ioctl.c 29.0 KB
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// SPDX-License-Identifier: GPL-2.0
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/*
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 * linux/fs/ext4/ioctl.c
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 *
 * 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/capability.h>
#include <linux/time.h>
#include <linux/compat.h>
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#include <linux/mount.h>
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#include <linux/file.h>
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#include <linux/quotaops.h>
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#include <linux/random.h>
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#include <linux/uuid.h>
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#include <linux/uaccess.h>
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#include <linux/delay.h>
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#include <linux/iversion.h>
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#include "ext4_jbd2.h"
#include "ext4.h"
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#include <linux/fsmap.h>
#include "fsmap.h"
#include <trace/events/ext4.h>
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/**
 * Swap memory between @a and @b for @len bytes.
 *
 * @a:          pointer to first memory area
 * @b:          pointer to second memory area
 * @len:        number of bytes to swap
 *
 */
static void memswap(void *a, void *b, size_t len)
{
	unsigned char *ap, *bp;

	ap = (unsigned char *)a;
	bp = (unsigned char *)b;
	while (len-- > 0) {
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		swap(*ap, *bp);
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		ap++;
		bp++;
	}
}

/**
 * Swap i_data and associated attributes between @inode1 and @inode2.
 * This function is used for the primary swap between inode1 and inode2
 * and also to revert this primary swap in case of errors.
 *
 * Therefore you have to make sure, that calling this method twice
 * will revert all changes.
 *
 * @inode1:     pointer to first inode
 * @inode2:     pointer to second inode
 */
static void swap_inode_data(struct inode *inode1, struct inode *inode2)
{
	loff_t isize;
	struct ext4_inode_info *ei1;
	struct ext4_inode_info *ei2;
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	unsigned long tmp;
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	ei1 = EXT4_I(inode1);
	ei2 = EXT4_I(inode2);

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	swap(inode1->i_version, inode2->i_version);
	swap(inode1->i_atime, inode2->i_atime);
	swap(inode1->i_mtime, inode2->i_mtime);
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	memswap(ei1->i_data, ei2->i_data, sizeof(ei1->i_data));
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	tmp = ei1->i_flags & EXT4_FL_SHOULD_SWAP;
	ei1->i_flags = (ei2->i_flags & EXT4_FL_SHOULD_SWAP) |
		(ei1->i_flags & ~EXT4_FL_SHOULD_SWAP);
	ei2->i_flags = tmp | (ei2->i_flags & ~EXT4_FL_SHOULD_SWAP);
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	swap(ei1->i_disksize, ei2->i_disksize);
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	ext4_es_remove_extent(inode1, 0, EXT_MAX_BLOCKS);
	ext4_es_remove_extent(inode2, 0, EXT_MAX_BLOCKS);
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	isize = i_size_read(inode1);
	i_size_write(inode1, i_size_read(inode2));
	i_size_write(inode2, isize);
}

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static void reset_inode_seed(struct inode *inode)
{
	struct ext4_inode_info *ei = EXT4_I(inode);
	struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
	__le32 inum = cpu_to_le32(inode->i_ino);
	__le32 gen = cpu_to_le32(inode->i_generation);
	__u32 csum;

	if (!ext4_has_metadata_csum(inode->i_sb))
		return;

	csum = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&inum, sizeof(inum));
	ei->i_csum_seed = ext4_chksum(sbi, csum, (__u8 *)&gen, sizeof(gen));
}

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/**
 * Swap the information from the given @inode and the inode
 * EXT4_BOOT_LOADER_INO. It will basically swap i_data and all other
 * important fields of the inodes.
 *
 * @sb:         the super block of the filesystem
 * @inode:      the inode to swap with EXT4_BOOT_LOADER_INO
 *
 */
static long swap_inode_boot_loader(struct super_block *sb,
				struct inode *inode)
{
	handle_t *handle;
	int err;
	struct inode *inode_bl;
	struct ext4_inode_info *ei_bl;
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	qsize_t size, size_bl, diff;
	blkcnt_t blocks;
	unsigned short bytes;
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	inode_bl = ext4_iget(sb, EXT4_BOOT_LOADER_INO, EXT4_IGET_SPECIAL);
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	if (IS_ERR(inode_bl))
		return PTR_ERR(inode_bl);
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	ei_bl = EXT4_I(inode_bl);

	/* Protect orig inodes against a truncate and make sure,
	 * that only 1 swap_inode_boot_loader is running. */
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	lock_two_nondirectories(inode, inode_bl);
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	if (inode->i_nlink != 1 || !S_ISREG(inode->i_mode) ||
	    IS_SWAPFILE(inode) || IS_ENCRYPTED(inode) ||
	    ext4_has_inline_data(inode)) {
		err = -EINVAL;
		goto journal_err_out;
	}

	if (IS_RDONLY(inode) || IS_APPEND(inode) || IS_IMMUTABLE(inode) ||
	    !inode_owner_or_capable(inode) || !capable(CAP_SYS_ADMIN)) {
		err = -EPERM;
		goto journal_err_out;
	}

