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-rw-r--r--Documentation/device-mapper/cache.txt3
1 files changed, 3 insertions, 0 deletions
diff --git a/Documentation/device-mapper/cache.txt b/Documentation/device-mapper/cache.txt
index ff0841711fd5..8ae1cf8e94da 100644
--- a/Documentation/device-mapper/cache.txt
+++ b/Documentation/device-mapper/cache.txt
@@ -206,6 +206,9 @@ Optional feature arguments are:
in a separate btree, which improves speed of shutting
down the cache.
+ no_discard_passdown : disable passing down discards from the cache
+ to the origin's data device.
+
A policy called 'default' is always registered. This is an alias for
the policy we currently think is giving best all round performance.