[PATCH 053/110] xfs: fold xfs_allocbt_init_common into xfs_allocbt_init_cursor

["Darrick J. Wong" <djwong@xxxxxxxxxx>]

From: Christoph Hellwig <hch@xxxxxx>

Source kernel commit: fb518f8eeb90197624b21a3429e57b6a65bff7bb

Make the levels initialization in xfs_allocbt_init_cursor conditional
and merge the two helpers.

Signed-off-by: Christoph Hellwig <hch@xxxxxx>
Reviewed-by: Darrick J. Wong <djwong@xxxxxxxxxx>
Signed-off-by: Darrick J. Wong <djwong@xxxxxxxxxx>
---
 libxfs/xfs_alloc_btree.c |   42 +++++++++++++++---------------------------
 1 file changed, 15 insertions(+), 27 deletions(-)


diff --git a/libxfs/xfs_alloc_btree.c b/libxfs/xfs_alloc_btree.c
index 6b17037f807d..13d2310cfa36 100644
--- a/libxfs/xfs_alloc_btree.c
+++ b/libxfs/xfs_alloc_btree.c
@@ -511,11 +511,16 @@ const struct xfs_btree_ops xfs_cntbt_ops = {
 	.keys_contiguous	= NULL, /* not needed right now */
 };
 
-/* Allocate most of a new allocation btree cursor. */
-STATIC struct xfs_btree_cur *
-xfs_allocbt_init_common(
+/*
+ * Allocate a new allocation btree cursor.
+ *
+ * For staging cursors tp and agbp are NULL.
+ */
+struct xfs_btree_cur *
+xfs_allocbt_init_cursor(
 	struct xfs_mount	*mp,
 	struct xfs_trans	*tp,
+	struct xfs_buf		*agbp,
 	struct xfs_perag	*pag,
 	xfs_btnum_t		btnum)
 {
@@ -530,31 +535,14 @@ xfs_allocbt_init_common(
 	cur = xfs_btree_alloc_cursor(mp, tp, btnum, ops, mp->m_alloc_maxlevels,
 			xfs_allocbt_cur_cache);
 	cur->bc_ag.pag = xfs_perag_hold(pag);
-	return cur;
-}
-
-/*
- * Allocate a new allocation btree cursor.
- */
-struct xfs_btree_cur *			/* new alloc btree cursor */
-xfs_allocbt_init_cursor(
-	struct xfs_mount	*mp,		/* file system mount point */
-	struct xfs_trans	*tp,		/* transaction pointer */
-	struct xfs_buf		*agbp,		/* buffer for agf structure */
-	struct xfs_perag	*pag,
-	xfs_btnum_t		btnum)		/* btree identifier */
-{
-	struct xfs_agf		*agf = agbp->b_addr;
-	struct xfs_btree_cur	*cur;
-
-	cur = xfs_allocbt_init_common(mp, tp, pag, btnum);
-	if (btnum == XFS_BTNUM_CNT)
-		cur->bc_nlevels = be32_to_cpu(agf->agf_levels[XFS_BTNUM_CNT]);
-	else
-		cur->bc_nlevels = be32_to_cpu(agf->agf_levels[XFS_BTNUM_BNO]);
-
 	cur->bc_ag.agbp = agbp;
+	if (agbp) {
+		struct xfs_agf		*agf = agbp->b_addr;
 
+		cur->bc_nlevels = (btnum == XFS_BTNUM_BNO) ?
+			be32_to_cpu(agf->agf_levels[XFS_BTNUM_BNO]) :
+			be32_to_cpu(agf->agf_levels[XFS_BTNUM_CNT]);
+	}
 	return cur;
 }
 
@@ -568,7 +556,7 @@ xfs_allocbt_stage_cursor(
 {
 	struct xfs_btree_cur	*cur;
 
-	cur = xfs_allocbt_init_common(mp, NULL, pag, btnum);
+	cur = xfs_allocbt_init_cursor(mp, NULL, NULL, pag, btnum);
 	xfs_btree_stage_afakeroot(cur, afake);
 	return cur;
 }