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Message-ID: <20090608070503.GB11363@kernel.dk> Date: Mon, 8 Jun 2009 09:05:04 +0200 From: Jens Axboe <jens.axboe@...cle.com> To: Leon Woestenberg <leon.woestenberg@...il.com> Cc: Steve Rottinger <steve@...tek.com>, linux-kernel@...r.kernel.org Subject: Re: splice methods in character device driver On Sat, Jun 06 2009, Leon Woestenberg wrote: > Hello Jens, > > in the spirit of splice-and-dice I continue asking questions until I grasp this. > > On Mon, May 11, 2009 at 9:22 PM, Jens Axboe<jens.axboe@...cle.com> wrote: > > So if your design is allocating the pages in the ->splice_read() > > handler and initiating IO to these pages, then you need to provide a > > suitable ->confirm() hook that can wait on this IO to complete if > > needed. > > When the driver's splice_read() is called, the kernel wants the driver to > allocate pages and later check that they are filled with data through the > confirm() hook. Is that correct? Correct. > How can I pass information from the splice_read(), which spawns a hardware > DMA to the pages in my case, to the confirm() hook which is called at some > (random) time in the future? There's a ->private for each pipe_buffer, so you can pass along info on a per-page granularity. -- Jens Axboe -- 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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