[lvm-devel] [PATCH] Add verbose log messages for LV stacking

[Jun'ichi Nomura]

Adding verbose log message for '-vvvv'.

Examples:

When adding a temporary layer for mirror resync:
...
#metadata/lv_manip.c:1861     Creating logical volume lvol1_mimagetmp_2
#metadata/lv_manip.c:2409       Inserting layer lvol1_mimagetmp_2 for lvol1
#metadata/lv_manip.c:346       Stack lvol1:0[0] on LV lvol1_mimagetmp_2:0
#metadata/lv_manip.c:46       Adding lvol1:0 as an user of lvol1_mimagetmp_2
..
#metadata/lv_manip.c:266       Remove lvol1:0[0] from the top of LV lvol1_mimage
tmp_2:0
#metadata/lv_manip.c:72       lvol1:0 is no longer a user of lvol1_mimagetmp_2
#metadata/lv_manip.c:346       Stack lvol1:0[0] on LV lvol1_mimagetmp_2:0
#metadata/lv_manip.c:46       Adding lvol1:0 as an user of lvol1_mimagetmp_2
#metadata/lv_manip.c:346       Stack lvol1:0[1] on LV lvol1_mimage_2:0
#metadata/lv_manip.c:46       Adding lvol1:0 as an user of lvol1_mimage_2
..

Then, removing the temporary layer:
#metadata/mirror.c:456       Reducing mirror set from 2 to 1 image(s) and no log volume.
#metadata/lv_manip.c:266       Remove lvol1:0[1] from the top of LV lvol1_mimage_2:0
#metadata/lv_manip.c:72       lvol1:0 is no longer a user of lvol1_mimage_2
#metadata/lv_manip.c:2336       Removing layer lvol1_mimagetmp_2 for lvol1
#metadata/lv_manip.c:346       Stack lvol1:0[2] on LV lvol1_mimage_2:0
#metadata/lv_manip.c:46       Adding lvol1:0 as an user of lvol1_mimage_2
...

Thanks,
-- 
Jun'ichi Nomura, NEC Corporation of America
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