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Annotation of Net2/miscfs/deadfs/dead_vnops.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1989 The Regents of the University of California.
        !             3:  * All rights reserved.
        !             4:  *
        !             5:  * Redistribution and use in source and binary forms, with or without
        !             6:  * modification, are permitted provided that the following conditions
        !             7:  * are met:
        !             8:  * 1. Redistributions of source code must retain the above copyright
        !             9:  *    notice, this list of conditions and the following disclaimer.
        !            10:  * 2. Redistributions in binary form must reproduce the above copyright
        !            11:  *    notice, this list of conditions and the following disclaimer in the
        !            12:  *    documentation and/or other materials provided with the distribution.
        !            13:  * 3. All advertising materials mentioning features or use of this software
        !            14:  *    must display the following acknowledgement:
        !            15:  *     This product includes software developed by the University of
        !            16:  *     California, Berkeley and its contributors.
        !            17:  * 4. Neither the name of the University nor the names of its contributors
        !            18:  *    may be used to endorse or promote products derived from this software
        !            19:  *    without specific prior written permission.
        !            20:  *
        !            21:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            22:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            23:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            24:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            25:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            26:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            27:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            28:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            29:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            30:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            31:  * SUCH DAMAGE.
        !            32:  *
        !            33:  *     @(#)dead_vnops.c        7.13 (Berkeley) 4/15/91
        !            34:  */
        !            35: 
        !            36: #include "param.h"
        !            37: #include "systm.h"
        !            38: #include "time.h"
        !            39: #include "vnode.h"
        !            40: #include "errno.h"
        !            41: #include "namei.h"
        !            42: #include "buf.h"
        !            43: 
        !            44: /*
        !            45:  * Prototypes for dead operations on vnodes.
        !            46:  */
        !            47: int    dead_badop(),
        !            48:        dead_ebadf();
        !            49: int    dead_lookup __P((
        !            50:                struct vnode *vp,
        !            51:                struct nameidata *ndp,
        !            52:                struct proc *p));
        !            53: #define dead_create ((int (*) __P(( \
        !            54:                struct nameidata *ndp, \
        !            55:                struct vattr *vap, \
        !            56:                struct proc *p))) dead_badop)
        !            57: #define dead_mknod ((int (*) __P(( \
        !            58:                struct nameidata *ndp, \
        !            59:                struct vattr *vap, \
        !            60:                struct ucred *cred, \
        !            61:                struct proc *p))) dead_badop)
        !            62: int    dead_open __P((
        !            63:                struct vnode *vp,
        !            64:                int mode,
        !            65:                struct ucred *cred,
        !            66:                struct proc *p));
        !            67: #define dead_close ((int (*) __P(( \
        !            68:                struct vnode *vp, \
        !            69:                int fflag, \
        !            70:                struct ucred *cred, \
        !            71:                struct proc *p))) nullop)
        !            72: #define dead_access ((int (*) __P(( \
        !            73:                struct vnode *vp, \
        !            74:                int mode, \
        !            75:                struct ucred *cred, \
        !            76:                struct proc *p))) dead_ebadf)
        !            77: #define dead_getattr ((int (*) __P(( \
        !            78:                struct vnode *vp, \
        !            79:                struct vattr *vap, \
        !            80:                struct ucred *cred, \
        !            81:                struct proc *p))) dead_ebadf)
        !            82: #define dead_setattr ((int (*) __P(( \
        !            83:                struct vnode *vp, \
        !            84:                struct vattr *vap, \
        !            85:                struct ucred *cred, \
        !            86:                struct proc *p))) dead_ebadf)
        !            87: int    dead_read __P((
