Use pseudo-device to specify number of precreated devs

* use pseudo-device <dev> <n> in the kernel config to specify
  the number of devices to precreate (<n>) for snp, tun, vn, bpf.

* The full rationale (for vn, snp, bpf and tun) is:
  - if NO pseudo-device foo is specified, 4 devices will be
    precreated.
  - if pseudo-device foo is specified, 4 devices will be
    precreated.
  - if pseudo-device foo N, where N > 1 is specified, N devices
    will be precreated.

diff --git a/sys/dev/disk/vn/vn.c b/sys/dev/disk/vn/vn.c
index d10312d..a751fad 100644 (file)
--- a/sys/dev/disk/vn/vn.c
+++ b/sys/dev/disk/vn/vn.c
@@ -57,6 +57,7 @@
  * NOTE 2: Doesn't interact with leases, should it?
  */
 
+#include "use_vn.h"
 #include <sys/param.h>
 #include <sys/systm.h>
 #include <sys/kernel.h>
@@ -93,7 +94,12 @@ static       d_strategy_t    vnstrategy;
 static d_clone_t       vnclone;
 
 DEVFS_DECLARE_CLONE_BITMAP(vn);
+
+#if NVN <= 1
 #define VN_PREALLOCATED_UNITS  4
+#else
+#define VN_PREALLOCATED_UNITS  NVN
+#endif
 
 #define CDEV_MAJOR 43
 

diff --git a/sys/dev/misc/snp/snp.c b/sys/dev/misc/snp/snp.c
index f33b502..c9e7987 100644 (file)
--- a/sys/dev/misc/snp/snp.c
+++ b/sys/dev/misc/snp/snp.c
@@ -16,6 +16,7 @@
  * $DragonFly: src/sys/dev/misc/snp/snp.c,v 1.19 2007/05/08 02:31:41 dillon Exp $
  */
 
+#include "use_snp.h"
 #include <sys/param.h>
 #include <sys/systm.h>
 #include <sys/filio.h>
@@ -41,7 +42,12 @@ static       d_ioctl_t       snpioctl;
 static d_poll_t        snppoll;
 static d_clone_t       snpclone;
 DEVFS_DECLARE_CLONE_BITMAP(snp);
+
+#if NSNP <= 1
 #define SNP_PREALLOCATED_UNITS 4
+#else
+#define SNP_PREALLOCATED_UNITS NSNP
+#endif
 
 #define CDEV_MAJOR 53
 static struct dev_ops snp_ops = {

diff --git a/sys/net/bpf.c b/sys/net/bpf.c
index 97cad23..b85999b 100644 (file)
--- a/sys/net/bpf.c
+++ b/sys/net/bpf.c
@@ -85,7 +85,12 @@ struct netmsg_bpf_output {
 
 MALLOC_DEFINE(M_BPF, "BPF", "BPF data");
 DEVFS_DECLARE_CLONE_BITMAP(bpf);
+
+#if NBPF <= 1
 #define BPF_PREALLOCATED_UNITS 4
+#else
+#define BPF_PREALLOCATED_UNITS NBPF
+#endif
 
 #if NBPF > 0
 

diff --git a/sys/net/tun/if_tun.c b/sys/net/tun/if_tun.c
index e7d6b78..91d55c0 100644 (file)
--- a/sys/net/tun/if_tun.c
+++ b/sys/net/tun/if_tun.c
@@ -17,6 +17,7 @@
  * $DragonFly: src/sys/net/tun/if_tun.c,v 1.37 2008/06/05 18:06:32 swildner Exp $
  */
 
+#include "use_tun.h"
 #include "opt_atalk.h"
 #include "opt_inet.h"
 #include "opt_inet6.h"
@@ -85,7 +86,12 @@ static       d_poll_t        tunpoll;
 
 static d_clone_t tunclone;
 DEVFS_DECLARE_CLONE_BITMAP(tun);
+
+#if NTUN <= 1
 #define TUN_PREALLOCATED_UNITS 4
+#else
+#define TUN_PREALLOCATED_UNITS NTUN
+#endif
 
 #define CDEV_MAJOR 52
 static struct dev_ops tun_ops = {