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)
23 long ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
25 struct inode *inode = filp->f_dentry->d_inode;
26 struct super_block *sb = inode->i_sb;
27 struct ext4_inode_info *ei = EXT4_I(inode);
30 ext4_debug("cmd = %u, arg = %lu\n", cmd, arg);
33 case EXT4_IOC_GETFLAGS:
34 ext4_get_inode_flags(ei);
35 flags = ei->i_flags & EXT4_FL_USER_VISIBLE;
36 return put_user(flags, (int __user *) arg);
37 case EXT4_IOC_SETFLAGS: {
38 handle_t *handle = NULL;
40 struct ext4_iloc iloc;
41 unsigned int oldflags;
44 if (!inode_owner_or_capable(inode))
47 if (get_user(flags, (int __user *) arg))
50 err = mnt_want_write_file(filp);
54 flags = ext4_mask_flags(inode->i_mode, flags);
57 mutex_lock(&inode->i_mutex);
58 /* Is it quota file? Do not allow user to mess with it */
59 if (IS_NOQUOTA(inode))
62 oldflags = ei->i_flags;
64 /* The JOURNAL_DATA flag is modifiable only by root */
65 jflag = flags & EXT4_JOURNAL_DATA_FL;
68 * The IMMUTABLE and APPEND_ONLY flags can only be changed by
69 * the relevant capability.
71 * This test looks nicer. Thanks to Pauline Middelink
73 if ((flags ^ oldflags) & (EXT4_APPEND_FL | EXT4_IMMUTABLE_FL)) {
74 if (!capable(CAP_LINUX_IMMUTABLE))
79 * The JOURNAL_DATA flag can only be changed by
80 * the relevant capability.
82 if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL)) {
83 if (!capable(CAP_SYS_RESOURCE))
86 if (oldflags & EXT4_EXTENTS_FL) {
87 /* We don't support clearning extent flags */
88 if (!(flags & EXT4_EXTENTS_FL)) {
92 } else if (flags & EXT4_EXTENTS_FL) {
93 /* migrate the file */
95 flags &= ~EXT4_EXTENTS_FL;
98 if (flags & EXT4_EOFBLOCKS_FL) {
99 /* we don't support adding EOFBLOCKS flag */
100 if (!(oldflags & EXT4_EOFBLOCKS_FL)) {
104 } else if (oldflags & EXT4_EOFBLOCKS_FL)
105 ext4_truncate(inode);
107 handle = ext4_journal_start(inode, 1);
108 if (IS_ERR(handle)) {
109 err = PTR_ERR(handle);
113 ext4_handle_sync(handle);
114 err = ext4_reserve_inode_write(handle, inode, &iloc);
118 flags = flags & EXT4_FL_USER_MODIFIABLE;
119 flags |= oldflags & ~EXT4_FL_USER_MODIFIABLE;
122 ext4_set_inode_flags(inode);
123 inode->i_ctime = ext4_current_time(inode);
125 err = ext4_mark_iloc_dirty(handle, inode, &iloc);
127 ext4_journal_stop(handle);
131 if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL))
132 err = ext4_change_inode_journal_flag(inode, jflag);
136 err = ext4_ext_migrate(inode);
138 mutex_unlock(&inode->i_mutex);
139 mnt_drop_write_file(filp);
142 case EXT4_IOC_GETVERSION:
143 case EXT4_IOC_GETVERSION_OLD:
144 return put_user(inode->i_generation, (int __user *) arg);
145 case EXT4_IOC_SETVERSION:
146 case EXT4_IOC_SETVERSION_OLD: {
148 struct ext4_iloc iloc;
152 if (!inode_owner_or_capable(inode))
155 err = mnt_want_write_file(filp);
158 if (get_user(generation, (int __user *) arg)) {
163 mutex_lock(&inode->i_mutex);
