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Annotation of src/sys/miscfs/kernfs/kernfs_vnops.c, Revision 1.85

1.85    ! jdolecek    1: /*     $NetBSD: kernfs_vnops.c,v 1.84 2002/10/12 14:04:45 jdolecek Exp $       */
1.27      cgd         2:
1.1       cgd         3: /*
1.23      mycroft     4:  * Copyright (c) 1992, 1993
                      5:  *     The Regents of the University of California.  All rights reserved.
1.1       cgd         6:  *
1.17      cgd         7:  * This code is derived from software donated to Berkeley by
1.1       cgd         8:  * Jan-Simon Pendry.
                      9:  *
1.2       cgd        10:  * Redistribution and use in source and binary forms, with or without
                     11:  * modification, are permitted provided that the following conditions
                     12:  * are met:
                     13:  * 1. Redistributions of source code must retain the above copyright
                     14:  *    notice, this list of conditions and the following disclaimer.
                     15:  * 2. Redistributions in binary form must reproduce the above copyright
                     16:  *    notice, this list of conditions and the following disclaimer in the
                     17:  *    documentation and/or other materials provided with the distribution.
                     18:  * 3. All advertising materials mentioning features or use of this software
                     19:  *    must display the following acknowledgement:
1.17      cgd        20:  *     This product includes software developed by the University of
                     21:  *     California, Berkeley and its contributors.
1.2       cgd        22:  * 4. Neither the name of the University nor the names of its contributors
                     23:  *    may be used to endorse or promote products derived from this software
                     24:  *    without specific prior written permission.
1.1       cgd        25:  *
1.2       cgd        26:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     27:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     28:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     29:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     30:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     31:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     32:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     33:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     34:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     35:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     36:  * SUCH DAMAGE.
1.1       cgd        37:  *
1.57      fvdl       38:  *     @(#)kernfs_vnops.c      8.15 (Berkeley) 5/21/95
1.1       cgd        39:  */
                     40:
                     41: /*
1.23      mycroft    42:  * Kernel parameter filesystem (/kern)
1.1       cgd        43:  */
1.77      lukem      44:
                     45: #include <sys/cdefs.h>
1.85    ! jdolecek   46: __KERNEL_RCSID(0, "$NetBSD: kernfs_vnops.c,v 1.84 2002/10/12 14:04:45 jdolecek Exp $");
1.55      mrg        47:
1.14      mycroft    48: #include <sys/param.h>
                     49: #include <sys/systm.h>
                     50: #include <sys/kernel.h>
1.23      mycroft    51: #include <sys/vmmeter.h>
1.14      mycroft    52: #include <sys/time.h>
                     53: #include <sys/proc.h>
1.23      mycroft    54: #include <sys/vnode.h>
                     55: #include <sys/malloc.h>
1.14      mycroft    56: #include <sys/file.h>
                     57: #include <sys/stat.h>
                     58: #include <sys/mount.h>
                     59: #include <sys/namei.h>
                     60: #include <sys/buf.h>
1.23      mycroft    61: #include <sys/dirent.h>
1.28      mycroft    62: #include <sys/msgbuf.h>
1.44      mycroft    63:
                     64: #include <miscfs/genfs/genfs.h>
1.17      cgd        65: #include <miscfs/kernfs/kernfs.h>
1.63      mrg        66:
1.54      mrg        67: #include <uvm/uvm_extern.h>
                     68:
1.17      cgd        69: #define KSTRING        256             /* Largest I/O available via this filesystem */
                     70: #define        UIO_MX 32
1.1       cgd        71:
1.23      mycroft    72: #define        READ_MODE       (S_IRUSR|S_IRGRP|S_IROTH)
                     73: #define        WRITE_MODE      (S_IWUSR|S_IRUSR|S_IRGRP|S_IROTH)
                     74: #define DIR_MODE       (S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH)
                     75:
1.75      jdolecek   76: const struct kern_target kern_targets[] = {
1.1       cgd        77: /* NOTE: The name must be less than UIO_MX-16 chars in length */
1.23      mycroft    78: #define N(s) sizeof(s)-1, s
                     79:      /*        name            data          tag           type  ro/rw */
                     80:      { DT_DIR, N("."),         0,            KTT_NULL,     VDIR, DIR_MODE   },
                     81:      { DT_DIR, N(".."),        0,            KTT_NULL,     VDIR, DIR_MODE   },
                     82:      { DT_REG, N("boottime"),  &boottime.tv_sec, KTT_INT,  VREG, READ_MODE  },
1.69      thorpej    83:                        /* XXX cast away const */
                     84:      { DT_REG, N("copyright"), (void *)copyright,
                     85:                                             KTT_STRING,   VREG, READ_MODE  },
1.23      mycroft    86:      { DT_REG, N("hostname"),  0,            KTT_HOSTNAME, VREG, WRITE_MODE },
                     87:      { DT_REG, N("hz"),        &hz,          KTT_INT,      VREG, READ_MODE  },
                     88:      { DT_REG, N("loadavg"),   0,            KTT_AVENRUN,  VREG, READ_MODE  },
