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