1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 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 * $FreeBSD$ 33 */ 34 35 #ifndef _UFS_FFS_FS_H_ 36 #define _UFS_FFS_FS_H_ 37 38 #include <sys/mount.h> 39 #include <ufs/ufs/dinode.h> 40 41 /* 42 * Each disk drive contains some number of filesystems. 43 * A filesystem consists of a number of cylinder groups. 44 * Each cylinder group has inodes and data. 45 * 46 * A filesystem 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 filesystem 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 #define SBLOCK_FLOPPY 0 74 #define SBLOCK_UFS1 8192 75 #define SBLOCK_UFS2 65536 76 #define SBLOCK_PIGGY 262144 77 #define SBLOCKSIZE 8192 78 #define SBLOCKSEARCH \ 79 { SBLOCK_UFS2, SBLOCK_UFS1, SBLOCK_FLOPPY, SBLOCK_PIGGY, -1 } 80 /* 81 * Request standard superblock location in ffs_sbget(). 82 */ 83 #define UFS_STDSB -1 /* Search standard places for superblock */ 84 85 /* 86 * UFS_NOMSG indicates that superblock inconsistency error messages 87 * should not be printed. It is used by programs like fsck that 88 * want to print their own error message. 89 * 90 * UFS_NOCSUM causes only the superblock itself to be returned, but does 91 * not read in any auxiliary data structures like the cylinder group 92 * summary information. It is used by clients like glabel that just 93 * want to check for possible filesystem types. Using UFS_NOCSUM 94 * skips the superblock checks for csum data which allows superblocks 95 * that have corrupted csum data to be read and used. 96 * 97 * UFS_NOHASHFAIL will note that the check hash is wrong but will still 98 * return the superblock. This is used by the bootstrap code to 99 * give the system a chance to come up so that fsck can be run to 100 * correct the problem. 101 * 102 * UFS_NOWARNFAIL will warn about inconsistencies but still return the 103 * superblock. It includes UFS_NOHASHFAIL. UFS_NOWARNFAIL is used by 104 * programs like fsck_ffs(8) to debug broken filesystems. 105 */ 106 #define UFS_NOHASHFAIL 0x0001 /* Ignore check-hash failure */ 107 #define UFS_NOWARNFAIL 0x0003 /* Ignore non-fatal inconsistencies */ 108 #define UFS_NOMSG 0x0004 /* Print no error message */ 109 #define UFS_NOCSUM 0x0008 /* Read just the superblock without csum */ 110 #define UFS_ALTSBLK 0x1000 /* Flag used internally */ 111 112 /* 113 * Max number of fragments per block. This value is NOT tweakable. 114 */ 115 #define MAXFRAG 8 116 117 /* 118 * Addresses stored in inodes are capable of addressing fragments 119 * of `blocks'. File system blocks of at most size MAXBSIZE can 120 * be optionally broken into 2, 4, or 8 pieces, each of which is 121 * addressable; these pieces may be DEV_BSIZE, or some multiple of 122 * a DEV_BSIZE unit. 123 * 124 * Large files consist of exclusively large data blocks. To avoid 125 * undue wasted disk space, the last data block of a small file may be 126 * allocated as only as many fragments of a large block as are 127 * necessary. The filesystem format retains only a single pointer 128 * to such a fragment, which is a piece of a single large block that 129 * has been divided. The size of such a fragment is determinable from 130 * information in the inode, using the ``blksize(fs, ip, lbn)'' macro. 131 * 132 * The filesystem records space availability at the fragment level; 133 * to determine block availability, aligned fragments are examined. 134 */ 135 136 /* 137 * MINBSIZE is the smallest allowable block size. 138 * In order to insure that it is possible to create files of size 139 * 2^32 with only two levels of indirection, MINBSIZE is set to 4096. 140 * MINBSIZE must be big enough to hold a cylinder group block, 141 * thus changes to (struct cg) must keep its size within MINBSIZE. 142 * Note that super blocks are always of size SBLOCKSIZE, 143 * and that both SBLOCKSIZE and MAXBSIZE must be >= MINBSIZE. 144 */ 145 #define MINBSIZE 4096 146 147 /* 148 * The path name on which the filesystem is mounted is maintained 149 * in fs_fsmnt. MAXMNTLEN defines the amount of space allocated in 150 * the super block for this name. 151 */ 152 #define MAXMNTLEN 468 153 154 /* 155 * The volume name for this filesystem is maintained in fs_volname. 156 * MAXVOLLEN defines the length of the buffer allocated. 157 */ 158 #define MAXVOLLEN 32 159 160 /* 161 * There is a 128-byte region in the superblock reserved for in-core 162 * pointers to summary information. Originally this included an array 163 * of pointers to blocks of struct csum; now there are just a few 164 * pointers and the remaining space is padded with fs_ocsp[]. 