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Allow LIO_READV and LIO_WRITEV in lio_listio().

Authored by tmunro on Aug 21 2021, 3:07 AM.
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Allow multiple vector IOs to be started with one system call. The aio_readv() and aio_writev() functions already used the same code as lio_listio() under the covers. This commit just exposes the formerly internal-only LIO_READV and LIO_WRITEV opcodes to user space.

The new opcode are only visible to user space if __BSD_VISIBLE is defined, being extensions to POSIX, just like the aio_readv() and aio_writev() functions.

The other obvious candidate is LIO_SYNC, but that involves answering some tricky questions about dependencies and is left for later.

I subscribed the reviewers of D27743 (aio_readv() and aio_writev()).

Test Plan

A simple kyua test is included.

Diff Detail

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Event Timeline

tmunro created this revision.

Reuploaded patch with -U99999, no change.

asomers requested changes to this revision.Aug 21 2021, 4:23 AM

Don't forget to bump the date in the man page.


The ftruncate is not necessary, since Kyua will always run the test in a brand-new directory.

This revision now requires changes to proceed.Aug 21 2021, 4:23 AM
tmunro marked an inline comment as done.
This revision is now accepted and ready to land.Aug 21 2021, 1:25 PM