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io-wq: add helper to merge two wq_lists
add a helper to merge two wq_lists, it will be useful in the next patches. Reviewed-by: Pavel Begunkov <asml.silence@gmail.com> Signed-off-by: Hao Xu <haoxu@linux.alibaba.com> Link: https://lore.kernel.org/r/20211207093951.247840-2-haoxu@linux.alibaba.com Signed-off-by: Jens Axboe <axboe@kernel.dk>
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fs/io-wq.h
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fs/io-wq.h
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@ -52,6 +52,28 @@ static inline void wq_list_add_after(struct io_wq_work_node *node,
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list->last = node;
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list->last = node;
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}
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}
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/**
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* wq_list_merge - merge the second list to the first one.
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* @list0: the first list
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* @list1: the second list
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* Return the first node after mergence.
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*/
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static inline struct io_wq_work_node *wq_list_merge(struct io_wq_work_list *list0,
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struct io_wq_work_list *list1)
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{
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struct io_wq_work_node *ret;
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if (!list0->first) {
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ret = list1->first;
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} else {
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ret = list0->first;
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list0->last->next = list1->first;
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}
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INIT_WQ_LIST(list0);
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INIT_WQ_LIST(list1);
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return ret;
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}
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static inline void wq_list_add_tail(struct io_wq_work_node *node,
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static inline void wq_list_add_tail(struct io_wq_work_node *node,
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struct io_wq_work_list *list)
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struct io_wq_work_list *list)
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{
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{
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