xfs_ioctl.c

linux-2.4.29操作系统的源码

	vn_trace_entry(vp, "xfs_ioctl", (inst_t *)__return_address);

	ip = XFS_BHVTOI(bdp);
	mp = ip->i_mount;

	switch (cmd) {

	case XFS_IOC_ALLOCSP:
	case XFS_IOC_FREESP:
	case XFS_IOC_RESVSP:
	case XFS_IOC_UNRESVSP:
	case XFS_IOC_ALLOCSP64:
	case XFS_IOC_FREESP64:
	case XFS_IOC_RESVSP64:
	case XFS_IOC_UNRESVSP64:
		/*
		 * Only allow the sys admin to reserve space unless
		 * unwritten extents are enabled.
		 */
		if (!XFS_SB_VERSION_HASEXTFLGBIT(&mp->m_sb) &&
		    !capable(CAP_SYS_ADMIN))
			return -EPERM;

		return xfs_ioc_space(bdp, vp, filp, ioflags, cmd, arg);

	case XFS_IOC_DIOINFO: {
		struct dioattr	da;

		da.d_miniosz = mp->m_sb.sb_blocksize;
		da.d_mem = mp->m_sb.sb_blocksize;

		/*
		 * this only really needs to be BBSIZE.
		 * it is set to the file system block size to
		 * avoid having to do block zeroing on short writes.
		 */
		da.d_maxiosz = XFS_FSB_TO_B(mp,
				XFS_B_TO_FSBT(mp, KIO_MAX_ATOMIC_IO << 10));

		if (copy_to_user((struct dioattr *)arg, &da, sizeof(da)))
			return -XFS_ERROR(EFAULT);
		return 0;
	}

	case XFS_IOC_FSBULKSTAT_SINGLE:
	case XFS_IOC_FSBULKSTAT:
	case XFS_IOC_FSINUMBERS:
		return xfs_ioc_bulkstat(mp, cmd, arg);

	case XFS_IOC_FSGEOMETRY_V1:
		return xfs_ioc_fsgeometry_v1(mp, arg);

	case XFS_IOC_FSGEOMETRY:
		return xfs_ioc_fsgeometry(mp, arg);

	case XFS_IOC_GETVERSION:
	case XFS_IOC_GETXFLAGS:
	case XFS_IOC_SETXFLAGS:
	case XFS_IOC_FSGETXATTR:
	case XFS_IOC_FSSETXATTR:
	case XFS_IOC_FSGETXATTRA:
		return xfs_ioc_xattr(vp, ip, filp, cmd, arg);

	case XFS_IOC_FSSETDM: {
		struct fsdmidata	dmi;

		if (copy_from_user(&dmi, (struct fsdmidata *)arg, sizeof(dmi)))
			return -XFS_ERROR(EFAULT);

		error = xfs_set_dmattrs(bdp, dmi.fsd_dmevmask, dmi.fsd_dmstate,
							NULL);
		return -error;
	}

	case XFS_IOC_GETBMAP:
	case XFS_IOC_GETBMAPA:
		return xfs_ioc_getbmap(bdp, filp, ioflags, cmd, arg);

	case XFS_IOC_GETBMAPX:
		return xfs_ioc_getbmapx(bdp, arg);

	case XFS_IOC_FD_TO_HANDLE:
	case XFS_IOC_PATH_TO_HANDLE:
	case XFS_IOC_PATH_TO_FSHANDLE:
		return xfs_find_handle(cmd, arg);

	case XFS_IOC_OPEN_BY_HANDLE:
		return xfs_open_by_handle(mp, arg, filp, inode);

	case XFS_IOC_FSSETDM_BY_HANDLE:
		return xfs_fssetdm_by_handle(mp, arg, filp, inode);

	case XFS_IOC_READLINK_BY_HANDLE:
		return xfs_readlink_by_handle(mp, arg, filp, inode);

	case XFS_IOC_ATTRLIST_BY_HANDLE:
		return xfs_attrlist_by_handle(mp, arg, filp, inode);

	case XFS_IOC_ATTRMULTI_BY_HANDLE:
		return xfs_attrmulti_by_handle(mp, arg, filp, inode);

	case XFS_IOC_SWAPEXT: {
		error = xfs_swapext((struct xfs_swapext *)arg);
		return -error;
	}

	case XFS_IOC_FSCOUNTS: {
		xfs_fsop_counts_t out;

		error = xfs_fs_counts(mp, &out);
		if (error)
			return -error;

		if (copy_to_user((char *)arg, &out, sizeof(out)))
			return -XFS_ERROR(EFAULT);
		return 0;
	}

	case XFS_IOC_SET_RESBLKS: {
		xfs_fsop_resblks_t inout;
		__uint64_t	   in;

