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Thu, 24 Jun 2021 08:30:16 +0000 (UTC) Received: from imap.suse.de (imap-alt.suse-dmz.suse.de [192.168.254.47]) (using TLSv1.2 with cipher ECDHE-ECDSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp-out2.suse.de (Postfix) with ESMTPS id B3F0B1FD67; Thu, 24 Jun 2021 08:30:15 +0000 (UTC) Received: from imap3-int (imap-alt.suse-dmz.suse.de [192.168.254.47]) by imap.suse.de (Postfix) with ESMTP id 7F36D11A97; Thu, 24 Jun 2021 08:30:15 +0000 (UTC) Received: from director2.suse.de ([192.168.254.72]) by imap3-int with ESMTPSA id IFrsHZdC1GBBIgAALh3uQQ (envelope-from ); Thu, 24 Jun 2021 08:30:15 +0000 X-BeenThere: xen-devel@lists.xenproject.org List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Precedence: list Sender: "Xen-devel" X-Inumbo-ID: 915b0a1b-cb7c-4b9d-90d0-5d2b542b89a5 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1624523415; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=mK3FUXG2k5/h1Ahqklaxt7B6min4oXXkJXXL4DaF10g=; b=u3gbljfv4eIhcBpXB5k7yK55P0cm0staXFWCHluX16e/QV8MidS3FI+gdIJZzDk63HZonI nzjdr4yO5lhk4AWxjofHwuCBXjc0TPQCw9UZqZLYiTAwd44YzyaYvAi87MS97uBfb8T5t8 LLTxtjTyE33wTV4Az8VyliJftQISG28= DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1624523415; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=mK3FUXG2k5/h1Ahqklaxt7B6min4oXXkJXXL4DaF10g=; b=u3gbljfv4eIhcBpXB5k7yK55P0cm0staXFWCHluX16e/QV8MidS3FI+gdIJZzDk63HZonI nzjdr4yO5lhk4AWxjofHwuCBXjc0TPQCw9UZqZLYiTAwd44YzyaYvAi87MS97uBfb8T5t8 LLTxtjTyE33wTV4Az8VyliJftQISG28= To: Julien Grall , xen-devel@lists.xenproject.org Cc: raphning@amazon.co.uk, doebel@amazon.de, Julien Grall , Ian Jackson , Wei Liu References: <20210616144324.31652-1-julien@xen.org> <20210616144324.31652-9-julien@xen.org> From: Juergen Gross Subject: Re: [PATCH 08/10] tools/xenstored: Extend restore code to handle multiple input buffer Message-ID: <444688a1-180f-7cf3-3461-0001030471d4@suse.com> Date: Thu, 24 Jun 2021 10:30:15 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.10.0 MIME-Version: 1.0 In-Reply-To: <20210616144324.31652-9-julien@xen.org> Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="g1GiBB6Hcv0S5hn0ktPZTtaOMSCx4n5CS" This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --g1GiBB6Hcv0S5hn0ktPZTtaOMSCx4n5CS Content-Type: multipart/mixed; boundary="K1xUIfxrSeaTfzDNUDS9TfUbD14ptiP5m"; protected-headers="v1" From: Juergen Gross To: Julien Grall , xen-devel@lists.xenproject.org Cc: raphning@amazon.co.uk, doebel@amazon.de, Julien Grall , Ian Jackson , Wei Liu Message-ID: <444688a1-180f-7cf3-3461-0001030471d4@suse.com> Subject: Re: [PATCH 08/10] tools/xenstored: Extend restore code to handle multiple input buffer References: <20210616144324.31652-1-julien@xen.org> <20210616144324.31652-9-julien@xen.org> In-Reply-To: <20210616144324.31652-9-julien@xen.org> --K1xUIfxrSeaTfzDNUDS9TfUbD14ptiP5m Content-Type: multipart/mixed; boundary="------------70D5279AF8A9D003712F5512" Content-Language: en-US This is a multi-part message in MIME format. --------------70D5279AF8A9D003712F5512 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: quoted-printable On 16.06.21 16:43, Julien Grall wrote: > From: Julien Grall >=20 > Currently, the restore code is considering the stream will contain at > most one in-flight request per connection. In a follow-up changes, we > will want to transfer multiple in-flight requests. >=20 > The function read_state_buffered() is now extended to restore multiple > in-flight request. Complete requests will be queued as delayed > requests, if there a partial request (only the last one can) then it > will used as the current in-flight request. >=20 > Note that we want to bypass the quota check for delayed requests as > the new Xenstore may have a lower limit. >=20 > Lastly, there is no need to change the specification as there was > no restriction on the number of in-flight requests preserved. >=20 > Signed-off-by: Julien Grall > --- > tools/xenstore/xenstored_core.c | 56 ++++++++++++++++++++++++++++----= - > 1 file changed, 48 insertions(+), 8 deletions(-) >=20 > diff --git a/tools/xenstore/xenstored_core.c b/tools/xenstore/xenstored= _core.c > index a5084a5b173d..5b7ab7f74013 100644 > --- a/tools/xenstore/xenstored_core.c > +++ b/tools/xenstore/xenstored_core.c > @@ -1486,6 +1486,10 @@ static void process_message(struct connection *c= onn, struct buffered_data *in) > enum xsd_sockmsg_type type =3D in->hdr.msg.type; > int ret; > =20 > + /* At least send_error() and send_reply() expects conn->in =3D=3D in = */ > + assert(conn->in =3D=3D in); > + trace_io(conn, in, 0); > + > if ((unsigned int)type >=3D XS_TYPE_COUNT || !wire_funcs[type].func)=20 { > eprintf("Client unknown operation %i", type); > send_error(conn, ENOSYS); > @@ -1515,6 +1519,23 @@ static void process_message(struct connection *c= onn, struct buffered_data *in) > conn->transaction =3D NULL; > } > =20 > +static bool process_delayed_message(struct delayed_request *req) > +{ > + struct connection *conn =3D req->data; > + struct buffered_data *saved_in =3D conn->in; > + > + /* > + * Part of process_message() expects conn->in to contains the > + * processed response. So save the current conn->in and restore it > + * afterwards. > + */ > + conn->in =3D req->in; > + process_message(req->data, req->in); > + conn->in =3D saved_in; This pattern was added to do_lu_start() already, and it will be needed for each other function being called via call_delayed(). Maybe it would be better to add conn explicitly to struct delayed_request (or even better: replace data with conn) and to do the conn->in saving/setting/restoring in call_delayed() instead? 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