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| author | Joe Thornber <ejt@redhat.com> | 2013-11-08 16:39:50 +0000 |
|---|---|---|
| committer | Mike Snitzer <snitzer@redhat.com> | 2013-11-11 11:37:51 -0500 |
| commit | 65790ff919e2e07ccb4457415c11075b245d643b (patch) | |
| tree | 9e2e0c667cf0fe62d72c1c37514d2535aa52ba5b /Documentation/device-mapper | |
| parent | 532906aa7f9656209f30f08dfadd328fc1bc6912 (diff) | |
| download | lwn-65790ff919e2e07ccb4457415c11075b245d643b.tar.gz lwn-65790ff919e2e07ccb4457415c11075b245d643b.zip | |
dm cache: add cache block invalidation support
Cache block 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
Signed-off-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Diffstat (limited to 'Documentation/device-mapper')
| -rw-r--r-- | Documentation/device-mapper/cache.txt | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/Documentation/device-mapper/cache.txt b/Documentation/device-mapper/cache.txt index ff6639f72536..fc9d2dfb9415 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' |