butterflyfs/butterflyfs.c

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/fs.h>

#include "butterfly.h"

static struct file_system_type butterfly_fs = {
    .owner          = THIS_MODULE,
    .name           = "butterflyfs",
    .fs_flags       = FS_REQUIRES_DEV,

    .mount          = butterfly_mount,
    .kill_sb        = butterfly_unmount
};

static struct dentry_operations dirOperations = {
};

static struct file_operations fileOperations = {
};

int butterfly_fill_super(struct super_block *sb, void *data, int silent)
{
    struct tree_descr treeDescr[] = {
        { }, // Skip
        { .name = "", .ops = NULL, .mode = 0 } // End
    };

    return simple_fill_super(sb, BUTTERFLY_MAGIC, treeDescr);
}

struct dentry   *butterfly_mount(
        struct file_system_type *fs,
        int flags,
        const char *devname,
        void *data)
{
    return mount_bdev(fs, flags, devname, data, butterfly_fill_super);
}

void butterfly_unmount(struct super_block *sb)
{
    kill_block_super(sb);
}

static int __init butterfly_init(void)
{
    printk(KERN_INFO "INIT");
    return register_filesystem(&butterfly_fs);
}

static void __exit butterfly_cleanup(void)
{
    unregister_filesystem(&butterfly_fs);
}

module_init(butterfly_init);
module_exit(butterfly_cleanup);