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-rw-r--r--Documentation/device-mapper/cache.txt12
1 files changed, 11 insertions, 1 deletions
diff --git a/Documentation/device-mapper/cache.txt b/Documentation/device-mapper/cache.txt
index ff6639f7253..fc9d2dfb941 100644
--- a/Documentation/device-mapper/cache.txt
+++ b/Documentation/device-mapper/cache.txt
@@ -244,12 +244,22 @@ The message format is:
E.g.
dmsetup message my_cache 0 sequential_threshold 1024
+
+Invalidation is removing an entry from the cache without writing it
+back. Cache blocks can be invalidated via the invalidate_cblocks
+message, which takes an arbitrary number of cblock ranges.
+
+ invalidate_cblocks [<cblock>|<cblock begin>-<cblock end>]*
+
+E.g.
+ dmsetup message my_cache 0 invalidate_cblocks 2345 3456-4567 5678-6789
+
Examples
========
The test suite can be found here:
-https://github.com/jthornber/thinp-test-suite
+https://github.com/jthornber/device-mapper-test-suite
dmsetup create my_cache --table '0 41943040 cache /dev/mapper/metadata \
/dev/mapper/ssd /dev/mapper/origin 512 1 writeback default 0'