164 handle = ext4_journal_start(inode, 1);
165 if (IS_ERR(handle)) {
166 err = PTR_ERR(handle);
169 err = ext4_reserve_inode_write(handle, inode, &iloc);
171 inode->i_ctime = ext4_current_time(inode);
172 inode->i_generation = generation;
173 err = ext4_mark_iloc_dirty(handle, inode, &iloc);
175 ext4_journal_stop(handle);
178 mutex_unlock(&inode->i_mutex);
180 mnt_drop_write_file(filp);
183 case EXT4_IOC_GROUP_EXTEND: {
184 ext4_fsblk_t n_blocks_count;
187 err = ext4_resize_begin(sb);
191 if (get_user(n_blocks_count, (__u32 __user *)arg)) {
193 goto group_extend_out;
196 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
197 EXT4_FEATURE_RO_COMPAT_BIGALLOC)) {
198 ext4_msg(sb, KERN_ERR,
199 "Online resizing not supported with bigalloc");
201 goto group_extend_out;
204 err = mnt_want_write_file(filp);
206 goto group_extend_out;
208 err = ext4_group_extend(sb, EXT4_SB(sb)->s_es, n_blocks_count);
209 if (EXT4_SB(sb)->s_journal) {
210 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
211 err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
212 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
216 mnt_drop_write_file(filp);
222 case EXT4_IOC_MOVE_EXT: {
223 struct move_extent me;
224 struct file *donor_filp;
227 if (!(filp->f_mode & FMODE_READ) ||
228 !(filp->f_mode & FMODE_WRITE))
231 if (copy_from_user(&me,
232 (struct move_extent __user *)arg, sizeof(me)))
236 donor_filp = fget(me.donor_fd);
240 if (!(donor_filp->f_mode & FMODE_WRITE)) {
245 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
246 EXT4_FEATURE_RO_COMPAT_BIGALLOC)) {
247 ext4_msg(sb, KERN_ERR,
248 "Online defrag not supported with bigalloc");
252 err = mnt_want_write_file(filp);
256 err = ext4_move_extents(filp, donor_filp, me.orig_start,
257 me.donor_start, me.len, &me.moved_len);
258 mnt_drop_write_file(filp);
259 mnt_drop_write(filp->f_path.mnt);
261 if (copy_to_user((struct move_extent __user *)arg,
269 case EXT4_IOC_GROUP_ADD: {
270 struct ext4_new_group_data input;
273 err = ext4_resize_begin(sb);
277 if (copy_from_user(&input, (struct ext4_new_group_input __user *)arg,
283 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
284 EXT4_FEATURE_RO_COMPAT_BIGALLOC)) {
285 ext4_msg(sb, KERN_ERR,
286 "Online resizing not supported with bigalloc");
291 err = mnt_want_write_file(filp);
295 err = ext4_group_add(sb, &input);
296 if (EXT4_SB(sb)->s_journal) {
297 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
298 err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
299 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
303 mnt_drop_write_file(filp);
309 case EXT4_IOC_MIGRATE:
312 if (!inode_owner_or_capable(inode))
315 err = mnt_want_write_file(filp);
319 * inode_mutex prevent write and truncate on the file.
320 * Read still goes through. We take i_data_sem in
321 * ext4_ext_swap_inode_data before we switch the
322 * inode format to prevent read.
