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_CTREE__
  20 #define __BTRFS_CTREE__
  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_io.h"
  31 #include "extent_map.h"
  32
  33 struct btrfs_trans_handle;
  34 struct btrfs_transaction;
  35 extern struct kmem_cache *btrfs_trans_handle_cachep;
  36 extern struct kmem_cache *btrfs_transaction_cachep;
  37 extern struct kmem_cache *btrfs_bit_radix_cachep;
  38 extern struct kmem_cache *btrfs_path_cachep;
  39
  40 #define BTRFS_MAGIC "_B3RfS_M"
  41
  42 #define BTRFS_MAX_LEVEL 8
  43 #define BTRFS_ROOT_TREE_OBJECTID 1ULL
  44 #define BTRFS_EXTENT_TREE_OBJECTID 2ULL
  45 #define BTRFS_FS_TREE_OBJECTID 3ULL
  46 #define BTRFS_ROOT_TREE_DIR_OBJECTID 4ULL
  47 #define BTRFS_FIRST_FREE_OBJECTID 256ULL
  48
  49 /*
  50  * we can actually store much bigger names, but lets not confuse the rest
  51  * of linux
  52  */
  53 #define BTRFS_NAME_LEN 255
  54
  55 /* 32 bytes in various csum fields */
  56 #define BTRFS_CSUM_SIZE 32
  57 /* four bytes for CRC32 */
  58 #define BTRFS_CRC32_SIZE 4
  59 #define BTRFS_EMPTY_DIR_SIZE 0
  60
  61 #define BTRFS_FT_UNKNOWN        0
  62 #define BTRFS_FT_REG_FILE       1
  63 #define BTRFS_FT_DIR            2
  64 #define BTRFS_FT_CHRDEV         3
  65 #define BTRFS_FT_BLKDEV         4
  66 #define BTRFS_FT_FIFO           5
  67 #define BTRFS_FT_SOCK           6
  68 #define BTRFS_FT_SYMLINK        7
  69 #define BTRFS_FT_XATTR          8
  70 #define BTRFS_FT_MAX            9
  71
  72 /*
  73  * the key defines the order in the tree, and so it also defines (optimal)
  74  * block layout.  objectid corresonds to the inode number.  The flags
  75  * tells us things about the object, and is a kind of stream selector.
  76  * so for a given inode, keys with flags of 1 might refer to the inode
  77  * data, flags of 2 may point to file data in the btree and flags == 3
  78  * may point to extents.
  79  *
  80  * offset is the starting byte offset for this key in the stream.
  81  *
  82  * btrfs_disk_key is in disk byte order.  struct btrfs_key is always
  83  * in cpu native order.  Otherwise they are identical and their sizes
  84  * should be the same (ie both packed)
  85  */
  86 struct btrfs_disk_key {
  87         __le64 objectid;
  88         u8 type;
  89         __le64 offset;
  90 } __attribute__ ((__packed__));
  91
  92 struct btrfs_key {
  93         u64 objectid;
  94         u8 type;
  95         u64 offset;
  96 } __attribute__ ((__packed__));
  97
  98 #define BTRFS_FSID_SIZE 16
  99 /*
 100  * every tree block (leaf or node) starts with this header.
 101  */
 102 struct btrfs_header {
 103         u8 csum[BTRFS_CSUM_SIZE];
 104         u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
 105         __le64 bytenr; /* which block this node is supposed to live in */
 106         __le64 generation;
 107         __le64 owner;
 108         __le32 nritems;
 109         __le16 flags;
 110         u8 level;
 111 } __attribute__ ((__packed__));
 112
 113 #define BTRFS_NODEPTRS_PER_BLOCK(r) (((r)->nodesize - \
 114                                 sizeof(struct btrfs_header)) / \
 115                                 sizeof(struct btrfs_key_ptr))
 116 #define __BTRFS_LEAF_DATA_SIZE(bs) ((bs) - sizeof(struct btrfs_header))
 117 #define BTRFS_LEAF_DATA_SIZE(r) (__BTRFS_LEAF_DATA_SIZE(r->leafsize))
 118 #define BTRFS_MAX_INLINE_DATA_SIZE(r) (BTRFS_LEAF_DATA_SIZE(r) - \
 119                                         sizeof(struct btrfs_item) - \
 120                                         sizeof(struct btrfs_file_extent_item))
 121
 122 /*
 123  * the super block basically lists the main trees of the FS
 124  * it currently lacks any block count etc etc
 125  */
 126 struct btrfs_super_block {
 127         u8 csum[BTRFS_CSUM_SIZE];
 128         /* the first 3 fields must match struct btrfs_header */
 129         u8 fsid[16];    /* FS specific uuid */
 130         __le64 bytenr; /* this block number */
 131         __le64 magic;
 132         __le64 generation;
 133         __le64 root;
 134         __le64 total_bytes;
 135         __le64 bytes_used;
 136         __le64 root_dir_objectid;
 137         __le32 sectorsize;
 138         __le32 nodesize;
 139         __le32 leafsize;
 140         __le32 stripesize;
 141         u8 root_level;
 142 } __attribute__ ((__packed__));
 143
 144 /*
 145  * A leaf is full of items. offset and size tell us where to find
 146  * the item in the leaf (relative to the start of the data area)
 147  */
 148 struct btrfs_item {
 149         struct btrfs_disk_key key;
 150         __le32 offset;
 151         __le32 size;
 152 } __attribute__ ((__packed__));
 153
 154 /*
 155  * leaves have an item area and a data area:
 156  * [item0, item1....itemN] [free space] [dataN...data1, data0]
 157  *
 158  * The data is separate from the items to get the keys closer together
 159  * during searches.
 160  */
 161 struct btrfs_leaf {
 162         struct btrfs_header header;
 163         struct btrfs_item items[];
 164 } __attribute__ ((__packed__));
 165
 166 /*
 167  * all non-leaf blocks are nodes, they hold only keys and pointers to
 168  * other blocks
 169  */
 170 struct btrfs_key_ptr {
 171         struct btrfs_disk_key key;
 172         __le64 blockptr;
 173         __le64 generation;
 174 } __attribute__ ((__packed__));
 175
 176 struct btrfs_node {
 177         struct btrfs_header header;
 178         struct btrfs_key_ptr ptrs[];
 179 } __attribute__ ((__packed__));
 180
 181 /*
 182  * btrfs_paths remember the path taken from the root down to the leaf.
 183  * level 0 is always the leaf, and nodes[1...BTRFS_MAX_LEVEL] will point
 184  * to any other levels that are present.
 185  *
 186  * The slots array records the index of the item or block pointer
 187  * used while walking the tree.
