[PATCH] ceph: keep consistent semantic in fscache related option combination

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When specifying multiple fscache related options, the result isn't always
the same as option order, this fix will keep strict consistent meaning
by order.

Signed-off-by: Chengguang Xu <cgxu519@xxxxxxxxxx>
---
 fs/ceph/super.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/fs/ceph/super.c b/fs/ceph/super.c
index 7f1e212..e654005 100644
--- a/fs/ceph/super.c
+++ b/fs/ceph/super.c
@@ -314,9 +314,13 @@ static int parse_fsopt_token(char *c, void *private)
 		break;
 	case Opt_fscache:
 		fsopt->flags |= CEPH_MOUNT_OPT_FSCACHE;
+		kfree(fsopt->fscache_uniq);
+		fsopt->fscache_uniq = NULL;
 		break;
 	case Opt_nofscache:
 		fsopt->flags &= ~CEPH_MOUNT_OPT_FSCACHE;
+		kfree(fsopt->fscache_uniq);
+		fsopt->fscache_uniq = NULL;
 		break;
 	case Opt_poolperm:
 		fsopt->flags &= ~CEPH_MOUNT_OPT_NOPOOLPERM;
-- 
1.8.3.1

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