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
43 static 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 */
56 smb_sdrc_t
smb_pre_flush(smb_request_t * sr)57 smb_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
68 void
smb_post_flush(smb_request_t * sr)69 smb_post_flush(smb_request_t *sr)
70 {
71 DTRACE_SMB_1(op__Flush__done, smb_request_t *, sr);
72 }
73
74 smb_sdrc_t
smb_com_flush(smb_request_t * sr)75 smb_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 */
119 static void
smb_flush_file(struct smb_request * sr,struct smb_ofile * ofile)120 smb_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