[linux-2.6-block.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"

#define MAX_32_NUM ((((unsigned long long) 1) << 32) - 1)

long ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
{
	struct inode *inode = filp->f_dentry->d_inode;
	struct super_block *sb = inode->i_sb;
	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, mask, i;
		unsigned int jflag;

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

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

		err = mnt_want_write_file(filp);
		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;

		for (i = 0, mask = 1; i < 32; i++, mask <<= 1) {
			if (!(mask & EXT4_FL_USER_MODIFIABLE))
				continue;
			if (mask & flags)
				ext4_set_inode_flag(inode, i);
			else
				ext4_clear_inode_flag(inode, i);
		}

		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_file(filp);
		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 (!inode_owner_or_capable(inode))
			return -EPERM;

		if (EXT4_HAS_RO_COMPAT_FEATURE(inode->i_sb,
				EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) {
			ext4_warning(sb, "Setting inode version is not "
				     "supported with metadata_csum enabled.");
			return -ENOTTY;
		}

		err = mnt_want_write_file(filp);
		if (err)
			return err;
		if (get_user(generation, (int __user *) arg)) {
			err = -EFAULT;
			goto setversion_out;
		}

		mutex_lock(&inode->i_mutex);
		handle = ext4_journal_start(inode, 1);
		if (IS_ERR(handle)) {
			err = PTR_ERR(handle);
			goto unlock_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);

unlock_out:
		mutex_unlock(&inode->i_mutex);
setversion_out:
		mnt_drop_write_file(filp);
		return err;
	}
	case EXT4_IOC_GROUP_EXTEND: {
		ext4_fsblk_t n_blocks_count;
		int err, err2=0;

		err = ext4_resize_begin(sb);
		if (err)
			return err;

		if (get_user(n_blocks_count, (__u32 __user *)arg)) {
			err = -EFAULT;
			goto group_extend_out;
		}

		if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
			       EXT4_FEATURE_RO_COMPAT_BIGALLOC)) {
			ext4_msg(sb, KERN_ERR,
				 "Online resizing not supported with bigalloc");
			err = -EOPNOTSUPP;
			goto group_extend_out;
		}

		err = mnt_want_write_file(filp);
		if (err)
			goto group_extend_out;

		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_file(filp);
group_extend_out:
		ext4_resize_end(sb);
		return err;
	}

	case EXT4_IOC_MOVE_EXT: {
		struct move_extent me;
		struct fd donor;
		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 = fdget(me.donor_fd);
		if (!donor.file)
			return -EBADF;

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

		if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
			       EXT4_FEATURE_RO_COMPAT_BIGALLOC)) {
			ext4_msg(sb, KERN_ERR,
				 "Online defrag not supported with bigalloc");
			err = -EOPNOTSUPP;
			goto mext_out;
		}

		err = mnt_want_write_file(filp);
		if (err)
			goto mext_out;

		err = ext4_move_extents(filp, donor.file, me.orig_start,
					me.donor_start, me.len, &me.moved_len);
		mnt_drop_write_file(filp);

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

	case EXT4_IOC_GROUP_ADD: {
		struct ext4_new_group_data input;
		int err, err2=0;

		err = ext4_resize_begin(sb);
		if (err)
			return err;

		if (copy_from_user(&input, (struct ext4_new_group_input __user *)arg,
				sizeof(input))) {
			err = -EFAULT;
			goto group_add_out;
		}

		if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
			       EXT4_FEATURE_RO_COMPAT_BIGALLOC)) {
			ext4_msg(sb, KERN_ERR,
				 "Online resizing not supported with bigalloc");
			err = -EOPNOTSUPP;
			goto group_add_out;
		}

		err = mnt_want_write_file(filp);
		if (err)
			goto group_add_out;

		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_file(filp);
group_add_out:
		ext4_resize_end(sb);
		return err;
	}

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

		err = mnt_want_write_file(filp);
		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_file(filp);
		return err;
	}

