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TOMOYO Linux Cross Reference
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/capability.h>
 12 #include <linux/time.h>
 13 #include <linux/compat.h>
 14 #include <linux/mount.h>
 15 #include <linux/file.h>
 16 #include <linux/random.h>
 17 #include <linux/quotaops.h>
 18 #include <asm/uaccess.h>
 19 #include "ext4_jbd2.h"
 20 #include "ext4.h"
 21 
 22 #define MAX_32_NUM ((((unsigned long long) 1) << 32) - 1)
 23 
 24 /**
 25  * Swap memory between @a and @b for @len bytes.
 26  *
 27  * @a:          pointer to first memory area
 28  * @b:          pointer to second memory area
 29  * @len:        number of bytes to swap
 30  *
 31  */
 32 static void memswap(void *a, void *b, size_t len)
 33 {
 34         unsigned char *ap, *bp;
 35 
 36         ap = (unsigned char *)a;
 37         bp = (unsigned char *)b;
 38         while (len-- > 0) {
 39                 swap(*ap, *bp);
 40                 ap++;
 41                 bp++;
 42         }
 43 }
 44 
 45 /**
 46  * Swap i_data and associated attributes between @inode1 and @inode2.
 47  * This function is used for the primary swap between inode1 and inode2
 48  * and also to revert this primary swap in case of errors.
 49  *
 50  * Therefore you have to make sure, that calling this method twice
 51  * will revert all changes.
 52  *
 53  * @inode1:     pointer to first inode
 54  * @inode2:     pointer to second inode
 55  */
 56 static void swap_inode_data(struct inode *inode1, struct inode *inode2)
 57 {
 58         loff_t isize;
 59         struct ext4_inode_info *ei1;
 60         struct ext4_inode_info *ei2;
 61 
 62         ei1 = EXT4_I(inode1);
 63         ei2 = EXT4_I(inode2);
 64 
 65         memswap(&inode1->i_flags, &inode2->i_flags, sizeof(inode1->i_flags));
 66         memswap(&inode1->i_version, &inode2->i_version,
 67                   sizeof(inode1->i_version));
 68         memswap(&inode1->i_blocks, &inode2->i_blocks,
 69                   sizeof(inode1->i_blocks));
 70         memswap(&inode1->i_bytes, &inode2->i_bytes, sizeof(inode1->i_bytes));
 71         memswap(&inode1->i_atime, &inode2->i_atime, sizeof(inode1->i_atime));
 72         memswap(&inode1->i_mtime, &inode2->i_mtime, sizeof(inode1->i_mtime));
 73 
 74         memswap(ei1->i_data, ei2->i_data, sizeof(ei1->i_data));
 75         memswap(&ei1->i_flags, &ei2->i_flags, sizeof(ei1->i_flags));
 76         memswap(&ei1->i_disksize, &ei2->i_disksize, sizeof(ei1->i_disksize));
 77         ext4_es_remove_extent(inode1, 0, EXT_MAX_BLOCKS);
 78         ext4_es_remove_extent(inode2, 0, EXT_MAX_BLOCKS);
 79 
 80         isize = i_size_read(inode1);
 81         i_size_write(inode1, i_size_read(inode2));
 82         i_size_write(inode2, isize);
 83 }
 84 
 85 /**
 86  * Swap the information from the given @inode and the inode
 87  * EXT4_BOOT_LOADER_INO. It will basically swap i_data and all other
 88  * important fields of the inodes.
