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Andres Freund 50cb7505b3 aio: Implement support for reads in smgr/md/fd ... This implements the following: 1) An smgr AIO target, for AIO on smgr files. This should be usable not just for md.c but also other SMGR implementation if we ever get them. 2) readv support in fd.c, which requires a small bit of infrastructure work in fd.c 3) smgr.c and md.c support for readv There still is nothing performing AIO, but as of this commit it would be possible. As part of this change FileGetRawDesc() actually ensures that the file is opened - previously it was basically not usable. It's used to reopen a file in IO workers. Reviewed-by: Noah Misch <noah@leadboat.com> Discussion: https://postgr.es/m/uvrtrknj4kdytuboidbhwclo4gxhswwcpgadptsjvjqcluzmah%40brqs62irg4dt Discussion: https://postgr.es/m/20210223100344.llw5an2aklengrmn@alap3.anarazel.de Discussion: https://postgr.es/m/stj36ea6yyhoxtqkhpieia2z4krnam7qyetc57rfezgk4zgapf@gcnactj4z56m		9 months ago
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Makefile	aio: Add io_method=io_uring	9 months ago
aio.c	aio: Add io_method=io_uring	9 months ago
aio_callback.c	aio: Implement support for reads in smgr/md/fd	9 months ago
aio_init.c	aio: Change prefix of PgAioResultStatus values to PGAIO_RS_	10 months ago
aio_io.c	aio: Add io_method=io_uring	9 months ago
aio_target.c	aio: Implement support for reads in smgr/md/fd	9 months ago
meson.build	aio: Add io_method=io_uring	9 months ago
method_io_uring.c	aio: Add io_method=io_uring	9 months ago
method_sync.c	aio: Add core asynchronous I/O infrastructure	10 months ago
method_worker.c	aio: Be more paranoid about interrupts	9 months ago
read_stream.c	Support buffer forwarding in read_stream.c.	10 months ago