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1.1 ! root 1: /* ! 2: * Copyright (c) 2000 Apple Computer, Inc. All rights reserved. ! 3: * ! 4: * @APPLE_LICENSE_HEADER_START@ ! 5: * ! 6: * The contents of this file constitute Original Code as defined in and ! 7: * are subject to the Apple Public Source License Version 1.1 (the ! 8: * "License"). You may not use this file except in compliance with the ! 9: * License. Please obtain a copy of the License at ! 10: * http://www.apple.com/publicsource and read it before using this file. ! 11: * ! 12: * This Original Code and all software distributed under the License are ! 13: * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER ! 14: * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, ! 15: * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, ! 16: * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the ! 17: * License for the specific language governing rights and limitations ! 18: * under the License. ! 19: * ! 20: * @APPLE_LICENSE_HEADER_END@ ! 21: */ ! 22: /* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */ ! 23: /* ! 24: * Copyright (c) 1982, 1986, 1993 ! 25: * The Regents of the University of California. All rights reserved. ! 26: * ! 27: * Redistribution and use in source and binary forms, with or without ! 28: * modification, are permitted provided that the following conditions ! 29: * are met: ! 30: * 1. Redistributions of source code must retain the above copyright ! 31: * notice, this list of conditions and the following disclaimer. ! 32: * 2. Redistributions in binary form must reproduce the above copyright ! 33: * notice, this list of conditions and the following disclaimer in the ! 34: * documentation and/or other materials provided with the distribution. ! 35: * 3. All advertising materials mentioning features or use of this software ! 36: * must display the following acknowledgement: ! 37: * This product includes software developed by the University of ! 38: * California, Berkeley and its contributors. ! 39: * 4. Neither the name of the University nor the names of its contributors ! 40: * may be used to endorse or promote products derived from this software ! 41: * without specific prior written permission. ! 42: * ! 43: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND ! 44: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE ! 45: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ! 46: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE ! 47: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL ! 48: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS ! 49: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) ! 50: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT ! 51: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY ! 52: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF ! 53: * SUCH DAMAGE. ! 54: * ! 55: * @(#)fs.h 8.13 (Berkeley) 3/21/95 ! 56: */ ! 57: #ifndef _FFS_FS_H_ ! 58: #define _FFS_FS_H_ ! 59: ! 60: /* ! 61: * Each disk drive contains some number of file systems. ! 62: * A file system consists of a number of cylinder groups. ! 63: * Each cylinder group has inodes and data. ! 64: * ! 65: * A file system is described by its super-block, which in turn ! 66: * describes the cylinder groups. The super-block is critical ! 