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Minimize locking in schemes. Reenable pcid and ion launch in init. WIP: Userspace schemes

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This commit is contained in:
Jeremy Soller 2016-09-19 18:29:28 -06:00
parent 94ad63de11
commit abdbadfea3
9 changed files with 367 additions and 113 deletions
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109
kernel/syscall/fs.rs
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@ -5,6 +5,7 @@ use scheme;
use super::{Error, Result};
/// Change the current working directory
pub fn chdir(path: &[u8]) -> Result<usize> {
let contexts = context::contexts();
let context_lock = contexts.current().ok_or(Error::NoProcess)?;
@ -14,6 +15,7 @@ pub fn chdir(path: &[u8]) -> Result<usize> {
Ok(0)
}
/// Get the current working directory
pub fn getcwd(buf: &mut [u8]) -> Result<usize> {
let contexts = context::contexts();
let context_lock = contexts.current().ok_or(Error::NoProcess)?;
@ -27,38 +29,6 @@ pub fn getcwd(buf: &mut [u8]) -> Result<usize> {
Ok(i)
}
/// Read syscall
pub fn read(fd: usize, buf: &mut [u8]) -> Result<usize> {
let file = {
let contexts = context::contexts();
let context_lock = contexts.current().ok_or(Error::NoProcess)?;
let context = context_lock.read();
let file = context.get_file(fd).ok_or(Error::BadFile)?;
file
};
let schemes = scheme::schemes();
let scheme_mutex = schemes.get(file.scheme).ok_or(Error::BadFile)?;
let result = scheme_mutex.lock().read(file.number, buf);
result
}
/// Write syscall
pub fn write(fd: usize, buf: &[u8]) -> Result<usize> {
let file = {
let contexts = context::contexts();
let context_lock = contexts.current().ok_or(Error::NoProcess)?;
let context = context_lock.read();
let file = context.get_file(fd).ok_or(Error::BadFile)?;
file
};
let schemes = scheme::schemes();
let scheme_mutex = schemes.get(file.scheme).ok_or(Error::BadFile)?;
let result = scheme_mutex.lock().write(file.number, buf);
result
}
/// Open syscall
pub fn open(path: &[u8], flags: usize) -> Result<usize> {
let path_canon = {
@ -74,9 +44,12 @@ pub fn open(path: &[u8], flags: usize) -> Result<usize> {
let (scheme_id, file_id) = {
let namespace = namespace_opt.ok_or(Error::NoEntry)?;
let schemes = scheme::schemes();
let (scheme_id, scheme_mutex) = schemes.get_name(namespace).ok_or(Error::NoEntry)?;
let file_id = scheme_mutex.lock().open(reference_opt.unwrap_or(b""), flags)?;
let (scheme_id, scheme) = {
let schemes = scheme::schemes();
let (scheme_id, scheme) = schemes.get_name(namespace).ok_or(Error::NoEntry)?;
(scheme_id, scheme.clone())
};
let file_id = scheme.open(reference_opt.unwrap_or(b""), flags)?;
(scheme_id, file_id)
};
@ -99,9 +72,12 @@ pub fn close(fd: usize) -> Result<usize> {
file
};
let schemes = scheme::schemes();
let scheme_mutex = schemes.get(file.scheme).ok_or(Error::BadFile)?;
let result = scheme_mutex.lock().close(file.number).and(Ok(0));
let scheme = {
let schemes = scheme::schemes();
let scheme = schemes.get(file.scheme).ok_or(Error::BadFile)?;
scheme.clone()
};
let result = scheme.close(file.number).and(Ok(0));
result
}
@ -115,12 +91,16 @@ pub fn dup(fd: usize) -> Result<usize> {
file
};
let schemes = scheme::schemes();
let scheme_mutex = schemes.get(file.scheme).ok_or(Error::BadFile)?;
let result = scheme_mutex.lock().dup(file.number);
let scheme = {
let schemes = scheme::schemes();
let scheme = schemes.get(file.scheme).ok_or(Error::BadFile)?;
scheme.clone()
};
let result = scheme.dup(file.number);
result
}
/// Sync the file descriptor
pub fn fsync(fd: usize) -> Result<usize> {
let file = {
let contexts = context::contexts();
@ -130,8 +110,49 @@ pub fn fsync(fd: usize) -> Result<usize> {
file
};
let schemes = scheme::schemes();
let scheme_mutex = schemes.get(file.scheme).ok_or(Error::BadFile)?;
let result = scheme_mutex.lock().fsync(file.number).and(Ok(0));
let scheme = {
let schemes = scheme::schemes();
let scheme = schemes.get(file.scheme).ok_or(Error::BadFile)?;
scheme.clone()
};
let result = scheme.fsync(file.number).and(Ok(0));
result
}
/// Read syscall
pub fn read(fd: usize, buf: &mut [u8]) -> Result<usize> {
let file = {
let contexts = context::contexts();
let context_lock = contexts.current().ok_or(Error::NoProcess)?;
let context = context_lock.read();
let file = context.get_file(fd).ok_or(Error::BadFile)?;
file
};
let scheme = {
let schemes = scheme::schemes();
let scheme = schemes.get(file.scheme).ok_or(Error::BadFile)?;
scheme.clone()
};
let result = scheme.read(file.number, buf);
result
}
/// Write syscall
pub fn write(fd: usize, buf: &[u8]) -> Result<usize> {
let file = {
let contexts = context::contexts();
let context_lock = contexts.current().ok_or(Error::NoProcess)?;
let context = context_lock.read();
let file = context.get_file(fd).ok_or(Error::BadFile)?;
file
};
let scheme = {
let schemes = scheme::schemes();
let scheme = schemes.get(file.scheme).ok_or(Error::BadFile)?;
scheme.clone()
};
let result = scheme.write(file.number, buf);
result
}