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 * Copyright 2022 RackTop Systems, Inc.
28 */
29
30 /*
31 * The flush SMB is sent to ensure all data and allocation information
32 * for the corresponding file has been written to stable storage. This
33 * is a synchronous request. The response should not be sent until the
34 * writes are complete.
35 *
36 * The SmbFlush request is described in CIFS/1.0 1996 Section 3.9.14.
37 *
38 * CIFS/1.0 June 13, 1996
39 * Heizer, et al
40 * draft-heizer-cifs-v1-spec-00.txt
41 */
42
43 #include <smbsrv/smb_kproto.h>
44 #include <smbsrv/smb_fsops.h>
45
46
47 /*
48 * smb_com_flush
49 *
50 * Flush any cached data for a specified file, or for all files that
51 * this client has open, to stable storage. If the fid is valid (i.e.
52 * not 0xFFFF), we flush only that file. Otherwise we flush all files
53 * associated with this client.
54 *
55 * We need to protect the list because there's a good chance we'll
56 * block during the flush operation.
57 */
58 smb_sdrc_t
smb_pre_flush(smb_request_t * sr)59 smb_pre_flush(smb_request_t *sr)
60 {
61 int rc;
62
63 rc = smbsr_decode_vwv(sr, "w", &sr->smb_fid);
64
65 DTRACE_SMB_START(op__Flush, smb_request_t *, sr);
66
67 return ((rc == 0) ? SDRC_SUCCESS : SDRC_ERROR);
68 }
69
70 void
smb_post_flush(smb_request_t * sr)71 smb_post_flush(smb_request_t *sr)
72 {
73 DTRACE_SMB_DONE(op__Flush, smb_request_t *, sr);
74 }
75
76 smb_sdrc_t
smb_com_flush(smb_request_t * sr)77 smb_com_flush(smb_request_t *sr)
78 {
79 smb_ofile_t *file;
80 smb_lavl_t *lavl;
81 int rc;
82
83 if (smb_flush_required == 0) {
84 rc = smbsr_encode_empty_result(sr);
85 return ((rc == 0) ? SDRC_SUCCESS : SDRC_ERROR);
86 }
87
88 if (sr->smb_fid != 0xffff) {
89 smbsr_lookup_file(sr);
90 if (sr->fid_ofile == NULL) {
91 smbsr_error(sr, NT_STATUS_INVALID_HANDLE,
92 ERRDOS, ERRbadfid);
93 return (SDRC_ERROR);
94 }
95 smb_ofile_flush(sr, sr->fid_ofile);
96 } else {
97 lavl = &sr->tid_tree->t_ofile_list;
98 smb_lavl_enter(lavl, RW_READER);
99 file = smb_lavl_first(lavl);
100 while (file) {
101 mutex_enter(&file->f_mutex);
102 smb_ofile_flush(sr, file);
103 mutex_exit(&file->f_mutex);
104 file = smb_lavl_next(lavl, file);
105 }
106 smb_lavl_exit(lavl);
107 }
108
109 rc = smbsr_encode_empty_result(sr);
110 return ((rc == 0) ? SDRC_SUCCESS : SDRC_ERROR);
111 }
112