GitLab

Provide info about the branches, which will be used from user-space.
This is essentially equivalent to the entries under sysfs
(/sys/fs/aufs/si_*/).
But the ioctl behaviour is atomic and never confuse the matching of the
branch id.
Signed-off-by: J. R. Okajima <hooanon05g@gmail.com>

Provide a file descriptor corresponding the specified writable branch.
The file descriptor will be used from user-space such as FHSM and
libau.so. For details, see aufs-util.git.
Signed-off-by: J. R. Okajima <hooanon05g@gmail.com>