60 строки
1.4 KiB
C
60 строки
1.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (c) International Business Machines Corp., 2002,2008
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* Author(s): Steve French (sfrench@us.ibm.com)
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*
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* Error mapping routines from Samba libsmb/errormap.c
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* Copyright (C) Andrew Tridgell 2001
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*/
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#include "glob.h"
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#include "smberr.h"
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#include "nterr.h"
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#include "smb_common.h"
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/*
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* Convert the NT UTC (based 1601-01-01, in hundred nanosecond units)
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* into Unix UTC (based 1970-01-01, in seconds).
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*/
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struct timespec64 ksmbd_NTtimeToUnix(__le64 ntutc)
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{
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struct timespec64 ts;
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/* Subtract the NTFS time offset, then convert to 1s intervals. */
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s64 t = le64_to_cpu(ntutc) - NTFS_TIME_OFFSET;
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u64 abs_t;
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/*
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* Unfortunately can not use normal 64 bit division on 32 bit arch, but
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* the alternative, do_div, does not work with negative numbers so have
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* to special case them
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*/
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if (t < 0) {
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abs_t = -t;
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ts.tv_nsec = do_div(abs_t, 10000000) * 100;
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ts.tv_nsec = -ts.tv_nsec;
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ts.tv_sec = -abs_t;
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} else {
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abs_t = t;
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ts.tv_nsec = do_div(abs_t, 10000000) * 100;
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ts.tv_sec = abs_t;
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}
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return ts;
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}
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/* Convert the Unix UTC into NT UTC. */
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inline u64 ksmbd_UnixTimeToNT(struct timespec64 t)
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{
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/* Convert to 100ns intervals and then add the NTFS time offset. */
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return (u64)t.tv_sec * 10000000 + t.tv_nsec / 100 + NTFS_TIME_OFFSET;
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}
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inline long long ksmbd_systime(void)
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{
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struct timespec64 ts;
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ktime_get_real_ts64(&ts);
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return ksmbd_UnixTimeToNT(ts);
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}
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