1 /*
2 * Copyright (c) 1980, 1986, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 4. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30 #if 0
31 #ifndef lint
32 static const char sccsid[] = "@(#)setup.c 8.10 (Berkeley) 5/9/95";
33 #endif /* not lint */
34 #endif
35 #include <sys/cdefs.h>
36 __FBSDID("$FreeBSD$");
37
38 #include <sys/param.h>
39 #include <sys/stat.h>
40 #define FSTYPENAMES
41 #include <sys/disklabel.h>
42 #include <sys/file.h>
43 #include <sys/sysctl.h>
44
45 #include <ufs/ufs/dinode.h>
46 #include <ufs/ffs/fs.h>
47
48 #include <ctype.h>
49 #include <err.h>
50 #include <errno.h>
51 #include <limits.h>
52 #include <stdint.h>
53 #include <string.h>
54
55 #include "fsck.h"
56
57 struct bufarea asblk;
58 #define altsblock (*asblk.b_un.b_fs)
59 #define POWEROF2(num) (((num) & ((num) - 1)) == 0)
60
61 static void badsb(int listerr, const char *s);
62 static int calcsb(char *dev, int devfd, struct fs *fs);
63 static struct disklabel *getdisklabel(char *s, int fd);
64
65 /*
66 * Read in a superblock finding an alternate if necessary.
67 * Return 1 if successful, 0 if unsuccessful, -1 if file system
68 * is already clean (ckclean and preen mode only).
69 */
70 int
setup(char * dev)71 setup(char *dev)
72 {
73 long cg, asked, i, j;
74 long bmapsize;
75 struct stat statb;
76 struct fs proto;
77 size_t size;
78
79 havesb = 0;
80 fswritefd = -1;
81 cursnapshot = 0;
82 if (stat(dev, &statb) < 0) {
83 printf("Can't stat %s: %s\n", dev, strerror(errno));
84 if (bkgrdflag) {
85 unlink(snapname);
86 bkgrdflag = 0;
87 }
88 return (0);
89 }
90 if ((statb.st_mode & S_IFMT) != S_IFCHR &&
91 (statb.st_mode & S_IFMT) != S_IFBLK) {
92 if (bkgrdflag != 0 && (statb.st_flags & SF_SNAPSHOT) == 0) {
93 unlink(snapname);
94 printf("background fsck lacks a snapshot\n");
95 exit(EEXIT);
96 }
97 if ((statb.st_flags & SF_SNAPSHOT) != 0 && cvtlevel == 0) {
98 cursnapshot = statb.st_ino;
99 } else {
100 if (cvtlevel == 0 ||
101 (statb.st_flags & SF_SNAPSHOT) == 0) {
102 if (preen && bkgrdflag) {
103 unlink(snapname);
104 bkgrdflag = 0;
105 }
106 pfatal("%s is not a disk device", dev);
107 if (reply("CONTINUE") == 0) {
108 if (bkgrdflag) {
109 unlink(snapname);
110 bkgrdflag = 0;
111 }
112 return (0);
113 }
114 } else {
115 if (bkgrdflag) {
116 unlink(snapname);
117 bkgrdflag = 0;
118 }
119 pfatal("cannot convert a snapshot");
120 exit(EEXIT);
121 }
122 }
123 }
124 if ((fsreadfd = open(dev, O_RDONLY)) < 0) {
125 if (bkgrdflag) {
126 unlink(snapname);
127 bkgrdflag = 0;
128 }
129 printf("Can't open %s: %s\n", dev, strerror(errno));
130 return (0);
131 }
132 if (bkgrdflag) {
133 unlink(snapname);
134 size = MIBSIZE;
135 if (sysctlnametomib("vfs.ffs.adjrefcnt", adjrefcnt, &size) < 0||
136 sysctlnametomib("vfs.ffs.adjblkcnt", adjblkcnt, &size) < 0||
137 sysctlnametomib("vfs.ffs.freefiles", freefiles, &size) < 0||
138 sysctlnametomib("vfs.ffs.freedirs", freedirs, &size) < 0 ||
139 sysctlnametomib("vfs.ffs.freeblks", freeblks, &size) < 0) {
140 pfatal("kernel lacks background fsck support\n");
141 exit(EEXIT);
142 }
143 /*
144 * When kernel is lack of runtime bgfsck superblock summary
145 * adjustment functionality, it does not mean we can not
146 * continue, as old kernels will recompute the summary at
147 * mount time. However, it will be an unexpected softupdates
148 * inconsistency if it turns out that the summary is still
149 * incorrect. Set a flag so subsequent operation can know
150 * this.
