3809 static void clear_buffer(struct st_buffer * st_bp)  in clear_buffer()  argument
3813 	for (i=0; i < st_bp->frp_segs; i++)  in clear_buffer()
3814 		memset(page_address(st_bp->reserved_pages[i]), 0,  in clear_buffer()
3815 		       PAGE_SIZE << st_bp->reserved_page_order);  in clear_buffer()
3816 	st_bp->cleared = 1;  in clear_buffer()
3838 static int append_to_buffer(const char __user *ubp, struct st_buffer * st_bp, int do_count)  in append_to_buffer()  argument
3841 	int length = PAGE_SIZE << st_bp->reserved_page_order;  in append_to_buffer()
3843 	for (i = 0, offset = st_bp->buffer_bytes;  in append_to_buffer()
3844 	     i < st_bp->frp_segs && offset >= length; i++)  in append_to_buffer()
3846 	if (i == st_bp->frp_segs) {	/* Should never happen */  in append_to_buffer()
3850 	for (; i < st_bp->frp_segs && do_count > 0; i++) {  in append_to_buffer()
3851 		struct page *page = st_bp->reserved_pages[i];  in append_to_buffer()
3857 		st_bp->buffer_bytes += cnt;  in append_to_buffer()
3870 static int from_buffer(struct st_buffer * st_bp, char __user *ubp, int do_count)  in from_buffer()  argument
3873 	int length = PAGE_SIZE << st_bp->reserved_page_order;  in from_buffer()
3875 	for (i = 0, offset = st_bp->read_pointer;  in from_buffer()
3876 	     i < st_bp->frp_segs && offset >= length; i++)  in from_buffer()
3878 	if (i == st_bp->frp_segs) {	/* Should never happen */  in from_buffer()
3882 	for (; i < st_bp->frp_segs && do_count > 0; i++) {  in from_buffer()
3883 		struct page *page = st_bp->reserved_pages[i];  in from_buffer()
3889 		st_bp->buffer_bytes -= cnt;  in from_buffer()
3890 		st_bp->read_pointer += cnt;  in from_buffer()
3902 static void move_buffer_data(struct st_buffer * st_bp, int offset)  in move_buffer_data()  argument
3906 	int length = PAGE_SIZE << st_bp->reserved_page_order;  in move_buffer_data()
3911 	total=st_bp->buffer_bytes - offset;  in move_buffer_data()
3912 	for (src_seg=0; src_seg < st_bp->frp_segs; src_seg++) {  in move_buffer_data()
3919 	st_bp->buffer_bytes = st_bp->read_pointer = total;  in move_buffer_data()
3921 		struct page *dpage = st_bp->reserved_pages[dst_seg];  in move_buffer_data()
3922 		struct page *spage = st_bp->reserved_pages[src_seg];  in move_buffer_data()