linux-master/mm/page-writeback.c

188 	unsigned long tot_bw = atomic_long_read(&wb->bdi->tot_write_bandwidth);
189 	unsigned long long min = wb->bdi->min_ratio;
190 	unsigned long long max = wb->bdi->max_ratio;
241 	*minp = wb->bdi->min_ratio;
242 	*maxp = wb->bdi->max_ratio;
585 			       wb->bdi->max_prop_frac, nr);
590 				       wb->bdi->max_prop_frac, nr);
688 static int __bdi_set_min_ratio(struct backing_dev_info *bdi, unsigned int min_ratio)
697 	if (min_ratio > bdi->max_ratio) {
700 		if (min_ratio < bdi->min_ratio) {
701 			delta = bdi->min_ratio - min_ratio;
703 			bdi->min_ratio = min_ratio;
705 			delta = min_ratio - bdi->min_ratio;
708 				bdi->min_ratio = min_ratio;
719 static int __bdi_set_max_ratio(struct backing_dev_info *bdi, unsigned int max_ratio)
727 	if (bdi->min_ratio > max_ratio) {
730 		bdi->max_ratio = max_ratio;
731 		bdi->max_prop_frac = (FPROP_FRAC_BASE * max_ratio) /
739 int bdi_set_min_ratio_no_scale(struct backing_dev_info *bdi, unsigned int min_ratio)
741 	return __bdi_set_min_ratio(bdi, min_ratio);
744 int bdi_set_max_ratio_no_scale(struct backing_dev_info *bdi, unsigned int max_ratio)
746 	return __bdi_set_max_ratio(bdi, max_ratio);
749 int bdi_set_min_ratio(struct backing_dev_info *bdi, unsigned int min_ratio)
751 	return __bdi_set_min_ratio(bdi, min_ratio * BDI_RATIO_SCALE);
754 int bdi_set_max_ratio(struct backing_dev_info *bdi, unsigned int max_ratio)
756 	return __bdi_set_max_ratio(bdi, max_ratio * BDI_RATIO_SCALE);
760 u64 bdi_get_min_bytes(struct backing_dev_info *bdi)
762 	return bdi_get_bytes(bdi->min_ratio);
765 int bdi_set_min_bytes(struct backing_dev_info *bdi, u64 min_bytes)
776 	return __bdi_set_min_ratio(bdi, min_ratio);
779 u64 bdi_get_max_bytes(struct backing_dev_info *bdi)
781 	return bdi_get_bytes(bdi->max_ratio);
784 int bdi_set_max_bytes(struct backing_dev_info *bdi, u64 max_bytes)
795 	return __bdi_set_max_ratio(bdi, max_ratio);
798 int bdi_set_strict_limit(struct backing_dev_info *bdi, unsigned int strict_limit)
805 		bdi->capabilities |= BDI_CAP_STRICTLIMIT;
807 		bdi->capabilities &= ~BDI_CAP_STRICTLIMIT;
856  * bounded by the bdi->min_ratio and/or bdi->max_ratio parameters, if set.
929  * (o) global/bdi setpoints
1033 	 * This is especially important for fuse which sets bdi->max_ratio to
1040 	 * total amount of RAM is 16GB, bdi->max_ratio is equal to 1%, global
1053 	if (unlikely(wb->bdi->capabilities & BDI_CAP_STRICTLIMIT)) {
1086 		 * with bdi->max_ratio == 100%.
1224 					&wb->bdi->tot_write_bandwidth) <= 0);
1400 	if (unlikely(wb->bdi->capabilities & BDI_CAP_STRICTLIMIT)) {
1687 	struct backing_dev_info *bdi = wb->bdi;
1688 	bool strictlimit = bdi->capabilities & BDI_CAP_STRICTLIMIT;
1924 		bdi->last_bdp_sleep = jiffies;
1996 	struct backing_dev_info *bdi = inode_to_bdi(inode);
2002 	if (!(bdi->capabilities & BDI_CAP_WRITEBACK))
2006 		wb = wb_get_create_current(bdi, GFP_KERNEL);
2008 		wb = &bdi->wb;
2183 	struct backing_dev_info *bdi;
2187 	list_for_each_entry_rcu(bdi, &bdi_list, bdi_list)
2188 		del_timer(&bdi->laptop_mode_wb_timer);
3006 		struct backing_dev_info *bdi = inode_to_bdi(inode);
3013 		if (bdi->capabilities & BDI_CAP_WRITEBACK_ACCT) {
3051 		struct backing_dev_info *bdi = inode_to_bdi(inode);
3062 		if (bdi->capabilities & BDI_CAP_WRITEBACK_ACCT) {