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Date: Tue, 09 Feb 2010 17:18:22 +0800 From: Li Zefan <lizf@...fujitsu.com> To: David Miller <davem@...emloft.net> CC: Andrew Morton <akpm@...ux-foundation.org>, LKML <linux-kernel@...r.kernel.org>, "netdev@...r.kernel.org" <netdev@...r.kernel.org> Subject: [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@...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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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