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authorStefan Roesch <shr@devkernel.io>2022-11-19 03:52:13 +0300
committerAndrew Morton <akpm@linux-foundation.org>2022-12-01 02:59:06 +0300
commit2c44af4f2aaa260199f218f11920c406e688693c (patch)
tree451d6696f74f211e895f8e64dc78499de26ca6b7 /mm/page-writeback.c
parent54790f30fea74247e2f38b4a632ee3dc2fe42d86 (diff)
downloadlinux-2c44af4f2aaa260199f218f11920c406e688693c.tar.xz
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 <shr@devkernel.io> Cc: Chris Mason <clm@meta.com> Cc: Jens Axboe <axboe@kernel.dk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'mm/page-writeback.c')
-rw-r--r--mm/page-writeback.c7
1 files changed, 7 insertions, 0 deletions
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);