Return to lfs_vfsops.c CVS log

Up to [Apple Darwin 0.x] / kernel / bsd / ufs / lfs

Annotation of kernel/bsd/ufs/lfs/lfs_vfsops.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
        !             3:  *
        !             4:  * @APPLE_LICENSE_HEADER_START@
        !             5:  * 
        !             6:  * Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
        !             7:  * Reserved.  This file contains Original Code and/or Modifications of
        !             8:  * Original Code as defined in and that are subject to the Apple Public
        !             9:  * Source License Version 1.1 (the "License").  You may not use this file
        !            10:  * except in compliance with the License.  Please obtain a copy of the
        !            11:  * License at http://www.apple.com/publicsource and read it before using
        !            12:  * this file.
        !            13:  * 
        !            14:  * The Original Code and all software distributed under the License are
        !            15:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
        !            16:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
        !            17:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
        !            18:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
        !            19:  * License for the specific language governing rights and limitations
        !            20:  * under the License.
        !            21:  * 
        !            22:  * @APPLE_LICENSE_HEADER_END@
        !            23:  */
        !            24: 
        !            25: /*     $NetBSD: lfs_vfsops.c,v 1.8 1995/03/09 12:06:10 mycroft Exp $   */
        !            26: 
        !            27: /*
        !            28:  * Copyright (c) 1989, 1991, 1993, 1994
        !            29:  *     The Regents of the University of California.  All rights reserved.
        !            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:  *     @(#)lfs_vfsops.c        8.10 (Berkeley) 11/21/94
        !            60:  */
        !            61: 
        !            62: #include <sys/param.h>
        !            63: #include <sys/systm.h>
        !            64: #include <sys/namei.h>
        !            65: #include <sys/proc.h>
        !            66: #include <sys/kernel.h>
        !            67: #include <sys/vnode.h>
        !            68: #include <sys/mount.h>
        !            69: #include <sys/buf.h>
        !            70: #include <sys/mbuf.h>
        !            71: #include <sys/file.h>
        !            72: #include <sys/disklabel.h>
        !            73: #include <sys/ioctl.h>
        !            74: #include <sys/errno.h>
        !            75: #include <sys/malloc.h>
        !            76: #include <sys/socket.h>
        !            77: 
        !            78: #include <miscfs/specfs/specdev.h>
        !            79: 
        !            80: #include <ufs/ufs/quota.h>
        !            81: #include <ufs/ufs/inode.h>
        !            82: #include <ufs/ufs/ufsmount.h>
        !            83: #include <ufs/ufs/ufs_extern.h>
        !            84: 
        !            85: #include <ufs/lfs/lfs.h>
        !            86: #include <ufs/lfs/lfs_extern.h>
        !            87: 
        !            88: int lfs_mountfs __P((struct vnode *, struct mount *, struct proc *));
        !            89: 
        !            90: struct vfsops lfs_vfsops = {
        !            91:        MOUNT_LFS,
        !            92:        lfs_mount,
        !            93:        ufs_start,
        !            94:        lfs_unmount,
        !            95:        ufs_root,
        !            96:        ufs_quotactl,
        !            97:        lfs_statfs,
        !            98:        lfs_sync,
        !            99:        lfs_vget,
        !           100:        lfs_fhtovp,
        !           101:        lfs_vptofh,
        !           102:        lfs_init,
        !           103: };
        !           104: 
        !           105: int
        !           106: lfs_mountroot()
        !           107: {
        !           108:        panic("lfs_mountroot");         /* XXX -- implement */
        !           109: }
        !           110: 
        !           111: /*
        !           112:  * VFS Operations.
