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Subject[PATCH 3.16 104/136] ceph: add missing check in d_revalidate snapdir handling
3.16.80-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Al Viro <viro@zeniv.linux.org.uk>

commit 1f08529c84cfecaf1261ed9b7e17fab18541c58f upstream.

We should not play with dcache without parent locked...

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
[bwh: Backported to 3.16:
- Test ceph_mds_request::r_locked_dir
- Adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
fs/ceph/inode.c | 1 +
1 file changed, 1 insertion(+)

--- a/fs/ceph/inode.c
+++ b/fs/ceph/inode.c
@@ -1260,6 +1260,7 @@ retry_lookup:
req->r_request_started);
dout(" final dn %p\n", dn);
} else if (!req->r_aborted &&
+ req->r_locked_dir &&
(req->r_op == CEPH_MDS_OP_LOOKUPSNAP ||
req->r_op == CEPH_MDS_OP_MKSNAP)) {
struct dentry *dn = req->r_dentry;
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