ctree.h

   1 #ifndef __BTRFS__
   2 #define __BTRFS__
   3
   4 #include "list.h"
   5 #include "kerncompat.h"
   6
   7 struct btrfs_trans_handle;
   8
   9 #define BTRFS_MAGIC "_BtRfS_M"
  10
  11 #define BTRFS_ROOT_TREE_OBJECTID 1
  12 #define BTRFS_EXTENT_TREE_OBJECTID 2
  13 #define BTRFS_INODE_MAP_OBJECTID 3
  14 #define BTRFS_FS_TREE_OBJECTID 4
  15
  16 /*
  17  * the key defines the order in the tree, and so it also defines (optimal)
  18  * block layout.  objectid corresonds to the inode number.  The flags
  19  * tells us things about the object, and is a kind of stream selector.
  20  * so for a given inode, keys with flags of 1 might refer to the inode
  21  * data, flags of 2 may point to file data in the btree and flags == 3
  22  * may point to extents.
  23  *
  24  * offset is the starting byte offset for this key in the stream.
  25  *
  26  * btrfs_disk_key is in disk byte order.  struct btrfs_key is always
  27  * in cpu native order.  Otherwise they are identical and their sizes
  28  * should be the same (ie both packed)
  29  */
  30 struct btrfs_disk_key {
  31         __le64 objectid;
  32         __le32 flags;
  33         __le64 offset;
  34 } __attribute__ ((__packed__));
  35
  36 struct btrfs_key {
  37         u64 objectid;
  38         u32 flags;
  39         u64 offset;
  40 } __attribute__ ((__packed__));
  41
  42 /*
  43  * every tree block (leaf or node) starts with this header.
  44  */
  45 struct btrfs_header {
  46         u8 fsid[16]; /* FS specific uuid */
  47         __le64 blocknr; /* which block this node is supposed to live in */
  48         __le64 generation;
  49         __le64 parentid; /* objectid of the tree root */
  50         __le32 csum;
  51         __le32 ham;
  52         __le16 nritems;
  53         __le16 flags;
  54         /* generation flags to be added */
  55 } __attribute__ ((__packed__));
  56
  57 #define BTRFS_MAX_LEVEL 8
  58 #define BTRFS_NODEPTRS_PER_BLOCK(r) (((r)->blocksize - \
  59                                 sizeof(struct btrfs_header)) / \
  60                                (sizeof(struct btrfs_disk_key) + sizeof(u64)))
  61 #define __BTRFS_LEAF_DATA_SIZE(bs) ((bs) - sizeof(struct btrfs_header))
  62 #define BTRFS_LEAF_DATA_SIZE(r) (__BTRFS_LEAF_DATA_SIZE(r->blocksize))
  63
  64 struct btrfs_buffer;
  65 /*
  66  * the super block basically lists the main trees of the FS
  67  * it currently lacks any block count etc etc
  68  */
  69 struct btrfs_super_block {
  70         u8 fsid[16];    /* FS specific uuid */
  71         __le64 blocknr; /* this block number */
  72         __le32 csum;
  73         __le64 magic;
  74         __le32 blocksize;
  75         __le64 generation;
  76         __le64 root;
  77         __le64 total_blocks;
  78         __le64 blocks_used;
  79         __le64 root_dir_objectid;
  80 } __attribute__ ((__packed__));
  81
  82 /*
  83  * A leaf is full of items. offset and size tell us where to find
  84  * the item in the leaf (relative to the start of the data area)
  85  */
  86 struct btrfs_item {
  87         struct btrfs_disk_key key;
  88         __le32 offset;
  89         __le16 size;
  90 } __attribute__ ((__packed__));
  91
  92 /*
  93  * leaves have an item area and a data area:
  94  * [item0, item1....itemN] [free space] [dataN...data1, data0]
  95  *
  96  * The data is separate from the items to get the keys closer together
  97  * during searches.
