Revert once our google/fscrypt dependency is upgraded to a version
that includes https://github.com/google/fscrypt/pull/359 gets accepted
Signed-off-by: Marcel Lauhoff <marcel.lauhoff@suse.com>
Use constant protector name 'ceph-csi' instead of constant prefix
concatenated with the volume ID. When cloning volumes the ID changes
and fscrypt protected directories become inunlockable due to the
protector name change
Signed-off-by: Marcel Lauhoff <marcel.lauhoff@suse.com>
NewContextFrom{Mountpoint,Path} functions use cached
`/proc/self/mountinfo` to find mounted file systems by device ID.
Since we run fscrypt as a library in a long-lived process the cached
information is likely to be stale. Stale entries may map device IDs to
mount points of already destroyed RBDs and fail context creation.
Updating the cache beforehand prevents this.
Signed-off-by: Marcel Lauhoff <marcel.lauhoff@suse.com>
Currently fscrypt supports policies version 1 and 2. 2 is the best
choice and was the only choice prior to this commit. This adds support
for kernels < 5.4, by selecting policy version 1 there.
Signed-off-by: Marcel Lauhoff <marcel.lauhoff@suse.com>
Fetch password when keyFn is invoked, not when it is created. This
allows creation of the keyFn before actually creating the passphrase.
Signed-off-by: Marcel Lauhoff <marcel.lauhoff@suse.com>
Fetch keys from KMS before doing anything else. This will catch KMS
errors before setting up any fscrypt metadata.
Signed-off-by: Marcel Lauhoff <marcel.lauhoff@suse.com>
Integrate google/fscrypt into Ceph CSI KMS and encryption setup. Adds
dependencies to google/fscrypt and pkg/xattr. Be as generic as
possible to support integration with both RBD and Ceph FS.
Add the following public functions:
InitializeNode: per-node initialization steps. Must be called
before Unlock at least once.
Unlock: All steps necessary to unlock an encrypted directory including
setting it up initially.
IsDirectoryUnlocked: Test if directory is really encrypted
Signed-off-by: Marcel Lauhoff <marcel.lauhoff@suse.com>
In preparation of fscrypt support for RBD filesystems, rename block
encryption related function to include the word 'block'. Add struct
fields and IsFileEncrypted.
Signed-off-by: Marcel Lauhoff <marcel.lauhoff@suse.com>
Add registry similar to the providers one. This allows testers to
add and use GetKMSTestDummy() to create stripped down provider
instances suitable for use in unit tests.
Signed-off-by: Marcel Lauhoff <marcel.lauhoff@suse.com>
Add GetSecret() to allow direct access to passphrases without KDF and
wrapping by a DEKStore.
This will be used by fscrypt, which has its own KDF and wrapping. It
will allow users to take a k8s secret, for example, and use that
directly as a password in fscrypt.
Signed-off-by: Marcel Lauhoff <marcel.lauhoff@suse.com>
Fetch encryption type from vol options. Make fallback type
configurable to support RBD (default block) and Ceph FS (default file)
Signed-off-by: Marcel Lauhoff <marcel.lauhoff@suse.com>
fscrypt support requires keys longer than 20 bytes. As a preparation,
make the new passphrase length configurable, but default to 20 bytes.
Signed-off-by: Marcel Lauhoff <marcel.lauhoff@suse.com>
The error message return from the GRPC
should be of GRPC error messages only
not the normal go errors. This commits
returns GRPC error if setAllMetadata
fails.
Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>
If any operations fails after the volume creation
we will cleanup the omap objects, but it is missing
if setAllMetadata fails. This commits adds the code
to cleanup the rbd image if metadata operation fails.
Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>
As we need to compare the error type instead
of the error value we need to use errors.As
to check the API is implemented or not.
fixes: #3347
Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>
CephFS does not have a concept of "free inodes", inodes get allocated
on-demand in the filesystem.
This confuses alerting managers that expect a (high) number of free
inodes, and warnings get produced if the number of free inodes is not
high enough. This causes alerts to always get reported for CephFS.
To prevent the false-positive alerts from happening, the
NodeGetVolumeStats procedure for CephFS (and CephNFS) will not contain
inodes in the reply anymore.
See-also: https://bugzilla.redhat.com/2128263
Signed-off-by: Niels de Vos <ndevos@redhat.com>
To address the problem that snapshot
schedules are triggered for volumes
that are promoted, a dummy image was
disabled/enabled for replication.
This was done as a workaround, because the
promote operation was not triggering
the schedules for the image being promoted.
The bugs related to the same have been fixed in
RBD mirroring functionality and hence the
workaround #2656 can be removed from the code base.
ceph tracker https://tracker.ceph.com/issues/53914
Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>
This commit gets the description from remote status
instead of local status.
Local status doesn't have ',' due to which we get
array index out of range panic.
Fixes: #3388
Signed-off-by: Yati Padia <ypadia@redhat.com>
Co-authored-by: shyam Ranganathan <srangana@redhat.com>
This commit implements getVolumeReplicationInfo
to get the last sync time and update it in volume
replication CR.
Signed-off-by: yati1998 <ypadia@redhat.com>
This commit adds blocklist range cmd feature,
while fallbacks to old blocklist one ip at a
time if the cmd is invalid(not available).
Signed-off-by: Rakshith R <rar@redhat.com>
Incase the subvolumegroup is deleted
and recreated we need to restart the
cephcsi provisioner pod to clear cache
that cephcsi maintains. With this PR
if cephcsi sees NotFound error duing
subvolume creation it will reset the cache
for that filesystem so that in next RPC
call cephcsi will try to create the
subvolumegroup again
Ref: https://github.com/rook/rook/issues/10623
Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>
In a cluster we can have multiple filesystem
for that we need to have a map of
subvolumegroups to check filesystem is created
nor not.
Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>
If the image is mirroring enabled
and primary consider it for mapping,
if the image is mirroring enabled but
not primary yet. return error message
until the image is marked as primary.
Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>
If the ceph cluster is of older version and doesnot
support metadata operation, Instead of failing
the request return the success if metadata
operation is not supported.
fixes#3347
Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>
This commit updates csi-addons spec version
and modifies logging to strip replication
request secret using csi.StripSecret, then
with replication.protosanitizer if the former
fails. This is done in order to make sure
we strip csi and replication format of secrets.
Signed-off-by: Rakshith R <rar@redhat.com>
This commit uses %q instead %v in error messages
and adds result reason and message in kmip
verifyresponse().
Signed-off-by: Rakshith R <rar@redhat.com>
This commit fixes a bug in kmip kms Decrypt
function, where emd.DEK was fed in a Nonce
instead of emd.Nonce by mistake.
Signed-off-by: Rakshith R <rar@redhat.com>
The github.com/google/uuid package is used by Kubernetes, and it is part
of the vendor/ directory already. Our usage of github.com/pborman/uuid
can be replaced by github.com/google/uuid, so that
github.com/pborman/uuid can be removed as a dependency.
Closes: #3315
Signed-off-by: Niels de Vos <ndevos@redhat.com>
csi-addons server will advertise replication capability and
replication service will run with csi-addons server too.
Signed-off-by: Rakshith R <rar@redhat.com>
The Key Management Interoperability Protocol (KMIP)
is an extensible communication protocol
that defines message formats for the manipulation
of cryptographic keys on a key management server.
Ceph-CSI can now be configured to connect to
various KMS using KMIP for encrypting RBD volumes.
https://en.wikipedia.org/wiki/Key_Management_Interoperability_Protocol
Signed-off-by: Rakshith R <rar@redhat.com>
getting is unused for linter "staticcheck"
(nolintlint) error message due to wrong
comment format. this the format now with
`//directive // comment`
Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>
This commit cleans up for loop to use index to access
value instead of copying value into a new variable
while iterating.
```
internal/util/csiconfig.go:103:2: rangeValCopy: each \
iteration copies 136 bytes (consider pointers or indexing) \
(gocritic)
for _, cluster := range config {
```
Signed-off-by: Rakshith R <rar@redhat.com>
This commit adds nfs nodeserver capable of
mounting nfs volumes, even with pod networking
using NSenter design similar to rbd and cephfs.
