bjorn3
402 lines
14 KiB
Rust
402 lines
14 KiB
Rust
//! Filesystem syscalls
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use alloc::sync::Arc;
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use spin::RwLock;
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use crate::context::file::{FileDescriptor, FileDescription};
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use crate::context::memory::AddrSpace;
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use crate::context;
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use crate::memory::PAGE_SIZE;
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use crate::scheme::{self, FileHandle, OpenResult, current_caller_ctx, KernelScheme, SchemeId};
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use crate::syscall::data::Stat;
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use crate::syscall::error::*;
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use crate::syscall::flag::*;
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use crate::syscall::scheme::CallerCtx;
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use super::usercopy::{UserSlice, UserSliceWo, UserSliceRo};
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/*pub fn file_op(a: usize, fd: FileHandle, c: usize, d: usize) -> Result<usize> {
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let (file, pid, uid, gid) = {
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let contexts = context::contexts();
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let context_lock = contexts.current().ok_or(Error::new(ESRCH))?;
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let context = context_lock.read();
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let file = context.get_file(fd).ok_or(Error::new(EBADF))?;
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(file, context.id, context.euid, context.egid)
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};
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let scheme = {
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let schemes = scheme::schemes();
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let scheme = schemes.get(file.description.read().scheme).ok_or(Error::new(EBADF))?;
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Arc::clone(scheme)
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};
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let mut packet = Packet {
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id: 0,
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pid: pid.into(),
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uid,
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gid,
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a,
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b: file.description.read().number,
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c,
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d
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};
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scheme.handle(&mut packet);
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Error::demux(packet.a)
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}*/
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pub fn file_op_generic<T>(fd: FileHandle, op: impl FnOnce(&dyn KernelScheme, &CallerCtx, usize) -> Result<T>) -> Result<T> {
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file_op_generic_ext(fd, |s, _, ctx, no| op(s, ctx, no))
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}
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pub fn file_op_generic_ext<T>(fd: FileHandle, op: impl FnOnce(&dyn KernelScheme, SchemeId, &CallerCtx, usize) -> Result<T>) -> Result<T> {
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let (ctx, file) = match context::current()?.read() {
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ref context => (CallerCtx { pid: context.id.into(), uid: context.euid, gid: context.egid }, context.get_file(fd).ok_or(Error::new(EBADF))?),
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};
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let FileDescription { scheme: scheme_id, number, .. } = *file.description.read();
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let scheme = Arc::clone(scheme::schemes().get(scheme_id).ok_or(Error::new(EBADF))?);
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op(&*scheme, scheme_id, &ctx, number)
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}
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pub fn copy_path_to_buf(raw_path: UserSliceRo, max_len: usize) -> Result<alloc::string::String> {
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let mut path_buf = vec! [0_u8; max_len];
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if raw_path.len() > path_buf.len() {
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return Err(Error::new(ENAMETOOLONG));
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}
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let path_len = raw_path.copy_common_bytes_to_slice(&mut path_buf)?;
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path_buf.truncate(path_len);
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alloc::string::String::from_utf8(path_buf).map_err(|_| Error::new(EINVAL))
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//core::str::from_utf8(&path_buf[..path_len]).map_err(|_| Error::new(EINVAL))
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}
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// TODO: Define elsewhere
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const PATH_MAX: usize = PAGE_SIZE;
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/// Open syscall
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pub fn open(raw_path: UserSliceRo, flags: usize) -> Result<FileHandle> {
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let (pid, uid, gid, scheme_ns, umask) = match context::current()?.read() {
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ref context => (context.id.into(), context.euid, context.egid, context.ens, context.umask),
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};
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let flags = (flags & (!0o777)) | ((flags & 0o777) & (!(umask & 0o777)));
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// TODO: BorrowedHtBuf!