165 * 166 * NOCSPTRS determines the size of this padding. Historically this 167 * space was used to store pointers to structures that summaried 168 * filesystem usage and layout information. However, these pointers 169 * left various kernel pointers in the superblock which made otherwise 170 * identical superblocks appear to have differences. So, all the 171 * pointers in the superblock were moved to a fs_summary_info structure 172 * reducing the superblock to having only a single pointer to this 173 * structure. When writing the superblock to disk, this pointer is 174 * temporarily NULL'ed out so that the kernel pointer will not appear 175 * in the on-disk copy of the superblock. 176 */ 177 #define NOCSPTRS ((128 / sizeof(void *)) - 1) 178 179 /* 180 * A summary of contiguous blocks of various sizes is maintained 181 * in each cylinder group. Normally this is set by the initial 182 * value of fs_maxcontig. To conserve space, a maximum summary size 183 * is set by FS_MAXCONTIG. 184 */ 185 #define FS_MAXCONTIG 16 186 187 /* 188 * MINFREE gives the minimum acceptable percentage of filesystem 189 * blocks which may be free. If the freelist drops below this level 190 * only the superuser may continue to allocate blocks. This may 191 * be set to 0 if no reserve of free blocks is deemed necessary, 192 * however throughput drops by fifty percent if the filesystem 193 * is run at between 95% and 100% full; thus the minimum default 194 * value of fs_minfree is 5%. However, to get good clustering 195 * performance, 10% is a better choice. hence we use 10% as our 196 * default value. With 10% free space, fragmentation is not a 197 * problem, so we choose to optimize for time. 198 */ 199 #define MINFREE 8 200 #define DEFAULTOPT FS_OPTTIME 201 202 /* 203 * Grigoriy Orlov <gluk@ptci.ru> has done some extensive work to fine 204 * tune the layout preferences for directories within a filesystem. 205 * His algorithm can be tuned by adjusting the following parameters 206 * which tell the system the average file size and the average number 207 * of files per directory. These defaults are well selected for typical 208 * filesystems, but may need to be tuned for odd cases like filesystems 209 * being used for squid caches or news spools. 210 */ 211 #define AVFILESIZ 16384 /* expected average file size */ 212 #define AFPDIR 64 /* expected number of files per directory */ 213 214 /* 215 * The maximum number of snapshot nodes that can be associated 216 * with each filesystem. This limit affects only the number of 217 * snapshot files that can be recorded within the superblock so 218 * that they can be found when the filesystem is mounted. However, 219 * maintaining too many will slow the filesystem performance, so 220 * having this limit is a good idea. 221 */ 222 #define FSMAXSNAP 20 223 224 /* 225 * Used to identify special blocks in snapshots: 226 * 227 * BLK_NOCOPY - A block that was unallocated at the time the snapshot 228 * was taken, hence does not need to be copied when written. 229 * BLK_SNAP - A block held by another snapshot that is not needed by this 230 * snapshot. When the other snapshot is freed, the BLK_SNAP entries 231 * are converted to BLK_NOCOPY. These are needed to allow fsck to 232 * identify blocks that are in use by other snapshots (which are 233 * expunged from this snapshot). 234 */ 235 #define BLK_NOCOPY ((ufs2_daddr_t)(1)) 236 #define BLK_SNAP ((ufs2_daddr_t)(2)) 237 238 /* 239 * Sysctl values for the fast filesystem. 240 */ 241 #define FFS_ADJ_REFCNT 1 /* adjust inode reference count */ 242 #define FFS_ADJ_BLKCNT 2 /* adjust inode used block count */ 243 #define FFS_BLK_FREE 3 /* free range of blocks in map */ 244 #define FFS_DIR_FREE 4 /* free specified dir inodes in map */ 245 #define FFS_FILE_FREE 5 /* free specified file inodes in map */ 246 #define FFS_SET_FLAGS 6 /* set filesystem flags */ 247 #define FFS_ADJ_NDIR 7 /* adjust number of directories */ 248 #define FFS_ADJ_NBFREE 8 /* adjust number of free blocks */ 249 #define FFS_ADJ_NIFREE 9 /* adjust number of free inodes */ 250 #define FFS_ADJ_NFFREE 10 /* adjust number of free frags */ 251 #define FFS_ADJ_NUMCLUSTERS 11 /* adjust number of free clusters */ 252 #define FFS_SET_CWD 12 /* set current directory */ 253 #define FFS_SET_DOTDOT 13 /* set inode number for ".." */ 254 #define FFS_UNLINK 14 /* remove a name in the filesystem */ 255 /* Was FFS_SET_INODE 15 */ 256 /* Was FFS_SET_BUFOUTPUT 16 */ 257 #define FFS_SET_SIZE 17 /* set inode size */ 258 #define FFS_MAXID 17 /* number of valid ffs ids */ 259 260 /* 261 * Command structure passed in to the filesystem to adjust filesystem values. 