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 47b6595a078c58b91ecb73f461758464a3cdb85d..199a77a9c4a9348b1c3fcaf861604db2e4412cf5 100644 (file)
--- 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;
 }