[PATCH 3/3] xfs: factor out xfs_attr3_leaf_init

[Andrey Albershteyn <aalbersh@kernel.org>]

From: Long Li <leo.lilong@huawei.com>

Source kernel commit: e65bb55d7f8c2041c8fdb73cd29b0b4cad4ed847

Factor out wrapper xfs_attr3_leaf_init function, which exported for
external use.

Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Long Li <leo.lilong@huawei.com>
Signed-off-by: Carlos Maiolino <cem@kernel.org>
Signed-off-by: Andrey Albershteyn <aalbersh@kernel.org>
---
 libxfs/xfs_attr_leaf.c | 22 ++++++++++++++++++++++
 libxfs/xfs_attr_leaf.h |  3 +++
 2 files changed, 25 insertions(+)

diff --git a/libxfs/xfs_attr_leaf.c b/libxfs/xfs_attr_leaf.c
index 90be21a38876..6aaa7ff10959 100644
--- a/libxfs/xfs_attr_leaf.c
+++ b/libxfs/xfs_attr_leaf.c
@@ -1412,6 +1412,28 @@ xfs_attr3_leaf_create(
 	return 0;
 }
 
+/*
+ * Reinitialize an existing attr fork block as an empty leaf, and attach
+ * the buffer to tp.
+ */
+int
+xfs_attr3_leaf_init(
+	struct xfs_trans	*tp,
+	struct xfs_inode	*dp,
+	xfs_dablk_t		blkno)
+{
+	struct xfs_buf		*bp = NULL;
+	struct xfs_da_args	args = {
+		.trans		= tp,
+		.dp		= dp,
+		.owner		= dp->i_ino,
+		.geo		= dp->i_mount->m_attr_geo,
+	};
+
+	ASSERT(tp != NULL);
+
+	return xfs_attr3_leaf_create(&args, blkno, &bp);
+}
 /*
  * Split the leaf node, rebalance, then add the new entry.
  *
diff --git a/libxfs/xfs_attr_leaf.h b/libxfs/xfs_attr_leaf.h
index aca46da2bc50..72639efe6ac3 100644
--- a/libxfs/xfs_attr_leaf.h
+++ b/libxfs/xfs_attr_leaf.h
@@ -87,6 +87,9 @@ int	xfs_attr3_leaf_list_int(struct xfs_buf *bp,
 /*
  * Routines used for shrinking the Btree.
  */
+
+int	xfs_attr3_leaf_init(struct xfs_trans *tp, struct xfs_inode *dp,
+				xfs_dablk_t blkno);
 int	xfs_attr3_leaf_toosmall(struct xfs_da_state *state, int *retval);
 void	xfs_attr3_leaf_unbalance(struct xfs_da_state *state,
 				       struct xfs_da_state_blk *drop_blk,
-- 
2.51.2