Bug#586104: fails to map extended partitions

[martin f krafft]

also sprach Guido Günther <agx at sigxcpu.org> [2010.06.16.1708 +0200]:
> kpartx handles extended partitions nicely, we're using this on literally
> dozenzs of servers here - although not on loop but SAN devices. 
> 
>     Is there anything in dmseg?

See below: yes. (dm-18 too small for target)

> 
> The ioctl fails so I think the issue is with the kernel sine the "add
> map" commands all look sane or am I missing something?
> 
>     Could you check Squeeze's 2.6.32?
> 
>     Could you check if adding a map using dmsetup e.g. for loop0p7 works
>     as expected?

piper:~|master|.tmp/cdt.YeESOF% dd if=/dev/zero of=disk.img bs=1M count=1 seek=511
1+0 records in
1+0 records out
1048576 bytes (1.0 MB) copied, 0.0110016 s, 95.3 MB/s
piper:~|master|.tmp/cdt.YeESOF% sudo losetup -fv disk.img
Loop device is /dev/loop0
piper:~|master|.tmp/cdt.YeESOF% sudo sfdisk /dev/loop0 <<_eof
heredoc> # partition table of /dev/loop0
heredoc> unit: sectors
heredoc> 
heredoc> /dev/loop0p1 : start=       63, size=   192717, Id=83
heredoc> /dev/loop0p2 : start=   192780, size=   192780, Id=83
heredoc> /dev/loop0p3 : start=   385560, size=   658665, Id= 5
heredoc> /dev/loop0p4 : start=        0, size=        0, Id= 0
heredoc> /dev/loop0p5 : start=   385623, size=   192717, Id=83
heredoc> /dev/loop0p6 : start=   578403, size=   192717, Id=83
heredoc> /dev/loop0p7 : start=   771183, size=   273042, Id=83
heredoc> _eof
Checking that no-one is using this disk right now ...
BLKRRPART: Invalid argument
OK
Disk /dev/loop0: cannot get geometry

Disk /dev/loop0: 65 cylinders, 255 heads, 63 sectors/track
Old situation:
Units = cylinders of 8225280 bytes, blocks of 1024 bytes, counting from 0

   Device Boot Start     End   #cyls    #blocks   Id  System
/dev/loop0p1          0+     11      12-     96358+  83  Linux
/dev/loop0p2         12      23      12      96390   83  Linux
/dev/loop0p3         24      64      41     329332+   5  Extended
/dev/loop0p4          0       -       0          0    0  Empty
/dev/loop0p5         24+     35      12-     96358+  83  Linux
/dev/loop0p6         36+     47      12-     96358+  83  Linux
/dev/loop0p7         48+     64      17-    136521   83  Linux
New situation:
Units = sectors of 512 bytes, counting from 0

   Device Boot    Start       End   #sectors  Id  System
/dev/loop0p1            63    192779     192717  83  Linux
/dev/loop0p2        192780    385559     192780  83  Linux
/dev/loop0p3        385560   1044224     658665   5  Extended
/dev/loop0p4             0         -          0   0  Empty
/dev/loop0p5        385623    578339     192717  83  Linux
/dev/loop0p6        578403    771119     192717  83  Linux
/dev/loop0p7        771183   1044224     273042  83  Linux
Warning: no primary partition is marked bootable (active)
This does not matter for LILO, but the DOS MBR will not boot this disk.
Successfully wrote the new partition table

Re-reading the partition table ...
BLKRRPART: Invalid argument

If you created or changed a DOS partition, /dev/foo7, say, then use dd(1)
to zero the first 512 bytes:  dd if=/dev/zero of=/dev/foo7 bs=512 count=1
(See fdisk(8).)

piper:~|master|.tmp/cdt.YeESOF% sudo kpartx -av /dev/loop0
add map loop0p1 (253:16): 0 192717 linear /dev/loop0 63
add map loop0p2 (253:17): 0 192780 linear /dev/loop0 192780
add map loop0p3 (253:18): 0 658665 linear /dev/loop0 385560
add map loop0p5 : 0 192717 linear 253:18 385623
device-mapper: resume ioctl failed: Invalid argument
add map loop0p6 : 0 192717 linear 253:18 578403
device-mapper: resume ioctl failed: Invalid argument
add map loop0p7 : 0 273042 linear 253:18 771183

piper:~|master|.tmp/cdt.YeESOF% dmesg | grep device-mapper
[4582154.293100] device-mapper: table: 253:20: dm-18 too small for target: start=578403, len=192717, dev_size=658665
[4582154.304242] device-mapper: table: 253:20: dm-18 too small for target: start=771183, len=273042, dev_size=658665

The same happens with dmsetup.

Hth,

-- 
 .''`.   martin f. krafft <madduck at d.o>      Related projects:
: :'  :  proud Debian developer               http://debiansystem.info
`. `'`   http://people.debian.org/~madduck    http://vcs-pkg.org
  `-  Debian - when you have better things to do than fixing systems
 
"sailing is, after all, a kind of grace, a kind of magic."
                                                        -- phil berman
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: application/pgp-signature
Size: 198 bytes
Desc: Digital signature (see http://martin-krafft.net/gpg/)
URL: <http://lists.alioth.debian.org/pipermail/pkg-lvm-maintainers/attachments/20100616/fe9ef6d8/attachment-0001.pgp>