linux-kernel - [hch: [PATCH] fix FREEZE/THAW compat

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Date:	Thu, 26 Feb 2009 21:32:51 +0100
From:	Christoph Hellwig <hch@....de>
To:	torvalds@...l.org
Cc:	Takashi Sato <t-sato@...jp.nec.com>, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [hch: [PATCH] fix FREEZE/THAW compat_ioctl regression]

[I sent this 10 days ago to lkml and fsdevel and didn't get a single
 reply yet, can we please get this in so we don't have that regression
 in 2.6.29?]


Commit 8e961870bb9804110d5c8211d5d9d500451c4518 removed the FREEZE/THAW
handling in xfs_compat_ioctl but never added any compat handler back, so
now any freeze/thaw request from a 32-bit binary ond 64-bit userspace
will fail.

As these ioctls are 32/64-bit compatible two simple COMPATIBLE_IOCTL
entries in fs/compat_ioctl.c will do the job.


Signed-off-by: Christoph Hellwig <hch@....de>

Index: xfs/fs/compat_ioctl.c
===================================================================
--- xfs.orig/fs/compat_ioctl.c	2009-02-16 12:48:23.000000000 +0000
+++ xfs/fs/compat_ioctl.c	2009-02-16 12:49:34.000000000 +0000
@@ -1913,6 +1913,9 @@
 /* 0x00 */
 COMPATIBLE_IOCTL(FIBMAP)
 COMPATIBLE_IOCTL(FIGETBSZ)
+/* 'X' - originally XFS but some now in the VFS */
+COMPATIBLE_IOCTL(FIFREEZE)
+COMPATIBLE_IOCTL(FITHAW)
 /* RAID */
 COMPATIBLE_IOCTL(RAID_VERSION)
 COMPATIBLE_IOCTL(GET_ARRAY_INFO)

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