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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 | 30 | case EXT4_IOC_GETFLAGS: |
ff9ddf7e | 31 | ext4_get_inode_flags(ei); |
617ba13b | 32 | flags = ei->i_flags & EXT4_FL_USER_VISIBLE; |
ac27a0ec | 33 | return put_user(flags, (int __user *) arg); |
617ba13b | 34 | case EXT4_IOC_SETFLAGS: { |
ac27a0ec DK |
35 | handle_t *handle = NULL; |
36 | int err; | |
617ba13b | 37 | struct ext4_iloc iloc; |
ac27a0ec DK |
38 | unsigned int oldflags; |
39 | unsigned int jflag; | |
40 | ||
41 | if (IS_RDONLY(inode)) | |
42 | return -EROFS; | |
43 | ||
3bd858ab | 44 | if (!is_owner_or_cap(inode)) |
ac27a0ec DK |
45 | return -EACCES; |
46 | ||
47 | if (get_user(flags, (int __user *) arg)) | |
48 | return -EFAULT; | |
49 | ||
50 | if (!S_ISDIR(inode->i_mode)) | |
617ba13b | 51 | flags &= ~EXT4_DIRSYNC_FL; |
ac27a0ec DK |
52 | |
53 | mutex_lock(&inode->i_mutex); | |
e47776a0 JK |
54 | /* Is it quota file? Do not allow user to mess with it */ |
55 | if (IS_NOQUOTA(inode)) { | |
56 | mutex_unlock(&inode->i_mutex); | |
57 | return -EPERM; | |
58 | } | |
ac27a0ec DK |
59 | oldflags = ei->i_flags; |
60 | ||
61 | /* The JOURNAL_DATA flag is modifiable only by root */ | |
617ba13b | 62 | jflag = flags & EXT4_JOURNAL_DATA_FL; |
ac27a0ec DK |
63 | |
64 | /* | |
65 | * The IMMUTABLE and APPEND_ONLY flags can only be changed by | |
66 | * the relevant capability. | |
67 | * | |
68 | * This test looks nicer. Thanks to Pauline Middelink | |
69 | */ | |
617ba13b | 70 | if ((flags ^ oldflags) & (EXT4_APPEND_FL | EXT4_IMMUTABLE_FL)) { |
ac27a0ec DK |
71 | if (!capable(CAP_LINUX_IMMUTABLE)) { |
72 | mutex_unlock(&inode->i_mutex); | |
73 | return -EPERM; | |
74 | } | |
75 | } | |
76 | ||
77 | /* | |
78 | * The JOURNAL_DATA flag can only be changed by | |
79 | * the relevant capability. | |
80 | */ | |
617ba13b | 81 | if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL)) { |
ac27a0ec DK |
82 | if (!capable(CAP_SYS_RESOURCE)) { |
83 | mutex_unlock(&inode->i_mutex); | |
84 | return -EPERM; | |
85 | } | |
86 | } | |
87 | ||
88 | ||
617ba13b | 89 | handle = ext4_journal_start(inode, 1); |
ac27a0ec DK |
90 | if (IS_ERR(handle)) { |
91 | mutex_unlock(&inode->i_mutex); | |
92 | return PTR_ERR(handle); | |
93 | } | |
94 | if (IS_SYNC(inode)) | |
95 | handle->h_sync = 1; | |
617ba13b | 96 | err = ext4_reserve_inode_write(handle, inode, &iloc); |
ac27a0ec DK |
97 | if (err) |
98 | goto flags_err; | |
99 | ||
617ba13b MC |
100 | flags = flags & EXT4_FL_USER_MODIFIABLE; |
101 | flags |= oldflags & ~EXT4_FL_USER_MODIFIABLE; | |
ac27a0ec DK |
102 | ei->i_flags = flags; |
103 | ||
617ba13b | 104 | ext4_set_inode_flags(inode); |
ef7f3835 | 105 | inode->i_ctime = ext4_current_time(inode); |
ac27a0ec | 106 | |
617ba13b | 107 | err = ext4_mark_iloc_dirty(handle, inode, &iloc); |
ac27a0ec | 108 | flags_err: |
617ba13b | 109 | ext4_journal_stop(handle); |
ac27a0ec DK |
110 | if (err) { |
111 | mutex_unlock(&inode->i_mutex); | |
112 | return err; | |
113 | } | |
114 | ||
617ba13b MC |
115 | if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL)) |
116 | err = ext4_change_inode_journal_flag(inode, jflag); | |
ac27a0ec DK |
117 | mutex_unlock(&inode->i_mutex); |
118 | return err; | |
119 | } | |
617ba13b MC |
120 | case EXT4_IOC_GETVERSION: |
121 | case EXT4_IOC_GETVERSION_OLD: | |
ac27a0ec | 122 | return put_user(inode->i_generation, (int __user *) arg); |
617ba13b MC |
123 | case EXT4_IOC_SETVERSION: |
124 | case EXT4_IOC_SETVERSION_OLD: { | |
