BTW, speaking of mntput_long(): I really hate that API. It's
asking for subtle leaks - use mntget_long() in pair with mntput() and
you are fucked. Worse, these suckers are created with long reference
now, so any code that used to use mntput() to kill a cloned/freshly
created vfsmount got silently b0rken. A quick look already caught
one such case - fs/nfsctl.c do_open() uses mntput() in pair with
do_kern_mount(), which leads to longrefs left at 1.
Rationale for that mess, please...
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