16f52b16cSGreg Kroah-Hartman /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ 2db671160SJeff Mahoney #ifndef _BTRFS_CTREE_H_ 3db671160SJeff Mahoney #define _BTRFS_CTREE_H_ 4db671160SJeff Mahoney 53a4e7f56SNicolas Dichtel #include <linux/btrfs.h> 69078b4eeSNicolas Dichtel #include <linux/types.h> 71465af12SQu Wenruo #ifdef __KERNEL__ 81465af12SQu Wenruo #include <linux/stddef.h> 91465af12SQu Wenruo #else 101465af12SQu Wenruo #include <stddef.h> 111465af12SQu Wenruo #endif 129078b4eeSNicolas Dichtel 13db671160SJeff Mahoney /* 14db671160SJeff Mahoney * This header contains the structure definitions and constants used 15db671160SJeff Mahoney * by file system objects that can be retrieved using 16db671160SJeff Mahoney * the BTRFS_IOC_SEARCH_TREE ioctl. That means basically anything that 17db671160SJeff Mahoney * is needed to describe a leaf node's key or item contents. 18db671160SJeff Mahoney */ 19db671160SJeff Mahoney 20db671160SJeff Mahoney /* holds pointers to all of the tree roots */ 21db671160SJeff Mahoney #define BTRFS_ROOT_TREE_OBJECTID 1ULL 22db671160SJeff Mahoney 23db671160SJeff Mahoney /* stores information about which extents are in use, and reference counts */ 24db671160SJeff Mahoney #define BTRFS_EXTENT_TREE_OBJECTID 2ULL 25db671160SJeff Mahoney 26db671160SJeff Mahoney /* 27db671160SJeff Mahoney * chunk tree stores translations from logical -> physical block numbering 28db671160SJeff Mahoney * the super block points to the chunk tree 29db671160SJeff Mahoney */ 30db671160SJeff Mahoney #define BTRFS_CHUNK_TREE_OBJECTID 3ULL 31db671160SJeff Mahoney 32db671160SJeff Mahoney /* 33db671160SJeff Mahoney * stores information about which areas of a given device are in use. 34db671160SJeff Mahoney * one per device. The tree of tree roots points to the device tree 35db671160SJeff Mahoney */ 36db671160SJeff Mahoney #define BTRFS_DEV_TREE_OBJECTID 4ULL 37db671160SJeff Mahoney 38db671160SJeff Mahoney /* one per subvolume, storing files and directories */ 39db671160SJeff Mahoney #define BTRFS_FS_TREE_OBJECTID 5ULL 40db671160SJeff Mahoney 41db671160SJeff Mahoney /* directory objectid inside the root tree */ 42db671160SJeff Mahoney #define BTRFS_ROOT_TREE_DIR_OBJECTID 6ULL 43db671160SJeff Mahoney 44db671160SJeff Mahoney /* holds checksums of all the data extents */ 45db671160SJeff Mahoney #define BTRFS_CSUM_TREE_OBJECTID 7ULL 46db671160SJeff Mahoney 47db671160SJeff Mahoney /* holds quota configuration and tracking */ 48db671160SJeff Mahoney #define BTRFS_QUOTA_TREE_OBJECTID 8ULL 49db671160SJeff Mahoney 50db671160SJeff Mahoney /* for storing items that use the BTRFS_UUID_KEY* types */ 51db671160SJeff Mahoney #define BTRFS_UUID_TREE_OBJECTID 9ULL 52db671160SJeff Mahoney 53db671160SJeff Mahoney /* tracks free space in block groups. */ 54db671160SJeff Mahoney #define BTRFS_FREE_SPACE_TREE_OBJECTID 10ULL 55db671160SJeff Mahoney 56db671160SJeff Mahoney /* device stats in the device tree */ 57db671160SJeff Mahoney #define BTRFS_DEV_STATS_OBJECTID 0ULL 58db671160SJeff Mahoney 59db671160SJeff Mahoney /* for storing balance parameters in the root tree */ 60db671160SJeff Mahoney #define BTRFS_BALANCE_OBJECTID -4ULL 61db671160SJeff Mahoney 62*1a9fd417SDavid Sterba /* orphan objectid for tracking unlinked/truncated files */ 63db671160SJeff Mahoney #define BTRFS_ORPHAN_OBJECTID -5ULL 64db671160SJeff Mahoney 65db671160SJeff Mahoney /* does write ahead logging to speed up fsyncs */ 66db671160SJeff Mahoney #define BTRFS_TREE_LOG_OBJECTID -6ULL 67db671160SJeff Mahoney #define BTRFS_TREE_LOG_FIXUP_OBJECTID -7ULL 68db671160SJeff Mahoney 69db671160SJeff Mahoney /* for space balancing */ 70db671160SJeff Mahoney #define BTRFS_TREE_RELOC_OBJECTID -8ULL 71db671160SJeff Mahoney #define BTRFS_DATA_RELOC_TREE_OBJECTID -9ULL 72db671160SJeff Mahoney 73db671160SJeff Mahoney /* 74db671160SJeff Mahoney * extent checksums all have this objectid 75db671160SJeff Mahoney * this allows them to share the logging tree 76db671160SJeff Mahoney * for fsyncs 77db671160SJeff Mahoney */ 78db671160SJeff Mahoney #define BTRFS_EXTENT_CSUM_OBJECTID -10ULL 79db671160SJeff Mahoney 80db671160SJeff Mahoney /* For storing free space cache */ 81db671160SJeff Mahoney #define BTRFS_FREE_SPACE_OBJECTID -11ULL 82db671160SJeff Mahoney 83db671160SJeff Mahoney /* 84db671160SJeff Mahoney * The inode number assigned to the special inode for storing 85db671160SJeff Mahoney * free ino cache 86db671160SJeff Mahoney */ 87db671160SJeff Mahoney #define BTRFS_FREE_INO_OBJECTID -12ULL 88db671160SJeff Mahoney 89db671160SJeff Mahoney /* dummy objectid represents multiple objectids */ 90db671160SJeff Mahoney #define BTRFS_MULTIPLE_OBJECTIDS -255ULL 91db671160SJeff Mahoney 92db671160SJeff Mahoney /* 93db671160SJeff Mahoney * All files have objectids in this range. 94db671160SJeff Mahoney */ 95db671160SJeff Mahoney #define BTRFS_FIRST_FREE_OBJECTID 256ULL 96db671160SJeff Mahoney #define BTRFS_LAST_FREE_OBJECTID -256ULL 97db671160SJeff Mahoney #define BTRFS_FIRST_CHUNK_TREE_OBJECTID 256ULL 98db671160SJeff Mahoney 99db671160SJeff Mahoney 100db671160SJeff Mahoney /* 101db671160SJeff Mahoney * the device items go into the chunk tree. The key is in the form 102db671160SJeff Mahoney * [ 1 BTRFS_DEV_ITEM_KEY device_id ] 103db671160SJeff Mahoney */ 104db671160SJeff Mahoney #define BTRFS_DEV_ITEMS_OBJECTID 1ULL 105db671160SJeff Mahoney 106db671160SJeff Mahoney #define BTRFS_BTREE_INODE_OBJECTID 1 107db671160SJeff Mahoney 108db671160SJeff Mahoney #define BTRFS_EMPTY_SUBVOL_DIR_OBJECTID 2 109db671160SJeff Mahoney 110db671160SJeff Mahoney #define BTRFS_DEV_REPLACE_DEVID 0ULL 111db671160SJeff Mahoney 112db671160SJeff Mahoney /* 113db671160SJeff Mahoney * inode items have the data typically returned from stat and store other 114db671160SJeff Mahoney * info about object characteristics. There is one for every file and dir in 115db671160SJeff Mahoney * the FS 116db671160SJeff Mahoney */ 117db671160SJeff Mahoney #define BTRFS_INODE_ITEM_KEY 1 118db671160SJeff Mahoney #define BTRFS_INODE_REF_KEY 12 119db671160SJeff Mahoney #define BTRFS_INODE_EXTREF_KEY 13 120db671160SJeff Mahoney #define BTRFS_XATTR_ITEM_KEY 24 121db671160SJeff Mahoney #define BTRFS_ORPHAN_ITEM_KEY 48 122db671160SJeff Mahoney /* reserve 2-15 close to the inode for later flexibility */ 123db671160SJeff Mahoney 124db671160SJeff Mahoney /* 125db671160SJeff Mahoney * dir items are the name -> inode pointers in a directory. There is one 126db671160SJeff Mahoney * for every name in a directory. 