diff options
author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 18:20:36 -0400 |
---|---|---|
committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 18:20:36 -0400 |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /fs/ntfs/time.h |
Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
Diffstat (limited to 'fs/ntfs/time.h')
-rw-r--r-- | fs/ntfs/time.h | 100 |
1 files changed, 100 insertions, 0 deletions
diff --git a/fs/ntfs/time.h b/fs/ntfs/time.h new file mode 100644 index 00000000000..a09a51dabe4 --- /dev/null +++ b/fs/ntfs/time.h | |||
@@ -0,0 +1,100 @@ | |||
1 | /* | ||
2 | * time.h - NTFS time conversion functions. Part of the Linux-NTFS project. | ||
3 | * | ||
4 | * Copyright (c) 2001-2004 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 | s64 t = 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 */ | ||