| 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, with or without |
| 6 | * modification, are permitted provided that the following conditions |
| 7 | * are met: |
| 8 | * 1. Redistributions of source code must retain the above copyright |
| 9 | * notice, this list of conditions and the following disclaimer. |
| 10 | * 2. Redistributions in binary form must reproduce the above copyright |
| 11 | * notice, this list of conditions and the following disclaimer in the |
| 12 | * documentation and/or other materials provided with the distribution. |
| 13 | * 3. All advertising materials mentioning features or use of this software |
| 14 | * must display the following acknowledgement: |
| 15 | * This product includes software developed by the University of |
| 16 | * California, Berkeley and its contributors. |
| 17 | * 4. 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 7.12 (Berkeley) 5/8/91 |
| 34 | */ |
| 35 | |
| 36 | /* |
| 37 | * Each disk drive contains some number of file systems. |
| 38 | * A file system consists of a number of cylinder groups. |
| 39 | * Each cylinder group has inodes and data. |
| 40 | * |
| 41 | * A file system is described by its super-block, which in turn |
| 42 | * describes the cylinder groups. The super-block is critical |
| 43 | * data and is replicated in each cylinder group to protect against |
| 44 | * catastrophic loss. This is done at `newfs' time and the critical |
| 45 | * super-block data does not change, so the copies need not be |
| 46 | * referenced further unless disaster strikes. |
| 47 | * |
| 48 | * For file system fs, the offsets of the various blocks of interest |
| 49 | * are given in the super block as: |
| 50 | * [fs->fs_sblkno] Super-block |
| 51 | * [fs->fs_cblkno] Cylinder group block |
| 52 | * [fs->fs_iblkno] Inode blocks |
| 53 | * [fs->fs_dblkno] Data blocks |
| 54 | * The beginning of cylinder group cg in fs, is given by |
| 55 | * the ``cgbase(fs, cg)'' macro. |
| 56 | * |
| 57 | * The first boot and super blocks are given in absolute disk addresses. |
| 58 | * The byte-offset forms are preferred, as they don't imply a sector size. |
| 59 | */ |
| 60 | #define BBSIZE 8192 |
| 61 | #define SBSIZE 8192 |
| 62 | #define BBOFF ((off_t)(0)) |
| 63 | #define SBOFF ((off_t)(BBOFF + BBSIZE)) |
| 64 | #define BBLOCK ((daddr_t)(0)) |
| 65 | #define SBLOCK ((daddr_t)(BBLOCK + BBSIZE / DEV_BSIZE)) |
| 66 | |
| 67 | /* |
| 68 | * Addresses stored in inodes are capable of addressing fragments |
| 69 | * of `blocks'. File system blocks of at most size MAXBSIZE can |
| 70 | * be optionally broken into 2, 4, or 8 pieces, each of which is |
| 71 | * addressible; these pieces may be DEV_BSIZE, or some multiple of |
| 72 | * a DEV_BSIZE unit. |
| 73 | * |
| 74 | * Large files consist of exclusively large data blocks. To avoid |
| 75 | * undue wasted disk space, the last data block of a small file may be |
| 76 | * allocated as only as many fragments of a large block as are |
| 77 | * necessary. The file system format retains only a single pointer |
| 78 | * to such a fragment, which is a piece of a single large block that |
| 79 | * has been divided. The size of such a fragment is determinable from |
| 80 | * information in the inode, using the ``blksize(fs, ip, lbn)'' macro. |
| 81 | * |
| 82 | * The file system records space availability at the fragment level; |
| 83 | * to determine block availability, aligned fragments are examined. |
| 84 | * |
