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Message-ID: <20111019162902.GA25124@google.com> Date: Wed, 19 Oct 2011 09:29:02 -0700 From: Tejun Heo <tj@...nel.org> To: Vivek Goyal <vgoyal@...hat.com> Cc: axboe@...nel.dk, linux-kernel@...r.kernel.org, ctalbott@...gle.com, rni@...gle.com Subject: Re: [PATCH 02/10] block: fix genhd refcounting in blkio_policy_parse_and_set() Hello, On Wed, Oct 19, 2011 at 09:26:57AM -0400, Vivek Goyal wrote: > What's the advantage of collapsing blkio_check_dev_num(). Why not put the > reference to gendisk in this function before returning either success or > failure. Heh, at first, I just thought there would be something which depends on disk still being around in the code path as unsynchronized one time check upfront doesn't really guarantee anything; then, I realized there was nothing, but I still left it like that because I personally think blkio_check_dev_num() w/o surrounding exclusion is a bad interface. It's at best opportunistic and likely to mislead people into believing that there's some magical implied synchronization. Also, I'm planning on cleaning up synchronization around iocg and for it to work properly, it'll be necessary to do proper ref counting and removal on release anyway. Thanks. -- tejun -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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