aufs: for linux-3.15, follow the removal of DEBUG_WRITECOUNT

Signed-off-by: J. R. Okajima <hooanon05g@gmail.com>
aufs: for linux-3.15, address_space_operations->is_partially_uptodate() changed

Signed-off-by: J. R. Okajima <hooanon05g@gmail.com>
Merge branch 'aufs3.x-rcN/00base' into aufs3.x-rcN/01modular
Merge branch 'aufs3.x-rcN/01modular' into aufs3.x-rcN/30stdalone
aufs: for linux-3.15, support for FS_DELETE in NFS silly-rename

By the commit
f7be728 2014-03-17 nfs: emit a fsnotify_nameremove call in sillyrename codepath
NFS fires the event by itself (while the event is fired by VFS usually).
Additionally NFS lets kworker to fire. This is an unexpected situation
for aufs since aufs handles the event asynchronously which means calling
kworker. But this will not cause a deadlock since aufs lets kworker
asynchronously (if aufs made it synchronously, then a deadlock would
happen).

Anyway a notify from kworker is unexpected for aufs and it produces a
warning when CONFIG_AUFS_DEBUG is enabled. This commit allows the nested
kworker call when the target is on NFS and the event is FS_DELETE, but a
minor warning is left.

Signed-off-by: J. R. Okajima <hooanon05g@gmail.com>
Merge branch 'aufs3.x-rcN/00base' into aufs3.x-rcN/01modular
Merge branch 'aufs3.x-rcN/01modular' into aufs3.x-rcN/30stdalone
Merge branch 'aufs3.x-rcN/30stdalone' into aufs3.x-rcN/39public
aufs3.x-rcN 20140421

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