[net-next-2.6.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;
		}

		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>
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
617ba13b	95	handle = ext4_journal_start(inode, 1);
ac27a0ec	96	if (IS_ERR(handle)) {
42a74f20 DH	97	err = PTR_ERR(handle);
42a74f20 DH	98	goto flags_out;
ac27a0ec DK	99	}
ac27a0ec DK	100	if (IS_SYNC(inode))
0390131b	101	ext4_handle_sync(handle);
617ba13b	102	err = ext4_reserve_inode_write(handle, inode, &iloc);
ac27a0ec DK	103	if (err)
	104	goto flags_err;
	105
617ba13b MC	106	flags = flags & EXT4_FL_USER_MODIFIABLE;
617ba13b MC	107	flags \|= oldflags & ~EXT4_FL_USER_MODIFIABLE;
ac27a0ec DK	108	ei->i_flags = flags;
ac27a0ec DK	109
617ba13b	110	ext4_set_inode_flags(inode);
ef7f3835	111	inode->i_ctime = ext4_current_time(inode);
ac27a0ec	112
617ba13b	113	err = ext4_mark_iloc_dirty(handle, inode, &iloc);
ac27a0ec	114	flags_err:
617ba13b	115	ext4_journal_stop(handle);
42a74f20 DH	116	if (err)
42a74f20 DH	117	goto flags_out;
ac27a0ec	118
617ba13b MC	119	if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL))
617ba13b MC	120	err = ext4_change_inode_journal_flag(inode, jflag);
4db46fc2 AK	121	if (err)
	122	goto flags_out;
	123	if (migrate)
	124	err = ext4_ext_migrate(inode);
42a74f20	125	flags_out:
ac27a0ec	126	mutex_unlock(&inode->i_mutex);
42a74f20	127	mnt_drop_write(filp->f_path.mnt);
ac27a0ec DK	128	return err;
ac27a0ec DK	129	}
617ba13b MC	130	case EXT4_IOC_GETVERSION:
617ba13b MC	131	case EXT4_IOC_GETVERSION_OLD:
ac27a0ec	132	return put_user(inode->i_generation, (int __user *) arg);
617ba13b MC	133	case EXT4_IOC_SETVERSION:
617ba13b MC	134	case EXT4_IOC_SETVERSION_OLD: {
ac27a0ec	135	handle_t *handle;
617ba13b	136	struct ext4_iloc iloc;
ac27a0ec DK	137	__u32 generation;
	138	int err;
	139
3bd858ab	140	if (!is_owner_or_cap(inode))
ac27a0ec	141	return -EPERM;
42a74f20 DH	142
	143	err = mnt_want_write(filp->f_path.mnt);
	144	if (err)
	145	return err;
	146	if (get_user(generation, (int __user *) arg)) {
	147	err = -EFAULT;
	148	goto setversion_out;
	149	}
ac27a0ec	150
617ba13b	151	handle = ext4_journal_start(inode, 1);
42a74f20 DH	152	if (IS_ERR(handle)) {
	153	err = PTR_ERR(handle);
	154	goto setversion_out;
	155	}
617ba13b	156	err = ext4_reserve_inode_write(handle, inode, &iloc);
ac27a0ec	157	if (err == 0) {
ef7f3835	158	inode->i_ctime = ext4_current_time(inode);
ac27a0ec	159	inode->i_generation = generation;
617ba13b	160	err = ext4_mark_iloc_dirty(handle, inode, &iloc);
ac27a0ec	161	}
617ba13b	162	ext4_journal_stop(handle);
42a74f20 DH	163	setversion_out:
42a74f20 DH	164	mnt_drop_write(filp->f_path.mnt);
ac27a0ec DK	165	return err;
ac27a0ec DK	166	}
e23291b9	167	#ifdef CONFIG_JBD2_DEBUG
617ba13b	168	case EXT4_IOC_WAIT_FOR_READONLY:
ac27a0ec DK	169	/*
	170	* This is racy - by the time we're woken up and running,
	171	* the superblock could be released. And the module could
	172	* have been unloaded. So sue me.
	173	*
	174	* Returns 1 if it slept, else zero.