 188  */
 189 struct btrfs_path {
 190         struct extent_buffer *nodes[BTRFS_MAX_LEVEL];
 191         int slots[BTRFS_MAX_LEVEL];
 192         int reada;
 193         int lowest_level;
 194 };
 195
 196 /*
 197  * items in the extent btree are used to record the objectid of the
 198  * owner of the block and the number of references
 199  */
 200 struct btrfs_extent_item {
 201         __le32 refs;
 202 } __attribute__ ((__packed__));
 203
 204 struct btrfs_extent_ref {
 205         __le64 root;
 206         __le64 generation;
 207         __le64 objectid;
 208         __le64 offset;
 209 } __attribute__ ((__packed__));
 210
 211 struct btrfs_inode_ref {
 212         __le16 name_len;
 213         /* name goes here */
 214 } __attribute__ ((__packed__));
 215
 216 struct btrfs_inode_timespec {
 217         __le64 sec;
 218         __le32 nsec;
 219 } __attribute__ ((__packed__));
 220
 221 /*
 222  * there is no padding here on purpose.  If you want to extent the inode,
 223  * make a new item type
 224  */
 225 struct btrfs_inode_item {
 226         __le64 generation;
 227         __le64 size;
 228         __le64 nblocks;
 229         __le64 block_group;
 230         __le32 nlink;
 231         __le32 uid;
 232         __le32 gid;
 233         __le32 mode;
 234         __le32 rdev;
 235         __le16 flags;
 236         __le16 compat_flags;
 237         struct btrfs_inode_timespec atime;
 238         struct btrfs_inode_timespec ctime;
 239         struct btrfs_inode_timespec mtime;
 240         struct btrfs_inode_timespec otime;
 241 } __attribute__ ((__packed__));
 242
 243 struct btrfs_dir_item {
 244         struct btrfs_disk_key location;
 245         __le16 data_len;
 246         __le16 name_len;
 247         u8 type;
 248 } __attribute__ ((__packed__));
 249
 250 struct btrfs_root_item {
 251         struct btrfs_inode_item inode;
 252         __le64 root_dirid;
 253         __le64 bytenr;
 254         __le64 byte_limit;
 255         __le64 bytes_used;
 256         __le32 flags;
 257         __le32 refs;
 258         struct btrfs_disk_key drop_progress;
 259         u8 drop_level;
 260         u8 level;
 261 } __attribute__ ((__packed__));
 262
 263 #define BTRFS_FILE_EXTENT_REG 0
 264 #define BTRFS_FILE_EXTENT_INLINE 1
 265
 266 struct btrfs_file_extent_item {
 267         __le64 generation;
 268         u8 type;
 269         /*
 270          * disk space consumed by the extent, checksum blocks are included
 271          * in these numbers
 272          */
 273         __le64 disk_bytenr;
 274         __le64 disk_num_bytes;
 275         /*
 276          * the logical offset in file blocks (no csums)
 277          * this extent record is for.  This allows a file extent to point
 278          * into the middle of an existing extent on disk, sharing it
 279          * between two snapshots (useful if some bytes in the middle of the
 280          * extent have changed
 281          */
 282         __le64 offset;
 283         /*
 284          * the logical number of file blocks (no csums included)
 285          */
 286         __le64 num_bytes;
 287 } __attribute__ ((__packed__));
 288
 289 struct btrfs_csum_item {
 290         u8 csum;
 291 } __attribute__ ((__packed__));
 292
 293 /* tag for the radix tree of block groups in ram */
 294 #define BTRFS_BLOCK_GROUP_SIZE (256 * 1024 * 1024)
 295
 296
 297 #define BTRFS_BLOCK_GROUP_DATA 1
 298 #define BTRFS_BLOCK_GROUP_MIXED 2
 299
 300 struct btrfs_block_group_item {
 301         __le64 used;
 302         u8 flags;
 303 } __attribute__ ((__packed__));
 304
 305 struct btrfs_block_group_cache {
 306         struct btrfs_key key;
 307         struct btrfs_block_group_item item;
 308         int data;
 309         int cached;
 310         u64 pinned;
 311 };
 312 struct btrfs_fs_info {
 313         u8 fsid[BTRFS_FSID_SIZE];
 314         struct btrfs_root *extent_root;
 315         struct btrfs_root *tree_root;
 316         struct radix_tree_root fs_roots_radix;
 317
 318         struct extent_io_tree free_space_cache;
 319         struct extent_io_tree block_group_cache;
 320         struct extent_io_tree pinned_extents;
 321         struct extent_io_tree pending_del;
 322         struct extent_io_tree extent_ins;
 323
 324         u64 generation;
 325         u64 last_trans_committed;
 326         unsigned long mount_opt;
 327         u64 max_extent;
 328         u64 alloc_start;
 329         struct btrfs_transaction *running_transaction;
 330         struct btrfs_super_block super_copy;
 331         struct extent_buffer *sb_buffer;
 332         struct super_block *sb;
 333         struct inode *btree_inode;
 334         spinlock_t hash_lock;
 335         struct mutex trans_mutex;
 336         struct mutex fs_mutex;
 337         struct list_head trans_list;
 338         struct list_head hashers;
 339         struct list_head dead_roots;
 340 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
 341         struct work_struct trans_work;
 342 #else
 343         struct delayed_work trans_work;
 344 #endif
 345         struct kobject super_kobj;
 346         struct completion kobj_unregister;
 347         int do_barriers;
 348         int closing;
 349         unsigned long throttles;
 350
 351         u64 total_pinned;
 352         spinlock_t delalloc_lock;
 353         spinlock_t new_trans_lock;
 354         u64 delalloc_bytes;
 355         u64 last_alloc;
 356 };
 357 /*
 358  * in ram representation of the tree.  extent_root is used for all allocations
 359  * and for the extent tree extent_root root.
 360  */
 361 struct btrfs_root {
 362         struct extent_buffer *node;
 363         struct extent_buffer *commit_root;
 364         struct btrfs_root_item root_item;
 365         struct btrfs_key root_key;
 366         struct btrfs_fs_info *fs_info;
 367         struct inode *inode;
 368         struct kobject root_kobj;
 369         struct completion kobj_unregister;
 370         u64 objectid;
 371         u64 last_trans;
 372
 373         /* data allocations are done in sectorsize units */
 374         u32 sectorsize;
 375
 376         /* node allocations are done in nodesize units */
 377         u32 nodesize;
 378
 379         /* leaf allocations are done in leafsize units */
 380         u32 leafsize;
 381
 382         u32 stripesize;
 383
 384         u32 type;
 385         u64 highest_inode;
 386         u64 last_inode_alloc;
 387         int ref_cows;
 388         struct btrfs_key defrag_progress;
 389         int defrag_running;
 390         int defrag_level;
 391         char *name;
 392         int in_sysfs;
 393 };
 394
 395 /*
 396  * inode items have the data typically returned from stat and store other
 397  * info about object characteristics.  There is one for every file and dir in
 398  * the FS
 399  */
 400 #define BTRFS_INODE_ITEM_KEY            1
 401 #define BTRFS_INODE_REF_KEY             2
 402 #define BTRFS_XATTR_ITEM_KEY            8
 403 /* reserve 2-15 close to the inode for later flexibility */
 404
 405 /*
 406  * dir items are the name -> inode pointers in a directory.  There is one
 407  * for every name in a directory.