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

		if (copy_from_user(&inout, (char *)arg, sizeof(inout)))
			return -XFS_ERROR(EFAULT);

		/* input parameter is passed in resblks field of structure */
		in = inout.resblks;
		error = xfs_reserve_blocks(mp, &in, &inout);
		if (error)
			return -error;

		if (copy_to_user((char *)arg, &inout, sizeof(inout)))
			return -XFS_ERROR(EFAULT);
		return 0;
	}

	case XFS_IOC_GET_RESBLKS: {
		xfs_fsop_resblks_t out;

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

		error = xfs_reserve_blocks(mp, NULL, &out);
		if (error)
			return -error;

		if (copy_to_user((char *)arg, &out, sizeof(out)))
			return -XFS_ERROR(EFAULT);

		return 0;
	}

	case XFS_IOC_FSGROWFSDATA: {
		xfs_growfs_data_t in;

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

		if (copy_from_user(&in, (char *)arg, sizeof(in)))
			return -XFS_ERROR(EFAULT);

		error = xfs_growfs_data(mp, &in);
		return -error;
	}

	case XFS_IOC_FSGROWFSLOG: {
		xfs_growfs_log_t in;

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

		if (copy_from_user(&in, (char *)arg, sizeof(in)))
			return -XFS_ERROR(EFAULT);

		error = xfs_growfs_log(mp, &in);
		return -error;
	}

	case XFS_IOC_FSGROWFSRT: {
		xfs_growfs_rt_t in;

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

		if (copy_from_user(&in, (char *)arg, sizeof(in)))
			return -XFS_ERROR(EFAULT);

		error = xfs_growfs_rt(mp, &in);
		return -error;
	}

	case XFS_IOC_FREEZE:
		if (!capable(CAP_SYS_ADMIN))
			return -EPERM;

		if (vp->v_vfsp->vfs_frozen == SB_UNFROZEN) {
			freeze_bdev(mp->m_ddev_targp->pbr_bdev);
			if (mp->m_rtdev_targp)
				freeze_bdev(mp->m_rtdev_targp->pbr_bdev);
		}
		return 0;

	case XFS_IOC_THAW:
		if (!capable(CAP_SYS_ADMIN))
			return -EPERM;

		if (vp->v_vfsp->vfs_frozen != SB_UNFROZEN) {
			thaw_bdev(mp->m_ddev_targp->pbr_bdev, inode->i_sb);
			if (mp->m_rtdev_targp)
				thaw_bdev(mp->m_ddev_targp->pbr_bdev, NULL);
		}
		return 0;

	case XFS_IOC_GOINGDOWN: {
		__uint32_t in;

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

		if (get_user(in, (__uint32_t *)arg))
			return -XFS_ERROR(EFAULT);

		error = xfs_fs_goingdown(mp, in);
		return -error;
	}

	case XFS_IOC_ERROR_INJECTION: {
		xfs_error_injection_t in;

		if (!capable(CAP_SYS_ADMIN))
			return EPERM;

		if (copy_from_user(&in, (char *)arg, sizeof(in)))
			return -XFS_ERROR(EFAULT);

		error = xfs_errortag_add(in.errtag, mp);
		return -error;
	}

	case XFS_IOC_ERROR_CLEARALL:
		if (!capable(CAP_SYS_ADMIN))
			return -EPERM;

		error = xfs_errortag_clearall(mp);
		return -error;

	default:
		return -ENOTTY;
	}
}

STATIC int
xfs_ioc_space(
	bhv_desc_t		*bdp,
	vnode_t			*vp,
	struct file		*filp,
	int			ioflags,
	unsigned int		cmd,
	unsigned long		arg)
{
	xfs_flock64_t		bf;
	int			attr_flags = 0;
	int			error;

	if (vp->v_inode.i_flags & (S_IMMUTABLE|S_APPEND))
		return -XFS_ERROR(EPERM);

