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
62 smb_sdrc_t
smb_pre_lock_byte_range(smb_request_t * sr)63 smb_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
69 void
smb_post_lock_byte_range(smb_request_t * sr)70 smb_post_lock_byte_range(smb_request_t *sr)
71 {
72 DTRACE_SMB_1(op__LockByteRange__done, smb_request_t *, sr);
73 }
74
75 smb_sdrc_t
smb_com_lock_byte_range(struct smb_request * sr)76 smb_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