Date: Sat, 10 Jan 2004 09:13:26 +1300
From: Nigel Cunningham <ncunningham@users.sourceforge.net>
Subject: Re: Swapfiles broken on XFS.
In-reply-to: <20040109161653.A25678@infradead.org>
To: Christoph Hellwig <hch@infradead.org>
Cc: XFS list <linux-xfs@oss.sgi.com>, Karol Kozimor <sziwan@hell.org.pl>,
       swsusp-devel <swsusp-devel@lists.sourceforge.net>,
       Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Reply-to: ncunningham@users.sourceforge.net
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Hi again.

Perhaps I wasn't clear enough.

Both the page_io and Suspend can cope fine with block size < 4096. The
issue is where they get the information from as to how many blocks per
page they actually need to use when called brw_page. At the moment, they
both assume that i_sb->s_blocksize and blocksize_bits is the place to
go. What you're saying sounds right to me. They should both be looking
at i_blkbits and i_blksize in the struct inode, shouldn't they? I'll
make the change, test and submit a patch to LKML.

Regards,

Nigel

On Sat, 2004-01-10 at 05:16, Christoph Hellwig wrote:
> On Fri, Jan 09, 2004 at 04:55:09PM +1300, Nigel Cunningham wrote:
> > It appears to me that a swapfile on an XFS filesystem will not work, at
> > least some of the time.
>=20
> XFS sets s_blocksize to the filesystem blocksize and bdev->bd_block_size =
/
> i_blkbits to the XFS sector size.  The first would be 4096 in your
> case and the latter 512.  We cannot set a bigger device block size becaus=
e
> XFS log writes are in 512b units.
>=20
> I don't think the swap code should do any assumptions about any relation
> of the above two.
--=20
My work on Software Suspend is graciously brought to you by
LinuxFund.org.

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