[PATCH] and more extras/multipath updates

[PATCH] and more extras/multipath updates

* configure the multipath target with round-robin path selector and
conservative default for a start : yes it makes this release the first
really useful one.
* temporarily disable map creation for single path device due to current
restrictive defaults in the kernel target. Sistina should work it out.
* correct the strncmp logic in blacklist function.

Tested on StorageWorks with 2.6.0-test10-udm1 :

xa-s03:~# ./multipath -v
60001fe1000bdad0000903507109004b (1 0 1 1) /dev/sda op:1 /dev/sda
[HSG80           ]
60001fe1000bdad000090371312100bf (1 0 1 2) /dev/sdb op:1 /dev/sdb
[HSG80           ]
60001fe1000bdad000090371312100c2 (1 0 1 3) /dev/sdc op:1 /dev/sdc
[HSG80           ]
60001fe1000bdad00009037131210067 (1 0 2 1) /dev/sdd op:1 /dev/sdd
[HSG80           ]
60001fe1000bdad000090371312100b3 (1 0 2 2) /dev/sde op:1 /dev/sde
[HSG80           ]
60001fe1000bdad00009035071090024 (1 0 2 3) /dev/sdf op:1 /dev/sdf
[HSG80           ]
600508b4000156d700012000000b0000 (1 0 3 1) /dev/sdg op:1 /dev/sdg
[HSV110 (C)COMPAQ]
600508b4000156c30001200000210000 (1 0 3 2) /dev/sdh op:1 /dev/sdh
[HSV110 (C)COMPAQ]
600508b4000156d700012000000b0000 (1 0 6 1) /dev/sdi op:1 /dev/sdi
[HSV110 (C)COMPAQ]
600508b4000156c30001200000210000 (1 0 6 2) /dev/sdj op:1 /dev/sdj
[HSV110 (C)COMPAQ]

60001fe1000bdad0000903507109004b
 \_(1 0 1 1) /dev/sda op:1 /dev/sda [HSG80           ]
60001fe1000bdad000090371312100bf
 \_(1 0 1 2) /dev/sdb op:1 /dev/sdb [HSG80           ]
60001fe1000bdad000090371312100c2
 \_(1 0 1 3) /dev/sdc op:1 /dev/sdc [HSG80           ]
60001fe1000bdad00009037131210067
 \_(1 0 2 1) /dev/sdd op:1 /dev/sdd [HSG80           ]
60001fe1000bdad000090371312100b3
 \_(1 0 2 2) /dev/sde op:1 /dev/sde [HSG80           ]
60001fe1000bdad00009035071090024
 \_(1 0 2 3) /dev/sdf op:1 /dev/sdf [HSG80           ]
600508b4000156d700012000000b0000
 \_(1 0 3 1) /dev/sdg op:1 /dev/sdg [HSV110 (C)COMPAQ]
 \_(1 0 6 1) /dev/sdi op:1 /dev/sdi [HSV110 (C)COMPAQ]
600508b4000156c30001200000210000
 \_(1 0 3 2) /dev/sdh op:1 /dev/sdh [HSV110 (C)COMPAQ]
 \_(1 0 6 2) /dev/sdj op:1 /dev/sdj [HSV110 (C)COMPAQ]

N|600508b4000156d700012000000b0000 : 0 4194304 multipath 2 2 10
round-robin 2 /dev/sdg 10 2 1 2 /dev/sdi 10 2 1 2
N|600508b4000156c30001200000210000 : 0 20971520 multipath 2 2 10
round-robin 2 /dev/sdh 10 2 1 2 /dev/sdj 10 2 1 2
xa-s03:~# dmsetup ls
600508b4000156c30001200000210000        (254, 1)
600508b4000156d700012000000b0000        (254, 0)
xa-s03:~# ll /dev/mapper/
total 0
brw-------    1 root     root     254,   1 Dec  9 22:57
600508b4000156c30001200000210000
brw-------    1 root     root     254,   0 Dec  9 22:57
600508b4000156d700012000000b0000
crw-------    1 root     root      10,  63 Jul 25 22:48 control
xa-s03:~# dd if=/dev/mapper/600508b4000156c30001200000210000
of=/dev/null bs=1M count=500
500+0 records in
500+0 records out
524288000 bytes transferred in 5.662530 seconds (92589003 bytes/sec)

gee, that pretty fast :)