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 }