mirror of
https://github.com/koverstreet/bcachefs-tools.git
synced 2025-01-22 00:04:31 +03:00
78 lines
1.8 KiB
C
78 lines
1.8 KiB
C
#ifndef _BCACHE_H
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#define _BCACHE_H
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#define BITMASK(name, type, field, offset, size) \
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static inline uint64_t name(const type *k) \
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{ return (k->field >> offset) & ~(((uint64_t) ~0) << size); } \
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\
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static inline void SET_##name(type *k, uint64_t v) \
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{ \
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k->field &= ~(~((uint64_t) ~0 << size) << offset); \
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k->field |= v << offset; \
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}
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static const char bcache_magic[] = {
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0xc6, 0x85, 0x73, 0xf6, 0x4e, 0x1a, 0x45, 0xca,
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0x82, 0x65, 0xf5, 0x7f, 0x48, 0xba, 0x6d, 0x81 };
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/* Version 1: Backing dev
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* Version 2: Seed pointer into btree node checksum
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* Version 3: Backing dev superblock has offset of start of data
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*/
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#define BCACHE_SB_BDEV_VERSION 3
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#define BCACHE_SB_MAX_VERSION 3
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#define SB_SECTOR 8
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#define SB_LABEL_SIZE 32
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struct cache_sb {
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uint64_t csum;
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uint64_t offset; /* sector where this sb was written */
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uint64_t version;
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#define CACHE_BACKING_DEV 1
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uint8_t magic[16];
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uint8_t uuid[16];
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union {
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uint8_t set_uuid[16];
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uint64_t set_magic;
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};
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uint8_t label[SB_LABEL_SIZE];
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uint64_t flags;
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uint64_t seq;
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uint64_t pad[8];
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uint64_t nbuckets; /* device size */
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uint16_t block_size; /* sectors */
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uint16_t bucket_size; /* sectors */
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uint16_t nr_in_set;
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uint16_t nr_this_dev;
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uint32_t last_mount; /* time_t */
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uint16_t first_bucket;
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uint16_t keys; /* number of journal buckets */
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uint64_t d[]; /* journal buckets */
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};
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BITMASK(SB_BDEV, struct cache_sb, version, 0, 1);
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BITMASK(BDEV_WRITEBACK, struct cache_sb, flags, 0, 1);
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BITMASK(CACHE_DISCARD, struct cache_sb, flags, 1, 1);
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BITMASK(CACHE_REPLACEMENT, struct cache_sb, flags, 2, 3);
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inline uint64_t crc64(const void *_data, size_t len);
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#define node(i, j) ((void *) ((i)->d + (j)))
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#define end(i) node(i, (i)->keys)
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#define csum_set(i) \
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crc64(((void *) (i)) + 8, ((void *) end(i)) - (((void *) (i)) + 8))
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#endif
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