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Re: xfs mknod regression

To: David Chinner <dgc@xxxxxxx>
Subject: Re: xfs mknod regression
From: "Rafael J. Wysocki" <rjw@xxxxxxx>
Date: Thu, 20 Dec 2007 01:04:49 +0100
Cc: Christoph Hellwig <hch@xxxxxxxxxxxxx>, Bret Towe <magnade@xxxxxxxxx>, linux-kernel@xxxxxxxxxxxxxxx, xfs@xxxxxxxxxxx
In-reply-to: <20071219003745.GR4396912@xxxxxxx>
References: <dda83e780712172048n4d40cfcbw4a4d3106fc99f02e@xxxxxxxxxxxxxx> <20071218173642.GA7338@xxxxxxxxxxxxx> <20071219003745.GR4396912@xxxxxxx>
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On Wednesday, 19 of December 2007, David Chinner wrote:
> On Tue, Dec 18, 2007 at 05:36:42PM +0000, Christoph Hellwig wrote:
> > 
> > This was broken by my '[XFS] simplify xfs_create/mknod/symlink prototype',
> > which assigned the re-shuffled ondisk dev_t back to the rdev variable in
> > xfs_vn_mknod.  Because of that i_rdev is set to the ondisk dev_t instead
> > of the linux dev_t later down the function.
> > 
> > Fortunately the fix for it is trivial:  we can just remove the
> > assignment because xfs_revalidate_inode has done the proper job before
> > unlocking the inode.
> > 
> > 
> > Signed-off-by: Christoph Hellwig <hch@xxxxxx>
> > 
> > Index: linux-2.6-xfs/fs/xfs/linux-2.6/xfs_iops.c
> > ===================================================================
> > --- linux-2.6-xfs.orig/fs/xfs/linux-2.6/xfs_iops.c  2007-12-18 
> > 18:23:32.000000000 +0100
> > +++ linux-2.6-xfs/fs/xfs/linux-2.6/xfs_iops.c       2007-12-18 
> > 18:23:43.000000000 +0100
> > @@ -345,9 +345,7 @@ xfs_vn_mknod(
> >             ASSERT(vp);
> >             ip = vn_to_inode(vp);
> >  
> > -           if (S_ISCHR(mode) || S_ISBLK(mode))
> > -                   ip->i_rdev = rdev;
> > -           else if (S_ISDIR(mode))
> > +           if (S_ISDIR(mode))
> >                     xfs_validate_fields(ip);
> >             d_instantiate(dentry, ip);
> >             xfs_validate_fields(dir);
> 
> Thanks for this, Christoph - I'll run some tests on it and check it in.
> 
> Rafael - this is a regression introduced in 2.6.24-rc1 if you want to
> track it.

I do, thanks.

Added to the list, http://bugzilla.kernel.org/show_bug.cgi?id=9608 .
I'll close it when the fix is upstream.

Thanks,
Rafael


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