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bcache: Pull on disk data structures out into a separate header

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Now, the on disk data structures are in a header that can be exported to
userspace - and having them all centralized is nice too.

Signed-off-by: Kent Overstreet <kmo@daterainc.com>
This commit is contained in:
Kent Overstreet 2013-10-31 15:46:42 -07:00
parent 2599b53b7b
commit 81ab4190ac
10 changed files with 387 additions and 340 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

244
drivers/md/bcache/bcache.h
View File

@ -177,6 +177,7 @@
#define pr_fmt(fmt) "bcache: %s() " fmt "\n", __func__
#include <linux/bcache.h>
#include <linux/bio.h>
#include <linux/kobject.h>
#include <linux/list.h>
@ -210,168 +211,6 @@ BITMASK(GC_MARK, struct bucket, gc_mark, 0, 2);
#define GC_MARK_METADATA 2
BITMASK(GC_SECTORS_USED, struct bucket, gc_mark, 2, 14);
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);
#include "journal.h"
#include "stats.h"
struct search;
@ -868,12 +707,6 @@ static inline bool key_merging_disabled(struct cache_set *c)
#endif
}
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;
}
struct bbio {
unsigned submit_time_us;
union {
@ -927,59 +760,6 @@ static inline unsigned local_clock_us(void)
#define prio_buckets(c) \
DIV_ROUND_UP((size_t) (c)->sb.nbuckets, prios_per_bucket(c))
#define JSET_MAGIC 0x245235c1a3625032ULL
#define PSET_MAGIC 0x6750e15f87337f91ULL
#define BSET_MAGIC 0x90135c78b99e07f5ULL
#define jset_magic(c) ((c)->sb.set_magic ^ JSET_MAGIC)
#define pset_magic(c) ((c)->sb.set_magic ^ PSET_MAGIC)
#define bset_magic(c) ((c)->sb.set_magic ^ BSET_MAGIC)
/* Bkey fields: all units are in sectors */
#define KEY_FIELD(name, field, offset, size) \
BITMASK(name, struct bkey, field, offset, size)
#define PTR_FIELD(name, offset, size) \
static inline uint64_t name(const struct bkey *k, unsigned i) \
{ return (k->ptr[i] >> offset) & ~(((uint64_t) ~0) << size); } \
\
static inline void SET_##name(struct bkey *k, unsigned i, uint64_t v)\
{ \
k->ptr[i] &= ~(~((uint64_t) ~0 << size) << offset); \
k->ptr[i] |= v << offset; \
}
KEY_FIELD(KEY_PTRS, high, 60, 3)
KEY_FIELD(HEADER_SIZE, high, 58, 2)
KEY_FIELD(KEY_CSUM, high, 56, 2)
KEY_FIELD(KEY_PINNED, high, 55, 1)
KEY_FIELD(KEY_DIRTY, high, 36, 1)
KEY_FIELD(KEY_SIZE, high, 20, 16)
KEY_FIELD(KEY_INODE, high, 0, 20)
/* Next time I change the on disk format, KEY_OFFSET() won't be 64 bits */
static inline uint64_t KEY_OFFSET(const struct bkey *k)
{
return k->low;
}
static inline void SET_KEY_OFFSET(struct bkey *k, uint64_t v)
{
k->low = v;
}
PTR_FIELD(PTR_DEV, 51, 12)
PTR_FIELD(PTR_OFFSET, 8, 43)
PTR_FIELD(PTR_GEN, 0, 8)
#define PTR_CHECK_DEV ((1 << 12) - 1)
#define PTR(gen, offset, dev) \
((((uint64_t) dev) << 51) | ((uint64_t) offset) << 8 | gen)
static inline size_t sector_to_bucket(struct cache_set *c, sector_t s)
{
return s >> c->bucket_bits;
@ -1018,31 +798,11 @@ static inline struct bucket *PTR_BUCKET(struct cache_set *c,
/* Btree key macros */
/*
* The high bit being set is a relic from when we used it to do binary
* searches - it told you where a key started. It's not used anymore,
* and can probably be safely dropped.
*/
#define KEY(dev, sector, len) \
((struct bkey) { \
.high = (1ULL << 63) | ((uint64_t) (len) << 20) | (dev), \
.low = (sector) \
})
static inline void bkey_init(struct bkey *k)
{
*k = KEY(0, 0, 0);
*k = ZERO_KEY;
}
#define KEY_START(k) (KEY_OFFSET(k) - KEY_SIZE(k))
#define START_KEY(k) KEY(KEY_INODE(k), KEY_START(k), 0)
#define MAX_KEY_INODE (~(~0 << 20))
#define MAX_KEY_OFFSET (((uint64_t) ~0) >> 1)
#define MAX_KEY KEY(MAX_KEY_INODE, MAX_KEY_OFFSET, 0)
#define ZERO_KEY KEY(0, 0, 0)
/*
* This is used for various on disk data structures - cache_sb, prio_set, bset,
* jset: The checksum is _always_ the first 8 bytes of these structs