 408  */
 409 #define BTRFS_DIR_ITEM_KEY      16
 410 #define BTRFS_DIR_INDEX_KEY     17
 411 /*
 412  * extent data is for file data
 413  */
 414 #define BTRFS_EXTENT_DATA_KEY   18
 415 /*
 416  * csum items have the checksums for data in the extents
 417  */
 418 #define BTRFS_CSUM_ITEM_KEY     19
 419
 420 /* reserve 20-31 for other file stuff */
 421
 422 /*
 423  * root items point to tree roots.  There are typically in the root
 424  * tree used by the super block to find all the other trees
 425  */
 426 #define BTRFS_ROOT_ITEM_KEY     32
 427 /*
 428  * extent items are in the extent map tree.  These record which blocks
 429  * are used, and how many references there are to each block
 430  */
 431 #define BTRFS_EXTENT_ITEM_KEY   33
 432 #define BTRFS_EXTENT_REF_KEY    34
 433
 434 /*
 435  * block groups give us hints into the extent allocation trees.  Which
 436  * blocks are free etc etc
 437  */
 438 #define BTRFS_BLOCK_GROUP_ITEM_KEY 50
 439
 440 /*
 441  * string items are for debugging.  They just store a short string of
 442  * data in the FS
 443  */
 444 #define BTRFS_STRING_ITEM_KEY   253
 445
 446 #define BTRFS_MOUNT_NODATASUM           (1 << 0)
 447 #define BTRFS_MOUNT_NODATACOW           (1 << 1)
 448 #define BTRFS_MOUNT_NOBARRIER           (1 << 2)
 449 #define BTRFS_MOUNT_SSD                 (1 << 3)
 450
 451 #define btrfs_clear_opt(o, opt)         ((o) &= ~BTRFS_MOUNT_##opt)
 452 #define btrfs_set_opt(o, opt)           ((o) |= BTRFS_MOUNT_##opt)
 453 #define btrfs_test_opt(root, opt)       ((root)->fs_info->mount_opt & \
 454                                          BTRFS_MOUNT_##opt)
 455 /*
 456  * Inode flags
 457  */
 458 #define BTRFS_INODE_NODATASUM           (1 << 0)
 459 #define BTRFS_INODE_NODATACOW           (1 << 1)
 460 #define BTRFS_INODE_READONLY            (1 << 2)
 461 #define btrfs_clear_flag(inode, flag)   (BTRFS_I(inode)->flags &= \
 462                                          ~BTRFS_INODE_##flag)
 463 #define btrfs_set_flag(inode, flag)     (BTRFS_I(inode)->flags |= \
 464                                          BTRFS_INODE_##flag)
 465 #define btrfs_test_flag(inode, flag)    (BTRFS_I(inode)->flags & \
 466                                          BTRFS_INODE_##flag)
 467 /* some macros to generate set/get funcs for the struct fields.  This
 468  * assumes there is a lefoo_to_cpu for every type, so lets make a simple
 469  * one for u8:
 470  */
 471 #define le8_to_cpu(v) (v)
 472 #define cpu_to_le8(v) (v)
 473 #define __le8 u8
 474
 475 #define read_eb_member(eb, ptr, type, member, result) (                 \
 476         read_extent_buffer(eb, (char *)(result),                        \
 477                            ((unsigned long)(ptr)) +                     \
 478                             offsetof(type, member),                     \
 479                            sizeof(((type *)0)->member)))
 480
 481 #define write_eb_member(eb, ptr, type, member, result) (                \
 482         write_extent_buffer(eb, (char *)(result),                       \
 483                            ((unsigned long)(ptr)) +                     \
 484                             offsetof(type, member),                     \
 485                            sizeof(((type *)0)->member)))
 486
 487 #ifndef BTRFS_SETGET_FUNCS
 488 #define BTRFS_SETGET_FUNCS(name, type, member, bits)                    \
 489 u##bits btrfs_##name(struct extent_buffer *eb, type *s);                \
 490 void btrfs_set_##name(struct extent_buffer *eb, type *s, u##bits val);
 491 #endif
 492
 493 #define BTRFS_SETGET_HEADER_FUNCS(name, type, member, bits)             \
 494 static inline u##bits btrfs_##name(struct extent_buffer *eb)            \
 495 {                                                                       \
 496         char *kaddr = kmap_atomic(eb->first_page, KM_USER0);            \
 497         unsigned long offset = offsetof(type, member);                  \
 498         u##bits res;                                                    \
 499         __le##bits *tmp = (__le##bits *)(kaddr + offset);               \
 500         res = le##bits##_to_cpu(*tmp);                                  \
 501         kunmap_atomic(kaddr, KM_USER0);                                 \
 502         return res;                                                     \
 503 }                                                                       \
 504 static inline void btrfs_set_##name(struct extent_buffer *eb,           \
 505                                     u##bits val)                        \
 506 {                                                                       \
 507         char *kaddr = kmap_atomic(eb->first_page, KM_USER0);            \
 508         unsigned long offset = offsetof(type, member);                  \
 509         __le##bits *tmp = (__le##bits *)(kaddr + offset);               \
 510         *tmp = cpu_to_le##bits(val);                                    \
 511         kunmap_atomic(kaddr, KM_USER0);                                 \
 512 }
 513
 514 #define BTRFS_SETGET_STACK_FUNCS(name, type, member, bits)              \
 515 static inline u##bits btrfs_##name(type *s)                             \
 516 {                                                                       \
 517         return le##bits##_to_cpu(s->member);                            \
 518 }                                                                       \
 519 static inline void btrfs_set_##name(type *s, u##bits val)               \
 520 {                                                                       \
 521         s->member = cpu_to_le##bits(val);                               \
 522 }
 523
 524 /* struct btrfs_block_group_item */
 525 BTRFS_SETGET_STACK_FUNCS(block_group_used, struct btrfs_block_group_item,
 526                          used, 64);
 527 BTRFS_SETGET_FUNCS(disk_block_group_used, struct btrfs_block_group_item,
 528                          used, 64);
 529 BTRFS_SETGET_FUNCS(disk_block_group_flags, struct btrfs_block_group_item,
 530                    flags, 8);
 531
 532 /* struct btrfs_inode_ref */
 533 BTRFS_SETGET_FUNCS(inode_ref_name_len, struct btrfs_inode_ref, name_len, 16);
 534
 535 /* struct btrfs_inode_item */
 536 BTRFS_SETGET_FUNCS(inode_generation, struct btrfs_inode_item, generation, 64);
 537 BTRFS_SETGET_FUNCS(inode_size, struct btrfs_inode_item, size, 64);
