/* $OpenBSD: msdosfs_vfsops.c,v 1.78 2016/05/22 20:27:04 bluhm Exp $ */ /* $NetBSD: msdosfs_vfsops.c,v 1.48 1997/10/18 02:54:57 briggs Exp $ */ /*- * Copyright (C) 1994, 1995, 1997 Wolfgang Solfrank. * Copyright (C) 1994, 1995, 1997 TooLs GmbH. * All rights reserved. * Original code by Paul Popelka (paulp@uts.amdahl.com) (see below). * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by TooLs GmbH. * 4. The name of TooLs GmbH may not be used to endorse or promote products * derived from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ /* * Written by Paul Popelka (paulp@uts.amdahl.com) * * You can do anything you want with this software, just don't say you wrote * it, and don't remove this notice. * * This software is provided "as is". * * The author supplies this software to be publicly redistributed on the * understanding that the author is not responsible for the correct * functioning of this software in any circumstances and is not liable for * any damages caused by this software. * * October 1992 */ #include #include #include #include #include #include #include #include /* XXX */ /* defines v_rdev */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include int msdosfs_mount(struct mount *, const char *, void *, struct nameidata *, struct proc *); int msdosfs_start(struct mount *, int, struct proc *); int msdosfs_unmount(struct mount *, int, struct proc *); int msdosfs_root(struct mount *, struct vnode **); int msdosfs_statfs(struct mount *, struct statfs *, struct proc *); int msdosfs_sync(struct mount *, int, struct ucred *, struct proc *); int msdosfs_fhtovp(struct mount *, struct fid *, struct vnode **); int msdosfs_vptofh(struct vnode *, struct fid *); int msdosfs_check_export(struct mount *mp, struct mbuf *nam, int *extflagsp, struct ucred **credanonp); int msdosfs_mountfs(struct vnode *, struct mount *, struct proc *, struct msdosfs_args *); int msdosfs_sync_vnode(struct vnode *, void *); /* * mp - path - addr in user space of mount point (ie /usr or whatever) * data - addr in user space of mount params including the name of the block * special file to treat as a filesystem. */ int msdosfs_mount(struct mount *mp, const char *path, void *data, struct nameidata *ndp, struct proc *p) { struct vnode *devvp; /* vnode for blk device to mount */ struct msdosfs_args args; /* will hold data from mount request */ /* msdosfs specific mount control block */ struct msdosfsmount *pmp = NULL; char fname[MNAMELEN]; char fspec[MNAMELEN]; int error, flags; mode_t accessmode; error = copyin(data, &args, sizeof(struct msdosfs_args)); if (error) return (error); /* * If updating, check whether changing from read-only to * read/write; if there is no device name, that's all we do. */ if (mp->mnt_flag & MNT_UPDATE) { pmp = VFSTOMSDOSFS(mp); error = 0; if (!(pmp->pm_flags & MSDOSFSMNT_RONLY) && (mp->mnt_flag & MNT_RDONLY)) { mp->mnt_flag &= ~MNT_RDONLY; VFS_SYNC(mp, MNT_WAIT, p->p_ucred, p); mp->mnt_flag |= MNT_RDONLY; flags = WRITECLOSE; if (mp->mnt_flag & MNT_FORCE) flags |= FORCECLOSE; error = vflush(mp, NULLVP, flags); if (!error) pmp->pm_flags |= MSDOSFSMNT_RONLY; } if (!error && (mp->mnt_flag & MNT_RELOAD)) /* not yet implemented */ error = EOPNOTSUPP; if (error) return (error); if ((pmp->pm_flags & MSDOSFSMNT_RONLY) && (mp->mnt_flag & MNT_WANTRDWR)) { /* * If upgrade to read-write by non-root, then verify * that user has necessary permissions on the device. */ if (suser(p, 0) != 0) { devvp = pmp->pm_devvp; vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, p); error = VOP_ACCESS(devvp, VREAD | VWRITE, p->p_ucred, p); VOP_UNLOCK(devvp, p); if (error) return (error); } pmp->pm_flags &= ~MSDOSFSMNT_RONLY; } if (args.fspec == NULL) { #ifdef __notyet__ /* doesn't work correctly with current mountd XXX */ if (args.flags & MSDOSFSMNT_MNTOPT) { pmp->pm_flags &= ~MSDOSFSMNT_MNTOPT; pmp->pm_flags |= args.flags & MSDOSFSMNT_MNTOPT; if (pmp->pm_flags & MSDOSFSMNT_NOWIN95) pmp->pm_flags |= MSDOSFSMNT_SHORTNAME; } #endif /* * Process export requests. */ return (vfs_export(mp, &pmp->pm_export, &args.export_info)); } } /* * Not an update, or updating the name: look up the name * and verify that it refers to a sensible block device. */ error = copyinstr(args.fspec, fspec, sizeof(fspec), NULL); if (error) goto error; if (disk_map(fspec, fname, sizeof(fname), DM_OPENBLCK) == -1) bcopy(fspec, fname, sizeof(fname)); NDINIT(ndp, LOOKUP, FOLLOW, UIO_SYSSPACE, fname, p); if ((error = namei(ndp)) != 0) goto error; devvp = ndp->ni_vp; if (devvp->v_type != VBLK) { error = ENOTBLK; goto error_devvp; } if (major(devvp->v_rdev) >= nblkdev) { error = ENXIO; goto error_devvp; } /* * If mount by non-root, then verify that user has necessary * permissions on the device. */ if (suser(p, 0) != 0) { accessmode = VREAD; 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); VOP_UNLOCK(devvp, p); if (error) goto error_devvp; } if ((mp->mnt_flag & MNT_UPDATE) == 0) error = msdosfs_mountfs(devvp, mp, p, &args); else { if (devvp != pmp->pm_devvp) error = EINVAL; /* XXX needs translation */ else vrele(devvp); } if (error) goto error_devvp; 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; if (pmp->pm_flags & MSDOSFSMNT_NOWIN95) pmp->pm_flags |= MSDOSFSMNT_SHORTNAME; else if (!(pmp->pm_flags & (MSDOSFSMNT_SHORTNAME | MSDOSFSMNT_LONGNAME))) { struct vnode *rvp; /* * Try to divine whether to support Win'95 long filenames */ if (FAT32(pmp)) pmp->pm_flags |= MSDOSFSMNT_LONGNAME; else { if ((error = msdosfs_root(mp, &rvp)) != 0) { msdosfs_unmount(mp, MNT_FORCE, p); goto error; } pmp->pm_flags |= findwin95(VTODE(rvp)) ? MSDOSFSMNT_LONGNAME : MSDOSFSMNT_SHORTNAME; vput(rvp); } } if (pmp->pm_flags & MSDOSFSMNT_LONGNAME) mp->mnt_stat.f_namemax = WIN_MAXLEN; else mp->mnt_stat.f_namemax = 12; bzero(mp->mnt_stat.f_mntonname, MNAMELEN); strlcpy(mp->mnt_stat.f_mntonname, path, MNAMELEN); bzero(mp->mnt_stat.f_mntfromname, MNAMELEN); strlcpy(mp->mnt_stat.f_mntfromname, fname, MNAMELEN); bzero(mp->mnt_stat.f_mntfromspec, MNAMELEN); strlcpy(mp->mnt_stat.f_mntfromspec, fspec, MNAMELEN); bcopy(&args, &mp->mnt_stat.mount_info.msdosfs_args, sizeof(args)); #ifdef MSDOSFS_DEBUG printf("msdosfs_mount(): mp %p, pmp %p, inusemap %p\n", mp, pmp, pmp->pm_inusemap); #endif return (0); error_devvp: vrele(devvp); error: return (error); } int msdosfs_mountfs(struct vnode *devvp, struct mount *mp, struct proc *p, struct msdosfs_args *argp) { struct msdosfsmount *pmp; struct buf *bp; dev_t dev = devvp->v_rdev; union bootsector *bsp; struct byte_bpb33 *b33; struct byte_bpb50 *b50; struct byte_bpb710 *b710; extern struct vnode *rootvp; u_int8_t SecPerClust; int ronly, error, bmapsiz; uint32_t fat_max_clusters; /* * Disallow multiple mounts of the same device. * Disallow mounting of a device that is currently in use * (except for root, which might share swap device for miniroot). * Flush out any old buffers remaining from a previous use. */ if ((error = vfs_mountedon(devvp)) != 0) return (error); if (vcount(devvp) > 1 && devvp != rootvp) return (EBUSY); vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, p); error = vinvalbuf(devvp, V_SAVE, p->p_ucred, p, 0, 0); VOP_UNLOCK(devvp, p); if (error) return (error); ronly = (mp->mnt_flag & MNT_RDONLY) != 0; error = VOP_OPEN(devvp, ronly ? FREAD : FREAD|FWRITE, FSCRED, p); if (error) return (error); bp = NULL; /* both used in error_exit */ pmp = NULL; /* * Read the boot sector of the filesystem, and then check the * boot signature. If not a dos boot sector then error out. */ if ((error = bread(devvp, 0, 4096, &bp)) != 0) goto error_exit; 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 | M_ZERO); pmp->pm_mountp = mp; /* * Compute several useful quantities from the bpb in the * bootsector. Copy in the dos 5 variant of the bpb then fix up * the fields that are different between dos 5 and dos 3.3. */ 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; /* Determine the number of DEV_BSIZE blocks in a MSDOSFS sector */ pmp->pm_BlkPerSec = pmp->pm_BytesPerSec / DEV_BSIZE; if (!pmp->pm_BytesPerSec || !SecPerClust || pmp->pm_SecPerTrack > 64) { error = EFTYPE; goto error_exit; } if (pmp->pm_Sectors == 0) { pmp->pm_HiddenSects = getulong(b50->bpbHiddenSecs); pmp->pm_HugeSectors = getulong(b50->bpbHugeSectors); } else { pmp->pm_HiddenSects = getushort(b33->bpbHiddenSecs); pmp->pm_HugeSectors = pmp->pm_Sectors; } if (pmp->pm_RootDirEnts == 0) { if (pmp->pm_Sectors || pmp->pm_FATsecs || getushort(b710->bpbFSVers)) { error = EINVAL; goto error_exit; } pmp->pm_fatmask = FAT32_MASK; pmp->pm_fatmult = 4; pmp->pm_fatdiv = 1; pmp->pm_FATsecs = getulong(b710->bpbBigFATsecs); if (getushort(b710->bpbExtFlags) & FATMIRROR) pmp->pm_curfat = getushort(b710->bpbExtFlags) & FATNUM; else pmp->pm_flags |= MSDOSFS_FATMIRROR; } else pmp->pm_flags |= MSDOSFS_FATMIRROR; /* * More sanity checks: * MSDOSFS sectors per cluster: >0 && power of 2 * MSDOSFS sector size: >= DEV_BSIZE && power of 2 * HUGE sector count: >0 * FAT sectors: >0 */ if ((SecPerClust == 0) || (SecPerClust & (SecPerClust - 1)) || (pmp->pm_BytesPerSec < DEV_BSIZE) || (pmp->pm_BytesPerSec & (pmp->pm_BytesPerSec - 1)) || (pmp->pm_HugeSectors == 0) || (pmp->pm_FATsecs == 0) || (SecPerClust * pmp->pm_BlkPerSec > MAXBSIZE / DEV_BSIZE)) { error = EINVAL; goto error_exit; } 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; if (FAT32(pmp)) { pmp->pm_rootdirblk = getulong(b710->bpbRootClust); pmp->pm_firstcluster = pmp->pm_fatblk + (pmp->pm_FATs * pmp->pm_FATsecs); pmp->pm_fsinfo = getushort(b710->bpbFSInfo) * pmp->pm_BlkPerSec; } else { pmp->pm_rootdirblk = pmp->pm_fatblk + (pmp->pm_FATs * pmp->pm_FATsecs); pmp->pm_rootdirsize = (pmp->pm_RootDirEnts * sizeof(struct direntry) + DEV_BSIZE - 1) / DEV_BSIZE; pmp->pm_firstcluster = pmp->pm_rootdirblk + pmp->pm_rootdirsize; } 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; if (pmp->pm_fatmask == 0) { if (pmp->pm_maxcluster <= ((CLUST_RSRVD - CLUST_FIRST) & FAT12_MASK)) { /* * This will usually be a floppy disk. This size makes * sure that one fat entry will not be split across * multiple blocks. */ pmp->pm_fatmask = FAT12_MASK; pmp->pm_fatmult = 3; pmp->pm_fatdiv = 2; } else { pmp->pm_fatmask = FAT16_MASK; pmp->pm_fatmult = 2; pmp->pm_fatdiv = 1; } } if (FAT12(pmp)) pmp->pm_fatblocksize = 3 * pmp->pm_BytesPerSec; else pmp->pm_fatblocksize = MAXBSIZE; /* * We now have the number of sectors in each FAT, so can work * out how many clusters can be represented in a FAT. Let's * make sure the file system doesn't claim to have more clusters * than this. * * We perform the calculation like we do to avoid integer overflow. * * This will give us a count of clusters. They are numbered * from 0, so the max cluster value is one less than the value * we end up with. */ fat_max_clusters = pmp->pm_fatsize / pmp->pm_fatmult; fat_max_clusters *= pmp->pm_fatdiv; if (pmp->pm_maxcluster >= fat_max_clusters) { #ifndef SMALL_KERNEL printf("msdosfs: reducing max cluster to %d from %d " "due to FAT size\n", fat_max_clusters - 