Commit 30d3c128 authored Oct 20, 2011 by Ian Campbell Committed by David S. Miller Oct 20, 2011

mm: add a "struct page_frag" type containing a page, offset and length



A few network drivers currently use skb_frag_struct for this purpose but I have
patches which add additional fields and semantics there which these other uses
do not want.

A structure for reference sub-page regions seems like a generally useful thing
so do so instead of adding a network subsystem specific structure.

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
Acked-by: Jens Axboe <jaxboe@fusionio.com>
Acked-by: David Rientjes <rientjes@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

parent 90278c9f

include/linux/mm_types.h

+11 −0

Original line number	Diff line number	Diff line
		@@ -135,6 +135,17 @@ struct page {
		#endif
		;

		struct page_frag {
		struct page *page;
		#if (BITS_PER_LONG > 32) \|\| (PAGE_SIZE >= 65536)
		__u32 offset;
		__u32 size;
		#else
		__u16 offset;
		__u16 size;
		#endif
		};

		typedef unsigned long __nocast vm_flags_t;

		/*

Admin message