/* $NetBSD: msdosfs_vfsops.c,v 1.127.4.3 2021/02/11 12:59:38 martin 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 __KERNEL_RCSID(0, "$NetBSD: msdosfs_vfsops.c,v 1.127.4.3 2021/02/11 12:59:38 martin Exp $"); #if defined(_KERNEL_OPT) #include "opt_compat_netbsd.h" #endif #include #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 #include #include #include #include MODULE(MODULE_CLASS_VFS, msdos, NULL); #ifdef MSDOSFS_DEBUG #define DPRINTF(fmt, ...) uprintf("%s(): " fmt "\n", __func__, ##__VA_ARGS__) #else #define DPRINTF(fmt, ...) #endif #define GEMDOSFS_BSIZE 512 #define MSDOSFS_NAMEMAX(pmp) \ (pmp)->pm_flags & MSDOSFSMNT_LONGNAME ? WIN_MAXLEN : 12 int msdosfs_mountfs(struct vnode *, struct mount *, struct lwp *, struct msdosfs_args *); static int update_mp(struct mount *, struct msdosfs_args *); MALLOC_JUSTDEFINE(M_MSDOSFSMNT, "MSDOSFS mount", "MSDOS FS mount structure"); MALLOC_JUSTDEFINE(M_MSDOSFSFAT, "MSDOSFS FAT", "MSDOS FS FAT table"); MALLOC_JUSTDEFINE(M_MSDOSFSTMP, "MSDOSFS temp", "MSDOS FS temp. structures"); static struct sysctllog *msdosfs_sysctl_log; extern const struct vnodeopv_desc msdosfs_vnodeop_opv_desc; const struct vnodeopv_desc * const msdosfs_vnodeopv_descs[] = { &msdosfs_vnodeop_opv_desc, NULL, }; struct vfsops msdosfs_vfsops = { .vfs_name = MOUNT_MSDOS, .vfs_min_mount_data = sizeof (struct msdosfs_args), .vfs_mount = msdosfs_mount, .vfs_start = msdosfs_start, .vfs_unmount = msdosfs_unmount, .vfs_root = msdosfs_root, .vfs_quotactl = (void *)eopnotsupp, .vfs_statvfs = msdosfs_statvfs, .vfs_sync = msdosfs_sync, .vfs_vget = msdosfs_vget, .vfs_loadvnode = msdosfs_loadvnode, .vfs_fhtovp = msdosfs_fhtovp, .vfs_vptofh = msdosfs_vptofh, .vfs_init = msdosfs_init, .vfs_reinit = msdosfs_reinit, .vfs_done = msdosfs_done, .vfs_mountroot = msdosfs_mountroot, .vfs_snapshot = (void *)eopnotsupp, .vfs_extattrctl = vfs_stdextattrctl, .vfs_suspendctl = genfs_suspendctl, .vfs_renamelock_enter = genfs_renamelock_enter, .vfs_renamelock_exit = genfs_renamelock_exit, .vfs_fsync = (void *)eopnotsupp, .vfs_opv_descs = msdosfs_vnodeopv_descs }; static int msdos_modcmd(modcmd_t cmd, void *arg) { int error; switch (cmd) { case MODULE_CMD_INIT: error = vfs_attach(&msdosfs_vfsops); if (error != 0) break; sysctl_createv(&msdosfs_sysctl_log, 0, NULL, NULL, CTLFLAG_PERMANENT, CTLTYPE_NODE, "msdosfs", SYSCTL_DESCR("MS-DOS file system"), NULL, 0, NULL, 0, CTL_VFS, 4, CTL_EOL); /* * XXX the "4" above could be dynamic, thereby eliminating one * more instance of the "number to vfs" mapping problem, but * "4" is the order as taken from sys/mount.h */ break; case MODULE_CMD_FINI: error = vfs_detach(&msdosfs_vfsops); if (error != 0) break; sysctl_teardown(&msdosfs_sysctl_log); break; default: error = ENOTTY; break; } return (error); } static int update_mp(struct mount *mp, struct msdosfs_args *argp) { struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); int error; pmp->pm_gid = argp->gid; pmp->pm_uid = argp->uid; pmp->pm_mask = argp->mask & ALLPERMS; pmp->pm_dirmask = argp->dirmask & ALLPERMS; pmp->pm_gmtoff = argp->gmtoff; pmp->pm_flags |= argp->flags & MSDOSFSMNT_MNTOPT; /* * GEMDOS knows nothing about win95 long filenames */ if (pmp->pm_flags & MSDOSFSMNT_GEMDOSFS) pmp->pm_flags |= MSDOSFSMNT_NOWIN95; if (pmp->pm_flags & MSDOSFSMNT_NOWIN95) pmp->pm_flags |= MSDOSFSMNT_SHORTNAME; else if (!