linux-kernel - Re: [Ocfs2-devel] [PATCH] ocfs2: get rid of ocfs2_is_o2cb

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Date:   Thu, 22 Jun 2017 09:23:00 +0800
From:   Eric Ren <zren@...e.com>
To:     Gang He <ghe@...e.com>, mfasheh@...sity.com, jlbec@...lplan.org
Cc:     linux-kernel@...r.kernel.org, ocfs2-devel@....oracle.com
Subject: Re: [Ocfs2-devel] [PATCH] ocfs2: get rid of ocfs2_is_o2cb_active
 function

On 05/22/17 16:17, Gang He wrote:
> This patch is used to get rid of ocfs2_is_o2cb_active() function,
> Why? First, we had the similar functions to identify which cluster
> stack is being used via osb->osb_cluster_stack. Second, the current
> implementation of ocfs2_is_o2cb_active() function is not total safe,
> base on the design of stackglue, we need to get ocfs2_stack_lock lock
> before using ocfs2_stack related data structures, and that
> active_stack pointer can be NULL in case mount failure.
>
> Signed-off-by: Gang He <ghe@...e.com>
Looks good.
Reviewed-by: Eric Ren <zren@...e.com>

Eric

> ---
>   fs/ocfs2/dlmglue.c   | 2 +-
>   fs/ocfs2/stackglue.c | 6 ------
>   fs/ocfs2/stackglue.h | 3 ---
>   3 files changed, 1 insertion(+), 10 deletions(-)
>
> diff --git a/fs/ocfs2/dlmglue.c b/fs/ocfs2/dlmglue.c
> index 3b7c937..a54196a 100644
> --- a/fs/ocfs2/dlmglue.c
> +++ b/fs/ocfs2/dlmglue.c
> @@ -3409,7 +3409,7 @@ static int ocfs2_downconvert_lock(struct ocfs2_super *osb,
>   	 * we can recover correctly from node failure. Otherwise, we may get
>   	 * invalid LVB in LKB, but without DLM_SBF_VALNOTVALID being set.
>   	 */
> -	if (!ocfs2_is_o2cb_active() &&
> +	if (ocfs2_userspace_stack(osb) &&
>   	    lockres->l_ops->flags & LOCK_TYPE_USES_LVB)
>   		lvb = 1;
>   
> diff --git a/fs/ocfs2/stackglue.c b/fs/ocfs2/stackglue.c
> index 8203590..52c07346b 100644
> --- a/fs/ocfs2/stackglue.c
> +++ b/fs/ocfs2/stackglue.c
> @@ -48,12 +48,6 @@
>    */
>   static struct ocfs2_stack_plugin *active_stack;
>   
> -inline int ocfs2_is_o2cb_active(void)
> -{
> -	return !strcmp(active_stack->sp_name, OCFS2_STACK_PLUGIN_O2CB);
> -}
> -EXPORT_SYMBOL_GPL(ocfs2_is_o2cb_active);
> -
>   static struct ocfs2_stack_plugin *ocfs2_stack_lookup(const char *name)
>   {
>   	struct ocfs2_stack_plugin *p;
> diff --git a/fs/ocfs2/stackglue.h b/fs/ocfs2/stackglue.h
> index e3036e1..f2dce10 100644
> --- a/fs/ocfs2/stackglue.h
> +++ b/fs/ocfs2/stackglue.h
> @@ -298,9 +298,6 @@ int ocfs2_plock(struct ocfs2_cluster_connection *conn, u64 ino,
>   int ocfs2_stack_glue_register(struct ocfs2_stack_plugin *plugin);
>   void ocfs2_stack_glue_unregister(struct ocfs2_stack_plugin *plugin);
>   
> -/* In ocfs2_downconvert_lock(), we need to know which stack we are using */
> -int ocfs2_is_o2cb_active(void);
> -
>   extern struct kset *ocfs2_kset;
>   
>   #endif  /* STACKGLUE_H */