Rewrite to kernel 5.15
This commit is contained in:
parent
dd5a0e207c
commit
debe83836d
2
Makefile
2
Makefile
@ -1,4 +1,4 @@
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obj-m := statsfs.o
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obj-m := libfs.o
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KDIR := /lib/modules/$(shell uname -r)/build
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PWD := $(shell pwd)
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210
libfs.c
Normal file
210
libfs.c
Normal file
@ -0,0 +1,210 @@
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/*
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* Custom Filesystem Module - Implements the described behavior for "books" and "authors" directories.
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*/
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/fs.h>
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#include <linux/pagemap.h>
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#include <linux/mount.h>
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#include <linux/namei.h>
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#include <linux/slab.h>
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#include <linux/uaccess.h>
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#include <linux/kernel.h>
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#include <linux/hashtable.h>
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#include <linux/fs_context.h>
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#define FS_MAGIC 0x20240615
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#define BOOKS_MODE 01777
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#define AUTHORS_MODE 0777
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#define AUTHOR_SUBDIR_MODE 01777
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("user");
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MODULE_DESCRIPTION("Custom FS with books and authors directories");
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static struct inode *books_inode;
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static struct inode *authors_inode;
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struct link_entry {
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struct hlist_node node;
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struct dentry *link;
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struct inode *target;
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};
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DEFINE_HASHTABLE(link_table, 6); // 64 buckets
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static void remove_links_to_inode(struct inode *inode) {
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struct link_entry *entry;
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struct hlist_node *tmp;
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int bkt;
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hash_for_each_safe(link_table, bkt, tmp, entry, node) {
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if (entry->target == inode) {
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d_delete(entry->link);
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hash_del(&entry->node);
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kfree(entry);
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}
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}
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}
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static void fs_evict_inode(struct inode *inode) {
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if (inode->i_sb && inode->i_sb->s_magic == FS_MAGIC) {
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if (S_ISREG(inode->i_mode)) {
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remove_links_to_inode(inode);
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}
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}
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truncate_inode_pages_final(&inode->i_data);
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clear_inode(inode);
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}
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static ssize_t books_file_read(struct file *file, char __user *buf, size_t len, loff_t *ppos) {
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return simple_read_from_buffer(buf, len, ppos, file->private_data, PAGE_SIZE);
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}
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static ssize_t books_file_write(struct file *file, const char __user *buf, size_t len, loff_t *ppos) {
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return simple_write_to_buffer(file->private_data, PAGE_SIZE, ppos, buf, len);
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}
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static const struct file_operations books_file_fops = {
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.read = books_file_read,
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.write = books_file_write,
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.llseek = generic_file_llseek,
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};
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static const struct inode_operations books_file_iops = {
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.getattr = simple_getattr,
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.setattr = simple_setattr,
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};
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static const struct inode_operations author_subdir_iops;
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static struct dentry *author_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags) {
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return simple_lookup(dir, dentry, flags);
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}
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static int author_mkdir(struct user_namespace *ns, struct inode *dir, struct dentry *dentry, umode_t mode) {
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struct inode *inode;
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inode = new_inode(dir->i_sb);
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if (!inode)
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return -ENOMEM;
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inode->i_ino = get_next_ino();
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inode_init_owner(ns, inode, dir, S_IFDIR | AUTHOR_SUBDIR_MODE);
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inode->i_op = &author_subdir_iops;
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inode->i_fop = &simple_dir_operations;
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d_add(dentry, inode);
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return 0;
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}
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static int author_link(struct dentry *old_dentry, struct inode *dir, struct dentry *new_dentry) {
