if something does cwd or chroot and so keeps any (and/or all) of the
mountpoints busy I deal with it thus - forcibly chroot/chdir it to a newly
allocated inode (and dentry) in the nullfs which makes the originals no
longer busy. Actually all of the code that dealt with cwd/chroot/open/mmap
was written and tested but after Al's changes "one superblock - many
mountpoints" I realized I have to rewrite most of it (mostly simply
changes like match mountpoints instead of matching superblocks - a few
cleanups left to do where I wasn't sure that mnt_count accounting was
broken because of my changes or because of VFS - will come back to it
soon, as promised after mid-July).
Regards,
Tigran.
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