include/uapi/linux/btrfs_tree.h

   1 #ifndef _BTRFS_CTREE_H_
   2 #define _BTRFS_CTREE_H_
   3
   4 /*
   5  * This header contains the structure definitions and constants used
   6  * by file system objects that can be retrieved using
   7  * the BTRFS_IOC_SEARCH_TREE ioctl.  That means basically anything that
   8  * is needed to describe a leaf node's key or item contents.
   9  */
  10
  11 /* holds pointers to all of the tree roots */
  12 #define BTRFS_ROOT_TREE_OBJECTID 1ULL
  13
  14 /* stores information about which extents are in use, and reference counts */
  15 #define BTRFS_EXTENT_TREE_OBJECTID 2ULL
  16
  17 /*
  18  * chunk tree stores translations from logical -> physical block numbering
  19  * the super block points to the chunk tree
  20  */
  21 #define BTRFS_CHUNK_TREE_OBJECTID 3ULL
  22
  23 /*
  24  * stores information about which areas of a given device are in use.
  25  * one per device.  The tree of tree roots points to the device tree
  26  */
  27 #define BTRFS_DEV_TREE_OBJECTID 4ULL
  28
  29 /* one per subvolume, storing files and directories */
  30 #define BTRFS_FS_TREE_OBJECTID 5ULL
  31
  32 /* directory objectid inside the root tree */
  33 #define BTRFS_ROOT_TREE_DIR_OBJECTID 6ULL
  34
  35 /* holds checksums of all the data extents */
  36 #define BTRFS_CSUM_TREE_OBJECTID 7ULL
  37
  38 /* holds quota configuration and tracking */
  39 #define BTRFS_QUOTA_TREE_OBJECTID 8ULL
  40
  41 /* for storing items that use the BTRFS_UUID_KEY* types */
  42 #define BTRFS_UUID_TREE_OBJECTID 9ULL
  43
  44 /* tracks free space in block groups. */
  45 #define BTRFS_FREE_SPACE_TREE_OBJECTID 10ULL
  46
  47 /* device stats in the device tree */
  48 #define BTRFS_DEV_STATS_OBJECTID 0ULL
  49
  50 /* for storing balance parameters in the root tree */
  51 #define BTRFS_BALANCE_OBJECTID -4ULL
  52
  53 /* orhpan objectid for tracking unlinked/truncated files */
  54 #define BTRFS_ORPHAN_OBJECTID -5ULL
  55
  56 /* does write ahead logging to speed up fsyncs */
  57 #define BTRFS_TREE_LOG_OBJECTID -6ULL
  58 #define BTRFS_TREE_LOG_FIXUP_OBJECTID -7ULL
  59
  60 /* for space balancing */
  61 #define BTRFS_TREE_RELOC_OBJECTID -8ULL
  62 #define BTRFS_DATA_RELOC_TREE_OBJECTID -9ULL
  63
  64 /*
  65  * extent checksums all have this objectid
  66  * this allows them to share the logging tree
  67  * for fsyncs
  68  */
  69 #define BTRFS_EXTENT_CSUM_OBJECTID -10ULL
  70
  71 /* For storing free space cache */
  72 #define BTRFS_FREE_SPACE_OBJECTID -11ULL
  73
  74 /*
  75  * The inode number assigned to the special inode for storing
  76  * free ino cache
  77  */
  78 #define BTRFS_FREE_INO_OBJECTID -12ULL
  79
  80 /* dummy objectid represents multiple objectids */
  81 #define BTRFS_MULTIPLE_OBJECTIDS -255ULL
  82
  83 /*
  84  * All files have objectids in this range.
  85  */
  86 #define BTRFS_FIRST_FREE_OBJECTID 256ULL
  87 #define BTRFS_LAST_FREE_OBJECTID -256ULL
  88 #define BTRFS_FIRST_CHUNK_TREE_OBJECTID 256ULL
  89
  90
  91 /*
  92  * the device items go into the chunk tree.  The key is in the form
  93  * [ 1 BTRFS_DEV_ITEM_KEY device_id ]
  94  */
  95 #define BTRFS_DEV_ITEMS_OBJECTID 1ULL
  96
  97 #define BTRFS_BTREE_INODE_OBJECTID 1
  98
  99 #define BTRFS_EMPTY_SUBVOL_DIR_OBJECTID 2
 100
 101 #define BTRFS_DEV_REPLACE_DEVID 0ULL
 102
 103 /*
 104  * inode items have the data typically returned from stat and store other
 105  * info about object characteristics.  There is one for every file and dir in
 106  * the FS
 107  */
 108 #define BTRFS_INODE_ITEM_KEY            1
 109 #define BTRFS_INODE_REF_KEY             12
 110 #define BTRFS_INODE_EXTREF_KEY          13
 111 #define BTRFS_XATTR_ITEM_KEY            24
 112 #define BTRFS_ORPHAN_ITEM_KEY           48
 113 /* reserve 2-15 close to the inode for later flexibility */
 114
 115 /*
 116  * dir items are the name -> inode pointers in a directory.  There is one
 117  * for every name in a directory.
