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Annotation of src/sys/fs/msdosfs/msdosfs_vfsops.c, Revision 1.13.2.2

1.13.2.2! he          1: /*     $NetBSD: msdosfs_vfsops.c,v 1.13.2.1 2004/05/29 09:03:48 tron Exp $     */
1.1       jdolecek    2:
                      3: /*-
                      4:  * Copyright (C) 1994, 1995, 1997 Wolfgang Solfrank.
                      5:  * Copyright (C) 1994, 1995, 1997 TooLs GmbH.
                      6:  * All rights reserved.
                      7:  * Original code by Paul Popelka (paulp@uts.amdahl.com) (see below).
                      8:  *
                      9:  * Redistribution and use in source and binary forms, with or without
                     10:  * modification, are permitted provided that the following conditions
                     11:  * are met:
                     12:  * 1. Redistributions of source code must retain the above copyright
                     13:  *    notice, this list of conditions and the following disclaimer.
                     14:  * 2. Redistributions in binary form must reproduce the above copyright
                     15:  *    notice, this list of conditions and the following disclaimer in the
                     16:  *    documentation and/or other materials provided with the distribution.
                     17:  * 3. All advertising materials mentioning features or use of this software
                     18:  *    must display the following acknowledgement:
                     19:  *     This product includes software developed by TooLs GmbH.
                     20:  * 4. The name of TooLs GmbH may not be used to endorse or promote products
                     21:  *    derived from this software without specific prior written permission.
                     22:  *
                     23:  * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR
                     24:  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
                     25:  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
                     26:  * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
                     27:  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
                     28:  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
                     29:  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
                     30:  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
                     31:  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
                     32:  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
                     33:  */
                     34: /*
                     35:  * Written by Paul Popelka (paulp@uts.amdahl.com)
                     36:  *
                     37:  * You can do anything you want with this software, just don't say you wrote
                     38:  * it, and don't remove this notice.
                     39:  *
                     40:  * This software is provided "as is".
                     41:  *
                     42:  * The author supplies this software to be publicly redistributed on the
                     43:  * understanding that the author is not responsible for the correct
                     44:  * functioning of this software in any circumstances and is not liable for
                     45:  * any damages caused by this software.
                     46:  *
                     47:  * October 1992
                     48:  */
                     49:
                     50: #include <sys/cdefs.h>
1.13.2.2! he         51: __KERNEL_RCSID(0, "$NetBSD: msdosfs_vfsops.c,v 1.13.2.1 2004/05/29 09:03:48 tron Exp $");
1.1       jdolecek   52:
                     53: #if defined(_KERNEL_OPT)
                     54: #include "opt_quota.h"
                     55: #include "opt_compat_netbsd.h"
                     56: #endif
                     57:
                     58: #include <sys/param.h>
                     59: #include <sys/systm.h>
1.12      atatat     60: #include <sys/sysctl.h>
1.1       jdolecek   61: #include <sys/namei.h>
                     62: #include <sys/proc.h>
                     63: #include <sys/kernel.h>
                     64: #include <sys/vnode.h>
                     65: #include <miscfs/specfs/specdev.h> /* XXX */   /* defines v_rdev */
                     66: #include <sys/mount.h>
                     67: #include <sys/buf.h>
                     68: #include <sys/file.h>
                     69: #include <sys/device.h>
                     70: #include <sys/disklabel.h>
                     71: #include <sys/ioctl.h>
                     72: #include <sys/malloc.h>
                     73: #include <sys/dirent.h>
                     74: #include <sys/stat.h>
                     75: #include <sys/conf.h>
                     76:
                     77: #include <fs/msdosfs/bpb.h>
                     78: #include <fs/msdosfs/bootsect.h>
                     79: #include <fs/msdosfs/direntry.h>
                     80: #include <fs/msdosfs/denode.h>
                     81: #include <fs/msdosfs/msdosfsmount.h>
                     82: #include <fs/msdosfs/fat.h>
                     83:
                     84: int msdosfs_mountroot __P((void));
                     85: int msdosfs_mount __P((struct mount *, const char *, void *,
1.7       fvdl       86:     struct nameidata *, struct proc *));
                     87: int msdosfs_start __P((struct mount *, int, struct proc *));
                     88: int msdosfs_unmount __P((struct mount *, int, struct proc *));
1.6       thorpej    89: int msdosfs_root __P((struct mount *, struct vnode **));
1.7       fvdl       90: int msdosfs_quotactl __P((struct mount *, int, uid_t, caddr_t, struct proc *));
                     91: int msdosfs_statfs __P((struct mount *, struct statfs *, struct proc *));
                     92: int msdosfs_sync __P((struct mount *, int, struct ucred *, struct proc *));
1.6       thorpej    93: int msdosfs_vget __P((struct mount *, ino_t, struct vnode **));
                     94: int msdosfs_fhtovp __P((struct mount *, struct fid *, struct vnode **));
1.1       jdolecek   95: int msdosfs_checkexp __P((struct mount *, struct mbuf *, int *,
                     96:     struct ucred **));
                     97: int msdosfs_vptofh __P((struct vnode *, struct fid *));
                     98:
1.7       fvdl       99: int msdosfs_mountfs __P((struct vnode *, struct mount *, struct proc *,
1.1       jdolecek  100:     struct msdosfs_args *));
                    101:
1.6       thorpej   102: static int update_mp __P((struct mount *, struct msdosfs_args *));
1.2       thorpej   103:
                    104: MALLOC_DEFINE(M_MSDOSFSMNT, "MSDOSFS mount", "MSDOS FS mount structure");
                    105: MALLOC_DEFINE(M_MSDOSFSFAT, "MSDOSFS fat", "MSDOS FS fat table");
1.1       jdolecek  106:
                    107: #define ROOTNAME "root_device"
                    108:
                    109: extern const struct vnodeopv_desc msdosfs_vnodeop_opv_desc;
                    110:
                    111: const struct vnodeopv_desc * const msdosfs_vnodeopv_descs[] = {
                    112:        &msdosfs_vnodeop_opv_desc,
                    113:        NULL,
                    114: };
                    115:
                    116: struct vfsops msdosfs_vfsops = {
                    117:        MOUNT_MSDOS,
                    118:        msdosfs_mount,
                    119:        msdosfs_start,
                    120:        msdosfs_unmount,
                    121:        msdosfs_root,
                    122:        msdosfs_quotactl,
                    123:        msdosfs_statfs,
                    124:        msdosfs_sync,
                    125:        msdosfs_vget,
                    126:        msdosfs_fhtovp,
                    127:        msdosfs_vptofh,
                    128:        msdosfs_init,
                    129:        msdosfs_reinit,
                    130:        msdosfs_done,
