new: 将sys_rmdir更改为sys_unlink,.且完成删除文件操作的vfs部分 (#69)

kernel/common/fcntl.h

@@ -10,22 +10,46 @@
  */
 #pragma once
 
-#define O_RDONLY 00000000 // Open Read-only
-#define O_WRONLY 00000001 // Open Write-only
-#define O_RDWR 00000002   // Open read/write
+#define O_RDONLY 00000000  // Open Read-only
+#define O_WRONLY 00000001  // Open Write-only
+#define O_RDWR 00000002    // Open read/write
 #define O_ACCMODE 00000003 // Mask for file access modes
 
-#define O_CREAT 00000100 // Create file if it does not exist
-#define O_EXCL 00000200 // Fail if file already exists
+#define O_CREAT 00000100  // Create file if it does not exist
+#define O_EXCL 00000200   // Fail if file already exists
 #define O_NOCTTY 00000400 // Do not assign controlling terminal
 
 #define O_TRUNC 00001000 // 文件存在且是普通文件，并以O_RDWR或O_WRONLY打开，则它会被清空
 
-#define O_APPEND 00002000   // 文件指针会被移动到文件末尾
+#define O_APPEND 00002000 // 文件指针会被移动到文件末尾
 
 #define O_NONBLOCK 00004000 // 非阻塞式IO模式
 
-#define O_EXEC 00010000 // 以仅执行的方式打开（非目录文件）
-#define O_SEARCH 00020000   // Open the directory for search only
+#define O_EXEC 00010000      // 以仅执行的方式打开（非目录文件）
+#define O_SEARCH 00020000    // Open the directory for search only
 #define O_DIRECTORY 00040000 // 打开的必须是一个目录
-#define O_NOFOLLOW 00100000 // Do not follow symbolic links
+#define O_NOFOLLOW 00100000  // Do not follow symbolic links
+
+/*
+ * The constants AT_REMOVEDIR and AT_EACCESS have the same value.  AT_EACCESS is
+ * meaningful only to faccessat, while AT_REMOVEDIR is meaningful only to
+ * unlinkat.  The two functions do completely different things and therefore,
+ * the flags can be allowed to overlap.  For example, passing AT_REMOVEDIR to
+ * faccessat would be undefined behavior and thus treating it equivalent to
+ * AT_EACCESS is valid undefined behavior.
+ */
+// 作为当前工作目录的文件描述符（用于指代cwd）
+#define AT_FDCWD -100
+#define AT_SYMLINK_NOFOLLOW 0x100 /* Do not follow symbolic links.  */
+#define AT_EACCESS 0x200          /* Test access permitted for effective IDs, not real IDs.  */
+#define AT_REMOVEDIR 0x200        /* Remove directory instead of unlinking file.  */
+#define AT_SYMLINK_FOLLOW 0x400   /* Follow symbolic links.  */
+#define AT_NO_AUTOMOUNT 0x800     /* Suppress terminal automount traversal */
+#define AT_EMPTY_PATH 0x1000      /* Allow empty relative pathname */
+
+#define AT_STATX_SYNC_TYPE 0x6000    /* Type of synchronisation required from statx() */
+#define AT_STATX_SYNC_AS_STAT 0x0000 /* - Do whatever stat() does */
+#define AT_STATX_FORCE_SYNC 0x2000   /* - Force the attributes to be sync'd with the server */
+#define AT_STATX_DONT_SYNC 0x4000    /* - Don't sync attributes with the server */
+
+#define AT_RECURSIVE 0x8000 /* Apply to the entire subtree */

kernel/common/user_namespace.h

@@ -0,0 +1,7 @@
+#pragma once
+
+// todo: 引入用户命名空间
+struct user_namespace
+{
+
+};