4
drivers/md/bcache/bset.c
View File

@ -684,7 +684,7 @@ void bch_bset_init_next(struct btree *b)
} else
get_random_bytes(&i->seq, sizeof(uint64_t));
i->magic = bset_magic(b->c);
i->magic = bset_magic(&b->c->sb);
i->version = 0;
i->keys = 0;
@ -1034,7 +1034,7 @@ static void __btree_sort(struct btree *b, struct btree_iter *iter,
* memcpy()
*/
out->magic = bset_magic(b->c);
out->magic = bset_magic(&b->c->sb);
out->seq = b->sets[0].data->seq;
out->version = b->sets[0].data->version;
swap(out, b->sets[0].data);

31
drivers/md/bcache/bset.h
View File

@ -193,37 +193,6 @@ static __always_inline int64_t bkey_cmp(const struct bkey *l,
: (int64_t) KEY_OFFSET(l) - (int64_t) KEY_OFFSET(r);
}
static inline size_t bkey_u64s(const struct bkey *k)
{
BUG_ON(KEY_CSUM(k) > 1);
return 2 + KEY_PTRS(k) + (KEY_CSUM(k) ? 1 : 0);
}
static inline size_t bkey_bytes(const struct bkey *k)
{
return bkey_u64s(k) * sizeof(uint64_t);
}
static inline void bkey_copy(struct bkey *dest, const struct bkey *src)
{
memcpy(dest, src, bkey_bytes(src));
}
static inline void bkey_copy_key(struct bkey *dest, const struct bkey *src)
{
if (!src)
src = &KEY(0, 0, 0);
SET_KEY_INODE(dest, KEY_INODE(src));
SET_KEY_OFFSET(dest, KEY_OFFSET(src));
}
static inline struct bkey *bkey_next(const struct bkey *k)
{
uint64_t *d = (void *) k;
return (struct bkey *) (d + bkey_u64s(k));
}
/* Keylists */
struct keylist {

2
drivers/md/bcache/btree.c
View File

@ -231,7 +231,7 @@ static void bch_btree_node_read_done(struct btree *b)
goto err;
err = "bad magic";
if (i->magic != bset_magic(b->c))
if (i->magic != bset_magic(&b->c->sb))
goto err;
err = "bad checksum";

4
drivers/md/bcache/journal.c
View File

@ -74,7 +74,7 @@ reread: left = ca->sb.bucket_size - offset;
struct list_head *where;
size_t blocks, bytes = set_bytes(j);
if (j->magic != jset_magic(ca->set))
if (j->magic != jset_magic(&ca->sb))
return ret;
if (bytes > left << 9)
@ -596,7 +596,7 @@ static void journal_write_unlocked(struct closure *cl)
for_each_cache(ca, c, i)
w->data->prio_bucket[ca->sb.nr_this_dev] = ca->prio_buckets[0];
w->data->magic = jset_magic(c);
w->data->magic = jset_magic(&c->sb);
w->data->version = BCACHE_JSET_VERSION;
w->data->last_seq = last_seq(&c->journal);
w->data->csum = csum_set(w->data);

