dmsetup: there is no any warning about 4K logical block size

[Alexander Sashnov]

dmsetup: there is no any warning about 4K logical block size (no warning by programm, no warning in man page).

How to reproduce:

Followed page 7 of http://mbroz.fedorapeople.org/talks/DeviceMapperBasics/dm.pdf
I tried following:

dmsetup-test.sh:
-----------------------------------------
#!/bin/sh

sudo dmsetup create bad_disk << EOF
  0 8 linear /dev/sda1 0
  8 1 error
  9 100 linear /dev/sda1 9
EOF

sudo badblocks /dev/mapper/bad_disk
-----------------------------------------

Actual result:

Script output is:
4
5
6
7

In /var/log/kernel.log (tail -f, then press ENTER to make a gap and run script in another console).
Following was added during this script worked:

Jun 29 16:08:54 HP-635 kernel: [33498.146296] Buffer I/O error on device dm-1, logical block 8
Jun 29 16:08:54 HP-635 kernel: [33498.147299] Buffer I/O error on device dm-1, logical block 8
Jun 29 16:08:54 HP-635 kernel: [33498.147614] Buffer I/O error on device dm-1, logical block 8
Jun 29 16:08:54 HP-635 kernel: [33498.147981] Buffer I/O error on device dm-1, logical block 8
Jun 29 16:08:54 HP-635 kernel: [33498.148276] Buffer I/O error on device dm-1, logical block 8
Jun 29 16:08:54 HP-635 kernel: [33498.148639] Buffer I/O error on device dm-1, logical block 8

Expected result:

1. Warning from dmsetup: sectors in mapping table is not aligned by 8

2. Warning about aligment in 'man dmsetup' in section TABLE FORMAT.

Additional info:

$ sudo dmsetup table /dev/mapper/bad_disk
0 8 linear 8:1 0
8 1 error
9 100 linear 8:1 9

$ sudo blockdev --report /dev/mapper/bad_disk
RO RA SSZ BSZ StartSec Size Device
rw 256 512 512 0 55808 /dev/mapper/bad_disk

$ sudo blockdev --report /dev/sda
RO RA SSZ BSZ StartSec Size Device
rw 256 512 4096 0 320072933376 /dev/sda

ProblemType: Bug
DistroRelease: Ubuntu 13.04
Package: dmsetup 2:1.02.74-6ubuntu4
ProcVersionSignature: Ubuntu 3.8.0-25.37-generic 3.8.13
Uname: Linux 3.8.0-25-generic i686
ApportVersion: 2.9.2-0ubuntu8.1
Architecture: i386
Date: Sat Jun 29 15:47:24 2013
InstallationDate: Installed on 2013-05-02 (58 days ago)
InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release i386 (20130424)
MarkForUpload: True
SourcePackage: lvm2
UpgradeStatus: No upgrade log present (probably fresh install)