 118  */
 119 #define BTRFS_DIR_LOG_ITEM_KEY  60
 120 #define BTRFS_DIR_LOG_INDEX_KEY 72
 121 #define BTRFS_DIR_ITEM_KEY      84
 122 #define BTRFS_DIR_INDEX_KEY     96
 123 /*
 124  * extent data is for file data
 125  */
 126 #define BTRFS_EXTENT_DATA_KEY   108
 127
 128 /*
 129  * extent csums are stored in a separate tree and hold csums for
 130  * an entire extent on disk.
 131  */
 132 #define BTRFS_EXTENT_CSUM_KEY   128
 133
 134 /*
 135  * root items point to tree roots.  They are typically in the root
 136  * tree used by the super block to find all the other trees
 137  */
 138 #define BTRFS_ROOT_ITEM_KEY     132
 139
 140 /*
 141  * root backrefs tie subvols and snapshots to the directory entries that
 142  * reference them
 143  */
 144 #define BTRFS_ROOT_BACKREF_KEY  144
 145
 146 /*
 147  * root refs make a fast index for listing all of the snapshots and
 148  * subvolumes referenced by a given root.  They point directly to the
 149  * directory item in the root that references the subvol
 150  */
 151 #define BTRFS_ROOT_REF_KEY      156
 152
 153 /*
 154  * extent items are in the extent map tree.  These record which blocks
 155  * are used, and how many references there are to each block
 156  */
 157 #define BTRFS_EXTENT_ITEM_KEY   168
 158
 159 /*
 160  * The same as the BTRFS_EXTENT_ITEM_KEY, except it's metadata we already know
 161  * the length, so we save the level in key->offset instead of the length.
 162  */
 163 #define BTRFS_METADATA_ITEM_KEY 169
 164
 165 #define BTRFS_TREE_BLOCK_REF_KEY        176
 166
 167 #define BTRFS_EXTENT_DATA_REF_KEY       178
 168
 169 #define BTRFS_EXTENT_REF_V0_KEY         180
 170
 171 #define BTRFS_SHARED_BLOCK_REF_KEY      182
 172
 173 #define BTRFS_SHARED_DATA_REF_KEY       184
 174
 175 /*
 176  * block groups give us hints into the extent allocation trees.  Which
 177  * blocks are free etc etc
 178  */
 179 #define BTRFS_BLOCK_GROUP_ITEM_KEY 192
 180
 181 /*
 182  * Every block group is represented in the free space tree by a free space info
 183  * item, which stores some accounting information. It is keyed on
 184  * (block_group_start, FREE_SPACE_INFO, block_group_length).
 185  */
 186 #define BTRFS_FREE_SPACE_INFO_KEY 198
 187
 188 /*
 189  * A free space extent tracks an extent of space that is free in a block group.
 190  * It is keyed on (start, FREE_SPACE_EXTENT, length).
 191  */
 192 #define BTRFS_FREE_SPACE_EXTENT_KEY 199
 193
 194 /*
 195  * When a block group becomes very fragmented, we convert it to use bitmaps
 196  * instead of extents. A free space bitmap is keyed on
 197  * (start, FREE_SPACE_BITMAP, length); the corresponding item is a bitmap with
 198  * (length / sectorsize) bits.
 199  */
 200 #define BTRFS_FREE_SPACE_BITMAP_KEY 200
 201
 202 #define BTRFS_DEV_EXTENT_KEY    204
 203 #define BTRFS_DEV_ITEM_KEY      216
 204 #define BTRFS_CHUNK_ITEM_KEY    228
 205
 206 /*
 207  * Records the overall state of the qgroups.
 208  * There's only one instance of this key present,
 209  * (0, BTRFS_QGROUP_STATUS_KEY, 0)
 210  */
 211 #define BTRFS_QGROUP_STATUS_KEY         240
 212 /*
 213  * Records the currently used space of the qgroup.
 214  * One key per qgroup, (0, BTRFS_QGROUP_INFO_KEY, qgroupid).
 215  */
 216 #define BTRFS_QGROUP_INFO_KEY           242
 217 /*
 218  * Contains the user configured limits for the qgroup.
 219  * One key per qgroup, (0, BTRFS_QGROUP_LIMIT_KEY, qgroupid).
