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 "_B2RfS_M"
  40
  41 #define BTRFS_MAX_LEVEL 8
  42 #define BTRFS_ROOT_TREE_OBJECTID 1ULL
  43 #define BTRFS_EXTENT_TREE_OBJECTID 2ULL
  44 #define BTRFS_FS_TREE_OBJECTID 3ULL
  45 #define BTRFS_ROOT_TREE_DIR_OBJECTID 4ULL
  46 #define BTRFS_FIRST_FREE_OBJECTID 256ULL
  47
  48 /*
  49  * we can actually store much bigger names, but lets not confuse the rest
  50  * of linux
  51  */
  52 #define BTRFS_NAME_LEN 255
  53
  54 /* 32 bytes in various csum fields */
  55 #define BTRFS_CSUM_SIZE 32
  56 /* four bytes for CRC32 */
  57 #define BTRFS_CRC32_SIZE 4
  58 #define BTRFS_EMPTY_DIR_SIZE 0
  59
  60 #define BTRFS_FT_UNKNOWN        0
  61 #define BTRFS_FT_REG_FILE       1
  62 #define BTRFS_FT_DIR            2
  63 #define BTRFS_FT_CHRDEV         3
  64 #define BTRFS_FT_BLKDEV         4
  65 #define BTRFS_FT_FIFO           5
  66 #define BTRFS_FT_SOCK           6
  67 #define BTRFS_FT_SYMLINK        7
  68 #define BTRFS_FT_XATTR          8
  69 #define BTRFS_FT_MAX            9
  70
  71 /*
  72  * the key defines the order in the tree, and so it also defines (optimal)
  73  * block layout.  objectid corresonds to the inode number.  The flags
  74  * tells us things about the object, and is a kind of stream selector.
  75  * so for a given inode, keys with flags of 1 might refer to the inode
  76  * data, flags of 2 may point to file data in the btree and flags == 3
  77  * may point to extents.
  78  *
  79  * offset is the starting byte offset for this key in the stream.
  80  *
  81  * btrfs_disk_key is in disk byte order.  struct btrfs_key is always
  82  * in cpu native order.  Otherwise they are identical and their sizes
  83  * should be the same (ie both packed)
  84  */
  85 struct btrfs_disk_key {
  86         __le64 objectid;
  87         u8 type;
  88         __le64 offset;
  89 } __attribute__ ((__packed__));
  90
  91 struct btrfs_key {
  92         u64 objectid;
  93         u8 type;
  94         u64 offset;
  95 } __attribute__ ((__packed__));
  96
  97 #define BTRFS_FSID_SIZE 16
  98 /*
  99  * every tree block (leaf or node) starts with this header.
 100  */
 101 struct btrfs_header {
 102         u8 csum[BTRFS_CSUM_SIZE];
 103         u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
 104         __le64 bytenr; /* which block this node is supposed to live in */
 105         __le64 generation;
 106         __le64 owner;
 107         __le32 nritems;
 108         __le16 flags;
 109         u8 level;
 110 } __attribute__ ((__packed__));
 111
 112 #define BTRFS_NODEPTRS_PER_BLOCK(r) (((r)->nodesize - \
 113                                 sizeof(struct btrfs_header)) / \
 114                                 sizeof(struct btrfs_key_ptr))
 115 #define __BTRFS_LEAF_DATA_SIZE(bs) ((bs) - sizeof(struct btrfs_header))
 116 #define BTRFS_LEAF_DATA_SIZE(r) (__BTRFS_LEAF_DATA_SIZE(r->leafsize))
 117 #define BTRFS_MAX_INLINE_DATA_SIZE(r) (BTRFS_LEAF_DATA_SIZE(r) - \
 118                                         sizeof(struct btrfs_item) - \
 119                                         sizeof(struct btrfs_file_extent_item))
 120
 121 /*
 122  * the super block basically lists the main trees of the FS
 123  * it currently lacks any block count etc etc
 124  */
 125 struct btrfs_super_block {
 126         u8 csum[BTRFS_CSUM_SIZE];
 127         /* the first 3 fields must match struct btrfs_header */
 128         u8 fsid[16];    /* FS specific uuid */
 129         __le64 bytenr; /* this block number */
 130         __le64 magic;
 131         __le64 generation;
 132         __le64 root;
 133         __le64 total_bytes;
 134         __le64 bytes_used;
 135         __le64 root_dir_objectid;
 136         __le32 sectorsize;
 137         __le32 nodesize;
 138         __le32 leafsize;
 139         __le32 stripesize;
 140         u8 root_level;
 141 } __attribute__ ((__packed__));
 142
 143 /*
 144  * A leaf is full of items. offset and size tell us where to find
 145  * the item in the leaf (relative to the start of the data area)
 146  */
 147 struct btrfs_item {
 148         struct btrfs_disk_key key;
 149         __le32 offset;
 150         __le32 size;
 151 } __attribute__ ((__packed__));
 152
 153 /*
 154  * leaves have an item area and a data area:
 155  * [item0, item1....itemN] [free space] [dataN...data1, data0]
 156  *
 157  * The data is separate from the items to get the keys closer together
 158  * during searches.
 159  */
 160 struct btrfs_leaf {
 161         struct btrfs_header header;
 162         struct btrfs_item items[];
 163 } __attribute__ ((__packed__));
 164
 165 /*
 166  * all non-leaf blocks are nodes, they hold only keys and pointers to
 167  * other blocks
 168  */
 169 struct btrfs_key_ptr {
 170         struct btrfs_disk_key key;
 171         __le64 blockptr;
 172         __le64 generation;
 173 } __attribute__ ((__packed__));
 174
 175 struct btrfs_node {
 176         struct btrfs_header header;
 177         struct btrfs_key_ptr ptrs[];
 178 } __attribute__ ((__packed__));
 179
 180 /*
 181  * btrfs_paths remember the path taken from the root down to the leaf.
 182  * level 0 is always the leaf, and nodes[1...BTRFS_MAX_LEVEL] will point
 183  * to any other levels that are present.
 184  *
 185  * The slots array records the index of the item or block pointer
 186  * used while walking the tree.
