2 files changed, 45 insertions, 0 deletions

diff --git a/fs/seq_file.c b/fs/seq_file.c
index 0ac22af7afe5..49194a4e6b91 100644
--- a/fs/seq_file.c
+++ b/fs/seq_file.c
@@ -447,3 +447,37 @@ int seq_puts(struct seq_file *m, const char *s)
         return -1;
 }
 EXPORT_SYMBOL(seq_puts);
+
+struct list_head *seq_list_start(struct list_head *head, loff_t pos)
+{
+        struct list_head *lh;
+
+        list_for_each(lh, head)
+                if (pos-- == 0)
+                        return lh;
+
+        return NULL;
+}
+
+EXPORT_SYMBOL(seq_list_start);
+
+struct list_head *seq_list_start_head(struct list_head *head, loff_t pos)
+{
+        if (!pos)
+                return head;
+
+        return seq_list_start(head, pos - 1);
+}
+
+EXPORT_SYMBOL(seq_list_start_head);
+
+struct list_head *seq_list_next(void *v, struct list_head *head, loff_t *ppos)
+{
+        struct list_head *lh;
+
+        lh = ((struct list_head *)v)->next;
+        ++*ppos;
+        return lh == head ? NULL : lh;
+}
+
+EXPORT_SYMBOL(seq_list_next);
diff --git a/include/linux/seq_file.h b/include/linux/seq_file.h
index 3e3cccbb1cac..83783ab0f552 100644
--- a/include/linux/seq_file.h
+++ b/include/linux/seq_file.h
@@ -50,5 +50,16 @@ int seq_release_private(struct inode *, struct file *);
 
 #define SEQ_START_TOKEN ((void *)1)
 
+/*
+ * Helpers for iteration over list_head-s in seq_files
+ */
+
+extern struct list_head *seq_list_start(struct list_head *head,
+                loff_t pos);
+extern struct list_head *seq_list_start_head(struct list_head *head,
+                loff_t pos);
+extern struct list_head *seq_list_next(void *v, struct list_head *head,
+                loff_t *ppos);
+
 #endif
 #endif