Date: Tue, 8 Mar 2016 17:44:24 +0100 From: =?UTF-8?Q?Gustau_P=c3=a9rez?= <gustau.perez@gmail.com> To: =?UTF-8?Q?Roger_Pau_Monn=c3=a9?= <roger.pau@citrix.com> Cc: FreeBSD XEN <freebsd-xen@freebsd.org> Subject: Re: Porting the block-iscsi hotplug script Message-ID: <56DF0168.4010300@gmail.com> In-Reply-To: <alpine.OSX.2.20.1603041647160.22025@mac> 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> <alpine.OSX.2.20.1603041055250.20397@mac> <56D97762.7000908@gmail.com> <alpine.OSX.2.20.1603041647160.22025@mac>
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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
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