Will do. i'll squash your patch with my two. Your commit message is
better, so i hope you don't mind me using it :)
All the best,
Hans
On Mon, Aug 20, 2018 at 2:46 PM, Matias Bjørling <mb@xxxxxxxxxxx> wrote:
> On 08/20/2018 02:38 PM, Javier Gonzalez wrote:
>>>
>>> On 20 Aug 2018, at 14.12, Matias Bjørling <mb@xxxxxxxxxxx> wrote:
>>>
>>> There is a number of places in the lightnvm subsystem where the user
>>> iterates over the ppa list. Before iterating, the user must know if it
>>> is a single or multiple LBAs due to vector commands using either the
>>> nvm_rq ->ppa_addr or ->ppa_list fields on command submission, which
>>> leads to open-coding the if/else statement.
>>>
>>> Instead of having multiple if/else's, move it into a function that can
>>> be called by its users.
>>>
>>> Signed-off-by: Matias Bjørling <mb@xxxxxxxxxxx>
>>> ---
>>> drivers/lightnvm/pblk-read.c | 4 +---
>>> drivers/lightnvm/pblk-write.c | 5 +----
>>> drivers/lightnvm/pblk.h | 4 +---
>>> include/linux/lightnvm.h | 5 +++++
>>> 4 files changed, 8 insertions(+), 10 deletions(-)
>>>
>>> diff --git a/drivers/lightnvm/pblk-read.c b/drivers/lightnvm/pblk-read.c
>>> index f275c7e5abe4..696d3a9c9cf0 100644
>>> --- a/drivers/lightnvm/pblk-read.c
>>> +++ b/drivers/lightnvm/pblk-read.c
>>> @@ -175,11 +175,9 @@ static void __pblk_read_put_line(struct pblk *pblk,
>>> struct ppa_addr ppa)
>>>
>>> static void pblk_read_put_line(struct pblk *pblk, struct nvm_rq *rqd)
>>> {
>>> - struct ppa_addr *ppa_list;
>>> + struct ppa_addr *ppa_list = nvm_rq_to_ppa_list(rqd);
>>> int i;
>>>
>>> - ppa_list = (rqd->nr_ppas > 1) ? rqd->ppa_list : &rqd->ppa_addr;
>>> -
>>> for (i = 0; i < rqd->nr_ppas; i++)
>>> __pblk_read_put_line(pblk, ppa_list[i]);
>>> }
>>> diff --git a/drivers/lightnvm/pblk-write.c
>>> b/drivers/lightnvm/pblk-write.c
>>> index df99c45778d4..a92450ec7698 100644
>>> --- a/drivers/lightnvm/pblk-write.c
>>> +++ b/drivers/lightnvm/pblk-write.c
>>> @@ -212,10 +212,7 @@ static void pblk_submit_rec(struct work_struct
>>> *work)
>>>
>>> pblk_log_write_err(pblk, rqd);
>>>
>>> - if (rqd->nr_ppas == 1)
>>> - ppa_list = &rqd->ppa_addr;
>>> - else
>>> - ppa_list = rqd->ppa_list;
>>> + ppa_list = nvm_rq_to_ppa_list(rqd);
>>>
>>> pblk_map_remaining(pblk, ppa_list);
>>> pblk_queue_resubmit(pblk, c_ctx);
>>> diff --git a/drivers/lightnvm/pblk.h b/drivers/lightnvm/pblk.h
>>> index 64ae0c7ed3bb..bda098c7cc3b 100644
>>> --- a/drivers/lightnvm/pblk.h
>>> +++ b/drivers/lightnvm/pblk.h
>>> @@ -1335,9 +1335,7 @@ static inline int pblk_boundary_ppa_checks(struct
>>> nvm_tgt_dev *tgt_dev,
>>> static inline int pblk_check_io(struct pblk *pblk, struct nvm_rq *rqd)
>>> {
>>> struct nvm_tgt_dev *dev = pblk->dev;
>>> - struct ppa_addr *ppa_list;
>>> -
>>> - ppa_list = (rqd->nr_ppas > 1) ? rqd->ppa_list : &rqd->ppa_addr;
>>> + struct ppa_addr *ppa_list = nvm_rq_to_ppa_list(rqd);
>>>
>>> if (pblk_boundary_ppa_checks(dev, ppa_list, rqd->nr_ppas)) {
>>> WARN_ON(1);
>>> diff --git a/include/linux/lightnvm.h b/include/linux/lightnvm.h
>>> index 0106984400bc..1497e275f90f 100644
>>> --- a/include/linux/lightnvm.h
>>> +++ b/include/linux/lightnvm.h
>>> @@ -487,6 +487,11 @@ static inline struct ppa_addr
>>> dev_to_generic_addr(struct nvm_dev *dev,
>>> return l;
>>> }
>>>
>>> +static inline struct ppa_addr *nvm_rq_to_ppa_list(struct nvm_rq *rqd)
>>> +{
>>> + return (rqd->nr_ppas > 1) ? rqd->ppa_list : &rqd->ppa_addr;
>>> +}
>>> +
>>> typedef blk_qc_t (nvm_tgt_make_rq_fn)(struct request_queue *, struct bio
>>> *);
>>> typedef sector_t (nvm_tgt_capacity_fn)(void *);
>>> typedef void *(nvm_tgt_init_fn)(struct nvm_tgt_dev *, struct gendisk *,
>>> --
>>> 2.11.0
>>
>>
>> Hans made a similar patch some time ago. There are a number of places
>> where you want to use this helper too, also outside of pblk. You can
>> look at it here [1]
>>
>> [1] https://github.com/OpenChannelSSD/linux/commits/for-4.20/pblk
>>
>> fdd88185bfed
>> 17609afb2db9
>>
>> Javier
>>
>
> I like Hans' better. Hans, could you please merge my patch with yours? I
> prefer the nvm_rq_to_ppa_list naming, rqdata -> rqd, and if short-hand.
>
