| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Kent Overstreet | 3594 | 99.58% | 109 | 97.32% |
| Janpieter Sollie | 6 | 0.17% | 1 | 0.89% |
| Thomas Bertschinger | 5 | 0.14% | 1 | 0.89% |
| Petr Vorel | 4 | 0.11% | 1 | 0.89% |
| Total | 3609 | 112 |
/* SPDX-License-Identifier: GPL-2.0 */ #ifndef _BCACHEFS_FORMAT_H #define _BCACHEFS_FORMAT_H /* * bcachefs on disk data structures * * OVERVIEW: * * There are three main types of on disk data structures in bcachefs (this is * reduced from 5 in bcache) * * - superblock * - journal * - btree * * The btree is the primary structure; most metadata exists as keys in the * various btrees. There are only a small number of btrees, they're not * sharded - we have one btree for extents, another for inodes, et cetera. * * SUPERBLOCK: * * The superblock contains the location of the journal, the list of devices in * the filesystem, and in general any metadata we need in order to decide * whether we can start a filesystem or prior to reading the journal/btree * roots. * * The superblock is extensible, and most of the contents of the superblock are * in variable length, type tagged fields; see struct bch_sb_field. * * Backup superblocks do not reside in a fixed location; also, superblocks do * not have a fixed size. To locate backup superblocks we have struct * bch_sb_layout; we store a copy of this inside every superblock, and also * before the first superblock. * * JOURNAL: * * The journal primarily records btree updates in the order they occurred; * journal replay consists of just iterating over all the keys in the open * journal entries and re-inserting them into the btrees. * * The journal also contains entry types for the btree roots, and blacklisted * journal sequence numbers (see journal_seq_blacklist.c). * * BTREE: * * bcachefs btrees are copy on write b+ trees, where nodes are big (typically * 128k-256k) and log structured. We use struct btree_node for writing the first * entry in a given node (offset 0), and struct btree_node_entry for all * subsequent writes. * * After the header, btree node entries contain a list of keys in sorted order. * Values are stored inline with the keys; since values are variable length (and * keys effectively are variable length too, due to packing) we can't do random * access without building up additional in memory tables in the btree node read * path. * * BTREE KEYS (struct bkey): * * The various btrees share a common format for the key - so as to avoid * switching in fastpath lookup/comparison code - but define their own * structures for the key values. * * The size of a key/value pair is stored as a u8 in units of u64s, so the max * size is just under 2k. The common part also contains a type tag for the * value, and a format field indicating whether the key is packed or not (and * also meant to allow adding new key fields in the future, if desired). * * bkeys, when stored within a btree node, may also be packed. In that case, the * bkey_format in that node is used to unpack it. Packed bkeys mean that we can * be generous with field sizes in the common part of the key format (64 bit * inode number, 64 bit offset, 96 bit version field, etc.) for negligible cost. */ #include <asm/types.h> #include <asm/byteorder.h> #include <linux/kernel.h> #include <linux/uuid.h> #include <uapi/linux/magic.h> #include "vstructs.h" #ifdef __KERNEL__ typedef uuid_t __uuid_t; #endif #define BITMASK(name, type, field, offset, end) \ static const __maybe_unused unsigned name##_OFFSET = offset; \ static const __maybe_unused unsigned name##_BITS = (end - offset); \ \ static inline __u64 name(const type *k) \ { \ return (k->field >> offset) & ~(~0ULL << (end - offset)); \ } \ \ static inline void SET_##name(type *k, __u64 v) \ { \ k->field &= ~(~(~0ULL << (end - offset)) << offset); \ k->field |= (v & ~(~0ULL << (end - offset))) << offset; \ } #define LE_BITMASK(_bits, name, type, field, offset, end) \ static const __maybe_unused unsigned name##_OFFSET = offset; \ static const __maybe_unused unsigned name##_BITS = (end - offset); \ static const __maybe_unused __u##_bits name##_MAX = (1ULL << (end - offset)) - 1;\ \ static inline __u64 name(const type *k) \ { \ return (__le##_bits##_to_cpu(k->field) >> offset) & \ ~(~0ULL << (end - offset)); \ } \ \ static inline void SET_##name(type *k, __u64 v) \ { \ __u##_bits new = __le##_bits##_to_cpu(k->field); \ \ new &= ~(~(~0ULL << (end - offset)) << offset); \ new |= (v & ~(~0ULL << (end - offset))) << offset; \ k->field = __cpu_to_le##_bits(new); \ } #define LE16_BITMASK(n, t, f, o, e) LE_BITMASK(16, n, t, f, o, e) #define LE32_BITMASK(n, t, f, o, e) LE_BITMASK(32, n, t, f, o, e) #define