37
drivers/md/bcache/journal.h
View File

@ -75,43 +75,6 @@
* nodes that are pinning the oldest journal entries first.
*/
#define BCACHE_JSET_VERSION_UUIDv1 1
/* Always latest UUID format */
#define BCACHE_JSET_VERSION_UUID 1
#define BCACHE_JSET_VERSION 1
/*
* 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 {
uint64_t csum;
uint64_t magic;
uint64_t seq;
uint32_t version;
uint32_t keys;
uint64_t last_seq;
BKEY_PADDED(uuid_bucket);
BKEY_PADDED(btree_root);
uint16_t btree_level;
uint16_t pad[3];
uint64_t prio_bucket[MAX_CACHES_PER_SET];
union {
struct bkey start[0];
uint64_t d[0];
};
};
/*
* Only used for holding the journal entries we read in btree_journal_read()
* during cache_registration

9
drivers/md/bcache/request.c
View File

@ -264,16 +264,17 @@ static void bch_data_invalidate(struct closure *cl)
bio_sectors(bio), (uint64_t) bio->bi_sector);
while (bio_sectors(bio)) {
unsigned len = min(bio_sectors(bio), 1U << 14);
unsigned sectors = min(bio_sectors(bio),
1U << (KEY_SIZE_BITS - 1));
if (bch_keylist_realloc(&op->insert_keys, 0, op->c))
goto out;
bio->bi_sector += len;
bio->bi_size -= len << 9;
bio->bi_sector += sectors;
bio->bi_size -= sectors << 9;
bch_keylist_add(&op->insert_keys,
&KEY(op->inode, bio->bi_sector, len));
&KEY(op->inode, bio->bi_sector, sectors));
}
op->insert_data_done = true;

13
drivers/md/bcache/super.c
View File

@ -45,15 +45,6 @@ const char * const bch_cache_modes[] = {
NULL
};
struct uuid_entry_v0 {
uint8_t uuid[16];
uint8_t label[32];
uint32_t first_reg;
uint32_t last_reg;
uint32_t invalidated;
uint32_t pad;
};
static struct kobject *bcache_kobj;
struct mutex bch_register_lock;
LIST_HEAD(bch_cache_sets);
@ -562,7 +553,7 @@ void bch_prio_write(struct cache *ca)
}
p->next_bucket = ca->prio_buckets[i + 1];
p->magic = pset_magic(ca);
p->magic = pset_magic(&ca->sb);
p->csum = bch_crc64(&p->magic, bucket_bytes(ca) - 8);
bucket = bch_bucket_alloc(ca, WATERMARK_PRIO, true);
@ -613,7 +604,7 @@ static void prio_read(struct cache *ca, uint64_t bucket)
if (p->csum != bch_crc64(&p->magic, bucket_bytes(ca) - 8))
pr_warn("bad csum reading priorities");
if (p->magic != pset_magic(ca))
if (p->magic != pset_magic(&ca->sb))
pr_warn("bad magic reading priorities");
bucket = p->next_bucket;

10
drivers/md/bcache/util.h
View File

@ -27,16 +27,6 @@ struct closure;
#endif
#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; \
}
#define DECLARE_HEAP(type, name) \
struct { \
size_t size, used; \

