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"
20 #include "ext4_extents.h"
22 #define MAX_32_NUM ((((unsigned long long) 1) << 32) - 1)
25 * Swap memory between @a and @b for @len bytes.
27 * @a: pointer to first memory area
28 * @b: pointer to second memory area
29 * @len: number of bytes to swap
32 static void memswap(void *a, void *b, size_t len)
34 unsigned char *ap, *bp;
37 ap = (unsigned char *)a;
38 bp = (unsigned char *)b;
49 * Swap i_data and associated attributes between @inode1 and @inode2.
50 * This function is used for the primary swap between inode1 and inode2
51 * and also to revert this primary swap in case of errors.
53 * Therefore you have to make sure, that calling this method twice
54 * will revert all changes.
56 * @inode1: pointer to first inode
57 * @inode2: pointer to second inode
59 static void swap_inode_data(struct inode *inode1, struct inode *inode2)
62 struct ext4_inode_info *ei1;
63 struct ext4_inode_info *ei2;
68 memswap(&inode1->i_flags, &inode2->i_flags, sizeof(inode1->i_flags));
69 memswap(&inode1->i_version, &inode2->i_version,
70 sizeof(inode1->i_version));
71 memswap(&inode1->i_blocks, &inode2->i_blocks,
72 sizeof(inode1->i_blocks));
73 memswap(&inode1->i_bytes, &inode2->i_bytes, sizeof(inode1->i_bytes));
74 memswap(&inode1->i_atime, &inode2->i_atime, sizeof(inode1->i_atime));
75 memswap(&inode1->i_mtime, &inode2->i_mtime, sizeof(inode1->i_mtime));
77 memswap(ei1->i_data, ei2->i_data, sizeof(ei1->i_data));
78 memswap(&ei1->i_flags, &ei2->i_flags, sizeof(ei1->i_flags));
79 memswap(&ei1->i_disksize, &ei2->i_disksize, sizeof(ei1->i_disksize));
80 ext4_es_remove_extent(inode1, 0, EXT_MAX_BLOCKS);
81 ext4_es_remove_extent(inode2, 0, EXT_MAX_BLOCKS);
82 ext4_es_lru_del(inode1);
83 ext4_es_lru_del(inode2);
85 isize = i_size_read(inode1);
86 i_size_write(inode1, i_size_read(inode2));
87 i_size_write(inode2, isize);
91 * Swap the information from the given @inode and the inode
92 * EXT4_BOOT_LOADER_INO. It will basically swap i_data and all other
93 * important fields of the inodes.
95 * @sb: the super block of the filesystem
96 * @inode: the inode to swap with EXT4_BOOT_LOADER_INO
99 static long swap_inode_boot_loader(struct super_block *sb,
104 struct inode *inode_bl;
105 struct ext4_inode_info *ei;
106 struct ext4_inode_info *ei_bl;
107 struct ext4_sb_info *sbi;
109 if (inode->i_nlink != 1 || !S_ISREG(inode->i_mode)) {
114 if (!inode_owner_or_capable(inode) || !capable(CAP_SYS_ADMIN)) {
122 inode_bl = ext4_iget(sb, EXT4_BOOT_LOADER_INO);
123 if (IS_ERR(inode_bl)) {
124 err = PTR_ERR(inode_bl);
127 ei_bl = EXT4_I(inode_bl);
129 filemap_flush(inode->i_mapping);
130 filemap_flush(inode_bl->i_mapping);
132 /* Protect orig inodes against a truncate and make sure,
133 * that only 1 swap_inode_boot_loader is running. */
134 ext4_inode_double_lock(inode, inode_bl);
136 truncate_inode_pages(&inode->i_data, 0);
137 truncate_inode_pages(&inode_bl->i_data, 0);
139 /* Wait for all existing dio workers */
140 ext4_inode_block_unlocked_dio(inode);
141 ext4_inode_block_unlocked_dio(inode_bl);
142 inode_dio_wait(inode);
