Messages in this thread | | | From | Rob Landley <> | Subject | Re: pivot_root broken in 2.6.15-rc1-mm2 | Date | Wed, 23 Nov 2005 06:02:52 -0600 |
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On Tuesday 22 November 2005 21:01, Neil Brown wrote: > Ah, OK. > It's just that pivot_root works in this context in 2.6.11.9, so I > figured it was a breakage.
And if you then umount the ramfs you just pivoted, the kernel locks hard.
That was a bug.
What you're looking for is switch_root, which has variants buried in klib, or in the current CVS version of busybox, or glued into Red Hat's weird little multi-function ramdisk shell, and probably a few other places by now.
Rather than unmounting rootfs, it deletes everything out of it to free up the space. (It basically does the functional equivalent of "find / -xdev | xargs rm -rf", overmounts the old root with the new root, does a chroot, and execs the new init out of the new root. Actually getting it right's a bit tricky, of course. I still need to test the busybox version a whole lot more. It's on my to-do list...)
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