NodePublish, NodeUnpublish, NodeGetVolumeStats
and NodeGetCapabilities have been implemented.
The nodeserver implementation has been inspired
from https://github.com/kubernetes-csi/csi-driver-nfs,
which was previously used for mounted cephcsi exported
nfs volumes. The current implementation is also
backward compatible for the previously created
PVCs.
Signed-off-by: Rakshith R <rar@redhat.com>
Current code uses an !A && !B condition incorrectly to
test A:Up and B:status for a remote peer image.
This should be !A || !B as we require both conditions to
be in the specified state (Up: true, and status Unknown).
This is corrected by this commit, and further fixes:
- check and return ready only when a remote site is
found in the status output
- check if all peer sites are ready, if multiple are found
and return ready appropriately
Signed-off-by: Shyamsundar Ranganathan <srangana@redhat.com>
During ResyncVolume we check if the image
is in an error state, and we resync.
After resync, the image will move to
either the `Error` or the `Resyncing` state.
And if the image is in the above two
conditions, we will return a successful
response and Ready=false so that the
consumer can wait until the volume is
ready to use. If the image is in any
other state we return an error message
to indicate the syncing is not going on.
The whole resync and image state change
depends on the rbd mirror daemon. If the
mirror daemon is not running, the image
can be in Resyncing or Unknown state.
The Ramen marks the volume replication as
secondary, and once the resync starts, it
will delete the volume replication CR as a
cleanup process.
As we dont have a check for the rbd mirror
daemon, we are returning a resync success
response and Ready=false. Due to this false
response Ramen is assuming the resync started
and deleted the volume replication CR, and
because of this, the cluster goes into a bad
state and needs manual intervention.
fixes#3289
Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>
IsNotMountPoint() is deprecated and Mounter.IsMountPoint() is
recommended to be used instead.
Reported-by: golangci/staticcheck
Signed-off-by: Niels de Vos <ndevos@redhat.com>
NewWithoutSystemd() has been introduced in the k8s.io/mount-utils
package so that systemd is not called while executing functions. This
offers consumers the ability to prevent confusing and scary messages
from getting logged.
See-also: kubernetes/kubernetes#111218
Signed-off-by: Niels de Vos <ndevos@redhat.com>
previously, it was a requirement to have attacher sidecar for CSI
drivers and there had an implementation of dummy mode of operation.
However skipAttach implementation has been stabilized and the dummy
mode of operation is going to be removed from the external-attacher.
Considering this driver work on volumeattachment objects for NBD driver
use cases, we have to implement dummy controllerpublish and unpublish
and thus keep supporting our operations even in absence of dummy mode
of operation in the sidecar.
This commit make a NOOP controller publish and unpublish for RBD driver.
CephFS driver does not require attacher and it has already been made free
from the attachment operations.
Ref# https://github.com/ceph/ceph-csi/pull/3149
Ref# https://github.com/kubernetes-csi/external-attacher/issues/226
Signed-off-by: Humble Chirammal <hchiramm@redhat.com>
`--setmetadata` is false by default, honoring it
will keep the metadata disabled by default
Signed-off-by: Prasanna Kumar Kalever <prasanna.kalever@redhat.com>
`--setmetadata` is false by default, honoring it
will keep the metadata disabled by default
Signed-off-by: Prasanna Kumar Kalever <prasanna.kalever@redhat.com>
Make sure to set metadata when subvolume snapshot exist, i.e. if the
provisioner pod is restarted while createSnapShot is in progress, say it
created the subvolume snapshot but didn't yet set the metadata.
Signed-off-by: Prasanna Kumar Kalever <prasanna.kalever@redhat.com>
Set snapshot-name/snapshot-namespace/snapshotcontent-name details
on subvolume snapshots as metadata on create.
Signed-off-by: Prasanna Kumar Kalever <prasanna.kalever@redhat.com>
This change helps read the cluster name from the cmdline args,
the provisioner will set the same on the subvolume.
