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Annotation of src/sys/fs/msdosfs/msdosfsmount.h, Revision 1.15.30.2

1.15.30.2! yamt        1: /*     $NetBSD: msdosfsmount.h,v 1.15.30.1 2012/04/17 00:08:18 yamt 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:
1.11      christos   50: #ifndef _MSDOSFS_MSDOSFSMOUNT_H_
                     51: #define _MSDOSFS_MSDOSFSMOUNT_H_
                     52:
1.1       jdolecek   53: /*
                     54:  *  Arguments to mount MSDOS filesystems.
                     55:  */
                     56: struct msdosfs_args {
                     57:        char    *fspec;         /* blocks special holding the fs to mount */
1.10      jmmv       58:        struct  export_args30 _pad1; /* compat with old userland tools */
1.1       jdolecek   59:        uid_t   uid;            /* uid that owns msdosfs files */
                     60:        gid_t   gid;            /* gid that owns msdosfs files */
                     61:        mode_t  mask;           /* mask to be applied for msdosfs perms */
                     62:        int     flags;          /* see below */
1.3       jdolecek   63:
                     64:        /* Following items added after versioning support */
                     65:        int     version;        /* version of the struct */
1.6       jdolecek   66: #define MSDOSFSMNT_VERSION     3
1.3       jdolecek   67:        mode_t  dirmask;        /* v2: mask to be applied for msdosfs perms */
1.6       jdolecek   68:        int     gmtoff;         /* v3: offset from UTC in seconds */
1.1       jdolecek   69: };
                     70:
                     71: /*
                     72:  * Msdosfs mount options:
                     73:  */
                     74: #define        MSDOSFSMNT_SHORTNAME    1       /* Force old DOS short names only */
                     75: #define        MSDOSFSMNT_LONGNAME     2       /* Force Win'95 long names */
                     76: #define        MSDOSFSMNT_NOWIN95      4       /* Completely ignore Win95 entries */
1.15.30.2! yamt       77: #define        MSDOSFSMNT_GEMDOSFS     8       /* This is a GEMDOS-flavour */
1.3       jdolecek   78: #define MSDOSFSMNT_VERSIONED   16      /* Struct is versioned */
1.1       jdolecek   79:
                     80: /* All flags above: */
                     81: #define        MSDOSFSMNT_MNTOPT \
                     82:        (MSDOSFSMNT_SHORTNAME|MSDOSFSMNT_LONGNAME|MSDOSFSMNT_NOWIN95 \
1.3       jdolecek   83:         |MSDOSFSMNT_GEMDOSFS|MSDOSFSMNT_VERSIONED)
                     84:
1.1       jdolecek   85: #define        MSDOSFSMNT_RONLY        0x80000000      /* mounted read-only    */
                     86: #define        MSDOSFSMNT_WAITONFAT    0x40000000      /* mounted synchronous  */
                     87: #define        MSDOSFS_FATMIRROR       0x20000000      /* FAT is mirrored */
                     88:
                     89: #define MSDOSFSMNT_BITS "\177\20" \
1.3       jdolecek   90:     "b\00shortname\0b\01longname\0b\02nowin95\0b\03gemdosfs\0b\04mntversioned\0" \
1.5       yamt       91:     "b\037ronly\0b\036waitonfat\0b\035fatmirror\0"
1.1       jdolecek   92:
                     93: #ifdef _KERNEL
1.2       thorpej    94: #include <sys/mallocvar.h>
1.15.30.1  yamt       95: #ifdef MALLOC_DECLARE
1.2       thorpej    96: MALLOC_DECLARE(M_MSDOSFSMNT);
1.14      rumble     97: MALLOC_DECLARE(M_MSDOSFSTMP);
1.15.30.1  yamt       98: #endif
1.2       thorpej    99:
1.1       jdolecek  100: /*
1.15.30.2! yamt      101:  * Layout of the mount control block for a MSDOSFS file system.
