On Tue, Jan 08, 2019 at 12:36:17PM -0800, Darrick J. Wong wrote:
> From: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
>
> Teach scrub to flag extent maps that exceed the range that can be mapped
> with a xfs_dablk_t.
>
> Signed-off-by: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
> ---
Reviewed-by: Brian Foster <bfoster@xxxxxxxxxx>
> fs/xfs/libxfs/xfs_types.c | 11 +++++++++++
> fs/xfs/libxfs/xfs_types.h | 1 +
> fs/xfs/scrub/bmap.c | 27 +++++++++++++++++++++++++++
> 3 files changed, 39 insertions(+)
>
>
> diff --git a/fs/xfs/libxfs/xfs_types.c b/fs/xfs/libxfs/xfs_types.c
> index 3306fc42cfad..451608b5a37b 100644
> --- a/fs/xfs/libxfs/xfs_types.c
> +++ b/fs/xfs/libxfs/xfs_types.c
> @@ -204,3 +204,14 @@ xfs_verify_icount(
> xfs_icount_range(mp, &min, &max);
> return icount >= min && icount <= max;
> }
> +
> +/* Sanity-checking of dir/attr block offsets. */
> +bool
> +xfs_verify_dablk(
> + struct xfs_mount *mp,
> + xfs_fileoff_t dabno)
> +{
> + xfs_dablk_t max_dablk = -1U;
> +
> + return dabno <= max_dablk;
> +}
> diff --git a/fs/xfs/libxfs/xfs_types.h b/fs/xfs/libxfs/xfs_types.h
> index 8f02855a019a..704b4f308780 100644
> --- a/fs/xfs/libxfs/xfs_types.h
> +++ b/fs/xfs/libxfs/xfs_types.h
> @@ -188,5 +188,6 @@ bool xfs_internal_inum(struct xfs_mount *mp, xfs_ino_t ino);
> bool xfs_verify_dir_ino(struct xfs_mount *mp, xfs_ino_t ino);
> bool xfs_verify_rtbno(struct xfs_mount *mp, xfs_rtblock_t rtbno);
> bool xfs_verify_icount(struct xfs_mount *mp, unsigned long long icount);
> +bool xfs_verify_dablk(struct xfs_mount *mp, xfs_fileoff_t off);
>
> #endif /* __XFS_TYPES_H__ */
> diff --git a/fs/xfs/scrub/bmap.c b/fs/xfs/scrub/bmap.c
> index e1d11f3223e3..a703cd58a90e 100644
> --- a/fs/xfs/scrub/bmap.c
> +++ b/fs/xfs/scrub/bmap.c
> @@ -281,6 +281,31 @@ xchk_bmap_extent_xref(
> xchk_ag_free(info->sc, &info->sc->sa);
> }
>
> +/*
> + * Directories and attr forks should never have blocks that can't be addressed
> + * by a xfs_dablk_t.
> + */
> +STATIC void
> +xchk_bmap_dirattr_extent(
> + struct xfs_inode *ip,
> + struct xchk_bmap_info *info,
> + struct xfs_bmbt_irec *irec)
> +{
> + struct xfs_mount *mp = ip->i_mount;
> + xfs_fileoff_t off;
> +
> + if (!S_ISDIR(VFS_I(ip)->i_mode) && info->whichfork != XFS_ATTR_FORK)
> + return;
> +
> + if (!xfs_verify_dablk(mp, irec->br_startoff))
> + xchk_fblock_set_corrupt(info->sc, info->whichfork,
> + irec->br_startoff);
> +
> + off = irec->br_startoff + irec->br_blockcount - 1;
> + if (!xfs_verify_dablk(mp, off))
> + xchk_fblock_set_corrupt(info->sc, info->whichfork, off);
> +}
> +
> /* Scrub a single extent record. */
> STATIC int
> xchk_bmap_extent(
> @@ -305,6 +330,8 @@ xchk_bmap_extent(
> xchk_fblock_set_corrupt(info->sc, info->whichfork,
> irec->br_startoff);
>
> + xchk_bmap_dirattr_extent(ip, info, irec);
> +
> /* There should never be a "hole" extent in either extent list. */
> if (irec->br_startblock == HOLESTARTBLOCK)
> xchk_fblock_set_corrupt(info->sc, info->whichfork,
>
