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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 <linux/xattr.h>
20#include <asm/uaccess.h>
21#include "hfsplus_fs.h"
22
23static int hfsplus_ioctl_getflags(struct file *file, int __user *user_flags)
24{
25 struct inode *inode = file->f_path.dentry->d_inode;
26 struct hfsplus_inode_info *hip = HFSPLUS_I(inode);
27 unsigned int flags = 0;
28
29 if (inode->i_flags & S_IMMUTABLE)
30 flags |= FS_IMMUTABLE_FL;
31 if (inode->i_flags & S_APPEND)
32 flags |= FS_APPEND_FL;
33 if (hip->userflags & HFSPLUS_FLG_NODUMP)
34 flags |= FS_NODUMP_FL;
35
36 return put_user(flags, user_flags);
37}
38
39static int hfsplus_ioctl_setflags(struct file *file, int __user *user_flags)
40{
41 struct inode *inode = file->f_path.dentry->d_inode;
42 struct hfsplus_inode_info *hip = HFSPLUS_I(inode);
43 unsigned int flags;
44 int err = 0;
45
46 err = mnt_want_write(file->f_path.mnt);
47 if (err)
48 goto out;
49
50 if (!inode_owner_or_capable(inode)) {
51 err = -EACCES;
52 goto out_drop_write;
53 }
54
55 if (get_user(flags, user_flags)) {
56 err = -EFAULT;
57 goto out_drop_write;
58 }
59
60 mutex_lock(&inode->i_mutex);
61
62 if ((flags & (FS_IMMUTABLE_FL|FS_APPEND_FL)) ||
63 inode->i_flags & (S_IMMUTABLE|S_APPEND)) {
64 if (!capable(CAP_LINUX_IMMUTABLE)) {
65 err = -EPERM;
66 goto out_unlock_inode;
67 }
68 }
69
70 /* don't silently ignore unsupported ext2 flags */
71 if (flags & ~(FS_IMMUTABLE_FL|FS_APPEND_FL|FS_NODUMP_FL)) {
72 err = -EOPNOTSUPP;
73 goto out_unlock_inode;
74 }
75
76 if (flags & FS_IMMUTABLE_FL)
77 inode->i_flags |= S_IMMUTABLE;
78 else
79 inode->i_flags &= ~S_IMMUTABLE;
80
81 if (flags & FS_APPEND_FL)
82 inode->i_flags |= S_APPEND;
83 else
84 inode->i_flags &= ~S_APPEND;
85
86 if (flags & FS_NODUMP_FL)
87 hip->userflags |= HFSPLUS_FLG_NODUMP;
88 else
89 hip->userflags &= ~HFSPLUS_FLG_NODUMP;
90
91 inode->i_ctime = CURRENT_TIME_SEC;
92 mark_inode_dirty(inode);
93
94out_unlock_inode:
95 mutex_unlock(&inode->i_mutex);
96out_drop_write:
97 mnt_drop_write(file->f_path.mnt);
98out:
99 return err;
100}
101
102long hfsplus_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
103{
104 void __user *argp = (void __user *)arg;
105
106 switch (cmd) {
107 case HFSPLUS_IOC_EXT2_GETFLAGS:
108 return hfsplus_ioctl_getflags(file, argp);
109 case HFSPLUS_IOC_EXT2_SETFLAGS:
110 return hfsplus_ioctl_setflags(file, argp);
111 default:
112 return -ENOTTY;
113 }
114}
115
116int hfsplus_setxattr(struct dentry *dentry, const char *name,
117 const void *value, size_t size, int flags)
118{
119 struct inode *inode = dentry->d_inode;
120 struct hfs_find_data fd;
121 hfsplus_cat_entry entry;
122 struct hfsplus_cat_file *file;
123 int res;
124
125 if (!S_ISREG(inode->i_mode) || HFSPLUS_IS_RSRC(inode))
126 return -EOPNOTSUPP;
127
128 res = hfs_find_init(HFSPLUS_SB(inode->i_sb)->cat_tree, &fd);
129 if (res)
130 return res;
131 res = hfsplus_find_cat(inode->i_sb, inode->i_ino, &fd);
132 if (res)
133 goto out;
134 hfs_bnode_read(fd.bnode, &entry, fd.entryoffset,
135 sizeof(struct hfsplus_cat_file));
136 file = &entry.file;
137
138 if (!strcmp(name, "hfs.type")) {
139 if (size == 4)
140 memcpy(&file->user_info.fdType, value, 4);
141 else
142 res = -ERANGE;
143 } else if (!strcmp(name, "hfs.creator")) {
144 if (size == 4)
145 memcpy(&file->user_info.fdCreator, value, 4);
146 else
147 res = -ERANGE;
148 } else
149 res = -EOPNOTSUPP;
150 if (!res) {
151 hfs_bnode_write(fd.bnode, &entry, fd.entryoffset,
152 sizeof(struct hfsplus_cat_file));
153 hfsplus_mark_inode_dirty(inode, HFSPLUS_I_CAT_DIRTY);
154 }
155out:
156 hfs_find_exit(&fd);
157 return res;
158}
159
160ssize_t hfsplus_getxattr(struct dentry *dentry, const char *name,
161 void *value, size_t size)
162{
163 struct inode *inode = dentry->d_inode;
164 struct hfs_find_data fd;
