423 lines
8.7 KiB
C
423 lines
8.7 KiB
C
/*-
|
|
* Parts Copyright (c) 1995 Terrence R. Lambert
|
|
* Copyright (c) 1995 Julian R. Elischer
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by Terrence R. Lambert.
|
|
* 4. The name Terrence R. Lambert may not be used to endorse or promote
|
|
* products derived from this software without specific prior written
|
|
* permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY Julian R. Elischer ``AS IS'' AND ANY
|
|
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE TERRENCE R. LAMBERT BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/sysctl.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/module.h>
|
|
#include <sys/malloc.h>
|
|
#include <sys/conf.h>
|
|
#include <sys/vnode.h>
|
|
#include <sys/queue.h>
|
|
#include <sys/ctype.h>
|
|
#include <machine/stdarg.h>
|
|
|
|
#define cdevsw_ALLOCSTART (NUMCDEVSW/2)
|
|
|
|
struct cdevsw *cdevsw[NUMCDEVSW];
|
|
|
|
static MALLOC_DEFINE(M_DEVT, "dev_t", "dev_t storage");
|
|
|
|
/*
|
|
* This is the number of hash-buckets. Experiements with 'real-life'
|
|
* udev_t's show that a prime halfway between two powers of two works
|
|
* best.
|
|
*/
|
|
#define DEVT_HASH 83
|
|
|
|
/* The number of dev_t's we can create before malloc(9) kick in. */
|
|
#define DEVT_STASH 50
|
|
|
|
static struct specinfo devt_stash[DEVT_STASH];
|
|
|
|
static LIST_HEAD(, specinfo) dev_hash[DEVT_HASH];
|
|
|
|
static LIST_HEAD(, specinfo) dev_free;
|
|
|
|
devfs_create_t *devfs_create_hook;
|
|
devfs_destroy_t *devfs_destroy_hook;
|
|
int devfs_present;
|
|
|
|
static int free_devt;
|
|
SYSCTL_INT(_debug, OID_AUTO, free_devt, CTLFLAG_RW, &free_devt, 0, "");
|
|
|
|
struct cdevsw *
|
|
devsw(dev_t dev)
|
|
{
|
|
if (dev->si_devsw)
|
|
return (dev->si_devsw);
|
|
return(cdevsw[major(dev)]);
|
|
}
|
|
|
|
/*
|
|
* Add a cdevsw entry
|
|
*/
|
|
|
|
int
|
|
cdevsw_add(struct cdevsw *newentry)
|
|
{
|
|
|
|
if (newentry->d_maj < 0 || newentry->d_maj >= NUMCDEVSW) {
|
|
printf("%s: ERROR: driver has bogus cdevsw->d_maj = %d\n",
|
|
newentry->d_name, newentry->d_maj);
|
|
return (EINVAL);
|
|
}
|
|
|
|
if (cdevsw[newentry->d_maj]) {
|
|
printf("WARNING: \"%s\" is usurping \"%s\"'s cdevsw[]\n",
|
|
newentry->d_name, cdevsw[newentry->d_maj]->d_name);
|
|
}
|
|
|
|
cdevsw[newentry->d_maj] = newentry;
|
|
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Remove a cdevsw entry
|
|
*/
|
|
|
|
int
|
|
cdevsw_remove(struct cdevsw *oldentry)
|
|
{
|
|
if (oldentry->d_maj < 0 || oldentry->d_maj >= NUMCDEVSW) {
|
|
printf("%s: ERROR: driver has bogus cdevsw->d_maj = %d\n",
|
|
oldentry->d_name, oldentry->d_maj);
|
|
return EINVAL;
|
|
}
|
|
|
|
cdevsw[oldentry->d_maj] = NULL;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* dev_t and u_dev_t primitives
|
|
*/
|
|
|
|
int
|
|
major(dev_t x)
|
|
{
|
|
if (x == NODEV)
|
|
return NOUDEV;
|
|
return((x->si_udev >> 8) & 0xff);
|
|
}
|
|
|
|
int
|
|
minor(dev_t x)
|
|
{
|
|
if (x == NODEV)
|
|
return NOUDEV;
|
|
return(x->si_udev & 0xffff00ff);
|
|
}
|
|
|
|
int
|
|
dev2unit(dev_t x)
|
|
{
|
|
int i;
|
|
|
|
if (x == NODEV)
|
|
return NOUDEV;
|
|
i = minor(x);
|
|
return ((i & 0xff) | (i >> 8));
