linux-kernel - [PATCH 4.4 073/112] fs/cifs: keep guid when assigning fid to fileinfo

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Date:   Wed, 26 Oct 2016 14:22:56 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Aurelien Aptel <aaptel@...e.com>,
        Steve French <smfrench@...il.com>
Subject: [PATCH 4.4 073/112] fs/cifs: keep guid when assigning fid to fileinfo

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

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

From: Aurelien Aptel <aaptel@...e.com>

commit 94f873717571c759b7928399cbbddfa3d569bd01 upstream.

When we open a durable handle we give a Globally Unique
Identifier (GUID) to the server which we must keep for later reference
e.g. when reopening persistent handles on reconnection.

Without this the GUID generated for a new persistent handle was lost and
16 zero bytes were used instead on re-opening.

Signed-off-by: Aurelien Aptel <aaptel@...e.com>
Signed-off-by: Steve French <smfrench@...il.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 fs/cifs/smb2ops.c |    1 +
 1 file changed, 1 insertion(+)

--- a/fs/cifs/smb2ops.c
+++ b/fs/cifs/smb2ops.c
@@ -536,6 +536,7 @@ smb2_set_fid(struct cifsFileInfo *cfile,
 	server->ops->set_oplock_level(cinode, oplock, fid->epoch,
 				      &fid->purge_cache);
 	cinode->can_cache_brlcks = CIFS_CACHE_WRITE(cinode);
+	memcpy(cfile->fid.create_guid, fid->create_guid, 16);
 }
 
 static void