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Linux/fs/ext4/ioctl.c

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  1 // SPDX-License-Identifier: GPL-2.0
  2 /*
  3  * linux/fs/ext4/ioctl.c
  4  *
  5  * Copyright (C) 1993, 1994, 1995
  6  * Remy Card (card@masi.ibp.fr)
  7  * Laboratoire MASI - Institut Blaise Pascal
  8  * Universite Pierre et Marie Curie (Paris VI)
  9  */
 10 
 11 #include <linux/fs.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 <linux/quotaops.h>
 18 #include <linux/random.h>
 19 #include <linux/uuid.h>
 20 #include <linux/uaccess.h>
 21 #include <linux/delay.h>
 22 #include <linux/iversion.h>
 23 #include "ext4_jbd2.h"
 24 #include "ext4.h"
 25 #include <linux/fsmap.h>
 26 #include "fsmap.h"
 27 #include <trace/events/ext4.h>
 28 
 29 /**
 30  * Swap memory between @a and @b for @len bytes.
 31  *
 32  * @a:          pointer to first memory area
 33  * @b:          pointer to second memory area
 34  * @len:        number of bytes to swap
 35  *
 36  */
 37 static void memswap(void *a, void *b, size_t len)
 38 {
 39         unsigned char *ap, *bp;
 40 
 41         ap = (unsigned char *)a;
 42         bp = (unsigned char *)b;
 43         while (len-- > 0) {
 44                 swap(*ap, *bp);
 45                 ap++;
 46                 bp++;
 47         }
 48 }
 49 
 50 /**
 51  * Swap i_data and associated attributes between @inode1 and @inode2.
 52  * This function is used for the primary swap between inode1 and inode2
 53  * and also to revert this primary swap in case of errors.
 54  *
 55  * Therefore you have to make sure, that calling this method twice
 56  * will revert all changes.
 57  *
 58  * @inode1:     pointer to first inode
 59  * @inode2:     pointer to second inode
 60  */
 61 static void swap_inode_data(struct inode *inode1, struct inode *inode2)
 62 {
 63         loff_t isize;
 64         struct ext4_inode_info *ei1;
 65         struct ext4_inode_info *ei2;
 66         unsigned long tmp;
 67 
 68         ei1 = EXT4_I(inode1);
 69         ei2 = EXT4_I(inode2);
 70 
 71         swap(inode1->i_version, inode2->i_version);
 72         swap(inode1->i_atime, inode2->i_atime);
 73         swap(inode1->i_mtime, inode2->i_mtime);
 74 
 75         memswap(ei1->i_data, ei2->i_data, sizeof(ei1->i_data));
 76         tmp = ei1->i_flags & EXT4_FL_SHOULD_SWAP;
 77         ei1->i_flags = (ei2->i_flags & EXT4_FL_SHOULD_SWAP) |
 78                 (ei1->i_flags & ~EXT4_FL_SHOULD_SWAP);
 79         ei2->i_flags = tmp | (ei2->i_flags & ~EXT4_FL_SHOULD_SWAP);
 80         swap(ei1->i_disksize, ei2->i_disksize);
 81         ext4_es_remove_extent(inode1, 0, EXT_MAX_BLOCKS);
 82         ext4_es_remove_extent(inode2, 0, EXT_MAX_BLOCKS);
 83 
 84         isize = i_size_read(inode1);
 85         i_size_write(inode1, i_size_read(inode2));
 86         i_size_write(inode2, isize);
 87 }
 88 
 89 static void reset_inode_seed(struct inode *inode)
 90 {
 91         struct ext4_inode_info *ei = EXT4_I(inode);
 92         struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
 93         __le32 inum = cpu_to_le32(inode->i_ino);
 94         __le32 gen = cpu_to_le32(inode->i_generation);
 95         __u32 csum;
 96 
 97         if (!ext4_has_metadata_csum(inode->i_sb))
 98                 return;
 99 
100         csum = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&inum, sizeof(inum));
101         ei->i_csum_seed = ext4_chksum(sbi, csum, (__u8 *)&gen, sizeof(gen));
102 }
103 
104 /**
105  * Swap the information from the given @inode and the inode
106  * EXT4_BOOT_LOADER_INO. It will basically swap i_data and all other
107  * important fields of the inodes.
