linux-kernel - [PATCH 3.12 51/72] Do not send SMB3 SET

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Message-Id: <4fa275eb0ded4cd7284fb9b5471eab5e4d9cf2bf.1478523828.git.jslaby@suse.cz>
Date:   Mon,  7 Nov 2016 14:04:58 +0100
From:   Jiri Slaby <jslaby@...e.cz>
To:     stable@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, Steve French <smfrench@...il.com>,
        Steve French <steve.french@...marydata.com>,
        Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 51/72] Do not send SMB3 SET_INFO request if nothing is changing

From: Steve French <smfrench@...il.com>

3.12-stable review patch.  If anyone has any objections, please let me know.

===============

commit 18dd8e1a65ddae2351d0f0d6dd4a334f441fc5fa upstream.

[CIFS] We had cases where we sent a SMB2/SMB3 setinfo request with all
timestamp (and DOS attribute) fields marked as 0 (ie do not change)
e.g. on chmod or chown.

Signed-off-by: Steve French <steve.french@...marydata.com>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 fs/cifs/smb2inode.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/fs/cifs/smb2inode.c b/fs/cifs/smb2inode.c
index f970c5d5b253..549676f7b811 100644
--- a/fs/cifs/smb2inode.c
+++ b/fs/cifs/smb2inode.c
@@ -266,9 +266,15 @@ smb2_set_file_info(struct inode *inode, const char *full_path,
 	struct tcon_link *tlink;
 	int rc;
 
+	if ((buf->CreationTime == 0) && (buf->LastAccessTime == 0) &&
+	    (buf->LastWriteTime == 0) && (buf->ChangeTime) &&
+	    (buf->Attributes == 0))
+		return 0; /* would be a no op, no sense sending this */
+
 	tlink = cifs_sb_tlink(cifs_sb);
 	if (IS_ERR(tlink))
 		return PTR_ERR(tlink);
+
 	rc = smb2_open_op_close(xid, tlink_tcon(tlink), cifs_sb, full_path,
 				FILE_WRITE_ATTRIBUTES, FILE_OPEN, 0, buf,
 				SMB2_OP_SET_INFO);
-- 
2.10.2