Current Path : /sys/fs/coda/ |
FreeBSD hs32.drive.ne.jp 9.1-RELEASE FreeBSD 9.1-RELEASE #1: Wed Jan 14 12:18:08 JST 2015 root@hs32.drive.ne.jp:/sys/amd64/compile/hs32 amd64 |
Current File : //sys/fs/coda/coda_fbsd.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: release/9.1.0/sys/fs/coda/coda_fbsd.c 183381 2008-09-26 14:19:52Z ed $"); #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 <fs/coda/coda.h> #include <fs/coda/cnode.h> #include <fs/coda/coda_vnops.h> #include <fs/coda/coda_psdev.h> static struct cdevsw codadevsw = { .d_version = D_VERSION, .d_flags = D_NEEDGIANT, .d_open = vc_open, .d_close = vc_close, .d_read = vc_read, .d_write = vc_write, .d_ioctl = vc_ioctl, .d_poll = vc_poll, .d_name = "coda", }; static eventhandler_tag clonetag; static LIST_HEAD(, coda_mntinfo) coda_mnttbl; /* * For DEVFS, using bpf & tun drivers as examples. * * XXX: Why use a cloned interface, aren't we really just interested in * having a single /dev/cfs0? It's not clear the coda module knows what to * do with more than one. */ 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: /* * XXXRW: At the very least, a busy check should occur here * to prevent untimely unload. Much more serious collection * of allocated memory needs to take place; right now we leak * like a sieve. */ 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(void *arg, struct ucred *cred, char *name, int namelen, struct cdev **dev) { struct coda_mntinfo *mnt; int u; if (*dev != NULL) return; if (dev_stdclone(name, NULL, "cfs", &u) != 1) return; *dev = make_dev(&codadevsw, 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); mnt->dev = *dev; } struct coda_mntinfo * dev2coda_mntinfo(struct cdev *dev) { struct coda_mntinfo *mnt; LIST_FOREACH(mnt, &coda_mnttbl, mi_list) { if (mnt->dev == dev) return (mnt); } return (NULL); }