Use references instead of Rc for shared state.

examples/cat.rs

@@ -10,8 +10,8 @@ use rfat::FatFileSystem;
 
 fn main() {
     let file = File::open("resources/fat32.img").unwrap();
-    let buf_rdr = BufReader::new(file);
+    let mut buf_rdr = BufReader::new(file);
-    let mut fs = FatFileSystem::new(Box::new(buf_rdr)).unwrap();
+    let fs = FatFileSystem::new(&mut buf_rdr).unwrap();
     let mut root_dir = fs.root_dir();
     let mut file = root_dir.open_file(&env::args().nth(1).unwrap()).unwrap();
     let mut buf = vec![];

examples/ls.rs

@@ -24,8 +24,8 @@ fn format_file_size(size: u64) -> String {
 
 fn main() {
     let file = File::open("resources/fat32.img").unwrap();
-    let buf_rdr = BufReader::new(file);
+    let mut buf_rdr = BufReader::new(file);
-    let mut fs = FatFileSystem::new(Box::new(buf_rdr)).unwrap();
+    let fs = FatFileSystem::new(&mut buf_rdr).unwrap();
     let mut root_dir = fs.root_dir();
     let mut dir = match env::args().nth(1) {
         None => root_dir,

src/dir.rs

@@ -7,9 +7,34 @@ use std::str;
 use byteorder::{LittleEndian, ReadBytesExt};
 use chrono::{DateTime, Date, TimeZone, Local};
 
-use fs::{FatSharedStateRef, ReadSeek};
+use fs::{FatSharedStateRef, FatSlice};
 use file::FatFile;
 
+pub(crate) enum FatDirReader<'a, 'b: 'a> {
+    File(FatFile<'a, 'b>),
+    Root(FatSlice<'a, 'b>),
+}
+
+impl <'a, 'b> Read for FatDirReader<'a, 'b> {
+    fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
+        match self {
+            &mut FatDirReader::File(ref mut file) => file.read(buf),
+            &mut FatDirReader::Root(ref mut raw) => raw.read(buf),
+        }
+    }
+}
+
+impl <'a, 'b> Seek for FatDirReader<'a, 'b> {
+    fn seek(&mut self, pos: SeekFrom) -> io::Result<u64> {
+        match self {
+            &mut FatDirReader::File(ref mut file) => file.seek(pos),
+            &mut FatDirReader::Root(ref mut raw) => raw.seek(pos),
+        }
+    }
+}
+
+
+
 bitflags! {
     #[derive(Default)]
     pub struct FatFileAttributes: u8 {
@@ -61,13 +86,13 @@ enum FatDirEntryData {
 }
 
 #[derive(Clone)]
-pub struct FatDirEntry {
+pub struct FatDirEntry<'a, 'b: 'a> {
     data: FatDirFileEntryData,
     lfn: Vec<u16>,
-    state: FatSharedStateRef,
+    state: FatSharedStateRef<'a, 'b>,
 }
 
-impl FatDirEntry {
+impl <'a, 'b> FatDirEntry<'a, 'b> {
     pub fn short_file_name(&self) -> String {
         let name = str::from_utf8(&self.data.name[0..8]).unwrap().trim_right();
         let ext = str::from_utf8(&self.data.name[8..11]).unwrap().trim_right();
@@ -98,19 +123,19 @@ impl FatDirEntry {
         ((self.data.first_cluster_hi as u32) << 16) | self.data.first_cluster_lo as u32
     }
     
-    pub fn to_file(&self) -> FatFile {
+    pub fn to_file(&self) -> FatFile<'a, 'b> {
         if self.is_dir() {
             panic!("This is a directory");
         }
-        FatFile::new(self.first_cluster(), Some(self.data.size), self.state.clone())
+        FatFile::new(self.first_cluster(), Some(self.data.size), self.state)
     }
     
