1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1982, 1986, 1989, 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 32 #include <sys/param.h> 33 #include <sys/endian.h> 34 #include <sys/limits.h> 35 36 #ifndef _KERNEL 37 #include <stdbool.h> 38 #include <stdio.h> 39 #include <string.h> 40 #include <stdlib.h> 41 #include <time.h> 42 #include <sys/errno.h> 43 #include <ufs/ufs/dinode.h> 44 #include <ufs/ffs/fs.h> 45 46 uint32_t calculate_crc32c(uint32_t, const void *, size_t); 47 uint32_t ffs_calc_sbhash(struct fs *); 48 struct malloc_type; 49 #define UFS_MALLOC(size, type, flags) malloc(size) 50 #define UFS_FREE(ptr, type) free(ptr) 51 #define maxphys MAXPHYS 52 53 #else /* _KERNEL */ 54 #include <sys/systm.h> 55 #include <sys/gsb_crc32.h> 56 #include <sys/lock.h> 57 #include <sys/malloc.h> 58 #include <sys/mount.h> 59 #include <sys/vnode.h> 60 #include <sys/bio.h> 61 #include <sys/buf.h> 62 #include <sys/ucred.h> 63 #include <sys/sysctl.h> 64 65 #include <ufs/ufs/quota.h> 66 #include <ufs/ufs/inode.h> 67 #include <ufs/ufs/extattr.h> 68 #include <ufs/ufs/ufsmount.h> 69 #include <ufs/ufs/ufs_extern.h> 70 #include <ufs/ffs/ffs_extern.h> 71 #include <ufs/ffs/fs.h> 72 73 #define UFS_MALLOC(size, type, flags) malloc(size, type, flags) 74 #define UFS_FREE(ptr, type) free(ptr, type) 75 76 #endif /* _KERNEL */ 77 78 /* 79 * Verify an inode check-hash. 80 */ 81 int 82 ffs_verify_dinode_ckhash(struct fs *fs, struct ufs2_dinode *dip) 83 { 84 uint32_t ckhash, save_ckhash; 85 86 /* 87 * Return success if unallocated or we are not doing inode check-hash. 88 */ 89 if (dip->di_mode == 0 || (fs->fs_metackhash & CK_INODE) == 0) 90 return (0); 91 /* 92 * Exclude di_ckhash from the crc32 calculation, e.g., always use 93 * a check-hash value of zero when calculating the check-hash. 94 */ 95 save_ckhash = dip->di_ckhash; 96 dip->di_ckhash = 0; 97 ckhash = calculate_crc32c(~0L, (void *)dip, sizeof(*dip)); 98 dip->di_ckhash = save_ckhash; 99 if (save_ckhash == ckhash) 100 return (0); 101 return (EINVAL); 102 } 103 104 /* 105 * Update an inode check-hash. 106 */ 107 void 108 ffs_update_dinode_ckhash(struct fs *fs, struct ufs2_dinode *dip) 109 { 110 111 if (dip->di_mode == 0 || (fs->fs_metackhash & CK_INODE) == 0) 112 return; 113 /* 114 * Exclude old di_ckhash from the crc32 calculation, e.g., always use 115 * a check-hash value of zero when calculating the new check-hash. 116 */ 117 dip->di_ckhash = 0; 118 dip->di_ckhash = calculate_crc32c(~0L, (void *)dip, sizeof(*dip)); 119 } 120 121 /* 122 * These are the low-level functions that actually read and write 123 * the superblock and its associated data. 124 */ 125 static off_t sblock_try[] = SBLOCKSEARCH; 126 static int readsuper(void *, struct fs **, off_t, int, 127 int (*)(void *, off_t, void **, int)); 128 static void ffs_oldfscompat_read(struct fs *, ufs2_daddr_t); 129 static int validate_sblock(struct fs *, int); 130 131 /* 132 * Read a superblock from the devfd device. 133 * 134 * If an alternate superblock is specified, it is read. Otherwise the 135 * set of locations given in the SBLOCKSEARCH list is searched for a 136 * superblock. Memory is allocated for the superblock by the readfunc and 137 * is returned. If filltype is non-NULL, additional memory is allocated 138 * of type filltype and filled in with the superblock summary information. 139 * All memory is freed when any error is returned. 140 * 141 * If a superblock is found, zero is returned. Otherwise one of the 142 * following error values is returned: 143 * EIO: non-existent or truncated superblock. 144 * EIO: error reading summary information. 145 * ENOENT: no usable known superblock found. 146 * EILSEQ: filesystem with wrong byte order found. 147 * ENOMEM: failed to allocate space for the superblock. 148 * EINVAL: The previous newfs operation on this volume did not complete. 149 * The administrator must complete newfs before using this volume. 150 */ 151 int 152 ffs_sbget(void *devfd, struct fs **fsp, off_t sblock, int flags, 153 struct malloc_type *filltype, 154 int (*readfunc)(void *devfd, off_t loc, void **bufp, int size)) 155 { 156 struct fs *fs; 157 struct fs_summary_info *fs_si; 158 int i, error; 159 uint64_t size, blks; 160 uint8_t *space; 161 int32_t *lp; 162 char *buf; 163 164 fs = NULL; 165 *fsp = NULL; 166 if (sblock != UFS_STDSB) { 167 if ((error = readsuper(devfd, &fs, sblock, 168 flags | UFS_ALTSBLK, readfunc)) != 0) { 169 if (fs != NULL) 170 UFS_FREE(fs, filltype); 171 return (error); 172 } 173 } else { 174 for (i = 0; sblock_try[i] != -1; i++) { 175 if ((error = readsuper(devfd, &fs, sblock_try[i], 176 flags, readfunc)) == 0) { 177 if ((flags & UFS_NOCSUM) != 0) { 178 *fsp = fs; 179 return (0); 180 } 181 break; 182 } 183 if (fs != NULL) { 184 UFS_FREE(fs, filltype); 185 fs = NULL; 186 } 187 if (error == ENOENT) 188 continue; 189 return (error); 190 } 191 if (sblock_try[i] == -1) 192 return (ENOENT); 193 } 194 /* 195 * Read in the superblock summary information. 