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Annotation of src/sys/fs/msdosfs/msdosfsmount.h, Revision 1.5

1.5     ! yamt        1: /*     $NetBSD: msdosfsmount.h,v 1.4 2003/09/07 22:09:11 itojun Exp $  */
1.1       jdolecek    2:
                      3: /*-
                      4:  * Copyright (C) 1994, 1995, 1997 Wolfgang Solfrank.
                      5:  * Copyright (C) 1994, 1995, 1997 TooLs GmbH.
                      6:  * All rights reserved.
                      7:  * Original code by Paul Popelka (paulp@uts.amdahl.com) (see below).
                      8:  *
                      9:  * Redistribution and use in source and binary forms, with or without
                     10:  * modification, are permitted provided that the following conditions
                     11:  * are met:
                     12:  * 1. Redistributions of source code must retain the above copyright
                     13:  *    notice, this list of conditions and the following disclaimer.
                     14:  * 2. Redistributions in binary form must reproduce the above copyright
                     15:  *    notice, this list of conditions and the following disclaimer in the
                     16:  *    documentation and/or other materials provided with the distribution.
                     17:  * 3. All advertising materials mentioning features or use of this software
                     18:  *    must display the following acknowledgement:
                     19:  *     This product includes software developed by TooLs GmbH.
                     20:  * 4. The name of TooLs GmbH may not be used to endorse or promote products
                     21:  *    derived from this software without specific prior written permission.
                     22:  *
                     23:  * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR
                     24:  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
                     25:  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
                     26:  * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
                     27:  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
                     28:  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
                     29:  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
                     30:  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
                     31:  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
                     32:  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
                     33:  */
                     34: /*
                     35:  * Written by Paul Popelka (paulp@uts.amdahl.com)
                     36:  *
                     37:  * You can do anything you want with this software, just don't say you wrote
                     38:  * it, and don't remove this notice.
                     39:  *
                     40:  * This software is provided "as is".
                     41:  *
                     42:  * The author supplies this software to be publicly redistributed on the
                     43:  * understanding that the author is not responsible for the correct
                     44:  * functioning of this software in any circumstances and is not liable for
                     45:  * any damages caused by this software.
                     46:  *
                     47:  * October 1992
                     48:  */
                     49:
                     50: /*
                     51:  *  Arguments to mount MSDOS filesystems.
                     52:  */
                     53: struct msdosfs_args {
                     54:        char    *fspec;         /* blocks special holding the fs to mount */
                     55:        struct  export_args export;     /* network export information */
                     56:        uid_t   uid;            /* uid that owns msdosfs files */
                     57:        gid_t   gid;            /* gid that owns msdosfs files */
                     58:        mode_t  mask;           /* mask to be applied for msdosfs perms */
1.4       itojun     59:        int     gmtoff;         /* offset from UTC in seconds */
1.1       jdolecek   60:        int     flags;          /* see below */
1.3       jdolecek   61:
                     62:        /* Following items added after versioning support */
                     63:        int     version;        /* version of the struct */
                     64: #define MSDOSFSMNT_VERSION     2
                     65:        mode_t  dirmask;        /* v2: mask to be applied for msdosfs perms */
1.1       jdolecek   66: };
                     67:
                     68: /*
                     69:  * Msdosfs mount options:
                     70:  */
                     71: #define        MSDOSFSMNT_SHORTNAME    1       /* Force old DOS short names only */
                     72: #define        MSDOSFSMNT_LONGNAME     2       /* Force Win'95 long names */
                     73: #define        MSDOSFSMNT_NOWIN95      4       /* Completely ignore Win95 entries */
                     74: #define        MSDOSFSMNT_GEMDOSFS     8       /* This is a gemdos-flavour */
1.3       jdolecek   75: #define MSDOSFSMNT_VERSIONED   16      /* Struct is versioned */
1.1       jdolecek   76:
                     77: /* All flags above: */
                     78: #define        MSDOSFSMNT_MNTOPT \
                     79:        (MSDOSFSMNT_SHORTNAME|MSDOSFSMNT_LONGNAME|MSDOSFSMNT_NOWIN95 \
1.3       jdolecek   80:         |MSDOSFSMNT_GEMDOSFS|MSDOSFSMNT_VERSIONED)
                     81:
1.1       jdolecek   82: #define        MSDOSFSMNT_RONLY        0x80000000      /* mounted read-only    */
                     83: #define        MSDOSFSMNT_WAITONFAT    0x40000000      /* mounted synchronous  */
                     84: #define        MSDOSFS_FATMIRROR       0x20000000      /* FAT is mirrored */
                     85:
                     86: #define MSDOSFSMNT_BITS "\177\20" \
1.3       jdolecek   87:     "b\00shortname\0b\01longname\0b\02nowin95\0b\03gemdosfs\0b\04mntversioned\0" \
1.5     ! yamt       88:     "b\037ronly\0b\036waitonfat\0b\035fatmirror\0"
1.1       jdolecek   89:
                     90: #ifdef _KERNEL
1.2       thorpej    91: #include <sys/mallocvar.h>
                     92: MALLOC_DECLARE(M_MSDOSFSMNT);
                     93:
1.1       jdolecek   94: /*
                     95:  * Layout of the mount control block for a msdos file system.
