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Replace ftruncate/ftruncate64 with a simple set_len() call (#1961)

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Ignotus Peverell 2018-11-13 09:31:43 -08:00 committed by GitHub
commit 5fb8b4764f
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1 changed files with 2 additions and 19 deletions
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21
store/src/types.rs
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@ -17,14 +17,8 @@ use memmap;
use std::cmp;
use std::fs::{self, File, OpenOptions};
use std::io::{self, BufRead, BufReader, BufWriter, ErrorKind, Read, Write};
use std::os::unix::io::AsRawFd;
use std::path::Path;
#[cfg(not(any(target_os = "linux", target_os = "android")))]
use libc::{ftruncate as ftruncate64, off_t as off64_t};
#[cfg(any(target_os = "linux"))]
use libc::{ftruncate64, off64_t};
use core::core::hash::Hash;
use core::ser::{self, FixedLength};
@ -189,8 +183,8 @@ impl AppendOnlyFile {
/// written data accessible.
pub fn flush(&mut self) -> io::Result<()> {
if self.buffer_start_bak > 0 {
// flushing a rewound state, we need to truncate before applying
self.truncate(self.buffer_start)?;
// Flushing a rewound state, we need to truncate via set_len() before applying.
self.file.set_len(self.buffer_start as u64)?;
self.buffer_start_bak = 0;
}
@ -256,17 +250,6 @@ impl AppendOnlyFile {
}
}
/// Truncates the underlying file to the provided offset
pub fn truncate(&self, offs: usize) -> io::Result<()> {
let fd = self.file.as_raw_fd();
let res = unsafe { ftruncate64(fd, offs as off64_t) };
if res == -1 {
Err(io::Error::last_os_error())
} else {
Ok(())
}
}
/// Saves a copy of the current file content, skipping data at the provided
/// prune indices. The prune Vec must be ordered.
pub fn save_prune<T>(