Signed-off-by: Prasanna Kumar Kalever <prasanna.kalever@redhat.com>
Make sure to set metadata when subvolume exist, i.e. if the provisioner pod
is restarted while createVolume is in progress, say it created the subvolume
but didn't yet set the metadata.
Signed-off-by: Prasanna Kumar Kalever <prasanna.kalever@redhat.com>
This helps Monitoring solutions without access to Kubernetes clusters to
display the details of the PV/PVC/NameSpace in their dashboard.
Signed-off-by: Prasanna Kumar Kalever <prasanna.kalever@redhat.com>
After Failover of workloads to the secondary
cluster when the primary cluster is down,
RBD Image is not marked healthy, and VR
resources are not promoted to the Primary,
In VolumeReplication, the `CURRENT STATE`
remains Unknown and doesn't change to Primary.
This happens because the primary cluster went down,
and we have force promoted the image on the
secondary cluster. and the image stays in
up+stopping_replay or could be any other states.
Currently assumption was that the image will
always be `up+stopped`. But the image will be in
`up+stopped` only for planned failover and it
could be in any other state if its a forced
failover. For this reason, removing
checkHealthyPrimary from the PromoteVolume RPC call.
Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>
Recently the k8s.io/mount-utils package added more runtime dectection.
When creating a new Mounter, the detect is run every time. This is
unfortunate, as it logs a message like the following:
```
mount_linux.go:283] Detected umount with safe 'not mounted' behavior
```
This message might be useful, so it probably good to keep it.
In Ceph-CSI there are various locations where Mounter instances are
created. Moving that to the DefaultNodeServer type reduces it to a
single place. Some utility functions need to accept the additional
parameter too, so that has been modified as well.
See-also: kubernetes/kubernetes#109676
Signed-off-by: Niels de Vos <ndevos@redhat.com>
Looks like cephfs snapshot size is buggy and its
getting removed in ceph fs. we cannot get the size
of the snapshot during CreateVolume call, so we cannot
do any size check at CreateVolume to check if the
restore size is smaller or not.
As we are removing this check it also fixes#3147
but we dont have any validation at CSI level for
smaller restore we need to depend on kubernetes
external-provisioner for it.
fixes: #3147
Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>
Due to the bug in the df stat we need to round off
the subvolume size to align with 4Mib.
Note:- Minimum supported size in cephcsi is 1Mib,
we dont need to take care of Kib.
fixes#3240
More details at https://github.com/ceph/ceph/pull/46905
Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>
While creating subvolumes, CephFS driver set the mode to `777`
and pass it along to go ceph apis which cause the subvolume
permission to be on 777, however if we create a subvolume
directly in the ceph cluster, the default permission bits are
set which is 755 for the subvolume. This commit try to stick
to the default behaviour even while creating the subvolume.
This also means that we can work with fsgrouppolicy set to
`File` in csiDriver object which is also addressed in this commit.
Signed-off-by: Humble Chirammal <hchiramm@redhat.com>
When the Ceph user is restricted to a specific namespace in the pool, it is
crucial that evey interaction with the cluster is done within that namespace.
This wasn't the case in `getCloneDepth()`.
This issue was causing snapshot creation to fail with
> Failed to check and update snapshot content: failed to take snapshot of the
> volume X: "rpc error: code = Internal desc = rbd: ret=-1, Operation not
> permitted"
Signed-off-by: Benoît Knecht <bknecht@protonmail.ch>
There are regular reports that identify a non-error as the cause of
failures. The Kubernetes mount-utils package has detection for systemd
based environments, and if systemd is unavailable, the following error
is logged:
Cannot run systemd-run, assuming non-systemd OS
systemd-run output: System has not been booted with systemd as init
system (PID 1). Can't operate.
Failed to create bus connection: Host is down, failed with: exit status 1
Because of the `failed` and `exit status 1` error message, users might
assume that the mounting failed. This does not need to be the case. The
container-images that the Ceph-CSI projects provides, do not use
systemd, so the error will get logged with each mount attempt.
By using the newer MountSensitiveWithoutSystemd() function from the
mount-utils package where we can, the number of confusing logs get
reduced.
