diff options
| -rw-r--r-- | sys/kern/spec_vnops.c | 96 |
1 files changed, 93 insertions, 3 deletions
diff --git a/sys/kern/spec_vnops.c b/sys/kern/spec_vnops.c index faae895fb1f..46e94768ccf 100644 --- a/sys/kern/spec_vnops.c +++ b/sys/kern/spec_vnops.c @@ -1,4 +1,4 @@ -/* $OpenBSD: spec_vnops.c,v 1.65 2011/07/04 17:12:53 nicm Exp $ */ +/* $OpenBSD: spec_vnops.c,v 1.66 2011/07/04 20:51:19 deraadt Exp $ */ /* $NetBSD: spec_vnops.c,v 1.29 1996/04/22 01:42:38 christos Exp $ */ /* @@ -49,8 +49,8 @@ #include <sys/lockf.h> #include <sys/poll.h> #include <sys/dkio.h> - -#include <miscfs/specfs/specdev.h> +#include <sys/malloc.h> +#include <sys/specdev.h> #define v_lastr v_specinfo->si_lastr @@ -652,3 +652,93 @@ spec_badop(void *v) panic("spec_badop called"); /* NOTREACHED */ } + +/* + * Copyright (c) 2006 Pedro Martelletto <pedro@ambientworks.net> + * Copyright (c) 2006 Thordur Bjornsson <thib@openbsd.org> + * + * Permission to use, copy, modify, and distribute this software for any + * purpose with or without fee is hereby granted, provided that the above + * copyright notice and this permission notice appear in all copies. + * + * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES + * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF + * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR + * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES + * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN + * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF + * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. + */ + +#ifdef CLONE_DEBUG +#define DNPRINTF(m...) do { printf(m); } while (0) +#else +#define DNPRINTF(m...) /* nothing */ +#endif + +int +spec_open_clone(struct vop_open_args *ap) +{ + struct vnode *cvp, *vp = ap->a_vp; + struct cloneinfo *cip; + int error, i; + + DNPRINTF("cloning vnode\n"); + + for (i = 1; i < sizeof(vp->v_specbitmap) * NBBY; i++) + if (isclr(vp->v_specbitmap, i)) { + setbit(vp->v_specbitmap, i); + break; + } + + if (i == sizeof(vp->v_specbitmap) * NBBY) + return (EBUSY); /* too many open instances */ + + error = cdevvp(makedev(major(vp->v_rdev), i), &cvp); + if (error) + return (error); /* out of vnodes */ + + VOP_UNLOCK(vp, 0, ap->a_p); + + error = cdevsw[major(vp->v_rdev)].d_open(cvp->v_rdev, ap->a_mode, + S_IFCHR, ap->a_p); + + vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, ap->a_p); + + if (error) { + clrbit(vp->v_specbitmap, i); + return (error); /* device open failed */ + } + + cvp->v_flag |= VCLONE; + + cip = malloc(sizeof(struct cloneinfo), M_TEMP, M_WAITOK); + cip->ci_data = vp->v_data; + cip->ci_vp = cvp; + + cvp->v_specparent = vp; + vp->v_flag |= VCLONED; + vp->v_data = cip; + + DNPRINTF("clone of vnode %p is vnode %p\n", vp, cvp); + + return (0); /* device cloned */ +} + +int +spec_close_clone(struct vop_close_args *ap) +{ + struct vnode *pvp, *vp = ap->a_vp; + int error; + + error = cdevsw[major(vp->v_rdev)].d_close(vp->v_rdev, ap->a_fflag, + S_IFCHR, ap->a_p); + if (error) + return (error); /* device close failed */ + + pvp = vp->v_specparent; /* get parent device */ + clrbit(pvp->v_specbitmap, minor(vp->v_rdev)); + vrele(pvp); + + return (0); /* clone closed */ +} |