        !           113:  *
        !           114:  * mount system call
        !           115:  */
        !           116: lfs_mount(mp, path, data, ndp, p)
        !           117:        register struct mount *mp;
        !           118:        char *path;
        !           119:        caddr_t data;
        !           120:        struct nameidata *ndp;
        !           121:        struct proc *p;
        !           122: {
        !           123:        struct vnode *devvp;
        !           124:        struct ufs_args args;
        !           125:        struct ufsmount *ump;
        !           126:        register struct lfs *fs;                                /* LFS */
        !           127:        size_t size;
        !           128:        int error;
        !           129:        mode_t accessmode;
        !           130: 
        !           131:        if (error = copyin(data, (caddr_t)&args, sizeof (struct ufs_args)))
        !           132:                return (error);
        !           133: 
        !           134:        /* Until LFS can do NFS right.          XXX */
        !           135:        if (args.export.ex_flags & MNT_EXPORTED)
        !           136:                return (EINVAL);
        !           137: 
        !           138:        /*
        !           139:         * If updating, check whether changing from read-only to
        !           140:         * read/write; if there is no device name, that's all we do.
        !           141:         */
        !           142:        if (mp->mnt_flag & MNT_UPDATE) {
        !           143:                ump = VFSTOUFS(mp);
        !           144:                if (fs->lfs_ronly && (mp->mnt_flag & MNT_WANTRDWR)) {
        !           145:                        /*
        !           146:                         * If upgrade to read-write by non-root, then verify
        !           147:                         * that user has necessary permissions on the device.
        !           148:                         */
        !           149:                        if (p->p_ucred->cr_uid != 0) {
        !           150:                                VOP_LOCK(ump->um_devvp);
        !           151:                                if (error = VOP_ACCESS(ump->um_devvp,
        !           152:                                    VREAD | VWRITE, p->p_ucred, p)) {
        !           153:                                        VOP_UNLOCK(ump->um_devvp);
        !           154:                                        return (error);
        !           155:                                }
        !           156:                                VOP_UNLOCK(ump->um_devvp);
        !           157:                        }
        !           158:                        fs->lfs_ronly = 0;
        !           159:                }
        !           160:                if (args.fspec == 0) {
        !           161:                        /*
        !           162:                         * Process export requests.
        !           163:                         */
        !           164:                        return (vfs_export(mp, &ump->um_export, &args.export));
        !           165:                }
        !           166:        }
        !           167:        /*
        !           168:         * Not an update, or updating the name: look up the name
        !           169:         * and verify that it refers to a sensible block device.
        !           170:         */
        !           171:        NDINIT(ndp, LOOKUP, FOLLOW, UIO_USERSPACE, args.fspec, p);
        !           172:        if (error = namei(ndp))
        !           173:                return (error);
        !           174:        devvp = ndp->ni_vp;
        !           175:        if (devvp->v_type != VBLK) {
        !           176:                vrele(devvp);
        !           177:                return (ENOTBLK);
        !           178:        }
        !           179:        if (major(devvp->v_rdev) >= nblkdev) {
        !           180:                vrele(devvp);
        !           181:                return (ENXIO);
        !           182:        }
        !           183:        /*
        !           184:         * If mount by non-root, then verify that user has necessary
        !           185:         * permissions on the device.