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

		err = mnt_want_write_file(filp);
		if (err)
			return err;
		err = ext4_alloc_da_blocks(inode);
		mnt_drop_write_file(filp);
		return err;
	}

	case EXT4_IOC_RESIZE_FS: {
		ext4_fsblk_t n_blocks_count;
		struct super_block *sb = inode->i_sb;
		int err = 0, err2 = 0;

		if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
			       EXT4_FEATURE_RO_COMPAT_BIGALLOC)) {
			ext4_msg(sb, KERN_ERR,
				 "Online resizing not (yet) supported with bigalloc");
			return -EOPNOTSUPP;
		}

		if (EXT4_HAS_INCOMPAT_FEATURE(sb,
			       EXT4_FEATURE_INCOMPAT_META_BG)) {
			ext4_msg(sb, KERN_ERR,
				 "Online resizing not (yet) supported with meta_bg");
			return -EOPNOTSUPP;
		}

		if (copy_from_user(&n_blocks_count, (__u64 __user *)arg,
				   sizeof(__u64))) {
			return -EFAULT;
		}

		if (n_blocks_count > MAX_32_NUM &&
		    !EXT4_HAS_INCOMPAT_FEATURE(sb,
					       EXT4_FEATURE_INCOMPAT_64BIT)) {
			ext4_msg(sb, KERN_ERR,
				 "File system only supports 32-bit block numbers");
			return -EOPNOTSUPP;
		}

		err = ext4_resize_begin(sb);
		if (err)
			return err;

		err = mnt_want_write_file(filp);
		if (err)
			goto resizefs_out;

		err = ext4_resize_fs(sb, 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_file(filp);
resizefs_out:
		ext4_resize_end(sb);
		return err;
	}

	case FITRIM:
	{
		struct request_queue *q = bdev_get_queue(sb->s_bdev);
		struct fstrim_range range;
		int ret = 0;

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

		if (!blk_queue_discard(q))
			return -EOPNOTSUPP;

		if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
			       EXT4_FEATURE_RO_COMPAT_BIGALLOC)) {
			ext4_msg(sb, KERN_ERR,
				 "FITRIM not supported with bigalloc");
			return -EOPNOTSUPP;
		}

		if (copy_from_user(&range, (struct fstrim_range __user *)arg,
		    sizeof(range)))
			return -EFAULT;

		range.minlen = max((unsigned int)range.minlen,
				   q->limits.discard_granularity);
		ret = ext4_trim_fs(sb, &range);
		if (ret < 0)
			return ret;

		if (copy_to_user((struct fstrim_range __user *)arg, &range,
		    sizeof(range)))
			return -EFAULT;

		return 0;
	}

	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;
	case EXT4_IOC32_GETRSVSZ:
		cmd = EXT4_IOC_GETRSVSZ;
		break;
	case EXT4_IOC32_SETRSVSZ:
		cmd = EXT4_IOC_SETRSVSZ;
		break;
	case EXT4_IOC32_GROUP_ADD: {
		struct compat_ext4_new_group_input __user *uinput;
		struct ext4_new_group_input input;
		mm_segment_t old_fs;
		int err;

