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blk-mq: fix blk_mq_all_tag_iter 

blk_mq_all_tag_iter() is added to iterate all requests, so we should
fetch the request from ->static_rqs][] instead of ->rqs[] which is for
holding in-flight request only.

Fix it by adding flag of BT_TAG_ITER_STATIC_RQS.

Fixes: bf0beec060 ("blk-mq: drain I/O when all CPUs in a hctx are offline")
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Tested-by: John Garry <john.garry@huawei.com>
Cc: Dongli Zhang <dongli.zhang@oracle.com>
Cc: Hannes Reinecke <hare@suse.de>
Cc: Daniel Wagner <dwagner@suse.de>
Cc: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Ming Lei 2020-06-05 19:44:10 +08:00 committed by Jens Axboe
parent d94ecfc399
commit 22f614bc0f
1 changed files with 9 additions and 3 deletions
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12
block/blk-mq-tag.c
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@ -296,6 +296,7 @@ struct bt_tags_iter_data {
#define BT_TAG_ITER_RESERVED (1 << 0)
#define BT_TAG_ITER_STARTED (1 << 1)
#define BT_TAG_ITER_STATIC_RQS (1 << 2)
static bool bt_tags_iter(struct sbitmap *bitmap, unsigned int bitnr, void *data)
{
@ -309,9 +310,12 @@ static bool bt_tags_iter(struct sbitmap *bitmap, unsigned int bitnr, void *data)
/*
* We can hit rq == NULL here, because the tagging functions
* test and set the bit before assining ->rqs[].
* test and set the bit before assigning ->rqs[].
*/
rq = tags->rqs[bitnr];
if (iter_data->flags & BT_TAG_ITER_STATIC_RQS)
rq = tags->static_rqs[bitnr];
else
rq = tags->rqs[bitnr];
if (!rq)
return true;
if ((iter_data->flags & BT_TAG_ITER_STARTED) &&
@ -366,11 +370,13 @@ static void __blk_mq_all_tag_iter(struct blk_mq_tags *tags,
* indicates whether or not @rq is a reserved request. Return
* true to continue iterating tags, false to stop.
* @priv: Will be passed as second argument to @fn.
*
* Caller has to pass the tag map from which requests are allocated.
*/
void blk_mq_all_tag_iter(struct blk_mq_tags *tags, busy_tag_iter_fn *fn,
void *priv)
{
return __blk_mq_all_tag_iter(tags, fn, priv, 0);
return __blk_mq_all_tag_iter(tags, fn, priv, BT_TAG_ITER_STATIC_RQS);
}
/**