Hi Christophe,
kpartx usually doesn't create a mapping for extended partition.
However, it does if it's empty.
It's harmless but not consistent.
Attached patch makes it consistent by not creating a mapping
even when the extended partition is empty.
Please consider to apply.
If you have logical partitions in extended partition:
# parted /dev/sdc p
Disk geometry for /dev/sdc: 0.000-34686.000 megabytes
Disk label type: msdos
Minor Start End Type Filesystem Flags
1 7.844 31.376 extended
5 7.875 23.532 logical
No mapping is created for extended partition:
# dmsetup table|grep sdc|sort
sdc5: 0 32067 linear 8:32 16128
However, if the extended partition is empty:
# parted /dev/sdc p
Disk geometry for /dev/sdc: 0.000-34686.000 megabytes
Disk label type: msdos
Minor Start End Type Filesystem Flags
1 7.844 31.376 extended
The following mapping is created:
# dmsetup table|grep sdc|sort
sdc1: 0 48195 linear 8:32 16065
Thanks,
Nick
Don't create mapping for extended partition.
--- multipath-tools.orig/kpartx/dos.c 2005-12-02 01:33:41.000000000 +0900
+++ multipath-tools/kpartx/dos.c 2005-12-02 01:33:29.000000000 +0900
@@ -99,8 +99,11 @@ read_dos_pt(int fd, struct slice all, st
"dos_partition: too many slices\n");
break;
}
- if (is_extended(p.sys_type))
+ if (is_extended(p.sys_type)) {
n += read_extended_partition(fd, &p, sp+n, ns-n);
+ /* hide the extended partition itself */
+ sp[i].size = 0;
+ }
}
return n;
}
--
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