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Frank Hsiao 蕭法宣 7d9ebf33d8 ecryptfs: Set s_time_gran to get correct time granularity ...

Set the eCryptfs superblock time granularity, using the lower
filesystem's s_time_gran value, to prevent unnecessary inode timestamp
truncation to the granularity of a full second.

The use of utimensat(2) to set a timestamp with nanosecond precision
would trigger this bug. That occurred when using the following utilities
to update timestamps of a file:
  * cp -p: copy a file and preserve its atime and mtime
  * touch -r: touch a file and use a reference file's timestamps

Closes: https://bugs.launchpad.net/ecryptfs/+bug/1890486
Signed-off-by: Frank Hsiao 蕭法宣 <frankhsiao@qnap.com>
[tyhicks: Partially rewrite the commit message]
Signed-off-by: Tyler Hicks <code@tyhicks.com>

2026-03-25 22:35:49 -05:00

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