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/*
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let mut path_buf = BorrowedHtBuf::head()?;
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let path = path_buf.use_for_string(raw_path)?;
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*/
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let path = copy_path_to_buf(raw_path, PATH_MAX)?;
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let mut parts = path.splitn(2, ':');
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let scheme_name = parts.next().ok_or(Error::new(EINVAL))?;
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let reference = parts.next().unwrap_or("");
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let description = {
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let (scheme_id, scheme) = {
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let schemes = scheme::schemes();
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let (scheme_id, scheme) = schemes.get_name(scheme_ns, scheme_name).ok_or(Error::new(ENODEV))?;
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(scheme_id, Arc::clone(scheme))
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};
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match scheme.kopen(reference, flags, CallerCtx { uid, gid, pid })? {
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OpenResult::SchemeLocal(number) => Arc::new(RwLock::new(FileDescription {
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namespace: scheme_ns,
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scheme: scheme_id,
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number,
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flags: flags & !O_CLOEXEC,
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})),
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OpenResult::External(desc) => desc,
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}
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};
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//drop(path_buf);
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context::current()?.read().add_file(FileDescriptor {
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description,
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cloexec: flags & O_CLOEXEC == O_CLOEXEC,
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}).ok_or(Error::new(EMFILE))
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}
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pub fn pipe2(fds: UserSliceWo, flags: usize) -> Result<()> {
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let scheme_id = crate::scheme::pipe::pipe_scheme_id();
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let (read_id, write_id) = crate::scheme::pipe::pipe(flags)?;
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let context_lock = context::current()?;
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let context = context_lock.read();
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//log::warn!("Context {} used deprecated pipe2.", context.name);
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let read_fd = context.add_file(FileDescriptor {
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description: Arc::new(RwLock::new(FileDescription {
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namespace: context.ens,
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scheme: scheme_id,
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number: read_id,
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flags: O_RDONLY | flags & !O_ACCMODE & !O_CLOEXEC,
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})),
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cloexec: flags & O_CLOEXEC == O_CLOEXEC,
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}).ok_or(Error::new(EMFILE))?;
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let write_fd = context.add_file(FileDescriptor {
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description: Arc::new(RwLock::new(FileDescription {
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namespace: context.ens,
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scheme: scheme_id,
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number: write_id,
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flags: O_WRONLY | flags & !O_ACCMODE & !O_CLOEXEC,
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})),
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cloexec: flags & O_CLOEXEC == O_CLOEXEC,
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}).ok_or(Error::new(EMFILE))?;
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let (read_outptr, write_outptr) = fds.split_at(core::mem::size_of::<usize>()).ok_or(Error::new(EINVAL))?;
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read_outptr.write_usize(read_fd.into())?;
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write_outptr.write_usize(write_fd.into())
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}
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/// rmdir syscall
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pub fn rmdir(raw_path: UserSliceRo) -> Result<usize> {
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let (uid, gid, scheme_ns) = match context::current()?.read() {
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ref context => (context.euid, context.egid, context.ens),
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};
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/*
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let mut path_buf = BorrowedHtBuf::head()?;
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let path = path_buf.use_for_string(raw_path)?;
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*/
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let path = copy_path_to_buf(raw_path, PATH_MAX)?;
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let mut parts = path.splitn(2, ':');
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let scheme_name = parts.next().ok_or(Error::new(EINVAL))?;
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let reference = parts.next().unwrap_or("");
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let scheme = {
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let schemes = scheme::schemes();
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let (_scheme_id, scheme) = schemes.get_name(scheme_ns, scheme_name).ok_or(Error::new(ENODEV))?;
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Arc::clone(scheme)
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};
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scheme.rmdir(reference, uid, gid)
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}
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/// Unlink syscall
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pub fn unlink(raw_path: UserSliceRo) -> Result<usize> {
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let (uid, gid, scheme_ns) = match context::current()?.read() {
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ref context => (context.euid, context.egid, context.ens),
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};
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/*
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let mut path_buf = BorrowedHtBuf::head()?;
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let path = path_buf.use_for_string(raw_path)?;
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*/
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let path = copy_path_to_buf(raw_path, PATH_MAX)?;
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let mut parts = path.splitn(2, ':');
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let scheme_name = parts.next().ok_or(Error::new(EINVAL))?;
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let reference = parts.next().unwrap_or("");
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let scheme = {
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let schemes = scheme::schemes();
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let (_scheme_id, scheme) = schemes.get_name(scheme_ns, scheme_name).ok_or(Error::new(ENODEV))?;
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Arc::clone(scheme)
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};
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scheme.unlink(reference, uid, gid)
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}
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/// Close syscall
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pub fn close(fd: FileHandle) -> Result<usize> {
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let file = {
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let contexts = context::contexts();
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let context_lock = contexts.current().ok_or(Error::new(ESRCH))?;
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let context = context_lock.read();
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context.remove_file(fd).ok_or(Error::new(EBADF))?
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};
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file.close()
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}
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fn duplicate_file(fd: FileHandle, user_buf: UserSliceRo) -> Result<FileDescriptor> {
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let file = context::current()?.read()
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.get_file(fd).ok_or(Error::new(EBADF))?;
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if user_buf.is_empty() {
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Ok(FileDescriptor {
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description: Arc::clone(&file.description),
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cloexec: false,
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})
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} else {
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let description = file.description.read();
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let new_description = {
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let scheme = {
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let schemes = scheme::schemes();
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let scheme = schemes.get(description.scheme).ok_or(Error::new(EBADF))?;
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Arc::clone(scheme)
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};
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match scheme.kdup(description.number, user_buf, current_caller_ctx()?)? {
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OpenResult::SchemeLocal(number) => Arc::new(RwLock::new(FileDescription {
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namespace: description.namespace,
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scheme: description.scheme,
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number,
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flags: description.flags,
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})),
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OpenResult::External(desc) => desc,
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}
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};
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Ok(FileDescriptor {
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description: new_description,
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cloexec: false,
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})
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}
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}
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/// Duplicate file descriptor
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pub fn dup(fd: FileHandle, buf: UserSliceRo) -> Result<FileHandle> {
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let new_file = duplicate_file(fd, buf)?;
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context::current()?.read().add_file(new_file).ok_or(Error::new(EMFILE))
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}
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/// Duplicate file descriptor, replacing another
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pub fn dup2(fd: FileHandle, new_fd: FileHandle, buf: UserSliceRo) -> Result<FileHandle> {
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if fd == new_fd {
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Ok(new_fd)
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} else {
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let _ = close(new_fd);
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let new_file = duplicate_file(fd, buf)?;
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let contexts = context::contexts();
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let context_lock = contexts.current().ok_or(Error::new(ESRCH))?;
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let context = context_lock.read();
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context.insert_file(new_fd, new_file).ok_or(Error::new(EMFILE))
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}
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}
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/// File descriptor controls
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pub fn fcntl(fd: FileHandle, cmd: usize, arg: usize) -> Result<usize> {
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let file = {
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let contexts = context::contexts();
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let context_lock = contexts.current().ok_or(Error::new(ESRCH))?;
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let context = context_lock.read();
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context.get_file(fd).ok_or(Error::new(EBADF))?
