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Annotation of XNU/bsd/miscfs/devfs/devfs_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: /*-
        !            23:  * Copyright 1997,1998 Julian Elischer.  All rights reserved.
        !            24:  * [email protected]
        !            25:  * 
        !            26:  * Redistribution and use in source and binary forms, with or without
        !            27:  * modification, are permitted provided that the following conditions are
        !            28:  * met:
        !            29:  *  1. Redistributions of source code must retain the above copyright
        !            30:  *     notice, this list of conditions and the following disclaimer.
        !            31:  *  2. Redistributions in binary form must reproduce the above copyright notice,
        !            32:  *     this list of conditions and the following disclaimer in the documentation
        !            33:  *     and/or other materials provided with the distribution.
        !            34:  * 
        !            35:  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER ``AS IS'' AND ANY EXPRESS
        !            36:  * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
        !            37:  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
        !            38:  * DISCLAIMED.  IN NO EVENT SHALL THE HOLDER OR CONTRIBUTORS BE LIABLE FOR
        !            39:  * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            40:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
        !            41:  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
        !            42:  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            43:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            44:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            45:  * SUCH DAMAGE.
        !            46:  * 
        !            47:  * devfs_vfsops.c
        !            48:  *
        !            49:  */
        !            50: /*
        !            51:  * HISTORY
        !            52:  *  Dieter Siegmund ([email protected]) Wed Jul 14 13:37:59 PDT 1999
        !            53:  *  - modified devfs_statfs() to use devfs_stats to calculate the
        !            54:  *    amount of memory used by devfs
        !            55:  */
        !            56: 
        !            57: 
        !            58: #include <sys/param.h>
        !            59: #include <sys/systm.h>
        !            60: #include <sys/kernel.h>
        !            61: #include <sys/vnode.h>
        !            62: #include <sys/proc.h>
        !            63: #include <sys/mount.h>
        !            64: #include <sys/malloc.h>
        !            65: 
        !            66: #include "devfs.h"
        !            67: #include "devfsdefs.h"
        !            68: 
        !            69: static int devfs_statfs( struct mount *mp, struct statfs *sbp, struct proc *p);
        !            70: 
        !            71: static struct vfsconf * devfs_vfsp = 0;
        !            72: static int             kernel_mount = 0;
        !            73: 
        !            74: 
        !            75: /*-
        !            76:  * Called from the generic VFS startups.
        !            77:  * This is the second stage of DEVFS initialisation.
        !            78:  * The probed devices have already been loaded and the 
        !            79:  * basic structure of the DEVFS created.
        !            80:  * We take the oportunity to mount the hidden DEVFS layer, so that
        !            81:  * devices from devfs get sync'd.
        !            82:  */
        !            83: static int
        !            84: devfs_init(struct vfsconf *vfsp)
        !            85: {
        !            86:     devfs_vfsp = vfsp; /* remember this for devfs_kernel_mount below */
        !            87: 
        !            88:     if (devfs_sinit())
        !            89:        return (EOPNOTSUPP);
        !            90:     printf("devfs enabled\n");
        !            91:     devfs_make_node(makedev(0, 0), DEVFS_CHAR, 
        !            92:                    UID_ROOT, GID_WHEEL, 0622, "console");
        !            93:     devfs_make_node(makedev(2, 0), DEVFS_CHAR, 
        !            94:                    UID_ROOT, GID_WHEEL, 0666, "tty");
        !            95:     devfs_make_node(makedev(3, 0), DEVFS_CHAR, 
        !            96:                    UID_ROOT, GID_KMEM, 0640, "mem");
        !            97:     devfs_make_node(makedev(3, 1), DEVFS_CHAR, 
        !            98:                    UID_ROOT, GID_KMEM, 0640, "kmem");
        !            99:     devfs_make_node(makedev(3, 2), DEVFS_CHAR, 
        !           100:                    UID_ROOT, GID_WHEEL, 0666, "null");
        !           101:     devfs_make_node(makedev(6, 0), DEVFS_CHAR, 
        !           102:                    UID_ROOT, GID_WHEEL, 0600, "klog");
        !           103:     devfs_make_node(makedev(37, 0), DEVFS_CHAR, 
        !           104:                    UID_ROOT, GID_WHEEL, 0600, "nvram");
        !           105:     return 0;
        !           106: }
        !           107: 
        !           108: /*-
        !           109:  *  mp  - pointer to 'mount' structure
        !           110:  *  path - addr in user space of mount point (ie /usr or whatever)
        !           111:  *  data - addr in user space of mount params including the
        !           112:  *         name of the block special file to treat as a filesystem.
        !           113:  *         (NOT USED)
        !           114:  *  ndp  - namei data pointer (NOT USED)
        !           115:  *  p    - proc pointer
        !           116:  * devfs is special in that it doesn't require any device to be mounted..
