2 * linux/fs/ext4/ioctl.c
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)
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 <asm/uaccess.h>
18 #include "ext4_jbd2.h"
21 #define MAX_32_NUM ((((unsigned long long) 1) << 32) - 1)
24 * Swap memory between @a and @b for @len bytes.
26 * @a: pointer to first memory area
27 * @b: pointer to second memory area
28 * @len: number of bytes to swap
31 static void memswap(void *a
, void *b
, size_t len
)
33 unsigned char *ap
, *bp
;
35 ap
= (unsigned char *)a
;
36 bp
= (unsigned char *)b
;
45 * Swap i_data and associated attributes between @inode1 and @inode2.
46 * This function is used for the primary swap between inode1 and inode2
47 * and also to revert this primary swap in case of errors.
49 * Therefore you have to make sure, that calling this method twice
50 * will revert all changes.
52 * @inode1: pointer to first inode
53 * @inode2: pointer to second inode
55 static void swap_inode_data(struct inode
*inode1
, struct inode
*inode2
)
58 struct ext4_inode_info
*ei1
;
59 struct ext4_inode_info
*ei2
;
64 memswap(&inode1
->i_flags
, &inode2
->i_flags
, sizeof(inode1
->i_flags
));
65 memswap(&inode1
->i_version
, &inode2
->i_version
,
66 sizeof(inode1
->i_version
));
67 memswap(&inode1
->i_blocks
, &inode2
->i_blocks
,
68 sizeof(inode1
->i_blocks
));
69 memswap(&inode1
->i_bytes
, &inode2
->i_bytes
, sizeof(inode1
->i_bytes
));
70 memswap(&inode1
->i_atime
, &inode2
->i_atime
, sizeof(inode1
->i_atime
));
71 memswap(&inode1
->i_mtime
, &inode2
->i_mtime
, sizeof(inode1
->i_mtime
));
73 memswap(ei1
->i_data
, ei2
->i_data
, sizeof(ei1
->i_data
));
74 memswap(&ei1
->i_flags
, &ei2
->i_flags
, sizeof(ei1
->i_flags
));
75 memswap(&ei1
->i_disksize
, &ei2
->i_disksize
, sizeof(ei1
->i_disksize
));
76 ext4_es_remove_extent(inode1
, 0, EXT_MAX_BLOCKS
);
77 ext4_es_remove_extent(inode2
, 0, EXT_MAX_BLOCKS
);
79 isize
= i_size_read(inode1
);
80 i_size_write(inode1
, i_size_read(inode2
));
81 i_size_write(inode2
, isize
);
85 * Swap the information from the given @inode and the inode
86 * EXT4_BOOT_LOADER_INO. It will basically swap i_data and all other
87 * important fields of the inodes.
