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_map.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 #define BTRFS_ROOT_TREE_OBJECTID 1ULL
  34 #define BTRFS_EXTENT_TREE_OBJECTID 2ULL
  35 #define BTRFS_FS_TREE_OBJECTID 3ULL
  36 #define BTRFS_ROOT_TREE_DIR_OBJECTID 4ULL
  37 #define BTRFS_FIRST_FREE_OBJECTID 256ULL
  38
  39 /*
  40  * we can actually store much bigger names, but lets not confuse the rest
  41  * of linux
  42  */
  43 #define BTRFS_NAME_LEN 255
  44
  45 /* 32 bytes in various csum fields */
  46 #define BTRFS_CSUM_SIZE 32
  47 /* four bytes for CRC32 */
  48 #define BTRFS_CRC32_SIZE 4
  49 #define BTRFS_EMPTY_DIR_SIZE 0
  50
  51 #define BTRFS_FT_UNKNOWN        0
  52 #define BTRFS_FT_REG_FILE       1
  53 #define BTRFS_FT_DIR            2
  54 #define BTRFS_FT_CHRDEV         3
  55 #define BTRFS_FT_BLKDEV         4
  56 #define BTRFS_FT_FIFO           5
  57 #define BTRFS_FT_SOCK           6
  58 #define BTRFS_FT_SYMLINK        7
  59 #define BTRFS_FT_XATTR          8
  60 #define BTRFS_FT_MAX            9
  61
  62 /*
  63  * the key defines the order in the tree, and so it also defines (optimal)
  64  * block layout.  objectid corresonds to the inode number.  The flags
  65  * tells us things about the object, and is a kind of stream selector.
  66  * so for a given inode, keys with flags of 1 might refer to the inode
  67  * data, flags of 2 may point to file data in the btree and flags == 3
  68  * may point to extents.
  69  *
  70  * offset is the starting byte offset for this key in the stream.
  71  *
  72  * btrfs_disk_key is in disk byte order.  struct btrfs_key is always
  73  * in cpu native order.  Otherwise they are identical and their sizes
  74  * should be the same (ie both packed)
  75  */
  76 struct btrfs_disk_key {
  77         __le64 objectid;
  78         u8 type;
  79         __le64 offset;
  80 } __attribute__ ((__packed__));
  81
  82 struct btrfs_key {
  83         u64 objectid;
  84         u8 type;
  85         u64 offset;
  86 } __attribute__ ((__packed__));
  87
  88 #define BTRFS_FSID_SIZE 16
  89 /*
  90  * every tree block (leaf or node) starts with this header.
  91  */
  92 struct btrfs_header {
  93         u8 csum[BTRFS_CSUM_SIZE];
  94         u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
  95         __le64 bytenr; /* which block this node is supposed to live in */
  96         __le64 generation;
  97         __le64 owner;
  98         __le32 nritems;
  99         __le16 flags;
 100         u8 level;
 101 } __attribute__ ((__packed__));
 102
 103 #define BTRFS_NODEPTRS_PER_BLOCK(r) (((r)->nodesize - \
 104                                 sizeof(struct btrfs_header)) / \
 105                                 sizeof(struct btrfs_key_ptr))
 106 #define __BTRFS_LEAF_DATA_SIZE(bs) ((bs) - sizeof(struct btrfs_header))
 107 #define BTRFS_LEAF_DATA_SIZE(r) (__BTRFS_LEAF_DATA_SIZE(r->leafsize))
 108 #define BTRFS_MAX_INLINE_DATA_SIZE(r) (BTRFS_LEAF_DATA_SIZE(r) - \
 109                                         sizeof(struct btrfs_item) - \
 110                                         sizeof(struct btrfs_file_extent_item))
 111 /*
 112  * the super block basically lists the main trees of the FS
 113  * it currently lacks any block count etc etc
 114  */
 115 struct btrfs_super_block {
 116         u8 csum[BTRFS_CSUM_SIZE];
 117         /* the first 3 fields must match struct btrfs_header */
 118         u8 fsid[BTRFS_FSID_SIZE];    /* FS specific uuid */
 119         __le64 bytenr; /* this block number */
 120         __le64 magic;
 121         __le64 generation;
 122         __le64 root;
 123         __le64 total_bytes;
 124         __le64 bytes_used;
 125         __le64 root_dir_objectid;
 126         __le32 sectorsize;
 127         __le32 nodesize;
 128         __le32 leafsize;
 129         __le32 stripesize;
 130         u8 root_level;
 131 } __attribute__ ((__packed__));
 132
 133 /*
 134  * A leaf is full of items. offset and size tell us where to find
 135  * the item in the leaf (relative to the start of the data area)
 136  */
 137 struct btrfs_item {
 138         struct btrfs_disk_key key;
 139         __le32 offset;
 140         __le32 size;
 141 } __attribute__ ((__packed__));
 142
 143 /*
 144  * leaves have an item area and a data area:
 145  * [item0, item1....itemN] [free space] [dataN...data1, data0]
 146  *
 147  * The data is separate from the items to get the keys closer together
 148  * during searches.
 149  */
 150 struct btrfs_leaf {
 151         struct btrfs_header header;
 152         struct btrfs_item items[];
 153 } __attribute__ ((__packed__));
 154
 155 /*
 156  * all non-leaf blocks are nodes, they hold only keys and pointers to
 157  * other blocks
 158  */
 159 struct btrfs_key_ptr {
 160         struct btrfs_disk_key key;
 161         __le64 blockptr;
 162         __le64 generation;
 163 } __attribute__ ((__packed__));
 164
 165 struct btrfs_node {
 166         struct btrfs_header header;
 167         struct btrfs_key_ptr ptrs[];
 168 } __attribute__ ((__packed__));
 169
 170 /*
 171  * btrfs_paths remember the path taken from the root down to the leaf.
 172  * level 0 is always the leaf, and nodes[1...BTRFS_MAX_LEVEL] will point
 173  * to any other levels that are present.
 174  *
 175  * The slots array records the index of the item or block pointer
 176  * used while walking the tree.
