aboutsummaryrefslogtreecommitdiff
path: root/fs/hfsplus/ioctl.c
blob: 40a85a3ded6efe6a0a17d08fe2b068ba6b4e369a (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
/*
 *  linux/fs/hfsplus/ioctl.c
 *
 * Copyright (C) 2003
 * Ethan Benson <erbenson@alaska.net>
 * partially derived from linux/fs/ext2/ioctl.c
 * Copyright (C) 1993, 1994, 1995
 * Remy Card (card@masi.ibp.fr)
 * Laboratoire MASI - Institut Blaise Pascal
 * Universite Pierre et Marie Curie (Paris VI)
 *
 * hfsplus ioctls
 */

#include <linux/capability.h>
#include <linux/fs.h>
#include <linux/mount.h>
#include <linux/sched.h>
#include <linux/xattr.h>
#include <asm/uaccess.h>
#include "hfsplus_fs.h"

static int hfsplus_ioctl_getflags(struct file *file, int __user *user_flags)
{
	struct inode *inode = file->f_path.dentry->d_inode;
	struct hfsplus_inode_info *hip = HFSPLUS_I(inode);
	unsigned int flags = 0;

	if (inode->i_flags & S_IMMUTABLE)
		flags |= FS_IMMUTABLE_FL;
	if (inode->i_flags |= S_APPEND)
		flags |= FS_APPEND_FL;
	if (hip->userflags & HFSPLUS_FLG_NODUMP)
		flags |= FS_NODUMP_FL;

	return put_user(flags, user_flags);
}

static int hfsplus_ioctl_setflags(struct file *file, int __user *user_flags)
{
	struct inode *inode = file->f_path.dentry->d_inode;
	struct hfsplus_inode_info *hip = HFSPLUS_I(inode);
	unsigned int flags;
	int err = 0;

	err = mnt_want_write(file->f_path.mnt);
	if (err)
		goto out;

	if (!is_owner_or_cap(inode)) {
		err = -EACCES;
		goto out_drop_write;
	}

	if (get_user(flags, user_flags)) {
		err = -EFAULT;
		goto out_drop_write;
	}

	mutex_lock(&inode->i_mutex);

	if ((flags & (FS_IMMUTABLE_FL|FS_APPEND_FL)) ||
	    inode->i_flags & (S_IMMUTABLE|S_APPEND)) {
		if (!capable(CAP_LINUX_IMMUTABLE)) {
			err = -EPERM;
			goto out_unlock_inode;
		}
	}

	/* don't silently ignore unsupported ext2 flags */
	if (flags & ~(FS_IMMUTABLE_FL|FS_APPEND_FL|FS_NODUMP_FL)) {
		err = -EOPNOTSUPP;
		goto out_unlock_inode;
	}

	if (flags & FS_IMMUTABLE_FL)
		inode->i_flags |= S_IMMUTABLE;
	else
		inode->i_flags &= ~S_IMMUTABLE;

	if (flags & FS_APPEND_FL)
		inode->i_flags |= S_APPEND;
	else
		inode->i_flags &= ~S_APPEND;

	if (flags & FS_NODUMP_FL)
		hip->userflags |= HFSPLUS_FLG_NODUMP;
	else
		hip->userflags &= ~HFSPLUS_FLG_NODUMP;

	inode->i_ctime = CURRENT_TIME_SEC;
	mark_inode_dirty(inode);

out_unlock_inode:
	mutex_unlock(&inode->i_mutex);
out_drop_write:
	mnt_drop_write(file->f_path.mnt);
out:
	return err;
}

long hfsplus_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
	void __user *argp = (void __user *)arg;

	switch (cmd) {
	case HFSPLUS_IOC_EXT2_GETFLAGS:
		return hfsplus_ioctl_getflags(file, argp);
	case HFSPLUS_IOC_EXT2_SETFLAGS:
		return hfsplus_ioctl_setflags(file, argp);
	default:
		return -ENOTTY;
	}
}

int hfsplus_setxattr(struct dentry *dentry, const char *name,
		     const void *value, size_t size, int flags)
{
	struct inode *inode = dentry->d_inode;
	struct hfs_find_data fd;
	hfsplus_cat_entry entry;
	struct hfsplus_cat_file *file;
	int res;

	if (!S_ISREG(inode->i_mode) || HFSPLUS_IS_RSRC(inode))
		return -EOPNOTSUPP;

	res = hfs_find_init(HFSPLUS_SB(inode->i_sb)->cat_tree, &fd);
	if (res)
		return res;
	res = hfsplus_find_cat(inode->i_sb, inode->i_ino, &fd);
	if (res)
		goto out;
	hfs_bnode_read(fd.bnode, &entry, fd.entryoffset,
			sizeof(struct hfsplus_cat_file));
	file = &entry.file;

	if (!strcmp(name, "hfs.type")) {
		if (size == 4)
			memcpy(&file->user_info.fdType, value, 4);
		else
			res = -ERANGE;
	} else if (!strcmp(name, "hfs.creator")) {
		if (size == 4)
			memcpy(&file->user_info.fdCreator, value, 4);
		else
			res = -ERANGE;
	} else
		res = -EOPNOTSUPP;
	if (!res)
		hfs_bnode_write(fd.bnode, &entry, fd.entryoffset,
				sizeof(struct hfsplus_cat_file));
out:
	hfs_find_exit(&fd);
	return res;
}

ssize_t hfsplus_getxattr(struct dentry *dentry, const char *name,
			 void *value, size_t size)
{
	struct inode *inode = dentry->d_inode;
	struct hfs_find_data fd;
	hfsplus_cat_entry entry;
	struct hfsplus_cat_file *file;
	ssize_t res = 0;

	if (!S_ISREG(inode->i_mode) || HFSPLUS_IS_RSRC(inode))
		return -EOPNOTSUPP;

	if (size) {
		res = hfs_find_init(HFSPLUS_SB(inode->i_sb)->cat_tree, &fd);
		if (res)
			return res;
		res = hfsplus_find_cat(inode->i_sb, inode->i_ino, &fd);
		if (res)
			goto out;
		hfs_bnode_read(fd.bnode, &entry, fd.entryoffset,
				sizeof(struct hfsplus_cat_file));
	}
	file = &entry.file;

	if (!strcmp(name, "hfs.type")) {
		if (size >= 4) {
			memcpy(value, &file->user_info.fdType, 4);
			res = 4;
		} else
			res = size ? -ERANGE : 4;
	} else if (!strcmp(name, "hfs.creator")) {
		if (size >= 4) {
			memcpy(value, &file->user_info.fdCreator, 4);
			res = 4;
		} else
			res = size ? -ERANGE : 4;
	} else
		res = -EOPNOTSUPP;
out:
	if (size)
		hfs_find_exit(&fd);
	return res;
}

#define HFSPLUS_ATTRLIST_SIZE (sizeof("hfs.creator")+sizeof("hfs.type"))

ssize_t hfsplus_listxattr(struct dentry *dentry, char *buffer, size_t size)
{
	struct inode *inode = dentry->d_inode;

	if (!S_ISREG(inode->i_mode) || HFSPLUS_IS_RSRC(inode))
		return -EOPNOTSUPP;

	if (!buffer || !size)
		return HFSPLUS_ATTRLIST_SIZE;
	if (size < HFSPLUS_ATTRLIST_SIZE)
		return -ERANGE;
	strcpy(buffer, "hfs.type");
	strcpy(buffer + sizeof("hfs.type"), "hfs.creator");

	return HFSPLUS_ATTRLIST_SIZE;
}