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 "_B5RfS_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 #define BTRFS_HEADER_FLAG_WRITTEN (1 << 0)
 186
 187 /*
 188  * every tree block (leaf or node) starts with this header.
 189  */
 190 struct btrfs_header {
 191         u8 csum[BTRFS_CSUM_SIZE];
 192         u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
 193         __le64 bytenr; /* which block this node is supposed to live in */
 194         __le64 flags;
 195         __le64 generation;
 196         __le64 owner;
 197         __le32 nritems;
 198         u8 level;
 199 } __attribute__ ((__packed__));
 200
 201 #define BTRFS_NODEPTRS_PER_BLOCK(r) (((r)->nodesize - \
 202                                 sizeof(struct btrfs_header)) / \
 203                                 sizeof(struct btrfs_key_ptr))
 204 #define __BTRFS_LEAF_DATA_SIZE(bs) ((bs) - sizeof(struct btrfs_header))
 205 #define BTRFS_LEAF_DATA_SIZE(r) (__BTRFS_LEAF_DATA_SIZE(r->leafsize))
 206 #define BTRFS_MAX_INLINE_DATA_SIZE(r) (BTRFS_LEAF_DATA_SIZE(r) - \
 207                                         sizeof(struct btrfs_item) - \
 208                                         sizeof(struct btrfs_file_extent_item))
 209
 210 /*
 211  * this is a very generous portion of the super block, giving us
 212  * room to translate 14 chunks with 3 stripes each.
 213  */
 214 #define BTRFS_SYSTEM_CHUNK_ARRAY_SIZE 2048
 215
 216 /*
 217  * the super block basically lists the main trees of the FS
 218  * it currently lacks any block count etc etc
 219  */
 220 struct btrfs_super_block {
 221         u8 csum[BTRFS_CSUM_SIZE];
 222         /* the first 3 fields must match struct btrfs_header */
 223         u8 fsid[BTRFS_FSID_SIZE];    /* FS specific uuid */
 224         __le64 bytenr; /* this block number */
 225         __le64 flags;
 226         __le64 magic;
 227         __le64 generation;
 228         __le64 root;
 229         __le64 chunk_root;
 230         __le64 total_bytes;
 231         __le64 bytes_used;
 232         __le64 root_dir_objectid;
 233         __le64 num_devices;
 234         __le32 sectorsize;
 235         __le32 nodesize;
 236         __le32 leafsize;
 237         __le32 stripesize;
 238         __le32 sys_chunk_array_size;
 239         u8 root_level;
 240         u8 chunk_root_level;
 241         struct btrfs_dev_item dev_item;
 242         u8 sys_chunk_array[BTRFS_SYSTEM_CHUNK_ARRAY_SIZE];
 243 } __attribute__ ((__packed__));
 244
 245 /*
 246  * A leaf is full of items. offset and size tell us where to find
 247  * the item in the leaf (relative to the start of the data area)
 248  */
 249 struct btrfs_item {
 250         struct btrfs_disk_key key;
 251         __le32 offset;
 252         __le32 size;
 253 } __attribute__ ((__packed__));
 254
 255 /*
 256  * leaves have an item area and a data area:
 257  * [item0, item1....itemN] [free space] [dataN...data1, data0]
 258  *
 259  * The data is separate from the items to get the keys closer together
 260  * during searches.
 261  */
 262 struct btrfs_leaf {
 263         struct btrfs_header header;
 264         struct btrfs_item items[];
 265 } __attribute__ ((__packed__));
 266
 267 /*
 268  * all non-leaf blocks are nodes, they hold only keys and pointers to
 269  * other blocks
 270  */
 271 struct btrfs_key_ptr {
 272         struct btrfs_disk_key key;
 273         __le64 blockptr;
 274         __le64 generation;
 275 } __attribute__ ((__packed__));
 276
 277 struct btrfs_node {
 278         struct btrfs_header header;
 279         struct btrfs_key_ptr ptrs[];
 280 } __attribute__ ((__packed__));
 281
 282 /*
 283  * btrfs_paths remember the path taken from the root down to the leaf.
 284  * level 0 is always the leaf, and nodes[1...BTRFS_MAX_LEVEL] will point
 285  * to any other levels that are present.
 286  *
 287  * The slots array records the index of the item or block pointer
 288  * used while walking the tree.
 289  */
 290 struct btrfs_path {
 291         struct extent_buffer *nodes[BTRFS_MAX_LEVEL];
 292         int slots[BTRFS_MAX_LEVEL];
 293         int reada;
 294         int lowest_level;
 295 };
 296
 297 /*
 298  * items in the extent btree are used to record the objectid of the
 299  * owner of the block and the number of references
 300  */
 301 struct btrfs_extent_item {
 302         __le32 refs;
 303 } __attribute__ ((__packed__));
 304
 305 struct btrfs_extent_ref {
 306         __le64 root;
 307         __le64 generation;
 308         __le64 objectid;
 309         __le64 offset;
 310 } __attribute__ ((__packed__));
 311
 312 /* dev extents record free space on individual devices.  The owner
 313  * field points back to the chunk allocation mapping tree that allocated
 314  * the extent
 315  */
 316 struct btrfs_dev_extent {
 317         __le64 owner;
 318         __le64 length;
 319 } __attribute__ ((__packed__));
 320
 321
 322 struct btrfs_inode_ref {
 323         __le16 name_len;
 324         /* name goes here */
 325 } __attribute__ ((__packed__));
 326
 327 struct btrfs_timespec {
 328         __le64 sec;
 329         __le32 nsec;
 330 } __attribute__ ((__packed__));
 331
 332 /*
 333  * there is no padding here on purpose.  If you want to extent the inode,
 334  * make a new item type
 335  */
 336 struct btrfs_inode_item {
 337         __le64 generation;
 338         __le64 size;
 339         __le64 nblocks;
 340         __le64 block_group;
 341         __le32 nlink;
 342         __le32 uid;
 343         __le32 gid;
 344         __le32 mode;
 345         __le64 rdev;
 346         __le16 flags;
 347         __le16 compat_flags;
 348         struct btrfs_timespec atime;
 349         struct btrfs_timespec ctime;
 350         struct btrfs_timespec mtime;
 351         struct btrfs_timespec otime;
 352 } __attribute__ ((__packed__));
 353
 354 struct btrfs_dir_item {
 355         struct btrfs_disk_key location;
 356         __le16 data_len;
 357         __le16 name_len;
 358         u8 type;
 359 } __attribute__ ((__packed__));
 360
 361 struct btrfs_root_item {
 362         struct btrfs_inode_item inode;
 363         __le64 root_dirid;
 364         __le64 bytenr;
 365         __le64 byte_limit;
 366         __le64 bytes_used;
 367         __le32 flags;
 368         __le32 refs;
 369         struct btrfs_disk_key drop_progress;
 370         u8 drop_level;
 371         u8 level;
 372 } __attribute__ ((__packed__));
 373
 374 #define BTRFS_FILE_EXTENT_REG 0
 375 #define BTRFS_FILE_EXTENT_INLINE 1
 376
 377 struct btrfs_file_extent_item {
 378         __le64 generation;
 379         u8 type;
 380         /*
 381          * disk space consumed by the extent, checksum blocks are included
 382          * in these numbers
 383          */
 384         __le64 disk_bytenr;
 385         __le64 disk_num_bytes;
 386         /*
 387          * the logical offset in file blocks (no csums)
 388          * this extent record is for.  This allows a file extent to point
 389          * into the middle of an existing extent on disk, sharing it
