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1.1 ! root 1: /* ! 2: * Copyright (c) 1999 Apple Computer, Inc. All rights reserved. ! 3: * ! 4: * @APPLE_LICENSE_HEADER_START@ ! 5: * ! 6: * Portions Copyright (c) 1999 Apple Computer, Inc. All Rights ! 7: * Reserved. This file contains Original Code and/or Modifications of ! 8: * Original Code as defined in and that are subject to the Apple Public ! 9: * Source License Version 1.1 (the "License"). You may not use this file ! 10: * except in compliance with the License. Please obtain a copy of the ! 11: * License at http://www.apple.com/publicsource and read it before using ! 12: * this file. ! 13: * ! 14: * The Original Code and all software distributed under the License are ! 15: * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER ! 16: * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, ! 17: * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, ! 18: * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the ! 19: * License for the specific language governing rights and limitations ! 20: * under the License. ! 21: * ! 22: * @APPLE_LICENSE_HEADER_END@ ! 23: */ ! 24: ! 25: /* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */ ! 26: /* ! 27: * Copyright (c) 1982, 1986, 1993 ! 28: * The Regents of the University of California. All rights reserved. ! 29: * ! 30: * Redistribution and use in source and binary forms, with or without ! 31: * modification, are permitted provided that the following conditions ! 32: * are met: ! 33: * 1. Redistributions of source code must retain the above copyright ! 34: * notice, this list of conditions and the following disclaimer. ! 35: * 2. Redistributions in binary form must reproduce the above copyright ! 36: * notice, this list of conditions and the following disclaimer in the ! 37: * documentation and/or other materials provided with the distribution. ! 38: * 3. All advertising materials mentioning features or use of this software ! 39: * must display the following acknowledgement: ! 40: * This product includes software developed by the University of ! 41: * California, Berkeley and its contributors. ! 42: * 4. Neither the name of the University nor the names of its contributors ! 43: * may be used to endorse or promote products derived from this software ! 44: * without specific prior written permission. ! 45: * ! 46: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND ! 47: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE ! 48: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ! 49: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE ! 50: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL ! 51: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS ! 52: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) ! 53: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT ! 54: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY ! 55: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF ! 56: * SUCH DAMAGE. ! 57: * ! 58: * @(#)fs.h 8.13 (Berkeley) 3/21/95 ! 59: */ ! 60: ! 61: /* ! 62: * Each disk drive contains some number of file systems. ! 63: * A file system consists of a number of cylinder groups. ! 64: * Each cylinder group has inodes and data. ! 65: * ! 66: * A file system is described by its super-block, which in turn ! 67: * describes the cylinder groups. The super-block is critical ! 68: * data and is replicated in each cylinder group to protect against ! 69: * catastrophic loss. This is done at `newfs' time and the critical ! 70: * super-block data does not change, so the copies need not be ! 71: * referenced further unless disaster strikes. ! 