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15#include <linux/compat.h>
16#include <linux/mount.h>
17#include "ubifs.h"
18
19
20#define UBIFS_SUPPORTED_IOCTL_FLAGS \
21 (FS_COMPR_FL | FS_SYNC_FL | FS_APPEND_FL | \
22 FS_IMMUTABLE_FL | FS_DIRSYNC_FL)
23
24
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27
28
29
30void ubifs_set_inode_flags(struct inode *inode)
31{
32 unsigned int flags = ubifs_inode(inode)->flags;
33
34 inode->i_flags &= ~(S_SYNC | S_APPEND | S_IMMUTABLE | S_DIRSYNC |
35 S_ENCRYPTED);
36 if (flags & UBIFS_SYNC_FL)
37 inode->i_flags |= S_SYNC;
38 if (flags & UBIFS_APPEND_FL)
39 inode->i_flags |= S_APPEND;
40 if (flags & UBIFS_IMMUTABLE_FL)
41 inode->i_flags |= S_IMMUTABLE;
42 if (flags & UBIFS_DIRSYNC_FL)
43 inode->i_flags |= S_DIRSYNC;
44 if (flags & UBIFS_CRYPT_FL)
45 inode->i_flags |= S_ENCRYPTED;
46}
47
48
49
50
51
52
53
54
55static int ioctl2ubifs(int ioctl_flags)
56{
57 int ubifs_flags = 0;
58
59 if (ioctl_flags & FS_COMPR_FL)
60 ubifs_flags |= UBIFS_COMPR_FL;
61 if (ioctl_flags & FS_SYNC_FL)
62 ubifs_flags |= UBIFS_SYNC_FL;
63 if (ioctl_flags & FS_APPEND_FL)
64 ubifs_flags |= UBIFS_APPEND_FL;
65 if (ioctl_flags & FS_IMMUTABLE_FL)
66 ubifs_flags |= UBIFS_IMMUTABLE_FL;
67 if (ioctl_flags & FS_DIRSYNC_FL)
68 ubifs_flags |= UBIFS_DIRSYNC_FL;
69
70 return ubifs_flags;
71}
72
73
74
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76
77
78
79
80static int ubifs2ioctl(int ubifs_flags)
81{
82 int ioctl_flags = 0;
83
84 if (ubifs_flags & UBIFS_COMPR_FL)
85 ioctl_flags |= FS_COMPR_FL;
86 if (ubifs_flags & UBIFS_SYNC_FL)
87 ioctl_flags |= FS_SYNC_FL;
88 if (ubifs_flags & UBIFS_APPEND_FL)
89 ioctl_flags |= FS_APPEND_FL;
90 if (ubifs_flags & UBIFS_IMMUTABLE_FL)
91 ioctl_flags |= FS_IMMUTABLE_FL;
92 if (ubifs_flags & UBIFS_DIRSYNC_FL)
93 ioctl_flags |= FS_DIRSYNC_FL;
94
95 return ioctl_flags;
96}
97
98static int setflags(struct inode *inode, int flags)
99{
100 int oldflags, err, release;
101 struct ubifs_inode *ui = ubifs_inode(inode);
102 struct ubifs_info *c = inode->i_sb->s_fs_info;
103 struct ubifs_budget_req req = { .dirtied_ino = 1,
104 .dirtied_ino_d = ui->data_len };
105
106 err = ubifs_budget_space(c, &req);
107 if (err)
108 return err;
109
110 mutex_lock(&ui->ui_mutex);
111 oldflags = ubifs2ioctl(ui->flags);
112 err = vfs_ioc_setflags_prepare(inode, oldflags, flags);
113 if (err)
114 goto out_unlock;
115
116 ui->flags = ioctl2ubifs(flags);
117 ubifs_set_inode_flags(inode);
118 inode->i_ctime = current_time(inode);
119 release = ui->dirty;
120 mark_inode_dirty_sync(inode);
121 mutex_unlock(&ui->ui_mutex);
122
123 if (release)
124 ubifs_release_budget(c, &req);
125 if (IS_SYNC(inode))
126 err = write_inode_now(inode, 1);
127 return err;
128
129out_unlock:
130 ubifs_err(c, "can't modify inode %lu attributes", inode->i_ino);
131 mutex_unlock(&ui->ui_mutex);
132 ubifs_release_budget(c, &req);
133 return err;
134}
135
136long ubifs_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
137{
138 int flags, err;
139 struct inode *inode = file_inode(file);
140
141 switch (cmd) {
142 case FS_IOC_GETFLAGS:
143 flags = ubifs2ioctl(ubifs_inode(inode)->flags);
144
145 dbg_gen("get flags: %#x, i_flags %#x", flags, inode->i_flags);
146 return put_user(flags, (int __user *) arg);
147
148 case FS_IOC_SETFLAGS: {
149 if (IS_RDONLY(inode))
150 return -EROFS;
151
152 if (!inode_owner_or_capable(inode))
153 return -EACCES;
154
155 if (get_user(flags, (int __user *) arg))
156 return -EFAULT;
157
158 if (flags & ~UBIFS_SUPPORTED_IOCTL_FLAGS)
159 return -EOPNOTSUPP;
160
161 if (!S_ISDIR(inode->i_mode))
162 flags &= ~FS_DIRSYNC_FL;
163
164
165
166
167
168 err = mnt_want_write_file(file);
169 if (err)
170 return err;
171 dbg_gen("set flags: %#x, i_flags %#x", flags, inode->i_flags);
172 err = setflags(inode, flags);
173 mnt_drop_write_file(file);
174 return err;
175 }
176 case FS_IOC_SET_ENCRYPTION_POLICY: {
177 struct ubifs_info *c = inode->i_sb->s_fs_info;
178
179 err = ubifs_enable_encryption(c);
180 if (err)
181 return err;
182
183 return fscrypt_ioctl_set_policy(file, (const void __user *)arg);
184 }
185 case FS_IOC_GET_ENCRYPTION_POLICY:
186 return fscrypt_ioctl_get_policy(file, (void __user *)arg);
187
188 default:
189 return -ENOTTY;
190 }
191}
192
193#ifdef CONFIG_COMPAT
194long ubifs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
195{
196 switch (cmd) {
197 case FS_IOC32_GETFLAGS:
198 cmd = FS_IOC_GETFLAGS;
199 break;
200 case FS_IOC32_SETFLAGS:
201 cmd = FS_IOC_SETFLAGS;
202 break;
203 case FS_IOC_SET_ENCRYPTION_POLICY:
204 case FS_IOC_GET_ENCRYPTION_POLICY:
205 break;
206 default:
207 return -ENOIOCTLCMD;
208 }
209 return ubifs_ioctl(file, cmd, (unsigned long)compat_ptr(arg));
210}
211#endif
212