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From: Sam Ravnborg <sam@ravnborg.org>
To: Sascha Hauer <s.hauer@pengutronix.de>
Cc: Barebox List <barebox@lists.infradead.org>
Subject: Re: [PATCH 16/42] state: Drop cache bucket
Date: Sat, 15 Apr 2017 10:53:25 +0200	[thread overview]
Message-ID: <20170415085325.GD20400@ravnborg.org> (raw)
In-Reply-To: <20170331070346.26878-17-s.hauer@pengutronix.de>

Hi Sasha.

> diff --git a/common/state/backend_storage.c b/common/state/backend_storage.c
> index 6ec58a0c97..218c67f2d7 100644
> --- a/common/state/backend_storage.c
> +++ b/common/state/backend_storage.c
> @@ -69,22 +69,29 @@ int state_storage_write(struct state_backend_storage *storage,
>  	return -EIO;
>  }
>  
> -/**
> - * state_storage_restore_consistency - Restore consistency on all storage backends
> - * @param storage Storage object
> - * @param buf Buffer with valid data that should be on all buckets after this operation
> - * @param len Length of the buffer
> - * @return 0 on success, -errno otherwise
> - *
> - * This function brings valid data onto all buckets we have to ensure that all
> - * data copies are in sync. In the current implementation we just write the data
> - * to all buckets. Bucket implementations that need to keep the number of writes
> - * low, can read their own copy first and compare it.
> - */
> -int state_storage_restore_consistency(struct state_backend_storage *storage,
> -				      const void * buf, ssize_t len)
> +static int bucket_refresh(struct state_backend_storage *storage,
> +			  struct state_backend_storage_bucket *bucket, void *buf, ssize_t len)
>  {
> -	return state_storage_write(storage, buf, len);
> +	int ret;
> +
> +	if (bucket->needs_refresh)
> +		goto refresh;
> +
> +	if (bucket->len != len)
> +		goto refresh;
> +
> +	if (memcmp(bucket->buf, buf, len))
> +		goto refresh;
> +
> +	return 0;
> +
> +refresh:
> +	ret = bucket->write(bucket, buf, len);

In the code above we check needs_refresh and len.
But needs_refresh is never set back to 0 so it looks like we will refresh it too often.
The same with the len argument.

> +	/*
> +	 * Iterate over all buckets. The first valid one we find is the
> +	 * one we want to use.
> +	 */
>  	list_for_each_entry(bucket, &storage->buckets, bucket_list) {
> -		ret = bucket->read(bucket, buf, len);
> -		if (ret) {
> +		ret = bucket->read(bucket, &bucket->buf, &bucket->len);
> +		if (ret == -EUCLEAN) {
> +			bucket->needs_refresh = 1;
> +		} else if (ret) {
This is where we mark it as need_refresh.

	Sam

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  reply	other threads:[~2017-04-15  8:53 UTC|newest]

