xfs: split xfs_allocbt_init_cursor

Split xfs_allocbt_init_cursor into separate routines for the by-bno
and by-cnt btrees to prepare for the removal of the xfs_btnum global
enumeration of btree types.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Darrick J. Wong <djwong@kernel.org>

1 files changed, 44 insertions, 18 deletions

diff --git a/fs/xfs/libxfs/xfs_alloc_btree.c b/fs/xfs/libxfs/xfs_alloc_btree.c
index e0b0cdd8f344..722863464289 100644
--- a/fs/xfs/libxfs/xfs_alloc_btree.c
+++ b/fs/xfs/libxfs/xfs_alloc_btree.c
@@ -24,13 +24,22 @@
 static struct kmem_cache	*xfs_allocbt_cur_cache;
 
 STATIC struct xfs_btree_cur *
-xfs_allocbt_dup_cursor(
+xfs_bnobt_dup_cursor(
 	struct xfs_btree_cur	*cur)
 {
-	return xfs_allocbt_init_cursor(cur->bc_mp, cur->bc_tp,
-			cur->bc_ag.agbp, cur->bc_ag.pag, cur->bc_btnum);
+	return xfs_bnobt_init_cursor(cur->bc_mp, cur->bc_tp, cur->bc_ag.agbp,
+			cur->bc_ag.pag);
 }
 
+STATIC struct xfs_btree_cur *
+xfs_cntbt_dup_cursor(
+	struct xfs_btree_cur	*cur)
+{
+	return xfs_cntbt_init_cursor(cur->bc_mp, cur->bc_tp, cur->bc_ag.agbp,
+			cur->bc_ag.pag);
+}
+
+
 STATIC void
 xfs_allocbt_set_root(
 	struct xfs_btree_cur		*cur,
@@ -480,7 +489,7 @@ const struct xfs_btree_ops xfs_bnobt_ops = {
 	.statoff		= XFS_STATS_CALC_INDEX(xs_abtb_2),
 	.sick_mask		= XFS_SICK_AG_BNOBT,
 
-	.dup_cursor		= xfs_allocbt_dup_cursor,
+	.dup_cursor		= xfs_bnobt_dup_cursor,
 	.set_root		= xfs_allocbt_set_root,
 	.alloc_block		= xfs_allocbt_alloc_block,
 	.free_block		= xfs_allocbt_free_block,
@@ -512,7 +521,7 @@ const struct xfs_btree_ops xfs_cntbt_ops = {
 	.statoff		= XFS_STATS_CALC_INDEX(xs_abtc_2),
 	.sick_mask		= XFS_SICK_AG_CNTBT,
 
-	.dup_cursor		= xfs_allocbt_dup_cursor,
+	.dup_cursor		= xfs_cntbt_dup_cursor,
 	.set_root		= xfs_allocbt_set_root,
 	.alloc_block		= xfs_allocbt_alloc_block,
 	.free_block		= xfs_allocbt_free_block,
@@ -532,36 +541,53 @@ const struct xfs_btree_ops xfs_cntbt_ops = {
 };
 
 /*
- * Allocate a new allocation btree cursor.
+ * Allocate a new bnobt cursor.
  *
  * For staging cursors tp and agbp are NULL.
  */
 struct xfs_btree_cur *
-xfs_allocbt_init_cursor(
+xfs_bnobt_init_cursor(
 	struct xfs_mount	*mp,
 	struct xfs_trans	*tp,
 	struct xfs_buf		*agbp,
-	struct xfs_perag	*pag,
-	xfs_btnum_t		btnum)
+	struct xfs_perag	*pag)
 {
-	const struct xfs_btree_ops *ops = &xfs_bnobt_ops;
 	struct xfs_btree_cur	*cur;
 
-	ASSERT(btnum == XFS_BTNUM_BNO || btnum == XFS_BTNUM_CNT);
+	cur = xfs_btree_alloc_cursor(mp, tp, XFS_BTNUM_BNO, &xfs_bnobt_ops,
+			mp->m_alloc_maxlevels, xfs_allocbt_cur_cache);
+	cur->bc_ag.pag = xfs_perag_hold(pag);
+	cur->bc_ag.agbp = agbp;
+	if (agbp) {
+		struct xfs_agf		*agf = agbp->b_addr;
+
+		cur->bc_nlevels = be32_to_cpu(agf->agf_bno_level);
+	}
+	return cur;
+}
 
-	if (btnum == XFS_BTNUM_CNT)
-		ops = &xfs_cntbt_ops;
+/*
+ * Allocate a new cntbt cursor.
+ *
+ * For staging cursors tp and agbp are NULL.
+ */
+struct xfs_btree_cur *
+xfs_cntbt_init_cursor(
+	struct xfs_mount	*mp,
+	struct xfs_trans	*tp,
+	struct xfs_buf		*agbp,
+	struct xfs_perag	*pag)
+{
+	struct xfs_btree_cur	*cur;
 
-	cur = xfs_btree_alloc_cursor(mp, tp, btnum, ops, mp->m_alloc_maxlevels,
-			xfs_allocbt_cur_cache);
+	cur = xfs_btree_alloc_cursor(mp, tp, XFS_BTNUM_CNT, &xfs_cntbt_ops,
+			mp->m_alloc_maxlevels, xfs_allocbt_cur_cache);
 	cur->bc_ag.pag = xfs_perag_hold(pag);
 	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_bno_level) :
-			be32_to_cpu(agf->agf_cnt_level);
+		cur->bc_nlevels = be32_to_cpu(agf->agf_cnt_level);
 	}
 	return cur;
 }