netdev - Re: [PATCH 6/6] fs: Introduce kern_mount

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20081127101023.GA1454@infradead.org>
Date:	Thu, 27 Nov 2008 05:10:23 -0500
From:	Christoph Hellwig <hch@...radead.org>
To:	Eric Dumazet <dada1@...mosbay.com>
Cc:	Christoph Hellwig <hch@...radead.org>, Ingo Molnar <mingo@...e.hu>,
	David Miller <davem@...emloft.net>,
	"Rafael J. Wysocki" <rjw@...k.pl>, linux-kernel@...r.kernel.org,
	kernel-testers@...r.kernel.org, Mike Galbraith <efault@....de>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Linux Netdev List <netdev@...r.kernel.org>,
	Christoph Lameter <cl@...ux-foundation.org>
Subject: Re: [PATCH 6/6] fs: Introduce kern_mount_special() to mount
	special vfs

On Thu, Nov 27, 2008 at 11:04:38AM +0100, Eric Dumazet wrote:
> Hum.. we have a superblock flag already, but testing it in mntput()/mntget()
> is going to be a litle bit expensive if we add a derefence ?
>
> if (mnt && mnt->mnt_sb->s_flags & MS_SPECIAL) {
>   ...
> }

Well, run a benchmark to see if it makes any difference.  And when it
does please always set the mount flag from the common mount code when
it's set on the superblock, and document that this is the only valid way
to set it.

--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html