[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/smp_lock.h>
#include <linux/mount.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;
	unsigned short rsv_window_size;

	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;
		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;

		if (!S_ISDIR(inode->i_mode))
			flags &= ~EXT4_DIRSYNC_FL;

		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;
		}

		handle = ext4_journal_start(inode, 1);
		if (IS_ERR(handle)) {
			err = PTR_ERR(handle);
			goto flags_out;
		}
		if (IS_SYNC(inode))
			handle->h_sync = 1;
		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);
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_GETRSVSZ:
		if (test_opt(inode->i_sb, RESERVATION)
			&& S_ISREG(inode->i_mode)
			&& ei->i_block_alloc_info) {
			rsv_window_size = ei->i_block_alloc_info->rsv_window_node.rsv_goal_size;
			return put_user(rsv_window_size, (int __user *)arg);
		}
		return -ENOTTY;
	case EXT4_IOC_SETRSVSZ: {
		int err;

		if (!test_opt(inode->i_sb, RESERVATION) || !S_ISREG(inode->i_mode))
			return -ENOTTY;

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

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

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

		if (rsv_window_size > EXT4_MAX_RESERVE_BLOCKS)
			rsv_window_size = EXT4_MAX_RESERVE_BLOCKS;

		/*
		 * need to allocate reservation structure for this inode
		 * before set the window size
		 */
		down_write(&ei->i_data_sem);
		if (!ei->i_block_alloc_info)
			ext4_init_block_alloc_info(inode);

		if (ei->i_block_alloc_info){
			struct ext4_reserve_window_node *rsv = &ei->i_block_alloc_info->rsv_window_node;
			rsv->rsv_goal_size = rsv_window_size;
		}
		up_write(&ei->i_data_sem);
		mnt_drop_write(filp->f_path.mnt);
		return 0;
	}
	case EXT4_IOC_GROUP_EXTEND: {
		ext4_fsblk_t n_blocks_count;
		struct super_block *sb = inode->i_sb;
		int err;

		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);
		jbd2_journal_flush(EXT4_SB(sb)->s_journal);
		jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
		mnt_drop_write(filp->f_path.mnt);

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

		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);
		jbd2_journal_flush(EXT4_SB(sb)->s_journal);
		jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
		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;
	}

