linux/fs/btrfs/ctree.h
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   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/mm.h>
  23#include <linux/highmem.h>
  24#include <linux/fs.h>
  25#include <linux/rwsem.h>
  26#include <linux/completion.h>
  27#include <linux/backing-dev.h>
  28#include <linux/wait.h>
  29#include <linux/slab.h>
  30#include <linux/kobject.h>
  31#include <trace/events/btrfs.h>
  32#include <asm/kmap_types.h>
  33#include <linux/pagemap.h>
  34#include "extent_io.h"
  35#include "extent_map.h"
  36#include "async-thread.h"
  37#include "ioctl.h"
  38
  39struct btrfs_trans_handle;
  40struct btrfs_transaction;
  41struct btrfs_pending_snapshot;
  42extern struct kmem_cache *btrfs_trans_handle_cachep;
  43extern struct kmem_cache *btrfs_transaction_cachep;
  44extern struct kmem_cache *btrfs_bit_radix_cachep;
  45extern struct kmem_cache *btrfs_path_cachep;
  46extern struct kmem_cache *btrfs_free_space_cachep;
  47struct btrfs_ordered_sum;
  48
  49#define BTRFS_MAGIC "_BHRfS_M"
  50
  51#define BTRFS_MAX_MIRRORS 2
  52
  53#define BTRFS_MAX_LEVEL 8
  54
  55#define BTRFS_COMPAT_EXTENT_TREE_V0
  56
  57/*
  58 * files bigger than this get some pre-flushing when they are added
  59 * to the ordered operations list.  That way we limit the total
  60 * work done by the commit
  61 */
  62#define BTRFS_ORDERED_OPERATIONS_FLUSH_LIMIT (8 * 1024 * 1024)
  63
  64/* holds pointers to all of the tree roots */
  65#define BTRFS_ROOT_TREE_OBJECTID 1ULL
  66
  67/* stores information about which extents are in use, and reference counts */
  68#define BTRFS_EXTENT_TREE_OBJECTID 2ULL
  69
  70/*
  71 * chunk tree stores translations from logical -> physical block numbering
  72 * the super block points to the chunk tree
  73 */
  74#define BTRFS_CHUNK_TREE_OBJECTID 3ULL
  75
  76/*
  77 * stores information about which areas of a given device are in use.
  78 * one per device.  The tree of tree roots points to the device tree
  79 */
  80#define BTRFS_DEV_TREE_OBJECTID 4ULL
  81
  82/* one per subvolume, storing files and directories */
  83#define BTRFS_FS_TREE_OBJECTID 5ULL
  84
  85/* directory objectid inside the root tree */
  86#define BTRFS_ROOT_TREE_DIR_OBJECTID 6ULL
  87
  88/* holds checksums of all the data extents */
  89#define BTRFS_CSUM_TREE_OBJECTID 7ULL
  90
  91/* for storing balance parameters in the root tree */
  92#define BTRFS_BALANCE_OBJECTID -4ULL
  93
  94/* holds quota configuration and tracking */
  95#define BTRFS_QUOTA_TREE_OBJECTID 8ULL
  96
  97/* orhpan objectid for tracking unlinked/truncated files */
  98#define BTRFS_ORPHAN_OBJECTID -5ULL
  99
 100/* does write ahead logging to speed up fsyncs */
 101#define BTRFS_TREE_LOG_OBJECTID -6ULL
 102#define BTRFS_TREE_LOG_FIXUP_OBJECTID -7ULL
 103
 104/* for space balancing */
 105#define BTRFS_TREE_RELOC_OBJECTID -8ULL
 106#define BTRFS_DATA_RELOC_TREE_OBJECTID -9ULL
 107
 108/*
 109 * extent checksums all have this objectid
 110 * this allows them to share the logging tree
 111 * for fsyncs
 112 */
 113#define BTRFS_EXTENT_CSUM_OBJECTID -10ULL
 114
 115/* For storing free space cache */
 116#define BTRFS_FREE_SPACE_OBJECTID -11ULL
 117
 118/*
 119 * The inode number assigned to the special inode for sotring
 120 * free ino cache
 121 */
 122#define BTRFS_FREE_INO_OBJECTID -12ULL
 123
 124/* dummy objectid represents multiple objectids */
 125#define BTRFS_MULTIPLE_OBJECTIDS -255ULL
 126
 127/*
 128 * All files have objectids in this range.
 129 */
 130#define BTRFS_FIRST_FREE_OBJECTID 256ULL
 131#define BTRFS_LAST_FREE_OBJECTID -256ULL
 132#define BTRFS_FIRST_CHUNK_TREE_OBJECTID 256ULL
 133
 134
 135/*
 136 * the device items go into the chunk tree.  The key is in the form
 137 * [ 1 BTRFS_DEV_ITEM_KEY device_id ]
 138 */
 139#define BTRFS_DEV_ITEMS_OBJECTID 1ULL
 140
 141#define BTRFS_BTREE_INODE_OBJECTID 1
 142
 143#define BTRFS_EMPTY_SUBVOL_DIR_OBJECTID 2
 144
 145/*
 146 * the max metadata block size.  This limit is somewhat artificial,
 147 * but the memmove costs go through the roof for larger blocks.
 148 */
 149#define BTRFS_MAX_METADATA_BLOCKSIZE 65536
 150
 151/*
 152 * we can actually store much bigger names, but lets not confuse the rest
 153 * of linux
 154 */
 155#define BTRFS_NAME_LEN 255
 156
 157/* 32 bytes in various csum fields */
 158#define BTRFS_CSUM_SIZE 32
 159
 160/* csum types */
 161#define BTRFS_CSUM_TYPE_CRC32   0
 162
 163static int btrfs_csum_sizes[] = { 4, 0 };
 164
 165/* four bytes for CRC32 */
 166#define BTRFS_EMPTY_DIR_SIZE 0
 167
 168#define BTRFS_FT_UNKNOWN        0
 169#define BTRFS_FT_REG_FILE       1
 170#define BTRFS_FT_DIR            2
 171#define BTRFS_FT_CHRDEV         3
 172#define BTRFS_FT_BLKDEV         4
 173#define BTRFS_FT_FIFO           5
 174#define BTRFS_FT_SOCK           6
 175#define BTRFS_FT_SYMLINK        7
 176#define BTRFS_FT_XATTR          8
 177#define BTRFS_FT_MAX            9
 178
 179/* ioprio of readahead is set to idle */
 180#define BTRFS_IOPRIO_READA (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_IDLE, 0))
 181
 182/*
 183 * The key defines the order in the tree, and so it also defines (optimal)
 184 * block layout.
 185 *
 186 * objectid corresponds to the inode number.
 187 *
 188 * type tells us things about the object, and is a kind of stream selector.
 189 * so for a given inode, keys with type of 1 might refer to the inode data,
 190 * type of 2 may point to file data in the btree and type == 3 may point to
 191 * extents.
 192 *
 193 * offset is the starting byte offset for this key in the stream.
 194 *
 195 * btrfs_disk_key is in disk byte order.  struct btrfs_key is always
 196 * in cpu native order.  Otherwise they are identical and their sizes
 197 * should be the same (ie both packed)
 198 */
 199struct btrfs_disk_key {
 200        __le64 objectid;
 201        u8 type;
 202        __le64 offset;
 203} __attribute__ ((__packed__));
 204
 205struct btrfs_key {
 206        u64 objectid;
 207        u8 type;
 208        u64 offset;
 209} __attribute__ ((__packed__));
 210
 211struct btrfs_mapping_tree {
 212        struct extent_map_tree map_tree;
 213};
 214
 215struct btrfs_dev_item {
 216        /* the internal btrfs device id */
 217        __le64 devid;
 218
 219        /* size of the device */
 220        __le64 total_bytes;
 221
 222        /* bytes used */
 223        __le64 bytes_used;
 224
 225        /* optimal io alignment for this device */
 226        __le32 io_align;
 227
 228        /* optimal io width for this device */
 229        __le32 io_width;
 230
 231        /* minimal io size for this device */
 232        __le32 sector_size;
 233
 234        /* type and info about this device */
 235        __le64 type;
 236
 237        /* expected generation for this device */
 238        __le64 generation;
 239
 240        /*
 241         * starting byte of this partition on the device,
 242         * to allow for stripe alignment in the future
 243         */
 244        __le64 start_offset;
 245
 246        /* grouping information for allocation decisions */
 247        __le32 dev_group;
 248
 249        /* seek speed 0-100 where 100 is fastest */
 250        u8 seek_speed;
 251
 252        /* bandwidth 0-100 where 100 is fastest */
 253        u8 bandwidth;
 254
 255        /* btrfs generated uuid for this device */
 256        u8 uuid[BTRFS_UUID_SIZE];
 257
 258        /* uuid of FS who owns this device */
 259        u8 fsid[BTRFS_UUID_SIZE];
 260} __attribute__ ((__packed__));
 261
 262struct btrfs_stripe {
 263        __le64 devid;
 264        __le64 offset;
 265        u8 dev_uuid[BTRFS_UUID_SIZE];
 266} __attribute__ ((__packed__));
 267
 268struct btrfs_chunk {
 269        /* size of this chunk in bytes */
 270        __le64 length;
 271
 272        /* objectid of the root referencing this chunk */
 273        __le64 owner;
 274
 275        __le64 stripe_len;
 276        __le64 type;
 277
 278        /* optimal io alignment for this chunk */
 279        __le32 io_align;
 280
 281        /* optimal io width for this chunk */
 282        __le32 io_width;
 283
 284        /* minimal io size for this chunk */
 285        __le32 sector_size;
 286
 287        /* 2^16 stripes is quite a lot, a second limit is the size of a single
 288         * item in the btree
 289         */
 290        __le16 num_stripes;
 291
 292        /* sub stripes only matter for raid10 */
 293        __le16 sub_stripes;
 294        struct btrfs_stripe stripe;
 295        /* additional stripes go here */
 296} __attribute__ ((__packed__));
 297
 298#define BTRFS_FREE_SPACE_EXTENT 1
 299#define BTRFS_FREE_SPACE_BITMAP 2
 300
 301struct btrfs_free_space_entry {
 302        __le64 offset;
 303        __le64 bytes;
 304        u8 type;
 305} __attribute__ ((__packed__));
 306
 307struct btrfs_free_space_header {
 308        struct btrfs_disk_key location;
 309        __le64 generation;
 310        __le64 num_entries;
 311        __le64 num_bitmaps;
 312} __attribute__ ((__packed__));
 313
 314static inline unsigned long btrfs_chunk_item_size(int num_stripes)
 315{
 316        BUG_ON(num_stripes == 0);
 317        return sizeof(struct btrfs_chunk) +
 318                sizeof(struct btrfs_stripe) * (num_stripes - 1);
 319}
 320
 321#define BTRFS_HEADER_FLAG_WRITTEN       (1ULL << 0)
 322#define BTRFS_HEADER_FLAG_RELOC         (1ULL << 1)
 323
 324/*
 325 * File system states
 326 */
 327
 328/* Errors detected */
 329#define BTRFS_SUPER_FLAG_ERROR          (1ULL << 2)
 330
 331#define BTRFS_SUPER_FLAG_SEEDING        (1ULL << 32)
 332#define BTRFS_SUPER_FLAG_METADUMP       (1ULL << 33)
 333
 334#define BTRFS_BACKREF_REV_MAX           256
 335#define BTRFS_BACKREF_REV_SHIFT         56
 336#define BTRFS_BACKREF_REV_MASK          (((u64)BTRFS_BACKREF_REV_MAX - 1) << \
 337                                         BTRFS_BACKREF_REV_SHIFT)
 338
 339#define BTRFS_OLD_BACKREF_REV           0
 340#define BTRFS_MIXED_BACKREF_REV         1
 341
 342/*
 343 * every tree block (leaf or node) starts with this header.
 344 */
 345struct btrfs_header {
 346        /* these first four must match the super block */
 347        u8 csum[BTRFS_CSUM_SIZE];
 348        u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
 349        __le64 bytenr; /* which block this node is supposed to live in */
 350        __le64 flags;
 351
 352        /* allowed to be different from the super from here on down */
 353        u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
 354        __le64 generation;
 355        __le64 owner;
 356        __le32 nritems;
 357        u8 level;
 358} __attribute__ ((__packed__));
 359
 360#define BTRFS_NODEPTRS_PER_BLOCK(r) (((r)->nodesize - \
 361                                      sizeof(struct btrfs_header)) / \
 362                                     sizeof(struct btrfs_key_ptr))
 363#define __BTRFS_LEAF_DATA_SIZE(bs) ((bs) - sizeof(struct btrfs_header))
 364#define BTRFS_LEAF_DATA_SIZE(r) (__BTRFS_LEAF_DATA_SIZE(r->leafsize))
 365#define BTRFS_MAX_INLINE_DATA_SIZE(r) (BTRFS_LEAF_DATA_SIZE(r) - \
 366                                        sizeof(struct btrfs_item) - \
 367                                        sizeof(struct btrfs_file_extent_item))
 368#define BTRFS_MAX_XATTR_SIZE(r) (BTRFS_LEAF_DATA_SIZE(r) - \
 369                                 sizeof(struct btrfs_item) -\
 370                                 sizeof(struct btrfs_dir_item))
 371
 372
 373/*
 374 * this is a very generous portion of the super block, giving us
 375 * room to translate 14 chunks with 3 stripes each.
 376 */
 377#define BTRFS_SYSTEM_CHUNK_ARRAY_SIZE 2048
 378#define BTRFS_LABEL_SIZE 256
 379
 380/*
 381 * just in case we somehow lose the roots and are not able to mount,
 382 * we store an array of the roots from previous transactions
 383 * in the super.
 384 */
 385#define BTRFS_NUM_BACKUP_ROOTS 4
 386struct btrfs_root_backup {
 387        __le64 tree_root;
 388        __le64 tree_root_gen;
 389
 390        __le64 chunk_root;
 391        __le64 chunk_root_gen;
 392
 393        __le64 extent_root;
 394        __le64 extent_root_gen;
 395
 396        __le64 fs_root;
 397        __le64 fs_root_gen;
 398
 399        __le64 dev_root;
 400        __le64 dev_root_gen;
 401
 402        __le64 csum_root;
 403        __le64 csum_root_gen;
 404
 405        __le64 total_bytes;
 406        __le64 bytes_used;
 407        __le64 num_devices;
 408        /* future */
 409        __le64 unsed_64[4];
 410
 411        u8 tree_root_level;
 412        u8 chunk_root_level;
 413        u8 extent_root_level;
 414        u8 fs_root_level;
 415        u8 dev_root_level;
 416        u8 csum_root_level;
 417        /* future and to align */
 418        u8 unused_8[10];
 419} __attribute__ ((__packed__));
 420
 421/*
 422 * the super block basically lists the main trees of the FS
 423 * it currently lacks any block count etc etc
 424 */
 425struct btrfs_super_block {
 426        u8 csum[BTRFS_CSUM_SIZE];
 427        /* the first 4 fields must match struct btrfs_header */
 428        u8 fsid[BTRFS_FSID_SIZE];    /* FS specific uuid */
 429        __le64 bytenr; /* this block number */
 430        __le64 flags;
 431
 432        /* allowed to be different from the btrfs_header from here own down */
 433        __le64 magic;
 434        __le64 generation;
 435        __le64 root;
 436        __le64 chunk_root;
 437        __le64 log_root;
 438
 439        /* this will help find the new super based on the log root */
 440        __le64 log_root_transid;
 441        __le64 total_bytes;
 442        __le64 bytes_used;
 443        __le64 root_dir_objectid;
 444        __le64 num_devices;
 445        __le32 sectorsize;
 446        __le32 nodesize;
 447        __le32 leafsize;
 448        __le32 stripesize;
 449        __le32 sys_chunk_array_size;
 450        __le64 chunk_root_generation;
 451        __le64 compat_flags;
 452        __le64 compat_ro_flags;
 453        __le64 incompat_flags;
 454        __le16 csum_type;
 455        u8 root_level;
 456        u8 chunk_root_level;
 457        u8 log_root_level;
 458        struct btrfs_dev_item dev_item;
 459
 460        char label[BTRFS_LABEL_SIZE];
 461
 462        __le64 cache_generation;
 463
 464        /* future expansion */
 465        __le64 reserved[31];
 466        u8 sys_chunk_array[BTRFS_SYSTEM_CHUNK_ARRAY_SIZE];
 467        struct btrfs_root_backup super_roots[BTRFS_NUM_BACKUP_ROOTS];
 468} __attribute__ ((__packed__));
 469
 470/*
 471 * Compat flags that we support.  If any incompat flags are set other than the
 472 * ones specified below then we will fail to mount
 473 */
 474#define BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF    (1ULL << 0)
 475#define BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL   (1ULL << 1)
 476#define BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS     (1ULL << 2)
 477#define BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO     (1ULL << 3)
 478/*
 479 * some patches floated around with a second compression method
 480 * lets save that incompat here for when they do get in
 481 * Note we don't actually support it, we're just reserving the
 482 * number
 483 */
 484#define BTRFS_FEATURE_INCOMPAT_COMPRESS_LZOv2   (1ULL << 4)
 485
 486/*
 487 * older kernels tried to do bigger metadata blocks, but the
 488 * code was pretty buggy.  Lets not let them try anymore.
 489 */
 490#define BTRFS_FEATURE_INCOMPAT_BIG_METADATA     (1ULL << 5)
 491
 492#define BTRFS_FEATURE_COMPAT_SUPP               0ULL
 493#define BTRFS_FEATURE_COMPAT_RO_SUPP            0ULL
 494#define BTRFS_FEATURE_INCOMPAT_SUPP                     \
 495        (BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF |         \
 496         BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL |        \
 497         BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS |          \
 498         BTRFS_FEATURE_INCOMPAT_BIG_METADATA |          \
 499         BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO)
 500
 501/*
 502 * A leaf is full of items. offset and size tell us where to find
 503 * the item in the leaf (relative to the start of the data area)
 504 */
 505struct btrfs_item {
 506        struct btrfs_disk_key key;
 507        __le32 offset;
 508        __le32 size;
 509} __attribute__ ((__packed__));
 510
 511/*
 512 * leaves have an item area and a data area:
 513 * [item0, item1....itemN] [free space] [dataN...data1, data0]
 514 *
 515 * The data is separate from the items to get the keys closer together
 516 * during searches.
 517 */
 518struct btrfs_leaf {
 519        struct btrfs_header header;
 520        struct btrfs_item items[];
 521} __attribute__ ((__packed__));
 522
 523/*
 524 * all non-leaf blocks are nodes, they hold only keys and pointers to
 525 * other blocks
 526 */
 527struct btrfs_key_ptr {
 528        struct btrfs_disk_key key;
 529        __le64 blockptr;
 530        __le64 generation;
 531} __attribute__ ((__packed__));
 532
 533struct btrfs_node {
 534        struct btrfs_header header;
 535        struct btrfs_key_ptr ptrs[];
 536} __attribute__ ((__packed__));
 537
 538/*
 539 * btrfs_paths remember the path taken from the root down to the leaf.
 540 * level 0 is always the leaf, and nodes[1...BTRFS_MAX_LEVEL] will point
 541 * to any other levels that are present.
 542 *
 543 * The slots array records the index of the item or block pointer
 544 * used while walking the tree.
