Cleanup Redox repo, update Rust, remove old target

kernel/src/scheme/live.rs

@@ -0,0 +1,160 @@
+/// Disk scheme replacement when making live disk
+
+use alloc::arc::Arc;
+use collections::{BTreeMap, Vec};
+use core::cmp;
+use core::sync::atomic::{AtomicUsize, Ordering};
+use spin::RwLock;
+
+use syscall::data::Stat;
+use syscall::error::*;
+use syscall::flag::{MODE_FILE, SEEK_SET, SEEK_CUR, SEEK_END};
+use syscall::scheme::Scheme;
+
+static FILESYSTEM: &'static [u8] = include_bytes!("../../../build/filesystem.bin");
+
+struct Handle {
+    path: &'static [u8],
+    data: Arc<RwLock<Vec<u8>>>,
+    mode: u16,
+    seek: usize
+}
+
+pub struct DiskScheme {
+    next_id: AtomicUsize,
+    data: Arc<RwLock<Vec<u8>>>,
+    handles: RwLock<BTreeMap<usize, Handle>>
+}
+
+impl DiskScheme {
+    pub fn new() -> DiskScheme {
+        DiskScheme {
+            next_id: AtomicUsize::new(0),
+            data: Arc::new(RwLock::new(FILESYSTEM.to_vec())),
+            handles: RwLock::new(BTreeMap::new())
+        }
+    }
+}
+
+impl Scheme for DiskScheme {
+    fn open(&self, _path: &[u8], _flags: usize, _uid: u32, _gid: u32) -> Result<usize> {
+        let id = self.next_id.fetch_add(1, Ordering::SeqCst);
+        self.handles.write().insert(id, Handle {
+            path: b"0",
+            data: self.data.clone(),
+            mode: MODE_FILE | 0o744,
+            seek: 0
+        });
+
+        Ok(id)
+    }
+
+    fn dup(&self, id: usize, _buf: &[u8]) -> Result<usize> {
+        let (path, data, mode, seek) = {
+            let handles = self.handles.read();
+            let handle = handles.get(&id).ok_or(Error::new(EBADF))?;
+            (handle.path, handle.data.clone(), handle.mode, handle.seek)
+        };
+
+        let id = self.next_id.fetch_add(1, Ordering::SeqCst);
+        self.handles.write().insert(id, Handle {
+            path: path,
+            data: data,
+            mode: mode,
+            seek: seek
+        });
+
+        Ok(id)
+    }
+
+    fn read(&self, id: usize, buffer: &mut [u8]) -> Result<usize> {
+        let mut handles = self.handles.write();
+        let mut handle = handles.get_mut(&id).ok_or(Error::new(EBADF))?;
+        let data = handle.data.read();
+
+        let mut i = 0;
+        while i < buffer.len() && handle.seek < data.len() {
+            buffer[i] = data[handle.seek];
+            i += 1;
+            handle.seek += 1;
+        }
+
+        Ok(i)
+    }
+
+    fn write(&self, id: usize, buffer: &[u8]) -> Result<usize> {
+        let mut handles = self.handles.write();
+        let mut handle = handles.get_mut(&id).ok_or(Error::new(EBADF))?;
+        let mut data = handle.data.write();
+
+        let mut i = 0;
+        while i < buffer.len() && handle.seek < data.len() {
+            data[handle.seek] = buffer[i];
+            i += 1;
+            handle.seek += 1;
+        }
+
+        Ok(i)
+    }
+
+    fn seek(&self, id: usize, pos: usize, whence: usize) -> Result<usize> {
+        let mut handles = self.handles.write();
+        let mut handle = handles.get_mut(&id).ok_or(Error::new(EBADF))?;
+        let data = handle.data.read();
+
+        handle.seek = match whence {
+            SEEK_SET => cmp::min(data.len(), pos),
+            SEEK_CUR => cmp::max(0, cmp::min(data.len() as isize, handle.seek as isize + pos as isize)) as usize,
+            SEEK_END => cmp::max(0, cmp::min(data.len() as isize, data.len() as isize + pos as isize)) as usize,
+            _ => return Err(Error::new(EINVAL))
+        };
+
+        Ok(handle.seek)
+    }
+
+    fn fpath(&self, id: usize, buf: &mut [u8]) -> Result<usize> {
+        let handles = self.handles.read();
+        let handle = handles.get(&id).ok_or(Error::new(EBADF))?;
+
+        //TODO: Copy scheme part in kernel
+        let mut i = 0;
+        let scheme_path = b"disk:";
+        while i < buf.len() && i < scheme_path.len() {
+            buf[i] = scheme_path[i];
+            i += 1;
+        }
+
+        let mut j = 0;
+        while i < buf.len() && j < handle.path.len() {
+            buf[i] = handle.path[j];
+            i += 1;
+            j += 1;
+        }
+
+        Ok(i)
+    }
+
+    fn fstat(&self, id: usize, stat: &mut Stat) -> Result<usize> {
+        let handles = self.handles.read();
+        let handle = handles.get(&id).ok_or(Error::new(EBADF))?;
+        let data = handle.data.read();
+
+        stat.st_mode = handle.mode;
+        stat.st_uid = 0;
+        stat.st_gid = 0;
+        stat.st_size = data.len() as u64;
+
+        Ok(0)
+    }
+
+    fn fsync(&self, id: usize) -> Result<usize> {
+        let handles = self.handles.read();
+        let _handle = handles.get(&id).ok_or(Error::new(EBADF))?;
+
+        Ok(0)
+    }
+
+    fn close(&self, id: usize) -> Result<usize> {
+        self.handles.write().remove(&id).ok_or(Error::new(EBADF)).and(Ok(0))
+    }
+}