From owner-freebsd-xen@freebsd.org Tue Mar 8 16:44:28 2016 Return-Path: Delivered-To: freebsd-xen@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id B739DAC8A39 for ; Tue, 8 Mar 2016 16:44:28 +0000 (UTC) (envelope-from gustau.perez@gmail.com) Received: from mail-wm0-x230.google.com (mail-wm0-x230.google.com [IPv6:2a00:1450:400c:c09::230]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (Client CN "smtp.gmail.com", Issuer "Google Internet Authority G2" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 59BDEFBB for ; Tue, 8 Mar 2016 16:44:28 +0000 (UTC) (envelope-from gustau.perez@gmail.com) Received: by mail-wm0-x230.google.com with SMTP id p65so35731425wmp.0 for ; Tue, 08 Mar 2016 08:44:28 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=subject:to:references:cc:from:message-id:date:user-agent :mime-version:in-reply-to:content-transfer-encoding; bh=muxhPnykz8sl4+ij34yFg/V5a6K9GVOGfx2afy797FQ=; b=iOtuAt5xr0vMXiDyiNPvaeEQEmJ4sSm1d47aUbRu3p4jE9fWkivOwdp6ZTPg1gT0iV urg/DcZo7kHnho/mM1kd6ek1O7qPuspT1aYYE+UyifUsgbEVT54Q4LlncPUAxhSlUnaN FqEjdbG77DskvvqEZWrDs/fwiWG+CtcdbnRnmAQAH8ub5N+R4ztjcTCPsr9PUrbDIyiv O9k5s0ggploTc8bjG/M2NZM76OdXvyBbgcNtCzyKsuO8OjzXsBgISbFxyYdlCgN9w5Zl 40Bc4MfERQ6JD+CEjkVom5OjegtDMLMWBf2xhfKA4gu70M8OVyobkFfl4fQFRj9KBQOe shKQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:subject:to:references:cc:from:message-id:date :user-agent:mime-version:in-reply-to:content-transfer-encoding; bh=muxhPnykz8sl4+ij34yFg/V5a6K9GVOGfx2afy797FQ=; b=GOP2OGnVulz/kIHq1MU+IdBdX3fZdPj9qD4BRollM/FREOkB94glybsTJuH/3mCUBi HvfEpks2NUiVVWodl6fSE1TTYuemqVtI7wUXzDkMNSPRa0Oz9s17kgsWu1zVFfalkY19 6VWiQul/HkRF10nKMkMDK337mIBU9UI+XcErvVLMK33qMnJb5K80VcU/ciCb2MjMIOmF zgI+fifJ2WeL2Gnp4Nmer2XZv5E1/kVrsQjbzxOZNGPJmZBKBsQxUTovupMuzO4wMiJA cUQ2Q2vOmV0ru0xHAqdvjFWjh4sjncLG1fYWM9HPFtJS6XPvd23J8KCjjGAaI4EOEqLm Nu2g== X-Gm-Message-State: AD7BkJIiunPVJ/Ha4cFR8F7ftwrcF87jTttZIDkdY36lLPFSM+5DA5YHyOBxqd6m0w7d4g== X-Received: by 10.194.115.132 with SMTP id jo4mr28876500wjb.156.1457455466572; Tue, 08 Mar 2016 08:44:26 -0800 (PST) Received: from [10.0.2.151] ([147.83.40.10]) by smtp.googlemail.com with ESMTPSA id x186sm19640897wmg.19.2016.03.08.08.44.25 (version=TLSv1/SSLv3 cipher=OTHER); Tue, 08 Mar 2016 08:44:25 -0800 (PST) Subject: Re: Porting the block-iscsi hotplug script To: =?UTF-8?Q?Roger_Pau_Monn=c3=a9?= References: <553DEB97.5000300@entel.upc.edu> <555EF542.3090002@citrix.com> <555F9B3F.1000600@entel.upc.edu> <55602512.1090702@citrix.com> <56C6FA2F.8040900@gmail.com> <56CAC8CB.8030107@gmail.com> <56CADEDA.4050007@citrix.com> <56CB0057.1060509@gmail.com> <56CB041E.1020009@citrix.com> <56CB2D90.5080809@gmail.com> <56CB34BA.6060809@citrix.com> <56CC24BD.6050609@gmail.com> <56CC32E5.5010101@citrix.com> <56CC7637.3080408@gmail.com> <56CF5668.6090605@citrix.com> <56D0091F.80408@gmail.com> <56D02863.7040100@citrix.com> <56D03D95.9090509@gmail.com> <56D04E5F.8070901@citrix.com> <56D42A28.8050701@gmail.com> <56D434FC.8030905@citrix.com> <56D57110.2060406@gmail.com> <56D587D8.6030702@citrix.com> <56D590EA.609@gmail.com> <56D591BA.4020303@gmail.com> <56D5929F.7040001@citrix.com> <56D5C722.3080205@gmail.com> <56D6B68D.8080809@citrix.com> <56D7FEFE.9050000@gmail.com> <56D97762.7000908@gmail.com> Cc: FreeBSD XEN From: =?UTF-8?Q?Gustau_P=c3=a9rez?= X-Enigmail-Draft-Status: N1110 Message-ID: <56DF0168.4010300@gmail.com> Date: Tue, 8 Mar 2016 17:44:24 +0100 User-Agent: Mozilla/5.0 (X11; FreeBSD amd64; rv:38.0) Gecko/20100101 Thunderbird/38.6.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit X-BeenThere: freebsd-xen@freebsd.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: Discussion of the freebsd port to xen - implementation and usage List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 08 Mar 2016 16:44:28 -0000 El 4/03/16 a les 16:54, Roger Pau Monné ha escrit: > On Fri, 4 Mar 2016, Gustau Pérez wrote: >> El 4/03/16 a les 11:00, Roger Pau Monné ha escrit: >>> What other parameters do you want to pass to your script that cannot be >>> fetched from xenstore? IMHO I was planning to only pass the xenstore >>> backend node and the action. >> The action (if I understand it correctly) is already there. > Yes, the xenstore backend path is $1 and the action $2. > >> OTOH, I'd like to check if the disks are already in use, and so I'd >> need to walk the /local/domain/0/backend/vbd/$domin/$devid/ looking if >> the disks are already there. This arises two questions: >> >> * can I assume the domain0 store would always be /local/domain/0/? > Hm, I wouldn't be on it. This is true in the most common scenario, where > Dom0 (domain with id 0) runs all the backends. But if you are using a > driver domain or a radically disagregated system (where control domain != > hardware domain) this is no longer true. So in general you shouldn't make > this assumption. > >> * would I need to walk for each $domid checking for each $devid and >> getting the physical device? Hi, today I had some time to work a bit the script. I managed to have something that works with plain 'sh' and seems to do its job. I need to split the script (for example, the xenstore_[read|write] functions can be used by other scripts) and I also need to tackle the locking functions, which are not 'sh' compliant. If you want I can post it somewhere. I make the assumption that domain0 can also be the dom0 domain. As you previously stated, in general this assumption should hold; given the fact that the domain ids are given sequentially in the worst case the dom0 would be > 0. This is used when checking if the disk is already in use, that way we can return the domid of the domain already using the device or 0 if the device can be used. Thank you, Gustau