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Mon, 17 Aug 2020 14:49:27 +0000 (UTC) Subject: Re: [RFC PATCH 13/22] block/export: Move refcount from NBDExport to BlockExport To: Kevin Wolf , qemu-block@nongnu.org References: <20200813162935.210070-1-kwolf@redhat.com> <20200813162935.210070-14-kwolf@redhat.com> From: Max Reitz Autocrypt: addr=mreitz@redhat.com; prefer-encrypt=mutual; keydata= mQENBFXOJlcBCADEyyhOTsoa/2ujoTRAJj4MKA21dkxxELVj3cuILpLTmtachWj7QW+TVG8U /PsMCFbpwsQR7oEy8eHHZwuGQsNpEtNC2G/L8Yka0BIBzv7dEgrPzIu+W3anZXQW4702+uES U29G8TP/NGfXRRHGlbBIH9KNUnOSUD2vRtpOLXkWsV5CN6vQFYgQfFvmp5ZpPeUe6xNplu8V mcTw8OSEDW/ZnxJc8TekCKZSpdzYoxfzjm7xGmZqB18VFwgJZlIibt1HE0EB4w5GsD7x5ekh awIe3RwoZgZDLQMdOitJ1tUc8aqaxvgA4tz6J6st8D8pS//m1gAoYJWGwwIVj1DjTYLtABEB AAG0HU1heCBSZWl0eiA8bXJlaXR6QHJlZGhhdC5jb20+iQFTBBMBCAA9AhsDBQkSzAMABQsJ CAcCBhUICQoLAgQWAgMBAh4BAheABQJVzie5FRhoa3A6Ly9rZXlzLmdudXBnLm5ldAAKCRD0 B9sAYdXPQDcIB/9uNkbYEex1rHKz3mr12uxYMwLOOFY9fstP5aoVJQ1nWQVB6m2cfKGdcRe1 2/nFaHSNAzT0NnKz2MjhZVmcrpyd2Gp2QyISCfb1FbT82GMtXFj1wiHmPb3CixYmWGQUUh+I AvUqsevLA+WihgBUyaJq/vuDVM1/K9Un+w+Tz5vpeMidlIsTYhcsMhn0L9wlCjoucljvbDy/ 8C9L2DUdgi3XTa0ORKeflUhdL4gucWoAMrKX2nmPjBMKLgU7WLBc8AtV+84b9OWFML6NEyo4 4cP7cM/07VlJK53pqNg5cHtnWwjHcbpGkQvx6RUx6F1My3y52vM24rNUA3+ligVEgPYBuQEN BFXOJlcBCADAmcVUNTWT6yLWQHvxZ0o47KCP8OcLqD+67T0RCe6d0LP8GsWtrJdeDIQk+T+F xO7DolQPS6iQ6Ak2/lJaPX8L0BkEAiMuLCKFU6Bn3lFOkrQeKp3u05wCSV1iKnhg0UPji9V2 W5eNfy8F4ZQHpeGUGy+liGXlxqkeRVhLyevUqfU0WgNqAJpfhHSGpBgihUupmyUg7lfUPeRM DzAN1pIqoFuxnN+BRHdAecpsLcbR8sQddXmDg9BpSKozO/JyBmaS1RlquI8HERQoe6EynJhd 64aICHDfj61rp+/0jTIcevxIIAzW70IadoS/y3DVIkuhncgDBvGbF3aBtjrJVP+5ABEBAAGJ ASUEGAEIAA8FAlXOJlcCGwwFCRLMAwAACgkQ9AfbAGHVz0CbFwf9F/PXxQR9i4N0iipISYjU sxVdjJOM2TMut+ZZcQ6NSMvhZ0ogQxJ+iEQ5OjnIputKvPVd5U7WRh+4lF1lB/NQGrGZQ1ic alkj6ocscQyFwfib+xIe9w8TG1CVGkII7+TbS5pXHRxZH1niaRpoi/hYtgzkuOPp35jJyqT/ /ELbqQTDAWcqtJhzxKLE/ugcOMK520dJDeb6x2xVES+S5LXby0D4juZlvUj+1fwZu+7Io5+B bkhSVPb/QdOVTpnz7zWNyNw+OONo1aBUKkhq2UIByYXgORPFnbfMY7QWHcjpBVw9MgC4tGeF R4bv+1nAMMxKmb5VvQCExr0eFhJUAHAhVg== Message-ID: <5ddfd71a-fcb5-cfdc-1adb-5715188b8e44@redhat.com> Date: Mon, 17 Aug 2020 16:49:26 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: <20200813162935.210070-14-kwolf@redhat.com> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.13 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=mreitz@redhat.com X-Mimecast-Spam-Score: 0.0 X-Mimecast-Originator: redhat.com Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="f4RCuWaB0ZuOmCYxxZA1eDv7gzDTV1H4o" 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 = 2020/08/17 05:13:21 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -30 X-Spam_score: -3.1 X-Spam_bar: --- X-Spam_report: (-3.