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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * linux/fs/ext3/ioctl.c | |
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> | |
11 | #include <linux/jbd.h> | |
16f7e0fe | 12 | #include <linux/capability.h> |
1da177e4 LT |
13 | #include <linux/ext3_fs.h> |
14 | #include <linux/ext3_jbd.h> | |
42a74f20 | 15 | #include <linux/mount.h> |
1da177e4 | 16 | #include <linux/time.h> |
52a700c5 | 17 | #include <linux/compat.h> |
1da177e4 LT |
18 | #include <asm/uaccess.h> |
19 | ||
039fd8ce | 20 | long ext3_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) |
1da177e4 | 21 | { |
039fd8ce | 22 | struct inode *inode = filp->f_dentry->d_inode; |
1da177e4 LT |
23 | struct ext3_inode_info *ei = EXT3_I(inode); |
24 | unsigned int flags; | |
25 | unsigned short rsv_window_size; | |
26 | ||
27 | ext3_debug ("cmd = %u, arg = %lu\n", cmd, arg); | |
28 | ||
29 | switch (cmd) { | |
30 | case EXT3_IOC_GETFLAGS: | |
28be5abb | 31 | ext3_get_inode_flags(ei); |
1da177e4 LT |
32 | flags = ei->i_flags & EXT3_FL_USER_VISIBLE; |
33 | return put_user(flags, (int __user *) arg); | |
34 | case EXT3_IOC_SETFLAGS: { | |
35 | handle_t *handle = NULL; | |
36 | int err; | |
37 | struct ext3_iloc iloc; | |
38 | unsigned int oldflags; | |
39 | unsigned int jflag; | |
40 | ||
2e149670 | 41 | if (!inode_owner_or_capable(inode)) |
039fd8ce CM |
42 | return -EACCES; |
43 | ||
44 | if (get_user(flags, (int __user *) arg)) | |
45 | return -EFAULT; | |
46 | ||
a561be71 | 47 | err = mnt_want_write_file(filp); |
42a74f20 DH |
48 | if (err) |
49 | return err; | |
1da177e4 | 50 | |
04143e2f | 51 | flags = ext3_mask_flags(inode->i_mode, flags); |
1da177e4 | 52 | |
a090d913 | 53 | mutex_lock(&inode->i_mutex); |
039fd8ce | 54 | |
e47776a0 | 55 | /* Is it quota file? Do not allow user to mess with it */ |
039fd8ce CM |
56 | err = -EPERM; |
57 | if (IS_NOQUOTA(inode)) | |
42a74f20 | 58 | goto flags_out; |
039fd8ce | 59 | |
1da177e4 LT |
60 | oldflags = ei->i_flags; |
61 | ||
62 | /* The JOURNAL_DATA flag is modifiable only by root */ | |
63 | jflag = flags & EXT3_JOURNAL_DATA_FL; | |
64 | ||
65 | /* | |
66 | * The IMMUTABLE and APPEND_ONLY flags can only be changed by | |
67 | * the relevant capability. | |
68 | * | |
69 | * This test looks nicer. Thanks to Pauline Middelink | |
70 | */ | |
71 | if ((flags ^ oldflags) & (EXT3_APPEND_FL | EXT3_IMMUTABLE_FL)) { | |
039fd8ce | 72 | if (!capable(CAP_LINUX_IMMUTABLE)) |
42a74f20 | 73 | goto flags_out; |
1da177e4 LT |
74 | } |
75 | ||
76 | /* | |
77 | * The JOURNAL_DATA flag can only be changed by | |
78 | * the relevant capability. | |
79 | */ | |
80 | if ((jflag ^ oldflags) & (EXT3_JOURNAL_DATA_FL)) { | |
039fd8ce | 81 | if (!capable(CAP_SYS_RESOURCE)) |
42a74f20 | 82 | goto flags_out; |
1da177e4 LT |
83 | } |
84 | ||
1da177e4 | 85 | handle = ext3_journal_start(inode, 1); |
