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

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Message-Id: <20070921160314.67b116ed.akpm@linux-foundation.org>
Date:	Fri, 21 Sep 2007 16:03:14 -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 Thu, 20 Sep 2007 12:52:57 -0700
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().
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