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	down_write(&EXT4_I(inode)->i_mmap_sem);
	err = filemap_write_and_wait(inode->i_mapping);
	if (err)
		goto err_out;

	err = filemap_write_and_wait(inode_bl->i_mapping);
	if (err)
		goto err_out;

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	/* Wait for all existing dio workers */
	inode_dio_wait(inode);
	inode_dio_wait(inode_bl);

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	truncate_inode_pages(&inode->i_data, 0);
	truncate_inode_pages(&inode_bl->i_data, 0);

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	handle = ext4_journal_start(inode_bl, EXT4_HT_MOVE_EXTENTS, 2);
	if (IS_ERR(handle)) {
		err = -EINVAL;
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		goto err_out;
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	}

	/* Protect extent tree against block allocations via delalloc */
	ext4_double_down_write_data_sem(inode, inode_bl);

	if (inode_bl->i_nlink == 0) {
		/* this inode has never been used as a BOOT_LOADER */
		set_nlink(inode_bl, 1);
		i_uid_write(inode_bl, 0);
		i_gid_write(inode_bl, 0);
		inode_bl->i_flags = 0;
		ei_bl->i_flags = 0;
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		inode_set_iversion(inode_bl, 1);
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		i_size_write(inode_bl, 0);
		inode_bl->i_mode = S_IFREG;
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		if (ext4_has_feature_extents(sb)) {
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			ext4_set_inode_flag(inode_bl, EXT4_INODE_EXTENTS);
			ext4_ext_tree_init(handle, inode_bl);
		} else
			memset(ei_bl->i_data, 0, sizeof(ei_bl->i_data));
	}

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	err = dquot_initialize(inode);
	if (err)
		goto err_out1;

	size = (qsize_t)(inode->i_blocks) * (1 << 9) + inode->i_bytes;
	size_bl = (qsize_t)(inode_bl->i_blocks) * (1 << 9) + inode_bl->i_bytes;
	diff = size - size_bl;
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	swap_inode_data(inode, inode_bl);

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	inode->i_ctime = inode_bl->i_ctime = current_time(inode);
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	inode->i_generation = prandom_u32();
	inode_bl->i_generation = prandom_u32();
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	reset_inode_seed(inode);
	reset_inode_seed(inode_bl);
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	ext4_discard_preallocations(inode);

	err = ext4_mark_inode_dirty(handle, inode);
	if (err < 0) {
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		/* No need to update quota information. */
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		ext4_warning(inode->i_sb,
			"couldn't mark inode #%lu dirty (err %d)",
			inode->i_ino, err);
		/* Revert all changes: */
		swap_inode_data(inode, inode_bl);
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		ext4_mark_inode_dirty(handle, inode);
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		goto err_out1;
	}

	blocks = inode_bl->i_blocks;
	bytes = inode_bl->i_bytes;
	inode_bl->i_blocks = inode->i_blocks;
	inode_bl->i_bytes = inode->i_bytes;
	err = ext4_mark_inode_dirty(handle, inode_bl);
	if (err < 0) {
		/* No need to update quota information. */
		ext4_warning(inode_bl->i_sb,
			"couldn't mark inode #%lu dirty (err %d)",
			inode_bl->i_ino, err);
		goto revert;
	}

	/* Bootloader inode should not be counted into quota information. */
	if (diff > 0)
		dquot_free_space(inode, diff);
	else
		err = dquot_alloc_space(inode, -1 * diff);

	if (err < 0) {
revert:
		/* Revert all changes: */
		inode_bl->i_blocks = blocks;
		inode_bl->i_bytes = bytes;
		swap_inode_data(inode, inode_bl);
		ext4_mark_inode_dirty(handle, inode);
		ext4_mark_inode_dirty(handle, inode_bl);
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	}
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err_out1:
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	ext4_journal_stop(handle);
	ext4_double_up_write_data_sem(inode, inode_bl);

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err_out:
	up_write(&EXT4_I(inode)->i_mmap_sem);
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journal_err_out:
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	unlock_two_nondirectories(inode, inode_bl);
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	iput(inode_bl);
	return err;
}

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#ifdef CONFIG_EXT4_FS_ENCRYPTION
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static int uuid_is_zero(__u8 u[16])
{
	int	i;

	for (i = 0; i < 16; i++)
		if (u[i])
			return 0;
	return 1;
}
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#endif
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static int ext4_ioctl_setflags(struct inode *inode,
			       unsigned int flags)
{
	struct ext4_inode_info *ei = EXT4_I(inode);
	handle_t *handle = NULL;
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	int err = -EPERM, migrate = 0;
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	struct ext4_iloc iloc;
	unsigned int oldflags, mask, i;
	unsigned int jflag;

