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    Subject[PATCH] mm: add a "struct page_frag" type containing a page, offset and length
    Date
    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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