Date: Mon, 6 Oct 2003 23:27:39 +0000 From: Mark Valentine <mark@valentine.me.uk> To: Garrett Wollman <wollman@khavrinen.lcs.mit.edu> Cc: arch@freebsd.org Subject: Re: Alignment of disk-I/O from userland. Message-ID: <200310062227.h96MRdUf075168@dotar.thuvia.org> In-Reply-To: <200310062222.h96MM6MO093683@khavrinen.lcs.mit.edu>
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> From: Garrett Wollman <wollman@khavrinen.lcs.mit.edu> > Date: Mon 6 Oct, 2003 > Subject: Re: Alignment of disk-I/O from userland. > I think you've got that backwards. When we had block devices, they > would provide extra buffering to avoid I/O-size breakage. Character > devices, which are all we have now, never made any promises. My point was that we did have block devices which could make such promises, and that without them the raw device must offer an equivalent promise (especially when you consider binary compatibility - a program opening /dev/da0c was written assuming a block device interface). Cheers, Mark. -- "Tigers will do ANYTHING for a tuna fish sandwich." "We're kind of stupid that way." *munch* *munch* -- <http://www.calvinandhobbes.com>;
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