Gh0st
/
linux
mirror of https://github.com/torvalds/linux.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

fs/ntfs3: Support timestamps prior to epoch 

Before it used an unsigned 64-bit type, which prevented proper handling
of timestamps earlier than 1970-01-01. Switch to a signed 64-bit type to
support pre-epoch timestamps. The issue was caught by xfstests.

Signed-off-by: Konstantin Komarov <almaz.alexandrovich@paragon-software.com>
This commit is contained in:
Konstantin Komarov 2025-09-01 11:48:48 +03:00
parent 3a86608788
commit 5180138604
No known key found for this signature in database
GPG Key ID: A9B0331F832407B6
1 changed files with 5 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
fs/ntfs3/ntfs_fs.h
View File

@ -979,11 +979,12 @@ static inline __le64 kernel2nt(const struct timespec64 *ts)
*/ */
static inline void nt2kernel(const __le64 tm, struct timespec64 *ts) static inline void nt2kernel(const __le64 tm, struct timespec64 *ts)
{ {
u64 t = le64_to_cpu(tm) - _100ns2seconds * SecondsToStartOf1970; s32 t32;
/* use signed 64 bit to support timestamps prior to epoch. xfstest 258. */
s64 t = le64_to_cpu(tm) - _100ns2seconds * SecondsToStartOf1970;
// WARNING: do_div changes its first argument(!) ts->tv_sec = div_s64_rem(t, _100ns2seconds, &t32);
ts->tv_nsec = do_div(t, _100ns2seconds) * 100; ts->tv_nsec = t32 * 100;
ts->tv_sec = t;
} }
static inline struct ntfs_sb_info *ntfs_sb(struct super_block *sb) static inline struct ntfs_sb_info *ntfs_sb(struct super_block *sb)