support/nfs/exports.c
505 if (strcmp(opt, "ro") == 0)
506 setflags(NFSEXP_READONLY, active, ep);
507 else if (strcmp(opt, "rw") == 0)
508 clearflags(NFSEXP_READONLY, active, ep);
...
624 } else if (strncmp(opt, "sec=", 4) == 0) {
625 active = parse_flavors(opt+4, ep);
If you find a 'sec=' you go ahead and set it in the e_secinfo array.
But if you encounter a rw or ro before you encounter a 'sec=', you do
not set a flavor in the e_secinfo array.
What we do is if we encounter the 'rw' or 'ro' before the 'sec=', then
it defaults to being a AUTH_SYS flavor. If we encounter it after, then
we know which flavor to set it as.
Of course, we have to account for what happens if we have the following:
share -F nfs -o rw,sec=sys,ro /foo
Because we can't have both a rw and ro export.
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