108  *
109  * @sb:         the super block of the filesystem
110  * @inode:      the inode to swap with EXT4_BOOT_LOADER_INO
111  *
112  */
113 static long swap_inode_boot_loader(struct super_block *sb,
114                                 struct inode *inode)
115 {
116         handle_t *handle;
117         int err;
118         struct inode *inode_bl;
119         struct ext4_inode_info *ei_bl;
120         qsize_t size, size_bl, diff;
121         blkcnt_t blocks;
122         unsigned short bytes;
123 
124         inode_bl = ext4_iget(sb, EXT4_BOOT_LOADER_INO, EXT4_IGET_SPECIAL);
125         if (IS_ERR(inode_bl))
126                 return PTR_ERR(inode_bl);
127         ei_bl = EXT4_I(inode_bl);
128 
129         /* Protect orig inodes against a truncate and make sure,
130          * that only 1 swap_inode_boot_loader is running. */
131         lock_two_nondirectories(inode, inode_bl);
132 
133         if (inode->i_nlink != 1 || !S_ISREG(inode->i_mode) ||
134             IS_SWAPFILE(inode) || IS_ENCRYPTED(inode) ||
135             (EXT4_I(inode)->i_flags & EXT4_JOURNAL_DATA_FL) ||
136             ext4_has_inline_data(inode)) {
137                 err = -EINVAL;
138                 goto journal_err_out;
139         }
140 
141         if (IS_RDONLY(inode) || IS_APPEND(inode) || IS_IMMUTABLE(inode) ||
142             !inode_owner_or_capable(inode) || !capable(CAP_SYS_ADMIN)) {
143                 err = -EPERM;
144                 goto journal_err_out;
145         }
146 
147         down_write(&EXT4_I(inode)->i_mmap_sem);
148         err = filemap_write_and_wait(inode->i_mapping);
149         if (err)
150                 goto err_out;
151 
152         err = filemap_write_and_wait(inode_bl->i_mapping);
153         if (err)
154                 goto err_out;
155 
156         /* Wait for all existing dio workers */
157         inode_dio_wait(inode);
158         inode_dio_wait(inode_bl);
159 
160         truncate_inode_pages(&inode->i_data, 0);
161         truncate_inode_pages(&inode_bl->i_data, 0);
162 
163         handle = ext4_journal_start(inode_bl, EXT4_HT_MOVE_EXTENTS, 2);
164         if (IS_ERR(handle)) {
165                 err = -EINVAL;
166                 goto err_out;
167         }
168 
169         /* Protect extent tree against block allocations via delalloc */
170         ext4_double_down_write_data_sem(inode, inode_bl);
171 
172         if (inode_bl->i_nlink == 0) {
173                 /* this inode has never been used as a BOOT_LOADER */
174                 set_nlink(inode_bl, 1);
175                 i_uid_write(inode_bl, 0);
176                 i_gid_write(inode_bl, 0);
177                 inode_bl->i_flags = 0;
178                 ei_bl->i_flags = 0;
179                 inode_set_iversion(inode_bl, 1);
180                 i_size_write(inode_bl, 0);
181                 inode_bl->i_mode = S_IFREG;
182                 if (ext4_has_feature_extents(sb)) {
183                         ext4_set_inode_flag(inode_bl, EXT4_INODE_EXTENTS);
184                         ext4_ext_tree_init(handle, inode_bl);
185                 } else
186                         memset(ei_bl->i_data, 0, sizeof(ei_bl->i_data));
187         }
188 
189         err = dquot_initialize(inode);
190         if (err)
191                 goto err_out1;
192 
193         size = (qsize_t)(inode->i_blocks) * (1 << 9) + inode->i_bytes;
194         size_bl = (qsize_t)(inode_bl->i_blocks) * (1 << 9) + inode_bl->i_bytes;
195         diff = size - size_bl;
196         swap_inode_data(inode, inode_bl);
197 
198         inode->i_ctime = inode_bl->i_ctime = current_time(inode);
199 
200         inode->i_generation = prandom_u32();
201         inode_bl->i_generation = prandom_u32();
202         reset_inode_seed(inode);
203         reset_inode_seed(inode_bl);
204 
205         ext4_discard_preallocations(inode);
206 
207         err = ext4_mark_inode_dirty(handle, inode);
208         if (err < 0) {
209                 /* No need to update quota information. */
210                 ext4_warning(inode->i_sb,
211                         "couldn't mark inode #%lu dirty (err %d)",
212                         inode->i_ino, err);
213                 /* Revert all changes: */
214                 swap_inode_data(inode, inode_bl);
215                 ext4_mark_inode_dirty(handle, inode);
216                 goto err_out1;
217         }
218 
219         blocks = inode_bl->i_blocks;
220         bytes = inode_bl->i_bytes;
221         inode_bl->i_blocks = inode->i_blocks;
222         inode_bl->i_bytes = inode->i_bytes;
223         err = ext4_mark_inode_dirty(handle, inode_bl);
224         if (err < 0) {
225                 /* No need to update quota information. */
226                 ext4_warning(inode_bl->i_sb,
227                         "couldn't mark inode #%lu dirty (err %d)",
228                         inode_bl->i_ino, err);
229                 goto revert;
230         }
231 
232         /* Bootloader inode should not be counted into quota information. */
233         if (diff > 0)
234                 dquot_free_space(inode, diff);
235         else
236                 err = dquot_alloc_space(inode, -1 * diff);
237 
238         if (err < 0) {
239 revert:
240                 /* Revert all changes: */
241                 inode_bl->i_blocks = blocks;
242                 inode_bl->i_bytes = bytes;
243                 swap_inode_data(inode, inode_bl);
244                 ext4_mark_inode_dirty(handle, inode);
245                 ext4_mark_inode_dirty(handle, inode_bl);
246         }
247 
248 err_out1:
249         ext4_journal_stop(handle);
250         ext4_double_up_write_data_sem(inode, inode_bl);
251 
252 err_out:
253         up_write(&EXT4_I(inode)->i_mmap_sem);
254 journal_err_out:
255         unlock_two_nondirectories(inode, inode_bl);
256         iput(inode_bl);
257         return err;
258 }
259 
260 #ifdef CONFIG_FS_ENCRYPTION
261 static int uuid_is_zero(__u8 u[16])
262 {
263         int     i;
264 
265         for (i = 0; i < 16; i++)
266                 if (u[i])
267                         return 0;
268         return 1;
269 }
270 #endif
271 
272 /*
273  * If immutable is set and we are not clearing it, we're not allowed to change
274  * anything else in the inode.  Don't error out if we're only trying to set
275  * immutable on an immutable file.
276  */
277 static int ext4_ioctl_check_immutable(struct inode *inode, __u32 new_projid,
278                                       unsigned int flags)
279 {
280         struct ext4_inode_info *ei = EXT4_I(inode);
281         unsigned int oldflags = ei->i_flags;
282 
283         if (!(oldflags & EXT4_IMMUTABLE_FL) || !(flags & EXT4_IMMUTABLE_FL))
284                 return 0;
285 
286         if ((oldflags & ~EXT4_IMMUTABLE_FL) != (flags & ~EXT4_IMMUTABLE_FL))
287                 return -EPERM;
288         if (ext4_has_feature_project(inode->i_sb) &&
289             __kprojid_val(ei->i_projid) != new_projid)
290                 return -EPERM;
291 
292         return 0;
293 }
294 
295 static int ext4_ioctl_setflags(struct inode *inode,
296                                unsigned int flags)
297 {
298         struct ext4_inode_info *ei = EXT4_I(inode);
299         handle_t *handle = NULL;
300         int err = -EPERM, migrate = 0;
301         struct ext4_iloc iloc;
302         unsigned int oldflags, mask, i;
303         unsigned int jflag;
304         struct super_block *sb = inode->i_sb;
305 
306         /* Is it quota file? Do not allow user to mess with it */
307         if (ext4_is_quota_file(inode))
308                 goto flags_out;
309 
310         oldflags = ei->i_flags;
311 
312         /* The JOURNAL_DATA flag is modifiable only by root */
313         jflag = flags & EXT4_JOURNAL_DATA_FL;
314 
315         err = vfs_ioc_setflags_prepare(inode, oldflags, flags);
316         if (err)
317                 goto flags_out;
318 
319         /*
320          * The JOURNAL_DATA flag can only be changed by
321          * the relevant capability.
