fs/btrfs/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 <linux/version.h>
  23 #include <linux/mm.h>
  24 #include <linux/highmem.h>
  25 #include <linux/fs.h>
  26 #include <linux/workqueue.h>
  27 #include <linux/completion.h>
  28 #include <asm/kmap_types.h>
  29 #include "bit-radix.h"
  30 #include "extent_map.h"
  31
  32 struct btrfs_trans_handle;
  33 struct btrfs_transaction;
  34 extern struct kmem_cache *btrfs_trans_handle_cachep;
  35 extern struct kmem_cache *btrfs_transaction_cachep;
  36 extern struct kmem_cache *btrfs_bit_radix_cachep;
  37 extern struct kmem_cache *btrfs_path_cachep;
  38
  39 #define BTRFS_MAGIC "_B2RfS_M"
  40
  41 #define BTRFS_MAX_LEVEL 8
  42 #define BTRFS_ROOT_TREE_OBJECTID 1ULL
  43 #define BTRFS_EXTENT_TREE_OBJECTID 2ULL
  44 #define BTRFS_FS_TREE_OBJECTID 3ULL
  45 #define BTRFS_ROOT_TREE_DIR_OBJECTID 4ULL
  46 #define BTRFS_FIRST_FREE_OBJECTID 256ULL
  47
  48 /*
  49  * we can actually store much bigger names, but lets not confuse the rest
  50  * of linux
  51  */
  52 #define BTRFS_NAME_LEN 255
  53
  54 /* 32 bytes in various csum fields */
  55 #define BTRFS_CSUM_SIZE 32
  56 /* four bytes for CRC32 */
  57 #define BTRFS_CRC32_SIZE 4
  58 #define BTRFS_EMPTY_DIR_SIZE 0
  59
  60 #define BTRFS_FT_UNKNOWN        0
  61 #define BTRFS_FT_REG_FILE       1
  62 #define BTRFS_FT_DIR            2
  63 #define BTRFS_FT_CHRDEV         3
  64 #define BTRFS_FT_BLKDEV         4
  65 #define BTRFS_FT_FIFO           5
  66 #define BTRFS_FT_SOCK           6
  67 #define BTRFS_FT_SYMLINK        7
  68 #define BTRFS_FT_XATTR          8
  69 #define BTRFS_FT_MAX            9
  70
  71 /*
  72  * the key defines the order in the tree, and so it also defines (optimal)
  73  * block layout.  objectid corresonds to the inode number.  The flags
  74  * tells us things about the object, and is a kind of stream selector.
  75  * so for a given inode, keys with flags of 1 might refer to the inode
  76  * data, flags of 2 may point to file data in the btree and flags == 3
  77  * may point to extents.
  78  *
  79  * offset is the starting byte offset for this key in the stream.
  80  *
  81  * btrfs_disk_key is in disk byte order.  struct btrfs_key is always
  82  * in cpu native order.  Otherwise they are identical and their sizes
  83  * should be the same (ie both packed)
  84  */
  85 struct btrfs_disk_key {
  86         __le64 objectid;
  87         u8 type;
  88         __le64 offset;
  89 } __attribute__ ((__packed__));
  90
  91 struct btrfs_key {
  92         u64 objectid;
  93         u8 type;
  94         u64 offset;
  95 } __attribute__ ((__packed__));
  96
  97 #define BTRFS_FSID_SIZE 16
  98 /*
  99  * every tree block (leaf or node) starts with this header.
 100  */
 101 struct btrfs_header {
 102         u8 csum[BTRFS_CSUM_SIZE];
 103         u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
 104         __le64 bytenr; /* which block this node is supposed to live in */
 105         __le64 generation;
 106         __le64 owner;
 107         __le32 nritems;
 108         __le16 flags;
 109         u8 level;
 110 } __attribute__ ((__packed__));
 111
 112 #define BTRFS_NODEPTRS_PER_BLOCK(r) (((r)->nodesize - \
 113                                 sizeof(struct btrfs_header)) / \
 114                                 sizeof(struct btrfs_key_ptr))
 115 #define __BTRFS_LEAF_DATA_SIZE(bs) ((bs) - sizeof(struct btrfs_header))
 116 #define BTRFS_LEAF_DATA_SIZE(r) (__BTRFS_LEAF_DATA_SIZE(r->leafsize))
 117 #define BTRFS_MAX_INLINE_DATA_SIZE(r) (BTRFS_LEAF_DATA_SIZE(r) - \
 118                                         sizeof(struct btrfs_item) - \
 119                                         sizeof(struct btrfs_file_extent_item))
 120
 121 /*
 122  * the super block basically lists the main trees of the FS
 123  * it currently lacks any block count etc etc
 124  */
 125 struct btrfs_super_block {
 126         u8 csum[BTRFS_CSUM_SIZE];
 127         /* the first 3 fields must match struct btrfs_header */
 128         u8 fsid[16];    /* FS specific uuid */
 129         __le64 bytenr; /* this block number */
 130         __le64 magic;
 131         __le64 generation;
 132         __le64 root;
 133         __le64 total_bytes;
 134         __le64 bytes_used;
 135         __le64 root_dir_objectid;
 136         __le32 sectorsize;
 137         __le32 nodesize;
 138         __le32 leafsize;
 139         __le32 stripesize;
 140         u8 root_level;
 141 } __attribute__ ((__packed__));
 142
 143 /*
 144  * A leaf is full of items. offset and size tell us where to find
 145  * the item in the leaf (relative to the start of the data area)
 146  */
 147 struct btrfs_item {
 148         struct btrfs_disk_key key;
 149         __le32 offset;
 150         __le32 size;
 151 } __attribute__ ((__packed__));
 152
 153 /*
 154  * leaves have an item area and a data area:
 155  * [item0, item1....itemN] [free space] [dataN...data1, data0]
 156  *
 157  * The data is separate from the items to get the keys closer together
 158  * during searches.
 159  */
 160 struct btrfs_leaf {
 161         struct btrfs_header header;
 162         struct btrfs_item items[];
 163 } __attribute__ ((__packed__));
 164
 165 /*
 166  * all non-leaf blocks are nodes, they hold only keys and pointers to
 167  * other blocks
 168  */
 169 struct btrfs_key_ptr {
 170         struct btrfs_disk_key key;
 171         __le64 blockptr;
 172         __le64 generation;
 173 } __attribute__ ((__packed__));
 174
 175 struct btrfs_node {
 176         struct btrfs_header header;
 177         struct btrfs_key_ptr ptrs[];
 178 } __attribute__ ((__packed__));
 179
 180 /*
 181  * btrfs_paths remember the path taken from the root down to the leaf.
