linux-kernel - [PATCH AUTOSEL 5.16 22/42] vfs: make sync_filesystem return errors from ->sync

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Message-Id: <20220209183335.46545-22-sashal@kernel.org>
Date:   Wed,  9 Feb 2022 13:32:54 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     "Darrick J. Wong" <djwong@...nel.org>, Jan Kara <jack@...e.cz>,
        Christoph Hellwig <hch@....de>,
        Christian Brauner <brauner@...nel.org>,
        Sasha Levin <sashal@...nel.org>, viro@...iv.linux.org.uk,
        linux-fsdevel@...r.kernel.org
Subject: [PATCH AUTOSEL 5.16 22/42] vfs: make sync_filesystem return errors from ->sync_fs

From: "Darrick J. Wong" <djwong@...nel.org>

[ Upstream commit 5679897eb104cec9e99609c3f045a0c20603da4c ]

Strangely, sync_filesystem ignores the return code from the ->sync_fs
call, which means that syscalls like syncfs(2) never see the error.
This doesn't seem right, so fix that.

Signed-off-by: Darrick J. Wong <djwong@...nel.org>
Reviewed-by: Jan Kara <jack@...e.cz>
Reviewed-by: Christoph Hellwig <hch@....de>
Acked-by: Christian Brauner <brauner@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 fs/sync.c | 18 ++++++++++++------
 1 file changed, 12 insertions(+), 6 deletions(-)

diff --git a/fs/sync.c b/fs/sync.c
index 3ce8e2137f310..c7690016453e4 100644
--- a/fs/sync.c
+++ b/fs/sync.c
@@ -29,7 +29,7 @@
  */
 int sync_filesystem(struct super_block *sb)
 {
-	int ret;
+	int ret = 0;
 
 	/*
 	 * We need to be protected against the filesystem going from
@@ -52,15 +52,21 @@ int sync_filesystem(struct super_block *sb)
 	 * at a time.
 	 */
 	writeback_inodes_sb(sb, WB_REASON_SYNC);
-	if (sb->s_op->sync_fs)
-		sb->s_op->sync_fs(sb, 0);
+	if (sb->s_op->sync_fs) {
+		ret = sb->s_op->sync_fs(sb, 0);
+		if (ret)
+			return ret;
+	}
 	ret = sync_blockdev_nowait(sb->s_bdev);
-	if (ret < 0)
+	if (ret)
 		return ret;
 
 	sync_inodes_sb(sb);
-	if (sb->s_op->sync_fs)
-		sb->s_op->sync_fs(sb, 1);
+	if (sb->s_op->sync_fs) {
+		ret = sb->s_op->sync_fs(sb, 1);
+		if (ret)
+			return ret;
+	}
 	return sync_blockdev(sb->s_bdev);
 }
 EXPORT_SYMBOL(sync_filesystem);
-- 
2.34.1