Bug 244799

+++ This bug was initially created as a clone of Bug #225487 +++
RHEL5 clone, 
this bugzilla covers new dmeventd functionality and bugfixes for RHEL5.1

Description of problem:

While running lvm_config on the latest trees I hit a case where the underlying
device mapper devices are not removed when a mirror volume is removed.

Version-Release number of selected component (if applicable):
lvm2-2.02.16-3.el5
kernel-2.6.18-1.2961.el5
device-mapper-1.02.13-1.el5

How reproducible:
100%

Steps to Reproduce:
1. lvm_config -o host
2.
3.
  
Actual results:

Full test output attached.

cleaning up LVs if need be on morph-01...
deactivating and then removing lv /dev/linear_2_602/linear_2_6020 on node morph-01

cleaning up VGs if need be on morph-01...
deactivating vg linear_2_602 on node morph-01
removing vg linear_2_602 on node morph-01

cleaning up PVs if need be on morph-01...
removing pv /dev/sda1 on node morph-01
  Can't open /dev/sda1 exclusively - not removing. Mounted filesystem?
couldn't remove pv /dev/sda1 on morph-01

[root@morph-01 ~]# pvs
  PV         VG   Fmt  Attr PSize   PFree  
  /dev/sda1       lvm2 --   118.71G 118.71G
  /dev/sda2       lvm2 --   118.71G 118.71G
  /dev/sdb1       lvm2 --   118.71G 118.71G
  /dev/sdb2       lvm2 --   118.71G 118.71G
  /dev/sdc1       lvm2 --   118.71G 118.71G
  /dev/sdc2       lvm2 --   118.71G 118.71G
[root@morph-01 ~]# vgs
[root@morph-01 ~]# lvs
[root@morph-01 ~]# dmsetup ls
linear_2_602-linear_2_6020_mlog (253, 2)
VolGroup00-LogVol01     (253, 1)
linear_2_602-linear_2_6020_mimage_1     (253, 4)
VolGroup00-LogVol00     (253, 0)
linear_2_602-linear_2_6020_mimage_0     (253, 3)


Expected results:

All device mapper devices related to the mirror should be removed.

-- Additional comment from nstraz on 2007-01-09 11:28 EST --
I'm hitting another case in mirror_sanity where LVM gets confused wrt DM
devices.  Here it thinks the mirror log is a volume.

[root@morph-01 ~]# pvs
  PV         VG            Fmt  Attr PSize  PFree 
  /dev/sda1  mirror_sanity lvm2 a-   79.14G 79.14G
  /dev/sda2  mirror_sanity lvm2 a-   79.14G 79.14G
  /dev/sda3  mirror_sanity lvm2 a-   79.14G 79.14G
  /dev/sdb1  mirror_sanity lvm2 a-   79.14G 79.14G
  /dev/sdb2  mirror_sanity lvm2 a-   79.14G 79.14G
  /dev/sdb3  mirror_sanity lvm2 a-   79.14G 79.14G
  /dev/sdc1  mirror_sanity lvm2 a-   79.14G 79.13G
  /dev/sdc2  mirror_sanity lvm2 a-   79.14G 79.14G
  /dev/sdc3  mirror_sanity lvm2 a-   79.14G 79.14G
[root@morph-01 ~]# vgs
  VG            #PV #LV #SN Attr   VSize   VFree  
  mirror_sanity   9   1   0 wz--n- 712.23G 712.23G
[root@morph-01 ~]# lvs
  LV                      VG            Attr   LSize Origin Snap%  Move Log Copy% 
  mirror_log_convert_mlog mirror_sanity -wi-a- 4.00M                              
[root@morph-01 ~]# dmsetup ls
mirror_sanity-copy_percent1_mimage_0    (253, 3)
mirror_sanity-mirror_log_convert_mlog   (253, 5)
mirror_sanity-copy_percent1_mlog        (253, 2)
mirror_sanity-mirror_log_convert_mimage_1       (253, 7)
VolGroup00-LogVol01     (253, 1)
mirror_sanity-mirror_log_convert_mimage_0       (253, 6)
VolGroup00-LogVol00     (253, 0)
mirror_sanity-copy_percent1_mimage_1    (253, 4)
[root@morph-01 ~]# lvdisplay
  --- Logical volume ---
  LV Name                /dev/mirror_sanity/mirror_log_convert_mlog
  VG Name                mirror_sanity
  LV UUID                yzo3iF-1WP2-pGnw-hTiS-71Kq-VEYT-E0dINX
  LV Write Access        read/write
  LV Status              available
  # open                 0
  LV Size                4.00 MB
  Current LE             1
  Segments               1
  Allocation             inherit
  Read ahead sectors     0
  Block device           253:5
   

-- Additional comment from agk on 2007-01-30 16:41 EST --
Essential fix for mirroring.

-- Additional comment from cmarthal on 2007-05-09 11:53 EST --
This bug was verified as fixed in rhel4 device-mapper-1.02.17-3.0.1.el4.