1 /*
2 * linux/fs/ext4/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/jbd2.h>
12 #include <linux/capability.h>
13 #include <linux/time.h>
14 #include <linux/compat.h>
15 #include <linux/mount.h>
16 #include <linux/file.h>
17 #include <asm/uaccess.h>
18 #include "ext4_jbd2.h"
19 #include "ext4.h"
20
21 #define MAX_32_NUM ((((unsigned long long) 1) << 32) - 1)
22
ext4_ioctl(struct file * filp,unsigned int cmd,unsigned long arg)23 long ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
24 {
25 struct inode *inode = filp->f_dentry->d_inode;
26 struct super_block *sb = inode->i_sb;
27 struct ext4_inode_info *ei = EXT4_I(inode);
28 unsigned int flags;
29
30 ext4_debug("cmd = %u, arg = %lu\n", cmd, arg);
31
32 switch (cmd) {
33 case EXT4_IOC_GETFLAGS:
34 ext4_get_inode_flags(ei);
35 flags = ei->i_flags & EXT4_FL_USER_VISIBLE;
36 return put_user(flags, (int __user *) arg);
37 case EXT4_IOC_SETFLAGS: {
38 handle_t *handle = NULL;
39 int err, migrate = 0;
40 struct ext4_iloc iloc;
41 unsigned int oldflags, mask, i;
42 unsigned int jflag;
43
44 if (!inode_owner_or_capable(inode))
45 return -EACCES;
46
47 if (get_user(flags, (int __user *) arg))
48 return -EFAULT;
49
50 err = mnt_want_write_file(filp);
51 if (err)
52 return err;
53
54 flags = ext4_mask_flags(inode->i_mode, flags);
55
56 err = -EPERM;
57 mutex_lock(&inode->i_mutex);
58 /* Is it quota file? Do not allow user to mess with it */
59 if (IS_NOQUOTA(inode))
60 goto flags_out;
61
62 oldflags = ei->i_flags;
63
64 /* The JOURNAL_DATA flag is modifiable only by root */
65 jflag = flags & EXT4_JOURNAL_DATA_FL;
66
67 /*
68 * The IMMUTABLE and APPEND_ONLY flags can only be changed by
69 * the relevant capability.
70 *
71 * This test looks nicer. Thanks to Pauline Middelink
72 */
73 if ((flags ^ oldflags) & (EXT4_APPEND_FL | EXT4_IMMUTABLE_FL)) {
74 if (!capable(CAP_LINUX_IMMUTABLE))
75 goto flags_out;
76 }
77
78 /*
79 * The JOURNAL_DATA flag can only be changed by
80 * the relevant capability.
81 */
82 if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL)) {
83 if (!capable(CAP_SYS_RESOURCE))
84 goto flags_out;
85 }
86 if (oldflags & EXT4_EXTENTS_FL) {
87 /* We don't support clearning extent flags */
88 if (!(flags & EXT4_EXTENTS_FL)) {
89 err = -EOPNOTSUPP;
90 goto flags_out;
91 }
92 } else if (flags & EXT4_EXTENTS_FL) {
93 /* migrate the file */
94 migrate = 1;
95 flags &= ~EXT4_EXTENTS_FL;
96 }
97
98 if (flags & EXT4_EOFBLOCKS_FL) {
99 /* we don't support adding EOFBLOCKS flag */
100 if (!(oldflags & EXT4_EOFBLOCKS_FL)) {
101 err = -EOPNOTSUPP;
102 goto flags_out;
103 }
104 } else if (oldflags & EXT4_EOFBLOCKS_FL)
105 ext4_truncate(inode);
106
107 handle = ext4_journal_start(inode, 1);
108 if (IS_ERR(handle)) {
109 err = PTR_ERR(handle);
110 goto flags_out;
111 }
112 if (IS_SYNC(inode))
113 ext4_handle_sync(handle);
114 err = ext4_reserve_inode_write(handle, inode, &iloc);
115 if (err)
116 goto flags_err;
117
118 for (i = 0, mask = 1; i < 32; i++, mask <<= 1) {
119 if (!(mask & EXT4_FL_USER_MODIFIABLE))
120 continue;
121 if (mask & flags)
122 ext4_set_inode_flag(inode, i);
123 else
124 ext4_clear_inode_flag(inode, i);
125 }
126
127 ext4_set_inode_flags(inode);
128 inode->i_ctime = ext4_current_time(inode);
129
