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 max_inline;
 329         u64 alloc_start;
 330         struct btrfs_transaction *running_transaction;
 331         struct btrfs_super_block super_copy;
 332         struct extent_buffer *sb_buffer;
 333         struct super_block *sb;
 334         struct inode *btree_inode;
 335         spinlock_t hash_lock;
 336         struct mutex trans_mutex;
 337         struct mutex fs_mutex;
 338         struct list_head trans_list;
 339         struct list_head hashers;
 340         struct list_head dead_roots;
 341 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
 342         struct work_struct trans_work;
 343 #else
 344         struct delayed_work trans_work;
 345 #endif
 346         struct kobject super_kobj;
 347         struct completion kobj_unregister;
 348         int do_barriers;
 349         int closing;
 350         unsigned long throttles;
 351
 352         u64 total_pinned;
 353         spinlock_t delalloc_lock;
 354         spinlock_t new_trans_lock;
 355         u64 delalloc_bytes;
 356         u64 last_alloc;
 357 };
 358 /*
 359  * in ram representation of the tree.  extent_root is used for all allocations
 360  * and for the extent tree extent_root root.
 361  */
 362 struct btrfs_root {
 363         struct extent_buffer *node;
 364         struct extent_buffer *commit_root;
 365         struct btrfs_root_item root_item;
 366         struct btrfs_key root_key;
 367         struct btrfs_fs_info *fs_info;
 368         struct inode *inode;
 369         struct kobject root_kobj;
 370         struct completion kobj_unregister;
 371         u64 objectid;
 372         u64 last_trans;
 373
 374         /* data allocations are done in sectorsize units */
 375         u32 sectorsize;
 376
 377         /* node allocations are done in nodesize units */
 378         u32 nodesize;
 379
 380         /* leaf allocations are done in leafsize units */
 381         u32 leafsize;
 382
 383         u32 stripesize;
 384
 385         u32 type;
 386         u64 highest_inode;
 387         u64 last_inode_alloc;
 388         int ref_cows;
 389         struct btrfs_key defrag_progress;
 390         int defrag_running;
 391         int defrag_level;
 392         char *name;
 393         int in_sysfs;
 394 };
 395
 396 /*
 397  * inode items have the data typically returned from stat and store other
 398  * info about object characteristics.  There is one for every file and dir in
 399  * the FS
 400  */
 401 #define BTRFS_INODE_ITEM_KEY            1
 402 #define BTRFS_INODE_REF_KEY             2
 403 #define BTRFS_XATTR_ITEM_KEY            8
 404 /* reserve 2-15 close to the inode for later flexibility */
 405
 406 /*
 407  * dir items are the name -> inode pointers in a directory.  There is one
 408  * for every name in a directory.
 409  */
 410 #define BTRFS_DIR_ITEM_KEY      16
 411 #define BTRFS_DIR_INDEX_KEY     17
 412 /*
 413  * extent data is for file data
 414  */
 415 #define BTRFS_EXTENT_DATA_KEY   18
 416 /*
 417  * csum items have the checksums for data in the extents
 418  */
 419 #define BTRFS_CSUM_ITEM_KEY     19
 420
 421 /* reserve 20-31 for other file stuff */
 422
 423 /*
 424  * root items point to tree roots.  There are typically in the root
 425  * tree used by the super block to find all the other trees
 426  */
 427 #define BTRFS_ROOT_ITEM_KEY     32
 428 /*
 429  * extent items are in the extent map tree.  These record which blocks
 430  * are used, and how many references there are to each block
 431  */
 432 #define BTRFS_EXTENT_ITEM_KEY   33
 433 #define BTRFS_EXTENT_REF_KEY    34
 434
 435 /*
 436  * block groups give us hints into the extent allocation trees.  Which
 437  * blocks are free etc etc
 438  */
 439 #define BTRFS_BLOCK_GROUP_ITEM_KEY 50
 440
 441 /*
 442  * string items are for debugging.  They just store a short string of
 443  * data in the FS
 444  */
 445 #define BTRFS_STRING_ITEM_KEY   253
 446
 447 #define BTRFS_MOUNT_NODATASUM           (1 << 0)
 448 #define BTRFS_MOUNT_NODATACOW           (1 << 1)
 449 #define BTRFS_MOUNT_NOBARRIER           (1 << 2)
 450 #define BTRFS_MOUNT_SSD                 (1 << 3)
 451
 452 #define btrfs_clear_opt(o, opt)         ((o) &= ~BTRFS_MOUNT_##opt)
 453 #define btrfs_set_opt(o, opt)           ((o) |= BTRFS_MOUNT_##opt)
 454 #define btrfs_test_opt(root, opt)       ((root)->fs_info->mount_opt & \
 455                                          BTRFS_MOUNT_##opt)
 456 /*
 457  * Inode flags
 458  */
 459 #define BTRFS_INODE_NODATASUM           (1 << 0)
 460 #define BTRFS_INODE_NODATACOW           (1 << 1)
 461 #define BTRFS_INODE_READONLY            (1 << 2)
 462 #define btrfs_clear_flag(inode, flag)   (BTRFS_I(inode)->flags &= \
 463                                          ~BTRFS_INODE_##flag)
 464 #define btrfs_set_flag(inode, flag)     (BTRFS_I(inode)->flags |= \
 465                                          BTRFS_INODE_##flag)
 466 #define btrfs_test_flag(inode, flag)    (BTRFS_I(inode)->flags & \
 467                                          BTRFS_INODE_##flag)
 468 /* some macros to generate set/get funcs for the struct fields.  This
 469  * assumes there is a lefoo_to_cpu for every type, so lets make a simple
 470  * one for u8:
 471  */
 472 #define le8_to_cpu(v) (v)
