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-rw-r--r--Documentation/device-mapper/cache.txt15
1 files changed, 13 insertions, 2 deletions
diff --git a/Documentation/device-mapper/cache.txt b/Documentation/device-mapper/cache.txt
index 68c0f517c..785eab87a 100644
--- a/Documentation/device-mapper/cache.txt
+++ b/Documentation/device-mapper/cache.txt
@@ -221,6 +221,7 @@ Status
<#read hits> <#read misses> <#write hits> <#write misses>
<#demotions> <#promotions> <#dirty> <#features> <features>*
<#core args> <core args>* <policy name> <#policy args> <policy args>*
+<cache metadata mode>
metadata block size : Fixed block size for each metadata block in
sectors
@@ -251,8 +252,18 @@ 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
+policy args : Key/value pairs e.g. sequential_threshold
+cache metadata mode : ro if read-only, rw if read-write
+ In serious cases where even a read-only mode is deemed unsafe
+ 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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