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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.
This commit is contained in:
riastradh 2022-03-28 12:33:59 +00:00
parent fc76cc25dd
commit 89d7388021
2 changed files with 11 additions and 3 deletions
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11
sys/kern/subr_disk.c
View File

@ -1,4 +1,4 @@
/* $NetBSD: subr_disk.c,v 1.133 2021/05/17 08:50:36 mrg Exp $ */
/* $NetBSD: subr_disk.c,v 1.134 2022/03/28 12:33:59 riastradh Exp $ */
/*-
* Copyright (c) 1996, 1997, 1999, 2000, 2009 The NetBSD Foundation, Inc.
@ -67,7 +67,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: subr_disk.c,v 1.133 2021/05/17 08:50:36 mrg Exp $");
__KERNEL_RCSID(0, "$NetBSD: subr_disk.c,v 1.134 2022/03/28 12:33:59 riastradh Exp $");
#include <sys/param.h>
#include <sys/kernel.h>
@ -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);
}

3
sys/sys/disklabel.h
View File

@ -1,4 +1,4 @@
/* $NetBSD: disklabel.h,v 1.125 2021/05/17 08:50:36 mrg Exp $ */
/* $NetBSD: disklabel.h,v 1.126 2022/03/28 12:33:59 riastradh Exp $ */
/*
* Copyright (c) 1987, 1988, 1993
@ -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 */