1, pmp->pm_maxcluster); #endif pmp->pm_maxcluster = fat_max_clusters - 1; } pmp->pm_fatblocksec = pmp->pm_fatblocksize / DEV_BSIZE; pmp->pm_bnshift = ffs(DEV_BSIZE) - 1; /* * Compute mask and shift value for isolating cluster relative byte * offsets and cluster numbers from a file offset. */ pmp->pm_bpcluster = SecPerClust * DEV_BSIZE; pmp->pm_crbomask = pmp->pm_bpcluster - 1; pmp->pm_cnshift = ffs(pmp->pm_bpcluster) - 1; /* * Check for valid cluster size * must be a power of 2 */ if (pmp->pm_bpcluster ^ (1 << pmp->pm_cnshift)) { error = EFTYPE; goto error_exit; } /* * Release the bootsector buffer. */ brelse(bp); bp = NULL; /* * Check FSInfo */ if (pmp->pm_fsinfo) { struct fsinfo *fp; if ((error = bread(devvp, pmp->pm_fsinfo, fsi_size(pmp), &bp)) != 0) goto error_exit; fp = (struct fsinfo *)bp->b_data; if (!bcmp(fp->fsisig1, "RRaA", 4) && !bcmp(fp->fsisig2, "rrAa", 4) && !bcmp(fp->fsisig3, "\0\0\125\252", 4) && !bcmp(fp->fsisig4, "\0\0\125\252", 4)) /* Valid FSInfo. */ ; else pmp->pm_fsinfo = 0; /* XXX make sure this tiny buf doesn't come back in fillinusemap! */ SET(bp->b_flags, B_INVAL); brelse(bp); bp = NULL; } /* * Check and validate (or perhaps invalidate?) the fsinfo structure? XXX */ /* * Allocate memory for the bitmap of allocated clusters, and then * fill it in. */ bmapsiz = howmany(pmp->pm_maxcluster + 1, N_INUSEBITS); if (bmapsiz == 0 || SIZE_MAX / bmapsiz < sizeof(*pmp->pm_inusemap)) { /* detect multiplicative integer overflow */ error = EINVAL; goto error_exit; } pmp->pm_inusemap = mallocarray(bmapsiz, sizeof(*pmp->pm_inusemap), M_MSDOSFSFAT, M_WAITOK | M_CANFAIL); if (pmp->pm_inusemap == NULL) { error = EINVAL; goto error_exit; } /* * fillinusemap() needs pm_devvp. */ pmp->pm_dev = dev; pmp->pm_devvp = devvp; /* * Have the inuse map filled in. */ if ((error = fillinusemap(pmp)) != 0) goto error_exit; /* * If they want fat updates to be synchronous then let them suffer * the performance degradation in exchange for the on disk copy of * the fat being correct just about all the time. I suppose this * would be a good thing to turn on if the kernel is still flakey. */ if (mp->mnt_flag & MNT_SYNCHRONOUS) pmp->pm_flags |= MSDOSFSMNT_WAITONFAT; /* * Finish up. */ if (ronly) pmp->pm_flags |= MSDOSFSMNT_RONLY; 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; #ifdef QUOTA /* * If we ever do quotas for DOS filesystems this would be a place * to fill in the info in the msdosfsmount structure. You dolt, * quotas on dos filesystems make no sense because files have no * owners on dos filesystems. of course there is some empty space * in the directory entry where we could put uid's and gid's. */ #endif devvp->v_specmountpoint = mp; return (0); error_exit: if (devvp->v_specinfo) devvp->v_specmountpoint = NULL; if (bp) brelse(bp); vn_lock(devvp, LK_EXCLUSIVE|LK_RETRY, p); (void) VOP_CLOSE(devvp, ronly ? FREAD : FREAD|FWRITE, NOCRED, p); VOP_UNLOCK(devvp, p); if (pmp) { if (pmp->pm_inusemap) free(pmp->pm_inusemap, M_MSDOSFSFAT, 0); free(pmp, M_MSDOSFSMNT, 0); mp->mnt_data = NULL; } return (error); } int msdosfs_start(struct mount *mp, int flags, struct proc *p) { return (0); } /* * Unmount the filesystem described by mp. */ int msdosfs_unmount(struct mount *mp, int mntflags,struct proc *p) { struct msdosfsmount *pmp; int error, flags; struct vnode *vp; flags = 0; if (mntflags & MNT_FORCE) flags |= FORCECLOSE; #ifdef QUOTA #endif if ((error = vflush(mp, NULLVP, flags)) != 0) return (error); pmp = VFSTOMSDOSFS(mp); pmp->pm_devvp->v_specmountpoint = NULL; vp = pmp->pm_devvp; #ifdef MSDOSFS_DEBUG vprint("msdosfs_umount(): just before calling VOP_CLOSE()\n", vp); #endif vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p); (void)VOP_CLOSE(vp, pmp->pm_flags & MSDOSFSMNT_RONLY ? FREAD : FREAD|FWRITE, NOCRED, p); vput(vp); free(pmp->pm_inusemap, M_MSDOSFSFAT, 0); free(pmp, M_MSDOSFSMNT, 0); mp->mnt_data = NULL; mp->mnt_flag &= ~MNT_LOCAL; return (0); } int msdosfs_root(struct mount *mp, struct vnode **vpp) { struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); struct denode *ndep; int error; if ((error = deget(pmp, MSDOSFSROOT, MSDOSFSROOT_OFS, &ndep)) != 0) return (error); #ifdef MSDOSFS_DEBUG printf("msdosfs_root(); mp %p, pmp %p, ndep %p, vp %p\n", mp, pmp, ndep, DETOV(ndep)); #endif *vpp = DETOV(ndep); return (0); } int msdosfs_statfs(struct mount *mp, struct statfs *sbp, struct proc *p) { 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 = sbp->f_favail = 0; /* what to put in here? */ copy_statfs_info(sbp, mp); return (0); } struct msdosfs_sync_arg { struct proc *p; struct ucred *cred; int allerror; int waitfor; }; int msdosfs_sync_vnode(struct vnode *vp, void *arg) { struct msdosfs_sync_arg *msa = arg; int error; struct denode *dep; dep = VTODE(vp); if (vp->v_type == VNON || ((dep->de_flag & (DE_ACCESS | DE_CREATE | DE_UPDATE | DE_MODIFIED)) == 0 && LIST_EMPTY(&vp->v_dirtyblkhd)) || msa->waitfor == MNT_LAZY) { return (0); } if (vget(vp, LK_EXCLUSIVE | LK_NOWAIT, msa->p)) return (0); if ((error = VOP_FSYNC(vp, msa->cred, msa->waitfor, msa->p)) != 0) msa->allerror = error; VOP_UNLOCK(vp, msa->p); vrele(vp); return (0); } int msdosfs_sync(struct mount *mp, int waitfor, struct ucred *cred, struct proc *p) { struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); struct msdosfs_sync_arg msa; int error; msa.allerror = 0; msa.p = p; msa.cred = cred; msa.waitfor = waitfor; /* * If we ever switch to not updating all of the fats all the time, * this would be the place to update them from the first one. */ if (pmp->pm_fmod != 0) { if (pmp->pm_flags & MSDOSFSMNT_RONLY) panic("msdosfs_sync: rofs mod"); else { /* update fats here */ } } /* * Write back each (modified) denode. */ vfs_mount_foreach_vnode(mp, msdosfs_sync_vnode, &msa); /* * Force stale file system control information to be flushed. */ if (waitfor != MNT_LAZY) { vn_lock(pmp->pm_devvp, LK_EXCLUSIVE | LK_RETRY, p); if ((error = VOP_FSYNC(pmp->pm_devvp, cred, waitfor, p)) != 0) msa.allerror = error; VOP_UNLOCK(pmp->pm_devvp, p); } return (msa.allerror); } int msdosfs_fhtovp(struct mount *mp, struct fid *fhp, struct vnode **vpp) { struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); struct defid *defhp = (struct defid *) fhp; struct denode *dep; int error; error = deget(pmp, defhp->defid_dirclust, defhp->defid_dirofs, &dep); if (error) { *vpp = NULLVP; return (error); } *vpp = DETOV(dep); return (0); } int msdosfs_vptofh(struct vnode *vp, struct fid *fhp) { struct denode *dep; 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; /* defhp->defid_gen = dep->de_gen; */ return (0); } int msdosfs_check_export(struct mount *mp, struct mbuf *nam, int *exflagsp, struct ucred **credanonp) { struct netcred *np; struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); /* * Get the export permission structure for this tuple. */ np = vfs_export_lookup(mp, &pmp->pm_export, nam); if (np == NULL) return (EACCES); *exflagsp = np->netc_exflags; *credanonp = &np->netc_anon; return (0); } #define msdosfs_vget ((int (*)(struct mount *, ino_t, struct vnode **)) \ eopnotsupp) #define msdosfs_quotactl ((int (*)(struct mount *, int, uid_t, caddr_t, \ struct proc *))eopnotsupp) #define msdosfs_sysctl ((int (*)(int *, u_int, void *, size_t *, void *, \ size_t, struct proc *))eopnotsupp) 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 };