1 /** $MirOS: src/sys/ufs/ffs/fs.h,v 1.7 2010/09/21 21:24:31 tg Exp $ */ 2 /* $OpenBSD: fs.h,v 1.17 2005/03/01 13:30:50 aaron Exp $ */ 3 /* $NetBSD: fs.h,v 1.6 1995/04/12 21:21:02 mycroft Exp $ */ 4 5 /* 6 * Copyright (c) 1982, 1986, 1993 7 * The Regents of the University of California. All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * @(#)fs.h 8.10 (Berkeley) 10/27/94 34 */ 35 36 #ifndef UFS_FFS_FS_H 37 #define UFS_FFS_FS_H 38 39 /* 40 * Each disk drive contains some number of file systems. 41 * A file system consists of a number of cylinder groups. 42 * Each cylinder group has inodes and data. 43 * 44 * A file system is described by its super-block, which in turn 45 * describes the cylinder groups. The super-block is critical 46 * data and is replicated in each cylinder group to protect against 47 * catastrophic loss. This is done at `newfs' time and the critical 48 * super-block data does not change, so the copies need not be 49 * referenced further unless disaster strikes. 50 * 51 * For file system fs, the offsets of the various blocks of interest 52 * are given in the super block as: 53 * [fs->fs_sblkno] Super-block 54 * [fs->fs_cblkno] Cylinder group block 55 * [fs->fs_iblkno] Inode blocks 56 * [fs->fs_dblkno] Data blocks 57 * The beginning of cylinder group cg in fs, is given by 58 * the ``cgbase(fs, cg)'' macro. 59 * 60 * The first boot and super blocks are given in absolute disk addresses. 61 * The byte-offset forms are preferred, as they don't imply a sector size. 62 */ 63 #define BBSIZE 8192 64 #define SBSIZE 8192 65 #define BBOFF ((off_t)(0)) 66 #define SBOFF ((off_t)(BBOFF + BBSIZE)) 67 #define BBLOCK ((daddr_t)(0)) 68 #define SBLOCK ((daddr_t)(BBLOCK + BBSIZE / DEV_BSIZE)) 69 #define SBLOCK_FLOPPY 0 70 #define SBLOCK_UFS1 8192 71 #define SBLOCK_UFS2 65536 72 #define SBLOCK_PIGGY 262144 73 #define SBLOCKSIZE 8192 74 #define SBLOCKSEARCH \ 75 { SBLOCK_UFS2, SBLOCK_UFS1, SBLOCK_FLOPPY, SBLOCK_PIGGY, -1 } 76 77 /* 78 * Addresses stored in inodes are capable of addressing fragments 79 * of `blocks'. File system blocks of at most size MAXBSIZE can 80 * be optionally broken into 2, 4, or 8 pieces, each of which is 81 * addressible; these pieces may be DEV_BSIZE, or some multiple of 82 * a DEV_BSIZE unit. 83 * 84 * Large files consist of exclusively large data blocks. To avoid 85 * undue wasted disk space, the last data block of a small file may be 86 * allocated as only as many fragments of a large block as are 87 * necessary. The file system format retains only a single pointer 88 * to such a fragment, which is a piece of a single large block that 89 * has been divided. The size of such a fragment is determinable from 90 * information in the inode, using the ``blksize(fs, ip, lbn)'' macro. 91 * 92 * The file system records space availability at the fragment level; 93 * to determine block availability, aligned fragments are examined. 94 */ 95 96 /* 97 * MINBSIZE is the smallest allowable block size. 98 * In order to insure that it is possible to create files of size 99 * 2^32 with only two levels of indirection, MINBSIZE is set to 4096. 100 * MINBSIZE must be big enough to hold a cylinder group block, 101 * thus changes to (struct cg) must keep its size within MINBSIZE. 