 545 */
 546struct btrfs_path {
 547        struct extent_buffer *nodes[BTRFS_MAX_LEVEL];
 548        int slots[BTRFS_MAX_LEVEL];
 549        /* if there is real range locking, this locks field will change */
 550        int locks[BTRFS_MAX_LEVEL];
 551        int reada;
 552        /* keep some upper locks as we walk down */
 553        int lowest_level;
 554
 555        /*
 556         * set by btrfs_split_item, tells search_slot to keep all locks
 557         * and to force calls to keep space in the nodes
 558         */
 559        unsigned int search_for_split:1;
 560        unsigned int keep_locks:1;
 561        unsigned int skip_locking:1;
 562        unsigned int leave_spinning:1;
 563        unsigned int search_commit_root:1;
 564};
 565
 566/*
 567 * items in the extent btree are used to record the objectid of the
 568 * owner of the block and the number of references
 569 */
 570
 571struct btrfs_extent_item {
 572        __le64 refs;
 573        __le64 generation;
 574        __le64 flags;
 575} __attribute__ ((__packed__));
 576
 577struct btrfs_extent_item_v0 {
 578        __le32 refs;
 579} __attribute__ ((__packed__));
 580
 581#define BTRFS_MAX_EXTENT_ITEM_SIZE(r) ((BTRFS_LEAF_DATA_SIZE(r) >> 4) - \
 582                                        sizeof(struct btrfs_item))
 583
 584#define BTRFS_EXTENT_FLAG_DATA          (1ULL << 0)
 585#define BTRFS_EXTENT_FLAG_TREE_BLOCK    (1ULL << 1)
 586
 587/* following flags only apply to tree blocks */
 588
 589/* use full backrefs for extent pointers in the block */
 590#define BTRFS_BLOCK_FLAG_FULL_BACKREF   (1ULL << 8)
 591
 592/*
 593 * this flag is only used internally by scrub and may be changed at any time
 594 * it is only declared here to avoid collisions
 595 */
 596#define BTRFS_EXTENT_FLAG_SUPER         (1ULL << 48)
 597
 598struct btrfs_tree_block_info {
 599        struct btrfs_disk_key key;
 600        u8 level;
 601} __attribute__ ((__packed__));
 602
 603struct btrfs_extent_data_ref {
 604        __le64 root;
 605        __le64 objectid;
 606        __le64 offset;
 607        __le32 count;
 608} __attribute__ ((__packed__));
 609
 610struct btrfs_shared_data_ref {
 611        __le32 count;
 612} __attribute__ ((__packed__));
 613
 614struct btrfs_extent_inline_ref {
 615        u8 type;
 616        __le64 offset;
 617} __attribute__ ((__packed__));
 618
 619/* old style backrefs item */
 620struct btrfs_extent_ref_v0 {
 621        __le64 root;
 622        __le64 generation;
 623        __le64 objectid;
 624        __le32 count;
 625} __attribute__ ((__packed__));
 626
 627
 628/* dev extents record free space on individual devices.  The owner
 629 * field points back to the chunk allocation mapping tree that allocated
 630 * the extent.  The chunk tree uuid field is a way to double check the owner
 631 */
 632struct btrfs_dev_extent {
 633        __le64 chunk_tree;
 634        __le64 chunk_objectid;
 635        __le64 chunk_offset;
 636        __le64 length;
 637        u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
 638} __attribute__ ((__packed__));
 639
 640struct btrfs_inode_ref {
 641        __le64 index;
 642        __le16 name_len;
 643        /* name goes here */
 644} __attribute__ ((__packed__));
 645
 646struct btrfs_timespec {
 647        __le64 sec;
 648        __le32 nsec;
 649} __attribute__ ((__packed__));
 650
 651enum btrfs_compression_type {
 652        BTRFS_COMPRESS_NONE  = 0,
 653        BTRFS_COMPRESS_ZLIB  = 1,
 654        BTRFS_COMPRESS_LZO   = 2,
 655        BTRFS_COMPRESS_TYPES = 2,
 656        BTRFS_COMPRESS_LAST  = 3,
 657};
 658
 659struct btrfs_inode_item {
 660        /* nfs style generation number */
 661        __le64 generation;
 662        /* transid that last touched this inode */
 663        __le64 transid;
 664        __le64 size;
 665        __le64 nbytes;
 666        __le64 block_group;
 667        __le32 nlink;
 668        __le32 uid;
 669        __le32 gid;
 670        __le32 mode;
 671        __le64 rdev;
 672        __le64 flags;
 673
 674        /* modification sequence number for NFS */
 675        __le64 sequence;
 676
 677        /*
 678         * a little future expansion, for more than this we can
 679         * just grow the inode item and version it
 680         */
 681        __le64 reserved[4];
 682        struct btrfs_timespec atime;
 683        struct btrfs_timespec ctime;
 684        struct btrfs_timespec mtime;
 685        struct btrfs_timespec otime;
 686} __attribute__ ((__packed__));
 687
 688struct btrfs_dir_log_item {
 689        __le64 end;
 690} __attribute__ ((__packed__));
 691
 692struct btrfs_dir_item {
 693        struct btrfs_disk_key location;
 694        __le64 transid;
 695        __le16 data_len;
 696        __le16 name_len;
 697        u8 type;
 698} __attribute__ ((__packed__));
 699
 700#define BTRFS_ROOT_SUBVOL_RDONLY        (1ULL << 0)
 701
 702struct btrfs_root_item {
 703        struct btrfs_inode_item inode;
 704        __le64 generation;
 705        __le64 root_dirid;
 706        __le64 bytenr;
 707        __le64 byte_limit;
 708        __le64 bytes_used;
 709        __le64 last_snapshot;
 710        __le64 flags;
 711        __le32 refs;
 712        struct btrfs_disk_key drop_progress;
 713        u8 drop_level;
 714        u8 level;
 715
 716        /*
 717         * The following fields appear after subvol_uuids+subvol_times
 718         * were introduced.
 719         */
 720
 721        /*
 722         * This generation number is used to test if the new fields are valid
 723         * and up to date while reading the root item. Everytime the root item
 724         * is written out, the "generation" field is copied into this field. If
 725         * anyone ever mounted the fs with an older kernel, we will have
 726         * mismatching generation values here and thus must invalidate the
 727         * new fields. See btrfs_update_root and btrfs_find_last_root for
 728         * details.
 729         * the offset of generation_v2 is also used as the start for the memset
 730         * when invalidating the fields.
 731         */
 732        __le64 generation_v2;
 733        u8 uuid[BTRFS_UUID_SIZE];
 734        u8 parent_uuid[BTRFS_UUID_SIZE];
 735        u8 received_uuid[BTRFS_UUID_SIZE];
 736        __le64 ctransid; /* updated when an inode changes */
 737        __le64 otransid; /* trans when created */
 738        __le64 stransid; /* trans when sent. non-zero for received subvol */
 739        __le64 rtransid; /* trans when received. non-zero for received subvol */
 740        struct btrfs_timespec ctime;
 741        struct btrfs_timespec otime;
 742        struct btrfs_timespec stime;
 743        struct btrfs_timespec rtime;
 744        __le64 reserved[8]; /* for future */
 745} __attribute__ ((__packed__));
 746
 747/*
 748 * this is used for both forward and backward root refs
 749 */
 750struct btrfs_root_ref {
 751        __le64 dirid;
 752        __le64 sequence;
 753        __le16 name_len;
 754} __attribute__ ((__packed__));
 755
 756struct btrfs_disk_balance_args {
 757        /*
 758         * profiles to operate on, single is denoted by
 759         * BTRFS_AVAIL_ALLOC_BIT_SINGLE
 760         */
 761        __le64 profiles;
 762
 763        /* usage filter */
 764        __le64 usage;
 765
 766        /* devid filter */
 767        __le64 devid;
 768
 769        /* devid subset filter [pstart..pend) */
 770        __le64 pstart;
 771        __le64 pend;
 772
 773        /* btrfs virtual address space subset filter [vstart..vend) */
 774        __le64 vstart;
 775        __le64 vend;
 776
 777        /*
 778         * profile to convert to, single is denoted by
 779         * BTRFS_AVAIL_ALLOC_BIT_SINGLE
 780         */
 781        __le64 target;
 782
 783        /* BTRFS_BALANCE_ARGS_* */
 784        __le64 flags;
 785
 786        __le64 unused[8];
 787} __attribute__ ((__packed__));
 788
 789/*
 790 * store balance parameters to disk so that balance can be properly
 791 * resumed after crash or unmount
 792 */
 793struct btrfs_balance_item {
 794        /* BTRFS_BALANCE_* */
 795        __le64 flags;
 796
 797        struct btrfs_disk_balance_args data;
 798        struct btrfs_disk_balance_args meta;
 799        struct btrfs_disk_balance_args sys;
 800
 801        __le64 unused[4];
 802} __attribute__ ((__packed__));
 803
 804#define BTRFS_FILE_EXTENT_INLINE 0
 805#define BTRFS_FILE_EXTENT_REG 1
 806#define BTRFS_FILE_EXTENT_PREALLOC 2
 807
 808struct btrfs_file_extent_item {
 809        /*
 810         * transaction id that created this extent
 811         */
 812        __le64 generation;
 813        /*
 814         * max number of bytes to hold this extent in ram
 815         * when we split a compressed extent we can't know how big
 816         * each of the resulting pieces will be.  So, this is
 817         * an upper limit on the size of the extent in ram instead of
 818         * an exact limit.
 819         */
 820        __le64 ram_bytes;
 821
 822        /*
 823         * 32 bits for the various ways we might encode the data,
 824         * including compression and encryption.  If any of these
 825         * are set to something a given disk format doesn't understand
 826         * it is treated like an incompat flag for reading and writing,
 827         * but not for stat.
 828         */
 829        u8 compression;
 830        u8 encryption;
 831        __le16 other_encoding; /* spare for later use */
 832
 833        /* are we inline data or a real extent? */
 834        u8 type;
 835
 836        /*
 837         * disk space consumed by the extent, checksum blocks are included
 838         * in these numbers
 839         */
 840        __le64 disk_bytenr;
 841        __le64 disk_num_bytes;
 842        /*
 843         * the logical offset in file blocks (no csums)
 844         * this extent record is for.  This allows a file extent to point
 845         * into the middle of an existing extent on disk, sharing it
 846         * between two snapshots (useful if some bytes in the middle of the
 847         * extent have changed
 848         */
 849        __le64 offset;
 850        /*
 851         * the logical number of file blocks (no csums included).  This
 852         * always reflects the size uncompressed and without encoding.
 853         */
 854        __le64 num_bytes;
 855
 856} __attribute__ ((__packed__));
 857
 858struct btrfs_csum_item {
 859        u8 csum;
 860} __attribute__ ((__packed__));
 861
 862struct btrfs_dev_stats_item {
 863        /*
 864         * grow this item struct at the end for future enhancements and keep
 865         * the existing values unchanged
 866         */
 867        __le64 values[BTRFS_DEV_STAT_VALUES_MAX];
 868} __attribute__ ((__packed__));
 869
 870/* different types of block groups (and chunks) */
 871#define BTRFS_BLOCK_GROUP_DATA          (1ULL << 0)
 872#define BTRFS_BLOCK_GROUP_SYSTEM        (1ULL << 1)
 873#define BTRFS_BLOCK_GROUP_METADATA      (1ULL << 2)
 874#define BTRFS_BLOCK_GROUP_RAID0         (1ULL << 3)
 875#define BTRFS_BLOCK_GROUP_RAID1         (1ULL << 4)
 876#define BTRFS_BLOCK_GROUP_DUP           (1ULL << 5)
 877#define BTRFS_BLOCK_GROUP_RAID10        (1ULL << 6)
 878#define BTRFS_BLOCK_GROUP_RESERVED      BTRFS_AVAIL_ALLOC_BIT_SINGLE
 879#define BTRFS_NR_RAID_TYPES             5
 880
 881#define BTRFS_BLOCK_GROUP_TYPE_MASK     (BTRFS_BLOCK_GROUP_DATA |    \
 882                                         BTRFS_BLOCK_GROUP_SYSTEM |  \
 883                                         BTRFS_BLOCK_GROUP_METADATA)
 884
 885#define BTRFS_BLOCK_GROUP_PROFILE_MASK  (BTRFS_BLOCK_GROUP_RAID0 |   \
 886                                         BTRFS_BLOCK_GROUP_RAID1 |   \
 887                                         BTRFS_BLOCK_GROUP_DUP |     \
 888                                         BTRFS_BLOCK_GROUP_RAID10)
 889/*
 890 * We need a bit for restriper to be able to tell when chunks of type
 891 * SINGLE are available.  This "extended" profile format is used in
 892 * fs_info->avail_*_alloc_bits (in-memory) and balance item fields
 893 * (on-disk).  The corresponding on-disk bit in chunk.type is reserved
 894 * to avoid remappings between two formats in future.
 895 */
 896#define BTRFS_AVAIL_ALLOC_BIT_SINGLE    (1ULL << 48)
 897
 898#define BTRFS_EXTENDED_PROFILE_MASK     (BTRFS_BLOCK_GROUP_PROFILE_MASK | \
 899                                         BTRFS_AVAIL_ALLOC_BIT_SINGLE)
 900
 901static inline u64 chunk_to_extended(u64 flags)
 902{
 903        if ((flags & BTRFS_BLOCK_GROUP_PROFILE_MASK) == 0)
 904                flags |= BTRFS_AVAIL_ALLOC_BIT_SINGLE;
 905
 906        return flags;
 907}
 908static inline u64 extended_to_chunk(u64 flags)
 909{
 910        return flags & ~BTRFS_AVAIL_ALLOC_BIT_SINGLE;
 911}
 912
 913struct btrfs_block_group_item {
 914        __le64 used;
 915        __le64 chunk_objectid;
 916        __le64 flags;
 917} __attribute__ ((__packed__));
 918
 919/*
 920 * is subvolume quota turned on?
 921 */
 922#define BTRFS_QGROUP_STATUS_FLAG_ON             (1ULL << 0)
 923/*
 924 * SCANNING is set during the initialization phase
 925 */
 926#define BTRFS_QGROUP_STATUS_FLAG_SCANNING       (1ULL << 1)
 927/*
 928 * Some qgroup entries are known to be out of date,
 929 * either because the configuration has changed in a way that
 930 * makes a rescan necessary, or because the fs has been mounted
 931 * with a non-qgroup-aware version.
 932 * Turning qouta off and on again makes it inconsistent, too.
 933 */
 934#define BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT   (1ULL << 2)
 935
 936#define BTRFS_QGROUP_STATUS_VERSION        1
 937
 938struct btrfs_qgroup_status_item {
 939        __le64 version;
 940        /*
 941         * the generation is updated during every commit. As older
 942         * versions of btrfs are not aware of qgroups, it will be
 943         * possible to detect inconsistencies by checking the
 944         * generation on mount time
 945         */
 946        __le64 generation;
 947
 948        /* flag definitions see above */
 949        __le64 flags;
 950
 951        /*
 952         * only used during scanning to record the progress
 953         * of the scan. It contains a logical address
 954         */
 955        __le64 scan;
 956} __attribute__ ((__packed__));
 957
 958struct btrfs_qgroup_info_item {
 959        __le64 generation;
 960        __le64 rfer;
 961        __le64 rfer_cmpr;
 962        __le64 excl;
 963        __le64 excl_cmpr;
 964} __attribute__ ((__packed__));
 965
 966/* flags definition for qgroup limits */
 967#define BTRFS_QGROUP_LIMIT_MAX_RFER     (1ULL << 0)
 968#define BTRFS_QGROUP_LIMIT_MAX_EXCL     (1ULL << 1)
 969#define BTRFS_QGROUP_LIMIT_RSV_RFER     (1ULL << 2)
 970#define BTRFS_QGROUP_LIMIT_RSV_EXCL     (1ULL << 3)
 971#define BTRFS_QGROUP_LIMIT_RFER_CMPR    (1ULL << 4)
 972#define BTRFS_QGROUP_LIMIT_EXCL_CMPR    (1ULL << 5)
 973
 974struct btrfs_qgroup_limit_item {
 975        /*
 976         * only updated when any of the other values change
 977         */
 978        __le64 flags;
 979        __le64 max_rfer;
 980        __le64 max_excl;
 981        __le64 rsv_rfer;
 982        __le64 rsv_excl;
 983} __attribute__ ((__packed__));
 984
 985struct btrfs_space_info {
 986        u64 flags;
 987
 988        u64 total_bytes;        /* total bytes in the space,
 989                                   this doesn't take mirrors into account */
 990        u64 bytes_used;         /* total bytes used,
 991                                   this doesn't take mirrors into account */
 992        u64 bytes_pinned;       /* total bytes pinned, will be freed when the
 993                                   transaction finishes */
 994        u64 bytes_reserved;     /* total bytes the allocator has reserved for
 995                                   current allocations */
 996        u64 bytes_readonly;     /* total bytes that are read only */
 997
 998        u64 bytes_may_use;      /* number of bytes that may be used for
 999                                   delalloc/allocations */
1000        u64 disk_used;          /* total bytes used on disk */
1001        u64 disk_total;         /* total bytes on disk, takes mirrors into
1002                                   account */
1003
1004        /*
1005         * we bump reservation progress every time we decrement
1006         * bytes_reserved.  This way people waiting for reservations
1007         * know something good has happened and they can check
1008         * for progress.  The number here isn't to be trusted, it
1009         * just shows reclaim activity
1010         */
1011        unsigned long reservation_progress;
1012
1013        unsigned int full:1;    /* indicates that we cannot allocate any more
1014                                   chunks for this space */
1015        unsigned int chunk_alloc:1;     /* set if we are allocating a chunk */
1016
1017        unsigned int flush:1;           /* set if we are trying to make space */
1018
1019        unsigned int force_alloc;       /* set if we need to force a chunk
1020                                           alloc for this space */
1021
1022        struct list_head list;
1023
1024        /* for block groups in our same type */
1025        struct list_head block_groups[BTRFS_NR_RAID_TYPES];
1026        spinlock_t lock;
1027        struct rw_semaphore groups_sem;
1028        wait_queue_head_t wait;
1029};
1030
1031struct btrfs_block_rsv {
1032        u64 size;
1033        u64 reserved;
1034        struct btrfs_space_info *space_info;
1035        spinlock_t lock;
1036        unsigned int full;
1037};
1038
1039/*
1040 * free clusters are used to claim free space in relatively large chunks,
1041 * allowing us to do less seeky writes.  They are used for all metadata
1042 * allocations and data allocations in ssd mode.
1043 */
1044struct btrfs_free_cluster {
1045        spinlock_t lock;
1046        spinlock_t refill_lock;
1047        struct rb_root root;
1048
1049        /* largest extent in this cluster */
1050        u64 max_size;
1051
1052        /* first extent starting offset */
1053        u64 window_start;
1054
1055        struct btrfs_block_group_cache *block_group;
1056        /*
1057         * when a cluster is allocated from a block group, we put the
1058         * cluster onto a list in the block group so that it can
1059         * be freed before the block group is freed.
1060         */
1061        struct list_head block_group_list;
1062};
1063
1064enum btrfs_caching_type {
1065        BTRFS_CACHE_NO          = 0,
1066        BTRFS_CACHE_STARTED     = 1,
1067        BTRFS_CACHE_FAST        = 2,
1068        BTRFS_CACHE_FINISHED    = 3,
1069};
1070
1071enum btrfs_disk_cache_state {
1072        BTRFS_DC_WRITTEN        = 0,
1073        BTRFS_DC_ERROR          = 1,
1074        BTRFS_DC_CLEAR          = 2,
1075        BTRFS_DC_SETUP          = 3,
1076        BTRFS_DC_NEED_WRITE     = 4,
1077};
1078
1079struct btrfs_caching_control {
1080        struct list_head list;
1081        struct mutex mutex;
1082        wait_queue_head_t wait;
1083        struct btrfs_work work;
1084        struct btrfs_block_group_cache *block_group;
1085        u64 progress;
1086        atomic_t count;
1087};
1088
1089struct btrfs_block_group_cache {
1090        struct btrfs_key key;
1091        struct btrfs_block_group_item item;
1092        struct btrfs_fs_info *fs_info;
1093        struct inode *inode;
1094        spinlock_t lock;
1095        u64 pinned;
1096        u64 reserved;
1097        u64 bytes_super;
1098        u64 flags;
1099        u64 sectorsize;
1100        u64 cache_generation;
1101        unsigned int ro:1;
1102        unsigned int dirty:1;
1103        unsigned int iref:1;
1104
1105        int disk_cache_state;
1106
1107        /* cache tracking stuff */
1108        int cached;
1109        struct btrfs_caching_control *caching_ctl;
1110        u64 last_byte_to_unpin;
1111
1112        struct btrfs_space_info *space_info;
1113
1114        /* free space cache stuff */
1115        struct btrfs_free_space_ctl *free_space_ctl;
1116
1117        /* block group cache stuff */
1118        struct rb_node cache_node;
1119
1120        /* for block groups in the same raid type */
1121        struct list_head list;
1122
1123        /* usage count */
1124        atomic_t count;
1125
1126        /* List of struct btrfs_free_clusters for this block group.