262 */ 263 #define FFS_CMD_VERSION 0x19790518 /* version ID */ 264 struct fsck_cmd { 265 int32_t version; /* version of command structure */ 266 int32_t handle; /* reference to filesystem to be changed */ 267 int64_t value; /* inode or block number to be affected */ 268 int64_t size; /* amount or range to be adjusted */ 269 int64_t spare; /* reserved for future use */ 270 }; 271 272 /* 273 * A recovery structure placed at the end of the boot block area by newfs 274 * that can be used by fsck to search for alternate superblocks. 275 */ 276 struct fsrecovery { 277 int32_t fsr_magic; /* magic number */ 278 int32_t fsr_fsbtodb; /* fsbtodb and dbtofsb shift constant */ 279 int32_t fsr_sblkno; /* offset of super-block in filesys */ 280 int32_t fsr_fpg; /* blocks per group * fs_frag */ 281 u_int32_t fsr_ncg; /* number of cylinder groups */ 282 }; 283 284 /* 285 * Per cylinder group information; summarized in blocks allocated 286 * from first cylinder group data blocks. These blocks have to be 287 * read in from fs_csaddr (size fs_cssize) in addition to the 288 * super block. 289 */ 290 struct csum { 291 int32_t cs_ndir; /* number of directories */ 292 int32_t cs_nbfree; /* number of free blocks */ 293 int32_t cs_nifree; /* number of free inodes */ 294 int32_t cs_nffree; /* number of free frags */ 295 }; 296 struct csum_total { 297 int64_t cs_ndir; /* number of directories */ 298 int64_t cs_nbfree; /* number of free blocks */ 299 int64_t cs_nifree; /* number of free inodes */ 300 int64_t cs_nffree; /* number of free frags */ 301 int64_t cs_numclusters; /* number of free clusters */ 302 int64_t cs_spare[3]; /* future expansion */ 303 }; 304 305 /* 306 * Pointers to super block summary information. Placed in a separate 307 * structure so there is just one pointer in the superblock. 308 * 309 * The pointers in this structure are used as follows: 310 * fs_contigdirs references an array that tracks the creation of new 311 * directories 312 * fs_csp references a contiguous array of struct csum for 313 * all cylinder groups 314 * fs_maxcluster references an array of cluster sizes that is computed 315 * as cylinder groups are inspected 316 * fs_active is used when creating snapshots; it points to a bitmap 317 * of cylinder groups for which the free-block bitmap has changed 318 * since the snapshot operation began. 319 */ 320 struct fs_summary_info { 321 uint8_t *si_contigdirs; /* (u) # of contig. allocated dirs */ 322 struct csum *si_csp; /* (u) cg summary info buffer */ 323 int32_t *si_maxcluster; /* (u) max cluster in each cyl group */ 324 u_int *si_active; /* (u) used by snapshots to track fs */ 325 }; 326 #define fs_contigdirs fs_si->si_contigdirs 327 #define fs_csp fs_si->si_csp 328 #define fs_maxcluster fs_si->si_maxcluster 329 #define fs_active fs_si->si_active 330 331 /* 332 * Super block for an FFS filesystem. 333 */ 334 struct fs { 335 int32_t fs_firstfield; /* historic filesystem linked list, */ 336 int32_t fs_unused_1; /* used for incore super blocks */ 337 int32_t fs_sblkno; /* offset of super-block in filesys */ 338 int32_t fs_cblkno; /* offset of cyl-block in filesys */ 339 int32_t fs_iblkno; /* offset of inode-blocks in filesys */ 340 int32_t fs_dblkno; /* offset of first data after cg */ 341 int32_t fs_old_cgoffset; /* cylinder group offset in cylinder */ 342 int32_t fs_old_cgmask; /* used to calc mod fs_ntrak */ 343 int32_t fs_old_time; /* last time written */ 344 int32_t fs_old_size; /* number of blocks in fs */ 345 int32_t fs_old_dsize; /* number of data blocks in fs */ 346 u_int32_t fs_ncg; /* number of cylinder groups */ 347 int32_t fs_bsize; /* size of basic blocks in fs */ 348 int32_t fs_fsize; /* size of frag blocks in fs */ 349 int32_t fs_frag; /* number of frags in a block in fs */ 350 /* these are configuration parameters */ 351 int32_t fs_minfree; /* minimum percentage of free blocks */ 352 int32_t fs_old_rotdelay; /* num of ms for optimal next block */ 353 int32_t fs_old_rps; /* disk revolutions per second */ 354 /* these fields can be computed from the others */ 355 int32_t fs_bmask; /* ``blkoff'' calc of blk offsets */ 356 int32_t fs_fmask; /* ``fragoff'' calc of frag offsets */ 357 int32_t fs_bshift; /* ``lblkno'' calc of logical blkno */ 358 int32_t fs_fshift; /* ``numfrags'' calc number of frags */ 359 /* these are configuration parameters */ 360 int32_t fs_maxcontig; /* max number of contiguous blks */ 361 int32_t fs_maxbpg; /* max