commit 846ae671ad368e344a2b141c0f19e1014b27a0dd
author Chao Yu <yuchao0@huawei.com> Mon Feb 26 22:04:13 2018 +0800
committer Jaegeuk Kim <jaegeuk@kernel.org> Tue Mar 13 08:05:48 2018 +0900
tree b220f05ab079e37343b841d368a58916388149ab
parent 17cd07ae95073c298af92c1ba14ac58ce84de33b

f2fs: expose extension_list sysfs entry

This patch adds a sysfs entry 'extension_list' to support
query/add/del item in extension list.

Query:
cat /sys/fs/f2fs/<device>/extension_list

Add:
echo 'extension' > /sys/fs/f2fs/<device>/extension_list

Del:
echo '!extension' > /sys/fs/f2fs/<device>/extension_list

Signed-off-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

fs/f2fs/super.c

diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index d2833a2..06da158 100644
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -2222,7 +2222,7 @@ static void init_sb_info(struct f2fs_sb_info *sbi)
 	sbi->dirty_device = 0;
 	spin_lock_init(&sbi->dev_lock);
 
-	mutex_init(&sbi->sb_lock);
+	init_rwsem(&sbi->sb_lock);
 }
 
 static int init_percpu_info(struct f2fs_sb_info *sbi)