mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-24 11:29:10 +00:00
6a113b3de7
event handler, dev_clone, which accepts a credential argument. Implementors of the event can ignore it if they're not interested, and most do. This avoids having multiple event handler types and fall-back/precedence logic in devfs. This changes the kernel API for /dev cloning, and may affect third party packages containg cloning kernel modules. Requested by: phk MFC after: 3 days
141 lines
3.7 KiB
C
141 lines
3.7 KiB
C
/*-
|
|
* Coda: an Experimental Distributed File System
|
|
* Release 3.1
|
|
*
|
|
* Copyright (c) 1987-1998 Carnegie Mellon University
|
|
* All Rights Reserved
|
|
*
|
|
* Permission to use, copy, modify and distribute this software and its
|
|
* documentation is hereby granted, provided that both the copyright
|
|
* notice and this permission notice appear in all copies of the
|
|
* software, derivative works or modified versions, and any portions
|
|
* thereof, and that both notices appear in supporting documentation, and
|
|
* that credit is given to Carnegie Mellon University in all documents
|
|
* and publicity pertaining to direct or indirect use of this code or its
|
|
* derivatives.
|
|
*
|
|
* CODA IS AN EXPERIMENTAL SOFTWARE SYSTEM AND IS KNOWN TO HAVE BUGS,
|
|
* SOME OF WHICH MAY HAVE SERIOUS CONSEQUENCES. CARNEGIE MELLON ALLOWS
|
|
* FREE USE OF THIS SOFTWARE IN ITS "AS IS" CONDITION. CARNEGIE MELLON
|
|
* DISCLAIMS ANY LIABILITY OF ANY KIND FOR ANY DAMAGES WHATSOEVER
|
|
* RESULTING DIRECTLY OR INDIRECTLY FROM THE USE OF THIS SOFTWARE OR OF
|
|
* ANY DERIVATIVE WORK.
|
|
*
|
|
* Carnegie Mellon encourages users of this software to return any
|
|
* improvements or extensions that they make, and to grant Carnegie
|
|
* Mellon the rights to redistribute these changes without encumbrance.
|
|
*
|
|
* @(#) src/sys/coda/coda_fbsd.cr,v 1.1.1.1 1998/08/29 21:14:52 rvb Exp $
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/conf.h>
|
|
#include <sys/fcntl.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/lock.h>
|
|
#include <sys/malloc.h>
|
|
#include <sys/module.h>
|
|
#include <sys/ucred.h>
|
|
#include <sys/vnode.h>
|
|
|
|
#include <vm/vm.h>
|
|
#include <vm/vnode_pager.h>
|
|
|
|
#include <coda/coda.h>
|
|
#include <coda/cnode.h>
|
|
#include <coda/coda_vnops.h>
|
|
#include <coda/coda_psdev.h>
|
|
|
|
static struct cdevsw codadevsw = {
|
|
.d_version = D_VERSION,
|
|
.d_flags = D_NEEDGIANT,
|
|
.d_open = vc_nb_open,
|
|
.d_close = vc_nb_close,
|
|
.d_read = vc_nb_read,
|
|
.d_write = vc_nb_write,
|
|
.d_ioctl = vc_nb_ioctl,
|
|
.d_poll = vc_nb_poll,
|
|
.d_name = "Coda",
|
|
};
|
|
|
|
static eventhandler_tag clonetag;
|
|
|
|
static LIST_HEAD(, coda_mntinfo) coda_mnttbl;
|
|
|
|
int vcdebug = 1;
|
|
#define VCDEBUG if (vcdebug) printf
|
|
|
|
/* for DEVFS, using bpf & tun drivers as examples*/
|
|
static void coda_fbsd_clone(void *arg, struct ucred *cred, char *name,
|
|
int namelen, struct cdev **dev);
|
|
|
|
static int
|
|
codadev_modevent(module_t mod, int type, void *data)
|
|
{
|
|
struct coda_mntinfo *mnt;
|
|
|
|
switch (type) {
|
|
case MOD_LOAD:
|
|
LIST_INIT(&coda_mnttbl);
|
|
clonetag = EVENTHANDLER_REGISTER(dev_clone, coda_fbsd_clone,
|
|
0, 1000);
|
|
break;
|
|
case MOD_UNLOAD:
|
|
EVENTHANDLER_DEREGISTER(dev_clone, clonetag);
|
|
while ((mnt = LIST_FIRST(&coda_mnttbl)) != NULL) {
|
|
LIST_REMOVE(mnt, mi_list);
|
|
destroy_dev(mnt->dev);
|
|
free(mnt, M_CODA);
|
|
}
|
|
break;
|
|
|
|
default:
|
|
return (EOPNOTSUPP);
|
|
}
|
|
return 0;
|
|
}
|
|
static moduledata_t codadev_mod = {
|
|
"codadev",
|
|
codadev_modevent,
|
|
NULL
|
|
};
|
|
DECLARE_MODULE(codadev, codadev_mod, SI_SUB_DRIVERS, SI_ORDER_MIDDLE);
|
|
|
|
static void coda_fbsd_clone(arg, cred, name, namelen, dev)
|
|
void *arg;
|
|
struct ucred *cred;
|
|
char *name;
|
|
int namelen;
|
|
struct cdev **dev;
|
|
{
|
|
int u;
|
|
struct coda_mntinfo *mnt;
|
|
|
|
if (*dev != NULL)
|
|
return;
|
|
if (dev_stdclone(name,NULL,"cfs",&u) != 1)
|
|
return;
|
|
|
|
*dev = make_dev(&codadevsw,unit2minor(u),UID_ROOT,GID_WHEEL,0600,"cfs%d",u);
|
|
dev_ref(*dev);
|
|
mnt = malloc(sizeof(struct coda_mntinfo), M_CODA, M_WAITOK|M_ZERO);
|
|
LIST_INSERT_HEAD(&coda_mnttbl, mnt, mi_list);
|
|
}
|
|
|
|
struct coda_mntinfo *
|
|
dev2coda_mntinfo(struct cdev *dev)
|
|
{
|
|
struct coda_mntinfo *mnt;
|
|
|
|
LIST_FOREACH(mnt, &coda_mnttbl, mi_list) {
|
|
if (mnt->dev == dev)
|
|
break;
|
|
}
|
|
|
|
return mnt;
|
|
}
|