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Re: [Qemu-devel] [PATCH 3/3] virtio-scsi: Remove op blocker for dataplan
From: |
Michael S. Tsirkin |
Subject: |
Re: [Qemu-devel] [PATCH 3/3] virtio-scsi: Remove op blocker for dataplane |
Date: |
Wed, 18 May 2016 11:26:19 +0300 |
On Wed, May 18, 2016 at 04:24:10PM +0800, Fam Zheng wrote:
> The previous patch dropped all op blockers from virtio-blk data plane.
> The situation of virtio-scsi is exactly the same it can drop them too.
>
> Signed-off-by: Fam Zheng <address@hidden>
Acked-by: Michael S. Tsirkin <address@hidden>
> ---
> hw/scsi/virtio-scsi.c | 62
> -----------------------------------------
> include/hw/virtio/virtio-scsi.h | 11 --------
> 2 files changed, 73 deletions(-)
>
> diff --git a/hw/scsi/virtio-scsi.c b/hw/scsi/virtio-scsi.c
> index 30415c6..d26f490 100644
> --- a/hw/scsi/virtio-scsi.c
> +++ b/hw/scsi/virtio-scsi.c
> @@ -773,22 +773,6 @@ static void virtio_scsi_change(SCSIBus *bus, SCSIDevice
> *dev, SCSISense sense)
> }
> }
>
> -static void virtio_scsi_blk_insert_notifier(Notifier *n, void *data)
> -{
> - VirtIOSCSIBlkChangeNotifier *cn = DO_UPCAST(VirtIOSCSIBlkChangeNotifier,
> - n, n);
> - assert(cn->sd->conf.blk == data);
> - blk_op_block_all(cn->sd->conf.blk, cn->s->blocker);
> -}
> -
> -static void virtio_scsi_blk_remove_notifier(Notifier *n, void *data)
> -{
> - VirtIOSCSIBlkChangeNotifier *cn = DO_UPCAST(VirtIOSCSIBlkChangeNotifier,
> - n, n);
> - assert(cn->sd->conf.blk == data);
> - blk_op_unblock_all(cn->sd->conf.blk, cn->s->blocker);
> -}
> -
> static void virtio_scsi_hotplug(HotplugHandler *hotplug_dev, DeviceState
> *dev,
> Error **errp)
> {
> @@ -797,29 +781,13 @@ static void virtio_scsi_hotplug(HotplugHandler
> *hotplug_dev, DeviceState *dev,
> SCSIDevice *sd = SCSI_DEVICE(dev);
>
> if (s->ctx && !s->dataplane_fenced) {
> - VirtIOSCSIBlkChangeNotifier *insert_notifier, *remove_notifier;
> -
> if (blk_op_is_blocked(sd->conf.blk, BLOCK_OP_TYPE_DATAPLANE, errp)) {
> return;
> }
> - blk_op_block_all(sd->conf.blk, s->blocker);
> aio_context_acquire(s->ctx);
> blk_set_aio_context(sd->conf.blk, s->ctx);
> aio_context_release(s->ctx);
>
> - insert_notifier = g_new0(VirtIOSCSIBlkChangeNotifier, 1);
> - insert_notifier->n.notify = virtio_scsi_blk_insert_notifier;
> - insert_notifier->s = s;
> - insert_notifier->sd = sd;
> - blk_add_insert_bs_notifier(sd->conf.blk, &insert_notifier->n);
> - QTAILQ_INSERT_TAIL(&s->insert_notifiers, insert_notifier, next);
> -
> - remove_notifier = g_new0(VirtIOSCSIBlkChangeNotifier, 1);
> - remove_notifier->n.notify = virtio_scsi_blk_remove_notifier;
> - remove_notifier->s = s;
> - remove_notifier->sd = sd;
> - blk_add_remove_bs_notifier(sd->conf.blk, &remove_notifier->n);
> - QTAILQ_INSERT_TAIL(&s->remove_notifiers, remove_notifier, next);
> }
>
> if (virtio_vdev_has_feature(vdev, VIRTIO_SCSI_F_HOTPLUG)) {
> @@ -835,7 +803,6 @@ static void virtio_scsi_hotunplug(HotplugHandler
> *hotplug_dev, DeviceState *dev,
> VirtIODevice *vdev = VIRTIO_DEVICE(hotplug_dev);
> VirtIOSCSI *s = VIRTIO_SCSI(vdev);
> SCSIDevice *sd = SCSI_DEVICE(dev);
> - VirtIOSCSIBlkChangeNotifier *insert_notifier, *remove_notifier;
>
> if (virtio_vdev_has_feature(vdev, VIRTIO_SCSI_F_HOTPLUG)) {
> virtio_scsi_push_event(s, sd,
