fs.h revision 1.42
1 /* $NetBSD: fs.h,v 1.42 2004/03/20 17:26:16 dsl Exp $ */ 2 3 /* 4 * Copyright (c) 1982, 1986, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 * 31 * @(#)fs.h 8.13 (Berkeley) 3/21/95 32 */ 33 34 #ifndef _UFS_FFS_FS_H_ 35 #define _UFS_FFS_FS_H_ 36 37 /* 38 * Each disk drive contains some number of file systems. 39 * A file system consists of a number of cylinder groups. 40 * Each cylinder group has inodes and data. 41 * 42 * A file system is described by its super-block, which in turn 43 * describes the cylinder groups. The super-block is critical 44 * data and is replicated in each cylinder group to protect against 45 * catastrophic loss. This is done at `newfs' time and the critical 46 * super-block data does not change, so the copies need not be 47 * referenced further unless disaster strikes. 48 * 49 * For file system fs, the offsets of the various blocks of interest 50 * are given in the super block as: 51 * [fs->fs_sblkno] Super-block 52 * [fs->fs_cblkno] Cylinder group block 53 * [fs->fs_iblkno] Inode blocks 54 * [fs->fs_dblkno] Data blocks 55 * The beginning of cylinder group cg in fs, is given by 56 * the ``cgbase(fs, cg)'' macro. 57 * 58 * Depending on the architecture and the media, the superblock may 59 * reside in any one of four places. For tiny media where every block 60 * counts, it is placed at the very front of the partition. Historically, 61 * UFS1 placed it 8K from the front to leave room for the disk label and 62 * a small bootstrap. For UFS2 it got moved to 64K from the front to leave 63 * room for the disk label and a bigger bootstrap, and for really piggy 64 * systems we check at 256K from the front if the first three fail. In 65 * all cases the size of the superblock will be SBLOCKSIZE. All values are 66 * given in byte-offset form, so they do not imply a sector size. The 67 * SBLOCKSEARCH specifies the order in which the locations should be searched. 68 * 69 * Unfortunately the UFS2/FFSv2 change was done without adequate consideration 70 * of backward compatibility. In particular 'newfs' for a FFSv2 partition 71 * must overwrite any old FFSv1 superblock at 8k, and preferrably as many 72 * of the alternates as it can find - otherwise attempting to mount on a 73 * system that only supports FFSv1 is likely to succeed!. 74 * For a small FFSv1 filesystem, an old FFSv2 superblock can be left on 75 * the disk, and a system that tries to find an FFSv2 filesystem in preference 76 * to and FFSv1 one (as NetBSD does) can mount the old FFSv2 filesystem. 77 * As a added bonus, the 'first alternate' superblock of a FFSv1 filesystem 78 * with 64k blocks is at 64k - just where the code looks first when playing 79 * 'hunt the superblock'. 80 */ 81 #define BBSIZE 8192 82 #define BBOFF ((off_t)(0)) 83 #define BBLOCK ((daddr_t)(0)) 84 85 #define SBLOCK_FLOPPY 0 86 #define SBLOCK_UFS1 8192 87 #define SBLOCK_UFS2 65536 88 #define SBLOCK_PIGGY 262144 89 #define SBLOCKSIZE 8192 90 /* 91 * NB: Do not, under any circumstances, look for an ffsv1 filesystem at 92 * SBLOCK_UFS2. Doing so will find the wrong superblock for filesystems 93 * with a 64k block size. 94 */ 95 #define SBLOCKSEARCH \ 96 { SBLOCK_UFS2, SBLOCK_UFS1, SBLOCK_FLOPPY, SBLOCK_PIGGY, -1 } 97 98 /* 99 * Max number of fragments per block. This value is NOT tweakable. 