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NVMe: Namespace removal simplifications 

This liberates namespace removal from the device, allowing gendisk
references to be closed independent of the nvme controller reference
count.

Signed-off-by: Keith Busch <keith.busch@intel.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@fb.com>
hifive-unleashed-5.1
Keith Busch 2015-10-02 10:37:28 -06:00 committed by Jens Axboe
parent 188c3568f8
commit 5105aa555c
1 changed files with 10 additions and 32 deletions
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42
drivers/block/nvme-core.c
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@ -1943,6 +1943,7 @@ static int nvme_compat_ioctl(struct block_device *bdev, fmode_t mode,
#define nvme_compat_ioctl NULL
#endif
static void nvme_free_dev(struct kref *kref);
static void nvme_free_ns(struct kref *kref)
{
struct nvme_ns *ns = container_of(kref, struct nvme_ns, kref);
@ -1951,6 +1952,7 @@ static void nvme_free_ns(struct kref *kref)
ns->disk->private_data = NULL;
spin_unlock(&dev_list_lock);
kref_put(&ns->dev->kref, nvme_free_dev);
put_disk(ns->disk);
kfree(ns);
}
@ -1966,22 +1968,14 @@ static int nvme_open(struct block_device *bdev, fmode_t mode)
ret = -ENXIO;
else if (!kref_get_unless_zero(&ns->kref))
ret = -ENXIO;
else if (!kref_get_unless_zero(&ns->dev->kref)) {
kref_put(&ns->kref, nvme_free_ns);
ret = -ENXIO;
}
spin_unlock(&dev_list_lock);
return ret;
}
static void nvme_free_dev(struct kref *kref);
static void nvme_release(struct gendisk *disk, fmode_t mode)
{
struct nvme_ns *ns = disk->private_data;
struct nvme_dev *dev = ns->dev;
kref_put(&dev->kref, nvme_free_dev);
kref_put(&ns->kref, nvme_free_ns);
}
@ -2179,6 +2173,7 @@ static void nvme_alloc_ns(struct nvme_dev *dev, unsigned nsid)
if (nvme_revalidate_disk(ns->disk))
goto out_free_disk;
kref_get(&dev->kref);
add_disk(ns->disk);
if (ns->ms) {
struct block_device *bd = bdget_disk(ns->disk, 0);
@ -2374,12 +2369,6 @@ static int nvme_setup_io_queues(struct nvme_dev *dev)
return result;
}
static void nvme_free_namespace(struct nvme_ns *ns)
{
list_del(&ns->list);
kref_put(&ns->kref, nvme_free_ns);
}
static int ns_cmp(void *priv, struct list_head *a, struct list_head *b)
{
struct nvme_ns *nsa = container_of(a, struct nvme_ns, list);
@ -2421,7 +2410,9 @@ static void nvme_ns_remove(struct nvme_ns *ns)
if (kill || !blk_queue_dying(ns->queue)) {
blk_mq_abort_requeue_list(ns->queue);
blk_cleanup_queue(ns->queue);
}
}
list_del_init(&ns->list);
kref_put(&ns->kref, nvme_free_ns);
}
static void nvme_scan_namespaces(struct nvme_dev *dev, unsigned nn)
@ -2432,18 +2423,14 @@ static void nvme_scan_namespaces(struct nvme_dev *dev, unsigned nn)
for (i = 1; i <= nn; i++) {
ns = nvme_find_ns(dev, i);
if (ns) {
if (revalidate_disk(ns->disk)) {
if (revalidate_disk(ns->disk))
nvme_ns_remove(ns);
nvme_free_namespace(ns);
}
} else
nvme_alloc_ns(dev, i);
}
list_for_each_entry_safe(ns, next, &dev->namespaces, list) {
if (ns->ns_id > nn) {
if (ns->ns_id > nn)
nvme_ns_remove(ns);
nvme_free_namespace(ns);
}
}
list_sort(NULL, &dev->namespaces, ns_cmp);
}
@ -2833,9 +2820,9 @@ static void nvme_dev_shutdown(struct nvme_dev *dev)
static void nvme_dev_remove(struct nvme_dev *dev)
{
struct nvme_ns *ns;
struct nvme_ns *ns, *next;
list_for_each_entry(ns, &dev->namespaces, list)
list_for_each_entry_safe(ns, next, &dev->namespaces, list)
nvme_ns_remove(ns);
}
@ -2891,21 +2878,12 @@ static void nvme_release_instance(struct nvme_dev *dev)
spin_unlock(&dev_list_lock);
}
static void nvme_free_namespaces(struct nvme_dev *dev)
{
struct nvme_ns *ns, *next;
list_for_each_entry_safe(ns, next, &dev->namespaces, list)
nvme_free_namespace(ns);
}
static void nvme_free_dev(struct kref *kref)
{
struct nvme_dev *dev = container_of(kref, struct nvme_dev, kref);
put_device(dev->dev);
put_device(dev->device);
nvme_free_namespaces(dev);
nvme_release_instance(dev);
if (dev->tagset.tags)
blk_mq_free_tag_set(&dev->tagset);