 473 #define cpu_to_le8(v) (v)
 474 #define __le8 u8
 475
 476 #define read_eb_member(eb, ptr, type, member, result) (                 \
 477         read_extent_buffer(eb, (char *)(result),                        \
 478                            ((unsigned long)(ptr)) +                     \
 479                             offsetof(type, member),                     \
 480                            sizeof(((type *)0)->member)))
 481
 482 #define write_eb_member(eb, ptr, type, member, result) (                \
 483         write_extent_buffer(eb, (char *)(result),                       \
 484                            ((unsigned long)(ptr)) +                     \
 485                             offsetof(type, member),                     \
 486                            sizeof(((type *)0)->member)))
 487
 488 #ifndef BTRFS_SETGET_FUNCS
 489 #define BTRFS_SETGET_FUNCS(name, type, member, bits)                    \
 490 u##bits btrfs_##name(struct extent_buffer *eb, type *s);                \
 491 void btrfs_set_##name(struct extent_buffer *eb, type *s, u##bits val);
 492 #endif
 493
 494 #define BTRFS_SETGET_HEADER_FUNCS(name, type, member, bits)             \
 495 static inline u##bits btrfs_##name(struct extent_buffer *eb)            \
 496 {                                                                       \
 497         char *kaddr = kmap_atomic(eb->first_page, KM_USER0);            \
 498         unsigned long offset = offsetof(type, member);                  \
 499         u##bits res;                                                    \
 500         __le##bits *tmp = (__le##bits *)(kaddr + offset);               \
 501         res = le##bits##_to_cpu(*tmp);                                  \
 502         kunmap_atomic(kaddr, KM_USER0);                                 \
 503         return res;                                                     \
 504 }                                                                       \
 505 static inline void btrfs_set_##name(struct extent_buffer *eb,           \
 506                                     u##bits val)                        \
 507 {                                                                       \
 508         char *kaddr = kmap_atomic(eb->first_page, KM_USER0);            \
 509         unsigned long offset = offsetof(type, member);                  \
 510         __le##bits *tmp = (__le##bits *)(kaddr + offset);               \
 511         *tmp = cpu_to_le##bits(val);                                    \
 512         kunmap_atomic(kaddr, KM_USER0);                                 \
 513 }
 514
 515 #define BTRFS_SETGET_STACK_FUNCS(name, type, member, bits)              \
 516 static inline u##bits btrfs_##name(type *s)                             \
 517 {                                                                       \
 518         return le##bits##_to_cpu(s->member);                            \
 519 }                                                                       \
 520 static inline void btrfs_set_##name(type *s, u##bits val)               \
 521 {                                                                       \
 522         s->member = cpu_to_le##bits(val);                               \
 523 }
 524
 525 /* struct btrfs_block_group_item */
 526 BTRFS_SETGET_STACK_FUNCS(block_group_used, struct btrfs_block_group_item,
 527                          used, 64);
 528 BTRFS_SETGET_FUNCS(disk_block_group_used, struct btrfs_block_group_item,
 529                          used, 64);
 530 BTRFS_SETGET_FUNCS(disk_block_group_flags, struct btrfs_block_group_item,
 531                    flags, 8);
 532
 533 /* struct btrfs_inode_ref */
 534 BTRFS_SETGET_FUNCS(inode_ref_name_len, struct btrfs_inode_ref, name_len, 16);
 535
 536 /* struct btrfs_inode_item */
 537 BTRFS_SETGET_FUNCS(inode_generation, struct btrfs_inode_item, generation, 64);
 538 BTRFS_SETGET_FUNCS(inode_size, struct btrfs_inode_item, size, 64);
 539 BTRFS_SETGET_FUNCS(inode_nblocks, struct btrfs_inode_item, nblocks, 64);
 540 BTRFS_SETGET_FUNCS(inode_block_group, struct btrfs_inode_item, block_group, 64);
 541 BTRFS_SETGET_FUNCS(inode_nlink, struct btrfs_inode_item, nlink, 32);
 542 BTRFS_SETGET_FUNCS(inode_uid, struct btrfs_inode_item, uid, 32);
 543 BTRFS_SETGET_FUNCS(inode_gid, struct btrfs_inode_item, gid, 32);
 544 BTRFS_SETGET_FUNCS(inode_mode, struct btrfs_inode_item, mode, 32);
 545 BTRFS_SETGET_FUNCS(inode_rdev, struct btrfs_inode_item, rdev, 32);
 546 BTRFS_SETGET_FUNCS(inode_flags, struct btrfs_inode_item, flags, 16);
 547 BTRFS_SETGET_FUNCS(inode_compat_flags, struct btrfs_inode_item,
 548                    compat_flags, 16);
 549
 550 static inline struct btrfs_inode_timespec *
 551 btrfs_inode_atime(struct btrfs_inode_item *inode_item)
 552 {
 553         unsigned long ptr = (unsigned long)inode_item;
 554         ptr += offsetof(struct btrfs_inode_item, atime);
 555         return (struct btrfs_inode_timespec *)ptr;
 556 }
 557
 558 static inline struct btrfs_inode_timespec *
 559 btrfs_inode_mtime(struct btrfs_inode_item *inode_item)
 560 {
 561         unsigned long ptr = (unsigned long)inode_item;
 562         ptr += offsetof(struct btrfs_inode_item, mtime);
 563         return (struct btrfs_inode_timespec *)ptr;
 564 }
 565
