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Annotation of 43BSDTahoe/sys/h/fs.h, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1982, 1986 Regents of the University of California.
        !             3:  * All rights reserved.
        !             4:  *
        !             5:  * Redistribution and use in source and binary forms are permitted
        !             6:  * provided that the above copyright notice and this paragraph are
        !             7:  * duplicated in all such forms and that any documentation,
        !             8:  * advertising materials, and other materials related to such
        !             9:  * distribution and use acknowledge that the software was developed
        !            10:  * by the University of California, Berkeley.  The name of the
        !            11:  * University may not be used to endorse or promote products derived
        !            12:  * from this software without specific prior written permission.
        !            13:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
        !            14:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
        !            15:  * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            16:  *
        !            17:  *     @(#)fs.h        7.6 (Berkeley) 6/27/88
        !            18:  */
        !            19: 
        !            20: /*
        !            21:  * Each disk drive contains some number of file systems.
        !            22:  * A file system consists of a number of cylinder groups.
        !            23:  * Each cylinder group has inodes and data.
        !            24:  *
        !            25:  * A file system is described by its super-block, which in turn
        !            26:  * describes the cylinder groups.  The super-block is critical
        !            27:  * data and is replicated in each cylinder group to protect against
        !            28:  * catastrophic loss.  This is done at `newfs' time and the critical
        !            29:  * super-block data does not change, so the copies need not be
        !            30:  * referenced further unless disaster strikes.
        !            31:  *
        !            32:  * For file system fs, the offsets of the various blocks of interest
        !            33:  * are given in the super block as:
        !            34:  *     [fs->fs_sblkno]         Super-block
        !            35:  *     [fs->fs_cblkno]         Cylinder group block
        !            36:  *     [fs->fs_iblkno]         Inode blocks
        !            37:  *     [fs->fs_dblkno]         Data blocks
        !            38:  * The beginning of cylinder group cg in fs, is given by
        !            39:  * the ``cgbase(fs, cg)'' macro.
        !            40:  *
        !            41:  * The first boot and super blocks are given in absolute disk addresses.
        !            42:  * The byte-offset forms are preferred, as they don't imply a sector size.
        !            43:  */
        !            44: #define BBSIZE         8192
        !            45: #define SBSIZE         8192
        !            46: #define        BBOFF           ((off_t)(0))
        !            47: #define        SBOFF           ((off_t)(BBOFF + BBSIZE))
        !            48: #define        BBLOCK          ((daddr_t)(0))
        !            49: #define        SBLOCK          ((daddr_t)(BBLOCK + BBSIZE / DEV_BSIZE))
        !            50: 
        !            51: /*
        !            52:  * Addresses stored in inodes are capable of addressing fragments
        !            53:  * of `blocks'. File system blocks of at most size MAXBSIZE can 
        !            54:  * be optionally broken into 2, 4, or 8 pieces, each of which is
        !            55:  * addressible; these pieces may be DEV_BSIZE, or some multiple of
        !            56:  * a DEV_BSIZE unit.
        !            57:  *
        !            58:  * Large files consist of exclusively large data blocks.  To avoid
        !            59:  * undue wasted disk space, the last data block of a small file may be
        !            60:  * allocated as only as many fragments of a large block as are
        !            61:  * necessary.  The file system format retains only a single pointer
        !            62:  * to such a fragment, which is a piece of a single large block that
        !            63:  * has been divided.  The size of such a fragment is determinable from
        !            64:  * information in the inode, using the ``blksize(fs, ip, lbn)'' macro.
        !            65:  *
        !            66:  * The file system records space availability at the fragment level;
        !            67:  * to determine block availability, aligned fragments are examined.
        !            68:  *
        !            69:  * The root inode is the root of the file system.
        !            70:  * Inode 0 can't be used for normal purposes and
        !            71:  * historically bad blocks were linked to inode 1,
        !            72:  * thus the root inode is 2. (inode 1 is no longer used for
        !            73:  * this purpose, however numerous dump tapes make this
        !            74:  * assumption, so we are stuck with it)
        !            75:  */
        !            76: #define        ROOTINO         ((ino_t)2)      /* i number of all roots */
        !            77: 
        !            78: /*
        !            79:  * MINBSIZE is the smallest allowable block size.
        !            80:  * In order to insure that it is possible to create files of size
        !            81:  * 2^32 with only two levels of indirection, MINBSIZE is set to 4096.
