[Qemu-devel] [PATCH 25/32] scsi-disk: report resized disk via sense codes

[Paolo Bonzini <pbonzini@redhat.com>]

Linux will not use these, but a very similar mechanism will be used to
report the condition via virtio-scsi events.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 hw/scsi-bus.c  |    5 +++++
 hw/scsi-disk.c |   24 ++++++++++++++++++++++--
 hw/scsi.h      |    2 ++
 3 files changed, 29 insertions(+), 2 deletions(-)

diff --git a/hw/scsi-bus.c b/hw/scsi-bus.c
index c38c0ec..04262de 100644
--- a/hw/scsi-bus.c
+++ b/hw/scsi-bus.c
@@ -1161,6 +1161,11 @@ const struct SCSISense sense_code_LUN_FAILURE = {
     .key = ABORTED_COMMAND, .asc = 0x3e, .ascq = 0x01
 };
 
+/* Unit attention, Capacity data has changed */
+const struct SCSISense sense_code_CAPACITY_CHANGED = {
+    .key = UNIT_ATTENTION, .asc = 0x2a, .ascq = 0x09
+};
+
 /* Unit attention, Power on, reset or bus device reset occurred */
 const struct SCSISense sense_code_RESET = {
     .key = UNIT_ATTENTION, .asc = 0x29, .ascq = 0x00
diff --git a/hw/scsi-disk.c b/hw/scsi-disk.c
index 734fe13..9ba405f 100644
--- a/hw/scsi-disk.c
+++ b/hw/scsi-disk.c
@@ -1860,6 +1860,18 @@ static void scsi_destroy(SCSIDevice *dev)
     blockdev_mark_auto_del(s->qdev.conf.bs);
 }
 
+static void scsi_disk_resize_cb(void *opaque)
+{
+    SCSIDiskState *s = opaque;
+
+    /* SPC lists this sense code as available only for
+     * direct-access devices.
+     */
+    if (s->qdev.type == TYPE_DISK) {
+        scsi_device_set_ua(&s->qdev, SENSE_CODE(CAPACITY_CHANGED));
+    }
+}
+
 static void scsi_cd_change_media_cb(void *opaque, bool load)
 {
     SCSIDiskState *s = opaque;
@@ -1901,11 +1913,17 @@ static bool scsi_cd_is_medium_locked(void *opaque)
     return ((SCSIDiskState *)opaque)->tray_locked;
 }
 
-static const BlockDevOps scsi_cd_block_ops = {
+static const BlockDevOps scsi_disk_removable_block_ops = {
     .change_media_cb = scsi_cd_change_media_cb,
     .eject_request_cb = scsi_cd_eject_request_cb,
     .is_tray_open = scsi_cd_is_tray_open,
     .is_medium_locked = scsi_cd_is_medium_locked,
+
+    .resize_cb = scsi_disk_resize_cb,
+};
+
+static const BlockDevOps scsi_disk_block_ops = {
+    .resize_cb = scsi_disk_resize_cb,
 };
 
 static void scsi_disk_unit_attention_reported(SCSIDevice *dev)
@@ -1950,7 +1968,9 @@ static int scsi_initfn(SCSIDevice *dev)
     }
 
     if (s->features & (1 << SCSI_DISK_F_REMOVABLE)) {
-        bdrv_set_dev_ops(s->qdev.conf.bs, &scsi_cd_block_ops, s);
+        bdrv_set_dev_ops(s->qdev.conf.bs, &scsi_disk_removable_block_ops, s);
+    } else {
+        bdrv_set_dev_ops(s->qdev.conf.bs, &scsi_disk_block_ops, s);
     }
     bdrv_set_buffer_alignment(s->qdev.conf.bs, s->qdev.blocksize);
 
diff --git a/hw/scsi.h b/hw/scsi.h
index f920208..82a5fc8 100644
--- a/hw/scsi.h
+++ b/hw/scsi.h
@@ -200,6 +200,8 @@ extern const struct SCSISense sense_code_IO_ERROR;
 extern const struct SCSISense sense_code_I_T_NEXUS_LOSS;
 /* Command aborted, Logical Unit failure */
 extern const struct SCSISense sense_code_LUN_FAILURE;
+/* LUN not ready, Capacity data has changed */
+extern const struct SCSISense sense_code_CAPACITY_CHANGED;
 /* LUN not ready, Medium not present */
 extern const struct SCSISense sense_code_UNIT_ATTENTION_NO_MEDIUM;
 /* Unit attention, Power on, reset or bus device reset occurred */
-- 
1.7.10.4