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SubjectRe: [PATCH 00/13] net: simplify seq_file code
[PATCH 01/13] seq_file: Add helpers for iteration over a hlist

Some places in kernel need to iterate over a hlist in seq_file,
so provide some common helpers.

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
---
fs/seq_file.c | 37 ++++++++++++++++++++++++++++++++++---
include/linux/seq_file.h | 11 +++++++++++
2 files changed, 45 insertions(+), 3 deletions(-)

diff --git a/fs/seq_file.c b/fs/seq_file.c
index eae7d9d..e833076 100644
--- a/fs/seq_file.c
+++ b/fs/seq_file.c
@@ -674,7 +674,6 @@ struct list_head *seq_list_start(struct list_head *head, loff_t pos)

return NULL;
}
-
EXPORT_SYMBOL(seq_list_start);

struct list_head *seq_list_start_head(struct list_head *head, loff_t pos)
@@ -684,7 +683,6 @@ struct list_head *seq_list_start_head(struct list_head *head, loff_t pos)

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)
@@ -695,5 +693,38 @@ struct list_head *seq_list_next(void *v, struct list_head *head, loff_t *ppos)
++*ppos;
return lh == head ? NULL : lh;
}
-
EXPORT_SYMBOL(seq_list_next);
+
+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;
+}
+EXPORT_SYMBOL(seq_hlist_start);
+
+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);
+
+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/seq_file.h b/include/linux/seq_file.h
index 8366d8f..c95bcdc 100644
--- a/include/linux/seq_file.h
+++ b/include/linux/seq_file.h
@@ -135,4 +135,15 @@ extern struct list_head *seq_list_start_head(struct list_head *head,
extern struct list_head *seq_list_next(void *v, struct list_head *head,
loff_t *ppos);

+/*
+ * Helpers for iteration over hlist_head-s in seq_files
+ */
+
+extern struct hlist_node *seq_hlist_start(struct hlist_head *head,
+ loff_t pos);
+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);
+
#endif
--
1.6.3


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