diff options
| author |   Shaohua Li <shli@fb.com> | 2017-08-14 15:04:55 -0700 |
|---|---|---|
| committer |   Jens Axboe <axboe@kernel.dk> | 2017-08-23 08:54:05 -0600 |
| commit | 94bc02e30fb8d04429ecf91820abbea0eb5c4ee1 (patch) | |
| tree | bac5eeec638378121c08409c9a74b9f2f83088dc | |
| parent | nullb: add interface to power on disk (diff) | |
| download | linux-dev-94bc02e30fb8d04429ecf91820abbea0eb5c4ee1.tar.xz linux-dev-94bc02e30fb8d04429ecf91820abbea0eb5c4ee1.zip | |
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>
| -rw-r--r-- | drivers/block/null_blk.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/drivers/block/null_blk.c b/drivers/block/null_blk.c index cf14c46d3462..2f66627d8c4b 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); |