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/* SPDX-License-Identifier: GPL-2.0-or-later */
/* Copyright (C) 2026 Richard Qin */
/*
* vfs_init.cc — Bootstrap the VFS: mount ramfs root, set global root
*
* Called from kernel_main() after slab_init() and ramfs_init().
* This is the moral equivalent of Linux's vfs_caches_init() +
* mnt_init() + init_rootfs().
*/
#include <lume/fs.h>
#include <lume/dcache.h>
#include <lume/file.h>
#include <lume/mount.h>
#include <lume/fdtable.h>
#include <lume/fs_struct.h>
#include <lume/klog.h>
#include <lume/kprintf.h>
#include <lume/task.h>
#include <lume/sched.h>
/* ================================================================== */
/* vfs_init — mount ramfs as root filesystem */
/* ================================================================== */
/*
* ramfs_mount is called internally via the file_system_type::mount
* callback registered by ramfs_init(). We look it up by name.
*/
extern file_system_type* get_fs_type(const char* name);
extern super_block* alloc_super(file_system_type* type);
void vfs_init()
{
/* 1. Look up the ramfs filesystem type */
file_system_type* ramfs_type = get_fs_type("ramfs");
if (!ramfs_type || !ramfs_type->mount) {
printk(KERN_ERR "vfs_init: ramfs not registered!\n");
return;
}
/* 2. Mount ramfs */
super_block* sb = ramfs_type->mount(ramfs_type, 0, "ramfs", nullptr);
if (!sb || !sb->s_root) {
printk(KERN_ERR "vfs_init: failed to mount ramfs!\n");
return;
}
/* 3. Set global root */
g_root_dentry = sb->s_root;
g_root_mnt = nullptr; /* TODO: allocate a proper vfsmount when mount.cc lands */
dget(g_root_dentry); /* Hold a reference for the global root */
printk(KERN_INFO "[vfs] root filesystem mounted (ramfs)\n");
/* 4. Set up VFS state for the current (BSP idle) task,
* which will be inherited by all subsequently created tasks. */
TaskControlBlock* bsp = current_task();
if (bsp) {
if (!bsp->files) {
bsp->files = alloc_files_struct();
}
if (!bsp->fs) {
bsp->fs = alloc_fs_struct();
if (bsp->fs) {
bsp->fs->root.de = g_root_dentry;
bsp->fs->root.mnt = g_root_mnt;
bsp->fs->pwd.de = g_root_dentry;
bsp->fs->pwd.mnt = g_root_mnt;
dget(g_root_dentry); /* root ref */
dget(g_root_dentry); /* pwd ref */
}
}
printk(KERN_INFO "[vfs] BSP task VFS context initialized\n");
}
}
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