gfs2: use lockref_init for gl_lockref

Move the initialization of gl_lockref from gfs2_init_glock_once() to
gfs2_glock_get(). This allows to use lockref_init() there.

Reviewed-by: Christoph Hellwig <[e-mail]>
Signed-off-by: Andreas Gruenbacher <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Christian Brauner <[e-mail]>

fs/gfs2/glock.c

···
 	if (glops->go_instantiate)
 		gl->gl_flags |= BIT(GLF_INSTANTIATE_NEEDED);
 	gl->gl_name = name;
+	lockref_init(&gl->gl_lockref, 1);
 	lockdep_set_subclass(&gl->gl_lockref.lock, glops->go_subclass);
-	gl->gl_lockref.count = 1;
 	gl->gl_state = LM_ST_UNLOCKED;
 	gl->gl_target = LM_ST_UNLOCKED;
 	gl->gl_demote_state = LM_ST_EXCLUSIVE;

fs/gfs2/main.c

···
 {
 	struct gfs2_glock *gl = foo;
 
-	spin_lock_init(&gl->gl_lockref.lock);
 	INIT_LIST_HEAD(&gl->gl_holders);
 	INIT_LIST_HEAD(&gl->gl_lru);
 	INIT_LIST_HEAD(&gl->gl_ail_list);