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Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.11.0 MIME-Version: 1.0 In-Reply-To: <1602524605-481160-9-git-send-email-andrey.shinkevich@virtuozzo.com> X-Scanned-By: MIMEDefang 2.84 on 10.5.11.23 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=mreitz@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="wIkYO5ypS0fwJMz0rknKmunR5PgnTOJTS" Received-SPF: pass client-ip=216.205.24.124; envelope-from=mreitz@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/10/14 01:12:43 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] 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, NICE_REPLY_A=-0.001, 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 autolearn=unavailable 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: kwolf@redhat.com, fam@euphon.net, vsementsov@virtuozzo.com, libvir-list@redhat.com, qemu-devel@nongnu.org, armbru@redhat.com, stefanha@redhat.com, den@openvz.org, jsnow@redhat.com 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) --wIkYO5ypS0fwJMz0rknKmunR5PgnTOJTS Content-Type: multipart/mixed; boundary="LmTMuJAXCTNYwHUKDuVyXKvTfbEdLrzkF" --LmTMuJAXCTNYwHUKDuVyXKvTfbEdLrzkF Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: quoted-printable On 12.10.20 19:43, Andrey Shinkevich wrote: > Add support for the BDRV_REQ_PREFETCH flag to the supported_write_flags s/write/read/ > of the COR-filter. >=20 > Signed-off-by: Andrey Shinkevich > --- > block/copy-on-read.c | 1 + > 1 file changed, 1 insertion(+) >=20 > diff --git a/block/copy-on-read.c b/block/copy-on-read.c > index dfbd6ad..b136895 100644 > --- a/block/copy-on-read.c > +++ b/block/copy-on-read.c > @@ -50,6 +50,7 @@ static int cor_open(BlockDriverState *bs, QDict *option= s, int flags, > return -EINVAL; > } > =20 > + bs->supported_read_flags =3D BDRV_REQ_PREFETCH; > bs->supported_write_flags =3D BDRV_REQ_WRITE_UNCHANGED | > (BDRV_REQ_FUA & bs->file->bs->supported_write_flags); Then we mustn=E2=80=99t let cor_co_preadv_part() pass the flag on to bdrv_co_preadv_part() unless BDRV_REQ_COPY_ON_READ is set, too. I suspect the following patch is going to do that, but in the meantime the code is wrong. Perhaps just swap both patches? And by the way, I=E2=80=99m also missing a patch that makes the block layer evaluate supported_read_flags and e.g. strip BDRV_REQ_PREFETCH if it isn=E2=80=99t supported, before it gets passed to such a block driver. Max --LmTMuJAXCTNYwHUKDuVyXKvTfbEdLrzkF-- --wIkYO5ypS0fwJMz0rknKmunR5PgnTOJTS Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- iQEzBAEBCAAdFiEEkb62CjDbPohX0Rgp9AfbAGHVz0AFAl+G8bQACgkQ9AfbAGHV z0APvgf9GEFngSS1GzYwGcNCWmexO/jji88uuYgDwvfTHb8jN76QJbLiz09qsLmk yHGxvGoO2NAxLbX21sC3/QPcHuqWEM+eIbN1Oi2u30vzew+tNQZ/v+RvFZvmUWxw rMa97JYTZXpGXqvyAU3QHpVDVCFyuGLCEVahDEKX8AiUcUHtV+GGUuPw57OepLPZ /bmgV47VKuT2HR+lo/43ezTdI2KIDryO87/x6nDT0UtKBTQdkTLkE6r8KOA8/1AS 89PAAHYOvIp3LbQKhHpxoUHz1UHaun0rl5cXEjYXWQyQT59AHi13po3ApzPykR3F y3d9cPZD00pZYbvsWBFYdXH86RzI/w== =O7NZ -----END PGP SIGNATURE----- --wIkYO5ypS0fwJMz0rknKmunR5PgnTOJTS--