	/* Is it quota file? Do not allow user to mess with it */
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	if (ext4_is_quota_file(inode))
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		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 ((flags ^ oldflags) & EXT4_EXTENTS_FL)
		migrate = 1;

	if (flags & EXT4_EOFBLOCKS_FL) {
		/* we don't support adding EOFBLOCKS flag */
		if (!(oldflags & EXT4_EOFBLOCKS_FL)) {
			err = -EOPNOTSUPP;
			goto flags_out;
		}
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	} else if (oldflags & EXT4_EOFBLOCKS_FL) {
		err = ext4_truncate(inode);
		if (err)
			goto flags_out;
	}
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	handle = ext4_journal_start(inode, EXT4_HT_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;
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		/* These flags get special treatment later */
		if (mask == EXT4_JOURNAL_DATA_FL || mask == EXT4_EXTENTS_FL)
			continue;
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		if (mask & flags)
			ext4_set_inode_flag(inode, i);
		else
			ext4_clear_inode_flag(inode, i);
	}

	ext4_set_inode_flags(inode);
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	inode->i_ctime = current_time(inode);
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	err = ext4_mark_iloc_dirty(handle, inode, &iloc);
flags_err:
	ext4_journal_stop(handle);
	if (err)
		goto flags_out;

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	if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL)) {
		/*
		 * Changes to the journaling mode can cause unsafe changes to
		 * S_DAX if we are using the DAX mount option.
		 */
		if (test_opt(inode->i_sb, DAX)) {
			err = -EBUSY;
			goto flags_out;
		}

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		err = ext4_change_inode_journal_flag(inode, jflag);
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		if (err)
			goto flags_out;
	}
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	if (migrate) {
		if (flags & EXT4_EXTENTS_FL)
			err = ext4_ext_migrate(inode);
		else
			err = ext4_ind_migrate(inode);
	}

flags_out:
	return err;
}

#ifdef CONFIG_QUOTA
static int ext4_ioctl_setproject(struct file *filp, __u32 projid)
{
	struct inode *inode = file_inode(filp);
	struct super_block *sb = inode->i_sb;
	struct ext4_inode_info *ei = EXT4_I(inode);
	int err, rc;
	handle_t *handle;
	kprojid_t kprojid;
	struct ext4_iloc iloc;
	struct ext4_inode *raw_inode;
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	struct dquot *transfer_to[MAXQUOTAS] = { };
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	if (!ext4_has_feature_project(sb)) {
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		if (projid != EXT4_DEF_PROJID)
			return -EOPNOTSUPP;
		else
			return 0;
	}

	if (EXT4_INODE_SIZE(sb) <= EXT4_GOOD_OLD_INODE_SIZE)
		return -EOPNOTSUPP;

	kprojid = make_kprojid(&init_user_ns, (projid_t)projid);

	if (projid_eq(kprojid, EXT4_I(inode)->i_projid))
		return 0;

	err = -EPERM;
	/* Is it quota file? Do not allow user to mess with it */
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	if (ext4_is_quota_file(inode))
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		return err;
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	err = ext4_get_inode_loc(inode, &iloc);
	if (err)
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		return err;
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	raw_inode = ext4_raw_inode(&iloc);
	if (!EXT4_FITS_IN_INODE(raw_inode, ei, i_projid)) {
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		err = ext4_expand_extra_isize(inode,
					      EXT4_SB(sb)->s_want_extra_isize,
					      &iloc);
		if (err)
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			return err;
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	} else {
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		brelse(iloc.bh);
	}

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	err = dquot_initialize(inode);
	if (err)
		return err;
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	handle = ext4_journal_start(inode, EXT4_HT_QUOTA,
		EXT4_QUOTA_INIT_BLOCKS(sb) +
		EXT4_QUOTA_DEL_BLOCKS(sb) + 3);
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	if (IS_ERR(handle))
		return PTR_ERR(handle);
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	err = ext4_reserve_inode_write(handle, inode, &iloc);
	if (err)
		goto out_stop;

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	transfer_to[PRJQUOTA] = dqget(sb, make_kqid_projid(kprojid));
	if (!IS_ERR(transfer_to[PRJQUOTA])) {
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		/* __dquot_transfer() calls back ext4_get_inode_usage() which
		 * counts xattr inode references.
		 */
		down_read(&EXT4_I(inode)->xattr_sem);
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		err = __dquot_transfer(inode, transfer_to);
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		up_read(&EXT4_I(inode)->xattr_sem);
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		dqput(transfer_to[PRJQUOTA]);
		if (err)
			goto out_dirty;
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	}
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	EXT4_I(inode)->i_projid = kprojid;
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	inode->i_ctime = current_time(inode);
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out_dirty:
	rc = ext4_mark_iloc_dirty(handle, inode, &iloc);
	if (!err)
		err = rc;
out_stop:
	ext4_journal_stop(handle);
	return err;
}
#else
static int ext4_ioctl_setproject(struct file *filp, __u32 projid)
{
	if (projid != EXT4_DEF_PROJID)
		return -EOPNOTSUPP;
	return 0;
}
#endif

/* Transfer internal flags to xflags */
static inline __u32 ext4_iflags_to_xflags(unsigned long iflags)
{
	__u32 xflags = 0;

	if (iflags & EXT4_SYNC_FL)
		xflags |= FS_XFLAG_SYNC;
	if (iflags & EXT4_IMMUTABLE_FL)
		xflags |= FS_XFLAG_IMMUTABLE;
	if (iflags & EXT4_APPEND_FL)
		xflags |= FS_XFLAG_APPEND;
	if (iflags & EXT4_NODUMP_FL)
		xflags |= FS_XFLAG_NODUMP;
	if (iflags & EXT4_NOATIME_FL)
		xflags |= FS_XFLAG_NOATIME;
	if (iflags & EXT4_PROJINHERIT_FL)
		xflags |= FS_XFLAG_PROJINHERIT;
	return xflags;
}

