Commit a258234c authored by Stefan Roesch's avatar Stefan Roesch Committed by Yifan Qiao
Browse files

mm: add bdi_set_min_bytes() function 

mainline inclusion
from mainline-v6.2-rc1
commit 803c9805
category: feature
bugzilla: https://gitee.com/src-openeuler/kernel/issues/IAN96I

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=803c98050569850be5fd51a2025c67622de887d9

--------------------------------

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.

Link: https://lkml.kernel.org/r/20221119005215.3052436-13-shr@devkernel.io


Signed-off-by: default avatarStefan Roesch <shr@devkernel.io>
Cc: Chris Mason <clm@meta.com>
Cc: Jens Axboe <axboe@kernel.dk>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarYifan Qiao <qiaoyifan4@huawei.com>
parent 633fbe32

include/linux/backing-dev.h

+1 −0
Original line number Diff line number Diff line
@@ -111,6 +111,7 @@ 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_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);

mm/page-writeback.c

+14 −0
Original line number Diff line number Diff line
@@ -783,6 +783,20 @@ u64 bdi_get_min_bytes(struct backing_dev_info *bdi) 
	return bdi_get_bytes(bdi->min_ratio);

}



int bdi_set_min_bytes(struct backing_dev_info *bdi, u64 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);

}



u64 bdi_get_max_bytes(struct backing_dev_info *bdi)

{

	return bdi_get_bytes(bdi->max_ratio);