		uinput = compat_ptr(arg);
		err = get_user(input.group, &uinput->group);
		err |= get_user(input.block_bitmap, &uinput->block_bitmap);
		err |= get_user(input.inode_bitmap, &uinput->inode_bitmap);
		err |= get_user(input.inode_table, &uinput->inode_table);
		err |= get_user(input.blocks_count, &uinput->blocks_count);
		err |= get_user(input.reserved_blocks,
				&uinput->reserved_blocks);
		if (err)
			return -EFAULT;
		old_fs = get_fs();
		set_fs(KERNEL_DS);
		err = ext4_ioctl(file, EXT4_IOC_GROUP_ADD,
				 (unsigned long) &input);
		set_fs(old_fs);
		return err;
	}
	case EXT4_IOC_MOVE_EXT:
	case FITRIM:
	case EXT4_IOC_RESIZE_FS:
		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
19c5246d YY	21	#define MAX_32_NUM ((((unsigned long long) 1) << 32) - 1)
19c5246d YY	22
5cdd7b2d	23	long ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
ac27a0ec	24	{
5cdd7b2d	25	struct inode *inode = filp->f_dentry->d_inode;
bab08ab9	26	struct super_block *sb = inode->i_sb;
617ba13b	27	struct ext4_inode_info *ei = EXT4_I(inode);
ac27a0ec	28	unsigned int flags;
ac27a0ec	29
af5bc92d	30	ext4_debug("cmd = %u, arg = %lu\n", cmd, arg);
ac27a0ec DK	31
ac27a0ec DK	32	switch (cmd) {
617ba13b	33	case EXT4_IOC_GETFLAGS:
ff9ddf7e	34	ext4_get_inode_flags(ei);
617ba13b	35	flags = ei->i_flags & EXT4_FL_USER_VISIBLE;
ac27a0ec	36	return put_user(flags, (int __user *) arg);
617ba13b	37	case EXT4_IOC_SETFLAGS: {
ac27a0ec	38	handle_t *handle = NULL;
4db46fc2	39	int err, migrate = 0;
617ba13b	40	struct ext4_iloc iloc;
79906964	41	unsigned int oldflags, mask, i;
ac27a0ec DK	42	unsigned int jflag;
ac27a0ec DK	43
2e149670	44	if (!inode_owner_or_capable(inode))
ac27a0ec DK	45	return -EACCES;
	46
	47	if (get_user(flags, (int __user *) arg))
	48	return -EFAULT;
	49
a561be71	50	err = mnt_want_write_file(filp);
42a74f20 DH	51	if (err)
	52	return err;
	53
2dc6b0d4	54	flags = ext4_mask_flags(inode->i_mode, flags);
ac27a0ec	55
42a74f20	56	err = -EPERM;
ac27a0ec	57	mutex_lock(&inode->i_mutex);
e47776a0	58	/* Is it quota file? Do not allow user to mess with it */
42a74f20 DH	59	if (IS_NOQUOTA(inode))
	60	goto flags_out;
	61
ac27a0ec DK	62	oldflags = ei->i_flags;
	63
	64	/* The JOURNAL_DATA flag is modifiable only by root */
617ba13b	65	jflag = flags & EXT4_JOURNAL_DATA_FL;
ac27a0ec DK	66
	67	/*
	68	* The IMMUTABLE and APPEND_ONLY flags can only be changed by
	69	* the relevant capability.
	70	*
	71	* This test looks nicer. Thanks to Pauline Middelink
	72	*/
617ba13b	73	if ((flags ^ oldflags) & (EXT4_APPEND_FL \| EXT4_IMMUTABLE_FL)) {
42a74f20 DH	74	if (!capable(CAP_LINUX_IMMUTABLE))
42a74f20 DH	75	goto flags_out;
ac27a0ec DK	76	}
	77
	78	/*
	79	* The JOURNAL_DATA flag can only be changed by
	80	* the relevant capability.
	81	*/
617ba13b	82	if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL)) {
42a74f20 DH	83	if (!capable(CAP_SYS_RESOURCE))
42a74f20 DH	84	goto flags_out;
ac27a0ec	85	}
4db46fc2 AK	86	if (oldflags & EXT4_EXTENTS_FL) {
	87	/* We don't support clearning extent flags */
	88	if (!(flags & EXT4_EXTENTS_FL)) {
	89	err = -EOPNOTSUPP;
	90	goto flags_out;
	91	}
	92	} else if (flags & EXT4_EXTENTS_FL) {
	93	/* migrate the file */
	94	migrate = 1;
	95	flags &= ~EXT4_EXTENTS_FL;
	96	}
ac27a0ec	97
c8d46e41 JZ	98	if (flags & EXT4_EOFBLOCKS_FL) {
	99	/* we don't support adding EOFBLOCKS flag */