 182  * level 0 is always the leaf, and nodes[1...BTRFS_MAX_LEVEL] will point
 183  * to any other levels that are present.
 184  *
 185  * The slots array records the index of the item or block pointer
 186  * used while walking the tree.
 187  */
 188 struct btrfs_path {
 189         struct extent_buffer *nodes[BTRFS_MAX_LEVEL];
 190         int slots[BTRFS_MAX_LEVEL];
 191         int reada;
 192         int lowest_level;
 193 };
 194
 195 /*
 196  * items in the extent btree are used to record the objectid of the
 197  * owner of the block and the number of references
 198  */
 199 struct btrfs_extent_item {
 200         __le32 refs;
 201 } __attribute__ ((__packed__));
 202
 203 struct btrfs_extent_ref {
 204         __le64 root;
 205         __le64 generation;
 206         __le64 objectid;
 207         __le64 offset;
 208 } __attribute__ ((__packed__));
 209
 210 struct btrfs_inode_ref {
 211         __le16 name_len;
 212         /* name goes here */
 213 } __attribute__ ((__packed__));
 214
 215 struct btrfs_inode_timespec {
 216         __le64 sec;
 217         __le32 nsec;
 218 } __attribute__ ((__packed__));
 219
 220 /*
 221  * there is no padding here on purpose.  If you want to extent the inode,
 222  * make a new item type
 223  */
 224 struct btrfs_inode_item {
 225         __le64 generation;
 226         __le64 size;
 227         __le64 nblocks;
 228         __le64 block_group;
 229         __le32 nlink;
 230         __le32 uid;
 231         __le32 gid;
 232         __le32 mode;
 233         __le32 rdev;
 234         __le16 flags;
 235         __le16 compat_flags;
 236         struct btrfs_inode_timespec atime;
 237         struct btrfs_inode_timespec ctime;
 238         struct btrfs_inode_timespec mtime;
 239         struct btrfs_inode_timespec otime;
 240 } __attribute__ ((__packed__));
 241
 242 struct btrfs_dir_item {
 243         struct btrfs_disk_key location;
 244         __le16 data_len;
 245         __le16 name_len;
 246         u8 type;
 247 } __attribute__ ((__packed__));
 248
 249 struct btrfs_root_item {
 250         struct btrfs_inode_item inode;
 251         __le64 root_dirid;
 252         __le64 bytenr;
 253         __le64 byte_limit;
 254         __le64 bytes_used;
 255         __le32 flags;
 256         __le32 refs;
 257         struct btrfs_disk_key drop_progress;
 258         u8 drop_level;
 259         u8 level;
 260 } __attribute__ ((__packed__));
 261
 262 #define BTRFS_FILE_EXTENT_REG 0
 263 #define BTRFS_FILE_EXTENT_INLINE 1
 264
 265 struct btrfs_file_extent_item {
 266         __le64 generation;
 267         u8 type;
 268         /*
 269          * disk space consumed by the extent, checksum blocks are included
 270          * in these numbers
 271          */
 272         __le64 disk_bytenr;
 273         __le64 disk_num_bytes;
 274         /*
 275          * the logical offset in file blocks (no csums)
 276          * this extent record is for.  This allows a file extent to point
 277          * into the middle of an existing extent on disk, sharing it
 278          * between two snapshots (useful if some bytes in the middle of the
 279          * extent have changed
 280          */
 281         __le64 offset;
 282         /*
 283          * the logical number of file blocks (no csums included)
 284          */
 285         __le64 num_bytes;
 286 } __attribute__ ((__packed__));
 287
 288 struct btrfs_csum_item {
 289         u8 csum;
 290 } __attribute__ ((__packed__));
 291
 292 /* tag for the radix tree of block groups in ram */
 293 #define BTRFS_BLOCK_GROUP_SIZE (256 * 1024 * 1024)
 294
 295
 296 #define BTRFS_BLOCK_GROUP_DATA 1
 297 #define BTRFS_BLOCK_GROUP_MIXED 2
 298
 299 struct btrfs_block_group_item {
 300         __le64 used;
 301         u8 flags;
 302 } __attribute__ ((__packed__));
 303
 304 struct btrfs_block_group_cache {
 305         struct btrfs_key key;
 306         struct btrfs_block_group_item item;
 307         int data;
 308         int cached;
 309         u64 pinned;
 310 };
 311 struct btrfs_fs_info {
 312         u8 fsid[BTRFS_FSID_SIZE];
 313         struct btrfs_root *extent_root;
 314         struct btrfs_root *tree_root;
 315         struct radix_tree_root fs_roots_radix;
 316
 317         struct extent_map_tree free_space_cache;
 318         struct extent_map_tree block_group_cache;
 319         struct extent_map_tree pinned_extents;
 320         struct extent_map_tree pending_del;
 321         struct extent_map_tree extent_ins;
 322
 323         u64 generation;
 324         u64 last_trans_committed;
 325         unsigned long mount_opt;
 326         u64 max_extent;
 327         struct btrfs_transaction *running_transaction;
 328         struct btrfs_super_block super_copy;
 329         struct extent_buffer *sb_buffer;
 330         struct super_block *sb;
 331         struct inode *btree_inode;
 332         spinlock_t hash_lock;
 333         struct mutex trans_mutex;
 334         struct mutex fs_mutex;
 335         struct list_head trans_list;
 336         struct list_head hashers;
 337         struct list_head dead_roots;
 338 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
 339         struct work_struct trans_work;
 340 #else
 341         struct delayed_work trans_work;
 342 #endif
 343         struct kobject super_kobj;
 344         struct completion kobj_unregister;
 345         int do_barriers;
 346         int closing;
 347
 348         u64 total_pinned;
 349 };
 350 /*
 351  * in ram representation of the tree.  extent_root is used for all allocations
 352  * and for the extent tree extent_root root.
