fs/btrfs/ctree.h

   1 /*
   2  * Copyright (C) 2007 Oracle.  All rights reserved.
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public
   6  * License v2 as published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  11  * General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public
  14  * License along with this program; if not, write to the
  15  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  16  * Boston, MA 021110-1307, USA.
  17  */
  18
  19 #ifndef __BTRFS__
  20 #define __BTRFS__
  21
  22 #include <linux/mm.h>
  23 #include <linux/highmem.h>
  24 #include <linux/fs.h>
  25 #include <linux/workqueue.h>
  26 #include <linux/completion.h>
  27 #include <asm/kmap_types.h>
  28 #include "bit-radix.h"
  29 #include "extent_map.h"
  30
  31 struct btrfs_trans_handle;
  32 struct btrfs_transaction;
  33 extern struct kmem_cache *btrfs_trans_handle_cachep;
  34 extern struct kmem_cache *btrfs_transaction_cachep;
  35 extern struct kmem_cache *btrfs_bit_radix_cachep;
  36 extern struct kmem_cache *btrfs_path_cachep;
  37
  38 #define BTRFS_MAGIC "_B2RfS_M"
  39
  40 #define BTRFS_ROOT_TREE_OBJECTID 1ULL
  41 #define BTRFS_EXTENT_TREE_OBJECTID 2ULL
  42 #define BTRFS_FS_TREE_OBJECTID 3ULL
  43 #define BTRFS_ROOT_TREE_DIR_OBJECTID 4ULL
  44 #define BTRFS_FIRST_FREE_OBJECTID 5ULL
  45
  46 /*
  47  * we can actually store much bigger names, but lets not confuse the rest
  48  * of linux
  49  */
  50 #define BTRFS_NAME_LEN 255
  51
  52 /* 32 bytes in various csum fields */
  53 #define BTRFS_CSUM_SIZE 32
  54 /* four bytes for CRC32 */
  55 #define BTRFS_CRC32_SIZE 4
  56 #define BTRFS_EMPTY_DIR_SIZE 6
  57
  58 #define BTRFS_FT_UNKNOWN        0
  59 #define BTRFS_FT_REG_FILE       1
  60 #define BTRFS_FT_DIR            2
  61 #define BTRFS_FT_CHRDEV         3
  62 #define BTRFS_FT_BLKDEV         4
  63 #define BTRFS_FT_FIFO           5
  64 #define BTRFS_FT_SOCK           6
  65 #define BTRFS_FT_SYMLINK        7
  66 #define BTRFS_FT_MAX            8
  67
  68 /*
  69  * the key defines the order in the tree, and so it also defines (optimal)
  70  * block layout.  objectid corresonds to the inode number.  The flags
  71  * tells us things about the object, and is a kind of stream selector.
  72  * so for a given inode, keys with flags of 1 might refer to the inode
  73  * data, flags of 2 may point to file data in the btree and flags == 3
  74  * may point to extents.
  75  *
  76  * offset is the starting byte offset for this key in the stream.
  77  *
  78  * btrfs_disk_key is in disk byte order.  struct btrfs_key is always
  79  * in cpu native order.  Otherwise they are identical and their sizes
  80  * should be the same (ie both packed)
  81  */
  82 struct btrfs_disk_key {
  83         __le64 objectid;
  84         u8 type;
  85         __le64 offset;
  86 } __attribute__ ((__packed__));
  87
  88 struct btrfs_key {
  89         u64 objectid;
  90         u8 type;
  91         u64 offset;
  92 } __attribute__ ((__packed__));
  93
  94 #define BTRFS_FSID_SIZE 16
  95 /*
  96  * every tree block (leaf or node) starts with this header.
  97  */
  98 struct btrfs_header {
  99         u8 csum[BTRFS_CSUM_SIZE];
 100         u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
 101         __le64 bytenr; /* which block this node is supposed to live in */
 102         __le64 generation;
 103         __le64 owner;
 104         __le32 nritems;
 105         __le16 flags;
 106         u8 level;
 107 } __attribute__ ((__packed__));
 108
 109 #define BTRFS_MAX_LEVEL 8
 110 #define BTRFS_NODEPTRS_PER_BLOCK(r) (((r)->nodesize - \
 111                                 sizeof(struct btrfs_header)) / \
 112                                (sizeof(struct btrfs_disk_key) + sizeof(u64)))
 113 #define __BTRFS_LEAF_DATA_SIZE(bs) ((bs) - sizeof(struct btrfs_header))
 114 #define BTRFS_LEAF_DATA_SIZE(r) (__BTRFS_LEAF_DATA_SIZE(r->leafsize))
 115 #define BTRFS_MAX_INLINE_DATA_SIZE(r) (BTRFS_LEAF_DATA_SIZE(r) - \
 116                                         sizeof(struct btrfs_item) - \
 117                                         sizeof(struct btrfs_file_extent_item))
 118
 119 /*
 120  * the super block basically lists the main trees of the FS
 121  * it currently lacks any block count etc etc
 122  */
 123 struct btrfs_super_block {
 124         u8 csum[BTRFS_CSUM_SIZE];
 125         /* the first 3 fields must match struct btrfs_header */
 126         u8 fsid[16];    /* FS specific uuid */
 127         __le64 bytenr; /* this block number */
 128         __le64 magic;
 129         __le64 generation;
 130         __le64 root;
 131         __le64 total_bytes;
 132         __le64 bytes_used;
 133         __le64 root_dir_objectid;
 134         __le32 sectorsize;
 135         __le32 nodesize;
 136         __le32 leafsize;
 137         u8 root_level;
 138 } __attribute__ ((__packed__));
 139
 140 /*
 141  * A leaf is full of items. offset and size tell us where to find
 142  * the item in the leaf (relative to the start of the data area)
 143  */
 144 struct btrfs_item {
 145         struct btrfs_disk_key key;
 146         __le32 offset;
 147         __le32 size;
 148 } __attribute__ ((__packed__));
 149
 150 /*
 151  * leaves have an item area and a data area:
 152  * [item0, item1....itemN] [free space] [dataN...data1, data0]
 153  *
 154  * The data is separate from the items to get the keys closer together
 155  * during searches.