 390          * between two snapshots (useful if some bytes in the middle of the
 391          * extent have changed
 392          */
 393         __le64 offset;
 394         /*
 395          * the logical number of file blocks (no csums included)
 396          */
 397         __le64 num_bytes;
 398 } __attribute__ ((__packed__));
 399
 400 struct btrfs_csum_item {
 401         u8 csum;
 402 } __attribute__ ((__packed__));
 403
 404 /* tag for the radix tree of block groups in ram */
 405 #define BTRFS_BLOCK_GROUP_DATA     (1 << 0)
 406 #define BTRFS_BLOCK_GROUP_SYSTEM   (1 << 1)
 407 #define BTRFS_BLOCK_GROUP_METADATA (1 << 2)
 408 #define BTRFS_BLOCK_GROUP_RAID0    (1 << 3)
 409
 410 struct btrfs_block_group_item {
 411         __le64 used;
 412         __le64 chunk_tree;
 413         __le64 chunk_objectid;
 414         __le64 flags;
 415 } __attribute__ ((__packed__));
 416
 417 struct btrfs_space_info {
 418         u64 flags;
 419         u64 total_bytes;
 420         u64 bytes_used;
 421         u64 bytes_pinned;
 422         int full;
 423         struct list_head list;
 424 };
 425
 426 struct btrfs_block_group_cache {
 427         struct cache_extent cache;
 428         struct btrfs_key key;
 429         struct btrfs_block_group_item item;
 430         struct btrfs_space_info *space_info;
 431         u64 pinned;
 432         u64 flags;
 433         int cached;
 434 };
 435
 436 struct btrfs_extent_ops {
 437        int (*alloc_extent)(struct btrfs_root *root, u64 num_bytes,
 438                            u64 hint_byte, struct btrfs_key *ins);
 439        int (*free_extent)(struct btrfs_root *root, u64 bytenr,
 440                           u64 num_bytes);
 441 };
 442
 443 struct btrfs_device;
 444 struct btrfs_fs_devices;
 445 struct btrfs_fs_info {
 446         u8 fsid[BTRFS_FSID_SIZE];
 447         struct btrfs_root *fs_root;
 448         struct btrfs_root *extent_root;
 449         struct btrfs_root *tree_root;
 450         struct btrfs_root *chunk_root;
 451         struct btrfs_root *dev_root;
 452
 453         struct extent_io_tree extent_cache;
 454         struct extent_io_tree free_space_cache;
 455         struct extent_io_tree block_group_cache;
 456         struct extent_io_tree pinned_extents;
 457         struct extent_io_tree pending_del;
 458         struct extent_io_tree extent_ins;
 459
 460         /* logical->physical extent mapping */
 461         struct btrfs_mapping_tree mapping_tree;
 462
 463         u64 generation;
 464         u64 last_trans_committed;
 465         struct btrfs_trans_handle *running_transaction;
 466         struct btrfs_super_block super_copy;
 467         struct extent_buffer *sb_buffer;
 468         struct mutex fs_mutex;
 469         u64 total_pinned;
 470
 471         struct btrfs_extent_ops *extent_ops;
 472         struct list_head dirty_cowonly_roots;
 473
 474         struct btrfs_fs_devices *fs_devices;
 475         struct list_head space_info;
 476         int fp;
 477         int force_system_allocs;
 478         void *priv_data;
 479 };
 480
 481 /*
 482  * in ram representation of the tree.  extent_root is used for all allocations
 483  * and for the extent tree extent_root root.
 484  */
 485 struct btrfs_root {
 486         struct extent_buffer *node;
 487         struct extent_buffer *commit_root;
 488         struct btrfs_root_item root_item;
 489         struct btrfs_key root_key;
 490         struct btrfs_fs_info *fs_info;
 491         u64 objectid;
 492         u64 last_trans;
 493
 494         /* data allocations are done in sectorsize units */
 495         u32 sectorsize;
 496
 497         /* node allocations are done in nodesize units */
 498         u32 nodesize;
 499
 500         /* leaf allocations are done in leafsize units */
 501         u32 leafsize;
 502
 503         /* leaf allocations are done in leafsize units */
 504         u32 stripesize;
 505
 506         int ref_cows;
 507         int track_dirty;
 508
 509
 510         u32 type;
 511         u64 highest_inode;
 512         u64 last_inode_alloc;
 513
 514         /* the dirty list is only used by non-reference counted roots */
 515         struct list_head dirty_list;
 516 };
 517
 518 /*
 519  * inode items have the data typically returned from stat and store other
 520  * info about object characteristics.  There is one for every file and dir in
 521  * the FS
 522  */
 523 #define BTRFS_INODE_ITEM_KEY            1
 524 #define BTRFS_INODE_REF_KEY             2
 525 #define BTRFS_XATTR_ITEM_KEY            8
 526
 527 /* reserve 3-15 close to the inode for later flexibility */
 528
 529 /*
 530  * dir items are the name -> inode pointers in a directory.  There is one
 531  * for every name in a directory.
 532  */
 533 #define BTRFS_DIR_ITEM_KEY      16
 534 #define BTRFS_DIR_INDEX_KEY     17
 535 /*
 536  * extent data is for file data
 537  */
 538 #define BTRFS_EXTENT_DATA_KEY   18
 539 /*
 540  * csum items have the checksums for data in the extents
 541  */
 542 #define BTRFS_CSUM_ITEM_KEY     19
 543
 544 /* reserve 20-31 for other file stuff */
 545
 546 /*
 547  * root items point to tree roots.  There are typically in the root
 548  * tree used by the super block to find all the other trees
 549  */
 550 #define BTRFS_ROOT_ITEM_KEY     32
 551 /*
 552  * extent items are in the extent map tree.  These record which blocks
 553  * are used, and how many references there are to each block
 554  */
 555 #define BTRFS_EXTENT_ITEM_KEY   33
 556 #define BTRFS_EXTENT_REF_KEY    34
 557
 558 /*
 559  * block groups give us hints into the extent allocation trees.  Which
 560  * blocks are free etc etc
 561  */
 562 #define BTRFS_BLOCK_GROUP_ITEM_KEY 50
 563
 564 #define BTRFS_DEV_EXTENT_KEY    75
 565 #define BTRFS_DEV_ITEM_KEY      76
 566 #define BTRFS_CHUNK_ITEM_KEY    77
 567
 568 /*
 569  * string items are for debugging.  They just store a short string of
 570  * data in the FS
 571  */
 572 #define BTRFS_STRING_ITEM_KEY   253
 573 /*
 574  * Inode flags
 575  */
 576 #define BTRFS_INODE_NODATASUM           (1 << 0)
 577 #define BTRFS_INODE_NODATACOW           (1 << 1)
 578 #define BTRFS_INODE_READONLY            (1 << 2)
 579
 580 #define read_eb_member(eb, ptr, type, member, result) (                 \
 581         read_extent_buffer(eb, (char *)(result),                        \
 582                            ((unsigned long)(ptr)) +                     \
 583                             offsetof(type, member),                     \
 584                            sizeof(((type *)0)->member)))
 585
 586 #define write_eb_member(eb, ptr, type, member, result) (                \
 587         write_extent_buffer(eb, (char *)(result),                       \
 588                            ((unsigned long)(ptr)) +                     \
 589                             offsetof(type, member),                     \
 590                            sizeof(((type *)0)->member)))
 591
 592 #define BTRFS_SETGET_HEADER_FUNCS(name, type, member, bits)             \