100 */ 101 #define MAXFRAG 8 102 103 104 105 /* 106 * Addresses stored in inodes are capable of addressing fragments 107 * of `blocks'. File system blocks of at most size MAXBSIZE can 108 * be optionally broken into 2, 4, or 8 pieces, each of which is 109 * addressable; these pieces may be DEV_BSIZE, or some multiple of 110 * a DEV_BSIZE unit. 111 * 112 * Large files consist of exclusively large data blocks. To avoid 113 * undue wasted disk space, the last data block of a small file may be 114 * allocated as only as many fragments of a large block as are 115 * necessary. The file system format retains only a single pointer 116 * to such a fragment, which is a piece of a single large block that 117 * has been divided. The size of such a fragment is determinable from 118 * information in the inode, using the ``blksize(fs, ip, lbn)'' macro. 119 * 120 * The file system records space availability at the fragment level; 121 * to determine block availability, aligned fragments are examined. 122 */ 123 124 /* 125 * MINBSIZE is the smallest allowable block size. 126 * In order to insure that it is possible to create files of size 127 * 2^32 with only two levels of indirection, MINBSIZE is set to 4096. 128 * MINBSIZE must be big enough to hold a cylinder group block, 129 * thus changes to (struct cg) must keep its size within MINBSIZE. 130 * Note that super blocks are always of size SBSIZE, 131 * and that both SBSIZE and MAXBSIZE must be >= MINBSIZE. 132 */ 133 #define MINBSIZE 4096 134 135 /* 136 * The path name on which the file system is mounted is maintained 137 * in fs_fsmnt. MAXMNTLEN defines the amount of space allocated in 138 * the super block for this name. 139 */ 140 #define MAXMNTLEN 468 141 142 /* 143 * The volume name for this filesystem is maintained in fs_volname. 144 * MAXVOLLEN defines the length of the buffer allocated. 145 * This space used to be part of of fs_fsmnt. 146 */ 147 #define MAXVOLLEN 32 148 149 /* 150 * There is a 128-byte region in the superblock reserved for in-core 151 * pointers to summary information. Originally this included an array 152 * of pointers to blocks of struct csum; now there are just four 153 * pointers and the remaining space is padded with fs_ocsp[]. 154 * NOCSPTRS determines the size of this padding. One pointer (fs_csp) 155 * is taken away to point to a contiguous array of struct csum for 156 * all cylinder groups; a second (fs_maxcluster) points to an array 157 * of cluster sizes that is computed as cylinder groups are inspected; 158 * the third (fs_contigdirs) points to an array that tracks the 159 * creation of new directories; and the fourth (fs_active) is used 160 * by snapshots. 161 */ 162 #define NOCSPTRS ((128 / sizeof(void *)) - 4) 163 164 /* 165 * A summary of contiguous blocks of various sizes is maintained 166 * in each cylinder group. Normally this is set by the initial 167 * value of fs_maxcontig. To conserve space, a maximum summary size 168 * is set by FS_MAXCONTIG. 169 */ 170 #define FS_MAXCONTIG 16 171 172 /* 173 * Unused value currently, FreeBSD compat. 174 */ 175 #define FSMAXSNAP 20 176 177 /* 178 * MINFREE gives the minimum acceptable percentage of file system 179 * blocks which may be free. If the freelist drops below this level 180 * only the superuser may continue to allocate blocks. This may 181 * be set to 0 if no reserve of free blocks is deemed necessary, 182 * however throughput drops by fifty percent if the file system 183 * is run at between 95% and 100% full; thus the minimum default 184 * value of fs_minfree is 5%. However, to get good clustering 185 * performance, 10% is a better choice. hence we use 10% as our 186 * default value. With 10% free space, fragmentation is not a 187 * problem, so we choose to optimize for time. 188 */ 189 #define MINFREE 5 190 #define DEFAULTOPT FS_OPTTIME 191 192 /* 193 * Grigoriy Orlov <gluk (at) ptci.ru> has done some extensive work to fine 194 * tune the layout preferences for directories within a filesystem. 