[PATCH 2/3] lightnvm: add a bitmap of luns
From: Wenwei Tao
Date: Thu Feb 04 2016 - 06:36:20 EST
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@xxxxxxxxx>
---
drivers/lightnvm/core.c | 5 ++++
drivers/lightnvm/gennvm.c | 18 +++++++++++++++
drivers/lightnvm/rrpc.c | 59 +++++++++++++++++++++++++++++++++++------------
include/linux/lightnvm.h | 5 ++++
4 files changed, 72 insertions(+), 15 deletions(-)
diff --git a/drivers/lightnvm/core.c b/drivers/lightnvm/core.c
index 93c035b..11b8e2d 100644
--- a/drivers/lightnvm/core.c
+++ b/drivers/lightnvm/core.c
@@ -464,6 +464,10 @@ static int nvm_core_init(struct nvm_dev *dev)
dev->nr_luns = dev->luns_per_chnl * dev->nr_chnls;
dev->total_secs = dev->nr_luns * dev->sec_per_lun;
+ dev->lun_map = kcalloc(BITS_TO_LONGS(dev->nr_luns),
+ sizeof(unsigned long), GFP_KERNEL);
+ if (!dev->lun_map)
+ return -ENOMEM;
INIT_LIST_HEAD(&dev->online_targets);
mutex_init(&dev->mlock);
spin_lock_init(&dev->lock);
@@ -606,6 +610,7 @@ void nvm_unregister(char *disk_name)
up_write(&nvm_lock);
nvm_exit(dev);
+ kfree(dev->lun_map);
kfree(dev);
}
EXPORT_SYMBOL(nvm_unregister);
diff --git a/drivers/lightnvm/gennvm.c b/drivers/lightnvm/gennvm.c
index fba3fbd..adc10c2 100644
--- a/drivers/lightnvm/gennvm.c
+++ b/drivers/lightnvm/gennvm.c
@@ -190,6 +190,9 @@ 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)];
@@ -480,10 +483,23 @@ 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;
}
@@ -525,6 +541,8 @@ 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,
diff --git a/drivers/lightnvm/rrpc.c b/drivers/lightnvm/rrpc.c
index 6ce5f73..2bd5789 100644
--- a/drivers/lightnvm/rrpc.c
+++ b/drivers/lightnvm/rrpc.c
@@ -1128,6 +1128,22 @@ static void rrpc_core_free(struct rrpc *rrpc)
static void rrpc_luns_free(struct rrpc *rrpc)
{
+ struct nvm_dev *dev = rrpc->dev;
+ struct nvm_lun *lun;
+ struct rrpc_lun *rlun;
+ int i;
+
+ if (!rrpc->luns)
+ return;
+
+ for (i = 0; i < rrpc->nr_luns; i++) {
+ rlun = &rrpc->luns[i];
+ lun = rlun->parent;
+ if (!lun)
+ break;
+ dev->mt->release_lun(dev, lun->id);
+ vfree(rlun->blocks);
+ }
kfree(rrpc->luns);
}
@@ -1135,7 +1151,7 @@ static int rrpc_luns_init(struct rrpc *rrpc, int lun_begin, int lun_end)
{
struct nvm_dev *dev = rrpc->dev;
struct rrpc_lun *rlun;
- int i, j;
+ int i, j, ret = -EINVAL;
if (dev->pgs_per_blk > MAX_INVALID_PAGES_STORAGE * BITS_PER_LONG) {
pr_err("rrpc: number of pages per block too high.");
@@ -1151,25 +1167,26 @@ static int rrpc_luns_init(struct rrpc *rrpc, int lun_begin, int lun_end)
/* 1:1 mapping */
for (i = 0; i < rrpc->nr_luns; i++) {
- struct nvm_lun *lun = dev->mt->get_lun(dev, lun_begin + i);
+ int lunid = lun_begin + i;
+ struct nvm_lun *lun;
- rlun = &rrpc->luns[i];
- rlun->rrpc = rrpc;
- rlun->parent = lun;
- INIT_LIST_HEAD(&rlun->prio_list);
- INIT_LIST_HEAD(&rlun->open_list);
- INIT_LIST_HEAD(&rlun->closed_list);
-
- INIT_WORK(&rlun->ws_gc, rrpc_lun_gc);
- spin_lock_init(&rlun->lock);
+ if (dev->mt->reserve_lun(dev, lunid)) {
+ pr_err("rrpc: lun %u is already allocated\n", lunid);
+ goto err;
+ }
- rrpc->total_blocks += dev->blks_per_lun;
- rrpc->nr_sects += dev->sec_per_lun;
+ lun = dev->mt->get_lun(dev, lunid);
+ if (!lun)
+ goto err;
+ rlun = &rrpc->luns[i];
+ rlun->parent = lun;
rlun->blocks = vzalloc(sizeof(struct rrpc_block) *
rrpc->dev->blks_per_lun);
- if (!rlun->blocks)
+ if (!rlun->blocks) {
+ ret = -ENOMEM;
goto err;
+ }
for (j = 0; j < rrpc->dev->blks_per_lun; j++) {
struct rrpc_block *rblk = &rlun->blocks[j];
@@ -1180,11 +1197,23 @@ static int rrpc_luns_init(struct rrpc *rrpc, int lun_begin, int lun_end)
INIT_LIST_HEAD(&rblk->prio);
spin_lock_init(&rblk->lock);
}
+
+ rlun->rrpc = rrpc;
+ INIT_LIST_HEAD(&rlun->prio_list);
+ INIT_LIST_HEAD(&rlun->open_list);
+ INIT_LIST_HEAD(&rlun->closed_list);
+
+ INIT_WORK(&rlun->ws_gc, rrpc_lun_gc);
+ spin_lock_init(&rlun->lock);
+
+ rrpc->total_blocks += dev->blks_per_lun;
+ rrpc->nr_sects += dev->sec_per_lun;
+
}
return 0;
err:
- return -ENOMEM;
+ return ret;
}
/* returns 0 on success and stores the beginning address in *begin */
diff --git a/include/linux/lightnvm.h b/include/linux/lightnvm.h
index ce58ad5..2a17dc1 100644
--- a/include/linux/lightnvm.h
+++ b/include/linux/lightnvm.h
@@ -342,6 +342,7 @@ struct nvm_dev {
int nr_luns;
unsigned max_pages_per_blk;
+ unsigned long *lun_map;
void *ppalist_pool;
struct nvm_id identity;
@@ -462,6 +463,8 @@ typedef int (nvmm_submit_io_fn)(struct nvm_dev *, struct nvm_rq *);
typedef int (nvmm_erase_blk_fn)(struct nvm_dev *, struct nvm_block *,
unsigned long);
typedef struct nvm_lun *(nvmm_get_lun_fn)(struct nvm_dev *, int);
+typedef int (nvmm_reserve_lun)(struct nvm_dev *, int);
+typedef void (nvmm_release_lun)(struct nvm_dev *, int);
typedef void (nvmm_lun_info_print_fn)(struct nvm_dev *);
typedef int (nvmm_get_area_fn)(struct nvm_dev *, sector_t *, sector_t);
@@ -488,6 +491,8 @@ struct nvmm_type {
/* Configuration management */
nvmm_get_lun_fn *get_lun;
+ nvmm_reserve_lun *reserve_lun;
+ nvmm_release_lun *release_lun;
/* Statistics */
nvmm_lun_info_print_fn *lun_info_print;
--
1.8.3.1