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 2017 Nexenta Systems, Inc.  All rights reserved.
26  */
27 /*
28  * SMB: lock_byte_range
29  *
30  * The lock record message is sent to lock the given byte range.  More than
31  * one non-overlapping byte range may be locked in a given file.  Locks
32  * prevent attempts to lock, read or write the locked portion of the file
33  * by other clients or Pids.  Overlapping locks are not allowed. Offsets
34  * beyond the current end of file may be locked.  Such locks will not cause
35  * allocation of file space.
36  *
37  * Since Offset is a 32 bit quantity, this request is inappropriate for
38  * general locking within a very large file.
39  *
40  * Client Request                     Description
41  * ================================== =================================
42  *
43  * UCHAR WordCount;                   Count of parameter words = 5
44  * USHORT Fid;                        File handle
45  * ULONG Count;                       Count of bytes to lock
46  * ULONG Offset;                      Offset from start of file
47  * USHORT ByteCount;                  Count of data bytes = 0
48  *
49  * Locks may only be unlocked by the Pid that performed the lock.
50  *
51  * Server Response                    Description
52  * ================================== =================================
53  *
54  * UCHAR WordCount;                   Count of parameter words = 0
55  * USHORT ByteCount;                  Count of data bytes = 0
56  *
57  * This client request does not wait for the lock to be granted.  If the
58  * lock can not be immediately granted (within 200-300 ms), the server
59  * should return failure to the client
60  */
61 
62 #include <smbsrv/smb_kproto.h>
63 
64 smb_sdrc_t
smb_pre_lock_byte_range(smb_request_t * sr)65 smb_pre_lock_byte_range(smb_request_t *sr)
66 {
67 	DTRACE_SMB_START(op__LockByteRange, smb_request_t *, sr);
68 	return (SDRC_SUCCESS);
69 }
70 
71 void
smb_post_lock_byte_range(smb_request_t * sr)72 smb_post_lock_byte_range(smb_request_t *sr)
73 {
74 	DTRACE_SMB_DONE(op__LockByteRange, smb_request_t *, sr);
75 }
76 
77 /*
78  * Legacy SMB command; takes an exclusive byte-range lock
79  */
80 smb_sdrc_t
smb_com_lock_byte_range(struct smb_request * sr)81 smb_com_lock_byte_range(struct smb_request *sr)
82 {
83 	uint32_t	count;
84 	uint32_t	off;
85 	uint32_t	lk_pid;
86 	DWORD		result;
87 	int		rc;
88 
89 	if (smbsr_decode_vwv(sr, "wll", &sr->smb_fid, &count, &off) != 0)
90 		return (SDRC_ERROR);
91 
92 	smbsr_lookup_file(sr);
93 	if (sr->fid_ofile == NULL) {
94 		smbsr_error(sr, NT_STATUS_INVALID_HANDLE,
95 		    ERRDOS, ERRbadfid);
96 		return (SDRC_ERROR);
97 	}
98 
99 	/* Note: SMB1 locking uses 16-bit PIDs. */
100 	lk_pid = sr->smb_pid & 0xFFFF;
101 
102 	result = smb_lock_range(sr, (u_offset_t)off, (uint64_t)count,
103 	    lk_pid, SMB_LOCK_TYPE_READWRITE, 0);
104 	if (result != NT_STATUS_SUCCESS) {
105 		smb_lock_range_error(sr, result);
106 		return (SDRC_ERROR);
107 	}
108 
109 	rc = smbsr_encode_empty_result(sr);
110 	return ((rc == 0) ? SDRC_SUCCESS : SDRC_ERROR);
111 }
112