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

	if (vp->v_type != VREG)
		return -XFS_ERROR(EINVAL);

	if (copy_from_user(&bf, (xfs_flock64_t *)arg, sizeof(bf)))
		return -XFS_ERROR(EFAULT);

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

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

STATIC int
xfs_ioc_bulkstat(
	xfs_mount_t		*mp,
	unsigned int		cmd,
	unsigned long		arg)
{
	xfs_fsop_bulkreq_t	bulkreq;
	int			count;	/* # of records returned */
	xfs_ino_t		inlast;	/* last inode number */
	int			done;
	int			error;

	/* done = 1 if there are more stats to get and if bulkstat */
	/* should be called again (unused here, but used in dmapi) */

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

	if (XFS_FORCED_SHUTDOWN(mp))
		return -XFS_ERROR(EIO);

	if (copy_from_user(&bulkreq, (xfs_fsop_bulkreq_t *)arg,
					sizeof(xfs_fsop_bulkreq_t)))
		return -XFS_ERROR(EFAULT);

	if (copy_from_user(&inlast, (__s64 *)bulkreq.lastip,
						sizeof(__s64)))
		return -XFS_ERROR(EFAULT);

	if ((count = bulkreq.icount) <= 0)
		return -XFS_ERROR(EINVAL);

	if (cmd == XFS_IOC_FSINUMBERS)
		error = xfs_inumbers(mp, &inlast, &count,
						bulkreq.ubuffer);
	else if (cmd == XFS_IOC_FSBULKSTAT_SINGLE)
		error = xfs_bulkstat_single(mp, &inlast,
						bulkreq.ubuffer, &done);
	else {	/* XFS_IOC_FSBULKSTAT */
		if (count == 1 && inlast != 0) {
			inlast++;
			error = xfs_bulkstat_single(mp, &inlast,
					bulkreq.ubuffer, &done);
		} else {
			error = xfs_bulkstat(mp, &inlast, &count,
				(bulkstat_one_pf)xfs_bulkstat_one, NULL,
				sizeof(xfs_bstat_t), bulkreq.ubuffer,
				BULKSTAT_FG_QUICK, &done);
		}
	}

	if (error)
		return -error;

	if (bulkreq.ocount != NULL) {
		if (copy_to_user((xfs_ino_t *)bulkreq.lastip, &inlast,
						sizeof(xfs_ino_t)))
			return -XFS_ERROR(EFAULT);

		if (copy_to_user((__s32 *)bulkreq.ocount, &count,
						sizeof(count)))
			return -XFS_ERROR(EFAULT);
	}

	return 0;
}

STATIC int
xfs_ioc_fsgeometry_v1(
	xfs_mount_t		*mp,
	unsigned long		arg)
{
	xfs_fsop_geom_v1_t	fsgeo;
	int			error;

	error = xfs_fs_geometry(mp, (xfs_fsop_geom_t *)&fsgeo, 3);
	if (error)
		return -error;

	if (copy_to_user((xfs_fsop_geom_t *)arg, &fsgeo, sizeof(fsgeo)))
		return -XFS_ERROR(EFAULT);
	return 0;
}

STATIC int
xfs_ioc_fsgeometry(
	xfs_mount_t		*mp,
	unsigned long		arg)
{
	xfs_fsop_geom_t		fsgeo;
	int			error;

	error = xfs_fs_geometry(mp, &fsgeo, 4);
	if (error)
		return -error;

	if (copy_to_user((xfs_fsop_geom_t *)arg, &fsgeo, sizeof(fsgeo)))
		return -XFS_ERROR(EFAULT);
	return 0;
}

/*
 * Linux extended inode flags interface.
 */
#define LINUX_XFLAG_SYNC	0x00000008 /* Synchronous updates */
#define LINUX_XFLAG_IMMUTABLE	0x00000010 /* Immutable file */
#define LINUX_XFLAG_APPEND	0x00000020 /* writes to file may only append */
#define LINUX_XFLAG_NODUMP	0x00000040 /* do not dump file */
#define LINUX_XFLAG_NOATIME	0x00000080 /* do not update atime */

