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. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * @(#)fs.h 8.13 (Berkeley) 3/21/95 30 * $FreeBSD$ 31 */ 32 33 #ifndef _UFS_FFS_FS_H_ 34 #define _UFS_FFS_FS_H_ 35 36 #include <sys/mount.h> 37 #include <ufs/ufs/dinode.h> 38 39 /* 40 * Each disk drive contains some number of filesystems. 41 * A filesystem consists of a number of cylinder groups. 42 * Each cylinder group has inodes and data. 43 * 44 * A filesystem is described by its super-block, which in turn 45 * describes the cylinder groups. The super-block is critical 46 * data and is replicated in each cylinder group to protect against 47 * catastrophic loss. This is done at `newfs' time and the critical 48 * super-block data does not change, so the copies need not be 49 * referenced further unless disaster strikes. 50 * 51 * For filesystem fs, the offsets of the various blocks of interest 52 * are given in the super block as: 53 * [fs->fs_sblkno] Super-block 54 * [fs->fs_cblkno] Cylinder group block 55 * [fs->fs_iblkno] Inode blocks 56 * [fs->fs_dblkno] Data blocks 57 * The beginning of cylinder group cg in fs, is given by 58 * the ``cgbase(fs, cg)'' macro. 59 * 60 * Depending on the architecture and the media, the superblock may 61 * reside in any one of four places. For tiny media where every block 62 * counts, it is placed at the very front of the partition. Historically, 63 * UFS1 placed it 8K from the front to leave room for the disk label and 64 * a small bootstrap. For UFS2 it got moved to 64K from the front to leave 65 * room for the disk label and a bigger bootstrap, and for really piggy 66 * systems we check at 256K from the front if the first three fail. In 67 * all cases the size of the superblock will be SBLOCKSIZE. All values are 68 * given in byte-offset form, so they do not imply a sector size. The 69 * SBLOCKSEARCH specifies the order in which the locations should be searched. 70 */ 71 #define SBLOCK_FLOPPY 0 72 #define SBLOCK_UFS1 8192 73 #define SBLOCK_UFS2 65536 74 #define SBLOCK_PIGGY 262144 75 #define SBLOCKSIZE 8192 76 #define SBLOCKSEARCH \ 77 { SBLOCK_UFS2, SBLOCK_UFS1, SBLOCK_FLOPPY, SBLOCK_PIGGY, -1 } 78 79 /* 80 * Max number of fragments per block. This value is NOT tweakable. 81 */ 82 #define MAXFRAG 8 83 84 /* 85 * Addresses stored in inodes are capable of addressing fragments 86 * of `blocks'. File system blocks of at most size MAXBSIZE can 87 * be optionally broken into 2, 4, or 8 pieces, each of which is 88 * addressable; these pieces may be DEV_BSIZE, or some multiple of 89 * a DEV_BSIZE unit. 90 * 91 * Large files consist of exclusively large data blocks. To avoid 92 * undue wasted disk space, the last data block of a small file may be 93 * allocated as only as many fragments of a large block as are 94 * necessary. The filesystem format retains only a single pointer 95 * to such a fragment, which is a piece of a single large block that 96 * has been divided. The size of such a fragment is determinable from 97 * information in the inode, using the ``blksize(fs, ip, lbn)'' macro. 98 * 99 * The filesystem records space availability at the fragment level; 100 * to determine block availability, aligned fragments are examined. 101 */ 102 103 /* 104 * MINBSIZE is the smallest allowable block size. 105 * In order to insure that it is possible to create files of size 106 * 2^32 with only two levels of indirection, MINBSIZE is set to 4096. 107 * MINBSIZE must be big enough to hold a cylinder group block, 108 * thus changes to (struct cg) must keep its size within MINBSIZE. 109 * Note that super blocks are always of size SBLOCKSIZE, 110 * and that both SBLOCKSIZE and MAXBSIZE must be >= MINBSIZE. 111 */ 112 #define MINBSIZE 4096 113 114 /* 115 * The path name on which the filesystem is mounted is maintained 116 * in fs_fsmnt. MAXMNTLEN defines the amount of space allocated in 117 * the super block for this name. 118 */ 119 #define MAXMNTLEN 468 120 121 /* 122 * The volume name for this filesystem is maintained in fs_volname. 123 * MAXVOLLEN defines the length of the buffer allocated. 