1 /* 2 * Copyright (c) 1982, 1986, 1993 3 * The Regents of the University of California. 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 8.13 (Berkeley) 3/21/95 34 * $FreeBSD$ 35 */ 36 37 #ifndef _UFS_FFS_FS_H_ 38 #define _UFS_FFS_FS_H_ 39 40 /* 41 * Each disk drive contains some number of filesystems. 42 * A filesystem consists of a number of cylinder groups. 43 * Each cylinder group has inodes and data. 44 * 45 * A filesystem is described by its super-block, which in turn 46 * describes the cylinder groups. The super-block is critical 47 * data and is replicated in each cylinder group to protect against 48 * catastrophic loss. This is done at `newfs' time and the critical 49 * super-block data does not change, so the copies need not be 50 * referenced further unless disaster strikes. 51 * 52 * For filesystem fs, the offsets of the various blocks of interest 53 * are given in the super block as: 54 * [fs->fs_sblkno] Super-block 55 * [fs->fs_cblkno] Cylinder group block 56 * [fs->fs_iblkno] Inode blocks 57 * [fs->fs_dblkno] Data blocks 58 * The beginning of cylinder group cg in fs, is given by 59 * the ``cgbase(fs, cg)'' macro. 60 * 61 * Depending on the architecture and the media, the superblock may 62 * reside in any one of four places. For tiny media where every block 63 * counts, it is placed at the very front of the partition. Historically, 64 * UFS1 placed it 8K from the front to leave room for the disk label and 65 * a small bootstrap. For UFS2 it got moved to 64K from the front to leave 66 * room for the disk label and a bigger bootstrap, and for really piggy 67 * systems we check at 256K from the front if the first three fail. In 68 * all cases the size of the superblock will be SBLOCKSIZE. All values are 69 * given in byte-offset form, so they do not imply a sector size. The 70 * SBLOCKSEARCH specifies the order in which the locations should be searched. 71 */ 72 #define SBLOCK_FLOPPY 0 73 #define SBLOCK_UFS1 8192 74 #define SBLOCK_UFS2 65536 75 #define SBLOCK_PIGGY 262144 76 #define SBLOCKSIZE 8192 77 #define SBLOCKSEARCH \ 78 { SBLOCK_UFS2, SBLOCK_UFS1, SBLOCK_FLOPPY, SBLOCK_PIGGY, -1 } 79 80 /* 81 * Max number of fragments per block. This value is NOT tweakable. 82 */ 83 #define MAXFRAG 8 84 85 /* 86 * Addresses stored in inodes are capable of addressing fragments 87 * of `blocks'. File system blocks of at most size MAXBSIZE can 88 * be optionally broken into 2, 4, or 8 pieces, each of which is 89 * addressable; these pieces may be DEV_BSIZE, or some multiple of 90 * a DEV_BSIZE unit. 91 * 92 * Large files consist of exclusively large data blocks. To avoid 93 * undue wasted disk space, the last data block of a small file may be 94 * allocated as only as many fragments of a large block as are 95 * necessary. The filesystem format retains only a single pointer 96 * to such a fragment, which is a piece of a single large block that 97 * has been divided. The size of such a fragment is determinable from 98 * information in the inode, using the ``blksize(fs, ip, lbn)'' macro. 99 * 100 * The filesystem records space availability at the fragment level; 101 * to determine block availability, aligned fragments are examined. 102 */ 103 104 /* 105 * MINBSIZE is the smallest allowable block size. 106 * In order to insure that it is possible to create files of size 107 * 2^32 with only two levels of indirection, MINBSIZE is set to 4096. 108 * MINBSIZE must be big enough to hold a cylinder group block, 109 * thus changes to (struct cg) must keep its size within MINBSIZE. 