[PATCH] state: backend_bucket_direct: add debug prints on read/write

[Ahmad Fatoum]

On 28.07.23 15:31, Ahmad Fatoum wrote:
> We already have debug prints for the circular backend to help see how
> much data is read/written for each bucket. Add similar debugging info
> for the direct backend as well. Example with stride size of 2048 and
> 44 bytes for the variable set:
> 
>   barebox at board:/ state -l
>   state: Read state from 0 length 68
>   state: Read state from 2048 length 68
>   state: Read state from 4096 length 68
> 
>   barebox at board:/ state -s
>   state: Written state to offset 0 length 68 data length 60
>   state: Written state to offset 2048 length 68 data length 60
>   state: Written state to offset 4096 length 68 data length 60
> 
> Signed-off-by: Ahmad Fatoum <a.fatoum at pengutronix.de>
> ---
>  common/state/backend_bucket_direct.c | 14 +++++++++++++-
>  1 file changed, 13 insertions(+), 1 deletion(-)
> 
> diff --git a/common/state/backend_bucket_direct.c b/common/state/backend_bucket_direct.c
> index f06e14277862..03c752d6fe41 100644
> --- a/common/state/backend_bucket_direct.c
> +++ b/common/state/backend_bucket_direct.c
> @@ -52,7 +52,7 @@ static int state_backend_bucket_direct_read(struct state_backend_storage_bucket
>  	struct state_backend_storage_bucket_direct *direct =
>  	    get_bucket_direct(bucket);
>  	struct state_backend_storage_bucket_direct_meta meta;
> -	uint32_t read_len;
> +	uint32_t read_len, header_len = 0;
>  	void *buf;
>  	int ret;
>  
> @@ -72,6 +72,8 @@ static int state_backend_bucket_direct_read(struct state_backend_storage_bucket
>  			return -EINVAL;
>  
>  		}
> +
> +		header_len = sizeof(meta);
>  	} else {
>  		if (meta.magic != ~0 && !!meta.magic)
>  			bucket->wrong_magic = 1;
> @@ -87,12 +89,16 @@ static int state_backend_bucket_direct_read(struct state_backend_storage_bucket
>  				-errno);
>  			return -errno;
>  		}
> +

Oops. Stray new line.

>  	}
>  
>  	buf = xmalloc(read_len);
>  	if (!buf)
>  		return -ENOMEM;
>  
> +	dev_dbg(direct->dev, "Read state from %lld length %d\n", (long long) direct->offset,
> +		header_len + read_len);
> +
>  	ret = read_full(direct->fd, buf, read_len);
>  	if (ret < 0) {
>  		dev_err(direct->dev, "Failed to read from file, %d\n", ret);
> @@ -112,6 +118,7 @@ static int state_backend_bucket_direct_write(struct state_backend_storage_bucket
>  {
>  	struct state_backend_storage_bucket_direct *direct =
>  	    get_bucket_direct(bucket);
> +	size_t header_len = 0;
>  	int ret;
>  	struct state_backend_storage_bucket_direct_meta meta;
>  
> @@ -129,6 +136,8 @@ static int state_backend_bucket_direct_write(struct state_backend_storage_bucket
>  			dev_err(direct->dev, "Failed to write metadata to file, %d\n", ret);
>  			return ret;
>  		}
> +
> +		header_len = sizeof(meta);
>  	} else {
>  		if (!IS_ENABLED(CONFIG_STATE_BACKWARD_COMPATIBLE)) {
>  			dev_dbg(direct->dev, "Too small stride size: must skip metadata! Increase stride size\n");
> @@ -148,6 +157,9 @@ static int state_backend_bucket_direct_write(struct state_backend_storage_bucket
>  		return ret;
>  	}
>  
> +	dev_dbg(direct->dev, "Written state to offset %lld length %zu data length %zu\n",
> +		(long long)direct->offset, len + header_len, len);
> +
>  	return 0;
>  }
>  

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