C++ (Cpp) xfs_change_file_space Examples

Example #1

File: xfs_ioctl.c Project: A2109devs/lenovo_a2109a_kernel

int
xfs_ioc_space(
	struct xfs_inode	*ip,
	struct inode		*inode,
	struct file		*filp,
	int			ioflags,
	unsigned int		cmd,
	xfs_flock64_t		*bf)
{
	int			attr_flags = 0;
	int			error;

	/*
	 * Only allow the sys admin to reserve space unless
	 * unwritten extents are enabled.
	 */
	if (!xfs_sb_version_hasextflgbit(&ip->i_mount->m_sb) &&
	    !capable(CAP_SYS_ADMIN))
		return -XFS_ERROR(EPERM);

	if (inode->i_flags & (S_IMMUTABLE|S_APPEND))
		return -XFS_ERROR(EPERM);

	if (!(filp->f_mode & FMODE_WRITE))
		return -XFS_ERROR(EBADF);

	if (!S_ISREG(inode->i_mode))
		return -XFS_ERROR(EINVAL);

	if (filp->f_flags & (O_NDELAY|O_NONBLOCK))
		attr_flags |= XFS_ATTR_NONBLOCK;
	if (ioflags & IO_INVIS)
		attr_flags |= XFS_ATTR_DMI;

	error = xfs_change_file_space(ip, cmd, bf, filp->f_pos, attr_flags);
	return -error;
}

Example #2

STATIC long
xfs_vn_fallocate(
	struct inode	*inode,
	int		mode,
	loff_t		offset,
	loff_t		len)
{
	long		error;
	loff_t		new_size = 0;
	xfs_flock64_t	bf;
	xfs_inode_t	*ip = XFS_I(inode);
	int		cmd = XFS_IOC_RESVSP;
	int		attr_flags = XFS_ATTR_NOLOCK;

	if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE))
		return -EOPNOTSUPP;

	/* preallocation on directories not yet supported */
	error = -ENODEV;
	if (S_ISDIR(inode->i_mode))
		goto out_error;

	bf.l_whence = 0;
	bf.l_start = offset;
	bf.l_len = len;

	xfs_ilock(ip, XFS_IOLOCK_EXCL);

	if (mode & FALLOC_FL_PUNCH_HOLE)
		cmd = XFS_IOC_UNRESVSP;

	/* check the new inode size is valid before allocating */
	if (!(mode & FALLOC_FL_KEEP_SIZE) &&
	    offset + len > i_size_read(inode)) {
		new_size = offset + len;
		error = inode_newsize_ok(inode, new_size);
		if (error)
			goto out_unlock;
	}

	/*
	 * RHEL6 porting note: mainline only does sync preallocations here on
	 * O_SYNC files as it is passed a filp and can check this. For RHEL6,
	 * just default to the old "always sync" behaviour as we cannot work
	 * out if we are operating in a sync context or not.
	 */
	attr_flags |= XFS_ATTR_SYNC;

	error = -xfs_change_file_space(ip, cmd, &bf, 0, attr_flags);
	if (error)
		goto out_unlock;

	/* Change file size if needed */
	if (new_size) {
		struct iattr iattr;

		iattr.ia_valid = ATTR_SIZE;
		iattr.ia_size = new_size;
		error = -xfs_setattr(ip, &iattr, XFS_ATTR_NOLOCK);
	}

out_unlock:
	xfs_iunlock(ip, XFS_IOLOCK_EXCL);
out_error:
	return error;
}