From dcece99e86b1191d2789fb5b5caa4c5b7fc2bfef Mon Sep 17 00:00:00 2001 From: Hannes Reinecke Date: Fri, 28 Feb 2020 08:53:15 +0100 Subject: scsi: core: add scsi_host_busy_iter() 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. Link: https://lore.kernel.org/r/20200228075318.91255-11-hare@suse.de Signed-off-by: Hannes Reinecke Signed-off-by: Martin K. Petersen --- drivers/scsi/hosts.c | 37 +++++++++++++++++++++++++++++++++++++ 1 file changed, 37 insertions(+) (limited to 'drivers/scsi') diff --git a/drivers/scsi/hosts.c b/drivers/scsi/hosts.c index 00ae9d43ce9f..7ec91c3a66ca 100644 --- a/drivers/scsi/hosts.c +++ b/drivers/scsi/hosts.c @@ -678,3 +678,40 @@ 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 { + bool (*fn)(struct scsi_cmnd *, void *, bool); + 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 + * + * If locking against concurrent command completions is required + * ithas to be provided by the caller + **/ +void scsi_host_busy_iter(struct Scsi_Host *shost, + bool (*fn)(struct scsi_cmnd *, void *, bool), + 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); -- cgit v1.2.3