[PATCH 3.16 119/306] Do not send SMB3 SET_INFO request if nothing is changing

Ben Hutchings
2017-02-15T23:16:35Z

From: Steve French <smfrench@gmail.com>

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@primarydata.com>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
fs/cifs/smb2inode.c | 6 ++++++
1 file changed, 6 insertions(+)

--- a/fs/cifs/smb2inode.c
+++ b/fs/cifs/smb2inode.c
@@ -266,9 +266,15 @@ smb2_set_file_info(struct inode *inode,
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);