67: * data and is replicated in each cylinder group to protect against ! 68: * catastrophic loss. This is done at `newfs' time and the critical ! 69: * super-block data does not change, so the copies need not be ! 70: * referenced further unless disaster strikes. ! 71: * ! 72: * For file system fs, the offsets of the various blocks of interest ! 73: * are given in the super block as: ! 74: * [fs->fs_sblkno] Super-block ! 75: * [fs->fs_cblkno] Cylinder group block ! 76: * [fs->fs_iblkno] Inode blocks ! 77: * [fs->fs_dblkno] Data blocks ! 78: * The beginning of cylinder group cg in fs, is given by ! 79: * the ``cgbase(fs, cg)'' macro. ! 80: * ! 81: * The first boot and super blocks are given in absolute disk addresses. ! 82: * The byte-offset forms are preferred, as they don't imply a sector size. ! 83: */ ! 84: #define BBSIZE 8192 ! 85: #define SBSIZE 8192 ! 86: #define BBOFF ((off_t)(0)) ! 87: #define SBOFF ((off_t)(BBOFF + BBSIZE)) ! 88: #define BBLOCK ((ufs_daddr_t)(0)) ! 89: #define SBLOCK ((ufs_daddr_t)(BBLOCK + BBSIZE / DEV_BSIZE)) ! 90: ! 91: /* ! 92: * Addresses stored in inodes are capable of addressing fragments ! 93: * of `blocks'. File system blocks of at most size MAXBSIZE can ! 94: * be optionally broken into 2, 4, or 8 pieces, each of which is ! 95: * addressible; these pieces may be DEV_BSIZE, or some multiple of ! 96: * a DEV_BSIZE unit. ! 97: * ! 98: * Large files consist of exclusively large data blocks. To avoid ! 99: * undue wasted disk space, the last data block of a small file may be ! 100: * allocated as only as many fragments of a large block as are ! 101: * necessary. The file system format retains only a single pointer ! 102: * to such a fragment, which is a piece of a single large block that ! 103: * has been divided. The size of such a fragment is determinable from ! 104: * information in the inode, using the ``blksize(fs, ip, lbn)'' macro. ! 105: * ! 106: * The file system records space availability at the fragment level; ! 107: * to determine block availability, aligned fragments are examined. ! 108: */ ! 109: ! 110: /* ! 111: * MINBSIZE is the smallest allowable block size. ! 112: * In order to insure that it is possible to create files of size ! 113: * 2^32 with only two levels of indirection, MINBSIZE is set to 4096. ! 114: * MINBSIZE must be big enough to hold a cylinder group block, ! 115: * thus changes to (struct cg) must keep its size within MINBSIZE. ! 116: * Note that super blocks are always of size SBSIZE, ! 117: * and that both SBSIZE and MAXBSIZE must be >= MINBSIZE. ! 118: */ ! 119: #define MINBSIZE 4096 ! 120: ! 121: /* ! 122: * The path name on which the file system is mounted is maintained ! 123: * in fs_fsmnt. MAXMNTLEN defines the amount of space allocated in ! 124: * the super block for this name. ! 125: */ ! 126: #define MAXMNTLEN 512 ! 127: ! 128: /* ! 129: * The limit on the amount of summary information per file system ! 130: * is defined by MAXCSBUFS. It is currently parameterized for a ! 131: * size of 128 bytes (2 million cylinder groups on machines with ! 132: * 32-bit pointers, and 1 million on 64-bit machines). One pointer ! 133: * is taken away to point to an array of cluster sizes that is ! 134: * computed as cylinder groups are inspected. ! 135: */ ! 