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-rw-r--r--Documentation/device-mapper/cache.txt6
1 files changed, 6 insertions, 0 deletions
diff --git a/Documentation/device-mapper/cache.txt b/Documentation/device-mapper/cache.txt
index 82960cffbad3..785eab87aa71 100644
--- a/Documentation/device-mapper/cache.txt
+++ b/Documentation/device-mapper/cache.txt
@@ -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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