number of blks per cyl group */ 362 /* these fields can be computed from the others */ 363 int32_t fs_fragshift; /* block to frag shift */ 364 int32_t fs_fsbtodb; /* fsbtodb and dbtofsb shift constant */ 365 int32_t fs_sbsize; /* actual size of super block */ 366 int32_t fs_spare1[2]; /* old fs_csmask */ 367 /* old fs_csshift */ 368 int32_t fs_nindir; /* value of NINDIR */ 369 u_int32_t fs_inopb; /* value of INOPB */ 370 int32_t fs_old_nspf; /* value of NSPF */ 371 /* yet another configuration parameter */ 372 int32_t fs_optim; /* optimization preference, see below */ 373 int32_t fs_old_npsect; /* # sectors/track including spares */ 374 int32_t fs_old_interleave; /* hardware sector interleave */ 375 int32_t fs_old_trackskew; /* sector 0 skew, per track */ 376 int32_t fs_id[2]; /* unique filesystem id */ 377 /* sizes determined by number of cylinder groups and their sizes */ 378 int32_t fs_old_csaddr; /* blk addr of cyl grp summary area */ 379 int32_t fs_cssize; /* size of cyl grp summary area */ 380 int32_t fs_cgsize; /* cylinder group size */ 381 int32_t fs_spare2; /* old fs_ntrak */ 382 int32_t fs_old_nsect; /* sectors per track */ 383 int32_t fs_old_spc; /* sectors per cylinder */ 384 int32_t fs_old_ncyl; /* cylinders in filesystem */ 385 int32_t fs_old_cpg; /* cylinders per group */ 386 u_int32_t fs_ipg; /* inodes per group */ 387 int32_t fs_fpg; /* blocks per group * fs_frag */ 388 /* this data must be re-computed after crashes */ 389 struct csum fs_old_cstotal; /* cylinder summary information */ 390 /* these fields are cleared at mount time */ 391 int8_t fs_fmod; /* super block modified flag */ 392 int8_t fs_clean; /* filesystem is clean flag */ 393 int8_t fs_ronly; /* mounted read-only flag */ 394 int8_t fs_old_flags; /* old FS_ flags */ 395 u_char fs_fsmnt[MAXMNTLEN]; /* name mounted on */ 396 u_char fs_volname[MAXVOLLEN]; /* volume name */ 397 u_int64_t fs_swuid; /* system-wide uid */ 398 int32_t fs_pad; /* due to alignment of fs_swuid */ 399 /* these fields retain the current block allocation info */ 400 int32_t fs_cgrotor; /* last cg searched */ 401 void *fs_ocsp[NOCSPTRS]; /* padding; was list of fs_cs buffers */ 402 struct fs_summary_info *fs_si;/* In-core pointer to summary info */ 403 int32_t fs_old_cpc; /* cyl per cycle in postbl */ 404 int32_t fs_maxbsize; /* maximum blocking factor permitted */ 405 int64_t fs_unrefs; /* number of unreferenced inodes */ 406 int64_t fs_providersize; /* size of underlying GEOM provider */ 407 int64_t fs_metaspace; /* size of area reserved for metadata */ 408 int64_t fs_sparecon64[13]; /* old rotation block list head */ 409 int64_t fs_sblockactualloc; /* byte offset of this superblock */ 410 int64_t fs_sblockloc; /* byte offset of standard superblock */ 411 struct csum_total fs_cstotal; /* (u) cylinder summary information */ 412 ufs_time_t fs_time; /* last time written */ 413 int64_t fs_size; /* number of blocks in fs */ 414 int64_t fs_dsize; /* number of data blocks in fs */ 415 ufs2_daddr_t fs_csaddr; /* blk addr of cyl grp summary area */ 416 int64_t fs_pendingblocks; /* (u) blocks being freed */ 417 u_int32_t fs_pendinginodes; /* (u) inodes being freed */ 418 uint32_t fs_snapinum[FSMAXSNAP];/* list of snapshot inode numbers */ 419 u_int32_t fs_avgfilesize; /* expected average file size */ 420 u_int32_t fs_avgfpdir; /* expected # of files per directory */ 421 int32_t fs_save_cgsize; /* save real cg size to use fs_bsize */ 422 ufs_time_t fs_mtime; /* Last mount or fsck time. */ 423 int32_t fs_sujfree; /* SUJ free list */ 424 int32_t fs_sparecon32[21]; /* reserved for future constants */ 425 u_int32_t fs_ckhash; /* if CK_SUPERBLOCK, its check-hash */ 426 u_int32_t fs_metackhash; /* metadata check-hash, see CK_ below */ 427 int32_t fs_flags; /* see FS_ flags below */ 428 int32_t fs_contigsumsize; /* size of cluster summary array */ 429 int32_t fs_maxsymlinklen; /* max length of an internal symlink */ 430 int32_t fs_old_inodefmt; /* format of on-disk inodes */ 431 u_int64_t fs_maxfilesize; /* maximum representable file size */ 432 int64_t fs_qbmask; /* ~fs_bmask for use with 64-bit size */ 433 int64_t fs_qfmask; /* ~fs_fmask for use with 64-bit size */ 434 int32_t fs_state; /* validate fs_clean field */ 435 int32_t fs_old_postblformat; /* format of positional layout tables */ 436 int32_t fs_old_nrpos; /* number of rotational positions */ 437 int32_t fs_spare5[2]; /* old fs_postbloff */ 438 /* old fs_rotbloff */ 439 int32_t fs_magic; /* magic number */ 440 }; 441 442 /* Sanity checking. */ 443 #ifdef CTASSERT 444 CTASSERT(sizeof(struct fs) == 1376); 445 #endif 446 447 /* 448 * Filesystem identification 449 */ 450 #define FS_UFS1_MAGIC 0x011954 /* UFS1 fast filesystem magic number */ 451 #define FS_UFS2_MAGIC 0x19540119 /* UFS2 fast filesystem magic number */ 452 #define FS_BAD_MAGIC 0x19960408 /* UFS incomplete newfs magic number */ 453 #define FS_42INODEFMT -1 /* 4.2BSD inode format */ 454 #define FS_44INODEFMT 2 /* 4.4BSD inode format */ 455 456 /* 457 * Preference for optimization. 