linux-kernel - Re: [PATCH v3 1/6] badblocks: add more helper structure and routines in badblocks.h

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Date:   Mon, 27 Sep 2021 15:23:57 +0800
From:   Geliang Tang <geliangtang@...il.com>
To:     Coly Li <colyli@...e.de>, linux-kernel@...r.kernel.org,
        linux-block@...r.kernel.org, linux-raid@...r.kernel.org,
        nvdimm@...ts.linux.dev
Cc:     antlists@...ngman.org.uk, Dan Williams <dan.j.williams@...el.com>,
        Hannes Reinecke <hare@...e.de>, Jens Axboe <axboe@...nel.dk>,
        NeilBrown <neilb@...e.de>, Richard Fan <richard.fan@...e.com>,
        Vishal L Verma <vishal.l.verma@...el.com>
Subject: Re: [PATCH v3 1/6] badblocks: add more helper structure and routines
 in badblocks.h

Hi Coly,

On 9/14/21 00:36, Coly Li wrote:
> This patch adds the following helper structure and routines into
> badblocks.h,
> - struct badblocks_context
>    This structure is used in improved badblocks code for bad table
>    iteration.
> - BB_END()
>    The macro to culculate end LBA of a bad range record from bad
>    table.
> - badblocks_full() and badblocks_empty()
>    The inline routines to check whether bad table is full or empty.
> - set_changed() and clear_changed()
>    The inline routines to set and clear 'changed' tag from struct
>    badblocks.
> 
> These new helper structure and routines can help to make the code more
> clear, they will be used in the improved badblocks code in following
> patches.
> 
> Signed-off-by: Coly Li <colyli@...e.de>
> Cc: Dan Williams <dan.j.williams@...el.com>
> Cc: Hannes Reinecke <hare@...e.de>
> Cc: Jens Axboe <axboe@...nel.dk>
> Cc: NeilBrown <neilb@...e.de>
> Cc: Richard Fan <richard.fan@...e.com>
> Cc: Vishal L Verma <vishal.l.verma@...el.com>
> ---
>   include/linux/badblocks.h | 32 ++++++++++++++++++++++++++++++++
>   1 file changed, 32 insertions(+)
> 
> diff --git a/include/linux/badblocks.h b/include/linux/badblocks.h
> index 2426276b9bd3..166161842d1f 100644
> --- a/include/linux/badblocks.h
> +++ b/include/linux/badblocks.h
> @@ -15,6 +15,7 @@
>   #define BB_OFFSET(x)	(((x) & BB_OFFSET_MASK) >> 9)
>   #define BB_LEN(x)	(((x) & BB_LEN_MASK) + 1)
>   #define BB_ACK(x)	(!!((x) & BB_ACK_MASK))
> +#define BB_END(x)	(BB_OFFSET(x) + BB_LEN(x))
>   #define BB_MAKE(a, l, ack) (((a)<<9) | ((l)-1) | ((u64)(!!(ack)) << 63))
>   
>   /* Bad block numbers are stored sorted in a single page.
> @@ -41,6 +42,14 @@ struct badblocks {
>   	sector_t size;		/* in sectors */
>   };
>   
> +struct badblocks_context {
> +	sector_t	start;
> +	sector_t	len;

I think the type of 'len' should be 'int' instead of 'sector_t', since 
we used 'int sectors' as one of the arguments of _badblocks_set().

> +	int		ack;
> +	sector_t	orig_start;
> +	sector_t	orig_len;

I think 'orig_start' and 'orig_len' can be dropped, see comments in patch 3.

> +};
> +
>   int badblocks_check(struct badblocks *bb, sector_t s, int sectors,
>   		   sector_t *first_bad, int *bad_sectors);
>   int badblocks_set(struct badblocks *bb, sector_t s, int sectors,
> @@ -63,4 +72,27 @@ static inline void devm_exit_badblocks(struct device *dev, struct badblocks *bb)
>   	}
>   	badblocks_exit(bb);
>   }
> +
> +static inline int badblocks_full(struct badblocks *bb)
> +{
> +	return (bb->count >= MAX_BADBLOCKS);
> +}
> +
> +static inline int badblocks_empty(struct badblocks *bb)
> +{
> +	return (bb->count == 0);
> +}
> +
> +static inline void set_changed(struct badblocks *bb)
> +{
> +	if (bb->changed != 1)
> +		bb->changed = 1;
> +}
> +
> +static inline void clear_changed(struct badblocks *bb)
> +{
> +	if (bb->changed != 0)
> +		bb->changed = 0;
> +}
> +
>   #endif
>