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ceph: add missing check in d_revalidate snapdir handling

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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>
This commit is contained in:
Al Viro 2019-10-29 13:53:29 +00:00 committed by Ilya Dryomov
parent aa8dd81673
commit 1f08529c84
1 changed files with 1 additions and 0 deletions
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fs/ceph/inode.c
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@ -1434,6 +1434,7 @@ retry_lookup:
dout(" final dn %p\n", dn);
} else if ((req->r_op == CEPH_MDS_OP_LOOKUPSNAP ||
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)) {
struct inode *dir = req->r_parent;