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Commit | Line | Data |
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ac27a0ec | 1 | /* |
617ba13b | 2 | * linux/fs/ext4/ioctl.c |
ac27a0ec DK |
3 | * |
4 | * Copyright (C) 1993, 1994, 1995 | |
5 | * Remy Card (card@masi.ibp.fr) | |
6 | * Laboratoire MASI - Institut Blaise Pascal | |
7 | * Universite Pierre et Marie Curie (Paris VI) | |
8 | */ | |
9 | ||
10 | #include <linux/fs.h> | |
dab291af | 11 | #include <linux/jbd2.h> |
ac27a0ec | 12 | #include <linux/capability.h> |
617ba13b | 13 | #include <linux/ext4_fs.h> |
dab291af | 14 | #include <linux/ext4_jbd2.h> |
ac27a0ec DK |
15 | #include <linux/time.h> |
16 | #include <linux/compat.h> | |
17 | #include <linux/smp_lock.h> | |
18 | #include <asm/uaccess.h> | |
19 | ||
617ba13b | 20 | int ext4_ioctl (struct inode * inode, struct file * filp, unsigned int cmd, |
ac27a0ec DK |
21 | unsigned long arg) |
22 | { | |
617ba13b | 23 | struct ext4_inode_info *ei = EXT4_I(inode); |
ac27a0ec DK |
24 | unsigned int flags; |
25 | unsigned short rsv_window_size; | |
26 | ||
617ba13b | 27 | ext4_debug ("cmd = %u, arg = %lu\n", cmd, arg); |
ac27a0ec DK |
28 | |
29 | switch (cmd) { | |
617ba13b MC |
30 | case EXT4_IOC_GETFLAGS: |
31 | flags = ei->i_flags & EXT4_FL_USER_VISIBLE; | |
ac27a0ec | 32 | return put_user(flags, (int __user *) arg); |
617ba13b | 33 | case EXT4_IOC_SETFLAGS: { |
ac27a0ec DK |
34 | handle_t *handle = NULL; |
35 | int err; | |
617ba13b | 36 | struct ext4_iloc iloc; |
ac27a0ec DK |
37 | unsigned int oldflags; |
38 | unsigned int jflag; | |
39 | ||
40 | if (IS_RDONLY(inode)) | |
41 | return -EROFS; | |
42 | ||
43 | if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER)) | |
44 | return -EACCES; | |
45 | ||
46 | if (get_user(flags, (int __user *) arg)) | |
47 | return -EFAULT; | |
48 | ||
49 | if (!S_ISDIR(inode->i_mode)) | |
617ba13b | 50 | flags &= ~EXT4_DIRSYNC_FL; |
ac27a0ec DK |
51 | |
52 | mutex_lock(&inode->i_mutex); | |
53 | oldflags = ei->i_flags; | |
54 | ||
55 | /* The JOURNAL_DATA flag is modifiable only by root */ | |
617ba13b | 56 | jflag = flags & EXT4_JOURNAL_DATA_FL; |
ac27a0ec DK |
57 | |
58 | /* | |
59 | * The IMMUTABLE and APPEND_ONLY flags can only be changed by | |
60 | * the relevant capability. | |
61 | * | |
62 | * This test looks nicer. Thanks to Pauline Middelink | |
63 | */ | |
617ba13b | 64 | if ((flags ^ oldflags) & (EXT4_APPEND_FL | EXT4_IMMUTABLE_FL)) { |
ac27a0ec DK |
65 | if (!capable(CAP_LINUX_IMMUTABLE)) { |
66 | mutex_unlock(&inode->i_mutex); | |
67 | return -EPERM; | |
68 | } | |
69 | } | |
70 | ||
71 | /* | |
72 | * The JOURNAL_DATA flag can only be changed by | |
73 | * the relevant capability. | |
74 | */ | |
617ba13b | 75 | if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL)) { |
ac27a0ec DK |
