Re: [PATCH] VFS: allow ->d_manage() to declare -EISDIR in rcu_walk mode.

[Dan Carpenter <dan.carpenter@oracle.com>]

On Wed, Jul 30, 2014 at 04:08:33PM +1000, NeilBrown wrote:
> @@ -1110,11 +1110,16 @@ static bool __follow_mount_rcu(struct nameidata *nd, struct path *path,
>  		 * Don't forget we might have a non-mountpoint managed dentry
>  		 * that wants to block transit.
>  		 */
> -		if (unlikely(managed_dentry_might_block(path->dentry)))
> +		switch (managed_dentry_rcu(path->dentry)) {
> +		case -ECHILD:
> +		default:
>  			return false;
> +		case -EISDIR:
> +			return true;
> +		}
>  

Smatch says that any lines after that switch statement are unreachable.

Is the "default" intended?

>  		if (!d_mountpoint(path->dentry))
> -			return true;
> +			return !(path->dentry->d_flags & DCACHE_NEED_AUTOMOUNT);
>  
>  		mounted = __lookup_mnt(path->mnt, path->dentry);
>  		if (!mounted)

regards,
dan carpenter