458 */ 459 #define FS_OPTTIME 0 /* minimize allocation time */ 460 #define FS_OPTSPACE 1 /* minimize disk fragmentation */ 461 462 /* 463 * Filesystem flags. 464 * 465 * The FS_UNCLEAN flag is set by the kernel when the filesystem was 466 * mounted with fs_clean set to zero. The FS_DOSOFTDEP flag indicates 467 * that the filesystem should be managed by the soft updates code. 468 * Note that the FS_NEEDSFSCK flag is set and cleared by the fsck 469 * utility. It is set when background fsck finds an unexpected 470 * inconsistency which requires a traditional foreground fsck to be 471 * run. Such inconsistencies should only be found after an uncorrectable 472 * disk error. The FS_NEEDSFSCK can also be set when a mounted filesystem 473 * discovers an internal inconsistency such as freeing a freed inode. 474 * A foreground fsck will clear the FS_NEEDSFSCK flag when it has 475 * successfully cleaned up the filesystem. The kernel uses this 476 * flag to enforce that inconsistent filesystems be mounted read-only. 477 * 478 * The FS_METACKHASH flag when set indicates that the kernel maintains 479 * one or more check hashes. The actual set of supported check hashes 480 * is stored in the fs_metackhash field. Kernels that do not support 481 * check hashes clear the FS_METACKHASH flag to indicate that the 482 * check hashes need to be rebuilt (by fsck) before they can be used. 483 * 484 * When a filesystem is mounted, any flags not included in FS_SUPPORTED 485 * are cleared. This lets newer features know that the filesystem has 486 * been run on an older version of the filesystem and thus that data 487 * structures associated with those features are out-of-date and need 488 * to be rebuilt. 489 * 490 * FS_ACLS indicates that POSIX.1e ACLs are administratively enabled 491 * for the file system, so they should be loaded from extended attributes, 492 * observed for access control purposes, and be administered by object 493 * owners. FS_NFS4ACLS indicates that NFSv4 ACLs are administratively 494 * enabled. This flag is mutually exclusive with FS_ACLS. FS_MULTILABEL 495 * indicates that the TrustedBSD MAC Framework should attempt to back MAC 496 * labels into extended attributes on the file system rather than maintain 497 * a single mount label for all objects. 498 */ 499 #define FS_UNCLEAN 0x00000001 /* filesystem not clean at mount */ 500 #define FS_DOSOFTDEP 0x00000002 /* filesystem using soft dependencies */ 501 #define FS_NEEDSFSCK 0x00000004 /* filesystem needs sync fsck before mount */ 502 #define FS_SUJ 0x00000008 /* Filesystem using softupdate journal */ 503 #define FS_ACLS 0x00000010 /* file system has POSIX.1e ACLs enabled */ 504 #define FS_MULTILABEL 0x00000020 /* file system is MAC multi-label */ 505 #define FS_GJOURNAL 0x00000040 /* gjournaled file system */ 506 #define FS_FLAGS_UPDATED 0x0000080 /* flags have been moved to new location */ 507 #define FS_NFS4ACLS 0x00000100 /* file system has NFSv4 ACLs enabled */ 508 #define FS_METACKHASH 0x00000200 /* kernel supports metadata check hashes */ 509 #define FS_TRIM 0x00000400 /* issue BIO_DELETE for deleted blocks */ 510 #define FS_SUPPORTED 0x00FFFFFF /* supported flags, others cleared at mount*/ 511 /* 512 * Things that we may someday support, but currently do not. 513 * These flags are all cleared so we know if we ran on a kernel 514 * that does not support them. 515 */ 516 #define FS_INDEXDIRS 0x01000000 /* kernel supports indexed directories */ 517 #define FS_VARBLKSIZE 0x02000000 /* kernel supports variable block sizes */ 518 #define FS_COOLOPT1 0x04000000 /* kernel supports cool option 1 */ 519 #define FS_COOLOPT2 0x08000000 /* kernel supports cool option 2 */ 520 #define FS_COOLOPT3 0x10000000 /* kernel supports cool option 3 */ 521 #define FS_COOLOPT4 0x20000000 /* kernel supports cool option 4 */ 522 #define FS_COOLOPT5 0x40000000 /* kernel supports cool option 5 */ 523 #define FS_COOLOPT6 0x80000000 /* kernel supports cool option 6 */ 524 525 /* 526 * The fs_metackhash field indicates the types of metadata check-hash 527 * that are maintained for a filesystem. Not all filesystems check-hash 528 * all metadata. 