1 files changed, 23 insertions, 0 deletions

diff --git a/drivers/block/zram/zram_drv.c b/drivers/block/zram/zram_drv.c
index c94386aa563d..8dcbced0eafd 100644
--- a/drivers/block/zram/zram_drv.c
+++ b/drivers/block/zram/zram_drv.c
@@ -74,6 +74,27 @@ static inline struct zram *dev_to_zram(struct device *dev)
         return (struct zram *)dev_to_disk(dev)->private_data;
 }
 
+static ssize_t compact_store(struct device *dev,
+                struct device_attribute *attr, const char *buf, size_t len)
+{
+        unsigned long nr_migrated;
+        struct zram *zram = dev_to_zram(dev);
+        struct zram_meta *meta;
+
+        down_read(&zram->init_lock);
+        if (!init_done(zram)) {
+                up_read(&zram->init_lock);
+                return -EINVAL;
+        }
+
+        meta = zram->meta;
+        nr_migrated = zs_compact(meta->mem_pool);
+        atomic64_add(nr_migrated, &zram->stats.num_migrated);
+        up_read(&zram->init_lock);
+
+        return len;
+}
+
 static ssize_t disksize_show(struct device *dev,
                 struct device_attribute *attr, char *buf)
 {
@@ -1038,6 +1059,7 @@ static const struct block_device_operations zram_devops = {
         .owner = THIS_MODULE
 };
 
+static DEVICE_ATTR_WO(compact);
 static DEVICE_ATTR_RW(disksize);
 static DEVICE_ATTR_RO(initstate);
 static DEVICE_ATTR_WO(reset);
@@ -1114,6 +1136,7 @@ static struct attribute *zram_disk_attrs[] = {
         &dev_attr_num_writes.attr,
         &dev_attr_failed_reads.attr,
         &dev_attr_failed_writes.attr,
+        &dev_attr_compact.attr,
         &dev_attr_invalid_io.attr,
         &dev_attr_notify_free.attr,
         &dev_attr_zero_pages.attr,