Hi,
On 17.05.24 12:09, Frank Hsiao 蕭法宣 wrote:
related to: https://bugs.launchpad.net/ecryptfs/+bug/1890486
This bug happens in the two following situations:
cp -p: copy a file and preserve its atime and mtime
touch -r: touch a file and use a ref file's time instead of current time
was there some discussion for this solution. I came to the same conclusion but cannot test it right now.
Thanks
Bert
In fs/attr.c notify_change(), atime and mtime is truncated by timestamp_truncate(),
ecryptfs gets wrong s_time_gran (10^9 instead of original fs time granularity) and
truncates a/mtime to whole second. Setting s_time_gran when mounting ecryptfs
solves the issue.
Signed-off-by: Frank Hsiao 蕭法宣 <frankhsiao@xxxxxxxx>
diff --git a/fs/ecryptfs/main.c b/fs/ecryptfs/main.c
index b2f6a1937d239..19dbe9d1187e1 100644
--- a/fs/ecryptfs/main.c
+++ b/fs/ecryptfs/main.c
@@ -567,6 +567,7 @@ static struct dentry *ecryptfs_mount(struct file_system_type
*fs_type, int flags
s->s_blocksize = path.dentry->d_sb->s_blocksize;
s->s_magic = ECRYPTFS_SUPER_MAGIC;
s->s_stack_depth = path.dentry->d_sb->s_stack_depth + 1;
+ s->s_time_gran = path.dentry->d_sb->s_time_gran;
rc = -EINVAL;
if (s->s_stack_depth > FILESYSTEM_MAX_STACK_DEPTH) {
