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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>
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parent
cedcafad82
commit
94bc02e30f
1 changed files with 4 additions and 2 deletions
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@ -87,7 +87,7 @@ struct nullb {
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static LIST_HEAD(nullb_list);
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static LIST_HEAD(nullb_list);
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static struct mutex lock;
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static struct mutex lock;
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static int null_major;
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static int null_major;
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static int nullb_indexes;
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static DEFINE_IDA(nullb_indexes);
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static struct kmem_cache *ppa_cache;
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static struct kmem_cache *ppa_cache;
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static struct blk_mq_tag_set tag_set;
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static struct blk_mq_tag_set tag_set;
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@ -871,6 +871,8 @@ static void null_del_dev(struct nullb *nullb)
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{
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{
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struct nullb_device *dev = nullb->dev;
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struct nullb_device *dev = nullb->dev;
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ida_simple_remove(&nullb_indexes, nullb->index);
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list_del_init(&nullb->list);
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list_del_init(&nullb->list);
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if (dev->use_lightnvm)
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if (dev->use_lightnvm)
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@ -1118,7 +1120,7 @@ static int null_add_dev(struct nullb_device *dev)
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queue_flag_clear_unlocked(QUEUE_FLAG_ADD_RANDOM, nullb->q);
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queue_flag_clear_unlocked(QUEUE_FLAG_ADD_RANDOM, nullb->q);
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mutex_lock(&lock);
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mutex_lock(&lock);
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nullb->index = nullb_indexes++;
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nullb->index = ida_simple_get(&nullb_indexes, 0, 0, GFP_KERNEL);
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dev->index = nullb->index;
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dev->index = nullb->index;
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mutex_unlock(&lock);
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mutex_unlock(&lock);
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