fs.h revision 1.63
1/* $NetBSD: fs.h,v 1.63 2013/06/23 07:28:37 dholland 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/* 35 * NOTE: COORDINATE ON-DISK FORMAT CHANGES WITH THE FREEBSD PROJECT. 36 */ 37 38#ifndef _UFS_FFS_FS_H_ 39#define _UFS_FFS_FS_H_ 40 41/* 42 * Each disk drive contains some number of file systems. 43 * A file system consists of a number of cylinder groups. 44 * Each cylinder group has inodes and data. 45 * 46 * A file system is described by its super-block, which in turn 47 * describes the cylinder groups. The super-block is critical 48 * data and is replicated in each cylinder group to protect against 49 * catastrophic loss. This is done at `newfs' time and the critical 50 * super-block data does not change, so the copies need not be 51 * referenced further unless disaster strikes. 52 * 53 * For file system fs, the offsets of the various blocks of interest 54 * are given in the super block as: 55 * [fs->fs_sblkno] Super-block 56 * [fs->fs_cblkno] Cylinder group block 57 * [fs->fs_iblkno] Inode blocks 58 * [fs->fs_dblkno] Data blocks 59 * The beginning of cylinder group cg in fs, is given by 60 * the ``cgbase(fs, cg)'' macro. 61 * 62 * Depending on the architecture and the media, the superblock may 63 * reside in any one of four places. For tiny media where every block 64 * counts, it is placed at the very front of the partition. Historically, 65 * UFS1 placed it 8K from the front to leave room for the disk label and 66 * a small bootstrap. For UFS2 it got moved to 64K from the front to leave 67 * room for the disk label and a bigger bootstrap, and for really piggy 68 * systems we check at 256K from the front if the first three fail. In 69 * all cases the size of the superblock will be SBLOCKSIZE. All values are 70 * given in byte-offset form, so they do not imply a sector size. The 71 * SBLOCKSEARCH specifies the order in which the locations should be searched. 72 * 73 * Unfortunately the UFS2/FFSv2 change was done without adequate consideration 74 * of backward compatibility. In particular 'newfs' for a FFSv2 partition 75 * must overwrite any old FFSv1 superblock at 8k, and preferrably as many 76 * of the alternates as it can find - otherwise attempting to mount on a 77 * system that only supports FFSv1 is likely to succeed!. 78 * For a small FFSv1 filesystem, an old FFSv2 superblock can be left on 79 * the disk, and a system that tries to find an FFSv2 filesystem in preference 80 * to and FFSv1 one (as NetBSD does) can mount the old FFSv2 filesystem. 81 * As a added bonus, the 'first alternate' superblock of a FFSv1 filesystem 82 * with 64k blocks is at 64k - just where the code looks first when playing 83 * 'hunt the superblock'. 84 * 85 * The ffsv2 superblock layout (which might contain an ffsv1 filesystem) 86 * can be detected by checking for sb->fs_old_flags & FS_FLAGS_UPDATED. 87 * This is the default superblock type for NetBSD since ffsv2 support was added. 88 */ 89#define BBSIZE 8192 90#define BBOFF ((off_t)(0)) 91#define BBLOCK ((daddr_t)(0)) 92 93#define SBLOCK_FLOPPY 0 94#define SBLOCK_UFS1 8192 95#define SBLOCK_UFS2 65536 96#define SBLOCK_PIGGY 262144 97#define SBLOCKSIZE 8192 98/* 99 * NB: Do not, under any circumstances, look for an ffsv1 filesystem at 100 * SBLOCK_UFS2. Doing so will find the wrong superblock for filesystems 101 * with a 64k block size. 102 */ 103#define SBLOCKSEARCH \ 104 { SBLOCK_UFS2, SBLOCK_UFS1, SBLOCK_FLOPPY, SBLOCK_PIGGY, -1 } 105 106/* 107 * Max number of fragments per block. This value is NOT tweakable. 