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>,
Hannes Reinecke <hare@suse.com>
Subject: [PATCH 09/11] scsi: add scsi_host_busy_iter()
Date: Wed, 20 Nov 2019 11:31:12 +0100 [thread overview]
Message-ID: <20191120103114.24723-10-hare@suse.de> (raw)
In-Reply-To: <20191120103114.24723-1-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.com>
---
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 c26fa1fe6103..23e8c8a38d1f 100644
--- a/drivers/scsi/hosts.c
+++ b/drivers/scsi/hosts.c
@@ -679,3 +679,36 @@ void scsi_host_flush_commands(struct Scsi_Host *shost, int status)
blk_mq_tagset_busy_iter(&shost->tag_set, flush_cmds_iter, &status);
}
EXPORT_SYMBOL_GPL(scsi_host_flush_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 cb9a6fe9ad5b..1293d9686115 100644
--- a/include/scsi/scsi_host.h
+++ b/include/scsi/scsi_host.h
@@ -761,6 +761,11 @@ static inline int scsi_host_scan_allowed(struct Scsi_Host *shost)
extern void scsi_unblock_requests(struct Scsi_Host *);
extern void scsi_block_requests(struct Scsi_Host *);
+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
next prev parent reply other threads:[~2019-11-20 10:31 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-11-20 10:31 [PATCHv5 00/11] scsi: remove legacy cmd_list implementation Hannes Reinecke
2019-11-20 10:31 ` [PATCH 01/11] dpt_i2o: rename adpt_i2o_to_scsi() to adpt_i2o_scsi_complete() Hannes Reinecke
2019-11-26 16:54 ` Christoph Hellwig
2019-11-20 10:31 ` [PATCH 02/11] scsi: add scsi_host_flush_commands() helper Hannes Reinecke
2019-11-20 16:19 ` Bart Van Assche
2019-11-21 15:46 ` Hannes Reinecke
2019-11-26 16:55 ` Christoph Hellwig
2019-11-26 18:25 ` Hannes Reinecke
2019-11-20 10:31 ` [PATCH 03/11] dpt_i2o: use scsi_host_flush_commands() to abort outstanding commands Hannes Reinecke
2019-11-26 16:55 ` Christoph Hellwig
2019-11-20 10:31 ` [PATCH 04/11] aacraid: Do not wait for outstanding write commands on synchronize_cache Hannes Reinecke
2019-11-26 17:02 ` Christoph Hellwig
2019-11-28 11:40 ` Balsundar.P
2019-11-20 10:31 ` [PATCH 05/11] aacraid: use midlayer helper to terminate outstanding commands Hannes Reinecke
2019-11-26 17:02 ` Christoph Hellwig
2019-11-28 11:41 ` Balsundar.P
2019-11-20 10:31 ` [PATCH 06/11] aacraid: replace aac_flush_ios() with midlayer helper Hannes Reinecke
2019-11-20 16:14 ` Bart Van Assche
2019-11-28 11:41 ` Balsundar.P
2019-11-20 10:31 ` [PATCH 07/11] scsi: add scsi_host_quiesce()/scsi_host_resume() helper Hannes Reinecke
2019-11-20 10:31 ` [PATCH 08/11] aacraid: use scsi_host_quiesce() to wait for I/O to complete Hannes Reinecke
2019-11-20 16:23 ` Bart Van Assche
2019-11-26 8:29 ` Balsundar.P
2019-11-28 11:45 ` Balsundar.P
2019-11-28 12:09 ` Hannes Reinecke
2019-12-04 15:02 ` Hannes Reinecke
2019-11-20 10:31 ` Hannes Reinecke [this message]
2019-11-20 10:31 ` [PATCH 10/11] aacraid: use scsi_host_busy_iter() in get_num_of_incomplete_fibs() Hannes Reinecke
2019-11-28 11:42 ` Balsundar.P
2019-11-20 10:31 ` [PATCH 11/11] scsi: Remove cmd_list functionality Hannes Reinecke
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