, 64);
 967 BTRFS_SETGET_STACK_FUNCS(disk_key_offset, struct btrfs_disk_key, offset, 64);
 968 BTRFS_SETGET_STACK_FUNCS(disk_key_type, struct btrfs_disk_key, type, 8);
 969
 970 static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu,
 971                                          struct btrfs_disk_key *disk)
 972 {
 973         cpu->offset = le64_to_cpu(disk->offset);
 974         cpu->type = disk->type;
 975         cpu->objectid = le64_to_cpu(disk->objectid);
 976 }
 977
 978 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk,
 979                                          struct btrfs_key *cpu)
 980 {
 981         disk->offset = cpu_to_le64(cpu->offset);
 982         disk->type = cpu->type;
 983         disk->objectid = cpu_to_le64(cpu->objectid);
 984 }
 985
 986 static inline void btrfs_node_key_to_cpu(struct extent_buffer *eb,
 987                                   struct btrfs_key *key, int nr)
 988 {
 989         struct btrfs_disk_key disk_key;
 990         btrfs_node_key(eb, &disk_key, nr);
 991         btrfs_disk_key_to_cpu(key, &disk_key);
 992 }
 993
 994 static inline void btrfs_item_key_to_cpu(struct extent_buffer *eb,
 995                                   struct btrfs_key *key, int nr)
 996 {
 997         struct btrfs_disk_key disk_key;
 998         btrfs_item_key(eb, &disk_key, nr);
 999         btrfs_disk_key_to_cpu(key, &disk_key);
1000 }
1001
1002 static inline void btrfs_dir_item_key_to_cpu(struct extent_buffer *eb,
1003                                       struct btrfs_dir_item *item,
1004                                       struct btrfs_key *key)
1005 {
1006         struct btrfs_disk_key disk_key;
1007         btrfs_dir_item_key(eb, item, &disk_key);
1008         btrfs_disk_key_to_cpu(key, &disk_key);
1009 }
1010
1011
1012 static inline u8 btrfs_key_type(struct btrfs_key *key)
1013 {
1014         return key->type;
1015 }
1016
1017 static inline void btrfs_set_key_type(struct btrfs_key *key, u8 val)
1018 {
1019         key->type = val;
1020 }
1021
1022 /* struct btrfs_header */
1023 BTRFS_SETGET_HEADER_FUNCS(header_bytenr, struct btrfs_header, bytenr, 64);
1024 BTRFS_SETGET_HEADER_FUNCS(header_generation, struct btrfs_header,
1025                           generation, 64);
1026 BTRFS_SETGET_HEADER_FUNCS(header_owner, struct btrfs_header, owner, 64);
1027 BTRFS_SETGET_HEADER_FUNCS(header_nritems, struct btrfs_header, nritems, 32);
1028 BTRFS_SETGET_HEADER_FUNCS(header_flags, struct btrfs_header, flags, 16);
1029 BTRFS_SETGET_HEADER_FUNCS(header_level, struct btrfs_header, level, 8);
1030
1031 static inline u8 *btrfs_header_fsid(struct extent_buffer *eb)
1032 {
1033         unsigned long ptr = offsetof(struct btrfs_header, fsid);
1034         return (u8 *)ptr;
1035 }
1036
1037 static inline u8 *btrfs_super_fsid(struct extent_buffer *eb)
1038 {
1039         unsigned long ptr = offsetof(struct btrfs_super_block, fsid);
1040         return (u8 *)ptr;
1041 }
1042
1043 static inline u8 *btrfs_header_csum(struct extent_buffer *eb)
1044 {
1045         unsigned long ptr = offsetof(struct btrfs_header, csum);
1046         return (u8 *)ptr;
1047 }
1048
1049 static inline struct btrfs_node *btrfs_buffer_node(struct extent_buffer *eb)
1050 {
1051         return NULL;
1052 }
1053
1054 static inline struct btrfs_leaf *btrfs_buffer_leaf(struct extent_buffer *eb)
1055 {
1056         return NULL;
1057 }
1058
1059 static inline struct btrfs_header *btrfs_buffer_header(struct extent_buffer *eb)
1060 {
1061         return NULL;
1062 }
1063
1064 static inline int btrfs_is_leaf(struct extent_buffer *eb)
1065 {
1066         return (btrfs_header_level(eb) == 0);
1067 }
1068
1069 /* struct btrfs_root_item */
1070 BTRFS_SETGET_FUNCS(disk_root_refs, struct btrfs_root_item, refs, 32);
1071 BTRFS_SETGET_FUNCS(disk_root_bytenr, struct btrfs_root_item, bytenr, 64);
1072 BTRFS_SETGET_FUNCS(disk_root_level, struct btrfs_root_item, level, 8);
1073
1074 BTRFS_SETGET_STACK_FUNCS(root_bytenr, struct btrfs_root_item, bytenr, 64);
1075 BTRFS_SETGET_STACK_FUNCS(root_level, struct btrfs_root_item, level, 8);
1076 BTRFS_SETGET_STACK_FUNCS(root_dirid, struct btrfs_root_item, root_dirid, 64);
1077 BTRFS_SETGET_STACK_FUNCS(root_refs, struct btrfs_root_item, refs, 32);
1078 BTRFS_SETGET_STACK_FUNCS(root_flags, struct btrfs_root_item, flags, 32);
1079 BTRFS_SETGET_STACK_FUNCS(root_used, struct btrfs_root_item, bytes_used, 64);
1080 BTRFS_SETGET_STACK_FUNCS(root_limit, struct btrfs_root_item, byte_limit, 64);
1081
1082 /* struct btrfs_super_block */
1083 BTRFS_SETGET_STACK_FUNCS(super_bytenr, struct btrfs_super_block, bytenr, 64);
