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Tue, 4 Feb 2020 17:09:35 +0000 (UTC) From: Max Reitz To: qemu-block@nongnu.org Subject: [PATCH v2 15/33] block: Pull out bdrv_default_perms_for_backing() Date: Tue, 4 Feb 2020 18:08:30 +0100 Message-Id: <20200204170848.614480-16-mreitz@redhat.com> In-Reply-To: <20200204170848.614480-1-mreitz@redhat.com> References: <20200204170848.614480-1-mreitz@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 X-MC-Unique: 3GowrM4oPcCr8iehtBIYlg-1 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: quoted-printable X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 205.139.110.120 X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Kevin Wolf , Vladimir Sementsov-Ogievskiy , qemu-devel@nongnu.org, Max Reitz Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" Signed-off-by: Max Reitz --- block.c | 62 +++++++++++++++++++++++++++++++++++++-------------------- 1 file changed, 40 insertions(+), 22 deletions(-) diff --git a/block.c b/block.c index 39ba6aad0a..b26ec10cce 100644 --- a/block.c +++ b/block.c @@ -2280,6 +2280,44 @@ void bdrv_filter_default_perms(BlockDriverState *bs,= BdrvChild *c, *nshared =3D (shared & DEFAULT_PERM_PASSTHROUGH) | DEFAULT_PERM_UNCHAN= GED; } =20 +static void bdrv_default_perms_for_backing(BlockDriverState *bs, BdrvChild= *c, + const BdrvChildClass *child_cla= ss, + BdrvChildRole role, + BlockReopenQueue *reopen_queue, + uint64_t perm, uint64_t shared, + uint64_t *nperm, uint64_t *nsha= red) +{ + assert(child_class =3D=3D &child_backing || + (child_class =3D=3D &child_of_bds && (role & BDRV_CHILD_COW))); + + /* + * We want consistent read from backing files if the parent needs it. + * No other operations are performed on backing files. + */ + perm &=3D BLK_PERM_CONSISTENT_READ; + + /* + * If the parent can deal with changing data, we're okay with a + * writable and resizable backing file. + * TODO Require !(perm & BLK_PERM_CONSISTENT_READ), too? + */ + if (shared & BLK_PERM_WRITE) { + shared =3D BLK_PERM_WRITE | BLK_PERM_RESIZE; + } else { + shared =3D 0; + } + + shared |=3D BLK_PERM_CONSISTENT_READ | BLK_PERM_GRAPH_MOD | + BLK_PERM_WRITE_UNCHANGED; + + if (bs->open_flags & BDRV_O_INACTIVE) { + shared |=3D BLK_PERM_WRITE | BLK_PERM_RESIZE; + } + + *nperm =3D perm; + *nshared =3D shared; +} + void bdrv_format_default_perms(BlockDriverState *bs, BdrvChild *c, const BdrvChildClass *child_class, BdrvChildRole role, @@ -2317,28 +2355,8 @@ void bdrv_format_default_perms(BlockDriverState *bs,= BdrvChild *c, *nperm =3D perm; *nshared =3D shared; } else { - /* We want consistent read from backing files if the parent needs = it. - * No other operations are performed on backing files. */ - perm &=3D BLK_PERM_CONSISTENT_READ; - - /* If the parent can deal with changing data, we're okay with a - * writable and resizable backing file. */ - /* TODO Require !(perm & BLK_PERM_CONSISTENT_READ), too? */ - if (shared & BLK_PERM_WRITE) { - shared =3D BLK_PERM_WRITE | BLK_PERM_RESIZE; - } else { - shared =3D 0; - } - - shared |=3D BLK_PERM_CONSISTENT_READ | BLK_PERM_GRAPH_MOD | - BLK_PERM_WRITE_UNCHANGED; - - if (bs->open_flags & BDRV_O_INACTIVE) { - shared |=3D BLK_PERM_WRITE | BLK_PERM_RESIZE; - } - - *nperm =3D perm; - *nshared =3D shared; + bdrv_default_perms_for_backing(bs, c, child_class, role, reopen_qu= eue, + perm, shared, nperm, nshared); } } =20 --=20 2.24.1