	100	if (!(oldflags & EXT4_EOFBLOCKS_FL)) {
	101	err = -EOPNOTSUPP;
	102	goto flags_out;
	103	}
	104	} else if (oldflags & EXT4_EOFBLOCKS_FL)
	105	ext4_truncate(inode);
	106
617ba13b	107	handle = ext4_journal_start(inode, 1);
ac27a0ec	108	if (IS_ERR(handle)) {
42a74f20 DH	109	err = PTR_ERR(handle);
42a74f20 DH	110	goto flags_out;
ac27a0ec DK	111	}
ac27a0ec DK	112	if (IS_SYNC(inode))
0390131b	113	ext4_handle_sync(handle);
617ba13b	114	err = ext4_reserve_inode_write(handle, inode, &iloc);
ac27a0ec DK	115	if (err)
	116	goto flags_err;
	117
79906964 TT	118	for (i = 0, mask = 1; i < 32; i++, mask <<= 1) {
	119	if (!(mask & EXT4_FL_USER_MODIFIABLE))
	120	continue;
	121	if (mask & flags)
	122	ext4_set_inode_flag(inode, i);
	123	else
	124	ext4_clear_inode_flag(inode, i);
	125	}
ac27a0ec	126
617ba13b	127	ext4_set_inode_flags(inode);
ef7f3835	128	inode->i_ctime = ext4_current_time(inode);
ac27a0ec	129
617ba13b	130	err = ext4_mark_iloc_dirty(handle, inode, &iloc);
ac27a0ec	131	flags_err:
617ba13b	132	ext4_journal_stop(handle);
42a74f20 DH	133	if (err)
42a74f20 DH	134	goto flags_out;
ac27a0ec	135
617ba13b MC	136	if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL))
617ba13b MC	137	err = ext4_change_inode_journal_flag(inode, jflag);
4db46fc2 AK	138	if (err)
	139	goto flags_out;
	140	if (migrate)
	141	err = ext4_ext_migrate(inode);
42a74f20	142	flags_out:
ac27a0ec	143	mutex_unlock(&inode->i_mutex);
2a79f17e	144	mnt_drop_write_file(filp);
ac27a0ec DK	145	return err;
ac27a0ec DK	146	}
617ba13b MC	147	case EXT4_IOC_GETVERSION:
617ba13b MC	148	case EXT4_IOC_GETVERSION_OLD:
ac27a0ec	149	return put_user(inode->i_generation, (int __user *) arg);
617ba13b MC	150	case EXT4_IOC_SETVERSION:
617ba13b MC	151	case EXT4_IOC_SETVERSION_OLD: {
ac27a0ec	152	handle_t *handle;
617ba13b	153	struct ext4_iloc iloc;
ac27a0ec DK	154	__u32 generation;
	155	int err;
	156
2e149670	157	if (!inode_owner_or_capable(inode))
ac27a0ec	158	return -EPERM;
42a74f20	159
814525f4 DW	160	if (EXT4_HAS_RO_COMPAT_FEATURE(inode->i_sb,
	161	EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) {
	162	ext4_warning(sb, "Setting inode version is not "
	163	"supported with metadata_csum enabled.");
	164	return -ENOTTY;
	165	}
	166
a561be71	167	err = mnt_want_write_file(filp);
42a74f20 DH	168	if (err)
	169	return err;
	170	if (get_user(generation, (int __user *) arg)) {
	171	err = -EFAULT;
	172	goto setversion_out;
	173	}
ac27a0ec	174
6c2155b9	175	mutex_lock(&inode->i_mutex);
617ba13b	176	handle = ext4_journal_start(inode, 1);
42a74f20 DH	177	if (IS_ERR(handle)) {
42a74f20 DH	178	err = PTR_ERR(handle);
6c2155b9	179	goto unlock_out;
42a74f20	180	}
617ba13b	181	err = ext4_reserve_inode_write(handle, inode, &iloc);
ac27a0ec	182	if (err == 0) {
ef7f3835	183	inode->i_ctime = ext4_current_time(inode);
ac27a0ec	184	inode->i_generation = generation;
617ba13b	185	err = ext4_mark_iloc_dirty(handle, inode, &iloc);
ac27a0ec	186	}
617ba13b	187	ext4_journal_stop(handle);
6c2155b9 DH	188
	189	unlock_out:
	190	mutex_unlock(&inode->i_mutex);
42a74f20	191	setversion_out:
2a79f17e	192	mnt_drop_write_file(filp);
ac27a0ec DK	193	return err;
ac27a0ec DK	194	}
617ba13b MC	195	case EXT4_IOC_GROUP_EXTEND: {
617ba13b MC	196	ext4_fsblk_t n_blocks_count;
ac046f1d	197	int err, err2=0;
ac27a0ec	198
8f82f840 YY	199	err = ext4_resize_begin(sb);
