Re: [PATCH 07/25] r/o bind mounts: elevate write count for someioctls

[Andrew Morton]

On Thu, 20 Sep 2007 12:52:57 -0700
Dave Hansen <haveblue@xxxxxxxxxx> 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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