1127         * Today it will only have one thing on it, but that may change
1128         */
1129        struct list_head cluster_list;
1130};
1131
1132/* delayed seq elem */
1133struct seq_list {
1134        struct list_head list;
1135        u64 seq;
1136};
1137
1138/* fs_info */
1139struct reloc_control;
1140struct btrfs_device;
1141struct btrfs_fs_devices;
1142struct btrfs_balance_control;
1143struct btrfs_delayed_root;
1144struct btrfs_fs_info {
1145        u8 fsid[BTRFS_FSID_SIZE];
1146        u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
1147        struct btrfs_root *extent_root;
1148        struct btrfs_root *tree_root;
1149        struct btrfs_root *chunk_root;
1150        struct btrfs_root *dev_root;
1151        struct btrfs_root *fs_root;
1152        struct btrfs_root *csum_root;
1153        struct btrfs_root *quota_root;
1154
1155        /* the log root tree is a directory of all the other log roots */
1156        struct btrfs_root *log_root_tree;
1157
1158        spinlock_t fs_roots_radix_lock;
1159        struct radix_tree_root fs_roots_radix;
1160
1161        /* block group cache stuff */
1162        spinlock_t block_group_cache_lock;
1163        struct rb_root block_group_cache_tree;
1164
1165        /* keep track of unallocated space */
1166        spinlock_t free_chunk_lock;
1167        u64 free_chunk_space;
1168
1169        struct extent_io_tree freed_extents[2];
1170        struct extent_io_tree *pinned_extents;
1171
1172        /* logical->physical extent mapping */
1173        struct btrfs_mapping_tree mapping_tree;
1174
1175        /*
1176         * block reservation for extent, checksum, root tree and
1177         * delayed dir index item
1178         */
1179        struct btrfs_block_rsv global_block_rsv;
1180        /* block reservation for delay allocation */
1181        struct btrfs_block_rsv delalloc_block_rsv;
1182        /* block reservation for metadata operations */
1183        struct btrfs_block_rsv trans_block_rsv;
1184        /* block reservation for chunk tree */
1185        struct btrfs_block_rsv chunk_block_rsv;
1186        /* block reservation for delayed operations */
1187        struct btrfs_block_rsv delayed_block_rsv;
1188
1189        struct btrfs_block_rsv empty_block_rsv;
1190
1191        u64 generation;
1192        u64 last_trans_committed;
1193
1194        /*
1195         * this is updated to the current trans every time a full commit
1196         * is required instead of the faster short fsync log commits
1197         */
1198        u64 last_trans_log_full_commit;
1199        unsigned long mount_opt;
1200        unsigned long compress_type:4;
1201        u64 max_inline;
1202        u64 alloc_start;
1203        struct btrfs_transaction *running_transaction;
1204        wait_queue_head_t transaction_throttle;
1205        wait_queue_head_t transaction_wait;
1206        wait_queue_head_t transaction_blocked_wait;
1207        wait_queue_head_t async_submit_wait;
1208
1209        struct btrfs_super_block *super_copy;
1210        struct btrfs_super_block *super_for_commit;
1211        struct block_device *__bdev;
1212        struct super_block *sb;
1213        struct inode *btree_inode;
1214        struct backing_dev_info bdi;
1215        struct mutex tree_log_mutex;
1216        struct mutex transaction_kthread_mutex;
1217        struct mutex cleaner_mutex;
1218        struct mutex chunk_mutex;
1219        struct mutex volume_mutex;
1220        /*
1221         * this protects the ordered operations list only while we are
1222         * processing all of the entries on it.  This way we make
1223         * sure the commit code doesn't find the list temporarily empty
1224         * because another function happens to be doing non-waiting preflush
1225         * before jumping into the main commit.
1226         */
1227        struct mutex ordered_operations_mutex;
1228        struct rw_semaphore extent_commit_sem;
1229
1230        struct rw_semaphore cleanup_work_sem;
1231
1232        struct rw_semaphore subvol_sem;
1233        struct srcu_struct subvol_srcu;
1234
1235        spinlock_t trans_lock;
1236        /*
1237         * the reloc mutex goes with the trans lock, it is taken
1238         * during commit to protect us from the relocation code
1239         */
1240        struct mutex reloc_mutex;
1241
1242        struct list_head trans_list;
1243        struct list_head hashers;
1244        struct list_head dead_roots;
1245        struct list_head caching_block_groups;
1246
1247        spinlock_t delayed_iput_lock;
1248        struct list_head delayed_iputs;
1249
1250        /* this protects tree_mod_seq_list */
1251        spinlock_t tree_mod_seq_lock;
1252        atomic_t tree_mod_seq;
1253        struct list_head tree_mod_seq_list;
1254        struct seq_list tree_mod_seq_elem;
1255
1256        /* this protects tree_mod_log */
1257        rwlock_t tree_mod_log_lock;
1258        struct rb_root tree_mod_log;
1259
1260        atomic_t nr_async_submits;
1261        atomic_t async_submit_draining;
1262        atomic_t nr_async_bios;
1263        atomic_t async_delalloc_pages;
1264        atomic_t open_ioctl_trans;
1265
1266        /*
1267         * this is used by the balancing code to wait for all the pending
1268         * ordered extents
1269         */
1270        spinlock_t ordered_extent_lock;
1271
1272        /*
1273         * all of the data=ordered extents pending writeback
1274         * these can span multiple transactions and basically include
1275         * every dirty data page that isn't from nodatacow
1276         */
1277        struct list_head ordered_extents;
1278
1279        /*
1280         * all of the inodes that have delalloc bytes.  It is possible for
1281         * this list to be empty even when there is still dirty data=ordered
1282         * extents waiting to finish IO.
1283         */
1284        struct list_head delalloc_inodes;
1285
1286        /*
1287         * special rename and truncate targets that must be on disk before
1288         * we're allowed to commit.  This is basically the ext3 style
1289         * data=ordered list.
1290         */
1291        struct list_head ordered_operations;
1292
1293        /*
1294         * there is a pool of worker threads for checksumming during writes
1295         * and a pool for checksumming after reads.  This is because readers
1296         * can run with FS locks held, and the writers may be waiting for
1297         * those locks.  We don't want ordering in the pending list to cause
1298         * deadlocks, and so the two are serviced separately.
1299         *
1300         * A third pool does submit_bio to avoid deadlocking with the other
1301         * two
1302         */
1303        struct btrfs_workers generic_worker;
1304        struct btrfs_workers workers;
1305        struct btrfs_workers delalloc_workers;
1306        struct btrfs_workers endio_workers;
1307        struct btrfs_workers endio_meta_workers;
1308        struct btrfs_workers endio_meta_write_workers;
1309        struct btrfs_workers endio_write_workers;
1310        struct btrfs_workers endio_freespace_worker;
1311        struct btrfs_workers submit_workers;
1312        struct btrfs_workers caching_workers;
1313        struct btrfs_workers readahead_workers;
1314
1315        /*
1316         * fixup workers take dirty pages that didn't properly go through
1317         * the cow mechanism and make them safe to write.  It happens
1318         * for the sys_munmap function call path
1319         */
1320        struct btrfs_workers fixup_workers;
1321        struct btrfs_workers delayed_workers;
1322        struct task_struct *transaction_kthread;
1323        struct task_struct *cleaner_kthread;
1324        int thread_pool_size;
1325
1326        struct kobject super_kobj;
1327        struct completion kobj_unregister;
1328        int do_barriers;
1329        int closing;
1330        int log_root_recovering;
1331        int enospc_unlink;
1332        int trans_no_join;
1333
1334        u64 total_pinned;
1335
1336        /* protected by the delalloc lock, used to keep from writing
1337         * metadata until there is a nice batch
1338         */
1339        u64 dirty_metadata_bytes;
1340        struct list_head dirty_cowonly_roots;
1341
1342        struct btrfs_fs_devices *fs_devices;
1343
1344        /*
1345         * the space_info list is almost entirely read only.  It only changes
1346         * when we add a new raid type to the FS, and that happens
1347         * very rarely.  RCU is used to protect it.
1348         */
1349        struct list_head space_info;
1350
1351        struct btrfs_space_info *data_sinfo;
1352
1353        struct reloc_control *reloc_ctl;
1354
1355        spinlock_t delalloc_lock;
1356        u64 delalloc_bytes;
1357
1358        /* data_alloc_cluster is only used in ssd mode */
1359        struct btrfs_free_cluster data_alloc_cluster;
1360
1361        /* all metadata allocations go through this cluster */
1362        struct btrfs_free_cluster meta_alloc_cluster;
1363
1364        /* auto defrag inodes go here */
1365        spinlock_t defrag_inodes_lock;
1366        struct rb_root defrag_inodes;
1367        atomic_t defrag_running;
1368
1369        spinlock_t ref_cache_lock;
1370        u64 total_ref_cache_size;
1371
1372        /*
1373         * these three are in extended format (availability of single
1374         * chunks is denoted by BTRFS_AVAIL_ALLOC_BIT_SINGLE bit, other
1375         * types are denoted by corresponding BTRFS_BLOCK_GROUP_* bits)
1376         */
1377        u64 avail_data_alloc_bits;
1378        u64 avail_metadata_alloc_bits;
1379        u64 avail_system_alloc_bits;
1380
1381        /* restriper state */
1382        spinlock_t balance_lock;
1383        struct mutex balance_mutex;
1384        atomic_t balance_running;
1385        atomic_t balance_pause_req;
1386        atomic_t balance_cancel_req;
1387        struct btrfs_balance_control *balance_ctl;
1388        wait_queue_head_t balance_wait_q;
1389
1390        unsigned data_chunk_allocations;
1391        unsigned metadata_ratio;
1392
1393        void *bdev_holder;
1394
1395        /* private scrub information */
1396        struct mutex scrub_lock;
1397        atomic_t scrubs_running;
1398        atomic_t scrub_pause_req;
1399        atomic_t scrubs_paused;
1400        atomic_t scrub_cancel_req;
1401        wait_queue_head_t scrub_pause_wait;
1402        struct rw_semaphore scrub_super_lock;
1403        int scrub_workers_refcnt;
1404        struct btrfs_workers scrub_workers;
1405
1406#ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY
1407        u32 check_integrity_print_mask;
1408#endif
1409        /*
1410         * quota information
1411         */
1412        unsigned int quota_enabled:1;
1413
1414        /*
1415         * quota_enabled only changes state after a commit. This holds the
1416         * next state.
1417         */
1418        unsigned int pending_quota_state:1;
1419
1420        /* is qgroup tracking in a consistent state? */
1421        u64 qgroup_flags;
1422
1423        /* holds configuration and tracking. Protected by qgroup_lock */
1424        struct rb_root qgroup_tree;
1425        spinlock_t qgroup_lock;
1426
1427        /* list of dirty qgroups to be written at next commit */
1428        struct list_head dirty_qgroups;
1429
1430        /* used by btrfs_qgroup_record_ref for an efficient tree traversal */
1431        u64 qgroup_seq;
1432
1433        /* filesystem state */
1434        u64 fs_state;
1435
1436        struct btrfs_delayed_root *delayed_root;
1437
1438        /* readahead tree */
1439        spinlock_t reada_lock;
1440        struct radix_tree_root reada_tree;
1441
1442        /* next backup root to be overwritten */
1443        int backup_root_index;
1444};
1445
1446/*
1447 * in ram representation of the tree.  extent_root is used for all allocations
1448 * and for the extent tree extent_root root.
1449 */
1450struct btrfs_root {
1451        struct extent_buffer *node;
1452
1453        struct extent_buffer *commit_root;
1454        struct btrfs_root *log_root;
1455        struct btrfs_root *reloc_root;
1456
1457        struct btrfs_root_item root_item;
1458        struct btrfs_key root_key;
1459        struct btrfs_fs_info *fs_info;
1460        struct extent_io_tree dirty_log_pages;
1461
1462        struct kobject root_kobj;
1463        struct completion kobj_unregister;
1464        struct mutex objectid_mutex;
1465
1466        spinlock_t accounting_lock;
1467        struct btrfs_block_rsv *block_rsv;
1468
1469        /* free ino cache stuff */
1470        struct mutex fs_commit_mutex;
1471        struct btrfs_free_space_ctl *free_ino_ctl;
1472        enum btrfs_caching_type cached;
1473        spinlock_t cache_lock;
1474        wait_queue_head_t cache_wait;
1475        struct btrfs_free_space_ctl *free_ino_pinned;
1476        u64 cache_progress;
1477        struct inode *cache_inode;
1478
1479        struct mutex log_mutex;
1480        wait_queue_head_t log_writer_wait;
1481        wait_queue_head_t log_commit_wait[2];
1482        atomic_t log_writers;
1483        atomic_t log_commit[2];
1484        unsigned long log_transid;
1485        unsigned long last_log_commit;
1486        unsigned long log_batch;
1487        pid_t log_start_pid;
1488        bool log_multiple_pids;
1489
1490        u64 objectid;
1491        u64 last_trans;
1492
1493        /* data allocations are done in sectorsize units */
1494        u32 sectorsize;
1495
1496        /* node allocations are done in nodesize units */
1497        u32 nodesize;
1498
1499        /* leaf allocations are done in leafsize units */
1500        u32 leafsize;
1501
1502        u32 stripesize;
1503
1504        u32 type;
1505
1506        u64 highest_objectid;
1507
1508        /* btrfs_record_root_in_trans is a multi-step process,
1509         * and it can race with the balancing code.   But the
1510         * race is very small, and only the first time the root
1511         * is added to each transaction.  So in_trans_setup
1512         * is used to tell us when more checks are required
1513         */
1514        unsigned long in_trans_setup;
1515        int ref_cows;
1516        int track_dirty;
1517        int in_radix;
1518
1519        u64 defrag_trans_start;
1520        struct btrfs_key defrag_progress;
1521        struct btrfs_key defrag_max;
1522        int defrag_running;
1523        char *name;
1524
1525        /* the dirty list is only used by non-reference counted roots */
1526        struct list_head dirty_list;
1527
1528        struct list_head root_list;
1529
1530        spinlock_t orphan_lock;
1531        atomic_t orphan_inodes;
1532        struct btrfs_block_rsv *orphan_block_rsv;
1533        int orphan_item_inserted;
1534        int orphan_cleanup_state;
1535
1536        spinlock_t inode_lock;
1537        /* red-black tree that keeps track of in-memory inodes */
1538        struct rb_root inode_tree;
1539
1540        /*
1541         * radix tree that keeps track of delayed nodes of every inode,
1542         * protected by inode_lock
1543         */
1544        struct radix_tree_root delayed_nodes_tree;
1545        /*
1546         * right now this just gets used so that a root has its own devid
1547         * for stat.  It may be used for more later
1548         */
1549        dev_t anon_dev;
1550
1551        int force_cow;
1552
1553        spinlock_t root_times_lock;
1554};
1555
1556struct btrfs_ioctl_defrag_range_args {
1557        /* start of the defrag operation */
1558        __u64 start;
1559
1560        /* number of bytes to defrag, use (u64)-1 to say all */
1561        __u64 len;
1562
1563        /*
1564         * flags for the operation, which can include turning
1565         * on compression for this one defrag
1566         */
1567        __u64 flags;
1568
1569        /*
1570         * any extent bigger than this will be considered
1571         * already defragged.  Use 0 to take the kernel default
1572         * Use 1 to say every single extent must be rewritten
1573         */
1574        __u32 extent_thresh;
1575
1576        /*
1577         * which compression method to use if turning on compression
1578         * for this defrag operation.  If unspecified, zlib will
1579         * be used
1580         */
1581        __u32 compress_type;
1582
1583        /* spare for later */
1584        __u32 unused[4];
1585};
1586
1587
1588/*
1589 * inode items have the data typically returned from stat and store other
1590 * info about object characteristics.  There is one for every file and dir in
1591 * the FS
1592 */
1593#define BTRFS_INODE_ITEM_KEY            1
1594#define BTRFS_INODE_REF_KEY             12
1595#define BTRFS_XATTR_ITEM_KEY            24
1596#define BTRFS_ORPHAN_ITEM_KEY           48
1597/* reserve 2-15 close to the inode for later flexibility */
1598
1599/*
1600 * dir items are the name -> inode pointers in a directory.  There is one
1601 * for every name in a directory.
1602 */
1603#define BTRFS_DIR_LOG_ITEM_KEY  60
1604#define BTRFS_DIR_LOG_INDEX_KEY 72
1605#define BTRFS_DIR_ITEM_KEY      84
1606#define BTRFS_DIR_INDEX_KEY     96
1607/*
1608 * extent data is for file data
1609 */
1610#define BTRFS_EXTENT_DATA_KEY   108
1611
1612/*
1613 * extent csums are stored in a separate tree and hold csums for
1614 * an entire extent on disk.
1615 */
1616#define BTRFS_EXTENT_CSUM_KEY   128
1617
1618/*
1619 * root items point to tree roots.  They are typically in the root
1620 * tree used by the super block to find all the other trees
1621 */
1622#define BTRFS_ROOT_ITEM_KEY     132
1623
1624/*
1625 * root backrefs tie subvols and snapshots to the directory entries that
1626 * reference them
1627 */
1628#define BTRFS_ROOT_BACKREF_KEY  144
1629
1630/*
1631 * root refs make a fast index for listing all of the snapshots and
1632 * subvolumes referenced by a given root.  They point directly to the
1633 * directory item in the root that references the subvol
1634 */
1635#define BTRFS_ROOT_REF_KEY      156
1636
1637/*
1638 * extent items are in the extent map tree.  These record which blocks
1639 * are used, and how many references there are to each block
1640 */
1641#define BTRFS_EXTENT_ITEM_KEY   168
1642
1643#define BTRFS_TREE_BLOCK_REF_KEY        176
1644
1645#define BTRFS_EXTENT_DATA_REF_KEY       178
1646
1647#define BTRFS_EXTENT_REF_V0_KEY         180
1648
1649#define BTRFS_SHARED_BLOCK_REF_KEY      182
1650
1651#define BTRFS_SHARED_DATA_REF_KEY       184
1652
1653/*
1654 * block groups give us hints into the extent allocation trees.  Which
1655 * blocks are free etc etc
1656 */
1657#define BTRFS_BLOCK_GROUP_ITEM_KEY 192
1658
1659#define BTRFS_DEV_EXTENT_KEY    204
1660#define BTRFS_DEV_ITEM_KEY      216
1661#define BTRFS_CHUNK_ITEM_KEY    228
1662
1663/*
1664 * Records the overall state of the qgroups.
1665 * There's only one instance of this key present,
1666 * (0, BTRFS_QGROUP_STATUS_KEY, 0)
1667 */
1668#define BTRFS_QGROUP_STATUS_KEY         240
1669/*
1670 * Records the currently used space of the qgroup.
1671 * One key per qgroup, (0, BTRFS_QGROUP_INFO_KEY, qgroupid).
1672 */
1673#define BTRFS_QGROUP_INFO_KEY           242
1674/*
1675 * Contains the user configured limits for the qgroup.
1676 * One key per qgroup, (0, BTRFS_QGROUP_LIMIT_KEY, qgroupid).
