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dm cache metadata: add "metadata2" feature

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If "metadata2" is provided as a table argument when creating/loading a
cache target a more compact metadata format, with separate dirty bits,
is used.  "metadata2" improves speed of shutting down a cache target.

Signed-off-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Joe Thornber 2016-09-22 06:15:21 -04:00 • committed by Mike Snitzer
parent ae4a46a1f6
commit 629d0a8a1a
4 changed files with 278 additions and 53 deletions
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38
drivers/md/dm-cache-target.c
View file

@ -179,6 +179,7 @@ enum cache_io_mode {
struct cache_features {
enum cache_metadata_mode mode;
enum cache_io_mode io_mode;
unsigned metadata_version;
};
struct cache_stats {
@ -2541,13 +2542,14 @@ static void init_features(struct cache_features *cf)
{
cf->mode = CM_WRITE;
cf->io_mode = CM_IO_WRITEBACK;
cf->metadata_version = 1;
}
static int parse_features(struct cache_args *ca, struct dm_arg_set *as,
char **error)
{
static struct dm_arg _args[] = {
{0, 1, "Invalid number of cache feature arguments"},
{0, 2, "Invalid number of cache feature arguments"},
};
int r;
@ -2573,6 +2575,9 @@ static int parse_features(struct cache_args *ca, struct dm_arg_set *as,
else if (!strcasecmp(arg, "passthrough"))
cf->io_mode = CM_IO_PASSTHROUGH;
else if (!strcasecmp(arg, "metadata2"))
cf->metadata_version = 2;
else {
*error = "Unrecognised cache feature requested";
return -EINVAL;
@ -2827,7 +2832,8 @@ static int cache_create(struct cache_args *ca, struct cache **result)
cmd = dm_cache_metadata_open(cache->metadata_dev->bdev,
ca->block_size, may_format,
dm_cache_policy_get_hint_size(cache->policy));
dm_cache_policy_get_hint_size(cache->policy),
ca->features.metadata_version);
if (IS_ERR(cmd)) {
*error = "Error creating metadata object";
r = PTR_ERR(cmd);
@ -3172,21 +3178,16 @@ static int cache_end_io(struct dm_target *ti, struct bio *bio, int error)
static int write_dirty_bitset(struct cache *cache)
{
unsigned i, r;
int r;
if (get_cache_mode(cache) >= CM_READ_ONLY)
return -EINVAL;
for (i = 0; i < from_cblock(cache->cache_size); i++) {
r = dm_cache_set_dirty(cache->cmd, to_cblock(i),
is_dirty(cache, to_cblock(i)));
if (r) {
metadata_operation_failed(cache, "dm_cache_set_dirty", r);
return r;
}
}
r = dm_cache_set_dirty_bits(cache->cmd, from_cblock(cache->cache_size), cache->dirty_bitset);
if (r)
metadata_operation_failed(cache, "dm_cache_set_dirty_bits", r);
return 0;
return r;
}
static int write_discard_bitset(struct cache *cache)
@ -3562,14 +3563,19 @@ static void cache_status(struct dm_target *ti, status_type_t type,
(unsigned) atomic_read(&cache->stats.promotion),
(unsigned long) atomic_read(&cache->nr_dirty));
if (cache->features.metadata_version == 2)
DMEMIT("2 metadata2 ");
else
DMEMIT("1 ");
if (writethrough_mode(&cache->features))
DMEMIT("1 writethrough ");
DMEMIT("writethrough ");
else if (passthrough_mode(&cache->features))
DMEMIT("1 passthrough ");
DMEMIT("passthrough ");
else if (writeback_mode(&cache->features))
DMEMIT("1 writeback ");
DMEMIT("writeback ");
else {
DMERR("%s: internal error: unknown io mode: %d",
@ -3817,7 +3823,7 @@ static void cache_io_hints(struct dm_target *ti, struct queue_limits *limits)
static struct target_type cache_target = {
.name = "cache",
.version = {1, 9, 0},
.version = {1, 10, 0},
.module = THIS_MODULE,
.ctr = cache_ctr,
.dtr = cache_dtr,