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mm-add-knob-sys-class-bdi-bdi-max_bytes.patch removed from -mm tree

merged mm-stable Andrew Morton 1 participant 1 message Dec 1, 2022

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The quilt patch titled
Subject: mm: add knob /sys/class/bdi/<bdi>/max_bytes
has been removed from the -mm tree. Its filename was
mm-add-knob-sys-class-bdi-bdi-max_bytes.patch

This patch was dropped because it was merged into the mm-stable branch of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

------------------------------------------------------
From: Stefan Roesch <[email protected]>
Subject: mm: add knob /sys/class/bdi/<bdi>/max_bytes
Date: Fri, 18 Nov 2022 16:52:03 -0800

This adds the new knob max_bytes to specify a dirty memory limit for the corresponding bdi. The specified bytes value is converted to a ratio.

Link https://lkml.kernel.org/r/[email protected] open here
Signed-off-by Stefan Roesch <[email protected]>
Cc Chris Mason <[email protected]>
Cc Jens Axboe <[email protected]>
Signed-off-by Andrew Morton <[email protected]>

---

 mm/backing-dev.c |   29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)
mm/backing-dev.c renamed from mm/backing-dev.c~mm-add-knob-sys-class-bdi-bdi-max_bytes +29 -0
@@ -199,6 +199,34 @@ static ssize_t max_ratio_store(struct de
 }
 BDI_SHOW(max_ratio, bdi->max_ratio / BDI_RATIO_SCALE)
 
+static ssize_t max_bytes_show(struct device *dev,
+			      struct device_attribute *attr,
+			      char *buf)
+{
+	struct backing_dev_info *bdi = dev_get_drvdata(dev);
+
+	return sysfs_emit(buf, "%llu\n", bdi_get_max_bytes(bdi));
+}
+
+static ssize_t max_bytes_store(struct device *dev,
+		struct device_attribute *attr, const char *buf, size_t count)
+{
+	struct backing_dev_info *bdi = dev_get_drvdata(dev);
+	u64 bytes;
+	ssize_t ret;
+
+	ret = kstrtoull(buf, 10, &bytes);
+	if (ret < 0)
+		return ret;
+
+	ret = bdi_set_max_bytes(bdi, bytes);
+	if (!ret)
+		ret = count;
+
+	return ret;
+}
+DEVICE_ATTR_RW(max_bytes);
+
 static ssize_t stable_pages_required_show(struct device *dev,
 					  struct device_attribute *attr,
 					  char *buf)

@@ -241,6 +269,7 @@ static struct attribute *bdi_dev_attrs[]
 	&dev_attr_read_ahead_kb.attr,
 	&dev_attr_min_ratio.attr,
 	&dev_attr_max_ratio.attr,
+	&dev_attr_max_bytes.attr,
 	&dev_attr_stable_pages_required.attr,
 	&dev_attr_strict_limit.attr,
 	NULL,

_

Patches currently in -mm which might be from [email protected] are