 177  */
 178 struct btrfs_path {
 179         struct extent_buffer *nodes[BTRFS_MAX_LEVEL];
 180         int slots[BTRFS_MAX_LEVEL];
 181         int reada;
 182         int lowest_level;
 183 };
 184
 185 /*
 186  * items in the extent btree are used to record the objectid of the
 187  * owner of the block and the number of references
 188  */
 189 struct btrfs_extent_item {
 190         __le32 refs;
 191 } __attribute__ ((__packed__));
 192
 193 struct btrfs_extent_ref {
 194         __le64 root;
 195         __le64 generation;
 196         __le64 objectid;
 197         __le64 offset;
 198 } __attribute__ ((__packed__));
 199
 200 struct btrfs_inode_ref {
 201         __le16 name_len;
 202         /* name goes here */
 203 } __attribute__ ((__packed__));
 204
 205 struct btrfs_inode_timespec {
 206         __le64 sec;
 207         __le32 nsec;
 208 } __attribute__ ((__packed__));
 209
 210 /*
 211  * there is no padding here on purpose.  If you want to extent the inode,
 212  * make a new item type
 213  */
 214 struct btrfs_inode_item {
 215         __le64 generation;
 216         __le64 size;
 217         __le64 nblocks;
 218         __le64 block_group;
 219         __le32 nlink;
 220         __le32 uid;
 221         __le32 gid;
 222         __le32 mode;
 223         __le32 rdev;
 224         __le16 flags;
 225         __le16 compat_flags;
 226         struct btrfs_inode_timespec atime;
 227         struct btrfs_inode_timespec ctime;
 228         struct btrfs_inode_timespec mtime;
 229         struct btrfs_inode_timespec otime;
 230 } __attribute__ ((__packed__));
 231
 232 struct btrfs_dir_item {
 233         struct btrfs_disk_key location;
 234         __le16 data_len;
 235         __le16 name_len;
 236         u8 type;
 237 } __attribute__ ((__packed__));
 238
 239 struct btrfs_root_item {
 240         struct btrfs_inode_item inode;
 241         __le64 root_dirid;
 242         __le64 bytenr;
 243         __le64 byte_limit;
 244         __le64 bytes_used;
 245         __le32 flags;
 246         __le32 refs;
 247         struct btrfs_disk_key drop_progress;
 248         u8 drop_level;
 249         u8 level;
 250 } __attribute__ ((__packed__));
 251
 252 #define BTRFS_FILE_EXTENT_REG 0
 253 #define BTRFS_FILE_EXTENT_INLINE 1
 254
 255 struct btrfs_file_extent_item {
 256         __le64 generation;
 257         u8 type;
 258         /*
 259          * disk space consumed by the extent, checksum blocks are included
 260          * in these numbers
 261          */
 262         __le64 disk_bytenr;
 263         __le64 disk_num_bytes;
 264         /*
 265          * the logical offset in file blocks (no csums)
 266          * this extent record is for.  This allows a file extent to point
 267          * into the middle of an existing extent on disk, sharing it
 268          * between two snapshots (useful if some bytes in the middle of the
 269          * extent have changed
 270          */
 271         __le64 offset;
 272         /*
 273          * the logical number of file blocks (no csums included)
 274          */
 275         __le64 num_bytes;
 276 } __attribute__ ((__packed__));
 277
 278 struct btrfs_csum_item {
 279         u8 csum;
 280 } __attribute__ ((__packed__));
 281
 282 /* tag for the radix tree of block groups in ram */
 283 #define BTRFS_BLOCK_GROUP_SIZE (256 * 1024 * 1024)
 284
 285 #define BTRFS_BLOCK_GROUP_DATA 1
 286 #define BTRFS_BLOCK_GROUP_MIXED 2
 287
 288 struct btrfs_block_group_item {
 289         __le64 used;
 290         u8 flags;
 291 } __attribute__ ((__packed__));
 292
 293 struct btrfs_block_group_cache {
 294         struct cache_extent cache;
 295         struct btrfs_key key;
 296         struct btrfs_block_group_item item;
 297         int data;
 298         int cached;
 299         u64 pinned;
 300 };
 301 struct btrfs_extent_ops {
 302        int (*alloc_extent)(struct btrfs_root *root, u64 num_bytes,
 303                            u64 hint_byte, struct btrfs_key *ins);
 304        int (*free_extent)(struct btrfs_root *root, u64 bytenr,
 305                           u64 num_bytes);
 306 };
 307
 308 struct btrfs_fs_info {
 309         u8 fsid[BTRFS_FSID_SIZE];
 310         struct btrfs_root *fs_root;
 311         struct btrfs_root *extent_root;
 312         struct btrfs_root *tree_root;
 313
 314         struct extent_map_tree extent_cache;
 315         struct extent_map_tree free_space_cache;
 316         struct extent_map_tree block_group_cache;
 317         struct extent_map_tree pending_tree;
 318         struct extent_map_tree pinned_extents;
 319         struct extent_map_tree del_pending;
 320         struct extent_map_tree pending_del;
 321         struct extent_map_tree extent_ins;
 322
 323         u64 generation;
 324         u64 last_trans_committed;
 325         struct btrfs_trans_handle *running_transaction;
 326         struct btrfs_super_block super_copy;
 327         struct extent_buffer *sb_buffer;
 328         struct mutex fs_mutex;
 329         int fp;
 330         u64 total_pinned;
 331
 332         struct btrfs_extent_ops *extent_ops;
 333         void *priv_data;
 334 };
 335 /*
 336  * in ram representation of the tree.  extent_root is used for all allocations
 337  * and for the extent tree extent_root root.
 338  */
 339 struct btrfs_root {
 340         struct extent_buffer *node;
 341         struct extent_buffer *commit_root;
 342         struct btrfs_root_item root_item;
 343         struct btrfs_key root_key;
 344         struct btrfs_fs_info *fs_info;
 345         u64 objectid;
 346         u64 last_trans;
 347
 348         /* data allocations are done in sectorsize units */
 349         u32 sectorsize;
 350
 351         /* node allocations are done in nodesize units */
 352         u32 nodesize;
 353
 354         /* leaf allocations are done in leafsize units */
 355         u32 leafsize;
 356
 357         /* leaf allocations are done in leafsize units */
 358         u32 stripesize;
 359
 360         int ref_cows;
 361
 362         u32 type;
 363         u64 highest_inode;
 364         u64 last_inode_alloc;
 365 };
 366
 367 /*
 368  * inode items have the data typically returned from stat and store other
 369  * info about object characteristics.  There is one for every file and dir in
 370  * the FS
 371  */
 372 #define BTRFS_INODE_ITEM_KEY            1
 373 #define BTRFS_INODE_REF_KEY             2
 374 #define BTRFS_XATTR_ITEM_KEY            8
 375
 376 /* reserve 3-15 close to the inode for later flexibility */
 377
 378 /*
 379  * dir items are the name -> inode pointers in a directory.  There is one
 380  * for every name in a directory.
