The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/fs/msdosfs/msdosfsmount.h

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    1 /* $FreeBSD$ */
    2 /*      $NetBSD: msdosfsmount.h,v 1.17 1997/11/17 15:37:07 ws Exp $     */
    3 
    4 /*-
    5  * Copyright (C) 1994, 1995, 1997 Wolfgang Solfrank.
    6  * Copyright (C) 1994, 1995, 1997 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 #ifndef _MSDOSFS_MSDOSFSMOUNT_H_
   52 #define _MSDOSFS_MSDOSFSMOUNT_H_
   53 
   54 #ifdef _KERNEL
   55 
   56 #include <sys/types.h>
   57 #include <sys/lock.h>
   58 #include <sys/lockmgr.h>
   59 #include <sys/tree.h>
   60 
   61 #ifdef MALLOC_DECLARE
   62 MALLOC_DECLARE(M_MSDOSFSMNT);
   63 #endif
   64 
   65 struct msdosfs_fileno;
   66 
   67 /*
   68  * Layout of the mount control block for a msdos filesystem.
   69  */
   70 struct msdosfsmount {
   71         struct mount *pm_mountp;/* vfs mount struct for this fs */
   72         struct g_consumer *pm_cp;
   73         struct bufobj *pm_bo;
   74         uid_t pm_uid;           /* uid to set as owner of the files */
   75         gid_t pm_gid;           /* gid to set as owner of the files */
   76         mode_t pm_mask;         /* mask to and with file protection bits 
   77                                    for files */
   78         mode_t pm_dirmask;      /* mask to and with file protection bits
   79                                    for directories */
   80         struct vnode *pm_devvp; /* vnode for character device mounted */
   81         struct cdev *pm_dev;    /* character device mounted */
   82         struct bpb50 pm_bpb;    /* BIOS parameter blk for this fs */
   83         u_long pm_BlkPerSec;    /* How many DEV_BSIZE blocks fit inside a physical sector */
   84         u_long pm_FATsecs;      /* actual number of fat sectors */
   85         u_long pm_fatblk;       /* block # of first FAT */
   86         u_long pm_rootdirblk;   /* block # (cluster # for FAT32) of root directory number */
   87         u_long pm_rootdirsize;  /* size in blocks (not clusters) */
   88         u_long pm_firstcluster; /* block number of first cluster */
   89         u_long pm_maxcluster;   /* maximum cluster number */
   90         u_long pm_freeclustercount;     /* number of free clusters */
   91         u_long pm_cnshift;      /* shift file offset right this amount to get a cluster number */
   92         u_long pm_crbomask;     /* and a file offset with this mask to get cluster rel offset */
   93         u_long pm_bnshift;      /* shift file offset right this amount to get a block number */
   94         u_long pm_bpcluster;    /* bytes per cluster */
   95         u_long pm_fmod;         /* ~0 if fs is modified, this can rollover to 0 */
   96         u_long pm_fatblocksize; /* size of fat blocks in bytes */
   97         u_long pm_fatblocksec;  /* size of fat blocks in sectors */
   98         u_long pm_fatsize;      /* size of fat in bytes */
   99         u_int32_t pm_fatmask;   /* mask to use for fat numbers */
  100         u_long pm_fsinfo;       /* fsinfo block number */
  101         u_long pm_nxtfree;      /* next place to search for a free cluster */
  102         u_int pm_fatmult;       /* these 2 values are used in fat */
  103         u_int pm_fatdiv;        /*      offset computation */
  104         u_int pm_curfat;        /* current fat for FAT32 (0 otherwise) */
  105         u_int *pm_inusemap;     /* ptr to bitmap of in-use clusters */
  106         uint64_t pm_flags;      /* see below */
  107         void *pm_u2w;   /* Local->Unicode iconv handle */
  108         void *pm_w2u;   /* Unicode->Local iconv handle */
  109         void *pm_u2d;   /* Unicode->DOS iconv handle */
  110         void *pm_d2u;   /* DOS->Local iconv handle */
  111         u_int32_t pm_nfileno;   /* next 32-bit fileno */
  112         RB_HEAD(msdosfs_filenotree, msdosfs_fileno)
  113             pm_filenos; /* 64<->32-bit fileno mapping */
  114         struct lock pm_fatlock; /* lockmgr protecting allocations and rb tree */
  115 };
  116 
  117 /*
  118  * A 64-bit file number and the 32-bit file number to which it is mapped,
  119  * in a red-black tree node.