-    pub fn to_dir(&self) -> FatDir {
+    pub fn to_dir(&self) -> FatDir<'a, 'b> {
         if !self.is_dir() {
             panic!("This is a file");
         }
-        let file = FatFile::new(self.first_cluster(), None, self.state.clone());
+        let file = FatFile::new(self.first_cluster(), None, self.state);
-        FatDir::new(Box::new(file), self.state.clone())
+        FatDir::new(FatDirReader::File(file), self.state)
     }
     
     pub fn len(&self) -> u64 {
@@ -136,28 +161,28 @@ impl FatDirEntry {
     
     fn convert_date_time(dos_date: u16, dos_time: u16) -> DateTime<Local> {
         let (hour, min, sec) = (dos_time >> 11, (dos_time >> 5) & 0x3F, (dos_time & 0x1F) * 2);
-        Self::convert_date(dos_date).and_hms(hour as u32, min as u32, sec as u32)
+        FatDirEntry::convert_date(dos_date).and_hms(hour as u32, min as u32, sec as u32)
     }
 }
 
-impl fmt::Debug for FatDirEntry {
+impl <'a, 'b> fmt::Debug for FatDirEntry<'a, 'b> {
     fn fmt(&self, f: &mut fmt::Formatter) -> Result<(), fmt::Error> {
         self.data.fmt(f)
     }
 }
 
-pub struct FatDir {
+pub struct FatDir<'a, 'b: 'a> {
-    rdr: Box<ReadSeek>,
+    rdr: FatDirReader<'a, 'b>,
-    state: FatSharedStateRef,
+    state: FatSharedStateRef<'a, 'b>,
 }
 
-impl FatDir {
+impl <'a, 'b> FatDir<'a, 'b> {
     
-    pub(crate) fn new(rdr: Box<ReadSeek>, state: FatSharedStateRef) -> FatDir {
+    pub(crate) fn new(rdr: FatDirReader<'a, 'b>, state: FatSharedStateRef<'a, 'b>) -> FatDir<'a, 'b> {
         FatDir { rdr, state }
     }
     
-    pub fn list(&mut self) -> io::Result<Vec<FatDirEntry>> {
+    pub fn list(&mut self) -> io::Result<Vec<FatDirEntry<'a, 'b>>> {
         self.rewind();
         Ok(self.map(|x| x.unwrap()).collect())
     }
@@ -202,15 +227,15 @@ impl FatDir {
         }
     }
     
-    fn split_path<'a>(path: &'a str) -> (&'a str, Option<&'a str>) {
+    fn split_path<'c>(path: &'c str) -> (&'c str, Option<&'c str>) {
         let mut path_split = path.trim_matches('/').splitn(2, "/");
         let comp = path_split.next().unwrap();
         let rest_opt = path_split.next();
         (comp, rest_opt)
     }
     
-    fn find_entry(&mut self, name: &str) -> io::Result<FatDirEntry> {
+    fn find_entry(&mut self, name: &str) -> io::Result<FatDirEntry<'a, 'b>> {
-        let entries: Vec<FatDirEntry> = self.list()?;
+        let entries: Vec<FatDirEntry<'a, 'b>> = self.list()?;
         for e in entries {
             if e.file_name().eq_ignore_ascii_case(name) {
                 return Ok(e);
@@ -219,7 +244,7 @@ impl FatDir {
         Err(io::Error::new(ErrorKind::NotFound, "file not found"))
     }
     
-    pub fn open_dir(&mut self, path: &str) -> io::Result<FatDir> {
+    pub fn open_dir(&mut self, path: &str) -> io::Result<FatDir<'a, 'b>> {
         let (name, rest_opt) = Self::split_path(path);
         let e = self.find_entry(name)?;
         match rest_opt {
@@ -228,7 +253,7 @@ impl FatDir {
         }
     }
     
-    pub fn open_file(&mut self, path: &str) -> io::Result<FatFile> {
+    pub fn open_file(&mut self, path: &str) -> io::Result<FatFile<'a, 'b>> {
         let (name, rest_opt) = Self::split_path(path);
         let e = self.find_entry(name)?;
         match rest_opt {
@@ -238,10 +263,10 @@ impl FatDir {
     }
 }
 
-impl Iterator for FatDir {
+impl <'a, 'b> Iterator for FatDir<'a, 'b> {
-    type Item = io::Result<FatDirEntry>;
+    type Item = io::Result<FatDirEntry<'a, 'b>>;
 
-    fn next(&mut self) -> Option<io::Result<FatDirEntry>> {
+    fn next(&mut self) -> Option<io::Result<FatDirEntry<'a, 'b>>> {
         let mut lfn_buf = Vec::<u16>::new();
         loop {
             let res = self.read_dir_entry_data();

src/file.rs

@@ -6,16 +6,16 @@ use std::io;
 use fs::FatSharedStateRef;
 