102 * Note that super blocks are always of size SBSIZE, 103 * and that both SBSIZE and MAXBSIZE must be >= MINBSIZE. 104 */ 105 #define MINBSIZE 4096 106 107 /* 108 * The path name on which the file system is mounted is maintained 109 * in fs_fsmnt. MAXMNTLEN defines the amount of space allocated in 110 * the super block for this name. 111 */ 112 #define MAXMNTLEN 512 113 114 /* 115 * There is a 128-byte region in the superblock reserved for in-core 116 * pointers to summary information. Originally this included an array 117 * of pointers to blocks of struct csum; now there are just three 118 * pointers and the remaining space is padded with fs_ocsp[]. 119 * 120 * NOCSPTRS determines the size of this padding. One pointer (fs_csp) 121 * is taken away to point to a contiguous array of struct csum for 122 * all cylinder groups; a second (fs_maxcluster) points to an array 123 * of cluster sizes that is computed as cylinder groups are inspected, 124 * and the third points to an array that tracks the creation of new 125 * directories. 126 */ 127 #define NOCSPTRS ((128 / sizeof(void *)) - 3) 128 129 /* 130 * A summary of contiguous blocks of various sizes is maintained 131 * in each cylinder group. Normally this is set by the initial 132 * value of fs_maxcontig. To conserve space, a maximum summary size 133 * is set by FS_MAXCONTIG. 134 */ 135 #define FS_MAXCONTIG 16 136 137 /* 138 * MINFREE gives the minimum acceptable percentage of file system 139 * blocks which may be free. If the freelist drops below this level 140 * only the superuser may continue to allocate blocks. This may 141 * be set to 0 if no reserve of free blocks is deemed necessary, 142 * however throughput drops by fifty percent if the file system 143 * is run at between 95% and 100% full; thus the minimum default 144 * value of fs_minfree is 5%. However, to get good clustering 145 * performance, 10% is a better choice. hence we use 10% as our 146 * default value. With 10% free space, fragmentation is not a 147 * problem, so we choose to optimize for time. 148 */ 149 #define MINFREE 5 150 #define DEFAULTOPT FS_OPTTIME 151 152 /* 153 * The directory preference algorithm(dirpref) can be tuned by adjusting 154 * the following parameters which tell the system the average file size 155 * and the average number of files per directory. These defaults are well 156 * selected for typical filesystems, but may need to be tuned for odd 157 * cases like filesystems being used for sqiud caches or news spools. 158 */ 159 #define AVFILESIZ 16384 /* expected average file size */ 160 #define AFPDIR 64 /* expected number of files per directory */ 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 struct csum { 169 int32_t cs_ndir; /* number of directories */ 170 int32_t cs_nbfree; /* number of free blocks */ 171 int32_t cs_nifree; /* number of free inodes */ 172 int32_t cs_nffree; /* number of free frags */ 173 }; 174 175 /* 176 * Super block for an FFS file system. 