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 16:23:45 +0800
From:   Coly Li <colyli@...e.de>
To:     Geliang Tang <geliangtang@...il.com>
Cc:     antlists@...ngman.org.uk, Dan Williams <dan.j.williams@...el.com>,
        linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        Hannes Reinecke <hare@...e.de>, Jens Axboe <axboe@...nel.dk>,
        NeilBrown <neilb@...e.de>, nvdimm@...ts.linux.dev,
        linux-raid@...r.kernel.org, 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

On 9/27/21 3:23 PM, Geliang Tang wrote:
> 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().


OK, I will change it.

>
>> +    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.

Yes, I will change it in next version. Please review the new version latter.

Thanks for your review.

Coly Li