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int err;
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struct inode *inode = d_inode(old_dentry);
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if (!S_ISREG(inode->i_mode)) return -EPERM;
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err = simple_link(old_dentry, dir, new_dentry);
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if (err == 0) {
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struct link_entry *entry = kmalloc(sizeof(*entry), GFP_KERNEL);
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if (entry) {
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entry->link = dget(new_dentry);
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entry->target = inode;
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hash_add(link_table, &entry->node, inode->i_ino);
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}
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}
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return err;
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}
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static const struct inode_operations author_subdir_iops = {
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.lookup = author_lookup,
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.mkdir = author_mkdir,
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.rmdir = simple_rmdir,
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.link = author_link,
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};
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static const struct super_operations fs_ops = {
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.evict_inode = fs_evict_inode,
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};
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static struct inode *fs_make_inode(struct super_block *sb, umode_t mode) {
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struct inode *inode = new_inode(sb);
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if (!inode)
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return NULL;
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inode->i_ino = get_next_ino();
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inode_init_owner(&init_user_ns, inode, NULL, mode);
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inode->i_sb = sb;
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inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode);
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if (S_ISDIR(mode) && !inode->i_op) {
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inode->i_op = &simple_dir_inode_operations;
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inode->i_fop = &simple_dir_operations;
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} else if (S_ISREG(mode)) {
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inode->i_fop = &books_file_fops;
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inode->i_op = &books_file_iops;
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inode->i_private = kzalloc(PAGE_SIZE, GFP_KERNEL);
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}
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return inode;
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}
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static int fs_fill_super(struct super_block *sb, void *data, int silent) {
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struct inode *root_inode;
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struct dentry *root_dentry;
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struct dentry *books_dentry;
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struct dentry *authors_dentry;
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sb->s_magic = FS_MAGIC;
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sb->s_op = &fs_ops;
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root_inode = fs_make_inode(sb, S_IFDIR | 0755);
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if (!root_inode)
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return -ENOMEM;
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root_dentry = d_make_root(root_inode);
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if (!root_dentry)
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return -ENOMEM;
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sb->s_root = root_dentry;
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books_inode = fs_make_inode(sb, S_IFDIR | BOOKS_MODE);
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if (!books_inode)
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return -ENOMEM;
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books_inode->i_op = &simple_dir_inode_operations;
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books_inode->i_fop = &simple_dir_operations;
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books_inode->i_mode |= S_IWUSR | S_IWGRP | S_IWOTH;
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books_dentry = d_alloc_name(root_dentry, "books");
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if (!books_dentry)
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return -ENOMEM;
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d_add(books_dentry, books_inode);
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authors_inode = fs_make_inode(sb, S_IFDIR | AUTHORS_MODE);
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if (!authors_inode)
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return -ENOMEM;
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authors_dentry = d_alloc_name(root_dentry, "authors");
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if (!authors_dentry)
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return -ENOMEM;
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authors_inode->i_op = &author_subdir_iops;
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d_add(authors_dentry, authors_inode);
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return 0;
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}
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static struct dentry *fs_mount(struct file_system_type *type, int flags,
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const char *dev, void *data) {
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return mount_nodev(type, flags, data, fs_fill_super);
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}
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static struct file_system_type fs_type = {
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.owner = THIS_MODULE,
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.name = "customfs",
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.mount = fs_mount,
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.kill_sb = kill_litter_super,
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};
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static int __init fs_init(void) {
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hash_init(link_table);