 89  *
 90  * @sb:         the super block of the filesystem
 91  * @inode:      the inode to swap with EXT4_BOOT_LOADER_INO
 92  *
 93  */
 94 static long swap_inode_boot_loader(struct super_block *sb,
 95                                 struct inode *inode)
 96 {
 97         handle_t *handle;
 98         int err;
 99         struct inode *inode_bl;
100         struct ext4_inode_info *ei_bl;
101         struct ext4_sb_info *sbi = EXT4_SB(sb);
102 
103         if (inode->i_nlink != 1 || !S_ISREG(inode->i_mode))
104                 return -EINVAL;
105 
106         if (!inode_owner_or_capable(inode) || !capable(CAP_SYS_ADMIN))
107                 return -EPERM;
108 
109         inode_bl = ext4_iget(sb, EXT4_BOOT_LOADER_INO);
110         if (IS_ERR(inode_bl))
111                 return PTR_ERR(inode_bl);
112         ei_bl = EXT4_I(inode_bl);
113 
114         filemap_flush(inode->i_mapping);
115         filemap_flush(inode_bl->i_mapping);
116 
117         /* Protect orig inodes against a truncate and make sure,
118          * that only 1 swap_inode_boot_loader is running. */
119         lock_two_nondirectories(inode, inode_bl);
120 
121         truncate_inode_pages(&inode->i_data, 0);
122         truncate_inode_pages(&inode_bl->i_data, 0);
123 
124         /* Wait for all existing dio workers */
125         ext4_inode_block_unlocked_dio(inode);
126         ext4_inode_block_unlocked_dio(inode_bl);
127         inode_dio_wait(inode);
128         inode_dio_wait(inode_bl);
129 
130         handle = ext4_journal_start(inode_bl, EXT4_HT_MOVE_EXTENTS, 2);
131         if (IS_ERR(handle)) {
132                 err = -EINVAL;
133                 goto journal_err_out;
134         }
135 
136         /* Protect extent tree against block allocations via delalloc */
137         ext4_double_down_write_data_sem(inode, inode_bl);
138 
139         if (inode_bl->i_nlink == 0) {
140                 /* this inode has never been used as a BOOT_LOADER */
141                 set_nlink(inode_bl, 1);
142                 i_uid_write(inode_bl, 0);
143                 i_gid_write(inode_bl, 0);
144                 inode_bl->i_flags = 0;
145                 ei_bl->i_flags = 0;
146                 inode_bl->i_version = 1;
147                 i_size_write(inode_bl, 0);
148                 inode_bl->i_mode = S_IFREG;
149                 if (ext4_has_feature_extents(sb)) {
150                         ext4_set_inode_flag(inode_bl, EXT4_INODE_EXTENTS);
151                         ext4_ext_tree_init(handle, inode_bl);
152                 } else
153                         memset(ei_bl->i_data, 0, sizeof(ei_bl->i_data));
154         }
155 
156         swap_inode_data(inode, inode_bl);
157 
158         inode->i_ctime = inode_bl->i_ctime = ext4_current_time(inode);
159 
160         spin_lock(&sbi->s_next_gen_lock);
161         inode->i_generation = sbi->s_next_generation++;
162         inode_bl->i_generation = sbi->s_next_generation++;
163         spin_unlock(&sbi->s_next_gen_lock);
164 
165         ext4_discard_preallocations(inode);
166 
167         err = ext4_mark_inode_dirty(handle, inode);
168         if (err < 0) {
169                 ext4_warning(inode->i_sb,
170                         "couldn't mark inode #%lu dirty (err %d)",
171                         inode->i_ino, err);
172                 /* Revert all changes: */
173                 swap_inode_data(inode, inode_bl);
174         } else {
175                 err = ext4_mark_inode_dirty(handle, inode_bl);
176                 if (err < 0) {
177                         ext4_warning(inode_bl->i_sb,
178                                 "couldn't mark inode #%lu dirty (err %d)",
179                                 inode_bl->i_ino, err);
180                         /* Revert all changes: */
181                         swap_inode_data(inode, inode_bl);
182                         ext4_mark_inode_dirty(handle, inode);
183                 }
184         }
185         ext4_journal_stop(handle);
186         ext4_double_up_write_data_sem(inode, inode_bl);
187 
188 journal_err_out:
189         ext4_inode_resume_unlocked_dio(inode);
190         ext4_inode_resume_unlocked_dio(inode_bl);
191         unlock_two_nondirectories(inode, inode_bl);
192         iput(inode_bl);
193         return err;
194 }
195 
196 static int uuid_is_zero(__u8 u[16])
197 {
198         int     i;
199 
200         for (i = 0; i < 16; i++)
201                 if (u[i])
202                         return 0;
203         return 1;
204 }
205 
206 static int ext4_ioctl_setflags(struct inode *inode,
207                                unsigned int flags)
208 {
209         struct ext4_inode_info *ei = EXT4_I(inode);
210         handle_t *handle = NULL;
211         int err = -EPERM, migrate = 0;
212         struct ext4_iloc iloc;
213         unsigned int oldflags, mask, i;
214         unsigned int jflag;
215 
216         /* Is it quota file? Do not allow user to mess with it */
217         if (IS_NOQUOTA(inode))
218                 goto flags_out;
219 
220         oldflags = ei->i_flags;
221 
222         /* The JOURNAL_DATA flag is modifiable only by root */
223         jflag = flags & EXT4_JOURNAL_DATA_FL;
224 
225         /*
226          * The IMMUTABLE and APPEND_ONLY flags can only be changed by
227          * the relevant capability.