322          */
323         if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL)) {
324                 if (!capable(CAP_SYS_RESOURCE))
325                         goto flags_out;
326         }
327         if ((flags ^ oldflags) & EXT4_EXTENTS_FL)
328                 migrate = 1;
329 
330         if (flags & EXT4_EOFBLOCKS_FL) {
331                 /* we don't support adding EOFBLOCKS flag */
332                 if (!(oldflags & EXT4_EOFBLOCKS_FL)) {
333                         err = -EOPNOTSUPP;
334                         goto flags_out;
335                 }
336         } else if (oldflags & EXT4_EOFBLOCKS_FL) {
337                 err = ext4_truncate(inode);
338                 if (err)
339                         goto flags_out;
340         }
341 
342         if ((flags ^ oldflags) & EXT4_CASEFOLD_FL) {
343                 if (!ext4_has_feature_casefold(sb)) {
344                         err = -EOPNOTSUPP;
345                         goto flags_out;
346                 }
347 
348                 if (!S_ISDIR(inode->i_mode)) {
349                         err = -ENOTDIR;
350                         goto flags_out;
351                 }
352 
353                 if (!ext4_empty_dir(inode)) {
354                         err = -ENOTEMPTY;
355                         goto flags_out;
356                 }
357         }
358 
359         /*
360          * Wait for all pending directio and then flush all the dirty pages
361          * for this file.  The flush marks all the pages readonly, so any
362          * subsequent attempt to write to the file (particularly mmap pages)
363          * will come through the filesystem and fail.
364          */
365         if (S_ISREG(inode->i_mode) && !IS_IMMUTABLE(inode) &&
366             (flags & EXT4_IMMUTABLE_FL)) {
367                 inode_dio_wait(inode);
368                 err = filemap_write_and_wait(inode->i_mapping);
369                 if (err)
370                         goto flags_out;
371         }
372 
373         handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
374         if (IS_ERR(handle)) {
375                 err = PTR_ERR(handle);
376                 goto flags_out;
377         }
378         if (IS_SYNC(inode))
379                 ext4_handle_sync(handle);
380         err = ext4_reserve_inode_write(handle, inode, &iloc);
381         if (err)
382                 goto flags_err;
383 
384         for (i = 0, mask = 1; i < 32; i++, mask <<= 1) {
385                 if (!(mask & EXT4_FL_USER_MODIFIABLE))
386                         continue;
387                 /* These flags get special treatment later */
388                 if (mask == EXT4_JOURNAL_DATA_FL || mask == EXT4_EXTENTS_FL)
389                         continue;
390                 if (mask & flags)
391                         ext4_set_inode_flag(inode, i);
392                 else
393                         ext4_clear_inode_flag(inode, i);
394         }
395 
396         ext4_set_inode_flags(inode);
397         inode->i_ctime = current_time(inode);
398 
399         err = ext4_mark_iloc_dirty(handle, inode, &iloc);
400 flags_err:
401         ext4_journal_stop(handle);
402         if (err)
403                 goto flags_out;
404 
405         if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL)) {
406                 /*
407                  * Changes to the journaling mode can cause unsafe changes to
408                  * S_DAX if we are using the DAX mount option.
409                  */
410                 if (test_opt(inode->i_sb, DAX)) {
411                         err = -EBUSY;
412                         goto flags_out;
413                 }
414 
415                 err = ext4_change_inode_journal_flag(inode, jflag);
416                 if (err)
417                         goto flags_out;
418         }
419         if (migrate) {
420                 if (flags & EXT4_EXTENTS_FL)
421                         err = ext4_ext_migrate(inode);
422                 else
423                         err = ext4_ind_migrate(inode);
424         }
425 
426 flags_out:
427         return err;
428 }
429 
430 #ifdef CONFIG_QUOTA
431 static int ext4_ioctl_setproject(struct file *filp, __u32 projid)
432 {
433         struct inode *inode = file_inode(filp);
434         struct super_block *sb = inode->i_sb;
435         struct ext4_inode_info *ei = EXT4_I(inode);
436         int err, rc;
437         handle_t *handle;
438         kprojid_t kprojid;
439         struct ext4_iloc iloc;
440         struct ext4_inode *raw_inode;
441         struct dquot *transfer_to[MAXQUOTAS] = { };
442 
443         if (!ext4_has_feature_project(sb)) {
444                 if (projid != EXT4_DEF_PROJID)
445                         return -EOPNOTSUPP;
446                 else
447                         return 0;
448         }
449 
450         if (EXT4_INODE_SIZE(sb) <= EXT4_GOOD_OLD_INODE_SIZE)
451                 return -EOPNOTSUPP;
452 
453         kprojid = make_kprojid(&init_user_ns, (projid_t)projid);
454 
455         if (projid_eq(kprojid, EXT4_I(inode)->i_projid))
456                 return 0;
457 
458         err = -EPERM;
459         /* Is it quota file? Do not allow user to mess with it */
460         if (ext4_is_quota_file(inode))
461                 return err;
462 
463         err = ext4_get_inode_loc(inode, &iloc);
464         if (err)
465                 return err;
466 
467         raw_inode = ext4_raw_inode(&iloc);
468         if (!EXT4_FITS_IN_INODE(raw_inode, ei, i_projid)) {
469                 err = ext4_expand_extra_isize(inode,
470                                               EXT4_SB(sb)->s_want_extra_isize,
471                                               &iloc);
472                 if (err)
473                         return err;
474         } else {
475                 brelse(iloc.bh);
476         }
477 
478         err = dquot_initialize(inode);
479         if (err)
480                 return err;
481 
482         handle = ext4_journal_start(inode, EXT4_HT_QUOTA,
483                 EXT4_QUOTA_INIT_BLOCKS(sb) +
484                 EXT4_QUOTA_DEL_BLOCKS(sb) + 3);
485         if (IS_ERR(handle))
486                 return PTR_ERR(handle);
487 
488         err = ext4_reserve_inode_write(handle, inode, &iloc);
489         if (err)
490                 goto out_stop;
491 
492         transfer_to[PRJQUOTA] = dqget(sb, make_kqid_projid(kprojid));
493         if (!IS_ERR(transfer_to[PRJQUOTA])) {
494 
495                 /* __dquot_transfer() calls back ext4_get_inode_usage() which
496                  * counts xattr inode references.
