summaryrefslogtreecommitdiff
diff options
context:
space:
mode:
authorKeith Busch <kbusch@kernel.org>2022-01-05 09:05:17 -0800
committerJens Axboe <axboe@kernel.dk>2022-01-05 12:25:42 -0700
commitd2528be7a8b09af9796a270debd14101a72bb552 (patch)
treed0066044c0ae1009dde56ba1684ff7b30a723ece
parent3764fd05e1f89530e2ee5cbff0b638f2b1141b90 (diff)
block: introduce rq_list_move
When iterating a list, a particular request may need to be moved for special handling. Provide a helper function to achieve that so drivers don't need to reimplement rqlist manipulation. Signed-off-by: Keith Busch <kbusch@kernel.org> Reviewed-by: Christoph Hellwig <hch@lst.de> Link: https://lore.kernel.org/r/20220105170518.3181469-4-kbusch@kernel.org Signed-off-by: Jens Axboe <axboe@kernel.dk>
-rw-r--r--include/linux/blk-mq.h17
1 files changed, 17 insertions, 0 deletions
diff --git a/include/linux/blk-mq.h b/include/linux/blk-mq.h
index 1467f0fa2142..f40a05ecca4a 100644
--- a/include/linux/blk-mq.h
+++ b/include/linux/blk-mq.h
@@ -249,6 +249,23 @@ static inline unsigned short req_get_ioprio(struct request *req)
#define rq_list_next(rq) (rq)->rq_next
#define rq_list_empty(list) ((list) == (struct request *) NULL)
+/**
+ * rq_list_move() - move a struct request from one list to another
+ * @src: The source list @rq is currently in
+ * @dst: The destination list that @rq will be appended to
+ * @rq: The request to move
+ * @prev: The request preceding @rq in @src (NULL if @rq is the head)
+ */
+static void inline rq_list_move(struct request **src, struct request **dst,
+ struct request *rq, struct request *prev)
+{
+ if (prev)
+ prev->rq_next = rq->rq_next;
+ else
+ *src = rq->rq_next;
+ rq_list_add(dst, rq);
+}
+
enum blk_eh_timer_return {
BLK_EH_DONE, /* drivers has completed the command */
BLK_EH_RESET_TIMER, /* reset timer and try again */