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rbd: cleanup inconsistent state in reserveSnap()
after a failure
`reserveSnap()` can potentially fail halfway through, in that case it needs to undo the snapshot reservation and restore modified attributes of the snapshot. Fixes: #4945 Signed-off-by: Niels de Vos <ndevos@ibm.com>
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@ -388,6 +388,18 @@ func (ri *rbdImage) repairImageID(ctx context.Context, j *journal.Connection, fo
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func reserveSnap(ctx context.Context, rbdSnap *rbdSnapshot, rbdVol *rbdVolume, cr *util.Credentials) error {
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var err error
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// restore original values in case of an error
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origReservedID := rbdSnap.ReservedID
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origRbdSnapName := rbdSnap.RbdSnapName
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origVolID := rbdSnap.VolID
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defer func() {
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if err != nil {
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rbdSnap.ReservedID = origReservedID
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rbdSnap.RbdSnapName = origRbdSnapName
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rbdSnap.VolID = origVolID
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}
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}()
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journalPoolID, imagePoolID, err := util.GetPoolIDs(ctx, rbdSnap.Monitors, rbdSnap.JournalPool, rbdSnap.Pool, cr)
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if err != nil {
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return err
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@ -405,6 +417,17 @@ func reserveSnap(ctx context.Context, rbdSnap *rbdSnapshot, rbdVol *rbdVolume, c
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ctx, rbdSnap.JournalPool, journalPoolID, rbdSnap.Pool, imagePoolID,
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rbdSnap.RequestName, rbdSnap.NamePrefix, rbdVol.RbdImageName, kmsID, rbdSnap.ReservedID, rbdVol.Owner,
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"", encryptionType)
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defer func() {
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// only undo the reservation when an error occurred
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if err == nil {
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return
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}
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undoErr := undoSnapReservation(ctx, rbdSnap, cr)
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if undoErr != nil {
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log.WarningLog(ctx, "failed undoing reservation of snapshot %q: %v", rbdSnap, undoErr)
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}
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}()
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if err != nil {
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return err
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}
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