 220  */
 221 #define BTRFS_QGROUP_LIMIT_KEY          244
 222 /*
 223  * Records the child-parent relationship of qgroups. For
 224  * each relation, 2 keys are present:
 225  * (childid, BTRFS_QGROUP_RELATION_KEY, parentid)
 226  * (parentid, BTRFS_QGROUP_RELATION_KEY, childid)
 227  */
 228 #define BTRFS_QGROUP_RELATION_KEY       246
 229
 230 /*
 231  * Obsolete name, see BTRFS_TEMPORARY_ITEM_KEY.
 232  */
 233 #define BTRFS_BALANCE_ITEM_KEY  248
 234
 235 /*
 236  * The key type for tree items that are stored persistently, but do not need to
 237  * exist for extended period of time. The items can exist in any tree.
 238  *
 239  * [subtype, BTRFS_TEMPORARY_ITEM_KEY, data]
 240  *
 241  * Existing items:
 242  *
 243  * - balance status item
 244  *   (BTRFS_BALANCE_OBJECTID, BTRFS_TEMPORARY_ITEM_KEY, 0)
 245  */
 246 #define BTRFS_TEMPORARY_ITEM_KEY        248
 247
 248 /*
 249  * Obsolete name, see BTRFS_PERSISTENT_ITEM_KEY
 250  */
 251 #define BTRFS_DEV_STATS_KEY             249
 252
 253 /*
 254  * The key type for tree items that are stored persistently and usually exist
 255  * for a long period, eg. filesystem lifetime. The item kinds can be status
 256  * information, stats or preference values. The item can exist in any tree.
 257  *
 258  * [subtype, BTRFS_PERSISTENT_ITEM_KEY, data]
 259  *
 260  * Existing items:
 261  *
 262  * - device statistics, store IO stats in the device tree, one key for all
 263  *   stats
 264  *   (BTRFS_DEV_STATS_OBJECTID, BTRFS_DEV_STATS_KEY, 0)
 265  */
 266 #define BTRFS_PERSISTENT_ITEM_KEY       249
 267
 268 /*
 269  * Persistantly stores the device replace state in the device tree.
 270  * The key is built like this: (0, BTRFS_DEV_REPLACE_KEY, 0).
 271  */
 272 #define BTRFS_DEV_REPLACE_KEY   250
 273
 274 /*
 275  * Stores items that allow to quickly map UUIDs to something else.
 276  * These items are part of the filesystem UUID tree.
 277  * The key is built like this:
 278  * (UUID_upper_64_bits, BTRFS_UUID_KEY*, UUID_lower_64_bits).
 279  */
 280 #if BTRFS_UUID_SIZE != 16
 281 #error "UUID items require BTRFS_UUID_SIZE == 16!"
 282 #endif
 283 #define BTRFS_UUID_KEY_SUBVOL   251     /* for UUIDs assigned to subvols */
 284 #define BTRFS_UUID_KEY_RECEIVED_SUBVOL  252     /* for UUIDs assigned to
 285                                                  * received subvols */
 286
 287 /*
 288  * string items are for debugging.  They just store a short string of
 289  * data in the FS
 290  */
 291 #define BTRFS_STRING_ITEM_KEY   253
 292
 293
 294
 295 /* 32 bytes in various csum fields */
 296 #define BTRFS_CSUM_SIZE 32
 297
 298 /* csum types */
 299 #define BTRFS_CSUM_TYPE_CRC32   0
 300
 301 /*
 302  * flags definitions for directory entry item type
 303  *
 304  * Used by:
 305  * struct btrfs_dir_item.type
 306  */
 307 #define BTRFS_FT_UNKNOWN        0
 308 #define BTRFS_FT_REG_FILE       1
 309 #define BTRFS_FT_DIR            2
 310 #define BTRFS_FT_CHRDEV         3
 311 #define BTRFS_FT_BLKDEV         4
 312 #define BTRFS_FT_FIFO           5
 313 #define BTRFS_FT_SOCK           6
 314 #define BTRFS_FT_SYMLINK        7
 315 #define BTRFS_FT_XATTR          8
 316 #define BTRFS_FT_MAX            9
 317
 318 /*
 319  * The key defines the order in the tree, and so it also defines (optimal)
 320  * block layout.
 321  *
 322  * objectid corresponds to the inode number.
 323  *
 324  * type tells us things about the object, and is a kind of stream selector.
 325  * so for a given inode, keys with type of 1 might refer to the inode data,
 326  * type of 2 may point to file data in the btree and type == 3 may point to
 327  * extents.
 328  *
 329  * offset is the starting byte offset for this key in the stream.
