From b3c75462df4ab1c9ceaf79c87511be5edd27f9f3 Mon Sep 17 00:00:00 2001
From: adilger <adilger>
Date: Mon, 7 Oct 2002 18:52:10 +0000
Subject: [PATCH] Add some debugging to try and catch OST locking.

---
 lustre/ldlm/ldlm_lock.c  | 12 +++++++++++-
 lustre/ldlm/ldlm_lockd.c |  4 ++++
 2 files changed, 15 insertions(+), 1 deletion(-)

diff --git a/lustre/ldlm/ldlm_lock.c b/lustre/ldlm/ldlm_lock.c
index eb72514..93d67f6 100644
--- a/lustre/ldlm/ldlm_lock.c
+++ b/lustre/ldlm/ldlm_lock.c
@@ -316,6 +316,16 @@ struct ldlm_lock *ldlm_handle2lock(struct lustre_handle *handle)
         if (!kmem_cache_validate(ldlm_lock_slab, (void *)lock))
                 RETURN(NULL);
 
+        if (!lock->l_resource) {
+                CERROR("trying to lock bogus resource: lock %p\n", lock);
+                LDLM_DEBUG(lock, "ldlm_handle2lock(%p)", lock);
+                RETURN(NULL);
+        }
+        if (!lock->l_resource->lr_namespace) {
+                CERROR("trying to lock bogus namespace: lock %p\n", lock);
+                LDLM_DEBUG(lock, "ldlm_handle2lock(%p)", lock);
+                RETURN(NULL);
+        }
         l_lock(&lock->l_resource->lr_namespace->ns_lock);
         if (lock->l_random != handle->cookie)
                 GOTO(out, NULL);
@@ -325,7 +335,7 @@ struct ldlm_lock *ldlm_handle2lock(struct lustre_handle *handle)
 
         retval = LDLM_LOCK_GET(lock);
         EXIT;
-      out:
+ out:
         l_unlock(&lock->l_resource->lr_namespace->ns_lock);
         return retval;
 }
diff --git a/lustre/ldlm/ldlm_lockd.c b/lustre/ldlm/ldlm_lockd.c
index 746af88..7df5ce7 100644
--- a/lustre/ldlm/ldlm_lockd.c
+++ b/lustre/ldlm/ldlm_lockd.c
@@ -347,6 +347,10 @@ int ldlm_handle_cancel(struct ptlrpc_request *req)
                 RETURN(-ENOMEM);
         }
         dlm_req = lustre_msg_buf(req->rq_reqmsg, 0);
+        if (!dlm_req) {
+                CERROR("bad request buffer for cancel\n");
+                RETURN(-EINVAL);
+        }
 
         lock = ldlm_handle2lock(&dlm_req->lock_handle1);
         if (!lock) {
-- 
1.8.3.1