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c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1738703692; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=M77wY3XQpgdSWWt9+WspspBYZRFRebBuk7NcoaOSmUI=; b=USROpvkHqrAWDr2hLkpvYvqoAiUIZWVlWXwxoX+6ODBuH98pjATy8jOT6mHlbLMeFjMs4y S4E7dddhwOlAVVSpChoP2vjbI6lxFswtCP1HO11QTG74zA55NYfNEAoPBiifXk+RpKZKcA vr/o2hAcjIkJnUqboEBQyZtrYl7moGw= X-MC-Unique: iEhA6e4wPGGOMyPZ24NFgg-1 X-Mimecast-MFC-AGG-ID: iEhA6e4wPGGOMyPZ24NFgg From: Kevin Wolf To: qemu-block@nongnu.org Cc: kwolf@redhat.com, hreitz@redhat.com, stefanha@redhat.com, pkrempa@redhat.com, peterx@redhat.com, farosas@suse.de, qemu-devel@nongnu.org Subject: [PATCH v3 09/16] block: Support inactive nodes in blk_insert_bs() Date: Tue, 4 Feb 2025 22:14:00 +0100 Message-ID: <20250204211407.381505-10-kwolf@redhat.com> In-Reply-To: <20250204211407.381505-1-kwolf@redhat.com> References: <20250204211407.381505-1-kwolf@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.93 Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; 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charset="utf-8" Device models have a relatively complex way to set up their block backends, in which blk_attach_dev() sets blk->disable_perm =3D true. We want to support inactive images in exports, too, so that qemu-storage-daemon can be used with migration. Because they don't use blk_attach_dev(), they need another way to set this flag. The most convenient is to do this automatically when an inactive node is attached to a BlockBackend that can be inactivated. Signed-off-by: Kevin Wolf Acked-by: Fabiano Rosas Reviewed-by: Eric Blake Reviewed-by: Stefan Hajnoczi --- block/block-backend.c | 14 ++++++++++++-- 1 file changed, 12 insertions(+), 2 deletions(-) diff --git a/block/block-backend.c b/block/block-backend.c index cc6f58ae78..9288f7e1c6 100644 --- a/block/block-backend.c +++ b/block/block-backend.c @@ -900,14 +900,24 @@ void blk_remove_bs(BlockBackend *blk) int blk_insert_bs(BlockBackend *blk, BlockDriverState *bs, Error **errp) { ThrottleGroupMember *tgm =3D &blk->public.throttle_group_member; + uint64_t perm, shared_perm; =20 GLOBAL_STATE_CODE(); bdrv_ref(bs); bdrv_graph_wrlock(); + + if ((bs->open_flags & BDRV_O_INACTIVE) && blk_can_inactivate(blk)) { + blk->disable_perm =3D true; + perm =3D 0; + shared_perm =3D BLK_PERM_ALL; + } else { + perm =3D blk->perm; + shared_perm =3D blk->shared_perm; + } + blk->root =3D bdrv_root_attach_child(bs, "root", &child_root, BDRV_CHILD_FILTERED | BDRV_CHILD_PR= IMARY, - blk->perm, blk->shared_perm, - blk, errp); + perm, shared_perm, blk, errp); bdrv_graph_wrunlock(); if (blk->root =3D=3D NULL) { return -EPERM; --=20 2.48.1