  120  */
  121 struct msdosfs_fileno {
  122         RB_ENTRY(msdosfs_fileno)        mf_tree;
  123         uint32_t                        mf_fileno32;
  124         uint64_t                        mf_fileno64;
  125 };
  126 
  127 /* Byte offset in FAT on filesystem pmp, cluster cn */
  128 #define FATOFS(pmp, cn) ((cn) * (pmp)->pm_fatmult / (pmp)->pm_fatdiv)
  129 
  130 
  131 #define VFSTOMSDOSFS(mp)        ((struct msdosfsmount *)mp->mnt_data)
  132 
  133 /* Number of bits in one pm_inusemap item: */
  134 #define N_INUSEBITS     (8 * sizeof(u_int))
  135 
  136 /*
  137  * Shorthand for fields in the bpb contained in the msdosfsmount structure.
  138  */
  139 #define pm_BytesPerSec  pm_bpb.bpbBytesPerSec
  140 #define pm_ResSectors   pm_bpb.bpbResSectors
  141 #define pm_FATs         pm_bpb.bpbFATs
  142 #define pm_RootDirEnts  pm_bpb.bpbRootDirEnts
  143 #define pm_Sectors      pm_bpb.bpbSectors
  144 #define pm_Media        pm_bpb.bpbMedia
  145 #define pm_SecPerTrack  pm_bpb.bpbSecPerTrack
  146 #define pm_Heads        pm_bpb.bpbHeads
  147 #define pm_HiddenSects  pm_bpb.bpbHiddenSecs
  148 #define pm_HugeSectors  pm_bpb.bpbHugeSectors
  149 
  150 /*
  151  * Convert pointer to buffer -> pointer to direntry
  152  */
  153 #define bptoep(pmp, bp, dirofs) \
  154         ((struct direntry *)(((bp)->b_data)     \
  155          + ((dirofs) & (pmp)->pm_crbomask)))
  156 
  157 /*
  158  * Convert block number to cluster number
  159  */
  160 #define de_bn2cn(pmp, bn) \
  161         ((bn) >> ((pmp)->pm_cnshift - (pmp)->pm_bnshift))
  162 
  163 /*
  164  * Convert cluster number to block number
  165  */
  166 #define de_cn2bn(pmp, cn) \
  167         ((cn) << ((pmp)->pm_cnshift - (pmp)->pm_bnshift))
  168 
  169 /*
  170  * Convert file offset to cluster number
  171  */
  172 #define de_cluster(pmp, off) \
  173         ((off) >> (pmp)->pm_cnshift)
  174 
  175 /*
  176  * Clusters required to hold size bytes
  177  */
  178 #define de_clcount(pmp, size) \
  179         (((size) + (pmp)->pm_bpcluster - 1) >> (pmp)->pm_cnshift)
  180 
  181 /*
  182  * Convert file offset to block number
  183  */
  184 #define de_blk(pmp, off) \
  185         (de_cn2bn(pmp, de_cluster((pmp), (off))))
  186 
  187 /*
  188  * Convert cluster number to file offset
  189  */
  190 #define de_cn2off(pmp, cn) \
  191         ((cn) << (pmp)->pm_cnshift)
  192 
  193 /*
  194  * Convert block number to file offset
  195  */
  196 #define de_bn2off(pmp, bn) \
  197         ((bn) << (pmp)->pm_bnshift)
  198 /*
  199  * Map a cluster number into a filesystem relative block number.