1.12      atatat    131:        NULL,
1.1       jdolecek  132:        msdosfs_mountroot,
                    133:        msdosfs_checkexp,
                    134:        msdosfs_vnodeopv_descs,
                    135: };
                    136:
                    137: static int
1.6       thorpej   138: update_mp(mp, argp)
1.1       jdolecek  139:        struct mount *mp;
                    140:        struct msdosfs_args *argp;
                    141: {
                    142:        struct msdosfsmount *pmp = VFSTOMSDOSFS(mp);
                    143:        int error;
                    144:
                    145:        pmp->pm_gid = argp->gid;
                    146:        pmp->pm_uid = argp->uid;
                    147:        pmp->pm_mask = argp->mask & ALLPERMS;
1.8       jdolecek  148:        pmp->pm_dirmask = argp->dirmask & ALLPERMS;
1.9       itojun    149:        pmp->pm_gmtoff = argp->gmtoff;
1.1       jdolecek  150:        pmp->pm_flags |= argp->flags & MSDOSFSMNT_MNTOPT;
                    151:
                    152:        /*
                    153:         * GEMDOS knows nothing (yet) about win95
                    154:         */
                    155:        if (pmp->pm_flags & MSDOSFSMNT_GEMDOSFS)
                    156:                pmp->pm_flags |= MSDOSFSMNT_NOWIN95;
                    157:
                    158:        if (pmp->pm_flags & MSDOSFSMNT_NOWIN95)
                    159:                pmp->pm_flags |= MSDOSFSMNT_SHORTNAME;
                    160:        else if (!(pmp->pm_flags &
                    161:            (MSDOSFSMNT_SHORTNAME | MSDOSFSMNT_LONGNAME))) {
                    162:                struct vnode *rootvp;
                    163:
                    164:                /*
                    165:                 * Try to divine whether to support Win'95 long filenames
                    166:                 */
                    167:                if (FAT32(pmp))
                    168:                        pmp->pm_flags |= MSDOSFSMNT_LONGNAME;
                    169:                else {
1.6       thorpej   170:                        if ((error = msdosfs_root(mp, &rootvp)) != 0)
1.1       jdolecek  171:                                return error;
                    172:                        pmp->pm_flags |= findwin95(VTODE(rootvp))
                    173:                                ? MSDOSFSMNT_LONGNAME
                    174:                                        : MSDOSFSMNT_SHORTNAME;
                    175:                        vput(rootvp);
                    176:                }
                    177:        }
                    178:        return 0;
                    179: }
                    180:
                    181: int
                    182: msdosfs_mountroot()
                    183: {
                    184:        struct mount *mp;
1.7       fvdl      185:        struct proc *p = curproc;       /* XXX */
1.1       jdolecek  186:        int error;
                    187:        struct msdosfs_args args;
                    188:
                    189:        if (root_device->dv_class != DV_DISK)
                    190:                return (ENODEV);
                    191:
                    192:        /*
                    193:         * Get vnodes for swapdev and rootdev.
                    194:         */
                    195:        if (bdevvp(rootdev, &rootvp))
                    196:                panic("msdosfs_mountroot: can't setup rootvp");
                    197:
                    198:        if ((error = vfs_rootmountalloc(MOUNT_MSDOS, "root_device", &mp))) {
                    199:                vrele(rootvp);
                    200:                return (error);
                    201:        }
                    202:
1.8       jdolecek  203:        args.flags = MSDOSFSMNT_VERSIONED;
1.1       jdolecek  204:        args.uid = 0;
                    205:        args.gid = 0;
                    206:        args.mask = 0777;
1.8       jdolecek  207:        args.version = MSDOSFSMNT_VERSION;
                    208:        args.dirmask = 0777;
1.1       jdolecek  209:
1.7       fvdl      210:        if ((error = msdosfs_mountfs(rootvp, mp, p, &args)) != 0) {
1.1       jdolecek  211:                mp->mnt_op->vfs_refcount--;
                    212:                vfs_unbusy(mp);
                    213:                free(mp, M_MOUNT);
                    214:                vrele(rootvp);
                    215:                return (error);
                    216:        }
                    217:
1.6       thorpej   218:        if ((error = update_mp(mp, &args)) != 0) {
1.7       fvdl      219:                (void)msdosfs_unmount(mp, 0, p);
1.1       jdolecek  220:                vfs_unbusy(mp);
                    221:                free(mp, M_MOUNT);
                    222:                vrele(rootvp);
                    223:                return (error);
                    224:        }
                    225:
                    226:        simple_lock(&mountlist_slock);
                    227:        CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list);
                    228:        simple_unlock(&mountlist_slock);
1.7       fvdl      229:        (void)msdosfs_statfs(mp, &mp->mnt_stat, p);
1.1       jdolecek  230:        vfs_unbusy(mp);
                    231:        return (0);
                    232: }
                    233:
                    234: /*
                    235:  * mp - path - addr in user space of mount point (ie /usr or whatever)
                    236:  * data - addr in user space of mount params including the name of the block
                    237:  * special file to treat as a filesystem.
                    238:  */
                    239: int
1.7       fvdl      240: msdosfs_mount(mp, path, data, ndp, p)
1.1       jdolecek  241:        struct mount *mp;
                    242:        const char *path;
                    243:        void *data;
                    244:        struct nameidata *ndp;
1.7       fvdl      245:        struct proc *p;
1.1       jdolecek  246: {
                    247:        struct vnode *devvp;      /* vnode for blk device to mount */
                    248:        struct msdosfs_args args; /* will hold data from mount request */
                    249:        /* msdosfs specific mount control block */
                    250:        struct msdosfsmount *pmp = NULL;
                    251:        int error, flags;
                    252:        mode_t accessmode;
                    253:
                    254:        if (mp->mnt_flag & MNT_GETARGS) {
                    255:                pmp = VFSTOMSDOSFS(mp);
                    256:                if (pmp == NULL)
                    257:                        return EIO;
                    258:                args.fspec = NULL;
                    259:                args.uid = pmp->pm_uid;
                    260:                args.gid = pmp->pm_gid;
                    261:                args.mask = pmp->pm_mask;
                    262:                args.flags = pmp->pm_flags;
1.8       jdolecek  263:                args.version = MSDOSFSMNT_VERSION;
                    264:                args.dirmask = pmp->pm_dirmask;
1.13.2.2! he        265:                args.gmtoff = pmp->pm_gmtoff;
1.1       jdolecek  266:                vfs_showexport(mp, &args.export, &pmp->pm_export);
                    267:                return copyout(&args, data, sizeof(args));
                    268:        }
1.3       dsl       269:        error = copyin(data, &args, sizeof(struct msdosfs_args));
1.1       jdolecek  270:        if (error)
                    271:                return (error);
1.8       jdolecek  272:
                    273:        /*
                    274:         * If not versioned (i.e. using old mount_msdos(8)), fill in
                    275:         * the additional structure items with suitable defaults.