	200	if (err)
	201	return err;
ac27a0ec	202
014a1770 DH	203	if (get_user(n_blocks_count, (__u32 __user *)arg)) {
	204	err = -EFAULT;
	205	goto group_extend_out;
	206	}
ac27a0ec	207
bab08ab9 TT	208	if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
	209	EXT4_FEATURE_RO_COMPAT_BIGALLOC)) {
	210	ext4_msg(sb, KERN_ERR,
	211	"Online resizing not supported with bigalloc");
014a1770 DH	212	err = -EOPNOTSUPP;
014a1770 DH	213	goto group_extend_out;
bab08ab9 TT	214	}
bab08ab9 TT	215
a561be71	216	err = mnt_want_write_file(filp);
42a74f20	217	if (err)
014a1770	218	goto group_extend_out;
42a74f20	219
617ba13b	220	err = ext4_group_extend(sb, EXT4_SB(sb)->s_es, n_blocks_count);
ac046f1d PT	221	if (EXT4_SB(sb)->s_journal) {
	222	jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
	223	err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
	224	jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
	225	}
7ffe1ea8 HK	226	if (err == 0)
7ffe1ea8 HK	227	err = err2;
2a79f17e	228	mnt_drop_write_file(filp);
014a1770	229	group_extend_out:
8f82f840	230	ext4_resize_end(sb);
ac27a0ec DK	231	return err;
ac27a0ec DK	232	}
748de673 AF	233
	234	case EXT4_IOC_MOVE_EXT: {
	235	struct move_extent me;
2903ff01 AV	236	struct fd donor;
2903ff01 AV	237	int err;
748de673	238
4a58579b AF	239	if (!(filp->f_mode & FMODE_READ) \|\|
	240	!(filp->f_mode & FMODE_WRITE))
	241	return -EBADF;
	242
748de673 AF	243	if (copy_from_user(&me,
	244	(struct move_extent __user *)arg, sizeof(me)))
	245	return -EFAULT;
4a58579b	246	me.moved_len = 0;
748de673	247
2903ff01 AV	248	donor = fdget(me.donor_fd);
2903ff01 AV	249	if (!donor.file)
748de673 AF	250	return -EBADF;
748de673 AF	251
2903ff01	252	if (!(donor.file->f_mode & FMODE_WRITE)) {
4a58579b AF	253	err = -EBADF;
4a58579b AF	254	goto mext_out;
748de673 AF	255	}
748de673 AF	256
bab08ab9 TT	257	if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
	258	EXT4_FEATURE_RO_COMPAT_BIGALLOC)) {
	259	ext4_msg(sb, KERN_ERR,
	260	"Online defrag not supported with bigalloc");
399c9b86 AV	261	err = -EOPNOTSUPP;
399c9b86 AV	262	goto mext_out;
bab08ab9 TT	263	}
bab08ab9 TT	264
a561be71	265	err = mnt_want_write_file(filp);
4a58579b AF	266	if (err)
	267	goto mext_out;
	268
2903ff01	269	err = ext4_move_extents(filp, donor.file, me.orig_start,
748de673	270	me.donor_start, me.len, &me.moved_len);
2a79f17e	271	mnt_drop_write_file(filp);
748de673	272
60e6679e	273	if (copy_to_user((struct move_extent __user *)arg,
c437b273	274	&me, sizeof(me)))
4a58579b AF	275	err = -EFAULT;
4a58579b AF	276	mext_out:
2903ff01	277	fdput(donor);
748de673 AF	278	return err;
	279	}
	280
617ba13b MC	281	case EXT4_IOC_GROUP_ADD: {
617ba13b MC	282	struct ext4_new_group_data input;
ac046f1d	283	int err, err2=0;
ac27a0ec	284
8f82f840 YY	285	err = ext4_resize_begin(sb);
	286	if (err)
	287	return err;
ac27a0ec	288
617ba13b	289	if (copy_from_user(&input, (struct ext4_new_group_input __user *)arg,
014a1770 DH	290	sizeof(input))) {
	291	err = -EFAULT;
	292	goto group_add_out;
	293	}
ac27a0ec	294
bab08ab9 TT	295	if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
	296	EXT4_FEATURE_RO_COMPAT_BIGALLOC)) {
	297	ext4_msg(sb, KERN_ERR,
	298	"Online resizing not supported with bigalloc");
014a1770 DH	299	err = -EOPNOTSUPP;
014a1770 DH	300	goto group_add_out;
bab08ab9 TT	301	}
