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lightnvm: add a bitmap of luns

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Add a bitmap of luns to indicate the status
of luns: inuse/available. When create targets
do the necessary check to avoid allocating luns
that are already allocated.

Signed-off-by: Wenwei Tao <ww.tao0320@gmail.com>
Freed dev->lun_map if nvm_core_init later failed in the init process.
Signed-off-by: Matias Bjørling <m@bjorling.me>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Wenwei Tao
2016-03-03 15:06:38 +01:00
committed by Jens Axboe
parent 4c9dacb82d
commit da1e284919
4 changed files with 74 additions and 29 deletions
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18
drivers/lightnvm/gennvm.c
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@@ -192,6 +192,9 @@ static int gennvm_block_map(u64 slba, u32 nlb, __le64 *entries, void *private)
lun_id = div_u64(pba, dev->sec_per_lun);
lun = &gn->luns[lun_id];
if (!test_bit(lun_id, dev->lun_map))
__set_bit(lun_id, dev->lun_map);
/* Calculate block offset into lun */
pba = pba - (dev->sec_per_lun * lun_id);
blk = &lun->vlun.blocks[div_u64(pba, dev->sec_per_blk)];
@@ -482,10 +485,23 @@ static int gennvm_erase_blk(struct nvm_dev *dev, struct nvm_block *blk,
return nvm_erase_ppa(dev, &addr, 1);
}
static int gennvm_reserve_lun(struct nvm_dev *dev, int lunid)
{
return test_and_set_bit(lunid, dev->lun_map);
}
static void gennvm_release_lun(struct nvm_dev *dev, int lunid)
{
WARN_ON(!test_and_clear_bit(lunid, dev->lun_map));
}
static struct nvm_lun *gennvm_get_lun(struct nvm_dev *dev, int lunid)
{
struct gen_nvm *gn = dev->mp;
if (unlikely(lunid >= dev->nr_luns))
return NULL;
return &gn->luns[lunid].vlun;
}
@@ -527,6 +543,8 @@ static struct nvmm_type gennvm = {
.erase_blk = gennvm_erase_blk,
.get_lun = gennvm_get_lun,
.reserve_lun = gennvm_reserve_lun,
.release_lun = gennvm_release_lun,
.lun_info_print = gennvm_lun_info_print,
.get_area = gennvm_get_area,