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33 * @(#)setup.c 8.10 (Berkeley) 5/9/95
34 * $FreeBSD: src/sbin/fsck/setup.c,v 1.17.2.4 2002/06/24 05:10:41 dillon Exp $
35 * $DragonFly: src/sbin/fsck/setup.c,v 1.8 2007/05/20 20:29:01 dillon Exp $
39 #include <sys/param.h>
41 #include <sys/diskslice.h>
44 #include <vfs/ufs/dinode.h>
45 #include <vfs/ufs/fs.h>
55 #define altsblock (*asblk.b_un.b_fs)
56 #define POWEROF2(num) (((num) & ((num) - 1)) == 0)
58 static void badsb(int listerr, char *s);
59 static int readsb(int listerr);
62 * Read in a superblock finding an alternate if necessary.
63 * Return 1 if successful, 0 if unsuccessful, -1 if filesystem
64 * is already clean (preen mode only).
69 long cg, size, asked, i, j;
70 long skipclean, bmapsize;
77 skipclean = fflag ? 0 : preen;
78 if (stat(dev, &statb) < 0) {
79 printf("Can't stat %s: %s\n", dev, strerror(errno));
82 if ((statb.st_mode & S_IFMT) != S_IFCHR &&
83 (statb.st_mode & S_IFMT) != S_IFBLK) {
84 pfatal("%s is not a disk device", dev);
85 if (reply("CONTINUE") == 0)
88 if ((fsreadfd = open(dev, O_RDONLY)) < 0) {
89 printf("Can't open %s: %s\n", dev, strerror(errno));
94 if (nflag || (fswritefd = open(dev, O_WRONLY)) < 0) {
97 pfatal("NO WRITE ACCESS");
98 printf(" (NO WRITE)");
106 sblk.b_un.b_buf = malloc(SBSIZE);
107 asblk.b_un.b_buf = malloc(SBSIZE);
108 if (sblk.b_un.b_buf == NULL || asblk.b_un.b_buf == NULL)
109 errx(EEXIT, "cannot allocate space for superblock");
112 * Figure out the device block size and the sector size. The
113 * block size is updated by readsb() later on.
116 struct partinfo pinfo;
118 if (ioctl(fsreadfd, DIOCGPART, &pinfo) == 0) {
119 dev_bsize = secsize = pinfo.media_blksize;
121 dev_bsize = secsize = DEV_BSIZE;
126 * Read in the superblock, looking for alternates if necessary
128 if (readsb(1) == 0) {
132 if (reply("LOOK FOR ALTERNATE SUPERBLOCKS") == 0)
135 if (readsb(0) == 0) {
137 "YOU MUST USE THE -b OPTION TO FSCK TO SPECIFY\n"
138 "THE LOCATION OF AN ALTERNATE SUPER-BLOCK TO\n"
139 "SUPPLY NEEDED INFORMATION; SEE fsck(8).");
143 pwarn("USING ALTERNATE SUPERBLOCK AT %d\n", bflag);
146 if (skipclean && sblock.fs_clean) {
147 pwarn("FILESYSTEM CLEAN; SKIPPING CHECKS\n");
150 maxfsblock = sblock.fs_size;
151 maxino = sblock.fs_ncg * sblock.fs_ipg;
153 * Check and potentially fix certain fields in the super block.
155 if (sblock.fs_optim != FS_OPTTIME && sblock.fs_optim != FS_OPTSPACE) {
156 pfatal("UNDEFINED OPTIMIZATION IN SUPERBLOCK");
157 if (reply("SET TO DEFAULT") == 1) {
158 sblock.fs_optim = FS_OPTTIME;
162 if ((sblock.fs_minfree < 0 || sblock.fs_minfree > 99)) {
163 pfatal("IMPOSSIBLE MINFREE=%d IN SUPERBLOCK",
165 if (reply("SET TO DEFAULT") == 1) {
166 sblock.fs_minfree = 10;
170 if (sblock.fs_interleave < 1 ||
171 sblock.fs_interleave > sblock.fs_nsect) {
172 pwarn("IMPOSSIBLE INTERLEAVE=%d IN SUPERBLOCK",
173 sblock.fs_interleave);
174 sblock.fs_interleave = 1;
176 printf(" (FIXED)\n");
177 if (preen || reply("SET TO DEFAULT") == 1) {
182 if (sblock.fs_npsect < sblock.fs_nsect ||
183 sblock.fs_npsect > sblock.fs_nsect*2) {
184 pwarn("IMPOSSIBLE NPSECT=%d IN SUPERBLOCK",
186 sblock.fs_npsect = sblock.fs_nsect;
188 printf(" (FIXED)\n");
189 if (preen || reply("SET TO DEFAULT") == 1) {
194 if (sblock.fs_inodefmt >= FS_44INODEFMT) {
197 sblock.fs_qbmask = ~sblock.fs_bmask;
198 sblock.fs_qfmask = ~sblock.fs_fmask;
199 /* This should match the kernel limit in ffs_oldfscompat(). */
200 sblock.fs_maxfilesize = (u_int64_t)1 << 39;
204 * Convert to new inode format.
