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Annotation of 43BSDReno/sys/kern/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 is only permitted until one year after the first shipment
        !             6:  * of 4.4BSD by the Regents.  Otherwise, redistribution and use in source and
        !             7:  * binary forms are permitted provided that: (1) source distributions retain
        !             8:  * this entire copyright notice and comment, and (2) distributions including
        !             9:  * binaries display the following acknowledgement:  This product includes
        !            10:  * software developed by the University of California, Berkeley and its
        !            11:  * contributors'' in the documentation or other materials provided with the
        !            12:  * distribution and in all advertising materials mentioning features or use
        !            13:  * of this software.  Neither the name of the University nor the names of
        !            14:  * its contributors may be used to endorse or promote products derived from
        !            15:  * this software without specific prior written permission.
        !            16:  * THIS SOFTWARE IS PROVIDED AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
        !            17:  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
        !            18:  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            19:  *
        !            20:  *     @(#)dead_vnops.c        7.10 (Berkeley) 6/28/90
        !            21:  */
        !            22: 
        !            23: #include "param.h"
        !            24: #include "time.h"
        !            25: #include "vnode.h"
        !            26: #include "errno.h"
        !            27: #include "namei.h"
        !            28: #include "buf.h"
        !            29: 
        !            30: int    dead_lookup(),
        !            31:        dead_open(),
        !            32:        dead_read(),
        !            33:        dead_write(),
        !            34:        dead_strategy(),
        !            35:        dead_ioctl(),
        !            36:        dead_select(),
        !            37:        dead_lock(),
        !            38:        dead_bmap(),
        !            39:        dead_print(),
        !            40:        dead_ebadf(),
        !            41:        dead_badop(),
        !            42:        dead_nullop();
        !            43: 
        !            44: struct vnodeops dead_vnodeops = {
        !            45:        dead_lookup,    /* lookup */
        !            46:        dead_badop,     /* create */
        !            47:        dead_badop,     /* mknod */
        !            48:        dead_open,      /* open */
        !            49:        dead_nullop,    /* close */
        !            50:        dead_ebadf,     /* access */
        !            51:        dead_ebadf,     /* getattr */
        !            52:        dead_ebadf,     /* setattr */
        !            53:        dead_read,      /* read */
        !            54:        dead_write,     /* write */
        !            55:        dead_ioctl,     /* ioctl */
        !            56:        dead_select,    /* select */
        !            57:        dead_badop,     /* mmap */
        !            58:        dead_nullop,    /* fsync */
        !            59:        dead_nullop,    /* seek */
        !            60:        dead_badop,     /* remove */
        !            61:        dead_badop,     /* link */
        !            62:        dead_badop,     /* rename */
        !            63:        dead_badop,     /* mkdir */
        !            64:        dead_badop,     /* rmdir */
        !            65:        dead_badop,     /* symlink */
        !            66:        dead_ebadf,     /* readdir */
        !            67:        dead_ebadf,     /* readlink */
        !            68:        dead_badop,     /* abortop */
        !            69:        dead_nullop,    /* inactive */
        !            70:        dead_nullop,    /* reclaim */
        !            71:        dead_lock,      /* lock */
        !            72:        dead_nullop,    /* unlock */
        !            73:        dead_bmap,      /* bmap */
        !            74:        dead_strategy,  /* strategy */
        !            75:        dead_print,     /* print */
        !            76:        dead_nullop,    /* islocked */
        !            77: };
        !            78: 
        !            79: /*
        !            80:  * Trivial lookup routine that always fails.
        !            81:  */
        !            82: dead_lookup(vp, ndp)
        !            83:        struct vnode *vp;
        !            84:        struct nameidata *ndp;
        !            85: {
        !            86: 
        !            87:        ndp->ni_dvp = vp;
        !            88:        ndp->ni_vp = NULL;
        !            89:        return (ENOTDIR);
        !            90: }
        !            91: 
        !            92: /*
        !            93:  * Open always fails as if device did not exist.
        !            94:  */
        !            95: /* ARGSUSED */
        !            96: dead_open(vp, mode, cred)
        !            97:        struct vnode *vp;
        !            98:        int mode;
        !            99:        struct ucred *cred;
        !           100: {
        !           101: 
        !           102:        return (ENXIO);
        !           103: }
        !           104: 
        !           105: /*
        !           106:  * Vnode op for read
        !           107:  */
        !           108: /* ARGSUSED */
        !           109: dead_read(vp, uio, ioflag, cred)
        !           110:        struct vnode *vp;
        !           111:        struct uio *uio;
        !           112:        int ioflag;
        !           113:        struct ucred *cred;
        !           114: {
        !           115: 
        !           116:        if (chkvnlock(vp))
        !           117:                panic("dead_read: lock");
        !           118:        /*
        !           119:         * Return EOF for character devices, EIO for others
        !           120:         */
        !           121:        if (vp->v_type != VCHR)
        !           122:                return (EIO);
        !           123:        return (0);
        !           124: }
        !           125: 
        !           126: /*
        !           127:  * Vnode op for write
        !           128:  */
        !           129: /* ARGSUSED */
        !           130: dead_write(vp, uio, ioflag, cred)
        !           131:        register struct vnode *vp;
        !           132:        struct uio *uio;
        !           133:        int ioflag;
        !           134:        struct ucred *cred;
        !           135: {
        !           136: 
        !           137:        if (chkvnlock(vp))
        !           138:                panic("dead_write: lock");
        !           139:        return (EIO);
        !           140: }
        !           141: 
        !           142: /*
        !           143:  * Device ioctl operation.