 353  */
 354 struct btrfs_root {
 355         struct extent_buffer *node;
 356         struct extent_buffer *commit_root;
 357         struct btrfs_root_item root_item;
 358         struct btrfs_key root_key;
 359         struct btrfs_fs_info *fs_info;
 360         struct inode *inode;
 361         struct kobject root_kobj;
 362         struct completion kobj_unregister;
 363         struct rw_semaphore snap_sem;
 364         u64 objectid;
 365         u64 last_trans;
 366
 367         /* data allocations are done in sectorsize units */
 368         u32 sectorsize;
 369
 370         /* node allocations are done in nodesize units */
 371         u32 nodesize;
 372
 373         /* leaf allocations are done in leafsize units */
 374         u32 leafsize;
 375
 376         u32 stripesize;
 377
 378         u32 type;
 379         u64 highest_inode;
 380         u64 last_inode_alloc;
 381         int ref_cows;
 382         struct btrfs_key defrag_progress;
 383         int defrag_running;
 384         int defrag_level;
 385         char *name;
 386 };
 387
 388 /*
 389  * inode items have the data typically returned from stat and store other
 390  * info about object characteristics.  There is one for every file and dir in
 391  * the FS
 392  */
 393 #define BTRFS_INODE_ITEM_KEY            1
 394 #define BTRFS_INODE_REF_KEY             2
 395 #define BTRFS_XATTR_ITEM_KEY            8
 396 /* reserve 2-15 close to the inode for later flexibility */
 397
 398 /*
 399  * dir items are the name -> inode pointers in a directory.  There is one
 400  * for every name in a directory.
 401  */
 402 #define BTRFS_DIR_ITEM_KEY      16
 403 #define BTRFS_DIR_INDEX_KEY     17
 404 /*
 405  * extent data is for file data
 406  */
 407 #define BTRFS_EXTENT_DATA_KEY   18
 408 /*
 409  * csum items have the checksums for data in the extents
 410  */
 411 #define BTRFS_CSUM_ITEM_KEY     19
 412
 413 /* reserve 20-31 for other file stuff */
 414
 415 /*
 416  * root items point to tree roots.  There are typically in the root
 417  * tree used by the super block to find all the other trees
 418  */
 419 #define BTRFS_ROOT_ITEM_KEY     32
 420 /*
 421  * extent items are in the extent map tree.  These record which blocks
 422  * are used, and how many references there are to each block
 423  */
 424 #define BTRFS_EXTENT_ITEM_KEY   33
 425 #define BTRFS_EXTENT_REF_KEY    34
 426
 427 /*
 428  * block groups give us hints into the extent allocation trees.  Which
 429  * blocks are free etc etc
 430  */
 431 #define BTRFS_BLOCK_GROUP_ITEM_KEY 50
 432
 433 /*
 434  * string items are for debugging.  They just store a short string of
 435  * data in the FS
 436  */
 437 #define BTRFS_STRING_ITEM_KEY   253
 438
 439 #define BTRFS_MOUNT_NODATASUM           0x1
 440 #define BTRFS_MOUNT_NODATACOW           0x2
 441
 442 #define btrfs_clear_opt(o, opt)         ((o) &= ~BTRFS_MOUNT_##opt)
 443 #define btrfs_set_opt(o, opt)           ((o) |= BTRFS_MOUNT_##opt)
 444 #define btrfs_test_opt(root, opt)       ((root)->fs_info->mount_opt & \
 445                                          BTRFS_MOUNT_##opt)
 446
 447 /* some macros to generate set/get funcs for the struct fields.  This
 448  * assumes there is a lefoo_to_cpu for every type, so lets make a simple
 449  * one for u8:
 450  */
 451 #define le8_to_cpu(v) (v)
 452 #define cpu_to_le8(v) (v)
 453 #define __le8 u8
 454
 455 #define read_eb_member(eb, ptr, type, member, result) (                 \
 456         read_extent_buffer(eb, (char *)(result),                        \
 457                            ((unsigned long)(ptr)) +                     \
 458                             offsetof(type, member),                     \
 459                            sizeof(((type *)0)->member)))
 460
 461 #define write_eb_member(eb, ptr, type, member, result) (                \
 462         write_extent_buffer(eb, (char *)(result),                       \
 463                            ((unsigned long)(ptr)) +                     \
 464                             offsetof(type, member),                     \
 465                            sizeof(((type *)0)->member)))
 466
 467 #ifndef BTRFS_SETGET_FUNCS
 468 #define BTRFS_SETGET_FUNCS(name, type, member, bits)                    \
 469 u##bits btrfs_##name(struct extent_buffer *eb, type *s);                \
 470 void btrfs_set_##name(struct extent_buffer *eb, type *s, u##bits val);
 471 #endif
 472
 473 #define BTRFS_SETGET_HEADER_FUNCS(name, type, member, bits)             \
 474 static inline u##bits btrfs_##name(struct extent_buffer *eb)            \
 475 {                                                                       \
 476         char *kaddr = kmap_atomic(eb->first_page, KM_USER0);            \
 477         unsigned long offset = offsetof(type, member);                  \
 478         u##bits res;                                                    \
 479         __le##bits *tmp = (__le##bits *)(kaddr + offset);               \
 480         res = le##bits##_to_cpu(*tmp);                                  \
 481         kunmap_atomic(kaddr, KM_USER0);                                 \
 482         return res;                                                     \
 483 }                                                                       \
 484 static inline void btrfs_set_##name(struct extent_buffer *eb,           \
 485                                     u##bits val)                        \
 486 {                                                                       \
 487         char *kaddr = kmap_atomic(eb->first_page, KM_USER0);            \
 488         unsigned long offset = offsetof(type, member);                  \
 489         __le##bits *tmp = (__le##bits *)(kaddr + offset);               \
 490         *tmp = cpu_to_le##bits(val);                                    \
 491         kunmap_atomic(kaddr, KM_USER0);                                 \
 492 }
 493
 494 #define BTRFS_SETGET_STACK_FUNCS(name, type, member, bits)              \
 495 static inline u##bits btrfs_##name(type *s)                             \
 496 {                                                                       \
 497         return le##bits##_to_cpu(s->member);                            \
 498 }                                                                       \
 499 static inline void btrfs_set_##name(type *s, u##bits val)               \