89 * @sb: the super block of the filesystem
90 * @inode: the inode to swap with EXT4_BOOT_LOADER_INO
93 static long swap_inode_boot_loader(struct super_block
*sb
,
98 struct inode
*inode_bl
;
99 struct ext4_inode_info
*ei_bl
;
100 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
102 if (inode
->i_nlink
!= 1 || !S_ISREG(inode
->i_mode
))
105 if (!inode_owner_or_capable(inode
) || !capable(CAP_SYS_ADMIN
))
108 inode_bl
= ext4_iget(sb
, EXT4_BOOT_LOADER_INO
, EXT4_IGET_SPECIAL
);
109 if (IS_ERR(inode_bl
))
110 return PTR_ERR(inode_bl
);
111 ei_bl
= EXT4_I(inode_bl
);
113 filemap_flush(inode
->i_mapping
);
114 filemap_flush(inode_bl
->i_mapping
);
116 /* Protect orig inodes against a truncate and make sure,
117 * that only 1 swap_inode_boot_loader is running. */
118 lock_two_nondirectories(inode
, inode_bl
);
120 truncate_inode_pages(&inode
->i_data
, 0);
121 truncate_inode_pages(&inode_bl
->i_data
, 0);
123 /* Wait for all existing dio workers */
124 ext4_inode_block_unlocked_dio(inode
);
125 ext4_inode_block_unlocked_dio(inode_bl
);
126 inode_dio_wait(inode
);
127 inode_dio_wait(inode_bl
);
129 handle
= ext4_journal_start(inode_bl
, EXT4_HT_MOVE_EXTENTS
, 2);
130 if (IS_ERR(handle
)) {
132 goto journal_err_out
;
135 /* Protect extent tree against block allocations via delalloc */
136 ext4_double_down_write_data_sem(inode
, inode_bl
);
138 if (inode_bl
->i_nlink
== 0) {
139 /* this inode has never been used as a BOOT_LOADER */
140 set_nlink(inode_bl
, 1);
141 i_uid_write(inode_bl
, 0);
142 i_gid_write(inode_bl
, 0);
143 inode_bl
->i_flags
= 0;
145 inode_bl
->i_version
= 1;
146 i_size_write(inode_bl
, 0);
147 inode_bl
->i_mode
= S_IFREG
;
148 if (ext4_has_feature_extents(sb
)) {
149 ext4_set_inode_flag(inode_bl
, EXT4_INODE_EXTENTS
);
150 ext4_ext_tree_init(handle
, inode_bl
);
152 memset(ei_bl
->i_data
, 0, sizeof(ei_bl
->i_data
));
155 swap_inode_data(inode
, inode_bl
);
157 inode
->i_ctime
= inode_bl
->i_ctime
= ext4_current_time(inode
);
159 spin_lock(&sbi
->s_next_gen_lock
);
160 inode
->i_generation
= sbi
->s_next_generation
++;
161 inode_bl
->i_generation
= sbi
->s_next_generation
++;
162 spin_unlock(&sbi
->s_next_gen_lock
);
164 ext4_discard_preallocations(inode
);
166 err
= ext4_mark_inode_dirty(handle
, inode
);
168 ext4_warning(inode
->i_sb
,
169 "couldn't mark inode #%lu dirty (err %d)",
171 /* Revert all changes: */
172 swap_inode_data(inode
, inode_bl
);
174 err
= ext4_mark_inode_dirty(handle
, inode_bl
);
176 ext4_warning(inode_bl
->i_sb
,
177 "couldn't mark inode #%lu dirty (err %d)",
178 inode_bl
->i_ino
, err
);
179 /* Revert all changes: */
180 swap_inode_data(inode
, inode_bl
);
181 ext4_mark_inode_dirty(handle
, inode
);
184 ext4_journal_stop(handle
);
185 ext4_double_up_write_data_sem(inode
, inode_bl
);
188 ext4_inode_resume_unlocked_dio(inode
);
189 ext4_inode_resume_unlocked_dio(inode_bl
);
190 unlock_two_nondirectories(inode
, inode_bl
);
195 static int uuid_is_zero(__u8 u
[16])
199 for (i
= 0; i
< 16; i
++)
205 long ext4_ioctl(struct file
*filp
, unsigned int cmd
, unsigned long arg
)
207 struct inode
*inode
= file_inode(filp
);
208 struct super_block
*sb
= inode
->i_sb
;
209 struct ext4_inode_info
*ei
= EXT4_I(inode
);
212 ext4_debug("cmd = %u, arg = %lu\n", cmd
, arg
);
215 case EXT4_IOC_GETFLAGS
:
216 ext4_get_inode_flags(ei
);
217 flags
= ei
->i_flags
& EXT4_FL_USER_VISIBLE
;
218 return put_user(flags
, (int __user
*) arg
);
219 case EXT4_IOC_SETFLAGS
: {
220 handle_t
*handle
= NULL
;
221 int err
, migrate
= 0;
222 struct ext4_iloc iloc
;
223 unsigned int oldflags
, mask
, i
;
226 if (!inode_owner_or_capable(inode
))
229 if (get_user(flags
, (int __user
*) arg
))
232 err
= mnt_want_write_file(filp
);
236 flags
= ext4_mask_flags(inode
->i_mode
, flags
);
239 mutex_lock(&inode
->i_mutex
);
240 /* Is it quota file? Do not allow user to mess with it */
241 if (IS_NOQUOTA(inode
))
244 oldflags
= ei
->i_flags
;
246 /* The JOURNAL_DATA flag is modifiable only by root */
247 jflag
= flags
& EXT4_JOURNAL_DATA_FL
;
250 * The IMMUTABLE and APPEND_ONLY flags can only be changed by
251 * the relevant capability.