143 inode_dio_wait(inode_bl);
145 handle = ext4_journal_start(inode_bl, EXT4_HT_MOVE_EXTENTS, 2);
146 if (IS_ERR(handle)) {
148 goto journal_err_out;
151 /* Protect extent tree against block allocations via delalloc */
152 ext4_double_down_write_data_sem(inode, inode_bl);
154 if (inode_bl->i_nlink == 0) {
155 /* this inode has never been used as a BOOT_LOADER */
156 set_nlink(inode_bl, 1);
157 i_uid_write(inode_bl, 0);
158 i_gid_write(inode_bl, 0);
159 inode_bl->i_flags = 0;
161 inode_bl->i_version = 1;
162 i_size_write(inode_bl, 0);
163 inode_bl->i_mode = S_IFREG;
164 if (EXT4_HAS_INCOMPAT_FEATURE(sb,
165 EXT4_FEATURE_INCOMPAT_EXTENTS)) {
166 ext4_set_inode_flag(inode_bl, EXT4_INODE_EXTENTS);
167 ext4_ext_tree_init(handle, inode_bl);
169 memset(ei_bl->i_data, 0, sizeof(ei_bl->i_data));
172 swap_inode_data(inode, inode_bl);
174 inode->i_ctime = inode_bl->i_ctime = ext4_current_time(inode);
176 spin_lock(&sbi->s_next_gen_lock);
177 inode->i_generation = sbi->s_next_generation++;
178 inode_bl->i_generation = sbi->s_next_generation++;
179 spin_unlock(&sbi->s_next_gen_lock);
181 ext4_discard_preallocations(inode);
183 err = ext4_mark_inode_dirty(handle, inode);
185 ext4_warning(inode->i_sb,
186 "couldn't mark inode #%lu dirty (err %d)",
188 /* Revert all changes: */
189 swap_inode_data(inode, inode_bl);
191 err = ext4_mark_inode_dirty(handle, inode_bl);
193 ext4_warning(inode_bl->i_sb,
194 "couldn't mark inode #%lu dirty (err %d)",
195 inode_bl->i_ino, err);
196 /* Revert all changes: */
197 swap_inode_data(inode, inode_bl);
198 ext4_mark_inode_dirty(handle, inode);
202 ext4_journal_stop(handle);
204 ext4_double_up_write_data_sem(inode, inode_bl);
207 ext4_inode_resume_unlocked_dio(inode);
208 ext4_inode_resume_unlocked_dio(inode_bl);
210 ext4_inode_double_unlock(inode, inode_bl);
218 long ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
220 struct inode *inode = file_inode(filp);
221 struct super_block *sb = inode->i_sb;
222 struct ext4_inode_info *ei = EXT4_I(inode);
225 ext4_debug("cmd = %u, arg = %lu\n", cmd, arg);
228 case EXT4_IOC_GETFLAGS:
229 ext4_get_inode_flags(ei);
230 flags = ei->i_flags & EXT4_FL_USER_VISIBLE;
231 return put_user(flags, (int __user *) arg);
232 case EXT4_IOC_SETFLAGS: {
233 handle_t *handle = NULL;
234 int err, migrate = 0;
235 struct ext4_iloc iloc;
236 unsigned int oldflags, mask, i;
239 if (!inode_owner_or_capable(inode))
242 if (get_user(flags, (int __user *) arg))
245 err = mnt_want_write_file(filp);
249 flags = ext4_mask_flags(inode->i_mode, flags);
252 mutex_lock(&inode->i_mutex);
253 /* Is it quota file? Do not allow user to mess with it */
254 if (IS_NOQUOTA(inode))
257 oldflags = ei->i_flags;
259 /* The JOURNAL_DATA flag is modifiable only by root */
260 jflag = flags & EXT4_JOURNAL_DATA_FL;
263 * The IMMUTABLE and APPEND_ONLY flags can only be changed by
264 * the relevant capability.
266 * This test looks nicer. Thanks to Pauline Middelink
268 if ((flags ^ oldflags) & (EXT4_APPEND_FL | EXT4_IMMUTABLE_FL)) {
269 if (!capable(CAP_LINUX_IMMUTABLE))
274 * The JOURNAL_DATA flag can only be changed by
275 * the relevant capability.
