From: Li Zefan <lizf@cn•fujitsu.com>
To: David Miller <davem@davemloft•net>
Cc: Andrew Morton <akpm@linux-foundation•org>,
LKML <linux-kernel@vger•kernel.org>,
"netdev@vger•kernel.org" <netdev@vger•kernel.org>
Subject: [PATCH 01/13] seq_file: Add helpers for iteration over a hlist
Date: Tue, 09 Feb 2010 17:18:22 +0800 [thread overview]
Message-ID: <4B71285E.9060006@cn.fujitsu.com> (raw)
In-Reply-To: <4B712849.9040400@cn.fujitsu.com>
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 | 60 +++++++++++++++++++++++++++++++++++++++++++--
include/linux/seq_file.h | 11 ++++++++
2 files changed, 68 insertions(+), 3 deletions(-)
diff --git a/fs/seq_file.c b/fs/seq_file.c
index eae7d9d..ff91aef 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 +693,61 @@ 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);
+
+/**
+ * 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;
+}
+EXPORT_SYMBOL(seq_hlist_start);
+
+/**
+ * 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
+ * @pos: the current posision
+ *
+ * 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/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
next prev parent reply other threads:[~2010-02-09 9:18 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-02-09 9:18 [PATCH 00/13] net: simplify seq_file code, revised Li Zefan
2010-02-09 9:18 ` Li Zefan [this message]
2010-02-09 9:18 ` [PATCH 02/13] net: add a wrapper sk_entry() Li Zefan
2010-02-09 9:19 ` [PATCH 03/13] net: x25: use seq_hlist_foo() helpers Li Zefan
2010-02-09 9:19 ` [PATCH 04/13] net: rose: " Li Zefan
2010-02-09 9:19 ` [PATCH 05/13] net: packet: " Li Zefan
2010-02-09 9:19 ` [PATCH 06/13] net: netrom: " Li Zefan
2010-02-09 9:19 ` [PATCH 07/13] net: ax25: " Li Zefan
2010-02-09 9:20 ` [PATCH 08/13] net: appletalk: " Li Zefan
2010-02-09 9:20 ` [PATCH 09/13] net: af_key: " Li Zefan
2010-02-09 9:20 ` [PATCH 10/13] net: x25: use seq_list_foo() helpers Li Zefan
2010-02-09 9:21 ` [PATCH 11/13] net: irda: " Li Zefan
2010-02-09 9:21 ` [PATCH 12/13] net: ipx: " Li Zefan
2010-02-09 9:21 ` [PATCH 13/13] net: atm: " Li Zefan
2010-02-10 19:31 ` [PATCH 00/13] net: simplify seq_file code, revised David Miller
2010-02-10 20:29 ` David Miller
-- strict thread matches above, loose matches on Subject: below --
2010-02-05 1:44 [PATCH 00/13] net: simplify seq_file code Li Zefan
2010-02-05 1:58 ` Andrew Morton
2010-02-05 2:12 ` Li Zefan
2010-02-05 4:32 ` David Miller
2010-02-05 5:04 ` [PATCH 01/13] seq_file: Add helpers for iteration over a hlist Li Zefan
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