Commit | Line | Data |
---|---|---|
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> |
ac27a0ec DK |
13 | #include <linux/time.h> |
14 | #include <linux/compat.h> | |
15 | #include <linux/smp_lock.h> | |
42a74f20 | 16 | #include <linux/mount.h> |
748de673 | 17 | #include <linux/file.h> |
ac27a0ec | 18 | #include <asm/uaccess.h> |
3dcf5451 CH |
19 | #include "ext4_jbd2.h" |
20 | #include "ext4.h" | |
ac27a0ec | 21 | |
5cdd7b2d | 22 | long ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) |
ac27a0ec | 23 | { |
5cdd7b2d | 24 | struct inode *inode = filp->f_dentry->d_inode; |
617ba13b | 25 | struct ext4_inode_info *ei = EXT4_I(inode); |
ac27a0ec | 26 | unsigned int flags; |
ac27a0ec | 27 | |
af5bc92d | 28 | ext4_debug("cmd = %u, arg = %lu\n", cmd, arg); |
ac27a0ec DK |
29 | |
30 | switch (cmd) { | |
617ba13b | 31 | case EXT4_IOC_GETFLAGS: |
ff9ddf7e | 32 | ext4_get_inode_flags(ei); |
617ba13b | 33 | flags = ei->i_flags & EXT4_FL_USER_VISIBLE; |
ac27a0ec | 34 | return put_user(flags, (int __user *) arg); |
617ba13b | 35 | case EXT4_IOC_SETFLAGS: { |
ac27a0ec | 36 | handle_t *handle = NULL; |
4db46fc2 | 37 | int err, migrate = 0; |
617ba13b | 38 | struct ext4_iloc iloc; |
ac27a0ec DK |
39 | unsigned int oldflags; |
40 | unsigned int jflag; | |
41 | ||
3bd858ab | 42 | if (!is_owner_or_cap(inode)) |
ac27a0ec DK |
43 | return -EACCES; |
44 | ||
45 | if (get_user(flags, (int __user *) arg)) | |
46 | return -EFAULT; | |
47 | ||
42a74f20 DH |
48 | err = mnt_want_write(filp->f_path.mnt); |
49 | if (err) | |
50 | return err; | |
51 | ||
2dc6b0d4 | 52 | flags = ext4_mask_flags(inode->i_mode, flags); |
ac27a0ec | 53 | |
42a74f20 | 54 | err = -EPERM; |
ac27a0ec | 55 | mutex_lock(&inode->i_mutex); |
e47776a0 | 56 | /* Is it quota file? Do not allow user to mess with it */ |
42a74f20 DH |
57 | if (IS_NOQUOTA(inode)) |
58 | goto flags_out; | |
59 | ||
ac27a0ec DK |
60 | oldflags = ei->i_flags; |
61 | ||
62 | /* The JOURNAL_DATA flag is modifiable only by root */ | |
617ba13b | 63 | jflag = flags & EXT4_JOURNAL_DATA_FL; |
ac27a0ec DK |
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 | */ | |
617ba13b | 71 | if ((flags ^ oldflags) & (EXT4_APPEND_FL | EXT4_IMMUTABLE_FL)) { |
42a74f20 DH |
72 | if (!capable(CAP_LINUX_IMMUTABLE)) |
73 | goto flags_out; | |
ac27a0ec DK |
74 | } |
75 | ||
76 | /* | |
77 | * The JOURNAL_DATA flag can only be changed by | |
78 | * the relevant capability. | |
79 | */ | |
617ba13b | 80 | if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL)) { |
42a74f20 DH |
81 | if (!capable(CAP_SYS_RESOURCE)) |
82 | goto flags_out; | |
ac27a0ec | 83 | } |
4db46fc2 AK |
84 | if (oldflags & EXT4_EXTENTS_FL) { |
85 | /* We don't support clearning extent flags */ | |
86 | if (!(flags & EXT4_EXTENTS_FL)) { | |
87 | err = -EOPNOTSUPP; | |
88 | goto flags_out; | |
89 | } | |
90 | } else if (flags & EXT4_EXTENTS_FL) { | |
91 | /* migrate the file */ | |
92 | migrate = 1; | |
93 | flags &= ~EXT4_EXTENTS_FL; | |
94 | } | |
ac27a0ec | 95 | |
617ba13b | 96 | handle = ext4_journal_start(inode, 1); |
ac27a0ec | 97 | if (IS_ERR(handle)) { |
42a74f20 DH |
98 | err = PTR_ERR(handle); |
