xfs: kill xfs_ialloc_pagi_init()

This is just a basic wrapper around xfs_ialloc_read_agi(), which can
be entirely handled by xfs_ialloc_read_agi() by passing a NULL
agibpp....
Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>

fs/xfs/libxfs/xfs_ag.c

@@ -128,9 +128,10 @@ xfs_initialize_perag_data(
 		if (error)
 			return error;
 
-		error = xfs_ialloc_pagi_init(mp, NULL, index);
+		error = xfs_ialloc_read_agi(mp, NULL, index, NULL);
 		if (error)
 			return error;
+
 		pag = xfs_perag_get(mp, index);
 		ifree += pag->pagi_freecount;
 		ialloc += pag->pagi_count;

fs/xfs/libxfs/xfs_ialloc.c

@@ -1610,7 +1610,7 @@ xfs_dialloc_good_ag(
 		return false;
 
 	if (!pag->pagi_init) {
-		error = xfs_ialloc_pagi_init(mp, tp, pag->pag_agno);
+		error = xfs_ialloc_read_agi(mp, tp, pag->pag_agno, NULL);
 		if (error)
 			return false;
 	}
@@ -2593,25 +2593,30 @@ xfs_read_agi(
 	return 0;
 }
 
+/*
+ * Read in the agi and initialise the per-ag data. If the caller supplies a
+ * @agibpp, return the locked AGI buffer to them, otherwise release it.
+ */
 int
 xfs_ialloc_read_agi(
 	struct xfs_mount	*mp,	/* file system mount structure */
 	struct xfs_trans	*tp,	/* transaction pointer */
 	xfs_agnumber_t		agno,	/* allocation group number */
-	struct xfs_buf		**bpp)	/* allocation group hdr buf */
+	struct xfs_buf		**agibpp)
 {
+	struct xfs_buf		*agibp;
 	struct xfs_agi		*agi;	/* allocation group header */
 	struct xfs_perag	*pag;	/* per allocation group data */
 	int			error;
 
 	trace_xfs_ialloc_read_agi(mp, agno);
 
-	error = xfs_read_agi(mp, tp, agno, bpp);
+	error = xfs_read_agi(mp, tp, agno, &agibp);
 	if (error)
 		return error;
 
-	agi = (*bpp)->b_addr;
-	pag = (*bpp)->b_pag;
+	agi = agibp->b_addr;
+	pag = agibp->b_pag;
 	if (!pag->pagi_init) {
 		pag->pagi_freecount = be32_to_cpu(agi->agi_freecount);
 		pag->pagi_count = be32_to_cpu(agi->agi_count);
@@ -2624,26 +2629,10 @@ xfs_ialloc_read_agi(
 	 */
 	ASSERT(pag->pagi_freecount == be32_to_cpu(agi->agi_freecount) ||
 		xfs_is_shutdown(mp));
-	return 0;
-}
-
-/*
- * Read in the agi to initialise the per-ag data in the mount structure
- */
-int
-xfs_ialloc_pagi_init(
-	xfs_mount_t	*mp,		/* file system mount structure */
-	xfs_trans_t	*tp,		/* transaction pointer */
-	xfs_agnumber_t	agno)		/* allocation group number */
-{
-	struct xfs_buf	*bp = NULL;
-	int		error;
-
-	error = xfs_ialloc_read_agi(mp, tp, agno, &bp);
-	if (error)
-		return error;
-	if (bp)
-		xfs_trans_brelse(tp, bp);
+	if (agibpp)
+		*agibpp = agibp;
+	else
+		xfs_trans_brelse(tp, agibp);
 	return 0;
 }
 

fs/xfs/libxfs/xfs_ialloc.h

@@ -72,16 +72,6 @@ xfs_ialloc_read_agi(
 	xfs_agnumber_t	agno,		/* allocation group number */
 	struct xfs_buf	**bpp);		/* allocation group hdr buf */
 
-/*
- * Read in the allocation group header to initialise the per-ag data
- * in the mount structure
- */
-int
-xfs_ialloc_pagi_init(
-	struct xfs_mount *mp,		/* file system mount structure */
-	struct xfs_trans *tp,		/* transaction pointer */
-        xfs_agnumber_t  agno);		/* allocation group number */
-
 /*
  * Lookup a record by ino in the btree given by cur.
  */