 538 BTRFS_SETGET_FUNCS(inode_nblocks, struct btrfs_inode_item, nblocks, 64);
 539 BTRFS_SETGET_FUNCS(inode_block_group, struct btrfs_inode_item, block_group, 64);
 540 BTRFS_SETGET_FUNCS(inode_nlink, struct btrfs_inode_item, nlink, 32);
 541 BTRFS_SETGET_FUNCS(inode_uid, struct btrfs_inode_item, uid, 32);
 542 BTRFS_SETGET_FUNCS(inode_gid, struct btrfs_inode_item, gid, 32);
 543 BTRFS_SETGET_FUNCS(inode_mode, struct btrfs_inode_item, mode, 32);
 544 BTRFS_SETGET_FUNCS(inode_rdev, struct btrfs_inode_item, rdev, 32);
 545 BTRFS_SETGET_FUNCS(inode_flags, struct btrfs_inode_item, flags, 16);
 546 BTRFS_SETGET_FUNCS(inode_compat_flags, struct btrfs_inode_item,
 547                    compat_flags, 16);
 548
 549 static inline struct btrfs_inode_timespec *
 550 btrfs_inode_atime(struct btrfs_inode_item *inode_item)
 551 {
 552         unsigned long ptr = (unsigned long)inode_item;
 553         ptr += offsetof(struct btrfs_inode_item, atime);
 554         return (struct btrfs_inode_timespec *)ptr;
 555 }
 556
 557 static inline struct btrfs_inode_timespec *
 558 btrfs_inode_mtime(struct btrfs_inode_item *inode_item)
 559 {
 560         unsigned long ptr = (unsigned long)inode_item;
 561         ptr += offsetof(struct btrfs_inode_item, mtime);
 562         return (struct btrfs_inode_timespec *)ptr;
 563 }
 564
 565 static inline struct btrfs_inode_timespec *
 566 btrfs_inode_ctime(struct btrfs_inode_item *inode_item)
 567 {
 568         unsigned long ptr = (unsigned long)inode_item;
 569         ptr += offsetof(struct btrfs_inode_item, ctime);
 570         return (struct btrfs_inode_timespec *)ptr;
 571 }
 572
 573 static inline struct btrfs_inode_timespec *
 574 btrfs_inode_otime(struct btrfs_inode_item *inode_item)
 575 {
 576         unsigned long ptr = (unsigned long)inode_item;
 577         ptr += offsetof(struct btrfs_inode_item, otime);
 578         return (struct btrfs_inode_timespec *)ptr;
 579 }
 580
 581 BTRFS_SETGET_FUNCS(timespec_sec, struct btrfs_inode_timespec, sec, 64);
 582 BTRFS_SETGET_FUNCS(timespec_nsec, struct btrfs_inode_timespec, nsec, 32);
 583
 584 /* struct btrfs_extent_item */
 585 BTRFS_SETGET_FUNCS(extent_refs, struct btrfs_extent_item, refs, 32);
 586
 587 /* struct btrfs_extent_ref */
 588 BTRFS_SETGET_FUNCS(ref_root, struct btrfs_extent_ref, root, 64);
 589 BTRFS_SETGET_FUNCS(ref_generation, struct btrfs_extent_ref, generation, 64);
 590 BTRFS_SETGET_FUNCS(ref_objectid, struct btrfs_extent_ref, objectid, 64);
 591 BTRFS_SETGET_FUNCS(ref_offset, struct btrfs_extent_ref, offset, 64);
 592
 593 BTRFS_SETGET_STACK_FUNCS(stack_ref_root, struct btrfs_extent_ref, root, 64);
 594 BTRFS_SETGET_STACK_FUNCS(stack_ref_generation, struct btrfs_extent_ref,
 595                          generation, 64);
 596 BTRFS_SETGET_STACK_FUNCS(stack_ref_objectid, struct btrfs_extent_ref,
 597                          objectid, 64);
 598 BTRFS_SETGET_STACK_FUNCS(stack_ref_offset, struct btrfs_extent_ref, offset, 64);
 599
 600 BTRFS_SETGET_STACK_FUNCS(stack_extent_refs, struct btrfs_extent_item,
 601                          refs, 32);
 602
 603 /* struct btrfs_node */
 604 BTRFS_SETGET_FUNCS(key_blockptr, struct btrfs_key_ptr, blockptr, 64);
 605 BTRFS_SETGET_FUNCS(key_generation, struct btrfs_key_ptr, generation, 64);
 606
 607 static inline u64 btrfs_node_blockptr(struct extent_buffer *eb, int nr)
 608 {
 609         unsigned long ptr;
 610         ptr = offsetof(struct btrfs_node, ptrs) +
 611                 sizeof(struct btrfs_key_ptr) * nr;
 612         return btrfs_key_blockptr(eb, (struct btrfs_key_ptr *)ptr);
 613 }
 614
 615 static inline void btrfs_set_node_blockptr(struct extent_buffer *eb,
 616                                            int nr, u64 val)
 617 {
 618         unsigned long ptr;
 619         ptr = offsetof(struct btrfs_node, ptrs) +
 620                 sizeof(struct btrfs_key_ptr) * nr;
 621         btrfs_set_key_blockptr(eb, (struct btrfs_key_ptr *)ptr, val);
 622 }
 623
 624 static inline u64 btrfs_node_ptr_generation(struct extent_buffer *eb, int nr)
 625 {
 626         unsigned long ptr;
 627         ptr = offsetof(struct btrfs_node, ptrs) +
 628                 sizeof(struct btrfs_key_ptr) * nr;
 629         return btrfs_key_generation(eb, (struct btrfs_key_ptr *)ptr);
 630 }
 631
 632 static inline void btrfs_set_node_ptr_generation(struct extent_buffer *eb,
 633                                                  int nr, u64 val)
 634 {
 635         unsigned long ptr;
 636         ptr = offsetof(struct btrfs_node, ptrs) +
 637                 sizeof(struct btrfs_key_ptr) * nr;
 638         btrfs_set_key_generation(eb, (struct btrfs_key_ptr *)ptr, val);
 639 }
 640
 641 static inline unsigned long btrfs_node_key_ptr_offset(int nr)
 642 {
 643         return offsetof(struct btrfs_node, ptrs) +
 644                 sizeof(struct btrfs_key_ptr) * nr;
 645 }
 646
 647 void btrfs_node_key(struct extent_buffer *eb,
 648                     struct btrfs_disk_key *disk_key, int nr);
 649
 650 static inline void btrfs_set_node_key(struct extent_buffer *eb,
 651                                       struct btrfs_disk_key *disk_key, int nr)
 652 {
 653         unsigned long ptr;
 654         ptr = btrfs_node_key_ptr_offset(nr);
 655         write_eb_member(eb, (struct btrfs_key_ptr *)ptr,
 656                        struct btrfs_key_ptr, key, disk_key);
 657 }
 658
 659 /* struct btrfs_item */
 660 BTRFS_SETGET_FUNCS(item_offset, struct btrfs_item, offset, 32);
 661 BTRFS_SETGET_FUNCS(item_size, struct btrfs_item, size, 32);
 662
 663 static inline unsigned long btrfs_item_nr_offset(int nr)
 664 {
 665         return offsetof(struct btrfs_leaf, items) +
 666                 sizeof(struct btrfs_item) * nr;
 667 }
 668
 669 static inline struct btrfs_item *btrfs_item_nr(struct extent_buffer *eb,
 670                                                int nr)
 671 {
 672         return (struct btrfs_item *)btrfs_item_nr_offset(nr);
 673 }
 674
 675 static inline u32 btrfs_item_end(struct extent_buffer *eb,
 676                                  struct btrfs_item *item)
 677 {
 678         return btrfs_item_offset(eb, item) + btrfs_item_size(eb, item);
 679 }
 680
 681 static inline u32 btrfs_item_end_nr(struct extent_buffer *eb, int nr)
 682 {
 683         return btrfs_item_end(eb, btrfs_item_nr(eb, nr));
 684 }
 685
 686 static inline u32 btrfs_item_offset_nr(struct extent_buffer *eb, int nr)
 687 {
 688         return btrfs_item_offset(eb, btrfs_item_nr(eb, nr));
