From: Stefan Metzmacher <metze@samba.org>
Date: Tue, 21 Oct 2025 15:52:05 +0000 (+0200)
Subject: smb: smbdirect: introduce smbdirect_mr_io_fill_buffer_descriptor()
X-Git-Tag: v7.1-rc1~128^2~102
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b183b7b9b51fc37cc8e1fbad3c0d84e0cb605266;p=thirdparty%2Fkernel%2Flinux.git

smb: smbdirect: introduce smbdirect_mr_io_fill_buffer_descriptor()

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

Cc: Steve French <smfrench@gmail.com>
Cc: Tom Talpey <tom@talpey.com>
Cc: Long Li <longli@microsoft.com>
Cc: Namjae Jeon <linkinjeon@kernel.org>
Cc: linux-cifs@vger.kernel.org
Cc: samba-technical@lists.samba.org
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Acked-by: Namjae Jeon <linkinjeon@kernel.org>
Signed-off-by: Steve French <stfrench@microsoft.com>
---

diff --git a/fs/smb/common/smbdirect/smbdirect_mr.c b/fs/smb/common/smbdirect/smbdirect_mr.c
index 249719c916a85..d5bf8531e2373 100644
--- a/fs/smb/common/smbdirect/smbdirect_mr.c
+++ b/fs/smb/common/smbdirect/smbdirect_mr.c
@@ -452,6 +452,24 @@ dma_map_error:
 		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