124 */ 125 #define MAXVOLLEN 32 126 127 /* 128 * There is a 128-byte region in the superblock reserved for in-core 129 * pointers to summary information. Originally this included an array 130 * of pointers to blocks of struct csum; now there are just a few 131 * pointers and the remaining space is padded with fs_ocsp[]. 132 * 133 * NOCSPTRS determines the size of this padding. One pointer (fs_csp) 134 * is taken away to point to a contiguous array of struct csum for 135 * all cylinder groups; a second (fs_maxcluster) points to an array 136 * of cluster sizes that is computed as cylinder groups are inspected, 137 * and the third points to an array that tracks the creation of new 138 * directories. A fourth pointer, fs_active, is used when creating 139 * snapshots; it points to a bitmap of cylinder groups for which the 140 * free-block bitmap has changed since the snapshot operation began. 141 */ 142 #define NOCSPTRS ((128 / sizeof(void *)) - 4) 143 144 /* 145 * A summary of contiguous blocks of various sizes is maintained 146 * in each cylinder group. Normally this is set by the initial 147 * value of fs_maxcontig. To conserve space, a maximum summary size 148 * is set by FS_MAXCONTIG. 149 */ 150 #define FS_MAXCONTIG 16 151 152 /* 153 * MINFREE gives the minimum acceptable percentage of filesystem 154 * blocks which may be free. If the freelist drops below this level 155 * only the superuser may continue to allocate blocks. This may 156 * be set to 0 if no reserve of free blocks is deemed necessary, 157 * however throughput drops by fifty percent if the filesystem 158 * is run at between 95% and 100% full; thus the minimum default 159 * value of fs_minfree is 5%. However, to get good clustering 160 * performance, 10% is a better choice. hence we use 10% as our 161 * default value. With 10% free space, fragmentation is not a 162 * problem, so we choose to optimize for time. 163 */ 164 #define MINFREE 8 165 #define DEFAULTOPT FS_OPTTIME 166 167 /* 168 * Grigoriy Orlov <gluk@ptci.ru> has done some extensive work to fine 169 * tune the layout preferences for directories within a filesystem. 170 * His algorithm can be tuned by adjusting the following parameters 171 * which tell the system the average file size and the average number 172 * of files per directory. These defaults are well selected for typical 173 * filesystems, but may need to be tuned for odd cases like filesystems 174 * being used for squid caches or news spools. 175 */ 176 #define AVFILESIZ 16384 /* expected average file size */ 177 #define AFPDIR 64 /* expected number of files per directory */ 178 179 /* 180 * The maximum number of snapshot nodes that can be associated 181 * with each filesystem. This limit affects only the number of 182 * snapshot files that can be recorded within the superblock so 183 * that they can be found when the filesystem is mounted. However, 184 * maintaining too many will slow the filesystem performance, so 185 * having this limit is a good idea. 186 */ 187 #define FSMAXSNAP 20 188 189 /* 190 * Used to identify special blocks in snapshots: 191 * 192 * BLK_NOCOPY - A block that was unallocated at the time the snapshot 193 * was taken, hence does not need to be copied when written. 194 * BLK_SNAP - A block held by another snapshot that is not needed by this 195 * snapshot. When the other snapshot is freed, the BLK_SNAP entries 196 * are converted to BLK_NOCOPY. These are needed to allow fsck to 197 * identify blocks that are in use by other snapshots (which are 198 * expunged from this snapshot). 199 */ 200 #define BLK_NOCOPY ((ufs2_daddr_t)(1)) 201 #define BLK_SNAP ((ufs2_daddr_t)(2)) 202 203 /* 204 * Sysctl values for the fast filesystem. 