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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2009 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*
* Copyright 2017 Nexenta Systems, Inc. All rights reserved.
*/
/*
* SMB: lock_byte_range
*
* The lock record message is sent to lock the given byte range. More than
* one non-overlapping byte range may be locked in a given file. Locks
* prevent attempts to lock, read or write the locked portion of the file
* by other clients or Pids. Overlapping locks are not allowed. Offsets
* beyond the current end of file may be locked. Such locks will not cause
* allocation of file space.
*
* Since Offset is a 32 bit quantity, this request is inappropriate for
* general locking within a very large file.
*
* Client Request Description
* ================================== =================================
*
* UCHAR WordCount; Count of parameter words = 5
* USHORT Fid; File handle
* ULONG Count; Count of bytes to lock
* ULONG Offset; Offset from start of file
* USHORT ByteCount; Count of data bytes = 0
*
* Locks may only be unlocked by the Pid that performed the lock.
*
* Server Response Description
* ================================== =================================
*
* UCHAR WordCount; Count of parameter words = 0
* USHORT ByteCount; Count of data bytes = 0
*
* This client request does not wait for the lock to be granted. If the
* lock can not be immediately granted (within 200-300 ms), the server
* should return failure to the client
*/
#include <smbsrv/smb_kproto.h>
smb_sdrc_t
smb_pre_lock_byte_range(smb_request_t *sr)
{
DTRACE_SMB_START(op__LockByteRange, smb_request_t *, sr);
return (SDRC_SUCCESS);
}
void
smb_post_lock_byte_range(smb_request_t *sr)
{
DTRACE_SMB_DONE(op__LockByteRange, smb_request_t *, sr);
}
/*
* Legacy SMB command; takes an exclusive byte-range lock
*/
smb_sdrc_t
smb_com_lock_byte_range(struct smb_request *sr)
{
uint32_t count;
uint32_t off;
uint32_t lk_pid;
DWORD result;
int rc;
if (smbsr_decode_vwv(sr, "wll", &sr->smb_fid, &count, &off) != 0)
return (SDRC_ERROR);
smbsr_lookup_file(sr);
if (sr->fid_ofile == NULL) {
smbsr_error(sr, NT_STATUS_INVALID_HANDLE,
ERRDOS, ERRbadfid);
return (SDRC_ERROR);
}
/* Note: SMB1 locking uses 16-bit PIDs. */
lk_pid = sr->smb_pid & 0xFFFF;
result = smb_lock_range(sr, (u_offset_t)off, (uint64_t)count,
lk_pid, SMB_LOCK_TYPE_READWRITE, 0);
if (result != NT_STATUS_SUCCESS) {
smb_lock_range_error(sr, result);
return (SDRC_ERROR);
}
rc = smbsr_encode_empty_result(sr);
return ((rc == 0) ? SDRC_SUCCESS : SDRC_ERROR);
}
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