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Annotation of Net2/miscfs/kernfs/kernfs_vfsops.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1990, 1992 Jan-Simon Pendry
        !             3:  * All rights reserved.
        !             4:  *
        !             5:  * This code is derived from software contributed to Berkeley by
        !             6:  * Jan-Simon Pendry.
        !             7:  *
        !             8:  * Redistribution and use in source and binary forms, with or without
        !             9:  * modification, are permitted provided that the following conditions
        !            10:  * are met:
        !            11:  * 1. Redistributions of source code must retain the above copyright
        !            12:  *    notice, this list of conditions and the following disclaimer.
        !            13:  * 2. Redistributions in binary form must reproduce the above copyright
        !            14:  *    notice, this list of conditions and the following disclaimer in the
        !            15:  *    documentation and/or other materials provided with the distribution.
        !            16:  * 3. All advertising materials mentioning features or use of this software
        !            17:  *    must display the following acknowledgement:
        !            18:  *      This product includes software developed by the University of
        !            19:  *      California, Berkeley and its contributors.
        !            20:  * 4. Neither the name of the University nor the names of its contributors
        !            21:  *    may be used to endorse or promote products derived from this software
        !            22:  *    without specific prior written permission.
        !            23:  *
        !            24:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            25:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            26:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            27:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            28:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            29:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            30:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            31:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            32:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            33:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            34:  * SUCH DAMAGE.
        !            35:  *
        !            36:  *     $Id: kernfs_vfsops.c,v 1.4 1993/03/27 02:00:45 cgd Exp $
        !            37:  */
        !            38: 
        !            39: /*
        !            40:  * Kernel params Filesystem
        !            41:  */
        !            42: 
        !            43: #include "param.h"
        !            44: #include "systm.h"
        !            45: #include "time.h"
        !            46: #include "types.h"
        !            47: #include "proc.h"
        !            48: #include "vnode.h"
        !            49: #include "mount.h"
        !            50: #include "namei.h"
        !            51: #include "malloc.h"
        !            52: #include "conf.h"
        !            53: #include "miscfs/kernfs/kernfs.h"
        !            54: 
        !            55: /* bring in the spec vnodeops for cdevvp */
        !            56: extern struct vnodeops spec_vnodeops;
        !            57: 
        !            58: struct vnode *rrootdevvp;
        !            59: 
        !            60: /*
        !            61:  * cdevvp:
        !            62:  * get a character device node.
        !            63:  * this is used a few places in the miscfs routines.
        !            64:  *
        !            65:  * copied from the bdevvp in kern/vfs_subr.c
        !            66:  */
        !            67: cdevvp(dev, vpp)
        !            68:        dev_t dev;
        !            69:        struct vnode **vpp;
        !            70: {
        !            71:        register struct vnode *vp;
        !            72:        struct vnode *nvp;
        !            73:        int error;
        !            74: 
        !            75:        if (dev == NODEV)
        !            76:                return (0);
        !            77:        error = getnewvnode(VT_NON, (struct mount *)0, &spec_vnodeops, &nvp);
        !            78:        if (error) {
        !            79:                *vpp = 0;
        !            80:                return (error);
        !            81:        }
        !            82:        vp = nvp;
        !            83:        vp->v_type = VCHR;
        !            84:        if (nvp = checkalias(vp, dev, (struct mount *)0)) {
        !            85:                vput(vp);
        !            86:                vp = nvp;
        !            87:        }
        !            88:        *vpp = vp;
        !            89:        return (0);
        !            90: }
        !            91: 
        !            92: kernfs_init()
        !            93: {
        !            94:   int error, bmaj, cmaj;
        !            95: 
        !            96: #ifdef KERNFS_DIAGNOSTIC
        !            97:   printf("kernfs_init\n");                 /* printed during system boot */
        !            98: #endif
        !            99: 
        !           100:   bmaj = major(rootdev);
        !           101: 
        !           102:   /* hunt for the raw root device by looking in cdevsw for a matching
        !           103:    * open routine...
