There are some missing sysfs entries' description in document, add them.

Signed-off-by: Chao Yu <yuch...@huawei.com>
---
 Documentation/ABI/testing/sysfs-fs-f2fs | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/Documentation/ABI/testing/sysfs-fs-f2fs 
b/Documentation/ABI/testing/sysfs-fs-f2fs
index 11b7f4ebea7c..b7160b29b91d 100644
--- a/Documentation/ABI/testing/sysfs-fs-f2fs
+++ b/Documentation/ABI/testing/sysfs-fs-f2fs
@@ -51,6 +51,12 @@ Description:
                 Controls the dirty page count condition for the in-place-update
                 policies.
 
+What:          /sys/fs/f2fs/<disk>/min_hot_blocks
+Date:          March 2017
+Contact:       "Jaegeuk Kim" <jaeg...@kernel.org>
+Description:
+                Controls the dirty page count condition for redefining hot 
data.
+
 What:          /sys/fs/f2fs/<disk>/max_small_discards
 Date:          November 2013
 Contact:       "Jaegeuk Kim" <jaegeuk....@samsung.com>
@@ -102,6 +108,12 @@ Contact:   "Jaegeuk Kim" <jaeg...@kernel.org>
 Description:
                 Controls the idle timing.
 
+What:          /sys/fs/f2fs/<disk>/iostat_enable
+Date:          August 2017
+Contact:       "Chao Yu" <yuch...@huawei.com>
+Description:
+                Controls to enable/disable IO stat.
+
 What:          /sys/fs/f2fs/<disk>/ra_nid_pages
 Date:          October 2015
 Contact:       "Chao Yu" <chao2...@samsung.com>
@@ -122,6 +134,12 @@ Contact:   "Shuoran Liu" <liushuo...@huawei.com>
 Description:
                 Shows total written kbytes issued to disk.
 
+What:          /sys/fs/f2fs/<disk>/feature
+Date:          July 2017
+Contact:       "Jaegeuk Kim" <jaeg...@kernel.org>
+Description:
+                Shows all enabled features in current device.
+
 What:          /sys/fs/f2fs/<disk>/inject_rate
 Date:          May 2016
 Contact:       "Sheng Yong" <shengyo...@huawei.com>
-- 
2.13.1.388.g69e6b9b4f4a9


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