110 * Note that super blocks are always of size SBSIZE, 111 * and that both SBSIZE and MAXBSIZE must be >= MINBSIZE. 112 */ 113 #define MINBSIZE 4096 114 115 /* 116 * The path name on which the filesystem is mounted is maintained 117 * in fs_fsmnt. MAXMNTLEN defines the amount of space allocated in 118 * the super block for this name. 119 */ 120 #define MAXMNTLEN 512 121 122 /* 123 * There is a 128-byte region in the superblock reserved for in-core 124 * pointers to summary information. Originally this included an array 125 * of pointers to blocks of struct csum; now there are just a few 126 * pointers and the remaining space is padded with fs_ocsp[]. 127 * 128 * NOCSPTRS determines the size of this padding. One pointer (fs_csp) 129 * is taken away to point to a contiguous array of struct csum for 130 * all cylinder groups; a second (fs_maxcluster) points to an array 131 * of cluster sizes that is computed as cylinder groups are inspected, 132 * and the third points to an array that tracks the creation of new 133 * directories. A fourth pointer, fs_active, is used when creating 134 * snapshots; it points to a bitmap of cylinder groups for which the 135 * free-block bitmap has changed since the snapshot operation began. 136 */ 137 #define NOCSPTRS ((128 / sizeof(void *)) - 4) 138 139 /* 140 * A summary of contiguous blocks of various sizes is maintained 141 * in each cylinder group. Normally this is set by the initial 142 * value of fs_maxcontig. To conserve space, a maximum summary size 143 * is set by FS_MAXCONTIG. 144 */ 145 #define FS_MAXCONTIG 16 146 147 /* 148 * MINFREE gives the minimum acceptable percentage of filesystem 149 * blocks which may be free. If the freelist drops below this level 150 * only the superuser may continue to allocate blocks. This may 151 * be set to 0 if no reserve of free blocks is deemed necessary, 152 * however throughput drops by fifty percent if the filesystem 153 * is run at between 95% and 100% full; thus the minimum default 154 * value of fs_minfree is 5%. However, to get good clustering 155 * performance, 10% is a better choice. hence we use 10% as our 156 * default value. With 10% free space, fragmentation is not a 157 * problem, so we choose to optimize for time. 158 */ 159 #define MINFREE 8 160 #define DEFAULTOPT FS_OPTTIME 161 162 /* 163 * Grigoriy Orlov <gluk@ptci.ru> has done some extensive work to fine 164 * tune the layout preferences for directories within a filesystem. 165 * His algorithm can be tuned by adjusting the following parameters 166 * which tell the system the average file size and the average number 167 * of files per directory. These defaults are well selected for typical 168 * filesystems, but may need to be tuned for odd cases like filesystems 169 * being used for sqiud caches or news spools. 170 */ 171 #define AVFILESIZ 16384 /* expected average file size */ 172 #define AFPDIR 64 /* expected number of files per directory */ 173 174 /* 175 * The maximum number of snapshot nodes that can be associated 176 * with each filesystem. This limit affects only the number of 177 * snapshot files that can be recorded within the superblock so 178 * that they can be found when the filesystem is mounted. However, 179 * maintaining too many will slow the filesystem performance, so 180 * having this limit is a good idea. 181 */ 182 #define FSMAXSNAP 20 183 184 /* 185 * Used to identify special blocks in snapshots: 186 * 187 * BLK_NOCOPY - A block that was unallocated at the time the snapshot 188 * was taken, hence does not need to be copied when written. 