130 err = ext4_mark_iloc_dirty(handle, inode, &iloc);
131 flags_err:
132 ext4_journal_stop(handle);
133 if (err)
134 goto flags_out;
135
136 if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL))
137 err = ext4_change_inode_journal_flag(inode, jflag);
138 if (err)
139 goto flags_out;
140 if (migrate)
141 err = ext4_ext_migrate(inode);
142 flags_out:
143 mutex_unlock(&inode->i_mutex);
144 mnt_drop_write_file(filp);
145 return err;
146 }
147 case EXT4_IOC_GETVERSION:
148 case EXT4_IOC_GETVERSION_OLD:
149 return put_user(inode->i_generation, (int __user *) arg);
150 case EXT4_IOC_SETVERSION:
151 case EXT4_IOC_SETVERSION_OLD: {
152 handle_t *handle;
153 struct ext4_iloc iloc;
154 __u32 generation;
155 int err;
156
157 if (!inode_owner_or_capable(inode))
158 return -EPERM;
159
160 err = mnt_want_write_file(filp);
161 if (err)
162 return err;
163 if (get_user(generation, (int __user *) arg)) {
164 err = -EFAULT;
165 goto setversion_out;
166 }
167
168 mutex_lock(&inode->i_mutex);
169 handle = ext4_journal_start(inode, 1);
170 if (IS_ERR(handle)) {
171 err = PTR_ERR(handle);
172 goto unlock_out;
173 }
174 err = ext4_reserve_inode_write(handle, inode, &iloc);
175 if (err == 0) {
176 inode->i_ctime = ext4_current_time(inode);
177 inode->i_generation = generation;
178 err = ext4_mark_iloc_dirty(handle, inode, &iloc);
179 }
180 ext4_journal_stop(handle);
181
182 unlock_out:
183 mutex_unlock(&inode->i_mutex);
184 setversion_out:
185 mnt_drop_write_file(filp);
186 return err;
187 }
188 case EXT4_IOC_GROUP_EXTEND: {
189 ext4_fsblk_t n_blocks_count;
190 int err, err2=0;
191
192 err = ext4_resize_begin(sb);
193 if (err)
194 return err;
195
196 if (get_user(n_blocks_count, (__u32 __user *)arg)) {
197 err = -EFAULT;
198 goto group_extend_out;
199 }
200
201 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
202 EXT4_FEATURE_RO_COMPAT_BIGALLOC)) {
203 ext4_msg(sb, KERN_ERR,
204 "Online resizing not supported with bigalloc");
205 err = -EOPNOTSUPP;
206 goto group_extend_out;
207 }
208
209 err = mnt_want_write_file(filp);
210 if (err)
211 goto group_extend_out;
212
213 err = ext4_group_extend(sb, EXT4_SB(sb)->s_es, n_blocks_count);
214 if (EXT4_SB(sb)->s_journal) {
215 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
216 err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
217 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
218 }
219 if (err == 0)
220 err = err2;
221 mnt_drop_write_file(filp);
222 group_extend_out:
223 ext4_resize_end(sb);
224 return err;
225 }
226
227 case EXT4_IOC_MOVE_EXT: {
228 struct move_extent me;
229 struct file *donor_filp;
230 int err;
231
232 if (!(filp->f_mode & FMODE_READ) ||
233 !(filp->f_mode & FMODE_WRITE))
234 return -EBADF;
235
236 if (copy_from_user(&me,
237 (struct move_extent __user *)arg, sizeof(me)))
238 return -EFAULT;
239 me.moved_len = 0;
240
241 donor_filp = fget(me.donor_fd);
242 if (!donor_filp)
243 return -EBADF;
244
245 if (!(donor_filp->f_mode & FMODE_WRITE)) {
246 err = -EBADF;
247 goto mext_out;
248 }
249
250 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
251 EXT4_FEATURE_RO_COMPAT_BIGALLOC)) {
252 ext4_msg(sb, KERN_ERR,
253 "Online defrag not supported with bigalloc");
254 return -EOPNOTSUPP;
255 }
256
