667 	struct st_buffer *STbuffer;  in write_behind_check()  local
672 	STbuffer = STp->buffer;  in write_behind_check()
673 	if (!STbuffer->writing)  in write_behind_check()
684 	SRpnt = STbuffer->last_SRpnt;  in write_behind_check()
685 	STbuffer->last_SRpnt = NULL;  in write_behind_check()
691 	STbuffer->buffer_bytes -= STbuffer->writing;  in write_behind_check()
697 			STps->drv_block += STbuffer->writing / STp->block_size;  in write_behind_check()
700 	cmdstatp = &STbuffer->cmdstat;  in write_behind_check()
701 	if (STbuffer->syscall_result) {  in write_behind_check()
715 	STbuffer->writing = 0;  in write_behind_check()
720 				STbuffer->cmdstat.midlevel_result, retval);) /* end DEB */  in write_behind_check()
3896 static int enlarge_buffer(struct st_buffer * STbuffer, int new_size)  in enlarge_buffer()  argument
3901 	if (new_size <= STbuffer->buffer_size)  in enlarge_buffer()
3904 	if (STbuffer->buffer_size <= PAGE_SIZE)  in enlarge_buffer()
3905 		normalize_buffer(STbuffer);  /* Avoid extra segment */  in enlarge_buffer()
3907 	max_segs = STbuffer->use_sg;  in enlarge_buffer()
3911 	if (STbuffer->cleared)  in enlarge_buffer()
3914 	if (STbuffer->frp_segs) {  in enlarge_buffer()
3915 		order = STbuffer->reserved_page_order;  in enlarge_buffer()
3923 		STbuffer->reserved_page_order = order;  in enlarge_buffer()
3928 		normalize_buffer(STbuffer);  in enlarge_buffer()
3929 		return enlarge_buffer(STbuffer, new_size);  in enlarge_buffer()
3932 	for (segs = STbuffer->frp_segs, got = STbuffer->buffer_size;  in enlarge_buffer()
3938 			DEB(STbuffer->buffer_size = got);  in enlarge_buffer()
3939 			normalize_buffer(STbuffer);  in enlarge_buffer()
3943 		STbuffer->frp_segs += 1;  in enlarge_buffer()
3945 		STbuffer->buffer_size = got;  in enlarge_buffer()
3946 		STbuffer->reserved_pages[segs] = page;  in enlarge_buffer()
3949 	STbuffer->b_data = page_address(STbuffer->reserved_pages[0]);  in enlarge_buffer()
3968 static void normalize_buffer(struct st_buffer * STbuffer)  in normalize_buffer()  argument
3970 	int i, order = STbuffer->reserved_page_order;  in normalize_buffer()
3972 	for (i = 0; i < STbuffer->frp_segs; i++) {  in normalize_buffer()
3973 		__free_pages(STbuffer->reserved_pages[i], order);  in normalize_buffer()
3974 		STbuffer->buffer_size -= (PAGE_SIZE << order);  in normalize_buffer()
3976 	STbuffer->frp_segs = 0;  in normalize_buffer()
3977 	STbuffer->sg_segs = 0;  in normalize_buffer()
3978 	STbuffer->reserved_page_order = 0;  in normalize_buffer()
3979 	STbuffer->map_data.offset = 0;  in normalize_buffer()