206 if (cvtlevel >= 2 && sblock.fs_inodefmt < FS_44INODEFMT) {
208 pwarn("CONVERTING TO NEW INODE FORMAT\n");
209 else if (!reply("CONVERT TO NEW INODE FORMAT"))
212 sblock.fs_inodefmt = FS_44INODEFMT;
213 sizepb = sblock.fs_bsize;
214 sblock.fs_maxfilesize = sblock.fs_bsize * NDADDR - 1;
215 for (i = 0; i < NIADDR; i++) {
216 sizepb *= NINDIR(&sblock);
217 sblock.fs_maxfilesize += sizepb;
219 sblock.fs_maxsymlinklen = MAXSYMLINKLEN;
220 sblock.fs_qbmask = ~sblock.fs_bmask;
221 sblock.fs_qfmask = ~sblock.fs_fmask;
226 * Convert to new cylinder group format.
228 if (cvtlevel >= 1 && sblock.fs_postblformat == FS_42POSTBLFMT) {
230 pwarn("CONVERTING TO NEW CYLINDER GROUP FORMAT\n");
231 else if (!reply("CONVERT TO NEW CYLINDER GROUP FORMAT"))
234 sblock.fs_postblformat = FS_DYNAMICPOSTBLFMT;
236 sblock.fs_postbloff =
237 (char *)(&sblock.fs_opostbl[0][0]) -
238 (char *)(&sblock.fs_firstfield);
239 sblock.fs_rotbloff = &sblock.fs_space[0] -
240 (u_char *)(&sblock.fs_firstfield);
242 fragroundup(&sblock, CGSIZE(&sblock));
246 if (asblk.b_dirty && !bflag) {
247 memmove(&altsblock, &sblock, (size_t)sblock.fs_sbsize);
248 flush(fswritefd, &asblk);
251 * read in the summary info.
254 sblock.fs_csp = calloc(1, sblock.fs_cssize);
255 for (i = 0, j = 0; i < sblock.fs_cssize; i += sblock.fs_bsize, j++) {
256 size = sblock.fs_cssize - i < sblock.fs_bsize ?
257 sblock.fs_cssize - i : sblock.fs_bsize;
258 if (bread(fsreadfd, (char *)sblock.fs_csp + i,
259 fsbtodb(&sblock, sblock.fs_csaddr + j * sblock.fs_frag),
260 size) != 0 && !asked) {
261 pfatal("BAD SUMMARY INFORMATION");
262 if (reply("CONTINUE") == 0) {
270 * allocate and initialize the necessary maps
272 bmapsize = roundup(howmany(maxfsblock, NBBY), sizeof(short));
273 blockmap = calloc((unsigned)bmapsize, sizeof (char));
274 if (blockmap == NULL) {
275 printf("cannot alloc %u bytes for blockmap\n",
279 inostathead = calloc((unsigned)(sblock.fs_ncg),
280 sizeof(struct inostatlist));
281 if (inostathead == NULL) {
282 printf("cannot alloc %u bytes for inostathead\n",
283 (unsigned)(sizeof(struct inostatlist) * (sblock.fs_ncg)));
286 numdirs = sblock.fs_cstotal.cs_ndir;
289 * Calculate the directory hash table size. Do not allocate
290 * a ridiculous amount of memory if we have a lot of directories.