                    276:         */
                    277:        if ((args.flags & MSDOSFSMNT_VERSIONED) == 0) {
                    278:                args.version = 1;
                    279:                args.dirmask = args.mask;
                    280:        }
                    281:
1.1       jdolecek  282:        /*
                    283:         * If updating, check whether changing from read-only to
                    284:         * read/write; if there is no device name, that's all we do.
                    285:         */
                    286:        if (mp->mnt_flag & MNT_UPDATE) {
                    287:                pmp = VFSTOMSDOSFS(mp);
                    288:                error = 0;
                    289:                if (!(pmp->pm_flags & MSDOSFSMNT_RONLY) && (mp->mnt_flag & MNT_RDONLY)) {
                    290:                        flags = WRITECLOSE;
                    291:                        if (mp->mnt_flag & MNT_FORCE)
                    292:                                flags |= FORCECLOSE;
                    293:                        error = vflush(mp, NULLVP, flags);
                    294:                }
                    295:                if (!error && (mp->mnt_flag & MNT_RELOAD))
                    296:                        /* not yet implemented */
                    297:                        error = EOPNOTSUPP;
                    298:                if (error)
                    299:                        return (error);
1.11      dbj       300:                if ((pmp->pm_flags & MSDOSFSMNT_RONLY) && (mp->mnt_iflag & IMNT_WANTRDWR)) {
1.1       jdolecek  301:                        /*
                    302:                         * If upgrade to read-write by non-root, then verify
                    303:                         * that user has necessary permissions on the device.
                    304:                         */
                    305:                        if (p->p_ucred->cr_uid != 0) {
                    306:                                devvp = pmp->pm_devvp;
                    307:                                vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
                    308:                                error = VOP_ACCESS(devvp, VREAD | VWRITE,
1.7       fvdl      309:                                                   p->p_ucred, p);
1.1       jdolecek  310:                                VOP_UNLOCK(devvp, 0);
                    311:                                if (error)
                    312:                                        return (error);
                    313:                        }
                    314:                        pmp->pm_flags &= ~MSDOSFSMNT_RONLY;
                    315:                }
                    316:                if (args.fspec == 0) {
                    317: #ifdef __notyet__              /* doesn't work correctly with current mountd   XXX */
                    318:                        if (args.flags & MSDOSFSMNT_MNTOPT) {
                    319:                                pmp->pm_flags &= ~MSDOSFSMNT_MNTOPT;
                    320:                                pmp->pm_flags |= args.flags & MSDOSFSMNT_MNTOPT;
                    321:                                if (pmp->pm_flags & MSDOSFSMNT_NOWIN95)
                    322:                                        pmp->pm_flags |= MSDOSFSMNT_SHORTNAME;
                    323:                        }
                    324: #endif
                    325:                        /*
                    326:                         * Process export requests.
                    327:                         */
                    328:                        return (vfs_export(mp, &pmp->pm_export, &args.export));
                    329:                }
                    330:        }
                    331:        /*
                    332:         * Not an update, or updating the name: look up the name
                    333:         * and verify that it refers to a sensible block device.
                    334:         */
1.7       fvdl      335:        NDINIT(ndp, LOOKUP, FOLLOW, UIO_USERSPACE, args.fspec, p);
1.1       jdolecek  336:        if ((error = namei(ndp)) != 0)
                    337:                return (error);
                    338:        devvp = ndp->ni_vp;
                    339:
                    340:        if (devvp->v_type != VBLK) {
                    341:                vrele(devvp);
                    342:                return (ENOTBLK);
                    343:        }
                    344:        if (bdevsw_lookup(devvp->v_rdev) == NULL) {
                    345:                vrele(devvp);
                    346:                return (ENXIO);
                    347:        }
                    348:        /*
                    349:         * If mount by non-root, then verify that user has necessary
                    350:         * permissions on the device.
                    351:         */
                    352:        if (p->p_ucred->cr_uid != 0) {
                    353:                accessmode = VREAD;
                    354:                if ((mp->mnt_flag & MNT_RDONLY) == 0)
                    355:                        accessmode |= VWRITE;
                    356:                vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
1.7       fvdl      357:                error = VOP_ACCESS(devvp, accessmode, p->p_ucred, p);
1.1       jdolecek  358:                VOP_UNLOCK(devvp, 0);
                    359:                if (error) {
                    360:                        vrele(devvp);
                    361:                        return (error);
                    362:                }
                    363:        }
                    364:        if ((mp->mnt_flag & MNT_UPDATE) == 0) {
1.7       fvdl      365:                error = msdosfs_mountfs(devvp, mp, p, &args);
1.1       jdolecek  366: #ifdef MSDOSFS_DEBUG           /* only needed for the printf below */
                    367:                pmp = VFSTOMSDOSFS(mp);
                    368: #endif
                    369:        } else {
                    370:                if (devvp != pmp->pm_devvp)
                    371:                        error = EINVAL; /* needs translation */
                    372:                else
                    373:                        vrele(devvp);
                    374:        }
                    375:        if (error) {
                    376:                vrele(devvp);
                    377:                return (error);
                    378:        }
                    379:
1.6       thorpej   380:        if ((error = update_mp(mp, &args)) != 0) {
1.7       fvdl      381:                msdosfs_unmount(mp, MNT_FORCE, p);
1.1       jdolecek  382:                return error;
                    383:        }
                    384:
                    385: #ifdef MSDOSFS_DEBUG
                    386:        printf("msdosfs_mount(): mp %p, pmp %p, inusemap %p\n", mp, pmp, pmp->pm_inusemap);
                    387: #endif
1.4       christos  388:        return set_statfs_info(path, UIO_USERSPACE, args.fspec, UIO_USERSPACE,
1.7       fvdl      389:            mp, p);
1.1       jdolecek  390: }
                    391:
                    392: int
1.7       fvdl      393: msdosfs_mountfs(devvp, mp, p, argp)
1.1       jdolecek  394:        struct vnode *devvp;
                    395:        struct mount *mp;
1.7       fvdl      396:        struct proc *p;
1.1       jdolecek  397:        struct msdosfs_args *argp;
                    398: {
                    399:        struct msdosfsmount *pmp;
                    400:        struct buf *bp;
                    401:        dev_t dev = devvp->v_rdev;
                    402:        struct partinfo dpart;
                    403:        union bootsector *bsp;
                    404:        struct byte_bpb33 *b33;
                    405:        struct byte_bpb50 *b50;
                    406:        struct byte_bpb710 *b710;
                    407:        u_int8_t SecPerClust;
                    408:        int     ronly, error;
                    409:        int     bsize = 0, dtype = 0, tmp;
                    410:        u_long  dirsperblk;
                    411:
                    412:        /*
                    413:         * Disallow multiple mounts of the same device.
