[deliverable/linux.git] / fs / ext4 / ioctl.c

/*
 * linux/fs/ext4/ioctl.c
 *
 * Copyright (C) 1993, 1994, 1995
 * Remy Card (card@masi.ibp.fr)
 * Laboratoire MASI - Institut Blaise Pascal
 * Universite Pierre et Marie Curie (Paris VI)
 */

#include <linux/fs.h>
#include <linux/jbd2.h>
#include <linux/capability.h>
#include <linux/time.h>
#include <linux/compat.h>
#include <linux/mount.h>
#include <linux/file.h>
#include <asm/uaccess.h>
#include "ext4_jbd2.h"
#include "ext4.h"

long ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
{
	struct inode *inode = filp->f_dentry->d_inode;
	struct ext4_inode_info *ei = EXT4_I(inode);
	unsigned int flags;

	ext4_debug("cmd = %u, arg = %lu\n", cmd, arg);

	switch (cmd) {
	case EXT4_IOC_GETFLAGS:
		ext4_get_inode_flags(ei);
		flags = ei->i_flags & EXT4_FL_USER_VISIBLE;
		return put_user(flags, (int __user *) arg);
	case EXT4_IOC_SETFLAGS: {
		handle_t *handle = NULL;
		int err, migrate = 0;
		struct ext4_iloc iloc;
		unsigned int oldflags;
		unsigned int jflag;

		if (!is_owner_or_cap(inode))
			return -EACCES;

		if (get_user(flags, (int __user *) arg))
			return -EFAULT;

		err = mnt_want_write(filp->f_path.mnt);
		if (err)
			return err;

		flags = ext4_mask_flags(inode->i_mode, flags);

		err = -EPERM;
		mutex_lock(&inode->i_mutex);
		/* Is it quota file? Do not allow user to mess with it */
		if (IS_NOQUOTA(inode))
			goto flags_out;

		oldflags = ei->i_flags;

		/* The JOURNAL_DATA flag is modifiable only by root */
		jflag = flags & EXT4_JOURNAL_DATA_FL;

		/*
		 * The IMMUTABLE and APPEND_ONLY flags can only be changed by
		 * the relevant capability.
		 *
		 * This test looks nicer. Thanks to Pauline Middelink
		 */
		if ((flags ^ oldflags) & (EXT4_APPEND_FL | EXT4_IMMUTABLE_FL)) {
			if (!capable(CAP_LINUX_IMMUTABLE))
				goto flags_out;
		}

		/*
		 * The JOURNAL_DATA flag can only be changed by
		 * the relevant capability.
		 */
		if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL)) {
			if (!capable(CAP_SYS_RESOURCE))
				goto flags_out;
		}
		if (oldflags & EXT4_EXTENTS_FL) {
			/* We don't support clearning extent flags */
			if (!(flags & EXT4_EXTENTS_FL)) {
				err = -EOPNOTSUPP;
				goto flags_out;
			}
		} else if (flags & EXT4_EXTENTS_FL) {
			/* migrate the file */
			migrate = 1;
			flags &= ~EXT4_EXTENTS_FL;
		}

		if (flags & EXT4_EOFBLOCKS_FL) {
			/* we don't support adding EOFBLOCKS flag */
			if (!(oldflags & EXT4_EOFBLOCKS_FL)) {
				err = -EOPNOTSUPP;
				goto flags_out;
			}
		} else if (oldflags & EXT4_EOFBLOCKS_FL)
			ext4_truncate(inode);

		handle = ext4_journal_start(inode, 1);
		if (IS_ERR(handle)) {
			err = PTR_ERR(handle);
			goto flags_out;
		}
		if (IS_SYNC(inode))
			ext4_handle_sync(handle);
		err = ext4_reserve_inode_write(handle, inode, &iloc);
		if (err)
			goto flags_err;

		flags = flags & EXT4_FL_USER_MODIFIABLE;
		flags |= oldflags & ~EXT4_FL_USER_MODIFIABLE;
		ei->i_flags = flags;

		ext4_set_inode_flags(inode);
		inode->i_ctime = ext4_current_time(inode);

		err = ext4_mark_iloc_dirty(handle, inode, &iloc);
flags_err:
		ext4_journal_stop(handle);
		if (err)
			goto flags_out;