195 * His algorithm can be tuned by adjusting the following parameters 196 * which tell the system the average file size and the average number 197 * of files per directory. These defaults are well selected for typical 198 * filesystems, but may need to be tuned for odd cases like filesystems 199 * being used for squid caches or news spools. 200 */ 201 #define AVFILESIZ 16384 /* expected average file size */ 202 #define AFPDIR 64 /* expected number of files per directory */ 203 204 /* 205 * Per cylinder group information; summarized in blocks allocated 206 * from first cylinder group data blocks. These blocks have to be 207 * read in from fs_csaddr (size fs_cssize) in addition to the 208 * super block. 209 */ 210 struct csum { 211 int32_t cs_ndir; /* number of directories */ 212 int32_t cs_nbfree; /* number of free blocks */ 213 int32_t cs_nifree; /* number of free inodes */ 214 int32_t cs_nffree; /* number of free frags */ 215 }; 216 217 struct csum_total { 218 int64_t cs_ndir; /* number of directories */ 219 int64_t cs_nbfree; /* number of free blocks */ 220 int64_t cs_nifree; /* number of free inodes */ 221 int64_t cs_nffree; /* number of free frags */ 222 int64_t cs_spare[4]; /* future expansion */ 223 }; 224 225 226 /* 227 * Super block for an FFS file system in memory. 228 */ 229 struct fs { 230 int32_t fs_firstfield; /* historic file system linked list, */ 231 int32_t fs_unused_1; /* used for incore super blocks */ 232 int32_t fs_sblkno; /* addr of super-block in filesys */ 233 int32_t fs_cblkno; /* offset of cyl-block in filesys */ 234 int32_t fs_iblkno; /* offset of inode-blocks in filesys */ 235 int32_t fs_dblkno; /* offset of first data after cg */ 236 int32_t fs_old_cgoffset; /* cylinder group offset in cylinder */ 237 int32_t fs_old_cgmask; /* used to calc mod fs_ntrak */ 238 int32_t fs_old_time; /* last time written */ 239 int32_t fs_old_size; /* number of blocks in fs */ 240 int32_t fs_old_dsize; /* number of data blocks in fs */ 241 int32_t fs_ncg; /* number of cylinder groups */ 242 int32_t fs_bsize; /* size of basic blocks in fs */ 243 int32_t fs_fsize; /* size of frag blocks in fs */ 244 int32_t fs_frag; /* number of frags in a block in fs */ 245 /* these are configuration parameters */ 246 int32_t fs_minfree; /* minimum percentage of free blocks */ 247 int32_t fs_old_rotdelay; /* num of ms for optimal next block */ 248 int32_t fs_old_rps; /* disk revolutions per second */ 249 /* these fields can be computed from the others */ 250 int32_t fs_bmask; /* ``blkoff'' calc of blk offsets */ 251 int32_t fs_fmask; /* ``fragoff'' calc of frag offsets */ 252 int32_t fs_bshift; /* ``lblkno'' calc of logical blkno */ 253 int32_t fs_fshift; /* ``numfrags'' calc number of frags */ 254 /* these are configuration parameters */ 255 int32_t fs_maxcontig; /* max number of contiguous blks */ 256 int32_t fs_maxbpg; /* max number of blks per cyl group */ 257 /* these fields can be computed from the others */ 258 int32_t fs_fragshift; /* block to frag shift */ 259 int32_t fs_fsbtodb; /* fsbtodb and dbtofsb shift constant */ 260 int32_t fs_sbsize; /* actual size of super block */ 261 int32_t fs_spare1[2]; /* old fs_csmask */ 262 /* old fs_csshift */ 263 int32_t fs_nindir; /* value of NINDIR */ 264 int32_t fs_inopb; /* value of INOPB */ 265 int32_t fs_old_nspf; /* value of NSPF */ 266 /* yet another configuration parameter */ 267 int32_t fs_optim; /* optimization preference, see below */ 268 /* these fields are derived from the hardware */ 269 int32_t fs_old_npsect; /* # sectors/track including spares */ 270 int32_t