	175	*/
	176	{
	177	struct super_block *sb = inode->i_sb;
	178	DECLARE_WAITQUEUE(wait, current);
	179	int ret = 0;
	180
	181	set_current_state(TASK_INTERRUPTIBLE);
617ba13b MC	182	add_wait_queue(&EXT4_SB(sb)->ro_wait_queue, &wait);
617ba13b MC	183	if (timer_pending(&EXT4_SB(sb)->turn_ro_timer)) {
ac27a0ec DK	184	schedule();
	185	ret = 1;
	186	}
617ba13b	187	remove_wait_queue(&EXT4_SB(sb)->ro_wait_queue, &wait);
ac27a0ec DK	188	return ret;
	189	}
	190	#endif
617ba13b MC	191	case EXT4_IOC_GROUP_EXTEND: {
617ba13b MC	192	ext4_fsblk_t n_blocks_count;
ac27a0ec	193	struct super_block *sb = inode->i_sb;
7ffe1ea8	194	int err, err2;
ac27a0ec DK	195
	196	if (!capable(CAP_SYS_RESOURCE))
	197	return -EPERM;
	198
ac27a0ec DK	199	if (get_user(n_blocks_count, (__u32 __user *)arg))
	200	return -EFAULT;
	201
42a74f20 DH	202	err = mnt_want_write(filp->f_path.mnt);
	203	if (err)
	204	return err;
	205
617ba13b	206	err = ext4_group_extend(sb, EXT4_SB(sb)->s_es, n_blocks_count);
dab291af	207	jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
7ffe1ea8	208	err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
dab291af	209	jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
7ffe1ea8 HK	210	if (err == 0)
7ffe1ea8 HK	211	err = err2;
42a74f20	212	mnt_drop_write(filp->f_path.mnt);
ac27a0ec DK	213
	214	return err;
	215	}
748de673 AF	216
	217	case EXT4_IOC_MOVE_EXT: {
	218	struct move_extent me;
	219	struct file *donor_filp;
	220	int err;
	221
	222	if (copy_from_user(&me,
	223	(struct move_extent __user *)arg, sizeof(me)))
	224	return -EFAULT;
	225
	226	donor_filp = fget(me.donor_fd);
	227	if (!donor_filp)
	228	return -EBADF;
	229
	230	if (!capable(CAP_DAC_OVERRIDE)) {
	231	if ((current->real_cred->fsuid != inode->i_uid) \|\|
	232	!(inode->i_mode & S_IRUSR) \|\|
	233	!(donor_filp->f_dentry->d_inode->i_mode &
	234	S_IRUSR)) {
	235	fput(donor_filp);
	236	return -EACCES;
	237	}
	238	}
	239
	240	err = ext4_move_extents(filp, donor_filp, me.orig_start,
	241	me.donor_start, me.len, &me.moved_len);
	242	fput(donor_filp);
	243
	244	if (!err)
	245	if (copy_to_user((struct move_extent *)arg,
	246	&me, sizeof(me)))
	247	return -EFAULT;
	248	return err;
	249	}
	250
617ba13b MC	251	case EXT4_IOC_GROUP_ADD: {
617ba13b MC	252	struct ext4_new_group_data input;
ac27a0ec	253	struct super_block *sb = inode->i_sb;
7ffe1ea8	254	int err, err2;
ac27a0ec DK	255
	256	if (!capable(CAP_SYS_RESOURCE))
	257	return -EPERM;
	258
617ba13b	259	if (copy_from_user(&input, (struct ext4_new_group_input __user *)arg,
ac27a0ec DK	260	sizeof(input)))
	261	return -EFAULT;
	262
42a74f20 DH	263	err = mnt_want_write(filp->f_path.mnt);
	264	if (err)
	265	return err;
	266
617ba13b	267	err = ext4_group_add(sb, &input);
dab291af	268	jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
7ffe1ea8	269	err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
dab291af	270	jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
7ffe1ea8 HK	271	if (err == 0)
7ffe1ea8 HK	272	err = err2;
42a74f20	273	mnt_drop_write(filp->f_path.mnt);
ac27a0ec DK	274
	275	return err;
	276	}
	277
c14c6fd5	278	case EXT4_IOC_MIGRATE:
2a43a878 AK	279	{
	280	int err;
	281	if (!is_owner_or_cap(inode))
	282	return -EACCES;
	283
	284	err = mnt_want_write(filp->f_path.mnt);
	285	if (err)
	286	return err;
	287	/*
	288	* inode_mutex prevent write and truncate on the file.