205 */ 206 #define FFS_ADJ_REFCNT 1 /* adjust inode reference count */ 207 #define FFS_ADJ_BLKCNT 2 /* adjust inode used block count */ 208 #define FFS_BLK_FREE 3 /* free range of blocks in map */ 209 #define FFS_DIR_FREE 4 /* free specified dir inodes in map */ 210 #define FFS_FILE_FREE 5 /* free specified file inodes in map */ 211 #define FFS_SET_FLAGS 6 /* set filesystem flags */ 212 #define FFS_ADJ_NDIR 7 /* adjust number of directories */ 213 #define FFS_ADJ_NBFREE 8 /* adjust number of free blocks */ 214 #define FFS_ADJ_NIFREE 9 /* adjust number of free inodes */ 215 #define FFS_ADJ_NFFREE 10 /* adjust number of free frags */ 216 #define FFS_ADJ_NUMCLUSTERS 11 /* adjust number of free clusters */ 217 #define FFS_SET_CWD 12 /* set current directory */ 218 #define FFS_SET_DOTDOT 13 /* set inode number for ".." */ 219 #define FFS_UNLINK 14 /* remove a name in the filesystem */ 220 #define FFS_SET_INODE 15 /* update an on-disk inode */ 221 #define FFS_SET_BUFOUTPUT 16 /* set buffered writing on descriptor */ 222 #define FFS_MAXID 16 /* number of valid ffs ids */ 223 224 /* 225 * Command structure passed in to the filesystem to adjust filesystem values. 226 */ 227 #define FFS_CMD_VERSION 0x19790518 /* version ID */ 228 struct fsck_cmd { 229 int32_t version; /* version of command structure */ 230 int32_t handle; /* reference to filesystem to be changed */ 231 int64_t value; /* inode or block number to be affected */ 232 int64_t size; /* amount or range to be adjusted */ 233 int64_t spare; /* reserved for future use */ 234 }; 235 236 /* 237 * A recovery structure placed at the end of the boot block area by newfs 238 * that can be used by fsck to search for alternate superblocks. 239 */ 240 #define RESID (4096 - 20) /* disk sector size minus recovery area size */ 241 struct fsrecovery { 242 char block[RESID]; /* unused part of sector */ 243 int32_t fsr_magic; /* magic number */ 244 int32_t fsr_fsbtodb; /* fsbtodb and dbtofsb shift constant */ 245 int32_t fsr_sblkno; /* offset of super-block in filesys */ 246 int32_t fsr_fpg; /* blocks per group * fs_frag */ 247 u_int32_t fsr_ncg; /* number of cylinder groups */ 248 }; 249 250 /* 251 * Per cylinder group information; summarized in blocks allocated 252 * from first cylinder group data blocks. These blocks have to be 253 * read in from fs_csaddr (size fs_cssize) in addition to the 254 * super block. 255 */ 256 struct csum { 257 int32_t cs_ndir; /* number of directories */ 258 int32_t cs_nbfree; /* number of free blocks */ 259 int32_t cs_nifree; /* number of free inodes */ 260 int32_t cs_nffree; /* number of free frags */ 261 }; 262 struct csum_total { 263 int64_t cs_ndir; /* number of directories */ 264 int64_t cs_nbfree; /* number of free blocks */ 265 int64_t cs_nifree; /* number of free inodes */ 266 int64_t cs_nffree; /* number of free frags */ 267 int64_t cs_numclusters; /* number of free clusters */ 268 int64_t cs_spare[3]; /* future expansion */ 269 }; 270 271 /* 272 * Super block for an FFS filesystem. 273 */ 274 struct fs { 275 int32_t fs_firstfield; /* historic filesystem linked list, */ 276 int32_t fs_unused_1; /* used for incore super blocks */ 277 int32_t fs_sblkno; /* offset of super-block in filesys */ 278 int32_t fs_cblkno; /* offset of cyl-block in filesys */ 279 int32_t fs_iblkno; /* offset of inode-blocks in filesys */ 280 int32_t fs_dblkno; /* offset of first data after cg */ 281 int32_t fs_old_cgoffset; /* cylinder group offset in cylinder */ 282 int32_t fs_old_cgmask; /* used to calc mod fs_ntrak */ 283 int32_t fs_old_time; /* last time written */ 284 int32_t fs_old_size; /* number of blocks in fs */ 285 int32_t fs_old_dsize; /* number of data blocks in fs */ 286 u_int32_t fs_ncg; /* number of cylinder groups */ 287 int32_t fs_bsize; /* size of basic blocks in fs */ 288 int32_t fs_fsize; /* size of frag blocks in fs */ 289 int32_t fs_frag; /* number of frags in a block in fs */ 290 /* these are configuration parameters */ 291 int32_t fs_minfree; /* minimum percentage of free blocks */ 292 int32_t fs_old_rotdelay; /* num of ms for optimal next block */ 293 int32_t fs_old_rps; /* disk revolutions per second */ 294 /* these fields can be computed from the others */ 295 int32_t fs_bmask; /* ``blkoff'' calc of blk offsets */ 296 int32_t fs_fmask; /* ``fragoff'' calc of frag offsets */ 297 int32_t fs_bshift; /* ``lblkno'' calc of logical blkno */ 298 int32_t fs_fshift; /* ``numfrags'' calc number of frags */ 299 /* these are configuration parameters */ 