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freebsd-skq/sys/kern/kern_conf.c

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Obtained from: well it has a relationship with the LKM code.. This is a place for all things to do with conf.c and conf.h that are not machine specific. Other things that are at present in i386/isa/conf.c might migrate into here.. It's the first small step in cleaning up the device interface to make it more dynamic and to assist in more modular drivers (i.e. both loadable via LKMs and linked in.. e.g able to add a device without having to edit conf.c) this code is not yet used and the whole thing will be conditionally compiled in for a while till proven useful :)
1995-10-02 09:24:44 +00:00
/*-
Assert my copyright on this file (using the default 2-clause BSD). The vast majority of the contents is from my keyboard and no significant pieces remain of the former copyright holders code.
2002-09-20 22:26:27 +00:00
* Copyright (c) 1999-2002 Poul-Henning Kamp
Obtained from: well it has a relationship with the LKM code.. This is a place for all things to do with conf.c and conf.h that are not machine specific. Other things that are at present in i386/isa/conf.c might migrate into here.. It's the first small step in cleaning up the device interface to make it more dynamic and to assist in more modular drivers (i.e. both loadable via LKMs and linked in.. e.g able to add a device without having to edit conf.c) this code is not yet used and the whole thing will be conditionally compiled in for a while till proven useful :)
1995-10-02 09:24:44 +00:00
* 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.
*
Assert my copyright on this file (using the default 2-clause BSD). The vast majority of the contents is from my keyboard and no significant pieces remain of the former copyright holders code.
2002-09-20 22:26:27 +00:00
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
Obtained from: well it has a relationship with the LKM code.. This is a place for all things to do with conf.c and conf.h that are not machine specific. Other things that are at present in i386/isa/conf.c might migrate into here.. It's the first small step in cleaning up the device interface to make it more dynamic and to assist in more modular drivers (i.e. both loadable via LKMs and linked in.. e.g able to add a device without having to edit conf.c) this code is not yet used and the whole thing will be conditionally compiled in for a while till proven useful :)
1995-10-02 09:24:44 +00:00
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
Assert my copyright on this file (using the default 2-clause BSD). The vast majority of the contents is from my keyboard and no significant pieces remain of the former copyright holders code.
2002-09-20 22:26:27 +00:00
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
Obtained from: well it has a relationship with the LKM code.. This is a place for all things to do with conf.c and conf.h that are not machine specific. Other things that are at present in i386/isa/conf.c might migrate into here.. It's the first small step in cleaning up the device interface to make it more dynamic and to assist in more modular drivers (i.e. both loadable via LKMs and linked in.. e.g able to add a device without having to edit conf.c) this code is not yet used and the whole thing will be conditionally compiled in for a while till proven useful :)
1995-10-02 09:24:44 +00:00
* 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.
*/
Use __FBSDID().
2003-06-11 00:56:59 +00:00
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
Obtained from: well it has a relationship with the LKM code.. This is a place for all things to do with conf.c and conf.h that are not machine specific. Other things that are at present in i386/isa/conf.c might migrate into here.. It's the first small step in cleaning up the device interface to make it more dynamic and to assist in more modular drivers (i.e. both loadable via LKMs and linked in.. e.g able to add a device without having to edit conf.c) this code is not yet used and the whole thing will be conditionally compiled in for a while till proven useful :)
1995-10-02 09:24:44 +00:00
#include <sys/param.h>
Now a dev_t is a pointer to struct specinfo which is shared by all specdev vnodes referencing this device. Details: cdevsw->d_parms has been removed, the specinfo is available now (== dev_t) and the driver should modify it directly when applicable, and the only driver doing so, does so: vn.c. I am not sure the logic in checking for "<" was right before, and it looks even less so now. An intial pool of 50 struct specinfo are depleted during early boot, after that malloc had better work. It is likely that fewer than 50 would do. Hashing is done from udev_t to dev_t with a prime number remainder hash, experiments show no better hash available for decent cost (MD5 is only marginally better) The prime number used should not be close to a power of two, we use 83 for now. Add new checkalias2() to get around the loss of info from dev2udev() in bdevvp(); The aliased vnodes are hung on a list straight of the dev_t, and speclisth[SPECSZ] is unused. The sharing of struct specinfo means that the v_specnext moves into the vnode which grows by 4 bytes. Don't use a VBLK dev_t which doesn't make sense in MFS, now we hang a dummy cdevsw on B/Cmaj 253 so that things look sane. Storage overhead from all of this is O(50k). Bump __FreeBSD_version to 400009 The next step will add the stuff needed so device-drivers can start to hang things from struct specinfo
1999-07-20 09:47:55 +00:00
#include <sys/kernel.h>
actually compiles.. (previous commit was to just get it into the tree)
1995-10-02 10:15:40 +00:00
#include <sys/systm.h>
Add a dead_cdevsw which does its best to return ENXIO if at all possible. In devsw() return dead_cdevsw instead of NULL in case the dev_t does not have a si_devsw. This may improve our survival chances with devices which go away unexpectedly.
2003-02-20 15:35:54 +00:00
#include <sys/bio.h>
(Doing that whole test-immediately-after-commit-thing like obrien sez:) Forgot to include lock.h and mutex.h for GIANT_REQUIRED.
2002-02-16 17:44:43 +00:00
#include <sys/lock.h>
#include <sys/mutex.h>
KSE Milestone 2 Note ALL MODULES MUST BE RECOMPILED make the kernel aware that there are smaller units of scheduling than the process. (but only allow one thread per process at this time). This is functionally equivalent to teh previousl -current except that there is a thread associated with each process. Sorry john! (your next MFC will be a doosie!) Reviewed by: peter@freebsd.org, dillon@freebsd.org X-MFC after: ha ha ha ha
2001-09-12 08:38:13 +00:00
#include <sys/sysctl.h>
This commit fixes various 64bit portability problems required for FreeBSD/alpha. The most significant item is to change the command argument to ioctl functions from int to u_long. This change brings us inline with various other BSD versions. Driver writers may like to use (__FreeBSD_version == 300003) to detect this change. The prototype FreeBSD/alpha machdep will follow in a couple of days time.
1998-06-07 17:13:14 +00:00
#include <sys/module.h>
Now a dev_t is a pointer to struct specinfo which is shared by all specdev vnodes referencing this device. Details: cdevsw->d_parms has been removed, the specinfo is available now (== dev_t) and the driver should modify it directly when applicable, and the only driver doing so, does so: vn.c. I am not sure the logic in checking for "<" was right before, and it looks even less so now. An intial pool of 50 struct specinfo are depleted during early boot, after that malloc had better work. It is likely that fewer than 50 would do. Hashing is done from udev_t to dev_t with a prime number remainder hash, experiments show no better hash available for decent cost (MD5 is only marginally better) The prime number used should not be close to a power of two, we use 83 for now. Add new checkalias2() to get around the loss of info from dev2udev() in bdevvp(); The aliased vnodes are hung on a list straight of the dev_t, and speclisth[SPECSZ] is unused. The sharing of struct specinfo means that the v_specnext moves into the vnode which grows by 4 bytes. Don't use a VBLK dev_t which doesn't make sense in MFS, now we hang a dummy cdevsw on B/Cmaj 253 so that things look sane. Storage overhead from all of this is O(50k). Bump __FreeBSD_version to 400009 The next step will add the stuff needed so device-drivers can start to hang things from struct specinfo
1999-07-20 09:47:55 +00:00
#include <sys/malloc.h>
Obtained from: well it has a relationship with the LKM code.. This is a place for all things to do with conf.c and conf.h that are not machine specific. Other things that are at present in i386/isa/conf.c might migrate into here.. It's the first small step in cleaning up the device interface to make it more dynamic and to assist in more modular drivers (i.e. both loadable via LKMs and linked in.. e.g able to add a device without having to edit conf.c) this code is not yet used and the whole thing will be conditionally compiled in for a while till proven useful :)
1995-10-02 09:24:44 +00:00
#include <sys/conf.h>
i386/i386/conf.c is no longer needed.. remove it from files.i386 redistribute a few last routines to beter places and shoot the file I haven't act actually 'deleted' the file yet togive people time to have done a config.. I.e. they are likely to have done one in a week or so so I'll remove it then.. it's now empty. makes the question of a USL copyright rather moot.
1995-12-21 20:09:46 +00:00
#include <sys/vnode.h>
Now a dev_t is a pointer to struct specinfo which is shared by all specdev vnodes referencing this device. Details: cdevsw->d_parms has been removed, the specinfo is available now (== dev_t) and the driver should modify it directly when applicable, and the only driver doing so, does so: vn.c. I am not sure the logic in checking for "<" was right before, and it looks even less so now. An intial pool of 50 struct specinfo are depleted during early boot, after that malloc had better work. It is likely that fewer than 50 would do. Hashing is done from udev_t to dev_t with a prime number remainder hash, experiments show no better hash available for decent cost (MD5 is only marginally better) The prime number used should not be close to a power of two, we use 83 for now. Add new checkalias2() to get around the loss of info from dev2udev() in bdevvp(); The aliased vnodes are hung on a list straight of the dev_t, and speclisth[SPECSZ] is unused. The sharing of struct specinfo means that the v_specnext moves into the vnode which grows by 4 bytes. Don't use a VBLK dev_t which doesn't make sense in MFS, now we hang a dummy cdevsw on B/Cmaj 253 so that things look sane. Storage overhead from all of this is O(50k). Bump __FreeBSD_version to 400009 The next step will add the stuff needed so device-drivers can start to hang things from struct specinfo
1999-07-20 09:47:55 +00:00
#include <sys/queue.h>
Introduce no_poll() default method for device drivers. Have it do exactly the same as vop_nopoll() for consistency and put a comment in the two pointing at each other. Retire seltrue() in favour of no_poll(). Create private default functions in kern_conf.c instead of public ones. Change default strategy to return the bio with ENODEV instead of doing nothing which would lead the bio stranded. Retire public nullopen() and nullclose() as well as the entire band of public no{read,write,ioctl,mmap,kqfilter,strategy,poll,dump} funtions, they are the default actions now. Move the final two trivial functions from subr_xxx.c to kern_conf.c and retire the now empty subr_xxx.c
2003-09-27 12:53:33 +00:00
#include <sys/poll.h>
Avoid the modules madness I inadvertently introduced by making the cloning infrastructure standard in kern_conf. Modules are now the same with or without devfs support. If you need to detect if devfs is present, in modules or elsewhere, check the integer variable "devfs_present". This happily removes an ugly hack from kern/vfs_conf.c. This forces a rename of the eventhandler and the standard clone helper function. Include <sys/eventhandler.h> in <sys/conf.h>: it's a helper #include like <sys/queue.h> Remove all #includes of opt_devfs.h they no longer matter.
2000-09-02 19:17:34 +00:00
#include <sys/ctype.h>
Device megapatch 3/6: Add missing D_TTY flags to various drivers. Complete asserts that dev_t's passed to ttyread(), ttywrite(), ttypoll() and ttykqwrite() have (d_flags & D_TTY) and a struct tty pointer. Make ttyread(), ttywrite(), ttypoll() and ttykqwrite() the default cdevsw methods for D_TTY drivers and remove the explicit initializations in various drivers cdevsw structures.
2004-02-21 20:41:11 +00:00
#include <sys/tty.h>
Decommision miscfs/specfs/specdev.h. Most of it goes into <sys/conf.h>, a few lines into <sys/vnode.h>. Add a few fields to struct specinfo, paving the way for the fun part.
1999-08-08 18:43:05 +00:00
#include <machine/stdarg.h>
i386/i386/conf.c is no longer needed.. remove it from files.i386 redistribute a few last routines to beter places and shoot the file I haven't act actually 'deleted' the file yet togive people time to have done a config.. I.e. they are likely to have done one in a week or so so I'll remove it then.. it's now empty. makes the question of a USL copyright rather moot.
1995-12-21 20:09:46 +00:00
Staticize some malloc M_ instances.
2000-12-08 20:09:00 +00:00
static MALLOC_DEFINE(M_DEVT, "dev_t", "dev_t storage");
Now a dev_t is a pointer to struct specinfo which is shared by all specdev vnodes referencing this device. Details: cdevsw->d_parms has been removed, the specinfo is available now (== dev_t) and the driver should modify it directly when applicable, and the only driver doing so, does so: vn.c. I am not sure the logic in checking for "<" was right before, and it looks even less so now. An intial pool of 50 struct specinfo are depleted during early boot, after that malloc had better work. It is likely that fewer than 50 would do. Hashing is done from udev_t to dev_t with a prime number remainder hash, experiments show no better hash available for decent cost (MD5 is only marginally better) The prime number used should not be close to a power of two, we use 83 for now. Add new checkalias2() to get around the loss of info from dev2udev() in bdevvp(); The aliased vnodes are hung on a list straight of the dev_t, and speclisth[SPECSZ] is unused. The sharing of struct specinfo means that the v_specnext moves into the vnode which grows by 4 bytes. Don't use a VBLK dev_t which doesn't make sense in MFS, now we hang a dummy cdevsw on B/Cmaj 253 so that things look sane. Storage overhead from all of this is O(50k). Bump __FreeBSD_version to 400009 The next step will add the stuff needed so device-drivers can start to hang things from struct specinfo
1999-07-20 09:47:55 +00:00
Add support for allocating a device driver major number on demand. To do this, initialize the d_maj member of the cdevsw to MAJOR_AUTO. When the cdevsw is first passed to make_dev() a free major number will be assigned. Until we have a bit more experience with this a printf will announce this fact. Major numbers are not reclaimed, so loading/unloading the same device driver which uses MAJOR_AUTO will eventually deplete the pool of free major numbers and the system will panic when it can not allocate one. Still undecided who to invonvenience with the solution to this.
2003-02-27 14:46:51 +00:00
/* Built at compile time from sys/conf/majors */
extern unsigned char reserved_majors[256];
Put a brief comment on a couple of #defines.
1999-08-28 19:21:36 +00:00
/*
* 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.
*/
Now a dev_t is a pointer to struct specinfo which is shared by all specdev vnodes referencing this device. Details: cdevsw->d_parms has been removed, the specinfo is available now (== dev_t) and the driver should modify it directly when applicable, and the only driver doing so, does so: vn.c. I am not sure the logic in checking for "<" was right before, and it looks even less so now. An intial pool of 50 struct specinfo are depleted during early boot, after that malloc had better work. It is likely that fewer than 50 would do. Hashing is done from udev_t to dev_t with a prime number remainder hash, experiments show no better hash available for decent cost (MD5 is only marginally better) The prime number used should not be close to a power of two, we use 83 for now. Add new checkalias2() to get around the loss of info from dev2udev() in bdevvp(); The aliased vnodes are hung on a list straight of the dev_t, and speclisth[SPECSZ] is unused. The sharing of struct specinfo means that the v_specnext moves into the vnode which grows by 4 bytes. Don't use a VBLK dev_t which doesn't make sense in MFS, now we hang a dummy cdevsw on B/Cmaj 253 so that things look sane. Storage overhead from all of this is O(50k). Bump __FreeBSD_version to 400009 The next step will add the stuff needed so device-drivers can start to hang things from struct specinfo
1999-07-20 09:47:55 +00:00
#define DEVT_HASH 83
Put a brief comment on a couple of #defines.
