Debugging notes:
name = udev_device_get_sysname(parent);
if (sscanf(name, "%d:%d:%d:%d", &host, &bus, &target, &lun) != 4)
return NULL;
This works fine, host is "10" in the scsi_debug case above.
But then the code below which does "Rebase host offset to get the local
relative number" turns host into a "0" as 10 is the smallest host number
on that device. This code is a bit dubious to me, I'll ask Kay.
** Summary changed:
- /dev/disk/by-path link for scsi disks always has host "0", causing conflicts
+ [udev] /dev/disk/by-path link for scsi disks always has host "0", causing
conflicts
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https://bugs.launchpad.net/bugs/1321816
Title:
[udev] /dev/disk/by-path link for scsi disks always has host "0",
causing conflicts
Status in “systemd” package in Ubuntu:
Triaged
Bug description:
The /dev/disk/by-path links to scsi disks are supposed to be of the
form "scsi-$host:$bus:$device$lun". The host portion is always zero,
leading to duplicates from different hosts. It appears these numbers
are pulled from ID_PATH, and I can't figure out where this variable
comes from.
I noticed this while playing around with the lio fake scsi target
adapter. Here is the full udev info on a disk created on such an
adapter. As you can see, it has been assigned scsi host id 13, so
that is what it should be using for the $host digit, rather than zero.
P:
/devices/tcm_loop_0/tcm_loop_adapter_5/host13/target13:0:1/13:0:1:0/block/sdg
N: sdg
S: disk/by-path/scsi-0:0:1:0
E: DEVLINKS=/dev/disk/by-path/scsi-0:0:1:0
E: DEVNAME=/dev/sdg
E:
DEVPATH=/devices/tcm_loop_0/tcm_loop_adapter_5/host13/target13:0:1/13:0:1:0/block/sdg
E: DEVTYPE=disk
E: ID_BUS=scsi
E: ID_MODEL=FILEIO
E: ID_MODEL_ENC=FILEIO\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20
E: ID_PART_TABLE_TYPE=dos
E: ID_PATH=scsi-0:0:1:0
E: ID_PATH_TAG=scsi-0_0_1_0
E: ID_REVISION=4.0
E: ID_SCSI=1
E: ID_TYPE=disk
E: ID_VENDOR=LIO-ORG
E: ID_VENDOR_ENC=LIO-ORG\x20
E: MAJOR=8
E: MINOR=96
E: SUBSYSTEM=block
E: USEC_INITIALIZED=400656927711
E: nomdmonddf=1
E: nomdmonisw=1
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