[PATCH] mtd: Add sysfs attribute for mtd OOB available size

[Boris Brezillon]

On Mon, 2 Apr 2018 16:20:10 +0800
Xiaolei Li <xiaolei.li at mediatek.com> wrote:

> Expose mtd OOB available size by sysfs file. Then users can get available
> OOB size by accessing /sys/class/mtd/mtdX/oobavail.
> 
> Signed-off-by: Xiaolei Li <xiaolei.li at mediatek.com>

Applied.

Thanks,

Boris

> ---
>  Documentation/ABI/testing/sysfs-class-mtd |  8 ++++++++
>  drivers/mtd/mtdcore.c                     | 10 ++++++++++
>  2 files changed, 18 insertions(+)
> 
> diff --git a/Documentation/ABI/testing/sysfs-class-mtd b/Documentation/ABI/testing/sysfs-class-mtd
> index f34e5923..3bc7c0a 100644
> --- a/Documentation/ABI/testing/sysfs-class-mtd
> +++ b/Documentation/ABI/testing/sysfs-class-mtd
> @@ -232,3 +232,11 @@ Description:
>  		of the parent (another partition or a flash device) in bytes.
>  		This attribute is absent on flash devices, so it can be used
>  		to distinguish them from partitions.
> +
> +What:		/sys/class/mtd/mtdX/oobavail
> +Date:		April 2018
> +KernelVersion:	4.16
> +Contact:	linux-mtd at lists.infradead.org
> +Description:
> +		Number of bytes available for a client to place data into
> +		the out of band area.
> diff --git a/drivers/mtd/mtdcore.c b/drivers/mtd/mtdcore.c
> index 807d17d..99d9352 100644
> --- a/drivers/mtd/mtdcore.c
> +++ b/drivers/mtd/mtdcore.c
> @@ -210,6 +210,15 @@ static ssize_t mtd_oobsize_show(struct device *dev,
>  }
>  static DEVICE_ATTR(oobsize, S_IRUGO, mtd_oobsize_show, NULL);
>  
> +static ssize_t mtd_oobavail_show(struct device *dev,
> +				 struct device_attribute *attr, char *buf)
> +{
> +	struct mtd_info *mtd = dev_get_drvdata(dev);
> +
> +	return snprintf(buf, PAGE_SIZE, "%lu\n", (unsigned long)mtd->oobavail);
> +}
> +static DEVICE_ATTR(oobavail, S_IRUGO, mtd_oobavail_show, NULL);
> +
>  static ssize_t mtd_numeraseregions_show(struct device *dev,
>  		struct device_attribute *attr, char *buf)
>  {
> @@ -327,6 +336,7 @@ static ssize_t mtd_bbtblocks_show(struct device *dev,
>  	&dev_attr_writesize.attr,
>  	&dev_attr_subpagesize.attr,
>  	&dev_attr_oobsize.attr,
> +	&dev_attr_oobavail.attr,
>  	&dev_attr_numeraseregions.attr,
>  	&dev_attr_name.attr,
>  	&dev_attr_ecc_strength.attr,