| 85 | * The root inode is the root of the file system. |
| 86 | * Inode 0 can't be used for normal purposes and |
| 87 | * historically bad blocks were linked to inode 1, |
| 88 | * thus the root inode is 2. (inode 1 is no longer used for |
| 89 | * this purpose, however numerous dump tapes make this |
| 90 | * assumption, so we are stuck with it) |
| 91 | */ |
| 92 | #define ROOTINO ((ino_t)2) |
| 93 | |
| 94 | /* |
| 95 | * MINBSIZE is the smallest allowable block size. |
| 96 | * In order to insure that it is possible to create files of size |
| 97 | * 2^32 with only two levels of indirection, MINBSIZE is set to 4096. |
| 98 | * MINBSIZE must be big enough to hold a cylinder group block, |
| 99 | * thus changes to (struct cg) must keep its size within MINBSIZE. |
| 100 | * Note that super blocks are always of size SBSIZE, |
| 101 | * and that both SBSIZE and MAXBSIZE must be >= MINBSIZE. |
| 102 | */ |
| 103 | #define MINBSIZE 4096 |
| 104 | |
| 105 | /* |
| 106 | * The path name on which the file system is mounted is maintained |
| 107 | * in fs_fsmnt. MAXMNTLEN defines the amount of space allocated in |
| 108 | * the super block for this name. |
| 109 | * The limit on the amount of summary information per file system |
| 110 | * is defined by MAXCSBUFS. It is currently parameterized for a |
| 111 | * maximum of two million cylinders. |
| 112 | */ |
| 113 | #define MAXMNTLEN 512 |
| 114 | #define MAXCSBUFS 32 |
| 115 | |
| 116 | /* |
| 117 | * Per cylinder group information; summarized in blocks allocated |
| 118 | * from first cylinder group data blocks. These blocks have to be |
| 119 | * read in from fs_csaddr (size fs_cssize) in addition to the |
| 120 | * super block. |
| 121 | * |
| 122 | * N.B. sizeof(struct csum) must be a power of two in order for |
| 123 | * the ``fs_cs'' macro to work (see below). |
| 124 | */ |
| 125 | struct csum { |
| 126 | long cs_ndir; /* number of directories */ |
| 127 | long cs_nbfree; /* number of free blocks */ |
| 128 | long cs_nifree; /* number of free inodes */ |
| 129 | long cs_nffree; /* number of free frags */ |
| 130 | }; |
| 131 | |
| 132 | /* |
| 133 | * Super block for a file system. |
| 134 | */ |
| 135 | #define FS_MAGIC 0x011954 |
| 136 | #define FSOKAY 0x7c269d38 |
| 137 | struct fs |
| 138 | { |
| 139 | struct fs *fs_link; /* linked list of file systems */ |
| 140 | struct fs *fs_rlink; /* used for incore super blocks */ |
| 141 | daddr_t fs_sblkno; /* addr of super-block in filesys */ |
| 142 | daddr_t fs_cblkno; /* offset of cyl-block in filesys */ |
| 143 | daddr_t fs_iblkno; /* offset of inode-blocks in filesys */ |
| 144 | daddr_t fs_dblkno; /* offset of first data after cg */ |
| 145 | long fs_cgoffset; /* cylinder group offset in cylinder */ |
| 146 | long fs_cgmask; /* used to calc mod fs_ntrak */ |
| 147 | time_t fs_time; /* last time written */ |
| 148 | long fs_size; /* number of blocks in fs */ |
| 149 | long fs_dsize; /* number of data blocks in fs */ |
| 150 | long fs_ncg; /* number of cylinder groups */ |
| 151 | long fs_bsize; /* size of basic blocks in fs */ |
| 152 | long fs_fsize; /* size of frag blocks in fs */ |
| 153 | long fs_frag; /* number of frags in a block in fs */ |
| 154 | /* these are configuration parameters */ |
| 155 | long fs_minfree; /* minimum percentage of free blocks */ |
| 156 | long fs_rotdelay; /* num of ms for optimal next block */ |
| 157 | long fs_rps; /* disk revolutions per second */ |