1.28      mycroft    89:      { DT_REG, N("msgbuf"),    0,           KTT_MSGBUF,   VREG, READ_MODE  },
1.54      mrg        90:      { DT_REG, N("pagesize"),  &uvmexp.pagesize, KTT_INT,  VREG, READ_MODE  },
1.73      jdolecek   91:      { DT_REG, N("physmem"),   &physmem,     KTT_INT,      VREG, READ_MODE  },
1.17      cgd        92: #if 0
1.23      mycroft    93:      { DT_DIR, N("root"),      0,            KTT_NULL,     VDIR, DIR_MODE   },
1.17      cgd        94: #endif
1.23      mycroft    95:      { DT_BLK, N("rootdev"),   &rootdev,     KTT_DEVICE,   VBLK, READ_MODE  },
                     96:      { DT_CHR, N("rrootdev"),  &rrootdev,    KTT_DEVICE,   VCHR, READ_MODE  },
                     97:      { DT_REG, N("time"),      0,            KTT_TIME,     VREG, READ_MODE  },
1.69      thorpej    98:                        /* XXX cast away const */
                     99:      { DT_REG, N("version"),   (void *)version,
                    100:                                             KTT_STRING,   VREG, READ_MODE  },
1.23      mycroft   101: #undef N
1.1       cgd       102: };
1.17      cgd       103: static int nkern_targets = sizeof(kern_targets) / sizeof(kern_targets[0]);
1.1       cgd       104:
1.41      christos  105: int    kernfs_lookup   __P((void *));
1.85    ! jdolecek  106: #define        kernfs_create   genfs_eopnotsupp
        !           107: #define        kernfs_mknod    genfs_eopnotsupp
1.44      mycroft   108: #define        kernfs_open     genfs_nullop
                    109: #define        kernfs_close    genfs_nullop
1.41      christos  110: int    kernfs_access   __P((void *));
                    111: int    kernfs_getattr  __P((void *));
                    112: int    kernfs_setattr  __P((void *));
                    113: int    kernfs_read     __P((void *));
                    114: int    kernfs_write    __P((void *));
1.65      wrstuden  115: #define        kernfs_fcntl    genfs_fcntl
1.61      matthias  116: #define        kernfs_ioctl    genfs_enoioctl
1.45      mycroft   117: #define        kernfs_poll     genfs_poll
1.57      fvdl      118: #define kernfs_revoke  genfs_revoke
1.44      mycroft   119: #define        kernfs_fsync    genfs_nullop
                    120: #define        kernfs_seek     genfs_nullop
1.85    ! jdolecek  121: #define        kernfs_remove   genfs_eopnotsupp
1.41      christos  122: int    kernfs_link     __P((void *));
1.85    ! jdolecek  123: #define        kernfs_rename   genfs_eopnotsupp
        !           124: #define        kernfs_mkdir    genfs_eopnotsupp
        !           125: #define        kernfs_rmdir    genfs_eopnotsupp
1.41      christos  126: int    kernfs_symlink  __P((void *));
                    127: int    kernfs_readdir  __P((void *));
1.44      mycroft   128: #define        kernfs_readlink genfs_eopnotsupp
                    129: #define        kernfs_abortop  genfs_abortop
1.41      christos  130: int    kernfs_inactive __P((void *));
                    131: int    kernfs_reclaim  __P((void *));
1.64      wrstuden  132: #define        kernfs_lock     genfs_lock
                    133: #define        kernfs_unlock   genfs_unlock
1.44      mycroft   134: #define        kernfs_bmap     genfs_badop
                    135: #define        kernfs_strategy genfs_badop
1.41      christos  136: int    kernfs_print    __P((void *));
1.64      wrstuden  137: #define        kernfs_islocked genfs_islocked
1.41      christos  138: int    kernfs_pathconf __P((void *));
1.62      kleink    139: #define        kernfs_advlock  genfs_einval
1.44      mycroft   140: #define        kernfs_blkatoff genfs_eopnotsupp
                    141: #define        kernfs_valloc   genfs_eopnotsupp
                    142: #define        kernfs_vfree    genfs_nullop
                    143: #define        kernfs_truncate genfs_eopnotsupp
                    144: #define        kernfs_update   genfs_nullop
                    145: #define        kernfs_bwrite   genfs_eopnotsupp
1.79      chs       146: #define        kernfs_putpages genfs_putpages
1.41      christos  147:
1.82      jdolecek  148: static int     kernfs_xread __P((const struct kern_target *, int, char **, size_t, size_t *));
                    149: static int     kernfs_xwrite __P((const struct kern_target *, char *, size_t));
1.41      christos  150:
                    151: int (**kernfs_vnodeop_p) __P((void *));
1.71      jdolecek  152: const struct vnodeopv_entry_desc kernfs_vnodeop_entries[] = {
1.41      christos  153:        { &vop_default_desc, vn_default_error },
1.44      mycroft   154:        { &vop_lookup_desc, kernfs_lookup },            /* lookup */
                    155:        { &vop_create_desc, kernfs_create },            /* create */
                    156:        { &vop_mknod_desc, kernfs_mknod },              /* mknod */
                    157:        { &vop_open_desc, kernfs_open },                /* open */
                    158:        { &vop_close_desc, kernfs_close },              /* close */
                    159:        { &vop_access_desc, kernfs_access },            /* access */
                    160:        { &vop_getattr_desc, kernfs_getattr },          /* getattr */
                    161:        { &vop_setattr_desc, kernfs_setattr },          /* setattr */
                    162:        { &vop_read_desc, kernfs_read },                /* read */
                    163:        { &vop_write_desc, kernfs_write },              /* write */
1.65      wrstuden  164:        { &vop_fcntl_desc, kernfs_fcntl },              /* fcntl */
1.44      mycroft   165:        { &vop_ioctl_desc, kernfs_ioctl },              /* ioctl */
1.45      mycroft   166:        { &vop_poll_desc, kernfs_poll },                /* poll */
