Adjust operation names of pg_aios to match the documentation
pg_aios used the terms "read" and "write" for vectored I/O read and
write operations, respectively. The documentation refers to them as
"readv" and "writev", and the code uses internally the terms
PGAIO_OP_READV and PGAIO_OP_WRITEV for them, as of "vectored".
This commit adjusts these operation names to match with the code and the
documentation.
Oversight in
8e293e689bab.
Author: Atsushi Torikoshi <torikoshia@oss.nttdata.com>
Discussion: https://postgr.es/m/
6df1e949d1d759ad2767c18e5845963e@oss.nttdata.com