196 */ 197 size = fs->fs_cssize; 198 blks = howmany(size, fs->fs_fsize); 199 if (fs->fs_contigsumsize > 0) 200 size += fs->fs_ncg * sizeof(int32_t); 201 size += fs->fs_ncg * sizeof(uint8_t); 202 if ((fs_si = UFS_MALLOC(sizeof(*fs_si), filltype, M_NOWAIT)) == NULL) { 203 UFS_FREE(fs, filltype); 204 return (ENOMEM); 205 } 206 bzero(fs_si, sizeof(*fs_si)); 207 fs->fs_si = fs_si; 208 if ((space = UFS_MALLOC(size, filltype, M_NOWAIT)) == NULL) { 209 UFS_FREE(fs->fs_si, filltype); 210 UFS_FREE(fs, filltype); 211 return (ENOMEM); 212 } 213 fs->fs_csp = (struct csum *)space; 214 for (i = 0; i < blks; i += fs->fs_frag) { 215 size = fs->fs_bsize; 216 if (i + fs->fs_frag > blks) 217 size = (blks - i) * fs->fs_fsize; 218 buf = NULL; 219 error = (*readfunc)(devfd, 220 dbtob(fsbtodb(fs, fs->fs_csaddr + i)), (void **)&buf, size); 221 if (error) { 222 if (buf != NULL) 223 UFS_FREE(buf, filltype); 224 UFS_FREE(fs->fs_csp, filltype); 225 UFS_FREE(fs->fs_si, filltype); 226 UFS_FREE(fs, filltype); 227 return (error); 228 } 229 memcpy(space, buf, size); 230 UFS_FREE(buf, filltype); 231 space += size; 232 } 233 if (fs->fs_contigsumsize > 0) { 234 fs->fs_maxcluster = lp = (int32_t *)space; 235 for (i = 0; i < fs->fs_ncg; i++) 236 *lp++ = fs->fs_contigsumsize; 237 space = (uint8_t *)lp; 238 } 239 size = fs->fs_ncg * sizeof(uint8_t); 240 fs->fs_contigdirs = (uint8_t *)space; 241 bzero(fs->fs_contigdirs, size); 242 *fsp = fs; 243 return (0); 244 } 245 246 /* 247 * Try to read a superblock from the location specified by sblockloc. 248 * Return zero on success or an errno on failure. 249 */ 250 static int 251 readsuper(void *devfd, struct fs **fsp, off_t sblockloc, int flags, 252 int (*readfunc)(void *devfd, off_t loc, void **bufp, int size)) 253 { 254 struct fs *fs; 255 int error, res; 256 uint32_t ckhash; 257 258 error = (*readfunc)(devfd, sblockloc, (void **)fsp, SBLOCKSIZE); 259 if (error != 0) 260 return (error); 261 fs = *fsp; 262 if (fs->fs_magic == FS_BAD_MAGIC) 263 return (EINVAL); 264 /* 265 * For UFS1 with a 65536 block size, the first backup superblock 266 * is at the same location as the UFS2 superblock. Since SBLOCK_UFS2 267 * is the first location checked, the first backup is the superblock 268 * that will be accessed. Here we fail the lookup so that we can 269 * retry with the correct location for the UFS1 superblock. 270 */ 271 if (fs->fs_magic == FS_UFS1_MAGIC && (flags & UFS_ALTSBLK) == 0 && 272 fs->fs_bsize == SBLOCK_UFS2 && sblockloc == SBLOCK_UFS2) 273 return (ENOENT); 274 ffs_oldfscompat_read(fs, sblockloc); 275 if ((error = validate_sblock(fs, flags)) > 0) 276 return (error); 277 /* 278 * If the filesystem has been run on a kernel without 279 * metadata check hashes, disable them. 280 */ 281 if ((fs->fs_flags & FS_METACKHASH) == 0) 282 fs->fs_metackhash = 0; 283 /* 284 * Clear any check-hashes that are not maintained 285 * by this kernel. Also clear any unsupported flags. 286 */ 287 fs->fs_metackhash &= CK_SUPPORTED; 288 fs->fs_flags &= FS_SUPPORTED; 289 if (fs->fs_ckhash != (ckhash = ffs_calc_sbhash(fs))) { 290 if ((flags & (UFS_NOMSG | UFS_NOHASHFAIL)) == 291 (UFS_NOMSG | UFS_NOHASHFAIL)) 292 return (0); 293 if ((flags & UFS_NOMSG) != 0) 294 return (EINTEGRITY); 295 #ifdef _KERNEL 296 res = uprintf("Superblock check-hash failed: recorded " 297 "check-hash 0x%x != computed check-hash 0x%x%s\n", 298 fs->fs_ckhash, ckhash, 299 (flags & UFS_NOHASHFAIL) != 0 ? " (Ignored)" : ""); 300 #else 301 res = 0; 302 #endif 303 /* 304 * Print check-hash failure if no controlling terminal 305 * in kernel or always if in user-mode (libufs). 306 */ 307 if (res == 0) 308 printf("Superblock check-hash failed: recorded " 309 "check-hash 0x%x != computed check-hash " 310 "0x%x%s\n", fs->fs_ckhash, ckhash, 311 (flags & UFS_NOHASHFAIL) ? " (Ignored)" : ""); 312 if ((flags & UFS_NOHASHFAIL) != 0) 313 return (0); 314 return (EINTEGRITY); 315 } 316 /* Have to set for old filesystems that predate this field */ 317 fs->fs_sblockactualloc = sblockloc; 318 /* Not yet any summary information */ 319 fs->fs_si = NULL; 320 return (0); 321 } 322 323 /* 324 * Sanity checks for loading old filesystem superblocks. 325 * See ffs_oldfscompat_write below for unwound actions. 326 * 327 * XXX - Parts get retired eventually. 328 * Unfortunately new bits get added. 329 */ 330 static void 331 ffs_oldfscompat_read(struct fs *fs, ufs2_daddr_t sblockloc) 332 { 333 uint64_t maxfilesize; 334 335 /* 336 * If not yet done, update fs_flags location and value of fs_sblockloc. 