497                  */
498                 down_read(&EXT4_I(inode)->xattr_sem);
499                 err = __dquot_transfer(inode, transfer_to);
500                 up_read(&EXT4_I(inode)->xattr_sem);
501                 dqput(transfer_to[PRJQUOTA]);
502                 if (err)
503                         goto out_dirty;
504         }
505 
506         EXT4_I(inode)->i_projid = kprojid;
507         inode->i_ctime = current_time(inode);
508 out_dirty:
509         rc = ext4_mark_iloc_dirty(handle, inode, &iloc);
510         if (!err)
511                 err = rc;
512 out_stop:
513         ext4_journal_stop(handle);
514         return err;
515 }
516 #else
517 static int ext4_ioctl_setproject(struct file *filp, __u32 projid)
518 {
519         if (projid != EXT4_DEF_PROJID)
520                 return -EOPNOTSUPP;
521         return 0;
522 }
523 #endif
524 
525 /* Transfer internal flags to xflags */
526 static inline __u32 ext4_iflags_to_xflags(unsigned long iflags)
527 {
528         __u32 xflags = 0;
529 
530         if (iflags & EXT4_SYNC_FL)
531                 xflags |= FS_XFLAG_SYNC;
532         if (iflags & EXT4_IMMUTABLE_FL)
533                 xflags |= FS_XFLAG_IMMUTABLE;
534         if (iflags & EXT4_APPEND_FL)
535                 xflags |= FS_XFLAG_APPEND;
536         if (iflags & EXT4_NODUMP_FL)
537                 xflags |= FS_XFLAG_NODUMP;
538         if (iflags & EXT4_NOATIME_FL)
539                 xflags |= FS_XFLAG_NOATIME;
540         if (iflags & EXT4_PROJINHERIT_FL)
541                 xflags |= FS_XFLAG_PROJINHERIT;
542         return xflags;
543 }
544 
545 #define EXT4_SUPPORTED_FS_XFLAGS (FS_XFLAG_SYNC | FS_XFLAG_IMMUTABLE | \
546                                   FS_XFLAG_APPEND | FS_XFLAG_NODUMP | \
547                                   FS_XFLAG_NOATIME | FS_XFLAG_PROJINHERIT)
548 
549 /* Transfer xflags flags to internal */
550 static inline unsigned long ext4_xflags_to_iflags(__u32 xflags)
551 {
552         unsigned long iflags = 0;
553 
554         if (xflags & FS_XFLAG_SYNC)
555                 iflags |= EXT4_SYNC_FL;
556         if (xflags & FS_XFLAG_IMMUTABLE)
557                 iflags |= EXT4_IMMUTABLE_FL;
558         if (xflags & FS_XFLAG_APPEND)
559                 iflags |= EXT4_APPEND_FL;
560         if (xflags & FS_XFLAG_NODUMP)
561                 iflags |= EXT4_NODUMP_FL;
562         if (xflags & FS_XFLAG_NOATIME)
563                 iflags |= EXT4_NOATIME_FL;
564         if (xflags & FS_XFLAG_PROJINHERIT)
565                 iflags |= EXT4_PROJINHERIT_FL;
566 
567         return iflags;
568 }
569 
570 static int ext4_shutdown(struct super_block *sb, unsigned long arg)
571 {
572         struct ext4_sb_info *sbi = EXT4_SB(sb);
573         __u32 flags;
574 
575         if (!capable(CAP_SYS_ADMIN))
576                 return -EPERM;
577 
578         if (get_user(flags, (__u32 __user *)arg))
579                 return -EFAULT;
580 
581         if (flags > EXT4_GOING_FLAGS_NOLOGFLUSH)
582                 return -EINVAL;
583 
584         if (ext4_forced_shutdown(sbi))
585                 return 0;
586 
587         ext4_msg(sb, KERN_ALERT, "shut down requested (%d)", flags);
588         trace_ext4_shutdown(sb, flags);
589 
590         switch (flags) {
591         case EXT4_GOING_FLAGS_DEFAULT:
592                 freeze_bdev(sb->s_bdev);
593                 set_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
594                 thaw_bdev(sb->s_bdev, sb);
595                 break;
596         case EXT4_GOING_FLAGS_LOGFLUSH:
597                 set_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
598                 if (sbi->s_journal && !is_journal_aborted(sbi->s_journal)) {
599                         (void) ext4_force_commit(sb);
600                         jbd2_journal_abort(sbi->s_journal, -ESHUTDOWN);
601                 }
602                 break;
603         case EXT4_GOING_FLAGS_NOLOGFLUSH:
604                 set_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
605                 if (sbi->s_journal && !is_journal_aborted(sbi->s_journal))
606                         jbd2_journal_abort(sbi->s_journal, -ESHUTDOWN);
607                 break;
608         default:
609                 return -EINVAL;
610         }
611         clear_opt(sb, DISCARD);
612         return 0;
613 }
614 
615 struct getfsmap_info {
616         struct super_block      *gi_sb;
617         struct fsmap_head __user *gi_data;
618         unsigned int            gi_idx;
619         __u32                   gi_last_flags;
620 };
621 
622 static int ext4_getfsmap_format(struct ext4_fsmap *xfm, void *priv)
623 {
624         struct getfsmap_info *info = priv;
625         struct fsmap fm;
626 
627         trace_ext4_getfsmap_mapping(info->gi_sb, xfm);
628 
629         info->gi_last_flags = xfm->fmr_flags;
630         ext4_fsmap_from_internal(info->gi_sb, &fm, xfm);
631         if (copy_to_user(&info->gi_data->fmh_recs[info->gi_idx++], &fm,
632                         sizeof(struct fsmap)))
633                 return -EFAULT;
634 
635         return 0;
636 }
637 
638 static int ext4_ioc_getfsmap(struct super_block *sb,
639                              struct fsmap_head __user *arg)
640 {
641         struct getfsmap_info info = { NULL };
642         struct ext4_fsmap_head xhead = {0};
643         struct fsmap_head head;
644         bool aborted = false;
645         int error;
646 
647         if (copy_from_user(&head, arg, sizeof(struct fsmap_head)))
648                 return -EFAULT;
649         if (memchr_inv(head.fmh_reserved, 0, sizeof(head.fmh_reserved)) ||
650             memchr_inv(head.fmh_keys[0].fmr_reserved, 0,
651                        sizeof(head.fmh_keys[0].fmr_reserved)) ||
652             memchr_inv(head.fmh_keys[1].fmr_reserved, 0,
653                        sizeof(head.fmh_keys[1].fmr_reserved)))
654                 return -EINVAL;
655         /*
656          * ext4 doesn't report file extents at all, so the only valid
657          * file offsets are the magic ones (all zeroes or all ones).
