linux-imx

/*

 *  SMB1 (CIFS) version specific operations

 *

 *  Copyright (c) 2012, Jeff Layton <jlayton@redhat.com>

 *

 *  This library is free software; you can redistribute it and/or modify

 *  it under the terms of the GNU General Public License v2 as published

 *  by the Free Software Foundation.

 *

 *  This library is distributed in the hope that it will be useful,

 *  but WITHOUT ANY WARRANTY; without even the implied warranty of

 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See

 *  the GNU Lesser General Public License for more details.

 *

 *  You should have received a copy of the GNU Lesser General Public License

 *  along with this library; if not, write to the Free Software

 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA

 */

​

#include <linux/pagemap.h>

#include <linux/vfs.h>

#include "cifsglob.h"

#include "cifsproto.h"

#include "cifs_debug.h"

#include "cifspdu.h"

#include "cifs_unicode.h"

​

/*

 * An NT cancel request header looks just like the original request except:

 *

 * The Command is SMB_COM_NT_CANCEL

 * The WordCount is zeroed out

 * The ByteCount is zeroed out

 *

 * This function mangles an existing request buffer into a

 * SMB_COM_NT_CANCEL request and then sends it.

 */

static int

send_nt_cancel(struct TCP_Server_Info *server, struct smb_rqst *rqst,

           struct mid_q_entry *mid)

{

    int rc = 0;

    struct smb_hdr *in_buf = (struct smb_hdr *)rqst->rq_iov[0].iov_base;

​

    /* -4 for RFC1001 length and +2 for BCC field */

    in_buf->smb_buf_length = cpu_to_be32(sizeof(struct smb_hdr) - 4  + 2);

    in_buf->Command = SMB_COM_NT_CANCEL;

    in_buf->WordCount = 0;

    put_bcc(0, in_buf);

​

    mutex_lock(&server->srv_mutex);

    rc = cifs_sign_smb(in_buf, server, &mid->sequence_number);

    if (rc) {

        mutex_unlock(&server->srv_mutex);

        return rc;

    }

​

    /*

     * The response to this call was already factored into the sequence

     * number when the call went out, so we must adjust it back downward

     * after signing here.

     */

    --server->sequence_number;