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Annotation of researchv10no/netfs/serv/bsdffs.h, revision 1.1

1.1     ! root        1: /*
        !             2:  * minimal definitions of 4BSD `fast file system' format
        !             3:  * just enough to read a disk volume
        !             4:  */
        !             5: 
        !             6: #define        SBLOCK  8192    /* byte offset to (first) super-block */
        !             7: #define        SBSIZE  8192    /* size of super-block */
        !             8: 
        !             9: /*
        !            10:  * contents of super-block
        !            11:  */
        !            12: 
        !            13: struct fs
        !            14: {
        !            15:        struct  fs *fs_link;            /* linked list of file systems */
        !            16:        struct  fs *fs_rlink;           /*     used for incore super blocks */
        !            17:        long    fs_sblkno;              /* addr of super-block in filesys */
        !            18:        long    fs_cblkno;              /* offset of cyl-block in filesys */
        !            19:        long    fs_iblkno;              /* offset of inode-blocks in filesys */
        !            20:        long    fs_dblkno;              /* offset of first data after cg */
        !            21:        long    fs_cgoffset;            /* cylinder group offset in cylinder */
        !            22:        long    fs_cgmask;              /* used to calc mod fs_ntrak */
        !            23:        long    fs_time;                /* last time written */
        !            24:        long    fs_size;                /* number of blocks in fs */
        !            25:        long    fs_dsize;               /* number of data blocks in fs */
        !            26:        long    fs_ncg;                 /* number of cylinder groups */
        !            27:        long    fs_bsize;               /* size of basic blocks in fs */
        !            28:        long    fs_fsize;               /* size of frag blocks in fs */
        !            29:        long    fs_frag;                /* number of frags in a block in fs */
        !            30: /* these are configuration parameters */
        !            31:        long    fs_minfree;             /* minimum percentage of free blocks */
        !            32:        long    fs_rotdelay;            /* num of ms for optimal next block */
        !            33:        long    fs_rps;                 /* disk revolutions per second */
        !            34: /* these fields can be computed from the others */
        !            35:        long    fs_bmask;               /* ``blkoff'' calc of blk offsets */
        !            36:        long    fs_fmask;               /* ``fragoff'' calc of frag offsets */
        !            37:        long    fs_bshift;              /* ``lblkno'' calc of logical blkno */
        !            38:        long    fs_fshift;              /* ``numfrags'' calc number of frags */
        !            39: /* these are configuration parameters */
        !            40:        long    fs_maxcontig;           /* max number of contiguous blks */
        !            41:        long    fs_maxbpg;              /* max number of blks per cyl group */
        !            42: /* these fields can be computed from the others */
        !            43:        long    fs_fragshift;           /* block to frag shift */
        !            44:        long    fs_fsbtodb;             /* fsbtodb and dbtofsb shift constant */
        !            45:        long    fs_sbsize;              /* actual size of super block */
        !            46:        long    fs_csmask;              /* csum block offset */
        !            47:        long    fs_csshift;             /* csum block number */
        !            48:        long    fs_nindir;              /* value of NINDIR */
        !            49:        long    fs_inopb;               /* value of INOPB */
        !            50:        long    fs_nspf;                /* value of NSPF */
        !            51:        long    fs_optim;               /* optimization preference, see below */
        !            52:        long    fs_sparecon[5];         /* reserved for future constants */
        !            53: /* sizes determined by number of cylinder groups and their sizes */
        !            54:        long fs_csaddr;         /* blk addr of cyl grp summary area */
        !            55:        long    fs_cssize;              /* size of cyl grp summary area */
        !            56:        long    fs_cgsize;              /* cylinder group size */
        !            57: /* these fields should be derived from the hardware */
        !            58:        long    fs_ntrak;               /* tracks per cylinder */
        !            59:        long    fs_nsect;               /* sectors per track */
