Re: HEADSUP: Change of makedev() semantics.

From: Robert Watson (rwatson_at_FreeBSD.org)
Date: 09/29/03

  • Next message: Greg 'groggy' Lehey: "Re: HEADSUP: Change of makedev() semantics." 
    Date: Sun, 28 Sep 2003 19:46:20 -0400 (EDT)
To: "Greg 'groggy' Lehey" <grog@FreeBSD.org>

    On Mon, 29 Sep 2003, Greg 'groggy' Lehey wrote:

    > On Sunday, 28 September 2003 at 23:22:07 +0200, Poul-Henning Kamp wrote:
    > > Basically:
    > >
    > > 3. If you do a "normal" device driver, cache the result
    > > from when you call make_dev().
    > > ...
    > >
    > > ./dev/vinum
    > > Failure to cache result of make_dev() ?
    >
    > Where should this be cached? Can you point to example code?

    Actually, it looks like Vinum is caching the dev_t's, but it's not always
    using them to get back to the dev_t--sometimes it's invoking makedev()
    instead. However, this appears to happen only in the vinumrevive.c code,
    so I'm not sure if that's a property of the cached reference being
    unavailable -- it looks like it should be available in that context
    though. I.e., using sd->dev instead of VINUM_SD() -- it looks like there
    is a valid (struct sd *) reference there to follow, so you can get to the
    dev_t without doing a makedev().

    Robert N M Watson FreeBSD Core Team, TrustedBSD Projects
    robert@fledge.watson.org Network Associates Laboratories

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