  200  */
  201 #define cntobn(pmp, cn) \
  202         (de_cn2bn((pmp), (cn)-CLUST_FIRST) + (pmp)->pm_firstcluster)
  203 
  204 /*
  205  * Calculate block number for directory entry in root dir, offset dirofs
  206  */
  207 #define roottobn(pmp, dirofs) \
  208         (de_blk((pmp), (dirofs)) + (pmp)->pm_rootdirblk)
  209 
  210 /*
  211  * Calculate block number for directory entry at cluster dirclu, offset
  212  * dirofs
  213  */
  214 #define detobn(pmp, dirclu, dirofs) \
  215         ((dirclu) == MSDOSFSROOT \
  216          ? roottobn((pmp), (dirofs)) \
  217          : cntobn((pmp), (dirclu)))
  218 
  219 void msdosfs_fileno_init(struct mount *);
  220 void msdosfs_fileno_free(struct mount *);
  221 uint32_t msdosfs_fileno_map(struct mount *, uint64_t);
  222 
  223 #define MSDOSFS_LOCK_MP(pmp) \
  224         lockmgr(&(pmp)->pm_fatlock, LK_EXCLUSIVE, NULL)
  225 #define MSDOSFS_UNLOCK_MP(pmp) \
  226         lockmgr(&(pmp)->pm_fatlock, LK_RELEASE, NULL)
  227 #define MSDOSFS_ASSERT_MP_LOCKED(pmp) \
  228         lockmgr_assert(&(pmp)->pm_fatlock, KA_XLOCKED)
  229 
  230 #endif /* _KERNEL */
  231 
  232 /*
  233  *  Arguments to mount MSDOS filesystems.
  234  */
  235 struct msdosfs_args {
  236         char    *fspec;         /* blocks special holding the fs to mount */
  237         struct  oexport_args export;    /* network export information */
  238         uid_t   uid;            /* uid that owns msdosfs files */
  239         gid_t   gid;            /* gid that owns msdosfs files */
  240         mode_t  mask;           /* file mask to be applied for msdosfs perms */
  241         int     flags;          /* see below */
  242         int     unused1;        /* unused, was version number */
  243         u_int16_t unused2[128]; /* no longer used, was Local->Unicode table */
  244         char    *cs_win;        /* Windows(Unicode) Charset */
  245         char    *cs_dos;        /* DOS Charset */
  246         char    *cs_local;      /* Local Charset */
  247         mode_t  dirmask;        /* dir  mask to be applied for msdosfs perms */
  248 };
  249 
  250 /*
  251  * Msdosfs mount options:
  252  */
  253 #define MSDOSFSMNT_SHORTNAME    1       /* Force old DOS short names only */
  254 #define MSDOSFSMNT_LONGNAME     2       /* Force Win'95 long names */
  255 #define MSDOSFSMNT_NOWIN95      4       /* Completely ignore Win95 entries */
  256 #define MSDOSFSMNT_KICONV       0x10    /* Use libiconv to convert chars */
  257 /* All flags above: */
  258 #define MSDOSFSMNT_MNTOPT \
  259         (MSDOSFSMNT_SHORTNAME|MSDOSFSMNT_LONGNAME|MSDOSFSMNT_NOWIN95 \
  260          |MSDOSFSMNT_KICONV)
  261 #define MSDOSFSMNT_RONLY        0x80000000      /* mounted read-only    */
  262 #define MSDOSFSMNT_WAITONFAT    0x40000000      /* mounted synchronous  */
  263 #define MSDOSFS_FATMIRROR       0x20000000      /* FAT is mirrored */
  264 #define MSDOSFS_LARGEFS         0x10000000      /* perform fileno mapping */
  265 #define MSDOSFS_FSIMOD          0x01000000
  266 
  267 #endif /* !_MSDOSFS_MSDOSFSMOUNT_H_ */

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