108 */ 109#define MAXFRAG 8 110 111 112 113/* 114 * Addresses stored in inodes are capable of addressing fragments 115 * of `blocks'. File system blocks of at most size MAXBSIZE can 116 * be optionally broken into 2, 4, or 8 pieces, each of which is 117 * addressable; these pieces may be DEV_BSIZE, or some multiple of 118 * a DEV_BSIZE unit. 119 * 120 * Large files consist of exclusively large data blocks. To avoid 121 * undue wasted disk space, the last data block of a small file may be 122 * allocated as only as many fragments of a large block as are 123 * necessary. The file system format retains only a single pointer 124 * to such a fragment, which is a piece of a single large block that 125 * has been divided. The size of such a fragment is determinable from 126 * information in the inode, using the ``ffs_blksize(fs, ip, lbn)'' macro. 127 * 128 * The file system records space availability at the fragment level; 129 * to determine block availability, aligned fragments are examined. 130 */ 131 132/* 133 * MINBSIZE is the smallest allowable block size. 134 * In order to insure that it is possible to create files of size 135 * 2^32 with only two levels of indirection, MINBSIZE is set to 4096. 136 * MINBSIZE must be big enough to hold a cylinder group block, 137 * thus changes to (struct cg) must keep its size within MINBSIZE. 138 * Note that super blocks are always of size SBSIZE, 139 * and that both SBSIZE and MAXBSIZE must be >= MINBSIZE. 140 */ 141#define MINBSIZE 4096 142 143/* 144 * The path name on which the file system is mounted is maintained 145 * in fs_fsmnt. MAXMNTLEN defines the amount of space allocated in 146 * the super block for this name. 147 */ 148#define MAXMNTLEN 468 149 150/* 151 * The volume name for this filesystem is maintained in fs_volname. 152 * MAXVOLLEN defines the length of the buffer allocated. 153 * This space used to be part of of fs_fsmnt. 154 */ 155#define MAXVOLLEN 32 156 157/* 158 * There is a 128-byte region in the superblock reserved for in-core 159 * pointers to summary information. Originally this included an array 160 * of pointers to blocks of struct csum; now there are just four 161 * pointers and the remaining space is padded with fs_ocsp[]. 162 * NOCSPTRS determines the size of this padding. One pointer (fs_csp) 163 * is taken away to point to a contiguous array of struct csum for 164 * all cylinder groups; a second (fs_maxcluster) points to an array 165 * of cluster sizes that is computed as cylinder groups are inspected; 166 * the third (fs_contigdirs) points to an array that tracks the 167 * creation of new directories; and the fourth (fs_active) is used 168 * by snapshots. 169 */ 170#define NOCSPTRS ((128 / sizeof(void *)) - 4) 171 172/* 173 * A summary of contiguous blocks of various sizes is maintained 174 * in each cylinder group. Normally this is set by the initial 175 * value of fs_maxcontig. To conserve space, a maximum summary size 176 * is set by FS_MAXCONTIG. 177 */ 178#define FS_MAXCONTIG 16 179 180/* 181 * The maximum number of snapshot nodes that can be associated 182 * with each filesystem. This limit affects only the number of 183 * snapshot files that can be recorded within the superblock so 184 * that they can be found when the filesystem is mounted. However, 185 * maintaining too many will slow the filesystem performance, so 186 * having this limit is a good idea. 187 */ 188#define FSMAXSNAP 20 189 190/* 191 * Used to identify special blocks in snapshots: 192 * 193 * BLK_NOCOPY - A block that was unallocated at the time the snapshot 194 * was taken, hence does not need to be copied when written. 195 * BLK_SNAP - A block held by another snapshot that is not needed by this 196 * snapshot. When the other snapshot is freed, the BLK_SNAP entries 197 * are converted to BLK_NOCOPY. These are needed to allow fsck to 198 * identify blocks that are in use by other snapshots (which are 199 * expunged from this snapshot). 