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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
23long 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
59 if (IS_NOQUOTA(inode))
60 goto flags_out;
61
62 oldflags = ei->i_flags;
63
64
65 jflag = flags & EXT4_JOURNAL_DATA_FL;
66
67
68
69
70
71
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
80
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
88 if (!(flags & EXT4_EXTENTS_FL)) {
89 err = -EOPNOTSUPP;
90 goto flags_out;
91 }
92 } else if (flags & EXT4_EXTENTS_FL) {
93
94 migrate = 1;
95 flags &= ~EXT4_EXTENTS_FL;
96 }
97
98 if (flags & EXT4_EOFBLOCKS_FL) {
99
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);
131flags_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);
142flags_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 if (EXT4_HAS_RO_COMPAT_FEATURE(inode->i_sb,
161 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) {
162 ext4_warning(sb, "Setting inode version is not "
163 "supported with metadata_csum enabled.");
164 return -ENOTTY;
165 }
166
167 err = mnt_want_write_file(filp);
168 if (err)
169 return err;
170 if (get_user(generation, (int __user *) arg)) {
171 err = -EFAULT;
172 goto setversion_out;
173 }
174
175 mutex_lock(&inode->i_mutex);
176 handle = ext4_journal_start(inode, 1);
177 if (IS_ERR(handle)) {
178 err = PTR_ERR(handle);
179 goto unlock_out;
180 }
181 err = ext4_reserve_inode_write(handle, inode, &iloc);
182 if (err == 0) {
183 inode->i_ctime = ext4_current_time(inode);
184 inode->i_generation = generation;
185 err = ext4_mark_iloc_dirty(handle, inode, &iloc);
186 }
187 ext4_journal_stop(handle);
188
189unlock_out:
190 mutex_unlock(&inode->i_mutex);
191setversion_out:
192 mnt_drop_write_file(filp);
193 return err;
194 }
195 case EXT4_IOC_GROUP_EXTEND: {
196 ext4_fsblk_t n_blocks_count;
197 int err, err2=0;
198
199 err = ext4_resize_begin(sb);
200 if (err)
201 return err;
202
203 if (get_user(n_blocks_count, (__u32 __user *)arg)) {
204 err = -EFAULT;
205 goto group_extend_out;
206 }
207
208 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
209 EXT4_FEATURE_RO_COMPAT_BIGALLOC)) {
210 ext4_msg(sb, KERN_ERR,
211 "Online resizing not supported with bigalloc");
212 err = -EOPNOTSUPP;
213 goto group_extend_out;
214 }
215
216 err = mnt_want_write_file(filp);
217 if (err)
218 goto group_extend_out;
219
220 err = ext4_group_extend(sb, EXT4_SB(sb)->s_es, n_blocks_count);
221 if (EXT4_SB(sb)->s_journal) {
222 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
223 err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
224 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
225 }
226 if (err == 0)
227 err = err2;
228 mnt_drop_write_file(filp);
229group_extend_out:
230 ext4_resize_end(sb);
231 return err;
232 }
233
234 case EXT4_IOC_MOVE_EXT: {
235 struct move_extent me;
236 struct file *donor_filp;
237 int err;
238
239 if (!(filp->f_mode & FMODE_READ) ||
240 !(filp->f_mode & FMODE_WRITE))
241 return -EBADF;
242
243 if (copy_from_user(&me,
244 (struct move_extent __user *)arg, sizeof(me)))
245 return -EFAULT;
246 me.moved_len = 0;
247
248 donor_filp = fget(me.donor_fd);
249 if (!donor_filp)
250 return -EBADF;
251
252 if (!(donor_filp->f_mode & FMODE_WRITE)) {
