[Cluster-devel] [GFS2 PATCH] GFS2: Re-add the rcu_read_lock in glock_hash_walk

[Bob Peterson]

Hi,

This patch adds back the call to rcu_read_lock() and corresponding
rcu_read_unlock() in function glock_hash_walk() as suggested by
Andreas.

Signed-off-by: Bob Peterson <rpeterso at redhat.com>
---
diff --git a/fs/gfs2/glock.c b/fs/gfs2/glock.c
index 294f80d..c9c5c45 100644
--- a/fs/gfs2/glock.c
+++ b/fs/gfs2/glock.c
@@ -1423,6 +1423,7 @@ static void glock_hash_walk(glock_examiner examiner, const struct gfs2_sbd *sdp)
 	const struct bucket_table *tbl;
 	int i;
 
+	rcu_read_lock();
 	tbl = rht_dereference_rcu(gl_hash_table.tbl, &gl_hash_table);
 	for (i = 0; i < tbl->size; i++) {
 		rht_for_each_entry_safe(gl, pos, next, tbl, i, gl_node) {
@@ -1431,6 +1432,7 @@ static void glock_hash_walk(glock_examiner examiner, const struct gfs2_sbd *sdp)
 				examiner(gl);
 		}
 	}
+	rcu_read_unlock();
 	cond_resched();
 }