From 2e68c4e6caad9fdadc1cef8b6cb9569192e8a42b Mon Sep 17 00:00:00 2001 From: Mike Snitzer Date: Wed, 15 Jan 2014 21:06:55 -0500 Subject: [PATCH] dm cache: add policy name to status output The cache's policy may have been established using the "default" alias, which is currently the "mq" policy but the default policy may change in the future. It is useful to know exactly which policy is being used. Add a 'real' member to the dm_cache_policy_type structure and have the "default" dm_cache_policy_type point to the real "mq" dm_cache_policy_type. Update dm_cache_policy_get_name() to check if real is set, if so report the name of the real policy (not the alias). Requested-by: Jonathan Brassow Signed-off-by: Mike Snitzer --- Documentation/device-mapper/cache.txt | 3 ++- drivers/md/dm-cache-policy-mq.c | 3 ++- drivers/md/dm-cache-policy.c | 4 ++++ drivers/md/dm-cache-policy.h | 6 ++++++ drivers/md/dm-cache-target.c | 4 +++- 5 files changed, 17 insertions(+), 3 deletions(-) diff --git a/Documentation/device-mapper/cache.txt b/Documentation/device-mapper/cache.txt index 63fd7cfa4cf1..e6b72d355151 100644 --- a/Documentation/device-mapper/cache.txt +++ b/Documentation/device-mapper/cache.txt @@ -221,7 +221,7 @@ Status <#used cache blocks>/<#total cache blocks> <#read hits> <#read misses> <#write hits> <#write misses> <#demotions> <#promotions> <#dirty> <#features> * -<#core args> * <#policy args> * +<#core args> * <#policy args> * metadata block size : Fixed block size for each metadata block in sectors @@ -250,6 +250,7 @@ feature args : 'writethrough' (optional) #core args : Number of core arguments (must be even) core args : Key/value pairs for tuning the core e.g. migration_threshold +policy name : Name of the policy #policy args : Number of policy arguments to follow (must be even) policy args : Key/value pairs e.g. sequential_threshold diff --git a/drivers/md/dm-cache-policy-mq.c b/drivers/md/dm-cache-policy-mq.c index e63e36cefc89..930e8c3d73e9 100644 --- a/drivers/md/dm-cache-policy-mq.c +++ b/drivers/md/dm-cache-policy-mq.c @@ -1276,7 +1276,8 @@ static struct dm_cache_policy_type default_policy_type = { .version = {1, 2, 0}, .hint_size = 4, .owner = THIS_MODULE, - .create = mq_create + .create = mq_create, + .real = &mq_policy_type }; static int __init mq_init(void) diff --git a/drivers/md/dm-cache-policy.c b/drivers/md/dm-cache-policy.c index d80057968407..c1a3cee99b44 100644 --- a/drivers/md/dm-cache-policy.c +++ b/drivers/md/dm-cache-policy.c @@ -146,6 +146,10 @@ const char *dm_cache_policy_get_name(struct dm_cache_policy *p) { struct dm_cache_policy_type *t = p->private; + /* if t->real is set then an alias was used (e.g. "default") */ + if (t->real) + return t->real->name; + return t->name; } EXPORT_SYMBOL_GPL(dm_cache_policy_get_name); diff --git a/drivers/md/dm-cache-policy.h b/drivers/md/dm-cache-policy.h index 052c00a84a5c..f50fe360c546 100644 --- a/drivers/md/dm-cache-policy.h +++ b/drivers/md/dm-cache-policy.h @@ -222,6 +222,12 @@ struct dm_cache_policy_type { char name[CACHE_POLICY_NAME_SIZE]; unsigned version[CACHE_POLICY_VERSION_SIZE]; + /* + * For use by an alias dm_cache_policy_type to point to the + * real dm_cache_policy_type. + */ + struct dm_cache_policy_type *real; + /* * Policies may store a hint for each each cache block. * Currently the size of this hint must be 0 or 4 bytes but we diff --git a/drivers/md/dm-cache-target.c b/drivers/md/dm-cache-target.c index 11ad70540d40..09334c275c79 100644 --- a/drivers/md/dm-cache-target.c +++ b/drivers/md/dm-cache-target.c @@ -2832,7 +2832,7 @@ static void cache_resume(struct dm_target *ti) * <#demotions> <#promotions> <#dirty> * <#features> * * <#core args> - * <#policy args> * + * <#policy args> * */ static void cache_status(struct dm_target *ti, status_type_t type, unsigned status_flags, char *result, unsigned maxlen) @@ -2900,6 +2900,8 @@ static void cache_status(struct dm_target *ti, status_type_t type, } DMEMIT("2 migration_threshold %llu ", (unsigned long long) cache->migration_threshold); + + DMEMIT("%s ", dm_cache_policy_get_name(cache->policy)); if (sz < maxlen) { r = policy_emit_config_values(cache->policy, result + sz, maxlen - sz); if (r)