linux-ext4 - Re: [PATCH 1/2] ext4: mark multi-page IO complete on mapping failure

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Date:	Sat, 26 Feb 2011 13:54:05 -0500
From:	Ted Ts'o <tytso@....edu>
To:	Curt Wohlgemuth <curtw@...gle.com>
Cc:	linux-ext4@...r.kernel.org
Subject: Re: [PATCH 1/2] ext4: mark multi-page IO complete on mapping
 failure

On Fri, Feb 18, 2011 at 01:31:38PM -0800, Curt Wohlgemuth wrote:
> In mpage_da_map_and_submit(), if we have a delayed block
> allocation failure from ext4_map_blocks(), we need to mark
> the IO as complete, by setting
> 
>       mpd->io_done = 1;
> 
> Otherwise, we could end up submitting the pages in an outer
> loop; since they are unlocked on mapping failure in
> ext4_da_block_invalidatepages(), this will cause a bug check
> in mpage_da_submit_io().
> 
> I tested this by injected failures into ext4_map_blocks().
> Without this patch, a simple fsstress run will bug check;
> with the patch, it works fine.
> 
> Signed-off-by: Curt Wohlgemuth <curtw@...gle.com>

Thanks, added to the ext4 patch queue.

					- Ted
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