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devmapper: udev sync on init

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when initializing the devmapper driver, attempt to sync udev and device
mapper. If udev sync is not supported, print a warning. Eventually we'll
likely bail here to avoid unpredictable behavior for users.

Signed-off-by: Vincent Batts <vbatts@redhat.com>
Upstream-commit: 022e1232f84966c4b70a612bc35463ebb58e3137
Component: engine
This commit is contained in:
Vincent Batts
2015-01-19 15:11:40 -05:00
parent b3b9656da1
commit e54a5327c8
1 changed files with 6 additions and 0 deletions
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6
components/engine/daemon/graphdriver/devmapper/deviceset.go
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@ -947,6 +947,12 @@ func (devices *DeviceSet) initDevmapper(doInit bool) error {
return graphdriver.ErrNotSupported
}
// https://github.com/docker/docker/issues/4036
if supported := devicemapper.UdevSetSyncSupport(true); !supported {
log.Warnf("WARNING: Udev sync is not supported. This will lead to unexpected behavior, data loss and errors")
}
log.Debugf("devicemapper: udev sync support: %v", devicemapper.UdevSyncSupported())
if err := os.MkdirAll(devices.metadataDir(), 0700); err != nil && !os.IsExist(err) {
return err
}