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In linux v5.7-rc2, zero-length array declarations are replaced by FAM
(flexible-array member),
	a2008395fe2e 2020-04-18 dirent.h: Replace zero-length array with flexible-array member

Aufs simply follows this trend.
Signed-off-by: J. R. Okajima <hooanon05g@gmail.com>
(cherry picked from commit 747a01ec1835988fa20177789a6fb65c5198fcb9)

In aufs5.4, kmemleak reported several false positives in
fs/aufs/xino.c.  I don't know why, but it may be related to the
"delayed" kfree (by RCU).  So I simply replace it by direct kfree()
call.
Signed-off-by: J. R. Okajima <hooanon05g@gmail.com>
(cherry picked from commit 03836b8128073f92b4e4a1cb54f91d0d7c290d1f)

Signed-off-by: J. R. Okajima <hooanon05g@gmail.com>
(cherry picked from commit 56b4b776c84f364384971c4cdfd66b4a2f0696d4)

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

# Conflicts:
#	include/uapi/linux/aufs_type.h

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

# Conflicts:
#	include/uapi/linux/aufs_type.h

Signed-off-by: J. R. Okajima <hooanon05g@gmail.com>
(cherry picked from commit 0f5f91bda77d0690c23732fd2592ae97c908a704)

Signed-off-by: J. R. Okajima <hooanon05g@gmail.com>
(cherry picked from commit 9e47f923ad8bf55c272fed3d3699fa5df14b6f72)

Signed-off-by: J. R. Okajima <hooanon05g@gmail.com>
(cherry picked from commit 7555811a8741218089016a6abed15a440baca476)

Signed-off-by: J. R. Okajima <hooanon05g@gmail.com>
(cherry picked from commit 75664fa01701d5f79e6cee87a800354df6e70f70)

These "+1" were left accidentally when refining the lookup routine.
Signed-off-by: J. R. Okajima <hooanon05g@gmail.com>
(cherry picked from commit 4177c438179671556de7312107c8aa766ea3d658)

Signed-off-by: J. R. Okajima <hooanon05g@gmail.com>
(cherry picked from commit 2c79658cfdc070c6fc4ea5ac3ef898f2b15fb2f3)

When a branch filesystem doesn't cache ACL, aufs should not cache
either.  Until now aufs has never met such fs, but theoretically it
could happen.  Actually, in linux-v5.1-rc1, NFSv3 changed its behaviour
by the commit
	ded52fbe7020 2019-02-20 nfs: fix xfstest generic/099 failed on nfsv3
The commit ded52fbe7020 doesn't "forget" the previous acl though.
Doesn't it mean that the obsoleted acl is kept until NFS's attribute
cache is expired?  I don't know.  I've asked it on LKML, but got no
answer.
Signed-off-by: J. R. Okajima <hooanon05g@gmail.com>
(cherry picked from commit e448daa00228186b869356fdef8d98d9f95caf53)

A compilation -Wimplicit-fallthrough warning was enabled by commit
a035d552a93b ("Makefile: Globally enable fall-through warning")
and triggers the following warning.

fs/aufs/opts.h:78:11:
warning: this statement may fall through [-Wimplicit-fallthrough=]

This patch adds comments according GNU manual.
https://gcc.gnu.org/onlinedocs/gcc/Warning-Options.html#Warning-Options

Signed-off-by: He Zhe <zhe.he@windriver.com>
See-also: https://www.mail-archive.com/aufs-users@lists.sourceforge.net/msg05685.html
(cherry picked from commit e7619996b014c5d8fd2f6ad89542c545a207667f)

Add missing break statement for case Opt_wsum in au_opt_simple.
Signed-off-by: He Zhe <zhe.he@windriver.com>
See-also: https://www.mail-archive.com/aufs-users@lists.sourceforge.net/msg05684.html
(cherry picked from commit 9e7d29356ab57fa5db7e92e51267176e50c1497c)

This is detected by the commit in v5.3-rc1,
	d6fc9fcbaa65 2019-07-08 kbuild: compile-test exported headers to
		ensure they are self-contained
But the issue is not for v5.3-rc1 only I am afraid.  So this commit is
brought to aufs4.14 which is my current development base.
Signed-off-by: J. R. Okajima <hooanon05g@gmail.com>
(cherry picked from commit d38615f7fef1c65e30e3cc418daa9e19c93ed98f)

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

Signed-off-by: J. R. Okajima <hooanon05g@gmail.com>
(cherry picked from commit 4596850541ed7144f7fea951d02f0f6251c4a997)

The scenario is very similar to previous commit
"aufs: bugfix, ignore the being freed dynop object".
One exception is that this commit is for sbinfo object which is managed
by kobject (instead of kref).

In order to enter the plink-maintenance mode, users write an ID to
"/proc/fs/aufs/plink_maint" (this path is defined as macros in
include/uapi/linux/aufs_type.h).  If someone else is unmounting the
aufs mount corresponding that ID, then the searcher task may find a
being freed sbinfo object.
The problem and the fix is very similar to previous commit
"aufs: bugfix, ignore the being freed dynop object".
Signed-off-by: J. R. Okajima <hooanon05g@gmail.com>
(cherry picked from commit 949b498ae30797b19b9e7ac9b230815f31ffe378)