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Message-Id: <20090803162255.c6d12eda.akpm@linux-foundation.org>
Date: Mon, 3 Aug 2009 16:22:55 -0700
From: Andrew Morton <akpm@...ux-foundation.org>
To: Mark Lord <lkml@....ca>
Cc: sandeen@...hat.com, linux-kernel@...r.kernel.org,
linux-ext4@...r.kernel.org, sandeen@...deen.net,
Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH] fs/compat_ioctl.c: add missing FS_IOC_FIEMAP support
On Mon, 03 Aug 2009 18:07:53 -0400
Mark Lord <lkml@....ca> wrote:
> Eric Sandeen wrote:
> > Mark Lord wrote:
> >> (resending, no ack from anyone first time around).
> >
> > I had previously sent a fix for this to the ext4 list as well, although
> > w/o the added case for compat_ioctl or the extra #include.
> >
> > Because this ioctl should be 100% compat everywhere, I don't -think-
> > it's needed, and
> >
> > http://marc.info/?l=linux-ext4&m=124872536713005&w=2
mutter. I don't read linux-fsdevel much.
> > suffices....
> ..
>
> Well, whichever of the two works best for the maintainers.
>
> We need *something* for it upstream, and probably back in -stable too.
> Otherwise this prevents using 64-bit kernels on 32-bit userland,
> as Linus likes to recommend so often. ;)
OK, here's what I have, with a somewhat reworked changelog.
I assumed that "Josef" == josef@...hat.com.
Arnd, could you please check that it still looks OK?
Thanks.
From: Eric Sandeen <sandeen@...hat.com>
The FIEMAP_IOC_FIEMAP mapping ioctl was missing a 32-bit compat handler,
which means that 32-bit suerspace on 64-bit kernels cannot use this ioctl
command.
The structure is nicely aligned, padded, and sized, so it is just this
simple.
Tested w/ 32-bit ioctl tester (from Josef) on a 64-bit kernel on ext4.
Signed-off-by: Eric Sandeen <sandeen@...hat.com>
Cc: <linux-ext4@...r.kernel.org>
Cc: Mark Lord <lkml@....ca>
Cc: Arnd Bergmann <arnd@...db.de>
Cc: Josef Bacik <josef@...hat.com>
Cc: Jan Kara <jack@...e.cz>
Cc: <stable@...nel.org>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
---
fs/compat_ioctl.c | 1 +
1 file changed, 1 insertion(+)
diff -puN fs/compat_ioctl.c~compat_ioctl-hook-up-compat-handler-for-fiemap-ioctl fs/compat_ioctl.c
--- a/fs/compat_ioctl.c~compat_ioctl-hook-up-compat-handler-for-fiemap-ioctl
+++ a/fs/compat_ioctl.c
@@ -1838,6 +1838,7 @@ COMPATIBLE_IOCTL(FIONCLEX)
COMPATIBLE_IOCTL(FIOASYNC)
COMPATIBLE_IOCTL(FIONBIO)
COMPATIBLE_IOCTL(FIONREAD) /* This is also TIOCINQ */
+COMPATIBLE_IOCTL(FS_IOC_FIEMAP)
/* 0x00 */
COMPATIBLE_IOCTL(FIBMAP)
COMPATIBLE_IOCTL(FIGETBSZ)
_
--
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