ceph: keep auth cap when inode has flocks or posix locks
file locks are tracked by inode's auth mds. dropping auth caps
is equivalent to releasing all file locks.
Signed-off-by: "Yan, Zheng" <zyan@redhat.com>
Acked-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
diff --git a/fs/ceph/mds_client.c b/fs/ceph/mds_client.c
index 0687ab3..c8a811d 100644
--- a/fs/ceph/mds_client.c
+++ b/fs/ceph/mds_client.c
@@ -1462,6 +1462,11 @@ static int trim_caps_cb(struct inode *inode, struct ceph_cap *cap, void *arg)
goto out;
if ((used | wanted) & CEPH_CAP_ANY_WR)
goto out;
+ /* Note: it's possible that i_filelock_ref becomes non-zero
+ * after dropping auth caps. It doesn't hurt because reply
+ * of lock mds request will re-add auth caps. */
+ if (atomic_read(&ci->i_filelock_ref) > 0)
+ goto out;
}
/* The inode has cached pages, but it's no longer used.
* we can safely drop it */