X-Git-Url: https://git.whamcloud.com/?a=blobdiff_plain;f=lustre%2Flov%2Flov_lock.c;h=de55b2de2f254ea0c6b248e28131d6985bc8bc3f;hb=a585b03a36e61b9039f87135e1542094ae0d6e28;hp=2424581f89911aa2559042556568f24287cd9a55;hpb=ecaba99677b28536f9c376b2b835b554a7792668;p=fs%2Flustre-release.git

diff --git a/lustre/lov/lov_lock.c b/lustre/lov/lov_lock.c
index 2424581..de55b2d 100644
--- a/lustre/lov/lov_lock.c
+++ b/lustre/lov/lov_lock.c
@@ -27,7 +27,7 @@
  * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
  * Use is subject to license terms.
  *
- * Copyright (c) 2011, 2012, Whamcloud, Inc.
+ * Copyright (c) 2011, 2012, Intel Corporation.
  */
 /*
  * This file is part of Lustre, http://www.lustre.org/
@@ -652,8 +652,19 @@ static int lov_lock_enqueue(const struct lu_env *env,
                                                                    sublock);
                                         break;
                                 case CLS_CACHED:
+					cl_lock_get(sublock);
+                                        /* take recursive mutex of sublock */
+                                        cl_lock_mutex_get(env, sublock);
+					/* need to release all locks in closure
+					 * otherwise it may deadlock. LU-2683.*/
+                                        lov_sublock_unlock(env, sub, closure,
+                                                           subenv);
+					/* sublock and parent are held. */
                                         rc = lov_sublock_release(env, lck, i,
                                                                  1, rc);
+					cl_lock_mutex_put(env, sublock);
+					cl_lock_put(env, sublock);
+					break;
                                 default:
                                         lov_sublock_unlock(env, sub, closure,
                                                            subenv);
@@ -1007,6 +1018,11 @@ static int lov_lock_fits_into(const struct lu_env *env,
 
         ENTRY;
 
+	/* for top lock, it's necessary to match enq flags otherwise it will
+	 * run into problem if a sublock is missing and reenqueue. */
+	if (need->cld_enq_flags != lov->lls_orig.cld_enq_flags)
+		return 0;
+
         if (need->cld_mode == CLM_GROUP)
                 /*
                  * always allow to match group lock.
@@ -1200,6 +1216,7 @@ static int lov_empty_lock_print(const struct lu_env *env, void *cookie,
 	return 0;
 }
 
+/* XXX: more methods will be added later. */
 static const struct cl_lock_operations lov_empty_lock_ops = {
 	.clo_fini  = lov_empty_lock_fini,
 	.clo_print = lov_empty_lock_print