 566 static inline struct btrfs_inode_timespec *
 567 btrfs_inode_ctime(struct btrfs_inode_item *inode_item)
 568 {
 569         unsigned long ptr = (unsigned long)inode_item;
 570         ptr += offsetof(struct btrfs_inode_item, ctime);
 571         return (struct btrfs_inode_timespec *)ptr;
 572 }
 573
 574 static inline struct btrfs_inode_timespec *
 575 btrfs_inode_otime(struct btrfs_inode_item *inode_item)
 576 {
 577         unsigned long ptr = (unsigned long)inode_item;
 578         ptr += offsetof(struct btrfs_inode_item, otime);
 579         return (struct btrfs_inode_timespec *)ptr;
 580 }
 581
 582 BTRFS_SETGET_FUNCS(timespec_sec, struct btrfs_inode_timespec, sec, 64);
 583 BTRFS_SETGET_FUNCS(timespec_nsec, struct btrfs_inode_timespec, nsec, 32);
 584
 585 /* struct btrfs_extent_item */
 586 BTRFS_SETGET_FUNCS(extent_refs, struct btrfs_extent_item, refs, 32);
 587
 588 /* struct btrfs_extent_ref */
 589 BTRFS_SETGET_FUNCS(ref_root, struct btrfs_extent_ref, root, 64);
 590 BTRFS_SETGET_FUNCS(ref_generation, struct btrfs_extent_ref, generation, 64);
 591 BTRFS_SETGET_FUNCS(ref_objectid, struct btrfs_extent_ref, objectid, 64);
 592 BTRFS_SETGET_FUNCS(ref_offset, struct btrfs_extent_ref, offset, 64);
 593
 594 BTRFS_SETGET_STACK_FUNCS(stack_ref_root, struct btrfs_extent_ref, root, 64);
 595 BTRFS_SETGET_STACK_FUNCS(stack_ref_generation, struct btrfs_extent_ref,
 596                          generation, 64);
 597 BTRFS_SETGET_STACK_FUNCS(stack_ref_objectid, struct btrfs_extent_ref,
 598                          objectid, 64);
 599 BTRFS_SETGET_STACK_FUNCS(stack_ref_offset, struct btrfs_extent_ref, offset, 64);
 600
 601 BTRFS_SETGET_STACK_FUNCS(stack_extent_refs, struct btrfs_extent_item,
 602                          refs, 32);
 603
 604 /* struct btrfs_node */
 605 BTRFS_SETGET_FUNCS(key_blockptr, struct btrfs_key_ptr, blockptr, 64);
 606 BTRFS_SETGET_FUNCS(key_generation, struct btrfs_key_ptr, generation, 64);
 607
 608 static inline u64 btrfs_node_blockptr(struct extent_buffer *eb, int nr)
 609 {
 610         unsigned long ptr;
 611         ptr = offsetof(struct btrfs_node, ptrs) +
 612                 sizeof(struct btrfs_key_ptr) * nr;
 613         return btrfs_key_blockptr(eb, (struct btrfs_key_ptr *)ptr);
 614 }
 615
 616 static inline void btrfs_set_node_blockptr(struct extent_buffer *eb,
 617                                            int nr, u64 val)
 618 {
 619         unsigned long ptr;
 620         ptr = offsetof(struct btrfs_node, ptrs) +
 621                 sizeof(struct btrfs_key_ptr) * nr;
 622         btrfs_set_key_blockptr(eb, (struct btrfs_key_ptr *)ptr, val);
 623 }
 624
 625 static inline u64 btrfs_node_ptr_generation(struct extent_buffer *eb, int nr)
 626 {
 627         unsigned long ptr;
 628         ptr = offsetof(struct btrfs_node, ptrs) +
 629                 sizeof(struct btrfs_key_ptr) * nr;
 630         return btrfs_key_generation(eb, (struct btrfs_key_ptr *)ptr);
 631 }
 632
 633 static inline void btrfs_set_node_ptr_generation(struct extent_buffer *eb,
 634                                                  int nr, u64 val)
 635 {
 636         unsigned long ptr;
 637         ptr = offsetof(struct btrfs_node, ptrs) +
 638                 sizeof(struct btrfs_key_ptr) * nr;
 639         btrfs_set_key_generation(eb, (struct btrfs_key_ptr *)ptr, val);
 640 }
 641
 642 static inline unsigned long btrfs_node_key_ptr_offset(int nr)
 643 {
 644         return offsetof(struct btrfs_node, ptrs) +
 645                 sizeof(struct btrfs_key_ptr) * nr;
 646 }
 647
 648 void btrfs_node_key(struct extent_buffer *eb,
 649                     struct btrfs_disk_key *disk_key, int nr);
 650
 651 static inline void btrfs_set_node_key(struct extent_buffer *eb,
 652                                       struct btrfs_disk_key *disk_key, int nr)
 653 {
 654         unsigned long ptr;
 655         ptr = btrfs_node_key_ptr_offset(nr);
 656         write_eb_member(eb, (struct btrfs_key_ptr *)ptr,
 657                        struct btrfs_key_ptr, key, disk_key);
 658 }
 659
 660 /* struct btrfs_item */
 661 BTRFS_SETGET_FUNCS(item_offset, struct btrfs_item, offset, 32);
 662 BTRFS_SETGET_FUNCS(item_size, struct btrfs_item, size, 32);
 663
 664 static inline unsigned long btrfs_item_nr_offset(int nr)
 665 {
 666         return offsetof(struct btrfs_leaf, items) +
 667                 sizeof(struct btrfs_item) * nr;
 668 }
 669
 670 static inline struct btrfs_item *btrfs_item_nr(struct extent_buffer *eb,
 671                                                int nr)
 672 {
 673         return (struct btrfs_item *)btrfs_item_nr_offset(nr);
 674 }
 675
 676 static inline u32 btrfs_item_end(struct extent_buffer *eb,
 677                                  struct btrfs_item *item)
 678 {
 679         return btrfs_item_offset(eb, item) + btrfs_item_size(eb, item);
 680 }
 681
 682 static inline u32 btrfs_item_end_nr(struct extent_buffer *eb, int nr)
 683 {
 684         return btrfs_item_end(eb, btrfs_item_nr(eb, nr));
 685 }
 686
 687 static inline u32 btrfs_item_offset_nr(struct extent_buffer *eb, int nr)
 688 {
 689         return btrfs_item_offset(eb, btrfs_item_nr(eb, nr));
 690 }
 691
 692 static inline u32 btrfs_item_size_nr(struct extent_buffer *eb, int nr)
 693 {
 694         return btrfs_item_size(eb, btrfs_item_nr(eb, nr));
