Thank you both very much for the advice and direction on this. Avoiding the research and effort we might have spent on this dubious task is invaluable! -Chris -----Original Message----- From: ronnie sahlberg [mailto:ronniesahlberg@xxxxxxxxx] Sent: October 19, 2017 2:50 AM To: Aurélien Aptel <aaptel@xxxxxxxx> Cc: Chris Davies <chris.davies@xxxxxxxxx>; linux-cifs@xxxxxxxxxxxxxxx Subject: Re: CIFS backporting for kernel 2.6, SMB2/3 dialect support Concur with Aurélien. 2.6.32 is VERY old and there are several core kernel APIs that have changed significantly between 2.6 and current kernels. For example the whole iovector API for how buffers are handled changed dramatically. And there are other dramatic API changes too. As a lot of distros do ship "old-ish" (but not as old as 2.6) kernels but with modern CIFS, it is not impossible but it is far far from being trivial. Especially since 2.6.32 is so old that you will have to write a whole bunch of translation wrappers to accomodate the kernel API changes that cifs.ko need to interface to. Unless you are willing to dedicate resources to a big port, and continued support, It is possible but will require significant effort and likely significant cost, both to backport it as well as supporting it. I would just stick with 2.6.32 and SMB1 for now until you get to the point where you can upgrade the whole distro/kernel to a more recent varient. regards ronnie sahlberg On Thu, Oct 19, 2017 at 7:09 PM, Aurélien Aptel <aaptel@xxxxxxxx> wrote: > Hi Chris, > > Chris Davies <chris.davies@xxxxxxxxx> writes: >> Hi folks, I'm hoping to achieve SMB2.0+ dialect support for CentOS 6 clients (currently with CIFS 1.68). Has anyone done a backport of newer CIFS versions for use in production? Was it trivial? > > According to wikipedia CenOS 6 is based on kernel 2.6.32. This is > *old*. Adding SMBv2 support required large refactoring efforts and > kernel APIs are often changing so I expect backporting to be very hard > unfortunately. > > Cheers, > > -- > Aurélien Aptel / SUSE Labs Samba Team > GPG: 1839 CB5F 9F5B FB9B AA97 8C99 03C8 A49B 521B D5D3 SUSE Linux > GmbH, Maxfeldstraße 5, 90409 Nürnberg, Germany > GF: Felix Imendörffer, Jane Smithard, Graham Norton, HRB 21284 (AG > Nürnberg) > -- > To unsubscribe from this list: send the line "unsubscribe linux-cifs" > in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo > info at http://vger.kernel.org/majordomo-info.html ��.n��������+%������w��{.n�����{�����ܨ}���Ơz�j:+v�����w����ޙ��&�)ߡ�a����z�ޗ���ݢj��w�f