 330  *
 331  * btrfs_disk_key is in disk byte order.  struct btrfs_key is always
 332  * in cpu native order.  Otherwise they are identical and their sizes
 333  * should be the same (ie both packed)
 334  */
 335 struct btrfs_disk_key {
 336         __le64 objectid;
 337         __u8 type;
 338         __le64 offset;
 339 } __attribute__ ((__packed__));
 340
 341 struct btrfs_key {
 342         __u64 objectid;
 343         __u8 type;
 344         __u64 offset;
 345 } __attribute__ ((__packed__));
 346
 347 struct btrfs_dev_item {
 348         /* the internal btrfs device id */
 349         __le64 devid;
 350
 351         /* size of the device */
 352         __le64 total_bytes;
 353
 354         /* bytes used */
 355         __le64 bytes_used;
 356
 357         /* optimal io alignment for this device */
 358         __le32 io_align;
 359
 360         /* optimal io width for this device */
 361         __le32 io_width;
 362
 363         /* minimal io size for this device */
 364         __le32 sector_size;
 365
 366         /* type and info about this device */
 367         __le64 type;
 368
 369         /* expected generation for this device */
 370         __le64 generation;
 371
 372         /*
 373          * starting byte of this partition on the device,
 374          * to allow for stripe alignment in the future
 375          */
 376         __le64 start_offset;
 377
 378         /* grouping information for allocation decisions */
 379         __le32 dev_group;
 380
 381         /* seek speed 0-100 where 100 is fastest */
 382         __u8 seek_speed;
 383
 384         /* bandwidth 0-100 where 100 is fastest */
 385         __u8 bandwidth;
 386
 387         /* btrfs generated uuid for this device */
 388         __u8 uuid[BTRFS_UUID_SIZE];
 389
 390         /* uuid of FS who owns this device */
 391         __u8 fsid[BTRFS_UUID_SIZE];
 392 } __attribute__ ((__packed__));
 393
 394 struct btrfs_stripe {
 395         __le64 devid;
 396         __le64 offset;
 397         __u8 dev_uuid[BTRFS_UUID_SIZE];
 398 } __attribute__ ((__packed__));
 399
 400 struct btrfs_chunk {
 401         /* size of this chunk in bytes */
 402         __le64 length;
 403
 404         /* objectid of the root referencing this chunk */
 405         __le64 owner;
 406
 407         __le64 stripe_len;
 408         __le64 type;
 409
 410         /* optimal io alignment for this chunk */
 411         __le32 io_align;
 412
 413         /* optimal io width for this chunk */
 414         __le32 io_width;
 415
 416         /* minimal io size for this chunk */
 417         __le32 sector_size;
 418
 419         /* 2^16 stripes is quite a lot, a second limit is the size of a single
 420          * item in the btree
 421          */
 422         __le16 num_stripes;
 423
 424         /* sub stripes only matter for raid10 */
 425         __le16 sub_stripes;
 426         struct btrfs_stripe stripe;
 427         /* additional stripes go here */
 428 } __attribute__ ((__packed__));
 429
 430 #define BTRFS_FREE_SPACE_EXTENT 1
 431 #define BTRFS_FREE_SPACE_BITMAP 2
 432
 433 struct btrfs_free_space_entry {
 434         __le64 offset;
 435         __le64 bytes;
 436         __u8 type;
 437 } __attribute__ ((__packed__));
 438
 439 struct btrfs_free_space_header {
 440         struct btrfs_disk_key location;
 441         __le64 generation;
 442         __le64 num_entries;
 443         __le64 num_bitmaps;
 444 } __attribute__ ((__packed__));
 445
 446 #define BTRFS_HEADER_FLAG_WRITTEN       (1ULL << 0)
 447 #define BTRFS_HEADER_FLAG_RELOC         (1ULL << 1)
 448
 449 /* Super block flags */
 450 /* Errors detected */
 451 #define BTRFS_SUPER_FLAG_ERROR          (1ULL << 2)
 452
 453 #define BTRFS_SUPER_FLAG_SEEDING        (1ULL << 32)
 454 #define BTRFS_SUPER_FLAG_METADUMP       (1ULL << 33)
 455
 456
 457 /*
 458  * items in the extent btree are used to record the objectid of the
 459  * owner of the block and the number of references
 460  */
 461
 462 struct btrfs_extent_item {
 463         __le64 refs;
 464         __le64 generation;
 465         __le64 flags;
 466 } __attribute__ ((__packed__));
 467
 468 struct btrfs_extent_item_v0 {
 469         __le32 refs;
 470 } __attribute__ ((__packed__));
 471
 472
 473 #define BTRFS_EXTENT_FLAG_DATA          (1ULL << 0)
 474 #define BTRFS_EXTENT_FLAG_TREE_BLOCK    (1ULL << 1)
 475
 476 /* following flags only apply to tree blocks */
 477
 478 /* use full backrefs for extent pointers in the block */
 479 #define BTRFS_BLOCK_FLAG_FULL_BACKREF   (1ULL << 8)
 480
 481 /*
 482  * this flag is only used internally by scrub and may be changed at any time