658          */
659         if (head.fmh_keys[0].fmr_offset ||
660             (head.fmh_keys[1].fmr_offset != 0 &&
661              head.fmh_keys[1].fmr_offset != -1ULL))
662                 return -EINVAL;
663 
664         xhead.fmh_iflags = head.fmh_iflags;
665         xhead.fmh_count = head.fmh_count;
666         ext4_fsmap_to_internal(sb, &xhead.fmh_keys[0], &head.fmh_keys[0]);
667         ext4_fsmap_to_internal(sb, &xhead.fmh_keys[1], &head.fmh_keys[1]);
668 
669         trace_ext4_getfsmap_low_key(sb, &xhead.fmh_keys[0]);
670         trace_ext4_getfsmap_high_key(sb, &xhead.fmh_keys[1]);
671 
672         info.gi_sb = sb;
673         info.gi_data = arg;
674         error = ext4_getfsmap(sb, &xhead, ext4_getfsmap_format, &info);
675         if (error == EXT4_QUERY_RANGE_ABORT) {
676                 error = 0;
677                 aborted = true;
678         } else if (error)
679                 return error;
680 
681         /* If we didn't abort, set the "last" flag in the last fmx */
682         if (!aborted && info.gi_idx) {
683                 info.gi_last_flags |= FMR_OF_LAST;
684                 if (copy_to_user(&info.gi_data->fmh_recs[info.gi_idx - 1].fmr_flags,
685                                  &info.gi_last_flags,
686                                  sizeof(info.gi_last_flags)))
687                         return -EFAULT;
688         }
689 
690         /* copy back header */
691         head.fmh_entries = xhead.fmh_entries;
692         head.fmh_oflags = xhead.fmh_oflags;
693         if (copy_to_user(arg, &head, sizeof(struct fsmap_head)))
694                 return -EFAULT;
695 
696         return 0;
697 }
698 
699 static long ext4_ioctl_group_add(struct file *file,
700                                  struct ext4_new_group_data *input)
701 {
702         struct super_block *sb = file_inode(file)->i_sb;
703         int err, err2=0;
704 
705         err = ext4_resize_begin(sb);
706         if (err)
707                 return err;
708 
709         if (ext4_has_feature_bigalloc(sb)) {
710                 ext4_msg(sb, KERN_ERR,
711                          "Online resizing not supported with bigalloc");
712                 err = -EOPNOTSUPP;
713                 goto group_add_out;
714         }
715 
716         err = mnt_want_write_file(file);
717         if (err)
718                 goto group_add_out;
719 
720         err = ext4_group_add(sb, input);
721         if (EXT4_SB(sb)->s_journal) {
722                 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
723                 err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
724                 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
725         }
726         if (err == 0)
727                 err = err2;
728         mnt_drop_write_file(file);
729         if (!err && ext4_has_group_desc_csum(sb) &&
730             test_opt(sb, INIT_INODE_TABLE))
731                 err = ext4_register_li_request(sb, input->group);
732 group_add_out:
733         ext4_resize_end(sb);
734         return err;
735 }
736 
737 static void ext4_fill_fsxattr(struct inode *inode, struct fsxattr *fa)
738 {
739         struct ext4_inode_info *ei = EXT4_I(inode);
740 
741         simple_fill_fsxattr(fa, ext4_iflags_to_xflags(ei->i_flags &
742                                                       EXT4_FL_USER_VISIBLE));
743 
744         if (ext4_has_feature_project(inode->i_sb))
745                 fa->fsx_projid = from_kprojid(&init_user_ns, ei->i_projid);
746 }
747 
748 long ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
749 {
750         struct inode *inode = file_inode(filp);
751         struct super_block *sb = inode->i_sb;
752         struct ext4_inode_info *ei = EXT4_I(inode);
753         unsigned int flags;
754 
755         ext4_debug("cmd = %u, arg = %lu\n", cmd, arg);
756 
757         switch (cmd) {
758         case FS_IOC_GETFSMAP:
759                 return ext4_ioc_getfsmap(sb, (void __user *)arg);
760         case EXT4_IOC_GETFLAGS:
761                 flags = ei->i_flags & EXT4_FL_USER_VISIBLE;
762                 if (S_ISREG(inode->i_mode))
763                         flags &= ~EXT4_PROJINHERIT_FL;
764                 return put_user(flags, (int __user *) arg);
765         case EXT4_IOC_SETFLAGS: {
766                 int err;
767 
768                 if (!inode_owner_or_capable(inode))
769                         return -EACCES;
770 
771                 if (get_user(flags, (int __user *) arg))
772                         return -EFAULT;
773 
774                 if (flags & ~EXT4_FL_USER_VISIBLE)
775                         return -EOPNOTSUPP;
776                 /*
777                  * chattr(1) grabs flags via GETFLAGS, modifies the result and
778                  * passes that to SETFLAGS. So we cannot easily make SETFLAGS
779                  * more restrictive than just silently masking off visible but
780                  * not settable flags as we always did.