                     96:  */
                     97: struct msdosfsmount {
                     98:        struct mount *pm_mountp;/* vfs mount struct for this fs */
                     99:        dev_t pm_dev;           /* block special device mounted */
                    100:        uid_t pm_uid;           /* uid to set as owner of the files */
                    101:        gid_t pm_gid;           /* gid to set as owner of the files */
1.3       jdolecek  102:        mode_t pm_mask;         /* mask to and with file protection bits
                    103:                                   for files */
                    104:        mode_t pm_dirmask;      /* mask to and with file protection bits
                    105:                                   for directories */
1.4       itojun    106:        int pm_gmtoff;          /* offset from UTC in seconds */
1.1       jdolecek  107:        struct vnode *pm_devvp; /* vnode for block device mntd */
                    108:        struct bpb50 pm_bpb;    /* BIOS parameter blk for this fs */
                    109:        u_long pm_FATsecs;      /* actual number of fat sectors */
                    110:        u_long pm_fatblk;       /* block # of first FAT */
                    111:        u_long pm_rootdirblk;   /* block # (cluster # for FAT32) of root directory number */
                    112:        u_long pm_rootdirsize;  /* size in blocks (not clusters) */
                    113:        u_long pm_firstcluster; /* block number of first cluster */
                    114:        u_long pm_nmbrofclusters;       /* # of clusters in filesystem */
                    115:        u_long pm_maxcluster;   /* maximum cluster number */
                    116:        u_long pm_freeclustercount;     /* number of free clusters */
                    117:        u_long pm_cnshift;      /* shift file offset right this amount to get a cluster number */
                    118:        u_long pm_crbomask;     /* and a file offset with this mask to get cluster rel offset */
                    119:        u_long pm_bnshift;      /* shift file offset right this amount to get a block number */
                    120:        u_long pm_bpcluster;    /* bytes per cluster */
                    121:        u_long pm_fmod;         /* ~0 if fs is modified, this can rollover to 0 */
                    122:        u_long pm_fatblocksize; /* size of fat blocks in bytes */
                    123:        u_long pm_fatblocksec;  /* size of fat blocks in sectors */
                    124:        u_long pm_fatsize;      /* size of fat in bytes */
                    125:        u_long pm_fatmask;      /* mask to use for fat numbers */
                    126:        u_long pm_fsinfo;       /* fsinfo block number */
                    127:        u_long pm_nxtfree;      /* next free cluster in fsinfo block */
                    128:        u_int pm_fatmult;       /* these 2 values are used in fat */
                    129:        u_int pm_fatdiv;        /*      offset computation */
                    130:        u_int pm_curfat;        /* current fat for FAT32 (0 otherwise) */
                    131:        u_int *pm_inusemap;     /* ptr to bitmap of in-use clusters */
                    132:        u_int pm_flags;         /* see below */
                    133:        struct netexport pm_export;     /* export information */
                    134: };
                    135: /* Byte offset in FAT on filesystem pmp, cluster cn */
                    136: #define        FATOFS(pmp, cn) ((cn) * (pmp)->pm_fatmult / (pmp)->pm_fatdiv)
                    137:
                    138: #define        VFSTOMSDOSFS(mp)        ((struct msdosfsmount *)mp->mnt_data)
                    139:
                    140: /* Number of bits in one pm_inusemap item: */
                    141: #define        N_INUSEBITS     (8 * sizeof(u_int))
                    142:
                    143: /*
                    144:  * Shorthand for fields in the bpb contained in the msdosfsmount structure.