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-1, 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_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, 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: qemu-devel@nongnu.org Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --f4RCuWaB0ZuOmCYxxZA1eDv7gzDTV1H4o Content-Type: multipart/mixed; boundary="zI1m8zvY6C2QjiagS2ls2Aix4Ew6qnrRJ" --zI1m8zvY6C2QjiagS2ls2Aix4Ew6qnrRJ Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: quoted-printable On 13.08.20 18:29, Kevin Wolf wrote: > Having a refcount makes sense for all types of block exports. It is also > a prerequisite for keeping a list of all exports at the BlockExport > level. >=20 > Signed-off-by: Kevin Wolf > --- > include/block/export.h | 10 ++++++ > include/block/nbd.h | 2 -- > block/export/export.c | 14 ++++++++ > blockdev-nbd.c | 2 +- > nbd/server.c | 72 +++++++++++++++++++----------------------- > 5 files changed, 58 insertions(+), 42 deletions(-) [...] > diff --git a/blockdev-nbd.c b/blockdev-nbd.c > index 8dd127af52..a8b7b785e7 100644 > --- a/blockdev-nbd.c > +++ b/blockdev-nbd.c > @@ -232,7 +232,7 @@ BlockExport *nbd_export_create(BlockExportOptions *ex= p_args, Error **errp) > /* The list of named exports has a strong reference to this export n= ow and > * our only way of accessing it is through nbd_export_find(), so we = can drop > * the strong reference that is @exp. */ > - nbd_export_put(exp); > + blk_exp_unref((BlockExport*) exp); :/ Less so because of the asterisk, but more so because of =E2=80=9Canother instance of a cast because we can=E2=80=99t access a BlockExport=E2=80=99s = fields. > out: > aio_context_release(aio_context); > diff --git a/nbd/server.c b/nbd/server.c > index 4c594e6558..2bf30bb731 100644 > --- a/nbd/server.c > +++ b/nbd/server.c [...] > @@ -1537,7 +1536,8 @@ NBDExport *nbd_export_new(BlockDriverState *bs, > =20 > exp =3D g_new0(NBDExport, 1); > exp->common =3D (BlockExport) { > - .drv =3D &blk_exp_nbd, > + .drv =3D &blk_exp_nbd, > + .refcount =3D 1, > }; This makes me wish... Ah, for patch 16, I see. :) Reviewed-by: Max Reitz --zI1m8zvY6C2QjiagS2ls2Aix4Ew6qnrRJ-- --f4RCuWaB0ZuOmCYxxZA1eDv7gzDTV1H4o Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- iQEzBAEBCAAdFiEEkb62CjDbPohX0Rgp9AfbAGHVz0AFAl86mPYACgkQ9AfbAGHV z0BJdQgArMhQ97iyCKLT65PlIigfyeUan/HD7TdQBSBMLYAtsCE4SArl6npUcC3D h7EPHEAKxINq+NKwFKdsfnrqSEWIJd5CUg9cxEUTCcgk0EJaC+Qlo1y3/KJyn8K5 wZQA0lWpjECdMA6tBvv+gOkWHKHpTgMiPw6IubYKNaETbQ+PypWsz82WIj8HScmj 97NmA+OlPZbN009DZxJyHg81lKXBme+ds1nUtY6WMxAzTTjzN6g8DSU/wg2YcxRp gai2/vry82X3OBEkj4iDUBsEPUDu81hk+ZWvYPfbvZKY16qnnSn5UNuyqb6gUcgo UDHfOJqSeCo3f4EOKj+8KEkVkqMC8A== =/jyl -----END PGP SIGNATURE----- --f4RCuWaB0ZuOmCYxxZA1eDv7gzDTV1H4o--