127db671160SJeff Mahoney */ 128db671160SJeff Mahoney #define BTRFS_DIR_LOG_ITEM_KEY 60 129db671160SJeff Mahoney #define BTRFS_DIR_LOG_INDEX_KEY 72 130db671160SJeff Mahoney #define BTRFS_DIR_ITEM_KEY 84 131db671160SJeff Mahoney #define BTRFS_DIR_INDEX_KEY 96 132db671160SJeff Mahoney /* 133db671160SJeff Mahoney * extent data is for file data 134db671160SJeff Mahoney */ 135db671160SJeff Mahoney #define BTRFS_EXTENT_DATA_KEY 108 136db671160SJeff Mahoney 137db671160SJeff Mahoney /* 138db671160SJeff Mahoney * extent csums are stored in a separate tree and hold csums for 139db671160SJeff Mahoney * an entire extent on disk. 140db671160SJeff Mahoney */ 141db671160SJeff Mahoney #define BTRFS_EXTENT_CSUM_KEY 128 142db671160SJeff Mahoney 143db671160SJeff Mahoney /* 144db671160SJeff Mahoney * root items point to tree roots. They are typically in the root 145db671160SJeff Mahoney * tree used by the super block to find all the other trees 146db671160SJeff Mahoney */ 147db671160SJeff Mahoney #define BTRFS_ROOT_ITEM_KEY 132 148db671160SJeff Mahoney 149db671160SJeff Mahoney /* 150db671160SJeff Mahoney * root backrefs tie subvols and snapshots to the directory entries that 151db671160SJeff Mahoney * reference them 152db671160SJeff Mahoney */ 153db671160SJeff Mahoney #define BTRFS_ROOT_BACKREF_KEY 144 154db671160SJeff Mahoney 155db671160SJeff Mahoney /* 156db671160SJeff Mahoney * root refs make a fast index for listing all of the snapshots and 157db671160SJeff Mahoney * subvolumes referenced by a given root. They point directly to the 158db671160SJeff Mahoney * directory item in the root that references the subvol 159db671160SJeff Mahoney */ 160db671160SJeff Mahoney #define BTRFS_ROOT_REF_KEY 156 161db671160SJeff Mahoney 162db671160SJeff Mahoney /* 163db671160SJeff Mahoney * extent items are in the extent map tree. These record which blocks 164db671160SJeff Mahoney * are used, and how many references there are to each block 165db671160SJeff Mahoney */ 166db671160SJeff Mahoney #define BTRFS_EXTENT_ITEM_KEY 168 167db671160SJeff Mahoney 168db671160SJeff Mahoney /* 169db671160SJeff Mahoney * The same as the BTRFS_EXTENT_ITEM_KEY, except it's metadata we already know 170db671160SJeff Mahoney * the length, so we save the level in key->offset instead of the length. 171db671160SJeff Mahoney */ 172db671160SJeff Mahoney #define BTRFS_METADATA_ITEM_KEY 169 173db671160SJeff Mahoney 174db671160SJeff Mahoney #define BTRFS_TREE_BLOCK_REF_KEY 176 175db671160SJeff Mahoney 176db671160SJeff Mahoney #define BTRFS_EXTENT_DATA_REF_KEY 178 177db671160SJeff Mahoney 178db671160SJeff Mahoney #define BTRFS_EXTENT_REF_V0_KEY 180 179db671160SJeff Mahoney 180db671160SJeff Mahoney #define BTRFS_SHARED_BLOCK_REF_KEY 182 181db671160SJeff Mahoney 182db671160SJeff Mahoney #define BTRFS_SHARED_DATA_REF_KEY 184 183db671160SJeff Mahoney 184db671160SJeff Mahoney /* 185db671160SJeff Mahoney * block groups give us hints into the extent allocation trees. Which 186db671160SJeff Mahoney * blocks are free etc etc 187db671160SJeff Mahoney */ 188db671160SJeff Mahoney #define BTRFS_BLOCK_GROUP_ITEM_KEY 192 189db671160SJeff Mahoney 190db671160SJeff Mahoney /* 191db671160SJeff Mahoney * Every block group is represented in the free space tree by a free space info 192db671160SJeff Mahoney * item, which stores some accounting information. It is keyed on 193db671160SJeff Mahoney * (block_group_start, FREE_SPACE_INFO, block_group_length). 194db671160SJeff Mahoney */ 195db671160SJeff Mahoney #define BTRFS_FREE_SPACE_INFO_KEY 198 196db671160SJeff Mahoney 197db671160SJeff Mahoney /* 198db671160SJeff Mahoney * A free space extent tracks an extent of space that is free in a block group. 199db671160SJeff Mahoney * It is keyed on (start, FREE_SPACE_EXTENT, length). 200db671160SJeff Mahoney */ 201db671160SJeff Mahoney #define BTRFS_FREE_SPACE_EXTENT_KEY 199 202db671160SJeff Mahoney 203db671160SJeff Mahoney /* 204db671160SJeff Mahoney * When a block group becomes very fragmented, we convert it to use bitmaps 205db671160SJeff Mahoney * instead of extents. A free space bitmap is keyed on 206db671160SJeff Mahoney * (start, FREE_SPACE_BITMAP, length); the corresponding item is a bitmap with 207db671160SJeff Mahoney * (length / sectorsize) bits. 208db671160SJeff Mahoney */ 209db671160SJeff Mahoney #define BTRFS_FREE_SPACE_BITMAP_KEY 200 210db671160SJeff Mahoney 211db671160SJeff Mahoney #define BTRFS_DEV_EXTENT_KEY 204 212db671160SJeff Mahoney #define BTRFS_DEV_ITEM_KEY 216 213db671160SJeff Mahoney #define BTRFS_CHUNK_ITEM_KEY 228 214db671160SJeff Mahoney 215db671160SJeff Mahoney /* 216db671160SJeff Mahoney * Records the overall state of the qgroups. 217db671160SJeff Mahoney * There's only one instance of this key present, 218db671160SJeff Mahoney * (0, BTRFS_QGROUP_STATUS_KEY, 0) 219db671160SJeff Mahoney */ 220db671160SJeff Mahoney #define BTRFS_QGROUP_STATUS_KEY 240 221db671160SJeff Mahoney /* 222db671160SJeff Mahoney * Records the currently used space of the qgroup. 223db671160SJeff Mahoney * One key per qgroup, (0, BTRFS_QGROUP_INFO_KEY, qgroupid). 224db671160SJeff Mahoney */ 225db671160SJeff Mahoney #define BTRFS_QGROUP_INFO_KEY 242 226db671160SJeff Mahoney /* 227db671160SJeff Mahoney * Contains the user configured limits for the qgroup. 228db671160SJeff Mahoney * One key per qgroup, (0, BTRFS_QGROUP_LIMIT_KEY, qgroupid). 