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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 <[email protected]>
This commit is contained in:
Mike Snitzer 2015-07-15 11:42:59 -04:00
commit 255eac2005
2 changed files with 13 additions and 2 deletions
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6
Documentation/device-mapper/cache.txt
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@ -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
contain the string 'Fail'. The userspace recovery tools
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.
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