Re: [PATCH 1/5] 9p/net: move code in preparation of async rpc

[Christian Schoenebeck <linux_oss@crudebyte.com>]

On Saturday, February 11, 2023 8:50:19 AM CET Dominique Martinet wrote:
> This commit containers no code change:
>  - move p9_fid_* higher in code as p9_fid_destroy will be used
> in async callback

I would have just added p9_fid_destroy()'s prototype earlier in code instead
of moving stuff around:

static void p9_fid_destroy(struct p9_fid *fid);

Because that would not mess with 'git blame' history. But anyway, it's just
restructuring, no behaviour change, so:

Reviewed-by: Christian Schoenebeck <linux_oss@crudebyte.com>

>  - move p9_client_flush as it will no longer call p9_client_rpc
> and can simplify forward declaration a bit later
> 
> This just simplifies the next commits to make diffs cleaner.
> 
> Signed-off-by: Dominique Martinet <asmadeus@codewreck.org>
> ---
>  net/9p/client.c | 198 ++++++++++++++++++++++++------------------------
>  1 file changed, 99 insertions(+), 99 deletions(-)
> 
> diff --git a/net/9p/client.c b/net/9p/client.c
> index 622ec6a586ee..53ebd07c36ee 100644
> --- a/net/9p/client.c
> +++ b/net/9p/client.c
> @@ -428,6 +428,66 @@ static void p9_tag_cleanup(struct p9_client *c)
>  	rcu_read_unlock();
>  }
>  
> +static struct p9_fid *p9_fid_create(struct p9_client *clnt)
> +{
> +	int ret;
> +	struct p9_fid *fid;
> +
> +	p9_debug(P9_DEBUG_FID, "clnt %p\n", clnt);
> +	fid = kzalloc(sizeof(*fid), GFP_KERNEL);
> +	if (!fid)
> +		return NULL;
> +
> +	fid->mode = -1;
> +	fid->uid = current_fsuid();
> +	fid->clnt = clnt;
> +	refcount_set(&fid->count, 1);
> +
> +	idr_preload(GFP_KERNEL);
> +	spin_lock_irq(&clnt->lock);
> +	ret = idr_alloc_u32(&clnt->fids, fid, &fid->fid, P9_NOFID - 1,
> +			    GFP_NOWAIT);
> +	spin_unlock_irq(&clnt->lock);
> +	idr_preload_end();
> +	if (!ret) {
> +		trace_9p_fid_ref(fid, P9_FID_REF_CREATE);
> +		return fid;
> +	}
> +
> +	kfree(fid);
> +	return NULL;
> +}
> +
> +static void p9_fid_destroy(struct p9_fid *fid)
> +{
> +	struct p9_client *clnt;
> +	unsigned long flags;
> +
> +	p9_debug(P9_DEBUG_FID, "fid %d\n", fid->fid);
> +	trace_9p_fid_ref(fid, P9_FID_REF_DESTROY);
> +	clnt = fid->clnt;
> +	spin_lock_irqsave(&clnt->lock, flags);
> +	idr_remove(&clnt->fids, fid->fid);
> +	spin_unlock_irqrestore(&clnt->lock, flags);
> +	kfree(fid->rdir);
> +	kfree(fid);
> +}
> +
> +/* We also need to export tracepoint symbols for tracepoint_enabled() */
> +EXPORT_TRACEPOINT_SYMBOL(9p_fid_ref);
> +
> +void do_trace_9p_fid_get(struct p9_fid *fid)
> +{
> +	trace_9p_fid_ref(fid, P9_FID_REF_GET);
> +}
> +EXPORT_SYMBOL(do_trace_9p_fid_get);
> +
> +void do_trace_9p_fid_put(struct p9_fid *fid)
> +{
> +	trace_9p_fid_ref(fid, P9_FID_REF_PUT);
> +}
> +EXPORT_SYMBOL(do_trace_9p_fid_put);
> +
>  /**
>   * p9_client_cb - call back from transport to client
>   * @c: client state
> @@ -570,6 +630,45 @@ static int p9_check_errors(struct p9_client *c, struct p9_req_t *req)
>  	return err;
>  }
>  
> +static struct p9_req_t *p9_client_prepare_req(struct p9_client *c,
> +					      int8_t type, uint t_size, uint r_size,
> +					      const char *fmt, va_list ap)
> +{
> +	int err;
> +	struct p9_req_t *req;
> +	va_list apc;
> +
> +	p9_debug(P9_DEBUG_MUX, "client %p op %d\n", c, type);
> +
> +	/* we allow for any status other than disconnected */
> +	if (c->status == Disconnected)
> +		return ERR_PTR(-EIO);
> +
> +	/* if status is begin_disconnected we allow only clunk request */
> +	if (c->status == BeginDisconnect && type != P9_TCLUNK)
> +		return ERR_PTR(-EIO);
> +
> +	va_copy(apc, ap);
> +	req = p9_tag_alloc(c, type, t_size, r_size, fmt, apc);
> +	va_end(apc);