337 */ 338 if ((fs->fs_old_flags & FS_FLAGS_UPDATED) == 0) { 339 fs->fs_flags = fs->fs_old_flags; 340 fs->fs_old_flags |= FS_FLAGS_UPDATED; 341 fs->fs_sblockloc = sblockloc; 342 } 343 switch (fs->fs_magic) { 344 case FS_UFS2_MAGIC: 345 /* No changes for now */ 346 break; 347 348 case FS_UFS1_MAGIC: 349 /* 350 * If not yet done, update UFS1 superblock with new wider fields 351 */ 352 if (fs->fs_maxbsize != fs->fs_bsize) { 353 fs->fs_maxbsize = fs->fs_bsize; 354 fs->fs_time = fs->fs_old_time; 355 fs->fs_size = fs->fs_old_size; 356 fs->fs_dsize = fs->fs_old_dsize; 357 fs->fs_csaddr = fs->fs_old_csaddr; 358 fs->fs_cstotal.cs_ndir = fs->fs_old_cstotal.cs_ndir; 359 fs->fs_cstotal.cs_nbfree = fs->fs_old_cstotal.cs_nbfree; 360 fs->fs_cstotal.cs_nifree = fs->fs_old_cstotal.cs_nifree; 361 fs->fs_cstotal.cs_nffree = fs->fs_old_cstotal.cs_nffree; 362 } 363 if (fs->fs_old_inodefmt < FS_44INODEFMT) { 364 fs->fs_maxfilesize = ((uint64_t)1 << 31) - 1; 365 fs->fs_qbmask = ~fs->fs_bmask; 366 fs->fs_qfmask = ~fs->fs_fmask; 367 } 368 fs->fs_save_maxfilesize = fs->fs_maxfilesize; 369 maxfilesize = (uint64_t)0x80000000 * fs->fs_bsize - 1; 370 if (fs->fs_maxfilesize > maxfilesize) 371 fs->fs_maxfilesize = maxfilesize; 372 break; 373 } 374 /* Compatibility for old filesystems */ 375 if (fs->fs_avgfilesize <= 0) 376 fs->fs_avgfilesize = AVFILESIZ; 377 if (fs->fs_avgfpdir <= 0) 378 fs->fs_avgfpdir = AFPDIR; 379 } 380 381 /* 382 * Unwinding superblock updates for old filesystems. 383 * See ffs_oldfscompat_read above for details. 384 * 385 * XXX - Parts get retired eventually. 386 * Unfortunately new bits get added. 387 */ 388 void 389 ffs_oldfscompat_write(struct fs *fs) 390 { 391 392 switch (fs->fs_magic) { 393 case FS_UFS1_MAGIC: 394 if (fs->fs_sblockloc != SBLOCK_UFS1 && 395 (fs->fs_old_flags & FS_FLAGS_UPDATED) == 0) { 396 printf( 397 "WARNING: %s: correcting fs_sblockloc from %jd to %d\n", 398 fs->fs_fsmnt, fs->fs_sblockloc, SBLOCK_UFS1); 399 fs->fs_sblockloc = SBLOCK_UFS1; 400 } 401 /* 402 * Copy back UFS2 updated fields that UFS1 inspects. 403 */ 404 fs->fs_old_time = fs->fs_time; 405 fs->fs_old_cstotal.cs_ndir = fs->fs_cstotal.cs_ndir; 406 fs->fs_old_cstotal.cs_nbfree = fs->fs_cstotal.cs_nbfree; 407 fs->fs_old_cstotal.cs_nifree = fs->fs_cstotal.cs_nifree; 408 fs->fs_old_cstotal.cs_nffree = fs->fs_cstotal.cs_nffree; 409 if (fs->fs_save_maxfilesize != 0) 410 fs->fs_maxfilesize = fs->fs_save_maxfilesize; 411 break; 412 case FS_UFS2_MAGIC: 413 if (fs->fs_sblockloc != SBLOCK_UFS2 && 414 (fs->fs_old_flags & FS_FLAGS_UPDATED) == 0) { 415 printf( 416 "WARNING: %s: correcting fs_sblockloc from %jd to %d\n", 417 fs->fs_fsmnt, fs->fs_sblockloc, SBLOCK_UFS2); 418 fs->fs_sblockloc = SBLOCK_UFS2; 419 } 420 break; 421 } 422 } 423 424 /* 425 * Sanity checks for loading old filesystem inodes. 426 * 427 * XXX - Parts get retired eventually. 428 * Unfortunately new bits get added. 429 */ 430 static int prttimechgs = 0; 431 #ifdef _KERNEL 432 SYSCTL_NODE(_vfs, OID_AUTO, ffs, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 433 "FFS filesystem"); 434 SYSCTL_INT(_vfs_ffs, OID_AUTO, prttimechgs, CTLFLAG_RWTUN, &prttimechgs, 0, 435 "print UFS1 time changes made to inodes"); 436 #endif /* _KERNEL */ 437 bool 438 ffs_oldfscompat_inode_read(struct fs *fs, union dinodep dp, time_t now) 439 { 440 bool change; 441 442 change = false; 443 switch (fs->fs_magic) { 444 case FS_UFS2_MAGIC: 445 /* No changes for now */ 446 break; 447 448 case FS_UFS1_MAGIC: 449 /* 450 * With the change to unsigned time values in UFS1, times set 451 * before Jan 1, 1970 will appear to be in the future. Check 452 * for future times and set them to be the current time. 453 */ 454 if (dp.dp1->di_ctime > now) { 455 if (prttimechgs) 456 printf("ctime %ud changed to %ld\n", 457 dp.dp1->di_ctime, (long)now); 458 dp.dp1->di_ctime = now; 459 change = true; 460 } 461 if (dp.dp1->di_mtime > now) { 462 if (prttimechgs) 463 printf("mtime %ud changed to %ld\n", 464 dp.dp1->di_mtime, (long)now); 465 dp.dp1->di_mtime = now; 466 dp.dp1->di_ctime = now; 467 change = true; 468 } 469 if (dp.dp1->di_atime > now) { 470 if (prttimechgs) 471 printf("atime %ud changed to %ld\n", 472 dp.dp1->di_atime, (long)now); 473 dp.dp1->di_atime = now; 474 dp.dp1->di_ctime = now; 475 change = true; 476 } 477 break; 478 } 479 return (change); 480 } 481 482 /* 483 * Verify the filesystem values. 484 */ 485 #define ILOG2(num) (fls(num) - 1) 486 #ifdef STANDALONE_SMALL 487 #define MPRINT(...) do { } while (0) 488 #else 489 #define MPRINT(...) if (prtmsg) printf(__VA_ARGS__) 490 #endif 491 #define FCHK(lhs, op, rhs, fmt) \ 492 if (lhs op rhs) { \ 493 MPRINT("UFS%d superblock failed: %s (" #fmt ") %s %s (" \ 494 #fmt ")\n", fs->fs_magic == FS_UFS1_MAGIC ? 1 : 2, \ 495 #lhs, (intmax_t)lhs, #op, #rhs, (intmax_t)rhs); \ 496 if (error < 0) \ 497 return (ENOENT); \ 498 if (error == 0) \ 499 error = ENOENT; \ 500 } 501 #define WCHK(lhs, op, rhs, fmt) \ 502 if (lhs op rhs) { \ 503 MPRINT("UFS%d superblock failed: %s (" #fmt ") %s %s (" \ 504 #fmt ")%s\n", fs->fs_magic == FS_UFS1_MAGIC ? 1 : 2,\ 505 #lhs, (intmax_t)lhs, #op, #rhs, (intmax_t)rhs, wmsg);\ 506 if (error == 0) \ 507 error = warnerr; \ 508 if (warnerr == 0) \ 509 lhs = rhs; \ 510 } 511 #define FCHK2(lhs1, op1, rhs1, lhs2, op2, rhs2, fmt) \ 512 if (lhs1 op1 rhs1 && lhs2 op2 rhs2) { \ 513 MPRINT("UFS%d superblock failed: %s (" #fmt ") %s %s (" \ 514 #fmt ") && %s (" #fmt ") %s %s (" #fmt ")\n", \ 515 fs->fs_magic == FS_UFS1_MAGIC ? 