                    414:         * Disallow mounting of a device that is currently in use
                    415:         * (except for root, which might share swap device for miniroot).
                    416:         * Flush out any old buffers remaining from a previous use.
                    417:         */
                    418:        if ((error = vfs_mountedon(devvp)) != 0)
                    419:                return (error);
                    420:        if (vcount(devvp) > 1 && devvp != rootvp)
                    421:                return (EBUSY);
1.7       fvdl      422:        if ((error = vinvalbuf(devvp, V_SAVE, p->p_ucred, p, 0, 0)) != 0)
1.1       jdolecek  423:                return (error);
                    424:
                    425:        ronly = (mp->mnt_flag & MNT_RDONLY) != 0;
1.7       fvdl      426:        error = VOP_OPEN(devvp, ronly ? FREAD : FREAD|FWRITE, FSCRED, p);
1.1       jdolecek  427:        if (error)
                    428:                return (error);
                    429:
                    430:        bp  = NULL; /* both used in error_exit */
                    431:        pmp = NULL;
                    432:
                    433:        if (argp->flags & MSDOSFSMNT_GEMDOSFS) {
                    434:                /*
                    435:                 * We need the disklabel to calculate the size of a FAT entry
                    436:                 * later on. Also make sure the partition contains a filesystem
                    437:                 * of type FS_MSDOS. This doesn't work for floppies, so we have
                    438:                 * to check for them too.
                    439:                 *
                    440:                 * At least some parts of the msdos fs driver seem to assume
                    441:                 * that the size of a disk block will always be 512 bytes.
                    442:                 * Let's check it...
                    443:                 */
1.7       fvdl      444:                error = VOP_IOCTL(devvp, DIOCGPART, &dpart, FREAD, NOCRED, p);
1.1       jdolecek  445:                if (error)
                    446:                        goto error_exit;
                    447:                tmp   = dpart.part->p_fstype;
                    448:                dtype = dpart.disklab->d_type;
                    449:                bsize = dpart.disklab->d_secsize;
                    450:                if (bsize != 512 || (dtype!=DTYPE_FLOPPY && tmp!=FS_MSDOS)) {
                    451:                        error = EINVAL;
                    452:                        goto error_exit;
                    453:                }
                    454:        }
                    455:
                    456:        /*
                    457:         * Read the boot sector of the filesystem, and then check the
                    458:         * boot signature.  If not a dos boot sector then error out.
                    459:         */
                    460:        if ((error = bread(devvp, 0, 512, NOCRED, &bp)) != 0)
                    461:                goto error_exit;
                    462:        bp->b_flags |= B_AGE;
                    463:        bsp = (union bootsector *)bp->b_data;
                    464:        b33 = (struct byte_bpb33 *)bsp->bs33.bsBPB;
                    465:        b50 = (struct byte_bpb50 *)bsp->bs50.bsBPB;
1.10      lukem     466:        b710 = (struct byte_bpb710 *)bsp->bs710.bsBPB;
1.1       jdolecek  467:
                    468:        if (!(argp->flags & MSDOSFSMNT_GEMDOSFS)) {
                    469:                if (bsp->bs50.bsBootSectSig0 != BOOTSIG0
                    470:                    || bsp->bs50.bsBootSectSig1 != BOOTSIG1) {
                    471:                        error = EINVAL;
                    472:                        goto error_exit;
                    473:                }
                    474:        }
                    475:
                    476:        pmp = malloc(sizeof *pmp, M_MSDOSFSMNT, M_WAITOK);
1.3       dsl       477:        memset(pmp, 0, sizeof *pmp);
1.1       jdolecek  478:        pmp->pm_mountp = mp;
                    479:
                    480:        /*
                    481:         * Compute several useful quantities from the bpb in the
                    482:         * bootsector.  Copy in the dos 5 variant of the bpb then fix up
                    483:         * the fields that are different between dos 5 and dos 3.3.
                    484:         */
                    485:        SecPerClust = b50->bpbSecPerClust;
                    486:        pmp->pm_BytesPerSec = getushort(b50->bpbBytesPerSec);
                    487:        pmp->pm_ResSectors = getushort(b50->bpbResSectors);
                    488:        pmp->pm_FATs = b50->bpbFATs;
                    489:        pmp->pm_RootDirEnts = getushort(b50->bpbRootDirEnts);
                    490:        pmp->pm_Sectors = getushort(b50->bpbSectors);
                    491:        pmp->pm_FATsecs = getushort(b50->bpbFATsecs);
                    492:        pmp->pm_SecPerTrack = getushort(b50->bpbSecPerTrack);
                    493:        pmp->pm_Heads = getushort(b50->bpbHeads);
                    494:        pmp->pm_Media = b50->bpbMedia;
                    495:
                    496:        if (!(argp->flags & MSDOSFSMNT_GEMDOSFS)) {
                    497:                /* XXX - We should probably check more values here */
                    498:                if (!pmp->pm_BytesPerSec || !SecPerClust
                    499:                        || pmp->pm_Heads > 255 || pmp->pm_SecPerTrack > 63) {
                    500:                        error = EINVAL;
                    501:                        goto error_exit;
                    502:                }
                    503:        }
                    504:
                    505:        if (pmp->pm_Sectors == 0) {
                    506:                pmp->pm_HiddenSects = getulong(b50->bpbHiddenSecs);
                    507:                pmp->pm_HugeSectors = getulong(b50->bpbHugeSectors);
                    508:        } else {
                    509:                pmp->pm_HiddenSects = getushort(b33->bpbHiddenSecs);
                    510:                pmp->pm_HugeSectors = pmp->pm_Sectors;
                    511:        }
                    512:        dirsperblk = pmp->pm_BytesPerSec / sizeof(struct direntry);
                    513:        if (pmp->pm_HugeSectors > 0xffffffff / dirsperblk + 1) {
                    514:                /*
                    515:                 * We cannot deal currently with this size of disk
                    516:                 * due to fileid limitations (see msdosfs_getattr and
                    517:                 * msdosfs_readdir)
                    518:                 */
                    519:                error = EINVAL;
                    520:                goto error_exit;
                    521:        }
                    522:
                    523:        if (pmp->pm_RootDirEnts == 0) {
                    524:                if (bsp->bs710.bsBootSectSig2 != BOOTSIG2
                    525:                    || bsp->bs710.bsBootSectSig3 != BOOTSIG3
                    526:                    || pmp->pm_Sectors
                    527:                    || pmp->pm_FATsecs
                    528:                    || getushort(b710->bpbFSVers)) {
                    529:                        error = EINVAL;
                    530:                        goto error_exit;
                    531:                }
                    532:                pmp->pm_fatmask = FAT32_MASK;
                    533:                pmp->pm_fatmult = 4;
                    534:                pmp->pm_fatdiv = 1;
                    535:                pmp->pm_FATsecs = getulong(b710->bpbBigFATsecs);
                    536:
                    537:                /* mirrorring is enabled if the FATMIRROR bit is not set */
                    538:                if ((getushort(b710->bpbExtFlags) & FATMIRROR) == 0)
                    539:                        pmp->pm_flags |= MSDOSFS_FATMIRROR;
                    540:                else
                    541:                        pmp->pm_curfat = getushort(b710->bpbExtFlags) & FATNUM;
                    542:        } else
                    543:                pmp->pm_flags |= MSDOSFS_FATMIRROR;
                    544:
                    545:        if (argp->flags & MSDOSFSMNT_GEMDOSFS) {
                    546:                if (FAT32(pmp)) {
                    547:                        /*
                    548:                         * GEMDOS doesn't know fat32.