 593 static inline u##bits btrfs_##name(struct extent_buffer *eb)            \
 594 {                                                                       \
 595         struct btrfs_header *h = (struct btrfs_header *)eb->data;       \
 596         return le##bits##_to_cpu(h->member);                            \
 597 }                                                                       \
 598 static inline void btrfs_set_##name(struct extent_buffer *eb,           \
 599                                     u##bits val)                        \
 600 {                                                                       \
 601         struct btrfs_header *h = (struct btrfs_header *)eb->data;       \
 602         h->member = cpu_to_le##bits(val);                               \
 603 }
 604
 605 #define BTRFS_SETGET_FUNCS(name, type, member, bits)                    \
 606 static inline u##bits btrfs_##name(struct extent_buffer *eb,            \
 607                                    type *s)                             \
 608 {                                                                       \
 609         unsigned long offset = (unsigned long)s;                        \
 610         type *p = (type *) (eb->data + offset);                         \
 611         return le##bits##_to_cpu(p->member);                            \
 612 }                                                                       \
 613 static inline void btrfs_set_##name(struct extent_buffer *eb,           \
 614                                     type *s, u##bits val)               \
 615 {                                                                       \
 616         unsigned long offset = (unsigned long)s;                        \
 617         type *p = (type *) (eb->data + offset);                         \
 618         p->member = cpu_to_le##bits(val);                               \
 619 }
 620
 621 #define BTRFS_SETGET_STACK_FUNCS(name, type, member, bits)              \
 622 static inline u##bits btrfs_##name(type *s)                             \
 623 {                                                                       \
 624         return le##bits##_to_cpu(s->member);                            \
 625 }                                                                       \
 626 static inline void btrfs_set_##name(type *s, u##bits val)               \
 627 {                                                                       \
 628         s->member = cpu_to_le##bits(val);                               \
 629 }
 630
 631 BTRFS_SETGET_FUNCS(device_type, struct btrfs_dev_item, type, 64);
 632 BTRFS_SETGET_FUNCS(device_total_bytes, struct btrfs_dev_item, total_bytes, 64);
 633 BTRFS_SETGET_FUNCS(device_bytes_used, struct btrfs_dev_item, bytes_used, 64);
 634 BTRFS_SETGET_FUNCS(device_io_align, struct btrfs_dev_item, io_align, 32);
 635 BTRFS_SETGET_FUNCS(device_io_width, struct btrfs_dev_item, io_width, 32);
 636 BTRFS_SETGET_FUNCS(device_sector_size, struct btrfs_dev_item, sector_size, 32);
 637 BTRFS_SETGET_FUNCS(device_id, struct btrfs_dev_item, devid, 64);
 638
 639 BTRFS_SETGET_STACK_FUNCS(stack_device_type, struct btrfs_dev_item, type, 64);
 640 BTRFS_SETGET_STACK_FUNCS(stack_device_total_bytes, struct btrfs_dev_item,
 641                          total_bytes, 64);
 642 BTRFS_SETGET_STACK_FUNCS(stack_device_bytes_used, struct btrfs_dev_item,
 643                          bytes_used, 64);
 644 BTRFS_SETGET_STACK_FUNCS(stack_device_io_align, struct btrfs_dev_item,
 645                          io_align, 32);
 646 BTRFS_SETGET_STACK_FUNCS(stack_device_io_width, struct btrfs_dev_item,
 647                          io_width, 32);
 648 BTRFS_SETGET_STACK_FUNCS(stack_device_sector_size, struct btrfs_dev_item,
 649                          sector_size, 32);
 650 BTRFS_SETGET_STACK_FUNCS(stack_device_id, struct btrfs_dev_item, devid, 64);
 651
 652 static inline char *btrfs_device_uuid(struct btrfs_dev_item *d)
 653 {
 654         return (char *)d + offsetof(struct btrfs_dev_item, uuid);
 655 }
 656
 657 BTRFS_SETGET_FUNCS(chunk_owner, struct btrfs_chunk, owner, 64);
 658 BTRFS_SETGET_FUNCS(chunk_stripe_len, struct btrfs_chunk, stripe_len, 64);
 659 BTRFS_SETGET_FUNCS(chunk_io_align, struct btrfs_chunk, io_align, 32);
 660 BTRFS_SETGET_FUNCS(chunk_io_width, struct btrfs_chunk, io_width, 32);
 661 BTRFS_SETGET_FUNCS(chunk_sector_size, struct btrfs_chunk, sector_size, 32);
 662 BTRFS_SETGET_FUNCS(chunk_type, struct btrfs_chunk, type, 64);
 663 BTRFS_SETGET_FUNCS(chunk_num_stripes, struct btrfs_chunk, num_stripes, 16);
 664 BTRFS_SETGET_FUNCS(stripe_devid, struct btrfs_stripe, devid, 64);
 665 BTRFS_SETGET_FUNCS(stripe_offset, struct btrfs_stripe, offset, 64);
 666
 667 BTRFS_SETGET_STACK_FUNCS(stack_chunk_owner, struct btrfs_chunk, owner, 64);
 668 BTRFS_SETGET_STACK_FUNCS(stack_chunk_stripe_len, struct btrfs_chunk,
 669                          stripe_len, 64);
 670 BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_align, struct btrfs_chunk,
 671                          io_align, 32);
 672 BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_width, struct btrfs_chunk,
 673                          io_width, 32);
 674 BTRFS_SETGET_STACK_FUNCS(stack_chunk_sector_size, struct btrfs_chunk,
 675                          sector_size, 32);
 676 BTRFS_SETGET_STACK_FUNCS(stack_chunk_type, struct btrfs_chunk, type, 64);
 677 BTRFS_SETGET_STACK_FUNCS(stack_chunk_num_stripes, struct btrfs_chunk,
 678                          num_stripes, 16);
 679 BTRFS_SETGET_STACK_FUNCS(stack_stripe_devid, struct btrfs_stripe, devid, 64);
 680 BTRFS_SETGET_STACK_FUNCS(stack_stripe_offset, struct btrfs_stripe, offset, 64);
 681
 682 static inline struct btrfs_stripe *btrfs_stripe_nr(struct btrfs_chunk *c,
 683                                                    int nr)
 684 {
 685         unsigned long offset = (unsigned long)c;
 686         offset += offsetof(struct btrfs_chunk, stripe);
 687         offset += nr * sizeof(struct btrfs_stripe);
 688         return (struct btrfs_stripe *)offset;
 689 }
 690
 691 static inline u64 btrfs_stripe_offset_nr(struct extent_buffer *eb,
 692                                          struct btrfs_chunk *c, int nr)
 693 {
 694         return btrfs_stripe_offset(eb, btrfs_stripe_nr(c, nr));
 695 }
 696
 697 static inline void btrfs_set_stripe_offset_nr(struct extent_buffer *eb,
 698                                              struct btrfs_chunk *c, int nr,
 699                                              u64 val)
 700 {
 701         btrfs_set_stripe_offset(eb, btrfs_stripe_nr(c, nr), val);
 702 }
 703
 704 static inline u64 btrfs_stripe_devid_nr(struct extent_buffer *eb,
 705                                          struct btrfs_chunk *c, int nr)
 706 {
 707         return btrfs_stripe_devid(eb, btrfs_stripe_nr(c, nr));
 708 }
 709
 710 static inline void btrfs_set_stripe_devid_nr(struct extent_buffer *eb,
 711                                              struct btrfs_chunk *c, int nr,
