linux-kernel - Re: [PATCH 07/25] r/o bind mounts: elevate write count for some ioctls

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Date:	Fri, 21 Sep 2007 16:47:54 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Dave Hansen <haveblue@...ibm.com>
Cc:	linux-kernel@...r.kernel.org, hch@...radead.org
Subject: Re: [PATCH 07/25] r/o bind mounts: elevate write count for some
 ioctls

On Fri, 21 Sep 2007 16:39:40 -0700
Dave Hansen <haveblue@...ibm.com> wrote:

> On Fri, 2007-09-21 at 16:03 -0700, Andrew Morton wrote:
> > Dave Hansen <haveblue@...ibm.com> wrote:
> > 
> > > Some ioctl()s can cause writes to the filesystem.  Take
> > > these, and make them use mnt_want/drop_write() instead.
> > > 
> > > We need to pass the filp one layer deeper in XFS, but
> > > somebody _just_ pulled it out in February because nobody
> > > was using it, so I don't feel guilty for adding it back.
> > 
> > Note that -mm's ext2-reservations.patch adds EXT2_IOC_SETRSVSZ,
> > and it doesn't do mnt_want_write().
> 
> That doesn't quite apply to mainline (at least after the patches I just
> sent).  I'll wait and send you one on top of the next -mm so that I can
> get a coherent view of what's going on if that's all right.
> 

Sure, that's OK.

But I only noticed it because I happened to have my nose in there fixing a
reject.

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