                    549:                         */
                    550:                        error = EINVAL;
                    551:                        goto error_exit;
                    552:                }
                    553:
                    554:                /*
                    555:                 * Check a few values (could do some more):
                    556:                 * - logical sector size: power of 2, >= block size
                    557:                 * - sectors per cluster: power of 2, >= 1
                    558:                 * - number of sectors:   >= 1, <= size of partition
                    559:                 */
                    560:                if ( (SecPerClust == 0)
                    561:                  || (SecPerClust & (SecPerClust - 1))
                    562:                  || (pmp->pm_BytesPerSec < bsize)
                    563:                  || (pmp->pm_BytesPerSec & (pmp->pm_BytesPerSec - 1))
                    564:                  || (pmp->pm_HugeSectors == 0)
                    565:                  || (pmp->pm_HugeSectors * (pmp->pm_BytesPerSec / bsize)
                    566:                                                        > dpart.part->p_size)
                    567:                   ) {
                    568:                        error = EINVAL;
                    569:                        goto error_exit;
                    570:                }
                    571:                /*
                    572:                 * XXX - Many parts of the msdos fs driver seem to assume that
                    573:                 * the number of bytes per logical sector (BytesPerSec) will
                    574:                 * always be the same as the number of bytes per disk block
                    575:                 * Let's pretend it is.
                    576:                 */
                    577:                tmp = pmp->pm_BytesPerSec / bsize;
                    578:                pmp->pm_BytesPerSec  = bsize;
                    579:                pmp->pm_HugeSectors *= tmp;
                    580:                pmp->pm_HiddenSects *= tmp;
                    581:                pmp->pm_ResSectors  *= tmp;
                    582:                pmp->pm_Sectors     *= tmp;
                    583:                pmp->pm_FATsecs     *= tmp;
                    584:                SecPerClust         *= tmp;
                    585:        }
                    586:        pmp->pm_fatblk = pmp->pm_ResSectors;
                    587:        if (FAT32(pmp)) {
                    588:                pmp->pm_rootdirblk = getulong(b710->bpbRootClust);
                    589:                pmp->pm_firstcluster = pmp->pm_fatblk
                    590:                        + (pmp->pm_FATs * pmp->pm_FATsecs);
                    591:                pmp->pm_fsinfo = getushort(b710->bpbFSInfo);
                    592:        } else {
                    593:                pmp->pm_rootdirblk = pmp->pm_fatblk +
                    594:                        (pmp->pm_FATs * pmp->pm_FATsecs);
                    595:                pmp->pm_rootdirsize = (pmp->pm_RootDirEnts * sizeof(struct direntry)
                    596:                                       + pmp->pm_BytesPerSec - 1)
                    597:                        / pmp->pm_BytesPerSec;/* in sectors */
                    598:                pmp->pm_firstcluster = pmp->pm_rootdirblk + pmp->pm_rootdirsize;
                    599:        }
                    600:
                    601:        pmp->pm_nmbrofclusters = (pmp->pm_HugeSectors - pmp->pm_firstcluster) /
                    602:            SecPerClust;
                    603:        pmp->pm_maxcluster = pmp->pm_nmbrofclusters + 1;
                    604:        pmp->pm_fatsize = pmp->pm_FATsecs * pmp->pm_BytesPerSec;
                    605:
                    606:        if (argp->flags & MSDOSFSMNT_GEMDOSFS) {
                    607:                if (pmp->pm_nmbrofclusters <= (0xff0 - 2)
                    608:                      && (dtype == DTYPE_FLOPPY
                    609:                          || (dtype == DTYPE_VND
                    610:                                && (pmp->pm_Heads == 1 || pmp->pm_Heads == 2)))
                    611:                    ) {
                    612:                        pmp->pm_fatmask = FAT12_MASK;
                    613:                        pmp->pm_fatmult = 3;
                    614:                        pmp->pm_fatdiv = 2;
                    615:                } else {
                    616:                        pmp->pm_fatmask = FAT16_MASK;
                    617:                        pmp->pm_fatmult = 2;
                    618:                        pmp->pm_fatdiv = 1;
                    619:                }
                    620:        } else if (pmp->pm_fatmask == 0) {
                    621:                if (pmp->pm_maxcluster
                    622:                    <= ((CLUST_RSRVD - CLUST_FIRST) & FAT12_MASK)) {
                    623:                        /*
                    624:                         * This will usually be a floppy disk. This size makes
                    625:                         * sure that one fat entry will not be split across
                    626:                         * multiple blocks.