LE64_BITMASK(n, t, f, o, e) LE_BITMASK(64, n, t, f, o, e) struct bkey_format { __u8 key_u64s; __u8 nr_fields; /* One unused slot for now: */ __u8 bits_per_field[6]; __le64 field_offset[6]; }; /* Btree keys - all units are in sectors */ struct bpos { /* * Word order matches machine byte order - btree code treats a bpos as a * single large integer, for search/comparison purposes * * Note that wherever a bpos is embedded in another on disk data * structure, it has to be byte swabbed when reading in metadata that * wasn't written in native endian order: */ #if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__ __u32 snapshot; __u64 offset; __u64 inode; #elif __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__ __u64 inode; __u64 offset; /* Points to end of extent - sectors */ __u32 snapshot; #else #error edit for your odd byteorder. #endif } __packed #if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__ __aligned(4) #endif ; #define KEY_INODE_MAX ((__u64)~0ULL) #define KEY_OFFSET_MAX ((__u64)~0ULL) #define KEY_SNAPSHOT_MAX ((__u32)~0U) #define KEY_SIZE_MAX ((__u32)~0U) static inline struct bpos SPOS(__u64 inode, __u64 offset, __u32 snapshot) { return (struct bpos) { .inode = inode, .offset = offset, .snapshot = snapshot, }; } #define POS_MIN SPOS(0, 0, 0) #define POS_MAX SPOS(KEY_INODE_MAX, KEY_OFFSET_MAX, 0) #define SPOS_MAX SPOS(KEY_INODE_MAX, KEY_OFFSET_MAX, KEY_SNAPSHOT_MAX) #define POS(_inode, _offset) SPOS(_inode, _offset, 0) /* Empty placeholder struct, for container_of() */ struct bch_val { __u64 __nothing[0]; }; struct bversion { #if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__ __u64 lo; __u32 hi; #elif __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__ __u32 hi; __u64 lo; #endif } __packed #if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__ __aligned(4) #endif ; struct bkey { /* Size of combined key and value, in u64s */ __u8 u64s; /* Format of key (0 for format local to btree node) */ #if defined(__LITTLE_ENDIAN_BITFIELD) __u8 format:7, needs_whiteout:1; #elif defined (__BIG_ENDIAN_BITFIELD) __u8 needs_whiteout:1, format:7; #else #error edit for your odd byteorder. #endif /* Type of the value */ __u8 type; #if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__ __u8 pad[1]; struct bversion version; __u32 size; /* extent size, in sectors */ struct bpos p; #elif __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__ struct bpos p; __u32 size; /* extent size, in sectors */ struct bversion version; __u8 pad[1]; #endif } __packed #if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__ /* * The big-endian version of bkey can't be compiled by rustc with the "aligned" * attr since it doesn't allow types to have both "packed" and "aligned" attrs. * So for Rust compatibility, don't include this. It can be included in the LE * version because the "packed" attr is redundant in that case. * * History: (quoting Kent) * * Specifically, when i was designing bkey, I wanted the header to be no * bigger than necessary so that bkey_packed could use the rest. That means that * decently offten extent keys will fit into only 8 bytes, instead of spilling over * to 16. * * But packed_bkey treats the part after the header - the packed section - * as a single multi word, variable length integer. And bkey, the unpacked * version, is just a special case version of a bkey_packed; all the packed * bkey code will work on keys in any packed format, the in-memory * representation of an unpacked key also is just one type of packed key... * * So that constrains the key part of a bkig endian bkey to start right * after the header. * * If we ever do a bkey_v2 and need to expand the hedaer by another byte for * some reason - that will clean up this wart. */ __aligned(8) #endif ; struct bkey_packed { __u64 _data[0]; /* Size of combined key and value, in u64s */ __u8 u64s; /* Format of key (0 for format local to btree node) */ /* * XXX: next incompat on disk format change, switch format and * needs_whiteout - bkey_packed() will be cheaper if format is the high * bits of the bitfield */ #if defined(__LITTLE_ENDIAN_BITFIELD) __u8 format:7, needs_whiteout:1; #elif defined (__BIG_ENDIAN_BITFIELD) __u8 needs_whiteout:1, format:7; #endif /* Type of the value */ __u8 type; __u8 key_start[0]; /* * We copy bkeys with struct assignment in various places, and while * that shouldn't be done with packed bkeys we can't disallow it in C, * and it's legal to cast a bkey to a bkey_packed - so padding it out * to the same size as struct bkey should hopefully be safest. */ __u8 pad[sizeof(struct bkey) - 3]; } __packed __aligned(8); typedef struct { __le64 lo; __le64 hi; } bch_le128; #define BKEY_U64s (sizeof(struct bkey) / sizeof(__u64)) #define BKEY_U64s_MAX U8_MAX #define BKEY_VAL_U64s_MAX (BKEY_U64s_MAX - BKEY_U64s) #define KEY_PACKED_BITS_START 24 #define KEY_FORMAT_LOCAL_BTREE 0 #define KEY_FORMAT_CURRENT 1 enum bch_bkey_fields { BKEY_FIELD_INODE, BKEY_FIELD_OFFSET, BKEY_FIELD_SNAPSHOT, BKEY_FIELD_SIZE, BKEY_FIELD_VERSION_HI, BKEY_FIELD_VERSION_LO, BKEY_NR_FIELDS, }; #define bkey_format_field(name, field) \ [BKEY_FIELD_##name] = (sizeof(((struct bkey *) NULL)->field) * 8) #define BKEY_FORMAT_CURRENT \ ((struct bkey_format) { \ .key_u64s = BKEY_U64s, \ .nr_fields = BKEY_NR_FIELDS, \ .bits_per_field = { \ bkey_format_field(INODE, p.inode), \ bkey_format_field(OFFSET, p.offset), \ bkey_format_field(SNAPSHOT, p.snapshot), \ bkey_format_field(SIZE, size), \ bkey_format_field(VERSION_HI, version.hi), \ bkey_format_field(VERSION_LO, version.lo), \ }, \ }) /* bkey with inline value */ struct bkey_i { __u64 _data[0]; struct bkey k; struct bch_val v; }; #define POS_KEY(_pos) \ ((struct bkey) { \ .u64s = BKEY_U64s, \ .format = KEY_FORMAT_CURRENT, \ .p = _pos, \ }) #define KEY(_inode, _offset, _size) \ ((struct bkey) { \ .u64s = BKEY_U64s, \ .format = KEY_FORMAT_CURRENT, \ .p = POS(_inode, _offset), \ .size = _size, \ }) static inline void bkey_init(struct bkey *k) { *k = KEY(0, 0, 0); } #define bkey_bytes(_k) ((_k)->u64s * sizeof(__u64)) #define __BKEY_PADDED(key, pad) \ struct bkey_i key; __u64 key ## _pad[pad] /* * - DELETED keys are used internally to mark keys that should be ignored but * override keys in composition order. Their version number is ignored. * * - DISCARDED keys indicate that the data is all 0s because it has been * discarded. DISCARDs may have a version; if the version is nonzero the key * will be persistent, otherwise the key will be dropped whenever the btree * node is rewritten (like DELETED keys). * * - ERROR: any read of the data returns a read error, as the data was lost due * to a failing device. Like DISCARDED keys, they can be removed (overridden) * by new writes or cluster-wide GC. Node repair can also overwrite them with * the same or a more recent version number, but not with an older version * number. * * - WHITEOUT: for hash table btrees */ #define BCH_BKEY_TYPES() \ x(deleted, 0) \ x(whiteout, 1) \ x(error, 2) \ x(cookie, 3) \ x(hash_whiteout, 4) \ x(btree_ptr, 5) \ x(extent, 6) \ x(reservation, 7) \ x(inode, 8) \ x(inode_generation, 9) \ x(dirent, 10) \ x(xattr, 11) \ x(alloc, 12) \ x(quota, 13) \ x(stripe, 14) \ x(reflink_p, 15) \ x(reflink_v, 16) \ x(inline_data, 17) \ x(btree_ptr_v2, 18) \ x(indirect_inline_data, 19) \ x(alloc_v2, 20) \ x(subvolume, 21) \ x(snapshot, 22) \ x(inode_v2, 23) \ x(alloc_v3, 24) \ x(set, 25) \ x(lru, 26) \ x(alloc_v4, 27) \ x(backpointer, 28) \ x(inode_v3, 29) \ x(bucket_gens, 30) \ x(snapshot_tree, 31) \ x(logged_op_truncate, 32) \ x(logged_op_finsert, 33) \ x(accounting, 34) enum bch_bkey_type { #define x(name, nr) KEY_TYPE_##name = nr, BCH_BKEY_TYPES() #undef x KEY_TYPE_MAX, }; struct bch_deleted { struct bch_val v; }; struct bch_whiteout { struct bch_val v; }; struct bch_error { struct bch_val v; }; struct bch_cookie { struct bch_val v; __le64 cookie; }; struct bch_hash_whiteout { struct bch_val v; }; struct bch_set { struct bch_val v; }; /* 128 bits, sufficient for cryptographic MACs: */ struct bch_csum { __le64 lo; __le64 hi; } __packed __aligned(8); struct bch_backpointer { struct bch_val v; __u8 btree_id; __u8 level; __u8 data_type; __u64 bucket_offset:40; __u32 bucket_len; struct bpos pos; } __packed __aligned(8); /* Optional/variable size superblock sections: */ struct bch_sb_field { __u64 _data[0]; __le32 u64s; __le32 type; }; #define BCH_SB_FIELDS() \ x(journal, 0) \ x(members_v1, 1) \ x(crypt, 2) \ x(replicas_v0, 3) \ x(quota, 4) \ x(disk_groups, 5) \ x(clean, 6) \ x(replicas, 7) \ x(journal_seq_blacklist, 8) \ x(journal_v2, 9) \ x(counters, 10) \ x(members_v2, 11) \ x(errors, 12) \ x(ext, 13) \ x(downgrade, 14) #include "alloc_background_format.h" #include "dirent_format.h" #include "disk_accounting_format.h" #include "disk_groups_format.h" #include "extents_format.h" #include "ec_format.h" #include "dirent_format.h" #include "disk_groups_format.h" #include "inode_format.h" #include "journal_seq_blacklist_format.h" #include "logged_ops_format.h" #include "lru_format.h" #include "quota_format.h" #include "reflink_format.h" #include "replicas_format.h" #include "snapshot_format.h" #include "subvolume_format.h" #include "sb-counters_format.h" #include "sb-downgrade_format.h" #include "sb-errors_format.h" #include "sb-members_format.h" #include "xattr_format.h" enum bch_sb_field_type { #define x(f, nr) BCH_SB_FIELD_##f = nr, BCH_SB_FIELDS() #undef x BCH_SB_FIELD_NR }; /* * Most superblock fields are replicated in all device's superblocks - a few are * not: */ #define BCH_SINGLE_DEVICE_SB_FIELDS \ ((1U << BCH_SB_FIELD_journal)| \ (1U << BCH_SB_FIELD_journal_v2)) /* BCH_SB_FIELD_journal: */ struct bch_sb_field_journal { struct bch_sb_field field; __le64 buckets[]; }; struct bch_sb_field_journal_v2 { struct bch_sb_field field; struct bch_sb_field_journal_v2_entry { __le64 start; __le64 nr; } d[]; }; /* BCH_SB_FIELD_crypt: */ struct nonce { __le32 d[4]; }; struct bch_key { __le64 key[4]; }; #define BCH_KEY_MAGIC \ (((__u64) 'b' << 0)|((__u64) 'c' << 8)| \ ((__u64) 'h' << 16)|((__u64) '*' << 24)| \ ((__u64) '*' << 32)|((__u64) 'k' << 40)| \ ((__u64) 'e' << 48)|((__u64) 'y' << 56)) struct bch_encrypted_key { __le64 magic; struct bch_key key; }; /* * If this field is present in the superblock, it stores an encryption key which * is used encrypt all other data/metadata. The key will normally be encrypted * with the key userspace provides, but if encryption has been turned off we'll * just store the master key unencrypted in the superblock so we can access the * previously encrypted data. */ struct bch_sb_field_crypt { struct bch_sb_field field; __le64 flags; __le64 kdf_flags; struct bch_encrypted_key key; }; LE64_BITMASK(BCH_CRYPT_KDF_TYPE, struct bch_sb_field_crypt, flags, 0, 4); enum bch_kdf_types { BCH_KDF_SCRYPT = 0, BCH_KDF_NR = 1, }; /* stored as base 2 log of scrypt params: */ LE64_BITMASK(BCH_KDF_SCRYPT_N, struct bch_sb_field_crypt, kdf_flags, 0, 16); LE64_BITMASK(BCH_KDF_SCRYPT_R, struct bch_sb_field_crypt, kdf_flags, 16, 32); LE64_BITMASK(BCH_KDF_SCRYPT_P, struct bch_sb_field_crypt, kdf_flags, 32, 48); /* * On clean shutdown, store btree roots and current journal sequence number in * the superblock: */ struct jset_entry { __le16 u64s; __u8 btree_id; __u8 level; __u8 type; /* designates what this jset holds */ __u8 pad[3]; struct bkey_i start[0]; __u64 _data[]; }; struct bch_sb_field_clean { struct bch_sb_field field; __le32 flags; __le16 _read_clock; /* no longer used */ __le16 _write_clock; __le64 journal_seq; struct jset_entry start[0]; __u64 _data[]; }; struct bch_sb_field_ext { struct bch_sb_field field; __le64 recovery_passes_required[2]; __le64 errors_silent[8]; __le64 btrees_lost_data; }; /* Superblock: */ /* * New versioning scheme: * One common version number for all on disk data structures - superblock, btree * nodes, journal entries */ #define BCH_VERSION_MAJOR(_v) ((__u16) ((_v) >> 10)) #define BCH_VERSION_MINOR(_v) ((__u16) ((_v) & ~(~0U << 10))) #define BCH_VERSION(_major, _minor) (((_major) << 10)|(_minor) << 0) /* * field 1: version name * field 2: BCH_VERSION(major, minor) * field 3: recovery passess required on upgrade */ #define BCH_METADATA_VERSIONS() \ x(bkey_renumber, BCH_VERSION(0, 10)) \ x(inode_btree_change, BCH_VERSION(0, 11)) \ x(snapshot, BCH_VERSION(0, 12)) \ x(inode_backpointers, BCH_VERSION(0, 13)) \ x(btree_ptr_sectors_written, BCH_VERSION(0, 14)) \ x(snapshot_2, BCH_VERSION(0, 15)) \ x(reflink_p_fix, BCH_VERSION(0, 16)) \ x(subvol_dirent, BCH_VERSION(0, 17)) \ x(inode_v2, BCH_VERSION(0, 18)) \ x(freespace, BCH_VERSION(0, 19)) \ x(alloc_v4, BCH_VERSION(0, 20)) \ x(new_data_types, BCH_VERSION(0, 21)) \ x(backpointers, BCH_VERSION(0, 22)) \ x(inode_v3, BCH_VERSION(0, 23)) \ x(unwritten_extents, BCH_VERSION(0, 24)) \ x(bucket_gens, BCH_VERSION(0, 25)) \ x(lru_v2, BCH_VERSION(0, 26)) \ x(fragmentation_lru, BCH_VERSION(0, 27)) \ x(no_bps_in_alloc_keys, BCH_VERSION(0, 28)) \ x(snapshot_trees, BCH_VERSION(0, 29)) \ x(major_minor, BCH_VERSION(1, 0)) \ x(snapshot_skiplists, BCH_VERSION(1, 1)) \ x(deleted_inodes, BCH_VERSION(1, 2)) \ x(rebalance_work, BCH_VERSION(1, 3)) \ x(member_seq, BCH_VERSION(1, 4)) \ x(subvolume_fs_parent, BCH_VERSION(1, 5)) \ x(btree_subvolume_children, BCH_VERSION(1, 6)) \ x(mi_btree_bitmap, BCH_VERSION(1, 7)) \ x(bucket_stripe_sectors, BCH_VERSION(1, 8)) \ x(disk_accounting_v2, BCH_VERSION(1, 9)) \ x(disk_accounting_v3, BCH_VERSION(1, 10)) \ x(disk_accounting_inum, BCH_VERSION(1, 11)) \ x(rebalance_work_acct_fix, BCH_VERSION(1, 12)) enum bcachefs_metadata_version { bcachefs_metadata_version_min = 9, #define x(t, n) bcachefs_metadata_version_##t = n, BCH_METADATA_VERSIONS() #undef x bcachefs_metadata_version_max }; static const __maybe_unused unsigned bcachefs_metadata_required_upgrade_below = bcachefs_metadata_version_rebalance_work; #define bcachefs_metadata_version_current (bcachefs_metadata_version_max - 1) #define BCH_SB_SECTOR 8 #define BCH_SB_LAYOUT_SIZE_BITS_MAX 16 /* 32 MB */ struct bch_sb_layout { __uuid_t magic; /* bcachefs superblock UUID */ __u8 layout_type; __u8 sb_max_size_bits; /* base 2 of 512 byte