lfs.h revision 1.209
1 /* $NetBSD: lfs.h,v 1.209 2025/09/15 04:14:59 perseant Exp $ */ 2 3 /* from NetBSD: dinode.h,v 1.25 2016/01/22 23:06:10 dholland Exp */ 4 /* from NetBSD: dir.h,v 1.25 2015/09/01 06:16:03 dholland Exp */ 5 6 /*- 7 * Copyright (c) 1999, 2000, 2001, 2002, 2003 The NetBSD Foundation, Inc. 8 * All rights reserved. 9 * 10 * This code is derived from software contributed to The NetBSD Foundation 11 * by Konrad E. Schroder <perseant (at) hhhh.org>. 12 * 13 * Redistribution and use in source and binary forms, with or without 14 * modification, are permitted provided that the following conditions 15 * are met: 16 * 1. Redistributions of source code must retain the above copyright 17 * notice, this list of conditions and the following disclaimer. 18 * 2. Redistributions in binary form must reproduce the above copyright 19 * notice, this list of conditions and the following disclaimer in the 20 * documentation and/or other materials provided with the distribution. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 23 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 24 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 25 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 26 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 27 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 28 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 29 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 30 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 31 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 32 * POSSIBILITY OF SUCH DAMAGE. 33 */ 34 /*- 35 * Copyright (c) 1991, 1993 36 * The Regents of the University of California. All rights reserved. 37 * 38 * Redistribution and use in source and binary forms, with or without 39 * modification, are permitted provided that the following conditions 40 * are met: 41 * 1. Redistributions of source code must retain the above copyright 42 * notice, this list of conditions and the following disclaimer. 43 * 2. Redistributions in binary form must reproduce the above copyright 44 * notice, this list of conditions and the following disclaimer in the 45 * documentation and/or other materials provided with the distribution. 46 * 3. Neither the name of the University nor the names of its contributors 47 * may be used to endorse or promote products derived from this software 48 * without specific prior written permission. 49 * 50 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 51 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 52 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 53 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 54 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 55 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 56 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 57 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 58 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 59 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 60 * SUCH DAMAGE. 61 * 62 * @(#)lfs.h 8.9 (Berkeley) 5/8/95 63 */ 64 /* 65 * Copyright (c) 2002 Networks Associates Technology, Inc. 66 * All rights reserved. 67 * 68 * This software was developed for the FreeBSD Project by Marshall 69 * Kirk McKusick and Network Associates Laboratories, the Security 70 * Research Division of Network Associates, Inc. under DARPA/SPAWAR 71 * contract N66001-01-C-8035 ("CBOSS"), as part of the DARPA CHATS 72 * research program 73 * 74 * Copyright (c) 1982, 1989, 1993 75 * The Regents of the University of California. All rights reserved. 76 * (c) UNIX System Laboratories, Inc. 77 * All or some portions of this file are derived from material licensed 78 * to the University of California by American Telephone and Telegraph 79 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 80 * the permission of UNIX System Laboratories, Inc. 81 * 82 * Redistribution and use in source and binary forms, with or without 83 * modification, are permitted provided that the following conditions 84 * are met: 85 * 1. Redistributions of source code must retain the above copyright 86 * notice, this list of conditions and the following disclaimer. 87 * 2. Redistributions in binary form must reproduce the above copyright 88 * notice, this list of conditions and the following disclaimer in the 89 * documentation and/or other materials provided with the distribution. 90 * 3. Neither the name of the University nor the names of its contributors 91 * may be used to endorse or promote products derived from this software 92 * without specific prior written permission. 93 * 94 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 95 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 96 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 97 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 98 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 99 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 100 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 101 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 102 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 103 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 104 * SUCH DAMAGE. 105 * 106 * @(#)dinode.h 8.9 (Berkeley) 3/29/95 107 */ 108 /* 109 * Copyright (c) 1982, 1986, 1989, 1993 110 * The Regents of the University of California. All rights reserved. 111 * (c) UNIX System Laboratories, Inc. 112 * All or some portions of this file are derived from material licensed 113 * to the University of California by American Telephone and Telegraph 114 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 115 * the permission of UNIX System Laboratories, Inc. 116 * 117 * Redistribution and use in source and binary forms, with or without 118 * modification, are permitted provided that the following conditions 119 * are met: 120 * 1. Redistributions of source code must retain the above copyright 121 * notice, this list of conditions and the following disclaimer. 122 * 2. Redistributions in binary form must reproduce the above copyright 123 * notice, this list of conditions and the following disclaimer in the 124 * documentation and/or other materials provided with the distribution. 125 * 3. Neither the name of the University nor the names of its contributors 126 * may be used to endorse or promote products derived from this software 127 * without specific prior written permission. 