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Message-ID: <2329129.1596647628@warthog.procyon.org.uk>
Date: Wed, 05 Aug 2020 18:13:48 +0100
From: David Howells <dhowells@...hat.com>
To: James Bottomley <James.Bottomley@...senPartnership.com>
Cc: dhowells@...hat.com, viro@...iv.linux.org.uk,
Theodore Ts'o <tytso@....edu>,
Andreas Dilger <adilger.kernel@...ger.ca>,
Eric Biggers <ebiggers@...nel.org>,
Jeff Layton <jlayton@...nel.org>, linux-ext4@...r.kernel.org,
Carlos Maiolino <cmaiolino@...hat.com>,
"Darrick J. Wong" <darrick.wong@...cle.com>,
linux-api@...r.kernel.org, torvalds@...ux-foundation.org,
raven@...maw.net, mszeredi@...hat.com, christian@...uner.io,
jannh@...gle.com, kzak@...hat.com, jlayton@...hat.com,
linux-fsdevel@...r.kernel.org,
linux-security-module@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 00/18] VFS: Filesystem information [ver #21]
James Bottomley <James.Bottomley@...senPartnership.com> wrote:
> It sort of petered out into a long winding thread about why not use
> sysfs instead, which really doesn't look like a good idea to me.
It seemed to turn into a set of procfs symlinks that pointed at a bunch of
sysfs stuff - or possibly some special filesystem.
> Could I make a suggestion about how this should be done in a way that
> doesn't actually require the fsinfo syscall at all: it could just be
> done with fsconfig.
I'd prefer to keep it separate. The interface for fsconfig() is intended to
move stuff into the kernel, not out of it. Better to add a parallel syscall
to go the other way (kind of like we have setxattr/getxattr, sendmsg/recvmsg).
Further, fsinfo() can refer directly to a file/fd/mount/whatever, but
fsconfig() doesn't do that. You have to use fspick() to get a context before
you can use fsconfig(). Now, that's fine if you want to gather several pieces
of information from a particular object, but it's not so good if you want to
get one piece of information from each of several objects.
> ... make it table configured...
I did, kind of (though I didn't call it that). Al rewrote the code to get rid
of it.
David
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