229db671160SJeff Mahoney */ 230db671160SJeff Mahoney #define BTRFS_QGROUP_LIMIT_KEY 244 231db671160SJeff Mahoney /* 232db671160SJeff Mahoney * Records the child-parent relationship of qgroups. For 233db671160SJeff Mahoney * each relation, 2 keys are present: 234db671160SJeff Mahoney * (childid, BTRFS_QGROUP_RELATION_KEY, parentid) 235db671160SJeff Mahoney * (parentid, BTRFS_QGROUP_RELATION_KEY, childid) 236db671160SJeff Mahoney */ 237db671160SJeff Mahoney #define BTRFS_QGROUP_RELATION_KEY 246 238db671160SJeff Mahoney 239db671160SJeff Mahoney /* 240db671160SJeff Mahoney * Obsolete name, see BTRFS_TEMPORARY_ITEM_KEY. 241db671160SJeff Mahoney */ 242db671160SJeff Mahoney #define BTRFS_BALANCE_ITEM_KEY 248 243db671160SJeff Mahoney 244db671160SJeff Mahoney /* 245db671160SJeff Mahoney * The key type for tree items that are stored persistently, but do not need to 246db671160SJeff Mahoney * exist for extended period of time. The items can exist in any tree. 247db671160SJeff Mahoney * 248db671160SJeff Mahoney * [subtype, BTRFS_TEMPORARY_ITEM_KEY, data] 249db671160SJeff Mahoney * 250db671160SJeff Mahoney * Existing items: 251db671160SJeff Mahoney * 252db671160SJeff Mahoney * - balance status item 253db671160SJeff Mahoney * (BTRFS_BALANCE_OBJECTID, BTRFS_TEMPORARY_ITEM_KEY, 0) 254db671160SJeff Mahoney */ 255db671160SJeff Mahoney #define BTRFS_TEMPORARY_ITEM_KEY 248 256db671160SJeff Mahoney 257db671160SJeff Mahoney /* 258db671160SJeff Mahoney * Obsolete name, see BTRFS_PERSISTENT_ITEM_KEY 259db671160SJeff Mahoney */ 260db671160SJeff Mahoney #define BTRFS_DEV_STATS_KEY 249 261db671160SJeff Mahoney 262db671160SJeff Mahoney /* 263db671160SJeff Mahoney * The key type for tree items that are stored persistently and usually exist 264db671160SJeff Mahoney * for a long period, eg. filesystem lifetime. The item kinds can be status 265db671160SJeff Mahoney * information, stats or preference values. The item can exist in any tree. 266db671160SJeff Mahoney * 267db671160SJeff Mahoney * [subtype, BTRFS_PERSISTENT_ITEM_KEY, data] 268db671160SJeff Mahoney * 269db671160SJeff Mahoney * Existing items: 270db671160SJeff Mahoney * 271db671160SJeff Mahoney * - device statistics, store IO stats in the device tree, one key for all 272db671160SJeff Mahoney * stats 273db671160SJeff Mahoney * (BTRFS_DEV_STATS_OBJECTID, BTRFS_DEV_STATS_KEY, 0) 274db671160SJeff Mahoney */ 275db671160SJeff Mahoney #define BTRFS_PERSISTENT_ITEM_KEY 249 276db671160SJeff Mahoney 277db671160SJeff Mahoney /* 278*1a9fd417SDavid Sterba * Persistently stores the device replace state in the device tree. 279db671160SJeff Mahoney * The key is built like this: (0, BTRFS_DEV_REPLACE_KEY, 0). 280db671160SJeff Mahoney */ 281db671160SJeff Mahoney #define BTRFS_DEV_REPLACE_KEY 250 282db671160SJeff Mahoney 283db671160SJeff Mahoney /* 284db671160SJeff Mahoney * Stores items that allow to quickly map UUIDs to something else. 285db671160SJeff Mahoney * These items are part of the filesystem UUID tree. 286db671160SJeff Mahoney * The key is built like this: 287db671160SJeff Mahoney * (UUID_upper_64_bits, BTRFS_UUID_KEY*, UUID_lower_64_bits). 288db671160SJeff Mahoney */ 289db671160SJeff Mahoney #if BTRFS_UUID_SIZE != 16 290db671160SJeff Mahoney #error "UUID items require BTRFS_UUID_SIZE == 16!" 291db671160SJeff Mahoney #endif 292db671160SJeff Mahoney #define BTRFS_UUID_KEY_SUBVOL 251 /* for UUIDs assigned to subvols */ 293db671160SJeff Mahoney #define BTRFS_UUID_KEY_RECEIVED_SUBVOL 252 /* for UUIDs assigned to 294db671160SJeff Mahoney * received subvols */ 295db671160SJeff Mahoney 296db671160SJeff Mahoney /* 297db671160SJeff Mahoney * string items are for debugging. They just store a short string of 298db671160SJeff Mahoney * data in the FS 299db671160SJeff Mahoney */ 300db671160SJeff Mahoney #define BTRFS_STRING_ITEM_KEY 253 301db671160SJeff Mahoney 302deb67895SQu Wenruo /* Maximum metadata block size (nodesize) */ 303deb67895SQu Wenruo #define BTRFS_MAX_METADATA_BLOCKSIZE 65536 304db671160SJeff Mahoney 305db671160SJeff Mahoney /* 32 bytes in various csum fields */ 306db671160SJeff Mahoney #define BTRFS_CSUM_SIZE 32 307db671160SJeff Mahoney 308db671160SJeff Mahoney /* csum types */ 309e35b79a1SJohannes Thumshirn enum btrfs_csum_type { 310e35b79a1SJohannes Thumshirn BTRFS_CSUM_TYPE_CRC32 = 0, 3113951e7f0SJohannes Thumshirn BTRFS_CSUM_TYPE_XXHASH = 1, 3123831bf00SJohannes Thumshirn BTRFS_CSUM_TYPE_SHA256 = 2, 313352ae07bSDavid Sterba BTRFS_CSUM_TYPE_BLAKE2 = 3, 314e35b79a1SJohannes Thumshirn }; 315db671160SJeff Mahoney 316db671160SJeff Mahoney /* 317db671160SJeff Mahoney * flags definitions for directory entry item type 318db671160SJeff Mahoney * 319db671160SJeff Mahoney * Used by: 320db671160SJeff Mahoney * struct btrfs_dir_item.type 3217d157c3dSPhillip Potter * 3227d157c3dSPhillip Potter * Values 0..7 must match common file type values in fs_types.h. 323db671160SJeff Mahoney */ 324db671160SJeff Mahoney #define BTRFS_FT_UNKNOWN 0 325db671160SJeff Mahoney #define BTRFS_FT_REG_FILE 1 326db671160SJeff Mahoney #define BTRFS_FT_DIR 2 327db671160SJeff Mahoney #define BTRFS_FT_CHRDEV 3 328db671160SJeff Mahoney #define BTRFS_FT_BLKDEV 4 329db671160SJeff Mahoney #define BTRFS_FT_FIFO 5 330db671160SJeff Mahoney #define BTRFS_FT_SOCK 6 331db671160SJeff Mahoney #define BTRFS_FT_SYMLINK 7 332db671160SJeff Mahoney #define BTRFS_FT_XATTR 8 333db671160SJeff Mahoney #define BTRFS_FT_MAX 9 334db671160SJeff Mahoney 335db671160SJeff Mahoney /* 336db671160SJeff Mahoney * The key defines the order in the tree, and so it also defines (optimal) 337db671160SJeff Mahoney * block layout. 338db671160SJeff Mahoney * 339db671160SJeff Mahoney * objectid corresponds to the inode number. 340db671160SJeff Mahoney * 341db671160SJeff Mahoney * type tells us things about the object, and is a kind of stream selector. 342db671160SJeff Mahoney * so for a given inode, keys with type of 1 might refer to the inode data, 343db671160SJeff Mahoney * type of 2 may point to file data in the btree and type == 3 may point to 344db671160SJeff Mahoney * extents. 345db671160SJeff Mahoney * 346db671160SJeff Mahoney * offset is the starting byte offset for this key in the stream. 