189 * BLK_SNAP - A block held by another snapshot that is not needed by this 190 * snapshot. When the other snapshot is freed, the BLK_SNAP entries 191 * are converted to BLK_NOCOPY. These are needed to allow fsck to 192 * identify blocks that are in use by other snapshots (which are 193 * expunged from this snapshot). 194 */ 195 #define BLK_NOCOPY ((ufs2_daddr_t)(1)) 196 #define BLK_SNAP ((ufs2_daddr_t)(2)) 197 198 /* 199 * Sysctl values for the fast filesystem. 200 */ 201 #define FFS_ADJ_REFCNT 1 /* adjust inode reference count */ 202 #define FFS_ADJ_BLKCNT 2 /* adjust inode used block count */ 203 #define FFS_BLK_FREE 3 /* free range of blocks in map */ 204 #define FFS_DIR_FREE 4 /* free specified dir inodes in map */ 205 #define FFS_FILE_FREE 5 /* free specified file inodes in map */ 206 #define FFS_SET_FLAGS 6 /* set filesystem flags */ 207 #define FFS_MAXID 7 /* number of valid ffs ids */ 208 209 /* 210 * Command structure passed in to the filesystem to adjust filesystem values. 211 */ 212 #define FFS_CMD_VERSION 0x19790518 /* version ID */ 213 struct fsck_cmd { 214 int32_t version; /* version of command structure */ 215 int32_t handle; /* reference to filesystem to be changed */ 216 int64_t value; /* inode or block number to be affected */ 217 int64_t size; /* amount or range to be adjusted */ 218 int64_t spare; /* reserved for future use */ 219 }; 220 221 /* 222 * Per cylinder group information; summarized in blocks allocated 223 * from first cylinder group data blocks. These blocks have to be 224 * read in from fs_csaddr (size fs_cssize) in addition to the 225 * super block. 226 */ 227 struct csum { 228 int32_t cs_ndir; /* number of directories */ 229 int32_t cs_nbfree; /* number of free blocks */ 230 int32_t cs_nifree; /* number of free inodes */ 231 int32_t cs_nffree; /* number of free frags */ 232 }; 233 struct csum_total { 234 int64_t cs_ndir; /* number of directories */ 235 int64_t cs_nbfree; /* number of free blocks */ 236 int64_t cs_nifree; /* number of free inodes */ 237 int64_t cs_nffree; /* number of free frags */ 238 int64_t cs_numclusters; /* number of free clusters */ 239 int64_t cs_spare[3]; /* future expansion */ 240 }; 241 242 /* 243 * Super block for an FFS filesystem. 244 */ 245 struct fs { 246 int32_t fs_firstfield; /* historic filesystem linked list, */ 247 int32_t fs_unused_1; /* used for incore super blocks */ 248 int32_t fs_sblkno; /* offset of super-block in filesys */ 249 int32_t fs_cblkno; /* offset of cyl-block in filesys */ 250 int32_t fs_iblkno; /* offset of inode-blocks in filesys */ 251 int32_t fs_dblkno; /* offset of first data after cg */ 252 int32_t fs_old_cgoffset; /* cylinder group offset in cylinder */ 253 int32_t fs_old_cgmask; /* used to calc mod fs_ntrak */ 254 int32_t fs_old_time; /* last time written */ 255 int32_t fs_old_size; /* number of blocks in fs */ 256 int32_t fs_old_dsize; /* number of data blocks in fs */ 257 int32_t fs_ncg; /* number of cylinder groups */ 258 int32_t fs_bsize; /* size of basic blocks in fs */ 259 int32_t fs_fsize; /* size of frag blocks in fs */ 260 int32_t fs_frag; /* number of frags in a block in fs */ 261 /* these are configuration parameters */ 262 int32_t fs_minfree; /* minimum percentage of free blocks */ 263 int32_t fs_old_rotdelay; /* num of ms for optimal next block */ 264 int32_t fs_old_rps; /* disk revolutions per second */ 265 /* these fields can be computed from the others */ 266 int32_t fs_bmask; /* ``blkoff'' calc of blk offsets */ 267 int32_t fs_fmask; /* ``fragoff'' calc of frag offsets */ 268 int32_t fs_bshift; /* ``lblkno'' calc of logical blkno */ 269 int32_t