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set btree_node_size for the cache_sb based on bucket_size

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Change-Id: I98dab6e9a221cd8781095039d653ace84ffae806
Signed-off-by: Jacob Malevich <jam@daterainc.com>
This commit is contained in:
Jacob Malevich 2014-10-13 15:21:09 -07:00
parent e8c1cee578
commit ee44c4f509
1 changed files with 26 additions and 2 deletions
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26
bcache.c
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@ -530,12 +530,34 @@ int dev_open(const char *dev, bool wipe_bcache)
return fd; return fd;
} }
static unsigned min_bucket_size(int num_bucket_sizes, unsigned *bucket_sizes)
{
int i;
unsigned min = bucket_sizes[0];
for (i = 0; i < num_bucket_sizes; i++)
min = bucket_sizes[i] < min ? bucket_sizes[i] : min;
return min;
}
static unsigned node_size(unsigned bucket_size) {
if (bucket_size <= 256)
return bucket_size;
else if (bucket_size <= 512)
return bucket_size / 2;
else
return bucket_size / 4;
}
void write_cache_sbs(int *fds, struct cache_sb *sb, void write_cache_sbs(int *fds, struct cache_sb *sb,
unsigned block_size, unsigned *bucket_sizes, unsigned block_size, unsigned *bucket_sizes,
int num_bucket_sizes) int num_bucket_sizes)
{ {
char uuid_str[40], set_uuid_str[40]; char uuid_str[40], set_uuid_str[40];
size_t i; size_t i;
unsigned min_size = min_bucket_size(num_bucket_sizes, bucket_sizes);
sb->offset = SB_SECTOR; sb->offset = SB_SECTOR;
sb->version = BCACHE_SB_VERSION_CDEV_V3; sb->version = BCACHE_SB_VERSION_CDEV_V3;
@ -552,11 +574,13 @@ void write_cache_sbs(int *fds, struct cache_sb *sb,
for (i = 0; i < sb->nr_in_set; i++) { for (i = 0; i < sb->nr_in_set; i++) {
struct cache_member *m = sb->members + i; struct cache_member *m = sb->members + i;
sb->uuid = m->uuid;
if (num_bucket_sizes <= 1) if (num_bucket_sizes <= 1)
sb->bucket_size = bucket_sizes[0]; sb->bucket_size = bucket_sizes[0];
else else
sb->bucket_size = bucket_sizes[i]; sb->bucket_size = bucket_sizes[i];
SET_CACHE_BTREE_NODE_SIZE(sb, node_size(min_size));
sb->uuid = m->uuid;
sb->nbuckets = getblocks(fds[i]) / sb->bucket_size; sb->nbuckets = getblocks(fds[i]) / sb->bucket_size;
sb->nr_this_dev = i; sb->nr_this_dev = i;
sb->first_bucket = (23 / sb->bucket_size) + 1; sb->first_bucket = (23 / sb->bucket_size) + 1;