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 * SMB: lock_byte_range
27 *
28 * The lock record message is sent to lock the given byte range.  More than
29 * one non-overlapping byte range may be locked in a given file.  Locks
30 * prevent attempts to lock, read or write the locked portion of the file
31 * by other clients or Pids.  Overlapping locks are not allowed. Offsets
32 * beyond the current end of file may be locked.  Such locks will not cause
33 * allocation of file space.
34 *
35 * Since Offset is a 32 bit quantity, this request is inappropriate for
36 * general locking within a very large file.
37 *
38 * Client Request                     Description
39 * ================================== =================================
40 *
41 * UCHAR WordCount;                   Count of parameter words = 5
42 * USHORT Fid;                        File handle
43 * ULONG Count;                       Count of bytes to lock
44 * ULONG Offset;                      Offset from start of file
45 * USHORT ByteCount;                  Count of data bytes = 0
46 *
47 * Locks may only be unlocked by the Pid that performed the lock.
48 *
49 * Server Response                    Description
50 * ================================== =================================
51 *
52 * UCHAR WordCount;                   Count of parameter words = 0
53 * USHORT ByteCount;                  Count of data bytes = 0
54 *
55 * This client request does not wait for the lock to be granted.  If the
56 * lock can not be immediately granted (within 200-300 ms), the server
57 * should return failure to the client
58 */
59
60#include <smbsrv/smb_kproto.h>
61
62smb_sdrc_t
63smb_pre_lock_byte_range(smb_request_t *sr)
64{
65	DTRACE_SMB_1(op__LockByteRange__start, smb_request_t *, sr);
66	return (SDRC_SUCCESS);
67}
68
69void
70smb_post_lock_byte_range(smb_request_t *sr)
71{
72	DTRACE_SMB_1(op__LockByteRange__done, smb_request_t *, sr);
73}
74
75smb_sdrc_t
76smb_com_lock_byte_range(struct smb_request *sr)
77{
78	uint32_t	count;
79	uint32_t	off;
80	DWORD		result;
81	int		rc;
82
83	if (smbsr_decode_vwv(sr, "wll", &sr->smb_fid, &count, &off) != 0)
84		return (SDRC_ERROR);
85
86	smbsr_lookup_file(sr);
87	if (sr->fid_ofile == NULL) {
88		smbsr_error(sr, NT_STATUS_INVALID_HANDLE,
89		    ERRDOS, ERRbadfid);
90		return (SDRC_ERROR);
91	}
92
93	/*
94	 * The last parameter is lock type. This is dependent on
95	 * lock flag (3rd parameter). Since the lock flag is
96	 * set to be exclusive, lock type is passed as
97	 * normal lock (write lock).
98	 */
99	result = smb_lock_range(sr, (u_offset_t)off, (uint64_t)count,  0,
100	    SMB_LOCK_TYPE_READWRITE);
101	if (result != NT_STATUS_SUCCESS) {
102		smb_lock_range_error(sr, result);
103		return (SDRC_ERROR);
104	}
105
106	rc = smbsr_encode_empty_result(sr);
107	return ((rc == 0) ? SDRC_SUCCESS : SDRC_ERROR);
108}
109