72: * ! 73: * For file system fs, the offsets of the various blocks of interest ! 74: * are given in the super block as: ! 75: * [fs->fs_sblkno] Super-block ! 76: * [fs->fs_cblkno] Cylinder group block ! 77: * [fs->fs_iblkno] Inode blocks ! 78: * [fs->fs_dblkno] Data blocks ! 79: * The beginning of cylinder group cg in fs, is given by ! 80: * the ``cgbase(fs, cg)'' macro. ! 81: * ! 82: * The first boot and super blocks are given in absolute disk addresses. ! 83: * The byte-offset forms are preferred, as they don't imply a sector size. ! 84: */ ! 85: #define BBSIZE 8192 ! 86: #define SBSIZE 8192 ! 87: #define BBOFF ((off_t)(0)) ! 88: #define SBOFF ((off_t)(BBOFF + BBSIZE)) ! 89: #define BBLOCK ((ufs_daddr_t)(0)) ! 90: #define SBLOCK ((ufs_daddr_t)(BBLOCK + BBSIZE / DEV_BSIZE)) ! 91: ! 92: /* ! 93: * Addresses stored in inodes are capable of addressing fragments ! 94: * of `blocks'. File system blocks of at most size MAXBSIZE can ! 95: * be optionally broken into 2, 4, or 8 pieces, each of which is ! 96: * addressible; these pieces may be DEV_BSIZE, or some multiple of ! 97: * a DEV_BSIZE unit. ! 98: * ! 99: * Large files consist of exclusively large data blocks. To avoid ! 100: * undue wasted disk space, the last data block of a small file may be ! 101: * allocated as only as many fragments of a large block as are ! 102: * necessary. The file system format retains only a single pointer ! 103: * to such a fragment, which is a piece of a single large block that ! 104: * has been divided. The size of such a fragment is determinable from ! 105: * information in the inode, using the ``blksize(fs, ip, lbn)'' macro. ! 106: * ! 107: * The file system records space availability at the fragment level; ! 108: * to determine block availability, aligned fragments are examined. ! 109: */ ! 110: ! 111: /* ! 112: * MINBSIZE is the smallest allowable block size. ! 113: * In order to insure that it is possible to create files of size ! 114: * 2^32 with only two levels of indirection, MINBSIZE is set to 4096. ! 115: * MINBSIZE must be big enough to hold a cylinder group block, ! 116: * thus changes to (struct cg) must keep its size within MINBSIZE. ! 117: * Note that super blocks are always of size SBSIZE, ! 118: * and that both SBSIZE and MAXBSIZE must be >= MINBSIZE. ! 119: */ ! 120: #define MINBSIZE 4096 ! 121: ! 122: /* ! 123: * The path name on which the file system is mounted is maintained ! 124: * in fs_fsmnt. MAXMNTLEN defines the amount of space allocated in ! 125: * the super block for this name. ! 126: */ ! 127: #define MAXMNTLEN 512 ! 128: ! 129: /* ! 130: * The limit on the amount of summary information per file system ! 131: * is defined by MAXCSBUFS. It is currently parameterized for a ! 132: * size of 128 bytes (2 million cylinder groups on machines with ! 133: * 32-bit pointers, and 1 million on 64-bit machines). One pointer ! 134: * is taken away to point to an array of cluster sizes that is ! 135: * computed as cylinder groups are inspected. ! 136: */ ! 137: #define MAXCSBUFS ((128 / sizeof(void *)) - 1) ! 138: ! 139: /* ! 140: * A summary of contiguous blocks of various sizes is maintained ! 141: * in each cylinder group. Normally this is set by the initial ! 142: * value of fs_maxcontig. To conserve space, a maximum summary size ! 143: * is set by FS_MAXCONTIG. ! 144: */ ! 145: #define FS_MAXCONTIG 16 ! 146: ! 147: /* ! 148: * MINFREE gives the minimum acceptable percentage of file system ! 149: * blocks which may be free. If the freelist drops below this level ! 150: * only the superuser may continue to allocate blocks. This may ! 