fs_fshift; /* ``numfrags'' calc number of frags */ 270 /* these are configuration parameters */ 271 int32_t fs_maxcontig; /* max number of contiguous blks */ 272 int32_t fs_maxbpg; /* max number of blks per cyl group */ 273 /* these fields can be computed from the others */ 274 int32_t fs_fragshift; /* block to frag shift */ 275 int32_t fs_fsbtodb; /* fsbtodb and dbtofsb shift constant */ 276 int32_t fs_sbsize; /* actual size of super block */ 277 int32_t fs_spare1[2]; /* old fs_csmask */ 278 /* old fs_csshift */ 279 int32_t fs_nindir; /* value of NINDIR */ 280 int32_t fs_inopb; /* value of INOPB */ 281 int32_t fs_old_nspf; /* value of NSPF */ 282 /* yet another configuration parameter */ 283 int32_t fs_optim; /* optimization preference, see below */ 284 int32_t fs_old_npsect; /* # sectors/track including spares */ 285 int32_t fs_old_interleave; /* hardware sector interleave */ 286 int32_t fs_old_trackskew; /* sector 0 skew, per track */ 287 int32_t fs_id[2]; /* unique filesystem id */ 288 /* sizes determined by number of cylinder groups and their sizes */ 289 int32_t fs_old_csaddr; /* blk addr of cyl grp summary area */ 290 int32_t fs_cssize; /* size of cyl grp summary area */ 291 int32_t fs_cgsize; /* cylinder group size */ 292 int32_t fs_spare2; /* old fs_ntrak */ 293 int32_t fs_old_nsect; /* sectors per track */ 294 int32_t fs_old_spc; /* sectors per cylinder */ 295 int32_t fs_old_ncyl; /* cylinders in filesystem */ 296 int32_t fs_old_cpg; /* cylinders per group */ 297 int32_t fs_ipg; /* inodes per group */ 298 int32_t fs_fpg; /* blocks per group * fs_frag */ 299 /* this data must be re-computed after crashes */ 300 struct csum fs_old_cstotal; /* cylinder summary information */ 301 /* these fields are cleared at mount time */ 302 int8_t fs_fmod; /* super block modified flag */ 303 int8_t fs_clean; /* filesystem is clean flag */ 304 int8_t fs_ronly; /* mounted read-only flag */ 305 int8_t fs_old_flags; /* old FS_ flags */ 306 u_char fs_fsmnt[MAXMNTLEN]; /* name mounted on */ 307 /* these fields retain the current block allocation info */ 308 int32_t fs_cgrotor; /* last cg searched */ 309 void *fs_ocsp[NOCSPTRS]; /* padding; was list of fs_cs buffers */ 310 u_int8_t *fs_contigdirs; /* # of contiguously allocated dirs */ 311 struct csum *fs_csp; /* cg summary info buffer for fs_cs */ 312 int32_t *fs_maxcluster; /* max cluster in each cyl group */ 313 u_int *fs_active; /* used by snapshots to track fs */ 314 int32_t fs_old_cpc; /* cyl per cycle in postbl */ 315 int32_t fs_maxbsize; /* maximum blocking factor permitted */ 316 int64_t fs_sparecon64[17]; /* old rotation block list head */ 317 int64_t fs_sblockloc; /* byte offset of standard superblock */ 318 struct csum_total fs_cstotal; /* cylinder summary information */ 319 ufs_time_t fs_time; /* last time written */ 320 int64_t fs_size; /* number of blocks in fs */ 321 int64_t fs_dsize; /* number of data blocks in fs */ 322 ufs2_daddr_t fs_csaddr; /* blk addr of cyl grp summary area */ 323 int64_t fs_pendingblocks; /* blocks in process of being freed */ 324 int32_t fs_pendinginodes; /* inodes in process of being freed */ 325 int32_t fs_snapinum[FSMAXSNAP];/* list of snapshot inode numbers */ 326 int32_t fs_avgfilesize; /* expected average file size */ 327 int32_t fs_avgfpdir; /* expected # of files per directory */ 328 int32_t fs_save_cgsize; /* save real cg size to use fs_bsize */ 329 int32_t fs_sparecon32[26]; /* reserved for future constants */ 330 int32_t fs_flags; /* see FS_ flags below */ 331 int32_t fs_contigsumsize; /* size of cluster summary array */ 332 int32_t