| 158 | /* these fields can be computed from the others */ |
| 159 | long fs_bmask; /* ``blkoff'' calc of blk offsets */ |
| 160 | long fs_fmask; /* ``fragoff'' calc of frag offsets */ |
| 161 | long fs_bshift; /* ``lblkno'' calc of logical blkno */ |
| 162 | long fs_fshift; /* ``numfrags'' calc number of frags */ |
| 163 | /* these are configuration parameters */ |
| 164 | long fs_maxcontig; /* max number of contiguous blks */ |
| 165 | long fs_maxbpg; /* max number of blks per cyl group */ |
| 166 | /* these fields can be computed from the others */ |
| 167 | long fs_fragshift; /* block to frag shift */ |
| 168 | long fs_fsbtodb; /* fsbtodb and dbtofsb shift constant */ |
| 169 | long fs_sbsize; /* actual size of super block */ |
| 170 | long fs_csmask; /* csum block offset */ |
| 171 | long fs_csshift; /* csum block number */ |
| 172 | long fs_nindir; /* value of NINDIR */ |
| 173 | long fs_inopb; /* value of INOPB */ |
| 174 | long fs_nspf; /* value of NSPF */ |
| 175 | /* yet another configuration parameter */ |
| 176 | long fs_optim; /* optimization preference, see below */ |
| 177 | /* these fields are derived from the hardware */ |
| 178 | long fs_npsect; /* # sectors/track including spares */ |
| 179 | long fs_interleave; /* hardware sector interleave */ |
| 180 | long fs_trackskew; /* sector 0 skew, per track */ |
| 181 | long fs_headswitch; /* head switch time, usec */ |
| 182 | long fs_trkseek; /* track-to-track seek, usec */ |
| 183 | /* sizes determined by number of cylinder groups and their sizes */ |
| 184 | daddr_t fs_csaddr; /* blk addr of cyl grp summary area */ |
| 185 | long fs_cssize; /* size of cyl grp summary area */ |
| 186 | long fs_cgsize; /* cylinder group size */ |
| 187 | /* these fields are derived from the hardware */ |
| 188 | long fs_ntrak; /* tracks per cylinder */ |
| 189 | long fs_nsect; /* sectors per track */ |
| 190 | long fs_spc; /* sectors per cylinder */ |
| 191 | /* this comes from the disk driver partitioning */ |
| 192 | long fs_ncyl; /* cylinders in file system */ |
| 193 | /* these fields can be computed from the others */ |
| 194 | long fs_cpg; /* cylinders per group */ |
| 195 | long fs_ipg; /* inodes per group */ |
| 196 | long fs_fpg; /* blocks per group * fs_frag */ |
| 197 | /* this data must be re-computed after crashes */ |
| 198 | struct csum fs_cstotal; /* cylinder summary information */ |
| 199 | /* these fields are cleared at mount time */ |
| 200 | char fs_fmod; /* super block modified flag */ |
| 201 | char fs_clean; /* file system is clean flag */ |
| 202 | char fs_ronly; /* mounted read-only flag */ |
| 203 | char fs_flags; /* currently unused flag */ |
| 204 | char fs_fsmnt[MAXMNTLEN]; /* name mounted on */ |
| 205 | /* these fields retain the current block allocation info */ |
| 206 | long fs_cgrotor; /* last cg searched */ |
| 207 | struct csum *fs_csp[MAXCSBUFS];/* list of fs_cs info buffers */ |
| 208 | long fs_cpc; /* cyl per cycle in postbl */ |
| 209 | short fs_opostbl[16][8]; /* old rotation block list head */ |
| 210 | long fs_sparecon[55]; /* reserved for future constants */ |
| 211 | long fs_state; /* validate fs_clean field */ |
| 212 | quad fs_qbmask; /* ~fs_bmask - for use with quad size */ |
| 213 | quad fs_qfmask; /* ~fs_fmask - for use with quad size */ |
| 214 | long fs_postblformat; /* format of positional layout tables */ |
| 215 | long fs_nrpos; /* number of rotaional positions */ |
| 216 | long fs_postbloff; /* (short) rotation block list head */ |