200 */ 201#define BLK_NOCOPY ((daddr_t)(1)) 202#define BLK_SNAP ((daddr_t)(2)) 203 204/* 205 * MINFREE gives the minimum acceptable percentage of file system 206 * blocks which may be free. If the freelist drops below this level 207 * only the superuser may continue to allocate blocks. This may 208 * be set to 0 if no reserve of free blocks is deemed necessary, 209 * however throughput drops by fifty percent if the file system 210 * is run at between 95% and 100% full; thus the minimum default 211 * value of fs_minfree is 5%. However, to get good clustering 212 * performance, 10% is a better choice. This value is used only 213 * when creating a file system and can be overriden from the 214 * command line. By default we choose to optimize for time. 215 */ 216#define MINFREE 5 217#define DEFAULTOPT FS_OPTTIME 218 219/* 220 * Grigoriy Orlov <gluk@ptci.ru> has done some extensive work to fine 221 * tune the layout preferences for directories within a filesystem. 222 * His algorithm can be tuned by adjusting the following parameters 223 * which tell the system the average file size and the average number 224 * of files per directory. These defaults are well selected for typical 225 * filesystems, but may need to be tuned for odd cases like filesystems 226 * being used for squid caches or news spools. 227 */ 228#define AVFILESIZ 16384 /* expected average file size */ 229#define AFPDIR 64 /* expected number of files per directory */ 230 231/* 232 * Per cylinder group information; summarized in blocks allocated 233 * from first cylinder group data blocks. These blocks have to be 234 * read in from fs_csaddr (size fs_cssize) in addition to the 235 * super block. 236 */ 237struct csum { 238 int32_t cs_ndir; /* number of directories */ 239 int32_t cs_nbfree; /* number of free blocks */ 240 int32_t cs_nifree; /* number of free inodes */ 241 int32_t cs_nffree; /* number of free frags */ 242}; 243 244struct csum_total { 245 int64_t cs_ndir; /* number of directories */ 246 int64_t cs_nbfree; /* number of free blocks */ 247 int64_t cs_nifree; /* number of free inodes */ 248 int64_t cs_nffree; /* number of free frags */ 249 int64_t cs_spare[4]; /* future expansion */ 250}; 251 252 253/* 254 * Super block for an FFS file system in memory. 255 */ 256struct fs { 257 int32_t fs_firstfield; /* historic file system linked list, */ 258 int32_t fs_unused_1; /* used for incore super blocks */ 259 int32_t fs_sblkno; /* addr of super-block in filesys */ 260 int32_t fs_cblkno; /* offset of cyl-block in filesys */ 261 int32_t fs_iblkno; /* offset of inode-blocks in filesys */ 262 int32_t fs_dblkno; /* offset of first data after cg */ 263 int32_t fs_old_cgoffset; /* cylinder group offset in cylinder */ 264 int32_t fs_old_cgmask; /* used to calc mod fs_ntrak */ 265 int32_t fs_old_time; /* last time written */ 266 int32_t fs_old_size; /* number of blocks in fs */ 267 int32_t fs_old_dsize; /* number of data blocks in fs */ 268 int32_t fs_ncg; /* number of cylinder groups */ 269 int32_t fs_bsize; /* size of basic blocks in fs */ 270 int32_t fs_fsize; /* size of frag blocks in fs */ 271 int32_t fs_frag; /* number of frags in a block in fs */ 272/* these are configuration parameters */ 273 int32_t fs_minfree; /* minimum percentage of free blocks */ 274 int32_t fs_old_rotdelay; /* num of ms for optimal next block */ 275 int32_t fs_old_rps; /* disk revolutions per second */ 276/* these fields can be computed from the others */ 277 int32_t fs_bmask; /* ``blkoff'' calc of blk offsets */ 278 int32_t fs_fmask; /* ``fragoff'' calc of frag offsets */ 279 int32_t fs_bshift; /* ``lblkno'' calc of logical blkno */ 280 int32_t fs_fshift; /* ``numfrags'' calc number of frags */ 281/* these are configuration parameters */ 282 int32_t fs_maxcontig; /* max number of contiguous blks */ 283 int32_t fs_maxbpg; /* max number of blks per cyl group */ 284/* these fields can be computed from the others */ 285 int32_t fs_fragshift; /* block to frag shift */ 286 int32_t fs_fsbtodb; /* fsbtodb and dbtofsb shift constant */ 287 int32_t fs_sbsize; /* actual size of super block */ 288 int32_t fs_spare1[2]; /* old fs_csmask */ 289 /* old fs_csshift */ 290 int32_t fs_nindir; /* value of FFS_NINDIR */ 291 int32_t fs_inopb; /* value of FFS_INOPB */ 292 int32_t fs_old_nspf; /* value of NSPF */ 293/* yet another configuration parameter */ 294 