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Message-ID: <38b2ab8a0807081252v1bd5a2e5xc7c384704c0ae9e6@mail.gmail.com> Date: Tue, 8 Jul 2008 21:52:53 +0200 From: "Francis Moreau" <francis.moro@...il.com> To: "Linux Kernel Mailing List" <linux-kernel@...r.kernel.org> Subject: Trying to use splice from a driver Hello, I'm trying to implement splice ops in a driver, specially the splice_read method. Basically the driver receives data and splice them to a pipe in order to finally move the data to a file. Before receiving the data, the driver allocates a free page by calling alloc_page(). Then it fills it with the data received by the device and then stores the page ref in the splice_pipe_desc structure. Once the structure is initialised the driver calls splice_to_pipe. Now the question is what am I supposed to use for pipe_buf_operations in the splice_pipe_desc structure ? I'm tempted to use 'user_page_pipe_buf_ops' but I'm not sure. Specially for the release method, which points to page_cache_pipe_buf_release(), since the allocated page (the os allocated by the driver) are not coming from the page cache. The same is actually true for vmsplice() where the pages are coming from the user mem space (not from the page cache), so I'm probably missing something... Could aynbody enlight me ? thanks, -- Francis -- 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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