128 * 129 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 130 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 131 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 132 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 133 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 134 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 135 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 136 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 137 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 138 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 139 * SUCH DAMAGE. 140 * 141 * @(#)dir.h 8.5 (Berkeley) 4/27/95 142 */ 143 144 /* 145 * NOTE: COORDINATE ON-DISK FORMAT CHANGES WITH THE FREEBSD PROJECT. 146 */ 147 148 #ifndef _UFS_LFS_LFS_H_ 149 #define _UFS_LFS_LFS_H_ 150 151 #if !defined(_KERNEL) && !defined(_STANDALONE) 152 #include <stddef.h> /* for offsetof */ 153 #endif 154 155 #include <sys/rwlock.h> 156 #include <sys/mutex.h> 157 #include <sys/queue.h> 158 #include <sys/condvar.h> 159 #include <sys/mount.h> 160 #include <sys/pool.h> 161 162 /* 163 * Compile-time options for LFS. 164 */ 165 #define LFS_IFIND_RETRIES 16 166 #define LFS_LOGLENGTH 1024 /* size of debugging log */ 167 #define LFS_MAX_ACTIVE 10 /* Dirty segments before ckp forced */ 168 169 /* 170 * Fixed filesystem layout parameters 171 */ 172 #define LFS_LABELPAD 8192 /* LFS label size */ 173 #define LFS_SBPAD 8192 /* LFS superblock size */ 174 175 #define LFS_UNUSED_INUM 0 /* 0: out of band inode number */ 176 #define LFS_IFILE_INUM 1 /* 1: IFILE inode number */ 177 /* 2: Root inode number */ 178 #define LFS_LOSTFOUNDINO 3 /* 3: lost+found inode number */ 179 #define LFS_FIRST_INUM 4 /* 4: first free inode number */ 180 181 /* 182 * The root inode is the root of the file system. Inode 0 can't be used for 183 * normal purposes and historically bad blocks were linked to inode 1, thus 184 * the root inode is 2. (Inode 1 is no longer used for this purpose, however 185 * numerous dump tapes make this assumption, so we are stuck with it). 186 */ 187 #define ULFS_ROOTINO ((ino_t)2) 188 189 /* 190 * The Whiteout inode# is a dummy non-zero inode number which will 191 * never be allocated to a real file. It is used as a place holder 192 * in the directory entry which has been tagged as a LFS_DT_WHT entry. 193 * See the comments about ULFS_ROOTINO above. 194 */ 195 #define ULFS_WINO ((ino_t)1) 196 197 198 #define LFS_V1_SUMMARY_SIZE 512 /* V1 fixed summary size */ 199 #define LFS_DFL_SUMMARY_SIZE 512 /* Default summary size */ 200 201 #define LFS_MAXNAMLEN 255 /* maximum name length in a dir */ 202 203 #define ULFS_NXADDR 2 204 #define ULFS_NDADDR 12 /* Direct addresses in inode. */ 205 #define ULFS_NIADDR 3 /* Indirect addresses in inode. */ 206 207 /* 208 * Adjustable filesystem parameters 209 */ 210 #ifndef LFS_ATIME_IFILE 211 # define LFS_ATIME_IFILE 0 /* Store atime info in ifile (optional in LFSv1) */ 212 #endif 213 #define LFS_MARKV_MAXBLKCNT 65536 /* Max block count for lfs_markv() */ 214 215 /* 216 * Directories 217 */ 218 219 /* 220 * Directories in LFS are files; they use the same inode and block 221 * mapping structures that regular files do. The directory per se is 222 * manifested in the file contents: an unordered, unstructured 223 * sequence of variable-size directory entries. 224 * 225 * This format and structure is taken (via what was originally shared 226 * ufs-level code) from FFS. Each directory entry is a fixed header 227 * followed by a string, the total length padded to a 4-byte boundary. 228 * All strings include a null terminator; the maximum string length 229 * is LFS_MAXNAMLEN, which is 255. 230 * 231 * The directory entry header structure (struct lfs_dirheader) is just 232 * the header information. A complete entry is this plus a null- 233 * terminated name following it, plus some amount of padding. The 234 * length of the name (not including the null terminator) is given by 235 * the namlen field of the header; the complete record length, 236 * including the null terminator and padding, is given by the reclen 237 * field of the header. The record length is always 4-byte aligned. 238 * (Even on 64-bit volumes, the record length is only 4-byte aligned, 239 * not 8-byte.) 240 * 241 * Historically, FFS directories were/are organized into blocks of 242 * size DIRBLKSIZE that can be written atomically to disk at the 243 * hardware level. Directory entries are not allowed to cross the 244 * boundaries of these blocks. The resulting atomicity is important 245 * for the integrity of FFS volumes; however, for LFS it's irrelevant. 246 * All we have to care about is not writing out directories that 247 * confuse earlier ufs-based versions of the LFS code. 248 * 249 * This means [to be determined]. (XXX) 250 * 251 * As DIRBLKSIZE in its FFS sense is hardware-dependent, and file 252 * system images do from time to time move to different hardware, code 253 * that reads directories should be prepared to handle directories 254 * written in a context where DIRBLKSIZE was different (smaller or 255 * larger) than its current value. Note however that it is not 256 * sensible for DIRBLKSIZE to be larger than the volume fragment size, 257 * and not practically possible for it to be larger than the volume 258 * block size. 259 * 260 * Some further notes: 261 * - the LFS_DIRSIZ macro provides the minimum space needed to hold 262 * a directory entry. 263 * - any particular entry may be arbitrarily larger (which is why the 264 * header stores both the entry size and the name size) to pad out 265 * unused space. 266 * - historically the padding in an entry is not necessarily zeroed 267 * but may contain trash. 268 * - dp->d_reclen is the size of the entry. This is always 4-byte 269 * aligned. 270 * - dp->d_namlen is the length of the string, and should always be 271 * the same as strlen(dp->d_name). 272 * - in particular, space available in an entry is given by 273 * dp->d_reclen - LFS_DIRSIZ(dp), and all space available within a 274 * directory block is tucked away within an existing entry. 275 * - all space within a directory block is part of some entry. 276 * - therefore, inserting a new entry requires finding and 277 * splitting a suitable existing entry, and when entries are 278 * removed their space is merged into the entry ahead of them. 279 * - an empty/unused entry has d_ino set to 0. This normally only 280 * appears in the first entry in a block, as elsewhere the unused 281 * entry should have been merged into the one before it. However, 282 * fsck leaves such entries behind so they must be tolerated 283 * elsewhere. 284 * - a completely empty directory block has one entry whose 285 * d_reclen is DIRBLKSIZ and whose d_ino is 0. 