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devmapper: Enable skip_block_zeroing

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This makes the device mapper not zero out blocks allocated on the
thinp device. This is safe in our use case, as we access the device
via a filesystem that doesn't leak any uninitialized data to userspace.

This partially helps with https://github.com/dotcloud/docker/issues/3280
and should generally improve preformance on the devicemapper backend.

Docker-DCO-1.1-Signed-off-by: Alexander Larsson <alexl@redhat.com> (github: alexlarsson)
This commit is contained in:
Alexander Larsson 2014-02-09 07:25:34 +01:00
parent 8228e50581
commit 695719b29a
1 changed files with 1 additions and 1 deletions
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2
graphdriver/devmapper/devmapper.go
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@ -324,7 +324,7 @@ func createPool(poolName string, dataFile, metadataFile *osFile) error {
return fmt.Errorf("Can't get data size")
}
params := metadataFile.Name() + " " + dataFile.Name() + " 128 32768"
params := metadataFile.Name() + " " + dataFile.Name() + " 128 32768 1 skip_block_zeroing"
if err := task.AddTarget(0, size/512, "thin-pool", params); err != nil {
return fmt.Errorf("Can't add target")
}