root/msdosfs/msdosfs_vfsops.c

DEFINITIONS

1. msdosfs_mount
2. msdosfs_mountfs
3. msdosfs_start
4. msdosfs_unmount
5. msdosfs_root
6. msdosfs_statfs
7. msdosfs_sync_vnode
8. msdosfs_sync
9. msdosfs_fhtovp
10. msdosfs_vptofh
11. msdosfs_check_export

    1 /*      $OpenBSD: msdosfs_vfsops.c,v 1.47 2007/03/21 17:29:32 thib Exp $        */
    2 /*      $NetBSD: msdosfs_vfsops.c,v 1.48 1997/10/18 02:54:57 briggs Exp $       */
    4 /*-
    5  * Copyright (C) 1994, 1995, 1997 Wolfgang Solfrank.
    6  * Copyright (C) 1994, 1995, 1997 TooLs GmbH.
    7  * All rights reserved.
    8  * Original code by Paul Popelka (paulp@uts.amdahl.com) (see below).
    9  *
   10  * Redistribution and use in source and binary forms, with or without
   11  * modification, are permitted provided that the following conditions
   12  * are met:
   13  * 1. Redistributions of source code must retain the above copyright
   14  *    notice, this list of conditions and the following disclaimer.
   15  * 2. Redistributions in binary form must reproduce the above copyright
   16  *    notice, this list of conditions and the following disclaimer in the
   17  *    documentation and/or other materials provided with the distribution.
   18  * 3. All advertising materials mentioning features or use of this software
   19  *    must display the following acknowledgement:
   20  *      This product includes software developed by TooLs GmbH.
   21  * 4. The name of TooLs GmbH may not be used to endorse or promote products
   22  *    derived from this software without specific prior written permission.
   23  *
   24  * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR
   25  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   26  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   27  * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   28  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
   29  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
   30  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
   31  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
   32  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
   33  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   34  */
   35 /*
   36  * Written by Paul Popelka (paulp@uts.amdahl.com)
   37  * 
   38  * You can do anything you want with this software, just don't say you wrote
   39  * it, and don't remove this notice.
   40  * 
   41  * This software is provided "as is".
   42  * 
   43  * The author supplies this software to be publicly redistributed on the
   44  * understanding that the author is not responsible for the correct
   45  * functioning of this software in any circumstances and is not liable for
   46  * any damages caused by this software.
   47  * 
   48  * October 1992
   49  */
   51 #include <sys/param.h>
   52 #include <sys/systm.h>
   53 #include <sys/namei.h>
   54 #include <sys/proc.h>
   55 #include <sys/kernel.h>
   56 #include <sys/vnode.h>
   57 #include <miscfs/specfs/specdev.h> /* XXX */    /* defines v_rdev */
   58 #include <sys/mount.h>
   59 #include <sys/buf.h>
   60 #include <sys/file.h>
   61 #include <sys/disklabel.h>
   62 #include <sys/ioctl.h>
   63 #include <sys/malloc.h>
   64 #include <sys/dirent.h>
   66 #include <msdosfs/bpb.h>
   67 #include <msdosfs/bootsect.h>
   68 #include <msdosfs/direntry.h>
   69 #include <msdosfs/denode.h>
   70 #include <msdosfs/msdosfsmount.h>
   71 #include <msdosfs/fat.h>
   73 int msdosfs_mount(struct mount *, const char *, void *, struct nameidata *,
   74                        struct proc *);
   75 int msdosfs_start(struct mount *, int, struct proc *);
   76 int msdosfs_unmount(struct mount *, int, struct proc *);
   77 int msdosfs_root(struct mount *, struct vnode **);
   78 int msdosfs_statfs(struct mount *, struct statfs *, struct proc *);
   79 int msdosfs_sync(struct mount *, int, struct ucred *, struct proc *);
   80 int msdosfs_fhtovp(struct mount *, struct fid *, struct vnode **);
   81 int msdosfs_vptofh(struct vnode *, struct fid *);
   82 int msdosfs_check_export(struct mount *mp, struct mbuf *nam,
   83                               int *extflagsp, struct ucred **credanonp);
   85 int msdosfs_mountfs(struct vnode *, struct mount *, struct proc *,
   86                          struct msdosfs_args *);
   88 int msdosfs_sync_vnode(struct vnode *, void *);
   90 /*
   91  * mp - path - addr in user space of mount point (ie /usr or whatever) 
   92  * data - addr in user space of mount params including the name of the block
   93  * special file to treat as a filesystem. 