 695 }
 696
 697 static inline void btrfs_item_key(struct extent_buffer *eb,
 698                            struct btrfs_disk_key *disk_key, int nr)
 699 {
 700         struct btrfs_item *item = btrfs_item_nr(eb, nr);
 701         read_eb_member(eb, item, struct btrfs_item, key, disk_key);
 702 }
 703
 704 static inline void btrfs_set_item_key(struct extent_buffer *eb,
 705                                struct btrfs_disk_key *disk_key, int nr)
 706 {
 707         struct btrfs_item *item = btrfs_item_nr(eb, nr);
 708         write_eb_member(eb, item, struct btrfs_item, key, disk_key);
 709 }
 710
 711 /* struct btrfs_dir_item */
 712 BTRFS_SETGET_FUNCS(dir_data_len, struct btrfs_dir_item, data_len, 16);
 713 BTRFS_SETGET_FUNCS(dir_type, struct btrfs_dir_item, type, 8);
 714 BTRFS_SETGET_FUNCS(dir_name_len, struct btrfs_dir_item, name_len, 16);
 715
 716 static inline void btrfs_dir_item_key(struct extent_buffer *eb,
 717                                       struct btrfs_dir_item *item,
 718                                       struct btrfs_disk_key *key)
 719 {
 720         read_eb_member(eb, item, struct btrfs_dir_item, location, key);
 721 }
 722
 723 static inline void btrfs_set_dir_item_key(struct extent_buffer *eb,
 724                                           struct btrfs_dir_item *item,
 725                                           struct btrfs_disk_key *key)
 726 {
 727         write_eb_member(eb, item, struct btrfs_dir_item, location, key);
 728 }
 729
 730 /* struct btrfs_disk_key */
 731 BTRFS_SETGET_STACK_FUNCS(disk_key_objectid, struct btrfs_disk_key,
 732                          objectid, 64);
 733 BTRFS_SETGET_STACK_FUNCS(disk_key_offset, struct btrfs_disk_key, offset, 64);
 734 BTRFS_SETGET_STACK_FUNCS(disk_key_type, struct btrfs_disk_key, type, 8);
 735
 736 static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu,
 737                                          struct btrfs_disk_key *disk)
 738 {
 739         cpu->offset = le64_to_cpu(disk->offset);
 740         cpu->type = disk->type;
 741         cpu->objectid = le64_to_cpu(disk->objectid);
 742 }
 743
 744 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk,
 745                                          struct btrfs_key *cpu)
 746 {
 747         disk->offset = cpu_to_le64(cpu->offset);
 748         disk->type = cpu->type;
 749         disk->objectid = cpu_to_le64(cpu->objectid);
 750 }
 751
 752 static inline void btrfs_node_key_to_cpu(struct extent_buffer *eb,
 753                                   struct btrfs_key *key, int nr)
 754 {
 755         struct btrfs_disk_key disk_key;
 756         btrfs_node_key(eb, &disk_key, nr);
 757         btrfs_disk_key_to_cpu(key, &disk_key);
 758 }
 759
 760 static inline void btrfs_item_key_to_cpu(struct extent_buffer *eb,
 761                                   struct btrfs_key *key, int nr)
 762 {
 763         struct btrfs_disk_key disk_key;
 764         btrfs_item_key(eb, &disk_key, nr);
 765         btrfs_disk_key_to_cpu(key, &disk_key);
 766 }
 767
 768 static inline void btrfs_dir_item_key_to_cpu(struct extent_buffer *eb,
 769                                       struct btrfs_dir_item *item,
 770                                       struct btrfs_key *key)
 771 {
 772         struct btrfs_disk_key disk_key;
 773         btrfs_dir_item_key(eb, item, &disk_key);
 774         btrfs_disk_key_to_cpu(key, &disk_key);
 775 }
 776
 777
 778 static inline u8 btrfs_key_type(struct btrfs_key *key)
 779 {
 780         return key->type;
 781 }
 782
 783 static inline void btrfs_set_key_type(struct btrfs_key *key, u8 val)
 784 {
 785         key->type = val;
 786 }
 787
 788 /* struct btrfs_header */
 789 BTRFS_SETGET_HEADER_FUNCS(header_bytenr, struct btrfs_header, bytenr, 64);
 790 BTRFS_SETGET_HEADER_FUNCS(header_generation, struct btrfs_header,
 791                           generation, 64);
 792 BTRFS_SETGET_HEADER_FUNCS(header_owner, struct btrfs_header, owner, 64);
 793 BTRFS_SETGET_HEADER_FUNCS(header_nritems, struct btrfs_header, nritems, 32);
 794 BTRFS_SETGET_HEADER_FUNCS(header_flags, struct btrfs_header, flags, 16);
 795 BTRFS_SETGET_HEADER_FUNCS(header_level, struct btrfs_header, level, 8);
 796
 797 static inline u8 *btrfs_header_fsid(struct extent_buffer *eb)
 798 {
 799         unsigned long ptr = offsetof(struct btrfs_header, fsid);
 800         return (u8 *)ptr;
 801 }
 802
 803 static inline u8 *btrfs_super_fsid(struct extent_buffer *eb)
 804 {
 805         unsigned long ptr = offsetof(struct btrfs_super_block, fsid);
 806         return (u8 *)ptr;
 807 }
 808
 809 static inline u8 *btrfs_header_csum(struct extent_buffer *eb)
 810 {
 811         unsigned long ptr = offsetof(struct btrfs_header, csum);
 812         return (u8 *)ptr;
 813 }
 814
 815 static inline struct btrfs_node *btrfs_buffer_node(struct extent_buffer *eb)
 816 {
 817         return NULL;
 818 }
 819
 820 static inline struct btrfs_leaf *btrfs_buffer_leaf(struct extent_buffer *eb)
 821 {
 822         return NULL;
 823 }
 824
 825 static inline struct btrfs_header *btrfs_buffer_header(struct extent_buffer *eb)
 826 {
 827         return NULL;
 828 }
 829
 830 static inline int btrfs_is_leaf(struct extent_buffer *eb)
 831 {
 832         return (btrfs_header_level(eb) == 0);
 833 }
 834
 835 /* struct btrfs_root_item */
