ceph: fix rare potential cap leak



If we grab new_cap, retake the lock, and find we already have a cap now
for the given mds, release new_cap.

Signed-off-by: Sage Weil <sage@newdream.net>

parent 12a2f643

fs/ceph/caps.c

+2 −1

Original line number	Diff line number	Diff line
		@@ -569,7 +569,8 @@ int ceph_add_cap(struct inode *inode,
		list_add_tail(&cap->session_caps, &session->s_caps);
		session->s_nr_caps++;
		spin_unlock(&session->s_cap_lock);
		}
		} else if (new_cap)
		ceph_put_cap(mdsc, new_cap);

		if (!ci->i_snap_realm) {
		/*