        !            88:                struct vnode *vp,
        !            89:                struct uio *uio,
        !            90:                int ioflag,
        !            91:                struct ucred *cred));
        !            92: int    dead_write __P((
        !            93:                struct vnode *vp,
        !            94:                struct uio *uio,
        !            95:                int ioflag,
        !            96:                struct ucred *cred));
        !            97: int    dead_ioctl __P((
        !            98:                struct vnode *vp,
        !            99:                int command,
        !           100:                caddr_t data,
        !           101:                int fflag,
        !           102:                struct ucred *cred,
        !           103:                struct proc *p));
        !           104: int    dead_select __P((
        !           105:                struct vnode *vp,
        !           106:                int which,
        !           107:                int fflags,
        !           108:                struct ucred *cred,
        !           109:                struct proc *p));
        !           110: #define dead_mmap ((int (*) __P(( \
        !           111:                struct vnode *vp, \
        !           112:                int fflags, \
        !           113:                struct ucred *cred, \
        !           114:                struct proc *p))) dead_badop)
        !           115: #define dead_fsync ((int (*) __P(( \
        !           116:                struct vnode *vp, \
        !           117:                int fflags, \
        !           118:                struct ucred *cred, \
        !           119:                int waitfor, \
        !           120:                struct proc *p))) nullop)
        !           121: #define dead_seek ((int (*) __P(( \
        !           122:                struct vnode *vp, \
        !           123:                off_t oldoff, \
        !           124:                off_t newoff, \
        !           125:                struct ucred *cred))) nullop)
        !           126: #define dead_remove ((int (*) __P(( \
        !           127:                struct nameidata *ndp, \
        !           128:                struct proc *p))) dead_badop)
        !           129: #define dead_link ((int (*) __P(( \
        !           130:                struct vnode *vp, \
        !           131:                struct nameidata *ndp, \
        !           132:                struct proc *p))) dead_badop)
        !           133: #define dead_rename ((int (*) __P(( \
        !           134:                struct nameidata *fndp, \
        !           135:                struct nameidata *tdnp, \
        !           136:                struct proc *p))) dead_badop)
        !           137: #define dead_mkdir ((int (*) __P(( \
        !           138:                struct nameidata *ndp, \
        !           139:                struct vattr *vap, \
        !           140:                struct proc *p))) dead_badop)
        !           141: #define dead_rmdir ((int (*) __P(( \
        !           142:                struct nameidata *ndp, \
        !           143:                struct proc *p))) dead_badop)
        !           144: #define dead_symlink ((int (*) __P(( \
        !           145:                struct nameidata *ndp, \
        !           146:                struct vattr *vap, \
        !           147:                char *target, \
        !           148:                struct proc *p))) dead_badop)
        !           149: #define dead_readdir ((int (*) __P(( \
        !           150:                struct vnode *vp, \
        !           151:                struct uio *uio, \
        !           152:                struct ucred *cred, \
        !           153:                int *eofflagp))) dead_ebadf)
        !           154: #define dead_readlink ((int (*) __P(( \
        !           155:                struct vnode *vp, \
        !           156:                struct uio *uio, \
        !           157:                struct ucred *cred))) dead_ebadf)
        !           158: #define dead_abortop ((int (*) __P(( \
        !           159:                struct nameidata *ndp))) dead_badop)
        !           160: #define dead_inactive ((int (*) __P(( \
        !           161:                struct vnode *vp, \
        !           162:                struct proc *p))) nullop)
        !           163: #define dead_reclaim ((int (*) __P(( \
        !           164:                struct vnode *vp))) nullop)
        !           165: int    dead_lock __P((
        !           166:                struct vnode *vp));
        !           167: #define dead_unlock ((int (*) __P(( \
        !           168:                struct vnode *vp))) nullop)
        !           169: int    dead_bmap __P((
        !           170:                struct vnode *vp,
        !           171:                daddr_t bn,
        !           172:                struct vnode **vpp,
        !           173:                daddr_t *bnp));
        !           174: int    dead_strategy __P((
        !           175:                struct buf *bp));
        !           176: int    dead_print __P((
        !           177:                struct vnode *vp));
        !           178: #define dead_islocked ((int (*) __P(( \
