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Date: Wed, 10 Feb 2010 16:02:14 +0100 From: Miklos Szeredi <miklos@...redi.hu> To: Tejun Heo <tj@...nel.org> CC: miklos@...redi.hu, mszeredi@...e.cz, linux-kernel@...r.kernel.org, fuse-devel@...ts.sourceforge.net, polynomial-c@...too.org, akpm@...ux-foundation.org Subject: Re: [fuse-devel] [PATCH] FUSE/CUSE: implement direct mmap support On Wed, 10 Feb 2010, Tejun Heo wrote: > > When does that happen? Can it happen that two mappings of the same > > file descriptor will have different backing pages? > > Yeah, sure. FUSE server is free to give them separate regions. The > only restriction is the SHMLBA alignment which is pretty easy to > adhere to. What I really meant was: does it ever happen that mapping a *single open file* of a chardev twice will result in two different maps? Or will the maps be only different if it was a different open of the device? If there's a pattern there, we might make the sharing/non-sharing automated, and greatly simplify the interface. Thanks, Miklos -- 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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