Expose device id via rdev in metadata

rcore-fs-sefs/src/lib.rs

@@ -195,6 +195,7 @@ impl vfs::INode for INodeImpl {
             uid: disk_inode.uid as usize,
             gid: disk_inode.gid as usize,
             blk_size: 0x1000,
+            rdev: 0,
         })
     }
     fn set_metadata(&self, metadata: &vfs::Metadata) -> vfs::Result<()> {

rcore-fs-sfs/src/lib.rs

@@ -470,6 +470,7 @@ impl vfs::INode for INodeImpl {
             uid: 0,
             gid: 0,
             blk_size: BLKSIZE,
+            rdev: self.device_inode_id,
         })
     }
     fn set_metadata(&self, _metadata: &vfs::Metadata) -> vfs::Result<()> {

rcore-fs-sfs/src/tests.rs

@@ -57,6 +57,7 @@ fn create_file() -> Result<()> {
             gid: 0,
             blk_size: 4096,
             dev: 0,
+            rdev: 100, // dummo why 100 here, maybe legacy data?
         }
     );
 

rcore-fs/src/vfs.rs

@@ -160,7 +160,7 @@ pub struct PollStatus {
 #[derive(Debug, Eq, PartialEq)]
 pub struct Metadata {
     /// Device ID
-    pub dev: usize,
+    pub dev: usize, // (major << 8) | minor
     /// Inode number
     pub inode: usize,
     /// Size in bytes
@@ -192,6 +192,9 @@ pub struct Metadata {
     pub uid: usize,
     /// Group ID
     pub gid: usize,
+    /// Raw device id
+    /// e.g. /dev/null: makedev(0x1, 0x3)
+    pub rdev: usize, // (major << 8) | minor
 }
 
 #[derive(Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Debug, Hash)]