1 : 2, #lhs1, \ 516 (intmax_t)lhs1, #op1, #rhs1, (intmax_t)rhs1, #lhs2, \ 517 (intmax_t)lhs2, #op2, #rhs2, (intmax_t)rhs2); \ 518 if (error < 0) \ 519 return (ENOENT); \ 520 if (error == 0) \ 521 error = ENOENT; \ 522 } 523 524 static int 525 validate_sblock(struct fs *fs, int flags) 526 { 527 uint64_t i, sectorsize; 528 uint64_t maxfilesize, sizepb; 529 int error, prtmsg, warnerr; 530 char *wmsg; 531 532 error = 0; 533 sectorsize = dbtob(1); 534 prtmsg = ((flags & UFS_NOMSG) == 0); 535 warnerr = (flags & UFS_NOWARNFAIL) == UFS_NOWARNFAIL ? 0 : ENOENT; 536 wmsg = warnerr ? "" : " (Ignored)"; 537 /* 538 * Check for endian mismatch between machine and filesystem. 539 */ 540 if (((fs->fs_magic != FS_UFS2_MAGIC) && 541 (bswap32(fs->fs_magic) == FS_UFS2_MAGIC)) || 542 ((fs->fs_magic != FS_UFS1_MAGIC) && 543 (bswap32(fs->fs_magic) == FS_UFS1_MAGIC))) { 544 MPRINT("UFS superblock failed due to endian mismatch " 545 "between machine and filesystem\n"); 546 return(EILSEQ); 547 } 548 /* 549 * If just validating for recovery, then do just the minimal 550 * checks needed for the superblock fields needed to find 551 * alternate superblocks. 552 */ 553 if ((flags & UFS_FSRONLY) == UFS_FSRONLY && 554 (fs->fs_magic == FS_UFS1_MAGIC || fs->fs_magic == FS_UFS2_MAGIC)) { 555 error = -1; /* fail on first error */ 556 if (fs->fs_magic == FS_UFS2_MAGIC) { 557 FCHK(fs->fs_sblockloc, !=, SBLOCK_UFS2, %#jx); 558 } else if (fs->fs_magic == FS_UFS1_MAGIC) { 559 FCHK(fs->fs_sblockloc, <, 0, %jd); 560 FCHK(fs->fs_sblockloc, >, SBLOCK_UFS1, %jd); 561 } 562 FCHK(fs->fs_frag, <, 1, %jd); 563 FCHK(fs->fs_frag, >, MAXFRAG, %jd); 564 FCHK(fs->fs_bsize, <, MINBSIZE, %jd); 565 FCHK(fs->fs_bsize, >, MAXBSIZE, %jd); 566 FCHK(fs->fs_bsize, <, roundup(sizeof(struct fs), DEV_BSIZE), 567 %jd); 568 FCHK(fs->fs_fsize, <, sectorsize, %jd); 569 FCHK(fs->fs_fsize * fs->fs_frag, !=, fs->fs_bsize, %jd); 570 FCHK(powerof2(fs->fs_fsize), ==, 0, %jd); 571 FCHK(fs->fs_sbsize, >, SBLOCKSIZE, %jd); 572 FCHK(fs->fs_sbsize, <, (signed)sizeof(struct fs), %jd); 573 FCHK(fs->fs_sbsize % sectorsize, !=, 0, %jd); 574 FCHK(fs->fs_fpg, <, 3 * fs->fs_frag, %jd); 575 FCHK(fs->fs_ncg, <, 1, %jd); 576 FCHK(fs->fs_fsbtodb, !=, ILOG2(fs->fs_fsize / sectorsize), %jd); 577 FCHK(fs->fs_old_cgoffset, <, 0, %jd); 578 FCHK2(fs->fs_old_cgoffset, >, 0, ~fs->fs_old_cgmask, <, 0, %jd); 579 FCHK(fs->fs_old_cgoffset * (~fs->fs_old_cgmask), >, fs->fs_fpg, 580 %jd); 581 FCHK(fs->fs_sblkno, !=, roundup( 582 howmany(fs->fs_sblockloc + SBLOCKSIZE, fs->fs_fsize), 583 fs->fs_frag), %jd); 584 FCHK(CGSIZE(fs), >, fs->fs_bsize, %jd); 585 /* Only need to validate these if reading in csum data */ 586 if ((flags & UFS_NOCSUM) != 0) 587 return (error); 588 FCHK((uint64_t)fs->fs_ipg * fs->fs_ncg, >, 589 (((int64_t)(1)) << 32) - INOPB(fs), %jd); 590 FCHK(fs->fs_cstotal.cs_nifree, <, 0, %jd); 591 FCHK(fs->fs_cstotal.cs_nifree, >, 592 (uint64_t)fs->fs_ipg * fs->fs_ncg, %jd); 593 FCHK(fs->fs_cstotal.cs_ndir, >, 594 ((uint64_t)fs->fs_ipg * fs->fs_ncg) - 595 fs->fs_cstotal.cs_nifree, %jd); 596 FCHK(fs->fs_size, <, 8 * fs->fs_frag, %jd); 597 FCHK(fs->fs_size, <=, ((int64_t)fs->fs_ncg - 1) * fs->fs_fpg, 598 %jd); 599 FCHK(fs->fs_size, >, (int64_t)fs->fs_ncg * fs->fs_fpg, %jd); 600 FCHK(fs->fs_csaddr, <, 0, %jd); 601 FCHK(fs->fs_cssize, !=, 602 fragroundup(fs, fs->fs_ncg * sizeof(struct csum)), %jd); 603 FCHK(fs->fs_csaddr + howmany(fs->fs_cssize, fs->fs_fsize), >, 604 fs->fs_size, %jd); 605 FCHK(fs->fs_csaddr, <, cgdmin(fs, dtog(fs, fs->fs_csaddr)), 606 %jd); 607 FCHK(dtog(fs, fs->fs_csaddr + howmany(fs->fs_cssize, 608 fs->fs_fsize)), >, dtog(fs, fs->fs_csaddr), %jd); 609 return (error); 610 } 611 if (fs->fs_magic == FS_UFS2_MAGIC) { 612 if ((flags & UFS_ALTSBLK) == 0) 613 FCHK2(fs->fs_sblockactualloc, !=, SBLOCK_UFS2, 614 fs->fs_sblockactualloc, !=, 0, %jd); 615 FCHK(fs->fs_sblockloc, !=, SBLOCK_UFS2, %#jx); 616 FCHK(fs->fs_maxsymlinklen, !=, ((UFS_NDADDR + UFS_NIADDR) * 617 sizeof(ufs2_daddr_t)), %jd); 618 FCHK(fs->fs_nindir, !=, fs->fs_bsize / sizeof(ufs2_daddr_t), 619 %jd); 620 FCHK(fs->fs_inopb, !=, 621 fs->fs_bsize / sizeof(struct ufs2_dinode), %jd); 622 } else if (fs->fs_magic == FS_UFS1_MAGIC) { 623 if ((flags & UFS_ALTSBLK) == 0) 624 FCHK(fs->fs_sblockactualloc, >, SBLOCK_UFS1, %jd); 625 FCHK(fs->fs_sblockloc, <, 0, %jd); 626 FCHK(fs->fs_sblockloc, >, SBLOCK_UFS1, %jd); 627 FCHK(fs->fs_nindir, !=, fs->fs_bsize / sizeof(ufs1_daddr_t), 628 %jd); 629 FCHK(fs->fs_inopb, !=, 630 fs->fs_bsize / sizeof(struct ufs1_dinode), %jd); 631 FCHK(fs->fs_maxsymlinklen, !=, ((UFS_NDADDR + UFS_NIADDR) * 632 sizeof(ufs1_daddr_t)), %jd); 633 WCHK(fs->fs_old_inodefmt, !=, FS_44INODEFMT, %jd); 634 WCHK(fs->fs_old_rotdelay, !=, 0, %jd); 635 WCHK(fs->fs_old_rps, !=, 60, %jd); 636 WCHK(fs->fs_old_nspf, !=, fs->fs_fsize / sectorsize, %jd); 637 WCHK(fs->fs_old_interleave, !=, 1, %jd); 638 WCHK(fs->fs_old_trackskew, !=, 0, %jd); 639 WCHK(fs->fs_old_cpc, !=, 0, %jd); 640 WCHK(fs->fs_old_postblformat, !=, 1, %jd); 641 FCHK(fs->fs_old_nrpos, !=, 1, %jd); 642 WCHK(fs->fs_old_nsect, !=, fs->fs_old_spc, %jd); 643 WCHK(fs->fs_old_npsect, !