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dm thin: 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 thin-pool status if it is
set in the thinp metadata.

Also, update thinp documentation.

Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Mike Snitzer 2015-07-15 11:40:24 -04:00
parent bcc696fac1
commit e4c78e210d
2 changed files with 16 additions and 3 deletions
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9
Documentation/device-mapper/thin-provisioning.txt
View File

@ -296,7 +296,7 @@ ii) Status
underlying device. When this is enabled when loading the table,
it can get disabled if the underlying device doesn't support it.
ro|rw
ro|rw|out_of_data_space
If the pool encounters certain types of device failures it will
drop into a read-only metadata mode in which no changes to
the pool metadata (like allocating new blocks) are permitted.
@ -314,6 +314,13 @@ ii) Status
module parameter can be used to change this timeout -- it
defaults to 60 seconds but may be disabled using a value of 0.
needs_check
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
thin-pool can be made fully operational again. '-' indicates
needs_check is not set.
iii) Messages
create_thin <dev id>

10
drivers/md/dm-thin.c
View File

@ -3738,6 +3738,7 @@ static void emit_flags(struct pool_features *pf, char *result,
* Status line is:
* <transaction id> <used metadata sectors>/<total metadata sectors>
* <used data sectors>/<total data sectors> <held metadata root>
* <pool mode> <discard config> <no space config> <needs_check>
*/
static void pool_status(struct dm_target *ti, status_type_t type,
unsigned status_flags, char *result, unsigned maxlen)
@ -3839,6 +3840,11 @@ static void pool_status(struct dm_target *ti, status_type_t type,
else
DMEMIT("queue_if_no_space ");
if (dm_pool_metadata_needs_check(pool->pmd))
DMEMIT("needs_check ");
else
DMEMIT("- ");
break;
case STATUSTYPE_TABLE:
@ -3942,7 +3948,7 @@ static struct target_type pool_target = {
.name = "thin-pool",
.features = DM_TARGET_SINGLETON | DM_TARGET_ALWAYS_WRITEABLE |
DM_TARGET_IMMUTABLE,
.version = {1, 15, 0},
.version = {1, 16, 0},
.module = THIS_MODULE,
.ctr = pool_ctr,
.dtr = pool_dtr,
@ -4329,7 +4335,7 @@ static void thin_io_hints(struct dm_target *ti, struct queue_limits *limits)
static struct target_type thin_target = {
.name = "thin",
.version = {1, 15, 0},
.version = {1, 16, 0},
.module = THIS_MODULE,
.ctr = thin_ctr,
.dtr = thin_dtr,