253 * This test looks nicer. Thanks to Pauline Middelink
255 if ((flags
^ oldflags
) & (EXT4_APPEND_FL
| EXT4_IMMUTABLE_FL
)) {
256 if (!capable(CAP_LINUX_IMMUTABLE
))
261 * The JOURNAL_DATA flag can only be changed by
262 * the relevant capability.
264 if ((jflag
^ oldflags
) & (EXT4_JOURNAL_DATA_FL
)) {
265 if (!capable(CAP_SYS_RESOURCE
))
268 if ((flags
^ oldflags
) & EXT4_EXTENTS_FL
)
271 if (flags
& EXT4_EOFBLOCKS_FL
) {
272 /* we don't support adding EOFBLOCKS flag */
273 if (!(oldflags
& EXT4_EOFBLOCKS_FL
)) {
277 } else if (oldflags
& EXT4_EOFBLOCKS_FL
)
278 ext4_truncate(inode
);
280 handle
= ext4_journal_start(inode
, EXT4_HT_INODE
, 1);
281 if (IS_ERR(handle
)) {
282 err
= PTR_ERR(handle
);
286 ext4_handle_sync(handle
);
287 err
= ext4_reserve_inode_write(handle
, inode
, &iloc
);
291 for (i
= 0, mask
= 1; i
< 32; i
++, mask
<<= 1) {
292 if (!(mask
& EXT4_FL_USER_MODIFIABLE
))
295 ext4_set_inode_flag(inode
, i
);
297 ext4_clear_inode_flag(inode
, i
);
300 ext4_set_inode_flags(inode
);
301 inode
->i_ctime
= ext4_current_time(inode
);
303 err
= ext4_mark_iloc_dirty(handle
, inode
, &iloc
);
305 ext4_journal_stop(handle
);
309 if ((jflag
^ oldflags
) & (EXT4_JOURNAL_DATA_FL
))
310 err
= ext4_change_inode_journal_flag(inode
, jflag
);
314 if (flags
& EXT4_EXTENTS_FL
)
315 err
= ext4_ext_migrate(inode
);
317 err
= ext4_ind_migrate(inode
);
321 mutex_unlock(&inode
->i_mutex
);
322 mnt_drop_write_file(filp
);
325 case EXT4_IOC_GETVERSION
:
326 case EXT4_IOC_GETVERSION_OLD
:
327 return put_user(inode
->i_generation
, (int __user
*) arg
);
328 case EXT4_IOC_SETVERSION
:
329 case EXT4_IOC_SETVERSION_OLD
: {
331 struct ext4_iloc iloc
;
335 if (!inode_owner_or_capable(inode
))
338 if (ext4_has_metadata_csum(inode
->i_sb
)) {
339 ext4_warning(sb
, "Setting inode version is not "
340 "supported with metadata_csum enabled.");
344 err
= mnt_want_write_file(filp
);
347 if (get_user(generation
, (int __user
*) arg
)) {
352 mutex_lock(&inode
->i_mutex
);
353 handle
= ext4_journal_start(inode
, EXT4_HT_INODE
, 1);
354 if (IS_ERR(handle
)) {
355 err
= PTR_ERR(handle
);
358 err
= ext4_reserve_inode_write(handle
, inode
, &iloc
);
360 inode
->i_ctime
= ext4_current_time(inode
);
361 inode
->i_generation
= generation
;
362 err
= ext4_mark_iloc_dirty(handle
, inode
, &iloc
);
364 ext4_journal_stop(handle
);