  98  */
  99 struct btrfs_leaf {
 100         struct btrfs_header header;
 101         struct btrfs_item items[];
 102 } __attribute__ ((__packed__));
 103
 104 /*
 105  * all non-leaf blocks are nodes, they hold only keys and pointers to
 106  * other blocks
 107  */
 108 struct btrfs_key_ptr {
 109         struct btrfs_disk_key key;
 110         __le64 blockptr;
 111 } __attribute__ ((__packed__));
 112
 113 struct btrfs_node {
 114         struct btrfs_header header;
 115         struct btrfs_key_ptr ptrs[];
 116 } __attribute__ ((__packed__));
 117
 118 /*
 119  * btrfs_paths remember the path taken from the root down to the leaf.
 120  * level 0 is always the leaf, and nodes[1...BTRFS_MAX_LEVEL] will point
 121  * to any other levels that are present.
 122  *
 123  * The slots array records the index of the item or block pointer
 124  * used while walking the tree.
 125  */
 126 struct btrfs_path {
 127         struct btrfs_buffer *nodes[BTRFS_MAX_LEVEL];
 128         int slots[BTRFS_MAX_LEVEL];
 129 };
 130
 131 /*
 132  * items in the extent btree are used to record the objectid of the
 133  * owner of the block and the number of references
 134  */
 135 struct btrfs_extent_item {
 136         __le32 refs;
 137         __le64 owner;
 138 } __attribute__ ((__packed__));
 139
 140 struct btrfs_inode_timespec {
 141         __le32 sec;
 142         __le32 nsec;
 143 } __attribute__ ((__packed__));
 144
 145 /*
 146  * there is no padding here on purpose.  If you want to extent the inode,
 147  * make a new item type
 148  */
 149 struct btrfs_inode_item {
 150         __le64 generation;
 151         __le64 size;
 152         __le64 nblocks;
 153         __le32 nlink;
 154         __le32 uid;
 155         __le32 gid;
 156         __le32 mode;
 157         __le32 rdev;
 158         __le16 flags;
 159         __le16 compat_flags;
 160         struct btrfs_inode_timespec atime;
 161         struct btrfs_inode_timespec ctime;
 162         struct btrfs_inode_timespec mtime;
 163         struct btrfs_inode_timespec otime;
 164 } __attribute__ ((__packed__));
 165
 166 /* inline data is just a blob of bytes */
 167 struct btrfs_inline_data_item {
 168         u8 data;
 169 } __attribute__ ((__packed__));
 170
 171 struct btrfs_dir_item {
 172         __le64 objectid;
 173         __le16 flags;
 174         __le16 name_len;
 175         u8 type;
 176 } __attribute__ ((__packed__));
 177
 178 struct btrfs_root_item {
 179         __le64 blocknr;
 180         __le32 flags;
 181         __le64 block_limit;
 182         __le64 blocks_used;
 183         __le32 refs;
 184 } __attribute__ ((__packed__));
 185
 186 struct btrfs_file_extent_item {
 187         /*
 188          * disk space consumed by the extent, checksum blocks are included
 189          * in these numbers
 190          */
 191         __le64 disk_blocknr;
 192         __le64 disk_num_blocks;
 193         /*
 194          * the logical offset in file blocks (no csums)
 195          * this extent record is for.  This allows a file extent to point
 196          * into the middle of an existing extent on disk, sharing it
 197          * between two snapshots (useful if some bytes in the middle of the
 198          * extent have changed
 199          */
 200         __le64 offset;
 201         /*
 202          * the logical number of file blocks (no csums included)
 203          */
 204         __le64 num_blocks;
 205 } __attribute__ ((__packed__));
 206
 207 struct btrfs_inode_map_item {
 208         struct btrfs_disk_key key;
 209 } __attribute__ ((__packed__));
 210
 211 struct btrfs_fs_info {
 212         struct btrfs_root *fs_root;
 213         struct btrfs_root *extent_root;
 214         struct btrfs_root *tree_root;
 215         struct btrfs_root *inode_root;
 216         struct btrfs_key current_insert;
 217         struct btrfs_key last_insert;
 218         struct radix_tree_root cache_radix;
 219         struct radix_tree_root pinned_radix;
 220         struct list_head trans;
 221         struct list_head cache;
 222         u64 last_inode_alloc;
 223         u64 last_inode_alloc_dirid;
 224         u64 generation;
 225         int cache_size;
 226         int fp;
 227         struct btrfs_trans_handle *running_transaction;
 228         struct btrfs_super_block *disk_super;
 229 };
 230
 231 /*
 232  * in ram representation of the tree.  extent_root is used for all allocations
 233  * and for the extent tree extent_root root.  current_insert is used
 234  * only for the extent tree.
