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blk-mq: manage hctx map via xarray

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First code becomes more clean by switching to xarray from plain array.

Second use-after-free on q->queue_hw_ctx can be fixed because
queue_for_each_hw_ctx() may be run when updating nr_hw_queues is
in-progress. With this patch, q->hctx_table is defined as xarray, and
this structure will share same lifetime with request queue, so
queue_for_each_hw_ctx() can use q->hctx_table to lookup hctx reliably.

Reported-by: Yu Kuai <yukuai3@huawei.com>
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20220308073219.91173-7-ming.lei@redhat.com
[axboe: fix blk_mq_hw_ctx forward declaration]
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Ming Lei
2022-03-08 15:32:19 +08:00
committed by Jens Axboe
parent 4f48120874
commit 4e5cc99e1e
6 changed files with 30 additions and 43 deletions
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2
include/linux/blkdev.h
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@@ -355,7 +355,7 @@ struct request_queue {
unsigned int queue_depth;
/* hw dispatch queues */
struct blk_mq_hw_ctx **queue_hw_ctx;
struct xarray hctx_table;
unsigned int nr_hw_queues;
/*