253 err = -EBADF;
254 goto mext_out;
255 }
256
257 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
258 EXT4_FEATURE_RO_COMPAT_BIGALLOC)) {
259 ext4_msg(sb, KERN_ERR,
260 "Online defrag not supported with bigalloc");
261 return -EOPNOTSUPP;
262 }
263
264 err = mnt_want_write_file(filp);
265 if (err)
266 goto mext_out;
267
268 err = ext4_move_extents(filp, donor_filp, me.orig_start,
269 me.donor_start, me.len, &me.moved_len);
270 mnt_drop_write_file(filp);
271
272 if (copy_to_user((struct move_extent __user *)arg,
273 &me, sizeof(me)))
274 err = -EFAULT;
275mext_out:
276 fput(donor_filp);
277 return err;
278 }
279
280 case EXT4_IOC_GROUP_ADD: {
281 struct ext4_new_group_data input;
282 int err, err2=0;
283
284 err = ext4_resize_begin(sb);
285 if (err)
286 return err;
287
288 if (copy_from_user(&input, (struct ext4_new_group_input __user *)arg,
289 sizeof(input))) {
290 err = -EFAULT;
291 goto group_add_out;
292 }
293
294 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
295 EXT4_FEATURE_RO_COMPAT_BIGALLOC)) {
296 ext4_msg(sb, KERN_ERR,
297 "Online resizing not supported with bigalloc");
298 err = -EOPNOTSUPP;
299 goto group_add_out;
300 }
301
302 err = mnt_want_write_file(filp);
303 if (err)
304 goto group_add_out;
305
306 err = ext4_group_add(sb, &input);
307 if (EXT4_SB(sb)->s_journal) {
308 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
309 err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
310 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
311 }
312 if (err == 0)
313 err = err2;
314 mnt_drop_write_file(filp);
315group_add_out:
316 ext4_resize_end(sb);
317 return err;
318 }
319
320 case EXT4_IOC_MIGRATE:
321 {
322 int err;
323 if (!inode_owner_or_capable(inode))
324 return -EACCES;
325
326 err = mnt_want_write_file(filp);
327 if (err)
328 return err;
329
330
331
332
333
334
335 mutex_lock(&(inode->i_mutex));
336 err = ext4_ext_migrate(inode);
337 mutex_unlock(&(inode->i_mutex));
338 mnt_drop_write_file(filp);
339 return err;
340 }
341
342 case EXT4_IOC_ALLOC_DA_BLKS:
343 {
344 int err;
345 if (!inode_owner_or_capable(inode))
346 return -EACCES;
347
348 err = mnt_want_write_file(filp);
349 if (err)
350 return err;
351 err = ext4_alloc_da_blocks(inode);
352 mnt_drop_write_file(filp);
353 return err;
354 }
355
356 case EXT4_IOC_RESIZE_FS: {
357 ext4_fsblk_t n_blocks_count;
358 struct super_block *sb = inode->i_sb;
359 int err = 0, err2 = 0;
360
361 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
362 EXT4_FEATURE_RO_COMPAT_BIGALLOC)) {
363 ext4_msg(sb, KERN_ERR,
364 "Online resizing not (yet) supported with bigalloc");
365 return -EOPNOTSUPP;
366 }
367
368 if (EXT4_HAS_INCOMPAT_FEATURE(sb,
369 EXT4_FEATURE_INCOMPAT_META_BG)) {
370 ext4_msg(sb, KERN_ERR,
371 "Online resizing not (yet) supported with meta_bg");
372 return -EOPNOTSUPP;
373 }
374
375 if (copy_from_user(&n_blocks_count, (__u64 __user *)arg,
376 sizeof(__u64))) {
377 return -EFAULT;
378 }
379
380 if (n_blocks_count > MAX_32_NUM &&
381 !EXT4_HAS_INCOMPAT_FEATURE(sb,
382 EXT4_FEATURE_INCOMPAT_64BIT)) {
383 ext4_msg(sb, KERN_ERR,
384 "File system only supports 32-bit block numbers");
385 return -EOPNOTSUPP;
386 }
387
388 err = ext4_resize_begin(sb);