151 */
152 bkgrdsumadj = 1;
153 if (sysctlnametomib("vfs.ffs.adjndir", adjndir, &size) < 0 ||
154 sysctlnametomib("vfs.ffs.adjnbfree", adjnbfree, &size) < 0 ||
155 sysctlnametomib("vfs.ffs.adjnifree", adjnifree, &size) < 0 ||
156 sysctlnametomib("vfs.ffs.adjnffree", adjnffree, &size) < 0 ||
157 sysctlnametomib("vfs.ffs.adjnumclusters", adjnumclusters, &size) < 0) {
158 bkgrdsumadj = 0;
159 pwarn("kernel lacks runtime superblock summary adjustment support");
160 }
161 cmd.version = FFS_CMD_VERSION;
162 cmd.handle = fsreadfd;
163 fswritefd = -1;
164 }
165 if (preen == 0)
166 printf("** %s", dev);
167 if (bkgrdflag == 0 &&
168 (nflag || (fswritefd = open(dev, O_WRONLY)) < 0)) {
169 fswritefd = -1;
170 if (preen)
171 pfatal("NO WRITE ACCESS");
172 printf(" (NO WRITE)");
173 }
174 if (preen == 0)
175 printf("\n");
176 /*
177 * Read in the superblock, looking for alternates if necessary
178 */
179 if (readsb(1) == 0) {
180 skipclean = 0;
181 if (bflag || preen || calcsb(dev, fsreadfd, &proto) == 0)
182 return(0);
183 if (reply("LOOK FOR ALTERNATE SUPERBLOCKS") == 0)
184 return (0);
185 for (cg = 0; cg < proto.fs_ncg; cg++) {
186 bflag = fsbtodb(&proto, cgsblock(&proto, cg));
187 if (readsb(0) != 0)
188 break;
189 }
190 if (cg >= proto.fs_ncg) {
191 printf("%s %s\n%s %s\n%s %s\n",
192 "SEARCH FOR ALTERNATE SUPER-BLOCK",
193 "FAILED. YOU MUST USE THE",
194 "-b OPTION TO FSCK TO SPECIFY THE",
195 "LOCATION OF AN ALTERNATE",
196 "SUPER-BLOCK TO SUPPLY NEEDED",
197 "INFORMATION; SEE fsck_ffs(8).");
198 bflag = 0;
199 return(0);
200 }
201 pwarn("USING ALTERNATE SUPERBLOCK AT %d\n", bflag);
202 bflag = 0;
203 }
204 if (skipclean && ckclean && sblock.fs_clean) {
205 pwarn("FILE SYSTEM CLEAN; SKIPPING CHECKS\n");
206 return (-1);
207 }
208 maxfsblock = sblock.fs_size;
209 maxino = sblock.fs_ncg * sblock.fs_ipg;
210 /*
211 * Check and potentially fix certain fields in the super block.
212 */
213 if (sblock.fs_optim != FS_OPTTIME && sblock.fs_optim != FS_OPTSPACE) {
214 pfatal("UNDEFINED OPTIMIZATION IN SUPERBLOCK");
215 if (reply("SET TO DEFAULT") == 1) {
216 sblock.fs_optim = FS_OPTTIME;
217 sbdirty();
218 }
219 }
220 if ((sblock.fs_minfree < 0 || sblock.fs_minfree > 99)) {
221 pfatal("IMPOSSIBLE MINFREE=%d IN SUPERBLOCK",
222 sblock.fs_minfree);
223 if (reply("SET TO DEFAULT") == 1) {
224 sblock.fs_minfree = 10;
225 sbdirty();
226 }
227 }
228 if (sblock.fs_magic == FS_UFS1_MAGIC &&
229 sblock.fs_old_inodefmt < FS_44INODEFMT) {
230 pwarn("Format of file system is too old.\n");
231 pwarn("Must update to modern format using a version of fsck\n");
232 pfatal("from before 2002 with the command ``fsck -c 2''\n");
233 exit(EEXIT);
234 }
235 if (asblk.b_dirty && !bflag) {
236 memmove(&altsblock, &sblock, (size_t)sblock.fs_sbsize);
237 flush(fswritefd, &asblk);
238 }
239 /*
240 * read in the summary info.