fs_old_interleave; /* hardware sector interleave */ 271 int32_t fs_old_trackskew; /* sector 0 skew, per track */ 272 /* fs_id takes the space of the unused fs_headswitch and fs_trkseek fields */ 273 int32_t fs_id[2]; /* unique file system id */ 274 /* sizes determined by number of cylinder groups and their sizes */ 275 int32_t fs_old_csaddr; /* blk addr of cyl grp summary area */ 276 int32_t fs_cssize; /* size of cyl grp summary area */ 277 int32_t fs_cgsize; /* cylinder group size */ 278 /* these fields are derived from the hardware */ 279 int32_t fs_spare2; /* old fs_ntrak */ 280 int32_t fs_old_nsect; /* sectors per track */ 281 int32_t fs_old_spc; /* sectors per cylinder */ 282 int32_t fs_old_ncyl; /* cylinders in file system */ 283 int32_t fs_old_cpg; /* cylinders per group */ 284 int32_t fs_ipg; /* inodes per group */ 285 int32_t fs_fpg; /* blocks per group * fs_frag */ 286 /* this data must be re-computed after crashes */ 287 struct csum fs_old_cstotal; /* cylinder summary information */ 288 /* these fields are cleared at mount time */ 289 int8_t fs_fmod; /* super block modified flag */ 290 int8_t fs_clean; /* file system is clean flag */ 291 int8_t fs_ronly; /* mounted read-only flag */ 292 uint8_t fs_old_flags; /* see FS_ flags below */ 293 u_char fs_fsmnt[MAXMNTLEN]; /* name mounted on */ 294 u_char fs_volname[MAXVOLLEN]; /* volume name */ 295 uint64_t fs_swuid; /* system-wide uid */ 296 int32_t fs_pad; 297 /* these fields retain the current block allocation info */ 298 int32_t fs_cgrotor; /* last cg searched (UNUSED) */ 299 void *fs_ocsp[NOCSPTRS]; /* padding; was list of fs_cs buffers */ 300 u_int8_t *fs_contigdirs; /* # of contiguously allocated dirs */ 301 struct csum *fs_csp; /* cg summary info buffer for fs_cs */ 302 int32_t *fs_maxcluster; /* max cluster in each cyl group */ 303 u_int *fs_active; /* used by snapshots to track fs */ 304 int32_t fs_old_cpc; /* cyl per cycle in postbl */ 305 /* this area is otherwise allocated in filesystems created before ffsv2 */ 306 int32_t fs_maxbsize; /* maximum blocking factor permitted */ 307 int64_t fs_sparecon64[17]; /* old rotation block list head */ 308 int64_t fs_sblockloc; /* byte offset of standard superblock */ 309 struct csum_total fs_cstotal; /* cylinder summary information */ 310 int64_t fs_time; /* last time written */ 311 int64_t fs_size; /* number of blocks in fs */ 312 int64_t fs_dsize; /* number of data blocks in fs */ 313 int64_t fs_csaddr; /* blk addr of cyl grp summary area */ 314 int64_t fs_pendingblocks; /* blocks in process of being freed */ 315 int32_t fs_pendinginodes; /* inodes in process of being freed */ 316 int32_t fs_snapinum[FSMAXSNAP];/* list of snapshot inode numbers */ 317 /* back to stuff that has been around a while */ 318 int32_t fs_avgfilesize; /* expected average file size */ 319 int32_t fs_avgfpdir; /* expected # of files per directory */ 320 int32_t fs_save_cgsize; /* save real cg size to use fs_bsize */ 321 int32_t fs_sparecon32[26]; /* reserved for future constants */ 322 uint32_t fs_flags; /* see FS_ flags below */ 323 /* back to stuff that has been around a while (again) */ 324 int32_t fs_contigsumsize; /* size of cluster summary array */ 325 int32_t fs_maxsymlinklen; /* max length of an internal symlink */ 326 int32_t fs_old_inodefmt; /* format of on-disk inodes */ 327 u_int64_t fs_maxfilesize; /* maximum representable file size */ 328 int64_t fs_qbmask; /* ~fs_bmask for use with 64-bit size */ 329 int64_t fs_qfmask; /* ~fs_fmask for use with 64-bit size */ 330 int32_t fs_state; /* validate fs_clean field (UNUSED) */ 331 int32_t fs_old_postblformat; /* format of