[PATCH] root-hopping for pre-2.3.41-3

[almesber en lrc.di.epfl.ch]

Horst von Brand wrote:
> Might be useful in other cases too (it would in fact provide atomic umount
> + mount another fs) if used elsewhere.

Matthew Wilcox has a patch for 2.2.14 that does this. In fact, a
"move-mount" is even a bit simpler than pivot_root, because you
have two directories instead of three.

Note that you don't really need to do any cleanup, because you never
do a real unmount. All you need to do is to grab the kernel lock in
order to prevent other processes from crossing the mount points while
you're changing them.

- Werner

-- 
  _________________________________________________________________________
 / Werner Almesberger, ICA, EPFL, CH       werner.almesberger en ica.epfl.ch /
/_IN_N_032__Tel_+41_21_693_6621__Fax_+41_21_693_6610_____________________/

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