1999-08-28 19:21:36 +00:00
/* The number of dev_t's we can create before malloc(9) kick in. */
Now a dev_t is a pointer to struct specinfo which is shared by all specdev vnodes referencing this device. Details: cdevsw->d_parms has been removed, the specinfo is available now (== dev_t) and the driver should modify it directly when applicable, and the only driver doing so, does so: vn.c. I am not sure the logic in checking for "<" was right before, and it looks even less so now. An intial pool of 50 struct specinfo are depleted during early boot, after that malloc had better work. It is likely that fewer than 50 would do. Hashing is done from udev_t to dev_t with a prime number remainder hash, experiments show no better hash available for decent cost (MD5 is only marginally better) The prime number used should not be close to a power of two, we use 83 for now. Add new checkalias2() to get around the loss of info from dev2udev() in bdevvp(); The aliased vnodes are hung on a list straight of the dev_t, and speclisth[SPECSZ] is unused. The sharing of struct specinfo means that the v_specnext moves into the vnode which grows by 4 bytes. Don't use a VBLK dev_t which doesn't make sense in MFS, now we hang a dummy cdevsw on B/Cmaj 253 so that things look sane. Storage overhead from all of this is O(50k). Bump __FreeBSD_version to 400009 The next step will add the stuff needed so device-drivers can start to hang things from struct specinfo
1999-07-20 09:47:55 +00:00
#define DEVT_STASH 50
Rename struct specinfo to the more appropriate struct cdev. Agreed on: jake, rwatson, jhb
2002-09-27 18:27:10 +00:00
static struct cdev devt_stash[DEVT_STASH];
Now a dev_t is a pointer to struct specinfo which is shared by all specdev vnodes referencing this device. Details: cdevsw->d_parms has been removed, the specinfo is available now (== dev_t) and the driver should modify it directly when applicable, and the only driver doing so, does so: vn.c. I am not sure the logic in checking for "<" was right before, and it looks even less so now. An intial pool of 50 struct specinfo are depleted during early boot, after that malloc had better work. It is likely that fewer than 50 would do. Hashing is done from udev_t to dev_t with a prime number remainder hash, experiments show no better hash available for decent cost (MD5 is only marginally better) The prime number used should not be close to a power of two, we use 83 for now. Add new checkalias2() to get around the loss of info from dev2udev() in bdevvp(); The aliased vnodes are hung on a list straight of the dev_t, and speclisth[SPECSZ] is unused. The sharing of struct specinfo means that the v_specnext moves into the vnode which grows by 4 bytes. Don't use a VBLK dev_t which doesn't make sense in MFS, now we hang a dummy cdevsw on B/Cmaj 253 so that things look sane. Storage overhead from all of this is O(50k). Bump __FreeBSD_version to 400009 The next step will add the stuff needed so device-drivers can start to hang things from struct specinfo
1999-07-20 09:47:55 +00:00
Rename struct specinfo to the more appropriate struct cdev. Agreed on: jake, rwatson, jhb
2002-09-27 18:27:10 +00:00
static LIST_HEAD(, cdev) dev_hash[DEVT_HASH];
Add dev_t freeing code. Controlled by sysctl debug.free_devt, default is off.
1999-08-29 09:09:12 +00:00
Rename struct specinfo to the more appropriate struct cdev. Agreed on: jake, rwatson, jhb
2002-09-27 18:27:10 +00:00
static LIST_HEAD(, cdev) dev_free;
Continue where Julian left off in July 1998: Virtualize bdevsw[] from cdevsw. bdevsw() is now an (inline) function. Join CDEV_MODULE and BDEV_MODULE to DEV_MODULE (please pay attention to the order of the cmaj/bmaj arguments!) Join CDEV_DRIVER_MODULE and BDEV_DRIVER_MODULE to DEV_DRIVER_MODULE (ditto!) (Next step will be to convert all bdev dev_t's to cdev dev_t's before they get to do any damage^H^H^H^H^H^Hwork in the kernel.)
1999-05-07 10:11:40 +00:00
Add dev_t freeing code. Controlled by sysctl debug.free_devt, default is off.
1999-08-29 09:09:12 +00:00
static int free_devt;
SYSCTL_INT(_debug, OID_AUTO, free_devt, CTLFLAG_RW, &free_devt, 0, "");
Convert DEVFS hooks in (most) drivers to make_dev(). Diskslice/label code not yet handled. Vinum, i4b, alpha, pc98 not dealt with (left to respective Maintainers) Add the correct hook for devfs to kern_conf.c The net result of this excercise is that a lot less files depends on DEVFS, and devtoname() gets more sensible output in many cases. A few drivers had minor additional cleanups performed relating to cdevsw registration. A few drivers don't register a cdevsw{} anymore, but only use make_dev().
1999-08-23 20:59:21 +00:00
Device megapatch 6/6: This is what we came here for: Hang dev_t's from their cdevsw, refcount cdevsw and dev_t and generally keep track of things a lot better than we used to: Hold a cdevsw reference around all entrances into the device driver, this will be necessary to safely determine when we can unload driver code. Hold a dev_t reference while the device is open. KASSERT that we do not enter the driver on a non-referenced dev_t. Remove old D_NAG code, anonymous dev_t's are not a problem now. When destroy_dev() is called on a referenced dev_t, move it to dead_cdevsw's list. When the refcount drops, free it. Check that cdevsw->d_version is correct. If not, set all methods to the dead_*() methods to prevent entrance into driver. Print warning on console to this effect. The device driver may still explode if it is also incompatible with newbus, but in that case we probably didn't get this far in the first place.
2004-02-21 21:57:26 +00:00
static struct mtx devmtx;
static void freedev(dev_t dev);
static void
devlock(void)
{
if (!mtx_initialized(&devmtx))
mtx_init(&devmtx, "dev_t", NULL, MTX_DEF);
mtx_lock(&devmtx);
}
static void
devunlock(void)
{
mtx_unlock(&devmtx);
}
void
dev_ref(dev_t dev)
{
devlock();
dev->si_refcount++;
devunlock();
}
void
dev_rel(dev_t dev)
{
devlock();
dev->si_refcount--;
KASSERT(dev->si_refcount >= 0,
("dev_rel(%s) gave negative count", devtoname(dev)));
if (dev->si_devsw == NULL && dev->si_refcount == 0) {
LIST_REMOVE(dev, si_list);
freedev(dev);
}
devunlock();
}
void
cdevsw_ref(struct cdevsw *csw)
{
devlock();
csw->d_refcount++;
devunlock();
}
void
cdevsw_rel(struct cdevsw *csw)
{
devlock();
csw->d_refcount--;
KASSERT(csw->d_refcount >= 0,
("cdevsw_vrel(%s) gave negative count", csw->d_name));
devunlock();
}
Device megapatch 5/6: Remove the unused second argument from udev2dev(). Convert all remaining users of makedev() to use udev2dev(). The semantic difference is that udev2dev() will only locate a pre-existing dev_t, it will not line makedev() create a new one. Apart from the tiny well controlled windown in D_PSEUDO drivers, there should no longer be any "anonymous" dev_t's in the system now, only dev_t's created with make_dev() and make_dev_alias()
2004-02-21 21:32:15 +00:00
static dev_t makedev(int x, int y);
Introduce no_poll() default method for device drivers. Have it do exactly the same as vop_nopoll() for consistency and put a comment in the two pointing at each other. Retire seltrue() in favour of no_poll(). Create private default functions in kern_conf.c instead of public ones. Change default strategy to return the bio with ENODEV instead of doing nothing which would lead the bio stranded. Retire public nullopen() and nullclose() as well as the entire band of public no{read,write,ioctl,mmap,kqfilter,strategy,poll,dump} funtions, they are the default actions now. Move the final two trivial functions from subr_xxx.c to kern_conf.c and retire the now empty subr_xxx.c
2003-09-27 12:53:33 +00:00
int
nullop(void)
{
return (0);
}
int
eopnotsupp(void)
{
return (EOPNOTSUPP);
}
Add a dead_cdevsw which does its best to return ENXIO if at all possible. In devsw() return dead_cdevsw instead of NULL in case the dev_t does not have a si_devsw. This may improve our survival chances with devices which go away unexpectedly.
2003-02-20 15:35:54 +00:00
static int
enxio(void)
{
return (ENXIO);
}
Introduce no_poll() default method for device drivers. Have it do exactly the same as vop_nopoll() for consistency and put a comment in the two pointing at each other. Retire seltrue() in favour of no_poll(). Create private default functions in kern_conf.c instead of public ones. Change default strategy to return the bio with ENODEV instead of doing nothing which would lead the bio stranded. Retire public nullopen() and nullclose() as well as the entire band of public no{read,write,ioctl,mmap,kqfilter,strategy,poll,dump} funtions, they are the default actions now. Move the final two trivial functions from subr_xxx.c to kern_conf.c and retire the now empty subr_xxx.c
2003-09-27 12:53:33 +00:00
static int
enodev(void)
{
return (ENODEV);
}
/* Define a dead_cdevsw for use when devices leave unexpectedly. */
Add a dead_cdevsw which does its best to return ENXIO if at all possible. In devsw() return dead_cdevsw instead of NULL in case the dev_t does not have a si_devsw. This may improve our survival chances with devices which go away unexpectedly.
2003-02-20 15:35:54 +00:00
#define dead_open (d_open_t *)enxio
#define dead_close (d_close_t *)enxio
#define dead_read (d_read_t *)enxio
#define dead_write (d_write_t *)enxio
#define dead_ioctl (d_ioctl_t *)enxio
Introduce no_poll() default method for device drivers. Have it do exactly the same as vop_nopoll() for consistency and put a comment in the two pointing at each other. Retire seltrue() in favour of no_poll(). Create private default functions in kern_conf.c instead of public ones. Change default strategy to return the bio with ENODEV instead of doing nothing which would lead the bio stranded. Retire public nullopen() and nullclose() as well as the entire band of public no{read,write,ioctl,mmap,kqfilter,strategy,poll,dump} funtions, they are the default actions now. Move the final two trivial functions from subr_xxx.c to kern_conf.c and retire the now empty subr_xxx.c
2003-09-27 12:53:33 +00:00
#define dead_poll (d_poll_t *)enodev
#define dead_mmap (d_mmap_t *)enodev
Add a dead_cdevsw which does its best to return ENXIO if at all possible. In devsw() return dead_cdevsw instead of NULL in case the dev_t does not have a si_devsw. This may improve our survival chances with devices which go away unexpectedly.
2003-02-20 15:35:54 +00:00
static void
dead_strategy(struct bio *bp)
{
biofinish(bp, NULL, ENXIO);
}
NO_GEOM cleanup: Retire the "d_dump_t" and use the "dumper_t" type instead. Dumper_t takes a void * as first arg which is more general than the dev_t taken by d_dump_t. (Remember: we could have net-dumpers if somebody wrote us one!) Define the convention for GEOM controlled disk devices to be that the first argument to the dumper function is the struct disk pointer. Change device drivers accordingly.
2003-02-21 19:00:48 +00:00
#define dead_dump (dumper_t *)enxio
Add a dead_cdevsw which does its best to return ENXIO if at all possible. In devsw() return dead_cdevsw instead of NULL in case the dev_t does not have a si_devsw. This may improve our survival chances with devices which go away unexpectedly.
2003-02-20 15:35:54 +00:00
#define dead_kqfilter (d_kqfilter_t *)enxio
static struct cdevsw dead_cdevsw = {
Device megapatch 4/6: Introduce d_version field in struct cdevsw, this must always be initialized to D_VERSION. Flip sense of D_NOGIANT flag to D_NEEDGIANT, this involves removing four D_NOGIANT flags and adding 145 D_NEEDGIANT flags.
2004-02-21 21:10:55 +00:00
.d_version = D_VERSION,
.d_flags = D_NEEDGIANT, /* XXX: does dead_strategy need this ? */
Gigacommit to improve device-driver source compatibility between branches: Initialize struct cdevsw using C99 sparse initializtion and remove all initializations to default values. This patch is automatically generated and has been tested by compiling LINT with all the fields in struct cdevsw in reverse order on alpha, sparc64 and i386. Approved by: re(scottl)
2003-03-03 12:15:54 +00:00
.d_open = dead_open,
.d_close = dead_close,
.d_read = dead_read,
.d_write = dead_write,
.d_ioctl = dead_ioctl,
.d_poll = dead_poll,
.d_mmap = dead_mmap,
.d_strategy = dead_strategy,
.d_name = "dead",
.d_maj = 255,
.d_dump = dead_dump,
.d_kqfilter = dead_kqfilter
Add a dead_cdevsw which does its best to return ENXIO if at all possible. In devsw() return dead_cdevsw instead of NULL in case the dev_t does not have a si_devsw. This may improve our survival chances with devices which go away unexpectedly.
2003-02-20 15:35:54 +00:00
};
Introduce no_poll() default method for device drivers. Have it do exactly the same as vop_nopoll() for consistency and put a comment in the two pointing at each other. Retire seltrue() in favour of no_poll(). Create private default functions in kern_conf.c instead of public ones. Change default strategy to return the bio with ENODEV instead of doing nothing which would lead the bio stranded. Retire public nullopen() and nullclose() as well as the entire band of public no{read,write,ioctl,mmap,kqfilter,strategy,poll,dump} funtions, they are the default actions now. Move the final two trivial functions from subr_xxx.c to kern_conf.c and retire the now empty subr_xxx.c
2003-09-27 12:53:33 +00:00
/* Default methods if driver does not specify method */
#define null_open (d_open_t *)nullop
#define null_close (d_close_t *)nullop
#define no_read (d_read_t *)enodev
#define no_write (d_write_t *)enodev
#define no_ioctl (d_ioctl_t *)enodev
#define no_mmap (d_mmap_t *)enodev
static int
no_kqfilter(dev_t dev __unused, struct knote *kn __unused)
{
return (1);
}
static void
no_strategy(struct bio *bp)
{
biofinish(bp, NULL, ENODEV);
}
static int
no_poll(dev_t dev __unused, int events, struct thread *td __unused)
{
/*
* Return true for read/write. If the user asked for something
* special, return POLLNVAL, so that clients have a way of
* determining reliably whether or not the extended
* functionality is present without hard-coding knowledge
* of specific filesystem implementations.
* Stay in sync with vop_nopoll().
*/
if (events & ~POLLSTANDARD)
return (POLLNVAL);
return (events & (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM));
}
#define no_dump (dumper_t *)enodev
Nudge the axe a bit closer to cdevsw[]: Make it a panic to repeat make_dev() or destroy_dev(), this check should maybe be neutered when -current goes -stable. Whine if devsw() is called on anon dev_t's in a devfs system. Make a hack to avoid our lazy-eval disk code triggering the above whine. Fix the multiple make_dev() in disk code by making ${disk}${unit}s${slice} an alias/symlink to ${disk}${unit}s${slice}c
2001-10-27 17:44:21 +00:00
Simplify cdevsw registration. The cdevsw_add() function now finds the major number(s) in the struct cdevsw passed to it. cdevsw_add_generic() is no longer needed, cdevsw_add() does the same thing. cdevsw_add() will print an message if the d_maj field looks bogus. Remove nblkdev and nchrdev variables. Most places they were used bogusly. Instead check a dev_t for validity by seeing if devsw() or bdevsw() returns NULL. Move bdevsw() and devsw() functions to kern/kern_conf.c Bump __FreeBSD_version to 400006 This commit removes: 72 bogus makedev() calls 26 bogus SYSINIT functions if_xe.c bogusly accessed cdevsw[], author/maintainer please fix. I4b and vinum not changed. Patches emailed to authors. LINT probably broken until they catch up.