int32_t fs_optim; /* optimization preference, see below */ 295/* these fields are derived from the hardware */ 296 int32_t fs_old_npsect; /* # sectors/track including spares */ 297 int32_t fs_old_interleave; /* hardware sector interleave */ 298 int32_t fs_old_trackskew; /* sector 0 skew, per track */ 299/* fs_id takes the space of the unused fs_headswitch and fs_trkseek fields */ 300 int32_t fs_id[2]; /* unique file system id */ 301/* sizes determined by number of cylinder groups and their sizes */ 302 int32_t fs_old_csaddr; /* blk addr of cyl grp summary area */ 303 int32_t fs_cssize; /* size of cyl grp summary area */ 304 int32_t fs_cgsize; /* cylinder group size */ 305/* these fields are derived from the hardware */ 306 int32_t fs_spare2; /* old fs_ntrak */ 307 int32_t fs_old_nsect; /* sectors per track */ 308 int32_t fs_old_spc; /* sectors per cylinder */ 309 int32_t fs_old_ncyl; /* cylinders in file system */ 310 int32_t fs_old_cpg; /* cylinders per group */ 311 int32_t fs_ipg; /* inodes per group */ 312 int32_t fs_fpg; /* blocks per group * fs_frag */ 313/* this data must be re-computed after crashes */ 314 struct csum fs_old_cstotal; /* cylinder summary information */ 315/* these fields are cleared at mount time */ 316 int8_t fs_fmod; /* super block modified flag */ 317 uint8_t fs_clean; /* file system is clean flag */ 318 int8_t fs_ronly; /* mounted read-only flag */ 319 uint8_t fs_old_flags; /* see FS_ flags below */ 320 u_char fs_fsmnt[MAXMNTLEN]; /* name mounted on */ 321 u_char fs_volname[MAXVOLLEN]; /* volume name */ 322 uint64_t fs_swuid; /* system-wide uid */ 323 int32_t fs_pad; 324/* these fields retain the current block allocation info */ 325 int32_t fs_cgrotor; /* last cg searched (UNUSED) */ 326 void *fs_ocsp[NOCSPTRS]; /* padding; was list of fs_cs buffers */ 327 u_int8_t *fs_contigdirs; /* # of contiguously allocated dirs */ 328 struct csum *fs_csp; /* cg summary info buffer for fs_cs */ 329 int32_t *fs_maxcluster; /* max cluster in each cyl group */ 330 u_char *fs_active; /* used by snapshots to track fs */ 331 int32_t fs_old_cpc; /* cyl per cycle in postbl */ 332/* this area is otherwise allocated unless fs_old_flags & FS_FLAGS_UPDATED */ 333 int32_t fs_maxbsize; /* maximum blocking factor permitted */ 334 uint8_t fs_journal_version; /* journal format version */ 335 uint8_t fs_journal_location; /* journal location type */ 336 uint8_t fs_journal_reserved[2];/* reserved for future use */ 337 uint32_t fs_journal_flags; /* journal flags */ 338 uint64_t fs_journallocs[4]; /* location info for journal */ 339 uint32_t fs_quota_magic; /* see quota2.h */ 340 uint8_t fs_quota_flags; /* see quota2.h */ 341 uint8_t fs_quota_reserved[3]; 342 uint64_t fs_quotafile[2]; /* pointer to quota inodes */ 343 int64_t fs_sparecon64[9]; /* reserved for future use */ 344 int64_t fs_sblockloc; /* byte offset of standard superblock */ 345 struct csum_total fs_cstotal; /* cylinder summary information */ 346 int64_t fs_time; /* last time written */ 347 int64_t fs_size; /* number of blocks in fs */ 348 int64_t fs_dsize; /* number of data blocks in fs */ 349 int64_t fs_csaddr; /* blk addr of cyl grp summary area */ 350 int64_t fs_pendingblocks; /* blocks in process of being freed */ 351 int32_t fs_pendinginodes; /* inodes in process of being freed */ 352 int32_t fs_snapinum[FSMAXSNAP];/* list of snapshot inode numbers */ 353/* back to stuff that has been around a while */ 354 int32_t fs_avgfilesize; /* expected average file size */ 355 int32_t fs_avgfpdir; /* expected # of files per directory */ 356 int32_t fs_save_cgsize; /* save real cg size to use fs_bsize */ 357 int32_t fs_sparecon32[26]; /* reserved for future constants */ 358 uint32_t fs_flags; /* see FS_ flags below */ 359/* back to stuff that has been around a while (again) */ 360 int32_t fs_contigsumsize; /* size of cluster summary array */ 361 int32_t fs_maxsymlinklen; /* max length of an internal symlink */ 362 int32_t