In place of padding in zfs znode i added a new field. stored an integer value
and am able to see saved information.
but after reboot it is not there. If i was able to access before reboot so it
must be in memory. I think i need to save it to disk.
how does one force zfs znode to disk.
right now i dont do anything special for it. Just made an ioctl, accessed znode
and made changes.
example in zfs_ioctl
case add_new:
zp = VTOZ(vp);
zp->z_phys->new_field = 2;
return(0);
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