 
-pub struct FatFile {
+pub struct FatFile<'a, 'b: 'a> {
     first_cluster: u32,
     size: Option<u32>,
     offset: u32,
     current_cluster: Option<u32>,
-    state: FatSharedStateRef,
+    state: FatSharedStateRef<'a, 'b>,
 }
 
-impl FatFile {
+impl <'a, 'b> FatFile<'a, 'b> {
-    pub(crate) fn new(first_cluster: u32, size: Option<u32>, state: FatSharedStateRef) -> FatFile {
+    pub(crate) fn new(first_cluster: u32, size: Option<u32>, state: FatSharedStateRef<'a, 'b>) -> Self {
         FatFile {
             first_cluster, size, state,
             current_cluster: Some(first_cluster),
@@ -24,7 +24,7 @@ impl FatFile {
     }
 }
 
-impl Read for FatFile {
+impl <'a, 'b> Read for FatFile<'a, 'b> {
     fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
         let mut buf_offset: usize = 0;
         let cluster_size = self.state.borrow().get_cluster_size();
@@ -55,7 +55,7 @@ impl Read for FatFile {
     }
 }
 
-impl Seek for FatFile {
+impl <'a, 'b> Seek for FatFile<'a, 'b> {
     fn seek(&mut self, pos: SeekFrom) -> io::Result<u64> {
         let new_offset = match pos {
             SeekFrom::Current(x) => self.offset as i64 + x,

src/fs.rs

@@ -1,15 +1,13 @@
-use std::cell::RefCell;
+use core::cell::RefCell;
 use std::cmp;
 use std::io::prelude::*;
-use std::io::{Error, ErrorKind};
+use std::io::{Error, ErrorKind, SeekFrom};
-use std::io::SeekFrom;
 use std::io;
 use std::str;
-use std::rc::Rc;
 use byteorder::{LittleEndian, ReadBytesExt};
 
 use file::FatFile;
-use dir::FatDir;
+use dir::{FatDirReader, FatDir};
 use table::{FatTable, FatTable12, FatTable16, FatTable32};
 
 // FAT implementation based on:
@@ -24,17 +22,17 @@ pub enum FatType {
 pub trait ReadSeek: Read + Seek {}
 impl<T> ReadSeek for T where T: Read + Seek {}
 
-pub(crate) struct FatSharedState {
+pub(crate) struct FatSharedState<'a> {
-    pub rdr: Box<ReadSeek>,
+    pub(crate) rdr: &'a mut ReadSeek,
-    pub fat_type: FatType,
+    pub(crate) fat_type: FatType,
-    pub boot: FatBootRecord,
+    pub(crate) boot: FatBootRecord,
-    pub first_fat_sector: u32,
+    pub(crate) first_fat_sector: u32,
-    pub first_data_sector: u32,
+    pub(crate) first_data_sector: u32,
-    pub root_dir_sectors: u32,
+    pub(crate) root_dir_sectors: u32,
-    pub table: Box<FatTable>,
+    pub(crate) table: Box<FatTable>,
 }
 
-impl FatSharedState {
+impl <'a> FatSharedState<'a> {
     pub(crate) fn offset_from_sector(&self, sector: u32) -> u64 {
         (sector as u64) * self.boot.bpb.bytes_per_sector as u64
     }
@@ -52,12 +50,6 @@ impl FatSharedState {
     }
 }
 
-pub(crate) type FatSharedStateRef = Rc<RefCell<FatSharedState>>;
-
-pub struct FatFileSystem {
-    pub(crate) state: FatSharedStateRef,
-}
-
 #[allow(dead_code)]
 #[derive(Default, Debug, Clone)]
 pub(crate) struct FatBiosParameterBlock {
@@ -111,12 +103,19 @@ impl Default for FatBootRecord {
     }
 }
 
-impl FatFileSystem {
+pub(crate) type FatSharedStateCell<'a> = RefCell<FatSharedState<'a>>;
+pub(crate) type FatSharedStateRef<'a, 'b: 'a> = &'a RefCell<FatSharedState<'b>>;
 
