1 /* $Id: msdosfsmount.h,v 1.2 1994/09/27 20:42:59 phk Exp $ */ 2 /* $NetBSD: msdosfsmount.h,v 1.7 1994/08/21 18:44:17 ws Exp $ */ 3 4 /*- 5 * Copyright (C) 1994 Wolfgang Solfrank. 6 * Copyright (C) 1994 TooLs GmbH. 7 * All rights reserved. 8 * Original code by Paul Popelka (paulp@uts.amdahl.com) (see below). 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by TooLs GmbH. 21 * 4. The name of TooLs GmbH may not be used to endorse or promote products 22 * derived from this software without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR 25 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 26 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 27 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 28 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 29 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 30 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 31 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 32 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 33 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 34 */ 35 /* 36 * Written by Paul Popelka (paulp@uts.amdahl.com) 37 * 38 * You can do anything you want with this software, just don't say you wrote 39 * it, and don't remove this notice. 40 * 41 * This software is provided "as is". 42 * 43 * The author supplies this software to be publicly redistributed on the 44 * understanding that the author is not responsible for the correct 45 * functioning of this software in any circumstances and is not liable for 46 * any damages caused by this software. 47 * 48 * October 1992 49 */ 50 51 /* 52 * Layout of the mount control block for a msdos file system. 53 */ 54 struct msdosfsmount { 55 struct mount *pm_mountp;/* vfs mount struct for this fs */ 56 dev_t pm_dev; /* block special device mounted */ 57 uid_t pm_mounter; /* uid of the user who mounted the FS */ 58 uid_t pm_uid; /* uid to set as owner of the files */ 59 gid_t pm_gid; /* gid to set as owner of the files */ 60 mode_t pm_mask; /* mask to and with file protection bits */ 61 struct vnode *pm_devvp; /* vnode for block device mntd */ 62 struct bpb50 pm_bpb; /* BIOS parameter blk for this fs */ 63 u_long pm_fatblk; /* block # of first FAT */ 64 u_long pm_rootdirblk; /* block # of root directory */ 65 u_long pm_rootdirsize; /* size in blocks (not clusters) */ 66 u_long pm_firstcluster; /* block number of first cluster */ 67 u_long pm_nmbrofclusters; /* # of clusters in filesystem */ 68 u_long pm_maxcluster; /* maximum cluster number */ 69 u_long pm_freeclustercount; /* number of free clusters */ 70 u_long pm_bnshift; /* shift file offset right this amount to get a block number */ 71 u_long pm_brbomask; /* and a file offset with this mask to get block rel offset */ 72 u_long pm_cnshift; /* shift file offset right this amount to get a cluster number */ 73 u_long pm_crbomask; /* and a file offset with this mask to get cluster rel offset */ 74 u_long pm_bpcluster; /* bytes per cluster */ 75 u_long pm_depclust; /* directory entries per cluster */ 76 u_long pm_fmod; /* ~0 if fs is modified, this can rollover to 0 */ 77 u_long pm_fatblocksize; /* size of fat blocks in bytes */ 78 u_long pm_fatblocksec; /* size of fat blocks in sectors */ 79 u_long pm_fatsize; /* size of fat in bytes */ 80 u_int *pm_inusemap; /* ptr to bitmap of in-use clusters */ 81 char pm_ronly; /* read only if non-zero */ 82 char pm_waitonfat; /* wait for writes of the fat to complt, when 0 use bdwrite, else use bwrite */ 83 struct netexport pm_export; /* export information */ 84 }; 85 86 /* Number of bits in one pm_inusemap item: */ 87 #define N_INUSEBITS (8 * sizeof(u_int)) 88 89 /* 90 * How to compute pm_cnshift and pm_crbomask. 