An export point with the "mountpoint" option should not be exported if it isn't a mount point. For NFSv3, this is handled primarily by failing the MOUNT request. For NFSv4, we must ensure a lookup from the pseduo-root fails too. This means nfsd_export must check for the 'mountpoint' option and handle it correctly. Signed-off-by: NeilBrown <neilb@xxxxxxxx> --- utils/mountd/cache.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/utils/mountd/cache.c b/utils/mountd/cache.c index f33f66640c6c..19e7607e4fb1 100644 --- a/utils/mountd/cache.c +++ b/utils/mountd/cache.c @@ -1321,7 +1321,12 @@ static void nfsd_export(int f) found = lookup_export(dom, path, ai); if (found) { - if (dump_to_cache(f, buf, sizeof(buf), dom, path, &found->m_export) < 0) { + if (found->m_export.e_mountpoint && + !is_mountpoint(found->m_export.e_mountpoint[0]? + found->m_export.e_mountpoint: + found->m_export.e_path)) + dump_to_cache(f, buf, sizeof(buf), dom, path, NULL); + else if (dump_to_cache(f, buf, sizeof(buf), dom, path, &found->m_export) < 0) { xlog(L_WARNING, "Cannot export %s, possibly unsupported filesystem" " or fsid= required", path); -- To unsubscribe from this list: send the line "unsubscribe linux-nfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html