From c7178e4cddfc2a7ea7af97368ad481c12b8981d5 Mon Sep 17 00:00:00 2001
From: Taylor R Campbell <riastradh@NetBSD.org>
Date: Sat, 15 Jan 2022 19:11:10 +0000
Subject: [PATCH 06/37] disk(9): New function disklabel_dev_unit.
Maps a dev_t like wd3e to an autoconf instance number like 3, with no
partition. Same as DISKUNIT macro, but is a symbol whose pointer can
be taken. Meant for use with struct bdevsw, cdevsw::d_devtounit.
---
sys/kern/subr_disk.c | 7 +++++++
sys/sys/disklabel.h | 1 +
2 files changed, 8 insertions(+)
diff --git a/sys/kern/subr_disk.c b/sys/kern/subr_disk.c
index da664f920382..41218421db57 100644
--- a/sys/kern/subr_disk.c
+++ b/sys/kern/subr_disk.c
@@ -728,3 +728,10 @@ disk_set_info(device_t dev, struct disk *dk, const char *type)
if (odisk_info)
prop_object_release(odisk_info);
}
+
+int
+disklabel_dev_unit(dev_t dev)
+{
+
+ return DISKUNIT(dev);
+}
diff --git a/sys/sys/disklabel.h b/sys/sys/disklabel.h
index 4e94b8671332..853cdbe668a3 100644
--- a/sys/sys/disklabel.h
+++ b/sys/sys/disklabel.h
@@ -509,6 +509,7 @@ const char *convertdisklabel(struct disklabel *, void (*)(struct buf *),
int bounds_check_with_label(struct disk *, struct buf *, int);
int bounds_check_with_mediasize(struct buf *, int, uint64_t);
const char *getfstypename(int);
+int disklabel_dev_unit(dev_t);
#endif
#endif /* _LOCORE */