storage: Return soft err when sector alloc fails in acquire (#11350)

Co-authored-by: Łukasz Magiera <magik6k@gmail.com>

storage/paths/local.go

@@ -548,7 +548,7 @@ func (st *Local) AcquireSector(ctx context.Context, sid storiface.SectorRef, exi
 		}
 
 		if best == "" {
-			return storiface.SectorPaths{}, storiface.SectorPaths{}, xerrors.Errorf("couldn't find a suitable path for a sector")
+			return storiface.SectorPaths{}, storiface.SectorPaths{}, storiface.Err(storiface.ErrTempAllocateSpace, xerrors.Errorf("couldn't find a suitable path for a sector"))
 		}
 
 		storiface.SetPathByType(&out, fileType, best)

storage/pipeline/states_sealing.go

@@ -232,6 +232,7 @@ func retrySoftErr(ctx context.Context, cb func() error) error {
 				fallthrough
 			case storiface.ErrTempAllocateSpace:
 				// retry
+				log.Errorw("retrying soft error", "err", err, "code", cerr.ErrCode())
 			default:
 				// non-temp error
 				return err