1 | // SPDX-License-Identifier: GPL-2.0 |
---|---|
2 | /* |
3 | * linux/fs/hfsplus/ioctl.c |
4 | * |
5 | * Copyright (C) 2003 |
6 | * Ethan Benson <erbenson@alaska.net> |
7 | * partially derived from linux/fs/ext2/ioctl.c |
8 | * Copyright (C) 1993, 1994, 1995 |
9 | * Remy Card (card@masi.ibp.fr) |
10 | * Laboratoire MASI - Institut Blaise Pascal |
11 | * Universite Pierre et Marie Curie (Paris VI) |
12 | * |
13 | * hfsplus ioctls |
14 | */ |
15 | |
16 | #include <linux/capability.h> |
17 | #include <linux/fs.h> |
18 | #include <linux/mount.h> |
19 | #include <linux/sched.h> |
20 | #include <linux/uaccess.h> |
21 | #include "hfsplus_fs.h" |
22 | |
23 | /* |
24 | * "Blessing" an HFS+ filesystem writes metadata to the superblock informing |
25 | * the platform firmware which file to boot from |
26 | */ |
27 | static int hfsplus_ioctl_bless(struct file *file, int __user *user_flags) |
28 | { |
29 | struct dentry *dentry = file->f_path.dentry; |
30 | struct inode *inode = d_inode(dentry); |
31 | struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb: inode->i_sb); |
32 | struct hfsplus_vh *vh = sbi->s_vhdr; |
33 | struct hfsplus_vh *bvh = sbi->s_backup_vhdr; |
34 | u32 cnid = (unsigned long)dentry->d_fsdata; |
35 | |
36 | if (!capable(CAP_SYS_ADMIN)) |
37 | return -EPERM; |
38 | |
39 | mutex_lock(&sbi->vh_mutex); |
40 | |
41 | /* Directory containing the bootable system */ |
42 | vh->finder_info[0] = bvh->finder_info[0] = |
43 | cpu_to_be32(parent_ino(dentry)); |
44 | |
45 | /* |
46 | * Bootloader. Just using the inode here breaks in the case of |
47 | * hard links - the firmware wants the ID of the hard link file, |
48 | * but the inode points at the indirect inode |
49 | */ |
50 | vh->finder_info[1] = bvh->finder_info[1] = cpu_to_be32(cnid); |
51 | |
52 | /* Per spec, the OS X system folder - same as finder_info[0] here */ |
53 | vh->finder_info[5] = bvh->finder_info[5] = |
54 | cpu_to_be32(parent_ino(dentry)); |
55 | |
56 | mutex_unlock(lock: &sbi->vh_mutex); |
57 | return 0; |
58 | } |
59 | |
60 | long hfsplus_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
61 | { |
62 | void __user *argp = (void __user *)arg; |
63 | |
64 | switch (cmd) { |
65 | case HFSPLUS_IOC_BLESS: |
66 | return hfsplus_ioctl_bless(file, user_flags: argp); |
67 | default: |
68 | return -ENOTTY; |
69 | } |
70 | } |
71 |