|
|
}
|
|
|
|
int
|
|
unit2minor(int unit)
|
|
{
|
|
|
|
KASSERT(unit <= 0xffffff, ("Invalid unit (%d) in unit2minor", unit));
|
|
return ((unit & 0xff) | ((unit << 8) & ~0xffff));
|
|
}
|
|
|
|
static dev_t
|
|
allocdev(void)
|
|
{
|
|
static int stashed;
|
|
struct specinfo *si;
|
|
|
|
if (stashed >= DEVT_STASH) {
|
|
MALLOC(si, struct specinfo *, sizeof(*si), M_DEVT,
|
|
M_USE_RESERVE | M_ZERO);
|
|
} else if (LIST_FIRST(&dev_free)) {
|
|
si = LIST_FIRST(&dev_free);
|
|
LIST_REMOVE(si, si_hash);
|
|
} else {
|
|
si = devt_stash + stashed++;
|
|
si->si_flags |= SI_STASHED;
|
|
}
|
|
LIST_INIT(&si->si_names);
|
|
TAILQ_INIT(&si->si_snapshots);
|
|
return (si);
|
|
}
|
|
|
|
dev_t
|
|
makedev(int x, int y)
|
|
{
|
|
struct specinfo *si;
|
|
udev_t udev;
|
|
int hash;
|
|
|
|
if (x == umajor(NOUDEV) && y == uminor(NOUDEV))
|
|
panic("makedev of NOUDEV");
|
|
udev = (x << 8) | y;
|
|
hash = udev % DEVT_HASH;
|
|
LIST_FOREACH(si, &dev_hash[hash], si_hash) {
|
|
if (si->si_udev == udev)
|
|
return (si);
|
|
}
|
|
si = allocdev();
|
|
si->si_udev = udev;
|
|
LIST_INSERT_HEAD(&dev_hash[hash], si, si_hash);
|
|
return (si);
|
|
}
|
|
|
|
void
|
|
freedev(dev_t dev)
|
|
{
|
|
dev_t adev;
|
|
|
|
if (!free_devt)
|
|
return;
|
|
if (SLIST_FIRST(&dev->si_hlist))
|
|
return;
|
|
if (dev->si_devsw || dev->si_drv1 || dev->si_drv2)
|
|
return;
|
|
while (!LIST_EMPTY(&dev->si_names)) {
|
|
adev = LIST_FIRST(&dev->si_names);
|
|
adev->si_drv1 = NULL;
|
|
freedev(adev);
|
|
}
|
|
LIST_REMOVE(dev, si_hash);
|
|
if (dev->si_flags & SI_STASHED) {
|
|
bzero(dev, sizeof(*dev));
|
|
LIST_INSERT_HEAD(&dev_free, dev, si_hash);
|
|
} else {
|
|
FREE(dev, M_DEVT);
|
|
}
|
|
}
|
|
|
|
udev_t
|
|
dev2udev(dev_t x)
|
|
{
|
|
if (x == NODEV)
|
|
return NOUDEV;
|
|
return (x->si_udev);
|
|
}
|
|
|
|
dev_t
|
|
udev2dev(udev_t x, int b)
|
|
{
|
|
|
|
if (x == NOUDEV)
|
|
return (NODEV);
|
|
switch (b) {
|
|
case 0:
|
|
return makedev(umajor(x), uminor(x));
|
|
case 1:
|
|
return (NODEV);
|
|
default:
|
|
Debugger("udev2dev(...,X)");
|
|
return NODEV;
|
|
}
|
|
}
|
|
|
|
int
|
|
uminor(udev_t dev)
|
|
{
|
|
return(dev & 0xffff00ff);
|
|
}
|
|
|
|
int
|
|
umajor(udev_t dev)
|
|
{
|
|
return((dev & 0xff00) >> 8);
|
|
}
|
|
|
|
udev_t
|
|
makeudev(int x, int y)
|
|
{
|
|
return ((x << 8) | y);
|
|
}
|
|
|
|
dev_t
|
|
make_dev(struct cdevsw *devsw, int minor, uid_t uid, gid_t gid, int perms, char *fmt, ...)
|
|
{
|
|
dev_t dev;
|
|
va_list ap;
|
|
int i;
|
|
|
|
KASSERT(umajor(makeudev(devsw->d_maj, minor)) == devsw->d_maj,
|
|
("Invalid minor (%d) in make_dev", minor));
|
|
|
|
dev = makedev(devsw->d_maj, minor);
|
|
if (dev->si_flags & SI_NAMED) {
|
|
printf( "WARNING: Driver mistake: repeat make_dev(\"%s\")\n",
|
|
dev->si_name);
|
|
return (dev);
|
|
}
|
|
va_start(ap, fmt);
|
|
i = kvprintf(fmt, NULL, dev->si_name, 32, ap);
|
|
dev->si_name[i] = '\0';
|
|
va_end(ap);
|
|
dev->si_devsw = devsw;
|
|
dev->si_uid = uid;
|
|
dev->si_gid = gid;
|
|
dev->si_mode = perms;
|
|
dev->si_flags |= SI_NAMED;
|
|
|
|
if (devfs_create_hook)
|
|
devfs_create_hook(dev);
|
|
return (dev);
|
|
}
|
|
|
|
dev_t
|
|
make_dev_alias(dev_t pdev, char *fmt, ...)
