[Linux-cachefs] [PATCH 03/11] cachefiles: set default tag name if it's unspecified

[Jeff Layton]

On Tue, 2022-01-18 at 13:53 +0000, David Howells wrote:
> From: Jeffle Xu <jefflexu at linux.alibaba.com>
> 
> fscache_acquire_cache() requires a non-empty name, while 'tag <name>'
> command is optional for cachefilesd.
> 
> Thus set default tag name if it's unspecified to avoid the regression of
> cachefilesd. The logic is the same with that before rewritten.
> 
> Signed-off-by: Jeffle Xu <jefflexu at linux.alibaba.com>
> Signed-off-by: David Howells <dhowells at redhat.com>
> cc: linux-cachefs at redhat.com
> ---
> 
>  fs/cachefiles/daemon.c |   11 +++++++++++
>  1 file changed, 11 insertions(+)
> 
> diff --git a/fs/cachefiles/daemon.c b/fs/cachefiles/daemon.c
> index 40a792421fc1..7ac04ee2c0a0 100644
> --- a/fs/cachefiles/daemon.c
> +++ b/fs/cachefiles/daemon.c
> @@ -703,6 +703,17 @@ static int cachefiles_daemon_bind(struct cachefiles_cache *cache, char *args)
>  		return -EBUSY;
>  	}
>  
> +	/* Make sure we have copies of the tag string */
> +	if (!cache->tag) {
> +		/*
> +		 * The tag string is released by the fops->release()
> +		 * function, so we don't release it on error here
> +		 */
> +		cache->tag = kstrdup("CacheFiles", GFP_KERNEL);
> +		if (!cache->tag)
> +			return -ENOMEM;
> +	}
> +
>  	return cachefiles_add_cache(cache);
>  }
>  
> 
> 

Reviewed-by: Jeff Layton <jlayton at kernel.org>