        !            82:  * MINBSIZE must be big enough to hold a cylinder group block,
        !            83:  * thus changes to (struct cg) must keep its size within MINBSIZE.
        !            84:  * Note that super blocks are always of size SBSIZE,
        !            85:  * and that both SBSIZE and MAXBSIZE must be >= MINBSIZE.
        !            86:  */
        !            87: #define MINBSIZE       4096
        !            88: 
        !            89: /*
        !            90:  * The path name on which the file system is mounted is maintained
        !            91:  * in fs_fsmnt. MAXMNTLEN defines the amount of space allocated in 
        !            92:  * the super block for this name.
        !            93:  * The limit on the amount of summary information per file system
        !            94:  * is defined by MAXCSBUFS. It is currently parameterized for a
        !            95:  * maximum of two million cylinders.
        !            96:  */
        !            97: #define MAXMNTLEN 512
        !            98: #define MAXCSBUFS 32
        !            99: 
        !           100: /*
        !           101:  * Per cylinder group information; summarized in blocks allocated
        !           102:  * from first cylinder group data blocks.  These blocks have to be
        !           103:  * read in from fs_csaddr (size fs_cssize) in addition to the
        !           104:  * super block.
        !           105:  *
        !           106:  * N.B. sizeof(struct csum) must be a power of two in order for
        !           107:  * the ``fs_cs'' macro to work (see below).
        !           108:  */
        !           109: struct csum {
        !           110:        long    cs_ndir;        /* number of directories */
        !           111:        long    cs_nbfree;      /* number of free blocks */
        !           112:        long    cs_nifree;      /* number of free inodes */
        !           113:        long    cs_nffree;      /* number of free frags */
        !           114: };
        !           115: 
        !           116: /*
        !           117:  * Super block for a file system.
        !           118:  */
        !           119: #define        FS_MAGIC        0x011954
        !           120: struct fs
        !           121: {
        !           122:        struct  fs *fs_link;            /* linked list of file systems */
        !           123:        struct  fs *fs_rlink;           /*     used for incore super blocks */
        !           124:        daddr_t fs_sblkno;              /* addr of super-block in filesys */
        !           125:        daddr_t fs_cblkno;              /* offset of cyl-block in filesys */
        !           126:        daddr_t fs_iblkno;              /* offset of inode-blocks in filesys */
        !           127:        daddr_t fs_dblkno;              /* offset of first data after cg */
        !           128:        long    fs_cgoffset;            /* cylinder group offset in cylinder */
        !           129:        long    fs_cgmask;              /* used to calc mod fs_ntrak */
        !           130:        time_t  fs_time;                /* last time written */
        !           131:        long    fs_size;                /* number of blocks in fs */
        !           132:        long    fs_dsize;               /* number of data blocks in fs */
        !           133:        long    fs_ncg;                 /* number of cylinder groups */
        !           134:        long    fs_bsize;               /* size of basic blocks in fs */
        !           135:        long    fs_fsize;               /* size of frag blocks in fs */
        !           136:        long    fs_frag;                /* number of frags in a block in fs */
        !           137: /* these are configuration parameters */
        !           138:        long    fs_minfree;             /* minimum percentage of free blocks */
        !           139:        long    fs_rotdelay;            /* num of ms for optimal next block */
        !           140:        long    fs_rps;                 /* disk revolutions per second */
        !           141: /* these fields can be computed from the others */
        !           142:        long    fs_bmask;               /* ``blkoff'' calc of blk offsets */
        !           143:        long    fs_fmask;               /* ``fragoff'' calc of frag offsets */
        !           144:        long    fs_bshift;              /* ``lblkno'' calc of logical blkno */
        !           145:        long    fs_fshift;              /* ``numfrags'' calc number of frags */
        !           146: /* these are configuration parameters */
        !           147:        long    fs_maxcontig;           /* max number of contiguous blks */
        !           148:        long    fs_maxbpg;              /* max number of blks per cyl group */
        !           149: /* these fields can be computed from the others */
        !           150:        long    fs_fragshift;           /* block to frag shift */
        !           151:        long    fs_fsbtodb;             /* fsbtodb and dbtofsb shift constant */
        !           152:        long    fs_sbsize;              /* actual size of super block */
        !           153:        long    fs_csmask;              /* csum block offset */
        !           154:        long    fs_csshift;             /* csum block number */
        !           155:        long    fs_nindir;              /* value of NINDIR */
        !           156:        long    fs_inopb;               /* value of INOPB */