1084 BTRFS_SETGET_STACK_FUNCS(super_generation, struct btrfs_super_block,
1085                          generation, 64);
1086 BTRFS_SETGET_STACK_FUNCS(super_root, struct btrfs_super_block, root, 64);
1087 BTRFS_SETGET_STACK_FUNCS(super_sys_array_size,
1088                          struct btrfs_super_block, sys_chunk_array_size, 32);
1089 BTRFS_SETGET_STACK_FUNCS(super_root_level, struct btrfs_super_block,
1090                          root_level, 8);
1091 BTRFS_SETGET_STACK_FUNCS(super_chunk_root, struct btrfs_super_block,
1092                          chunk_root, 64);
1093 BTRFS_SETGET_STACK_FUNCS(super_chunk_root_level, struct btrfs_super_block,
1094                          chunk_root_level, 64);
1095 BTRFS_SETGET_STACK_FUNCS(super_total_bytes, struct btrfs_super_block,
1096                          total_bytes, 64);
1097 BTRFS_SETGET_STACK_FUNCS(super_bytes_used, struct btrfs_super_block,
1098                          bytes_used, 64);
1099 BTRFS_SETGET_STACK_FUNCS(super_sectorsize, struct btrfs_super_block,
1100                          sectorsize, 32);
1101 BTRFS_SETGET_STACK_FUNCS(super_nodesize, struct btrfs_super_block,
1102                          nodesize, 32);
1103 BTRFS_SETGET_STACK_FUNCS(super_leafsize, struct btrfs_super_block,
1104                          leafsize, 32);
1105 BTRFS_SETGET_STACK_FUNCS(super_stripesize, struct btrfs_super_block,
1106                          stripesize, 32);
1107 BTRFS_SETGET_STACK_FUNCS(super_root_dir, struct btrfs_super_block,
1108                          root_dir_objectid, 64);
1109 BTRFS_SETGET_STACK_FUNCS(super_num_devices, struct btrfs_super_block,
1110                          num_devices, 64);
1111
1112 static inline unsigned long btrfs_leaf_data(struct extent_buffer *l)
1113 {
1114         return offsetof(struct btrfs_leaf, items);
1115 }
1116
1117 /* struct btrfs_file_extent_item */
1118 BTRFS_SETGET_FUNCS(file_extent_type, struct btrfs_file_extent_item, type, 8);
1119
1120 static inline unsigned long btrfs_file_extent_inline_start(struct
1121                                                    btrfs_file_extent_item *e)
1122 {
1123         unsigned long offset = (unsigned long)e;
1124         offset += offsetof(struct btrfs_file_extent_item, disk_bytenr);
1125         return offset;
1126 }
1127
1128 static inline u32 btrfs_file_extent_calc_inline_size(u32 datasize)
1129 {
1130         return offsetof(struct btrfs_file_extent_item, disk_bytenr) + datasize;
1131 }
1132
1133 static inline u32 btrfs_file_extent_inline_len(struct extent_buffer *eb,
1134                                                struct btrfs_item *e)
1135 {
1136         unsigned long offset;
1137         offset = offsetof(struct btrfs_file_extent_item, disk_bytenr);
1138         return btrfs_item_size(eb, e) - offset;
1139 }
1140
1141 BTRFS_SETGET_FUNCS(file_extent_disk_bytenr, struct btrfs_file_extent_item,
1142                    disk_bytenr, 64);
1143 BTRFS_SETGET_FUNCS(file_extent_generation, struct btrfs_file_extent_item,
1144                    generation, 64);
1145 BTRFS_SETGET_FUNCS(file_extent_disk_num_bytes, struct btrfs_file_extent_item,
1146                    disk_num_bytes, 64);
1147 BTRFS_SETGET_FUNCS(file_extent_offset, struct btrfs_file_extent_item,
1148                   offset, 64);
1149 BTRFS_SETGET_FUNCS(file_extent_num_bytes, struct btrfs_file_extent_item,
1150                    num_bytes, 64);
1151
1152 static inline u32 btrfs_level_size(struct btrfs_root *root, int level) {
1153         if (level == 0)
1154                 return root->leafsize;
1155         return root->nodesize;
1156 }
1157
1158 /* helper function to cast into the data area of the leaf. */
1159 #define btrfs_item_ptr(leaf, slot, type) \
1160         ((type *)(btrfs_leaf_data(leaf) + \
1161         btrfs_item_offset_nr(leaf, slot)))
1162
1163 #define btrfs_item_ptr_offset(leaf, slot) \
1164         ((unsigned long)(btrfs_leaf_data(leaf) + \
1165         btrfs_item_offset_nr(leaf, slot)))
1166
1167 /* extent-tree.c */
1168 u32 btrfs_count_snapshots_in_path(struct btrfs_root *root,
1169                                   struct btrfs_path *count_path,
1170                                   u64 first_extent);
1171 int btrfs_extent_post_op(struct btrfs_trans_handle *trans,
1172                          struct btrfs_root *root);
1173 int btrfs_copy_pinned(struct btrfs_root *root, struct extent_io_tree *copy);
1174 struct btrfs_block_group_cache *btrfs_lookup_block_group(struct
1175                                                          btrfs_fs_info *info,