 500 {                                                                       \
 501         s->member = cpu_to_le##bits(val);                               \
 502 }
 503
 504 /* struct btrfs_block_group_item */
 505 BTRFS_SETGET_STACK_FUNCS(block_group_used, struct btrfs_block_group_item,
 506                          used, 64);
 507 BTRFS_SETGET_FUNCS(disk_block_group_used, struct btrfs_block_group_item,
 508                          used, 64);
 509
 510 /* struct btrfs_inode_ref */
 511 BTRFS_SETGET_FUNCS(inode_ref_name_len, struct btrfs_inode_ref, name_len, 16);
 512
 513 /* struct btrfs_inode_item */
 514 BTRFS_SETGET_FUNCS(inode_generation, struct btrfs_inode_item, generation, 64);
 515 BTRFS_SETGET_FUNCS(inode_size, struct btrfs_inode_item, size, 64);
 516 BTRFS_SETGET_FUNCS(inode_nblocks, struct btrfs_inode_item, nblocks, 64);
 517 BTRFS_SETGET_FUNCS(inode_block_group, struct btrfs_inode_item, block_group, 64);
 518 BTRFS_SETGET_FUNCS(inode_nlink, struct btrfs_inode_item, nlink, 32);
 519 BTRFS_SETGET_FUNCS(inode_uid, struct btrfs_inode_item, uid, 32);
 520 BTRFS_SETGET_FUNCS(inode_gid, struct btrfs_inode_item, gid, 32);
 521 BTRFS_SETGET_FUNCS(inode_mode, struct btrfs_inode_item, mode, 32);
 522 BTRFS_SETGET_FUNCS(inode_rdev, struct btrfs_inode_item, rdev, 32);
 523 BTRFS_SETGET_FUNCS(inode_flags, struct btrfs_inode_item, flags, 16);
 524 BTRFS_SETGET_FUNCS(inode_compat_flags, struct btrfs_inode_item,
 525                    compat_flags, 16);
 526
 527 static inline struct btrfs_inode_timespec *
 528 btrfs_inode_atime(struct btrfs_inode_item *inode_item)
 529 {
 530         unsigned long ptr = (unsigned long)inode_item;
 531         ptr += offsetof(struct btrfs_inode_item, atime);
 532         return (struct btrfs_inode_timespec *)ptr;
 533 }
 534
 535 static inline struct btrfs_inode_timespec *
 536 btrfs_inode_mtime(struct btrfs_inode_item *inode_item)
 537 {
 538         unsigned long ptr = (unsigned long)inode_item;
 539         ptr += offsetof(struct btrfs_inode_item, mtime);
 540         return (struct btrfs_inode_timespec *)ptr;
 541 }
 542
 543 static inline struct btrfs_inode_timespec *
 544 btrfs_inode_ctime(struct btrfs_inode_item *inode_item)
 545 {
 546         unsigned long ptr = (unsigned long)inode_item;
 547         ptr += offsetof(struct btrfs_inode_item, ctime);
 548         return (struct btrfs_inode_timespec *)ptr;
 549 }
 550
 551 static inline struct btrfs_inode_timespec *
 552 btrfs_inode_otime(struct btrfs_inode_item *inode_item)
 553 {
 554         unsigned long ptr = (unsigned long)inode_item;
 555         ptr += offsetof(struct btrfs_inode_item, otime);
 556         return (struct btrfs_inode_timespec *)ptr;
 557 }
 558
 559 BTRFS_SETGET_FUNCS(timespec_sec, struct btrfs_inode_timespec, sec, 64);
 560 BTRFS_SETGET_FUNCS(timespec_nsec, struct btrfs_inode_timespec, nsec, 32);
 561
 562 /* struct btrfs_extent_item */
 563 BTRFS_SETGET_FUNCS(extent_refs, struct btrfs_extent_item, refs, 32);
 564
 565 /* struct btrfs_extent_ref */
 566 BTRFS_SETGET_FUNCS(ref_root, struct btrfs_extent_ref, root, 64);
 567 BTRFS_SETGET_FUNCS(ref_generation, struct btrfs_extent_ref, generation, 64);
 568 BTRFS_SETGET_FUNCS(ref_objectid, struct btrfs_extent_ref, objectid, 64);
 569 BTRFS_SETGET_FUNCS(ref_offset, struct btrfs_extent_ref, offset, 64);
 570
 571 BTRFS_SETGET_STACK_FUNCS(stack_ref_root, struct btrfs_extent_ref, root, 64);
 572 BTRFS_SETGET_STACK_FUNCS(stack_ref_generation, struct btrfs_extent_ref,
 573                          generation, 64);
 574 BTRFS_SETGET_STACK_FUNCS(stack_ref_objectid, struct btrfs_extent_ref,
 575                          objectid, 64);
 576 BTRFS_SETGET_STACK_FUNCS(stack_ref_offset, struct btrfs_extent_ref, offset, 64);
 577
 578 BTRFS_SETGET_STACK_FUNCS(stack_extent_refs, struct btrfs_extent_item,
 579                          refs, 32);
 580
 581 /* struct btrfs_node */
 582 BTRFS_SETGET_FUNCS(key_blockptr, struct btrfs_key_ptr, blockptr, 64);
 583 BTRFS_SETGET_FUNCS(key_generation, struct btrfs_key_ptr, generation, 64);
 584
 585 static inline u64 btrfs_node_blockptr(struct extent_buffer *eb, int nr)
 586 {
 587         unsigned long ptr;
 588         ptr = offsetof(struct btrfs_node, ptrs) +
 589                 sizeof(struct btrfs_key_ptr) * nr;
 590         return btrfs_key_blockptr(eb, (struct btrfs_key_ptr *)ptr);
 591 }
 592
 593 static inline void btrfs_set_node_blockptr(struct extent_buffer *eb,
 594                                            int nr, u64 val)
 595 {
 596         unsigned long ptr;
 597         ptr = offsetof(struct btrfs_node, ptrs) +
 598                 sizeof(struct btrfs_key_ptr) * nr;
 599         btrfs_set_key_blockptr(eb, (struct btrfs_key_ptr *)ptr, val);
 600 }
 601
 602 static inline u64 btrfs_node_ptr_generation(struct extent_buffer *eb, int nr)
 603 {
 604         unsigned long ptr;
 605         ptr = offsetof(struct btrfs_node, ptrs) +
 606                 sizeof(struct btrfs_key_ptr) * nr;
 607         return btrfs_key_generation(eb, (struct btrfs_key_ptr *)ptr);
 608 }
 609
 610 static inline void btrfs_set_node_ptr_generation(struct extent_buffer *eb,
 611                                                  int nr, u64 val)
 612 {
 613         unsigned long ptr;
 614         ptr = offsetof(struct btrfs_node, ptrs) +
 615                 sizeof(struct btrfs_key_ptr) * nr;
 616         btrfs_set_key_generation(eb, (struct btrfs_key_ptr *)ptr, val);
 617 }
 618
 619 static inline unsigned long btrfs_node_key_ptr_offset(int nr)
 620 {
 621         return offsetof(struct btrfs_node, ptrs) +
 622                 sizeof(struct btrfs_key_ptr) * nr;
 623 }
 624
 625 void btrfs_node_key(struct extent_buffer *eb,
 626                     struct btrfs_disk_key *disk_key, int nr);
 627
 628 static inline void btrfs_set_node_key(struct extent_buffer *eb,
 629                                       struct btrfs_disk_key *disk_key, int nr)
 630 {
 631         unsigned long ptr;
 632         ptr = btrfs_node_key_ptr_offset(nr);
 633         write_eb_member(eb, (struct btrfs_key_ptr *)ptr,
 634                        struct btrfs_key_ptr, key, disk_key);
 635 }
 636
 637 /* struct btrfs_item */
 638 BTRFS_SETGET_FUNCS(item_offset, struct btrfs_item, offset, 32);
 639 BTRFS_SETGET_FUNCS(item_size, struct btrfs_item, size, 32);
 640
 641 static inline unsigned long btrfs_item_nr_offset(int nr)
 642 {
 643         return offsetof(struct btrfs_leaf, items) +