positional layout tables */ 332 int32_t fs_old_nrpos; /* number of rotational positions */ 333 int32_t fs_spare5[2]; /* old fs_postbloff */ 334 /* old fs_rotbloff */ 335 int32_t fs_magic; /* magic number */ 336 }; 337 338 #define fs_old_postbloff fs_spare5[0] 339 #define fs_old_rotbloff fs_spare5[1] 340 #define fs_old_postbl_start fs_maxbsize 341 #define fs_old_headswitch fs_id[0] 342 #define fs_old_trkseek fs_id[1] 343 #define fs_old_csmask fs_spare1[0] 344 #define fs_old_csshift fs_spare1[1] 345 346 #define FS_42POSTBLFMT -1 /* 4.2BSD rotational table format */ 347 #define FS_DYNAMICPOSTBLFMT 1 /* dynamic rotational table format */ 348 349 #define old_fs_postbl(fs_, cylno, opostblsave) \ 350 ((((fs_)->fs_old_postblformat == FS_42POSTBLFMT) || \ 351 ((fs_)->fs_old_postbloff == offsetof(struct fs, fs_old_postbl_start))) \ 352 ? ((int16_t *)(opostblsave) + (cylno) * (fs_)->fs_old_nrpos) \ 353 : ((int16_t *)((uint8_t *)(fs_) + \ 354 (fs_)->fs_old_postbloff) + (cylno) * (fs_)->fs_old_nrpos)) 355 #define old_fs_rotbl(fs) \ 356 (((fs)->fs_old_postblformat == FS_42POSTBLFMT) \ 357 ? ((uint8_t *)(&(fs)->fs_magic+1)) \ 358 : ((uint8_t *)((uint8_t *)(fs) + (fs)->fs_old_rotbloff))) 359 360 /* 361 * File system identification 362 */ 363 #define FS_UFS1_MAGIC 0x011954 /* UFS1 fast file system magic number */ 364 #define FS_UFS2_MAGIC 0x19540119 /* UFS2 fast file system magic number */ 365 #define FS_UFS1_MAGIC_SWAPPED 0x54190100 366 #define FS_UFS2_MAGIC_SWAPPED 0x19015419 367 #define FS_OKAY 0x7c269d38 /* superblock checksum */ 368 #define FS_42INODEFMT -1 /* 4.2BSD inode format */ 369 #define FS_44INODEFMT 2 /* 4.4BSD inode format */ 370 371 /* 372 * File system clean flags 373 */ 374 #define FS_ISCLEAN 0x01 375 #define FS_WASCLEAN 0x02 376 377 /* 378 * Preference for optimization. 379 */ 380 #define FS_OPTTIME 0 /* minimize allocation time */ 381 #define FS_OPTSPACE 1 /* minimize disk fragmentation */ 382 383 /* 384 * File system flags 385 */ 386 #define FS_UNCLEAN 0x01 /* file system not clean at mount (unused) */ 387 #define FS_DOSOFTDEP 0x02 /* file system using soft dependencies */ 388 #define FS_NEEDSFSCK 0x04 /* needs sync fsck (FreeBSD compat, unused) */ 389 #define FS_INDEXDIRS 0x08 /* kernel supports indexed directories */ 390 #define FS_ACLS 0x10 /* file system has ACLs enabled */ 391 #define FS_MULTILABEL 0x20 /* file system is MAC multi-label */ 392 #define FS_FLAGS_UPDATED 0x80 /* flags have been moved to new location */ 393 394 /* 395 * File system internal flags, also in fs_flags. 396 * (Pick highest number to avoid conflicts with others) 397 */ 398 #define FS_SWAPPED 0x80000000 /* file system is endian swapped */ 399 #define FS_INTERNAL 0x80000000 /* mask for internal flags */ 400 401 /* 402 * The size of a cylinder group is calculated by CGSIZE. The maximum size 403 * is limited by the fact that cylinder groups are at most one block. 404 * Its size is derived from the size of the maps maintained in the 405 * cylinder group and the (struct cg) size. 406 */ 407 #define CGSIZE_IF(fs, ipg, fpg) \ 408 /* base cg */ (sizeof(struct cg) + sizeof(int32_t) + \ 409 /* old btotoff */ (fs)->fs_old_cpg * sizeof(int32_t) + \ 410 /* old boff */ (fs)->fs_old_cpg * sizeof(u_int16_t) + \ 411 /* inode map */ howmany((ipg), NBBY) + \ 412 /* block map */ howmany((fpg), NBBY) +\ 413 /* if present */ ((fs)->fs_contigsumsize <= 0 ? 0 : \ 414 /* cluster sum */ (fs)->fs_contigsumsize * sizeof(int32_t) + \ 415 /* cluster map */ howmany(fragstoblks(fs, (fpg)), NBBY))) 416 417 #define CGSIZE(fs) CGSIZE_IF((fs), (fs)->fs_ipg, (fs)->fs_fpg) 418 419 /* 420 * The minimal number of cylinder groups that should be created. 