Commit 94bc02e3 authored by Shaohua Li's avatar Shaohua Li Committed by Jens Axboe
Browse files

nullb: use ida to manage index 



We now dynamically create disks. Managing the disk index with ida to
avoid bump up the index too much.

Signed-off-by: default avatarShaohua Li <shli@fb.com>
Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent cedcafad

drivers/block/null_blk.c

+4 −2
Original line number Diff line number Diff line
@@ -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);