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

Signed-off-by: J. R. Okajima <hooanon05g@gmail.com>
(cherry picked from commit 9dbd45984201453ecebcc03a91699878aa38239d)

Signed-off-by: J. R. Okajima <hooanon05g@gmail.com>
(cherry picked from commit 94c692425480664a02aaac3d6f7d496ea1d05c1f)

At the mount-time, XINO files are created and removed very soon.  When
multiple mounts with being given the same XINO file path executed in
parallel, some of them may fail in creating XINO due to EEXIST.
Introducing a local mutex, make it serialized.
By default, XINO is created at the top dir of the first writable
branch.  In this case, the new mutex won't be used.

Obviously this is an unnecessary overhead when the XINO file path is not
same, and such lock should be done by inode_lock() for the parent dir.
Actually au_xino_create2() behaves in this manner.  Then why didn't I
apply the same way to this au_xino_create()?  It is just because of my
laziness.  Calling VFS filp_open() here is easy for me.
Reported-by: Kirill Kolyshkin <kolyshkin@gmail.com>
Signed-off-by: J. R. Okajima <hooanon05g@gmail.com>
(cherry picked from commit 30d9273f2a1ce331b1a79b770bdb4c493919a673)

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

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

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

This reverts commit 181d4988.

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

With a little hope to make it easier to read.
Signed-off-by: J. R. Okajima <hooanon05g@gmail.com>

In mainline, by the commit
	e220140ff624 2019-02-06 fsnotify: remove dirent events from
		FS_EVENTS_POSS_ON_CHILD mask
the macro is redefined, and aufs simply follows it.
Signed-off-by: J. R. Okajima <hooanon05g@gmail.com>

In mainline, by the commit
	71368af9027f 2019-01-29 x86/speculation: Add PR_SPEC_DISABLE_NOEXEC
a new flag is introduced.  And aufs simply follows it.
Signed-off-by: J. R. Okajima <hooanon05g@gmail.com>

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

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

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

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

Although I am not sure module_exit is necessary for the statically
linked module, here is it.  I hope it does no harm.
Signed-off-by: J. R. Okajima <hooanon05g@gmail.com>

They are historical options and a branch attribute.
Signed-off-by: J. R. Okajima <hooanon05g@gmail.com>

Fuse doesn't want the callers to access the inode attributes without
issuing stat, and it is not assured that they are valid after lookup or
iget().
The inode attribute is critical for aufs, and aufs decided to call stat
every time for fuse.
Of course, it makes aufs slow. But when the branch fs is not fuse, stat
is not called.

Currently, only FUSE implements ->poll(), and aufs supports it.
Signed-off-by: J. R. Okajima <hooanon05g@gmail.com>

Basically ramfs is limited for its size, and is not suitable for aufs RW
branch. But people sometimes use it as RW branch without knowing it or
with knowing it.
This configuration is for those who knows what he is doing.
Signed-off-by: J. R. Okajima <hooanon05g@gmail.com>