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Date: Fri, 12 Oct 2012 01:25:15 +0800
From: Fengguang Wu <fengguang.wu@...el.com>
To: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: linux-kernel@...r.kernel.org
Subject: [GIT PULL] trivial writeback fixes
Hi Linus,
Please pull 3 trivial writeback fixes.
Thanks,
Fengguang
---
The following changes since commit fea7a08acb13524b47711625eebea40a0ede69a0:
Linux 3.6-rc3 (2012-08-22 13:29:06 -0700)
are available in the git repository at:
git://git.kernel.org/pub/scm/linux/kernel/git/wfg/linux.git writeback-for-next
for you to fetch changes up to 2f60d628ffd042e65e0b1d3431fb3e38d6f7c1be:
CPU hotplug, writeback: Don't call writeback_set_ratelimit() too often during hotplug (2012-09-28 20:27:49 +0800)
----------------------------------------------------------------
Namjae Jeon (1):
backing-dev: use kstrto* in preference to simple_strtoul
Srivatsa S. Bhat (1):
CPU hotplug, writeback: Don't call writeback_set_ratelimit() too often during hotplug
Wang Sheng-Hui (1):
writeback: correct comment for move_expired_inodes()
fs/fs-writeback.c | 2 +-
mm/backing-dev.c | 50 ++++++++++++++++++++++++++------------------------
mm/page-writeback.c | 14 +++++++++++---
3 files changed, 38 insertions(+), 28 deletions(-)
diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c
index be3efc4..fd255c0 100644
--- a/fs/fs-writeback.c
+++ b/fs/fs-writeback.c
@@ -248,7 +248,7 @@ static bool inode_dirtied_after(struct inode *inode, unsigned long t)
}
/*
- * Move expired (dirtied after work->older_than_this) dirty inodes from
+ * Move expired (dirtied before work->older_than_this) dirty inodes from
* @delaying_queue to @dispatch_queue.
*/
static int move_expired_inodes(struct list_head *delaying_queue,
diff --git a/mm/backing-dev.c b/mm/backing-dev.c
index b41823c..d3ca2b3 100644
--- a/mm/backing-dev.c
+++ b/mm/backing-dev.c
@@ -158,16 +158,16 @@ static ssize_t read_ahead_kb_store(struct device *dev,
const char *buf, size_t count)
{
struct backing_dev_info *bdi = dev_get_drvdata(dev);
- char *end;
unsigned long read_ahead_kb;
- ssize_t ret = -EINVAL;
+ ssize_t ret;
- read_ahead_kb = simple_strtoul(buf, &end, 10);
- if (*buf && (end[0] == '\0' || (end[0] == '\n' && end[1] == '\0'))) {
- bdi->ra_pages = read_ahead_kb >> (PAGE_SHIFT - 10);
- ret = count;
- }
- return ret;
+ ret = kstrtoul(buf, 10, &read_ahead_kb);
+ if (ret < 0)
+ return ret;
+
+ bdi->ra_pages = read_ahead_kb >> (PAGE_SHIFT - 10);
+
+ return count;
}
#define K(pages) ((pages) << (PAGE_SHIFT - 10))
@@ -187,16 +187,17 @@ static ssize_t min_ratio_store(struct device *dev,
struct device_attribute *attr, const char *buf, size_t count)
{
struct backing_dev_info *bdi = dev_get_drvdata(dev);
- char *end;
unsigned int ratio;
- ssize_t ret = -EINVAL;
+ ssize_t ret;
+
+ ret = kstrtouint(buf, 10, &ratio);
+ if (ret < 0)
+ return ret;
+
+ ret = bdi_set_min_ratio(bdi, ratio);
+ if (!ret)
+ ret = count;
- ratio = simple_strtoul(buf, &end, 10);
- if (*buf && (end[0] == '\0' || (end[0] == '\n' && end[1] == '\0'))) {
- ret = bdi_set_min_ratio(bdi, ratio);
- if (!ret)
- ret = count;
- }
return ret;
}
BDI_SHOW(min_ratio, bdi->min_ratio)
@@ -205,16 +206,17 @@ static ssize_t max_ratio_store(struct device *dev,
struct device_attribute *attr, const char *buf, size_t count)
{
struct backing_dev_info *bdi = dev_get_drvdata(dev);
- char *end;
unsigned int ratio;
- ssize_t ret = -EINVAL;
+ ssize_t ret;
+
+ ret = kstrtouint(buf, 10, &ratio);
+ if (ret < 0)
+ return ret;
+
+ ret = bdi_set_max_ratio(bdi, ratio);
+ if (!ret)
+ ret = count;
- ratio = simple_strtoul(buf, &end, 10);
- if (*buf && (end[0] == '\0' || (end[0] == '\n' && end[1] == '\0'))) {
- ret = bdi_set_max_ratio(bdi, ratio);
- if (!ret)
- ret = count;
- }
return ret;
}
BDI_SHOW(max_ratio, bdi->max_ratio)
diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index 5ad5ce2..830893b 100644
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -1602,10 +1602,18 @@ void writeback_set_ratelimit(void)
}
static int __cpuinit
-ratelimit_handler(struct notifier_block *self, unsigned long u, void *v)
+ratelimit_handler(struct notifier_block *self, unsigned long action,
+ void *hcpu)
{
- writeback_set_ratelimit();
- return NOTIFY_DONE;
+
+ switch (action & ~CPU_TASKS_FROZEN) {
+ case CPU_ONLINE:
+ case CPU_DEAD:
+ writeback_set_ratelimit();
+ return NOTIFY_OK;
+ default:
+ return NOTIFY_DONE;
+ }
}
static struct notifier_block __cpuinitdata ratelimit_nb = {
--
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