   94  */
   95 int
msdosfs_mount(mp, path, data, ndp, p)
   97         struct mount *mp;
   98         const char *path;
   99         void *data;
  100         struct nameidata *ndp;
  101         struct proc *p;
  102 {
  103         struct vnode *devvp;      /* vnode for blk device to mount */
  104         struct msdosfs_args args; /* will hold data from mount request */
  105         /* msdosfs specific mount control block */
  106         struct msdosfsmount *pmp = NULL;
size_t size;
  108         int error, flags;
mode_t accessmode;
error = copyin(data, &args, sizeof(struct msdosfs_args));
  112         if (error)
  113                 return (error);
  114         /*
  115          * If updating, check whether changing from read-only to
  116          * read/write; if there is no device name, that's all we do.
  117          */
  118         if (mp->mnt_flag & MNT_UPDATE) {
pmp = VFSTOMSDOSFS(mp);
error = 0;
  121                 if (!(pmp->pm_flags & MSDOSFSMNT_RONLY) && (mp->mnt_flag & MNT_RDONLY)) {
flags = WRITECLOSE;
  123                         if (mp->mnt_flag & MNT_FORCE)
flags |= FORCECLOSE;
error = vflush(mp, NULLVP, flags);
  126                 }
  127                 if (!error && (mp->mnt_flag & MNT_RELOAD))
  128                         /* not yet implemented */
error = EOPNOTSUPP;
  130                 if (error)
  131                         return (error);
  132                 if ((pmp->pm_flags & MSDOSFSMNT_RONLY) && (mp->mnt_flag & MNT_WANTRDWR)) {
  133                         /*
  134                          * If upgrade to read-write by non-root, then verify
  135                          * that user has necessary permissions on the device.
  136                          */
  137                         if (p->p_ucred->cr_uid != 0) {
devvp = pmp->pm_devvp;
vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, p);
error = VOP_ACCESS(devvp, VREAD | VWRITE,
p->p_ucred, p);
  142                                 if (error) {
VOP_UNLOCK(devvp, 0, p);
  144                                         return (error);
  145                                 }
VOP_UNLOCK(devvp, 0, p);
  147                         }
pmp->pm_flags &= ~MSDOSFSMNT_RONLY;
  149                 }
  150                 if (args.fspec == 0) {
  151 #ifdef  __notyet__              /* doesn't work correctly with current mountd   XXX */
  152                         if (args.flags & MSDOSFSMNT_MNTOPT) {
pmp->pm_flags &= ~MSDOSFSMNT_MNTOPT;
pmp->pm_flags |= args.flags & MSDOSFSMNT_MNTOPT;
  155                                 if (pmp->pm_flags & MSDOSFSMNT_NOWIN95)
pmp->pm_flags |= MSDOSFSMNT_SHORTNAME;
  157                         }
  158 #endif
  159                         /*
  160                          * Process export requests.
  161                          */
  162                         return (vfs_export(mp, &pmp->pm_export, 
  163                             &args.export_info));
  164                 }
  165         }
  166         /*
  167          * Not an update, or updating the name: look up the name
  168          * and verify that it refers to a sensible block device.