ac27a0ec | 125 | handle_t *handle; |
617ba13b | 126 | struct ext4_iloc iloc; |
ac27a0ec DK |
127 | __u32 generation; |
128 | int err; | |
129 | ||
3bd858ab | 130 | if (!is_owner_or_cap(inode)) |
ac27a0ec DK |
131 | return -EPERM; |
132 | if (IS_RDONLY(inode)) | |
133 | return -EROFS; | |
134 | if (get_user(generation, (int __user *) arg)) | |
135 | return -EFAULT; | |
136 | ||
617ba13b | 137 | handle = ext4_journal_start(inode, 1); |
ac27a0ec DK |
138 | if (IS_ERR(handle)) |
139 | return PTR_ERR(handle); | |
617ba13b | 140 | err = ext4_reserve_inode_write(handle, inode, &iloc); |
ac27a0ec | 141 | if (err == 0) { |
ef7f3835 | 142 | inode->i_ctime = ext4_current_time(inode); |
ac27a0ec | 143 | inode->i_generation = generation; |
617ba13b | 144 | err = ext4_mark_iloc_dirty(handle, inode, &iloc); |
ac27a0ec | 145 | } |
617ba13b | 146 | ext4_journal_stop(handle); |
ac27a0ec DK |
147 | return err; |
148 | } | |
e23291b9 | 149 | #ifdef CONFIG_JBD2_DEBUG |
617ba13b | 150 | case EXT4_IOC_WAIT_FOR_READONLY: |
ac27a0ec DK |
151 | /* |
152 | * This is racy - by the time we're woken up and running, | |
153 | * the superblock could be released. And the module could | |
154 | * have been unloaded. So sue me. | |
155 | * | |
156 | * Returns 1 if it slept, else zero. | |
157 | */ | |
158 | { | |
159 | struct super_block *sb = inode->i_sb; | |
160 | DECLARE_WAITQUEUE(wait, current); | |
161 | int ret = 0; | |
162 | ||
163 | set_current_state(TASK_INTERRUPTIBLE); | |
617ba13b MC |
164 | add_wait_queue(&EXT4_SB(sb)->ro_wait_queue, &wait); |
165 | if (timer_pending(&EXT4_SB(sb)->turn_ro_timer)) { | |
ac27a0ec DK |
166 | schedule(); |
167 | ret = 1; | |
168 | } | |
617ba13b | 169 | remove_wait_queue(&EXT4_SB(sb)->ro_wait_queue, &wait); |
ac27a0ec DK |
170 | return ret; |
171 | } | |
172 | #endif | |
617ba13b | 173 | case EXT4_IOC_GETRSVSZ: |
ac27a0ec DK |
174 | if (test_opt(inode->i_sb, RESERVATION) |
175 | && S_ISREG(inode->i_mode) | |
176 | && ei->i_block_alloc_info) { | |
177 | rsv_window_size = ei->i_block_alloc_info->rsv_window_node.rsv_goal_size; | |
178 | return put_user(rsv_window_size, (int __user *)arg); | |
179 | } | |
180 | return -ENOTTY; | |
617ba13b | 181 | case EXT4_IOC_SETRSVSZ: { |
ac27a0ec DK |
182 | |
183 | if (!test_opt(inode->i_sb, RESERVATION) ||!S_ISREG(inode->i_mode)) | |
184 | return -ENOTTY; | |
185 | ||
186 | if (IS_RDONLY(inode)) | |
187 | return -EROFS; | |
188 | ||
3bd858ab | 189 | if (!is_owner_or_cap(inode)) |
ac27a0ec DK |
190 | return -EACCES; |
191 | ||
192 | if (get_user(rsv_window_size, (int __user *)arg)) | |
193 | return -EFAULT; | |
194 | ||
617ba13b MC |
195 | if (rsv_window_size > EXT4_MAX_RESERVE_BLOCKS) |
196 | rsv_window_size = EXT4_MAX_RESERVE_BLOCKS; | |
ac27a0ec DK |
197 | |
198 | /* | |
199 | * need to allocate reservation structure for this inode | |
200 | * before set the window size | |
201 | */ | |
0e855ac8 | 202 | down_write(&ei->i_data_sem); |
ac27a0ec | 203 | if (!ei->i_block_alloc_info) |
617ba13b | 204 | ext4_init_block_alloc_info(inode); |
ac27a0ec DK |
205 | |
206 | if (ei->i_block_alloc_info){ | |
617ba13b | 207 | struct ext4_reserve_window_node *rsv = &ei->i_block_alloc_info->rsv_window_node; |
ac27a0ec DK |
208 | rsv->rsv_goal_size = rsv_window_size; |
209 | } | |
0e855ac8 | 210 | up_write(&ei->i_data_sem); |
ac27a0ec DK |
211 | return 0; |
212 | } | |
617ba13b MC |
213 | case EXT4_IOC_GROUP_EXTEND: { |
214 | ext4_fsblk_t n_blocks_count; | |
ac27a0ec DK |
215 | struct super_block *sb = inode->i_sb; |
