linux-kernel - Re: [PATCH 03/11] cachefiles: set default tag name if it's unspecified

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Message-ID: <d99c4042fa900187b179b9087981b25c22edd645.camel@kernel.org>
Date:   Fri, 21 Jan 2022 12:51:27 -0500
From:   Jeff Layton <jlayton@...nel.org>
To:     David Howells <dhowells@...hat.com>, linux-cachefs@...hat.com
Cc:     Jeffle Xu <jefflexu@...ux.alibaba.com>,
        Trond Myklebust <trondmy@...merspace.com>,
        Anna Schumaker <anna.schumaker@...app.com>,
        Steve French <smfrench@...il.com>,
        Dominique Martinet <asmadeus@...ewreck.org>,
        Matthew Wilcox <willy@...radead.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Omar Sandoval <osandov@...ndov.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        linux-afs@...ts.infradead.org, linux-nfs@...r.kernel.org,
        linux-cifs@...r.kernel.org, ceph-devel@...r.kernel.org,
        v9fs-developer@...ts.sourceforge.net,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 03/11] cachefiles: set default tag name if it's
 unspecified

On Tue, 2022-01-18 at 13:53 +0000, David Howells wrote:
> From: Jeffle Xu <jefflexu@...ux.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@...ux.alibaba.com>
> Signed-off-by: David Howells <dhowells@...hat.com>
> cc: linux-cachefs@...hat.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@...nel.org>