228          *
229          * This test looks nicer. Thanks to Pauline Middelink
230          */
231         if ((flags ^ oldflags) & (EXT4_APPEND_FL | EXT4_IMMUTABLE_FL)) {
232                 if (!capable(CAP_LINUX_IMMUTABLE))
233                         goto flags_out;
234         }
235 
236         /*
237          * The JOURNAL_DATA flag can only be changed by
238          * the relevant capability.
239          */
240         if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL)) {
241                 if (!capable(CAP_SYS_RESOURCE))
242                         goto flags_out;
243         }
244         if ((flags ^ oldflags) & EXT4_EXTENTS_FL)
245                 migrate = 1;
246 
247         if (flags & EXT4_EOFBLOCKS_FL) {
248                 /* we don't support adding EOFBLOCKS flag */
249                 if (!(oldflags & EXT4_EOFBLOCKS_FL)) {
250                         err = -EOPNOTSUPP;
251                         goto flags_out;
252                 }
253         } else if (oldflags & EXT4_EOFBLOCKS_FL)
254                 ext4_truncate(inode);
255 
256         handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
257         if (IS_ERR(handle)) {
258                 err = PTR_ERR(handle);
259                 goto flags_out;
260         }
261         if (IS_SYNC(inode))
262                 ext4_handle_sync(handle);
263         err = ext4_reserve_inode_write(handle, inode, &iloc);
264         if (err)
265                 goto flags_err;
266 
267         for (i = 0, mask = 1; i < 32; i++, mask <<= 1) {
268                 if (!(mask & EXT4_FL_USER_MODIFIABLE))
269                         continue;
270                 if (mask & flags)
271                         ext4_set_inode_flag(inode, i);
272                 else
273                         ext4_clear_inode_flag(inode, i);
274         }
275 
276         ext4_set_inode_flags(inode);
277         inode->i_ctime = ext4_current_time(inode);
278 
279         err = ext4_mark_iloc_dirty(handle, inode, &iloc);
280 flags_err:
281         ext4_journal_stop(handle);
282         if (err)
283                 goto flags_out;
284 
285         if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL))
286                 err = ext4_change_inode_journal_flag(inode, jflag);
287         if (err)
288                 goto flags_out;
289         if (migrate) {
290                 if (flags & EXT4_EXTENTS_FL)
291                         err = ext4_ext_migrate(inode);
292                 else
293                         err = ext4_ind_migrate(inode);
294         }
295 
296 flags_out:
297         return err;
298 }
299 
300 #ifdef CONFIG_QUOTA
301 static int ext4_ioctl_setproject(struct file *filp, __u32 projid)
302 {
303         struct inode *inode = file_inode(filp);
304         struct super_block *sb = inode->i_sb;
305         struct ext4_inode_info *ei = EXT4_I(inode);
306         int err, rc;
307         handle_t *handle;
308         kprojid_t kprojid;
309         struct ext4_iloc iloc;
310         struct ext4_inode *raw_inode;
311 
312         if (!EXT4_HAS_RO_COMPAT_FEATURE(sb,
313                         EXT4_FEATURE_RO_COMPAT_PROJECT)) {
314                 if (projid != EXT4_DEF_PROJID)
315                         return -EOPNOTSUPP;
316                 else
317                         return 0;
318         }
319 
320         if (EXT4_INODE_SIZE(sb) <= EXT4_GOOD_OLD_INODE_SIZE)
321                 return -EOPNOTSUPP;
322 
323         kprojid = make_kprojid(&init_user_ns, (projid_t)projid);
324 
325         if (projid_eq(kprojid, EXT4_I(inode)->i_projid))
326                 return 0;
327 
328         err = mnt_want_write_file(filp);
329         if (err)
330                 return err;
331 
332         err = -EPERM;
333         inode_lock(inode);
334         /* Is it quota file? Do not allow user to mess with it */
335         if (IS_NOQUOTA(inode))
336                 goto out_unlock;
337 
338         err = ext4_get_inode_loc(inode, &iloc);
339         if (err)
340                 goto out_unlock;
341 
342         raw_inode = ext4_raw_inode(&iloc);
343         if (!EXT4_FITS_IN_INODE(raw_inode, ei, i_projid)) {
344                 err = -EOVERFLOW;
345                 brelse(iloc.bh);
346                 goto out_unlock;
347         }
348         brelse(iloc.bh);
349 
350         dquot_initialize(inode);
351 
352         handle = ext4_journal_start(inode, EXT4_HT_QUOTA,
353                 EXT4_QUOTA_INIT_BLOCKS(sb) +
354                 EXT4_QUOTA_DEL_BLOCKS(sb) + 3);
355         if (IS_ERR(handle)) {
356                 err = PTR_ERR(handle);
357                 goto out_unlock;
358         }
359 
360         err = ext4_reserve_inode_write(handle, inode, &iloc);
361         if (err)
362                 goto out_stop;
363 
364         if (sb_has_quota_limits_enabled(sb, PRJQUOTA)) {