fs_old_inodefmt; /* format of on-disk inodes */ 363 u_int64_t fs_maxfilesize; /* maximum representable file size */ 364 int64_t fs_qbmask; /* ~fs_bmask for use with 64-bit size */ 365 int64_t fs_qfmask; /* ~fs_fmask for use with 64-bit size */ 366 int32_t fs_state; /* validate fs_clean field (UNUSED) */ 367 int32_t fs_old_postblformat; /* format of positional layout tables */ 368 int32_t fs_old_nrpos; /* number of rotational positions */ 369 int32_t fs_spare5[2]; /* old fs_postbloff */ 370 /* old fs_rotbloff */ 371 int32_t fs_magic; /* magic number */ 372}; 373 374#define fs_old_postbloff fs_spare5[0] 375#define fs_old_rotbloff fs_spare5[1] 376#define fs_old_postbl_start fs_maxbsize 377#define fs_old_headswitch fs_id[0] 378#define fs_old_trkseek fs_id[1] 379#define fs_old_csmask fs_spare1[0] 380#define fs_old_csshift fs_spare1[1] 381 382#define FS_42POSTBLFMT -1 /* 4.2BSD rotational table format */ 383#define FS_DYNAMICPOSTBLFMT 1 /* dynamic rotational table format */ 384 385#define old_fs_postbl(fs_, cylno, opostblsave) \ 386 ((((fs_)->fs_old_postblformat == FS_42POSTBLFMT) || \ 387 ((fs_)->fs_old_postbloff == offsetof(struct fs, fs_old_postbl_start))) \ 388 ? ((int16_t *)(opostblsave) + (cylno) * (fs_)->fs_old_nrpos) \ 389 : ((int16_t *)((uint8_t *)(fs_) + \ 390 (fs_)->fs_old_postbloff) + (cylno) * (fs_)->fs_old_nrpos)) 391#define old_fs_rotbl(fs) \ 392 (((fs)->fs_old_postblformat == FS_42POSTBLFMT) \ 393 ? ((uint8_t *)(&(fs)->fs_magic+1)) \ 394 : ((uint8_t *)((uint8_t *)(fs) + (fs)->fs_old_rotbloff))) 395 396/* 397 * File system identification 398 */ 399#define FS_UFS1_MAGIC 0x011954 /* UFS1 fast file system magic number */ 400#define FS_UFS2_MAGIC 0x19540119 /* UFS2 fast file system magic number */ 401#define FS_UFS1_MAGIC_SWAPPED 0x54190100 402#define FS_UFS2_MAGIC_SWAPPED 0x19015419 403#define FS_OKAY 0x7c269d38 /* superblock checksum */ 404#define FS_42INODEFMT -1 /* 4.2BSD inode format */ 405#define FS_44INODEFMT 2 /* 4.4BSD inode format */ 406 407/* 408 * File system clean flags 409 */ 410#define FS_ISCLEAN 0x01 411#define FS_WASCLEAN 0x02 412 413/* 414 * Preference for optimization. 415 */ 416#define FS_OPTTIME 0 /* minimize allocation time */ 417#define FS_OPTSPACE 1 /* minimize disk fragmentation */ 418 419/* 420 * File system flags 421 */ 422#define FS_UNCLEAN 0x001 /* file system not clean at mount (unused) */ 423#define FS_DOSOFTDEP 0x002 /* file system using soft dependencies */ 424#define FS_NEEDSFSCK 0x004 /* needs sync fsck (FreeBSD compat, unused) */ 425#define FS_INDEXDIRS 0x008 /* kernel supports indexed directories */ 426#define FS_ACLS 0x010 /* file system has ACLs enabled */ 427#define FS_MULTILABEL 0x020 /* file system is MAC multi-label */ 428#define FS_GJOURNAL 0x40 /* gjournaled file system */ 429#define FS_FLAGS_UPDATED 0x80 /* flags have been moved to new location */ 430#define FS_DOWAPBL 0x100 /* Write ahead physical block logging */ 431#define FS_DOQUOTA2 0x200 /* in-filesystem quotas */ 432 433/* File system flags that are ok for NetBSD if set in fs_flags */ 434#define FS_KNOWN_FLAGS (FS_DOSOFTDEP | FS_DOWAPBL | FS_DOQUOTA2) 435 436/* 437 * File system internal flags, also in fs_flags. 438 * (Pick highest number to avoid conflicts with others) 439 */ 440#define FS_SWAPPED 0x80000000 /* file system is endian swapped */ 441#define FS_INTERNAL 0x80000000 /* mask for internal flags */ 442 443/* 444 * Macros to access bits in the fs_active array. 445 */ 446#define ACTIVECG_SET(fs, cg) \ 447 do { \ 448 if ((fs)->fs_active != NULL) \ 449 setbit((fs)->fs_active, (cg)); \ 450 } while (/*CONSTCOND*/ 0) 451#define ACTIVECG_CLR(fs, cg) \ 452 do { \ 453 if ((fs)->fs_active != NULL) \ 454 clrbit((fs)->fs_active, (cg)); \ 455 } while (/*CONSTCOND*/ 0) 456#define ACTIVECG_ISSET(fs, cg) \ 457 ((fs)->fs_active != NULL && isset((fs)->fs_active, (cg))) 458 459/* 460 * The size of a cylinder group is calculated by CGSIZE. The maximum size 461 * is limited by the fact that cylinder groups are at most one block. 