        !           157:        long    fs_nspf;                /* value of NSPF */
        !           158: /* yet another configuration parameter */
        !           159:        long    fs_optim;               /* optimization preference, see below */
        !           160: /* these fields are derived from the hardware */
        !           161:        long    fs_npsect;              /* # sectors/track including spares */
        !           162:        long    fs_interleave;          /* hardware sector interleave */
        !           163:        long    fs_trackskew;           /* sector 0 skew, per track */
        !           164:        long    fs_headswitch;          /* head switch time, usec */
        !           165:        long    fs_trkseek;             /* track-to-track seek, usec */
        !           166: /* sizes determined by number of cylinder groups and their sizes */
        !           167:        daddr_t fs_csaddr;              /* blk addr of cyl grp summary area */
        !           168:        long    fs_cssize;              /* size of cyl grp summary area */
        !           169:        long    fs_cgsize;              /* cylinder group size */
        !           170: /* these fields are derived from the hardware */
        !           171:        long    fs_ntrak;               /* tracks per cylinder */
        !           172:        long    fs_nsect;               /* sectors per track */
        !           173:        long    fs_spc;                 /* sectors per cylinder */
        !           174: /* this comes from the disk driver partitioning */
        !           175:        long    fs_ncyl;                /* cylinders in file system */
        !           176: /* these fields can be computed from the others */
        !           177:        long    fs_cpg;                 /* cylinders per group */
        !           178:        long    fs_ipg;                 /* inodes per group */
        !           179:        long    fs_fpg;                 /* blocks per group * fs_frag */
        !           180: /* this data must be re-computed after crashes */
        !           181:        struct  csum fs_cstotal;        /* cylinder summary information */
        !           182: /* these fields are cleared at mount time */
        !           183:        char    fs_fmod;                /* super block modified flag */
        !           184:        char    fs_clean;               /* file system is clean flag */
        !           185:        char    fs_ronly;               /* mounted read-only flag */
        !           186:        char    fs_flags;               /* currently unused flag */
        !           187:        char    fs_fsmnt[MAXMNTLEN];    /* name mounted on */
        !           188: /* these fields retain the current block allocation info */
        !           189:        long    fs_cgrotor;             /* last cg searched */
        !           190:        struct  csum *fs_csp[MAXCSBUFS];/* list of fs_cs info buffers */
        !           191:        long    fs_cpc;                 /* cyl per cycle in postbl */
        !           192:        short   fs_opostbl[16][8];      /* old rotation block list head */
        !           193:        long    fs_sparecon[56];        /* reserved for future constants */
        !           194:        quad    fs_qbmask;              /* ~fs_bmask - for use with quad size */
        !           195:        quad    fs_qfmask;              /* ~fs_fmask - for use with quad size */
        !           196:        long    fs_postblformat;        /* format of positional layout tables */
        !           197:        long    fs_nrpos;               /* number of rotaional positions */
        !           198:        long    fs_postbloff;           /* (short) rotation block list head */
        !           199:        long    fs_rotbloff;            /* (u_char) blocks for each rotation */
        !           200:        long    fs_magic;               /* magic number */
        !           201:        u_char  fs_space[1];            /* list of blocks for each rotation */
        !           202: /* actually longer */
        !           203: };
        !           204: /*
        !           205:  * Preference for optimization.
        !           206:  */
        !           207: #define FS_OPTTIME     0       /* minimize allocation time */
        !           208: #define FS_OPTSPACE    1       /* minimize disk fragmentation */
        !           209: 
        !           210: /*
        !           211:  * Rotational layout table format types
        !           212:  */
        !           213: #define FS_42POSTBLFMT         -1      /* 4.2BSD rotational table format */
        !           214: #define FS_DYNAMICPOSTBLFMT    1       /* dynamic rotational table format */
        !           215: /*
        !           216:  * Macros for access to superblock array structures
        !           217:  */
        !           218: #define fs_postbl(fs, cylno) \
        !           219:     (((fs)->fs_postblformat == FS_42POSTBLFMT) \
        !           220:     ? ((fs)->fs_opostbl[cylno]) \
        !           221:     : ((short *)((char *)(fs) + (fs)->fs_postbloff) + (cylno) * (fs)->fs_nrpos))
        !           222: #define fs_rotbl(fs) \
        !           223:     (((fs)->fs_postblformat == FS_42POSTBLFMT) \
        !           224:     ? ((fs)->fs_space) \
        !           225:     : ((u_char *)((char *)(fs) + (fs)->fs_rotbloff)))
        !           226: 
        !           227: /*
        !           228:  * Convert cylinder group to base address of its global summary info.