1.57      fvdl      167:        { &vop_revoke_desc, kernfs_revoke },            /* revoke */
1.44      mycroft   168:        { &vop_fsync_desc, kernfs_fsync },              /* fsync */
                    169:        { &vop_seek_desc, kernfs_seek },                /* seek */
                    170:        { &vop_remove_desc, kernfs_remove },            /* remove */
                    171:        { &vop_link_desc, kernfs_link },                /* link */
                    172:        { &vop_rename_desc, kernfs_rename },            /* rename */
                    173:        { &vop_mkdir_desc, kernfs_mkdir },              /* mkdir */
                    174:        { &vop_rmdir_desc, kernfs_rmdir },              /* rmdir */
                    175:        { &vop_symlink_desc, kernfs_symlink },          /* symlink */
                    176:        { &vop_readdir_desc, kernfs_readdir },          /* readdir */
                    177:        { &vop_readlink_desc, kernfs_readlink },        /* readlink */
                    178:        { &vop_abortop_desc, kernfs_abortop },          /* abortop */
                    179:        { &vop_inactive_desc, kernfs_inactive },        /* inactive */
                    180:        { &vop_reclaim_desc, kernfs_reclaim },          /* reclaim */
                    181:        { &vop_lock_desc, kernfs_lock },                /* lock */
                    182:        { &vop_unlock_desc, kernfs_unlock },            /* unlock */
                    183:        { &vop_bmap_desc, kernfs_bmap },                /* bmap */
                    184:        { &vop_strategy_desc, kernfs_strategy },        /* strategy */
                    185:        { &vop_print_desc, kernfs_print },              /* print */
                    186:        { &vop_islocked_desc, kernfs_islocked },        /* islocked */
                    187:        { &vop_pathconf_desc, kernfs_pathconf },        /* pathconf */
                    188:        { &vop_advlock_desc, kernfs_advlock },          /* advlock */
                    189:        { &vop_blkatoff_desc, kernfs_blkatoff },        /* blkatoff */
                    190:        { &vop_valloc_desc, kernfs_valloc },            /* valloc */
                    191:        { &vop_vfree_desc, kernfs_vfree },              /* vfree */
                    192:        { &vop_truncate_desc, kernfs_truncate },        /* truncate */
                    193:        { &vop_update_desc, kernfs_update },            /* update */
                    194:        { &vop_bwrite_desc, kernfs_bwrite },            /* bwrite */
1.79      chs       195:        { &vop_putpages_desc, kernfs_putpages },        /* putpages */
1.76      chs       196:        { NULL, NULL }
1.41      christos  197: };
1.71      jdolecek  198: const struct vnodeopv_desc kernfs_vnodeop_opv_desc =
1.41      christos  199:        { &kernfs_vnodeop_p, kernfs_vnodeop_entries };
                    200:
1.82      jdolecek  201: static int
                    202: kernfs_xread(kt, off, bufp, len, wrlen)
1.75      jdolecek  203:        const struct kern_target *kt;
1.28      mycroft   204:        int off;
                    205:        char **bufp;
1.82      jdolecek  206:        size_t len;
                    207:        size_t *wrlen;
1.1       cgd       208: {
                    209:
                    210:        switch (kt->kt_tag) {
                    211:        case KTT_TIME: {
                    212:                struct timeval tv;
1.28      mycroft   213:
1.1       cgd       214:                microtime(&tv);
1.47      christos  215:                sprintf(*bufp, "%ld %ld\n", tv.tv_sec, tv.tv_usec);
1.1       cgd       216:                break;
                    217:        }
                    218:
                    219:        case KTT_INT: {
                    220:                int *ip = kt->kt_data;
1.28      mycroft   221:
1.47      christos  222:                sprintf(*bufp, "%d\n", *ip);
1.1       cgd       223:                break;
                    224:        }
                    225:
                    226:        case KTT_STRING: {
                    227:                char *cp = kt->kt_data;
                    228:
1.28      mycroft   229:                *bufp = cp;
                    230:                break;
                    231:        }
1.1       cgd       232:
1.28      mycroft   233:        case KTT_MSGBUF: {
                    234:                long n;
                    235:
1.52      leo       236:                /*
                    237:                 * deal with cases where the message buffer has
                    238:                 * become corrupted.
                    239:                 */
                    240:                if (!msgbufenabled || msgbufp->msg_magic != MSG_MAGIC) {
                    241:                        msgbufenabled = 0;
                    242:                        return (ENXIO);
                    243:                }
                    244:
                    245:                /*
                    246:                 * Note that reads of /kern/msgbuf won't necessarily yield
                    247:                 * consistent results, if the message buffer is modified
                    248:                 * while the read is in progress.  The worst that can happen
                    249:                 * is that incorrect data will be read.  There's no way
                    250:                 * that this can crash the system unless the values in the
                    251:                 * message buffer header are corrupted, but that'll cause
                    252:                 * the system to die anyway.