151: * be set to 0 if no reserve of free blocks is deemed necessary, ! 152: * however throughput drops by fifty percent if the file system ! 153: * is run at between 95% and 100% full; thus the minimum default ! 154: * value of fs_minfree is 5%. However, to get good clustering ! 155: * performance, 10% is a better choice. hence we use 10% as our ! 156: * default value. With 10% free space, fragmentation is not a ! 157: * problem, so we choose to optimize for time. ! 158: */ ! 159: #define MINFREE 5 ! 160: #define DEFAULTOPT FS_OPTTIME ! 161: ! 162: /* ! 163: * Per cylinder group information; summarized in blocks allocated ! 164: * from first cylinder group data blocks. These blocks have to be ! 165: * read in from fs_csaddr (size fs_cssize) in addition to the ! 166: * super block. ! 167: * ! 168: * N.B. sizeof(struct csum) must be a power of two in order for ! 169: * the ``fs_cs'' macro to work (see below). ! 170: */ ! 171: struct csum { ! 172: int32_t cs_ndir; /* number of directories */ ! 173: int32_t cs_nbfree; /* number of free blocks */ ! 174: int32_t cs_nifree; /* number of free inodes */ ! 175: int32_t cs_nffree; /* number of free frags */ ! 176: }; ! 177: ! 178: /* ! 179: * Super block for an FFS file system. ! 180: */ ! 181: struct fs { ! 182: int32_t fs_firstfield; /* historic file system linked list, */ ! 183: int32_t fs_unused_1; /* used for incore super blocks */ ! 184: ufs_daddr_t fs_sblkno; /* addr of super-block in filesys */ ! 185: ufs_daddr_t fs_cblkno; /* offset of cyl-block in filesys */ ! 186: ufs_daddr_t fs_iblkno; /* offset of inode-blocks in filesys */ ! 187: ufs_daddr_t fs_dblkno; /* offset of first data after cg */ ! 188: int32_t fs_cgoffset; /* cylinder group offset in cylinder */ ! 189: int32_t fs_cgmask; /* used to calc mod fs_ntrak */ ! 190: time_t fs_time; /* last time written */ ! 191: int32_t fs_size; /* number of blocks in fs */ ! 192: int32_t fs_dsize; /* number of data blocks in fs */ ! 193: int32_t fs_ncg; /* number of cylinder groups */ ! 194: int32_t fs_bsize; /* size of basic blocks in fs */ ! 195: int32_t fs_fsize; /* size of frag blocks in fs */ ! 196: int32_t fs_frag; /* number of frags in a block in fs */ ! 197: /* these are configuration parameters */ ! 198: int32_t fs_minfree; /* minimum percentage of free blocks */ ! 199: int32_t fs_rotdelay; /* num of ms for optimal next block */ ! 200: int32_t fs_rps; /* disk revolutions per second */ ! 201: /* these fields can be computed from the others */ ! 202: int32_t fs_bmask; /* ``blkoff'' calc of blk offsets */ ! 203: int32_t fs_fmask; /* ``fragoff'' calc of frag offsets */ ! 204: int32_t fs_bshift; /* ``lblkno'' calc of logical blkno */ ! 205: int32_t fs_fshift; /* ``numfrags'' calc number of frags */ ! 206: /* these are configuration parameters */ ! 207: int32_t fs_maxcontig; /* max number of contiguous blks */ ! 208: int32_t fs_maxbpg; /* max number of blks per cyl group */ ! 209: /* these fields can be computed from the others */ ! 210: int32_t fs_fragshift; /* block to frag shift */ ! 211: int32_t fs_fsbtodb; /* fsbtodb and dbtofsb shift constant */ ! 212: int32_t fs_sbsize; /* actual size of super block */ ! 213: int32_t fs_csmask; /* csum block offset */ ! 214: int32_t fs_csshift; /* csum block number */ ! 215: int32_t fs_nindir; /* value of NINDIR */ ! 216: int32_t fs_inopb; /* value of INOPB */ ! 217: int32_t fs_nspf; /* value of NSPF */ ! 218: /* yet another configuration parameter */ ! 219: int32_t fs_optim; /* optimization preference, see below */ ! 220: /* these fields are derived from the hardware */ ! 221: int32_t fs_npsect; /* # sectors/track including spares */ ! 