linux-kernel - Re: [PATCH v2 3/4] block: loop: introduce 'use

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Message-ID: <20150125133514.GC19445@infradead.org>
Date:	Sun, 25 Jan 2015 05:35:14 -0800
From:	Christoph Hellwig <hch@...radead.org>
To:	Ming Lei <ming.lei@...onical.com>
Cc:	linux-kernel@...r.kernel.org,
	Dave Kleikamp <dave.kleikamp@...cle.com>,
	Jens Axboe <axboe@...nel.dk>, Zach Brown <zab@...bo.net>,
	Christoph Hellwig <hch@...radead.org>,
	Maxim Patlasov <mpatlasov@...allels.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Benjamin LaHaise <bcrl@...ck.org>
Subject: Re: [PATCH v2 3/4] block: loop: introduce 'use_aio' sysfs file

On Tue, Jan 13, 2015 at 11:44:47PM +0800, Ming Lei wrote:
> So that users can control if kernel aio is used to submit I/O.

Why do you want a sysfs flag for this instead of a flags in ->lo_flags
at setup time?  That's how all other loop-related ABI flags work.

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