blk-iocost: prevent configuration update concurrent with io throttling

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This won't cause any severe problem currently, however, this doesn't
seems appropriate:

1) 'ioc->params' is read from multiple places without holding
'ioc->lock', unexpected value might be read if writing it concurrently.

2) If configuration is changed while io is throttling, the functionality
might be affected. For example, if module params is updated and cost
becomes smaller, waiting for timer that is caculated under old
configuration is not appropriate.

Signed-off-by: Yu Kuai <yukuai3@huawei.com>
Acked-by: Tejun Heo <tj@kernel.org>
Link: https://lore.kernel.org/r/20221012094035.390056-4-yukuai1@huaweicloud.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>

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Yu Kuai 2022-10-12 17:40:34 +08:00 • committed by Jens Axboe

parent 2c06479884

commit 2b2da2f6dc

1 changed files with 24 additions and 2 deletions

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block/blk-iocost.c

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