        !           104:    */
        !           105:   for (cmaj = 0; cmaj < nchrdev; cmaj++) {
        !           106:     if (cdevsw[cmaj].d_open == bdevsw[bmaj].d_open) {
        !           107:       dev_t cdev = makedev(cmaj, minor(rootdev));
        !           108:       error = cdevvp(cdev, &rrootdevvp);
        !           109:       if (error == 0)
        !           110:        break;
        !           111:     }
        !           112:   }
        !           113: 
        !           114:   /* this isn't fatal... */
        !           115:   if (error) {
        !           116:     printf("kernfs: no raw boot device\n");
        !           117:     rrootdevvp = 0;
        !           118:   }
        !           119: }
        !           120: 
        !           121: /*
        !           122:  * Mount the kernel parameter filesystem
        !           123:  */
        !           124: kernfs_mount(mp, path, data, ndp, p)
        !           125:        struct mount *mp;
        !           126:        char *path;
        !           127:        caddr_t data;
        !           128:        struct nameidata *ndp;
        !           129:        struct proc *p;
        !           130: {
        !           131:        int error = 0;
        !           132:        u_int size;
        !           133:        struct kernfs_mount *fmp;
        !           134:        struct vnode *rvp;
        !           135: 
        !           136: #ifdef KERNFS_DIAGNOSTIC
        !           137:        printf("kernfs_mount(mp = %x)\n", mp);
        !           138: #endif
        !           139: 
        !           140:        /*
        !           141:         * Update is a no-op
        !           142:         */
        !           143:        if (mp->mnt_flag & MNT_UPDATE)
        !           144:                return (EOPNOTSUPP);
        !           145: 
        !           146:        error = getnewvnode(VT_UFS, mp, &kernfs_vnodeops, &rvp);        /* XXX */
        !           147:        if (error)
        !           148:                return (error);
        !           149: 
        !           150:        fmp = (struct kernfs_mount *) malloc(sizeof(struct kernfs_mount),
        !           151:                                 M_UFSMNT, M_WAITOK);   /* XXX */
        !           152:        rvp->v_type = VDIR;
        !           153:        rvp->v_flag |= VROOT;
        !           154: #ifdef KERNFS_DIAGNOSTIC
        !           155:        printf("kernfs_mount: root vp = %x\n", rvp);
        !           156: #endif
        !           157:        fmp->kf_root = rvp;
        !           158:        mp->mnt_flag |= MNT_LOCAL;
        !           159:        mp->mnt_data = (qaddr_t) fmp;
        !           160:        getnewfsid(mp, MOUNT_KERNFS);
        !           161: 
        !           162:        (void) copyinstr(path, mp->mnt_stat.f_mntonname, MNAMELEN - 1, &size);
        !           163:        bzero(mp->mnt_stat.f_mntonname + size, MNAMELEN - size);
        !           164:        bzero(mp->mnt_stat.f_mntfromname, MNAMELEN);
        !           165:        bcopy("kernfs", mp->mnt_stat.f_mntfromname, sizeof("kernfs"));
        !           166: #ifdef KERNFS_DIAGNOSTIC
        !           167:        printf("kernfs_mount: at %s\n", mp->mnt_stat.f_mntonname);
        !           168: #endif
        !           169:        return (0);
        !           170: }
        !           171: 
        !           172: kernfs_start(mp, flags, p)
        !           173:        struct mount *mp;
        !           174:        int flags;
        !           175:        struct proc *p;
        !           176: {
        !           177:        return (0);
        !           178: }
        !           179: 
        !           180: kernfs_unmount(mp, mntflags, p)
        !           181:        struct mount *mp;
        !           182:        int mntflags;
        !           183:        struct proc *p;
        !           184: {
        !           185:        int error;
        !           186:        int flags = 0;
        !           187:        extern int doforce;
        !           188:        struct vnode *rootvp = VFSTOKERNFS(mp)->kf_root;
        !           189: 
        !           190: #ifdef KERNFS_DIAGNOSTIC
        !           191:        printf("kernfs_unmount(mp = %x)\n", mp);
        !           192: #endif
        !           193: 
        !           194:        if (mntflags & MNT_FORCE) {
        !           195:                /* kernfs can never be rootfs so don't check for it */
        !           196:                if (!doforce)
        !           197:                        return (EINVAL);
        !           198:                flags |= FORCECLOSE;
        !           199:        }
        !           200: 
        !           201:        /*
        !           202:         * Clear out buffer cache.  I don't think we
        !           203:         * ever get anything cached at this level at the
        !           204:         * moment, but who knows...