165 hfsplus_cat_entry entry;
166 struct hfsplus_cat_file *file;
167 ssize_t res = 0;
168
169 if (!S_ISREG(inode->i_mode) || HFSPLUS_IS_RSRC(inode))
170 return -EOPNOTSUPP;
171
172 if (size) {
173 res = hfs_find_init(HFSPLUS_SB(inode->i_sb)->cat_tree, &fd);
174 if (res)
175 return res;
176 res = hfsplus_find_cat(inode->i_sb, inode->i_ino, &fd);
177 if (res)
178 goto out;
179 hfs_bnode_read(fd.bnode, &entry, fd.entryoffset,
180 sizeof(struct hfsplus_cat_file));
181 }
182 file = &entry.file;
183
184 if (!strcmp(name, "hfs.type")) {
185 if (size >= 4) {
186 memcpy(value, &file->user_info.fdType, 4);
187 res = 4;
188 } else
189 res = size ? -ERANGE : 4;
190 } else if (!strcmp(name, "hfs.creator")) {
191 if (size >= 4) {
192 memcpy(value, &file->user_info.fdCreator, 4);
193 res = 4;
194 } else
195 res = size ? -ERANGE : 4;
196 } else
197 res = -EOPNOTSUPP;
198out:
199 if (size)
200 hfs_find_exit(&fd);
201 return res;
202}
203
204#define HFSPLUS_ATTRLIST_SIZE (sizeof("hfs.creator")+sizeof("hfs.type"))
205
206ssize_t hfsplus_listxattr(struct dentry *dentry, char *buffer, size_t size)
207{
208 struct inode *inode = dentry->d_inode;
209
210 if (!S_ISREG(inode->i_mode) || HFSPLUS_IS_RSRC(inode))
211 return -EOPNOTSUPP;
212
213 if (!buffer || !size)
214 return HFSPLUS_ATTRLIST_SIZE;
215 if (size < HFSPLUS_ATTRLIST_SIZE)
216 return -ERANGE;
217 strcpy(buffer, "hfs.type");
218 strcpy(buffer + sizeof("hfs.type"), "hfs.creator");
219
220 return HFSPLUS_ATTRLIST_SIZE;
221}
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(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(&sbi->vh_mutex);
57 return 0;
58}
59
60static inline unsigned int hfsplus_getflags(struct inode *inode)
61{
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 return flags;
72}
73
74static int hfsplus_ioctl_getflags(struct file *file, int __user *user_flags)
75{
76 struct inode *inode = file_inode(file);
77 unsigned int flags = hfsplus_getflags(inode);
78
79 return put_user(flags, user_flags);
80}
81
82static int hfsplus_ioctl_setflags(struct file *file, int __user *user_flags)
83{
84 struct inode *inode = file_inode(file);
85 struct hfsplus_inode_info *hip = HFSPLUS_I(inode);
86 unsigned int flags, new_fl = 0;
87 unsigned int oldflags = hfsplus_getflags(inode);
88 int err = 0;
89
90 err = mnt_want_write_file(file);
91 if (err)
92 goto out;
93
94 if (!inode_owner_or_capable(inode)) {
95 err = -EACCES;
96 goto out_drop_write;
97 }
98
99 if (get_user(flags, user_flags)) {
100 err = -EFAULT;
101 goto out_drop_write;
102 }
103
104 inode_lock(inode);
105
106 err = vfs_ioc_setflags_prepare(inode, oldflags, flags);
107 if (err)
108 goto out_unlock_inode;
109
110 /* don't silently ignore unsupported ext2 flags */
111 if (flags & ~(FS_IMMUTABLE_FL|FS_APPEND_FL|FS_NODUMP_FL)) {
112 err = -EOPNOTSUPP;
113 goto out_unlock_inode;
114 }
115
116 if (flags & FS_IMMUTABLE_FL)
117 new_fl |= S_IMMUTABLE;
118
119 if (flags & FS_APPEND_FL)
120 new_fl |= S_APPEND;
121
122 inode_set_flags(inode, new_fl, S_IMMUTABLE | S_APPEND);
123
124 if (flags & FS_NODUMP_FL)
125 hip->userflags |= HFSPLUS_FLG_NODUMP;
126 else
127 hip->userflags &= ~HFSPLUS_FLG_NODUMP;
128
129 inode->i_ctime = current_time(inode);
130 mark_inode_dirty(inode);
131
132out_unlock_inode:
133 inode_unlock(inode);
134out_drop_write:
135 mnt_drop_write_file(file);
136out:
137 return err;
138}
139
140long hfsplus_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
141{
142 void __user *argp = (void __user *)arg;
143
144 switch (cmd) {
145 case HFSPLUS_IOC_EXT2_GETFLAGS:
146 return hfsplus_ioctl_getflags(file, argp);
147 case HFSPLUS_IOC_EXT2_SETFLAGS:
148 return hfsplus_ioctl_setflags(file, argp);
149 case HFSPLUS_IOC_BLESS:
150 return hfsplus_ioctl_bless(file, argp);
151 default:
152 return -ENOTTY;
153 }
154}