Date: Wed, 7 Jul 2010 08:57:01 -0400
From: "J. Bruce Fields" <bfields@fieldses.org>
To: Neil Brown <neilb@suse.de>
Cc: Dave Chinner <david@fromorbit.com>,
       "Aneesh Kumar K. V" <aneesh.kumar@linux.vnet.ibm.com>,
       hch@infradead.org, viro@zeniv.linux.org.uk, adilger@sun.com,
       corbet@lwn.net, serue@us.ibm.com, hooanon05@yahoo.co.jp,
       linux-fsdevel@vger.kernel.org, sfrench@us.ibm.com,
       philippe.deniel@CEA.FR, linux-kernel@vger.kernel.org
Subject: Re: [PATCH -V14 0/11] Generic name to handle and open by handle
 syscalls
Message-ID: <20100707125701.GA19872@fieldses.org>
References: <1276621981-2774-1-git-send-email-aneesh.kumar@linux.vnet.ibm.com>
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 <20100702064108.64034561@notabene.brown>
 <87iq4y29a6.fsf@linux.vnet.ibm.com>
 <20100706161002.GD7387@fieldses.org>
 <87eifgfsez.fsf@linux.vnet.ibm.com>
 <20100706232351.GD25018@dastard>
 <20100707093629.10c2feab@notabene.brown>
 <20100707021150.GF25018@dastard>
 <20100707125726.3695587a@notabene.brown>
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On Wed, Jul 07, 2010 at 12:57:26PM +1000, Neil Brown wrote:
> The trouble with /proc/mounts is that it is somewhat clumsy to parse
> (remember to handle \0ctal escapes) and doesn't include major/minor number
> which is the primary key for identifying filesystems in Linux
> (see /sys/class/bdi/MAJOR:MINOR which is e.g. the best place to configure
> read-ahead for a filesystem).
> 
> So /proc/mounts could work (and would probably be better than a new syscall)
> but I would really rather see something sane in /sys for
> inspecting/configuring filesystems (rather than each filesystem doing their
> own independent thing in /sys/fs).

If you use sys or proc, is it possible to get the uuid from a file
descriptor or pathname without races?

--b.
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