 187  */
 188 struct btrfs_path {
 189         struct extent_buffer *nodes[BTRFS_MAX_LEVEL];
 190         int slots[BTRFS_MAX_LEVEL];
 191         int reada;
 192         int lowest_level;
 193 };
 194
 195 /*
 196  * items in the extent btree are used to record the objectid of the
 197  * owner of the block and the number of references
 198  */
 199 struct btrfs_extent_item {
 200         __le32 refs;
 201 } __attribute__ ((__packed__));
 202
 203 struct btrfs_extent_ref {
 204         __le64 root;
 205         __le64 generation;
 206         __le64 objectid;
 207         __le64 offset;
 208 } __attribute__ ((__packed__));
 209
 210 struct btrfs_inode_ref {
 211         __le16 name_len;
 212         /* name goes here */
 213 } __attribute__ ((__packed__));
 214
 215 struct btrfs_inode_timespec {
 216         __le64 sec;
 217         __le32 nsec;
 218 } __attribute__ ((__packed__));
 219
 220 /*
 221  * there is no padding here on purpose.  If you want to extent the inode,
 222  * make a new item type
 223  */
 224 struct btrfs_inode_item {
 225         __le64 generation;
 226         __le64 size;
 227         __le64 nblocks;
 228         __le64 block_group;
 229         __le32 nlink;
 230         __le32 uid;
 231         __le32 gid;
 232         __le32 mode;
 233         __le32 rdev;
 234         __le16 flags;
 235         __le16 compat_flags;
 236         struct btrfs_inode_timespec atime;
 237         struct btrfs_inode_timespec ctime;
 238         struct btrfs_inode_timespec mtime;
 239         struct btrfs_inode_timespec otime;
 240 } __attribute__ ((__packed__));
 241
 242 struct btrfs_dir_item {
 243         struct btrfs_disk_key location;
 244         __le16 data_len;
 245         __le16 name_len;
 246         u8 type;
 247 } __attribute__ ((__packed__));
 248
 249 struct btrfs_root_item {
 250         struct btrfs_inode_item inode;
 251         __le64 root_dirid;
 252         __le64 bytenr;
 253         __le64 byte_limit;
 254         __le64 bytes_used;
 255         __le32 flags;
 256         __le32 refs;
 257         struct btrfs_disk_key drop_progress;
 258         u8 drop_level;
 259         u8 level;
 260 } __attribute__ ((__packed__));
 261
 262 #define BTRFS_FILE_EXTENT_REG 0
 263 #define BTRFS_FILE_EXTENT_INLINE 1
 264
 265 struct btrfs_file_extent_item {
 266         __le64 generation;
 267         u8 type;
 268         /*
 269          * disk space consumed by the extent, checksum blocks are included
 270          * in these numbers
 271          */
 272         __le64 disk_bytenr;
 273         __le64 disk_num_bytes;
 274         /*
 275          * the logical offset in file blocks (no csums)
 276          * this extent record is for.  This allows a file extent to point
 277          * into the middle of an existing extent on disk, sharing it
 278          * between two snapshots (useful if some bytes in the middle of the
 279          * extent have changed
 280          */
 281         __le64 offset;
 282         /*
 283          * the logical number of file blocks (no csums included)
 284          */
 285         __le64 num_bytes;
 286 } __attribute__ ((__packed__));
 287
 288 struct btrfs_csum_item {
 289         u8 csum;
 290 } __attribute__ ((__packed__));
 291
 292 /* tag for the radix tree of block groups in ram */
 293 #define BTRFS_BLOCK_GROUP_SIZE (256 * 1024 * 1024)
 294
 295
 296 #define BTRFS_BLOCK_GROUP_DATA 1
 297 #define BTRFS_BLOCK_GROUP_MIXED 2
 298
 299 struct btrfs_block_group_item {
 300         __le64 used;
 301         u8 flags;
 302 } __attribute__ ((__packed__));
 303
 304 struct btrfs_block_group_cache {
 305         struct btrfs_key key;
 306         struct btrfs_block_group_item item;
 307         int data;
 308         int cached;
 309         u64 pinned;
 310 };
 311 struct btrfs_fs_info {
 312         u8 fsid[BTRFS_FSID_SIZE];
 313         struct btrfs_root *extent_root;
 314         struct btrfs_root *tree_root;
 315         struct radix_tree_root fs_roots_radix;
 316
 317         struct extent_map_tree free_space_cache;
 318         struct extent_map_tree block_group_cache;
 319         struct extent_map_tree pinned_extents;
 320         struct extent_map_tree pending_del;
 321         struct extent_map_tree extent_ins;
 322
 323         u64 generation;
 324         u64 last_trans_committed;
 325         unsigned long mount_opt;
 326         u64 max_extent;
 327         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         u64 delalloc_bytes;
 353 };
 354 /*
 355  * in ram representation of the tree.  extent_root is used for all allocations
 356  * and for the extent tree extent_root root.
 357  */
 358 struct btrfs_root {
 359         struct extent_buffer *node;
 360         struct extent_buffer *commit_root;
 361         struct btrfs_root_item root_item;
 362         struct btrfs_key root_key;
 363         struct btrfs_fs_info *fs_info;
 364         struct inode *inode;
 365         struct kobject root_kobj;
 366         struct completion kobj_unregister;
 367         u64 objectid;
 368         u64 last_trans;
 369
 370         /* data allocations are done in sectorsize units */
 371         u32 sectorsize;
 372
 373         /* node allocations are done in nodesize units */
 374         u32 nodesize;
 375
 376         /* leaf allocations are done in leafsize units */
 377         u32 leafsize;
 378
 379         u32 stripesize;
 380
 381         u32 type;
 382         u64 highest_inode;
 383         u64 last_inode_alloc;
 384         int ref_cows;
 385         struct btrfs_key defrag_progress;
 386         int defrag_running;
 387         int defrag_level;
 388         char *name;
 389         int in_sysfs;
 390 };
 391
 392 /*
 393  * inode items have the data typically returned from stat and store other
 394  * info about object characteristics.  There is one for every file and dir in
 395  * the FS
 396  */
 397 #define BTRFS_INODE_ITEM_KEY            1
 398 #define BTRFS_INODE_REF_KEY             2
 399 #define BTRFS_XATTR_ITEM_KEY            8
 400 /* reserve 2-15 close to the inode for later flexibility */
 401
 402 /*
 403  * dir items are the name -> inode pointers in a directory.  There is one
 404  * for every name in a directory.