| 217 | long fs_rotbloff; /* (u_char) blocks for each rotation */ |
| 218 | long fs_magic; /* magic number */ |
| 219 | u_char fs_space[1]; /* list of blocks for each rotation */ |
| 220 | /* actually longer */ |
| 221 | }; |
| 222 | /* |
| 223 | * Preference for optimization. |
| 224 | */ |
| 225 | #define FS_OPTTIME 0 /* minimize allocation time */ |
| 226 | #define FS_OPTSPACE 1 /* minimize disk fragmentation */ |
| 227 | |
| 228 | /* |
| 229 | * Rotational layout table format types |
| 230 | */ |
| 231 | #define FS_42POSTBLFMT -1 /* 4.2BSD rotational table format */ |
| 232 | #define FS_DYNAMICPOSTBLFMT 1 /* dynamic rotational table format */ |
| 233 | /* |
| 234 | * Macros for access to superblock array structures |
| 235 | */ |
| 236 | #define fs_postbl(fs, cylno) \ |
| 237 | (((fs)->fs_postblformat == FS_42POSTBLFMT) \ |
| 238 | ? ((fs)->fs_opostbl[cylno]) \ |
| 239 | : ((short *)((char *)(fs) + (fs)->fs_postbloff) + (cylno) * (fs)->fs_nrpos)) |
| 240 | #define fs_rotbl(fs) \ |
| 241 | (((fs)->fs_postblformat == FS_42POSTBLFMT) \ |
| 242 | ? ((fs)->fs_space) \ |
| 243 | : ((u_char *)((char *)(fs) + (fs)->fs_rotbloff))) |
| 244 | |
| 245 | /* |
| 246 | * Convert cylinder group to base address of its global summary info. |
| 247 | * |
| 248 | * N.B. This macro assumes that sizeof(struct csum) is a power of two. |
| 249 | */ |
| 250 | #define fs_cs(fs, indx) \ |
| 251 | fs_csp[(indx) >> (fs)->fs_csshift][(indx) & ~(fs)->fs_csmask] |
| 252 | |
| 253 | /* |
| 254 | * Cylinder group block for a file system. |
| 255 | */ |
| 256 | #define CG_MAGIC 0x090255 |
| 257 | struct cg { |
| 258 | struct cg *cg_link; /* linked list of cyl groups */ |
| 259 | long cg_magic; /* magic number */ |
| 260 | time_t cg_time; /* time last written */ |
| 261 | long cg_cgx; /* we are the cgx'th cylinder group */ |
| 262 | short cg_ncyl; /* number of cyl's this cg */ |
| 263 | short cg_niblk; /* number of inode blocks this cg */ |
| 264 | long cg_ndblk; /* number of data blocks this cg */ |
| 265 | struct csum cg_cs; /* cylinder summary information */ |
| 266 | long cg_rotor; /* position of last used block */ |
| 267 | long cg_frotor; /* position of last used frag */ |
| 268 | long cg_irotor; /* position of last used inode */ |
| 269 | long cg_frsum[MAXFRAG]; /* counts of available frags */ |
| 270 | long cg_btotoff; /* (long) block totals per cylinder */ |
| 271 | long cg_boff; /* (short) free block positions */ |
| 272 | long cg_iusedoff; /* (char) used inode map */ |
| 273 | long cg_freeoff; /* (u_char) free block map */ |
| 274 | long cg_nextfreeoff; /* (u_char) next available space */ |
| 275 | long cg_sparecon[16]; /* reserved for future use */ |
| 276 | u_char cg_space[1]; /* space for cylinder group maps */ |
| 277 | /* actually longer */ |
| 278 | }; |
| 279 | /* |
| 280 | * Macros for access to cylinder group array structures |
| 281 | */ |
| 282 | #define cg_blktot(cgp) \ |
| 283 | (((cgp)->cg_magic != CG_MAGIC) \ |
| 284 | ? (((struct ocg *)(cgp))->cg_btot) \ |
| 285 | : ((long *)((char *)(cgp) + (cgp)->cg_btotoff))) |
| 286 | #define cg_blks(fs, cgp, cylno) \ |
| 287 | (((cgp)->cg_magic != CG_MAGIC) \ |
| 288 | ? (((struct ocg *)(cgp))->cg_b[cylno]) \ |
| 289 | : ((short *)((char *)(cgp) + (cgp)->cg_boff) + (cylno) * (fs)->fs_nrpos)) |
| 290 | #define cg_inosused(cgp) \ |
| 291 | (((cgp)->cg_magic != CG_MAGIC) \ |
| 292 | ? (((struct ocg *)(cgp))->cg_iused) \ |
| 293 | : ((char *)((char *)(cgp) + (cgp)->cg_iusedoff))) |
