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Re: kern/41189: kernel panic xen dom0 using mke2fs & WAPBL
The following reply was made to PR kern/41189; it has been noted by GNATS.
From: yamt%mwd.biglobe.ne.jp@localhost (YAMAMOTO Takashi)
Cc: dholland-bugs%netbsd.org@localhost, tech-kern%netbsd.org@localhost,
Subject: Re: kern/41189: kernel panic xen dom0 using mke2fs & WAPBL
Date: Sun, 10 May 2009 05:41:55 +0000 (UTC)
> I should have been clearer. Have a look at the bigger picture.
> - We have longstanding problems with device nodes showing up in multiple
> file systems. For 6.0 we have devfs coming along, which will at some point
> in its development likely eliminate the need to support device nodes on
> other file systems. So devfs will give us a 1:1 mapping between device
> instances and vnodes (or maybe devfs inodes).
i don't think devfs is necessary here.
just giving up updating timestamps of mounted VBLK special files is enough.
> - We have longstanding problems providing block device semantics. Block
> devices are an interesting toy but they have no real application. Disk
> character devices suffice with one exception: on NetBSD, transfers on
> these devices must be aligned. So there is no need for physio to cache,
> it could simply buffer to allow misaligned transfers.
are there applications of the misaligned transfers?
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