seq_file: Add helpers for iteration over a hlist (66655de6) · Commits · 戴 / test

fs/seq_file.c

+56 −3

Original line number	Diff line number	Diff line
		@@ -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 +693,60 @@ 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);

include/linux/seq_file.h

+11 −0

Original line number	Diff line number	Diff line
		@@ -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

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