}
		logger.CriticalIf(context.Background(), err)
		return r, err
	}
	return config.ToRetention(), nil
}

// enforceRetentionForDeletion checks if it is appropriate to remove an
// object according to locking configuration when this is lifecycle/ bucket quota asking.
func enforceRetentionForDeletion(ctx context.Context, objInfo ObjectInfo) (locked bool) {
	if objInfo.DeleteMarker {
		return false
	}

		m.closeLocked()
		return false
	}
}

func (m *muxClient) close() {
	if debugPrint {
		fmt.Println("closing outgoing mux", m.MuxID)
	}
	if !m.respMu.TryLock() {
		// Cancel before locking - will unblock any pending sends.
		if m.cancelFn != nil {
			m.cancelFn(context.Canceled)
		}
		// Wait for senders to release.
		m.respMu.Lock()
	}

	defer m.respMu.Unlock()
	m.closeLocked()
}

//
// You should have received a copy of the GNU Affero General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.

// Package lock - implements filesystem locking wrappers around an
// open file descriptor.
package lock

import (
	"errors"
	"os"
	"sync"
)

// ErrAlreadyLocked is returned if the underlying fd is already locked.

	},
	ErrInvalidLifecycleWithObjectLock: {
		Code:           "InvalidLifecycleWithObjectLock",
		Description:    "The lifecycle configuration containing MaxNoncurrentVersions is not supported with object locking",
		HTTPStatusCode: http.StatusBadRequest,
	},
	ErrNoSuchBucketSSEConfig: {
		Code:           "ServerSideEncryptionConfigurationNotFoundError",
		Description:    "The server side encryption configuration was not found",

	}

	rcfg, _ := globalBucketObjectLockSys.Get(bucket)
	if rcfg.LockEnabled && opts.DeletePrefix {
		apiErr := toAPIError(ctx, errInvalidArgument)
		apiErr.Description = "force-delete is forbidden on Object Locking enabled buckets"
		writeErrorResponse(ctx, w, apiErr, r.URL)
		return
	}

	os := newObjSweeper(bucket, object).WithVersion(opts.VersionID).WithVersioning(opts.Versioned, opts.VersionSuspended)

	nsMutex := nsLockMap{
		isDistErasure: isDistErasure,
	}
	if isDistErasure {
		return &nsMutex
	}
	nsMutex.lockMap = make(map[string]*nsLock)
	return &nsMutex
}

// nsLock - provides primitives for locking critical namespace regions.
type nsLock struct {
	ref int32
	*lsync.LRWMutex
}

// nsLockMap - namespace lock map, provides primitives to Lock,
// Unlock, RLock and RUnlock.
type nsLockMap struct {

func TestFailedRefreshLock(t *testing.T) {
	if testing.Short() {
		t.Skip("skipping test in short mode.")
	}

	// Simulate Refresh response to return no locking found
	for i := range lockServers[:3] {
		lockServers[i].setRefreshReply(false)
		defer lockServers[i].setRefreshReply(true)
	}

	dm := NewDRWMutex(ds, "aap")
	dm.refreshInterval = 500 * time.Millisecond