 689 }
 690
 691 static inline u32 btrfs_item_size_nr(struct extent_buffer *eb, int nr)
 692 {
 693         return btrfs_item_size(eb, btrfs_item_nr(eb, nr));
 694 }
 695
 696 static inline void btrfs_item_key(struct extent_buffer *eb,
 697                            struct btrfs_disk_key *disk_key, int nr)
 698 {
 699         struct btrfs_item *item = btrfs_item_nr(eb, nr);
 700         read_eb_member(eb, item, struct btrfs_item, key, disk_key);
 701 }
 702
 703 static inline void btrfs_set_item_key(struct extent_buffer *eb,
 704                                struct btrfs_disk_key *disk_key, int nr)
 705 {
 706         struct btrfs_item *item = btrfs_item_nr(eb, nr);
 707         write_eb_member(eb, item, struct btrfs_item, key, disk_key);
 708 }
 709
 710 /* struct btrfs_dir_item */
 711 BTRFS_SETGET_FUNCS(dir_data_len, struct btrfs_dir_item, data_len, 16);
 712 BTRFS_SETGET_FUNCS(dir_type, struct btrfs_dir_item, type, 8);
 713 BTRFS_SETGET_FUNCS(dir_name_len, struct btrfs_dir_item, name_len, 16);
 714
 715 static inline void btrfs_dir_item_key(struct extent_buffer *eb,
 716                                       struct btrfs_dir_item *item,
 717                                       struct btrfs_disk_key *key)
 718 {
 719         read_eb_member(eb, item, struct btrfs_dir_item, location, key);
 720 }
 721
 722 static inline void btrfs_set_dir_item_key(struct extent_buffer *eb,
 723                                           struct btrfs_dir_item *item,
 724                                           struct btrfs_disk_key *key)
 725 {
 726         write_eb_member(eb, item, struct btrfs_dir_item, location, key);
 727 }
 728
 729 /* struct btrfs_disk_key */
 730 BTRFS_SETGET_STACK_FUNCS(disk_key_objectid, struct btrfs_disk_key,
 731                          objectid, 64);
 732 BTRFS_SETGET_STACK_FUNCS(disk_key_offset, struct btrfs_disk_key, offset, 64);
 733 BTRFS_SETGET_STACK_FUNCS(disk_key_type, struct btrfs_disk_key, type, 8);
 734
 735 static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu,
 736                                          struct btrfs_disk_key *disk)
 737 {
 738         cpu->offset = le64_to_cpu(disk->offset);
 739         cpu->type = disk->type;
 740         cpu->objectid = le64_to_cpu(disk->objectid);
 741 }
 742
 743 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk,
 744                                          struct btrfs_key *cpu)
 745 {
 746         disk->offset = cpu_to_le64(cpu->offset);
 747         disk->type = cpu->type;
 748         disk->objectid = cpu_to_le64(cpu->objectid);
 749 }
 750
 751 static inline void btrfs_node_key_to_cpu(struct extent_buffer *eb,
 752                                   struct btrfs_key *key, int nr)
 753 {
 754         struct btrfs_disk_key disk_key;
 755         btrfs_node_key(eb, &disk_key, nr);
 756         btrfs_disk_key_to_cpu(key, &disk_key);
 757 }
 758
 759 static inline void btrfs_item_key_to_cpu(struct extent_buffer *eb,
 760                                   struct btrfs_key *key, int nr)
 761 {
 762         struct btrfs_disk_key disk_key;
 763         btrfs_item_key(eb, &disk_key, nr);
 764         btrfs_disk_key_to_cpu(key, &disk_key);
 765 }
 766
 767 static inline void btrfs_dir_item_key_to_cpu(struct extent_buffer *eb,
 768                                       struct btrfs_dir_item *item,
 769                                       struct btrfs_key *key)
 770 {
 771         struct btrfs_disk_key disk_key;
 772         btrfs_dir_item_key(eb, item, &disk_key);
 773         btrfs_disk_key_to_cpu(key, &disk_key);
 774 }
 775
 776
 777 static inline u8 btrfs_key_type(struct btrfs_key *key)
 778 {
 779         return key->type;
 780 }
 781
 782 static inline void btrfs_set_key_type(struct btrfs_key *key, u8 val)
 783 {
 784         key->type = val;
 785 }
 786
 787 /* struct btrfs_header */
 788 BTRFS_SETGET_HEADER_FUNCS(header_bytenr, struct btrfs_header, bytenr, 64);
 789 BTRFS_SETGET_HEADER_FUNCS(header_generation, struct btrfs_header,
 790                           generation, 64);
 791 BTRFS_SETGET_HEADER_FUNCS(header_owner, struct btrfs_header, owner, 64);
 792 BTRFS_SETGET_HEADER_FUNCS(header_nritems, struct btrfs_header, nritems, 32);
 793 BTRFS_SETGET_HEADER_FUNCS(header_flags, struct btrfs_header, flags, 16);
 794 BTRFS_SETGET_HEADER_FUNCS(header_level, struct btrfs_header, level, 8);
 795
 796 static inline u8 *btrfs_header_fsid(struct extent_buffer *eb)
 797 {
 798         unsigned long ptr = offsetof(struct btrfs_header, fsid);
 799         return (u8 *)ptr;
 800 }
 801
 802 static inline u8 *btrfs_super_fsid(struct extent_buffer *eb)
 803 {
 804         unsigned long ptr = offsetof(struct btrfs_super_block, fsid);
 805         return (u8 *)ptr;
 806 }
 807
 808 static inline u8 *btrfs_header_csum(struct extent_buffer *eb)
 809 {
 810         unsigned long ptr = offsetof(struct btrfs_header, csum);
 811         return (u8 *)ptr;
 812 }
 813
 814 static inline struct btrfs_node *btrfs_buffer_node(struct extent_buffer *eb)
 815 {
 816         return NULL;
 817 }
 818
 819 static inline struct btrfs_leaf *btrfs_buffer_leaf(struct extent_buffer *eb)
 820 {
 821         return NULL;
 822 }
 823
 824 static inline struct btrfs_header *btrfs_buffer_header(struct extent_buffer *eb)
 825 {
 826         return NULL;
 827 }
 828
 829 static inline int btrfs_is_leaf(struct extent_buffer *eb)
 830 {
 831         return (btrfs_header_level(eb) == 0);
 832 }
 833
 834 /* struct btrfs_root_item */
 835 BTRFS_SETGET_FUNCS(disk_root_refs, struct btrfs_root_item, refs, 32);
 836 BTRFS_SETGET_FUNCS(disk_root_bytenr, struct btrfs_root_item, bytenr, 64);
 837 BTRFS_SETGET_FUNCS(disk_root_level, struct btrfs_root_item, level, 8);
 838
 839 BTRFS_SETGET_STACK_FUNCS(root_bytenr, struct btrfs_root_item, bytenr, 64);
 840 BTRFS_SETGET_STACK_FUNCS(root_level, struct btrfs_root_item, level, 8);
 841 BTRFS_SETGET_STACK_FUNCS(root_dirid, struct btrfs_root_item, root_dirid, 64);
 842 BTRFS_SETGET_STACK_FUNCS(root_refs, struct btrfs_root_item, refs, 32);
 843 BTRFS_SETGET_STACK_FUNCS(root_flags, struct btrfs_root_item, flags, 32);
 844 BTRFS_SETGET_STACK_FUNCS(root_used, struct btrfs_root_item, bytes_used, 64);
 845 BTRFS_SETGET_STACK_FUNCS(root_limit, struct btrfs_root_item, byte_limit, 64);
 846
 847 /* struct btrfs_super_block */
 848 BTRFS_SETGET_STACK_FUNCS(super_bytenr, struct btrfs_super_block, bytenr, 64);
 849 BTRFS_SETGET_STACK_FUNCS(super_generation, struct btrfs_super_block,
