1995-10-02 09:24:44 +00:00
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/*-
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2002-09-20 22:26:27 +00:00
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* Copyright (c) 1999-2002 Poul-Henning Kamp
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1995-10-02 09:24:44 +00:00
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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2002-09-20 22:26:27 +00:00
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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1995-10-02 09:24:44 +00:00
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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2002-09-20 22:26:27 +00:00
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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1995-10-02 09:24:44 +00:00
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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2003-06-11 00:56:59 +00:00
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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1995-10-02 09:24:44 +00:00
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#include <sys/param.h>
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1999-07-20 09:47:55 +00:00
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#include <sys/kernel.h>
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1995-10-02 10:15:40 +00:00
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#include <sys/systm.h>
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2003-02-20 15:35:54 +00:00
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#include <sys/bio.h>
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2002-02-16 17:44:43 +00:00
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#include <sys/lock.h>
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#include <sys/mutex.h>
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2001-09-12 08:38:13 +00:00
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#include <sys/sysctl.h>
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1998-06-07 17:13:14 +00:00
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#include <sys/module.h>
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1999-07-20 09:47:55 +00:00
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#include <sys/malloc.h>
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1995-10-02 09:24:44 +00:00
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#include <sys/conf.h>
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1995-12-21 20:09:46 +00:00
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#include <sys/vnode.h>
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1999-07-20 09:47:55 +00:00
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#include <sys/queue.h>
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2003-09-27 12:53:33 +00:00
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#include <sys/poll.h>
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2000-09-02 19:17:34 +00:00
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#include <sys/ctype.h>
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1999-08-08 18:43:05 +00:00
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#include <machine/stdarg.h>
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1995-12-21 20:09:46 +00:00
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2000-12-08 20:09:00 +00:00
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static MALLOC_DEFINE(M_DEVT, "dev_t", "dev_t storage");
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1999-07-20 09:47:55 +00:00
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2003-02-27 14:46:51 +00:00
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/* Built at compile time from sys/conf/majors */
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extern unsigned char reserved_majors[256];
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1999-08-28 19:21:36 +00:00
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/*
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* This is the number of hash-buckets. Experiements with 'real-life'
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* udev_t's show that a prime halfway between two powers of two works
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* best.
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*/
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1999-07-20 09:47:55 +00:00
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#define DEVT_HASH 83
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1999-08-28 19:21:36 +00:00
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/* The number of dev_t's we can create before malloc(9) kick in. */
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1999-07-20 09:47:55 +00:00
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#define DEVT_STASH 50
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2002-09-27 18:27:10 +00:00
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static struct cdev devt_stash[DEVT_STASH];
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1999-07-20 09:47:55 +00:00
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2002-09-27 18:27:10 +00:00
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static LIST_HEAD(, cdev) dev_hash[DEVT_HASH];
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1999-08-29 09:09:12 +00:00
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2002-09-27 18:27:10 +00:00
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static LIST_HEAD(, cdev) dev_free;
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1999-05-07 10:11:40 +00:00
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1999-08-29 09:09:12 +00:00
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static int free_devt;
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SYSCTL_INT(_debug, OID_AUTO, free_devt, CTLFLAG_RW, &free_devt, 0, "");
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1999-08-23 20:59:21 +00:00
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2003-09-27 12:53:33 +00:00
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int
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nullop(void)
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{
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return (0);
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}
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int
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eopnotsupp(void)
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{
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return (EOPNOTSUPP);
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}
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2003-02-20 15:35:54 +00:00
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static int
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enxio(void)
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{
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return (ENXIO);
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}
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2003-09-27 12:53:33 +00:00
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static int
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enodev(void)
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{
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return (ENODEV);
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}
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/* Define a dead_cdevsw for use when devices leave unexpectedly. */
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2003-02-20 15:35:54 +00:00
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#define dead_open (d_open_t *)enxio
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#define dead_close (d_close_t *)enxio
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#define dead_read (d_read_t *)enxio
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#define dead_write (d_write_t *)enxio
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#define dead_ioctl (d_ioctl_t *)enxio
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2003-09-27 12:53:33 +00:00
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#define dead_poll (d_poll_t *)enodev
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#define dead_mmap (d_mmap_t *)enodev
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2003-02-20 15:35:54 +00:00
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static void
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dead_strategy(struct bio *bp)
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{
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biofinish(bp, NULL, ENXIO);
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}
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2003-02-21 19:00:48 +00:00
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#define dead_dump (dumper_t *)enxio
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2003-02-20 15:35:54 +00:00
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#define dead_kqfilter (d_kqfilter_t *)enxio
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static struct cdevsw dead_cdevsw = {
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2003-03-03 12:15:54 +00:00
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.d_open = dead_open,
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.d_close = dead_close,
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.d_read = dead_read,
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.d_write = dead_write,
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.d_ioctl = dead_ioctl,
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.d_poll = dead_poll,
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.d_mmap = dead_mmap,
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.d_strategy = dead_strategy,
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.d_name = "dead",
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.d_maj = 255,
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.d_dump = dead_dump,
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.d_kqfilter = dead_kqfilter
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2003-02-20 15:35:54 +00:00
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};
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2003-09-27 12:53:33 +00:00
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/* Default methods if driver does not specify method */
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#define null_open (d_open_t *)nullop
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#define null_close (d_close_t *)nullop
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#define no_read (d_read_t *)enodev
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#define no_write (d_write_t *)enodev
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#define no_ioctl (d_ioctl_t *)enodev
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#define no_mmap (d_mmap_t *)enodev
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static int
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no_kqfilter(dev_t dev __unused, struct knote *kn __unused)
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{
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return (1);
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}
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static void
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no_strategy(struct bio *bp)
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{
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biofinish(bp, NULL, ENODEV);
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}
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static int
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no_poll(dev_t dev __unused, int events, struct thread *td __unused)
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{
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/*
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* Return true for read/write. If the user asked for something
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* special, return POLLNVAL, so that clients have a way of
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* determining reliably whether or not the extended
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* functionality is present without hard-coding knowledge
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* of specific filesystem implementations.