(pmp->pm_flags & (MSDOSFSMNT_SHORTNAME | MSDOSFSMNT_LONGNAME))) { struct vnode *rtvp; /* * Try to divine whether to support Win'95 long filenames */ if (FAT32(pmp)) pmp->pm_flags |= MSDOSFSMNT_LONGNAME; else { if ((error = msdosfs_root(mp, &rtvp)) != 0) return error; pmp->pm_flags |= findwin95(VTODE(rtvp)) ? MSDOSFSMNT_LONGNAME : MSDOSFSMNT_SHORTNAME; vput(rtvp); } } mp->mnt_stat.f_namemax = MSDOSFS_NAMEMAX(pmp); return 0; } int msdosfs_mountroot(void) { struct mount *mp; struct lwp *l = curlwp; /* XXX */ int error; struct msdosfs_args args; if (device_class(root_device) != DV_DISK) return (ENODEV); if ((error = vfs_rootmountalloc(MOUNT_MSDOS, "root_device", &mp))) { vrele(rootvp); return (error); } args.flags = MSDOSFSMNT_VERSIONED; args.uid = 0; args.gid = 0; args.mask = 0777; args.version = MSDOSFSMNT_VERSION; args.dirmask = 0777; if ((error = msdosfs_mountfs(rootvp, mp, l, &args)) != 0) { vfs_unbusy(mp); vfs_rele(mp); return (error); } if ((error = update_mp(mp, &args)) != 0) { (void)msdosfs_unmount(mp, 0); vfs_unbusy(mp); vfs_rele(mp); vrele(rootvp); return (error); } mountlist_append(mp); (void)msdosfs_statvfs(mp, &mp->mnt_stat); vfs_unbusy(mp); 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. */ int msdosfs_mount(struct mount *mp, const char *path, void *data, size_t *data_len) { struct lwp *l = curlwp; struct vnode *devvp; /* vnode for blk device to mount */ struct msdosfs_args *args = data; /* holds data from mount request */ /* msdosfs specific mount control block */ struct msdosfsmount *pmp = NULL; int error, flags; mode_t accessmode; if (args == NULL) return EINVAL; if (*data_len < sizeof *args) return EINVAL; if (mp->mnt_flag & MNT_GETARGS) { pmp = VFSTOMSDOSFS(mp); if (pmp == NULL) return EIO; args->fspec = NULL; args->uid = pmp->pm_uid; args->gid = pmp->pm_gid; args->mask = pmp->pm_mask; args->flags = pmp->pm_flags; args->version = MSDOSFSMNT_VERSION; args->dirmask = pmp->pm_dirmask; args->gmtoff = pmp->pm_gmtoff; *data_len = sizeof *args; return 0; } /* * If not versioned (i.e. using old mount_msdos(8)), fill in * the additional structure items with suitable defaults. */ if ((args->flags & MSDOSFSMNT_VERSIONED) == 0) { args->version = 1; args->dirmask = args->mask; } /* * Reset GMT offset for pre-v3 mount structure args. */ if (args->version < 3) args->gmtoff = 0; /* * 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, NULLVP, flags); } if (!error && (mp->mnt_flag & MNT_RELOAD)) /* not yet implemented */ error = EOPNOTSUPP; if (error) { DPRINTF("vflush %d", error); return (error); } if ((pmp->pm_flags & MSDOSFSMNT_RONLY) && (mp->mnt_iflag & IMNT_WANTRDWR)) { /* * If upgrade to read-write by non-root, then verify * that user has necessary permissions on the device. * * Permission to update a mount is checked higher, so * here we presume updating the mount is okay (for * example, as far as securelevel goes) which leaves us * with the normal check. */ devvp = pmp->pm_devvp; vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_MOUNT, KAUTH_REQ_SYSTEM_MOUNT_DEVICE, mp, devvp, KAUTH_ARG(VREAD | VWRITE)); VOP_UNLOCK(devvp); DPRINTF("KAUTH_REQ_SYSTEM_MOUNT_DEVICE %d", error); if (error) return (error); pmp->pm_flags &= ~MSDOSFSMNT_RONLY; } if (args->fspec == NULL) { DPRINTF("missing fspec"); return EINVAL; } } /* * Not an update, or updating the name: look up the name * and verify that it refers to a sensible block device. */ error = namei_simple_user(args->fspec, NSM_FOLLOW_NOEMULROOT, &devvp); if (error != 0) { DPRINTF("namei %d", error); return (error); } if (devvp->v_type != VBLK) { DPRINTF("not block"); vrele(devvp); return (ENOTBLK); } if (bdevsw_lookup(devvp->v_rdev) == NULL) { DPRINTF("no block switch"); vrele(devvp); return (ENXIO); } /* * If mount by non-root, then verify that user has necessary * permissions on the device. */ accessmode = VREAD; if ((mp->mnt_flag & MNT_RDONLY) == 0) accessmode |= VWRITE; vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_MOUNT, KAUTH_REQ_SYSTEM_MOUNT_DEVICE, mp, devvp, KAUTH_ARG(accessmode)); VOP_UNLOCK(devvp); if (error) { DPRINTF("KAUTH_REQ_SYSTEM_MOUNT_DEVICE %d", error); vrele(devvp); return (error); } if ((mp->mnt_flag & MNT_UPDATE) == 0) { int xflags; if (mp->mnt_flag & MNT_RDONLY) xflags = FREAD; else xflags = FREAD|FWRITE; vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); error = VOP_OPEN(devvp, xflags, FSCRED); VOP_UNLOCK(devvp); if (error) { DPRINTF("VOP_OPEN %d", error); goto fail; } error = msdosfs_mountfs(devvp, mp, l, args); if (error) { DPRINTF("msdosfs_mountfs %d", error); vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); (void) VOP_CLOSE(devvp, xflags, NOCRED); VOP_UNLOCK(devvp); goto fail; } #ifdef MSDOSFS_DEBUG /* only needed for the printf below */ pmp = VFSTOMSDOSFS(mp); #endif } else { vrele(devvp); if (devvp != pmp->pm_devvp) { DPRINTF("devvp %p pmp %p", devvp, pmp->pm_devvp); return (EINVAL); /* needs translation */ } } if ((error = update_mp(mp, args)) != 0) { msdosfs_unmount(mp, MNT_FORCE); DPRINTF("update_mp %d", error); return error; } #ifdef MSDOSFS_DEBUG printf("msdosfs_mount(): mp %p, pmp %p, inusemap %p\n", mp, pmp, pmp->pm_inusemap); #endif return set_statvfs_info(path, UIO_USERSPACE, args->fspec, UIO_USERSPACE, mp->mnt_op->vfs_name, mp, l); fail: vrele(devvp); return (error); } int msdosfs_mountfs(struct vnode *devvp, struct mount *mp, struct lwp *l, 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; uint8_t SecPerClust; int ronly, error, BlkPerSec; uint64_t psize; unsigned secsize; u_long fatbytes, fatblocksecs; /* Flush out any old buffers remaining from a previous use. */ if ((error = vinvalbuf(devvp, V_SAVE, l->l_cred, l, 0, 0)) != 0) return (error); ronly = (mp->mnt_flag & MNT_RDONLY) != 0; bp = NULL; /* both used in error_exit */ pmp = NULL; error = getdisksize(devvp, &psize, &secsize); if (error) { if (argp->flags & MSDOSFSMNT_GEMDOSFS) goto error_exit; /* ok, so it failed. we most likely don't need the info */ secsize = DEV_BSIZE; psize = 0; error = 0; } if (secsize < DEV_BSIZE) { DPRINTF("Invalid block secsize (%d < DEV_BSIZE)", secsize); error = EINVAL; goto error_exit; } if (argp->flags & MSDOSFSMNT_GEMDOSFS) { if (secsize != GEMDOSFS_BSIZE) { DPRINTF("Invalid block secsize %d for GEMDOS", secsize); error = EINVAL; goto error_exit; } } /* * Read the boot