136: #define MAXCSBUFS ((128 / sizeof(void *)) - 1) ! 137: ! 138: /* ! 139: * A summary of contiguous blocks of various sizes is maintained ! 140: * in each cylinder group. Normally this is set by the initial ! 141: * value of fs_maxcontig. To conserve space, a maximum summary size ! 142: * is set by FS_MAXCONTIG. ! 143: */ ! 144: #define FS_MAXCONTIG 16 ! 145: ! 146: /* ! 147: * MINFREE gives the minimum acceptable percentage of file system ! 148: * blocks which may be free. If the freelist drops below this level ! 149: * only the superuser may continue to allocate blocks. This may ! 150: * be set to 0 if no reserve of free blocks is deemed necessary, ! 151: * however throughput drops by fifty percent if the file system ! 152: * is run at between 95% and 100% full; thus the minimum default ! 153: * value of fs_minfree is 5%. However, to get good clustering ! 154: * performance, 10% is a better choice. hence we use 10% as our ! 155: * default value. With 10% free space, fragmentation is not a ! 156: * problem, so we choose to optimize for time. ! 157: */ ! 158: #define MINFREE 5 ! 159: #define DEFAULTOPT FS_OPTTIME ! 160: ! 161: /* ! 162: * Per cylinder group information; summarized in blocks allocated ! 163: * from first cylinder group data blocks. These blocks have to be ! 164: * read in from fs_csaddr (size fs_cssize) in addition to the ! 165: * super block. ! 166: * ! 167: * N.B. sizeof(struct csum) must be a power of two in order for ! 168: * the ``fs_cs'' macro to work (see below). ! 169: */ ! 170: struct csum { ! 171: int32_t cs_ndir; /* number of directories */ ! 172: int32_t cs_nbfree; /* number of free blocks */ ! 173: int32_t cs_nifree; /* number of free inodes */ ! 174: int32_t cs_nffree; /* number of free frags */ ! 175: }; ! 176: ! 177: /* ! 178: * Super block for an FFS file system. ! 179: */ ! 180: struct fs { ! 181: int32_t fs_firstfield; /* historic file system linked list, */ ! 182: int32_t fs_unused_1; /* used for incore super blocks */ ! 183: ufs_daddr_t fs_sblkno; /* addr of super-block in filesys */ ! 184: ufs_daddr_t fs_cblkno; /* offset of cyl-block in filesys */ ! 185: ufs_daddr_t fs_iblkno; /* offset of inode-blocks in filesys */ ! 186: ufs_daddr_t fs_dblkno; /* offset of first data after cg */ ! 187: int32_t fs_cgoffset; /* cylinder group offset in cylinder */ ! 188: int32_t fs_cgmask; /* used to calc mod fs_ntrak */ ! 189: time_t fs_time; /* last time written */ ! 190: int32_t fs_size; /* number of blocks in fs */ ! 191: int32_t fs_dsize; /* number of data blocks in fs */ ! 192: int32_t fs_ncg; /* number of cylinder groups */ ! 193: int32_t fs_bsize; /* size of basic blocks in fs */ ! 194: int32_t fs_fsize; /* size of frag blocks in fs */ ! 195: int32_t fs_frag; /* number of frags in a block in fs */ ! 196: /* these are configuration parameters */ ! 197: int32_t fs_minfree; /* minimum percentage of free blocks */ ! 198: int32_t fs_rotdelay; /* num of ms for optimal next block */ ! 199: int32_t fs_rps; /* disk revolutions per second */ ! 200: /* these fields can be computed from the others */ ! 201: int32_t fs_bmask; /* ``blkoff'' calc of blk offsets */ ! 202: int32_t fs_fmask; /* ``fragoff'' calc of frag offsets */ ! 203: int32_t fs_bshift; /* ``lblkno'' calc of logical blkno */ ! 