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Date: Mon, 9 Nov 2009 17:03:11 -0600 From: David Teigland <teigland@...hat.com> To: Andrew Morton <akpm@...ux-foundation.org> Cc: Thadeu Lima de Souza Cascardo <cascardo@...oscopio.com>, cluster-devel@...hat.com, device@...ana.org, gregkh@...e.de, linux-kernel@...r.kernel.org, rubini@...ion.unipv.it Subject: Re: [Cluster-devel] Re: [PATCH] misc: use a proper range for minor number dynamic allocation On Mon, Nov 09, 2009 at 01:28:36PM -0800, Andrew Morton wrote: > On Fri, 23 Oct 2009 21:28:17 -0200 > Thadeu Lima de Souza Cascardo <cascardo@...oscopio.com> wrote: > > > The current dynamic allocation of minor number for misc devices has some > > drawbacks. > > > > First of all, the range for dynamic numbers include some statically > > allocated numbers. It goes from 63 to 0, and we have numbers in the > > range from 1 to 15 already allocated. Although, it gives priority to the > > higher and not allocated numbers, we may end up in a situation where we > > must reject registering a driver which got a static number because a > > driver got its number with dynamic allocation. Considering fs/dlm/user.c > > allocates as many misc devices as lockspaces are created, and that we > > have more than 50 users around, it's not unreasonable to reach that > > situation. > > What is this DLM behaviour of which you speak? It sounds broken. One for each userland lockspace, I know of three userland apps using dlm: 1. rgmanager which is at the end of its life 2. clvmd which is switching to a different lock manager 3. ocfs2 tools, where the userland portion is transient; it only exists while the tool executes. That said, it shouldn't be a problem to switch to a single device in the next version of the interface. Dave -- 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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