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#define EXT4_SUPPORTED_FS_XFLAGS (FS_XFLAG_SYNC | FS_XFLAG_IMMUTABLE | \
				  FS_XFLAG_APPEND | FS_XFLAG_NODUMP | \
				  FS_XFLAG_NOATIME | FS_XFLAG_PROJINHERIT)

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/* Transfer xflags flags to internal */
static inline unsigned long ext4_xflags_to_iflags(__u32 xflags)
{
	unsigned long iflags = 0;

	if (xflags & FS_XFLAG_SYNC)
		iflags |= EXT4_SYNC_FL;
	if (xflags & FS_XFLAG_IMMUTABLE)
		iflags |= EXT4_IMMUTABLE_FL;
	if (xflags & FS_XFLAG_APPEND)
		iflags |= EXT4_APPEND_FL;
	if (xflags & FS_XFLAG_NODUMP)
		iflags |= EXT4_NODUMP_FL;
	if (xflags & FS_XFLAG_NOATIME)
		iflags |= EXT4_NOATIME_FL;
	if (xflags & FS_XFLAG_PROJINHERIT)
		iflags |= EXT4_PROJINHERIT_FL;

	return iflags;
}

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Eric Biggers 已提交
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static int ext4_shutdown(struct super_block *sb, unsigned long arg)
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{
	struct ext4_sb_info *sbi = EXT4_SB(sb);
	__u32 flags;

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

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

	if (flags > EXT4_GOING_FLAGS_NOLOGFLUSH)
		return -EINVAL;

	if (ext4_forced_shutdown(sbi))
		return 0;

	ext4_msg(sb, KERN_ALERT, "shut down requested (%d)", flags);
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	trace_ext4_shutdown(sb, flags);
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	switch (flags) {
	case EXT4_GOING_FLAGS_DEFAULT:
		freeze_bdev(sb->s_bdev);
		set_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
		thaw_bdev(sb->s_bdev, sb);
		break;
	case EXT4_GOING_FLAGS_LOGFLUSH:
		set_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
		if (sbi->s_journal && !is_journal_aborted(sbi->s_journal)) {
			(void) ext4_force_commit(sb);
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			jbd2_journal_abort(sbi->s_journal, -ESHUTDOWN);
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		}
		break;
	case EXT4_GOING_FLAGS_NOLOGFLUSH:
		set_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
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		if (sbi->s_journal && !is_journal_aborted(sbi->s_journal))
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			jbd2_journal_abort(sbi->s_journal, -ESHUTDOWN);
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		break;
	default:
		return -EINVAL;
	}
	clear_opt(sb, DISCARD);
	return 0;
}

D
Darrick J. Wong 已提交
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struct getfsmap_info {
	struct super_block	*gi_sb;
	struct fsmap_head __user *gi_data;
	unsigned int		gi_idx;
	__u32			gi_last_flags;
};

static int ext4_getfsmap_format(struct ext4_fsmap *xfm, void *priv)
{
	struct getfsmap_info *info = priv;
	struct fsmap fm;

	trace_ext4_getfsmap_mapping(info->gi_sb, xfm);

	info->gi_last_flags = xfm->fmr_flags;
	ext4_fsmap_from_internal(info->gi_sb, &fm, xfm);
	if (copy_to_user(&info->gi_data->fmh_recs[info->gi_idx++], &fm,
			sizeof(struct fsmap)))
		return -EFAULT;

	return 0;
}

static int ext4_ioc_getfsmap(struct super_block *sb,
			     struct fsmap_head __user *arg)
{
	struct getfsmap_info info = {0};
	struct ext4_fsmap_head xhead = {0};
	struct fsmap_head head;
	bool aborted = false;
	int error;

	if (copy_from_user(&head, arg, sizeof(struct fsmap_head)))
		return -EFAULT;
	if (memchr_inv(head.fmh_reserved, 0, sizeof(head.fmh_reserved)) ||
	    memchr_inv(head.fmh_keys[0].fmr_reserved, 0,
		       sizeof(head.fmh_keys[0].fmr_reserved)) ||
	    memchr_inv(head.fmh_keys[1].fmr_reserved, 0,
		       sizeof(head.fmh_keys[1].fmr_reserved)))
		return -EINVAL;
	/*
	 * ext4 doesn't report file extents at all, so the only valid
	 * file offsets are the magic ones (all zeroes or all ones).
	 */
	if (head.fmh_keys[0].fmr_offset ||
	    (head.fmh_keys[1].fmr_offset != 0 &&
	     head.fmh_keys[1].fmr_offset != -1ULL))
		return -EINVAL;

	xhead.fmh_iflags = head.fmh_iflags;
	xhead.fmh_count = head.fmh_count;
	ext4_fsmap_to_internal(sb, &xhead.fmh_keys[0], &head.fmh_keys[0]);
	ext4_fsmap_to_internal(sb, &xhead.fmh_keys[1], &head.fmh_keys[1]);

	trace_ext4_getfsmap_low_key(sb, &xhead.fmh_keys[0]);
	trace_ext4_getfsmap_high_key(sb, &xhead.fmh_keys[1]);

	info.gi_sb = sb;
	info.gi_data = arg;
	error = ext4_getfsmap(sb, &xhead, ext4_getfsmap_format, &info);
	if (error == EXT4_QUERY_RANGE_ABORT) {
		error = 0;
		aborted = true;
	} else if (error)
		return error;

