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Annotation of XNU/bsd/miscfs/kernfs/kernfs_vfsops.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
        !             3:  *
        !             4:  * @APPLE_LICENSE_HEADER_START@
        !             5:  * 
        !             6:  * The contents of this file constitute Original Code as defined in and
        !             7:  * are subject to the Apple Public Source License Version 1.1 (the
        !             8:  * "License").  You may not use this file except in compliance with the
        !             9:  * License.  Please obtain a copy of the License at
        !            10:  * http://www.apple.com/publicsource and read it before using this file.
        !            11:  * 
        !            12:  * This Original Code and all software distributed under the License are
        !            13:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
        !            14:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
        !            15:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
        !            16:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
        !            17:  * License for the specific language governing rights and limitations
        !            18:  * under the License.
        !            19:  * 
        !            20:  * @APPLE_LICENSE_HEADER_END@
        !            21:  */
        !            22: /*     $NetBSD: kernfs_vfsops.c,v 1.23 1995/03/09 12:05:52 mycroft Exp $       */
        !            23: 
        !            24: /*
        !            25:  * Copyright (c) 1992, 1993
        !            26:  *     The Regents of the University of California.  All rights reserved.
        !            27:  *
        !            28:  * This code is derived from software donated to Berkeley by
        !            29:  * Jan-Simon Pendry.
        !            30:  *
        !            31:  * Redistribution and use in source and binary forms, with or without
        !            32:  * modification, are permitted provided that the following conditions
        !            33:  * are met:
        !            34:  * 1. Redistributions of source code must retain the above copyright
        !            35:  *    notice, this list of conditions and the following disclaimer.
        !            36:  * 2. Redistributions in binary form must reproduce the above copyright
        !            37:  *    notice, this list of conditions and the following disclaimer in the
        !            38:  *    documentation and/or other materials provided with the distribution.
        !            39:  * 3. All advertising materials mentioning features or use of this software
        !            40:  *    must display the following acknowledgement:
        !            41:  *     This product includes software developed by the University of
        !            42:  *     California, Berkeley and its contributors.
        !            43:  * 4. Neither the name of the University nor the names of its contributors
        !            44:  *    may be used to endorse or promote products derived from this software
        !            45:  *    without specific prior written permission.
        !            46:  *
        !            47:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            48:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            49:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            50:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            51:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            52:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            53:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            54:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            55:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            56:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            57:  * SUCH DAMAGE.
        !            58:  *
        !            59:  *     @(#)kernfs_vfsops.c     8.5 (Berkeley) 6/15/94
        !            60:  */
        !            61: 
        !            62: /*
        !            63:  * Kernel params Filesystem
        !            64:  */
        !            65: 
        !            66: #include <sys/param.h>
        !            67: #include <sys/systm.h>
        !            68: #include <sys/conf.h>
        !            69: #include <sys/types.h>
        !            70: #include <sys/proc.h>
        !            71: #include <sys/vnode.h>
        !            72: #include <sys/mount.h>
        !            73: #include <sys/namei.h>
        !            74: #include <sys/malloc.h>
        !            75: 
        !            76: #include <miscfs/specfs/specdev.h>
        !            77: #include <miscfs/kernfs/kernfs.h>
        !            78: 
        !            79: dev_t rrootdev = NODEV;
        !            80: 
        !            81: kernfs_init()
        !            82: {
        !            83: 
        !            84: }
        !            85: 
        !            86: void
        !            87: kernfs_get_rrootdev()
        !            88: {
        !            89:        static int tried = 0;
        !            90:        int cmaj;
        !            91: 
        !            92:        if (tried) {
        !            93:                /* Already did it once. */
        !            94:                return;
        !            95:        }
        !            96:        tried = 1;
        !            97: 
        !            98:        if (rootdev == NODEV)
        !            99:                return;