 156  */
 157 struct btrfs_leaf {
 158         struct btrfs_header header;
 159         struct btrfs_item items[];
 160 } __attribute__ ((__packed__));
 161
 162 /*
 163  * all non-leaf blocks are nodes, they hold only keys and pointers to
 164  * other blocks
 165  */
 166 struct btrfs_key_ptr {
 167         struct btrfs_disk_key key;
 168         __le64 blockptr;
 169 } __attribute__ ((__packed__));
 170
 171 struct btrfs_node {
 172         struct btrfs_header header;
 173         struct btrfs_key_ptr ptrs[];
 174 } __attribute__ ((__packed__));
 175
 176 /*
 177  * btrfs_paths remember the path taken from the root down to the leaf.
 178  * level 0 is always the leaf, and nodes[1...BTRFS_MAX_LEVEL] will point
 179  * to any other levels that are present.
 180  *
 181  * The slots array records the index of the item or block pointer
 182  * used while walking the tree.
 183  */
 184 struct btrfs_path {
 185         struct extent_buffer *nodes[BTRFS_MAX_LEVEL];
 186         int slots[BTRFS_MAX_LEVEL];
 187         int reada;
 188         int lowest_level;
 189 };
 190
 191 /*
 192  * items in the extent btree are used to record the objectid of the
 193  * owner of the block and the number of references
 194  */
 195 struct btrfs_extent_item {
 196         __le32 refs;
 197         __le64 owner;
 198 } __attribute__ ((__packed__));
 199
 200 struct btrfs_inode_timespec {
 201         __le64 sec;
 202         __le32 nsec;
 203 } __attribute__ ((__packed__));
 204
 205 /*
 206  * there is no padding here on purpose.  If you want to extent the inode,
 207  * make a new item type
 208  */
 209 struct btrfs_inode_item {
 210         __le64 generation;
 211         __le64 size;
 212         __le64 nblocks;
 213         __le64 block_group;
 214         __le32 nlink;
 215         __le32 uid;
 216         __le32 gid;
 217         __le32 mode;
 218         __le32 rdev;
 219         __le16 flags;
 220         __le16 compat_flags;
 221         struct btrfs_inode_timespec atime;
 222         struct btrfs_inode_timespec ctime;
 223         struct btrfs_inode_timespec mtime;
 224         struct btrfs_inode_timespec otime;
 225 } __attribute__ ((__packed__));
 226
 227 struct btrfs_dir_item {
 228         struct btrfs_disk_key location;
 229         __le16 flags;
 230         __le16 name_len;
 231         u8 type;
 232 } __attribute__ ((__packed__));
 233
 234 struct btrfs_root_item {
 235         struct btrfs_inode_item inode;
 236         __le64 root_dirid;
 237         __le64 bytenr;
 238         __le64 byte_limit;
 239         __le64 bytes_used;
 240         __le32 flags;
 241         __le32 refs;
 242         struct btrfs_disk_key drop_progress;
 243         u8 drop_level;
 244         u8 level;
 245 } __attribute__ ((__packed__));
 246
 247 #define BTRFS_FILE_EXTENT_REG 0
 248 #define BTRFS_FILE_EXTENT_INLINE 1
 249
 250 struct btrfs_file_extent_item {
 251         __le64 generation;
 252         u8 type;
 253         /*
 254          * disk space consumed by the extent, checksum blocks are included
 255          * in these numbers
 256          */
 257         __le64 disk_bytenr;
 258         __le64 disk_num_bytes;
 259         /*
 260          * the logical offset in file blocks (no csums)
 261          * this extent record is for.  This allows a file extent to point
 262          * into the middle of an existing extent on disk, sharing it
 263          * between two snapshots (useful if some bytes in the middle of the
 264          * extent have changed
 265          */
 266         __le64 offset;
 267         /*
 268          * the logical number of file blocks (no csums included)
 269          */
 270         __le64 num_bytes;
 271 } __attribute__ ((__packed__));
 272
 273 struct btrfs_csum_item {
 274         u8 csum;
 275 } __attribute__ ((__packed__));
 276
 277 /* tag for the radix tree of block groups in ram */
 278 #define BTRFS_BLOCK_GROUP_SIZE (256 * 1024 * 1024)
 279
 280
 281 #define BTRFS_BLOCK_GROUP_DATA 1
 282 #define BTRFS_BLOCK_GROUP_MIXED 2
 283
 284 struct btrfs_block_group_item {
 285         __le64 used;
 286         u8 flags;
 287 } __attribute__ ((__packed__));
 288
 289 struct btrfs_block_group_cache {
 290         struct btrfs_key key;
 291         struct btrfs_block_group_item item;
 292         int data;
 293         int cached;
 294 };
 295
 296 struct btrfs_fs_info {
 297         u8 fsid[BTRFS_FSID_SIZE];
 298         struct btrfs_root *extent_root;
 299         struct btrfs_root *tree_root;
 300         struct radix_tree_root fs_roots_radix;
 301
 302         struct extent_map_tree free_space_cache;
 303         struct extent_map_tree block_group_cache;
 304         struct extent_map_tree pinned_extents;
 305         struct extent_map_tree pending_del;
 306         struct extent_map_tree extent_ins;
 307
 308         u64 generation;
 309         u64 last_trans_committed;
 310         struct btrfs_transaction *running_transaction;
 311         struct btrfs_super_block super_copy;
 312         struct extent_buffer *sb_buffer;
 313         struct super_block *sb;
 314         struct inode *btree_inode;
 315         spinlock_t hash_lock;
 316         struct mutex trans_mutex;
 317         struct mutex fs_mutex;
 318         struct list_head trans_list;
 319         struct list_head hashers;
 320         struct list_head dead_roots;
 321         struct delayed_work trans_work;
 322         struct kobject super_kobj;
 323         struct completion kobj_unregister;
 324         int do_barriers;
 325         int closing;
 326 };
 327
 328 /*
 329  * in ram representation of the tree.  extent_root is used for all allocations
 330  * and for the extent tree extent_root root.
