freebsd-skq/tools/diag/README
mckusick 9ccdf8ab4d 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.
2018-02-09 19:10:46 +00:00

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$FreeBSD$
This directory is for diagnostic programs.
A diagnostic program is one that will inform you that something is wrong
somewhere, for instance by traversing a kernel-structure and verifying
the integrity.
Please make a subdir per program, and add a brief description to this file.
dumpvfscache program that can be used to examine the contents of the vfs
name cache.
localeck check for invalid/incomplete locales
prtblknos Print out the blocks used by each inode in the list