 405  */
 406 #define BTRFS_DIR_ITEM_KEY      16
 407 #define BTRFS_DIR_INDEX_KEY     17
 408 /*
 409  * extent data is for file data
 410  */
 411 #define BTRFS_EXTENT_DATA_KEY   18
 412 /*
 413  * csum items have the checksums for data in the extents
 414  */
 415 #define BTRFS_CSUM_ITEM_KEY     19
 416
 417 /* reserve 20-31 for other file stuff */
 418
 419 /*
 420  * root items point to tree roots.  There are typically in the root
 421  * tree used by the super block to find all the other trees
 422  */
 423 #define BTRFS_ROOT_ITEM_KEY     32
 424 /*
 425  * extent items are in the extent map tree.  These record which blocks
 426  * are used, and how many references there are to each block
 427  */
 428 #define BTRFS_EXTENT_ITEM_KEY   33
 429 #define BTRFS_EXTENT_REF_KEY    34
 430
 431 /*
 432  * block groups give us hints into the extent allocation trees.  Which
 433  * blocks are free etc etc
 434  */
 435 #define BTRFS_BLOCK_GROUP_ITEM_KEY 50
 436
 437 /*
 438  * string items are for debugging.  They just store a short string of
 439  * data in the FS
 440  */
 441 #define BTRFS_STRING_ITEM_KEY   253
 442
 443 #define BTRFS_MOUNT_NODATASUM           0x1
 444 #define BTRFS_MOUNT_NODATACOW           0x2
 445
 446 #define btrfs_clear_opt(o, opt)         ((o) &= ~BTRFS_MOUNT_##opt)
 447 #define btrfs_set_opt(o, opt)           ((o) |= BTRFS_MOUNT_##opt)
 448 #define btrfs_test_opt(root, opt)       ((root)->fs_info->mount_opt & \
 449                                          BTRFS_MOUNT_##opt)
 450 /*
 451  * Inode flags
 452  */
 453 #define BTRFS_INODE_NODATASUM           0x1
 454 #define BTRFS_INODE_NODATACOW           0x2
 455
 456 #define btrfs_clear_flag(inode, flag)   (BTRFS_I(inode)->flags &= \
 457                                          ~BTRFS_INODE_##flag)
 458 #define btrfs_set_flag(inode, flag)     (BTRFS_I(inode)->flags |= \
 459                                          BTRFS_INODE_##flag)
 460 #define btrfs_test_flag(inode, flag)    (BTRFS_I(inode)->flags & \
 461                                          BTRFS_INODE_##flag)
 462 /* some macros to generate set/get funcs for the struct fields.  This
 463  * assumes there is a lefoo_to_cpu for every type, so lets make a simple
 464  * one for u8:
 465  */
 466 #define le8_to_cpu(v) (v)
 467 #define cpu_to_le8(v) (v)
 468 #define __le8 u8
 469
 470 #define read_eb_member(eb, ptr, type, member, result) (                 \
 471         read_extent_buffer(eb, (char *)(result),                        \
 472                            ((unsigned long)(ptr)) +                     \
 473                             offsetof(type, member),                     \
 474                            sizeof(((type *)0)->member)))
 475
 476 #define write_eb_member(eb, ptr, type, member, result) (                \
 477         write_extent_buffer(eb, (char *)(result),                       \
 478                            ((unsigned long)(ptr)) +                     \
 479                             offsetof(type, member),                     \
 480                            sizeof(((type *)0)->member)))
 481
 482 #ifndef BTRFS_SETGET_FUNCS
 483 #define BTRFS_SETGET_FUNCS(name, type, member, bits)                    \
 484 u##bits btrfs_##name(struct extent_buffer *eb, type *s);                \
 485 void btrfs_set_##name(struct extent_buffer *eb, type *s, u##bits val);
 486 #endif
 487
 488 #define BTRFS_SETGET_HEADER_FUNCS(name, type, member, bits)             \
 489 static inline u##bits btrfs_##name(struct extent_buffer *eb)            \
 490 {                                                                       \
 491         char *kaddr = kmap_atomic(eb->first_page, KM_USER0);            \
 492         unsigned long offset = offsetof(type, member);                  \
 493         u##bits res;                                                    \
 494         __le##bits *tmp = (__le##bits *)(kaddr + offset);               \
 495         res = le##bits##_to_cpu(*tmp);                                  \
 496         kunmap_atomic(kaddr, KM_USER0);                                 \
 497         return res;                                                     \
 498 }                                                                       \
 499 static inline void btrfs_set_##name(struct extent_buffer *eb,           \
 500                                     u##bits val)                        \
 501 {                                                                       \
 502         char *kaddr = kmap_atomic(eb->first_page, KM_USER0);            \
 503         unsigned long offset = offsetof(type, member);                  \
 504         __le##bits *tmp = (__le##bits *)(kaddr + offset);               \
 505         *tmp = cpu_to_le##bits(val);                                    \
 506         kunmap_atomic(kaddr, KM_USER0);                                 \
 507 }
 508
 509 #define BTRFS_SETGET_STACK_FUNCS(name, type, member, bits)              \
 510 static inline u##bits btrfs_##name(type *s)                             \
 511 {                                                                       \
 512         return le##bits##_to_cpu(s->member);                            \
 513 }                                                                       \
 514 static inline void btrfs_set_##name(type *s, u##bits val)               \
 515 {                                                                       \
 516         s->member = cpu_to_le##bits(val);                               \
 517 }
 518
 519 /* struct btrfs_block_group_item */
 520 BTRFS_SETGET_STACK_FUNCS(block_group_used, struct btrfs_block_group_item,
 521                          used, 64);
 522 BTRFS_SETGET_FUNCS(disk_block_group_used, struct btrfs_block_group_item,
 523                          used, 64);
 524 BTRFS_SETGET_FUNCS(disk_block_group_flags, struct btrfs_block_group_item,
 525                    flags, 8);
 526
 527 /* struct btrfs_inode_ref */
 528 BTRFS_SETGET_FUNCS(inode_ref_name_len, struct btrfs_inode_ref, name_len, 16);
 529
 530 /* struct btrfs_inode_item */
 531 BTRFS_SETGET_FUNCS(inode_generation, struct btrfs_inode_item, generation, 64);
 532 BTRFS_SETGET_FUNCS(inode_size, struct btrfs_inode_item, size, 64);
 533 BTRFS_SETGET_FUNCS(inode_nblocks, struct btrfs_inode_item, nblocks, 64);
 534 BTRFS_SETGET_FUNCS(inode_block_group, struct btrfs_inode_item, block_group, 64);
