From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from metis.ext.pengutronix.de ([2001:67c:670:201:290:27ff:fe1d:cc33]) by casper.infradead.org with esmtps (Exim 4.87 #1 (Red Hat Linux)) id 1ctqbc-0001eg-51 for barebox@lists.infradead.org; Fri, 31 Mar 2017 07:04:21 +0000 From: Sascha Hauer Date: Fri, 31 Mar 2017 09:03:41 +0200 Message-Id: <20170331070346.26878-38-s.hauer@pengutronix.de> In-Reply-To: <20170331070346.26878-1-s.hauer@pengutronix.de> References: <20170331070346.26878-1-s.hauer@pengutronix.de> List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "barebox" Errors-To: barebox-bounces+u.kleine-koenig=pengutronix.de@lists.infradead.org Subject: [PATCH 37/42] state: backend bucket circular: Explain metadata To: Barebox List Explain why we have metadata and where it is used. Signed-off-by: Sascha Hauer --- common/state/backend_bucket_circular.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/common/state/backend_bucket_circular.c b/common/state/backend_bucket_circular.c index 5a525f68e1..d99ba39126 100644 --- a/common/state/backend_bucket_circular.c +++ b/common/state/backend_bucket_circular.c @@ -61,6 +61,11 @@ struct state_backend_storage_bucket_circular { struct device_d *dev; }; +/* + * The metadata will be written directly before writesize aligned offsets. + * When searching backwards through the pages it allows us to find the + * beginning of the data. + */ struct __attribute__((__packed__)) state_backend_storage_bucket_circular_meta { uint32_t magic; uint32_t written_length; -- 2.11.0 _______________________________________________ barebox mailing list barebox@lists.infradead.org http://lists.infradead.org/mailman/listinfo/barebox