The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/fs/ntfs/time.h

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    1 /*
    2  * time.h - NTFS time conversion functions.  Part of the Linux-NTFS project.
    3  *
    4  * Copyright (c) 2001-2005 Anton Altaparmakov
    5  *
    6  * This program/include file is free software; you can redistribute it and/or
    7  * modify it under the terms of the GNU General Public License as published
    8  * by the Free Software Foundation; either version 2 of the License, or
    9  * (at your option) any later version.
   10  *
   11  * This program/include file is distributed in the hope that it will be
   12  * useful, but WITHOUT ANY WARRANTY; without even the implied warranty
   13  * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   14  * GNU General Public License for more details.
   15  *
   16  * You should have received a copy of the GNU General Public License
   17  * along with this program (in the main directory of the Linux-NTFS
   18  * distribution in the file COPYING); if not, write to the Free Software
   19  * Foundation,Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
   20  */
   21 
   22 #ifndef _LINUX_NTFS_TIME_H
   23 #define _LINUX_NTFS_TIME_H
   24 
   25 #include <linux/time.h>         /* For current_kernel_time(). */
   26 #include <asm/div64.h>          /* For do_div(). */
   27 
   28 #include "endian.h"
   29 
   30 #define NTFS_TIME_OFFSET ((s64)(369 * 365 + 89) * 24 * 3600 * 10000000)
   31 
   32 /**
   33  * utc2ntfs - convert Linux UTC time to NTFS time
   34  * @ts:         Linux UTC time to convert to NTFS time
   35  *
   36  * Convert the Linux UTC time @ts to its corresponding NTFS time and return
   37  * that in little endian format.
   38  *
   39  * Linux stores time in a struct timespec consisting of a time_t (long at
   40  * present) tv_sec and a long tv_nsec where tv_sec is the number of 1-second
   41  * intervals since 1st January 1970, 00:00:00 UTC and tv_nsec is the number of
   42  * 1-nano-second intervals since the value of tv_sec.
   43  *
   44  * NTFS uses Microsoft's standard time format which is stored in a s64 and is
   45  * measured as the number of 100-nano-second intervals since 1st January 1601,
   46  * 00:00:00 UTC.
   47  */
   48 static inline sle64 utc2ntfs(const struct timespec ts)
   49 {
   50         /*
   51          * Convert the seconds to 100ns intervals, add the nano-seconds
   52          * converted to 100ns intervals, and then add the NTFS time offset.
   53          */
   54         return cpu_to_sle64((s64)ts.tv_sec * 10000000 + ts.tv_nsec / 100 +
   55                         NTFS_TIME_OFFSET);
   56 }
   57 
   58 /**
   59  * get_current_ntfs_time - get the current time in little endian NTFS format
   60  *
   61  * Get the current time from the Linux kernel, convert it to its corresponding
   62  * NTFS time and return that in little endian format.
   63  */
   64 static inline sle64 get_current_ntfs_time(void)
   65 {
   66         return utc2ntfs(current_kernel_time());
   67 }
   68 
   69 /**
   70  * ntfs2utc - convert NTFS time to Linux time
   71  * @time:       NTFS time (little endian) to convert to Linux UTC
   72  *
   73  * Convert the little endian NTFS time @time to its corresponding Linux UTC
   74  * time and return that in cpu format.
   75  *
   76  * Linux stores time in a struct timespec consisting of a time_t (long at
   77  * present) tv_sec and a long tv_nsec where tv_sec is the number of 1-second
   78  * intervals since 1st January 1970, 00:00:00 UTC and tv_nsec is the number of
   79  * 1-nano-second intervals since the value of tv_sec.
   80  *
   81  * NTFS uses Microsoft's standard time format which is stored in a s64 and is
   82  * measured as the number of 100 nano-second intervals since 1st January 1601,
   83  * 00:00:00 UTC.
   84  */
   85 static inline struct timespec ntfs2utc(const sle64 time)
   86 {
   87         struct timespec ts;
   88 
   89         /* Subtract the NTFS time offset. */
   90         u64 t = (u64)(sle64_to_cpu(time) - NTFS_TIME_OFFSET);
   91         /*
   92          * Convert the time to 1-second intervals and the remainder to
   93          * 1-nano-second intervals.
   94          */
   95         ts.tv_nsec = do_div(t, 10000000) * 100;
   96         ts.tv_sec = t;
   97         return ts;
   98 }
   99 
  100 #endif /* _LINUX_NTFS_TIME_H */

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