300 int32_t fs_maxcontig; /* max number of contiguous blks */ 301 int32_t fs_maxbpg; /* max number of blks per cyl group */ 302 /* these fields can be computed from the others */ 303 int32_t fs_fragshift; /* block to frag shift */ 304 int32_t fs_fsbtodb; /* fsbtodb and dbtofsb shift constant */ 305 int32_t fs_sbsize; /* actual size of super block */ 306 int32_t fs_spare1[2]; /* old fs_csmask */ 307 /* old fs_csshift */ 308 int32_t fs_nindir; /* value of NINDIR */ 309 u_int32_t fs_inopb; /* value of INOPB */ 310 int32_t fs_old_nspf; /* value of NSPF */ 311 /* yet another configuration parameter */ 312 int32_t fs_optim; /* optimization preference, see below */ 313 int32_t fs_old_npsect; /* # sectors/track including spares */ 314 int32_t fs_old_interleave; /* hardware sector interleave */ 315 int32_t fs_old_trackskew; /* sector 0 skew, per track */ 316 int32_t fs_id[2]; /* unique filesystem id */ 317 /* sizes determined by number of cylinder groups and their sizes */ 318 int32_t fs_old_csaddr; /* blk addr of cyl grp summary area */ 319 int32_t fs_cssize; /* size of cyl grp summary area */ 320 int32_t fs_cgsize; /* cylinder group size */ 321 int32_t fs_spare2; /* old fs_ntrak */ 322 int32_t fs_old_nsect; /* sectors per track */ 323 int32_t fs_old_spc; /* sectors per cylinder */ 324 int32_t fs_old_ncyl; /* cylinders in filesystem */ 325 int32_t fs_old_cpg; /* cylinders per group */ 326 u_int32_t fs_ipg; /* inodes per group */ 327 int32_t fs_fpg; /* blocks per group * fs_frag */ 328 /* this data must be re-computed after crashes */ 329 struct csum fs_old_cstotal; /* cylinder summary information */ 330 /* these fields are cleared at mount time */ 331 int8_t fs_fmod; /* super block modified flag */ 332 int8_t fs_clean; /* filesystem is clean flag */ 333 int8_t fs_ronly; /* mounted read-only flag */ 334 int8_t fs_old_flags; /* old FS_ flags */ 335 u_char fs_fsmnt[MAXMNTLEN]; /* name mounted on */ 336 u_char fs_volname[MAXVOLLEN]; /* volume name */ 337 u_int64_t fs_swuid; /* system-wide uid */ 338 int32_t fs_pad; /* due to alignment of fs_swuid */ 339 /* these fields retain the current block allocation info */ 340 int32_t fs_cgrotor; /* last cg searched */ 341 void *fs_ocsp[NOCSPTRS]; /* padding; was list of fs_cs buffers */ 342 u_int8_t *fs_contigdirs; /* (u) # of contig. allocated dirs */ 343 struct csum *fs_csp; /* (u) cg summary info buffer */ 344 int32_t *fs_maxcluster; /* (u) max cluster in each cyl group */ 345 u_int *fs_active; /* (u) used by snapshots to track fs */ 346 int32_t fs_old_cpc; /* cyl per cycle in postbl */ 347 int32_t fs_maxbsize; /* maximum blocking factor permitted */ 348 int64_t fs_unrefs; /* number of unreferenced inodes */ 349 int64_t fs_providersize; /* size of underlying GEOM provider */ 350 int64_t fs_metaspace; /* size of area reserved for metadata */ 351 int64_t fs_sparecon64[14]; /* old rotation block list head */ 352 int64_t fs_sblockloc; /* byte offset of standard superblock */ 353 struct csum_total fs_cstotal; /* (u) cylinder summary information */ 354 ufs_time_t fs_time; /* last time written */ 355 int64_t fs_size; /* number of blocks in fs */ 356 int64_t fs_dsize; /* number of data blocks in fs */ 357 ufs2_daddr_t fs_csaddr; /* blk addr of cyl grp summary area */ 358 int64_t fs_pendingblocks; /* (u) blocks being freed */ 359 u_int32_t fs_pendinginodes; /* (u) inodes being freed */ 360 uint32_t fs_snapinum[FSMAXSNAP];/* list of snapshot inode numbers */ 361 u_int32_t fs_avgfilesize; /* expected average file size */ 362 u_int32_t fs_avgfpdir; /* expected # of files per directory */ 363 int32_t fs_save_cgsize; /* save real cg size to use fs_bsize */ 364 ufs_time_t fs_mtime; /* Last mount or fsck time. */ 365 int32_t fs_sujfree; /* SUJ free list */ 366 int32_t fs_sparecon32[23]; /* reserved for future constants */ 367 int32_t fs_flags; /* see FS_ flags below */ 368 int32_t fs_contigsumsize; /* size of cluster summary array */ 369 int32_t fs_maxsymlinklen; /* max length of an internal symlink */ 370 int32_t fs_old_inodefmt; /* format of on-disk inodes */ 371 u_int64_t fs_maxfilesize; /* maximum