Re: [PATCH v3 3/6] badblocks: improvement badblocks_set() for multiple ranges handling

[Coly Li <colyli@suse.de>]

On 9/27/21 3:30 PM, Geliang Tang wrote:
> On 9/14/21 00:36, Coly Li wrote:

[snipped]
>> + * 2.1.1) If S and E are both acked or unacked range, the setting 
>> range S can
>> + *    be merged into existing bad range E. The result is,
>> + *        +-------------+
>> + *        |      S      |
>> + *        +-------------+
>> + * 2.1.2) If S is uncked setting and E is acked, the setting will be 
>> dinied, and
>
> uncked -> unacked
> dinied?
>

You are correct, it should be unacked.

>> + *    the result is,
>> + *        +-------------+
>> + *        |      E      |
>> + *        +-------------+
>> + * 2.1.3) If S is acked setting and E is unacked, range S can 
>> overwirte on E.
>> + *    An extra slot from the bad blocks table will be allocated for 
>> S, and head
>> + *    of E will move to end of the inserted range E. The result is,
>> + *        +--------+----+
>> + *        |    S   | E  |
>> + *        +--------+----+
>> + * 2.2) The setting range size == already set range size
>> + * 2.2.1) If S and E are both acked or unacked range, the setting 
>> range S can
>> + *    be merged into existing bad range E. The result is,
>> + *        +-------------+
>> + *        |      S      |
>> + *        +-------------+
>> + * 2.2.2) If S is uncked setting and E is acked, the setting will be 
>> dinied, and
>
> uncked -> unacked

Yes, thanks for pointing out the typo. I will fix them in next version.

[snipped]
>> +/* Do exact work to set bad block range into the bad block table */
>> +static int _badblocks_set(struct badblocks *bb, sector_t s, int 
>> sectors,
>> +              int acknowledged)
>> +{
>> +    u64 *p;
>> +    struct badblocks_context bad;
>> +    int prev = -1, hint = -1;
>> +    int len = 0, added = 0;
>> +    int retried = 0, space_desired = 0;
>> +    int rv = 0;
>> +    unsigned long flags;
>
> orig_start and orig_len are used in _badblocks_set() only, we can drop 
> them from struct badblocks_context, declare two local variables instead:
>
>         sector_t orig_start;
>         int orig_len;
>

It's fair, let me change it in next version.

[snipped]

Thanks for your review!

Coly Li