From jeffm@suse.com  Fri Jun 16 14:56:32 2017
From: Jeff Mahoney <jeffm@suse.com>
Subject: btrfs: backref, add unode_aux_to_inode_list helper
References: bsc#974590 bsc#1030061 bsc#1022914 bsc#1017461
Patch-mainline: v4.14-rc1
Git-commit: 4dae077a83dd8944ed351b09a0651c1283f46185


Replacing the double cast and ternary conditional with a helper makes
the code easier on the eyes.

Signed-off-by: Jeff Mahoney <jeffm@suse.com>
---
 fs/btrfs/backref.c | 16 +++++++++++-----
 1 file changed, 11 insertions(+), 5 deletions(-)

diff --git a/fs/btrfs/backref.c b/fs/btrfs/backref.c
index 3c70dda..7dfb035 100644
--- a/fs/btrfs/backref.c
+++ b/fs/btrfs/backref.c
@@ -422,6 +422,14 @@ static int __resolve_indirect_ref(struct btrfs_fs_info *fs_info,
 	return ret;
 }
 
+static struct extent_inode_elem *
+unode_aux_to_inode_list(struct ulist_node *node)
+{
+	if (!node)
+		return NULL;
+	return (struct extent_inode_elem *)(uintptr_t)node->aux;
+}
+
 /*
  * resolve all indirect backrefs from the list
  */
@@ -476,8 +484,7 @@ static int __resolve_indirect_refs(struct btrfs_fs_info *fs_info,
 		ULIST_ITER_INIT(&uiter);
 		node = ulist_next(parents, &uiter);
 		ref->parent = node ? node->val : 0;
-		ref->inode_list = node ?
-			(struct extent_inode_elem *)(uintptr_t)node->aux : NULL;
+		ref->inode_list = unode_aux_to_inode_list(node);
 
 		/* additional parents require new refs being added here */
 		while ((node = ulist_next(parents, &uiter))) {
@@ -489,8 +496,7 @@ static int __resolve_indirect_refs(struct btrfs_fs_info *fs_info,
 			}
 			memcpy(new_ref, ref, sizeof(*ref));
 			new_ref->parent = node->val;
-			new_ref->inode_list = (struct extent_inode_elem *)
-							(uintptr_t)node->aux;
+			new_ref->inode_list = unode_aux_to_inode_list(node);
 			list_add(&new_ref->list, &ref->list);
 		}
 		ulist_reinit(parents);
@@ -1134,7 +1140,7 @@ static void free_leaf_list(struct ulist *blocks)
 	while ((node = ulist_next(blocks, &uiter))) {
 		if (!node->aux)
 			continue;
-		eie = (struct extent_inode_elem *)(uintptr_t)node->aux;
+		eie = unode_aux_to_inode_list(node);
 		free_inode_elem_list(eie);
 		node->aux = 0;
 	}
-- 
2.10.2


