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2b27bdcc | 1 | // SPDX-License-Identifier: GPL-2.0-only |
1e51764a AB |
2 | /* |
3 | * This file is part of UBIFS. | |
4 | * | |
5 | * Copyright (C) 2006-2008 Nokia Corporation. | |
6 | * Copyright (C) 2006, 2007 University of Szeged, Hungary | |
7 | * | |
1e51764a AB |
8 | * Authors: Zoltan Sogor |
9 | * Artem Bityutskiy (Битюцкий Артём) | |
10 | * Adrian Hunter | |
11 | */ | |
12 | ||
13 | /* This file implements EXT2-compatible extended attribute ioctl() calls */ | |
14 | ||
15 | #include <linux/compat.h> | |
1e51764a AB |
16 | #include <linux/mount.h> |
17 | #include "ubifs.h" | |
18 | ||
2fe8b2d5 HT |
19 | /* Need to be kept consistent with checked flags in ioctl2ubifs() */ |
20 | #define UBIFS_SUPPORTED_IOCTL_FLAGS \ | |
21 | (FS_COMPR_FL | FS_SYNC_FL | FS_APPEND_FL | \ | |
22 | FS_IMMUTABLE_FL | FS_DIRSYNC_FL) | |
23 | ||
1e51764a AB |
24 | /** |
25 | * ubifs_set_inode_flags - set VFS inode flags. | |
26 | * @inode: VFS inode to set flags for | |
27 | * | |
28 | * This function propagates flags from UBIFS inode object to VFS inode object. | |
29 | */ | |
30 | void ubifs_set_inode_flags(struct inode *inode) | |
31 | { | |
32 | unsigned int flags = ubifs_inode(inode)->flags; | |
33 | ||
2ee6a576 EB |
34 | inode->i_flags &= ~(S_SYNC | S_APPEND | S_IMMUTABLE | S_DIRSYNC | |
35 | S_ENCRYPTED); | |
1e51764a AB |
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; | |
2ee6a576 EB |
44 | if (flags & UBIFS_CRYPT_FL) |
45 | inode->i_flags |= S_ENCRYPTED; | |
1e51764a AB |
46 | } |
47 | ||
48 | /* | |
49 | * ioctl2ubifs - convert ioctl inode flags to UBIFS inode flags. | |
50 | * @ioctl_flags: flags to convert | |
51 | * | |
798868c0 | 52 | * This function converts ioctl flags (@FS_COMPR_FL, etc) to UBIFS inode flags |
1e51764a AB |
53 | * (@UBIFS_COMPR_FL, etc). |
54 | */ | |
55 | static 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 | * ubifs2ioctl - convert UBIFS inode flags to ioctl inode flags. | |
75 | * @ubifs_flags: flags to convert | |
76 | * | |
798868c0 RL |
77 | * This function converts UBIFS inode flags (@UBIFS_COMPR_FL, etc) to ioctl |
78 | * flags (@FS_COMPR_FL, etc). | |
1e51764a AB |
79 | */ |
80 | static 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 | ||
98 | static 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 | /* | |
111 | * The IMMUTABLE and APPEND_ONLY flags can only be changed by | |
112 | * the relevant capability. | |
113 | */ | |
114 | mutex_lock(&ui->ui_mutex); | |
115 | oldflags = ubifs2ioctl(ui->flags); | |
116 | if ((flags ^ oldflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL)) { | |
117 | if (!capable(CAP_LINUX_IMMUTABLE)) { | |
118 | err = -EPERM; | |
119 | goto out_unlock; | |
120 | } | |
121 | } | |
122 | ||
123 | ui->flags = ioctl2ubifs(flags); | |
124 | ubifs_set_inode_flags(inode); | |
607a11ad | 125 | inode->i_ctime = current_time(inode); |
1e51764a AB |
126 | release = ui->dirty; |
127 | mark_inode_dirty_sync(inode); | |
128 | mutex_unlock(&ui->ui_mutex); | |
129 | ||