373
include/uapi/linux/bcache.h Normal file
View File

@ -0,0 +1,373 @@
#ifndef _LINUX_BCACHE_H
#define _LINUX_BCACHE_H
/*
* Bcache on disk data structures
*/
#include <asm/types.h>
#define BITMASK(name, type, field, offset, size) \
static inline __u64 name(const type *k) \
{ return (k->field >> offset) & ~(~0ULL << size); } \
\
static inline void SET_##name(type *k, __u64 v) \
{ \
k->field &= ~(~(~0ULL << size) << offset); \
k->field |= (v & ~(~0ULL << size)) << offset; \
}
/* Btree keys - all units are in sectors */
struct bkey {
__u64 high;
__u64 low;
__u64 ptr[];
};
#define KEY_FIELD(name, field, offset, size) \
BITMASK(name, struct bkey, field, offset, size)
#define PTR_FIELD(name, offset, size) \
static inline __u64 name(const struct bkey *k, unsigned i) \
{ return (k->ptr[i] >> offset) & ~(~0ULL << size); } \
\
static inline void SET_##name(struct bkey *k, unsigned i, __u64 v) \
{ \
k->ptr[i] &= ~(~(~0ULL << size) << offset); \
k->ptr[i] |= (v & ~(~0ULL << size)) << offset; \
}
#define KEY_SIZE_BITS 16
KEY_FIELD(KEY_PTRS, high, 60, 3)
KEY_FIELD(HEADER_SIZE, high, 58, 2)
KEY_FIELD(KEY_CSUM, high, 56, 2)
KEY_FIELD(KEY_PINNED, high, 55, 1)
KEY_FIELD(KEY_DIRTY, high, 36, 1)
KEY_FIELD(KEY_SIZE, high, 20, KEY_SIZE_BITS)
KEY_FIELD(KEY_INODE, high, 0, 20)
/* Next time I change the on disk format, KEY_OFFSET() won't be 64 bits */
static inline __u64 KEY_OFFSET(const struct bkey *k)
{
return k->low;
}
static inline void SET_KEY_OFFSET(struct bkey *k, __u64 v)
{
k->low = v;
}
/*
* The high bit being set is a relic from when we used it to do binary
* searches - it told you where a key started. It's not used anymore,
* and can probably be safely dropped.
*/
#define KEY(inode, offset, size) \
((struct bkey) { \
.high = (1ULL << 63) | ((__u64) (size) << 20) | (inode), \
.low = (offset) \
})
#define ZERO_KEY KEY(0, 0, 0)
#define MAX_KEY_INODE (~(~0 << 20))
#define MAX_KEY_OFFSET (~0ULL >> 1)
#define MAX_KEY KEY(MAX_KEY_INODE, MAX_KEY_OFFSET, 0)
#define KEY_START(k) (KEY_OFFSET(k) - KEY_SIZE(k))
#define START_KEY(k) KEY(KEY_INODE(k), KEY_START(k), 0)
#define PTR_DEV_BITS 12
PTR_FIELD(PTR_DEV, 51, PTR_DEV_BITS)
PTR_FIELD(PTR_OFFSET, 8, 43)
PTR_FIELD(PTR_GEN, 0, 8)
#define PTR_CHECK_DEV ((1 << PTR_DEV_BITS) - 1)
#define PTR(gen, offset, dev) \
((((__u64) dev) << 51) | ((__u64) offset) << 8 | gen)
/* Bkey utility code */
static inline unsigned long bkey_u64s(const struct bkey *k)
{
return (sizeof(struct bkey) / sizeof(__u64)) + KEY_PTRS(k);
}
static inline unsigned long bkey_bytes(const struct bkey *k)
{
return bkey_u64s(k) * sizeof(__u64);
}
#define bkey_copy(_dest, _src) memcpy(_dest, _src, bkey_bytes(_src))
static inline void bkey_copy_key(struct bkey *dest, const struct bkey *src)
{
SET_KEY_INODE(dest, KEY_INODE(src));
SET_KEY_OFFSET(dest, KEY_OFFSET(src));
}
static inline struct bkey *bkey_next(const struct bkey *k)
{
__u64 *d = (void *) k;
return (struct bkey *) (d + bkey_u64s(k));
}
static inline struct bkey *bkey_last(const struct bkey *k, unsigned nr_keys)
{