 381  */
 382 #define BTRFS_DIR_ITEM_KEY      16
 383 #define BTRFS_DIR_INDEX_KEY     17
 384 /*
 385  * extent data is for file data
 386  */
 387 #define BTRFS_EXTENT_DATA_KEY   18
 388 /*
 389  * csum items have the checksums for data in the extents
 390  */
 391 #define BTRFS_CSUM_ITEM_KEY     19
 392
 393 /* reserve 20-31 for other file stuff */
 394
 395 /*
 396  * root items point to tree roots.  There are typically in the root
 397  * tree used by the super block to find all the other trees
 398  */
 399 #define BTRFS_ROOT_ITEM_KEY     32
 400 /*
 401  * extent items are in the extent map tree.  These record which blocks
 402  * are used, and how many references there are to each block
 403  */
 404 #define BTRFS_EXTENT_ITEM_KEY   33
 405 #define BTRFS_EXTENT_REF_KEY    34
 406
 407 /*
 408  * block groups give us hints into the extent allocation trees.  Which
 409  * blocks are free etc etc
 410  */
 411 #define BTRFS_BLOCK_GROUP_ITEM_KEY 50
 412
 413 /*
 414  * string items are for debugging.  They just store a short string of
 415  * data in the FS
 416  */
 417 #define BTRFS_STRING_ITEM_KEY   253
 418 /*
 419  * Inode flags
 420  */
 421 #define BTRFS_INODE_NODATASUM           (1 << 0)
 422 #define BTRFS_INODE_NODATACOW           (1 << 1)
 423 #define BTRFS_INODE_READONLY            (1 << 2)
 424
 425 #define read_eb_member(eb, ptr, type, member, result) (                 \
 426         read_extent_buffer(eb, (char *)(result),                        \
 427                            ((unsigned long)(ptr)) +                     \
 428                             offsetof(type, member),                     \
 429                            sizeof(((type *)0)->member)))
 430
 431 #define write_eb_member(eb, ptr, type, member, result) (                \
 432         write_extent_buffer(eb, (char *)(result),                       \
 433                            ((unsigned long)(ptr)) +                     \
 434                             offsetof(type, member),                     \
 435                            sizeof(((type *)0)->member)))
 436
 437 #define BTRFS_SETGET_HEADER_FUNCS(name, type, member, bits)             \
 438 static inline u##bits btrfs_##name(struct extent_buffer *eb)            \
 439 {                                                                       \
 440         struct btrfs_header *h = (struct btrfs_header *)eb->data;       \
 441         return le##bits##_to_cpu(h->member);                            \
 442 }                                                                       \
 443 static inline void btrfs_set_##name(struct extent_buffer *eb,           \
 444                                     u##bits val)                        \
 445 {                                                                       \
 446         struct btrfs_header *h = (struct btrfs_header *)eb->data;       \
 447         h->member = cpu_to_le##bits(val);                               \
 448 }
 449
 450 #define BTRFS_SETGET_FUNCS(name, type, member, bits)                    \
 451 static inline u##bits btrfs_##name(struct extent_buffer *eb,            \
 452                                    type *s)                             \
 453 {                                                                       \
 454         unsigned long offset = (unsigned long)s +                       \
 455                                 offsetof(type, member);                 \
 456         __le##bits *tmp = (__le##bits *)(eb->data + offset);            \
 457         return le##bits##_to_cpu(*tmp);                                 \
 458 }                                                                       \
 459 static inline void btrfs_set_##name(struct extent_buffer *eb,           \
 460                                     type *s, u##bits val)               \
 461 {                                                                       \
 462         unsigned long offset = (unsigned long)s +                       \
 463                                 offsetof(type, member);                 \
 464         __le##bits *tmp = (__le##bits *)(eb->data + offset);            \
 465         *tmp = cpu_to_le##bits(val);                                    \
 466 }
 467
 468 #define BTRFS_SETGET_STACK_FUNCS(name, type, member, bits)              \
 469 static inline u##bits btrfs_##name(type *s)                             \
 470 {                                                                       \
 471         return le##bits##_to_cpu(s->member);                            \
 472 }                                                                       \
 473 static inline void btrfs_set_##name(type *s, u##bits val)               \
 474 {                                                                       \
 475         s->member = cpu_to_le##bits(val);                               \
 476 }
 477
 478 /* struct btrfs_block_group_item */
 479 BTRFS_SETGET_STACK_FUNCS(block_group_used, struct btrfs_block_group_item,
 480                          used, 64);
 481 BTRFS_SETGET_FUNCS(disk_block_group_used, struct btrfs_block_group_item,
 482                          used, 64);
 483
 484 /* struct btrfs_inode_ref */
 485 BTRFS_SETGET_FUNCS(inode_ref_name_len, struct btrfs_inode_ref, name_len, 16);
 486
 487 /* struct btrfs_inode_item */
 488 BTRFS_SETGET_FUNCS(inode_generation, struct btrfs_inode_item, generation, 64);
 489 BTRFS_SETGET_FUNCS(inode_size, struct btrfs_inode_item, size, 64);
 490 BTRFS_SETGET_FUNCS(inode_nblocks, struct btrfs_inode_item, nblocks, 64);
 491 BTRFS_SETGET_FUNCS(inode_block_group, struct btrfs_inode_item, block_group, 64);
 492 BTRFS_SETGET_FUNCS(inode_nlink, struct btrfs_inode_item, nlink, 32);
 493 BTRFS_SETGET_FUNCS(inode_uid, struct btrfs_inode_item, uid, 32);
 494 BTRFS_SETGET_FUNCS(inode_gid, struct btrfs_inode_item, gid, 32);
 495 BTRFS_SETGET_FUNCS(inode_mode, struct btrfs_inode_item, mode, 32);
 496 BTRFS_SETGET_FUNCS(inode_rdev, struct btrfs_inode_item, rdev, 32);
 497 BTRFS_SETGET_FUNCS(inode_flags, struct btrfs_inode_item, flags, 16);
 498 BTRFS_SETGET_FUNCS(inode_compat_flags, struct btrfs_inode_item,
