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dm cache: display 'needs_check' in status if it is set

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There is currently no way to see that the needs_check flag has been set
in the metadata.  Display 'needs_check' in the cache status if it is set
in the cache metadata.

Also, update cache documentation.

Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Mike Snitzer 2015-07-15 11:42:59 -04:00
parent e4c78e210d
commit 255eac2005
2 changed files with 13 additions and 2 deletions
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6
Documentation/device-mapper/cache.txt
View file

@ -258,6 +258,12 @@ cache metadata mode : ro if read-only, rw if read-write
no further I/O will be permitted and the status will just no further I/O will be permitted and the status will just
contain the string 'Fail'. The userspace recovery tools contain the string 'Fail'. The userspace recovery tools
should then be used. should then be used.
needs_check : 'needs_check' if set, '-' if not set
A metadata operation has failed, resulting in the needs_check
flag being set in the metadata's superblock. The metadata
device must be deactivated and checked/repaired before the
cache can be made fully operational again. '-' indicates
needs_check is not set.
Messages Messages
-------- --------

9
drivers/md/dm-cache-target.c
View file

@ -3496,7 +3496,7 @@ static void cache_resume(struct dm_target *ti)
* <#demotions> <#promotions> <#dirty> * <#demotions> <#promotions> <#dirty>
* <#features> <features>* * <#features> <features>*
* <#core args> <core args> * <#core args> <core args>
* <policy name> <#policy args> <policy args>* <cache metadata mode> * <policy name> <#policy args> <policy args>* <cache metadata mode> <needs_check>
*/ */
static void cache_status(struct dm_target *ti, status_type_t type, static void cache_status(struct dm_target *ti, status_type_t type,
unsigned status_flags, char *result, unsigned maxlen) unsigned status_flags, char *result, unsigned maxlen)
@ -3582,6 +3582,11 @@ static void cache_status(struct dm_target *ti, status_type_t type,
else else
DMEMIT("rw "); DMEMIT("rw ");
if (dm_cache_metadata_needs_check(cache->cmd))
DMEMIT("needs_check ");
else
DMEMIT("- ");
break; break;
case STATUSTYPE_TABLE: case STATUSTYPE_TABLE:
@ -3820,7 +3825,7 @@ static void cache_io_hints(struct dm_target *ti, struct queue_limits *limits)
static struct target_type cache_target = { static struct target_type cache_target = {
.name = "cache", .name = "cache",
.version = {1, 7, 0}, .version = {1, 8, 0},
.module = THIS_MODULE, .module = THIS_MODULE,
.ctr = cache_ctr, .ctr = cache_ctr,
.dtr = cache_dtr, .dtr = cache_dtr,