add Ext2Fs::write_block

Author: tsatke

ext2/src/error.rs

@@ -8,6 +8,7 @@ pub enum Error {
     NotDirectory,
     NotRegularFile,
     DeviceRead,
+    DeviceWrite,
     InvalidInodeAddress(u32),
 }
 

ext2/src/lib.rs

@@ -5,6 +5,14 @@ extern crate alloc;
 
 use alloc::vec;
 
+pub use address::*;
+pub use dir::*;
+pub use error::*;
+pub use file::*;
+use filesystem::BlockDevice;
+pub use inode::*;
+pub use superblock::*;
+
 use crate::block_group::{BlockGroupDescriptor, BlockGroupDescriptorTable};
 
 mod address;
@@ -16,15 +24,6 @@ mod file;
 mod inode;
 mod superblock;
 
-use filesystem::BlockDevice;
-
-pub use address::*;
-pub use dir::*;
-pub use error::*;
-pub use file::*;
-pub use inode::*;
-pub use superblock::*;
-
 const ROOT_DIR_INODE_ADDRESS: InodeAddress = InodeAddress::new(2).unwrap();
 
 pub struct Ext2Fs<T> {
@@ -104,6 +103,13 @@ where
             .map_err(|_| Error::DeviceRead)
     }
 
+    pub fn write_block(&mut self, addr: BlockAddress, buf: &[u8]) -> Result<usize, Error> {
+        let offset = self.resolve_block_offset(addr);
+        self.block_device
+            .write_at(offset, buf)
+            .map_err(|_| Error::DeviceWrite)
+    }
+
     fn resolve_block_offset(&self, addr: BlockAddress) -> usize {
         (1024 + (addr.get() - 1) * self.superblock.block_size()) as usize
     }