| 294 | #define cg_blksfree(cgp) \ |
| 295 | (((cgp)->cg_magic != CG_MAGIC) \ |
| 296 | ? (((struct ocg *)(cgp))->cg_free) \ |
| 297 | : ((u_char *)((char *)(cgp) + (cgp)->cg_freeoff))) |
| 298 | #define cg_chkmagic(cgp) \ |
| 299 | ((cgp)->cg_magic == CG_MAGIC || ((struct ocg *)(cgp))->cg_magic == CG_MAGIC) |
| 300 | |
| 301 | /* |
| 302 | * The following structure is defined |
| 303 | * for compatibility with old file systems. |
| 304 | */ |
| 305 | struct ocg { |
| 306 | struct ocg *cg_link; /* linked list of cyl groups */ |
| 307 | struct ocg *cg_rlink; /* used for incore cyl groups */ |
| 308 | time_t cg_time; /* time last written */ |
| 309 | long cg_cgx; /* we are the cgx'th cylinder group */ |
| 310 | short cg_ncyl; /* number of cyl's this cg */ |
| 311 | short cg_niblk; /* number of inode blocks this cg */ |
| 312 | long cg_ndblk; /* number of data blocks this cg */ |
| 313 | struct csum cg_cs; /* cylinder summary information */ |
| 314 | long cg_rotor; /* position of last used block */ |
| 315 | long cg_frotor; /* position of last used frag */ |
| 316 | long cg_irotor; /* position of last used inode */ |
| 317 | long cg_frsum[8]; /* counts of available frags */ |
| 318 | long cg_btot[32]; /* block totals per cylinder */ |
| 319 | short cg_b[32][8]; /* positions of free blocks */ |
| 320 | char cg_iused[256]; /* used inode map */ |
| 321 | long cg_magic; /* magic number */ |
| 322 | u_char cg_free[1]; /* free block map */ |
| 323 | /* actually longer */ |
| 324 | }; |
| 325 | |
| 326 | /* |
| 327 | * Turn file system block numbers into disk block addresses. |
| 328 | * This maps file system blocks to device size blocks. |
| 329 | */ |
| 330 | #define fsbtodb(fs, b) ((b) << (fs)->fs_fsbtodb) |
| 331 | #define dbtofsb(fs, b) ((b) >> (fs)->fs_fsbtodb) |
| 332 | |
| 333 | /* |
| 334 | * Cylinder group macros to locate things in cylinder groups. |
| 335 | * They calc file system addresses of cylinder group data structures. |
| 336 | */ |
| 337 | #define cgbase(fs, c) ((daddr_t)((fs)->fs_fpg * (c))) |
| 338 | #define cgstart(fs, c) \ |
| 339 | (cgbase(fs, c) + (fs)->fs_cgoffset * ((c) & ~((fs)->fs_cgmask))) |
| 340 | #define cgsblock(fs, c) (cgstart(fs, c) + (fs)->fs_sblkno) /* super blk */ |
| 341 | #define cgtod(fs, c) (cgstart(fs, c) + (fs)->fs_cblkno) /* cg block */ |
| 342 | #define cgimin(fs, c) (cgstart(fs, c) + (fs)->fs_iblkno) /* inode blk */ |
| 343 | #define cgdmin(fs, c) (cgstart(fs, c) + (fs)->fs_dblkno) /* 1st data */ |
| 344 | |
| 345 | /* |
| 346 | * Macros for handling inode numbers: |
| 347 | * inode number to file system block offset. |
| 348 | * inode number to cylinder group number. |
| 349 | * inode number to file system block address. |
| 350 | */ |
| 351 | #define itoo(fs, x) ((x) % INOPB(fs)) |
| 352 | #define itog(fs, x) ((x) / (fs)->fs_ipg) |
| 353 | #define itod(fs, x) \ |
| 354 | ((daddr_t)(cgimin(fs, itog(fs, x)) + \ |
| 355 | (blkstofrags((fs), (((x) % (fs)->fs_ipg) / INOPB(fs)))))) |
| 356 | |
| 357 | /* |
| 358 | * Give cylinder group number for a file system block. |
| 359 | * Give cylinder group block number for a file system block. |
| 360 | */ |
| 361 | #define dtog(fs, d) ((d) / (fs)->fs_fpg) |
| 362 | #define dtogd(fs, d) ((d) % (fs)->fs_fpg) |
| 363 | |
| 364 | /* |
| 365 | * Extract the bits for a block from a map. |
| 366 | * Compute the cylinder and rotational position of a cyl block addr. |
| 367 | */ |
| 368 | #define blkmap(fs, map, loc) \ |