1677 */
1678#define BTRFS_QGROUP_LIMIT_KEY          244
1679/*
1680 * Records the child-parent relationship of qgroups. For
1681 * each relation, 2 keys are present:
1682 * (childid, BTRFS_QGROUP_RELATION_KEY, parentid)
1683 * (parentid, BTRFS_QGROUP_RELATION_KEY, childid)
1684 */
1685#define BTRFS_QGROUP_RELATION_KEY       246
1686
1687#define BTRFS_BALANCE_ITEM_KEY  248
1688
1689/*
1690 * Persistantly stores the io stats in the device tree.
1691 * One key for all stats, (0, BTRFS_DEV_STATS_KEY, devid).
1692 */
1693#define BTRFS_DEV_STATS_KEY     249
1694
1695/*
1696 * string items are for debugging.  They just store a short string of
1697 * data in the FS
1698 */
1699#define BTRFS_STRING_ITEM_KEY   253
1700
1701/*
1702 * Flags for mount options.
1703 *
1704 * Note: don't forget to add new options to btrfs_show_options()
1705 */
1706#define BTRFS_MOUNT_NODATASUM           (1 << 0)
1707#define BTRFS_MOUNT_NODATACOW           (1 << 1)
1708#define BTRFS_MOUNT_NOBARRIER           (1 << 2)
1709#define BTRFS_MOUNT_SSD                 (1 << 3)
1710#define BTRFS_MOUNT_DEGRADED            (1 << 4)
1711#define BTRFS_MOUNT_COMPRESS            (1 << 5)
1712#define BTRFS_MOUNT_NOTREELOG           (1 << 6)
1713#define BTRFS_MOUNT_FLUSHONCOMMIT       (1 << 7)
1714#define BTRFS_MOUNT_SSD_SPREAD          (1 << 8)
1715#define BTRFS_MOUNT_NOSSD               (1 << 9)
1716#define BTRFS_MOUNT_DISCARD             (1 << 10)
1717#define BTRFS_MOUNT_FORCE_COMPRESS      (1 << 11)
1718#define BTRFS_MOUNT_SPACE_CACHE         (1 << 12)
1719#define BTRFS_MOUNT_CLEAR_CACHE         (1 << 13)
1720#define BTRFS_MOUNT_USER_SUBVOL_RM_ALLOWED (1 << 14)
1721#define BTRFS_MOUNT_ENOSPC_DEBUG         (1 << 15)
1722#define BTRFS_MOUNT_AUTO_DEFRAG         (1 << 16)
1723#define BTRFS_MOUNT_INODE_MAP_CACHE     (1 << 17)
1724#define BTRFS_MOUNT_RECOVERY            (1 << 18)
1725#define BTRFS_MOUNT_SKIP_BALANCE        (1 << 19)
1726#define BTRFS_MOUNT_CHECK_INTEGRITY     (1 << 20)
1727#define BTRFS_MOUNT_CHECK_INTEGRITY_INCLUDING_EXTENT_DATA (1 << 21)
1728#define BTRFS_MOUNT_PANIC_ON_FATAL_ERROR        (1 << 22)
1729
1730#define btrfs_clear_opt(o, opt)         ((o) &= ~BTRFS_MOUNT_##opt)
1731#define btrfs_set_opt(o, opt)           ((o) |= BTRFS_MOUNT_##opt)
1732#define btrfs_test_opt(root, opt)       ((root)->fs_info->mount_opt & \
1733                                         BTRFS_MOUNT_##opt)
1734/*
1735 * Inode flags
1736 */
1737#define BTRFS_INODE_NODATASUM           (1 << 0)
1738#define BTRFS_INODE_NODATACOW           (1 << 1)
1739#define BTRFS_INODE_READONLY            (1 << 2)
1740#define BTRFS_INODE_NOCOMPRESS          (1 << 3)
1741#define BTRFS_INODE_PREALLOC            (1 << 4)
1742#define BTRFS_INODE_SYNC                (1 << 5)
1743#define BTRFS_INODE_IMMUTABLE           (1 << 6)
1744#define BTRFS_INODE_APPEND              (1 << 7)
1745#define BTRFS_INODE_NODUMP              (1 << 8)
1746#define BTRFS_INODE_NOATIME             (1 << 9)
1747#define BTRFS_INODE_DIRSYNC             (1 << 10)
1748#define BTRFS_INODE_COMPRESS            (1 << 11)
1749
1750#define BTRFS_INODE_ROOT_ITEM_INIT      (1 << 31)
1751
1752struct btrfs_map_token {
1753        struct extent_buffer *eb;
1754        char *kaddr;
1755        unsigned long offset;
1756};
1757
1758static inline void btrfs_init_map_token (struct btrfs_map_token *token)
1759{
1760        memset(token, 0, sizeof(*token));
1761}
1762
1763/* some macros to generate set/get funcs for the struct fields.  This
1764 * assumes there is a lefoo_to_cpu for every type, so lets make a simple
1765 * one for u8:
1766 */
1767#define le8_to_cpu(v) (v)
1768#define cpu_to_le8(v) (v)
1769#define __le8 u8
1770
1771#define read_eb_member(eb, ptr, type, member, result) (                 \
1772        read_extent_buffer(eb, (char *)(result),                        \
1773                           ((unsigned long)(ptr)) +                     \
1774                            offsetof(type, member),                     \
1775                           sizeof(((type *)0)->member)))
1776
1777#define write_eb_member(eb, ptr, type, member, result) (                \
1778        write_extent_buffer(eb, (char *)(result),                       \
1779                           ((unsigned long)(ptr)) +                     \
1780                            offsetof(type, member),                     \
1781                           sizeof(((type *)0)->member)))
1782
1783#define DECLARE_BTRFS_SETGET_BITS(bits)                                 \
1784u##bits btrfs_get_token_##bits(struct extent_buffer *eb, void *ptr,     \
1785                               unsigned long off,                       \
1786                              struct btrfs_map_token *token);           \
1787void btrfs_set_token_##bits(struct extent_buffer *eb, void *ptr,        \
1788                            unsigned long off, u##bits val,             \
1789                            struct btrfs_map_token *token);             \
1790static inline u##bits btrfs_get_##bits(struct extent_buffer *eb, void *ptr, \
1791                                       unsigned long off)               \
1792{                                                                       \
1793        return btrfs_get_token_##bits(eb, ptr, off, NULL);              \
1794}                                                                       \
1795static inline void btrfs_set_##bits(struct extent_buffer *eb, void *ptr, \
1796                                    unsigned long off, u##bits val)     \
1797{                                                                       \
1798       btrfs_set_token_##bits(eb, ptr, off, val, NULL);                 \
1799}
1800
1801DECLARE_BTRFS_SETGET_BITS(8)
1802DECLARE_BTRFS_SETGET_BITS(16)
1803DECLARE_BTRFS_SETGET_BITS(32)
1804DECLARE_BTRFS_SETGET_BITS(64)
1805
1806#define BTRFS_SETGET_FUNCS(name, type, member, bits)                    \
1807static inline u##bits btrfs_##name(struct extent_buffer *eb, type *s)   \
1808{                                                                       \
1809        BUILD_BUG_ON(sizeof(u##bits) != sizeof(((type *)0))->member);   \
1810        return btrfs_get_##bits(eb, s, offsetof(type, member));         \
1811}                                                                       \
1812static inline void btrfs_set_##name(struct extent_buffer *eb, type *s,  \
1813                                    u##bits val)                        \
1814{                                                                       \
1815        BUILD_BUG_ON(sizeof(u##bits) != sizeof(((type *)0))->member);   \
1816        btrfs_set_##bits(eb, s, offsetof(type, member), val);           \
1817}                                                                       \
1818static inline u##bits btrfs_token_##name(struct extent_buffer *eb, type *s, \
1819                                         struct btrfs_map_token *token) \
1820{                                                                       \
1821        BUILD_BUG_ON(sizeof(u##bits) != sizeof(((type *)0))->member);   \
1822        return btrfs_get_token_##bits(eb, s, offsetof(type, member), token); \
1823}                                                                       \
1824static inline void btrfs_set_token_##name(struct extent_buffer *eb,     \
1825                                          type *s, u##bits val,         \
1826                                         struct btrfs_map_token *token) \
1827{                                                                       \
1828        BUILD_BUG_ON(sizeof(u##bits) != sizeof(((type *)0))->member);   \
1829        btrfs_set_token_##bits(eb, s, offsetof(type, member), val, token); \
1830}
1831
1832#define BTRFS_SETGET_HEADER_FUNCS(name, type, member, bits)             \
1833static inline u##bits btrfs_##name(struct extent_buffer *eb)            \
1834{                                                                       \
1835        type *p = page_address(eb->pages[0]);                           \
1836        u##bits res = le##bits##_to_cpu(p->member);                     \
1837        return res;                                                     \
1838}                                                                       \
1839static inline void btrfs_set_##name(struct extent_buffer *eb,           \
1840                                    u##bits val)                        \
1841{                                                                       \
1842        type *p = page_address(eb->pages[0]);                           \
1843        p->member = cpu_to_le##bits(val);                               \
1844}
1845
1846#define BTRFS_SETGET_STACK_FUNCS(name, type, member, bits)              \
1847static inline u##bits btrfs_##name(type *s)                             \
1848{                                                                       \
1849        return le##bits##_to_cpu(s->member);                            \
1850}                                                                       \
1851static inline void btrfs_set_##name(type *s, u##bits val)               \
1852{                                                                       \
1853        s->member = cpu_to_le##bits(val);                               \
1854}
1855
1856BTRFS_SETGET_FUNCS(device_type, struct btrfs_dev_item, type, 64);
1857BTRFS_SETGET_FUNCS(device_total_bytes, struct btrfs_dev_item, total_bytes, 64);
1858BTRFS_SETGET_FUNCS(device_bytes_used, struct btrfs_dev_item, bytes_used, 64);
1859BTRFS_SETGET_FUNCS(device_io_align, struct btrfs_dev_item, io_align, 32);
1860BTRFS_SETGET_FUNCS(device_io_width, struct btrfs_dev_item, io_width, 32);
1861BTRFS_SETGET_FUNCS(device_start_offset, struct btrfs_dev_item,
1862                   start_offset, 64);
1863BTRFS_SETGET_FUNCS(device_sector_size, struct btrfs_dev_item, sector_size, 32);
1864BTRFS_SETGET_FUNCS(device_id, struct btrfs_dev_item, devid, 64);
1865BTRFS_SETGET_FUNCS(device_group, struct btrfs_dev_item, dev_group, 32);
1866BTRFS_SETGET_FUNCS(device_seek_speed, struct btrfs_dev_item, seek_speed, 8);
1867BTRFS_SETGET_FUNCS(device_bandwidth, struct btrfs_dev_item, bandwidth, 8);
1868BTRFS_SETGET_FUNCS(device_generation, struct btrfs_dev_item, generation, 64);
1869
1870BTRFS_SETGET_STACK_FUNCS(stack_device_type, struct btrfs_dev_item, type, 64);
1871BTRFS_SETGET_STACK_FUNCS(stack_device_total_bytes, struct btrfs_dev_item,
1872                         total_bytes, 64);
1873BTRFS_SETGET_STACK_FUNCS(stack_device_bytes_used, struct btrfs_dev_item,
1874                         bytes_used, 64);
1875BTRFS_SETGET_STACK_FUNCS(stack_device_io_align, struct btrfs_dev_item,
1876                         io_align, 32);
1877BTRFS_SETGET_STACK_FUNCS(stack_device_io_width, struct btrfs_dev_item,
1878                         io_width, 32);
1879BTRFS_SETGET_STACK_FUNCS(stack_device_sector_size, struct btrfs_dev_item,
1880                         sector_size, 32);
1881BTRFS_SETGET_STACK_FUNCS(stack_device_id, struct btrfs_dev_item, devid, 64);
1882BTRFS_SETGET_STACK_FUNCS(stack_device_group, struct btrfs_dev_item,
1883                         dev_group, 32);
1884BTRFS_SETGET_STACK_FUNCS(stack_device_seek_speed, struct btrfs_dev_item,
1885                         seek_speed, 8);
1886BTRFS_SETGET_STACK_FUNCS(stack_device_bandwidth, struct btrfs_dev_item,
1887                         bandwidth, 8);
1888BTRFS_SETGET_STACK_FUNCS(stack_device_generation, struct btrfs_dev_item,
1889                         generation, 64);
1890
1891static inline char *btrfs_device_uuid(struct btrfs_dev_item *d)
1892{
1893        return (char *)d + offsetof(struct btrfs_dev_item, uuid);
1894}
1895
1896static inline char *btrfs_device_fsid(struct btrfs_dev_item *d)
1897{
1898        return (char *)d + offsetof(struct btrfs_dev_item, fsid);
1899}
1900
1901BTRFS_SETGET_FUNCS(chunk_length, struct btrfs_chunk, length, 64);
1902BTRFS_SETGET_FUNCS(chunk_owner, struct btrfs_chunk, owner, 64);
1903BTRFS_SETGET_FUNCS(chunk_stripe_len, struct btrfs_chunk, stripe_len, 64);
1904BTRFS_SETGET_FUNCS(chunk_io_align, struct btrfs_chunk, io_align, 32);
1905BTRFS_SETGET_FUNCS(chunk_io_width, struct btrfs_chunk, io_width, 32);
1906BTRFS_SETGET_FUNCS(chunk_sector_size, struct btrfs_chunk, sector_size, 32);
1907BTRFS_SETGET_FUNCS(chunk_type, struct btrfs_chunk, type, 64);
1908BTRFS_SETGET_FUNCS(chunk_num_stripes, struct btrfs_chunk, num_stripes, 16);
1909BTRFS_SETGET_FUNCS(chunk_sub_stripes, struct btrfs_chunk, sub_stripes, 16);
1910BTRFS_SETGET_FUNCS(stripe_devid, struct btrfs_stripe, devid, 64);
1911BTRFS_SETGET_FUNCS(stripe_offset, struct btrfs_stripe, offset, 64);
1912
1913static inline char *btrfs_stripe_dev_uuid(struct btrfs_stripe *s)
1914{
1915        return (char *)s + offsetof(struct btrfs_stripe, dev_uuid);
1916}
1917
1918BTRFS_SETGET_STACK_FUNCS(stack_chunk_length, struct btrfs_chunk, length, 64);
1919BTRFS_SETGET_STACK_FUNCS(stack_chunk_owner, struct btrfs_chunk, owner, 64);
1920BTRFS_SETGET_STACK_FUNCS(stack_chunk_stripe_len, struct btrfs_chunk,
1921                         stripe_len, 64);
1922BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_align, struct btrfs_chunk,
1923                         io_align, 32);
1924BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_width, struct btrfs_chunk,
1925                         io_width, 32);
1926BTRFS_SETGET_STACK_FUNCS(stack_chunk_sector_size, struct btrfs_chunk,
1927                         sector_size, 32);
1928BTRFS_SETGET_STACK_FUNCS(stack_chunk_type, struct btrfs_chunk, type, 64);
1929BTRFS_SETGET_STACK_FUNCS(stack_chunk_num_stripes, struct btrfs_chunk,
1930                         num_stripes, 16);
1931BTRFS_SETGET_STACK_FUNCS(stack_chunk_sub_stripes, struct btrfs_chunk,
1932                         sub_stripes, 16);
1933BTRFS_SETGET_STACK_FUNCS(stack_stripe_devid, struct btrfs_stripe, devid, 64);
1934BTRFS_SETGET_STACK_FUNCS(stack_stripe_offset, struct btrfs_stripe, offset, 64);
1935
1936static inline struct btrfs_stripe *btrfs_stripe_nr(struct btrfs_chunk *c,
1937                                                   int nr)
1938{
1939        unsigned long offset = (unsigned long)c;
1940        offset += offsetof(struct btrfs_chunk, stripe);
1941        offset += nr * sizeof(struct btrfs_stripe);
1942        return (struct btrfs_stripe *)offset;
1943}
1944
1945static inline char *btrfs_stripe_dev_uuid_nr(struct btrfs_chunk *c, int nr)
1946{
1947        return btrfs_stripe_dev_uuid(btrfs_stripe_nr(c, nr));
1948}
1949
1950static inline u64 btrfs_stripe_offset_nr(struct extent_buffer *eb,
1951                                         struct btrfs_chunk *c, int nr)
1952{
1953        return btrfs_stripe_offset(eb, btrfs_stripe_nr(c, nr));
1954}
1955
1956static inline u64 btrfs_stripe_devid_nr(struct extent_buffer *eb,
1957                                         struct btrfs_chunk *c, int nr)
1958{
1959        return btrfs_stripe_devid(eb, btrfs_stripe_nr(c, nr));
1960}
1961
1962/* struct btrfs_block_group_item */
1963BTRFS_SETGET_STACK_FUNCS(block_group_used, struct btrfs_block_group_item,
1964                         used, 64);
1965BTRFS_SETGET_FUNCS(disk_block_group_used, struct btrfs_block_group_item,
1966                         used, 64);
1967BTRFS_SETGET_STACK_FUNCS(block_group_chunk_objectid,
1968                        struct btrfs_block_group_item, chunk_objectid, 64);
1969
1970BTRFS_SETGET_FUNCS(disk_block_group_chunk_objectid,
1971                   struct btrfs_block_group_item, chunk_objectid, 64);
1972BTRFS_SETGET_FUNCS(disk_block_group_flags,
1973                   struct btrfs_block_group_item, flags, 64);
1974BTRFS_SETGET_STACK_FUNCS(block_group_flags,
1975                        struct btrfs_block_group_item, flags, 64);
1976
1977/* struct btrfs_inode_ref */
1978BTRFS_SETGET_FUNCS(inode_ref_name_len, struct btrfs_inode_ref, name_len, 16);
1979BTRFS_SETGET_FUNCS(inode_ref_index, struct btrfs_inode_ref, index, 64);
1980
1981/* struct btrfs_inode_item */
1982BTRFS_SETGET_FUNCS(inode_generation, struct btrfs_inode_item, generation, 64);
1983BTRFS_SETGET_FUNCS(inode_sequence, struct btrfs_inode_item, sequence, 64);
1984BTRFS_SETGET_FUNCS(inode_transid, struct btrfs_inode_item, transid, 64);
1985BTRFS_SETGET_FUNCS(inode_size, struct btrfs_inode_item, size, 64);
1986BTRFS_SETGET_FUNCS(inode_nbytes, struct btrfs_inode_item, nbytes, 64);
1987BTRFS_SETGET_FUNCS(inode_block_group, struct btrfs_inode_item, block_group, 64);
1988BTRFS_SETGET_FUNCS(inode_nlink, struct btrfs_inode_item, nlink, 32);
1989BTRFS_SETGET_FUNCS(inode_uid, struct btrfs_inode_item, uid, 32);
1990BTRFS_SETGET_FUNCS(inode_gid, struct btrfs_inode_item, gid, 32);
1991BTRFS_SETGET_FUNCS(inode_mode, struct btrfs_inode_item, mode, 32);
1992BTRFS_SETGET_FUNCS(inode_rdev, struct btrfs_inode_item, rdev, 64);
1993BTRFS_SETGET_FUNCS(inode_flags, struct btrfs_inode_item, flags, 64);
1994
1995static inline struct btrfs_timespec *
1996btrfs_inode_atime(struct btrfs_inode_item *inode_item)
1997{
