Miklos Szeredi wrote:
I still see a problem: what if old_nd.mnt is already detached, and
bind is non-recursive. Now it fails with EINVAL, though it used to
work (and I think is very useful).
Hey, you just made another argument for not detaching mounts when the
last task with that current->namespace exits, but instead detaching
mounts when the last reference to any vfsmnt in the namespace is dropped.
Hint :)
I have a better idea:
- create a "dead_mounts" namespace.
- chain each detached mount's ->mnt_list on dead_mounts->list
- set mnt_namespace to dead_mounts
- export the list via proc through the usual mount list interface
The last would be a nice bonus: I've always wanted to see the list of
detached, but not-yet destroyed mounts.
Does anybody see a problem with that?
FWIW, all this stuff has already been done and posted here.
Detachable chunks of vfsmounts:
http://marc.theaimsgroup.com/?l=linux-fsdevel&m=109872862003192&w=2
'Soft' reference counts for manipulating vfsmounts without pinning them
down:
http://marc.theaimsgroup.com/?l=linux-kernel&m=109872797030644&w=2
Referencing vfsmounts in userspace using a file descriptor:
http://marc.theaimsgroup.com/?l=linux-kernel&m=109871948812782&w=2
walking mountpoints in userspace:
http://marc.theaimsgroup.com/?l=linux-kernel&m=109875012510262&w=2
attaching mountpoints in userspace:
http://marc.theaimsgroup.com/?l=linux-fsdevel&m=109875063100111&w=2
detaching mountpoints in userspace:
http://marc.theaimsgroup.com/?l=linux-kernel&m=109880051800963&w=2
getting info from a vfsmount:
http://marc.theaimsgroup.com/?l=linux-kernel&m=109875135030473&w=2
Mike Waychison
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