99 | goto flags_out; | |
ac27a0ec DK |
100 | } |
101 | if (IS_SYNC(inode)) | |
0390131b | 102 | ext4_handle_sync(handle); |
617ba13b | 103 | err = ext4_reserve_inode_write(handle, inode, &iloc); |
ac27a0ec DK |
104 | if (err) |
105 | goto flags_err; | |
106 | ||
617ba13b MC |
107 | flags = flags & EXT4_FL_USER_MODIFIABLE; |
108 | flags |= oldflags & ~EXT4_FL_USER_MODIFIABLE; | |
ac27a0ec DK |
109 | ei->i_flags = flags; |
110 | ||
617ba13b | 111 | ext4_set_inode_flags(inode); |
ef7f3835 | 112 | inode->i_ctime = ext4_current_time(inode); |
ac27a0ec | 113 | |
617ba13b | 114 | err = ext4_mark_iloc_dirty(handle, inode, &iloc); |
ac27a0ec | 115 | flags_err: |
617ba13b | 116 | ext4_journal_stop(handle); |
42a74f20 DH |
117 | if (err) |
118 | goto flags_out; | |
ac27a0ec | 119 | |
617ba13b MC |
120 | if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL)) |
121 | err = ext4_change_inode_journal_flag(inode, jflag); | |
4db46fc2 AK |
122 | if (err) |
123 | goto flags_out; | |
124 | if (migrate) | |
125 | err = ext4_ext_migrate(inode); | |
42a74f20 | 126 | flags_out: |
ac27a0ec | 127 | mutex_unlock(&inode->i_mutex); |
42a74f20 | 128 | mnt_drop_write(filp->f_path.mnt); |
ac27a0ec DK |
129 | return err; |
130 | } | |
617ba13b MC |
131 | case EXT4_IOC_GETVERSION: |
132 | case EXT4_IOC_GETVERSION_OLD: | |
ac27a0ec | 133 | return put_user(inode->i_generation, (int __user *) arg); |
617ba13b MC |
134 | case EXT4_IOC_SETVERSION: |
135 | case EXT4_IOC_SETVERSION_OLD: { | |
ac27a0ec | 136 | handle_t *handle; |
617ba13b | 137 | struct ext4_iloc iloc; |
ac27a0ec DK |
138 | __u32 generation; |
139 | int err; | |
140 | ||
3bd858ab | 141 | if (!is_owner_or_cap(inode)) |
ac27a0ec | 142 | return -EPERM; |
42a74f20 DH |
143 | |
144 | err = mnt_want_write(filp->f_path.mnt); | |
145 | if (err) | |
146 | return err; | |
147 | if (get_user(generation, (int __user *) arg)) { | |
148 | err = -EFAULT; | |
149 | goto setversion_out; | |
150 | } | |
ac27a0ec | 151 | |
617ba13b | 152 | handle = ext4_journal_start(inode, 1); |
42a74f20 DH |
153 | if (IS_ERR(handle)) { |
154 | err = PTR_ERR(handle); | |
155 | goto setversion_out; | |
156 | } | |
617ba13b | 157 | err = ext4_reserve_inode_write(handle, inode, &iloc); |
ac27a0ec | 158 | if (err == 0) { |
ef7f3835 | 159 | inode->i_ctime = ext4_current_time(inode); |
ac27a0ec | 160 | inode->i_generation = generation; |
617ba13b | 161 | err = ext4_mark_iloc_dirty(handle, inode, &iloc); |
ac27a0ec | 162 | } |
617ba13b | 163 | ext4_journal_stop(handle); |
42a74f20 DH |
164 | setversion_out: |
165 | mnt_drop_write(filp->f_path.mnt); | |
ac27a0ec DK |
166 | return err; |
167 | } | |
e23291b9 | 168 | #ifdef CONFIG_JBD2_DEBUG |
617ba13b | 169 | case EXT4_IOC_WAIT_FOR_READONLY: |
ac27a0ec DK |
170 | /* |
171 | * This is racy - by the time we're woken up and running, | |
172 | * the superblock could be released. And the module could | |
173 | * have been unloaded. So sue me. | |
174 | * | |
175 | * Returns 1 if it slept, else zero. | |
176 | */ | |
177 | { | |
178 | struct super_block *sb = inode->i_sb; | |
179 | DECLARE_WAITQUEUE(wait, current); | |
180 | int ret = 0; | |
181 | ||