		if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL))
			err = ext4_change_inode_journal_flag(inode, jflag);
		if (err)
			goto flags_out;
		if (migrate)
			err = ext4_ext_migrate(inode);
flags_out:
		mutex_unlock(&inode->i_mutex);
		mnt_drop_write(filp->f_path.mnt);
		return err;
	}
	case EXT4_IOC_GETVERSION:
	case EXT4_IOC_GETVERSION_OLD:
		return put_user(inode->i_generation, (int __user *) arg);
	case EXT4_IOC_SETVERSION:
	case EXT4_IOC_SETVERSION_OLD: {
		handle_t *handle;
		struct ext4_iloc iloc;
		__u32 generation;
		int err;

		if (!is_owner_or_cap(inode))
			return -EPERM;

		err = mnt_want_write(filp->f_path.mnt);
		if (err)
			return err;
		if (get_user(generation, (int __user *) arg)) {
			err = -EFAULT;
			goto setversion_out;
		}

		handle = ext4_journal_start(inode, 1);
		if (IS_ERR(handle)) {
			err = PTR_ERR(handle);
			goto setversion_out;
		}
		err = ext4_reserve_inode_write(handle, inode, &iloc);
		if (err == 0) {
			inode->i_ctime = ext4_current_time(inode);
			inode->i_generation = generation;
			err = ext4_mark_iloc_dirty(handle, inode, &iloc);
		}
		ext4_journal_stop(handle);
setversion_out:
		mnt_drop_write(filp->f_path.mnt);
		return err;
	}
#ifdef CONFIG_JBD2_DEBUG
	case EXT4_IOC_WAIT_FOR_READONLY:
		/*
		 * This is racy - by the time we're woken up and running,
		 * the superblock could be released.  And the module could
		 * have been unloaded.  So sue me.
		 *
		 * Returns 1 if it slept, else zero.
		 */
		{
			struct super_block *sb = inode->i_sb;
			DECLARE_WAITQUEUE(wait, current);
			int ret = 0;

			set_current_state(TASK_INTERRUPTIBLE);
			add_wait_queue(&EXT4_SB(sb)->ro_wait_queue, &wait);
			if (timer_pending(&EXT4_SB(sb)->turn_ro_timer)) {
				schedule();
				ret = 1;
			}
			remove_wait_queue(&EXT4_SB(sb)->ro_wait_queue, &wait);
			return ret;
		}
#endif
	case EXT4_IOC_GROUP_EXTEND: {
		ext4_fsblk_t n_blocks_count;
		struct super_block *sb = inode->i_sb;
		int err, err2=0;

		if (!capable(CAP_SYS_RESOURCE))
			return -EPERM;

		if (get_user(n_blocks_count, (__u32 __user *)arg))
			return -EFAULT;

		err = mnt_want_write(filp->f_path.mnt);
		if (err)
			return err;

		err = ext4_group_extend(sb, EXT4_SB(sb)->s_es, n_blocks_count);
		if (EXT4_SB(sb)->s_journal) {
			jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
			err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
			jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
		}
		if (err == 0)
			err = err2;
		mnt_drop_write(filp->f_path.mnt);

		return err;
	}

	case EXT4_IOC_MOVE_EXT: {
		struct move_extent me;
		struct file *donor_filp;
		int err;

		if (!(filp->f_mode & FMODE_READ) ||
		    !(filp->f_mode & FMODE_WRITE))
			return -EBADF;

		if (copy_from_user(&me,
			(struct move_extent __user *)arg, sizeof(me)))
			return -EFAULT;
		me.moved_len = 0;

		donor_filp = fget(me.donor_fd);
		if (!donor_filp)
			return -EBADF;

		if (!(donor_filp->f_mode & FMODE_WRITE)) {
			err = -EBADF;
			goto mext_out;
		}

		err = mnt_want_write(filp->f_path.mnt);
		if (err)
			goto mext_out;

		err = ext4_move_extents(filp, donor_filp, me.orig_start,
					me.donor_start, me.len, &me.moved_len);
		mnt_drop_write(filp->f_path.mnt);
		if (me.moved_len > 0)
			file_remove_suid(donor_filp);

