Messages in this thread | | | From | Andy Lutomirski <> | Date | Mon, 29 Sep 2014 16:45:42 -0700 | Subject | Removing shared subtrees? |
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As far as I know, shared subtrees in recursive bind mounts are a misfeature that existed for the sole purpose of allowing recursive binds + chroot to emulate mount namespaces. But we have mount namespaces, so what are they for?
They're totally fsked up. For example, don't try this on a live system:
# mount --make-rshared / # mount --rbind / /mnt # umount -l /mnt
It will unmount *everything*. On Fedora, you don't even need the --make-rshared part. WTF?
Can we just remove the feature entirely in linux-next and see if anyone complains? I'm all for propagation across mount namespaces, but I suspect that, at the very least, there is no legitimate reason whatsoever for mounts to propagate from a recursive bind mount back to the origin.
IOW, can we kill shared mounts and just keep private and slave mounts?
--Andy
-- Andy Lutomirski AMA Capital Management, LLC
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