sectors */ __u8 nr_superblocks; __u8 pad[5]; __le64 sb_offset[61]; } __packed __aligned(8); #define BCH_SB_LAYOUT_SECTOR 7 /* * @offset - sector where this sb was written * @version - on disk format version * @version_min - Oldest metadata version this filesystem contains; so we can * safely drop compatibility code and refuse to mount filesystems * we'd need it for * @magic - identifies as a bcachefs superblock (BCHFS_MAGIC) * @seq - incremented each time superblock is written * @uuid - used for generating various magic numbers and identifying * member devices, never changes * @user_uuid - user visible UUID, may be changed * @label - filesystem label * @seq - identifies most recent superblock, incremented each time * superblock is written * @features - enabled incompatible features */ struct bch_sb { struct bch_csum csum; __le16 version; __le16 version_min; __le16 pad[2]; __uuid_t magic; __uuid_t uuid; __uuid_t user_uuid; __u8 label[BCH_SB_LABEL_SIZE]; __le64 offset; __le64 seq; __le16 block_size; __u8 dev_idx; __u8 nr_devices; __le32 u64s; __le64 time_base_lo; __le32 time_base_hi; __le32 time_precision; __le64 flags[7]; __le64 write_time; __le64 features[2]; __le64 compat[2]; struct bch_sb_layout layout; struct bch_sb_field start[0]; __le64 _data[]; } __packed __aligned(8); /* * Flags: * BCH_SB_INITALIZED - set on first mount * BCH_SB_CLEAN - did we shut down cleanly? Just a hint, doesn't affect * behaviour of mount/recovery path: * BCH_SB_INODE_32BIT - limit inode numbers to 32 bits * BCH_SB_128_BIT_MACS - 128 bit macs instead of 80 * BCH_SB_ENCRYPTION_TYPE - if nonzero encryption is enabled; overrides * DATA/META_CSUM_TYPE. Also indicates encryption * algorithm in use, if/when we get more than one */ LE16_BITMASK(BCH_SB_BLOCK_SIZE, struct bch_sb, block_size, 0, 16); LE64_BITMASK(BCH_SB_INITIALIZED, struct bch_sb, flags[0], 0, 1); LE64_BITMASK(BCH_SB_CLEAN, struct bch_sb, flags[0], 1, 2); LE64_BITMASK(BCH_SB_CSUM_TYPE, struct bch_sb, flags[0], 2, 8); LE64_BITMASK(BCH_SB_ERROR_ACTION, struct bch_sb, flags[0], 8, 12); LE64_BITMASK(BCH_SB_BTREE_NODE_SIZE, struct bch_sb, flags[0], 12, 28); LE64_BITMASK(BCH_SB_GC_RESERVE, struct bch_sb, flags[0], 28, 33); LE64_BITMASK(BCH_SB_ROOT_RESERVE, struct bch_sb, flags[0], 33, 40); LE64_BITMASK(BCH_SB_META_CSUM_TYPE, struct bch_sb, flags[0], 40, 44); LE64_BITMASK(BCH_SB_DATA_CSUM_TYPE, struct bch_sb, flags[0], 44, 48); LE64_BITMASK(BCH_SB_META_REPLICAS_WANT, struct bch_sb, flags[0], 48, 52); LE64_BITMASK(BCH_SB_DATA_REPLICAS_WANT, struct bch_sb, flags[0], 52, 56); LE64_BITMASK(BCH_SB_POSIX_ACL, struct bch_sb, flags[0], 56, 57); LE64_BITMASK(BCH_SB_USRQUOTA, struct bch_sb, flags[0], 57, 58); LE64_BITMASK(BCH_SB_GRPQUOTA, struct bch_sb, flags[0], 58, 59); LE64_BITMASK(BCH_SB_PRJQUOTA, struct bch_sb, flags[0], 59, 60); LE64_BITMASK(BCH_SB_HAS_ERRORS, struct bch_sb, flags[0], 60, 61); LE64_BITMASK(BCH_SB_HAS_TOPOLOGY_ERRORS,struct bch_sb, flags[0], 61, 62); LE64_BITMASK(BCH_SB_BIG_ENDIAN, struct bch_sb, flags[0], 62, 63); LE64_BITMASK(BCH_SB_STR_HASH_TYPE, struct bch_sb, flags[1], 0, 4); LE64_BITMASK(BCH_SB_COMPRESSION_TYPE_LO,struct bch_sb, flags[1], 4, 8); LE64_BITMASK(BCH_SB_INODE_32BIT, struct bch_sb, flags[1], 8, 9); LE64_BITMASK(BCH_SB_128_BIT_MACS, struct bch_sb, flags[1], 9, 10); LE64_BITMASK(BCH_SB_ENCRYPTION_TYPE, struct bch_sb, flags[1], 10, 14); /* * Max size of an extent that may require bouncing to read or write * (checksummed, compressed): 64k */ LE64_BITMASK(BCH_SB_ENCODED_EXTENT_MAX_BITS, struct bch_sb, flags[1], 14, 20); LE64_BITMASK(BCH_SB_META_REPLICAS_REQ, struct bch_sb, flags[1], 20, 24); LE64_BITMASK(BCH_SB_DATA_REPLICAS_REQ, struct bch_sb, flags[1], 24, 28); LE64_BITMASK(BCH_SB_PROMOTE_TARGET, struct bch_sb, flags[1], 28, 40); LE64_BITMASK(BCH_SB_FOREGROUND_TARGET, struct bch_sb, flags[1], 40, 52); LE64_BITMASK(BCH_SB_BACKGROUND_TARGET, struct bch_sb, flags[1], 52, 64); LE64_BITMASK(BCH_SB_BACKGROUND_COMPRESSION_TYPE_LO, struct bch_sb, flags[2], 0, 4); LE64_BITMASK(BCH_SB_GC_RESERVE_BYTES, struct bch_sb, flags[2], 4, 64); LE64_BITMASK(BCH_SB_ERASURE_CODE, struct bch_sb, flags[3], 0, 16); LE64_BITMASK(BCH_SB_METADATA_TARGET, struct bch_sb, flags[3], 16, 28); LE64_BITMASK(BCH_SB_SHARD_INUMS, struct bch_sb, flags[3], 28, 29); LE64_BITMASK(BCH_SB_INODES_USE_KEY_CACHE,struct bch_sb, flags[3], 29, 30); LE64_BITMASK(BCH_SB_JOURNAL_FLUSH_DELAY,struct bch_sb, flags[3], 30, 62); LE64_BITMASK(BCH_SB_JOURNAL_FLUSH_DISABLED,struct bch_sb, flags[3], 62, 63); LE64_BITMASK(BCH_SB_JOURNAL_RECLAIM_DELAY,struct bch_sb, flags[4], 0, 32); LE64_BITMASK(BCH_SB_JOURNAL_TRANSACTION_NAMES,struct bch_sb, flags[4], 32, 33); LE64_BITMASK(BCH_SB_NOCOW, struct bch_sb, flags[4], 