                    627:                         */
                    628:                        pmp->pm_fatmask = FAT12_MASK;
                    629:                        pmp->pm_fatmult = 3;
                    630:                        pmp->pm_fatdiv = 2;
                    631:                } else {
                    632:                        pmp->pm_fatmask = FAT16_MASK;
                    633:                        pmp->pm_fatmult = 2;
                    634:                        pmp->pm_fatdiv = 1;
                    635:                }
                    636:        }
                    637:        if (FAT12(pmp))
                    638:                pmp->pm_fatblocksize = 3 * pmp->pm_BytesPerSec;
                    639:        else
                    640:                pmp->pm_fatblocksize = MAXBSIZE;
                    641:
                    642:        pmp->pm_fatblocksec = pmp->pm_fatblocksize / pmp->pm_BytesPerSec;
                    643:        pmp->pm_bnshift = ffs(pmp->pm_BytesPerSec) - 1;
                    644:
                    645:        /*
                    646:         * Compute mask and shift value for isolating cluster relative byte
                    647:         * offsets and cluster numbers from a file offset.
                    648:         */
                    649:        pmp->pm_bpcluster = SecPerClust * pmp->pm_BytesPerSec;
                    650:        pmp->pm_crbomask = pmp->pm_bpcluster - 1;
                    651:        pmp->pm_cnshift = ffs(pmp->pm_bpcluster) - 1;
                    652:
                    653:        /*
                    654:         * Check for valid cluster size
                    655:         * must be a power of 2
                    656:         */
                    657:        if (pmp->pm_bpcluster ^ (1 << pmp->pm_cnshift)) {
                    658:                error = EINVAL;
                    659:                goto error_exit;
                    660:        }
                    661:
                    662:        /*
                    663:         * Release the bootsector buffer.
                    664:         */
                    665:        brelse(bp);
                    666:        bp = NULL;
                    667:
                    668:        /*
                    669:         * Check FSInfo.
                    670:         */
                    671:        if (pmp->pm_fsinfo) {
                    672:                struct fsinfo *fp;
                    673:
                    674:                if ((error = bread(devvp, pmp->pm_fsinfo, 1024, NOCRED, &bp)) != 0)
                    675:                        goto error_exit;
                    676:                fp = (struct fsinfo *)bp->b_data;
                    677:                if (!memcmp(fp->fsisig1, "RRaA", 4)
                    678:                    && !memcmp(fp->fsisig2, "rrAa", 4)
                    679:                    && !memcmp(fp->fsisig3, "\0\0\125\252", 4)
                    680:                    && !memcmp(fp->fsisig4, "\0\0\125\252", 4))
                    681:                        pmp->pm_nxtfree = getulong(fp->fsinxtfree);
                    682:                else
                    683:                        pmp->pm_fsinfo = 0;
                    684:                brelse(bp);
                    685:                bp = NULL;
                    686:        }
                    687:
                    688:        /*
                    689:         * Check and validate (or perhaps invalidate?) the fsinfo structure?
                    690:         * XXX
                    691:         */
                    692:        if (pmp->pm_fsinfo) {
                    693:                if (pmp->pm_nxtfree == (u_long)-1)
                    694:                        pmp->pm_fsinfo = 0;
                    695:        }
                    696:
                    697:        /*
                    698:         * Allocate memory for the bitmap of allocated clusters, and then
                    699:         * fill it in.
                    700:         */
                    701:        pmp->pm_inusemap = malloc(((pmp->pm_maxcluster + N_INUSEBITS - 1)
                    702:                                   / N_INUSEBITS)
                    703:                                  * sizeof(*pmp->pm_inusemap),
                    704:                                  M_MSDOSFSFAT, M_WAITOK);
                    705:
                    706:        /*
                    707:         * fillinusemap() needs pm_devvp.
                    708:         */
                    709:        pmp->pm_dev = dev;
                    710:        pmp->pm_devvp = devvp;
                    711:
                    712:        /*
                    713:         * Have the inuse map filled in.
                    714:         */
                    715:        if ((error = fillinusemap(pmp)) != 0)
                    716:                goto error_exit;
                    717:
                    718:        /*
                    719:         * If they want fat updates to be synchronous then let them suffer
                    720:         * the performance degradation in exchange for the on disk copy of
                    721:         * the fat being correct just about all the time.  I suppose this
                    722:         * would be a good thing to turn on if the kernel is still flakey.
                    723:         */
                    724:        if (mp->mnt_flag & MNT_SYNCHRONOUS)
                    725:                pmp->pm_flags |= MSDOSFSMNT_WAITONFAT;
                    726:
                    727:        /*
                    728:         * Finish up.
                    729:         */
                    730:        if (ronly)
                    731:                pmp->pm_flags |= MSDOSFSMNT_RONLY;
                    732:        else
                    733:                pmp->pm_fmod = 1;
                    734:        mp->mnt_data = pmp;
                    735:         mp->mnt_stat.f_fsid.val[0] = (long)dev;
                    736:         mp->mnt_stat.f_fsid.val[1] = makefstype(MOUNT_MSDOS);
                    737:        mp->mnt_flag |= MNT_LOCAL;
                    738:        mp->mnt_dev_bshift = pmp->pm_bnshift;
                    739:        mp->mnt_fs_bshift = pmp->pm_cnshift;
                    740:
                    741: #ifdef QUOTA
                    742:        /*
                    743:         * If we ever do quotas for DOS filesystems this would be a place
                    744:         * to fill in the info in the msdosfsmount structure. You dolt,
                    745:         * quotas on dos filesystems make no sense because files have no
                    746:         * owners on dos filesystems. of course there is some empty space
                    747:         * in the directory entry where we could put uid's and gid's.
                    748:         */
                    749: #endif
                    750:        devvp->v_specmountpoint = mp;
                    751:
                    752:        return (0);
                    753:
                    754: error_exit:;
                    755:        if (bp)
                    756:                brelse(bp);
                    757:        vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
1.7       fvdl      758:        (void) VOP_CLOSE(devvp, ronly ? FREAD : FREAD|FWRITE, NOCRED, p);
1.1       jdolecek  759:        VOP_UNLOCK(devvp, 0);
                    760:        if (pmp) {
                    761:                if (pmp->pm_inusemap)
                    762:                        free(pmp->pm_inusemap, M_MSDOSFSFAT);
                    763:                free(pmp, M_MSDOSFSMNT);
                    764:                mp->mnt_data = NULL;
                    765:        }
                    766:        return (error);
                    767: }
                    768:
                    769: int
1.7       fvdl      770: msdosfs_start(mp, flags, p)
1.1       jdolecek  771:        struct mount *mp;
                    772:        int flags;
1.7       fvdl      773:        struct proc *p;
1.1       jdolecek  774: {
                    775:
                    776:        return (0);
                    777: }
                    778:
                    779: /*
                    780:  * Unmount the filesystem described by mp.
