[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/smp_lock.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;
		}

		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;

		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);
		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 (copy_from_user(&me,
			(struct move_extent __user *)arg, sizeof(me)))
			return -EFAULT;

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

		if (!capable(CAP_DAC_OVERRIDE)) {
			if ((current->real_cred->fsuid != inode->i_uid) ||
				!(inode->i_mode & S_IRUSR) ||
				!(donor_filp->f_dentry->d_inode->i_mode &
				S_IRUSR)) {
				fput(donor_filp);
				return -EACCES;
			}
		}

		err = ext4_move_extents(filp, donor_filp, me.orig_start,
					me.donor_start, me.len, &me.moved_len);
		fput(donor_filp);

		if (!err)
			if (copy_to_user((struct move_extent *)arg,
				&me, sizeof(me)))
				return -EFAULT;
		return err;
	}

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

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