1999-05-31 11:29:30 +00:00
struct cdevsw *
devsw(dev_t dev)
A little step further in the dev_t cleanups: Refuse to register a bmajor if the D_DISK flag is not set in cdevsw. A little bit of cleanup while here.
1999-10-04 11:42:41 +00:00
{
Device megapatch 6/6: This is what we came here for: Hang dev_t's from their cdevsw, refcount cdevsw and dev_t and generally keep track of things a lot better than we used to: Hold a cdevsw reference around all entrances into the device driver, this will be necessary to safely determine when we can unload driver code. Hold a dev_t reference while the device is open. KASSERT that we do not enter the driver on a non-referenced dev_t. Remove old D_NAG code, anonymous dev_t's are not a problem now. When destroy_dev() is called on a referenced dev_t, move it to dead_cdevsw's list. When the refcount drops, free it. Check that cdevsw->d_version is correct. If not, set all methods to the dead_*() methods to prevent entrance into driver. Print warning on console to this effect. The device driver may still explode if it is also incompatible with newbus, but in that case we probably didn't get this far in the first place.
2004-02-21 21:57:26 +00:00
if (dev->si_devsw != NULL)
The bdevsw() and cdevsw() are now identical, so kill the former.
1999-08-13 10:29:38 +00:00
return (dev->si_devsw);
Add a dead_cdevsw which does its best to return ENXIO if at all possible. In devsw() return dead_cdevsw instead of NULL in case the dev_t does not have a si_devsw. This may improve our survival chances with devices which go away unexpectedly.
2003-02-20 15:35:54 +00:00
return (&dead_cdevsw);
Simplify cdevsw registration. The cdevsw_add() function now finds the major number(s) in the struct cdevsw passed to it. cdevsw_add_generic() is no longer needed, cdevsw_add() does the same thing. cdevsw_add() will print an message if the d_maj field looks bogus. Remove nblkdev and nchrdev variables. Most places they were used bogusly. Instead check a dev_t for validity by seeing if devsw() or bdevsw() returns NULL. Move bdevsw() and devsw() functions to kern/kern_conf.c Bump __FreeBSD_version to 400006 This commit removes: 72 bogus makedev() calls 26 bogus SYSINIT functions if_xe.c bogusly accessed cdevsw[], author/maintainer please fix. I4b and vinum not changed. Patches emailed to authors. LINT probably broken until they catch up.
1999-05-31 11:29:30 +00:00
}
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 and u_dev_t primitives
*/
A little step further in the dev_t cleanups: Refuse to register a bmajor if the D_DISK flag is not set in cdevsw. A little bit of cleanup while here.
1999-10-04 11:42:41 +00:00
int
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
major(dev_t x)
{
Now a dev_t is a pointer to struct specinfo which is shared by all specdev vnodes referencing this device. Details: cdevsw->d_parms has been removed, the specinfo is available now (== dev_t) and the driver should modify it directly when applicable, and the only driver doing so, does so: vn.c. I am not sure the logic in checking for "<" was right before, and it looks even less so now. An intial pool of 50 struct specinfo are depleted during early boot, after that malloc had better work. It is likely that fewer than 50 would do. Hashing is done from udev_t to dev_t with a prime number remainder hash, experiments show no better hash available for decent cost (MD5 is only marginally better) The prime number used should not be close to a power of two, we use 83 for now. Add new checkalias2() to get around the loss of info from dev2udev() in bdevvp(); The aliased vnodes are hung on a list straight of the dev_t, and speclisth[SPECSZ] is unused. The sharing of struct specinfo means that the v_specnext moves into the vnode which grows by 4 bytes. Don't use a VBLK dev_t which doesn't make sense in MFS, now we hang a dummy cdevsw on B/Cmaj 253 so that things look sane. Storage overhead from all of this is O(50k). Bump __FreeBSD_version to 400009 The next step will add the stuff needed so device-drivers can start to hang things from struct specinfo
1999-07-20 09:47:55 +00:00
if (x == NODEV)
return NOUDEV;
return((x->si_udev >> 8) & 0xff);
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
minor(dev_t x)
{
Now a dev_t is a pointer to struct specinfo which is shared by all specdev vnodes referencing this device. Details: cdevsw->d_parms has been removed, the specinfo is available now (== dev_t) and the driver should modify it directly when applicable, and the only driver doing so, does so: vn.c. I am not sure the logic in checking for "<" was right before, and it looks even less so now. An intial pool of 50 struct specinfo are depleted during early boot, after that malloc had better work. It is likely that fewer than 50 would do. Hashing is done from udev_t to dev_t with a prime number remainder hash, experiments show no better hash available for decent cost (MD5 is only marginally better) The prime number used should not be close to a power of two, we use 83 for now. Add new checkalias2() to get around the loss of info from dev2udev() in bdevvp(); The aliased vnodes are hung on a list straight of the dev_t, and speclisth[SPECSZ] is unused. The sharing of struct specinfo means that the v_specnext moves into the vnode which grows by 4 bytes. Don't use a VBLK dev_t which doesn't make sense in MFS, now we hang a dummy cdevsw on B/Cmaj 253 so that things look sane. Storage overhead from all of this is O(50k). Bump __FreeBSD_version to 400009 The next step will add the stuff needed so device-drivers can start to hang things from struct specinfo
1999-07-20 09:47:55 +00:00
if (x == NODEV)
return NOUDEV;
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
}
Introduce lminor(dev_t dev), which returns a linear minor number, ie: hides the fact that the major number is stuck in the middle.
1999-08-15 09:32:47 +00:00
int
Rename lminor() to dev2unit(). This function gives a linear unit number which hides the 'hole' in the minor bits. Introduce unit2minor() to do the reverse operation. Fix some some make_dev() calls which didn't use UID_* or GID_* macros. Kill the v_hashchain alias macro, it hides the real relationship. Introduce experimental SI_CHEAPCLONE flag set it on cloned bpfs.
2000-09-19 10:28:44 +00:00
dev2unit(dev_t x)
Introduce lminor(dev_t dev), which returns a linear minor number, ie: hides the fact that the major number is stuck in the middle.
1999-08-15 09:32:47 +00:00
{
int i;
if (x == NODEV)
return NOUDEV;
i = minor(x);
return ((i & 0xff) | (i >> 8));
}
Rename lminor() to dev2unit(). This function gives a linear unit number which hides the 'hole' in the minor bits. Introduce unit2minor() to do the reverse operation. Fix some some make_dev() calls which didn't use UID_* or GID_* macros. Kill the v_hashchain alias macro, it hides the real relationship. Introduce experimental SI_CHEAPCLONE flag set it on cloned bpfs.
2000-09-19 10:28:44 +00:00
int
unit2minor(int unit)
{
Add a KASSERT on unit2minor() so that we catch it if people try to pass us unit numbers which doesn't fit in 24 bits.
2001-03-20 13:24:24 +00:00
KASSERT(unit <= 0xffffff, ("Invalid unit (%d) in unit2minor", unit));
Rename lminor() to dev2unit(). This function gives a linear unit number which hides the 'hole' in the minor bits. Introduce unit2minor() to do the reverse operation. Fix some some make_dev() calls which didn't use UID_* or GID_* macros. Kill the v_hashchain alias macro, it hides the real relationship. Introduce experimental SI_CHEAPCLONE flag set it on cloned bpfs.
2000-09-19 10:28:44 +00:00
return ((unit & 0xff) | ((unit << 8) & ~0xffff));
}
Remove all traces of Julians DEVFS (incl from kern/subr_diskslice.c) Remove old DEVFS support fields from dev_t. Make uid, gid & mode members of dev_t and set them in make_dev(). Use correct uid, gid & mode in make_dev in disk minilayer. Add support for registering alias names for a dev_t using the new function make_dev_alias(). These will show up as symlinks in DEVFS. Use makedev() rather than make_dev() for MFSs magic devices to prevent DEVFS from noticing this abuse. Add a field for DEVFS inode number in dev_t. Add new DEVFS in fs/devfs. Add devfs cloning to: disk minilayer (ie: ad(4), sd(4), cd(4) etc etc) md(4), tun(4), bpf(4), fd(4) If DEVFS add -d flag to /sbin/inits args to make it mount devfs. Add commented out DEVFS to GENERIC
2000-08-20 21:34:39 +00:00
static dev_t
allocdev(void)
{
static int stashed;
Rename struct specinfo to the more appropriate struct cdev. Agreed on: jake, rwatson, jhb
2002-09-27 18:27:10 +00:00
struct cdev *si;
Remove all traces of Julians DEVFS (incl from kern/subr_diskslice.c) Remove old DEVFS support fields from dev_t. Make uid, gid & mode members of dev_t and set them in make_dev(). Use correct uid, gid & mode in make_dev in disk minilayer. Add support for registering alias names for a dev_t using the new function make_dev_alias(). These will show up as symlinks in DEVFS. Use makedev() rather than make_dev() for MFSs magic devices to prevent DEVFS from noticing this abuse. Add a field for DEVFS inode number in dev_t. Add new DEVFS in fs/devfs. Add devfs cloning to: disk minilayer (ie: ad(4), sd(4), cd(4) etc etc) md(4), tun(4), bpf(4), fd(4) If DEVFS add -d flag to /sbin/inits args to make it mount devfs. Add commented out DEVFS to GENERIC
2000-08-20 21:34:39 +00:00
Fix a logic bug in the struct dev_t allocation code. Spotted by: Neelkanth Natu <neelnatu@yahoo.com>
2002-09-08 15:15:12 +00:00
if (LIST_FIRST(&dev_free)) {
Remove all traces of Julians DEVFS (incl from kern/subr_diskslice.c) Remove old DEVFS support fields from dev_t. Make uid, gid & mode members of dev_t and set them in make_dev(). Use correct uid, gid & mode in make_dev in disk minilayer. Add support for registering alias names for a dev_t using the new function make_dev_alias(). These will show up as symlinks in DEVFS. Use makedev() rather than make_dev() for MFSs magic devices to prevent DEVFS from noticing this abuse. Add a field for DEVFS inode number in dev_t. Add new DEVFS in fs/devfs. Add devfs cloning to: disk minilayer (ie: ad(4), sd(4), cd(4) etc etc) md(4), tun(4), bpf(4), fd(4) If DEVFS add -d flag to /sbin/inits args to make it mount devfs. Add commented out DEVFS to GENERIC
2000-08-20 21:34:39 +00:00
si = LIST_FIRST(&dev_free);
Fix two oversights here: don't trash the freelist, and properly cleanup the cdevsw{}. Submitted by: tegge
2004-02-23 08:42:55 +00:00
LIST_REMOVE(si, si_hash);
Fix a logic bug in the struct dev_t allocation code. Spotted by: Neelkanth Natu <neelnatu@yahoo.com>
2002-09-08 15:15:12 +00:00
} else if (stashed >= DEVT_STASH) {
Rename struct specinfo to the more appropriate struct cdev. Agreed on: jake, rwatson, jhb
2002-09-27 18:27:10 +00:00
MALLOC(si, struct cdev *, sizeof(*si), M_DEVT,
Add M_WAITOK
2003-02-19 22:51:33 +00:00
M_USE_RESERVE | M_ZERO | M_WAITOK);
Remove all traces of Julians DEVFS (incl from kern/subr_diskslice.c) Remove old DEVFS support fields from dev_t. Make uid, gid & mode members of dev_t and set them in make_dev(). Use correct uid, gid & mode in make_dev in disk minilayer. Add support for registering alias names for a dev_t using the new function make_dev_alias(). These will show up as symlinks in DEVFS. Use makedev() rather than make_dev() for MFSs magic devices to prevent DEVFS from noticing this abuse. Add a field for DEVFS inode number in dev_t. Add new DEVFS in fs/devfs. Add devfs cloning to: disk minilayer (ie: ad(4), sd(4), cd(4) etc etc) md(4), tun(4), bpf(4), fd(4) If DEVFS add -d flag to /sbin/inits args to make it mount devfs. Add commented out DEVFS to GENERIC
2000-08-20 21:34:39 +00:00
} else {
si = devt_stash + stashed++;
Create a general facility for making dev_t's depend on another dev_t. The dev_depends(dev_t, dev_t) function is for tying them to each other. When destroy_dev() is called on a dev_t, all dev_t's depending on it will also be destroyed (depth first order). Rewrite the make_dev_alias() to use this dependency facility. kern/subr_disk.c: Make the disk mini-layer use dependencies to make sure all relevant dev_t's are removed when the disk disappears. Make the disk mini-layer precreate some magic sub devices which the disk/slice/label code expects to be there. kern/subr_disklabel.c: Remove some now unneeded variables. kern/subr_diskmbr.c: Remove some ancient, commented out code. kern/subr_diskslice.c: Minor cleanup. Use name from dev_t instead of dsname()
2001-05-26 08:27:58 +00:00
bzero(si, sizeof *si);
Fix a logic bug in the struct dev_t allocation code. Spotted by: Neelkanth Natu <neelnatu@yahoo.com>
2002-09-08 15:15:12 +00:00
si->si_flags |= SI_STASHED;
Remove all traces of Julians DEVFS (incl from kern/subr_diskslice.c) Remove old DEVFS support fields from dev_t. Make uid, gid & mode members of dev_t and set them in make_dev(). Use correct uid, gid & mode in make_dev in disk minilayer. Add support for registering alias names for a dev_t using the new function make_dev_alias(). These will show up as symlinks in DEVFS. Use makedev() rather than make_dev() for MFSs magic devices to prevent DEVFS from noticing this abuse. Add a field for DEVFS inode number in dev_t. Add new DEVFS in fs/devfs. Add devfs cloning to: disk minilayer (ie: ad(4), sd(4), cd(4) etc etc) md(4), tun(4), bpf(4), fd(4) If DEVFS add -d flag to /sbin/inits args to make it mount devfs. Add commented out DEVFS to GENERIC
2000-08-20 21:34:39 +00:00
}
Pave the road to removing the fixed size limit on device nodes: Change the si_name of dev_t's to be a char * and put a private buffer for holding the name at then end of the struct. Initialize si_name to point to the private buffer. Put a KASSERT in geom_disk to prevent overrun on the fake dev_t we still have to generate for the disk_drivers.
2003-02-04 10:32:40 +00:00
si->__si_namebuf[0] = '\0';
si->si_name = si->__si_namebuf;
Create a general facility for making dev_t's depend on another dev_t. The dev_depends(dev_t, dev_t) function is for tying them to each other. When destroy_dev() is called on a dev_t, all dev_t's depending on it will also be destroyed (depth first order). Rewrite the make_dev_alias() to use this dependency facility. kern/subr_disk.c: Make the disk mini-layer use dependencies to make sure all relevant dev_t's are removed when the disk disappears. Make the disk mini-layer precreate some magic sub devices which the disk/slice/label code expects to be there. kern/subr_disklabel.c: Remove some now unneeded variables. kern/subr_diskmbr.c: Remove some ancient, commented out code. kern/subr_diskslice.c: Minor cleanup. Use name from dev_t instead of dsname()
2001-05-26 08:27:58 +00:00
LIST_INIT(&si->si_children);
Fixes to track snapshot copy-on-write checking in the specinfo structure rather than assuming that the device vnode would reside in the FFS filesystem (which is obviously a broken assumption with the device filesystem).
