linux-kernel - [PATCH AUTOSEL 4.19 20/27] cifs: update ctime and mtime during truncate

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Message-Id: <20200702012615.2701532-20-sashal@kernel.org>
Date:   Wed,  1 Jul 2020 21:26:08 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Zhang Xiaoxu <zhangxiaoxu5@...wei.com>,
        Hulk Robot <hulkci@...wei.com>,
        Steve French <stfrench@...rosoft.com>,
        Sasha Levin <sashal@...nel.org>, linux-cifs@...r.kernel.org,
        samba-technical@...ts.samba.org
Subject: [PATCH AUTOSEL 4.19 20/27] cifs: update ctime and mtime during truncate

From: Zhang Xiaoxu <zhangxiaoxu5@...wei.com>

[ Upstream commit 5618303d8516f8ac5ecfe53ee8e8bc9a40eaf066 ]

As the man description of the truncate, if the size changed,
then the st_ctime and st_mtime fields should be updated. But
in cifs, we doesn't do it.

It lead the xfstests generic/313 failed.

So, add the ATTR_MTIME|ATTR_CTIME flags on attrs when change
the file size

Reported-by: Hulk Robot <hulkci@...wei.com>
Signed-off-by: Zhang Xiaoxu <zhangxiaoxu5@...wei.com>
Signed-off-by: Steve French <stfrench@...rosoft.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 fs/cifs/inode.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/fs/cifs/inode.c b/fs/cifs/inode.c
index 51d410c6f6a47..4a38f16d944db 100644
--- a/fs/cifs/inode.c
+++ b/fs/cifs/inode.c
@@ -2219,6 +2219,15 @@ cifs_set_file_size(struct inode *inode, struct iattr *attrs,
 	if (rc == 0) {
 		cifsInode->server_eof = attrs->ia_size;
 		cifs_setsize(inode, attrs->ia_size);
+
+		/*
+		 * The man page of truncate says if the size changed,
+		 * then the st_ctime and st_mtime fields for the file
+		 * are updated.
+		 */
+		attrs->ia_ctime = attrs->ia_mtime = current_time(inode);
+		attrs->ia_valid |= ATTR_CTIME | ATTR_MTIME;
+
 		cifs_truncate_page(inode->i_mapping, inode->i_size);
 	}
 
-- 
2.25.1