representable file size */ 372 int64_t fs_qbmask; /* ~fs_bmask for use with 64-bit size */ 373 int64_t fs_qfmask; /* ~fs_fmask for use with 64-bit size */ 374 int32_t fs_state; /* validate fs_clean field */ 375 int32_t fs_old_postblformat; /* format of positional layout tables */ 376 int32_t fs_old_nrpos; /* number of rotational positions */ 377 int32_t fs_spare5[2]; /* old fs_postbloff */ 378 /* old fs_rotbloff */ 379 int32_t fs_magic; /* magic number */ 380 }; 381 382 /* Sanity checking. */ 383 #ifdef CTASSERT 384 CTASSERT(sizeof(struct fs) == 1376); 385 #endif 386 387 /* 388 * Filesystem identification 389 */ 390 #define FS_UFS1_MAGIC 0x011954 /* UFS1 fast filesystem magic number */ 391 #define FS_UFS2_MAGIC 0x19540119 /* UFS2 fast filesystem magic number */ 392 #define FS_BAD_MAGIC 0x19960408 /* UFS incomplete newfs magic number */ 393 #define FS_OKAY 0x7c269d38 /* superblock checksum */ 394 #define FS_42INODEFMT -1 /* 4.2BSD inode format */ 395 #define FS_44INODEFMT 2 /* 4.4BSD inode format */ 396 397 /* 398 * Preference for optimization. 399 */ 400 #define FS_OPTTIME 0 /* minimize allocation time */ 401 #define FS_OPTSPACE 1 /* minimize disk fragmentation */ 402 403 /* 404 * Filesystem flags. 405 * 406 * The FS_UNCLEAN flag is set by the kernel when the filesystem was 407 * mounted with fs_clean set to zero. The FS_DOSOFTDEP flag indicates 408 * that the filesystem should be managed by the soft updates code. 409 * Note that the FS_NEEDSFSCK flag is set and cleared only by the 410 * fsck utility. It is set when background fsck finds an unexpected 411 * inconsistency which requires a traditional foreground fsck to be 412 * run. Such inconsistencies should only be found after an uncorrectable 413 * disk error. A foreground fsck will clear the FS_NEEDSFSCK flag when 414 * it has successfully cleaned up the filesystem. The kernel uses this 415 * flag to enforce that inconsistent filesystems be mounted read-only. 416 * The FS_INDEXDIRS flag when set indicates that the kernel maintains 417 * on-disk auxiliary indexes (such as B-trees) for speeding directory 418 * accesses. Kernels that do not support auxiliary indices clear the 419 * flag to indicate that the indices need to be rebuilt (by fsck) before 420 * they can be used. 421 * 422 * FS_ACLS indicates that POSIX.1e ACLs are administratively enabled 423 * for the file system, so they should be loaded from extended attributes, 424 * observed for access control purposes, and be administered by object 425 * owners. FS_NFS4ACLS indicates that NFSv4 ACLs are administratively 426 * enabled. This flag is mutually exclusive with FS_ACLS. FS_MULTILABEL 427 * indicates that the TrustedBSD MAC Framework should attempt to back MAC 428 * labels into extended attributes on the file system rather than maintain 429 * a single mount label for all objects. 430 */ 431 #define FS_UNCLEAN 0x0001 /* filesystem not clean at mount */ 432 #define FS_DOSOFTDEP 0x0002 /* filesystem using soft dependencies */ 433 #define FS_NEEDSFSCK 0x0004 /* filesystem needs sync fsck before mount */ 434 #define FS_SUJ 0x0008 /* Filesystem using softupdate journal */ 435 #define FS_ACLS 0x0010 /* file system has POSIX.1e ACLs enabled */ 436 #define FS_MULTILABEL 0x0020 /* file system is MAC multi-label */ 437 #define FS_GJOURNAL 0x0040 /* gjournaled file system */ 438 #define FS_FLAGS_UPDATED 0x0080 /* flags have been moved to new location */ 439 #define FS_NFS4ACLS 0x0100 /* file system has NFSv4 ACLs enabled */ 440 #define FS_INDEXDIRS 0x0200 /* kernel supports indexed directories */ 441 #define FS_TRIM 0x0400 /* issue BIO_DELETE for deleted blocks */ 442 443 /* 444 * Macros to access bits in the fs_active array. 445 */ 446 #define ACTIVECGNUM(fs, cg) ((fs)->fs_active[(cg) / (NBBY * sizeof(int))]) 447 #define ACTIVECGOFF(cg) (1 << ((cg) % (NBBY * sizeof(int)))) 448 #define ACTIVESET(fs, cg) do { \ 449 if ((fs)->fs_active) \ 450 ACTIVECGNUM((fs), (cg)) |= ACTIVECGOFF((cg)); \ 451 } while (0) 452 #define ACTIVECLEAR(fs, cg) do { \ 453 if ((fs)->fs_active) \ 454 ACTIVECGNUM((fs), (cg)) &= ~ACTIVECGOFF((cg)); \ 455 } while (0) 456 457 /* 458 * The size of a cylinder group is calculated by CGSIZE. The maximum size 459 * is limited by the fact that cylinder groups are at most one block. 