aufs: tiny, au_qstreq to compare two qstr

Signed-off-by: J. R. Okajima <hooanon05g@gmail.com>
aufs: tiny, no msg in spinlock regeion

Signed-off-by: J. R. Okajima <hooanon05g@gmail.com>
Merge remote-tracking branch 'aufs3-standalone/aufs3.9/00base' into aufs3.9/10static
Merge branch 'aufs3.9/10static' into aufs3.9/11proc_map
Merge branch 'aufs3.9/11proc_map' into aufs3.9/18public
aufs: minor bugfix, correct error value in link(2)

Signed-off-by: J. R. Okajima <hooanon05g@gmail.com>
aufs: refine the description of extra patches

Jan Kara pointed out on LKML saying that NFS-exporting considers not
only i_ino but also i_version, so it won't be a problem if the
uniqueness is lost. Yes, I agree.

Signed-off-by: J. R. Okajima <hooanon05g@gmail.com>
Merge remote-tracking branch 'aufs3-standalone/aufs3.9/00base' into aufs3.9/10static
Merge branch 'aufs3.9/10static' into aufs3.9/11proc_map
Merge branch 'aufs3.9/11proc_map' into aufs3.9/18public