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      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  * SMB: unlock_byte_range
     28  *
     29  * This message is sent to unlock the given byte range.  Offset, Count, and
     30  * Pid must be identical to that specified in a prior successful lock.  If
     31  *
     32  * an unlock references an address range that is not locked, no error is
     33  * generated.
     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 unlock
     44  * ULONG Offset;                      Offset from start of file
     45  * USHORT ByteCount;                  Count of data bytes = 0
     46  *
     47  * Server Response                    Description
     48  * ================================== =================================
     49  *
     50  * UCHAR WordCount;                   Count of parameter words = 0
     51  * USHORT ByteCount;                  Count of data bytes = 0
     52  */
     53 
     54 #include <smbsrv/smb_kproto.h>
     55 
     56 smb_sdrc_t
     57 smb_pre_unlock_byte_range(smb_request_t *sr)
     58 {
     59 	DTRACE_SMB_1(op__UnlockByteRange__start, smb_request_t *, sr);
     60 	return (SDRC_SUCCESS);
     61 }
     62 
     63 void
     64 smb_post_unlock_byte_range(smb_request_t *sr)
     65 {
     66 	DTRACE_SMB_1(op__UnlockByteRange__done, smb_request_t *, sr);
     67 }
     68 
     69 smb_sdrc_t
     70 smb_com_unlock_byte_range(smb_request_t *sr)
     71 {
     72 	uint32_t	Length;
     73 	uint32_t	Offset;
     74 	DWORD		result;
     75 
     76 	if (smbsr_decode_vwv(sr, "wll", &sr->smb_fid, &Length, &Offset) != 0)
     77 		return (SDRC_ERROR);
     78 
     79 	smbsr_lookup_file(sr);
     80 	if (sr->fid_ofile == NULL) {
     81 		smbsr_error(sr, NT_STATUS_INVALID_HANDLE, ERRDOS, ERRbadfid);
     82 		return (SDRC_ERROR);
     83 	}
     84 
     85 	result = smb_unlock_range(sr, sr->fid_ofile->f_node,
     86 	    (u_offset_t)Offset, (uint64_t)Length);
     87 	if (result != NT_STATUS_SUCCESS) {
     88 		smbsr_error(sr, NT_STATUS_RANGE_NOT_LOCKED,
     89 		    ERRDOS, ERRnotlocked);
     90 		return (SDRC_ERROR);
     91 	}
     92 
     93 	if (smbsr_encode_empty_result(sr))
     94 		return (SDRC_ERROR);
     95 
     96 	return (SDRC_SUCCESS);
     97 }
     98