1998        unsigned long ptr = (unsigned long)inode_item;
1999        ptr += offsetof(struct btrfs_inode_item, atime);
2000        return (struct btrfs_timespec *)ptr;
2001}
2002
2003static inline struct btrfs_timespec *
2004btrfs_inode_mtime(struct btrfs_inode_item *inode_item)
2005{
2006        unsigned long ptr = (unsigned long)inode_item;
2007        ptr += offsetof(struct btrfs_inode_item, mtime);
2008        return (struct btrfs_timespec *)ptr;
2009}
2010
2011static inline struct btrfs_timespec *
2012btrfs_inode_ctime(struct btrfs_inode_item *inode_item)
2013{
2014        unsigned long ptr = (unsigned long)inode_item;
2015        ptr += offsetof(struct btrfs_inode_item, ctime);
2016        return (struct btrfs_timespec *)ptr;
2017}
2018
2019BTRFS_SETGET_FUNCS(timespec_sec, struct btrfs_timespec, sec, 64);
2020BTRFS_SETGET_FUNCS(timespec_nsec, struct btrfs_timespec, nsec, 32);
2021
2022/* struct btrfs_dev_extent */
2023BTRFS_SETGET_FUNCS(dev_extent_chunk_tree, struct btrfs_dev_extent,
2024                   chunk_tree, 64);
2025BTRFS_SETGET_FUNCS(dev_extent_chunk_objectid, struct btrfs_dev_extent,
2026                   chunk_objectid, 64);
2027BTRFS_SETGET_FUNCS(dev_extent_chunk_offset, struct btrfs_dev_extent,
2028                   chunk_offset, 64);
2029BTRFS_SETGET_FUNCS(dev_extent_length, struct btrfs_dev_extent, length, 64);
2030
2031static inline u8 *btrfs_dev_extent_chunk_tree_uuid(struct btrfs_dev_extent *dev)
2032{
2033        unsigned long ptr = offsetof(struct btrfs_dev_extent, chunk_tree_uuid);
2034        return (u8 *)((unsigned long)dev + ptr);
2035}
2036
2037BTRFS_SETGET_FUNCS(extent_refs, struct btrfs_extent_item, refs, 64);
2038BTRFS_SETGET_FUNCS(extent_generation, struct btrfs_extent_item,
2039                   generation, 64);
2040BTRFS_SETGET_FUNCS(extent_flags, struct btrfs_extent_item, flags, 64);
2041
2042BTRFS_SETGET_FUNCS(extent_refs_v0, struct btrfs_extent_item_v0, refs, 32);
2043
2044
2045BTRFS_SETGET_FUNCS(tree_block_level, struct btrfs_tree_block_info, level, 8);
2046
2047static inline void btrfs_tree_block_key(struct extent_buffer *eb,
2048                                        struct btrfs_tree_block_info *item,
2049                                        struct btrfs_disk_key *key)
2050{
2051        read_eb_member(eb, item, struct btrfs_tree_block_info, key, key);
2052}
2053
2054static inline void btrfs_set_tree_block_key(struct extent_buffer *eb,
2055                                            struct btrfs_tree_block_info *item,
2056                                            struct btrfs_disk_key *key)
2057{
2058        write_eb_member(eb, item, struct btrfs_tree_block_info, key, key);
2059}
2060
2061BTRFS_SETGET_FUNCS(extent_data_ref_root, struct btrfs_extent_data_ref,
2062                   root, 64);
2063BTRFS_SETGET_FUNCS(extent_data_ref_objectid, struct btrfs_extent_data_ref,
2064                   objectid, 64);
2065BTRFS_SETGET_FUNCS(extent_data_ref_offset, struct btrfs_extent_data_ref,
2066                   offset, 64);
2067BTRFS_SETGET_FUNCS(extent_data_ref_count, struct btrfs_extent_data_ref,
2068                   count, 32);
2069
2070BTRFS_SETGET_FUNCS(shared_data_ref_count, struct btrfs_shared_data_ref,
2071                   count, 32);
2072
2073BTRFS_SETGET_FUNCS(extent_inline_ref_type, struct btrfs_extent_inline_ref,
2074                   type, 8);
2075BTRFS_SETGET_FUNCS(extent_inline_ref_offset, struct btrfs_extent_inline_ref,
2076                   offset, 64);
2077
2078static inline u32 btrfs_extent_inline_ref_size(int type)
2079{
2080        if (type == BTRFS_TREE_BLOCK_REF_KEY ||
2081            type == BTRFS_SHARED_BLOCK_REF_KEY)
2082                return sizeof(struct btrfs_extent_inline_ref);
2083        if (type == BTRFS_SHARED_DATA_REF_KEY)
2084                return sizeof(struct btrfs_shared_data_ref) +
2085                       sizeof(struct btrfs_extent_inline_ref);
2086        if (type == BTRFS_EXTENT_DATA_REF_KEY)
2087                return sizeof(struct btrfs_extent_data_ref) +
2088                       offsetof(struct btrfs_extent_inline_ref, offset);
2089        BUG();
2090        return 0;
2091}
2092
2093BTRFS_SETGET_FUNCS(ref_root_v0, struct btrfs_extent_ref_v0, root, 64);
2094BTRFS_SETGET_FUNCS(ref_generation_v0, struct btrfs_extent_ref_v0,
2095                   generation, 64);
2096BTRFS_SETGET_FUNCS(ref_objectid_v0, struct btrfs_extent_ref_v0, objectid, 64);
2097BTRFS_SETGET_FUNCS(ref_count_v0, struct btrfs_extent_ref_v0, count, 32);
2098
2099/* struct btrfs_node */
2100BTRFS_SETGET_FUNCS(key_blockptr, struct btrfs_key_ptr, blockptr, 64);
2101BTRFS_SETGET_FUNCS(key_generation, struct btrfs_key_ptr, generation, 64);
2102
2103static inline u64 btrfs_node_blockptr(struct extent_buffer *eb, int nr)
2104{
2105        unsigned long ptr;
2106        ptr = offsetof(struct btrfs_node, ptrs) +
2107                sizeof(struct btrfs_key_ptr) * nr;
2108        return btrfs_key_blockptr(eb, (struct btrfs_key_ptr *)ptr);
2109}
2110
2111static inline void btrfs_set_node_blockptr(struct extent_buffer *eb,
2112                                           int nr, u64 val)
2113{
2114        unsigned long ptr;
2115        ptr = offsetof(struct btrfs_node, ptrs) +
2116                sizeof(struct btrfs_key_ptr) * nr;
2117        btrfs_set_key_blockptr(eb, (struct btrfs_key_ptr *)ptr, val);
2118}
2119
2120static inline u64 btrfs_node_ptr_generation(struct extent_buffer *eb, int nr)
2121{
2122        unsigned long ptr;
2123        ptr = offsetof(struct btrfs_node, ptrs) +
2124                sizeof(struct btrfs_key_ptr) * nr;
2125        return btrfs_key_generation(eb, (struct btrfs_key_ptr *)ptr);
2126}
2127
2128static inline void btrfs_set_node_ptr_generation(struct extent_buffer *eb,
2129                                                 int nr, u64 val)
2130{
2131        unsigned long ptr;
2132        ptr = offsetof(struct btrfs_node, ptrs) +
2133                sizeof(struct btrfs_key_ptr) * nr;
2134        btrfs_set_key_generation(eb, (struct btrfs_key_ptr *)ptr, val);
2135}
2136
2137static inline unsigned long btrfs_node_key_ptr_offset(int nr)
2138{
2139        return offsetof(struct btrfs_node, ptrs) +
2140                sizeof(struct btrfs_key_ptr) * nr;
2141}
2142
2143void btrfs_node_key(struct extent_buffer *eb,
2144                    struct btrfs_disk_key *disk_key, int nr);
2145
2146static inline void btrfs_set_node_key(struct extent_buffer *eb,
2147                                      struct btrfs_disk_key *disk_key, int nr)
2148{
2149        unsigned long ptr;
2150        ptr = btrfs_node_key_ptr_offset(nr);
2151        write_eb_member(eb, (struct btrfs_key_ptr *)ptr,
2152                       struct btrfs_key_ptr, key, disk_key);
2153}
2154
2155/* struct btrfs_item */
2156BTRFS_SETGET_FUNCS(item_offset, struct btrfs_item, offset, 32);
2157BTRFS_SETGET_FUNCS(item_size, struct btrfs_item, size, 32);
2158
2159static inline unsigned long btrfs_item_nr_offset(int nr)
2160{
2161        return offsetof(struct btrfs_leaf, items) +
2162                sizeof(struct btrfs_item) * nr;
2163}
2164
2165static inline struct btrfs_item *btrfs_item_nr(struct extent_buffer *eb,
2166                                               int nr)
2167{
2168        return (struct btrfs_item *)btrfs_item_nr_offset(nr);
2169}
2170
2171static inline u32 btrfs_item_end(struct extent_buffer *eb,
2172                                 struct btrfs_item *item)
2173{
2174        return btrfs_item_offset(eb, item) + btrfs_item_size(eb, item);
2175}
2176
2177static inline u32 btrfs_item_end_nr(struct extent_buffer *eb, int nr)
2178{
2179        return btrfs_item_end(eb, btrfs_item_nr(eb, nr));
2180}
2181
2182static inline u32 btrfs_item_offset_nr(struct extent_buffer *eb, int nr)
2183{
2184        return btrfs_item_offset(eb, btrfs_item_nr(eb, nr));
2185}
2186
2187static inline u32 btrfs_item_size_nr(struct extent_buffer *eb, int nr)
2188{
2189        return btrfs_item_size(eb, btrfs_item_nr(eb, nr));
2190}
2191
2192static inline void btrfs_item_key(struct extent_buffer *eb,
2193                           struct btrfs_disk_key *disk_key, int nr)
2194{
2195        struct btrfs_item *item = btrfs_item_nr(eb, nr);
2196        read_eb_member(eb, item, struct btrfs_item, key, disk_key);
2197}
2198
2199static inline void btrfs_set_item_key(struct extent_buffer *eb,
2200                               struct btrfs_disk_key *disk_key, int nr)
2201{
2202        struct btrfs_item *item = btrfs_item_nr(eb, nr);
2203        write_eb_member(eb, item, struct btrfs_item, key, disk_key);
2204}
2205
2206BTRFS_SETGET_FUNCS(dir_log_end, struct btrfs_dir_log_item, end, 64);
2207
2208/*
2209 * struct btrfs_root_ref
2210 */
2211BTRFS_SETGET_FUNCS(root_ref_dirid, struct btrfs_root_ref, dirid, 64);
2212BTRFS_SETGET_FUNCS(root_ref_sequence, struct btrfs_root_ref, sequence, 64);
2213BTRFS_SETGET_FUNCS(root_ref_name_len, struct btrfs_root_ref, name_len, 16);
2214
2215/* struct btrfs_dir_item */
2216BTRFS_SETGET_FUNCS(dir_data_len, struct btrfs_dir_item, data_len, 16);
2217BTRFS_SETGET_FUNCS(dir_type, struct btrfs_dir_item, type, 8);
2218BTRFS_SETGET_FUNCS(dir_name_len, struct btrfs_dir_item, name_len, 16);
2219BTRFS_SETGET_FUNCS(dir_transid, struct btrfs_dir_item, transid, 64);
2220
2221static inline void btrfs_dir_item_key(struct extent_buffer *eb,
2222                                      struct btrfs_dir_item *item,
2223                                      struct btrfs_disk_key *key)
2224{
2225        read_eb_member(eb, item, struct btrfs_dir_item, location, key);
2226}
2227
2228static inline void btrfs_set_dir_item_key(struct extent_buffer *eb,
2229                                          struct btrfs_dir_item *item,
2230                                          struct btrfs_disk_key *key)
2231{
2232        write_eb_member(eb, item, struct btrfs_dir_item, location, key);
2233}
2234
2235BTRFS_SETGET_FUNCS(free_space_entries, struct btrfs_free_space_header,
2236                   num_entries, 64);
2237BTRFS_SETGET_FUNCS(free_space_bitmaps, struct btrfs_free_space_header,
2238                   num_bitmaps, 64);
2239BTRFS_SETGET_FUNCS(free_space_generation, struct btrfs_free_space_header,
2240                   generation, 64);
2241
2242static inline void btrfs_free_space_key(struct extent_buffer *eb,
2243                                        struct btrfs_free_space_header *h,
2244                                        struct btrfs_disk_key *key)
2245{
2246        read_eb_member(eb, h, struct btrfs_free_space_header, location, key);
2247}
2248
2249static inline void btrfs_set_free_space_key(struct extent_buffer *eb,
2250                                            struct btrfs_free_space_header *h,
2251                                            struct btrfs_disk_key *key)
2252{
2253        write_eb_member(eb, h, struct btrfs_free_space_header, location, key);
2254}
2255
2256/* struct btrfs_disk_key */
2257BTRFS_SETGET_STACK_FUNCS(disk_key_objectid, struct btrfs_disk_key,
2258                         objectid, 64);
2259BTRFS_SETGET_STACK_FUNCS(disk_key_offset, struct btrfs_disk_key, offset, 64);
2260BTRFS_SETGET_STACK_FUNCS(disk_key_type, struct btrfs_disk_key, type, 8);
2261
2262static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu,
2263                                         struct btrfs_disk_key *disk)
2264{
2265        cpu->offset = le64_to_cpu(disk->offset);
2266        cpu->type = disk->type;
2267        cpu->objectid = le64_to_cpu(disk->objectid);
2268}
2269
2270static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk,
2271                                         struct btrfs_key *cpu)
2272{
2273        disk->offset = cpu_to_le64(cpu->offset);
2274        disk->type = cpu->type;
2275        disk->objectid = cpu_to_le64(cpu->objectid);
2276}
2277
2278static inline void btrfs_node_key_to_cpu(struct extent_buffer *eb,
2279                                  struct btrfs_key *key, int nr)
2280{
2281        struct btrfs_disk_key disk_key;
2282        btrfs_node_key(eb, &disk_key, nr);
2283        btrfs_disk_key_to_cpu(key, &disk_key);
2284}
2285
2286static inline void btrfs_item_key_to_cpu(struct extent_buffer *eb,
2287                                  struct btrfs_key *key, int nr)
2288{
2289        struct btrfs_disk_key disk_key;
2290        btrfs_item_key(eb, &disk_key, nr);
2291        btrfs_disk_key_to_cpu(key, &disk_key);
2292}
2293
2294static inline void btrfs_dir_item_key_to_cpu(struct extent_buffer *eb,
2295                                      struct btrfs_dir_item *item,
2296                                      struct btrfs_key *key)
2297{
2298        struct btrfs_disk_key disk_key;
2299        btrfs_dir_item_key(eb, item, &disk_key);
2300        btrfs_disk_key_to_cpu(key, &disk_key);
2301}
2302
2303
2304static inline u8 btrfs_key_type(struct btrfs_key *key)
2305{
2306        return key->type;
2307}
2308
2309static inline void btrfs_set_key_type(struct btrfs_key *key, u8 val)
2310{
2311        key->type = val;
2312}
2313
2314/* struct btrfs_header */
2315BTRFS_SETGET_HEADER_FUNCS(header_bytenr, struct btrfs_header, bytenr, 64);
2316BTRFS_SETGET_HEADER_FUNCS(header_generation, struct btrfs_header,
2317                          generation, 64);
2318BTRFS_SETGET_HEADER_FUNCS(header_owner, struct btrfs_header, owner, 64);
2319BTRFS_SETGET_HEADER_FUNCS(header_nritems, struct btrfs_header, nritems, 32);
2320BTRFS_SETGET_HEADER_FUNCS(header_flags, struct btrfs_header, flags, 64);
2321BTRFS_SETGET_HEADER_FUNCS(header_level, struct btrfs_header, level, 8);
2322
2323static inline int btrfs_header_flag(struct extent_buffer *eb, u64 flag)
2324{
2325        return (btrfs_header_flags(eb) & flag) == flag;
2326}
2327
2328static inline int btrfs_set_header_flag(struct extent_buffer *eb, u64 flag)
2329{
2330        u64 flags = btrfs_header_flags(eb);
2331        btrfs_set_header_flags(eb, flags | flag);
2332        return (flags & flag) == flag;
2333}
2334
2335static inline int btrfs_clear_header_flag(struct extent_buffer *eb, u64 flag)
2336{
2337        u64 flags = btrfs_header_flags(eb);
2338        btrfs_set_header_flags(eb, flags & ~flag);
2339        return (flags & flag) == flag;
2340}
2341
2342static inline int btrfs_header_backref_rev(struct extent_buffer *eb)
2343{
2344        u64 flags = btrfs_header_flags(eb);
2345        return flags >> BTRFS_BACKREF_REV_SHIFT;
2346}
2347
2348static inline void btrfs_set_header_backref_rev(struct extent_buffer *eb,
2349                                                int rev)
2350{
2351        u64 flags = btrfs_header_flags(eb);
2352        flags &= ~BTRFS_BACKREF_REV_MASK;
2353        flags |= (u64)rev << BTRFS_BACKREF_REV_SHIFT;
2354        btrfs_set_header_flags(eb, flags);
2355}
2356
2357static inline u8 *btrfs_header_fsid(struct extent_buffer *eb)
2358{
2359        unsigned long ptr = offsetof(struct btrfs_header, fsid);
2360        return (u8 *)ptr;
2361}
2362
2363static inline u8 *btrfs_header_chunk_tree_uuid(struct extent_buffer *eb)
2364{
2365        unsigned long ptr = offsetof(struct btrfs_header, chunk_tree_uuid);
2366        return (u8 *)ptr;
2367}
2368
2369static inline int btrfs_is_leaf(struct extent_buffer *eb)
2370{
2371        return btrfs_header_level(eb) == 0;
2372}
2373
2374/* struct btrfs_root_item */
2375BTRFS_SETGET_FUNCS(disk_root_generation, struct btrfs_root_item,
2376                   generation, 64);
2377BTRFS_SETGET_FUNCS(disk_root_refs, struct btrfs_root_item, refs, 32);
2378BTRFS_SETGET_FUNCS(disk_root_bytenr, struct btrfs_root_item, bytenr, 64);
2379BTRFS_SETGET_FUNCS(disk_root_level, struct btrfs_root_item, level, 8);
2380
2381BTRFS_SETGET_STACK_FUNCS(root_generation, struct btrfs_root_item,
2382                         generation, 64);
2383BTRFS_SETGET_STACK_FUNCS(root_bytenr, struct btrfs_root_item, bytenr, 64);
2384BTRFS_SETGET_STACK_FUNCS(root_level, struct btrfs_root_item, level, 8);
2385BTRFS_SETGET_STACK_FUNCS(root_dirid, struct btrfs_root_item, root_dirid, 64);
2386BTRFS_SETGET_STACK_FUNCS(root_refs, struct btrfs_root_item, refs, 32);
2387BTRFS_SETGET_STACK_FUNCS(root_flags, struct btrfs_root_item, flags, 64);
2388BTRFS_SETGET_STACK_FUNCS(root_used, struct btrfs_root_item, bytes_used, 64);
2389BTRFS_SETGET_STACK_FUNCS(root_limit, struct btrfs_root_item, byte_limit, 64);
2390BTRFS_SETGET_STACK_FUNCS(root_last_snapshot, struct btrfs_root_item,
2391                         last_snapshot, 64);
2392BTRFS_SETGET_STACK_FUNCS(root_generation_v2, struct btrfs_root_item,
2393                         generation_v2, 64);
2394BTRFS_SETGET_STACK_FUNCS(root_ctransid, struct btrfs_root_item,
2395                         ctransid, 64);
2396BTRFS_SETGET_STACK_FUNCS(root_otransid, struct btrfs_root_item,
2397                         otransid, 64);
2398BTRFS_SETGET_STACK_FUNCS(root_stransid, struct btrfs_root_item,
2399                         stransid, 64);
2400BTRFS_SETGET_STACK_FUNCS(root_rtransid, struct btrfs_root_item,
2401                         rtransid, 64);
2402
2403static inline bool btrfs_root_readonly(struct btrfs_root *root)
