diff options
Diffstat (limited to 'usr.sbin/makefs/msdos/msdosfs_vfsops.c')
| -rw-r--r-- | usr.sbin/makefs/msdos/msdosfs_vfsops.c | 384 |
1 files changed, 384 insertions, 0 deletions
diff --git a/usr.sbin/makefs/msdos/msdosfs_vfsops.c b/usr.sbin/makefs/msdos/msdosfs_vfsops.c new file mode 100644 index 000000000000..8b5eac4a4b66 --- /dev/null +++ b/usr.sbin/makefs/msdos/msdosfs_vfsops.c @@ -0,0 +1,384 @@ +/*- + * 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 <sys/cdefs.h> +/* $NetBSD: msdosfs_vfsops.c,v 1.10 2016/01/30 09:59:27 mlelstv Exp $ */ +#include <sys/param.h> +#include <sys/mount.h> + +#include <errno.h> +#include <stdbool.h> +#include <stdio.h> +#include <string.h> +#include <stdlib.h> +#include <util.h> + +#include <fs/msdosfs/bootsect.h> +#include <fs/msdosfs/bpb.h> +#include "msdos/denode.h" +#include <fs/msdosfs/fat.h> +#include <fs/msdosfs/msdosfsmount.h> + +#include <mkfs_msdos.h> + +#include "makefs.h" +#include "msdos.h" + +struct msdosfsmount * +m_msdosfs_mount(struct m_vnode *devvp) +{ + struct msdosfsmount *pmp = NULL; + struct m_buf *bp; + union bootsector *bsp; + struct byte_bpb33 *b33; + struct byte_bpb50 *b50; + struct byte_bpb710 *b710; + uint8_t SecPerClust; + int ronly = 0, error; + unsigned secsize = 512; + + MSDOSFS_DPRINTF(("%s(bread 0)\n", __func__)); + if ((error = bread((void *)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 (bsp->bs50.bsBootSectSig0 != BOOTSIG0 || + bsp->bs50.bsBootSectSig1 != BOOTSIG1) { + MSDOSFS_DPRINTF(("bootsig0 %d bootsig1 %d\n", + bsp->bs50.bsBootSectSig0, + bsp->bs50.bsBootSectSig1)); + error = EINVAL; + goto error_exit; + } + + pmp = ecalloc(1, sizeof(*pmp)); + /* + * 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; + + MSDOSFS_DPRINTF(("%s(BytesPerSec=%u, ResSectors=%u, FATs=%d, " + "RootDirEnts=%u, Sectors=%u, FATsecs=%lu, SecPerTrack=%u, " + "Heads=%u, Media=%u)\n", + __func__, pmp->pm_BytesPerSec, pmp->pm_ResSectors, + pmp->pm_FATs, pmp->pm_RootDirEnts, pmp->pm_Sectors, + pmp->pm_FATsecs, pmp->pm_SecPerTrack, pmp->pm_Heads, + pmp->pm_Media)); + + /* XXX - We should probably check more values here */ + if (!pmp->pm_BytesPerSec || !SecPerClust + || pmp->pm_SecPerTrack > 63) { + MSDOSFS_DPRINTF(("bytespersec %d secperclust %d " + "secpertrack %d\n", pmp->pm_BytesPerSec, + SecPerClust, pmp->pm_SecPerTrack)); + 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; + } + + pmp->pm_flags = 0; + if (pmp->pm_RootDirEnts == 0) { + unsigned short vers = getushort(b710->bpbFSVers); + /* + * 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 || vers) { + MSDOSFS_DPRINTF(("sectors %d fatsecs %lu vers %d\n", + pmp->pm_Sectors, pmp->pm_FATsecs, vers)); + error = EINVAL; + goto error_exit; + } + pmp->pm_fatmask = FAT32_MASK; + pmp->pm_fatmult = 4; + pmp->pm_fatdiv = 1; + pmp->pm_FATsecs = getulong(b710->bpbBigFATsecs); + + /* mirrorring is enabled if the FATMIRROR bit is not set */ + if ((getushort(b710->bpbExtFlags) & FATMIRROR) == 0) + pmp->pm_flags |= MSDOSFS_FATMIRROR; + else + pmp->pm_curfat = getushort(b710->bpbExtFlags) & FATNUM; + } else + pmp->pm_flags |= MSDOSFS_FATMIRROR; + + /* Check that fs has nonzero FAT size */ + if (pmp->pm_FATsecs == 0) { + MSDOSFS_DPRINTF(("FATsecs is 0\n")); + error = EINVAL; + goto error_exit; + } + + 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_maxcluster = ((pmp->pm_HugeSectors - pmp->pm_firstcluster) / + SecPerClust) + 1; + pmp->pm_fatsize = pmp->pm_FATsecs * pmp->pm_BytesPerSec; + + 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; + + 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; + + MSDOSFS_DPRINTF(("%s(fatmask=%lu, fatmult=%u, fatdiv=%u, " + "fatblocksize=%lu, fatblocksec=%lu, bnshift=%lu, pbcluster=%lu, " + "crbomask=%lu, cnshift=%lu)\n", + __func__, (unsigned long)pmp->pm_fatmask, pmp->pm_fatmult, + pmp->pm_fatdiv, pmp->pm_fatblocksize, pmp->pm_fatblocksec, + pmp->pm_bnshift, pmp->pm_bpcluster, pmp->pm_crbomask, + pmp->pm_cnshift)); + /* + * Check for valid cluster size + * must be a power of 2 + */ + if (pmp->pm_bpcluster ^ (1 << pmp->pm_cnshift)) { + MSDOSFS_DPRINTF(("bpcluster %lu cnshift %lu\n", + pmp->pm_bpcluster, 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; + + /* + * 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((void *)devvp, pmp->pm_fsinfo, + pmp->pm_BytesPerSec, 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)) + 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 + */ + 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 = ecalloc(sizeof(*pmp->pm_inusemap), + ((pmp->pm_maxcluster + N_INUSEBITS) / N_INUSEBITS)); + /* + * fillinusemap() needs pm_devvp. + */ + pmp->pm_dev = 0; + pmp->pm_devvp = (void *)devvp; + + /* + * Have the inuse map filled in. + */ + if ((error = fillinusemap(pmp)) != 0) { + MSDOSFS_DPRINTF(("fillinusemap %d\n", error)); + goto error_exit; + } + + /* + * Finish up. + */ + if (ronly) + pmp->pm_flags |= MSDOSFSMNT_RONLY; + else + pmp->pm_fmod = 1; + + /* + * 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. + */ + + return pmp; + +error_exit: + if (bp) + brelse(bp); + if (pmp) { + if (pmp->pm_inusemap) + free(pmp->pm_inusemap); + free(pmp); + } + errno = error; + return NULL; +} + +int +msdosfs_root(struct msdosfsmount *pmp, struct m_vnode *vp) { + struct denode *ndep; + int error; + + *vp = *(struct m_vnode *)pmp->pm_devvp; + if ((error = deget(pmp, MSDOSFSROOT, MSDOSFSROOT_OFS, 0, &ndep)) != 0) { + errno = error; + return -1; + } + vp->v_data = ndep; + return 0; +} + +/* + * If we have an FSInfo block, update it. + */ +int +msdosfs_fsiflush(struct msdosfsmount *pmp) +{ + struct fsinfo *fp; + struct m_buf *bp; + int error; + + if (pmp->pm_fsinfo == 0 || (pmp->pm_flags & MSDOSFS_FSIMOD) == 0) { + error = 0; + goto out; + } + error = bread((void *)pmp->pm_devvp, pmp->pm_fsinfo, + pmp->pm_BytesPerSec, NOCRED, &bp); + if (error != 0) { + brelse(bp); + goto out; + } + fp = (struct fsinfo *)bp->b_data; + putulong(fp->fsinfree, pmp->pm_freeclustercount); + putulong(fp->fsinxtfree, pmp->pm_nxtfree); + pmp->pm_flags &= ~MSDOSFS_FSIMOD; + error = bwrite(bp); + +out: + return (error); +} |