diff options
Diffstat (limited to 'mm/backing-dev.c')
| -rw-r--r-- | mm/backing-dev.c | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/mm/backing-dev.c b/mm/backing-dev.c index 847eabe4824c..4967fb176e53 100644 --- a/mm/backing-dev.c +++ b/mm/backing-dev.c @@ -55,6 +55,24 @@ static inline unsigned long get_dirty(struct backing_dev_info *bdi, int i) BDI_SHOW(dirty_kb, K(get_dirty(bdi, 1))) BDI_SHOW(bdi_dirty_kb, K(get_dirty(bdi, 2))) +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; + + 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) + #define __ATTR_RW(attr) __ATTR(attr, 0644, attr##_show, attr##_store) static struct device_attribute bdi_dev_attrs[] = { @@ -63,6 +81,7 @@ static struct device_attribute bdi_dev_attrs[] = { __ATTR_RO(writeback_kb), __ATTR_RO(dirty_kb), __ATTR_RO(bdi_dirty_kb), + __ATTR_RW(min_ratio), __ATTR_NULL, }; @@ -127,6 +146,8 @@ int bdi_init(struct backing_dev_info *bdi) bdi->dev = NULL; + bdi->min_ratio = 0; + for (i = 0; i < NR_BDI_STAT_ITEMS; i++) { err = percpu_counter_init_irq(&bdi->bdi_stat[i], 0); if (err) |