1 /*
2 * Copyright (c) 1980, 1986, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * %sccs.include.redist.c%
6 */
7
8 #ifndef lint
9 static char sccsid[] = "@(#)setup.c 8.10 (Berkeley) 05/09/95";
10 #endif /* not lint */
11
12 #define DKTYPENAMES
13 #include <sys/param.h>
14 #include <sys/time.h>
15 #include <sys/stat.h>
16 #include <sys/ioctl.h>
17 #include <sys/disklabel.h>
18 #include <sys/file.h>
19
20 #include <ufs/ufs/dinode.h>
21 #include <ufs/ffs/fs.h>
22
23 #include <ctype.h>
24 #include <err.h>
25 #include <errno.h>
26 #include <string.h>
27
28 #include "fsck.h"
29
30 struct bufarea asblk;
31 #define altsblock (*asblk.b_un.b_fs)
32 #define POWEROF2(num) (((num) & ((num) - 1)) == 0)
33
34 static void badsb __P((int listerr, char *s));
35 static int calcsb __P((char *dev, int devfd, struct fs *fs));
36 static struct disklabel *getdisklabel __P((char *s, int fd));
37 static int readsb __P((int listerr));
38
39 /*
40 * Read in a superblock finding an alternate if necessary.
41 * Return 1 if successful, 0 if unsuccessful, -1 if filesystem
42 * is already clean (preen mode only).
43 */
44 int
setup(dev)45 setup(dev)
46 char *dev;
47 {
48 long cg, size, asked, i, j;
49 long skipclean, bmapsize;
50 struct disklabel *lp;
51 off_t sizepb;
52 struct stat statb;
53 struct fs proto;
54
55 havesb = 0;
56 fswritefd = -1;
57 skipclean = preen;
58 if (stat(dev, &statb) < 0) {
59 printf("Can't stat %s: %s\n", dev, strerror(errno));
60 return (0);
61 }
62 if ((statb.st_mode & S_IFMT) != S_IFCHR) {
63 pfatal("%s is not a character device", dev);
64 if (reply("CONTINUE") == 0)
65 return (0);
66 }
67 if ((fsreadfd = open(dev, O_RDONLY)) < 0) {
68 printf("Can't open %s: %s\n", dev, strerror(errno));
69 return (0);
70 }
71 if (preen == 0)
72 printf("** %s", dev);
73 if (nflag || (fswritefd = open(dev, O_WRONLY)) < 0) {
74 fswritefd = -1;
75 if (preen)
76 pfatal("NO WRITE ACCESS");
77 printf(" (NO WRITE)");
78 }
79 if (preen == 0)
80 printf("\n");
81 fsmodified = 0;
82 lfdir = 0;
83 initbarea(&sblk);
84 initbarea(&asblk);
85 sblk.b_un.b_buf = malloc(SBSIZE);
86 asblk.b_un.b_buf = malloc(SBSIZE);
87 if (sblk.b_un.b_buf == NULL || asblk.b_un.b_buf == NULL)
88 errx(EEXIT, "cannot allocate space for superblock");
89 if (lp = getdisklabel(NULL, fsreadfd))
90 dev_bsize = secsize = lp->d_secsize;
91 else
92 dev_bsize = secsize = DEV_BSIZE;
93 /*
94 * Read in the superblock, looking for alternates if necessary
95 */
96 if (readsb(1) == 0) {
97 skipclean = 0;
98 if (bflag || preen || calcsb(dev, fsreadfd, &proto) == 0)
99 return(0);
100 if (reply("LOOK FOR ALTERNATE SUPERBLOCKS") == 0)
101 return (0);
102 for (cg = 0; cg < proto.fs_ncg; cg++) {
103 bflag = fsbtodb(&proto, cgsblock(&proto, cg));
104 if (readsb(0) != 0)
105 break;
106 }
107 if (cg >= proto.fs_ncg) {
108 printf("%s %s\n%s %s\n%s %s\n",
109 "SEARCH FOR ALTERNATE SUPER-BLOCK",
110 "FAILED. YOU MUST USE THE",
111 "-b OPTION TO FSCK TO SPECIFY THE",
112 "LOCATION OF AN ALTERNATE",
113 "SUPER-BLOCK TO SUPPLY NEEDED",
114 "INFORMATION; SEE fsck(8).");
115 return(0);
116 }
117 pwarn("USING ALTERNATE SUPERBLOCK AT %d\n", bflag);
118 }
119 if (skipclean && sblock.fs_clean) {
120 pwarn("FILESYSTEM CLEAN; SKIPPING CHECKS\n");
121 return (-1);
122 }
123 maxfsblock = sblock.fs_size;
124 maxino = sblock.fs_ncg * sblock.fs_ipg;
125 /*
126 * Check and potentially fix certain fields in the super block.
