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/jbd2.h>
12 #include <linux/capability.h>
13 #include <linux/time.h>
14 #include <linux/compat.h>
15 #include <linux/mount.h>
16 #include <linux/file.h>
17 #include <asm/uaccess.h>
18 #include "ext4_jbd2.h"
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;
36 ap = (unsigned char *)a;
37 bp = (unsigned char *)b;
48 * Swap i_data and associated attributes between @inode1 and @inode2.
49 * This function is used for the primary swap between inode1 and inode2
50 * and also to revert this primary swap in case of errors.
52 * Therefore you have to make sure, that calling this method twice
53 * will revert all changes.
55 * @inode1: pointer to first inode
56 * @inode2: pointer to second inode
58 static void swap_inode_data(struct inode *inode1, struct inode *inode2)
61 struct ext4_inode_info *ei1;
62 struct ext4_inode_info *ei2;
67 memswap(&inode1->i_flags, &inode2->i_flags, sizeof(inode1->i_flags));
68 memswap(&inode1->i_version, &inode2->i_version,
69 sizeof(inode1->i_version));
70 memswap(&inode1->i_blocks, &inode2->i_blocks,
71 sizeof(inode1->i_blocks));
72 memswap(&inode1->i_bytes, &inode2->i_bytes, sizeof(inode1->i_bytes));
73 memswap(&inode1->i_atime, &inode2->i_atime, sizeof(inode1->i_atime));
74 memswap(&inode1->i_mtime, &inode2->i_mtime, sizeof(inode1->i_mtime));
76 memswap(ei1->i_data, ei2->i_data, sizeof(ei1->i_data));
77 memswap(&ei1->i_flags, &ei2->i_flags, sizeof(ei1->i_flags));
78 memswap(&ei1->i_disksize, &ei2->i_disksize, sizeof(ei1->i_disksize));
79 ext4_es_remove_extent(inode1, 0, EXT_MAX_BLOCKS);
80 ext4_es_remove_extent(inode2, 0, EXT_MAX_BLOCKS);
81 ext4_es_lru_del(inode1);
82 ext4_es_lru_del(inode2);
84 isize = i_size_read(inode1);
85 i_size_write(inode1, i_size_read(inode2));
86 i_size_write(inode2, isize);
90 * Swap the information from the given @inode and the inode
91 * EXT4_BOOT_LOADER_INO. It will basically swap i_data and all other
92 * important fields of the inodes.
94 * @sb: the super block of the filesystem
95 * @inode: the inode to swap with EXT4_BOOT_LOADER_INO
98 static long swap_inode_boot_loader(struct super_block *sb,
103 struct inode *inode_bl;
104 struct ext4_inode_info *ei_bl;
105 struct ext4_sb_info *sbi = EXT4_SB(sb);
107 if (inode->i_nlink != 1 || !S_ISREG(inode->i_mode))
110 if (!inode_owner_or_capable(inode) || !capable(CAP_SYS_ADMIN))
113 inode_bl = ext4_iget(sb, EXT4_BOOT_LOADER_INO);
114 if (IS_ERR(inode_bl))
115 return PTR_ERR(inode_bl);
116 ei_bl = EXT4_I(inode_bl);
118 filemap_flush(inode->i_mapping);
119 filemap_flush(inode_bl->i_mapping);
121 /* Protect orig inodes against a truncate and make sure,
122 * that only 1 swap_inode_boot_loader is running. */
123 lock_two_nondirectories(inode, inode_bl);
125 truncate_inode_pages(&inode->i_data, 0);
126 truncate_inode_pages(&inode_bl->i_data, 0);
128 /* Wait for all existing dio workers */
129 ext4_inode_block_unlocked_dio(inode);
130 ext4_inode_block_unlocked_dio(inode_bl);
131 inode_dio_wait(inode);
132 inode_dio_wait(inode_bl);