STATIC unsigned int
xfs_merge_ioc_xflags(
	unsigned int	flags,
	unsigned int	start)
{
	unsigned int	xflags = start;

	if (flags & LINUX_XFLAG_IMMUTABLE)
		xflags |= XFS_XFLAG_IMMUTABLE;
	else
		xflags &= ~XFS_XFLAG_IMMUTABLE;
	if (flags & LINUX_XFLAG_APPEND)
		xflags |= XFS_XFLAG_APPEND;
	else
		xflags &= ~XFS_XFLAG_APPEND;
	if (flags & LINUX_XFLAG_SYNC)
		xflags |= XFS_XFLAG_SYNC;
	else
		xflags &= ~XFS_XFLAG_SYNC;
	if (flags & LINUX_XFLAG_NOATIME)
		xflags |= XFS_XFLAG_NOATIME;
	else
		xflags &= ~XFS_XFLAG_NOATIME;
	if (flags & LINUX_XFLAG_NODUMP)
		xflags |= XFS_XFLAG_NODUMP;
	else
		xflags &= ~XFS_XFLAG_NODUMP;

	return xflags;
}

STATIC unsigned int
xfs_di2lxflags(
	__uint16_t	di_flags)
{
	unsigned int	flags = 0;

	if (di_flags & XFS_DIFLAG_IMMUTABLE)
		flags |= LINUX_XFLAG_IMMUTABLE;
	if (di_flags & XFS_DIFLAG_APPEND)
		flags |= LINUX_XFLAG_APPEND;
	if (di_flags & XFS_DIFLAG_SYNC)
		flags |= LINUX_XFLAG_SYNC;
	if (di_flags & XFS_DIFLAG_NOATIME)
		flags |= LINUX_XFLAG_NOATIME;
	if (di_flags & XFS_DIFLAG_NODUMP)
		flags |= LINUX_XFLAG_NODUMP;
	return flags;
}

STATIC int
xfs_ioc_xattr(
	vnode_t			*vp,
	xfs_inode_t		*ip,
	struct file		*filp,
	unsigned int		cmd,
	unsigned long		arg)
{
	struct fsxattr		fa;
	vattr_t			va;
	int			error;
	int			attr_flags;
	unsigned int		flags;

	switch (cmd) {
	case XFS_IOC_FSGETXATTR: {
		va.va_mask = XFS_AT_XFLAGS|XFS_AT_EXTSIZE|XFS_AT_NEXTENTS;
		VOP_GETATTR(vp, &va, 0, NULL, error);
		if (error)
			return -error;

		fa.fsx_xflags	= va.va_xflags;
		fa.fsx_extsize	= va.va_extsize;
		fa.fsx_nextents = va.va_nextents;

		if (copy_to_user((struct fsxattr *)arg, &fa, sizeof(fa)))
			return -XFS_ERROR(EFAULT);
		return 0;
	}

	case XFS_IOC_FSSETXATTR: {
		if (copy_from_user(&fa, (struct fsxattr *)arg, sizeof(fa)))
			return -XFS_ERROR(EFAULT);

		attr_flags = 0;
		if (filp->f_flags & (O_NDELAY|O_NONBLOCK))
			attr_flags |= ATTR_NONBLOCK;

		va.va_mask = XFS_AT_XFLAGS | XFS_AT_EXTSIZE;
		va.va_xflags  = fa.fsx_xflags;
		va.va_extsize = fa.fsx_extsize;