127 */
128 if (sblock.fs_optim != FS_OPTTIME && sblock.fs_optim != FS_OPTSPACE) {
129 pfatal("UNDEFINED OPTIMIZATION IN SUPERBLOCK");
130 if (reply("SET TO DEFAULT") == 1) {
131 sblock.fs_optim = FS_OPTTIME;
132 sbdirty();
133 }
134 }
135 if ((sblock.fs_minfree < 0 || sblock.fs_minfree > 99)) {
136 pfatal("IMPOSSIBLE MINFREE=%d IN SUPERBLOCK",
137 sblock.fs_minfree);
138 if (reply("SET TO DEFAULT") == 1) {
139 sblock.fs_minfree = 10;
140 sbdirty();
141 }
142 }
143 if (sblock.fs_interleave < 1 ||
144 sblock.fs_interleave > sblock.fs_nsect) {
145 pwarn("IMPOSSIBLE INTERLEAVE=%d IN SUPERBLOCK",
146 sblock.fs_interleave);
147 sblock.fs_interleave = 1;
148 if (preen)
149 printf(" (FIXED)\n");
150 if (preen || reply("SET TO DEFAULT") == 1) {
151 sbdirty();
152 dirty(&asblk);
153 }
154 }
155 if (sblock.fs_npsect < sblock.fs_nsect ||
156 sblock.fs_npsect > sblock.fs_nsect*2) {
157 pwarn("IMPOSSIBLE NPSECT=%d IN SUPERBLOCK",
158 sblock.fs_npsect);
159 sblock.fs_npsect = sblock.fs_nsect;
160 if (preen)
161 printf(" (FIXED)\n");
162 if (preen || reply("SET TO DEFAULT") == 1) {
163 sbdirty();
164 dirty(&asblk);
165 }
166 }
167 if (sblock.fs_inodefmt >= FS_44INODEFMT) {
168 newinofmt = 1;
169 } else {
170 sblock.fs_qbmask = ~sblock.fs_bmask;
171 sblock.fs_qfmask = ~sblock.fs_fmask;
172 newinofmt = 0;
173 }
174 /*
175 * Convert to new inode format.
176 */
177 if (cvtlevel >= 2 && sblock.fs_inodefmt < FS_44INODEFMT) {
178 if (preen)
179 pwarn("CONVERTING TO NEW INODE FORMAT\n");
180 else if (!reply("CONVERT TO NEW INODE FORMAT"))
181 return(0);
182 doinglevel2++;
183 sblock.fs_inodefmt = FS_44INODEFMT;
184 sizepb = sblock.fs_bsize;
185 sblock.fs_maxfilesize = sblock.fs_bsize * NDADDR - 1;
186 for (i = 0; i < NIADDR; i++) {
187 sizepb *= NINDIR(&sblock);
188 sblock.fs_maxfilesize += sizepb;
189 }
190 sblock.fs_maxsymlinklen = MAXSYMLINKLEN;
191 sblock.fs_qbmask = ~sblock.fs_bmask;
192 sblock.fs_qfmask = ~sblock.fs_fmask;
193 sbdirty();
194 dirty(&asblk);
195 }
196 /*
197 * Convert to new cylinder group format.