        !           229:  *
        !           230:  * N.B. This macro assumes that sizeof(struct csum) is a power of two.
        !           231:  */
        !           232: #define fs_cs(fs, indx) \
        !           233:        fs_csp[(indx) >> (fs)->fs_csshift][(indx) & ~(fs)->fs_csmask]
        !           234: 
        !           235: /*
        !           236:  * Cylinder group block for a file system.
        !           237:  */
        !           238: #define        CG_MAGIC        0x090255
        !           239: struct cg {
        !           240:        struct  cg *cg_link;            /* linked list of cyl groups */
        !           241:        long    cg_magic;               /* magic number */
        !           242:        time_t  cg_time;                /* time last written */
        !           243:        long    cg_cgx;                 /* we are the cgx'th cylinder group */
        !           244:        short   cg_ncyl;                /* number of cyl's this cg */
        !           245:        short   cg_niblk;               /* number of inode blocks this cg */
        !           246:        long    cg_ndblk;               /* number of data blocks this cg */
        !           247:        struct  csum cg_cs;             /* cylinder summary information */
        !           248:        long    cg_rotor;               /* position of last used block */
        !           249:        long    cg_frotor;              /* position of last used frag */
        !           250:        long    cg_irotor;              /* position of last used inode */
        !           251:        long    cg_frsum[MAXFRAG];      /* counts of available frags */
        !           252:        long    cg_btotoff;             /* (long) block totals per cylinder */
        !           253:        long    cg_boff;                /* (short) free block positions */
        !           254:        long    cg_iusedoff;            /* (char) used inode map */
        !           255:        long    cg_freeoff;             /* (u_char) free block map */
        !           256:        long    cg_nextfreeoff;         /* (u_char) next available space */
        !           257:        long    cg_sparecon[16];        /* reserved for future use */
        !           258:        u_char  cg_space[1];            /* space for cylinder group maps */
        !           259: /* actually longer */
        !           260: };
        !           261: /*
        !           262:  * Macros for access to cylinder group array structures
        !           263:  */
        !           264: #define cg_blktot(cgp) \
        !           265:     (((cgp)->cg_magic != CG_MAGIC) \
        !           266:     ? (((struct ocg *)(cgp))->cg_btot) \
        !           267:     : ((long *)((char *)(cgp) + (cgp)->cg_btotoff)))
        !           268: #define cg_blks(fs, cgp, cylno) \
        !           269:     (((cgp)->cg_magic != CG_MAGIC) \
        !           270:     ? (((struct ocg *)(cgp))->cg_b[cylno]) \
        !           271:     : ((short *)((char *)(cgp) + (cgp)->cg_boff) + (cylno) * (fs)->fs_nrpos))
        !           272: #define cg_inosused(cgp) \
        !           273:     (((cgp)->cg_magic != CG_MAGIC) \
        !           274:     ? (((struct ocg *)(cgp))->cg_iused) \
        !           275:     : ((char *)((char *)(cgp) + (cgp)->cg_iusedoff)))
        !           276: #define cg_blksfree(cgp) \
        !           277:     (((cgp)->cg_magic != CG_MAGIC) \
        !           278:     ? (((struct ocg *)(cgp))->cg_free) \
        !           279:     : ((u_char *)((char *)(cgp) + (cgp)->cg_freeoff)))
        !           280: #define cg_chkmagic(cgp) \
        !           281:     ((cgp)->cg_magic == CG_MAGIC || ((struct ocg *)(cgp))->cg_magic == CG_MAGIC)
        !           282: 
        !           283: /*
        !           284:  * The following structure is defined
        !           285:  * for compatibility with old file systems.