	/* If we didn't abort, set the "last" flag in the last fmx */
	if (!aborted && info.gi_idx) {
		info.gi_last_flags |= FMR_OF_LAST;
		if (copy_to_user(&info.gi_data->fmh_recs[info.gi_idx - 1].fmr_flags,
				 &info.gi_last_flags,
				 sizeof(info.gi_last_flags)))
			return -EFAULT;
	}

	/* copy back header */
	head.fmh_entries = xhead.fmh_entries;
	head.fmh_oflags = xhead.fmh_oflags;
	if (copy_to_user(arg, &head, sizeof(struct fsmap_head)))
		return -EFAULT;

	return 0;
}

650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687
static long ext4_ioctl_group_add(struct file *file,
				 struct ext4_new_group_data *input)
{
	struct super_block *sb = file_inode(file)->i_sb;
	int err, err2=0;

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

	if (ext4_has_feature_bigalloc(sb)) {
		ext4_msg(sb, KERN_ERR,
			 "Online resizing not supported with bigalloc");
		err = -EOPNOTSUPP;
		goto group_add_out;
	}

	err = mnt_want_write_file(file);
	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(file);
	if (!err && ext4_has_group_desc_csum(sb) &&
	    test_opt(sb, INIT_INODE_TABLE))
		err = ext4_register_li_request(sb, input->group);
group_add_out:
	ext4_resize_end(sb);
	return err;
}

688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711
static int ext4_ioctl_check_project(struct inode *inode, struct fsxattr *fa)
{
	/*
	 * Project Quota ID state is only allowed to change from within the init
	 * namespace. Enforce that restriction only if we are trying to change
	 * the quota ID state. Everything else is allowed in user namespaces.
	 */
	if (current_user_ns() == &init_user_ns)
		return 0;

	if (__kprojid_val(EXT4_I(inode)->i_projid) != fa->fsx_projid)
		return -EINVAL;

	if (ext4_test_inode_flag(inode, EXT4_INODE_PROJINHERIT)) {
		if (!(fa->fsx_xflags & FS_XFLAG_PROJINHERIT))
			return -EINVAL;
	} else {
		if (fa->fsx_xflags & FS_XFLAG_PROJINHERIT)
			return -EINVAL;
	}

	return 0;
}

A
Andi Kleen 已提交
712
long ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
713
{
A
Al Viro 已提交
714
	struct inode *inode = file_inode(filp);
715
	struct super_block *sb = inode->i_sb;
716
	struct ext4_inode_info *ei = EXT4_I(inode);
717 718
	unsigned int flags;

719
	ext4_debug("cmd = %u, arg = %lu\n", cmd, arg);
720 721

	switch (cmd) {
D
Darrick J. Wong 已提交
722 723
	case FS_IOC_GETFSMAP:
		return ext4_ioc_getfsmap(sb, (void __user *)arg);
724 725
	case EXT4_IOC_GETFLAGS:
		flags = ei->i_flags & EXT4_FL_USER_VISIBLE;
726
		return put_user(flags, (int __user *) arg);
727
	case EXT4_IOC_SETFLAGS: {
728
		int err;
729

730
		if (!inode_owner_or_capable(inode))
731 732 733 734 735
			return -EACCES;

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

736 737 738 739 740 741 742 743 744 745 746 747
		if (flags & ~EXT4_FL_USER_VISIBLE)
			return -EOPNOTSUPP;
		/*
		 * chattr(1) grabs flags via GETFLAGS, modifies the result and
		 * passes that to SETFLAGS. So we cannot easily make SETFLAGS
		 * more restrictive than just silently masking off visible but
		 * not settable flags as we always did.
		 */
		flags &= EXT4_FL_USER_MODIFIABLE;
		if (ext4_mask_flags(inode->i_mode, flags) != flags)
			return -EOPNOTSUPP;

748
		err = mnt_want_write_file(filp);
749 750 751
		if (err)
			return err;

A
Al Viro 已提交
752
		inode_lock(inode);
753
		err = ext4_ioctl_setflags(inode, flags);
A
Al Viro 已提交
754
		inode_unlock(inode);
A
Al Viro 已提交
755
		mnt_drop_write_file(filp);
756 757
		return err;
	}
758 759
	case EXT4_IOC_GETVERSION:
	case EXT4_IOC_GETVERSION_OLD:
760
		return put_user(inode->i_generation, (int __user *) arg);
761 762
	case EXT4_IOC_SETVERSION:
	case EXT4_IOC_SETVERSION_OLD: {
763
		handle_t *handle;
764
		struct ext4_iloc iloc;
765 766 767
		__u32 generation;
		int err;

