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
63 /*
64 * Read in a superblock finding an alternate if necessary.
65 * Return 1 if successful, 0 if unsuccessful, -1 if file system
66 * is already clean (ckclean and preen mode only).
67 */
68 int
setup(char * dev)69 setup(char *dev)
70 {
71 long cg, asked, i, j;
72 long bmapsize;
73 struct stat statb;
74 struct fs proto;
75 size_t size;
76
77 havesb = 0;
78 fswritefd = -1;
79 cursnapshot = 0;
80 if (stat(dev, &statb) < 0) {
81 printf("Can't stat %s: %s\n", dev, strerror(errno));
82 if (bkgrdflag) {
83 unlink(snapname);
84 bkgrdflag = 0;
85 }
86 return (0);
87 }
88 if ((statb.st_mode & S_IFMT) != S_IFCHR &&
89 (statb.st_mode & S_IFMT) != S_IFBLK) {
90 if (bkgrdflag != 0 && (statb.st_flags & SF_SNAPSHOT) == 0) {
91 unlink(snapname);
92 printf("background fsck lacks a snapshot\n");
93 exit(EEXIT);
94 }
95 if ((statb.st_flags & SF_SNAPSHOT) != 0 && cvtlevel == 0) {
96 cursnapshot = statb.st_ino;
97 } else {
98 if (cvtlevel == 0 ||
99 (statb.st_flags & SF_SNAPSHOT) == 0) {
100 if (preen && bkgrdflag) {
101 unlink(snapname);
102 bkgrdflag = 0;
103 }
104 pfatal("%s is not a disk device", dev);
105 if (reply("CONTINUE") == 0) {
106 if (bkgrdflag) {
107 unlink(snapname);
108 bkgrdflag = 0;
109 }
110 return (0);
111 }
112 } else {
113 if (bkgrdflag) {
114 unlink(snapname);
115 bkgrdflag = 0;
116 }
117 pfatal("cannot convert a snapshot");
118 exit(EEXIT);
119 }
120 }
121 }
122 if ((fsreadfd = open(dev, O_RDONLY)) < 0) {
123 if (bkgrdflag) {
124 unlink(snapname);
125 bkgrdflag = 0;
126 }
127 printf("Can't open %s: %s\n", dev, strerror(errno));
128 return (0);
129 }
130 if (bkgrdflag) {
131 unlink(snapname);
132 size = MIBSIZE;
133 if (sysctlnametomib("vfs.ffs.adjrefcnt", adjrefcnt, &size) < 0||
134 sysctlnametomib("vfs.ffs.adjblkcnt", adjblkcnt, &size) < 0||
135 sysctlnametomib("vfs.ffs.freefiles", freefiles, &size) < 0||
136 sysctlnametomib("vfs.ffs.freedirs", freedirs, &size) < 0 ||
137 sysctlnametomib("vfs.ffs.freeblks", freeblks, &size) < 0) {
138 pfatal("kernel lacks background fsck support\n");
139 exit(EEXIT);
140 }
141 /*
142 * When kernel is lack of runtime bgfsck superblock summary
143 * adjustment functionality, it does not mean we can not
144 * continue, as old kernels will recompute the summary at
145 * mount time. However, it will be an unexpected softupdates
146 * inconsistency if it turns out that the summary is still
147 * incorrect. Set a flag so subsequent operation can know
148 * this.
