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)) {
112 if (!inode_owner_or_capable(inode) || !capable(CAP_SYS_ADMIN)) {
117 inode_bl = ext4_iget(sb, EXT4_BOOT_LOADER_INO);
118 if (IS_ERR(inode_bl)) {
119 err = PTR_ERR(inode_bl);
122 ei_bl = EXT4_I(inode_bl);
124 filemap_flush(inode->i_mapping);
125 filemap_flush(inode_bl->i_mapping);
127 /* Protect orig inodes against a truncate and make sure,
128 * that only 1 swap_inode_boot_loader is running. */
129 lock_two_nondirectories(inode, inode_bl);
131 truncate_inode_pages(&inode->i_data, 0);
132 truncate_inode_pages(&inode_bl->i_data, 0);
134 /* Wait for all existing dio workers */
135 ext4_inode_block_unlocked_dio(inode);
136 ext4_inode_block_unlocked_dio(inode_bl);
137 inode_dio_wait(inode);
138 inode_dio_wait(inode_bl);
140 handle = ext4_journal_start(inode_bl, EXT4_HT_MOVE_EXTENTS, 2);
141 if (IS_ERR(handle)) {
146 /* Protect extent tree against block allocations via delalloc */
147 ext4_double_down_write_data_sem(inode, inode_bl);
149 if (inode_bl->i_nlink == 0) {
150 /* this inode has never been used as a BOOT_LOADER */
151 set_nlink(inode_bl, 1);
152 i_uid_write(inode_bl, 0);
153 i_gid_write(inode_bl, 0);
154 inode_bl->i_flags = 0;
156 inode_bl->i_version = 1;
157 i_size_write(inode_bl, 0);
158 inode_bl->i_mode = S_IFREG;
159 if (EXT4_HAS_INCOMPAT_FEATURE(sb,
160 EXT4_FEATURE_INCOMPAT_EXTENTS)) {
161 ext4_set_inode_flag(inode_bl, EXT4_INODE_EXTENTS);
162 ext4_ext_tree_init(handle, inode_bl);
164 memset(ei_bl->i_data, 0, sizeof(ei_bl->i_data));
167 swap_inode_data(inode, inode_bl);
169 inode->i_ctime = inode_bl->i_ctime = ext4_current_time(inode);
171 spin_lock(&sbi->s_next_gen_lock);
172 inode->i_generation = sbi->s_next_generation++;
173 inode_bl->i_generation = sbi->s_next_generation++;
174 spin_unlock(&sbi->s_next_gen_lock);
176 ext4_discard_preallocations(inode);
178 err = ext4_mark_inode_dirty(handle, inode);
180 ext4_warning(inode->i_sb,
181 "couldn't mark inode #%lu dirty (err %d)",
183 /* Revert all changes: */
184 swap_inode_data(inode, inode_bl);
186 err = ext4_mark_inode_dirty(handle, inode_bl);
188 ext4_warning(inode_bl->i_sb,
189 "couldn't mark inode #%lu dirty (err %d)",
190 inode_bl->i_ino, err);
191 /* Revert all changes: */
192 swap_inode_data(inode, inode_bl);
193 ext4_mark_inode_dirty(handle, inode);
197 ext4_journal_stop(handle);
199 ext4_double_up_write_data_sem(inode, inode_bl);
201 ext4_inode_resume_unlocked_dio(inode);
202 ext4_inode_resume_unlocked_dio(inode_bl);
204 unlock_two_nondirectories(inode, inode_bl);
212 long ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
214 struct inode *inode = file_inode(filp);
215 struct super_block *sb = inode->i_sb;
216 struct ext4_inode_info *ei = EXT4_I(inode);
219 ext4_debug("cmd = %u, arg = %lu\n", cmd, arg);
222 case EXT4_IOC_GETFLAGS:
223 ext4_get_inode_flags(ei);
224 flags = ei->i_flags & EXT4_FL_USER_VISIBLE;
225 return put_user(flags, (int __user *) arg);
226 case EXT4_IOC_SETFLAGS: {
227 handle_t *handle = NULL;
228 int err, migrate = 0;
229 struct ext4_iloc iloc;
230 unsigned int oldflags, mask, i;
233 if (!inode_owner_or_capable(inode))
236 if (get_user(flags, (int __user *) arg))
239 err = mnt_want_write_file(filp);
243 flags = ext4_mask_flags(inode->i_mode, flags);
246 mutex_lock(&inode->i_mutex);
247 /* Is it quota file? Do not allow user to mess with it */
248 if (IS_NOQUOTA(inode))
251 oldflags = ei->i_flags;
253 /* The JOURNAL_DATA flag is modifiable only by root */
254 jflag = flags & EXT4_JOURNAL_DATA_FL;
257 * The IMMUTABLE and APPEND_ONLY flags can only be changed by
258 * the relevant capability.
260 * This test looks nicer. Thanks to Pauline Middelink
262 if ((flags ^ oldflags) & (EXT4_APPEND_FL | EXT4_IMMUTABLE_FL)) {
263 if (!capable(CAP_LINUX_IMMUTABLE))
268 * The JOURNAL_DATA flag can only be changed by
269 * the relevant capability.
