LU-12506 changelog: support large number of MDT

[fs/lustre-release.git] / lustre / mdc / mdc_request.c

diff --git a/lustre/mdc/mdc_request.c b/lustre/mdc/mdc_request.c
index 6c7163f..750ed3d 100644 (file)
--- a/lustre/mdc/mdc_request.c
+++ b/lustre/mdc/mdc_request.c
@@ -40,6 +40,7 @@
 #include <linux/utsname.h>
 #include <linux/delay.h>
 #include <linux/uidgid.h>
+#include <linux/device.h>
 
 #include <lustre_errno.h>
 
@@ -2957,15 +2958,40 @@ static const struct md_ops mdc_md_ops = {
        .m_rmfid                = mdc_rmfid,
 };
 
+dev_t mdc_changelog_dev;
+struct class *mdc_changelog_class;
 static int __init mdc_init(void)
 {
-       return class_register_type(&mdc_obd_ops, &mdc_md_ops, true, NULL,
-                                  LUSTRE_MDC_NAME, &mdc_device_type);
+       int rc = 0;
+       rc = alloc_chrdev_region(&mdc_changelog_dev, 0,
+                                MDC_CHANGELOG_DEV_COUNT,
+                                MDC_CHANGELOG_DEV_NAME);
+       if (rc)
+               return rc;
+
+       mdc_changelog_class = class_create(THIS_MODULE, MDC_CHANGELOG_DEV_NAME);
+       if (IS_ERR(mdc_changelog_class)) {
+               rc = PTR_ERR(mdc_changelog_class);
+               goto out_dev;
+       }
+
+       rc = class_register_type(&mdc_obd_ops, &mdc_md_ops, true, NULL,
+                                LUSTRE_MDC_NAME, &mdc_device_type);
+       if (rc)
+               goto out_dev;
+
+       return 0;
+
+out_dev:
+       unregister_chrdev_region(mdc_changelog_dev, MDC_CHANGELOG_DEV_COUNT);
+       return rc;
 }
 
 static void __exit mdc_exit(void)
 {
-        class_unregister_type(LUSTRE_MDC_NAME);
+       class_destroy(mdc_changelog_class);
+       unregister_chrdev_region(mdc_changelog_dev, MDC_CHANGELOG_DEV_COUNT);
+       class_unregister_type(LUSTRE_MDC_NAME);
 }
 
 MODULE_AUTHOR("OpenSFS, Inc. <http://www.lustre.org/>");