Re: [PATCH] fix race in mark_mounts_for_expiry()

[David Howells]

Miklos Szeredi <miklos@xxxxxxxxxx> wrote:

> 
> How about this patch?  It tries to solve this race without additional
> locking.  If refcount is already zero, it will increment and decrement
> it.  So be careful to only call grab_namespace() with vfsmount_lock
> held, otherwise it could race with itself.  (vfsmount_lock is also
> needed in this case so that mnt->mnt_namespace, doesn't change, while
> grabbing the namespace)

How about using cmpxchg?

David
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