347db671160SJeff Mahoney * 348db671160SJeff Mahoney * btrfs_disk_key is in disk byte order. struct btrfs_key is always 349db671160SJeff Mahoney * in cpu native order. Otherwise they are identical and their sizes 350db671160SJeff Mahoney * should be the same (ie both packed) 351db671160SJeff Mahoney */ 352db671160SJeff Mahoney struct btrfs_disk_key { 353db671160SJeff Mahoney __le64 objectid; 35414b05c51SJeff Mahoney __u8 type; 355db671160SJeff Mahoney __le64 offset; 356db671160SJeff Mahoney } __attribute__ ((__packed__)); 357db671160SJeff Mahoney 358db671160SJeff Mahoney struct btrfs_key { 35914b05c51SJeff Mahoney __u64 objectid; 36014b05c51SJeff Mahoney __u8 type; 36114b05c51SJeff Mahoney __u64 offset; 362db671160SJeff Mahoney } __attribute__ ((__packed__)); 363db671160SJeff Mahoney 364db671160SJeff Mahoney struct btrfs_dev_item { 365db671160SJeff Mahoney /* the internal btrfs device id */ 366db671160SJeff Mahoney __le64 devid; 367db671160SJeff Mahoney 368db671160SJeff Mahoney /* size of the device */ 369db671160SJeff Mahoney __le64 total_bytes; 370db671160SJeff Mahoney 371db671160SJeff Mahoney /* bytes used */ 372db671160SJeff Mahoney __le64 bytes_used; 373db671160SJeff Mahoney 374db671160SJeff Mahoney /* optimal io alignment for this device */ 375db671160SJeff Mahoney __le32 io_align; 376db671160SJeff Mahoney 377db671160SJeff Mahoney /* optimal io width for this device */ 378db671160SJeff Mahoney __le32 io_width; 379db671160SJeff Mahoney 380db671160SJeff Mahoney /* minimal io size for this device */ 381db671160SJeff Mahoney __le32 sector_size; 382db671160SJeff Mahoney 383db671160SJeff Mahoney /* type and info about this device */ 384db671160SJeff Mahoney __le64 type; 385db671160SJeff Mahoney 386db671160SJeff Mahoney /* expected generation for this device */ 387db671160SJeff Mahoney __le64 generation; 388db671160SJeff Mahoney 389db671160SJeff Mahoney /* 390db671160SJeff Mahoney * starting byte of this partition on the device, 391db671160SJeff Mahoney * to allow for stripe alignment in the future 392db671160SJeff Mahoney */ 393db671160SJeff Mahoney __le64 start_offset; 394db671160SJeff Mahoney 395db671160SJeff Mahoney /* grouping information for allocation decisions */ 396db671160SJeff Mahoney __le32 dev_group; 397db671160SJeff Mahoney 398db671160SJeff Mahoney /* seek speed 0-100 where 100 is fastest */ 39914b05c51SJeff Mahoney __u8 seek_speed; 400db671160SJeff Mahoney 401db671160SJeff Mahoney /* bandwidth 0-100 where 100 is fastest */ 40214b05c51SJeff Mahoney __u8 bandwidth; 403db671160SJeff Mahoney 404db671160SJeff Mahoney /* btrfs generated uuid for this device */ 40514b05c51SJeff Mahoney __u8 uuid[BTRFS_UUID_SIZE]; 406db671160SJeff Mahoney 407db671160SJeff Mahoney /* uuid of FS who owns this device */ 40814b05c51SJeff Mahoney __u8 fsid[BTRFS_UUID_SIZE]; 409db671160SJeff Mahoney } __attribute__ ((__packed__)); 410db671160SJeff Mahoney 411db671160SJeff Mahoney struct btrfs_stripe { 412db671160SJeff Mahoney __le64 devid; 413db671160SJeff Mahoney __le64 offset; 41414b05c51SJeff Mahoney __u8 dev_uuid[BTRFS_UUID_SIZE]; 415db671160SJeff Mahoney } __attribute__ ((__packed__)); 416db671160SJeff Mahoney 417db671160SJeff Mahoney struct btrfs_chunk { 418db671160SJeff Mahoney /* size of this chunk in bytes */ 419db671160SJeff Mahoney __le64 length; 420db671160SJeff Mahoney 421db671160SJeff Mahoney /* objectid of the root referencing this chunk */ 422db671160SJeff Mahoney __le64 owner; 423db671160SJeff Mahoney 424db671160SJeff Mahoney __le64 stripe_len; 425db671160SJeff Mahoney __le64 type; 426db671160SJeff Mahoney 427db671160SJeff Mahoney /* optimal io alignment for this chunk */ 428db671160SJeff Mahoney __le32 io_align; 429db671160SJeff Mahoney 430db671160SJeff Mahoney /* optimal io width for this chunk */ 431db671160SJeff Mahoney __le32 io_width; 432db671160SJeff Mahoney 433db671160SJeff Mahoney /* minimal io size for this chunk */ 434db671160SJeff Mahoney __le32 sector_size; 435db671160SJeff Mahoney 436db671160SJeff Mahoney /* 2^16 stripes is quite a lot, a second limit is the size of a single 437db671160SJeff Mahoney * item in the btree 438db671160SJeff Mahoney */ 439db671160SJeff Mahoney __le16 num_stripes; 440db671160SJeff Mahoney 441db671160SJeff Mahoney /* sub stripes only matter for raid10 */ 442db671160SJeff Mahoney __le16 sub_stripes; 443db671160SJeff Mahoney struct btrfs_stripe stripe; 444db671160SJeff Mahoney /* additional stripes go here */ 445db671160SJeff Mahoney } __attribute__ ((__packed__)); 446db671160SJeff Mahoney 447db671160SJeff Mahoney #define BTRFS_FREE_SPACE_EXTENT 1 448db671160SJeff Mahoney #define BTRFS_FREE_SPACE_BITMAP 2 449db671160SJeff Mahoney 450db671160SJeff Mahoney struct btrfs_free_space_entry { 451db671160SJeff Mahoney __le64 offset; 452db671160SJeff Mahoney __le64 bytes; 45314b05c51SJeff Mahoney __u8 type; 454db671160SJeff Mahoney } __attribute__ ((__packed__)); 455db671160SJeff Mahoney 456db671160SJeff Mahoney struct btrfs_free_space_header { 457db671160SJeff Mahoney struct btrfs_disk_key location; 458db671160SJeff Mahoney __le64 generation; 459db671160SJeff Mahoney __le64 num_entries; 460db671160SJeff Mahoney __le64 num_bitmaps; 461db671160SJeff Mahoney } __attribute__ ((__packed__)); 462db671160SJeff Mahoney 463db671160SJeff Mahoney #define BTRFS_HEADER_FLAG_WRITTEN (1ULL << 0) 464db671160SJeff Mahoney #define BTRFS_HEADER_FLAG_RELOC (1ULL << 1) 465db671160SJeff Mahoney 466db671160SJeff Mahoney /* Super block flags */ 467db671160SJeff Mahoney /* Errors detected */ 468db671160SJeff Mahoney #define BTRFS_SUPER_FLAG_ERROR (1ULL << 2) 469db671160SJeff Mahoney 470db671160SJeff Mahoney #define BTRFS_SUPER_FLAG_SEEDING (1ULL << 32) 471db671160SJeff Mahoney #define BTRFS_SUPER_FLAG_METADUMP (1ULL << 33) 472e2731e55SAnand Jain #define BTRFS_SUPER_FLAG_METADUMP_V2 (1ULL << 34) 47398820a7eSAnand Jain #define BTRFS_SUPER_FLAG_CHANGING_FSID (1ULL << 35) 4747239ff4bSNikolay Borisov #define BTRFS_SUPER_FLAG_CHANGING_FSID_V2 (1ULL << 36) 475db671160SJeff Mahoney 476db671160SJeff Mahoney 477db671160SJeff Mahoney /* 478db671160SJeff Mahoney * items in the extent btree are used to record the objectid of the 479db671160SJeff Mahoney * owner of the block and the number of references 480db671160SJeff Mahoney */ 481db671160SJeff Mahoney 482db671160SJeff Mahoney struct btrfs_extent_item { 483db671160SJeff Mahoney __le64 refs; 484db671160SJeff Mahoney __le64 generation; 485db671160SJeff Mahoney __le64 flags; 486db671160SJeff Mahoney } __attribute__ ((__packed__)); 487db671160SJeff Mahoney 488db671160SJeff Mahoney struct btrfs_extent_item_v0 { 489db671160SJeff Mahoney __le32 refs; 490db671160SJeff Mahoney } __attribute__ ((__packed__)); 491db671160SJeff Mahoney 492db671160SJeff Mahoney 493db671160SJeff Mahoney #define BTRFS_EXTENT_FLAG_DATA (1ULL << 0) 494db671160SJeff Mahoney #define BTRFS_EXTENT_FLAG_TREE_BLOCK (1ULL << 1) 495db671160SJeff Mahoney 496db671160SJeff Mahoney /* following flags only apply to tree blocks */ 497db671160SJeff Mahoney 498db671160SJeff Mahoney /* use full backrefs for extent pointers in the block */ 499db671160SJeff Mahoney #define BTRFS_BLOCK_FLAG_FULL_BACKREF (1ULL << 8) 500db671160SJeff Mahoney 501db671160SJeff Mahoney /* 502db671160SJeff Mahoney * this flag is only used internally by scrub and may be changed at any time 503db671160SJeff Mahoney * it is only declared here to avoid collisions 504db671160SJeff Mahoney */ 505db671160SJeff Mahoney #define BTRFS_EXTENT_FLAG_SUPER (1ULL << 48) 506db671160SJeff Mahoney 507db671160SJeff Mahoney struct btrfs_tree_block_info { 508db671160SJeff Mahoney struct btrfs_disk_key key; 50914b05c51SJeff Mahoney __u8 level; 510db671160SJeff Mahoney } __attribute__ ((__packed__)); 511db671160SJeff Mahoney 512db671160SJeff Mahoney struct btrfs_extent_data_ref { 513db671160SJeff Mahoney __le64 root; 514db671160SJeff Mahoney __le64 objectid; 515db671160SJeff Mahoney __le64 offset; 516db671160SJeff Mahoney __le32 count; 517db671160SJeff Mahoney } __attribute__ ((__packed__)); 518db671160SJeff Mahoney 519db671160SJeff Mahoney struct btrfs_shared_data_ref { 520db671160SJeff Mahoney __le32 count; 521db671160SJeff Mahoney } __attribute__ ((__packed__)); 522db671160SJeff Mahoney 523db671160SJeff Mahoney struct btrfs_extent_inline_ref { 52414b05c51SJeff Mahoney __u8 type; 525db671160SJeff Mahoney __le64 offset; 526db671160SJeff Mahoney } __attribute__ ((__packed__)); 527db671160SJeff Mahoney 528db671160SJeff Mahoney /* dev extents record free space on individual devices. The owner 529db671160SJeff Mahoney * field points back to the chunk allocation mapping tree that allocated 530db671160SJeff Mahoney * the extent. The chunk tree uuid field is a way to double check the owner 531db671160SJeff Mahoney */ 532db671160SJeff Mahoney struct btrfs_dev_extent { 533db671160SJeff Mahoney __le64 chunk_tree; 534db671160SJeff Mahoney __le64 chunk_objectid; 535db671160SJeff Mahoney __le64 chunk_offset; 536db671160SJeff Mahoney __le64 length; 53714b05c51SJeff Mahoney __u8 chunk_tree_uuid[BTRFS_UUID_SIZE]; 538db671160SJeff Mahoney } __attribute__ ((__packed__)); 539db671160SJeff Mahoney 540db671160SJeff Mahoney struct btrfs_inode_ref { 541db671160SJeff Mahoney __le64 index; 542db671160SJeff Mahoney __le16 name_len; 543db671160SJeff Mahoney /* name goes here */ 544db671160SJeff Mahoney } __attribute__ ((__packed__)); 545db671160SJeff Mahoney 546db671160SJeff Mahoney struct btrfs_inode_extref { 547db671160SJeff Mahoney __le64 parent_objectid; 548db671160SJeff Mahoney __le64 index; 549db671160SJeff Mahoney __le16 name_len; 550db671160SJeff Mahoney __u8 name[0]; 551db671160SJeff Mahoney /* name goes here */ 552db671160SJeff Mahoney } __attribute__ ((__packed__)); 553db671160SJeff Mahoney 554db671160SJeff Mahoney struct btrfs_timespec { 555db671160SJeff Mahoney __le64 sec; 556db671160SJeff Mahoney __le32 nsec; 557db671160SJeff Mahoney } __attribute__ ((__packed__)); 558db671160SJeff Mahoney 559db671160SJeff Mahoney struct btrfs_inode_item { 560db671160SJeff Mahoney /* nfs style generation number */ 561db671160SJeff Mahoney __le64 generation; 562db671160SJeff Mahoney /* transid that last touched this inode */ 563db671160SJeff Mahoney __le64 transid; 564db671160SJeff Mahoney __le64 size; 565db671160SJeff Mahoney __le64 nbytes; 566db671160SJeff Mahoney __le64 block_group; 567db671160SJeff Mahoney __le32 nlink; 568db671160SJeff Mahoney __le32 uid; 569db671160SJeff Mahoney __le32 gid; 570db671160SJeff Mahoney __le32 mode; 571db671160SJeff Mahoney __le64 rdev; 572db671160SJeff Mahoney __le64 flags; 573db671160SJeff Mahoney 574db671160SJeff Mahoney /* modification sequence number for NFS */ 575db671160SJeff Mahoney __le64 sequence; 576db671160SJeff Mahoney 577db671160SJeff Mahoney /* 578db671160SJeff Mahoney * a little future expansion, for more than this we can 579db671160SJeff Mahoney * just grow the inode item and version it 580db671160SJeff Mahoney */ 581db671160SJeff Mahoney __le64 reserved[4]; 582db671160SJeff Mahoney struct btrfs_timespec atime; 583db671160SJeff Mahoney struct btrfs_timespec ctime; 584db671160SJeff Mahoney struct btrfs_timespec mtime; 585db671160SJeff Mahoney struct btrfs_timespec otime; 586db671160SJeff Mahoney } __attribute__ ((__packed__)); 587db671160SJeff Mahoney 588db671160SJeff Mahoney struct btrfs_dir_log_item { 589db671160SJeff Mahoney __le64 end; 590db671160SJeff Mahoney } __attribute__ ((__packed__)); 591db671160SJeff Mahoney 592db671160SJeff Mahoney struct btrfs_dir_item { 593db671160SJeff Mahoney struct btrfs_disk_key location; 594db671160SJeff Mahoney __le64 transid; 595db671160SJeff Mahoney __le16 data_len; 596db671160SJeff Mahoney __le16 name_len; 59714b05c51SJeff Mahoney __u8 type; 598db671160SJeff Mahoney } __attribute__ ((__packed__)); 599db671160SJeff Mahoney 600db671160SJeff Mahoney #define BTRFS_ROOT_SUBVOL_RDONLY (1ULL << 0) 601db671160SJeff Mahoney 602db671160SJeff Mahoney /* 603db671160SJeff Mahoney * Internal in-memory flag that a subvolume has been marked for deletion but 604db671160SJeff Mahoney * still visible as a directory 605db671160SJeff Mahoney */ 606db671160SJeff Mahoney #define BTRFS_ROOT_SUBVOL_DEAD (1ULL << 48) 607db671160SJeff Mahoney 608db671160SJeff Mahoney struct btrfs_root_item { 609db671160SJeff Mahoney struct btrfs_inode_item inode; 610db671160SJeff Mahoney __le64 generation; 611db671160SJeff Mahoney __le64 root_dirid; 612db671160SJeff Mahoney __le64 bytenr; 613db671160SJeff Mahoney __le64 byte_limit; 614db671160SJeff Mahoney __le64 bytes_used; 615db671160SJeff Mahoney __le64 last_snapshot; 616db671160SJeff Mahoney __le64 flags; 617db671160SJeff Mahoney __le32 refs; 618db671160SJeff Mahoney struct btrfs_disk_key drop_progress; 61914b05c51SJeff Mahoney __u8 drop_level; 62014b05c51SJeff Mahoney __u8 level; 621db671160SJeff Mahoney 622db671160SJeff Mahoney /* 623db671160SJeff Mahoney * The following fields appear after subvol_uuids+subvol_times 624db671160SJeff Mahoney * were introduced. 