From: Shaohua Li <shli@xxxxxx>
We now dynamically create disks. Managing the disk index with ida to
avoid bump up the index too much.
Signed-off-by: Shaohua Li <shli@xxxxxx>
---
drivers/block/null_blk.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/drivers/block/null_blk.c b/drivers/block/null_blk.c
index cf14c46..2f66627 100644
--- a/drivers/block/null_blk.c
+++ b/drivers/block/null_blk.c
@@ -87,7 +87,7 @@ struct nullb {
static LIST_HEAD(nullb_list);
static struct mutex lock;
static int null_major;
-static int nullb_indexes;
+static DEFINE_IDA(nullb_indexes);
static struct kmem_cache *ppa_cache;
static struct blk_mq_tag_set tag_set;
@@ -871,6 +871,8 @@ static void null_del_dev(struct nullb *nullb)
{
struct nullb_device *dev = nullb->dev;
+ ida_simple_remove(&nullb_indexes, nullb->index);
+
list_del_init(&nullb->list);
if (dev->use_lightnvm)
@@ -1118,7 +1120,7 @@ static int null_add_dev(struct nullb_device *dev)
queue_flag_clear_unlocked(QUEUE_FLAG_ADD_RANDOM, nullb->q);
mutex_lock(&lock);
- nullb->index = nullb_indexes++;
+ nullb->index = ida_simple_get(&nullb_indexes, 0, 0, GFP_KERNEL);
dev->index = nullb->index;
mutex_unlock(&lock);
--
2.9.5
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