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| author | Ming Lei <ming.lei@redhat.com> | 2020-06-05 19:44:10 +0800 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2020-06-07 08:56:50 -0600 |
| commit | 22f614bc0f376e7a1bcf1a2cd912885f4a933045 (patch) | |
| tree | a1392f6f487a5d46cfb1939975f615fda561e7be /block | |
| parent | d94ecfc399715f06da347922e7979c088b1d8834 (diff) | |
| download | linux-22f614bc0f376e7a1bcf1a2cd912885f4a933045.tar.bz2 | |
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: bf0beec0607d ("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>
Diffstat (limited to 'block')
| -rw-r--r-- | block/blk-mq-tag.c | 12 |
1 files changed, 9 insertions, 3 deletions
diff --git a/block/blk-mq-tag.c b/block/blk-mq-tag.c index cded7fdcad8e..44f3d0967cb4 100644 --- a/block/blk-mq-tag.c +++ b/block/blk-mq-tag.c @@ -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); } /** |