linux-kernel - Re: [PATCH 02/14] staging/lustre/ldlm: fix export reference problem

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Date:   Mon, 7 Nov 2016 01:37:31 +0000 (GMT)
From:   James Simmons <jsimmons@...radead.org>
To:     Oleg Drokin <green@...uxhacker.ru>
cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        devel@...verdev.osuosl.org,
        Andreas Dilger <andreas.dilger@...el.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Lustre Development List <lustre-devel@...ts.lustre.org>,
        Hongchao Zhang <hongchao.zhang@...el.com>
Subject: Re: [PATCH 02/14] staging/lustre/ldlm: fix export reference
 problem


> From: Hongchao Zhang <hongchao.zhang@...el.com>
> 
> 1, in client_import_del_conn, the export returned from
>    class_conn2export is not released after using it.
> 
> 2, in ptlrpc_connect_interpret, the export is not released
>    if the connect_flags isn't compatible.

Reviewed-by: James Simmons <jsimmons@...radead.org>
 
> Signed-off-by: Hongchao Zhang <hongchao.zhang@...el.com>
> Reviewed-on: http://review.whamcloud.com/22031
> Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-8500
> Reviewed-by: James Simmons <uja.ornl@...oo.com>
> Reviewed-by: Bobi Jam <bobijam@...mail.com>
> Signed-off-by: Oleg Drokin <green@...uxhacker.ru>
> ---
>  drivers/staging/lustre/lustre/ldlm/ldlm_lib.c |  3 +++
>  drivers/staging/lustre/lustre/ptlrpc/import.c | 19 ++++++++++---------
>  2 files changed, 13 insertions(+), 9 deletions(-)
> 
> diff --git a/drivers/staging/lustre/lustre/ldlm/ldlm_lib.c b/drivers/staging/lustre/lustre/ldlm/ldlm_lib.c
> index 4f9480e..06d3cc6 100644
> --- a/drivers/staging/lustre/lustre/ldlm/ldlm_lib.c
> +++ b/drivers/staging/lustre/lustre/ldlm/ldlm_lib.c
> @@ -170,6 +170,9 @@ int client_import_del_conn(struct obd_import *imp, struct obd_uuid *uuid)
>  				ptlrpc_connection_put(dlmexp->exp_connection);
>  				dlmexp->exp_connection = NULL;
>  			}
> +
> +			if (dlmexp)
> +				class_export_put(dlmexp);
>  		}
>  
>  		list_del(&imp_conn->oic_item);
> diff --git a/drivers/staging/lustre/lustre/ptlrpc/import.c b/drivers/staging/lustre/lustre/ptlrpc/import.c
> index 46ba5a4..05fd92d 100644
> --- a/drivers/staging/lustre/lustre/ptlrpc/import.c
> +++ b/drivers/staging/lustre/lustre/ptlrpc/import.c
> @@ -972,6 +972,16 @@ static int ptlrpc_connect_interpret(const struct lu_env *env,
>  
>  	spin_unlock(&imp->imp_lock);
>  
> +	if (!exp) {
> +		/* This could happen if export is cleaned during the
> +		 * connect attempt
> +		 */
> +		CERROR("%s: missing export after connect\n",
> +		       imp->imp_obd->obd_name);
> +		rc = -ENODEV;
> +		goto out;
> +	}
> +
>  	/* check that server granted subset of flags we asked for. */
>  	if ((ocd->ocd_connect_flags & imp->imp_connect_flags_orig) !=
>  	    ocd->ocd_connect_flags) {
> @@ -982,15 +992,6 @@ static int ptlrpc_connect_interpret(const struct lu_env *env,
>  		goto out;
>  	}
>  
> -	if (!exp) {
> -		/* This could happen if export is cleaned during the
> -		 * connect attempt
> -		 */
> -		CERROR("%s: missing export after connect\n",
> -		       imp->imp_obd->obd_name);
> -		rc = -ENODEV;
> -		goto out;
> -	}
>  	old_connect_flags = exp_connect_flags(exp);
>  	exp->exp_connect_data = *ocd;
>  	imp->imp_obd->obd_self_export->exp_connect_data = *ocd;
> -- 
> 2.7.4
> 
>