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Message-ID: <20120813214654.GD9541@google.com> Date: Mon, 13 Aug 2012 14:46:54 -0700 From: Kent Overstreet <koverstreet@...gle.com> To: Tejun Heo <tj@...nel.org> Cc: linux-bcache@...r.kernel.org, linux-kernel@...r.kernel.org, dm-devel@...hat.com, axboe@...nel.dk, agk@...hat.com, neilb@...e.de, drbd-dev@...ts.linbit.com, vgoyal@...hat.com, mpatocka@...hat.com, sage@...dream.net, yehuda@...newdream.net Subject: Re: [PATCH v5 12/12] block: Only clone bio vecs that are in use On Thu, Aug 09, 2012 at 10:37:00AM -0700, Tejun Heo wrote: > Hello, > > On Mon, Aug 06, 2012 at 03:08:41PM -0700, Kent Overstreet wrote: > > bcache creates large bios internally, and then splits them according to > > the device requirements before it sends them down. If a lower level > > device tries to clone the bio, and the original bio had more than > > BIO_MAX_PAGES, the clone will fail unecessarily. > > > > We can fix this by only cloning the bio vecs that are actually in use. > > How was this tested? This code has been in the bcache tree for months, and I added it to fix a real bug (think I saw it with bcache on top of dm) - and since then it's been tested in probably just about all the relevant configurations, certainly both dm and md. -- 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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