149 */
150 bkgrdsumadj = 1;
151 if (sysctlnametomib("vfs.ffs.adjndir", adjndir, &size) < 0 ||
152 sysctlnametomib("vfs.ffs.adjnbfree", adjnbfree, &size) < 0 ||
153 sysctlnametomib("vfs.ffs.adjnifree", adjnifree, &size) < 0 ||
154 sysctlnametomib("vfs.ffs.adjnffree", adjnffree, &size) < 0 ||
155 sysctlnametomib("vfs.ffs.adjnumclusters", adjnumclusters, &size) < 0) {
156 bkgrdsumadj = 0;
157 pwarn("kernel lacks runtime superblock summary adjustment support");
158 }
159 cmd.version = FFS_CMD_VERSION;
160 cmd.handle = fsreadfd;
161 fswritefd = -1;
162 }
163 if (preen == 0)
164 printf("** %s", dev);
165 if (bkgrdflag == 0 &&
166 (nflag || (fswritefd = open(dev, O_WRONLY)) < 0)) {
167 fswritefd = -1;
168 if (preen)
169 pfatal("NO WRITE ACCESS");
170 printf(" (NO WRITE)");
171 }
172 if (preen == 0)
173 printf("\n");
174 /*
175 * Read in the superblock, looking for alternates if necessary
176 */
177 if (readsb(1) == 0) {
178 skipclean = 0;
179 if (bflag || preen)
180 return(0);
181 if (reply("LOOK FOR ALTERNATE SUPERBLOCKS") == 0)
182 return (0);
183 for (cg = 0; cg < proto.fs_ncg; cg++) {
184 bflag = fsbtodb(&proto, cgsblock(&proto, cg));
185 if (readsb(0) != 0)
186 break;
187 }
188 if (cg >= proto.fs_ncg) {
189 printf("%s %s\n%s %s\n%s %s\n",
190 "SEARCH FOR ALTERNATE SUPER-BLOCK",
191 "FAILED. YOU MUST USE THE",
192 "-b OPTION TO FSCK TO SPECIFY THE",
193 "LOCATION OF AN ALTERNATE",
194 "SUPER-BLOCK TO SUPPLY NEEDED",
195 "INFORMATION; SEE fsck_ffs(8).");
196 bflag = 0;
197 return(0);
198 }
199 pwarn("USING ALTERNATE SUPERBLOCK AT %d\n", bflag);
200 bflag = 0;
201 }
202 if (skipclean && ckclean && sblock.fs_clean) {
203 pwarn("FILE SYSTEM CLEAN; SKIPPING CHECKS\n");
204 return (-1);
205 }
206 maxfsblock = sblock.fs_size;
207 maxino = sblock.fs_ncg * sblock.fs_ipg;
208 /*
209 * Check and potentially fix certain fields in the super block.
210 */
211 if (sblock.fs_optim != FS_OPTTIME && sblock.fs_optim != FS_OPTSPACE) {
212 pfatal("UNDEFINED OPTIMIZATION IN SUPERBLOCK");
213 if (reply("SET TO DEFAULT") == 1) {
214 sblock.fs_optim = FS_OPTTIME;
215 sbdirty();
216 }
217 }
218 if ((sblock.fs_minfree < 0 || sblock.fs_minfree > 99)) {
219 pfatal("IMPOSSIBLE MINFREE=%d IN SUPERBLOCK",
220 sblock.fs_minfree);
221 if (reply("SET TO DEFAULT") == 1) {
222 sblock.fs_minfree = 10;
223 sbdirty();
224 }
225 }
226 if (sblock.fs_magic == FS_UFS1_MAGIC &&
227 sblock.fs_old_inodefmt < FS_44INODEFMT) {
228 pwarn("Format of file system is too old.\n");
229 pwarn("Must update to modern format using a version of fsck\n");
230 pfatal("from before 2002 with the command ``fsck -c 2''\n");
231 exit(EEXIT);
232 }
233 if (asblk.b_dirty && !bflag) {
234 memmove(&altsblock, &sblock, (size_t)sblock.fs_sbsize);
235 flush(fswritefd, &asblk);
236 }
237 /*
238 * read in the summary info.
239 */
240 asked = 0;
241 sblock.fs_csp = Calloc(1, sblock.fs_cssize);
242 if (sblock.fs_csp == NULL) {
243 printf("cannot alloc %u bytes for cg summary info\n",
244 (unsigned)sblock.fs_cssize);
245 goto badsb;
246 }
247 for (i = 0, j = 0; i < sblock.fs_cssize; i += sblock.fs_bsize, j++) {
248 size = sblock.fs_cssize - i < sblock.fs_bsize ?