365                 struct dquot *transfer_to[MAXQUOTAS] = { };
366 
367                 transfer_to[PRJQUOTA] = dqget(sb, make_kqid_projid(kprojid));
368                 if (!IS_ERR(transfer_to[PRJQUOTA])) {
369                         err = __dquot_transfer(inode, transfer_to);
370                         dqput(transfer_to[PRJQUOTA]);
371                         if (err)
372                                 goto out_dirty;
373                 }
374         }
375         EXT4_I(inode)->i_projid = kprojid;
376         inode->i_ctime = ext4_current_time(inode);
377 out_dirty:
378         rc = ext4_mark_iloc_dirty(handle, inode, &iloc);
379         if (!err)
380                 err = rc;
381 out_stop:
382         ext4_journal_stop(handle);
383 out_unlock:
384         inode_unlock(inode);
385         mnt_drop_write_file(filp);
386         return err;
387 }
388 #else
389 static int ext4_ioctl_setproject(struct file *filp, __u32 projid)
390 {
391         if (projid != EXT4_DEF_PROJID)
392                 return -EOPNOTSUPP;
393         return 0;
394 }
395 #endif
396 
397 /* Transfer internal flags to xflags */
398 static inline __u32 ext4_iflags_to_xflags(unsigned long iflags)
399 {
400         __u32 xflags = 0;
401 
402         if (iflags & EXT4_SYNC_FL)
403                 xflags |= FS_XFLAG_SYNC;
404         if (iflags & EXT4_IMMUTABLE_FL)
405                 xflags |= FS_XFLAG_IMMUTABLE;
406         if (iflags & EXT4_APPEND_FL)
407                 xflags |= FS_XFLAG_APPEND;
408         if (iflags & EXT4_NODUMP_FL)
409                 xflags |= FS_XFLAG_NODUMP;
410         if (iflags & EXT4_NOATIME_FL)
411                 xflags |= FS_XFLAG_NOATIME;
412         if (iflags & EXT4_PROJINHERIT_FL)
413                 xflags |= FS_XFLAG_PROJINHERIT;
414         return xflags;
415 }
416 
417 /* Transfer xflags flags to internal */
418 static inline unsigned long ext4_xflags_to_iflags(__u32 xflags)
419 {
420         unsigned long iflags = 0;
421 
422         if (xflags & FS_XFLAG_SYNC)
423                 iflags |= EXT4_SYNC_FL;
424         if (xflags & FS_XFLAG_IMMUTABLE)
425                 iflags |= EXT4_IMMUTABLE_FL;
426         if (xflags & FS_XFLAG_APPEND)
427                 iflags |= EXT4_APPEND_FL;
428         if (xflags & FS_XFLAG_NODUMP)
429                 iflags |= EXT4_NODUMP_FL;
430         if (xflags & FS_XFLAG_NOATIME)
431                 iflags |= EXT4_NOATIME_FL;
432         if (xflags & FS_XFLAG_PROJINHERIT)
433                 iflags |= EXT4_PROJINHERIT_FL;
434 
435         return iflags;
436 }
437 
438 long ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
439 {
440         struct inode *inode = file_inode(filp);
441         struct super_block *sb = inode->i_sb;
442         struct ext4_inode_info *ei = EXT4_I(inode);
443         unsigned int flags;
444 
445         ext4_debug("cmd = %u, arg = %lu\n", cmd, arg);
446 
447         switch (cmd) {
448         case EXT4_IOC_GETFLAGS:
449                 ext4_get_inode_flags(ei);
450                 flags = ei->i_flags & EXT4_FL_USER_VISIBLE;
451                 return put_user(flags, (int __user *) arg);
452         case EXT4_IOC_SETFLAGS: {
453                 int err;
454 
455                 if (!inode_owner_or_capable(inode))
456                         return -EACCES;
457 
458                 if (get_user(flags, (int __user *) arg))
459                         return -EFAULT;
460 
461                 err = mnt_want_write_file(filp);
462                 if (err)
463                         return err;
464 
465                 flags = ext4_mask_flags(inode->i_mode, flags);
466 
467                 inode_lock(inode);
468                 err = ext4_ioctl_setflags(inode, flags);
469                 inode_unlock(inode);
470                 mnt_drop_write_file(filp);
471                 return err;
472         }
473         case EXT4_IOC_GETVERSION:
474         case EXT4_IOC_GETVERSION_OLD:
475                 return put_user(inode->i_generation, (int __user *) arg);
476         case EXT4_IOC_SETVERSION:
477         case EXT4_IOC_SETVERSION_OLD: {
478                 handle_t *handle;
479                 struct ext4_iloc iloc;
480                 __u32 generation;
481                 int err;
482 
483                 if (!inode_owner_or_capable(inode))
484                         return -EPERM;
485 
486                 if (ext4_has_metadata_csum(inode->i_sb)) {
487                         ext4_warning(sb, "Setting inode version is not "
488                                      "supported with metadata_csum enabled.");
489                         return -ENOTTY;
490                 }
491 
492                 err = mnt_want_write_file(filp);
493                 if (err)
494                         return err;
495                 if (get_user(generation, (int __user *) arg)) {