781                  */
782                 flags &= EXT4_FL_USER_MODIFIABLE;
783                 if (ext4_mask_flags(inode->i_mode, flags) != flags)
784                         return -EOPNOTSUPP;
785 
786                 err = mnt_want_write_file(filp);
787                 if (err)
788                         return err;
789 
790                 inode_lock(inode);
791                 err = ext4_ioctl_check_immutable(inode,
792                                 from_kprojid(&init_user_ns, ei->i_projid),
793                                 flags);
794                 if (!err)
795                         err = ext4_ioctl_setflags(inode, flags);
796                 inode_unlock(inode);
797                 mnt_drop_write_file(filp);
798                 return err;
799         }
800         case EXT4_IOC_GETVERSION:
801         case EXT4_IOC_GETVERSION_OLD:
802                 return put_user(inode->i_generation, (int __user *) arg);
803         case EXT4_IOC_SETVERSION:
804         case EXT4_IOC_SETVERSION_OLD: {
805                 handle_t *handle;
806                 struct ext4_iloc iloc;
807                 __u32 generation;
808                 int err;
809 
810                 if (!inode_owner_or_capable(inode))
811                         return -EPERM;
812 
813                 if (ext4_has_metadata_csum(inode->i_sb)) {
814                         ext4_warning(sb, "Setting inode version is not "
815                                      "supported with metadata_csum enabled.");
816                         return -ENOTTY;
817                 }
818 
819                 err = mnt_want_write_file(filp);
820                 if (err)
821                         return err;
822                 if (get_user(generation, (int __user *) arg)) {
823                         err = -EFAULT;
824                         goto setversion_out;
825                 }
826 
827                 inode_lock(inode);
828                 handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
829                 if (IS_ERR(handle)) {
830                         err = PTR_ERR(handle);
831                         goto unlock_out;
832                 }
833                 err = ext4_reserve_inode_write(handle, inode, &iloc);
834                 if (err == 0) {
835                         inode->i_ctime = current_time(inode);
836                         inode->i_generation = generation;
837                         err = ext4_mark_iloc_dirty(handle, inode, &iloc);
838                 }
839                 ext4_journal_stop(handle);
840 
841 unlock_out:
842                 inode_unlock(inode);
843 setversion_out:
844                 mnt_drop_write_file(filp);
845                 return err;
846         }
847         case EXT4_IOC_GROUP_EXTEND: {
848                 ext4_fsblk_t n_blocks_count;
849                 int err, err2=0;
850 
851                 err = ext4_resize_begin(sb);
852                 if (err)
853                         return err;
854 
855                 if (get_user(n_blocks_count, (__u32 __user *)arg)) {
856                         err = -EFAULT;
857                         goto group_extend_out;
858                 }
859 
860                 if (ext4_has_feature_bigalloc(sb)) {
861                         ext4_msg(sb, KERN_ERR,
862                                  "Online resizing not supported with bigalloc");
863                         err = -EOPNOTSUPP;
864                         goto group_extend_out;
865                 }
866 
867                 err = mnt_want_write_file(filp);
868                 if (err)
869                         goto group_extend_out;
870 
871                 err = ext4_group_extend(sb, EXT4_SB(sb)->s_es, n_blocks_count);
872                 if (EXT4_SB(sb)->s_journal) {
873                         jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
874                         err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
875                         jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
876                 }
877                 if (err == 0)
878                         err = err2;
879                 mnt_drop_write_file(filp);
880 group_extend_out:
881                 ext4_resize_end(sb);
882                 return err;
883         }
884 
885         case EXT4_IOC_MOVE_EXT: {
886                 struct move_extent me;
887                 struct fd donor;
888                 int err;
889 
890                 if (!(filp->f_mode & FMODE_READ) ||
891                     !(filp->f_mode & FMODE_WRITE))
892                         return -EBADF;
893 
894                 if (copy_from_user(&me,
895                         (struct move_extent __user *)arg, sizeof(me)))
896                         return -EFAULT;
897                 me.moved_len = 0;
898 
899                 donor = fdget(me.donor_fd);
900                 if (!donor.file)
901                         return -EBADF;
902 
903                 if (!(donor.file->f_mode & FMODE_WRITE)) {
904                         err = -EBADF;
905                         goto mext_out;
906                 }
907 
908                 if (ext4_has_feature_bigalloc(sb)) {
909                         ext4_msg(sb, KERN_ERR,
910                                  "Online defrag not supported with bigalloc");
911                         err = -EOPNOTSUPP;
912                         goto mext_out;
913                 } else if (IS_DAX(inode)) {
914                         ext4_msg(sb, KERN_ERR,
915                                  "Online defrag not supported with DAX");
916                         err = -EOPNOTSUPP;
917                         goto mext_out;
918                 }
919 
920                 err = mnt_want_write_file(filp);
921                 if (err)
922                         goto mext_out;
923 
924                 err = ext4_move_extents(filp, donor.file, me.orig_start,
925                                         me.donor_start, me.len, &me.moved_len);
926                 mnt_drop_write_file(filp);
927 
928                 if (copy_to_user((struct move_extent __user *)arg,
929                                  &me, sizeof(me)))
930                         err = -EFAULT;
931 mext_out:
932                 fdput(donor);
933                 return err;
934         }
935 
936         case EXT4_IOC_GROUP_ADD: {
937                 struct ext4_new_group_data input;
938 
939                 if (copy_from_user(&input, (struct ext4_new_group_input __user *)arg,
940                                 sizeof(input)))
941                         return -EFAULT;
942 
943                 return ext4_ioctl_group_add(filp, &input);
944         }
945 
946         case EXT4_IOC_MIGRATE:
947         {
948                 int err;
949                 if (!inode_owner_or_capable(inode))
950                         return -EACCES;
951 
952                 err = mnt_want_write_file(filp);
953                 if (err)
954                         return err;
955                 /*
956                  * inode_mutex prevent write and truncate on the file.
