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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* fs/ksmbd/netmisc.c
*
* Copyright (c) International Business Machines Corp., 2002,2008
* Author(s): Steve French (sfrench@us.ibm.com)
*
* Error mapping routines from Samba libsmb/errormap.c
* Copyright (C) Andrew Tridgell 2001
*/
#include "glob.h"
#include "smberr.h"
#include "nterr.h"
#include "time_wrappers.h"
/*
* Convert the NT UTC (based 1601-01-01, in hundred nanosecond units)
* into Unix UTC (based 1970-01-01, in seconds).
*/
struct timespec64 ksmbd_NTtimeToUnix(__le64 ntutc)
{
struct timespec64 ts;
/* Subtract the NTFS time offset, then convert to 1s intervals. */
s64 t = le64_to_cpu(ntutc) - NTFS_TIME_OFFSET;
u64 abs_t;
/*
* Unfortunately can not use normal 64 bit division on 32 bit arch, but
* the alternative, do_div, does not work with negative numbers so have
* to special case them
*/
if (t < 0) {
abs_t = -t;
ts.tv_nsec = do_div(abs_t, 10000000) * 100;
ts.tv_nsec = -ts.tv_nsec;
ts.tv_sec = -abs_t;
} else {
abs_t = t;
ts.tv_nsec = do_div(abs_t, 10000000) * 100;
ts.tv_sec = abs_t;
}
return ts;
}
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