 712                                              u64 val)
 713 {
 714         btrfs_set_stripe_devid(eb, btrfs_stripe_nr(c, nr), val);
 715 }
 716
 717 /* struct btrfs_block_group_item */
 718 BTRFS_SETGET_STACK_FUNCS(block_group_used, struct btrfs_block_group_item,
 719                          used, 64);
 720 BTRFS_SETGET_FUNCS(disk_block_group_used, struct btrfs_block_group_item,
 721                          used, 64);
 722 BTRFS_SETGET_STACK_FUNCS(block_group_chunk_tree, struct btrfs_block_group_item,
 723                          chunk_tree, 64);
 724 BTRFS_SETGET_FUNCS(disk_block_group_chunk_tree, struct btrfs_block_group_item,
 725                          chunk_tree, 64);
 726 BTRFS_SETGET_STACK_FUNCS(block_group_chunk_objectid,
 727                         struct btrfs_block_group_item, chunk_objectid, 64);
 728 BTRFS_SETGET_FUNCS(disk_block_group_chunk_objecitd,
 729                    struct btrfs_block_group_item, chunk_objectid, 64);
 730 BTRFS_SETGET_FUNCS(disk_block_group_flags,
 731                    struct btrfs_block_group_item, flags, 64);
 732 BTRFS_SETGET_STACK_FUNCS(block_group_flags,
 733                         struct btrfs_block_group_item, flags, 64);
 734
 735 /* struct btrfs_inode_ref */
 736 BTRFS_SETGET_FUNCS(inode_ref_name_len, struct btrfs_inode_ref, name_len, 16);
 737
 738 /* struct btrfs_inode_item */
 739 BTRFS_SETGET_FUNCS(inode_generation, struct btrfs_inode_item, generation, 64);
 740 BTRFS_SETGET_FUNCS(inode_size, struct btrfs_inode_item, size, 64);
 741 BTRFS_SETGET_FUNCS(inode_nblocks, struct btrfs_inode_item, nblocks, 64);
 742 BTRFS_SETGET_FUNCS(inode_block_group, struct btrfs_inode_item, block_group, 64);
 743 BTRFS_SETGET_FUNCS(inode_nlink, struct btrfs_inode_item, nlink, 32);
 744 BTRFS_SETGET_FUNCS(inode_uid, struct btrfs_inode_item, uid, 32);
 745 BTRFS_SETGET_FUNCS(inode_gid, struct btrfs_inode_item, gid, 32);
 746 BTRFS_SETGET_FUNCS(inode_mode, struct btrfs_inode_item, mode, 32);
 747 BTRFS_SETGET_FUNCS(inode_rdev, struct btrfs_inode_item, rdev, 64);
 748 BTRFS_SETGET_FUNCS(inode_flags, struct btrfs_inode_item, flags, 16);
 749 BTRFS_SETGET_FUNCS(inode_compat_flags, struct btrfs_inode_item,
 750                    compat_flags, 16);
 751
 752 BTRFS_SETGET_STACK_FUNCS(stack_inode_generation,
 753                          struct btrfs_inode_item, generation, 64);
 754 BTRFS_SETGET_STACK_FUNCS(stack_inode_size,
 755                          struct btrfs_inode_item, size, 64);
 756 BTRFS_SETGET_STACK_FUNCS(stack_inode_nblocks,
 757                          struct btrfs_inode_item, nblocks, 64);
 758 BTRFS_SETGET_STACK_FUNCS(stack_inode_block_group,
 759                          struct btrfs_inode_item, block_group, 64);
 760 BTRFS_SETGET_STACK_FUNCS(stack_inode_nlink,
 761                          struct btrfs_inode_item, nlink, 32);
 762 BTRFS_SETGET_STACK_FUNCS(stack_inode_uid,
 763                          struct btrfs_inode_item, uid, 32);
 764 BTRFS_SETGET_STACK_FUNCS(stack_inode_gid,
 765                          struct btrfs_inode_item, gid, 32);
 766 BTRFS_SETGET_STACK_FUNCS(stack_inode_mode,
 767                          struct btrfs_inode_item, mode, 32);
 768 BTRFS_SETGET_STACK_FUNCS(stack_inode_rdev,
 769                          struct btrfs_inode_item, rdev, 64);
 770 BTRFS_SETGET_STACK_FUNCS(stack_inode_flags,
 771                          struct btrfs_inode_item, flags, 16);
 772 BTRFS_SETGET_STACK_FUNCS(stack_inode_compat_flags,
 773                          struct btrfs_inode_item, compat_flags, 16);
 774
 775 static inline struct btrfs_timespec *
 776 btrfs_inode_atime(struct btrfs_inode_item *inode_item)
 777 {
 778         unsigned long ptr = (unsigned long)inode_item;
 779         ptr += offsetof(struct btrfs_inode_item, atime);
 780         return (struct btrfs_timespec *)ptr;
 781 }
 782
 783 static inline struct btrfs_timespec *
 784 btrfs_inode_mtime(struct btrfs_inode_item *inode_item)
 785 {
 786         unsigned long ptr = (unsigned long)inode_item;
 787         ptr += offsetof(struct btrfs_inode_item, mtime);
 788         return (struct btrfs_timespec *)ptr;
 789 }
 790
 791 static inline struct btrfs_timespec *
 792 btrfs_inode_ctime(struct btrfs_inode_item *inode_item)
 793 {
 794         unsigned long ptr = (unsigned long)inode_item;
 795         ptr += offsetof(struct btrfs_inode_item, ctime);
 796         return (struct btrfs_timespec *)ptr;
 797 }
 798
 799 static inline struct btrfs_timespec *
 800 btrfs_inode_otime(struct btrfs_inode_item *inode_item)
 801 {
 802         unsigned long ptr = (unsigned long)inode_item;
 803         ptr += offsetof(struct btrfs_inode_item, otime);
 804         return (struct btrfs_timespec *)ptr;
 805 }
 806
 807 BTRFS_SETGET_FUNCS(timespec_sec, struct btrfs_timespec, sec, 64);
 808 BTRFS_SETGET_FUNCS(timespec_nsec, struct btrfs_timespec, nsec, 32);
 809 BTRFS_SETGET_STACK_FUNCS(stack_timespec_sec, struct btrfs_timespec,
 810                          sec, 64);
 811 BTRFS_SETGET_STACK_FUNCS(stack_timespec_nsec, struct btrfs_timespec,
 812                          nsec, 32);
 813
 814 /* struct btrfs_dev_extent */
 815 BTRFS_SETGET_FUNCS(dev_extent_owner, struct btrfs_dev_extent, owner, 64);
 816 BTRFS_SETGET_FUNCS(dev_extent_length, struct btrfs_dev_extent, length, 64);
 817
 818 /* struct btrfs_extent_item */
 819 BTRFS_SETGET_FUNCS(extent_refs, struct btrfs_extent_item, refs, 32);
 820
 821 /* struct btrfs_extent_ref */
 822 BTRFS_SETGET_FUNCS(ref_root, struct btrfs_extent_ref, root, 64);
 823 BTRFS_SETGET_FUNCS(ref_generation, struct btrfs_extent_ref, generation, 64);
 824 BTRFS_SETGET_FUNCS(ref_objectid, struct btrfs_extent_ref, objectid, 64);
 825 BTRFS_SETGET_FUNCS(ref_offset, struct btrfs_extent_ref, offset, 64);
 826
 827 BTRFS_SETGET_STACK_FUNCS(stack_ref_root, struct btrfs_extent_ref, root, 64);
 828 BTRFS_SETGET_STACK_FUNCS(stack_ref_generation, struct btrfs_extent_ref,
 829                          generation, 64);
 830 BTRFS_SETGET_STACK_FUNCS(stack_ref_objectid, struct btrfs_extent_ref,
 831                          objectid, 64);
 832 BTRFS_SETGET_STACK_FUNCS(stack_ref_offset, struct btrfs_extent_ref, offset, 64);
 833
 834 BTRFS_SETGET_STACK_FUNCS(stack_extent_refs, struct btrfs_extent_item,
 835                          refs, 32);
 836
 837 /* struct btrfs_node */
 838 BTRFS_SETGET_FUNCS(key_blockptr, struct btrfs_key_ptr, blockptr, 64);
 839 BTRFS_SETGET_FUNCS(key_generation, struct btrfs_key_ptr, generation, 64);
 840
 841 static inline u64 btrfs_node_blockptr(struct extent_buffer *eb, int nr)
 842 {
 843         unsigned long ptr;
 844         ptr = offsetof(struct btrfs_node, ptrs) +
 845                 sizeof(struct btrfs_key_ptr) * nr;
 846         return btrfs_key_blockptr(eb, (struct btrfs_key_ptr *)ptr);
 847 }
 848
 849 static inline void btrfs_set_node_blockptr(struct extent_buffer *eb,
 850                                            int nr, u64 val)
 851 {
 852         unsigned long ptr;
 853         ptr = offsetof(struct btrfs_node, ptrs) +