462 * Its size is derived from the size of the maps maintained in the 463 * cylinder group and the (struct cg) size. 464 */ 465#define CGSIZE_IF(fs, ipg, fpg) \ 466 /* base cg */ (sizeof(struct cg) + sizeof(int32_t) + \ 467 /* old btotoff */ (fs)->fs_old_cpg * sizeof(int32_t) + \ 468 /* old boff */ (fs)->fs_old_cpg * sizeof(u_int16_t) + \ 469 /* inode map */ howmany((ipg), NBBY) + \ 470 /* block map */ howmany((fpg), NBBY) +\ 471 /* if present */ ((fs)->fs_contigsumsize <= 0 ? 0 : \ 472 /* cluster sum */ (fs)->fs_contigsumsize * sizeof(int32_t) + \ 473 /* cluster map */ howmany(fragstoblks(fs, (fpg)), NBBY))) 474 475#define CGSIZE(fs) CGSIZE_IF((fs), (fs)->fs_ipg, (fs)->fs_fpg) 476 477/* 478 * The minimal number of cylinder groups that should be created. 479 */ 480#define MINCYLGRPS 4 481 482 483/* 484 * Convert cylinder group to base address of its global summary info. 485 */ 486#define fs_cs(fs, indx) fs_csp[indx] 487 488/* 489 * Cylinder group block for a file system. 490 */ 491#define CG_MAGIC 0x090255 492struct cg { 493 int32_t cg_firstfield; /* historic cyl groups linked list */ 494 int32_t cg_magic; /* magic number */ 495 int32_t cg_old_time; /* time last written */ 496 int32_t cg_cgx; /* we are the cgx'th cylinder group */ 497 int16_t cg_old_ncyl; /* number of cyl's this cg */ 498 int16_t cg_old_niblk; /* number of inode blocks this cg */ 499 int32_t cg_ndblk; /* number of data blocks this cg */ 500 struct csum cg_cs; /* cylinder summary information */ 501 int32_t cg_rotor; /* position of last used block */ 502 int32_t cg_frotor; /* position of last used frag */ 503 int32_t cg_irotor; /* position of last used inode */ 504 int32_t cg_frsum[MAXFRAG]; /* counts of available frags */ 505 int32_t cg_old_btotoff; /* (int32) block totals per cylinder */ 506 int32_t cg_old_boff; /* (u_int16) free block positions */ 507 int32_t cg_iusedoff; /* (u_int8) used inode map */ 508 int32_t cg_freeoff; /* (u_int8) free block map */ 509 int32_t cg_nextfreeoff; /* (u_int8) next available space */ 510 int32_t cg_clustersumoff; /* (u_int32) counts of avail clusters */ 511 int32_t cg_clusteroff; /* (u_int8) free cluster map */ 512 int32_t cg_nclusterblks; /* number of clusters this cg */ 513 int32_t cg_niblk; /* number of inode blocks this cg */ 514 int32_t cg_initediblk; /* last initialized inode */ 515 int32_t cg_sparecon32[3]; /* reserved for future use */ 516 int64_t cg_time; /* time last written */ 517 int64_t cg_sparecon64[3]; /* reserved for future use */ 518 u_int8_t cg_space[1]; /* space for cylinder group maps */ 519/* actually longer */ 520}; 521 522/* 523 * The following structure is defined 524 * for compatibility with old file systems. 525 */ 526struct ocg { 527 int32_t cg_firstfield; /* historic linked list of cyl groups */ 528 int32_t cg_unused_1; /* used for incore cyl groups */ 529 int32_t cg_time; /* time last written */ 530 int32_t cg_cgx; /* we are the cgx'th cylinder group */ 531 int16_t cg_ncyl; /* number of cyl's this cg */ 532 int16_t cg_niblk; /* number of inode blocks this cg */ 533 int32_t cg_ndblk; /* number of data blocks this cg */ 534 struct csum cg_cs; /* cylinder summary information */ 535 int32_t cg_rotor; /* position of last used block */ 536 int32_t cg_frotor; /* position of last used frag */ 537 int32_t cg_irotor; /* position of last used inode */ 538 int32_t cg_frsum[8]; /* counts of available frags */ 539 int32_t cg_btot[32]; /* block totals per cylinder */ 540 int16_t cg_b[32][8]; /* positions of free blocks */ 541 u_int8_t cg_iused[256]; /* used inode map */ 542 int32_t cg_magic; /* magic number */ 543 u_int8_t cg_free[1]; /* free block map */ 544/* actually longer */ 545}; 546 547 548/* 549 * Macros for access to cylinder group array structures. 