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Mon, 31 Oct 2022 14:52:59 -0400 Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-471-Pz3aAVcxPM6jjf5bzcoBqQ-1; Mon, 31 Oct 2022 14:52:56 -0400 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.rdu2.redhat.com [10.11.54.1]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id E09A1101A528; Mon, 31 Oct 2022 18:52:55 +0000 (UTC) Received: from localhost (unknown [10.39.192.75]) by smtp.corp.redhat.com (Postfix) with ESMTP id 4782B40C2089; Mon, 31 Oct 2022 18:52:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1667242377; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=CQlhnItX9YyJv1NaFthXUfWY9srsADrlsPISjWkQdzc=; b=akoiEZQuYpxH9MkxzNlwalOz+2QUGUV48HKiLMdPIbakFXxONFRJq9xK04YIko9pjUuJ1J pDi2+Lc+IPSy1jsPL1NykXyUwj5icEr6NgoUuQHr1IvaGftZ+4zbiAn9at1WaXiRhV4rcD WElnuygtnX7qaOO7r2GcCWx7YnOvpjo= X-MC-Unique: Pz3aAVcxPM6jjf5bzcoBqQ-1 From: Stefan Hajnoczi To: qemu-devel@nongnu.org Cc: Eric Blake , Hanna Reitz , Stefan Hajnoczi , Markus Armbruster , qemu-block@nongnu.org, Kevin Wolf , Alberto Faria Subject: [PULL 2/3] block/blkio: Tolerate device size changes Date: Mon, 31 Oct 2022 14:51:05 -0400 Message-Id: <20221031185106.28245-3-stefanha@redhat.com> In-Reply-To: <20221031185106.28245-1-stefanha@redhat.com> References: <20221031185106.28245-1-stefanha@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.1 on 10.11.54.1 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+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=170.10.129.124; envelope-from=stefanha@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -37 X-Spam_score: -3.8 X-Spam_bar: --- X-Spam_report: (-3.8 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-1.048, 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_H2=-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: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "Qemu-devel" Errors-To: qemu-devel-bounces+importer=patchew.org+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1667242516530100003 Content-Type: text/plain; charset="utf-8" From: Alberto Faria Some libblkio drivers may be able to work with regular files (e.g., io_uring) or otherwise resizable devices. Conservatively set BlockDriver::has_variable_length to true to ensure bdrv_nb_sectors() always gives up-to-date results. Also implement BlockDriver::bdrv_co_truncate for the case where no preallocation is needed and the device already has a size compatible with what was requested. Signed-off-by: Alberto Faria Message-id: 20221029122031.975273-1-afaria@redhat.com Signed-off-by: Stefan Hajnoczi --- block/blkio.c | 27 +++++++++++++++++++++++++++ 1 file changed, 27 insertions(+) diff --git a/block/blkio.c b/block/blkio.c index f55eb774b4..d850506acd 100644 --- a/block/blkio.c +++ b/block/blkio.c @@ -848,6 +848,31 @@ static int64_t blkio_getlength(BlockDriverState *bs) return capacity; } =20 +static int coroutine_fn blkio_truncate(BlockDriverState *bs, int64_t offse= t, + bool exact, PreallocMode prealloc, + BdrvRequestFlags flags, Error **err= p) +{ + int64_t current_length; + + if (prealloc !=3D PREALLOC_MODE_OFF) { + error_setg(errp, "Unsupported preallocation mode '%s'", + PreallocMode_str(prealloc)); + return -ENOTSUP; + } + + current_length =3D blkio_getlength(bs); + + if (offset > current_length) { + error_setg(errp, "Cannot grow device"); + return -EINVAL; + } else if (exact && offset !=3D current_length) { + error_setg(errp, "Cannot resize device"); + return -ENOTSUP; + } + + return 0; +} + static int blkio_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) { return 0; @@ -963,10 +988,12 @@ static void blkio_refresh_limits(BlockDriverState *bs= , Error **errp) { \ .format_name =3D name, \ .protocol_name =3D name, \ + .has_variable_length =3D true, \ .instance_size =3D sizeof(BDRVBlkioState), \ .bdrv_file_open =3D blkio_file_open, \ .bdrv_close =3D blkio_close, \ .bdrv_getlength =3D blkio_getlength, \ + .bdrv_co_truncate =3D blkio_truncate, \ .bdrv_get_info =3D blkio_get_info, \ .bdrv_attach_aio_context =3D blkio_attach_aio_context, \ .bdrv_detach_aio_context =3D blkio_detach_aio_context, \ --=20 2.38.1