diff options
| -rw-r--r-- | drivers/md/raid5.c | 44 | ||||
| -rw-r--r-- | drivers/md/raid5.h | 1 |
2 files changed, 45 insertions, 0 deletions
diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c index c82ce1fd8723..f78b1964543b 100644 --- a/drivers/md/raid5.c +++ b/drivers/md/raid5.c @@ -5880,6 +5880,49 @@ raid5_stripecache_size = __ATTR(stripe_cache_size, S_IRUGO | S_IWUSR, raid5_store_stripe_cache_size); static ssize_t +raid5_show_rmw_level(struct mddev *mddev, char *page) +{ + struct r5conf *conf = mddev->private; + if (conf) + return sprintf(page, "%d\n", conf->rmw_level); + else + return 0; +} + +static ssize_t +raid5_store_rmw_level(struct mddev *mddev, const char *page, size_t len) +{ + struct r5conf *conf = mddev->private; + unsigned long new; + + if (!conf) + return -ENODEV; + + if (len >= PAGE_SIZE) + return -EINVAL; + + if (kstrtoul(page, 10, &new)) + return -EINVAL; + + if (new != PARITY_DISABLE_RMW && !raid6_call.xor_syndrome) + return -EINVAL; + + if (new != PARITY_DISABLE_RMW && + new != PARITY_ENABLE_RMW && + new != PARITY_PREFER_RMW) + return -EINVAL; + + conf->rmw_level = new; + return len; +} + +static struct md_sysfs_entry +raid5_rmw_level = __ATTR(rmw_level, S_IRUGO | S_IWUSR, + raid5_show_rmw_level, + raid5_store_rmw_level); + + +static ssize_t raid5_show_preread_threshold(struct mddev *mddev, char *page) { struct r5conf *conf; @@ -6065,6 +6108,7 @@ static struct attribute *raid5_attrs[] = { &raid5_preread_bypass_threshold.attr, &raid5_group_thread_cnt.attr, &raid5_skip_copy.attr, + &raid5_rmw_level.attr, NULL, }; static struct attribute_group raid5_attrs_group = { diff --git a/drivers/md/raid5.h b/drivers/md/raid5.h index 57fef9ba36fa..6614ac5ffc0e 100644 --- a/drivers/md/raid5.h +++ b/drivers/md/raid5.h @@ -362,6 +362,7 @@ enum { enum { PARITY_DISABLE_RMW = 0, PARITY_ENABLE_RMW, + PARITY_PREFER_RMW, }; /* |