        !           117:  * It makes up its data as it goes along.
        !           118:  * it must be mounted during single user.. until it is, only std{in/out/err}
        !           119:  * and the root filesystem are available.
        !           120:  */
        !           121: /*proto*/
        !           122: int
        !           123: devfs_mount(struct mount *mp, char *path, caddr_t data,
        !           124:            struct nameidata *ndp, struct proc *p)
        !           125: {
        !           126:        struct devfsmount *devfs_mp_p;  /* devfs specific mount info */
        !           127:        int error;
        !           128:        size_t size;
        !           129: 
        !           130:        /*-
        !           131:         *  If they just want to update, we don't need to do anything.
        !           132:         */
        !           133:        if (mp->mnt_flag & MNT_UPDATE)
        !           134:        {
        !           135:                return 0;
        !           136:        }
        !           137: 
        !           138:        /*-
        !           139:         *  Well, it's not an update, it's a real mount request.
        !           140:         *  Time to get dirty.
        !           141:         * HERE we should check to see if we are already mounted here.
        !           142:         */
        !           143: 
        !           144:        MALLOC(devfs_mp_p, struct devfsmount *, sizeof(struct devfsmount),
        !           145:               M_DEVFSMNT, M_WAITOK);
        !           146:        if (devfs_mp_p == NULL)
        !           147:                return (ENOMEM);
        !           148:        bzero(devfs_mp_p,sizeof(*devfs_mp_p));
        !           149:        devfs_mp_p->mount = mp;
        !           150: 
        !           151:        /*-
        !           152:         *  Fill out some fields
        !           153:         */
        !           154:        mp->mnt_data = (qaddr_t)devfs_mp_p;
        !           155:        mp->mnt_stat.f_type = mp->mnt_vfc->vfc_typenum;
        !           156:        mp->mnt_stat.f_fsid.val[0] = (int32_t)(void *)devfs_mp_p;
        !           157:        mp->mnt_stat.f_fsid.val[1] = mp->mnt_stat.f_type;
        !           158:        mp->mnt_flag |= MNT_LOCAL;
        !           159: 
        !           160:        DEVFS_LOCK(p);
        !           161:        error = dev_dup_plane(devfs_mp_p);
        !           162:        DEVFS_UNLOCK(p);
        !           163:        if (error) {
        !           164:                mp->mnt_data = (qaddr_t)0;
        !           165:                FREE((caddr_t)devfs_mp_p, M_DEVFSMNT);
        !           166:                return (error);
        !           167:        }
        !           168: 
        !           169:        /*-
        !           170:         *  Copy in the name of the directory the filesystem
        !           171:         *  is to be mounted on.
        !           172:         *  And we clear the remainder of the character strings
        !           173:         *  to be tidy.
        !           174:         */
        !           175:        
        !           176:        if (!kernel_mount) {
        !           177:                copyinstr(path, (caddr_t)mp->mnt_stat.f_mntonname,
        !           178:                        sizeof(mp->mnt_stat.f_mntonname)-1, &size);
        !           179:                bzero(mp->mnt_stat.f_mntonname + size,
        !           180:                        sizeof(mp->mnt_stat.f_mntonname) - size);
        !           181:        }
        !           182:        bzero(mp->mnt_stat.f_mntfromname, MNAMELEN);
        !           183:        bcopy("devfs",mp->mnt_stat.f_mntfromname, 5);
        !           184:        DEVFS_INCR_MOUNTS();
        !           185:        (void)devfs_statfs(mp, &mp->mnt_stat, p);
        !           186:        return 0;
        !           187: }
        !           188: 
        !           189: 
        !           190: static int
        !           191: devfs_start(struct mount *mp, int flags, struct proc *p)
        !           192: {
        !           193:        return 0;
        !           194: }
        !           195: 
        !           196: /*-
        !           197:  *  Unmount the filesystem described by mp.
