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| author | Matias Bjørling <m@bjorling.me> | 2016-09-16 14:25:07 +0200 |
|---|---|---|
| committer | Jens Axboe <axboe@fb.com> | 2016-09-21 15:56:18 +0200 |
| commit | b0b4e09c1ae71c4ec33df0616b830ae050006e9b (patch) | |
| tree | 67a148740845d77af662b36ec17d88f991c84d72 /drivers/block/null_blk.c | |
| parent | blk-mq: register device instead of disk (diff) | |
| download | linux-b0b4e09c1ae71c4ec33df0616b830ae050006e9b.tar.xz linux-b0b4e09c1ae71c4ec33df0616b830ae050006e9b.zip | |
lightnvm: control life of nvm_dev in driver
LightNVM compatible device drivers does not have a method to expose
LightNVM specific sysfs entries.
To enable LightNVM sysfs entries to be exposed, lightnvm device
drivers require a struct device to attach it to. To allow both the
actual device driver and lightnvm sysfs entries to coexist, the device
driver tracks the lifetime of the nvm_dev structure.
This patch refactors NVMe and null_blk to handle the lifetime of struct
nvm_dev, which eliminates the need for struct gendisk when a lightnvm
compatible device is provided.
Signed-off-by: Matias Bjørling <m@bjorling.me>
Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'drivers/block/null_blk.c')
| -rw-r--r-- | drivers/block/null_blk.c | 22 |
1 files changed, 20 insertions, 2 deletions
diff --git a/drivers/block/null_blk.c b/drivers/block/null_blk.c index 895867a8a783..91e1de898daf 100644 --- a/drivers/block/null_blk.c +++ b/drivers/block/null_blk.c @@ -34,6 +34,7 @@ struct nullb { unsigned int index; struct request_queue *q; struct gendisk *disk; + struct nvm_dev *ndev; struct blk_mq_tag_set tag_set; struct hrtimer timer; unsigned int queue_depth; @@ -550,12 +551,29 @@ static struct nvm_dev_ops null_lnvm_dev_ops = { static int null_nvm_register(struct nullb *nullb) { - return nvm_register(nullb->q, nullb->disk_name, &null_lnvm_dev_ops); + struct nvm_dev *dev; + int rv; + + dev = nvm_alloc_dev(0); + if (!dev) + return -ENOMEM; + + dev->q = nullb->q; + memcpy(dev->name, nullb->disk_name, DISK_NAME_LEN); + dev->ops = &null_lnvm_dev_ops; + + rv = nvm_register(dev); + if (rv) { + kfree(dev); + return rv; + } + nullb->ndev = dev; + return 0; } static void null_nvm_unregister(struct nullb *nullb) { - nvm_unregister(nullb->disk_name); + nvm_unregister(nullb->ndev); } #else static int null_nvm_register(struct nullb *nullb) |