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Annotation of sys/miscfs/specfs/spec_subr.c, Revision 1.1.1.1

1.1       nbrk        1: /*     $OpenBSD: spec_subr.c,v 1.2 2006/06/02 20:49:08 pedro Exp $     */
                      2:
                      3: /*
                      4:  * Copyright (c) 2006 Pedro Martelletto <pedro@openbsd.org>
                      5:  * Copyright (c) 2006 Thordur Bjornsson <thib@openbsd.org>
                      6:  *
                      7:  * Permission to use, copy, modify, and distribute this software for any
                      8:  * purpose with or without fee is hereby granted, provided that the above
                      9:  * copyright notice and this permission notice appear in all copies.
                     10:  *
                     11:  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
                     12:  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
                     13:  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
                     14:  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
                     15:  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
                     16:  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
                     17:  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
                     18:  */
                     19:
                     20: #include <sys/param.h>
                     21: #include <sys/vnode.h>
                     22: #include <sys/malloc.h>
                     23: #include <sys/conf.h>
                     24: #include <sys/stat.h>
                     25:
                     26: #include <miscfs/specfs/specdev.h>
                     27:
                     28: int
                     29: spec_open_clone(struct vop_open_args *ap)
                     30: {
                     31:        struct vnode *cvp, *vp = ap->a_vp;
                     32:        struct cloneinfo *cip;
                     33:        int error, i;
                     34:
                     35:        for (i = 1; i < sizeof(vp->v_specbitmap) * NBBY; i++)
                     36:                if (isclr(vp->v_specbitmap, i)) {
                     37:                        setbit(vp->v_specbitmap, i);
                     38:                        break;
                     39:                }
                     40:
                     41:        if (i == sizeof(vp->v_specbitmap) * NBBY)
                     42:                return (EBUSY); /* too many open instances */
                     43:
                     44:        printf("spec_open_clone(): cloning device (%d, %d) for pid %u\n",
                     45:            major(vp->v_rdev), minor(vp->v_rdev), curproc->p_pid);
                     46:
                     47:        error = cdevvp(makedev(major(vp->v_rdev), i), &cvp);
                     48:        if (error)
                     49:                return (error); /* out of vnodes */
                     50:
                     51:        VOP_UNLOCK(vp, 0, ap->a_p);
                     52:
                     53:        error = cdevsw[major(vp->v_rdev)].d_open(cvp->v_rdev, ap->a_mode,
                     54:            S_IFCHR, ap->a_p);
                     55:
                     56:        vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, ap->a_p);
                     57:
                     58:        if (error) {
                     59:                 clrbit(vp->v_specbitmap, i);
                     60:                 return (error); /* device open failed */
                     61:        }
                     62:
                     63:        cip = malloc(sizeof(struct cloneinfo), M_TEMP, M_WAITOK);
                     64:        cip->ci_data = vp->v_data;
                     65:        cip->ci_vp = cvp;
                     66:
                     67:        cvp->v_specparent = vp;
                     68:        vp->v_flag |= VCLONED;
                     69:        vp->v_data = cip;
                     70:
                     71:        printf("spec_open_clone(): new minor for cloned device is %d\n",
                     72:            minor(cvp->v_rdev));
                     73:
                     74:        return (0); /* device cloned */
                     75: }
                     76:
                     77: int
                     78: spec_close_clone(struct vop_close_args *ap)
                     79: {
                     80:        struct vnode *pvp, *vp = ap->a_vp;
                     81:        int error;
                     82:
                     83:        error = cdevsw[major(vp->v_rdev)].d_close(vp->v_rdev, ap->a_fflag,
                     84:            S_IFCHR, ap->a_p);
                     85:        if (error)
                     86:                return (error); /* device close failed */
                     87:
                     88:        pvp = vp->v_specparent; /* get parent device */
                     89:        clrbit(pvp->v_specbitmap, minor(vp->v_rdev));
                     90:
                     91:        printf("spec_close_clone(): freeing minor %d of dev %d for"
                     92:            " pid %u\n", minor(vp->v_rdev), major(vp->v_rdev), curproc->p_pid);
                     93:
                     94:        return (0); /* clone closed */
                     95: }