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feat(mount): moving to legacy mount

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We can not mount the datasets to more than one path via zfs mount command,
shifting to the legacy way of handling ZFS volumes where we can mount/umount
the datasets via legacy mount and umount commands.

This will also add a building block for SINGLE-NODE-MULTI-WRITER Capability.

Signed-off-by: Pawan <pawan@mayadata.io>
This commit is contained in:
Pawan 2020-06-08 11:33:27 +05:30 • committed by Kiran Mova
parent b08a1e2a1f
commit 639ead416e
3 changed files with 74 additions and 46 deletions
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35
pkg/zfs/zfs_util.go
View file

@ -140,7 +140,7 @@ func buildCloneCreateArgs(vol *apis.ZFSVolume) []string {
reservationProperty := "reservation=" + vol.Spec.Capacity
ZFSVolArg = append(ZFSVolArg, "-o", reservationProperty)
}
ZFSVolArg = append(ZFSVolArg, "-o", "mountpoint=none")
ZFSVolArg = append(ZFSVolArg, "-o", "mountpoint=legacy")
}
if len(vol.Spec.Dedup) != 0 {
@ -235,7 +235,7 @@ func buildDatasetCreateArgs(vol *apis.ZFSVolume) []string {
}
// set the mount path to none, by default zfs mounts it to the default dataset path
ZFSVolArg = append(ZFSVolArg, "-o", "mountpoint=none", volume)
ZFSVolArg = append(ZFSVolArg, "-o", "mountpoint=legacy", volume)
return ZFSVolArg
}
@ -421,25 +421,24 @@ func MountZFSDataset(vol *apis.ZFSVolume, mountpath string) error {
return nil
}
// UmountZFSDataset umounts the dataset
func UmountZFSDataset(vol *apis.ZFSVolume) error {
volume := vol.Spec.PoolName + "/" + vol.Name
var MountVolArg []string
MountVolArg = append(MountVolArg, "umount", volume)
cmd := exec.Command(ZFSVolCmd, MountVolArg...)
out, err := cmd.CombinedOutput()
// SetDatasetLegacyMount sets the dataset mountpoint to legacy if not set
func SetDatasetLegacyMount(vol *apis.ZFSVolume) error {
if vol.Spec.VolumeType != VOLTYPE_DATASET {
return nil
}
prop, err := GetVolumeProperty(vol, "mountpoint")
if err != nil {
logrus.Errorf("zfs: could not umount the dataset %v cmd %v error: %s",
volume, MountVolArg, string(out))
return err
}
// ignoring the failure of setting the mountpoint to none
// as the dataset has already been umounted, now the new pod
// can mount it and it will change that to desired mountpath
// and try to mount it if not mounted
SetDatasetMountProp(volume, "none")
return nil
if prop != "legacy" {
// set the mountpoint to legacy
volume := vol.Spec.PoolName + "/" + vol.Name
err = SetDatasetMountProp(volume, "legacy")
}
return err
}
// GetVolumeProperty gets zfs properties for the volume
@ -454,7 +453,7 @@ func GetVolumeProperty(vol *apis.ZFSVolume, prop string) (string, error) {
if err != nil {
logrus.Errorf("zfs: could not get %s on dataset %v cmd %v error: %s",
prop, volume, ZFSVolArg, string(out))
return "", fmt.Errorf("get %s failed, %s", prop, string(out))
return "", fmt.Errorf("zfs get %s failed, %s", prop, string(out))
}
val := out[:len(out)-1]
return string(val), nil