  169          */
NDINIT(ndp, LOOKUP, FOLLOW, UIO_USERSPACE, args.fspec, p);
  171         if ((error = namei(ndp)) != 0)
  172                 return (error);
devvp = ndp->ni_vp;
  175         if (devvp->v_type != VBLK) {
vrele(devvp);
  177                 return (ENOTBLK);
  178         }
  179         if (major(devvp->v_rdev) >= nblkdev) {
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) {
accessmode = VREAD;
  189                 if ((mp->mnt_flag & MNT_RDONLY) == 0)
accessmode |= VWRITE;
vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, p);
error = VOP_ACCESS(devvp, accessmode, p->p_ucred, p);
  193                 if (error) {
vput(devvp);
  195                         return (error);
  196                 }
VOP_UNLOCK(devvp, 0, p);
  198         }
  199         if ((mp->mnt_flag & MNT_UPDATE) == 0)
error = msdosfs_mountfs(devvp, mp, p, &args);
  201         else {
  202                 if (devvp != pmp->pm_devvp)
error = EINVAL; /* XXX needs translation */
  204                 else
vrele(devvp);
  206         }
  207         if (error) {
vrele(devvp);
  209                 return (error);
  210         }
pmp = VFSTOMSDOSFS(mp);
pmp->pm_gid = args.gid;
pmp->pm_uid = args.uid;
pmp->pm_mask = args.mask;
pmp->pm_flags |= args.flags & MSDOSFSMNT_MNTOPT;
  217         if (pmp->pm_flags & MSDOSFSMNT_NOWIN95)
pmp->pm_flags |= MSDOSFSMNT_SHORTNAME;
  219         else if (!(pmp->pm_flags & (MSDOSFSMNT_SHORTNAME | MSDOSFSMNT_LONGNAME))) {
  220                 struct vnode *rvp;
  222                 /*
  223                  * Try to divine whether to support Win'95 long filenames
  224                  */
  225                 if (FAT32(pmp))
pmp->pm_flags |= MSDOSFSMNT_LONGNAME;
  227                 else {
  228                         if ((error = msdosfs_root(mp, &rvp)) != 0) {
msdosfs_unmount(mp, MNT_FORCE, p);
  230                                 return (error);
  231                         }
pmp->pm_flags |= findwin95(VTODE(rvp))
  233                              ? MSDOSFSMNT_LONGNAME
  234                              : MSDOSFSMNT_SHORTNAME;
vput(rvp);
  236                 }
  237         }
  238         (void) copyinstr(path, mp->mnt_stat.f_mntonname, MNAMELEN - 1, &size);
bzero(mp->mnt_stat.f_mntonname + size, MNAMELEN - size);
  240         (void) copyinstr(args.fspec, mp->mnt_stat.f_mntfromname, MNAMELEN - 1,
  241             &size);
bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
bcopy(&args, &mp->mnt_stat.mount_info.msdosfs_args, sizeof(args));
  244 #ifdef MSDOSFS_DEBUG
printf("msdosfs_mount(): mp %x, pmp %x, inusemap %x\n", mp, pmp, pmp->pm_inusemap);
  246 #endif
  247         return (0);
  248 }
  250 int
msdosfs_mountfs(devvp, mp, p, argp)
  252         struct vnode *devvp;
  253         struct mount *mp;
  254         struct proc *p;
  255         struct msdosfs_args *argp;
  256 {
  257         struct msdosfsmount *pmp;
  258         struct buf *bp;
dev_t dev = devvp->v_rdev;
  260         union bootsector *bsp;
  261         struct byte_bpb33 *b33;
  262         struct byte_bpb50 *b50;
  263         struct byte_bpb710 *b710;
  264         extern struct vnode *rootvp;
u_int8_t SecPerClust;
  266         int     ronly, error, bmapsiz;
uint32_t fat_max_clusters;
  269         /*
  270          * Disallow multiple mounts of the same device.
  271          * Disallow mounting of a device that is currently in use
  272          * (except for root, which might share swap device for miniroot).
  273          * Flush out any old buffers remaining from a previous use.
  274          */
  275         if ((error = vfs_mountedon(devvp)) != 0)
  276                 return (error);
  277         if (vcount(devvp) > 1 && devvp != rootvp)
  278                 return (EBUSY);
vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, p);
error = vinvalbuf(devvp, V_SAVE, p->p_ucred, p, 0, 0);
VOP_UNLOCK(devvp, 0, p);
  282         if (error)
  283                 return (error);
ronly = (mp->mnt_flag & MNT_RDONLY) != 0;
error = VOP_OPEN(devvp, ronly ? FREAD : FREAD|FWRITE, FSCRED, p);
  287         if (error)
  288                 return (error);
bp  = NULL; /* both used in error_exit */
pmp = NULL;
  293         /*
  294          * Read the boot sector of the filesystem, and then check the
  295          * boot signature.  If not a dos boot sector then error out.
