1547 	struct st_buffer *STbp = STp->buffer;  in setup_buffering()  local
1556 		i = sgl_map_user_pages(STbp, STbp->use_sg, (unsigned long)buf,  in setup_buffering()
1559 			STbp->do_dio = i;  in setup_buffering()
1560 			STbp->buffer_bytes = 0;   /* can be used as transfer counter */  in setup_buffering()
1563 			STbp->do_dio = 0;  /* fall back to buffering with any error */  in setup_buffering()
1564 		STbp->sg_segs = STbp->do_dio;  in setup_buffering()
1566 		     if (STbp->do_dio) {  in setup_buffering()
1568 			STp->nbr_pages += STbp->do_dio;  in setup_buffering()
1572 		STbp->do_dio = 0;  in setup_buffering()
1575 	if (!STbp->do_dio) {  in setup_buffering()
1583 			if (is_read && STp->sili && !STbp->cleared)  in setup_buffering()
1584 				clear_buffer(STbp);  in setup_buffering()
1587 		if (bufsize > STbp->buffer_size &&  in setup_buffering()
1588 		    !enlarge_buffer(STbp, bufsize)) {  in setup_buffering()
1596 			STbp->buffer_blocks = bufsize / STp->block_size;  in setup_buffering()
1607 	struct st_buffer *STbp;  in release_buffering()  local
1609 	STbp = STp->buffer;  in release_buffering()
1610 	if (STbp->do_dio) {  in release_buffering()
1611 		sgl_unmap_user_pages(STbp, STbp->do_dio, is_read);  in release_buffering()
1612 		STbp->do_dio = 0;  in release_buffering()
1613 		STbp->sg_segs = 0;  in release_buffering()
1633 	struct st_buffer *STbp;  in st_write()  local
1681 	STbp = STp->buffer;  in st_write()
1703 	    !STbp->do_dio &&  in st_write()
1725 		if (STbp->do_dio) {  in st_write()
1732 				do_count = STbp->buffer_blocks * STp->block_size -  in st_write()
1733 					STbp->buffer_bytes;  in st_write()
1738 			i = append_to_buffer(b_point, STbp, do_count);  in st_write()
1747 		async_write = STp->block_size == 0 && !STbp->do_dio &&  in st_write()
1752 		    STbp->buffer_bytes < STbp->buffer_size) {  in st_write()
1763 			if (!STbp->do_dio)  in st_write()
1764 				blks = STbp->buffer_bytes;  in st_write()
1778 			retval = STbp->syscall_result;  in st_write()
1781 		if (async_write && !STbp->syscall_result) {  in st_write()
1782 			STbp->writing = transfer;  in st_write()
1783 			STp->dirty = !(STbp->writing ==  in st_write()
1784 				       STbp->buffer_bytes);  in st_write()
1790 		if (STbp->syscall_result != 0) {  in st_write()
1856 				retval = STbp->syscall_result;  in st_write()
1868 		STbp->buffer_bytes = 0;  in st_write()
1907 	struct st_buffer *STbp;  in read_tape()  local
1917 	STbp = STp->buffer;  in read_tape()
1927 			if (!STbp->do_dio && bytes > (STp->buffer)->buffer_size)  in read_tape()
1950 		return STbp->syscall_result;  in read_tape()
1952 	STbp->read_pointer = 0;  in read_tape()
1956 	if (STbp->syscall_result) {  in read_tape()
1995 						STbp->buffer_bytes = 0;  in read_tape()
1998 						STbp->buffer_bytes = bytes - transfer;  in read_tape()
2012 						STbp->buffer_bytes = (blks - transfer) *  in read_tape()
2018 							    STbp->buffer_bytes);  in read_tape()
2030 						STbp->buffer_bytes = 0;  in read_tape()
2032 						STbp->buffer_bytes =  in read_tape()
2036 						    STbp->buffer_bytes);  in read_tape()
2043 						STbp->buffer_bytes = bytes - transfer;  in read_tape()
2045 						STbp->buffer_bytes =  in read_tape()
2050 						    STbp->buffer_bytes);  in read_tape()
2067 			if (STbp->buffer_bytes < 0)  /* Caused by bogus sense data */  in read_tape()
2068 				STbp->buffer_bytes = 0;  in read_tape()
2072 			retval = STbp->syscall_result;  in read_tape()
2078 		STbp->buffer_bytes = bytes;  in read_tape()
2080 			STbp->buffer_bytes -= STp->buffer->cmdstat.residual;  in read_tape()
2087 			STps->drv_block += STbp->buffer_bytes / STp->block_size;  in read_tape()
2105 	struct st_buffer *STbp = STp->buffer;  in st_read()  local
2134 			  STps->eof, STbp->buffer_bytes);  in st_read()
2140 	do_dio = STbp->do_dio;  in st_read()
2142 	if (STbp->buffer_bytes == 0 &&  in st_read()
2172 		if (STbp->buffer_bytes == 0) {  in st_read()
2181 		if (STbp->buffer_bytes > 0) {  in st_read()
2186 					  STps->eof, STbp->buffer_bytes,  in st_read()
2189 			transfer = STbp->buffer_bytes < count - total ?  in st_read()
2190 			    STbp->buffer_bytes : count - total;  in st_read()
2192 				i = from_buffer(STbp, buf, transfer);  in st_read()
2233 		STbp->buffer_bytes = 0;  in st_read()
4861 static int sgl_map_user_pages(struct st_buffer *STbp,  in sgl_map_user_pages()  argument
4870 	struct rq_map_data *mdata = &STbp->map_data;  in sgl_map_user_pages()
4905 	STbp->mapped_pages = pages;  in sgl_map_user_pages()
4919 static int sgl_unmap_user_pages(struct st_buffer *STbp,  in sgl_unmap_user_pages()  argument
4923 	unpin_user_pages_dirty_lock(STbp->mapped_pages, nr_pages, dirtied);  in sgl_unmap_user_pages()
4925 	kfree(STbp->mapped_pages);  in sgl_unmap_user_pages()
4926 	STbp->mapped_pages = NULL;  in sgl_unmap_user_pages()