                    781:  */
                    782: int
1.7       fvdl      783: msdosfs_unmount(mp, mntflags, p)
1.1       jdolecek  784:        struct mount *mp;
                    785:        int mntflags;
1.7       fvdl      786:        struct proc *p;
1.1       jdolecek  787: {
                    788:        struct msdosfsmount *pmp;
                    789:        int error, flags;
                    790:
                    791:        flags = 0;
                    792:        if (mntflags & MNT_FORCE)
                    793:                flags |= FORCECLOSE;
                    794: #ifdef QUOTA
                    795: #endif
                    796:        if ((error = vflush(mp, NULLVP, flags)) != 0)
                    797:                return (error);
                    798:        pmp = VFSTOMSDOSFS(mp);
                    799:        if (pmp->pm_devvp->v_type != VBAD)
                    800:                pmp->pm_devvp->v_specmountpoint = NULL;
                    801: #ifdef MSDOSFS_DEBUG
                    802:        {
                    803:                struct vnode *vp = pmp->pm_devvp;
                    804:
                    805:                printf("msdosfs_umount(): just before calling VOP_CLOSE()\n");
                    806:                printf("flag %08x, usecount %d, writecount %ld, holdcnt %ld\n",
                    807:                    vp->v_flag, vp->v_usecount, vp->v_writecount, vp->v_holdcnt);
                    808:                printf("id %lu, mount %p, op %p\n",
                    809:                    vp->v_id, vp->v_mount, vp->v_op);
                    810:                printf("freef %p, freeb %p, mount %p\n",
                    811:                    vp->v_freelist.tqe_next, vp->v_freelist.tqe_prev,
                    812:                    vp->v_mount);
                    813:                printf("cleanblkhd %p, dirtyblkhd %p, numoutput %d, type %d\n",
                    814:                    vp->v_cleanblkhd.lh_first,
                    815:                    vp->v_dirtyblkhd.lh_first,
                    816:                    vp->v_numoutput, vp->v_type);
                    817:                printf("union %p, tag %d, data[0] %08x, data[1] %08x\n",
                    818:                    vp->v_socket, vp->v_tag,
                    819:                    ((u_int *)vp->v_data)[0],
                    820:                    ((u_int *)vp->v_data)[1]);
                    821:        }
                    822: #endif
                    823:        vn_lock(pmp->pm_devvp, LK_EXCLUSIVE | LK_RETRY);
                    824:        error = VOP_CLOSE(pmp->pm_devvp,
1.7       fvdl      825:            pmp->pm_flags & MSDOSFSMNT_RONLY ? FREAD : FREAD|FWRITE, NOCRED, p);
1.1       jdolecek  826:        vput(pmp->pm_devvp);
                    827:        free(pmp->pm_inusemap, M_MSDOSFSFAT);
                    828:        free(pmp, M_MSDOSFSMNT);
                    829:        mp->mnt_data = NULL;
                    830:        mp->mnt_flag &= ~MNT_LOCAL;
                    831:        return (error);
                    832: }
                    833:
                    834: int
1.6       thorpej   835: msdosfs_root(mp, vpp)
1.1       jdolecek  836:        struct mount *mp;
                    837:        struct vnode **vpp;
                    838: {
                    839:        struct msdosfsmount *pmp = VFSTOMSDOSFS(mp);
                    840:        struct denode *ndep;
                    841:        int error;
                    842:
                    843: #ifdef MSDOSFS_DEBUG
                    844:        printf("msdosfs_root(); mp %p, pmp %p\n", mp, pmp);
                    845: #endif
                    846:        if ((error = deget(pmp, MSDOSFSROOT, MSDOSFSROOT_OFS, &ndep)) != 0)
                    847:                return (error);
                    848:        *vpp = DETOV(ndep);
                    849:        return (0);
                    850: }
                    851:
                    852: int
1.7       fvdl      853: msdosfs_quotactl(mp, cmds, uid, arg, p)
1.1       jdolecek  854:        struct mount *mp;
                    855:        int cmds;
                    856:        uid_t uid;
                    857:        caddr_t arg;
1.7       fvdl      858:        struct proc *p;
1.1       jdolecek  859: {
                    860:
                    861: #ifdef QUOTA
                    862:        return (EOPNOTSUPP);
                    863: #else
                    864:        return (EOPNOTSUPP);
                    865: #endif
                    866: }
                    867:
                    868: int
1.7       fvdl      869: msdosfs_statfs(mp, sbp, p)
1.1       jdolecek  870:        struct mount *mp;
                    871:        struct statfs *sbp;
1.7       fvdl      872:        struct proc *p;
1.1       jdolecek  873: {
                    874:        struct msdosfsmount *pmp;
                    875:
                    876:        pmp = VFSTOMSDOSFS(mp);
                    877: #ifdef COMPAT_09
                    878:        sbp->f_type = 4;
                    879: #else
                    880:        sbp->f_type = 0;
                    881: #endif
                    882:        sbp->f_bsize = pmp->pm_bpcluster;
                    883:        sbp->f_iosize = pmp->pm_bpcluster;
                    884:        sbp->f_blocks = pmp->pm_nmbrofclusters;
                    885:        sbp->f_bfree = pmp->pm_freeclustercount;
                    886:        sbp->f_bavail = pmp->pm_freeclustercount;
                    887:        sbp->f_files = pmp->pm_RootDirEnts;                     /* XXX */
                    888:        sbp->f_ffree = 0;       /* what to put in here? */
1.4       christos  889:        copy_statfs_info(sbp, mp);
1.1       jdolecek  890:        return (0);
                    891: }
                    892:
                    893: int
1.7       fvdl      894: msdosfs_sync(mp, waitfor, cred, p)
1.1       jdolecek  895:        struct mount *mp;
                    896:        int waitfor;
                    897:        struct ucred *cred;
1.7       fvdl      898:        struct proc *p;
1.1       jdolecek  899: {
                    900:        struct vnode *vp, *nvp;
                    901:        struct denode *dep;
                    902:        struct msdosfsmount *pmp = VFSTOMSDOSFS(mp);
                    903:        int error, allerror = 0;
                    904:
                    905:        /*
                    906:         * If we ever switch to not updating all of the fats all the time,
                    907:         * this would be the place to update them from the first one.
