Re: [PATCH v2 1/2] lightnvm: specify target's logical address area

Wenwei Tao
2016-01-27T02:21:51Z

Yes, It's a spelling mistake, will correct it in next version.

2016-01-26 22:52 GMT+08:00 Matias Bjørling <mb@lightnvm.io>:
> On 01/26/2016 01:33 PM, Wenwei Tao wrote:
>> We can create more than one target on a lightnvm
>> device by specifying its begin lun and end lun.
>>
>> But only specify the physical address area is not
>> enough, we need to get the corresponding non-
>> intersection logical address area division from
>> the backend device's logcial address space.
>> Otherwise the targets on the device might use
>> the same logical addresses cause incorrect
>> information in the device's l2p table.
>>
>> Signed-off-by: Wenwei Tao <ww.tao0320@gmail.com>
>> ---
>> Changes since v1:
>> - rename some variables
>> - add parentheses for clarity
>> - make gennvm_get_area return int, and add one more sector_t* parameter
>> to pass the begin sector of the corresponding target
>> - rebase to v4.5-rc1
>>
>> drivers/lightnvm/core.c | 1 +
>> drivers/lightnvm/gennvm.c | 59 +++++++++++++++++++++++++++++++++++++++++++++++
>> drivers/lightnvm/gennvm.h | 6 +++++
>> drivers/lightnvm/rrpc.c | 45 +++++++++++++++++++++++++++++++++---
>> drivers/lightnvm/rrpc.h | 1 +
>> include/linux/lightnvm.h | 8 +++++++
>> 6 files changed, 117 insertions(+), 3 deletions(-)
>>
>> diff --git a/drivers/lightnvm/core.c b/drivers/lightnvm/core.c
>> index 33224cb..27a59e8 100644
>> --- a/drivers/lightnvm/core.c
>> +++ b/drivers/lightnvm/core.c
>> @@ -470,6 +470,7 @@ static int nvm_core_init(struct nvm_dev *dev)
>> dev->total_pages = dev->total_blocks * dev->pgs_per_blk;
>> INIT_LIST_HEAD(&dev->online_targets);
>> mutex_init(&dev->mlock);
>> + spin_lock_init(&dev->lock);
>>
>> return 0;
>> }
>> diff --git a/drivers/lightnvm/gennvm.c b/drivers/lightnvm/gennvm.c
>> index 7fb725b..34ea4ff 100644
>> --- a/drivers/lightnvm/gennvm.c
>> +++ b/drivers/lightnvm/gennvm.c
>> @@ -20,6 +20,60 @@
>>
>> #include "gennvm.h"
>>
>> +static int gennvm_get_area(struct nvm_dev *dev, sector_t *begin_sect,
>> + sector_t size)
>> +{
>> + struct gen_nvm *gn = dev->mp;
>> + struct gennvm_area *area, *prev;
>> + sector_t begin = 0;
>> + int page_size = dev->sec_size * dev->sec_per_pg;
>> + sector_t max_sectors = (page_size * dev->total_pages) >> 9;
>> +
>> + if (size > max_sectors)
>> + return -EINVAL;
>> + area = kmalloc(sizeof(struct gennvm_area), GFP_KERNEL);
>> + if (!area)
>> + return -ENOMEM;
>> +
>> + spin_lock(&dev->lock);
>> + list_for_each_entry(prev, &gn->area_list, list) {
>> + if (begin + size > prev->begin) {
>> + begin = prev->end;
>> + continue;
>> + }
>> + break;
>> + }
>> +
>> + if ((begin + size) > max_sectors) {
>> + spin_unlock(&dev->lock);
>> + kfree(area);
>> + return -EINVAL;
>> + }
>> +
>> + area->begin = *begin_sect = begin;
>> + area->end = begin + size;
>> + list_add(&area->list, &prev->list);
>> + spin_unlock(&dev->lock);
>> + return 0;
>> +}
>> +
>> +static void gennvm_put_area(struct nvm_dev *dev, sector_t begin)
>> +{
>> + struct gen_nvm *gn = dev->mp;
>> + struct gennvm_area *area;
>> +
>> + spin_lock(&dev->lock);
>> + list_for_each_entry(area, &gn->area_list, list) {
>> + if (area->begin == begin) {
>> + list_del(&area->list);
>> + spin_unlock(&dev->lock);
>> + kfree(area);
>> + return;
>> + }
>> + }
>> + spin_unlock(&dev->lock);
>> +}
>> +
>> static void gennvm_blocks_free(struct nvm_dev *dev)
>> {
>> struct gen_nvm *gn = dev->mp;
>> @@ -230,6 +284,7 @@ static int gennvm_register(struct nvm_dev *dev)
>>
>> gn->dev = dev;
>> gn->nr_luns = dev->nr_luns;
>> + INIT_LIST_HEAD(&gn->area_list);
>> dev->mp = gn;
>>
>> ret = gennvm_luns_init(dev, gn);
>> @@ -466,6 +521,10 @@ static struct nvmm_type gennvm = {
>>
>> .get_lun = gennvm_get_lun,
>> .lun_info_print = gennvm_lun_info_print,
>> +
>> + .get_area = gennvm_get_area,
>> + .put_area = gennvm_put_area,
>> +
>> };
>>
>> static int __init gennvm_module_init(void)
>> diff --git a/drivers/lightnvm/gennvm.h b/drivers/lightnvm/gennvm.h
>> index 9c24b5b..04d7c23 100644
>> --- a/drivers/lightnvm/gennvm.h
>> +++ b/drivers/lightnvm/gennvm.h
>> @@ -39,8 +39,14 @@ struct gen_nvm {
>>
>> int nr_luns;
>> struct gen_lun *luns;
>> + struct list_head area_list;
>> };
>>
>> +struct gennvm_area {
>> + struct list_head list;
>> + sector_t begin;
>> + sector_t end; /* end is excluded */
>> +};
>> #define gennvm_for_each_lun(bm, lun, i) \
>> for ((i) = 0, lun = &(bm)->luns[0]; \
>> (i) < (bm)->nr_luns; (i)++, lun = &(bm)->luns[(i)])
>> diff --git a/drivers/lightnvm/rrpc.c b/drivers/lightnvm/rrpc.c
>> index d8c7595..c8c27f9 100644
>> --- a/drivers/lightnvm/rrpc.c
>> +++ b/drivers/lightnvm/rrpc.c
>> @@ -1042,7 +1042,18 @@ static int rrpc_map_init(struct rrpc *rrpc)
>> {
>> struct nvm_dev *dev = rrpc->dev;
>> sector_t i;
>> - int ret;
>> + u64 slba;
>> + int ret, page_size;
>> + int page_shfit, nr_pages;
>
> Did you mean page_shift here?
>