 535 BTRFS_SETGET_FUNCS(inode_nlink, struct btrfs_inode_item, nlink, 32);
 536 BTRFS_SETGET_FUNCS(inode_uid, struct btrfs_inode_item, uid, 32);
 537 BTRFS_SETGET_FUNCS(inode_gid, struct btrfs_inode_item, gid, 32);
 538 BTRFS_SETGET_FUNCS(inode_mode, struct btrfs_inode_item, mode, 32);
 539 BTRFS_SETGET_FUNCS(inode_rdev, struct btrfs_inode_item, rdev, 32);
 540 BTRFS_SETGET_FUNCS(inode_flags, struct btrfs_inode_item, flags, 16);
 541 BTRFS_SETGET_FUNCS(inode_compat_flags, struct btrfs_inode_item,
 542                    compat_flags, 16);
 543
 544 static inline struct btrfs_inode_timespec *
 545 btrfs_inode_atime(struct btrfs_inode_item *inode_item)
 546 {
 547         unsigned long ptr = (unsigned long)inode_item;
 548         ptr += offsetof(struct btrfs_inode_item, atime);
 549         return (struct btrfs_inode_timespec *)ptr;
 550 }
 551
 552 static inline struct btrfs_inode_timespec *
 553 btrfs_inode_mtime(struct btrfs_inode_item *inode_item)
 554 {
 555         unsigned long ptr = (unsigned long)inode_item;
 556         ptr += offsetof(struct btrfs_inode_item, mtime);
 557         return (struct btrfs_inode_timespec *)ptr;
 558 }
 559
 560 static inline struct btrfs_inode_timespec *
 561 btrfs_inode_ctime(struct btrfs_inode_item *inode_item)
 562 {
 563         unsigned long ptr = (unsigned long)inode_item;
 564         ptr += offsetof(struct btrfs_inode_item, ctime);
 565         return (struct btrfs_inode_timespec *)ptr;
 566 }
 567
 568 static inline struct btrfs_inode_timespec *
 569 btrfs_inode_otime(struct btrfs_inode_item *inode_item)
 570 {
 571         unsigned long ptr = (unsigned long)inode_item;
 572         ptr += offsetof(struct btrfs_inode_item, otime);
 573         return (struct btrfs_inode_timespec *)ptr;
 574 }
 575
 576 BTRFS_SETGET_FUNCS(timespec_sec, struct btrfs_inode_timespec, sec, 64);
 577 BTRFS_SETGET_FUNCS(timespec_nsec, struct btrfs_inode_timespec, nsec, 32);
 578
 579 /* struct btrfs_extent_item */
 580 BTRFS_SETGET_FUNCS(extent_refs, struct btrfs_extent_item, refs, 32);
 581
 582 /* struct btrfs_extent_ref */
 583 BTRFS_SETGET_FUNCS(ref_root, struct btrfs_extent_ref, root, 64);
 584 BTRFS_SETGET_FUNCS(ref_generation, struct btrfs_extent_ref, generation, 64);
 585 BTRFS_SETGET_FUNCS(ref_objectid, struct btrfs_extent_ref, objectid, 64);
 586 BTRFS_SETGET_FUNCS(ref_offset, struct btrfs_extent_ref, offset, 64);
 587
 588 BTRFS_SETGET_STACK_FUNCS(stack_ref_root, struct btrfs_extent_ref, root, 64);
 589 BTRFS_SETGET_STACK_FUNCS(stack_ref_generation, struct btrfs_extent_ref,
 590                          generation, 64);
 591 BTRFS_SETGET_STACK_FUNCS(stack_ref_objectid, struct btrfs_extent_ref,
 592                          objectid, 64);
 593 BTRFS_SETGET_STACK_FUNCS(stack_ref_offset, struct btrfs_extent_ref, offset, 64);
 594
 595 BTRFS_SETGET_STACK_FUNCS(stack_extent_refs, struct btrfs_extent_item,
 596                          refs, 32);
 597
 598 /* struct btrfs_node */
 599 BTRFS_SETGET_FUNCS(key_blockptr, struct btrfs_key_ptr, blockptr, 64);
 600 BTRFS_SETGET_FUNCS(key_generation, struct btrfs_key_ptr, generation, 64);
 601
 602 static inline u64 btrfs_node_blockptr(struct extent_buffer *eb, int nr)
 603 {
 604         unsigned long ptr;
 605         ptr = offsetof(struct btrfs_node, ptrs) +
 606                 sizeof(struct btrfs_key_ptr) * nr;
 607         return btrfs_key_blockptr(eb, (struct btrfs_key_ptr *)ptr);
 608 }
 609
 610 static inline void btrfs_set_node_blockptr(struct extent_buffer *eb,
 611                                            int nr, u64 val)
 612 {
 613         unsigned long ptr;
 614         ptr = offsetof(struct btrfs_node, ptrs) +
 615                 sizeof(struct btrfs_key_ptr) * nr;
 616         btrfs_set_key_blockptr(eb, (struct btrfs_key_ptr *)ptr, val);
 617 }
 618
 619 static inline u64 btrfs_node_ptr_generation(struct extent_buffer *eb, int nr)
 620 {
 621         unsigned long ptr;
 622         ptr = offsetof(struct btrfs_node, ptrs) +
 623                 sizeof(struct btrfs_key_ptr) * nr;
 624         return btrfs_key_generation(eb, (struct btrfs_key_ptr *)ptr);
 625 }
 626
 627 static inline void btrfs_set_node_ptr_generation(struct extent_buffer *eb,
 628                                                  int nr, u64 val)
 629 {
 630         unsigned long ptr;
 631         ptr = offsetof(struct btrfs_node, ptrs) +
 632                 sizeof(struct btrfs_key_ptr) * nr;
 633         btrfs_set_key_generation(eb, (struct btrfs_key_ptr *)ptr, val);
 634 }
 635
 636 static inline unsigned long btrfs_node_key_ptr_offset(int nr)
 637 {
 638         return offsetof(struct btrfs_node, ptrs) +
 639                 sizeof(struct btrfs_key_ptr) * nr;
 640 }
 641
 642 void btrfs_node_key(struct extent_buffer *eb,
 643                     struct btrfs_disk_key *disk_key, int nr);
 644
 645 static inline void btrfs_set_node_key(struct extent_buffer *eb,
 646                                       struct btrfs_disk_key *disk_key, int nr)
 647 {
 648         unsigned long ptr;
 649         ptr = btrfs_node_key_ptr_offset(nr);
 650         write_eb_member(eb, (struct btrfs_key_ptr *)ptr,
 651                        struct btrfs_key_ptr, key, disk_key);
 652 }
 653
 654 /* struct btrfs_item */
 655 BTRFS_SETGET_FUNCS(item_offset, struct btrfs_item, offset, 32);
 656 BTRFS_SETGET_FUNCS(item_size, struct btrfs_item, size, 32);
 657
 658 static inline unsigned long btrfs_item_nr_offset(int nr)
 659 {
 660         return offsetof(struct btrfs_leaf, items) +
 661                 sizeof(struct btrfs_item) * nr;
 662 }
 663
 664 static inline struct btrfs_item *btrfs_item_nr(struct extent_buffer *eb,
 665                                                int nr)
 666 {
 667         return (struct btrfs_item *)btrfs_item_nr_offset(nr);
 668 }
 669
 670 static inline u32 btrfs_item_end(struct extent_buffer *eb,
 671                                  struct btrfs_item *item)
 672 {
 673         return btrfs_item_offset(eb, item) + btrfs_item_size(eb, item);
 674 }
 675
 676 static inline u32 btrfs_item_end_nr(struct extent_buffer *eb, int nr)
 677 {
 678         return btrfs_item_end(eb, btrfs_item_nr(eb, nr));
 679 }
 680
 681 static inline u32 btrfs_item_offset_nr(struct extent_buffer *eb, int nr)
 682 {
 683         return btrfs_item_offset(eb, btrfs_item_nr(eb, nr));
 684 }
 685
 686 static inline u32 btrfs_item_size_nr(struct extent_buffer *eb, int nr)