496                         err = -EFAULT;
497                         goto setversion_out;
498                 }
499 
500                 inode_lock(inode);
501                 handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
502                 if (IS_ERR(handle)) {
503                         err = PTR_ERR(handle);
504                         goto unlock_out;
505                 }
506                 err = ext4_reserve_inode_write(handle, inode, &iloc);
507                 if (err == 0) {
508                         inode->i_ctime = ext4_current_time(inode);
509                         inode->i_generation = generation;
510                         err = ext4_mark_iloc_dirty(handle, inode, &iloc);
511                 }
512                 ext4_journal_stop(handle);
513 
514 unlock_out:
515                 inode_unlock(inode);
516 setversion_out:
517                 mnt_drop_write_file(filp);
518                 return err;
519         }
520         case EXT4_IOC_GROUP_EXTEND: {
521                 ext4_fsblk_t n_blocks_count;
522                 int err, err2=0;
523 
524                 err = ext4_resize_begin(sb);
525                 if (err)
526                         return err;
527 
528                 if (get_user(n_blocks_count, (__u32 __user *)arg)) {
529                         err = -EFAULT;
530                         goto group_extend_out;
531                 }
532 
533                 if (ext4_has_feature_bigalloc(sb)) {
534                         ext4_msg(sb, KERN_ERR,
535                                  "Online resizing not supported with bigalloc");
536                         err = -EOPNOTSUPP;
537                         goto group_extend_out;
538                 }
539 
540                 err = mnt_want_write_file(filp);
541                 if (err)
542                         goto group_extend_out;
543 
544                 err = ext4_group_extend(sb, EXT4_SB(sb)->s_es, n_blocks_count);
545                 if (EXT4_SB(sb)->s_journal) {
546                         jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
547                         err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
548                         jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
549                 }
550                 if (err == 0)
551                         err = err2;
552                 mnt_drop_write_file(filp);
553 group_extend_out:
554                 ext4_resize_end(sb);
555                 return err;
556         }
557 
558         case EXT4_IOC_MOVE_EXT: {
559                 struct move_extent me;
560                 struct fd donor;
561                 int err;
562 
563                 if (!(filp->f_mode & FMODE_READ) ||
564                     !(filp->f_mode & FMODE_WRITE))
565                         return -EBADF;
566 
567                 if (copy_from_user(&me,
568                         (struct move_extent __user *)arg, sizeof(me)))
569                         return -EFAULT;
570                 me.moved_len = 0;
571 
572                 donor = fdget(me.donor_fd);
573                 if (!donor.file)
574                         return -EBADF;
575 
576                 if (!(donor.file->f_mode & FMODE_WRITE)) {
577                         err = -EBADF;
578                         goto mext_out;
579                 }
580 
581                 if (ext4_has_feature_bigalloc(sb)) {
582                         ext4_msg(sb, KERN_ERR,
583                                  "Online defrag not supported with bigalloc");
584                         err = -EOPNOTSUPP;
585                         goto mext_out;
586                 } else if (IS_DAX(inode)) {
587                         ext4_msg(sb, KERN_ERR,
588                                  "Online defrag not supported with DAX");
589                         err = -EOPNOTSUPP;
590                         goto mext_out;
591                 }
592 
593                 err = mnt_want_write_file(filp);
594                 if (err)
595                         goto mext_out;
596 
597                 err = ext4_move_extents(filp, donor.file, me.orig_start,
598                                         me.donor_start, me.len, &me.moved_len);
599                 mnt_drop_write_file(filp);
600 
601                 if (copy_to_user((struct move_extent __user *)arg,
602                                  &me, sizeof(me)))
603                         err = -EFAULT;
604 mext_out:
605                 fdput(donor);
606                 return err;
607         }
608 
609         case EXT4_IOC_GROUP_ADD: {
610                 struct ext4_new_group_data input;
611                 int err, err2=0;
612 
613                 err = ext4_resize_begin(sb);
614                 if (err)
615                         return err;
616 
617                 if (copy_from_user(&input, (struct ext4_new_group_input __user *)arg,