fs_maxsymlinklen; /* max length of an internal symlink */ 333 int32_t fs_old_inodefmt; /* format of on-disk inodes */ 334 u_int64_t fs_maxfilesize; /* maximum representable file size */ 335 int64_t fs_qbmask; /* ~fs_bmask for use with 64-bit size */ 336 int64_t fs_qfmask; /* ~fs_fmask for use with 64-bit size */ 337 int32_t fs_state; /* validate fs_clean field */ 338 int32_t fs_old_postblformat; /* format of positional layout tables */ 339 int32_t fs_old_nrpos; /* number of rotational positions */ 340 int32_t fs_spare5[2]; /* old fs_postbloff */ 341 /* old fs_rotbloff */ 342 int32_t fs_magic; /* magic number */ 343 }; 344 345 /* 346 * Filesystem identification 347 */ 348 #define FS_UFS1_MAGIC 0x011954 /* UFS1 fast filesystem magic number */ 349 #define FS_UFS2_MAGIC 0x19540119 /* UFS2 fast filesystem magic number */ 350 #define FS_OKAY 0x7c269d38 /* superblock checksum */ 351 #define FS_42INODEFMT -1 /* 4.2BSD inode format */ 352 #define FS_44INODEFMT 2 /* 4.4BSD inode format */ 353 354 /* 355 * Preference for optimization. 356 */ 357 #define FS_OPTTIME 0 /* minimize allocation time */ 358 #define FS_OPTSPACE 1 /* minimize disk fragmentation */ 359 360 /* 361 * Filesystem flags. 362 * 363 * The FS_UNCLEAN flag is set by the kernel when the filesystem was 364 * mounted with fs_clean set to zero. The FS_DOSOFTDEP flag indicates 365 * that the filesystem should be managed by the soft updates code. 366 * Note that the FS_NEEDSFSCK flag is set and cleared only by the 367 * fsck utility. It is set when background fsck finds an unexpected 368 * inconsistency which requires a traditional foreground fsck to be 369 * run. Such inconsistencies should only be found after an uncorrectable 370 * disk error. A foreground fsck will clear the FS_NEEDSFSCK flag when 371 * it has successfully cleaned up the filesystem. The kernel uses this 372 * flag to enforce that inconsistent filesystems be mounted read-only. 373 * The FS_INDEXDIRS flag when set indicates that the kernel maintains 374 * on-disk auxiliary indexes (such as B-trees) for speeding directory 375 * accesses. Kernels that do not support auxiliary indicies clear the 376 * flag to indicate that the indicies need to be rebuilt (by fsck) before 377 * they can be used. 378 * 379 * FS_ACLS indicates that ACLs are administratively enabled for the 380 * file system, so they should be loaded from extended attributes, 381 * observed for access control purposes, and be administered by object 382 * owners. FS_MULTILABEL indicates that the TrustedBSD MAC Framework 383 * should attempt to back MAC labels into extended attributes on the 384 * file system rather than maintain a single mount label for all 385 * objects. 386 */ 387 #define FS_UNCLEAN 0x01 /* filesystem not clean at mount */ 388 #define FS_DOSOFTDEP 0x02 /* filesystem using soft dependencies */ 389 #define FS_NEEDSFSCK 0x04 /* filesystem needs sync fsck before mount */ 390 #define FS_INDEXDIRS 0x08 /* kernel supports indexed directories */ 391 #define FS_ACLS 0x10 /* file system has ACLs enabled */ 392 #define FS_MULTILABEL 0x20 /* file system is MAC multi-label */ 393 #define FS_FLAGS_UPDATED 0x80 /* flags have been moved to new location */ 394 395 /* 396 * Macros to access bits in the fs_active array. 397 */ 398 #define ACTIVECGNUM(fs, cg) ((fs)->fs_active[(cg) / (NBBY * sizeof(int))]) 399 #define ACTIVECGOFF(cg) (1 << ((cg) % (NBBY * sizeof(int)))) 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(fs) \ 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((fs)->fs_ipg, NBBY) + \ 412 /* block map */ howmany((fs)->fs_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, (fs)->fs_fpg), NBBY))) 416 417 /* 418 * The minimal number of cylinder groups that should be created. 