550 */ 551#define old_cg_blktot_old(cgp, ns) \ 552 (((struct ocg *)(cgp))->cg_btot) 553#define old_cg_blks_old(fs, cgp, cylno, ns) \ 554 (((struct ocg *)(cgp))->cg_b[cylno]) 555 556#define old_cg_blktot_new(cgp, ns) \ 557 ((int32_t *)((u_int8_t *)(cgp) + \ 558 ufs_rw32((cgp)->cg_old_btotoff, (ns)))) 559#define old_cg_blks_new(fs, cgp, cylno, ns) \ 560 ((int16_t *)((u_int8_t *)(cgp) + \ 561 ufs_rw32((cgp)->cg_old_boff, (ns))) + (cylno) * (fs)->fs_old_nrpos) 562 563#define old_cg_blktot(cgp, ns) \ 564 ((ufs_rw32((cgp)->cg_magic, (ns)) != CG_MAGIC) ? \ 565 old_cg_blktot_old(cgp, ns) : old_cg_blktot_new(cgp, ns)) 566#define old_cg_blks(fs, cgp, cylno, ns) \ 567 ((ufs_rw32((cgp)->cg_magic, (ns)) != CG_MAGIC) ? \ 568 old_cg_blks_old(fs, cgp, cylno, ns) : old_cg_blks_new(fs, cgp, cylno, ns)) 569 570#define cg_inosused_new(cgp, ns) \ 571 ((u_int8_t *)((u_int8_t *)(cgp) + \ 572 ufs_rw32((cgp)->cg_iusedoff, (ns)))) 573#define cg_blksfree_new(cgp, ns) \ 574 ((u_int8_t *)((u_int8_t *)(cgp) + \ 575 ufs_rw32((cgp)->cg_freeoff, (ns)))) 576#define cg_chkmagic_new(cgp, ns) \ 577 (ufs_rw32((cgp)->cg_magic, (ns)) == CG_MAGIC) 578 579#define cg_inosused_old(cgp, ns) \ 580 (((struct ocg *)(cgp))->cg_iused) 581#define cg_blksfree_old(cgp, ns) \ 582 (((struct ocg *)(cgp))->cg_free) 583#define cg_chkmagic_old(cgp, ns) \ 584 (ufs_rw32(((struct ocg *)(cgp))->cg_magic, (ns)) == CG_MAGIC) 585 586#define cg_inosused(cgp, ns) \ 587 ((ufs_rw32((cgp)->cg_magic, (ns)) != CG_MAGIC) ? \ 588 cg_inosused_old(cgp, ns) : cg_inosused_new(cgp, ns)) 589#define cg_blksfree(cgp, ns) \ 590 ((ufs_rw32((cgp)->cg_magic, (ns)) != CG_MAGIC) ? \ 591 cg_blksfree_old(cgp, ns) : cg_blksfree_new(cgp, ns)) 592#define cg_chkmagic(cgp, ns) \ 593 (cg_chkmagic_new(cgp, ns) || cg_chkmagic_old(cgp, ns)) 594 595#define cg_clustersfree(cgp, ns) \ 596 ((u_int8_t *)((u_int8_t *)(cgp) + \ 597 ufs_rw32((cgp)->cg_clusteroff, (ns)))) 598#define cg_clustersum(cgp, ns) \ 599 ((int32_t *)((u_int8_t *)(cgp) + \ 600 ufs_rw32((cgp)->cg_clustersumoff, (ns)))) 601 602 603/* 604 * Turn file system block numbers into disk block addresses. 605 * This maps file system blocks to device size blocks. 606 */ 607#if defined (_KERNEL) 608#define FFS_FSBTODB(fs, b) ((b) << ((fs)->fs_fshift - DEV_BSHIFT)) 609#define FFS_DBTOFSB(fs, b) ((b) >> ((fs)->fs_fshift - DEV_BSHIFT)) 610#else 611#define FFS_FSBTODB(fs, b) ((b) << (fs)->fs_fsbtodb) 612#define FFS_DBTOFSB(fs, b) ((b) >> (fs)->fs_fsbtodb) 613#endif 614 615/* 616 * Cylinder group macros to locate things in cylinder groups. 617 * They calc file system addresses of cylinder group data structures. 618 */ 619#define cgbase(fs, c) (((daddr_t)(fs)->fs_fpg) * (c)) 620#define cgstart_ufs1(fs, c) \ 621 (cgbase(fs, c) + (fs)->fs_old_cgoffset * ((c) & ~((fs)->fs_old_cgmask))) 622#define cgstart_ufs2(fs, c) cgbase((fs), (c)) 623#define cgstart(fs, c) ((fs)->fs_magic == FS_UFS2_MAGIC \ 624 ? cgstart_ufs2((fs), (c)) : cgstart_ufs1((fs), (c))) 625#define cgdmin(fs, c) (cgstart(fs, c) + (fs)->fs_dblkno) /* 1st data */ 626#define cgimin(fs, c) (cgstart(fs, c) + (fs)->fs_iblkno) /* inode blk */ 627#define cgsblock(fs, c) (cgstart(fs, c) + (fs)->fs_sblkno) /* super blk */ 628#define cgtod(fs, c) (cgstart(fs, c) + (fs)->fs_cblkno) /* cg block */ 629 630/* 631 * Macros for handling inode numbers: 632 * inode number to file system block offset. 633 * inode number to cylinder group number. 634 * inode number to file system block address. 635 */ 636#define ino_to_cg(fs, x) ((x) / (fs)->fs_ipg) 637#define ino_to_fsba(fs, x) \ 638 ((daddr_t)(cgimin(fs, ino_to_cg(fs, x)) + \ 639 (blkstofrags((fs), (((x) % (fs)->fs_ipg) / FFS_INOPB(fs)))))) 640#define ino_to_fsbo(fs, x) ((x) % FFS_INOPB(fs)) 641 642/* 643 * Give cylinder group number for a file system block. 644 * Give cylinder group block number for a file system block. 645 */ 646#define dtog(fs, d) ((d) / (fs)->fs_fpg) 647#define dtogd(fs, d) ((d) % (fs)->fs_fpg) 648 649/* 650 * Extract the bits for a block from a map. 651 * Compute the cylinder and rotational position of a cyl block addr. 652 */ 653#define blkmap(fs, map, loc) \ 654 (((map)[(loc) / NBBY] >> ((loc) % NBBY)) & (0xff >> (NBBY - (fs)->fs_frag))) 655#define old_cbtocylno(fs, bno) \ 656 (FFS_FSBTODB(fs, bno) / (fs)->fs_old_spc) 657#define old_cbtorpos(fs, bno) \ 658 ((fs)->fs_old_nrpos <= 1 ? 