a090d913 | 86 | if (IS_ERR(handle)) { |
42a74f20 DH |
87 | err = PTR_ERR(handle); |
88 | goto flags_out; | |
a090d913 | 89 | } |
1da177e4 LT |
90 | if (IS_SYNC(inode)) |
91 | handle->h_sync = 1; | |
92 | err = ext3_reserve_inode_write(handle, inode, &iloc); | |
93 | if (err) | |
94 | goto flags_err; | |
95 | ||
96 | flags = flags & EXT3_FL_USER_MODIFIABLE; | |
97 | flags |= oldflags & ~EXT3_FL_USER_MODIFIABLE; | |
98 | ei->i_flags = flags; | |
99 | ||
100 | ext3_set_inode_flags(inode); | |
101 | inode->i_ctime = CURRENT_TIME_SEC; | |
102 | ||
103 | err = ext3_mark_iloc_dirty(handle, inode, &iloc); | |
104 | flags_err: | |
105 | ext3_journal_stop(handle); | |
039fd8ce CM |
106 | if (err) |
107 | goto flags_out; | |
1da177e4 LT |
108 | |
109 | if ((jflag ^ oldflags) & (EXT3_JOURNAL_DATA_FL)) | |
110 | err = ext3_change_inode_journal_flag(inode, jflag); | |
42a74f20 | 111 | flags_out: |
039fd8ce | 112 | mutex_unlock(&inode->i_mutex); |
2a79f17e | 113 | mnt_drop_write_file(filp); |
1da177e4 LT |
114 | return err; |
115 | } | |
116 | case EXT3_IOC_GETVERSION: | |
117 | case EXT3_IOC_GETVERSION_OLD: | |
118 | return put_user(inode->i_generation, (int __user *) arg); | |
119 | case EXT3_IOC_SETVERSION: | |
120 | case EXT3_IOC_SETVERSION_OLD: { | |
121 | handle_t *handle; | |
122 | struct ext3_iloc iloc; | |
123 | __u32 generation; | |
124 | int err; | |
125 | ||
2e149670 | 126 | if (!inode_owner_or_capable(inode)) |
1da177e4 | 127 | return -EPERM; |
039fd8ce | 128 | |
a561be71 | 129 | err = mnt_want_write_file(filp); |
42a74f20 DH |
130 | if (err) |
131 | return err; | |
132 | if (get_user(generation, (int __user *) arg)) { | |
133 | err = -EFAULT; | |
134 | goto setversion_out; | |
135 | } | |
039fd8ce | 136 | |
6c2155b9 | 137 | mutex_lock(&inode->i_mutex); |
1da177e4 | 138 | handle = ext3_journal_start(inode, 1); |
42a74f20 DH |
139 | if (IS_ERR(handle)) { |
140 | err = PTR_ERR(handle); | |
6c2155b9 | 141 | goto unlock_out; |
42a74f20 | 142 | } |
1da177e4 LT |
143 | err = ext3_reserve_inode_write(handle, inode, &iloc); |
144 | if (err == 0) { | |
145 | inode->i_ctime = CURRENT_TIME_SEC; | |
146 | inode->i_generation = generation; | |
147 | err = ext3_mark_iloc_dirty(handle, inode, &iloc); | |
148 | } | |
149 | ext3_journal_stop(handle); | |
6c2155b9 DH |
150 | |
151 | unlock_out: | |
152 | mutex_unlock(&inode->i_mutex); | |
42a74f20 | 153 | setversion_out: |
2a79f17e | 154 | mnt_drop_write_file(filp); |
1da177e4 LT |
155 | return err; |
156 | } | |
1da177e4 LT |
157 | case EXT3_IOC_GETRSVSZ: |
158 | if (test_opt(inode->i_sb, RESERVATION) | |
159 | && S_ISREG(inode->i_mode) | |
160 | && ei->i_block_alloc_info) { | |
161 | rsv_window_size = ei->i_block_alloc_info->rsv_window_node.rsv_goal_size; | |
162 | return put_user(rsv_window_size, (int __user *)arg); | |
163 | } | |
164 | return -ENOTTY; | |
