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librbd/io: conditionally disable move optimization

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If the requested write length does not match the provided bufferlist
length, disable the move optimization and instead fallback to creating
a new sub-bufferlist for the object request.

Fixes: https://tracker.ceph.com/issues/49173
Signed-off-by: Jason Dillaman <dillaman@redhat.com>
This commit is contained in:
Jason Dillaman 2021-02-04 11:17:48 -05:00
parent cbfc083289
commit 8dbb4a3d97
1 changed files with 2 additions and 1 deletions
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3
src/librbd/io/ImageRequest.cc
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@ -527,7 +527,8 @@ ObjectDispatchSpec *ImageWriteRequest<I>::create_object_request(
I &image_ctx = this->m_image_ctx;
bufferlist bl;
if (single_extent && object_extent.buffer_extents.size() == 1) {
if (single_extent && object_extent.buffer_extents.size() == 1 &&
m_bl.length() == object_extent.length) {
// optimization for single object/buffer extent writes
bl = std::move(m_bl);
} else {