768
		if (!inode_owner_or_capable(inode))
769
			return -EPERM;
770

771
		if (ext4_has_metadata_csum(inode->i_sb)) {
772 773 774 775 776
			ext4_warning(sb, "Setting inode version is not "
				     "supported with metadata_csum enabled.");
			return -ENOTTY;
		}

777
		err = mnt_want_write_file(filp);
778 779 780 781 782 783
		if (err)
			return err;
		if (get_user(generation, (int __user *) arg)) {
			err = -EFAULT;
			goto setversion_out;
		}
784

A
Al Viro 已提交
785
		inode_lock(inode);
786
		handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
787 788
		if (IS_ERR(handle)) {
			err = PTR_ERR(handle);
789
			goto unlock_out;
790
		}
791
		err = ext4_reserve_inode_write(handle, inode, &iloc);
792
		if (err == 0) {
793
			inode->i_ctime = current_time(inode);
794
			inode->i_generation = generation;
795
			err = ext4_mark_iloc_dirty(handle, inode, &iloc);
796
		}
797
		ext4_journal_stop(handle);
798 799

unlock_out:
A
Al Viro 已提交
800
		inode_unlock(inode);
801
setversion_out:
A
Al Viro 已提交
802
		mnt_drop_write_file(filp);
803 804
		return err;
	}
805 806
	case EXT4_IOC_GROUP_EXTEND: {
		ext4_fsblk_t n_blocks_count;
807
		int err, err2=0;
808

809 810 811
		err = ext4_resize_begin(sb);
		if (err)
			return err;
812

813 814 815 816
		if (get_user(n_blocks_count, (__u32 __user *)arg)) {
			err = -EFAULT;
			goto group_extend_out;
		}
817

818
		if (ext4_has_feature_bigalloc(sb)) {
819 820
			ext4_msg(sb, KERN_ERR,
				 "Online resizing not supported with bigalloc");
821 822
			err = -EOPNOTSUPP;
			goto group_extend_out;
823 824
		}

825
		err = mnt_want_write_file(filp);
826
		if (err)
827
			goto group_extend_out;
828

829
		err = ext4_group_extend(sb, EXT4_SB(sb)->s_es, n_blocks_count);
830 831 832 833 834
		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);
		}
835 836
		if (err == 0)
			err = err2;
A
Al Viro 已提交
837
		mnt_drop_write_file(filp);
838
group_extend_out:
839
		ext4_resize_end(sb);
840 841
		return err;
	}
842 843 844

	case EXT4_IOC_MOVE_EXT: {
		struct move_extent me;
845 846
		struct fd donor;
		int err;
847

848 849 850 851
		if (!(filp->f_mode & FMODE_READ) ||
		    !(filp->f_mode & FMODE_WRITE))
			return -EBADF;

852 853 854
		if (copy_from_user(&me,
			(struct move_extent __user *)arg, sizeof(me)))
			return -EFAULT;
855
		me.moved_len = 0;
856

857 858
		donor = fdget(me.donor_fd);
		if (!donor.file)
859 860
			return -EBADF;

861
		if (!(donor.file->f_mode & FMODE_WRITE)) {
862 863
			err = -EBADF;
			goto mext_out;
864 865
		}

866
		if (ext4_has_feature_bigalloc(sb)) {
867 868
			ext4_msg(sb, KERN_ERR,
				 "Online defrag not supported with bigalloc");
869 870
			err = -EOPNOTSUPP;
			goto mext_out;
871 872 873 874 875
		} else if (IS_DAX(inode)) {
			ext4_msg(sb, KERN_ERR,
				 "Online defrag not supported with DAX");
			err = -EOPNOTSUPP;
			goto mext_out;
876 877
		}

878
		err = mnt_want_write_file(filp);
879 880 881
		if (err)
			goto mext_out;

882
		err = ext4_move_extents(filp, donor.file, me.orig_start,
883
					me.donor_start, me.len, &me.moved_len);
A
Al Viro 已提交
884
		mnt_drop_write_file(filp);
885

886
		if (copy_to_user((struct move_extent __user *)arg,
887
				 &me, sizeof(me)))
888 889
			err = -EFAULT;
mext_out:
890
		fdput(donor);
891 892 893
		return err;
	}

894 895
	case EXT4_IOC_GROUP_ADD: {
		struct ext4_new_group_data input;
896

897
		if (copy_from_user(&input, (struct ext4_new_group_input __user *)arg,
898 899
				sizeof(input)))
			return -EFAULT;
900

901
		return ext4_ioctl_group_add(filp, &input);
902 903
	}

904
	case EXT4_IOC_MIGRATE:
905 906
	{
		int err;
907
		if (!inode_owner_or_capable(inode))
908 909
			return -EACCES;