222: int32_t fs_interleave; /* hardware sector interleave */ ! 223: int32_t fs_trackskew; /* sector 0 skew, per track */ ! 224: int32_t fs_headswitch; /* head switch time, usec */ ! 225: int32_t fs_trkseek; /* track-to-track seek, usec */ ! 226: /* sizes determined by number of cylinder groups and their sizes */ ! 227: ufs_daddr_t fs_csaddr; /* blk addr of cyl grp summary area */ ! 228: int32_t fs_cssize; /* size of cyl grp summary area */ ! 229: int32_t fs_cgsize; /* cylinder group size */ ! 230: /* these fields are derived from the hardware */ ! 231: int32_t fs_ntrak; /* tracks per cylinder */ ! 232: int32_t fs_nsect; /* sectors per track */ ! 233: int32_t fs_spc; /* sectors per cylinder */ ! 234: /* this comes from the disk driver partitioning */ ! 235: int32_t fs_ncyl; /* cylinders in file system */ ! 236: /* these fields can be computed from the others */ ! 237: int32_t fs_cpg; /* cylinders per group */ ! 238: int32_t fs_ipg; /* inodes per group */ ! 239: int32_t fs_fpg; /* blocks per group * fs_frag */ ! 240: /* this data must be re-computed after crashes */ ! 241: struct csum fs_cstotal; /* cylinder summary information */ ! 242: /* these fields are cleared at mount time */ ! 243: int8_t fs_fmod; /* super block modified flag */ ! 244: int8_t fs_clean; /* file system is clean flag */ ! 245: int8_t fs_ronly; /* mounted read-only flag */ ! 246: int8_t fs_flags; /* currently unused flag */ ! 247: u_char fs_fsmnt[MAXMNTLEN]; /* name mounted on */ ! 248: /* these fields retain the current block allocation info */ ! 249: int32_t fs_cgrotor; /* last cg searched */ ! 250: struct csum *fs_csp[MAXCSBUFS];/* list of fs_cs info buffers */ ! 251: int32_t *fs_maxcluster; /* max cluster in each cyl group */ ! 252: int32_t fs_cpc; /* cyl per cycle in postbl */ ! 253: int16_t fs_opostbl[16][8]; /* old rotation block list head */ ! 254: int32_t fs_sparecon[50]; /* reserved for future constants */ ! 255: int32_t fs_contigsumsize; /* size of cluster summary array */ ! 256: int32_t fs_maxsymlinklen; /* max length of an internal symlink */ ! 257: int32_t fs_inodefmt; /* format of on-disk inodes */ ! 258: u_int64_t fs_maxfilesize; /* maximum representable file size */ ! 259: int64_t fs_qbmask; /* ~fs_bmask for use with 64-bit size */ ! 260: int64_t fs_qfmask; /* ~fs_fmask for use with 64-bit size */ ! 261: int32_t fs_state; /* validate fs_clean field */ ! 262: int32_t fs_postblformat; /* format of positional layout tables */ ! 263: int32_t fs_nrpos; /* number of rotational positions */ ! 264: int32_t fs_postbloff; /* (u_int16) rotation block list head */ ! 265: int32_t fs_rotbloff; /* (u_int8) blocks for each rotation */ ! 266: int32_t fs_magic; /* magic number */ ! 267: u_int8_t fs_space[1]; /* list of blocks for each rotation */ ! 268: /* actually longer */ ! 269: }; ! 270: ! 271: /* ! 272: * Filesystem identification ! 273: */ ! 274: #define FS_MAGIC 0x011954 /* the fast filesystem magic number */ ! 275: #define FS_OKAY 0x7c269d38 /* superblock checksum */ ! 276: #define FS_42INODEFMT -1 /* 4.2BSD inode format */ ! 277: #define FS_44INODEFMT 2 /* 4.4BSD inode format */ ! 278: /* ! 279: * Preference for optimization. ! 280: */ ! 281: #define FS_OPTTIME 0 /* minimize allocation time */ ! 282: #define FS_OPTSPACE 1 /* minimize disk fragmentation */ ! 283: ! 284: /* ! 285: * Rotational layout table format types ! 286: */ ! 287: #define FS_42POSTBLFMT -1 /* 4.2BSD rotational table format */ ! 288: #define FS_DYNAMICPOSTBLFMT 1 /* dynamic rotational table format */ ! 289: /* ! 290: * Macros for access to superblock array structures ! 291: */ ! 