	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>
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 DK	25	unsigned int flags;
	26	unsigned short rsv_window_size;
	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 DK	36	handle_t *handle = NULL;
ac27a0ec DK	37	int err;
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
ac27a0ec	52	if (!S_ISDIR(inode->i_mode))
617ba13b	53	flags &= ~EXT4_DIRSYNC_FL;
ac27a0ec	54
42a74f20	55	err = -EPERM;
ac27a0ec	56	mutex_lock(&inode->i_mutex);
e47776a0	57	/* Is it quota file? Do not allow user to mess with it */
42a74f20 DH	58	if (IS_NOQUOTA(inode))
	59	goto flags_out;
	60
ac27a0ec DK	61	oldflags = ei->i_flags;
	62
	63	/* The JOURNAL_DATA flag is modifiable only by root */
617ba13b	64	jflag = flags & EXT4_JOURNAL_DATA_FL;
ac27a0ec DK	65
	66	/*
	67	* The IMMUTABLE and APPEND_ONLY flags can only be changed by
	68	* the relevant capability.
	69	*
	70	* This test looks nicer. Thanks to Pauline Middelink
	71	*/
617ba13b	72	if ((flags ^ oldflags) & (EXT4_APPEND_FL \| EXT4_IMMUTABLE_FL)) {
42a74f20 DH	73	if (!capable(CAP_LINUX_IMMUTABLE))
42a74f20 DH	74	goto flags_out;
ac27a0ec DK	75	}
	76
	77	/*
	78	* The JOURNAL_DATA flag can only be changed by
	79	* the relevant capability.
	80	*/
617ba13b	81	if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL)) {
42a74f20 DH	82	if (!capable(CAP_SYS_RESOURCE))
42a74f20 DH	83	goto flags_out;
ac27a0ec DK	84	}
ac27a0ec DK	85
617ba13b	86	handle = ext4_journal_start(inode, 1);
ac27a0ec	87	if (IS_ERR(handle)) {
42a74f20 DH	88	err = PTR_ERR(handle);
42a74f20 DH	89	goto flags_out;
ac27a0ec DK	90	}
	91	if (IS_SYNC(inode))
	92	handle->h_sync = 1;
617ba13b	93	err = ext4_reserve_inode_write(handle, inode, &iloc);
ac27a0ec DK	94	if (err)
	95	goto flags_err;
	96
617ba13b MC	97	flags = flags & EXT4_FL_USER_MODIFIABLE;
617ba13b MC	98	flags \|= oldflags & ~EXT4_FL_USER_MODIFIABLE;
ac27a0ec DK	99	ei->i_flags = flags;
ac27a0ec DK	100
617ba13b	101	ext4_set_inode_flags(inode);
ef7f3835	102	inode->i_ctime = ext4_current_time(inode);
ac27a0ec	103
617ba13b	104	err = ext4_mark_iloc_dirty(handle, inode, &iloc);
ac27a0ec	105	flags_err:
617ba13b	106	ext4_journal_stop(handle);
42a74f20 DH	107	if (err)
42a74f20 DH	108	goto flags_out;
ac27a0ec	109
617ba13b MC	110	if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL))
617ba13b MC	111	err = ext4_change_inode_journal_flag(inode, jflag);
42a74f20	112	flags_out:
ac27a0ec	113	mutex_unlock(&inode->i_mutex);
42a74f20	114	mnt_drop_write(filp->f_path.mnt);
ac27a0ec DK	115	return err;
ac27a0ec DK	116	}
617ba13b MC	117	case EXT4_IOC_GETVERSION:
617ba13b MC	118	case EXT4_IOC_GETVERSION_OLD:
ac27a0ec	119	return put_user(inode->i_generation, (int __user *) arg);
617ba13b MC	120	case EXT4_IOC_SETVERSION:
617ba13b MC	121	case EXT4_IOC_SETVERSION_OLD: {
ac27a0ec	122	handle_t *handle;
617ba13b	123	struct ext4_iloc iloc;
ac27a0ec DK	124	__u32 generation;
	125	int err;
	126
3bd858ab	127	if (!is_owner_or_cap(inode))
ac27a0ec	128	return -EPERM;
42a74f20 DH	129
	130	err = mnt_want_write(filp->f_path.mnt);
	131	if (err)
	132	return err;
	133	if (get_user(generation, (int __user *) arg)) {
	134	err = -EFAULT;
	135	goto setversion_out;
	136	}
ac27a0ec	137
617ba13b	138	handle = ext4_journal_start(inode, 1);
42a74f20 DH	139	if (IS_ERR(handle)) {
	140	err = PTR_ERR(handle);
