C++ (Cpp) EXT4_QUOTA_DEL_BLOCKS Examples

Example #1

File: ioctl.c Project: ReneNyffenegger/linux

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;
	struct dquot *transfer_to[MAXQUOTAS] = { };

	if (!ext4_has_feature_project(sb)) {
		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 = mnt_want_write_file(filp);
	if (err)
		return err;

	err = -EPERM;
	inode_lock(inode);
	/* Is it quota file? Do not allow user to mess with it */
	if (ext4_is_quota_file(inode))
		goto out_unlock;

	err = ext4_get_inode_loc(inode, &iloc);
	if (err)
		goto out_unlock;

	raw_inode = ext4_raw_inode(&iloc);
	if (!EXT4_FITS_IN_INODE(raw_inode, ei, i_projid)) {
		err = ext4_expand_extra_isize(inode,
					      EXT4_SB(sb)->s_want_extra_isize,
					      &iloc);
		if (err)
			goto out_unlock;
	} else {
		brelse(iloc.bh);
	}

	dquot_initialize(inode);

	handle = ext4_journal_start(inode, EXT4_HT_QUOTA,
		EXT4_QUOTA_INIT_BLOCKS(sb) +
		EXT4_QUOTA_DEL_BLOCKS(sb) + 3);
	if (IS_ERR(handle)) {
		err = PTR_ERR(handle);
		goto out_unlock;
	}

	err = ext4_reserve_inode_write(handle, inode, &iloc);
	if (err)
		goto out_stop;

	transfer_to[PRJQUOTA] = dqget(sb, make_kqid_projid(kprojid));
	if (!IS_ERR(transfer_to[PRJQUOTA])) {

		/* __dquot_transfer() calls back ext4_get_inode_usage() which
		 * counts xattr inode references.
		 */
		down_read(&EXT4_I(inode)->xattr_sem);
		err = __dquot_transfer(inode, transfer_to);
		up_read(&EXT4_I(inode)->xattr_sem);
		dqput(transfer_to[PRJQUOTA]);
		if (err)
			goto out_dirty;
	}

	EXT4_I(inode)->i_projid = kprojid;
	inode->i_ctime = current_time(inode);
out_dirty:
	rc = ext4_mark_iloc_dirty(handle, inode, &iloc);
	if (!err)
		err = rc;
out_stop:
	ext4_journal_stop(handle);
out_unlock:
	inode_unlock(inode);
	mnt_drop_write_file(filp);
	return err;
}

Example #2

File: ioctl.c Project: andy-shev/linux

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;

	if (!EXT4_HAS_RO_COMPAT_FEATURE(sb,
			EXT4_FEATURE_RO_COMPAT_PROJECT)) {
		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 = mnt_want_write_file(filp);
	if (err)
		return err;

	err = -EPERM;
	inode_lock(inode);
	/* Is it quota file? Do not allow user to mess with it */
	if (IS_NOQUOTA(inode))
		goto out_unlock;

	err = ext4_get_inode_loc(inode, &iloc);
	if (err)
		goto out_unlock;

	raw_inode = ext4_raw_inode(&iloc);
	if (!EXT4_FITS_IN_INODE(raw_inode, ei, i_projid)) {
		err = -EOVERFLOW;
		brelse(iloc.bh);
		goto out_unlock;
	}
	brelse(iloc.bh);

	dquot_initialize(inode);

	handle = ext4_journal_start(inode, EXT4_HT_QUOTA,
		EXT4_QUOTA_INIT_BLOCKS(sb) +
		EXT4_QUOTA_DEL_BLOCKS(sb) + 3);
	if (IS_ERR(handle)) {
		err = PTR_ERR(handle);
		goto out_unlock;
	}

	err = ext4_reserve_inode_write(handle, inode, &iloc);
	if (err)
		goto out_stop;

	if (sb_has_quota_limits_enabled(sb, PRJQUOTA)) {
		struct dquot *transfer_to[MAXQUOTAS] = { };

		transfer_to[PRJQUOTA] = dqget(sb, make_kqid_projid(kprojid));
		if (transfer_to[PRJQUOTA]) {
			err = __dquot_transfer(inode, transfer_to);
			dqput(transfer_to[PRJQUOTA]);
			if (err)
				goto out_dirty;
		}
	}
	EXT4_I(inode)->i_projid = kprojid;
	inode->i_ctime = ext4_current_time(inode);
out_dirty:
	rc = ext4_mark_iloc_dirty(handle, inode, &iloc);
	if (!err)
		err = rc;
out_stop:
	ext4_journal_stop(handle);
out_unlock:
	inode_unlock(inode);
	mnt_drop_write_file(filp);
	return err;
}