625db671160SJeff Mahoney */ 626db671160SJeff Mahoney 627db671160SJeff Mahoney /* 628db671160SJeff Mahoney * This generation number is used to test if the new fields are valid 629db671160SJeff Mahoney * and up to date while reading the root item. Every time the root item 630db671160SJeff Mahoney * is written out, the "generation" field is copied into this field. If 631db671160SJeff Mahoney * anyone ever mounted the fs with an older kernel, we will have 632db671160SJeff Mahoney * mismatching generation values here and thus must invalidate the 633db671160SJeff Mahoney * new fields. See btrfs_update_root and btrfs_find_last_root for 634db671160SJeff Mahoney * details. 635db671160SJeff Mahoney * the offset of generation_v2 is also used as the start for the memset 636db671160SJeff Mahoney * when invalidating the fields. 637db671160SJeff Mahoney */ 638db671160SJeff Mahoney __le64 generation_v2; 63914b05c51SJeff Mahoney __u8 uuid[BTRFS_UUID_SIZE]; 64014b05c51SJeff Mahoney __u8 parent_uuid[BTRFS_UUID_SIZE]; 64114b05c51SJeff Mahoney __u8 received_uuid[BTRFS_UUID_SIZE]; 642db671160SJeff Mahoney __le64 ctransid; /* updated when an inode changes */ 643db671160SJeff Mahoney __le64 otransid; /* trans when created */ 644db671160SJeff Mahoney __le64 stransid; /* trans when sent. non-zero for received subvol */ 645db671160SJeff Mahoney __le64 rtransid; /* trans when received. non-zero for received subvol */ 646db671160SJeff Mahoney struct btrfs_timespec ctime; 647db671160SJeff Mahoney struct btrfs_timespec otime; 648db671160SJeff Mahoney struct btrfs_timespec stime; 649db671160SJeff Mahoney struct btrfs_timespec rtime; 650db671160SJeff Mahoney __le64 reserved[8]; /* for future */ 651db671160SJeff Mahoney } __attribute__ ((__packed__)); 652db671160SJeff Mahoney 653db671160SJeff Mahoney /* 6541465af12SQu Wenruo * Btrfs root item used to be smaller than current size. The old format ends 6551465af12SQu Wenruo * at where member generation_v2 is. 6561465af12SQu Wenruo */ 6571465af12SQu Wenruo static inline __u32 btrfs_legacy_root_item_size(void) 6581465af12SQu Wenruo { 6591465af12SQu Wenruo return offsetof(struct btrfs_root_item, generation_v2); 6601465af12SQu Wenruo } 6611465af12SQu Wenruo 6621465af12SQu Wenruo /* 663db671160SJeff Mahoney * this is used for both forward and backward root refs 664db671160SJeff Mahoney */ 665db671160SJeff Mahoney struct btrfs_root_ref { 666db671160SJeff Mahoney __le64 dirid; 667db671160SJeff Mahoney __le64 sequence; 668db671160SJeff Mahoney __le16 name_len; 669db671160SJeff Mahoney } __attribute__ ((__packed__)); 670db671160SJeff Mahoney 671db671160SJeff Mahoney struct btrfs_disk_balance_args { 672db671160SJeff Mahoney /* 673db671160SJeff Mahoney * profiles to operate on, single is denoted by 674db671160SJeff Mahoney * BTRFS_AVAIL_ALLOC_BIT_SINGLE 675db671160SJeff Mahoney */ 676db671160SJeff Mahoney __le64 profiles; 677db671160SJeff Mahoney 678db671160SJeff Mahoney /* 679db671160SJeff Mahoney * usage filter 680db671160SJeff Mahoney * BTRFS_BALANCE_ARGS_USAGE with a single value means '0..N' 681db671160SJeff Mahoney * BTRFS_BALANCE_ARGS_USAGE_RANGE - range syntax, min..max 682db671160SJeff Mahoney */ 683db671160SJeff Mahoney union { 684db671160SJeff Mahoney __le64 usage; 685db671160SJeff Mahoney struct { 686db671160SJeff Mahoney __le32 usage_min; 687db671160SJeff Mahoney __le32 usage_max; 688db671160SJeff Mahoney }; 689db671160SJeff Mahoney }; 690db671160SJeff Mahoney 691db671160SJeff Mahoney /* devid filter */ 692db671160SJeff Mahoney __le64 devid; 693db671160SJeff Mahoney 694db671160SJeff Mahoney /* devid subset filter [pstart..pend) */ 695db671160SJeff Mahoney __le64 pstart; 696db671160SJeff Mahoney __le64 pend; 697db671160SJeff Mahoney 698db671160SJeff Mahoney /* btrfs virtual address space subset filter [vstart..vend) */ 699db671160SJeff Mahoney __le64 vstart; 700db671160SJeff Mahoney __le64 vend; 701db671160SJeff Mahoney 702db671160SJeff Mahoney /* 703db671160SJeff Mahoney * profile to convert to, single is denoted by 704db671160SJeff Mahoney * BTRFS_AVAIL_ALLOC_BIT_SINGLE 705db671160SJeff Mahoney */ 706db671160SJeff Mahoney __le64 target; 707db671160SJeff Mahoney 708db671160SJeff Mahoney /* BTRFS_BALANCE_ARGS_* */ 709db671160SJeff Mahoney __le64 flags; 710db671160SJeff Mahoney 711db671160SJeff Mahoney /* 712db671160SJeff Mahoney * BTRFS_BALANCE_ARGS_LIMIT with value 'limit' 713db671160SJeff Mahoney * BTRFS_BALANCE_ARGS_LIMIT_RANGE - the extend version can use minimum 714db671160SJeff Mahoney * and maximum 715db671160SJeff Mahoney */ 716db671160SJeff Mahoney union { 717db671160SJeff Mahoney __le64 limit; 718db671160SJeff Mahoney struct { 719db671160SJeff Mahoney __le32 limit_min; 720db671160SJeff Mahoney __le32 limit_max; 721db671160SJeff Mahoney }; 722db671160SJeff Mahoney }; 723db671160SJeff Mahoney 724db671160SJeff Mahoney /* 725db671160SJeff Mahoney * Process chunks that cross stripes_min..stripes_max devices, 726db671160SJeff Mahoney * BTRFS_BALANCE_ARGS_STRIPES_RANGE 727db671160SJeff Mahoney */ 728db671160SJeff Mahoney __le32 stripes_min; 729db671160SJeff Mahoney __le32 stripes_max; 730db671160SJeff Mahoney 731db671160SJeff Mahoney __le64 unused[6]; 732db671160SJeff Mahoney } __attribute__ ((__packed__)); 733db671160SJeff Mahoney 734db671160SJeff Mahoney /* 735db671160SJeff Mahoney * store balance parameters to disk so that balance can be properly 736db671160SJeff Mahoney * resumed after crash or unmount 737db671160SJeff Mahoney */ 738db671160SJeff Mahoney struct btrfs_balance_item { 739db671160SJeff Mahoney /* BTRFS_BALANCE_* */ 740db671160SJeff Mahoney __le64 flags; 741db671160SJeff Mahoney 742db671160SJeff Mahoney struct btrfs_disk_balance_args data; 743db671160SJeff Mahoney struct btrfs_disk_balance_args meta; 744db671160SJeff Mahoney struct btrfs_disk_balance_args sys; 745db671160SJeff Mahoney 746db671160SJeff Mahoney __le64 unused[4]; 747db671160SJeff Mahoney } __attribute__ ((__packed__)); 748db671160SJeff Mahoney 749b9b1a53eSChengguang Xu enum { 750b9b1a53eSChengguang Xu BTRFS_FILE_EXTENT_INLINE = 0, 751b9b1a53eSChengguang Xu BTRFS_FILE_EXTENT_REG = 1, 752b9b1a53eSChengguang Xu BTRFS_FILE_EXTENT_PREALLOC = 2, 753b9b1a53eSChengguang Xu BTRFS_NR_FILE_EXTENT_TYPES = 3, 754b9b1a53eSChengguang Xu }; 755db671160SJeff Mahoney 756db671160SJeff Mahoney struct btrfs_file_extent_item { 757db671160SJeff Mahoney /* 758db671160SJeff Mahoney * transaction id that created this extent 759db671160SJeff Mahoney */ 760db671160SJeff Mahoney __le64 generation; 761db671160SJeff Mahoney /* 762db671160SJeff Mahoney * max number of bytes to hold this extent in ram 763db671160SJeff Mahoney * when we split a compressed extent we can't know how big 764db671160SJeff Mahoney * each of the resulting pieces will be. So, this is 765db671160SJeff Mahoney * an upper limit on the size of the extent in ram instead of 766db671160SJeff Mahoney * an exact limit. 