 499                    compat_flags, 16);
 500
 501 BTRFS_SETGET_STACK_FUNCS(stack_inode_generation,
 502                          struct btrfs_inode_item, generation, 64);
 503 BTRFS_SETGET_STACK_FUNCS(stack_inode_size,
 504                          struct btrfs_inode_item, size, 64);
 505 BTRFS_SETGET_STACK_FUNCS(stack_inode_nblocks,
 506                          struct btrfs_inode_item, nblocks, 64);
 507 BTRFS_SETGET_STACK_FUNCS(stack_inode_block_group,
 508                          struct btrfs_inode_item, block_group, 64);
 509 BTRFS_SETGET_STACK_FUNCS(stack_inode_nlink,
 510                          struct btrfs_inode_item, nlink, 32);
 511 BTRFS_SETGET_STACK_FUNCS(stack_inode_uid,
 512                          struct btrfs_inode_item, uid, 32);
 513 BTRFS_SETGET_STACK_FUNCS(stack_inode_gid,
 514                          struct btrfs_inode_item, gid, 32);
 515 BTRFS_SETGET_STACK_FUNCS(stack_inode_mode,
 516                          struct btrfs_inode_item, mode, 32);
 517 BTRFS_SETGET_STACK_FUNCS(stack_inode_rdev,
 518                          struct btrfs_inode_item, rdev, 32);
 519 BTRFS_SETGET_STACK_FUNCS(stack_inode_flags,
 520                          struct btrfs_inode_item, flags, 16);
 521 BTRFS_SETGET_STACK_FUNCS(stack_inode_compat_flags,
 522                          struct btrfs_inode_item, compat_flags, 16);
 523
 524 static inline struct btrfs_inode_timespec *
 525 btrfs_inode_atime(struct btrfs_inode_item *inode_item)
 526 {
 527         unsigned long ptr = (unsigned long)inode_item;
 528         ptr += offsetof(struct btrfs_inode_item, atime);
 529         return (struct btrfs_inode_timespec *)ptr;
 530 }
 531
 532 static inline struct btrfs_inode_timespec *
 533 btrfs_inode_mtime(struct btrfs_inode_item *inode_item)
 534 {
 535         unsigned long ptr = (unsigned long)inode_item;
 536         ptr += offsetof(struct btrfs_inode_item, mtime);
 537         return (struct btrfs_inode_timespec *)ptr;
 538 }
 539
 540 static inline struct btrfs_inode_timespec *
 541 btrfs_inode_ctime(struct btrfs_inode_item *inode_item)
 542 {
 543         unsigned long ptr = (unsigned long)inode_item;
 544         ptr += offsetof(struct btrfs_inode_item, ctime);
 545         return (struct btrfs_inode_timespec *)ptr;
 546 }
 547
 548 static inline struct btrfs_inode_timespec *
 549 btrfs_inode_otime(struct btrfs_inode_item *inode_item)
 550 {
 551         unsigned long ptr = (unsigned long)inode_item;
 552         ptr += offsetof(struct btrfs_inode_item, otime);
 553         return (struct btrfs_inode_timespec *)ptr;
 554 }
 555
 556 BTRFS_SETGET_FUNCS(timespec_sec, struct btrfs_inode_timespec, sec, 64);
 557 BTRFS_SETGET_FUNCS(timespec_nsec, struct btrfs_inode_timespec, nsec, 32);
 558 BTRFS_SETGET_STACK_FUNCS(stack_timespec_sec, struct btrfs_inode_timespec,
 559                          sec, 64);
 560 BTRFS_SETGET_STACK_FUNCS(stack_timespec_nsec, struct btrfs_inode_timespec,
 561                          nsec, 32);
 562
 563 /* struct btrfs_extent_item */
 564 BTRFS_SETGET_FUNCS(extent_refs, struct btrfs_extent_item, refs, 32);
 565
 566 /* struct btrfs_extent_ref */
 567 BTRFS_SETGET_FUNCS(ref_root, struct btrfs_extent_ref, root, 64);
 568 BTRFS_SETGET_FUNCS(ref_generation, struct btrfs_extent_ref, generation, 64);
 569 BTRFS_SETGET_FUNCS(ref_objectid, struct btrfs_extent_ref, objectid, 64);
 570 BTRFS_SETGET_FUNCS(ref_offset, struct btrfs_extent_ref, offset, 64);
 571
 572 BTRFS_SETGET_STACK_FUNCS(stack_ref_root, struct btrfs_extent_ref, root, 64);
 573 BTRFS_SETGET_STACK_FUNCS(stack_ref_generation, struct btrfs_extent_ref,
 574                          generation, 64);
 575 BTRFS_SETGET_STACK_FUNCS(stack_ref_objectid, struct btrfs_extent_ref,
 576                          objectid, 64);
 577 BTRFS_SETGET_STACK_FUNCS(stack_ref_offset, struct btrfs_extent_ref, offset, 64);
 578
 579 BTRFS_SETGET_STACK_FUNCS(stack_extent_refs, struct btrfs_extent_item,
 580                          refs, 32);
 581
 582 /* struct btrfs_node */
 583 BTRFS_SETGET_FUNCS(key_blockptr, struct btrfs_key_ptr, blockptr, 64);
 584 BTRFS_SETGET_FUNCS(key_generation, struct btrfs_key_ptr, generation, 64);
 585
 586 static inline u64 btrfs_node_blockptr(struct extent_buffer *eb, int nr)
 587 {
 588         unsigned long ptr;
 589         ptr = offsetof(struct btrfs_node, ptrs) +
 590                 sizeof(struct btrfs_key_ptr) * nr;
 591         return btrfs_key_blockptr(eb, (struct btrfs_key_ptr *)ptr);
 592 }
 593
 594 static inline void btrfs_set_node_blockptr(struct extent_buffer *eb,
 595                                            int nr, u64 val)
 596 {
 597         unsigned long ptr;
 598         ptr = offsetof(struct btrfs_node, ptrs) +
 599                 sizeof(struct btrfs_key_ptr) * nr;
 600         btrfs_set_key_blockptr(eb, (struct btrfs_key_ptr *)ptr, val);
 601 }
 602
 603 static inline u64 btrfs_node_ptr_generation(struct extent_buffer *eb, int nr)
 604 {
 605         unsigned long ptr;
 606         ptr = offsetof(struct btrfs_node, ptrs) +
 607                 sizeof(struct btrfs_key_ptr) * nr;
 608         return btrfs_key_generation(eb, (struct btrfs_key_ptr *)ptr);
 609 }
 610
 611 static inline void btrfs_set_node_ptr_generation(struct extent_buffer *eb,
 612                                                  int nr, u64 val)
 613 {
 614         unsigned long ptr;
 615         ptr = offsetof(struct btrfs_node, ptrs) +
 616                 sizeof(struct btrfs_key_ptr) * nr;
 617         btrfs_set_key_generation(eb, (struct btrfs_key_ptr *)ptr, val);
 618 }
 619
 620 static inline unsigned long btrfs_node_key_ptr_offset(int nr)
 621 {
 622         return offsetof(struct btrfs_node, ptrs) +
 623                 sizeof(struct btrfs_key_ptr) * nr;
 624 }
 625
 626 static inline void btrfs_node_key(struct extent_buffer *eb,
 627                                   struct btrfs_disk_key *disk_key, int nr)
 628 {
 629         unsigned long ptr;
 630         ptr = btrfs_node_key_ptr_offset(nr);
 631         read_eb_member(eb, (struct btrfs_key_ptr *)ptr,
 632                        struct btrfs_key_ptr, key, disk_key);
