[PATCH 1/2] nvme: add API for sending admin commands by bdev

[Robert Baldyga]

From: Michal Rakowski <michal.rakowski@xxxxxxxxx>

Add kernel API function for sending nvme admin commands.

Signed-off-by: Michal Rakowski <michal.rakowski@xxxxxxxxx>
Signed-off-by: Robert Baldyga <robert.baldyga@xxxxxxxxx>
---
 drivers/nvme/host/core.c | 23 +++++++++++++++++++++++
 include/linux/nvme.h     |  3 +++
 2 files changed, 26 insertions(+)

diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index d3d6b7bd6903..06f917f391c4 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -812,6 +812,29 @@ int nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd,
 }
 EXPORT_SYMBOL_GPL(nvme_submit_sync_cmd);
 
+int nvme_submit_admin_cmd_by_bdev(struct block_device *bdev,
+		struct nvme_command *c, void *buffer, unsigned int bufflen)
+{
+	struct nvme_ns *ns;
+	struct nvme_ctrl *ctrl;
+	int error;
+
+	if (!bdev && !c)
+		return -EINVAL;
+
+	ns = bdev->bd_disk->private_data;
+	ctrl = ns->ctrl;
+
+	error = nvme_submit_sync_cmd(ctrl->admin_q, c, buffer, bufflen);
+	if (error) {
+		dev_warn(ctrl->device, "Admin command failed (%d)\n", error);
+		return error;
+	}
+
+	return error;
+}
+EXPORT_SYMBOL_GPL(nvme_submit_admin_cmd_by_bdev);
+
 static void *nvme_add_user_metadata(struct bio *bio, void __user *ubuf,
 		unsigned len, u32 seed, bool write)
 {
diff --git a/include/linux/nvme.h b/include/linux/nvme.h
index 01aa6a6c241d..6f26c5654514 100644
--- a/include/linux/nvme.h
+++ b/include/linux/nvme.h
@@ -1392,4 +1392,7 @@ struct nvme_completion {
 #define NVME_MINOR(ver)		(((ver) >> 8) & 0xff)
 #define NVME_TERTIARY(ver)	((ver) & 0xff)
 
+int nvme_submit_admin_cmd_by_bdev(struct block_device *bdev,
+		struct nvme_command *c, void *buffer, unsigned int bufflen);
+
 #endif /* _LINUX_NVME_H */
-- 
2.17.1

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