292: #define fs_postbl(fs, cylno) \ ! 293: (((fs)->fs_postblformat == FS_42POSTBLFMT) \ ! 294: ? ((fs)->fs_opostbl[cylno]) \ ! 295: : ((int16_t *)((u_int8_t *)(fs) + \ ! 296: (fs)->fs_postbloff) + (cylno) * (fs)->fs_nrpos)) ! 297: #define fs_rotbl(fs) \ ! 298: (((fs)->fs_postblformat == FS_42POSTBLFMT) \ ! 299: ? ((fs)->fs_space) \ ! 300: : ((u_int8_t *)((u_int8_t *)(fs) + (fs)->fs_rotbloff))) ! 301: ! 302: /* ! 303: * The size of a cylinder group is calculated by CGSIZE. The maximum size ! 304: * is limited by the fact that cylinder groups are at most one block. ! 305: * Its size is derived from the size of the maps maintained in the ! 306: * cylinder group and the (struct cg) size. ! 307: */ ! 308: #define CGSIZE(fs) \ ! 309: /* base cg */ (sizeof(struct cg) + sizeof(int32_t) + \ ! 310: /* blktot size */ (fs)->fs_cpg * sizeof(int32_t) + \ ! 311: /* blks size */ (fs)->fs_cpg * (fs)->fs_nrpos * sizeof(int16_t) + \ ! 312: /* inode map */ howmany((fs)->fs_ipg, NBBY) + \ ! 313: /* block map */ howmany((fs)->fs_cpg * (fs)->fs_spc / NSPF(fs), NBBY) +\ ! 314: /* if present */ ((fs)->fs_contigsumsize <= 0 ? 0 : \ ! 315: /* cluster sum */ (fs)->fs_contigsumsize * sizeof(int32_t) + \ ! 316: /* cluster map */ howmany((fs)->fs_cpg * (fs)->fs_spc / NSPB(fs), NBBY))) ! 317: ! 318: /* ! 319: * Convert cylinder group to base address of its global summary info. ! 320: * ! 321: * N.B. This macro assumes that sizeof(struct csum) is a power of two. ! 322: */ ! 323: #define fs_cs(fs, indx) \ ! 324: fs_csp[(indx) >> (fs)->fs_csshift][(indx) & ~(fs)->fs_csmask] ! 325: ! 326: /* ! 327: * Cylinder group block for a file system. ! 328: */ ! 329: #define CG_MAGIC 0x090255 ! 330: struct cg { ! 331: int32_t cg_firstfield; /* historic cyl groups linked list */ ! 332: int32_t cg_magic; /* magic number */ ! 333: time_t cg_time; /* time last written */ ! 334: int32_t cg_cgx; /* we are the cgx'th cylinder group */ ! 335: int16_t cg_ncyl; /* number of cyl's this cg */ ! 336: int16_t cg_niblk; /* number of inode blocks this cg */ ! 337: int32_t cg_ndblk; /* number of data blocks this cg */ ! 338: struct csum cg_cs; /* cylinder summary information */ ! 339: int32_t cg_rotor; /* position of last used block */ ! 340: int32_t cg_frotor; /* position of last used frag */ ! 341: int32_t cg_irotor; /* position of last used inode */ ! 342: int32_t cg_frsum[MAXFRAG]; /* counts of available frags */ ! 343: int32_t cg_btotoff; /* (int32) block totals per cylinder */ ! 344: int32_t cg_boff; /* (u_int16) free block positions */ ! 345: int32_t cg_iusedoff; /* (u_int8) used inode map */ ! 346: int32_t cg_freeoff; /* (u_int8) free block map */ ! 347: int32_t cg_nextfreeoff; /* (u_int8) next available space */ ! 348: int32_t cg_clustersumoff; /* (u_int32) counts of avail clusters */ ! 349: int32_t cg_clusteroff; /* (u_int8) free cluster map */ ! 350: int32_t cg_nclusterblks; /* number of clusters this cg */ ! 351: int32_t cg_sparecon[13]; /* reserved for future use */ ! 352: u_int8_t cg_space[1]; /* space for cylinder group maps */ ! 353: /* actually longer */ ! 354: }; ! 355: ! 356: /* ! 357: * Macros for access to cylinder group array structures ! 358: */ ! 359: #define cg_blktot(cgp) \ ! 360: (((cgp)->cg_magic != CG_MAGIC) \ ! 361: ? (((struct ocg *)(cgp))->cg_btot) \ ! 362: : ((int32_t *)((u_int8_t *)(cgp) + (cgp)->cg_btotoff))) ! 363: #define cg_blks(fs, cgp, cylno) \ ! 364: (((cgp)->cg_magic != CG_MAGIC) \ ! 365: ? (((struct ocg *)(cgp))->cg_b[cylno]) \ ! 366: : ((int16_t *)((u_int8_t *)(cgp) + \ ! 367: (cgp)->cg_boff) + (cylno) * (fs)->fs_nrpos)) ! 368: #define cg_inosused(cgp) \ ! 369: (((cgp)->cg_magic != CG_MAGIC) \ ! 