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return register_filesystem(&fs_type);
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}
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static void __exit fs_exit(void) {
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unregister_filesystem(&fs_type);
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}
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module_init(fs_init);
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module_exit(fs_exit);
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360
statsfs.c
360
statsfs.c
@ -1,360 +0,0 @@
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#include <linux/fs.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/namei.h>
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#include <linux/mount.h>
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#include <linux/dcache.h>
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#include <linux/list.h>
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#include <linux/err.h>
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#include <linux/mm.h>
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#include <linux/string.h>
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#include <linux/printk.h>
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#include <linux/uio.h> /* для iov_iter_count() */
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#define LIBFS_MAGIC 0xA0B0C0D0
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#define LIBFS_BOOKS_MODE 01777
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#define LIBFS_AUTHORS_MODE 0777
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#define LIBFS_SUBDIR_MODE 01777
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static struct super_block *libfs_sb;
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static struct inode *books_inode;
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static struct inode *authors_inode;
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static struct dentry *authors_dentry;
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struct link_entry {
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struct hlist_node node;
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struct dentry *link;
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};
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static void libfs_evict_inode(struct inode *inode);
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static int libfs_create(struct mnt_idmap *idmap, struct inode *dir,
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struct dentry *dentry, umode_t mode, bool excl);
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static int libfs_mkdir(struct mnt_idmap *idmap, struct inode *dir,
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struct dentry *dentry, umode_t mode);
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static int libfs_unlink(struct inode *dir, struct dentry *dentry);
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static int libfs_rmdir(struct inode *dir, struct dentry *dentry);
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static int libfs_rename(struct mnt_idmap *idmap, struct inode *old_dir,
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struct dentry *old_dentry, struct inode *new_dir,
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struct dentry *new_dentry, unsigned int flags);
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static int libfs_link(struct dentry *old_dentry, struct inode *dir,
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struct dentry *new_dentry);
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/* Обёртки с логированием */
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static ssize_t libfs_read_iter(struct kiocb *iocb, struct iov_iter *iter)
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{
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struct inode *inode = file_inode(iocb->ki_filp);
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pr_info("statsfs: READ ino#%lu pos=%lld len=%zu\n",
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inode->i_ino, iocb->ki_pos, iov_iter_count(iter));
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return generic_file_read_iter(iocb, iter);
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}
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static ssize_t libfs_write_iter(struct kiocb *iocb, struct iov_iter *iter)
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{
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struct inode *inode = file_inode(iocb->ki_filp);
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pr_info("statsfs: WRITE ino#%lu pos=%lld len=%zu\n",
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inode->i_ino, iocb->ki_pos, iov_iter_count(iter));
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return generic_file_write_iter(iocb, iter);
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}
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static const struct file_operations libfs_file_ops = {
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.read_iter = libfs_read_iter,
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.write_iter = libfs_write_iter,
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.llseek = generic_file_llseek,
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};
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static const struct inode_operations libfs_file_iops = {
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.setattr = simple_setattr,
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.getattr = simple_getattr,
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};
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static const struct inode_operations libfs_dir_iops = {
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.lookup = simple_lookup,
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.create = libfs_create,
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.unlink = libfs_unlink,
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.mkdir = libfs_mkdir,
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.rmdir = libfs_rmdir,
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.rename = libfs_rename,
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.link = libfs_link,
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.mknod = NULL,
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.symlink = NULL,
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};
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static const struct super_operations statsfs_sops = {
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.statfs = simple_statfs,
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.drop_inode = generic_delete_inode,
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.evict_inode = libfs_evict_inode,
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};
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static struct inode *libfs_get_inode(struct super_block *sb, umode_t mode)
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{