1176                                                          u64 bytenr);
1177 struct btrfs_block_group_cache *btrfs_find_block_group(struct btrfs_root *root,
1178                                                  struct btrfs_block_group_cache
1179                                                  *hint, u64 search_start,
1180                                                  int data, int owner);
1181 int btrfs_inc_root_ref(struct btrfs_trans_handle *trans,
1182                        struct btrfs_root *root, u64 owner_objectid);
1183 struct extent_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
1184                                             struct btrfs_root *root, u32 size,
1185                                             u64 root_objectid,
1186                                             u64 hint, u64 empty_size);
1187 struct extent_buffer *__btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
1188                                              struct btrfs_root *root,
1189                                              u32 blocksize,
1190                                              u64 root_objectid,
1191                                              u64 ref_generation,
1192                                              u64 first_objectid,
1193                                              int level,
1194                                              u64 hint,
1195                                              u64 empty_size);
1196 int btrfs_grow_extent_tree(struct btrfs_trans_handle *trans,
1197                            struct btrfs_root *root, u64 new_size);
1198 int btrfs_shrink_extent_tree(struct btrfs_root *root, u64 new_size);
1199 int btrfs_insert_extent_backref(struct btrfs_trans_handle *trans,
1200                                  struct btrfs_root *root,
1201                                  struct btrfs_path *path, u64 bytenr,
1202                                  u64 root_objectid, u64 ref_generation,
1203                                  u64 owner, u64 owner_offset);
1204 int btrfs_alloc_extent(struct btrfs_trans_handle *trans,
1205                        struct btrfs_root *root,
1206                        u64 num_bytes, u64 root_objectid, u64 ref_generation,
1207                        u64 owner, u64 owner_offset,
1208                        u64 empty_size, u64 hint_byte,
1209                        u64 search_end, struct btrfs_key *ins, int data);
1210 int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1211                   struct extent_buffer *buf);
1212 int btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
1213                       *root, u64 bytenr, u64 num_bytes,
1214                       u64 root_objectid, u64 ref_generation,
1215                       u64 owner_objectid, u64 owner_offset, int pin);
1216 int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans,
1217                                struct btrfs_root *root,
1218                                struct extent_io_tree *unpin);
1219 int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
1220                                 struct btrfs_root *root,
1221                                 u64 bytenr, u64 num_bytes,
1222                                 u64 root_objectid, u64 ref_generation,
1223                                 u64 owner, u64 owner_offset);
1224 int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans,
1225                                     struct btrfs_root *root);
1226 int btrfs_free_block_groups(struct btrfs_fs_info *info);
1227 int btrfs_read_block_groups(struct btrfs_root *root);
1228 int btrfs_make_block_group(struct btrfs_trans_handle *trans,
1229                            struct btrfs_root *root, u64 bytes_used,
1230                            u64 type, u64 chunk_tree, u64 chunk_objectid,
1231                            u64 size);
1232 u64 btrfs_hash_extent_ref(u64 root_objectid, u64 ref_generation,
1233                           u64 owner, u64 owner_offset);
1234 int btrfs_update_block_group(struct btrfs_trans_handle *trans,
1235                              struct btrfs_root *root, u64 bytenr, u64 num,
1236                              int alloc, int mark_free);
1237 /* ctree.c */
1238 int btrfs_previous_item(struct btrfs_root *root,
1239                         struct btrfs_path *path, u64 min_objectid,
1240                         int type);
1241 int btrfs_comp_keys(struct btrfs_disk_key *disk, struct btrfs_key *k2);
1242 int btrfs_cow_block(struct btrfs_trans_handle *trans,
