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Aufs has an internal debugging feature which uses LOCKDEP.
Without LOCKDEP, aufs cannot get the correct lock status.  As a
result, BUG_ON() was called unexpectedly.
In other words, with the configuration of CONFIG_AUFS_DEBUG enabled
and CONFIG_LOCKDEP disabled, a bug appears.
Reported-by: "Zhengyuan Liu" <liuzhengyuan@g.ycsipg.com>
See-also: https://www.mail-archive.com/aufs-users@lists.sourceforge.net/msg05829.html

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

By the commit in mainline v5.11-rc1,
cd539cff9470f 2020-11-02 lockdep: Provide dummy forward declaration of
	*_is_held() helpers
aufs has to introduce a workaround in case of !LOCKDEP to call
*_is_held() helpers.
Signed-off-by: J. R. Okajima <hooanon05g@gmail.com>

This reverts commit 7ab47e64.

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

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

Finally set_fs() is gone by the commit,
	3c57fa13f6bf3 2020-10-04 asm-generic: make the set_fs implementation optional
Now aufs removes all [gs]et_fs() calls.  It heavily affects XINO file
I/O and some others.
Signed-off-by: J. R. Okajima <hooanon05g@gmail.com>

By the previous commit,
	51958525b3fd9 2020-12-22 for aufs: linux-v5.10-rc1, no more vfs_(read|write)f_t
f_op->read() and ->write() are less meaningful.
Now aufs totally removes them.
Signed-off-by: J. R. Okajima <hooanon05g@gmail.com>

This reverts commit 0cee3681806d91d669342f03901e35a7ad722b7c.

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

Simply follows the commit in mainline,
b54cecf5e2293 2020-07-27 fsnotify: pass dir argument to handle_event() callback
Signed-off-by: J. R. Okajima <hooanon05g@gmail.com>

This reverts commit 8fe88b55f2829abb4149e38a15493d004b9a4307.

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

simply follows
8151b4c8bee43 2020-06-02 mm: add readahead address space operation
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>

This reverts commit 553ac776.

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

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