198 */
199 if (cvtlevel >= 1 && sblock.fs_postblformat == FS_42POSTBLFMT) {
200 if (preen)
201 pwarn("CONVERTING TO NEW CYLINDER GROUP FORMAT\n");
202 else if (!reply("CONVERT TO NEW CYLINDER GROUP FORMAT"))
203 return(0);
204 doinglevel1++;
205 sblock.fs_postblformat = FS_DYNAMICPOSTBLFMT;
206 sblock.fs_nrpos = 8;
207 sblock.fs_postbloff =
208 (char *)(&sblock.fs_opostbl[0][0]) -
209 (char *)(&sblock.fs_firstfield);
210 sblock.fs_rotbloff = &sblock.fs_space[0] -
211 (u_char *)(&sblock.fs_firstfield);
212 sblock.fs_cgsize =
213 fragroundup(&sblock, CGSIZE(&sblock));
214 sbdirty();
215 dirty(&asblk);
216 }
217 if (asblk.b_dirty && !bflag) {
218 memmove(&altsblock, &sblock, (size_t)sblock.fs_sbsize);
219 flush(fswritefd, &asblk);
220 }
221 /*
222 * read in the summary info.
223 */
224 asked = 0;
225 for (i = 0, j = 0; i < sblock.fs_cssize; i += sblock.fs_bsize, j++) {
226 size = sblock.fs_cssize - i < sblock.fs_bsize ?
227 sblock.fs_cssize - i : sblock.fs_bsize;
228 sblock.fs_csp[j] = (struct csum *)calloc(1, (unsigned)size);
229 if (bread(fsreadfd, (char *)sblock.fs_csp[j],
230 fsbtodb(&sblock, sblock.fs_csaddr + j * sblock.fs_frag),
231 size) != 0 && !asked) {
232 pfatal("BAD SUMMARY INFORMATION");
233 if (reply("CONTINUE") == 0)
234 exit(EEXIT);
235 asked++;
236 }
237 }
238 /*
239 * allocate and initialize the necessary maps
240 */
241 bmapsize = roundup(howmany(maxfsblock, NBBY), sizeof(short));
242 blockmap = calloc((unsigned)bmapsize, sizeof (char));
243 if (blockmap == NULL) {
244 printf("cannot alloc %u bytes for blockmap\n",
245 (unsigned)bmapsize);
246 goto badsb;
247 }
248 statemap = calloc((unsigned)(maxino + 1), sizeof(char));
249 if (statemap == NULL) {
250 printf("cannot alloc %u bytes for statemap\n",
251 (unsigned)(maxino + 1));
252 goto badsb;
253 }
254 typemap = calloc((unsigned)(maxino + 1), sizeof(char));
255 if (typemap == NULL) {
256 printf("cannot alloc %u bytes for typemap\n",
257 (unsigned)(maxino + 1));
258 goto badsb;
259 }
260 lncntp = (short *)calloc((unsigned)(maxino + 1), sizeof(short));
261 if (lncntp == NULL) {
262 printf("cannot alloc %u bytes for lncntp\n",
263 (unsigned)(maxino + 1) * sizeof(short));
264 goto badsb;
265 }
266 numdirs = sblock.fs_cstotal.cs_ndir;
267 inplast = 0;
268 listmax = numdirs + 10;
269 inpsort = (struct inoinfo **)calloc((unsigned)listmax,
270 sizeof(struct inoinfo *));
271 inphead = (struct inoinfo **)calloc((unsigned)numdirs,
272 sizeof(struct inoinfo *));
273 if (inpsort == NULL || inphead == NULL) {
274 printf("cannot alloc %u bytes for inphead\n",
275 (unsigned)numdirs * sizeof(struct inoinfo *));
276 goto badsb;
277 }
278 bufinit();
279 return (1);
280
281 badsb:
282 ckfini(0);
283 return (0);
284 }
285
286 /*
287 * Read in the super block and its summary info.
