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@xxxxxxxxxx>
Cc: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Cc: Jens Axboe <jaxboe@xxxxxxxxxxxx>
Cc: linux-mm@xxxxxxxxx
Cc: linux-kernel@xxxxxxxxxxxxxxx
[since v1: s/struct subpage/struct page_frag/ on advice from Christoph]
---
include/linux/mm_types.h | 11 +++++++++++
1 files changed, 11 insertions(+), 0 deletions(-)
diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h
index 774b895..575faaf 100644
--- 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 page_offset;
+ __u32 size;
+#else
+ __u16 page_offset;
+ __u16 size;
+#endif
+};
+
typedef unsigned long __nocast vm_flags_t;
/*
--
1.7.2.5
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