The io context determines the snapshot to read from, if any was set
by rados_ioctx_snap_set_read().
@param io the context in which to perform the read
@param oid the name of the object to read from
@param buf where to store the results
@param len the number of bytes to read
@param off the offset to start reading from in the object
@returns number of bytes read on success, negative error code on
failure
Read data from an object
The io context determines the snapshot to read from, if any was set by rados_ioctx_snap_set_read().
@param io the context in which to perform the read @param oid the name of the object to read from @param buf where to store the results @param len the number of bytes to read @param off the offset to start reading from in the object @returns number of bytes read on success, negative error code on failure