 483  * it is only declared here to avoid collisions
 484  */
 485 #define BTRFS_EXTENT_FLAG_SUPER         (1ULL << 48)
 486
 487 struct btrfs_tree_block_info {
 488         struct btrfs_disk_key key;
 489         __u8 level;
 490 } __attribute__ ((__packed__));
 491
 492 struct btrfs_extent_data_ref {
 493         __le64 root;
 494         __le64 objectid;
 495         __le64 offset;
 496         __le32 count;
 497 } __attribute__ ((__packed__));
 498
 499 struct btrfs_shared_data_ref {
 500         __le32 count;
 501 } __attribute__ ((__packed__));
 502
 503 struct btrfs_extent_inline_ref {
 504         __u8 type;
 505         __le64 offset;
 506 } __attribute__ ((__packed__));
 507
 508 /* old style backrefs item */
 509 struct btrfs_extent_ref_v0 {
 510         __le64 root;
 511         __le64 generation;
 512         __le64 objectid;
 513         __le32 count;
 514 } __attribute__ ((__packed__));
 515
 516
 517 /* dev extents record free space on individual devices.  The owner
 518  * field points back to the chunk allocation mapping tree that allocated
 519  * the extent.  The chunk tree uuid field is a way to double check the owner
 520  */
 521 struct btrfs_dev_extent {
 522         __le64 chunk_tree;
 523         __le64 chunk_objectid;
 524         __le64 chunk_offset;
 525         __le64 length;
 526         __u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
 527 } __attribute__ ((__packed__));
 528
 529 struct btrfs_inode_ref {
 530         __le64 index;
 531         __le16 name_len;
 532         /* name goes here */
 533 } __attribute__ ((__packed__));
 534
 535 struct btrfs_inode_extref {
 536         __le64 parent_objectid;
 537         __le64 index;
 538         __le16 name_len;
 539         __u8   name[0];
 540         /* name goes here */
 541 } __attribute__ ((__packed__));
 542
 543 struct btrfs_timespec {
 544         __le64 sec;
 545         __le32 nsec;
 546 } __attribute__ ((__packed__));
 547
 548 struct btrfs_inode_item {
 549         /* nfs style generation number */
 550         __le64 generation;
 551         /* transid that last touched this inode */
 552         __le64 transid;
 553         __le64 size;
 554         __le64 nbytes;
 555         __le64 block_group;
 556         __le32 nlink;
 557         __le32 uid;
 558         __le32 gid;
 559         __le32 mode;
 560         __le64 rdev;
 561         __le64 flags;
 562
 563         /* modification sequence number for NFS */
 564         __le64 sequence;
 565
 566         /*
 567          * a little future expansion, for more than this we can
 568          * just grow the inode item and version it
 569          */
 570         __le64 reserved[4];
 571         struct btrfs_timespec atime;
 572         struct btrfs_timespec ctime;
 573         struct btrfs_timespec mtime;
 574         struct btrfs_timespec otime;
 575 } __attribute__ ((__packed__));
 576
 577 struct btrfs_dir_log_item {
 578         __le64 end;
 579 } __attribute__ ((__packed__));
 580
 581 struct btrfs_dir_item {
 582         struct btrfs_disk_key location;
 583         __le64 transid;
 584         __le16 data_len;
 585         __le16 name_len;
 586         __u8 type;
 587 } __attribute__ ((__packed__));
 588
 589 #define BTRFS_ROOT_SUBVOL_RDONLY        (1ULL << 0)
 590
 591 /*
 592  * Internal in-memory flag that a subvolume has been marked for deletion but
 593  * still visible as a directory
 594  */
 595 #define BTRFS_ROOT_SUBVOL_DEAD          (1ULL << 48)
 596
 597 struct btrfs_root_item {
 598         struct btrfs_inode_item inode;
 599         __le64 generation;
 600         __le64 root_dirid;
 601         __le64 bytenr;
 602         __le64 byte_limit;
 603         __le64 bytes_used;
 604         __le64 last_snapshot;
 605         __le64 flags;
 606         __le32 refs;
 607         struct btrfs_disk_key drop_progress;
 608         __u8 drop_level;
 609         __u8 level;
 610
 611         /*
 612          * The following fields appear after subvol_uuids+subvol_times
 613          * were introduced.
 614          */
 615
 616         /*
 617          * This generation number is used to test if the new fields are valid
 618          * and up to date while reading the root item. Every time the root item
 619          * is written out, the "generation" field is copied into this field. If
 620          * anyone ever mounted the fs with an older kernel, we will have
 621          * mismatching generation values here and thus must invalidate the
 622          * new fields. See btrfs_update_root and btrfs_find_last_root for
 623          * details.
