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ceph: add missing check in d_revalidate snapdir handling

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commit 1f08529c84cfecaf1261ed9b7e17fab18541c58f upstream.

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

Cc: stable@vger.kernel.org
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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Al Viro 2019-10-29 13:53:29 +00:00 committed by Greg Kroah-Hartman
parent 6f9657793a
commit 78a1d6cdd3
1 changed files with 1 additions and 0 deletions
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fs/ceph/inode.c
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@ -1399,6 +1399,7 @@ int ceph_fill_trace(struct super_block *sb, struct ceph_mds_request *req)
dout(" final dn %p\n", dn); dout(" final dn %p\n", dn);
} else if ((req->r_op == CEPH_MDS_OP_LOOKUPSNAP || } else if ((req->r_op == CEPH_MDS_OP_LOOKUPSNAP ||
req->r_op == CEPH_MDS_OP_MKSNAP) && req->r_op == CEPH_MDS_OP_MKSNAP) &&
test_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags) &&
!test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags)) { !test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags)) {
struct dentry *dn = req->r_dentry; struct dentry *dn = req->r_dentry;
struct inode *dir = req->r_parent; struct inode *dir = req->r_parent;