linux-kernel - Re: [PATCH v2] mtd: Fix mtdblock for >4GB MTD devices

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Date:   Mon, 13 Mar 2017 06:07:00 +0100
From:   Marek Vasut <marek.vasut@...il.com>
To:     lepton <ytht.net@...il.com>
Cc:     David Woodhouse <dwmw2@...radead.org>,
        Brian Norris <computersforpeace@...il.com>,
        boris.brezillon@...e-electrons.com, richard@....at,
        cyrille.pitchen@...el.com, linux-mtd@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] mtd: Fix mtdblock for >4GB MTD devices

On 03/01/2017 05:14 AM, lepton wrote:
> If checking some calling side,  the len is from cache_size of struct
> mtdblk_dev, it's defined as unsigned int now. So it's not 64bit yet.

Ummm ... since you're top-posting, I have no clue which part do you
refer to , sorry.

> BTW, seems it's just block size (512) at some other calling side.
> 
> (Sorry for previous same content email, just found out it's html
> format and rejected by mail list)
> 
> On Mon, Feb 27, 2017 at 1:31 AM, Marek Vasut <marek.vasut@...il.com> wrote:
>> On 02/22/2017 03:15 AM, Lepton Wu wrote:
>>> Change to use loff_t instead of unsigned long in some functions
>>> to make sure mtdblock can handle offset bigger than 4G in 32 bits mode.
>>>
>>> Signed-off-by: Lepton Wu <ytht.net@...il.com>
>>> ---
>>>  Changes in v2:
>>>   - Make the commit message more clearer and fix some format issues.
>>>
>>>  drivers/mtd/mtdblock.c    | 35 ++++++++++++++++++-----------------
>>>  drivers/mtd/mtdblock_ro.c |  4 ++--
>>>  2 files changed, 20 insertions(+), 19 deletions(-)
>>>
>>> diff --git a/drivers/mtd/mtdblock.c b/drivers/mtd/mtdblock.c
>>> index bb4c14f83c75..373c0edca803 100644
>>> --- a/drivers/mtd/mtdblock.c
>>> +++ b/drivers/mtd/mtdblock.c
>>> @@ -61,8 +61,8 @@ static void erase_callback(struct erase_info *done)
>>>       wake_up(wait_q);
>>>  }
>>>
>>> -static int erase_write (struct mtd_info *mtd, unsigned long pos,
>>> -                     int len, const char *buf)
>>> +static int erase_write(struct mtd_info *mtd, loff_t pos, int len,
>>> +                    const char *buf)
>>
>> Can the length be 64bit too now ?
>>
>> [...]
>>
>> --
>> Best regards,
>> Marek Vasut


-- 
Best regards,
Marek Vasut