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>

diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h
index 774b895..29971a5 100644 (file)
--- a/include/linux/mm_types.h
+++ b/include/linux/mm_types.h
@@ -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;
 
 /*