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c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1738257188; 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=bybbmbp4o3dm/8LvP5Lj7D6zru5NTPZT+ktuCm9LAKE=; b=ZPu9WA+rllL+3kYFWkJ0xwiqqUEQoJkezWYWj5wtCpViVUyLS/ysq3abPQVeCqUxalT6CK Luag/QwCW/kdvRCE+8Ixbbnay3I1hWpZhcl7fImCD/PJCrhymOo1CRFDfk8MnHL3dyIxT+ hXxAqGr8iOJXNfehsNOk8KGKlHOAnxQ= X-MC-Unique: Ljjwrv_tOZqs4wdk1OkJwA-1 X-Mimecast-MFC-AGG-ID: Ljjwrv_tOZqs4wdk1OkJwA 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 v2 05/15] block: Allow inactivating already inactive nodes Date: Thu, 30 Jan 2025 18:12:36 +0100 Message-ID: <20250130171240.286878-6-kwolf@redhat.com> In-Reply-To: <20250130171240.286878-1-kwolf@redhat.com> References: <20250130171240.286878-1-kwolf@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.4 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" What we wanted to catch with the assertion is cases where the recursion finds that a child was inactive before its parent. This should never happen. But if the user tries to inactivate an image that is already inactive, that's harmless and we don't want to fail the assertion. Signed-off-by: Kevin Wolf Reviewed-by: Eric Blake Reviewed-by: Stefan Hajnoczi --- block.c | 16 ++++++++++++---- 1 file changed, 12 insertions(+), 4 deletions(-) diff --git a/block.c b/block.c index 94368a200e..be6b71c314 100644 --- a/block.c +++ b/block.c @@ -6960,7 +6960,8 @@ bdrv_has_bds_parent(BlockDriverState *bs, bool only_a= ctive) return false; } =20 -static int GRAPH_RDLOCK bdrv_inactivate_recurse(BlockDriverState *bs) +static int GRAPH_RDLOCK +bdrv_inactivate_recurse(BlockDriverState *bs, bool top_level) { BdrvChild *child, *parent; int ret; @@ -6978,7 +6979,14 @@ static int GRAPH_RDLOCK bdrv_inactivate_recurse(Bloc= kDriverState *bs) return 0; } =20 - assert(!(bs->open_flags & BDRV_O_INACTIVE)); + /* + * Inactivating an already inactive node on user request is harmless, = but if + * a child is already inactive before its parent, that's bad. + */ + if (bs->open_flags & BDRV_O_INACTIVE) { + assert(top_level); + return 0; + } =20 /* Inactivate this node */ if (bs->drv->bdrv_inactivate) { @@ -7015,7 +7023,7 @@ static int GRAPH_RDLOCK bdrv_inactivate_recurse(Block= DriverState *bs) =20 /* Recursively inactivate children */ QLIST_FOREACH(child, &bs->children, next) { - ret =3D bdrv_inactivate_recurse(child->bs); + ret =3D bdrv_inactivate_recurse(child->bs, false); if (ret < 0) { return ret; } @@ -7040,7 +7048,7 @@ int bdrv_inactivate_all(void) if (bdrv_has_bds_parent(bs, false)) { continue; } - ret =3D bdrv_inactivate_recurse(bs); + ret =3D bdrv_inactivate_recurse(bs, true); if (ret < 0) { bdrv_next_cleanup(&it); break; --=20 2.48.1