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* Stay in sync with vop_nopoll().
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*/
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if (events & ~POLLSTANDARD)
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return (POLLNVAL);
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return (events & (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM));
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}
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#define no_dump (dumper_t *)enodev
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2001-10-27 17:44:21 +00:00
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1999-05-31 11:29:30 +00:00
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struct cdevsw *
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devsw(dev_t dev)
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1999-10-04 11:42:41 +00:00
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{
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1999-08-13 10:29:38 +00:00
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if (dev->si_devsw)
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return (dev->si_devsw);
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2003-02-20 15:35:54 +00:00
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return (&dead_cdevsw);
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1999-05-31 11:29:30 +00:00
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}
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Divorce "dev_t" from the "major|minor" bitmap, which is now called
udev_t in the kernel but still called dev_t in userland.
Provide functions to manipulate both types:
major() umajor()
minor() uminor()
makedev() umakedev()
dev2udev() udev2dev()
For now they're functions, they will become in-line functions
after one of the next two steps in this process.
Return major/minor/makedev to macro-hood for userland.
Register a name in cdevsw[] for the "filedescriptor" driver.
In the kernel the udev_t appears in places where we have the
major/minor number combination, (ie: a potential device: we
may not have the driver nor the device), like in inodes, vattr,
cdevsw registration and so on, whereas the dev_t appears where
we carry around a reference to a actual device.
In the future the cdevsw and the aliased-from vnode will be hung
directly from the dev_t, along with up to two softc pointers for
the device driver and a few houskeeping bits. This will essentially
replace the current "alias" check code (same buck, bigger bang).
A little stunt has been provided to try to catch places where the
wrong type is being used (dev_t vs udev_t), if you see something
not working, #undef DEVT_FASCIST in kern/kern_conf.c and see if
it makes a difference. If it does, please try to track it down
(many hands make light work) or at least try to reproduce it
as simply as possible, and describe how to do that.
Without DEVT_FASCIST I belive this patch is a no-op.
Stylistic/posixoid comments about the userland view of the <sys/*.h>
files welcome now, from userland they now contain the end result.
Next planned step: make all dev_t's refer to the same devsw[] which
means convert BLK's to CHR's at the perimeter of the vnodes and
other places where they enter the game (bootdev, mknod, sysctl).
1999-05-11 19:55:07 +00:00
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/*
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* dev_t and u_dev_t primitives
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*/
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1999-10-04 11:42:41 +00:00
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int
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Divorce "dev_t" from the "major|minor" bitmap, which is now called
udev_t in the kernel but still called dev_t in userland.
Provide functions to manipulate both types:
major() umajor()
minor() uminor()
makedev() umakedev()
dev2udev() udev2dev()
For now they're functions, they will become in-line functions
after one of the next two steps in this process.
Return major/minor/makedev to macro-hood for userland.
Register a name in cdevsw[] for the "filedescriptor" driver.
In the kernel the udev_t appears in places where we have the
major/minor number combination, (ie: a potential device: we
may not have the driver nor the device), like in inodes, vattr,
cdevsw registration and so on, whereas the dev_t appears where
we carry around a reference to a actual device.
In the future the cdevsw and the aliased-from vnode will be hung
directly from the dev_t, along with up to two softc pointers for
the device driver and a few houskeeping bits. This will essentially
replace the current "alias" check code (same buck, bigger bang).
A little stunt has been provided to try to catch places where the
wrong type is being used (dev_t vs udev_t), if you see something
not working, #undef DEVT_FASCIST in kern/kern_conf.c and see if
it makes a difference. If it does, please try to track it down
(many hands make light work) or at least try to reproduce it
as simply as possible, and describe how to do that.
Without DEVT_FASCIST I belive this patch is a no-op.
Stylistic/posixoid comments about the userland view of the <sys/*.h>
files welcome now, from userland they now contain the end result.
Next planned step: make all dev_t's refer to the same devsw[] which
means convert BLK's to CHR's at the perimeter of the vnodes and
other places where they enter the game (bootdev, mknod, sysctl).
1999-05-11 19:55:07 +00:00
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major(dev_t x)
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{
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1999-07-20 09:47:55 +00:00
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if (x == NODEV)
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return NOUDEV;
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return((x->si_udev >> 8) & 0xff);
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Divorce "dev_t" from the "major|minor" bitmap, which is now called
udev_t in the kernel but still called dev_t in userland.
Provide functions to manipulate both types:
major() umajor()
minor() uminor()
makedev() umakedev()
dev2udev() udev2dev()
For now they're functions, they will become in-line functions
after one of the next two steps in this process.
Return major/minor/makedev to macro-hood for userland.
Register a name in cdevsw[] for the "filedescriptor" driver.
In the kernel the udev_t appears in places where we have the
major/minor number combination, (ie: a potential device: we
may not have the driver nor the device), like in inodes, vattr,
cdevsw registration and so on, whereas the dev_t appears where
we carry around a reference to a actual device.
In the future the cdevsw and the aliased-from vnode will be hung
directly from the dev_t, along with up to two softc pointers for
the device driver and a few houskeeping bits. This will essentially
replace the current "alias" check code (same buck, bigger bang).
A little stunt has been provided to try to catch places where the
wrong type is being used (dev_t vs udev_t), if you see something
not working, #undef DEVT_FASCIST in kern/kern_conf.c and see if
it makes a difference. If it does, please try to track it down
(many hands make light work) or at least try to reproduce it
as simply as possible, and describe how to do that.
Without DEVT_FASCIST I belive this patch is a no-op.
Stylistic/posixoid comments about the userland view of the <sys/*.h>
files welcome now, from userland they now contain the end result.
Next planned step: make all dev_t's refer to the same devsw[] which
means convert BLK's to CHR's at the perimeter of the vnodes and
other places where they enter the game (bootdev, mknod, sysctl).
1999-05-11 19:55:07 +00:00
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}
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int
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minor(dev_t x)
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{
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1999-07-20 09:47:55 +00:00
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if (x == NODEV)
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return NOUDEV;
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return(x->si_udev & 0xffff00ff);
|
Divorce "dev_t" from the "major|minor" bitmap, which is now called
udev_t in the kernel but still called dev_t in userland.
Provide functions to manipulate both types:
major() umajor()
minor() uminor()
makedev() umakedev()
dev2udev() udev2dev()
For now they're functions, they will become in-line functions
after one of the next two steps in this process.
Return major/minor/makedev to macro-hood for userland.
Register a name in cdevsw[] for the "filedescriptor" driver.
In the kernel the udev_t appears in places where we have the
major/minor number combination, (ie: a potential device: we
may not have the driver nor the device), like in inodes, vattr,
cdevsw registration and so on, whereas the dev_t appears where
we carry around a reference to a actual device.
In the future the cdevsw and the aliased-from vnode will be hung
directly from the dev_t, along with up to two softc pointers for
the device driver and a few houskeeping bits. This will essentially
replace the current "alias" check code (same buck, bigger bang).
A little stunt has been provided to try to catch places where the
wrong type is being used (dev_t vs udev_t), if you see something
not working, #undef DEVT_FASCIST in kern/kern_conf.c and see if
it makes a difference. If it does, please try to track it down
(many hands make light work) or at least try to reproduce it
as simply as possible, and describe how to do that.
Without DEVT_FASCIST I belive this patch is a no-op.
Stylistic/posixoid comments about the userland view of the <sys/*.h>
files welcome now, from userland they now contain the end result.
Next planned step: make all dev_t's refer to the same devsw[] which
means convert BLK's to CHR's at the perimeter of the vnodes and
other places where they enter the game (bootdev, mknod, sysctl).
1999-05-11 19:55:07 +00:00
|
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|
}
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|
1999-08-15 09:32:47 +00:00
|
|
|
int
|
2000-09-19 10:28:44 +00:00
|
|
|
dev2unit(dev_t x)
|
1999-08-15 09:32:47 +00:00
|
|
|
{
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int i;
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if (x == NODEV)
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return NOUDEV;
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i = minor(x);
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return ((i & 0xff) | (i >> 8));
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|
}
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|
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|
2000-09-19 10:28:44 +00:00
|
|
|
int
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|
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|
|
unit2minor(int unit)
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|
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|
|
{
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|
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|
2001-03-20 13:24:24 +00:00
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|
|
KASSERT(unit <= 0xffffff, ("Invalid unit (%d) in unit2minor", unit));
|
2000-09-19 10:28:44 +00:00
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|
|
return ((unit & 0xff) | ((unit << 8) & ~0xffff));
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|
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|
}
|
|
|
|
|
|
2000-08-20 21:34:39 +00:00
|
|
|
static dev_t
|
|
|
|
|
allocdev(void)
|
|
|
|
|
{
|
|
|
|
|
static int stashed;
|
2002-09-27 18:27:10 +00:00
|
|
|
struct cdev *si;
|
2000-08-20 21:34:39 +00:00
|
|
|
|
2002-09-08 15:15:12 +00:00
|
|
|
if (LIST_FIRST(&dev_free)) {
|
2000-08-20 21:34:39 +00:00
|
|
|
si = LIST_FIRST(&dev_free);
|
|
|
|
|
LIST_REMOVE(si, si_hash);
|
2002-09-08 15:15:12 +00:00
|
|
|
} else if (stashed >= DEVT_STASH) {
|
2002-09-27 18:27:10 +00:00
|
|
|
MALLOC(si, struct cdev *, sizeof(*si), M_DEVT,
|
2003-02-19 22:51:33 +00:00
|
|
|
M_USE_RESERVE | M_ZERO | M_WAITOK);
|
2000-08-20 21:34:39 +00:00
|
|
|
} else {
|
|
|
|
|
si = devt_stash + stashed++;
|
2001-05-26 08:27:58 +00:00
|
|
|
bzero(si, sizeof *si);
|
2002-09-08 15:15:12 +00:00
|
|
|
si->si_flags |= SI_STASHED;
|
2000-08-20 21:34:39 +00:00
|
|
|
}
|
2003-02-04 10:32:40 +00:00
|
|
|
si->__si_namebuf[0] = '\0';
|
|
|
|
|
si->si_name = si->__si_namebuf;
|
2001-05-26 08:27:58 +00:00
|
|
|
LIST_INIT(&si->si_children);
|
2001-03-07 07:09:55 +00:00
|
|
|
TAILQ_INIT(&si->si_snapshots);
|
2000-08-20 21:34:39 +00:00
|
|
|
return (si);
|
|
|
|
|
}
|
|
|
|
|
|
Divorce "dev_t" from the "major|minor" bitmap, which is now called
udev_t in the kernel but still called dev_t in userland.