460 * Its size is derived from the size of the maps maintained in the 461 * cylinder group and the (struct cg) size. 462 */ 463 #define CGSIZE(fs) \ 464 /* base cg */ (sizeof(struct cg) + sizeof(int32_t) + \ 465 /* old btotoff */ (fs)->fs_old_cpg * sizeof(int32_t) + \ 466 /* old boff */ (fs)->fs_old_cpg * sizeof(u_int16_t) + \ 467 /* inode map */ howmany((fs)->fs_ipg, NBBY) + \ 468 /* block map */ howmany((fs)->fs_fpg, NBBY) +\ 469 /* if present */ ((fs)->fs_contigsumsize <= 0 ? 0 : \ 470 /* cluster sum */ (fs)->fs_contigsumsize * sizeof(int32_t) + \ 471 /* cluster map */ howmany(fragstoblks(fs, (fs)->fs_fpg), NBBY))) 472 473 /* 474 * The minimal number of cylinder groups that should be created. 475 */ 476 #define MINCYLGRPS 4 477 478 /* 479 * Convert cylinder group to base address of its global summary info. 480 */ 481 #define fs_cs(fs, indx) fs_csp[indx] 482 483 /* 484 * Cylinder group block for a filesystem. 485 */ 486 #define CG_MAGIC 0x090255 487 struct cg { 488 int32_t cg_firstfield; /* historic cyl groups linked list */ 489 int32_t cg_magic; /* magic number */ 490 int32_t cg_old_time; /* time last written */ 491 u_int32_t cg_cgx; /* we are the cgx'th cylinder group */ 492 int16_t cg_old_ncyl; /* number of cyl's this cg */ 493 int16_t cg_old_niblk; /* number of inode blocks this cg */ 494 u_int32_t cg_ndblk; /* number of data blocks this cg */ 495 struct csum cg_cs; /* cylinder summary information */ 496 u_int32_t cg_rotor; /* position of last used block */ 497 u_int32_t cg_frotor; /* position of last used frag */ 498 u_int32_t cg_irotor; /* position of last used inode */ 499 u_int32_t cg_frsum[MAXFRAG]; /* counts of available frags */ 500 int32_t cg_old_btotoff; /* (int32) block totals per cylinder */ 501 int32_t cg_old_boff; /* (u_int16) free block positions */ 502 u_int32_t cg_iusedoff; /* (u_int8) used inode map */ 503 u_int32_t cg_freeoff; /* (u_int8) free block map */ 504 u_int32_t cg_nextfreeoff; /* (u_int8) next available space */ 505 u_int32_t cg_clustersumoff; /* (u_int32) counts of avail clusters */ 506 u_int32_t cg_clusteroff; /* (u_int8) free cluster map */ 507 u_int32_t cg_nclusterblks; /* number of clusters this cg */ 508 u_int32_t cg_niblk; /* number of inode blocks this cg */ 509 u_int32_t cg_initediblk; /* last initialized inode */ 510 u_int32_t cg_unrefs; /* number of unreferenced inodes */ 511 int32_t cg_sparecon32[2]; /* reserved for future use */ 512 ufs_time_t cg_time; /* time last written */ 513 int64_t cg_sparecon64[3]; /* reserved for future use */ 514 u_int8_t cg_space[1]; /* space for cylinder group maps */ 515 /* actually longer */ 516 }; 517 518 /* 519 * Macros for access to cylinder group array structures 520 */ 521 #define cg_chkmagic(cgp) ((cgp)->cg_magic == CG_MAGIC) 522 #define cg_inosused(cgp) \ 523 ((u_int8_t *)((u_int8_t *)(cgp) + (cgp)->cg_iusedoff)) 524 #define cg_blksfree(cgp) \ 525 ((u_int8_t *)((u_int8_t *)(cgp) + (cgp)->cg_freeoff)) 526 #define cg_clustersfree(cgp) \ 527 ((u_int8_t *)((u_int8_t *)(cgp) + (cgp)->cg_clusteroff)) 528 #define cg_clustersum(cgp) \ 529 ((int32_t *)((uintptr_t)(cgp) + (cgp)->cg_clustersumoff)) 530 531 /* 532 * Turn filesystem block numbers into disk block addresses. 533 * This maps filesystem blocks to device size blocks. 534 */ 535 #define fsbtodb(fs, b) ((daddr_t)(b) << (fs)->fs_fsbtodb) 536 #define dbtofsb(fs, b) ((b) >> (fs)->fs_fsbtodb) 537 538 /* 539 * Cylinder group macros to locate things in cylinder groups. 540 * They calc filesystem addresses of cylinder group data structures. 541 */ 542 #define cgbase(fs, c) (((ufs2_daddr_t)(fs)->fs_fpg) * (c)) 543 #define cgdata(fs, c) (cgdmin(fs, c) + (fs)->fs_metaspace) /* data zone */ 544 #define cgmeta(fs, c) (cgdmin(fs, c)) /* meta data */ 545 #define cgdmin(fs, c) (cgstart(fs, c) + (fs)->fs_dblkno) /* 1st data */ 546 #define cgimin(fs, c) (cgstart(fs, c) + (fs)->fs_iblkno) /* inode blk */ 547 #define cgsblock(fs, c) (cgstart(fs, c) + (fs)->fs_sblkno) /* super blk */ 548 #define cgtod(fs, c) (cgstart(fs, c) + (fs)->fs_cblkno) /* cg block */ 549 #define cgstart(fs, c) \ 550 ((fs)->fs_magic == FS_UFS2_MAGIC ? cgbase(fs, c) : \ 551 (cgbase(fs, c) + (fs)->fs_old_cgoffset * ((c) & ~((fs)->fs_old_cgmask)))) 552 553 /* 554 * Macros for handling inode numbers: 555 * inode number to filesystem block offset. 