134 handle = ext4_journal_start(inode_bl, EXT4_HT_MOVE_EXTENTS, 2);
135 if (IS_ERR(handle)) {
137 goto journal_err_out;
140 /* Protect extent tree against block allocations via delalloc */
141 ext4_double_down_write_data_sem(inode, inode_bl);
143 if (inode_bl->i_nlink == 0) {
144 /* this inode has never been used as a BOOT_LOADER */
145 set_nlink(inode_bl, 1);
146 i_uid_write(inode_bl, 0);
147 i_gid_write(inode_bl, 0);
148 inode_bl->i_flags = 0;
150 inode_bl->i_version = 1;
151 i_size_write(inode_bl, 0);
152 inode_bl->i_mode = S_IFREG;
153 if (EXT4_HAS_INCOMPAT_FEATURE(sb,
154 EXT4_FEATURE_INCOMPAT_EXTENTS)) {
155 ext4_set_inode_flag(inode_bl, EXT4_INODE_EXTENTS);
156 ext4_ext_tree_init(handle, inode_bl);
158 memset(ei_bl->i_data, 0, sizeof(ei_bl->i_data));
161 swap_inode_data(inode, inode_bl);
163 inode->i_ctime = inode_bl->i_ctime = ext4_current_time(inode);
165 spin_lock(&sbi->s_next_gen_lock);
166 inode->i_generation = sbi->s_next_generation++;
167 inode_bl->i_generation = sbi->s_next_generation++;
168 spin_unlock(&sbi->s_next_gen_lock);
170 ext4_discard_preallocations(inode);
172 err = ext4_mark_inode_dirty(handle, inode);
174 ext4_warning(inode->i_sb,
175 "couldn't mark inode #%lu dirty (err %d)",
177 /* Revert all changes: */
178 swap_inode_data(inode, inode_bl);
180 err = ext4_mark_inode_dirty(handle, inode_bl);
182 ext4_warning(inode_bl->i_sb,
183 "couldn't mark inode #%lu dirty (err %d)",
184 inode_bl->i_ino, err);
185 /* Revert all changes: */
186 swap_inode_data(inode, inode_bl);
187 ext4_mark_inode_dirty(handle, inode);
190 ext4_journal_stop(handle);
191 ext4_double_up_write_data_sem(inode, inode_bl);
194 ext4_inode_resume_unlocked_dio(inode);
195 ext4_inode_resume_unlocked_dio(inode_bl);
196 unlock_two_nondirectories(inode, inode_bl);
201 long ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
203 struct inode *inode = file_inode(filp);
204 struct super_block *sb = inode->i_sb;
205 struct ext4_inode_info *ei = EXT4_I(inode);
208 ext4_debug("cmd = %u, arg = %lu\n", cmd, arg);
211 case EXT4_IOC_GETFLAGS:
212 ext4_get_inode_flags(ei);
213 flags = ei->i_flags & EXT4_FL_USER_VISIBLE;
214 return put_user(flags, (int __user *) arg);
215 case EXT4_IOC_SETFLAGS: {
216 handle_t *handle = NULL;
217 int err, migrate = 0;
218 struct ext4_iloc iloc;
219 unsigned int oldflags, mask, i;
222 if (!inode_owner_or_capable(inode))
225 if (get_user(flags, (int __user *) arg))
228 err = mnt_want_write_file(filp);
232 flags = ext4_mask_flags(inode->i_mode, flags);
235 mutex_lock(&inode->i_mutex);
236 /* Is it quota file? Do not allow user to mess with it */
237 if (IS_NOQUOTA(inode))
240 oldflags = ei->i_flags;
242 /* The JOURNAL_DATA flag is modifiable only by root */
243 jflag = flags & EXT4_JOURNAL_DATA_FL;
246 * The IMMUTABLE and APPEND_ONLY flags can only be changed by
247 * the relevant capability.
249 * This test looks nicer. Thanks to Pauline Middelink
251 if ((flags ^ oldflags) & (EXT4_APPEND_FL | EXT4_IMMUTABLE_FL)) {
252 if (!capable(CAP_LINUX_IMMUTABLE))
257 * The JOURNAL_DATA flag can only be changed by
258 * the relevant capability.