257 err = mnt_want_write_file(filp);
258 if (err)
259 goto mext_out;
260
261 err = ext4_move_extents(filp, donor_filp, me.orig_start,
262 me.donor_start, me.len, &me.moved_len);
263 mnt_drop_write_file(filp);
264
265 if (copy_to_user((struct move_extent __user *)arg,
266 &me, sizeof(me)))
267 err = -EFAULT;
268 mext_out:
269 fput(donor_filp);
270 return err;
271 }
272
273 case EXT4_IOC_GROUP_ADD: {
274 struct ext4_new_group_data input;
275 int err, err2=0;
276
277 err = ext4_resize_begin(sb);
278 if (err)
279 return err;
280
281 if (copy_from_user(&input, (struct ext4_new_group_input __user *)arg,
282 sizeof(input))) {
283 err = -EFAULT;
284 goto group_add_out;
285 }
286
287 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
288 EXT4_FEATURE_RO_COMPAT_BIGALLOC)) {
289 ext4_msg(sb, KERN_ERR,
290 "Online resizing not supported with bigalloc");
291 err = -EOPNOTSUPP;
292 goto group_add_out;
293 }
294
295 err = mnt_want_write_file(filp);
296 if (err)
297 goto group_add_out;
298
299 err = ext4_group_add(sb, &input);
300 if (EXT4_SB(sb)->s_journal) {
301 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
302 err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
303 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
304 }
305 if (err == 0)
306 err = err2;
307 mnt_drop_write_file(filp);
308 group_add_out:
309 ext4_resize_end(sb);
310 return err;
311 }
312
313 case EXT4_IOC_MIGRATE:
314 {
315 int err;
316 if (!inode_owner_or_capable(inode))
317 return -EACCES;
318
319 err = mnt_want_write_file(filp);
320 if (err)
321 return err;
322 /*
323 * inode_mutex prevent write and truncate on the file.
324 * Read still goes through. We take i_data_sem in
325 * ext4_ext_swap_inode_data before we switch the
326 * inode format to prevent read.
327 */
328 mutex_lock(&(inode->i_mutex));
329 err = ext4_ext_migrate(inode);
330 mutex_unlock(&(inode->i_mutex));
331 mnt_drop_write_file(filp);
332 return err;
333 }
334
335 case EXT4_IOC_ALLOC_DA_BLKS:
336 {
337 int err;
338 if (!inode_owner_or_capable(inode))
339 return -EACCES;
340
341 err = mnt_want_write_file(filp);
342 if (err)
343 return err;
344 err = ext4_alloc_da_blocks(inode);
345 mnt_drop_write_file(filp);
346 return err;
347 }
348
349 case EXT4_IOC_RESIZE_FS: {
350 ext4_fsblk_t n_blocks_count;
351 struct super_block *sb = inode->i_sb;
352 int err = 0, err2 = 0;
353
354 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
355 EXT4_FEATURE_RO_COMPAT_BIGALLOC)) {
356 ext4_msg(sb, KERN_ERR,
357 "Online resizing not (yet) supported with bigalloc");
358 return -EOPNOTSUPP;
359 }
360
361 if (EXT4_HAS_INCOMPAT_FEATURE(sb,
362 EXT4_FEATURE_INCOMPAT_META_BG)) {
363 ext4_msg(sb, KERN_ERR,
364 "Online resizing not (yet) supported with meta_bg");
365 return -EOPNOTSUPP;
366 }
367
368 if (copy_from_user(&n_blocks_count, (__u64 __user *)arg,
369 sizeof(__u64))) {
370 return -EFAULT;
371 }
372
373 if (n_blocks_count > MAX_32_NUM &&
374 !EXT4_HAS_INCOMPAT_FEATURE(sb,
375 EXT4_FEATURE_INCOMPAT_64BIT)) {
376 ext4_msg(sb, KERN_ERR,
377 "File system only supports 32-bit block numbers");
378 return -EOPNOTSUPP;
379 }
380
381 err = ext4_resize_begin(sb);
382 if (err)
383 return err;
384
385 err = mnt_want_write(filp->f_path.mnt);
386 if (err)
387 goto resizefs_out;
388
