3863 static void clear_buffer(struct st_buffer * st_bp)  in clear_buffer()  argument
3867 	for (i=0; i < st_bp->frp_segs; i++)  in clear_buffer()
3868 		memset(page_address(st_bp->reserved_pages[i]), 0,  in clear_buffer()
3869 		       PAGE_SIZE << st_bp->reserved_page_order);  in clear_buffer()
3870 	st_bp->cleared = 1;  in clear_buffer()
3892 static int append_to_buffer(const char __user *ubp, struct st_buffer * st_bp, int do_count)  in append_to_buffer()  argument
3895 	int length = PAGE_SIZE << st_bp->reserved_page_order;  in append_to_buffer()
3897 	for (i = 0, offset = st_bp->buffer_bytes;  in append_to_buffer()
3898 	     i < st_bp->frp_segs && offset >= length; i++)  in append_to_buffer()
3900 	if (i == st_bp->frp_segs) {	/* Should never happen */  in append_to_buffer()
3904 	for (; i < st_bp->frp_segs && do_count > 0; i++) {  in append_to_buffer()
3905 		struct page *page = st_bp->reserved_pages[i];  in append_to_buffer()
3911 		st_bp->buffer_bytes += cnt;  in append_to_buffer()
3924 static int from_buffer(struct st_buffer * st_bp, char __user *ubp, int do_count)  in from_buffer()  argument
3927 	int length = PAGE_SIZE << st_bp->reserved_page_order;  in from_buffer()
3929 	for (i = 0, offset = st_bp->read_pointer;  in from_buffer()
3930 	     i < st_bp->frp_segs && offset >= length; i++)  in from_buffer()
3932 	if (i == st_bp->frp_segs) {	/* Should never happen */  in from_buffer()
3936 	for (; i < st_bp->frp_segs && do_count > 0; i++) {  in from_buffer()
3937 		struct page *page = st_bp->reserved_pages[i];  in from_buffer()
3943 		st_bp->buffer_bytes -= cnt;  in from_buffer()
3944 		st_bp->read_pointer += cnt;  in from_buffer()
3956 static void move_buffer_data(struct st_buffer * st_bp, int offset)  in move_buffer_data()  argument
3960 	int length = PAGE_SIZE << st_bp->reserved_page_order;  in move_buffer_data()
3965 	total=st_bp->buffer_bytes - offset;  in move_buffer_data()
3966 	for (src_seg=0; src_seg < st_bp->frp_segs; src_seg++) {  in move_buffer_data()
3973 	st_bp->buffer_bytes = st_bp->read_pointer = total;  in move_buffer_data()
3975 		struct page *dpage = st_bp->reserved_pages[dst_seg];  in move_buffer_data()
3976 		struct page *spage = st_bp->reserved_pages[src_seg];  in move_buffer_data()