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nvme: add a nvme_ns_head_multipath helper 

Move the multipath gendisk out of #ifdef CONFIG_NVME_MULTIPATH and add
a new nvme_ns_head_multipath that uses it to check if a ns_head has
a multipath device associated with it.

Signed-off-by: Minwoo Im <minwoo.im.dev@gmail.com>
[hch: added the IS_ENABLED, converted a few existing users]
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Keith Busch <kbusch@kernel.org>
Reviewed-by: Javier González <javier.gonz@samsung.com>
Reviewed-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
This commit is contained in:
Minwoo Im 2021-04-07 17:49:29 +02:00 committed by Christoph Hellwig
parent 95d54bd1a4
commit 3089738868
2 changed files with 8 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
drivers/nvme/host/core.c
View File

@ -1873,11 +1873,9 @@ static int nvme_open(struct block_device *bdev, fmode_t mode)
{
struct nvme_ns *ns = bdev->bd_disk->private_data;
#ifdef CONFIG_NVME_MULTIPATH
/* should never be called due to GENHD_FL_HIDDEN */
if (WARN_ON_ONCE(ns->head->disk))
if (WARN_ON_ONCE(nvme_ns_head_multipath(ns->head)))
goto fail;
#endif
if (!kref_get_unless_zero(&ns->kref))
goto fail;
if (!try_module_get(ns->ctrl->ops->module))
@ -2215,8 +2213,7 @@ static int nvme_update_ns_info(struct nvme_ns *ns, struct nvme_id_ns *id)
return ret;
}
#ifdef CONFIG_NVME_MULTIPATH
if (ns->head->disk) {
if (nvme_ns_head_multipath(ns->head)) {
blk_mq_freeze_queue(ns->head->disk->queue);
nvme_update_disk_info(ns->head->disk, ns, id);
blk_stack_limits(&ns->head->disk->queue->limits,
@ -2224,7 +2221,6 @@ static int nvme_update_ns_info(struct nvme_ns *ns, struct nvme_id_ns *id)
blk_queue_update_readahead(ns->head->disk->queue);
blk_mq_unfreeze_queue(ns->head->disk->queue);
}
#endif
return 0;
out_unfreeze:

7
drivers/nvme/host/nvme.h
View File

@ -413,8 +413,8 @@ struct nvme_ns_head {
bool shared;
int instance;
struct nvme_effects_log *effects;
#ifdef CONFIG_NVME_MULTIPATH
struct gendisk *disk;
#ifdef CONFIG_NVME_MULTIPATH
struct bio_list requeue_list;
spinlock_t requeue_lock;
struct work_struct requeue_work;
@ -425,6 +425,11 @@ struct nvme_ns_head {
#endif
};
static inline bool nvme_ns_head_multipath(struct nvme_ns_head *head)
{
return IS_ENABLED(CONFIG_NVME_MULTIPATH) && head->disk;
}
enum nvme_ns_features {
NVME_NS_EXT_LBAS = 1 << 0, /* support extended LBA format */
NVME_NS_METADATA_SUPPORTED = 1 << 1, /* support getting generated md */