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