204: int32_t fs_fshift; /* ``numfrags'' calc number of frags */ ! 205: /* these are configuration parameters */ ! 206: int32_t fs_maxcontig; /* max number of contiguous blks */ ! 207: int32_t fs_maxbpg; /* max number of blks per cyl group */ ! 208: /* these fields can be computed from the others */ ! 209: int32_t fs_fragshift; /* block to frag shift */ ! 210: int32_t fs_fsbtodb; /* fsbtodb and dbtofsb shift constant */ ! 211: int32_t fs_sbsize; /* actual size of super block */ ! 212: int32_t fs_csmask; /* csum block offset */ ! 213: int32_t fs_csshift; /* csum block number */ ! 214: int32_t fs_nindir; /* value of NINDIR */ ! 215: int32_t fs_inopb; /* value of INOPB */ ! 216: int32_t fs_nspf; /* value of NSPF */ ! 217: /* yet another configuration parameter */ ! 218: int32_t fs_optim; /* optimization preference, see below */ ! 219: /* these fields are derived from the hardware */ ! 220: int32_t fs_npsect; /* # sectors/track including spares */ ! 221: int32_t fs_interleave; /* hardware sector interleave */ ! 222: int32_t fs_trackskew; /* sector 0 skew, per track */ ! 223: int32_t fs_headswitch; /* head switch time, usec */ ! 224: int32_t fs_trkseek; /* track-to-track seek, usec */ ! 225: /* sizes determined by number of cylinder groups and their sizes */ ! 226: ufs_daddr_t fs_csaddr; /* blk addr of cyl grp summary area */ ! 227: int32_t fs_cssize; /* size of cyl grp summary area */ ! 228: int32_t fs_cgsize; /* cylinder group size */ ! 229: /* these fields are derived from the hardware */ ! 230: int32_t fs_ntrak; /* tracks per cylinder */ ! 231: int32_t fs_nsect; /* sectors per track */ ! 232: int32_t fs_spc; /* sectors per cylinder */ ! 233: /* this comes from the disk driver partitioning */ ! 234: int32_t fs_ncyl; /* cylinders in file system */ ! 235: /* these fields can be computed from the others */ ! 236: int32_t fs_cpg; /* cylinders per group */ ! 237: int32_t fs_ipg; /* inodes per group */ ! 238: int32_t fs_fpg; /* blocks per group * fs_frag */ ! 239: /* this data must be re-computed after crashes */ ! 240: struct csum fs_cstotal; /* cylinder summary information */ ! 241: /* these fields are cleared at mount time */ ! 242: int8_t fs_fmod; /* super block modified flag */ ! 243: int8_t fs_clean; /* file system is clean flag */ ! 244: int8_t fs_ronly; /* mounted read-only flag */ ! 245: int8_t fs_flags; /* currently unused flag */ ! 246: u_char fs_fsmnt[MAXMNTLEN]; /* name mounted on */ ! 247: /* these fields retain the current block allocation info */ ! 248: int32_t fs_cgrotor; /* last cg searched */ ! 249: struct csum *fs_csp[MAXCSBUFS];/* list of fs_cs info buffers */ ! 250: int32_t *fs_maxcluster; /* max cluster in each cyl group */ ! 251: int32_t fs_cpc; /* cyl per cycle in postbl */ ! 252: int16_t fs_opostbl[16][8]; /* old rotation block list head */ ! 253: int32_t fs_sparecon[50]; /* reserved for future constants */ ! 254: int32_t fs_contigsumsize; /* size of cluster summary array */ ! 255: int32_t fs_maxsymlinklen; /* max length of an internal symlink */ ! 256: int32_t fs_inodefmt; /* format of on-disk inodes */ ! 257: u_int64_t fs_maxfilesize; /* maximum representable file size */ ! 258: int64_t fs_qbmask; /* ~fs_bmask for use with 64-bit size */ ! 259: int64_t fs_qfmask; /* ~fs_fmask for use with 64-bit size */ ! 