/* $OpenBSD: msdosfsmount.h,v 1.23 2024/05/13 01:15:53 jsg Exp $ */ /* $NetBSD: msdosfsmount.h,v 1.16 1997/10/17 11:24:24 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 */ /* * Layout of the mount control block for a msdos file system. */ struct msdosfsmount { struct mount *pm_mountp;/* vfs mount struct for this fs */ dev_t pm_dev; /* block special device mounted */ uid_t pm_uid; /* uid to set as owner of the files */ gid_t pm_gid; /* gid to set as owner of the files */ mode_t pm_mask; /* mask to and with file protection bits */ struct vnode *pm_devvp; /* vnode for block device mntd */ struct bpb50 pm_bpb; /* BIOS parameter blk for this fs */ uint32_t pm_BlkPerSec; /* # of DEV_BSIZE blocks in MSDOSFS sector */ uint32_t pm_FATsecs; /* actual number of fat sectors */ uint32_t pm_fatblk; /* block # of first FAT */ uint32_t pm_rootdirblk; /* block # (cluster # for FAT32) of root directory number */ uint32_t pm_rootdirsize; /* size in blocks (not clusters) */ uint32_t pm_firstcluster; /* block number of first cluster */ uint32_t pm_nmbrofclusters; /* # of clusters in filesystem */ uint32_t pm_maxcluster; /* maximum cluster number */ uint32_t pm_freeclustercount; /* number of free clusters */ uint32_t pm_cnshift; /* shift file offset right this amount to get a cluster number */ uint32_t pm_crbomask; /* and a file offset with this mask to get cluster rel offset */ uint32_t pm_bnshift; /* shift file offset right this amount to get a block number */ uint32_t pm_bpcluster; /* bytes per cluster */ uint32_t pm_fmod; /* ~0 if fs is modified, this can rollover to 0 */ uint32_t pm_fatblocksize; /* size of fat blocks in bytes */ uint32_t pm_fatblocksec; /* size of fat blocks in sectors */ uint32_t pm_fatsize; /* size of fat in bytes */ uint32_t pm_fatmask; /* mask to use for fat numbers */ uint32_t pm_fsinfo; /* fsinfo block number */ u_int pm_fatmult; /* these 2 values are used in fat */ u_int pm_fatdiv; /* offset computation */ u_int pm_curfat; /* current fat for FAT32 (0 otherwise) */ u_int *pm_inusemap; /* ptr to bitmap of in-use clusters */ u_int pm_flags; /* see below */ struct netexport pm_export; /* export information */ }; /* Byte offset in FAT on filesystem pmp, cluster cn */ #define FATOFS(pmp, cn) ((cn) * (pmp)->pm_fatmult / (pmp)->pm_fatdiv) /* * Mount point flags: */ #if 0 /* Defined in <sys/mount.h> */ #define MSDOSFSMNT_SHORTNAME 0x01 #define MSDOSFSMNT_LONGNAME 0x02 #define MSDOSFSMNT_NOWIN95 0x04 #endif /* All flags above: */ #define MSDOSFSMNT_MNTOPT \ (MSDOSFSMNT_SHORTNAME|MSDOSFSMNT_LONGNAME|MSDOSFSMNT_NOWIN95) #define MSDOSFSMNT_RONLY 0x80000000 /* mounted read-only */ #define MSDOSFSMNT_WAITONFAT 0x40000000 /* mounted synchronous */ #define MSDOSFS_FATMIRROR 0x20000000 /* FAT is mirrored */ #define VFSTOMSDOSFS(mp) ((struct msdosfsmount *)mp->mnt_data) /* Number of bits in one pm_inusemap item: */ #define N_INUSEBITS (8 * sizeof(u_int)) /* * Shorthand for fields in the bpb contained in the msdosfsmount structure. */ #define pm_BytesPerSec pm_bpb.bpbBytesPerSec #define pm_ResSectors pm_bpb.bpbResSectors #define pm_FATs pm_bpb.bpbFATs #define pm_RootDirEnts pm_bpb.bpbRootDirEnts #define pm_Sectors pm_bpb.bpbSectors #define pm_Media pm_bpb.bpbMedia #define pm_SecPerTrack pm_bpb.bpbSecPerTrack #define pm_Heads pm_bpb.bpbHeads #define pm_HiddenSects pm_bpb.bpbHiddenSecs #define pm_HugeSectors pm_bpb.bpbHugeSectors /* * Convert pointer to buffer -> pointer to direntry */ #define bptoep(pmp, bp, dirofs) \ ((struct direntry *)(((bp)->b_data) \ + ((dirofs) & (pmp)->pm_crbomask))) /* * Convert block number to cluster number */ #define de_bn2cn(pmp, bn) \ ((bn) >> ((pmp)->pm_cnshift - (pmp)->pm_bnshift)) /* * Convert cluster number to block number */ #define de_cn2bn(pmp, cn) \ ((cn) << ((pmp)->pm_cnshift - (pmp)->pm_bnshift)) /* * Convert file offset to cluster number */ #define de_cluster(pmp, off) \ ((off) >> (pmp)->pm_cnshift) /* * Clusters required to hold size bytes */ #define de_clcount(pmp, size) \ (((size) + (pmp)->pm_bpcluster - 1) >> (pmp)->pm_cnshift) /* * Convert file offset to block number */ #define de_blk(pmp, off) \ (de_cn2bn(pmp, de_cluster((pmp), (off)))) /* * Convert cluster number to file offset */ #define de_cn2off(pmp, cn) \ ((cn) << (pmp)->pm_cnshift) /* * Convert block number to file offset */ #define de_bn2off(pmp, bn) \ ((bn) << (pmp)->pm_bnshift) /* * Map a cluster number into a filesystem relative block number. */ #define cntobn(pmp, cn) \ (de_cn2bn((pmp), (cn)-CLUST_FIRST) + (pmp)->pm_firstcluster) /* * Calculate block number for directory entry in root dir, offset dirofs */ #define roottobn(pmp, dirofs) \ (de_blk((pmp), (dirofs)) + (pmp)->pm_rootdirblk) /* * Calculate block number for directory entry at cluster dirclu, offset * dirofs */ #define detobn(pmp, dirclu, dirofs) \ ((dirclu) == MSDOSFSROOT \ ? roottobn((pmp), (dirofs)) \ : cntobn((pmp), (dirclu))) /* Calculate size of fsinfo block */ #define fsi_size(pmp) \ (1024 << ((pmp)->pm_BlkPerSec >> 2)) /* * Prototypes for MSDOSFS virtual filesystem operations */ int msdosfs_mount(struct mount *, const char *, void *, struct nameidata *, struct proc *); int msdosfs_start(struct mount *, int, struct proc *); int msdosfs_unmount(struct mount *, int, struct proc *); int msdosfs_root(struct mount *, struct vnode **); int msdosfs_statfs(struct mount *, struct statfs *, struct proc *); int msdosfs_sync(struct mount *, int, int, struct ucred *, struct proc *); int msdosfs_fhtovp(struct mount *, struct fid *, struct vnode **); int msdosfs_vptofh(struct vnode *, struct fid *); int msdosfs_init(struct vfsconf *);