Thread overview: 52+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-03-31  7:03 State patches Sascha Hauer
2017-03-31  7:03 ` [PATCH 01/42] state: Make pointing to the backend using a phandle the only supported method Sascha Hauer
2017-05-15  9:18   ` Jan Remmet
2017-05-15 10:14     ` Jan Remmet
2017-05-16  5:33       ` Sascha Hauer
2017-05-17  9:13         ` Jan Remmet
2017-03-31  7:03 ` [PATCH 02/42] state: Use positive logic Sascha Hauer
2017-03-31  7:03 ` [PATCH 03/42] state: backend: remove .get_packed_len Sascha Hauer
2017-03-31  7:03 ` [PATCH 04/42] state: backend: remove len_hint argument from state_storage_read Sascha Hauer
2017-03-31  7:03 ` [PATCH 05/42] state: Drop backend as extra struct type Sascha Hauer
2017-03-31  7:03 ` [PATCH 06/42] state: merge backend.c into state.c Sascha Hauer
2017-03-31  7:03 ` [PATCH 07/42] state: open code state_backend_init in caller Sascha Hauer
2017-03-31  7:03 ` [PATCH 08/42] state: remove unnecessary argument from state_format_init Sascha Hauer
2017-03-31  7:03 ` [PATCH 09/42] state: pass struct state * to storage functions Sascha Hauer
2017-03-31  7:03 ` [PATCH 10/42] state: storage: initialize variable once outside loop Sascha Hauer
2017-03-31  7:03 ` [PATCH 11/42] state: backend_circular: Read whole PEB Sascha Hauer
2017-04-15  8:40   ` Sam Ravnborg
2017-03-31  7:03 ` [PATCH 12/42] state: drop lazy_init Sascha Hauer
2017-03-31  7:03 ` [PATCH 13/42] state: simplify direct backend Sascha Hauer
2017-03-31  7:03 ` [PATCH 14/42] state: replace len_hint logic Sascha Hauer
2017-03-31  7:03 ` [PATCH 15/42] state: Convert all bufs to void * Sascha Hauer
2017-03-31  7:03 ` [PATCH 16/42] state: Drop cache bucket Sascha Hauer
2017-04-15  8:53   ` Sam Ravnborg [this message]
2017-04-19  8:22     ` Sascha Hauer
2017-03-31  7:03 ` [PATCH 17/42] state: backend-direct: Fix max_size Sascha Hauer
2017-03-31  7:03 ` [PATCH 18/42] state: bucket: Make output more informative Sascha Hauer
2017-03-31  7:03 ` [PATCH 19/42] state: backend_bucket_direct: max_size is always given Sascha Hauer
2017-03-31  7:03 ` [PATCH 20/42] state: backend: Add more fields to struct state_backend_storage Sascha Hauer
2017-03-31  7:03 ` [PATCH 21/42] state: backend_circular: remove unnecessary warning Sascha Hauer
2017-03-31  7:03 ` [PATCH 22/42] state: storage: direct: do not close file that is not opened Sascha Hauer
2017-03-31  7:03 ` [PATCH 23/42] state: backend: Add some documentation Sascha Hauer
2017-03-31  7:03 ` [PATCH 24/42] state: backend_circular: default to circular storage Sascha Hauer
2017-03-31  7:03 ` [PATCH 25/42] state: backend_circular: rewrite function doc Sascha Hauer
2017-03-31  7:03 ` [PATCH 26/42] state: backend_storage: Rename variable nr_copies to n_buckets Sascha Hauer
2017-03-31  7:03 ` [PATCH 27/42] state: backend_storage: Rename variable desired_copies to desired_buckets Sascha Hauer
2017-03-31  7:03 ` [PATCH 28/42] state: backend_storage: rewrite function doc Sascha Hauer
2017-03-31  7:03 ` [PATCH 29/42] state: backend_storage: make locally used variable static Sascha Hauer
2017-03-31  7:03 ` [PATCH 30/42] state: backend_storage: rename more variables Sascha Hauer
2017-03-31  7:03 ` [PATCH 31/42] keystore: implement forgetting secrets Sascha Hauer
2017-03-31  7:03 ` [PATCH 32/42] commands: implement keystore command Sascha Hauer
2017-03-31  7:03 ` [PATCH 33/42] commands: state: allow loading state with -l Sascha Hauer
2017-03-31  7:03 ` [PATCH 34/42] crypto: digest: initialize earlier Sascha Hauer
2017-03-31  7:03 ` [PATCH 35/42] state: backend_raw: alloc digest only when needed Sascha Hauer
2017-03-31  7:03 ` [PATCH 36/42] state: backend_circular: Set minumum writesize to 8 Sascha Hauer
2017-03-31  7:03 ` [PATCH 37/42] state: backend bucket circular: Explain metadata Sascha Hauer
2017-03-31  7:03 ` [PATCH 38/42] state: Allow to load without authentification Sascha Hauer
2017-03-31  7:03 ` [PATCH 39/42] state: Update documentation Sascha Hauer
2017-03-31  7:03 ` [PATCH 40/42] state: Do not load state during state_new_from_node Sascha Hauer
2017-03-31  7:03 ` [PATCH 41/42] state: Remove -EUCLEAN check from userspace tool Sascha Hauer
2017-03-31  7:03 ` [PATCH 42/42] state: find device node from device path, not from device node path Sascha Hauer
2017-04-03 20:15 ` State patches Sam Ravnborg
2017-04-04  6:19   ` Sascha Hauer

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