[PATCH 4.19 202/271] pnfs: Fix a problem where we gratuitously start doing I/O through the MDS

[Greg Kroah-Hartman]

From: Trond Myklebust <trond.mykleb...@hammerspace.com>

commit 58bbeab425c6c5e318f5b6ae31d351331ddfb34b upstream.

If the client has to stop in pnfs_update_layout() to wait for another
layoutget to complete, it currently exits and defaults to I/O through
the MDS if the layoutget was successful.

Fixes: d03360aaf5cc ("pNFS: Ensure we return the error if someone kills...")
Signed-off-by: Trond Myklebust <trond.mykleb...@hammerspace.com>
Cc: sta...@vger.kernel.org # v4.20+
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>

---
 fs/nfs/pnfs.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/fs/nfs/pnfs.c
+++ b/fs/nfs/pnfs.c
@@ -1867,7 +1867,7 @@ lookup_again:
                spin_unlock(&ino->i_lock);
                lseg = ERR_PTR(wait_var_event_killable(&lo->plh_outstanding,
                                        !atomic_read(&lo->plh_outstanding)));
-               if (IS_ERR(lseg) || !list_empty(&lo->plh_segs))
+               if (IS_ERR(lseg))
                        goto out_put_layout_hdr;
                pnfs_put_layout_hdr(lo);
                goto lookup_again;