 235  */
 236 struct btrfs_root {
 237         struct btrfs_buffer *node;
 238         struct btrfs_buffer *commit_root;
 239         struct btrfs_root_item root_item;
 240         struct btrfs_key root_key;
 241         struct btrfs_fs_info *fs_info;
 242         u32 blocksize;
 243         int ref_cows;
 244         u32 type;
 245 };
 246
 247 /* the lower bits in the key flags defines the item type */
 248 #define BTRFS_KEY_TYPE_MAX      256
 249 #define BTRFS_KEY_TYPE_MASK     (BTRFS_KEY_TYPE_MAX - 1)
 250
 251 /*
 252  * inode items have the data typically returned from stat and store other
 253  * info about object characteristics.  There is one for every file and dir in
 254  * the FS
 255  */
 256 #define BTRFS_INODE_ITEM_KEY    1
 257
 258 /*
 259  * dir items are the name -> inode pointers in a directory.  There is one
 260  * for every name in a directory.
 261  */
 262 #define BTRFS_DIR_ITEM_KEY      2
 263 /*
 264  * inline data is file data that fits in the btree.
 265  */
 266 #define BTRFS_INLINE_DATA_KEY   3
 267 /*
 268  * extent data is for data that can't fit in the btree.  It points to
 269  * a (hopefully) huge chunk of disk
 270  */
 271 #define BTRFS_EXTENT_DATA_KEY   4
 272 /*
 273  * root items point to tree roots.  There are typically in the root
 274  * tree used by the super block to find all the other trees
 275  */
 276 #define BTRFS_ROOT_ITEM_KEY     5
 277 /*
 278  * extent items are in the extent map tree.  These record which blocks
 279  * are used, and how many references there are to each block
 280  */
 281 #define BTRFS_EXTENT_ITEM_KEY   6
 282
 283 /*
 284  * the inode map records which inode numbers are in use and where
 285  * they actually live on disk
 286  */
 287 #define BTRFS_INODE_MAP_ITEM_KEY 7
 288 /*
 289  * string items are for debugging.  They just store a short string of
 290  * data in the FS
 291  */
 292 #define BTRFS_STRING_ITEM_KEY   8
 293
 294 static inline u64 btrfs_inode_generation(struct btrfs_inode_item *i)
 295 {
 296         return le64_to_cpu(i->generation);
 297 }
 298
 299 static inline void btrfs_set_inode_generation(struct btrfs_inode_item *i,
 300                                               u64 val)
 301 {
 302         i->generation = cpu_to_le64(val);
 303 }
 304
 305 static inline u64 btrfs_inode_size(struct btrfs_inode_item *i)
 306 {
 307         return le64_to_cpu(i->size);
 308 }
 309
 310 static inline void btrfs_set_inode_size(struct btrfs_inode_item *i, u64 val)
 311 {
 312         i->size = cpu_to_le64(val);
 313 }
 314
 315 static inline u64 btrfs_inode_nblocks(struct btrfs_inode_item *i)
 316 {
 317         return le64_to_cpu(i->nblocks);
 318 }
 319
 320 static inline void btrfs_set_inode_nblocks(struct btrfs_inode_item *i, u64 val)
 321 {
 322         i->nblocks = cpu_to_le64(val);
 323 }
 324
 325 static inline u32 btrfs_inode_nlink(struct btrfs_inode_item *i)
 326 {
 327         return le32_to_cpu(i->nlink);
 328 }
 329
 330 static inline void btrfs_set_inode_nlink(struct btrfs_inode_item *i, u32 val)
 331 {
 332         i->nlink = cpu_to_le32(val);
 333 }
 334
 335 static inline u32 btrfs_inode_uid(struct btrfs_inode_item *i)
 336 {
 337         return le32_to_cpu(i->uid);
 338 }
 339
 340 static inline void btrfs_set_inode_uid(struct btrfs_inode_item *i, u32 val)
 341 {
 342         i->uid = cpu_to_le32(val);
 343 }
 344
 345 static inline u32 btrfs_inode_gid(struct btrfs_inode_item *i)
 346 {