  296          */
  297         if ((error = bread(devvp, 0, 2048, NOCRED, &bp)) != 0)
  298                 goto error_exit;
bp->b_flags |= B_AGE;
bsp = (union bootsector *)bp->b_data;
b33 = (struct byte_bpb33 *)bsp->bs33.bsBPB;
b50 = (struct byte_bpb50 *)bsp->bs50.bsBPB;
b710 = (struct byte_bpb710 *)bsp->bs710.bsPBP;
pmp = malloc(sizeof *pmp, M_MSDOSFSMNT, M_WAITOK);
bzero((caddr_t)pmp, sizeof *pmp);
pmp->pm_mountp = mp;
  309         /*
  310          * Compute several useful quantities from the bpb in the
  311          * bootsector.  Copy in the dos 5 variant of the bpb then fix up
  312          * the fields that are different between dos 5 and dos 3.3.
  313          */
SecPerClust = b50->bpbSecPerClust;
pmp->pm_BytesPerSec = getushort(b50->bpbBytesPerSec);
pmp->pm_ResSectors = getushort(b50->bpbResSectors);
pmp->pm_FATs = b50->bpbFATs;
pmp->pm_RootDirEnts = getushort(b50->bpbRootDirEnts);
pmp->pm_Sectors = getushort(b50->bpbSectors);
pmp->pm_FATsecs = getushort(b50->bpbFATsecs);
pmp->pm_SecPerTrack = getushort(b50->bpbSecPerTrack);
pmp->pm_Heads = getushort(b50->bpbHeads);
pmp->pm_Media = b50->bpbMedia;
  325         /* Determine the number of DEV_BSIZE blocks in a MSDOSFS sector */
pmp->pm_BlkPerSec = pmp->pm_BytesPerSec / DEV_BSIZE;
  328         if (!pmp->pm_BytesPerSec || !SecPerClust || pmp->pm_SecPerTrack > 63) {
error = EFTYPE;
  330                 goto error_exit;
  331         }
  333         if (pmp->pm_Sectors == 0) {
pmp->pm_HiddenSects = getulong(b50->bpbHiddenSecs);
pmp->pm_HugeSectors = getulong(b50->bpbHugeSectors);
  336         } else {
pmp->pm_HiddenSects = getushort(b33->bpbHiddenSecs);
pmp->pm_HugeSectors = pmp->pm_Sectors;
  339         }
  341         if (pmp->pm_RootDirEnts == 0) {
  342                 if (pmp->pm_Sectors || pmp->pm_FATsecs ||
getushort(b710->bpbFSVers)) {
error = EINVAL;
  345                         goto error_exit;
  346                 }
pmp->pm_fatmask = FAT32_MASK;
pmp->pm_fatmult = 4;
pmp->pm_fatdiv = 1;
pmp->pm_FATsecs = getulong(b710->bpbBigFATsecs);
  351                 if (getushort(b710->bpbExtFlags) & FATMIRROR)
pmp->pm_curfat = getushort(b710->bpbExtFlags) & FATNUM;
  353                 else
pmp->pm_flags |= MSDOSFS_FATMIRROR;
  355         } else
pmp->pm_flags |= MSDOSFS_FATMIRROR;
  358         /*
  359          * More sanity checks:
  360          *      MSDOSFS sectors per cluster: >0 && power of 2
  361          *      MSDOSFS sector size: >= DEV_BSIZE && power of 2
  362          *      HUGE sector count: >0
  363          *      FAT sectors: >0
  364          */
  365         if ((SecPerClust == 0) || (SecPerClust & (SecPerClust - 1)) ||
  366             (pmp->pm_BytesPerSec < DEV_BSIZE) ||
  367             (pmp->pm_BytesPerSec & (pmp->pm_BytesPerSec - 1)) ||
  368             (pmp->pm_HugeSectors == 0) || (pmp->pm_FATsecs == 0)) {
error = EINVAL;
  370                 goto error_exit;
  371         }               
pmp->pm_HugeSectors *= pmp->pm_BlkPerSec;
pmp->pm_HiddenSects *= pmp->pm_BlkPerSec;
pmp->pm_FATsecs *= pmp->pm_BlkPerSec;
pmp->pm_fatblk = pmp->pm_ResSectors * pmp->pm_BlkPerSec;
SecPerClust *= pmp->pm_BlkPerSec;
  379         if (FAT32(pmp)) {
pmp->pm_rootdirblk = getulong(b710->bpbRootClust);