        !           198:  */
        !           199: static int
        !           200: devfs_unmount( struct mount *mp, int mntflags, struct proc *p)
        !           201: {
        !           202:        struct devfsmount *devfs_mp_p = (struct devfsmount *)mp->mnt_data;
        !           203:        int flags = 0;
        !           204:        int error;
        !           205:        
        !           206:        if (mntflags & MNT_FORCE) {
        !           207:                flags |= FORCECLOSE;
        !           208:        }
        !           209:        error = vflush(mp, NULLVP, flags);
        !           210:        if (error)
        !           211:                return error;
        !           212: 
        !           213:        DEVFS_LOCK(p);
        !           214:        devfs_free_plane(devfs_mp_p);
        !           215:        DEVFS_UNLOCK(p);
        !           216:        FREE((caddr_t)devfs_mp_p, M_DEVFSMNT);
        !           217:        DEVFS_DECR_MOUNTS();
        !           218:        mp->mnt_data = (qaddr_t)0;
        !           219:        mp->mnt_flag &= ~MNT_LOCAL;
        !           220: 
        !           221:        return 0;
        !           222: }
        !           223: 
        !           224: /* return the address of the root vnode  in *vpp */
        !           225: static int
        !           226: devfs_root(struct mount *mp, struct vnode **vpp)
        !           227: {
        !           228:        struct devfsmount *devfs_mp_p = (struct devfsmount *)(mp->mnt_data);
        !           229:        int error;
        !           230: 
        !           231:        error = devfs_dntovn(devfs_mp_p->plane_root->de_dnp,vpp, 
        !           232:                             current_proc());
        !           233:        return error;
        !           234: }
        !           235: 
        !           236: static int
        !           237: devfs_quotactl(struct mount *mp, int cmds, uid_t uid, caddr_t arg,
        !           238:               struct proc *p)
        !           239: {
        !           240:        return EOPNOTSUPP;
        !           241: }
        !           242: 
        !           243: static int
        !           244: devfs_statfs( struct mount *mp, struct statfs *sbp, struct proc *p)
        !           245: {
        !           246:        struct devfsmount *devfs_mp_p = (struct devfsmount *)mp->mnt_data;
        !           247: 
        !           248:        /*-
        !           249:         *  Fill in the stat block.
        !           250:         */
        !           251:        sbp->f_type   = mp->mnt_stat.f_type;
        !           252:        sbp->f_flags  = 0;              /* XXX */
        !           253:        sbp->f_bsize  = 512;
        !           254:        sbp->f_iosize = 512;
        !           255:        sbp->f_blocks = (devfs_stats.mounts * sizeof(struct devfsmount)
        !           256:                         + devfs_stats.nodes * sizeof(devnode_t)
        !           257:                         + devfs_stats.entries * sizeof(devdirent_t)
        !           258:                         + devfs_stats.stringspace
        !           259:                         ) / sbp->f_bsize;
        !           260:        sbp->f_bfree  = 0;
        !           261:        sbp->f_bavail = 0;
        !           262:        sbp->f_files  = devfs_stats.nodes;
        !           263:        sbp->f_ffree  = 0;
        !           264:        sbp->f_fsid.val[0] = (int32_t)(void *)devfs_mp_p;
        !           265:        sbp->f_fsid.val[1] = mp->mnt_stat.f_type;
        !           266: 
        !           267:        /*-
        !           268:         *  Copy the mounted on and mounted from names into
        !           269:         *  the passed in stat block, if it is not the one
        !           270:         *  in the mount structure.
        !           271:         */
        !           272:        if (sbp != &mp->mnt_stat) {
        !           273:                bcopy((caddr_t)mp->mnt_stat.f_mntonname,
        !           274:                        (caddr_t)&sbp->f_mntonname[0], MNAMELEN);
        !           275:                bcopy((caddr_t)mp->mnt_stat.f_mntfromname,
        !           276:                        (caddr_t)&sbp->f_mntfromname[0], MNAMELEN);
        !           277:        }
        !           278:        return 0;
        !           279: }
        !           280: 
        !           281: static int
        !           282: devfs_sync(struct mount *mp, int waitfor,struct ucred *cred,struct proc *p)
        !           283: {
        !           284:     return (0);
        !           285: }
        !           286: 
        !           287: 
        !           288: static int
        !           289: devfs_vget(struct mount *mp, void * ino,struct vnode **vpp)
        !           290: {
        !           291:        return EOPNOTSUPP;
        !           292: }
        !           293: 
        !           294: /*************************************************************
        !           295:  * The concept of exporting a kernel generated devfs is stupid
        !           296:  * So don't handle filehandles
        !           297:  */
        !           298: 
        !           299: static int
        !           300: devfs_fhtovp (struct mount *mp, struct fid *fhp, struct mbuf *nam,
        !           301:              struct vnode **vpp, int *exflagsp, struct ucred **credanonp)
        !           302: {
        !           303:        return (EINVAL);
        !           304: }
        !           305: 
        !           306: 
        !           307: static int
        !           308: devfs_vptofh (struct vnode *vp, struct fid *fhp)
        !           309: {
        !           310:        return (EINVAL);
        !           311: }
        !           312: 
        !           313: static int
        !           314: devfs_sysctl(name, namelen, oldp, oldlenp, newp, newlen, p)
        !           315:        int *name;
        !           316:        u_int namelen;
        !           317:        void *oldp;
        !           318:        size_t *oldlenp;
        !           319:        void *newp;
        !           320:        size_t newlen;
        !           321:        struct proc *p;
        !           322: {
        !           323:     return (EOPNOTSUPP);
        !           324: }
        !           325: 
        !           326: #include <sys/namei.h>
        !           327: 
        !           328: /*
        !           329:  * Function: devfs_kernel_mount
        !           330:  * Purpose:
        !           331:  *   Mount devfs at the given mount point from within the kernel.
