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bh=0082Lo4MDolrcETSjUoN1/VyBCJMMbq8vm2eo+Y/Rp4=; b=M/TqLYQFRhnuLvpAHEmHLmJQRwWwM9WZ5kog9ShgGi7/1bhZcX4E3+3Awlok//5wVOAvF3 StfG1rV5O+xh9uZRHtMFVDD85OoJjUrUiPwi2JXafss+OUlNgocLlHcdnSWyI96LySnxQG IC7L1pWp+VAb6hQ8uQyYA4usmLyG6x8= X-MC-Unique: u29UpLGIM_SLHJfDyzXMGQ-1 From: Stefan Hajnoczi To: Peter Maydell , qemu-devel@nongnu.org Subject: [PULL v2 29/30] block/io: fix bdrv_is_allocated_above Date: Mon, 12 Oct 2020 19:27:59 +0100 Message-Id: <20201012182800.157697-30-stefanha@redhat.com> In-Reply-To: <20201012182800.157697-1-stefanha@redhat.com> References: <20201012182800.157697-1-stefanha@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.15 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=stefanha@redhat.com X-Mimecast-Spam-Score: 0 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; 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charset="utf-8" From: Vladimir Sementsov-Ogievskiy bdrv_is_allocated_above wrongly handles short backing files: it reports after-EOF space as UNALLOCATED which is wrong, as on read the data is generated on the level of short backing file (if all overlays have unallocated areas at that place). Reusing bdrv_common_block_status_above fixes the issue and unifies code path. Signed-off-by: Vladimir Sementsov-Ogievskiy Reviewed-by: Eric Blake Reviewed-by: Alberto Garcia Message-id: 20200924194003.22080-5-vsementsov@virtuozzo.com [Fix s/has/have/ as suggested by Eric Blake. Fix s/area/areas/. --Stefan] Signed-off-by: Stefan Hajnoczi --- block/io.c | 43 +++++-------------------------------------- 1 file changed, 5 insertions(+), 38 deletions(-) diff --git a/block/io.c b/block/io.c index b616bc4ada..02528b3823 100644 --- a/block/io.c +++ b/block/io.c @@ -2477,52 +2477,19 @@ int coroutine_fn bdrv_is_allocated(BlockDriverState= *bs, int64_t offset, * at 'offset + *pnum' may return the same allocation status (in other * words, the result is not necessarily the maximum possible range); * but 'pnum' will only be 0 when end of file is reached. - * */ int bdrv_is_allocated_above(BlockDriverState *top, BlockDriverState *base, bool include_base, int64_t offset, int64_t bytes, int64_t *pnum) { - BlockDriverState *intermediate; - int ret; - int64_t n =3D bytes; - - assert(base || !include_base); - - intermediate =3D top; - while (include_base || intermediate !=3D base) { - int64_t pnum_inter; - int64_t size_inter; - - assert(intermediate); - ret =3D bdrv_is_allocated(intermediate, offset, bytes, &pnum_inter= ); - if (ret < 0) { - return ret; - } - if (ret) { - *pnum =3D pnum_inter; - return 1; - } - - size_inter =3D bdrv_getlength(intermediate); - if (size_inter < 0) { - return size_inter; - } - if (n > pnum_inter && - (intermediate =3D=3D top || offset + pnum_inter < size_inter))= { - n =3D pnum_inter; - } - - if (intermediate =3D=3D base) { - break; - } - - intermediate =3D bdrv_filter_or_cow_bs(intermediate); + int ret =3D bdrv_common_block_status_above(top, base, include_base, fa= lse, + offset, bytes, pnum, NULL, NU= LL); + if (ret < 0) { + return ret; } =20 - *pnum =3D n; - return 0; + return !!(ret & BDRV_BLOCK_ALLOCATED); } =20 int coroutine_fn --=20 2.26.2