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devmapper: Use transactions during device deletion

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Use transaction logic during device deletion and do rollback if transaction
is not complete. Following is the sequence of events.

- Open transaction and save to metafile
- Delete device from pool
- Delete device metadata file from disk
- Close Transaction

If docker crashes without closing transaction then rollback will take
place upon next docker start.
 
Signed-off-by: Vivek Goyal <vgoyal@redhat.com>
This commit is contained in:
Vivek Goyal 2014-12-03 13:06:43 -05:00 committed by root
parent c115c4aa45
commit 17b75a21a6
1 changed files with 9 additions and 0 deletions
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9
daemon/graphdriver/devmapper/deviceset.go
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@ -1128,6 +1128,11 @@ func (devices *DeviceSet) deleteDevice(info *DevInfo) error {
}
}
if err := devices.openTransaction(info.Hash, info.DeviceId); err != nil {
log.Debugf("Error opening transaction hash = %s deviceId = %d", "", info.DeviceId)
return err
}
if err := devicemapper.DeleteDevice(devices.getPoolDevName(), info.DeviceId); err != nil {
log.Debugf("Error deleting device: %s", err)
return err
@ -1137,6 +1142,10 @@ func (devices *DeviceSet) deleteDevice(info *DevInfo) error {
return err
}
if err := devices.closeTransaction(); err != nil {
return err
}
devices.markDeviceIdFree(info.DeviceId)
return nil