957                  * Read still goes through. We take i_data_sem in
958                  * ext4_ext_swap_inode_data before we switch the
959                  * inode format to prevent read.
960                  */
961                 inode_lock((inode));
962                 err = ext4_ext_migrate(inode);
963                 inode_unlock((inode));
964                 mnt_drop_write_file(filp);
965                 return err;
966         }
967 
968         case EXT4_IOC_ALLOC_DA_BLKS:
969         {
970                 int err;
971                 if (!inode_owner_or_capable(inode))
972                         return -EACCES;
973 
974                 err = mnt_want_write_file(filp);
975                 if (err)
976                         return err;
977                 err = ext4_alloc_da_blocks(inode);
978                 mnt_drop_write_file(filp);
979                 return err;
980         }
981 
982         case EXT4_IOC_SWAP_BOOT:
983         {
984                 int err;
985                 if (!(filp->f_mode & FMODE_WRITE))
986                         return -EBADF;
987                 err = mnt_want_write_file(filp);
988                 if (err)
989                         return err;
990                 err = swap_inode_boot_loader(sb, inode);
991                 mnt_drop_write_file(filp);
992                 return err;
993         }
994 
995         case EXT4_IOC_RESIZE_FS: {
996                 ext4_fsblk_t n_blocks_count;
997                 int err = 0, err2 = 0;
998                 ext4_group_t o_group = EXT4_SB(sb)->s_groups_count;
999 
1000                 if (copy_from_user(&n_blocks_count, (__u64 __user *)arg,
1001                                    sizeof(__u64))) {
1002                         return -EFAULT;
1003                 }
1004 
1005                 err = ext4_resize_begin(sb);
1006                 if (err)
1007                         return err;
1008 
1009                 err = mnt_want_write_file(filp);
1010                 if (err)
1011                         goto resizefs_out;
1012 
1013                 err = ext4_resize_fs(sb, n_blocks_count);
1014                 if (EXT4_SB(sb)->s_journal) {
1015                         jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
1016                         err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
1017                         jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
1018                 }
1019                 if (err == 0)
1020                         err = err2;
1021                 mnt_drop_write_file(filp);
1022                 if (!err && (o_group < EXT4_SB(sb)->s_groups_count) &&
1023                     ext4_has_group_desc_csum(sb) &&
1024                     test_opt(sb, INIT_INODE_TABLE))
1025                         err = ext4_register_li_request(sb, o_group);
1026 
1027 resizefs_out:
1028                 ext4_resize_end(sb);
1029                 return err;
1030         }
1031 
1032         case FITRIM:
1033         {
1034                 struct request_queue *q = bdev_get_queue(sb->s_bdev);
1035                 struct fstrim_range range;
1036                 int ret = 0;
1037 
1038                 if (!capable(CAP_SYS_ADMIN))
1039                         return -EPERM;
1040 
1041                 if (!blk_queue_discard(q))
1042                         return -EOPNOTSUPP;
1043 
1044                 /*
1045                  * We haven't replayed the journal, so we cannot use our
1046                  * block-bitmap-guided storage zapping commands.
1047                  */
1048                 if (test_opt(sb, NOLOAD) && ext4_has_feature_journal(sb))
1049                         return -EROFS;
1050 
1051                 if (copy_from_user(&range, (struct fstrim_range __user *)arg,
1052                     sizeof(range)))
1053                         return -EFAULT;
1054 
1055                 range.minlen = max((unsigned int)range.minlen,
1056                                    q->limits.discard_granularity);
1057                 ret = ext4_trim_fs(sb, &range);
1058                 if (ret < 0)
1059                         return ret;
1060 
1061                 if (copy_to_user((struct fstrim_range __user *)arg, &range,
1062                     sizeof(range)))
1063                         return -EFAULT;
1064 
1065                 return 0;
1066         }
1067         case EXT4_IOC_PRECACHE_EXTENTS:
1068                 return ext4_ext_precache(inode);
1069 
1070         case EXT4_IOC_SET_ENCRYPTION_POLICY:
1071                 if (!ext4_has_feature_encrypt(sb))
1072                         return -EOPNOTSUPP;
1073                 return fscrypt_ioctl_set_policy(filp, (const void __user *)arg);
1074 
1075         case EXT4_IOC_GET_ENCRYPTION_PWSALT: {
1076 #ifdef CONFIG_FS_ENCRYPTION
1077                 int err, err2;
1078                 struct ext4_sb_info *sbi = EXT4_SB(sb);
1079                 handle_t *handle;
1080 
1081                 if (!ext4_has_feature_encrypt(sb))
1082                         return -EOPNOTSUPP;
1083                 if (uuid_is_zero(sbi->s_es->s_encrypt_pw_salt)) {
1084                         err = mnt_want_write_file(filp);
1085                         if (err)
1086                                 return err;
1087                         handle = ext4_journal_start_sb(sb, EXT4_HT_MISC, 1);
1088                         if (IS_ERR(handle)) {
1089                                 err = PTR_ERR(handle);
1090                                 goto pwsalt_err_exit;
1091                         }
1092                         err = ext4_journal_get_write_access(handle, sbi->s_sbh);
1093                         if (err)
1094                                 goto pwsalt_err_journal;
1095                         generate_random_uuid(sbi->s_es->s_encrypt_pw_salt);
1096                         err = ext4_handle_dirty_metadata(handle, NULL,
1097                                                          sbi->s_sbh);