Signed-off-by: Niels de Vos <ndevos@redhat.com>
go-ceph provides a new GetFailure() method to retrieve details errors
when cloning failed. This is now included in the `cephFSCloneState`
struct, which was a simple string before.
While modifying the `cephFSCloneState` struct, the constants have been
removed, as go-ceph provides them as well.
Fixes: #3140
Signed-off-by: Niels de Vos <ndevos@redhat.com>
This commit removes the clone incase
unsetAllMetadata or copyEncryptionConfig or
expand fails for createVolumeFromSnapshot
and CreateSnapshot.
It also removes the clone in case of
any failure in createCloneFromImage.
issue: #3103
Signed-off-by: Yati Padia <ypadia@redhat.com>
Address: hugeParam linter
internal/controller/persistentvolume/persistentvolume.go:59:7:
hugeParam: r is heavy (80 bytes); consider passing it by pointer
(gocritic)
[...]
internal/controller/persistentvolume/persistentvolume.go:135:7:
hugeParam: r is heavy (80 bytes); consider passing it by pointer
(gocritic)
func (r ReconcilePersistentVolume) reconcilePV(ctx context.Context, obj
runtime.Object) error {}
Signed-off-by: Prasanna Kumar Kalever <prasanna.kalever@redhat.com>
As we added support to set the metadata on the rbd images created for
the PVC and volume snapshot, by default metadata is set on all the images.
As we have seen we are hitting issues#2327 a lot of times with this,
we start to leave a lot of stale images. Currently, we rely on
`--extra-create-metadata=true` to decide to set the metadata or not,
we cannot set this option to false to disable setting metadata because we
use this for encryption too.
This changes is to provide an option to disable setting the image
metadata when starting cephcsi.
Fixes: #3009
Signed-off-by: Prasanna Kumar Kalever <prasanna.kalever@redhat.com>
Removed the code in checkHealthyPrimary which
makes the ceph call, passing it as input now.
Added unit test for checkHealthyPrimary function
Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>
we need to check for image should be in up+stopped state
not anyone of the state for that the we need to use
OR check not the AND check.
Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>
When the image is force promoted to primary on the
cluster the remote image might not be in replaying
state because due to the split brain state. This
PR reverts back the commit
c3c87f2ef3. Which we added
to check the remote image status.
Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>
Kubernetes 1.24 and newer use a different path for staging the volume.
That means the CSI-driver is requested to mount the volume at an other
location, compared to previous versions of Kubernetes. CSI-drivers
implementing the volumeHealer, must receive the correct path, otherwise
the after a nodeplugin restart the NBD mounts will bailout attempting
to NodeStageVolume() call and return an error.
See-also: kubernetes/kubernetes#107065
Fixes: #3176
Signed-off-by: Prasanna Kumar Kalever <prasanna.kalever@redhat.com>
During failover we do demote the volume on the primary
as the image is still not promoted yet on the remote cluster,
there are spurious split-brain errors reported by RBD,
the Cephcsi resync will attempt to resync from the "known"
secondary and that will cause data loss
Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>
create the token if kubernetes version in
1.24+ and use it for vault sa.
Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>
Signed-off-by: Rakshith R <rar@redhat.com>
This commit implements most of
docs/design/proposals/cephfs-snapshot-shallow-ro-vol.md design document;
specifically (de-)provisioning of snapshot-backed volumes, mounting such
volumes as well as mounting pre-provisioned snapshot-backed volumes.
Signed-off-by: Robert Vasek <robert.vasek@cern.ch>
RBD supports creating rbd images with
object size, stripe unit and stripe count
to support striping. This PR adds the support
for the same.
More details about striping at
https://docs.ceph.com/en/quincy/man/8/rbd/#stripingfixes: #3124
Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>
This change helps read the cluster name from the cmdline args,
the provisioner will set the same on the RBD images.
Fixes: #2973
Signed-off-by: Prasanna Kumar Kalever <prasanna.kalever@redhat.com>
In case of pre-provisioned volume the clusterID is
not set in the volume context as the clusterID is missing
we cannot extract the NetNamespaceFilePath from the
configuration file. For static volume and dynamically
provisioned volume the clusterID is set.
