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rbd: handle when krbdFeatures is zero

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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>
This commit is contained in:
Prasanna Kumar Kalever
2022-05-13 12:32:11 +05:30
committed by mergify[bot]
parent e53fd87154
commit 83cc1b0e58
3 changed files with 25 additions and 6 deletions
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9
internal/rbd/rbd_util.go
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@ -328,7 +328,12 @@ func HexStringToInteger(hexString string) (uint, error) {
// isKrbdFeatureSupported checks if a given Image Feature is supported by krbd
// driver or not.
func isKrbdFeatureSupported(ctx context.Context, imageFeatures string) bool {
func isKrbdFeatureSupported(ctx context.Context, imageFeatures string) (bool, error) {
// return false when /sys/bus/rbd/supported_features is absent and we are
// not in a position to prepare krbd feature attributes, i.e. if kernel <= 3.8
if krbdFeatures == 0 {
return false, os.ErrNotExist
}
arr := strings.Split(imageFeatures, ",")
log.UsefulLog(ctx, "checking for ImageFeatures: %v", arr)
imageFeatureSet := librbd.FeatureSetFromNames(arr)
@ -343,7 +348,7 @@ func isKrbdFeatureSupported(ctx context.Context, imageFeatures string) bool {
}
}
return supported
return supported, nil
}
// Connect an rbdVolume to the Ceph cluster.