 687 {
 688         return btrfs_item_size(eb, btrfs_item_nr(eb, nr));
 689 }
 690
 691 static inline void btrfs_item_key(struct extent_buffer *eb,
 692                            struct btrfs_disk_key *disk_key, int nr)
 693 {
 694         struct btrfs_item *item = btrfs_item_nr(eb, nr);
 695         read_eb_member(eb, item, struct btrfs_item, key, disk_key);
 696 }
 697
 698 static inline void btrfs_set_item_key(struct extent_buffer *eb,
 699                                struct btrfs_disk_key *disk_key, int nr)
 700 {
 701         struct btrfs_item *item = btrfs_item_nr(eb, nr);
 702         write_eb_member(eb, item, struct btrfs_item, key, disk_key);
 703 }
 704
 705 /* struct btrfs_dir_item */
 706 BTRFS_SETGET_FUNCS(dir_data_len, struct btrfs_dir_item, data_len, 16);
 707 BTRFS_SETGET_FUNCS(dir_type, struct btrfs_dir_item, type, 8);
 708 BTRFS_SETGET_FUNCS(dir_name_len, struct btrfs_dir_item, name_len, 16);
 709
 710 static inline void btrfs_dir_item_key(struct extent_buffer *eb,
 711                                       struct btrfs_dir_item *item,
 712                                       struct btrfs_disk_key *key)
 713 {
 714         read_eb_member(eb, item, struct btrfs_dir_item, location, key);
 715 }
 716
 717 static inline void btrfs_set_dir_item_key(struct extent_buffer *eb,
 718                                           struct btrfs_dir_item *item,
 719                                           struct btrfs_disk_key *key)
 720 {
 721         write_eb_member(eb, item, struct btrfs_dir_item, location, key);
 722 }
 723
 724 /* struct btrfs_disk_key */
 725 BTRFS_SETGET_STACK_FUNCS(disk_key_objectid, struct btrfs_disk_key,
 726                          objectid, 64);
 727 BTRFS_SETGET_STACK_FUNCS(disk_key_offset, struct btrfs_disk_key, offset, 64);
 728 BTRFS_SETGET_STACK_FUNCS(disk_key_type, struct btrfs_disk_key, type, 8);
 729
 730 static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu,
 731                                          struct btrfs_disk_key *disk)
 732 {
 733         cpu->offset = le64_to_cpu(disk->offset);
 734         cpu->type = disk->type;
 735         cpu->objectid = le64_to_cpu(disk->objectid);
 736 }
 737
 738 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk,
 739                                          struct btrfs_key *cpu)
 740 {
 741         disk->offset = cpu_to_le64(cpu->offset);
 742         disk->type = cpu->type;
 743         disk->objectid = cpu_to_le64(cpu->objectid);
 744 }
 745
 746 static inline void btrfs_node_key_to_cpu(struct extent_buffer *eb,
 747                                   struct btrfs_key *key, int nr)
 748 {
 749         struct btrfs_disk_key disk_key;
 750         btrfs_node_key(eb, &disk_key, nr);
 751         btrfs_disk_key_to_cpu(key, &disk_key);
 752 }
 753
 754 static inline void btrfs_item_key_to_cpu(struct extent_buffer *eb,
 755                                   struct btrfs_key *key, int nr)
 756 {
 757         struct btrfs_disk_key disk_key;
 758         btrfs_item_key(eb, &disk_key, nr);
 759         btrfs_disk_key_to_cpu(key, &disk_key);
 760 }
 761
 762 static inline void btrfs_dir_item_key_to_cpu(struct extent_buffer *eb,
 763                                       struct btrfs_dir_item *item,
 764                                       struct btrfs_key *key)
 765 {
 766         struct btrfs_disk_key disk_key;
 767         btrfs_dir_item_key(eb, item, &disk_key);
 768         btrfs_disk_key_to_cpu(key, &disk_key);
 769 }
 770
 771
 772 static inline u8 btrfs_key_type(struct btrfs_key *key)
 773 {
 774         return key->type;
 775 }
 776
 777 static inline void btrfs_set_key_type(struct btrfs_key *key, u8 val)
 778 {
 779         key->type = val;
 780 }
 781
 782 /* struct btrfs_header */
 783 BTRFS_SETGET_HEADER_FUNCS(header_bytenr, struct btrfs_header, bytenr, 64);
 784 BTRFS_SETGET_HEADER_FUNCS(header_generation, struct btrfs_header,
 785                           generation, 64);
 786 BTRFS_SETGET_HEADER_FUNCS(header_owner, struct btrfs_header, owner, 64);
 787 BTRFS_SETGET_HEADER_FUNCS(header_nritems, struct btrfs_header, nritems, 32);
 788 BTRFS_SETGET_HEADER_FUNCS(header_flags, struct btrfs_header, flags, 16);
 789 BTRFS_SETGET_HEADER_FUNCS(header_level, struct btrfs_header, level, 8);
 790
 791 static inline u8 *btrfs_header_fsid(struct extent_buffer *eb)
 792 {
 793         unsigned long ptr = offsetof(struct btrfs_header, fsid);
 794         return (u8 *)ptr;
 795 }
 796
 797 static inline u8 *btrfs_super_fsid(struct extent_buffer *eb)
 798 {
 799         unsigned long ptr = offsetof(struct btrfs_super_block, fsid);
 800         return (u8 *)ptr;
 801 }
 802
 803 static inline u8 *btrfs_header_csum(struct extent_buffer *eb)
 804 {
 805         unsigned long ptr = offsetof(struct btrfs_header, csum);
 806         return (u8 *)ptr;
 807 }
 808
 809 static inline struct btrfs_node *btrfs_buffer_node(struct extent_buffer *eb)
 810 {
 811         return NULL;
 812 }
 813
 814 static inline struct btrfs_leaf *btrfs_buffer_leaf(struct extent_buffer *eb)
 815 {
 816         return NULL;
 817 }
 818
 819 static inline struct btrfs_header *btrfs_buffer_header(struct extent_buffer *eb)
 820 {
 821         return NULL;
 822 }
 823
 824 static inline int btrfs_is_leaf(struct extent_buffer *eb)
 825 {
 826         return (btrfs_header_level(eb) == 0);
 827 }
 828
 829 /* struct btrfs_root_item */
 830 BTRFS_SETGET_FUNCS(disk_root_refs, struct btrfs_root_item, refs, 32);
 831 BTRFS_SETGET_FUNCS(disk_root_bytenr, struct btrfs_root_item, bytenr, 64);
 832 BTRFS_SETGET_FUNCS(disk_root_level, struct btrfs_root_item, level, 8);
 833
 834 BTRFS_SETGET_STACK_FUNCS(root_bytenr, struct btrfs_root_item, bytenr, 64);
 835 BTRFS_SETGET_STACK_FUNCS(root_level, struct btrfs_root_item, level, 8);
 836 BTRFS_SETGET_STACK_FUNCS(root_dirid, struct btrfs_root_item, root_dirid, 64);
 837 BTRFS_SETGET_STACK_FUNCS(root_refs, struct btrfs_root_item, refs, 32);
 838 BTRFS_SETGET_STACK_FUNCS(root_flags, struct btrfs_root_item, flags, 32);
 839 BTRFS_SETGET_STACK_FUNCS(root_used, struct btrfs_root_item, bytes_used, 64);
 840 BTRFS_SETGET_STACK_FUNCS(root_limit, struct btrfs_root_item, byte_limit, 64);
 841
 842 /* struct btrfs_super_block */
 843 BTRFS_SETGET_STACK_FUNCS(super_bytenr, struct btrfs_super_block, bytenr, 64);
 844 BTRFS_SETGET_STACK_FUNCS(super_generation, struct btrfs_super_block,
 845                          generation, 64);
