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Async I/O (syscalls 245 - 249)#1584

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kmeisthax wants to merge 34 commits intoish-app:masterish-app/ish:masterfrom kmeisthax:linux_aiokmeisthax/ish:linux_aioCopy head branch name to clipboard

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Commits on Nov 14, 2021

• Individually stub each AIO syscall

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• Add a structure in the task for AIO contexts to live in.

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• Implement io_setup

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• Implement io_destroy.

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• Store the owning PID of each AIO context, so that resolved requests can access allocated memory in the guest.

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• Elaborate on the event structure to be able to hold pending requests, too.

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• Add method for submitting a pending event.

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• Add functions for retrieving pending events from a context.

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• Add AIO syscalls to systrace

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• Add aioctx table method for retrieving (and retaining) a context by it's ID.

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• Half-implement io_submit.

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• Add aioctx_cancel_event & other documentation fixes

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• Add io_submit op so that FDs can handle asynchronous operations.

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• Add method to complete pending events.

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• Add fallback for filesystems that don't yet implement true async I/O.

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• Submitted events must retain the guest address of the IOCB structure the event came from.

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• Implement completion polling (io_getevents)

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• Everything except io_setup takes a context ID directly, not a pointer to one

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• Properly initialize the lock and refcount in AIO contexts.

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• Fix a bunch of bounds checks

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• Always NULL out contexts in the task context table when removing them from it.

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• Add E2E test for AIO read and write.

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• Don't specify an enum impl type because gcc doesn't support that C gitextension.

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• In fallback code, treat FDSYNC as a full FSYNC.

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• Pull the pread/pwrite emulation code out into separate functions.

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• Add E2E test for vectored async IO

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• Implement vectored async IO fallback

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• Fix incorrect/spurious failure on seeking to non-zero offsets

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• Remove implicit coercions in tests so that they don't sign-extend things they shouldn't

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Commits on Nov 21, 2021

• Add a condition variable for waiting on events, and wait for it to be signalled if min_nr hasn't been reached

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• Formatting & consistency nits

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• Rip out and replace the AIO_IOCB_ family of constants with a host structure and static asserts

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• Also rip out the AIO_IO_EVENT constants for another host-compiled structure and static asserts.

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• Remove e2e tests dependency on linux/aio_abi.h header

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