[RFC PATCH 10/11] ext2: have sync_fs op report writeback errors when passed a since pointer

[Jeff Layton <jlayton@xxxxxxxxxx>]

From: Jeff Layton <jlayton@xxxxxxxxxx>

Signed-off-by: Jeff Layton <jlayton@xxxxxxxxxx>
---
 fs/ext2/super.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/fs/ext2/super.c b/fs/ext2/super.c
index 0700f3264c7e..51b548cfebb1 100644
--- a/fs/ext2/super.c
+++ b/fs/ext2/super.c
@@ -1264,6 +1264,7 @@ void ext2_sync_super(struct super_block *sb, struct ext2_super_block *es,
  */
 static int ext2_sync_fs(struct super_block *sb, int wait, errseq_t *since)
 {
+	int ret;
 	struct ext2_sb_info *sbi = EXT2_SB(sb);
 	struct ext2_super_block *es = EXT2_SB(sb)->s_es;
 
@@ -1280,7 +1281,13 @@ static int ext2_sync_fs(struct super_block *sb, int wait, errseq_t *since)
 	}
 	spin_unlock(&sbi->s_lock);
 	ext2_sync_super(sb, es, wait);
-	return __sync_blockdev(sb->s_bdev, wait);
+	ret = __sync_blockdev(sb->s_bdev, wait);
+	if (since) {
+		int ret2 = errseq_check_and_advance(&sb->s_wb_err, since);
+		if (ret == 0)
+			ret = ret2;
+	}
+	return ret;
 }
 
 static int ext2_freeze(struct super_block *sb)
-- 
2.17.0