370: ? (((struct ocg *)(cgp))->cg_iused) \ ! 371: : ((u_int8_t *)((u_int8_t *)(cgp) + (cgp)->cg_iusedoff))) ! 372: #define cg_blksfree(cgp) \ ! 373: (((cgp)->cg_magic != CG_MAGIC) \ ! 374: ? (((struct ocg *)(cgp))->cg_free) \ ! 375: : ((u_int8_t *)((u_int8_t *)(cgp) + (cgp)->cg_freeoff))) ! 376: #define cg_chkmagic(cgp) \ ! 377: ((cgp)->cg_magic == CG_MAGIC || ((struct ocg *)(cgp))->cg_magic == CG_MAGIC) ! 378: #define cg_clustersfree(cgp) \ ! 379: ((u_int8_t *)((u_int8_t *)(cgp) + (cgp)->cg_clusteroff)) ! 380: #define cg_clustersum(cgp) \ ! 381: ((int32_t *)((u_int8_t *)(cgp) + (cgp)->cg_clustersumoff)) ! 382: ! 383: /* ! 384: * The following structure is defined ! 385: * for compatibility with old file systems. ! 386: */ ! 387: struct ocg { ! 388: int32_t cg_firstfield; /* historic linked list of cyl groups */ ! 389: int32_t cg_unused_1; /* used for incore cyl groups */ ! 390: time_t cg_time; /* time last written */ ! 391: int32_t cg_cgx; /* we are the cgx'th cylinder group */ ! 392: int16_t cg_ncyl; /* number of cyl's this cg */ ! 393: int16_t cg_niblk; /* number of inode blocks this cg */ ! 394: int32_t cg_ndblk; /* number of data blocks this cg */ ! 395: struct csum cg_cs; /* cylinder summary information */ ! 396: int32_t cg_rotor; /* position of last used block */ ! 397: int32_t cg_frotor; /* position of last used frag */ ! 398: int32_t cg_irotor; /* position of last used inode */ ! 399: int32_t cg_frsum[8]; /* counts of available frags */ ! 400: int32_t cg_btot[32]; /* block totals per cylinder */ ! 401: int16_t cg_b[32][8]; /* positions of free blocks */ ! 402: u_int8_t cg_iused[256]; /* used inode map */ ! 403: int32_t cg_magic; /* magic number */ ! 404: u_int8_t cg_free[1]; /* free block map */ ! 405: /* actually longer */ ! 406: }; ! 407: ! 408: /* ! 409: * Turn file system block numbers into disk block addresses. ! 410: * This maps file system blocks to device size blocks. ! 411: */ ! 412: #define fsbtodb(fs, b) ((b) << (fs)->fs_fsbtodb) ! 413: #define dbtofsb(fs, b) ((b) >> (fs)->fs_fsbtodb) ! 414: ! 415: /* ! 416: * Cylinder group macros to locate things in cylinder groups. ! 417: * They calc file system addresses of cylinder group data structures. ! 418: */ ! 419: #define cgbase(fs, c) ((ufs_daddr_t)((fs)->fs_fpg * (c))) ! 420: #define cgdmin(fs, c) (cgstart(fs, c) + (fs)->fs_dblkno) /* 1st data */ ! 421: #define cgimin(fs, c) (cgstart(fs, c) + (fs)->fs_iblkno) /* inode blk */ ! 422: #define cgsblock(fs, c) (cgstart(fs, c) + (fs)->fs_sblkno) /* super blk */ ! 423: #define cgtod(fs, c) (cgstart(fs, c) + (fs)->fs_cblkno) /* cg block */ ! 424: #define cgstart(fs, c) \ ! 425: (cgbase(fs, c) + (fs)->fs_cgoffset * ((c) & ~((fs)->fs_cgmask))) ! 426: ! 427: /* ! 428: * Macros for handling inode numbers: ! 429: * inode number to file system block offset. ! 430: * inode number to cylinder group number. ! 431: * inode number to file system block address. ! 432: */ ! 433: #define ino_to_cg(fs, x) ((x) / (fs)->fs_ipg) ! 434: #define ino_to_fsba(fs, x) \ ! 435: ((ufs_daddr_t)(cgimin(fs, ino_to_cg(fs, x)) + \ ! 436: (blkstofrags((fs), (((x) % (fs)->fs_ipg) / INOPB(fs)))))) ! 437: #define ino_to_fsbo(fs, x) ((x) % INOPB(fs)) ! 438: ! 439: /* ! 440: * Give cylinder group number for a file system block. ! 441: * Give cylinder group block number for a file system block. ! 442: */ ! 443: #define dtog(fs, d) ((d) / (fs)->fs_fpg) ! 444: #define dtogd(fs, d) ((d) % (fs)->fs_fpg) ! 445: ! 446: /* ! 447: * Extract the bits for a block from a map. ! 448: * Compute the cylinder and rotational position of a cyl block addr. ! 449: */ ! 450: #define blkmap(fs, map, loc) \ ! 