update name of code to labcodes

labcodes/lab8/kern/fs/vfs/vfsfile.c

@@ -0,0 +1,110 @@
+#include <defs.h>
+#include <string.h>
+#include <vfs.h>
+#include <inode.h>
+#include <unistd.h>
+#include <error.h>
+#include <assert.h>
+
+
+// open file in vfs, get/create inode for file with filename path.
+int
+vfs_open(char *path, uint32_t open_flags, struct inode **node_store) {
+    bool can_write = 0;
+    switch (open_flags & O_ACCMODE) {
+    case O_RDONLY:
+        break;
+    case O_WRONLY:
+    case O_RDWR:
+        can_write = 1;
+        break;
+    default:
+        return -E_INVAL;
+    }
+
+    if (open_flags & O_TRUNC) {
+        if (!can_write) {
+            return -E_INVAL;
+        }
+    }
+
+    int ret; 
+    struct inode *node;
+    bool excl = (open_flags & O_EXCL) != 0;
+    bool create = (open_flags & O_CREAT) != 0;
+    ret = vfs_lookup(path, &node);
+
+    if (ret != 0) {
+        if (ret == -16 && (create)) {
+            char *name;
+            struct inode *dir;
+            if ((ret = vfs_lookup_parent(path, &dir, &name)) != 0) {
+                return ret;
+            }
+            ret = vop_create(dir, name, excl, &node);
+        } else return ret;
+    } else if (excl && create) {
+        return -E_EXISTS;
+    }
+    assert(node != NULL);
+    
+    if ((ret = vop_open(node, open_flags)) != 0) {
+        vop_ref_dec(node);
+        return ret;
+    }
+
+    vop_open_inc(node);
+    if (open_flags & O_TRUNC || create) {
+        if ((ret = vop_truncate(node, 0)) != 0) {
+            vop_open_dec(node);
+            vop_ref_dec(node);
+            return ret;
+        }
+    }
+    *node_store = node;
+    return 0;
+}
+
+// close file in vfs
+int
+vfs_close(struct inode *node) {
+    vop_open_dec(node);
+    vop_ref_dec(node);
+    return 0;
+}
+
+// unimplement
+int
+vfs_unlink(char *path) {
+    return -E_UNIMP;
+}
+
+// unimplement
+int
+vfs_rename(char *old_path, char *new_path) {
+    return -E_UNIMP;
+}
+
+// unimplement
+int
+vfs_link(char *old_path, char *new_path) {
+    return -E_UNIMP;
+}
+
+// unimplement
+int
+vfs_symlink(char *old_path, char *new_path) {
+    return -E_UNIMP;
+}
+
+// unimplement
+int
+vfs_readlink(char *path, struct iobuf *iob) {
+    return -E_UNIMP;
+}
+
+// unimplement
+int
+vfs_mkdir(char *path){
+    return -E_UNIMP;
+}