 633 }
 634
 635 static inline void btrfs_set_node_key(struct extent_buffer *eb,
 636                                       struct btrfs_disk_key *disk_key, int nr)
 637 {
 638         unsigned long ptr;
 639         ptr = btrfs_node_key_ptr_offset(nr);
 640         write_eb_member(eb, (struct btrfs_key_ptr *)ptr,
 641                        struct btrfs_key_ptr, key, disk_key);
 642 }
 643
 644 /* struct btrfs_item */
 645 BTRFS_SETGET_FUNCS(item_offset, struct btrfs_item, offset, 32);
 646 BTRFS_SETGET_FUNCS(item_size, struct btrfs_item, size, 32);
 647
 648 static inline unsigned long btrfs_item_nr_offset(int nr)
 649 {
 650         return offsetof(struct btrfs_leaf, items) +
 651                 sizeof(struct btrfs_item) * nr;
 652 }
 653
 654 static inline struct btrfs_item *btrfs_item_nr(struct extent_buffer *eb,
 655                                                int nr)
 656 {
 657         return (struct btrfs_item *)btrfs_item_nr_offset(nr);
 658 }
 659
 660 static inline u32 btrfs_item_end(struct extent_buffer *eb,
 661                                  struct btrfs_item *item)
 662 {
 663         return btrfs_item_offset(eb, item) + btrfs_item_size(eb, item);
 664 }
 665
 666 static inline u32 btrfs_item_end_nr(struct extent_buffer *eb, int nr)
 667 {
 668         return btrfs_item_end(eb, btrfs_item_nr(eb, nr));
 669 }
 670
 671 static inline u32 btrfs_item_offset_nr(struct extent_buffer *eb, int nr)
 672 {
 673         return btrfs_item_offset(eb, btrfs_item_nr(eb, nr));
 674 }
 675
 676 static inline u32 btrfs_item_size_nr(struct extent_buffer *eb, int nr)
 677 {
 678         return btrfs_item_size(eb, btrfs_item_nr(eb, nr));
 679 }
 680
 681 static inline void btrfs_item_key(struct extent_buffer *eb,
 682                            struct btrfs_disk_key *disk_key, int nr)
 683 {
 684         struct btrfs_item *item = btrfs_item_nr(eb, nr);
 685         read_eb_member(eb, item, struct btrfs_item, key, disk_key);
 686 }
 687
 688 static inline void btrfs_set_item_key(struct extent_buffer *eb,
 689                                struct btrfs_disk_key *disk_key, int nr)
 690 {
 691         struct btrfs_item *item = btrfs_item_nr(eb, nr);
 692         write_eb_member(eb, item, struct btrfs_item, key, disk_key);
 693 }
 694
 695 /* struct btrfs_dir_item */
 696 BTRFS_SETGET_FUNCS(dir_data_len, struct btrfs_dir_item, data_len, 16);
 697 BTRFS_SETGET_FUNCS(dir_type, struct btrfs_dir_item, type, 8);
 698 BTRFS_SETGET_FUNCS(dir_name_len, struct btrfs_dir_item, name_len, 16);
 699
 700 static inline void btrfs_dir_item_key(struct extent_buffer *eb,
 701                                       struct btrfs_dir_item *item,
 702                                       struct btrfs_disk_key *key)
 703 {
 704         read_eb_member(eb, item, struct btrfs_dir_item, location, key);
 705 }
 706
 707 static inline void btrfs_set_dir_item_key(struct extent_buffer *eb,
 708                                           struct btrfs_dir_item *item,
 709                                           struct btrfs_disk_key *key)
 710 {
 711         write_eb_member(eb, item, struct btrfs_dir_item, location, key);
 712 }
 713
 714 /* struct btrfs_disk_key */
 715 BTRFS_SETGET_STACK_FUNCS(disk_key_objectid, struct btrfs_disk_key,
 716                          objectid, 64);
 717 BTRFS_SETGET_STACK_FUNCS(disk_key_offset, struct btrfs_disk_key, offset, 64);
 718 BTRFS_SETGET_STACK_FUNCS(disk_key_type, struct btrfs_disk_key, type, 8);
 719
 720 static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu,
 721                                          struct btrfs_disk_key *disk)
 722 {
 723         cpu->offset = le64_to_cpu(disk->offset);
 724         cpu->type = disk->type;
 725         cpu->objectid = le64_to_cpu(disk->objectid);
 726 }
 727
 728 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk,
 729                                          struct btrfs_key *cpu)
 730 {
 731         disk->offset = cpu_to_le64(cpu->offset);
 732         disk->type = cpu->type;
 733         disk->objectid = cpu_to_le64(cpu->objectid);
 734 }
 735
 736 static inline void btrfs_node_key_to_cpu(struct extent_buffer *eb,
 737                                   struct btrfs_key *key, int nr)
 738 {
 739         struct btrfs_disk_key disk_key;
 740         btrfs_node_key(eb, &disk_key, nr);
 741         btrfs_disk_key_to_cpu(key, &disk_key);
 742 }
 743
 744 static inline void btrfs_item_key_to_cpu(struct extent_buffer *eb,
 745                                   struct btrfs_key *key, int nr)
 746 {
 747         struct btrfs_disk_key disk_key;
 748         btrfs_item_key(eb, &disk_key, nr);
 749         btrfs_disk_key_to_cpu(key, &disk_key);
 750 }
 751
 752 static inline void btrfs_dir_item_key_to_cpu(struct extent_buffer *eb,
 753                                       struct btrfs_dir_item *item,
 754                                       struct btrfs_key *key)
 755 {
 756         struct btrfs_disk_key disk_key;
 757         btrfs_dir_item_key(eb, item, &disk_key);
 758         btrfs_disk_key_to_cpu(key, &disk_key);
 759 }
 760
 761
 762 static inline u8 btrfs_key_type(struct btrfs_key *key)
 763 {
 764         return key->type;
 765 }
 766
 767 static inline void btrfs_set_key_type(struct btrfs_key *key, u8 val)
 768 {
 769         key->type = val;
 770 }
 771
 772 /* struct btrfs_header */
 773 BTRFS_SETGET_HEADER_FUNCS(header_bytenr, struct btrfs_header, bytenr, 64);
 774 BTRFS_SETGET_HEADER_FUNCS(header_generation, struct btrfs_header,
 775                           generation, 64);
 776 BTRFS_SETGET_HEADER_FUNCS(header_owner, struct btrfs_header, owner, 64);
 777 BTRFS_SETGET_HEADER_FUNCS(header_nritems, struct btrfs_header, nritems, 32);
 778 BTRFS_SETGET_HEADER_FUNCS(header_flags, struct btrfs_header, flags, 16);
 779 BTRFS_SETGET_HEADER_FUNCS(header_level, struct btrfs_header, level, 8);
 780
 781 static inline u8 *btrfs_header_fsid(struct extent_buffer *eb)
 782 {
 783         unsigned long ptr = offsetof(struct btrfs_header, fsid);
 784         return (u8 *)ptr;
 785 }
 786
 787 static inline u8 *btrfs_super_fsid(struct extent_buffer *eb)
