ocfs2: Remove struct ocfs2_journal_handle in favor of handle_t

This is mostly a search and replace as ocfs2_journal_handle is now no more
than a container for a handle_t pointer.

ocfs2_commit_trans() becomes very straight forward, and we remove some out
of date comments / code.

Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>
diff --git a/fs/ocfs2/file.h b/fs/ocfs2/file.h
index 740c9e7..84f8b97 100644
--- a/fs/ocfs2/file.h
+++ b/fs/ocfs2/file.h
@@ -41,7 +41,7 @@
 			       struct inode *inode,
 			       u32 clusters_to_add,
 			       struct buffer_head *fe_bh,
-			       struct ocfs2_journal_handle *handle,
+			       handle_t *handle,
 			       struct ocfs2_alloc_context *data_ac,
 			       struct ocfs2_alloc_context *meta_ac,
 			       enum ocfs2_alloc_restarted *reason);
@@ -49,7 +49,7 @@
 int ocfs2_getattr(struct vfsmount *mnt, struct dentry *dentry,
 		  struct kstat *stat);
 
-int ocfs2_set_inode_size(struct ocfs2_journal_handle *handle,
+int ocfs2_set_inode_size(handle_t *handle,
 			 struct inode *inode,
 			 struct buffer_head *fe_bh,
 			 u64 new_i_size);