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