Ian Kent:
> I may be missing something about this, but why is it safe to use
> iterate_mounts(), since it doesn't take the vfsmount_lock when
> traversing the list of mounts?
The sample code was not correct.
We need to acquire vfsmount_lock or down_read(namespace_sem).
Or it may be better to extract the body of iterate_mounts() and create a
new function __iterate_mounts() such like that.
__iterate_mounts()
{
/* equiv to the current iterate_mounts */
}
iterate_mount()
{
down_read(namespace_sem);
or spin_lock(&vfsmount_lock);
__iterate_mount();
spin_unlock(&vfsmount_lock);
or up_read(namespace_sem);
}
J. R. Okajima
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