419 */ 420 #define MINCYLGRPS 4 421 422 /* 423 * Convert cylinder group to base address of its global summary info. 424 */ 425 #define fs_cs(fs, indx) fs_csp[indx] 426 427 /* 428 * Cylinder group block for a filesystem. 429 */ 430 #define CG_MAGIC 0x090255 431 struct cg { 432 int32_t cg_firstfield; /* historic cyl groups linked list */ 433 int32_t cg_magic; /* magic number */ 434 int32_t cg_old_time; /* time last written */ 435 int32_t cg_cgx; /* we are the cgx'th cylinder group */ 436 int16_t cg_old_ncyl; /* number of cyl's this cg */ 437 int16_t cg_old_niblk; /* number of inode blocks this cg */ 438 int32_t cg_ndblk; /* number of data blocks this cg */ 439 struct csum cg_cs; /* cylinder summary information */ 440 int32_t cg_rotor; /* position of last used block */ 441 int32_t cg_frotor; /* position of last used frag */ 442 int32_t cg_irotor; /* position of last used inode */ 443 int32_t cg_frsum[MAXFRAG]; /* counts of available frags */ 444 int32_t cg_old_btotoff; /* (int32) block totals per cylinder */ 445 int32_t cg_old_boff; /* (u_int16) free block positions */ 446 int32_t cg_iusedoff; /* (u_int8) used inode map */ 447 int32_t cg_freeoff; /* (u_int8) free block map */ 448 int32_t cg_nextfreeoff; /* (u_int8) next available space */ 449 int32_t cg_clustersumoff; /* (u_int32) counts of avail clusters */ 450 int32_t cg_clusteroff; /* (u_int8) free cluster map */ 451 int32_t cg_nclusterblks; /* number of clusters this cg */ 452 int32_t cg_niblk; /* number of inode blocks this cg */ 453 int32_t cg_initediblk; /* last initialized inode */ 454 int32_t cg_sparecon32[3]; /* reserved for future use */ 455 ufs_time_t cg_time; /* time last written */ 456 int64_t cg_sparecon64[3]; /* reserved for future use */ 457 u_int8_t cg_space[1]; /* space for cylinder group maps */ 458 /* actually longer */ 459 }; 460 461 /* 462 * Macros for access to cylinder group array structures 463 */ 464 #define cg_chkmagic(cgp) ((cgp)->cg_magic == CG_MAGIC) 465 #define cg_inosused(cgp) \ 466 ((u_int8_t *)((u_int8_t *)(cgp) + (cgp)->cg_iusedoff)) 467 #define cg_blksfree(cgp) \ 468 ((u_int8_t *)((u_int8_t *)(cgp) + (cgp)->cg_freeoff)) 469 #define cg_clustersfree(cgp) \ 470 ((u_int8_t *)((u_int8_t *)(cgp) + (cgp)->cg_clusteroff)) 471 #define cg_clustersum(cgp) \ 472 ((int32_t *)((u_int8_t *)(cgp) + (cgp)->cg_clustersumoff)) 473 474 /* 475 * Turn filesystem block numbers into disk block addresses. 476 * This maps filesystem blocks to device size blocks. 477 */ 478 #define fsbtodb(fs, b) ((b) << (fs)->fs_fsbtodb) 479 #define dbtofsb(fs, b) ((b) >> (fs)->fs_fsbtodb) 480 481 /* 482 * Cylinder group macros to locate things in cylinder groups. 483 * They calc filesystem addresses of cylinder group data structures. 484 */ 485 #define cgbase(fs, c) ((ufs2_daddr_t)((fs)->fs_fpg * (c))) 486 #define cgdmin(fs, c) (cgstart(fs, c) + (fs)->fs_dblkno) /* 1st data */ 487 #define cgimin(fs, c) (cgstart(fs, c) + (fs)->fs_iblkno) /* inode blk */ 488 #define cgsblock(fs, c) (cgstart(fs, c) + (fs)->fs_sblkno) /* super blk */ 489 #define cgtod(fs, c) (cgstart(fs, c) + (fs)->fs_cblkno) /* cg block */ 490 #define cgstart(fs, c) \ 491 ((fs)->fs_magic == FS_UFS2_MAGIC ? cgbase(fs, c) : \ 492 (cgbase(fs, c) + (fs)->fs_old_cgoffset * ((c) & ~((fs)->fs_old_cgmask)))) 493 494 /* 495 * Macros for handling inode numbers: 496 * inode number to filesystem block offset. 497 * inode number to cylinder group number. 