How to compile ZFS only ?

[Ben RUBSON]

I'm not sure other modules are missing : my server correctly starts, I then only overwrite ZFS module (/boot/kernel/zfs.ko), I think it should then work.
But server hangs during startup, certainly because module compiled directly using make is different from the one built with make buildkernel (which works).
As says Xin below, some options from sys/*/conf/GENERIC may not be taken into account with the quick make method...

I'll try to give the faulty module a try on a non-zfs root machine.

The -DNO_CLEAN method is interesting if src tree has not been cleaned before :)
(I always do a make clean to leave the tree cleaned ^^)

So sounds like there is no solution but trying to speed-up a whole kernel build.

Thank you !

Ben

> On 23 Mar 2017, at 00:51, Steven Hartland <killing at multiplay.co.uk> wrote:
> 
> In addition to the main zfs module there are also dependency modules which are required.
> 
> If you're able to test loading the module on a non-zfs root machine by manually loading it, it should detail any issues in /var/log/messages.
> 
> That said the method listed by Xin is the quickest and easiest solution.
> 
> On Wed, 22 Mar 2017 at 22:43, Xin LI <delphij at gmail.com <mailto:delphij at gmail.com>> wrote:
> Why not just -DNO_CLEAN= with 'make buildkernel'?
> 
> But to answer your question, 'make buildkernel' will take e.g.
> 'KERNCONF' aka kernel build configuration into account, while if you
> do make directly, it's not (and sometimes build options in the kernel
> build configuration, like WITNESS, etc., have material impact to data
> structure layouts).
> 
> On Wed, Mar 22, 2017 at 2:47 PM, Ben RUBSON <ben.rubson at gmail.com <mailto:ben.rubson at gmail.com>> wrote:
> > Thank you for your answer Steven.
> > Unfortunately it did not help, same behaviour :
> > Module with you method has the same smaller size, 2323000 bytes vs 2500544.
> > (I then did not try to boot with it)
> >
> > Ben
> >
> >> On 22 Mar 2017, at 22:09, Steven Hartland <killing at multiplay.co.uk <mailto:killing at multiplay.co.uk>> wrote:
> >>
> >> cd /usr/src
> >> make buildenv
> >> cd sys/modules/zfs/
> >> make
> >> make install
> >>
> >> On 22/03/2017 20:57, Ben RUBSON wrote:
> >>> Hi,
> >>>
> >>> I'm trying to rebuild ZFS (with some patches) without having to rebuild whole kernel.
> >>>
> >>> What I then try :
> >>> # cd /usr/src/sys/modules/zfs/
> >>> # make
> >>> # cp zfs.ko /boot/kernel/ #to replace current zfs module
> >>>
> >>> But then server does not reboot properly (/ is on ZFS).
> >>>
> >>> If I do :
> >>> # cd /usr/src/
> >>> # make buildkernel KERNCONF=GENERIC
> >>> # cp /usr/obj/usr/src/sys/GENERIC/modules/usr/src/sys/modules/zfs/zfs.ko /boot/kernel/
> >>>
> >>> Then server correctly reboot.
> >>>
> >>> I clearly see that zfs.ko in method 1 is slightly smaller that in method 2.
> >>>
> >>> Am I missing something ? (of course yes, but what ? :)
> >>>
> >>> Many thanks !
> >>>
> >>> Best regards,
> >>>
> >>> Ben
> >>>
> >>> _______________________________________________
> >>> freebsd-fs at freebsd.org <mailto:freebsd-fs at freebsd.org> mailing list
> >>> https://lists.freebsd.org/mailman/listinfo/freebsd-fs <https://lists.freebsd.org/mailman/listinfo/freebsd-fs>
> >>> To unsubscribe, send any mail to "freebsd-fs-unsubscribe at freebsd.org <mailto:freebsd-fs-unsubscribe at freebsd.org>"
> >>
> >> _______________________________________________
> >> freebsd-fs at freebsd.org <mailto:freebsd-fs at freebsd.org> mailing list
> >> https://lists.freebsd.org/mailman/listinfo/freebsd-fs <https://lists.freebsd.org/mailman/listinfo/freebsd-fs>
> >> To unsubscribe, send any mail to "freebsd-fs-unsubscribe at freebsd.org <mailto:freebsd-fs-unsubscribe at freebsd.org>"
> >
> > _______________________________________________
> > freebsd-fs at freebsd.org <mailto:freebsd-fs at freebsd.org> mailing list
> > https://lists.freebsd.org/mailman/listinfo/freebsd-fs <https://lists.freebsd.org/mailman/listinfo/freebsd-fs>
> > To unsubscribe, send any mail to "freebsd-fs-unsubscribe at freebsd.org <mailto:freebsd-fs-unsubscribe at freebsd.org>"
> _______________________________________________
> freebsd-fs at freebsd.org <mailto:freebsd-fs at freebsd.org> mailing list
> https://lists.freebsd.org/mailman/listinfo/freebsd-fs <https://lists.freebsd.org/mailman/listinfo/freebsd-fs>
> To unsubscribe, send any mail to "freebsd-fs-unsubscribe at freebsd.org <mailto:freebsd-fs-unsubscribe at freebsd.org>"