 347         return le32_to_cpu(i->gid);
 348 }
 349
 350 static inline void btrfs_set_inode_gid(struct btrfs_inode_item *i, u32 val)
 351 {
 352         i->gid = cpu_to_le32(val);
 353 }
 354
 355 static inline u32 btrfs_inode_mode(struct btrfs_inode_item *i)
 356 {
 357         return le32_to_cpu(i->mode);
 358 }
 359
 360 static inline void btrfs_set_inode_mode(struct btrfs_inode_item *i, u32 val)
 361 {
 362         i->mode = cpu_to_le32(val);
 363 }
 364
 365 static inline u32 btrfs_inode_rdev(struct btrfs_inode_item *i)
 366 {
 367         return le32_to_cpu(i->rdev);
 368 }
 369
 370 static inline void btrfs_set_inode_rdev(struct btrfs_inode_item *i, u32 val)
 371 {
 372         i->rdev = cpu_to_le32(val);
 373 }
 374
 375 static inline u16 btrfs_inode_flags(struct btrfs_inode_item *i)
 376 {
 377         return le16_to_cpu(i->flags);
 378 }
 379
 380 static inline void btrfs_set_inode_flags(struct btrfs_inode_item *i, u16 val)
 381 {
 382         i->flags = cpu_to_le16(val);
 383 }
 384
 385 static inline u16 btrfs_inode_compat_flags(struct btrfs_inode_item *i)
 386 {
 387         return le16_to_cpu(i->compat_flags);
 388 }
 389
 390 static inline void btrfs_set_inode_compat_flags(struct btrfs_inode_item *i,
 391                                                 u16 val)
 392 {
 393         i->compat_flags = cpu_to_le16(val);
 394 }
 395
 396
 397 static inline u64 btrfs_extent_owner(struct btrfs_extent_item *ei)
 398 {
 399         return le64_to_cpu(ei->owner);
 400 }
 401
 402 static inline void btrfs_set_extent_owner(struct btrfs_extent_item *ei, u64 val)
 403 {
 404         ei->owner = cpu_to_le64(val);
 405 }
 406
 407 static inline u32 btrfs_extent_refs(struct btrfs_extent_item *ei)
 408 {
 409         return le32_to_cpu(ei->refs);
 410 }
 411
 412 static inline void btrfs_set_extent_refs(struct btrfs_extent_item *ei, u32 val)
 413 {
 414         ei->refs = cpu_to_le32(val);
 415 }
 416
 417 static inline u64 btrfs_node_blockptr(struct btrfs_node *n, int nr)
 418 {
 419         return le64_to_cpu(n->ptrs[nr].blockptr);
 420 }
 421
 422 static inline void btrfs_set_node_blockptr(struct btrfs_node *n, int nr,
 423                                            u64 val)
 424 {
 425         n->ptrs[nr].blockptr = cpu_to_le64(val);
 426 }
 427
 428 static inline u32 btrfs_item_offset(struct btrfs_item *item)
 429 {
 430         return le32_to_cpu(item->offset);
 431 }
 432
 433 static inline void btrfs_set_item_offset(struct btrfs_item *item, u32 val)
 434 {
 435         item->offset = cpu_to_le32(val);
 436 }
 437
 438 static inline u32 btrfs_item_end(struct btrfs_item *item)
 439 {
 440         return le32_to_cpu(item->offset) + le16_to_cpu(item->size);
 441 }
 442
 443 static inline u16 btrfs_item_size(struct btrfs_item *item)
 444 {
 445         return le16_to_cpu(item->size);
 446 }
 447
 448 static inline void btrfs_set_item_size(struct btrfs_item *item, u16 val)
 449 {
 450         item->size = cpu_to_le16(val);
 451 }
 452
 453 static inline u64 btrfs_dir_objectid(struct btrfs_dir_item *d)
 454 {
 455         return le64_to_cpu(d->objectid);
 456 }
 457
 458 static inline void btrfs_set_dir_objectid(struct btrfs_dir_item *d, u64 val)
 459 {
 460         d->objectid = cpu_to_le64(val);
 461 }
 462
 463 static inline u16 btrfs_dir_flags(struct btrfs_dir_item *d)
 464 {
 465         return le16_to_cpu(d->flags);
 466 }
 467
 468 static inline void btrfs_set_dir_flags(struct btrfs_dir_item *d, u16 val)
