Re: [PATCH 23/31] xfs: properly type the buffer field in struct xfs_fsop_attrlist_handlereq

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On Mon, Feb 17, 2020 at 01:59:49PM +0100, Christoph Hellwig wrote:
> The buffer field always points to a strut xfs_attrlist, so use the
> proper type.
> 
> Signed-off-by: Christoph Hellwig <hch@xxxxxx>
> ---
>  fs/xfs/libxfs/xfs_fs.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/fs/xfs/libxfs/xfs_fs.h b/fs/xfs/libxfs/xfs_fs.h
> index ae77bcd8c05b..21920f613d42 100644
> --- a/fs/xfs/libxfs/xfs_fs.h
> +++ b/fs/xfs/libxfs/xfs_fs.h
> @@ -597,7 +597,7 @@ typedef struct xfs_fsop_attrlist_handlereq {
>  	struct xfs_attrlist_cursor	pos; /* opaque cookie, list offset */
>  	__u32				flags;	/* which namespace to use */
>  	__u32				buflen;	/* length of buffer supplied */
> -	void				__user *buffer;	/* returned names */
> +	struct xfs_attrlist __user	*buffer;/* returned names */
>  } xfs_fsop_attrlist_handlereq_t;

This changes the userspace API, right? So, in theory, it could break
compilation of userspace applications that treat it as an attrlist_t
and don't specifically cast the assignment because it's currently
a void pointer?

Cheers,

Dave.
-- 
Dave Chinner
david@xxxxxxxxxxxxx



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