compat: add seq_hlist_next and seq_hlist_start_head

These functions are copied from the kernel and are needed by
net/bluetooth/af_bluetooth.c

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
Signed-off-by: Luis R. Rodriguez <mcgrof@frijolero.org>

diff --git a/compat/compat-2.6.34.c b/compat/compat-2.6.34.c
index b905a26cba0118fe05d6ea0f56ab217170548297..80a61079adf7f91eab6402a9064ccc6e57309e37 100644 (file)
--- a/compat/compat-2.6.34.c
+++ b/compat/compat-2.6.34.c
@@ -28,3 +28,58 @@ int sdio_set_host_pm_flags(struct sdio_func *func, mmc_pm_flag_t flags)
 {
        return -EINVAL;
 }
+
+/**
+ * seq_hlist_start - start an iteration of a hlist
+ * @head: the head of the hlist
+ * @pos:  the start position of the sequence
+ *
+ * Called at seq_file->op->start().
+ */
+struct hlist_node *seq_hlist_start(struct hlist_head *head, loff_t pos)
+{
+       struct hlist_node *node;
+
+       hlist_for_each(node, head)
+               if (pos-- == 0)
+                       return node;
+       return NULL;
+}
+
+/**
+ * seq_hlist_start_head - start an iteration of a hlist
+ * @head: the head of the hlist
+ * @pos:  the start position of the sequence
+ *
+ * Called at seq_file->op->start(). Call this function if you want to
+ * print a header at the top of the output.
+ */
+struct hlist_node *seq_hlist_start_head(struct hlist_head *head, loff_t pos)
+{
+       if (!pos)
+               return SEQ_START_TOKEN;
+
+       return seq_hlist_start(head, pos - 1);
+}
+EXPORT_SYMBOL(seq_hlist_start_head);
+
+/**
+ * seq_hlist_next - move to the next position of the hlist
+ * @v:    the current iterator
+ * @head: the head of the hlist
+ * @ppos: the current position
+ *
+ * Called at seq_file->op->next().
+ */
+struct hlist_node *seq_hlist_next(void *v, struct hlist_head *head,
+                                 loff_t *ppos)
+{
+       struct hlist_node *node = v;
+
+       ++*ppos;
+       if (v == SEQ_START_TOKEN)
+               return head->first;
+       else
+               return node->next;
+}
+EXPORT_SYMBOL(seq_hlist_next);

diff --git a/include/linux/compat-2.6.34.h b/include/linux/compat-2.6.34.h
index b5a40e2a6102d3f8d4f4b463fc26b37c9d70e855..39bc13b0109935e3fed4f7df8cf98de54a79d497 100644 (file)
--- a/include/linux/compat-2.6.34.h
+++ b/include/linux/compat-2.6.34.h
@@ -319,6 +319,12 @@ static inline int lockdep_rtnl_is_held(void)
 }
 #endif /* #ifdef CONFIG_PROVE_LOCKING */
 
+extern struct hlist_node *seq_hlist_start_head(struct hlist_head *head,
+                                              loff_t pos);
+
+extern struct hlist_node *seq_hlist_next(void *v, struct hlist_head *head,
+                                        loff_t *ppos);
+
 #else /* Kernels >= 2.6.34 */
 
 static inline void init_compat_mmc_pm_flags(void)