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To: Scott Long <scottl@samsco.org>
From: "Poul-Henning Kamp" <phk@phk.freebsd.dk>
In-Reply-To: Your message of "Thu, 10 Nov 2005 06:57:15 MST."
	<437351BB.6000103@samsco.org> 
Date: Thu, 10 Nov 2005 15:21:54 +0100
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Cc: Doug White <dwhite@FreeBSD.org>, cvs-src@FreeBSD.org,
	src-committers@FreeBSD.org, Doug White <dwhite@gumbysoft.com>,
	cvs-all@FreeBSD.org
Subject: Re: cvs commit: src/sys/kern vfs_subr.c src/sys/fs/devfs
	devfs_vnops.c 
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In message <437351BB.6000103@samsco.org>, Scott Long writes:

>Putting the cookie into the dirent means either changing the size of the
>dirent struct and breaking the userland ABI (almost as bad as changing
>the size of stat, but not quite), or making a 'kdirent' struct and then
>manually shifting and copying it to a dirent struct.

Not really that bad.

My idea was to make a 
	struct kdirent {
		struct dirent	foo;
		cookie stuff	bar;
	}

Filesystems would call vfs_read_dirent() with a struct kdirent and
depending on the userland/kernel flag in the uio vfs_read_dirent()
would copy either the entire kdirent or only the userspace dirent.


>What I really think this is is a ploy by PHK to get someone motivated to
>fix it for him ;-)

I'm generally in favour of people doing work so I don't have to but
in this particular case that was not the motivation :-)

(At least you can't prove anything!)

Poul-Henning

-- 
Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk@FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.