		if (copy_to_user((struct move_extent *)arg, &me, sizeof(me)))
			err = -EFAULT;
mext_out:
		fput(donor_filp);
		return err;
	}

	case EXT4_IOC_GROUP_ADD: {
		struct ext4_new_group_data input;
		struct super_block *sb = inode->i_sb;
		int err, err2=0;

		if (!capable(CAP_SYS_RESOURCE))
			return -EPERM;

		if (copy_from_user(&input, (struct ext4_new_group_input __user *)arg,
				sizeof(input)))
			return -EFAULT;

		err = mnt_want_write(filp->f_path.mnt);
		if (err)
			return err;

		err = ext4_group_add(sb, &input);
		if (EXT4_SB(sb)->s_journal) {
			jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
			err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
			jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
		}
		if (err == 0)
			err = err2;
		mnt_drop_write(filp->f_path.mnt);

		return err;
	}

	case EXT4_IOC_MIGRATE:
	{
		int err;
		if (!is_owner_or_cap(inode))
			return -EACCES;

		err = mnt_want_write(filp->f_path.mnt);
		if (err)
			return err;
		/*
		 * inode_mutex prevent write and truncate on the file.
		 * Read still goes through. We take i_data_sem in
		 * ext4_ext_swap_inode_data before we switch the
		 * inode format to prevent read.
		 */
		mutex_lock(&(inode->i_mutex));
		err = ext4_ext_migrate(inode);
		mutex_unlock(&(inode->i_mutex));
		mnt_drop_write(filp->f_path.mnt);
		return err;
	}

	case EXT4_IOC_ALLOC_DA_BLKS:
	{
		int err;
		if (!is_owner_or_cap(inode))
			return -EACCES;

		err = mnt_want_write(filp->f_path.mnt);
		if (err)
			return err;
		err = ext4_alloc_da_blocks(inode);
		mnt_drop_write(filp->f_path.mnt);
		return err;
	}