1243                     struct btrfs_root *root, struct extent_buffer *buf,
1244                     struct extent_buffer *parent, int parent_slot,
1245                     struct extent_buffer **cow_ret);
1246 int btrfs_copy_root(struct btrfs_trans_handle *trans,
1247                       struct btrfs_root *root,
1248                       struct extent_buffer *buf,
1249                       struct extent_buffer **cow_ret, u64 new_root_objectid);
1250 int btrfs_extend_item(struct btrfs_trans_handle *trans, struct btrfs_root
1251                       *root, struct btrfs_path *path, u32 data_size);
1252 int btrfs_truncate_item(struct btrfs_trans_handle *trans,
1253                         struct btrfs_root *root,
1254                         struct btrfs_path *path,
1255                         u32 new_size, int from_end);
1256 int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root
1257                       *root, struct btrfs_key *key, struct btrfs_path *p, int
1258                       ins_len, int cow);
1259 int btrfs_realloc_node(struct btrfs_trans_handle *trans,
1260                        struct btrfs_root *root, struct extent_buffer *parent,
1261                        int start_slot, int cache_only, u64 *last_ret,
1262                        struct btrfs_key *progress);
1263 void btrfs_release_path(struct btrfs_root *root, struct btrfs_path *p);
1264 struct btrfs_path *btrfs_alloc_path(void);
1265 void btrfs_free_path(struct btrfs_path *p);
1266 void btrfs_init_path(struct btrfs_path *p);
1267 int btrfs_del_items(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1268                    struct btrfs_path *path, int slot, int nr);
1269
1270 static inline int btrfs_del_item(struct btrfs_trans_handle *trans,
1271                                  struct btrfs_root *root,
1272                                  struct btrfs_path *path)
1273 {
1274         return btrfs_del_items(trans, root, path, path->slots[0], 1);
1275 }
1276
1277 int btrfs_insert_item(struct btrfs_trans_handle *trans, struct btrfs_root
1278                       *root, struct btrfs_key *key, void *data, u32 data_size);
1279 int btrfs_insert_empty_items(struct btrfs_trans_handle *trans,
1280                              struct btrfs_root *root,
1281                              struct btrfs_path *path,
1282                              struct btrfs_key *cpu_key, u32 *data_size, int nr);
1283
1284 static inline int btrfs_insert_empty_item(struct btrfs_trans_handle *trans,
1285                                           struct btrfs_root *root,
1286                                           struct btrfs_path *path,
1287                                           struct btrfs_key *key,
1288                                           u32 data_size)
1289 {
1290         return btrfs_insert_empty_items(trans, root, path, key, &data_size, 1);
1291 }
1292
1293 int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path);
1294 int btrfs_prev_leaf(struct btrfs_root *root, struct btrfs_path *path);
1295 int btrfs_leaf_free_space(struct btrfs_root *root, struct extent_buffer *leaf);
1296 int btrfs_drop_snapshot(struct btrfs_trans_handle *trans, struct btrfs_root
1297                         *root);
1298
1299
1300 /* root-item.c */
1301 int btrfs_del_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1302                    struct btrfs_key *key);
1303 int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root
1304                       *root, struct btrfs_key *key, struct btrfs_root_item
1305                       *item);
1306 int btrfs_update_root(struct btrfs_trans_handle *trans, struct btrfs_root
1307                       *root, struct btrfs_key *key, struct btrfs_root_item
1308                       *item);
1309 int btrfs_find_last_root(struct btrfs_root *root, u64 objectid, struct
1310                          btrfs_root_item *item, struct btrfs_key *key);
1311 int btrfs_find_dead_roots(struct btrfs_root *root, u64 objectid,
1312                           struct btrfs_root *latest_root);
1313 /* dir-item.c */
1314 int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
1315                           *root, const char *name, int name_len, u64 dir,
1316                           struct btrfs_key *location, u8 type);
1317 struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans,
1318                                              struct btrfs_root *root,
1319                                              struct btrfs_path *path, u64 dir,
1320                                              const char *name, int name_len,