                    253:                 */
1.82      jdolecek  254:                if (off >= msgbufp->msg_bufs) {
                    255:                        *wrlen = 0;
1.28      mycroft   256:                        return (0);
1.82      jdolecek  257:                }
1.28      mycroft   258:                n = msgbufp->msg_bufx + off;
1.52      leo       259:                if (n >= msgbufp->msg_bufs)
                    260:                        n -= msgbufp->msg_bufs;
                    261:                len = min(msgbufp->msg_bufs - n, msgbufp->msg_bufs - off);
1.28      mycroft   262:                *bufp = msgbufp->msg_bufc + n;
1.82      jdolecek  263:                *wrlen = len;
                    264:                return (0);
1.1       cgd       265:        }
                    266:
                    267:        case KTT_HOSTNAME: {
                    268:                char *cp = hostname;
                    269:                int xlen = hostnamelen;
                    270:
1.17      cgd       271:                if (xlen >= (len-2))
1.1       cgd       272:                        return (EINVAL);
                    273:
1.60      perry     274:                memcpy(*bufp, cp, xlen);
1.28      mycroft   275:                (*bufp)[xlen] = '\n';
                    276:                (*bufp)[xlen+1] = '\0';
1.1       cgd       277:                break;
                    278:        }
                    279:
                    280:        case KTT_AVENRUN:
1.31      mycroft   281:                averunnable.fscale = FSCALE;
1.47      christos  282:                sprintf(*bufp, "%d %d %d %ld\n",
1.23      mycroft   283:                    averunnable.ldavg[0], averunnable.ldavg[1],
                    284:                    averunnable.ldavg[2], averunnable.fscale);
1.1       cgd       285:                break;
                    286:
                    287:        default:
1.82      jdolecek  288:                *wrlen = 0;
1.28      mycroft   289:                return (0);
1.1       cgd       290:        }
                    291:
1.28      mycroft   292:        len = strlen(*bufp);
                    293:        if (len <= off)
1.82      jdolecek  294:                *wrlen = 0;
                    295:        else {
                    296:                *bufp += off;
                    297:                *wrlen = len - off;
                    298:        }
                    299:        return (0);
1.1       cgd       300: }
                    301:
1.82      jdolecek  302: static int
1.1       cgd       303: kernfs_xwrite(kt, buf, len)
1.75      jdolecek  304:        const struct kern_target *kt;
1.1       cgd       305:        char *buf;
1.82      jdolecek  306:        size_t len;
1.1       cgd       307: {
1.23      mycroft   308:
1.1       cgd       309:        switch (kt->kt_tag) {
1.23      mycroft   310:        case KTT_HOSTNAME:
1.1       cgd       311:                if (buf[len-1] == '\n')
                    312:                        --len;
1.60      perry     313:                memcpy(hostname, buf, len);
1.17      cgd       314:                hostname[len] = '\0';
1.82      jdolecek  315:                hostnamelen = (size_t) len;
1.1       cgd       316:                return (0);
                    317:
                    318:        default:
                    319:                return (EIO);
                    320:        }
                    321: }
                    322:
1.17      cgd       323:
                    324: /*
1.1       cgd       325:  * vp is the current namei directory
                    326:  * ndp is the name to locate in that directory...
                    327:  */
1.41      christos  328: int
                    329: kernfs_lookup(v)
                    330:        void *v;
                    331: {
1.23      mycroft   332:        struct vop_lookup_args /* {
                    333:                struct vnode * a_dvp;
                    334:                struct vnode ** a_vpp;
                    335:                struct componentname * a_cnp;
1.41      christos  336:        } */ *ap = v;
1.23      mycroft   337:        struct componentname *cnp = ap->a_cnp;
                    338:        struct vnode **vpp = ap->a_vpp;
                    339:        struct vnode *dvp = ap->a_dvp;
1.48      cgd       340:        const char *pname = cnp->cn_nameptr;
1.75      jdolecek  341:        const struct kern_target *kt;
1.1       cgd       342:        struct vnode *fvp;
1.64      wrstuden  343:        int error, i, wantpunlock;
1.1       cgd       344:
                    345: #ifdef KERNFS_DIAGNOSTIC
1.51      christos  346:        printf("kernfs_lookup(%p)\n", ap);
                    347:        printf("kernfs_lookup(dp = %p, vpp = %p, cnp = %p)\n", dvp, vpp, ap->a_cnp);
1.47      christos  348:        printf("kernfs_lookup(%s)\n", pname);
1.1       cgd       349: #endif
1.23      mycroft   350:
1.35      mycroft   351:        *vpp = NULLVP;
1.64      wrstuden  352:        cnp->cn_flags &= ~PDIRUNLOCK;
1.35      mycroft   353:
                    354:        if (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME)
                    355:                return (EROFS);
                    356:
1.23      mycroft   357:        if (cnp->cn_namelen == 1 && *pname == '.') {
                    358:                *vpp = dvp;
1.1       cgd       359:                VREF(dvp);
                    360:                return (0);
                    361:        }
1.13      cgd       362:
1.64      wrstuden  363:        /*
                    364:         * This code only supports a flat directory, so we don't
                    365:         * need to worry about ..
