[PATCH 14/16] block: don't allow writing to the poll queue attribute
From: Christoph Hellwig <hch@lst.de>
Date: 2021-06-15 13:15:13
Also in:
linux-fsdevel, linux-nvme
Subsystem:
block layer, the rest · Maintainers:
Jens Axboe, Linus Torvalds
The poll attribute is a historic artefact from before when we had explicit poll queues that require driver specific configuration. Just print a warning when writing to the attribute. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Sagi Grimberg <sagi@grimberg.me> Tested-by: Mark Wunderlich <redacted> --- block/blk-sysfs.c | 23 ++++------------------- 1 file changed, 4 insertions(+), 19 deletions(-)
diff --git a/block/blk-sysfs.c b/block/blk-sysfs.c
index f89e2fc3963b..f78e73ca6091 100644
--- a/block/blk-sysfs.c
+++ b/block/blk-sysfs.c@@ -428,26 +428,11 @@ static ssize_t queue_poll_show(struct request_queue *q, char *page) static ssize_t queue_poll_store(struct request_queue *q, const char *page, size_t count) { - unsigned long poll_on; - ssize_t ret; - - if (!q->tag_set || q->tag_set->nr_maps <= HCTX_TYPE_POLL || - !q->tag_set->map[HCTX_TYPE_POLL].nr_queues) + if (!test_bit(QUEUE_FLAG_POLL, &q->queue_flags)) return -EINVAL; - - ret = queue_var_store(&poll_on, page, count); - if (ret < 0) - return ret; - - if (poll_on) { - blk_queue_flag_set(QUEUE_FLAG_POLL, q); - } else { - blk_mq_freeze_queue(q); - blk_queue_flag_clear(QUEUE_FLAG_POLL, q); - blk_mq_unfreeze_queue(q); - } - - return ret; + pr_info_ratelimited("writes to the poll attribute are ignored.\n"); + pr_info_ratelimited("please use driver specific parameters instead.\n"); + return count; } static ssize_t queue_io_timeout_show(struct request_queue *q, char *page)
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2.30.2