177 */ 178 struct fs { 179 int32_t fs_historic_start[2]; /* used by MirBSD to store entropy */ 180 #define fs_firstfield fs_historic_start[0] /* file system linked list, */ 181 #define fs_unused_1 fs_historic_start[1] /* used for incore superblk */ 182 int32_t fs_sblkno; /* addr of super-block in filesys */ 183 int32_t fs_cblkno; /* offset of cyl-block in filesys */ 184 int32_t fs_iblkno; /* offset of inode-blocks in filesys */ 185 int32_t fs_dblkno; /* offset of first data after cg */ 186 int32_t fs_cgoffset; /* cylinder group offset in cylinder */ 187 int32_t fs_cgmask; /* used to calc mod fs_ntrak */ 188 int32_t fs_time; /* last time written XXX was time_t */ 189 int32_t fs_size; /* number of blocks in fs */ 190 int32_t fs_dsize; /* number of data blocks in fs */ 191 int32_t fs_ncg; /* number of cylinder groups */ 192 int32_t fs_bsize; /* size of basic blocks in fs */ 193 int32_t fs_fsize; /* size of frag blocks in fs */ 194 int32_t fs_frag; /* number of frags in a block in fs */ 195 /* these are configuration parameters */ 196 int32_t fs_minfree; /* minimum percentage of free blocks */ 197 int32_t fs_rotdelay; /* num of ms for optimal next block */ 198 int32_t fs_rps; /* disk revolutions per second */ 199 /* these fields can be computed from the others */ 200 int32_t fs_bmask; /* ``blkoff'' calc of blk offsets */ 201 int32_t fs_fmask; /* ``fragoff'' calc of frag offsets */ 202 int32_t fs_bshift; /* ``lblkno'' calc of logical blkno */ 203 int32_t fs_fshift; /* ``numfrags'' calc number of frags */ 204 /* these are configuration parameters */ 205 int32_t fs_maxcontig; /* max number of contiguous blks */ 206 int32_t fs_maxbpg; /* max number of blks per cyl group */ 207 /* these fields can be computed from the others */ 208 int32_t fs_fragshift; /* block to frag shift */ 209 int32_t fs_fsbtodb; /* fsbtodb and dbtofsb shift constant */ 210 int32_t fs_sbsize; /* actual size of super block */ 211 int32_t fs_csmask; /* csum block offset (now unused) */ 212 int32_t fs_csshift; /* csum block number (now unused) */ 213 int32_t fs_nindir; /* value of NINDIR */ 214 int32_t fs_inopb; /* value of INOPB */ 215 int32_t fs_nspf; /* value of NSPF */ 216 /* yet another configuration parameter */ 217 int32_t fs_optim; /* optimization preference, see below */ 218 /* these fields are derived from the hardware */ 219 int32_t fs_npsect; /* # sectors/track including spares */ 220 int32_t fs_interleave; /* hardware sector interleave */ 221 int32_t fs_trackskew; /* sector 0 skew, per track */ 222 /* fs_id takes the space of the unused fs_headswitch and fs_trkseek fields */ 223 int32_t fs_id[2]; /* unique filesystem id */ 224 /* sizes determined by number of cylinder groups and their sizes */ 225 int32_t fs_csaddr; /* blk addr of cyl grp summary area */ 226 int32_t fs_cssize; /* size of cyl grp summary area */ 227 int32_t fs_cgsize; /* cylinder group size */ 228 /* these fields are derived from the hardware */ 229 int32_t fs_ntrak; /* tracks per cylinder */ 230 int32_t fs_nsect; /* sectors per track */ 231 int32_t fs_spc; /* sectors per cylinder */ 232 /* this comes from the disk driver partitioning */ 233 int32_t fs_ncyl; /* cylinders in file system */ 234 /* these fields can be computed from the others */ 235 int32_t fs_cpg; /* cylinders per group */ 236 int32_t fs_ipg; /* inodes per group */ 237 int32_t fs_fpg; /* blocks per group * fs_frag */ 238 /* this data must be re-computed after crashes */ 239 struct csum fs_cstotal; /* cylinder summary information */ 240 /* these fields are cleared at mount time */ 241 int8_t fs_fmod; /* super block modified flag */ 242 int8_t fs_clean; /* file system is