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This reverts commit 5cd24b8d.

Signed-off-by: J. R. Okajima <hooanon05g@gmail.com>

Signed-off-by: J. R. Okajima <hooanon05g@gmail.com>

In Documentation/ABI/testing/{debug,sys}fs-aufs, I used a notation as
	brabraN, brabra1 ... brabraN
But it caused an error in "make htmldocs".

Reported-by: GI Jack
See-also: https://github.com/sfjro/aufs5-standalone/issues/4

Signed-off-by: J. R. Okajima <hooanon05g@gmail.com>

To make aufs internal functions can prepare 'userns' for VFS internal
functions.
Signed-off-by: J. R. Okajima <hooanon05g@gmail.com>

In mainline, by the commit
	549c7297717c3 2021-01-24 fs: make helpers idmap mount aware
and its series, a new parameter 'user_ns' was added to some inode
operations.  Aufs simply follows it, but it is still testing.
Signed-off-by: J. R. Okajima <hooanon05g@gmail.com>

This reverts commit 93ec4dd2.

Signed-off-by: J. R. Okajima <hooanon05g@gmail.com>