76 | if (!capable(CAP_SYS_RESOURCE)) { |
77 | mutex_unlock(&inode->i_mutex); | |
78 | return -EPERM; | |
79 | } | |
80 | } | |
81 | ||
82 | ||
617ba13b | 83 | handle = ext4_journal_start(inode, 1); |
ac27a0ec DK |
84 | if (IS_ERR(handle)) { |
85 | mutex_unlock(&inode->i_mutex); | |
86 | return PTR_ERR(handle); | |
87 | } | |
88 | if (IS_SYNC(inode)) | |
89 | handle->h_sync = 1; | |
617ba13b | 90 | err = ext4_reserve_inode_write(handle, inode, &iloc); |
ac27a0ec DK |
91 | if (err) |
92 | goto flags_err; | |
93 | ||
617ba13b MC |
94 | flags = flags & EXT4_FL_USER_MODIFIABLE; |
95 | flags |= oldflags & ~EXT4_FL_USER_MODIFIABLE; | |
ac27a0ec DK |
96 | ei->i_flags = flags; |
97 | ||
617ba13b | 98 | ext4_set_inode_flags(inode); |
ac27a0ec DK |
99 | inode->i_ctime = CURRENT_TIME_SEC; |
100 | ||
617ba13b | 101 | err = ext4_mark_iloc_dirty(handle, inode, &iloc); |
ac27a0ec | 102 | flags_err: |
617ba13b | 103 | ext4_journal_stop(handle); |
ac27a0ec DK |
104 | if (err) { |
105 | mutex_unlock(&inode->i_mutex); | |
106 | return err; | |
107 | } | |
108 | ||
617ba13b MC |
109 | if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL)) |
110 | err = ext4_change_inode_journal_flag(inode, jflag); | |
ac27a0ec DK |
111 | mutex_unlock(&inode->i_mutex); |
112 | return err; | |
113 | } | |
617ba13b MC |
114 | case EXT4_IOC_GETVERSION: |
115 | case EXT4_IOC_GETVERSION_OLD: | |
ac27a0ec | 116 | return put_user(inode->i_generation, (int __user *) arg); |
617ba13b MC |
117 | case EXT4_IOC_SETVERSION: |
118 | case EXT4_IOC_SETVERSION_OLD: { | |
ac27a0ec | 119 | handle_t *handle; |
617ba13b | 120 | struct ext4_iloc iloc; |
ac27a0ec DK |
121 | __u32 generation; |
122 | int err; | |
123 | ||
124 | if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER)) | |
125 | return -EPERM; | |
126 | if (IS_RDONLY(inode)) | |
127 | return -EROFS; | |
128 | if (get_user(generation, (int __user *) arg)) | |
129 | return -EFAULT; | |
130 | ||
617ba13b | 131 | handle = ext4_journal_start(inode, 1); |
ac27a0ec DK |
132 | if (IS_ERR(handle)) |
133 | return PTR_ERR(handle); | |
617ba13b | 134 | err = ext4_reserve_inode_write(handle, inode, &iloc); |
ac27a0ec DK |
135 | if (err == 0) { |
136 | inode->i_ctime = CURRENT_TIME_SEC; | |
137 | inode->i_generation = generation; | |
617ba13b | 138 | err = ext4_mark_iloc_dirty(handle, inode, &iloc); |
ac27a0ec | 139 | } |
617ba13b | 140 | ext4_journal_stop(handle); |
ac27a0ec DK |
141 | return err; |
142 | } | |
143 | #ifdef CONFIG_JBD_DEBUG | |
617ba13b | 144 | case EXT4_IOC_WAIT_FOR_READONLY: |
ac27a0ec DK |
145 | /* |
146 | * This is racy - by the time we're woken up and running, | |
147 | * the superblock could be released. And the module could | |
148 | * have been unloaded. So sue me. | |
149 | * | |
150 | * Returns 1 if it slept, else zero. | |
