refactor: update filesystem

Ubiquitous/XiZi_AIoT/services/tools/mkfs/mkfs.c

@@ -38,7 +38,7 @@ Author: AIIT XUOS Lab
 Modification:
 1. Increse the number of blocks and inodes
 2. support more than one indirect blocks
-3. remove unused stat
+3. remove unused stat and nlink property of inode struct
 *************************************************/
 
 #include <assert.h>
@@ -136,7 +136,7 @@ int main(int argc, char* argv[])
     wsect(1, buf);
 
     // build root
-    rootino = ialloc(T_DIR);
+    rootino = ialloc(FS_DIRECTORY);
     assert(rootino == ROOT_INUM);
 
     bzero(&de, sizeof(de));
@@ -165,7 +165,7 @@ int main(int argc, char* argv[])
         if (argv[i][0] == '_')
             ++argv[i];
 
-        inum = ialloc(T_FILE);
+        inum = ialloc(FS_FILE);
 
         bzero(&de, sizeof(de));
         de.inum = xshort(inum);
@@ -251,7 +251,6 @@ uint ialloc(ushort type)
 
     bzero(&din, sizeof(din));
     din.type = xshort(type);
-    din.nlink = xshort(1);
     din.size = xint(0);
     din.inum = inum;
     winode(inum, &din);

Ubiquitous/XiZi_AIoT/services/tools/mkfs/mkfs.h

@@ -37,14 +37,14 @@ History:
 Author: AIIT XUOS Lab
 Modification:
 1. Increse the number of indirect blocks
-2. Rename some variables' name for readability
+2. Remove unused nlink of inode struct
 *************************************************/
 
 #pragma once
 
-#define T_DIR 1 // Directory
-#define T_FILE 2 // File
-#define T_DEV 3 // Device
+#define FS_DIRECTORY 1 // Directory
+#define FS_FILE 2 // File
+#define FS_DEVICE 3 // Device
 
 #define ROOT_INUM 1 // root inode number
 #define BLOCK_SIZE 512 // block size
@@ -74,8 +74,7 @@ struct SuperBlock {
 // Inode structure
 struct Inode {
     uint inum; // inode number
-    short type; // File type
-    short nlink; // Number of links to inode in file system
+    uint type; // File type
     uint size; // Size of file (bytes)
     uint addrs[NR_DIRECT_BLOCKS + NR_INDIRECT_BLOCKS]; // Data block addresses
 };