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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: Shaohua Li <shli@fb.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Shaohua Li 2017-08-14 15:04:55 -07:00 committed by Jens Axboe
parent cedcafad82
commit 94bc02e30f
1 changed files with 4 additions and 2 deletions
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6
drivers/block/null_blk.c
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@ -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);