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Wed, 09 Jun 2021 12:30:49 -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-585-R-8rKcFbOwaygYIP1_PNNw-1; Wed, 09 Jun 2021 12:30:44 -0400 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.phx2.redhat.com [10.5.11.14]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 2D557101C8C1; Wed, 9 Jun 2021 16:30:43 +0000 (UTC) Received: from blue.redhat.com (ovpn-113-53.phx2.redhat.com [10.3.113.53]) by smtp.corp.redhat.com (Postfix) with ESMTP id 5A4A35D9F0; Wed, 9 Jun 2021 16:30:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1623256245; 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; bh=FJyGcqdv5LXNJoz6zz/tQAZ0DIzXYn0P4zoO/sbUmwY=; b=d081dr6vZUM90S8WIbvUp95aSvHRU85MsHw7HO/aynzm4SrK4C/Z4/9jZ1aO1QK6Jd2TZT G2JtI6slcTVFAM97cxmTdLVB29VseArGl/msMCROwKpikYWG1JbdvULiX4C4k04oDw+Dtr Ll0Obk8CGvOF+YdLjHr2C5WS37X7DT4= X-MC-Unique: R-8rKcFbOwaygYIP1_PNNw-1 From: Eric Blake To: qemu-devel@nongnu.org Subject: [PATCH] block: Move read-only check during truncation earlier Date: Wed, 9 Jun 2021 11:30:34 -0500 Message-Id: <20210609163034.997943-1-eblake@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=eblake@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; envelope-from=qemu-devel-bounces+importer2=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=216.205.24.124; envelope-from=eblake@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -29 X-Spam_score: -3.0 X-Spam_bar: --- X-Spam_report: (-3.0 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.199, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no 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: Fam Zheng , Kevin Wolf , "open list:Block I/O path" , Stefan Hajnoczi , Max Reitz Errors-To: qemu-devel-bounces+importer2=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) Content-Type: text/plain; charset="utf-8" No need to start a tracked request that will always fail. The choice to check read-only after bdrv_inc_in_flight() predates 1bc5f09f2e (block: Use tracked request for truncate), but waiting for serializing requests can make the effect more noticeable. Signed-off-by: Eric Blake Reviewed-by: Vladimir Sementsov-Ogievskiy --- block/io.c | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-) diff --git a/block/io.c b/block/io.c index 323854d06337..1a05f320d35e 100644 --- a/block/io.c +++ b/block/io.c @@ -3390,6 +3390,11 @@ int coroutine_fn bdrv_co_truncate(BdrvChild *child, = int64_t offset, bool exact, return old_size; } + if (bdrv_is_read_only(bs)) { + error_setg(errp, "Image is read-only"); + return -EACCES; + } + if (offset > old_size) { new_bytes =3D offset - old_size; } else { @@ -3406,11 +3411,6 @@ int coroutine_fn bdrv_co_truncate(BdrvChild *child, = int64_t offset, bool exact, if (new_bytes) { bdrv_make_request_serialising(&req, 1); } - if (bdrv_is_read_only(bs)) { - error_setg(errp, "Image is read-only"); - ret =3D -EACCES; - goto out; - } ret =3D bdrv_co_write_req_prepare(child, offset - new_bytes, new_bytes= , &req, 0); if (ret < 0) { --=20 2.31.1