618                                 sizeof(input))) {
619                         err = -EFAULT;
620                         goto group_add_out;
621                 }
622 
623                 if (ext4_has_feature_bigalloc(sb)) {
624                         ext4_msg(sb, KERN_ERR,
625                                  "Online resizing not supported with bigalloc");
626                         err = -EOPNOTSUPP;
627                         goto group_add_out;
628                 }
629 
630                 err = mnt_want_write_file(filp);
631                 if (err)
632                         goto group_add_out;
633 
634                 err = ext4_group_add(sb, &input);
635                 if (EXT4_SB(sb)->s_journal) {
636                         jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
637                         err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
638                         jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
639                 }
640                 if (err == 0)
641                         err = err2;
642                 mnt_drop_write_file(filp);
643                 if (!err && ext4_has_group_desc_csum(sb) &&
644                     test_opt(sb, INIT_INODE_TABLE))
645                         err = ext4_register_li_request(sb, input.group);
646 group_add_out:
647                 ext4_resize_end(sb);
648                 return err;
649         }
650 
651         case EXT4_IOC_MIGRATE:
652         {
653                 int err;
654                 if (!inode_owner_or_capable(inode))
655                         return -EACCES;
656 
657                 err = mnt_want_write_file(filp);
658                 if (err)
659                         return err;
660                 /*
661                  * inode_mutex prevent write and truncate on the file.
662                  * Read still goes through. We take i_data_sem in
663                  * ext4_ext_swap_inode_data before we switch the
664                  * inode format to prevent read.
665                  */
666                 inode_lock((inode));
667                 err = ext4_ext_migrate(inode);
668                 inode_unlock((inode));
669                 mnt_drop_write_file(filp);
670                 return err;
671         }
672 
673         case EXT4_IOC_ALLOC_DA_BLKS:
674         {
675                 int err;
676                 if (!inode_owner_or_capable(inode))
677                         return -EACCES;
678 
679                 err = mnt_want_write_file(filp);
680                 if (err)
681                         return err;
682                 err = ext4_alloc_da_blocks(inode);
683                 mnt_drop_write_file(filp);
684                 return err;
685         }
686 
687         case EXT4_IOC_SWAP_BOOT:
688         {
689                 int err;
690                 if (!(filp->f_mode & FMODE_WRITE))
691                         return -EBADF;
692                 err = mnt_want_write_file(filp);
693                 if (err)
694                         return err;
695                 err = swap_inode_boot_loader(sb, inode);
696                 mnt_drop_write_file(filp);
697                 return err;
698         }
699 
700         case EXT4_IOC_RESIZE_FS: {
701                 ext4_fsblk_t n_blocks_count;
702                 int err = 0, err2 = 0;
703                 ext4_group_t o_group = EXT4_SB(sb)->s_groups_count;
704 
705                 if (ext4_has_feature_bigalloc(sb)) {
706                         ext4_msg(sb, KERN_ERR,
707                                  "Online resizing not (yet) supported with bigalloc");
708                         return -EOPNOTSUPP;
709                 }
710 
711                 if (copy_from_user(&n_blocks_count, (__u64 __user *)arg,
712                                    sizeof(__u64))) {
713                         return -EFAULT;
714                 }
715 
716                 err = ext4_resize_begin(sb);
717                 if (err)
718                         return err;
719 
720                 err = mnt_want_write_file(filp);
721                 if (err)
722                         goto resizefs_out;
723 
724                 err = ext4_resize_fs(sb, n_blocks_count);
725                 if (EXT4_SB(sb)->s_journal) {
726                         jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
727                         err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
728                         jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
729                 }
730                 if (err == 0)
731                         err = err2;
732                 mnt_drop_write_file(filp);
733                 if (!err && (o_group > EXT4_SB(sb)->s_groups_count) &&
734                     ext4_has_group_desc_csum(sb) &&
