linux-kernel - Re: [PATCH v7 4/6] block: loop: prepare for supporing direct IO

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Message-ID: <20150727084020.GA28336@infradead.org>
Date:	Mon, 27 Jul 2015 01:40:20 -0700
From:	Christoph Hellwig <hch@...radead.org>
To:	Ming Lei <ming.lei@...onical.com>
Cc:	Jens Axboe <axboe@...nel.dk>, linux-kernel@...r.kernel.org,
	"Justin M. Forbes" <jforbes@...oraproject.org>,
	Jeff Moyer <jmoyer@...hat.com>, Tejun Heo <tj@...nel.org>,
	Christoph Hellwig <hch@...radead.org>,
	linux-api@...r.kernel.org
Subject: Re: [PATCH v7 4/6] block: loop: prepare for supporing direct IO

> +	/*
> +	 * loop block's logical block size is 512, now
> +	 * we support direct I/O only if the backing
> +	 * block devices' minimize I/O size is 512 and
> +	 * the offset is aligned with 512.
> +	 */
> +	if (dio) {
> +		if (inode->i_sb->s_bdev &&
> +			bdev_io_min(inode->i_sb->s_bdev) == 512 &&
> +			!(lo->lo_offset & 511))

Why the hardcoded value?  I suspect this should be more like:

	if (dio && inode->i_sb->s_bdev &&
	    (lo->lo_offset & (bdev_io_min(inode->i_sb->s_bdev) - 1)) != 0)
		dio = false;

> +	blk_mq_freeze_queue(lo->lo_queue);
> +	lo->use_dio = use_dio;
> +	if (use_dio)
> +		lo->lo_flags |= LO_FLAGS_DIRECT_IO;
> +	else
> +		lo->lo_flags &= ~LO_FLAGS_DIRECT_IO;
> +	blk_mq_unfreeze_queue(lo->lo_queue);

Locking?
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