| Fsync | File sync. See also fsync(2).
Note that, while I/O is initiated in the order in which it appears in the submission queue, completions are unordered.
For example, an application which places a write I/O followed by an fsync in the submission queue cannot expect the fsync to apply to the write. The two operations execute in parallel, so the fsync may complete before the write is issued to the storage. The same is also true for previously issued writes that have not completed prior to the fsync.
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| KernelTimespec | |
| Nop | Do not perform any I/O.
This is useful for testing the performance of the io_uring implementation itself.
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| PollAdd | Poll the fd specified in the submission queue entry for the events specified in the poll_events field.
Unlike poll or epoll without EPOLLONESHOT, this interface always works in one shot mode.
That is, once the poll operation is completed, it will have to be resubmitted.
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| PollRemove | Remove an existing poll request.
If found, the result method of the cqueue::Entry will return 0.
If not found, result will return -libc::ENOENT.
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| ReadFixed | Read from pre-mapped buffers.
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| Readv | Vectored read operations, similar to preadv2 (2).
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| RecvMsg | |
| SendMsg | |
| SyncFileRange | |
| Timeout | |
| WriteFixed | Write to pre-mapped buffers.
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| Writev | Vectored write operations, similar to pwritev2 (2).
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