 469 {
 470         d->flags = cpu_to_le16(val);
 471 }
 472
 473 static inline u8 btrfs_dir_type(struct btrfs_dir_item *d)
 474 {
 475         return d->type;
 476 }
 477
 478 static inline void btrfs_set_dir_type(struct btrfs_dir_item *d, u8 val)
 479 {
 480         d->type = val;
 481 }
 482
 483 static inline u16 btrfs_dir_name_len(struct btrfs_dir_item *d)
 484 {
 485         return le16_to_cpu(d->name_len);
 486 }
 487
 488 static inline void btrfs_set_dir_name_len(struct btrfs_dir_item *d, u16 val)
 489 {
 490         d->name_len = cpu_to_le16(val);
 491 }
 492
 493 static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu,
 494                                          struct btrfs_disk_key *disk)
 495 {
 496         cpu->offset = le64_to_cpu(disk->offset);
 497         cpu->flags = le32_to_cpu(disk->flags);
 498         cpu->objectid = le64_to_cpu(disk->objectid);
 499 }
 500
 501 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk,
 502                                          struct btrfs_key *cpu)
 503 {
 504         disk->offset = cpu_to_le64(cpu->offset);
 505         disk->flags = cpu_to_le32(cpu->flags);
 506         disk->objectid = cpu_to_le64(cpu->objectid);
 507 }
 508
 509 static inline u64 btrfs_disk_key_objectid(struct btrfs_disk_key *disk)
 510 {
 511         return le64_to_cpu(disk->objectid);
 512 }
 513
 514 static inline void btrfs_set_disk_key_objectid(struct btrfs_disk_key *disk,
 515                                                u64 val)
 516 {
 517         disk->objectid = cpu_to_le64(val);
 518 }
 519
 520 static inline u64 btrfs_disk_key_offset(struct btrfs_disk_key *disk)
 521 {
 522         return le64_to_cpu(disk->offset);
 523 }
 524
 525 static inline void btrfs_set_disk_key_offset(struct btrfs_disk_key *disk,
 526                                              u64 val)
 527 {
 528         disk->offset = cpu_to_le64(val);
 529 }
 530
 531 static inline u32 btrfs_disk_key_flags(struct btrfs_disk_key *disk)
 532 {
 533         return le32_to_cpu(disk->flags);
 534 }
 535
 536 static inline void btrfs_set_disk_key_flags(struct btrfs_disk_key *disk,
 537                                             u32 val)
 538 {
 539         disk->flags = cpu_to_le32(val);
 540 }
 541
 542 static inline u32 btrfs_key_type(struct btrfs_key *key)
 543 {
 544         return key->flags & BTRFS_KEY_TYPE_MASK;
 545 }
 546
 547 static inline u32 btrfs_disk_key_type(struct btrfs_disk_key *key)
 548 {
 549         return le32_to_cpu(key->flags) & BTRFS_KEY_TYPE_MASK;
 550 }
 551
 552 static inline void btrfs_set_key_type(struct btrfs_key *key, u32 type)
 553 {
 554         BUG_ON(type >= BTRFS_KEY_TYPE_MAX);
 555         key->flags = (key->flags & ~((u64)BTRFS_KEY_TYPE_MASK)) | type;
 556 }
 557
 558 static inline void btrfs_set_disk_key_type(struct btrfs_disk_key *key, u32 type)
 559 {
 560         u32 flags = btrfs_disk_key_flags(key);
 561         BUG_ON(type >= BTRFS_KEY_TYPE_MAX);
 562         flags = (flags & ~((u64)BTRFS_KEY_TYPE_MASK)) | type;
 563         btrfs_set_disk_key_flags(key, flags);
 564 }
 565
 566 static inline u64 btrfs_header_blocknr(struct btrfs_header *h)
 567 {
 568         return le64_to_cpu(h->blocknr);
 569 }
 570
 571 static inline void btrfs_set_header_blocknr(struct btrfs_header *h, u64 blocknr)
 572 {
 573         h->blocknr = cpu_to_le64(blocknr);
 574 }
 575
 576 static inline u64 btrfs_header_generation(struct btrfs_header *h)