 854                 sizeof(struct btrfs_key_ptr) * nr;
 855         btrfs_set_key_blockptr(eb, (struct btrfs_key_ptr *)ptr, val);
 856 }
 857
 858 static inline u64 btrfs_node_ptr_generation(struct extent_buffer *eb, int nr)
 859 {
 860         unsigned long ptr;
 861         ptr = offsetof(struct btrfs_node, ptrs) +
 862                 sizeof(struct btrfs_key_ptr) * nr;
 863         return btrfs_key_generation(eb, (struct btrfs_key_ptr *)ptr);
 864 }
 865
 866 static inline void btrfs_set_node_ptr_generation(struct extent_buffer *eb,
 867                                                  int nr, u64 val)
 868 {
 869         unsigned long ptr;
 870         ptr = offsetof(struct btrfs_node, ptrs) +
 871                 sizeof(struct btrfs_key_ptr) * nr;
 872         btrfs_set_key_generation(eb, (struct btrfs_key_ptr *)ptr, val);
 873 }
 874
 875 static inline unsigned long btrfs_node_key_ptr_offset(int nr)
 876 {
 877         return offsetof(struct btrfs_node, ptrs) +
 878                 sizeof(struct btrfs_key_ptr) * nr;
 879 }
 880
 881 static inline void btrfs_node_key(struct extent_buffer *eb,
 882                                   struct btrfs_disk_key *disk_key, int nr)
 883 {
 884         unsigned long ptr;
 885         ptr = btrfs_node_key_ptr_offset(nr);
 886         read_eb_member(eb, (struct btrfs_key_ptr *)ptr,
 887                        struct btrfs_key_ptr, key, disk_key);
 888 }
 889
 890 static inline void btrfs_set_node_key(struct extent_buffer *eb,
 891                                       struct btrfs_disk_key *disk_key, int nr)
 892 {
 893         unsigned long ptr;
 894         ptr = btrfs_node_key_ptr_offset(nr);
 895         write_eb_member(eb, (struct btrfs_key_ptr *)ptr,
 896                        struct btrfs_key_ptr, key, disk_key);
 897 }
 898
 899 /* struct btrfs_item */
 900 BTRFS_SETGET_FUNCS(item_offset, struct btrfs_item, offset, 32);
 901 BTRFS_SETGET_FUNCS(item_size, struct btrfs_item, size, 32);
 902
 903 static inline unsigned long btrfs_item_nr_offset(int nr)
 904 {
 905         return offsetof(struct btrfs_leaf, items) +
 906                 sizeof(struct btrfs_item) * nr;
 907 }
 908
 909 static inline struct btrfs_item *btrfs_item_nr(struct extent_buffer *eb,
 910                                                int nr)
 911 {
 912         return (struct btrfs_item *)btrfs_item_nr_offset(nr);
 913 }
 914
 915 static inline u32 btrfs_item_end(struct extent_buffer *eb,
 916                                  struct btrfs_item *item)
 917 {
 918         return btrfs_item_offset(eb, item) + btrfs_item_size(eb, item);
 919 }
 920
 921 static inline u32 btrfs_item_end_nr(struct extent_buffer *eb, int nr)
 922 {
 923         return btrfs_item_end(eb, btrfs_item_nr(eb, nr));
 924 }
 925
 926 static inline u32 btrfs_item_offset_nr(struct extent_buffer *eb, int nr)
 927 {
 928         return btrfs_item_offset(eb, btrfs_item_nr(eb, nr));
 929 }
 930
 931 static inline u32 btrfs_item_size_nr(struct extent_buffer *eb, int nr)
 932 {
 933         return btrfs_item_size(eb, btrfs_item_nr(eb, nr));
 934 }
 935
 936 static inline void btrfs_item_key(struct extent_buffer *eb,
 937                            struct btrfs_disk_key *disk_key, int nr)
 938 {
 939         struct btrfs_item *item = btrfs_item_nr(eb, nr);
 940         read_eb_member(eb, item, struct btrfs_item, key, disk_key);
 941 }
 942
 943 static inline void btrfs_set_item_key(struct extent_buffer *eb,
 944                                struct btrfs_disk_key *disk_key, int nr)
 945 {
 946         struct btrfs_item *item = btrfs_item_nr(eb, nr);
 947         write_eb_member(eb, item, struct btrfs_item, key, disk_key);
 948 }
 949
 950 /* struct btrfs_dir_item */
 951 BTRFS_SETGET_FUNCS(dir_data_len, struct btrfs_dir_item, data_len, 16);
 952 BTRFS_SETGET_FUNCS(dir_type, struct btrfs_dir_item, type, 8);
 953 BTRFS_SETGET_FUNCS(dir_name_len, struct btrfs_dir_item, name_len, 16);
 954
 955 static inline void btrfs_dir_item_key(struct extent_buffer *eb,
 956                                       struct btrfs_dir_item *item,
 957                                       struct btrfs_disk_key *key)
 958 {
 959         read_eb_member(eb, item, struct btrfs_dir_item, location, key);
 960 }
 961
 962 static inline void btrfs_set_dir_item_key(struct extent_buffer *eb,
 963                                           struct btrfs_dir_item *item,
 964                                           struct btrfs_disk_key *key)
 965 {
 966         write_eb_member(eb, item, struct btrfs_dir_item, location, key);
 967 }
 968
 969 /* struct btrfs_disk_key */
 970 BTRFS_SETGET_STACK_FUNCS(disk_key_objectid, struct btrfs_disk_key,
 971                          objectid, 64);
 972 BTRFS_SETGET_STACK_FUNCS(disk_key_offset, struct btrfs_disk_key, offset, 64);
 973 BTRFS_SETGET_STACK_FUNCS(disk_key_type, struct btrfs_disk_key, type, 8);
 974
 975 static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu,
 976                                          struct btrfs_disk_key *disk)
 977 {
 978         cpu->offset = le64_to_cpu(disk->offset);
 979         cpu->type = disk->type;
 980         cpu->objectid = le64_to_cpu(disk->objectid);
 981 }
 982
 983 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk,
 984                                          struct btrfs_key *cpu)
 985 {
 986         disk->offset = cpu_to_le64(cpu->offset);
 987         disk->type = cpu->type;
 988         disk->objectid = cpu_to_le64(cpu->objectid);
 989 }
 990
 991 static inline void btrfs_node_key_to_cpu(struct extent_buffer *eb,
 992                                   struct btrfs_key *key, int nr)
 993 {
 994         struct btrfs_disk_key disk_key;
 995         btrfs_node_key(eb, &disk_key, nr);
 996         btrfs_disk_key_to_cpu(key, &disk_key);
 997 }
 998
 999 static inline void btrfs_item_key_to_cpu(struct extent_buffer *eb,
1000                                   struct btrfs_key *key, int nr)
1001 {
1002         struct btrfs_disk_key disk_key;
1003         btrfs_item_key(eb, &disk_key, nr);
1004         btrfs_disk_key_to_cpu(key, &disk_key);
1005 }
1006
1007 static inline void btrfs_dir_item_key_to_cpu(struct extent_buffer *eb,
1008                                       struct btrfs_dir_item *item,
1009                                       struct btrfs_key *key)
1010 {
1011         struct btrfs_disk_key disk_key;
1012         btrfs_dir_item_key(eb, item, &disk_key);
1013         btrfs_disk_key_to_cpu(key, &disk_key);
1014 }
1015
1016
1017 static inline u8 btrfs_key_type(struct btrfs_key *key)
1018 {
1019         return key->type;
1020 }
1021
1022 static inline void btrfs_set_key_type(struct btrfs_key *key, u8 val)
1023 {
1024         key->type = val;
1025 }
1026
1027 /* struct btrfs_header */
1028 BTRFS_SETGET_HEADER_FUNCS(header_bytenr, struct btrfs_header, bytenr, 64);
1029 BTRFS_SETGET_HEADER_FUNCS(header_generation, struct btrfs_header,
1030                           generation, 64);
1031 BTRFS_SETGET_HEADER_FUNCS(header_owner, struct btrfs_header, owner, 64);