	289	* Read still goes through. We take i_data_sem in
	290	* ext4_ext_swap_inode_data before we switch the
	291	* inode format to prevent read.
	292	*/
	293	mutex_lock(&(inode->i_mutex));
	294	err = ext4_ext_migrate(inode);
	295	mutex_unlock(&(inode->i_mutex));
	296	mnt_drop_write(filp->f_path.mnt);
	297	return err;
	298	}
c14c6fd5	299
ccd2506b TT	300	case EXT4_IOC_ALLOC_DA_BLKS:
	301	{
	302	int err;
	303	if (!is_owner_or_cap(inode))
	304	return -EACCES;
	305
	306	err = mnt_want_write(filp->f_path.mnt);
	307	if (err)
	308	return err;
	309	err = ext4_alloc_da_blocks(inode);
	310	mnt_drop_write(filp->f_path.mnt);
	311	return err;
	312	}
	313
ac27a0ec DK	314	default:
	315	return -ENOTTY;
	316	}
	317	}
	318
	319	#ifdef CONFIG_COMPAT
617ba13b	320	long ext4_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
ac27a0ec	321	{
ac27a0ec DK	322	/* These are just misnamed, they actually get/put from/to user an int */
ac27a0ec DK	323	switch (cmd) {
617ba13b MC	324	case EXT4_IOC32_GETFLAGS:
617ba13b MC	325	cmd = EXT4_IOC_GETFLAGS;
ac27a0ec	326	break;
617ba13b MC	327	case EXT4_IOC32_SETFLAGS:
617ba13b MC	328	cmd = EXT4_IOC_SETFLAGS;
ac27a0ec	329	break;
617ba13b MC	330	case EXT4_IOC32_GETVERSION:
617ba13b MC	331	cmd = EXT4_IOC_GETVERSION;
ac27a0ec	332	break;
617ba13b MC	333	case EXT4_IOC32_SETVERSION:
617ba13b MC	334	cmd = EXT4_IOC_SETVERSION;
ac27a0ec	335	break;
617ba13b MC	336	case EXT4_IOC32_GROUP_EXTEND:
617ba13b MC	337	cmd = EXT4_IOC_GROUP_EXTEND;
ac27a0ec	338	break;
617ba13b MC	339	case EXT4_IOC32_GETVERSION_OLD:
617ba13b MC	340	cmd = EXT4_IOC_GETVERSION_OLD;
ac27a0ec	341	break;
617ba13b MC	342	case EXT4_IOC32_SETVERSION_OLD:
617ba13b MC	343	cmd = EXT4_IOC_SETVERSION_OLD;
ac27a0ec	344	break;
e23291b9	345	#ifdef CONFIG_JBD2_DEBUG
617ba13b MC	346	case EXT4_IOC32_WAIT_FOR_READONLY:
617ba13b MC	347	cmd = EXT4_IOC_WAIT_FOR_READONLY;
ac27a0ec DK	348	break;
ac27a0ec DK	349	#endif
617ba13b MC	350	case EXT4_IOC32_GETRSVSZ:
617ba13b MC	351	cmd = EXT4_IOC_GETRSVSZ;
ac27a0ec	352	break;
617ba13b MC	353	case EXT4_IOC32_SETRSVSZ:
617ba13b MC	354	cmd = EXT4_IOC_SETRSVSZ;
ac27a0ec	355	break;
617ba13b	356	case EXT4_IOC_GROUP_ADD:
ac27a0ec DK	357	break;
	358	default:
	359	return -ENOIOCTLCMD;
	360	}
5cdd7b2d	361	return ext4_ioctl(file, cmd, (unsigned long) compat_ptr(arg));
ac27a0ec DK	362	}
ac27a0ec DK	363	#endif