249 sblock.fs_cssize - i : sblock.fs_bsize;
250 readcnt[sblk.b_type]++;
251 if (blread(fsreadfd, (char *)sblock.fs_csp + i,
252 fsbtodb(&sblock, sblock.fs_csaddr + j * sblock.fs_frag),
253 size) != 0 && !asked) {
254 pfatal("BAD SUMMARY INFORMATION");
255 if (reply("CONTINUE") == 0) {
256 ckfini(0);
257 exit(EEXIT);
258 }
259 asked++;
260 }
261 }
262 /*
263 * allocate and initialize the necessary maps
264 */
265 bmapsize = roundup(howmany(maxfsblock, CHAR_BIT), sizeof(short));
266 blockmap = Calloc((unsigned)bmapsize, sizeof (char));
267 if (blockmap == NULL) {
268 printf("cannot alloc %u bytes for blockmap\n",
269 (unsigned)bmapsize);
270 goto badsb;
271 }
272 inostathead = Calloc((unsigned)(sblock.fs_ncg),
273 sizeof(struct inostatlist));
274 if (inostathead == NULL) {
275 printf("cannot alloc %u bytes for inostathead\n",
276 (unsigned)(sizeof(struct inostatlist) * (sblock.fs_ncg)));
277 goto badsb;
278 }
279 numdirs = MAX(sblock.fs_cstotal.cs_ndir, 128);
280 dirhash = numdirs;
281 inplast = 0;
282 listmax = numdirs + 10;
283 inpsort = (struct inoinfo **)Calloc((unsigned)listmax,
284 sizeof(struct inoinfo *));
285 inphead = (struct inoinfo **)Calloc((unsigned)numdirs,
286 sizeof(struct inoinfo *));
287 if (inpsort == NULL || inphead == NULL) {
288 printf("cannot alloc %ju bytes for inphead\n",
289 (uintmax_t)numdirs * sizeof(struct inoinfo *));
290 goto badsb;
291 }
292 bufinit();
293 if (sblock.fs_flags & FS_DOSOFTDEP)
294 usedsoftdep = 1;
295 else
296 usedsoftdep = 0;
297 return (1);
298
299 badsb:
300 ckfini(0);
301 return (0);
302 }
303
304 /*
305 * Possible superblock locations ordered from most to least likely.
306 */
307 static int sblock_try[] = SBLOCKSEARCH;
308
309 #define BAD_MAGIC_MSG \
310 "The previous newfs operation on this volume did not complete.\n" \
311 "You must complete newfs before mounting this volume.\n"
312
313 /*
314 * Read in the super block and its summary info.
315 */
316 int
readsb(int listerr)317 readsb(int listerr)
318 {
319 ufs2_daddr_t super;
320 int i;
321
322 if (bflag) {
323 super = bflag;
324 readcnt[sblk.b_type]++;
325 if ((blread(fsreadfd, (char *)&sblock, super, (long)SBLOCKSIZE)))
326 return (0);
327 if (sblock.fs_magic == FS_BAD_MAGIC) {
328 fprintf(stderr, BAD_MAGIC_MSG);
329 exit(11);
330 }
331 if (sblock.fs_magic != FS_UFS1_MAGIC &&
332 sblock.fs_magic != FS_UFS2_MAGIC) {
333 fprintf(stderr, "%d is not a file system superblock\n",
334 bflag);
335 return (0);
336 }
337 } else {
338 for (i = 0; sblock_try[i] != -1; i++) {
339 super = sblock_try[i] / dev_bsize;
340 readcnt[sblk.b_type]++;
341 if ((blread(fsreadfd, (char *)&sblock, super,
342 (long)SBLOCKSIZE)))
343 return (0);
344 if (sblock.fs_magic == FS_BAD_MAGIC) {
345 fprintf(stderr, BAD_MAGIC_MSG);
346 exit(11);
347 }
348 if ((sblock.fs_magic == FS_UFS1_MAGIC ||
349 (sblock.fs_magic == FS_UFS2_MAGIC &&
350 sblock.fs_sblockloc == sblock_try[i])) &&
351 sblock.fs_ncg >= 1 &&
352 sblock.fs_bsize >= MINBSIZE &&
353 sblock.fs_sbsize >= roundup(sizeof(struct fs), dev_bsize))
354 break;
355 }
356 if (sblock_try[i] == -1) {
357 fprintf(stderr, "Cannot find file system superblock\n");
358 return (0);
359 }
360 }
361 /*
362 * Compute block size that the file system is based on,
363 * according to fsbtodb, and adjust superblock block number
364 * so we can tell if this is an alternate later.