2001-03-07 07:09:55 +00:00
TAILQ_INIT(&si->si_snapshots);
Remove all traces of Julians DEVFS (incl from kern/subr_diskslice.c) Remove old DEVFS support fields from dev_t. Make uid, gid & mode members of dev_t and set them in make_dev(). Use correct uid, gid & mode in make_dev in disk minilayer. Add support for registering alias names for a dev_t using the new function make_dev_alias(). These will show up as symlinks in DEVFS. Use makedev() rather than make_dev() for MFSs magic devices to prevent DEVFS from noticing this abuse. Add a field for DEVFS inode number in dev_t. Add new DEVFS in fs/devfs. Add devfs cloning to: disk minilayer (ie: ad(4), sd(4), cd(4) etc etc) md(4), tun(4), bpf(4), fd(4) If DEVFS add -d flag to /sbin/inits args to make it mount devfs. Add commented out DEVFS to GENERIC
2000-08-20 21:34:39 +00:00
return (si);
}
Device megapatch 5/6: Remove the unused second argument from udev2dev(). Convert all remaining users of makedev() to use udev2dev(). The semantic difference is that udev2dev() will only locate a pre-existing dev_t, it will not line makedev() create a new one. Apart from the tiny well controlled windown in D_PSEUDO drivers, there should no longer be any "anonymous" dev_t's in the system now, only dev_t's created with make_dev() and make_dev_alias()
2004-02-21 21:32:15 +00:00
static dev_t
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
makedev(int x, int y)
{
Rename struct specinfo to the more appropriate struct cdev. Agreed on: jake, rwatson, jhb
2002-09-27 18:27:10 +00:00
struct cdev *si;
Now a dev_t is a pointer to struct specinfo which is shared by all specdev vnodes referencing this device. Details: cdevsw->d_parms has been removed, the specinfo is available now (== dev_t) and the driver should modify it directly when applicable, and the only driver doing so, does so: vn.c. I am not sure the logic in checking for "<" was right before, and it looks even less so now. An intial pool of 50 struct specinfo are depleted during early boot, after that malloc had better work. It is likely that fewer than 50 would do. Hashing is done from udev_t to dev_t with a prime number remainder hash, experiments show no better hash available for decent cost (MD5 is only marginally better) The prime number used should not be close to a power of two, we use 83 for now. Add new checkalias2() to get around the loss of info from dev2udev() in bdevvp(); The aliased vnodes are hung on a list straight of the dev_t, and speclisth[SPECSZ] is unused. The sharing of struct specinfo means that the v_specnext moves into the vnode which grows by 4 bytes. Don't use a VBLK dev_t which doesn't make sense in MFS, now we hang a dummy cdevsw on B/Cmaj 253 so that things look sane. Storage overhead from all of this is O(50k). Bump __FreeBSD_version to 400009 The next step will add the stuff needed so device-drivers can start to hang things from struct specinfo
1999-07-20 09:47:55 +00:00
udev_t udev;
int hash;
Be more careful about NOUDEV and NODEV. Submitted by: bde
2000-01-04 12:51:50 +00:00
if (x == umajor(NOUDEV) && y == uminor(NOUDEV))
Convert a Debugger(3) to a panic(9) and a EINVAL. Reminded by: bde
2001-01-21 21:19:49 +00:00
panic("makedev of NOUDEV");
Now a dev_t is a pointer to struct specinfo which is shared by all specdev vnodes referencing this device. Details: cdevsw->d_parms has been removed, the specinfo is available now (== dev_t) and the driver should modify it directly when applicable, and the only driver doing so, does so: vn.c. I am not sure the logic in checking for "<" was right before, and it looks even less so now. An intial pool of 50 struct specinfo are depleted during early boot, after that malloc had better work. It is likely that fewer than 50 would do. Hashing is done from udev_t to dev_t with a prime number remainder hash, experiments show no better hash available for decent cost (MD5 is only marginally better) The prime number used should not be close to a power of two, we use 83 for now. Add new checkalias2() to get around the loss of info from dev2udev() in bdevvp(); The aliased vnodes are hung on a list straight of the dev_t, and speclisth[SPECSZ] is unused. The sharing of struct specinfo means that the v_specnext moves into the vnode which grows by 4 bytes. Don't use a VBLK dev_t which doesn't make sense in MFS, now we hang a dummy cdevsw on B/Cmaj 253 so that things look sane. Storage overhead from all of this is O(50k). Bump __FreeBSD_version to 400009 The next step will add the stuff needed so device-drivers can start to hang things from struct specinfo
1999-07-20 09:47:55 +00:00
udev = (x << 8) | y;
hash = udev % DEVT_HASH;
Add dev_t freeing code. Controlled by sysctl debug.free_devt, default is off.
1999-08-29 09:09:12 +00:00
LIST_FOREACH(si, &dev_hash[hash], si_hash) {
Now a dev_t is a pointer to struct specinfo which is shared by all specdev vnodes referencing this device. Details: cdevsw->d_parms has been removed, the specinfo is available now (== dev_t) and the driver should modify it directly when applicable, and the only driver doing so, does so: vn.c. I am not sure the logic in checking for "<" was right before, and it looks even less so now. An intial pool of 50 struct specinfo are depleted during early boot, after that malloc had better work. It is likely that fewer than 50 would do. Hashing is done from udev_t to dev_t with a prime number remainder hash, experiments show no better hash available for decent cost (MD5 is only marginally better) The prime number used should not be close to a power of two, we use 83 for now. Add new checkalias2() to get around the loss of info from dev2udev() in bdevvp(); The aliased vnodes are hung on a list straight of the dev_t, and speclisth[SPECSZ] is unused. The sharing of struct specinfo means that the v_specnext moves into the vnode which grows by 4 bytes. Don't use a VBLK dev_t which doesn't make sense in MFS, now we hang a dummy cdevsw on B/Cmaj 253 so that things look sane. Storage overhead from all of this is O(50k). Bump __FreeBSD_version to 400009 The next step will add the stuff needed so device-drivers can start to hang things from struct specinfo
1999-07-20 09:47:55 +00:00
if (si->si_udev == udev)
return (si);
}
Remove all traces of Julians DEVFS (incl from kern/subr_diskslice.c) Remove old DEVFS support fields from dev_t. Make uid, gid & mode members of dev_t and set them in make_dev(). Use correct uid, gid & mode in make_dev in disk minilayer. Add support for registering alias names for a dev_t using the new function make_dev_alias(). These will show up as symlinks in DEVFS. Use makedev() rather than make_dev() for MFSs magic devices to prevent DEVFS from noticing this abuse. Add a field for DEVFS inode number in dev_t. Add new DEVFS in fs/devfs. Add devfs cloning to: disk minilayer (ie: ad(4), sd(4), cd(4) etc etc) md(4), tun(4), bpf(4), fd(4) If DEVFS add -d flag to /sbin/inits args to make it mount devfs. Add commented out DEVFS to GENERIC
2000-08-20 21:34:39 +00:00
si = allocdev();
Now a dev_t is a pointer to struct specinfo which is shared by all specdev vnodes referencing this device. Details: cdevsw->d_parms has been removed, the specinfo is available now (== dev_t) and the driver should modify it directly when applicable, and the only driver doing so, does so: vn.c. I am not sure the logic in checking for "<" was right before, and it looks even less so now. An intial pool of 50 struct specinfo are depleted during early boot, after that malloc had better work. It is likely that fewer than 50 would do. Hashing is done from udev_t to dev_t with a prime number remainder hash, experiments show no better hash available for decent cost (MD5 is only marginally better) The prime number used should not be close to a power of two, we use 83 for now. Add new checkalias2() to get around the loss of info from dev2udev() in bdevvp(); The aliased vnodes are hung on a list straight of the dev_t, and speclisth[SPECSZ] is unused. The sharing of struct specinfo means that the v_specnext moves into the vnode which grows by 4 bytes. Don't use a VBLK dev_t which doesn't make sense in MFS, now we hang a dummy cdevsw on B/Cmaj 253 so that things look sane. Storage overhead from all of this is O(50k). Bump __FreeBSD_version to 400009 The next step will add the stuff needed so device-drivers can start to hang things from struct specinfo
1999-07-20 09:47:55 +00:00
si->si_udev = udev;
Add dev_t freeing code. Controlled by sysctl debug.free_devt, default is off.
1999-08-29 09:09:12 +00:00
LIST_INSERT_HEAD(&dev_hash[hash], si, si_hash);
Fixed style bugs near previous commit (mainly formatting errors and missing parentheses). Use default handling (trap to debugger) for udev2dev(x, 1) since it is an error and doesn't happen anywhere in the sys tree except in bogusly commented out code in coda.
2004-02-15 20:14:47 +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
}
Device megapatch 6/6: This is what we came here for: Hang dev_t's from their cdevsw, refcount cdevsw and dev_t and generally keep track of things a lot better than we used to: Hold a cdevsw reference around all entrances into the device driver, this will be necessary to safely determine when we can unload driver code. Hold a dev_t reference while the device is open. KASSERT that we do not enter the driver on a non-referenced dev_t. Remove old D_NAG code, anonymous dev_t's are not a problem now. When destroy_dev() is called on a referenced dev_t, move it to dead_cdevsw's list. When the refcount drops, free it. Check that cdevsw->d_version is correct. If not, set all methods to the dead_*() methods to prevent entrance into driver. Print warning on console to this effect. The device driver may still explode if it is also incompatible with newbus, but in that case we probably didn't get this far in the first place.
2004-02-21 21:57:26 +00:00
static void
Add dev_t freeing code. Controlled by sysctl debug.free_devt, default is off.
1999-08-29 09:09:12 +00:00
freedev(dev_t dev)
{
if (dev->si_flags & SI_STASHED) {
bzero(dev, sizeof(*dev));
Create a general facility for making dev_t's depend on another dev_t. The dev_depends(dev_t, dev_t) function is for tying them to each other. When destroy_dev() is called on a dev_t, all dev_t's depending on it will also be destroyed (depth first order). Rewrite the make_dev_alias() to use this dependency facility. kern/subr_disk.c: Make the disk mini-layer use dependencies to make sure all relevant dev_t's are removed when the disk disappears. Make the disk mini-layer precreate some magic sub devices which the disk/slice/label code expects to be there. kern/subr_disklabel.c: Remove some now unneeded variables. kern/subr_diskmbr.c: Remove some ancient, commented out code. kern/subr_diskslice.c: Minor cleanup. Use name from dev_t instead of dsname()
2001-05-26 08:27:58 +00:00
dev->si_flags |= SI_STASHED;
Add dev_t freeing code. Controlled by sysctl debug.free_devt, default is off.
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)
{
Now a dev_t is a pointer to struct specinfo which is shared by all specdev vnodes referencing this device. Details: cdevsw->d_parms has been removed, the specinfo is available now (== dev_t) and the driver should modify it directly when applicable, and the only driver doing so, does so: vn.c. I am not sure the logic in checking for "<" was right before, and it looks even less so now. An intial pool of 50 struct specinfo are depleted during early boot, after that malloc had better work. It is likely that fewer than 50 would do. Hashing is done from udev_t to dev_t with a prime number remainder hash, experiments show no better hash available for decent cost (MD5 is only marginally better) The prime number used should not be close to a power of two, we use 83 for now. Add new checkalias2() to get around the loss of info from dev2udev() in bdevvp(); The aliased vnodes are hung on a list straight of the dev_t, and speclisth[SPECSZ] is unused. The sharing of struct specinfo means that the v_specnext moves into the vnode which grows by 4 bytes. Don't use a VBLK dev_t which doesn't make sense in MFS, now we hang a dummy cdevsw on B/Cmaj 253 so that things look sane. Storage overhead from all of this is O(50k). Bump __FreeBSD_version to 400009 The next step will add the stuff needed so device-drivers can start to hang things from struct specinfo
1999-07-20 09:47:55 +00:00
if (x == NODEV)
Fixed style bugs near previous commit (mainly formatting errors and missing parentheses). Use default handling (trap to debugger) for udev2dev(x, 1) since it is an error and doesn't happen anywhere in the sys tree except in bogusly commented out code in coda.
2004-02-15 20:14:47 +00:00
return (NOUDEV);
Now a dev_t is a pointer to struct specinfo which is shared by all specdev vnodes referencing this device. Details: cdevsw->d_parms has been removed, the specinfo is available now (== dev_t) and the driver should modify it directly when applicable, and the only driver doing so, does so: vn.c. I am not sure the logic in checking for "<" was right before, and it looks even less so now. An intial pool of 50 struct specinfo are depleted during early boot, after that malloc had better work. It is likely that fewer than 50 would do. Hashing is done from udev_t to dev_t with a prime number remainder hash, experiments show no better hash available for decent cost (MD5 is only marginally better) The prime number used should not be close to a power of two, we use 83 for now. Add new checkalias2() to get around the loss of info from dev2udev() in bdevvp(); The aliased vnodes are hung on a list straight of the dev_t, and speclisth[SPECSZ] is unused. The sharing of struct specinfo means that the v_specnext moves into the vnode which grows by 4 bytes. Don't use a VBLK dev_t which doesn't make sense in MFS, now we hang a dummy cdevsw on B/Cmaj 253 so that things look sane. Storage overhead from all of this is O(50k). Bump __FreeBSD_version to 400009 The next step will add the stuff needed so device-drivers can start to hang things from struct specinfo
1999-07-20 09:47:55 +00:00
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
Device megapatch 5/6: Remove the unused second argument from udev2dev(). Convert all remaining users of makedev() to use udev2dev(). The semantic difference is that udev2dev() will only locate a pre-existing dev_t, it will not line makedev() create a new one. Apart from the tiny well controlled windown in D_PSEUDO drivers, there should no longer be any "anonymous" dev_t's in the system now, only dev_t's created with make_dev() and make_dev_alias()
2004-02-21 21:32:15 +00:00
udev2dev(udev_t 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
{
Device megapatch 5/6: Remove the unused second argument from udev2dev(). Convert all remaining users of makedev() to use udev2dev(). The semantic difference is that udev2dev() will only locate a pre-existing dev_t, it will not line makedev() create a new one. Apart from the tiny well controlled windown in D_PSEUDO drivers, there should no longer be any "anonymous" dev_t's in the system now, only dev_t's created with make_dev() and make_dev_alias()
2004-02-21 21:32:15 +00:00
struct cdev *si;
int hash;
Be more careful about NOUDEV and NODEV. Submitted by: bde
2000-01-04 12:51:50 +00:00
Device megapatch 5/6: Remove the unused second argument from udev2dev(). Convert all remaining users of makedev() to use udev2dev(). The semantic difference is that udev2dev() will only locate a pre-existing dev_t, it will not line makedev() create a new one. Apart from the tiny well controlled windown in D_PSEUDO drivers, there should no longer be any "anonymous" dev_t's in the system now, only dev_t's created with make_dev() and make_dev_alias()
2004-02-21 21:32:15 +00:00
if (udev == NOUDEV)
Fixed style bugs near previous commit (mainly formatting errors and missing parentheses). Use default handling (trap to debugger) for udev2dev(x, 1) since it is an error and doesn't happen anywhere in the sys tree except in bogusly commented out code in coda.
2004-02-15 20:14:47 +00:00
return (NODEV);
Device megapatch 5/6: Remove the unused second argument from udev2dev(). Convert all remaining users of makedev() to use udev2dev(). The semantic difference is that udev2dev() will only locate a pre-existing dev_t, it will not line makedev() create a new one. Apart from the tiny well controlled windown in D_PSEUDO drivers, there should no longer be any "anonymous" dev_t's in the system now, only dev_t's created with make_dev() and make_dev_alias()
2004-02-21 21:32:15 +00:00
hash = udev % DEVT_HASH;
LIST_FOREACH(si, &dev_hash[hash], si_hash) {
if (si->si_udev == udev)
return (si);
Use 256 as magic in bmaj2cmaj[]. Treat BLK/CHR dev_t more correctly.