clean flag */ 243 int8_t fs_ronly; /* mounted read-only flag */ 244 int8_t fs_flags; /* see FS_ below */ 245 u_char fs_fsmnt[MAXMNTLEN]; /* name mounted on */ 246 /* these fields retain the current block allocation info */ 247 int32_t fs_cgrotor; /* last cg searched */ 248 void *fs_ocsp[NOCSPTRS]; /* padding; was list of fs_cs buffers */ 249 u_int8_t *fs_contigdirs; /* # of contiguously allocated dirs */ 250 struct csum *fs_csp; /* cg summary info buffer for fs_cs */ 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_snapinum[20]; /* reserved for snapshot inode nums */ 255 int32_t fs_avgfilesize; /* expected average file size */ 256 int32_t fs_avgfpdir; /* expected # of files per directory */ 257 int32_t fs_sparecon[27]; /* reserved for future constants */ 258 int32_t fs_fscktime; /* last time fsck(8)ed XXX was time_t */ 259 int32_t fs_contigsumsize; /* size of cluster summary array */ 260 int32_t fs_maxsymlinklen; /* max length of an internal symlink */ 261 int32_t fs_inodefmt; /* format of on-disk inodes */ 262 u_int64_t fs_maxfilesize; /* maximum representable file size */ 263 int64_t fs_qbmask; /* ~fs_bmask - for use with quad size */ 264 int64_t fs_qfmask; /* ~fs_fmask - for use with quad size */ 265 int32_t fs_state; /* validate fs_clean field */ 266 int32_t fs_postblformat; /* format of positional layout tables */ 267 int32_t fs_nrpos; /* number of rotational positions */ 268 int32_t fs_postbloff; /* (u_int16) rotation block list head */ 269 int32_t fs_rotbloff; /* (u_int8) blocks for each rotation */ 270 int32_t fs_magic; /* magic number */ 271 u_int8_t fs_space[1]; /* list of blocks for each rotation */ 272 /* actually longer */ 273 }; 274 275 #define fs_opostbl_start fs_opostbl[0][0] 276 277 /* 278 * Filesystem identification 279 */ 280 #define FS_MAGIC 0x011954 /* the fast filesystem magic number */ 281 #define FS_UFS1_MAGIC 0x011954 /* the fast filesystem magic number */ 282 #define FS_UFS2_MAGIC 0x19540119 /* UFS fast filesystem magic number */ 283 #define FS_OKAY 0x7c269d38 /* superblock checksum */ 284 #define FS_42INODEFMT -1 /* 4.2BSD inode format */ 285 #define FS_44INODEFMT 2 /* 4.4BSD inode format */ 286 287 /* 288 * Filesystem clean flags 289 */ 290 #define FS_ISCLEAN 0x01 291 #define FS_WASCLEAN 0x02 292 293 /* 294 * Preference for optimization. 295 */ 296 #define FS_OPTTIME 0 /* minimize allocation time */ 297 #define FS_OPTSPACE 1 /* minimize disk fragmentation */ 298 299 /* 300 * Filesystem flags. 301 */ 302 #define FS_UNCLEAN 0x01 /* filesystem not clean at mount */ 303 #define FS_DOSOFTDEP 0x02 /* filesystem using soft dependencies */ 304 305 /* 306 * Rotational layout table format types 307 */ 308 #define FS_42POSTBLFMT -1 /* 4.2BSD rotational table format */ 309 #define FS_DYNAMICPOSTBLFMT 1 /* dynamic rotational table format */ 310 /* 311 * Macros for access to superblock array structures 312 */ 313 #define fs_postbl(fs, cylno) \ 314 (((fs)->fs_postblformat == FS_42POSTBLFMT) \ 315 ? ((fs)->fs_opostbl[cylno]) \ 316 : ((int16_t *)((u_int8_t *)(fs) + \ 317 (fs)->fs_postbloff) + (cylno) * (fs)->fs_nrpos)) 318 #define fs_rotbl(fs) \ 319 (((fs)->fs_postblformat == FS_42POSTBLFMT) \ 320 ? ((fs)->fs_space) \ 321 : ((u_int8_t *)((u_int8_t *)(fs) + (fs)->fs_rotbloff))) 322 323 /* 324 * The size of a cylinder group is calculated by CGSIZE. The maximum size 325 * is limited by the fact that cylinder groups are at most one block. 