151 | */ | |
152 | { | |
153 | struct super_block *sb = inode->i_sb; | |
154 | DECLARE_WAITQUEUE(wait, current); | |
155 | int ret = 0; | |
156 | ||
157 | set_current_state(TASK_INTERRUPTIBLE); | |
617ba13b MC |
158 | add_wait_queue(&EXT4_SB(sb)->ro_wait_queue, &wait); |
159 | if (timer_pending(&EXT4_SB(sb)->turn_ro_timer)) { | |
ac27a0ec DK |
160 | schedule(); |
161 | ret = 1; | |
162 | } | |
617ba13b | 163 | remove_wait_queue(&EXT4_SB(sb)->ro_wait_queue, &wait); |
ac27a0ec DK |
164 | return ret; |
165 | } | |
166 | #endif | |
617ba13b | 167 | case EXT4_IOC_GETRSVSZ: |
ac27a0ec DK |
168 | if (test_opt(inode->i_sb, RESERVATION) |
169 | && S_ISREG(inode->i_mode) | |
170 | && ei->i_block_alloc_info) { | |
171 | rsv_window_size = ei->i_block_alloc_info->rsv_window_node.rsv_goal_size; | |
172 | return put_user(rsv_window_size, (int __user *)arg); | |
173 | } | |
174 | return -ENOTTY; | |
617ba13b | 175 | case EXT4_IOC_SETRSVSZ: { |
ac27a0ec DK |
176 | |
177 | if (!test_opt(inode->i_sb, RESERVATION) ||!S_ISREG(inode->i_mode)) | |
178 | return -ENOTTY; | |
179 | ||
180 | if (IS_RDONLY(inode)) | |
181 | return -EROFS; | |
182 | ||
183 | if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER)) | |
184 | return -EACCES; | |
185 | ||
186 | if (get_user(rsv_window_size, (int __user *)arg)) | |
187 | return -EFAULT; | |
188 | ||
617ba13b MC |
189 | if (rsv_window_size > EXT4_MAX_RESERVE_BLOCKS) |
190 | rsv_window_size = EXT4_MAX_RESERVE_BLOCKS; | |
ac27a0ec DK |
191 | |
192 | /* | |
193 | * need to allocate reservation structure for this inode | |
194 | * before set the window size | |
195 | */ | |
196 | mutex_lock(&ei->truncate_mutex); | |
197 | if (!ei->i_block_alloc_info) | |
617ba13b | 198 | ext4_init_block_alloc_info(inode); |
ac27a0ec DK |
199 | |
200 | if (ei->i_block_alloc_info){ | |
617ba13b | 201 | struct ext4_reserve_window_node *rsv = &ei->i_block_alloc_info->rsv_window_node; |
ac27a0ec DK |
202 | rsv->rsv_goal_size = rsv_window_size; |
203 | } | |
204 | mutex_unlock(&ei->truncate_mutex); | |
205 | return 0; | |
206 | } | |
617ba13b MC |
207 | case EXT4_IOC_GROUP_EXTEND: { |
208 | ext4_fsblk_t n_blocks_count; | |
ac27a0ec DK |
209 | struct super_block *sb = inode->i_sb; |
210 | int err; | |
211 | ||
212 | if (!capable(CAP_SYS_RESOURCE)) | |
213 | return -EPERM; | |
214 | ||
215 | if (IS_RDONLY(inode)) | |
216 | return -EROFS; | |
217 | ||
218 | if (get_user(n_blocks_count, (__u32 __user *)arg)) | |
219 | return -EFAULT; | |
220 | ||
617ba13b | 221 | err = ext4_group_extend(sb, EXT4_SB(sb)->s_es, n_blocks_count); |
dab291af MC |
222 | jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal); |
223 | jbd2_journal_flush(EXT4_SB(sb)->s_journal); | |
224 | jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal); | |
ac27a0ec DK |
225 | |
226 | return err; | |
