linux-kernel - Re: [PATCH 05/60] staging: lustre: llite: check request != NULL in ll

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Message-ID: <20170130113423.GB6881@mwanda>
Date:   Mon, 30 Jan 2017 14:34:23 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     James Simmons <jsimmons@...radead.org>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        devel@...verdev.osuosl.org,
        Andreas Dilger <andreas.dilger@...el.com>,
        Oleg Drokin <oleg.drokin@...el.com>,
        wang di <di.wang@...el.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Lustre Development List <lustre-devel@...ts.lustre.org>
Subject: Re: [PATCH 05/60] staging: lustre: llite: check request != NULL in
 ll_migrate

On Sat, Jan 28, 2017 at 07:04:33PM -0500, James Simmons wrote:
> From: wang di <di.wang@...el.com>
> 
> Check if the request is NULL, before retrieve reply body
> from the request.
> 
> Signed-off-by: wang di <di.wang@...el.com>
> Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-7396
> Reviewed-on: http://review.whamcloud.com/17079
> Reviewed-by: John L. Hammond <john.hammond@...el.com>
> Reviewed-by: Andreas Dilger <andreas.dilger@...el.com>
> Signed-off-by: James Simmons <jsimmons@...radead.org>
> ---
>  drivers/staging/lustre/lustre/llite/file.c | 41 +++++++++++++++++-------------
>  1 file changed, 23 insertions(+), 18 deletions(-)
> 
> diff --git a/drivers/staging/lustre/lustre/llite/file.c b/drivers/staging/lustre/lustre/llite/file.c
> index a1e51a5..b681e15 100644
> --- a/drivers/staging/lustre/lustre/llite/file.c
> +++ b/drivers/staging/lustre/lustre/llite/file.c
> @@ -2656,28 +2656,33 @@ int ll_migrate(struct inode *parent, struct file *file, int mdtidx,
>  	if (!rc)
>  		ll_update_times(request, parent);
>  

I don't like how we return a non-NULL request on many error paths.  It
would be simpler to understand if mdc_rename() freed request on error.
So mdc_reint() fails but we still continue?  I don't understand that but
there are no comments about it.


> -	body = req_capsule_server_get(&request->rq_pill, &RMF_MDT_BODY);
> -	if (!body) {
> -		rc = -EPROTO;
> -		goto out_free;
> -	}
> +	if (request) {
> +		body = req_capsule_server_get(&request->rq_pill, &RMF_MDT_BODY);
> +		if (!body) {
> +			rc = -EPROTO;
> +			goto out_free;

We should call ptlrpc_req_finished(request) before returning on this
path.

regards,
dan carpenter