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devmapper: Fail to start container if xfs_nospace_max_retries can't be enforced

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We just introduced a new tunable dm.xfs_nospace_max_retries. But this tunable
will work only on new kernels where xfs supports this feature. On older
kernels xfs does not allow tuning this behavior.

There are two issues. First one is that if xfsSetNospaceRetries() fails,
it returns error but leaves the device activated and mounted. We should
be unmounting the device and deactivate it before returning.
 
Second issue is, if docker is started on older kernel, with
dm.xfs_nospace_max_retries specified, then docker will silently ignore the
fact that /sys file to tweak this behavior is not present and will continue.
But I think it might be better to fail container creation/start if kernel
does not support this feature.

This patch fixes it. After this patch, user will get an error like following
when container is run.

# docker run -ti fedora bash
docker: Error response from daemon: devmapper: user specified daemon option dm.xfs_nospace_max_retries but it does not seem to be supported on this system :open /sys/fs/xfs/dm-5/error/metadata/ENOSPC/max_retries: no such file or directory.

Signed-off-by: Vivek Goyal <vgoyal@redhat.com>
This commit is contained in:
Vivek Goyal 2016-09-07 14:03:01 -04:00
parent e73e37f112
commit 6cc55dd65b
1 changed files with 3 additions and 5 deletions
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8
daemon/graphdriver/devmapper/deviceset.go
View file

@ -2325,11 +2325,7 @@ func (devices *DeviceSet) xfsSetNospaceRetries(info *devInfo) error {
filePath := "/sys/fs/xfs/" + dmDeviceName + "/error/metadata/ENOSPC/max_retries"
maxRetriesFile, err := os.OpenFile(filePath, os.O_WRONLY, 0)
if err != nil {
// Older kernels don't have this feature/file
if os.IsNotExist(err) {
return nil
}
return fmt.Errorf("devmapper: Failed to open file %v:%v", filePath, err)
return fmt.Errorf("devmapper: user specified daemon option dm.xfs_nospace_max_retries but it does not seem to be supported on this system :%v", err)
}
defer maxRetriesFile.Close()
@ -2383,6 +2379,8 @@ func (devices *DeviceSet) MountDevice(hash, path, mountLabel string) error {
if fstype == "xfs" && devices.xfsNospaceRetries != "" {
if err := devices.xfsSetNospaceRetries(info); err != nil {
syscall.Unmount(path, syscall.MNT_DETACH)
devices.deactivateDevice(info)
return err
}
}