1032 BTRFS_SETGET_HEADER_FUNCS(header_nritems, struct btrfs_header, nritems, 32);
1033 BTRFS_SETGET_HEADER_FUNCS(header_flags, struct btrfs_header, flags, 64);
1034 BTRFS_SETGET_HEADER_FUNCS(header_level, struct btrfs_header, level, 8);
1035
1036 static inline int btrfs_header_flag(struct extent_buffer *eb, u64 flag)
1037 {
1038         return (btrfs_header_flags(eb) & flag) == flag;
1039 }
1040
1041 static inline int btrfs_set_header_flag(struct extent_buffer *eb, u64 flag)
1042 {
1043         u64 flags = btrfs_header_flags(eb);
1044         btrfs_set_header_flags(eb, flags | flag);
1045         return (flags & flag) == flag;
1046 }
1047
1048 static inline int btrfs_clear_header_flag(struct extent_buffer *eb, u64 flag)
1049 {
1050         u64 flags = btrfs_header_flags(eb);
1051         btrfs_set_header_flags(eb, flags & ~flag);
1052         return (flags & flag) == flag;
1053 }
1054
1055 static inline u8 *btrfs_header_fsid(struct extent_buffer *eb)
1056 {
1057         unsigned long ptr = offsetof(struct btrfs_header, fsid);
1058         return (u8 *)ptr;
1059 }
1060
1061 static inline u8 *btrfs_super_fsid(struct extent_buffer *eb)
1062 {
1063         unsigned long ptr = offsetof(struct btrfs_super_block, fsid);
1064         return (u8 *)ptr;
1065 }
1066
1067 static inline u8 *btrfs_header_csum(struct extent_buffer *eb)
1068 {
1069         unsigned long ptr = offsetof(struct btrfs_header, csum);
1070         return (u8 *)ptr;
1071 }
1072
1073 static inline struct btrfs_node *btrfs_buffer_node(struct extent_buffer *eb)
1074 {
1075         return NULL;
1076 }
1077
1078 static inline struct btrfs_leaf *btrfs_buffer_leaf(struct extent_buffer *eb)
1079 {
1080         return NULL;
1081 }
1082
1083 static inline struct btrfs_header *btrfs_buffer_header(struct extent_buffer *eb)
1084 {
1085         return NULL;
1086 }
1087
1088 static inline int btrfs_is_leaf(struct extent_buffer *eb)
1089 {
1090         return (btrfs_header_level(eb) == 0);
1091 }
1092
1093 /* struct btrfs_root_item */
1094 BTRFS_SETGET_FUNCS(disk_root_refs, struct btrfs_root_item, refs, 32);
1095 BTRFS_SETGET_FUNCS(disk_root_bytenr, struct btrfs_root_item, bytenr, 64);
1096 BTRFS_SETGET_FUNCS(disk_root_level, struct btrfs_root_item, level, 8);
1097
1098 BTRFS_SETGET_STACK_FUNCS(root_bytenr, struct btrfs_root_item, bytenr, 64);
1099 BTRFS_SETGET_STACK_FUNCS(root_level, struct btrfs_root_item, level, 8);
1100 BTRFS_SETGET_STACK_FUNCS(root_dirid, struct btrfs_root_item, root_dirid, 64);
1101 BTRFS_SETGET_STACK_FUNCS(root_refs, struct btrfs_root_item, refs, 32);
1102 BTRFS_SETGET_STACK_FUNCS(root_flags, struct btrfs_root_item, flags, 32);
1103 BTRFS_SETGET_STACK_FUNCS(root_used, struct btrfs_root_item, bytes_used, 64);
1104 BTRFS_SETGET_STACK_FUNCS(root_limit, struct btrfs_root_item, byte_limit, 64);
1105
1106 /* struct btrfs_super_block */
1107 BTRFS_SETGET_STACK_FUNCS(super_bytenr, struct btrfs_super_block, bytenr, 64);
1108 BTRFS_SETGET_STACK_FUNCS(super_generation, struct btrfs_super_block,
1109                          generation, 64);
1110 BTRFS_SETGET_STACK_FUNCS(super_root, struct btrfs_super_block, root, 64);
1111 BTRFS_SETGET_STACK_FUNCS(super_sys_array_size,
1112                          struct btrfs_super_block, sys_chunk_array_size, 32);
1113 BTRFS_SETGET_STACK_FUNCS(super_root_level, struct btrfs_super_block,
1114                          root_level, 8);
1115 BTRFS_SETGET_STACK_FUNCS(super_chunk_root, struct btrfs_super_block,
1116                          chunk_root, 64);
1117 BTRFS_SETGET_STACK_FUNCS(super_chunk_root_level, struct btrfs_super_block,
1118                          chunk_root_level, 64);
1119 BTRFS_SETGET_STACK_FUNCS(super_total_bytes, struct btrfs_super_block,
1120                          total_bytes, 64);
1121 BTRFS_SETGET_STACK_FUNCS(super_bytes_used, struct btrfs_super_block,
1122                          bytes_used, 64);
1123 BTRFS_SETGET_STACK_FUNCS(super_sectorsize, struct btrfs_super_block,
1124                          sectorsize, 32);
1125 BTRFS_SETGET_STACK_FUNCS(super_nodesize, struct btrfs_super_block,
1126                          nodesize, 32);
1127 BTRFS_SETGET_STACK_FUNCS(super_leafsize, struct btrfs_super_block,
1128                          leafsize, 32);
1129 BTRFS_SETGET_STACK_FUNCS(super_stripesize, struct btrfs_super_block,
1130                          stripesize, 32);
1131 BTRFS_SETGET_STACK_FUNCS(super_root_dir, struct btrfs_super_block,
1132                          root_dir_objectid, 64);
1133 BTRFS_SETGET_STACK_FUNCS(super_num_devices, struct btrfs_super_block,
1134                          num_devices, 64);
1135
1136 static inline unsigned long btrfs_leaf_data(struct extent_buffer *l)
1137 {
1138         return offsetof(struct btrfs_leaf, items);
1139 }
1140
1141 /* struct btrfs_file_extent_item */
1142 BTRFS_SETGET_FUNCS(file_extent_type, struct btrfs_file_extent_item, type, 8);
1143
1144 static inline unsigned long btrfs_file_extent_inline_start(struct
1145                                                    btrfs_file_extent_item *e)
1146 {
1147         unsigned long offset = (unsigned long)e;
1148         offset += offsetof(struct btrfs_file_extent_item, disk_bytenr);
1149         return offset;
1150 }
1151
1152 static inline u32 btrfs_file_extent_calc_inline_size(u32 datasize)
1153 {
1154         return offsetof(struct btrfs_file_extent_item, disk_bytenr) + datasize;
1155 }
1156
1157 static inline u32 btrfs_file_extent_inline_len(struct extent_buffer *eb,
1158                                                struct btrfs_item *e)
1159 {
1160         unsigned long offset;
1161         offset = offsetof(struct btrfs_file_extent_item, disk_bytenr);
1162         return btrfs_item_size(eb, e) - offset;
1163 }
1164
1165 BTRFS_SETGET_FUNCS(file_extent_disk_bytenr, struct btrfs_file_extent_item,
1166                    disk_bytenr, 64);
1167 BTRFS_SETGET_FUNCS(file_extent_generation, struct btrfs_file_extent_item,
1168                    generation, 64);
1169 BTRFS_SETGET_FUNCS(file_extent_disk_num_bytes, struct btrfs_file_extent_item,
1170                    disk_num_bytes, 64);
1171 BTRFS_SETGET_FUNCS(file_extent_offset, struct btrfs_file_extent_item,
1172                   offset, 64);
1173 BTRFS_SETGET_FUNCS(file_extent_num_bytes, struct btrfs_file_extent_item,
1174                    num_bytes, 64);
1175
1176 static inline u32 btrfs_level_size(struct btrfs_root *root, int level) {
1177         if (level == 0)
1178                 return root->leafsize;
1179         return root->nodesize;
1180 }
1181
1182 /* helper function to cast into the data area of the leaf. */
1183 #define btrfs_item_ptr(leaf, slot, type) \
1184         ((type *)(btrfs_leaf_data(leaf) + \
1185         btrfs_item_offset_nr(leaf, slot)))
1186
1187 #define btrfs_item_ptr_offset(leaf, slot) \
1188         ((unsigned long)(btrfs_leaf_data(leaf) + \
1189         btrfs_item_offset_nr(leaf, slot)))
1190
1191 /* extent-tree.c */
1192 u32 btrfs_count_snapshots_in_path(struct btrfs_root *root,
1193                                   struct btrfs_path *count_path,