2404{
2405        return (root->root_item.flags & cpu_to_le64(BTRFS_ROOT_SUBVOL_RDONLY)) != 0;
2406}
2407
2408/* struct btrfs_root_backup */
2409BTRFS_SETGET_STACK_FUNCS(backup_tree_root, struct btrfs_root_backup,
2410                   tree_root, 64);
2411BTRFS_SETGET_STACK_FUNCS(backup_tree_root_gen, struct btrfs_root_backup,
2412                   tree_root_gen, 64);
2413BTRFS_SETGET_STACK_FUNCS(backup_tree_root_level, struct btrfs_root_backup,
2414                   tree_root_level, 8);
2415
2416BTRFS_SETGET_STACK_FUNCS(backup_chunk_root, struct btrfs_root_backup,
2417                   chunk_root, 64);
2418BTRFS_SETGET_STACK_FUNCS(backup_chunk_root_gen, struct btrfs_root_backup,
2419                   chunk_root_gen, 64);
2420BTRFS_SETGET_STACK_FUNCS(backup_chunk_root_level, struct btrfs_root_backup,
2421                   chunk_root_level, 8);
2422
2423BTRFS_SETGET_STACK_FUNCS(backup_extent_root, struct btrfs_root_backup,
2424                   extent_root, 64);
2425BTRFS_SETGET_STACK_FUNCS(backup_extent_root_gen, struct btrfs_root_backup,
2426                   extent_root_gen, 64);
2427BTRFS_SETGET_STACK_FUNCS(backup_extent_root_level, struct btrfs_root_backup,
2428                   extent_root_level, 8);
2429
2430BTRFS_SETGET_STACK_FUNCS(backup_fs_root, struct btrfs_root_backup,
2431                   fs_root, 64);
2432BTRFS_SETGET_STACK_FUNCS(backup_fs_root_gen, struct btrfs_root_backup,
2433                   fs_root_gen, 64);
2434BTRFS_SETGET_STACK_FUNCS(backup_fs_root_level, struct btrfs_root_backup,
2435                   fs_root_level, 8);
2436
2437BTRFS_SETGET_STACK_FUNCS(backup_dev_root, struct btrfs_root_backup,
2438                   dev_root, 64);
2439BTRFS_SETGET_STACK_FUNCS(backup_dev_root_gen, struct btrfs_root_backup,
2440                   dev_root_gen, 64);
2441BTRFS_SETGET_STACK_FUNCS(backup_dev_root_level, struct btrfs_root_backup,
2442                   dev_root_level, 8);
2443
2444BTRFS_SETGET_STACK_FUNCS(backup_csum_root, struct btrfs_root_backup,
2445                   csum_root, 64);
2446BTRFS_SETGET_STACK_FUNCS(backup_csum_root_gen, struct btrfs_root_backup,
2447                   csum_root_gen, 64);
2448BTRFS_SETGET_STACK_FUNCS(backup_csum_root_level, struct btrfs_root_backup,
2449                   csum_root_level, 8);
2450BTRFS_SETGET_STACK_FUNCS(backup_total_bytes, struct btrfs_root_backup,
2451                   total_bytes, 64);
2452BTRFS_SETGET_STACK_FUNCS(backup_bytes_used, struct btrfs_root_backup,
2453                   bytes_used, 64);
2454BTRFS_SETGET_STACK_FUNCS(backup_num_devices, struct btrfs_root_backup,
2455                   num_devices, 64);
2456
2457/* struct btrfs_balance_item */
2458BTRFS_SETGET_FUNCS(balance_flags, struct btrfs_balance_item, flags, 64);
2459
2460static inline void btrfs_balance_data(struct extent_buffer *eb,
2461                                      struct btrfs_balance_item *bi,
2462                                      struct btrfs_disk_balance_args *ba)
2463{
2464        read_eb_member(eb, bi, struct btrfs_balance_item, data, ba);
2465}
2466
2467static inline void btrfs_set_balance_data(struct extent_buffer *eb,
2468                                          struct btrfs_balance_item *bi,
2469                                          struct btrfs_disk_balance_args *ba)
2470{
2471        write_eb_member(eb, bi, struct btrfs_balance_item, data, ba);
2472}
2473
2474static inline void btrfs_balance_meta(struct extent_buffer *eb,
2475                                      struct btrfs_balance_item *bi,
2476                                      struct btrfs_disk_balance_args *ba)
2477{
2478        read_eb_member(eb, bi, struct btrfs_balance_item, meta, ba);
2479}
2480
2481static inline void btrfs_set_balance_meta(struct extent_buffer *eb,
2482                                          struct btrfs_balance_item *bi,
2483                                          struct btrfs_disk_balance_args *ba)
2484{
2485        write_eb_member(eb, bi, struct btrfs_balance_item, meta, ba);
2486}
2487
2488static inline void btrfs_balance_sys(struct extent_buffer *eb,
2489                                     struct btrfs_balance_item *bi,
2490                                     struct btrfs_disk_balance_args *ba)
2491{
2492        read_eb_member(eb, bi, struct btrfs_balance_item, sys, ba);
2493}
2494
2495static inline void btrfs_set_balance_sys(struct extent_buffer *eb,
2496                                         struct btrfs_balance_item *bi,
2497                                         struct btrfs_disk_balance_args *ba)
2498{
2499        write_eb_member(eb, bi, struct btrfs_balance_item, sys, ba);
2500}
2501
2502static inline void
2503btrfs_disk_balance_args_to_cpu(struct btrfs_balance_args *cpu,
2504                               struct btrfs_disk_balance_args *disk)
2505{
2506        memset(cpu, 0, sizeof(*cpu));
2507
2508        cpu->profiles = le64_to_cpu(disk->profiles);
2509        cpu->usage = le64_to_cpu(disk->usage);
2510        cpu->devid = le64_to_cpu(disk->devid);
2511        cpu->pstart = le64_to_cpu(disk->pstart);
2512        cpu->pend = le64_to_cpu(disk->pend);
2513        cpu->vstart = le64_to_cpu(disk->vstart);
2514        cpu->vend = le64_to_cpu(disk->vend);
2515        cpu->target = le64_to_cpu(disk->target);
2516        cpu->flags = le64_to_cpu(disk->flags);
2517}
2518
2519static inline void
2520btrfs_cpu_balance_args_to_disk(struct btrfs_disk_balance_args *disk,
2521                               struct btrfs_balance_args *cpu)
2522{
2523        memset(disk, 0, sizeof(*disk));
2524
2525        disk->profiles = cpu_to_le64(cpu->profiles);
2526        disk->usage = cpu_to_le64(cpu->usage);
2527        disk->devid = cpu_to_le64(cpu->devid);
2528        disk->pstart = cpu_to_le64(cpu->pstart);
2529        disk->pend = cpu_to_le64(cpu->pend);
2530        disk->vstart = cpu_to_le64(cpu->vstart);
2531        disk->vend = cpu_to_le64(cpu->vend);
2532        disk->target = cpu_to_le64(cpu->target);
2533        disk->flags = cpu_to_le64(cpu->flags);
2534}
2535
2536/* struct btrfs_super_block */
2537BTRFS_SETGET_STACK_FUNCS(super_bytenr, struct btrfs_super_block, bytenr, 64);
2538BTRFS_SETGET_STACK_FUNCS(super_flags, struct btrfs_super_block, flags, 64);
2539BTRFS_SETGET_STACK_FUNCS(super_generation, struct btrfs_super_block,
2540                         generation, 64);
2541BTRFS_SETGET_STACK_FUNCS(super_root, struct btrfs_super_block, root, 64);
2542BTRFS_SETGET_STACK_FUNCS(super_sys_array_size,
2543                         struct btrfs_super_block, sys_chunk_array_size, 32);
2544BTRFS_SETGET_STACK_FUNCS(super_chunk_root_generation,
2545                         struct btrfs_super_block, chunk_root_generation, 64);
2546BTRFS_SETGET_STACK_FUNCS(super_root_level, struct btrfs_super_block,
2547                         root_level, 8);
2548BTRFS_SETGET_STACK_FUNCS(super_chunk_root, struct btrfs_super_block,
2549                         chunk_root, 64);
2550BTRFS_SETGET_STACK_FUNCS(super_chunk_root_level, struct btrfs_super_block,
2551                         chunk_root_level, 8);
2552BTRFS_SETGET_STACK_FUNCS(super_log_root, struct btrfs_super_block,
2553                         log_root, 64);
2554BTRFS_SETGET_STACK_FUNCS(super_log_root_transid, struct btrfs_super_block,
2555                         log_root_transid, 64);
2556BTRFS_SETGET_STACK_FUNCS(super_log_root_level, struct btrfs_super_block,
2557                         log_root_level, 8);
2558BTRFS_SETGET_STACK_FUNCS(super_total_bytes, struct btrfs_super_block,
2559                         total_bytes, 64);
2560BTRFS_SETGET_STACK_FUNCS(super_bytes_used, struct btrfs_super_block,
2561                         bytes_used, 64);
2562BTRFS_SETGET_STACK_FUNCS(super_sectorsize, struct btrfs_super_block,
2563                         sectorsize, 32);
2564BTRFS_SETGET_STACK_FUNCS(super_nodesize, struct btrfs_super_block,
2565                         nodesize, 32);
2566BTRFS_SETGET_STACK_FUNCS(super_leafsize, struct btrfs_super_block,
2567                         leafsize, 32);
2568BTRFS_SETGET_STACK_FUNCS(super_stripesize, struct btrfs_super_block,
2569                         stripesize, 32);
2570BTRFS_SETGET_STACK_FUNCS(super_root_dir, struct btrfs_super_block,
2571                         root_dir_objectid, 64);
2572BTRFS_SETGET_STACK_FUNCS(super_num_devices, struct btrfs_super_block,
2573                         num_devices, 64);
2574BTRFS_SETGET_STACK_FUNCS(super_compat_flags, struct btrfs_super_block,
2575                         compat_flags, 64);
2576BTRFS_SETGET_STACK_FUNCS(super_compat_ro_flags, struct btrfs_super_block,
2577                         compat_ro_flags, 64);
2578BTRFS_SETGET_STACK_FUNCS(super_incompat_flags, struct btrfs_super_block,
2579                         incompat_flags, 64);
2580BTRFS_SETGET_STACK_FUNCS(super_csum_type, struct btrfs_super_block,
2581                         csum_type, 16);
2582BTRFS_SETGET_STACK_FUNCS(super_cache_generation, struct btrfs_super_block,
2583                         cache_generation, 64);
2584
2585static inline int btrfs_super_csum_size(struct btrfs_super_block *s)
2586{
2587        int t = btrfs_super_csum_type(s);
2588        BUG_ON(t >= ARRAY_SIZE(btrfs_csum_sizes));
2589        return btrfs_csum_sizes[t];
2590}
2591
2592static inline unsigned long btrfs_leaf_data(struct extent_buffer *l)
2593{
2594        return offsetof(struct btrfs_leaf, items);
2595}
2596
2597/* struct btrfs_file_extent_item */
2598BTRFS_SETGET_FUNCS(file_extent_type, struct btrfs_file_extent_item, type, 8);
2599
2600static inline unsigned long
2601btrfs_file_extent_inline_start(struct btrfs_file_extent_item *e)
2602{
2603        unsigned long offset = (unsigned long)e;
2604        offset += offsetof(struct btrfs_file_extent_item, disk_bytenr);
2605        return offset;
2606}
2607
2608static inline u32 btrfs_file_extent_calc_inline_size(u32 datasize)
2609{
2610        return offsetof(struct btrfs_file_extent_item, disk_bytenr) + datasize;
2611}
2612
2613BTRFS_SETGET_FUNCS(file_extent_disk_bytenr, struct btrfs_file_extent_item,
2614                   disk_bytenr, 64);
2615BTRFS_SETGET_FUNCS(file_extent_generation, struct btrfs_file_extent_item,
2616                   generation, 64);
2617BTRFS_SETGET_FUNCS(file_extent_disk_num_bytes, struct btrfs_file_extent_item,
2618                   disk_num_bytes, 64);
2619BTRFS_SETGET_FUNCS(file_extent_offset, struct btrfs_file_extent_item,
2620                  offset, 64);
2621BTRFS_SETGET_FUNCS(file_extent_num_bytes, struct btrfs_file_extent_item,
2622                   num_bytes, 64);
2623BTRFS_SETGET_FUNCS(file_extent_ram_bytes, struct btrfs_file_extent_item,
2624                   ram_bytes, 64);
2625BTRFS_SETGET_FUNCS(file_extent_compression, struct btrfs_file_extent_item,
2626                   compression, 8);
2627BTRFS_SETGET_FUNCS(file_extent_encryption, struct btrfs_file_extent_item,
2628                   encryption, 8);
2629BTRFS_SETGET_FUNCS(file_extent_other_encoding, struct btrfs_file_extent_item,
2630                   other_encoding, 16);
2631
2632/* this returns the number of file bytes represented by the inline item.
2633 * If an item is compressed, this is the uncompressed size
2634 */
2635static inline u32 btrfs_file_extent_inline_len(struct extent_buffer *eb,
2636                                               struct btrfs_file_extent_item *e)
2637{
2638        return btrfs_file_extent_ram_bytes(eb, e);
2639}
2640
2641/*
2642 * this returns the number of bytes used by the item on disk, minus the
2643 * size of any extent headers.  If a file is compressed on disk, this is
2644 * the compressed size
2645 */
2646static inline u32 btrfs_file_extent_inline_item_len(struct extent_buffer *eb,
2647                                                    struct btrfs_item *e)
2648{
2649        unsigned long offset;
2650        offset = offsetof(struct btrfs_file_extent_item, disk_bytenr);
2651        return btrfs_item_size(eb, e) - offset;
2652}
2653
2654/* btrfs_dev_stats_item */
2655static inline u64 btrfs_dev_stats_value(struct extent_buffer *eb,
2656                                        struct btrfs_dev_stats_item *ptr,
2657                                        int index)
2658{
2659        u64 val;
2660
2661        read_extent_buffer(eb, &val,
2662                           offsetof(struct btrfs_dev_stats_item, values) +
2663                            ((unsigned long)ptr) + (index * sizeof(u64)),
2664                           sizeof(val));
2665        return val;
2666}
2667
2668static inline void btrfs_set_dev_stats_value(struct extent_buffer *eb,
2669                                             struct btrfs_dev_stats_item *ptr,
2670                                             int index, u64 val)
2671{
2672        write_extent_buffer(eb, &val,
2673                            offsetof(struct btrfs_dev_stats_item, values) +
2674                             ((unsigned long)ptr) + (index * sizeof(u64)),
2675                            sizeof(val));
2676}
2677
2678/* btrfs_qgroup_status_item */
2679BTRFS_SETGET_FUNCS(qgroup_status_generation, struct btrfs_qgroup_status_item,
2680                   generation, 64);
2681BTRFS_SETGET_FUNCS(qgroup_status_version, struct btrfs_qgroup_status_item,
2682                   version, 64);
2683BTRFS_SETGET_FUNCS(qgroup_status_flags, struct btrfs_qgroup_status_item,
2684                   flags, 64);
2685BTRFS_SETGET_FUNCS(qgroup_status_scan, struct btrfs_qgroup_status_item,
2686                   scan, 64);
2687
2688/* btrfs_qgroup_info_item */
2689BTRFS_SETGET_FUNCS(qgroup_info_generation, struct btrfs_qgroup_info_item,
2690                   generation, 64);
2691BTRFS_SETGET_FUNCS(qgroup_info_rfer, struct btrfs_qgroup_info_item, rfer, 64);
2692BTRFS_SETGET_FUNCS(qgroup_info_rfer_cmpr, struct btrfs_qgroup_info_item,
2693                   rfer_cmpr, 64);
2694BTRFS_SETGET_FUNCS(qgroup_info_excl, struct btrfs_qgroup_info_item, excl, 64);
2695BTRFS_SETGET_FUNCS(qgroup_info_excl_cmpr, struct btrfs_qgroup_info_item,
2696                   excl_cmpr, 64);
2697
2698BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_generation,
2699                         struct btrfs_qgroup_info_item, generation, 64);
2700BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_rfer, struct btrfs_qgroup_info_item,
2701                         rfer, 64);
2702BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_rfer_cmpr,
2703                         struct btrfs_qgroup_info_item, rfer_cmpr, 64);
2704BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_excl, struct btrfs_qgroup_info_item,
2705                         excl, 64);
2706BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_excl_cmpr,
2707                         struct btrfs_qgroup_info_item, excl_cmpr, 64);
2708
2709/* btrfs_qgroup_limit_item */
2710BTRFS_SETGET_FUNCS(qgroup_limit_flags, struct btrfs_qgroup_limit_item,
2711                   flags, 64);
2712BTRFS_SETGET_FUNCS(qgroup_limit_max_rfer, struct btrfs_qgroup_limit_item,
2713                   max_rfer, 64);
2714BTRFS_SETGET_FUNCS(qgroup_limit_max_excl, struct btrfs_qgroup_limit_item,
2715                   max_excl, 64);
2716BTRFS_SETGET_FUNCS(qgroup_limit_rsv_rfer, struct btrfs_qgroup_limit_item,
2717                   rsv_rfer, 64);
2718BTRFS_SETGET_FUNCS(qgroup_limit_rsv_excl, struct btrfs_qgroup_limit_item,
2719                   rsv_excl, 64);
2720
2721static inline struct btrfs_fs_info *btrfs_sb(struct super_block *sb)
2722{
2723        return sb->s_fs_info;
2724}
2725
2726static inline u32 btrfs_level_size(struct btrfs_root *root, int level)
2727{
2728        if (level == 0)
2729                return root->leafsize;
2730        return root->nodesize;
2731}
2732
2733/* helper function to cast into the data area of the leaf. */
2734#define btrfs_item_ptr(leaf, slot, type) \
2735        ((type *)(btrfs_leaf_data(leaf) + \
2736        btrfs_item_offset_nr(leaf, slot)))
2737
2738#define btrfs_item_ptr_offset(leaf, slot) \
2739        ((unsigned long)(btrfs_leaf_data(leaf) + \
2740        btrfs_item_offset_nr(leaf, slot)))
2741
2742static inline struct dentry *fdentry(struct file *file)
2743{
2744        return file->f_path.dentry;
2745}
2746
2747static inline bool btrfs_mixed_space_info(struct btrfs_space_info *space_info)
2748{
2749        return ((space_info->flags & BTRFS_BLOCK_GROUP_METADATA) &&
2750                (space_info->flags & BTRFS_BLOCK_GROUP_DATA));
2751}
2752
2753static inline gfp_t btrfs_alloc_write_mask(struct address_space *mapping)
2754{
2755        return mapping_gfp_mask(mapping) & ~__GFP_FS;
2756}
2757
2758/* extent-tree.c */
2759static inline u64 btrfs_calc_trans_metadata_size(struct btrfs_root *root,
2760                                                 unsigned num_items)
2761{
2762        return (root->leafsize + root->nodesize * (BTRFS_MAX_LEVEL - 1)) *
2763                3 * num_items;
2764}
2765
2766/*
2767 * Doing a truncate won't result in new nodes or leaves, just what we need for
2768 * COW.
