diff options
Diffstat (limited to 'sys/fs/msdosfs/msdosfs_vfsops.c')
| -rw-r--r-- | sys/fs/msdosfs/msdosfs_vfsops.c | 994 |
1 files changed, 994 insertions, 0 deletions
diff --git a/sys/fs/msdosfs/msdosfs_vfsops.c b/sys/fs/msdosfs/msdosfs_vfsops.c new file mode 100644 index 0000000..4af4cf3 --- /dev/null +++ b/sys/fs/msdosfs/msdosfs_vfsops.c @@ -0,0 +1,994 @@ +/* $FreeBSD$ */ +/* $NetBSD: msdosfs_vfsops.c,v 1.51 1997/11/17 15:36:58 ws 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 <sys/param.h> +#include <sys/systm.h> +#include <sys/conf.h> +#include <sys/namei.h> +#include <sys/proc.h> +#include <sys/kernel.h> +#include <sys/vnode.h> +#include <sys/mount.h> +#include <sys/buf.h> +#include <sys/fcntl.h> +#include <sys/malloc.h> +#include <sys/stat.h> /* defines ALLPERMS */ +#include <vm/vm_zone.h> + +#include <msdosfs/bpb.h> +#include <msdosfs/bootsect.h> +#include <msdosfs/direntry.h> +#include <msdosfs/denode.h> +#include <msdosfs/msdosfsmount.h> +#include <msdosfs/fat.h> + +MALLOC_DEFINE(M_MSDOSFSMNT, "MSDOSFS mount", "MSDOSFS mount structure"); +static MALLOC_DEFINE(M_MSDOSFSFAT, "MSDOSFS FAT", "MSDOSFS file allocation table"); + +static int update_mp __P((struct mount *mp, struct msdosfs_args *argp)); +static int mountmsdosfs __P((struct vnode *devvp, struct mount *mp, + struct proc *p, struct msdosfs_args *argp)); +static int msdosfs_fhtovp __P((struct mount *, struct fid *, + struct vnode **)); +static int msdosfs_checkexp __P((struct mount *, struct sockaddr *, + int *, struct ucred **)); +static int msdosfs_mount __P((struct mount *, char *, caddr_t, + struct nameidata *, struct proc *)); +static int msdosfs_root __P((struct mount *, struct vnode **)); +static int msdosfs_statfs __P((struct mount *, struct statfs *, + struct proc *)); +static int msdosfs_sync __P((struct mount *, int, struct ucred *, + struct proc *)); +static int msdosfs_unmount __P((struct mount *, int, struct proc *)); +static int msdosfs_vptofh __P((struct vnode *, struct fid *)); + +static int +update_mp(mp, argp) + 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_flags |= argp->flags & MSDOSFSMNT_MNTOPT; + if (pmp->pm_flags & MSDOSFSMNT_U2WTABLE) { + bcopy(argp->u2w, pmp->pm_u2w, sizeof(pmp->pm_u2w)); + bcopy(argp->d2u, pmp->pm_d2u, sizeof(pmp->pm_d2u)); + bcopy(argp->u2d, pmp->pm_u2d, sizeof(pmp->pm_u2d)); + } + if (pmp->pm_flags & MSDOSFSMNT_ULTABLE) { + bcopy(argp->ul, pmp->pm_ul, sizeof(pmp->pm_ul)); + bcopy(argp->lu, pmp->pm_lu, sizeof(pmp->pm_lu)); + } + +#ifndef __FreeBSD__ + /* + * GEMDOS knows nothing (yet) about win95 + */ + if (pmp->pm_flags & MSDOSFSMNT_GEMDOSFS) + pmp->pm_flags |= MSDOSFSMNT_NOWIN95; +#endif + + if (pmp->pm_flags & MSDOSFSMNT_NOWIN95) + pmp->pm_flags |= MSDOSFSMNT_SHORTNAME; + else if (!(pmp->pm_flags & + (MSDOSFSMNT_SHORTNAME | MSDOSFSMNT_LONGNAME))) { + struct vnode *rootvp; + + /* + * Try to divine whether to support Win'95 long filenames + */ + if (FAT32(pmp)) + pmp->pm_flags |= MSDOSFSMNT_LONGNAME; + else { + if ((error = msdosfs_root(mp, &rootvp)) != 0) + return error; + pmp->pm_flags |= findwin95(VTODE(rootvp)) + ? MSDOSFSMNT_LONGNAME + : MSDOSFSMNT_SHORTNAME; + vput(rootvp); + } + } + return 0; +} + +#ifndef __FreeBSD__ +int +msdosfs_mountroot() +{ + register struct mount *mp; + struct proc *p = curproc; /* XXX */ + size_t size; + int error; + struct msdosfs_args args; + + if (root_device->dv_class != DV_DISK) + return (ENODEV); + + /* + * Get vnodes for swapdev and rootdev. + */ + if (bdevvp(rootdev, &rootvp)) + panic("msdosfs_mountroot: can't setup rootvp"); + + mp = malloc((u_long)sizeof(struct mount), M_MOUNT, M_WAITOK); + bzero((char *)mp, (u_long)sizeof(struct mount)); + mp->mnt_op = &msdosfs_vfsops; + mp->mnt_flag = 0; + LIST_INIT(&mp->mnt_vnodelist); + + args.flags = 0; + args.uid = 0; + args.gid = 0; + args.mask = 0777; + + if ((error = mountmsdosfs(rootvp, mp, p, &args)) != 0) { + free(mp, M_MOUNT); + return (error); + } + + if ((error = update_mp(mp, &args)) != 0) { + (void)msdosfs_unmount(mp, 0, p); + free(mp, M_MOUNT); + return (error); + } + + if ((error = vfs_lock(mp)) != 0) { + (void)msdosfs_unmount(mp, 0, p); + free(mp, M_MOUNT); + return (error); + } + + TAILQ_INSERT_TAIL(&mountlist, mp, mnt_list); + mp->mnt_vnodecovered = NULLVP; + (void) copystr("/", mp->mnt_stat.f_mntonname, MNAMELEN - 1, + &size); + bzero(mp->mnt_stat.f_mntonname + size, MNAMELEN - size); + (void) copystr(ROOTNAME, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, + &size); + bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size); + (void)msdosfs_statfs(mp, &mp->mnt_stat, p); + vfs_unlock(mp); + return (0); +} +#endif + +/* + * 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(mp, path, data, ndp, p) + struct mount *mp; + char *path; + caddr_t 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; + size_t size; + int error, flags; + mode_t accessmode; + + error = copyin(data, (caddr_t)&args, sizeof(struct msdosfs_args)); + if (error) + return (error); + if (args.magic != MSDOSFS_ARGSMAGIC) + args.flags = 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) + 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. + */ + 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); + if (error) { + VOP_UNLOCK(devvp, 0, p); + return (error); + } + VOP_UNLOCK(devvp, 0, p); + } + pmp->pm_flags &= ~MSDOSFSMNT_RONLY; + } + if (args.fspec == 0) { +#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 block device. + */ + NDINIT(ndp, LOOKUP, FOLLOW, UIO_USERSPACE, args.fspec, p); + error = namei(ndp); + if (error) + return (error); + devvp = ndp->ni_vp; + NDFREE(ndp, NDF_ONLY_PNBUF); + + if (!vn_isdisk(devvp)) { + vrele(devvp); + return (ENOTBLK); + } + /* + * If mount by non-root, then verify that user has necessary + * permissions on the device. + */ + if (p->p_ucred->cr_uid != 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); + if (error) { + vput(devvp); + return (error); + } + VOP_UNLOCK(devvp, 0, p); + } + if ((mp->mnt_flag & MNT_UPDATE) == 0) { + error = mountmsdosfs(devvp, mp, p, &args); +#ifdef MSDOSFS_DEBUG /* only needed for the printf 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) { + msdosfs_unmount(mp, MNT_FORCE, p); + return error; + } + + (void) copyinstr(path, mp->mnt_stat.f_mntonname, MNAMELEN - 1, &size); + bzero(mp->mnt_stat.f_mntonname + size, MNAMELEN - size); + (void) copyinstr(args.fspec, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, + &size); + bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size); + (void) msdosfs_statfs(mp, &mp->mnt_stat, p); +#ifdef MSDOSFS_DEBUG + printf("msdosfs_mount(): mp %p, pmp %p, inusemap %p\n", mp, pmp, pmp->pm_inusemap); +#endif + return (0); +} + +static int +mountmsdosfs(devvp, mp, p, argp) + 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; +#ifndef __FreeBSD__ + struct partinfo dpart; + int bsize = 0, dtype = 0, tmp; +#endif + union bootsector *bsp; + struct byte_bpb33 *b33; + struct byte_bpb50 *b50; + struct byte_bpb710 *b710; + u_int8_t SecPerClust; + int ronly, error; + + /* + * 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. + */ + error = vfs_mountedon(devvp); + if (error) + 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, 0, p); + if (error) + return (error); + + ronly = (mp->mnt_flag & MNT_RDONLY) != 0; + vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, p); + error = VOP_OPEN(devvp, ronly ? FREAD : FREAD|FWRITE, FSCRED, p); + VOP_UNLOCK(devvp, 0, p); + if (error) + return (error); + + bp = NULL; /* both used in error_exit */ + pmp = NULL; + +#ifndef __FreeBSD__ + if (argp->flags & MSDOSFSMNT_GEMDOSFS) { + /* + * We need the disklabel to calculate the size of a FAT entry + * later on. Also make sure the partition contains a filesystem + * of type FS_MSDOS. This doesn't work for floppies, so we have + * to check for them too. + * + * At least some parts of the msdos fs driver seem to assume + * that the size of a disk block will always be 512 bytes. + * Let's check it... + */ + error = VOP_IOCTL(devvp, DIOCGPART, (caddr_t)&dpart, + FREAD, NOCRED, p); + if (error) + goto error_exit; + tmp = dpart.part->p_fstype; + dtype = dpart.disklab->d_type; + bsize = dpart.disklab->d_secsize; + if (bsize != 512 || (dtype!=DTYPE_FLOPPY && tmp!=FS_MSDOS)) { + error = EINVAL; + goto error_exit; + } + } +#endif + + /* + * Read the boot sector of the filesystem, and then check the + * boot signature. If not a dos boot sector then error out. + */ +#ifdef PC98 + error = bread(devvp, 0, 1024, NOCRED, &bp); +#else + error = bread(devvp, 0, 512, NOCRED, &bp); +#endif + 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.bsPBP; + +#ifndef __FreeBSD__ + if (!(argp->flags & MSDOSFSMNT_GEMDOSFS)) { +#endif +#ifdef PC98 + if ((bsp->bs50.bsBootSectSig0 != BOOTSIG0 + || bsp->bs50.bsBootSectSig1 != BOOTSIG1) + && (bsp->bs50.bsBootSectSig0 != 0 /* PC98 DOS 3.3x */ + || bsp->bs50.bsBootSectSig1 != 0) + && (bsp->bs50.bsBootSectSig0 != 0x90 /* PC98 DOS 5.0 */ + || bsp->bs50.bsBootSectSig1 != 0x3d) + && (bsp->bs50.bsBootSectSig0 != 0x46 /* PC98 DOS 3.3B */ + || bsp->bs50.bsBootSectSig1 != 0xfa)) { +#else + if (bsp->bs50.bsBootSectSig0 != BOOTSIG0 + || bsp->bs50.bsBootSectSig1 != BOOTSIG1) { +#endif + error = EINVAL; + goto error_exit; + } +#ifndef __FreeBSD__ + } +#endif + + pmp = malloc(sizeof *pmp, M_MSDOSFSMNT, M_WAITOK); + bzero((caddr_t)pmp, sizeof *pmp); + 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; + +#ifndef __FreeBSD__ + if (!(argp->flags & MSDOSFSMNT_GEMDOSFS)) { +#endif + /* XXX - We should probably check more values here */ + if (!pmp->pm_BytesPerSec || !SecPerClust + || !pmp->pm_Heads || pmp->pm_Heads > 255 +#ifdef PC98 + || !pmp->pm_SecPerTrack || pmp->pm_SecPerTrack > 255) { +#else + || !pmp->pm_SecPerTrack || pmp->pm_SecPerTrack > 63) { +#endif + error = EINVAL; + goto error_exit; + } +#ifndef __FreeBSD__ + } +#endif + + 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_HugeSectors > 0xffffffff / + (pmp->pm_BytesPerSec / sizeof(struct direntry)) + 1) { + /* + * We cannot deal currently with this size of disk + * due to fileid limitations (see msdosfs_getattr and + * msdosfs_readdir) + */ + error = EINVAL; + printf("mountmsdosfs(): disk too big, sorry\n"); + goto error_exit; + } + + if (pmp->pm_RootDirEnts == 0) { + if (bsp->bs710.bsBootSectSig2 != BOOTSIG2 + || bsp->bs710.bsBootSectSig3 != BOOTSIG3 + || pmp->pm_Sectors + || pmp->pm_FATsecs + || getushort(b710->bpbFSVers)) { + error = EINVAL; + printf("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; + +#ifndef __FreeBSD__ + if (argp->flags & MSDOSFSMNT_GEMDOSFS) { + if (FAT32(pmp)) { + /* + * GEMDOS doesn't know fat32. + */ + error = EINVAL; + goto error_exit; + } + + /* + * 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 + */ + if ( (SecPerClust == 0) + || (SecPerClust & (SecPerClust - 1)) + || (pmp->pm_BytesPerSec < bsize) + || (pmp->pm_BytesPerSec & (pmp->pm_BytesPerSec - 1)) + || (pmp->pm_HugeSectors == 0) + || (pmp->pm_HugeSectors * (pmp->pm_BytesPerSec / bsize) + > dpart.part->p_size) + ) { + error = EINVAL; + goto error_exit; + } + /* + * XXX - Many parts of the msdos fs 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. + */ + tmp = pmp->pm_BytesPerSec / bsize; + pmp->pm_BytesPerSec = bsize; + pmp->pm_HugeSectors *= tmp; + pmp->pm_HiddenSects *= tmp; + pmp->pm_ResSectors *= tmp; + pmp->pm_Sectors *= tmp; + pmp->pm_FATsecs *= tmp; + SecPerClust *= tmp; + } +#endif + pmp->pm_fatblk = pmp->pm_ResSectors; + 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); + } 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; + +#ifndef __FreeBSD__ + if (argp->flags & MSDOSFSMNT_GEMDOSFS) { + if ((pmp->pm_nmbrofclusters <= (0xff0 - 2)) + && ((dtype == DTYPE_FLOPPY) || ((dtype == DTYPE_VNODE) + && ((pmp->pm_Heads == 1) || (pmp->pm_Heads == 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 +#endif + 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 = DFLTBSIZE; + + 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)) { + error = EINVAL; + 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, 1024, NOCRED, &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)) + pmp->pm_nxtfree = getulong(fp->fsinxtfree); + else + pmp->pm_fsinfo = 0; + 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. + */ + pmp->pm_inusemap = malloc(((pmp->pm_maxcluster + N_INUSEBITS - 1) + / 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) + 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; + devvp->v_specmountpoint = mp; + + return 0; + +error_exit: + if (bp) + brelse(bp); + (void) VOP_CLOSE(devvp, ronly ? FREAD : FREAD | FWRITE, NOCRED, p); + if (pmp) { + if (pmp->pm_inusemap) + free(pmp->pm_inusemap, M_MSDOSFSFAT); + free(pmp, M_MSDOSFSMNT); + mp->mnt_data = (qaddr_t)0; + } + return (error); +} + +/* + * Unmount the filesystem described by mp. + */ +static int +msdosfs_unmount(mp, mntflags, p) + struct mount *mp; + int mntflags; + struct proc *p; +{ + struct msdosfsmount *pmp; + int error, flags; + + flags = 0; + if (mntflags & MNT_FORCE) + flags |= FORCECLOSE; + error = vflush(mp, NULLVP, flags); + if (error) + return error; + pmp = VFSTOMSDOSFS(mp); + pmp->pm_devvp->v_specmountpoint = NULL; +#ifdef MSDOSFS_DEBUG + { + struct vnode *vp = pmp->pm_devvp; + + printf("msdosfs_umount(): just before calling VOP_CLOSE()\n"); + printf("flag %08lx, usecount %d, writecount %d, holdcnt %ld\n", + vp->v_flag, vp->v_usecount, vp->v_writecount, vp->v_holdcnt); + printf("id %lu, mount %p, op %p\n", + vp->v_id, vp->v_mount, vp->v_op); + printf("freef %p, freeb %p, mount %p\n", + vp->v_freelist.tqe_next, vp->v_freelist.tqe_prev, + vp->v_mount); + printf("cleanblkhd %p, dirtyblkhd %p, numoutput %ld, type %d\n", + TAILQ_FIRST(&vp->v_cleanblkhd), + TAILQ_FIRST(&vp->v_dirtyblkhd), + 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 + error = VOP_CLOSE(pmp->pm_devvp, + (pmp->pm_flags&MSDOSFSMNT_RONLY) ? FREAD : FREAD | FWRITE, + NOCRED, p); + vrele(pmp->pm_devvp); + free(pmp->pm_inusemap, M_MSDOSFSFAT); + free(pmp, M_MSDOSFSMNT); + mp->mnt_data = (qaddr_t)0; + mp->mnt_flag &= ~MNT_LOCAL; + return (error); +} + +static int +msdosfs_root(mp, vpp) + struct mount *mp; + struct vnode **vpp; +{ + struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); + struct denode *ndep; + int error; + +#ifdef MSDOSFS_DEBUG + printf("msdosfs_root(); mp %p, pmp %p\n", mp, pmp); +#endif + error = deget(pmp, MSDOSFSROOT, MSDOSFSROOT_OFS, &ndep); + if (error) + return (error); + *vpp = DETOV(ndep); + return (0); +} + +static int +msdosfs_statfs(mp, sbp, p) + 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 = 0; /* what to put in here? */ + if (sbp != &mp->mnt_stat) { + sbp->f_type = mp->mnt_vfc->vfc_typenum; + bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN); + bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN); + } + strncpy(sbp->f_fstypename, mp->mnt_vfc->vfc_name, MFSNAMELEN); + return (0); +} + +static int +msdosfs_sync(mp, waitfor, cred, p) + struct mount *mp; + int waitfor; + struct ucred *cred; + struct proc *p; +{ + struct vnode *vp, *nvp; + struct denode *dep; + struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); + int error, allerror = 0; + + /* + * 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. + */ + simple_lock(&mntvnode_slock); +loop: + for (vp = mp->mnt_vnodelist.lh_first; vp != NULL; vp = nvp) { + /* + * If the vnode that we are about to sync is no longer + * associated with this mount point, start over. + */ + if (vp->v_mount != mp) + goto loop; + + simple_lock(&vp->v_interlock); + nvp = vp->v_mntvnodes.le_next; + dep = VTODE(vp); + if (vp->v_type == VNON || + ((dep->de_flag & + (DE_ACCESS | DE_CREATE | DE_UPDATE | DE_MODIFIED)) == 0 && + (TAILQ_EMPTY(&vp->v_dirtyblkhd) || waitfor == MNT_LAZY))) { + simple_unlock(&vp->v_interlock); + continue; + } + simple_unlock(&mntvnode_slock); + error = vget(vp, LK_EXCLUSIVE | LK_NOWAIT | LK_INTERLOCK, p); + if (error) { + simple_lock(&mntvnode_slock); + if (error == ENOENT) + goto loop; + continue; + } + error = VOP_FSYNC(vp, cred, waitfor, p); + if (error) + allerror = error; + VOP_UNLOCK(vp, 0, p); + vrele(vp); + simple_lock(&mntvnode_slock); + } + simple_unlock(&mntvnode_slock); + + /* + * Flush filesystem control info. + */ + if (waitfor != MNT_LAZY) { + vn_lock(pmp->pm_devvp, LK_EXCLUSIVE | LK_RETRY, p); + error = VOP_FSYNC(pmp->pm_devvp, cred, waitfor, p); + if (error) + allerror = error; + VOP_UNLOCK(pmp->pm_devvp, 0, p); + } + return (allerror); +} + +static int +msdosfs_fhtovp(mp, fhp, vpp) + 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); +} + +static int +msdosfs_checkexp(mp, nam, exflagsp, credanonp) + 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(vp, fhp) + 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 = { + msdosfs_mount, + vfs_stdstart, + msdosfs_unmount, + msdosfs_root, + vfs_stdquotactl, + msdosfs_statfs, + msdosfs_sync, + vfs_stdvget, + msdosfs_fhtovp, + msdosfs_checkexp, + msdosfs_vptofh, + msdosfs_init, + vfs_stduninit, + vfs_stdextattrctl, +}; + +VFS_SET(msdosfs_vfsops, msdos, 0); |