33, 34); LE64_BITMASK(BCH_SB_WRITE_BUFFER_SIZE, struct bch_sb, flags[4], 34, 54); LE64_BITMASK(BCH_SB_VERSION_UPGRADE, struct bch_sb, flags[4], 54, 56); LE64_BITMASK(BCH_SB_COMPRESSION_TYPE_HI,struct bch_sb, flags[4], 56, 60); LE64_BITMASK(BCH_SB_BACKGROUND_COMPRESSION_TYPE_HI, struct bch_sb, flags[4], 60, 64); LE64_BITMASK(BCH_SB_VERSION_UPGRADE_COMPLETE, struct bch_sb, flags[5], 0, 16); LE64_BITMASK(BCH_SB_ALLOCATOR_STUCK_TIMEOUT, struct bch_sb, flags[5], 16, 32); static inline __u64 BCH_SB_COMPRESSION_TYPE(const struct bch_sb *sb) { return BCH_SB_COMPRESSION_TYPE_LO(sb) | (BCH_SB_COMPRESSION_TYPE_HI(sb) << 4); } static inline void SET_BCH_SB_COMPRESSION_TYPE(struct bch_sb *sb, __u64 v) { SET_BCH_SB_COMPRESSION_TYPE_LO(sb, v); SET_BCH_SB_COMPRESSION_TYPE_HI(sb, v >> 4); } static inline __u64 BCH_SB_BACKGROUND_COMPRESSION_TYPE(const struct bch_sb *sb) { return BCH_SB_BACKGROUND_COMPRESSION_TYPE_LO(sb) | (BCH_SB_BACKGROUND_COMPRESSION_TYPE_HI(sb) << 4); } static inline void SET_BCH_SB_BACKGROUND_COMPRESSION_TYPE(struct bch_sb *sb, __u64 v) { SET_BCH_SB_BACKGROUND_COMPRESSION_TYPE_LO(sb, v); SET_BCH_SB_BACKGROUND_COMPRESSION_TYPE_HI(sb, v >> 4); } /* * Features: * * journal_seq_blacklist_v3: gates BCH_SB_FIELD_journal_seq_blacklist * reflink: gates KEY_TYPE_reflink * inline_data: gates KEY_TYPE_inline_data * new_siphash: gates BCH_STR_HASH_siphash * new_extent_overwrite: gates BTREE_NODE_NEW_EXTENT_OVERWRITE */ #define BCH_SB_FEATURES() \ x(lz4, 0) \ x(gzip, 1) \ x(zstd, 2) \ x(atomic_nlink, 3) \ x(ec, 4) \ x(journal_seq_blacklist_v3, 5) \ x(reflink, 6) \ x(new_siphash, 7) \ x(inline_data, 8) \ x(new_extent_overwrite, 9) \ x(incompressible, 10) \ x(btree_ptr_v2, 11) \ x(extents_above_btree_updates, 12) \ x(btree_updates_journalled, 13) \ x(reflink_inline_data, 14) \ x(new_varint, 15) \ x(journal_no_flush, 16) \ x(alloc_v2, 17) \ x(extents_across_btree_nodes, 18) #define BCH_SB_FEATURES_ALWAYS \ ((1ULL << BCH_FEATURE_new_extent_overwrite)| \ (1ULL << BCH_FEATURE_extents_above_btree_updates)|\ (1ULL << BCH_FEATURE_btree_updates_journalled)|\ (1ULL << BCH_FEATURE_alloc_v2)|\ (1ULL << BCH_FEATURE_extents_across_btree_nodes)) #define BCH_SB_FEATURES_ALL \ (BCH_SB_FEATURES_ALWAYS| \ (1ULL << BCH_FEATURE_new_siphash)| \ (1ULL << BCH_FEATURE_btree_ptr_v2)| \ (1ULL << BCH_FEATURE_new_varint)| \ (1ULL << BCH_FEATURE_journal_no_flush)) enum bch_sb_feature { #define x(f, n) BCH_FEATURE_##f, BCH_SB_FEATURES() #undef x BCH_FEATURE_NR, }; #define BCH_SB_COMPAT() \ x(alloc_info, 0) \ x(alloc_metadata, 1) \ x(extents_above_btree_updates_done, 2) \ x(bformat_overflow_done, 3) enum bch_sb_compat { #define x(f, n) BCH_COMPAT_##f, BCH_SB_COMPAT() #undef x BCH_COMPAT_NR, }; /* options: */ #define BCH_VERSION_UPGRADE_OPTS() \ x(compatible, 0) \ x(incompatible, 1) \ x(none, 2) enum bch_version_upgrade_opts { #define x(t, n) BCH_VERSION_UPGRADE_##t = n, BCH_VERSION_UPGRADE_OPTS() #undef x }; #define BCH_REPLICAS_MAX 4U #define BCH_BKEY_PTRS_MAX 16U #define BCH_ERROR_ACTIONS() \ x(continue, 0) \ x(fix_safe, 1) \ x(panic, 2) \ x(ro, 3) enum bch_error_actions { #define x(t, n) BCH_ON_ERROR_##t = n, BCH_ERROR_ACTIONS() #undef x BCH_ON_ERROR_NR }; #define BCH_STR_HASH_TYPES() \ x(crc32c, 0) \ x(crc64, 1) \ x(siphash_old, 2) \ x(siphash, 3) enum bch_str_hash_type { #define x(t, n) BCH_STR_HASH_##t = n, BCH_STR_HASH_TYPES() #undef x BCH_STR_HASH_NR }; #define BCH_STR_HASH_OPTS() \ x(crc32c, 0) \ x(crc64, 1) \ x(siphash, 2) enum bch_str_hash_opts { #define x(t, n) BCH_STR_HASH_OPT_##t = n, BCH_STR_HASH_OPTS() #undef x BCH_STR_HASH_OPT_NR }; #define BCH_CSUM_TYPES() \ x(none, 0) \ x(crc32c_nonzero, 1) \ x(crc64_nonzero, 2) \ x(chacha20_poly1305_80, 3) \ x(chacha20_poly1305_128, 4) \ x(crc32c, 5) \ x(crc64, 6) \ x(xxhash, 7) enum bch_csum_type { #define x(t, n) BCH_CSUM_##t = n, BCH_CSUM_TYPES() #undef x BCH_CSUM_NR }; static const __maybe_unused unsigned bch_crc_bytes[] = { [BCH_CSUM_none] = 0, [BCH_CSUM_crc32c_nonzero] = 4, [BCH_CSUM_crc32c] = 4, [BCH_CSUM_crc64_nonzero] = 8, [BCH_CSUM_crc64] = 8, [BCH_CSUM_xxhash] = 8, [BCH_CSUM_chacha20_poly1305_80] = 10, [BCH_CSUM_chacha20_poly1305_128] = 16, }; static inline _Bool bch2_csum_type_is_encryption(enum bch_csum_type type) { switch (type) { case BCH_CSUM_chacha20_poly1305_80: case BCH_CSUM_chacha20_poly1305_128: return true; default: return false; } } #define BCH_CSUM_OPTS() \ x(none, 0) \ x(crc32c, 1) \ x(crc64, 2) \ x(xxhash, 3) enum bch_csum_opts { #define x(t, n) BCH_CSUM_OPT_##t = n, BCH_CSUM_OPTS() #undef x BCH_CSUM_OPT_NR }; #define BCH_COMPRESSION_TYPES() \ x(none, 0) \ x(lz4_old, 1) \ x(gzip, 2) \ x(lz4, 3) \ x(zstd, 4) \ x(incompressible, 5) enum bch_compression_type { #define