vfs/vnode/file overhaul

Dennis Melentyev dennis.melentyev at gmail.com
Wed Jul 25 03:08:20 PDT 2007

Although not precisely in a topic, but somewhat related:
It would be great to eliminate long standing bug-o-featire in FreeBSD,
famous Floppy-Panic when removing unmounted removable media causes a
panic. It was quite ok with floppies, since they were rarely used, but
really annoing with USB sticks and HDD's.
The same issue recently raised again in freebsd-stable list. But AFAIU
we have completely different VFS layer. So, this case could already
had been covered. Just ignore it if so.
2007/7/25, Simon 'corecode' Schubert <corecode at fs.ei.tum.de>:

as a 1.11 topic I think we should change the vnode/file interface to make more sense.  these are of course just stupid ideas to illustrate what I am thinking of:

- all per-fdesc-I/O runs through a struct file and not directly to a vnode
- vnodes only represent logical entities (on disk), NOT devices or whatnot.
- thus drop specfs, this always seemed switched in at the wrong place in the stack
- this will allow us to do device cloning
- a slim vnode interface makes it easier to do support a...
- userland vfs interface which can support something like the kernel API, so userland drivers have a chance to be easily ported to the kernel.
do I make sense?  feedback expected!

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Dennis Melentyev

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