2769 */
2770static inline u64 btrfs_calc_trunc_metadata_size(struct btrfs_root *root,
2771                                                 unsigned num_items)
2772{
2773        return (root->leafsize + root->nodesize * (BTRFS_MAX_LEVEL - 1)) *
2774                num_items;
2775}
2776
2777void btrfs_put_block_group(struct btrfs_block_group_cache *cache);
2778int btrfs_run_delayed_refs(struct btrfs_trans_handle *trans,
2779                           struct btrfs_root *root, unsigned long count);
2780int btrfs_lookup_extent(struct btrfs_root *root, u64 start, u64 len);
2781int btrfs_lookup_extent_info(struct btrfs_trans_handle *trans,
2782                             struct btrfs_root *root, u64 bytenr,
2783                             u64 num_bytes, u64 *refs, u64 *flags);
2784int btrfs_pin_extent(struct btrfs_root *root,
2785                     u64 bytenr, u64 num, int reserved);
2786int btrfs_pin_extent_for_log_replay(struct btrfs_trans_handle *trans,
2787                                    struct btrfs_root *root,
2788                                    u64 bytenr, u64 num_bytes);
2789int btrfs_cross_ref_exist(struct btrfs_trans_handle *trans,
2790                          struct btrfs_root *root,
2791                          u64 objectid, u64 offset, u64 bytenr);
2792struct btrfs_block_group_cache *btrfs_lookup_block_group(
2793                                                 struct btrfs_fs_info *info,
2794                                                 u64 bytenr);
2795void btrfs_put_block_group(struct btrfs_block_group_cache *cache);
2796u64 btrfs_find_block_group(struct btrfs_root *root,
2797                           u64 search_start, u64 search_hint, int owner);
2798struct extent_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
2799                                        struct btrfs_root *root, u32 blocksize,
2800                                        u64 parent, u64 root_objectid,
2801                                        struct btrfs_disk_key *key, int level,
2802                                        u64 hint, u64 empty_size);
2803void btrfs_free_tree_block(struct btrfs_trans_handle *trans,
2804                           struct btrfs_root *root,
2805                           struct extent_buffer *buf,
2806                           u64 parent, int last_ref);
2807struct extent_buffer *btrfs_init_new_buffer(struct btrfs_trans_handle *trans,
2808                                            struct btrfs_root *root,
2809                                            u64 bytenr, u32 blocksize,
2810                                            int level);
2811int btrfs_alloc_reserved_file_extent(struct btrfs_trans_handle *trans,
2812                                     struct btrfs_root *root,
2813                                     u64 root_objectid, u64 owner,
2814                                     u64 offset, struct btrfs_key *ins);
2815int btrfs_alloc_logged_file_extent(struct btrfs_trans_handle *trans,
2816                                   struct btrfs_root *root,
2817                                   u64 root_objectid, u64 owner, u64 offset,
2818                                   struct btrfs_key *ins);
2819int btrfs_reserve_extent(struct btrfs_trans_handle *trans,
2820                                  struct btrfs_root *root,
2821                                  u64 num_bytes, u64 min_alloc_size,
2822                                  u64 empty_size, u64 hint_byte,
2823                                  struct btrfs_key *ins, u64 data);
2824int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2825                  struct extent_buffer *buf, int full_backref, int for_cow);
2826int btrfs_dec_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2827                  struct extent_buffer *buf, int full_backref, int for_cow);
2828int btrfs_set_disk_extent_flags(struct btrfs_trans_handle *trans,
2829                                struct btrfs_root *root,
2830                                u64 bytenr, u64 num_bytes, u64 flags,
2831                                int is_data);
2832int btrfs_free_extent(struct btrfs_trans_handle *trans,
2833                      struct btrfs_root *root,
2834                      u64 bytenr, u64 num_bytes, u64 parent, u64 root_objectid,
2835                      u64 owner, u64 offset, int for_cow);
2836
2837int btrfs_free_reserved_extent(struct btrfs_root *root, u64 start, u64 len);
2838int btrfs_free_and_pin_reserved_extent(struct btrfs_root *root,
2839                                       u64 start, u64 len);
2840void btrfs_prepare_extent_commit(struct btrfs_trans_handle *trans,
2841                                 struct btrfs_root *root);
2842int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans,
2843                               struct btrfs_root *root);
2844int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
2845                         struct btrfs_root *root,
2846                         u64 bytenr, u64 num_bytes, u64 parent,
2847                         u64 root_objectid, u64 owner, u64 offset, int for_cow);
2848
2849int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans,
2850                                    struct btrfs_root *root);
2851int btrfs_extent_readonly(struct btrfs_root *root, u64 bytenr);
2852int btrfs_free_block_groups(struct btrfs_fs_info *info);
2853int btrfs_read_block_groups(struct btrfs_root *root);
2854int btrfs_can_relocate(struct btrfs_root *root, u64 bytenr);
2855int btrfs_make_block_group(struct btrfs_trans_handle *trans,
2856                           struct btrfs_root *root, u64 bytes_used,
2857                           u64 type, u64 chunk_objectid, u64 chunk_offset,
2858                           u64 size);
2859int btrfs_remove_block_group(struct btrfs_trans_handle *trans,
2860                             struct btrfs_root *root, u64 group_start);
2861u64 btrfs_reduce_alloc_profile(struct btrfs_root *root, u64 flags);
2862u64 btrfs_get_alloc_profile(struct btrfs_root *root, int data);
2863void btrfs_clear_space_info_full(struct btrfs_fs_info *info);
2864int btrfs_check_data_free_space(struct inode *inode, u64 bytes);
2865void btrfs_free_reserved_data_space(struct inode *inode, u64 bytes);
2866void btrfs_trans_release_metadata(struct btrfs_trans_handle *trans,
2867                                struct btrfs_root *root);
2868int btrfs_orphan_reserve_metadata(struct btrfs_trans_handle *trans,
2869                                  struct inode *inode);
2870void btrfs_orphan_release_metadata(struct inode *inode);
2871int btrfs_snap_reserve_metadata(struct btrfs_trans_handle *trans,
2872                                struct btrfs_pending_snapshot *pending);
2873int btrfs_delalloc_reserve_metadata(struct inode *inode, u64 num_bytes);
2874void btrfs_delalloc_release_metadata(struct inode *inode, u64 num_bytes);
2875int btrfs_delalloc_reserve_space(struct inode *inode, u64 num_bytes);
2876void btrfs_delalloc_release_space(struct inode *inode, u64 num_bytes);
2877void btrfs_init_block_rsv(struct btrfs_block_rsv *rsv);
2878struct btrfs_block_rsv *btrfs_alloc_block_rsv(struct btrfs_root *root);
2879void btrfs_free_block_rsv(struct btrfs_root *root,
2880                          struct btrfs_block_rsv *rsv);
2881int btrfs_block_rsv_add(struct btrfs_root *root,
2882                        struct btrfs_block_rsv *block_rsv,
2883                        u64 num_bytes);
2884int btrfs_block_rsv_add_noflush(struct btrfs_root *root,
2885                                struct btrfs_block_rsv *block_rsv,
2886                                u64 num_bytes);
2887int btrfs_block_rsv_check(struct btrfs_root *root,
2888                          struct btrfs_block_rsv *block_rsv, int min_factor);
2889int btrfs_block_rsv_refill(struct btrfs_root *root,
2890                          struct btrfs_block_rsv *block_rsv,
2891                          u64 min_reserved);
2892int btrfs_block_rsv_refill_noflush(struct btrfs_root *root,
2893                                   struct btrfs_block_rsv *block_rsv,
2894                                   u64 min_reserved);
2895int btrfs_block_rsv_migrate(struct btrfs_block_rsv *src_rsv,
2896                            struct btrfs_block_rsv *dst_rsv,
2897                            u64 num_bytes);
2898void btrfs_block_rsv_release(struct btrfs_root *root,
2899                             struct btrfs_block_rsv *block_rsv,
2900                             u64 num_bytes);
2901int btrfs_set_block_group_ro(struct btrfs_root *root,
2902                             struct btrfs_block_group_cache *cache);
2903void btrfs_set_block_group_rw(struct btrfs_root *root,
2904                              struct btrfs_block_group_cache *cache);
2905void btrfs_put_block_group_cache(struct btrfs_fs_info *info);
2906u64 btrfs_account_ro_block_groups_free_space(struct btrfs_space_info *sinfo);
2907int btrfs_error_unpin_extent_range(struct btrfs_root *root,
2908                                   u64 start, u64 end);
2909int btrfs_error_discard_extent(struct btrfs_root *root, u64 bytenr,
2910                               u64 num_bytes, u64 *actual_bytes);
2911int btrfs_force_chunk_alloc(struct btrfs_trans_handle *trans,
2912                            struct btrfs_root *root, u64 type);
2913int btrfs_trim_fs(struct btrfs_root *root, struct fstrim_range *range);
2914
2915int btrfs_init_space_info(struct btrfs_fs_info *fs_info);
2916int btrfs_delayed_refs_qgroup_accounting(struct btrfs_trans_handle *trans,
2917                                         struct btrfs_fs_info *fs_info);
2918/* ctree.c */
2919int btrfs_bin_search(struct extent_buffer *eb, struct btrfs_key *key,
2920                     int level, int *slot);
2921int btrfs_comp_cpu_keys(struct btrfs_key *k1, struct btrfs_key *k2);
2922int btrfs_previous_item(struct btrfs_root *root,
2923                        struct btrfs_path *path, u64 min_objectid,
2924                        int type);
2925void btrfs_set_item_key_safe(struct btrfs_trans_handle *trans,
2926                             struct btrfs_root *root, struct btrfs_path *path,
2927                             struct btrfs_key *new_key);
2928struct extent_buffer *btrfs_root_node(struct btrfs_root *root);
2929struct extent_buffer *btrfs_lock_root_node(struct btrfs_root *root);
2930int btrfs_find_next_key(struct btrfs_root *root, struct btrfs_path *path,
2931                        struct btrfs_key *key, int lowest_level,
2932                        int cache_only, u64 min_trans);
2933int btrfs_search_forward(struct btrfs_root *root, struct btrfs_key *min_key,
2934                         struct btrfs_key *max_key,
2935                         struct btrfs_path *path, int cache_only,
2936                         u64 min_trans);
2937enum btrfs_compare_tree_result {
2938        BTRFS_COMPARE_TREE_NEW,
2939        BTRFS_COMPARE_TREE_DELETED,
2940        BTRFS_COMPARE_TREE_CHANGED,
2941};
2942typedef int (*btrfs_changed_cb_t)(struct btrfs_root *left_root,
2943                                  struct btrfs_root *right_root,
2944                                  struct btrfs_path *left_path,
2945                                  struct btrfs_path *right_path,
2946                                  struct btrfs_key *key,
2947                                  enum btrfs_compare_tree_result result,
2948                                  void *ctx);
2949int btrfs_compare_trees(struct btrfs_root *left_root,
2950                        struct btrfs_root *right_root,
2951                        btrfs_changed_cb_t cb, void *ctx);
2952int btrfs_cow_block(struct btrfs_trans_handle *trans,
2953                    struct btrfs_root *root, struct extent_buffer *buf,
2954                    struct extent_buffer *parent, int parent_slot,
2955                    struct extent_buffer **cow_ret);
2956int btrfs_copy_root(struct btrfs_trans_handle *trans,
2957                      struct btrfs_root *root,
2958                      struct extent_buffer *buf,
2959                      struct extent_buffer **cow_ret, u64 new_root_objectid);
2960int btrfs_block_can_be_shared(struct btrfs_root *root,
2961                              struct extent_buffer *buf);
2962void btrfs_extend_item(struct btrfs_trans_handle *trans,
2963                       struct btrfs_root *root, struct btrfs_path *path,
2964                       u32 data_size);
2965void btrfs_truncate_item(struct btrfs_trans_handle *trans,
2966                         struct btrfs_root *root,
2967                         struct btrfs_path *path,
2968                         u32 new_size, int from_end);
2969int btrfs_split_item(struct btrfs_trans_handle *trans,
2970                     struct btrfs_root *root,
2971                     struct btrfs_path *path,
2972                     struct btrfs_key *new_key,
2973                     unsigned long split_offset);
2974int btrfs_duplicate_item(struct btrfs_trans_handle *trans,
2975                         struct btrfs_root *root,
2976                         struct btrfs_path *path,
2977                         struct btrfs_key *new_key);
2978int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root
2979                      *root, struct btrfs_key *key, struct btrfs_path *p, int
2980                      ins_len, int cow);
2981int btrfs_search_old_slot(struct btrfs_root *root, struct btrfs_key *key,
2982                          struct btrfs_path *p, u64 time_seq);
2983int btrfs_search_slot_for_read(struct btrfs_root *root,
2984                               struct btrfs_key *key, struct btrfs_path *p,
2985                               int find_higher, int return_any);
2986int btrfs_realloc_node(struct btrfs_trans_handle *trans,
2987                       struct btrfs_root *root, struct extent_buffer *parent,
2988                       int start_slot, int cache_only, u64 *last_ret,
2989                       struct btrfs_key *progress);
2990void btrfs_release_path(struct btrfs_path *p);
2991struct btrfs_path *btrfs_alloc_path(void);
2992void btrfs_free_path(struct btrfs_path *p);
2993void btrfs_set_path_blocking(struct btrfs_path *p);
2994void btrfs_clear_path_blocking(struct btrfs_path *p,
2995                               struct extent_buffer *held, int held_rw);
2996void btrfs_unlock_up_safe(struct btrfs_path *p, int level);
2997
2998int btrfs_del_items(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2999                   struct btrfs_path *path, int slot, int nr);
3000static inline int btrfs_del_item(struct btrfs_trans_handle *trans,
3001                                 struct btrfs_root *root,
3002                                 struct btrfs_path *path)
3003{
3004        return btrfs_del_items(trans, root, path, path->slots[0], 1);
3005}
3006
3007void setup_items_for_insert(struct btrfs_trans_handle *trans,
3008                            struct btrfs_root *root, struct btrfs_path *path,
3009                            struct btrfs_key *cpu_key, u32 *data_size,
3010                            u32 total_data, u32 total_size, int nr);
3011int btrfs_insert_item(struct btrfs_trans_handle *trans, struct btrfs_root
3012                      *root, struct btrfs_key *key, void *data, u32 data_size);
3013int btrfs_insert_empty_items(struct btrfs_trans_handle *trans,
3014                             struct btrfs_root *root,
3015                             struct btrfs_path *path,
3016                             struct btrfs_key *cpu_key, u32 *data_size, int nr);
3017
3018static inline int btrfs_insert_empty_item(struct btrfs_trans_handle *trans,
3019                                          struct btrfs_root *root,
3020                                          struct btrfs_path *path,
3021                                          struct btrfs_key *key,
3022                                          u32 data_size)
3023{
3024        return btrfs_insert_empty_items(trans, root, path, key, &data_size, 1);
3025}
3026
3027int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path);
3028int btrfs_next_old_leaf(struct btrfs_root *root, struct btrfs_path *path,
3029                        u64 time_seq);
3030static inline int btrfs_next_old_item(struct btrfs_root *root,
3031                                      struct btrfs_path *p, u64 time_seq)
3032{
3033        ++p->slots[0];
3034        if (p->slots[0] >= btrfs_header_nritems(p->nodes[0]))
3035                return btrfs_next_old_leaf(root, p, time_seq);
3036        return 0;
3037}
3038static inline int btrfs_next_item(struct btrfs_root *root, struct btrfs_path *p)
3039{
3040        return btrfs_next_old_item(root, p, 0);
3041}
3042int btrfs_prev_leaf(struct btrfs_root *root, struct btrfs_path *path);
3043int btrfs_leaf_free_space(struct btrfs_root *root, struct extent_buffer *leaf);
3044int __must_check btrfs_drop_snapshot(struct btrfs_root *root,
3045                                     struct btrfs_block_rsv *block_rsv,
3046                                     int update_ref, int for_reloc);
3047int btrfs_drop_subtree(struct btrfs_trans_handle *trans,
3048                        struct btrfs_root *root,
3049                        struct extent_buffer *node,
3050                        struct extent_buffer *parent);
3051static inline int btrfs_fs_closing(struct btrfs_fs_info *fs_info)
3052{
3053        /*
3054         * Get synced with close_ctree()
3055         */
3056        smp_mb();
3057        return fs_info->closing;
3058}
3059static inline void free_fs_info(struct btrfs_fs_info *fs_info)
3060{
3061        kfree(fs_info->balance_ctl);
3062        kfree(fs_info->delayed_root);
3063        kfree(fs_info->extent_root);
3064        kfree(fs_info->tree_root);
3065        kfree(fs_info->chunk_root);
3066        kfree(fs_info->dev_root);
3067        kfree(fs_info->csum_root);
3068        kfree(fs_info->quota_root);
3069        kfree(fs_info->super_copy);
3070        kfree(fs_info->super_for_commit);
3071        kfree(fs_info);
3072}
3073
3074/* tree mod log functions from ctree.c */
3075u64 btrfs_get_tree_mod_seq(struct btrfs_fs_info *fs_info,
3076                           struct seq_list *elem);
3077void btrfs_put_tree_mod_seq(struct btrfs_fs_info *fs_info,
3078                            struct seq_list *elem);
3079static inline u64 btrfs_inc_tree_mod_seq(struct btrfs_fs_info *fs_info)
3080{
3081        return atomic_inc_return(&fs_info->tree_mod_seq);
3082}
3083
3084/* root-item.c */
3085int btrfs_find_root_ref(struct btrfs_root *tree_root,
3086                        struct btrfs_path *path,
3087                        u64 root_id, u64 ref_id);
3088int btrfs_add_root_ref(struct btrfs_trans_handle *trans,
3089                       struct btrfs_root *tree_root,
3090                       u64 root_id, u64 ref_id, u64 dirid, u64 sequence,
3091                       const char *name, int name_len);
3092int btrfs_del_root_ref(struct btrfs_trans_handle *trans,
3093                       struct btrfs_root *tree_root,
3094                       u64 root_id, u64 ref_id, u64 dirid, u64 *sequence,
3095                       const char *name, int name_len);
3096int btrfs_del_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
3097                   struct btrfs_key *key);
3098int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root
3099                      *root, struct btrfs_key *key, struct btrfs_root_item
3100                      *item);
3101int __must_check btrfs_update_root(struct btrfs_trans_handle *trans,
3102                                   struct btrfs_root *root,
3103                                   struct btrfs_key *key,
3104                                   struct btrfs_root_item *item);
3105void btrfs_read_root_item(struct btrfs_root *root,
3106                         struct extent_buffer *eb, int slot,
3107                         struct btrfs_root_item *item);
3108int btrfs_find_last_root(struct btrfs_root *root, u64 objectid, struct
3109                         btrfs_root_item *item, struct btrfs_key *key);
3110int btrfs_find_dead_roots(struct btrfs_root *root, u64 objectid);
3111int btrfs_find_orphan_roots(struct btrfs_root *tree_root);
3112void btrfs_set_root_node(struct btrfs_root_item *item,
3113                         struct extent_buffer *node);
3114void btrfs_check_and_init_root_item(struct btrfs_root_item *item);
3115void btrfs_update_root_times(struct btrfs_trans_handle *trans,
3116                             struct btrfs_root *root);
3117
3118/* dir-item.c */
3119int btrfs_insert_dir_item(struct btrfs_trans_handle *trans,
3120                          struct btrfs_root *root, const char *name,
3121                          int name_len, struct inode *dir,
3122                          struct btrfs_key *location, u8 type, u64 index);
3123struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans,
3124                                             struct btrfs_root *root,
3125                                             struct btrfs_path *path, u64 dir,
3126                                             const char *name, int name_len,
3127                                             int mod);
3128struct btrfs_dir_item *
3129btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans,
3130                            struct btrfs_root *root,
3131                            struct btrfs_path *path, u64 dir,