324 mutex_lock(&(inode->i_mutex));
325 err = ext4_ext_migrate(inode);
326 mutex_unlock(&(inode->i_mutex));
327 mnt_drop_write_file(filp);
331 case EXT4_IOC_ALLOC_DA_BLKS:
334 if (!inode_owner_or_capable(inode))
337 err = mnt_want_write_file(filp);
340 err = ext4_alloc_da_blocks(inode);
341 mnt_drop_write_file(filp);
345 case EXT4_IOC_RESIZE_FS: {
346 ext4_fsblk_t n_blocks_count;
347 struct super_block *sb = inode->i_sb;
348 int err = 0, err2 = 0;
350 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
351 EXT4_FEATURE_RO_COMPAT_BIGALLOC)) {
352 ext4_msg(sb, KERN_ERR,
353 "Online resizing not (yet) supported with bigalloc");
357 if (EXT4_HAS_INCOMPAT_FEATURE(sb,
358 EXT4_FEATURE_INCOMPAT_META_BG)) {
359 ext4_msg(sb, KERN_ERR,
360 "Online resizing not (yet) supported with meta_bg");
364 if (copy_from_user(&n_blocks_count, (__u64 __user *)arg,
369 if (n_blocks_count > MAX_32_NUM &&
370 !EXT4_HAS_INCOMPAT_FEATURE(sb,
371 EXT4_FEATURE_INCOMPAT_64BIT)) {
372 ext4_msg(sb, KERN_ERR,
373 "File system only supports 32-bit block numbers");
377 err = ext4_resize_begin(sb);
381 err = mnt_want_write(filp->f_path.mnt);
385 err = ext4_resize_fs(sb, n_blocks_count);
386 if (EXT4_SB(sb)->s_journal) {
387 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
388 err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
389 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
393 mnt_drop_write(filp->f_path.mnt);
401 struct request_queue *q = bdev_get_queue(sb->s_bdev);
402 struct fstrim_range range;
405 if (!capable(CAP_SYS_ADMIN))
408 if (!blk_queue_discard(q))
411 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
412 EXT4_FEATURE_RO_COMPAT_BIGALLOC)) {
413 ext4_msg(sb, KERN_ERR,
414 "FITRIM not supported with bigalloc");
418 if (copy_from_user(&range, (struct fstrim_range __user *)arg,
422 range.minlen = max((unsigned int)range.minlen,
423 q->limits.discard_granularity);
424 ret = ext4_trim_fs(sb, &range);
428 if (copy_to_user((struct fstrim_range __user *)arg, &range,
441 long ext4_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
443 /* These are just misnamed, they actually get/put from/to user an int */
445 case EXT4_IOC32_GETFLAGS:
446 cmd = EXT4_IOC_GETFLAGS;
448 case EXT4_IOC32_SETFLAGS:
449 cmd = EXT4_IOC_SETFLAGS;
451 case EXT4_IOC32_GETVERSION:
452 cmd = EXT4_IOC_GETVERSION;
454 case EXT4_IOC32_SETVERSION:
455 cmd = EXT4_IOC_SETVERSION;
457 case EXT4_IOC32_GROUP_EXTEND:
458 cmd = EXT4_IOC_GROUP_EXTEND;
460 case EXT4_IOC32_GETVERSION_OLD:
461 cmd = EXT4_IOC_GETVERSION_OLD;
463 case EXT4_IOC32_SETVERSION_OLD:
464 cmd = EXT4_IOC_SETVERSION_OLD;
466 case EXT4_IOC32_GETRSVSZ:
467 cmd = EXT4_IOC_GETRSVSZ;
469 case EXT4_IOC32_SETRSVSZ:
470 cmd = EXT4_IOC_SETRSVSZ;
472 case EXT4_IOC32_GROUP_ADD: {
473 struct compat_ext4_new_group_input __user *uinput;
474 struct ext4_new_group_input input;
478 uinput = compat_ptr(arg);
479 err = get_user(input.group, &uinput->group);
480 err |= get_user(input.block_bitmap, &uinput->block_bitmap);
481 err |= get_user(input.inode_bitmap, &uinput->inode_bitmap);
482 err |= get_user(input.inode_table, &uinput->inode_table);
483 err |= get_user(input.blocks_count, &uinput->blocks_count);
484 err |= get_user(input.reserved_blocks,
485 &uinput->reserved_blocks);
490 err = ext4_ioctl(file, EXT4_IOC_GROUP_ADD,
491 (unsigned long) &input);
495 case EXT4_IOC_MOVE_EXT:
497 case EXT4_IOC_RESIZE_FS:
502 return ext4_ioctl(file, cmd, (unsigned long) compat_ptr(arg));