 577 {
 578         return le64_to_cpu(h->generation);
 579 }
 580
 581 static inline void btrfs_set_header_generation(struct btrfs_header *h,
 582                                                u64 val)
 583 {
 584         h->generation = cpu_to_le64(val);
 585 }
 586
 587 static inline u64 btrfs_header_parentid(struct btrfs_header *h)
 588 {
 589         return le64_to_cpu(h->parentid);
 590 }
 591
 592 static inline void btrfs_set_header_parentid(struct btrfs_header *h,
 593                                              u64 parentid)
 594 {
 595         h->parentid = cpu_to_le64(parentid);
 596 }
 597
 598 static inline u16 btrfs_header_nritems(struct btrfs_header *h)
 599 {
 600         return le16_to_cpu(h->nritems);
 601 }
 602
 603 static inline void btrfs_set_header_nritems(struct btrfs_header *h, u16 val)
 604 {
 605         h->nritems = cpu_to_le16(val);
 606 }
 607
 608 static inline u16 btrfs_header_flags(struct btrfs_header *h)
 609 {
 610         return le16_to_cpu(h->flags);
 611 }
 612
 613 static inline void btrfs_set_header_flags(struct btrfs_header *h, u16 val)
 614 {
 615         h->flags = cpu_to_le16(val);
 616 }
 617
 618 static inline int btrfs_header_level(struct btrfs_header *h)
 619 {
 620         return btrfs_header_flags(h) & (BTRFS_MAX_LEVEL - 1);
 621 }
 622
 623 static inline void btrfs_set_header_level(struct btrfs_header *h, int level)
 624 {
 625         u16 flags;
 626         BUG_ON(level > BTRFS_MAX_LEVEL);
 627         flags = btrfs_header_flags(h) & ~(BTRFS_MAX_LEVEL - 1);
 628         btrfs_set_header_flags(h, flags | level);
 629 }
 630
 631 static inline int btrfs_is_leaf(struct btrfs_node *n)
 632 {
 633         return (btrfs_header_level(&n->header) == 0);
 634 }
 635
 636 static inline u64 btrfs_root_blocknr(struct btrfs_root_item *item)
 637 {
 638         return le64_to_cpu(item->blocknr);
 639 }
 640
 641 static inline void btrfs_set_root_blocknr(struct btrfs_root_item *item, u64 val)
 642 {
 643         item->blocknr = cpu_to_le64(val);
 644 }
 645
 646 static inline u32 btrfs_root_refs(struct btrfs_root_item *item)
 647 {
 648         return le32_to_cpu(item->refs);
 649 }
 650
 651 static inline void btrfs_set_root_refs(struct btrfs_root_item *item, u32 val)
 652 {
 653         item->refs = cpu_to_le32(val);
 654 }
 655
 656 static inline u64 btrfs_super_blocknr(struct btrfs_super_block *s)
 657 {
 658         return le64_to_cpu(s->blocknr);
 659 }
 660
 661 static inline void btrfs_set_super_blocknr(struct btrfs_super_block *s, u64 val)
 662 {
 663         s->blocknr = cpu_to_le64(val);
 664 }
 665
 666 static inline u64 btrfs_super_root(struct btrfs_super_block *s)
 667 {
 668         return le64_to_cpu(s->root);
 669 }
 670
 671 static inline void btrfs_set_super_root(struct btrfs_super_block *s, u64 val)
 672 {
 673         s->root = cpu_to_le64(val);
 674 }
 675
 676 static inline u64 btrfs_super_total_blocks(struct btrfs_super_block *s)
 677 {
 678         return le64_to_cpu(s->total_blocks);
 679 }
 680
 681 static inline void btrfs_set_super_total_blocks(struct btrfs_super_block *s,
 682                                                 u64 val)
 683 {
 684         s->total_blocks = cpu_to_le64(val);
 685 }
 686
 687 static inline u64 btrfs_super_blocks_used(struct btrfs_super_block *s)
 688 {
 689         return le64_to_cpu(s->blocks_used);
 690 }
 691
 692 static inline void btrfs_set_super_blocks_used(struct btrfs_super_block *s,