pmp->pm_firstcluster = pmp->pm_fatblk
  382                         + (pmp->pm_FATs * pmp->pm_FATsecs);
pmp->pm_fsinfo = getushort(b710->bpbFSInfo) * pmp->pm_BlkPerSec;
  384         } else {
pmp->pm_rootdirblk = pmp->pm_fatblk +
  386                         (pmp->pm_FATs * pmp->pm_FATsecs);
pmp->pm_rootdirsize = (pmp->pm_RootDirEnts * sizeof(struct direntry)
  388                                        + DEV_BSIZE - 1) / DEV_BSIZE;
pmp->pm_firstcluster = pmp->pm_rootdirblk + pmp->pm_rootdirsize;
  390         }
pmp->pm_nmbrofclusters = (pmp->pm_HugeSectors - pmp->pm_firstcluster) /
SecPerClust;
pmp->pm_maxcluster = pmp->pm_nmbrofclusters + 1;
pmp->pm_fatsize = pmp->pm_FATsecs * DEV_BSIZE;
  397         if (pmp->pm_fatmask == 0) {
  398                 if (pmp->pm_maxcluster
  399                     <= ((CLUST_RSRVD - CLUST_FIRST) & FAT12_MASK)) {
  400                         /*
  401                          * This will usually be a floppy disk. This size makes
  402                          * sure that one fat entry will not be split across
  403                          * multiple blocks.
  404                          */
pmp->pm_fatmask = FAT12_MASK;
pmp->pm_fatmult = 3;
pmp->pm_fatdiv = 2;
  408                 } else {
pmp->pm_fatmask = FAT16_MASK;
pmp->pm_fatmult = 2;
pmp->pm_fatdiv = 1;
  412                 }
  413         }
  414         if (FAT12(pmp))
pmp->pm_fatblocksize = 3 * pmp->pm_BytesPerSec;
  416         else
pmp->pm_fatblocksize = MAXBSIZE;
  419         /*
  420          * We now have the number of sectors in each FAT, so can work
  421          * out how many clusters can be represented in a FAT.  Let's
  422          * make sure the file system doesn't claim to have more clusters
  423          * than this.
  424          *
  425          * We perform the calculation like we do to avoid integer overflow.
  426          *
  427          * This will give us a count of clusters.  They are numbered
  428          * from 0, so the max cluster value is one less than the value
  429          * we end up with.
  430          */
fat_max_clusters = pmp->pm_fatsize / pmp->pm_fatmult;
fat_max_clusters *= pmp->pm_fatdiv;
  433         if (pmp->pm_maxcluster >= fat_max_clusters) {
  434 #ifndef SMALL_KERNEL
printf("msdosfs: reducing max cluster to %d from %d "
  436                     "due to FAT size\n", fat_max_clusters - 1,
pmp->pm_maxcluster);
  438 #endif
pmp->pm_maxcluster = fat_max_clusters - 1;
  440         }
pmp->pm_fatblocksec = pmp->pm_fatblocksize / DEV_BSIZE;
pmp->pm_bnshift = ffs(DEV_BSIZE) - 1;
  445         /*
  446          * Compute mask and shift value for isolating cluster relative byte
  447          * offsets and cluster numbers from a file offset.
  448          */
pmp->pm_bpcluster = SecPerClust * DEV_BSIZE;
pmp->pm_crbomask = pmp->pm_bpcluster - 1;
pmp->pm_cnshift = ffs(pmp->pm_bpcluster) - 1;
  453         /*
  454          * Check for valid cluster size
  455          * must be a power of 2
  456          */
  457         if (pmp->pm_bpcluster ^ (1 << pmp->pm_cnshift)) {
error = EFTYPE;
  459                 goto error_exit;
  460         }
  462         /*
  463          * Release the bootsector buffer.