        !           186:         */
        !           187:        if (p->p_ucred->cr_uid != 0) {
        !           188:                accessmode = VREAD;
        !           189:                if ((mp->mnt_flag & MNT_RDONLY) == 0)
        !           190:                        accessmode |= VWRITE;
        !           191:                VOP_LOCK(devvp);
        !           192:                if (error = VOP_ACCESS(devvp, accessmode, p->p_ucred, p)) {
        !           193:                        vput(devvp);
        !           194:                        return (error);
        !           195:                }
        !           196:                VOP_UNLOCK(devvp);
        !           197:        }
        !           198:        if ((mp->mnt_flag & MNT_UPDATE) == 0)
        !           199:                error = lfs_mountfs(devvp, mp, p);              /* LFS */
        !           200:        else {
        !           201:                if (devvp != ump->um_devvp)
        !           202:                        error = EINVAL; /* needs translation */
        !           203:                else
        !           204:                        vrele(devvp);
        !           205:        }
        !           206:        if (error) {
        !           207:                vrele(devvp);
        !           208:                return (error);
        !           209:        }
        !           210:        ump = VFSTOUFS(mp);
        !           211:        fs = ump->um_lfs;                                       /* LFS */
        !           212: #ifdef NOTLFS                                                  /* LFS */
        !           213:        (void) copyinstr(path, fs->fs_fsmnt, sizeof(fs->fs_fsmnt) - 1, &size);
        !           214:        bzero(fs->fs_fsmnt + size, sizeof(fs->fs_fsmnt) - size);
        !           215:        bcopy(fs->fs_fsmnt, mp->mnt_stat.f_mntonname, MNAMELEN);
        !           216: #else
        !           217:        (void)copyinstr(path, fs->lfs_fsmnt, sizeof(fs->lfs_fsmnt) - 1, &size);
        !           218:        bzero(fs->lfs_fsmnt + size, sizeof(fs->lfs_fsmnt) - size);
        !           219:        bcopy(fs->lfs_fsmnt, mp->mnt_stat.f_mntonname, MNAMELEN);
        !           220: #endif
        !           221:        (void) copyinstr(args.fspec, mp->mnt_stat.f_mntfromname, MNAMELEN - 1,
        !           222:            &size);
        !           223:        bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
        !           224:        return (0);
        !           225: }
        !           226: 
        !           227: /*
        !           228:  * Common code for mount and mountroot
        !           229:  * LFS specific
        !           230:  */
        !           231: int
        !           232: lfs_mountfs(devvp, mp, p)
        !           233:        register struct vnode *devvp;
        !           234:        struct mount *mp;
        !           235:        struct proc *p;
        !           236: {
        !           237:        extern struct vnode *rootvp;
        !           238:        register struct lfs *fs;
        !           239:        register struct ufsmount *ump;
        !           240:        struct vnode *vp;
        !           241:        struct buf *bp;
        !           242:        struct partinfo dpart;
        !           243:        dev_t dev;
        !           244:        int error, i, ronly, size;
        !           245:        struct ucred *cred;
        !           246: 
        !           247:        cred = p ? p->p_ucred : NOCRED;
        !           248:        /*
        !           249:         * Disallow multiple mounts of the same device.
        !           250:         * Disallow mounting of a device that is currently in use
        !           251:         * (except for root, which might share swap device for miniroot).
        !           252:         * Flush out any old buffers remaining from a previous use.
        !           253:         */
        !           254:        if (error = vfs_mountedon(devvp))
        !           255:                return (error);
        !           256:        if (vcount(devvp) > 1 && devvp != rootvp)
        !           257:                return (EBUSY);
        !           258:        if (error = vinvalbuf(devvp, V_SAVE, cred, p, 0, 0))
        !           259:                return (error);
        !           260: 
        !           261:        ronly = (mp->mnt_flag & MNT_RDONLY) != 0;
        !           262:        if (error = VOP_OPEN(devvp, ronly ? FREAD : FREAD|FWRITE, FSCRED, p))
        !           263:                return (error);
        !           264: 
