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Ensures files get closed properly. Closes #6213 

Docker-DCO-1.1-Signed-off-by: Tibor Vass <teabee89@gmail.com> (github: tiborvass)
This commit is contained in:
Tibor Vass 2014-06-05 15:13:43 -07:00
parent 0434a2ce64
commit b1ac791d84
2 changed files with 3 additions and 22 deletions
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2
daemon/graphdriver/devmapper/README.md
View File

@ -4,7 +4,7 @@
The device mapper graphdriver uses the device mapper thin provisioning
module (dm-thinp) to implement CoW snapshots. For each devicemapper
graph locaion (typically `/var/lib/docker/devicemapper`, $graph below)
graph location (typically `/var/lib/docker/devicemapper`, $graph below)
a thin pool is created based on two block devices, one for data and
one for metadata. By default these block devices are created
automatically by using loopback mounts of automatically creates sparse

23
daemon/graphdriver/devmapper/deviceset.go
View File

@ -307,7 +307,6 @@ func (devices *DeviceSet) createFilesystem(info *DevInfo) error {
err = fmt.Errorf("Unsupported filesystem type %s", devices.filesystem)
}
if err != nil {
utils.Debugf("\n--->Err: %s\n", err)
return err
}
@ -317,12 +316,10 @@ func (devices *DeviceSet) createFilesystem(info *DevInfo) error {
func (devices *DeviceSet) initMetaData() error {
_, _, _, params, err := getStatus(devices.getPoolName())
if err != nil {
utils.Debugf("\n--->Err: %s\n", err)
return err
}
if _, err := fmt.Sscanf(params, "%d", &devices.TransactionId); err != nil {
utils.Debugf("\n--->Err: %s\n", err)
return err
}
devices.NewTransactionId = devices.TransactionId
@ -331,7 +328,6 @@ func (devices *DeviceSet) initMetaData() error {
jsonData, err := ioutil.ReadFile(devices.oldMetadataFile())
if err != nil && !os.IsNotExist(err) {
utils.Debugf("\n--->Err: %s\n", err)
return err
}
@ -339,7 +335,6 @@ func (devices *DeviceSet) initMetaData() error {
m := MetaData{Devices: make(map[string]*DevInfo)}
if err := json.Unmarshal(jsonData, &m); err != nil {
utils.Debugf("\n--->Err: %s\n", err)
return err
}
@ -389,7 +384,6 @@ func (devices *DeviceSet) setupBaseImage() error {
if oldInfo != nil && !oldInfo.Initialized {
utils.Debugf("Removing uninitialized base image")
if err := devices.deleteDevice(oldInfo); err != nil {
utils.Debugf("\n--->Err: %s\n", err)
return err
}
}
@ -400,7 +394,6 @@ func (devices *DeviceSet) setupBaseImage() error {
// Create initial device
if err := createDevice(devices.getPoolDevName(), &id); err != nil {
utils.Debugf("\n--->Err: %s\n", err)
return err
}
@ -411,26 +404,22 @@ func (devices *DeviceSet) setupBaseImage() error {
info, err := devices.registerDevice(id, "", devices.baseFsSize)
if err != nil {
_ = deleteDevice(devices.getPoolDevName(), id)
utils.Debugf("\n--->Err: %s\n", err)
return err
}
utils.Debugf("Creating filesystem on base device-manager snapshot")
if err = devices.activateDeviceIfNeeded(info); err != nil {
utils.Debugf("\n--->Err: %s\n", err)
return err
}
if err := devices.createFilesystem(info); err != nil {
utils.Debugf("\n--->Err: %s\n", err)
return err
}
info.Initialized = true
if err = devices.saveMetadata(info); err != nil {
info.Initialized = false
utils.Debugf("\n--->Err: %s\n", err)
return err
}
@ -610,16 +599,15 @@ func (devices *DeviceSet) initDevmapper(doInit bool) error {
dataFile, err = attachLoopDevice(data)
if err != nil {
utils.Debugf("\n--->Err: %s\n", err)
return err
}
defer dataFile.Close()
} else {
dataFile, err = os.OpenFile(devices.dataDevice, os.O_RDWR, 0600)
if err != nil {
return err
}
}
defer dataFile.Close()
if devices.metadataDevice == "" {
// Make sure the sparse images exist in <root>/devicemapper/metadata
@ -642,19 +630,17 @@ func (devices *DeviceSet) initDevmapper(doInit bool) error {
metadataFile, err = attachLoopDevice(metadata)
if err != nil {
utils.Debugf("\n--->Err: %s\n", err)
return err
}
defer metadataFile.Close()
} else {
metadataFile, err = os.OpenFile(devices.metadataDevice, os.O_RDWR, 0600)
if err != nil {
return err
}
}
defer metadataFile.Close()
if err := createPool(devices.getPoolName(), dataFile, metadataFile); err != nil {
utils.Debugf("\n--->Err: %s\n", err)
return err
}
}
@ -663,7 +649,6 @@ func (devices *DeviceSet) initDevmapper(doInit bool) error {
// load the transaction id and migrate old metadata
if !createdLoopback {
if err = devices.initMetaData(); err != nil {
utils.Debugf("\n--->Err: %s\n", err)
return err
}
}
@ -775,7 +760,6 @@ func (devices *DeviceSet) deactivatePool() error {
devname := devices.getPoolDevName()
devinfo, err := getInfo(devname)
if err != nil {
utils.Debugf("\n--->Err: %s\n", err)
return err
}
if devinfo.Exists != 0 {
@ -797,12 +781,10 @@ func (devices *DeviceSet) deactivateDevice(info *DevInfo) error {
devinfo, err := getInfo(info.Name())
if err != nil {
utils.Debugf("\n--->Err: %s\n", err)
return err
}
if devinfo.Exists != 0 {
if err := devices.removeDeviceAndWait(info.Name()); err != nil {
utils.Debugf("\n--->Err: %s\n", err)
return err
}
}
@ -1032,7 +1014,6 @@ func (devices *DeviceSet) UnmountDevice(hash string) error {
utils.Debugf("[devmapper] Unmount(%s)", info.mountPath)
if err := syscall.Unmount(info.mountPath, 0); err != nil {
utils.Debugf("\n--->Err: %s\n", err)
return err
}
utils.Debugf("[devmapper] Unmount done")