91 * 92 * pm_crbomask = (pm_SectPerClust * pm_BytesPerSect) - 1 93 * if (bytesperclust == * 0) 94 * return EBADBLKSZ; 95 * bit = 1; 96 * for (i = 0; i < 32; i++) { 97 * if (bit & bytesperclust) { 98 * if (bit ^ bytesperclust) 99 * return EBADBLKSZ; 100 * pm_cnshift = * i; 101 * break; 102 * } 103 * bit <<= 1; 104 * } 105 */ 106 107 /* 108 * Shorthand for fields in the bpb contained in the msdosfsmount structure. 109 */ 110 #define pm_BytesPerSec pm_bpb.bpbBytesPerSec 111 #define pm_SectPerClust pm_bpb.bpbSecPerClust 112 #define pm_ResSectors pm_bpb.bpbResSectors 113 #define pm_FATs pm_bpb.bpbFATs 114 #define pm_RootDirEnts pm_bpb.bpbRootDirEnts 115 #define pm_Sectors pm_bpb.bpbSectors 116 #define pm_Media pm_bpb.bpbMedia 117 #define pm_FATsecs pm_bpb.bpbFATsecs 118 #define pm_SecPerTrack pm_bpb.bpbSecPerTrack 119 #define pm_Heads pm_bpb.bpbHeads 120 #define pm_HiddenSects pm_bpb.bpbHiddenSecs 121 #define pm_HugeSectors pm_bpb.bpbHugeSectors 122 123 /* 124 * Map a cluster number into a filesystem relative block number. 125 */ 126 #define cntobn(pmp, cn) \ 127 ((((cn)-CLUST_FIRST) * (pmp)->pm_SectPerClust) + (pmp)->pm_firstcluster) 128 129 /* 130 * Map a filesystem relative block number back into a cluster number. 131 */ 132 #define bntocn(pmp, bn) \ 133 ((((bn) - pmp->pm_firstcluster)/ (pmp)->pm_SectPerClust) + CLUST_FIRST) 134 135 /* 136 * Calculate block number for directory entry in root dir, offset dirofs 137 */ 138 #define roottobn(pmp, dirofs) \ 139 (((dirofs) / (pmp)->pm_depclust) * (pmp)->pm_SectPerClust \ 140 + (pmp)->pm_rootdirblk) 141 142 /* 143 * Calculate block number for directory entry at cluster dirclu, offset 144 * dirofs 145 */ 146 #define detobn(pmp, dirclu, dirofs) \ 147 ((dirclu) == MSDOSFSROOT \ 148 ? roottobn((pmp), (dirofs)) \ 149 : cntobn((pmp), (dirclu))) 150 151 /* 152 * Convert pointer to buffer -> pointer to direntry 153 */ 154 #define bptoep(pmp, bp, dirofs) \ 155 ((struct direntry *)((bp)->b_data) \ 156 + (dirofs) % (pmp)->pm_depclust) 157 158 159 /* 160 * Convert filesize to block number 161 */ 162 #define de_blk(pmp, off) \ 163 ((off) >> (pmp)->pm_cnshift) 164 165 /* 166 * Clusters required to hold size bytes 167 */ 168 #define de_clcount(pmp, size) \ 169 (((size) + (pmp)->pm_bpcluster - 1) >> (pmp)->pm_cnshift) 170 171 /* 172 * Prototypes for MSDOSFS virtual filesystem operations 173 */ 174 int msdosfs_mount __P((struct mount *, char *, caddr_t, struct nameidata *, struct proc *)); 175 int msdosfs_start __P((struct mount *, int, struct proc *)); 176 int msdosfs_unmount __P((struct mount *, int, struct proc *)); 177 int msdosfs_root __P((struct mount *, struct vnode **)); 178 int msdosfs_quotactl __P((struct mount *, int, uid_t, caddr_t, struct proc *)); 179 int msdosfs_statfs __P((struct mount *, struct statfs *, struct proc *)); 180 int msdosfs_sync __P((struct mount *, int, struct ucred *, struct proc *)); 181 int msdosfs_fhtovp __P((struct mount *, struct fid *, struct mbuf *, struct vnode **, int *, struct ucred **)); 182 int msdosfs_vptofh __P((struct vnode *, struct fid *)); 183 int msdosfs_init __P(()); 184 185 int mountmsdosfs __P((struct vnode *devvp, struct mount *mp, struct proc *p)); 186