=, fs->fs_old_spc, %jd); 644 } else { 645 /* Bad magic number, so assume not a superblock */ 646 return (ENOENT); 647 } 648 FCHK(fs->fs_bsize, <, MINBSIZE, %jd); 649 FCHK(fs->fs_bsize, >, MAXBSIZE, %jd); 650 FCHK(fs->fs_bsize, <, roundup(sizeof(struct fs), DEV_BSIZE), %jd); 651 FCHK(powerof2(fs->fs_bsize), ==, 0, %jd); 652 FCHK(fs->fs_frag, <, 1, %jd); 653 FCHK(fs->fs_frag, >, MAXFRAG, %jd); 654 FCHK(fs->fs_frag, !=, numfrags(fs, fs->fs_bsize), %jd); 655 FCHK(fs->fs_fsize, <, sectorsize, %jd); 656 FCHK(fs->fs_fsize * fs->fs_frag, !=, fs->fs_bsize, %jd); 657 FCHK(powerof2(fs->fs_fsize), ==, 0, %jd); 658 FCHK(fs->fs_fpg, <, 3 * fs->fs_frag, %jd); 659 FCHK(fs->fs_ncg, <, 1, %jd); 660 FCHK(fs->fs_ipg, <, fs->fs_inopb, %jd); 661 FCHK((uint64_t)fs->fs_ipg * fs->fs_ncg, >, 662 (((int64_t)(1)) << 32) - INOPB(fs), %jd); 663 FCHK(fs->fs_cstotal.cs_nifree, <, 0, %jd); 664 FCHK(fs->fs_cstotal.cs_nifree, >, (uint64_t)fs->fs_ipg * fs->fs_ncg, 665 %jd); 666 FCHK(fs->fs_cstotal.cs_ndir, <, 0, %jd); 667 FCHK(fs->fs_cstotal.cs_ndir, >, 668 ((uint64_t)fs->fs_ipg * fs->fs_ncg) - fs->fs_cstotal.cs_nifree, 669 %jd); 670 FCHK(fs->fs_sbsize, >, SBLOCKSIZE, %jd); 671 FCHK(fs->fs_sbsize, <, (signed)sizeof(struct fs), %jd); 672 /* fix for misconfigured filesystems */ 673 if (fs->fs_maxbsize == 0) 674 fs->fs_maxbsize = fs->fs_bsize; 675 FCHK(fs->fs_maxbsize, <, fs->fs_bsize, %jd); 676 FCHK(powerof2(fs->fs_maxbsize), ==, 0, %jd); 677 FCHK(fs->fs_maxbsize, >, FS_MAXCONTIG * fs->fs_bsize, %jd); 678 FCHK(fs->fs_bmask, !=, ~(fs->fs_bsize - 1), %#jx); 679 FCHK(fs->fs_fmask, !=, ~(fs->fs_fsize - 1), %#jx); 680 FCHK(fs->fs_qbmask, !=, ~fs->fs_bmask, %#jx); 681 FCHK(fs->fs_qfmask, !=, ~fs->fs_fmask, %#jx); 682 FCHK(fs->fs_bshift, !=, ILOG2(fs->fs_bsize), %jd); 683 FCHK(fs->fs_fshift, !=, ILOG2(fs->fs_fsize), %jd); 684 FCHK(fs->fs_fragshift, !=, ILOG2(fs->fs_frag), %jd); 685 FCHK(fs->fs_fsbtodb, !=, ILOG2(fs->fs_fsize / sectorsize), %jd); 686 FCHK(fs->fs_old_cgoffset, <, 0, %jd); 687 FCHK2(fs->fs_old_cgoffset, >, 0, ~fs->fs_old_cgmask, <, 0, %jd); 688 FCHK(fs->fs_old_cgoffset * (~fs->fs_old_cgmask), >, fs->fs_fpg, %jd); 689 FCHK(CGSIZE(fs), >, fs->fs_bsize, %jd); 690 /* 691 * If anything has failed up to this point, it is usafe to proceed 692 * as checks below may divide by zero or make other fatal calculations. 693 * So if we have any errors at this point, give up. 694 */ 695 if (error) 696 return (error); 697 FCHK(fs->fs_sbsize % sectorsize, !=, 0, %jd); 698 FCHK(fs->fs_ipg % fs->fs_inopb, !=, 0, %jd); 699 FCHK(fs->fs_sblkno, !=, roundup( 700 howmany(fs->fs_sblockloc + SBLOCKSIZE, fs->fs_fsize), 701 fs->fs_frag), %jd); 702 FCHK(fs->fs_cblkno, !=, fs->fs_sblkno + 703 roundup(howmany(SBLOCKSIZE, fs->fs_fsize), fs->fs_frag), %jd); 704 FCHK(fs->fs_iblkno, !=, fs->fs_cblkno + fs->fs_frag, %jd); 705 FCHK(fs->fs_dblkno, !=, fs->fs_iblkno + fs->fs_ipg / INOPF(fs), %jd); 706 FCHK(fs->fs_cgsize, >, fs->fs_bsize, %jd); 707 FCHK(fs->fs_cgsize, <, fs->fs_fsize, %jd); 708 FCHK(fs->fs_cgsize % fs->fs_fsize, !=, 0, %jd); 709 /* 710 * This test is valid, however older versions of growfs failed 711 * to correctly update fs_dsize so will fail this test. Thus we 712 * exclude it from the requirements. 713 */ 714 #ifdef notdef 715 WCHK(fs->fs_dsize, !=, fs->fs_size - fs->fs_sblkno - 716 fs->fs_ncg * (fs->fs_dblkno - fs->fs_sblkno) - 717 howmany(fs->fs_cssize, fs->fs_fsize), %jd); 718 #endif 719 WCHK(fs->fs_metaspace, <, 0, %jd); 720 WCHK(fs->fs_metaspace, >, fs->fs_fpg / 2, %jd); 721 WCHK(fs->fs_minfree, >, 99, %jd%%); 722 maxfilesize = fs->fs_bsize * UFS_NDADDR - 1; 723 for (sizepb = fs->fs_bsize, i = 0; i < UFS_NIADDR; i++) { 724 sizepb *= NINDIR(fs); 725 maxfilesize += sizepb; 726 } 727 WCHK(fs->fs_maxfilesize, >, maxfilesize, %jd); 728 /* 729 * These values have a tight interaction with each other that 730 * makes it hard to tightly bound them. So we can only check 731 * that they are within a broader possible range. 732 * 733 * The size cannot always be accurately determined, but ensure 734 * that it is consistent with the number of cylinder groups (fs_ncg) 735 * and the number of fragments per cylinder group (fs_fpg). Ensure 736 * that the summary information size is correct and that it starts 737 * and ends in the data area of the same cylinder group. 738 */ 739 FCHK(fs->fs_size, <, 8 * fs->fs_frag, %jd); 740 FCHK(fs->fs_size, <=, ((int64_t)fs->fs_ncg - 1) * fs->fs_fpg, %jd); 741 FCHK(fs->fs_size, >, (int64_t)fs->fs_ncg * fs->fs_fpg, %jd); 742 /* 743 * If we are not requested to read in the csum data stop here 744 * as the correctness of the remaining values is only important 745 * to bound the space needed to be allocated to hold the csum data. 746 */ 747 if ((flags & UFS_NOCSUM) != 0) 748 return (error); 749 FCHK(fs->fs_csaddr, <, 0, %jd); 750 FCHK(fs->fs_cssize, !