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block: move the poll flag to queue_limits

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Move the poll flag into the queue_limits feature field so that it can
be set atomically with the queue frozen.

Stacking drivers are simplified in that they now can simply set the
flag, and blk_stack_limits will clear it when the features is not
supported by any of the underlying devices.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Damien Le Moal <dlemoal@kernel.org>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Link: https://lore.kernel.org/r/20240617060532.127975-22-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig
2024-06-17 08:04:48 +02:00
committed by Jens Axboe
parent f467fee48d
commit 8023e144f9
8 changed files with 45 additions and 76 deletions
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12
drivers/nvme/host/multipath.c
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@@ -538,7 +538,7 @@ int nvme_mpath_alloc_disk(struct nvme_ctrl *ctrl, struct nvme_ns_head *head)
blk_set_stacking_limits(&lim);
lim.dma_alignment = 3;
lim.features |= BLK_FEAT_IO_STAT | BLK_FEAT_NOWAIT;
lim.features |= BLK_FEAT_IO_STAT | BLK_FEAT_NOWAIT | BLK_FEAT_POLL;
if (head->ids.csi != NVME_CSI_ZNS)
lim.max_zone_append_sectors = 0;
@@ -549,16 +549,6 @@ int nvme_mpath_alloc_disk(struct nvme_ctrl *ctrl, struct nvme_ns_head *head)
head->disk->private_data = head;
sprintf(head->disk->disk_name, "nvme%dn%d",
ctrl->subsys->instance, head->instance);
/*
* This assumes all controllers that refer to a namespace either
* support poll queues or not. That is not a strict guarantee,
* but if the assumption is wrong the effect is only suboptimal
* performance but not correctness problem.
*/
if (ctrl->tagset->nr_maps > HCTX_TYPE_POLL &&
ctrl->tagset->map[HCTX_TYPE_POLL].nr_queues)
blk_queue_flag_set(QUEUE_FLAG_POLL, head->disk->queue);
return 0;
}