286 * 287 * The "old directory format" referenced by the fs->lfs_isolddirfmt 288 * flag (and some other things) refers to when the type field was 289 * added to directory entries. This change was made to FFS in the 80s, 290 * well before LFS was first written; there should be no LFS volumes 291 * (and certainly no LFS v2-format volumes or LFS64 volumes) where the 292 * old format pertains. All of the related logic should probably be 293 * removed; however, it hasn't been yet, and we get to carry it around 294 * until we can be conclusively sure it isn't needed. 295 * 296 * In the "old directory format" there is no type field and the namlen 297 * field is correspondingly 16 bits wide. On big-endian volumes this 298 * has no effect: namlen cannot exceed 255, so the upper byte is 299 * always 0 and this reads back from the type field as LFS_DT_UNKNOWN. 300 * On little-endian volumes, the namlen field will always be 0 and 301 * the namlen value needs to be read out of the type field. (The type 302 * is always LFS_DT_UNKNOWN.) The directory accessor functions take 303 * care of this so nothing else needs to be aware of it. 304 * 305 * LFS_OLDDIRFMT and LFS_NEWDIRFMT are code numbers for the old and 306 * new directory format respectively. These codes do not appear on 307 * disk; they're generated from a runtime macro called FSFMT() that's 308 * cued by other things. This is why (confusingly) LFS_OLDDIRFMT is 1 309 * and LFS_NEWDIRFMT is 0. 310 * 311 * FSFMT(), LFS_OLDDIRFMT, and LFS_NEWDIRFMT should be removed. (XXX) 312 */ 313 314 /* 315 * Directory block size. 316 */ 317 #undef LFS_DIRBLKSIZ 318 #define LFS_DIRBLKSIZ DEV_BSIZE 319 320 /* 321 * Convert between stat structure type codes and directory entry type codes. 322 */ 323 #define LFS_IFTODT(mode) (((mode) & 0170000) >> 12) 324 #define LFS_DTTOIF(dirtype) ((dirtype) << 12) 325 326 /* 327 * Theoretically, directories can be more than 2Gb in length; however, in 328 * practice this seems unlikely. So, we define the type doff_t as a 32-bit 329 * quantity to keep down the cost of doing lookup on a 32-bit machine. 330 */ 331 #define doff_t int32_t 332 #define lfs_doff_t int32_t 333 #define LFS_MAXDIRSIZE (0x7fffffff) 334 335 /* 336 * File types for d_type 337 */ 338 #define LFS_DT_UNKNOWN 0 339 #define LFS_DT_FIFO 1 340 #define LFS_DT_CHR 2 341 #define LFS_DT_DIR 4 342 #define LFS_DT_BLK 6 343 #define LFS_DT_REG 8 344 #define LFS_DT_LNK 10 345 #define LFS_DT_SOCK 12 346 #define LFS_DT_WHT 14 347 348 /* 349 * (See notes above) 350 */ 351 352 struct lfs_dirheader32 { 353 uint32_t dh_ino; /* inode number of entry */ 354 uint16_t dh_reclen; /* length of this record */ 355 uint8_t dh_type; /* file type, see below */ 356 uint8_t dh_namlen; /* length of string in d_name */ 357 }; 358 __CTASSERT(sizeof(struct lfs_dirheader32) == 8); 359 360 struct lfs_dirheader64 { 361 uint64_t dh_ino; /* inode number of entry */ 362 uint16_t dh_reclen; /* length of this record */ 363 uint8_t dh_type; /* file type, see below */ 364 uint8_t dh_namlen; /* length of string in d_name */ 365 } __aligned(4) __packed; 366 __CTASSERT(sizeof(struct lfs_dirheader64) == 12); 367 368 union lfs_dirheader { 369 struct lfs_dirheader64 u_64; 370 struct lfs_dirheader32 u_32; 371 }; 372 __CTASSERT(__alignof(union lfs_dirheader) == __alignof(struct lfs_dirheader64)); 373 #ifndef __lint__ 374 __CTASSERT(__alignof(union lfs_dirheader) == __alignof(struct lfs_dirheader32)); 375 #endif 376 377 typedef union lfs_dirheader LFS_DIRHEADER; 378 379 /* 380 * Template for manipulating directories. 381 */ 382 383 struct lfs_dirtemplate32 { 384 struct lfs_dirheader32 dot_header; 385 char dot_name[4]; /* must be multiple of 4 */ 386 struct lfs_dirheader32 dotdot_header; 387 char dotdot_name[4]; /* ditto */ 388 }; 389 __CTASSERT(sizeof(struct lfs_dirtemplate32) == 2*(8 + 4)); 390 391 struct lfs_dirtemplate64 { 392 struct lfs_dirheader64 dot_header; 393 char dot_name[4]; /* must be multiple of 4 */ 394 struct lfs_dirheader64 dotdot_header; 395 char dotdot_name[4]; /* ditto */ 396 }; 397 __CTASSERT(sizeof(struct lfs_dirtemplate64) == 2*(12 + 4)); 398 399 union lfs_dirtemplate { 400 struct lfs_dirtemplate64 u_64; 401 struct lfs_dirtemplate32 u_32; 402 }; 403 404 #if 0 405 /* 406 * This is the old format of directories, sans type element. 407 */ 408 struct lfs_odirtemplate { 409 uint32_t dot_ino; 410 int16_t dot_reclen; 411 uint16_t dot_namlen; 412 char dot_name[4]; /* must be multiple of 4 */ 413 uint32_t dotdot_ino; 414 int16_t dotdot_reclen; 415 uint16_t dotdot_namlen; 416 char dotdot_name[4]; /* ditto */ 417 }; 418 __CTASSERT(sizeof(struct lfs_odirtemplate) == 2*(8 + 4)); 419 #endif 420 421 /* 422 * Inodes 423 */ 424 425 /* 426 * A dinode contains all the meta-data associated with a LFS file. 427 * This structure defines the on-disk format of a dinode. Since 428 * this structure describes an on-disk structure, all its fields 429 * are defined by types with precise widths. 430 */ 431 432 struct lfs32_dinode { 433 uint16_t di_mode; /* 0: IFMT, permissions; see below. */ 434 int16_t di_nlink; /* 2: File link count. */ 435 uint32_t di_inumber; /* 4: Inode number. */ 436 uint64_t di_size; /* 8: File byte count. */ 437 int32_t di_atime; /* 16: Last access time. */ 438 int32_t di_atimensec; /* 20: Last access time. */ 439 int32_t di_mtime; /* 24: Last modified time. */ 440 int32_t di_mtimensec; /* 28: Last modified time. */ 441 int32_t di_ctime; /* 32: Last inode change time. */ 442 int32_t di_ctimensec; /* 36: Last inode change time. */ 443 int32_t di_db[ULFS_NDADDR]; /* 40: Direct disk blocks. */ 444 int32_t di_ib[ULFS_NIADDR]; /* 88: Indirect disk blocks. */ 445 uint32_t di_flags; /* 100: Status flags (chflags). */ 446 uint32_t di_blocks; /* 104: Blocks actually held. */ 447 int32_t di_gen; /* 108: Generation number. */ 448 uint32_t di_uid; /* 112: File owner. */ 449 uint32_t di_gid; /* 116: File group. */ 450 uint64_t di_modrev; /* 120: i_modrev for NFSv4 */ 451 }; 452 __CTASSERT(sizeof(struct lfs32_dinode) == 128); 453 454 struct lfs64_dinode { 455 uint16_t di_mode; /* 0: IFMT, permissions; see below. */ 456 int16_t di_nlink; /* 2: File link count. */ 457 uint32_t di_uid; /* 4: File owner. */ 458 uint32_t di_gid; /* 8: File group. */ 459 uint32_t di_blksize; /* 12: Inode blocksize. */ 460 uint64_t di_size; /* 16: File byte count. */ 461 uint64_t di_blocks; /* 24: Bytes actually held. */ 462 int64_t di_atime; /* 32: Last access time. */ 463 int64_t di_mtime; /* 40: Last modified time. */ 464 int64_t di_ctime; /* 48: Last inode change time. */ 465 int64_t di_birthtime; /* 56: Inode creation time. */ 466 int32_t di_mtimensec; /* 64: Last modified time. */ 467 int32_t di_atimensec; /* 68: Last access time. */ 468 int32_t di_ctimensec; /* 72: Last inode change time. */ 469 int32_t di_birthnsec; /* 76: Inode creation time. */ 470 int32_t di_gen; /* 80: Generation number. */ 471 uint32_t di_kernflags; /* 