|
|
{
|
|
dev_t dev;
|
|
va_list ap;
|
|
int i;
|
|
|
|
dev = allocdev();
|
|
dev->si_flags |= SI_ALIAS;
|
|
dev->si_flags |= SI_NAMED;
|
|
dev->si_drv1 = pdev;
|
|
LIST_INSERT_HEAD(&pdev->si_names, dev, si_hash);
|
|
|
|
va_start(ap, fmt);
|
|
i = kvprintf(fmt, NULL, dev->si_name, 32, ap);
|
|
dev->si_name[i] = '\0';
|
|
va_end(ap);
|
|
|
|
if (devfs_create_hook)
|
|
devfs_create_hook(dev);
|
|
return (dev);
|
|
}
|
|
|
|
void
|
|
destroy_dev(dev_t dev)
|
|
{
|
|
|
|
if (!(dev->si_flags & SI_NAMED)) {
|
|
printf( "WARNING: Driver mistake: destroy_dev on %d/%d\n",
|
|
major(dev), minor(dev));
|
|
return;
|
|
}
|
|
|
|
if (devfs_destroy_hook)
|
|
devfs_destroy_hook(dev);
|
|
dev->si_drv1 = 0;
|
|
dev->si_drv2 = 0;
|
|
dev->si_devsw = 0;
|
|
dev->si_flags &= ~SI_NAMED;
|
|
dev->si_flags &= ~SI_ALIAS;
|
|
freedev(dev);
|
|
}
|
|
|
|
const char *
|
|
devtoname(dev_t dev)
|
|
{
|
|
char *p;
|
|
int mynor;
|
|
|
|
if (dev->si_name[0] == '#' || dev->si_name[0] == '\0') {
|
|
p = dev->si_name;
|
|
if (devsw(dev))
|
|
sprintf(p, "#%s/", devsw(dev)->d_name);
|
|
else
|
|
sprintf(p, "#%d/", major(dev));
|
|
p += strlen(p);
|
|
mynor = minor(dev);
|
|
if (mynor < 0 || mynor > 255)
|
|
sprintf(p, "%#x", (u_int)mynor);
|
|
else
|
|
sprintf(p, "%d", mynor);
|
|
}
|
|
return (dev->si_name);
|
|
}
|
|
|
|
int
|
|
dev_stdclone(char *name, char **namep, char *stem, int *unit)
|
|
{
|
|
int u, i;
|
|
|
|
i = strlen(stem);
|
|
if (bcmp(stem, name, i) != 0)
|
|
return (0);
|
|
if (!isdigit(name[i]))
|
|
return (0);
|
|
u = 0;
|
|
while (isdigit(name[i])) {
|
|
u *= 10;
|
|
u += name[i++] - '0';
|
|
}
|
|
*unit = u;
|
|
if (namep)
|
|
*namep = &name[i];
|
|
if (name[i])
|
|
return (2);
|
|
return (1);
|
|
}
|
|
|
|
/*
|
|
* Helper sysctl for devname(3). We're given a {u}dev_t and return
|
|
* the name, if any, registered by the device driver.
|
|
*/
|
|
static int
|
|
sysctl_devname(SYSCTL_HANDLER_ARGS)
|
|
{
|
|
int error;
|
|
udev_t ud;
|
|
dev_t dev;
|
|
|
|
error = SYSCTL_IN(req, &ud, sizeof (ud));
|
|
if (error)
|
|
return (error);
|
|
if (ud == NOUDEV)
|
|
return(EINVAL);
|
|
dev = makedev(umajor(ud), uminor(ud));
|
|
if (dev->si_name[0] == '\0')
|
|
error = ENOENT;
|
|
else
|
|
error = SYSCTL_OUT(req, dev->si_name, strlen(dev->si_name) + 1);
|
|
freedev(dev);
|
|
return (error);
|
|
}
|
|
|
|
SYSCTL_PROC(_kern, OID_AUTO, devname, CTLTYPE_OPAQUE|CTLFLAG_RW|CTLFLAG_ANYBODY,
|
|
NULL, 0, sysctl_devname, "", "devname(3) handler");
|
|
|