                    366:         */
                    367:
1.17      cgd       368: #if 0
1.60      perry     369:        if (cnp->cn_namelen == 4 && memcmp(pname, "root", 4) == 0) {
1.23      mycroft   370:                *vpp = rootdir;
1.17      cgd       371:                VREF(rootdir);
1.57      fvdl      372:                vn_lock(rootdir, LK_SHARED | LK_RETRY);
1.1       cgd       373:                return (0);
                    374:        }
1.13      cgd       375: #endif
1.25      mycroft   376:
1.64      wrstuden  377:        wantpunlock = (~cnp->cn_flags & (LOCKPARENT | ISLASTCN));
                    378:
1.35      mycroft   379:        for (kt = kern_targets, i = 0; i < nkern_targets; kt++, i++) {
1.26      mycroft   380:                if (cnp->cn_namelen == kt->kt_namlen &&
1.60      perry     381:                    memcmp(kt->kt_name, pname, cnp->cn_namelen) == 0)
1.35      mycroft   382:                        goto found;
1.1       cgd       383:        }
                    384:
                    385: #ifdef KERNFS_DIAGNOSTIC
1.47      christos  386:        printf("kernfs_lookup: i = %d, failed", i);
1.1       cgd       387: #endif
                    388:
1.35      mycroft   389:        return (cnp->cn_nameiop == LOOKUP ? ENOENT : EROFS);
1.23      mycroft   390:
1.35      mycroft   391: found:
1.23      mycroft   392:        if (kt->kt_tag == KTT_DEVICE) {
                    393:                dev_t *dp = kt->kt_data;
1.24      mycroft   394:        loop:
1.57      fvdl      395:                if (*dp == NODEV || !vfinddev(*dp, kt->kt_vtype, &fvp)) {
1.24      mycroft   396:                        return (ENOENT);
1.57      fvdl      397:                }
1.23      mycroft   398:                *vpp = fvp;
1.57      fvdl      399:                if (vget(fvp, LK_EXCLUSIVE))
1.24      mycroft   400:                        goto loop;
1.64      wrstuden  401:                if (wantpunlock) {
                    402:                        VOP_UNLOCK(dvp, 0);
                    403:                        cnp->cn_flags |= PDIRUNLOCK;
                    404:                }
1.23      mycroft   405:                return (0);
                    406:        }
1.1       cgd       407:
                    408: #ifdef KERNFS_DIAGNOSTIC
1.47      christos  409:        printf("kernfs_lookup: allocate new vnode\n");
1.1       cgd       410: #endif
1.41      christos  411:        error = getnewvnode(VT_KERNFS, dvp->v_mount, kernfs_vnodeop_p, &fvp);
1.57      fvdl      412:        if (error) {
1.23      mycroft   413:                return (error);
1.57      fvdl      414:        }
1.23      mycroft   415:
                    416:        MALLOC(fvp->v_data, void *, sizeof(struct kernfs_node), M_TEMP,
                    417:            M_WAITOK);
                    418:        VTOKERN(fvp)->kf_kt = kt;
                    419:        fvp->v_type = kt->kt_vtype;
1.64      wrstuden  420:        vn_lock(fvp, LK_EXCLUSIVE | LK_RETRY);
1.23      mycroft   421:        *vpp = fvp;
                    422:
1.1       cgd       423: #ifdef KERNFS_DIAGNOSTIC
1.51      christos  424:        printf("kernfs_lookup: newvp = %p\n", fvp);
1.1       cgd       425: #endif
1.64      wrstuden  426:        if (wantpunlock) {
                    427:                VOP_UNLOCK(dvp, 0);
                    428:                cnp->cn_flags |= PDIRUNLOCK;
                    429:        }
1.1       cgd       430:        return (0);
                    431: }
                    432:
1.28      mycroft   433: int
1.41      christos  434: kernfs_access(v)
                    435:        void *v;
                    436: {
1.23      mycroft   437:        struct vop_access_args /* {
                    438:                struct vnode *a_vp;
1.34      mycroft   439:                int a_mode;
1.23      mycroft   440:                struct ucred *a_cred;
                    441:                struct proc *a_p;
1.41      christos  442:        } */ *ap = v;
1.26      mycroft   443:        struct vnode *vp = ap->a_vp;
1.49      mycroft   444:        mode_t mode;
1.17      cgd       445:
1.49      mycroft   446:        if (vp->v_flag & VROOT) {
                    447:                mode = DIR_MODE;
                    448:        } else {
1.75      jdolecek  449:                const struct kern_target *kt = VTOKERN(vp)->kf_kt;
1.49      mycroft   450:                mode = kt->kt_mode;
                    451:        }
                    452:
                    453:        return (vaccess(vp->v_type, mode, (uid_t)0, (gid_t)0, ap->a_mode,
                    454:            ap->a_cred));
1.23      mycroft   455: }
                    456:
1.41      christos  457: int
                    458: kernfs_getattr(v)
                    459:        void *v;
                    460: {
1.23      mycroft   461:        struct vop_getattr_args /* {
                    462:                struct vnode *a_vp;
                    463:                struct vattr *a_vap;
                    464:                struct ucred *a_cred;
                    465:                struct proc *a_p;
1.41      christos  466:        } */ *ap = v;
1.23      mycroft   467:        struct vnode *vp = ap->a_vp;
                    468:        struct vattr *vap = ap->a_vap;
1.1       cgd       469:        int error = 0;
1.28      mycroft   470:        char strbuf[KSTRING], *buf;
1.1       cgd       471:
1.60      perry     472:        memset((caddr_t) vap, 0, sizeof(*vap));
1.1       cgd       473:        vattr_null(vap);
1.17      cgd       474:        vap->va_uid = 0;
                    475:        vap->va_gid = 0;
1.1       cgd       476:        vap->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0];
1.23      mycroft   477:        vap->va_size = 0;
1.1       cgd       478:        vap->va_blocksize = DEV_BSIZE;
1.81      lukem     479:        /*
1.83      simonb    480:         * Make all times be current TOD.  Avoid microtime(9), it's slow.