        !           100:        for (cmaj = 0; cmaj < nchrdev; cmaj++) {
        !           101:                rrootdev = makedev(cmaj, minor(rootdev));
        !           102:                if (chrtoblk(rrootdev) == rootdev)
        !           103:                        return;
        !           104:        }
        !           105:        rrootdev = NODEV;
        !           106:        printf("kernfs_get_rrootdev: no raw root device\n");
        !           107: }
        !           108: 
        !           109: /*
        !           110:  * Mount the Kernel params filesystem
        !           111:  */
        !           112: kernfs_mount(mp, path, data, ndp, p)
        !           113:        struct mount *mp;
        !           114:        char *path;
        !           115:        caddr_t data;
        !           116:        struct nameidata *ndp;
        !           117:        struct proc *p;
        !           118: {
        !           119:        int error = 0;
        !           120:        size_t size;
        !           121:        struct kernfs_mount *fmp;
        !           122:        struct vnode *rvp;
        !           123: 
        !           124: #ifdef KERNFS_DIAGNOSTIC
        !           125:        printf("kernfs_mount(mp = %x)\n", mp);
        !           126: #endif
        !           127: 
        !           128:        /*
        !           129:         * Update is a no-op
        !           130:         */
        !           131:        if (mp->mnt_flag & MNT_UPDATE)
        !           132:                return (EOPNOTSUPP);
        !           133: 
        !           134:        MALLOC(fmp, struct kernfs_mount *, sizeof(struct kernfs_mount),
        !           135:            M_MISCFSMNT, M_WAITOK);
        !           136:        if (error = getnewvnode(VT_KERNFS, mp, kernfs_vnodeop_p, &rvp)) {
        !           137:                FREE(fmp, M_MISCFSMNT);
        !           138:                return (error);
        !           139:        }
        !           140: 
        !           141:        rvp->v_type = VDIR;
        !           142:        rvp->v_flag |= VROOT;
        !           143: #ifdef KERNFS_DIAGNOSTIC
        !           144:        printf("kernfs_mount: root vp = %x\n", rvp);
        !           145: #endif
        !           146:        fmp->kf_root = rvp;
        !           147:        mp->mnt_flag |= MNT_LOCAL;
        !           148:        mp->mnt_data = (qaddr_t)fmp;
        !           149:        getnewfsid(mp, makefstype(MOUNT_KERNFS));
        !           150: 
        !           151:        (void) copyinstr(path, mp->mnt_stat.f_mntonname, MNAMELEN - 1, &size);
        !           152:        bzero(mp->mnt_stat.f_mntonname + size, MNAMELEN - size);
        !           153:        bzero(mp->mnt_stat.f_mntfromname, MNAMELEN);
        !           154:        bcopy("kernfs", mp->mnt_stat.f_mntfromname, sizeof("kernfs"));
        !           155: #ifdef KERNFS_DIAGNOSTIC
        !           156:        printf("kernfs_mount: at %s\n", mp->mnt_stat.f_mntonname);
        !           157: #endif
        !           158: 
        !           159:        kernfs_get_rrootdev();
        !           160:        return (0);
        !           161: }
        !           162: 
        !           163: kernfs_start(mp, flags, p)
        !           164:        struct mount *mp;
        !           165:        int flags;
        !           166:        struct proc *p;
        !           167: {
        !           168: 
        !           169:        return (0);
        !           170: }
        !           171: 
        !           172: kernfs_unmount(mp, mntflags, p)
        !           173:        struct mount *mp;
        !           174:        int mntflags;
        !           175:        struct proc *p;
        !           176: {
        !           177:        int error;
        !           178:        int flags = 0;
        !           179:        extern int doforce;
        !           180:        struct vnode *rootvp = VFSTOKERNFS(mp)->kf_root;
        !           181: 
        !           182: #ifdef KERNFS_DIAGNOSTIC
        !           183:        printf("kernfs_unmount(mp = %x)\n", mp);
        !           184: #endif
        !           185: 
        !           186:        if (mntflags & MNT_FORCE) {
        !           187:                /* kernfs can never be rootfs so don't check for it */
        !           188:                if (!doforce)
        !           189:                        return (EINVAL);
        !           190:                flags |= FORCECLOSE;
        !           191:        }
        !           192: 
        !           193:        /*
        !           194:         * Clear out buffer cache.  I don't think we
        !           195:         * ever get anything cached at this level at the
        !           196:         * moment, but who knows...
        !           197:         */
        !           198:        if (rootvp->v_usecount > 1)
        !           199:                return (EBUSY);
        !           200: #ifdef KERNFS_DIAGNOSTIC
        !           201:        printf("kernfs_unmount: calling vflush\n");
        !           202: #endif
        !           203:        if (error = vflush(mp, rootvp, flags))
        !           204:                return (error);
        !           205: 
        !           206: #ifdef KERNFS_DIAGNOSTIC
        !           207:        vprint("kernfs root", rootvp);
        !           208: #endif
        !           209:        /*
        !           210:         * Clean out the old root vnode for reuse.
