Message ID | 1453917600-2663-6-git-send-email-mreitz@redhat.com (mailing list archive) |
---|---|
State | New, archived |
Headers | show |
On Wed, 01/27 18:59, Max Reitz wrote: > Make use of the BDS-BB removal and insertion notifiers to remove or set > up, respectively, virtio-scsi's op blockers. > > Signed-off-by: Max Reitz <mreitz@redhat.com> > --- > hw/scsi/virtio-scsi.c | 55 +++++++++++++++++++++++++++++++++++++++++ > include/hw/virtio/virtio-scsi.h | 10 ++++++++ > 2 files changed, 65 insertions(+) > > diff --git a/hw/scsi/virtio-scsi.c b/hw/scsi/virtio-scsi.c > index 607593c..b508b81 100644 > --- a/hw/scsi/virtio-scsi.c > +++ b/hw/scsi/virtio-scsi.c > @@ -757,6 +757,22 @@ 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) > { > @@ -765,6 +781,22 @@ static void virtio_scsi_hotplug(HotplugHandler *hotplug_dev, DeviceState *dev, > SCSIDevice *sd = SCSI_DEVICE(dev); > > if (s->ctx && !s->dataplane_disabled) { > + VirtIOSCSIBlkChangeNotifier *insert_notifier, *remove_notifier; > + > + 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 (blk_op_is_blocked(sd->conf.blk, BLOCK_OP_TYPE_DATAPLANE, errp)) { > return; > } > @@ -787,6 +819,7 @@ 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, > @@ -797,6 +830,25 @@ static void virtio_scsi_hotunplug(HotplugHandler *hotplug_dev, DeviceState *dev, > 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); > } > > @@ -911,6 +963,9 @@ static void virtio_scsi_device_realize(DeviceState *dev, Error **errp) > add_migration_state_change_notifier(&s->migration_state_notifier); > > 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) > diff --git a/include/hw/virtio/virtio-scsi.h b/include/hw/virtio/virtio-scsi.h > index 088fe9f..0394eb2 100644 > --- a/include/hw/virtio/virtio-scsi.h > +++ b/include/hw/virtio/virtio-scsi.h > @@ -76,6 +76,13 @@ 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; > > @@ -86,6 +93,9 @@ 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; > + > /* Vring is used instead of vq in dataplane code, because of the underlying > * memory layer thread safety */ > VirtIOSCSIVring *ctrl_vring; > -- > 2.7.0 > Reviewed-by: Fam Zheng <famz@redhat.com>
Am 27.01.2016 um 18:59 hat Max Reitz geschrieben: > Make use of the BDS-BB removal and insertion notifiers to remove or set > up, respectively, virtio-scsi's op blockers. > > Signed-off-by: Max Reitz <mreitz@redhat.com> > --- > hw/scsi/virtio-scsi.c | 55 +++++++++++++++++++++++++++++++++++++++++ > include/hw/virtio/virtio-scsi.h | 10 ++++++++ > 2 files changed, 65 insertions(+) > > diff --git a/hw/scsi/virtio-scsi.c b/hw/scsi/virtio-scsi.c > index 607593c..b508b81 100644 > --- a/hw/scsi/virtio-scsi.c > +++ b/hw/scsi/virtio-scsi.c > @@ -757,6 +757,22 @@ 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) > { > @@ -765,6 +781,22 @@ static void virtio_scsi_hotplug(HotplugHandler *hotplug_dev, DeviceState *dev, > SCSIDevice *sd = SCSI_DEVICE(dev); > > if (s->ctx && !s->dataplane_disabled) { > + VirtIOSCSIBlkChangeNotifier *insert_notifier, *remove_notifier; > + > + 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 (blk_op_is_blocked(sd->conf.blk, BLOCK_OP_TYPE_DATAPLANE, errp)) { > return; > } If we take the error path here, won't we have dangling pointers in the notifier list? Kevin
On 29.01.2016 13:41, Kevin Wolf wrote: > Am 27.01.2016 um 18:59 hat Max Reitz geschrieben: >> Make use of the BDS-BB removal and insertion notifiers to remove or set >> up, respectively, virtio-scsi's op blockers. >> >> Signed-off-by: Max Reitz <mreitz@redhat.com> >> --- >> hw/scsi/virtio-scsi.c | 55 +++++++++++++++++++++++++++++++++++++++++ >> include/hw/virtio/virtio-scsi.h | 10 ++++++++ >> 2 files changed, 65 insertions(+) >> >> diff --git a/hw/scsi/virtio-scsi.c b/hw/scsi/virtio-scsi.c >> index 607593c..b508b81 100644 >> --- a/hw/scsi/virtio-scsi.c >> +++ b/hw/scsi/virtio-scsi.c >> @@ -757,6 +757,22 @@ 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) >> { >> @@ -765,6 +781,22 @@ static void virtio_scsi_hotplug(HotplugHandler *hotplug_dev, DeviceState *dev, >> SCSIDevice *sd = SCSI_DEVICE(dev); >> >> if (s->ctx && !s->dataplane_disabled) { >> + VirtIOSCSIBlkChangeNotifier *insert_notifier, *remove_notifier; >> + >> + 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 (blk_op_is_blocked(sd->conf.blk, BLOCK_OP_TYPE_DATAPLANE, errp)) { >> return; >> } > > If we take the error path here, won't we have dangling pointers in the > notifier list? Yes, I'll move it below that error path. Max
diff --git a/hw/scsi/virtio-scsi.c b/hw/scsi/virtio-scsi.c index 607593c..b508b81 100644 --- a/hw/scsi/virtio-scsi.c +++ b/hw/scsi/virtio-scsi.c @@ -757,6 +757,22 @@ 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) { @@ -765,6 +781,22 @@ static void virtio_scsi_hotplug(HotplugHandler *hotplug_dev, DeviceState *dev, SCSIDevice *sd = SCSI_DEVICE(dev); if (s->ctx && !s->dataplane_disabled) { + VirtIOSCSIBlkChangeNotifier *insert_notifier, *remove_notifier; + + 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 (blk_op_is_blocked(sd->conf.blk, BLOCK_OP_TYPE_DATAPLANE, errp)) { return; } @@ -787,6 +819,7 @@ 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, @@ -797,6 +830,25 @@ static void virtio_scsi_hotunplug(HotplugHandler *hotplug_dev, DeviceState *dev, 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); } @@ -911,6 +963,9 @@ static void virtio_scsi_device_realize(DeviceState *dev, Error **errp) add_migration_state_change_notifier(&s->migration_state_notifier); 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) diff --git a/include/hw/virtio/virtio-scsi.h b/include/hw/virtio/virtio-scsi.h index 088fe9f..0394eb2 100644 --- a/include/hw/virtio/virtio-scsi.h +++ b/include/hw/virtio/virtio-scsi.h @@ -76,6 +76,13 @@ 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; @@ -86,6 +93,9 @@ 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; + /* Vring is used instead of vq in dataplane code, because of the underlying * memory layer thread safety */ VirtIOSCSIVring *ctrl_vring;
Make use of the BDS-BB removal and insertion notifiers to remove or set up, respectively, virtio-scsi's op blockers. Signed-off-by: Max Reitz <mreitz@redhat.com> --- hw/scsi/virtio-scsi.c | 55 +++++++++++++++++++++++++++++++++++++++++ include/hw/virtio/virtio-scsi.h | 10 ++++++++ 2 files changed, 65 insertions(+)