216 | int err; | |
217 | ||
218 | if (!capable(CAP_SYS_RESOURCE)) | |
219 | return -EPERM; | |
220 | ||
221 | if (IS_RDONLY(inode)) | |
222 | return -EROFS; | |
223 | ||
224 | if (get_user(n_blocks_count, (__u32 __user *)arg)) | |
225 | return -EFAULT; | |
226 | ||
617ba13b | 227 | err = ext4_group_extend(sb, EXT4_SB(sb)->s_es, n_blocks_count); |
dab291af MC |
228 | jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal); |
229 | jbd2_journal_flush(EXT4_SB(sb)->s_journal); | |
230 | jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal); | |
ac27a0ec DK |
231 | |
232 | return err; | |
233 | } | |
617ba13b MC |
234 | case EXT4_IOC_GROUP_ADD: { |
235 | struct ext4_new_group_data input; | |
ac27a0ec DK |
236 | struct super_block *sb = inode->i_sb; |
237 | int err; | |
238 | ||
239 | if (!capable(CAP_SYS_RESOURCE)) | |
240 | return -EPERM; | |
241 | ||
242 | if (IS_RDONLY(inode)) | |
243 | return -EROFS; | |
244 | ||
617ba13b | 245 | if (copy_from_user(&input, (struct ext4_new_group_input __user *)arg, |
ac27a0ec DK |
246 | sizeof(input))) |
247 | return -EFAULT; | |
248 | ||
617ba13b | 249 | err = ext4_group_add(sb, &input); |
dab291af MC |
250 | jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal); |
251 | jbd2_journal_flush(EXT4_SB(sb)->s_journal); | |
252 | jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal); | |
ac27a0ec DK |
253 | |
254 | return err; | |
255 | } | |
256 | ||
c14c6fd5 AK |
257 | case EXT4_IOC_MIGRATE: |
258 | return ext4_ext_migrate(inode, filp, cmd, arg); | |
259 | ||
ac27a0ec DK |
260 | default: |
261 | return -ENOTTY; | |
262 | } | |
263 | } | |
264 | ||
265 | #ifdef CONFIG_COMPAT | |
617ba13b | 266 | long ext4_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
ac27a0ec | 267 | { |
9d549890 | 268 | struct inode *inode = file->f_path.dentry->d_inode; |
ac27a0ec DK |
269 | int ret; |
270 | ||
271 | /* These are just misnamed, they actually get/put from/to user an int */ | |
272 | switch (cmd) { | |
617ba13b MC |
273 | case EXT4_IOC32_GETFLAGS: |
274 | cmd = EXT4_IOC_GETFLAGS; | |
ac27a0ec | 275 | break; |
617ba13b MC |
276 | case EXT4_IOC32_SETFLAGS: |
277 | cmd = EXT4_IOC_SETFLAGS; | |
ac27a0ec | 278 | break; |
617ba13b MC |
279 | case EXT4_IOC32_GETVERSION: |
280 | cmd = EXT4_IOC_GETVERSION; | |
ac27a0ec | 281 | break; |
617ba13b MC |
282 | case EXT4_IOC32_SETVERSION: |
283 | cmd = EXT4_IOC_SETVERSION; | |
ac27a0ec | 284 | break; |
617ba13b MC |
285 | case EXT4_IOC32_GROUP_EXTEND: |
286 | cmd = EXT4_IOC_GROUP_EXTEND; | |
ac27a0ec | 287 | break; |
617ba13b MC |
288 | case EXT4_IOC32_GETVERSION_OLD: |
289 | cmd = EXT4_IOC_GETVERSION_OLD; | |
ac27a0ec | 290 | break; |
617ba13b MC |
291 | case EXT4_IOC32_SETVERSION_OLD: |
292 | cmd = EXT4_IOC_SETVERSION_OLD; | |
ac27a0ec | 293 | break; |
e23291b9 | 294 | #ifdef CONFIG_JBD2_DEBUG |
617ba13b MC |
295 | case EXT4_IOC32_WAIT_FOR_READONLY: |
296 | cmd = EXT4_IOC_WAIT_FOR_READONLY; | |
ac27a0ec DK |
297 | break; |
298 | #endif | |
617ba13b MC |
299 | case EXT4_IOC32_GETRSVSZ: |
300 | cmd = EXT4_IOC_GETRSVSZ; | |
ac27a0ec | 301 | break; |
617ba13b MC |
302 | case EXT4_IOC32_SETRSVSZ: |
303 | cmd = EXT4_IOC_SETRSVSZ; | |
ac27a0ec | 304 | break; |
617ba13b | 305 | case EXT4_IOC_GROUP_ADD: |
ac27a0ec DK |
306 | break; |
307 | default: | |
308 | return -ENOIOCTLCMD; | |
309 | } | |
310 | lock_kernel(); | |
617ba13b | 311 | ret = ext4_ioctl(inode, file, cmd, (unsigned long) compat_ptr(arg)); |
ac27a0ec DK |
312 | unlock_kernel(); |
313 | return ret; | |
314 | } | |
315 | #endif |