        !           211:         */
        !           212:        vrele(rootvp);
        !           213:        vgone(rootvp);
        !           214:        /*
        !           215:         * Finally, throw away the kernfs_mount structure
        !           216:         */
        !           217:        free(mp->mnt_data, M_MISCFSMNT);
        !           218:        mp->mnt_data = 0;
        !           219:        return (0);
        !           220: }
        !           221: 
        !           222: kernfs_root(mp, vpp)
        !           223:        struct mount *mp;
        !           224:        struct vnode **vpp;
        !           225: {
        !           226:        struct vnode *vp;
        !           227: 
        !           228: #ifdef KERNFS_DIAGNOSTIC
        !           229:        printf("kernfs_root(mp = %x)\n", mp);
        !           230: #endif
        !           231: 
        !           232:        /*
        !           233:         * Return locked reference to root.
        !           234:         */
        !           235:        vp = VFSTOKERNFS(mp)->kf_root;
        !           236:        VREF(vp);
        !           237:        VOP_LOCK(vp);
        !           238:        *vpp = vp;
        !           239:        return (0);
        !           240: }
        !           241: 
        !           242: kernfs_quotactl(mp, cmd, uid, arg, p)
        !           243:        struct mount *mp;
        !           244:        int cmd;
        !           245:        uid_t uid;
        !           246:        caddr_t arg;
        !           247:        struct proc *p;
        !           248: {
        !           249: 
        !           250:        return (EOPNOTSUPP);
        !           251: }
        !           252: 
        !           253: kernfs_statfs(mp, sbp, p)
        !           254:        struct mount *mp;
        !           255:        struct statfs *sbp;
        !           256:        struct proc *p;
        !           257: {
        !           258: 
        !           259: #ifdef KERNFS_DIAGNOSTIC
        !           260:        printf("kernfs_statfs(mp = %x)\n", mp);
        !           261: #endif
        !           262: 
        !           263: #ifdef COMPAT_09
        !           264:        sbp->f_type = 7;
        !           265: #else
        !           266:        sbp->f_type = 0;
        !           267: #endif
        !           268:        sbp->f_bsize = DEV_BSIZE;
        !           269:        sbp->f_iosize = DEV_BSIZE;
        !           270:        sbp->f_blocks = 2;              /* 1K to keep df happy */
        !           271:        sbp->f_bfree = 0;
        !           272:        sbp->f_bavail = 0;
        !           273:        sbp->f_files = 0;
        !           274:        sbp->f_ffree = 0;
        !           275:        if (sbp != &mp->mnt_stat) {
        !           276:                bcopy(&mp->mnt_stat.f_fsid, &sbp->f_fsid, sizeof(sbp->f_fsid));
        !           277:                bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN);
        !           278:                bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN);
        !           279:        }
        !           280:        strncpy(sbp->f_fstypename, mp->mnt_op->vfs_name, MFSNAMELEN);
        !           281:        sbp->f_fstypename[MFSNAMELEN] = '\0';
        !           282:        return (0);
        !           283: }
        !           284: 
        !           285: kernfs_sync(mp, waitfor)
        !           286:        struct mount *mp;
        !           287:        int waitfor;
        !           288: {
        !           289: 
        !           290:        return (0);
        !           291: }
        !           292: 
        !           293: /*
        !           294:  * Kernfs flat namespace lookup.
        !           295:  * Currently unsupported.
        !           296:  */
        !           297: kernfs_vget(mp, ino, vpp)
        !           298:        struct mount *mp;
        !           299:        ino_t ino;
        !           300:        struct vnode **vpp;
        !           301: {
        !           302: 
        !           303:        return (EOPNOTSUPP);
        !           304: }
        !           305: 
        !           306: 
        !           307: kernfs_fhtovp(mp, fhp, setgen, vpp)
        !           308:        struct mount *mp;
        !           309:        struct fid *fhp;
        !           310:        int setgen;
        !           311:        struct vnode **vpp;
        !           312: {
        !           313: 
        !           314:        return (EOPNOTSUPP);
        !           315: }
        !           316: 
        !           317: kernfs_vptofh(vp, fhp)
        !           318:        struct vnode *vp;
        !           319:        struct fid *fhp;
        !           320: {
        !           321: 
        !           322:        return (EOPNOTSUPP);
        !           323: }
        !           324: 
        !           325: struct vfsops kernfs_vfsops = {
        !           326:        MOUNT_KERNFS,
        !           327:        kernfs_mount,
        !           328:        kernfs_start,
        !           329:        kernfs_unmount,
        !           330:        kernfs_root,
        !           331:        kernfs_quotactl,
        !           332:        kernfs_statfs,
        !           333:        kernfs_sync,
        !           334:        kernfs_vget,
        !           335:        kernfs_fhtovp,
        !           336:        kernfs_vptofh,
        !           337:        kernfs_init,
        !           338: };

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