Loading...
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 */
27static 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(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(d_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(d_parent_ino(dentry));
55
56 mutex_unlock(&sbi->vh_mutex);
57 return 0;
58}
59
60long 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, argp);
67 default:
68 return -ENOTTY;
69 }
70}
1/*
2 * linux/fs/hfsplus/ioctl.c
3 *
4 * Copyright (C) 2003
5 * Ethan Benson <erbenson@alaska.net>
6 * partially derived from linux/fs/ext2/ioctl.c
7 * Copyright (C) 1993, 1994, 1995
8 * Remy Card (card@masi.ibp.fr)
9 * Laboratoire MASI - Institut Blaise Pascal
10 * Universite Pierre et Marie Curie (Paris VI)
11 *
12 * hfsplus ioctls
13 */
14
15#include <linux/capability.h>
16#include <linux/fs.h>
17#include <linux/mount.h>
18#include <linux/sched.h>
19#include <asm/uaccess.h>
20#include "hfsplus_fs.h"
21
22/*
23 * "Blessing" an HFS+ filesystem writes metadata to the superblock informing
24 * the platform firmware which file to boot from
25 */
26static int hfsplus_ioctl_bless(struct file *file, int __user *user_flags)
27{
28 struct dentry *dentry = file->f_path.dentry;
29 struct inode *inode = d_inode(dentry);
30 struct hfsplus_sb_info *sbi = HFSPLUS_SB(inode->i_sb);
31 struct hfsplus_vh *vh = sbi->s_vhdr;
32 struct hfsplus_vh *bvh = sbi->s_backup_vhdr;
33 u32 cnid = (unsigned long)dentry->d_fsdata;
34
35 if (!capable(CAP_SYS_ADMIN))
36 return -EPERM;
37
38 mutex_lock(&sbi->vh_mutex);
39
40 /* Directory containing the bootable system */
41 vh->finder_info[0] = bvh->finder_info[0] =
42 cpu_to_be32(parent_ino(dentry));
43
44 /*
45 * Bootloader. Just using the inode here breaks in the case of
46 * hard links - the firmware wants the ID of the hard link file,
47 * but the inode points at the indirect inode
48 */
49 vh->finder_info[1] = bvh->finder_info[1] = cpu_to_be32(cnid);
50
51 /* Per spec, the OS X system folder - same as finder_info[0] here */
52 vh->finder_info[5] = bvh->finder_info[5] =
53 cpu_to_be32(parent_ino(dentry));
54
55 mutex_unlock(&sbi->vh_mutex);
56 return 0;
57}
58
59static int hfsplus_ioctl_getflags(struct file *file, int __user *user_flags)
60{
61 struct inode *inode = file_inode(file);
62 struct hfsplus_inode_info *hip = HFSPLUS_I(inode);
63 unsigned int flags = 0;
64
65 if (inode->i_flags & S_IMMUTABLE)
66 flags |= FS_IMMUTABLE_FL;
67 if (inode->i_flags & S_APPEND)
68 flags |= FS_APPEND_FL;
69 if (hip->userflags & HFSPLUS_FLG_NODUMP)
70 flags |= FS_NODUMP_FL;
71
72 return put_user(flags, user_flags);
73}
74
75static int hfsplus_ioctl_setflags(struct file *file, int __user *user_flags)
76{
77 struct inode *inode = file_inode(file);
78 struct hfsplus_inode_info *hip = HFSPLUS_I(inode);
79 unsigned int flags, new_fl = 0;
80 int err = 0;
81
82 err = mnt_want_write_file(file);
83 if (err)
84 goto out;
85
86 if (!inode_owner_or_capable(inode)) {
87 err = -EACCES;
88 goto out_drop_write;
89 }
90
91 if (get_user(flags, user_flags)) {
92 err = -EFAULT;
93 goto out_drop_write;
94 }
95
96 inode_lock(inode);
97
98 if ((flags & (FS_IMMUTABLE_FL|FS_APPEND_FL)) ||
99 inode->i_flags & (S_IMMUTABLE|S_APPEND)) {
100 if (!capable(CAP_LINUX_IMMUTABLE)) {
101 err = -EPERM;
102 goto out_unlock_inode;
103 }
104 }
105
106 /* don't silently ignore unsupported ext2 flags */
107 if (flags & ~(FS_IMMUTABLE_FL|FS_APPEND_FL|FS_NODUMP_FL)) {
108 err = -EOPNOTSUPP;
109 goto out_unlock_inode;
110 }
111
112 if (flags & FS_IMMUTABLE_FL)
113 new_fl |= S_IMMUTABLE;
114
115 if (flags & FS_APPEND_FL)
116 new_fl |= S_APPEND;
117
118 inode_set_flags(inode, new_fl, S_IMMUTABLE | S_APPEND);
119
120 if (flags & FS_NODUMP_FL)
121 hip->userflags |= HFSPLUS_FLG_NODUMP;
122 else
123 hip->userflags &= ~HFSPLUS_FLG_NODUMP;
124
125 inode->i_ctime = CURRENT_TIME_SEC;
126 mark_inode_dirty(inode);
127
128out_unlock_inode:
129 inode_unlock(inode);
130out_drop_write:
131 mnt_drop_write_file(file);
132out:
133 return err;
134}
135
136long hfsplus_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
137{
138 void __user *argp = (void __user *)arg;
139
140 switch (cmd) {
141 case HFSPLUS_IOC_EXT2_GETFLAGS:
142 return hfsplus_ioctl_getflags(file, argp);
143 case HFSPLUS_IOC_EXT2_SETFLAGS:
144 return hfsplus_ioctl_setflags(file, argp);
145 case HFSPLUS_IOC_BLESS:
146 return hfsplus_ioctl_bless(file, argp);
147 default:
148 return -ENOTTY;
149 }
150}