Bump littlefs2 to 0.4.0

CHANGELOG.md

@@ -19,6 +19,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Added support for custom backends in `backend` module.
 - Added optional support for API extensions in `serde_extensions` module
   behind the `serde-extensions` feature.
+- Added `types::Path` re-export of `littlefs2::path::Path`.
 
 ### Changed
 
@@ -30,6 +31,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   `PollClient::syscall`.
 - Upgrade the `interchange` dependency to version 0.3.0 ([#99][])
   - As a consequence the type `pipe::TrussedInterchange` becomes a const`pipe::TRUSSED_INTERCHANGE`
+- Updated `littlefs2` to 0.4.0.
 
 ### Fixed
 

Cargo.toml

@@ -42,7 +42,7 @@ delog = "0.1.0"
 cbor-smol = "0.4"
 heapless-bytes = { version = "0.3.0", features = ["cbor"] }
 interchange = "0.3.0"
-littlefs2 = "0.3.1"
+littlefs2 = "0.4.0"
 p256-cortex-m4 = { version = "0.1.0-alpha.5", features = ["prehash", "sec1-signatures"] }
 salty = { version = "0.2.0", features = ["cose"] }
 serde-indexed = "0.1.0"

src/types.rs

@@ -11,7 +11,7 @@ pub use littlefs2::{
     driver::Storage as LfsStorage,
     fs::{DirEntry, Filesystem, Metadata},
     io::Result as LfsResult,
-    path::PathBuf,
+    path::{Path, PathBuf},
 };
 
 use rand_core::{CryptoRng, RngCore};

src/virt/store.rs

@@ -5,7 +5,7 @@ use std::{
     path::PathBuf,
 };
 
-use generic_array::typenum::{U16, U512};
+use generic_array::typenum::{U512, U8};
 use littlefs2::{const_ram_storage, driver::Storage, fs::Allocation};
 
 use crate::{
@@ -53,15 +53,9 @@ impl Storage for FilesystemStorage {
     const BLOCK_CYCLES: isize = -1;
 
     type CACHE_SIZE = U512;
-    type LOOKAHEADWORDS_SIZE = U16;
-    // TODO: This can't actually be changed currently
-    // type FILENAME_MAX_PLUS_ONE = U256;
-    // type PATH_MAX_PLUS_ONE = U256;
-    // const FILEBYTES_MAX: usize = littlefs2::ll::LFS_FILE_MAX as _;
-    // TODO: This can't actually be changed currently
-    // type ATTRBYTES_MAX = U1022;
-
-    fn read(&self, offset: usize, buffer: &mut [u8]) -> LfsResult<usize> {
+    type LOOKAHEAD_SIZE = U8;
+
+    fn read(&mut self, offset: usize, buffer: &mut [u8]) -> LfsResult<usize> {
         debug!("read: offset: {}, len: {}", offset, buffer.len());
         let mut file = File::open(&self.0).unwrap();
         file.seek(SeekFrom::Start(offset as _)).unwrap();