                    481:         * We don't guard the read from time(9) with splclock(9) since we
                    482:         * don't actually need to be THAT sure the access is atomic.
1.81      lukem     483:         */
1.83      simonb    484:        TIMEVAL_TO_TIMESPEC(&time, &vap->va_ctime);
1.81      lukem     485:        vap->va_atime = vap->va_mtime = vap->va_ctime;
1.1       cgd       486:        vap->va_gen = 0;
                    487:        vap->va_flags = 0;
                    488:        vap->va_rdev = 0;
                    489:        vap->va_bytes = 0;
                    490:
                    491:        if (vp->v_flag & VROOT) {
                    492: #ifdef KERNFS_DIAGNOSTIC
1.47      christos  493:                printf("kernfs_getattr: stat rootdir\n");
1.1       cgd       494: #endif
1.17      cgd       495:                vap->va_type = VDIR;
1.23      mycroft   496:                vap->va_mode = DIR_MODE;
1.1       cgd       497:                vap->va_nlink = 2;
                    498:                vap->va_fileid = 2;
                    499:                vap->va_size = DEV_BSIZE;
                    500:        } else {
1.75      jdolecek  501:                const struct kern_target *kt = VTOKERN(vp)->kf_kt;
1.84      jdolecek  502:                size_t nread, total;
1.1       cgd       503: #ifdef KERNFS_DIAGNOSTIC
1.47      christos  504:                printf("kernfs_getattr: stat target %s\n", kt->kt_name);
1.1       cgd       505: #endif
1.17      cgd       506:                vap->va_type = kt->kt_vtype;
1.23      mycroft   507:                vap->va_mode = kt->kt_mode;
1.1       cgd       508:                vap->va_nlink = 1;
1.57      fvdl      509:                vap->va_fileid = 1 + (kt - kern_targets);
1.84      jdolecek  510:                total = 0;
                    511:                do {
                    512:                        buf = strbuf;
                    513:                        error = kernfs_xread(kt, total, &buf,
                    514:                                sizeof(strbuf), &nread);
                    515:                        total += nread;
                    516:                } while (error == 0 && nread != 0);
                    517:                vap->va_size = total;
1.1       cgd       518:        }
                    519:
                    520: #ifdef KERNFS_DIAGNOSTIC
1.47      christos  521:        printf("kernfs_getattr: return error %d\n", error);
1.1       cgd       522: #endif
                    523:        return (error);
                    524: }
                    525:
1.41      christos  526: /*ARGSUSED*/
                    527: int
                    528: kernfs_setattr(v)
                    529:        void *v;
1.1       cgd       530: {
                    531:        /*
1.17      cgd       532:         * Silently ignore attribute changes.
                    533:         * This allows for open with truncate to have no
                    534:         * effect until some data is written.  I want to
                    535:         * do it this way because all writes are atomic.
1.1       cgd       536:         */
1.17      cgd       537:        return (0);
1.1       cgd       538: }
                    539:
1.28      mycroft   540: int
1.41      christos  541: kernfs_read(v)
                    542:        void *v;
                    543: {
1.23      mycroft   544:        struct vop_read_args /* {
                    545:                struct vnode *a_vp;
                    546:                struct uio *a_uio;
                    547:                int  a_ioflag;
                    548:                struct ucred *a_cred;
1.41      christos  549:        } */ *ap = v;
1.23      mycroft   550:        struct vnode *vp = ap->a_vp;
                    551:        struct uio *uio = ap->a_uio;
1.75      jdolecek  552:        const struct kern_target *kt;
1.28      mycroft   553:        char strbuf[KSTRING], *buf;
1.82      jdolecek  554:        off_t off;
                    555:        size_t len;
1.28      mycroft   556:        int error;
1.23      mycroft   557:
                    558:        if (vp->v_type == VDIR)
                    559:                return (EOPNOTSUPP);
                    560:
                    561:        kt = VTOKERN(vp)->kf_kt;
                    562:
1.1       cgd       563: #ifdef KERNFS_DIAGNOSTIC
1.47      christos  564:        printf("kern_read %s\n", kt->kt_name);
1.1       cgd       565: #endif
1.18      cgd       566:
1.28      mycroft   567:        off = uio->uio_offset;
1.82      jdolecek  568:        buf = strbuf;
                    569:        if ((error = kernfs_xread(kt, off, &buf, sizeof(strbuf), &len)) == 0)
                    570:                error = uiomove(buf, len, uio);
                    571:        return (error);
1.1       cgd       572: }
                    573:
1.28      mycroft   574: int
1.41      christos  575: kernfs_write(v)
                    576:        void *v;
                    577: {
1.23      mycroft   578:        struct vop_write_args /* {
                    579:                struct vnode *a_vp;
                    580:                struct uio *a_uio;
                    581:                int  a_ioflag;
                    582:                struct ucred *a_cred;
1.41      christos  583:        } */ *ap = v;
1.23      mycroft   584:        struct vnode *vp = ap->a_vp;
                    585:        struct uio *uio = ap->a_uio;
1.75      jdolecek  586:        const struct kern_target *kt;
1.23      mycroft   587:        int error, xlen;
1.1       cgd       588:        char strbuf[KSTRING];
1.23      mycroft   589:
                    590:        if (vp->v_type == VDIR)
                    591:                return (EOPNOTSUPP);
                    592:
                    593:        kt = VTOKERN(vp)->kf_kt;
1.1       cgd       594:
