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'pvmove -n name pv1 pv2' allows to collocate multiple RAID SubLVs
on pv2 (e.g. results in collocated raidlv_rimage_0 and raidlv_rimage_1),
thus causing loss of resilence and/or performance of the RaidLV.
Fix this pvmove flaw leading to potential data loss in case of PV failure
by preventing any SubLVs from collocation on any PVs of the RaidLV.
Still allow to collocate any DataLVs of a RaidLV with their sibling MetaLVs
and vice-versa though (e.g. raidlv_rmeta_0 on pv1 may still be moved to pv2
already holding raidlv_rimage_0).
Because access to the top-level RaidLV name is needed,
promote local _top_level_lv_name() from raid_manip.c
to global top_level_lv_name().
- resolves rhbz1202497
Adding MetaLVs to given DataLVs (e.g. raid0 -> raid0_meta takeover),
_avoid_pvs_with_other_images_of_lv() was missing code to prohibit
allocation when called with a just allocated MetaLV to prohibit
collaocation of the next allocated MetaLV on the same PV.
- resolves rhbz1366738
'lvchange --resync LV' or 'lvchange --syncaction repair LV' request the
RAID layout specific parity blocks in raid4/5/6 to be recreated or the
mirrored blocks to be copied again from the master leg/copy for raid1/10,
thus not allowing a rebuild of a particular PV.
Introduce repeatable option '--[raid]rebuild PV' to allow to request
rebuilds of specific PVs in a RaidLV which are known to contain corrupt
data (e.g. rebuild a raid1 master leg).
Add test lvchange-rebuild-raid.sh to test/shell doing rebuild
variations on raid1/10 and 5; add aux function check_status_chars
to support the new test.
- Resolves rhbz1064592
Any failing stripes in raid0/raid0_meta type LVs cause data loss,
thus replacement via 'lvconvert --replace...' does not make sense.
Patch prohibits replacement on raid0/raid0_meta LVs.
- resolves rhbz1356734
An unconditional access to the non-existing MetaLV of a raid0 LV in
lv_raid_remove_missing() was causing the segfault.
Only call log_debug() on replacements of existing MetaLVs.
- resolves rhbz1354646
Skip testing target_pvs for NULL, we already
dereference it in many other places.
If check would ever be needed - it needs to be
in front of _raid_extract_images().
When kernel target reports sync status as 0% it might as well mean
it's 100% in sync, just the target is in some race inconsistent
state - so reread once again and take a more optimistic value ;)
Patch tries to work around:
https://bugzilla.redhat.com/show_bug.cgi?id=1210637