84: Kernel flags. */ 472 uint32_t di_flags; /* 88: Status flags (chflags). */ 473 int32_t di_extsize; /* 92: External attributes block. */ 474 int64_t di_extb[ULFS_NXADDR];/* 96: External attributes block. */ 475 int64_t di_db[ULFS_NDADDR]; /* 112: Direct disk blocks. */ 476 int64_t di_ib[ULFS_NIADDR]; /* 208: Indirect disk blocks. */ 477 uint64_t di_modrev; /* 232: i_modrev for NFSv4 */ 478 uint64_t di_inumber; /* 240: Inode number */ 479 uint64_t di_spare[1]; /* 248: Reserved; currently unused */ 480 }; 481 __CTASSERT(sizeof(struct lfs64_dinode) == 256); 482 483 union lfs_dinode { 484 struct lfs64_dinode u_64; 485 struct lfs32_dinode u_32; 486 }; 487 __CTASSERT(__alignof(union lfs_dinode) == __alignof(struct lfs64_dinode)); 488 __CTASSERT(__alignof(union lfs_dinode) == __alignof(struct lfs32_dinode)); 489 490 /* 491 * The di_db fields may be overlaid with other information for 492 * file types that do not have associated disk storage. Block 493 * and character devices overlay the first data block with their 494 * dev_t value. Short symbolic links place their path in the 495 * di_db area. 496 */ 497 #define di_rdev di_db[0] 498 499 /* Size of the on-disk inode. */ 500 //#define LFS_DINODE1_SIZE (sizeof(struct ulfs1_dinode)) /* 128 */ 501 //#define LFS_DINODE2_SIZE (sizeof(struct ulfs2_dinode)) 502 503 /* File types, found in the upper bits of di_mode. */ 504 #define LFS_IFMT 0170000 /* Mask of file type. */ 505 #define LFS_IFIFO 0010000 /* Named pipe (fifo). */ 506 #define LFS_IFCHR 0020000 /* Character device. */ 507 #define LFS_IFDIR 0040000 /* Directory file. */ 508 #define LFS_IFBLK 0060000 /* Block device. */ 509 #define LFS_IFREG 0100000 /* Regular file. */ 510 #define LFS_IFLNK 0120000 /* Symbolic link. */ 511 #define LFS_IFSOCK 0140000 /* UNIX domain socket. */ 512 #define LFS_IFWHT 0160000 /* Whiteout. */ 513 514 /* 515 * "struct buf" associated definitions 516 */ 517 518 /* Unassigned disk addresses. */ 519 #define UNASSIGNED -1 520 #define UNWRITTEN -2 521 522 /* Unused logical block number */ 523 #define LFS_UNUSED_LBN -1 524 525 /* 526 * On-disk and in-memory checkpoint segment usage structure. 527 */ 528 typedef struct segusage SEGUSE; 529 struct segusage { 530 uint32_t su_nbytes; /* 0: number of live bytes */ 531 uint32_t su_olastmod; /* 4: SEGUSE last modified timestamp */ 532 uint16_t su_nsums; /* 8: number of summaries in segment */ 533 uint16_t su_ninos; /* 10: number of inode blocks in seg */ 534 535 #define SEGUSE_ACTIVE 0x01 /* segment currently being written */ 536 #define SEGUSE_DIRTY 0x02 /* segment has data in it */ 537 #define SEGUSE_SUPERBLOCK 0x04 /* segment contains a superblock */ 538 #define SEGUSE_ERROR 0x08 /* cleaner: do not clean segment */ 539 #define SEGUSE_EMPTY 0x10 /* segment is empty */ 540 #define SEGUSE_INVAL 0x20 /* segment is invalid */ 541 uint32_t su_flags; /* 12: segment flags */ 542 uint64_t su_lastmod; /* 16: last modified timestamp */ 543 }; 544 __CTASSERT(sizeof(struct segusage) == 24); 545 546 typedef struct segusage_v1 SEGUSE_V1; 547 struct segusage_v1 { 548 uint32_t su_nbytes; /* 0: number of live bytes */ 549 uint32_t su_lastmod; /* 4: SEGUSE last modified timestamp */ 550 uint16_t su_nsums; /* 8: number of summaries in segment */ 551 uint16_t su_ninos; /* 10: number of inode blocks in seg */ 552 uint32_t su_flags; /* 12: segment flags */ 553 }; 554 __CTASSERT(sizeof(struct segusage_v1) == 16); 555 556 /* 557 * On-disk file information. One per file with data blocks in the segment. 558 * 559 * The FINFO structure is a header; it is followed by fi_nblocks block 560 * pointers, which are logical block numbers of the file. (These are the 561 * blocks of the file present in this segment.) 562 */ 563 564 typedef struct finfo64 FINFO64; 565 struct finfo64 { 566 uint32_t fi_nblocks; /* number of blocks */ 567 uint32_t fi_version; /* version number */ 568 uint64_t fi_ino; /* inode number */ 569 uint32_t fi_lastlength; /* length of last block in array */ 570 uint32_t fi_pad; /* unused */ 571 } __aligned(4) __packed; 572 __CTASSERT(sizeof(struct finfo64) == 24); 573 574 typedef struct finfo32 FINFO32; 575 struct finfo32 { 576 uint32_t fi_nblocks; /* number of blocks */ 577 uint32_t fi_version; /* version number */ 578 uint32_t fi_ino; /* inode number */ 579 uint32_t fi_lastlength; /* length of last block in array */ 580 }; 581 __CTASSERT(sizeof(struct finfo32) == 16); 582 583 typedef union finfo { 584 struct finfo64 u_64; 585 struct finfo32 u_32; 586 } FINFO; 587 __CTASSERT(__alignof(union finfo) == __alignof(struct finfo64)); 588 #ifndef __lint__ 589 __CTASSERT(__alignof(union finfo) == __alignof(struct finfo32)); 590 #endif 591 592 /* 593 * inode info (part of the segment summary) 594 * 595 * Each one of these is just a block number; wrapping the structure 596 * around it gives more contextual information in the code about 597 * what's going on. 598 */ 599 600 typedef struct iinfo64 { 601 uint64_t ii_block; /* block number */ 602 } __aligned(4) __packed IINFO64; 603 __CTASSERT(sizeof(struct iinfo64) == 8); 604 605 typedef struct iinfo32 { 606 uint32_t ii_block; /* block number */ 607 } IINFO32; 608 __CTASSERT(sizeof(struct iinfo32) == 4); 609 610 typedef union iinfo { 611 struct iinfo64 u_64; 612 struct iinfo32 u_32; 613 } IINFO; 614 __CTASSERT(__alignof(union iinfo) == __alignof(struct iinfo64)); 615 #ifndef __lint__ 616 __CTASSERT(__alignof(union iinfo) == __alignof(struct iinfo32)); 617 #endif 618 619 /* 620 * Index file inode entries. 621 */ 622 623 /* magic value for daddrs */ 624 #define LFS_UNUSED_DADDR 0 /* out-of-band daddr */ 625 # define DADDR_IS_BAD(daddr) ((daddr) == LFS_UNUSED_DADDR) 626 /* magic value for if_nextfree -- indicate orphaned file */ 627 #define LFS_ORPHAN_NEXTFREE(fs) \ 628 ((fs)->lfs_is64 ? ~(uint64_t)0 : ~(uint32_t)0) 629 630 typedef struct ifile64 IFILE64; 631 struct ifile64 { 632 uint32_t if_version; /* inode version number */ 633 uint32_t if_atime_nsec; /* and nanoseconds */ 634 uint64_t if_atime_sec; /* Last access time, seconds */ 635 int64_t if_daddr; /* inode disk address */ 636 uint64_t if_nextfree; /* next-unallocated inode */ 637 } __aligned(4) __packed; 638 __CTASSERT(sizeof(struct ifile64) == 32); 639 640 typedef struct ifile32 IFILE32; 641 struct ifile32 { 642 uint32_t if_version; /* inode version number */ 643 int32_t if_daddr; /* inode disk address */ 644 uint32_t if_nextfree; /* next-unallocated inode */ 645 uint32_t if_atime_sec; /* Last access time, seconds */ 646 uint32_t if_atime_nsec; /* and nanoseconds */ 647 }; 648 __CTASSERT(sizeof(struct ifile32) == 20); 649 650 typedef struct ifile_v1 IFILE_V1; 651 struct ifile_v1 { 652 uint32_t if_version; /* inode version number */ 653 int32_t if_daddr; /* inode disk address */ 654 uint32_t if_nextfree; /* next-unallocated inode */ 655 #if LFS_ATIME_IFILE 656 #error "this cannot work" 657 struct timespec if_atime; /* Last access time */ 658 #endif 659 }; 660 __CTASSERT(sizeof(struct ifile_v1) == 12); 661 662 /* 663 * Note: struct ifile_v1 is often handled by accessing the first three 664 * fields of struct ifile32. (XXX: Blah. This should be cleaned up as 665 * it may in some cases violate the strict-aliasing rules.) 