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Linux/fs/ext4/ioctl.c

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  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 
 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                 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 
189 unlock_out:
190                 mutex_unlock(&inode->i_mutex);
191 setversion_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);
229 group_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;
275 mext_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);
315 group_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                  * inode_mutex prevent write and truncate on the file.
331                  * Read still goes through. We take i_data_sem in
332                  * ext4_ext_swap_inode_data before we switch the
333                  * inode format to prevent read.
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_file(filp);
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_file(filp);
405 resizefs_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
452 long ext4_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
453 {
454         /* These are just misnamed, they actually get/put from/to user an int */
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 

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