[PATCH 3/12] FS-Cache: Add list_for_each_entry_safe_reverse()

[David Howells]

The attached patch adds list_for_each_entry_safe_reverse() to linux/list.h

Signed-Off-By: David Howells <dhowells@xxxxxxxxxx>
---
warthog>diffstat -p1 list-foreach-saferev-2614mm2.diff
 include/linux/list.h |   14 ++++++++++++++
 1 files changed, 14 insertions(+)

diff -uNrp linux-2.6.14-mm2/include/linux/list.h linux-2.6.14-mm2-cachefs/include/linux/list.h
--- linux-2.6.14-mm2/include/linux/list.h	2005-11-14 16:17:58.000000000 +0000
+++ linux-2.6.14-mm2-cachefs/include/linux/list.h	2005-11-14 16:23:38.000000000 +0000
@@ -450,6 +450,20 @@ static inline void list_splice_init(stru
 	     pos = n, n = list_entry(n->member.next, typeof(*n), member))
 
 /**
+ * list_for_each_entry_safe_reverse - iterate backwards over list of given type safe against
+ *				      removal of list entry
+ * @pos:	the type * to use as a loop counter.
+ * @n:		another type * to use as temporary storage
+ * @head:	the head for your list.
+ * @member:	the name of the list_struct within the struct.
+ */
+#define list_for_each_entry_safe_reverse(pos, n, head, member)		\
+	for (pos = list_entry((head)->prev, typeof(*pos), member),	\
+		n = list_entry(pos->member.prev, typeof(*pos), member);	\
+	     &pos->member != (head); 					\
+	     pos = n, n = list_entry(n->member.prev, typeof(*n), member))
+
+/**
  * list_for_each_rcu	-	iterate over an rcu-protected list
  * @pos:	the &struct list_head to use as a loop counter.
  * @head:	the head for your list.
-
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