767db671160SJeff Mahoney */ 768db671160SJeff Mahoney __le64 ram_bytes; 769db671160SJeff Mahoney 770db671160SJeff Mahoney /* 771db671160SJeff Mahoney * 32 bits for the various ways we might encode the data, 772db671160SJeff Mahoney * including compression and encryption. If any of these 773db671160SJeff Mahoney * are set to something a given disk format doesn't understand 774db671160SJeff Mahoney * it is treated like an incompat flag for reading and writing, 775db671160SJeff Mahoney * but not for stat. 776db671160SJeff Mahoney */ 77714b05c51SJeff Mahoney __u8 compression; 77814b05c51SJeff Mahoney __u8 encryption; 779db671160SJeff Mahoney __le16 other_encoding; /* spare for later use */ 780db671160SJeff Mahoney 781db671160SJeff Mahoney /* are we inline data or a real extent? */ 78214b05c51SJeff Mahoney __u8 type; 783db671160SJeff Mahoney 784db671160SJeff Mahoney /* 785db671160SJeff Mahoney * disk space consumed by the extent, checksum blocks are included 786db671160SJeff Mahoney * in these numbers 787db671160SJeff Mahoney * 788db671160SJeff Mahoney * At this offset in the structure, the inline extent data start. 789db671160SJeff Mahoney */ 790db671160SJeff Mahoney __le64 disk_bytenr; 791db671160SJeff Mahoney __le64 disk_num_bytes; 792db671160SJeff Mahoney /* 793db671160SJeff Mahoney * the logical offset in file blocks (no csums) 794db671160SJeff Mahoney * this extent record is for. This allows a file extent to point 795db671160SJeff Mahoney * into the middle of an existing extent on disk, sharing it 796db671160SJeff Mahoney * between two snapshots (useful if some bytes in the middle of the 797db671160SJeff Mahoney * extent have changed 798db671160SJeff Mahoney */ 799db671160SJeff Mahoney __le64 offset; 800db671160SJeff Mahoney /* 801db671160SJeff Mahoney * the logical number of file blocks (no csums included). This 802db671160SJeff Mahoney * always reflects the size uncompressed and without encoding. 803db671160SJeff Mahoney */ 804db671160SJeff Mahoney __le64 num_bytes; 805db671160SJeff Mahoney 806db671160SJeff Mahoney } __attribute__ ((__packed__)); 807db671160SJeff Mahoney 808db671160SJeff Mahoney struct btrfs_csum_item { 80914b05c51SJeff Mahoney __u8 csum; 810db671160SJeff Mahoney } __attribute__ ((__packed__)); 811db671160SJeff Mahoney 812db671160SJeff Mahoney struct btrfs_dev_stats_item { 813db671160SJeff Mahoney /* 814db671160SJeff Mahoney * grow this item struct at the end for future enhancements and keep 815db671160SJeff Mahoney * the existing values unchanged 816db671160SJeff Mahoney */ 817db671160SJeff Mahoney __le64 values[BTRFS_DEV_STAT_VALUES_MAX]; 818db671160SJeff Mahoney } __attribute__ ((__packed__)); 819db671160SJeff Mahoney 820db671160SJeff Mahoney #define BTRFS_DEV_REPLACE_ITEM_CONT_READING_FROM_SRCDEV_MODE_ALWAYS 0 821db671160SJeff Mahoney #define BTRFS_DEV_REPLACE_ITEM_CONT_READING_FROM_SRCDEV_MODE_AVOID 1 822db671160SJeff Mahoney 823db671160SJeff Mahoney struct btrfs_dev_replace_item { 824db671160SJeff Mahoney /* 825db671160SJeff Mahoney * grow this item struct at the end for future enhancements and keep 826db671160SJeff Mahoney * the existing values unchanged 827db671160SJeff Mahoney */ 828db671160SJeff Mahoney __le64 src_devid; 829db671160SJeff Mahoney __le64 cursor_left; 830db671160SJeff Mahoney __le64 cursor_right; 831db671160SJeff Mahoney __le64 cont_reading_from_srcdev_mode; 832db671160SJeff Mahoney 833db671160SJeff Mahoney __le64 replace_state; 834db671160SJeff Mahoney __le64 time_started; 835db671160SJeff Mahoney __le64 time_stopped; 836db671160SJeff Mahoney __le64 num_write_errors; 837db671160SJeff Mahoney __le64 num_uncorrectable_read_errors; 838db671160SJeff Mahoney } __attribute__ ((__packed__)); 839db671160SJeff Mahoney 840db671160SJeff Mahoney /* different types of block groups (and chunks) */ 841db671160SJeff Mahoney #define BTRFS_BLOCK_GROUP_DATA (1ULL << 0) 842db671160SJeff Mahoney #define BTRFS_BLOCK_GROUP_SYSTEM (1ULL << 1) 843db671160SJeff Mahoney #define BTRFS_BLOCK_GROUP_METADATA (1ULL << 2) 844db671160SJeff Mahoney #define BTRFS_BLOCK_GROUP_RAID0 (1ULL << 3) 845db671160SJeff Mahoney #define BTRFS_BLOCK_GROUP_RAID1 (1ULL << 4) 846db671160SJeff Mahoney #define BTRFS_BLOCK_GROUP_DUP (1ULL << 5) 847db671160SJeff Mahoney #define BTRFS_BLOCK_GROUP_RAID10 (1ULL << 6) 848db671160SJeff Mahoney #define BTRFS_BLOCK_GROUP_RAID5 (1ULL << 7) 849db671160SJeff Mahoney #define BTRFS_BLOCK_GROUP_RAID6 (1ULL << 8) 85047e6f742SDavid Sterba #define BTRFS_BLOCK_GROUP_RAID1C3 (1ULL << 9) 8518d6fac00SDavid Sterba #define BTRFS_BLOCK_GROUP_RAID1C4 (1ULL << 10) 852db671160SJeff Mahoney #define BTRFS_BLOCK_GROUP_RESERVED (BTRFS_AVAIL_ALLOC_BIT_SINGLE | \ 853db671160SJeff Mahoney BTRFS_SPACE_INFO_GLOBAL_RSV) 854db671160SJeff Mahoney 855db671160SJeff Mahoney enum btrfs_raid_types { 856db671160SJeff Mahoney BTRFS_RAID_RAID10, 857db671160SJeff Mahoney BTRFS_RAID_RAID1, 858db671160SJeff Mahoney BTRFS_RAID_DUP, 859db671160SJeff Mahoney BTRFS_RAID_RAID0, 860db671160SJeff Mahoney BTRFS_RAID_SINGLE, 861db671160SJeff Mahoney BTRFS_RAID_RAID5, 862db671160SJeff Mahoney BTRFS_RAID_RAID6, 86347e6f742SDavid Sterba BTRFS_RAID_RAID1C3, 8648d6fac00SDavid Sterba BTRFS_RAID_RAID1C4, 865db671160SJeff Mahoney BTRFS_NR_RAID_TYPES 866db671160SJeff Mahoney }; 867db671160SJeff Mahoney 868db671160SJeff Mahoney #define BTRFS_BLOCK_GROUP_TYPE_MASK (BTRFS_BLOCK_GROUP_DATA | \ 869db671160SJeff Mahoney BTRFS_BLOCK_GROUP_SYSTEM | \ 870db671160SJeff Mahoney BTRFS_BLOCK_GROUP_METADATA) 871db671160SJeff Mahoney 872db671160SJeff Mahoney #define BTRFS_BLOCK_GROUP_PROFILE_MASK (BTRFS_BLOCK_GROUP_RAID0 | \ 873db671160SJeff