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struct inode *inode;
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pr_info("statsfs: libfs_get_inode(sb=%p, mode=%o)\n", sb, mode);
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inode = new_inode(sb);
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if (!inode) {
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pr_err("statsfs: new_inode failed for mode %o\n", mode);
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return NULL;
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}
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inode->i_ino = get_next_ino();
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inode->i_sb = sb;
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inode->i_mode = mode;
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if (S_ISDIR(mode)) {
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inode->i_op = &libfs_dir_iops;
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inode->i_fop = &simple_dir_operations;
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pr_info("statsfs: created dir inode #%lu\n", inode->i_ino);
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} else {
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inode->i_op = &libfs_file_iops;
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inode->i_fop = &libfs_file_ops;
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inode->i_private = kzalloc(sizeof(struct hlist_head), GFP_KERNEL);
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if (!inode->i_private) {
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pr_err("statsfs: kzalloc for inode #%lu failed\n", inode->i_ino);
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iput(inode);
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return NULL;
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}
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INIT_HLIST_HEAD((struct hlist_head *)inode->i_private);
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pr_info("statsfs: created file inode #%lu with private list\n",
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inode->i_ino);
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}
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return inode;
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}
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static void cleanup_links(struct inode *victim)
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{
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struct hlist_head *list;
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struct link_entry *le;
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struct hlist_node *tmp;
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if (!S_ISREG(victim->i_mode) || !victim->i_private)
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return;
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pr_info("statsfs: cleanup_links for inode #%lu\n", victim->i_ino);
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list = (struct hlist_head *)victim->i_private;
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hlist_for_each_entry_safe(le, tmp, list, node) {
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struct dentry *link = le->link;
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if (!link || d_unlinked(link)) {
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pr_info("statsfs: link gone, freeing entry\n");
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hlist_del(&le->node);
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dput(link);
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kfree(le);
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continue;
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}
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{
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struct dentry *pd = dget_parent(link);
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struct inode *parent;
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if (pd) {
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parent = d_inode(pd);
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if (WARN_ON(!parent))
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goto skip_unlink;
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inode_lock(parent);
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vfs_unlink(NULL, parent, link, NULL);
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inode_unlock(parent);
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pr_info("statsfs: unlinked %pd from parent inode #%lu\n",
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link, parent->i_ino);
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dput(pd);
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}
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}
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skip_unlink:
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hlist_del(&le->node);
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dput(link);
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kfree(le);
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}
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kfree(victim->i_private);
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victim->i_private = NULL;
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}
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static bool is_protected(const struct dentry *d)
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{
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return !strcmp(d->d_name.name, "books") ||
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!strcmp(d->d_name.name, "authors");
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}
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static int libfs_create(struct mnt_idmap *idmap, struct inode *dir,
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struct dentry *dentry, umode_t mode, bool excl)
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{
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struct inode *inode;
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pr_info("statsfs: CREATE %pd in dir inode #%lu mode=%o\n",
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dentry, dir->i_ino, mode);
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if (dir != books_inode)
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return -EPERM;
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inode = libfs_get_inode(dir->i_sb, S_IFREG | mode);
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if (!inode)
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return -ENOMEM;
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inode->i_uid = current_fsuid();
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inode->i_gid = current_fsgid();
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d_add(dentry, inode);
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pr_info("statsfs: added file %pd as inode #%lu\n",
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dentry, inode->i_ino);