260: int32_t fs_state; /* validate fs_clean field */ ! 261: int32_t fs_postblformat; /* format of positional layout tables */ ! 262: int32_t fs_nrpos; /* number of rotational positions */ ! 263: int32_t fs_postbloff; /* (u_int16) rotation block list head */ ! 264: int32_t fs_rotbloff; /* (u_int8) blocks for each rotation */ ! 265: int32_t fs_magic; /* magic number */ ! 266: u_int8_t fs_space[1]; /* list of blocks for each rotation */ ! 267: /* actually longer */ ! 268: }; ! 269: ! 270: /* ! 271: * Filesystem identification ! 272: */ ! 273: #define FS_MAGIC 0x011954 /* the fast filesystem magic number */ ! 274: #define FS_OKAY 0x7c269d38 /* superblock checksum */ ! 275: #define FS_42INODEFMT -1 /* 4.2BSD inode format */ ! 276: #define FS_44INODEFMT 2 /* 4.4BSD inode format */ ! 277: /* ! 278: * Preference for optimization. ! 279: */ ! 280: #define FS_OPTTIME 0 /* minimize allocation time */ ! 281: #define FS_OPTSPACE 1 /* minimize disk fragmentation */ ! 282: ! 283: /* ! 284: * Rotational layout table format types ! 285: */ ! 286: #define FS_42POSTBLFMT -1 /* 4.2BSD rotational table format */ ! 287: #define FS_DYNAMICPOSTBLFMT 1 /* dynamic rotational table format */ ! 288: /* ! 289: * Macros for access to superblock array structures ! 290: */ ! 291: #define fs_postbl(fs, cylno) \ ! 292: (((fs)->fs_postblformat == FS_42POSTBLFMT) \ ! 293: ? ((fs)->fs_opostbl[cylno]) \ ! 294: : ((int16_t *)((u_int8_t *)(fs) + \ ! 295: (fs)->fs_postbloff) + (cylno) * (fs)->fs_nrpos)) ! 296: #define fs_rotbl(fs) \ ! 297: (((fs)->fs_postblformat == FS_42POSTBLFMT) \ ! 298: ? ((fs)->fs_space) \ ! 299: : ((u_int8_t *)((u_int8_t *)(fs) + (fs)->fs_rotbloff))) ! 300: ! 301: /* ! 302: * The size of a cylinder group is calculated by CGSIZE. The maximum size ! 303: * is limited by the fact that cylinder groups are at most one block. ! 304: * Its size is derived from the size of the maps maintained in the ! 305: * cylinder group and the (struct cg) size. ! 306: */ ! 307: #define CGSIZE(fs) \ ! 308: /* base cg */ (sizeof(struct cg) + sizeof(int32_t) + \ ! 309: /* blktot size */ (fs)->fs_cpg * sizeof(int32_t) + \ ! 310: /* blks size */ (fs)->fs_cpg * (fs)->fs_nrpos * sizeof(int16_t) + \ ! 311: /* inode map */ howmany((fs)->fs_ipg, NBBY) + \ ! 312: /* block map */ howmany((fs)->fs_cpg * (fs)->fs_spc / NSPF(fs), NBBY) +\ ! 313: /* if present */ ((fs)->fs_contigsumsize <= 0 ? 0 : \ ! 314: /* cluster sum */ (fs)->fs_contigsumsize * sizeof(int32_t) + \ ! 315: /* cluster map */ howmany((fs)->fs_cpg * (fs)->fs_spc / NSPB(fs), NBBY))) ! 316: ! 317: /* ! 318: * Convert cylinder group to base address of its global summary info. ! 319: * ! 320: * N.B. This macro assumes that sizeof(struct csum) is a power of two. ! 321: */ ! 322: #define fs_cs(fs, indx) \ ! 323: fs_csp[(indx) >> (fs)->fs_csshift][(indx) & ~(fs)->fs_csmask] ! 324: ! 325: /* ! 326: * Cylinder group block for a file system. ! 327: */ ! 328: #define CG_MAGIC 0x090255 ! 329: struct cg { ! 330: int32_t cg_firstfield; /* historic cyl groups linked list */ ! 331: int32_t cg_magic; /* magic number */ ! 332: time_t cg_time; /* time last written */ ! 333: int32_t cg_cgx; /* we are the cgx'th cylinder group */ ! 334: int16_t cg_ncyl; /* number of cyl's this cg */ ! 335: int16_t cg_niblk; /* number of inode blocks this cg */ ! 