From 3c17de6a840b2903d963f997ee65e55f55c5c75a Mon Sep 17 00:00:00 2001
From: Sebastien Buisson <sbuisson@ddn.com>
Date: Wed, 20 Mar 2024 09:20:52 +0100
Subject: [PATCH] LU-17431 mdt: add ioctl handler for mds

Adding ioctl handler for mds allows managing dynamic nodemaps
on MDS side.

Test-Parameters: trivial
Signed-off-by: Sebastien Buisson <sbuisson@ddn.com>
Change-Id: I6a68a17d3f12c799238a93242bbd385e6eeb1d0b
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/54504
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: James Simmons <jsimmons@infradead.org>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>
---
 lustre/mdt/mdt_mds.c | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)

diff --git a/lustre/mdt/mdt_mds.c b/lustre/mdt/mdt_mds.c
index e94fed6..3e58bed 100644
--- a/lustre/mdt/mdt_mds.c
+++ b/lustre/mdt/mdt_mds.c
@@ -52,6 +52,7 @@
 #include "mdt_internal.h"
 #include <lustre_quota.h>
 #include <lustre_acl.h>
+#include <lustre_nodemap.h>
 #include <uapi/linux/lustre/lustre_param.h>
 
 struct mds_device {
@@ -656,9 +657,35 @@ static int mds_health_check(const struct lu_env *env, struct obd_device *obd)
 	return rc != 0 ? 1 : 0;
 }
 
+/* ioctls on obd dev */
+static int mds_iocontrol(unsigned int cmd, struct obd_export *exp, int len,
+			 void *karg, void __user *uarg)
+{
+	struct obd_device *obd = exp->exp_obd;
+	struct obd_ioctl_data *data;
+	int rc = 0;
+
+	ENTRY;
+	CDEBUG(D_IOCTL, "%s: cmd=%x len=%u karg=%pK uarg=%pK\n",
+	       obd->obd_name, cmd, len, karg, uarg);
+
+	data = karg;
+	/* we only support nodemap ioctls, for now */
+	if (cmd != OBD_IOC_NODEMAP)
+		GOTO(out, rc = -EINVAL);
+
+	rc = server_iocontrol_nodemap(obd, data, true);
+	if (rc)
+		GOTO(out, rc);
+
+out:
+	RETURN(rc);
+}
+
 static const struct obd_ops mds_obd_device_ops = {
 	.o_owner	   = THIS_MODULE,
 	.o_health_check	   = mds_health_check,
+	.o_iocontrol	   = mds_iocontrol,
 };
 
 int mds_mod_init(void)
-- 
1.8.3.1