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Merge pull request #36307 from kolyshkin/dm-misc

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devmapper cleanup improvements
This commit is contained in:
Tõnis Tiigi 2018-03-07 12:57:21 -08:00 committed by GitHub
commit bc7424b443
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GPG key ID: 4AEE18F83AFDEB23
2 changed files with 43 additions and 42 deletions
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72
daemon/graphdriver/devmapper/deviceset.go
View file

@ -2223,6 +2223,38 @@ func (devices *DeviceSet) cancelDeferredRemoval(info *devInfo) error {
return err
}
func (devices *DeviceSet) unmountAndDeactivateAll(dir string) {
files, err := ioutil.ReadDir(dir)
if err != nil {
logrus.Warnf("devmapper: unmountAndDeactivate: %s", err)
return
}
for _, d := range files {
if !d.IsDir() {
continue
}
name := d.Name()
fullname := path.Join(dir, name)
// We use MNT_DETACH here in case it is still busy in some running
// container. This means it'll go away from the global scope directly,
// and the device will be released when that container dies.
if err := unix.Unmount(fullname, unix.MNT_DETACH); err != nil && err != unix.EINVAL {
logrus.Warnf("devmapper: Shutdown unmounting %s, error: %s", fullname, err)
}
if devInfo, err := devices.lookupDevice(name); err != nil {
logrus.Debugf("devmapper: Shutdown lookup device %s, error: %s", name, err)
} else {
if err := devices.deactivateDevice(devInfo); err != nil {
logrus.Debugf("devmapper: Shutdown deactivate %s, error: %s", devInfo.Hash, err)
}
}
}
}
// Shutdown shuts down the device by unmounting the root.
func (devices *DeviceSet) Shutdown(home string) error {
logrus.Debugf("devmapper: [deviceset %s] Shutdown()", devices.devicePrefix)
@ -2244,45 +2276,7 @@ func (devices *DeviceSet) Shutdown(home string) error {
// will be killed and we will not get a chance to save deviceset
// metadata. Hence save this early before trying to deactivate devices.
devices.saveDeviceSetMetaData()
// ignore the error since it's just a best effort to not try to unmount something that's mounted
mounts, _ := mount.GetMounts()
mounted := make(map[string]bool, len(mounts))
for _, mnt := range mounts {
mounted[mnt.Mountpoint] = true
}
if err := filepath.Walk(path.Join(home, "mnt"), func(p string, info os.FileInfo, err error) error {
if err != nil {
return err
}
if !info.IsDir() {
return nil
}
if mounted[p] {
// We use MNT_DETACH here in case it is still busy in some running
// container. This means it'll go away from the global scope directly,
// and the device will be released when that container dies.
if err := unix.Unmount(p, unix.MNT_DETACH); err != nil {
logrus.Debugf("devmapper: Shutdown unmounting %s, error: %s", p, err)
}
}
if devInfo, err := devices.lookupDevice(path.Base(p)); err != nil {
logrus.Debugf("devmapper: Shutdown lookup device %s, error: %s", path.Base(p), err)
} else {
if err := devices.deactivateDevice(devInfo); err != nil {
logrus.Debugf("devmapper: Shutdown deactivate %s , error: %s", devInfo.Hash, err)
}
}
return nil
}); err != nil && !os.IsNotExist(err) {
devices.Unlock()
return err
}
devices.unmountAndDeactivateAll(path.Join(home, "mnt"))
devices.Unlock()
info, _ := devices.lookupDeviceWithLock("")

13
daemon/graphdriver/devmapper/driver.go
View file

@ -16,6 +16,7 @@ import (
"github.com/docker/docker/pkg/locker"
"github.com/docker/docker/pkg/mount"
units "github.com/docker/go-units"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
"golang.org/x/sys/unix"
)
@ -121,12 +122,18 @@ func (d *Driver) GetMetadata(id string) (map[string]string, error) {
// Cleanup unmounts a device.
func (d *Driver) Cleanup() error {
err := d.DeviceSet.Shutdown(d.home)
umountErr := mount.RecursiveUnmount(d.home)
if err2 := mount.RecursiveUnmount(d.home); err == nil {
err = err2
// in case we have two errors, prefer the one from Shutdown()
if err != nil {
return err
}
return err
if umountErr != nil {
return errors.Wrapf(umountErr, "error unmounting %s", d.home)
}
return nil
}
// CreateReadWrite creates a layer that is writable for use as a container