                    145:  */
                    146: #define        pm_BytesPerSec  pm_bpb.bpbBytesPerSec
                    147: #define        pm_ResSectors   pm_bpb.bpbResSectors
                    148: #define        pm_FATs         pm_bpb.bpbFATs
                    149: #define        pm_RootDirEnts  pm_bpb.bpbRootDirEnts
                    150: #define        pm_Sectors      pm_bpb.bpbSectors
                    151: #define        pm_Media        pm_bpb.bpbMedia
                    152: #define        pm_SecPerTrack  pm_bpb.bpbSecPerTrack
                    153: #define        pm_Heads        pm_bpb.bpbHeads
                    154: #define        pm_HiddenSects  pm_bpb.bpbHiddenSecs
                    155: #define        pm_HugeSectors  pm_bpb.bpbHugeSectors
                    156:
                    157: /*
                    158:  * Convert pointer to buffer -> pointer to direntry
                    159:  */
                    160: #define        bptoep(pmp, bp, dirofs) \
                    161:        ((struct direntry *)(((bp)->b_data)     \
                    162:         + ((dirofs) & (pmp)->pm_crbomask)))
                    163:
                    164: /*
                    165:  * Convert block number to cluster number
                    166:  */
                    167: #define        de_bn2cn(pmp, bn) \
                    168:        ((bn) >> ((pmp)->pm_cnshift - (pmp)->pm_bnshift))
                    169:
                    170: /*
                    171:  * Convert cluster number to block number
                    172:  */
                    173: #define        de_cn2bn(pmp, cn) \
                    174:        ((cn) << ((pmp)->pm_cnshift - (pmp)->pm_bnshift))
                    175:
                    176: /*
                    177:  * Convert file offset to cluster number
                    178:  */
                    179: #define de_cluster(pmp, off) \
                    180:        ((off) >> (pmp)->pm_cnshift)
                    181:
                    182: /*
                    183:  * Clusters required to hold size bytes
                    184:  */
                    185: #define        de_clcount(pmp, size) \
                    186:        (((size) + (pmp)->pm_bpcluster - 1) >> (pmp)->pm_cnshift)
                    187:
                    188: /*
                    189:  * Convert file offset to block number
                    190:  */
                    191: #define de_blk(pmp, off) \
                    192:        (de_cn2bn(pmp, de_cluster((pmp), (off))))
                    193:
                    194: /*
                    195:  * Convert cluster number to file offset
                    196:  */
                    197: #define        de_cn2off(pmp, cn) \
                    198:        ((cn) << (pmp)->pm_cnshift)
                    199:
                    200: /*
                    201:  * Convert block number to file offset
                    202:  */
                    203: #define        de_bn2off(pmp, bn) \
                    204:        ((bn) << (pmp)->pm_bnshift)
                    205: /*
                    206:  * Map a cluster number into a filesystem relative block number.
                    207:  */
                    208: #define        cntobn(pmp, cn) \
                    209:        (de_cn2bn((pmp), (cn)-CLUST_FIRST) + (pmp)->pm_firstcluster)
                    210:
                    211: /*
                    212:  * Calculate block number for directory entry in root dir, offset dirofs
                    213:  */
                    214: #define        roottobn(pmp, dirofs) \
                    215:        (de_blk((pmp), (dirofs)) + (pmp)->pm_rootdirblk)
                    216:
                    217: /*
                    218:  * Calculate block number for directory entry at cluster dirclu, offset
                    219:  * dirofs
                    220:  */
                    221: #define        detobn(pmp, dirclu, dirofs) \
                    222:        ((dirclu) == MSDOSFSROOT \
                    223:         ? roottobn((pmp), (dirofs)) \
                    224:         : cntobn((pmp), (dirclu)))
                    225:
                    226: /*
                    227:  * Prototypes for MSDOSFS virtual filesystem operations
                    228:  */
                    229: void msdosfs_init __P((void));
                    230: void msdosfs_reinit __P((void));
                    231: void msdosfs_done __P((void));
                    232:
                    233: #endif /* _KERNEL */

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