 788 {
 789         unsigned long ptr = offsetof(struct btrfs_super_block, fsid);
 790         return (u8 *)ptr;
 791 }
 792
 793 static inline u8 *btrfs_header_csum(struct extent_buffer *eb)
 794 {
 795         unsigned long ptr = offsetof(struct btrfs_header, csum);
 796         return (u8 *)ptr;
 797 }
 798
 799 static inline struct btrfs_node *btrfs_buffer_node(struct extent_buffer *eb)
 800 {
 801         return NULL;
 802 }
 803
 804 static inline struct btrfs_leaf *btrfs_buffer_leaf(struct extent_buffer *eb)
 805 {
 806         return NULL;
 807 }
 808
 809 static inline struct btrfs_header *btrfs_buffer_header(struct extent_buffer *eb)
 810 {
 811         return NULL;
 812 }
 813
 814 static inline int btrfs_is_leaf(struct extent_buffer *eb)
 815 {
 816         return (btrfs_header_level(eb) == 0);
 817 }
 818
 819 /* struct btrfs_root_item */
 820 BTRFS_SETGET_FUNCS(disk_root_refs, struct btrfs_root_item, refs, 32);
 821 BTRFS_SETGET_FUNCS(disk_root_bytenr, struct btrfs_root_item, bytenr, 64);
 822 BTRFS_SETGET_FUNCS(disk_root_level, struct btrfs_root_item, level, 8);
 823
 824 BTRFS_SETGET_STACK_FUNCS(root_bytenr, struct btrfs_root_item, bytenr, 64);
 825 BTRFS_SETGET_STACK_FUNCS(root_level, struct btrfs_root_item, level, 8);
 826 BTRFS_SETGET_STACK_FUNCS(root_dirid, struct btrfs_root_item, root_dirid, 64);
 827 BTRFS_SETGET_STACK_FUNCS(root_refs, struct btrfs_root_item, refs, 32);
 828 BTRFS_SETGET_STACK_FUNCS(root_flags, struct btrfs_root_item, flags, 32);
 829 BTRFS_SETGET_STACK_FUNCS(root_used, struct btrfs_root_item, bytes_used, 64);
 830 BTRFS_SETGET_STACK_FUNCS(root_limit, struct btrfs_root_item, byte_limit, 64);
 831
 832 /* struct btrfs_super_block */
 833 BTRFS_SETGET_STACK_FUNCS(super_bytenr, struct btrfs_super_block, bytenr, 64);
 834 BTRFS_SETGET_STACK_FUNCS(super_generation, struct btrfs_super_block,
 835                          generation, 64);
 836 BTRFS_SETGET_STACK_FUNCS(super_root, struct btrfs_super_block, root, 64);
 837 BTRFS_SETGET_STACK_FUNCS(super_root_level, struct btrfs_super_block,
 838                          root_level, 8);
 839 BTRFS_SETGET_STACK_FUNCS(super_total_bytes, struct btrfs_super_block,
 840                          total_bytes, 64);
 841 BTRFS_SETGET_STACK_FUNCS(super_bytes_used, struct btrfs_super_block,
 842                          bytes_used, 64);
 843 BTRFS_SETGET_STACK_FUNCS(super_sectorsize, struct btrfs_super_block,
 844                          sectorsize, 32);
 845 BTRFS_SETGET_STACK_FUNCS(super_nodesize, struct btrfs_super_block,
 846                          nodesize, 32);
 847 BTRFS_SETGET_STACK_FUNCS(super_leafsize, struct btrfs_super_block,
 848                          leafsize, 32);
 849 BTRFS_SETGET_STACK_FUNCS(super_stripesize, struct btrfs_super_block,
 850                          stripesize, 32);
 851 BTRFS_SETGET_STACK_FUNCS(super_root_dir, struct btrfs_super_block,
 852                          root_dir_objectid, 64);
 853
 854 static inline unsigned long btrfs_leaf_data(struct extent_buffer *l)
 855 {
 856         return offsetof(struct btrfs_leaf, items);
 857 }
 858
 859 /* struct btrfs_file_extent_item */
 860 BTRFS_SETGET_FUNCS(file_extent_type, struct btrfs_file_extent_item, type, 8);
 861
 862 static inline unsigned long btrfs_file_extent_inline_start(struct
 863                                                    btrfs_file_extent_item *e)
 864 {
 865         unsigned long offset = (unsigned long)e;
 866         offset += offsetof(struct btrfs_file_extent_item, disk_bytenr);
 867         return offset;
 868 }
 869
 870 static inline u32 btrfs_file_extent_calc_inline_size(u32 datasize)
 871 {
 872         return offsetof(struct btrfs_file_extent_item, disk_bytenr) + datasize;
 873 }
 874
 875 static inline u32 btrfs_file_extent_inline_len(struct extent_buffer *eb,
 876                                                struct btrfs_item *e)
 877 {
 878         unsigned long offset;
 879         offset = offsetof(struct btrfs_file_extent_item, disk_bytenr);
 880         return btrfs_item_size(eb, e) - offset;
 881 }
 882
 883 BTRFS_SETGET_FUNCS(file_extent_disk_bytenr, struct btrfs_file_extent_item,
 884                    disk_bytenr, 64);
 885 BTRFS_SETGET_FUNCS(file_extent_generation, struct btrfs_file_extent_item,
 886                    generation, 64);
 887 BTRFS_SETGET_FUNCS(file_extent_disk_num_bytes, struct btrfs_file_extent_item,
 888                    disk_num_bytes, 64);
 889 BTRFS_SETGET_FUNCS(file_extent_offset, struct btrfs_file_extent_item,
 890                   offset, 64);
 891 BTRFS_SETGET_FUNCS(file_extent_num_bytes, struct btrfs_file_extent_item,
 892                    num_bytes, 64);
 893
 894 static inline u32 btrfs_level_size(struct btrfs_root *root, int level) {
 895         if (level == 0)
 896                 return root->leafsize;
 897         return root->nodesize;
 898 }
 899
 900 /* helper function to cast into the data area of the leaf. */
 901 #define btrfs_item_ptr(leaf, slot, type) \
 902         ((type *)(btrfs_leaf_data(leaf) + \
 903         btrfs_item_offset_nr(leaf, slot)))
 904
 905 #define btrfs_item_ptr_offset(leaf, slot) \
 906         ((unsigned long)(btrfs_leaf_data(leaf) + \
 907         btrfs_item_offset_nr(leaf, slot)))
 908
 909 /* extent-tree.c */
 910 u32 btrfs_count_snapshots_in_path(struct btrfs_root *root,
 911                                   struct btrfs_path *count_path,
 912                                   u64 first_extent);
 913 int btrfs_extent_post_op(struct btrfs_trans_handle *trans,
 914                          struct btrfs_root *root);
 915 int btrfs_copy_pinned(struct btrfs_root *root, struct extent_map_tree *copy);
 916 struct btrfs_block_group_cache *btrfs_lookup_block_group(struct
 917                                                          btrfs_fs_info *info,
 918                                                          u64 bytenr);
 919 struct btrfs_block_group_cache *btrfs_find_block_group(struct btrfs_root *root,
 920                                                  struct btrfs_block_group_cache
