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noop(VirtualFile): read_exact_at: actually vendor the rust std version

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Apart from sticking closer to the comment above the function,
this reduces the diff in the next patch.
This commit is contained in:
Christian Schwarz
2024-01-12 10:00:02 +00:00
parent 1a70c9e8ee
commit 05ef8a4b29
1 changed files with 12 additions and 9 deletions
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21
pageserver/src/virtual_file.rs
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@@ -509,24 +509,27 @@ impl VirtualFile {
}
// Copied from https://doc.rust-lang.org/1.72.0/src/std/os/unix/fs.rs.html#117-135
pub async fn read_exact_at(&self, mut buf: &mut [u8], mut offset: u64) -> Result<(), Error> {
pub async fn read_exact_at(&self, mut buf: &mut [u8], mut offset: u64) -> std::io::Result<()> {
while !buf.is_empty() {
match self.read_at(buf, offset).await {
Ok(0) => {
return Err(Error::new(
std::io::ErrorKind::UnexpectedEof,
"failed to fill whole buffer",
))
}
Ok(0) => break,
Ok(n) => {
buf = &mut buf[n..];
let tmp = buf;
buf = &mut tmp[n..];
offset += n as u64;
}
Err(ref e) if e.kind() == std::io::ErrorKind::Interrupted => {}
Err(e) => return Err(e),
}
}
Ok(())
if !buf.is_empty() {
Err(std::io::Error::new(
std::io::ErrorKind::UnexpectedEof,
"failed to fill whole buffer",
))
} else {
Ok(())
}
}
// Copied from https://doc.rust-lang.org/1.72.0/src/std/os/unix/fs.rs.html#219-235