326 * Its size is derived from the size of the maps maintained in the 327 * cylinder group and the (struct cg) size. 328 */ 329 #define CGSIZE(fs) \ 330 /* base cg */ (sizeof(struct cg) + sizeof(int32_t) + \ 331 /* blktot size */ (fs)->fs_cpg * sizeof(int32_t) + \ 332 /* blks size */ (fs)->fs_cpg * (fs)->fs_nrpos * sizeof(int16_t) + \ 333 /* inode map */ howmany((fs)->fs_ipg, NBBY) + \ 334 /* block map */ howmany((fs)->fs_cpg * (fs)->fs_spc / NSPF(fs), NBBY) +\ 335 /* if present */ ((fs)->fs_contigsumsize <= 0 ? 0 : \ 336 /* cluster sum */ (fs)->fs_contigsumsize * sizeof(int32_t) + \ 337 /* cluster map */ howmany((fs)->fs_cpg * (fs)->fs_spc / NSPB(fs), NBBY))) 338 339 /* 340 * Convert cylinder group to base address of its global summary info. 341 */ 342 #define fs_cs(fs, indx) fs_csp[indx] 343 344 /* 345 * Cylinder group block for a file system. 346 */ 347 #define CG_MAGIC 0x090255 348 struct cg { 349 int32_t cg_firstfield; /* historic cyl groups linked list */ 350 int32_t cg_magic; /* magic number */ 351 int32_t cg_time; /* time last written XXX was time_t */ 352 int32_t cg_cgx; /* we are the cgx'th cylinder group */ 353 int16_t cg_ncyl; /* number of cyl's this cg */ 354 int16_t cg_niblk; /* number of inode blocks this cg */ 355 int32_t cg_ndblk; /* number of data blocks this cg */ 356 struct csum cg_cs; /* cylinder summary information */ 357 int32_t cg_rotor; /* position of last used block */ 358 int32_t cg_frotor; /* position of last used frag */ 359 int32_t cg_irotor; /* position of last used inode */ 360 int32_t cg_frsum[MAXFRAG]; /* counts of available frags */ 361 int32_t cg_btotoff; /* (int32) block totals per cylinder */ 362 int32_t cg_boff; /* (u_int16) free block positions */ 363 int32_t cg_iusedoff; /* (u_int8) used inode map */ 364 int32_t cg_freeoff; /* (u_int8) free block map */ 365 int32_t cg_nextfreeoff; /* (u_int8) next available space */ 366 int32_t cg_clustersumoff; /* (u_int32) counts of avail clusters */ 367 int32_t cg_clusteroff; /* (u_int8) free cluster map */ 368 int32_t cg_nclusterblks; /* number of clusters this cg */ 369 int32_t cg_ffs2_niblk; /* number of inode blocks this cg */ 370 int32_t cg_initediblk; /* last initialized inode */ 371 int32_t cg_sparecon32[3]; /* reserved for future use */ 372 int64_t cg_ffs2_time; /* time last written */ 373 int64_t cg_sparecon64[3]; /* reserved for future use */ 374 u_int8_t cg_space[1]; /* space for cylinder group maps */ 375 /* actually longer */ 376 }; 377 378 /* 379 * Macros for access to cylinder group array structures 380 */ 381 #define cg_blktot(cgp) \ 382 (((cgp)->cg_magic != CG_MAGIC) \ 383 ? (((struct ocg *)(cgp))->cg_btot) \ 384 : ((int32_t *)((u_int8_t *)(cgp) + (cgp)->cg_btotoff))) 385 #define cg_blks(fs, cgp, cylno) \ 386 (((cgp)->cg_magic != CG_MAGIC) \ 387 ? (((struct ocg *)(cgp))->cg_b[cylno]) \ 388 : ((int16_t *)((u_int8_t *)(cgp) + \ 389 (cgp)->cg_boff) + (cylno) * (fs)->fs_nrpos)) 390 #define cg_inosused(cgp) \ 391 (((cgp)->cg_magic != CG_MAGIC) \ 392 ? (((struct ocg *)(cgp))->cg_iused) \ 393 : ((u_int8_t *)((u_int8_t *)(cgp) + (cgp)->cg_iusedoff))) 394 #define cg_blksfree(cgp) \ 395 (((cgp)->cg_magic != CG_MAGIC) \ 