Messages in this thread Patch in this message | | | From | Ian Campbell <> | Subject | [PATCH] mm: add a "struct page_frag" type containing a page, offset and length | Date | Thu, 13 Oct 2011 11:02:56 +0100 |
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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> Cc: Christoph Hellwig <hch@infradead.org> Cc: Jens Axboe <jaxboe@fusionio.com> Cc: linux-mm@kvack.org Cc: linux-kernel@vger.kernel.org [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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