andrey/osblog
1
0
Fork 0
mirror of https://github.com/sgmarz/osblog.git synced 2024-11-23 18:06:20 +04:00
Code Issues Projects Releases Wiki Activity

Use global cache. fs::init will now check to see if the global cache is good or not. If it is already good, do nothing, otherwise cache the inodes.

Browse Source
This commit is contained in:
Stephen Marz 2020-05-15 12:29:59 -04:00
parent 8e414c62be
commit 3dd49c615e
2 changed files with 32 additions and 16 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

44
risc_v/src/fs.rs
View File

@ -68,9 +68,17 @@ pub struct DirEntry {
}
/// The MinixFileSystem implements the FileSystem trait for the VFS.
pub struct MinixFileSystem {
inode_cache: BTreeMap<String, Inode>
}
pub struct MinixFileSystem;
static mut MFS_INODE_CACHE: [Option<BTreeMap<String, Inode>>; 8] = [
None,
None,
None,
None,
None,
None,
None,
None
];
impl MinixFileSystem {
/// Inodes are the meta-data of a file, including the mode (permissions and type) and
@ -165,24 +173,32 @@ impl MinixFileSystem {
}
}
// Run this ONLY in a process!
pub fn init(bdev: usize) -> Self {
let mut btm = BTreeMap::new();
let cwd = String::from("/");
pub fn init(bdev: usize) {
if unsafe {MFS_INODE_CACHE[bdev-1].is_none() } {
let mut btm = BTreeMap::new();
let cwd = String::from("/");
// Let's look at the root (inode #1)
Self::cache_at(&mut btm, &cwd, 1, bdev);
Self {
inode_cache: btm
// Let's look at the root (inode #1)
Self::cache_at(&mut btm, &cwd, 1, bdev);
unsafe {
MFS_INODE_CACHE[bdev-1] = Some(btm);
}
}
}
/// The goal of open is to traverse the path given by path. If we cache the inodes
/// in RAM, it might make this much quicker. For now, this doesn't do anything since
/// we're just testing read based on if we know the Inode we're looking for.
pub fn open(&self, path: &String) -> Result<Inode, FsError> {
if let Some(inode) = self.inode_cache.get(path) {
Ok(*inode)
pub fn open(bdev: usize, path: &String) -> Result<Inode, FsError> {
if let Some(cache) = unsafe { MFS_INODE_CACHE[bdev-1].take() } {
let ret;
if let Some(inode) = cache.get(path) {
ret = Ok(*inode);
}
else {
ret = Err(FsError::FileNotFound);
}
ret
}
else {
Err(FsError::FileNotFound)

4
risc_v/src/test.rs
View File

@ -12,9 +12,9 @@ use alloc::string::String;
pub fn test_elf() {
// This won't be necessary after we connect this to the VFS, but for now, we need it.
const BDEV: usize = 8;
let mfs = MinixFileSystem::init(BDEV);
MinixFileSystem::init(BDEV);
let file_to_read = String::from("/helloworld.elf");
let desc = mfs.open(&file_to_read).ok();
let desc = MinixFileSystem::open(BDEV, &file_to_read).ok();
if desc.is_none() {
println!("Error reading {}", file_to_read);
return;