        !           286:  */
        !           287: struct ocg {
        !           288:        struct  ocg *cg_link;           /* linked list of cyl groups */
        !           289:        struct  ocg *cg_rlink;          /*     used for incore cyl groups */
        !           290:        time_t  cg_time;                /* time last written */
        !           291:        long    cg_cgx;                 /* we are the cgx'th cylinder group */
        !           292:        short   cg_ncyl;                /* number of cyl's this cg */
        !           293:        short   cg_niblk;               /* number of inode blocks this cg */
        !           294:        long    cg_ndblk;               /* number of data blocks this cg */
        !           295:        struct  csum cg_cs;             /* cylinder summary information */
        !           296:        long    cg_rotor;               /* position of last used block */
        !           297:        long    cg_frotor;              /* position of last used frag */
        !           298:        long    cg_irotor;              /* position of last used inode */
        !           299:        long    cg_frsum[8];            /* counts of available frags */
        !           300:        long    cg_btot[32];            /* block totals per cylinder */
        !           301:        short   cg_b[32][8];            /* positions of free blocks */
        !           302:        char    cg_iused[256];          /* used inode map */
        !           303:        long    cg_magic;               /* magic number */
        !           304:        u_char  cg_free[1];             /* free block map */
        !           305: /* actually longer */
        !           306: };
        !           307: 
        !           308: /*
        !           309:  * Turn file system block numbers into disk block addresses.
        !           310:  * This maps file system blocks to device size blocks.
        !           311:  */
        !           312: #define fsbtodb(fs, b) ((b) << (fs)->fs_fsbtodb)
        !           313: #define        dbtofsb(fs, b)  ((b) >> (fs)->fs_fsbtodb)
        !           314: 
        !           315: /*
        !           316:  * Cylinder group macros to locate things in cylinder groups.
        !           317:  * They calc file system addresses of cylinder group data structures.
        !           318:  */
        !           319: #define        cgbase(fs, c)   ((daddr_t)((fs)->fs_fpg * (c)))
        !           320: #define cgstart(fs, c) \
        !           321:        (cgbase(fs, c) + (fs)->fs_cgoffset * ((c) & ~((fs)->fs_cgmask)))
        !           322: #define        cgsblock(fs, c) (cgstart(fs, c) + (fs)->fs_sblkno)      /* super blk */
        !           323: #define        cgtod(fs, c)    (cgstart(fs, c) + (fs)->fs_cblkno)      /* cg block */
        !           324: #define        cgimin(fs, c)   (cgstart(fs, c) + (fs)->fs_iblkno)      /* inode blk */
        !           325: #define        cgdmin(fs, c)   (cgstart(fs, c) + (fs)->fs_dblkno)      /* 1st data */
        !           326: 
        !           327: /*
        !           328:  * Macros for handling inode numbers:
        !           329:  *     inode number to file system block offset.
        !           330:  *     inode number to cylinder group number.
        !           331:  *     inode number to file system block address.
        !           332:  */
        !           333: #define        itoo(fs, x)     ((x) % INOPB(fs))
        !           334: #define        itog(fs, x)     ((x) / (fs)->fs_ipg)
        !           335: #define        itod(fs, x) \
        !           336:        ((daddr_t)(cgimin(fs, itog(fs, x)) + \
        !           337:        (blkstofrags((fs), (((x) % (fs)->fs_ipg) / INOPB(fs))))))
        !           338: 
        !           339: /*
        !           340:  * Give cylinder group number for a file system block.
        !           341:  * Give cylinder group block number for a file system block.
        !           342:  */
        !           343: #define        dtog(fs, d)     ((d) / (fs)->fs_fpg)
        !           344: #define        dtogd(fs, d)    ((d) % (fs)->fs_fpg)
        !           345: 
        !           346: /*
        !           347:  * Extract the bits for a block from a map.
        !           348:  * Compute the cylinder and rotational position of a cyl block addr.
        !           349:  */
        !           350: #define blkmap(fs, map, loc) \
        !           351:     (((map)[(loc) / NBBY] >> ((loc) % NBBY)) & (0xff >> (NBBY - (fs)->fs_frag)))
        !           352: #define cbtocylno(fs, bno) \
        !           353:     ((bno) * NSPF(fs) / (fs)->fs_spc)
        !           354: #define cbtorpos(fs, bno) \
        !           355:     (((bno) * NSPF(fs) % (fs)->fs_spc / (fs)->fs_nsect * (fs)->fs_trackskew + \
        !           356:      (bno) * NSPF(fs) % (fs)->fs_spc % (fs)->fs_nsect * (fs)->fs_interleave) % \
        !           357:      (fs)->fs_nsect * (fs)->fs_nrpos / (fs)->fs_npsect)
        !           358: 
        !           359: /*
        !           360:  * The following macros optimize certain frequently calculated
        !           361:  * quantities by using shifts and masks in place of divisions
        !           362:  * modulos and multiplications.