	141	goto setversion_out;
	142	}
617ba13b	143	err = ext4_reserve_inode_write(handle, inode, &iloc);
ac27a0ec	144	if (err == 0) {
ef7f3835	145	inode->i_ctime = ext4_current_time(inode);
ac27a0ec	146	inode->i_generation = generation;
617ba13b	147	err = ext4_mark_iloc_dirty(handle, inode, &iloc);
ac27a0ec	148	}
617ba13b	149	ext4_journal_stop(handle);
42a74f20 DH	150	setversion_out:
42a74f20 DH	151	mnt_drop_write(filp->f_path.mnt);
ac27a0ec DK	152	return err;
ac27a0ec DK	153	}
e23291b9	154	#ifdef CONFIG_JBD2_DEBUG
617ba13b	155	case EXT4_IOC_WAIT_FOR_READONLY:
ac27a0ec DK	156	/*
	157	* This is racy - by the time we're woken up and running,
	158	* the superblock could be released. And the module could
	159	* have been unloaded. So sue me.
	160	*
	161	* Returns 1 if it slept, else zero.
	162	*/
	163	{
	164	struct super_block *sb = inode->i_sb;
	165	DECLARE_WAITQUEUE(wait, current);
	166	int ret = 0;
	167
	168	set_current_state(TASK_INTERRUPTIBLE);
617ba13b MC	169	add_wait_queue(&EXT4_SB(sb)->ro_wait_queue, &wait);
617ba13b MC	170	if (timer_pending(&EXT4_SB(sb)->turn_ro_timer)) {
ac27a0ec DK	171	schedule();
	172	ret = 1;
	173	}
617ba13b	174	remove_wait_queue(&EXT4_SB(sb)->ro_wait_queue, &wait);
ac27a0ec DK	175	return ret;
	176	}
	177	#endif
617ba13b	178	case EXT4_IOC_GETRSVSZ:
ac27a0ec DK	179	if (test_opt(inode->i_sb, RESERVATION)
	180	&& S_ISREG(inode->i_mode)
	181	&& ei->i_block_alloc_info) {
	182	rsv_window_size = ei->i_block_alloc_info->rsv_window_node.rsv_goal_size;
	183	return put_user(rsv_window_size, (int __user *)arg);
	184	}
	185	return -ENOTTY;
617ba13b	186	case EXT4_IOC_SETRSVSZ: {
42a74f20	187	int err;
ac27a0ec	188
af5bc92d	189	if (!test_opt(inode->i_sb, RESERVATION) \|\| !S_ISREG(inode->i_mode))
ac27a0ec DK	190	return -ENOTTY;
ac27a0ec DK	191
3bd858ab	192	if (!is_owner_or_cap(inode))
ac27a0ec DK	193	return -EACCES;
	194
	195	if (get_user(rsv_window_size, (int __user *)arg))
	196	return -EFAULT;
	197
42a74f20 DH	198	err = mnt_want_write(filp->f_path.mnt);
	199	if (err)
	200	return err;
	201
617ba13b MC	202	if (rsv_window_size > EXT4_MAX_RESERVE_BLOCKS)
617ba13b MC	203	rsv_window_size = EXT4_MAX_RESERVE_BLOCKS;
ac27a0ec DK	204
	205	/*
	206	* need to allocate reservation structure for this inode
	207	* before set the window size
	208	*/
0e855ac8	209	down_write(&ei->i_data_sem);
ac27a0ec	210	if (!ei->i_block_alloc_info)
617ba13b	211	ext4_init_block_alloc_info(inode);
ac27a0ec DK	212
ac27a0ec DK	213	if (ei->i_block_alloc_info){
617ba13b	214	struct ext4_reserve_window_node *rsv = &ei->i_block_alloc_info->rsv_window_node;
ac27a0ec DK	215	rsv->rsv_goal_size = rsv_window_size;
ac27a0ec DK	216	}
0e855ac8	217	up_write(&ei->i_data_sem);
42a74f20	218	mnt_drop_write(filp->f_path.mnt);
ac27a0ec DK	219	return 0;
ac27a0ec DK	220	}
617ba13b MC	221	case EXT4_IOC_GROUP_EXTEND: {
617ba13b MC	222	ext4_fsblk_t n_blocks_count;
ac27a0ec DK	223	struct super_block *sb = inode->i_sb;
	224	int err;
	225
	226	if (!capable(CAP_SYS_RESOURCE))
	227	return -EPERM;
	228
ac27a0ec DK	229	if (get_user(n_blocks_count, (__u32 __user *)arg))
	230	return -EFAULT;
	231
42a74f20 DH	232	err = mnt_want_write(filp->f_path.mnt);
	233	if (err)
	234	return err;
	235
617ba13b	236	err = ext4_group_extend(sb, EXT4_SB(sb)->s_es, n_blocks_count);