 846 BTRFS_SETGET_STACK_FUNCS(super_root, struct btrfs_super_block, root, 64);
 847 BTRFS_SETGET_STACK_FUNCS(super_root_level, struct btrfs_super_block,
 848                          root_level, 8);
 849 BTRFS_SETGET_STACK_FUNCS(super_total_bytes, struct btrfs_super_block,
 850                          total_bytes, 64);
 851 BTRFS_SETGET_STACK_FUNCS(super_bytes_used, struct btrfs_super_block,
 852                          bytes_used, 64);
 853 BTRFS_SETGET_STACK_FUNCS(super_sectorsize, struct btrfs_super_block,
 854                          sectorsize, 32);
 855 BTRFS_SETGET_STACK_FUNCS(super_nodesize, struct btrfs_super_block,
 856                          nodesize, 32);
 857 BTRFS_SETGET_STACK_FUNCS(super_leafsize, struct btrfs_super_block,
 858                          leafsize, 32);
 859 BTRFS_SETGET_STACK_FUNCS(super_stripesize, struct btrfs_super_block,
 860                          stripesize, 32);
 861 BTRFS_SETGET_STACK_FUNCS(super_root_dir, struct btrfs_super_block,
 862                          root_dir_objectid, 64);
 863
 864 static inline unsigned long btrfs_leaf_data(struct extent_buffer *l)
 865 {
 866         return offsetof(struct btrfs_leaf, items);
 867 }
 868
 869 /* struct btrfs_file_extent_item */
 870 BTRFS_SETGET_FUNCS(file_extent_type, struct btrfs_file_extent_item, type, 8);
 871
 872 static inline unsigned long btrfs_file_extent_inline_start(struct
 873                                                    btrfs_file_extent_item *e)
 874 {
 875         unsigned long offset = (unsigned long)e;
 876         offset += offsetof(struct btrfs_file_extent_item, disk_bytenr);
 877         return offset;
 878 }
 879
 880 static inline u32 btrfs_file_extent_calc_inline_size(u32 datasize)
 881 {
 882         return offsetof(struct btrfs_file_extent_item, disk_bytenr) + datasize;
 883 }
 884
 885 static inline u32 btrfs_file_extent_inline_len(struct extent_buffer *eb,
 886                                                struct btrfs_item *e)
 887 {
 888         unsigned long offset;
 889         offset = offsetof(struct btrfs_file_extent_item, disk_bytenr);
 890         return btrfs_item_size(eb, e) - offset;
 891 }
 892
 893 BTRFS_SETGET_FUNCS(file_extent_disk_bytenr, struct btrfs_file_extent_item,
 894                    disk_bytenr, 64);
 895 BTRFS_SETGET_FUNCS(file_extent_generation, struct btrfs_file_extent_item,
 896                    generation, 64);
 897 BTRFS_SETGET_FUNCS(file_extent_disk_num_bytes, struct btrfs_file_extent_item,
 898                    disk_num_bytes, 64);
 899 BTRFS_SETGET_FUNCS(file_extent_offset, struct btrfs_file_extent_item,
 900                   offset, 64);
 901 BTRFS_SETGET_FUNCS(file_extent_num_bytes, struct btrfs_file_extent_item,
 902                    num_bytes, 64);
 903
 904 static inline struct btrfs_root *btrfs_sb(struct super_block *sb)
 905 {
 906         return sb->s_fs_info;
 907 }
 908
 909 static inline int btrfs_set_root_name(struct btrfs_root *root,
 910                                       const char *name, int len)
 911 {
 912         /* if we already have a name just free it */
 913         if (root->name)
 914                 kfree(root->name);
 915
 916         root->name = kmalloc(len+1, GFP_KERNEL);
 917         if (!root->name)
 918                 return -ENOMEM;
 919
 920         memcpy(root->name, name, len);
 921         root->name[len] ='\0';
 922
 923         return 0;
 924 }
 925
 926 static inline u32 btrfs_level_size(struct btrfs_root *root, int level) {
 927         if (level == 0)
 928                 return root->leafsize;
 929         return root->nodesize;
 930 }
 931
 932 /* helper function to cast into the data area of the leaf. */
 933 #define btrfs_item_ptr(leaf, slot, type) \
 934         ((type *)(btrfs_leaf_data(leaf) + \
 935         btrfs_item_offset_nr(leaf, slot)))
 936
 937 #define btrfs_item_ptr_offset(leaf, slot) \
 938         ((unsigned long)(btrfs_leaf_data(leaf) + \
 939         btrfs_item_offset_nr(leaf, slot)))
 940
 941 static inline struct dentry *fdentry(struct file *file) {
 942 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
 943         return file->f_dentry;
 944 #else
 945         return file->f_path.dentry;
 946 #endif
 947 }
 948
 949 /* extent-tree.c */
 950 u32 btrfs_count_snapshots_in_path(struct btrfs_root *root,
 951                                   struct btrfs_path *count_path,
 952                                   u64 first_extent);
 953 int btrfs_extent_post_op(struct btrfs_trans_handle *trans,
 954                          struct btrfs_root *root);
 955 int btrfs_copy_pinned(struct btrfs_root *root, struct extent_map_tree *copy);
 956 struct btrfs_block_group_cache *btrfs_lookup_block_group(struct
 957                                                          btrfs_fs_info *info,
 958                                                          u64 bytenr);
 959 struct btrfs_block_group_cache *btrfs_find_block_group(struct btrfs_root *root,
 960                                                  struct btrfs_block_group_cache
 961                                                  *hint, u64 search_start,
 962                                                  int data, int owner);
 963 int btrfs_inc_root_ref(struct btrfs_trans_handle *trans,
 964                        struct btrfs_root *root, u64 owner_objectid);
 965 struct extent_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
 966                                             struct btrfs_root *root, u32 size,
 967                                             u64 root_objectid,
 968                                             u64 hint, u64 empty_size);
 969 struct extent_buffer *__btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
 970                                              struct btrfs_root *root,
 971                                              u32 blocksize,
 972                                              u64 root_objectid,
 973                                              u64 ref_generation,
 974                                              u64 first_objectid,
 975                                              int level,
 976                                              u64 hint,
 977                                              u64 empty_size);
 978 int btrfs_grow_extent_tree(struct btrfs_trans_handle *trans,
 979                            struct btrfs_root *root, u64 new_size);
