/* $FreeBSD$ */ /* $NetBSD: msdosfs_vfsops.c,v 1.51 1997/11/17 15:36:58 ws Exp $ */ /*- * SPDX-License-Identifier: BSD-4-Clause * * 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 #include #include #include #include #include #include #include #include #include #include #include #include #include extern struct vop_ops msdosfs_vnode_vops; struct iconv_functions *msdosfs_iconv; #define ENCODING_UNICODE "UTF-16BE" #if 1 /*def PC98*/ /* * XXX - The boot signature formatted by NEC PC-98 DOS looks like a * garbage or a random value :-{ * If you want to use that broken-signatured media, define the * following symbol even though PC/AT. * (ex. mount PC-98 DOS formatted FD on PC/AT) */ #define MSDOSFS_NOCHECKSIG #endif MALLOC_DEFINE(M_MSDOSFSMNT, "MSDOSFS mount", "MSDOSFS mount structure"); static MALLOC_DEFINE(M_MSDOSFSFAT, "MSDOSFS FAT", "MSDOSFS file allocation table"); static int mountmsdosfs(struct vnode *devvp, struct mount *mp, struct msdosfs_args *argp); static int msdosfs_root(struct mount *, struct vnode **); static int msdosfs_statfs(struct mount *, struct statfs *, struct ucred *); static int msdosfs_unmount(struct mount *, int); static int update_mp(struct mount *mp, struct msdosfs_args *argp) { struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); int error; char cs_local[ICONV_CSNMAXLEN]; char cs_dos[ICONV_CSNMAXLEN]; pmp->pm_gid = argp->gid; pmp->pm_uid = argp->uid; pmp->pm_mask = argp->mask & ALLPERMS; pmp->pm_dirmask = argp->dirmask & ALLPERMS; pmp->pm_flags |= argp->flags & MSDOSFSMNT_MNTOPT; if (pmp->pm_flags & MSDOSFSMNT_KICONV && msdosfs_iconv) { memcpy(cs_local, argp->cs_local, sizeof(cs_local)); memcpy(cs_dos, argp->cs_dos, sizeof(cs_dos)); kprintf("local: %s dos: %s\n",argp->cs_local, argp->cs_dos); error = msdosfs_iconv->open(cs_local, ENCODING_UNICODE, &pmp->pm_w2u); if(error) return error; error = msdosfs_iconv->open(ENCODING_UNICODE, cs_local, &pmp->pm_u2w); if(error) return error; error = msdosfs_iconv->open(cs_dos, cs_local, &pmp->pm_u2d); if(error) return error; error = msdosfs_iconv->open(cs_local, cs_dos, &pmp->pm_d2u); if(error) return error; } if (pmp->pm_flags & MSDOSFSMNT_NOWIN95) pmp->pm_flags |= MSDOSFSMNT_SHORTNAME; else pmp->pm_flags |= MSDOSFSMNT_LONGNAME; return 0; } /* * 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. */ static int msdosfs_mount(struct mount *mp, char *path, caddr_t data, struct ucred *cred) { 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; size_t size; int error, flags; mode_t accessmode; struct nlookupdata nd; error = copyin(data, (caddr_t)&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)) { flags = WRITECLOSE; if (mp->mnt_flag & MNT_FORCE) flags |= FORCECLOSE; error = vflush(mp, 0, flags); if (error == 0) { devvp = pmp->pm_devvp; vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); VOP_OPEN(devvp, FREAD, FSCRED, NULL); VOP_CLOSE(devvp, FREAD|FWRITE, NULL); vn_unlock(devvp); pmp->pm_flags |= MSDOSFSMNT_RONLY; } } if (!error && (mp->mnt_flag & MNT_RELOAD)) error = EOPNOTSUPP; /* not yet implemented */ if (error) return (error); if ((pmp->pm_flags & MSDOSFSMNT_RONLY) && (mp->mnt_kern_flag & MNTK_WANTRDWR)) { /* * If upgrade to read-write by non-root, then verify * that user has necessary permissions