277 if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL)) {
278 if (!capable(CAP_SYS_RESOURCE))
281 if ((flags ^ oldflags) & EXT4_EXTENTS_FL)
284 if (flags & EXT4_EOFBLOCKS_FL) {
285 /* we don't support adding EOFBLOCKS flag */
286 if (!(oldflags & EXT4_EOFBLOCKS_FL)) {
290 } else if (oldflags & EXT4_EOFBLOCKS_FL)
291 ext4_truncate(inode);
293 handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
294 if (IS_ERR(handle)) {
295 err = PTR_ERR(handle);
299 ext4_handle_sync(handle);
300 err = ext4_reserve_inode_write(handle, inode, &iloc);
304 for (i = 0, mask = 1; i < 32; i++, mask <<= 1) {
305 if (!(mask & EXT4_FL_USER_MODIFIABLE))
308 ext4_set_inode_flag(inode, i);
310 ext4_clear_inode_flag(inode, i);
313 ext4_set_inode_flags(inode);
314 inode->i_ctime = ext4_current_time(inode);
316 err = ext4_mark_iloc_dirty(handle, inode, &iloc);
318 ext4_journal_stop(handle);
322 if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL))
323 err = ext4_change_inode_journal_flag(inode, jflag);
327 if (flags & EXT4_EXTENTS_FL)
328 err = ext4_ext_migrate(inode);
330 err = ext4_ind_migrate(inode);
334 mutex_unlock(&inode->i_mutex);
335 mnt_drop_write_file(filp);
338 case EXT4_IOC_GETVERSION:
339 case EXT4_IOC_GETVERSION_OLD:
340 return put_user(inode->i_generation, (int __user *) arg);
341 case EXT4_IOC_SETVERSION:
342 case EXT4_IOC_SETVERSION_OLD: {
344 struct ext4_iloc iloc;
348 if (!inode_owner_or_capable(inode))
351 if (EXT4_HAS_RO_COMPAT_FEATURE(inode->i_sb,
352 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) {
353 ext4_warning(sb, "Setting inode version is not "
354 "supported with metadata_csum enabled.");
358 err = mnt_want_write_file(filp);
361 if (get_user(generation, (int __user *) arg)) {
366 mutex_lock(&inode->i_mutex);
367 handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
368 if (IS_ERR(handle)) {
369 err = PTR_ERR(handle);
372 err = ext4_reserve_inode_write(handle, inode, &iloc);
374 inode->i_ctime = ext4_current_time(inode);
375 inode->i_generation = generation;
376 err = ext4_mark_iloc_dirty(handle, inode, &iloc);
378 ext4_journal_stop(handle);
381 mutex_unlock(&inode->i_mutex);
383 mnt_drop_write_file(filp);
386 case EXT4_IOC_GROUP_EXTEND: {
387 ext4_fsblk_t n_blocks_count;
390 err = ext4_resize_begin(sb);
394 if (get_user(n_blocks_count, (__u32 __user *)arg)) {
396 goto group_extend_out;
399 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
400 EXT4_FEATURE_RO_COMPAT_BIGALLOC)) {
401 ext4_msg(sb, KERN_ERR,
402 "Online resizing not supported with bigalloc");
404 goto group_extend_out;
407 err = mnt_want_write_file(filp);
409 goto group_extend_out;
411 err = ext4_group_extend(sb, EXT4_SB(sb)->s_es, n_blocks_count);
412 if (EXT4_SB(sb)->s_journal) {
413 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
414 err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
415 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
419 mnt_drop_write_file(filp);
425 case EXT4_IOC_MOVE_EXT: {
426 struct move_extent me;
430 if (!(filp->f_mode & FMODE_READ) ||
431 !(filp->f_mode & FMODE_WRITE))
434 if (copy_from_user(&me,
435 (struct move_extent __user *)arg, sizeof(me)))
439 donor = fdget(me.donor_fd);
443 if (!(donor.file->f_mode & FMODE_WRITE)) {
448 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
449 EXT4_FEATURE_RO_COMPAT_BIGALLOC)) {
450 ext4_msg(sb, KERN_ERR,
451 "Online defrag not supported with bigalloc");
456 err = mnt_want_write_file(filp);
460 err = ext4_move_extents(filp, donor.file, me.orig_start,
461 me.donor_start, me.len, &me.moved_len);
462 mnt_drop_write_file(filp);
464 if (copy_to_user((struct move_extent __user *)arg,
472 case EXT4_IOC_GROUP_ADD: {
473 struct ext4_new_group_data input;
476 err = ext4_resize_begin(sb);
480 if (copy_from_user(&input, (struct ext4_new_group_input __user *)arg,
486 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
487 EXT4_FEATURE_RO_COMPAT_BIGALLOC)) {
488 ext4_msg(sb, KERN_ERR,
489 "Online resizing not supported with bigalloc");
494 err = mnt_want_write_file(filp);
498 err = ext4_group_add(sb, &input);
499 if (EXT4_SB(sb)->s_journal) {
500 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
501 err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
502 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
506 mnt_drop_write_file(filp);
507 if (!err && ext4_has_group_desc_csum(sb) &&
508 test_opt(sb, INIT_INODE_TABLE))
509 err = ext4_register_li_request(sb, input.group);
515 case EXT4_IOC_MIGRATE:
518 if (!inode_owner_or_capable(inode))
521 err = mnt_want_write_file(filp);
525 * inode_mutex prevent write and truncate on the file.
526 * Read still goes through. We take i_data_sem in
527 * ext4_ext_swap_inode_data before we switch the
528 * inode format to prevent read.