241 */
242 asked = 0;
243 sblock.fs_csp = Calloc(1, sblock.fs_cssize);
244 if (sblock.fs_csp == NULL) {
245 printf("cannot alloc %u bytes for cg summary info\n",
246 (unsigned)sblock.fs_cssize);
247 goto badsb;
248 }
249 for (i = 0, j = 0; i < sblock.fs_cssize; i += sblock.fs_bsize, j++) {
250 size = sblock.fs_cssize - i < sblock.fs_bsize ?
251 sblock.fs_cssize - i : sblock.fs_bsize;
252 readcnt[sblk.b_type]++;
253 if (blread(fsreadfd, (char *)sblock.fs_csp + i,
254 fsbtodb(&sblock, sblock.fs_csaddr + j * sblock.fs_frag),
255 size) != 0 && !asked) {
256 pfatal("BAD SUMMARY INFORMATION");
257 if (reply("CONTINUE") == 0) {
258 ckfini(0);
259 exit(EEXIT);
260 }
261 asked++;
262 }
263 }
264 /*
265 * allocate and initialize the necessary maps
266 */
267 bmapsize = roundup(howmany(maxfsblock, CHAR_BIT), sizeof(short));
268 blockmap = Calloc((unsigned)bmapsize, sizeof (char));
269 if (blockmap == NULL) {
270 printf("cannot alloc %u bytes for blockmap\n",
271 (unsigned)bmapsize);
272 goto badsb;
273 }
274 inostathead = Calloc((unsigned)(sblock.fs_ncg),
275 sizeof(struct inostatlist));
276 if (inostathead == NULL) {
277 printf("cannot alloc %u bytes for inostathead\n",
278 (unsigned)(sizeof(struct inostatlist) * (sblock.fs_ncg)));
279 goto badsb;
280 }
281 numdirs = MAX(sblock.fs_cstotal.cs_ndir, 128);
282 dirhash = numdirs;
283 inplast = 0;
284 listmax = numdirs + 10;
285 inpsort = (struct inoinfo **)Calloc((unsigned)listmax,
286 sizeof(struct inoinfo *));
287 inphead = (struct inoinfo **)Calloc((unsigned)numdirs,
288 sizeof(struct inoinfo *));
289 if (inpsort == NULL || inphead == NULL) {
290 printf("cannot alloc %ju bytes for inphead\n",
291 (uintmax_t)numdirs * sizeof(struct inoinfo *));
292 goto badsb;
293 }
294 bufinit();
295 if (sblock.fs_flags & FS_DOSOFTDEP)
296 usedsoftdep = 1;
297 else
298 usedsoftdep = 0;
299 return (1);
300
301 badsb:
302 ckfini(0);
303 return (0);
304 }
305
306 /*
307 * Possible superblock locations ordered from most to least likely.
308 */
309 static int sblock_try[] = SBLOCKSEARCH;
310
311 #define BAD_MAGIC_MSG \
312 "The previous newfs operation on this volume did not complete.\n" \
313 "You must complete newfs before mounting this volume.\n"
314
315 /*
316 * Read in the super block and its summary info.
317 */
318 int
readsb(int listerr)319 readsb(int listerr)
320 {
321 ufs2_daddr_t super;
322 int i;
323
324 if (bflag) {
325 super = bflag;
326 readcnt[sblk.b_type]++;
327 if ((blread(fsreadfd, (char *)&sblock, super, (long)SBLOCKSIZE)))
328 return (0);
329 if (sblock.fs_magic == FS_BAD_MAGIC) {
330 fprintf(stderr, BAD_MAGIC_MSG);
331 exit(11);
332 }
333 if (sblock.fs_magic != FS_UFS1_MAGIC &&
334 sblock.fs_magic != FS_UFS2_MAGIC) {
335 fprintf(stderr, "%d is not a file system superblock\n",
336 bflag);
337 return (0);
338 }
339 } else {
340 for (i = 0; sblock_try[i] != -1; i++) {
341 super = sblock_try[i] / dev_bsize;
342 readcnt[sblk.b_type]++;
343 if ((blread(fsreadfd, (char *)&sblock, super,
344 (long)SBLOCKSIZE)))
345 return (0);
346 if (sblock.fs_magic == FS_BAD_MAGIC) {
347 fprintf(stderr, BAD_MAGIC_MSG);
348 exit(11);
349 }
350 if ((sblock.fs_magic == FS_UFS1_MAGIC ||
351 (sblock.fs_magic == FS_UFS2_MAGIC &&
352 sblock.fs_sblockloc == sblock_try[i])) &&
353 sblock.fs_ncg >= 1 &&
354 sblock.fs_bsize >= MINBSIZE &&
355 sblock.fs_sbsize >= roundup(sizeof(struct fs), dev_bsize))
356 break;
357 }
358 if (sblock_try[i] == -1) {
359 fprintf(stderr, "Cannot find file system superblock\n");
360 return (0);
361 }
362 }
363 /*
364 * Compute block size that the file system is based on,
365 * according to fsbtodb, and adjust superblock block number
366 * so we can tell if this is an alternate later.
