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bh=cVDPPpEZfgvBqHPYP78ibHeFywV1qIbiXW18X7UxDPg=; b=Rgt0MR5whOBQBqIIIRIXtke4oROAGxzr/7cqCc/3SXd8u4vKqNQxl4HL0ghspQorDyzq7o 4+tsWKpoj2zoWRIo+ZUQ/4hrgHUIOwZdQJdpZa49KratNxU2je9rgqRHqT09QurxkPwTi6 jtf7iy39+pbMgMT5lHd9eiWPHLvg1I4= X-MC-Unique: OEsDglB4OEq2YjHXxr7pOw-1 From: Max Reitz To: qemu-block@nongnu.org Subject: [PATCH 1/3] mirror: Set s->base_overlay only if s->base is set Date: Wed, 2 Sep 2020 18:48:39 +0200 Message-Id: <20200902164841.214948-2-mreitz@redhat.com> In-Reply-To: <20200902164841.214948-1-mreitz@redhat.com> References: <20200902164841.214948-1-mreitz@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=mreitz@redhat.com X-Mimecast-Spam-Score: 0.001 X-Mimecast-Originator: redhat.com Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; 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charset="utf-8" This way, sync=3Dfull will not need a reference to any node other than the source and the target. Signed-off-by: Max Reitz --- block/mirror.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) diff --git a/block/mirror.c b/block/mirror.c index 26acf4af6f..11ebffdf99 100644 --- a/block/mirror.c +++ b/block/mirror.c @@ -42,6 +42,7 @@ typedef struct MirrorBlockJob { BlockBackend *target; BlockDriverState *mirror_top_bs; BlockDriverState *base; + /* Overlay of @base if @base is non-NULL; NULL otherwise */ BlockDriverState *base_overlay; =20 /* The name of the graph node to replace */ @@ -839,8 +840,9 @@ static int coroutine_fn mirror_dirty_init(MirrorBlockJo= b *s) return 0; } =20 - ret =3D bdrv_is_allocated_above(bs, s->base_overlay, true, offset,= bytes, - &count); + ret =3D bdrv_is_allocated_above(bs, s->base_overlay, + s->base_overlay !=3D NULL, + offset, bytes, &count); if (ret < 0) { return ret; } @@ -1710,7 +1712,7 @@ static BlockJob *mirror_start_job( s->zero_target =3D zero_target; s->copy_mode =3D copy_mode; s->base =3D base; - s->base_overlay =3D bdrv_find_overlay(bs, base); + s->base_overlay =3D base ? bdrv_find_overlay(bs, base) : NULL; s->granularity =3D granularity; s->buf_size =3D ROUND_UP(buf_size, granularity); s->unmap =3D unmap; --=20 2.26.2