182 | set_current_state(TASK_INTERRUPTIBLE); | |
617ba13b MC |
183 | add_wait_queue(&EXT4_SB(sb)->ro_wait_queue, &wait); |
184 | if (timer_pending(&EXT4_SB(sb)->turn_ro_timer)) { | |
ac27a0ec DK |
185 | schedule(); |
186 | ret = 1; | |
187 | } | |
617ba13b | 188 | remove_wait_queue(&EXT4_SB(sb)->ro_wait_queue, &wait); |
ac27a0ec DK |
189 | return ret; |
190 | } | |
191 | #endif | |
617ba13b MC |
192 | case EXT4_IOC_GROUP_EXTEND: { |
193 | ext4_fsblk_t n_blocks_count; | |
ac27a0ec | 194 | struct super_block *sb = inode->i_sb; |
7ffe1ea8 | 195 | int err, err2; |
ac27a0ec DK |
196 | |
197 | if (!capable(CAP_SYS_RESOURCE)) | |
198 | return -EPERM; | |
199 | ||
ac27a0ec DK |
200 | if (get_user(n_blocks_count, (__u32 __user *)arg)) |
201 | return -EFAULT; | |
202 | ||
42a74f20 DH |
203 | err = mnt_want_write(filp->f_path.mnt); |
204 | if (err) | |
205 | return err; | |
206 | ||
617ba13b | 207 | err = ext4_group_extend(sb, EXT4_SB(sb)->s_es, n_blocks_count); |
dab291af | 208 | jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal); |
7ffe1ea8 | 209 | err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal); |
dab291af | 210 | jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal); |
7ffe1ea8 HK |
211 | if (err == 0) |
212 | err = err2; | |
42a74f20 | 213 | mnt_drop_write(filp->f_path.mnt); |
ac27a0ec DK |
214 | |
215 | return err; | |
216 | } | |
748de673 AF |
217 | |
218 | case EXT4_IOC_MOVE_EXT: { | |
219 | struct move_extent me; | |
220 | struct file *donor_filp; | |
221 | int err; | |
222 | ||
223 | if (copy_from_user(&me, | |
224 | (struct move_extent __user *)arg, sizeof(me))) | |
225 | return -EFAULT; | |
226 | ||
227 | donor_filp = fget(me.donor_fd); | |
228 | if (!donor_filp) | |
229 | return -EBADF; | |
230 | ||
231 | if (!capable(CAP_DAC_OVERRIDE)) { | |
232 | if ((current->real_cred->fsuid != inode->i_uid) || | |
233 | !(inode->i_mode & S_IRUSR) || | |
234 | !(donor_filp->f_dentry->d_inode->i_mode & | |
235 | S_IRUSR)) { | |
236 | fput(donor_filp); | |
237 | return -EACCES; | |
238 | } | |
239 | } | |
240 | ||
241 | err = ext4_move_extents(filp, donor_filp, me.orig_start, | |
242 | me.donor_start, me.len, &me.moved_len); | |
243 | fput(donor_filp); | |
244 | ||
245 | if (!err) | |
246 | if (copy_to_user((struct move_extent *)arg, | |
247 | &me, sizeof(me))) | |
248 | return -EFAULT; | |
249 | return err; | |
250 | } | |
251 | ||
617ba13b MC |
252 | case EXT4_IOC_GROUP_ADD: { |
253 | struct ext4_new_group_data input; | |
ac27a0ec | 254 | struct super_block *sb = inode->i_sb; |
7ffe1ea8 | 255 | int err, err2; |
ac27a0ec DK |
256 | |
257 | if (!capable(CAP_SYS_RESOURCE)) | |
258 | return -EPERM; | |
259 | ||
617ba13b | 260 | if (copy_from_user(&input, (struct ext4_new_group_input __user *)arg, |
ac27a0ec DK |
261 | sizeof(input))) |
262 | return -EFAULT; | |
263 | ||
42a74f20 DH |
264 | err = mnt_want_write(filp->f_path.mnt); |
265 | if (err) | |
266 | return err; | |
267 | ||
617ba13b | 268 | err = ext4_group_add(sb, &input); |
dab291af | 269 | jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal); |
7ffe1ea8 | 270 | err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal); |
