mm: add bdi_set_max_ratio_no_scale() function

This introduces bdi_set_max_ratio_no_scale(). It uses the max
granularity for the ratio. This function by the new sysfs knob
max_ratio_fine.

Link: https://lkml.kernel.org/r/20221119005215.3052436-16-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>

diff --git a/include/linux/backing-dev.h b/include/linux/backing-dev.h
index 572669758c7f898d1bc5586386a12ca4d091ebe9..d9acbb22ff2593141177048b200394871eb1a65e 100644 (file)
--- a/include/linux/backing-dev.h
+++ b/include/linux/backing-dev.h
@@ -109,6 +109,7 @@ u64 bdi_get_min_bytes(struct backing_dev_info *bdi);
 u64 bdi_get_max_bytes(struct backing_dev_info *bdi);
 int bdi_set_min_ratio(struct backing_dev_info *bdi, unsigned int min_ratio);
 int bdi_set_max_ratio(struct backing_dev_info *bdi, unsigned int max_ratio);
+int bdi_set_max_ratio_no_scale(struct backing_dev_info *bdi, unsigned int max_ratio);
 int bdi_set_min_bytes(struct backing_dev_info *bdi, u64 min_bytes);
 int bdi_set_max_bytes(struct backing_dev_info *bdi, u64 max_bytes);
 int bdi_set_strict_limit(struct backing_dev_info *bdi, unsigned int strict_limit);

diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index 3d151e7a9b6c3bd70afd1383042307bad183b604..f44ade72966cbd26e48e0c39366ff462d021645b 100644 (file)
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -719,6 +719,9 @@ static int __bdi_set_max_ratio(struct backing_dev_info *bdi, unsigned int max_ra
 {
        int ret = 0;
 
+       if (max_ratio > 100 * BDI_RATIO_SCALE)
+               return -EINVAL;
+
        spin_lock_bh(&bdi_lock);
        if (bdi->min_ratio > max_ratio) {
                ret = -EINVAL;
@@ -731,6 +734,11 @@ static int __bdi_set_max_ratio(struct backing_dev_info *bdi, unsigned int max_ra
        return ret;
 }
 
+int bdi_set_max_ratio_no_scale(struct backing_dev_info *bdi, unsigned int max_ratio)
+{
+       return __bdi_set_max_ratio(bdi, max_ratio);
+}
+
 int bdi_set_min_ratio(struct backing_dev_info *bdi, unsigned int min_ratio)
 {
        return __bdi_set_min_ratio(bdi, min_ratio * BDI_RATIO_SCALE);
@@ -738,9 +746,6 @@ int bdi_set_min_ratio(struct backing_dev_info *bdi, unsigned int min_ratio)
 
 int bdi_set_max_ratio(struct backing_dev_info *bdi, unsigned int max_ratio)
 {
-       if (max_ratio > 100)
-               return -EINVAL;
-
        return __bdi_set_max_ratio(bdi, max_ratio * BDI_RATIO_SCALE);
 }
 EXPORT_SYMBOL(bdi_set_max_ratio);