Re: Alignment of disk-I/O from userland.

From: Mark Valentine (mark_at_valentine.me.uk)
Date: 10/07/03

  • Next message: Garrett Wollman: "Re: Alignment of disk-I/O from userland." 
    Date: Mon, 6 Oct 2003 23:20:06 +0000
To: wollman@khavrinen.lcs.mit.edu (Garrett Wollman), phk@phk.freebsd.dk

    > From: wollman@khavrinen.lcs.mit.edu (Garrett Wollman)
    > Date: Mon 6 Oct, 2003
    > Subject: Re: Alignment of disk-I/O from userland.

    > I believe that the Standard allows practically arbitrary restrictions
    > on what may be done with devices (since most devices, aside from ttys,
    > are outside the scope of the Standard anyway). It says that read()
    > may fail if:
    >
    > [ENXIO] A request was made of a nonexistent device, or the request
    > was outside the capabilities of the device.

    Hmm, but it doesn't say:

      [EDOOFUS] A request was made of a nonexistent device, or the request
               was outside the capabilities of the device driver writer.

    It would be reasonable to enforce such restrictions on a raw device if
    we still had block devices around, but it doesn't seem reasonable now.

                    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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  • Next message: Garrett Wollman: "Re: Alignment of disk-I/O from userland."

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