529 */ 530 #define CK_SUPERBLOCK 0x0001 /* the superblock */ 531 #define CK_CYLGRP 0x0002 /* the cylinder groups */ 532 #define CK_INODE 0x0004 /* inodes */ 533 #define CK_INDIR 0x0008 /* indirect blocks */ 534 #define CK_DIR 0x0010 /* directory contents */ 535 #define CK_SUPPORTED 0x0007 /* supported flags, others cleared at mount */ 536 /* 537 * The BX_FSPRIV buffer b_xflags are used to track types of data in buffers. 538 */ 539 #define BX_SUPERBLOCK 0x00010000 /* superblock */ 540 #define BX_CYLGRP 0x00020000 /* cylinder groups */ 541 #define BX_INODE 0x00040000 /* inodes */ 542 #define BX_INDIR 0x00080000 /* indirect blocks */ 543 #define BX_DIR 0x00100000 /* directory contents */ 544 545 #define PRINT_UFS_BUF_XFLAGS "\20\25dir\24indir\23inode\22cylgrp\21superblock" 546 547 /* 548 * Macros to access bits in the fs_active array. 549 */ 550 #define ACTIVECGNUM(fs, cg) ((fs)->fs_active[(cg) / (NBBY * sizeof(int))]) 551 #define ACTIVECGOFF(cg) (1 << ((cg) % (NBBY * sizeof(int)))) 552 #define ACTIVESET(fs, cg) do { \ 553 if ((fs)->fs_active) \ 554 ACTIVECGNUM((fs), (cg)) |= ACTIVECGOFF((cg)); \ 555 } while (0) 556 #define ACTIVECLEAR(fs, cg) do { \ 557 if ((fs)->fs_active) \ 558 ACTIVECGNUM((fs), (cg)) &= ~ACTIVECGOFF((cg)); \ 559 } while (0) 560 561 /* 562 * The size of a cylinder group is calculated by CGSIZE. The maximum size 563 * is limited by the fact that cylinder groups are at most one block. 564 * Its size is derived from the size of the maps maintained in the 565 * cylinder group and the (struct cg) size. 566 */ 567 #define CGSIZE(fs) \ 568 /* base cg */ (sizeof(struct cg) + sizeof(int32_t) + \ 569 /* old btotoff */ (fs)->fs_old_cpg * sizeof(int32_t) + \ 570 /* old boff */ (fs)->fs_old_cpg * sizeof(u_int16_t) + \ 571 /* inode map */ howmany((fs)->fs_ipg, NBBY) + \ 572 /* block map */ howmany((fs)->fs_fpg, NBBY) +\ 573 /* if present */ ((fs)->fs_contigsumsize <= 0 ? 0 : \ 574 /* cluster sum */ (fs)->fs_contigsumsize * sizeof(int32_t) + \ 575 /* cluster map */ howmany(fragstoblks(fs, (fs)->fs_fpg), NBBY))) 576 577 /* 578 * The minimal number of cylinder groups that should be created. 579 */ 580 #define MINCYLGRPS 4 581 582 /* 583 * Convert cylinder group to base address of its global summary info. 584 */ 585 #define fs_cs(fs, indx) fs_csp[indx] 586 587 /* 588 * Cylinder group block for a filesystem. 589 */ 590 #define CG_MAGIC 0x090255 591 struct cg { 592 int32_t cg_firstfield; /* historic cyl groups linked list */ 593 int32_t cg_magic; /* magic number */ 594 int32_t cg_old_time; /* time last written */ 595 u_int32_t cg_cgx; /* we are the cgx'th cylinder group */ 596 int16_t cg_old_ncyl; /* number of cyl's this cg */ 597 int16_t cg_old_niblk; /* number of inode blocks this cg */ 598 u_int32_t cg_ndblk; /* number of data blocks this cg */ 599 struct csum cg_cs; /* cylinder summary information */ 600 u_int32_t cg_rotor; /* position of last used block */ 601 u_int32_t cg_frotor; /* position of last used frag */ 602 u_int32_t cg_irotor; /* position of last used inode */ 603 u_int32_t cg_frsum[MAXFRAG]; /* counts of available frags */ 604 int32_t cg_old_btotoff; /* (int32) block totals per cylinder */ 605 int32_t cg_old_boff; /* (u_int16) free block positions */ 606 u_int32_t cg_iusedoff; /* (u_int8) used inode map */ 607 u_int32_t cg_freeoff; /* (u_int8) free block map */ 608 u_int32_t cg_nextfreeoff; /* (u_int8) next available space */ 609 u_int32_t cg_clustersumoff; /* (u_int32) counts of avail clusters */ 610 u_int32_t cg_clusteroff; /* (u_int8) free cluster map */ 611 u_int32_t cg_nclusterblks; /* number of clusters this cg */ 612 u_int32_t cg_niblk; /* number of inode blocks this cg */ 613 u_int32_t cg_initediblk; /* last initialized inode */ 614 u_int32_t cg_unrefs; /* number of unreferenced inodes */ 615 int32_t cg_sparecon32[1]; /* reserved for future use */ 616 u_int32_t cg_ckhash; /* check-hash of this cg */ 617 ufs_time_t cg_time; /* time last written */ 618 int64_t cg_sparecon64[3]; /* reserved for future use */ 619 u_int8_t cg_space[1]; /* space for cylinder group maps */ 620 /* actually longer */ 621 }; 622 623 /* 624 * Macros for access to cylinder group array structures 625 */ 626 #define cg_chkmagic(cgp) ((cgp)->cg_magic == CG_MAGIC) 627 #define cg_inosused(cgp) \ 628 ((u_int8_t *)((u_int8_t *)(cgp) + (cgp)->cg_iusedoff)) 629 #define cg_blksfree(cgp) \ 630 ((u_int8_t *)((u_int8_t *)(cgp) + (cgp)->cg_freeoff)) 631 #define cg_clustersfree(cgp) \ 632 ((u_int8_t *)((u_int8_t *)(cgp) + (cgp)->cg_clusteroff)) 633 #define cg_clustersum(cgp) \ 634 ((int32_t *)((uintptr_t)(cgp) + (cgp)->cg_clustersumoff)) 635 636 /* 637 * Turn filesystem block numbers into disk block addresses. 