[PATCH v4 047/145] smb: smbdirect: introduce smbdirect_mr_io_fill_buffer_descriptor()

[Stefan Metzmacher]

This will be used by the client instead of dereferencing
struct smbdirect_mr_io internals.

Cc: Steve French <smfrench at gmail.com>
Cc: Tom Talpey <tom at talpey.com>
Cc: Long Li <longli at microsoft.com>
Cc: Namjae Jeon <linkinjeon at kernel.org>
Cc: linux-cifs at vger.kernel.org
Cc: samba-technical at lists.samba.org
Signed-off-by: Stefan Metzmacher <metze at samba.org>
Signed-off-by: Steve French <stfrench at microsoft.com>
---
 fs/smb/common/smbdirect/smbdirect_mr.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/fs/smb/common/smbdirect/smbdirect_mr.c b/fs/smb/common/smbdirect/smbdirect_mr.c
index 35dc2a6c9b89..3c2f653f70e8 100644
--- a/fs/smb/common/smbdirect/smbdirect_mr.c
+++ b/fs/smb/common/smbdirect/smbdirect_mr.c
@@ -452,6 +452,24 @@ smbdirect_connection_register_mr_io(struct smbdirect_socket *sc,
 		mutex_unlock(&mr->mutex);
 	return NULL;
 }
+
+__maybe_unused /* this is temporary while this file is included in others */
+static void smbdirect_mr_io_fill_buffer_descriptor(struct smbdirect_mr_io *mr,
+						   struct smbdirect_buffer_descriptor_v1 *v1)
+{
+	mutex_lock(&mr->mutex);
+	if (mr->state == SMBDIRECT_MR_REGISTERED) {
+		v1->offset = cpu_to_le64(mr->mr->iova);
+		v1->token = cpu_to_le32(mr->mr->rkey);
+		v1->length = cpu_to_le32(mr->mr->length);
+	} else {
+		v1->offset = cpu_to_le64(U64_MAX);
+		v1->token = cpu_to_le32(U32_MAX);
+		v1->length = cpu_to_le32(U32_MAX);
+	}
+	mutex_unlock(&mr->mutex);
+}
+
 /*
  * Deregister a MR after I/O is done
  * This function may wait if remote invalidation is not used
-- 
2.43.0