[issue1653] vinum: page fault panic in vn_strategy

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

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

The problem here lies within open_drive and especially vn_opendisk. vn_opendisk 
is synthesizing a vnode with a given major/minor, which can only go wrong with 
devfs. The correct solution would be to do a namecache lookup (look for 
references to nlookup_init or nlookup_init_raw for sample code) instead of 
calling getsynthvnode() in vn_opendisk.

Would be good if someone (tux?) could take care of this; it should be rather 
straightforward. If that's not possible, I'll post a fix whenever I have some 
more time (~ 1 week).

Cheers,
Alex Hornung

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priority:  -> bug

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