389 err = ext4_resize_fs(sb, n_blocks_count);
390 if (EXT4_SB(sb)->s_journal) {
391 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
392 err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
393 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
394 }
395 if (err == 0)
396 err = err2;
397 mnt_drop_write(filp->f_path.mnt);
398 resizefs_out:
399 ext4_resize_end(sb);
400 return err;
401 }
402
403 case FITRIM:
404 {
405 struct request_queue *q = bdev_get_queue(sb->s_bdev);
406 struct fstrim_range range;
407 int ret = 0;
408
409 if (!capable(CAP_SYS_ADMIN))
410 return -EPERM;
411
412 if (!blk_queue_discard(q))
413 return -EOPNOTSUPP;
414
415 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
416 EXT4_FEATURE_RO_COMPAT_BIGALLOC)) {
417 ext4_msg(sb, KERN_ERR,
418 "FITRIM not supported with bigalloc");
419 return -EOPNOTSUPP;
420 }
421
422 if (copy_from_user(&range, (struct fstrim_range __user *)arg,
423 sizeof(range)))
424 return -EFAULT;
425
426 range.minlen = max((unsigned int)range.minlen,
427 q->limits.discard_granularity);
428 ret = ext4_trim_fs(sb, &range);
429 if (ret < 0)
430 return ret;
431
432 if (copy_to_user((struct fstrim_range __user *)arg, &range,
433 sizeof(range)))
434 return -EFAULT;
435
436 return 0;
437 }
438
439 default:
440 return -ENOTTY;
441 }
442 }
443
444 #ifdef CONFIG_COMPAT
ext4_compat_ioctl(struct file * file,unsigned int cmd,unsigned long arg)445 long ext4_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
446 {
447 /* These are just misnamed, they actually get/put from/to user an int */
448 switch (cmd) {
449 case EXT4_IOC32_GETFLAGS:
450 cmd = EXT4_IOC_GETFLAGS;
451 break;
452 case EXT4_IOC32_SETFLAGS:
453 cmd = EXT4_IOC_SETFLAGS;
454 break;
455 case EXT4_IOC32_GETVERSION:
456 cmd = EXT4_IOC_GETVERSION;
457 break;
458 case EXT4_IOC32_SETVERSION:
459 cmd = EXT4_IOC_SETVERSION;
460 break;
461 case EXT4_IOC32_GROUP_EXTEND:
462 cmd = EXT4_IOC_GROUP_EXTEND;
463 break;
464 case EXT4_IOC32_GETVERSION_OLD:
465 cmd = EXT4_IOC_GETVERSION_OLD;
466 break;
467 case EXT4_IOC32_SETVERSION_OLD:
468 cmd = EXT4_IOC_SETVERSION_OLD;
469 break;
470 case EXT4_IOC32_GETRSVSZ:
471 cmd = EXT4_IOC_GETRSVSZ;
472 break;
473 case EXT4_IOC32_SETRSVSZ:
474 cmd = EXT4_IOC_SETRSVSZ;
475 break;
476 case EXT4_IOC32_GROUP_ADD: {
477 struct compat_ext4_new_group_input __user *uinput;
478 struct ext4_new_group_input input;
479 mm_segment_t old_fs;
480 int err;
481
482 uinput = compat_ptr(arg);
483 err = get_user(input.group, &uinput->group);
484 err |= get_user(input.block_bitmap, &uinput->block_bitmap);
485 err |= get_user(input.inode_bitmap, &uinput->inode_bitmap);
486 err |= get_user(input.inode_table, &uinput->inode_table);
487 err |= get_user(input.blocks_count, &uinput->blocks_count);
488 err |= get_user(input.reserved_blocks,
489 &uinput->reserved_blocks);
490 if (err)
491 return -EFAULT;
492 old_fs = get_fs();
493 set_fs(KERNEL_DS);
494 err = ext4_ioctl(file, EXT4_IOC_GROUP_ADD,
495 (unsigned long) &input);
496 set_fs(old_fs);
497 return err;
498 }
499 case EXT4_IOC_MOVE_EXT:
500 case FITRIM:
501 case EXT4_IOC_RESIZE_FS:
502 break;
503 default:
504 return -ENOIOCTLCMD;
505 }
506 return ext4_ioctl(file, cmd, (unsigned long) compat_ptr(arg));
507 }
508 #endif
509