638 * This maps filesystem blocks to device size blocks. 639 */ 640 #define fsbtodb(fs, b) ((daddr_t)(b) << (fs)->fs_fsbtodb) 641 #define dbtofsb(fs, b) ((b) >> (fs)->fs_fsbtodb) 642 643 /* 644 * Cylinder group macros to locate things in cylinder groups. 645 * They calc filesystem addresses of cylinder group data structures. 646 */ 647 #define cgbase(fs, c) (((ufs2_daddr_t)(fs)->fs_fpg) * (c)) 648 #define cgdata(fs, c) (cgdmin(fs, c) + (fs)->fs_metaspace) /* data zone */ 649 #define cgmeta(fs, c) (cgdmin(fs, c)) /* meta data */ 650 #define cgdmin(fs, c) (cgstart(fs, c) + (fs)->fs_dblkno) /* 1st data */ 651 #define cgimin(fs, c) (cgstart(fs, c) + (fs)->fs_iblkno) /* inode blk */ 652 #define cgsblock(fs, c) (cgstart(fs, c) + (fs)->fs_sblkno) /* super blk */ 653 #define cgtod(fs, c) (cgstart(fs, c) + (fs)->fs_cblkno) /* cg block */ 654 #define cgstart(fs, c) \ 655 ((fs)->fs_magic == FS_UFS2_MAGIC ? cgbase(fs, c) : \ 656 (cgbase(fs, c) + (fs)->fs_old_cgoffset * ((c) & ~((fs)->fs_old_cgmask)))) 657 658 /* 659 * Macros for handling inode numbers: 660 * inode number to filesystem block offset. 661 * inode number to cylinder group number. 662 * inode number to filesystem block address. 663 */ 664 #define ino_to_cg(fs, x) (((ino_t)(x)) / (fs)->fs_ipg) 665 #define ino_to_fsba(fs, x) \ 666 ((ufs2_daddr_t)(cgimin(fs, ino_to_cg(fs, (ino_t)(x))) + \ 667 (blkstofrags((fs), ((((ino_t)(x)) % (fs)->fs_ipg) / INOPB(fs)))))) 668 #define ino_to_fsbo(fs, x) (((ino_t)(x)) % INOPB(fs)) 669 670 /* 671 * Give cylinder group number for a filesystem block. 672 * Give cylinder group block number for a filesystem block. 673 */ 674 #define dtog(fs, d) ((d) / (fs)->fs_fpg) 675 #define dtogd(fs, d) ((d) % (fs)->fs_fpg) 676 677 /* 678 * Extract the bits for a block from a map. 679 * Compute the cylinder and rotational position of a cyl block addr. 680 */ 681 #define blkmap(fs, map, loc) \ 682 (((map)[(loc) / NBBY] >> ((loc) % NBBY)) & (0xff >> (NBBY - (fs)->fs_frag))) 683 684 /* 685 * The following macros optimize certain frequently calculated 686 * quantities by using shifts and masks in place of divisions 687 * modulos and multiplications. 688 */ 689 #define blkoff(fs, loc) /* calculates (loc % fs->fs_bsize) */ \ 690 ((loc) & (fs)->fs_qbmask) 691 #define fragoff(fs, loc) /* calculates (loc % fs->fs_fsize) */ \ 692 ((loc) & (fs)->fs_qfmask) 693 #define lfragtosize(fs, frag) /* calculates ((off_t)frag * fs->fs_fsize) */ \ 694 (((off_t)(frag)) << (fs)->fs_fshift) 695 #define lblktosize(fs, blk) /* calculates ((off_t)blk * fs->fs_bsize) */ \ 696 (((off_t)(blk)) << (fs)->fs_bshift) 697 /* Use this only when `blk' is known to be small, e.g., < UFS_NDADDR. */ 698 #define smalllblktosize(fs, blk) /* calculates (blk * fs->fs_bsize) */ \ 699 ((blk) << (fs)->fs_bshift) 700 #define lblkno(fs, loc) /* calculates (loc / fs->fs_bsize) */ \ 701 ((loc) >> (fs)->fs_bshift) 702 #define numfrags(fs, loc) /* calculates (loc / fs->fs_fsize) */ \ 703 ((loc) >> (fs)->fs_fshift) 704 #define blkroundup(fs, size) /* calculates roundup(size, fs->fs_bsize) */ \ 705 (((size) + (fs)->fs_qbmask) & (fs)->fs_bmask) 706 #define fragroundup(fs, size) /* calculates roundup(size, fs->fs_fsize) */ \ 707 (((size) + (fs)->fs_qfmask) & (fs)->fs_fmask) 708 #define fragstoblks(fs, frags) /* calculates (frags / fs->fs_frag) */ \ 709 ((frags) >> (fs)->fs_fragshift) 710 #define blkstofrags(fs, blks) /* calculates (blks * fs->fs_frag) */ \ 711 ((blks) << (fs)->fs_fragshift) 712 #define fragnum(fs, fsb) /* calculates (fsb % fs->fs_frag) */ \ 713 ((fsb) & ((fs)->fs_frag - 1)) 714 #define blknum(fs, fsb) /* calculates rounddown(fsb, fs->fs_frag) */ \ 715 ((fsb) &~ ((fs)->fs_frag - 1)) 716 717 /* 718 * Determine the number of available frags given a 719 * percentage to hold in reserve. 720 */ 721 #define freespace(fs, percentreserved) \ 722 (blkstofrags((fs), (fs)->fs_cstotal.cs_nbfree) + \ 723 (fs)->fs_cstotal.cs_nffree - \ 724 (((off_t)((fs)->fs_dsize)) * (percentreserved) / 100)) 725 726 /* 727 * Determining the size of a file block in the filesystem. 728 */ 729 #define blksize(fs, ip, lbn) \ 730 (((lbn) >= UFS_NDADDR || (ip)->i_size >= \ 731 (uint64_t)smalllblktosize(fs, (lbn) + 1)) \ 732 ? (fs)->fs_bsize \ 733 : (fragroundup(fs, blkoff(fs, (ip)->i_size)))) 734 #define sblksize(fs, size, lbn) \ 735 (((lbn) >= UFS_NDADDR || (size) >= ((lbn) + 1) << (fs)->fs_bshift) \ 736 ? (fs)->fs_bsize \ 737 : (fragroundup(fs, blkoff(fs, (size))))) 738 739 /* 740 * Number of indirects in a filesystem block. 