[issue1885] Panic when mounting a jailed devfs with jail devfs.conf entries

["Alex Hornung \(via DragonFly issue tracker\)" <sinknull@xxxxxxxxxxxxxxxxxxxxx>]

Alex Hornung <ahornung@gmail.com> added the comment:

Thank you very much for your bug report.

Commits 951cde0415725e26217dd3939611aee9f8404b43 and 
84dcbb7594edee2f15bdaa91d1ca7de55c6a7d58 fix this issue.

The first commit makes sure that the node is in the topology before checking the 
rules which is necessary since the rule checking verifies the parent node.

The second commit fixes mount_devfs which was unconditionally clearing the rules 
of a mountpoint after mounting it. According to the man page (and hence my 
original intentions) this should only happen when the mountpoint was already 
mounted.

Cheers,
Alex Hornung

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status: in-progress -> resolved

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<http://bugs.dragonflybsd.org/issue1885>
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