396 ? (((struct ocg *)(cgp))->cg_free) \ 397 : ((u_int8_t *)((u_int8_t *)(cgp) + (cgp)->cg_freeoff))) 398 #define cg_chkmagic(cgp) \ 399 ((cgp)->cg_magic == CG_MAGIC || ((struct ocg *)(cgp))->cg_magic == CG_MAGIC) 400 #define cg_clustersfree(cgp) \ 401 ((u_int8_t *)((u_int8_t *)(cgp) + (cgp)->cg_clusteroff)) 402 #define cg_clustersum(cgp) \ 403 ((int32_t *)((u_int8_t *)(cgp) + (cgp)->cg_clustersumoff)) 404 405 /* 406 * The following structure is defined 407 * for compatibility with old file systems. 408 */ 409 struct ocg { 410 int32_t cg_firstfield; /* historic linked list of cyl groups */ 411 int32_t cg_unused_1; /* used for incore cyl groups */ 412 int32_t cg_time; /* time last written XXX was time_t */ 413 int32_t cg_cgx; /* we are the cgx'th cylinder group */ 414 int16_t cg_ncyl; /* number of cyl's this cg */ 415 int16_t cg_niblk; /* number of inode blocks this cg */ 416 int32_t cg_ndblk; /* number of data blocks this cg */ 417 struct csum cg_cs; /* cylinder summary information */ 418 int32_t cg_rotor; /* position of last used block */ 419 int32_t cg_frotor; /* position of last used frag */ 420 int32_t cg_irotor; /* position of last used inode */ 421 int32_t cg_frsum[8]; /* counts of available frags */ 422 int32_t cg_btot[32]; /* block totals per cylinder */ 423 int16_t cg_b[32][8]; /* positions of free blocks */ 424 u_int8_t cg_iused[256]; /* used inode map */ 425 int32_t cg_magic; /* magic number */ 426 u_int8_t cg_free[1]; /* free block map */ 427 /* actually longer */ 428 }; 429 430 /* 431 * Turn file system block numbers into disk block addresses. 432 * This maps file system blocks to device size blocks. 433 */ 434 #define fsbtodb(fs, b) ((b) << (fs)->fs_fsbtodb) 435 #define dbtofsb(fs, b) ((b) >> (fs)->fs_fsbtodb) 436 437 /* 438 * Cylinder group macros to locate things in cylinder groups. 439 * They calc file system addresses of cylinder group data structures. 440 */ 441 #define cgbase(fs, c) ((daddr_t)((fs)->fs_fpg * (c))) 442 #define cgdmin(fs, c) (cgstart(fs, c) + (fs)->fs_dblkno) /* 1st data */ 443 #define cgimin(fs, c) (cgstart(fs, c) + (fs)->fs_iblkno) /* inode blk */ 444 #define cgsblock(fs, c) (cgstart(fs, c) + (fs)->fs_sblkno) /* super blk */ 445 #define cgtod(fs, c) (cgstart(fs, c) + (fs)->fs_cblkno) /* cg block */ 446 #define cgstart(fs, c) \ 447 (cgbase(fs, c) + (fs)->fs_cgoffset * ((c) & ~((fs)->fs_cgmask))) 448 449 /* 450 * Macros for handling inode numbers: 451 * inode number to file system block offset. 452 * inode number to cylinder group number. 453 * inode number to file system block address. 454 */ 455 #define ino_to_cg(fs, x) ((x) / (fs)->fs_ipg) 456 #define ino_to_fsba(fs, x) \ 457 ((daddr_t)(cgimin(fs, ino_to_cg(fs, x)) + \ 458 (blkstofrags((fs), (((x) % (fs)->fs_ipg) / INOPB(fs)))))) 459 #define ino_to_fsbo(fs, x) ((x) % INOPB(fs)) 460 461 /* 462 * Give cylinder group number for a file system block. 463 * Give cylinder group block number for a file system block. 