421 */ 422 #define MINCYLGRPS 4 423 424 425 /* 426 * Convert cylinder group to base address of its global summary info. 427 */ 428 #define fs_cs(fs, indx) fs_csp[indx] 429 430 /* 431 * Cylinder group block for a file system. 432 */ 433 #define CG_MAGIC 0x090255 434 struct cg { 435 int32_t cg_firstfield; /* historic cyl groups linked list */ 436 int32_t cg_magic; /* magic number */ 437 int32_t cg_old_time; /* time last written */ 438 int32_t cg_cgx; /* we are the cgx'th cylinder group */ 439 int16_t cg_old_ncyl; /* number of cyl's this cg */ 440 int16_t cg_old_niblk; /* number of inode blocks this cg */ 441 int32_t cg_ndblk; /* number of data blocks this cg */ 442 struct csum cg_cs; /* cylinder summary information */ 443 int32_t cg_rotor; /* position of last used block */ 444 int32_t cg_frotor; /* position of last used frag */ 445 int32_t cg_irotor; /* position of last used inode */ 446 int32_t cg_frsum[MAXFRAG]; /* counts of available frags */ 447 int32_t cg_old_btotoff; /* (int32) block totals per cylinder */ 448 int32_t cg_old_boff; /* (u_int16) free block positions */ 449 int32_t cg_iusedoff; /* (u_int8) used inode map */ 450 int32_t cg_freeoff; /* (u_int8) free block map */ 451 int32_t cg_nextfreeoff; /* (u_int8) next available space */ 452 int32_t cg_clustersumoff; /* (u_int32) counts of avail clusters */ 453 int32_t cg_clusteroff; /* (u_int8) free cluster map */ 454 int32_t cg_nclusterblks; /* number of clusters this cg */ 455 int32_t cg_niblk; /* number of inode blocks this cg */ 456 int32_t cg_initediblk; /* last initialized inode */ 457 int32_t cg_sparecon32[3]; /* reserved for future use */ 458 int64_t cg_time; /* time last written */ 459 int64_t cg_sparecon64[3]; /* reserved for future use */ 460 u_int8_t cg_space[1]; /* space for cylinder group maps */ 461 /* actually longer */ 462 }; 463 464 /* 465 * The following structure is defined 466 * for compatibility with old file systems. 467 */ 468 struct ocg { 469 int32_t cg_firstfield; /* historic linked list of cyl groups */ 470 int32_t cg_unused_1; /* used for incore cyl groups */ 471 int32_t cg_time; /* time last written */ 472 int32_t cg_cgx; /* we are the cgx'th cylinder group */ 473 int16_t cg_ncyl; /* number of cyl's this cg */ 474 int16_t cg_niblk; /* number of inode blocks this cg */ 475 int32_t cg_ndblk; /* number of data blocks this cg */ 476 struct csum cg_cs; /* cylinder summary information */ 477 int32_t cg_rotor; /* position of last used block */ 478 int32_t cg_frotor; /* position of last used frag */ 479 int32_t cg_irotor; /* position of last used inode */ 480 int32_t cg_frsum[8]; /* counts of available frags */ 481 int32_t cg_btot[32]; /* block totals per cylinder */ 482 int16_t cg_b[32][8]; /* positions of free blocks */ 483 u_int8_t cg_iused[256]; /* used inode map */ 484 int32_t cg_magic; /* magic number */ 485 u_int8_t cg_free[1]; /* free block map */ 486 /* actually longer */ 487 }; 488 489 490 /* 491 * Macros for access to cylinder group array structures. 492 */ 493 #define old_cg_blktot_old(cgp, ns) \ 494 (((struct ocg *)(cgp))->cg_btot) 495 #define old_cg_blks_old(fs, cgp, cylno, ns) \ 496 (((struct ocg *)(cgp))->cg_b[cylno]) 497 498 #define old_cg_blktot_new(cgp, ns) \ 499 ((int32_t *)((u_int8_t *)(cgp) + \ 500 ufs_rw32((cgp)->cg_old_btotoff, (ns)))) 501 #define old_cg_blks_new(fs, cgp, cylno, ns) \ 502 ((int16_t *)((u_int8_t *)(cgp) + \ 503 ufs_rw32((cgp)->cg_old_boff, (ns))) + (cylno) * (fs)->fs_old_nrpos) 504 505 #define old_cg_blktot(cgp, ns) \ 506 ((ufs_rw32((cgp)->cg_magic, (ns)) != CG_MAGIC) ? \ 507 old_cg_blktot_old(cgp, ns) : old_cg_blktot_new(cgp, ns)) 