Bug#782400: multipath-tools: libmultipath: fix discovery of devices with empty rev sysfs attribute

Sat, 11 Apr 2015 09:03:24 -0700 

Package: src:multipath-tools
Version: 0.5.0-6
Severity: serious
Tags: patch
Forwarded: https://www.redhat.com/archives/dm-devel/2015-April/msg00049.html

Hi Ritesh,

I noticed some IPR controllers with multipath support may have only
spaces in the rev sysfs attribute, which breaks a device's discovery
(example below got no paths at all).

May you please consider this (forwarded) patch for Jessie?

Thank you.


Example:
-------

The disks in this IPR controller:

        # grep . /sys/block/sda/device/{vendor,model,rev} | tr ' ' '#'
        /sys/block/sda/device/vendor:IBM#####
        /sys/block/sda/device/model:IPR-0###5EC99A00
        /sys/block/sda/device/rev:####

All of them (6 disks, 2 paths per disk):

        # grep . /sys/block/sd*/device/rev | tr ' ' '#'
        /sys/block/sda/device/rev:####
        /sys/block/sdb/device/rev:####
        /sys/block/sdc/device/rev:####
        /sys/block/sdd/device/rev:####
        /sys/block/sde/device/rev:####
        /sys/block/sdf/device/rev:####
        /sys/block/sdg/device/rev:####
        /sys/block/sdh/device/rev:####
        /sys/block/sdi/device/rev:####
        /sys/block/sdj/device/rev:####
        /sys/block/sdk/device/rev:####
        /sys/block/sdl/device/rev:####

Comparison of 'multipath -v3' without/with the patch
(notice 'no paths' vs. 'paths list')

        # diff -u multipath-v3.no-timestamp.{old,new}
        <...>
          sda: vendor = IBM
          sda: product = IPR-0   5EC99A00
        + sda: rev =
        + sda: h:b:t:l = 0:2:0:0
        + sda: tgt_node_name =
        + sda: path state = running
        + sda: 4252 cyl, 128 heads, 32 sectors/track, start at 0
        <...>
        + sda: alua prio = 50
          sdb: <...>
        <...>
        -===== no paths =====
        +===== paths list =====
+uuid hcil dev dev_t pri dm_st chk_st vend/prod/rev +1IBM_IPR-0_5EC99A0000000410 0:2:0:0 sda 8:0 50 undef ready IBM,IPR-0 5EC +1IBM_IPR-0_5EC99A00000003F0 0:2:1:0 sdb 8:16 50 undef ready IBM,IPR-0 5EC +1IBM_IPR-0_5EC99A00000003D0 0:2:2:0 sdc 8:32 50 undef ready IBM,IPR-0 5EC +1IBM_IPR-0_5EC99A0000000430 0:2:3:0 sdd 8:48 50 undef ready IBM,IPR-0 5EC +1IBM_IPR-0_5EC9470000000060 0:2:4:0 sde 8:64 50 undef ready IBM,IPR-0 5EC +1IBM_IPR-0_5EC9470000000080 0:2:5:0 sdf 8:80 50 undef ready IBM,IPR-0 5EC +1IBM_IPR-0_5EC99A0000000410 1:2:0:0 sdg 8:96 10 undef ready IBM,IPR-0 5EC +1IBM_IPR-0_5EC99A00000003F0 1:2:1:0 sdh 8:112 10 undef ready IBM,IPR-0 5EC +1IBM_IPR-0_5EC99A00000003D0 1:2:2:0 sdi 8:128 10 undef ready IBM,IPR-0 5EC +1IBM_IPR-0_5EC9470000000080 1:2:3:0 sdj 8:144 10 undef ready IBM,IPR-0 5EC +1IBM_IPR-0_5EC9470000000060 1:2:4:0 sdk 8:160 10 undef ready IBM,IPR-0 5EC +1IBM_IPR-0_5EC99A0000000430 1:2:5:0 sdl 8:176 10 undef ready IBM,IPR-0 5EC 
        <...>




--
Mauricio Faria de Oliveira
IBM Linux Technology Center


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