 921                                                  *hint, u64 search_start,
 922                                                  int data, int owner);
 923 int btrfs_inc_root_ref(struct btrfs_trans_handle *trans,
 924                        struct btrfs_root *root, u64 owner_objectid);
 925 struct extent_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
 926                                             struct btrfs_root *root, u32 size,
 927                                             u64 root_objectid,
 928                                             u64 hint, u64 empty_size);
 929 struct extent_buffer *__btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
 930                                              struct btrfs_root *root,
 931                                              u32 blocksize,
 932                                              u64 root_objectid,
 933                                              u64 ref_generation,
 934                                              u64 first_objectid,
 935                                              int level,
 936                                              u64 hint,
 937                                              u64 empty_size);
 938 int btrfs_grow_extent_tree(struct btrfs_trans_handle *trans,
 939                            struct btrfs_root *root, u64 new_size);
 940 int btrfs_shrink_extent_tree(struct btrfs_root *root, u64 new_size);
 941 int btrfs_insert_extent_backref(struct btrfs_trans_handle *trans,
 942                                  struct btrfs_root *root,
 943                                  struct btrfs_path *path, u64 bytenr,
 944                                  u64 root_objectid, u64 ref_generation,
 945                                  u64 owner, u64 owner_offset);
 946 int btrfs_alloc_extent(struct btrfs_trans_handle *trans,
 947                        struct btrfs_root *root,
 948                        u64 num_bytes, u64 root_objectid, u64 ref_generation,
 949                        u64 owner, u64 owner_offset,
 950                        u64 empty_size, u64 hint_byte,
 951                        u64 search_end, struct btrfs_key *ins, int data);
 952 int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
 953                   struct extent_buffer *buf);
 954 int btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
 955                       *root, u64 bytenr, u64 num_bytes,
 956                       u64 root_objectid, u64 ref_generation,
 957                       u64 owner_objectid, u64 owner_offset, int pin);
 958 int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans,
 959                                struct btrfs_root *root,
 960                                struct extent_map_tree *unpin);
 961 int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
 962                                 struct btrfs_root *root,
 963                                 u64 bytenr, u64 num_bytes,
 964                                 u64 root_objectid, u64 ref_generation,
 965                                 u64 owner, u64 owner_offset);
 966 int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans,
 967                                     struct btrfs_root *root);
 968 int btrfs_free_block_groups(struct btrfs_fs_info *info);
 969 int btrfs_read_block_groups(struct btrfs_root *root);
 970 int btrfs_make_block_groups(struct btrfs_trans_handle *trans,
 971                             struct btrfs_root *root);
 972 u64 btrfs_hash_extent_ref(u64 root_objectid, u64 ref_generation,
 973                           u64 owner, u64 owner_offset);
 974 int btrfs_update_block_group(struct btrfs_trans_handle *trans,
 975                              struct btrfs_root *root, u64 bytenr, u64 num,
 976                              int alloc, int mark_free, int data);
 977 /* ctree.c */
 978 int btrfs_comp_keys(struct btrfs_disk_key *disk, struct btrfs_key *k2);
 979 int btrfs_cow_block(struct btrfs_trans_handle *trans,
 980                     struct btrfs_root *root, struct extent_buffer *buf,
 981                     struct extent_buffer *parent, int parent_slot,
 982                     struct extent_buffer **cow_ret);
 983 int btrfs_copy_root(struct btrfs_trans_handle *trans,
 984                       struct btrfs_root *root,
 985                       struct extent_buffer *buf,
 986                       struct extent_buffer **cow_ret, u64 new_root_objectid);
 987 int btrfs_extend_item(struct btrfs_trans_handle *trans, struct btrfs_root
 988                       *root, struct btrfs_path *path, u32 data_size);
 989 int btrfs_truncate_item(struct btrfs_trans_handle *trans,
 990                         struct btrfs_root *root,
 991                         struct btrfs_path *path,
 992                         u32 new_size, int from_end);
 993 int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root
 994                       *root, struct btrfs_key *key, struct btrfs_path *p, int
 995                       ins_len, int cow);
 996 int btrfs_realloc_node(struct btrfs_trans_handle *trans,
 997                        struct btrfs_root *root, struct extent_buffer *parent,
 998                        int start_slot, int cache_only, u64 *last_ret,
 999                        struct btrfs_key *progress);
1000 void btrfs_release_path(struct btrfs_root *root, struct btrfs_path *p);
1001 struct btrfs_path *btrfs_alloc_path(void);
1002 void btrfs_free_path(struct btrfs_path *p);
1003 void btrfs_init_path(struct btrfs_path *p);
1004 int btrfs_del_item(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1005                    struct btrfs_path *path);
1006 int btrfs_insert_item(struct btrfs_trans_handle *trans, struct btrfs_root
1007                       *root, struct btrfs_key *key, void *data, u32 data_size);
1008 int btrfs_insert_empty_item(struct btrfs_trans_handle *trans, struct btrfs_root
1009                             *root, struct btrfs_path *path, struct btrfs_key
1010                             *cpu_key, u32 data_size);
1011 int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path);
1012 int btrfs_prev_leaf(struct btrfs_root *root, struct btrfs_path *path);