530 mutex_lock(&(inode->i_mutex));
531 err = ext4_ext_migrate(inode);
532 mutex_unlock(&(inode->i_mutex));
533 mnt_drop_write_file(filp);
537 case EXT4_IOC_ALLOC_DA_BLKS:
540 if (!inode_owner_or_capable(inode))
543 err = mnt_want_write_file(filp);
546 err = ext4_alloc_da_blocks(inode);
547 mnt_drop_write_file(filp);
551 case EXT4_IOC_SWAP_BOOT:
552 if (!(filp->f_mode & FMODE_WRITE))
554 return swap_inode_boot_loader(sb, inode);
556 case EXT4_IOC_RESIZE_FS: {
557 ext4_fsblk_t n_blocks_count;
558 int err = 0, err2 = 0;
559 ext4_group_t o_group = EXT4_SB(sb)->s_groups_count;
561 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
562 EXT4_FEATURE_RO_COMPAT_BIGALLOC)) {
563 ext4_msg(sb, KERN_ERR,
564 "Online resizing not (yet) supported with bigalloc");
568 if (copy_from_user(&n_blocks_count, (__u64 __user *)arg,
573 err = ext4_resize_begin(sb);
577 err = mnt_want_write_file(filp);
581 err = ext4_resize_fs(sb, n_blocks_count);
582 if (EXT4_SB(sb)->s_journal) {
583 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
584 err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
585 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
589 mnt_drop_write_file(filp);
590 if (!err && (o_group > EXT4_SB(sb)->s_groups_count) &&
591 ext4_has_group_desc_csum(sb) &&
592 test_opt(sb, INIT_INODE_TABLE))
593 err = ext4_register_li_request(sb, o_group);
603 struct request_queue *q = bdev_get_queue(sb->s_bdev);
604 struct fstrim_range range;
606 int flags = cmd == FIDTRIM ? BLKDEV_DISCARD_SECURE : 0;
608 if (!capable(CAP_SYS_ADMIN))
611 if (!blk_queue_discard(q))
614 if ((flags & BLKDEV_DISCARD_SECURE) && !blk_queue_secdiscard(q))
616 if (copy_from_user(&range, (struct fstrim_range __user *)arg,
620 range.minlen = max((unsigned int)range.minlen,
621 q->limits.discard_granularity);
622 ret = ext4_trim_fs(sb, &range, flags);
626 if (copy_to_user((struct fstrim_range __user *)arg, &range,
639 long ext4_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
641 /* These are just misnamed, they actually get/put from/to user an int */
643 case EXT4_IOC32_GETFLAGS:
644 cmd = EXT4_IOC_GETFLAGS;
646 case EXT4_IOC32_SETFLAGS:
647 cmd = EXT4_IOC_SETFLAGS;
649 case EXT4_IOC32_GETVERSION:
650 cmd = EXT4_IOC_GETVERSION;
652 case EXT4_IOC32_SETVERSION:
653 cmd = EXT4_IOC_SETVERSION;
655 case EXT4_IOC32_GROUP_EXTEND:
656 cmd = EXT4_IOC_GROUP_EXTEND;
658 case EXT4_IOC32_GETVERSION_OLD:
659 cmd = EXT4_IOC_GETVERSION_OLD;
661 case EXT4_IOC32_SETVERSION_OLD:
662 cmd = EXT4_IOC_SETVERSION_OLD;
664 case EXT4_IOC32_GETRSVSZ:
665 cmd = EXT4_IOC_GETRSVSZ;
667 case EXT4_IOC32_SETRSVSZ:
668 cmd = EXT4_IOC_SETRSVSZ;
670 case EXT4_IOC32_GROUP_ADD: {
671 struct compat_ext4_new_group_input __user *uinput;
672 struct ext4_new_group_input input;
676 uinput = compat_ptr(arg);
677 err = get_user(input.group, &uinput->group);
678 err |= get_user(input.block_bitmap, &uinput->block_bitmap);
679 err |= get_user(input.inode_bitmap, &uinput->inode_bitmap);
680 err |= get_user(input.inode_table, &uinput->inode_table);
681 err |= get_user(input.blocks_count, &uinput->blocks_count);
682 err |= get_user(input.reserved_blocks,
683 &uinput->reserved_blocks);
688 err = ext4_ioctl(file, EXT4_IOC_GROUP_ADD,
689 (unsigned long) &input);
693 case EXT4_IOC_MOVE_EXT:
695 case EXT4_IOC_RESIZE_FS:
700 return ext4_ioctl(file, cmd, (unsigned long) compat_ptr(arg));