165 | case EXT3_IOC_SETRSVSZ: { | |
42a74f20 | 166 | int err; |
1da177e4 LT |
167 | |
168 | if (!test_opt(inode->i_sb, RESERVATION) ||!S_ISREG(inode->i_mode)) | |
169 | return -ENOTTY; | |
170 | ||
a561be71 | 171 | err = mnt_want_write_file(filp); |
42a74f20 DH |
172 | if (err) |
173 | return err; | |
1da177e4 | 174 | |
2e149670 | 175 | if (!inode_owner_or_capable(inode)) { |
42a74f20 DH |
176 | err = -EACCES; |
177 | goto setrsvsz_out; | |
178 | } | |
1da177e4 | 179 | |
42a74f20 DH |
180 | if (get_user(rsv_window_size, (int __user *)arg)) { |
181 | err = -EFAULT; | |
182 | goto setrsvsz_out; | |
183 | } | |
1da177e4 LT |
184 | |
185 | if (rsv_window_size > EXT3_MAX_RESERVE_BLOCKS) | |
186 | rsv_window_size = EXT3_MAX_RESERVE_BLOCKS; | |
187 | ||
188 | /* | |
189 | * need to allocate reservation structure for this inode | |
190 | * before set the window size | |
191 | */ | |
97461518 | 192 | mutex_lock(&ei->truncate_mutex); |
1da177e4 LT |
193 | if (!ei->i_block_alloc_info) |
194 | ext3_init_block_alloc_info(inode); | |
195 | ||
196 | if (ei->i_block_alloc_info){ | |
197 | struct ext3_reserve_window_node *rsv = &ei->i_block_alloc_info->rsv_window_node; | |
198 | rsv->rsv_goal_size = rsv_window_size; | |
199 | } | |
97461518 | 200 | mutex_unlock(&ei->truncate_mutex); |
42a74f20 | 201 | setrsvsz_out: |
2a79f17e | 202 | mnt_drop_write_file(filp); |
42a74f20 | 203 | return err; |
1da177e4 LT |
204 | } |
205 | case EXT3_IOC_GROUP_EXTEND: { | |
43d23f90 | 206 | ext3_fsblk_t n_blocks_count; |
1da177e4 | 207 | struct super_block *sb = inode->i_sb; |
2d7c820e | 208 | int err, err2; |
1da177e4 LT |
209 | |
210 | if (!capable(CAP_SYS_RESOURCE)) | |
211 | return -EPERM; | |
212 | ||
a561be71 | 213 | err = mnt_want_write_file(filp); |
42a74f20 DH |
214 | if (err) |
215 | return err; | |
1da177e4 | 216 | |
42a74f20 DH |
217 | if (get_user(n_blocks_count, (__u32 __user *)arg)) { |
218 | err = -EFAULT; | |
219 | goto group_extend_out; | |
220 | } | |
1da177e4 LT |
221 | err = ext3_group_extend(sb, EXT3_SB(sb)->s_es, n_blocks_count); |
222 | journal_lock_updates(EXT3_SB(sb)->s_journal); | |
2d7c820e | 223 | err2 = journal_flush(EXT3_SB(sb)->s_journal); |
1da177e4 | 224 | journal_unlock_updates(EXT3_SB(sb)->s_journal); |
2d7c820e HK |
225 | if (err == 0) |
226 | err = err2; | |
42a74f20 | 227 | group_extend_out: |
2a79f17e | 228 | mnt_drop_write_file(filp); |
1da177e4 LT |
229 | return err; |
230 | } | |
231 | case EXT3_IOC_GROUP_ADD: { | |
232 | struct ext3_new_group_data input; | |
233 | struct super_block *sb = inode->i_sb; | |
2d7c820e | 234 | int err, err2; |
1da177e4 LT |
235 | |
236 | if (!capable(CAP_SYS_RESOURCE)) | |
237 | return -EPERM; | |
238 | ||
a561be71 | 239 | err = mnt_want_write_file(filp); |
42a74f20 DH |
240 | if (err) |
241 | return err; | |
1da177e4 LT |
242 | |