on the device. */ devvp = pmp->pm_devvp; vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); if (cred->cr_uid != 0) { error = VOP_EACCESS(devvp, VREAD | VWRITE, cred); if (error) { vn_unlock(devvp); return (error); } } VOP_OPEN(devvp, FREAD|FWRITE, FSCRED, NULL); VOP_CLOSE(devvp, FREAD, NULL); vn_unlock(devvp); 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)); } } /* * Not an update, or updating the name: look up the name * and verify that it refers to a sensible disk device. */ devvp = NULL; error = nlookup_init(&nd, args.fspec, UIO_USERSPACE, NLC_FOLLOW); if (error == 0) error = nlookup(&nd); if (error == 0) error = cache_vref(&nd.nl_nch, nd.nl_cred, &devvp); nlookup_done(&nd); if (error) return (error); if (!vn_isdisk(devvp, &error)) { vrele(devvp); return (error); } /* * If mount by non-root, then verify that user has necessary * permissions on the device. */ if (cred->cr_uid != 0) { accessmode = VREAD; if ((mp->mnt_flag & MNT_RDONLY) == 0) accessmode |= VWRITE; vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); error = VOP_EACCESS(devvp, accessmode, cred); if (error) { vput(devvp); return (error); } vn_unlock(devvp); } if ((mp->mnt_flag & MNT_UPDATE) == 0) { error = mountmsdosfs(devvp, mp, &args); #ifdef MSDOSFS_DEBUG /* only needed for the kprintf below */ pmp = VFSTOMSDOSFS(mp); #endif } else { if (devvp != pmp->pm_devvp) error = EINVAL; /* XXX needs translation */ else vrele(devvp); } if (error) { vrele(devvp); return (error); } error = update_mp(mp, &args); if (error) { if ((mp->mnt_flag & MNT_UPDATE) == 0) msdosfs_unmount(mp, MNT_FORCE); return error; } copyinstr(args.fspec, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, &size); memset(mp->mnt_stat.f_mntfromname + size, 0, MNAMELEN - size); msdosfs_statfs(mp, &mp->mnt_stat, cred); #ifdef MSDOSFS_DEBUG kprintf("msdosfs_mount(): mp %p, pmp %p, inusemap %p\n", mp, pmp, pmp->pm_inusemap); #endif return (0); } static int mountmsdosfs(struct vnode *devvp, struct mount *mp, struct msdosfs_args *argp) { struct msdosfsmount *pmp; struct buf *bp; cdev_t dev; union bootsector *bsp; struct byte_bpb33 *b33; struct byte_bpb50 *b50; struct byte_bpb710 *b710; uint8_t SecPerClust; u_long clusters; int ronly, error; /* * Disallow multiple mounts of the same device. * Disallow mounting of a device that is currently in use * Flush out any old buffers remaining from a previous use. */ error = vfs_mountedon(devvp); if (error) return (error); if (vcount(devvp) > 0) return (EBUSY); vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); error = vinvalbuf(devvp, V_SAVE, 0, 0); vn_unlock(devvp); if (error) return (error); ronly = (mp->mnt_flag & MNT_RDONLY) != 0; vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); error = VOP_OPEN(devvp, ronly ? FREAD : FREAD|FWRITE, FSCRED, NULL); vn_unlock(devvp); if (error) return (error); dev = devvp->v_rdev; 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. * * NOTE: 8192 is a magic size that works for ffs. */ error = bread(devvp, 0, 8192, &bp); if (error) 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.bsBPB; #ifndef MSDOSFS_NOCHECKSIG if (bsp->bs50.bsBootSectSig0 != BOOTSIG0 || bsp->bs50.bsBootSectSig1 != BOOTSIG1) { error = EINVAL; goto error_exit; } #endif pmp = kmalloc(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); if (pmp->pm_BytesPerSec < DEV_BSIZE) { error = EINVAL; goto error_exit; } 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; /* calculate the ratio of sector size to DEV_BSIZE */ pmp->pm_BlkPerSec = pmp->pm_BytesPerSec / DEV_BSIZE; /* * We don't check pm_Heads nor pm_SecPerTrack, because * these may not be set for EFI file systems. We don't * use these anyway, so we're unaffected if they are * invalid. */ if (!pmp->pm_BytesPerSec || !SecPerClust) { error = EINVAL; 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_FATsecs || getushort(b710->bpbFSVers)) { error = EINVAL; kprintf("mountmsdosfs(): bad FAT32 filesystem\n"); 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; /* * Check a few values (could do some more): * - logical sector size: power of 2, >= block size * - sectors per cluster: power of 2, >= 1 * - number of sectors: >= 1, <= size of partition * - number of FAT sectors: >= 1 */ 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; /* XXX not used? */ pmp->pm_FATsecs *= pmp->pm_BlkPerSec; SecPerClust *= pmp->pm_BlkPerSec; pmp->pm_fatblk = pmp->pm_ResSectors * 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 = howmany(pmp->pm_RootDirEnts * sizeof(struct direntry), DEV_BSIZE); /* in blocks */ pmp->pm_firstcluster = pmp->pm_rootdirblk + pmp->pm_rootdirsize; } pmp->pm_maxcluster = (pmp->pm_HugeSectors - pmp->pm_firstcluster) / SecPerClust + 1; 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; } } clusters = ((pmp->pm_FATsecs * DEV_BSIZE) / pmp->pm_fatmult) * pmp->pm_fatdiv; if (pmp->pm_maxcluster >= clusters) { kprintf("Warning: number of clusters (%ld) exceeds FAT " "capacity (%ld)\n", pmp->pm_maxcluster + 1, clusters); pmp->pm_maxcluster = clusters - 1; } if (FAT12(pmp)) pmp->pm_fatblocksize = 3 * 512; else pmp->pm_fatblocksize = PAGE_SIZE; pmp->pm_fatblocksize = roundup(pmp->pm_fatblocksize, pmp->pm_BytesPerSec); pmp->pm_fatblocksec = pmp->pm_fatblocksize / DEV_BSIZE; pmp->pm_bnshift = DEV_BSHIFT; /* * 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 = EINVAL; goto error_exit; } /* * Release the bootsector buffer. */ bp->b_flags |= B_RELBUF; brelse(bp); bp = NULL; /* * Check the fsinfo sector if we have one. Silently fix up our * in-core copy of fp->fsinxtfree if it is unknown (0xffffffff) * or too large. Ignore fp->fsinfree for now, since we need to * read the entire FAT anyway to fill the inuse map. */ if (pmp->pm_fsinfo) { struct fsinfo *fp; if ((error = bread(devvp, de_bn2doff(pmp, pmp->pm_fsinfo), pmp->pm_BytesPerSec, &bp)) != 0) goto error_exit; fp = (struct fsinfo *)bp->b_data; if (!memcmp(fp->fsisig1, "RRaA", 4) && !memcmp(fp->fsisig2, "rrAa", 4) && !memcmp(fp->fsisig3, "\0\0\125\252", 4)) { pmp->pm_nxtfree = getulong(fp->fsinxtfree); if (pmp->pm_nxtfree > pmp->pm_maxcluster) pmp->pm_nxtfree = CLUST_FIRST; } else pmp->pm_fsinfo = 0; bp->b_flags |= B_RELBUF; brelse(bp); bp = NULL; } /* * Finish initializing pmp->pm_nxtfree (just in case the first few * sectors aren't properly reserved in the FAT). This completes * the fixup for fp->fsinxtfree, and fixes up the zero-initialized * value if there is no fsinfo. We will use pmp->pm_nxtfree * internally even if there is no fsinfo. */ if (pmp->pm_nxtfree < CLUST_FIRST) pmp->pm_nxtfree = CLUST_FIRST; /* * Allocate memory for the bitmap of allocated clusters, and then * fill it in. */ pmp->pm_inusemap = kmalloc(howmany(pmp->pm_maxcluster + 1, N_INUSEBITS) * sizeof(*pmp->pm_inusemap), M_MSDOSFSFAT, M_WAITOK); /* * fillinusemap() needs pm_devvp. */ pmp->pm_devvp = devvp; pmp->pm_dev = dev; /* * Have the inuse map filled in. */ MSDOSFS_LOCK_MP(pmp); error = fillinusemap(pmp); MSDOSFS_UNLOCK_MP(pmp); if (error != 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] = dev2udev(dev); mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum; mp->mnt_flag |= MNT_LOCAL; vfs_add_vnodeops(mp, &msdosfs_vnode_vops, &mp->mnt_vn_norm_ops); dev->si_mountpoint = mp; return (0); error_exit: if (bp) { bp->b_flags |= B_RELBUF; brelse(bp); } vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); VOP_CLOSE(devvp, ronly ? FREAD : FREAD | FWRITE, NULL); vn_unlock(devvp); if (pmp) { if (pmp->pm_inusemap) kfree(pmp->pm_inusemap, M_MSDOSFSFAT); kfree(pmp, M_MSDOSFSMNT); mp->mnt_data = (qaddr_t)0; } return (error); } /* * Unmount the filesystem described by mp. */ static int msdosfs_unmount(struct mount *mp, int mntflags) { struct msdosfsmount *pmp; int error, flags; #ifdef MSDOSFS_DEBUG struct vnode *vp; #endif flags = 0; if (mntflags & MNT_FORCE) flags |= FORCECLOSE; error = vflush(mp, 0, flags); if (error) return error; pmp = VFSTOMSDOSFS(mp); pmp->pm_devvp->v_rdev->si_mountpoint = NULL; if (pmp->pm_flags & MSDOSFSMNT_KICONV && msdosfs_iconv) { if (pmp->pm_w2u) msdosfs_iconv->close(pmp->pm_w2u); if (pmp->pm_u2w) msdosfs_iconv->close(pmp->pm_u2w); if (pmp->pm_d2u) msdosfs_iconv->close(pmp->pm_d2u); if (pmp->pm_u2d) msdosfs_iconv->close(pmp->pm_u2d); } #ifdef MSDOSFS_DEBUG vp = pmp->pm_devvp; kprintf("msdosfs_umount(): just before calling VOP_CLOSE()\n"); kprintf("flag %08x, refcnt 0x%08x, writecount %d, auxrefs 0x%08x\n", vp->v_flag, vp->v_refcnt, vp->v_writecount, vp->v_auxrefs); kprintf("mount %p, op %p\n", vp->v_mount, vp->v_ops); kprintf("mount %p\n", vp->v_mount); kprintf("cleanblkhd %p, dirtyblkhd %p, numoutput %d, type %d\n", RB_ROOT(&vp->v_rbclean_tree), RB_ROOT(&vp->v_rbdirty_tree), bio_track_active(&vp->v_track_write), vp->v_type); kprintf("union %p, tag %d, data[0] %08x, data[1] %08x\n", vp->v_socket, vp->v_tag, ((u_int *)vp->v_data)[0], ((u_int *)vp->v_data)[1]); #endif vn_lock(pmp->pm_devvp, LK_EXCLUSIVE | LK_RETRY); error = VOP_CLOSE(pmp->pm_devvp, pmp->pm_flags & MSDOSFSMNT_RONLY ? FREAD : FREAD | FWRITE, NULL); vn_unlock(pmp->pm_devvp); vrele(pmp->pm_devvp); kfree(pmp->pm_inusemap, M_MSDOSFSFAT); kfree(pmp, M_MSDOSFSMNT); mp->mnt_data = (qaddr_t)0; mp->mnt_flag &= ~MNT_LOCAL; return (error); } static int msdosfs_root(struct mount *mp, struct vnode **vpp) { struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); struct denode *ndep; int error; mprintf("msdosfs_root(); mp %p, pmp %p\n", mp, pmp); error = deget(pmp, MSDOSFSROOT, MSDOSFSROOT_OFS, &ndep); if (error) return (error); *vpp = DETOV(ndep); return (0); } static int msdosfs_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred) { struct msdosfsmount *pmp; pmp = VFSTOMSDOSFS(mp); sbp->f_bsize = pmp->pm_bpcluster; sbp->f_iosize = pmp->pm_bpcluster; sbp->f_blocks = pmp->pm_maxcluster + 1; 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? */ if (sbp != &mp->mnt_stat) { sbp->f_type = mp->mnt_vfc->vfc_typenum; memcpy(sbp->f_mntfromname, mp->mnt_stat.f_mntfromname, MNAMELEN); } strncpy(sbp->f_fstypename, mp->mnt_vfc->vfc_name, MFSNAMELEN); return (0); } struct scaninfo { int rescan; int allerror; int waitfor; }; static int msdosfs_sync_scan(struct mount *mp, struct vnode *vp, void *data); /* * If we have an FSInfo block, update it. */ static int msdosfs_fsiflush(struct msdosfsmount *pmp, int waitfor) { struct fsinfo *fp; struct buf *bp; int error; MSDOSFS_LOCK_MP(pmp); if (pmp->pm_fsinfo == 0 || (pmp->pm_flags & MSDOSFS_FSIMOD) == 0) { error = 0; goto unlock; } error = bread(pmp->pm_devvp, de_bn2doff(pmp, pmp->pm_fsinfo), pmp->pm_BytesPerSec, &bp); if (error != 0) { brelse(bp); goto unlock; } fp = (struct fsinfo *)bp->b_data; putulong(fp->fsinfree, pmp->pm_freeclustercount); putulong(fp->fsinxtfree, pmp->pm_nxtfree); pmp->pm_flags &= ~MSDOSFS_FSIMOD; if (waitfor == MNT_WAIT) error = bwrite(bp); else bawrite(bp); unlock: MSDOSFS_UNLOCK_MP(pmp); return (error); } static int msdosfs_sync(struct mount *mp, int waitfor) { struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); struct scaninfo scaninfo; int error; /* * 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. */ scaninfo.allerror = 0; scaninfo.rescan = 1; while (scaninfo.rescan) { scaninfo.rescan = 0; vmntvnodescan(mp, VMSC_GETVP|VMSC_NOWAIT, NULL, msdosfs_sync_scan, &scaninfo); } /* * Flush filesystem control info. */ if ((waitfor & MNT_LAZY) == 0) { vn_lock(pmp->pm_devvp, LK_EXCLUSIVE | LK_RETRY); if ((error = VOP_FSYNC(pmp->pm_devvp, waitfor, 0)) != 0) scaninfo.allerror = error; vn_unlock(pmp->pm_devvp); } error = msdosfs_fsiflush(pmp, waitfor); if (error != 0) scaninfo.allerror = error; return (scaninfo.allerror); } static int msdosfs_sync_scan(struct mount *mp, struct vnode *vp, void *data) { struct scaninfo *info = data; struct denode *dep; int error; dep = VTODE(vp); if (vp->v_type == VNON || vp->v_type == VBAD || ((dep->de_flag & (DE_ACCESS | DE_CREATE | DE_UPDATE | DE_MODIFIED)) == 0 && (RB_EMPTY(&vp->v_rbdirty_tree) || (info->waitfor & MNT_LAZY)))) { return(0); } if ((error = VOP_FSYNC(vp, info->waitfor, 0)) != 0) info->allerror = error; return(0); } static int msdosfs_fhtovp(struct mount *mp, struct vnode *rootvp, 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); } static int msdosfs_checkexp(struct mount *mp, struct sockaddr *nam, int *exflagsp, struct ucred **credanonp) { struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); struct netcred *np; np = vfs_export_lookup(mp, &pmp->pm_export, nam); if (np == NULL) return (EACCES); *exflagsp = np->netc_exflags; *credanonp = &np->netc_anon; return (0); } static 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); } static struct vfsops msdosfs_vfsops = { .vfs_mount = msdosfs_mount, .vfs_root = msdosfs_root, .vfs_statfs = msdosfs_statfs, .vfs_sync = msdosfs_sync, .vfs_fhtovp = msdosfs_fhtovp, .vfs_checkexp = msdosfs_checkexp, .vfs_vptofh = msdosfs_vptofh, .vfs_init = msdosfs_init, .vfs_uninit = msdosfs_uninit, .vfs_unmount = msdosfs_unmount, }; VFS_SET(msdosfs_vfsops, msdos, 0); MODULE_VERSION(msdos, 1);