0 : \ 659 (FFS_FSBTODB(fs, bno) % (fs)->fs_old_spc / (fs)->fs_old_nsect * (fs)->fs_old_trackskew + \ 660 FFS_FSBTODB(fs, bno) % (fs)->fs_old_spc % (fs)->fs_old_nsect * (fs)->fs_old_interleave) % \ 661 (fs)->fs_old_nsect * (fs)->fs_old_nrpos / (fs)->fs_old_npsect) 662 663/* 664 * The following macros optimize certain frequently calculated 665 * quantities by using shifts and masks in place of divisions 666 * modulos and multiplications. 667 */ 668#define ffs_blkoff(fs, loc) /* calculates (loc % fs->fs_bsize) */ \ 669 ((loc) & (fs)->fs_qbmask) 670#define ffs_fragoff(fs, loc) /* calculates (loc % fs->fs_fsize) */ \ 671 ((loc) & (fs)->fs_qfmask) 672#define ffs_lfragtosize(fs, frag) /* calculates ((off_t)frag * fs->fs_fsize) */ \ 673 (((off_t)(frag)) << (fs)->fs_fshift) 674#define ffs_lblktosize(fs, blk) /* calculates ((off_t)blk * fs->fs_bsize) */ \ 675 ((uint64_t)(((off_t)(blk)) << (fs)->fs_bshift)) 676#define ffs_lblkno(fs, loc) /* calculates (loc / fs->fs_bsize) */ \ 677 ((loc) >> (fs)->fs_bshift) 678#define ffs_numfrags(fs, loc) /* calculates (loc / fs->fs_fsize) */ \ 679 ((loc) >> (fs)->fs_fshift) 680#define ffs_blkroundup(fs, size) /* calculates roundup(size, fs->fs_bsize) */ \ 681 (((size) + (fs)->fs_qbmask) & (fs)->fs_bmask) 682#define ffs_fragroundup(fs, size) /* calculates roundup(size, fs->fs_fsize) */ \ 683 (((size) + (fs)->fs_qfmask) & (fs)->fs_fmask) 684#define fragstoblks(fs, frags) /* calculates (frags / fs->fs_frag) */ \ 685 ((frags) >> (fs)->fs_fragshift) 686#define blkstofrags(fs, blks) /* calculates (blks * fs->fs_frag) */ \ 687 ((blks) << (fs)->fs_fragshift) 688#define fragnum(fs, fsb) /* calculates (fsb % fs->fs_frag) */ \ 689 ((fsb) & ((fs)->fs_frag - 1)) 690#define blknum(fs, fsb) /* calculates rounddown(fsb, fs->fs_frag) */ \ 691 ((fsb) &~ ((fs)->fs_frag - 1)) 692 693/* 694 * Determine the number of available frags given a 695 * percentage to hold in reserve. 696 */ 697#define freespace(fs, percentreserved) \ 698 (blkstofrags((fs), (fs)->fs_cstotal.cs_nbfree) + \ 699 (fs)->fs_cstotal.cs_nffree - \ 700 (((off_t)((fs)->fs_dsize)) * (percentreserved) / 100)) 701 702/* 703 * Determining the size of a file block in the file system. 704 */ 705#define ffs_blksize(fs, ip, lbn) \ 706 (((lbn) >= UFS_NDADDR || (ip)->i_size >= ffs_lblktosize(fs, (lbn) + 1)) \ 707 ? (fs)->fs_bsize \ 708 : ((int32_t)ffs_fragroundup(fs, ffs_blkoff(fs, (ip)->i_size)))) 709 710#define ffs_sblksize(fs, size, lbn) \ 711 (((lbn) >= UFS_NDADDR || (size) >= ((lbn) + 1) << (fs)->fs_bshift) \ 712 ? (fs)->fs_bsize \ 713 : ((int32_t)ffs_fragroundup(fs, ffs_blkoff(fs, (uint64_t)(size))))) 714 715 716/* 717 * Number of inodes in a secondary storage block/fragment. 718 */ 719#define FFS_INOPB(fs) ((fs)->fs_inopb) 720#define FFS_INOPF(fs) ((fs)->fs_inopb >> (fs)->fs_fragshift) 721 722/* 723 * Number of indirects in a file system block. 724 */ 725#define FFS_NINDIR(fs) ((fs)->fs_nindir) 726 727/* 728 * Apple UFS Label: 729 * We check for this to decide to use APPLEUFS_DIRBLKSIZ 730 */ 731#define APPLEUFS_LABEL_MAGIC 0x4c41424c /* LABL */ 732#define APPLEUFS_LABEL_SIZE 1024 733#define APPLEUFS_LABEL_OFFSET (BBSIZE - APPLEUFS_LABEL_SIZE) /* located at 7k */ 734#define APPLEUFS_LABEL_VERSION 1 735#define APPLEUFS_MAX_LABEL_NAME 512 736 737struct appleufslabel { 738 u_int32_t ul_magic; 739 u_int16_t ul_checksum; 740 u_int16_t ul_unused0; 741 u_int32_t ul_version; 742 u_int32_t ul_time; 743 u_int16_t ul_namelen; 744 u_char ul_name[APPLEUFS_MAX_LABEL_NAME]; /* Warning: may not be null terminated */ 745 u_int16_t ul_unused1; 746 u_int64_t ul_uuid; /* Note this is only 4 byte aligned */ 747 u_char ul_reserved[24]; 748 u_char ul_unused[460]; 749} __packed; 750 751 752#endif /* !_UFS_FFS_FS_H_ */ 753