 624          * the offset of generation_v2 is also used as the start for the memset
 625          * when invalidating the fields.
 626          */
 627         __le64 generation_v2;
 628         __u8 uuid[BTRFS_UUID_SIZE];
 629         __u8 parent_uuid[BTRFS_UUID_SIZE];
 630         __u8 received_uuid[BTRFS_UUID_SIZE];
 631         __le64 ctransid; /* updated when an inode changes */
 632         __le64 otransid; /* trans when created */
 633         __le64 stransid; /* trans when sent. non-zero for received subvol */
 634         __le64 rtransid; /* trans when received. non-zero for received subvol */
 635         struct btrfs_timespec ctime;
 636         struct btrfs_timespec otime;
 637         struct btrfs_timespec stime;
 638         struct btrfs_timespec rtime;
 639         __le64 reserved[8]; /* for future */
 640 } __attribute__ ((__packed__));
 641
 642 /*
 643  * this is used for both forward and backward root refs
 644  */
 645 struct btrfs_root_ref {
 646         __le64 dirid;
 647         __le64 sequence;
 648         __le16 name_len;
 649 } __attribute__ ((__packed__));
 650
 651 struct btrfs_disk_balance_args {
 652         /*
 653          * profiles to operate on, single is denoted by
 654          * BTRFS_AVAIL_ALLOC_BIT_SINGLE
 655          */
 656         __le64 profiles;
 657
 658         /*
 659          * usage filter
 660          * BTRFS_BALANCE_ARGS_USAGE with a single value means '0..N'
 661          * BTRFS_BALANCE_ARGS_USAGE_RANGE - range syntax, min..max
 662          */
 663         union {
 664                 __le64 usage;
 665                 struct {
 666                         __le32 usage_min;
 667                         __le32 usage_max;
 668                 };
 669         };
 670
 671         /* devid filter */
 672         __le64 devid;
 673
 674         /* devid subset filter [pstart..pend) */
 675         __le64 pstart;
 676         __le64 pend;
 677
 678         /* btrfs virtual address space subset filter [vstart..vend) */
 679         __le64 vstart;
 680         __le64 vend;
 681
 682         /*
 683          * profile to convert to, single is denoted by
 684          * BTRFS_AVAIL_ALLOC_BIT_SINGLE
 685          */
 686         __le64 target;
 687
 688         /* BTRFS_BALANCE_ARGS_* */
 689         __le64 flags;
 690
 691         /*
 692          * BTRFS_BALANCE_ARGS_LIMIT with value 'limit'
 693          * BTRFS_BALANCE_ARGS_LIMIT_RANGE - the extend version can use minimum
 694          * and maximum
 695          */
 696         union {
 697                 __le64 limit;
 698                 struct {
 699                         __le32 limit_min;
 700                         __le32 limit_max;
 701                 };
 702         };
 703
 704         /*
 705          * Process chunks that cross stripes_min..stripes_max devices,
 706          * BTRFS_BALANCE_ARGS_STRIPES_RANGE
 707          */
 708         __le32 stripes_min;
 709         __le32 stripes_max;
 710
 711         __le64 unused[6];
 712 } __attribute__ ((__packed__));
 713
 714 /*
 715  * store balance parameters to disk so that balance can be properly
 716  * resumed after crash or unmount
 717  */
 718 struct btrfs_balance_item {
 719         /* BTRFS_BALANCE_* */
 720         __le64 flags;
 721
 722         struct btrfs_disk_balance_args data;
 723         struct btrfs_disk_balance_args meta;
 724         struct btrfs_disk_balance_args sys;
 725
 726         __le64 unused[4];
 727 } __attribute__ ((__packed__));
 728
 729 #define BTRFS_FILE_EXTENT_INLINE 0
 730 #define BTRFS_FILE_EXTENT_REG 1
 731 #define BTRFS_FILE_EXTENT_PREALLOC 2
 732
 733 struct btrfs_file_extent_item {
 734         /*
 735          * transaction id that created this extent
 736          */
 737         __le64 generation;
 738         /*
 739          * max number of bytes to hold this extent in ram
 740          * when we split a compressed extent we can't know how big
 741          * each of the resulting pieces will be.  So, this is
 742          * an upper limit on the size of the extent in ram instead of
 743          * an exact limit.
 744          */
 745         __le64 ram_bytes;
 746
 747         /*
 748          * 32 bits for the various ways we might encode the data,
 749          * including compression and encryption.  If any of these
 750          * are set to something a given disk format doesn't understand
 751          * it is treated like an incompat flag for reading and writing,
 752          * but not for stat.
 753          */
 754         __u8 compression;
 755         __u8 encryption;
 756         __le16 other_encoding; /* spare for later use */
 757
 758         /* are we inline data or a real extent? */
 759         __u8 type;
 760
 761         /*
 762          * disk space consumed by the extent, checksum blocks are included
 763          * in these numbers
 764          *
 765          * At this offset in the structure, the inline extent data start.