508 #define old_cg_blks(fs, cgp, cylno, ns) \ 509 ((ufs_rw32((cgp)->cg_magic, (ns)) != CG_MAGIC) ? \ 510 old_cg_blks_old(fs, cgp, cylno, ns) : old_cg_blks_new(fs, cgp, cylno, ns)) 511 512 #define cg_inosused_new(cgp, ns) \ 513 ((u_int8_t *)((u_int8_t *)(cgp) + \ 514 ufs_rw32((cgp)->cg_iusedoff, (ns)))) 515 #define cg_blksfree_new(cgp, ns) \ 516 ((u_int8_t *)((u_int8_t *)(cgp) + \ 517 ufs_rw32((cgp)->cg_freeoff, (ns)))) 518 #define cg_chkmagic_new(cgp, ns) \ 519 (ufs_rw32((cgp)->cg_magic, (ns)) == CG_MAGIC) 520 521 #define cg_inosused_old(cgp, ns) \ 522 (((struct ocg *)(cgp))->cg_iused) 523 #define cg_blksfree_old(cgp, ns) \ 524 (((struct ocg *)(cgp))->cg_free) 525 #define cg_chkmagic_old(cgp, ns) \ 526 (ufs_rw32(((struct ocg *)(cgp))->cg_magic, (ns)) == CG_MAGIC) 527 528 #define cg_inosused(cgp, ns) \ 529 ((ufs_rw32((cgp)->cg_magic, (ns)) != CG_MAGIC) ? \ 530 cg_inosused_old(cgp, ns) : cg_inosused_new(cgp, ns)) 531 #define cg_blksfree(cgp, ns) \ 532 ((ufs_rw32((cgp)->cg_magic, (ns)) != CG_MAGIC) ? \ 533 cg_blksfree_old(cgp, ns) : cg_blksfree_new(cgp, ns)) 534 #define cg_chkmagic(cgp, ns) \ 535 (cg_chkmagic_new(cgp, ns) || cg_chkmagic_old(cgp, ns)) 536 537 #define cg_clustersfree(cgp, ns) \ 538 ((u_int8_t *)((u_int8_t *)(cgp) + \ 539 ufs_rw32((cgp)->cg_clusteroff, (ns)))) 540 #define cg_clustersum(cgp, ns) \ 541 ((int32_t *)((u_int8_t *)(cgp) + \ 542 ufs_rw32((cgp)->cg_clustersumoff, (ns)))) 543 544 545 /* 546 * Turn file system block numbers into disk block addresses. 547 * This maps file system blocks to device size blocks. 548 */ 549 #define fsbtodb(fs, b) ((b) << (fs)->fs_fsbtodb) 550 #define dbtofsb(fs, b) ((b) >> (fs)->fs_fsbtodb) 551 552 /* 553 * Cylinder group macros to locate things in cylinder groups. 554 * They calc file system addresses of cylinder group data structures. 555 */ 556 #define cgbase(fs, c) (((daddr_t)(fs)->fs_fpg) * (c)) 557 #define cgstart_ufs1(fs, c) \ 558 (cgbase(fs, c) + (fs)->fs_old_cgoffset * ((c) & ~((fs)->fs_old_cgmask))) 559 #define cgstart_ufs2(fs, c) cgbase((fs), (c)) 560 #define cgstart(fs, c) ((fs)->fs_magic == FS_UFS2_MAGIC \ 561 ? cgstart_ufs2((fs), (c)) : cgstart_ufs1((fs), (c))) 562 #define cgdmin(fs, c) (cgstart(fs, c) + (fs)->fs_dblkno) /* 1st data */ 563 #define cgimin(fs, c) (cgstart(fs, c) + (fs)->fs_iblkno) /* inode blk */ 564 #define cgsblock(fs, c) (cgstart(fs, c) + (fs)->fs_sblkno) /* super blk */ 565 #define cgtod(fs, c) (cgstart(fs, c) + (fs)->fs_cblkno) /* cg block */ 566 567 /* 568 * Macros for handling inode numbers: 569 * inode number to file system block offset. 570 * inode number to cylinder group number. 571 * inode number to file system block address. 572 */ 573 #define ino_to_cg(fs, x) ((x) / (fs)->fs_ipg) 574 #define ino_to_fsba(fs, x) \ 575 ((daddr_t)(cgimin(fs, ino_to_cg(fs, x)) + \ 576 (blkstofrags((fs), (((x) % (fs)->fs_ipg) / INOPB(fs)))))) 577 #define ino_to_fsbo(fs, x) ((x) % INOPB(fs)) 578 579 /* 580 * Give cylinder group number for a file system block. 581 * Give cylinder group block number for a file system block. 582 */ 583 #define dtog(fs, d) ((d) / (fs)->fs_fpg) 584 #define dtogd(fs, d) ((d) % (fs)->fs_fpg) 585 586 /* 587 * Extract the bits for a block from a map. 588 * Compute the cylinder and rotational position of a cyl block addr. 589 */ 590 #define blkmap(fs, map, loc) \ 591 (((map)[(loc) / NBBY] >> ((loc) % NBBY)) & (0xff >> (NBBY - (fs)->fs_frag))) 592 #define old_cbtocylno(fs, bno) \ 593 (fsbtodb(fs, bno) / (fs)->fs_old_spc) 594 #define old_cbtorpos(fs, bno) \ 595 ((fs)->fs_old_nrpos <= 1 ? 