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
26/*
27 * The flush SMB is sent to ensure all data and allocation information
28 * for the corresponding file has been written to stable storage. This
29 * is a synchronous request. The response should not be sent until the
30 * writes are complete.
31 *
32 * The SmbFlush request is described in CIFS/1.0 1996 Section 3.9.14.
33 *
34 * CIFS/1.0 June 13, 1996
35 * Heizer, et al
36 * draft-heizer-cifs-v1-spec-00.txt
37 */
38
39#include <smbsrv/smb_kproto.h>
40#include <smbsrv/smb_fsops.h>
41
42
43static void smb_flush_file(struct smb_request *sr, struct smb_ofile *ofile);
44
45/*
46 * smb_com_flush
47 *
48 * Flush any cached data for a specified file, or for all files that
49 * this client has open, to stable storage. If the fid is valid (i.e.
50 * not 0xFFFF), we flush only that file. Otherwise we flush all files
51 * associated with this client.
52 *
53 * We need to protect the list because there's a good chance we'll
54 * block during the flush operation.
55 */
56smb_sdrc_t
57smb_pre_flush(smb_request_t *sr)
58{
59	int rc;
60
61	rc = smbsr_decode_vwv(sr, "w", &sr->smb_fid);
62
63	DTRACE_SMB_1(op__Flush__start, smb_request_t *, sr);
64
65	return ((rc == 0) ? SDRC_SUCCESS : SDRC_ERROR);
66}
67
68void
69smb_post_flush(smb_request_t *sr)
70{
71	DTRACE_SMB_1(op__Flush__done, smb_request_t *, sr);
72}
73
74smb_sdrc_t
75smb_com_flush(smb_request_t *sr)
76{
77	smb_ofile_t	*file;
78	smb_llist_t	*flist;
79	int		rc;
80
81	if (smb_flush_required == 0) {
82		rc = smbsr_encode_empty_result(sr);
83		return ((rc == 0) ? SDRC_SUCCESS : SDRC_ERROR);
84	}
85
86	if (sr->smb_fid != 0xffff) {
87		smbsr_lookup_file(sr);
88		if (sr->fid_ofile == NULL) {
89			smbsr_error(sr, NT_STATUS_INVALID_HANDLE,
90			    ERRDOS, ERRbadfid);
91			return (SDRC_ERROR);
92		}
93
94		smb_flush_file(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_flush_file(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
112
113/*
114 * smb_flush_file
115 *
116 * If writes on this file are not synchronous, flush it using the NFSv3
117 * commit interface.
118 */
119static void
120smb_flush_file(struct smb_request *sr, struct smb_ofile *ofile)
121{
122	sr->user_cr = smb_ofile_getcred(ofile);
123
124	if ((ofile->f_node->flags & NODE_FLAGS_WRITE_THROUGH) == 0)
125		(void) smb_fsop_commit(sr, sr->user_cr, ofile->f_node);
126}
127