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| author | Stefan Roesch <shr@devkernel.io> | 2022-11-18 16:51:57 -0800 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2022-11-30 15:59:03 -0800 |
| commit | 27bbe9d48d4e298864e18b39f091342c68b81637 (patch) | |
| tree | fdfb45b09b3be7acb288ab166bee627e3b904fcc /mm | |
| parent | 8e9d5ead865a1a7af74a444d2f00f1ef4539bfba (diff) | |
| download | linux-stable-27bbe9d48d4e298864e18b39f091342c68b81637.tar.gz linux-stable-27bbe9d48d4e298864e18b39f091342c68b81637.tar.bz2 linux-stable-27bbe9d48d4e298864e18b39f091342c68b81637.zip | |
mm: add knob /sys/class/bdi/<bdi>/strict_limit
Add a new knob to /sys/class/bdi/<bdi>/strict_limit. This new knob
allows to set/unset the flag BDI_CAP_STRICTLIMIT in the bdi
capabilities.
Link: https://lkml.kernel.org/r/20221119005215.3052436-3-shr@devkernel.io
Signed-off-by: Stefan Roesch <shr@devkernel.io>
Cc: Chris Mason <clm@meta.com>
Cc: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/backing-dev.c | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/mm/backing-dev.c b/mm/backing-dev.c index c30419a5e119..a0899cce72ef 100644 --- a/mm/backing-dev.c +++ b/mm/backing-dev.c @@ -209,11 +209,40 @@ static ssize_t stable_pages_required_show(struct device *dev, } static DEVICE_ATTR_RO(stable_pages_required); +static ssize_t strict_limit_store(struct device *dev, + struct device_attribute *attr, const char *buf, size_t count) +{ + struct backing_dev_info *bdi = dev_get_drvdata(dev); + unsigned int strict_limit; + ssize_t ret; + + ret = kstrtouint(buf, 10, &strict_limit); + if (ret < 0) + return ret; + + ret = bdi_set_strict_limit(bdi, strict_limit); + if (!ret) + ret = count; + + return ret; +} + +static ssize_t strict_limit_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct backing_dev_info *bdi = dev_get_drvdata(dev); + + return sysfs_emit(buf, "%d\n", + !!(bdi->capabilities & BDI_CAP_STRICTLIMIT)); +} +static DEVICE_ATTR_RW(strict_limit); + static struct attribute *bdi_dev_attrs[] = { &dev_attr_read_ahead_kb.attr, &dev_attr_min_ratio.attr, &dev_attr_max_ratio.attr, &dev_attr_stable_pages_required.attr, + &dev_attr_strict_limit.attr, NULL, }; ATTRIBUTE_GROUPS(bdi_dev); |