fs: dlm: add resource name to tracepoints

This patch adds the resource name to dlm tracepoints.  The name
usually comes through the lkb_resource, but in some cases a resource
may not yet be associated with an lkb, in which case the name and
namelen parameters are used.

It should be okay to access the lkb_resource and the res_name field at
the time when the tracepoint is invoked. The resource is assigned to a
lkb and it's reference is being held during the tracepoint call. During
this time the resource cannot be freed. Also a lkb will never switch
its assigned resource. The name of a dlm_rsb is assigned at creation
time and should never be changed during runtime as well.

The TP_printk() call uses always a hexadecimal string array
representation for the resource name (which is not necessarily ascii.)

Signed-off-by: Alexander Aring <aahringo@redhat.com>
Signed-off-by: David Teigland <teigland@redhat.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/fs/dlm/lock.c b/fs/dlm/lock.c
index 226822f49d30..e80d42ba64ae 100644
--- a/fs/dlm/lock.c
+++ b/fs/dlm/lock.c
@@ -3472,7 +3472,7 @@ int dlm_lock(dlm_lockspace_t *lockspace,
 	if (error)
 		goto out;
 
-	trace_dlm_lock_start(ls, lkb, mode, flags);
+	trace_dlm_lock_start(ls, lkb, name, namelen, mode, flags);
 
 	error = set_lock_args(mode, lksb, flags, namelen, 0, ast,
 			      astarg, bast, &args);
@@ -3487,7 +3487,7 @@ int dlm_lock(dlm_lockspace_t *lockspace,
 	if (error == -EINPROGRESS)
 		error = 0;
  out_put:
-	trace_dlm_lock_end(ls, lkb, mode, flags, error);
+	trace_dlm_lock_end(ls, lkb, name, namelen, mode, flags, error);
 
 	if (convert || error)
 		__put_lkb(ls, lkb);