Include ZFS

[jonathanfemideer]

At least one other person is interested in using Heads with ZFS.

If there is not enough room in the X230 ROM for both ZFS and LVM functionality, then perhaps the user could be empowered to choose one or the other, as they are unlikely to need both.

[osresearch]

I looked into building zfs (and spl) and it looks like there is a complication with building modules. configure fails on that step with this error:

configure:15600: cp conftest.c build && make modules -C ../linux-4.9.20 EXTRA_CFLAGS=-Werror-implicit-function-declaration   M=/build/heads/build/spl-0.6.5.9/build 
make[3]: *** No rule to make target 'tools/objtool/objtool', needed by '/build/heads/build/spl-0.6.5.9/build/conftest.o'.  Stop.
make[2]: *** [_module_/build/heads/build/spl-0.6.5.9/build] Error 2

Since the kernel was cross compiled, we don't have the host tools built.

[osresearch]

With the objtool built there are lots of errors in spl/module/splat/splat-cred.c that prevent it from building. I haven't debugged it further.

/build/heads/build/spl-0.6.5.9/module/spl/spl-cred.c: In function 'crgetngroups':
/build/heads/build/spl-0.6.5.9/module/spl/spl-cred.c:94:11: error: 'NGROUPS_PER_BLOCK' undeclared (first use in this function)
  if (rc > NGROUPS_PER_BLOCK) {
           ^
/build/heads/build/spl-0.6.5.9/module/spl/spl-cred.c:94:11: note: each undeclared identifier is reported only once for each function it appears in
/build/heads/build/spl-0.6.5.9/module/spl/spl-cred.c: In function 'crgetgroups':
/build/heads/build/spl-0.6.5.9/module/spl/spl-cred.c:119:8: error: 'struct group_info' has no member named 'nblocks'
  if (gi->nblocks > 0)
        ^
In file included from /build/heads/build/spl-0.6.5.9/module/spl/spl-cred.c:27:0:
/build/heads/build/spl-0.6.5.9/module/spl/spl-cred.c:120:27: error: 'struct group_info' has no member named 'blocks'
   gids = KGIDP_TO_SGIDP(gi->blocks[0]);
                           ^
/build/heads/build/spl-0.6.5.9/include/sys/cred.h:60:30: note: in definition of macro 'KGIDP_TO_SGIDP'
 #define KGIDP_TO_SGIDP(x) (&(x)->val)
                              ^
make[7]: *** [scripts/Makefile.build:293: /build/heads/build/spl-0.6.5.9/module/spl/spl-cred.o] Error 1

[osresearch]

I've pushed the submodules files to the zfs branch if you want to try to make it work. You'll need to run make -C build/linux-4.9.20/tools objtool to ensure that the host tools are built.