 644                 sizeof(struct btrfs_item) * nr;
 645 }
 646
 647 static inline struct btrfs_item *btrfs_item_nr(struct extent_buffer *eb,
 648                                                int nr)
 649 {
 650         return (struct btrfs_item *)btrfs_item_nr_offset(nr);
 651 }
 652
 653 static inline u32 btrfs_item_end(struct extent_buffer *eb,
 654                                  struct btrfs_item *item)
 655 {
 656         return btrfs_item_offset(eb, item) + btrfs_item_size(eb, item);
 657 }
 658
 659 static inline u32 btrfs_item_end_nr(struct extent_buffer *eb, int nr)
 660 {
 661         return btrfs_item_end(eb, btrfs_item_nr(eb, nr));
 662 }
 663
 664 static inline u32 btrfs_item_offset_nr(struct extent_buffer *eb, int nr)
 665 {
 666         return btrfs_item_offset(eb, btrfs_item_nr(eb, nr));
 667 }
 668
 669 static inline u32 btrfs_item_size_nr(struct extent_buffer *eb, int nr)
 670 {
 671         return btrfs_item_size(eb, btrfs_item_nr(eb, nr));
 672 }
 673
 674 static inline void btrfs_item_key(struct extent_buffer *eb,
 675                            struct btrfs_disk_key *disk_key, int nr)
 676 {
 677         struct btrfs_item *item = btrfs_item_nr(eb, nr);
 678         read_eb_member(eb, item, struct btrfs_item, key, disk_key);
 679 }
 680
 681 static inline void btrfs_set_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         write_eb_member(eb, item, struct btrfs_item, key, disk_key);
 686 }
 687
 688 /* struct btrfs_dir_item */
 689 BTRFS_SETGET_FUNCS(dir_data_len, struct btrfs_dir_item, data_len, 16);
 690 BTRFS_SETGET_FUNCS(dir_type, struct btrfs_dir_item, type, 8);
 691 BTRFS_SETGET_FUNCS(dir_name_len, struct btrfs_dir_item, name_len, 16);
 692
 693 static inline void btrfs_dir_item_key(struct extent_buffer *eb,
 694                                       struct btrfs_dir_item *item,
 695                                       struct btrfs_disk_key *key)
 696 {
 697         read_eb_member(eb, item, struct btrfs_dir_item, location, key);
 698 }
 699
 700 static inline void btrfs_set_dir_item_key(struct extent_buffer *eb,
 701                                           struct btrfs_dir_item *item,
 702                                           struct btrfs_disk_key *key)
 703 {
 704         write_eb_member(eb, item, struct btrfs_dir_item, location, key);
 705 }
 706
 707 /* struct btrfs_disk_key */
 708 BTRFS_SETGET_STACK_FUNCS(disk_key_objectid, struct btrfs_disk_key,
 709                          objectid, 64);
 710 BTRFS_SETGET_STACK_FUNCS(disk_key_offset, struct btrfs_disk_key, offset, 64);
 711 BTRFS_SETGET_STACK_FUNCS(disk_key_type, struct btrfs_disk_key, type, 8);
 712
 713 static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu,
 714                                          struct btrfs_disk_key *disk)
 715 {
 716         cpu->offset = le64_to_cpu(disk->offset);
 717         cpu->type = disk->type;
 718         cpu->objectid = le64_to_cpu(disk->objectid);
 719 }
 720
 721 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk,
 722                                          struct btrfs_key *cpu)
 723 {
 724         disk->offset = cpu_to_le64(cpu->offset);
 725         disk->type = cpu->type;
 726         disk->objectid = cpu_to_le64(cpu->objectid);
 727 }
 728
 729 static inline void btrfs_node_key_to_cpu(struct extent_buffer *eb,
 730                                   struct btrfs_key *key, int nr)
 731 {
 732         struct btrfs_disk_key disk_key;
 733         btrfs_node_key(eb, &disk_key, nr);
 734         btrfs_disk_key_to_cpu(key, &disk_key);
 735 }
 736
 737 static inline void btrfs_item_key_to_cpu(struct extent_buffer *eb,
 738                                   struct btrfs_key *key, int nr)
 739 {
 740         struct btrfs_disk_key disk_key;
 741         btrfs_item_key(eb, &disk_key, nr);
 742         btrfs_disk_key_to_cpu(key, &disk_key);
 743 }
 744
 745 static inline void btrfs_dir_item_key_to_cpu(struct extent_buffer *eb,
 746                                       struct btrfs_dir_item *item,
 747                                       struct btrfs_key *key)
 748 {
 749         struct btrfs_disk_key disk_key;
 750         btrfs_dir_item_key(eb, item, &disk_key);
 751         btrfs_disk_key_to_cpu(key, &disk_key);
 752 }
 753
 754
 755 static inline u8 btrfs_key_type(struct btrfs_key *key)
 756 {
 757         return key->type;
 758 }
 759
 760 static inline void btrfs_set_key_type(struct btrfs_key *key, u8 val)
 761 {
 762         key->type = val;
 763 }
 764
 765 /* struct btrfs_header */
 766 BTRFS_SETGET_HEADER_FUNCS(header_bytenr, struct btrfs_header, bytenr, 64);
 767 BTRFS_SETGET_HEADER_FUNCS(header_generation, struct btrfs_header,
 768                           generation, 64);
 769 BTRFS_SETGET_HEADER_FUNCS(header_owner, struct btrfs_header, owner, 64);
 770 BTRFS_SETGET_HEADER_FUNCS(header_nritems, struct btrfs_header, nritems, 32);
 771 BTRFS_SETGET_HEADER_FUNCS(header_flags, struct btrfs_header, flags, 16);
 772 BTRFS_SETGET_HEADER_FUNCS(header_level, struct btrfs_header, level, 8);
 773
 774 static inline u8 *btrfs_header_fsid(struct extent_buffer *eb)
 775 {
 776         unsigned long ptr = offsetof(struct btrfs_header, fsid);
 777         return (u8 *)ptr;
 778 }
 779
 780 static inline u8 *btrfs_super_fsid(struct extent_buffer *eb)
 781 {
 782         unsigned long ptr = offsetof(struct btrfs_super_block, fsid);
 783         return (u8 *)ptr;
 784 }
 785
 786 static inline u8 *btrfs_header_csum(struct extent_buffer *eb)
 787 {
 788         unsigned long ptr = offsetof(struct btrfs_header, csum);
 789         return (u8 *)ptr;
 790 }
 791
 792 static inline struct btrfs_node *btrfs_buffer_node(struct extent_buffer *eb)
 793 {
 794         return NULL;
 795 }
 796
 797 static inline struct btrfs_leaf *btrfs_buffer_leaf(struct extent_buffer *eb)
 798 {
 799         return NULL;
 800 }
 801
 802 static inline struct btrfs_header *btrfs_buffer_header(struct extent_buffer *eb)
 803 {
 804         return NULL;
 805 }
 806
 807 static inline int btrfs_is_leaf(struct extent_buffer *eb)
 808 {
 809         return (btrfs_header_level(eb) == 0);
 810 }
 811
 812 /* struct btrfs_root_item */
 813 BTRFS_SETGET_FUNCS(disk_root_refs, struct btrfs_root_item, refs, 32);
 814 BTRFS_SETGET_FUNCS(disk_root_bytenr, struct btrfs_root_item, bytenr, 64);
 815 BTRFS_SETGET_FUNCS(disk_root_level, struct btrfs_root_item, level, 8);
 816