556 * inode number to cylinder group number. 557 * inode number to filesystem block address. 558 */ 559 #define ino_to_cg(fs, x) (((ino_t)(x)) / (fs)->fs_ipg) 560 #define ino_to_fsba(fs, x) \ 561 ((ufs2_daddr_t)(cgimin(fs, ino_to_cg(fs, (ino_t)(x))) + \ 562 (blkstofrags((fs), ((((ino_t)(x)) % (fs)->fs_ipg) / INOPB(fs)))))) 563 #define ino_to_fsbo(fs, x) (((ino_t)(x)) % INOPB(fs)) 564 565 /* 566 * Give cylinder group number for a filesystem block. 567 * Give cylinder group block number for a filesystem block. 568 */ 569 #define dtog(fs, d) ((d) / (fs)->fs_fpg) 570 #define dtogd(fs, d) ((d) % (fs)->fs_fpg) 571 572 /* 573 * Extract the bits for a block from a map. 574 * Compute the cylinder and rotational position of a cyl block addr. 575 */ 576 #define blkmap(fs, map, loc) \ 577 (((map)[(loc) / NBBY] >> ((loc) % NBBY)) & (0xff >> (NBBY - (fs)->fs_frag))) 578 579 /* 580 * The following macros optimize certain frequently calculated 581 * quantities by using shifts and masks in place of divisions 582 * modulos and multiplications. 583 */ 584 #define blkoff(fs, loc) /* calculates (loc % fs->fs_bsize) */ \ 585 ((loc) & (fs)->fs_qbmask) 586 #define fragoff(fs, loc) /* calculates (loc % fs->fs_fsize) */ \ 587 ((loc) & (fs)->fs_qfmask) 588 #define lfragtosize(fs, frag) /* calculates ((off_t)frag * fs->fs_fsize) */ \ 589 (((off_t)(frag)) << (fs)->fs_fshift) 590 #define lblktosize(fs, blk) /* calculates ((off_t)blk * fs->fs_bsize) */ \ 591 (((off_t)(blk)) << (fs)->fs_bshift) 592 /* Use this only when `blk' is known to be small, e.g., < UFS_NDADDR. */ 593 #define smalllblktosize(fs, blk) /* calculates (blk * fs->fs_bsize) */ \ 594 ((blk) << (fs)->fs_bshift) 595 #define lblkno(fs, loc) /* calculates (loc / fs->fs_bsize) */ \ 596 ((loc) >> (fs)->fs_bshift) 597 #define numfrags(fs, loc) /* calculates (loc / fs->fs_fsize) */ \ 598 ((loc) >> (fs)->fs_fshift) 599 #define blkroundup(fs, size) /* calculates roundup(size, fs->fs_bsize) */ \ 600 (((size) + (fs)->fs_qbmask) & (fs)->fs_bmask) 601 #define fragroundup(fs, size) /* calculates roundup(size, fs->fs_fsize) */ \ 602 (((size) + (fs)->fs_qfmask) & (fs)->fs_fmask) 603 #define fragstoblks(fs, frags) /* calculates (frags / fs->fs_frag) */ \ 604 ((frags) >> (fs)->fs_fragshift) 605 #define blkstofrags(fs, blks) /* calculates (blks * fs->fs_frag) */ \ 606 ((blks) << (fs)->fs_fragshift) 607 #define fragnum(fs, fsb) /* calculates (fsb % fs->fs_frag) */ \ 608 ((fsb) & ((fs)->fs_frag - 1)) 609 #define blknum(fs, fsb) /* calculates rounddown(fsb, fs->fs_frag) */ \ 610 ((fsb) &~ ((fs)->fs_frag - 1)) 611 612 /* 613 * Determine the number of available frags given a 614 * percentage to hold in reserve. 615 */ 616 #define freespace(fs, percentreserved) \ 617 (blkstofrags((fs), (fs)->fs_cstotal.cs_nbfree) + \ 618 (fs)->fs_cstotal.cs_nffree - \ 619 (((off_t)((fs)->fs_dsize)) * (percentreserved) / 100)) 620 621 /* 622 * Determining the size of a file block in the filesystem. 623 */ 624 #define blksize(fs, ip, lbn) \ 625 (((lbn) >= UFS_NDADDR || (ip)->i_size >= \ 626 (uint64_t)smalllblktosize(fs, (lbn) + 1)) \ 627 ? (fs)->fs_bsize \ 628 : (fragroundup(fs, blkoff(fs, (ip)->i_size)))) 629 #define sblksize(fs, size, lbn) \ 630 (((lbn) >= UFS_NDADDR || (size) >= ((lbn) + 1) << (fs)->fs_bshift) \ 631 ? (fs)->fs_bsize \ 632 : (fragroundup(fs, blkoff(fs, (size))))) 633 634 /* 635 * Number of indirects in a filesystem block. 636 */ 637 #define NINDIR(fs) ((fs)->fs_nindir) 638 639 /* 640 * Indirect lbns are aligned on UFS_NDADDR addresses where single indirects 641 * are the negated address of the lowest lbn reachable, double indirects 642 * are this lbn - 1 and triple indirects are this lbn - 2. This yields 643 * an unusual bit order to determine level. 