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Wed, 13 May 2020 07:06:29 -0400 Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-448-7PKNHN-5NfOiLF8UNjWm5g-1; Wed, 13 May 2020 07:06:26 -0400 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.phx2.redhat.com [10.5.11.16]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 7BE0019200C2; Wed, 13 May 2020 11:06:25 +0000 (UTC) Received: from localhost (unknown [10.40.193.218]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 135905C1C3; Wed, 13 May 2020 11:06:24 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1589367988; 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=k68u1Za7iA4GLoZz/RT9eaWrdNEzjmE5mbKppChZ1XA=; b=bK7WKx9nJRtkW41ZKyHVOU89eZ88tgM10SWHV92t+OMlDeBTh6YSSmEPrYx9r8C9sHG3XJ 06lxtis0IUW3yBOa7cXCGmFoiHQWuelM+NxUC3OPEbEQyBApylApRy8/u8aGG7wrzejkMc 9yOe68PmuUSwwnTWaqXo6eP1uNjPUug= X-MC-Unique: 7PKNHN-5NfOiLF8UNjWm5g-1 From: Max Reitz To: qemu-block@nongnu.org Subject: [PATCH v4 14/34] block: Add child_of_bds Date: Wed, 13 May 2020 13:05:24 +0200 Message-Id: <20200513110544.176672-15-mreitz@redhat.com> In-Reply-To: <20200513110544.176672-1-mreitz@redhat.com> References: <20200513110544.176672-1-mreitz@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 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; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=205.139.110.120; envelope-from=mreitz@redhat.com; helo=us-smtp-1.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/05/13 01:56:38 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H2=-0.001, SPF_PASS=-0.001 autolearn=_AUTOLEARN X-Spam_action: no action 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" Any current user of child_file, child_format, and child_backing can and should use this generic BdrvChildClass instead, as it can handle all of these cases. However, to be able to do so, the users must pass the appropriate BdrvChildRole when the child is created/attached. (The following commits will take care of that.) Signed-off-by: Max Reitz Reviewed-by: Eric Blake --- include/block/block_int.h | 1 + block.c | 24 ++++++++++++++++++++++++ 2 files changed, 25 insertions(+) diff --git a/include/block/block_int.h b/include/block/block_int.h index 6245d8a18d..54df821d61 100644 --- a/include/block/block_int.h +++ b/include/block/block_int.h @@ -740,6 +740,7 @@ struct BdrvChildClass { void (*set_aio_ctx)(BdrvChild *child, AioContext *ctx, GSList **ignore= ); }; =20 +extern const BdrvChildClass child_of_bds; extern const BdrvChildClass child_file; extern const BdrvChildClass child_format; extern const BdrvChildClass child_backing; diff --git a/block.c b/block.c index f63417c06d..be9bfa9d46 100644 --- a/block.c +++ b/block.c @@ -1429,6 +1429,30 @@ static void bdrv_child_cb_detach(BdrvChild *child) bdrv_unapply_subtree_drain(child, bs); } =20 +static int bdrv_child_cb_update_filename(BdrvChild *c, BlockDriverState *b= ase, + const char *filename, Error **err= p) +{ + if (c->role & BDRV_CHILD_COW) { + return bdrv_backing_update_filename(c, base, filename, errp); + } + return 0; +} + +const BdrvChildClass child_of_bds =3D { + .parent_is_bds =3D true, + .get_parent_desc =3D bdrv_child_get_parent_desc, + .inherit_options =3D bdrv_inherited_options, + .drained_begin =3D bdrv_child_cb_drained_begin, + .drained_poll =3D bdrv_child_cb_drained_poll, + .drained_end =3D bdrv_child_cb_drained_end, + .attach =3D bdrv_child_cb_attach, + .detach =3D bdrv_child_cb_detach, + .inactivate =3D bdrv_child_cb_inactivate, + .can_set_aio_ctx =3D bdrv_child_cb_can_set_aio_ctx, + .set_aio_ctx =3D bdrv_child_cb_set_aio_ctx, + .update_filename =3D bdrv_child_cb_update_filename, +}; + static int bdrv_open_flags(BlockDriverState *bs, int flags) { int open_flags =3D flags; --=20 2.26.2