linux-kernel - Re: [PATCH 2/2] lightnvm: use relative logical address in rrpc_l2p

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Date:	Thu, 31 Mar 2016 19:09:08 +0800
From:	Wenwei Tao <ww.tao0320@...il.com>
To:	Matias Bjørling <mb@...htnvm.io>
Cc:	linux-kernel@...r.kernel.org, linux-block@...r.kernel.org
Subject: Re: [PATCH 2/2] lightnvm: use relative logical address in rrpc_l2p_update

Okay, I'll send a patch to cover that change.

2016-03-31 17:11 GMT+08:00 Matias Bjørling <mb@...htnvm.io>:
> On 03/30/2016 04:28 PM, Wenwei Tao wrote:
>>
>> Since every target now has their own logical address area,
>> we should deal trans_map and rev_trans_map with relative
>> logical address instead of the global one.
>>
>> Signed-off-by: Wenwei Tao <ww.tao0320@...il.com>
>> ---
>>   drivers/lightnvm/rrpc.c | 12 ++++++++----
>>   1 file changed, 8 insertions(+), 4 deletions(-)
>>
>> diff --git a/drivers/lightnvm/rrpc.c b/drivers/lightnvm/rrpc.c
>> index 516a045..2279bd7 100644
>> --- a/drivers/lightnvm/rrpc.c
>> +++ b/drivers/lightnvm/rrpc.c
>> @@ -998,10 +998,14 @@ static int rrpc_l2p_update(u64 slba, u32 nlb, __le64
>> *entries, void *private)
>>   {
>>         struct rrpc *rrpc = (struct rrpc *)private;
>>         struct nvm_dev *dev = rrpc->dev;
>> -       struct rrpc_addr *addr = rrpc->trans_map + slba;
>> -       struct rrpc_rev_addr *raddr = rrpc->rev_trans_map;
>> -       u64 elba = slba + nlb;
>> -       u64 i;
>> +       struct rrpc_addr *addr;
>> +       struct rrpc_rev_addr *raddr;
>> +       u64 elba, i;
>> +
>> +       slba -= rrpc->soffset >> (ilog2(dev->sec_size) - 9);
>> +       addr = rrpc->trans_map + slba;
>> +       raddr = rrpc->rev_trans_map;
>> +       elba = slba + nlb;
>>
>>         if (unlikely(elba > dev->total_secs)) {
>>                 pr_err("nvm: L2P data from device is out of bounds!\n");
>>
>
> Hi Wenwei,
>
> How about storing the value of "rrpc->soffset >> (ilog2(dev->sec_size) - 9)"
> in rrpc->soffset. That let us only do the shifting for get/put area calls.