dab291af MC	237	jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
	238	jbd2_journal_flush(EXT4_SB(sb)->s_journal);
	239	jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
42a74f20	240	mnt_drop_write(filp->f_path.mnt);
ac27a0ec DK	241
	242	return err;
	243	}
617ba13b MC	244	case EXT4_IOC_GROUP_ADD: {
617ba13b MC	245	struct ext4_new_group_data input;
ac27a0ec DK	246	struct super_block *sb = inode->i_sb;
	247	int err;
	248
	249	if (!capable(CAP_SYS_RESOURCE))
	250	return -EPERM;
	251
617ba13b	252	if (copy_from_user(&input, (struct ext4_new_group_input __user *)arg,
ac27a0ec DK	253	sizeof(input)))
	254	return -EFAULT;
	255
42a74f20 DH	256	err = mnt_want_write(filp->f_path.mnt);
	257	if (err)
	258	return err;
	259
617ba13b	260	err = ext4_group_add(sb, &input);
dab291af MC	261	jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
	262	jbd2_journal_flush(EXT4_SB(sb)->s_journal);
	263	jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
42a74f20	264	mnt_drop_write(filp->f_path.mnt);
ac27a0ec DK	265
	266	return err;
	267	}
	268
c14c6fd5	269	case EXT4_IOC_MIGRATE:
2a43a878 AK	270	{
	271	int err;
	272	if (!is_owner_or_cap(inode))
	273	return -EACCES;
	274
	275	err = mnt_want_write(filp->f_path.mnt);
	276	if (err)
	277	return err;
	278	/*
	279	* inode_mutex prevent write and truncate on the file.
	280	* Read still goes through. We take i_data_sem in
	281	* ext4_ext_swap_inode_data before we switch the
	282	* inode format to prevent read.
	283	*/
	284	mutex_lock(&(inode->i_mutex));
	285	err = ext4_ext_migrate(inode);
	286	mutex_unlock(&(inode->i_mutex));
	287	mnt_drop_write(filp->f_path.mnt);
	288	return err;
	289	}
c14c6fd5	290
ac27a0ec DK	291	default:
	292	return -ENOTTY;
	293	}
	294	}
	295
	296	#ifdef CONFIG_COMPAT
617ba13b	297	long ext4_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
ac27a0ec	298	{
ac27a0ec DK	299	/* These are just misnamed, they actually get/put from/to user an int */
ac27a0ec DK	300	switch (cmd) {
617ba13b MC	301	case EXT4_IOC32_GETFLAGS:
617ba13b MC	302	cmd = EXT4_IOC_GETFLAGS;
ac27a0ec	303	break;
617ba13b MC	304	case EXT4_IOC32_SETFLAGS:
617ba13b MC	305	cmd = EXT4_IOC_SETFLAGS;
ac27a0ec	306	break;
617ba13b MC	307	case EXT4_IOC32_GETVERSION:
617ba13b MC	308	cmd = EXT4_IOC_GETVERSION;
ac27a0ec	309	break;
617ba13b MC	310	case EXT4_IOC32_SETVERSION:
617ba13b MC	311	cmd = EXT4_IOC_SETVERSION;
ac27a0ec	312	break;
617ba13b MC	313	case EXT4_IOC32_GROUP_EXTEND:
617ba13b MC	314	cmd = EXT4_IOC_GROUP_EXTEND;
ac27a0ec	315	break;
617ba13b MC	316	case EXT4_IOC32_GETVERSION_OLD:
617ba13b MC	317	cmd = EXT4_IOC_GETVERSION_OLD;
ac27a0ec	318	break;
617ba13b MC	319	case EXT4_IOC32_SETVERSION_OLD:
617ba13b MC	320	cmd = EXT4_IOC_SETVERSION_OLD;
ac27a0ec	321	break;
e23291b9	322	#ifdef CONFIG_JBD2_DEBUG
617ba13b MC	323	case EXT4_IOC32_WAIT_FOR_READONLY:
617ba13b MC	324	cmd = EXT4_IOC_WAIT_FOR_READONLY;
ac27a0ec DK	325	break;
ac27a0ec DK	326	#endif
617ba13b MC	327	case EXT4_IOC32_GETRSVSZ:
617ba13b MC	328	cmd = EXT4_IOC_GETRSVSZ;
ac27a0ec	329	break;
617ba13b MC	330	case EXT4_IOC32_SETRSVSZ:
617ba13b MC	331	cmd = EXT4_IOC_SETRSVSZ;
ac27a0ec	332	break;
617ba13b	333	case EXT4_IOC_GROUP_ADD:
ac27a0ec DK	334	break;
	335	default:
	336	return -ENOIOCTLCMD;
	337	}
5cdd7b2d	338	return ext4_ioctl(file, cmd, (unsigned long) compat_ptr(arg));
ac27a0ec DK	339	}
ac27a0ec DK	340	#endif