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Merge pull request #34379 from cpuguy83/mount_optimizations

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Optimizations for recursive unmount
This commit is contained in:
Vincent Demeester 2018-01-24 14:00:58 -08:00 committed by GitHub
commit 59e86068e6
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1 changed files with 24 additions and 10 deletions
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34
pkg/mount/mount.go
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@ -4,6 +4,8 @@ import (
"sort"
"strings"
"syscall"
"github.com/sirupsen/logrus"
)
@ -77,18 +79,30 @@ func RecursiveUnmount(target string) error {
continue
}
logrus.Debugf("Trying to unmount %s", m.Mountpoint)
err = Unmount(m.Mountpoint)
if err != nil && i == len(mounts)-1 {
if mounted, err := Mounted(m.Mountpoint); err != nil || mounted {
return err
err = unmount(m.Mountpoint, mntDetach)
if err != nil {
// If the error is EINVAL either this whole package is wrong (invalid flags passed to unmount(2)) or this is
// not a mountpoint (which is ok in this case).
// Meanwhile calling `Mounted()` is very expensive.
//
// We've purposefully used `syscall.EINVAL` here instead of `unix.EINVAL` to avoid platform branching
// Since `EINVAL` is defined for both Windows and Linux in the `syscall` package (and other platforms),
// this is nicer than defining a custom value that we can refer to in each platform file.
if err == syscall.EINVAL {
continue
}
// Ignore errors for submounts and continue trying to unmount others
// The final unmount should fail if there ane any submounts remaining
} else if err != nil {
logrus.Errorf("Failed to unmount %s: %v", m.Mountpoint, err)
} else if err == nil {
logrus.Debugf("Unmounted %s", m.Mountpoint)
if i == len(mounts)-1 {
if mounted, e := Mounted(m.Mountpoint); e != nil || mounted {
return err
}
continue
}
// This is some submount, we can ignore this error for now, the final unmount will fail if this is a real problem
logrus.WithError(err).Warnf("Failed to unmount submount %s", m.Mountpoint)
continue
}
logrus.Debugf("Unmounted %s", m.Mountpoint)
}
return nil
}