linux-ext4 - Re: [PATCH 1/2] ext4: Fix BUG_ON in ext4_da_block

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Date:	Wed, 16 Mar 2011 14:02:02 -0700
From:	Curt Wohlgemuth <curtw@...gle.com>
To:	Jan Kara <jack@...e.cz>
Cc:	tytso@....edu, linux-ext4@...r.kernel.org
Subject: Re: [PATCH 1/2] ext4: Fix BUG_ON in ext4_da_block_invalidatepages()

Hi Jan:

This problem was fixed by the patch I sent on 18 Feb, titled

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

I guess this didn't make it into 2.6.38, but it's in the ext4 patch queue now.

Thanks,
Curt

On Wed, Mar 16, 2011 at 1:52 PM, Jan Kara <jack@...e.cz> wrote:
> When an allocation of blocks fails in mpage_da_map_and_submit() e.g. because of
> EIO we call ext4_da_block_invalidatepages() to invalidate pages we cannot write
> but we fail to set mpd->io_done. Thus we continue searching for dirty pages and
> add them to the current extent in mpd structure. Eventually we try to allocate
> blocks for the extent again and strange things start happening. In particular
> if the allocation fails again, we try to invalidate pages again and that
> triggers BUG_ON in ext4_da_block_invalidatepages().
>
> Fix the issue by setting mpd->io_done after the pages are invalidated.
>
> Signed-off-by: Jan Kara <jack@...e.cz>
> ---
>  fs/ext4/inode.c |    1 +
>  1 files changed, 1 insertions(+), 0 deletions(-)
>
> diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
> index 9f7f9e4..337d9ca 100644
> --- a/fs/ext4/inode.c
> +++ b/fs/ext4/inode.c
> @@ -2314,6 +2314,7 @@ static void mpage_da_map_and_submit(struct mpage_da_data *mpd)
>                /* invalidate all the pages */
>                ext4_da_block_invalidatepages(mpd, next,
>                                mpd->b_size >> mpd->inode->i_blkbits);
> +               mpd->io_done = 1;
>                return;
>        }
>        BUG_ON(blks == 0);
> --
> 1.7.1
>
> --
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