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From: Juergen Gross <jgross@suse.com>
To: Julien Grall <julien@xen.org>, xen-devel@lists.xenproject.org
Cc: raphning@amazon.co.uk, doebel@amazon.de,
	Julien Grall <jgrall@amazon.com>,
	Ian Jackson <iwj@xenproject.org>, Wei Liu <wl@xen.org>
Subject: Re: [PATCH 09/10] tools/xenstored: Dump delayed requests
Date: Thu, 24 Jun 2021 10:41:26 +0200	[thread overview]
Message-ID: <5b6455f3-9b44-2cf3-e53d-1f235977a4e2@suse.com> (raw)
In-Reply-To: <20210616144324.31652-10-julien@xen.org>


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On 16.06.21 16:43, Julien Grall wrote:
> From: Julien Grall <jgrall@amazon.com>
> 
> Currently, only Live-Update request can be delayed. In a follow-up,
> we will want to delay more requests (e.g. transaction start).
> Therefore we want to preserve delayed requests across Live-Update.
> 
> Delayed requests are just complete "in" buffer. So the code is
> refactored to allow sharing the code to dump "in" buffer.
> 
> Signed-off-by: Julien Grall <jgrall@amazon.com>
> ---
>   tools/xenstore/xenstored_core.c | 42 +++++++++++++++++++++++++--------
>   1 file changed, 32 insertions(+), 10 deletions(-)
> 
> diff --git a/tools/xenstore/xenstored_core.c b/tools/xenstore/xenstored_core.c
> index 5b7ab7f74013..9eca58682b51 100644
> --- a/tools/xenstore/xenstored_core.c
> +++ b/tools/xenstore/xenstored_core.c
> @@ -2403,25 +2403,47 @@ const char *dump_state_global(FILE *fp)
>   	return NULL;
>   }
>   
> +static const char *dump_input_buffered_data(FILE *fp,
> +					    const struct buffered_data *in,
> +					    unsigned int *total_len)
> +{
> +	unsigned int hlen = in->inhdr ? in->used : sizeof(in->hdr);
> +
> +	*total_len += hlen;
> +	if (fp && fwrite(&in->hdr, hlen, 1, fp) != 1)
> +		return "Dump read data error";
> +	if (!in->inhdr && in->used) {
> +		*total_len += in->used;
> +		if (fp && fwrite(in->buffer, in->used, 1, fp) != 1)
> +			return "Dump read data error";
> +	}
> +
> +	return NULL;
> +}
> +
>   /* Called twice: first with fp == NULL to get length, then for writing data. */
>   const char *dump_state_buffered_data(FILE *fp, const struct connection *c,
>   				     struct xs_state_connection *sc)
>   {
>   	unsigned int len = 0, used;
> -	struct buffered_data *out, *in = c->in;
> +	struct buffered_data *out;
>   	bool partial = true;
> +	struct delayed_request *req;
> +	const char *ret;
>   
> -	if (in) {
> -		len = in->inhdr ? in->used : sizeof(in->hdr);
> -		if (fp && fwrite(&in->hdr, len, 1, fp) != 1)
> -			return "Dump read data error";
> -		if (!in->inhdr && in->used) {
> -			len += in->used;
> -			if (fp && fwrite(in->buffer, in->used, 1, fp) != 1)
> -				return "Dump read data error";
> -		}
> +	/* Dump any command that was delayed */
> +	list_for_each_entry(req, &c->delayed, list) {

Please add a comment here that the following if() serves especially to
avoid dumping the data for do_lu_start().

> +		if (req->func != process_delayed_message)
> +			continue;
> +
> +		assert(!req->in->inhdr);
> +		if ((ret = dump_input_buffered_data(fp, req->in, &len)))
> +			return ret;
>   	}
>   
> +	if (c->in && (ret = dump_input_buffered_data(fp, c->in, &len)))
> +		return ret;
> +
>   	if (sc) {
>   		sc->data_in_len = len;
>   		sc->data_resp_len = 0;
> 

Juergen

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  parent reply	other threads:[~2021-06-24  8:41 UTC|newest]

Thread overview: 43+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-16 14:43 [PATCH 00/10] tools/xenstored: Bug fixes + Improve Live-Update Julien Grall
2021-06-16 14:43 ` [PATCH 01/10] MAINTAINERS: Add myself as reviewers for tools/xenstore Julien Grall
2021-06-16 15:15   ` Juergen Gross
2021-06-16 14:43 ` [PATCH 02/10] tools/xenstored: Introduce lu_get_connection() and use it Julien Grall
2021-06-21  8:21   ` Luca Fancellu
2021-06-24  7:21   ` Juergen Gross
2021-06-16 14:43 ` [PATCH 03/10] tools/xenstore: Don't assume conn->in points to the LU request Julien Grall
2021-06-21  8:55   ` Luca Fancellu
2021-06-24  8:06     ` Julien Grall
2021-06-24  7:32   ` Juergen Gross
2021-06-24  7:34     ` Juergen Gross
2021-06-24  7:56       ` Luca Fancellu
2021-06-24  8:05         ` Juergen Gross
2021-06-16 14:43 ` [PATCH 04/10] tools/xenstored: Limit the number of requests a connection can delay Julien Grall
2021-06-21  9:02   ` Luca Fancellu
2021-06-24  7:35   ` Juergen Gross
2021-06-16 14:43 ` [PATCH 05/10] tools/xenstored: xenstored_core.h should include fcntl.h Julien Grall
2021-06-21  9:03   ` Luca Fancellu
2021-06-24  7:36   ` Juergen Gross
2021-06-16 14:43 ` [PATCH 06/10] tools/xenstored: Introduce a wrapper for conn->funcs->can_{read, write} Julien Grall
2021-06-21  9:10   ` Luca Fancellu
2021-06-24  7:39   ` Juergen Gross
2021-06-16 14:43 ` [PATCH 07/10] tools/xenstored: delay_request: don't assume conn->in == in Julien Grall
2021-06-21  9:12   ` Luca Fancellu
2021-06-24  7:44   ` Juergen Gross
2021-06-24  7:58     ` Julien Grall
2021-06-16 14:43 ` [PATCH 08/10] tools/xenstored: Extend restore code to handle multiple input buffer Julien Grall
2021-06-21  9:21   ` Luca Fancellu
2021-06-24  8:30   ` Juergen Gross
2021-06-24  8:42     ` Julien Grall
2021-06-24  9:20       ` Juergen Gross
2021-06-16 14:43 ` [PATCH 09/10] tools/xenstored: Dump delayed requests Julien Grall
2021-06-21  9:27   ` Luca Fancellu
2021-06-24  8:41   ` Juergen Gross [this message]
2021-06-24 10:28     ` Julien Grall
2021-06-24 10:45       ` Juergen Gross
2021-06-24 10:46         ` Julien Grall
2021-06-24 11:02           ` Juergen Gross
2021-06-24 11:17             ` Julien Grall
2021-06-16 14:43 ` [PATCH 10/10] tools/xenstored: Delay new transaction while Live-Update is pending Julien Grall
2021-06-21  9:30   ` Luca Fancellu
2021-06-24  9:23   ` Juergen Gross
2021-06-24 10:43 ` [PATCH 00/10] tools/xenstored: Bug fixes + Improve Live-Update Julien Grall

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