 331  */
 332 struct btrfs_root {
 333         struct extent_buffer *node;
 334         struct extent_buffer *commit_root;
 335         struct btrfs_root_item root_item;
 336         struct btrfs_key root_key;
 337         struct btrfs_fs_info *fs_info;
 338         struct inode *inode;
 339         struct kobject root_kobj;
 340         struct completion kobj_unregister;
 341         struct rw_semaphore snap_sem;
 342         u64 objectid;
 343         u64 last_trans;
 344
 345         /* data allocations are done in sectorsize units */
 346         u32 sectorsize;
 347
 348         /* node allocations are done in nodesize units */
 349         u32 nodesize;
 350
 351         /* leaf allocations are done in leafsize units */
 352         u32 leafsize;
 353
 354         u32 type;
 355         u64 highest_inode;
 356         u64 last_inode_alloc;
 357         int ref_cows;
 358         struct btrfs_key defrag_progress;
 359         int defrag_running;
 360         int defrag_level;
 361         char *name;
 362 };
 363
 364 /*
 365  * inode items have the data typically returned from stat and store other
 366  * info about object characteristics.  There is one for every file and dir in
 367  * the FS
 368  */
 369 #define BTRFS_INODE_ITEM_KEY            1
 370
 371 /* reserve 2-15 close to the inode for later flexibility */
 372
 373 /*
 374  * dir items are the name -> inode pointers in a directory.  There is one
 375  * for every name in a directory.
 376  */
 377 #define BTRFS_DIR_ITEM_KEY      16
 378 #define BTRFS_DIR_INDEX_KEY     17
 379 /*
 380  * extent data is for file data
 381  */
 382 #define BTRFS_EXTENT_DATA_KEY   18
 383 /*
 384  * csum items have the checksums for data in the extents
 385  */
 386 #define BTRFS_CSUM_ITEM_KEY     19
 387
 388 /* reserve 20-31 for other file stuff */
 389
 390 /*
 391  * root items point to tree roots.  There are typically in the root
 392  * tree used by the super block to find all the other trees
 393  */
 394 #define BTRFS_ROOT_ITEM_KEY     32
 395 /*
 396  * extent items are in the extent map tree.  These record which blocks
 397  * are used, and how many references there are to each block
 398  */
 399 #define BTRFS_EXTENT_ITEM_KEY   33
 400
 401 /*
 402  * block groups give us hints into the extent allocation trees.  Which
 403  * blocks are free etc etc
 404  */
 405 #define BTRFS_BLOCK_GROUP_ITEM_KEY 34
 406
 407 /*
 408  * string items are for debugging.  They just store a short string of
 409  * data in the FS
 410  */
 411 #define BTRFS_STRING_ITEM_KEY   253
 412
 413 /* some macros to generate set/get funcs for the struct fields.  This
 414  * assumes there is a lefoo_to_cpu for every type, so lets make a simple
 415  * one for u8:
 416  */
 417 #define le8_to_cpu(v) (v)
 418 #define cpu_to_le8(v) (v)
 419 #define __le8 u8
 420
 421 #define read_eb_member(eb, ptr, type, member, result) (                 \
 422         read_extent_buffer(eb, (char *)(result),                        \
 423                            ((unsigned long)(ptr)) +                     \
 424                             offsetof(type, member),                     \
 425                            sizeof(((type *)0)->member)))
 426
 427 #define write_eb_member(eb, ptr, type, member, result) (                \
 428         write_extent_buffer(eb, (char *)(result),                       \
 429                            ((unsigned long)(ptr)) +                     \
 430                             offsetof(type, member),                     \
 431                            sizeof(((type *)0)->member)))
 432
 433 #ifndef BTRFS_SETGET_FUNCS
 434 #define BTRFS_SETGET_FUNCS(name, type, member, bits)                    \
 435 u##bits btrfs_##name(struct extent_buffer *eb, type *s);                \
 436 void btrfs_set_##name(struct extent_buffer *eb, type *s, u##bits val);
 437 #endif
 438
 439 #define BTRFS_SETGET_HEADER_FUNCS(name, type, member, bits)             \
 440 static inline u##bits btrfs_##name(struct extent_buffer *eb)            \
 441 {                                                                       \
 442         char *kaddr = kmap_atomic(eb->first_page, KM_USER0);            \
 443         unsigned long offset = offsetof(type, member);                  \
 444         u##bits res;                                                    \
 445         __le##bits *tmp = (__le##bits *)(kaddr + offset);               \
 446         res = le##bits##_to_cpu(*tmp);                                  \
 447         kunmap_atomic(kaddr, KM_USER0);                                 \
 448         return res;                                                     \
 449 }                                                                       \
 450 static inline void btrfs_set_##name(struct extent_buffer *eb,           \
 451                                     u##bits val)                        \
 452 {                                                                       \
 453         char *kaddr = kmap_atomic(eb->first_page, KM_USER0);            \
 454         unsigned long offset = offsetof(type, member);                  \
 455         __le##bits *tmp = (__le##bits *)(kaddr + offset);               \
 456         *tmp = cpu_to_le##bits(val);                                    \
 457         kunmap_atomic(kaddr, KM_USER0);                                 \
 458 }
 459
 460 #define BTRFS_SETGET_STACK_FUNCS(name, type, member, bits)              \
 461 static inline u##bits btrfs_##name(type *s)                             \
 462 {                                                                       \