-    pub fn new<T: ReadSeek + 'static>(mut rdr: Box<T>) -> io::Result<FatFileSystem> {
+pub struct FatFileSystem<'a> {
+    pub(crate) state: FatSharedStateCell<'a>,
+}
+
+impl <'a> FatFileSystem<'a> {
+    
+    pub fn new<T: ReadSeek>(mut rdr: &'a mut T) -> io::Result<FatFileSystem<'a>> {
         let boot = Self::read_boot_record(&mut *rdr)?;
         if boot.boot_sig != [0x55, 0xAA] {
-            return Err(Error::new(ErrorKind::Other, "invalid signature"));
+            return Err(Error::new(ErrorKind::Other, "invBox::newalid signature"));
         }
         
         let total_sectors = if boot.bpb.total_sectors_16 == 0 { boot.bpb.total_sectors_32 } else { boot.bpb.total_sectors_16 as u32 };
@@ -132,9 +131,9 @@ impl FatFileSystem {
         rdr.seek(SeekFrom::Start(fat_offset as u64))?;
         let table_size_bytes = table_size * boot.bpb.bytes_per_sector as u32;
         let table: Box<FatTable> = match fat_type {
-            FatType::Fat12 => Box::new(FatTable12::read(&mut rdr, table_size_bytes as usize)?),
+            FatType::Fat12 => Box::new(FatTable12::read(rdr, table_size_bytes as usize)?),
-            FatType::Fat16 => Box::new(FatTable16::read(&mut rdr, table_size_bytes as usize)?),
+            FatType::Fat16 => Box::new(FatTable16::read(rdr, table_size_bytes as usize)?),
-            FatType::Fat32 => Box::new(FatTable32::read(&mut rdr, table_size_bytes as usize)?),
+            FatType::Fat32 => Box::new(FatTable32::read(rdr, table_size_bytes as usize)?),
             _ => panic!("TODO: exfat")
         };
         
@@ -148,9 +147,8 @@ impl FatFileSystem {
             table,
         };
         
-        let state_rc = Rc::new(RefCell::new(state));
         Ok(FatFileSystem {
-            state: state_rc,
+            state: RefCell::new(state),
         })
     }
     
@@ -166,14 +164,16 @@ impl FatFileSystem {
         str::from_utf8(&self.state.borrow().boot.bpb.volume_label).unwrap().trim_right().to_string()
     }
     
-    pub fn root_dir(&mut self) -> FatDir {
+    pub fn root_dir<'b>(&'b self) -> FatDir<'b, 'a> {
+        let root_rdr = {
             let state = self.state.borrow();
-        let root_rdr: Box<ReadSeek> = match state.fat_type {
+            match state.fat_type {
-            FatType::Fat12 | FatType::Fat16 => Box::new(FatSlice::from_sectors(
+                FatType::Fat12 | FatType::Fat16 => FatDirReader::Root(FatSlice::from_sectors(
-                state.first_data_sector - state.root_dir_sectors, state.root_dir_sectors, self.state.clone())),
+                   state.first_data_sector - state.root_dir_sectors, state.root_dir_sectors, &self.state)),
-            _ => Box::new(FatFile::new(state.boot.bpb.root_cluster, None, self.state.clone())) // FIXME
+                _ => FatDirReader::File(FatFile::new(state.boot.bpb.root_cluster, None, &self.state)),
+            }
         };
-        FatDir::new(root_rdr, self.state.clone())
+        FatDir::new(root_rdr, &self.state)
     }
     
     fn read_bpb(rdr: &mut Read) -> io::Result<FatBiosParameterBlock> {
@@ -248,25 +248,25 @@ impl FatFileSystem {
     }
 }
 
-struct FatSlice {
+pub(crate) struct FatSlice<'a, 'b: 'a> {
     begin: u64,
     size: u64,
     offset: u64,
-    state: FatSharedStateRef,
+    state: FatSharedStateRef<'a, 'b>,
 }
 
-impl FatSlice {
+impl <'a, 'b> FatSlice<'a, 'b> {
-    pub(crate) fn new(begin: u64, size: u64, state: FatSharedStateRef) -> FatSlice {
+    pub(crate) fn new(begin: u64, size: u64, state: FatSharedStateRef<'a, 'b>) -> Self {
         FatSlice { begin, size, state, offset: 0 }
     }
     
