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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  * 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
     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
     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
     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