367 mutex_unlock(&inode
->i_mutex
);
369 mnt_drop_write_file(filp
);
372 case EXT4_IOC_GROUP_EXTEND
: {
373 ext4_fsblk_t n_blocks_count
;
376 err
= ext4_resize_begin(sb
);
380 if (get_user(n_blocks_count
, (__u32 __user
*)arg
)) {
382 goto group_extend_out
;
385 if (ext4_has_feature_bigalloc(sb
)) {
386 ext4_msg(sb
, KERN_ERR
,
387 "Online resizing not supported with bigalloc");
389 goto group_extend_out
;
392 err
= mnt_want_write_file(filp
);
394 goto group_extend_out
;
396 err
= ext4_group_extend(sb
, EXT4_SB(sb
)->s_es
, 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
);
404 mnt_drop_write_file(filp
);
410 case EXT4_IOC_MOVE_EXT
: {
411 struct move_extent me
;
415 if (!(filp
->f_mode
& FMODE_READ
) ||
416 !(filp
->f_mode
& FMODE_WRITE
))
419 if (copy_from_user(&me
,
420 (struct move_extent __user
*)arg
, sizeof(me
)))
424 donor
= fdget(me
.donor_fd
);
428 if (!(donor
.file
->f_mode
& FMODE_WRITE
)) {
433 if (ext4_has_feature_bigalloc(sb
)) {
434 ext4_msg(sb
, KERN_ERR
,
435 "Online defrag not supported with bigalloc");
440 err
= mnt_want_write_file(filp
);
444 err
= ext4_move_extents(filp
, donor
.file
, me
.orig_start
,
445 me
.donor_start
, me
.len
, &me
.moved_len
);
446 mnt_drop_write_file(filp
);
448 if (copy_to_user((struct move_extent __user
*)arg
,
456 case EXT4_IOC_GROUP_ADD
: {
457 struct ext4_new_group_data input
;
460 err
= ext4_resize_begin(sb
);
464 if (copy_from_user(&input
, (struct ext4_new_group_input __user
*)arg
,
470 if (ext4_has_feature_bigalloc(sb
)) {
471 ext4_msg(sb
, KERN_ERR
,
472 "Online resizing not supported with bigalloc");
477 err
= mnt_want_write_file(filp
);
481 err
= ext4_group_add(sb
, &input
);
482 if (EXT4_SB(sb
)->s_journal
) {
483 jbd2_journal_lock_updates(EXT4_SB(sb
)->s_journal
);
484 err2
= jbd2_journal_flush(EXT4_SB(sb
)->s_journal
);
485 jbd2_journal_unlock_updates(EXT4_SB(sb
)->s_journal
);
489 mnt_drop_write_file(filp
);
490 if (!err
&& ext4_has_group_desc_csum(sb
) &&
491 test_opt(sb
, INIT_INODE_TABLE
))
492 err
= ext4_register_li_request(sb
, input
.group
);
498 case EXT4_IOC_MIGRATE
:
501 if (!inode_owner_or_capable(inode
))
504 err
= mnt_want_write_file(filp
);
508 * inode_mutex prevent write and truncate on the file.
509 * Read still goes through. We take i_data_sem in
510 * ext4_ext_swap_inode_data before we switch the
511 * inode format to prevent read.
