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Re: [PATCH] xfs: remove incorrect assert in xfs_vm_writepage

To: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Subject: Re: [PATCH] xfs: remove incorrect assert in xfs_vm_writepage
From: Alex Elder <aelder@xxxxxxx>
Date: Wed, 10 Nov 2010 15:48:47 -0600
Cc: xfs@xxxxxxxxxxx
In-reply-to: <20101110213911.GA11214@xxxxxxxxxxxxx>
References: <20101110213911.GA11214@xxxxxxxxxxxxx>
Reply-to: aelder@xxxxxxx
On Wed, 2010-11-10 at 16:39 -0500, Christoph Hellwig wrote:
> In commit 20cb52ebd1b5ca6fa8a5d9b6b1392292f5ca8a45, titled
> "xfs: simplify xfs_vm_writepage" I added an assert that any !mapped
> and
> uptodate buffers are not dirty.  That asserts turns out to trigger a
> lot
> when running fsx on filesystems with small block sizes.  The reason
> for
> that is that the assert is simply incorrect.  !mapped and uptodate
> just mean this buffer covers a hole, and whenever we do a
> set_page_dirty
> we mark all blocks in the page dirty, no matter if they have data or
> not.  So remove the assert, and update the comment above the condition
> to match reality.
> Signed-off-by: Christoph Hellwig <hch@xxxxxx>

Looks good.

Reviewed-by: Alex Elder <aelder@xxxxxxx>

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