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kern/43605: tmpfs file handles are broken

>Number:         43605
>Category:       kern
>Synopsis:       tmpfs file handles are broken
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Mon Jul 12 20:55:00 +0000 2010
>Originator:     Antti Kantee
fhopen() fails with EINVAL on tmpfs (internally speaking, VFS_FHTOVP):

        if (tfh.tf_id >= tmp->tm_nodes_max)
                return EINVAL;

Seems like this was broken ~2.5years ago.   ... nobody noticing this
is funny, considering the fuss there was with the "critical"
importance of nfs export capability in tmpfs.
i'll add an atf test soon (it's blocking on an infrastructure issue)

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