sector of the filesystem, and then check the * boot signature. If not a dos boot sector then error out. */ if (secsize < sizeof(*b50)) { DPRINTF("50 bootsec %u\n", secsize); error = EINVAL; goto error_exit; } if ((error = bread(devvp, 0, secsize, 0, &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.bsBPB; #if 0 /* * Some FAT partition, for example Raspberry Pi Pico's * USB mass storage, does not have exptected BOOTSIGs. * According to FreeBSD's comment, some PC-9800/9821 * FAT floppy disks have similar problems. */ if (!(argp->flags & MSDOSFSMNT_GEMDOSFS)) { if (bsp->bs50.bsBootSectSig0 != BOOTSIG0 || bsp->bs50.bsBootSectSig1 != BOOTSIG1) { DPRINTF("bootsig0 %d bootsig1 %d", bsp->bs50.bsBootSectSig0, bsp->bs50.bsBootSectSig1); error = EINVAL; goto error_exit; } } #endif 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; if (pmp->pm_Sectors == 0) { pmp->pm_HiddenSects = getulong(b50->bpbHiddenSecs); pmp->pm_HugeSectors = getulong(b50->bpbHugeSectors); } else { if (secsize < sizeof(*b33)) { DPRINTF("33 bootsec %u\n", secsize); error = EINVAL; goto error_exit; } pmp->pm_HiddenSects = getushort(b33->bpbHiddenSecs); pmp->pm_HugeSectors = pmp->pm_Sectors; } /* * Sanity checks, from the FAT specification: * - sectors per cluster: >= 1, power of 2 * - logical sector size: >= 1, power of 2 * - cluster size: <= max FS block size * - number of sectors: >= 1 */ if ((SecPerClust == 0) || !powerof2(SecPerClust) || (pmp->pm_BytesPerSec == 0) || !powerof2(pmp->pm_BytesPerSec) || (SecPerClust * pmp->pm_BytesPerSec > MAXBSIZE) || (pmp->pm_HugeSectors == 0)) { DPRINTF("consistency checks"); error = EINVAL; goto error_exit; } if (!(argp->flags & MSDOSFSMNT_GEMDOSFS) && (pmp->pm_SecPerTrack > 63)) { DPRINTF("SecPerTrack %d", pmp->pm_SecPerTrack); error = EINVAL; goto error_exit; } if (pmp->pm_RootDirEnts == 0) { if (secsize < sizeof(*b710)) { DPRINTF("710 bootsec %u\n", secsize); error = EINVAL; goto error_exit; } unsigned short FSVers = getushort(b710->bpbFSVers); unsigned short ExtFlags = getushort(b710->bpbExtFlags); /* * Some say that bsBootSectSig[23] must be zero, but * Windows does not require this and some digital cameras * do not set these to zero. Therefore, do not insist. */ if (pmp->pm_Sectors || pmp->pm_FATsecs || FSVers) { DPRINTF("Sectors %d FATsecs %lu FSVers %d", pmp->pm_Sectors, pmp->pm_FATsecs, FSVers); error = EINVAL; goto error_exit; } pmp->pm_fatmask = FAT32_MASK; pmp->pm_fatmult = 4; pmp->pm_fatdiv = 1; pmp->pm_FATsecs = getulong(b710->bpbBigFATsecs); /* Mirroring is enabled if the FATMIRROR bit is not set. */ if ((ExtFlags & FATMIRROR) == 0) pmp->pm_flags |= MSDOSFS_FATMIRROR; else pmp->pm_curfat = ExtFlags & FATNUM; } else pmp->pm_flags |= MSDOSFS_FATMIRROR; if (argp->flags & MSDOSFSMNT_GEMDOSFS) { if (FAT32(pmp)) { /* GEMDOS doesn't know FAT32. */ DPRINTF("FAT32 for GEMDOS"); error = EINVAL; goto error_exit; } /* * Check a few values (could do some more): * - logical sector size: >= block size * - number of sectors: <= size of partition */ if ((pmp->pm_BytesPerSec < GEMDOSFS_BSIZE) || (pmp->pm_HugeSectors * (pmp->pm_BytesPerSec / GEMDOSFS_BSIZE) > psize)) { DPRINTF("consistency checks for GEMDOS"); error = EINVAL; goto error_exit; } /* * XXX - Many