 850                          generation, 64);
 851 BTRFS_SETGET_STACK_FUNCS(super_root, struct btrfs_super_block, root, 64);
 852 BTRFS_SETGET_STACK_FUNCS(super_root_level, struct btrfs_super_block,
 853                          root_level, 8);
 854 BTRFS_SETGET_STACK_FUNCS(super_total_bytes, struct btrfs_super_block,
 855                          total_bytes, 64);
 856 BTRFS_SETGET_STACK_FUNCS(super_bytes_used, struct btrfs_super_block,
 857                          bytes_used, 64);
 858 BTRFS_SETGET_STACK_FUNCS(super_sectorsize, struct btrfs_super_block,
 859                          sectorsize, 32);
 860 BTRFS_SETGET_STACK_FUNCS(super_nodesize, struct btrfs_super_block,
 861                          nodesize, 32);
 862 BTRFS_SETGET_STACK_FUNCS(super_leafsize, struct btrfs_super_block,
 863                          leafsize, 32);
 864 BTRFS_SETGET_STACK_FUNCS(super_stripesize, struct btrfs_super_block,
 865                          stripesize, 32);
 866 BTRFS_SETGET_STACK_FUNCS(super_root_dir, struct btrfs_super_block,
 867                          root_dir_objectid, 64);
 868
 869 static inline unsigned long btrfs_leaf_data(struct extent_buffer *l)
 870 {
 871         return offsetof(struct btrfs_leaf, items);
 872 }
 873
 874 /* struct btrfs_file_extent_item */
 875 BTRFS_SETGET_FUNCS(file_extent_type, struct btrfs_file_extent_item, type, 8);
 876
 877 static inline unsigned long btrfs_file_extent_inline_start(struct
 878                                                    btrfs_file_extent_item *e)
 879 {
 880         unsigned long offset = (unsigned long)e;
 881         offset += offsetof(struct btrfs_file_extent_item, disk_bytenr);
 882         return offset;
 883 }
 884
 885 static inline u32 btrfs_file_extent_calc_inline_size(u32 datasize)
 886 {
 887         return offsetof(struct btrfs_file_extent_item, disk_bytenr) + datasize;
 888 }
 889
 890 static inline u32 btrfs_file_extent_inline_len(struct extent_buffer *eb,
 891                                                struct btrfs_item *e)
 892 {
 893         unsigned long offset;
 894         offset = offsetof(struct btrfs_file_extent_item, disk_bytenr);
 895         return btrfs_item_size(eb, e) - offset;
 896 }
 897
 898 BTRFS_SETGET_FUNCS(file_extent_disk_bytenr, struct btrfs_file_extent_item,
 899                    disk_bytenr, 64);
 900 BTRFS_SETGET_FUNCS(file_extent_generation, struct btrfs_file_extent_item,
 901                    generation, 64);
 902 BTRFS_SETGET_FUNCS(file_extent_disk_num_bytes, struct btrfs_file_extent_item,
 903                    disk_num_bytes, 64);
 904 BTRFS_SETGET_FUNCS(file_extent_offset, struct btrfs_file_extent_item,
 905                   offset, 64);
 906 BTRFS_SETGET_FUNCS(file_extent_num_bytes, struct btrfs_file_extent_item,
 907                    num_bytes, 64);
 908
 909 static inline struct btrfs_root *btrfs_sb(struct super_block *sb)
 910 {
 911         return sb->s_fs_info;
 912 }
 913
 914 static inline int btrfs_set_root_name(struct btrfs_root *root,
 915                                       const char *name, int len)
 916 {
 917         /* if we already have a name just free it */
 918         if (root->name)
 919                 kfree(root->name);
 920
 921         root->name = kmalloc(len+1, GFP_KERNEL);
 922         if (!root->name)
 923                 return -ENOMEM;
 924
 925         memcpy(root->name, name, len);
 926         root->name[len] ='\0';
 927
 928         return 0;
 929 }
 930
 931 static inline u32 btrfs_level_size(struct btrfs_root *root, int level) {
 932         if (level == 0)
 933                 return root->leafsize;
 934         return root->nodesize;
 935 }
 936
 937 /* helper function to cast into the data area of the leaf. */
 938 #define btrfs_item_ptr(leaf, slot, type) \
 939         ((type *)(btrfs_leaf_data(leaf) + \
 940         btrfs_item_offset_nr(leaf, slot)))
 941
 942 #define btrfs_item_ptr_offset(leaf, slot) \
 943         ((unsigned long)(btrfs_leaf_data(leaf) + \
 944         btrfs_item_offset_nr(leaf, slot)))
 945
 946 static inline struct dentry *fdentry(struct file *file) {
 947 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
 948         return file->f_dentry;
 949 #else
 950         return file->f_path.dentry;
 951 #endif
 952 }
 953
 954 /* extent-tree.c */
 955 u32 btrfs_count_snapshots_in_path(struct btrfs_root *root,
 956                                   struct btrfs_path *count_path,
 957                                   u64 first_extent);
 958 int btrfs_extent_post_op(struct btrfs_trans_handle *trans,
 959                          struct btrfs_root *root);
 960 int btrfs_copy_pinned(struct btrfs_root *root, struct extent_io_tree *copy);
 961 struct btrfs_block_group_cache *btrfs_lookup_block_group(struct
 962                                                          btrfs_fs_info *info,
 963                                                          u64 bytenr);
 964 struct btrfs_block_group_cache *btrfs_find_block_group(struct btrfs_root *root,
 965                                                  struct btrfs_block_group_cache
 966                                                  *hint, u64 search_start,
 967                                                  int data, int owner);
 968 int btrfs_inc_root_ref(struct btrfs_trans_handle *trans,
 969                        struct btrfs_root *root, u64 owner_objectid);
 970 struct extent_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
 971                                             struct btrfs_root *root, u32 size,
 972                                             u64 root_objectid,
 973                                             u64 hint, u64 empty_size);
 974 struct extent_buffer *__btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
 975                                              struct btrfs_root *root,
 976                                              u32 blocksize,
 977                                              u64 root_objectid,
 978                                              u64 ref_generation,
 979                                              u64 first_objectid,
 980                                              int level,
 981                                              u64 hint,
 982                                              u64 empty_size);
 983 int btrfs_grow_extent_tree(struct btrfs_trans_handle *trans,
 984                            struct btrfs_root *root, u64 new_size);