  464          */
brelse(bp);
bp = NULL;
  468         /*
  469          * Check FSInfo
  470          */
  471         if (pmp->pm_fsinfo) {
  472                 struct fsinfo *fp;
  474                 if ((error = bread(devvp, pmp->pm_fsinfo, fsi_size(pmp),
NOCRED, &bp)) != 0)
  476                         goto error_exit;
fp = (struct fsinfo *)bp->b_data;
  478                 if (!bcmp(fp->fsisig1, "RRaA", 4)
  479                     && !bcmp(fp->fsisig2, "rrAa", 4)
  480                     && !bcmp(fp->fsisig3, "\0\0\125\252", 4)
  481                     && !bcmp(fp->fsisig4, "\0\0\125\252", 4))
pmp->pm_nxtfree = getulong(fp->fsinxtfree);
  483                 else
pmp->pm_fsinfo = 0;
brelse(bp);
bp = NULL;
  487         }
  489         /*
  490          * Check and validate (or perhaps invalidate?) the fsinfo structure? XXX
  491          */
  493         /*
  494          * Allocate memory for the bitmap of allocated clusters, and then
  495          * fill it in.
  496          */
bmapsiz = (pmp->pm_maxcluster + N_INUSEBITS - 1) / N_INUSEBITS;
  498         if (bmapsiz == 0 || SIZE_MAX / bmapsiz < sizeof(*pmp->pm_inusemap)) {
  499                 /* detect multiplicative integer overflow */
error = EINVAL;
  501                 goto error_exit;
  502         }
pmp->pm_inusemap = malloc(bmapsiz * sizeof(*pmp->pm_inusemap),
M_MSDOSFSFAT, M_WAITOK | M_CANFAIL);
  505         if (pmp->pm_inusemap == NULL) {
error = EINVAL;
  507                 goto error_exit;
  508         }
  510         /*
  511          * fillinusemap() needs pm_devvp.
  512          */
pmp->pm_dev = dev;
pmp->pm_devvp = devvp;
  516         /*
  517          * Have the inuse map filled in.
  518          */
  519         if ((error = fillinusemap(pmp)) != 0)
  520                 goto error_exit;
  522         /*
  523          * If they want fat updates to be synchronous then let them suffer
  524          * the performance degradation in exchange for the on disk copy of
  525          * the fat being correct just about all the time.  I suppose this
  526          * would be a good thing to turn on if the kernel is still flakey.
  527          */
  528         if (mp->mnt_flag & MNT_SYNCHRONOUS)
pmp->pm_flags |= MSDOSFSMNT_WAITONFAT;
  531         /*
  532          * Finish up.
  533          */
  534         if (ronly)
pmp->pm_flags |= MSDOSFSMNT_RONLY;
  536         else
pmp->pm_fmod = 1;
mp->mnt_data = (qaddr_t)pmp;
mp->mnt_stat.f_fsid.val[0] = (long)dev;
mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum;
  541 #ifdef QUOTA
  542         /*
  543          * If we ever do quotas for DOS filesystems this would be a place
  544          * to fill in the info in the msdosfsmount structure. You dolt,
  545          * quotas on dos filesystems make no sense because files have no
  546          * owners on dos filesystems. of course there is some empty space
  547          * in the directory entry where we could put uid's and gid's.
  548          */
  549 #endif
devvp->v_specmountpoint = mp;
  552         return (0);
error_exit:
devvp->v_specmountpoint = NULL;
  556         if (bp)
brelse(bp);
  558         (void) VOP_CLOSE(devvp, ronly ? FREAD : FREAD|FWRITE, NOCRED, p);
  559         if (pmp) {
  560                 if (pmp->pm_inusemap)
free(pmp->pm_inusemap, M_MSDOSFSFAT);
free(pmp, M_MSDOSFSMNT);
mp->mnt_data = (qaddr_t)0;
  564         }
  565         return (error);
  566 }
  568 int
msdosfs_start(mp, flags, p)
  570         struct mount *mp;
  571         int flags;
  572         struct proc *p;
  573 {
  575         return (0);
  576 }
  578 /*
  579  * Unmount the filesystem described by mp.
