From 1a5dc166cd8843252169f52cb714b324f6d679ef Mon Sep 17 00:00:00 2001 From: Hannes Reinecke Date: Thu, 3 Mar 2016 07:54:10 +0100 Subject: [PATCH] scsi_dh_rdac: update 'access_state' field Track attached SCSI devices and update the 'access_state' whenever the path state of the device changes. Signed-off-by: Hannes Reinecke Reviewed-by: Christoph Hellwig Reviewed-by: Johannes Thumshirn Signed-off-by: Martin K. Petersen --- drivers/scsi/device_handler/scsi_dh_rdac.c | 38 ++++++++++++++++++---- 1 file changed, 31 insertions(+), 7 deletions(-) diff --git a/drivers/scsi/device_handler/scsi_dh_rdac.c b/drivers/scsi/device_handler/scsi_dh_rdac.c index 93880ed6291c..06fbd0b0c68a 100644 --- a/drivers/scsi/device_handler/scsi_dh_rdac.c +++ b/drivers/scsi/device_handler/scsi_dh_rdac.c @@ -165,6 +165,7 @@ struct rdac_controller { struct work_struct ms_work; struct scsi_device *ms_sdev; struct list_head ms_head; + struct list_head dh_list; }; struct c2_inquiry { @@ -181,7 +182,9 @@ struct c2_inquiry { }; struct rdac_dh_data { + struct list_head node; struct rdac_controller *ctlr; + struct scsi_device *sdev; #define UNINITIALIZED_LUN (1 << 8) unsigned lun; @@ -392,6 +395,7 @@ static struct rdac_controller *get_controller(int index, char *array_name, INIT_WORK(&ctlr->ms_work, send_mode_select); INIT_LIST_HEAD(&ctlr->ms_head); list_add(&ctlr->node, &ctlr_list); + INIT_LIST_HEAD(&ctlr->dh_list); return ctlr; } @@ -455,7 +459,8 @@ static int get_lun_info(struct scsi_device *sdev, struct rdac_dh_data *h, static int check_ownership(struct scsi_device *sdev, struct rdac_dh_data *h) { - int err; + int err, access_state; + struct rdac_dh_data *tmp; struct c9_inquiry *inqp; h->state = RDAC_STATE_ACTIVE; @@ -471,19 +476,31 @@ static int check_ownership(struct scsi_device *sdev, struct rdac_dh_data *h) h->mode = RDAC_MODE; /* LUN in RDAC mode */ /* Update ownership */ - if (inqp->avte_cvp & 0x1) + if (inqp->avte_cvp & 0x1) { h->lun_state = RDAC_LUN_OWNED; - else { + access_state = SCSI_ACCESS_STATE_OPTIMAL; + } else { h->lun_state = RDAC_LUN_UNOWNED; - if (h->mode == RDAC_MODE) + if (h->mode == RDAC_MODE) { h->state = RDAC_STATE_PASSIVE; + access_state = SCSI_ACCESS_STATE_STANDBY; + } else + access_state = SCSI_ACCESS_STATE_ACTIVE; } /* Update path prio*/ - if (inqp->path_prio & 0x1) + if (inqp->path_prio & 0x1) { h->preferred = RDAC_PREFERRED; - else + access_state |= SCSI_ACCESS_STATE_PREFERRED; + } else h->preferred = RDAC_NON_PREFERRED; + rcu_read_lock(); + list_for_each_entry_rcu(tmp, &h->ctlr->dh_list, node) { + /* h->sdev should always be valid */ + BUG_ON(!tmp->sdev); + tmp->sdev->access_state = access_state; + } + rcu_read_unlock(); } return err; @@ -508,6 +525,10 @@ static int initialize_controller(struct scsi_device *sdev, h->ctlr = get_controller(index, array_name, array_id, sdev); if (!h->ctlr) err = SCSI_DH_RES_TEMP_UNAVAIL; + else { + list_add_rcu(&h->node, &h->ctlr->dh_list); + h->sdev = sdev; + } spin_unlock(&list_lock); } return err; @@ -829,8 +850,11 @@ static void rdac_bus_detach( struct scsi_device *sdev ) flush_workqueue(kmpath_rdacd); spin_lock(&list_lock); - if (h->ctlr) + if (h->ctlr) { + list_del_rcu(&h->node); + h->sdev = NULL; kref_put(&h->ctlr->kref, release_controller); + } spin_unlock(&list_lock); sdev->handler_data = NULL; kfree(h); -- 2.20.1