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d3ce832719
When I changed kern_conf.c three months ago I made device unit numbers equal to (unneeded) device minor numbers. We used to require bitshifting, because there were eight bits in the middle that were reserved for a device major number. Not very long after I turned dev2unit(), minor(), unit2minor() and minor2unit() into macro's. The unit2minor() and minor2unit() macro's were no-ops. We'd better not remove these four macro's from the kernel, because there is a lot of (external) code that may still depend on them. For now it's harmless to remove all invocations of unit2minor() and minor2unit(). Reviewed by: kib
149 lines
4 KiB
C
149 lines
4 KiB
C
/*-
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* Coda: an Experimental Distributed File System
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* Release 3.1
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*
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* Copyright (c) 1987-1998 Carnegie Mellon University
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* All Rights Reserved
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*
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* Permission to use, copy, modify and distribute this software and its
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* documentation is hereby granted, provided that both the copyright
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* notice and this permission notice appear in all copies of the
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* software, derivative works or modified versions, and any portions
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* thereof, and that both notices appear in supporting documentation, and
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* that credit is given to Carnegie Mellon University in all documents
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* and publicity pertaining to direct or indirect use of this code or its
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* derivatives.
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*
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* CODA IS AN EXPERIMENTAL SOFTWARE SYSTEM AND IS KNOWN TO HAVE BUGS,
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* SOME OF WHICH MAY HAVE SERIOUS CONSEQUENCES. CARNEGIE MELLON ALLOWS
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* FREE USE OF THIS SOFTWARE IN ITS "AS IS" CONDITION. CARNEGIE MELLON
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* DISCLAIMS ANY LIABILITY OF ANY KIND FOR ANY DAMAGES WHATSOEVER
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* RESULTING DIRECTLY OR INDIRECTLY FROM THE USE OF THIS SOFTWARE OR OF
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* ANY DERIVATIVE WORK.
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*
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* Carnegie Mellon encourages users of this software to return any
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* improvements or extensions that they make, and to grant Carnegie
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* Mellon the rights to redistribute these changes without encumbrance.
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*
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* @(#) src/sys/coda/coda_fbsd.cr,v 1.1.1.1 1998/08/29 21:14:52 rvb Exp $
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/conf.h>
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#include <sys/fcntl.h>
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#include <sys/kernel.h>
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#include <sys/lock.h>
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#include <sys/malloc.h>
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#include <sys/module.h>
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#include <sys/ucred.h>
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#include <sys/vnode.h>
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#include <vm/vm.h>
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#include <vm/vnode_pager.h>
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#include <fs/coda/coda.h>
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#include <fs/coda/cnode.h>
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#include <fs/coda/coda_vnops.h>
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#include <fs/coda/coda_psdev.h>
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static struct cdevsw codadevsw = {
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.d_version = D_VERSION,
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.d_flags = D_NEEDGIANT,
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.d_open = vc_open,
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.d_close = vc_close,
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.d_read = vc_read,
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.d_write = vc_write,
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.d_ioctl = vc_ioctl,
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.d_poll = vc_poll,
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.d_name = "coda",
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};
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static eventhandler_tag clonetag;
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static LIST_HEAD(, coda_mntinfo) coda_mnttbl;
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/*
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* For DEVFS, using bpf & tun drivers as examples.
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*
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* XXX: Why use a cloned interface, aren't we really just interested in
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* having a single /dev/cfs0? It's not clear the coda module knows what to
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* do with more than one.
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*/
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static void coda_fbsd_clone(void *arg, struct ucred *cred, char *name,
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int namelen, struct cdev **dev);
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static int
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codadev_modevent(module_t mod, int type, void *data)
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{
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struct coda_mntinfo *mnt;
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switch (type) {
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case MOD_LOAD:
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LIST_INIT(&coda_mnttbl);
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clonetag = EVENTHANDLER_REGISTER(dev_clone, coda_fbsd_clone,
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0, 1000);
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break;
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case MOD_UNLOAD:
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/*
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* XXXRW: At the very least, a busy check should occur here
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* to prevent untimely unload. Much more serious collection
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* of allocated memory needs to take place; right now we leak
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* like a sieve.
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*/
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EVENTHANDLER_DEREGISTER(dev_clone, clonetag);
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while ((mnt = LIST_FIRST(&coda_mnttbl)) != NULL) {
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LIST_REMOVE(mnt, mi_list);
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destroy_dev(mnt->dev);
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free(mnt, M_CODA);
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}
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break;
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default:
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return (EOPNOTSUPP);
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}
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return (0);
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}
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static moduledata_t codadev_mod = {
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"codadev",
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codadev_modevent,
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NULL
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};
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DECLARE_MODULE(codadev, codadev_mod, SI_SUB_DRIVERS, SI_ORDER_MIDDLE);
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static void
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coda_fbsd_clone(void *arg, struct ucred *cred, char *name, int namelen,
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struct cdev **dev)
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{
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struct coda_mntinfo *mnt;
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int u;
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if (*dev != NULL)
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return;
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if (dev_stdclone(name, NULL, "cfs", &u) != 1)
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return;
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*dev = make_dev(&codadevsw, u, UID_ROOT, GID_WHEEL, 0600,
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"cfs%d", u);
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dev_ref(*dev);
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mnt = malloc(sizeof(struct coda_mntinfo), M_CODA, M_WAITOK|M_ZERO);
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LIST_INSERT_HEAD(&coda_mnttbl, mnt, mi_list);
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mnt->dev = *dev;
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}
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struct coda_mntinfo *
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dev2coda_mntinfo(struct cdev *dev)
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{
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struct coda_mntinfo *mnt;
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LIST_FOREACH(mnt, &coda_mnttbl, mi_list) {
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if (mnt->dev == dev)
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return (mnt);
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}
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return (NULL);
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}
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