336: int32_t cg_ndblk; /* number of data blocks this cg */ ! 337: struct csum cg_cs; /* cylinder summary information */ ! 338: int32_t cg_rotor; /* position of last used block */ ! 339: int32_t cg_frotor; /* position of last used frag */ ! 340: int32_t cg_irotor; /* position of last used inode */ ! 341: int32_t cg_frsum[MAXFRAG]; /* counts of available frags */ ! 342: int32_t cg_btotoff; /* (int32) block totals per cylinder */ ! 343: int32_t cg_boff; /* (u_int16) free block positions */ ! 344: int32_t cg_iusedoff; /* (u_int8) used inode map */ ! 345: int32_t cg_freeoff; /* (u_int8) free block map */ ! 346: int32_t cg_nextfreeoff; /* (u_int8) next available space */ ! 347: int32_t cg_clustersumoff; /* (u_int32) counts of avail clusters */ ! 348: int32_t cg_clusteroff; /* (u_int8) free cluster map */ ! 349: int32_t cg_nclusterblks; /* number of clusters this cg */ ! 350: int32_t cg_sparecon[13]; /* reserved for future use */ ! 351: u_int8_t cg_space[1]; /* space for cylinder group maps */ ! 352: /* actually longer */ ! 353: }; ! 354: ! 355: /* ! 356: * Macros for access to cylinder group array structures ! 357: */ ! 358: #define cg_blktot(cgp) \ ! 359: (((cgp)->cg_magic != CG_MAGIC) \ ! 360: ? (((struct ocg *)(cgp))->cg_btot) \ ! 361: : ((int32_t *)((u_int8_t *)(cgp) + (cgp)->cg_btotoff))) ! 362: #define cg_blks(fs, cgp, cylno) \ ! 363: (((cgp)->cg_magic != CG_MAGIC) \ ! 364: ? (((struct ocg *)(cgp))->cg_b[cylno]) \ ! 365: : ((int16_t *)((u_int8_t *)(cgp) + \ ! 366: (cgp)->cg_boff) + (cylno) * (fs)->fs_nrpos)) ! 367: #define cg_inosused(cgp) \ ! 368: (((cgp)->cg_magic != CG_MAGIC) \ ! 369: ? (((struct ocg *)(cgp))->cg_iused) \ ! 370: : ((u_int8_t *)((u_int8_t *)(cgp) + (cgp)->cg_iusedoff))) ! 371: #define cg_blksfree(cgp) \ ! 372: (((cgp)->cg_magic != CG_MAGIC) \ ! 373: ? (((struct ocg *)(cgp))->cg_free) \ ! 374: : ((u_int8_t *)((u_int8_t *)(cgp) + (cgp)->cg_freeoff))) ! 375: #define cg_chkmagic(cgp) \ ! 376: ((cgp)->cg_magic == CG_MAGIC || ((struct ocg *)(cgp))->cg_magic == CG_MAGIC) ! 377: #define cg_clustersfree(cgp) \ ! 378: ((u_int8_t *)((u_int8_t *)(cgp) + (cgp)->cg_clusteroff)) ! 379: #define cg_clustersum(cgp) \ ! 380: ((int32_t *)((u_int8_t *)(cgp) + (cgp)->cg_clustersumoff)) ! 381: ! 382: /* ! 383: * The following structure is defined ! 384: * for compatibility with old file systems. ! 385: */ ! 386: struct ocg { ! 387: int32_t cg_firstfield; /* historic linked list of cyl groups */ ! 388: int32_t cg_unused_1; /* used for incore cyl groups */ ! 389: time_t cg_time; /* time last written */ ! 390: int32_t cg_cgx; /* we are the cgx'th cylinder group */ ! 391: int16_t cg_ncyl; /* number of cyl's this cg */ ! 392: int16_t cg_niblk; /* number of inode blocks this cg */ ! 393: int32_t cg_ndblk; /* number of data blocks this cg */ ! 394: struct csum cg_cs; /* cylinder summary information */ ! 395: int32_t cg_rotor; /* position of last used block */ ! 396: int32_t cg_frotor; /* position of last used frag */ ! 397: int32_t cg_irotor; /* position of last used inode */ ! 398: int32_t cg_frsum[8]; /* counts of available frags */ ! 399: int32_t cg_btot[32]; /* block totals per cylinder */ ! 400: int16_t cg_b[32][8]; /* positions of free blocks */ ! 401: u_int8_t cg_iused[256]; /* used inode map */ ! 402: int32_t cg_magic; /* magic number */ ! 