parts of the msdosfs driver seem to assume that * the number of bytes per logical sector (BytesPerSec) will * always be the same as the number of bytes per disk block * Let's pretend it is. */ BlkPerSec = pmp->pm_BytesPerSec / GEMDOSFS_BSIZE; pmp->pm_BytesPerSec = GEMDOSFS_BSIZE; pmp->pm_HugeSectors *= BlkPerSec; pmp->pm_HiddenSects *= BlkPerSec; pmp->pm_ResSectors *= BlkPerSec; pmp->pm_Sectors *= BlkPerSec; pmp->pm_FATsecs *= BlkPerSec; SecPerClust *= BlkPerSec; } /* Check that fs has nonzero FAT size */ if (pmp->pm_FATsecs == 0) { DPRINTF("FATsecs is 0"); error = EINVAL; goto error_exit; } pmp->pm_fatblk = pmp->pm_ResSectors; if (FAT32(pmp)) { if (secsize < sizeof(*b710)) { DPRINTF("710 bootsec %u\n", secsize); error = EINVAL; goto error_exit; } pmp->pm_rootdirblk = getulong(b710->bpbRootClust); pmp->pm_firstcluster = pmp->pm_fatblk + (pmp->pm_FATs * pmp->pm_FATsecs); pmp->pm_fsinfo = getushort(b710->bpbFSInfo); } else { pmp->pm_rootdirblk = pmp->pm_fatblk + (pmp->pm_FATs * pmp->pm_FATsecs); pmp->pm_rootdirsize = (pmp->pm_RootDirEnts * sizeof(struct direntry) + pmp->pm_BytesPerSec - 1) / pmp->pm_BytesPerSec;/* in sectors */ 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 * pmp->pm_BytesPerSec; if (argp->flags & MSDOSFSMNT_GEMDOSFS) { if (pmp->pm_nmbrofclusters <= (0xff0 - 2)) { 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; } } else 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; } } /* validate cluster count against FAT */ if ((pmp->pm_maxcluster & pmp->pm_fatmask) != pmp->pm_maxcluster) { DPRINTF("maxcluster %lu outside of mask %#lx\n", pmp->pm_maxcluster, pmp->pm_fatmask); error = EINVAL; goto error_exit; } /* validate FAT size */ fatbytes = (pmp->pm_maxcluster+1) * pmp->pm_fatmult / pmp->pm_fatdiv; fatblocksecs = howmany(fatbytes, pmp->pm_BytesPerSec); if (pmp->pm_FATsecs < fatblocksecs) { DPRINTF("FATsecs %lu < real %lu\n", pmp->pm_FATsecs, fatblocksecs); error = EINVAL; goto error_exit; } if (FAT12(pmp)) { /* * limit block size to what is needed to read a FAT block * to not exceed MAXBSIZE */ pmp->pm_fatblocksec = min(3, fatblocksecs); pmp->pm_fatblocksize = pmp->pm_fatblocksec * pmp->pm_BytesPerSec; } else { pmp->pm_fatblocksize = MAXBSIZE; pmp->pm_fatblocksec = pmp->pm_fatblocksize / pmp->pm_BytesPerSec; } pmp->pm_bnshift = ffs(pmp->pm_BytesPerSec) - 1; /* * Compute mask and shift value for isolating cluster relative byte * offsets and cluster numbers from a file offset. */ pmp->pm_bpcluster = SecPerClust * pmp->pm_BytesPerSec; 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)) { DPRINTF("bpcluster %lu cnshift %lu", pmp->pm_bpcluster, pmp->pm_cnshift); error = EINVAL; goto error_exit; } /* * Cluster size must be within limit of MAXBSIZE. * Many FAT filesystems will not have clusters larger than * 32KiB due to limits in Windows versions before Vista. */ if (pmp->pm_bpcluster > MAXBSIZE) { DPRINTF("bpcluster %lu > MAXBSIZE %d", pmp->pm_bpcluster, MAXBSIZE); error = EINVAL; goto error_exit; } /* * Release the bootsector buffer. */ brelse(bp, BC_AGE); bp = NULL; /* * Check FSInfo. */ if (pmp->pm_fsinfo) { struct fsinfo *fp; const int rdsz = roundup(sizeof(*fp), pmp->pm_BytesPerSec); /* * XXX If the fsinfo block is stored on