bab08ab9 TT	302
a561be71	303	err = mnt_want_write_file(filp);
42a74f20	304	if (err)
014a1770	305	goto group_add_out;
42a74f20	306
617ba13b	307	err = ext4_group_add(sb, &input);
ac046f1d PT	308	if (EXT4_SB(sb)->s_journal) {
	309	jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
	310	err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
	311	jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
	312	}
7ffe1ea8 HK	313	if (err == 0)
7ffe1ea8 HK	314	err = err2;
2a79f17e	315	mnt_drop_write_file(filp);
014a1770	316	group_add_out:
8f82f840	317	ext4_resize_end(sb);
ac27a0ec DK	318	return err;
	319	}
	320
c14c6fd5	321	case EXT4_IOC_MIGRATE:
2a43a878 AK	322	{
2a43a878 AK	323	int err;
2e149670	324	if (!inode_owner_or_capable(inode))
2a43a878 AK	325	return -EACCES;
2a43a878 AK	326
a561be71	327	err = mnt_want_write_file(filp);
2a43a878 AK	328	if (err)
	329	return err;
	330	/*
	331	* inode_mutex prevent write and truncate on the file.
	332	* Read still goes through. We take i_data_sem in
	333	* ext4_ext_swap_inode_data before we switch the
	334	* inode format to prevent read.
	335	*/
	336	mutex_lock(&(inode->i_mutex));
	337	err = ext4_ext_migrate(inode);
	338	mutex_unlock(&(inode->i_mutex));
2a79f17e	339	mnt_drop_write_file(filp);
2a43a878 AK	340	return err;
2a43a878 AK	341	}
c14c6fd5	342
ccd2506b TT	343	case EXT4_IOC_ALLOC_DA_BLKS:
	344	{
	345	int err;
2e149670	346	if (!inode_owner_or_capable(inode))
ccd2506b TT	347	return -EACCES;
ccd2506b TT	348
a561be71	349	err = mnt_want_write_file(filp);
ccd2506b TT	350	if (err)
	351	return err;
	352	err = ext4_alloc_da_blocks(inode);
2a79f17e	353	mnt_drop_write_file(filp);
ccd2506b TT	354	return err;
	355	}
	356
19c5246d YY	357	case EXT4_IOC_RESIZE_FS: {
	358	ext4_fsblk_t n_blocks_count;
	359	struct super_block *sb = inode->i_sb;
	360	int err = 0, err2 = 0;
	361
	362	if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
	363	EXT4_FEATURE_RO_COMPAT_BIGALLOC)) {
	364	ext4_msg(sb, KERN_ERR,
	365	"Online resizing not (yet) supported with bigalloc");
	366	return -EOPNOTSUPP;
	367	}
	368
	369	if (EXT4_HAS_INCOMPAT_FEATURE(sb,
	370	EXT4_FEATURE_INCOMPAT_META_BG)) {
	371	ext4_msg(sb, KERN_ERR,
	372	"Online resizing not (yet) supported with meta_bg");
	373	return -EOPNOTSUPP;
	374	}
	375
	376	if (copy_from_user(&n_blocks_count, (__u64 __user *)arg,
	377	sizeof(__u64))) {
	378	return -EFAULT;
	379	}
	380
	381	if (n_blocks_count > MAX_32_NUM &&
	382	!EXT4_HAS_INCOMPAT_FEATURE(sb,
	383	EXT4_FEATURE_INCOMPAT_64BIT)) {
	384	ext4_msg(sb, KERN_ERR,
	385	"File system only supports 32-bit block numbers");
	386	return -EOPNOTSUPP;
	387	}
	388
	389	err = ext4_resize_begin(sb);
	390	if (err)
	391	return err;
	392
8cae6f71	393	err = mnt_want_write_file(filp);
19c5246d YY	394	if (err)
	395	goto resizefs_out;
	396
	397	err = ext4_resize_fs(sb, n_blocks_count);
	398	if (EXT4_SB(sb)->s_journal) {
	399	jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
	400	err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
	401	jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
	402	}
	403	if (err == 0)
	404	err = err2;
8cae6f71	405	mnt_drop_write_file(filp);
19c5246d YY	406	resizefs_out:
	407	ext4_resize_end(sb);
	408	return err;
	409	}
	410
e681c047 LC	411	case FITRIM:
e681c047 LC	412	{
41431792	413	struct request_queue *q = bdev_get_queue(sb->s_bdev);