666 */ 667 typedef union ifile { 668 struct ifile64 u_64; 669 struct ifile32 u_32; 670 struct ifile_v1 u_v1; 671 } IFILE; 672 __CTASSERT(__alignof(union ifile) == __alignof(struct ifile64)); 673 #ifndef __lint__ 674 __CTASSERT(__alignof(union ifile) == __alignof(struct ifile32)); 675 __CTASSERT(__alignof(union ifile) == __alignof(struct ifile_v1)); 676 #endif 677 678 /* 679 * Cleaner information structure. This resides in the ifile and is used 680 * to pass information from the kernel to the cleaner. 681 */ 682 683 /* flags for ->flags */ 684 #define LFS_CLEANER_MUST_CLEAN 0x01 685 686 typedef struct _cleanerinfo32 { 687 uint32_t clean; /* 0: number of clean segments */ 688 uint32_t dirty; /* 4: number of dirty segments */ 689 int32_t bfree; /* 8: disk blocks free */ 690 int32_t avail; /* 12: disk blocks available */ 691 uint32_t free_head; /* 16: head of the inode free list */ 692 uint32_t free_tail; /* 20: tail of the inode free list */ 693 uint32_t flags; /* 24: status word from the kernel */ 694 } CLEANERINFO32; 695 __CTASSERT(sizeof(struct _cleanerinfo32) == 28); 696 697 typedef struct _cleanerinfo64 { 698 uint32_t clean; /* 0: number of clean segments */ 699 uint32_t dirty; /* 4: number of dirty segments */ 700 int64_t bfree; /* 8: disk blocks free */ 701 int64_t avail; /* 16: disk blocks available */ 702 uint64_t free_head; /* 24: head of the inode free list */ 703 uint64_t free_tail; /* 32: tail of the inode free list */ 704 uint32_t flags; /* 40: status word from the kernel */ 705 uint32_t pad; /* 44: must be 64-bit aligned */ 706 } __aligned(4) __packed CLEANERINFO64; 707 __CTASSERT(sizeof(struct _cleanerinfo64) == 48); 708 709 /* this must not go to disk directly of course */ 710 typedef union _cleanerinfo { 711 CLEANERINFO32 u_32; 712 CLEANERINFO64 u_64; 713 } CLEANERINFO; 714 #ifndef __lint__ 715 __CTASSERT(__alignof(union _cleanerinfo) == __alignof(struct _cleanerinfo32)); 716 __CTASSERT(__alignof(union _cleanerinfo) == __alignof(struct _cleanerinfo64)); 717 #endif 718 719 /* 720 * On-disk segment summary information 721 */ 722 723 /* magic value for ss_magic */ 724 #define SS_MAGIC 0x061561 725 726 /* flags for ss_flags */ 727 #define SS_DIROP 0x01 /* segment begins a dirop */ 728 #define SS_CONT 0x02 /* more partials to finish this write*/ 729 #define SS_CLEAN 0x04 /* written by the cleaner */ 730 #define SS_RFW 0x08 /* written by the roll-forward agent */ 731 #define SS_RECLAIM 0x10 /* written by the roll-forward agent */ 732 733 /* type used for reading checksum signatures from metadata structures */ 734 typedef uint32_t lfs_checkword; 735 736 typedef struct segsum_v1 SEGSUM_V1; 737 struct segsum_v1 { 738 uint32_t ss_sumsum; /* 0: check sum of summary block */ 739 uint32_t ss_datasum; /* 4: check sum of data */ 740 uint32_t ss_magic; /* 8: segment summary magic number */ 741 int32_t ss_next; /* 12: next segment */ 742 uint32_t ss_create; /* 16: creation time stamp */ 743 uint16_t ss_nfinfo; /* 20: number of file info structures */ 744 uint16_t ss_ninos; /* 22: number of inodes in summary */ 745 uint16_t ss_flags; /* 24: used for directory operations */ 746 uint16_t ss_pad; /* 26: extra space */ 747 /* FINFO's and inode daddr's... */ 748 }; 749 __CTASSERT(sizeof(struct segsum_v1) == 28); 750 751 typedef struct segsum32 SEGSUM32; 752 struct segsum32 { 753 uint32_t ss_sumsum; /* 0: check sum of summary block */ 754 uint32_t ss_datasum; /* 4: check sum of data */ 755 uint32_t ss_magic; /* 8: segment summary magic number */ 756 int32_t ss_next; /* 12: next segment (disk address) */ 757 uint32_t ss_ident; /* 16: roll-forward fsid */ 758 uint16_t ss_nfinfo; /* 20: number of file info structures */ 759 uint16_t ss_ninos; /* 22: number of inodes in summary */ 760 uint16_t ss_flags; /* 24: used for directory operations */ 761 uint8_t ss_pad[2]; /* 26: extra space */ 762 uint32_t ss_reclino; /* 28: inode being reclaimed */ 763 uint64_t ss_serial; /* 32: serial number */ 764 uint64_t ss_create; /* 40: time stamp */ 765 /* FINFO's and inode daddr's... */ 766 } __aligned(4) __packed; 767 __CTASSERT(sizeof(struct segsum32) == 48); 768 769 typedef struct segsum64 SEGSUM64; 770 struct segsum64 { 771 uint32_t ss_sumsum; /* 0: check sum of summary block */ 772 uint32_t ss_datasum; /* 4: check sum of data */ 773 uint32_t ss_magic; /* 8: segment summary magic number */ 774 uint32_t ss_ident; /* 12: roll-forward fsid */ 775 int64_t ss_next; /* 16: next segment (disk address) */ 776 uint16_t ss_nfinfo; /* 24: number of file info structures */ 777 uint16_t ss_ninos; /* 26: number of inodes in summary */ 778 uint16_t ss_flags; /* 28: used for directory operations */ 779 uint8_t ss_pad[2]; /* 30: extra space */ 780 uint64_t ss_reclino; /* 32: inode being reclaimed */ 781 uint64_t ss_serial; /* 40: serial number */ 782 uint64_t ss_create; /* 48: time stamp */ 783 /* FINFO's and inode daddr's... */ 784 } __aligned(4) __packed; 785 __CTASSERT(sizeof(struct segsum64) == 56); 786 787 typedef union segsum SEGSUM; 788 union segsum { 789 struct segsum64 u_64; 790 struct segsum32 u_32; 791 struct segsum_v1 u_v1; 792 }; 793 __CTASSERT(__alignof(union segsum) == __alignof(struct segsum64)); 794 __CTASSERT(__alignof(union segsum) == __alignof(struct segsum32)); 795 #ifndef __lint__ 796 __CTASSERT(__alignof(union segsum) == __alignof(struct segsum_v1)); 797 #endif 798 799 /* 800 * On-disk super block. 801 * 802 * We have separate superblock structures for the 32-bit and 64-bit 803 * LFS, and accessor functions to hide the differences. 804 * 805 * For lfs64, the format version is always 2; version 1 lfs is old. 806 * For both, the inode format version is 0; for lfs32 this selects the 807 * same 32-bit inode as always, and for lfs64 this selects the larger 808 * 64-bit inode structure we got from ffsv2. 809 * 810 * In lfs64: 811 * - inode numbers are 64 bit now 812 * - segments may not be larger than 4G (counted in bytes) 813 * - there may not be more than 2^32 (or perhaps 2^31) segments 814 * - the total volume size is limited to 2^63 frags and/or 2^63 815 * disk blocks, and probably in practice 2^63 bytes. 