 693                                                 u64 val)
 694 {
 695         s->blocks_used = cpu_to_le64(val);
 696 }
 697
 698 static inline u32 btrfs_super_blocksize(struct btrfs_super_block *s)
 699 {
 700         return le32_to_cpu(s->blocksize);
 701 }
 702
 703 static inline void btrfs_set_super_blocksize(struct btrfs_super_block *s,
 704                                                 u32 val)
 705 {
 706         s->blocksize = cpu_to_le32(val);
 707 }
 708
 709 static inline u64 btrfs_super_root_dir(struct btrfs_super_block *s)
 710 {
 711         return le64_to_cpu(s->root_dir_objectid);
 712 }
 713
 714 static inline void btrfs_set_super_root_dir(struct btrfs_super_block *s, u64
 715                                             val)
 716 {
 717         s->root_dir_objectid = cpu_to_le64(val);
 718 }
 719
 720 static inline u8 *btrfs_leaf_data(struct btrfs_leaf *l)
 721 {
 722         return (u8 *)l->items;
 723 }
 724
 725 static inline u64 btrfs_file_extent_disk_blocknr(struct btrfs_file_extent_item
 726                                                  *e)
 727 {
 728         return le64_to_cpu(e->disk_blocknr);
 729 }
 730
 731 static inline void btrfs_set_file_extent_disk_blocknr(struct
 732                                                       btrfs_file_extent_item
 733                                                       *e, u64 val)
 734 {
 735         e->disk_blocknr = cpu_to_le64(val);
 736 }
 737
 738 static inline u64 btrfs_file_extent_disk_num_blocks(struct
 739                                                     btrfs_file_extent_item *e)
 740 {
 741         return le64_to_cpu(e->disk_num_blocks);
 742 }
 743
 744 static inline void btrfs_set_file_extent_disk_num_blocks(struct
 745                                                          btrfs_file_extent_item
 746                                                          *e, u64 val)
 747 {
 748         e->disk_num_blocks = cpu_to_le64(val);
 749 }
 750
 751 static inline u64 btrfs_file_extent_offset(struct btrfs_file_extent_item *e)
 752 {
 753         return le64_to_cpu(e->offset);
 754 }
 755
 756 static inline void btrfs_set_file_extent_offset(struct btrfs_file_extent_item
 757                                                 *e, u64 val)
 758 {
 759         e->offset = cpu_to_le64(val);
 760 }
 761
 762 static inline u64 btrfs_file_extent_num_blocks(struct btrfs_file_extent_item
 763                                                *e)
 764 {
 765         return le64_to_cpu(e->num_blocks);
 766 }
 767
 768 static inline void btrfs_set_file_extent_num_blocks(struct
 769                                                     btrfs_file_extent_item *e,
 770                                                     u64 val)
 771 {
 772         e->num_blocks = cpu_to_le64(val);
 773 }
 774
 775 /* helper function to cast into the data area of the leaf. */
 776 #define btrfs_item_ptr(leaf, slot, type) \
 777         ((type *)(btrfs_leaf_data(leaf) + \
 778         btrfs_item_offset((leaf)->items + (slot))))
 779
 780 struct btrfs_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
 781                                             struct btrfs_root *root);
 782 int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
 783                   struct btrfs_buffer *buf);
 784 int btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
 785                       *root, u64 blocknr, u64 num_blocks, int pin);