644 */ 645 static inline int 646 lbn_level(ufs_lbn_t lbn) 647 { 648 if (lbn >= 0) 649 return 0; 650 switch (lbn & 0x3) { 651 case 0: 652 return (0); 653 case 1: 654 break; 655 case 2: 656 return (2); 657 case 3: 658 return (1); 659 default: 660 break; 661 } 662 return (-1); 663 } 664 665 static inline ufs_lbn_t 666 lbn_offset(struct fs *fs, int level) 667 { 668 ufs_lbn_t res; 669 670 for (res = 1; level > 0; level--) 671 res *= NINDIR(fs); 672 return (res); 673 } 674 675 /* 676 * Number of inodes in a secondary storage block/fragment. 677 */ 678 #define INOPB(fs) ((fs)->fs_inopb) 679 #define INOPF(fs) ((fs)->fs_inopb >> (fs)->fs_fragshift) 680 681 /* 682 * Softdep journal record format. 683 */ 684 685 #define JOP_ADDREF 1 /* Add a reference to an inode. */ 686 #define JOP_REMREF 2 /* Remove a reference from an inode. */ 687 #define JOP_NEWBLK 3 /* Allocate a block. */ 688 #define JOP_FREEBLK 4 /* Free a block or a tree of blocks. */ 689 #define JOP_MVREF 5 /* Move a reference from one off to another. */ 690 #define JOP_TRUNC 6 /* Partial truncation record. */ 691 #define JOP_SYNC 7 /* fsync() complete record. */ 692 693 #define JREC_SIZE 32 /* Record and segment header size. */ 694 695 #define SUJ_MIN (4 * 1024 * 1024) /* Minimum journal size */ 696 #define SUJ_MAX (32 * 1024 * 1024) /* Maximum journal size */ 697 #define SUJ_FILE ".sujournal" /* Journal file name */ 698 699 /* 700 * Size of the segment record header. There is at most one for each disk 701 * block in the journal. The segment header is followed by an array of 702 * records. fsck depends on the first element in each record being 'op' 703 * and the second being 'ino'. Segments may span multiple disk blocks but 704 * the header is present on each. 705 */ 706 struct jsegrec { 707 uint64_t jsr_seq; /* Our sequence number */ 708 uint64_t jsr_oldest; /* Oldest valid sequence number */ 709 uint16_t jsr_cnt; /* Count of valid records */ 710 uint16_t jsr_blocks; /* Count of device bsize blocks. */ 711 uint32_t jsr_crc; /* 32bit crc of the valid space */ 712 ufs_time_t jsr_time; /* timestamp for mount instance */ 713 }; 714 715 /* 716 * Reference record. Records a single link count modification. 717 */ 718 struct jrefrec { 719 uint32_t jr_op; 720 uint32_t jr_ino; 721 uint32_t jr_parent; 722 uint16_t jr_nlink; 723 uint16_t jr_mode; 724 int64_t jr_diroff; 725 uint64_t jr_unused; 726 }; 727 728 /* 729 * Move record. Records a reference moving within a directory block. The 730 * nlink is unchanged but we must search both locations. 731 */ 732 struct jmvrec { 733 uint32_t jm_op; 734 uint32_t jm_ino; 735 uint32_t jm_parent; 736 uint16_t jm_unused; 737 int64_t jm_oldoff; 738 int64_t jm_newoff; 739 }; 740 741 /* 742 * Block record. A set of frags or tree of blocks starting at an indirect are 743 * freed or a set of frags are allocated. 744 */ 745 struct jblkrec { 746 uint32_t jb_op; 747 uint32_t jb_ino; 748 ufs2_daddr_t jb_blkno; 749 ufs_lbn_t jb_lbn; 750 uint16_t jb_frags; 751 uint16_t jb_oldfrags; 752 uint32_t jb_unused; 753 }; 754 755 /* 756 * Truncation record. Records a partial truncation so that it may be 757 * completed at check time. Also used for sync records. 758 */ 759 struct jtrncrec { 760 uint32_t jt_op; 761 uint32_t jt_ino; 762 int64_t jt_size; 763 uint32_t jt_extsize; 764 uint32_t jt_pad[3]; 765 }; 766 767 union jrec { 768 struct jsegrec rec_jsegrec; 769 struct jrefrec rec_jrefrec; 770 struct jmvrec rec_jmvrec; 771 struct jblkrec rec_jblkrec; 772 struct jtrncrec rec_jtrncrec; 773 }; 774 775 #ifdef CTASSERT 776 CTASSERT(sizeof(struct jsegrec) == JREC_SIZE); 777 CTASSERT(sizeof(struct jrefrec) == JREC_SIZE); 778 CTASSERT(sizeof(struct jmvrec) == JREC_SIZE); 779 CTASSERT(sizeof(struct jblkrec) == JREC_SIZE); 780 CTASSERT(sizeof(struct jtrncrec) == JREC_SIZE); 781 CTASSERT(sizeof(union jrec) == JREC_SIZE); 782 #endif 783 784 extern int inside[], around[]; 785 extern u_char *fragtbl[]; 786 787 /* 788 * IOCTLs used for filesystem write suspension. 789 */ 790 #define UFSSUSPEND _IOW('U', 1, fsid_t) 791 #define UFSRESUME _IO('U', 2) 792 793 #endif 794