260 if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL)) {
261 if (!capable(CAP_SYS_RESOURCE))
264 if ((flags ^ oldflags) & EXT4_EXTENTS_FL)
267 if (flags & EXT4_EOFBLOCKS_FL) {
268 /* we don't support adding EOFBLOCKS flag */
269 if (!(oldflags & EXT4_EOFBLOCKS_FL)) {
273 } else if (oldflags & EXT4_EOFBLOCKS_FL)
274 ext4_truncate(inode);
276 handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
277 if (IS_ERR(handle)) {
278 err = PTR_ERR(handle);
282 ext4_handle_sync(handle);
283 err = ext4_reserve_inode_write(handle, inode, &iloc);
287 for (i = 0, mask = 1; i < 32; i++, mask <<= 1) {
288 if (!(mask & EXT4_FL_USER_MODIFIABLE))
291 ext4_set_inode_flag(inode, i);
293 ext4_clear_inode_flag(inode, i);
296 ext4_set_inode_flags(inode);
297 inode->i_ctime = ext4_current_time(inode);
299 err = ext4_mark_iloc_dirty(handle, inode, &iloc);
301 ext4_journal_stop(handle);
305 if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL))
306 err = ext4_change_inode_journal_flag(inode, jflag);
310 if (flags & EXT4_EXTENTS_FL)
311 err = ext4_ext_migrate(inode);
313 err = ext4_ind_migrate(inode);
317 mutex_unlock(&inode->i_mutex);
318 mnt_drop_write_file(filp);
321 case EXT4_IOC_GETVERSION:
322 case EXT4_IOC_GETVERSION_OLD:
323 return put_user(inode->i_generation, (int __user *) arg);
324 case EXT4_IOC_SETVERSION:
325 case EXT4_IOC_SETVERSION_OLD: {
327 struct ext4_iloc iloc;
331 if (!inode_owner_or_capable(inode))
334 if (ext4_has_metadata_csum(inode->i_sb)) {
335 ext4_warning(sb, "Setting inode version is not "
336 "supported with metadata_csum enabled.");
340 err = mnt_want_write_file(filp);
343 if (get_user(generation, (int __user *) arg)) {
348 mutex_lock(&inode->i_mutex);
349 handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
350 if (IS_ERR(handle)) {
351 err = PTR_ERR(handle);
354 err = ext4_reserve_inode_write(handle, inode, &iloc);
356 inode->i_ctime = ext4_current_time(inode);
357 inode->i_generation = generation;
358 err = ext4_mark_iloc_dirty(handle, inode, &iloc);
360 ext4_journal_stop(handle);
363 mutex_unlock(&inode->i_mutex);
365 mnt_drop_write_file(filp);
368 case EXT4_IOC_GROUP_EXTEND: {
369 ext4_fsblk_t n_blocks_count;
372 err = ext4_resize_begin(sb);
376 if (get_user(n_blocks_count, (__u32 __user *)arg)) {
378 goto group_extend_out;
381 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
382 EXT4_FEATURE_RO_COMPAT_BIGALLOC)) {
383 ext4_msg(sb, KERN_ERR,
384 "Online resizing not supported with bigalloc");
386 goto group_extend_out;
389 err = mnt_want_write_file(filp);
391 goto group_extend_out;
393 err = ext4_group_extend(sb, EXT4_SB(sb)->s_es, n_blocks_count);
394 if (EXT4_SB(sb)->s_journal) {
395 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
396 err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
397 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
401 mnt_drop_write_file(filp);
407 case EXT4_IOC_MOVE_EXT: {
408 struct move_extent me;
412 if (!(filp->f_mode & FMODE_READ) ||
413 !(filp->f_mode & FMODE_WRITE))
416 if (copy_from_user(&me,
417 (struct move_extent __user *)arg, sizeof(me)))
421 donor = fdget(me.donor_fd);
425 if (!(donor.file->f_mode & FMODE_WRITE)) {
430 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
431 EXT4_FEATURE_RO_COMPAT_BIGALLOC)) {
432 ext4_msg(sb, KERN_ERR,
433 "Online defrag not supported with bigalloc");
438 err = mnt_want_write_file(filp);
442 err = ext4_move_extents(filp, donor.file, me.orig_start,
443 me.donor_start, me.len, &me.moved_len);
444 mnt_drop_write_file(filp);
446 if (copy_to_user((struct move_extent __user *)arg,
454 case EXT4_IOC_GROUP_ADD: {
455 struct ext4_new_group_data input;
458 err = ext4_resize_begin(sb);
462 if (copy_from_user(&input, (struct ext4_new_group_input __user *)arg,
468 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
469 EXT4_FEATURE_RO_COMPAT_BIGALLOC)) {
470 ext4_msg(sb, KERN_ERR,
471 "Online resizing not supported with bigalloc");
476 err = mnt_want_write_file(filp);
480 err = ext4_group_add(sb, &input);
481 if (EXT4_SB(sb)->s_journal) {
482 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
483 err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
484 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
488 mnt_drop_write_file(filp);
489 if (!err && ext4_has_group_desc_csum(sb) &&
490 test_opt(sb, INIT_INODE_TABLE))
491 err = ext4_register_li_request(sb, input.group);
497 case EXT4_IOC_MIGRATE:
500 if (!inode_owner_or_capable(inode))
503 err = mnt_want_write_file(filp);
507 * inode_mutex prevent write and truncate on the file.
