Messages in this thread | | | Subject | Re: tcp_sendpage and page allocation lifetime vs. iscsi | From | Dmitry Yusupov <> | Date | Fri, 29 Apr 2005 10:09:02 -0700 |
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On Mon, 2005-04-25 at 15:08 -0700, David S. Miller wrote: > On Tue, 26 Apr 2005 00:06:03 +0200 > Olivier Galibert <galibert@pobox.com> wrote: > > > Do you think possible to extent the sendpage api to add some kind of > > "don't get the pages, copy them if you need them" flag? > > No, not really. > > Do you happen to run the scsi->done() function from iscsi > as soon as the write over the TCP socket completes returns > success? That is likely what is causing the problem.
Your guess is correct. If this happen Olivier will see corruption sooner or later. But this should never happen, unless we have a subtle bug in iscsi_tcp.c which needs to be verified and fixed.
Since SCSI tape device usually causing a lot of sense data, we probably have a bug around sense data path processing. And this is not related to TCP API abuse in anyway. I would recommend to continue this discussion on www.open-iscsi.org mailing list.
Dima
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