forked from M-Labs/rust-fatfs
Ignore free_cluster_count in FSInfo sector if volume has dirty flag
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parent
1656540eac
commit
ccb205c906
13
src/fs.rs
13
src/fs.rs
@ -366,10 +366,10 @@ impl <'a> FileSystem<'a> {
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/// Note: creating multiple filesystem objects with one underlying device/disk image can
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/// cause filesystem corruption.
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pub fn new<T: ReadWriteSeek>(disk: &'a mut T, options: FsOptions) -> io::Result<Self> {
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// Make sure given image is not seeked
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// make sure given image is not seeked
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debug_assert!(disk.seek(SeekFrom::Current(0))? == 0);
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// Read boot sector
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// read boot sector
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let bpb = {
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let boot = BootRecord::deserialize(disk)?;
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if boot.boot_sig != [0x55, 0xAA] {
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@ -392,13 +392,20 @@ impl <'a> FileSystem<'a> {
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let total_clusters = data_sectors / bpb.sectors_per_cluster as u32;
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let fat_type = FatType::from_clusters(total_clusters);
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let fs_info = if fat_type == FatType::Fat32 {
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// read FSInfo sector if this is FAT32
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let mut fs_info = if fat_type == FatType::Fat32 {
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disk.seek(SeekFrom::Start(bpb.fs_info_sector as u64 * 512))?;
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FsInfoSector::deserialize(disk)?
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} else {
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FsInfoSector::default()
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};
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// if dirty flag is set completly ignore free_cluster_count in FSInfo
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if bpb.status_flags().dirty {
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fs_info.free_cluster_count = None;
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}
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// return FileSystem struct
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Ok(FileSystem {
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disk: RefCell::new(disk),
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options,
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