288 */
289 static int
readsb(listerr)290 readsb(listerr)
291 int listerr;
292 {
293 ufs_daddr_t super = bflag ? bflag : SBOFF / dev_bsize;
294
295 if (bread(fsreadfd, (char *)&sblock, super, (long)SBSIZE) != 0)
296 return (0);
297 sblk.b_bno = super;
298 sblk.b_size = SBSIZE;
299 /*
300 * run a few consistency checks of the super block
301 */
302 if (sblock.fs_magic != FS_MAGIC)
303 { badsb(listerr, "MAGIC NUMBER WRONG"); return (0); }
304 if (sblock.fs_ncg < 1)
305 { badsb(listerr, "NCG OUT OF RANGE"); return (0); }
306 if (sblock.fs_cpg < 1)
307 { badsb(listerr, "CPG OUT OF RANGE"); return (0); }
308 if (sblock.fs_ncg * sblock.fs_cpg < sblock.fs_ncyl ||
309 (sblock.fs_ncg - 1) * sblock.fs_cpg >= sblock.fs_ncyl)
310 { badsb(listerr, "NCYL LESS THAN NCG*CPG"); return (0); }
311 if (sblock.fs_sbsize > SBSIZE)
312 { badsb(listerr, "SIZE PREPOSTEROUSLY LARGE"); return (0); }
313 /*
314 * Compute block size that the filesystem is based on,
315 * according to fsbtodb, and adjust superblock block number
316 * so we can tell if this is an alternate later.
317 */
318 super *= dev_bsize;
319 dev_bsize = sblock.fs_fsize / fsbtodb(&sblock, 1);
320 sblk.b_bno = super / dev_bsize;
321 if (bflag) {
322 havesb = 1;
323 return (1);
324 }
325 /*
326 * Set all possible fields that could differ, then do check
327 * of whole super block against an alternate super block.
328 * When an alternate super-block is specified this check is skipped.
329 */
330 getblk(&asblk, cgsblock(&sblock, sblock.fs_ncg - 1), sblock.fs_sbsize);
331 if (asblk.b_errs)
332 return (0);
333 altsblock.fs_firstfield = sblock.fs_firstfield;
334 altsblock.fs_unused_1 = sblock.fs_unused_1;
335 altsblock.fs_time = sblock.fs_time;
336 altsblock.fs_cstotal = sblock.fs_cstotal;
337 altsblock.fs_cgrotor = sblock.fs_cgrotor;
338 altsblock.fs_fmod = sblock.fs_fmod;
339 altsblock.fs_clean = sblock.fs_clean;
340 altsblock.fs_ronly = sblock.fs_ronly;
341 altsblock.fs_flags = sblock.fs_flags;
342 altsblock.fs_maxcontig = sblock.fs_maxcontig;
343 altsblock.fs_minfree = sblock.fs_minfree;
344 altsblock.fs_optim = sblock.fs_optim;
345 altsblock.fs_rotdelay = sblock.fs_rotdelay;
346 altsblock.fs_maxbpg = sblock.fs_maxbpg;
347 memmove(altsblock.fs_csp, sblock.fs_csp, sizeof sblock.fs_csp);
348 altsblock.fs_maxcluster = sblock.fs_maxcluster;
349 memmove(altsblock.fs_fsmnt, sblock.fs_fsmnt, sizeof sblock.fs_fsmnt);
350 memmove(altsblock.fs_sparecon,
351 sblock.fs_sparecon, sizeof sblock.fs_sparecon);
352 /*
353 * The following should not have to be copied.
354 */
355 altsblock.fs_fsbtodb = sblock.fs_fsbtodb;
356 altsblock.fs_interleave = sblock.fs_interleave;
357 altsblock.fs_npsect = sblock.fs_npsect;
358 altsblock.fs_nrpos = sblock.fs_nrpos;
359 altsblock.fs_state = sblock.fs_state;
360 altsblock.fs_qbmask = sblock.fs_qbmask;
361 altsblock.fs_qfmask = sblock.fs_qfmask;
362 altsblock.fs_state = sblock.fs_state;
363 altsblock.fs_maxfilesize = sblock.fs_maxfilesize;
364 if (memcmp(&sblock, &altsblock, (int)sblock.fs_sbsize)) {
365 if (debug) {
366 long *nlp, *olp, *endlp;
367
368 printf("superblock mismatches\n");
369 nlp = (long *)&altsblock;
370 olp = (long *)&sblock;
371 endlp = olp + (sblock.fs_sbsize / sizeof *olp);
372 for ( ; olp < endlp; olp++, nlp++) {
373 if (*olp == *nlp)
374 continue;
375 printf("offset %d, original %d, alternate %d\n",
376 olp - (long *)&sblock, *olp, *nlp);
377 }
378 }
379 badsb(listerr,
380 "VALUES IN SUPER BLOCK DISAGREE WITH THOSE IN FIRST ALTERNATE");
381 return (0);
382 }
383 havesb = 1;
384 return (1);
385 }
386
387 static void
badsb(listerr,s)388 badsb(listerr, s)
389 int listerr;
390 char *s;
391 {
392
393 if (!listerr)
394 return;
395 if (preen)
396 printf("%s: ", cdevname);
397 pfatal("BAD SUPER BLOCK: %s\n", s);
398 }
399
400 /*
401 * Calculate a prototype superblock based on information in the disk label.
