[dm-devel] review：retrigger uevents to try and get the uid through udev

[Zhangguanghui]

Hi:
For drbd device, we do not have the normal scsi wwid values,
the patch about  multipath retrigger uevents to try and get the uid through udev may cause a problem.
the path become a orphan path, and don't remove, multipathd have been occupying the drbd device,
it may fail  while mounting.  Thanks

Details:
root at cvknode128:~# lsof | grep drbd
multipath 1542 root 5r BLK 147,0 0t0 131659 /dev/drbd0
multipath 1542 root 6r BLK 147,1 0t0 131669 /dev/drbd1

root at cvknode128:~# multipath -ll -v3
Jul 13 14:44:13 | libdevmapper version 1.02.48 (2010-05-20)
Jul 13 14:44:13 | DM multipath kernel driver v1.9.0
Jul 13 14:44:13 | loading /lib/multipath/libcheckdirectio.so checker
Jul 13 14:44:13 | loading /lib/multipath/libprioconst.so prioritizer
Jul 13 14:44:13 | sr0: blacklisted, udev property missing
Jul 13 14:44:13 | vda: blacklisted, udev property missing
Jul 13 14:44:13 | fd0: blacklisted, udev property missing
Jul 13 14:44:13 | drbd0: blacklisted, udev property missing
Jul 13 14:44:13 | drbd1: blacklisted, udev property missing
Jul 13 14:44:13 | loop0: blacklisted, udev property missing
Jul 13 14:44:13 | loop1: blacklisted, udev property missing
Jul 13 14:44:13 | loop2: blacklisted, udev property missing
Jul 13 14:44:13 | loop3: blacklisted, udev property missing
Jul 13 14:44:13 | loop4: blacklisted, udev property missing
Jul 13 14:44:13 | loop5: blacklisted, udev property missing
Jul 13 14:44:13 | loop6: blacklisted, udev property missing
Jul 13 14:44:13 | loop7: blacklisted, udev property missing
Jul 13 14:44:13 | nbd0: blacklisted, udev property missing
Jul 13 14:44:13 | nbd1: blacklisted, udev property missing
Jul 13 14:44:13 | nbd10: blacklisted, udev property missing
Jul 13 14:44:13 | nbd11: blacklisted, udev property missing
Jul 13 14:44:13 | nbd12: blacklisted, udev property missing
Jul 13 14:44:13 | nbd13: blacklisted, udev property missing
Jul 13 14:44:13 | nbd14: blacklisted, udev property missing
Jul 13 14:44:13 | nbd15: blacklisted, udev property missing
Jul 13 14:44:13 | nbd2: blacklisted, udev property missing
Jul 13 14:44:13 | nbd3: blacklisted, udev property missing
Jul 13 14:44:13 | nbd4: blacklisted, udev property missing
Jul 13 14:44:13 | nbd5: blacklisted, udev property missing
Jul 13 14:44:13 | nbd6: blacklisted, udev property missing
Jul 13 14:44:13 | nbd7: blacklisted, udev property missing
Jul 13 14:44:13 | nbd8: blacklisted, udev property missing
Jul 13 14:44:13 | nbd9: blacklisted, udev property missing
Jul 13 14:44:13 | ram0: blacklisted, udev property missing
Jul 13 14:44:13 | ram1: blacklisted, udev property missing
Jul 13 14:44:13 | ram10: blacklisted, udev property missing
Jul 13 14:44:13 | ram11: blacklisted, udev property missing
Jul 13 14:44:13 | ram12: blacklisted, udev property missing
Jul 13 14:44:13 | ram13: blacklisted, udev property missing
Jul 13 14:44:13 | ram14: blacklisted, udev property missing
Jul 13 14:44:13 | ram15: blacklisted, udev property missing
Jul 13 14:44:13 | ram2: blacklisted, udev property missing
Jul 13 14:44:13 | ram3: blacklisted, udev property missing
Jul 13 14:44:13 | ram4: blacklisted, udev property missing
Jul 13 14:44:13 | ram5: blacklisted, udev property missing
Jul 13 14:44:13 | ram6: blacklisted, udev property missing
Jul 13 14:44:13 | ram7: blacklisted, udev property missing
Jul 13 14:44:13 | ram8: blacklisted, udev property missing
Jul 13 14:44:13 | ram9: blacklisted, udev property missing
===== no paths =====
Jul 13 14:44:13 | unloading const prioritizer
Jul 13 14:44:13 | unloading directio checker
root at cvknode128:~# multipathd -k'show paths'
hcil dev dev_t pri dm_st chk_st dev_st next_check
#:#:#:# drbd1 147:1 -1 undef faulty running orphan
#:#:#:# drbd0 147:0 -1 undef faulty running orphan

root at cvknode128:~# multipath -ll
root at cvknode128:~#

________________________________
zhangguanghui
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