 463         return le##bits##_to_cpu(s->member);                            \
 464 }                                                                       \
 465 static inline void btrfs_set_##name(type *s, u##bits val)               \
 466 {                                                                       \
 467         s->member = cpu_to_le##bits(val);                               \
 468 }
 469
 470 /* struct btrfs_block_group_item */
 471 BTRFS_SETGET_STACK_FUNCS(block_group_used, struct btrfs_block_group_item,
 472                          used, 64);
 473 BTRFS_SETGET_FUNCS(disk_block_group_used, struct btrfs_block_group_item,
 474                          used, 64);
 475
 476 /* struct btrfs_inode_item */
 477 BTRFS_SETGET_FUNCS(inode_generation, struct btrfs_inode_item, generation, 64);
 478 BTRFS_SETGET_FUNCS(inode_size, struct btrfs_inode_item, size, 64);
 479 BTRFS_SETGET_FUNCS(inode_nblocks, struct btrfs_inode_item, nblocks, 64);
 480 BTRFS_SETGET_FUNCS(inode_block_group, struct btrfs_inode_item, block_group, 64);
 481 BTRFS_SETGET_FUNCS(inode_nlink, struct btrfs_inode_item, nlink, 32);
 482 BTRFS_SETGET_FUNCS(inode_uid, struct btrfs_inode_item, uid, 32);
 483 BTRFS_SETGET_FUNCS(inode_gid, struct btrfs_inode_item, gid, 32);
 484 BTRFS_SETGET_FUNCS(inode_mode, struct btrfs_inode_item, mode, 32);
 485 BTRFS_SETGET_FUNCS(inode_rdev, struct btrfs_inode_item, rdev, 32);
 486 BTRFS_SETGET_FUNCS(inode_flags, struct btrfs_inode_item, flags, 16);
 487 BTRFS_SETGET_FUNCS(inode_compat_flags, struct btrfs_inode_item,
 488                    compat_flags, 16);
 489
 490 static inline struct btrfs_inode_timespec *
 491 btrfs_inode_atime(struct btrfs_inode_item *inode_item)
 492 {
 493         unsigned long ptr = (unsigned long)inode_item;
 494         ptr += offsetof(struct btrfs_inode_item, atime);
 495         return (struct btrfs_inode_timespec *)ptr;
 496 }
 497
 498 static inline struct btrfs_inode_timespec *
 499 btrfs_inode_mtime(struct btrfs_inode_item *inode_item)
 500 {
 501         unsigned long ptr = (unsigned long)inode_item;
 502         ptr += offsetof(struct btrfs_inode_item, mtime);
 503         return (struct btrfs_inode_timespec *)ptr;
 504 }
 505
 506 static inline struct btrfs_inode_timespec *
 507 btrfs_inode_ctime(struct btrfs_inode_item *inode_item)
 508 {
 509         unsigned long ptr = (unsigned long)inode_item;
 510         ptr += offsetof(struct btrfs_inode_item, ctime);
 511         return (struct btrfs_inode_timespec *)ptr;
 512 }
 513
 514 static inline struct btrfs_inode_timespec *
 515 btrfs_inode_otime(struct btrfs_inode_item *inode_item)
 516 {
 517         unsigned long ptr = (unsigned long)inode_item;
 518         ptr += offsetof(struct btrfs_inode_item, otime);
 519         return (struct btrfs_inode_timespec *)ptr;
 520 }
 521
 522 BTRFS_SETGET_FUNCS(timespec_sec, struct btrfs_inode_timespec, sec, 64);
 523 BTRFS_SETGET_FUNCS(timespec_nsec, struct btrfs_inode_timespec, nsec, 32);
 524
 525 /* struct btrfs_extent_item */
 526 BTRFS_SETGET_FUNCS(extent_refs, struct btrfs_extent_item, refs, 32);
 527 BTRFS_SETGET_FUNCS(extent_owner, struct btrfs_extent_item, owner, 64);
 528
 529 BTRFS_SETGET_STACK_FUNCS(stack_extent_refs, struct btrfs_extent_item,
 530                          refs, 32);
 531 BTRFS_SETGET_STACK_FUNCS(stack_extent_owner, struct btrfs_extent_item,
 532                          owner, 64);
 533
 534 /* struct btrfs_node */
 535 BTRFS_SETGET_FUNCS(key_blockptr, struct btrfs_key_ptr, blockptr, 64);
 536
 537 static inline u64 btrfs_node_blockptr(struct extent_buffer *eb, int nr)
 538 {
 539         unsigned long ptr;
 540         ptr = offsetof(struct btrfs_node, ptrs) +
 541                 sizeof(struct btrfs_key_ptr) * nr;
 542         return btrfs_key_blockptr(eb, (struct btrfs_key_ptr *)ptr);
 543 }
 544
 545 static inline void btrfs_set_node_blockptr(struct extent_buffer *eb,
 546                                            int nr, u64 val)
 547 {
 548         unsigned long ptr;
 549         ptr = offsetof(struct btrfs_node, ptrs) +
 550                 sizeof(struct btrfs_key_ptr) * nr;
 551         btrfs_set_key_blockptr(eb, (struct btrfs_key_ptr *)ptr, val);
 552 }
 553
 554 static inline unsigned long btrfs_node_key_ptr_offset(int nr)
 555 {
 556         return offsetof(struct btrfs_node, ptrs) +
 557                 sizeof(struct btrfs_key_ptr) * nr;
 558 }
 559
 560 static inline void btrfs_node_key(struct extent_buffer *eb,
 561                            struct btrfs_disk_key *disk_key, int nr)
 562 {
 563         unsigned long ptr;
 564         ptr = btrfs_node_key_ptr_offset(nr);
 565         read_eb_member(eb, (struct btrfs_key_ptr *)ptr,
 566                        struct btrfs_key_ptr, key, disk_key);
 567 }
 568 static inline void btrfs_set_node_key(struct extent_buffer *eb,
 569                                       struct btrfs_disk_key *disk_key, int nr)
 570 {
 571         unsigned long ptr;
 572         ptr = btrfs_node_key_ptr_offset(nr);
 573         write_eb_member(eb, (struct btrfs_key_ptr *)ptr,
 574                        struct btrfs_key_ptr, key, disk_key);
 575 }
 576
 577 /* struct btrfs_item */
 578 BTRFS_SETGET_FUNCS(item_offset, struct btrfs_item, offset, 32);
 579 BTRFS_SETGET_FUNCS(item_size, struct btrfs_item, size, 32);
 580
 581 static inline unsigned long btrfs_item_nr_offset(int nr)
 582 {
 583         return offsetof(struct btrfs_leaf, items) +
 584                 sizeof(struct btrfs_item) * nr;
 585 }
 586
 587 static inline struct btrfs_item *btrfs_item_nr(struct extent_buffer *eb,