                    595:        if (uio->uio_offset != 0)
                    596:                return (EINVAL);
                    597:
                    598:        xlen = min(uio->uio_resid, KSTRING-1);
1.41      christos  599:        if ((error = uiomove(strbuf, xlen, uio)) != 0)
1.1       cgd       600:                return (error);
                    601:
                    602:        if (uio->uio_resid != 0)
                    603:                return (EIO);
                    604:
                    605:        strbuf[xlen] = '\0';
1.17      cgd       606:        xlen = strlen(strbuf);
1.1       cgd       607:        return (kernfs_xwrite(kt, strbuf, xlen));
                    608: }
                    609:
1.41      christos  610: int
                    611: kernfs_readdir(v)
                    612:        void *v;
                    613: {
1.23      mycroft   614:        struct vop_readdir_args /* {
                    615:                struct vnode *a_vp;
                    616:                struct uio *a_uio;
                    617:                struct ucred *a_cred;
1.26      mycroft   618:                int *a_eofflag;
1.57      fvdl      619:                off_t **a_cookies;
                    620:                int a_*ncookies;
1.41      christos  621:        } */ *ap = v;
1.23      mycroft   622:        struct uio *uio = ap->a_uio;
1.37      mycroft   623:        struct dirent d;
1.75      jdolecek  624:        const struct kern_target *kt;
1.67      sommerfe  625:        off_t i;
1.1       cgd       626:        int error;
1.57      fvdl      627:        off_t *cookies = NULL;
                    628:        int ncookies = 0, nc = 0;
1.1       cgd       629:
1.23      mycroft   630:        if (ap->a_vp->v_type != VDIR)
                    631:                return (ENOTDIR);
                    632:
1.37      mycroft   633:        if (uio->uio_resid < UIO_MX)
                    634:                return (EINVAL);
1.38      mycroft   635:        if (uio->uio_offset < 0)
1.37      mycroft   636:                return (EINVAL);
1.26      mycroft   637:
1.1       cgd       638:        error = 0;
1.38      mycroft   639:        i = uio->uio_offset;
1.66      sommerfe  640:
                    641:        if (i >= nkern_targets)
                    642:                return 0;
                    643:
1.60      perry     644:        memset((caddr_t)&d, 0, UIO_MX);
1.37      mycroft   645:        d.d_reclen = UIO_MX;
                    646:
1.57      fvdl      647:        if (ap->a_ncookies) {
                    648:                nc = uio->uio_resid / UIO_MX;
                    649:                nc = min(nc, (nkern_targets - i));
1.70      thorpej   650:                cookies = malloc(nc * sizeof(off_t), M_TEMP, M_WAITOK);
1.57      fvdl      651:                *ap->a_cookies = cookies;
                    652:        }
                    653:
1.23      mycroft   654:        for (kt = &kern_targets[i];
                    655:             uio->uio_resid >= UIO_MX && i < nkern_targets; kt++, i++) {
1.1       cgd       656: #ifdef KERNFS_DIAGNOSTIC
1.74      mrg       657:                printf("kernfs_readdir: i = %d\n", (int)i);
1.1       cgd       658: #endif
1.26      mycroft   659:
1.23      mycroft   660:                if (kt->kt_tag == KTT_DEVICE) {
1.26      mycroft   661:                        dev_t *dp = kt->kt_data;
1.23      mycroft   662:                        struct vnode *fvp;
1.26      mycroft   663:
1.23      mycroft   664:                        if (*dp == NODEV || !vfinddev(*dp, kt->kt_vtype, &fvp))
                    665:                                continue;
                    666:                }
1.26      mycroft   667:
1.37      mycroft   668:                d.d_fileno = i + 3;
                    669:                d.d_namlen = kt->kt_namlen;
1.60      perry     670:                memcpy(d.d_name, kt->kt_name, kt->kt_namlen + 1);
1.37      mycroft   671:                d.d_type = kt->kt_type;
1.26      mycroft   672:
1.41      christos  673:                if ((error = uiomove((caddr_t)&d, UIO_MX, uio)) != 0)
1.1       cgd       674:                        break;
1.57      fvdl      675:                if (cookies) {
1.38      mycroft   676:                        *cookies++ = i + 1;
1.57      fvdl      677:                        ncookies++;
                    678:                }
                    679:        }
                    680:
                    681:        if (ap->a_ncookies) {
                    682:                if (error) {
1.70      thorpej   683:                        free(*ap->a_cookies, M_TEMP);
1.57      fvdl      684:                        *ap->a_ncookies = 0;
                    685:                        *ap->a_cookies = NULL;
                    686:                } else
                    687:                        *ap->a_ncookies = ncookies;
1.1       cgd       688:        }
                    689:
1.38      mycroft   690:        uio->uio_offset = i;
1.1       cgd       691:        return (error);
                    692: }
                    693:
1.41      christos  694: int
                    695: kernfs_inactive(v)
                    696:        void *v;
                    697: {
1.23      mycroft   698:        struct vop_inactive_args /* {
                    699:                struct vnode *a_vp;
1.57      fvdl      700:                struct proc *a_p;
1.41      christos  701:        } */ *ap = v;
1.23      mycroft   702:        struct vnode *vp = ap->a_vp;
                    703:
                    704: #ifdef KERNFS_DIAGNOSTIC
1.51      christos  705:        printf("kernfs_inactive(%p)\n", vp);
1.23      mycroft   706: #endif
1.1       cgd       707:        /*
                    708:         * Clear out the v_type field to avoid
                    709:         * nasty things happening in vgone().