130 | if (release) | |
131 | ubifs_release_budget(c, &req); | |
132 | if (IS_SYNC(inode)) | |
133 | err = write_inode_now(inode, 1); | |
134 | return err; | |
135 | ||
136 | out_unlock: | |
235c362b | 137 | ubifs_err(c, "can't modify inode %lu attributes", inode->i_ino); |
1e51764a AB |
138 | mutex_unlock(&ui->ui_mutex); |
139 | ubifs_release_budget(c, &req); | |
140 | return err; | |
141 | } | |
142 | ||
143 | long ubifs_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
144 | { | |
145 | int flags, err; | |
496ad9aa | 146 | struct inode *inode = file_inode(file); |
1e51764a AB |
147 | |
148 | switch (cmd) { | |
149 | case FS_IOC_GETFLAGS: | |
150 | flags = ubifs2ioctl(ubifs_inode(inode)->flags); | |
151 | ||
a9f2fc0e | 152 | dbg_gen("get flags: %#x, i_flags %#x", flags, inode->i_flags); |
1e51764a AB |
153 | return put_user(flags, (int __user *) arg); |
154 | ||
155 | case FS_IOC_SETFLAGS: { | |
156 | if (IS_RDONLY(inode)) | |
157 | return -EROFS; | |
158 | ||
2e149670 | 159 | if (!inode_owner_or_capable(inode)) |
1e51764a AB |
160 | return -EACCES; |
161 | ||
162 | if (get_user(flags, (int __user *) arg)) | |
163 | return -EFAULT; | |
164 | ||
2fe8b2d5 HT |
165 | if (flags & ~UBIFS_SUPPORTED_IOCTL_FLAGS) |
166 | return -EOPNOTSUPP; | |
167 | ||
1e51764a AB |
168 | if (!S_ISDIR(inode->i_mode)) |
169 | flags &= ~FS_DIRSYNC_FL; | |
170 | ||
171 | /* | |
172 | * Make sure the file-system is read-write and make sure it | |
173 | * will not become read-only while we are changing the flags. | |
174 | */ | |
a561be71 | 175 | err = mnt_want_write_file(file); |
1e51764a AB |
176 | if (err) |
177 | return err; | |
a9f2fc0e | 178 | dbg_gen("set flags: %#x, i_flags %#x", flags, inode->i_flags); |
1e51764a | 179 | err = setflags(inode, flags); |
2a79f17e | 180 | mnt_drop_write_file(file); |
1e51764a AB |
181 | return err; |
182 | } | |
d475a507 | 183 | case FS_IOC_SET_ENCRYPTION_POLICY: { |
e021986e | 184 | struct ubifs_info *c = inode->i_sb->s_fs_info; |
d475a507 | 185 | |
e021986e RW |
186 | err = ubifs_enable_encryption(c); |
187 | if (err) | |
188 | return err; | |
189 | ||
ec9160da | 190 | return fscrypt_ioctl_set_policy(file, (const void __user *)arg); |
d475a507 | 191 | } |
cf394967 | 192 | case FS_IOC_GET_ENCRYPTION_POLICY: |
ec9160da | 193 | return fscrypt_ioctl_get_policy(file, (void __user *)arg); |
1e51764a AB |
194 | |
195 | default: | |
196 | return -ENOTTY; | |
197 | } | |
198 | } | |
199 | ||
200 | #ifdef CONFIG_COMPAT | |
201 | long ubifs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
202 | { | |
203 | switch (cmd) { | |
204 | case FS_IOC32_GETFLAGS: | |
205 | cmd = FS_IOC_GETFLAGS; | |
206 | break; | |
207 | case FS_IOC32_SETFLAGS: | |
208 | cmd = FS_IOC_SETFLAGS; | |
209 | break; | |
a75467d9 EB |
210 | case FS_IOC_SET_ENCRYPTION_POLICY: |
211 | case FS_IOC_GET_ENCRYPTION_POLICY: | |
212 | break; | |
1e51764a AB |
213 | default: |
214 | return -ENOIOCTLCMD; | |
215 | } | |
216 | return ubifs_ioctl(file, cmd, (unsigned long)compat_ptr(arg)); | |
217 | } | |
218 | #endif |