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return 0;
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}
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static int libfs_unlink(struct inode *dir, struct dentry *dentry)
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{
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struct inode *victim = d_inode(dentry);
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int err;
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pr_info("statsfs: UNLINK %pd from dir inode #%lu\n",
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dentry, dir->i_ino);
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if (dir == libfs_sb->s_root->d_inode && is_protected(dentry))
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return -EPERM;
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err = simple_unlink(dir, dentry);
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if (!err && dir == books_inode)
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cleanup_links(victim);
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return err;
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}
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static int libfs_mkdir(struct mnt_idmap *idmap, struct inode *dir,
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struct dentry *dentry, umode_t mode)
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{
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struct inode *inode;
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pr_info("statsfs: MKDIR %pd in dir inode #%lu\n",
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dentry, dir->i_ino);
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if (dir == libfs_sb->s_root->d_inode || dir == books_inode)
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return -EPERM;
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if (dir != authors_inode)
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return -EPERM;
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inode = libfs_get_inode(dir->i_sb, S_IFDIR | LIBFS_SUBDIR_MODE);
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if (!inode)
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return -ENOMEM;
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inode->i_uid = current_fsuid();
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d_add(dentry, inode);
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inc_nlink(dir);
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pr_info("statsfs: created subdir %pd as inode #%lu\n",
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dentry, inode->i_ino);
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return 0;
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}
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static int libfs_rmdir(struct inode *dir, struct dentry *dentry)
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{
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pr_info("statsfs: RMDIR %pd in dir inode #%lu\n",
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dentry, dir->i_ino);
|
||||
if (dir == libfs_sb->s_root->d_inode && is_protected(dentry))
|
||||
return -EPERM;
|
||||
if (dir == authors_inode)
|
||||
return -EPERM;
|
||||
return simple_rmdir(dir, dentry);
|
||||
}
|
||||
|
||||
static int libfs_rename(struct mnt_idmap *idmap, struct inode *odir,
|
||||
struct dentry *odent, struct inode *ndir,
|
||||
struct dentry *ndent, unsigned int flags)
|
||||
{
|
||||
pr_info("statsfs: RENAME %pd(ino#%lu) -> %pd(ino#%lu)\n",
|
||||
odent, odir->i_ino, ndent, ndir->i_ino);
|
||||
if ((odir == libfs_sb->s_root->d_inode || ndir == libfs_sb->s_root->d_inode) &&
|
||||
(is_protected(odent) || is_protected(ndent)))
|
||||
return -EPERM;
|
||||
if (odir == authors_inode || ndir == authors_inode)
|
||||
return -EPERM;
|
||||
return simple_rename(idmap, odir, odent, ndir, ndent, flags);
|
||||
}
|
||||
|
||||
static int libfs_link(struct dentry *old_dentry, struct inode *dir,
|
||||
struct dentry *new_dentry)
|
||||
{
|
||||
struct inode *t = d_inode(old_dentry);
|
||||
struct link_entry *le;
|
||||
int err;
|
||||
pr_info("statsfs: LINK %pd -> %pd in dir inode #%lu\n",
|
||||
old_dentry, new_dentry, dir->i_ino);
|
||||
if (!S_ISREG(t->i_mode))
|
||||
return -EPERM;
|
||||
if (!authors_dentry ||
|
||||
new_dentry->d_parent->d_parent != authors_dentry)
|
||||
return -EPERM;
|
||||
|
||||
err = simple_link(old_dentry, dir, new_dentry);
|
||||
if (err)
|
||||
return err;
|
||||
|
||||
le = kmalloc(sizeof(*le), GFP_KERNEL);
|
||||
if (!le)
|
||||
return -ENOMEM;
|
||||
|
||||
le->link = dget(new_dentry);
|
||||
hlist_add_head(&le->node, (struct hlist_head *)t->i_private);
|
||||
pr_info("statsfs: recorded link entry for inode #%lu\n", t->i_ino);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int libfs_fill_super(struct super_block *sb, void *data, int silent)
|
||||
{
|
||||
struct inode *root;
|
||||
pr_info("statsfs: fill_super\n");
|
||||
libfs_sb = sb;
|
||||
sb->s_magic = LIBFS_MAGIC;
|
||||
sb->s_op = &statsfs_sops;
|
||||
|
||||
root = libfs_get_inode(sb, S_IFDIR | 0755);
|
||||
if (!root)
|
||||
return -ENOMEM;
|
||||
|
||||
root->i_op = &libfs_dir_iops;
|
||||
root->i_fop = &simple_dir_operations;
|
||||
sb->s_root = d_make_root(root);
|
||||
if (!sb->s_root)
|
||||
return -ENOMEM;
|
||||
|
||||
books_inode = libfs_get_inode(sb, S_IFDIR | LIBFS_BOOKS_MODE);
|
||||
d_add(d_alloc_name(sb->s_root, "books"), books_inode);
|
||||
|
||||
authors_inode = libfs_get_inode(sb, S_IFDIR | LIBFS_AUTHORS_MODE);
|
||||
authors_dentry = d_alloc_name(sb->s_root, "authors");
|
||||
d_add(authors_dentry, authors_inode);
|
||||
|
||||
pr_info("statsfs: superblock initialized\n");
|
||||
return 0;
|
||||
}
|
||||
|
||||
static struct dentry *libfs_mount(struct file_system_type *fs,
|
||||
int flags, const char *dev, void *data)
|
||||
{
|
||||
pr_info("statsfs: mounting\n");
|
||||
return mount_nodev(fs, flags, data, libfs_fill_super);
|
||||
}
|
||||
|
||||
static void libfs_evict_inode(struct inode *inode)
|
||||
{
|
||||
pr_info("statsfs: evict_inode ino#%lu\n", inode->i_ino);
|
||||
truncate_inode_pages_final(&inode->i_data);
|
||||
cleanup_links(inode);
|
||||
clear_inode(inode);
|
||||
}
|
||||
|
||||
static struct file_system_type libfs_type = {
|
||||
.owner = THIS_MODULE,
|
||||
.name = "statsfs",
|
||||
.mount = libfs_mount,
|
||||
.kill_sb = kill_litter_super,
|
||||
};
|
||||
|
||||
static int __init libfs_init(void)
|
||||
{
|
||||
pr_info("statsfs: module init\n");
|
||||
return register_filesystem(&libfs_type);
|
||||
}
|
||||
|
||||
static void __exit libfs_exit(void)
|
||||
{
|
||||
pr_info("statsfs: module exit\n");
|
||||
dput(authors_dentry);
|
||||
cleanup_links(books_inode);
|
||||
iput(books_inode);
|
||||
iput(authors_inode);
|
||||
unregister_filesystem(&libfs_type);
|
||||
}
|
||||
|
||||
module_init(libfs_init);
|
||||
module_exit(libfs_exit);
|
||||
|
||||
MODULE_LICENSE("GPL");
|
||||
MODULE_AUTHOR("you");
|
||||
MODULE_DESCRIPTION("Custom library FS with books and authors (with debug logs)");
|
||||
Loading…
x
Reference in New Issue
Block a user