910
		err = mnt_want_write_file(filp);
911 912 913 914 915 916 917 918
		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.
		 */
A
Al Viro 已提交
919
		inode_lock((inode));
920
		err = ext4_ext_migrate(inode);
A
Al Viro 已提交
921
		inode_unlock((inode));
A
Al Viro 已提交
922
		mnt_drop_write_file(filp);
923 924
		return err;
	}
925

926 927 928
	case EXT4_IOC_ALLOC_DA_BLKS:
	{
		int err;
929
		if (!inode_owner_or_capable(inode))
930 931
			return -EACCES;

932
		err = mnt_want_write_file(filp);
933 934 935
		if (err)
			return err;
		err = ext4_alloc_da_blocks(inode);
A
Al Viro 已提交
936
		mnt_drop_write_file(filp);
937 938 939
		return err;
	}

940
	case EXT4_IOC_SWAP_BOOT:
941 942
	{
		int err;
943 944
		if (!(filp->f_mode & FMODE_WRITE))
			return -EBADF;
945 946 947 948 949 950 951
		err = mnt_want_write_file(filp);
		if (err)
			return err;
		err = swap_inode_boot_loader(sb, inode);
		mnt_drop_write_file(filp);
		return err;
	}
952

953 954 955
	case EXT4_IOC_RESIZE_FS: {
		ext4_fsblk_t n_blocks_count;
		int err = 0, err2 = 0;
956
		ext4_group_t o_group = EXT4_SB(sb)->s_groups_count;
957 958 959 960 961 962 963 964 965 966

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

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

967
		err = mnt_want_write_file(filp);
968 969 970 971 972 973 974 975 976 977 978
		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;
979
		mnt_drop_write_file(filp);
980 981 982 983 984
		if (!err && (o_group > EXT4_SB(sb)->s_groups_count) &&
		    ext4_has_group_desc_csum(sb) &&
		    test_opt(sb, INIT_INODE_TABLE))
			err = ext4_register_li_request(sb, o_group);

985 986 987 988 989
resizefs_out:
		ext4_resize_end(sb);
		return err;
	}

990 991
	case FITRIM:
	{
992
		struct request_queue *q = bdev_get_queue(sb->s_bdev);
993 994 995 996 997 998
		struct fstrim_range range;
		int ret = 0;

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

999 1000 1001
		if (!blk_queue_discard(q))
			return -EOPNOTSUPP;

1002
		if (copy_from_user(&range, (struct fstrim_range __user *)arg,
1003 1004 1005
		    sizeof(range)))
			return -EFAULT;

1006 1007
		range.minlen = max((unsigned int)range.minlen,
				   q->limits.discard_granularity);
1008 1009 1010 1011
		ret = ext4_trim_fs(sb, &range);
		if (ret < 0)
			return ret;

1012
		if (copy_to_user((struct fstrim_range __user *)arg, &range,
1013 1014 1015 1016 1017
		    sizeof(range)))
			return -EFAULT;

		return 0;
	}
1018 1019
	case EXT4_IOC_PRECACHE_EXTENTS:
		return ext4_ext_precache(inode);
1020

1021
	case EXT4_IOC_SET_ENCRYPTION_POLICY:
1022 1023
		if (!ext4_has_feature_encrypt(sb))
			return -EOPNOTSUPP;
1024
		return fscrypt_ioctl_set_policy(filp, (const void __user *)arg);
1025

1026
	case EXT4_IOC_GET_ENCRYPTION_PWSALT: {
1027
#ifdef CONFIG_EXT4_FS_ENCRYPTION
1028 1029 1030 1031
		int err, err2;
		struct ext4_sb_info *sbi = EXT4_SB(sb);
		handle_t *handle;

1032
		if (!ext4_has_feature_encrypt(sb))
1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057
			return -EOPNOTSUPP;
		if (uuid_is_zero(sbi->s_es->s_encrypt_pw_salt)) {
			err = mnt_want_write_file(filp);
			if (err)
				return err;
			handle = ext4_journal_start_sb(sb, EXT4_HT_MISC, 1);
			if (IS_ERR(handle)) {
				err = PTR_ERR(handle);
				goto pwsalt_err_exit;
			}
			err = ext4_journal_get_write_access(handle, sbi->s_sbh);
			if (err)
				goto pwsalt_err_journal;
			generate_random_uuid(sbi->s_es->s_encrypt_pw_salt);
			err = ext4_handle_dirty_metadata(handle, NULL,
							 sbi->s_sbh);
		pwsalt_err_journal:
			err2 = ext4_journal_stop(handle);
			if (err2 && !err)
				err = err2;
		pwsalt_err_exit:
			mnt_drop_write_file(filp);
			if (err)
				return err;
		}
1058 1059
		if (copy_to_user((void __user *) arg,
				 sbi->s_es->s_encrypt_pw_salt, 16))
1060 1061
			return -EFAULT;
		return 0;
1062 1063 1064
#else
		return -EOPNOTSUPP;
#endif
1065
	}
1066 1067
	case EXT4_IOC_GET_ENCRYPTION_POLICY:
		return fscrypt_ioctl_get_policy(filp, (void __user *)arg);
1068