dab291af | 271 | jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal); |
7ffe1ea8 HK |
272 | if (err == 0) |
273 | err = err2; | |
42a74f20 | 274 | mnt_drop_write(filp->f_path.mnt); |
ac27a0ec DK |
275 | |
276 | return err; | |
277 | } | |
278 | ||
c14c6fd5 | 279 | case EXT4_IOC_MIGRATE: |
2a43a878 AK |
280 | { |
281 | int err; | |
282 | if (!is_owner_or_cap(inode)) | |
283 | return -EACCES; | |
284 | ||
285 | err = mnt_want_write(filp->f_path.mnt); | |
286 | if (err) | |
287 | return err; | |
288 | /* | |
289 | * inode_mutex prevent write and truncate on the file. | |
290 | * Read still goes through. We take i_data_sem in | |
291 | * ext4_ext_swap_inode_data before we switch the | |
292 | * inode format to prevent read. | |
293 | */ | |
294 | mutex_lock(&(inode->i_mutex)); | |
295 | err = ext4_ext_migrate(inode); | |
296 | mutex_unlock(&(inode->i_mutex)); | |
297 | mnt_drop_write(filp->f_path.mnt); | |
298 | return err; | |
299 | } | |
c14c6fd5 | 300 | |
ccd2506b TT |
301 | case EXT4_IOC_ALLOC_DA_BLKS: |
302 | { | |
303 | int err; | |
304 | if (!is_owner_or_cap(inode)) | |
305 | return -EACCES; | |
306 | ||
307 | err = mnt_want_write(filp->f_path.mnt); | |
308 | if (err) | |
309 | return err; | |
310 | err = ext4_alloc_da_blocks(inode); | |
311 | mnt_drop_write(filp->f_path.mnt); | |
312 | return err; | |
313 | } | |
314 | ||
ac27a0ec DK |
315 | default: |
316 | return -ENOTTY; | |
317 | } | |
318 | } | |
319 | ||
320 | #ifdef CONFIG_COMPAT | |
617ba13b | 321 | long ext4_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
ac27a0ec | 322 | { |
ac27a0ec DK |
323 | /* These are just misnamed, they actually get/put from/to user an int */ |
324 | switch (cmd) { | |
617ba13b MC |
325 | case EXT4_IOC32_GETFLAGS: |
326 | cmd = EXT4_IOC_GETFLAGS; | |
ac27a0ec | 327 | break; |
617ba13b MC |
328 | case EXT4_IOC32_SETFLAGS: |
329 | cmd = EXT4_IOC_SETFLAGS; | |
ac27a0ec | 330 | break; |
617ba13b MC |
331 | case EXT4_IOC32_GETVERSION: |
332 | cmd = EXT4_IOC_GETVERSION; | |
ac27a0ec | 333 | break; |
617ba13b MC |
334 | case EXT4_IOC32_SETVERSION: |
335 | cmd = EXT4_IOC_SETVERSION; | |
ac27a0ec | 336 | break; |
617ba13b MC |
337 | case EXT4_IOC32_GROUP_EXTEND: |
338 | cmd = EXT4_IOC_GROUP_EXTEND; | |
ac27a0ec | 339 | break; |
617ba13b MC |
340 | case EXT4_IOC32_GETVERSION_OLD: |
341 | cmd = EXT4_IOC_GETVERSION_OLD; | |
ac27a0ec | 342 | break; |
617ba13b MC |
343 | case EXT4_IOC32_SETVERSION_OLD: |
344 | cmd = EXT4_IOC_SETVERSION_OLD; | |
ac27a0ec | 345 | break; |
e23291b9 | 346 | #ifdef CONFIG_JBD2_DEBUG |
617ba13b MC |
347 | case EXT4_IOC32_WAIT_FOR_READONLY: |
348 | cmd = EXT4_IOC_WAIT_FOR_READONLY; | |
ac27a0ec DK |
349 | break; |
350 | #endif | |
617ba13b MC |
351 | case EXT4_IOC32_GETRSVSZ: |
352 | cmd = EXT4_IOC_GETRSVSZ; | |
ac27a0ec | 353 | break; |
617ba13b MC |
354 | case EXT4_IOC32_SETRSVSZ: |
355 | cmd = EXT4_IOC_SETRSVSZ; | |
ac27a0ec | 356 | break; |
617ba13b | 357 | case EXT4_IOC_GROUP_ADD: |
ac27a0ec DK |
358 | break; |
359 | default: | |
360 | return -ENOIOCTLCMD; | |
361 | } | |
5cdd7b2d | 362 | return ext4_ioctl(file, cmd, (unsigned long) compat_ptr(arg)); |
ac27a0ec DK |
363 | } |
364 | #endif |