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From: Hannes Reinecke <hare@suse.de>
To: "Martin K. Petersen" <martin.petersen@oracle.com>
Cc: Christoph Hellwig <hch@lst.de>,
	James Bottomley <james.bottomley@hansenpartnership.com>,
	linux-scsi@vger.kernel.org, Hannes Reinecke <hare@suse.de>
Subject: [PATCH 10/13] scsi: add scsi_host_busy_iter()
Date: Thu, 13 Feb 2020 15:04:19 +0100	[thread overview]
Message-ID: <20200213140422.128382-11-hare@suse.de> (raw)
In-Reply-To: <20200213140422.128382-1-hare@suse.de>

Add an iterator scsi_host_busy_iter() to traverse all busy commands.
If locking against concurrent command completions is required it
has to be provided by the caller.

Signed-off-by: Hannes Reinecke <hare@suse.de>
---
 drivers/scsi/hosts.c     | 33 +++++++++++++++++++++++++++++++++
 include/scsi/scsi_host.h |  5 +++++
 2 files changed, 38 insertions(+)

diff --git a/drivers/scsi/hosts.c b/drivers/scsi/hosts.c
index 00ae9d43ce9f..91987b9fb45f 100644
--- a/drivers/scsi/hosts.c
+++ b/drivers/scsi/hosts.c
@@ -678,3 +678,36 @@ void scsi_host_complete_all_commands(struct Scsi_Host *shost, int status)
 				&status);
 }
 EXPORT_SYMBOL_GPL(scsi_host_complete_all_commands);
+
+struct scsi_host_busy_iter_data {
+	scsi_host_busy_iter_fn *fn;
+	void *priv;
+};
+
+static bool __scsi_host_busy_iter_fn(struct request *req, void *priv,
+				   bool reserved)
+{
+	struct scsi_host_busy_iter_data *iter_data = priv;
+	struct scsi_cmnd *sc = blk_mq_rq_to_pdu(req);
+
+	return iter_data->fn(sc, iter_data->priv, reserved);
+}
+
+/**
+ * scsi_host_busy_iter - Iterate over all busy commands
+ * @shost:	Pointer to Scsi_Host.
+ * @fn:		Function to call on each busy command
+ * @priv:	Data pointer passed to @fn
+ **/
+void scsi_host_busy_iter(struct Scsi_Host *shost,
+			 scsi_host_busy_iter_fn *fn, void *priv)
+{
+	struct scsi_host_busy_iter_data iter_data = {
+		.fn = fn,
+		.priv = priv,
+	};
+
+	blk_mq_tagset_busy_iter(&shost->tag_set, __scsi_host_busy_iter_fn,
+				&iter_data);
+}
+EXPORT_SYMBOL_GPL(scsi_host_busy_iter);
diff --git a/include/scsi/scsi_host.h b/include/scsi/scsi_host.h
index a230e2c0e11f..f5300ad887c4 100644
--- a/include/scsi/scsi_host.h
+++ b/include/scsi/scsi_host.h
@@ -760,6 +760,11 @@ extern void scsi_block_requests(struct Scsi_Host *);
 extern int scsi_host_block(struct Scsi_Host *shost);
 extern int scsi_host_unblock(struct Scsi_Host *shost, int new_state);
 
+typedef bool (scsi_host_busy_iter_fn)(struct scsi_cmnd *, void *, bool);
+
+void scsi_host_busy_iter(struct Scsi_Host *,
+			 scsi_host_busy_iter_fn *fn, void *priv);
+
 struct class_container;
 
 /*
-- 
2.16.4


  parent reply	other threads:[~2020-02-13 14:05 UTC|newest]

Thread overview: 30+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-02-13 14:04 [PATCHv7 00/13] scsi: remove legacy cmd_list implementation Hannes Reinecke
2020-02-13 14:04 ` [PATCH 01/13] dpt_i2o: rename adpt_i2o_to_scsi() to adpt_i2o_scsi_complete() Hannes Reinecke
2020-02-13 14:04 ` [PATCH 02/13] scsi: add scsi_host_complete_all_commands() helper Hannes Reinecke
2020-02-26 17:39   ` Christoph Hellwig
2020-02-26 22:26     ` Hannes Reinecke
2020-02-26 22:58     ` Hannes Reinecke
2020-02-13 14:04 ` [PATCH 03/13] dpt_i2o: use scsi_host_complete_all_commands() to abort outstanding commands Hannes Reinecke
2020-02-13 14:04 ` [PATCH 04/13] aacraid: Do not wait for outstanding write commands on synchronize_cache Hannes Reinecke
2020-02-26 17:40   ` Christoph Hellwig
2020-02-13 14:04 ` [PATCH 05/13] aacraid: use scsi_host_complete_all_commands() to terminate outstanding commands Hannes Reinecke
2020-02-13 14:04 ` [PATCH 06/13] aacraid: replace aac_flush_ios() with midlayer helper Hannes Reinecke
2020-02-26 17:40   ` Christoph Hellwig
2020-02-13 14:04 ` [PATCH 07/13] aacraid: move scsi_(block,unblock)_requests out of _aac_reset_adapter() Hannes Reinecke
2020-02-26 17:42   ` Christoph Hellwig
2020-02-13 14:04 ` [PATCH 08/13] scsi: add scsi_host_(block,unblock) helper function Hannes Reinecke
2020-02-20  4:53   ` Bart Van Assche
2020-02-26 17:42   ` Christoph Hellwig
2020-02-13 14:04 ` [PATCH 09/13] aacraid: use scsi_host_(block,unblock) to block I/O Hannes Reinecke
2020-02-26 17:43   ` Christoph Hellwig
2020-02-13 14:04 ` Hannes Reinecke [this message]
2020-02-26 17:45   ` [PATCH 10/13] scsi: add scsi_host_busy_iter() Christoph Hellwig
2020-02-26 22:28     ` Hannes Reinecke
2020-02-13 14:04 ` [PATCH 11/13] aacraid: use scsi_host_busy_iter() to wait for outstanding commands Hannes Reinecke
2020-02-26 17:46   ` Christoph Hellwig
2020-02-13 14:04 ` [PATCH 12/13] aacraid: use scsi_host_busy_iter() in get_num_of_incomplete_fibs() Hannes Reinecke
2020-02-26 17:46   ` Christoph Hellwig
2020-02-13 14:04 ` [PATCH 13/13] scsi: Remove cmd_list functionality Hannes Reinecke
2020-02-26 17:47   ` Christoph Hellwig
  -- strict thread matches above, loose matches on Subject: below --
2020-02-28  7:53 [PATCHv8 00/13] scsi: remove legacy cmd_list implementation Hannes Reinecke
2020-02-28  7:53 ` [PATCH 10/13] scsi: add scsi_host_busy_iter() Hannes Reinecke
2019-12-04 14:59 [PATCHv6 00/13] scsi: remove legacy cmd_list implementation Hannes Reinecke
2019-12-04 14:59 ` [PATCH 10/13] scsi: add scsi_host_busy_iter() Hannes Reinecke

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