                    908:         */
                    909:        if (pmp->pm_fmod != 0) {
                    910:                if (pmp->pm_flags & MSDOSFSMNT_RONLY)
                    911:                        panic("msdosfs_sync: rofs mod");
                    912:                else {
                    913:                        /* update fats here */
                    914:                }
                    915:        }
                    916:        /*
                    917:         * Write back each (modified) denode.
                    918:         */
                    919:        simple_lock(&mntvnode_slock);
                    920: loop:
                    921:        for (vp = mp->mnt_vnodelist.lh_first; vp != NULL; vp = nvp) {
                    922:                /*
                    923:                 * If the vnode that we are about to sync is no longer
                    924:                 * assoicated with this mount point, start over.
                    925:                 */
                    926:                if (vp->v_mount != mp)
                    927:                        goto loop;
                    928:                simple_lock(&vp->v_interlock);
                    929:                nvp = vp->v_mntvnodes.le_next;
                    930:                dep = VTODE(vp);
                    931:                if (waitfor == MNT_LAZY || vp->v_type == VNON ||
                    932:                    (((dep->de_flag &
                    933:                    (DE_ACCESS | DE_CREATE | DE_UPDATE | DE_MODIFIED)) == 0) &&
                    934:                     (LIST_EMPTY(&vp->v_dirtyblkhd) &&
                    935:                      vp->v_uobj.uo_npages == 0))) {
                    936:                        simple_unlock(&vp->v_interlock);
                    937:                        continue;
                    938:                }
                    939:                simple_unlock(&mntvnode_slock);
1.6       thorpej   940:                error = vget(vp, LK_EXCLUSIVE | LK_NOWAIT | LK_INTERLOCK);
1.1       jdolecek  941:                if (error) {
                    942:                        simple_lock(&mntvnode_slock);
                    943:                        if (error == ENOENT)
                    944:                                goto loop;
                    945:                        continue;
                    946:                }
                    947:                if ((error = VOP_FSYNC(vp, cred,
1.7       fvdl      948:                    waitfor == MNT_WAIT ? FSYNC_WAIT : 0, 0, 0, p)) != 0)
1.1       jdolecek  949:                        allerror = error;
                    950:                vput(vp);
                    951:                simple_lock(&mntvnode_slock);
                    952:        }
                    953:        simple_unlock(&mntvnode_slock);
                    954:        /*
                    955:         * Force stale file system control information to be flushed.
                    956:         */
                    957:        if ((error = VOP_FSYNC(pmp->pm_devvp, cred,
1.7       fvdl      958:            waitfor == MNT_WAIT ? FSYNC_WAIT : 0, 0, 0, p)) != 0)
1.1       jdolecek  959:                allerror = error;
                    960: #ifdef QUOTA
                    961:        /* qsync(mp); */
                    962: #endif
                    963:        return (allerror);
                    964: }
                    965:
                    966: int
1.6       thorpej   967: msdosfs_fhtovp(mp, fhp, vpp)
1.1       jdolecek  968:        struct mount *mp;
                    969:        struct fid *fhp;
                    970:        struct vnode **vpp;
                    971: {
                    972:        struct msdosfsmount *pmp = VFSTOMSDOSFS(mp);
                    973:        struct defid *defhp = (struct defid *) fhp;
                    974:        struct denode *dep;
                    975:        int error;
                    976:
                    977:        error = deget(pmp, defhp->defid_dirclust, defhp->defid_dirofs, &dep);
                    978:        if (error) {
                    979:                *vpp = NULLVP;
                    980:                return (error);
                    981:        }
                    982:        *vpp = DETOV(dep);
                    983:        return (0);
                    984: }
                    985:
                    986: int
                    987: msdosfs_checkexp(mp, nam, exflagsp, credanonp)
                    988:        struct mount *mp;
                    989:        struct mbuf *nam;
                    990:        int *exflagsp;
                    991:        struct ucred **credanonp;
                    992: {
                    993:        struct msdosfsmount *pmp = VFSTOMSDOSFS(mp);
                    994:        struct netcred *np;
                    995:
                    996:        np = vfs_export_lookup(mp, &pmp->pm_export, nam);
                    997:        if (np == NULL)
                    998:                return (EACCES);
                    999:        *exflagsp = np->netc_exflags;
                   1000:        *credanonp = &np->netc_anon;
                   1001:        return (0);
                   1002: }
                   1003:
                   1004: int
                   1005: msdosfs_vptofh(vp, fhp)
                   1006:        struct vnode *vp;
                   1007:        struct fid *fhp;
                   1008: {
                   1009:        struct denode *dep;
                   1010:        struct defid *defhp;
                   1011:
                   1012:        dep = VTODE(vp);
                   1013:        defhp = (struct defid *)fhp;
                   1014:        defhp->defid_len = sizeof(struct defid);
                   1015:        defhp->defid_dirclust = dep->de_dirclust;
                   1016:        defhp->defid_dirofs = dep->de_diroffset;
                   1017:        /* defhp->defid_gen = dep->de_gen; */
                   1018:        return (0);
                   1019: }
                   1020:
                   1021: int
1.6       thorpej  1022: msdosfs_vget(mp, ino, vpp)
1.1       jdolecek 1023:        struct mount *mp;
                   1024:        ino_t ino;
                   1025:        struct vnode **vpp;
                   1026: {
                   1027:
                   1028:        return (EOPNOTSUPP);
                   1029: }
                   1030:
1.12      atatat   1031: SYSCTL_SETUP(sysctl_vfs_msdosfs_setup, "sysctl vfs.msdosfs subtree setup")
1.1       jdolecek 1032: {
1.12      atatat   1033:
1.13      atatat   1034:        sysctl_createv(clog, 0, NULL, NULL,
                   1035:                       CTLFLAG_PERMANENT,
1.12      atatat   1036:                       CTLTYPE_NODE, "vfs", NULL,
                   1037:                       NULL, 0, NULL, 0,
                   1038:                       CTL_VFS, CTL_EOL);
1.13      atatat   1039:        sysctl_createv(clog, 0, NULL, NULL,
                   1040:                       CTLFLAG_PERMANENT,
1.13.2.1  tron     1041:                       CTLTYPE_NODE, "msdosfs",
                   1042:                       SYSCTL_DESCR("MS-DOS file system"),
1.12      atatat   1043:                       NULL, 0, NULL, 0,
                   1044:                       CTL_VFS, 4, CTL_EOL);
                   1045:        /*
                   1046:         * XXX the "4" above could be dynamic, thereby eliminating one
                   1047:         * more instance of the "number to vfs" mapping problem, but
                   1048:         * "4" is the order as taken from sys/mount.h
                   1049:         */
1.1       jdolecek 1050: }

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