1/*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21/*
22 * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
23 * Use is subject to license terms.
24 *
25 * Copyright 2016 Syneto S.R.L. All rights reserved.
26 * Copyright 2017 Nexenta Systems, Inc.  All rights reserved.
27 */
28
29/*
30 * The flush SMB is sent to ensure all data and allocation information
31 * for the corresponding file has been written to stable storage. This
32 * is a synchronous request. The response should not be sent until the
33 * writes are complete.
34 *
35 * The SmbFlush request is described in CIFS/1.0 1996 Section 3.9.14.
36 *
37 * CIFS/1.0 June 13, 1996
38 * Heizer, et al
39 * draft-heizer-cifs-v1-spec-00.txt
40 */
41
42#include <smbsrv/smb_kproto.h>
43#include <smbsrv/smb_fsops.h>
44
45
46/*
47 * smb_com_flush
48 *
49 * Flush any cached data for a specified file, or for all files that
50 * this client has open, to stable storage. If the fid is valid (i.e.
51 * not 0xFFFF), we flush only that file. Otherwise we flush all files
52 * associated with this client.
53 *
54 * We need to protect the list because there's a good chance we'll
55 * block during the flush operation.
56 */
57smb_sdrc_t
58smb_pre_flush(smb_request_t *sr)
59{
60	int rc;
61
62	rc = smbsr_decode_vwv(sr, "w", &sr->smb_fid);
63
64	DTRACE_SMB_START(op__Flush, smb_request_t *, sr);
65
66	return ((rc == 0) ? SDRC_SUCCESS : SDRC_ERROR);
67}
68
69void
70smb_post_flush(smb_request_t *sr)
71{
72	DTRACE_SMB_DONE(op__Flush, smb_request_t *, sr);
73}
74
75smb_sdrc_t
76smb_com_flush(smb_request_t *sr)
77{
78	smb_ofile_t	*file;
79	smb_llist_t	*flist;
80	int		rc;
81
82	if (smb_flush_required == 0) {
83		rc = smbsr_encode_empty_result(sr);
84		return ((rc == 0) ? SDRC_SUCCESS : SDRC_ERROR);
85	}
86
87	if (sr->smb_fid != 0xffff) {
88		smbsr_lookup_file(sr);
89		if (sr->fid_ofile == NULL) {
90			smbsr_error(sr, NT_STATUS_INVALID_HANDLE,
91			    ERRDOS, ERRbadfid);
92			return (SDRC_ERROR);
93		}
94		smb_ofile_flush(sr, sr->fid_ofile);
95	} else {
96		flist = &sr->tid_tree->t_ofile_list;
97		smb_llist_enter(flist, RW_READER);
98		file = smb_llist_head(flist);
99		while (file) {
100			mutex_enter(&file->f_mutex);
101			smb_ofile_flush(sr, file);
102			mutex_exit(&file->f_mutex);
103			file = smb_llist_next(flist, file);
104		}
105		smb_llist_exit(flist);
106	}
107
108	rc = smbsr_encode_empty_result(sr);
109	return ((rc == 0) ? SDRC_SUCCESS : SDRC_ERROR);
110}
111