	default:
		return -ENOTTY;
	}
}

#ifdef CONFIG_COMPAT
long ext4_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
	/* These are just misnamed, they actually get/put from/to user an int */
	switch (cmd) {
	case EXT4_IOC32_GETFLAGS:
		cmd = EXT4_IOC_GETFLAGS;
		break;
	case EXT4_IOC32_SETFLAGS:
		cmd = EXT4_IOC_SETFLAGS;
		break;
	case EXT4_IOC32_GETVERSION:
		cmd = EXT4_IOC_GETVERSION;
		break;
	case EXT4_IOC32_SETVERSION:
		cmd = EXT4_IOC_SETVERSION;
		break;
	case EXT4_IOC32_GROUP_EXTEND:
		cmd = EXT4_IOC_GROUP_EXTEND;
		break;
	case EXT4_IOC32_GETVERSION_OLD:
		cmd = EXT4_IOC_GETVERSION_OLD;
		break;
	case EXT4_IOC32_SETVERSION_OLD:
		cmd = EXT4_IOC_SETVERSION_OLD;
		break;
#ifdef CONFIG_JBD2_DEBUG
	case EXT4_IOC32_WAIT_FOR_READONLY:
		cmd = EXT4_IOC_WAIT_FOR_READONLY;
		break;
#endif
	case EXT4_IOC32_GETRSVSZ:
		cmd = EXT4_IOC_GETRSVSZ;
		break;
	case EXT4_IOC32_SETRSVSZ:
		cmd = EXT4_IOC_SETRSVSZ;
		break;
	case EXT4_IOC_GROUP_ADD:
		break;
	default:
		return -ENOIOCTLCMD;
	}
	return ext4_ioctl(file, cmd, (unsigned long) compat_ptr(arg));
}
#endif
Commit	Line	Data
ac27a0ec	1	/*
617ba13b	2	* linux/fs/ext4/ioctl.c
ac27a0ec DK	3	*
	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)
	8	*/
	9
	10	#include <linux/fs.h>
dab291af	11	#include <linux/jbd2.h>
ac27a0ec	12	#include <linux/capability.h>
ac27a0ec DK	13	#include <linux/time.h>
ac27a0ec DK	14	#include <linux/compat.h>
42a74f20	15	#include <linux/mount.h>
748de673	16	#include <linux/file.h>
ac27a0ec	17	#include <asm/uaccess.h>
3dcf5451 CH	18	#include "ext4_jbd2.h"
3dcf5451 CH	19	#include "ext4.h"
ac27a0ec	20
5cdd7b2d	21	long ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
ac27a0ec	22	{
5cdd7b2d	23	struct inode *inode = filp->f_dentry->d_inode;
617ba13b	24	struct ext4_inode_info *ei = EXT4_I(inode);
ac27a0ec	25	unsigned int flags;
ac27a0ec	26
af5bc92d	27	ext4_debug("cmd = %u, arg = %lu\n", cmd, arg);
ac27a0ec DK	28
ac27a0ec DK	29	switch (cmd) {
617ba13b	30	case EXT4_IOC_GETFLAGS:
ff9ddf7e	31	ext4_get_inode_flags(ei);
617ba13b	32	flags = ei->i_flags & EXT4_FL_USER_VISIBLE;
ac27a0ec	33	return put_user(flags, (int __user *) arg);
617ba13b	34	case EXT4_IOC_SETFLAGS: {
ac27a0ec	35	handle_t *handle = NULL;
4db46fc2	36	int err, migrate = 0;
617ba13b	37	struct ext4_iloc iloc;
ac27a0ec DK	38	unsigned int oldflags;
	39	unsigned int jflag;
	40
3bd858ab	41	if (!is_owner_or_cap(inode))
ac27a0ec DK	42	return -EACCES;
	43
	44	if (get_user(flags, (int __user *) arg))
	45	return -EFAULT;
	46
42a74f20 DH	47	err = mnt_want_write(filp->f_path.mnt);
	48	if (err)
	49	return err;
	50
2dc6b0d4	51	flags = ext4_mask_flags(inode->i_mode, flags);
ac27a0ec	52
42a74f20	53	err = -EPERM;
ac27a0ec	54	mutex_lock(&inode->i_mutex);
e47776a0	55	/* Is it quota file? Do not allow user to mess with it */
42a74f20 DH	56	if (IS_NOQUOTA(inode))
	57	goto flags_out;
	58
ac27a0ec DK	59	oldflags = ei->i_flags;
	60
	61	/* The JOURNAL_DATA flag is modifiable only by root */
617ba13b	62	jflag = flags & EXT4_JOURNAL_DATA_FL;
ac27a0ec DK	63
	64	/*
	65	* The IMMUTABLE and APPEND_ONLY flags can only be changed by
	66	* the relevant capability.
	67	*
	68	* This test looks nicer. Thanks to Pauline Middelink
	69	*/
617ba13b	70	if ((flags ^ oldflags) & (EXT4_APPEND_FL \| EXT4_IMMUTABLE_FL)) {