        !           144:  */
        !           145: /* ARGSUSED */
        !           146: dead_ioctl(vp, com, data, fflag, cred)
        !           147:        struct vnode *vp;
        !           148:        register int com;
        !           149:        caddr_t data;
        !           150:        int fflag;
        !           151:        struct ucred *cred;
        !           152: {
        !           153: 
        !           154:        if (!chkvnlock(vp))
        !           155:                return (EBADF);
        !           156:        return (VOP_IOCTL(vp, com, data, fflag, cred));
        !           157: }
        !           158: 
        !           159: /* ARGSUSED */
        !           160: dead_select(vp, which, fflags, cred)
        !           161:        struct vnode *vp;
        !           162:        int which, fflags;
        !           163:        struct ucred *cred;
        !           164: {
        !           165: 
        !           166:        /*
        !           167:         * Let the user find out that the descriptor is gone.
        !           168:         */
        !           169:        return (1);
        !           170: }
        !           171: 
        !           172: /*
        !           173:  * Just call the device strategy routine
        !           174:  */
        !           175: dead_strategy(bp)
        !           176:        register struct buf *bp;
        !           177: {
        !           178: 
        !           179:        if (bp->b_vp == NULL || !chkvnlock(bp->b_vp)) {
        !           180:                bp->b_flags |= B_ERROR;
        !           181:                biodone(bp);
        !           182:                return (EIO);
        !           183:        }
        !           184:        return (VOP_STRATEGY(bp));
        !           185: }
        !           186: 
        !           187: /*
        !           188:  * Wait until the vnode has finished changing state.
        !           189:  */
        !           190: dead_lock(vp)
        !           191:        struct vnode *vp;
        !           192: {
        !           193: 
        !           194:        if (!chkvnlock(vp))
        !           195:                return (0);
        !           196:        return (VOP_LOCK(vp));
        !           197: }
        !           198: 
        !           199: /*
        !           200:  * Wait until the vnode has finished changing state.
        !           201:  */
        !           202: dead_bmap(vp, bn, vpp, bnp)
        !           203:        struct vnode *vp;
        !           204:        daddr_t bn;
        !           205:        struct vnode **vpp;
        !           206:        daddr_t *bnp;
        !           207: {
        !           208: 
        !           209:        if (!chkvnlock(vp))
        !           210:                return (EIO);
        !           211:        return (VOP_BMAP(vp, bn, vpp, bnp));
        !           212: }
        !           213: 
        !           214: /*
        !           215:  * Print out the contents of a dead vnode.
        !           216:  */
        !           217: dead_print(vp)
        !           218:        struct vnode *vp;
        !           219: {
        !           220: 
        !           221:        printf("tag VT_NON, dead vnode\n");
        !           222: }
        !           223: 
        !           224: /*
        !           225:  * Empty vnode failed operation
        !           226:  */
        !           227: dead_ebadf()
        !           228: {
        !           229: 
        !           230:        return (EBADF);
        !           231: }
        !           232: 
        !           233: /*
        !           234:  * Empty vnode bad operation
        !           235:  */
        !           236: dead_badop()
        !           237: {
        !           238: 
        !           239:        panic("dead_badop called");
        !           240:        /* NOTREACHED */
        !           241: }
        !           242: 
        !           243: /*
        !           244:  * Empty vnode null operation
        !           245:  */
        !           246: dead_nullop()
        !           247: {
        !           248: 
        !           249:        return (0);
        !           250: }
        !           251: 
        !           252: /*
        !           253:  * We have to wait during times when the vnode is
        !           254:  * in a state of change.
        !           255:  */
        !           256: chkvnlock(vp)
        !           257:        register struct vnode *vp;
        !           258: {
        !           259:        int locked = 0;
        !           260: 
        !           261:        while (vp->v_flag & VXLOCK) {
        !           262:                vp->v_flag |= VXWANT;
        !           263:                sleep((caddr_t)vp, PINOD);
        !           264:                locked = 1;
        !           265:        }
        !           266:        return (locked);
        !           267: }

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