On 22.09.2015 09:44, Wen Congyang wrote: > In some cases, we want to take a quorum child offline, and take > another child online. > > Signed-off-by: Wen Congyang <we...@cn.fujitsu.com> > Signed-off-by: zhanghailiang <zhang.zhanghaili...@huawei.com> > Signed-off-by: Gonglei <arei.gong...@huawei.com> > Reviewed-by: Eric Blake <ebl...@redhat.com> > --- > block.c | 50 > +++++++++++++++++++++++++++++++++++++++++++++++ > include/block/block.h | 5 +++++ > include/block/block_int.h | 5 +++++ > 3 files changed, 60 insertions(+) > > diff --git a/block.c b/block.c > index e815d73..1b25e43 100644 > --- a/block.c > +++ b/block.c > @@ -4265,3 +4265,53 @@ BlockAcctStats *bdrv_get_stats(BlockDriverState *bs) > { > return &bs->stats; > } > + > +/* > + * Hot add/remove a BDS's child. So the user can take a child offline when > + * it is broken and take a new child online > + */ > +void bdrv_add_child(BlockDriverState *parent_bs, BlockDriverState *child_bs, > + Error **errp) > +{ > + > + if (!parent_bs->drv || !parent_bs->drv->bdrv_add_child) { > + error_setg(errp, "The BDS %s doesn't support adding a child", > + bdrv_get_device_or_node_name(parent_bs)); > + return; > + } > + > + if (!QLIST_EMPTY(&child_bs->parents)) { > + error_setg(errp, "The BDS %s already has parent", > + child_bs->node_name); > + return; > + } > + > + parent_bs->drv->bdrv_add_child(parent_bs, child_bs, errp); > +} > + > +void bdrv_del_child(BlockDriverState *parent_bs, BlockDriverState *child_bs, > + Error **errp) > +{ > + BdrvChild *child; > + > + if (!parent_bs->drv || !parent_bs->drv->bdrv_del_child) { > + error_setg(errp, "The BDS %s doesn't support removing a child", > + bdrv_get_device_or_node_name(parent_bs)); > + return; > + } > + > + QLIST_FOREACH(child, &parent_bs->children, next) { > + if (child->bs == child_bs) { > + break; > + } > + } > + > + if (!child) { > + error_setg(errp, "BDS %s is not a child of %s", > + bdrv_get_device_or_node_name(child_bs), > + bdrv_get_device_or_node_name(parent_bs)); > + return; > + } > + > + parent_bs->drv->bdrv_del_child(parent_bs, child_bs, errp);
How about we make this (BlockDriver.bdrv_del_child()) take a BdrvChild instead of a BDS? We could even make bdrv_del_child() as a whole take a BdrvChild parameter, but I don't suppose that would help much. Max > +} > diff --git a/include/block/block.h b/include/block/block.h > index ef67353..665c56f 100644 > --- a/include/block/block.h > +++ b/include/block/block.h > @@ -616,4 +616,9 @@ void bdrv_flush_io_queue(BlockDriverState *bs); > > BlockAcctStats *bdrv_get_stats(BlockDriverState *bs); > > +void bdrv_add_child(BlockDriverState *parent, BlockDriverState *child, > + Error **errp); > +void bdrv_del_child(BlockDriverState *parent, BlockDriverState *child, > + Error **errp); > + > #endif > diff --git a/include/block/block_int.h b/include/block/block_int.h > index 2f2c47b..64cbc55 100644 > --- a/include/block/block_int.h > +++ b/include/block/block_int.h > @@ -288,6 +288,11 @@ struct BlockDriver { > */ > int (*bdrv_probe_geometry)(BlockDriverState *bs, HDGeometry *geo); > > + void (*bdrv_add_child)(BlockDriverState *parent, BlockDriverState *child, > + Error **errp); > + void (*bdrv_del_child)(BlockDriverState *parent, BlockDriverState *child, > + Error **errp); > + > QLIST_ENTRY(BlockDriver) list; > }; > >
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