42a74f20 DH	71	if (!capable(CAP_LINUX_IMMUTABLE))
42a74f20 DH	72	goto flags_out;
ac27a0ec DK	73	}
	74
	75	/*
	76	* The JOURNAL_DATA flag can only be changed by
	77	* the relevant capability.
	78	*/
617ba13b	79	if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL)) {
42a74f20 DH	80	if (!capable(CAP_SYS_RESOURCE))
42a74f20 DH	81	goto flags_out;
ac27a0ec	82	}
4db46fc2 AK	83	if (oldflags & EXT4_EXTENTS_FL) {
	84	/* We don't support clearning extent flags */
	85	if (!(flags & EXT4_EXTENTS_FL)) {
	86	err = -EOPNOTSUPP;
	87	goto flags_out;
	88	}
	89	} else if (flags & EXT4_EXTENTS_FL) {
	90	/* migrate the file */
	91	migrate = 1;
	92	flags &= ~EXT4_EXTENTS_FL;
	93	}
ac27a0ec	94
c8d46e41 JZ	95	if (flags & EXT4_EOFBLOCKS_FL) {
	96	/* we don't support adding EOFBLOCKS flag */
	97	if (!(oldflags & EXT4_EOFBLOCKS_FL)) {
	98	err = -EOPNOTSUPP;
	99	goto flags_out;
	100	}
	101	} else if (oldflags & EXT4_EOFBLOCKS_FL)
	102	ext4_truncate(inode);
	103
617ba13b	104	handle = ext4_journal_start(inode, 1);
ac27a0ec	105	if (IS_ERR(handle)) {
42a74f20 DH	106	err = PTR_ERR(handle);
42a74f20 DH	107	goto flags_out;
ac27a0ec DK	108	}
ac27a0ec DK	109	if (IS_SYNC(inode))
0390131b	110	ext4_handle_sync(handle);
617ba13b	111	err = ext4_reserve_inode_write(handle, inode, &iloc);
ac27a0ec DK	112	if (err)
	113	goto flags_err;
	114
617ba13b MC	115	flags = flags & EXT4_FL_USER_MODIFIABLE;
617ba13b MC	116	flags \|= oldflags & ~EXT4_FL_USER_MODIFIABLE;
ac27a0ec DK	117	ei->i_flags = flags;
ac27a0ec DK	118
617ba13b	119	ext4_set_inode_flags(inode);
ef7f3835	120	inode->i_ctime = ext4_current_time(inode);
ac27a0ec	121
617ba13b	122	err = ext4_mark_iloc_dirty(handle, inode, &iloc);
ac27a0ec	123	flags_err:
617ba13b	124	ext4_journal_stop(handle);
42a74f20 DH	125	if (err)
42a74f20 DH	126	goto flags_out;
ac27a0ec	127
617ba13b MC	128	if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL))
617ba13b MC	129	err = ext4_change_inode_journal_flag(inode, jflag);
4db46fc2 AK	130	if (err)
	131	goto flags_out;
	132	if (migrate)
	133	err = ext4_ext_migrate(inode);
42a74f20	134	flags_out:
ac27a0ec	135	mutex_unlock(&inode->i_mutex);
42a74f20	136	mnt_drop_write(filp->f_path.mnt);
ac27a0ec DK	137	return err;
ac27a0ec DK	138	}
617ba13b MC	139	case EXT4_IOC_GETVERSION:
617ba13b MC	140	case EXT4_IOC_GETVERSION_OLD:
ac27a0ec	141	return put_user(inode->i_generation, (int __user *) arg);
617ba13b MC	142	case EXT4_IOC_SETVERSION:
617ba13b MC	143	case EXT4_IOC_SETVERSION_OLD: {
ac27a0ec	144	handle_t *handle;
617ba13b	145	struct ext4_iloc iloc;
ac27a0ec DK	146	__u32 generation;
	147	int err;
	148
3bd858ab	149	if (!is_owner_or_cap(inode))
ac27a0ec	150	return -EPERM;
42a74f20 DH	151
	152	err = mnt_want_write(filp->f_path.mnt);
	153	if (err)
	154	return err;
	155	if (get_user(generation, (int __user *) arg)) {
	156	err = -EFAULT;
	157	goto setversion_out;
	158	}
ac27a0ec	159
617ba13b	160	handle = ext4_journal_start(inode, 1);
42a74f20 DH	161	if (IS_ERR(handle)) {
	162	err = PTR_ERR(handle);
	163	goto setversion_out;
	164	}
617ba13b	165	err = ext4_reserve_inode_write(handle, inode, &iloc);
ac27a0ec	166	if (err == 0) {
ef7f3835	167	inode->i_ctime = ext4_current_time(inode);
ac27a0ec	168	inode->i_generation = generation;
617ba13b	169	err = ext4_mark_iloc_dirty(handle, inode, &iloc);
