To actually use it, we first have to copy symbols over from the dlm build
into the scoutfs source directory. Make that happen automatically for us in
the Makefile.
The only users of locking at the moment are mount, unmount and xattr
read/write. Adding more locking calls should be a straight-forward endeavor.
The LVB based server ip communication didn't work out, and LVBS as they are
written don't make sense in a range locking world. So instead, we record the
server ip address in the superblock. This is protected by the listen lock,
which also arbitrates which node will be the manifest server.
We take and drop the dlm lock on each lock/unlock call. Lock caching will
come in a future patch.
Signed-off-by: Mark Fasheh <mfasheh@versity.com>
e711c15acf