From: Chao Yu <yuchao0@huawei.com>
Date: Sun, 8 Jul 2018 14:16:53 +0000 (+0800)
Subject: f2fs: detect bug_on in f2fs_wait_discard_bios
X-Git-Tag: v4.19-rc1~57^2~50
X-Git-Url: http://git.osdn.net/view?a=commitdiff_plain;h=2482c4325dfe03b679a8bd7e0f1d14e230f019b3;p=uclinux-h8%2Flinux.git

f2fs: detect bug_on in f2fs_wait_discard_bios

Add bug_on to detect potential non-empty discard wait list.

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

diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index 47b6595a078c..199a77a9c4a9 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -1388,6 +1388,8 @@ bool f2fs_wait_discard_bios(struct f2fs_sb_info *sbi)
 
 	/* just to make sure there is no pending discard commands */
 	__wait_all_discard_cmd(sbi, NULL);
+
+	f2fs_bug_on(sbi, atomic_read(&dcc->discard_cmd_cnt));
 	return dropped;
 }