Re: [PATCH] fix race in mark_mounts_for_expiry()

[Miklos Szeredi]

> That makes less sense if we allow other tasks to be using a namespace
> through a passing a file descriptor, and then the last task which has
> current->namespace equal to that namespace exits.  It makes no sense
> to me that the mount which is still accessible through the file
> descriptor is suddenly detached from it's parent and children mounts.

I see your point.  I don't yet see a solution.

Currently detach is an explicit action, not something automatic which
happens when there are no more references to a vfsmount.

> Why is it not good enough to detach each vfsmnt when the last
> reference to each vfsmnt is dropped?  In other words, simply when the
> vfsmnt becomes unreachable?

Define unreachable.  Then define a mechanism, by which it can be
detected.

Miklos
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