1999-07-17 19:57:25 +00:00
}
Device megapatch 5/6: Remove the unused second argument from udev2dev(). Convert all remaining users of makedev() to use udev2dev(). The semantic difference is that udev2dev() will only locate a pre-existing dev_t, it will not line makedev() create a new one. Apart from the tiny well controlled windown in D_PSEUDO drivers, there should no longer be any "anonymous" dev_t's in the system now, only dev_t's created with make_dev() and make_dev_alias()
2004-02-21 21:32:15 +00:00
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)
{
Fixed style bugs near previous commit (mainly formatting errors and missing parentheses). Use default handling (trap to debugger) for udev2dev(x, 1) since it is an error and doesn't happen anywhere in the sys tree except in bogusly commented out code in coda.
2004-02-15 20:14:47 +00:00
return (dev & 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
}
int
umajor(udev_t dev)
{
Fixed style bugs near previous commit (mainly formatting errors and missing parentheses). Use default handling (trap to debugger) for udev2dev(x, 1) since it is an error and doesn't happen anywhere in the sys tree except in bogusly commented out code in coda.
2004-02-15 20:14:47 +00:00
return ((dev & 0xff00) >> 8);
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
I have not one single time remembered the name of this function correctly so obviously I gave it the wrong name. s/umakedev/makeudev/g
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
{
Fixed style bugs near previous commit (mainly formatting errors and missing parentheses). Use default handling (trap to debugger) for udev2dev(x, 1) since it is an error and doesn't happen anywhere in the sys tree except in bogusly commented out code in coda.
2004-02-15 20:14:47 +00:00
return ((x << 8) | 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
}
Split the initialization of the cdevsw into a separate function.
2004-02-15 10:35:33 +00:00
static void
Device megapatch 2/6: This commit adds a couple of functions for pseudodrivers to use for implementing cloning in a manner we will be able to lock down (shortly). Basically what happens is that pseudo drivers get a way to ask for "give me the dev_t with this unit number" or alternatively "give me a dev_t with the lowest guaranteed free unit number" (there is unfortunately a lot of non-POLA in the exact numeric value of this number, just live with it for now) Managing the unit number space this way removes the need to use rman(9) to do so in the drivers this greatly simplifies the code in the drivers because even using rman(9) they still needed to manage their dev_t's anyway. I have taken the if_tun, if_tap, snp and nmdm drivers through the mill, partly because they (ab)used makedev(), but mostly because together they represent three different problems for device-cloning: if_tun and snp is the plain case: just give me a device. if_tap has two kinds of devices, with a flag for device type. nmdm has paired devices (ala pty) can you can clone either of them.
2004-02-21 20:29:52 +00:00
find_major(struct cdevsw *devsw)
Decommision miscfs/specfs/specdev.h. Most of it goes into <sys/conf.h>, a few lines into <sys/vnode.h>. Add a few fields to struct specinfo, paving the way for the fun part.
1999-08-08 18:43:05 +00:00
{
int i;
Device megapatch 2/6: This commit adds a couple of functions for pseudodrivers to use for implementing cloning in a manner we will be able to lock down (shortly). Basically what happens is that pseudo drivers get a way to ask for "give me the dev_t with this unit number" or alternatively "give me a dev_t with the lowest guaranteed free unit number" (there is unfortunately a lot of non-POLA in the exact numeric value of this number, just live with it for now) Managing the unit number space this way removes the need to use rman(9) to do so in the drivers this greatly simplifies the code in the drivers because even using rman(9) they still needed to manage their dev_t's anyway. I have taken the if_tun, if_tap, snp and nmdm drivers through the mill, partly because they (ab)used makedev(), but mostly because together they represent three different problems for device-cloning: if_tun and snp is the plain case: just give me a device. if_tap has two kinds of devices, with a flag for device type. nmdm has paired devices (ala pty) can you can clone either of them.
2004-02-21 20:29:52 +00:00
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;
Device megapatch 6/6: This is what we came here for: Hang dev_t's from their cdevsw, refcount cdevsw and dev_t and generally keep track of things a lot better than we used to: Hold a cdevsw reference around all entrances into the device driver, this will be necessary to safely determine when we can unload driver code. Hold a dev_t reference while the device is open. KASSERT that we do not enter the driver on a non-referenced dev_t. Remove old D_NAG code, anonymous dev_t's are not a problem now. When destroy_dev() is called on a referenced dev_t, move it to dead_cdevsw's list. When the refcount drops, free it. Check that cdevsw->d_version is correct. If not, set all methods to the dead_*() methods to prevent entrance into driver. Print warning on console to this effect. The device driver may still explode if it is also incompatible with newbus, but in that case we probably didn't get this far in the first place.
2004-02-21 21:57:26 +00:00
devsw->d_flags |= D_ALLOCMAJ;
}
static void
fini_cdevsw(struct cdevsw *devsw)
{
if (devsw->d_flags & D_ALLOCMAJ) {
reserved_majors[devsw->d_maj] = 0;
devsw->d_maj = MAJOR_AUTO;
devsw->d_flags &= ~D_ALLOCMAJ;
Fix two oversights here: don't trash the freelist, and properly cleanup the cdevsw{}. Submitted by: tegge
2004-02-23 08:42:55 +00:00
} else if (devsw->d_maj == 0)
devsw->d_maj = 256;
devsw->d_flags &= ~D_INIT;
Device megapatch 2/6: This commit adds a couple of functions for pseudodrivers to use for implementing cloning in a manner we will be able to lock down (shortly). Basically what happens is that pseudo drivers get a way to ask for "give me the dev_t with this unit number" or alternatively "give me a dev_t with the lowest guaranteed free unit number" (there is unfortunately a lot of non-POLA in the exact numeric value of this number, just live with it for now) Managing the unit number space this way removes the need to use rman(9) to do so in the drivers this greatly simplifies the code in the drivers because even using rman(9) they still needed to manage their dev_t's anyway. I have taken the if_tun, if_tap, snp and nmdm drivers through the mill, partly because they (ab)used makedev(), but mostly because together they represent three different problems for device-cloning: if_tun and snp is the plain case: just give me a device. if_tap has two kinds of devices, with a flag for device type. nmdm has paired devices (ala pty) can you can clone either of them.
2004-02-21 20:29:52 +00:00
}
static void
prep_cdevsw(struct cdevsw *devsw)
{
Device megapatch 6/6: This is what we came here for: Hang dev_t's from their cdevsw, refcount cdevsw and dev_t and generally keep track of things a lot better than we used to: Hold a cdevsw reference around all entrances into the device driver, this will be necessary to safely determine when we can unload driver code. Hold a dev_t reference while the device is open. KASSERT that we do not enter the driver on a non-referenced dev_t. Remove old D_NAG code, anonymous dev_t's are not a problem now. When destroy_dev() is called on a referenced dev_t, move it to dead_cdevsw's list. When the refcount drops, free it. Check that cdevsw->d_version is correct. If not, set all methods to the dead_*() methods to prevent entrance into driver. Print warning on console to this effect. The device driver may still explode if it is also incompatible with newbus, but in that case we probably didn't get this far in the first place.
2004-02-21 21:57:26 +00:00
devlock();
if (devsw->d_version != D_VERSION_00) {
printf(
"WARNING: Device driver \"%s\" has wrong version %s\n",
devsw->d_name, "and is disabled. Recompile KLD module.");
devsw->d_open = dead_open;
devsw->d_close = dead_close;
devsw->d_read = dead_read;
devsw->d_write = dead_write;
devsw->d_ioctl = dead_ioctl;
devsw->d_poll = dead_poll;
devsw->d_mmap = dead_mmap;
devsw->d_strategy = dead_strategy;
devsw->d_dump = dead_dump;
devsw->d_kqfilter = dead_kqfilter;
}
Device megapatch 3/6: Add missing D_TTY flags to various drivers. Complete asserts that dev_t's passed to ttyread(), ttywrite(), ttypoll() and ttykqwrite() have (d_flags & D_TTY) and a struct tty pointer. Make ttyread(), ttywrite(), ttypoll() and ttykqwrite() the default cdevsw methods for D_TTY drivers and remove the explicit initializations in various drivers cdevsw structures.
2004-02-21 20:41:11 +00:00
if (devsw->d_flags & D_TTY) {
if (devsw->d_read == NULL) devsw->d_read = ttyread;
if (devsw->d_write == NULL) devsw->d_write = ttywrite;
if (devsw->d_kqfilter == NULL) devsw->d_kqfilter = ttykqfilter;
if (devsw->d_poll == NULL) devsw->d_poll = ttypoll;
}
Introduce no_poll() default method for device drivers. Have it do exactly the same as vop_nopoll() for consistency and put a comment in the two pointing at each other. Retire seltrue() in favour of no_poll(). Create private default functions in kern_conf.c instead of public ones. Change default strategy to return the bio with ENODEV instead of doing nothing which would lead the bio stranded. Retire public nullopen() and nullclose() as well as the entire band of public no{read,write,ioctl,mmap,kqfilter,strategy,poll,dump} funtions, they are the default actions now. Move the final two trivial functions from subr_xxx.c to kern_conf.c and retire the now empty subr_xxx.c
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;
Device megapatch 6/6: This is what we came here for: Hang dev_t's from their cdevsw, refcount cdevsw and dev_t and generally keep track of things a lot better than we used to: Hold a cdevsw reference around all entrances into the device driver, this will be necessary to safely determine when we can unload driver code. Hold a dev_t reference while the device is open. KASSERT that we do not enter the driver on a non-referenced dev_t. Remove old D_NAG code, anonymous dev_t's are not a problem now. When destroy_dev() is called on a referenced dev_t, move it to dead_cdevsw's list. When the refcount drops, free it. Check that cdevsw->d_version is correct. If not, set all methods to the dead_*() methods to prevent entrance into driver. Print warning on console to this effect. The device driver may still explode if it is also incompatible with newbus, but in that case we probably didn't get this far in the first place.
2004-02-21 21:57:26 +00:00
LIST_INIT(&devsw->d_devs);
devsw->d_flags |= D_INIT;
Add support for allocating a device driver major number on demand. To do this, initialize the d_maj member of the cdevsw to MAJOR_AUTO. When the cdevsw is first passed to make_dev() a free major number will be assigned. Until we have a bit more experience with this a printf will announce this fact. Major numbers are not reclaimed, so loading/unloading the same device driver which uses MAJOR_AUTO will eventually deplete the pool of free major numbers and the system will panic when it can not allocate one. Still undecided who to invonvenience with the solution to this.
2003-02-27 14:46:51 +00:00
if (devsw->d_maj == MAJOR_AUTO) {
Device megapatch 2/6: This commit adds a couple of functions for pseudodrivers to use for implementing cloning in a manner we will be able to lock down (shortly). Basically what happens is that pseudo drivers get a way to ask for "give me the dev_t with this unit number" or alternatively "give me a dev_t with the lowest guaranteed free unit number" (there is unfortunately a lot of non-POLA in the exact numeric value of this number, just live with it for now) Managing the unit number space this way removes the need to use rman(9) to do so in the drivers this greatly simplifies the code in the drivers because even using rman(9) they still needed to manage their dev_t's anyway. I have taken the if_tun, if_tap, snp and nmdm drivers through the mill, partly because they (ab)used makedev(), but mostly because together they represent three different problems for device-cloning: if_tun and snp is the plain case: just give me a device. if_tap has two kinds of devices, with a flag for device type. nmdm has paired devices (ala pty) can you can clone either of them.
2004-02-21 20:29:52 +00:00
find_major(devsw);
Add the flip-side check: If a driver wants a particular major#, make sure it is marked as allocated in reserved_majors[]. Whine if it wasn't.
2003-02-27 15:17:37 +00:00
} else {
Add one little hack to allow us to make MAJOR_AUTO be zero: Let the console driver ask for major 256 and magically change this to mean zero.
2003-03-09 10:28:05 +00:00
if (devsw->d_maj == 256) /* XXX: tty_cons.c is magic */
devsw->d_maj = 0;
Add the flip-side check: If a driver wants a particular major#, make sure it is marked as allocated in reserved_majors[]. Whine if it wasn't.
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;
}
Add support for allocating a device driver major number on demand. To do this, initialize the d_maj member of the cdevsw to MAJOR_AUTO. When the cdevsw is first passed to make_dev() a free major number will be assigned. Until we have a bit more experience with this a printf will announce this fact. Major numbers are not reclaimed, so loading/unloading the same device driver which uses MAJOR_AUTO will eventually deplete the pool of free major numbers and the system will panic when it can not allocate one. Still undecided who to invonvenience with the solution to this.
2003-02-27 14:46:51 +00:00
}
Device megapatch 6/6: This is what we came here for: Hang dev_t's from their cdevsw, refcount cdevsw and dev_t and generally keep track of things a lot better than we used to: Hold a cdevsw reference around all entrances into the device driver, this will be necessary to safely determine when we can unload driver code. Hold a dev_t reference while the device is open. KASSERT that we do not enter the driver on a non-referenced dev_t. Remove old D_NAG code, anonymous dev_t's are not a problem now. When destroy_dev() is called on a referenced dev_t, move it to dead_cdevsw's list. When the refcount drops, free it. Check that cdevsw->d_version is correct. If not, set all methods to the dead_*() methods to prevent entrance into driver. Print warning on console to this effect. The device driver may still explode if it is also incompatible with newbus, but in that case we probably didn't get this far in the first place.
2004-02-21 21:57:26 +00:00
devunlock();
Split the initialization of the cdevsw into a separate function.
2004-02-15 10:35:33 +00:00
}
dev_t
Device megapatch 6/6: This is what we came here for: Hang dev_t's from their cdevsw, refcount cdevsw and dev_t and generally keep track of things a lot better than we used to: Hold a cdevsw reference around all entrances into the device driver, this will be necessary to safely determine when we can unload driver code. Hold a dev_t reference while the device is open. KASSERT that we do not enter the driver on a non-referenced dev_t. Remove old D_NAG code, anonymous dev_t's are not a problem now. When destroy_dev() is called on a referenced dev_t, move it to dead_cdevsw's list. When the refcount drops, free it. Check that cdevsw->d_version is correct. If not, set all methods to the dead_*() methods to prevent entrance into driver. Print warning on console to this effect. The device driver may still explode if it is also incompatible with newbus, but in that case we probably didn't get this far in the first place.
2004-02-21 21:57:26 +00:00
make_dev(struct cdevsw *devsw, int minornr, uid_t uid, gid_t gid, int perms, const char *fmt, ...)
Split the initialization of the cdevsw into a separate function.
2004-02-15 10:35:33 +00:00
{
Fixed style bugs near previous commit (mainly formatting errors and missing parentheses). Use default handling (trap to debugger) for udev2dev(x, 1) since it is an error and doesn't happen anywhere in the sys tree except in bogusly commented out code in coda.
2004-02-15 20:14:47 +00:00
dev_t dev;
Split the initialization of the cdevsw into a separate function.
