nganhkhoa/voidfs
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This commit is contained in:
nganhkhoa 2024-10-29 10:31:47 +00:00
parent e087715248
commit 794f72d721
2 changed files with 37 additions and 18 deletions
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5
Makefile
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@ -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

50
voidfs.c
View File

@ -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");