 786 int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root
 787                       *root, struct btrfs_key *key, struct btrfs_path *p, int
 788                       ins_len, int cow);
 789 void btrfs_release_path(struct btrfs_root *root, struct btrfs_path *p);
 790 void btrfs_init_path(struct btrfs_path *p);
 791 int btrfs_del_item(struct btrfs_trans_handle *trans, struct btrfs_root *root,
 792                    struct btrfs_path *path);
 793 int btrfs_insert_item(struct btrfs_trans_handle *trans, struct btrfs_root
 794                       *root, struct btrfs_key *key, void *data, u32 data_size);
 795 int btrfs_insert_empty_item(struct btrfs_trans_handle *trans, struct btrfs_root
 796                             *root, struct btrfs_path *path, struct btrfs_key
 797                             *cpu_key, u32 data_size);
 798 int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path);
 799 int btrfs_leaf_free_space(struct btrfs_root *root, struct btrfs_leaf *leaf);
 800 int btrfs_drop_snapshot(struct btrfs_trans_handle *trans, struct btrfs_root
 801                         *root, struct btrfs_buffer *snap);
 802 int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans, struct
 803                                btrfs_root *root);
 804 int btrfs_del_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
 805                    struct btrfs_key *key);
 806 int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root
 807                       *root, struct btrfs_key *key, struct btrfs_root_item
 808                       *item);
 809 int btrfs_update_root(struct btrfs_trans_handle *trans, struct btrfs_root
 810                       *root, struct btrfs_key *key, struct btrfs_root_item
 811                       *item);
 812 int btrfs_find_last_root(struct btrfs_root *root, u64 objectid, struct
 813                          btrfs_root_item *item, struct btrfs_key *key);
 814 int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
 815                           *root, char *name, int name_len, u64 dir, u64
 816                           objectid, u8 type);
 817 int btrfs_lookup_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
 818                           *root, struct btrfs_path *path, u64 dir, char *name,
 819                           int name_len, int mod);
 820 int btrfs_match_dir_item_name(struct btrfs_root *root, struct btrfs_path *path,
 821                               char *name, int name_len);
 822 int btrfs_find_free_objectid(struct btrfs_trans_handle *trans,
 823                              struct btrfs_root *fs_root,
 824                              u64 dirid, u64 *objectid);
 825 int btrfs_insert_inode_map(struct btrfs_trans_handle *trans,
 826                            struct btrfs_root *root,
 827                            u64 objectid, struct btrfs_key *location);
 828 int btrfs_lookup_inode_map(struct btrfs_trans_handle *trans,
 829                            struct btrfs_root *root, struct btrfs_path *path,
 830                            u64 objectid, int mod);
 831 int btrfs_insert_inode(struct btrfs_trans_handle *trans, struct btrfs_root
 832                        *root, u64 objectid, struct btrfs_inode_item
 833                        *inode_item);
 834 int btrfs_lookup_inode(struct btrfs_trans_handle *trans, struct btrfs_root
 835                        *root, struct btrfs_path *path, u64 objectid, int mod);
 836 #endif