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Wed, 3 Feb 2021 10:54:40 -0500 (EST) Received: from prgdevlinuxpatch01.amust.local (172.24.14.5) by prgmbx01.amust.local (172.24.0.171) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.721.2; Wed, 3 Feb 2021 16:54:22 +0100 From: Sergei Shtepa To: , , , , , , , , , , , , , , , Date: Wed, 3 Feb 2021 18:53:55 +0300 Message-ID: <1612367638-3794-4-git-send-email-sergei.shtepa@veeam.com> In-Reply-To: <1612367638-3794-1-git-send-email-sergei.shtepa@veeam.com> References: <1612367638-3794-1-git-send-email-sergei.shtepa@veeam.com> MIME-Version: 1.0 X-Originating-IP: [172.24.14.5] X-ClientProxiedBy: prgmbx02.amust.local (172.24.0.172) To prgmbx01.amust.local (172.24.0.171) X-EsetResult: clean, is OK X-EsetId: 37303A29C604D265667062 X-Veeam-MMEX: True X-Mimecast-Impersonation-Protect: Policy=CLT - Impersonation Protection Definition; Similar Internal Domain=false; Similar Monitored External Domain=false; Custom External Domain=false; Mimecast External Domain=false; Newly Observed Domain=false; Internal User Name=false; Custom Display Name List=false; Reply-to Address Mismatch=false; Targeted Threat Dictionary=false; Mimecast Threat Dictionary=false; Custom Threat Dictionary=false X-Scanned-By: MIMEDefang 2.78 on 10.11.54.3 X-loop: dm-devel@redhat.com Cc: pavgel.tide@veeam.com, sergei.shtepa@veeam.com Subject: [dm-devel] [PATCH v4 3/6] block: add blk_mq_is_queue_frozen() X-BeenThere: dm-devel@redhat.com X-Mailman-Version: 2.1.12 Precedence: junk List-Id: device-mapper development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: dm-devel-bounces@redhat.com Errors-To: dm-devel-bounces@redhat.com X-Scanned-By: MIMEDefang 2.79 on 10.5.11.15 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=dm-devel-bounces@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com blk_mq_is_queue_frozen() allow to assert that the queue is frozen. Signed-off-by: Sergei Shtepa --- block/blk-mq.c | 13 +++++++++++++ include/linux/blk-mq.h | 1 + 2 files changed, 14 insertions(+) diff --git a/block/blk-mq.c b/block/blk-mq.c index f285a9123a8b..924ec26fae5f 100644 --- a/block/blk-mq.c +++ b/block/blk-mq.c @@ -161,6 +161,19 @@ int blk_mq_freeze_queue_wait_timeout(struct request_queue *q, } EXPORT_SYMBOL_GPL(blk_mq_freeze_queue_wait_timeout); + +bool blk_mq_is_queue_frozen(struct request_queue *q) +{ + bool ret; + + mutex_lock(&q->mq_freeze_lock); + ret = percpu_ref_is_dying(&q->q_usage_counter) && percpu_ref_is_zero(&q->q_usage_counter); + mutex_unlock(&q->mq_freeze_lock); + + return ret; +} +EXPORT_SYMBOL_GPL(blk_mq_is_queue_frozen); + /* * Guarantee no request is in use, so we can change any data structure of * the queue afterward. diff --git a/include/linux/blk-mq.h b/include/linux/blk-mq.h index d705b174d346..9d1e8c4e922e 100644 --- a/include/linux/blk-mq.h +++ b/include/linux/blk-mq.h @@ -525,6 +525,7 @@ void blk_freeze_queue_start(struct request_queue *q); void blk_mq_freeze_queue_wait(struct request_queue *q); int blk_mq_freeze_queue_wait_timeout(struct request_queue *q, unsigned long timeout); +bool blk_mq_is_queue_frozen(struct request_queue *q); int blk_mq_map_queues(struct blk_mq_queue_map *qmap); void blk_mq_update_nr_hw_queues(struct blk_mq_tag_set *set, int nr_hw_queues);