=, 751 fragroundup(fs, fs->fs_ncg * sizeof(struct csum)), %jd); 752 FCHK(fs->fs_csaddr + howmany(fs->fs_cssize, fs->fs_fsize), >, 753 fs->fs_size, %jd); 754 FCHK(fs->fs_csaddr, <, cgdmin(fs, dtog(fs, fs->fs_csaddr)), %jd); 755 FCHK(dtog(fs, fs->fs_csaddr + howmany(fs->fs_cssize, fs->fs_fsize)), >, 756 dtog(fs, fs->fs_csaddr), %jd); 757 /* 758 * With file system clustering it is possible to allocate 759 * many contiguous blocks. The kernel variable maxphys defines 760 * the maximum transfer size permitted by the controller and/or 761 * buffering. The fs_maxcontig parameter controls the maximum 762 * number of blocks that the filesystem will read or write 763 * in a single transfer. It is calculated when the filesystem 764 * is created as maxphys / fs_bsize. The loader uses a maxphys 765 * of 128K even when running on a system that supports larger 766 * values. If the filesystem was built on a system that supports 767 * a larger maxphys (1M is typical) it will have configured 768 * fs_maxcontig for that larger system. So we bound the upper 769 * allowable limit for fs_maxconfig to be able to at least 770 * work with a 1M maxphys on the smallest block size filesystem: 771 * 1M / 4096 == 256. There is no harm in allowing the mounting of 772 * filesystems that make larger than maxphys I/O requests because 773 * those (mostly 32-bit machines) can (very slowly) handle I/O 774 * requests that exceed maxphys. 775 */ 776 WCHK(fs->fs_maxcontig, <, 0, %jd); 777 WCHK(fs->fs_maxcontig, >, MAX(256, maxphys / fs->fs_bsize), %jd); 778 FCHK2(fs->fs_maxcontig, ==, 0, fs->fs_contigsumsize, !=, 0, %jd); 779 FCHK2(fs->fs_maxcontig, >, 1, fs->fs_contigsumsize, !=, 780 MIN(fs->fs_maxcontig, FS_MAXCONTIG), %jd); 781 return (error); 782 } 783 784 /* 785 * Make an extensive search to find a superblock. If the superblock 786 * in the standard place cannot be used, try looking for one of the 787 * backup superblocks. 788 * 789 * Flags are made up of the following or'ed together options: 790 * 791 * UFS_NOMSG indicates that superblock inconsistency error messages 792 * should not be printed. 793 * 794 * UFS_NOCSUM causes only the superblock itself to be returned, but does 795 * not read in any auxillary data structures like the cylinder group 796 * summary information. 797 */ 798 int 799 ffs_sbsearch(void *devfd, struct fs **fsp, int reqflags, 800 struct malloc_type *filltype, 801 int (*readfunc)(void *devfd, off_t loc, void **bufp, int size)) 802 { 803 struct fsrecovery *fsr; 804 struct fs *protofs; 805 void *fsrbuf; 806 char *cp; 807 long nocsum, flags, msg, cg; 808 off_t sblk, secsize; 809 int error; 810 811 msg = (reqflags & UFS_NOMSG) == 0; 812 nocsum = reqflags & UFS_NOCSUM; 813 /* 814 * Try normal superblock read and return it if it works. 815 * 816 * Suppress messages if it fails until we find out if 817 * failure can be avoided. 818 */ 819 flags = UFS_NOMSG | nocsum; 820 error = ffs_sbget(devfd, fsp, UFS_STDSB, flags, filltype, readfunc); 821 /* 822 * If successful or endian error, no need to try further. 823 */ 824 if (error == 0 || error == EILSEQ) { 825 if (msg && error == EILSEQ) 826 printf("UFS superblock failed due to endian mismatch " 827 "between machine and filesystem\n"); 828 return (error); 829 } 830 /* 831 * First try: ignoring hash failures. 832 */ 833 flags |= UFS_NOHASHFAIL; 834 if (msg) 835 flags &= ~UFS_NOMSG; 836 if (ffs_sbget(devfd, fsp, UFS_STDSB, flags, filltype, readfunc) == 0) 837 return (0); 838 /* 839 * Next up is to check if fields of the superblock that are 840 * needed to find backup superblocks are usable. 841 */ 842 if (msg) 843 printf("Attempted recovery for standard superblock: failed\n"); 844 flags = UFS_FSRONLY | UFS_NOHASHFAIL | UFS_NOCSUM | UFS_NOMSG; 845 if (ffs_sbget(devfd, &protofs, UFS_STDSB, flags, filltype, 846 readfunc) == 0) { 847 if (msg) 848 printf("Attempt extraction of recovery data from " 849 "standard superblock.\n"); 850 } else { 851 /* 852 * Final desperation is to see if alternate superblock 853 * parameters have been saved in the boot area. 854 */ 855 if (msg) 856 printf("Attempted extraction of recovery data from " 857 "standard superblock: failed\nAttempt to find " 858 "boot zone recovery data.\n"); 859 /* 860 * Look to see if recovery information has been saved. 861 * If so we can generate a prototype superblock based 862 * on that information. 863 * 864 * We need fragments-per-group, number of cylinder groups, 865 * location of the superblock within the cylinder group, and 866 * the conversion from filesystem fragments to disk blocks. 867 * 868 * When building a UFS2 filesystem, newfs(8) stores these 869 * details at the end of the boot block area at the start 870 * of the filesystem partition. If they have been overwritten 871 * by a boot block, we fail. But usually they are there 872 * and we can use them. 873 * 874 * We could ask the underlying device for its sector size, 875 * but some devices lie. So we just try a plausible range. 