[illumos-gate] 17763 Fix -Wuse-after-free warning in dbuf_destroy() -- Brian Behlendorf <behlendorf1⊙lg>

i must be having a brain fart.. if I want to issue a DKIOCFLUSHWRITECACHE ioctl to a disk, which disk node does it need to be? I thought the /dev/dsk/..p0 node should work since it's the whole disk (and IIRC the node without any slice or partition only happens with UEFI disks)

but it's showing ENOTTY (I also tried the /dev/rdsk/...p0 node)

(I'm trying to write directly to a partition w/o a fs on it, and want to flush the disk cache to ensure ordering)