linux-kernel - Re: [PATCH] fscache: Fix error handling in fscache_begin

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Date: Fri, 15 Mar 2024 14:34:27 -0400
From: Jeff Layton <jlayton@...nel.org>
To: David Howells <dhowells@...hat.com>
Cc: Marc Dionne <marc.dionne@...istor.com>, Christian Brauner
 <brauner@...nel.org>, netfs@...ts.linux.dev, linux-fsdevel@...r.kernel.org,
  linux-kernel@...r.kernel.org
Subject: Re: [PATCH] fscache: Fix error handling in fscache_begin_operation()

On Fri, 2024-03-15 at 14:48 +0000, David Howells wrote:
>     
> Fix fscache_begin_operation() to clear cres->cache_priv on error, otherwise
> fscache_resources_valid() will report it as being valid.
> 
> Signed-off-by: David Howells <dhowells@...hat.com>
> Reported-by: Marc Dionne <marc.dionne@...istor.com>
> cc: Jeff Layton <jlayton@...nel.org>
> cc: netfs@...ts.linux.dev
> cc: linux-fsdevel@...r.kernel.org
> ---
>  fs/netfs/fscache_io.c |    4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/fs/netfs/fscache_io.c b/fs/netfs/fscache_io.c
> index ad57e4412c6d..cfd58ad95e7c 100644
> --- a/fs/netfs/fscache_io.c
> +++ b/fs/netfs/fscache_io.c
> @@ -83,8 +83,10 @@ static int fscache_begin_operation(struct netfs_cache_resources *cres,
>  	cres->debug_id		= cookie->debug_id;
>  	cres->inval_counter	= cookie->inval_counter;
>  
> -	if (!fscache_begin_cookie_access(cookie, why))
> +	if (!fscache_begin_cookie_access(cookie, why)) {
> +		cres->cache_priv = NULL;
>  		return -ENOBUFS;
> +	}
>  
>  again:
>  	spin_lock(&cookie->lock);
> 
> 

Reviewed-by: Jeff Layton <jlayton@...nel.org>