735                     test_opt(sb, INIT_INODE_TABLE))
736                         err = ext4_register_li_request(sb, o_group);
737 
738 resizefs_out:
739                 ext4_resize_end(sb);
740                 return err;
741         }
742 
743         case FITRIM:
744         {
745                 struct request_queue *q = bdev_get_queue(sb->s_bdev);
746                 struct fstrim_range range;
747                 int ret = 0;
748 
749                 if (!capable(CAP_SYS_ADMIN))
750                         return -EPERM;
751 
752                 if (!blk_queue_discard(q))
753                         return -EOPNOTSUPP;
754 
755                 if (copy_from_user(&range, (struct fstrim_range __user *)arg,
756                     sizeof(range)))
757                         return -EFAULT;
758 
759                 range.minlen = max((unsigned int)range.minlen,
760                                    q->limits.discard_granularity);
761                 ret = ext4_trim_fs(sb, &range);
762                 if (ret < 0)
763                         return ret;
764 
765                 if (copy_to_user((struct fstrim_range __user *)arg, &range,
766                     sizeof(range)))
767                         return -EFAULT;
768 
769                 return 0;
770         }
771         case EXT4_IOC_PRECACHE_EXTENTS:
772                 return ext4_ext_precache(inode);
773         case EXT4_IOC_SET_ENCRYPTION_POLICY: {
774 #ifdef CONFIG_EXT4_FS_ENCRYPTION
775                 struct ext4_encryption_policy policy;
776                 int err = 0;
777 
778                 if (copy_from_user(&policy,
779                                    (struct ext4_encryption_policy __user *)arg,
780                                    sizeof(policy))) {
781                         err = -EFAULT;
782                         goto encryption_policy_out;
783                 }
784 
785                 err = ext4_process_policy(&policy, inode);
786 encryption_policy_out:
787                 return err;
788 #else
789                 return -EOPNOTSUPP;
790 #endif
791         }
792         case EXT4_IOC_GET_ENCRYPTION_PWSALT: {
793                 int err, err2;
794                 struct ext4_sb_info *sbi = EXT4_SB(sb);
795                 handle_t *handle;
796 
797                 if (!ext4_sb_has_crypto(sb))
798                         return -EOPNOTSUPP;
799                 if (uuid_is_zero(sbi->s_es->s_encrypt_pw_salt)) {
800                         err = mnt_want_write_file(filp);
801                         if (err)
802                                 return err;
803                         handle = ext4_journal_start_sb(sb, EXT4_HT_MISC, 1);
804                         if (IS_ERR(handle)) {
805                                 err = PTR_ERR(handle);
806                                 goto pwsalt_err_exit;
807                         }
808                         err = ext4_journal_get_write_access(handle, sbi->s_sbh);
809                         if (err)
810                                 goto pwsalt_err_journal;
811                         generate_random_uuid(sbi->s_es->s_encrypt_pw_salt);
812                         err = ext4_handle_dirty_metadata(handle, NULL,
813                                                          sbi->s_sbh);
814                 pwsalt_err_journal:
815                         err2 = ext4_journal_stop(handle);
816                         if (err2 && !err)
817                                 err = err2;
818                 pwsalt_err_exit:
819                         mnt_drop_write_file(filp);
820                         if (err)
821                                 return err;
822                 }
823                 if (copy_to_user((void __user *) arg,
824                                  sbi->s_es->s_encrypt_pw_salt, 16))
825                         return -EFAULT;
826                 return 0;
827         }
828         case EXT4_IOC_GET_ENCRYPTION_POLICY: {
829 #ifdef CONFIG_EXT4_FS_ENCRYPTION
830                 struct ext4_encryption_policy policy;
831                 int err = 0;
832 
833                 if (!ext4_encrypted_inode(inode))
834                         return -ENOENT;
835                 err = ext4_get_policy(inode, &policy);
836                 if (err)
837                         return err;
838                 if (copy_to_user((void __user *)arg, &policy, sizeof(policy)))
839                         return -EFAULT;
840                 return 0;
841 #else
842                 return -EOPNOTSUPP;
843 #endif
844         }
845         case EXT4_IOC_FSGETXATTR:
846         {
847                 struct fsxattr fa;
848 
849                 memset(&fa, 0, sizeof(struct fsxattr));
850                 ext4_get_inode_flags(ei);
851                 fa.fsx_xflags = ext4_iflags_to_xflags(ei->i_flags & EXT4_FL_USER_VISIBLE);