Provide functions to manipulate both types:
major() umajor()
minor() uminor()
makedev() umakedev()
dev2udev() udev2dev()
For now they're functions, they will become in-line functions
after one of the next two steps in this process.
Return major/minor/makedev to macro-hood for userland.
Register a name in cdevsw[] for the "filedescriptor" driver.
In the kernel the udev_t appears in places where we have the
major/minor number combination, (ie: a potential device: we
may not have the driver nor the device), like in inodes, vattr,
cdevsw registration and so on, whereas the dev_t appears where
we carry around a reference to a actual device.
In the future the cdevsw and the aliased-from vnode will be hung
directly from the dev_t, along with up to two softc pointers for
the device driver and a few houskeeping bits. This will essentially
replace the current "alias" check code (same buck, bigger bang).
A little stunt has been provided to try to catch places where the
wrong type is being used (dev_t vs udev_t), if you see something
not working, #undef DEVT_FASCIST in kern/kern_conf.c and see if
it makes a difference. If it does, please try to track it down
(many hands make light work) or at least try to reproduce it
as simply as possible, and describe how to do that.
Without DEVT_FASCIST I belive this patch is a no-op.
Stylistic/posixoid comments about the userland view of the <sys/*.h>
files welcome now, from userland they now contain the end result.
Next planned step: make all dev_t's refer to the same devsw[] which
means convert BLK's to CHR's at the perimeter of the vnodes and
other places where they enter the game (bootdev, mknod, sysctl).
1999-05-11 19:55:07 +00:00
|
|
|
dev_t
|
|
|
|
|
makedev(int x, int y)
|
|
|
|
|
{
|
2002-09-27 18:27:10 +00:00
|
|
|
struct cdev *si;
|
1999-07-20 09:47:55 +00:00
|
|
|
udev_t udev;
|
|
|
|
|
int hash;
|
|
|
|
|
|
2000-01-04 12:51:50 +00:00
|
|
|
if (x == umajor(NOUDEV) && y == uminor(NOUDEV))
|
2001-01-21 21:19:49 +00:00
|
|
|
panic("makedev of NOUDEV");
|
1999-07-20 09:47:55 +00:00
|
|
|
udev = (x << 8) | y;
|
|
|
|
|
hash = udev % DEVT_HASH;
|
1999-08-29 09:09:12 +00:00
|
|
|
LIST_FOREACH(si, &dev_hash[hash], si_hash) {
|
1999-07-20 09:47:55 +00:00
|
|
|
if (si->si_udev == udev)
|
|
|
|
|
return (si);
|
|
|
|
|
}
|
2000-08-20 21:34:39 +00:00
|
|
|
si = allocdev();
|
1999-07-20 09:47:55 +00:00
|
|
|
si->si_udev = udev;
|
1999-08-29 09:09:12 +00:00
|
|
|
LIST_INSERT_HEAD(&dev_hash[hash], si, si_hash);
|
1999-07-20 09:47:55 +00:00
|
|
|
return (si);
|
Divorce "dev_t" from the "major|minor" bitmap, which is now called
udev_t in the kernel but still called dev_t in userland.
Provide functions to manipulate both types:
major() umajor()
minor() uminor()
makedev() umakedev()
dev2udev() udev2dev()
For now they're functions, they will become in-line functions
after one of the next two steps in this process.
Return major/minor/makedev to macro-hood for userland.
Register a name in cdevsw[] for the "filedescriptor" driver.
In the kernel the udev_t appears in places where we have the
major/minor number combination, (ie: a potential device: we
may not have the driver nor the device), like in inodes, vattr,
cdevsw registration and so on, whereas the dev_t appears where
we carry around a reference to a actual device.
In the future the cdevsw and the aliased-from vnode will be hung
directly from the dev_t, along with up to two softc pointers for
the device driver and a few houskeeping bits. This will essentially
replace the current "alias" check code (same buck, bigger bang).
A little stunt has been provided to try to catch places where the
wrong type is being used (dev_t vs udev_t), if you see something
not working, #undef DEVT_FASCIST in kern/kern_conf.c and see if
it makes a difference. If it does, please try to track it down
(many hands make light work) or at least try to reproduce it
as simply as possible, and describe how to do that.
Without DEVT_FASCIST I belive this patch is a no-op.
Stylistic/posixoid comments about the userland view of the <sys/*.h>
files welcome now, from userland they now contain the end result.
Next planned step: make all dev_t's refer to the same devsw[] which
means convert BLK's to CHR's at the perimeter of the vnodes and
other places where they enter the game (bootdev, mknod, sysctl).
1999-05-11 19:55:07 +00:00
|
|
|
}
|
|
|
|
|
|
1999-08-29 09:09:12 +00:00
|
|
|
void
|
|
|
|
|
freedev(dev_t dev)
|
|
|
|
|
{
|
|
|
|
|
|
|
|
|
|
if (!free_devt)
|
|
|
|
|
return;
|
|
|
|
|
if (SLIST_FIRST(&dev->si_hlist))
|
|
|
|
|
return;
|
1999-10-04 11:42:41 +00:00
|
|
|
if (dev->si_devsw || dev->si_drv1 || dev->si_drv2)
|
1999-08-29 09:09:12 +00:00
|
|
|
return;
|
|
|
|
|
LIST_REMOVE(dev, si_hash);
|
|
|
|
|
if (dev->si_flags & SI_STASHED) {
|
|
|
|
|
bzero(dev, sizeof(*dev));
|
2001-05-26 08:27:58 +00:00
|
|
|
dev->si_flags |= SI_STASHED;
|
1999-08-29 09:09:12 +00:00
|
|
|
LIST_INSERT_HEAD(&dev_free, dev, si_hash);
|
|
|
|
|
} else {
|
|
|
|
|
FREE(dev, M_DEVT);
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
Divorce "dev_t" from the "major|minor" bitmap, which is now called
udev_t in the kernel but still called dev_t in userland.
