137 lines
3.3 KiB
Rust
137 lines
3.3 KiB
Rust
#[cfg(test)]
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mod tests;
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use {
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crate::{
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io_uring::{
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pending_result::PendingResult,
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sys::{io_uring_sqe, IORING_OP_READ, IORING_OP_WRITE},
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IoUring, IoUringData, IoUringError, IoUringTaskId, Task, TaskResultExt,
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},
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time::Time,
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utils::on_drop::OnDrop,
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},
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uapi::{c, Fd},
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};
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impl IoUring {
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pub async fn read_no_cancel(
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&self,
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fd: Fd,
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offset: usize,
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buf: &mut [u8],
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cancel: impl FnOnce(IoUringTaskId),
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) -> Result<usize, IoUringError> {
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self.perform_no_cancel(
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fd,
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offset,
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buf.as_mut_ptr(),
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buf.len(),
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None,
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IORING_OP_READ,
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cancel,
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)
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.await
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}
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pub async fn write_no_cancel(
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&self,
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fd: Fd,
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offset: usize,
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buf: &[u8],
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timeout: Option<Time>,
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cancel: impl FnOnce(IoUringTaskId),
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) -> Result<usize, IoUringError> {
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self.perform_no_cancel(
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fd,
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offset,
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buf.as_ptr() as _,
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buf.len(),
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timeout,
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IORING_OP_WRITE,
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cancel,
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)
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.await
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}
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async fn perform_no_cancel(
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&self,
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fd: Fd,
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offset: usize,
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buf: *mut u8,
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len: usize,
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timeout: Option<Time>,
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opcode: u8,
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cancel: impl FnOnce(IoUringTaskId),
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) -> Result<usize, IoUringError> {
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self.ring.check_destroyed()?;
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let id = self.ring.id();
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let pr = self.ring.pending_results.acquire();
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{
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let mut pw = self
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.ring
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.cached_read_writes_no_cancel
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.pop()
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.unwrap_or_default();
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pw.opcode = opcode;
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pw.id = id.id;
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pw.has_timeout = timeout.is_some();
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pw.fd = fd.raw();
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pw.offset = offset;
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pw.buf = buf as _;
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pw.len = len;
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pw.data = Some(ReadWriteTaskData { res: pr.clone() });
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self.ring.schedule(pw);
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if let Some(time) = timeout {
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self.schedule_timeout_link(time);
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}
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}
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let panic = OnDrop(|| panic!("Operation cannot be cancelled from userspace"));
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cancel(id.id);
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let res = Ok(pr.await.map(|v| v as usize)).merge();
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panic.forget();
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res
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}
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}
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struct ReadWriteTaskData {
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res: PendingResult,
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}
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#[derive(Default)]
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pub struct ReadWriteNoCancelTask {
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id: IoUringTaskId,
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has_timeout: bool,
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fd: c::c_int,
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offset: usize,
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buf: usize,
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len: usize,
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data: Option<ReadWriteTaskData>,
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opcode: u8,
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}
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unsafe impl Task for ReadWriteNoCancelTask {
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fn id(&self) -> IoUringTaskId {
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self.id
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}
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fn complete(mut self: Box<Self>, ring: &IoUringData, res: i32) {
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if let Some(data) = self.data.take() {
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data.res.complete(res);
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}
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ring.cached_read_writes_no_cancel.push(self);
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}
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fn encode(&self, sqe: &mut io_uring_sqe) {
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sqe.opcode = self.opcode;
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sqe.fd = self.fd as _;
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sqe.u1.off = self.offset as _;
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sqe.u2.addr = self.buf as _;
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sqe.u3.rw_flags = 0;
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sqe.len = self.len as _;
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}
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fn has_timeout(&self) -> bool {
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self.has_timeout
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}
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}
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