  580  */
  581 int
msdosfs_unmount(mp, mntflags, p)
  583         struct mount *mp;
  584         int mntflags;
  585         struct proc *p;
  586 {
  587         struct msdosfsmount *pmp;
  588         int error, flags;
  589         struct vnode *vp;
flags = 0;
  592         if (mntflags & MNT_FORCE)
flags |= FORCECLOSE;
  594 #ifdef QUOTA
  595 #endif
  596         if ((error = vflush(mp, NULLVP, flags)) != 0)
  597                 return (error);
pmp = VFSTOMSDOSFS(mp);
pmp->pm_devvp->v_specmountpoint = NULL;
vp = pmp->pm_devvp;
  601 #ifdef MSDOSFS_DEBUG
vprint("msdosfs_umount(): just before calling VOP_CLOSE()\n", vp);
  603 #endif
error = VOP_CLOSE(vp,
pmp->pm_flags & MSDOSFSMNT_RONLY ? FREAD : FREAD|FWRITE, NOCRED, p);
vrele(vp);
free(pmp->pm_inusemap, M_MSDOSFSFAT);
free(pmp, M_MSDOSFSMNT);
mp->mnt_data = (qaddr_t)0;
mp->mnt_flag &= ~MNT_LOCAL;
  611         return (error);
  612 }
  614 int
msdosfs_root(mp, vpp)
  616         struct mount *mp;
  617         struct vnode **vpp;
  618 {
  619         struct msdosfsmount *pmp = VFSTOMSDOSFS(mp);
  620         struct denode *ndep;
  621         int error;
  623         if ((error = deget(pmp, MSDOSFSROOT, MSDOSFSROOT_OFS, &ndep)) != 0)
  624                 return (error);
  626 #ifdef MSDOSFS_DEBUG
printf("msdosfs_root(); mp %08x, pmp %08x, ndep %08x, vp %08x\n",
mp, pmp, ndep, DETOV(ndep));
  629 #endif
  631         *vpp = DETOV(ndep);
  632         return (0);
  633 }
  635 int
msdosfs_statfs(mp, sbp, p)
  637         struct mount *mp;
  638         struct statfs *sbp;
  639         struct proc *p;
  640 {
  641         struct msdosfsmount *pmp;
pmp = VFSTOMSDOSFS(mp);
sbp->f_bsize = pmp->pm_bpcluster;
sbp->f_iosize = pmp->pm_bpcluster;
sbp->f_blocks = pmp->pm_nmbrofclusters;
sbp->f_bfree = pmp->pm_freeclustercount;
sbp->f_bavail = pmp->pm_freeclustercount;
sbp->f_files = pmp->pm_RootDirEnts;                     /* XXX */
sbp->f_ffree = 0;       /* what to put in here? */
  651         if (sbp != &mp->mnt_stat) {
bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN);
bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN);
bcopy(&mp->mnt_stat.mount_info.msdosfs_args,
  655                     &sbp->mount_info.msdosfs_args, sizeof(struct msdosfs_args));
  656         }
strncpy(sbp->f_fstypename, mp->mnt_vfc->vfc_name, MFSNAMELEN);
  658         return (0);
  659 }
  662 struct msdosfs_sync_arg {
  663         struct proc *p;
  664         struct ucred *cred;
  665         int allerror;
  666         int waitfor;
  667 };
  669 int
msdosfs_sync_vnode(struct vnode *vp, void *arg)
  671 {
  672         struct msdosfs_sync_arg *msa = arg;
  673         int error;
  674         struct denode *dep;
dep = VTODE(vp);
  677         if (vp->v_type == VNON || 
  678             ((dep->de_flag & (DE_ACCESS | DE_CREATE | DE_UPDATE | DE_MODIFIED)) == 0
  679               && LIST_EMPTY(&vp->v_dirtyblkhd)) ||
msa->waitfor == MNT_LAZY) {
  681                 return (0);
  682         }
  684         if (vget(vp, LK_EXCLUSIVE | LK_NOWAIT, msa->p))
  685                 return (0);
  687         if ((error = VOP_FSYNC(vp, msa->cred, msa->waitfor, msa->p)) != 0)
msa->allerror = error;
VOP_UNLOCK(vp, 0, msa->p);
vrele(vp);
  692         return (0);
  693 }
  696 int
msdosfs_sync(mp, waitfor, cred, p)
  698         struct mount *mp;
  699         int waitfor;
  700         struct ucred *cred;
  701         struct proc *p;
  702 {
  703         struct msdosfsmount *pmp = VFSTOMSDOSFS(mp);
  704         struct msdosfs_sync_arg msa;
  705         int error;
msa.allerror = 0;
msa.p = p;
msa.cred = cred;
msa.waitfor = waitfor;
  712         /*
  713          * If we ever switch to not updating all of the fats all the time,
  714          * this would be the place to update them from the first one.
