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Date:      Tue, 15 Mar 2016 18:02:59 +0100
From:      =?UTF-8?Q?Gustau_P=c3=a9rez?= <gustau.perez@gmail.com>
To:        FreeBSD XEN <freebsd-xen@freebsd.org>
Subject:   Re: Porting the block-iscsi hotplug script
Message-ID:  <56E84043.4060602@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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> Linux already has some code to do this checking, but this also involves 
> taking a lock in order to make sure there's only one hotplug script 
> performing this check at the same time.
>
> The Linux function that performs this checking is in:
>
> http://xenbits.xen.org/gitweb/?p=xen.git;a=blob;f=tools/hotplug/Linux/block;h=2691b56951c9b82094471a141b9e0bed04abb929;hb=HEAD#l40
>
> And the caller is:
>
> http://xenbits.xen.org/gitweb/?p=xen.git;a=blob;f=tools/hotplug/Linux/block;h=2691b56951c9b82094471a141b9e0bed04abb929;hb=HEAD#l275
>
> If you take a look, the call to check_device_sharing is protected with the 
> "block" lock.
>


  Hi,

  finally $WORK gave me a few time to spend and I managed to have
something that works with 'sh' (ash). It'd need some comments here and
there, but it works. I'll post the scripts somewhere when I got time, or
would you prefer diff?

  Next step would be to deal with HVM domains and qemu, right?

  Gustau



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