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

Simply follows the mainline,
294f69e662d15 2019-10-11 compiler_attributes.h: Add 'fallthrough' pseudo keyword for switch/case use
Signed-off-by: J. R. Okajima <hooanon05g@gmail.com>

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

# Conflicts:
#	fs/aufs/branch.c

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

# Conflicts:
#	fs/aufs/branch.c

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

By the recent commit
	21913077f9918 2020-06-17 aufs: do not call i_readcount_inc()
a very old bug was fixed, which is inblance counter.
But still aufs needs to call i_readcount_inc() when the branch
permission is chaned from RW to RO.  Otherwise the counter reaches 0
and BUG() in i_readcount_dec() will be activated.
Signed-off-by: J. R. Okajima <hooanon05g@gmail.com>
(cherry picked from commit f10aea57d39d6cd311312e9e7746804f7059b5c8)