revert "zram: move compact_store() to sysfs functions area"

Revert commit c72c6160d967ed26a0b136dbab337f821d233509

It was intended to be a cosmetic change that w/o any functional change
and was part of a bigger change:

  http://lkml.iu.edu/hypermail/linux/kernel/1503.1/01818.html

Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Nitin Gupta <ngupta@vflare.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/drivers/block/zram/zram_drv.c b/drivers/block/zram/zram_drv.c
index c94386a..8dcbced 100644 (file)
--- 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,