  715          */
  716         if (pmp->pm_fmod != 0) {
  717                 if (pmp->pm_flags & MSDOSFSMNT_RONLY)
panic("msdosfs_sync: rofs mod");
  719                 else {
  720                         /* update fats here */
  721                 }
  722         }
  723         /*
  724          * Write back each (modified) denode.
  725          */
vfs_mount_foreach_vnode(mp, msdosfs_sync_vnode, &msa);
  728         /*
  729          * Force stale file system control information to be flushed.
  730          */
  731         if (waitfor != MNT_LAZY) {
vn_lock(pmp->pm_devvp, LK_EXCLUSIVE | LK_RETRY, p);
  733                 if ((error = VOP_FSYNC(pmp->pm_devvp, cred, waitfor, p)) != 0)
msa.allerror = error;
VOP_UNLOCK(pmp->pm_devvp, 0, p);
  736         }
  738         return (msa.allerror);
  739 }
  741 int
msdosfs_fhtovp(mp, fhp, vpp)
  743         struct mount *mp;
  744         struct fid *fhp;
  745         struct vnode **vpp;
  746 {
  747         struct msdosfsmount *pmp = VFSTOMSDOSFS(mp);
  748         struct defid *defhp = (struct defid *) fhp;
  749         struct denode *dep;
  750         int error;
error = deget(pmp, defhp->defid_dirclust, defhp->defid_dirofs, &dep);
  753         if (error) {
  754                 *vpp = NULLVP;
  755                 return (error);
  756         }
  757         *vpp = DETOV(dep);
  758         return (0);
  759 }
  761 int
msdosfs_vptofh(vp, fhp)
  763         struct vnode *vp;
  764         struct fid *fhp;
  765 {
  766         struct denode *dep;
  767         struct defid *defhp;
dep = VTODE(vp);
defhp = (struct defid *)fhp;
defhp->defid_len = sizeof(struct defid);
defhp->defid_dirclust = dep->de_dirclust;
defhp->defid_dirofs = dep->de_diroffset;
  774         /* defhp->defid_gen = dep->de_gen; */
  775         return (0);
  776 }
  778 int
msdosfs_check_export(mp, nam, exflagsp, credanonp)
  780         register struct mount *mp;
  781         struct mbuf *nam;
  782         int *exflagsp;
  783         struct ucred **credanonp;
  784 {
  785         register struct netcred *np;
  786         register struct msdosfsmount *pmp = VFSTOMSDOSFS(mp);
  788         /*
  789          * Get the export permission structure for this <mp, client> tuple.
  790          */
np = vfs_export_lookup(mp, &pmp->pm_export, nam);
  792         if (np == NULL)
  793                 return (EACCES);
  795         *exflagsp = np->netc_exflags;
  796         *credanonp = &np->netc_anon;
  797         return (0);
  798 }
  800 #define msdosfs_vget ((int (*)(struct mount *, ino_t, struct vnode **)) \
eopnotsupp)
  803 #define msdosfs_quotactl ((int (*)(struct mount *, int, uid_t, caddr_t, \
  804                                         struct proc *))eopnotsupp)
  806 #define msdosfs_sysctl ((int (*)(int *, u_int, void *, size_t *, void *, \
size_t, struct proc *))eopnotsupp)
  809 const struct vfsops msdosfs_vfsops = {
msdosfs_mount,
msdosfs_start,
msdosfs_unmount,
msdosfs_root,
msdosfs_quotactl,
msdosfs_statfs,
msdosfs_sync,
msdosfs_vget,
msdosfs_fhtovp,
msdosfs_vptofh,
msdosfs_init,
msdosfs_sysctl,
msdosfs_check_export
  823 };