linux-kernel - Re: [PATCH 1/4] fs/notify: fdinfo can report unsupported file handles.

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Date:   Mon, 11 Dec 2017 06:29:47 +0000
From:   Al Viro <viro@...IV.linux.org.uk>
To:     NeilBrown <neilb@...e.com>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        linux-fsdevel@...r.kernel.org, linux-nfs@...r.kernel.org,
        Amir Goldstein <amir73il@...il.com>,
        lkml <linux-kernel@...r.kernel.org>,
        Lennart Poettering <lennart@...ttering.net>
Subject: Re: [PATCH 1/4] fs/notify: fdinfo can report unsupported file
 handles.

On Mon, Dec 11, 2017 at 05:04:05PM +1100, NeilBrown wrote:
> @@ -385,7 +385,9 @@ int exportfs_encode_inode_fh(struct inode *inode, struct fid *fid,
>  {
>  	const struct export_operations *nop = inode->i_sb->s_export_op;
>  
> -	if (nop && nop->encode_fh)
> +	if (nop)
> +		return FILEID_INVALID;
> +	if (nop->encode_fh)
>  		return nop->encode_fh(inode, fid->raw, max_len, parent);

This might as well have been

	if (nop)
		return FILEID_INVALID;
	BUG();

Have you ever tested that?