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};
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let description = file.description.read();
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// Communicate fcntl with scheme
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if cmd != F_DUPFD && cmd != F_GETFD && cmd != F_SETFD {
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let scheme = {
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let schemes = scheme::schemes();
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let scheme = schemes.get(description.scheme).ok_or(Error::new(EBADF))?;
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Arc::clone(scheme)
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};
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scheme.fcntl(description.number, cmd, arg)?;
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};
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// Perform kernel operation if scheme agrees
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{
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if cmd == F_DUPFD {
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// Not in match because 'files' cannot be locked
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let new_file = duplicate_file(fd, UserSlice::empty())?;
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let contexts = context::contexts();
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let context_lock = contexts.current().ok_or(Error::new(ESRCH))?;
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let context = context_lock.read();
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return context.add_file_min(new_file, arg)
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.ok_or(Error::new(EMFILE))
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.map(FileHandle::into);
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}
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let contexts = context::contexts();
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let context_lock = contexts.current().ok_or(Error::new(ESRCH))?;
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let context = context_lock.read();
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let mut files = context.files.write();
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match *files.get_mut(fd.into()).ok_or(Error::new(EBADF))? {
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Some(ref mut file) => match cmd {
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F_GETFD => {
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if file.cloexec {
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Ok(O_CLOEXEC)
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} else {
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Ok(0)
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}
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},
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F_SETFD => {
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file.cloexec = arg & O_CLOEXEC == O_CLOEXEC;
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Ok(0)
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},
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F_GETFL => {
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Ok(description.flags)
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},
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F_SETFL => {
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let new_flags = (description.flags & O_ACCMODE) | (arg & ! O_ACCMODE);
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drop(description);
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file.description.write().flags = new_flags;
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Ok(0)
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},
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_ => {
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Err(Error::new(EINVAL))
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}
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},
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None => Err(Error::new(EBADF))
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}
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}
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}
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pub fn frename(fd: FileHandle, raw_path: UserSliceRo) -> Result<usize> {
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let (file, uid, gid, scheme_ns) = match context::current()?.read() {
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ref context => (context.get_file(fd).ok_or(Error::new(EBADF))?, context.euid, context.egid, context.ens),
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};
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/*
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let mut path_buf = BorrowedHtBuf::head()?;
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let path = path_buf.use_for_string(raw_path)?;
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*/
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let path = copy_path_to_buf(raw_path, PATH_MAX)?;
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let mut parts = path.splitn(2, ':');
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let scheme_name = parts.next().ok_or(Error::new(ENOENT))?;
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let reference = parts.next().unwrap_or("");
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let (scheme_id, scheme) = {
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let schemes = scheme::schemes();
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let (scheme_id, scheme) = schemes.get_name(scheme_ns, scheme_name).ok_or(Error::new(ENODEV))?;
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(scheme_id, scheme.clone())
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};
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let description = file.description.read();
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if scheme_id == description.scheme {
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scheme.frename(description.number, reference, uid, gid)
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} else {
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Err(Error::new(EXDEV))
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}
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}
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/// File status
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pub fn fstat(fd: FileHandle, user_buf: UserSliceWo) -> Result<usize> {
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file_op_generic_ext(fd, |scheme, scheme_id, _, number| {
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scheme.kfstat(number, user_buf)?;
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// TODO: Ensure only the kernel can access the stat when st_dev is set, or use another API
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// for retrieving the scheme ID from a file descriptor.
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// TODO: Less hacky method.
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let st_dev = scheme_id.into().try_into().map_err(|_| Error::new(EOVERFLOW))?;
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user_buf.advance(memoffset::offset_of!(Stat, st_dev)).and_then(|b| b.limit(8)).ok_or(Error::new(EIO))?.copy_from_slice(&u64::to_ne_bytes(st_dev))?;
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Ok(0)
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})
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}
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pub fn funmap(virtual_address: usize, length: usize) -> Result<usize> {
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let length_aligned = length.next_multiple_of(PAGE_SIZE);
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if length != length_aligned {
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log::warn!("funmap passed length {:#x} instead of {:#x}", length, length_aligned);
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}
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let (page, page_count) = crate::syscall::validate_region(virtual_address, length_aligned)?;
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let addr_space = Arc::clone(context::current()?.read().addr_space()?);
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AddrSpace::munmap(addr_space.write(), page, page_count);
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Ok(0)
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}
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