[U-Boot] [PATCH v2 4/6] dfu: mmc: remove file size limit for io operations

[Lukasz Majewski <lukma@denx.de>]

Hi Marek,

> Add support for operations on files larger than
> CONFIG_SYS_DFU_MAX_FILE_SIZE. The buffered io mechanism is still used
> for aggregating io requests, so for files up to
> CONFIG_SYS_DFU_MAX_FILE_SIZE nothing is changed and they will be
> handled in a single filesystem call.
> 

Acked-by: Lukasz Majewski <lukma@denx.de>

> Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
> ---
>  drivers/dfu/dfu_mmc.c | 46
> ++++++++++++++++++++++++++++--------------- 1 file changed, 30
> insertions(+), 16 deletions(-)
> 
> diff --git a/drivers/dfu/dfu_mmc.c b/drivers/dfu/dfu_mmc.c
> index 2d97f4528c..b3174571ae 100644
> --- a/drivers/dfu/dfu_mmc.c
> +++ b/drivers/dfu/dfu_mmc.c
> @@ -17,7 +17,7 @@
>  
>  static unsigned char *dfu_file_buf;
>  static u64 dfu_file_buf_len;
> -static long dfu_file_buf_filled;
> +static u64 dfu_file_buf_offset;
>  
>  static int mmc_block_op(enum dfu_op op, struct dfu_entity *dfu,
>  			u64 offset, void *buf, long *len)
> @@ -123,7 +123,7 @@ static int mmc_file_op(enum dfu_op op, struct
> dfu_entity *dfu, 
>  	switch (op) {
>  	case DFU_OP_READ:
> -		ret = fs_read(dfu->name, (size_t)buf, offset, 0,
> &size);
> +		ret = fs_read(dfu->name, (size_t)buf, offset, *len,
> &size); if (ret) {
>  			puts("dfu: fs_read error!\n");
>  			return ret;
> @@ -154,25 +154,38 @@ static int mmc_file_op(enum dfu_op op, struct
> dfu_entity *dfu, 
>  static int mmc_file_buf_write(struct dfu_entity *dfu, u64 offset,
> void *buf, long *len) {
> -	if (dfu_file_buf_len + *len > CONFIG_SYS_DFU_MAX_FILE_SIZE) {
> +	int ret = 0;
> +
> +	if (offset == 0) {
>  		dfu_file_buf_len = 0;
> -		return -EINVAL;
> +		dfu_file_buf_offset = 0;
>  	}
>  
>  	/* Add to the current buffer. */
> +	if (dfu_file_buf_len + *len > CONFIG_SYS_DFU_MAX_FILE_SIZE)
> +		*len = CONFIG_SYS_DFU_MAX_FILE_SIZE -
> dfu_file_buf_len; memcpy(dfu_file_buf + dfu_file_buf_len, buf, *len);
>  	dfu_file_buf_len += *len;
>  
> -	return 0;
> +	if (dfu_file_buf_len == CONFIG_SYS_DFU_MAX_FILE_SIZE) {
> +		ret = mmc_file_op(DFU_OP_WRITE, dfu,
> dfu_file_buf_offset,
> +				  dfu_file_buf, &dfu_file_buf_len);
> +		dfu_file_buf_offset += dfu_file_buf_len;
> +		dfu_file_buf_len = 0;
> +	}
> +
> +	return ret;
>  }
>  
>  static int mmc_file_buf_write_finish(struct dfu_entity *dfu)
>  {
> -	int ret = mmc_file_op(DFU_OP_WRITE, dfu, 0, dfu_file_buf,
> -			&dfu_file_buf_len);
> +	int ret = mmc_file_op(DFU_OP_WRITE, dfu, dfu_file_buf_offset,
> +			dfu_file_buf, &dfu_file_buf_len);
>  
>  	/* Now that we're done */
>  	dfu_file_buf_len = 0;
> +	dfu_file_buf_offset = 0;
> +
>  	return ret;
>  }
>  
> @@ -219,12 +232,9 @@ int dfu_get_medium_size_mmc(struct dfu_entity
> *dfu, u64 *size) return 0;
>  	case DFU_FS_FAT:
>  	case DFU_FS_EXT4:
> -		dfu_file_buf_filled = -1;
>  		ret = mmc_file_op(DFU_OP_SIZE, dfu, 0, NULL, size);
>  		if (ret < 0)
>  			return ret;
> -		if (*size > CONFIG_SYS_DFU_MAX_FILE_SIZE)
> -			return -1;
>  		return 0;
>  	default:
>  		printf("%s: Layout (%s) not (yet) supported!\n",
> __func__, @@ -238,19 +248,23 @@ static int mmc_file_buf_read(struct
> dfu_entity *dfu, u64 offset, void *buf, long *len)
>  {
>  	int ret;
> -	u64 file_len;
>  
> -	if (dfu_file_buf_filled == -1) {
> -		ret = mmc_file_op(DFU_OP_READ, dfu, 0, dfu_file_buf,
> &file_len);
> +	if (offset == 0 || offset >= dfu_file_buf_offset +
> dfu_file_buf_len ||
> +	    offset + *len < dfu_file_buf_offset) {
> +		u64 file_len = CONFIG_SYS_DFU_MAX_FILE_SIZE;
> +
> +		ret = mmc_file_op(DFU_OP_READ, dfu, offset,
> dfu_file_buf,
> +				  &file_len);
>  		if (ret < 0)
>  			return ret;
> -		dfu_file_buf_filled = file_len;
> +		dfu_file_buf_len = file_len;
> +		dfu_file_buf_offset = offset;
>  	}
> -	if (offset + *len > dfu_file_buf_filled)
> +	if (offset + *len > dfu_file_buf_offset + dfu_file_buf_len)
>  		return -EINVAL;
>  
>  	/* Add to the current buffer. */
> -	memcpy(buf, dfu_file_buf + offset, *len);
> +	memcpy(buf, dfu_file_buf + offset - dfu_file_buf_offset,
> *len); 
>  	return 0;
>  }




Best regards,

Lukasz Majewski

--

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HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-59 Fax: (+49)-8142-66989-80 Email: lukma at denx.de
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