Provide functions to manipulate both types:
major() umajor()
minor() uminor()
makedev() umakedev()
dev2udev() udev2dev()
For now they're functions, they will become in-line functions
after one of the next two steps in this process.
Return major/minor/makedev to macro-hood for userland.
Register a name in cdevsw[] for the "filedescriptor" driver.
In the kernel the udev_t appears in places where we have the
major/minor number combination, (ie: a potential device: we
may not have the driver nor the device), like in inodes, vattr,
cdevsw registration and so on, whereas the dev_t appears where
we carry around a reference to a actual device.
In the future the cdevsw and the aliased-from vnode will be hung
directly from the dev_t, along with up to two softc pointers for
the device driver and a few houskeeping bits. This will essentially
replace the current "alias" check code (same buck, bigger bang).
A little stunt has been provided to try to catch places where the
wrong type is being used (dev_t vs udev_t), if you see something
not working, #undef DEVT_FASCIST in kern/kern_conf.c and see if
it makes a difference. If it does, please try to track it down
(many hands make light work) or at least try to reproduce it
as simply as possible, and describe how to do that.
Without DEVT_FASCIST I belive this patch is a no-op.
Stylistic/posixoid comments about the userland view of the <sys/*.h>
files welcome now, from userland they now contain the end result.
Next planned step: make all dev_t's refer to the same devsw[] which
means convert BLK's to CHR's at the perimeter of the vnodes and
other places where they enter the game (bootdev, mknod, sysctl).
1999-05-11 19:55:07 +00:00
|
|
|
udev_t
|
|
|
|
|
dev2udev(dev_t x)
|
|
|
|
|
{
|
1999-07-20 09:47:55 +00:00
|
|
|
if (x == NODEV)
|
|
|
|
|
return NOUDEV;
|
|
|
|
|
return (x->si_udev);
|
Divorce "dev_t" from the "major|minor" bitmap, which is now called
udev_t in the kernel but still called dev_t in userland.
Provide functions to manipulate both types:
major() umajor()
minor() uminor()
makedev() umakedev()
dev2udev() udev2dev()
For now they're functions, they will become in-line functions
after one of the next two steps in this process.
Return major/minor/makedev to macro-hood for userland.
Register a name in cdevsw[] for the "filedescriptor" driver.
In the kernel the udev_t appears in places where we have the
major/minor number combination, (ie: a potential device: we
may not have the driver nor the device), like in inodes, vattr,
cdevsw registration and so on, whereas the dev_t appears where
we carry around a reference to a actual device.
In the future the cdevsw and the aliased-from vnode will be hung
directly from the dev_t, along with up to two softc pointers for
the device driver and a few houskeeping bits. This will essentially
replace the current "alias" check code (same buck, bigger bang).
A little stunt has been provided to try to catch places where the
wrong type is being used (dev_t vs udev_t), if you see something
not working, #undef DEVT_FASCIST in kern/kern_conf.c and see if
it makes a difference. If it does, please try to track it down
(many hands make light work) or at least try to reproduce it
as simply as possible, and describe how to do that.
Without DEVT_FASCIST I belive this patch is a no-op.
Stylistic/posixoid comments about the userland view of the <sys/*.h>
files welcome now, from userland they now contain the end result.
Next planned step: make all dev_t's refer to the same devsw[] which
means convert BLK's to CHR's at the perimeter of the vnodes and
other places where they enter the game (bootdev, mknod, sysctl).
1999-05-11 19:55:07 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
|
|
dev_t
|
|
|
|
|
udev2dev(udev_t x, int b)
|
|
|
|
|
{
|
2000-01-04 12:51:50 +00:00
|
|
|
|
|
|
|
|
if (x == NOUDEV)
|
|
|
|
|
return (NODEV);
|
1999-07-17 19:57:25 +00:00
|
|
|
switch (b) {
|
|
|
|
|
case 0:
|
|
|
|
|
return makedev(umajor(x), uminor(x));
|
|
|
|
|
case 1:
|
2000-10-31 10:58:14 +00:00
|
|
|
return (NODEV);
|
1999-07-17 19:57:25 +00:00
|
|
|
default:
|
|
|
|
|
Debugger("udev2dev(...,X)");
|
|
|
|
|
return NODEV;
|
|
|
|
|
}
|
Divorce "dev_t" from the "major|minor" bitmap, which is now called
udev_t in the kernel but still called dev_t in userland.
Provide functions to manipulate both types:
major() umajor()
minor() uminor()
makedev() umakedev()
dev2udev() udev2dev()
For now they're functions, they will become in-line functions
after one of the next two steps in this process.
Return major/minor/makedev to macro-hood for userland.
Register a name in cdevsw[] for the "filedescriptor" driver.
In the kernel the udev_t appears in places where we have the
major/minor number combination, (ie: a potential device: we
may not have the driver nor the device), like in inodes, vattr,
cdevsw registration and so on, whereas the dev_t appears where
we carry around a reference to a actual device.
In the future the cdevsw and the aliased-from vnode will be hung
directly from the dev_t, along with up to two softc pointers for
the device driver and a few houskeeping bits. This will essentially
replace the current "alias" check code (same buck, bigger bang).
A little stunt has been provided to try to catch places where the
wrong type is being used (dev_t vs udev_t), if you see something
not working, #undef DEVT_FASCIST in kern/kern_conf.c and see if
it makes a difference. If it does, please try to track it down
(many hands make light work) or at least try to reproduce it
as simply as possible, and describe how to do that.
