[GFS2] Wendy's dump lockname in hex & fix glock dump

With this patch, gfs2 glockdump through the debugfs filesystem will only
dump glocks for the specified filesystem instead of all glocks. Also, to
aid debugging, the glock number is dumped in hex instead of decimal.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
Signed-off-by: S. Wendy Cheng <wcheng@redhat.com>
Signed-off-by: Abhijith Das <adas@redhat.com>

fs/gfs2/glock.c

@@ -1844,7 +1844,7 @@ static int dump_glock(struct glock_iter *gi, struct gfs2_glock *gl)
 
 	spin_lock(&gl->gl_spin);
 
-	print_dbg(gi, "Glock 0x%p (%u, %llu)\n", gl, gl->gl_name.ln_type,
+	print_dbg(gi, "Glock 0x%p (%u, 0x%llx)\n", gl, gl->gl_name.ln_type,
 		   (unsigned long long)gl->gl_name.ln_number);
 	print_dbg(gi, "  gl_flags =");
 	for (x = 0; x < 32; x++) {
@@ -2024,20 +2024,21 @@ static int gfs2_glock_iter_next(struct glock_iter *gi)
 {
 	struct gfs2_glock *gl;
 
+restart:
 	read_lock(gl_lock_addr(gi->hash));
 	gl = gi->gl;
 	if (gl) {
-		gi->gl = hlist_entry(gl->gl_list.next, struct gfs2_glock,
-				     gl_list);
+		gi->gl = hlist_entry(gl->gl_list.next,
+				     struct gfs2_glock, gl_list);
 		if (gi->gl)
 			gfs2_glock_hold(gi->gl);
 	}
 	read_unlock(gl_lock_addr(gi->hash));
 	if (gl)
 		gfs2_glock_put(gl);
-
-	while(gi->gl == NULL) {
+	if (gl && gi->gl == NULL)
 		gi->hash++;
+	while(gi->gl == NULL) {
 		if (gi->hash >= GFS2_GL_HASH_SIZE)
 			return 1;
 		read_lock(gl_lock_addr(gi->hash));
@@ -2046,7 +2047,12 @@ static int gfs2_glock_iter_next(struct glock_iter *gi)
 		if (gi->gl)
 			gfs2_glock_hold(gi->gl);
 		read_unlock(gl_lock_addr(gi->hash));
+		gi->hash++;
 	}
+
+	if (gi->sdp != gi->gl->gl_sbd)
+		goto restart;
+
 	return 0;
 }
 
@@ -2068,16 +2074,10 @@ static struct glock_iter *gfs2_glock_iter_init(struct gfs2_sbd *sdp)
 	gi->sdp = sdp;
 	gi->hash = 0;
 	gi->seq = NULL;
+	gi->gl = NULL;
 	memset(gi->string, 0, sizeof(gi->string));
 
-	read_lock(gl_lock_addr(gi->hash));
-	gi->gl = hlist_entry(gl_hash_table[gi->hash].hb_list.first,
-			     struct gfs2_glock, gl_list);
-	if (gi->gl)
-		gfs2_glock_hold(gi->gl);
-	read_unlock(gl_lock_addr(gi->hash));
-
-	if (!gi->gl && gfs2_glock_iter_next(gi)) {
+	if (gfs2_glock_iter_next(gi)) {
 		gfs2_glock_iter_free(gi);
 		return NULL;
 	}