1013 int btrfs_leaf_free_space(struct btrfs_root *root, struct extent_buffer *leaf);
1014 int btrfs_drop_snapshot(struct btrfs_trans_handle *trans, struct btrfs_root
1015                         *root);
1016
1017
1018 /* root-item.c */
1019 int btrfs_del_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1020                    struct btrfs_key *key);
1021 int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root
1022                       *root, struct btrfs_key *key, struct btrfs_root_item
1023                       *item);
1024 int btrfs_update_root(struct btrfs_trans_handle *trans, struct btrfs_root
1025                       *root, struct btrfs_key *key, struct btrfs_root_item
1026                       *item);
1027 int btrfs_find_last_root(struct btrfs_root *root, u64 objectid, struct
1028                          btrfs_root_item *item, struct btrfs_key *key);
1029 int btrfs_find_dead_roots(struct btrfs_root *root, u64 objectid,
1030                           struct btrfs_root *latest_root);
1031 /* dir-item.c */
1032 int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
1033                           *root, const char *name, int name_len, u64 dir,
1034                           struct btrfs_key *location, u8 type);
1035 struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans,
1036                                              struct btrfs_root *root,
1037                                              struct btrfs_path *path, u64 dir,
1038                                              const char *name, int name_len,
1039                                              int mod);
1040 struct btrfs_dir_item *
1041 btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans,
1042                             struct btrfs_root *root,
1043                             struct btrfs_path *path, u64 dir,
1044                             u64 objectid, const char *name, int name_len,
1045                             int mod);
1046 struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_root *root,
1047                               struct btrfs_path *path,
1048                               const char *name, int name_len);
1049 int btrfs_delete_one_dir_name(struct btrfs_trans_handle *trans,
1050                               struct btrfs_root *root,
1051                               struct btrfs_path *path,
1052                               struct btrfs_dir_item *di);
1053 int btrfs_insert_xattr_item(struct btrfs_trans_handle *trans,
1054                             struct btrfs_root *root, const char *name,
1055                             u16 name_len, const void *data, u16 data_len,
1056                             u64 dir);
1057 struct btrfs_dir_item *btrfs_lookup_xattr(struct btrfs_trans_handle *trans,
1058                                           struct btrfs_root *root,
1059                                           struct btrfs_path *path, u64 dir,
1060                                           const char *name, u16 name_len,
1061                                           int mod);
1062 /* inode-map.c */
1063 int btrfs_find_free_objectid(struct btrfs_trans_handle *trans,
1064                              struct btrfs_root *fs_root,
1065                              u64 dirid, u64 *objectid);
1066 int btrfs_find_highest_inode(struct btrfs_root *fs_root, u64 *objectid);
1067
1068 /* inode-item.c */
1069 int btrfs_insert_inode_ref(struct btrfs_trans_handle *trans,
1070                            struct btrfs_root *root,
1071                            const char *name, int name_len,
1072                            u64 inode_objectid, u64 ref_objectid);
1073 int btrfs_del_inode_ref(struct btrfs_trans_handle *trans,
1074                            struct btrfs_root *root,
1075                            const char *name, int name_len,
1076                            u64 inode_objectid, u64 ref_objectid);
1077 int btrfs_insert_empty_inode(struct btrfs_trans_handle *trans,
1078                              struct btrfs_root *root,
1079                              struct btrfs_path *path, u64 objectid);
1080 int btrfs_insert_inode(struct btrfs_trans_handle *trans, struct btrfs_root
1081                        *root, u64 objectid, struct btrfs_inode_item
1082                        *inode_item);
1083 int btrfs_lookup_inode(struct btrfs_trans_handle *trans, struct btrfs_root
1084                        *root, struct btrfs_path *path,
1085                        struct btrfs_key *location, int mod);
1086
1087 /* file-item.c */
1088 int btrfs_insert_file_extent(struct btrfs_trans_handle *trans,
1089                              struct btrfs_root *root,
1090                              u64 objectid, u64 pos, u64 offset,
1091                              u64 disk_num_bytes,
1092                              u64 num_bytes);
1093 int btrfs_insert_inline_extent(struct btrfs_trans_handle *trans,
1094                                 struct btrfs_root *root, u64 objectid,
1095                                 u64 offset, char *buffer, size_t size);
1096 int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
1097                              struct btrfs_root *root,
1098                              struct btrfs_path *path, u64 objectid,
1099                              u64 bytenr, int mod);
1100 int btrfs_csum_file_block(struct btrfs_trans_handle *trans,
1101                           struct btrfs_root *root,
1102                           struct btrfs_inode_item *inode,
1103                           u64 objectid, u64 offset,
1104                           char *data, size_t len);
1105 struct btrfs_csum_item *btrfs_lookup_csum(struct btrfs_trans_handle *trans,
1106                                           struct btrfs_root *root,
1107                                           struct btrfs_path *path,
1108                                           u64 objectid, u64 offset,
1109                                           int cow);
1110 int btrfs_csum_truncate(struct btrfs_trans_handle *trans,
1111                         struct btrfs_root *root, struct btrfs_path *path,
1112                         u64 isize);
1113 #endif