403: u_int8_t cg_free[1]; /* free block map */ ! 404: /* actually longer */ ! 405: }; ! 406: ! 407: /* ! 408: * Turn file system block numbers into disk block addresses. ! 409: * This maps file system blocks to device size blocks. ! 410: */ ! 411: #define fsbtodb(fs, b) ((b) << (fs)->fs_fsbtodb) ! 412: #define dbtofsb(fs, b) ((b) >> (fs)->fs_fsbtodb) ! 413: ! 414: /* ! 415: * Cylinder group macros to locate things in cylinder groups. ! 416: * They calc file system addresses of cylinder group data structures. ! 417: */ ! 418: #define cgbase(fs, c) ((ufs_daddr_t)((fs)->fs_fpg * (c))) ! 419: #define cgdmin(fs, c) (cgstart(fs, c) + (fs)->fs_dblkno) /* 1st data */ ! 420: #define cgimin(fs, c) (cgstart(fs, c) + (fs)->fs_iblkno) /* inode blk */ ! 421: #define cgsblock(fs, c) (cgstart(fs, c) + (fs)->fs_sblkno) /* super blk */ ! 422: #define cgtod(fs, c) (cgstart(fs, c) + (fs)->fs_cblkno) /* cg block */ ! 423: #define cgstart(fs, c) \ ! 424: (cgbase(fs, c) + (fs)->fs_cgoffset * ((c) & ~((fs)->fs_cgmask))) ! 425: ! 426: /* ! 427: * Macros for handling inode numbers: ! 428: * inode number to file system block offset. ! 429: * inode number to cylinder group number. ! 430: * inode number to file system block address. ! 431: */ ! 432: #define ino_to_cg(fs, x) ((x) / (fs)->fs_ipg) ! 433: #define ino_to_fsba(fs, x) \ ! 434: ((ufs_daddr_t)(cgimin(fs, ino_to_cg(fs, x)) + \ ! 435: (blkstofrags((fs), (((x) % (fs)->fs_ipg) / INOPB(fs)))))) ! 436: #define ino_to_fsbo(fs, x) ((x) % INOPB(fs)) ! 437: ! 438: /* ! 439: * Give cylinder group number for a file system block. ! 440: * Give cylinder group block number for a file system block. ! 441: */ ! 442: #define dtog(fs, d) ((d) / (fs)->fs_fpg) ! 443: #define dtogd(fs, d) ((d) % (fs)->fs_fpg) ! 444: ! 445: /* ! 446: * Extract the bits for a block from a map. ! 447: * Compute the cylinder and rotational position of a cyl block addr. ! 448: */ ! 449: #define blkmap(fs, map, loc) \ ! 450: (((map)[(loc) / NBBY] >> ((loc) % NBBY)) & (0xff >> (NBBY - (fs)->fs_frag))) ! 451: #define cbtocylno(fs, bno) \ ! 452: ((bno) * NSPF(fs) / (fs)->fs_spc) ! 453: #define cbtorpos(fs, bno) \ ! 454: (((bno) * NSPF(fs) % (fs)->fs_spc / (fs)->fs_nsect * (fs)->fs_trackskew + \ ! 455: (bno) * NSPF(fs) % (fs)->fs_spc % (fs)->fs_nsect * (fs)->fs_interleave) % \ ! 456: (fs)->fs_nsect * (fs)->fs_nrpos / (fs)->fs_npsect) ! 457: ! 458: /* ! 459: * The following macros optimize certain frequently calculated ! 460: * quantities by using shifts and masks in place of divisions ! 461: * modulos and multiplications. ! 462: */ ! 463: #define blkoff(fs, loc) /* calculates (loc % fs->fs_bsize) */ \ ! 464: ((loc) & (fs)->fs_qbmask) ! 465: #define fragoff(fs, loc) /* calculates (loc % fs->fs_fsize) */ \ ! 466: ((loc) & (fs)->fs_qfmask) ! 467: #define lblktosize(fs, blk) /* calculates (blk * fs->fs_bsize) */ \ ! 468: ((blk) << (fs)->fs_bshift) ! 469: #define lblkno(fs, loc) /* calculates (loc / fs->fs_bsize) */ \ ! 470: ((loc) >> (fs)->fs_bshift) ! 471: #define numfrags(fs, loc) /* calculates (loc / fs->fs_fsize) */ \ ! 472: ((loc) >> (fs)->fs_fshift) ! 473: #define blkroundup(fs, size) /* calculates roundup(size, fs->fs_bsize) */ \ ! 474: (((size) + (fs)->fs_qbmask) & (fs)->fs_bmask) ! 475: #define fragroundup(fs, size) /* calculates roundup(size, fs->fs_fsize) */ \ ! 