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use std::cmp::min;
use std::convert::TryFrom;
use std::fs::File as StdFile;
use std::io;
use std::path::Path;
use std::sync::Arc;
use base::AsRawDescriptor;
use base::SafeDescriptor;
use super::io_driver;
use crate::AsIoBufs;
use crate::OwnedIoBuf;
#[derive(Debug)]
pub struct File {
fd: Arc<SafeDescriptor>,
}
impl File {
pub fn open<P: AsRef<Path>>(p: P) -> anyhow::Result<File> {
let f = StdFile::open(p)?;
File::try_from(f)
}
pub fn create<P: AsRef<Path>>(p: P) -> anyhow::Result<File> {
let f = StdFile::create(p)?;
File::try_from(f)
}
pub async fn read(&self, buf: &mut [u8], offset: Option<u64>) -> anyhow::Result<usize> {
io_driver::read(&self.fd, buf, offset).await
}
pub async fn read_iobuf<B: AsIoBufs + Unpin + 'static>(
&self,
buf: B,
offset: Option<u64>,
) -> (anyhow::Result<usize>, B) {
io_driver::read_iobuf(&self.fd, buf, offset).await
}
pub async fn write(&self, buf: &[u8], offset: Option<u64>) -> anyhow::Result<usize> {
io_driver::write(&self.fd, buf, offset).await
}
pub async fn write_iobuf<B: AsIoBufs + Unpin + 'static>(
&self,
buf: B,
offset: Option<u64>,
) -> (anyhow::Result<usize>, B) {
io_driver::write_iobuf(&self.fd, buf, offset).await
}
pub async fn punch_hole(&self, offset: u64, len: u64) -> anyhow::Result<()> {
io_driver::fallocate(
&self.fd,
offset,
len,
(libc::FALLOC_FL_PUNCH_HOLE | libc::FALLOC_FL_KEEP_SIZE) as u32,
)
.await
}
pub async fn write_zeroes(&self, offset: u64, len: u64) -> anyhow::Result<()> {
let res = io_driver::fallocate(
&self.fd,
offset,
len,
(libc::FALLOC_FL_ZERO_RANGE | libc::FALLOC_FL_KEEP_SIZE) as u32,
)
.await;
match res {
Ok(()) => Ok(()),
Err(_) => {
let buf_size = min(len, 0x10000);
let mut buf = OwnedIoBuf::new(vec![0u8; buf_size as usize]);
let mut nwritten = 0;
while nwritten < len {
buf.reset();
let remaining = len - nwritten;
let write_size = min(remaining, buf_size) as usize;
buf.truncate(write_size);
let (res, b) = self.write_iobuf(buf, Some(offset + nwritten as u64)).await;
nwritten += res? as u64;
buf = b;
}
Ok(())
}
}
}
pub async fn allocate(&self, offset: u64, len: u64) -> anyhow::Result<()> {
io_driver::fallocate(&self.fd, offset, len, 0).await
}
pub async fn get_len(&self) -> anyhow::Result<u64> {
io_driver::stat(&self.fd).await.map(|st| st.st_size as u64)
}
pub async fn set_len(&self, len: u64) -> anyhow::Result<()> {
io_driver::ftruncate(&self.fd, len).await
}
pub async fn sync_all(&self) -> anyhow::Result<()> {
io_driver::fsync(&self.fd, false).await
}
pub async fn sync_data(&self) -> anyhow::Result<()> {
io_driver::fsync(&self.fd, true).await
}
pub fn try_clone(&self) -> anyhow::Result<File> {
self.fd
.try_clone()
.map(|fd| File { fd: Arc::new(fd) })
.map_err(io::Error::from)
.map_err(From::from)
}
}
impl TryFrom<StdFile> for File {
type Error = anyhow::Error;
fn try_from(f: StdFile) -> anyhow::Result<Self> {
io_driver::prepare(&f)?;
Ok(File {
fd: Arc::new(f.into()),
})
}
}
impl TryFrom<File> for StdFile {
type Error = File;
fn try_from(f: File) -> Result<StdFile, File> {
Arc::try_unwrap(f.fd)
.map(From::from)
.map_err(|fd| File { fd })
}
}
impl AsRawDescriptor for File {
fn as_raw_descriptor(&self) -> base::RawDescriptor {
self.fd.as_raw_descriptor()
}
}
