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Wed, 27 Nov 2019 13:17:00 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1574860624; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=XiiSrurUJqp0clemN6Ew5qrgphB6yCujJ7gol3gizhU=; b=OxomSa6pXo6Hx9r2cKjR/izKl9/p4gTjRAmvsyLlmil87PtNGaKMAmsS2FcSbfrzxAeUCc TlUbwMor01vsmcDg2tz4oMBo1oJIq0f0lZdB0kr8IaasSkq8rr89G+DxY1pzFG/cblPMW4 K9T/aA3vjw9Yj2q/KKZrh6ehK7Pxt7s= From: Max Reitz To: qemu-block@nongnu.org Subject: [PATCH for-5.0 14/31] block: Pull out bdrv_default_perms_for_storage() Date: Wed, 27 Nov 2019 14:16:07 +0100 Message-Id: <20191127131624.1062403-15-mreitz@redhat.com> In-Reply-To: <20191127131624.1062403-1-mreitz@redhat.com> References: <20191127131624.1062403-1-mreitz@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 X-MC-Unique: 5UeQnlKBOt-akA6XkIY9RA-1 X-Mimecast-Spam-Score: 0 Content-Transfer-Encoding: quoted-printable X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] 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 , qemu-devel@nongnu.org, Max Reitz Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) Content-Type: text/plain; charset="utf-8" Signed-off-by: Max Reitz --- block.c | 71 +++++++++++++++++++++++++++++++++++++-------------------- 1 file changed, 46 insertions(+), 25 deletions(-) diff --git a/block.c b/block.c index 2771bc45ce..4d4ccbacdf 100644 --- a/block.c +++ b/block.c @@ -2294,6 +2294,50 @@ static void bdrv_default_perms_for_backing(BlockDriv= erState *bs, BdrvChild *c, *nshared =3D shared; } =20 +static void bdrv_default_perms_for_storage(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) +{ + int flags; + + assert(child_class =3D=3D &child_file || + (child_class =3D=3D &child_of_bds && + (role & (BDRV_CHILD_METADATA | BDRV_CHILD_DATA)))); + + flags =3D bdrv_reopen_get_flags(reopen_queue, bs); + + /* + * Apart from the modifications below, the same permissions are + * forwarded and left alone as for filters + */ + bdrv_filter_default_perms(bs, c, child_class, role, reopen_queue, + perm, shared, &perm, &shared); + + /* Format drivers may touch metadata even if the guest doesn't write */ + if (bdrv_is_writable_after_reopen(bs, reopen_queue)) { + perm |=3D BLK_PERM_WRITE | BLK_PERM_RESIZE; + } + + /* + * bs->file always needs to be consistent because of the metadata. We + * can never allow other users to resize or write to it. + */ + if (!(flags & BDRV_O_NO_IO)) { + perm |=3D BLK_PERM_CONSISTENT_READ; + } + shared &=3D ~(BLK_PERM_WRITE | BLK_PERM_RESIZE); + + 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, @@ -2305,31 +2349,8 @@ void bdrv_format_default_perms(BlockDriverState *bs,= BdrvChild *c, assert(child_class =3D=3D &child_backing || child_class =3D=3D &child_= file); =20 if (!backing) { - int flags =3D bdrv_reopen_get_flags(reopen_queue, bs); - - /* Apart from the modifications below, the same permissions are - * forwarded and left alone as for filters */ - bdrv_filter_default_perms(bs, c, child_class, role, reopen_queue, - perm, shared, &perm, &shared); - - /* Format drivers may touch metadata even if the guest doesn't wri= te */ - if (bdrv_is_writable_after_reopen(bs, reopen_queue)) { - perm |=3D BLK_PERM_WRITE | BLK_PERM_RESIZE; - } - - /* bs->file always needs to be consistent because of the metadata.= We - * can never allow other users to resize or write to it. */ - if (!(flags & BDRV_O_NO_IO)) { - perm |=3D BLK_PERM_CONSISTENT_READ; - } - shared &=3D ~(BLK_PERM_WRITE | BLK_PERM_RESIZE); - - 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_storage(bs, c, child_class, role, reopen_qu= eue, + perm, shared, nperm, nshared); } else { bdrv_default_perms_for_backing(bs, c, child_class, role, reopen_qu= eue, perm, shared, nperm, nshared); --=20 2.23.0