From: Hannes Reinecke <hare@xxxxxxx> Add an iterator scsi_host_tagset_busy_iter() to easily traverse all busy commands. No locking is done here; this need to be ensured by the caller. Signed-off-by: Hannes Reinecke <hare@xxxxxxxx> --- drivers/scsi/hosts.c | 27 +++++++++++++++++++++++++++ include/scsi/scsi_host.h | 5 +++++ 2 files changed, 32 insertions(+) diff --git a/drivers/scsi/hosts.c b/drivers/scsi/hosts.c index 1d669e47b692..97704a630f8e 100644 --- a/drivers/scsi/hosts.c +++ b/drivers/scsi/hosts.c @@ -650,3 +650,30 @@ void scsi_flush_work(struct Scsi_Host *shost) flush_workqueue(shost->work_q); } EXPORT_SYMBOL_GPL(scsi_flush_work); + +struct scsi_host_tagset_busy_iter_data { + scsi_host_busy_iter_fn *fn; + void *priv; +}; + +static bool scsi_host_tagset_busy_iter_fn(struct request *req, void *priv, + bool reserved) +{ + struct scsi_host_tagset_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); +} + +void scsi_host_tagset_busy_iter(struct Scsi_Host *shost, + scsi_host_busy_iter_fn *fn, void *priv) +{ + struct scsi_host_tagset_busy_iter_data iter_data = { + .fn = fn, + .priv = priv, + }; + + blk_mq_tagset_busy_iter(&shost->tag_set, scsi_host_tagset_busy_iter_fn, + &iter_data); +} +EXPORT_SYMBOL_GPL(scsi_host_tagset_busy_iter); diff --git a/include/scsi/scsi_host.h b/include/scsi/scsi_host.h index 2258a4f7b4d8..663aef22437a 100644 --- a/include/scsi/scsi_host.h +++ b/include/scsi/scsi_host.h @@ -767,6 +767,11 @@ 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_tagset_busy_iter(struct Scsi_Host *, + scsi_host_busy_iter_fn *fn, void *priv); + struct class_container; /* -- 2.17.1