tree 3ff8e570a00668a6e17a0f27d3b5ced8a4dd4089
parent d67c72e6cce99eab5ab9d62c599e33e5141ff8b4
author Jeff Layton <jlayton@kernel.org> 1585933747 -0400
committer Ilya Dryomov <idryomov@gmail.com> 1591010573 +0200

ceph: ceph_kick_flushing_caps needs the s_mutex

The mdsc->cap_dirty_lock is not held while walking the list in
ceph_kick_flushing_caps, which is not safe.

ceph_early_kick_flushing_caps does something similar, but the
s_mutex is held while it's called and I think that guards against
changes to the list.

Ensure we hold the s_mutex when calling ceph_kick_flushing_caps,
and add some clarifying comments.

Signed-off-by: Jeff Layton <jlayton@kernel.org>
Reviewed-by: "Yan, Zheng" <zyan@redhat.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>