linux-kernel - Re: [PATCH 3/4] UBI: Fastmap: Care about the protection queue

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Date:	Thu, 02 Oct 2014 17:14:33 +0300
From:	Tanya Brokhman <tlinder@...eaurora.org>
To:	Richard Weinberger <richard@....at>, dedekind1@...il.com
CC:	linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/4] UBI: Fastmap: Care about the protection queue

On 10/2/2014 4:32 PM, Richard Weinberger wrote:
> Am 02.10.2014 15:28, schrieb Tanya Brokhman:
>> Hi Richard
>>
>> On 9/30/2014 1:20 AM, Richard Weinberger wrote:
>>> Fastmap can miss a PEB if it is in the protection queue
>>> and not jet in the used tree.
>>> Treat every protected PEB as used.
>>>
>>> Signed-off-by: Richard Weinberger <richard@....at>
>>> ---
>>>    drivers/mtd/ubi/fastmap.c | 13 +++++++++++++
>>>    1 file changed, 13 insertions(+)
>>>
>>> diff --git a/drivers/mtd/ubi/fastmap.c b/drivers/mtd/ubi/fastmap.c
>>> index 2b0d8d6..2853a69 100644
>>> --- a/drivers/mtd/ubi/fastmap.c
>>> +++ b/drivers/mtd/ubi/fastmap.c
>>> @@ -1195,6 +1195,19 @@ static int ubi_write_fastmap(struct ubi_device *ubi,
>>>            fm_pos += sizeof(*fec);
>>>            ubi_assert(fm_pos <= ubi->fm_size);
>>>        }
>>> +
>>> +    for (i = 0; i < UBI_PROT_QUEUE_LEN; i++) {
>>> +        list_for_each_entry(wl_e, &ubi->pq[i], u.list) {
>>
>> why not list_for_each_entry_safe?
>
> Because we don't delete elements from this list while iterating over it.
>
>>> +            fec = (struct ubi_fm_ec *)(fm_raw + fm_pos);
>>> +
>>> +            fec->pnum = cpu_to_be32(wl_e->pnum);
>>> +            fec->ec = cpu_to_be32(wl_e->ec);
>>> +
>>> +            used_peb_count++;
>>> +            fm_pos += sizeof(*fec);
>>> +            ubi_assert(fm_pos <= ubi->fm_size);
>>
>> Is fm_size ok with this addition or does it needs updating as well?
>
> It is okay. The fastmap size calculation reserves enough space for all possible
> PEBs.
>
> Thanks,
> //richard
>
> ______________________________________________________
> Linux MTD discussion mailing list
> http://lists.infradead.org/mailman/listinfo/linux-mtd/
>

Reviewed-by: Tanya Brokhman <tlinder@...eaurora.org>

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