476: (((size) + (fs)->fs_qfmask) & (fs)->fs_fmask) ! 477: #define fragstoblks(fs, frags) /* calculates (frags / fs->fs_frag) */ \ ! 478: ((frags) >> (fs)->fs_fragshift) ! 479: #define blkstofrags(fs, blks) /* calculates (blks * fs->fs_frag) */ \ ! 480: ((blks) << (fs)->fs_fragshift) ! 481: #define fragnum(fs, fsb) /* calculates (fsb % fs->fs_frag) */ \ ! 482: ((fsb) & ((fs)->fs_frag - 1)) ! 483: #define blknum(fs, fsb) /* calculates rounddown(fsb, fs->fs_frag) */ \ ! 484: ((fsb) &~ ((fs)->fs_frag - 1)) ! 485: ! 486: /* ! 487: * Determine the number of available frags given a ! 488: * percentage to hold in reserve. ! 489: */ ! 490: #define freespace(fs, percentreserved) \ ! 491: (blkstofrags((fs), (fs)->fs_cstotal.cs_nbfree) + \ ! 492: (fs)->fs_cstotal.cs_nffree - ((fs)->fs_dsize * (percentreserved) / 100)) ! 493: ! 494: /* ! 495: * Determining the size of a file block in the file system. ! 496: */ ! 497: #define blksize(fs, ip, lbn) \ ! 498: (((lbn) >= NDADDR || (ip)->i_size >= ((lbn) + 1) << (fs)->fs_bshift) \ ! 499: ? (fs)->fs_bsize \ ! 500: : (fragroundup(fs, blkoff(fs, (ip)->i_size)))) ! 501: #define dblksize(fs, dip, lbn) \ ! 502: (((lbn) >= NDADDR || (dip)->di_size >= ((lbn) + 1) << (fs)->fs_bshift) \ ! 503: ? (fs)->fs_bsize \ ! 504: : (fragroundup(fs, blkoff(fs, (dip)->di_size)))) ! 505: ! 506: /* ! 507: * Number of disk sectors per block/fragment; assumes DEV_BSIZE byte ! 508: * sector size. ! 509: */ ! 510: #define NSPB(fs) ((fs)->fs_nspf << (fs)->fs_fragshift) ! 511: #define NSPF(fs) ((fs)->fs_nspf) ! 512: ! 513: /* ! 514: * Number of inodes in a secondary storage block/fragment. ! 515: */ ! 516: #define INOPB(fs) ((fs)->fs_inopb) ! 517: #define INOPF(fs) ((fs)->fs_inopb >> (fs)->fs_fragshift) ! 518: ! 519: /* ! 520: * Number of indirects in a file system block. ! 521: */ ! 522: #define NINDIR(fs) ((fs)->fs_nindir) ! 523: ! 524: /* ! 525: * This macro controls whether the file system format is byte swapped or not. ! 526: * At NeXT, all little endian machines read and write big endian file systems. ! 527: */ ! 528: #define BIG_ENDIAN_FS (__LITTLE_ENDIAN__) ! 529: ! 530: extern int inside[], around[]; ! 531: extern u_char *fragtbl[]; ! 532: ! 533: ! 534: /* ! 535: * UFS Label: ! 536: * The purpose of this label is to name a UFS/FFS filesystem. The label ! 537: * is located at offset 7K (BBSIZE=8K - UFS_LABEL_SIZE=1K = 7K) of the ! 538: * partition. The first 7K is still available for boot blocks. ! 539: */ ! 540: ! 541: #define UFS_LABEL_MAGIC { 'L', 'A', 'B', 'L' } ! 542: #define UFS_LABEL_SIZE 1024 ! 543: #define UFS_LABEL_OFFSET (BBSIZE - UFS_LABEL_SIZE) /* top 1K */ ! 544: #define UFS_LABEL_VERSION 1 ! 545: #define UFS_MAX_LABEL_NAME 512 ! 546: ! 547: struct ufslabel { ! 548: u_int32_t ul_magic; ! 549: u_int16_t ul_checksum; /* checksum over entire label*/ ! 550: u_int32_t ul_version; /* label version */ ! 551: u_int32_t ul_time; /* creation time */ ! 552: u_int16_t ul_namelen; /* filesystem name length */ ! 553: u_char ul_name[UFS_MAX_LABEL_NAME]; /* filesystem name */ ! 554: u_char ul_reserved[32];/* reserved for future use */ ! 555: u_char ul_unused[460]; /* pad out to 1K */ ! 556: }; ! 557: ! 558: #endif /* ! _FFS_FS_H_ */
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