 588                                                int nr)
 589 {
 590         return (struct btrfs_item *)btrfs_item_nr_offset(nr);
 591 }
 592
 593 static inline u32 btrfs_item_end(struct extent_buffer *eb,
 594                                  struct btrfs_item *item)
 595 {
 596         return btrfs_item_offset(eb, item) + btrfs_item_size(eb, item);
 597 }
 598
 599 static inline u32 btrfs_item_end_nr(struct extent_buffer *eb, int nr)
 600 {
 601         return btrfs_item_end(eb, btrfs_item_nr(eb, nr));
 602 }
 603
 604 static inline u32 btrfs_item_offset_nr(struct extent_buffer *eb, int nr)
 605 {
 606         return btrfs_item_offset(eb, btrfs_item_nr(eb, nr));
 607 }
 608
 609 static inline u32 btrfs_item_size_nr(struct extent_buffer *eb, int nr)
 610 {
 611         return btrfs_item_size(eb, btrfs_item_nr(eb, nr));
 612 }
 613
 614 static inline void btrfs_item_key(struct extent_buffer *eb,
 615                            struct btrfs_disk_key *disk_key, int nr)
 616 {
 617         struct btrfs_item *item = btrfs_item_nr(eb, nr);
 618         read_eb_member(eb, item, struct btrfs_item, key, disk_key);
 619 }
 620
 621 static inline void btrfs_set_item_key(struct extent_buffer *eb,
 622                                struct btrfs_disk_key *disk_key, int nr)
 623 {
 624         struct btrfs_item *item = btrfs_item_nr(eb, nr);
 625         write_eb_member(eb, item, struct btrfs_item, key, disk_key);
 626 }
 627
 628 /* struct btrfs_dir_item */
 629 BTRFS_SETGET_FUNCS(dir_flags, struct btrfs_dir_item, flags, 16);
 630 BTRFS_SETGET_FUNCS(dir_type, struct btrfs_dir_item, type, 8);
 631 BTRFS_SETGET_FUNCS(dir_name_len, struct btrfs_dir_item, name_len, 16);
 632
 633 static inline void btrfs_dir_item_key(struct extent_buffer *eb,
 634                                       struct btrfs_dir_item *item,
 635                                       struct btrfs_disk_key *key)
 636 {
 637         read_eb_member(eb, item, struct btrfs_dir_item, location, key);
 638 }
 639
 640 static inline void btrfs_set_dir_item_key(struct extent_buffer *eb,
 641                                           struct btrfs_dir_item *item,
 642                                           struct btrfs_disk_key *key)
 643 {
 644         write_eb_member(eb, item, struct btrfs_dir_item, location, key);
 645 }
 646
 647 /* struct btrfs_disk_key */
 648 BTRFS_SETGET_STACK_FUNCS(disk_key_objectid, struct btrfs_disk_key,
 649                          objectid, 64);
 650 BTRFS_SETGET_STACK_FUNCS(disk_key_offset, struct btrfs_disk_key, offset, 64);
 651 BTRFS_SETGET_STACK_FUNCS(disk_key_type, struct btrfs_disk_key, type, 8);
 652
 653 static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu,
 654                                          struct btrfs_disk_key *disk)
 655 {
 656         cpu->offset = le64_to_cpu(disk->offset);
 657         cpu->type = disk->type;
 658         cpu->objectid = le64_to_cpu(disk->objectid);
 659 }
 660
 661 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk,
 662                                          struct btrfs_key *cpu)
 663 {
 664         disk->offset = cpu_to_le64(cpu->offset);
 665         disk->type = cpu->type;
 666         disk->objectid = cpu_to_le64(cpu->objectid);
 667 }
 668
 669 static inline void btrfs_node_key_to_cpu(struct extent_buffer *eb,
 670                                   struct btrfs_key *key, int nr)
 671 {
 672         struct btrfs_disk_key disk_key;
 673         btrfs_node_key(eb, &disk_key, nr);
 674         btrfs_disk_key_to_cpu(key, &disk_key);
 675 }
 676
 677 static inline void btrfs_item_key_to_cpu(struct extent_buffer *eb,
 678                                   struct btrfs_key *key, int nr)
 679 {
 680         struct btrfs_disk_key disk_key;
 681         btrfs_item_key(eb, &disk_key, nr);
 682         btrfs_disk_key_to_cpu(key, &disk_key);
 683 }
 684
 685 static inline void btrfs_dir_item_key_to_cpu(struct extent_buffer *eb,
 686                                       struct btrfs_dir_item *item,
 687                                       struct btrfs_key *key)
 688 {
 689         struct btrfs_disk_key disk_key;
 690         btrfs_dir_item_key(eb, item, &disk_key);
 691         btrfs_disk_key_to_cpu(key, &disk_key);
 692 }
 693
 694
 695 static inline u8 btrfs_key_type(struct btrfs_key *key)
 696 {
 697         return key->type;
 698 }
 699
 700 static inline void btrfs_set_key_type(struct btrfs_key *key, u8 val)
 701 {
 702         key->type = val;
 703 }
 704
 705 /* struct btrfs_header */
 706 BTRFS_SETGET_HEADER_FUNCS(header_bytenr, struct btrfs_header, bytenr, 64);
 707 BTRFS_SETGET_HEADER_FUNCS(header_generation, struct btrfs_header,
 708                           generation, 64);
 709 BTRFS_SETGET_HEADER_FUNCS(header_owner, struct btrfs_header, owner, 64);
 710 BTRFS_SETGET_HEADER_FUNCS(header_nritems, struct btrfs_header, nritems, 32);
 711 BTRFS_SETGET_HEADER_FUNCS(header_flags, struct btrfs_header, flags, 16);
 712 BTRFS_SETGET_HEADER_FUNCS(header_level, struct btrfs_header, level, 8);
 713
 714 static inline u8 *btrfs_header_fsid(struct extent_buffer *eb)
 715 {
 716         unsigned long ptr = offsetof(struct btrfs_header, fsid);
 717         return (u8 *)ptr;
 718 }
 719
 720 static inline u8 *btrfs_super_fsid(struct extent_buffer *eb)
 721 {
 722         unsigned long ptr = offsetof(struct btrfs_super_block, fsid);
 723         return (u8 *)ptr;
 724 }
 725
 726 static inline u8 *btrfs_header_csum(struct extent_buffer *eb)
 727 {
 728         unsigned long ptr = offsetof(struct btrfs_header, csum);
 729         return (u8 *)ptr;