x(t, n) BCH_COMPRESSION_TYPE_##t = n, BCH_COMPRESSION_TYPES() #undef x BCH_COMPRESSION_TYPE_NR }; #define BCH_COMPRESSION_OPTS() \ x(none, 0) \ x(lz4, 1) \ x(gzip, 2) \ x(zstd, 3) enum bch_compression_opts { #define x(t, n) BCH_COMPRESSION_OPT_##t = n, BCH_COMPRESSION_OPTS() #undef x BCH_COMPRESSION_OPT_NR }; /* * Magic numbers * * The various other data structures have their own magic numbers, which are * xored with the first part of the cache set's UUID */ #define BCACHE_MAGIC \ UUID_INIT(0xc68573f6, 0x4e1a, 0x45ca, \ 0x82, 0x65, 0xf5, 0x7f, 0x48, 0xba, 0x6d, 0x81) #define BCHFS_MAGIC \ UUID_INIT(0xc68573f6, 0x66ce, 0x90a9, \ 0xd9, 0x6a, 0x60, 0xcf, 0x80, 0x3d, 0xf7, 0xef) #define BCACHEFS_STATFS_MAGIC BCACHEFS_SUPER_MAGIC #define JSET_MAGIC __cpu_to_le64(0x245235c1a3625032ULL) #define BSET_MAGIC __cpu_to_le64(0x90135c78b99e07f5ULL) static inline __le64 __bch2_sb_magic(struct bch_sb *sb) { __le64 ret; memcpy(&ret, &sb->uuid, sizeof(ret)); return ret; } static inline __u64 __jset_magic(struct bch_sb *sb) { return __le64_to_cpu(__bch2_sb_magic(sb) ^ JSET_MAGIC); } static inline __u64 __bset_magic(struct bch_sb *sb) { return __le64_to_cpu(__bch2_sb_magic(sb) ^ BSET_MAGIC); } /* Journal */ #define JSET_KEYS_U64s (sizeof(struct jset_entry) / sizeof(__u64)) #define BCH_JSET_ENTRY_TYPES() \ x(btree_keys, 0) \ x(btree_root, 1) \ x(prio_ptrs, 2) \ x(blacklist, 3) \ x(blacklist_v2, 4) \ x(usage, 5) \ x(data_usage, 6) \ x(clock, 7) \ x(dev_usage, 8) \ x(log, 9) \ x(overwrite, 10) \ x(write_buffer_keys, 11) \ x(datetime, 12) enum bch_jset_entry_type { #define x(f, nr) BCH_JSET_ENTRY_##f = nr, BCH_JSET_ENTRY_TYPES() #undef x BCH_JSET_ENTRY_NR }; static inline bool jset_entry_is_key(struct jset_entry *e) { switch (e->type) { case BCH_JSET_ENTRY_btree_keys: case BCH_JSET_ENTRY_btree_root: case BCH_JSET_ENTRY_write_buffer_keys: return true; } return false; } /* * Journal sequence numbers can be blacklisted: bsets record the max sequence * number of all the journal entries they contain updates for, so that on * recovery we can ignore those bsets that contain index updates newer that what * made it into the journal. * * This means that we can't reuse that journal_seq - we have to skip it, and * then record that we skipped it so that the next time we crash and recover we * don't think there was a missing journal entry. */ struct jset_entry_blacklist { struct jset_entry entry; __le64 seq; }; struct jset_entry_blacklist_v2 { struct jset_entry entry; __le64 start; __le64 end; }; #define BCH_FS_USAGE_TYPES() \ x(reserved, 0) \ x(inodes, 1) \ x(key_version, 2) enum bch_fs_usage_type { #define x(f, nr) BCH_FS_USAGE_##f = nr, BCH_FS_USAGE_TYPES() #undef x BCH_FS_USAGE_NR }; struct jset_entry_usage { struct jset_entry entry; __le64 v; } __packed; struct jset_entry_data_usage { struct jset_entry entry; __le64 v; struct bch_replicas_entry_v1 r; } __packed; struct jset_entry_clock { struct jset_entry entry; __u8 rw; __u8 pad[7]; __le64 time; } __packed; struct jset_entry_dev_usage_type { __le64 buckets; __le64 sectors; __le64 fragmented; } __packed; struct jset_entry_dev_usage { struct jset_entry entry; __le32 dev; __u32 pad; __le64 _buckets_ec; /* No longer used */ __le64 _buckets_unavailable; /* No longer used */ struct jset_entry_dev_usage_type d[]; }; static inline unsigned jset_entry_dev_usage_nr_types(struct jset_entry_dev_usage *u) { return (vstruct_bytes(&u->entry) - sizeof(struct jset_entry_dev_usage)) / sizeof(struct jset_entry_dev_usage_type); } struct jset_entry_log { struct jset_entry entry; u8 d[]; } __packed __aligned(8); struct jset_entry_datetime { struct jset_entry entry; __le64 seconds; } __packed __aligned(8); /* * On disk format for a journal entry: * seq is monotonically increasing; every journal entry has its own unique * sequence number. * * last_seq is the oldest journal entry that still has keys the btree hasn't * flushed to disk yet. * * version is for on disk format changes. */ struct jset { struct bch_csum csum; __le64 magic; __le64 seq; __le32 version; __le32 flags; __le32 u64s; /* size of d[] in u64s */ __u8 encrypted_start[0]; __le16 _read_clock; /* no longer used */ __le16 _write_clock; /* Sequence number of oldest dirty journal entry */ __le64 last_seq; struct jset_entry start[0]; __u64 _data[]; } __packed __aligned(8); LE32_BITMASK(JSET_CSUM_TYPE, struct jset, flags, 0, 4); LE32_BITMASK(JSET_BIG_ENDIAN, struct jset, flags, 4, 5); LE32_BITMASK(JSET_NO_FLUSH, struct jset, flags, 5, 6); #define BCH_JOURNAL_BUCKETS_MIN 8 /* Btree: */ enum btree_id_flags { BTREE_ID_EXTENTS = BIT(0), BTREE_ID_SNAPSHOTS = BIT(1), BTREE_ID_SNAPSHOT_FIELD = BIT(2), BTREE_ID_DATA = BIT(3), }; #define BCH_BTREE_IDS() \ x(extents, 