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block: export blk_validate_limits

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While block drivers do the validation as part of committing them to the
queue, users that use the limit outside of a block device context have
to validate the limits and fill in the calculated values as well.

So far btrfs is the only user of queue limits without a block device,
and it has gotten away with that more or less by accident.  But with
commit 559218d43e ("block: pre-calculate max_zone_append_sectors")
this became fatal for setups that have small max zone append size,
as it won't be limited now.

Export blk_validate_limits so that it can be called directly from btrfs.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Link: https://lore.kernel.org/r/20241113084541.34315-2-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig
2024-11-13 09:45:35 +01:00
committed by Jens Axboe
parent 15da3dd3f5
commit 470d2bc3a0
2 changed files with 3 additions and 1 deletions
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include/linux/blkdev.h
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@@ -948,6 +948,7 @@ queue_limits_start_update(struct request_queue *q)
int queue_limits_commit_update(struct request_queue *q,
struct queue_limits *lim);
int queue_limits_set(struct request_queue *q, struct queue_limits *lim);
int blk_validate_limits(struct queue_limits *lim);
/**
* queue_limits_cancel_update - cancel an atomic update of queue limits