linux-kernel - Re: [RFC PATCH v1 1/6] badblocks: add more helper structure and routines in badblocks.h

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Date:   Wed, 3 Mar 2021 19:45:07 +0800
From:   Coly Li <colyli@...e.de>
To:     Hannes Reinecke <hare@...e.de>
Cc:     antlists@...ngman.org.uk, axboe@...nel.dk,
        linux-kernel@...r.kernel.org, dan.j.williams@...el.com,
        linux-raid@...r.kernel.org, vishal.l.verma@...el.com,
        linux-nvdimm@...ts.01.org, linux-block@...r.kernel.org,
        neilb@...e.de
Subject: Re: [RFC PATCH v1 1/6] badblocks: add more helper structure and
 routines in badblocks.h

On 3/3/21 4:20 PM, Hannes Reinecke wrote:
> On 3/2/21 5:02 AM, Coly Li wrote:
>> This patch adds the following helper structure and routines into
>> badblocks.h,
>> - struct bad_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>
>> ---
>>  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 bad_context {
>> +	sector_t	start;
>> +	sector_t	len;
>> +	int		ack;
>> +	sector_t	orig_start;
>> +	sector_t	orig_len;
>> +};
>> +
> Maybe rename it to 'badblocks_context'.
> It's not the context which is bad ...
> 

Copied, I will modify it in next version.

Thanks for the suggestion.

Coly Li