tools/rados: reduce "rados put" memory usage by op_size #7928
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indata.append(char*, len) causes buffer "buf" to be physically copied
to new memory block. Make static buffer pointing to buf so we don't need
any intermediate copies. This reduces memory usage by op_size, and also
cpu usage by a bit (no memmove necessary).
Signed-off-by: Piotr Dałek piotr.dalek@ts.fujitsu.com