-    pub(crate) fn from_sectors(first_sector: u32, sectors_count: u32, state: FatSharedStateRef) -> FatSlice {
+    pub(crate) fn from_sectors(first_sector: u32, sectors_count: u32, state: FatSharedStateRef<'a, 'b>) -> Self {
         let bytes_per_sector = state.borrow().boot.bpb.bytes_per_sector as u64;
         Self::new(first_sector as u64 * bytes_per_sector, sectors_count as u64 * bytes_per_sector, state)
     }
 }
 
-impl Read for FatSlice {
+impl <'a, 'b> Read for FatSlice<'a, 'b> {
     fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
         let offset = self.begin + self.offset;
         let read_size = cmp::min((self.size - self.offset) as usize, buf.len());
@@ -278,7 +278,7 @@ impl Read for FatSlice {
     }
 }
 
-impl Seek for FatSlice {
+impl <'a, 'b> Seek for FatSlice<'a, 'b> {
     fn seek(&mut self, pos: SeekFrom) -> io::Result<u64> {
         let new_offset = match pos {
             SeekFrom::Current(x) => self.offset as i64 + x,

src/lib.rs

@@ -3,6 +3,7 @@
 
 extern crate byteorder;
 extern crate chrono;
+extern crate core;
 
 #[macro_use]
 extern crate bitflags;

tests/integration-test.rs

@@ -7,18 +7,19 @@ use std::str;
 
 use rfat::{FatFileSystem, FatType};
 
-const TEST_TEXT: &'static str = "Rust is cool!\n";
+const TEST_TEXT: &str = "Rust is cool!\n";
-const FAT12_IMG: &'static str = "resources/fat12.img";
+const FAT12_IMG: &str = "resources/fat12.img";
-const FAT16_IMG: &'static str = "resources/fat16.img";
+const FAT16_IMG: &str = "resources/fat16.img";
-const FAT32_IMG: &'static str = "resources/fat32.img";
+const FAT32_IMG: &str = "resources/fat32.img";
 
-fn open_fs(filename: &str) -> FatFileSystem {
+fn call_with_fs(f: &Fn(FatFileSystem) -> (), filename: &str) {
     let file = File::open(filename).unwrap();
-    let buf_rdr = BufReader::new(file);
+    let mut buf_rdr = BufReader::new(file);
-    FatFileSystem::new(Box::new(buf_rdr)).unwrap()
+    let fs = FatFileSystem::new(&mut buf_rdr).unwrap();
+    f(fs);
 }
 
-fn test_root_dir(mut fs: FatFileSystem) {
+fn test_root_dir(fs: FatFileSystem) {
     let mut root_dir = fs.root_dir();
     let entries = root_dir.list().unwrap();
     let short_names = entries.iter().map(|e| e.short_file_name()).collect::<Vec<String>>();
@@ -33,20 +34,20 @@ fn test_root_dir(mut fs: FatFileSystem) {
 
 #[test]
 fn test_root_dir_fat12() {
-    test_root_dir(open_fs(FAT12_IMG));
+    call_with_fs(&test_root_dir, FAT12_IMG)
 }
 
 #[test]
 fn test_root_dir_fat16() {
-    test_root_dir(open_fs(FAT16_IMG));
+    call_with_fs(&test_root_dir, FAT16_IMG)
 }
 
 #[test]
 fn test_root_dir_fat32() {
-    test_root_dir(open_fs(FAT32_IMG));
+    call_with_fs(&test_root_dir, FAT32_IMG)
 }
 
-fn test_read_seek_short_file(mut fs: FatFileSystem) {
+fn test_read_seek_short_file(fs: FatFileSystem) {
     let mut root_dir = fs.root_dir();
     let mut short_file = root_dir.open_file("short.txt").unwrap();
     let mut buf = Vec::new();
@@ -61,20 +62,20 @@ fn test_read_seek_short_file(mut fs: FatFileSystem) {
 
 #[test]
 fn test_read_seek_short_file_fat12() {
-    test_read_seek_short_file(open_fs(FAT12_IMG))
+    call_with_fs(&test_read_seek_short_file, FAT12_IMG)
 }
 
 #[test]
 fn test_read_seek_short_file_fat16() {
-    test_read_seek_short_file(open_fs(FAT16_IMG))
+    call_with_fs(&test_read_seek_short_file, FAT16_IMG)
 }
 