 836 BTRFS_SETGET_FUNCS(disk_root_refs, struct btrfs_root_item, refs, 32);
 837 BTRFS_SETGET_FUNCS(disk_root_bytenr, struct btrfs_root_item, bytenr, 64);
 838 BTRFS_SETGET_FUNCS(disk_root_level, struct btrfs_root_item, level, 8);
 839
 840 BTRFS_SETGET_STACK_FUNCS(root_bytenr, struct btrfs_root_item, bytenr, 64);
 841 BTRFS_SETGET_STACK_FUNCS(root_level, struct btrfs_root_item, level, 8);
 842 BTRFS_SETGET_STACK_FUNCS(root_dirid, struct btrfs_root_item, root_dirid, 64);
 843 BTRFS_SETGET_STACK_FUNCS(root_refs, struct btrfs_root_item, refs, 32);
 844 BTRFS_SETGET_STACK_FUNCS(root_flags, struct btrfs_root_item, flags, 32);
 845 BTRFS_SETGET_STACK_FUNCS(root_used, struct btrfs_root_item, bytes_used, 64);
 846 BTRFS_SETGET_STACK_FUNCS(root_limit, struct btrfs_root_item, byte_limit, 64);
 847
 848 /* struct btrfs_super_block */
 849 BTRFS_SETGET_STACK_FUNCS(super_bytenr, struct btrfs_super_block, bytenr, 64);
 850 BTRFS_SETGET_STACK_FUNCS(super_generation, struct btrfs_super_block,
 851                          generation, 64);
 852 BTRFS_SETGET_STACK_FUNCS(super_root, struct btrfs_super_block, root, 64);
 853 BTRFS_SETGET_STACK_FUNCS(super_root_level, struct btrfs_super_block,
 854                          root_level, 8);
 855 BTRFS_SETGET_STACK_FUNCS(super_total_bytes, struct btrfs_super_block,
 856                          total_bytes, 64);
 857 BTRFS_SETGET_STACK_FUNCS(super_bytes_used, struct btrfs_super_block,
 858                          bytes_used, 64);
 859 BTRFS_SETGET_STACK_FUNCS(super_sectorsize, struct btrfs_super_block,
 860                          sectorsize, 32);
 861 BTRFS_SETGET_STACK_FUNCS(super_nodesize, struct btrfs_super_block,
 862                          nodesize, 32);
 863 BTRFS_SETGET_STACK_FUNCS(super_leafsize, struct btrfs_super_block,
 864                          leafsize, 32);
 865 BTRFS_SETGET_STACK_FUNCS(super_stripesize, struct btrfs_super_block,
 866                          stripesize, 32);
 867 BTRFS_SETGET_STACK_FUNCS(super_root_dir, struct btrfs_super_block,
 868                          root_dir_objectid, 64);
 869
 870 static inline unsigned long btrfs_leaf_data(struct extent_buffer *l)
 871 {
 872         return offsetof(struct btrfs_leaf, items);
 873 }
 874
 875 /* struct btrfs_file_extent_item */
 876 BTRFS_SETGET_FUNCS(file_extent_type, struct btrfs_file_extent_item, type, 8);
 877
 878 static inline unsigned long btrfs_file_extent_inline_start(struct
 879                                                    btrfs_file_extent_item *e)
 880 {
 881         unsigned long offset = (unsigned long)e;
 882         offset += offsetof(struct btrfs_file_extent_item, disk_bytenr);
 883         return offset;
 884 }
 885
 886 static inline u32 btrfs_file_extent_calc_inline_size(u32 datasize)
 887 {
 888         return offsetof(struct btrfs_file_extent_item, disk_bytenr) + datasize;
 889 }
 890
 891 static inline u32 btrfs_file_extent_inline_len(struct extent_buffer *eb,
 892                                                struct btrfs_item *e)
 893 {
 894         unsigned long offset;
 895         offset = offsetof(struct btrfs_file_extent_item, disk_bytenr);
 896         return btrfs_item_size(eb, e) - offset;
 897 }
 898
 899 BTRFS_SETGET_FUNCS(file_extent_disk_bytenr, struct btrfs_file_extent_item,
 900                    disk_bytenr, 64);
 901 BTRFS_SETGET_FUNCS(file_extent_generation, struct btrfs_file_extent_item,
 902                    generation, 64);
 903 BTRFS_SETGET_FUNCS(file_extent_disk_num_bytes, struct btrfs_file_extent_item,
 904                    disk_num_bytes, 64);
 905 BTRFS_SETGET_FUNCS(file_extent_offset, struct btrfs_file_extent_item,
 906                   offset, 64);
 907 BTRFS_SETGET_FUNCS(file_extent_num_bytes, struct btrfs_file_extent_item,
 908                    num_bytes, 64);
 909
 910 static inline struct btrfs_root *btrfs_sb(struct super_block *sb)
 911 {
 912         return sb->s_fs_info;
 913 }
 914
 915 static inline int btrfs_set_root_name(struct btrfs_root *root,
 916                                       const char *name, int len)
 917 {
 918         /* if we already have a name just free it */
 919         if (root->name)
 920                 kfree(root->name);
 921
 922         root->name = kmalloc(len+1, GFP_KERNEL);
 923         if (!root->name)
 924                 return -ENOMEM;
 925
 926         memcpy(root->name, name, len);
 927         root->name[len] ='\0';
 928
 929         return 0;
 930 }
 931
 932 static inline u32 btrfs_level_size(struct btrfs_root *root, int level) {
 933         if (level == 0)
 934                 return root->leafsize;
 935         return root->nodesize;
 936 }
 937
 938 /* helper function to cast into the data area of the leaf. */
 939 #define btrfs_item_ptr(leaf, slot, type) \
 940         ((type *)(btrfs_leaf_data(leaf) + \
 941         btrfs_item_offset_nr(leaf, slot)))
 942
 943 #define btrfs_item_ptr_offset(leaf, slot) \
 944         ((unsigned long)(btrfs_leaf_data(leaf) + \
 945         btrfs_item_offset_nr(leaf, slot)))
 946
 947 static inline struct dentry *fdentry(struct file *file) {
 948 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
 949         return file->f_dentry;
 950 #else
 951         return file->f_path.dentry;
 952 #endif
 953 }
 954
 955 /* extent-tree.c */
