Re: vfs whitebox test

[Pat LaVarre <p.lavarre@ieee.org>]

Kindly offline I'm reminded the man mount example:

mount /tmp/fdimage /mnt -t msdos -o loop=/dev/loop3,blocksize=1024

is a hint that we have some control over virtual block size.

Not yet enough.

Despite mkudffs -b $bs (syntax from fs/udf/super.c) and mount -o
loop,bs=$bs (syntax from man mount) still we get 512 from `sudo blockdev
--getss` e.g.

$ udfbs 0 10 sudo blockdev --getss /dev/loop0
...
+ sudo blockdev --getss /dev/loop0
512
+ sudo umount /mnt/loop0
$

Pat LaVarre

--- /dev/null	2003-01-30 03:24:37.000000000 -0700
+++ bin/udfbs	2003-12-05 11:07:13.199344360 -0700
@@ -0,0 +1,21 @@
+#!/bin/bash -x
+
+mkbs='-b 2048'
+mobs=',bs=2048'
+
+cmd="dd if=/dev/zero of=dd.bin bs=1M seek=$1 count=$2"
+echo "$cmd 2>/dev/null"
+$cmd 2>/dev/null
+shift 2
+
+sudo losetup /dev/loop0 dd.bin
+sudo mkudffs $mkbs /dev/loop0 >/dev/null
+sudo losetup -d /dev/loop0
+sudo mount -t udf dd.bin /mnt/loop0 -o loop$mobs
+sudo chown `id -g`:`id -u` /mnt/loop0/.
+
+export PS1="udfbs \$ "
+ls -l `which sh`
+"$@"
+
+sudo umount /mnt/loop0