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authorMike Snitzer <snitzer@redhat.com>2014-01-09 16:04:12 -0500
committerMike Snitzer <snitzer@redhat.com>2014-01-10 10:24:33 -0500
commit6a388618f120cdc70cd6b6dbcab5f7a4aff500f6 (patch)
tree6d71f28ac277c7dead29f10fc3bf7ada336a0c9d /drivers/md/dm-cache-target.c
parentf164e6900f2be2c29f5c11ca52af5bb824f40826 (diff)
downloadop-kernel-dev-6a388618f120cdc70cd6b6dbcab5f7a4aff500f6.zip
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dm cache: add block sizes and total cache blocks to status output
Improve cache_status to emit: <metadata block size> <#used metadata blocks>/<#total metadata blocks> <cache block size> <#used cache blocks>/<#total cache blocks> ... Adding the block sizes allows for easier calculation of the overall size of both the metadata and cache devices. Adding <#total cache blocks> provides useful context for how much of the cache is used. Unfortunately these additions to the status will require updates to users' scripts that monitor the cache status. But these changes help provide more comprehensive information about the cache device and will simplify tools that are being developed to manage dm-cache devices -- because they won't need to issue 3 operations to cobble together the information that we can easily provide via a single status ioctl. While updating the status documentation in cache.txt spaces were tabify'd. Requested-by: Jonathan Brassow <jbrassow@redhat.com> Signed-off-by: Mike Snitzer <snitzer@redhat.com> Acked-by: Joe Thornber <ejt@redhat.com>
Diffstat (limited to 'drivers/md/dm-cache-target.c')
-rw-r--r--drivers/md/dm-cache-target.c16
1 files changed, 10 insertions, 6 deletions
diff --git a/drivers/md/dm-cache-target.c b/drivers/md/dm-cache-target.c
index 1b1469e..11ad705 100644
--- a/drivers/md/dm-cache-target.c
+++ b/drivers/md/dm-cache-target.c
@@ -2826,9 +2826,10 @@ static void cache_resume(struct dm_target *ti)
/*
* Status format:
*
- * <#used metadata blocks>/<#total metadata blocks>
+ * <metadata block size> <#used metadata blocks>/<#total metadata blocks>
+ * <cache block size> <#used cache blocks>/<#total cache blocks>
* <#read hits> <#read misses> <#write hits> <#write misses>
- * <#demotions> <#promotions> <#blocks in cache> <#dirty>
+ * <#demotions> <#promotions> <#dirty>
* <#features> <features>*
* <#core args> <core args>
* <#policy args> <policy args>*
@@ -2869,17 +2870,20 @@ static void cache_status(struct dm_target *ti, status_type_t type,
residency = policy_residency(cache->policy);
- DMEMIT("%llu/%llu %u %u %u %u %u %u %llu %u ",
+ DMEMIT("%u %llu/%llu %u %llu/%llu %u %u %u %u %u %u %llu ",
+ (unsigned)(DM_CACHE_METADATA_BLOCK_SIZE >> SECTOR_SHIFT),
(unsigned long long)(nr_blocks_metadata - nr_free_blocks_metadata),
(unsigned long long)nr_blocks_metadata,
+ cache->sectors_per_block,
+ (unsigned long long) from_cblock(residency),
+ (unsigned long long) from_cblock(cache->cache_size),
(unsigned) atomic_read(&cache->stats.read_hit),
(unsigned) atomic_read(&cache->stats.read_miss),
(unsigned) atomic_read(&cache->stats.write_hit),
(unsigned) atomic_read(&cache->stats.write_miss),
(unsigned) atomic_read(&cache->stats.demotion),
(unsigned) atomic_read(&cache->stats.promotion),
- (unsigned long long) from_cblock(residency),
- cache->nr_dirty);
+ (unsigned long long) from_cblock(cache->nr_dirty));
if (writethrough_mode(&cache->features))
DMEMIT("1 writethrough ");
@@ -3129,7 +3133,7 @@ static void cache_io_hints(struct dm_target *ti, struct queue_limits *limits)
static struct target_type cache_target = {
.name = "cache",
- .version = {1, 2, 0},
+ .version = {1, 3, 0},
.module = THIS_MODULE,
.ctr = cache_ctr,
.dtr = cache_dtr,
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