                    710:         */
1.57      fvdl      711:        VOP_UNLOCK(vp, 0);
1.1       cgd       712:        vp->v_type = VNON;
1.23      mycroft   713:        return (0);
                    714: }
                    715:
1.41      christos  716: int
                    717: kernfs_reclaim(v)
                    718:        void *v;
                    719: {
1.23      mycroft   720:        struct vop_reclaim_args /* {
                    721:                struct vnode *a_vp;
1.41      christos  722:        } */ *ap = v;
1.23      mycroft   723:        struct vnode *vp = ap->a_vp;
                    724:
1.1       cgd       725: #ifdef KERNFS_DIAGNOSTIC
1.51      christos  726:        printf("kernfs_reclaim(%p)\n", vp);
1.1       cgd       727: #endif
1.23      mycroft   728:        if (vp->v_data) {
                    729:                FREE(vp->v_data, M_TEMP);
                    730:                vp->v_data = 0;
                    731:        }
1.1       cgd       732:        return (0);
                    733: }
                    734:
                    735: /*
1.23      mycroft   736:  * Return POSIX pathconf information applicable to special devices.
                    737:  */
1.41      christos  738: int
                    739: kernfs_pathconf(v)
                    740:        void *v;
                    741: {
1.23      mycroft   742:        struct vop_pathconf_args /* {
                    743:                struct vnode *a_vp;
                    744:                int a_name;
1.29      cgd       745:                register_t *a_retval;
1.41      christos  746:        } */ *ap = v;
1.23      mycroft   747:
                    748:        switch (ap->a_name) {
                    749:        case _PC_LINK_MAX:
                    750:                *ap->a_retval = LINK_MAX;
                    751:                return (0);
                    752:        case _PC_MAX_CANON:
                    753:                *ap->a_retval = MAX_CANON;
                    754:                return (0);
                    755:        case _PC_MAX_INPUT:
                    756:                *ap->a_retval = MAX_INPUT;
                    757:                return (0);
                    758:        case _PC_PIPE_BUF:
                    759:                *ap->a_retval = PIPE_BUF;
                    760:                return (0);
                    761:        case _PC_CHOWN_RESTRICTED:
                    762:                *ap->a_retval = 1;
                    763:                return (0);
                    764:        case _PC_VDISABLE:
                    765:                *ap->a_retval = _POSIX_VDISABLE;
1.59      kleink    766:                return (0);
                    767:        case _PC_SYNC_IO:
                    768:                *ap->a_retval = 1;
1.23      mycroft   769:                return (0);
                    770:        default:
                    771:                return (EINVAL);
                    772:        }
                    773:        /* NOTREACHED */
                    774: }
                    775:
                    776: /*
                    777:  * Print out the contents of a /dev/fd vnode.
1.1       cgd       778:  */
                    779: /* ARGSUSED */
1.41      christos  780: int
                    781: kernfs_print(v)
                    782:        void *v;
1.23      mycroft   783: {
                    784:
1.47      christos  785:        printf("tag VT_KERNFS, kernfs vnode\n");
1.23      mycroft   786:        return (0);
                    787: }
                    788:
1.40      mycroft   789: int
1.41      christos  790: kernfs_link(v)
                    791:        void *v;
                    792: {
1.40      mycroft   793:        struct vop_link_args /* {
                    794:                struct vnode *a_dvp;
                    795:                struct vnode *a_vp;
                    796:                struct componentname *a_cnp;
1.41      christos  797:        } */ *ap = v;
1.40      mycroft   798:
                    799:        VOP_ABORTOP(ap->a_dvp, ap->a_cnp);
                    800:        vput(ap->a_dvp);
                    801:        return (EROFS);
                    802: }
                    803:
                    804: int
1.41      christos  805: kernfs_symlink(v)
                    806:        void *v;
                    807: {
1.40      mycroft   808:        struct vop_symlink_args /* {
                    809:                struct vnode *a_dvp;
                    810:                struct vnode **a_vpp;
                    811:                struct componentname *a_cnp;
                    812:                struct vattr *a_vap;
                    813:                char *a_target;
1.41      christos  814:        } */ *ap = v;
1.40      mycroft   815:
                    816:        VOP_ABORTOP(ap->a_dvp, ap->a_cnp);
                    817:        vput(ap->a_dvp);
                    818:        return (EROFS);
1.1       cgd       819: }

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