linux-ext4 - Re: [RFC PATCH] mark buffer_head mapping preallocate area as new during write

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Date:	Tue, 28 Apr 2009 09:50:49 +0530
From:	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
To:	Mingming Cao <cmm@...ibm.com>
Cc:	tytso@....edu, sandeen@...hat.com, linux-ext4@...r.kernel.org
Subject: Re: [RFC PATCH] mark buffer_head mapping preallocate area as new
	during write_begin with delayed allocation

On Mon, Apr 27, 2009 at 04:04:54PM -0700, Mingming Cao wrote:
.....

> 
> Index: linux-2.6.28-rc6/fs/ext4/inode.c
> ===================================================================
> --- linux-2.6.28-rc6.orig/fs/ext4/inode.c	2009-03-12 10:21:05.000000000 -0700
> +++ linux-2.6.28-rc6/fs/ext4/inode.c	2009-04-27 14:35:21.000000000 -0700
> @@ -2177,7 +2177,10 @@ static int ext4_da_get_block_prep(struct
>  		set_buffer_new(bh_result);
>  		set_buffer_delay(bh_result);
>  	} else if (ret > 0) {
> +		if (buffer_unwritten(bh_result))
> +			set_buffer_new(bh_result);
>  		bh_result->b_size = (ret << inode->i_blkbits);
> +		bh_result->b_bdev = inode->i_sb->s_bdev;


Updated patch to set bh_result->b_dev. I also added comments in the
source to explain whey we need to mark buffer_head new. Also updated
single line patch summary. I will send the update (-v2) patch.

-aneesh
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