        !           265:        if (VOP_IOCTL(devvp, DIOCGPART, (caddr_t)&dpart, FREAD, cred, p) != 0)
        !           266:                size = DEV_BSIZE;
        !           267:        else {
        !           268:                size = dpart.disklab->d_secsize;
        !           269: #ifdef NEVER_USED
        !           270:                dpart.part->p_fstype = FS_LFS;
        !           271:                dpart.part->p_fsize = fs->lfs_fsize;    /* frag size */
        !           272:                dpart.part->p_frag = fs->lfs_frag;      /* frags per block */
        !           273:                dpart.part->p_cpg = fs->lfs_segshift;   /* segment shift */
        !           274: #endif
        !           275:        }
        !           276: 
        !           277:        /* Don't free random space on error. */
        !           278:        bp = NULL;
        !           279:        ump = NULL;
        !           280: 
        !           281:        /* Read in the superblock. */
        !           282:        if (error = bread(devvp, LFS_LABELPAD / size, LFS_SBPAD, cred, &bp))
        !           283:                goto out;
        !           284:        fs = (struct lfs *)bp->b_data;
        !           285: 
        !           286:        /* Check the basics. */
        !           287:        if (fs->lfs_magic != LFS_MAGIC || fs->lfs_bsize > MAXBSIZE ||
        !           288:            fs->lfs_bsize < sizeof(struct lfs)) {
        !           289:                error = EINVAL;         /* XXX needs translation */
        !           290:                goto out;
        !           291:        }
        !           292: 
        !           293:        /* Allocate the mount structure, copy the superblock into it. */
        !           294: //     ump = (struct ufsmount *)malloc(sizeof *ump, M_UFSMNT, M_WAITOK);
        !           295: //     fs = ump->um_lfs = malloc(sizeof(struct lfs), M_UFSMNT, M_WAITOK);
        !           296:        MALLOC(ump, struct ufsmount *, sizeof(struct ufsmount), M_UFSMNT, M_WAITOK);
        !           297:        MALLOC(ump->um_lfs, struct lfs *, sizeof(struct lfs), M_UFSMNT, M_WAITOK);
        !           298:        fs = ump->um_lfs;
        !           299:        bcopy(bp->b_data, fs, sizeof(struct lfs));
        !           300:        if (sizeof(struct lfs) < LFS_SBPAD)                     /* XXX why? */
        !           301:                bp->b_flags |= B_INVAL;
        !           302:        brelse(bp);
        !           303:        bp = NULL;
        !           304: 
        !           305:        /* Set up the I/O information */
        !           306:        fs->lfs_iocount = 0;
        !           307: 
        !           308:        /* Set up the ifile and lock aflags */
        !           309:        fs->lfs_doifile = 0;
        !           310:        fs->lfs_writer = 0;
        !           311:        fs->lfs_dirops = 0;
        !           312:        fs->lfs_seglock = 0;
        !           313: 
        !           314:        /* Set the file system readonly/modify bits. */
        !           315:        fs->lfs_ronly = ronly;
        !           316:        if (ronly == 0)
        !           317:                fs->lfs_fmod = 1;
        !           318: 
        !           319:        /* Initialize the mount structure. */
        !           320:        dev = devvp->v_rdev;
        !           321:        mp->mnt_data = (qaddr_t)ump;
        !           322:        mp->mnt_stat.f_fsid.val[0] = (long)dev;
        !           323:        mp->mnt_stat.f_fsid.val[1] = makefstype(MOUNT_LFS);
        !           324:        mp->mnt_maxsymlinklen = fs->lfs_maxsymlinklen;
        !           325:        mp->mnt_flag |= MNT_LOCAL;
        !           326:        ump->um_mountp = mp;
        !           327:        ump->um_dev = dev;
        !           328:        ump->um_devvp = devvp;
        !           329:        ump->um_bptrtodb = 0;
        !           330:        ump->um_seqinc = 1 << fs->lfs_fsbtodb;
        !           331:        ump->um_nindir = fs->lfs_nindir;
        !           332:        for (i = 0; i < MAXQUOTAS; i++)
        !           333:                ump->um_quotas[i] = NULLVP;
        !           334:        devvp->v_specflags |= SI_MOUNTEDON;
        !           335: 
        !           336:        /*
        !           337:         * We use the ifile vnode for almost every operation.  Instead of
        !           338:         * retrieving it from the hash table each time we retrieve it here,
        !           339:         * artificially increment the reference count and keep a pointer
        !           340:         * to it in the incore copy of the superblock.