media with * 2KB or larger sectors, is the fsinfo structure * padded at the end or in the middle? */ if ((error = bread(devvp, de_bn2kb(pmp, pmp->pm_fsinfo), rdsz, 0, &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) && !memcmp(fp->fsisig4, "\0\0\125\252", 4)) pmp->pm_nxtfree = getulong(fp->fsinxtfree); else pmp->pm_fsinfo = 0; brelse(bp, 0); bp = NULL; } /* * Check and validate (or perhaps invalidate?) the fsinfo structure? * XXX */ if (pmp->pm_fsinfo) { if ((pmp->pm_nxtfree == 0xffffffffUL) || (pmp->pm_nxtfree > pmp->pm_maxcluster)) pmp->pm_fsinfo = 0; } /* * Allocate memory for the bitmap of allocated clusters, and then * fill it in. */ pmp->pm_inusemap = malloc(((pmp->pm_maxcluster + N_INUSEBITS) / N_INUSEBITS) * sizeof(*pmp->pm_inusemap), M_MSDOSFSFAT, M_WAITOK); /* * fillinusemap() needs pm_devvp. */ pmp->pm_dev = dev; pmp->pm_devvp = devvp; /* * Have the inuse map filled in. */ if ((error = fillinusemap(pmp)) != 0) { DPRINTF("fillinusemap %d", error); 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 = pmp; mp->mnt_stat.f_fsidx.__fsid_val[0] = (long)dev; mp->mnt_stat.f_fsidx.__fsid_val[1] = makefstype(MOUNT_MSDOS); mp->mnt_stat.f_fsid = mp->mnt_stat.f_fsidx.__fsid_val[0]; mp->mnt_stat.f_namemax = MSDOSFS_NAMEMAX(pmp); mp->mnt_flag |= MNT_LOCAL; mp->mnt_dev_bshift = pmp->pm_bnshift; mp->mnt_fs_bshift = pmp->pm_cnshift; /* * 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. */ spec_node_setmountedfs(devvp, mp); return (0); error_exit: if (bp) brelse(bp, BC_AGE); if (pmp) { if (pmp->pm_inusemap) free(pmp->pm_inusemap, M_MSDOSFSFAT); free(pmp, M_MSDOSFSMNT); mp->mnt_data = NULL; } return (error); } int msdosfs_start(struct mount *mp, int flags) { return (0); } /* * Unmount the filesystem described by mp. */ int msdosfs_unmount(struct mount *mp, int mntflags) { struct msdosfsmount *pmp; int error, flags; flags = 0; if (mntflags & MNT_FORCE) flags |= FORCECLOSE; if ((error = vflush(mp, NULLVP, flags)) != 0) return (error); pmp = VFSTOMSDOSFS(mp); if (pmp->pm_devvp->v_type != VBAD) spec_node_setmountedfs(pmp->pm_devvp, NULL); #ifdef MSDOSFS_DEBUG { struct vnode *vp = pmp->pm_devvp; printf("msdosfs_umount(): just before calling VOP_CLOSE()\n"); printf("flag %08x, usecount %d, writecount %d, holdcnt %d\n", vp->v_vflag | vp->v_iflag | vp->v_uflag, vp->v_usecount, vp->v_writecount, vp->v_holdcnt); printf("mount %p, op %p\n", vp->v_mount, vp->v_op); printf("cleanblkhd %p, dirtyblkhd %p, numoutput %d, type %d\n", vp->v_cleanblkhd.lh_first, vp->v_dirtyblkhd.lh_first, vp->v_numoutput, vp->v_type); printf("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); (void) VOP_CLOSE(pmp->pm_devvp, pmp->pm_flags & MSDOSFSMNT_RONLY ? FREAD : FREAD|FWRITE, NOCRED); vput(pmp->pm_devvp); msdosfs_fh_destroy(pmp); free(pmp->pm_inusemap, M_MSDOSFSFAT); free(pmp, M_MSDOSFSMNT); 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); int error; #ifdef MSDOSFS_DEBUG printf("msdosfs_root(); mp %p, pmp %p\n", mp, pmp); #endif if ((error = deget(pmp, MSDOSFSROOT, MSDOSFSROOT_OFS, vpp)) != 0) return error; error = vn_lock(*vpp, LK_EXCLUSIVE); if (error) { vrele(*vpp); *vpp = NULL; return error; } return 0; } int msdosfs_statvfs(struct mount *mp, struct statvfs *sbp) { struct