816 */ 817 818 #define LFS_MAGIC 0x070162 819 #define LFS_MAGIC_SWAPPED 0x62010700 820 821 #define LFS64_MAGIC (0x19620701 ^ 0xffffffff) 822 #define LFS64_MAGIC_SWAPPED (0x01076219 ^ 0xffffffff) 823 824 #define LFS_VERSION 2 825 826 #define LFS_MIN_SBINTERVAL 5 /* min superblock segment spacing */ 827 #define LFS_MAXNUMSB 10 /* max number of superblocks */ 828 829 /* flags for dlfs_pflags */ 830 #define LFS_PF_CLEAN 0x1 831 832 /* Inode format versions */ 833 #define LFS_44INODEFMT 0 834 #define LFS_MAXINODEFMT 0 835 836 struct dlfs { 837 uint32_t dlfs_magic; /* 0: magic number */ 838 uint32_t dlfs_version; /* 4: version number */ 839 840 uint32_t dlfs_size; /* 8: number of blocks in fs (v1) */ 841 /* number of frags in fs (v2) */ 842 uint32_t dlfs_ssize; /* 12: number of blocks per segment (v1) */ 843 /* number of bytes per segment (v2) */ 844 uint32_t dlfs_dsize; /* 16: number of disk blocks in fs */ 845 uint32_t dlfs_bsize; /* 20: file system block size */ 846 uint32_t dlfs_fsize; /* 24: size of frag blocks in fs */ 847 uint32_t dlfs_frag; /* 28: number of frags in a block in fs */ 848 849 /* Checkpoint region. */ 850 uint32_t dlfs_freehd; /* 32: start of the free inode list */ 851 int32_t dlfs_bfree; /* 36: number of free frags */ 852 uint32_t dlfs_nfiles; /* 40: number of allocated inodes */ 853 int32_t dlfs_avail; /* 44: blocks available for writing */ 854 int32_t dlfs_uinodes; /* 48: inodes in cache not yet on disk */ 855 int32_t dlfs_idaddr; /* 52: inode file disk address */ 856 uint32_t dlfs_ifile; /* 56: inode file inode number */ 857 int32_t dlfs_lastseg; /* 60: address of last segment written */ 858 int32_t dlfs_nextseg; /* 64: address of next segment to write */ 859 int32_t dlfs_curseg; /* 68: current segment being written */ 860 int32_t dlfs_offset; /* 72: offset in curseg for next partial */ 861 int32_t dlfs_lastpseg; /* 76: address of last partial written */ 862 uint32_t dlfs_inopf; /* 80: v1: time stamp; v2: inodes per frag */ 863 864 /* These are configuration parameters. */ 865 uint32_t dlfs_minfree; /* 84: minimum percentage of free blocks */ 866 867 /* These fields can be computed from the others. */ 868 uint64_t dlfs_maxfilesize; /* 88: maximum representable file size */ 869 uint32_t dlfs_fsbpseg; /* 96: frags (fsb) per segment */ 870 uint32_t dlfs_inopb; /* 100: inodes per block */ 871 uint32_t dlfs_ifpb; /* 104: IFILE entries per block */ 872 uint32_t dlfs_sepb; /* 108: SEGUSE entries per block */ 873 uint32_t dlfs_nindir; /* 112: indirect pointers per block */ 874 uint32_t dlfs_nseg; /* 116: number of segments */ 875 uint32_t dlfs_nspf; /* 120: number of sectors per fragment */ 876 uint32_t dlfs_cleansz; /* 124: cleaner info size in blocks */ 877 uint32_t dlfs_segtabsz; /* 128: segment table size in blocks */ 878 uint32_t dlfs_segmask; /* 132: calculate offset within a segment */ 879 uint32_t dlfs_segshift; /* 136: fast mult/div for segments */ 880 uint32_t dlfs_bshift; /* 140: calc block number from file offset */ 881 uint32_t dlfs_ffshift; /* 144: fast mult/div for frag from file */ 882 uint32_t dlfs_fbshift; /* 148: fast mult/div for frag from block */ 883 uint64_t dlfs_bmask; /* 152: calc block offset from file offset */ 884 uint64_t dlfs_ffmask; /* 160: calc frag offset from file offset */ 885 uint64_t dlfs_fbmask; /* 168: calc frag offset from block offset */ 886 uint32_t dlfs_blktodb; /* 176: blktodb and dbtoblk shift constant */ 887 uint32_t dlfs_sushift; /* 180: fast mult/div for segusage table */ 888 889 int32_t dlfs_maxsymlinklen; /* 184: max length of an internal symlink */ 890 /* 188: superblock disk offsets */ 891 int32_t dlfs_sboffs[LFS_MAXNUMSB]; 892 893 uint32_t dlfs_nclean; /* 228: Number of clean segments */ 894 u_char dlfs_fsmnt[MNAMELEN]; /* 232: name mounted on */ 895 uint16_t dlfs_pflags; /* 322: file system persistent flags */ 896 int32_t dlfs_dmeta; /* 324: total number of dirty summaries */ 897 uint32_t dlfs_minfreeseg; /* 328: segments not counted in bfree */ 898 uint32_t dlfs_sumsize; /* 332: size of summary blocks */ 899 uint64_t dlfs_serial; /* 336: serial number */ 900 uint32_t dlfs_ibsize; /* 344: size of inode blocks */ 901 int32_t dlfs_s0addr; /* 348: start of segment 0 */ 902 uint64_t dlfs_tstamp; /* 352: time stamp */ 903 uint32_t dlfs_inodefmt; /* 360: inode format version */ 904 uint32_t dlfs_interleave; /* 364: segment interleave */ 905 uint32_t dlfs_ident; /* 368: per-fs identifier */ 906 uint32_t dlfs_fsbtodb; /* 372: fsbtodb and dbtodsb shift constant */ 907 uint32_t dlfs_resvseg; /* 376: segments reserved for the cleaner */ 908 int8_t dlfs_pad[128]; /* 380: round to 512 bytes */ 909 /* Checksum -- last valid disk field. */ 910 uint32_t dlfs_cksum; /* 508: checksum for superblock checking */ 911 }; 912 913 struct dlfs64 { 914 uint32_t dlfs_magic; /* 0: magic number */ 915 uint32_t dlfs_version; /* 4: version number (2) */ 916 917 uint64_t dlfs_size; /* 8: number of frags in fs (v2) */ 918 uint64_t dlfs_dsize; /* 16: number of disk blocks in fs */ 919 uint32_t dlfs_ssize; /* 24: number of bytes per segment (v2) */ 920 uint32_t dlfs_bsize; /* 28: file system block size */ 921 uint32_t dlfs_fsize; /* 32: size of frag blocks in fs */ 922 uint32_t dlfs_frag; /* 36: number of frags in a block in fs */ 923 924 /* Checkpoint region. */ 925 uint64_t dlfs_freehd; /* 40: start of the free inode list */ 926 uint64_t dlfs_nfiles; /* 48: number of allocated inodes */ 927 int64_t dlfs_bfree; /* 56: number of free frags */ 928 int64_t dlfs_avail; /* 64: blocks available for writing */ 929 int64_t dlfs_idaddr; /* 72: inode file disk address */ 930 int32_t dlfs_uinodes; /* 80: inodes in cache not yet on disk */ 931 uint32_t dlfs_unused_0; /* 84: not used */ 932 int64_t dlfs_lastseg; /* 88: address of last segment written */ 933 int64_t dlfs_nextseg; /* 96: address of next segment to write */ 934 int64_t dlfs_curseg; /* 104: current segment being written */ 935 int64_t dlfs_offset; /* 112: offset in curseg for next partial */ 936 int64_t dlfs_lastpseg; /* 120: address of last partial written */ 937 uint32_t dlfs_inopf; /* 128: inodes per frag */ 938 939 /* These are configuration parameters. */ 940 uint32_t dlfs_minfree; /* 132: minimum percentage of free blocks */ 941 942 /* These fields can be computed from the others. */ 943 uint64_t dlfs_maxfilesize; /* 136: maximum representable file size */ 944 uint32_t dlfs_fsbpseg; /* 144: frags (fsb) per segment */ 945 uint32_t dlfs_inopb; /* 148: inodes per block */ 946 uint32_t dlfs_ifpb; /* 152: IFILE entries per block */ 947 uint32_t dlfs_sepb; /* 156: SEGUSE entries per block */ 948 uint32_t dlfs_nindir; /* 160: indirect pointers per block */ 949 uint32_t dlfs_nseg; /* 164: number of segments */ 950 uint32_t dlfs_nspf; /* 168: number of sectors per fragment */ 951 uint32_t dlfs_cleansz; /* 172: cleaner info size in blocks */ 952 uint32_t dlfs_segtabsz; /* 176: segment table size in blocks */ 953 uint32_t dlfs_bshift; /* 180: calc block number from file offset */ 954 uint32_t dlfs_ffshift; /* 184: fast mult/div for frag from file */ 955 uint32_t dlfs_fbshift; /* 188: fast mult/div for frag from block */ 956 uint64_t dlfs_bmask; /* 192: calc block offset from file offset */ 957 uint64_t dlfs_ffmask; /* 200: calc frag offset from file offset */ 958 uint64_t dlfs_fbmask; /* 208: calc frag offset from block offset */ 959 uint32_t dlfs_blktodb; /* 216: blktodb and dbtoblk shift constant */ 960 uint32_t dlfs_sushift; /* 220: fast mult/div for segusage table */ 961 962 /* 224: superblock disk offsets */ 963 int64_t dlfs_sboffs[LFS_MAXNUMSB]; 964 965 int32_t dlfs_maxsymlinklen; /* 304: max len of an internal symlink */ 966 uint32_t dlfs_nclean; /* 308: Number of clean segments */ 967 u_char dlfs_fsmnt[MNAMELEN]; /* 312: name mounted on */ 968 uint16_t dlfs_pflags; /* 402: file system persistent flags */ 969 int32_t dlfs_dmeta; /* 404: total number of dirty summaries */ 970 uint32_t dlfs_minfreeseg; /* 408: segments not counted in bfree */ 971 uint32_t dlfs_sumsize; /* 412: size of summary blocks */ 972 uint32_t dlfs_ibsize; /* 416: size of inode blocks */ 973 uint32_t dlfs_inodefmt; /* 420: inode format version */ 974 uint64_t dlfs_serial; /* 424: serial number */ 975 int64_t dlfs_s0addr; /* 432: start of segment 0 */ 976 uint64_t dlfs_tstamp; /* 440: time stamp */ 977 uint32_t dlfs_interleave; /* 448: segment interleave */ 978 uint32_t dlfs_ident; /* 452: per-fs identifier */ 979 uint32_t dlfs_fsbtodb; /* 456: fsbtodb and dbtodsb shift constant */ 980 uint32_t dlfs_resvseg; /* 460: segments reserved for the cleaner */ 981 int8_t dlfs_pad[44]; /* 464: round to 512 bytes */ 982 /* Checksum -- last valid disk field. */ 983 uint32_t dlfs_cksum; /* 508: checksum for superblock checking */ 984 }; 985 986 __CTASSERT(__alignof(struct dlfs) == __alignof(struct dlfs64)); 987 988 /* Type used for the inode bitmap */ 989 typedef uint32_t lfs_bm_t; 990 991 /* 992 * Linked list of segments whose byte count needs updating following a 993 * file truncation. 994 */ 995 struct segdelta { 996 long segnum; 997 size_t num; 998 LIST_ENTRY(segdelta) list; 999 }; 1000 1001 /* 1002 * In-memory super block. 1003 */ 1004 struct lfs { 1005 union { /* on-disk parameters */ 1006 struct dlfs u_32; 1007 struct dlfs64 u_64; 1008 } lfs_dlfs_u; 1009 1010 /* These fields are set at mount time and are meaningless on disk. */ 1011 unsigned lfs_is64 : 1, /* are we lfs64 or lfs32? */ 1012 lfs_dobyteswap : 1, /* are we opposite-endian? */ 1013 lfs_hasolddirfmt : 1; /* dir entries have no d_type */ 1014 1015 struct segment *lfs_sp; /* current segment being written */ 1016 struct vnode *lfs_ivnode; /* vnode for the ifile */ 1017 uint32_t lfs_seglock; /* single-thread the segment writer */ 1018 pid_t lfs_lockpid; /* pid of lock holder */ 1019 lwpid_t lfs_locklwp; /* lwp of lock holder */ 1020 uint32_t lfs_iocount; /* number of ios pending */ 1021 uint32_t lfs_writer; /* don't allow any dirops to start */ 1022 uint32_t lfs_dirops; /* count of active directory ops */ 1023 kcondvar_t lfs_diropscv; /* condvar of active directory ops */ 1024 uint32_t lfs_dirvcount; /* count of VDIROP nodes in this fs */ 1025 uint32_t lfs_doifile; /* Write ifile blocks on next write */ 1026 uint32_t lfs_nactive; /* Number of segments since last ckp */ 1027 int8_t lfs_fmod; /* super block modified flag */ 1028 int8_t lfs_ronly; /* mounted read-only flag */ 1029 #define LFS_NOTYET 0x01 1030 #define LFS_IFDIRTY 0x02 1031 #define LFS_WARNED 0x04 1032 #define LFS_UNDIROP 0x08 1033 int8_t lfs_flags; /* currently unused flag */ 1034 uint16_t lfs_activesb; /* toggle between superblocks */ 1035 daddr_t lfs_sbactive; /* disk address of current sb write */ 1036 struct vnode *lfs_flushvp; /* vnode being flushed */ 1037 int lfs_flushvp_fakevref; /* fake vref count for flushvp */ 1038 struct vnode *lfs_unlockvp; /* being inactivated in lfs_segunlock */ 1039 uint32_t lfs_diropwait; /* # procs waiting on dirop flush */ 1040 size_t lfs_devbsize; /* Device block size */ 1041 size_t lfs_devbshift; /* Device block shift */ 1042 krwlock_t lfs_fraglock; 1043 krwlock_t lfs_iflock; /* Ifile lock */ 1044 kcondvar_t lfs_stopcv; /* Wrap lock */ 1045 struct lwp *lfs_stoplwp; 1046 pid_t lfs_rfpid; /* Process ID of roll-forward agent */ 1047 int lfs_nadirop; /* number of active dirop nodes */ 1048 long lfs_ravail; /* blocks pre-reserved for writing */ 1049 long lfs_favail; /* blocks pre-reserved for writing */ 1050 struct lfs_res_blk *lfs_resblk; /* Reserved memory for pageout */ 1051 TAILQ_HEAD(, inode) lfs_dchainhd; /* dirop vnodes */ 1052 TAILQ_HEAD(, inode) lfs_pchainhd; /* paging vnodes */ 1053 #define LFS_RESHASH_WIDTH 17 1054 LIST_HEAD(, lfs_res_blk) lfs_reshash[LFS_RESHASH_WIDTH]; 1055 int lfs_pdflush; /* pagedaemon wants us to flush */ 1056 uint32_t **lfs_suflags; /* Segment use flags */ 1057 #ifdef _KERNEL 1058 struct pool lfs_clpool; /* Pool for struct lfs_cluster */ 1059 struct pool lfs_bpppool; /* Pool for bpp */ 1060 struct pool lfs_segpool; /* Pool for struct segment */ 1061 #endif /* _KERNEL */ 1062 #define LFS_MAX_CLEANIND 64 1063 daddr_t lfs_cleanint[LFS_MAX_CLEANIND]; /* Active cleaning intervals */ 1064 int lfs_cleanind; /* Index into intervals */ 1065 int lfs_sleepers; /* # procs sleeping this fs */ 1066 kcondvar_t lfs_sleeperscv; 1067 int lfs_pages; /* dirty pages blaming this fs */ 1068 lfs_bm_t *lfs_ino_bitmap; /* Inuse inodes bitmap */ 1069 int lfs_nowrap; /* Suspend log wrap */ 1070 int lfs_wrappass; /* Allow first log wrap requester to pass */ 1071 int lfs_wrapstatus; /* Wrap status */ 1072 int lfs_reclino; /* Inode being reclaimed */ 1073 daddr_t lfs_startseg; /* Segment we started writing at */ 1074 LIST_HEAD(, segdelta) lfs_segdhd; /* List of pending trunc accounting events */ 1075 1076 #ifdef _KERNEL 1077 /* The block device we're mounted on. */ 1078 dev_t lfs_dev; 1079 struct vnode *lfs_devvp; 1080 1081 /* ULFS-level information */ 1082 uint32_t um_flags; /* ULFS flags (below) */ 1083 u_long um_nindir; /* indirect ptrs per block */ 1084 u_long um_lognindir; /* log2 of um_nindir */ 1085 u_long um_bptrtodb; /* indir ptr to disk block */ 1086 u_long um_seqinc; /* inc between seq blocks */ 1087 int um_maxsymlinklen; 1088 int um_dirblksiz; 1089 uint64_t um_maxfilesize; 1090 1091 /* Stuff used by quota2 code, not currently operable */ 1092 unsigned lfs_use_quota2 : 1; 1093 uint32_t lfs_quota_magic; 1094 uint8_t lfs_quota_flags; 1095 uint64_t lfs_quotaino[2]; 1096 1097 /* Sleep address replacing &lfs_avail inside the on-disk superblock */ 1098 /* XXX: should be replaced with a condvar */ 1099 int lfs_availsleep; 1100 /* This one replaces &lfs_nextseg... all ditto */ 1101 kcondvar_t lfs_nextsegsleep; 1102 1103 /* Cleaner lwp, set on first bmapv syscall. */ 1104 struct lwp *lfs_cleaner_thread; 1105 1106 /* Hint from cleaner, only valid if curlwp == um_cleaner_thread. */ 1107 /* XXX change this to BLOCK_INFO after resorting this file */ 1108 struct block_info *lfs_cleaner_hint; 1109 #endif 1110 }; 1111 1112 /* 1113 * Structures used by lfs_bmapv and lfs_markv to communicate information 1114 * about inodes and data blocks. 