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Date:	Wed, 8 Sep 2010 14:36:55 -0600
From:	Andreas Dilger <adilger@...ger.ca>
To:	Lukas Czerner <lczerner@...hat.com>
Cc:	linux-ext4@...r.kernel.org, rwheeler@...hat.com,
	sandeen@...hat.com, tytso@....edu
Subject: Re: [PATCH 1/5] Add helper function for blkdev_issue_zeroout

On 2010-09-08, at 10:59, Lukas Czerner wrote:
> +static inline int sb_issue_zeroout(struct super_block *sb,
> +				   sector_t block, sector_t nr_blocks)
> +{
> +	block <<= (sb->s_blocksize_bits - 9);
> +	nr_blocks <<= (sb->s_blocksize_bits - 9);
> +	return blkdev_issue_zeroout(sb->s_bdev, block, nr_blocks, GFP_KERNEL,
> +				   BLKDEV_IFL_WAIT | BLKDEV_IFL_BARRIER);
> +}

While I can understand that we might need a barrier for this (to avoid
it being reordered with later writes that are using these blocks), I'm
not sure it needs to wait for previous IO to complete.

Cheers, Andreas





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