I had originally implemented the In Kernel Sharetab with GFS and followed the requirement that everything had to be in a directory. As such, I made /system/dfs/sharetab and symlinked /etc/dfs/sharetab to it. Well, while I believe that is really the proper place for it to be at in the name space, I decided to hack GFS to allow me to have a single file as a filesystem - think /etc/mnttab. Between a lab shutdown yesterday and redoing the entire set of changes on kanigix and the latest OpenSolaris drop, I've got the thing working:

[tdh@kanigix dfs]> ls -la
total 17
drwxr-xr-x   2 root     sys          512 Feb 13 07:16 .
drwxr-xr-x  88 root     sys         4608 Feb 17 14:19 ..
-rw-r--r--   1 root     sys          354 Feb 17 11:46 dfstab
-rw-r--r--   1 root     root          68 Feb 17 12:07 fstypes
-r--r--r--   1 root     root         246 Feb 17 14:22 sharetab
[tdh@kanigix dfs]> cat sharetab
/export/zfs/tdh -       nfs     rw
/export/zfs/monster     -       nfs     rw
/export/zfs/nfsv4       -       nfs     rw
/export/zfs/nfsv2       -       nfs     rw
/       -       nfs     rw
/zoo/isos       -       nfs     rw
/export/zfs/nfsv3       -       nfs     rw
/export/home    -       nfs     sec=sys,rw=engineering  home dirs
/export/zfs     -       nfs     rw

What I don't have working just right is the attribute changes:

[tdh@kanigix dfs]> sudo unshare -F nfs /
[tdh@kanigix dfs]> ls -la
total 17
drwxr-xr-x   2 root     sys          512 Feb 13 07:16 .
drwxr-xr-x  88 root     sys         4608 Feb 17 14:19 ..
-rw-r--r--   1 root     sys          354 Feb 17 11:46 dfstab
-rw-r--r--   1 root     root          68 Feb 17 12:07 fstypes
-r--r--r--   1 root     root         246 Feb 17 14:34 sharetab

The size and time will not change until I read the file:

[tdh@kanigix dfs]> cat sharetab
/export/zfs/tdh -       nfs     rw
/export/zfs/monster     -       nfs     rw
/export/zfs/nfsv4       -       nfs     rw
/export/zfs/nfsv2       -       nfs     rw
/zoo/isos       -       nfs     rw
/export/zfs/nfsv3       -       nfs     rw
/export/home    -       nfs     sec=sys,rw=engineering  home dirs
/export/zfs     -       nfs     rw
[tdh@kanigix dfs]> ls -la sharetab 
-r--r--r--   1 root     root         234 Feb 17 14:34 sharetab

I can easily fix that. Instead of recompiling the BFUs, I'm just going to rebuild 'sharefs'. Note if I could unload this module, I could do all of this without rebooting:

[tdh@kanigix sharefs]> pwd
/home/tdh/ws/kanigix/usr/src/uts/common/fs/sharefs
tdh@kanigix sharefs]> cd ../../../intel/sharefs
[tdh@kanigix sharefs]> dmake
dmake: defaulting to parallel mode.
See the man page dmake(1) for more information on setting up the .dmakerc file.
kanigix --> 1 job
...

To see what I need to get into /kernel, a 'dmake install' will tell me a lot:

[tdh@kanigix sharefs]> dmake install
dmake: defaulting to parallel mode.
See the man page dmake(1) for more information on setting up the .dmakerc file.
/usr/bin/rm -f /home/tdh/ws/kanigix/proto/root_i386/kernel/fs/amd64/sharefs; install -s -m 755 -f /home/tdh/ws/kanigix/proto/root_i386/kernel/fs/amd64 debug64/sharefs
/usr/bin/rm -f /home/tdh/ws/kanigix/proto/root_i386/kernel/fs/sharefs; install -s -m 755 -f /home/tdh/ws/kanigix/proto/root_i386/kernel/fs debug32/sharefs
[tdh@kanigix sharefs]> sudo cp /home/tdh/ws/kanigix/proto/root_i386/kernel/fs/amd64/sharefs /kernel/fs/amd64/sharefs
[tdh@kanigix sharefs]> sudo cp /home/tdh/ws/kanigix/proto/root_i386/kernel/fs/sharefs /kernel/fs/sharefs

Now I reboot and test!

The attributes are now following the changes:

[tdh@kanigix dfs]> ls -la sharetab 
-r--r--r--   1 root     root         182 Feb 17 14:43 sharetab
[tdh@kanigix dfs]> sudo share -F nfs /
[tdh@kanigix dfs]> ls -la sharetab
-r--r--r--   1 root     root         194 Feb 17 14:46 sharetab

I'm pretty much done with the project. I have to pull out some code changes, tidy things up, do some more unit testing, and ship it off for some quality assurance. I'll check to see if I can get code put up to OpenSolaris.org in case people want to play with it.