 956 u32 btrfs_count_snapshots_in_path(struct btrfs_root *root,
 957                                   struct btrfs_path *count_path,
 958                                   u64 first_extent);
 959 int btrfs_extent_post_op(struct btrfs_trans_handle *trans,
 960                          struct btrfs_root *root);
 961 int btrfs_copy_pinned(struct btrfs_root *root, struct extent_io_tree *copy);
 962 struct btrfs_block_group_cache *btrfs_lookup_block_group(struct
 963                                                          btrfs_fs_info *info,
 964                                                          u64 bytenr);
 965 struct btrfs_block_group_cache *btrfs_find_block_group(struct btrfs_root *root,
 966                                                  struct btrfs_block_group_cache
 967                                                  *hint, u64 search_start,
 968                                                  int data, int owner);
 969 int btrfs_inc_root_ref(struct btrfs_trans_handle *trans,
 970                        struct btrfs_root *root, u64 owner_objectid);
 971 struct extent_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
 972                                             struct btrfs_root *root, u32 size,
 973                                             u64 root_objectid,
 974                                             u64 hint, u64 empty_size);
 975 struct extent_buffer *__btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
 976                                              struct btrfs_root *root,
 977                                              u32 blocksize,
 978                                              u64 root_objectid,
 979                                              u64 ref_generation,
 980                                              u64 first_objectid,
 981                                              int level,
 982                                              u64 hint,
 983                                              u64 empty_size);
 984 int btrfs_grow_extent_tree(struct btrfs_trans_handle *trans,
 985                            struct btrfs_root *root, u64 new_size);
 986 int btrfs_shrink_extent_tree(struct btrfs_root *root, u64 new_size);
 987 int btrfs_insert_extent_backref(struct btrfs_trans_handle *trans,
 988                                  struct btrfs_root *root,
 989                                  struct btrfs_path *path, u64 bytenr,
 990                                  u64 root_objectid, u64 ref_generation,
 991                                  u64 owner, u64 owner_offset);
 992 int btrfs_alloc_extent(struct btrfs_trans_handle *trans,
 993                        struct btrfs_root *root,
 994                        u64 num_bytes, u64 root_objectid, u64 ref_generation,
 995                        u64 owner, u64 owner_offset,
 996                        u64 empty_size, u64 hint_byte,
 997                        u64 search_end, struct btrfs_key *ins, int data);
 998 int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
 999                   struct extent_buffer *buf);
1000 int btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
1001                       *root, u64 bytenr, u64 num_bytes,
1002                       u64 root_objectid, u64 ref_generation,
1003                       u64 owner_objectid, u64 owner_offset, int pin);
1004 int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans,
1005                                struct btrfs_root *root,
1006                                struct extent_io_tree *unpin);
1007 int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
1008                                 struct btrfs_root *root,
1009                                 u64 bytenr, u64 num_bytes,
1010                                 u64 root_objectid, u64 ref_generation,
1011                                 u64 owner, u64 owner_offset);
1012 int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans,
1013                                     struct btrfs_root *root);
1014 int btrfs_free_block_groups(struct btrfs_fs_info *info);
1015 int btrfs_read_block_groups(struct btrfs_root *root);
1016 /* ctree.c */
1017 int btrfs_cow_block(struct btrfs_trans_handle *trans,
1018                     struct btrfs_root *root, struct extent_buffer *buf,
1019                     struct extent_buffer *parent, int parent_slot,
1020                     struct extent_buffer **cow_ret);
1021 int btrfs_copy_root(struct btrfs_trans_handle *trans,
1022                       struct btrfs_root *root,
1023                       struct extent_buffer *buf,
1024                       struct extent_buffer **cow_ret, u64 new_root_objectid);
1025 int btrfs_extend_item(struct btrfs_trans_handle *trans, struct btrfs_root
1026                       *root, struct btrfs_path *path, u32 data_size);
1027 int btrfs_truncate_item(struct btrfs_trans_handle *trans,
1028                         struct btrfs_root *root,
1029                         struct btrfs_path *path,
1030                         u32 new_size, int from_end);
1031 int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root
1032                       *root, struct btrfs_key *key, struct btrfs_path *p, int
1033                       ins_len, int cow);
1034 int btrfs_realloc_node(struct btrfs_trans_handle *trans,