1194                                   u64 first_extent);
1195 int btrfs_extent_post_op(struct btrfs_trans_handle *trans,
1196                          struct btrfs_root *root);
1197 int btrfs_copy_pinned(struct btrfs_root *root, struct extent_io_tree *copy);
1198 struct btrfs_block_group_cache *btrfs_lookup_block_group(struct
1199                                                          btrfs_fs_info *info,
1200                                                          u64 bytenr);
1201 struct btrfs_block_group_cache *btrfs_find_block_group(struct btrfs_root *root,
1202                                                  struct btrfs_block_group_cache
1203                                                  *hint, u64 search_start,
1204                                                  int data, int owner);
1205 int btrfs_inc_root_ref(struct btrfs_trans_handle *trans,
1206                        struct btrfs_root *root, u64 owner_objectid);
1207 struct extent_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
1208                                             struct btrfs_root *root, u32 size,
1209                                             u64 root_objectid,
1210                                             u64 hint, u64 empty_size);
1211 struct extent_buffer *__btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
1212                                              struct btrfs_root *root,
1213                                              u32 blocksize,
1214                                              u64 root_objectid,
1215                                              u64 ref_generation,
1216                                              u64 first_objectid,
1217                                              int level,
1218                                              u64 hint,
1219                                              u64 empty_size);
1220 int btrfs_grow_extent_tree(struct btrfs_trans_handle *trans,
1221                            struct btrfs_root *root, u64 new_size);
1222 int btrfs_shrink_extent_tree(struct btrfs_root *root, u64 new_size);
1223 int btrfs_insert_extent_backref(struct btrfs_trans_handle *trans,
1224                                  struct btrfs_root *root,
1225                                  struct btrfs_path *path, u64 bytenr,
1226                                  u64 root_objectid, u64 ref_generation,
1227                                  u64 owner, u64 owner_offset);
1228 int btrfs_alloc_extent(struct btrfs_trans_handle *trans,
1229                        struct btrfs_root *root,
1230                        u64 num_bytes, u64 root_objectid, u64 ref_generation,
1231                        u64 owner, u64 owner_offset,
1232                        u64 empty_size, u64 hint_byte,
1233                        u64 search_end, struct btrfs_key *ins, int data);
1234 int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1235                   struct extent_buffer *buf);
1236 int btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
1237                       *root, u64 bytenr, u64 num_bytes,
1238                       u64 root_objectid, u64 ref_generation,
1239                       u64 owner_objectid, u64 owner_offset, int pin);
1240 int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans,
1241                                struct btrfs_root *root,
1242                                struct extent_io_tree *unpin);
1243 int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
1244                                 struct btrfs_root *root,
1245                                 u64 bytenr, u64 num_bytes,
1246                                 u64 root_objectid, u64 ref_generation,
1247                                 u64 owner, u64 owner_offset);
1248 int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans,
1249                                     struct btrfs_root *root);
1250 int btrfs_free_block_groups(struct btrfs_fs_info *info);
1251 int btrfs_read_block_groups(struct btrfs_root *root);
1252 int btrfs_make_block_group(struct btrfs_trans_handle *trans,
1253                            struct btrfs_root *root, u64 bytes_used,
1254                            u64 type, u64 chunk_tree, u64 chunk_objectid,
1255                            u64 size);
1256 u64 btrfs_hash_extent_ref(u64 root_objectid, u64 ref_generation,
1257                           u64 owner, u64 owner_offset);
1258 int btrfs_update_block_group(struct btrfs_trans_handle *trans,
1259                              struct btrfs_root *root, u64 bytenr, u64 num,
1260                              int alloc, int mark_free);
1261 /* ctree.c */
1262 int btrfs_previous_item(struct btrfs_root *root,
1263                         struct btrfs_path *path, u64 min_objectid,
1264                         int type);
1265 int btrfs_comp_keys(struct btrfs_disk_key *disk, struct btrfs_key *k2);
1266 int btrfs_cow_block(struct btrfs_trans_handle *trans,
1267                     struct btrfs_root *root, struct extent_buffer *buf,
1268                     struct extent_buffer *parent, int parent_slot,
1269                     struct extent_buffer **cow_ret);
1270 int btrfs_copy_root(struct btrfs_trans_handle *trans,
1271                       struct btrfs_root *root,
1272                       struct extent_buffer *buf,
1273                       struct extent_buffer **cow_ret, u64 new_root_objectid);
1274 int btrfs_extend_item(struct btrfs_trans_handle *trans, struct btrfs_root
1275                       *root, struct btrfs_path *path, u32 data_size);
1276 int btrfs_truncate_item(struct btrfs_trans_handle *trans,
1277                         struct btrfs_root *root,
1278                         struct btrfs_path *path,
1279                         u32 new_size, int from_end);
1280 int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root
1281                       *root, struct btrfs_key *key, struct btrfs_path *p, int
1282                       ins_len, int cow);
1283 int btrfs_realloc_node(struct btrfs_trans_handle *trans,
1284                        struct btrfs_root *root, struct extent_buffer *parent,
1285                        int start_slot, int cache_only, u64 *last_ret,
1286                        struct btrfs_key *progress);
1287 void btrfs_release_path(struct btrfs_root *root, struct btrfs_path *p);
1288 struct btrfs_path *btrfs_alloc_path(void);
1289 void btrfs_free_path(struct btrfs_path *p);
1290 void btrfs_init_path(struct btrfs_path *p);
1291 int btrfs_del_items(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1292                    struct btrfs_path *path, int slot, int nr);
1293
1294 static inline int btrfs_del_item(struct btrfs_trans_handle *trans,
1295                                  struct btrfs_root *root,
1296                                  struct btrfs_path *path)
1297 {
1298         return btrfs_del_items(trans, root, path, path->slots[0], 1);
1299 }
1300
1301 int btrfs_insert_item(struct btrfs_trans_handle *trans, struct btrfs_root
1302                       *root, struct btrfs_key *key, void *data, u32 data_size);