ac27a0ec	170	}
617ba13b	171	ext4_journal_stop(handle);
42a74f20 DH	172	setversion_out:
42a74f20 DH	173	mnt_drop_write(filp->f_path.mnt);
ac27a0ec DK	174	return err;
ac27a0ec DK	175	}
e23291b9	176	#ifdef CONFIG_JBD2_DEBUG
617ba13b	177	case EXT4_IOC_WAIT_FOR_READONLY:
ac27a0ec DK	178	/*
	179	* This is racy - by the time we're woken up and running,
	180	* the superblock could be released. And the module could
	181	* have been unloaded. So sue me.
	182	*
	183	* Returns 1 if it slept, else zero.
	184	*/
	185	{
	186	struct super_block *sb = inode->i_sb;
	187	DECLARE_WAITQUEUE(wait, current);
	188	int ret = 0;
	189
	190	set_current_state(TASK_INTERRUPTIBLE);
617ba13b MC	191	add_wait_queue(&EXT4_SB(sb)->ro_wait_queue, &wait);
617ba13b MC	192	if (timer_pending(&EXT4_SB(sb)->turn_ro_timer)) {
ac27a0ec DK	193	schedule();
	194	ret = 1;
	195	}
617ba13b	196	remove_wait_queue(&EXT4_SB(sb)->ro_wait_queue, &wait);
ac27a0ec DK	197	return ret;
	198	}
	199	#endif
617ba13b MC	200	case EXT4_IOC_GROUP_EXTEND: {
617ba13b MC	201	ext4_fsblk_t n_blocks_count;
ac27a0ec	202	struct super_block *sb = inode->i_sb;
ac046f1d	203	int err, err2=0;
ac27a0ec DK	204
	205	if (!capable(CAP_SYS_RESOURCE))
	206	return -EPERM;
	207
ac27a0ec DK	208	if (get_user(n_blocks_count, (__u32 __user *)arg))
	209	return -EFAULT;
	210
42a74f20 DH	211	err = mnt_want_write(filp->f_path.mnt);
	212	if (err)
	213	return err;
	214
617ba13b	215	err = ext4_group_extend(sb, EXT4_SB(sb)->s_es, n_blocks_count);
ac046f1d PT	216	if (EXT4_SB(sb)->s_journal) {
	217	jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
	218	err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
	219	jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
	220	}
7ffe1ea8 HK	221	if (err == 0)
7ffe1ea8 HK	222	err = err2;
42a74f20	223	mnt_drop_write(filp->f_path.mnt);
ac27a0ec DK	224
	225	return err;
	226	}
748de673 AF	227
	228	case EXT4_IOC_MOVE_EXT: {
	229	struct move_extent me;
	230	struct file *donor_filp;
	231	int err;
	232
4a58579b AF	233	if (!(filp->f_mode & FMODE_READ) \|\|
	234	!(filp->f_mode & FMODE_WRITE))
	235	return -EBADF;
	236
748de673 AF	237	if (copy_from_user(&me,
	238	(struct move_extent __user *)arg, sizeof(me)))
	239	return -EFAULT;
4a58579b	240	me.moved_len = 0;
748de673 AF	241
	242	donor_filp = fget(me.donor_fd);
	243	if (!donor_filp)
	244	return -EBADF;
	245
4a58579b AF	246	if (!(donor_filp->f_mode & FMODE_WRITE)) {
	247	err = -EBADF;
	248	goto mext_out;
748de673 AF	249	}
748de673 AF	250
4a58579b AF	251	err = mnt_want_write(filp->f_path.mnt);
	252	if (err)
	253	goto mext_out;
	254
748de673 AF	255	err = ext4_move_extents(filp, donor_filp, me.orig_start,
748de673 AF	256	me.donor_start, me.len, &me.moved_len);
4a58579b AF	257	mnt_drop_write(filp->f_path.mnt);
	258	if (me.moved_len > 0)
	259	file_remove_suid(donor_filp);
748de673	260
8d666913	261	if (copy_to_user((struct move_extent *)arg, &me, sizeof(me)))
4a58579b AF	262	err = -EFAULT;
	263	mext_out:
	264	fput(donor_filp);
748de673 AF	265	return err;
	266	}
	267
617ba13b MC	268	case EXT4_IOC_GROUP_ADD: {
617ba13b MC	269	struct ext4_new_group_data input;
ac27a0ec	270	struct super_block *sb = inode->i_sb;
ac046f1d	271	int err, err2=0;
ac27a0ec DK	272
	273	if (!capable(CAP_SYS_RESOURCE))
	274	return -EPERM;
	275