 766          */
 767         __le64 disk_bytenr;
 768         __le64 disk_num_bytes;
 769         /*
 770          * the logical offset in file blocks (no csums)
 771          * this extent record is for.  This allows a file extent to point
 772          * into the middle of an existing extent on disk, sharing it
 773          * between two snapshots (useful if some bytes in the middle of the
 774          * extent have changed
 775          */
 776         __le64 offset;
 777         /*
 778          * the logical number of file blocks (no csums included).  This
 779          * always reflects the size uncompressed and without encoding.
 780          */
 781         __le64 num_bytes;
 782
 783 } __attribute__ ((__packed__));
 784
 785 struct btrfs_csum_item {
 786         __u8 csum;
 787 } __attribute__ ((__packed__));
 788
 789 struct btrfs_dev_stats_item {
 790         /*
 791          * grow this item struct at the end for future enhancements and keep
 792          * the existing values unchanged
 793          */
 794         __le64 values[BTRFS_DEV_STAT_VALUES_MAX];
 795 } __attribute__ ((__packed__));
 796
 797 #define BTRFS_DEV_REPLACE_ITEM_CONT_READING_FROM_SRCDEV_MODE_ALWAYS     0
 798 #define BTRFS_DEV_REPLACE_ITEM_CONT_READING_FROM_SRCDEV_MODE_AVOID      1
 799 #define BTRFS_DEV_REPLACE_ITEM_STATE_NEVER_STARTED      0
 800 #define BTRFS_DEV_REPLACE_ITEM_STATE_STARTED            1
 801 #define BTRFS_DEV_REPLACE_ITEM_STATE_SUSPENDED          2
 802 #define BTRFS_DEV_REPLACE_ITEM_STATE_FINISHED           3
 803 #define BTRFS_DEV_REPLACE_ITEM_STATE_CANCELED           4
 804
 805 struct btrfs_dev_replace_item {
 806         /*
 807          * grow this item struct at the end for future enhancements and keep
 808          * the existing values unchanged
 809          */
 810         __le64 src_devid;
 811         __le64 cursor_left;
 812         __le64 cursor_right;
 813         __le64 cont_reading_from_srcdev_mode;
 814
 815         __le64 replace_state;
 816         __le64 time_started;
 817         __le64 time_stopped;
 818         __le64 num_write_errors;
 819         __le64 num_uncorrectable_read_errors;
 820 } __attribute__ ((__packed__));
 821
 822 /* different types of block groups (and chunks) */
 823 #define BTRFS_BLOCK_GROUP_DATA          (1ULL << 0)
 824 #define BTRFS_BLOCK_GROUP_SYSTEM        (1ULL << 1)
 825 #define BTRFS_BLOCK_GROUP_METADATA      (1ULL << 2)
 826 #define BTRFS_BLOCK_GROUP_RAID0         (1ULL << 3)
 827 #define BTRFS_BLOCK_GROUP_RAID1         (1ULL << 4)
 828 #define BTRFS_BLOCK_GROUP_DUP           (1ULL << 5)
 829 #define BTRFS_BLOCK_GROUP_RAID10        (1ULL << 6)
 830 #define BTRFS_BLOCK_GROUP_RAID5         (1ULL << 7)
 831 #define BTRFS_BLOCK_GROUP_RAID6         (1ULL << 8)
 832 #define BTRFS_BLOCK_GROUP_RESERVED      (BTRFS_AVAIL_ALLOC_BIT_SINGLE | \
 833                                          BTRFS_SPACE_INFO_GLOBAL_RSV)
 834
 835 enum btrfs_raid_types {
 836         BTRFS_RAID_RAID10,
 837         BTRFS_RAID_RAID1,
 838         BTRFS_RAID_DUP,
 839         BTRFS_RAID_RAID0,
 840         BTRFS_RAID_SINGLE,
 841         BTRFS_RAID_RAID5,
 842         BTRFS_RAID_RAID6,
 843         BTRFS_NR_RAID_TYPES
 844 };
 845
 846 #define BTRFS_BLOCK_GROUP_TYPE_MASK     (BTRFS_BLOCK_GROUP_DATA |    \
 847                                          BTRFS_BLOCK_GROUP_SYSTEM |  \
 848                                          BTRFS_BLOCK_GROUP_METADATA)
 849
 850 #define BTRFS_BLOCK_GROUP_PROFILE_MASK  (BTRFS_BLOCK_GROUP_RAID0 |   \
 851                                          BTRFS_BLOCK_GROUP_RAID1 |   \
 852                                          BTRFS_BLOCK_GROUP_RAID5 |   \
 853                                          BTRFS_BLOCK_GROUP_RAID6 |   \
 854                                          BTRFS_BLOCK_GROUP_DUP |     \
 855                                          BTRFS_BLOCK_GROUP_RAID10)
 856 #define BTRFS_BLOCK_GROUP_RAID56_MASK   (BTRFS_BLOCK_GROUP_RAID5 |   \
 857                                          BTRFS_BLOCK_GROUP_RAID6)
 858
 859 /*
 860  * We need a bit for restriper to be able to tell when chunks of type
 861  * SINGLE are available.  This "extended" profile format is used in
 862  * fs_info->avail_*_alloc_bits (in-memory) and balance item fields
 863  * (on-disk).  The corresponding on-disk bit in chunk.type is reserved
 864  * to avoid remappings between two formats in future.