> @@ -843,28 +810,6 @@ static void virtio_scsi_hotunplug(HotplugHandler
> *hotplug_dev, DeviceState *dev,
> VIRTIO_SCSI_EVT_RESET_REMOVED);
> }
>
> - if (s->ctx) {
> - blk_op_unblock_all(sd->conf.blk, s->blocker);
> - }
> -
> - QTAILQ_FOREACH(insert_notifier, &s->insert_notifiers, next) {
> - if (insert_notifier->sd == sd) {
> - notifier_remove(&insert_notifier->n);
> - QTAILQ_REMOVE(&s->insert_notifiers, insert_notifier, next);
> - g_free(insert_notifier);
> - break;
> - }
> - }
> -
> - QTAILQ_FOREACH(remove_notifier, &s->remove_notifiers, next) {
> - if (remove_notifier->sd == sd) {
> - notifier_remove(&remove_notifier->n);
> - QTAILQ_REMOVE(&s->remove_notifiers, remove_notifier, next);
> - g_free(remove_notifier);
> - break;
> - }
> - }
> -
> qdev_simple_device_unplug_cb(hotplug_dev, dev, errp);
> }
>
> @@ -950,11 +895,6 @@ static void virtio_scsi_device_realize(DeviceState *dev,
> Error **errp)
>
> register_savevm(dev, "virtio-scsi", virtio_scsi_id++, 1,
> virtio_scsi_save, virtio_scsi_load, s);
> -
> - error_setg(&s->blocker, "block device is in use by data plane");
> -
> - QTAILQ_INIT(&s->insert_notifiers);
> - QTAILQ_INIT(&s->remove_notifiers);
> }
>
> static void virtio_scsi_instance_init(Object *obj)
> @@ -980,8 +920,6 @@ static void virtio_scsi_device_unrealize(DeviceState
> *dev, Error **errp)
> {
> VirtIOSCSI *s = VIRTIO_SCSI(dev);
>
> - error_free(s->blocker);
> -
> unregister_savevm(dev, "virtio-scsi", s);
> virtio_scsi_common_unrealize(dev, errp);
> }
> diff --git a/include/hw/virtio/virtio-scsi.h b/include/hw/virtio/virtio-scsi.h
> index ba2f5ce..b515669 100644
> --- a/include/hw/virtio/virtio-scsi.h
> +++ b/include/hw/virtio/virtio-scsi.h
> @@ -68,13 +68,6 @@ typedef struct VirtIOSCSICommon {
> VirtQueue **cmd_vqs;
> } VirtIOSCSICommon;
>
> -typedef struct VirtIOSCSIBlkChangeNotifier {
> - Notifier n;
> - struct VirtIOSCSI *s;
> - SCSIDevice *sd;
> - QTAILQ_ENTRY(VirtIOSCSIBlkChangeNotifier) next;
> -} VirtIOSCSIBlkChangeNotifier;
> -
> typedef struct VirtIOSCSI {
> VirtIOSCSICommon parent_obj;
>
> @@ -85,14 +78,10 @@ typedef struct VirtIOSCSI {
> /* Fields for dataplane below */
> AioContext *ctx; /* one iothread per virtio-scsi-pci for now */
>
> - QTAILQ_HEAD(, VirtIOSCSIBlkChangeNotifier) insert_notifiers;
> - QTAILQ_HEAD(, VirtIOSCSIBlkChangeNotifier) remove_notifiers;
> -
> bool dataplane_started;
> bool dataplane_starting;
> bool dataplane_stopping;
> bool dataplane_fenced;
> - Error *blocker;
> uint32_t host_features;
> } VirtIOSCSI;
>
> --
> 2.8.2
- [Qemu-devel] [PATCH 0/3] Drop virtio-{blk,scsi} op blockers, Fam Zheng, 2016/05/18
- [Qemu-devel] [PATCH 1/3] blockdev-backup: Don't move target AioContext if it's attached, Fam Zheng, 2016/05/18
- [Qemu-devel] [PATCH 2/3] virtio-blk: Remove op blocker for dataplane, Fam Zheng, 2016/05/18
- [Qemu-devel] [PATCH 3/3] virtio-scsi: Remove op blocker for dataplane, Fam Zheng, 2016/05/18
- Re: [Qemu-devel] [PATCH 3/3] virtio-scsi: Remove op blocker for dataplane,
Michael S. Tsirkin <=
- Re: [Qemu-devel] [PATCH 0/3] Drop virtio-{blk,scsi} op blockers, Michael S. Tsirkin, 2016/05/18
- Re: [Qemu-devel] [PATCH 0/3] Drop virtio-{blk,scsi} op blockers, Stefan Hajnoczi, 2016/05/19
- Re: [Qemu-devel] [PATCH 0/3] Drop virtio-{blk,scsi} op blockers, Stefan Hajnoczi, 2016/05/19