1035                        struct btrfs_root *root, struct extent_buffer *parent,
1036                        int start_slot, int cache_only, u64 *last_ret,
1037                        struct btrfs_key *progress);
1038 void btrfs_release_path(struct btrfs_root *root, struct btrfs_path *p);
1039 struct btrfs_path *btrfs_alloc_path(void);
1040 void btrfs_free_path(struct btrfs_path *p);
1041 void btrfs_init_path(struct btrfs_path *p);
1042 int btrfs_del_items(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1043                    struct btrfs_path *path, int slot, int nr);
1044
1045 static inline int btrfs_del_item(struct btrfs_trans_handle *trans,
1046                                  struct btrfs_root *root,
1047                                  struct btrfs_path *path)
1048 {
1049         return btrfs_del_items(trans, root, path, path->slots[0], 1);
1050 }
1051
1052 int btrfs_insert_item(struct btrfs_trans_handle *trans, struct btrfs_root
1053                       *root, struct btrfs_key *key, void *data, u32 data_size);
1054 int btrfs_insert_empty_items(struct btrfs_trans_handle *trans,
1055                              struct btrfs_root *root,
1056                              struct btrfs_path *path,
1057                              struct btrfs_key *cpu_key, u32 *data_size, int nr);
1058
1059 static inline int btrfs_insert_empty_item(struct btrfs_trans_handle *trans,
1060                                           struct btrfs_root *root,
1061                                           struct btrfs_path *path,
1062                                           struct btrfs_key *key,
1063                                           u32 data_size)
1064 {
1065         return btrfs_insert_empty_items(trans, root, path, key, &data_size, 1);
1066 }
1067
1068 int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path);
1069 int btrfs_prev_leaf(struct btrfs_root *root, struct btrfs_path *path);
1070 int btrfs_leaf_free_space(struct btrfs_root *root, struct extent_buffer *leaf);
1071 int btrfs_drop_snapshot(struct btrfs_trans_handle *trans, struct btrfs_root
1072                         *root);
1073 /* root-item.c */
1074 int btrfs_del_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1075                    struct btrfs_key *key);
1076 int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root
1077                       *root, struct btrfs_key *key, struct btrfs_root_item
1078                       *item);
1079 int btrfs_update_root(struct btrfs_trans_handle *trans, struct btrfs_root
1080                       *root, struct btrfs_key *key, struct btrfs_root_item
1081                       *item);
1082 int btrfs_find_last_root(struct btrfs_root *root, u64 objectid, struct
1083                          btrfs_root_item *item, struct btrfs_key *key);
1084 int btrfs_find_dead_roots(struct btrfs_root *root, u64 objectid,
1085                           struct btrfs_root *latest_root);
1086 /* dir-item.c */
1087 int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
1088                           *root, const char *name, int name_len, u64 dir,
1089                           struct btrfs_key *location, u8 type);
1090 struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans,
1091                                              struct btrfs_root *root,
1092                                              struct btrfs_path *path, u64 dir,
1093                                              const char *name, int name_len,
1094                                              int mod);
1095 struct btrfs_dir_item *
1096 btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans,
1097                             struct btrfs_root *root,
1098                             struct btrfs_path *path, u64 dir,
1099                             u64 objectid, const char *name, int name_len,
1100                             int mod);
1101 struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_root *root,
1102                               struct btrfs_path *path,
1103                               const char *name, int name_len);
1104 int btrfs_delete_one_dir_name(struct btrfs_trans_handle *trans,
1105                               struct btrfs_root *root,
1106                               struct btrfs_path *path,
1107                               struct btrfs_dir_item *di);
1108 int btrfs_insert_xattr_item(struct btrfs_trans_handle *trans,
1109                             struct btrfs_root *root, const char *name,
1110                             u16 name_len, const void *data, u16 data_len,
1111                             u64 dir);
1112 struct btrfs_dir_item *btrfs_lookup_xattr(struct btrfs_trans_handle *trans,
1113                                           struct btrfs_root *root,
1114                                           struct btrfs_path *path, u64 dir,
1115                                           const char *name, u16 name_len,
1116                                           int mod);
1117 /* inode-map.c */
1118 int btrfs_find_free_objectid(struct btrfs_trans_handle *trans,
1119                              struct btrfs_root *fs_root,
1120                              u64 dirid, u64 *objectid);
1121 int btrfs_find_highest_inode(struct btrfs_root *fs_root, u64 *objectid);
1122
1123 /* inode-item.c */
1124 int btrfs_insert_inode_ref(struct btrfs_trans_handle *trans,