__u64 *d = (void *) k;
return (struct bkey *) (d + nr_keys);
}
/* Enough for a key with 6 pointers */
#define BKEY_PAD 8
#define BKEY_PADDED(key) \
union { struct bkey key; __u64 key ## _pad[BKEY_PAD]; }
/* Superblock */
/* 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 {
__u64 csum;
__u64 offset; /* sector where this sb was written */
__u64 version;
__u8 magic[16];
__u8 uuid[16];
union {
__u8 set_uuid[16];
__u64 set_magic;
};
__u8 label[SB_LABEL_SIZE];
__u64 flags;
__u64 seq;
__u64 pad[8];
union {
struct {
/* Cache devices */
__u64 nbuckets; /* device size */
__u16 block_size; /* sectors */
__u16 bucket_size; /* sectors */
__u16 nr_in_set;
__u16 nr_this_dev;
};
struct {
/* Backing devices */
__u64 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
*/
};
};
__u32 last_mount; /* time_t */
__u16 first_bucket;
union {
__u16 njournal_buckets;
__u16 keys;
};
__u64 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(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
/*
* 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 JSET_MAGIC 0x245235c1a3625032ULL
#define PSET_MAGIC 0x6750e15f87337f91ULL
#define BSET_MAGIC 0x90135c78b99e07f5ULL
static inline __u64 jset_magic(struct cache_sb *sb)
{
return sb->set_magic ^ JSET_MAGIC;
}
static inline __u64 pset_magic(struct cache_sb *sb)
{
return sb->set_magic ^ PSET_MAGIC;
}
static inline __u64 bset_magic(struct cache_sb *sb)
{
return sb->set_magic ^ BSET_MAGIC;
}
/*
* Journal
*
* 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.
*/
#define BCACHE_JSET_VERSION_UUIDv1 1
#define BCACHE_JSET_VERSION_UUID 1 /* Always latest UUID format */
#define BCACHE_JSET_VERSION 1
struct jset {
__u64 csum;
__u64 magic;
__u64 seq;
__u32 version;
__u32 keys;
__u64 last_seq;
BKEY_PADDED(uuid_bucket);
BKEY_PADDED(btree_root);
__u16 btree_level;
__u16 pad[3];
__u64 prio_bucket[MAX_CACHES_PER_SET];
union {
struct bkey start[0];
__u64 d[0];
};
};
/* Bucket prios/gens */
struct prio_set {
__u64 csum;
__u64 magic;
__u64 seq;
__u32 version;
__u32 pad;
__u64 next_bucket;
struct bucket_disk {
__u16 prio;
__u8 gen;
} __attribute((packed)) data[];
};
/* UUIDS - per backing device/flash only volume metadata */
struct uuid_entry {
union {
struct {
__u8 uuid[16];
__u8 label[32];
__u32 first_reg;
__u32 last_reg;
__u32 invalidated;
__u32 flags;
/* Size of flash only volumes */
__u64 sectors;
};
__u8 pad[128];
};
};
BITMASK(UUID_FLASH_ONLY, struct uuid_entry, flags, 0, 1);
/* Btree nodes */
/* Version 1: Seed pointer into btree node checksum
*/
#define BCACHE_BSET_CSUM 1
#define BCACHE_BSET_VERSION 1
/*
* Btree nodes
*
* On disk a btree node is a list/log of these; within each set the keys are
* sorted
*/
struct bset {
__u64 csum;
__u64 magic;
__u64 seq;
__u32 version;
__u32 keys;
union {
struct bkey start[0];
__u64 d[0];
};
};
/* OBSOLETE */
/* UUIDS - per backing device/flash only volume metadata */
struct uuid_entry_v0 {
__u8 uuid[16];
__u8 label[32];
__u32 first_reg;
__u32 last_reg;
__u32 invalidated;
__u32 pad;
};
#endif /* _LINUX_BCACHE_H */