464 */ 465 #define dtog(fs, d) ((d) / (fs)->fs_fpg) 466 #define dtogd(fs, d) ((d) % (fs)->fs_fpg) 467 468 /* 469 * Extract the bits for a block from a map. 470 * Compute the cylinder and rotational position of a cyl block addr. 471 */ 472 #define blkmap(fs, map, loc) \ 473 (((map)[(loc) / NBBY] >> ((loc) % NBBY)) & (0xff >> (NBBY - (fs)->fs_frag))) 474 #define cbtocylno(fs, bno) \ 475 ((bno) * NSPF(fs) / (fs)->fs_spc) 476 #define cbtorpos(fs, bno) \ 477 (((bno) * NSPF(fs) % (fs)->fs_spc / (fs)->fs_nsect * (fs)->fs_trackskew + \ 478 (bno) * NSPF(fs) % (fs)->fs_spc % (fs)->fs_nsect * (fs)->fs_interleave) % \ 479 (fs)->fs_nsect * (fs)->fs_nrpos / (fs)->fs_npsect) 480 481 /* 482 * The following macros optimize certain frequently calculated 483 * quantities by using shifts and masks in place of divisions 484 * modulos and multiplications. 485 */ 486 #define blkoff(fs, loc) /* calculates (loc % fs->fs_bsize) */ \ 487 ((loc) & (fs)->fs_qbmask) 488 #define fragoff(fs, loc) /* calculates (loc % fs->fs_fsize) */ \ 489 ((loc) & (fs)->fs_qfmask) 490 #define lblktosize(fs, blk) /* calculates ((off_t)blk * fs->fs_bsize) */ \ 491 ((off_t)(blk) << (fs)->fs_bshift) 492 #define lblkno(fs, loc) /* calculates (loc / fs->fs_bsize) */ \ 493 ((loc) >> (fs)->fs_bshift) 494 #define numfrags(fs, loc) /* calculates (loc / fs->fs_fsize) */ \ 495 ((loc) >> (fs)->fs_fshift) 496 #define blkroundup(fs, size) /* calculates roundup(size, fs->fs_bsize) */ \ 497 (((size) + (fs)->fs_qbmask) & (fs)->fs_bmask) 498 #define fragroundup(fs, size) /* calculates roundup(size, fs->fs_fsize) */ \ 499 (((size) + (fs)->fs_qfmask) & (fs)->fs_fmask) 500 #define fragstoblks(fs, frags) /* calculates (frags / fs->fs_frag) */ \ 501 ((frags) >> (fs)->fs_fragshift) 502 #define blkstofrags(fs, blks) /* calculates (blks * fs->fs_frag) */ \ 503 ((blks) << (fs)->fs_fragshift) 504 #define fragnum(fs, fsb) /* calculates (fsb % fs->fs_frag) */ \ 505 ((fsb) & ((fs)->fs_frag - 1)) 506 #define blknum(fs, fsb) /* calculates rounddown(fsb, fs->fs_frag) */ \ 507 ((fsb) &~ ((fs)->fs_frag - 1)) 508 509 /* 510 * Determine the number of available frags given a 511 * percentage to hold in reserve. 512 */ 513 #define freespace(fs, percentreserved) \ 514 (blkstofrags((fs), (fs)->fs_cstotal.cs_nbfree) + \ 515 (fs)->fs_cstotal.cs_nffree - ((fs)->fs_dsize * (percentreserved) / 100)) 516 517 /* 518 * Determining the size of a file block in the file system. 519 */ 520 #define blksize(fs, ip, lbn) \ 521 (((lbn) >= NDADDR || (ip)->i_ffs_size >= ((lbn) + 1) << (fs)->fs_bshift) \ 522 ? (fs)->fs_bsize \ 523 : (fragroundup(fs, blkoff(fs, (ip)->i_ffs_size)))) 524 #define dblksize(fs, dip, lbn) \ 525 (((lbn) >= NDADDR || (dip)->di_size >= ((lbn) + 1) << (fs)->fs_bshift) \ 526 ? (fs)->fs_bsize \ 527 : (fragroundup(fs, blkoff(fs, (dip)->di_size)))) 528 529 #define sblksize(fs, size, lbn) \ 530 (((lbn) >= NDADDR || (size) >= ((lbn) + 1) << (fs)->fs_bshift) \ 531 ? (fs)->fs_bsize \ 532 : (fragroundup(fs, blkoff(fs, (size))))) 533 534 535 /* 536 * Number of disk sectors per block/fragment; assumes DEV_BSIZE byte 537 * sector size. 538 */ 539 #define NSPB(fs) ((fs)->fs_nspf << (fs)->fs_fragshift) 540 #define NSPF(fs) ((fs)->fs_nspf) 541 542 /* 543 * Number of inodes in a secondary storage block/fragment. 544 */ 545 #define INOPB(fs) ((fs)->fs_inopb) 546 #define INOPF(fs) ((fs)->fs_inopb >> (fs)->fs_fragshift) 547 548 /* 549 * Number of indirects in a file system block. 550 */ 551 #define NINDIR(fs) ((fs)->fs_nindir) 552 553 extern const int inside[], around[]; 554 extern const u_char *fragtbl[]; 555 556 #endif /* notdef UFS_FFS_FS_H */ 557