		VOP_SETATTR(vp, &va, attr_flags, NULL, error);
		if (!error)
			vn_revalidate(vp);	/* update Linux inode flags */
		return -error;
	}

	case XFS_IOC_FSGETXATTRA: {
		va.va_mask = XFS_AT_XFLAGS|XFS_AT_EXTSIZE|XFS_AT_ANEXTENTS;
		VOP_GETATTR(vp, &va, 0, NULL, error);
		if (error)
			return -error;

		fa.fsx_xflags	= va.va_xflags;
		fa.fsx_extsize	= va.va_extsize;
		fa.fsx_nextents = va.va_anextents;

		if (copy_to_user((struct fsxattr *)arg, &fa, sizeof(fa)))
			return -XFS_ERROR(EFAULT);
		return 0;
	}

	case XFS_IOC_GETXFLAGS: {
		flags = xfs_di2lxflags(ip->i_d.di_flags);
		if (copy_to_user((unsigned int *)arg, &flags, sizeof(flags)))
			return -XFS_ERROR(EFAULT);
		return 0;
	}

	case XFS_IOC_SETXFLAGS: {
		if (copy_from_user(&flags, (unsigned int *)arg, sizeof(flags)))
			return -XFS_ERROR(EFAULT);

		if (flags & ~(LINUX_XFLAG_IMMUTABLE | LINUX_XFLAG_APPEND | \
			      LINUX_XFLAG_NOATIME | LINUX_XFLAG_NODUMP | \
			      LINUX_XFLAG_SYNC))
			return -XFS_ERROR(EOPNOTSUPP);

		attr_flags = 0;
		if (filp->f_flags & (O_NDELAY|O_NONBLOCK))
			attr_flags |= ATTR_NONBLOCK;

		va.va_mask = XFS_AT_XFLAGS;
		va.va_xflags = xfs_merge_ioc_xflags(flags,
				xfs_dic2xflags(&ip->i_d, ARCH_NOCONVERT));

		VOP_SETATTR(vp, &va, attr_flags, NULL, error);
		if (!error)
			vn_revalidate(vp);	/* update Linux inode flags */
		return -error;
	}

	case XFS_IOC_GETVERSION: {
		flags = LINVFS_GET_IP(vp)->i_generation;
		if (copy_to_user((unsigned int *)arg, &flags, sizeof(flags)))
			return -XFS_ERROR(EFAULT);
		return 0;
	}

	default:
		return -ENOTTY;
	}
}

STATIC int
xfs_ioc_getbmap(
	bhv_desc_t		*bdp,
	struct file		*filp,
	int			ioflags,
	unsigned int		cmd,
	unsigned long		arg)
{
	struct getbmap		bm;
	int			iflags;
	int			error;

	if (copy_from_user(&bm, (struct getbmap *)arg, sizeof(bm)))
		return -XFS_ERROR(EFAULT);

	if (bm.bmv_count < 2)
		return -XFS_ERROR(EINVAL);

	iflags = (cmd == XFS_IOC_GETBMAPA ? BMV_IF_ATTRFORK : 0);
	if (ioflags & IO_INVIS)
		iflags |= BMV_IF_NO_DMAPI_READ;

	error = xfs_getbmap(bdp, &bm, (struct getbmap *)arg+1, iflags);
	if (error)
		return -error;

	if (copy_to_user((struct getbmap *)arg, &bm, sizeof(bm)))
		return -XFS_ERROR(EFAULT);
	return 0;
}

STATIC int
xfs_ioc_getbmapx(
	bhv_desc_t		*bdp,
	unsigned long		arg)
{
	struct getbmapx		bmx;
	struct getbmap		bm;
	int			iflags;
	int			error;

	if (copy_from_user(&bmx, (struct getbmapx *)arg, sizeof(bmx)))
		return -XFS_ERROR(EFAULT);

	if (bmx.bmv_count < 2)
		return -XFS_ERROR(EINVAL);

	/*
	 * Map input getbmapx structure to a getbmap
	 * structure for xfs_getbmap.
	 */
	GETBMAP_CONVERT(bmx, bm);

	iflags = bmx.bmv_iflags;

	if (iflags & (~BMV_IF_VALID))
		return -XFS_ERROR(EINVAL);

	iflags |= BMV_IF_EXTENDED;

	error = xfs_getbmap(bdp, &bm, (struct getbmapx *)arg+1, iflags);
	if (error)
		return -error;

	GETBMAP_CONVERT(bm, bmx);

	if (copy_to_user((struct getbmapx *)arg, &bmx, sizeof(bmx)))
		return -XFS_ERROR(EFAULT);

	return 0;
}