Without DEVT_FASCIST I belive this patch is a no-op.
Stylistic/posixoid comments about the userland view of the <sys/*.h>
files welcome now, from userland they now contain the end result.
Next planned step: make all dev_t's refer to the same devsw[] which
means convert BLK's to CHR's at the perimeter of the vnodes and
other places where they enter the game (bootdev, mknod, sysctl).
1999-05-11 19:55:07 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
|
|
int
|
|
|
|
|
uminor(udev_t dev)
|
|
|
|
|
{
|
|
|
|
|
return(dev & 0xffff00ff);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
int
|
|
|
|
|
umajor(udev_t dev)
|
|
|
|
|
{
|
|
|
|
|
return((dev & 0xff00) >> 8);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
udev_t
|
1999-07-17 18:43:50 +00:00
|
|
|
makeudev(int x, int y)
|
Divorce "dev_t" from the "major|minor" bitmap, which is now called
udev_t in the kernel but still called dev_t in userland.
Provide functions to manipulate both types:
major() umajor()
minor() uminor()
makedev() umakedev()
dev2udev() udev2dev()
For now they're functions, they will become in-line functions
after one of the next two steps in this process.
Return major/minor/makedev to macro-hood for userland.
Register a name in cdevsw[] for the "filedescriptor" driver.
In the kernel the udev_t appears in places where we have the
major/minor number combination, (ie: a potential device: we
may not have the driver nor the device), like in inodes, vattr,
cdevsw registration and so on, whereas the dev_t appears where
we carry around a reference to a actual device.
In the future the cdevsw and the aliased-from vnode will be hung
directly from the dev_t, along with up to two softc pointers for
the device driver and a few houskeeping bits. This will essentially
replace the current "alias" check code (same buck, bigger bang).
A little stunt has been provided to try to catch places where the
wrong type is being used (dev_t vs udev_t), if you see something
not working, #undef DEVT_FASCIST in kern/kern_conf.c and see if
it makes a difference. If it does, please try to track it down
(many hands make light work) or at least try to reproduce it
as simply as possible, and describe how to do that.
Without DEVT_FASCIST I belive this patch is a no-op.
Stylistic/posixoid comments about the userland view of the <sys/*.h>
files welcome now, from userland they now contain the end result.
Next planned step: make all dev_t's refer to the same devsw[] which
means convert BLK's to CHR's at the perimeter of the vnodes and
other places where they enter the game (bootdev, mknod, sysctl).
1999-05-11 19:55:07 +00:00
|
|
|
{
|
|
|
|
|
return ((x << 8) | y);
|
|
|
|
|
}
|
|
|
|
|
|
2004-02-15 10:35:33 +00:00
|
|
|
static void
|
|
|
|
|
prep_cdevsw(struct cdevsw *devsw)
|
1999-08-08 18:43:05 +00:00
|
|
|
{
|
|
|
|
|
int i;
|
|
|
|
|
|
2003-09-27 12:53:33 +00:00
|
|
|
if (devsw->d_open == NULL) devsw->d_open = null_open;
|
|
|
|
|
if (devsw->d_close == NULL) devsw->d_close = null_close;
|
|
|
|
|
if (devsw->d_read == NULL) devsw->d_read = no_read;
|
|
|
|
|
if (devsw->d_write == NULL) devsw->d_write = no_write;
|
|
|
|
|
if (devsw->d_ioctl == NULL) devsw->d_ioctl = no_ioctl;
|
|
|
|
|
if (devsw->d_poll == NULL) devsw->d_poll = no_poll;
|
|
|
|
|
if (devsw->d_mmap == NULL) devsw->d_mmap = no_mmap;
|
|
|
|
|
if (devsw->d_strategy == NULL) devsw->d_strategy = no_strategy;
|
|
|
|
|
if (devsw->d_dump == NULL) devsw->d_dump = no_dump;
|
|
|
|
|
if (devsw->d_kqfilter == NULL) devsw->d_kqfilter = no_kqfilter;
|
2003-03-02 19:46:45 +00:00
|
|
|
|
2003-02-27 14:46:51 +00:00
|
|
|
if (devsw->d_maj == MAJOR_AUTO) {
|
|
|
|
|
for (i = NUMCDEVSW - 1; i > 0; i--)
|
|
|
|
|
if (reserved_majors[i] != i)
|
|
|
|
|
break;
|
|
|
|
|
KASSERT(i > 0, ("Out of major numbers (%s)", devsw->d_name));
|
|
|
|
|
devsw->d_maj = i;
|
|
|
|
|
reserved_majors[i] = i;
|
2003-02-27 15:17:37 +00:00
|
|
|
} else {
|
2003-03-09 10:28:05 +00:00
|
|
|
if (devsw->d_maj == 256) /* XXX: tty_cons.c is magic */
|
|
|
|
|
devsw->d_maj = 0;
|
2003-02-27 15:17:37 +00:00
|
|
|
KASSERT(devsw->d_maj >= 0 && devsw->d_maj < 256,
|
|
|
|
|
("Invalid major (%d) in make_dev", devsw->d_maj));
|
|
|
|
|
if (reserved_majors[devsw->d_maj] != devsw->d_maj) {
|
|
|
|
|
printf("WARNING: driver \"%s\" used %s %d\n",
|
|
|
|
|
devsw->d_name, "unreserved major device number",
|
|
|
|
|
devsw->d_maj);
|
|
|
|
|
reserved_majors[devsw->d_maj] = devsw->d_maj;
|
|
|
|
|
}
|
2003-02-27 14:46:51 +00:00
|
|
|
}
|
2004-02-15 10:35:33 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
|
|
dev_t
|
|
|
|
|
make_dev(struct cdevsw *devsw, int minor, uid_t uid, gid_t gid, int perms, const char *fmt, ...)