Note:- This is a special case to support mounting PV
without clusterID parameter.
Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>
Before the change, the error msg was the following:
```
failed to set VAULT_AUTH_MOUNT_PATH in Vault config: path is empty
```
`vaultAuthPath` is the actual variable name set by the
user. The error message will now be the following:
```
failed to set "vaultAuthPath" in vault config: path is empty
```
Signed-off-by: Rakshith R <rar@redhat.com>
This commit adds support for pvc-pvc clone.
Only capability needed to be advertised, the
underlying support is already provided by cephfs
backend.
Signed-off-by: Rakshith R <rar@redhat.com>
continue running rbd driver when /sys/bus/rbd/supported_features file is
missing, do not bailout.
Fixes: #2678
Signed-off-by: Prasanna Kumar Kalever <prasanna.kalever@redhat.com>
krbdFeatures is set to zero when kernel version < 3.8, i.e. in case where
/sys/bus/rbd/supported_features is absent and we are unable to prepare
the krbd attributes based on kernel version.
When krbdFeatures is set to zero fallback to NBD only when autofallback
is turned ON.
Fixes: #2678
Signed-off-by: Prasanna Kumar Kalever <prasanna.kalever@redhat.com>
Upstream /sys/bus/rbd/supported_features is part of Linux kernel v4.11.0
Prepare the attributes and use them in case if
/sys/bus/rbd/supported_features is missing.
Signed-off-by: Prasanna Kumar Kalever <prasanna.kalever@redhat.com>
Move k8s.GetVolumeMetadata() out of setVolumeMetadata() and rename it to
setAllMetadata() so that the same can be used for setting volume and
snapshot metadata.
Signed-off-by: Prasanna Kumar Kalever <prasanna.kalever@redhat.com>
There is not much the NFS-provisioner needs to do to expand a volume,
everything is handled by the CephFS components.
NFS does not need a resize on the node, so only ControllerExpandVolume
is required.
Signed-off-by: Niels de Vos <ndevos@redhat.com>
For the default mounter the mounter option
will not be set in the storageclass and as it is
not available in the storageclass same will not
be set in the volume context, Because of this the
mapOptions are getting discarded. If the mounter
is not set assuming it's an rbd mounter.
Note:- If the mounter is not set in the storageclass
we can set it in the volume context explicitly,
Doing this check-in node server to support backward
existing volumes and the check is minimal we are not
altering the volume context.
fixes: #3076
Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>
With cgroup v2, the location of the pids.max file changed and so did the
/proc/self/cgroup file
new /proc/self/cgroup file
`
0::/user.slice/user-500.slice/session-14.scope
`
old file:
`
11:pids:/user.slice/user-500.slice/session-2.scope
10:blkio:/user.slice
9:net_cls,net_prio:/
8:perf_event:/
...
`
There is no directory per subsystem (e.g. /sys/fs/cgroup/pids) any more, all
files are now in one directory.
fixes: https://github.com/ceph/ceph-csi/issues/3085
Signed-off-by: Marcus Röder <m.roeder@yieldlab.de>
This commit makes modification so as to allow pvc-pvc clone
with different storageclass having different encryption
configs.
This commit also modifies `copyEncryptionConfig()` to
include a `isEncrypted()` check within the function.
Signed-off-by: Rakshith R <rar@redhat.com>
Before the change, the error msg was the following:
```
failed to set VAULT_AUTH_MOUNT_PATH in Vault config: path is empty
```
`vaultAuthPath` is the actual variable name set by the
user. The error message will now be the following:
```
failed to set "vaultAuthPath" in vault config: path is empty
```
Signed-off-by: Rakshith R <rar@redhat.com>
In case the NFS-export has already been removed from the NFS-server, but
the CSI Controller was restarted, a retry to remove the NFS-volume will
fail with an error like:
> GRPC error: ....: response status not empty: "Export does not exist"
When this error is reported, assume the NFS-export was already removed
from the NFS-server configuration, and continue with deleting the
backend volume.
Signed-off-by: Niels de Vos <ndevos@redhat.com>