1115 */ 1116 typedef struct block_info { 1117 uint64_t bi_inode; /* inode # */ 1118 int64_t bi_lbn; /* logical block w/in file */ 1119 int64_t bi_daddr; /* disk address of block */ 1120 uint64_t bi_segcreate; /* origin segment create time */ 1121 int bi_version; /* file version number */ 1122 int bi_size; /* size of the block (if fragment) */ 1123 void *bi_bp; /* data buffer */ 1124 } BLOCK_INFO; 1125 1126 /* Compatibility for 7.0 binaries */ 1127 typedef struct block_info_70 { 1128 uint32_t bi_inode; /* inode # */ 1129 int32_t bi_lbn; /* logical block w/in file */ 1130 int32_t bi_daddr; /* disk address of block */ 1131 uint64_t bi_segcreate; /* origin segment create time */ 1132 int bi_version; /* file version number */ 1133 void *bi_bp; /* data buffer */ 1134 int bi_size; /* size of the block (if fragment) */ 1135 } BLOCK_INFO_70; 1136 1137 /* Compatibility for 1.5 binaries */ 1138 typedef struct block_info_15 { 1139 uint32_t bi_inode; /* inode # */ 1140 int32_t bi_lbn; /* logical block w/in file */ 1141 int32_t bi_daddr; /* disk address of block */ 1142 uint32_t bi_segcreate; /* origin segment create time */ 1143 int bi_version; /* file version number */ 1144 void *bi_bp; /* data buffer */ 1145 int bi_size; /* size of the block (if fragment) */ 1146 } BLOCK_INFO_15; 1147 1148 /* 1149 * 32/64-bit-clean pointer to block pointers. This points into 1150 * already-existing storage; it is mostly used to access the block 1151 * pointers following a FINFO. 1152 */ 1153 union lfs_blocks { 1154 int64_t *b64; 1155 int32_t *b32; 1156 }; 1157 1158 /* In-memory description of a segment about to be written. */ 1159 struct segment { 1160 struct lfs *fs; /* file system pointer */ 1161 struct buf **bpp; /* pointer to buffer array */ 1162 struct buf **cbpp; /* pointer to next available bp */ 1163 struct buf **start_bpp; /* pointer to first bp in this set */ 1164 struct buf *ibp; /* buffer pointer to inode page */ 1165 union lfs_dinode *idp; /* pointer to ifile dinode */ 1166 FINFO *fip; /* current fileinfo pointer */ 1167 struct vnode *vp; /* vnode being gathered */ 1168 void *segsum; /* segment summary info */ 1169 uint32_t ninodes; /* number of inodes in this segment */ 1170 int32_t seg_bytes_left; /* bytes left in segment */ 1171 int32_t sum_bytes_left; /* bytes left in summary block */ 1172 uint32_t seg_number; /* number of this segment */ 1173 union lfs_blocks start_lbp; /* beginning lbn for this set */ 1174 1175 #define SEGM_CKP 0x0001 /* doing a checkpoint */ 1176 #define SEGM_CLEAN 0x0002 /* cleaner call; don't sort */ 1177 #define SEGM_SYNC 0x0004 /* wait for segment */ 1178 #define SEGM_PROT 0x0008 /* don't inactivate at segunlock */ 1179 #define SEGM_PAGEDAEMON 0x0010 /* pagedaemon called us */ 1180 #define SEGM_WRITERD 0x0020 /* LFS writed called us */ 1181 #define SEGM_FORCE_CKP 0x0040 /* Force checkpoint right away */ 1182 #define SEGM_RECLAIM 0x0080 /* Writing to reclaim vnode */ 1183 #define SEGM_SINGLE 0x0100 /* Opportunistic writevnodes */ 1184 uint16_t seg_flags; /* run-time flags for this segment */ 1185 uint32_t seg_iocount; /* number of ios pending */ 1186 int ndupino; /* number of duplicate inodes */ 1187 }; 1188 1189 /* Statistics Counters */ 1190 struct lfs_stats { /* Must match sysctl list in lfs_vfsops.h ! */ 1191 u_int segsused; 1192 u_int psegwrites; 1193 u_int psyncwrites; 1194 u_int pcleanwrites; 1195 u_int blocktot; 1196 u_int cleanblocks; 1197 u_int ncheckpoints; 1198 u_int nwrites; 1199 u_int nsync_writes; 1200 u_int wait_exceeded; 1201 u_int write_exceeded; 1202 u_int flush_invoked; 1203 u_int vflush_invoked; 1204 u_int clean_inlocked; 1205 u_int clean_vnlocked; 1206 u_int segs_reclaimed; 1207 }; 1208 1209 /* Fcntls to take the place of the lfs syscalls */ 1210 struct lfs_fcntl_markv { 1211 BLOCK_INFO *blkiov; /* blocks to relocate */ 1212 int blkcnt; /* number of blocks (limited to 65536) */ 1213 }; 1214 1215 #define LFCNSEGWAITALL _FCNR_FSPRIV('L', 14, struct timeval) 1216 #define LFCNSEGWAIT _FCNR_FSPRIV('L', 15, struct timeval) 1217 #define LFCNBMAPV _FCNRW_FSPRIV('L', 16, struct lfs_fcntl_markv) 1218 #define LFCNMARKV _FCNRW_FSPRIV('L', 17, struct lfs_fcntl_markv) 1219 #define LFCNRECLAIM _FCNO_FSPRIV('L', 4) 1220 1221 struct lfs_fhandle { 1222 char space[28]; /* FHANDLE_SIZE_COMPAT (but used from userland too) */ 1223 }; 1224 #define LFCNREWIND _FCNR_FSPRIV('L', 6, int) 1225 #define LFCNINVAL _FCNR_FSPRIV('L', 7, int) 1226 #define LFCNRESIZE _FCNR_FSPRIV('L', 8, int) 1227 #define LFCNWRAPSTOP _FCNR_FSPRIV('L', 9, int) 1228 #define LFCNWRAPGO _FCNR_FSPRIV('L', 10, int) 1229 #define LFCNIFILEFH _FCNW_FSPRIV('L', 11, struct lfs_fhandle) 1230 #define LFCNWRAPPASS _FCNR_FSPRIV('L', 12, int) 1231 # define LFS_WRAP_GOING 0x0 1232 # define LFS_WRAP_WAITING 0x1 1233 #define LFCNWRAPSTATUS _FCNW_FSPRIV('L', 13, int) 1234 1235 /* Debug segment lock */ 1236 #ifdef notyet 1237 # define ASSERT_SEGLOCK(fs) KASSERT(LFS_SEGLOCK_HELD(fs)) 1238 # define ASSERT_NO_SEGLOCK(fs) KASSERT(!LFS_SEGLOCK_HELD(fs)) 1239 # define ASSERT_DUNNO_SEGLOCK(fs) 1240 # define ASSERT_MAYBE_SEGLOCK(fs) 1241 #else /* !notyet */ 1242 # define ASSERT_DUNNO_SEGLOCK(fs) \ 1243 DLOG((DLOG_SEG, "lfs func %s seglock wrong (%d)\n", __func__, \ 1244 LFS_SEGLOCK_HELD(fs))) 1245 # define ASSERT_SEGLOCK(fs) do { \ 1246 if (!LFS_SEGLOCK_HELD(fs)) { \ 1247 DLOG((DLOG_SEG, "lfs func %s seglock wrong (0)\n", __func__)); \ 1248 } \ 1249 } while(0) 1250 # define ASSERT_NO_SEGLOCK(fs) do { \ 1251 if (LFS_SEGLOCK_HELD(fs)) { \ 1252 DLOG((DLOG_SEG, "lfs func %s seglock wrong (1)\n", __func__)); \ 1253 } \ 1254 } while(0) 1255 # define ASSERT_MAYBE_SEGLOCK(x) 1256 #endif /* !notyet */ 1257 1258 /* 1259 * Arguments to mount LFS filesystems 1260 */ 1261 struct ulfs_args { 1262 char *fspec; /* block special device to mount */ 1263 }; 1264 1265 __BEGIN_DECLS 1266 void lfs_itimes(struct inode *, const struct timespec *, 1267 const struct timespec *, const struct timespec *); 1268 __END_DECLS 1269 1270 #endif /* !_UFS_LFS_LFS_H_ */ 1271
Indexes created Tue Sep 30 20:09:53 GMT 2025