Re: [PATCH] xfs: don't ASSERT on corrupt ftype

[Brian Foster <bfoster@redhat.com>]

On Sun, Sep 07, 2014 at 08:06:35PM -0500, Eric Sandeen wrote:
> xfs_dir3_data_get_ftype() and xfs_dir2_sf_check() get
> the file type off disk, but ASSERT if it's invalid:
> 
> 	ASSERT(type < XFS_DIR3_FT_MAX);
> 
> This might be cut & paste from the "put" functions,
> which should be checking that they've not been passed
> bad values, but we shouldn't ASSERT on bad values
> read from disk.
> 

Does this lead to a problem of some kind in a valid configuration?

> Signed-off-by: Eric Sandeen <sandeen@redhat.com>
> ---
> 
> diff --git a/fs/xfs/libxfs/xfs_da_format.c b/fs/xfs/libxfs/xfs_da_format.c
> index c9aee52..7e42fdf 100644
> --- a/fs/xfs/libxfs/xfs_da_format.c
> +++ b/fs/xfs/libxfs/xfs_da_format.c
> @@ -270,7 +270,6 @@ xfs_dir3_data_get_ftype(
>  {
>  	__uint8_t	ftype = dep->name[dep->namelen];
> -	ASSERT(ftype < XFS_DIR3_FT_MAX);
>  	if (ftype >= XFS_DIR3_FT_MAX)
>  		return XFS_DIR3_FT_UNKNOWN;
>  	return ftype;
> diff --git a/fs/xfs/libxfs/xfs_dir2_sf.c b/fs/xfs/libxfs/xfs_dir2_sf.c
> index 5079e05..ea89250 100644
> --- a/fs/xfs/libxfs/xfs_dir2_sf.c
> +++ b/fs/xfs/libxfs/xfs_dir2_sf.c
> @@ -635,7 +635,6 @@ xfs_dir2_sf_check(
>  		offset =
>  			xfs_dir2_sf_get_offset(sfep) +
>  			dp->d_ops->data_entsize(sfep->namelen);
> -		ASSERT(dp->d_ops->sf_get_ftype(sfep) < XFS_DIR3_FT_MAX);

This one is a DEBUG mode only function and the comment suggests the
intent is to assert on directory inconsistency..?

Brian

>  	}
>  	ASSERT(i8count == sfp->i8count);
>  	ASSERT((char *)sfep - (char *)sfp == dp->i_d.di_size);
> 
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