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Feature #49457
openadd copy offload into libcephfs
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Client, libcephfs
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Description
The kclient has a copy_file_range implementation that uses a COPY2 OSD command to tell the OSD to copy data to a different object within the same cluster. Add a similar mechanism to libcephfs, which would allow us to eventually wire up server-side copies in ganesha's FSAL_CEPH. It would probably also be helpful to have a
Note that ganesha has no support for the NFS COPY commands yet, so that also needs to be done to take advantage of this there. That's a separate project however.
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