Re: btrfs not iSCSI-target safe?

[Tomasz Torcz <tomek@pipebreaker.pl>]

On Thu, Jul 23, 2009 at 06:50:53PM +0200, Tomasz Chmielewski wrote:
> Tomasz Torcz wrote:
>> On Wed, Jul 22, 2009 at 10:40:31AM -0400, Chris Mason wrote:
>>> On Wed, Jul 22, 2009 at 01:27:06PM +0200, Tomasz Torcz wrote:
>>>>   Hi,
>>>>
>>>> I tried to export file from btrfs volume using iSCSI target.
>>>> As soon as some initiator have read it over network, server
>>>> oopsed: http://www.kerneloops.org/submitresult.php?number=557979
>>>>  Kernel is Fedora's 2.6.29.6-213.fc11.x86_64. I'm aware that
>>>> target iSCSI functionality is out-of-tree (I'm using iscsitarget-0.4.17-3),
>>>> so it may not be safe. But is there any known incompatibility
>>>> between iscsi-target and btrfs?
>>> Sorry, I don't know of any problems between btrfs and iscsi.  Is the
>>> iscsi target configured to use linux aio?  That could be the problem.
>>
>>   I'm not sure, I'm a mere user. This target software seems to read
>> files from kernelspace, which as I understand is frowned upon.
>>   If you are interested, sourcecode is at http://iscsitarget.sourceforge.net/
>> Ooops occured in fileio_make_request(), in iscsitarget-0.4.17/kernel/file-io.c
>> file.
>
> Have you tried other target implementations, for example tgt[1] or scst[2]?

  FTR: tgt works fine with btrfs. Using iscsitarget was a mistake, but it
was only hit in "yum search iscsi target". tgt package name in Fedora is
scsi-target-utils.

-- 
Tomasz Torcz                Only gods can safely risk perfection,
xmpp: zdzichubg@chrome.pl     it's a dangerous thing for a man.  -- Alia