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Fix offsets, cache and backing are two different cases.

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This commit is contained in:
Gabriel 2013-03-09 15:51:17 +01:00
parent 865a3b1f0b
commit 3b6ae63e49
3 changed files with 23 additions and 13 deletions
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26
bcache-super-show.c
View File

@ -97,12 +97,12 @@ int main(int argc, char **argv)
printf("sb.version\t\t%" PRIu64, sb.version);
switch (sb.version) {
case 1:
printf(" [backing device]\n");
case 0:
printf(" [cache device]\n");
break;
case 2:
printf(" [cache device]\n");
case CACHE_BACKING_DEV: // 1
printf(" [backing device]\n");
break;
case 3:
@ -125,15 +125,23 @@ int main(int argc, char **argv)
"dev.sectors_per_block\t%u\n"
"dev.sectors_per_bucket\t%u\n"
"dev.bucket_count\t%ju\n"
"dev.cache_count\t\t%u\n" // expect version == 2 ? 1 : 0
"dev.data.first_bucket\t%u\n",
"dev.cache_count\t\t%u\n", // expect version == 0 ? 1 : 0
sb.block_size,
sb.bucket_size,
sb.nbuckets,
sb.nr_this_dev,
sb.first_bucket);
sb.nr_this_dev);
printf("dev.data.first_sector\t%u\n", sb.bucket_size * sb.first_bucket);
if (sb.version == 0) {
printf(
"dev.cache.first_bucket\t%u\n"
"dev.cache.first_sector\t%u\n",
sb.first_bucket,
sb.bucket_size * sb.first_bucket);
} else if (sb.version == CACHE_BACKING_DEV) {
printf(
"dev.data.first_sector\t%u\n",
BDEV_DATA_START);
}
putchar('\n');
uuid_unparse(sb.set_uuid, uuid);

2
bcache.h
View File

@ -25,6 +25,8 @@ static const char bcache_magic[] = {
#define SB_SECTOR 8
#define SB_LABEL_SIZE 32
#define BDEV_DATA_START 16 /* sectors */
struct cache_sb {
uint64_t csum;

8
make-bcache.c
View File

@ -154,7 +154,7 @@ const char * const cache_replacement_policies[] = {
int writeback;
int discard;
unsigned cache_replacement_policy;
uint64_t data_offset = 16;
uint64_t data_offset = BDEV_DATA_START;
struct option opts[] = {
{ "cache", 0, NULL, 'C' },
@ -194,7 +194,7 @@ void write_sb(char *dev, struct cache_sb *sb)
if (SB_BDEV(sb)) {
SET_BDEV_WRITEBACK(sb, writeback);
if (data_offset != 16) {
if (data_offset != BDEV_DATA_START) {
sb->version = BCACHE_SB_BDEV_VERSION;
sb->keys = 1;
sb->d[0] = data_offset;
@ -288,8 +288,8 @@ int main(int argc, char **argv)
break;
case 'o':
data_offset = atoll(optarg);
if (sb.d[0] < 16) {
printf("Bad data offset; minimum 16 sectors\n");
if (sb.d[0] < BDEV_DATA_START) {
printf("Bad data offset; minimum %d sectors\n", BDEV_DATA_START);
exit(EXIT_FAILURE);
}
break;