        !           179:                struct vnode *vp))) nullop)
        !           180: #define dead_advlock ((int (*) __P(( \
        !           181:                struct vnode *vp, \
        !           182:                caddr_t id, \
        !           183:                int op, \
        !           184:                struct flock *fl, \
        !           185:                int flags))) dead_ebadf)
        !           186: 
        !           187: struct vnodeops dead_vnodeops = {
        !           188:        dead_lookup,    /* lookup */
        !           189:        dead_create,    /* create */
        !           190:        dead_mknod,     /* mknod */
        !           191:        dead_open,      /* open */
        !           192:        dead_close,     /* close */
        !           193:        dead_access,    /* access */
        !           194:        dead_getattr,   /* getattr */
        !           195:        dead_setattr,   /* setattr */
        !           196:        dead_read,      /* read */
        !           197:        dead_write,     /* write */
        !           198:        dead_ioctl,     /* ioctl */
        !           199:        dead_select,    /* select */
        !           200:        dead_mmap,      /* mmap */
        !           201:        dead_fsync,     /* fsync */
        !           202:        dead_seek,      /* seek */
        !           203:        dead_remove,    /* remove */
        !           204:        dead_link,      /* link */
        !           205:        dead_rename,    /* rename */
        !           206:        dead_mkdir,     /* mkdir */
        !           207:        dead_rmdir,     /* rmdir */
        !           208:        dead_symlink,   /* symlink */
        !           209:        dead_readdir,   /* readdir */
        !           210:        dead_readlink,  /* readlink */
        !           211:        dead_abortop,   /* abortop */
        !           212:        dead_inactive,  /* inactive */
        !           213:        dead_reclaim,   /* reclaim */
        !           214:        dead_lock,      /* lock */
        !           215:        dead_unlock,    /* unlock */
        !           216:        dead_bmap,      /* bmap */
        !           217:        dead_strategy,  /* strategy */
        !           218:        dead_print,     /* print */
        !           219:        dead_islocked,  /* islocked */
        !           220:        dead_advlock,   /* advlock */
        !           221: };
        !           222: 
        !           223: /*
        !           224:  * Trivial lookup routine that always fails.
        !           225:  */
        !           226: /* ARGSUSED */
        !           227: dead_lookup(vp, ndp, p)
        !           228:        struct vnode *vp;
        !           229:        struct nameidata *ndp;
        !           230:        struct proc *p;
        !           231: {
        !           232: 
        !           233:        ndp->ni_dvp = vp;
        !           234:        ndp->ni_vp = NULL;
        !           235:        return (ENOTDIR);
        !           236: }
        !           237: 
        !           238: /*
        !           239:  * Open always fails as if device did not exist.
        !           240:  */
        !           241: /* ARGSUSED */
        !           242: dead_open(vp, mode, cred, p)
        !           243:        struct vnode *vp;
        !           244:        int mode;
        !           245:        struct ucred *cred;
        !           246:        struct proc *p;
        !           247: {
        !           248: 
        !           249:        return (ENXIO);
        !           250: }
        !           251: 
        !           252: /*
        !           253:  * Vnode op for read
        !           254:  */
        !           255: /* ARGSUSED */
        !           256: dead_read(vp, uio, ioflag, cred)
        !           257:        struct vnode *vp;
        !           258:        struct uio *uio;
        !           259:        int ioflag;
        !           260:        struct ucred *cred;
        !           261: {
        !           262: 
        !           263:        if (chkvnlock(vp))
        !           264:                panic("dead_read: lock");
        !           265:        /*
        !           266:         * Return EOF for character devices, EIO for others
        !           267:         */
        !           268:        if (vp->v_type != VCHR)
        !           269:                return (EIO);
        !           270:        return (0);
        !           271: }
        !           272: 
        !           273: /*
        !           274:  * Vnode op for write
        !           275:  */
        !           276: /* ARGSUSED */
        !           277: dead_write(vp, uio, ioflag, cred)
        !           278:        register struct vnode *vp;
        !           279:        struct uio *uio;
        !           280:        int ioflag;
        !           281:        struct ucred *cred;
        !           282: {
        !           283: 
        !           284:        if (chkvnlock(vp))
        !           285:                panic("dead_write: lock");
        !           286:        return (EIO);
        !           287: }
        !           288: 
        !           289: /*
        !           290:  * Device ioctl operation.