617ba13b	276	if (copy_from_user(&input, (struct ext4_new_group_input __user *)arg,
ac27a0ec DK	277	sizeof(input)))
	278	return -EFAULT;
	279
42a74f20 DH	280	err = mnt_want_write(filp->f_path.mnt);
	281	if (err)
	282	return err;
	283
617ba13b	284	err = ext4_group_add(sb, &input);
ac046f1d PT	285	if (EXT4_SB(sb)->s_journal) {
	286	jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
	287	err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
	288	jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
	289	}
7ffe1ea8 HK	290	if (err == 0)
7ffe1ea8 HK	291	err = err2;
42a74f20	292	mnt_drop_write(filp->f_path.mnt);
ac27a0ec DK	293
	294	return err;
	295	}
	296
c14c6fd5	297	case EXT4_IOC_MIGRATE:
2a43a878 AK	298	{
	299	int err;
	300	if (!is_owner_or_cap(inode))
	301	return -EACCES;
	302
	303	err = mnt_want_write(filp->f_path.mnt);
	304	if (err)
	305	return err;
	306	/*
	307	* inode_mutex prevent write and truncate on the file.
	308	* Read still goes through. We take i_data_sem in
	309	* ext4_ext_swap_inode_data before we switch the
	310	* inode format to prevent read.
	311	*/
	312	mutex_lock(&(inode->i_mutex));
	313	err = ext4_ext_migrate(inode);
	314	mutex_unlock(&(inode->i_mutex));
	315	mnt_drop_write(filp->f_path.mnt);
	316	return err;
	317	}
c14c6fd5	318
ccd2506b TT	319	case EXT4_IOC_ALLOC_DA_BLKS:
	320	{
	321	int err;
	322	if (!is_owner_or_cap(inode))
	323	return -EACCES;
	324
	325	err = mnt_want_write(filp->f_path.mnt);
	326	if (err)
	327	return err;
	328	err = ext4_alloc_da_blocks(inode);
	329	mnt_drop_write(filp->f_path.mnt);
	330	return err;
	331	}
	332
ac27a0ec DK	333	default:
	334	return -ENOTTY;
	335	}
	336	}
	337
	338	#ifdef CONFIG_COMPAT
617ba13b	339	long ext4_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
ac27a0ec	340	{
ac27a0ec DK	341	/* These are just misnamed, they actually get/put from/to user an int */
ac27a0ec DK	342	switch (cmd) {
617ba13b MC	343	case EXT4_IOC32_GETFLAGS:
617ba13b MC	344	cmd = EXT4_IOC_GETFLAGS;
ac27a0ec	345	break;
617ba13b MC	346	case EXT4_IOC32_SETFLAGS:
617ba13b MC	347	cmd = EXT4_IOC_SETFLAGS;
ac27a0ec	348	break;
617ba13b MC	349	case EXT4_IOC32_GETVERSION:
617ba13b MC	350	cmd = EXT4_IOC_GETVERSION;
ac27a0ec	351	break;
617ba13b MC	352	case EXT4_IOC32_SETVERSION:
617ba13b MC	353	cmd = EXT4_IOC_SETVERSION;
ac27a0ec	354	break;
617ba13b MC	355	case EXT4_IOC32_GROUP_EXTEND:
617ba13b MC	356	cmd = EXT4_IOC_GROUP_EXTEND;
ac27a0ec	357	break;
617ba13b MC	358	case EXT4_IOC32_GETVERSION_OLD:
617ba13b MC	359	cmd = EXT4_IOC_GETVERSION_OLD;
ac27a0ec	360	break;
617ba13b MC	361	case EXT4_IOC32_SETVERSION_OLD:
617ba13b MC	362	cmd = EXT4_IOC_SETVERSION_OLD;
ac27a0ec	363	break;
e23291b9	364	#ifdef CONFIG_JBD2_DEBUG
617ba13b MC	365	case EXT4_IOC32_WAIT_FOR_READONLY:
617ba13b MC	366	cmd = EXT4_IOC_WAIT_FOR_READONLY;
ac27a0ec DK	367	break;
ac27a0ec DK	368	#endif
617ba13b MC	369	case EXT4_IOC32_GETRSVSZ:
617ba13b MC	370	cmd = EXT4_IOC_GETRSVSZ;
ac27a0ec	371	break;
617ba13b MC	372	case EXT4_IOC32_SETRSVSZ:
617ba13b MC	373	cmd = EXT4_IOC_SETRSVSZ;
ac27a0ec	374	break;
617ba13b	375	case EXT4_IOC_GROUP_ADD:
ac27a0ec DK	376	break;
	377	default:
	378	return -ENOIOCTLCMD;
	379	}
5cdd7b2d	380	return ext4_ioctl(file, cmd, (unsigned long) compat_ptr(arg));
ac27a0ec DK	381	}
ac27a0ec DK	382	#endif