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librbd/diff_iterator: use proper snap to query parent overlap

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If no snapshot has been made, we will use CEPH_NOSNAP instead of 0,
to query the parent overlap.

Fixes bug http://tracker.ceph.com/issues/18200

Signed-off-by: Xiaoxi Chen <xiaoxchen@ebay.com>
This commit is contained in:
Xiaoxi Chen 2016-12-09 02:40:03 +08:00
parent fe814e78b9
commit a88ceff276
1 changed files with 1 additions and 1 deletions
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2
src/librbd/DiffIterate.cc
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@ -264,7 +264,7 @@ int DiffIterate::execute() {
RWLock::RLocker l(m_image_ctx.snap_lock);
RWLock::RLocker l2(m_image_ctx.parent_lock);
uint64_t overlap = end_size;
m_image_ctx.get_parent_overlap(from_snap_id, &overlap);
m_image_ctx.get_parent_overlap(m_image_ctx.snap_id, &overlap);
r = 0;
if (m_image_ctx.parent && overlap > 0) {
ldout(cct, 10) << " first getting parent diff" << dendl;