From 794f72d7219df40ff61f939059a39b03d0665ee7 Mon Sep 17 00:00:00 2001
From: nganhkhoa <mail.nganhkhoa@gmail.com>
Date: Tue, 29 Oct 2024 10:31:47 +0000
Subject: [PATCH] working list dir

---
 Makefile |  5 ++++-
 voidfs.c | 50 +++++++++++++++++++++++++++++++++-----------------
 2 files changed, 37 insertions(+), 18 deletions(-)

diff --git a/Makefile b/Makefile
index 9e71f15..99915c0 100644
--- a/Makefile
+++ b/Makefile
@@ -3,4 +3,7 @@ obj-m += voidfs.o
 all: voidfs
 
 voidfs:
-	make -C /lib/modules/$(shell uname -r)/build M=$(PWD) modules
+	make -C /lib/modules/$(shell uname -r)/build M=$(shell pwd) modules
+
+clean:
+	make -C /lib/modules/$(shell uname -r)/build M=$(shell pwd) clean
diff --git a/voidfs.c b/voidfs.c
index 05981d8..8dc5748 100644
--- a/voidfs.c
+++ b/voidfs.c
@@ -17,6 +17,10 @@ static int voidfs_fill_super(struct super_block *sb, void *data, int silent);
 void voidfs_kill_superblock(struct super_block *sb);
 
 
+struct dentry *voidfs_lookup(struct inode *dir, struct dentry *dentry, unsigned int);
+int voidfs_readdir(struct file *fp, struct dir_context *ctx);
+
+ssize_t voidfs_open(struct file *fp, char __user *buf, size_t len, loff_t *ppos);
 ssize_t voidfs_read(struct file *fp, char __user *buf, size_t len, loff_t *ppos);
 ssize_t voidfs_write(struct file *fp, const char __user *buf, size_t len, loff_t *ppos);
 
@@ -30,19 +34,29 @@ struct file_system_type voidfs_fs_type = {
 
 struct super_operations voidfs_super_ops = {
     // null for now
-}
+};
 
-struct super_operations voidfs_inode_ops = {
-    // null for now
-}
+struct inode_operations voidfs_inode_ops = {
+    .lookup = voidfs_lookup,
+};
 
 struct file_operations voidfs_dir_ops = {
     .iterate_shared = voidfs_readdir,
-}
+};
 
 struct file_operations voidfs_file_ops = {
+    .open = voidfs_open,
     .read = voidfs_read,
     .write = voidfs_write,
+};
+
+struct dentry *voidfs_lookup(struct inode *dir, struct dentry *dentry, unsigned int) {
+    struct inode* inode = NULL;
+
+    printk(KERN_INFO "listing directory uwu %s", dentry->d_name.name);
+
+    d_add(dentry, inode);
+    return NULL;
 }
 
 int voidfs_readdir(struct file *fp, struct dir_context *ctx) {
@@ -52,7 +66,7 @@ int voidfs_readdir(struct file *fp, struct dir_context *ctx) {
 
     printk(KERN_INFO "readdir");
 
-    inode = file_inode(file);
+    inode = file_inode(fp);
     sb = inode->i_sb;
 
     // if (inode &&
@@ -67,7 +81,7 @@ ssize_t voidfs_read(struct file *fp, char __user *buf, size_t len, loff_t *ppos)
     struct inode *inode;
     struct super_block *sb;
 
-    inode = file_inode(file);
+    inode = file_inode(fp);
     if (!inode) {
         return -EFAULT;
     }
@@ -83,14 +97,15 @@ ssize_t voidfs_read(struct file *fp, char __user *buf, size_t len, loff_t *ppos)
     // get as much as we can
 
     if (copy_to_user(buf, buffer, nbytes)) {
-        brelse(bh);
         printk(KERN_ERR
                "Error copying file content to userspace buffer\n");
         return -EFAULT;
     }
+    return 0;
 }
 
 ssize_t voidfs_write(struct file *fp, const char __user *buf, size_t len, loff_t *ppos) {
+    return 0;
 }
 
 struct dentry *voidfs_mount(struct file_system_type *fs_type, int flags, const char *dev_name, void *data) {
@@ -127,21 +142,22 @@ static int voidfs_fill_super(struct super_block *sb, void *data, int silent) {
     if (!root_inode) {
         return -ENOMEM;
     }
-    inode_init_owner(root_inode, NULL, root_inode->i_mode);
+    root_inode->i_mode = S_IFDIR | 0644;
+    inode_init_owner(&nop_mnt_idmap, root_inode, NULL, root_inode->i_mode);
 
     root_inode->i_sb = sb;
     root_inode->i_op = &voidfs_inode_ops;
-    root_inode->i_atime = root_inode->i_mtime
-                   = root_inode->i_ctime
-                   = CURRENT_TIME;
-
     root_inode->i_fop = &voidfs_dir_ops;
 
-    // create a dummy file entry point
-    root_inode->i_fop = &voidfs_file_ops;
-
     sb->s_root = d_make_root(root_inode);
 
+    // create a dummy file entry point
+    // root_inode->i_fop = &voidfs_file_ops;
+
+
+    // create a child file
+
+
     return 0;
 }
 
@@ -190,5 +206,5 @@ static void __exit voidfs_exit(void)
 module_init(voidfs_init);
 module_exit(voidfs_exit);
 
-MODULE_LICENSE("MIT");
+MODULE_LICENSE("GPL");
 MODULE_AUTHOR("nganhkhoa");