292 for (dirhash = 16; dirhash < numdirs; dirhash <<= 1)
294 if (dirhash > 1024*1024)
296 dirhashmask = dirhash - 1;
299 printf("numdirs is zero, try using an alternate superblock\n");
303 listmax = numdirs + 10;
304 inpsort = calloc((unsigned)listmax, sizeof(struct inoinfo *));
305 inphead = calloc((unsigned)dirhash, sizeof(struct inoinfo *));
306 if (inpsort == NULL || inphead == NULL) {
307 printf("cannot allocate base structures for %ld directories\n",
312 if (sblock.fs_flags & FS_DOSOFTDEP)
324 * Read in the super block and its summary info.
329 ufs_daddr_t super = bflag ? bflag : SBOFF / dev_bsize;
331 if (bread(fsreadfd, (char *)&sblock, super, (long)SBSIZE) != 0)
334 sblk.b_size = SBSIZE;
336 * run a few consistency checks of the super block
338 if (sblock.fs_magic != FS_MAGIC)
339 { badsb(listerr, "MAGIC NUMBER WRONG"); return (0); }
340 if (sblock.fs_ncg < 1)
341 { badsb(listerr, "NCG OUT OF RANGE"); return (0); }
342 if (sblock.fs_cpg < 1)
343 { badsb(listerr, "CPG OUT OF RANGE"); return (0); }
344 if (sblock.fs_ncg * sblock.fs_cpg < sblock.fs_ncyl ||
345 (sblock.fs_ncg - 1) * sblock.fs_cpg >= sblock.fs_ncyl)
346 { badsb(listerr, "NCYL LESS THAN NCG*CPG"); return (0); }
347 if (sblock.fs_sbsize > SBSIZE)
348 { badsb(listerr, "SIZE PREPOSTEROUSLY LARGE"); return (0); }
350 * Compute block size that the filesystem is based on,
351 * according to fsbtodb, and adjust superblock block number
352 * so we can tell if this is an alternate later.
355 dev_bsize = sblock.fs_fsize / fsbtodb(&sblock, 1);
356 sblk.b_bno = super / dev_bsize;
362 * Compare all fields that should not differ in alternate super block.
363 * When an alternate super-block is specified this check is skipped.
365 getblk(&asblk, cgsblock(&sblock, sblock.fs_ncg - 1), sblock.fs_sbsize);
368 if (altsblock.fs_sblkno != sblock.fs_sblkno ||
369 altsblock.fs_cblkno != sblock.fs_cblkno ||
370 altsblock.fs_iblkno != sblock.fs_iblkno ||
371 altsblock.fs_dblkno != sblock.fs_dblkno ||
372 altsblock.fs_cgoffset != sblock.fs_cgoffset ||
373 altsblock.fs_cgmask != sblock.fs_cgmask ||
374 altsblock.fs_ncg != sblock.fs_ncg ||
375 altsblock.fs_bsize != sblock.fs_bsize ||
376 altsblock.fs_fsize != sblock.fs_fsize ||
377 altsblock.fs_frag != sblock.fs_frag ||
378 altsblock.fs_bmask != sblock.fs_bmask ||
379 altsblock.fs_fmask != sblock.fs_fmask ||
380 altsblock.fs_bshift != sblock.fs_bshift ||
381 altsblock.fs_fshift != sblock.fs_fshift ||
382 altsblock.fs_fragshift != sblock.fs_fragshift ||
383 altsblock.fs_fsbtodb != sblock.fs_fsbtodb ||
384 altsblock.fs_sbsize != sblock.fs_sbsize ||
385 altsblock.fs_nindir != sblock.fs_nindir ||
386 altsblock.fs_inopb != sblock.fs_inopb ||
387 altsblock.fs_cssize != sblock.fs_cssize ||
388 altsblock.fs_cpg != sblock.fs_cpg ||
389 altsblock.fs_ipg != sblock.fs_ipg ||
390 altsblock.fs_fpg != sblock.fs_fpg ||
391 altsblock.fs_magic != sblock.fs_magic) {
393 "VALUES IN SUPER BLOCK DISAGREE WITH THOSE IN FIRST ALTERNATE");
401 badsb(int listerr, char *s)
407 printf("%s: ", cdevname);
408 pfatal("BAD SUPER BLOCK: %s\n", s);