diff options
Diffstat (limited to 'bcache.h')
| -rw-r--r-- | bcache.h | 137 |
1 files changed, 21 insertions, 116 deletions
@@ -7,124 +7,29 @@ #ifndef _BCACHE_H #define _BCACHE_H -#define BITMASK(name, type, field, offset, size) \ -static inline uint64_t name(const type *k) \ -{ return (k->field >> offset) & ~(((uint64_t) ~0) << size); } \ - \ -static inline void SET_##name(type *k, uint64_t v) \ -{ \ - k->field &= ~(~((uint64_t) ~0 << size) << offset); \ - k->field |= v << offset; \ -} +#include <linux/bcache.h> -static const char bcache_magic[] = { - 0xc6, 0x85, 0x73, 0xf6, 0x4e, 0x1a, 0x45, 0xca, - 0x82, 0x65, 0xf5, 0x7f, 0x48, 0xba, 0x6d, 0x81 }; - -/* - * 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_V0 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_VERSION_CDEV 5 -#define BCACHE_SB_MAX_VERSION 5 - -#define SB_SECTOR 8 -#define SB_LABEL_SIZE 32 -#define SB_JOURNAL_BUCKETS 256U -#define BDEV_DATA_START_DEFAULT 16 /* sectors */ #define SB_START (SB_SECTOR * 512) -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 */ -}; - -static inline bool SB_IS_BDEV(const struct cache_sb *sb) -{ - return sb->version == BCACHE_SB_VERSION_BDEV - || sb->version == BCACHE_SB_VERSION_BDEV_WITH_OFFSET; -} - -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(CACHE_TIER, struct cache_sb, flags, 2, 5); -#define CACHE_TIERS 4U - -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 - -uint64_t crc64(const void *_data, size_t len); - -#define node(i, j) ((void *) ((i)->d + (j))) -#define end(i) node(i, (i)->keys) - -#define csum_set(i) \ - crc64(((void *) (i)) + 8, ((void *) end(i)) - (((void *) (i)) + 8)) +extern const char * const cache_state[]; +extern const char * const replacement_policies[]; +extern const char * const csum_types[]; +extern const char * const bdev_cache_mode[]; +extern const char * const bdev_state[]; + +ssize_t read_string_list(const char *, const char * const[]); +ssize_t read_string_list_or_die(const char *, const char * const[], + const char *); +void print_string_list(const char * const[], size_t); + +uint64_t bch_checksum(unsigned, const void *, size_t); + +#define csum_set(i, type) \ +({ \ + void *start = ((void *) (i)) + sizeof(uint64_t); \ + void *end = bset_bkey_last(i); \ + \ + bch_checksum(type, start, end - start); \ +}) #endif |