227 | } | |
617ba13b MC |
228 | case EXT4_IOC_GROUP_ADD: { |
229 | struct ext4_new_group_data input; | |
ac27a0ec DK |
230 | struct super_block *sb = inode->i_sb; |
231 | int err; | |
232 | ||
233 | if (!capable(CAP_SYS_RESOURCE)) | |
234 | return -EPERM; | |
235 | ||
236 | if (IS_RDONLY(inode)) | |
237 | return -EROFS; | |
238 | ||
617ba13b | 239 | if (copy_from_user(&input, (struct ext4_new_group_input __user *)arg, |
ac27a0ec DK |
240 | sizeof(input))) |
241 | return -EFAULT; | |
242 | ||
617ba13b | 243 | err = ext4_group_add(sb, &input); |
dab291af MC |
244 | jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal); |
245 | jbd2_journal_flush(EXT4_SB(sb)->s_journal); | |
246 | jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal); | |
ac27a0ec DK |
247 | |
248 | return err; | |
249 | } | |
250 | ||
ac27a0ec DK |
251 | default: |
252 | return -ENOTTY; | |
253 | } | |
254 | } | |
255 | ||
256 | #ifdef CONFIG_COMPAT | |
617ba13b | 257 | long ext4_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
ac27a0ec | 258 | { |
9d549890 | 259 | struct inode *inode = file->f_path.dentry->d_inode; |
ac27a0ec DK |
260 | int ret; |
261 | ||
262 | /* These are just misnamed, they actually get/put from/to user an int */ | |
263 | switch (cmd) { | |
617ba13b MC |
264 | case EXT4_IOC32_GETFLAGS: |
265 | cmd = EXT4_IOC_GETFLAGS; | |
ac27a0ec | 266 | break; |
617ba13b MC |
267 | case EXT4_IOC32_SETFLAGS: |
268 | cmd = EXT4_IOC_SETFLAGS; | |
ac27a0ec | 269 | break; |
617ba13b MC |
270 | case EXT4_IOC32_GETVERSION: |
271 | cmd = EXT4_IOC_GETVERSION; | |
ac27a0ec | 272 | break; |
617ba13b MC |
273 | case EXT4_IOC32_SETVERSION: |
274 | cmd = EXT4_IOC_SETVERSION; | |
ac27a0ec | 275 | break; |
617ba13b MC |
276 | case EXT4_IOC32_GROUP_EXTEND: |
277 | cmd = EXT4_IOC_GROUP_EXTEND; | |
ac27a0ec | 278 | break; |
617ba13b MC |
279 | case EXT4_IOC32_GETVERSION_OLD: |
280 | cmd = EXT4_IOC_GETVERSION_OLD; | |
ac27a0ec | 281 | break; |
617ba13b MC |
282 | case EXT4_IOC32_SETVERSION_OLD: |
283 | cmd = EXT4_IOC_SETVERSION_OLD; | |
ac27a0ec DK |
284 | break; |
285 | #ifdef CONFIG_JBD_DEBUG | |
617ba13b MC |
286 | case EXT4_IOC32_WAIT_FOR_READONLY: |
287 | cmd = EXT4_IOC_WAIT_FOR_READONLY; | |
ac27a0ec DK |
288 | break; |
289 | #endif | |
617ba13b MC |
290 | case EXT4_IOC32_GETRSVSZ: |
291 | cmd = EXT4_IOC_GETRSVSZ; | |
ac27a0ec | 292 | break; |
617ba13b MC |
293 | case EXT4_IOC32_SETRSVSZ: |
294 | cmd = EXT4_IOC_SETRSVSZ; | |
ac27a0ec | 295 | break; |
617ba13b | 296 | case EXT4_IOC_GROUP_ADD: |
ac27a0ec DK |
297 | break; |
298 | default: | |
299 | return -ENOIOCTLCMD; | |
300 | } | |
301 | lock_kernel(); | |
617ba13b | 302 | ret = ext4_ioctl(inode, file, cmd, (unsigned long) compat_ptr(arg)); |
ac27a0ec DK |
303 | unlock_kernel(); |
304 | return ret; | |
305 | } | |
306 | #endif |