402 * When done the cgsblock macro can be calculated and the fs_ncg field
403 * can be used. Do NOT attempt to use other macros without verifying that
404 * their needed information is available!
405 */
406 static int
calcsb(dev,devfd,fs)407 calcsb(dev, devfd, fs)
408 char *dev;
409 int devfd;
410 register struct fs *fs;
411 {
412 register struct disklabel *lp;
413 register struct partition *pp;
414 register char *cp;
415 int i;
416
417 cp = strchr(dev, '\0') - 1;
418 if (cp == (char *)-1 || ((*cp < 'a' || *cp > 'h') && !isdigit(*cp))) {
419 pfatal("%s: CANNOT FIGURE OUT FILE SYSTEM PARTITION\n", dev);
420 return (0);
421 }
422 lp = getdisklabel(dev, devfd);
423 if (isdigit(*cp))
424 pp = &lp->d_partitions[0];
425 else
426 pp = &lp->d_partitions[*cp - 'a'];
427 if (pp->p_fstype != FS_BSDFFS) {
428 pfatal("%s: NOT LABELED AS A BSD FILE SYSTEM (%s)\n",
429 dev, pp->p_fstype < FSMAXTYPES ?
430 fstypenames[pp->p_fstype] : "unknown");
431 return (0);
432 }
433 memset(fs, 0, sizeof(struct fs));
434 fs->fs_fsize = pp->p_fsize;
435 fs->fs_frag = pp->p_frag;
436 fs->fs_cpg = pp->p_cpg;
437 fs->fs_size = pp->p_size;
438 fs->fs_ntrak = lp->d_ntracks;
439 fs->fs_nsect = lp->d_nsectors;
440 fs->fs_spc = lp->d_secpercyl;
441 fs->fs_nspf = fs->fs_fsize / lp->d_secsize;
442 fs->fs_sblkno = roundup(
443 howmany(lp->d_bbsize + lp->d_sbsize, fs->fs_fsize),
444 fs->fs_frag);
445 fs->fs_cgmask = 0xffffffff;
446 for (i = fs->fs_ntrak; i > 1; i >>= 1)
447 fs->fs_cgmask <<= 1;
448 if (!POWEROF2(fs->fs_ntrak))
449 fs->fs_cgmask <<= 1;
450 fs->fs_cgoffset = roundup(
451 howmany(fs->fs_nsect, NSPF(fs)), fs->fs_frag);
452 fs->fs_fpg = (fs->fs_cpg * fs->fs_spc) / NSPF(fs);
453 fs->fs_ncg = howmany(fs->fs_size / fs->fs_spc, fs->fs_cpg);
454 for (fs->fs_fsbtodb = 0, i = NSPF(fs); i > 1; i >>= 1)
455 fs->fs_fsbtodb++;
456 dev_bsize = lp->d_secsize;
457 return (1);
458 }
459
460 static struct disklabel *
getdisklabel(s,fd)461 getdisklabel(s, fd)
462 char *s;
463 int fd;
464 {
465 static struct disklabel lab;
466
467 if (ioctl(fd, DIOCGDINFO, (char *)&lab) < 0) {
468 if (s == NULL)
469 return ((struct disklabel *)NULL);
470 pwarn("ioctl (GCINFO): %s\n", strerror(errno));
471 errx(EEXIT, "%s: can't read disk label", s);
472 }
473 return (&lab);
474 }
475