271 if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL)) {
272 if (!capable(CAP_SYS_RESOURCE))
275 if ((flags ^ oldflags) & EXT4_EXTENTS_FL)
278 if (flags & EXT4_EOFBLOCKS_FL) {
279 /* we don't support adding EOFBLOCKS flag */
280 if (!(oldflags & EXT4_EOFBLOCKS_FL)) {
284 } else if (oldflags & EXT4_EOFBLOCKS_FL)
285 ext4_truncate(inode);
287 handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
288 if (IS_ERR(handle)) {
289 err = PTR_ERR(handle);
293 ext4_handle_sync(handle);
294 err = ext4_reserve_inode_write(handle, inode, &iloc);
298 for (i = 0, mask = 1; i < 32; i++, mask <<= 1) {
299 if (!(mask & EXT4_FL_USER_MODIFIABLE))
302 ext4_set_inode_flag(inode, i);
304 ext4_clear_inode_flag(inode, i);
307 ext4_set_inode_flags(inode);
308 inode->i_ctime = ext4_current_time(inode);
310 err = ext4_mark_iloc_dirty(handle, inode, &iloc);
312 ext4_journal_stop(handle);
316 if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL))
317 err = ext4_change_inode_journal_flag(inode, jflag);
321 if (flags & EXT4_EXTENTS_FL)
322 err = ext4_ext_migrate(inode);
324 err = ext4_ind_migrate(inode);
328 mutex_unlock(&inode->i_mutex);
329 mnt_drop_write_file(filp);
332 case EXT4_IOC_GETVERSION:
333 case EXT4_IOC_GETVERSION_OLD:
334 return put_user(inode->i_generation, (int __user *) arg);
335 case EXT4_IOC_SETVERSION:
336 case EXT4_IOC_SETVERSION_OLD: {
338 struct ext4_iloc iloc;
342 if (!inode_owner_or_capable(inode))
345 if (EXT4_HAS_RO_COMPAT_FEATURE(inode->i_sb,
346 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) {
347 ext4_warning(sb, "Setting inode version is not "
348 "supported with metadata_csum enabled.");
352 err = mnt_want_write_file(filp);
355 if (get_user(generation, (int __user *) arg)) {
360 mutex_lock(&inode->i_mutex);
361 handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
362 if (IS_ERR(handle)) {
363 err = PTR_ERR(handle);
366 err = ext4_reserve_inode_write(handle, inode, &iloc);
368 inode->i_ctime = ext4_current_time(inode);
369 inode->i_generation = generation;
370 err = ext4_mark_iloc_dirty(handle, inode, &iloc);
372 ext4_journal_stop(handle);
375 mutex_unlock(&inode->i_mutex);
377 mnt_drop_write_file(filp);
380 case EXT4_IOC_GROUP_EXTEND: {
381 ext4_fsblk_t n_blocks_count;
384 err = ext4_resize_begin(sb);
388 if (get_user(n_blocks_count, (__u32 __user *)arg)) {
390 goto group_extend_out;
393 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
394 EXT4_FEATURE_RO_COMPAT_BIGALLOC)) {
395 ext4_msg(sb, KERN_ERR,
396 "Online resizing not supported with bigalloc");
398 goto group_extend_out;
401 err = mnt_want_write_file(filp);
403 goto group_extend_out;
405 err = ext4_group_extend(sb, EXT4_SB(sb)->s_es, n_blocks_count);
406 if (EXT4_SB(sb)->s_journal) {
407 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
408 err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
409 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
413 mnt_drop_write_file(filp);
419 case EXT4_IOC_MOVE_EXT: {
420 struct move_extent me;
424 if (!(filp->f_mode & FMODE_READ) ||
425 !(filp->f_mode & FMODE_WRITE))
428 if (copy_from_user(&me,
429 (struct move_extent __user *)arg, sizeof(me)))
433 donor = fdget(me.donor_fd);
437 if (!(donor.file->f_mode & FMODE_WRITE)) {
442 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
443 EXT4_FEATURE_RO_COMPAT_BIGALLOC)) {
444 ext4_msg(sb, KERN_ERR,
445 "Online defrag not supported with bigalloc");
450 err = mnt_want_write_file(filp);
454 err = ext4_move_extents(filp, donor.file, me.orig_start,
455 me.donor_start, me.len, &me.moved_len);
456 mnt_drop_write_file(filp);
458 if (copy_to_user((struct move_extent __user *)arg,
466 case EXT4_IOC_GROUP_ADD: {
467 struct ext4_new_group_data input;
470 err = ext4_resize_begin(sb);
474 if (copy_from_user(&input, (struct ext4_new_group_input __user *)arg,
480 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
481 EXT4_FEATURE_RO_COMPAT_BIGALLOC)) {
482 ext4_msg(sb, KERN_ERR,
483 "Online resizing not supported with bigalloc");
488 err = mnt_want_write_file(filp);
492 err = ext4_group_add(sb, &input);
493 if (EXT4_SB(sb)->s_journal) {
494 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
495 err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
496 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
500 mnt_drop_write_file(filp);
501 if (!err && ext4_has_group_desc_csum(sb) &&
502 test_opt(sb, INIT_INODE_TABLE))
503 err = ext4_register_li_request(sb, input.group);
509 case EXT4_IOC_MIGRATE:
512 if (!inode_owner_or_capable(inode))
515 err = mnt_want_write_file(filp);
519 * inode_mutex prevent write and truncate on the file.
