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Annotation of Net2/miscfs/fdesc/fdesc_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: fdesc_vfsops.c,v 1.2 1993/03/25 06:00:18 cgd Exp $
        !            37:  */
        !            38: 
        !            39: /*
        !            40:  * /dev/fd 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 "resourcevar.h"
        !            49: #include "filedesc.h"
        !            50: #include "vnode.h"
        !            51: #include "mount.h"
        !            52: #include "namei.h"
        !            53: #include "malloc.h"
        !            54: #include "miscfs/fdesc/fdesc.h"
        !            55: 
        !            56: static u_short fdesc_mntid;
        !            57: 
        !            58: fdesc_init()
        !            59: {
        !            60: #ifdef FDESC_DIAGNOSTIC
        !            61:        printf("fdesc_init\n");         /* printed during system boot */
        !            62: #endif
        !            63: }
        !            64: 
        !            65: /*
        !            66:  * Mount the per-process file descriptors (/dev/fd)
        !            67:  */
        !            68: fdesc_mount(mp, path, data, ndp, p)
        !            69:        struct mount *mp;
        !            70:        char *path;
        !            71:        caddr_t data;
        !            72:        struct nameidata *ndp;
        !            73:        struct proc *p;
        !            74: {
        !            75:        int error = 0;
        !            76:        u_int size;
        !            77:        struct fdescmount *fmp;
        !            78:        struct vnode *rvp;
        !            79: 
        !            80: #ifdef FDESC_DIAGNOSTIC
        !            81:        printf("fdesc_mount(mp = %x)\n", mp);
        !            82: #endif
        !            83: 
        !            84:        /*
        !            85:         * Update is a no-op
        !            86:         */
        !            87:        if (mp->mnt_flag & MNT_UPDATE)
        !            88:                return (EOPNOTSUPP);
        !            89: 
        !            90:        error = getnewvnode(VT_UFS, mp, &fdesc_vnodeops, &rvp); /* XXX */
        !            91:        if (error)
        !            92:                return (error);
        !            93: 
        !            94:        fmp = (struct fdescmount *) malloc(sizeof(struct fdescmount),
        !            95:                                 M_UFSMNT, M_WAITOK);   /* XXX */
        !            96:        rvp->v_type = VDIR;
        !            97:        rvp->v_flag |= VROOT;
        !            98:        /*VTOFDESC(rvp)->f_isroot = 1;*/
        !            99: #ifdef FDESC_DIAGNOSTIC
        !           100:        printf("fdesc_mount: root vp = %x\n", rvp);
        !           101: #endif
        !           102:        fmp->f_root = rvp;
        !           103:        mp->mnt_flag |= MNT_LOCAL;
        !           104:        mp->mnt_data = (qaddr_t) fmp;
        !           105:        getnewfsid(mp, MOUNT_FDESC);
        !           106: 
        !           107:        (void) copyinstr(path, mp->mnt_stat.f_mntonname, MNAMELEN - 1, &size);
        !           108:        bzero(mp->mnt_stat.f_mntonname + size, MNAMELEN - size);
        !           109:        bzero(mp->mnt_stat.f_mntfromname, MNAMELEN);
        !           110:        bcopy("fdesc", mp->mnt_stat.f_mntfromname, sizeof("fdesc"));
        !           111: #ifdef FDESC_DIAGNOSTIC
        !           112:        printf("fdesc_mount: at %s\n", mp->mnt_stat.f_mntonname);
        !           113: #endif
        !           114:        return (0);
        !           115: }
        !           116: 
        !           117: fdesc_start(mp, flags, p)
        !           118:        struct mount *mp;
        !           119:        int flags;
        !           120:        struct proc *p;
        !           121: {
        !           122:        return (0);
        !           123: }
        !           124: 
        !           125: fdesc_unmount(mp, mntflags, p)
        !           126:        struct mount *mp;
        !           127:        int mntflags;
        !           128:        struct proc *p;
        !           129: {
        !           130:        int error;
        !           131:        int flags = 0;
        !           132:        extern int doforce;
        !           133:        struct vnode *rootvp = VFSTOFDESC(mp)->f_root;
        !           134: 
        !           135: #ifdef FDESC_DIAGNOSTIC
        !           136:        printf("fdesc_unmount(mp = %x)\n", mp);
        !           137: #endif
        !           138: 
        !           139:        if (mntflags & MNT_FORCE) {
        !           140:                /* fdesc can never be rootfs so don't check for it */
        !           141:                if (!doforce)
        !           142:                        return (EINVAL);
        !           143:                flags |= FORCECLOSE;
        !           144:        }
        !           145: 
        !           146:        /*
        !           147:         * Clear out buffer cache.  I don't think we
        !           148:         * ever get anything cached at this level at the
        !           149:         * moment, but who knows...