 985 int btrfs_shrink_extent_tree(struct btrfs_root *root, u64 new_size);
 986 int btrfs_insert_extent_backref(struct btrfs_trans_handle *trans,
 987                                  struct btrfs_root *root,
 988                                  struct btrfs_path *path, u64 bytenr,
 989                                  u64 root_objectid, u64 ref_generation,
 990                                  u64 owner, u64 owner_offset);
 991 int btrfs_alloc_extent(struct btrfs_trans_handle *trans,
 992                        struct btrfs_root *root,
 993                        u64 num_bytes, u64 root_objectid, u64 ref_generation,
 994                        u64 owner, u64 owner_offset,
 995                        u64 empty_size, u64 hint_byte,
 996                        u64 search_end, struct btrfs_key *ins, int data);
 997 int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
 998                   struct extent_buffer *buf);
 999 int btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
1000                       *root, u64 bytenr, u64 num_bytes,
1001                       u64 root_objectid, u64 ref_generation,
1002                       u64 owner_objectid, u64 owner_offset, int pin);
1003 int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans,
1004                                struct btrfs_root *root,
1005                                struct extent_io_tree *unpin);
1006 int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
1007                                 struct btrfs_root *root,
1008                                 u64 bytenr, u64 num_bytes,
1009                                 u64 root_objectid, u64 ref_generation,
1010                                 u64 owner, u64 owner_offset);
1011 int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans,
1012                                     struct btrfs_root *root);
1013 int btrfs_free_block_groups(struct btrfs_fs_info *info);
1014 int btrfs_read_block_groups(struct btrfs_root *root);
1015 /* ctree.c */
1016 int btrfs_cow_block(struct btrfs_trans_handle *trans,
1017                     struct btrfs_root *root, struct extent_buffer *buf,
1018                     struct extent_buffer *parent, int parent_slot,
1019                     struct extent_buffer **cow_ret);
1020 int btrfs_copy_root(struct btrfs_trans_handle *trans,
1021                       struct btrfs_root *root,
1022                       struct extent_buffer *buf,
1023                       struct extent_buffer **cow_ret, u64 new_root_objectid);
1024 int btrfs_extend_item(struct btrfs_trans_handle *trans, struct btrfs_root
1025                       *root, struct btrfs_path *path, u32 data_size);
1026 int btrfs_truncate_item(struct btrfs_trans_handle *trans,
1027                         struct btrfs_root *root,
1028                         struct btrfs_path *path,
1029                         u32 new_size, int from_end);
1030 int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root
1031                       *root, struct btrfs_key *key, struct btrfs_path *p, int
1032                       ins_len, int cow);
1033 int btrfs_realloc_node(struct btrfs_trans_handle *trans,
1034                        struct btrfs_root *root, struct extent_buffer *parent,
1035                        int start_slot, int cache_only, u64 *last_ret,
1036                        struct btrfs_key *progress);
1037 void btrfs_release_path(struct btrfs_root *root, struct btrfs_path *p);
1038 struct btrfs_path *btrfs_alloc_path(void);
1039 void btrfs_free_path(struct btrfs_path *p);
1040 void btrfs_init_path(struct btrfs_path *p);
1041 int btrfs_del_item(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1042                    struct btrfs_path *path);
1043 int btrfs_insert_item(struct btrfs_trans_handle *trans, struct btrfs_root
1044                       *root, struct btrfs_key *key, void *data, u32 data_size);
1045 int btrfs_insert_empty_item(struct btrfs_trans_handle *trans, struct btrfs_root
1046                             *root, struct btrfs_path *path, struct btrfs_key
1047                             *cpu_key, u32 data_size);
1048 int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path);
1049 int btrfs_prev_leaf(struct btrfs_root *root, struct btrfs_path *path);
1050 int btrfs_leaf_free_space(struct btrfs_root *root, struct extent_buffer *leaf);
1051 int btrfs_drop_snapshot(struct btrfs_trans_handle *trans, struct btrfs_root
1052                         *root);
1053 /* root-item.c */
1054 int btrfs_del_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1055                    struct btrfs_key *key);
1056 int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root
1057                       *root, struct btrfs_key *key, struct btrfs_root_item
1058                       *item);
1059 int btrfs_update_root(struct btrfs_trans_handle *trans, struct btrfs_root
1060                       *root, struct btrfs_key *key, struct btrfs_root_item
1061                       *item);
1062 int btrfs_find_last_root(struct btrfs_root *root, u64 objectid, struct
1063                          btrfs_root_item *item, struct btrfs_key *key);
1064 int btrfs_find_dead_roots(struct btrfs_root *root, u64 objectid,
1065                           struct btrfs_root *latest_root);
1066 /* dir-item.c */
1067 int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
1068                           *root, const char *name, int name_len, u64 dir,
1069                           struct btrfs_key *location, u8 type);
1070 struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans,
1071                                              struct btrfs_root *root,
1072                                              struct btrfs_path *path, u64 dir,
1073                                              const char *name, int name_len,
1074                                              int mod);
1075 struct btrfs_dir_item *
1076 btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans,
1077                             struct btrfs_root *root,
1078                             struct btrfs_path *path, u64 dir,
1079                             u64 objectid, const char *name, int name_len,
1080                             int mod);
1081 struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_root *root,
1082                               struct btrfs_path *path,
1083                               const char *name, int name_len);
1084 int btrfs_delete_one_dir_name(struct btrfs_trans_handle *trans,