2004-02-15 10:35:33 +00:00
va_list ap;
int i;
Device megapatch 6/6: This is what we came here for: Hang dev_t's from their cdevsw, refcount cdevsw and dev_t and generally keep track of things a lot better than we used to: Hold a cdevsw reference around all entrances into the device driver, this will be necessary to safely determine when we can unload driver code. Hold a dev_t reference while the device is open. KASSERT that we do not enter the driver on a non-referenced dev_t. Remove old D_NAG code, anonymous dev_t's are not a problem now. When destroy_dev() is called on a referenced dev_t, move it to dead_cdevsw's list. When the refcount drops, free it. Check that cdevsw->d_version is correct. If not, set all methods to the dead_*() methods to prevent entrance into driver. Print warning on console to this effect. The device driver may still explode if it is also incompatible with newbus, but in that case we probably didn't get this far in the first place.
2004-02-21 21:57:26 +00:00
KASSERT((minornr & ~0xffff00ff) == 0,
("Invalid minor (0x%x) in make_dev", minornr));
if (!(devsw->d_flags & D_INIT))
prep_cdevsw(devsw);
dev = makedev(devsw->d_maj, minornr);
Make life a little bit easier for cloning device drivers.
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.
Device megapatch 6/6: This is what we came here for: Hang dev_t's from their cdevsw, refcount cdevsw and dev_t and generally keep track of things a lot better than we used to: Hold a cdevsw reference around all entrances into the device driver, this will be necessary to safely determine when we can unload driver code. Hold a dev_t reference while the device is open. KASSERT that we do not enter the driver on a non-referenced dev_t. Remove old D_NAG code, anonymous dev_t's are not a problem now. When destroy_dev() is called on a referenced dev_t, move it to dead_cdevsw's list. When the refcount drops, free it. Check that cdevsw->d_version is correct. If not, set all methods to the dead_*() methods to prevent entrance into driver. Print warning on console to this effect. The device driver may still explode if it is also incompatible with newbus, but in that case we probably didn't get this far in the first place.
2004-02-21 21:57:26 +00:00
* XXX: still ??
Make life a little bit easier for cloning device drivers.
2003-09-27 21:50:00 +00:00
*/
return (dev);
}
Device megapatch 6/6: This is what we came here for: Hang dev_t's from their cdevsw, refcount cdevsw and dev_t and generally keep track of things a lot better than we used to: Hold a cdevsw reference around all entrances into the device driver, this will be necessary to safely determine when we can unload driver code. Hold a dev_t reference while the device is open. KASSERT that we do not enter the driver on a non-referenced dev_t. Remove old D_NAG code, anonymous dev_t's are not a problem now. When destroy_dev() is called on a referenced dev_t, move it to dead_cdevsw's list. When the refcount drops, free it. Check that cdevsw->d_version is correct. If not, set all methods to the dead_*() methods to prevent entrance into driver. Print warning on console to this effect. The device driver may still explode if it is also incompatible with newbus, but in that case we probably didn't get this far in the first place.
2004-02-21 21:57:26 +00:00
devlock();
KASSERT(!(dev->si_flags & SI_NAMED),
("make_dev() by driver %s on pre-existing device (maj=%d, min=%d, name=%s)",
devsw->d_name, major(dev), minor(dev), devtoname(dev)));
Decommision miscfs/specfs/specdev.h. Most of it goes into <sys/conf.h>, a few lines into <sys/vnode.h>. Add a few fields to struct specinfo, paving the way for the fun part.
1999-08-08 18:43:05 +00:00
va_start(ap, fmt);
Implement proper bounds-checking and truncation of device names, this has become an issue now that end-user controlable attributes can become devices names with the geom_vol_ffs class.
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);
}
Decommision miscfs/specfs/specdev.h. Most of it goes into <sys/conf.h>, a few lines into <sys/vnode.h>. Add a few fields to struct specinfo, paving the way for the fun part.
1999-08-08 18:43:05 +00:00
va_end(ap);
dev->si_devsw = devsw;
Remove all traces of Julians DEVFS (incl from kern/subr_diskslice.c) Remove old DEVFS support fields from dev_t. Make uid, gid & mode members of dev_t and set them in make_dev(). Use correct uid, gid & mode in make_dev in disk minilayer. Add support for registering alias names for a dev_t using the new function make_dev_alias(). These will show up as symlinks in DEVFS. Use makedev() rather than make_dev() for MFSs magic devices to prevent DEVFS from noticing this abuse. Add a field for DEVFS inode number in dev_t. Add new DEVFS in fs/devfs. Add devfs cloning to: disk minilayer (ie: ad(4), sd(4), cd(4) etc etc) md(4), tun(4), bpf(4), fd(4) If DEVFS add -d flag to /sbin/inits args to make it mount devfs. Add commented out DEVFS to GENERIC
2000-08-20 21:34:39 +00:00
dev->si_uid = uid;
dev->si_gid = gid;
dev->si_mode = perms;
revent multiple make_dev() calls on the same dev_t and similar bogosities. A couple of new warnings may be emitted during boot if drivers DTWT. Tested by: George Cox <gjvc@gjvc.com>
2000-09-11 17:15:33 +00:00
dev->si_flags |= SI_NAMED;
Remove all traces of Julians DEVFS (incl from kern/subr_diskslice.c) Remove old DEVFS support fields from dev_t. Make uid, gid & mode members of dev_t and set them in make_dev(). Use correct uid, gid & mode in make_dev in disk minilayer. Add support for registering alias names for a dev_t using the new function make_dev_alias(). These will show up as symlinks in DEVFS. Use makedev() rather than make_dev() for MFSs magic devices to prevent DEVFS from noticing this abuse. Add a field for DEVFS inode number in dev_t. Add new DEVFS in fs/devfs. Add devfs cloning to: disk minilayer (ie: ad(4), sd(4), cd(4) etc etc) md(4), tun(4), bpf(4), fd(4) If DEVFS add -d flag to /sbin/inits args to make it mount devfs. Add commented out DEVFS to GENERIC
2000-08-20 21:34:39 +00:00
Device megapatch 6/6: This is what we came here for: Hang dev_t's from their cdevsw, refcount cdevsw and dev_t and generally keep track of things a lot better than we used to: Hold a cdevsw reference around all entrances into the device driver, this will be necessary to safely determine when we can unload driver code. Hold a dev_t reference while the device is open. KASSERT that we do not enter the driver on a non-referenced dev_t. Remove old D_NAG code, anonymous dev_t's are not a problem now. When destroy_dev() is called on a referenced dev_t, move it to dead_cdevsw's list. When the refcount drops, free it. Check that cdevsw->d_version is correct. If not, set all methods to the dead_*() methods to prevent entrance into driver. Print warning on console to this effect. The device driver may still explode if it is also incompatible with newbus, but in that case we probably didn't get this far in the first place.
2004-02-21 21:57:26 +00:00
LIST_INSERT_HEAD(&devsw->d_devs, dev, si_list);
NODEVFS cleanup: Replace devfs_{create,destroy} hooks with direct function calls.
2003-03-02 13:35:30 +00:00
devfs_create(dev);
Device megapatch 6/6: This is what we came here for: Hang dev_t's from their cdevsw, refcount cdevsw and dev_t and generally keep track of things a lot better than we used to: Hold a cdevsw reference around all entrances into the device driver, this will be necessary to safely determine when we can unload driver code. Hold a dev_t reference while the device is open. KASSERT that we do not enter the driver on a non-referenced dev_t. Remove old D_NAG code, anonymous dev_t's are not a problem now. When destroy_dev() is called on a referenced dev_t, move it to dead_cdevsw's list. When the refcount drops, free it. Check that cdevsw->d_version is correct. If not, set all methods to the dead_*() methods to prevent entrance into driver. Print warning on console to this effect. The device driver may still explode if it is also incompatible with newbus, but in that case we probably didn't get this far in the first place.
2004-02-21 21:57:26 +00:00
devunlock();
Remove all traces of Julians DEVFS (incl from kern/subr_diskslice.c) Remove old DEVFS support fields from dev_t. Make uid, gid & mode members of dev_t and set them in make_dev(). Use correct uid, gid & mode in make_dev in disk minilayer. Add support for registering alias names for a dev_t using the new function make_dev_alias(). These will show up as symlinks in DEVFS. Use makedev() rather than make_dev() for MFSs magic devices to prevent DEVFS from noticing this abuse. Add a field for DEVFS inode number in dev_t. Add new DEVFS in fs/devfs. Add devfs cloning to: disk minilayer (ie: ad(4), sd(4), cd(4) etc etc) md(4), tun(4), bpf(4), fd(4) If DEVFS add -d flag to /sbin/inits args to make it mount devfs. Add commented out DEVFS to GENERIC
2000-08-20 21:34:39 +00:00
return (dev);
}
Add dev_named(dev, name), which is similar in spirit to devtoname(). This function returns success if the device is known by either 'name' or any of its aliases.
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);
}
Create a general facility for making dev_t's depend on another dev_t. The dev_depends(dev_t, dev_t) function is for tying them to each other. When destroy_dev() is called on a dev_t, all dev_t's depending on it will also be destroyed (depth first order). Rewrite the make_dev_alias() to use this dependency facility. kern/subr_disk.c: Make the disk mini-layer use dependencies to make sure all relevant dev_t's are removed when the disk disappears. Make the disk mini-layer precreate some magic sub devices which the disk/slice/label code expects to be there. kern/subr_disklabel.c: Remove some now unneeded variables. kern/subr_diskmbr.c: Remove some ancient, commented out code. kern/subr_diskslice.c: Minor cleanup. Use name from dev_t instead of dsname()
2001-05-26 08:27:58 +00:00
void
dev_depends(dev_t pdev, dev_t cdev)
{
Device megapatch 6/6: This is what we came here for: Hang dev_t's from their cdevsw, refcount cdevsw and dev_t and generally keep track of things a lot better than we used to: Hold a cdevsw reference around all entrances into the device driver, this will be necessary to safely determine when we can unload driver code. Hold a dev_t reference while the device is open. KASSERT that we do not enter the driver on a non-referenced dev_t. Remove old D_NAG code, anonymous dev_t's are not a problem now. When destroy_dev() is called on a referenced dev_t, move it to dead_cdevsw's list. When the refcount drops, free it. Check that cdevsw->d_version is correct. If not, set all methods to the dead_*() methods to prevent entrance into driver. Print warning on console to this effect. The device driver may still explode if it is also incompatible with newbus, but in that case we probably didn't get this far in the first place.
2004-02-21 21:57:26 +00:00
devlock();
Create a general facility for making dev_t's depend on another dev_t. The dev_depends(dev_t, dev_t) function is for tying them to each other. When destroy_dev() is called on a dev_t, all dev_t's depending on it will also be destroyed (depth first order). Rewrite the make_dev_alias() to use this dependency facility. kern/subr_disk.c: Make the disk mini-layer use dependencies to make sure all relevant dev_t's are removed when the disk disappears. Make the disk mini-layer precreate some magic sub devices which the disk/slice/label code expects to be there. kern/subr_disklabel.c: Remove some now unneeded variables. kern/subr_diskmbr.c: Remove some ancient, commented out code. kern/subr_diskslice.c: Minor cleanup. Use name from dev_t instead of dsname()
2001-05-26 08:27:58 +00:00
cdev->si_parent = pdev;
cdev->si_flags |= SI_CHILD;
LIST_INSERT_HEAD(&pdev->si_children, cdev, si_siblings);
Device megapatch 6/6: This is what we came here for: Hang dev_t's from their cdevsw, refcount cdevsw and dev_t and generally keep track of things a lot better than we used to: Hold a cdevsw reference around all entrances into the device driver, this will be necessary to safely determine when we can unload driver code. Hold a dev_t reference while the device is open. KASSERT that we do not enter the driver on a non-referenced dev_t. Remove old D_NAG code, anonymous dev_t's are not a problem now. When destroy_dev() is called on a referenced dev_t, move it to dead_cdevsw's list. When the refcount drops, free it. Check that cdevsw->d_version is correct. If not, set all methods to the dead_*() methods to prevent entrance into driver. Print warning on console to this effect. The device driver may still explode if it is also incompatible with newbus, but in that case we probably didn't get this far in the first place.
2004-02-21 21:57:26 +00:00
devunlock();
Create a general facility for making dev_t's depend on another dev_t. The dev_depends(dev_t, dev_t) function is for tying them to each other. When destroy_dev() is called on a dev_t, all dev_t's depending on it will also be destroyed (depth first order). Rewrite the make_dev_alias() to use this dependency facility. kern/subr_disk.c: Make the disk mini-layer use dependencies to make sure all relevant dev_t's are removed when the disk disappears. Make the disk mini-layer precreate some magic sub devices which the disk/slice/label code expects to be there. kern/subr_disklabel.c: Remove some now unneeded variables. kern/subr_diskmbr.c: Remove some ancient, commented out code. kern/subr_diskslice.c: Minor cleanup. Use name from dev_t instead of dsname()
2001-05-26 08:27:58 +00:00
}
Remove all traces of Julians DEVFS (incl from kern/subr_diskslice.c) Remove old DEVFS support fields from dev_t. Make uid, gid & mode members of dev_t and set them in make_dev(). Use correct uid, gid & mode in make_dev in disk minilayer. Add support for registering alias names for a dev_t using the new function make_dev_alias(). These will show up as symlinks in DEVFS. Use makedev() rather than make_dev() for MFSs magic devices to prevent DEVFS from noticing this abuse. Add a field for DEVFS inode number in dev_t. Add new DEVFS in fs/devfs. Add devfs cloning to: disk minilayer (ie: ad(4), sd(4), cd(4) etc etc) md(4), tun(4), bpf(4), fd(4) If DEVFS add -d flag to /sbin/inits args to make it mount devfs. Add commented out DEVFS to GENERIC
2000-08-20 21:34:39 +00:00
dev_t
Make the fmt arguments to make_dev and make_dev_alias const char *. Approved on IRC as long as it didn't cause a large number of warnings by: phk MFC After: 700 hours
2001-08-02 20:35:35 +00:00
make_dev_alias(dev_t pdev, const char *fmt, ...)
Remove all traces of Julians DEVFS (incl from kern/subr_diskslice.c) Remove old DEVFS support fields from dev_t. Make uid, gid & mode members of dev_t and set them in make_dev(). Use correct uid, gid & mode in make_dev in disk minilayer. Add support for registering alias names for a dev_t using the new function make_dev_alias(). These will show up as symlinks in DEVFS. Use makedev() rather than make_dev() for MFSs magic devices to prevent DEVFS from noticing this abuse. Add a field for DEVFS inode number in dev_t. Add new DEVFS in fs/devfs. Add devfs cloning to: disk minilayer (ie: ad(4), sd(4), cd(4) etc etc) md(4), tun(4), bpf(4), fd(4) If DEVFS add -d flag to /sbin/inits args to make it mount devfs. Add commented out DEVFS to GENERIC
2000-08-20 21:34:39 +00:00
{
dev_t dev;
va_list ap;
int i;
dev = allocdev();
Device megapatch 6/6: This is what we came here for: Hang dev_t's from their cdevsw, refcount cdevsw and dev_t and generally keep track of things a lot better than we used to: Hold a cdevsw reference around all entrances into the device driver, this will be necessary to safely determine when we can unload driver code. Hold a dev_t reference while the device is open. KASSERT that we do not enter the driver on a non-referenced dev_t. Remove old D_NAG code, anonymous dev_t's are not a problem now. When destroy_dev() is called on a referenced dev_t, move it to dead_cdevsw's list. When the refcount drops, free it. Check that cdevsw->d_version is correct. If not, set all methods to the dead_*() methods to prevent entrance into driver. Print warning on console to this effect. The device driver may still explode if it is also incompatible with newbus, but in that case we probably didn't get this far in the first place.