Mahoney BTRFS_BLOCK_GROUP_RAID1 | \ 87447e6f742SDavid Sterba BTRFS_BLOCK_GROUP_RAID1C3 | \ 8758d6fac00SDavid Sterba BTRFS_BLOCK_GROUP_RAID1C4 | \ 876db671160SJeff Mahoney BTRFS_BLOCK_GROUP_RAID5 | \ 877db671160SJeff Mahoney BTRFS_BLOCK_GROUP_RAID6 | \ 878db671160SJeff Mahoney BTRFS_BLOCK_GROUP_DUP | \ 879db671160SJeff Mahoney BTRFS_BLOCK_GROUP_RAID10) 880db671160SJeff Mahoney #define BTRFS_BLOCK_GROUP_RAID56_MASK (BTRFS_BLOCK_GROUP_RAID5 | \ 881db671160SJeff Mahoney BTRFS_BLOCK_GROUP_RAID6) 882db671160SJeff Mahoney 88347e6f742SDavid Sterba #define BTRFS_BLOCK_GROUP_RAID1_MASK (BTRFS_BLOCK_GROUP_RAID1 | \ 8848d6fac00SDavid Sterba BTRFS_BLOCK_GROUP_RAID1C3 | \ 8858d6fac00SDavid Sterba BTRFS_BLOCK_GROUP_RAID1C4) 886c7369b3fSDavid Sterba 887db671160SJeff Mahoney /* 888db671160SJeff Mahoney * We need a bit for restriper to be able to tell when chunks of type 889db671160SJeff Mahoney * SINGLE are available. This "extended" profile format is used in 890db671160SJeff Mahoney * fs_info->avail_*_alloc_bits (in-memory) and balance item fields 891db671160SJeff Mahoney * (on-disk). The corresponding on-disk bit in chunk.type is reserved 892db671160SJeff Mahoney * to avoid remappings between two formats in future. 893db671160SJeff Mahoney */ 894db671160SJeff Mahoney #define BTRFS_AVAIL_ALLOC_BIT_SINGLE (1ULL << 48) 895db671160SJeff Mahoney 896db671160SJeff Mahoney /* 897db671160SJeff Mahoney * A fake block group type that is used to communicate global block reserve 898db671160SJeff Mahoney * size to userspace via the SPACE_INFO ioctl. 899db671160SJeff Mahoney */ 900db671160SJeff Mahoney #define BTRFS_SPACE_INFO_GLOBAL_RSV (1ULL << 49) 901db671160SJeff Mahoney 902db671160SJeff Mahoney #define BTRFS_EXTENDED_PROFILE_MASK (BTRFS_BLOCK_GROUP_PROFILE_MASK | \ 903db671160SJeff Mahoney BTRFS_AVAIL_ALLOC_BIT_SINGLE) 904db671160SJeff Mahoney 90514b05c51SJeff Mahoney static inline __u64 chunk_to_extended(__u64 flags) 906db671160SJeff Mahoney { 907db671160SJeff Mahoney if ((flags & BTRFS_BLOCK_GROUP_PROFILE_MASK) == 0) 908db671160SJeff Mahoney flags |= BTRFS_AVAIL_ALLOC_BIT_SINGLE; 909db671160SJeff Mahoney 910db671160SJeff Mahoney return flags; 911db671160SJeff Mahoney } 91214b05c51SJeff Mahoney static inline __u64 extended_to_chunk(__u64 flags) 913db671160SJeff Mahoney { 914db671160SJeff Mahoney return flags & ~BTRFS_AVAIL_ALLOC_BIT_SINGLE; 915db671160SJeff Mahoney } 916db671160SJeff Mahoney 917db671160SJeff Mahoney struct btrfs_block_group_item { 918db671160SJeff Mahoney __le64 used; 919db671160SJeff Mahoney __le64 chunk_objectid; 920db671160SJeff Mahoney __le64 flags; 921db671160SJeff Mahoney } __attribute__ ((__packed__)); 922db671160SJeff Mahoney 923db671160SJeff Mahoney struct btrfs_free_space_info { 924db671160SJeff Mahoney __le32 extent_count; 925db671160SJeff Mahoney __le32 flags; 926db671160SJeff Mahoney } __attribute__ ((__packed__)); 927db671160SJeff Mahoney 928db671160SJeff Mahoney #define BTRFS_FREE_SPACE_USING_BITMAPS (1ULL << 0) 929db671160SJeff Mahoney 930db671160SJeff Mahoney #define BTRFS_QGROUP_LEVEL_SHIFT 48 93106f67c47SQu Wenruo static inline __u16 btrfs_qgroup_level(__u64 qgroupid) 932db671160SJeff Mahoney { 93306f67c47SQu Wenruo return (__u16)(qgroupid >> BTRFS_QGROUP_LEVEL_SHIFT); 934db671160SJeff Mahoney } 935db671160SJeff Mahoney 936db671160SJeff Mahoney /* 937db671160SJeff Mahoney * is subvolume quota turned on? 938db671160SJeff Mahoney */ 939db671160SJeff Mahoney #define BTRFS_QGROUP_STATUS_FLAG_ON (1ULL << 0) 940db671160SJeff Mahoney /* 941db671160SJeff Mahoney * RESCAN is set during the initialization phase 942db671160SJeff Mahoney */ 943db671160SJeff Mahoney #define BTRFS_QGROUP_STATUS_FLAG_RESCAN (1ULL << 1) 944db671160SJeff Mahoney /* 945db671160SJeff Mahoney * Some qgroup entries are known to be out of date, 946db671160SJeff Mahoney * either because the configuration has changed in a way that 947db671160SJeff Mahoney * makes a rescan necessary, or because the fs has been mounted 948db671160SJeff Mahoney * with a non-qgroup-aware version. 949db671160SJeff Mahoney * Turning qouta off and on again makes it inconsistent, too. 950db671160SJeff Mahoney */ 951db671160SJeff Mahoney #define BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT (1ULL << 2) 952db671160SJeff Mahoney 953db671160SJeff Mahoney #define BTRFS_QGROUP_STATUS_VERSION 1 954db671160SJeff Mahoney 955db671160SJeff Mahoney struct btrfs_qgroup_status_item { 956db671160SJeff Mahoney __le64 version; 957db671160SJeff Mahoney /* 958db671160SJeff Mahoney * the generation is updated during every commit. As older 959db671160SJeff Mahoney * versions of btrfs are not aware of qgroups, it will be 960db671160SJeff Mahoney * possible to detect inconsistencies by checking the 961db671160SJeff Mahoney * generation on mount time 962db671160SJeff Mahoney */ 963db671160SJeff Mahoney __le64 generation; 964db671160SJeff Mahoney 965db671160SJeff Mahoney /* flag definitions see above */ 966db671160SJeff Mahoney __le64 flags; 967db671160SJeff Mahoney 968db671160SJeff Mahoney /* 969db671160SJeff Mahoney * only used during scanning to record the progress 970db671160SJeff Mahoney * of the scan. It contains a logical address 971db671160SJeff Mahoney */ 972db671160SJeff Mahoney __le64 rescan; 973db671160SJeff Mahoney } __attribute__ ((__packed__)); 974db671160SJeff Mahoney 975db671160SJeff Mahoney struct btrfs_qgroup_info_item { 976db671160SJeff Mahoney __le64 generation; 977db671160SJeff Mahoney __le64 rfer; 978db671160SJeff Mahoney __le64 rfer_cmpr; 979db671160SJeff Mahoney __le64 excl; 980db671160SJeff Mahoney __le64 excl_cmpr; 981db671160SJeff Mahoney } __attribute__ ((__packed__)); 982db671160SJeff Mahoney 983db671160SJeff Mahoney struct btrfs_qgroup_limit_item { 984db671160SJeff Mahoney /* 985db671160SJeff Mahoney * only updated when any of the other values change 986db671160SJeff Mahoney */ 987db671160SJeff Mahoney __le64 flags; 988db671160SJeff Mahoney __le64 max_rfer; 989db671160SJeff Mahoney __le64 max_excl; 990db671160SJeff Mahoney __le64 rsv_rfer; 991db671160SJeff Mahoney __le64 rsv_excl; 992db671160SJeff Mahoney } __attribute__ ((__packed__)); 993db671160SJeff Mahoney 994db671160SJeff Mahoney #endif /* _BTRFS_CTREE_H_ */ 995