From: Steve French <smfrench@gmail.com>
Date: Mon, 26 Sep 2016 19:23:08 +0000 (-0500)
Subject: Do not send SMB3 SET_INFO request if nothing is changing
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=18dd8e1a65ddae2351d0f0d6dd4a334f441fc5fa;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git

Do not send SMB3 SET_INFO request if nothing is changing

[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@primarydata.com>
CC: Stable <stable@vger.kernel.org>
---

diff --git a/fs/cifs/smb2inode.c b/fs/cifs/smb2inode.c
index 4f0231e685a9..1238cd3552f9 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);