| 369 | (((map)[(loc) / NBBY] >> ((loc) % NBBY)) & (0xff >> (NBBY - (fs)->fs_frag))) |
| 370 | #define cbtocylno(fs, bno) \ |
| 371 | ((bno) * NSPF(fs) / (fs)->fs_spc) |
| 372 | #define cbtorpos(fs, bno) \ |
| 373 | (((bno) * NSPF(fs) % (fs)->fs_spc / (fs)->fs_nsect * (fs)->fs_trackskew + \ |
| 374 | (bno) * NSPF(fs) % (fs)->fs_spc % (fs)->fs_nsect * (fs)->fs_interleave) % \ |
| 375 | (fs)->fs_nsect * (fs)->fs_nrpos / (fs)->fs_npsect) |
| 376 | |
| 377 | /* |
| 378 | * The following macros optimize certain frequently calculated |
| 379 | * quantities by using shifts and masks in place of divisions |
| 380 | * modulos and multiplications. |
| 381 | */ |
| 382 | #define blkoff(fs, loc) /* calculates (loc % fs->fs_bsize) */ \ |
| 383 | ((loc) & ~(fs)->fs_bmask) |
| 384 | #define fragoff(fs, loc) /* calculates (loc % fs->fs_fsize) */ \ |
| 385 | ((loc) & ~(fs)->fs_fmask) |
| 386 | #define lblktosize(fs, blk) /* calculates (blk * fs->fs_bsize) */ \ |
| 387 | ((blk) << (fs)->fs_bshift) |
| 388 | #define lblkno(fs, loc) /* calculates (loc / fs->fs_bsize) */ \ |
| 389 | ((loc) >> (fs)->fs_bshift) |
| 390 | #define numfrags(fs, loc) /* calculates (loc / fs->fs_fsize) */ \ |
| 391 | ((loc) >> (fs)->fs_fshift) |
| 392 | #define blkroundup(fs, size) /* calculates roundup(size, fs->fs_bsize) */ \ |
| 393 | (((size) + (fs)->fs_bsize - 1) & (fs)->fs_bmask) |
| 394 | #define fragroundup(fs, size) /* calculates roundup(size, fs->fs_fsize) */ \ |
| 395 | (((size) + (fs)->fs_fsize - 1) & (fs)->fs_fmask) |
| 396 | #define fragstoblks(fs, frags) /* calculates (frags / fs->fs_frag) */ \ |
| 397 | ((frags) >> (fs)->fs_fragshift) |
| 398 | #define blkstofrags(fs, blks) /* calculates (blks * fs->fs_frag) */ \ |
| 399 | ((blks) << (fs)->fs_fragshift) |
| 400 | #define fragnum(fs, fsb) /* calculates (fsb % fs->fs_frag) */ \ |
| 401 | ((fsb) & ((fs)->fs_frag - 1)) |
| 402 | #define blknum(fs, fsb) /* calculates rounddown(fsb, fs->fs_frag) */ \ |
| 403 | ((fsb) &~ ((fs)->fs_frag - 1)) |
| 404 | |
| 405 | /* |
| 406 | * Determine the number of available frags given a |
| 407 | * percentage to hold in reserve |
| 408 | */ |
| 409 | #define freespace(fs, percentreserved) \ |
| 410 | (blkstofrags((fs), (fs)->fs_cstotal.cs_nbfree) + \ |
| 411 | (fs)->fs_cstotal.cs_nffree - ((fs)->fs_dsize * (percentreserved) / 100)) |
| 412 | |
| 413 | /* |
| 414 | * Determining the size of a file block in the file system. |
| 415 | */ |
| 416 | #define blksize(fs, ip, lbn) \ |
| 417 | (((lbn) >= NDADDR || (ip)->i_size >= ((lbn) + 1) << (fs)->fs_bshift) \ |
| 418 | ? (fs)->fs_bsize \ |
| 419 | : (fragroundup(fs, blkoff(fs, (ip)->i_size)))) |
| 420 | #define dblksize(fs, dip, lbn) \ |
| 421 | (((lbn) >= NDADDR || (dip)->di_size >= ((lbn) + 1) << (fs)->fs_bshift) \ |
| 422 | ? (fs)->fs_bsize \ |
| 423 | : (fragroundup(fs, blkoff(fs, (dip)->di_size)))) |
| 424 | |
| 425 | /* |
| 426 | * Number of disk sectors per block; assumes DEV_BSIZE byte sector size. |
| 427 | */ |
| 428 | #define NSPB(fs) ((fs)->fs_nspf << (fs)->fs_fragshift) |
| 429 | #define NSPF(fs) ((fs)->fs_nspf) |
| 430 | |
| 431 | /* |
| 432 | * INOPB is the number of inodes in a secondary storage block. |
| 433 | */ |
| 434 | #define INOPB(fs) ((fs)->fs_inopb) |
| 435 | #define INOPF(fs) ((fs)->fs_inopb >> (fs)->fs_fragshift) |
| 436 | |
| 437 | /* |
| 438 | * NINDIR is the number of indirects in a file system block. |
| 439 | */ |
| 440 | #define NINDIR(fs) ((fs)->fs_nindir) |