[PATCH 8/8] nvme-fabrics: allow to pass in keyring by name

[Hannes Reinecke <hare@kernel.org>]

The current interface of passing in keyrings by serial number is very
impractical for configuration scripts, as the serial number is not
persistent across reboots, and so any configuration files will need
to be adjusted.
This patchs allows to specify the TLS keyring by name in addition to
the serial number to simplify configuration file handling.

Signed-off-by: Hannes Reinecke <hare@kernel.org>
---
 drivers/nvme/host/fabrics.c | 25 ++++++++++++++++++-------
 1 file changed, 18 insertions(+), 7 deletions(-)

diff --git a/drivers/nvme/host/fabrics.c b/drivers/nvme/host/fabrics.c
index 84bd2d7718db..a187acc4d3de 100644
--- a/drivers/nvme/host/fabrics.c
+++ b/drivers/nvme/host/fabrics.c
@@ -14,6 +14,7 @@
 #include "fabrics.h"
 #include <linux/nvme-auth.h>
 #include <linux/nvme-keyring.h>
+#include <linux/key-type.h>
 
 static LIST_HEAD(nvmf_transports);
 static DECLARE_RWSEM(nvmf_transports_rwsem);
@@ -999,13 +1000,23 @@ static int nvmf_parse_options(struct nvmf_ctrl_options *opts,
 			break;
 		case NVMF_OPT_KEYRING:
 			if (match_int(args, &key_id) || key_id <= 0) {
-				ret = -EINVAL;
-				goto out;
-			}
-			key = nvmf_parse_key(key_id);
-			if (IS_ERR(key)) {
-				ret = PTR_ERR(key);
-				goto out;
+				p = match_strdup(args);
+				if (!p) {
+					ret = -ENOMEM;
+					goto out;
+				}
+				key = request_key(&key_type_keyring, p, NULL);
+				kfree(p);
+				if (IS_ERR(key)) {
+					ret = PTR_ERR(key);
+					goto out;
+				}
+			} else {
+				key = nvmf_parse_key(key_id);
+				if (IS_ERR(key)) {
+					ret = PTR_ERR(key);
+					goto out;
+				}
 			}
 			key_put(opts->keyring);
 			opts->keyring = key;
-- 
2.43.0