6.12-stable review patch. If anyone has any objections, please let me know.
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From: Konstantin Komarov almaz.alexandrovich@paragon-software.com
[ Upstream commit 5180138604323895b5c291eca6aa7c20be494ade ]
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 Signed-off-by: Sasha Levin sashal@kernel.org --- fs/ntfs3/ntfs_fs.h | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-)
diff --git a/fs/ntfs3/ntfs_fs.h b/fs/ntfs3/ntfs_fs.h index ff7f241a25b24..a1040060b081f 100644 --- a/fs/ntfs3/ntfs_fs.h +++ b/fs/ntfs3/ntfs_fs.h @@ -980,11 +980,12 @@ static inline __le64 kernel2nt(const 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_nsec = do_div(t, _100ns2seconds) * 100; - ts->tv_sec = t; + ts->tv_sec = div_s64_rem(t, _100ns2seconds, &t32); + ts->tv_nsec = t32 * 100; }
static inline struct ntfs_sb_info *ntfs_sb(struct super_block *sb)