-struct bkey {
- uint64_t high;
- uint64_t low;
- uint64_t ptr[];
-};
-
-/* Enough for a key with 6 pointers */
-#define BKEY_PAD 8
-
-#define BKEY_PADDED(key) \
- union { struct bkey key; uint64_t key ## _pad[BKEY_PAD]; }
-
-/* Version 0: Cache device
- * Version 1: Backing device
- * Version 2: Seed pointer into btree node checksum
- * Version 3: Cache device with new UUID format
- * Version 4: Backing device with data offset
- */
-#define BCACHE_SB_VERSION_CDEV 0
-#define BCACHE_SB_VERSION_BDEV 1
-#define BCACHE_SB_VERSION_CDEV_WITH_UUID 3
-#define BCACHE_SB_VERSION_BDEV_WITH_OFFSET 4
-#define BCACHE_SB_MAX_VERSION 4
-
-#define SB_SECTOR 8
-#define SB_SIZE 4096
-#define SB_LABEL_SIZE 32
-#define SB_JOURNAL_BUCKETS 256U
-/* SB_JOURNAL_BUCKETS must be divisible by BITS_PER_LONG */
-#define MAX_CACHES_PER_SET 8
-
-#define BDEV_DATA_START_DEFAULT 16 /* sectors */
-
-struct cache_sb {
- uint64_t csum;
- uint64_t offset; /* sector where this sb was written */
- uint64_t version;
-
- uint8_t magic[16];
-
- uint8_t uuid[16];
- union {
- uint8_t set_uuid[16];
- uint64_t set_magic;
- };
- uint8_t label[SB_LABEL_SIZE];
-
- uint64_t flags;
- uint64_t seq;
- uint64_t pad[8];
-
- union {
- struct {
- /* Cache devices */
- uint64_t nbuckets; /* device size */
-
- uint16_t block_size; /* sectors */
- uint16_t bucket_size; /* sectors */
-
- uint16_t nr_in_set;
- uint16_t nr_this_dev;
- };
- struct {
- /* Backing devices */
- uint64_t data_offset;
-
- /*
- * block_size from the cache device section is still used by
- * backing devices, so don't add anything here until we fix
- * things to not need it for backing devices anymore
- */
- };
- };
-
- uint32_t last_mount; /* time_t */
-
- uint16_t first_bucket;
- union {
- uint16_t njournal_buckets;
- uint16_t keys;
- };
- uint64_t d[SB_JOURNAL_BUCKETS]; /* journal buckets */
-};
-
-BITMASK(CACHE_SYNC, struct cache_sb, flags, 0, 1);
-BITMASK(CACHE_DISCARD, struct cache_sb, flags, 1, 1);
-BITMASK(CACHE_REPLACEMENT, struct cache_sb, flags, 2, 3);
-#define CACHE_REPLACEMENT_LRU 0U
-#define CACHE_REPLACEMENT_FIFO 1U
-#define CACHE_REPLACEMENT_RANDOM 2U
-
-BITMASK(BDEV_CACHE_MODE, struct cache_sb, flags, 0, 4);
-#define CACHE_MODE_WRITETHROUGH 0U
-#define CACHE_MODE_WRITEBACK 1U
-#define CACHE_MODE_WRITEAROUND 2U
-#define CACHE_MODE_NONE 3U
-BITMASK(BDEV_STATE, struct cache_sb, flags, 61, 2);
-#define BDEV_STATE_NONE 0U
-#define BDEV_STATE_CLEAN 1U
-#define BDEV_STATE_DIRTY 2U
-#define BDEV_STATE_STALE 3U
-
-/* Version 1: Seed pointer into btree node checksum
- */
-#define BCACHE_BSET_VERSION 1
-
-/*
- * This is the on disk format for btree nodes - a btree node on disk is a list
- * of these; within each set the keys are sorted
- */
-struct bset {
- uint64_t csum;
- uint64_t magic;
- uint64_t seq;
- uint32_t version;
- uint32_t keys;
-
- union {
- struct bkey start[0];
- uint64_t d[0];
- };
-};
-
-/*
- * On disk format for priorities and gens - see super.c near prio_write() for
- * more.
- */
-struct prio_set {
- uint64_t csum;
- uint64_t magic;
- uint64_t seq;
- uint32_t version;
- uint32_t pad;
-
- uint64_t next_bucket;
-
- struct bucket_disk {
- uint16_t prio;
- uint8_t gen;
- } __attribute((packed)) data[];
-};
-
-struct uuid_entry {
- union {
- struct {
- uint8_t uuid[16];
- uint8_t label[32];
- uint32_t first_reg;
- uint32_t last_reg;
- uint32_t invalidated;
-
- uint32_t flags;
- /* Size of flash only volumes */
- uint64_t sectors;
- };
-
- uint8_t pad[128];
- };
-};
-
-BITMASK(UUID_FLASH_ONLY, struct uuid_entry, flags, 0, 1);
-