 817 BTRFS_SETGET_STACK_FUNCS(root_bytenr, struct btrfs_root_item, bytenr, 64);
 818 BTRFS_SETGET_STACK_FUNCS(root_level, struct btrfs_root_item, level, 8);
 819 BTRFS_SETGET_STACK_FUNCS(root_dirid, struct btrfs_root_item, root_dirid, 64);
 820 BTRFS_SETGET_STACK_FUNCS(root_refs, struct btrfs_root_item, refs, 32);
 821 BTRFS_SETGET_STACK_FUNCS(root_flags, struct btrfs_root_item, flags, 32);
 822 BTRFS_SETGET_STACK_FUNCS(root_used, struct btrfs_root_item, bytes_used, 64);
 823 BTRFS_SETGET_STACK_FUNCS(root_limit, struct btrfs_root_item, byte_limit, 64);
 824
 825 /* struct btrfs_super_block */
 826 BTRFS_SETGET_STACK_FUNCS(super_bytenr, struct btrfs_super_block, bytenr, 64);
 827 BTRFS_SETGET_STACK_FUNCS(super_generation, struct btrfs_super_block,
 828                          generation, 64);
 829 BTRFS_SETGET_STACK_FUNCS(super_root, struct btrfs_super_block, root, 64);
 830 BTRFS_SETGET_STACK_FUNCS(super_root_level, struct btrfs_super_block,
 831                          root_level, 8);
 832 BTRFS_SETGET_STACK_FUNCS(super_total_bytes, struct btrfs_super_block,
 833                          total_bytes, 64);
 834 BTRFS_SETGET_STACK_FUNCS(super_bytes_used, struct btrfs_super_block,
 835                          bytes_used, 64);
 836 BTRFS_SETGET_STACK_FUNCS(super_sectorsize, struct btrfs_super_block,
 837                          sectorsize, 32);
 838 BTRFS_SETGET_STACK_FUNCS(super_nodesize, struct btrfs_super_block,
 839                          nodesize, 32);
 840 BTRFS_SETGET_STACK_FUNCS(super_leafsize, struct btrfs_super_block,
 841                          leafsize, 32);
 842 BTRFS_SETGET_STACK_FUNCS(super_stripesize, struct btrfs_super_block,
 843                          stripesize, 32);
 844 BTRFS_SETGET_STACK_FUNCS(super_root_dir, struct btrfs_super_block,
 845                          root_dir_objectid, 64);
 846
 847 static inline unsigned long btrfs_leaf_data(struct extent_buffer *l)
 848 {
 849         return offsetof(struct btrfs_leaf, items);
 850 }
 851
 852 /* struct btrfs_file_extent_item */
 853 BTRFS_SETGET_FUNCS(file_extent_type, struct btrfs_file_extent_item, type, 8);
 854
 855 static inline unsigned long btrfs_file_extent_inline_start(struct
 856                                                    btrfs_file_extent_item *e)
 857 {
 858         unsigned long offset = (unsigned long)e;
 859         offset += offsetof(struct btrfs_file_extent_item, disk_bytenr);
 860         return offset;
 861 }
 862
 863 static inline u32 btrfs_file_extent_calc_inline_size(u32 datasize)
 864 {
 865         return offsetof(struct btrfs_file_extent_item, disk_bytenr) + datasize;
 866 }
 867
 868 static inline u32 btrfs_file_extent_inline_len(struct extent_buffer *eb,
 869                                                struct btrfs_item *e)
 870 {
 871         unsigned long offset;
 872         offset = offsetof(struct btrfs_file_extent_item, disk_bytenr);
 873         return btrfs_item_size(eb, e) - offset;
 874 }
 875
 876 BTRFS_SETGET_FUNCS(file_extent_disk_bytenr, struct btrfs_file_extent_item,
 877                    disk_bytenr, 64);
 878 BTRFS_SETGET_FUNCS(file_extent_generation, struct btrfs_file_extent_item,
 879                    generation, 64);
 880 BTRFS_SETGET_FUNCS(file_extent_disk_num_bytes, struct btrfs_file_extent_item,
 881                    disk_num_bytes, 64);
 882 BTRFS_SETGET_FUNCS(file_extent_offset, struct btrfs_file_extent_item,
 883                   offset, 64);
 884 BTRFS_SETGET_FUNCS(file_extent_num_bytes, struct btrfs_file_extent_item,
 885                    num_bytes, 64);
 886
 887 static inline struct btrfs_root *btrfs_sb(struct super_block *sb)
 888 {
 889         return sb->s_fs_info;
 890 }
 891
 892 static inline int btrfs_set_root_name(struct btrfs_root *root,
 893                                       const char *name, int len)
 894 {
 895         /* if we already have a name just free it */
 896         if (root->name)
 897                 kfree(root->name);
 898
 899         root->name = kmalloc(len+1, GFP_KERNEL);
 900         if (!root->name)
 901                 return -ENOMEM;
 902
 903         memcpy(root->name, name, len);
 904         root->name[len] ='\0';
 905
 906         return 0;
 907 }
 908
 909 static inline u32 btrfs_level_size(struct btrfs_root *root, int level) {
 910         if (level == 0)
 911                 return root->leafsize;
 912         return root->nodesize;
 913 }
 914
 915 /* helper function to cast into the data area of the leaf. */
 916 #define btrfs_item_ptr(leaf, slot, type) \
 917         ((type *)(btrfs_leaf_data(leaf) + \
 918         btrfs_item_offset_nr(leaf, slot)))
 919
 920 #define btrfs_item_ptr_offset(leaf, slot) \
 921         ((unsigned long)(btrfs_leaf_data(leaf) + \
 922         btrfs_item_offset_nr(leaf, slot)))
 923
 924 static inline struct dentry *fdentry(struct file *file) {
 925 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
 926         return file->f_dentry;
 927 #else
 928         return file->f_path.dentry;
 929 #endif
 930 }
 931
 932 /* extent-tree.c */
 933 u32 btrfs_count_snapshots_in_path(struct btrfs_root *root,
 934                                   struct btrfs_path *count_path,
 935                                   u64 first_extent);
 936 int btrfs_extent_post_op(struct btrfs_trans_handle *trans,
 937                          struct btrfs_root *root);
 938 int btrfs_copy_pinned(struct btrfs_root *root, struct extent_map_tree *copy);
 939 struct btrfs_block_group_cache *btrfs_lookup_block_group(struct
 940                                                          btrfs_fs_info *info,
 941                                                          u64 bytenr);
 942 struct btrfs_block_group_cache *btrfs_find_block_group(struct btrfs_root *root,
 943                                                  struct btrfs_block_group_cache
 944                                                  *hint, u64 search_start,
 945                                                  int data, int owner);
 946 int btrfs_inc_root_ref(struct btrfs_trans_handle *trans,
 947                        struct btrfs_root *root, u64 owner_objectid);
 948 struct extent_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
 949                                             struct btrfs_root *root, u32 size,
 950                                             u64 root_objectid,
 951                                             u64 hint, u64 empty_size);