1085                               struct btrfs_root *root,
1086                               struct btrfs_path *path,
1087                               struct btrfs_dir_item *di);
1088 int btrfs_insert_xattr_item(struct btrfs_trans_handle *trans,
1089                             struct btrfs_root *root, const char *name,
1090                             u16 name_len, const void *data, u16 data_len,
1091                             u64 dir);
1092 struct btrfs_dir_item *btrfs_lookup_xattr(struct btrfs_trans_handle *trans,
1093                                           struct btrfs_root *root,
1094                                           struct btrfs_path *path, u64 dir,
1095                                           const char *name, u16 name_len,
1096                                           int mod);
1097 /* inode-map.c */
1098 int btrfs_find_free_objectid(struct btrfs_trans_handle *trans,
1099                              struct btrfs_root *fs_root,
1100                              u64 dirid, u64 *objectid);
1101 int btrfs_find_highest_inode(struct btrfs_root *fs_root, u64 *objectid);
1102
1103 /* inode-item.c */
1104 int btrfs_insert_inode_ref(struct btrfs_trans_handle *trans,
1105                            struct btrfs_root *root,
1106                            const char *name, int name_len,
1107                            u64 inode_objectid, u64 ref_objectid);
1108 int btrfs_del_inode_ref(struct btrfs_trans_handle *trans,
1109                            struct btrfs_root *root,
1110                            const char *name, int name_len,
1111                            u64 inode_objectid, u64 ref_objectid);
1112 int btrfs_insert_empty_inode(struct btrfs_trans_handle *trans,
1113                              struct btrfs_root *root,
1114                              struct btrfs_path *path, u64 objectid);
1115 int btrfs_lookup_inode(struct btrfs_trans_handle *trans, struct btrfs_root
1116                        *root, struct btrfs_path *path,
1117                        struct btrfs_key *location, int mod);
1118
1119 /* file-item.c */
1120 int btrfs_insert_file_extent(struct btrfs_trans_handle *trans,
1121                                struct btrfs_root *root,
1122                                u64 objectid, u64 pos, u64 offset,
1123                                u64 disk_num_bytes,
1124                                u64 num_bytes);
1125 int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
1126                              struct btrfs_root *root,
1127                              struct btrfs_path *path, u64 objectid,
1128                              u64 bytenr, int mod);
1129 int btrfs_csum_file_block(struct btrfs_trans_handle *trans,
1130                           struct btrfs_root *root,
1131                           struct inode *inode,
1132                           u64 objectid, u64 offset,
1133                           char *data, size_t len);
1134 struct btrfs_csum_item *btrfs_lookup_csum(struct btrfs_trans_handle *trans,
1135                                           struct btrfs_root *root,
1136                                           struct btrfs_path *path,
1137                                           u64 objectid, u64 offset,
1138                                           int cow);
1139 int btrfs_csum_truncate(struct btrfs_trans_handle *trans,
1140                         struct btrfs_root *root, struct btrfs_path *path,
1141                         u64 isize);
1142 /* inode.c */
1143 unsigned long btrfs_force_ra(struct address_space *mapping,
1144                               struct file_ra_state *ra, struct file *file,
1145                               pgoff_t offset, pgoff_t last_index);
1146 int btrfs_check_free_space(struct btrfs_root *root, u64 num_required,
1147                            int for_del);
1148 int btrfs_page_mkwrite(struct vm_area_struct *vma, struct page *page);
1149 int btrfs_readpage(struct file *file, struct page *page);
1150 void btrfs_delete_inode(struct inode *inode);
1151 void btrfs_put_inode(struct inode *inode);
1152 void btrfs_read_locked_inode(struct inode *inode);
1153 int btrfs_write_inode(struct inode *inode, int wait);
1154 void btrfs_dirty_inode(struct inode *inode);
1155 struct inode *btrfs_alloc_inode(struct super_block *sb);
1156 void btrfs_destroy_inode(struct inode *inode);
1157 int btrfs_init_cachep(void);
1158 void btrfs_destroy_cachep(void);
1159 long btrfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
1160 struct inode *btrfs_iget_locked(struct super_block *s, u64 objectid,
1161                                 struct btrfs_root *root);
1162 struct inode *btrfs_ilookup(struct super_block *s, u64 objectid,
1163                             u64 root_objectid);
1164 int btrfs_commit_write(struct file *file, struct page *page,
1165                        unsigned from, unsigned to);
1166 struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page,
1167                                     size_t page_offset, u64 start, u64 end,
1168                                     int create);
1169 int btrfs_update_inode(struct btrfs_trans_handle *trans,
1170                               struct btrfs_root *root,
1171                               struct inode *inode);
1172 /* file.c */
1173 int btrfs_drop_extent_cache(struct inode *inode, u64 start, u64 end);
1174 int btrfs_check_file(struct btrfs_root *root, struct inode *inode);
1175 extern struct file_operations btrfs_file_operations;
1176 int btrfs_drop_extents(struct btrfs_trans_handle *trans,
1177                        struct btrfs_root *root, struct inode *inode,
1178                        u64 start, u64 end, u64 inline_limit, u64 *hint_block);
1179 /* tree-defrag.c */
1180 int btrfs_defrag_leaves(struct btrfs_trans_handle *trans,
1181                         struct btrfs_root *root, int cache_only);
1182
1183 /* sysfs.c */
1184 int btrfs_init_sysfs(void);
1185 void btrfs_exit_sysfs(void);
1186 int btrfs_sysfs_add_super(struct btrfs_fs_info *fs);
1187 int btrfs_sysfs_add_root(struct btrfs_root *root);
1188 void btrfs_sysfs_del_root(struct btrfs_root *root);
1189 void btrfs_sysfs_del_super(struct btrfs_fs_info *root);
1190
1191 /* xattr.c */
1192 ssize_t btrfs_listxattr(struct dentry *dentry, char *buffer, size_t size);
1193 int btrfs_delete_xattrs(struct btrfs_trans_handle *trans,
1194                         struct btrfs_root *root, struct inode *inode);
1195 /* super.c */
1196 u64 btrfs_parse_size(char *str);
1197 #endif