Patch "SMB3: Don't ignore O_SYNC/O_DSYNC and O_DIRECT flags" has been added to the 4.4-stable tree

[<gregkh@linuxfoundation.org>]

This is a note to let you know that I've just added the patch titled

    SMB3: Don't ignore O_SYNC/O_DSYNC and O_DIRECT flags

to the 4.4-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     smb3-don-t-ignore-o_sync-o_dsync-and-o_direct-flags.patch
and it can be found in the queue-4.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 1013e760d10e614dc10b5624ce9fc41563ba2e65 Mon Sep 17 00:00:00 2001
From: Steve French <smfrench@gmail.com>
Date: Fri, 22 Sep 2017 01:40:27 -0500
Subject: SMB3: Don't ignore O_SYNC/O_DSYNC and O_DIRECT flags

From: Steve French <smfrench@gmail.com>

commit 1013e760d10e614dc10b5624ce9fc41563ba2e65 upstream.

Signed-off-by: Steve French <smfrench@gmail.com>
Reviewed-by: Ronnie Sahlberg <lsahlber@redhat.com>
Reviewed-by: Pavel Shilovsky <pshilov@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 fs/cifs/file.c |    7 +++++++
 1 file changed, 7 insertions(+)

--- a/fs/cifs/file.c
+++ b/fs/cifs/file.c
@@ -224,6 +224,13 @@ cifs_nt_open(char *full_path, struct ino
 	if (backup_cred(cifs_sb))
 		create_options |= CREATE_OPEN_BACKUP_INTENT;
 
+	/* O_SYNC also has bit for O_DSYNC so following check picks up either */
+	if (f_flags & O_SYNC)
+		create_options |= CREATE_WRITE_THROUGH;
+
+	if (f_flags & O_DIRECT)
+		create_options |= CREATE_NO_BUFFER;
+
 	oparms.tcon = tcon;
 	oparms.cifs_sb = cifs_sb;
 	oparms.desired_access = desired_access;


Patches currently in stable-queue which might be from smfrench@gmail.com are

queue-4.4/smb3-don-t-ignore-o_sync-o_dsync-and-o_direct-flags.patch
queue-4.4/fix-smb3.1.1-guest-authentication-to-samba.patch
queue-4.4/cifs-release-auth_key.response-for-reconnect.patch
queue-4.4/smb-validate-negotiate-to-protect-against-downgrade-even-if-signing-off.patch