> +	if (IS_ERR(req))
> +		return req;
> +
> +	/* marshall the data */
> +	p9pdu_prepare(&req->tc, req->tc.tag, type);
> +	err = p9pdu_vwritef(&req->tc, c->proto_version, fmt, ap);
> +	if (err)
> +		goto reterr;
> +	p9pdu_finalize(c, &req->tc);
> +	trace_9p_client_req(c, type, req->tc.tag);
> +	return req;
> +reterr:
> +	p9_req_put(c, req);
> +	/* We have to put also the 2nd reference as it won't be used */
> +	p9_req_put(c, req);
> +	return ERR_PTR(err);
> +}
> +
>  static struct p9_req_t *
>  p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...);
>  
> @@ -613,45 +712,6 @@ static int p9_client_flush(struct p9_client *c, struct p9_req_t *oldreq)
>  	return 0;
>  }
>  
> -static struct p9_req_t *p9_client_prepare_req(struct p9_client *c,
> -					      int8_t type, uint t_size, uint r_size,
> -					      const char *fmt, va_list ap)
> -{
> -	int err;
> -	struct p9_req_t *req;
> -	va_list apc;
> -
> -	p9_debug(P9_DEBUG_MUX, "client %p op %d\n", c, type);
> -
> -	/* we allow for any status other than disconnected */
> -	if (c->status == Disconnected)
> -		return ERR_PTR(-EIO);
> -
> -	/* if status is begin_disconnected we allow only clunk request */
> -	if (c->status == BeginDisconnect && type != P9_TCLUNK)
> -		return ERR_PTR(-EIO);
> -
> -	va_copy(apc, ap);
> -	req = p9_tag_alloc(c, type, t_size, r_size, fmt, apc);
> -	va_end(apc);
> -	if (IS_ERR(req))
> -		return req;
> -
> -	/* marshall the data */
> -	p9pdu_prepare(&req->tc, req->tc.tag, type);
> -	err = p9pdu_vwritef(&req->tc, c->proto_version, fmt, ap);
> -	if (err)
> -		goto reterr;
> -	p9pdu_finalize(c, &req->tc);
> -	trace_9p_client_req(c, type, req->tc.tag);
> -	return req;
> -reterr:
> -	p9_req_put(c, req);
> -	/* We have to put also the 2nd reference as it won't be used */
> -	p9_req_put(c, req);
> -	return ERR_PTR(err);
> -}
> -
>  /**
>   * p9_client_rpc - issue a request and wait for a response
>   * @c: client session
> @@ -838,66 +898,6 @@ static struct p9_req_t *p9_client_zc_rpc(struct p9_client *c, int8_t type,
>  	return ERR_PTR(safe_errno(err));
>  }
>  
> -static struct p9_fid *p9_fid_create(struct p9_client *clnt)
> -{
> -	int ret;
> -	struct p9_fid *fid;
> -
> -	p9_debug(P9_DEBUG_FID, "clnt %p\n", clnt);
> -	fid = kzalloc(sizeof(*fid), GFP_KERNEL);
> -	if (!fid)
> -		return NULL;
> -
> -	fid->mode = -1;
> -	fid->uid = current_fsuid();
> -	fid->clnt = clnt;
> -	refcount_set(&fid->count, 1);
> -
> -	idr_preload(GFP_KERNEL);
> -	spin_lock_irq(&clnt->lock);
> -	ret = idr_alloc_u32(&clnt->fids, fid, &fid->fid, P9_NOFID - 1,
> -			    GFP_NOWAIT);
> -	spin_unlock_irq(&clnt->lock);
> -	idr_preload_end();
> -	if (!ret) {
> -		trace_9p_fid_ref(fid, P9_FID_REF_CREATE);
> -		return fid;
> -	}
> -
> -	kfree(fid);
> -	return NULL;
> -}
> -
> -static void p9_fid_destroy(struct p9_fid *fid)
> -{
> -	struct p9_client *clnt;
> -	unsigned long flags;
> -
> -	p9_debug(P9_DEBUG_FID, "fid %d\n", fid->fid);
> -	trace_9p_fid_ref(fid, P9_FID_REF_DESTROY);
> -	clnt = fid->clnt;
> -	spin_lock_irqsave(&clnt->lock, flags);
> -	idr_remove(&clnt->fids, fid->fid);
> -	spin_unlock_irqrestore(&clnt->lock, flags);
> -	kfree(fid->rdir);
> -	kfree(fid);
> -}
> -
> -/* We also need to export tracepoint symbols for tracepoint_enabled() */
> -EXPORT_TRACEPOINT_SYMBOL(9p_fid_ref);
> -
> -void do_trace_9p_fid_get(struct p9_fid *fid)
> -{
> -	trace_9p_fid_ref(fid, P9_FID_REF_GET);
> -}
> -EXPORT_SYMBOL(do_trace_9p_fid_get);
> -
> -void do_trace_9p_fid_put(struct p9_fid *fid)
> -{
> -	trace_9p_fid_ref(fid, P9_FID_REF_PUT);
> -}
> -EXPORT_SYMBOL(do_trace_9p_fid_put);
> -
>  static int p9_client_version(struct p9_client *c)
>  {
>  	int err = 0;
>