[PATCH 4/4] libxfs: add a xattr_entry helper

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

From: Darrick J. Wong <djwong@xxxxxxxxxx>

Add a helper to translate from the item list head to the attr_intent
item structure and use it so shorten assignments and avoid the need for
extra local variables.

Inspired-by: Christoph Hellwig <hch@xxxxxx>
Signed-off-by: Darrick J. Wong <djwong@xxxxxxxxxx>
---
 libxfs/defer_item.c |   15 ++++++++++-----
 1 file changed, 10 insertions(+), 5 deletions(-)


diff --git a/libxfs/defer_item.c b/libxfs/defer_item.c
index 36811c7fece1..fdb922f08c39 100644
--- a/libxfs/defer_item.c
+++ b/libxfs/defer_item.c
@@ -570,6 +570,13 @@ const struct xfs_defer_op_type xfs_bmap_update_defer_type = {
 	.cancel_item	= xfs_bmap_update_cancel_item,
 };
 
+/* Logged extended attributes */
+
+static inline struct xfs_attr_intent *attri_entry(const struct list_head *e)
+{
+	return list_entry(e, struct xfs_attr_intent, xattri_list);
+}
+
 /* Get an ATTRI. */
 static struct xfs_log_item *
 xfs_attr_create_intent(
@@ -618,11 +625,10 @@ xfs_attr_finish_item(
 	struct list_head	*item,
 	struct xfs_btree_cur	**state)
 {
-	struct xfs_attr_intent	*attr;
-	int			error;
+	struct xfs_attr_intent	*attr = attri_entry(item);
 	struct xfs_da_args	*args;
+	int			error;
 
-	attr = container_of(item, struct xfs_attr_intent, xattri_list);
 	args = attr->xattri_da_args;
 
 	/*
@@ -651,9 +657,8 @@ static void
 xfs_attr_cancel_item(
 	struct list_head	*item)
 {
-	struct xfs_attr_intent	*attr;
+	struct xfs_attr_intent	*attr = attri_entry(item);
 
-	attr = container_of(item, struct xfs_attr_intent, xattri_list);
 	xfs_attr_free_item(attr);
 }