520 * Read still goes through. We take i_data_sem in
521 * ext4_ext_swap_inode_data before we switch the
522 * inode format to prevent read.
524 mutex_lock(&(inode->i_mutex));
525 err = ext4_ext_migrate(inode);
526 mutex_unlock(&(inode->i_mutex));
527 mnt_drop_write_file(filp);
531 case EXT4_IOC_ALLOC_DA_BLKS:
534 if (!inode_owner_or_capable(inode))
537 err = mnt_want_write_file(filp);
540 err = ext4_alloc_da_blocks(inode);
541 mnt_drop_write_file(filp);
545 case EXT4_IOC_SWAP_BOOT:
546 if (!(filp->f_mode & FMODE_WRITE))
548 return swap_inode_boot_loader(sb, inode);
550 case EXT4_IOC_RESIZE_FS: {
551 ext4_fsblk_t n_blocks_count;
552 int err = 0, err2 = 0;
553 ext4_group_t o_group = EXT4_SB(sb)->s_groups_count;
555 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
556 EXT4_FEATURE_RO_COMPAT_BIGALLOC)) {
557 ext4_msg(sb, KERN_ERR,
558 "Online resizing not (yet) supported with bigalloc");
562 if (copy_from_user(&n_blocks_count, (__u64 __user *)arg,
567 err = ext4_resize_begin(sb);
571 err = mnt_want_write_file(filp);
575 err = ext4_resize_fs(sb, n_blocks_count);
576 if (EXT4_SB(sb)->s_journal) {
577 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
578 err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
579 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
583 mnt_drop_write_file(filp);
584 if (!err && (o_group > EXT4_SB(sb)->s_groups_count) &&
585 ext4_has_group_desc_csum(sb) &&
586 test_opt(sb, INIT_INODE_TABLE))
587 err = ext4_register_li_request(sb, o_group);
596 struct request_queue *q = bdev_get_queue(sb->s_bdev);
597 struct fstrim_range range;
600 if (!capable(CAP_SYS_ADMIN))
603 if (!blk_queue_discard(q))
606 if (copy_from_user(&range, (struct fstrim_range __user *)arg,
610 range.minlen = max((unsigned int)range.minlen,
611 q->limits.discard_granularity);
612 ret = ext4_trim_fs(sb, &range);
616 if (copy_to_user((struct fstrim_range __user *)arg, &range,
622 case EXT4_IOC_PRECACHE_EXTENTS:
623 return ext4_ext_precache(inode);
631 long ext4_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
633 /* These are just misnamed, they actually get/put from/to user an int */
635 case EXT4_IOC32_GETFLAGS:
636 cmd = EXT4_IOC_GETFLAGS;
638 case EXT4_IOC32_SETFLAGS:
639 cmd = EXT4_IOC_SETFLAGS;
641 case EXT4_IOC32_GETVERSION:
642 cmd = EXT4_IOC_GETVERSION;
644 case EXT4_IOC32_SETVERSION:
645 cmd = EXT4_IOC_SETVERSION;
647 case EXT4_IOC32_GROUP_EXTEND:
648 cmd = EXT4_IOC_GROUP_EXTEND;
650 case EXT4_IOC32_GETVERSION_OLD:
651 cmd = EXT4_IOC_GETVERSION_OLD;
653 case EXT4_IOC32_SETVERSION_OLD:
654 cmd = EXT4_IOC_SETVERSION_OLD;
656 case EXT4_IOC32_GETRSVSZ:
657 cmd = EXT4_IOC_GETRSVSZ;
659 case EXT4_IOC32_SETRSVSZ:
660 cmd = EXT4_IOC_SETRSVSZ;
662 case EXT4_IOC32_GROUP_ADD: {
663 struct compat_ext4_new_group_input __user *uinput;
664 struct ext4_new_group_input input;
668 uinput = compat_ptr(arg);
669 err = get_user(input.group, &uinput->group);
670 err |= get_user(input.block_bitmap, &uinput->block_bitmap);
671 err |= get_user(input.inode_bitmap, &uinput->inode_bitmap);
672 err |= get_user(input.inode_table, &uinput->inode_table);
673 err |= get_user(input.blocks_count, &uinput->blocks_count);
674 err |= get_user(input.reserved_blocks,
675 &uinput->reserved_blocks);
680 err = ext4_ioctl(file, EXT4_IOC_GROUP_ADD,
681 (unsigned long) &input);
685 case EXT4_IOC_MOVE_EXT:
687 case EXT4_IOC_RESIZE_FS:
688 case EXT4_IOC_PRECACHE_EXTENTS:
693 return ext4_ioctl(file, cmd, (unsigned long) compat_ptr(arg));