int path_mount(const char *dev_name, struct path *path,
		const char *type_page, unsigned long flags, void *data_page)
{
	unsigned int mnt_flags = 0, sb_flags;
	int ret;

	/* Discard magic */
	if ((flags & MS_MGC_MSK) == MS_MGC_VAL)
		flags &= ~MS_MGC_MSK;

	/* Basic sanity checks */
	if (data_page)
		((char *)data_page)[PAGE_SIZE - 1] = 0;

	if (flags & MS_NOUSER)
		return -EINVAL;

	ret = security_sb_mount(dev_name, path, type_page, flags, data_page);
	if (ret)
		return ret;
	if (!may_mount())
		return -EPERM;
	if ((flags & SB_MANDLOCK) && !may_mandlock())
		return -EPERM;

	/* Default to relatime unless overriden */
	if (!(flags & MS_NOATIME))
		mnt_flags |= MNT_RELATIME;

	/* Separate the per-mountpoint flags */
	if (flags & MS_NOSUID)
		mnt_flags |= MNT_NOSUID;
	if (flags & MS_NODEV)
		mnt_flags |= MNT_NODEV;
	if (flags & MS_NOEXEC)
		mnt_flags |= MNT_NOEXEC;
	if (flags & MS_NOATIME)
		mnt_flags |= MNT_NOATIME;
	if (flags & MS_NODIRATIME)
		mnt_flags |= MNT_NODIRATIME;
	if (flags & MS_STRICTATIME)
		mnt_flags &= ~(MNT_RELATIME | MNT_NOATIME);
	if (flags & MS_RDONLY)
		mnt_flags |= MNT_READONLY;
	if (flags & MS_NOSYMFOLLOW)
		mnt_flags |= MNT_NOSYMFOLLOW;

	/* The default atime for remount is preservation */
	if ((flags & MS_REMOUNT) &&
	    ((flags & (MS_NOATIME | MS_NODIRATIME | MS_RELATIME |
		       MS_STRICTATIME)) == 0)) {
		mnt_flags &= ~MNT_ATIME_MASK;
		mnt_flags |= path->mnt->mnt_flags & MNT_ATIME_MASK;
	}

	sb_flags = flags & (SB_RDONLY |
			    SB_SYNCHRONOUS |
			    SB_MANDLOCK |
			    SB_DIRSYNC |
			    SB_SILENT |
			    SB_POSIXACL |
			    SB_LAZYTIME |
			    SB_I_VERSION);

	if ((flags & (MS_REMOUNT | MS_BIND)) == (MS_REMOUNT | MS_BIND))
		return do_reconfigure_mnt(path, mnt_flags);
	if (flags & MS_REMOUNT)
		return do_remount(path, flags, sb_flags, mnt_flags, data_page);
	if (flags & MS_BIND)
		return do_loopback(path, dev_name, flags & MS_REC);
	if (flags & (MS_SHARED | MS_PRIVATE | MS_SLAVE | MS_UNBINDABLE))
		return do_change_type(path, flags);
	if (flags & MS_MOVE)
		return do_move_mount_old(path, dev_name);

	return do_new_mount(path, type_page, sb_flags, mnt_flags, dev_name,
			    data_page);
}
int path_mount(const char *dev_name, struct path *path,
		const char *type_page, unsigned long flags, void *data_page)
{
	unsigned int mnt_flags = 0, sb_flags;
	int ret;

	 
	if ((flags & MS_MGC_MSK) == MS_MGC_VAL)
		flags &= ~MS_MGC_MSK;

	 
	if (data_page)
		((char *)data_page)[PAGE_SIZE - 1] = 0;

	if (flags & MS_NOUSER)
		return -EINVAL;

	ret = security_sb_mount(dev_name, path, type_page, flags, data_page);
	if (ret)
		return ret;
	if (!may_mount())
		return -EPERM;
	if ((flags & SB_MANDLOCK) && !may_mandlock())
		return -EPERM;

	 
	if (!(flags & MS_NOATIME))
		mnt_flags |= MNT_RELATIME;

	 
	if (flags & MS_NOSUID)
		mnt_flags |= MNT_NOSUID;
	if (flags & MS_NODEV)
		mnt_flags |= MNT_NODEV;
	if (flags & MS_NOEXEC)
		mnt_flags |= MNT_NOEXEC;
	if (flags & MS_NOATIME)
		mnt_flags |= MNT_NOATIME;
	if (flags & MS_NODIRATIME)
		mnt_flags |= MNT_NODIRATIME;
	if (flags & MS_STRICTATIME)
		mnt_flags &= ~(MNT_RELATIME | MNT_NOATIME);
	if (flags & MS_RDONLY)
		mnt_flags |= MNT_READONLY;
	if (flags & MS_NOSYMFOLLOW)
		mnt_flags |= MNT_NOSYMFOLLOW;

	 
	if ((flags & MS_REMOUNT) &&
	    ((flags & (MS_NOATIME | MS_NODIRATIME | MS_RELATIME |
		       MS_STRICTATIME)) == 0)) {
		mnt_flags &= ~MNT_ATIME_MASK;
		mnt_flags |= path->mnt->mnt_flags & MNT_ATIME_MASK;
	}

	sb_flags = flags & (SB_RDONLY |
			    SB_SYNCHRONOUS |
			    SB_MANDLOCK |
			    SB_DIRSYNC |
			    SB_SILENT |
			    SB_POSIXACL |
			    SB_LAZYTIME |
			    SB_I_VERSION);

	if ((flags & (MS_REMOUNT | MS_BIND)) == (MS_REMOUNT | MS_BIND))
		return do_reconfigure_mnt(path, mnt_flags);
	if (flags & MS_REMOUNT)
		return do_remount(path, flags, sb_flags, mnt_flags, data_page);
	if (flags & MS_BIND)
		return do_loopback(path, dev_name, flags & MS_REC);
	if (flags & (MS_SHARED | MS_PRIVATE | MS_SLAVE | MS_UNBINDABLE))
		return do_change_type(path, flags);
	if (flags & MS_MOVE)
		return do_move_mount_old(path, dev_name);

	return do_new_mount(path, type_page, sb_flags, mnt_flags, dev_name,
			    data_page);
}