/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 *
 * Copyright 2016 Syneto S.R.L. All rights reserved.
 * Copyright 2017 Nexenta Systems, Inc.  All rights reserved.
 * Copyright 2022 RackTop Systems, Inc.
 */

/*
 * The flush SMB is sent to ensure all data and allocation information
 * for the corresponding file has been written to stable storage. This
 * is a synchronous request. The response should not be sent until the
 * writes are complete.
 *
 * The SmbFlush request is described in CIFS/1.0 1996 Section 3.9.14.
 *
 * CIFS/1.0 June 13, 1996
 * Heizer, et al
 * draft-heizer-cifs-v1-spec-00.txt
 */

#include <smbsrv/smb_kproto.h>
#include <smbsrv/smb_fsops.h>


/*
 * smb_com_flush
 *
 * Flush any cached data for a specified file, or for all files that
 * this client has open, to stable storage. If the fid is valid (i.e.
 * not 0xFFFF), we flush only that file. Otherwise we flush all files
 * associated with this client.
 *
 * We need to protect the list because there's a good chance we'll
 * block during the flush operation.
 */
smb_sdrc_t
smb_pre_flush(smb_request_t *sr)
{
        int rc;

        rc = smbsr_decode_vwv(sr, "w", &sr->smb_fid);

        DTRACE_SMB_START(op__Flush, smb_request_t *, sr);

        return ((rc == 0) ? SDRC_SUCCESS : SDRC_ERROR);
}

void
smb_post_flush(smb_request_t *sr)
{
        DTRACE_SMB_DONE(op__Flush, smb_request_t *, sr);
}

smb_sdrc_t
smb_com_flush(smb_request_t *sr)
{
        smb_ofile_t     *file;
        smb_lavl_t      *lavl;
        int             rc;

        if (smb_flush_required == 0) {
                rc = smbsr_encode_empty_result(sr);
                return ((rc == 0) ? SDRC_SUCCESS : SDRC_ERROR);
        }

        if (sr->smb_fid != 0xffff) {
                smbsr_lookup_file(sr);
                if (sr->fid_ofile == NULL) {
                        smbsr_error(sr, NT_STATUS_INVALID_HANDLE,
                            ERRDOS, ERRbadfid);
                        return (SDRC_ERROR);
                }
                smb_ofile_flush(sr, sr->fid_ofile);
        } else {
                lavl = &sr->tid_tree->t_ofile_list;
                smb_lavl_enter(lavl, RW_READER);
                file = smb_lavl_first(lavl);
                while (file) {
                        mutex_enter(&file->f_mutex);
                        smb_ofile_flush(sr, file);
                        mutex_exit(&file->f_mutex);
                        file = smb_lavl_next(lavl, file);
                }
                smb_lavl_exit(lavl);
        }

        rc = smbsr_encode_empty_result(sr);
        return ((rc == 0) ? SDRC_SUCCESS : SDRC_ERROR);
}