367 */
368 super *= dev_bsize;
369 dev_bsize = sblock.fs_fsize / fsbtodb(&sblock, 1);
370 sblk.b_bno = super / dev_bsize;
371 sblk.b_size = SBLOCKSIZE;
372 if (bflag)
373 goto out;
374 /*
375 * Compare all fields that should not differ in alternate super block.
376 * When an alternate super-block is specified this check is skipped.
377 */
378 getblk(&asblk, cgsblock(&sblock, sblock.fs_ncg - 1), sblock.fs_sbsize);
379 if (asblk.b_errs)
380 return (0);
381 if (altsblock.fs_sblkno != sblock.fs_sblkno ||
382 altsblock.fs_cblkno != sblock.fs_cblkno ||
383 altsblock.fs_iblkno != sblock.fs_iblkno ||
384 altsblock.fs_dblkno != sblock.fs_dblkno ||
385 altsblock.fs_ncg != sblock.fs_ncg ||
386 altsblock.fs_bsize != sblock.fs_bsize ||
387 altsblock.fs_fsize != sblock.fs_fsize ||
388 altsblock.fs_frag != sblock.fs_frag ||
389 altsblock.fs_bmask != sblock.fs_bmask ||
390 altsblock.fs_fmask != sblock.fs_fmask ||
391 altsblock.fs_bshift != sblock.fs_bshift ||
392 altsblock.fs_fshift != sblock.fs_fshift ||
393 altsblock.fs_fragshift != sblock.fs_fragshift ||
394 altsblock.fs_fsbtodb != sblock.fs_fsbtodb ||
395 altsblock.fs_sbsize != sblock.fs_sbsize ||
396 altsblock.fs_nindir != sblock.fs_nindir ||
397 altsblock.fs_inopb != sblock.fs_inopb ||
398 altsblock.fs_cssize != sblock.fs_cssize ||
399 altsblock.fs_ipg != sblock.fs_ipg ||
400 altsblock.fs_fpg != sblock.fs_fpg ||
401 altsblock.fs_magic != sblock.fs_magic) {
402 badsb(listerr,
403 "VALUES IN SUPER BLOCK DISAGREE WITH THOSE IN FIRST ALTERNATE");
404 return (0);
405 }
406 out:
407 /*
408 * If not yet done, update UFS1 superblock with new wider fields.
409 */
410 if (sblock.fs_magic == FS_UFS1_MAGIC &&
411 sblock.fs_maxbsize != sblock.fs_bsize) {
412 sblock.fs_maxbsize = sblock.fs_bsize;
413 sblock.fs_time = sblock.fs_old_time;
414 sblock.fs_size = sblock.fs_old_size;
415 sblock.fs_dsize = sblock.fs_old_dsize;
416 sblock.fs_csaddr = sblock.fs_old_csaddr;
417 sblock.fs_cstotal.cs_ndir = sblock.fs_old_cstotal.cs_ndir;
418 sblock.fs_cstotal.cs_nbfree = sblock.fs_old_cstotal.cs_nbfree;
419 sblock.fs_cstotal.cs_nifree = sblock.fs_old_cstotal.cs_nifree;
420 sblock.fs_cstotal.cs_nffree = sblock.fs_old_cstotal.cs_nffree;
421 }
422 havesb = 1;
423 return (1);
424 }
425
426 static void
badsb(int listerr,const char * s)427 badsb(int listerr, const char *s)
428 {
429
430 if (!listerr)
431 return;
432 if (preen)
433 printf("%s: ", cdevname);
434 pfatal("BAD SUPER BLOCK: %s\n", s);
435 }
436
437 void
sblock_init(void)438 sblock_init(void)
439 {
440 struct disklabel *lp;
441
442 fswritefd = -1;
443 fsmodified = 0;
444 lfdir = 0;
445 initbarea(&sblk, BT_SUPERBLK);
446 initbarea(&asblk, BT_SUPERBLK);
447 sblk.b_un.b_buf = Malloc(SBLOCKSIZE);
448 asblk.b_un.b_buf = Malloc(SBLOCKSIZE);
449 if (sblk.b_un.b_buf == NULL || asblk.b_un.b_buf == NULL)
450 errx(EEXIT, "cannot allocate space for superblock");
451 if ((lp = getdisklabel(NULL, fsreadfd)))
452 real_dev_bsize = dev_bsize = secsize = lp->d_secsize;
453 else
454 dev_bsize = secsize = DEV_BSIZE;
455 }
456
457 /*
458 * Calculate a prototype superblock based on information in the disk label.