 #[test]
 fn test_read_seek_short_file_fat32() {
-    test_read_seek_short_file(open_fs(FAT32_IMG))
+    call_with_fs(&test_read_seek_short_file, FAT32_IMG)
 }
 
-fn test_read_long_file(mut fs: FatFileSystem) {
+fn test_read_long_file(fs: FatFileSystem) {
     let mut root_dir = fs.root_dir();
     let mut long_file = root_dir.open_file("long.txt").unwrap();
     let mut buf = Vec::new();
@@ -90,20 +91,20 @@ fn test_read_long_file(mut fs: FatFileSystem) {
 
 #[test]
 fn test_read_long_file_fat12() {
-    test_read_long_file(open_fs(FAT12_IMG))
+    call_with_fs(&test_read_long_file, FAT12_IMG)
 }
 
 #[test]
 fn test_read_long_file_fat16() {
-    test_read_long_file(open_fs(FAT16_IMG))
+    call_with_fs(&test_read_long_file, FAT16_IMG)
 }
 
 #[test]
 fn test_read_long_file_fat32() {
-    test_read_long_file(open_fs(FAT32_IMG))
+    call_with_fs(&test_read_long_file, FAT32_IMG)
 }
 
-fn test_get_dir_by_path(mut fs: FatFileSystem) {
+fn test_get_dir_by_path(fs: FatFileSystem) {
     let mut root_dir = fs.root_dir();
     let mut dir = root_dir.open_dir("very/long/path/").unwrap();
     let entries = dir.list().unwrap();
@@ -113,20 +114,20 @@ fn test_get_dir_by_path(mut fs: FatFileSystem) {
 
 #[test]
 fn test_get_dir_by_path_fat12() {
-    test_get_dir_by_path(open_fs(FAT12_IMG))
+    call_with_fs(&test_get_dir_by_path, FAT12_IMG)
 }
 
 #[test]
 fn test_get_dir_by_path_fat16() {
-    test_get_dir_by_path(open_fs(FAT16_IMG))
+    call_with_fs(&test_get_dir_by_path, FAT16_IMG)
 }
 
 #[test]
 fn test_get_dir_by_path_fat32() {
-    test_get_dir_by_path(open_fs(FAT32_IMG))
+    call_with_fs(&test_get_dir_by_path, FAT32_IMG)
 }
 
-fn test_get_file_by_path(mut fs: FatFileSystem) {
+fn test_get_file_by_path(fs: FatFileSystem) {
     let mut root_dir = fs.root_dir();
     let mut file = root_dir.open_file("very/long/path/test.txt").unwrap();
     let mut buf = Vec::new();
@@ -141,17 +142,17 @@ fn test_get_file_by_path(mut fs: FatFileSystem) {
 
 #[test]
 fn test_get_file_by_path_fat12() {
-    test_get_file_by_path(open_fs(FAT12_IMG))
+    call_with_fs(&test_get_file_by_path, FAT12_IMG)
 }
 
 #[test]
 fn test_get_file_by_path_fat16() {
-    test_get_file_by_path(open_fs(FAT16_IMG))
+    call_with_fs(&test_get_file_by_path, FAT16_IMG)
 }
 
 #[test]
 fn test_get_file_by_path_fat32() {
-    test_get_file_by_path(open_fs(FAT32_IMG))
+    call_with_fs(&test_get_file_by_path, FAT32_IMG)
 }
 
 fn test_volume_metadata(fs: FatFileSystem, fat_type: FatType) {
@@ -162,15 +163,15 @@ fn test_volume_metadata(fs: FatFileSystem, fat_type: FatType) {
 
 #[test]
 fn test_volume_metadata_fat12() {
-    test_volume_metadata(open_fs(FAT12_IMG), FatType::Fat12)
+    call_with_fs(&|fs| test_volume_metadata(fs, FatType::Fat12), FAT12_IMG)
 }
 
 #[test]
 fn test_volume_metadata_fat16() {
-    test_volume_metadata(open_fs(FAT16_IMG), FatType::Fat16)
+    call_with_fs(&|fs| test_volume_metadata(fs, FatType::Fat16), FAT16_IMG)
 }
 
 #[test]
 fn test_volume_metadata_fat32() {
-    test_volume_metadata(open_fs(FAT32_IMG), FatType::Fat32)
+    call_with_fs(&|fs| test_volume_metadata(fs, FatType::Fat32), FAT32_IMG)
 }