Don't enforce unique device minor number policy anymore.

Except for the case where we use the cloner library (clone_create() and
friends), there is no reason to enforce a unique device minor number
policy. There are various drivers in the source tree that allocate unr
pools and such to provide minor numbers, without using them themselves.

Because we still need to support unique device minor numbers for the
cloner library, introduce a new flag called D_NEEDMINOR. All cdevsw's
that are used in combination with the cloner library should be marked
with this flag to make the cloning work.

This means drivers can now freely use si_drv0 to store their own flags
and state, making it effectively the same as si_drv1 and si_drv2. We
still keep the minor() and dev2unit() routines around to make drivers
happy.

The NTFS code also used the minor number in its hash table. We should
not do this anymore. If the si_drv0 field would be changed, it would no
longer end up in the same list.

Approved by:	philip (mentor)

3 files changed, 3 insertions, 3 deletions

diff --git a/sys/dev/nmdm/nmdm.c b/sys/dev/nmdm/nmdm.c
index 110553a..8536c18 100644
--- a/sys/dev/nmdm/nmdm.c
+++ b/sys/dev/nmdm/nmdm.c
@@ -68,7 +68,7 @@ static struct cdevsw nmdm_cdevsw = {
 	.d_open =	nmdmopen,
 	.d_close =	nmdmclose,
 	.d_name =	"nmdn",
-	.d_flags =	D_TTY | D_PSEUDO | D_NEEDGIANT,
+	.d_flags =	D_TTY | D_PSEUDO | D_NEEDGIANT | D_NEEDMINOR,
 };
 
 #define BUFSIZ 		100		/* Chunk size iomoved to/from user */
diff --git a/sys/dev/snp/snp.c b/sys/dev/snp/snp.c
index 845ef31..3b52e48 100644
--- a/sys/dev/snp/snp.c
+++ b/sys/dev/snp/snp.c
@@ -44,7 +44,7 @@ static	d_poll_t	snppoll;
 
 static struct cdevsw snp_cdevsw = {
 	.d_version =	D_VERSION,
-	.d_flags =	D_PSEUDO | D_NEEDGIANT,
+	.d_flags =	D_PSEUDO | D_NEEDGIANT | D_NEEDMINOR,
 	.d_open =	snpopen,
 	.d_close =	snpclose,
 	.d_read =	snpread,
diff --git a/sys/dev/vkbd/vkbd.c b/sys/dev/vkbd/vkbd.c
index 9807036..10e3516 100644
--- a/sys/dev/vkbd/vkbd.c
+++ b/sys/dev/vkbd/vkbd.c
@@ -158,7 +158,7 @@ static int		vkbd_data_read(vkbd_state_t *, int);
 
 static struct cdevsw	vkbd_dev_cdevsw = {
 	.d_version =	D_VERSION,
-	.d_flags =	D_PSEUDO | D_NEEDGIANT,
+	.d_flags =	D_PSEUDO | D_NEEDGIANT | D_NEEDMINOR,
 	.d_open =	vkbd_dev_open,
 	.d_close =	vkbd_dev_close,
 	.d_read =	vkbd_dev_read,