linux-kernel - [PATCH] Rescan the entire target on transport reset when LUN is 0

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Message-ID: <CY4PR02MB33354370E0A81E75DD9DFE74FB520@CY4PR02MB3335.namprd02.prod.outlook.com>
Date:   Fri, 28 Aug 2020 12:21:35 +0000
From:   Matej Genci <matej.genci@...anix.com>
To:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     "mst@...hat.com" <mst@...hat.com>,
        "jasowang@...hat.com" <jasowang@...hat.com>,
        "pbonzini@...hat.com" <pbonzini@...hat.com>,
        "stefanha@...hat.com" <stefanha@...hat.com>,
        "jejb@...ux.ibm.com" <jejb@...ux.ibm.com>,
        "martin.petersen@...cle.com" <martin.petersen@...cle.com>,
        "virtualization@...ts.linux-foundation.org" 
        <virtualization@...ts.linux-foundation.org>,
        "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
        Felipe Franciosi <felipe@...anix.com>,
        Matej Genci <matej.genci@...anix.com>
Subject: [PATCH] Rescan the entire target on transport reset when LUN is 0

VirtIO 1.0 spec says
    The removed and rescan events ... when sent for LUN 0, they MAY
    apply to the entire target so the driver can ask the initiator
    to rescan the target to detect this.

This change introduces the behaviour described above by scanning the
entire scsi target when LUN is set to 0. This is both a functional and a
performance fix. It aligns the driver with the spec and allows control
planes to hotplug targets with large numbers of LUNs without having to
request a RESCAN for each one of them.

Signed-off-by: Matej Genci <matej@...anix.com>
Suggested-by: Felipe Franciosi <felipe@...anix.com>
---
 drivers/scsi/virtio_scsi.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/scsi/virtio_scsi.c b/drivers/scsi/virtio_scsi.c
index bfec84aacd90..a4b9bc7b4b4a 100644
--- a/drivers/scsi/virtio_scsi.c
+++ b/drivers/scsi/virtio_scsi.c
@@ -284,7 +284,12 @@ static void virtscsi_handle_transport_reset(struct virtio_scsi *vscsi,
 
 	switch (virtio32_to_cpu(vscsi->vdev, event->reason)) {
 	case VIRTIO_SCSI_EVT_RESET_RESCAN:
-		scsi_add_device(shost, 0, target, lun);
+		if (lun == 0) {
+			scsi_scan_target(&shost->shost_gendev, 0, target,
+					 SCAN_WILD_CARD, SCSI_SCAN_INITIAL);
+		} else {
+			scsi_add_device(shost, 0, target, lun);
+		}
 		break;
 	case VIRTIO_SCSI_EVT_RESET_REMOVED:
 		sdev = scsi_device_lookup(shost, 0, target, lun);
-- 
2.20.1