243 | if (copy_from_user(&input, (struct ext3_new_group_input __user *)arg, | |
42a74f20 DH |
244 | sizeof(input))) { |
245 | err = -EFAULT; | |
246 | goto group_add_out; | |
247 | } | |
1da177e4 LT |
248 | |
249 | err = ext3_group_add(sb, &input); | |
250 | journal_lock_updates(EXT3_SB(sb)->s_journal); | |
2d7c820e | 251 | err2 = journal_flush(EXT3_SB(sb)->s_journal); |
1da177e4 | 252 | journal_unlock_updates(EXT3_SB(sb)->s_journal); |
2d7c820e HK |
253 | if (err == 0) |
254 | err = err2; | |
42a74f20 | 255 | group_add_out: |
2a79f17e | 256 | mnt_drop_write_file(filp); |
1da177e4 LT |
257 | return err; |
258 | } | |
9c527492 | 259 | case FITRIM: { |
1da177e4 | 260 | |
9c527492 LC |
261 | struct super_block *sb = inode->i_sb; |
262 | struct fstrim_range range; | |
263 | int ret = 0; | |
264 | ||
265 | if (!capable(CAP_SYS_ADMIN)) | |
266 | return -EPERM; | |
267 | ||
81fe8c62 | 268 | if (copy_from_user(&range, (struct fstrim_range __user *)arg, |
9c527492 LC |
269 | sizeof(range))) |
270 | return -EFAULT; | |
271 | ||
272 | ret = ext3_trim_fs(sb, &range); | |
273 | if (ret < 0) | |
274 | return ret; | |
275 | ||
81fe8c62 | 276 | if (copy_to_user((struct fstrim_range __user *)arg, &range, |
9c527492 LC |
277 | sizeof(range))) |
278 | return -EFAULT; | |
279 | ||
280 | return 0; | |
281 | } | |
1da177e4 LT |
282 | |
283 | default: | |
284 | return -ENOTTY; | |
285 | } | |
286 | } | |
52a700c5 DH |
287 | |
288 | #ifdef CONFIG_COMPAT | |
289 | long ext3_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
290 | { | |
52a700c5 DH |
291 | /* These are just misnamed, they actually get/put from/to user an int */ |
292 | switch (cmd) { | |
293 | case EXT3_IOC32_GETFLAGS: | |
294 | cmd = EXT3_IOC_GETFLAGS; | |
295 | break; | |
296 | case EXT3_IOC32_SETFLAGS: | |
297 | cmd = EXT3_IOC_SETFLAGS; | |
298 | break; | |
299 | case EXT3_IOC32_GETVERSION: | |
300 | cmd = EXT3_IOC_GETVERSION; | |
301 | break; | |
302 | case EXT3_IOC32_SETVERSION: | |
303 | cmd = EXT3_IOC_SETVERSION; | |
304 | break; | |
305 | case EXT3_IOC32_GROUP_EXTEND: | |
306 | cmd = EXT3_IOC_GROUP_EXTEND; | |
307 | break; | |
308 | case EXT3_IOC32_GETVERSION_OLD: | |
309 | cmd = EXT3_IOC_GETVERSION_OLD; | |
310 | break; | |
311 | case EXT3_IOC32_SETVERSION_OLD: | |
312 | cmd = EXT3_IOC_SETVERSION_OLD; | |
313 | break; | |
314 | #ifdef CONFIG_JBD_DEBUG | |
315 | case EXT3_IOC32_WAIT_FOR_READONLY: | |
316 | cmd = EXT3_IOC_WAIT_FOR_READONLY; | |
317 | break; | |
318 | #endif | |
319 | case EXT3_IOC32_GETRSVSZ: | |
320 | cmd = EXT3_IOC_GETRSVSZ; | |
321 | break; | |
322 | case EXT3_IOC32_SETRSVSZ: | |
323 | cmd = EXT3_IOC_SETRSVSZ; | |
324 | break; | |
325 | case EXT3_IOC_GROUP_ADD: | |
326 | break; | |
327 | default: | |
328 | return -ENOIOCTLCMD; | |
329 | } | |
039fd8ce | 330 | return ext3_ioctl(file, cmd, (unsigned long) compat_ptr(arg)); |
52a700c5 DH |
331 | } |
332 | #endif |