513 mutex_lock(&(inode
->i_mutex
));
514 err
= ext4_ext_migrate(inode
);
515 mutex_unlock(&(inode
->i_mutex
));
516 mnt_drop_write_file(filp
);
520 case EXT4_IOC_ALLOC_DA_BLKS
:
523 if (!inode_owner_or_capable(inode
))
526 err
= mnt_want_write_file(filp
);
529 err
= ext4_alloc_da_blocks(inode
);
530 mnt_drop_write_file(filp
);
534 case EXT4_IOC_SWAP_BOOT
:
537 if (!(filp
->f_mode
& FMODE_WRITE
))
539 err
= mnt_want_write_file(filp
);
542 err
= swap_inode_boot_loader(sb
, inode
);
543 mnt_drop_write_file(filp
);
547 case EXT4_IOC_RESIZE_FS
: {
548 ext4_fsblk_t n_blocks_count
;
549 int err
= 0, err2
= 0;
550 ext4_group_t o_group
= EXT4_SB(sb
)->s_groups_count
;
552 if (ext4_has_feature_bigalloc(sb
)) {
553 ext4_msg(sb
, KERN_ERR
,
554 "Online resizing not (yet) supported with bigalloc");
558 if (copy_from_user(&n_blocks_count
, (__u64 __user
*)arg
,
563 err
= ext4_resize_begin(sb
);
567 err
= mnt_want_write_file(filp
);
571 err
= ext4_resize_fs(sb
, n_blocks_count
);
572 if (EXT4_SB(sb
)->s_journal
) {
573 jbd2_journal_lock_updates(EXT4_SB(sb
)->s_journal
);
574 err2
= jbd2_journal_flush(EXT4_SB(sb
)->s_journal
);
575 jbd2_journal_unlock_updates(EXT4_SB(sb
)->s_journal
);
579 mnt_drop_write_file(filp
);
580 if (!err
&& (o_group
< EXT4_SB(sb
)->s_groups_count
) &&
581 ext4_has_group_desc_csum(sb
) &&
582 test_opt(sb
, INIT_INODE_TABLE
))
583 err
= ext4_register_li_request(sb
, o_group
);
592 struct request_queue
*q
= bdev_get_queue(sb
->s_bdev
);
593 struct fstrim_range range
;
596 if (!capable(CAP_SYS_ADMIN
))
599 if (!blk_queue_discard(q
))
603 * We haven't replayed the journal, so we cannot use our
604 * block-bitmap-guided storage zapping commands.
606 if (test_opt(sb
, NOLOAD
) && ext4_has_feature_journal(sb
))
609 if (copy_from_user(&range
, (struct fstrim_range __user
*)arg
,
613 range
.minlen
= max((unsigned int)range
.minlen
,
614 q
->limits
.discard_granularity
);
615 ret
= ext4_trim_fs(sb
, &range
);
619 if (copy_to_user((struct fstrim_range __user
*)arg
, &range
,
625 case EXT4_IOC_PRECACHE_EXTENTS
:
626 return ext4_ext_precache(inode
);
627 case EXT4_IOC_SET_ENCRYPTION_POLICY
: {
628 #ifdef CONFIG_EXT4_FS_ENCRYPTION
629 struct ext4_encryption_policy policy
;
632 if (!ext4_has_feature_encrypt(sb
))
635 if (copy_from_user(&policy
,
636 (struct ext4_encryption_policy __user
*)arg
,
639 goto encryption_policy_out
;
642 err
= mnt_want_write_file(filp
);
644 goto encryption_policy_out
;
646 mutex_lock(&inode
->i_mutex
);
648 err
= ext4_process_policy(&policy
, inode
);
650 mutex_unlock(&inode
->i_mutex
);
652 mnt_drop_write_file(filp
);
653 encryption_policy_out
:
659 case EXT4_IOC_GET_ENCRYPTION_PWSALT