|
|
|
|
|
{
|
|
|
|
|
dev_t dev;
|
|
|
|
|
va_list ap;
|
|
|
|
|
int i;
|
|
|
|
|
|
|
|
|
|
KASSERT((minor & ~0xffff00ff) == 0,
|
|
|
|
|
("Invalid minor (0x%x) in make_dev", minor));
|
2001-02-02 03:32:11 +00:00
|
|
|
|
2004-02-15 10:35:33 +00:00
|
|
|
prep_cdevsw(devsw);
|
1999-08-08 18:43:05 +00:00
|
|
|
dev = makedev(devsw->d_maj, minor);
|
2003-09-27 21:50:00 +00:00
|
|
|
if (dev->si_flags & SI_CHEAPCLONE &&
|
|
|
|
|
dev->si_flags & SI_NAMED &&
|
|
|
|
|
dev->si_devsw == devsw) {
|
|
|
|
|
/*
|
|
|
|
|
* This is allowed as it removes races and generally
|
|
|
|
|
* simplifies cloning devices.
|
|
|
|
|
*/
|
|
|
|
|
return (dev);
|
|
|
|
|
}
|
2000-09-11 17:15:33 +00:00
|
|
|
if (dev->si_flags & SI_NAMED) {
|
|
|
|
|
printf( "WARNING: Driver mistake: repeat make_dev(\"%s\")\n",
|
|
|
|
|
dev->si_name);
|
2001-10-27 17:44:21 +00:00
|
|
|
panic("don't do that");
|
2000-09-11 17:15:33 +00:00
|
|
|
}
|
1999-08-08 18:43:05 +00:00
|
|
|
va_start(ap, fmt);
|
2003-02-04 11:04:26 +00:00
|
|
|
i = vsnrprintf(dev->__si_namebuf, sizeof dev->__si_namebuf, 32, fmt, ap);
|
|
|
|
|
if (i > (sizeof dev->__si_namebuf - 1)) {
|
|
|
|
|
printf("WARNING: Device name truncated! (%s)",
|
|
|
|
|
dev->__si_namebuf);
|
|
|
|
|
}
|
1999-08-08 18:43:05 +00:00
|
|
|
va_end(ap);
|
|
|
|
|
dev->si_devsw = devsw;
|
2000-08-20 21:34:39 +00:00
|
|
|
dev->si_uid = uid;
|
|
|
|
|
dev->si_gid = gid;
|
|
|
|
|
dev->si_mode = perms;
|
2000-09-11 17:15:33 +00:00
|
|
|
dev->si_flags |= SI_NAMED;
|
2000-08-20 21:34:39 +00:00
|
|
|
|
2003-03-02 13:35:30 +00:00
|
|
|
devfs_create(dev);
|
2000-08-20 21:34:39 +00:00
|
|
|
return (dev);
|
|
|
|
|
}
|
|
|
|
|
|
2001-10-17 18:47:12 +00:00
|
|
|
int
|
|
|
|
|
dev_named(dev_t pdev, const char *name)
|
|
|
|
|
{
|
|
|
|
|
dev_t cdev;
|
|
|
|
|
|
|
|
|
|
if (strcmp(devtoname(pdev), name) == 0)
|
|
|
|
|
return (1);
|
|
|
|
|
LIST_FOREACH(cdev, &pdev->si_children, si_siblings)
|
|
|
|
|
if (strcmp(devtoname(cdev), name) == 0)
|
|
|
|
|
return (1);
|
|
|
|
|
return (0);
|
|
|
|
|
}
|
|
|
|
|
|
2001-05-26 08:27:58 +00:00
|
|
|
void
|
|
|
|
|
dev_depends(dev_t pdev, dev_t cdev)
|
|
|
|
|
{
|
|
|
|
|
|
|
|
|
|
cdev->si_parent = pdev;
|
|
|
|
|
cdev->si_flags |= SI_CHILD;
|
|
|
|
|
LIST_INSERT_HEAD(&pdev->si_children, cdev, si_siblings);
|
|
|
|
|
}
|
|
|
|
|
|
2000-08-20 21:34:39 +00:00
|
|
|
dev_t
|
2001-08-02 20:35:35 +00:00
|
|
|
make_dev_alias(dev_t pdev, const char *fmt, ...)