e681c047 LC	414	struct fstrim_range range;
	415	int ret = 0;
	416
	417	if (!capable(CAP_SYS_ADMIN))
	418	return -EPERM;
	419
41431792 LC	420	if (!blk_queue_discard(q))
	421	return -EOPNOTSUPP;
	422
bab08ab9 TT	423	if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
	424	EXT4_FEATURE_RO_COMPAT_BIGALLOC)) {
	425	ext4_msg(sb, KERN_ERR,
	426	"FITRIM not supported with bigalloc");
	427	return -EOPNOTSUPP;
	428	}
	429
e6705f7c	430	if (copy_from_user(&range, (struct fstrim_range __user *)arg,
e681c047 LC	431	sizeof(range)))
	432	return -EFAULT;
	433
5c2ed62f LC	434	range.minlen = max((unsigned int)range.minlen,
5c2ed62f LC	435	q->limits.discard_granularity);
e681c047 LC	436	ret = ext4_trim_fs(sb, &range);
	437	if (ret < 0)
	438	return ret;
	439
e6705f7c	440	if (copy_to_user((struct fstrim_range __user *)arg, &range,
e681c047 LC	441	sizeof(range)))
	442	return -EFAULT;
	443
	444	return 0;
	445	}
	446
ac27a0ec DK	447	default:
	448	return -ENOTTY;
	449	}
	450	}
	451
	452	#ifdef CONFIG_COMPAT
617ba13b	453	long ext4_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
ac27a0ec	454	{
ac27a0ec DK	455	/* These are just misnamed, they actually get/put from/to user an int */
ac27a0ec DK	456	switch (cmd) {
617ba13b MC	457	case EXT4_IOC32_GETFLAGS:
617ba13b MC	458	cmd = EXT4_IOC_GETFLAGS;
ac27a0ec	459	break;
617ba13b MC	460	case EXT4_IOC32_SETFLAGS:
617ba13b MC	461	cmd = EXT4_IOC_SETFLAGS;
ac27a0ec	462	break;
617ba13b MC	463	case EXT4_IOC32_GETVERSION:
617ba13b MC	464	cmd = EXT4_IOC_GETVERSION;
ac27a0ec	465	break;
617ba13b MC	466	case EXT4_IOC32_SETVERSION:
617ba13b MC	467	cmd = EXT4_IOC_SETVERSION;
ac27a0ec	468	break;
617ba13b MC	469	case EXT4_IOC32_GROUP_EXTEND:
617ba13b MC	470	cmd = EXT4_IOC_GROUP_EXTEND;
ac27a0ec	471	break;
617ba13b MC	472	case EXT4_IOC32_GETVERSION_OLD:
617ba13b MC	473	cmd = EXT4_IOC_GETVERSION_OLD;
ac27a0ec	474	break;
617ba13b MC	475	case EXT4_IOC32_SETVERSION_OLD:
617ba13b MC	476	cmd = EXT4_IOC_SETVERSION_OLD;
ac27a0ec	477	break;
617ba13b MC	478	case EXT4_IOC32_GETRSVSZ:
617ba13b MC	479	cmd = EXT4_IOC_GETRSVSZ;
ac27a0ec	480	break;
617ba13b MC	481	case EXT4_IOC32_SETRSVSZ:
617ba13b MC	482	cmd = EXT4_IOC_SETRSVSZ;
ac27a0ec	483	break;
4d92dc0f BH	484	case EXT4_IOC32_GROUP_ADD: {
	485	struct compat_ext4_new_group_input __user *uinput;
	486	struct ext4_new_group_input input;
	487	mm_segment_t old_fs;
	488	int err;
	489
	490	uinput = compat_ptr(arg);
	491	err = get_user(input.group, &uinput->group);
	492	err \|= get_user(input.block_bitmap, &uinput->block_bitmap);
	493	err \|= get_user(input.inode_bitmap, &uinput->inode_bitmap);
	494	err \|= get_user(input.inode_table, &uinput->inode_table);
	495	err \|= get_user(input.blocks_count, &uinput->blocks_count);
	496	err \|= get_user(input.reserved_blocks,
	497	&uinput->reserved_blocks);
	498	if (err)
	499	return -EFAULT;
	500	old_fs = get_fs();
	501	set_fs(KERNEL_DS);
	502	err = ext4_ioctl(file, EXT4_IOC_GROUP_ADD,
	503	(unsigned long) &input);
	504	set_fs(old_fs);
	505	return err;
	506	}
b684b2ee	507	case EXT4_IOC_MOVE_EXT:
a56e69c2	508	case FITRIM:
19c5246d	509	case EXT4_IOC_RESIZE_FS:
b684b2ee	510	break;
ac27a0ec DK	511	default:
	512	return -ENOIOCTLCMD;
	513	}
5cdd7b2d	514	return ext4_ioctl(file, cmd, (unsigned long) compat_ptr(arg));
ac27a0ec DK	515	}
ac27a0ec DK	516	#endif