498 * inode number to filesystem block address. 499 */ 500 #define ino_to_cg(fs, x) ((x) / (fs)->fs_ipg) 501 #define ino_to_fsba(fs, x) \ 502 ((ufs2_daddr_t)(cgimin(fs, ino_to_cg(fs, x)) + \ 503 (blkstofrags((fs), (((x) % (fs)->fs_ipg) / INOPB(fs)))))) 504 #define ino_to_fsbo(fs, x) ((x) % INOPB(fs)) 505 506 /* 507 * Give cylinder group number for a filesystem block. 508 * Give cylinder group block number for a filesystem block. 509 */ 510 #define dtog(fs, d) ((d) / (fs)->fs_fpg) 511 #define dtogd(fs, d) ((d) % (fs)->fs_fpg) 512 513 /* 514 * Extract the bits for a block from a map. 515 * Compute the cylinder and rotational position of a cyl block addr. 516 */ 517 #define blkmap(fs, map, loc) \ 518 (((map)[(loc) / NBBY] >> ((loc) % NBBY)) & (0xff >> (NBBY - (fs)->fs_frag))) 519 520 /* 521 * The following macros optimize certain frequently calculated 522 * quantities by using shifts and masks in place of divisions 523 * modulos and multiplications. 524 */ 525 #define blkoff(fs, loc) /* calculates (loc % fs->fs_bsize) */ \ 526 ((loc) & (fs)->fs_qbmask) 527 #define fragoff(fs, loc) /* calculates (loc % fs->fs_fsize) */ \ 528 ((loc) & (fs)->fs_qfmask) 529 #define lfragtosize(fs, frag) /* calculates ((off_t)frag * fs->fs_fsize) */ \ 530 ((off_t)(frag) << (fs)->fs_fshift) 531 #define lblktosize(fs, blk) /* calculates ((off_t)blk * fs->fs_bsize) */ \ 532 ((off_t)(blk) << (fs)->fs_bshift) 533 /* Use this only when `blk' is known to be small, e.g., < NDADDR. */ 534 #define smalllblktosize(fs, blk) /* calculates (blk * fs->fs_bsize) */ \ 535 ((blk) << (fs)->fs_bshift) 536 #define lblkno(fs, loc) /* calculates (loc / fs->fs_bsize) */ \ 537 ((loc) >> (fs)->fs_bshift) 538 #define numfrags(fs, loc) /* calculates (loc / fs->fs_fsize) */ \ 539 ((loc) >> (fs)->fs_fshift) 540 #define blkroundup(fs, size) /* calculates roundup(size, fs->fs_bsize) */ \ 541 (((size) + (fs)->fs_qbmask) & (fs)->fs_bmask) 542 #define fragroundup(fs, size) /* calculates roundup(size, fs->fs_fsize) */ \ 543 (((size) + (fs)->fs_qfmask) & (fs)->fs_fmask) 544 #define fragstoblks(fs, frags) /* calculates (frags / fs->fs_frag) */ \ 545 ((frags) >> (fs)->fs_fragshift) 546 #define blkstofrags(fs, blks) /* calculates (blks * fs->fs_frag) */ \ 547 ((blks) << (fs)->fs_fragshift) 548 #define fragnum(fs, fsb) /* calculates (fsb % fs->fs_frag) */ \ 549 ((fsb) & ((fs)->fs_frag - 1)) 550 #define blknum(fs, fsb) /* calculates rounddown(fsb, fs->fs_frag) */ \ 551 ((fsb) &~ ((fs)->fs_frag - 1)) 552 553 /* 554 * Determine the number of available frags given a 555 * percentage to hold in reserve. 556 */ 557 #define freespace(fs, percentreserved) \ 558 (blkstofrags((fs), (fs)->fs_cstotal.cs_nbfree) + \ 559 (fs)->fs_cstotal.cs_nffree - \ 560 ((off_t)((fs)->fs_dsize) * (percentreserved) / 100)) 561 562 /* 563 * Determining the size of a file block in the filesystem. 564 */ 565 #define blksize(fs, ip, lbn) \ 566 (((lbn) >= NDADDR || (ip)->i_size >= smalllblktosize(fs, (lbn) + 1)) \ 567 ? (fs)->fs_bsize \ 568 : (fragroundup(fs, blkoff(fs, (ip)->i_size)))) 569 #define sblksize(fs, size, lbn) \ 570 (((lbn) >= NDADDR || (size) >= ((lbn) + 1) << (fs)->fs_bshift) \ 571 ? (fs)->fs_bsize \ 572 : (fragroundup(fs, blkoff(fs, (size))))) 573 574 575 /* 576 * Number of inodes in a secondary storage block/fragment. 577 */ 578 #define INOPB(fs) ((fs)->fs_inopb) 579 #define INOPF(fs) ((fs)->fs_inopb >> (fs)->fs_fragshift) 580 581 /* 582 * Number of indirects in a filesystem block. 583 */ 584 #define NINDIR(fs) ((fs)->fs_nindir) 585 586 extern int inside[], around[]; 587 extern u_char *fragtbl[]; 588 589 #endif 590