Re: devfs vs udev, thoughts from a devfs user

[Kevin P. Fleming]

Greg KH wrote:

> Doesn't work for what we want here:
>
> 	$ mkdir /tmp/a /tmp/b
> 	$ mount -t ramfs none /tmp/a
> 	$ touch /tmp/a/foo
> 	$ mount --move /tmp/a /tmp/b
> 	$ ls /tmp/b
> 	foo
> 	$ umount /tmp/a
> 	$ ls /tmp/b
> 	$ 

That seems very odd, the "umount /tmp/a" should have failed, given than 
nothing is mounted there any longer.

Also, what will happen if something on the filesystem on /tmp/a is open 
(say, /dev/console)? I was thinking that this process might work better:

$ mkdir /tmp/a /tmp/b
$ mount -t ramfs test /tmp/a
$ touch /tmp/a/foo
$ mount --bind /tmp/a /tmp/b
$ ls /tmp/b
foo
$ umount /tmp/a
$ ls /tmp/b
foo


And it does. In fact, it seems to work fine as long as no files are open 
on the ramfs when the umount is executed (otherwise -EBUSY).


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