1.1       jdolecek  102:  */
                    103: struct msdosfsmount {
                    104:        struct mount *pm_mountp;/* vfs mount struct for this fs */
                    105:        dev_t pm_dev;           /* block special device mounted */
                    106:        uid_t pm_uid;           /* uid to set as owner of the files */
                    107:        gid_t pm_gid;           /* gid to set as owner of the files */
1.3       jdolecek  108:        mode_t pm_mask;         /* mask to and with file protection bits
                    109:                                   for files */
                    110:        mode_t pm_dirmask;      /* mask to and with file protection bits
                    111:                                   for directories */
1.4       itojun    112:        int pm_gmtoff;          /* offset from UTC in seconds */
1.1       jdolecek  113:        struct vnode *pm_devvp; /* vnode for block device mntd */
                    114:        struct bpb50 pm_bpb;    /* BIOS parameter blk for this fs */
1.15.30.2! yamt      115:        u_long pm_FATsecs;      /* actual number of FAT sectors */
1.12      scw       116:        u_long pm_fatblk;       /* sector # of first FAT */
                    117:        u_long pm_rootdirblk;   /* sector # (cluster # for FAT32) of root directory number */
                    118:        u_long pm_rootdirsize;  /* size in sectors (not clusters) */
                    119:        u_long pm_firstcluster; /* sector number of first cluster */
1.1       jdolecek  120:        u_long pm_nmbrofclusters;       /* # of clusters in filesystem */
                    121:        u_long pm_maxcluster;   /* maximum cluster number */
                    122:        u_long pm_freeclustercount;     /* number of free clusters */
                    123:        u_long pm_cnshift;      /* shift file offset right this amount to get a cluster number */
                    124:        u_long pm_crbomask;     /* and a file offset with this mask to get cluster rel offset */
1.12      scw       125:        u_long pm_bnshift;      /* shift file offset right this amount to get a sector number */
1.1       jdolecek  126:        u_long pm_bpcluster;    /* bytes per cluster */
                    127:        u_long pm_fmod;         /* ~0 if fs is modified, this can rollover to 0 */
1.15.30.2! yamt      128:        u_long pm_fatblocksize; /* size of FAT blocks in bytes */
        !           129:        u_long pm_fatblocksec;  /* size of FAT blocks in sectors */
        !           130:        u_long pm_fatsize;      /* size of FAT in bytes */
        !           131:        u_long pm_fatmask;      /* mask to use for FAT numbers */
1.1       jdolecek  132:        u_long pm_fsinfo;       /* fsinfo block number */
                    133:        u_long pm_nxtfree;      /* next free cluster in fsinfo block */
1.15.30.2! yamt      134:        u_int pm_fatmult;       /* these 2 values are used in FAT */
1.1       jdolecek  135:        u_int pm_fatdiv;        /*      offset computation */
1.15.30.2! yamt      136:        u_int pm_curfat;        /* current FAT for FAT32 (0 otherwise) */
1.1       jdolecek  137:        u_int *pm_inusemap;     /* ptr to bitmap of in-use clusters */
                    138:        u_int pm_flags;         /* see below */
                    139: };
                    140: /* Byte offset in FAT on filesystem pmp, cluster cn */
                    141: #define        FATOFS(pmp, cn) ((cn) * (pmp)->pm_fatmult / (pmp)->pm_fatdiv)
                    142:
                    143: #define        VFSTOMSDOSFS(mp)        ((struct msdosfsmount *)mp->mnt_data)
                    144:
                    145: /* Number of bits in one pm_inusemap item: */
                    146: #define        N_INUSEBITS     (8 * sizeof(u_int))
                    147:
                    148: /*
                    149:  * Shorthand for fields in the bpb contained in the msdosfsmount structure.