: {
661 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
664 if (!ext4_sb_has_crypto(sb
))
666 if (uuid_is_zero(sbi
->s_es
->s_encrypt_pw_salt
)) {
667 err
= mnt_want_write_file(filp
);
670 handle
= ext4_journal_start_sb(sb
, EXT4_HT_MISC
, 1);
671 if (IS_ERR(handle
)) {
672 err
= PTR_ERR(handle
);
673 goto pwsalt_err_exit
;
675 err
= ext4_journal_get_write_access(handle
, sbi
->s_sbh
);
677 goto pwsalt_err_journal
;
678 generate_random_uuid(sbi
->s_es
->s_encrypt_pw_salt
);
679 err
= ext4_handle_dirty_metadata(handle
, NULL
,
682 err2
= ext4_journal_stop(handle
);
686 mnt_drop_write_file(filp
);
690 if (copy_to_user((void __user
*) arg
,
691 sbi
->s_es
->s_encrypt_pw_salt
, 16))
695 case EXT4_IOC_GET_ENCRYPTION_POLICY
: {
696 #ifdef CONFIG_EXT4_FS_ENCRYPTION
697 struct ext4_encryption_policy policy
;
700 if (!ext4_encrypted_inode(inode
))
702 err
= ext4_get_policy(inode
, &policy
);
705 if (copy_to_user((void __user
*)arg
, &policy
, sizeof(policy
)))
718 long ext4_compat_ioctl(struct file
*file
, unsigned int cmd
, unsigned long arg
)
720 /* These are just misnamed, they actually get/put from/to user an int */
722 case EXT4_IOC32_GETFLAGS
:
723 cmd
= EXT4_IOC_GETFLAGS
;
725 case EXT4_IOC32_SETFLAGS
:
726 cmd
= EXT4_IOC_SETFLAGS
;
728 case EXT4_IOC32_GETVERSION
:
729 cmd
= EXT4_IOC_GETVERSION
;
731 case EXT4_IOC32_SETVERSION
:
732 cmd
= EXT4_IOC_SETVERSION
;
734 case EXT4_IOC32_GROUP_EXTEND
:
735 cmd
= EXT4_IOC_GROUP_EXTEND
;
737 case EXT4_IOC32_GETVERSION_OLD
:
738 cmd
= EXT4_IOC_GETVERSION_OLD
;
740 case EXT4_IOC32_SETVERSION_OLD
:
741 cmd
= EXT4_IOC_SETVERSION_OLD
;
743 case EXT4_IOC32_GETRSVSZ
:
744 cmd
= EXT4_IOC_GETRSVSZ
;
746 case EXT4_IOC32_SETRSVSZ
:
747 cmd
= EXT4_IOC_SETRSVSZ
;
749 case EXT4_IOC32_GROUP_ADD
: {
750 struct compat_ext4_new_group_input __user
*uinput
;
751 struct ext4_new_group_input input
;
755 uinput
= compat_ptr(arg
);
756 err
= get_user(input
.group
, &uinput
->group
);
757 err
|= get_user(input
.block_bitmap
, &uinput
->block_bitmap
);
758 err
|= get_user(input
.inode_bitmap
, &uinput
->inode_bitmap
);
759 err
|= get_user(input
.inode_table
, &uinput
->inode_table
);
760 err
|= get_user(input
.blocks_count
, &uinput
->blocks_count
);
761 err
|= get_user(input
.reserved_blocks
,
762 &uinput
->reserved_blocks
);
767 err
= ext4_ioctl(file
, EXT4_IOC_GROUP_ADD
,
768 (unsigned long) &input
);
772 case EXT4_IOC_MOVE_EXT
:
773 case EXT4_IOC_RESIZE_FS
:
774 case EXT4_IOC_PRECACHE_EXTENTS
:
775 case EXT4_IOC_SET_ENCRYPTION_POLICY
:
776 case EXT4_IOC_GET_ENCRYPTION_PWSALT
:
777 case EXT4_IOC_GET_ENCRYPTION_POLICY
:
782 return ext4_ioctl(file
, cmd
, (unsigned long) compat_ptr(arg
));