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authorYufen Yu <yuyufen@huawei.com>2019-03-18 17:44:41 +0300
committerJens Axboe <axboe@kernel.dk>2019-03-20 23:02:07 +0300
commit29ece8b4354f8c5eaee798a3d8a1b356efee426f (patch)
tree953360a0c9964a71527205e3f427269c80d0f10f /include
parent9496c015ed39ddfce971d63a1442e6d258504a7d (diff)
downloadlinux-29ece8b4354f8c5eaee798a3d8a1b356efee426f.tar.xz
block: add BLK_MQ_POLL_CLASSIC for hybrid poll and return EINVAL for unexpected value
For q->poll_nsec == -1, means doing classic poll, not hybrid poll. We introduce a new flag BLK_MQ_POLL_CLASSIC to replace -1, which may make code much easier to read. Additionally, since val is an int obtained with kstrtoint(), val can be a negative value other than -1, so return -EINVAL for that case. Thanks to Damien Le Moal for some good suggestion. Reviewed-by: Damien Le Moal <damien.lemoal@wdc.com> Signed-off-by: Yufen Yu <yuyufen@huawei.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'include')
-rw-r--r--include/linux/blkdev.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 0de92b29f589..5c58a3b2bf00 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -50,6 +50,9 @@ struct blk_stat_callback;
/* Must be consistent with blk_mq_poll_stats_bkt() */
#define BLK_MQ_POLL_STATS_BKTS 16
+/* Doing classic polling */
+#define BLK_MQ_POLL_CLASSIC -1
+
/*
* Maximum number of blkcg policies allowed to be registered concurrently.
* Defined here to simplify include dependency.