1069 1070 1071 1072 1073 1074 1075
	case EXT4_IOC_FSGETXATTR:
	{
		struct fsxattr fa;

		memset(&fa, 0, sizeof(struct fsxattr));
		fa.fsx_xflags = ext4_iflags_to_xflags(ei->i_flags & EXT4_FL_USER_VISIBLE);

K
Kaho Ng 已提交
1076
		if (ext4_has_feature_project(inode->i_sb)) {
1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098
			fa.fsx_projid = (__u32)from_kprojid(&init_user_ns,
				EXT4_I(inode)->i_projid);
		}

		if (copy_to_user((struct fsxattr __user *)arg,
				 &fa, sizeof(fa)))
			return -EFAULT;
		return 0;
	}
	case EXT4_IOC_FSSETXATTR:
	{
		struct fsxattr fa;
		int err;

		if (copy_from_user(&fa, (struct fsxattr __user *)arg,
				   sizeof(fa)))
			return -EFAULT;

		/* Make sure caller has proper permission */
		if (!inode_owner_or_capable(inode))
			return -EACCES;

1099 1100 1101 1102 1103 1104 1105
		if (fa.fsx_xflags & ~EXT4_SUPPORTED_FS_XFLAGS)
			return -EOPNOTSUPP;

		flags = ext4_xflags_to_iflags(fa.fsx_xflags);
		if (ext4_mask_flags(inode->i_mode, flags) != flags)
			return -EOPNOTSUPP;

1106 1107 1108 1109
		err = mnt_want_write_file(filp);
		if (err)
			return err;

A
Al Viro 已提交
1110
		inode_lock(inode);
1111 1112 1113
		err = ext4_ioctl_check_project(inode, &fa);
		if (err)
			goto out;
1114 1115 1116 1117
		flags = (ei->i_flags & ~EXT4_FL_XFLAG_VISIBLE) |
			 (flags & EXT4_FL_XFLAG_VISIBLE);
		err = ext4_ioctl_setflags(inode, flags);
		if (err)
1118
			goto out;
1119
		err = ext4_ioctl_setproject(filp, fa.fsx_projid);
1120 1121 1122 1123
out:
		inode_unlock(inode);
		mnt_drop_write_file(filp);
		return err;
1124
	}
1125 1126
	case EXT4_IOC_SHUTDOWN:
		return ext4_shutdown(sb, arg);
1127 1128 1129 1130 1131 1132
	default:
		return -ENOTTY;
	}
}

#ifdef CONFIG_COMPAT
1133
long ext4_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1134 1135 1136
{
	/* These are just misnamed, they actually get/put from/to user an int */
	switch (cmd) {
1137 1138
	case EXT4_IOC32_GETFLAGS:
		cmd = EXT4_IOC_GETFLAGS;
1139
		break;
1140 1141
	case EXT4_IOC32_SETFLAGS:
		cmd = EXT4_IOC_SETFLAGS;
1142
		break;
1143 1144
	case EXT4_IOC32_GETVERSION:
		cmd = EXT4_IOC_GETVERSION;
1145
		break;
1146 1147
	case EXT4_IOC32_SETVERSION:
		cmd = EXT4_IOC_SETVERSION;
1148
		break;
1149 1150
	case EXT4_IOC32_GROUP_EXTEND:
		cmd = EXT4_IOC_GROUP_EXTEND;
1151
		break;
1152 1153
	case EXT4_IOC32_GETVERSION_OLD:
		cmd = EXT4_IOC_GETVERSION_OLD;
1154
		break;
1155 1156
	case EXT4_IOC32_SETVERSION_OLD:
		cmd = EXT4_IOC_SETVERSION_OLD;
1157
		break;
1158 1159
	case EXT4_IOC32_GETRSVSZ:
		cmd = EXT4_IOC_GETRSVSZ;
1160
		break;
1161 1162
	case EXT4_IOC32_SETRSVSZ:
		cmd = EXT4_IOC_SETRSVSZ;
1163
		break;
1164 1165
	case EXT4_IOC32_GROUP_ADD: {
		struct compat_ext4_new_group_input __user *uinput;
1166
		struct ext4_new_group_data input;
1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178
		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;
1179
		return ext4_ioctl_group_add(file, &input);
1180
	}
1181
	case EXT4_IOC_MOVE_EXT:
1182
	case EXT4_IOC_RESIZE_FS:
1183
	case EXT4_IOC_PRECACHE_EXTENTS:
1184 1185 1186
	case EXT4_IOC_SET_ENCRYPTION_POLICY:
	case EXT4_IOC_GET_ENCRYPTION_PWSALT:
	case EXT4_IOC_GET_ENCRYPTION_POLICY:
1187
	case EXT4_IOC_SHUTDOWN:
D
Darrick J. Wong 已提交
1188
	case FS_IOC_GETFSMAP:
1189
		break;
1190 1191 1192
	default:
		return -ENOIOCTLCMD;
	}
A
Andi Kleen 已提交
1193
	return ext4_ioctl(file, cmd, (unsigned long) compat_ptr(arg));
1194 1195
}
#endif