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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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10
block/blk-settings.c
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@@ -460,13 +460,15 @@ int blk_stack_limits(struct queue_limits *t, struct queue_limits *b,
t->features |= (b->features & BLK_FEAT_INHERIT_MASK);
/*
* BLK_FEAT_NOWAIT needs to be supported both by the stacking driver
* and all underlying devices. The stacking driver sets the flag
* before stacking the limits, and this will clear the flag if any
* of the underlying devices does not support it.
* BLK_FEAT_NOWAIT and BLK_FEAT_POLL need to be supported both by the
* stacking driver and all underlying devices. The stacking driver sets
* the flags before stacking the limits, and this will clear the flags
* if any of the underlying devices does not support it.
*/
if (!(b->features & BLK_FEAT_NOWAIT))
t->features &= ~BLK_FEAT_NOWAIT;
if (!(b->features & BLK_FEAT_POLL))
t->features &= ~BLK_FEAT_POLL;
t->max_sectors = min_not_zero(t->max_sectors, b->max_sectors);
t->max_user_sectors = min_not_zero(t->max_user_sectors,