[dm-devel] [PATCH v3 07/19] nvme: Don't hardcode the data len for pr commands

[Mike Christie]

Reservation Report support needs to pass in a variable sized buffer, so
this patch has the pr command helpers take a data length argument.

Signed-off-by: Mike Christie <michael.christie at oracle.com>
Reviewed-by: Christoph Hellwig <hch at lst.de>
---
 drivers/nvme/host/core.c | 14 ++++++++------
 1 file changed, 8 insertions(+), 6 deletions(-)

diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index dc4220600585..a79fa710d012 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -2082,7 +2082,7 @@ static char nvme_pr_type(enum pr_type type)
 }
 
 static int nvme_send_ns_head_pr_command(struct block_device *bdev,
-		struct nvme_command *c, u8 data[16])
+		struct nvme_command *c, u8 *data, unsigned int data_len)
 {
 	struct nvme_ns_head *head = bdev->bd_disk->private_data;
 	int srcu_idx = srcu_read_lock(&head->srcu);
@@ -2091,17 +2091,17 @@ static int nvme_send_ns_head_pr_command(struct block_device *bdev,
 
 	if (ns) {
 		c->common.nsid = cpu_to_le32(ns->head->ns_id);
-		ret = nvme_submit_sync_cmd(ns->queue, c, data, 16);
+		ret = nvme_submit_sync_cmd(ns->queue, c, data, data_len);
 	}
 	srcu_read_unlock(&head->srcu, srcu_idx);
 	return ret;
 }
 	
 static int nvme_send_ns_pr_command(struct nvme_ns *ns, struct nvme_command *c,
-		u8 data[16])
+		u8 *data, unsigned int data_len)
 {
 	c->common.nsid = cpu_to_le32(ns->head->ns_id);
-	return nvme_submit_sync_cmd(ns->queue, c, data, 16);
+	return nvme_submit_sync_cmd(ns->queue, c, data, data_len);
 }
 
 static int nvme_pr_command(struct block_device *bdev, u32 cdw10,
@@ -2118,8 +2118,10 @@ static int nvme_pr_command(struct block_device *bdev, u32 cdw10,
 
 	if (IS_ENABLED(CONFIG_NVME_MULTIPATH) &&
 	    bdev->bd_disk->fops == &nvme_ns_head_ops)
-		return nvme_send_ns_head_pr_command(bdev, &c, data);
-	return nvme_send_ns_pr_command(bdev->bd_disk->private_data, &c, data);
+		return nvme_send_ns_head_pr_command(bdev, &c, data,
+						    sizeof(data));
+	return nvme_send_ns_pr_command(bdev->bd_disk->private_data, &c, data,
+				       sizeof(data));
 }
 
 static int nvme_pr_register(struct block_device *bdev, u64 old,
-- 
2.25.1