876 */ 877 error = ENOENT; 878 fsrbuf = NULL; 879 for (secsize = dbtob(1); secsize <= SBLOCKSIZE; secsize *= 2) 880 if ((error = (*readfunc)(devfd, (SBLOCK_UFS2 - secsize), 881 &fsrbuf, secsize)) == 0) 882 break; 883 if (error != 0) 884 goto trynowarn; 885 cp = fsrbuf; /* type change to keep compiler happy */ 886 fsr = (struct fsrecovery *)&cp[secsize - sizeof *fsr]; 887 if (fsr->fsr_magic != FS_UFS2_MAGIC || 888 (protofs = UFS_MALLOC(SBLOCKSIZE, filltype, M_NOWAIT)) 889 == NULL) { 890 UFS_FREE(fsrbuf, filltype); 891 goto trynowarn; 892 } 893 memset(protofs, 0, sizeof(struct fs)); 894 protofs->fs_fpg = fsr->fsr_fpg; 895 protofs->fs_fsbtodb = fsr->fsr_fsbtodb; 896 protofs->fs_sblkno = fsr->fsr_sblkno; 897 protofs->fs_magic = fsr->fsr_magic; 898 protofs->fs_ncg = fsr->fsr_ncg; 899 UFS_FREE(fsrbuf, filltype); 900 } 901 /* 902 * Scan looking for alternative superblocks. 903 */ 904 flags = nocsum; 905 if (!msg) 906 flags |= UFS_NOMSG; 907 for (cg = 0; cg < protofs->fs_ncg; cg++) { 908 sblk = fsbtodb(protofs, cgsblock(protofs, cg)); 909 if (msg) 910 printf("Try cg %ld at sblock loc %jd\n", cg, 911 (intmax_t)sblk); 912 if (ffs_sbget(devfd, fsp, dbtob(sblk), flags, filltype, 913 readfunc) == 0) { 914 if (msg) 915 printf("Succeeded with alternate superblock " 916 "at %jd\n", (intmax_t)sblk); 917 UFS_FREE(protofs, filltype); 918 return (0); 919 } 920 } 921 UFS_FREE(protofs, filltype); 922 /* 923 * Our alternate superblock strategies failed. Our last ditch effort 924 * is to see if the standard superblock has only non-critical errors. 925 */ 926 trynowarn: 927 flags = UFS_NOWARNFAIL | UFS_NOMSG | nocsum; 928 if (msg) { 929 printf("Finding an alternate superblock failed.\nCheck for " 930 "only non-critical errors in standard superblock\n"); 931 flags &= ~UFS_NOMSG; 932 } 933 if (ffs_sbget(devfd, fsp, UFS_STDSB, flags, filltype, readfunc) != 0) { 934 if (msg) 935 printf("Failed, superblock has critical errors\n"); 936 return (ENOENT); 937 } 938 if (msg) 939 printf("Success, using standard superblock with " 940 "non-critical errors.\n"); 941 return (0); 942 } 943 944 /* 945 * Write a superblock to the devfd device from the memory pointed to by fs. 946 * Write out the superblock summary information if it is present. 947 * 948 * If the write is successful, zero is returned. Otherwise one of the 949 * following error values is returned: 950 * EIO: failed to write superblock. 951 * EIO: failed to write superblock summary information. 952 */ 953 int 954 ffs_sbput(void *devfd, struct fs *fs, off_t loc, 955 int (*writefunc)(void *devfd, off_t loc, void *buf, int size)) 956 { 957 struct fs_summary_info *fs_si; 958 int i, error, blks, size; 959 uint8_t *space; 960 961 /* 962 * If there is summary information, write it first, so if there 963 * is an error, the superblock will not be marked as clean. 964 */ 965 if (fs->fs_si != NULL && fs->fs_csp != NULL) { 966 blks = howmany(fs->fs_cssize, fs->fs_fsize); 967 space = (uint8_t *)fs->fs_csp; 968 for (i = 0; i < blks; i += fs->fs_frag) { 969 size = fs->fs_bsize; 970 if (i + fs->fs_frag > blks) 971 size = (blks - i) * fs->fs_fsize; 972 if ((error = (*writefunc)(devfd, 973 dbtob(fsbtodb(fs, fs->fs_csaddr + i)), 974 space, size)) != 0) 975 return (error); 976 space += size; 977 } 978 } 979 fs->fs_fmod = 0; 980 ffs_oldfscompat_write(fs); 981 #ifdef _KERNEL 982 fs->fs_time = time_second; 983 #else /* User Code */ 984 fs->fs_time = time(NULL); 985 #endif 986 /* Clear the pointers for the duration of writing. */ 987 fs_si = fs->fs_si; 988 fs->fs_si = NULL; 989 fs->fs_ckhash = ffs_calc_sbhash(fs); 990 error = (*writefunc)(devfd, loc, fs, fs->fs_sbsize); 991 /* 992 * A negative error code is returned when a copy of the 993 * superblock has been made which is discarded when the I/O 994 * is done. So the fs_si field does not and indeed cannot be 995 * restored after the write is done. Convert the error code 996 * back to its usual positive value when returning it. 997 */ 998 if (error < 0) 999 return (-error - 1); 1000 fs->fs_si = fs_si; 1001 return (error); 1002 } 1003 1004 /* 1005 * Calculate the check-hash for a superblock. 1006 */ 1007 uint32_t 1008 ffs_calc_sbhash(struct fs *fs) 1009 { 1010 uint32_t ckhash, save_ckhash; 1011 1012 /* 1013 * A filesystem that was using a superblock ckhash may be moved 1014 * to an older kernel that does not support ckhashes. The 1015 * older kernel will clear the FS_METACKHASH flag indicating 1016 * that it does not update hashes. When the disk is moved back 1017 * to a kernel capable of ckhashes it disables them on mount: 1018 * 1019 * if ((fs->fs_flags & FS_METACKHASH) == 0) 1020 * fs->fs_metackhash = 0; 1021 * 1022 * This leaves (fs->fs_metackhash & CK_SUPERBLOCK) == 0) with an 1023 * old stale value in the fs->fs_ckhash field. Thus the need to 1024 * just accept what is there. 1025 */ 1026 if ((fs->fs_metackhash & CK_SUPERBLOCK) == 0) 1027 return (fs->fs_ckhash); 1028 1029 save_ckhash = fs->fs_ckhash; 1030 fs->fs_ckhash = 0; 1031 /* 1032 * If newly read from disk, the caller is responsible for 1033 * verifying that fs->fs_sbsize <= SBLOCKSIZE. 1034 */ 1035 ckhash = calculate_crc32c(~0L, (void *)fs, fs->fs_sbsize); 1036 fs->fs_ckhash = save_ckhash; 1037 return (ckhash); 1038 } 1039 1040 /* 1041 * Update the frsum fields to reflect addition or deletion 1042 * of some frags. 