|
2000-08-20 21:34:39 +00:00
|
|
|
{
|
|
|
|
|
dev_t dev;
|
|
|
|
|
va_list ap;
|
|
|
|
|
int i;
|
|
|
|
|
|
|
|
|
|
dev = allocdev();
|
|
|
|
|
dev->si_flags |= SI_ALIAS;
|
2000-09-11 17:15:33 +00:00
|
|
|
dev->si_flags |= SI_NAMED;
|
2001-05-26 08:27:58 +00:00
|
|
|
dev_depends(pdev, dev);
|
2000-08-20 21:34:39 +00:00
|
|
|
va_start(ap, fmt);
|
2003-02-04 11:04:26 +00:00
|
|
|
i = vsnrprintf(dev->__si_namebuf, sizeof dev->__si_namebuf, 32, fmt, ap);
|
|
|
|
|
if (i > (sizeof dev->__si_namebuf - 1)) {
|
|
|
|
|
printf("WARNING: Device name truncated! (%s)",
|
|
|
|
|
dev->__si_namebuf);
|
|
|
|
|
}
|
2000-08-20 21:34:39 +00:00
|
|
|
va_end(ap);
|
1999-08-20 20:25:00 +00:00
|
|
|
|
2003-03-02 13:35:30 +00:00
|
|
|
devfs_create(dev);
|
1999-08-08 18:43:05 +00:00
|
|
|
return (dev);
|
|
|
|
|
}
|
|
|
|
|
|
1999-08-29 09:09:12 +00:00
|
|
|
void
|
1999-11-08 07:44:01 +00:00
|
|
|
destroy_dev(dev_t dev)
|
1999-08-29 09:09:12 +00:00
|
|
|
{
|
2000-09-11 17:15:33 +00:00
|
|
|
|
|
|
|
|
if (!(dev->si_flags & SI_NAMED)) {
|
|
|
|
|
printf( "WARNING: Driver mistake: destroy_dev on %d/%d\n",
|
|
|
|
|
major(dev), minor(dev));
|
2001-10-27 17:44:21 +00:00
|
|
|
panic("don't do that");
|
2000-09-11 17:15:33 +00:00
|
|
|
}
|
|
|
|
|
|
2003-03-02 13:35:30 +00:00
|
|
|
devfs_destroy(dev);
|
2001-05-26 08:27:58 +00:00
|
|
|
if (dev->si_flags & SI_CHILD) {
|
|
|
|
|
LIST_REMOVE(dev, si_siblings);
|
|
|
|
|
dev->si_flags &= ~SI_CHILD;
|
|
|
|
|
}
|
|
|
|
|
while (!LIST_EMPTY(&dev->si_children))
|
|
|
|
|
destroy_dev(LIST_FIRST(&dev->si_children));
|
1999-08-29 09:09:12 +00:00
|
|
|
dev->si_drv1 = 0;
|
|
|
|
|
dev->si_drv2 = 0;
|
|
|
|
|
dev->si_devsw = 0;
|
2002-04-25 13:17:33 +00:00
|
|
|
bzero(&dev->__si_u, sizeof(dev->__si_u));
|
2000-09-11 17:15:33 +00:00
|
|
|
dev->si_flags &= ~SI_NAMED;
|
|
|
|
|
dev->si_flags &= ~SI_ALIAS;
|
1999-08-29 09:09:12 +00:00
|
|
|
freedev(dev);
|
|
|
|
|
}
|
|
|
|
|
|
1999-09-13 12:29:32 +00:00
|
|
|
const char *
|
1999-08-17 20:25:50 +00:00
|
|
|
devtoname(dev_t dev)
|
|
|
|
|
{
|
1999-08-29 09:09:12 +00:00
|
|
|
char *p;
|
1999-09-13 12:29:32 +00:00
|
|
|
int mynor;
|
1999-08-29 09:09:12 +00:00
|
|
|
|
|
|
|
|
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);
|
1999-09-13 12:29:32 +00:00
|
|
|
mynor = minor(dev);
|
|
|
|
|
if (mynor < 0 || mynor > 255)
|
|
|
|
|
sprintf(p, "%#x", (u_int)mynor);
|
|
|
|
|
else
|
|
|
|
|
sprintf(p, "%d", mynor);
|
1999-08-29 09:09:12 +00:00
|
|
|
}
|
1999-08-17 20:25:50 +00:00
|
|
|
return (dev->si_name);
|
|
|
|
|
}
|
2000-09-02 19:17:34 +00:00
|
|
|
|
|
|
|
|
int
|
2002-03-10 10:50:05 +00:00
|
|
|
dev_stdclone(char *name, char **namep, const char *stem, int *unit)
|
2000-09-02 19:17:34 +00:00
|
|
|
{
|
|
|
|
|
int u, i;
|
|
|
|
|
|
|
|
|
|
i = strlen(stem);
|
2001-04-14 21:33:58 +00:00
|
|
|
if (bcmp(stem, name, i) != 0)
|
|
|
|
|
return (0);
|
2000-09-02 19:17:34 +00:00
|
|
|
if (!isdigit(name[i]))
|
|
|
|
|
return (0);
|
|
|
|
|
u = 0;
|
2001-11-16 17:05:07 +00:00
|
|
|
if (name[i] == '0' && isdigit(name[i+1]))
|
|
|
|
|
return (0);
|
2000-09-02 19:17:34 +00:00
|
|
|
while (isdigit(name[i])) {
|
|
|
|
|
u *= 10;
|
|
|
|
|
u += name[i++] - '0';
|
|
|
|
|
}
|
2002-10-05 17:10:28 +00:00
|
|
|
if (u > 0xffffff)
|
|
|
|
|
return (0);
|
2000-09-02 19:17:34 +00:00
|
|
|
*unit = u;
|
|
|
|
|
if (namep)
|
|
|
|
|
*namep = &name[i];
|
|
|
|
|
if (name[i])
|
|
|
|
|
return (2);
|
|
|
|
|
return (1);
|
|
|
|
|
}
|
2000-09-09 11:39:59 +00:00
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
* 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);
|
2001-01-21 21:19:49 +00:00
|
|
|
if (ud == NOUDEV)
|
|
|
|
|
return(EINVAL);
|
2000-09-09 11:39:59 +00:00
|
|
|
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);
|
|
|
|
|
}
|
|
|
|
|
|
2000-10-29 19:50:06 +00:00
|
|
|
SYSCTL_PROC(_kern, OID_AUTO, devname, CTLTYPE_OPAQUE|CTLFLAG_RW|CTLFLAG_ANYBODY,
|
2000-09-09 11:39:59 +00:00
|
|
|
NULL, 0, sysctl_devname, "", "devname(3) handler");
|