        !           363:  */
        !           364: #define blkoff(fs, loc)                /* calculates (loc % fs->fs_bsize) */ \
        !           365:        ((loc) & ~(fs)->fs_bmask)
        !           366: #define fragoff(fs, loc)       /* calculates (loc % fs->fs_fsize) */ \
        !           367:        ((loc) & ~(fs)->fs_fmask)
        !           368: #define lblkno(fs, loc)                /* calculates (loc / fs->fs_bsize) */ \
        !           369:        ((loc) >> (fs)->fs_bshift)
        !           370: #define numfrags(fs, loc)      /* calculates (loc / fs->fs_fsize) */ \
        !           371:        ((loc) >> (fs)->fs_fshift)
        !           372: #define blkroundup(fs, size)   /* calculates roundup(size, fs->fs_bsize) */ \
        !           373:        (((size) + (fs)->fs_bsize - 1) & (fs)->fs_bmask)
        !           374: #define fragroundup(fs, size)  /* calculates roundup(size, fs->fs_fsize) */ \
        !           375:        (((size) + (fs)->fs_fsize - 1) & (fs)->fs_fmask)
        !           376: #define fragstoblks(fs, frags) /* calculates (frags / fs->fs_frag) */ \
        !           377:        ((frags) >> (fs)->fs_fragshift)
        !           378: #define blkstofrags(fs, blks)  /* calculates (blks * fs->fs_frag) */ \
        !           379:        ((blks) << (fs)->fs_fragshift)
        !           380: #define fragnum(fs, fsb)       /* calculates (fsb % fs->fs_frag) */ \
        !           381:        ((fsb) & ((fs)->fs_frag - 1))
        !           382: #define blknum(fs, fsb)                /* calculates rounddown(fsb, fs->fs_frag) */ \
        !           383:        ((fsb) &~ ((fs)->fs_frag - 1))
        !           384: 
        !           385: /*
        !           386:  * Determine the number of available frags given a
        !           387:  * percentage to hold in reserve
        !           388:  */
        !           389: #define freespace(fs, percentreserved) \
        !           390:        (blkstofrags((fs), (fs)->fs_cstotal.cs_nbfree) + \
        !           391:        (fs)->fs_cstotal.cs_nffree - ((fs)->fs_dsize * (percentreserved) / 100))
        !           392: 
        !           393: /*
        !           394:  * Determining the size of a file block in the file system.
        !           395:  */
        !           396: #define blksize(fs, ip, lbn) \
        !           397:        (((lbn) >= NDADDR || (ip)->i_size >= ((lbn) + 1) << (fs)->fs_bshift) \
        !           398:            ? (fs)->fs_bsize \
        !           399:            : (fragroundup(fs, blkoff(fs, (ip)->i_size))))
        !           400: #define dblksize(fs, dip, lbn) \
        !           401:        (((lbn) >= NDADDR || (dip)->di_size >= ((lbn) + 1) << (fs)->fs_bshift) \
        !           402:            ? (fs)->fs_bsize \
        !           403:            : (fragroundup(fs, blkoff(fs, (dip)->di_size))))
        !           404: 
        !           405: /*
        !           406:  * Number of disk sectors per block; assumes DEV_BSIZE byte sector size.
        !           407:  */
        !           408: #define        NSPB(fs)        ((fs)->fs_nspf << (fs)->fs_fragshift)
        !           409: #define        NSPF(fs)        ((fs)->fs_nspf)
        !           410: 
        !           411: /*
        !           412:  * INOPB is the number of inodes in a secondary storage block.
        !           413:  */
        !           414: #define        INOPB(fs)       ((fs)->fs_inopb)
        !           415: #define        INOPF(fs)       ((fs)->fs_inopb >> (fs)->fs_fragshift)
        !           416: 
        !           417: /*
        !           418:  * NINDIR is the number of indirects in a file system block.
        !           419:  */
        !           420: #define        NINDIR(fs)      ((fs)->fs_nindir)
        !           421: 
        !           422: #ifdef KERNEL
        !           423: struct fs *getfs();
        !           424: struct fs *mountfs();
        !           425: #endif

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