389 if (err)
390 return err;
391
392 err = mnt_want_write(filp->f_path.mnt);
393 if (err)
394 goto resizefs_out;
395
396 err = ext4_resize_fs(sb, n_blocks_count);
397 if (EXT4_SB(sb)->s_journal) {
398 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
399 err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
400 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
401 }
402 if (err == 0)
403 err = err2;
404 mnt_drop_write(filp->f_path.mnt);
405resizefs_out:
406 ext4_resize_end(sb);
407 return err;
408 }
409
410 case FITRIM:
411 {
412 struct request_queue *q = bdev_get_queue(sb->s_bdev);
413 struct fstrim_range range;
414 int ret = 0;
415
416 if (!capable(CAP_SYS_ADMIN))
417 return -EPERM;
418
419 if (!blk_queue_discard(q))
420 return -EOPNOTSUPP;
421
422 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
423 EXT4_FEATURE_RO_COMPAT_BIGALLOC)) {
424 ext4_msg(sb, KERN_ERR,
425 "FITRIM not supported with bigalloc");
426 return -EOPNOTSUPP;
427 }
428
429 if (copy_from_user(&range, (struct fstrim_range __user *)arg,
430 sizeof(range)))
431 return -EFAULT;
432
433 range.minlen = max((unsigned int)range.minlen,
434 q->limits.discard_granularity);
435 ret = ext4_trim_fs(sb, &range);
436 if (ret < 0)
437 return ret;
438
439 if (copy_to_user((struct fstrim_range __user *)arg, &range,
440 sizeof(range)))
441 return -EFAULT;
442
443 return 0;
444 }
445
446 default:
447 return -ENOTTY;
448 }
449}
450
451#ifdef CONFIG_COMPAT
452long ext4_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
453{
454
455 switch (cmd) {
456 case EXT4_IOC32_GETFLAGS:
457 cmd = EXT4_IOC_GETFLAGS;
458 break;
459 case EXT4_IOC32_SETFLAGS:
460 cmd = EXT4_IOC_SETFLAGS;
461 break;
462 case EXT4_IOC32_GETVERSION:
463 cmd = EXT4_IOC_GETVERSION;
464 break;
465 case EXT4_IOC32_SETVERSION:
466 cmd = EXT4_IOC_SETVERSION;
467 break;
468 case EXT4_IOC32_GROUP_EXTEND:
469 cmd = EXT4_IOC_GROUP_EXTEND;
470 break;
471 case EXT4_IOC32_GETVERSION_OLD:
472 cmd = EXT4_IOC_GETVERSION_OLD;
473 break;
474 case EXT4_IOC32_SETVERSION_OLD:
475 cmd = EXT4_IOC_SETVERSION_OLD;
476 break;
477 case EXT4_IOC32_GETRSVSZ:
478 cmd = EXT4_IOC_GETRSVSZ;
479 break;
480 case EXT4_IOC32_SETRSVSZ:
481 cmd = EXT4_IOC_SETRSVSZ;
482 break;
483 case EXT4_IOC32_GROUP_ADD: {
484 struct compat_ext4_new_group_input __user *uinput;
485 struct ext4_new_group_input input;
486 mm_segment_t old_fs;
487 int err;
488
489 uinput = compat_ptr(arg);
490 err = get_user(input.group, &uinput->group);
491 err |= get_user(input.block_bitmap, &uinput->block_bitmap);
492 err |= get_user(input.inode_bitmap, &uinput->inode_bitmap);
493 err |= get_user(input.inode_table, &uinput->inode_table);
494 err |= get_user(input.blocks_count, &uinput->blocks_count);
495 err |= get_user(input.reserved_blocks,
496 &uinput->reserved_blocks);
497 if (err)
498 return -EFAULT;
499 old_fs = get_fs();
500 set_fs(KERNEL_DS);
501 err = ext4_ioctl(file, EXT4_IOC_GROUP_ADD,
502 (unsigned long) &input);
503 set_fs(old_fs);
504 return err;
505 }
506 case EXT4_IOC_MOVE_EXT:
507 case FITRIM:
508 case EXT4_IOC_RESIZE_FS:
509 break;
510 default:
511 return -ENOIOCTLCMD;
512 }
513 return ext4_ioctl(file, cmd, (unsigned long) compat_ptr(arg));
514}
515#endif
516
