From 9ab8c39284c0fc2d9d685706b2d788ab02930a08 Mon Sep 17 00:00:00 2001 From: Kevin Wolf Date: Tue, 4 Feb 2025 22:14:00 +0100 Subject: [PATCH 16/23] block: Support inactive nodes in blk_insert_bs() RH-Author: Kevin Wolf RH-MergeRequest: 339: QMP command for block device reactivation after migration RH-Jira: RHEL-54296 RHEL-78397 RH-Acked-by: Eric Blake RH-Acked-by: Stefan Hajnoczi RH-Commit: [15/22] 17405266afeddc47f73828816d0b8c1ab5ece462 (kmwolf/centos-qemu-kvm) Device models have a relatively complex way to set up their block backends, in which blk_attach_dev() sets blk->disable_perm = 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 Message-ID: <20250204211407.381505-10-kwolf@redhat.com> Signed-off-by: Kevin Wolf (cherry picked from commit c1c5c7cc4ef6c45ca769c640566fd40d2cb7d5c1) Signed-off-by: Kevin Wolf --- 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 356db1b703..4a5a1c1f6a 100644 --- a/block/block-backend.c +++ b/block/block-backend.c @@ -909,14 +909,24 @@ void blk_remove_bs(BlockBackend *blk) int blk_insert_bs(BlockBackend *blk, BlockDriverState *bs, Error **errp) { ThrottleGroupMember *tgm = &blk->public.throttle_group_member; + uint64_t perm, shared_perm; GLOBAL_STATE_CODE(); bdrv_ref(bs); bdrv_graph_wrlock(); + + if ((bs->open_flags & BDRV_O_INACTIVE) && blk_can_inactivate(blk)) { + blk->disable_perm = true; + perm = 0; + shared_perm = BLK_PERM_ALL; + } else { + perm = blk->perm; + shared_perm = blk->shared_perm; + } + blk->root = bdrv_root_attach_child(bs, "root", &child_root, BDRV_CHILD_FILTERED | BDRV_CHILD_PRIMARY, - blk->perm, blk->shared_perm, - blk, errp); + perm, shared_perm, blk, errp); bdrv_graph_wrunlock(); if (blk->root == NULL) { return -EPERM; -- 2.48.1