1043 */ 1044 void 1045 ffs_fragacct(struct fs *fs, int fragmap, int32_t fraglist[], int cnt) 1046 { 1047 int inblk; 1048 int field, subfield; 1049 int siz, pos; 1050 1051 inblk = (int)(fragtbl[fs->fs_frag][fragmap]) << 1; 1052 fragmap <<= 1; 1053 for (siz = 1; siz < fs->fs_frag; siz++) { 1054 if ((inblk & (1 << (siz + (fs->fs_frag % NBBY)))) == 0) 1055 continue; 1056 field = around[siz]; 1057 subfield = inside[siz]; 1058 for (pos = siz; pos <= fs->fs_frag; pos++) { 1059 if ((fragmap & field) == subfield) { 1060 fraglist[siz] += cnt; 1061 pos += siz; 1062 field <<= siz; 1063 subfield <<= siz; 1064 } 1065 field <<= 1; 1066 subfield <<= 1; 1067 } 1068 } 1069 } 1070 1071 /* 1072 * block operations 1073 * 1074 * check if a block is available 1075 */ 1076 int 1077 ffs_isblock(struct fs *fs, unsigned char *cp, ufs1_daddr_t h) 1078 { 1079 unsigned char mask; 1080 1081 switch ((int)fs->fs_frag) { 1082 case 8: 1083 return (cp[h] == 0xff); 1084 case 4: 1085 mask = 0x0f << ((h & 0x1) << 2); 1086 return ((cp[h >> 1] & mask) == mask); 1087 case 2: 1088 mask = 0x03 << ((h & 0x3) << 1); 1089 return ((cp[h >> 2] & mask) == mask); 1090 case 1: 1091 mask = 0x01 << (h & 0x7); 1092 return ((cp[h >> 3] & mask) == mask); 1093 default: 1094 #ifdef _KERNEL 1095 panic("ffs_isblock"); 1096 #endif 1097 break; 1098 } 1099 return (0); 1100 } 1101 1102 /* 1103 * check if a block is free 1104 */ 1105 int 1106 ffs_isfreeblock(struct fs *fs, uint8_t *cp, ufs1_daddr_t h) 1107 { 1108 1109 switch ((int)fs->fs_frag) { 1110 case 8: 1111 return (cp[h] == 0); 1112 case 4: 1113 return ((cp[h >> 1] & (0x0f << ((h & 0x1) << 2))) == 0); 1114 case 2: 1115 return ((cp[h >> 2] & (0x03 << ((h & 0x3) << 1))) == 0); 1116 case 1: 1117 return ((cp[h >> 3] & (0x01 << (h & 0x7))) == 0); 1118 default: 1119 #ifdef _KERNEL 1120 panic("ffs_isfreeblock"); 1121 #endif 1122 break; 1123 } 1124 return (0); 1125 } 1126 1127 /* 1128 * take a block out of the map 1129 */ 1130 void 1131 ffs_clrblock(struct fs *fs, uint8_t *cp, ufs1_daddr_t h) 1132 { 1133 1134 switch ((int)fs->fs_frag) { 1135 case 8: 1136 cp[h] = 0; 1137 return; 1138 case 4: 1139 cp[h >> 1] &= ~(0x0f << ((h & 0x1) << 2)); 1140 return; 1141 case 2: 1142 cp[h >> 2] &= ~(0x03 << ((h & 0x3) << 1)); 1143 return; 1144 case 1: 1145 cp[h >> 3] &= ~(0x01 << (h & 0x7)); 1146 return; 1147 default: 1148 #ifdef _KERNEL 1149 panic("ffs_clrblock"); 1150 #endif 1151 break; 1152 } 1153 } 1154 1155 /* 1156 * put a block into the map 1157 */ 1158 void 1159 ffs_setblock(struct fs *fs, unsigned char *cp, ufs1_daddr_t h) 1160 { 1161 1162 switch ((int)fs->fs_frag) { 1163 case 8: 1164 cp[h] = 0xff; 1165 return; 1166 case 4: 1167 cp[h >> 1] |= (0x0f << ((h & 0x1) << 2)); 1168 return; 1169 case 2: 1170 cp[h >> 2] |= (0x03 << ((h & 0x3) << 1)); 1171 return; 1172 case 1: 1173 cp[h >> 3] |= (0x01 << (h & 0x7)); 1174 return; 1175 default: 1176 #ifdef _KERNEL 1177 panic("ffs_setblock"); 1178 #endif 1179 break; 1180 } 1181 } 1182 1183 /* 1184 * Update the cluster map because of an allocation or free. 1185 * 1186 * Cnt == 1 means free; cnt == -1 means allocating. 1187 */ 1188 void 1189 ffs_clusteracct(struct fs *fs, struct cg *cgp, ufs1_daddr_t blkno, int cnt) 1190 { 1191 int32_t *sump; 1192 int32_t *lp; 1193 uint8_t *freemapp, *mapp; 1194 int i, start, end, forw, back, map; 1195 uint64_t bit; 1196 1197 if (fs->fs_contigsumsize <= 0) 1198 return; 1199 freemapp = cg_clustersfree(cgp); 1200 sump = cg_clustersum(cgp); 1201 /* 1202 * Allocate or clear the actual block. 1203 */ 1204 if (cnt > 0) 1205 setbit(freemapp, blkno); 1206 else 1207 clrbit(freemapp, blkno); 1208 /* 1209 * Find the size of the cluster going forward. 1210 */ 1211 start = blkno + 1; 1212 end = start + fs->fs_contigsumsize; 1213 if (end >= cgp->cg_nclusterblks) 1214 end = cgp->cg_nclusterblks; 1215 mapp = &freemapp[start / NBBY]; 1216 map = *mapp++; 1217 bit = 1U << (start % NBBY); 1218 for (i = start; i < end; i++) { 1219 if ((map & bit) == 0) 1220 break; 1221 if ((i & (NBBY - 1)) != (NBBY - 1)) { 1222 bit <<= 1; 1223 } else { 1224 map = *mapp++; 1225 bit = 1; 1226 } 1227 } 1228 forw = i - start; 1229 /* 1230 * Find the size of the cluster going backward. 1231 */ 1232 start = blkno - 1; 1233 end = start - fs->fs_contigsumsize; 1234 if (end < 0) 1235 end = -1; 1236 mapp = &freemapp[start / NBBY]; 1237 map = *mapp--; 1238 bit = 1U << (start % NBBY); 1239 for (i = start; i > end; i--) { 1240 if ((map & bit) == 0) 1241 break; 1242 if ((i & (NBBY - 1)) != 0) { 1243 bit >>= 1; 1244 } else { 1245 map = *mapp--; 1246 bit = 1U << (NBBY - 1); 1247 } 1248 } 1249 back = start - i; 1250 /* 1251 * Account for old cluster and the possibly new forward and 1252 * back clusters. 1253 */ 1254 i = back + forw + 1; 1255 if (i > fs->fs_contigsumsize) 1256 i = fs->fs_contigsumsize; 1257 sump[i] += cnt; 1258 if (back > 0) 1259 sump[back] -= cnt; 1260 if (forw > 0) 1261 sump[forw] -= cnt; 1262 /* 1263 * Update cluster summary information. 1264 */ 1265 lp = &sump[fs->fs_contigsumsize]; 1266 for (i = fs->fs_contigsumsize; i > 0; i--) 1267 if (*lp-- > 0) 1268 break; 1269 fs->fs_maxcluster[cgp->cg_cgx] = i; 1270 } 1271