linux-ext4 - Re: [PATCH] ext4: Fix delalloc sync hang with journal lock inversion

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Date:	Mon, 2 Jun 2008 11:35:00 +0200
From:	Jan Kara <jack@...e.cz>
To:	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
Cc:	cmm@...ibm.com, linux-ext4@...r.kernel.org
Subject: Re: [PATCH] ext4: Fix delalloc sync hang with journal lock
	inversion

> @@ -1052,6 +1051,7 @@ static int __mpage_da_writepage(struct page *page,
>  		head = page_buffers(page);
>  		bh = head;
>  		do {
> +
  I guess this line is a typo.

>  			BUG_ON(buffer_locked(bh));
>  			if (buffer_dirty(bh))
>  				mpage_add_bh_to_extent(mpd, logical, bh);
> diff --git a/mm/page-writeback.c b/mm/page-writeback.c
> index 789b6ad..655b8bf 100644
> --- a/mm/page-writeback.c
> +++ b/mm/page-writeback.c
> @@ -881,7 +881,12 @@ int write_cache_pages(struct address_space *mapping,
>  	pagevec_init(&pvec, 0);
>  	if (wbc->range_cyclic) {
>  		index = mapping->writeback_index; /* Start from prev offset */
> -		end = -1;
> +		/*
> +		 * write only till the specified range_end even in cyclic mode
> +		 */
> +		end = wbc->range_end >> PAGE_CACHE_SHIFT;
> +		if (!end)
> +			end = -1;
>  	} else {
>  		index = wbc->range_start >> PAGE_CACHE_SHIFT;
>  		end = wbc->range_end >> PAGE_CACHE_SHIFT;
  Are you sure you won't break other users of range_cyclic with this
change?

									Honza
-- 
Jan Kara <jack@...e.cz>
SUSE Labs, CR
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