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

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Message-Id: <1211479817.8596.42.camel@BVR-FS.beaverton.ibm.com>
Date:	Thu, 22 May 2008 11:10:17 -0700
From:	Mingming <cmm@...ibm.com>
To:	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
Cc:	tytso@....edu, sandeen@...hat.com, linux-ext4@...r.kernel.org
Subject: Re: [PATCH] ext4: Fix delalloc sync hang with journal lock
	inversion


On Wed, 2008-05-21 at 23:14 +0530, Aneesh Kumar K.V wrote:
> Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@...ux.vnet.ibm.com>
> ---
>  fs/ext4/inode.c |   10 +++++++---
>  1 files changed, 7 insertions(+), 3 deletions(-)
> 
> diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
> index 46cc610..076d00f 100644
> --- a/fs/ext4/inode.c
> +++ b/fs/ext4/inode.c
> @@ -1571,13 +1571,17 @@ static int ext4_da_writepages(struct address_space *mapping,
>  		 */
>  		if (wbc->nr_to_write > EXT4_MAX_WRITEBACK_PAGES)
>  			wbc->nr_to_write = EXT4_MAX_WRITEBACK_PAGES;
> -		to_write -= wbc->nr_to_write;
> 
> +		to_write -= wbc->nr_to_write;
>  		ret = mpage_da_writepages(mapping, wbc, ext4_da_get_block_write);
>  		ext4_journal_stop(handle);
> -		to_write +=wbc->nr_to_write;
> +		if (wbc->nr_to_write) {
> +			/* We failed to write what we requested for */
> +			to_write += wbc->nr_to_write;
> +			break;
> +		}

Not sure about the break here...
> +		wbc->nr_to_write = to_write;

Looks right. thanks.

>  	}
> -
>  out_writepages:
>  	wbc->nr_to_write = to_write;
>  	wbc->range_cyclic = range_cyclic;

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