[DragonFlyBSD - Bug #3364] aio_read2() and aio_write2()

[jpipkin]

Issue #3364 has been updated by jpipkin.


This would need an actual implementation of aio 1st. DragonFly has only the interface, not the functionality; the aio syscalls are all no-ops and the aio stuff in librt just wraps synchronous IO calls.

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Bug #3364: aio_read2() and aio_write2()
http://bugs.dragonflybsd.org/issues/3364#change-14681

* Author: vinipsmaker
* Status: New
* Priority: Normal
* Target version: 6.6
* Start date: 2023-12-23
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I'd like to use AIO to read files w/o specifying an offset in the member aio_offset. Instead, I'd like for the current file offset to be used. For Linux, io_uring supports using -1 for the offset to indicate that the current file position should be used instead of passing in an explicit offset. I'd like to do the same on DragonFly BSD.

I propose the following interface:

int aio_read2(struct aiocb *iocb, unsigned flags);
int aio_write2(struct	aiocb *iocb, unsigned flags);

aio_read(iocb) would be equivalent to aio_read2(iocb, 0) and aio_write(iocb) would be equivalent to aio_write2(iocb, 0).

Then we would define the following flags:

AIO_IGNOREOFFSET

The flag AIO_IGNOREOFFSET would instruct the call to ignore aio_offset in aiocb and use the file position (lseek) if applicable. The flag AIO_IGNOREOFFSET should not conflict with LIO opcodes so one could OR it into aio_lio_opcode for usage with lio_listio() as well. I think that should be enough to close all ties.



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