f2fs: fix to check upper boundary for gc_valid_thresh_ratio

This patch adds missing upper boundary check while setting
gc_valid_thresh_ratio via sysfs.

Fixes: e791d00bd06c ("f2fs: add valid block ratio not to do excessive GC for one time GC")
Cc: Daeho Jeong <daehojeong@google.com>
Signed-off-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

diff --git a/fs/f2fs/sysfs.c b/fs/f2fs/sysfs.c
index 2b5c35ce7b8c7aab4198a06c5ae2663aeb117ce2..d74472d96026a70fb38cbf17d10fe61d6f8846da 100644 (file)
--- a/fs/f2fs/sysfs.c
+++ b/fs/f2fs/sysfs.c
@@ -635,6 +635,13 @@ out:
                return count;
        }
 
+       if (!strcmp(a->attr.name, "gc_valid_thresh_ratio")) {
+               if (t > 100)
+                       return -EINVAL;
+               *ui = (unsigned int)t;
+               return count;
+       }
+
 #ifdef CONFIG_F2FS_IOSTAT
        if (!strcmp(a->attr.name, "iostat_enable")) {
                sbi->iostat_enable = !!t;