 980 int btrfs_shrink_extent_tree(struct btrfs_root *root, u64 new_size);
 981 int btrfs_insert_extent_backref(struct btrfs_trans_handle *trans,
 982                                  struct btrfs_root *root,
 983                                  struct btrfs_path *path, u64 bytenr,
 984                                  u64 root_objectid, u64 ref_generation,
 985                                  u64 owner, u64 owner_offset);
 986 int btrfs_alloc_extent(struct btrfs_trans_handle *trans,
 987                        struct btrfs_root *root,
 988                        u64 num_bytes, u64 root_objectid, u64 ref_generation,
 989                        u64 owner, u64 owner_offset,
 990                        u64 empty_size, u64 hint_byte,
 991                        u64 search_end, struct btrfs_key *ins, int data);
 992 int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
 993                   struct extent_buffer *buf);
 994 int btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
 995                       *root, u64 bytenr, u64 num_bytes,
 996                       u64 root_objectid, u64 ref_generation,
 997                       u64 owner_objectid, u64 owner_offset, int pin);
 998 int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans,
 999                                struct btrfs_root *root,
1000                                struct extent_map_tree *unpin);
1001 int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
1002                                 struct btrfs_root *root,
1003                                 u64 bytenr, u64 num_bytes,
1004                                 u64 root_objectid, u64 ref_generation,
1005                                 u64 owner, u64 owner_offset);
1006 int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans,
1007                                     struct btrfs_root *root);
1008 int btrfs_free_block_groups(struct btrfs_fs_info *info);
1009 int btrfs_read_block_groups(struct btrfs_root *root);
1010 /* ctree.c */
1011 int btrfs_cow_block(struct btrfs_trans_handle *trans,
1012                     struct btrfs_root *root, struct extent_buffer *buf,
1013                     struct extent_buffer *parent, int parent_slot,
1014                     struct extent_buffer **cow_ret);
1015 int btrfs_copy_root(struct btrfs_trans_handle *trans,
1016                       struct btrfs_root *root,
1017                       struct extent_buffer *buf,
1018                       struct extent_buffer **cow_ret, u64 new_root_objectid);
1019 int btrfs_extend_item(struct btrfs_trans_handle *trans, struct btrfs_root
1020                       *root, struct btrfs_path *path, u32 data_size);
1021 int btrfs_truncate_item(struct btrfs_trans_handle *trans,
1022                         struct btrfs_root *root,
1023                         struct btrfs_path *path,
1024                         u32 new_size, int from_end);
1025 int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root
1026                       *root, struct btrfs_key *key, struct btrfs_path *p, int
1027                       ins_len, int cow);
1028 int btrfs_realloc_node(struct btrfs_trans_handle *trans,
1029                        struct btrfs_root *root, struct extent_buffer *parent,
1030                        int start_slot, int cache_only, u64 *last_ret,
1031                        struct btrfs_key *progress);
1032 void btrfs_release_path(struct btrfs_root *root, struct btrfs_path *p);
1033 struct btrfs_path *btrfs_alloc_path(void);
1034 void btrfs_free_path(struct btrfs_path *p);
1035 void btrfs_init_path(struct btrfs_path *p);
1036 int btrfs_del_item(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1037                    struct btrfs_path *path);
1038 int btrfs_insert_item(struct btrfs_trans_handle *trans, struct btrfs_root
1039                       *root, struct btrfs_key *key, void *data, u32 data_size);
1040 int btrfs_insert_empty_item(struct btrfs_trans_handle *trans, struct btrfs_root
1041                             *root, struct btrfs_path *path, struct btrfs_key
1042                             *cpu_key, u32 data_size);
1043 int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path);
1044 int btrfs_prev_leaf(struct btrfs_root *root, struct btrfs_path *path);
1045 int btrfs_leaf_free_space(struct btrfs_root *root, struct extent_buffer *leaf);
1046 int btrfs_drop_snapshot(struct btrfs_trans_handle *trans, struct btrfs_root
1047                         *root);
1048 /* root-item.c */
1049 int btrfs_del_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1050                    struct btrfs_key *key);
1051 int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root
1052                       *root, struct btrfs_key *key, struct btrfs_root_item
1053                       *item);
1054 int btrfs_update_root(struct btrfs_trans_handle *trans, struct btrfs_root
1055                       *root, struct btrfs_key *key, struct btrfs_root_item
1056                       *item);
1057 int btrfs_find_last_root(struct btrfs_root *root, u64 objectid, struct
1058                          btrfs_root_item *item, struct btrfs_key *key);
1059 int btrfs_find_dead_roots(struct btrfs_root *root, u64 objectid,
1060                           struct btrfs_root *latest_root);
1061 /* dir-item.c */
1062 int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
1063                           *root, const char *name, int name_len, u64 dir,
1064                           struct btrfs_key *location, u8 type);
1065 struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans,
1066                                              struct btrfs_root *root,
1067                                              struct btrfs_path *path, u64 dir,
1068                                              const char *name, int name_len,
1069                                              int mod);
1070 struct btrfs_dir_item *
1071 btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans,
1072                             struct btrfs_root *root,
1073                             struct btrfs_path *path, u64 dir,
1074                             u64 objectid, const char *name, int name_len,
1075                             int mod);
1076 struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_root *root,
1077                               struct btrfs_path *path,
1078                               const char *name, int name_len);
