zc.h

   1 /* For zero copy */
   2 int __get_userbuf(uint8_t __user *addr, uint32_t len, int write,
   3                 int pgcount, struct page **pg, struct scatterlist *sg,
   4                 struct task_struct *task, struct mm_struct *mm);
   5 void release_user_pages(struct page **pg, int pagecount);
   6
   7 /* last page - first page + 1 */
   8 #define PAGECOUNT(buf, buflen) \
   9         ((((unsigned long)(buf + buflen - 1) & PAGE_MASK) >> PAGE_SHIFT) - \
  10         (((unsigned long) buf               & PAGE_MASK) >> PAGE_SHIFT) + 1)
  11
  12 #define DEFAULT_PREALLOC_PAGES 32