1098                 pwsalt_err_journal:
1099                         err2 = ext4_journal_stop(handle);
1100                         if (err2 && !err)
1101                                 err = err2;
1102                 pwsalt_err_exit:
1103                         mnt_drop_write_file(filp);
1104                         if (err)
1105                                 return err;
1106                 }
1107                 if (copy_to_user((void __user *) arg,
1108                                  sbi->s_es->s_encrypt_pw_salt, 16))
1109                         return -EFAULT;
1110                 return 0;
1111 #else
1112                 return -EOPNOTSUPP;
1113 #endif
1114         }
1115         case EXT4_IOC_GET_ENCRYPTION_POLICY:
1116                 return fscrypt_ioctl_get_policy(filp, (void __user *)arg);
1117 
1118         case EXT4_IOC_FSGETXATTR:
1119         {
1120                 struct fsxattr fa;
1121 
1122                 ext4_fill_fsxattr(inode, &fa);
1123 
1124                 if (copy_to_user((struct fsxattr __user *)arg,
1125                                  &fa, sizeof(fa)))
1126                         return -EFAULT;
1127                 return 0;
1128         }
1129         case EXT4_IOC_FSSETXATTR:
1130         {
1131                 struct fsxattr fa, old_fa;
1132                 int err;
1133 
1134                 if (copy_from_user(&fa, (struct fsxattr __user *)arg,
1135                                    sizeof(fa)))
1136                         return -EFAULT;
1137 
1138                 /* Make sure caller has proper permission */
1139                 if (!inode_owner_or_capable(inode))
1140                         return -EACCES;
1141 
1142                 if (fa.fsx_xflags & ~EXT4_SUPPORTED_FS_XFLAGS)
1143                         return -EOPNOTSUPP;
1144 
1145                 flags = ext4_xflags_to_iflags(fa.fsx_xflags);
1146                 if (ext4_mask_flags(inode->i_mode, flags) != flags)
1147                         return -EOPNOTSUPP;
1148 
1149                 err = mnt_want_write_file(filp);
1150                 if (err)
1151                         return err;
1152 
1153                 inode_lock(inode);
1154                 ext4_fill_fsxattr(inode, &old_fa);
1155                 err = vfs_ioc_fssetxattr_check(inode, &old_fa, &fa);
1156                 if (err)
1157                         goto out;
1158                 flags = (ei->i_flags & ~EXT4_FL_XFLAG_VISIBLE) |
1159                          (flags & EXT4_FL_XFLAG_VISIBLE);
1160                 err = ext4_ioctl_check_immutable(inode, fa.fsx_projid, flags);
1161                 if (err)
1162                         goto out;
1163                 err = ext4_ioctl_setflags(inode, flags);
1164                 if (err)
1165                         goto out;
1166                 err = ext4_ioctl_setproject(filp, fa.fsx_projid);
1167 out:
1168                 inode_unlock(inode);
1169                 mnt_drop_write_file(filp);
1170                 return err;
1171         }
1172         case EXT4_IOC_SHUTDOWN:
1173                 return ext4_shutdown(sb, arg);
1174         default:
1175                 return -ENOTTY;
1176         }
1177 }
1178 
1179 #ifdef CONFIG_COMPAT
1180 long ext4_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1181 {
1182         /* These are just misnamed, they actually get/put from/to user an int */
1183         switch (cmd) {
1184         case EXT4_IOC32_GETFLAGS:
1185                 cmd = EXT4_IOC_GETFLAGS;
1186                 break;
1187         case EXT4_IOC32_SETFLAGS:
1188                 cmd = EXT4_IOC_SETFLAGS;
1189                 break;
1190         case EXT4_IOC32_GETVERSION:
1191                 cmd = EXT4_IOC_GETVERSION;
1192                 break;
1193         case EXT4_IOC32_SETVERSION:
1194                 cmd = EXT4_IOC_SETVERSION;
1195                 break;
1196         case EXT4_IOC32_GROUP_EXTEND:
1197                 cmd = EXT4_IOC_GROUP_EXTEND;
1198                 break;
1199         case EXT4_IOC32_GETVERSION_OLD:
1200                 cmd = EXT4_IOC_GETVERSION_OLD;
1201                 break;
1202         case EXT4_IOC32_SETVERSION_OLD:
1203                 cmd = EXT4_IOC_SETVERSION_OLD;
1204                 break;
1205         case EXT4_IOC32_GETRSVSZ:
1206                 cmd = EXT4_IOC_GETRSVSZ;
1207                 break;
1208         case EXT4_IOC32_SETRSVSZ:
1209                 cmd = EXT4_IOC_SETRSVSZ;
1210                 break;
1211         case EXT4_IOC32_GROUP_ADD: {
1212                 struct compat_ext4_new_group_input __user *uinput;
1213                 struct ext4_new_group_data input;
1214                 int err;
1215 
1216                 uinput = compat_ptr(arg);
1217                 err = get_user(input.group, &uinput->group);
1218                 err |= get_user(input.block_bitmap, &uinput->block_bitmap);
1219                 err |= get_user(input.inode_bitmap, &uinput->inode_bitmap);
1220                 err |= get_user(input.inode_table, &uinput->inode_table);
1221                 err |= get_user(input.blocks_count, &uinput->blocks_count);
1222                 err |= get_user(input.reserved_blocks,
1223                                 &uinput->reserved_blocks);
1224                 if (err)
1225                         return -EFAULT;
1226                 return ext4_ioctl_group_add(file, &input);
1227         }
1228         case EXT4_IOC_MOVE_EXT:
1229         case EXT4_IOC_RESIZE_FS:
1230         case EXT4_IOC_PRECACHE_EXTENTS:
1231         case EXT4_IOC_SET_ENCRYPTION_POLICY:
1232         case EXT4_IOC_GET_ENCRYPTION_PWSALT:
1233         case EXT4_IOC_GET_ENCRYPTION_POLICY:
1234         case EXT4_IOC_SHUTDOWN:
1235         case FS_IOC_GETFSMAP:
1236                 break;
1237         default:
1238                 return -ENOIOCTLCMD;
1239         }
1240         return ext4_ioctl(file, cmd, (unsigned long) compat_ptr(arg));
1241 }
1242 #endif
1243 

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