 730 }
 731
 732 static inline struct btrfs_node *btrfs_buffer_node(struct extent_buffer *eb)
 733 {
 734         return NULL;
 735 }
 736
 737 static inline struct btrfs_leaf *btrfs_buffer_leaf(struct extent_buffer *eb)
 738 {
 739         return NULL;
 740 }
 741
 742 static inline struct btrfs_header *btrfs_buffer_header(struct extent_buffer *eb)
 743 {
 744         return NULL;
 745 }
 746
 747 static inline int btrfs_is_leaf(struct extent_buffer *eb)
 748 {
 749         return (btrfs_header_level(eb) == 0);
 750 }
 751
 752 /* struct btrfs_root_item */
 753 BTRFS_SETGET_FUNCS(disk_root_refs, struct btrfs_root_item, refs, 32);
 754 BTRFS_SETGET_FUNCS(disk_root_bytenr, struct btrfs_root_item, bytenr, 64);
 755 BTRFS_SETGET_FUNCS(disk_root_level, struct btrfs_root_item, level, 8);
 756
 757 BTRFS_SETGET_STACK_FUNCS(root_bytenr, struct btrfs_root_item, bytenr, 64);
 758 BTRFS_SETGET_STACK_FUNCS(root_level, struct btrfs_root_item, level, 8);
 759 BTRFS_SETGET_STACK_FUNCS(root_dirid, struct btrfs_root_item, root_dirid, 64);
 760 BTRFS_SETGET_STACK_FUNCS(root_refs, struct btrfs_root_item, refs, 32);
 761 BTRFS_SETGET_STACK_FUNCS(root_flags, struct btrfs_root_item, flags, 32);
 762 BTRFS_SETGET_STACK_FUNCS(root_used, struct btrfs_root_item, bytes_used, 64);
 763 BTRFS_SETGET_STACK_FUNCS(root_limit, struct btrfs_root_item, byte_limit, 64);
 764
 765 /* struct btrfs_super_block */
 766 BTRFS_SETGET_STACK_FUNCS(super_bytenr, struct btrfs_super_block, bytenr, 64);
 767 BTRFS_SETGET_STACK_FUNCS(super_generation, struct btrfs_super_block,
 768                          generation, 64);
 769 BTRFS_SETGET_STACK_FUNCS(super_root, struct btrfs_super_block, root, 64);
 770 BTRFS_SETGET_STACK_FUNCS(super_root_level, struct btrfs_super_block,
 771                          root_level, 8);
 772 BTRFS_SETGET_STACK_FUNCS(super_total_bytes, struct btrfs_super_block,
 773                          total_bytes, 64);
 774 BTRFS_SETGET_STACK_FUNCS(super_bytes_used, struct btrfs_super_block,
 775                          bytes_used, 64);
 776 BTRFS_SETGET_STACK_FUNCS(super_sectorsize, struct btrfs_super_block,
 777                          sectorsize, 32);
 778 BTRFS_SETGET_STACK_FUNCS(super_nodesize, struct btrfs_super_block,
 779                          nodesize, 32);
 780 BTRFS_SETGET_STACK_FUNCS(super_leafsize, struct btrfs_super_block,
 781                          leafsize, 32);
 782 BTRFS_SETGET_STACK_FUNCS(super_root_dir, struct btrfs_super_block,
 783                          root_dir_objectid, 64);
 784
 785 static inline unsigned long btrfs_leaf_data(struct extent_buffer *l)
 786 {
 787         return offsetof(struct btrfs_leaf, items);
 788 }
 789
 790 /* struct btrfs_file_extent_item */
 791 BTRFS_SETGET_FUNCS(file_extent_type, struct btrfs_file_extent_item, type, 8);
 792
 793 static inline unsigned long btrfs_file_extent_inline_start(struct
 794                                                    btrfs_file_extent_item *e)
 795 {
 796         unsigned long offset = (unsigned long)e;
 797         offset += offsetof(struct btrfs_file_extent_item, disk_bytenr);
 798         return offset;
 799 }
 800
 801 static inline u32 btrfs_file_extent_calc_inline_size(u32 datasize)
 802 {
 803         return offsetof(struct btrfs_file_extent_item, disk_bytenr) + datasize;
 804 }
 805
 806 static inline u32 btrfs_file_extent_inline_len(struct extent_buffer *eb,
 807                                                struct btrfs_item *e)
 808 {
 809         unsigned long offset;
 810         offset = offsetof(struct btrfs_file_extent_item, disk_bytenr);
 811         return btrfs_item_size(eb, e) - offset;
 812 }
 813
 814 BTRFS_SETGET_FUNCS(file_extent_disk_bytenr, struct btrfs_file_extent_item,
 815                    disk_bytenr, 64);
 816 BTRFS_SETGET_FUNCS(file_extent_generation, struct btrfs_file_extent_item,
 817                    generation, 64);
 818 BTRFS_SETGET_FUNCS(file_extent_disk_num_bytes, struct btrfs_file_extent_item,
 819                    disk_num_bytes, 64);
 820 BTRFS_SETGET_FUNCS(file_extent_offset, struct btrfs_file_extent_item,
 821                   offset, 64);
 822 BTRFS_SETGET_FUNCS(file_extent_num_bytes, struct btrfs_file_extent_item,
 823                    num_bytes, 64);
 824
 825 static inline struct btrfs_root *btrfs_sb(struct super_block *sb)
 826 {
 827         return sb->s_fs_info;
 828 }
 829
 830 static inline int btrfs_set_root_name(struct btrfs_root *root,
 831                                       const char *name, int len)
 832 {
 833         /* if we already have a name just free it */
 834         if (root->name)
 835                 kfree(root->name);
 836
 837         root->name = kmalloc(len+1, GFP_KERNEL);
 838         if (!root->name)
 839                 return -ENOMEM;
 840
 841         memcpy(root->name, name, len);
 842         root->name[len] ='\0';
 843
 844         return 0;
 845 }
 846
 847 static inline u32 btrfs_level_size(struct btrfs_root *root, int level) {
 848         if (level == 0)
 849                 return root->leafsize;
 850         return root->nodesize;
 851 }
 852
 853 /* helper function to cast into the data area of the leaf. */
 854 #define btrfs_item_ptr(leaf, slot, type) \
 855         ((type *)(btrfs_leaf_data(leaf) + \
 856         btrfs_item_offset_nr(leaf, slot)))
 857
 858 #define btrfs_item_ptr_offset(leaf, slot) \
 859         ((unsigned long)(btrfs_leaf_data(leaf) + \
 860         btrfs_item_offset_nr(leaf, slot)))
 861
 862 /* mount option defines and helpers */
 863 #define BTRFS_MOUNT_SUBVOL              0x000001
