[PATCH 1/2] ubi: Expose interface for detailed erase counters

[Zhihao Cheng]

在 2024/11/25 21:48, Rickard Andersson 写道:
> Using the ioctl command 'UBI_IOCECNFO' user space can obtain
> detailed erase counter information of all blocks of a device.
> 
> Signed-off-by: Rickard Andersson <rickard.andersson at axis.com>
> ---
>   include/uapi/mtd/ubi-user.h | 25 +++++++++++++++++++++++++
>   1 file changed, 25 insertions(+)
> 
> diff --git a/include/uapi/mtd/ubi-user.h b/include/uapi/mtd/ubi-user.h
> index e1571603175e..667680e44ed4 100644
> --- a/include/uapi/mtd/ubi-user.h
> +++ b/include/uapi/mtd/ubi-user.h
> @@ -175,6 +175,8 @@
>   #define UBI_IOCRPEB _IOW(UBI_IOC_MAGIC, 4, __s32)
>   /* Force scrubbing on the specified PEB */
>   #define UBI_IOCSPEB _IOW(UBI_IOC_MAGIC, 5, __s32)
> +/* Read detailed device erase counter information */
> +#define UBI_IOCECNFO _IOWR(UBI_IOC_MAGIC, 6, struct ubi_ecinfo_req)
>   
>   /* ioctl commands of the UBI control character device */
>   
> @@ -470,4 +472,27 @@ struct ubi_blkcreate_req {
>   	__s8  padding[128];
>   }  __packed;
>   
> +/**
> + * struct ubi_ecinfo_req - a data structure used in UBI device erase count
> + * information requests and responses.
> + *
> + * @start_ec_req: first erase counter block in range to read
> + * @end_ec_req: last erase counter block in the half-open range
> + * @end_ec_res: last erase counter block that was actually read
> + * @erase_counters: array of erase counter values
> + * @padding: reserved for future, not used, has to be zeroed
> + *
> + * Erase counters are read in range @start_ec_req to @end_ec_req. Range is half-open
> + * i.e erase counter of end_ec_req is not actually included.
> + * The read erase counters are placed in @erase_counters. If a block is bad or if the
> + * erase counter is unknown the value of the block will be set to -1.
> + */
> +struct ubi_ecinfo_req {
> +	__s32 start_ec_req;
> +	__s32 end_ec_req;
> +	__s32 end_ec_res;
> +	__s32 erase_counters[1000];
> +	__s8  padding[84];
> +}  __packed;
> +

Hi Rickard, please move the definition of 'ubi_ecinfo_req' between 
'ubi_rnvol_req' and 'ubi_leb_change_req'. The last part in 
'include/uapi/mtd/ubi-user.h' defines all structures for the ubi volume 
ioctl.
>   #endif /* __UBI_USER_H__ */
>