508 * Read still goes through. We take i_data_sem in
509 * ext4_ext_swap_inode_data before we switch the
510 * inode format to prevent read.
512 mutex_lock(&(inode->i_mutex));
513 err = ext4_ext_migrate(inode);
514 mutex_unlock(&(inode->i_mutex));
515 mnt_drop_write_file(filp);
519 case EXT4_IOC_ALLOC_DA_BLKS:
522 if (!inode_owner_or_capable(inode))
525 err = mnt_want_write_file(filp);
528 err = ext4_alloc_da_blocks(inode);
529 mnt_drop_write_file(filp);
533 case EXT4_IOC_SWAP_BOOT:
536 if (!(filp->f_mode & FMODE_WRITE))
538 err = mnt_want_write_file(filp);
541 err = swap_inode_boot_loader(sb, inode);
542 mnt_drop_write_file(filp);
546 case EXT4_IOC_RESIZE_FS: {
547 ext4_fsblk_t n_blocks_count;
548 int err = 0, err2 = 0;
549 ext4_group_t o_group = EXT4_SB(sb)->s_groups_count;
551 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
552 EXT4_FEATURE_RO_COMPAT_BIGALLOC)) {
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))
602 if (copy_from_user(&range, (struct fstrim_range __user *)arg,
606 range.minlen = max((unsigned int)range.minlen,
607 q->limits.discard_granularity);
608 ret = ext4_trim_fs(sb, &range);
612 if (copy_to_user((struct fstrim_range __user *)arg, &range,
618 case EXT4_IOC_PRECACHE_EXTENTS:
619 return ext4_ext_precache(inode);
627 long ext4_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
629 /* These are just misnamed, they actually get/put from/to user an int */
631 case EXT4_IOC32_GETFLAGS:
632 cmd = EXT4_IOC_GETFLAGS;
634 case EXT4_IOC32_SETFLAGS:
635 cmd = EXT4_IOC_SETFLAGS;
637 case EXT4_IOC32_GETVERSION:
638 cmd = EXT4_IOC_GETVERSION;
640 case EXT4_IOC32_SETVERSION:
641 cmd = EXT4_IOC_SETVERSION;
643 case EXT4_IOC32_GROUP_EXTEND:
644 cmd = EXT4_IOC_GROUP_EXTEND;
646 case EXT4_IOC32_GETVERSION_OLD:
647 cmd = EXT4_IOC_GETVERSION_OLD;
649 case EXT4_IOC32_SETVERSION_OLD:
650 cmd = EXT4_IOC_SETVERSION_OLD;
652 case EXT4_IOC32_GETRSVSZ:
653 cmd = EXT4_IOC_GETRSVSZ;
655 case EXT4_IOC32_SETRSVSZ:
656 cmd = EXT4_IOC_SETRSVSZ;
658 case EXT4_IOC32_GROUP_ADD: {
659 struct compat_ext4_new_group_input __user *uinput;
660 struct ext4_new_group_input input;
664 uinput = compat_ptr(arg);
665 err = get_user(input.group, &uinput->group);
666 err |= get_user(input.block_bitmap, &uinput->block_bitmap);
667 err |= get_user(input.inode_bitmap, &uinput->inode_bitmap);
668 err |= get_user(input.inode_table, &uinput->inode_table);
669 err |= get_user(input.blocks_count, &uinput->blocks_count);
670 err |= get_user(input.reserved_blocks,
671 &uinput->reserved_blocks);
676 err = ext4_ioctl(file, EXT4_IOC_GROUP_ADD,
677 (unsigned long) &input);
681 case EXT4_IOC_MOVE_EXT:
683 case EXT4_IOC_RESIZE_FS:
684 case EXT4_IOC_PRECACHE_EXTENTS:
689 return ext4_ioctl(file, cmd, (unsigned long) compat_ptr(arg));