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extern int block_get_bsize(devmap_handle_t, size_t *);
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extern int block_get_nblocks(devmap_handle_t, aoff64_t *);
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extern int block_read_direct(devmap_handle_t, aoff64_t, size_t, void *);
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extern int block_read_bytes_direct(devmap_handle_t, aoff64_t, size_t, void *);
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extern int block_write_direct(devmap_handle_t, aoff64_t, size_t, const void *);