        !           150:         */
        !           151: #ifdef FDESC_DIAGNOSTIC
        !           152:        printf("fdesc_unmount: calling mntflushbuf\n");
        !           153: #endif
        !           154:        mntflushbuf(mp, 0); 
        !           155: #ifdef FDESC_DIAGNOSTIC
        !           156:        printf("fdesc_unmount: calling mntinvalbuf\n");
        !           157: #endif
        !           158:        if (mntinvalbuf(mp, 1))
        !           159:                return (EBUSY);
        !           160:        if (rootvp->v_usecount > 1)
        !           161:                return (EBUSY);
        !           162: #ifdef FDESC_DIAGNOSTIC
        !           163:        printf("fdesc_unmount: calling vflush\n");
        !           164: #endif
        !           165:        if (error = vflush(mp, rootvp, flags))
        !           166:                return (error);
        !           167: 
        !           168: #ifdef FDESC_DIAGNOSTIC
        !           169:        vprint("fdesc root", rootvp);
        !           170: #endif  
        !           171:        /*
        !           172:         * Release reference on underlying root vnode
        !           173:         */
        !           174:        vrele(rootvp);
        !           175:        /*
        !           176:         * And blow it away for future re-use
        !           177:         */
        !           178:        vgone(rootvp);
        !           179:        /*
        !           180:         * Finally, throw away the fdescmount structure
        !           181:         */
        !           182:        free(mp->mnt_data, M_UFSMNT);   /* XXX */
        !           183:        mp->mnt_data = 0;
        !           184:        return 0;
        !           185: }
        !           186: 
        !           187: fdesc_root(mp, vpp)
        !           188:        struct mount *mp;
        !           189:        struct vnode **vpp;
        !           190: {
        !           191:        struct vnode *vp;
        !           192:        int error;
        !           193: 
        !           194: #ifdef FDESC_DIAGNOSTIC
        !           195:        printf("fdesc_root(mp = %x)\n", mp);
        !           196: #endif
        !           197: 
        !           198:        /*
        !           199:         * Return locked reference to root.
        !           200:         */
        !           201:        vp = VFSTOFDESC(mp)->f_root;
        !           202:        VREF(vp);
        !           203:        VOP_LOCK(vp);
        !           204:        *vpp = vp;
        !           205:        return (0);
        !           206: }
        !           207: 
        !           208: fdesc_quotactl(mp, cmd, uid, arg, p)
        !           209:        struct mount *mp;
        !           210:        int cmd;
        !           211:        uid_t uid;
        !           212:        caddr_t arg;
        !           213:        struct proc *p;
        !           214: {
        !           215:        return (EOPNOTSUPP);
        !           216: }
        !           217: 
        !           218: fdesc_statfs(mp, sbp, p)
        !           219:        struct mount *mp;
        !           220:        struct statfs *sbp;
        !           221:        struct proc *p;
        !           222: {
        !           223:        struct filedesc *fdp;
        !           224:        int lim;
        !           225:        int i;
        !           226:        int last;
        !           227:        int freefd;
        !           228: 
        !           229: #ifdef FDESC_DIAGNOSTIC
        !           230:        printf("fdesc_statfs(mp = %x)\n", mp);
        !           231: #endif
        !           232: 
        !           233:        /*
        !           234:         * Compute number of free file descriptors.
        !           235:         * [ Strange results will ensue if the open file
        !           236:         * limit is ever reduced below the current number
        !           237:         * of open files... ]
        !           238:         */
        !           239:        lim = p->p_rlimit[RLIMIT_OFILE].rlim_cur;
        !           240:        fdp = p->p_fd;
        !           241:        last = min(fdp->fd_nfiles, lim);
        !           242:        freefd = 0;
        !           243:        for (i = fdp->fd_freefile; i < last; i++)
        !           244:                if (fdp->fd_ofiles[i] == NULL)
        !           245:                        freefd++;
        !           246: 
        !           247:        /*
        !           248:         * Adjust for the fact that the fdesc array may not
        !           249:         * have been fully allocated yet.
        !           250:         */
        !           251:        if (fdp->fd_nfiles < lim)
        !           252:                freefd += (lim - fdp->fd_nfiles);
        !           253: 
        !           254:        sbp->f_type = MOUNT_FDESC;
        !           255:        sbp->f_flags = 0;
        !           256:        sbp->f_fsize = DEV_BSIZE;
        !           257:        sbp->f_bsize = DEV_BSIZE;
        !           258:        sbp->f_blocks = 2;              /* 1K to keep df happy */
        !           259:        sbp->f_bfree = 0;
        !           260:        sbp->f_bavail = 0;
        !           261:        sbp->f_files = lim + 1;         /* Allow for "." */
        !           262:        sbp->f_ffree = freefd;          /* See comments above */
        !           263:        if (sbp != &mp->mnt_stat) {
        !           264:                bcopy(&mp->mnt_stat.f_fsid, &sbp->f_fsid, sizeof(sbp->f_fsid));
        !           265:                bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN);
        !           266:                bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN);
        !           267:        }
        !           268:        return (0);
        !           269: }
        !           270: 
        !           271: fdesc_sync(mp, waitfor)
        !           272:        struct mount *mp;
        !           273:        int waitfor;
        !           274: {
        !           275:        return (0);
        !           276: }
        !           277: 
        !           278: fdesc_fhtovp(mp, fhp, vpp)
        !           279:        struct mount *mp;
        !           280:        struct fid *fhp;
        !           281:        struct vnode **vpp;
        !           282: {
        !           283:        return (EOPNOTSUPP);
        !           284: }
        !           285: 
        !           286: fdesc_vptofh(vp, fhp)
        !           287:        struct vnode *vp;
        !           288:        struct fid *fhp;
        !           289: {
        !           290:        return (EOPNOTSUPP);
        !           291: }
        !           292: 
        !           293: struct vfsops fdesc_vfsops = {
        !           294:        fdesc_mount,
        !           295:        fdesc_start,
        !           296:        fdesc_unmount,
        !           297:        fdesc_root,
        !           298:        fdesc_quotactl,
        !           299:        fdesc_statfs,
        !           300:        fdesc_sync,
        !           301:        fdesc_fhtovp,
        !           302:        fdesc_vptofh,
        !           303:        fdesc_init,
        !           304: };

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