        !           341:         */
        !           342:        if (error = VFS_VGET(mp, LFS_IFILE_INUM, &vp))
        !           343:                goto out;
        !           344:        fs->lfs_ivnode = vp;
        !           345:        VREF(vp);
        !           346:        vput(vp);
        !           347: 
        !           348:        return (0);
        !           349: out:
        !           350:        if (bp)
        !           351:                brelse(bp);
        !           352:        (void)VOP_CLOSE(devvp, ronly ? FREAD : FREAD|FWRITE, cred, p);
        !           353:        if (ump) {
        !           354:                free(ump->um_lfs, M_UFSMNT);
        !           355:                free(ump, M_UFSMNT);
        !           356:                mp->mnt_data = (qaddr_t)0;
        !           357:        }
        !           358:        return (error);
        !           359: }
        !           360: 
        !           361: /*
        !           362:  * unmount system call
        !           363:  */
        !           364: lfs_unmount(mp, mntflags, p)
        !           365:        struct mount *mp;
        !           366:        int mntflags;
        !           367:        struct proc *p;
        !           368: {
        !           369:        extern int doforce;
        !           370:        register struct ufsmount *ump;
        !           371:        register struct lfs *fs;
        !           372:        int i, error, flags, ronly;
        !           373: 
        !           374:        flags = 0;
        !           375:        if (mntflags & MNT_FORCE)
        !           376:                flags |= FORCECLOSE;
        !           377: 
        !           378:        ump = VFSTOUFS(mp);
        !           379:        fs = ump->um_lfs;
        !           380: #ifdef QUOTA
        !           381:        if (mp->mnt_flag & MNT_QUOTA) {
        !           382:                if (error = vflush(mp, fs->lfs_ivnode, SKIPSYSTEM|flags))
        !           383:                        return (error);
        !           384:                for (i = 0; i < MAXQUOTAS; i++) {
        !           385:                        if (ump->um_quotas[i] == NULLVP)
        !           386:                                continue;
        !           387:                        quotaoff(p, mp, i);
        !           388:                }
        !           389:                /*
        !           390:                 * Here we fall through to vflush again to ensure
        !           391:                 * that we have gotten rid of all the system vnodes.
        !           392:                 */
        !           393:        }
        !           394: #endif
        !           395:        if (error = vflush(mp, fs->lfs_ivnode, flags))
        !           396:                return (error);
        !           397:        fs->lfs_clean = 1;
        !           398:        if (error = VFS_SYNC(mp, 1, p->p_ucred, p))
        !           399:                return (error);
        !           400:        if (fs->lfs_ivnode->v_dirtyblkhd.lh_first)
        !           401:                panic("lfs_unmount: still dirty blocks on ifile vnode\n");
        !           402:        vrele(fs->lfs_ivnode);
        !           403:        vgone(fs->lfs_ivnode);
        !           404: 
        !           405:        ronly = !fs->lfs_ronly;
        !           406:        ump->um_devvp->v_specflags &= ~SI_MOUNTEDON;
        !           407:        error = VOP_CLOSE(ump->um_devvp,
        !           408:            ronly ? FREAD : FREAD|FWRITE, NOCRED, p);
        !           409:        vrele(ump->um_devvp);
        !           410:        free(fs, M_UFSMNT);
        !           411:        free(ump, M_UFSMNT);
        !           412:        mp->mnt_data = (qaddr_t)0;
        !           413:        mp->mnt_flag &= ~MNT_LOCAL;
        !           414:        return (error);
        !           415: }
        !           416: 
        !           417: /*
        !           418:  * Get file system statistics.
        !           419:  */
        !           420: lfs_statfs(mp, sbp, p)
        !           421:        struct mount *mp;
        !           422:        register struct statfs *sbp;
        !           423:        struct proc *p;
        !           424: {
        !           425:        register struct lfs *fs;
        !           426:        register struct ufsmount *ump;
        !           427: 
        !           428:        ump = VFSTOUFS(mp);
        !           429:        fs = ump->um_lfs;
        !           430:        if (fs->lfs_magic != LFS_MAGIC)
        !           431:                panic("lfs_statfs: magic");
        !           432:        sbp->f_type = 0;
        !           433:        sbp->f_bsize = fs->lfs_bsize;
        !           434:        sbp->f_iosize = fs->lfs_bsize;
        !           435:        sbp->f_blocks = dbtofsb(fs,fs->lfs_dsize);
        !           436:        sbp->f_bfree = dbtofsb(fs, fs->lfs_bfree);
        !           437:        sbp->f_bavail = (fs->lfs_dsize * (100 - fs->lfs_minfree) / 100) -
        !           438:                (fs->lfs_dsize - fs->lfs_bfree);
        !           439:        sbp->f_bavail = dbtofsb(fs, sbp->f_bavail);
        !           440:        sbp->f_files = fs->lfs_nfiles;
        !           441:        sbp->f_ffree = sbp->f_bfree * INOPB(fs);
        !           442:        if (sbp != &mp->mnt_stat) {
        !           443:                bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN);
        !           444:                bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN);
        !           445:        }
        !           446:        strncpy(sbp->f_fstypename, mp->mnt_op->vfs_name, MFSNAMELEN);
        !           447:        sbp->f_fstypename[MFSNAMELEN] = '\0';
        !           448:        return (0);
        !           449: }
        !           450: 
        !           451: /*
        !           452:  * Go through the disk queues to initiate sandbagged IO;
        !           453:  * go through the inodes to write those that have been modified;
        !           454:  * initiate the writing of the super block if it has been modified.
