ocfs2: have ocfs2_extend_trans() take handle_t

No reason to use our wrapper struct in this function, so take the handle_t
directly.

Also fixes a bug where we were incorrectly setting the handle to NULL in
case of a failure from journal_restart()

Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>

fs/ocfs2/alloc.c

@@ -1074,7 +1074,7 @@ static int ocfs2_replay_truncate_records(struct ocfs2_super *osb,
 		/* TODO: Perhaps we can calculate the bulk of the
 		 * credits up front rather than extending like
 		 * this. */
-		status = ocfs2_extend_trans(handle,
+		status = ocfs2_extend_trans(handle->k_handle,
 					    OCFS2_TRUNCATE_LOG_FLUSH_ONE_REC);
 		if (status < 0) {
 			mlog_errno(status);

fs/ocfs2/file.c

@@ -566,7 +566,7 @@ static int ocfs2_extend_allocation(struct inode *inode,
 			credits = ocfs2_calc_extend_credits(osb->sb,
 							    fe,
 							    clusters_to_add);
-			status = ocfs2_extend_trans(handle, credits);
+			status = ocfs2_extend_trans(handle->k_handle, credits);
 			if (status < 0) {
 				/* handle still has to be committed at
 				 * this point. */

fs/ocfs2/journal.c

@@ -323,30 +323,27 @@ void ocfs2_commit_trans(struct ocfs2_journal_handle *handle)
  * good because transaction ids haven't yet been recorded on the
  * cluster locks associated with this handle.
  */
-int ocfs2_extend_trans(struct ocfs2_journal_handle *handle,
-		       int nblocks)
+int ocfs2_extend_trans(handle_t *handle, int nblocks)
 {
 	int status;
 
 	BUG_ON(!handle);
-	BUG_ON(!(handle->flags & OCFS2_HANDLE_STARTED));
 	BUG_ON(!nblocks);
 
 	mlog_entry_void();
 
 	mlog(0, "Trying to extend transaction by %d blocks\n", nblocks);
 
-	status = journal_extend(handle->k_handle, nblocks);
+	status = journal_extend(handle, nblocks);
 	if (status < 0) {
 		mlog_errno(status);
 		goto bail;
 	}
 
 	if (status > 0) {
 		mlog(0, "journal_extend failed, trying journal_restart\n");
-		status = journal_restart(handle->k_handle, nblocks);
+		status = journal_restart(handle, nblocks);
 		if (status < 0) {
-			handle->k_handle = NULL;
 			mlog_errno(status);
 			goto bail;
 		}

fs/ocfs2/journal.h

@@ -264,8 +264,7 @@ struct ocfs2_journal_handle *ocfs2_start_trans(struct ocfs2_super *osb,
 					       struct ocfs2_journal_handle *handle,
 					       int max_buffs);
 void			     ocfs2_commit_trans(struct ocfs2_journal_handle *handle);
-int			     ocfs2_extend_trans(struct ocfs2_journal_handle *handle,
-						int nblocks);
+int			     ocfs2_extend_trans(handle_t *handle, int nblocks);
 
 /*
  * Create access is for when we get a newly created buffer and we're