[v21.11.x] bytes: impose max chunk size on ss_next_allocation_size #3472
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This is the helper for iobuf_copy, that previously would attempt to allocate huge contiguous extents when copying large iobufs. Make it respect the same max_chunk_size as iobuf append/reserve operations, to avoid bad_allocs when copying large buffers under memory pressure. Fixes: redpanda-data#3428 Signed-off-by: John Spray <jcs@vectorized.io> (cherry picked from commit a9a7a3e)
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Cover letter
Backport of #3435
Fixes: #3428
Release notes
Improvements