 952 struct extent_buffer *__btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
 953                                              struct btrfs_root *root,
 954                                              u32 blocksize,
 955                                              u64 root_objectid,
 956                                              u64 ref_generation,
 957                                              u64 first_objectid,
 958                                              int level,
 959                                              u64 hint,
 960                                              u64 empty_size);
 961 int btrfs_insert_extent_backref(struct btrfs_trans_handle *trans,
 962                                  struct btrfs_root *root,
 963                                  struct btrfs_path *path, u64 bytenr,
 964                                  u64 root_objectid, u64 ref_generation,
 965                                  u64 owner, u64 owner_offset);
 966 int btrfs_alloc_extent(struct btrfs_trans_handle *trans,
 967                        struct btrfs_root *root,
 968                        u64 num_bytes, u64 root_objectid, u64 ref_generation,
 969                        u64 owner, u64 owner_offset,
 970                        u64 empty_size, u64 hint_byte,
 971                        u64 search_end, struct btrfs_key *ins, int data);
 972 int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
 973                   struct extent_buffer *buf);
 974 int btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
 975                       *root, u64 bytenr, u64 num_bytes,
 976                       u64 root_objectid, u64 ref_generation,
 977                       u64 owner_objectid, u64 owner_offset, int pin);
 978 int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans,
 979                                struct btrfs_root *root,
 980                                struct extent_map_tree *unpin);
 981 int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
 982                                 struct btrfs_root *root,
 983                                 u64 bytenr, u64 num_bytes,
 984                                 u64 root_objectid, u64 ref_generation,
 985                                 u64 owner, u64 owner_offset);
 986 int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans,
 987                                     struct btrfs_root *root);
 988 int btrfs_free_block_groups(struct btrfs_fs_info *info);
 989 int btrfs_read_block_groups(struct btrfs_root *root);
 990 /* ctree.c */
 991 int btrfs_cow_block(struct btrfs_trans_handle *trans,
 992                     struct btrfs_root *root, struct extent_buffer *buf,
 993                     struct extent_buffer *parent, int parent_slot,
 994                     struct extent_buffer **cow_ret);
 995 int btrfs_copy_root(struct btrfs_trans_handle *trans,
 996                       struct btrfs_root *root,
 997                       struct extent_buffer *buf,
 998                       struct extent_buffer **cow_ret, u64 new_root_objectid);
 999 int btrfs_extend_item(struct btrfs_trans_handle *trans, struct btrfs_root
1000                       *root, struct btrfs_path *path, u32 data_size);
1001 int btrfs_truncate_item(struct btrfs_trans_handle *trans,
1002                         struct btrfs_root *root,
1003                         struct btrfs_path *path,
1004                         u32 new_size, int from_end);
1005 int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root
1006                       *root, struct btrfs_key *key, struct btrfs_path *p, int
1007                       ins_len, int cow);
1008 int btrfs_realloc_node(struct btrfs_trans_handle *trans,
1009                        struct btrfs_root *root, struct extent_buffer *parent,
1010                        int start_slot, int cache_only, u64 *last_ret,
1011                        struct btrfs_key *progress);
1012 void btrfs_release_path(struct btrfs_root *root, struct btrfs_path *p);
1013 struct btrfs_path *btrfs_alloc_path(void);
1014 void btrfs_free_path(struct btrfs_path *p);
1015 void btrfs_init_path(struct btrfs_path *p);
1016 int btrfs_del_item(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1017                    struct btrfs_path *path);
1018 int btrfs_insert_item(struct btrfs_trans_handle *trans, struct btrfs_root
1019                       *root, struct btrfs_key *key, void *data, u32 data_size);
1020 int btrfs_insert_empty_item(struct btrfs_trans_handle *trans, struct btrfs_root
1021                             *root, struct btrfs_path *path, struct btrfs_key
1022                             *cpu_key, u32 data_size);
1023 int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path);
1024 int btrfs_prev_leaf(struct btrfs_root *root, struct btrfs_path *path);
1025 int btrfs_leaf_free_space(struct btrfs_root *root, struct extent_buffer *leaf);
1026 int btrfs_drop_snapshot(struct btrfs_trans_handle *trans, struct btrfs_root
1027                         *root);
1028 /* root-item.c */
1029 int btrfs_del_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1030                    struct btrfs_key *key);
1031 int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root
1032                       *root, struct btrfs_key *key, struct btrfs_root_item
1033                       *item);
1034 int btrfs_update_root(struct btrfs_trans_handle *trans, struct btrfs_root
1035                       *root, struct btrfs_key *key, struct btrfs_root_item
1036                       *item);
1037 int btrfs_find_last_root(struct btrfs_root *root, u64 objectid, struct
1038                          btrfs_root_item *item, struct btrfs_key *key);
1039 int btrfs_find_dead_roots(struct btrfs_root *root, u64 objectid,
1040                           struct btrfs_root *latest_root);
1041 /* dir-item.c */
1042 int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
1043                           *root, const char *name, int name_len, u64 dir,
1044                           struct btrfs_key *location, u8 type);
1045 struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans,
1046                                              struct btrfs_root *root,
1047                                              struct btrfs_path *path, u64 dir,
1048                                              const char *name, int name_len,
1049                                              int mod);
1050 struct btrfs_dir_item *
