Date: Sun, 19 Sep 1999 22:30:25 +0200 From: Poul-Henning Kamp <phk@critter.freebsd.dk> To: mjacob@feral.com Cc: Matthew Dillon <dillon@apollo.backplane.com>, dg@root.com, Greg Lehey <grog@lemis.com>, cvs-committers@FreeBSD.org, cvs-all@FreeBSD.org Subject: Re: User block device access (was: cvs commit: src/sys/miscfs/specfs spec_vnops.c src/sys/sys vnode.h src/sys/kern vfs_subr.c) Message-ID: <18167.937773025@critter.freebsd.dk> In-Reply-To: Your message of "Sun, 19 Sep 1999 13:20:59 PDT." <Pine.BSF.4.05.9909191318570.42254-100000@semuta.feral.com>
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In message <Pine.BSF.4.05.9909191318570.42254-100000@semuta.feral.com>, Matthew
Jacob writes:
>> Anyway, David (and Kirk through him) has already said their piece, and
>> still nobody has named an actual application which depends on bdevs
>> soo...
>
>Isn't that reasoning in reverse? Wouldn't be fairer to state "the problems
>that we have in the rest of the system are so large because we allow block
>device access to user programs that we must kill off such access?".
In an ideal world yes. I think the fully expanded version sounds like
this:
"
Since having two kinds of access to the device confuses people
used to Linux
and
Since bdevs gives rise to a complications with buffer/caching
and
Since having two interfaces forces us to have two majors for
each device-driver
and
Since bdevs have not been returning write errors for 5+ years
and
Since most of the original reasons for having bdevs have gone
away
and
Since nobody can show real-world applications which rely on
the bdev interface
then
We should kill bdevs
"
Sounds like the preamble to a V.FOO standard from CCITT...
--
Poul-Henning Kamp FreeBSD coreteam member
phk@FreeBSD.ORG "Real hackers run -current on their laptop."
FreeBSD -- It will take a long time before progress goes too far!
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