        !           205:         */
        !           206: #ifdef KERNFS_DIAGNOSTIC
        !           207:        printf("kernfs_unmount: calling mntflushbuf\n");
        !           208: #endif
        !           209:        mntflushbuf(mp, 0); 
        !           210: #ifdef KERNFS_DIAGNOSTIC
        !           211:        printf("kernfs_unmount: calling mntinvalbuf\n");
        !           212: #endif
        !           213:        if (mntinvalbuf(mp, 1))
        !           214:                return (EBUSY);
        !           215:        if (rootvp->v_usecount > 1)
        !           216:                return (EBUSY);
        !           217: #ifdef KERNFS_DIAGNOSTIC
        !           218:        printf("kernfs_unmount: calling vflush\n");
        !           219: #endif
        !           220:        if (error = vflush(mp, rootvp, flags))
        !           221:                return (error);
        !           222: 
        !           223: #ifdef KERNFS_DIAGNOSTIC
        !           224:        vprint("kernfs root", rootvp);
        !           225: #endif  
        !           226:        /*
        !           227:         * Release reference on underlying root vnode
        !           228:         */
        !           229:        vrele(rootvp);
        !           230:        /*
        !           231:         * And blow it away for future re-use
        !           232:         */
        !           233:        vgone(rootvp);
        !           234:        /*
        !           235:         * Finally, throw away the kernfs_mount structure
        !           236:         */
        !           237:        free(mp->mnt_data, M_UFSMNT);   /* XXX */
        !           238:        mp->mnt_data = 0;
        !           239:        return 0;
        !           240: }
        !           241: 
        !           242: kernfs_root(mp, vpp)
        !           243:        struct mount *mp;
        !           244:        struct vnode **vpp;
        !           245: {
        !           246:        struct vnode *vp;
        !           247:        int error;
        !           248: 
        !           249: #ifdef KERNFS_DIAGNOSTIC
        !           250:        printf("kernfs_root(mp = %x)\n", mp);
        !           251: #endif
        !           252: 
        !           253:        /*
        !           254:         * Return locked reference to root.
        !           255:         */
        !           256:        vp = VFSTOKERNFS(mp)->kf_root;
        !           257:        VREF(vp);
        !           258:        VOP_LOCK(vp);
        !           259:        *vpp = vp;
        !           260:        return (0);
        !           261: }
        !           262: 
        !           263: kernfs_quotactl(mp, cmd, uid, arg, p)
        !           264:        struct mount *mp;
        !           265:        int cmd;
        !           266:        uid_t uid;
        !           267:        caddr_t arg;
        !           268:        struct proc *p;
        !           269: {
        !           270:        return (EOPNOTSUPP);
        !           271: }
        !           272: 
        !           273: kernfs_statfs(mp, sbp, p)
        !           274:        struct mount *mp;
        !           275:        struct statfs *sbp;
        !           276:        struct proc *p;
        !           277: {
        !           278:        struct filedesc *fdp;
        !           279:        int lim;
        !           280:        int i;
        !           281:        int last;
        !           282:        int freefd;
        !           283: 
        !           284: #ifdef KERNFS_DIAGNOSTIC
        !           285:        printf("kernfs_statfs(mp = %x)\n", mp);
        !           286: #endif
        !           287: 
        !           288:        sbp->f_type = MOUNT_KERNFS;
        !           289:        sbp->f_flags = 0;
        !           290:        sbp->f_fsize = DEV_BSIZE;
        !           291:        sbp->f_bsize = DEV_BSIZE;
        !           292:        sbp->f_blocks = 2;              /* 1K to keep df happy */
        !           293:        sbp->f_bfree = 0;
        !           294:        sbp->f_bavail = 0;
        !           295:        sbp->f_files = 0;               /* Allow for "." */
        !           296:        sbp->f_ffree = 0;               /* See comments above */
        !           297:        if (sbp != &mp->mnt_stat) {
        !           298:                bcopy(&mp->mnt_stat.f_fsid, &sbp->f_fsid, sizeof(sbp->f_fsid));
        !           299:                bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN);
        !           300:                bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN);
        !           301:        }
        !           302:        return (0);
        !           303: }
        !           304: 
        !           305: kernfs_sync(mp, waitfor)
        !           306:        struct mount *mp;
        !           307:        int waitfor;
        !           308: {
        !           309:        return (0);
        !           310: }
        !           311: 
        !           312: kernfs_fhtovp(mp, fhp, vpp)
        !           313:        struct mount *mp;
        !           314:        struct fid *fhp;
        !           315:        struct vnode **vpp;
        !           316: {
        !           317:        return (EOPNOTSUPP);
        !           318: }
        !           319: 
        !           320: kernfs_vptofh(vp, fhp)
        !           321:        struct vnode *vp;
        !           322:        struct fid *fhp;
        !           323: {
        !           324:        return (EOPNOTSUPP);
        !           325: }
        !           326: 
        !           327: struct vfsops kernfs_vfsops = {
        !           328:        kernfs_mount,
        !           329:        kernfs_start,
        !           330:        kernfs_unmount,
        !           331:        kernfs_root,
        !           332:        kernfs_quotactl,
        !           333:        kernfs_statfs,
        !           334:        kernfs_sync,
        !           335:        kernfs_fhtovp,
        !           336:        kernfs_vptofh,
        !           337:        kernfs_init,
        !           338: };

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