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Date: Mon, 10 Sep 2012 16:35:02 -0700 From: Tejun Heo <tj@...nel.org> To: Kent Overstreet <koverstreet@...gle.com>, axboe@...nel.dk, device-mapper development <dm-devel@...hat.com>, david@...morbit.com, linux-kernel@...r.kernel.org, linux-bcache@...r.kernel.org, Mikulas Patocka <mpatocka@...hat.com>, bharrosh@...asas.com, Vivek Goyal <vgoyal@...hat.com> Subject: Re: [dm-devel] [PATCH 2/2] block: Avoid deadlocks with bio allocation by stacking drivers Hello, Alasdair. On Tue, Sep 11, 2012 at 12:09:17AM +0100, Alasdair G Kergon wrote: > On Mon, Sep 10, 2012 at 04:01:01PM -0700, Tejun Heo wrote: > > IIUC, Kent posted a patch which converts all of them to use front-pad > > The only patch I saw posted here only handles one of the easier cases so far. > > The others are a bit trickier and probably involve a decision about which way to > change an in-kernel dm interface. Ah, I see. Thought that was full conversion. I still think this is the right direction to be headed tho. Using multiple mempools from the stacking drivers is way too fragile and difficult to verify and debug. Would it be difficult to convert dm drivers to collect size requirements and use front-pad for all per-bio data? 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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