{
int rval;
int i = 0;
- size_t ptr;
- size_t end, end_cur;
- off_t offset;
+ unsigned long pageaddr;
+ unsigned long offset;
+ size_t buflen;
int page_count;
- page_count = PAGE_CACHE_ALIGN(len) >> PAGE_CACHE_SHIFT;
- offset = (off_t) mem - ((off_t)mem & PAGE_CACHE_MASK);
- if (offset && (len > PAGE_CACHE_SIZE))
- page_count++;
+ pageaddr = (unsigned long)mem & PAGE_CACHE_MASK;
+ offset = (unsigned long)mem - pageaddr;
+ buflen = PAGE_CACHE_ALIGN(len + offset);
+ page_count = buflen >> PAGE_CACHE_SHIFT;
/* Free any previous set of page pointers */
if (bp->b_pages)
return rval;
bp->b_offset = offset;
- ptr = (size_t) mem & PAGE_CACHE_MASK;
- end = PAGE_CACHE_ALIGN((size_t) mem + len);
- end_cur = end;
- /* set up first page */
- bp->b_pages[0] = mem_to_page(mem);
-
- ptr += PAGE_CACHE_SIZE;
- bp->b_page_count = ++i;
- while (ptr < end) {
- bp->b_pages[i] = mem_to_page((void *)ptr);
- bp->b_page_count = ++i;
- ptr += PAGE_CACHE_SIZE;
+
+ for (i = 0; i < bp->b_page_count; i++) {
+ bp->b_pages[i] = mem_to_page((void *)pageaddr);
+ pageaddr += PAGE_CACHE_SIZE;
}
bp->b_locked = 0;
- bp->b_count_desired = bp->b_buffer_length = len;
+ bp->b_count_desired = len;
+ bp->b_buffer_length = buflen;
bp->b_flags |= XBF_MAPPED;
return 0;