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| author | Christoph Hellwig <hch@lst.de> | 2021-10-12 13:12:25 +0200 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2021-10-18 06:17:36 -0600 |
| commit | a614dd2280356df0c79300c49d82b7e0c8b31f24 (patch) | |
| tree | bffe181a9418f7eaa560cfea5698ee37080bd805 /block/blk-sysfs.c | |
| parent | 3e08773c3841e9db7a520908cc2b136a77d275ff (diff) | |
| download | lwn-a614dd2280356df0c79300c49d82b7e0c8b31f24.tar.gz lwn-a614dd2280356df0c79300c49d82b7e0c8b31f24.zip | |
block: don't allow writing to the poll queue attribute
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 <mark.wunderlich@intel.com>
Link: https://lore.kernel.org/r/20211012111226.760968-16-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block/blk-sysfs.c')
| -rw-r--r-- | block/blk-sysfs.c | 23 |
1 files changed, 4 insertions, 19 deletions
diff --git a/block/blk-sysfs.c b/block/blk-sysfs.c index da883efcba33..36f14d658e81 100644 --- a/block/blk-sysfs.c +++ b/block/blk-sysfs.c @@ -433,26 +433,11 @@ 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) |