linux-kernel - [PATCH 3.16 040/204] SMB3: Don't ignore O_SYNC/O_DSYNC and O

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Date:   Thu, 28 Dec 2017 17:05:44 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org,
        "Pavel Shilovsky" <pshilov@...rosoft.com>,
        "Steve French" <smfrench@...il.com>,
        "Ronnie Sahlberg" <lsahlber@...hat.com>
Subject: [PATCH 3.16 040/204] SMB3: Don't ignore O_SYNC/O_DSYNC and
 O_DIRECT flags

3.16.52-rc1 review patch.  If anyone has any objections, please let me know.

------------------

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

commit 1013e760d10e614dc10b5624ce9fc41563ba2e65 upstream.

Signed-off-by: Steve French <smfrench@...il.com>
Reviewed-by: Ronnie Sahlberg <lsahlber@...hat.com>
Reviewed-by: Pavel Shilovsky <pshilov@...rosoft.com>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 fs/cifs/file.c | 7 +++++++
 1 file changed, 7 insertions(+)

--- a/fs/cifs/file.c
+++ b/fs/cifs/file.c
@@ -225,6 +225,13 @@ 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;