0 : \ 596 (fsbtodb(fs, bno) % (fs)->fs_old_spc / (fs)->fs_old_nsect * (fs)->fs_old_trackskew + \ 597 fsbtodb(fs, bno) % (fs)->fs_old_spc % (fs)->fs_old_nsect * (fs)->fs_old_interleave) % \ 598 (fs)->fs_old_nsect * (fs)->fs_old_nrpos / (fs)->fs_old_npsect) 599 600 /* 601 * The following macros optimize certain frequently calculated 602 * quantities by using shifts and masks in place of divisions 603 * modulos and multiplications. 604 */ 605 #define blkoff(fs, loc) /* calculates (loc % fs->fs_bsize) */ \ 606 ((loc) & (fs)->fs_qbmask) 607 #define fragoff(fs, loc) /* calculates (loc % fs->fs_fsize) */ \ 608 ((loc) & (fs)->fs_qfmask) 609 #define lfragtosize(fs, frag) /* calculates ((off_t)frag * fs->fs_fsize) */ \ 610 (((off_t)(frag)) << (fs)->fs_fshift) 611 #define lblktosize(fs, blk) /* calculates ((off_t)blk * fs->fs_bsize) */ \ 612 (((off_t)(blk)) << (fs)->fs_bshift) 613 #define lblkno(fs, loc) /* calculates (loc / fs->fs_bsize) */ \ 614 ((loc) >> (fs)->fs_bshift) 615 #define numfrags(fs, loc) /* calculates (loc / fs->fs_fsize) */ \ 616 ((loc) >> (fs)->fs_fshift) 617 #define blkroundup(fs, size) /* calculates roundup(size, fs->fs_bsize) */ \ 618 (((size) + (fs)->fs_qbmask) & (fs)->fs_bmask) 619 #define fragroundup(fs, size) /* calculates roundup(size, fs->fs_fsize) */ \ 620 (((size) + (fs)->fs_qfmask) & (fs)->fs_fmask) 621 #define fragstoblks(fs, frags) /* calculates (frags / fs->fs_frag) */ \ 622 ((frags) >> (fs)->fs_fragshift) 623 #define blkstofrags(fs, blks) /* calculates (blks * fs->fs_frag) */ \ 624 ((blks) << (fs)->fs_fragshift) 625 #define fragnum(fs, fsb) /* calculates (fsb % fs->fs_frag) */ \ 626 ((fsb) & ((fs)->fs_frag - 1)) 627 #define blknum(fs, fsb) /* calculates rounddown(fsb, fs->fs_frag) */ \ 628 ((fsb) &~ ((fs)->fs_frag - 1)) 629 630 /* 631 * Determine the number of available frags given a 632 * percentage to hold in reserve. 633 */ 634 #define freespace(fs, percentreserved) \ 635 (blkstofrags((fs), (fs)->fs_cstotal.cs_nbfree) + \ 636 (fs)->fs_cstotal.cs_nffree - \ 637 (((off_t)((fs)->fs_dsize)) * (percentreserved) / 100)) 638 639 /* 640 * Determining the size of a file block in the file system. 641 */ 642 #define blksize(fs, ip, lbn) \ 643 (((lbn) >= NDADDR || (ip)->i_size >= lblktosize(fs, (lbn) + 1)) \ 644 ? (fs)->fs_bsize \ 645 : (fragroundup(fs, blkoff(fs, (ip)->i_size)))) 646 647 #define sblksize(fs, size, lbn) \ 648 (((lbn) >= NDADDR || (size) >= ((lbn) + 1) << (fs)->fs_bshift) \ 649 ? (fs)->fs_bsize \ 650 : (fragroundup(fs, blkoff(fs, (size))))) 651 652 653 /* 654 * Number of inodes in a secondary storage block/fragment. 655 */ 656 #define INOPB(fs) ((fs)->fs_inopb) 657 #define INOPF(fs) ((fs)->fs_inopb >> (fs)->fs_fragshift) 658 659 /* 660 * Number of indirects in a file system block. 661 */ 662 #define NINDIR(fs) ((fs)->fs_nindir) 663 664 /* 665 * Apple UFS Label: 666 * We check for this to decide to use APPLEUFS_DIRBLKSIZ 667 */ 668 #define APPLEUFS_LABEL_MAGIC 0x4c41424c /* LABL */ 669 #define APPLEUFS_LABEL_SIZE 1024 670 #define APPLEUFS_LABEL_OFFSET (BBSIZE - APPLEUFS_LABEL_SIZE) /* located at 7k */ 671 #define APPLEUFS_LABEL_VERSION 1 672 #define APPLEUFS_MAX_LABEL_NAME 512 673 674 struct appleufslabel { 675 u_int32_t ul_magic; 676 u_int16_t ul_checksum; 677 u_int16_t ul_unused0; 678 u_int32_t ul_version; 679 u_int32_t ul_time; 680 u_int16_t ul_namelen; 681 u_char ul_name[APPLEUFS_MAX_LABEL_NAME]; /* Warning: may not be null terminated */ 682 u_int16_t ul_unused1; 683 u_int64_t ul_uuid; /* Note this is only 4 byte aligned */ 684 u_char ul_reserved[24]; 685 u_char ul_unused[460]; 686 } __attribute__((__packed__)); 687 688 689 #endif /* !_UFS_FFS_FS_H_ */ 690
Indexes created Fri Oct 03 02:09:57 GMT 2025