aufs: bugfix, retval from au_pin() call in au_file_refresh_by_inode()

Simply it is a bug to call au_unpin() when the precedding au_pin()
returns an error.
To be honest, I was very surprised that this bug was born in aufs1 era
and lived very long time.

Signed-off-by: J. R. Okajima <hooanon05@yahoo.co.jp>
Merge branch 'aufs3.2/00base' into aufs3.2/01modular
Merge branch 'aufs3.2/01modular' into aufs3.2/30stdalone
aufs: tiny, new copy-up wrapper with h_open_pre/post()

It is possible to add a new copy-up flag AuCpup_HOPEN or something, but
I choose another way. It is required to add a new parameter to specify
the branch index, but I don't think it a good idea to add one more
parameter to au_sio_cpup_simple().

The behaviour doesn't change.

Signed-off-by: J. R. Okajima <hooanon05@yahoo.co.jp>
Merge branch 'aufs3.2/00base' into aufs3.2/01modular
Merge branch 'aufs3.2/01modular' into aufs3.2/30stdalone
Merge branch 'aufs3.2/30stdalone' into aufs3.2/39public
aufs3.2 20130708

Signed-off-by: J. R. Okajima <hooanon05@yahoo.co.jp>
aufs: bugfix, clear S_AUTOMOUNT

Aufs inode should not copy-up the inode S_AUTOMOUNT flag from its branch
inode. The S_AUTOMOUNT flag was introduced in linux-2.6.38, so this is a
long-lived bug.
Currently (linux-3.11-rc1 mainline), this flag is set only for
- Andrew File System support (AFS)
- CIFS (CIFS_FATTR_DFS_REFERRAL case only)
- NFS (NFS_ATTR_FATTR_MOUNTPOINT or NFS_ATTR_FATTR_V4_REFERRAL case only)
and I have never tested such branches.
Found and reported by Ken Elkabany and Aaron Staley who are using
OpenAFS (out of mainline) as an aufs branch.

Reported-by: Ken Elkabany <ken@picloud.com>
Reported-by: Aaron Staley <aaron@picloud.com>
Signed-off-by: J. R. Okajima <hooanon05@yahoo.co.jp>
aufs: update the donator list

Signed-off-by: J. R. Okajima <hooanon05@yahoo.co.jp>
Merge branch 'aufs3.2/00base' into aufs3.2/01modular
Merge branch 'aufs3.2/01modular' into aufs3.2/30stdalone
Merge branch 'aufs3.2/30stdalone' into aufs3.2/39public
aufs3.2 20130722

Signed-off-by: J. R. Okajima <hooanon05@yahoo.co.jp>