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Wed, 26 Jul 2023 00:48:10 -0700 (PDT) From: Stefano Garzarella To: qemu-devel@nongnu.org Cc: Hanna Reitz , qemu-block@nongnu.org, Kevin Wolf , Stefan Hajnoczi , berrange@redhat.com, Stefano Garzarella , Qing Wang Subject: [PATCH v2] block/blkio: do not use open flags in qemu_open() Date: Wed, 26 Jul 2023 09:48:07 +0200 Message-ID: <20230726074807.14041-1-sgarzare@redhat.com> X-Mailer: git-send-email 2.41.0 MIME-Version: 1.0 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=170.10.133.124; envelope-from=sgarzare@redhat.com; helo=us-smtp-delivery-124.mimecast.com 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_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 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: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1690357729237100001 Content-Type: text/plain; charset="utf-8" qemu_open() in blkio_virtio_blk_common_open() is used to open the character device (e.g. /dev/vhost-vdpa-0 or /dev/vfio/vfio) or in the future eventually the unix socket. In all these cases we cannot open the path in read-only mode, when the `read-only` option of blockdev is on, because the exchange of IOCTL commands for example will fail. In order to open the device read-only, we have to use the `read-only` property of the libblkio driver as we already do in blkio_file_open(). Fixes: cad2ccc395 ("block/blkio: use qemu_open() to support fd passing for = virtio-blk") Buglink: https://bugzilla.redhat.com/show_bug.cgi?id=3D2225439 Reported-by: Qing Wang Signed-off-by: Stefano Garzarella Reviewed-by: Daniel P. Berrang=C3=A9 --- Notes: v2: - added comment on top of qemu_open() [Daniel] =20 v1: https://lore.kernel.org/qemu-devel/20230725111155.85426-1-sgarzare@= redhat.com/ block/blkio.c | 21 ++++++++++++--------- 1 file changed, 12 insertions(+), 9 deletions(-) diff --git a/block/blkio.c b/block/blkio.c index 1798648134..cd6d2e55e7 100644 --- a/block/blkio.c +++ b/block/blkio.c @@ -686,15 +686,18 @@ static int blkio_virtio_blk_common_open(BlockDriverSt= ate *bs, * layer through the "/dev/fdset/N" special path. */ if (fd_supported) { - int open_flags; - - if (flags & BDRV_O_RDWR) { - open_flags =3D O_RDWR; - } else { - open_flags =3D O_RDONLY; - } - - fd =3D qemu_open(path, open_flags, errp); + /* + * `path` can contain the path of a character device + * (e.g. /dev/vhost-vdpa-0 or /dev/vfio/vfio) or a unix socket. + * + * So, we should always open it with O_RDWR flag, also if BDRV_O_R= DWR + * is not set in the open flags, because the exchange of IOCTL com= mands + * for example will fail. + * + * In order to open the device read-only, we are using the `read-o= nly` + * property of the libblkio driver in blkio_file_open(). + */ + fd =3D qemu_open(path, O_RDWR, errp); if (fd < 0) { return -EINVAL; } --=20 2.41.0