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Update for new superblock version for data_offset

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This commit is contained in:
Kent Overstreet 2013-04-11 16:56:15 -07:00
parent 335ac31ba5
commit 3088f201ed
2 changed files with 104 additions and 68 deletions
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40
bcache.h
View File

@ -15,24 +15,27 @@ static const char bcache_magic[] = {
0xc6, 0x85, 0x73, 0xf6, 0x4e, 0x1a, 0x45, 0xca,
0x82, 0x65, 0xf5, 0x7f, 0x48, 0xba, 0x6d, 0x81 };
/* Version 1: Backing dev
/*
* Version 0: Cache device
* Version 1: Backing device
* Version 2: Seed pointer into btree node checksum
* Version 3: Backing dev superblock has offset of start of data
* Version 3: Cache device with new UUID format
* Version 4: Backing device with data offset
*/
#define BCACHE_SB_BDEV_VERSION 3
#define BCACHE_SB_MAX_VERSION 3
#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_LABEL_SIZE 32
#define BDEV_DATA_START 16 /* sectors */
#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;
#define CACHE_BACKING_DEV 1
uint8_t magic[16];
@ -47,17 +50,36 @@ struct cache_sb {
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;
uint16_t keys; /* number of journal buckets */
union {
uint16_t njournal_buckets;
uint16_t keys;
};
uint64_t d[]; /* journal buckets */
};

70
make-bcache.c
View File

@ -161,39 +161,49 @@ static void write_sb(char *dev, unsigned block_size, unsigned bucket_size,
char uuid_str[40], set_uuid_str[40];
struct cache_sb sb;
memset(&sb, 0, sizeof(struct cache_sb));
sb.version = bdev ? CACHE_BACKING_DEV : 0;
sb.bucket_size = bucket_size;
sb.block_size = block_size;
uuid_generate(sb.uuid);
memcpy(sb.set_uuid, set_uuid, sizeof(sb.set_uuid));
if (SB_BDEV(&sb)) {
SET_BDEV_WRITEBACK(&sb, writeback);
if (data_offset != BDEV_DATA_START) {
sb.version = BCACHE_SB_BDEV_VERSION;
sb.keys = 1;
sb.d[0] = data_offset;
}
} else {
SET_CACHE_DISCARD(&sb, discard);
SET_CACHE_REPLACEMENT(&sb, cache_replacement_policy);
}
if ((fd = open(dev, O_RDWR|O_EXCL)) == -1) {
printf("Can't open dev %s: %s\n", dev, strerror(errno));
exit(EXIT_FAILURE);
}
memset(&sb, 0, sizeof(struct cache_sb));
sb.offset = SB_SECTOR;
sb.version = bdev
? BCACHE_SB_VERSION_BDEV
: BCACHE_SB_VERSION_CDEV;
memcpy(sb.magic, bcache_magic, 16);
uuid_generate(sb.uuid);
memcpy(sb.set_uuid, set_uuid, sizeof(sb.set_uuid));
sb.bucket_size = bucket_size;
sb.block_size = block_size;
uuid_unparse(sb.uuid, uuid_str);
uuid_unparse(sb.set_uuid, set_uuid_str);
if (SB_BDEV(&sb)) {
SET_BDEV_WRITEBACK(&sb, writeback);
if (data_offset != BDEV_DATA_START_DEFAULT) {
sb.version = BCACHE_SB_VERSION_BDEV_WITH_OFFSET;
sb.data_offset = data_offset;
}
printf("UUID: %s\n"
"Set UUID: %s\n"
"version: %u\n"
"block_size: %u\n"
"data_offset: %ju\n",
uuid_str, set_uuid_str,
(unsigned) sb.version,
sb.block_size,
sb.data_offset);
} else {
sb.nbuckets = getblocks(fd) / sb.bucket_size;
sb.nr_in_set = 1;
sb.first_bucket = (23 / sb.bucket_size) + 1;
sb.csum = csum_set(&sb);
if (sb.nbuckets < 1 << 7) {
printf("Not enough buckets: %ju, need %u\n",
@ -201,8 +211,8 @@ static void write_sb(char *dev, unsigned block_size, unsigned bucket_size,
exit(EXIT_FAILURE);
}
uuid_unparse(sb.uuid, uuid_str);
uuid_unparse(sb.set_uuid, set_uuid_str);
SET_CACHE_DISCARD(&sb, discard);
SET_CACHE_REPLACEMENT(&sb, cache_replacement_policy);
printf("UUID: %s\n"
"Set UUID: %s\n"
@ -221,6 +231,9 @@ static void write_sb(char *dev, unsigned block_size, unsigned bucket_size,
sb.nr_in_set,
sb.nr_this_dev,
sb.first_bucket);
}
sb.csum = csum_set(&sb);
if (pwrite(fd, &sb, sizeof(sb), SB_SECTOR << 9) != sizeof(sb)) {
perror("write error\n");
@ -241,7 +254,7 @@ int main(int argc, char **argv)
unsigned block_size = 1, bucket_size = 1024;
int writeback = 0, discard = 0;
unsigned cache_replacement_policy = 0;
uint64_t data_offset = BDEV_DATA_START;
uint64_t data_offset = BDEV_DATA_START_DEFAULT;
uuid_t set_uuid;
uuid_generate(set_uuid);
@ -289,8 +302,9 @@ int main(int argc, char **argv)
break;
case 'o':
data_offset = atoll(optarg);
if (data_offset < BDEV_DATA_START) {
printf("Bad data offset; minimum %d sectors\n", BDEV_DATA_START);
if (data_offset < BDEV_DATA_START_DEFAULT) {
printf("Bad data offset; minimum %d sectors\n",
BDEV_DATA_START_DEFAULT);
exit(EXIT_FAILURE);
}
break;