From 16df2ac01e3e8ecac35463678f2471b29422d004 Mon Sep 17 00:00:00 2001
From: c4llv07e <igor@c4llv07e.xyz>
Date: Tue, 6 May 2025 20:43:06 +0300
Subject: Some progress

---
 etcfs.c | 61 +++++++++++++++++++++++++++++++++++++++++++++++++++++--------
 1 file changed, 53 insertions(+), 8 deletions(-)

diff --git a/etcfs.c b/etcfs.c
index 82e7220..4440e05 100644
--- a/etcfs.c
+++ b/etcfs.c
@@ -1,39 +1,84 @@
+#define DEBUG
+#define ETCFS_MAGIC 0x49c643f4 /* random number */
 #include <linux/module.h>
 #include <linux/kernel.h>
 #include <linux/fs.h>
 #include <linux/fs_context.h>
+#include <linux/dcache.h>
+#include <linux/mnt_idmapping.h>
+
+#if 0
+static const struct super_operations etcfs_ops = {
+
+};
+#endif
+
+static int etcfs_fill_super(struct super_block *sb, strcut fc_context *fc) {
+	struct inode *inode;
+	sb->s_maxbytes = MAX_LFS_FILESIZE;
+	sb->s_blocksize = PAGE_SIZE;
+	sb->s_blocksize_bits = PAGE_SHIFT;
+	sb->s_magic = ETCFS_MAGIC;
+	sb->s_time_gran = 1; /* I have no idea what is's doing */
+
+	inode = new_inode(sb);
+
+	if (!inode)
+		return -ENOMEM;
+
+	inode->i_ino = get_next_ino();
+	inode_init_owner(&nop_mnt_idmap, inode, NULL, S_IFDIR);
+	inode->i_mapping->a_ops = &ram_aops;
+	/*
+	mapping_set_gfp_mask(inode->i_mapping, GFP_HIGHUSER);
+	mapping_set_unevictable(inode->i_mapping);
+	*/
+	simple_inode_init_ts(inode);
+
+	sb->s_root = d_make_root(inode);
+	if (!sb->s_root)
+		return -ENOMEM;
+	return 0;
+}
+
+static int etcfs_get_tree(struct fs_context *fc) {
+	pr_debug("Get tree\n");
+	return get_tree_nodev(fc, etcfs_fill_super);
+}
 
 static struct fs_context_operations etcfs_context_ops = {
+	.get_tree = etcfs_get_tree,
 };
 
 static int etcfs_init_fs_context(struct fs_context *fc) {
-	int err;
+	pr_debug("Etcfs init fs context\n");
 	fc->ops = &etcfs_context_ops;
 	return 0;
 }
 
-static struct file_system_type etc_fs_type = {
+static struct file_system_type etcfs_fs_type = {
 	.name = "etcfs",
-	.f_flasgs = FS_USERNS_MOUNT,
+	.fs_flags = FS_USERNS_MOUNT,
 	.init_fs_context = etcfs_init_fs_context,
 };
 
 static int __init etcfs_init(void) {
 	int err;
-	err = register_filesystem(etcfs);
+	err = register_filesystem(&etcfs_fs_type);
 	if (err) {
 		return err;
 	}
 	return 0;
 }
 
-static int __exit etcfs_exit(void) {
+static void __exit etcfs_exit(void) {
 	int err;
-	err = unregister_filesystem(etcfs);
+	err = unregister_filesystem(&etcfs_fs_type);
 	if (err) {
-		return err;
+		pr_err("Error, can't unregister filesystem: %d\n", err);
+		return;
 	}
-	return 0;
+	return;
 }
 
 module_init(etcfs_init);
-- 
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