1321                                              int mod);
1322 struct btrfs_dir_item *
1323 btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans,
1324                             struct btrfs_root *root,
1325                             struct btrfs_path *path, u64 dir,
1326                             u64 objectid, const char *name, int name_len,
1327                             int mod);
1328 struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_root *root,
1329                               struct btrfs_path *path,
1330                               const char *name, int name_len);
1331 int btrfs_delete_one_dir_name(struct btrfs_trans_handle *trans,
1332                               struct btrfs_root *root,
1333                               struct btrfs_path *path,
1334                               struct btrfs_dir_item *di);
1335 int btrfs_insert_xattr_item(struct btrfs_trans_handle *trans,
1336                             struct btrfs_root *root, const char *name,
1337                             u16 name_len, const void *data, u16 data_len,
1338                             u64 dir);
1339 struct btrfs_dir_item *btrfs_lookup_xattr(struct btrfs_trans_handle *trans,
1340                                           struct btrfs_root *root,
1341                                           struct btrfs_path *path, u64 dir,
1342                                           const char *name, u16 name_len,
1343                                           int mod);
1344 /* inode-map.c */
1345 int btrfs_find_free_objectid(struct btrfs_trans_handle *trans,
1346                              struct btrfs_root *fs_root,
1347                              u64 dirid, u64 *objectid);
1348 int btrfs_find_highest_inode(struct btrfs_root *fs_root, u64 *objectid);
1349
1350 /* inode-item.c */
1351 int btrfs_insert_inode_ref(struct btrfs_trans_handle *trans,
1352                            struct btrfs_root *root,
1353                            const char *name, int name_len,
1354                            u64 inode_objectid, u64 ref_objectid);
1355 int btrfs_del_inode_ref(struct btrfs_trans_handle *trans,
1356                            struct btrfs_root *root,
1357                            const char *name, int name_len,
1358                            u64 inode_objectid, u64 ref_objectid);
1359 int btrfs_insert_empty_inode(struct btrfs_trans_handle *trans,
1360                              struct btrfs_root *root,
1361                              struct btrfs_path *path, u64 objectid);
1362 int btrfs_insert_inode(struct btrfs_trans_handle *trans, struct btrfs_root
1363                        *root, u64 objectid, struct btrfs_inode_item
1364                        *inode_item);
1365 int btrfs_lookup_inode(struct btrfs_trans_handle *trans, struct btrfs_root
1366                        *root, struct btrfs_path *path,
1367                        struct btrfs_key *location, int mod);
1368
1369 /* file-item.c */
1370 int btrfs_insert_file_extent(struct btrfs_trans_handle *trans,
1371                              struct btrfs_root *root,
1372                              u64 objectid, u64 pos, u64 offset,
1373                              u64 disk_num_bytes,
1374                              u64 num_bytes);
1375 int btrfs_insert_inline_extent(struct btrfs_trans_handle *trans,
1376                                 struct btrfs_root *root, u64 objectid,
1377                                 u64 offset, char *buffer, size_t size);
1378 int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
1379                              struct btrfs_root *root,
1380                              struct btrfs_path *path, u64 objectid,
1381                              u64 bytenr, int mod);
1382 int btrfs_csum_file_block(struct btrfs_trans_handle *trans,
1383                           struct btrfs_root *root,
1384                           struct btrfs_inode_item *inode,
1385                           u64 objectid, u64 offset,
1386                           char *data, size_t len);
1387 struct btrfs_csum_item *btrfs_lookup_csum(struct btrfs_trans_handle *trans,
1388                                           struct btrfs_root *root,
1389                                           struct btrfs_path *path,
1390                                           u64 objectid, u64 offset,
1391                                           int cow);
1392 int btrfs_csum_truncate(struct btrfs_trans_handle *trans,
1393                         struct btrfs_root *root, struct btrfs_path *path,
1394                         u64 isize);
1395 #endif