xfs: clean up buffer allocation

Change _xfs_buf_initialize to allocate the buffer directly and rename it to
xfs_buf_alloc now that is the only buffer allocation routine.  Also remove
the xfs_buf_deallocate wrapper around the kmem_zone_free calls for buffers.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Alex Elder <aelder@sgi.com>


diff --git a/fs/xfs/xfs_log.c b/fs/xfs/xfs_log.c
index 493447d..8c9db4e 100644
--- a/fs/xfs/xfs_log.c
+++ b/fs/xfs/xfs_log.c
@@ -1047,7 +1047,7 @@
 	xlog_get_iclog_buffer_size(mp, log);
 
 	error = ENOMEM;
-	bp = xfs_buf_get_empty(log->l_iclog_size, mp->m_logdev_targp);
+	bp = xfs_buf_alloc(mp->m_logdev_targp, 0, log->l_iclog_size, 0);
 	if (!bp)
 		goto out_free_log;
 	bp->b_iodone = xlog_iodone;