From 2c44af4f2aaa260199f218f11920c406e688693c Mon Sep 17 00:00:00 2001 From: Stefan Roesch Date: Fri, 18 Nov 2022 16:52:13 -0800 Subject: mm: add bdi_set_min_ratio_no_scale() function This introduces bdi_set_min_ratio_no_scale(). It uses the max granularity for the ratio. This function by the new sysfs knob min_ratio_fine. Link: https://lkml.kernel.org/r/20221119005215.3052436-19-shr@devkernel.io Signed-off-by: Stefan Roesch Cc: Chris Mason Cc: Jens Axboe Signed-off-by: Andrew Morton --- mm/page-writeback.c | 7 +++++++ 1 file changed, 7 insertions(+) (limited to 'mm/page-writeback.c') diff --git a/mm/page-writeback.c b/mm/page-writeback.c index f44ade72966c..ad608ef2a243 100644 --- a/mm/page-writeback.c +++ b/mm/page-writeback.c @@ -690,6 +690,8 @@ static int __bdi_set_min_ratio(struct backing_dev_info *bdi, unsigned int min_ra unsigned int delta; int ret = 0; + if (min_ratio > 100 * BDI_RATIO_SCALE) + return -EINVAL; min_ratio *= BDI_RATIO_SCALE; spin_lock_bh(&bdi_lock); @@ -734,6 +736,11 @@ static int __bdi_set_max_ratio(struct backing_dev_info *bdi, unsigned int max_ra return ret; } +int bdi_set_min_ratio_no_scale(struct backing_dev_info *bdi, unsigned int min_ratio) +{ + return __bdi_set_min_ratio(bdi, min_ratio); +} + int bdi_set_max_ratio_no_scale(struct backing_dev_info *bdi, unsigned int max_ratio) { return __bdi_set_max_ratio(bdi, max_ratio); -- cgit v1.2.3