1051 btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans,
1052                             struct btrfs_root *root,
1053                             struct btrfs_path *path, u64 dir,
1054                             u64 objectid, const char *name, int name_len,
1055                             int mod);
1056 struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_root *root,
1057                               struct btrfs_path *path,
1058                               const char *name, int name_len);
1059 int btrfs_delete_one_dir_name(struct btrfs_trans_handle *trans,
1060                               struct btrfs_root *root,
1061                               struct btrfs_path *path,
1062                               struct btrfs_dir_item *di);
1063 int btrfs_insert_xattr_item(struct btrfs_trans_handle *trans,
1064                             struct btrfs_root *root, const char *name,
1065                             u16 name_len, const void *data, u16 data_len,
1066                             u64 dir);
1067 struct btrfs_dir_item *btrfs_lookup_xattr(struct btrfs_trans_handle *trans,
1068                                           struct btrfs_root *root,
1069                                           struct btrfs_path *path, u64 dir,
1070                                           const char *name, u16 name_len,
1071                                           int mod);
1072 /* inode-map.c */
1073 int btrfs_find_free_objectid(struct btrfs_trans_handle *trans,
1074                              struct btrfs_root *fs_root,
1075                              u64 dirid, u64 *objectid);
1076 int btrfs_find_highest_inode(struct btrfs_root *fs_root, u64 *objectid);
1077
1078 /* inode-item.c */
1079 int btrfs_insert_inode_ref(struct btrfs_trans_handle *trans,
1080                            struct btrfs_root *root,
1081                            const char *name, int name_len,
1082                            u64 inode_objectid, u64 ref_objectid);
1083 int btrfs_del_inode_ref(struct btrfs_trans_handle *trans,
1084                            struct btrfs_root *root,
1085                            const char *name, int name_len,
1086                            u64 inode_objectid, u64 ref_objectid);
1087 int btrfs_insert_empty_inode(struct btrfs_trans_handle *trans,
1088                              struct btrfs_root *root,
1089                              struct btrfs_path *path, u64 objectid);
1090 int btrfs_lookup_inode(struct btrfs_trans_handle *trans, struct btrfs_root
1091                        *root, struct btrfs_path *path,
1092                        struct btrfs_key *location, int mod);
1093
1094 /* file-item.c */
1095 int btrfs_insert_file_extent(struct btrfs_trans_handle *trans,
1096                                struct btrfs_root *root,
1097                                u64 objectid, u64 pos, u64 offset,
1098                                u64 disk_num_bytes,
1099                                u64 num_bytes);
1100 int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
1101                              struct btrfs_root *root,
1102                              struct btrfs_path *path, u64 objectid,
1103                              u64 bytenr, int mod);
1104 int btrfs_csum_file_block(struct btrfs_trans_handle *trans,
1105                           struct btrfs_root *root,
1106                           struct inode *inode,
1107                           u64 objectid, u64 offset,
1108                           char *data, size_t len);
1109 struct btrfs_csum_item *btrfs_lookup_csum(struct btrfs_trans_handle *trans,
1110                                           struct btrfs_root *root,
1111                                           struct btrfs_path *path,
1112                                           u64 objectid, u64 offset,
1113                                           int cow);
1114 int btrfs_csum_truncate(struct btrfs_trans_handle *trans,
1115                         struct btrfs_root *root, struct btrfs_path *path,
1116                         u64 isize);
1117 /* inode.c */
1118 int btrfs_page_mkwrite(struct vm_area_struct *vma, struct page *page);
1119 int btrfs_readpage(struct file *file, struct page *page);
1120 void btrfs_delete_inode(struct inode *inode);
1121 void btrfs_read_locked_inode(struct inode *inode);
1122 int btrfs_write_inode(struct inode *inode, int wait);
1123 void btrfs_dirty_inode(struct inode *inode);
1124 struct inode *btrfs_alloc_inode(struct super_block *sb);
1125 void btrfs_destroy_inode(struct inode *inode);
1126 int btrfs_init_cachep(void);
1127 void btrfs_destroy_cachep(void);
1128 long btrfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
1129 struct inode *btrfs_iget_locked(struct super_block *s, u64 objectid,
1130                                 struct btrfs_root *root);
1131 int btrfs_commit_write(struct file *file, struct page *page,
1132                        unsigned from, unsigned to);
1133 struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page,
1134                                     size_t page_offset, u64 start, u64 end,
1135                                     int create);
1136 int btrfs_update_inode(struct btrfs_trans_handle *trans,
1137                               struct btrfs_root *root,
1138                               struct inode *inode);
1139 /* file.c */
1140 int btrfs_drop_extent_cache(struct inode *inode, u64 start, u64 end);
1141 extern struct file_operations btrfs_file_operations;
1142 int btrfs_drop_extents(struct btrfs_trans_handle *trans,
1143                        struct btrfs_root *root, struct inode *inode,
1144                        u64 start, u64 end, u64 inline_limit, u64 *hint_block);
1145 /* tree-defrag.c */
1146 int btrfs_defrag_leaves(struct btrfs_trans_handle *trans,
1147                         struct btrfs_root *root, int cache_only);
1148
1149 /* sysfs.c */
1150 int btrfs_init_sysfs(void);
1151 void btrfs_exit_sysfs(void);
1152 int btrfs_sysfs_add_super(struct btrfs_fs_info *fs);
1153 int btrfs_sysfs_add_root(struct btrfs_root *root);
1154 void btrfs_sysfs_del_root(struct btrfs_root *root);
1155 void btrfs_sysfs_del_super(struct btrfs_fs_info *root);
1156
1157 /* xattr.c */
1158 ssize_t btrfs_listxattr(struct dentry *dentry, char *buffer, size_t size);
1159 int btrfs_delete_xattrs(struct btrfs_trans_handle *trans,
1160                         struct btrfs_root *root, struct inode *inode);
1161 #endif