xfs: return committed status from xfs_trans_roll()

Some callers need to make error handling decisions based on whether
the current transaction successfully committed or not. Rename
xfs_trans_roll(), add a new parameter and provide a wrapper to
preserve existing callers.

Signed-off-by: Brian Foster <[e-mail]>
Reviewed-by: Christoph Hellwig <[e-mail]>
Signed-off-by: Dave Chinner <[e-mail]>

fs/xfs/xfs_trans.c

···
  * chunk we've been working on and get a new transaction to continue.
  */
 int
-xfs_trans_roll(
+__xfs_trans_roll(
 	struct xfs_trans	**tpp,
-	struct xfs_inode	*dp)
+	struct xfs_inode	*dp,
+	int			*committed)
 {
 	struct xfs_trans	*trans;
 	struct xfs_trans_res	tres;
···
 	if (error)
 		return error;
 
+	*committed = 1;
 	trans = *tpp;
 
 	/*
···
 	if (dp)
 		xfs_trans_ijoin(trans, dp, 0);
 	return 0;
+}
+
+int
+xfs_trans_roll(
+	struct xfs_trans	**tpp,
+	struct xfs_inode	*dp)
+{
+	int			committed = 0;
+	return __xfs_trans_roll(tpp, dp, &committed);
 }

fs/xfs/xfs_trans.h

···
 					 xfs_fsblock_t,
 					 xfs_extlen_t);
 int		xfs_trans_commit(struct xfs_trans *);
+int		__xfs_trans_roll(struct xfs_trans **, struct xfs_inode *, int *);
 int		xfs_trans_roll(struct xfs_trans **, struct xfs_inode *);
 void		xfs_trans_cancel(xfs_trans_t *);
 int		xfs_trans_ail_init(struct xfs_mount *);