msdosfsmount *pmp; pmp = VFSTOMSDOSFS(mp); sbp->f_bsize = pmp->pm_bpcluster; sbp->f_frsize = sbp->f_bsize; 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_bresvd = 0; sbp->f_files = pmp->pm_RootDirEnts; /* XXX */ sbp->f_ffree = 0; /* what to put in here? */ sbp->f_favail = 0; /* what to put in here? */ sbp->f_fresvd = 0; copy_statvfs_info(sbp, mp); return (0); } struct msdosfs_sync_ctx { int waitfor; }; static bool msdosfs_sync_selector(void *cl, struct vnode *vp) { struct msdosfs_sync_ctx *c = cl; struct denode *dep; KASSERT(mutex_owned(vp->v_interlock)); dep = VTODE(vp); if (c->waitfor == MNT_LAZY || vp->v_type == VNON || dep == NULL || (((dep->de_flag & (DE_ACCESS | DE_CREATE | DE_UPDATE | DE_MODIFIED)) == 0) && (LIST_EMPTY(&vp->v_dirtyblkhd) && UVM_OBJ_IS_CLEAN(&vp->v_uobj)))) return false; return true; } int msdosfs_sync(struct mount *mp, int waitfor, kauth_cred_t cred) { struct vnode *vp; struct vnode_iterator *marker; struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); int error, allerror = 0; struct msdosfs_sync_ctx ctx; /* * 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_vnode_iterator_init(mp, &marker); ctx.waitfor = waitfor; while ((vp = vfs_vnode_iterator_next(marker, msdosfs_sync_selector, &ctx))) { error = vn_lock(vp, LK_EXCLUSIVE); if (error) { vrele(vp); continue; } if ((error = VOP_FSYNC(vp, cred, waitfor == MNT_WAIT ? FSYNC_WAIT : 0, 0, 0)) != 0) allerror = error; vput(vp); } vfs_vnode_iterator_destroy(marker); /* * Force stale file system control information to be flushed. */ vn_lock(pmp->pm_devvp, LK_EXCLUSIVE | LK_RETRY); if ((error = VOP_FSYNC(pmp->pm_devvp, cred, waitfor == MNT_WAIT ? FSYNC_WAIT : 0, 0, 0)) != 0) allerror = error; VOP_UNLOCK(pmp->pm_devvp); return (allerror); } int msdosfs_fhtovp(struct mount *mp, struct fid *fhp, struct vnode **vpp) { struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); struct defid defh; uint32_t gen; int error; if (fhp->fid_len != sizeof(struct defid)) { DPRINTF("fid_len %d %zd", fhp->fid_len, sizeof(struct defid)); return EINVAL; } memcpy(&defh, fhp, sizeof(defh)); error = msdosfs_fh_lookup(pmp, defh.defid_dirclust, defh.defid_dirofs, &gen); if (error == 0 && gen != defh.defid_gen) error = ESTALE; if (error) { *vpp = NULLVP; return error; } error = deget(pmp, defh.defid_dirclust, defh.defid_dirofs, vpp); if (error) { DPRINTF("deget %d", error); *vpp = NULLVP; return error; } error = vn_lock(*vpp, LK_EXCLUSIVE); if (error) { vrele(*vpp); *vpp = NULLVP; return error; } return 0; } int msdosfs_vptofh(struct vnode *vp, struct fid *fhp, size_t *fh_size) { struct msdosfsmount *pmp = VFSTOMSDOSFS(vp->v_mount); struct denode *dep; struct defid defh; int error; if (*fh_size < sizeof(struct defid)) { *fh_size = sizeof(struct defid); return E2BIG; } *fh_size = sizeof(struct defid); dep = VTODE(vp); memset(&defh, 0, sizeof(defh)); defh.defid_len = sizeof(struct defid); defh.defid_dirclust = dep->de_dirclust; defh.defid_dirofs = dep->de_diroffset; error = msdosfs_fh_enter(pmp, dep->de_dirclust, dep->de_diroffset, &defh.defid_gen); if (error == 0) memcpy(fhp, &defh, sizeof(defh)); return error; } int msdosfs_vget(struct mount *mp, ino_t ino, struct vnode **vpp) { return (EOPNOTSUPP); }