NFS: Don't use page_file_mapping after removing the page
If nfs_page_async_flush() removes the page from the mapping, then we can't use page_file_mapping() on it as nfs_updatepate() is wont to do when receiving an error. Instead, push the mapping to the stack before the page is possibly truncated. Fixes: 8fc75bed ("NFS: Fix up return value on fatal errors in nfs_page_async_flush()") Signed-off-by: Benjamin Coddington <bcodding@redhat.com> Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
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