459 * When done the cgsblock macro can be calculated and the fs_ncg field
460 * can be used. Do NOT attempt to use other macros without verifying that
461 * their needed information is available!
462 */
463 static int
calcsb(char * dev,int devfd,struct fs * fs)464 calcsb(char *dev, int devfd, struct fs *fs)
465 {
466 struct disklabel *lp;
467 struct partition *pp;
468 char *cp;
469 int i, nspf;
470
471 cp = strchr(dev, '\0') - 1;
472 if (cp == (char *)-1 || ((*cp < 'a' || *cp > 'h') && !isdigit(*cp))) {
473 pfatal("%s: CANNOT FIGURE OUT FILE SYSTEM PARTITION\n", dev);
474 return (0);
475 }
476 lp = getdisklabel(dev, devfd);
477 if (isdigit(*cp))
478 pp = &lp->d_partitions[0];
479 else
480 pp = &lp->d_partitions[*cp - 'a'];
481 if (pp->p_fstype != FS_BSDFFS) {
482 pfatal("%s: NOT LABELED AS A BSD FILE SYSTEM (%s)\n",
483 dev, pp->p_fstype < FSMAXTYPES ?
484 fstypenames[pp->p_fstype] : "unknown");
485 return (0);
486 }
487 if (pp->p_fsize == 0 || pp->p_frag == 0 ||
488 pp->p_cpg == 0 || pp->p_size == 0) {
489 pfatal("%s: %s: type %s fsize %d, frag %d, cpg %d, size %d\n",
490 dev, "INCOMPLETE LABEL", fstypenames[pp->p_fstype],
491 pp->p_fsize, pp->p_frag, pp->p_cpg, pp->p_size);
492 return (0);
493 }
494 memset(fs, 0, sizeof(struct fs));
495 fs->fs_fsize = pp->p_fsize;
496 fs->fs_frag = pp->p_frag;
497 fs->fs_size = pp->p_size;
498 fs->fs_sblkno = roundup(
499 howmany(lp->d_bbsize + lp->d_sbsize, fs->fs_fsize),
500 fs->fs_frag);
501 nspf = fs->fs_fsize / lp->d_secsize;
502 for (fs->fs_fsbtodb = 0, i = nspf; i > 1; i >>= 1)
503 fs->fs_fsbtodb++;
504 dev_bsize = lp->d_secsize;
505 if (fs->fs_magic == FS_UFS2_MAGIC) {
506 fs->fs_fpg = pp->p_cpg;
507 fs->fs_ncg = howmany(fs->fs_size, fs->fs_fpg);
508 } else /* if (fs->fs_magic == FS_UFS1_MAGIC) */ {
509 fs->fs_old_cpg = pp->p_cpg;
510 fs->fs_old_cgmask = 0xffffffff;
511 for (i = lp->d_ntracks; i > 1; i >>= 1)
512 fs->fs_old_cgmask <<= 1;
513 if (!POWEROF2(lp->d_ntracks))
514 fs->fs_old_cgmask <<= 1;
515 fs->fs_old_cgoffset = roundup(howmany(lp->d_nsectors, nspf),
516 fs->fs_frag);
517 fs->fs_fpg = (fs->fs_old_cpg * lp->d_secpercyl) / nspf;
518 fs->fs_ncg = howmany(fs->fs_size / lp->d_secpercyl,
519 fs->fs_old_cpg);
520 }
521 return (1);
522 }
523
524 static struct disklabel *
getdisklabel(char * s,int fd)525 getdisklabel(char *s, int fd)
526 {
527 static struct disklabel lab;
528
529 if (ioctl(fd, DIOCGDINFO, (char *)&lab) < 0) {
530 if (s == NULL)
531 return ((struct disklabel *)NULL);
532 pwarn("ioctl (GCINFO): %s\n", strerror(errno));
533 errx(EEXIT, "%s: can't read disk label", s);
534 }
535 return (&lab);
536 }
537