                    150:  */
                    151: #define        pm_BytesPerSec  pm_bpb.bpbBytesPerSec
                    152: #define        pm_ResSectors   pm_bpb.bpbResSectors
                    153: #define        pm_FATs         pm_bpb.bpbFATs
                    154: #define        pm_RootDirEnts  pm_bpb.bpbRootDirEnts
                    155: #define        pm_Sectors      pm_bpb.bpbSectors
                    156: #define        pm_Media        pm_bpb.bpbMedia
                    157: #define        pm_SecPerTrack  pm_bpb.bpbSecPerTrack
                    158: #define        pm_Heads        pm_bpb.bpbHeads
                    159: #define        pm_HiddenSects  pm_bpb.bpbHiddenSecs
                    160: #define        pm_HugeSectors  pm_bpb.bpbHugeSectors
                    161:
                    162: /*
                    163:  * Convert pointer to buffer -> pointer to direntry
                    164:  */
                    165: #define        bptoep(pmp, bp, dirofs) \
1.13      christos  166:        ((struct direntry *)(((char *)(bp)->b_data)     \
1.1       jdolecek  167:         + ((dirofs) & (pmp)->pm_crbomask)))
                    168:
                    169: /*
1.12      scw       170:  * Convert sector number to cluster number
1.1       jdolecek  171:  */
                    172: #define        de_bn2cn(pmp, bn) \
                    173:        ((bn) >> ((pmp)->pm_cnshift - (pmp)->pm_bnshift))
                    174:
                    175: /*
1.12      scw       176:  * Convert cluster number to sector number
1.1       jdolecek  177:  */
                    178: #define        de_cn2bn(pmp, cn) \
                    179:        ((cn) << ((pmp)->pm_cnshift - (pmp)->pm_bnshift))
                    180:
                    181: /*
1.12      scw       182:  * Convert sector number to kernel block number
                    183:  */
                    184: #define de_bn2kb(pmp, bn) \
                    185:        ((bn) << ((pmp)->pm_bnshift - DEV_BSHIFT))
                    186:
                    187: /*
                    188:  * Convert kernel block number to sector number
                    189:  */
                    190: #define de_kb2bn(pmp, kb) \
                    191:        ((kb) >> ((pmp)->pm_bnshift - DEV_BSHIFT))
                    192:
                    193: /*
1.1       jdolecek  194:  * Convert file offset to cluster number
                    195:  */
                    196: #define de_cluster(pmp, off) \
                    197:        ((off) >> (pmp)->pm_cnshift)
                    198:
                    199: /*
                    200:  * Clusters required to hold size bytes
                    201:  */
                    202: #define        de_clcount(pmp, size) \
                    203:        (((size) + (pmp)->pm_bpcluster - 1) >> (pmp)->pm_cnshift)
                    204:
                    205: /*
1.12      scw       206:  * Convert file offset to sector number
1.1       jdolecek  207:  */
                    208: #define de_blk(pmp, off) \
                    209:        (de_cn2bn(pmp, de_cluster((pmp), (off))))
                    210:
                    211: /*
                    212:  * Convert cluster number to file offset
                    213:  */
                    214: #define        de_cn2off(pmp, cn) \
                    215:        ((cn) << (pmp)->pm_cnshift)
                    216:
                    217: /*
1.12      scw       218:  * Convert sector number to file offset
1.1       jdolecek  219:  */
                    220: #define        de_bn2off(pmp, bn) \
                    221:        ((bn) << (pmp)->pm_bnshift)
                    222: /*
1.12      scw       223:  * Map a cluster number into a filesystem relative sector number.
1.1       jdolecek  224:  */
                    225: #define        cntobn(pmp, cn) \
                    226:        (de_cn2bn((pmp), (cn)-CLUST_FIRST) + (pmp)->pm_firstcluster)
                    227:
                    228: /*
1.12      scw       229:  * Calculate sector number for directory entry in root dir, offset dirofs
1.1       jdolecek  230:  */
                    231: #define        roottobn(pmp, dirofs) \
                    232:        (de_blk((pmp), (dirofs)) + (pmp)->pm_rootdirblk)
                    233:
                    234: /*
1.12      scw       235:  * Calculate sector number for directory entry at cluster dirclu, offset
1.1       jdolecek  236:  * dirofs
                    237:  */
                    238: #define        detobn(pmp, dirclu, dirofs) \
                    239:        ((dirclu) == MSDOSFSROOT \
                    240:         ? roottobn((pmp), (dirofs)) \
                    241:         : cntobn((pmp), (dirclu)))
                    242:
                    243: /*
                    244:  * Prototypes for MSDOSFS virtual filesystem operations
                    245:  */
1.8       xtraeme   246: void msdosfs_init(void);
                    247: void msdosfs_reinit(void);
                    248: void msdosfs_done(void);
1.1       jdolecek  249:
                    250: #endif /* _KERNEL */
1.11      christos  251: #endif /* _MSDOSFS_MSDOSFSMOUNT_H_ */

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