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When multiple polling tasks are watching for same LV, clearly
when some of them wins the game - other polling tasks will fail.
Improve the logic and report success if the merged LV is
actually not a merging origin anymore (since likely someone
else has already finished merging).
The correct test needs to actually check 'lv->snapshot' is not NULL,
so the 'find_snapshot()' can work.
Test lv_is_snapshot was actually irrelavant for this case.
Also initialize device_id.
LV may not be a snapshot type, the return value of find_snapshot(lv) may be NULL.
Here, we will call stack if LV is not a snapshot type.
Signed-off-by: Wu Guanghao <wuguanghao3@huawei.com>
Signed-off-by: Zhiqiang Liu <liuzhiqiang26@huawei.com>
Since we may want to swap names when LVs are complex types, we cannot
avoid doing full renames on both LV stacks.
Temporarily use 'pvmove_tmeta' as unused name to prevent validation troubles.
This commit has no impact on functionality. Code required to
be visible outside lvconvert.c is just moved into new file
lvconvert_poll.c and some calls are made non-static and
declared in new header file lvconvert.h