451: (((map)[(loc) / NBBY] >> ((loc) % NBBY)) & (0xff >> (NBBY - (fs)->fs_frag))) ! 452: #define cbtocylno(fs, bno) \ ! 453: ((bno) * NSPF(fs) / (fs)->fs_spc) ! 454: #define cbtorpos(fs, bno) \ ! 455: (((bno) * NSPF(fs) % (fs)->fs_spc / (fs)->fs_nsect * (fs)->fs_trackskew + \ ! 456: (bno) * NSPF(fs) % (fs)->fs_spc % (fs)->fs_nsect * (fs)->fs_interleave) % \ ! 457: (fs)->fs_nsect * (fs)->fs_nrpos / (fs)->fs_npsect) ! 458: ! 459: /* ! 460: * The following macros optimize certain frequently calculated ! 461: * quantities by using shifts and masks in place of divisions ! 462: * modulos and multiplications. ! 463: */ ! 464: #define blkoff(fs, loc) /* calculates (loc % fs->fs_bsize) */ \ ! 465: ((loc) & (fs)->fs_qbmask) ! 466: #define fragoff(fs, loc) /* calculates (loc % fs->fs_fsize) */ \ ! 467: ((loc) & (fs)->fs_qfmask) ! 468: #define lblktosize(fs, blk) /* calculates (blk * fs->fs_bsize) */ \ ! 469: ((blk) << (fs)->fs_bshift) ! 470: #define lblkno(fs, loc) /* calculates (loc / fs->fs_bsize) */ \ ! 471: ((loc) >> (fs)->fs_bshift) ! 472: #define numfrags(fs, loc) /* calculates (loc / fs->fs_fsize) */ \ ! 473: ((loc) >> (fs)->fs_fshift) ! 474: #define blkroundup(fs, size) /* calculates roundup(size, fs->fs_bsize) */ \ ! 475: (((size) + (fs)->fs_qbmask) & (fs)->fs_bmask) ! 476: #define fragroundup(fs, size) /* calculates roundup(size, fs->fs_fsize) */ \ ! 477: (((size) + (fs)->fs_qfmask) & (fs)->fs_fmask) ! 478: #define fragstoblks(fs, frags) /* calculates (frags / fs->fs_frag) */ \ ! 479: ((frags) >> (fs)->fs_fragshift) ! 480: #define blkstofrags(fs, blks) /* calculates (blks * fs->fs_frag) */ \ ! 481: ((blks) << (fs)->fs_fragshift) ! 482: #define fragnum(fs, fsb) /* calculates (fsb % fs->fs_frag) */ \ ! 483: ((fsb) & ((fs)->fs_frag - 1)) ! 484: #define blknum(fs, fsb) /* calculates rounddown(fsb, fs->fs_frag) */ \ ! 485: ((fsb) &~ ((fs)->fs_frag - 1)) ! 486: ! 487: /* ! 488: * Determine the number of available frags given a ! 489: * percentage to hold in reserve. ! 490: */ ! 491: #define freespace(fs, percentreserved) \ ! 492: (blkstofrags((fs), (fs)->fs_cstotal.cs_nbfree) + \ ! 493: (fs)->fs_cstotal.cs_nffree - ((fs)->fs_dsize * (percentreserved) / 100)) ! 494: ! 495: /* ! 496: * Determining the size of a file block in the file system. ! 497: */ ! 498: #define blksize(fs, ip, lbn) \ ! 499: (((lbn) >= NDADDR || (ip)->i_size >= ((lbn) + 1) << (fs)->fs_bshift) \ ! 500: ? (fs)->fs_bsize \ ! 501: : (fragroundup(fs, blkoff(fs, (ip)->i_size)))) ! 502: #define dblksize(fs, dip, lbn) \ ! 503: (((lbn) >= NDADDR || (dip)->di_size >= ((lbn) + 1) << (fs)->fs_bshift) \ ! 504: ? (fs)->fs_bsize \ ! 505: : (fragroundup(fs, blkoff(fs, (dip)->di_size)))) ! 506: ! 507: /* ! 508: * Number of disk sectors per block/fragment; assumes DEV_BSIZE byte ! 509: * sector size. ! 510: */ ! 511: #define NSPB(fs) ((fs)->fs_nspf << (fs)->fs_fragshift) ! 512: #define NSPF(fs) ((fs)->fs_nspf) ! 513: ! 514: /* ! 515: * Number of inodes in a secondary storage block/fragment. ! 516: */ ! 517: #define INOPB(fs) ((fs)->fs_inopb) ! 518: #define INOPF(fs) ((fs)->fs_inopb >> (fs)->fs_fragshift) ! 519: ! 520: /* ! 521: * Number of indirects in a file system block. ! 522: */ ! 523: #define NINDIR(fs) ((fs)->fs_nindir) ! 524: ! 525: /* ! 526: * This macro controls whether the file system format is byte swapped or not. ! 527: * At NeXT, all little endian machines read and write big endian file systems. ! 528: */ ! 529: #define BIG_ENDIAN_FS (__LITTLE_ENDIAN__) ! 530: ! 531: extern int inside[], around[]; ! 532: extern u_char *fragtbl[];
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