3132                            u64 objectid, const char *name, int name_len,
3133                            int mod);
3134struct btrfs_dir_item *
3135btrfs_search_dir_index_item(struct btrfs_root *root,
3136                            struct btrfs_path *path, u64 dirid,
3137                            const char *name, int name_len);
3138struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_root *root,
3139                              struct btrfs_path *path,
3140                              const char *name, int name_len);
3141int btrfs_delete_one_dir_name(struct btrfs_trans_handle *trans,
3142                              struct btrfs_root *root,
3143                              struct btrfs_path *path,
3144                              struct btrfs_dir_item *di);
3145int btrfs_insert_xattr_item(struct btrfs_trans_handle *trans,
3146                            struct btrfs_root *root,
3147                            struct btrfs_path *path, u64 objectid,
3148                            const char *name, u16 name_len,
3149                            const void *data, u16 data_len);
3150struct btrfs_dir_item *btrfs_lookup_xattr(struct btrfs_trans_handle *trans,
3151                                          struct btrfs_root *root,
3152                                          struct btrfs_path *path, u64 dir,
3153                                          const char *name, u16 name_len,
3154                                          int mod);
3155int verify_dir_item(struct btrfs_root *root,
3156                    struct extent_buffer *leaf,
3157                    struct btrfs_dir_item *dir_item);
3158
3159/* orphan.c */
3160int btrfs_insert_orphan_item(struct btrfs_trans_handle *trans,
3161                             struct btrfs_root *root, u64 offset);
3162int btrfs_del_orphan_item(struct btrfs_trans_handle *trans,
3163                          struct btrfs_root *root, u64 offset);
3164int btrfs_find_orphan_item(struct btrfs_root *root, u64 offset);
3165
3166/* inode-item.c */
3167int btrfs_insert_inode_ref(struct btrfs_trans_handle *trans,
3168                           struct btrfs_root *root,
3169                           const char *name, int name_len,
3170                           u64 inode_objectid, u64 ref_objectid, u64 index);
3171int btrfs_del_inode_ref(struct btrfs_trans_handle *trans,
3172                           struct btrfs_root *root,
3173                           const char *name, int name_len,
3174                           u64 inode_objectid, u64 ref_objectid, u64 *index);
3175struct btrfs_inode_ref *
3176btrfs_lookup_inode_ref(struct btrfs_trans_handle *trans,
3177                        struct btrfs_root *root,
3178                        struct btrfs_path *path,
3179                        const char *name, int name_len,
3180                        u64 inode_objectid, u64 ref_objectid, int mod);
3181int btrfs_insert_empty_inode(struct btrfs_trans_handle *trans,
3182                             struct btrfs_root *root,
3183                             struct btrfs_path *path, u64 objectid);
3184int btrfs_lookup_inode(struct btrfs_trans_handle *trans, struct btrfs_root
3185                       *root, struct btrfs_path *path,
3186                       struct btrfs_key *location, int mod);
3187
3188/* file-item.c */
3189int btrfs_del_csums(struct btrfs_trans_handle *trans,
3190                    struct btrfs_root *root, u64 bytenr, u64 len);
3191int btrfs_lookup_bio_sums(struct btrfs_root *root, struct inode *inode,
3192                          struct bio *bio, u32 *dst);
3193int btrfs_lookup_bio_sums_dio(struct btrfs_root *root, struct inode *inode,
3194                              struct bio *bio, u64 logical_offset);
3195int btrfs_insert_file_extent(struct btrfs_trans_handle *trans,
3196                             struct btrfs_root *root,
3197                             u64 objectid, u64 pos,
3198                             u64 disk_offset, u64 disk_num_bytes,
3199                             u64 num_bytes, u64 offset, u64 ram_bytes,
3200                             u8 compression, u8 encryption, u16 other_encoding);
3201int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
3202                             struct btrfs_root *root,
3203                             struct btrfs_path *path, u64 objectid,
3204                             u64 bytenr, int mod);
3205int btrfs_csum_file_blocks(struct btrfs_trans_handle *trans,
3206                           struct btrfs_root *root,
3207                           struct btrfs_ordered_sum *sums);
3208int btrfs_csum_one_bio(struct btrfs_root *root, struct inode *inode,
3209                       struct bio *bio, u64 file_start, int contig);
3210struct btrfs_csum_item *btrfs_lookup_csum(struct btrfs_trans_handle *trans,
3211                                          struct btrfs_root *root,
3212                                          struct btrfs_path *path,
3213                                          u64 bytenr, int cow);
3214int btrfs_csum_truncate(struct btrfs_trans_handle *trans,
3215                        struct btrfs_root *root, struct btrfs_path *path,
3216                        u64 isize);
3217int btrfs_lookup_csums_range(struct btrfs_root *root, u64 start, u64 end,
3218                             struct list_head *list, int search_commit);
3219/* inode.c */
3220struct extent_map *btrfs_get_extent_fiemap(struct inode *inode, struct page *page,
3221                                           size_t pg_offset, u64 start, u64 len,
3222                                           int create);
3223
3224/* RHEL and EL kernels have a patch that renames PG_checked to FsMisc */
3225#if defined(ClearPageFsMisc) && !defined(ClearPageChecked)
3226#define ClearPageChecked ClearPageFsMisc
3227#define SetPageChecked SetPageFsMisc
3228#define PageChecked PageFsMisc
3229#endif
3230
3231/* This forces readahead on a given range of bytes in an inode */
3232static inline void btrfs_force_ra(struct address_space *mapping,
3233                                  struct file_ra_state *ra, struct file *file,
3234                                  pgoff_t offset, unsigned long req_size)
3235{
3236        page_cache_sync_readahead(mapping, ra, file, offset, req_size);
3237}
3238
3239struct inode *btrfs_lookup_dentry(struct inode *dir, struct dentry *dentry);
3240int btrfs_set_inode_index(struct inode *dir, u64 *index);
3241int btrfs_unlink_inode(struct btrfs_trans_handle *trans,
3242                       struct btrfs_root *root,
3243                       struct inode *dir, struct inode *inode,
3244                       const char *name, int name_len);
3245int btrfs_add_link(struct btrfs_trans_handle *trans,
3246                   struct inode *parent_inode, struct inode *inode,
3247                   const char *name, int name_len, int add_backref, u64 index);
3248int btrfs_unlink_subvol(struct btrfs_trans_handle *trans,
3249                        struct btrfs_root *root,
3250                        struct inode *dir, u64 objectid,
3251                        const char *name, int name_len);
3252int btrfs_truncate_inode_items(struct btrfs_trans_handle *trans,
3253                               struct btrfs_root *root,
3254                               struct inode *inode, u64 new_size,
3255                               u32 min_type);
3256
3257int btrfs_start_delalloc_inodes(struct btrfs_root *root, int delay_iput);
3258int btrfs_set_extent_delalloc(struct inode *inode, u64 start, u64 end,
3259                              struct extent_state **cached_state);
3260int btrfs_writepages(struct address_space *mapping,
3261                     struct writeback_control *wbc);
3262int btrfs_create_subvol_root(struct btrfs_trans_handle *trans,
3263                             struct btrfs_root *new_root, u64 new_dirid);
3264int btrfs_merge_bio_hook(struct page *page, unsigned long offset,
3265                         size_t size, struct bio *bio, unsigned long bio_flags);
3266
3267int btrfs_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf);
3268int btrfs_readpage(struct file *file, struct page *page);
3269void btrfs_evict_inode(struct inode *inode);
3270int btrfs_write_inode(struct inode *inode, struct writeback_control *wbc);
3271int btrfs_dirty_inode(struct inode *inode);
3272struct inode *btrfs_alloc_inode(struct super_block *sb);
3273void btrfs_destroy_inode(struct inode *inode);
3274int btrfs_drop_inode(struct inode *inode);
3275int btrfs_init_cachep(void);
3276void btrfs_destroy_cachep(void);
3277long btrfs_ioctl_trans_end(struct file *file);
3278struct inode *btrfs_iget(struct super_block *s, struct btrfs_key *location,
3279                         struct btrfs_root *root, int *was_new);
3280struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page,
3281                                    size_t pg_offset, u64 start, u64 end,
3282                                    int create);
3283int btrfs_update_inode(struct btrfs_trans_handle *trans,
3284                              struct btrfs_root *root,
3285                              struct inode *inode);
3286int btrfs_orphan_add(struct btrfs_trans_handle *trans, struct inode *inode);
3287int btrfs_orphan_del(struct btrfs_trans_handle *trans, struct inode *inode);
3288int btrfs_orphan_cleanup(struct btrfs_root *root);
3289void btrfs_orphan_commit_root(struct btrfs_trans_handle *trans,
3290                              struct btrfs_root *root);
3291int btrfs_cont_expand(struct inode *inode, loff_t oldsize, loff_t size);
3292void btrfs_invalidate_inodes(struct btrfs_root *root);
3293void btrfs_add_delayed_iput(struct inode *inode);
3294void btrfs_run_delayed_iputs(struct btrfs_root *root);
3295int btrfs_prealloc_file_range(struct inode *inode, int mode,
3296                              u64 start, u64 num_bytes, u64 min_size,
3297                              loff_t actual_len, u64 *alloc_hint);
3298int btrfs_prealloc_file_range_trans(struct inode *inode,
3299                                    struct btrfs_trans_handle *trans, int mode,
3300                                    u64 start, u64 num_bytes, u64 min_size,
3301                                    loff_t actual_len, u64 *alloc_hint);
3302extern const struct dentry_operations btrfs_dentry_operations;
3303
3304/* ioctl.c */
3305long btrfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
3306void btrfs_update_iflags(struct inode *inode);
3307void btrfs_inherit_iflags(struct inode *inode, struct inode *dir);
3308int btrfs_defrag_file(struct inode *inode, struct file *file,
3309                      struct btrfs_ioctl_defrag_range_args *range,
3310                      u64 newer_than, unsigned long max_pages);
3311/* file.c */
3312int btrfs_add_inode_defrag(struct btrfs_trans_handle *trans,
3313                           struct inode *inode);
3314int btrfs_run_defrag_inodes(struct btrfs_fs_info *fs_info);
3315int btrfs_sync_file(struct file *file, loff_t start, loff_t end, int datasync);
3316int btrfs_drop_extent_cache(struct inode *inode, u64 start, u64 end,
3317                            int skip_pinned);
3318extern const struct file_operations btrfs_file_operations;
3319int btrfs_drop_extents(struct btrfs_trans_handle *trans, struct inode *inode,
3320                       u64 start, u64 end, u64 *hint_byte, int drop_cache);
3321int btrfs_mark_extent_written(struct btrfs_trans_handle *trans,
3322                              struct inode *inode, u64 start, u64 end);
3323int btrfs_release_file(struct inode *inode, struct file *file);
3324void btrfs_drop_pages(struct page **pages, size_t num_pages);
3325int btrfs_dirty_pages(struct btrfs_root *root, struct inode *inode,
3326                      struct page **pages, size_t num_pages,
3327                      loff_t pos, size_t write_bytes,
3328                      struct extent_state **cached);
3329
3330/* tree-defrag.c */
3331int btrfs_defrag_leaves(struct btrfs_trans_handle *trans,
3332                        struct btrfs_root *root, int cache_only);
3333
3334/* sysfs.c */
3335int btrfs_init_sysfs(void);
3336void btrfs_exit_sysfs(void);
3337
3338/* xattr.c */
3339ssize_t btrfs_listxattr(struct dentry *dentry, char *buffer, size_t size);
3340
3341/* super.c */
3342int btrfs_parse_options(struct btrfs_root *root, char *options);
3343int btrfs_sync_fs(struct super_block *sb, int wait);
3344
3345#ifdef CONFIG_PRINTK
3346__printf(2, 3)
3347void btrfs_printk(struct btrfs_fs_info *fs_info, const char *fmt, ...);
3348#else
3349static inline __printf(2, 3)
3350void btrfs_printk(struct btrfs_fs_info *fs_info, const char *fmt, ...)
3351{
3352}
3353#endif
3354
3355__printf(5, 6)
3356void __btrfs_std_error(struct btrfs_fs_info *fs_info, const char *function,
3357                     unsigned int line, int errno, const char *fmt, ...);
3358
3359
3360void __btrfs_abort_transaction(struct btrfs_trans_handle *trans,
3361                               struct btrfs_root *root, const char *function,
3362                               unsigned int line, int errno);
3363
3364#define btrfs_set_fs_incompat(__fs_info, opt) \
3365        __btrfs_set_fs_incompat((__fs_info), BTRFS_FEATURE_INCOMPAT_##opt)
3366
3367static inline void __btrfs_set_fs_incompat(struct btrfs_fs_info *fs_info,
3368                                           u64 flag)
3369{
3370        struct btrfs_super_block *disk_super;
3371        u64 features;
3372
3373        disk_super = fs_info->super_copy;
3374        features = btrfs_super_incompat_flags(disk_super);
3375        if (!(features & flag)) {
3376                features |= flag;
3377                btrfs_set_super_incompat_flags(disk_super, features);
3378        }
3379}
3380
3381#define btrfs_abort_transaction(trans, root, errno)             \
3382do {                                                            \
3383        __btrfs_abort_transaction(trans, root, __func__,        \
3384                                  __LINE__, errno);             \
3385} while (0)
3386
3387#define btrfs_std_error(fs_info, errno)                         \
3388do {                                                            \
3389        if ((errno))                                            \
3390                __btrfs_std_error((fs_info), __func__,          \
3391                                   __LINE__, (errno), NULL);    \
3392} while (0)
3393
3394#define btrfs_error(fs_info, errno, fmt, args...)               \
3395do {                                                            \
3396        __btrfs_std_error((fs_info), __func__, __LINE__,        \
3397                          (errno), fmt, ##args);                \
3398} while (0)
3399
3400__printf(5, 6)
3401void __btrfs_panic(struct btrfs_fs_info *fs_info, const char *function,
3402                   unsigned int line, int errno, const char *fmt, ...);
3403
3404#define btrfs_panic(fs_info, errno, fmt, args...)                       \
3405do {                                                                    \
3406        struct btrfs_fs_info *_i = (fs_info);                           \
3407        __btrfs_panic(_i, __func__, __LINE__, errno, fmt, ##args);      \
3408        BUG_ON(!(_i->mount_opt & BTRFS_MOUNT_PANIC_ON_FATAL_ERROR));    \
3409} while (0)
3410
3411/* acl.c */
3412#ifdef CONFIG_BTRFS_FS_POSIX_ACL
3413struct posix_acl *btrfs_get_acl(struct inode *inode, int type);
3414int btrfs_init_acl(struct btrfs_trans_handle *trans,
3415                   struct inode *inode, struct inode *dir);
3416int btrfs_acl_chmod(struct inode *inode);
3417#else
3418#define btrfs_get_acl NULL
3419static inline int btrfs_init_acl(struct btrfs_trans_handle *trans,
3420                                 struct inode *inode, struct inode *dir)
3421{
3422        return 0;
3423}
3424static inline int btrfs_acl_chmod(struct inode *inode)
3425{
3426        return 0;
3427}
3428#endif
3429
3430/* relocation.c */
3431int btrfs_relocate_block_group(struct btrfs_root *root, u64 group_start);
3432int btrfs_init_reloc_root(struct btrfs_trans_handle *trans,
3433                          struct btrfs_root *root);
3434int btrfs_update_reloc_root(struct btrfs_trans_handle *trans,
3435                            struct btrfs_root *root);
3436int btrfs_recover_relocation(struct btrfs_root *root);
3437int btrfs_reloc_clone_csums(struct inode *inode, u64 file_pos, u64 len);
3438void btrfs_reloc_cow_block(struct btrfs_trans_handle *trans,
3439                           struct btrfs_root *root, struct extent_buffer *buf,
3440                           struct extent_buffer *cow);
3441void btrfs_reloc_pre_snapshot(struct btrfs_trans_handle *trans,
3442                              struct btrfs_pending_snapshot *pending,
3443                              u64 *bytes_to_reserve);
3444int btrfs_reloc_post_snapshot(struct btrfs_trans_handle *trans,
3445                              struct btrfs_pending_snapshot *pending);
3446
3447/* scrub.c */
3448int btrfs_scrub_dev(struct btrfs_root *root, u64 devid, u64 start, u64 end,
3449                    struct btrfs_scrub_progress *progress, int readonly);
3450void btrfs_scrub_pause(struct btrfs_root *root);
3451void btrfs_scrub_pause_super(struct btrfs_root *root);
3452void btrfs_scrub_continue(struct btrfs_root *root);
3453void btrfs_scrub_continue_super(struct btrfs_root *root);
3454int __btrfs_scrub_cancel(struct btrfs_fs_info *info);
3455int btrfs_scrub_cancel(struct btrfs_root *root);
3456int btrfs_scrub_cancel_dev(struct btrfs_root *root, struct btrfs_device *dev);
3457int btrfs_scrub_cancel_devid(struct btrfs_root *root, u64 devid);
3458int btrfs_scrub_progress(struct btrfs_root *root, u64 devid,
3459                         struct btrfs_scrub_progress *progress);
3460
3461/* reada.c */
3462struct reada_control {
3463        struct btrfs_root       *root;          /* tree to prefetch */
3464        struct btrfs_key        key_start;
3465        struct btrfs_key        key_end;        /* exclusive */
3466        atomic_t                elems;
3467        struct kref             refcnt;
3468        wait_queue_head_t       wait;
3469};
3470struct reada_control *btrfs_reada_add(struct btrfs_root *root,
3471                              struct btrfs_key *start, struct btrfs_key *end);
3472int btrfs_reada_wait(void *handle);
3473void btrfs_reada_detach(void *handle);
3474int btree_readahead_hook(struct btrfs_root *root, struct extent_buffer *eb,
3475                         u64 start, int err);
3476
3477/* qgroup.c */
3478struct qgroup_update {
3479        struct list_head list;
3480        struct btrfs_delayed_ref_node *node;
3481        struct btrfs_delayed_extent_op *extent_op;
3482};
3483
3484int btrfs_quota_enable(struct btrfs_trans_handle *trans,
3485                       struct btrfs_fs_info *fs_info);
3486int btrfs_quota_disable(struct btrfs_trans_handle *trans,
3487                        struct btrfs_fs_info *fs_info);
3488int btrfs_quota_rescan(struct btrfs_fs_info *fs_info);
3489int btrfs_add_qgroup_relation(struct btrfs_trans_handle *trans,
3490                              struct btrfs_fs_info *fs_info, u64 src, u64 dst);
3491int btrfs_del_qgroup_relation(struct btrfs_trans_handle *trans,
3492                              struct btrfs_fs_info *fs_info, u64 src, u64 dst);
3493int btrfs_create_qgroup(struct btrfs_trans_handle *trans,
3494                        struct btrfs_fs_info *fs_info, u64 qgroupid,
3495                        char *name);
3496int btrfs_remove_qgroup(struct btrfs_trans_handle *trans,
3497                              struct btrfs_fs_info *fs_info, u64 qgroupid);
3498int btrfs_limit_qgroup(struct btrfs_trans_handle *trans,
3499                       struct btrfs_fs_info *fs_info, u64 qgroupid,
3500                       struct btrfs_qgroup_limit *limit);
3501int btrfs_read_qgroup_config(struct btrfs_fs_info *fs_info);
3502void btrfs_free_qgroup_config(struct btrfs_fs_info *fs_info);
3503struct btrfs_delayed_extent_op;
3504int btrfs_qgroup_record_ref(struct btrfs_trans_handle *trans,
3505                            struct btrfs_delayed_ref_node *node,
3506                            struct btrfs_delayed_extent_op *extent_op);
3507int btrfs_qgroup_account_ref(struct btrfs_trans_handle *trans,
3508                             struct btrfs_fs_info *fs_info,
3509                             struct btrfs_delayed_ref_node *node,
3510                             struct btrfs_delayed_extent_op *extent_op);
3511int btrfs_run_qgroups(struct btrfs_trans_handle *trans,
3512                      struct btrfs_fs_info *fs_info);
3513int btrfs_qgroup_inherit(struct btrfs_trans_handle *trans,
3514                         struct btrfs_fs_info *fs_info, u64 srcid, u64 objectid,
3515                         struct btrfs_qgroup_inherit *inherit);
3516int btrfs_qgroup_reserve(struct btrfs_root *root, u64 num_bytes);
3517void btrfs_qgroup_free(struct btrfs_root *root, u64 num_bytes);
3518
3519void assert_qgroups_uptodate(struct btrfs_trans_handle *trans);
3520
3521static inline int is_fstree(u64 rootid)
3522{
3523        if (rootid == BTRFS_FS_TREE_OBJECTID ||
3524            (s64)rootid >= (s64)BTRFS_FIRST_FREE_OBJECTID)
3525                return 1;
3526        return 0;
3527}
3528#endif
3529
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