Bug 1291896

Description of problem:
So far this only appears to affect cache volumes with lvmlockd. I've tried linear, raid1, and stripe and none were auto unmounted by systemd when the volume was renamed.


SCENARIO - [cache_pool_rename]

*** Cache info for this scenario ***
*  origin (slow):  /dev/mapper/mpatha1
*  pool (fast):    /dev/mapper/mpathc1
************************************

Create a cache volume with fs data, and then rename both the cache pool and cache origin volume
Adding "slow" and "fast" tags to corresponding pvs
Create origin (slow) volume
lvcreate --activate ey -L 4G -n rename_orig_A cache_sanity @slow

Create cache data and cache metadata (fast) volumes
lvcreate --activate ey -L 4G -n rename_pool_A cache_sanity @fast
lvcreate --activate ey -L 12M -n rename_pool_A_meta cache_sanity @fast

Create cache pool volume by combining the cache data and cache metadata (fast) volumes with policy: smq  mode: writeback
lvconvert --yes --type cache-pool --cachepolicy smq --cachemode writeback -c 32 --poolmetadata cache_sanity/rename_pool_A_meta cache_sanity/rename_pool_A
  WARNING: Converting logical volume cache_sanity/rename_pool_A and cache_sanity/rename_pool_A_meta to pool's data and metadata volumes.
  THIS WILL DESTROY CONTENT OF LOGICAL VOLUME (filesystem etc.)
Create cached volume by combining the cache pool (fast) and origin (slow) volumes
lvconvert --yes --type cache --cachepool cache_sanity/rename_pool_A cache_sanity/rename_orig_A

Placing an xfs filesystem on origin volume
mkfs.xfs -f /dev/cache_sanity/rename_orig_A
Mounting origin volume
mkdir -p /mnt/rename_orig_A
mount /dev/cache_sanity/rename_orig_A /mnt/rename_orig_A

Writing files to /mnt/rename_orig_A
/usr/tests/sts-rhel7.2/bin/checkit -w /mnt/rename_orig_A -f /tmp/checkit_origin_1 -n 500

Checking files on /mnt/rename_orig_A
/usr/tests/sts-rhel7.2/bin/checkit -w /mnt/rename_orig_A -f /tmp/checkit_origin_1 -v

syncing before snap creation...
Renaming cache ORIGIN volume...
lvrename cache_sanity/rename_orig_A cache_sanity/rename_orig_B


Dec 15 17:33:46 mckinley-03 qarshd[14424]: Running cmdline: lvrename cache_sanity/rename_orig_A cache_sanity/rename_orig_B
Dec 15 17:33:48 mckinley-03 systemd: Unmounting /mnt/rename_orig_A...
Dec 15 17:33:48 mckinley-03 systemd: Requested transaction contradicts existing jobs: Resource deadlock avoided
Dec 15 17:33:48 mckinley-03 kernel: XFS (dm-21): Unmounting Filesystem
Dec 15 17:33:48 mckinley-03 systemd: Unmounted /mnt/rename_orig_A.



[root@mckinley-03 mnt]# lvs -a -o +devices
  LV                    VG               Attr       LSize   Pool            Origin                Data%  Meta%  Move Log Cpy%Sync Convert Devices                  
  [lvmlock]             cache_sanity     -wi-ao---- 256.00m                                                                               /dev/mapper/mpathh1(0)   
  [lvol0_pmspare]       cache_sanity     ewi-------  12.00m                                                                               /dev/mapper/mpathh1(64)  
  rename_orig_B         cache_sanity     Cwi-a-C---   4.00g [rename_pool_A] [rename_orig_B_corig] 4.03   12.92           0.00             rename_orig_B_corig(0)   
  [rename_orig_B_corig] cache_sanity     owi-aoC---   4.00g                                                                               /dev/mapper/mpatha1(0)   
  [rename_pool_A]       cache_sanity     Cwi---C---   4.00g                                       4.03   12.92           0.00             rename_pool_A_cdata(0)   
  [rename_pool_A_cdata] cache_sanity     Cwi-ao----   4.00g                                                                               /dev/mapper/mpathc1(0)   
  [rename_pool_A_cmeta] cache_sanity     ewi-ao----  12.00m                                                                               /dev/mapper/mpathc1(1024)
  [lvmlock]             global           -wi-ao---- 256.00m                                                                               /dev/mapper/mpathd1(0)   


Version-Release number of selected component (if applicable):
3.10.0-325.el7.x86_64
systemd-219-19.el7.x86_64

lvm2-2.02.130-5.el7    BUILT: Wed Oct 14 08:27:29 CDT 2015
lvm2-libs-2.02.130-5.el7    BUILT: Wed Oct 14 08:27:29 CDT 2015
lvm2-cluster-2.02.130-5.el7    BUILT: Wed Oct 14 08:27:29 CDT 2015
device-mapper-1.02.107-5.el7    BUILT: Wed Oct 14 08:27:29 CDT 2015
device-mapper-libs-1.02.107-5.el7    BUILT: Wed Oct 14 08:27:29 CDT 2015
device-mapper-event-1.02.107-5.el7    BUILT: Wed Oct 14 08:27:29 CDT 2015
device-mapper-event-libs-1.02.107-5.el7    BUILT: Wed Oct 14 08:27:29 CDT 2015
device-mapper-persistent-data-0.5.5-1.el7    BUILT: Thu Aug 13 09:58:10 CDT 2015
cmirror-2.02.130-5.el7    BUILT: Wed Oct 14 08:27:29 CDT 2015
sanlock-3.2.4-1.el7    BUILT: Fri Jun 19 12:48:49 CDT 2015
sanlock-lib-3.2.4-1.el7    BUILT: Fri Jun 19 12:48:49 CDT 2015
lvm2-lockd-2.02.130-5.el7    BUILT: Wed Oct 14 08:27:29 CDT 2015