On Fri, Sep 01, 2017 at 10:50:02PM +0200, Christoph Hellwig wrote:
> Reject attempts to set XFLAGS that correspond to di_flags2 inode flags
> if the inode isn't a v3 inode, because di_flags2 only exists on v3.
>
> Signed-off-by: Christoph Hellwig <hch@xxxxxx>
Reviewed-by: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
> ---
> fs/xfs/xfs_ioctl.c | 38 +++++++++++++++++++++++++-------------
> 1 file changed, 25 insertions(+), 13 deletions(-)
>
> diff --git a/fs/xfs/xfs_ioctl.c b/fs/xfs/xfs_ioctl.c
> index 06ca244c323a..5049e8ab6e30 100644
> --- a/fs/xfs/xfs_ioctl.c
> +++ b/fs/xfs/xfs_ioctl.c
> @@ -931,16 +931,15 @@ xfs_ioc_fsgetxattr(
> return 0;
> }
>
> -STATIC void
> -xfs_set_diflags(
> +STATIC uint16_t
> +xfs_flags2diflags(
> struct xfs_inode *ip,
> unsigned int xflags)
> {
> - unsigned int di_flags;
> - uint64_t di_flags2;
> -
> /* can't set PREALLOC this way, just preserve it */
> - di_flags = (ip->i_d.di_flags & XFS_DIFLAG_PREALLOC);
> + uint16_t di_flags =
> + (ip->i_d.di_flags & XFS_DIFLAG_PREALLOC);
> +
> if (xflags & FS_XFLAG_IMMUTABLE)
> di_flags |= XFS_DIFLAG_IMMUTABLE;
> if (xflags & FS_XFLAG_APPEND)
> @@ -970,19 +969,24 @@ xfs_set_diflags(
> if (xflags & FS_XFLAG_EXTSIZE)
> di_flags |= XFS_DIFLAG_EXTSIZE;
> }
> - ip->i_d.di_flags = di_flags;
>
> - /* diflags2 only valid for v3 inodes. */
> - if (ip->i_d.di_version < 3)
> - return;
> + return di_flags;
> +}
> +
> +STATIC uint64_t
> +xfs_flags2diflags2(
> + struct xfs_inode *ip,
> + unsigned int xflags)
> +{
> + uint64_t di_flags2 =
> + (ip->i_d.di_flags2 & XFS_DIFLAG2_REFLINK);
>
> - di_flags2 = (ip->i_d.di_flags2 & XFS_DIFLAG2_REFLINK);
> if (xflags & FS_XFLAG_DAX)
> di_flags2 |= XFS_DIFLAG2_DAX;
> if (xflags & FS_XFLAG_COWEXTSIZE)
> di_flags2 |= XFS_DIFLAG2_COWEXTSIZE;
>
> - ip->i_d.di_flags2 = di_flags2;
> + return di_flags2;
> }
>
> STATIC void
> @@ -1023,6 +1027,7 @@ xfs_ioctl_setattr_xflags(
> struct fsxattr *fa)
> {
> struct xfs_mount *mp = ip->i_mount;
> + uint64_t di_flags2;
>
> /* Can't change realtime flag if any extents are allocated. */
> if ((ip->i_d.di_nextents || ip->i_delayed_blks) &&
> @@ -1053,7 +1058,14 @@ xfs_ioctl_setattr_xflags(
> !capable(CAP_LINUX_IMMUTABLE))
> return -EPERM;
>
> - xfs_set_diflags(ip, fa->fsx_xflags);
> + /* diflags2 only valid for v3 inodes. */
> + di_flags2 = xfs_flags2diflags2(ip, fa->fsx_xflags);
> + if (di_flags2 && ip->i_d.di_version < 3)
> + return -EINVAL;
> +
> + ip->i_d.di_flags = xfs_flags2diflags(ip, fa->fsx_xflags);
> + ip->i_d.di_flags2 = di_flags2;
> +
> xfs_diflags_to_linux(ip);
> xfs_trans_ichgtime(tp, ip, XFS_ICHGTIME_CHG);
> xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
> --
> 2.11.0
>
> --
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