        !           455:  *
        !           456:  * Note: we are always called with the filesystem marked `MPBUSY'.
        !           457:  */
        !           458: lfs_sync(mp, waitfor, cred, p)
        !           459:        struct mount *mp;
        !           460:        int waitfor;
        !           461:        struct ucred *cred;
        !           462:        struct proc *p;
        !           463: {
        !           464:        int error;
        !           465: 
        !           466:        /* All syncs must be checkpoints until roll-forward is implemented. */
        !           467:        error = lfs_segwrite(mp, SEGM_CKP | (waitfor ? SEGM_SYNC : 0));
        !           468: #ifdef QUOTA
        !           469:        qsync(mp);
        !           470: #endif
        !           471:        return (error);
        !           472: }
        !           473: 
        !           474: /*
        !           475:  * Look up an LFS dinode number to find its incore vnode.  If not already
        !           476:  * in core, read it in from the specified device.  Return the inode locked.
        !           477:  * Detection and handling of mount points must be done by the calling routine.
        !           478:  */
        !           479: int
        !           480: lfs_vget(mp, ino, vpp)
        !           481:        struct mount *mp;
        !           482:        ino_t ino;
        !           483:        struct vnode **vpp;
        !           484: {
        !           485:        register struct lfs *fs;
        !           486:        register struct inode *ip;
        !           487:        struct buf *bp;
        !           488:        struct ifile *ifp;
        !           489:        struct vnode *vp;
        !           490:        struct ufsmount *ump;
        !           491:        daddr_t daddr;
        !           492:        dev_t dev;
        !           493:        int error;
        !           494: 
        !           495:        ump = VFSTOUFS(mp);
        !           496:        dev = ump->um_dev;
        !           497:        if ((*vpp = ufs_ihashget(dev, ino)) != NULL)
        !           498:                return (0);
        !           499: 
        !           500:        /* Translate the inode number to a disk address. */
        !           501:        fs = ump->um_lfs;
        !           502:        if (ino == LFS_IFILE_INUM)
        !           503:                daddr = fs->lfs_idaddr;
        !           504:        else {
        !           505:                LFS_IENTRY(ifp, fs, ino, bp);
        !           506:                daddr = ifp->if_daddr;
        !           507:                brelse(bp);
        !           508:                if (daddr == LFS_UNUSED_DADDR)
        !           509:                        return (ENOENT);
        !           510:        }
        !           511: 
        !           512:        /* Allocate new vnode/inode. */
        !           513:        if (error = lfs_vcreate(mp, ino, &vp)) {
        !           514:                *vpp = NULL;
        !           515:                return (error);
        !           516:        }
        !           517: 
        !           518:        /*
        !           519:         * Put it onto its hash chain and lock it so that other requests for
        !           520:         * this inode will block if they arrive while we are sleeping waiting
        !           521:         * for old data structures to be purged or for the contents of the
        !           522:         * disk portion of this inode to be read.
        !           523:         */
        !           524:        ip = VTOI(vp);
        !           525:        ufs_ihashins(ip);
        !           526: 
        !           527:        /*
        !           528:         * XXX
        !           529:         * This may not need to be here, logically it should go down with
        !           530:         * the i_devvp initialization.