1303 int btrfs_insert_empty_items(struct btrfs_trans_handle *trans,
1304                              struct btrfs_root *root,
1305                              struct btrfs_path *path,
1306                              struct btrfs_key *cpu_key, u32 *data_size, int nr);
1307
1308 static inline int btrfs_insert_empty_item(struct btrfs_trans_handle *trans,
1309                                           struct btrfs_root *root,
1310                                           struct btrfs_path *path,
1311                                           struct btrfs_key *key,
1312                                           u32 data_size)
1313 {
1314         return btrfs_insert_empty_items(trans, root, path, key, &data_size, 1);
1315 }
1316
1317 int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path);
1318 int btrfs_prev_leaf(struct btrfs_root *root, struct btrfs_path *path);
1319 int btrfs_leaf_free_space(struct btrfs_root *root, struct extent_buffer *leaf);
1320 int btrfs_drop_snapshot(struct btrfs_trans_handle *trans, struct btrfs_root
1321                         *root);
1322
1323
1324 /* root-item.c */
1325 int btrfs_del_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1326                    struct btrfs_key *key);
1327 int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root
1328                       *root, struct btrfs_key *key, struct btrfs_root_item
1329                       *item);
1330 int btrfs_update_root(struct btrfs_trans_handle *trans, struct btrfs_root
1331                       *root, struct btrfs_key *key, struct btrfs_root_item
1332                       *item);
1333 int btrfs_find_last_root(struct btrfs_root *root, u64 objectid, struct
1334                          btrfs_root_item *item, struct btrfs_key *key);
1335 int btrfs_find_dead_roots(struct btrfs_root *root, u64 objectid,
1336                           struct btrfs_root *latest_root);
1337 /* dir-item.c */
1338 int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
1339                           *root, const char *name, int name_len, u64 dir,
1340                           struct btrfs_key *location, u8 type);
1341 struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans,
1342                                              struct btrfs_root *root,
1343                                              struct btrfs_path *path, u64 dir,
1344                                              const char *name, int name_len,
1345                                              int mod);
1346 struct btrfs_dir_item *
1347 btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans,
1348                             struct btrfs_root *root,
1349                             struct btrfs_path *path, u64 dir,
1350                             u64 objectid, const char *name, int name_len,
1351                             int mod);
1352 struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_root *root,
1353                               struct btrfs_path *path,
1354                               const char *name, int name_len);
1355 int btrfs_delete_one_dir_name(struct btrfs_trans_handle *trans,
1356                               struct btrfs_root *root,
1357                               struct btrfs_path *path,
1358                               struct btrfs_dir_item *di);
1359 int btrfs_insert_xattr_item(struct btrfs_trans_handle *trans,
1360                             struct btrfs_root *root, const char *name,
1361                             u16 name_len, const void *data, u16 data_len,
1362                             u64 dir);
1363 struct btrfs_dir_item *btrfs_lookup_xattr(struct btrfs_trans_handle *trans,
1364                                           struct btrfs_root *root,
1365                                           struct btrfs_path *path, u64 dir,
1366                                           const char *name, u16 name_len,
1367                                           int mod);
1368 /* inode-map.c */
1369 int btrfs_find_free_objectid(struct btrfs_trans_handle *trans,
1370                              struct btrfs_root *fs_root,
1371                              u64 dirid, u64 *objectid);
1372 int btrfs_find_highest_inode(struct btrfs_root *fs_root, u64 *objectid);
1373
1374 /* inode-item.c */
1375 int btrfs_insert_inode_ref(struct btrfs_trans_handle *trans,
1376                            struct btrfs_root *root,
1377                            const char *name, int name_len,
1378                            u64 inode_objectid, u64 ref_objectid);
1379 int btrfs_del_inode_ref(struct btrfs_trans_handle *trans,
1380                            struct btrfs_root *root,
1381                            const char *name, int name_len,
1382                            u64 inode_objectid, u64 ref_objectid);
1383 int btrfs_insert_empty_inode(struct btrfs_trans_handle *trans,
1384                              struct btrfs_root *root,
1385                              struct btrfs_path *path, u64 objectid);
1386 int btrfs_insert_inode(struct btrfs_trans_handle *trans, struct btrfs_root
1387                        *root, u64 objectid, struct btrfs_inode_item
1388                        *inode_item);
1389 int btrfs_lookup_inode(struct btrfs_trans_handle *trans, struct btrfs_root
1390                        *root, struct btrfs_path *path,
1391                        struct btrfs_key *location, int mod);
1392
1393 /* file-item.c */
1394 int btrfs_insert_file_extent(struct btrfs_trans_handle *trans,
1395                              struct btrfs_root *root,
1396                              u64 objectid, u64 pos, u64 offset,
1397                              u64 disk_num_bytes,
1398                              u64 num_bytes);
1399 int btrfs_insert_inline_extent(struct btrfs_trans_handle *trans,
1400                                 struct btrfs_root *root, u64 objectid,
1401                                 u64 offset, char *buffer, size_t size);
1402 int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
1403                              struct btrfs_root *root,
1404                              struct btrfs_path *path, u64 objectid,
1405                              u64 bytenr, int mod);
1406 int btrfs_csum_file_block(struct btrfs_trans_handle *trans,
1407                           struct btrfs_root *root,
1408                           struct btrfs_inode_item *inode,
1409                           u64 objectid, u64 offset,
1410                           char *data, size_t len);
1411 struct btrfs_csum_item *btrfs_lookup_csum(struct btrfs_trans_handle *trans,
1412                                           struct btrfs_root *root,
1413                                           struct btrfs_path *path,
1414                                           u64 objectid, u64 offset,
1415                                           int cow);
1416 int btrfs_csum_truncate(struct btrfs_trans_handle *trans,
1417                         struct btrfs_root *root, struct btrfs_path *path,
1418                         u64 isize);
1419 #endif