1125                            struct btrfs_root *root,
1126                            const char *name, int name_len,
1127                            u64 inode_objectid, u64 ref_objectid);
1128 int btrfs_del_inode_ref(struct btrfs_trans_handle *trans,
1129                            struct btrfs_root *root,
1130                            const char *name, int name_len,
1131                            u64 inode_objectid, u64 ref_objectid);
1132 int btrfs_insert_empty_inode(struct btrfs_trans_handle *trans,
1133                              struct btrfs_root *root,
1134                              struct btrfs_path *path, u64 objectid);
1135 int btrfs_lookup_inode(struct btrfs_trans_handle *trans, struct btrfs_root
1136                        *root, struct btrfs_path *path,
1137                        struct btrfs_key *location, int mod);
1138
1139 /* file-item.c */
1140 int btrfs_insert_file_extent(struct btrfs_trans_handle *trans,
1141                                struct btrfs_root *root,
1142                                u64 objectid, u64 pos, u64 offset,
1143                                u64 disk_num_bytes,
1144                                u64 num_bytes);
1145 int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
1146                              struct btrfs_root *root,
1147                              struct btrfs_path *path, u64 objectid,
1148                              u64 bytenr, int mod);
1149 int btrfs_csum_file_block(struct btrfs_trans_handle *trans,
1150                           struct btrfs_root *root,
1151                           struct inode *inode,
1152                           u64 objectid, u64 offset,
1153                           char *data, size_t len);
1154 struct btrfs_csum_item *btrfs_lookup_csum(struct btrfs_trans_handle *trans,
1155                                           struct btrfs_root *root,
1156                                           struct btrfs_path *path,
1157                                           u64 objectid, u64 offset,
1158                                           int cow);
1159 int btrfs_csum_truncate(struct btrfs_trans_handle *trans,
1160                         struct btrfs_root *root, struct btrfs_path *path,
1161                         u64 isize);
1162 /* inode.c */
1163 unsigned long btrfs_force_ra(struct address_space *mapping,
1164                               struct file_ra_state *ra, struct file *file,
1165                               pgoff_t offset, pgoff_t last_index);
1166 int btrfs_check_free_space(struct btrfs_root *root, u64 num_required,
1167                            int for_del);
1168 int btrfs_page_mkwrite(struct vm_area_struct *vma, struct page *page);
1169 int btrfs_readpage(struct file *file, struct page *page);
1170 void btrfs_delete_inode(struct inode *inode);
1171 void btrfs_put_inode(struct inode *inode);
1172 void btrfs_read_locked_inode(struct inode *inode);
1173 int btrfs_write_inode(struct inode *inode, int wait);
1174 void btrfs_dirty_inode(struct inode *inode);
1175 struct inode *btrfs_alloc_inode(struct super_block *sb);
1176 void btrfs_destroy_inode(struct inode *inode);
1177 int btrfs_init_cachep(void);
1178 void btrfs_destroy_cachep(void);
1179 long btrfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
1180 struct inode *btrfs_iget_locked(struct super_block *s, u64 objectid,
1181                                 struct btrfs_root *root);
1182 struct inode *btrfs_ilookup(struct super_block *s, u64 objectid,
1183                             u64 root_objectid);
1184 int btrfs_commit_write(struct file *file, struct page *page,
1185                        unsigned from, unsigned to);
1186 struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page,
1187                                     size_t page_offset, u64 start, u64 end,
1188                                     int create);
1189 int btrfs_update_inode(struct btrfs_trans_handle *trans,
1190                               struct btrfs_root *root,
1191                               struct inode *inode);
1192 /* file.c */
1193 int btrfs_drop_extent_cache(struct inode *inode, u64 start, u64 end);
1194 int btrfs_check_file(struct btrfs_root *root, struct inode *inode);
1195 extern struct file_operations btrfs_file_operations;
1196 int btrfs_drop_extents(struct btrfs_trans_handle *trans,
1197                        struct btrfs_root *root, struct inode *inode,
1198                        u64 start, u64 end, u64 inline_limit, u64 *hint_block);
1199 /* tree-defrag.c */
1200 int btrfs_defrag_leaves(struct btrfs_trans_handle *trans,
1201                         struct btrfs_root *root, int cache_only);
1202
1203 /* sysfs.c */
1204 int btrfs_init_sysfs(void);
1205 void btrfs_exit_sysfs(void);
1206 int btrfs_sysfs_add_super(struct btrfs_fs_info *fs);
1207 int btrfs_sysfs_add_root(struct btrfs_root *root);
1208 void btrfs_sysfs_del_root(struct btrfs_root *root);
1209 void btrfs_sysfs_del_super(struct btrfs_fs_info *root);
1210
1211 /* xattr.c */
1212 ssize_t btrfs_listxattr(struct dentry *dentry, char *buffer, size_t size);
1213 int btrfs_delete_xattrs(struct btrfs_trans_handle *trans,
1214                         struct btrfs_root *root, struct inode *inode);
1215 /* super.c */
1216 u64 btrfs_parse_size(char *str);
1217 #endif