This is a little C-program that can be used to print out the list
of blocks used by a requested list of inodes.
For example, to list the blocks referenced by your kernel:
guest_12 % df /
Filesystem 1K-blocks Used Avail Capacity Mounted on
/dev/gpt/rootfs
20307196 10707336 7975288 57% /
guest_12 % ls -i /boot/kernel/kernel
160603 /boot/kernel/kernel
guest_12 % ./prtblknos /dev/gpt/rootfs 160603
160603: lbn 0-7 blkno
3217584-
3217647
lbn 8-11 blkno
3217864-
3217895 distance 216
First-level indirect, blkno
3217896-
3217903 distance 0
lbn 12-19 blkno
3217904-
3217967 distance 8
lbn 20-75 blkno
3251816-
3252263 distance 33848
lbn 76-83 blkno
3252368-
3252431 distance 104
lbn 84-91 blkno
3252464-
3252527 distance 32
lbn 92-852 blkno
3252896-
3258983 distance 368
Each contiguous range of blocks is printed on a line.
The distance metric is the size of the gap from the end of the
previous set of blocks to the beginning of the next set of blocks.
Short distances are desirable.