Florian Weimer <[email protected]> added the comment:
I believe you might be observing an XFS limitation in combination with a Linux
VFS bug.
On disk, XFS only supports 32-bit timestamps:
typedef struct xfs_timestamp {
__be32 t_sec; /* timestamp seconds */
__be32 t_nsec; /* timestamp nanoseconds */
} xfs_timestamp_t;
This is on the roadmap being fixed.
However, the Linux VFS code does not appear to know about this. It caches the
full 64-bit value. You only see the truncated value if it is read back from
disk:
# touch -t 222201020304 /tmp/t
# ls -l /tmp/t
-rw-r--r--. 1 root root 0 Jan 2 2222 /tmp/t
# echo 3 > /proc/sys/vm/drop_caches
# ls -l /tmp/t
-rw-r--r--. 1 root root 0 Oct 19 1949 /tmp/t
This is a bug in the Linux VFS layer.
----------
nosy: +fweimer
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