2004-02-21 21:57:26 +00:00
devlock();
Remove all traces of Julians DEVFS (incl from kern/subr_diskslice.c) Remove old DEVFS support fields from dev_t. Make uid, gid & mode members of dev_t and set them in make_dev(). Use correct uid, gid & mode in make_dev in disk minilayer. Add support for registering alias names for a dev_t using the new function make_dev_alias(). These will show up as symlinks in DEVFS. Use makedev() rather than make_dev() for MFSs magic devices to prevent DEVFS from noticing this abuse. Add a field for DEVFS inode number in dev_t. Add new DEVFS in fs/devfs. Add devfs cloning to: disk minilayer (ie: ad(4), sd(4), cd(4) etc etc) md(4), tun(4), bpf(4), fd(4) If DEVFS add -d flag to /sbin/inits args to make it mount devfs. Add commented out DEVFS to GENERIC
2000-08-20 21:34:39 +00:00
dev->si_flags |= SI_ALIAS;
revent multiple make_dev() calls on the same dev_t and similar bogosities. A couple of new warnings may be emitted during boot if drivers DTWT. Tested by: George Cox <gjvc@gjvc.com>
2000-09-11 17:15:33 +00:00
dev->si_flags |= SI_NAMED;
Remove all traces of Julians DEVFS (incl from kern/subr_diskslice.c) Remove old DEVFS support fields from dev_t. Make uid, gid & mode members of dev_t and set them in make_dev(). Use correct uid, gid & mode in make_dev in disk minilayer. Add support for registering alias names for a dev_t using the new function make_dev_alias(). These will show up as symlinks in DEVFS. Use makedev() rather than make_dev() for MFSs magic devices to prevent DEVFS from noticing this abuse. Add a field for DEVFS inode number in dev_t. Add new DEVFS in fs/devfs. Add devfs cloning to: disk minilayer (ie: ad(4), sd(4), cd(4) etc etc) md(4), tun(4), bpf(4), fd(4) If DEVFS add -d flag to /sbin/inits args to make it mount devfs. Add commented out DEVFS to GENERIC
2000-08-20 21:34:39 +00:00
va_start(ap, fmt);
Implement proper bounds-checking and truncation of device names, this has become an issue now that end-user controlable attributes can become devices names with the geom_vol_ffs class.
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);
}
Remove all traces of Julians DEVFS (incl from kern/subr_diskslice.c) Remove old DEVFS support fields from dev_t. Make uid, gid & mode members of dev_t and set them in make_dev(). Use correct uid, gid & mode in make_dev in disk minilayer. Add support for registering alias names for a dev_t using the new function make_dev_alias(). These will show up as symlinks in DEVFS. Use makedev() rather than make_dev() for MFSs magic devices to prevent DEVFS from noticing this abuse. Add a field for DEVFS inode number in dev_t. Add new DEVFS in fs/devfs. Add devfs cloning to: disk minilayer (ie: ad(4), sd(4), cd(4) etc etc) md(4), tun(4), bpf(4), fd(4) If DEVFS add -d flag to /sbin/inits args to make it mount devfs. Add commented out DEVFS to GENERIC
2000-08-20 21:34:39 +00:00
va_end(ap);
First small steps at merging DEVFS and PHK's Dev_t stuff.
1999-08-20 20:25:00 +00:00
NODEVFS cleanup: Replace devfs_{create,destroy} hooks with direct function calls.
2003-03-02 13:35:30 +00:00
devfs_create(dev);
Device megapatch 6/6: This is what we came here for: Hang dev_t's from their cdevsw, refcount cdevsw and dev_t and generally keep track of things a lot better than we used to: Hold a cdevsw reference around all entrances into the device driver, this will be necessary to safely determine when we can unload driver code. Hold a dev_t reference while the device is open. KASSERT that we do not enter the driver on a non-referenced dev_t. Remove old D_NAG code, anonymous dev_t's are not a problem now. When destroy_dev() is called on a referenced dev_t, move it to dead_cdevsw's list. When the refcount drops, free it. Check that cdevsw->d_version is correct. If not, set all methods to the dead_*() methods to prevent entrance into driver. Print warning on console to this effect. The device driver may still explode if it is also incompatible with newbus, but in that case we probably didn't get this far in the first place.
2004-02-21 21:57:26 +00:00
devunlock();
dev_depends(pdev, dev);
Decommision miscfs/specfs/specdev.h. Most of it goes into <sys/conf.h>, a few lines into <sys/vnode.h>. Add a few fields to struct specinfo, paving the way for the fun part.
1999-08-08 18:43:05 +00:00
return (dev);
}
Device megapatch 6/6: This is what we came here for: Hang dev_t's from their cdevsw, refcount cdevsw and dev_t and generally keep track of things a lot better than we used to: Hold a cdevsw reference around all entrances into the device driver, this will be necessary to safely determine when we can unload driver code. Hold a dev_t reference while the device is open. KASSERT that we do not enter the driver on a non-referenced dev_t. Remove old D_NAG code, anonymous dev_t's are not a problem now. When destroy_dev() is called on a referenced dev_t, move it to dead_cdevsw's list. When the refcount drops, free it. Check that cdevsw->d_version is correct. If not, set all methods to the dead_*() methods to prevent entrance into driver. Print warning on console to this effect. The device driver may still explode if it is also incompatible with newbus, but in that case we probably didn't get this far in the first place.
2004-02-21 21:57:26 +00:00
static void
idestroy_dev(dev_t dev)
Add dev_t freeing code. Controlled by sysctl debug.free_devt, default is off.
1999-08-29 09:09:12 +00:00
{
revent multiple make_dev() calls on the same dev_t and similar bogosities. A couple of new warnings may be emitted during boot if drivers DTWT. Tested by: George Cox <gjvc@gjvc.com>
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));
Nudge the axe a bit closer to cdevsw[]: Make it a panic to repeat make_dev() or destroy_dev(), this check should maybe be neutered when -current goes -stable. Whine if devsw() is called on anon dev_t's in a devfs system. Make a hack to avoid our lazy-eval disk code triggering the above whine. Fix the multiple make_dev() in disk code by making ${disk}${unit}s${slice} an alias/symlink to ${disk}${unit}s${slice}c
2001-10-27 17:44:21 +00:00
panic("don't do that");
revent multiple make_dev() calls on the same dev_t and similar bogosities. A couple of new warnings may be emitted during boot if drivers DTWT. Tested by: George Cox <gjvc@gjvc.com>
2000-09-11 17:15:33 +00:00
}
NODEVFS cleanup: Replace devfs_{create,destroy} hooks with direct function calls.
2003-03-02 13:35:30 +00:00
devfs_destroy(dev);
Device megapatch 6/6: This is what we came here for: Hang dev_t's from their cdevsw, refcount cdevsw and dev_t and generally keep track of things a lot better than we used to: Hold a cdevsw reference around all entrances into the device driver, this will be necessary to safely determine when we can unload driver code. Hold a dev_t reference while the device is open. KASSERT that we do not enter the driver on a non-referenced dev_t. Remove old D_NAG code, anonymous dev_t's are not a problem now. When destroy_dev() is called on a referenced dev_t, move it to dead_cdevsw's list. When the refcount drops, free it. Check that cdevsw->d_version is correct. If not, set all methods to the dead_*() methods to prevent entrance into driver. Print warning on console to this effect. The device driver may still explode if it is also incompatible with newbus, but in that case we probably didn't get this far in the first place.
2004-02-21 21:57:26 +00:00
/* Remove name marking */
Device megapatch 2/6: This commit adds a couple of functions for pseudodrivers to use for implementing cloning in a manner we will be able to lock down (shortly). Basically what happens is that pseudo drivers get a way to ask for "give me the dev_t with this unit number" or alternatively "give me a dev_t with the lowest guaranteed free unit number" (there is unfortunately a lot of non-POLA in the exact numeric value of this number, just live with it for now) Managing the unit number space this way removes the need to use rman(9) to do so in the drivers this greatly simplifies the code in the drivers because even using rman(9) they still needed to manage their dev_t's anyway. I have taken the if_tun, if_tap, snp and nmdm drivers through the mill, partly because they (ab)used makedev(), but mostly because together they represent three different problems for device-cloning: if_tun and snp is the plain case: just give me a device. if_tap has two kinds of devices, with a flag for device type. nmdm has paired devices (ala pty) can you can clone either of them.
2004-02-21 20:29:52 +00:00
dev->si_flags &= ~SI_NAMED;
Device megapatch 6/6: This is what we came here for: Hang dev_t's from their cdevsw, refcount cdevsw and dev_t and generally keep track of things a lot better than we used to: Hold a cdevsw reference around all entrances into the device driver, this will be necessary to safely determine when we can unload driver code. Hold a dev_t reference while the device is open. KASSERT that we do not enter the driver on a non-referenced dev_t. Remove old D_NAG code, anonymous dev_t's are not a problem now. When destroy_dev() is called on a referenced dev_t, move it to dead_cdevsw's list. When the refcount drops, free it. Check that cdevsw->d_version is correct. If not, set all methods to the dead_*() methods to prevent entrance into driver. Print warning on console to this effect. The device driver may still explode if it is also incompatible with newbus, but in that case we probably didn't get this far in the first place.
2004-02-21 21:57:26 +00:00
/* If we are a child, remove us from the parents list */
Create a general facility for making dev_t's depend on another dev_t. The dev_depends(dev_t, dev_t) function is for tying them to each other. When destroy_dev() is called on a dev_t, all dev_t's depending on it will also be destroyed (depth first order). Rewrite the make_dev_alias() to use this dependency facility. kern/subr_disk.c: Make the disk mini-layer use dependencies to make sure all relevant dev_t's are removed when the disk disappears. Make the disk mini-layer precreate some magic sub devices which the disk/slice/label code expects to be there. kern/subr_disklabel.c: Remove some now unneeded variables. kern/subr_diskmbr.c: Remove some ancient, commented out code. kern/subr_diskslice.c: Minor cleanup. Use name from dev_t instead of dsname()
2001-05-26 08:27:58 +00:00
if (dev->si_flags & SI_CHILD) {
LIST_REMOVE(dev, si_siblings);
dev->si_flags &= ~SI_CHILD;
}
Device megapatch 6/6: This is what we came here for: Hang dev_t's from their cdevsw, refcount cdevsw and dev_t and generally keep track of things a lot better than we used to: Hold a cdevsw reference around all entrances into the device driver, this will be necessary to safely determine when we can unload driver code. Hold a dev_t reference while the device is open. KASSERT that we do not enter the driver on a non-referenced dev_t. Remove old D_NAG code, anonymous dev_t's are not a problem now. When destroy_dev() is called on a referenced dev_t, move it to dead_cdevsw's list. When the refcount drops, free it. Check that cdevsw->d_version is correct. If not, set all methods to the dead_*() methods to prevent entrance into driver. Print warning on console to this effect. The device driver may still explode if it is also incompatible with newbus, but in that case we probably didn't get this far in the first place.
2004-02-21 21:57:26 +00:00
/* Kill our children */
Create a general facility for making dev_t's depend on another dev_t. The dev_depends(dev_t, dev_t) function is for tying them to each other. When destroy_dev() is called on a dev_t, all dev_t's depending on it will also be destroyed (depth first order). Rewrite the make_dev_alias() to use this dependency facility. kern/subr_disk.c: Make the disk mini-layer use dependencies to make sure all relevant dev_t's are removed when the disk disappears. Make the disk mini-layer precreate some magic sub devices which the disk/slice/label code expects to be there. kern/subr_disklabel.c: Remove some now unneeded variables. kern/subr_diskmbr.c: Remove some ancient, commented out code. kern/subr_diskslice.c: Minor cleanup. Use name from dev_t instead of dsname()
2001-05-26 08:27:58 +00:00
while (!LIST_EMPTY(&dev->si_children))
Device megapatch 6/6: This is what we came here for: Hang dev_t's from their cdevsw, refcount cdevsw and dev_t and generally keep track of things a lot better than we used to: Hold a cdevsw reference around all entrances into the device driver, this will be necessary to safely determine when we can unload driver code. Hold a dev_t reference while the device is open. KASSERT that we do not enter the driver on a non-referenced dev_t. Remove old D_NAG code, anonymous dev_t's are not a problem now. When destroy_dev() is called on a referenced dev_t, move it to dead_cdevsw's list. When the refcount drops, free it. Check that cdevsw->d_version is correct. If not, set all methods to the dead_*() methods to prevent entrance into driver. Print warning on console to this effect. The device driver may still explode if it is also incompatible with newbus, but in that case we probably didn't get this far in the first place.
2004-02-21 21:57:26 +00:00
idestroy_dev(LIST_FIRST(&dev->si_children));
/* Remove from clone list */
Device megapatch 2/6: This commit adds a couple of functions for pseudodrivers to use for implementing cloning in a manner we will be able to lock down (shortly). Basically what happens is that pseudo drivers get a way to ask for "give me the dev_t with this unit number" or alternatively "give me a dev_t with the lowest guaranteed free unit number" (there is unfortunately a lot of non-POLA in the exact numeric value of this number, just live with it for now) Managing the unit number space this way removes the need to use rman(9) to do so in the drivers this greatly simplifies the code in the drivers because even using rman(9) they still needed to manage their dev_t's anyway. I have taken the if_tun, if_tap, snp and nmdm drivers through the mill, partly because they (ab)used makedev(), but mostly because together they represent three different problems for device-cloning: if_tun and snp is the plain case: just give me a device. if_tap has two kinds of devices, with a flag for device type. nmdm has paired devices (ala pty) can you can clone either of them.
2004-02-21 20:29:52 +00:00
if (dev->si_flags & SI_CLONELIST) {
LIST_REMOVE(dev, si_clone);
dev->si_flags &= ~SI_CLONELIST;
}
Device megapatch 6/6: This is what we came here for: Hang dev_t's from their cdevsw, refcount cdevsw and dev_t and generally keep track of things a lot better than we used to: Hold a cdevsw reference around all entrances into the device driver, this will be necessary to safely determine when we can unload driver code. Hold a dev_t reference while the device is open. KASSERT that we do not enter the driver on a non-referenced dev_t. Remove old D_NAG code, anonymous dev_t's are not a problem now. When destroy_dev() is called on a referenced dev_t, move it to dead_cdevsw's list. When the refcount drops, free it. Check that cdevsw->d_version is correct. If not, set all methods to the dead_*() methods to prevent entrance into driver. Print warning on console to this effect. The device driver may still explode if it is also incompatible with newbus, but in that case we probably didn't get this far in the first place.
2004-02-21 21:57:26 +00:00
if (!(dev->si_flags & SI_ALIAS)) {
/* Remove from cdevsw list */
LIST_REMOVE(dev, si_list);
/* If cdevsw has no dev_t's, clean it */
if (LIST_EMPTY(&dev->si_devsw->d_devs))
fini_cdevsw(dev->si_devsw);
LIST_REMOVE(dev, si_hash);
}
Add dev_t freeing code. Controlled by sysctl debug.free_devt, default is off.
1999-08-29 09:09:12 +00:00
dev->si_drv1 = 0;
dev->si_drv2 = 0;
Device megapatch 6/6: This is what we came here for: Hang dev_t's from their cdevsw, refcount cdevsw and dev_t and generally keep track of things a lot better than we used to: Hold a cdevsw reference around all entrances into the device driver, this will be necessary to safely determine when we can unload driver code. Hold a dev_t reference while the device is open. KASSERT that we do not enter the driver on a non-referenced dev_t. Remove old D_NAG code, anonymous dev_t's are not a problem now. When destroy_dev() is called on a referenced dev_t, move it to dead_cdevsw's list. When the refcount drops, free it. Check that cdevsw->d_version is correct. If not, set all methods to the dead_*() methods to prevent entrance into driver. Print warning on console to this effect. The device driver may still explode if it is also incompatible with newbus, but in that case we probably didn't get this far in the first place.