        !           332:  */
        !           333: int
        !           334: devfs_kernel_mount(char * mntname)
        !           335: {
        !           336:        struct mount *mp;
        !           337:        int error;
        !           338:        struct proc *procp;
        !           339:        struct nameidata nd;
        !           340:        struct vnode  * vp;
        !           341: 
        !           342:        if (devfs_vfsp == NULL) {
        !           343:            printf("devfs_kernel_mount: devfs_vfsp is NULL\n");
        !           344:            return (EINVAL);
        !           345:        }
        !           346:        procp = current_proc();
        !           347: 
        !           348:        /*
        !           349:         * Get vnode to be covered
        !           350:         */
        !           351:        NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE,
        !           352:            mntname, procp);
        !           353:        if ((error = namei(&nd))) {
        !           354:            printf("devfs_kernel_mount: failed to find directory '%s', %d", 
        !           355:                   mntname, error);
        !           356:            return (error);
        !           357:        }
        !           358:        vp = nd.ni_vp;
        !           359:        if ((error = vinvalbuf(vp, V_SAVE, procp->p_ucred, procp, 0, 0))) {
        !           360:            printf("devfs_kernel_mount: vinval failed: %d\n", error);
        !           361:            vput(vp);
        !           362:            return (error);
        !           363:        }
        !           364:        if (vp->v_type != VDIR) {
        !           365:            printf("devfs_kernel_mount: '%s' is not a directory\n", mntname);
        !           366:            vput(vp);
        !           367:            return (ENOTDIR);
        !           368:        }
        !           369:        if (vp->v_mountedhere != NULL) {
        !           370:            vput(vp);
        !           371:            return (EBUSY);
        !           372:        }
        !           373: 
        !           374:        /*
        !           375:         * Allocate and initialize the filesystem.
        !           376:         */
        !           377:        mp = _MALLOC_ZONE((u_long)sizeof(struct mount), M_MOUNT, M_WAITOK);
        !           378:        lockinit(&mp->mnt_lock, PVFS, "vfslock", 0, 0);
        !           379:        (void)vfs_busy(mp, LK_NOWAIT, 0, procp);
        !           380:        LIST_INIT(&mp->mnt_vnodelist);
        !           381:        mp->mnt_op = devfs_vfsp->vfc_vfsops;
        !           382:        mp->mnt_vfc = devfs_vfsp;
        !           383:        devfs_vfsp->vfc_refcount++;
        !           384:        mp->mnt_flag = 0;
        !           385:        mp->mnt_flag |= devfs_vfsp->vfc_flags & MNT_VISFLAGMASK;
        !           386:        strncpy(mp->mnt_stat.f_fstypename, devfs_vfsp->vfc_name, MFSNAMELEN);
        !           387:        vp->v_mountedhere = mp;
        !           388:        mp->mnt_vnodecovered = vp;
        !           389:        mp->mnt_stat.f_owner = procp->p_ucred->cr_uid;
        !           390:        (void) copystr(mntname, mp->mnt_stat.f_mntonname, MNAMELEN - 1, 0);
        !           391: 
        !           392:        kernel_mount = 1;
        !           393:        error = devfs_mount(mp, mntname, NULL, NULL, procp);
        !           394:        kernel_mount = 0;
        !           395:        if (error) {
        !           396:            printf("devfs_kernel_mount: mount %s failed: %d", mntname, error);
        !           397:            mp->mnt_vfc->vfc_refcount--;
        !           398:            vfs_unbusy(mp, procp);
        !           399:            _FREE_ZONE(mp, sizeof (struct mount), M_MOUNT);
        !           400:            return (error);
        !           401:        }
        !           402:        printf("devfs on %s\n", mntname);
        !           403:        simple_lock(&mountlist_slock);
        !           404:        CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list);
        !           405:        simple_unlock(&mountlist_slock);
        !           406:        VOP_UNLOCK(vp, 0, procp);
        !           407:        vfs_unbusy(mp, procp);
        !           408:        return (0);
        !           409: }
        !           410: 
        !           411: struct vfsops devfs_vfsops = {
        !           412:        devfs_mount,
        !           413:        devfs_start,
        !           414:        devfs_unmount,
        !           415:        devfs_root,
        !           416:        devfs_quotactl,
        !           417:        devfs_statfs,
        !           418:        devfs_sync,
        !           419:        devfs_vget,
        !           420:        devfs_fhtovp,
        !           421:        devfs_vptofh,
        !           422:        devfs_init,
        !           423:        devfs_sysctl,
        !           424: };

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