ramfs and directory modification time

[Ph. Marek]

Hello everybody,

I believe that I found a problem regarding ramfs and directory modification 
times.



Observe:
	$ /tmp# mkdir newdir
	$ /tmp# mount -t ramfs none newdir
	$ /tmp# cd newdir/
	$ /tmp/newdir# mkdir sub
	$ /tmp/newdir# cd sub
	$ /tmp/newdir/sub# ls -la --full-time
	total 0
	drwxr-xr-x 2 root root 0 2006-02-23 14:01:37.573655160 +0100 .
	drwxr-xr-x 3 root root 0 2006-02-23 14:01:33.221316816 +0100 ..
	$ /tmp/newdir/sub# touch a-new-file
	$ /tmp/newdir/sub# ls -la --full-time
	total 0
	drwxr-xr-x 2 root root 0 2006-02-23 14:01:37.573655160 +0100 .
	drwxr-xr-x 3 root root 0 2006-02-23 14:01:33.221316816 +0100 ..
	-rw-r--r-- 1 root root 0 2006-02-23 14:01:48.019067216 +0100 a-new-file

On a tmpfs or other (disk-based) filesystems (ext3) it works correctly.
Is that a design wish, that ramfs is kept as simple as possible?

Nevertheless I believe that should be fixed, as everything that relies on the 
directory mtime won't work on an ramfs.


This is 2.6.26-rc4, btw, on x86.


Please CC me as I'm not subscribed (although I surely will have a look in the 
archives, too).


Regards,

Phil
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