From mboxrd@z Thu Jan 1 00:00:00 1970 From: Tomasz Chmielewski Subject: Re: btrfs not iSCSI-target safe? Date: Thu, 23 Jul 2009 18:50:53 +0200 Message-ID: <4A6894ED.6020701@wpkg.org> References: <20090722112706.GA7374@mother.pipebreaker.pl> <20090722144031.GC29886@think> <20090723132852.GA23960@mother.pipebreaker.pl> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Cc: linux-btrfs@vger.kernel.org To: Tomasz Torcz Return-path: In-Reply-To: <20090723132852.GA23960@mother.pipebreaker.pl> List-ID: 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]? From experience, I have to say iscsitarget has a couple of serious instability problems (at least it was the case about a year ago, could be that the things improved). [1] http://stgt.berlios.de [2] http://scst.sf.net -- Tomasz Chmielewski http://wpkg.org