[PATCH 2/2] nvme: add API for getting nsid by bdev

[Robert Baldyga <robert.baldyga@intel.com>]

Add kernel API function for getting nvme namespace id.

Signed-off-by: Robert Baldyga <robert.baldyga@intel.com>
---
 drivers/nvme/host/core.c | 14 ++++++++++++++
 include/linux/nvme.h     |  2 ++
 2 files changed, 16 insertions(+)

diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index 06f917f391c4..35d121cd2378 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -812,6 +812,20 @@ int nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd,
 }
 EXPORT_SYMBOL_GPL(nvme_submit_sync_cmd);
 
+int nvme_get_nsid_by_bdev(struct block_device *bdev, unsigned int *nsid)
+{
+	struct nvme_ns *ns;
+
+	if (!bdev && !nsid)
+		return -EINVAL;
+
+	ns = bdev->bd_disk->private_data;
+	*nsid = ns->head->ns_id;
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(nvme_nsid_by_bdev);
+
 int nvme_submit_admin_cmd_by_bdev(struct block_device *bdev,
 		struct nvme_command *c, void *buffer, unsigned int bufflen)
 {
diff --git a/include/linux/nvme.h b/include/linux/nvme.h
index 6f26c5654514..c54e210ad271 100644
--- a/include/linux/nvme.h
+++ b/include/linux/nvme.h
@@ -1392,6 +1392,8 @@ struct nvme_completion {
 #define NVME_MINOR(ver)		(((ver) >> 8) & 0xff)
 #define NVME_TERTIARY(ver)	((ver) & 0xff)
 
+int nvme_get_nsid_by_bdev(struct block_device *bdev, unsigned int *nsid);
+
 int nvme_submit_admin_cmd_by_bdev(struct block_device *bdev,
 		struct nvme_command *c, void *buffer, unsigned int bufflen);
 
-- 
2.17.1

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