add ext4

api/axfeat/Cargo.toml

@@ -49,6 +49,7 @@ fs = ["alloc", "paging", "axdriver/virtio-blk", "dep:axfs", "axruntime/fs"] # TO
 fatfs = ["axfs/fatfs"]
 ext4fs = ["axfs/ext4fs"]
 myfs = ["axfs?/myfs"]
+ext4_rs = ["axfs/ext4_rs"]
 
 # Networking
 net = ["alloc", "paging", "axdriver/virtio-net", "dep:axnet", "axruntime/net"]

modules/axfs/Cargo.toml

@@ -18,6 +18,7 @@ myfs = ["dep:crate_interface"]
 use-ramdisk = []
 monolithic = []
 fatfs = ["dep:fatfs"]
+ext4_rs = ["dep:ext4_rs", "devfs", "ramfs", "procfs", "sysfs"]
 ext4fs = ["dep:lwext4_rust", "devfs", "ramfs", "procfs", "sysfs",]
 default = ["devfs", "ramfs", "fatfs", "procfs", "sysfs"]
 
@@ -33,6 +34,7 @@ axconfig = { path = "../axconfig", optional = true }
 axfs_vfs = { path = "../../crates/axfs_vfs" }
 axfs_devfs = { path = "../../crates/axfs_devfs", optional = true }
 axfs_ramfs = { path = "../../crates/axfs_ramfs", optional = true }
+ext4_rs = { path = "https://github.com/yuoo655/ext4_rs.git", optional = true }
 lwext4_rust = { git = "https://github.com/elliott10/lwext4_rust.git", rev = "f3048f87", optional = true }
 axdriver = { path = "../axdriver", features = ["block"] }
 axsync = { path = "../axsync" }

modules/axfs/src/dev.rs

@@ -93,4 +93,21 @@ impl Disk {
         };
         Ok(write_size)
     }
+
+    /// Read a single block starting from the specified offset.
+    pub fn read_offset(&mut self, offset: usize) -> [u8; BLOCK_SIZE] {
+        let block_id = offset / BLOCK_SIZE;
+        let mut block_data = [0u8; BLOCK_SIZE];
+        self.dev.read_block(block_id as u64, &mut block_data).unwrap();
+        block_data
+    }
+
+    /// Write single block starting from the specified offset. 
+    pub fn write_offset(&mut self, offset: usize, buf: &[u8]) -> DevResult<usize> {
+        assert!(buf.len() == BLOCK_SIZE, "Buffer length must be equal to BLOCK_SIZE");
+        assert!(offset % BLOCK_SIZE  ==  0);
+        let block_id = offset / BLOCK_SIZE;
+        self.dev.write_block(block_id as u64, buf).unwrap();
+        Ok(buf.len())
+    }
 }