[PATCH 01/13] nvme: add a nvme_ns_head_multipath helper
Christoph Hellwig
hch at lst.de
Thu Apr 8 13:08:30 BST 2021
From: Minwoo Im <minwoo.im.dev at gmail.com>
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 at gmail.com>
[hch: added the IS_ENABLED, converted a few existing users]
Signed-off-by: Christoph Hellwig <hch at lst.de>
---
drivers/nvme/host/core.c | 8 ++------
drivers/nvme/host/nvme.h | 7 ++++++-
2 files changed, 8 insertions(+), 7 deletions(-)
diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index 314705da2c1076..4d13bca83cfefa 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -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:
diff --git a/drivers/nvme/host/nvme.h b/drivers/nvme/host/nvme.h
index 815c032a190eff..67ff5d41e7d03b 100644
--- a/drivers/nvme/host/nvme.h
+++ b/drivers/nvme/host/nvme.h
@@ -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 */
--
2.30.1
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