tree 1282ac36c201cdc5fab01357fe5910d234403e87
parent d138027a8256a3e9d7657c8d0dae84c08ef2cfe1
author Trond Myklebust <trond.myklebust@primarydata.com> 1472497974 -0400
committer Trond Myklebust <trond.myklebust@primarydata.com> 1472498476 -0400

pNFS/flexfiles: Fix an Oopsable condition when connection to the DS fails

If the attempt to connect to a DS fails inside ff_layout_pg_init_read or
ff_layout_pg_init_write, then we currently end up clearing the layout
segment carried by the struct nfs_pageio_descriptor, causing an Oops
when we later call into ff_layout_read_pagelist/ff_layout_write_pagelist.

The fix is to ensure we return the layout and then retry.

Fixes: 446ca2195303 ("pNFS/flexfiles: When initing reads or writes, we...")
Cc: stable@vger.kernel.org # v4.7+
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>