        !           291:  */
        !           292: /* ARGSUSED */
        !           293: dead_ioctl(vp, com, data, fflag, cred, p)
        !           294:        struct vnode *vp;
        !           295:        register int com;
        !           296:        caddr_t data;
        !           297:        int fflag;
        !           298:        struct ucred *cred;
        !           299:        struct proc *p;
        !           300: {
        !           301: 
        !           302:        if (!chkvnlock(vp))
        !           303:                return (EBADF);
        !           304:        return (VOP_IOCTL(vp, com, data, fflag, cred, p));
        !           305: }
        !           306: 
        !           307: /* ARGSUSED */
        !           308: dead_select(vp, which, fflags, cred, p)
        !           309:        struct vnode *vp;
        !           310:        int which, fflags;
        !           311:        struct ucred *cred;
        !           312:        struct proc *p;
        !           313: {
        !           314: 
        !           315:        /*
        !           316:         * Let the user find out that the descriptor is gone.
        !           317:         */
        !           318:        return (1);
        !           319: }
        !           320: 
        !           321: /*
        !           322:  * Just call the device strategy routine
        !           323:  */
        !           324: dead_strategy(bp)
        !           325:        register struct buf *bp;
        !           326: {
        !           327: 
        !           328:        if (bp->b_vp == NULL || !chkvnlock(bp->b_vp)) {
        !           329:                bp->b_flags |= B_ERROR;
        !           330:                biodone(bp);
        !           331:                return (EIO);
        !           332:        }
        !           333:        return (VOP_STRATEGY(bp));
        !           334: }
        !           335: 
        !           336: /*
        !           337:  * Wait until the vnode has finished changing state.
        !           338:  */
        !           339: dead_lock(vp)
        !           340:        struct vnode *vp;
        !           341: {
        !           342: 
        !           343:        if (!chkvnlock(vp))
        !           344:                return (0);
        !           345:        return (VOP_LOCK(vp));
        !           346: }
        !           347: 
        !           348: /*
        !           349:  * Wait until the vnode has finished changing state.
        !           350:  */
        !           351: dead_bmap(vp, bn, vpp, bnp)
        !           352:        struct vnode *vp;
        !           353:        daddr_t bn;
        !           354:        struct vnode **vpp;
        !           355:        daddr_t *bnp;
        !           356: {
        !           357: 
        !           358:        if (!chkvnlock(vp))
        !           359:                return (EIO);
        !           360:        return (VOP_BMAP(vp, bn, vpp, bnp));
        !           361: }
        !           362: 
        !           363: /*
        !           364:  * Print out the contents of a dead vnode.
        !           365:  */
        !           366: /* ARGSUSED */
        !           367: dead_print(vp)
        !           368:        struct vnode *vp;
        !           369: {
        !           370: 
        !           371:        printf("tag VT_NON, dead vnode\n");
        !           372: }
        !           373: 
        !           374: /*
        !           375:  * Empty vnode failed operation
        !           376:  */
        !           377: dead_ebadf()
        !           378: {
        !           379: 
        !           380:        return (EBADF);
        !           381: }
        !           382: 
        !           383: /*
        !           384:  * Empty vnode bad operation
        !           385:  */
        !           386: dead_badop()
        !           387: {
        !           388: 
        !           389:        panic("dead_badop called");
        !           390:        /* NOTREACHED */
        !           391: }
        !           392: 
        !           393: /*
        !           394:  * Empty vnode null operation
        !           395:  */
        !           396: dead_nullop()
        !           397: {
        !           398: 
        !           399:        return (0);
        !           400: }
        !           401: 
        !           402: /*
        !           403:  * We have to wait during times when the vnode is
        !           404:  * in a state of change.
        !           405:  */
        !           406: chkvnlock(vp)
        !           407:        register struct vnode *vp;
        !           408: {
        !           409:        int locked = 0;
        !           410: 
        !           411:        while (vp->v_flag & VXLOCK) {
        !           412:                vp->v_flag |= VXWANT;
        !           413:                sleep((caddr_t)vp, PINOD);
        !           414:                locked = 1;
        !           415:        }
        !           416:        return (locked);
        !           417: }

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