0, BTREE_ID_EXTENTS|BTREE_ID_SNAPSHOTS|BTREE_ID_DATA,\ BIT_ULL(KEY_TYPE_whiteout)| \ BIT_ULL(KEY_TYPE_error)| \ BIT_ULL(KEY_TYPE_cookie)| \ BIT_ULL(KEY_TYPE_extent)| \ BIT_ULL(KEY_TYPE_reservation)| \ BIT_ULL(KEY_TYPE_reflink_p)| \ BIT_ULL(KEY_TYPE_inline_data)) \ x(inodes, 1, BTREE_ID_SNAPSHOTS, \ BIT_ULL(KEY_TYPE_whiteout)| \ BIT_ULL(KEY_TYPE_inode)| \ BIT_ULL(KEY_TYPE_inode_v2)| \ BIT_ULL(KEY_TYPE_inode_v3)| \ BIT_ULL(KEY_TYPE_inode_generation)) \ x(dirents, 2, BTREE_ID_SNAPSHOTS, \ BIT_ULL(KEY_TYPE_whiteout)| \ BIT_ULL(KEY_TYPE_hash_whiteout)| \ BIT_ULL(KEY_TYPE_dirent)) \ x(xattrs, 3, BTREE_ID_SNAPSHOTS, \ BIT_ULL(KEY_TYPE_whiteout)| \ BIT_ULL(KEY_TYPE_cookie)| \ BIT_ULL(KEY_TYPE_hash_whiteout)| \ BIT_ULL(KEY_TYPE_xattr)) \ x(alloc, 4, 0, \ BIT_ULL(KEY_TYPE_alloc)| \ BIT_ULL(KEY_TYPE_alloc_v2)| \ BIT_ULL(KEY_TYPE_alloc_v3)| \ BIT_ULL(KEY_TYPE_alloc_v4)) \ x(quotas, 5, 0, \ BIT_ULL(KEY_TYPE_quota)) \ x(stripes, 6, 0, \ BIT_ULL(KEY_TYPE_stripe)) \ x(reflink, 7, BTREE_ID_EXTENTS|BTREE_ID_DATA, \ BIT_ULL(KEY_TYPE_reflink_v)| \ BIT_ULL(KEY_TYPE_indirect_inline_data)| \ BIT_ULL(KEY_TYPE_error)) \ x(subvolumes, 8, 0, \ BIT_ULL(KEY_TYPE_subvolume)) \ x(snapshots, 9, 0, \ BIT_ULL(KEY_TYPE_snapshot)) \ x(lru, 10, 0, \ BIT_ULL(KEY_TYPE_set)) \ x(freespace, 11, BTREE_ID_EXTENTS, \ BIT_ULL(KEY_TYPE_set)) \ x(need_discard, 12, 0, \ BIT_ULL(KEY_TYPE_set)) \ x(backpointers, 13, 0, \ BIT_ULL(KEY_TYPE_backpointer)) \ x(bucket_gens, 14, 0, \ BIT_ULL(KEY_TYPE_bucket_gens)) \ x(snapshot_trees, 15, 0, \ BIT_ULL(KEY_TYPE_snapshot_tree)) \ x(deleted_inodes, 16, BTREE_ID_SNAPSHOT_FIELD, \ BIT_ULL(KEY_TYPE_set)) \ x(logged_ops, 17, 0, \ BIT_ULL(KEY_TYPE_logged_op_truncate)| \ BIT_ULL(KEY_TYPE_logged_op_finsert)) \ x(rebalance_work, 18, BTREE_ID_SNAPSHOT_FIELD, \ BIT_ULL(KEY_TYPE_set)|BIT_ULL(KEY_TYPE_cookie)) \ x(subvolume_children, 19, 0, \ BIT_ULL(KEY_TYPE_set)) \ x(accounting, 20, BTREE_ID_SNAPSHOT_FIELD, \ BIT_ULL(KEY_TYPE_accounting)) \ enum btree_id { #define x(name, nr, ...) BTREE_ID_##name = nr, BCH_BTREE_IDS() #undef x BTREE_ID_NR }; /* * Maximum number of btrees that we will _ever_ have under the current scheme, * where we refer to them with 64 bit bitfields - and we also need a bit for * the interior btree node type: */ #define BTREE_ID_NR_MAX 63 static inline bool btree_id_is_alloc(enum btree_id id) { switch (id) { case BTREE_ID_alloc: case BTREE_ID_backpointers: case BTREE_ID_need_discard: case BTREE_ID_freespace: case BTREE_ID_bucket_gens: return true; default: return false; } } #define BTREE_MAX_DEPTH 4U /* Btree nodes */ /* * Btree nodes * * On disk a btree node is a list/log of these; within each set the keys are * sorted */ struct bset { __le64 seq; /* * Highest journal entry this bset contains keys for. * If on recovery we don't see that journal entry, this bset is ignored: * this allows us to preserve the order of all index updates after a * crash, since the journal records a total order of all index updates * and anything that didn't make it to the journal doesn't get used. */ __le64 journal_seq; __le32 flags; __le16 version; __le16 u64s; /* count of d[] in u64s */ struct bkey_packed start[0]; __u64 _data[]; } __packed __aligned(8); LE32_BITMASK(BSET_CSUM_TYPE, struct bset, flags, 0, 4); LE32_BITMASK(BSET_BIG_ENDIAN, struct bset, flags, 4, 5); LE32_BITMASK(BSET_SEPARATE_WHITEOUTS, struct bset, flags, 5, 6); /* Sector offset within the btree node: */ LE32_BITMASK(BSET_OFFSET, struct bset, flags, 16, 32); struct btree_node { struct bch_csum csum; __le64 magic; /* this flags field is encrypted, unlike bset->flags: */ __le64 flags; /* Closed interval: */ struct bpos min_key; struct bpos max_key; struct bch_extent_ptr _ptr; /* not used anymore */ struct bkey_format format; union { struct bset keys; struct { __u8 pad[22]; __le16 u64s; __u64 _data[0]; }; }; } __packed __aligned(8); LE64_BITMASK(BTREE_NODE_ID_LO, struct btree_node, flags, 0, 4); LE64_BITMASK(BTREE_NODE_LEVEL, struct btree_node, flags, 4, 8); LE64_BITMASK(BTREE_NODE_NEW_EXTENT_OVERWRITE, struct btree_node, flags, 8, 9); LE64_BITMASK(BTREE_NODE_ID_HI, struct btree_node, flags, 9, 25); /* 25-32 unused */ LE64_BITMASK(BTREE_NODE_SEQ, struct btree_node, flags, 32, 64); static inline __u64 BTREE_NODE_ID(struct btree_node *n) { return BTREE_NODE_ID_LO(n) | (BTREE_NODE_ID_HI(n) << 4); } static inline void SET_BTREE_NODE_ID(struct btree_node *n, __u64 v) { SET_BTREE_NODE_ID_LO(n, v); SET_BTREE_NODE_ID_HI(n, v >> 4); } struct btree_node_entry { struct bch_csum csum; union { struct bset keys; struct { __u8 pad[22]; __le16 u64s; __u64 _data[0]; }; }; } __packed __aligned(8); #endif /* _BCACHEFS_FORMAT_H */
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