 865  */
 866 #define BTRFS_AVAIL_ALLOC_BIT_SINGLE    (1ULL << 48)
 867
 868 /*
 869  * A fake block group type that is used to communicate global block reserve
 870  * size to userspace via the SPACE_INFO ioctl.
 871  */
 872 #define BTRFS_SPACE_INFO_GLOBAL_RSV     (1ULL << 49)
 873
 874 #define BTRFS_EXTENDED_PROFILE_MASK     (BTRFS_BLOCK_GROUP_PROFILE_MASK | \
 875                                          BTRFS_AVAIL_ALLOC_BIT_SINGLE)
 876
 877 static inline __u64 chunk_to_extended(__u64 flags)
 878 {
 879         if ((flags & BTRFS_BLOCK_GROUP_PROFILE_MASK) == 0)
 880                 flags |= BTRFS_AVAIL_ALLOC_BIT_SINGLE;
 881
 882         return flags;
 883 }
 884 static inline __u64 extended_to_chunk(__u64 flags)
 885 {
 886         return flags & ~BTRFS_AVAIL_ALLOC_BIT_SINGLE;
 887 }
 888
 889 struct btrfs_block_group_item {
 890         __le64 used;
 891         __le64 chunk_objectid;
 892         __le64 flags;
 893 } __attribute__ ((__packed__));
 894
 895 struct btrfs_free_space_info {
 896         __le32 extent_count;
 897         __le32 flags;
 898 } __attribute__ ((__packed__));
 899
 900 #define BTRFS_FREE_SPACE_USING_BITMAPS (1ULL << 0)
 901
 902 #define BTRFS_QGROUP_LEVEL_SHIFT                48
 903 static inline __u64 btrfs_qgroup_level(__u64 qgroupid)
 904 {
 905         return qgroupid >> BTRFS_QGROUP_LEVEL_SHIFT;
 906 }
 907
 908 /*
 909  * is subvolume quota turned on?
 910  */
 911 #define BTRFS_QGROUP_STATUS_FLAG_ON             (1ULL << 0)
 912 /*
 913  * RESCAN is set during the initialization phase
 914  */
 915 #define BTRFS_QGROUP_STATUS_FLAG_RESCAN         (1ULL << 1)
 916 /*
 917  * Some qgroup entries are known to be out of date,
 918  * either because the configuration has changed in a way that
 919  * makes a rescan necessary, or because the fs has been mounted
 920  * with a non-qgroup-aware version.
 921  * Turning qouta off and on again makes it inconsistent, too.
 922  */
 923 #define BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT   (1ULL << 2)
 924
 925 #define BTRFS_QGROUP_STATUS_VERSION        1
 926
 927 struct btrfs_qgroup_status_item {
 928         __le64 version;
 929         /*
 930          * the generation is updated during every commit. As older
 931          * versions of btrfs are not aware of qgroups, it will be
 932          * possible to detect inconsistencies by checking the
 933          * generation on mount time
 934          */
 935         __le64 generation;
 936
 937         /* flag definitions see above */
 938         __le64 flags;
 939
 940         /*
 941          * only used during scanning to record the progress
 942          * of the scan. It contains a logical address
 943          */
 944         __le64 rescan;
 945 } __attribute__ ((__packed__));
 946
 947 struct btrfs_qgroup_info_item {
 948         __le64 generation;
 949         __le64 rfer;
 950         __le64 rfer_cmpr;
 951         __le64 excl;
 952         __le64 excl_cmpr;
 953 } __attribute__ ((__packed__));
 954
 955 struct btrfs_qgroup_limit_item {
 956         /*
 957          * only updated when any of the other values change
 958          */
 959         __le64 flags;
 960         __le64 max_rfer;
 961         __le64 max_excl;
 962         __le64 rsv_rfer;
 963         __le64 rsv_excl;
 964 } __attribute__ ((__packed__));
 965
 966 #endif /* _BTRFS_CTREE_H_ */