 864 #define btrfs_clear_opt(o, opt)         o &= ~BTRFS_MOUNT_##opt
 865 #define btrfs_set_opt(o, opt)           o |= BTRFS_MOUNT_##opt
 866 #define btrfs_test_opt(sb, opt)         (BTRFS_SB(sb)->s_mount_opt & \
 867                                          BTRFS_MOUNT_##opt)
 868 /* extent-tree.c */
 869 int btrfs_extent_post_op(struct btrfs_trans_handle *trans,
 870                          struct btrfs_root *root);
 871 int btrfs_copy_pinned(struct btrfs_root *root, struct extent_map_tree *copy);
 872 struct btrfs_block_group_cache *btrfs_lookup_block_group(struct
 873                                                          btrfs_fs_info *info,
 874                                                          u64 bytenr);
 875 struct btrfs_block_group_cache *btrfs_find_block_group(struct btrfs_root *root,
 876                                                  struct btrfs_block_group_cache
 877                                                  *hint, u64 search_start,
 878                                                  int data, int owner);
 879 int btrfs_inc_root_ref(struct btrfs_trans_handle *trans,
 880                        struct btrfs_root *root);
 881 struct extent_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
 882                                             struct btrfs_root *root, u32 size,
 883                                             u64 hint, u64 empty_size);
 884 int btrfs_alloc_extent(struct btrfs_trans_handle *trans,
 885                        struct btrfs_root *root, u64 owner,
 886                        u64 num_bytes, u64 empty_size, u64 search_start,
 887                        u64 search_end, struct btrfs_key *ins, int data);
 888 int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
 889                   struct extent_buffer *buf);
 890 int btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
 891                       *root, u64 bytenr, u64 num_bytes, int pin);
 892 int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans,
 893                                struct btrfs_root *root,
 894                                struct extent_map_tree *unpin);
 895 int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
 896                                 struct btrfs_root *root,
 897                                 u64 bytenr, u64 num_bytes);
 898 int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans,
 899                                     struct btrfs_root *root);
 900 int btrfs_free_block_groups(struct btrfs_fs_info *info);
 901 int btrfs_read_block_groups(struct btrfs_root *root);
 902 /* ctree.c */
 903 int btrfs_cow_block(struct btrfs_trans_handle *trans,
 904                     struct btrfs_root *root, struct extent_buffer *buf,
 905                     struct extent_buffer *parent, int parent_slot,
 906                     struct extent_buffer **cow_ret);
 907 int btrfs_extend_item(struct btrfs_trans_handle *trans, struct btrfs_root
 908                       *root, struct btrfs_path *path, u32 data_size);
 909 int btrfs_truncate_item(struct btrfs_trans_handle *trans,
 910                         struct btrfs_root *root,
 911                         struct btrfs_path *path,
 912                         u32 new_size, int from_end);
 913 int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root
 914                       *root, struct btrfs_key *key, struct btrfs_path *p, int
 915                       ins_len, int cow);
 916 int btrfs_realloc_node(struct btrfs_trans_handle *trans,
 917                        struct btrfs_root *root, struct extent_buffer *parent,
 918                        int start_slot, int cache_only, u64 *last_ret,
 919                        struct btrfs_key *progress);
 920 void btrfs_release_path(struct btrfs_root *root, struct btrfs_path *p);
 921 struct btrfs_path *btrfs_alloc_path(void);
 922 void btrfs_free_path(struct btrfs_path *p);
 923 void btrfs_init_path(struct btrfs_path *p);
 924 int btrfs_del_item(struct btrfs_trans_handle *trans, struct btrfs_root *root,
 925                    struct btrfs_path *path);
 926 int btrfs_insert_item(struct btrfs_trans_handle *trans, struct btrfs_root
 927                       *root, struct btrfs_key *key, void *data, u32 data_size);
 928 int btrfs_insert_empty_item(struct btrfs_trans_handle *trans, struct btrfs_root
 929                             *root, struct btrfs_path *path, struct btrfs_key
 930                             *cpu_key, u32 data_size);
 931 int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path);
 932 int btrfs_leaf_free_space(struct btrfs_root *root, struct extent_buffer *leaf);
 933 int btrfs_drop_snapshot(struct btrfs_trans_handle *trans, struct btrfs_root
 934                         *root);
 935 /* root-item.c */
 936 int btrfs_del_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
 937                    struct btrfs_key *key);
 938 int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root
 939                       *root, struct btrfs_key *key, struct btrfs_root_item
 940                       *item);
 941 int btrfs_update_root(struct btrfs_trans_handle *trans, struct btrfs_root
 942                       *root, struct btrfs_key *key, struct btrfs_root_item
 943                       *item);
 944 int btrfs_find_last_root(struct btrfs_root *root, u64 objectid, struct
 945                          btrfs_root_item *item, struct btrfs_key *key);
 946 int btrfs_find_dead_roots(struct btrfs_root *root, u64 objectid,
 947                           struct btrfs_root *latest_root);
 948 /* dir-item.c */
 949 int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