2004-02-21 21:57:26 +00:00
dev->si_devsw = NULL;
Break the following implementation of panic(3): #!bin/sh # Original version of this by Michael Reifenberger # <root@nihil.plaut.de>. mdconfig -d -u 11 >/dev/null 2>&1 dd if=/dev/zero of=zz bs=1m count=1 while : do mdconfig -a -t vnode -f zz -u 11 fdisk -f - -iv /dev/md11 <<EOF1 g c1 h64 s32 p 1 165 0 2048 a 1 EOF1 mdconfig -d -u 11 done Garbage pointers in __si_u were not cleared by destroy_dev(). Not clearing si_disk made the above fatal because the disk layer uses si_disk as a flag to indicate that the dev_t has been completely initialized. disk_destroy() clears si_disk for the parent dev_t but doesn't get called for children. Not fixed: - setting the undocumented sysctl debug.free_devt should cause more complete destruction of the dev_t including clearing of __si_u, but actually causes the above to panic a little earlier. - the loop leaks 10 memory allocations per iteration (4 DEVFS, 2 devbuf and 4 dev_t). Reviewed by: timeout by MAINTAINER after 3 months
2002-04-25 13:17:33 +00:00
bzero(&dev->__si_u, sizeof(dev->__si_u));
revent multiple make_dev() calls on the same dev_t and similar bogosities. A couple of new warnings may be emitted during boot if drivers DTWT. Tested by: George Cox <gjvc@gjvc.com>
2000-09-11 17:15:33 +00:00
dev->si_flags &= ~SI_ALIAS;
Device megapatch 6/6: This is what we came here for: Hang dev_t's from their cdevsw, refcount cdevsw and dev_t and generally keep track of things a lot better than we used to: Hold a cdevsw reference around all entrances into the device driver, this will be necessary to safely determine when we can unload driver code. Hold a dev_t reference while the device is open. KASSERT that we do not enter the driver on a non-referenced dev_t. Remove old D_NAG code, anonymous dev_t's are not a problem now. When destroy_dev() is called on a referenced dev_t, move it to dead_cdevsw's list. When the refcount drops, free it. Check that cdevsw->d_version is correct. If not, set all methods to the dead_*() methods to prevent entrance into driver. Print warning on console to this effect. The device driver may still explode if it is also incompatible with newbus, but in that case we probably didn't get this far in the first place.
2004-02-21 21:57:26 +00:00
if (dev->si_refcount > 0) {
LIST_INSERT_HEAD(&dead_cdevsw.d_devs, dev, si_list);
} else {
freedev(dev);
}
}
void
destroy_dev(dev_t dev)
{
devlock();
idestroy_dev(dev);
devunlock();
Add dev_t freeing code. Controlled by sysctl debug.free_devt, default is off.
1999-08-29 09:09:12 +00:00
}
Const'ify devtoname() and d_name. This exposes some errors (2 non-benign). Handle negative minor numbers properly in devtoname().
1999-09-13 12:29:32 +00:00
const char *
Welcome devtoname(), to most likely be used when printing information about a dev_t. printf("%x", dev) now becomes printf("%s", devtoname(dev)) because printing actual information about the device is much more useful then printing a pointer to an address that would never help the developer debug. Submitted by: phk, bde
1999-08-17 20:25:50 +00:00
devtoname(dev_t dev)
{
Add dev_t freeing code. Controlled by sysctl debug.free_devt, default is off.
1999-08-29 09:09:12 +00:00
char *p;
Const'ify devtoname() and d_name. This exposes some errors (2 non-benign). Handle negative minor numbers properly in devtoname().
1999-09-13 12:29:32 +00:00
int mynor;
Add dev_t freeing code. Controlled by sysctl debug.free_devt, default is off.
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);
Const'ify devtoname() and d_name. This exposes some errors (2 non-benign). Handle negative minor numbers properly in devtoname().
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);
Add dev_t freeing code. Controlled by sysctl debug.free_devt, default is off.
1999-08-29 09:09:12 +00:00
}
Welcome devtoname(), to most likely be used when printing information about a dev_t. printf("%x", dev) now becomes printf("%s", devtoname(dev)) because printing actual information about the device is much more useful then printing a pointer to an address that would never help the developer debug. Submitted by: phk, bde
1999-08-17 20:25:50 +00:00
return (dev->si_name);
}
Avoid the modules madness I inadvertently introduced by making the cloning infrastructure standard in kern_conf. Modules are now the same with or without devfs support. If you need to detect if devfs is present, in modules or elsewhere, check the integer variable "devfs_present". This happily removes an ugly hack from kern/vfs_conf.c. This forces a rename of the eventhandler and the standard clone helper function. Include <sys/eventhandler.h> in <sys/conf.h>: it's a helper #include like <sys/queue.h> Remove all #includes of opt_devfs.h they no longer matter.
2000-09-02 19:17:34 +00:00
int
Make the proposed name arg to dev_stdclone() const.
2002-03-10 10:50:05 +00:00
dev_stdclone(char *name, char **namep, const char *stem, int *unit)
Avoid the modules madness I inadvertently introduced by making the cloning infrastructure standard in kern_conf. Modules are now the same with or without devfs support. If you need to detect if devfs is present, in modules or elsewhere, check the integer variable "devfs_present". This happily removes an ugly hack from kern/vfs_conf.c. This forces a rename of the eventhandler and the standard clone helper function. Include <sys/eventhandler.h> in <sys/conf.h>: it's a helper #include like <sys/queue.h> Remove all #includes of opt_devfs.h they no longer matter.
2000-09-02 19:17:34 +00:00
{
int u, i;
i = strlen(stem);
Call strlen() once instead of twice.
2001-04-14 21:33:58 +00:00
if (bcmp(stem, name, i) != 0)
return (0);
Avoid the modules madness I inadvertently introduced by making the cloning infrastructure standard in kern_conf. Modules are now the same with or without devfs support. If you need to detect if devfs is present, in modules or elsewhere, check the integer variable "devfs_present". This happily removes an ugly hack from kern/vfs_conf.c. This forces a rename of the eventhandler and the standard clone helper function. Include <sys/eventhandler.h> in <sys/conf.h>: it's a helper #include like <sys/queue.h> Remove all #includes of opt_devfs.h they no longer matter.
2000-09-02 19:17:34 +00:00
if (!isdigit(name[i]))
return (0);
u = 0;
Reject leading zeros in dev_stdclone(). PR: 32019 Submitted by: fenner
2001-11-16 17:05:07 +00:00
if (name[i] == '0' && isdigit(name[i+1]))
return (0);
Avoid the modules madness I inadvertently introduced by making the cloning infrastructure standard in kern_conf. Modules are now the same with or without devfs support. If you need to detect if devfs is present, in modules or elsewhere, check the integer variable "devfs_present". This happily removes an ugly hack from kern/vfs_conf.c. This forces a rename of the eventhandler and the standard clone helper function. Include <sys/eventhandler.h> in <sys/conf.h>: it's a helper #include like <sys/queue.h> Remove all #includes of opt_devfs.h they no longer matter.
2000-09-02 19:17:34 +00:00
while (isdigit(name[i])) {
u *= 10;
u += name[i++] - '0';
}
Don't allow dev_stdclone(9) to accept minors larger than the system is able to handle (0xffffff).
2002-10-05 17:10:28 +00:00
if (u > 0xffffff)
return (0);
Avoid the modules madness I inadvertently introduced by making the cloning infrastructure standard in kern_conf. Modules are now the same with or without devfs support. If you need to detect if devfs is present, in modules or elsewhere, check the integer variable "devfs_present". This happily removes an ugly hack from kern/vfs_conf.c. This forces a rename of the eventhandler and the standard clone helper function. Include <sys/eventhandler.h> in <sys/conf.h>: it's a helper #include like <sys/queue.h> Remove all #includes of opt_devfs.h they no longer matter.
2000-09-02 19:17:34 +00:00
*unit = u;
if (namep)
*namep = &name[i];
if (name[i])
return (2);
return (1);
}
Add code to devname(3) so it can find the names of devices which were not present when dev_mkdb(8) was run. First the dev_mkdb(8) database is searched, this caters for non-DEVFS cases where people have renamed a device. If that fails we ask the kernel using sysctl kern.devname if the device driver has put a name in the dev_t. This covers DEVFS cloned devices. If that also fails we format a string which isn't entirely useless.
2000-09-09 11:39:59 +00:00
Device megapatch 2/6: This commit adds a couple of functions for pseudodrivers to use for implementing cloning in a manner we will be able to lock down (shortly). Basically what happens is that pseudo drivers get a way to ask for "give me the dev_t with this unit number" or alternatively "give me a dev_t with the lowest guaranteed free unit number" (there is unfortunately a lot of non-POLA in the exact numeric value of this number, just live with it for now) Managing the unit number space this way removes the need to use rman(9) to do so in the drivers this greatly simplifies the code in the drivers because even using rman(9) they still needed to manage their dev_t's anyway. I have taken the if_tun, if_tap, snp and nmdm drivers through the mill, partly because they (ab)used makedev(), but mostly because together they represent three different problems for device-cloning: if_tun and snp is the plain case: just give me a device. if_tap has two kinds of devices, with a flag for device type. nmdm has paired devices (ala pty) can you can clone either of them.
2004-02-21 20:29:52 +00:00
/*
* Helper functions for cloning device drivers.
*
* The objective here is to make it unnecessary for the device drivers to
* use rman or similar to manage their unit number space. Due to the way
* we do "on-demand" devices, using rman or other "private" methods
* will be very tricky to lock down properly once we lock down this file.
*
* Instead we give the drivers these routines which puts the dev_t's that
* are to be managed on their own list, and gives the driver the ability
* to ask for the first free unit number or a given specified unit number.
*
* In addition these routines support paired devices (pty, nmdm and similar)
* by respecting a number of "flag" bits in the minor number.
*
*/
struct clonedevs {
LIST_HEAD(,cdev) head;
};
int
clone_create(struct clonedevs **cdp, struct cdevsw *csw, int *up, dev_t *dp, u_int extra)
{
struct clonedevs *cd;
dev_t dev, dl, de;
int unit, low, u;
KASSERT(!(extra & CLONE_UNITMASK),
("Illegal extra bits (0x%x) in clone_create", extra));
KASSERT(*up <= CLONE_UNITMASK,
("Too high unit (0x%x) in clone_create", *up));
if (csw->d_maj == MAJOR_AUTO)
find_major(csw);
/* if clonedevs have not been initialized, we do it here */
cd = *cdp;
if (cd == NULL) {
cd = malloc(sizeof *cd, M_DEVBUF, M_WAITOK | M_ZERO);
LIST_INIT(&cd->head);
*cdp = cd;
}
/*
* Search the list for a lot of things in one go:
* A preexisting match is returned immediately.
* The lowest free unit number if we are passed -1, and the place
* in the list where we should insert that new element.
* The place to insert a specified unit number, if applicable
* the end of the list.
*/
unit = *up;
low = 0;
de = dl = NULL;
LIST_FOREACH(dev, &cd->head, si_clone) {
u = dev2unit(dev);
if (u == (unit | extra)) {
*dp = dev;
return (0);
}
if (unit == -1 && u == low) {
low++;
de = dev;
continue;
}
if (u > unit) {
dl = dev;
break;
}
de = dev;
}
if (unit == -1)
unit = low;
dev = makedev(csw->d_maj, unit2minor(unit | extra));
KASSERT(!(dev->si_flags & SI_CLONELIST),
("Dev %p should not be on clonelist", dev));
if (dl != NULL)
LIST_INSERT_BEFORE(dl, dev, si_clone);
else if (de != NULL)
LIST_INSERT_AFTER(de, dev, si_clone);
else
LIST_INSERT_HEAD(&cd->head, dev, si_clone);
dev->si_flags |= SI_CLONELIST;
*up = unit;
return (1);
}
/*
* Kill everything still on the list. The driver should already have
* disposed of any softc hung of the dev_t's at this time.
*/
void
clone_cleanup(struct clonedevs **cdp)
{
dev_t dev, tdev;
struct clonedevs *cd;
cd = *cdp;
if (cd == NULL)
return;
LIST_FOREACH_SAFE(dev, &cd->head, si_clone, tdev) {
KASSERT(dev->si_flags & SI_NAMED,
("Driver has goofed in cloning underways udev %x", dev->si_udev));
destroy_dev(dev);
}
free(cd, M_DEVBUF);
*cdp = NULL;
}
Add code to devname(3) so it can find the names of devices which were not present when dev_mkdb(8) was run. First the dev_mkdb(8) database is searched, this caters for non-DEVFS cases where people have renamed a device. If that fails we ask the kernel using sysctl kern.devname if the device driver has put a name in the dev_t. This covers DEVFS cloned devices. If that also fails we format a string which isn't entirely useless.
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);
Convert a Debugger(3) to a panic(9) and a EINVAL. Reminded by: bde
2001-01-21 21:19:49 +00:00
if (ud == NOUDEV)
return(EINVAL);
Device megapatch 6/6: This is what we came here for: Hang dev_t's from their cdevsw, refcount cdevsw and dev_t and generally keep track of things a lot better than we used to: Hold a cdevsw reference around all entrances into the device driver, this will be necessary to safely determine when we can unload driver code. Hold a dev_t reference while the device is open. KASSERT that we do not enter the driver on a non-referenced dev_t. Remove old D_NAG code, anonymous dev_t's are not a problem now. When destroy_dev() is called on a referenced dev_t, move it to dead_cdevsw's list. When the refcount drops, free it. Check that cdevsw->d_version is correct. If not, set all methods to the dead_*() methods to prevent entrance into driver. Print warning on console to this effect. The device driver may still explode if it is also incompatible with newbus, but in that case we probably didn't get this far in the first place.
2004-02-21 21:57:26 +00:00
dev = udev2dev(ud);
if (dev == NODEV)
Add code to devname(3) so it can find the names of devices which were not present when dev_mkdb(8) was run. First the dev_mkdb(8) database is searched, this caters for non-DEVFS cases where people have renamed a device. If that fails we ask the kernel using sysctl kern.devname if the device driver has put a name in the dev_t. This covers DEVFS cloned devices. If that also fails we format a string which isn't entirely useless.
2000-09-09 11:39:59 +00:00
error = ENOENT;
else
error = SYSCTL_OUT(req, dev->si_name, strlen(dev->si_name) + 1);
return (error);
}
Allow all users to access the dev -> devname sysctl.
2000-10-29 19:50:06 +00:00
SYSCTL_PROC(_kern, OID_AUTO, devname, CTLTYPE_OPAQUE|CTLFLAG_RW|CTLFLAG_ANYBODY,
Add code to devname(3) so it can find the names of devices which were not present when dev_mkdb(8) was run. First the dev_mkdb(8) database is searched, this caters for non-DEVFS cases where people have renamed a device. If that fails we ask the kernel using sysctl kern.devname if the device driver has put a name in the dev_t. This covers DEVFS cloned devices. If that also fails we format a string which isn't entirely useless.
2000-09-09 11:39:59 +00:00
NULL, 0, sysctl_devname, "", "devname(3) handler");
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