        !           531:         * Ask Kirk.
        !           532:         */
        !           533:        ip->i_lfs = ump->um_lfs;
        !           534: 
        !           535:        /* Read in the disk contents for the inode, copy into the inode. */
        !           536:        if (error =
        !           537:            bread(ump->um_devvp, daddr, (int)fs->lfs_bsize, NOCRED, &bp)) {
        !           538:                /*
        !           539:                 * The inode does not contain anything useful, so it would
        !           540:                 * be misleading to leave it on its hash chain. With mode
        !           541:                 * still zero, it will be unlinked and returned to the free
        !           542:                 * list by vput().
        !           543:                 */
        !           544:                vput(vp);
        !           545:                brelse(bp);
        !           546:                *vpp = NULL;
        !           547:                return (error);
        !           548:        }
        !           549:        ip->i_din = *lfs_ifind(fs, ino, (struct dinode *)bp->b_data);
        !           550:        brelse(bp);
        !           551: 
        !           552:        /*
        !           553:         * Initialize the vnode from the inode, check for aliases.  In all
        !           554:         * cases re-init ip, the underlying vnode/inode may have changed.
        !           555:         */
        !           556:        if (error = ufs_vinit(mp, lfs_specop_p, LFS_FIFOOPS, &vp)) {
        !           557:                vput(vp);
        !           558:                *vpp = NULL;
        !           559:                return (error);
        !           560:        }
        !           561:        /*
        !           562:         * Finish inode initialization now that aliasing has been resolved.
        !           563:         */
        !           564:        ip->i_devvp = ump->um_devvp;
        !           565:        VREF(ip->i_devvp);
        !           566:        *vpp = vp;
        !           567:        return (0);
        !           568: }
        !           569: 
        !           570: /*
        !           571:  * File handle to vnode
        !           572:  *
        !           573:  * Have to be really careful about stale file handles:
        !           574:  * - check that the inode number is valid
        !           575:  * - call lfs_vget() to get the locked inode
        !           576:  * - check for an unallocated inode (i_mode == 0)
        !           577:  * - check that the given client host has export rights and return
        !           578:  *   those rights via. exflagsp and credanonp
        !           579:  *
        !           580:  * XXX
        !           581:  * use ifile to see if inode is allocated instead of reading off disk
        !           582:  * what is the relationship between my generational number and the NFS
        !           583:  * generational number.
        !           584:  */
        !           585: int
        !           586: lfs_fhtovp(mp, fhp, nam, vpp, exflagsp, credanonp)
        !           587:        register struct mount *mp;
        !           588:        struct fid *fhp;
        !           589:        struct mbuf *nam;
        !           590:        struct vnode **vpp;
        !           591:        int *exflagsp;
        !           592:        struct ucred **credanonp;
        !           593: {
        !           594:        register struct ufid *ufhp;
        !           595: 
        !           596:        ufhp = (struct ufid *)fhp;
        !           597:        if (ufhp->ufid_ino < ROOTINO)
        !           598:                return (ESTALE);
        !           599:        return (ufs_check_export(mp, ufhp, nam, vpp, exflagsp, credanonp));
        !           600: }
        !           601: 
        !           602: /*
        !           603:  * Vnode pointer to File handle
        !           604:  */
        !           605: /* ARGSUSED */
        !           606: lfs_vptofh(vp, fhp)
        !           607:        struct vnode *vp;
        !           608:        struct fid *fhp;
        !           609: {
        !           610:        register struct inode *ip;
        !           611:        register struct ufid *ufhp;
        !           612: 
        !           613:        ip = VTOI(vp);
        !           614:        ufhp = (struct ufid *)fhp;
        !           615:        ufhp->ufid_len = sizeof(struct ufid);
        !           616:        ufhp->ufid_ino = ip->i_number;
        !           617:        ufhp->ufid_gen = ip->i_gen;
        !           618:        return (0);
        !           619: }

This archive runs on limited infrastructure. Preserving old code on modern bandwidth. Automated agents are requested to crawl responsibly.