zram: export new 'io_stat' sysfs attrs

Per-device `zram<id>/io_stat' file provides accumulated I/O statistics of
particular zram device in a format similar to block layer statistics.  The
file consists of a single line and represents the following stats
(separated by whitespace):

        failed_reads
        failed_writes
        invalid_io
        notify_free

Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Acked-by: 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>

1 files changed, 20 insertions, 0 deletions

diff --git a/drivers/block/zram/zram_drv.c b/drivers/block/zram/zram_drv.c
index 35dafd9a0350..1b63a717bdbb 100644
--- a/drivers/block/zram/zram_drv.c
+++ b/drivers/block/zram/zram_drv.c
@@ -1033,6 +1033,25 @@ static DEVICE_ATTR_RW(mem_used_max);
 static DEVICE_ATTR_RW(max_comp_streams);
 static DEVICE_ATTR_RW(comp_algorithm);
 
+static ssize_t io_stat_show(struct device *dev,
+                struct device_attribute *attr, char *buf)
+{
+        struct zram *zram = dev_to_zram(dev);
+        ssize_t ret;
+
+        down_read(&zram->init_lock);
+        ret = scnprintf(buf, PAGE_SIZE,
+                        "%8llu %8llu %8llu %8llu\n",
+                        (u64)atomic64_read(&zram->stats.failed_reads),
+                        (u64)atomic64_read(&zram->stats.failed_writes),
+                        (u64)atomic64_read(&zram->stats.invalid_io),
+                        (u64)atomic64_read(&zram->stats.notify_free));
+        up_read(&zram->init_lock);
+
+        return ret;
+}
+
+static DEVICE_ATTR_RO(io_stat);
 ZRAM_ATTR_RO(num_reads);
 ZRAM_ATTR_RO(num_writes);
 ZRAM_ATTR_RO(failed_reads);
@@ -1060,6 +1079,7 @@ static struct attribute *zram_disk_attrs[] = {
         &dev_attr_mem_used_max.attr,
         &dev_attr_max_comp_streams.attr,
         &dev_attr_comp_algorithm.attr,
+        &dev_attr_io_stat.attr,
         NULL,
 };