365 */
366 super *= dev_bsize;
367 dev_bsize = sblock.fs_fsize / fsbtodb(&sblock, 1);
368 sblk.b_bno = super / dev_bsize;
369 sblk.b_size = SBLOCKSIZE;
370 if (bflag)
371 goto out;
372 /*
373 * Compare all fields that should not differ in alternate super block.
374 * When an alternate super-block is specified this check is skipped.
375 */
376 getblk(&asblk, cgsblock(&sblock, sblock.fs_ncg - 1), sblock.fs_sbsize);
377 if (asblk.b_errs)
378 return (0);
379 if (altsblock.fs_sblkno != sblock.fs_sblkno ||
380 altsblock.fs_cblkno != sblock.fs_cblkno ||
381 altsblock.fs_iblkno != sblock.fs_iblkno ||
382 altsblock.fs_dblkno != sblock.fs_dblkno ||
383 altsblock.fs_ncg != sblock.fs_ncg ||
384 altsblock.fs_bsize != sblock.fs_bsize ||
385 altsblock.fs_fsize != sblock.fs_fsize ||
386 altsblock.fs_frag != sblock.fs_frag ||
387 altsblock.fs_bmask != sblock.fs_bmask ||
388 altsblock.fs_fmask != sblock.fs_fmask ||
389 altsblock.fs_bshift != sblock.fs_bshift ||
390 altsblock.fs_fshift != sblock.fs_fshift ||
391 altsblock.fs_fragshift != sblock.fs_fragshift ||
392 altsblock.fs_fsbtodb != sblock.fs_fsbtodb ||
393 altsblock.fs_sbsize != sblock.fs_sbsize ||
394 altsblock.fs_nindir != sblock.fs_nindir ||
395 altsblock.fs_inopb != sblock.fs_inopb ||
396 altsblock.fs_cssize != sblock.fs_cssize ||
397 altsblock.fs_ipg != sblock.fs_ipg ||
398 altsblock.fs_fpg != sblock.fs_fpg ||
399 altsblock.fs_magic != sblock.fs_magic) {
400 badsb(listerr,
401 "VALUES IN SUPER BLOCK DISAGREE WITH THOSE IN FIRST ALTERNATE");
402 return (0);
403 }
404 out:
405 /*
406 * If not yet done, update UFS1 superblock with new wider fields.
407 */
408 if (sblock.fs_magic == FS_UFS1_MAGIC &&
409 sblock.fs_maxbsize != sblock.fs_bsize) {
410 sblock.fs_maxbsize = sblock.fs_bsize;
411 sblock.fs_time = sblock.fs_old_time;
412 sblock.fs_size = sblock.fs_old_size;
413 sblock.fs_dsize = sblock.fs_old_dsize;
414 sblock.fs_csaddr = sblock.fs_old_csaddr;
415 sblock.fs_cstotal.cs_ndir = sblock.fs_old_cstotal.cs_ndir;
416 sblock.fs_cstotal.cs_nbfree = sblock.fs_old_cstotal.cs_nbfree;
417 sblock.fs_cstotal.cs_nifree = sblock.fs_old_cstotal.cs_nifree;
418 sblock.fs_cstotal.cs_nffree = sblock.fs_old_cstotal.cs_nffree;
419 }
420 havesb = 1;
421 return (1);
422 }
423
424 static void
badsb(int listerr,const char * s)425 badsb(int listerr, const char *s)
426 {
427
428 if (!listerr)
429 return;
430 if (preen)
431 printf("%s: ", cdevname);
432 pfatal("BAD SUPER BLOCK: %s\n", s);
433 }
434
435 void
sblock_init(void)436 sblock_init(void)
437 {
438
439 fswritefd = -1;
440 fsmodified = 0;
441 lfdir = 0;
442 initbarea(&sblk, BT_SUPERBLK);
443 initbarea(&asblk, BT_SUPERBLK);
444 sblk.b_un.b_buf = Malloc(SBLOCKSIZE);
445 asblk.b_un.b_buf = Malloc(SBLOCKSIZE);
446 if (sblk.b_un.b_buf == NULL || asblk.b_un.b_buf == NULL)
447 errx(EEXIT, "cannot allocate space for superblock");
448 dev_bsize = secsize = DEV_BSIZE;
449 }
450