1079 int btrfs_delete_one_dir_name(struct btrfs_trans_handle *trans,
1080                               struct btrfs_root *root,
1081                               struct btrfs_path *path,
1082                               struct btrfs_dir_item *di);
1083 int btrfs_insert_xattr_item(struct btrfs_trans_handle *trans,
1084                             struct btrfs_root *root, const char *name,
1085                             u16 name_len, const void *data, u16 data_len,
1086                             u64 dir);
1087 struct btrfs_dir_item *btrfs_lookup_xattr(struct btrfs_trans_handle *trans,
1088                                           struct btrfs_root *root,
1089                                           struct btrfs_path *path, u64 dir,
1090                                           const char *name, u16 name_len,
1091                                           int mod);
1092 /* inode-map.c */
1093 int btrfs_find_free_objectid(struct btrfs_trans_handle *trans,
1094                              struct btrfs_root *fs_root,
1095                              u64 dirid, u64 *objectid);
1096 int btrfs_find_highest_inode(struct btrfs_root *fs_root, u64 *objectid);
1097
1098 /* inode-item.c */
1099 int btrfs_insert_inode_ref(struct btrfs_trans_handle *trans,
1100                            struct btrfs_root *root,
1101                            const char *name, int name_len,
1102                            u64 inode_objectid, u64 ref_objectid);
1103 int btrfs_del_inode_ref(struct btrfs_trans_handle *trans,
1104                            struct btrfs_root *root,
1105                            const char *name, int name_len,
1106                            u64 inode_objectid, u64 ref_objectid);
1107 int btrfs_insert_empty_inode(struct btrfs_trans_handle *trans,
1108                              struct btrfs_root *root,
1109                              struct btrfs_path *path, u64 objectid);
1110 int btrfs_lookup_inode(struct btrfs_trans_handle *trans, struct btrfs_root
1111                        *root, struct btrfs_path *path,
1112                        struct btrfs_key *location, int mod);
1113
1114 /* file-item.c */
1115 int btrfs_insert_file_extent(struct btrfs_trans_handle *trans,
1116                                struct btrfs_root *root,
1117                                u64 objectid, u64 pos, u64 offset,
1118                                u64 disk_num_bytes,
1119                                u64 num_bytes);
1120 int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
1121                              struct btrfs_root *root,
1122                              struct btrfs_path *path, u64 objectid,
1123                              u64 bytenr, int mod);
1124 int btrfs_csum_file_block(struct btrfs_trans_handle *trans,
1125                           struct btrfs_root *root,
1126                           struct inode *inode,
1127                           u64 objectid, u64 offset,
1128                           char *data, size_t len);
1129 struct btrfs_csum_item *btrfs_lookup_csum(struct btrfs_trans_handle *trans,
1130                                           struct btrfs_root *root,
1131                                           struct btrfs_path *path,
1132                                           u64 objectid, u64 offset,
1133                                           int cow);
1134 int btrfs_csum_truncate(struct btrfs_trans_handle *trans,
1135                         struct btrfs_root *root, struct btrfs_path *path,
1136                         u64 isize);
1137 /* inode.c */
1138 unsigned long btrfs_force_ra(struct address_space *mapping,
1139                               struct file_ra_state *ra, struct file *file,
1140                               pgoff_t offset, pgoff_t last_index);
1141 int btrfs_check_free_space(struct btrfs_root *root, u64 num_required,
1142                            int for_del);
1143 int btrfs_page_mkwrite(struct vm_area_struct *vma, struct page *page);
1144 int btrfs_readpage(struct file *file, struct page *page);
1145 void btrfs_delete_inode(struct inode *inode);
1146 void btrfs_read_locked_inode(struct inode *inode);
1147 int btrfs_write_inode(struct inode *inode, int wait);
1148 void btrfs_dirty_inode(struct inode *inode);
1149 struct inode *btrfs_alloc_inode(struct super_block *sb);
1150 void btrfs_destroy_inode(struct inode *inode);
1151 int btrfs_init_cachep(void);
1152 void btrfs_destroy_cachep(void);
1153 long btrfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
1154 struct inode *btrfs_iget_locked(struct super_block *s, u64 objectid,
1155                                 struct btrfs_root *root);
1156 struct inode *btrfs_ilookup(struct super_block *s, u64 objectid,
1157                             u64 root_objectid);
1158 int btrfs_commit_write(struct file *file, struct page *page,
1159                        unsigned from, unsigned to);
1160 struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page,
1161                                     size_t page_offset, u64 start, u64 end,
1162                                     int create);
1163 int btrfs_update_inode(struct btrfs_trans_handle *trans,
1164                               struct btrfs_root *root,
1165                               struct inode *inode);
1166 /* file.c */
1167 int btrfs_drop_extent_cache(struct inode *inode, u64 start, u64 end);
1168 extern struct file_operations btrfs_file_operations;
1169 int btrfs_drop_extents(struct btrfs_trans_handle *trans,
1170                        struct btrfs_root *root, struct inode *inode,
1171                        u64 start, u64 end, u64 inline_limit, u64 *hint_block);
1172 /* tree-defrag.c */
1173 int btrfs_defrag_leaves(struct btrfs_trans_handle *trans,
1174                         struct btrfs_root *root, int cache_only);
1175
1176 /* sysfs.c */
1177 int btrfs_init_sysfs(void);
1178 void btrfs_exit_sysfs(void);
1179 int btrfs_sysfs_add_super(struct btrfs_fs_info *fs);
1180 int btrfs_sysfs_add_root(struct btrfs_root *root);
1181 void btrfs_sysfs_del_root(struct btrfs_root *root);
1182 void btrfs_sysfs_del_super(struct btrfs_fs_info *root);
1183
1184 /* xattr.c */
1185 ssize_t btrfs_listxattr(struct dentry *dentry, char *buffer, size_t size);
1186 int btrfs_delete_xattrs(struct btrfs_trans_handle *trans,
1187                         struct btrfs_root *root, struct inode *inode);
1188 /* super.c */
1189 u64 btrfs_parse_size(char *str);
1190 #endif