 950                           *root, const char *name, int name_len, u64 dir,
 951                           struct btrfs_key *location, u8 type);
 952 struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans,
 953                                              struct btrfs_root *root,
 954                                              struct btrfs_path *path, u64 dir,
 955                                              const char *name, int name_len,
 956                                              int mod);
 957 struct btrfs_dir_item *
 958 btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans,
 959                             struct btrfs_root *root,
 960                             struct btrfs_path *path, u64 dir,
 961                             u64 objectid, const char *name, int name_len,
 962                             int mod);
 963 struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_root *root,
 964                               struct btrfs_path *path,
 965                               const char *name, int name_len);
 966 int btrfs_delete_one_dir_name(struct btrfs_trans_handle *trans,
 967                               struct btrfs_root *root,
 968                               struct btrfs_path *path,
 969                               struct btrfs_dir_item *di);
 970 /* inode-map.c */
 971 int btrfs_find_free_objectid(struct btrfs_trans_handle *trans,
 972                              struct btrfs_root *fs_root,
 973                              u64 dirid, u64 *objectid);
 974 int btrfs_find_highest_inode(struct btrfs_root *fs_root, u64 *objectid);
 975
 976 /* inode-item.c */
 977 int btrfs_insert_empty_inode(struct btrfs_trans_handle *trans,
 978                              struct btrfs_root *root,
 979                              struct btrfs_path *path, u64 objectid);
 980 int btrfs_lookup_inode(struct btrfs_trans_handle *trans, struct btrfs_root
 981                        *root, struct btrfs_path *path,
 982                        struct btrfs_key *location, int mod);
 983
 984 /* file-item.c */
 985 int btrfs_insert_file_extent(struct btrfs_trans_handle *trans,
 986                                struct btrfs_root *root,
 987                                u64 objectid, u64 pos, u64 offset,
 988                                u64 disk_num_bytes,
 989                                u64 num_bytes);
 990 int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
 991                              struct btrfs_root *root,
 992                              struct btrfs_path *path, u64 objectid,
 993                              u64 bytenr, int mod);
 994 int btrfs_csum_file_block(struct btrfs_trans_handle *trans,
 995                           struct btrfs_root *root,
 996                           struct inode *inode,
 997                           u64 objectid, u64 offset,
 998                           char *data, size_t len);
 999 struct btrfs_csum_item *btrfs_lookup_csum(struct btrfs_trans_handle *trans,
1000                                           struct btrfs_root *root,
1001                                           struct btrfs_path *path,
1002                                           u64 objectid, u64 offset,
1003                                           int cow);
1004 int btrfs_csum_truncate(struct btrfs_trans_handle *trans,
1005                         struct btrfs_root *root, struct btrfs_path *path,
1006                         u64 isize);
1007 /* inode.c */
1008 int btrfs_page_mkwrite(struct vm_area_struct *vma, struct page *page);
1009 int btrfs_readpage(struct file *file, struct page *page);
1010 void btrfs_delete_inode(struct inode *inode);
1011 void btrfs_read_locked_inode(struct inode *inode);
1012 int btrfs_write_inode(struct inode *inode, int wait);
1013 void btrfs_dirty_inode(struct inode *inode);
1014 struct inode *btrfs_alloc_inode(struct super_block *sb);
1015 void btrfs_destroy_inode(struct inode *inode);
1016 int btrfs_init_cachep(void);
1017 void btrfs_destroy_cachep(void);
1018 long btrfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
1019 struct inode *btrfs_iget_locked(struct super_block *s, u64 objectid,
1020                                 struct btrfs_root *root);
1021 int btrfs_commit_write(struct file *file, struct page *page,
1022                        unsigned from, unsigned to);
1023 struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page,
1024                                     size_t page_offset, u64 start, u64 end,
1025                                     int create);
1026 int btrfs_update_inode(struct btrfs_trans_handle *trans,
1027                               struct btrfs_root *root,
1028                               struct inode *inode);
1029 /* file.c */
1030 int btrfs_drop_extent_cache(struct inode *inode, u64 start, u64 end);
1031 extern struct file_operations btrfs_file_operations;
1032 int btrfs_drop_extents(struct btrfs_trans_handle *trans,
1033                        struct btrfs_root *root, struct inode *inode,
1034                        u64 start, u64 end, u64 inline_end, u64 *hint_block);
1035 /* tree-defrag.c */
1036 int btrfs_defrag_leaves(struct btrfs_trans_handle *trans,
1037                         struct btrfs_root *root, int cache_only);
1038
1039 /* sysfs.c */
1040 int btrfs_init_sysfs(void);
1041 void btrfs_exit_sysfs(void);
1042 int btrfs_sysfs_add_super(struct btrfs_fs_info *fs);
1043 int btrfs_sysfs_add_root(struct btrfs_root *root);
1044 void btrfs_sysfs_del_root(struct btrfs_root *root);
1045 void btrfs_sysfs_del_super(struct btrfs_fs_info *root);
1046
1047 #endif