741 */ 742 #define NINDIR(fs) ((fs)->fs_nindir) 743 744 /* 745 * Indirect lbns are aligned on UFS_NDADDR addresses where single indirects 746 * are the negated address of the lowest lbn reachable, double indirects 747 * are this lbn - 1 and triple indirects are this lbn - 2. This yields 748 * an unusual bit order to determine level. 749 */ 750 static inline int 751 lbn_level(ufs_lbn_t lbn) 752 { 753 if (lbn >= 0) 754 return 0; 755 switch (lbn & 0x3) { 756 case 0: 757 return (0); 758 case 1: 759 break; 760 case 2: 761 return (2); 762 case 3: 763 return (1); 764 default: 765 break; 766 } 767 return (-1); 768 } 769 770 static inline ufs_lbn_t 771 lbn_offset(struct fs *fs, int level) 772 { 773 ufs_lbn_t res; 774 775 for (res = 1; level > 0; level--) 776 res *= NINDIR(fs); 777 return (res); 778 } 779 780 /* 781 * Number of inodes in a secondary storage block/fragment. 782 */ 783 #define INOPB(fs) ((fs)->fs_inopb) 784 #define INOPF(fs) ((fs)->fs_inopb >> (fs)->fs_fragshift) 785 786 /* 787 * Softdep journal record format. 788 */ 789 790 #define JOP_ADDREF 1 /* Add a reference to an inode. */ 791 #define JOP_REMREF 2 /* Remove a reference from an inode. */ 792 #define JOP_NEWBLK 3 /* Allocate a block. */ 793 #define JOP_FREEBLK 4 /* Free a block or a tree of blocks. */ 794 #define JOP_MVREF 5 /* Move a reference from one off to another. */ 795 #define JOP_TRUNC 6 /* Partial truncation record. */ 796 #define JOP_SYNC 7 /* fsync() complete record. */ 797 798 #define JREC_SIZE 32 /* Record and segment header size. */ 799 800 #define SUJ_MIN (4 * 1024 * 1024) /* Minimum journal size */ 801 #define SUJ_MAX (32 * 1024 * 1024) /* Maximum journal size */ 802 #define SUJ_FILE ".sujournal" /* Journal file name */ 803 804 /* 805 * Size of the segment record header. There is at most one for each disk 806 * block in the journal. The segment header is followed by an array of 807 * records. fsck depends on the first element in each record being 'op' 808 * and the second being 'ino'. Segments may span multiple disk blocks but 809 * the header is present on each. 810 */ 811 struct jsegrec { 812 uint64_t jsr_seq; /* Our sequence number */ 813 uint64_t jsr_oldest; /* Oldest valid sequence number */ 814 uint16_t jsr_cnt; /* Count of valid records */ 815 uint16_t jsr_blocks; /* Count of device bsize blocks. */ 816 uint32_t jsr_crc; /* 32bit crc of the valid space */ 817 ufs_time_t jsr_time; /* timestamp for mount instance */ 818 }; 819 820 /* 821 * Reference record. Records a single link count modification. 822 */ 823 struct jrefrec { 824 uint32_t jr_op; 825 uint32_t jr_ino; 826 uint32_t jr_parent; 827 uint16_t jr_nlink; 828 uint16_t jr_mode; 829 int64_t jr_diroff; 830 uint64_t jr_unused; 831 }; 832 833 /* 834 * Move record. Records a reference moving within a directory block. The 835 * nlink is unchanged but we must search both locations. 836 */ 837 struct jmvrec { 838 uint32_t jm_op; 839 uint32_t jm_ino; 840 uint32_t jm_parent; 841 uint16_t jm_unused; 842 int64_t jm_oldoff; 843 int64_t jm_newoff; 844 }; 845 846 /* 847 * Block record. A set of frags or tree of blocks starting at an indirect are 848 * freed or a set of frags are allocated. 849 */ 850 struct jblkrec { 851 uint32_t jb_op; 852 uint32_t jb_ino; 853 ufs2_daddr_t jb_blkno; 854 ufs_lbn_t jb_lbn; 855 uint16_t jb_frags; 856 uint16_t jb_oldfrags; 857 uint32_t jb_unused; 858 }; 859 860 /* 861 * Truncation record. Records a partial truncation so that it may be 862 * completed at check time. Also used for sync records. 863 */ 864 struct jtrncrec { 865 uint32_t jt_op; 866 uint32_t jt_ino; 867 int64_t jt_size; 868 uint32_t jt_extsize; 869 uint32_t jt_pad[3]; 870 }; 871 872 union jrec { 873 struct jsegrec rec_jsegrec; 874 struct jrefrec rec_jrefrec; 875 struct jmvrec rec_jmvrec; 876 struct jblkrec rec_jblkrec; 877 struct jtrncrec rec_jtrncrec; 878 }; 879 880 #ifdef CTASSERT 881 CTASSERT(sizeof(struct jsegrec) == JREC_SIZE); 882 CTASSERT(sizeof(struct jrefrec) == JREC_SIZE); 883 CTASSERT(sizeof(struct jmvrec) == JREC_SIZE); 884 CTASSERT(sizeof(struct jblkrec) == JREC_SIZE); 885 CTASSERT(sizeof(struct jtrncrec) == JREC_SIZE); 886 CTASSERT(sizeof(union jrec) == JREC_SIZE); 887 #endif 888 889 extern int inside[], around[]; 890 extern u_char *fragtbl[]; 891 892 /* 893 * IOCTLs used for filesystem write suspension. 894 */ 895 #define UFSSUSPEND _IOW('U', 1, fsid_t) 896 #define UFSRESUME _IO('U', 2) 897 898 #endif 899