852 
853                 if (EXT4_HAS_RO_COMPAT_FEATURE(inode->i_sb,
854                                 EXT4_FEATURE_RO_COMPAT_PROJECT)) {
855                         fa.fsx_projid = (__u32)from_kprojid(&init_user_ns,
856                                 EXT4_I(inode)->i_projid);
857                 }
858 
859                 if (copy_to_user((struct fsxattr __user *)arg,
860                                  &fa, sizeof(fa)))
861                         return -EFAULT;
862                 return 0;
863         }
864         case EXT4_IOC_FSSETXATTR:
865         {
866                 struct fsxattr fa;
867                 int err;
868 
869                 if (copy_from_user(&fa, (struct fsxattr __user *)arg,
870                                    sizeof(fa)))
871                         return -EFAULT;
872 
873                 /* Make sure caller has proper permission */
874                 if (!inode_owner_or_capable(inode))
875                         return -EACCES;
876 
877                 err = mnt_want_write_file(filp);
878                 if (err)
879                         return err;
880 
881                 flags = ext4_xflags_to_iflags(fa.fsx_xflags);
882                 flags = ext4_mask_flags(inode->i_mode, flags);
883 
884                 inode_lock(inode);
885                 flags = (ei->i_flags & ~EXT4_FL_XFLAG_VISIBLE) |
886                          (flags & EXT4_FL_XFLAG_VISIBLE);
887                 err = ext4_ioctl_setflags(inode, flags);
888                 inode_unlock(inode);
889                 mnt_drop_write_file(filp);
890                 if (err)
891                         return err;
892 
893                 err = ext4_ioctl_setproject(filp, fa.fsx_projid);
894                 if (err)
895                         return err;
896 
897                 return 0;
898         }
899         default:
900                 return -ENOTTY;
901         }
902 }
903 
904 #ifdef CONFIG_COMPAT
905 long ext4_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
906 {
907         /* These are just misnamed, they actually get/put from/to user an int */
908         switch (cmd) {
909         case EXT4_IOC32_GETFLAGS:
910                 cmd = EXT4_IOC_GETFLAGS;
911                 break;
912         case EXT4_IOC32_SETFLAGS:
913                 cmd = EXT4_IOC_SETFLAGS;
914                 break;
915         case EXT4_IOC32_GETVERSION:
916                 cmd = EXT4_IOC_GETVERSION;
917                 break;
918         case EXT4_IOC32_SETVERSION:
919                 cmd = EXT4_IOC_SETVERSION;
920                 break;
921         case EXT4_IOC32_GROUP_EXTEND:
922                 cmd = EXT4_IOC_GROUP_EXTEND;
923                 break;
924         case EXT4_IOC32_GETVERSION_OLD:
925                 cmd = EXT4_IOC_GETVERSION_OLD;
926                 break;
927         case EXT4_IOC32_SETVERSION_OLD:
928                 cmd = EXT4_IOC_SETVERSION_OLD;
929                 break;
930         case EXT4_IOC32_GETRSVSZ:
931                 cmd = EXT4_IOC_GETRSVSZ;
932                 break;
933         case EXT4_IOC32_SETRSVSZ:
934                 cmd = EXT4_IOC_SETRSVSZ;
935                 break;
936         case EXT4_IOC32_GROUP_ADD: {
937                 struct compat_ext4_new_group_input __user *uinput;
938                 struct ext4_new_group_input input;
939                 mm_segment_t old_fs;
940                 int err;
941 
942                 uinput = compat_ptr(arg);
943                 err = get_user(input.group, &uinput->group);
944                 err |= get_user(input.block_bitmap, &uinput->block_bitmap);
945                 err |= get_user(input.inode_bitmap, &uinput->inode_bitmap);
946                 err |= get_user(input.inode_table, &uinput->inode_table);
947                 err |= get_user(input.blocks_count, &uinput->blocks_count);
948                 err |= get_user(input.reserved_blocks,
949                                 &uinput->reserved_blocks);
950                 if (err)
951                         return -EFAULT;
952                 old_fs = get_fs();
953                 set_fs(KERNEL_DS);
954                 err = ext4_ioctl(file, EXT4_IOC_GROUP_ADD,
955                                  (unsigned long) &input);
956                 set_fs(old_fs);
957                 return err;
958         }
959         case EXT4_IOC_MOVE_EXT:
960         case EXT4_IOC_RESIZE_FS:
961         case EXT4_IOC_PRECACHE_EXTENTS:
962         case EXT4_IOC_SET_ENCRYPTION_POLICY:
963         case EXT4_IOC_GET_ENCRYPTION_PWSALT:
964         case EXT4_IOC_GET_ENCRYPTION_POLICY:
965                 break;
966         default:
967                 return -ENOIOCTLCMD;
968         }
969         return ext4_ioctl(file, cmd, (unsigned long) compat_ptr(arg));
970 }
971 #endif
972 

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