Hi Tomas, Glad to hear from you again. Tomas M: > can I use aufs mount as a branch of another aufs mount?
Basically, you can't. Technically, such hierarchy will cause an internal recursive call which consumes the stack space a lot. Aufs explicitly prohibited it in the beginning. Later, another user had requested me to support it, and I did after some investigation and consideration. It was implemented with CONFIG_AUFS_ROBR "Aufs as an readonly branch of another aufs mount" in aufs1-age. But the feature was un-popular and I removed it when aufs has grown up. Current linux kernel consumes the less stack space than it used to. Additinonally the small stack space (4KB) configuration is gone now. So I guess it should be enough possible now. But it is suspicious for me to think it is really necessary. > Is there any workaround? > My goal is to create a chroot which will have current root as a > readonly branch, and tmpfs as writable branch. Why don't you try stacking onto a single aufs mount? - /(root) = /rwA + /roB - /union = /changes - /union(new) = /changes + /rwA + /roB instead of /union(new) = /changes + /root J. R. Okajima ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot
