This introduces the bdi_set_min_bytes() function. The min_bytes function
does not store the min_bytes value. Instead it converts the min_bytes
value into the corresponding ratio value.
Signed-off-by: Stefan Roesch <shr@xxxxxxxxxxxx>
---
include/linux/backing-dev.h | 1 +
mm/page-writeback.c | 15 +++++++++++++++
2 files changed, 16 insertions(+)
diff --git a/include/linux/backing-dev.h b/include/linux/backing-dev.h
index 621329f25bbe..659e9cb8c643 100644
--- a/include/linux/backing-dev.h
+++ b/include/linux/backing-dev.h
@@ -109,6 +109,7 @@ unsigned long long bdi_get_min_bytes(struct backing_dev_info *bdi);
unsigned long long 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_min_bytes(struct backing_dev_info *bdi, unsigned long long min_bytes);
int bdi_set_max_bytes(struct backing_dev_info *bdi, unsigned long long 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 07f59ed60d4a..ca6cbf8e63bb 100644
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -751,6 +751,21 @@ unsigned long long bdi_get_min_bytes(struct backing_dev_info *bdi)
}
EXPORT_SYMBOL_GPL(bdi_get_min_bytes);
+int bdi_set_min_bytes(struct backing_dev_info *bdi, unsigned long long min_bytes)
+{
+ int ret;
+ unsigned long pages = min_bytes >> PAGE_SHIFT;
+ unsigned long min_ratio;
+
+ ret = bdi_check_pages_limit(pages);
+ if (ret)
+ return ret;
+
+ min_ratio = bdi_ratio_from_pages(pages);
+ return __bdi_set_min_ratio(bdi, min_ratio);
+}
+EXPORT_SYMBOL_GPL(bdi_set_min_bytes);
+
unsigned long long bdi_get_max_bytes(struct backing_dev_info *bdi)
{
return bdi_get_bytes(bdi->max_ratio);
--
2.30.2