        !            60:        long    fs_spc;                 /* sectors per cylinder */
        !            61: /* this comes from the disk driver partitioning */
        !            62:        long    fs_ncyl;                /* cylinders in file system */
        !            63: /* these fields can be computed from the others */
        !            64:        long    fs_cpg;                 /* cylinders per group */
        !            65:        long    fs_ipg;                 /* inodes per group */
        !            66:        long    fs_fpg;                 /* blocks per group * fs_frag */
        !            67: #if NOTDEF     /* what follows isn't interesting */
        !            68: /* this data must be re-computed after crashes */
        !            69:        struct  csum fs_cstotal;        /* cylinder summary information */
        !            70: /* these fields are cleared at mount time */
        !            71:        char    fs_fmod;                /* super block modified flag */
        !            72:        char    fs_clean;               /* file system is clean flag */
        !            73:        char    fs_ronly;               /* mounted read-only flag */
        !            74:        char    fs_flags;               /* currently unused flag */
        !            75:        char    fs_fsmnt[MAXMNTLEN];    /* name mounted on */
        !            76: /* these fields retain the current block allocation info */
        !            77:        long    fs_cgrotor;             /* last cg searched */
        !            78:        struct  csum *fs_csp[MAXCSBUFS];/* list of fs_cs info buffers */
        !            79:        long    fs_cpc;                 /* cyl per cycle in postbl */
        !            80:        short   fs_postbl[MAXCPG][NRPOS];/* head of blocks for each rotation */
        !            81:        long    fs_magic;               /* magic number */
        !            82:        u_char  fs_rotbl[1];            /* list of blocks for each rotation */
        !            83: /* actually longer */
        !            84: #endif
        !            85: };
        !            86: 
        !            87: #define        INOSIZE 128     /* length of inode on disk */
        !            88: 
        !            89: #define        NDADDR  12
        !            90: #define        NIADDR  3
        !            91: 
        !            92: /*
        !            93:  * inode on disk
        !            94:  */
        !            95: 
        !            96: struct         icommon
        !            97: {
        !            98:        short   i_mode;         /*  0: mode and type of file */
        !            99:        short   i_nlink;        /*  2: number of links to file */
        !           100:        short   i_uid;          /*  4: owner's user id */
        !           101:        short   i_gid;          /*  6: owner's group id */
        !           102:        long    i_size;         /*  8: number of bytes in file */
        !           103:        long    i_hisize;       /* 12: high part of 64-byte size */
        !           104:        long    i_atime;        /* 16: time last accessed */
        !           105:        long    i_atspare;
        !           106:        long    i_mtime;        /* 24: time last modified */
        !           107:        long    i_mtspare;
        !           108:        long    i_ctime;        /* 32: last time inode changed */
        !           109:        long    i_ctspare;
        !           110:        long    i_db[NDADDR];   /* 40: disk block addresses */
        !           111:        long    i_ib[NIADDR];   /* 88: indirect blocks */
        !           112:        long    i_flags;        /* 100: status, currently unused */
        !           113:        long    i_blocks;       /* 104: blocks actually held */
        !           114:        long    i_spare[5];     /* 108: reserved, currently unused */
        !           115: };
        !           116: 
        !           117: #define        ROOTINO 2
        !           118: 
        !           119: /*
        !           120:  * directory format
        !           121:  */
        !           122: 
        !           123: #define        MAXNAMLEN       255
        !           124: 
        !           125: struct direct {
        !           126:        long    d_ino;                  /* inode number of entry */
        !           127:        unsigned short  d_reclen;               /* length of this record */
        !           128:        unsigned short  d_namlen;               /* length of string in d_name */
        !           129:        char    d_name[MAXNAMLEN + 1];  /* name must be no longer than this */
        !           130: };
        !           131: 
        !           132: #define DIRSIZ(dp) \
        !           133:     ((sizeof (struct direct) - (MAXNAMLEN+1)) + (((dp)->d_namlen+1 + 3) &~ 3))

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