dlm: use rwlock for rsb hash table

The conversion to rhashtable introduced a hash table lock per lockspace,
in place of per bucket locks.  To make this more scalable, switch to
using a rwlock for hash table access.  The common case fast path uses
it as a read lock.

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/debug_fs.c b/fs/dlm/debug_fs.c
index 70567919f1b7..6ab3ed4074c6 100644
--- a/fs/dlm/debug_fs.c
+++ b/fs/dlm/debug_fs.c
@@ -413,7 +413,7 @@ static void *table_seq_start(struct seq_file *seq, loff_t *pos)
 	else
 		list = &ls->ls_keep;
 
-	spin_lock_bh(&ls->ls_rsbtbl_lock);
+	read_lock_bh(&ls->ls_rsbtbl_lock);
 	return seq_list_start(list, *pos);
 }
 
@@ -434,7 +434,7 @@ static void table_seq_stop(struct seq_file *seq, void *iter_ptr)
 {
 	struct dlm_ls *ls = seq->private;
 
-	spin_unlock_bh(&ls->ls_rsbtbl_lock);
+	read_unlock_bh(&ls->ls_rsbtbl_lock);
 }
 
 static const struct seq_operations format1_seq_ops = {