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29 * @(#)setup.c 8.10 (Berkeley) 5/9/95
30 * $FreeBSD: src/sbin/fsck/setup.c,v 1.17.2.4 2002/06/24 05:10:41 dillon Exp $
34 #include <sys/param.h>
36 #include <sys/diskslice.h>
39 #include <vfs/ufs/dinode.h>
40 #include <vfs/ufs/fs.h>
50 #define altsblock (*asblk.b_un.b_fs)
51 #define POWEROF2(num) (((num) & ((num) - 1)) == 0)
53 static void badsb(int listerr, char *s);
54 static int readsb(int listerr);
57 * Read in a superblock finding an alternate if necessary.
58 * Return 1 if successful, 0 if unsuccessful, -1 if filesystem
59 * is already clean (preen mode only).
64 long size, asked, i, j;
65 long skipclean, bmapsize;
71 skipclean = fflag ? 0 : preen;
72 if (stat(dev, &statb) < 0) {
73 printf("Can't stat %s: %s\n", dev, strerror(errno));
76 if ((statb.st_mode & S_IFMT) != S_IFCHR &&
77 (statb.st_mode & S_IFMT) != S_IFBLK) {
78 pfatal("%s is not a disk device", dev);
79 if (reply("CONTINUE") == 0)
82 if ((fsreadfd = open(dev, O_RDONLY)) < 0) {
83 printf("Can't open %s: %s\n", dev, strerror(errno));
88 if (nflag || (fswritefd = open(dev, O_WRONLY)) < 0) {
91 pfatal("NO WRITE ACCESS");
92 printf(" (NO WRITE)");
100 sblk.b_un.b_buf = malloc(SBSIZE);
101 asblk.b_un.b_buf = malloc(SBSIZE);
102 if (sblk.b_un.b_buf == NULL || asblk.b_un.b_buf == NULL)
103 errx(EEXIT, "cannot allocate space for superblock");
106 * Figure out the device block size and the sector size. The
107 * block size is updated by readsb() later on.
110 struct partinfo pinfo;
112 if (ioctl(fsreadfd, DIOCGPART, &pinfo) == 0) {
113 dev_bsize = secsize = pinfo.media_blksize;
115 dev_bsize = secsize = DEV_BSIZE;
120 * Read in the superblock, looking for alternates if necessary
122 if (readsb(1) == 0) {
126 if (reply("LOOK FOR ALTERNATE SUPERBLOCKS") == 0)
129 if (readsb(0) == 0) {
131 "YOU MUST USE THE -b OPTION TO FSCK TO SPECIFY\n"
132 "THE LOCATION OF AN ALTERNATE SUPER-BLOCK TO\n"
133 "SUPPLY NEEDED INFORMATION; SEE fsck(8).");
137 pwarn("USING ALTERNATE SUPERBLOCK AT %d\n", bflag);
140 if (skipclean && sblock.fs_clean) {
141 pwarn("FILESYSTEM CLEAN; SKIPPING CHECKS\n");
144 maxfsblock = sblock.fs_size;
145 maxino = sblock.fs_ncg * sblock.fs_ipg;
147 * Check and potentially fix certain fields in the super block.
149 if (sblock.fs_optim != FS_OPTTIME && sblock.fs_optim != FS_OPTSPACE) {
150 pfatal("UNDEFINED OPTIMIZATION IN SUPERBLOCK");
151 if (reply("SET TO DEFAULT") == 1) {
152 sblock.fs_optim = FS_OPTTIME;
156 if ((sblock.fs_minfree < 0 || sblock.fs_minfree > 99)) {
157 pfatal("IMPOSSIBLE MINFREE=%d IN SUPERBLOCK",
159 if (reply("SET TO DEFAULT") == 1) {
160 sblock.fs_minfree = 10;
164 if (sblock.fs_interleave < 1 ||
165 sblock.fs_interleave > sblock.fs_nsect) {
166 pwarn("IMPOSSIBLE INTERLEAVE=%d IN SUPERBLOCK",
167 sblock.fs_interleave);
168 sblock.fs_interleave = 1;
170 printf(" (FIXED)\n");
171 if (preen || reply("SET TO DEFAULT") == 1) {
176 if (sblock.fs_npsect < sblock.fs_nsect ||
177 sblock.fs_npsect > sblock.fs_nsect*2) {
178 pwarn("IMPOSSIBLE NPSECT=%d IN SUPERBLOCK",
180 sblock.fs_npsect = sblock.fs_nsect;
182 printf(" (FIXED)\n");
183 if (preen || reply("SET TO DEFAULT") == 1) {
188 if (sblock.fs_inodefmt >= FS_44INODEFMT) {
191 sblock.fs_qbmask = ~sblock.fs_bmask;
192 sblock.fs_qfmask = ~sblock.fs_fmask;
193 /* This should match the kernel limit in ffs_oldfscompat(). */
194 sblock.fs_maxfilesize = (u_int64_t)1 << 39;
198 * Convert to new inode format.
200 if (cvtlevel >= 2 && sblock.fs_inodefmt < FS_44INODEFMT) {
202 pwarn("CONVERTING TO NEW INODE FORMAT\n");
203 else if (!reply("CONVERT TO NEW INODE FORMAT"))
206 sblock.fs_inodefmt = FS_44INODEFMT;
207 sizepb = sblock.fs_bsize;
208 sblock.fs_maxfilesize = sblock.fs_bsize * NDADDR - 1;
209 for (i = 0; i < NIADDR; i++) {
210 sizepb *= NINDIR(&sblock);
211 sblock.fs_maxfilesize += sizepb;
213 sblock.fs_maxsymlinklen = MAXSYMLINKLEN;
214 sblock.fs_qbmask = ~sblock.fs_bmask;
215 sblock.fs_qfmask = ~sblock.fs_fmask;
220 * Convert to new cylinder group format.
222 if (cvtlevel >= 1 && sblock.fs_postblformat == FS_42POSTBLFMT) {
224 pwarn("CONVERTING TO NEW CYLINDER GROUP FORMAT\n");
225 else if (!reply("CONVERT TO NEW CYLINDER GROUP FORMAT"))
228 sblock.fs_postblformat = FS_DYNAMICPOSTBLFMT;
230 sblock.fs_postbloff =
231 (char *)(&sblock.fs_opostbl[0][0]) -
232 (char *)(&sblock.fs_firstfield);
233 sblock.fs_rotbloff = &sblock.fs_space[0] -
234 (u_char *)(&sblock.fs_firstfield);
236 fragroundup(&sblock, CGSIZE(&sblock));
240 if (asblk.b_dirty && !bflag) {
241 memmove(&altsblock, &sblock, (size_t)sblock.fs_sbsize);
242 flush(fswritefd, &asblk);
245 * read in the summary info.
248 sblock.fs_csp = calloc(1, sblock.fs_cssize);
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 if (bread(fsreadfd, (char *)sblock.fs_csp + i,
253 fsbtodb(&sblock, sblock.fs_csaddr + j * sblock.fs_frag),
254 size) != 0 && !asked) {
255 pfatal("BAD SUMMARY INFORMATION");
256 if (reply("CONTINUE") == 0) {
264 * allocate and initialize the necessary maps
266 bmapsize = roundup(howmany(maxfsblock, NBBY), sizeof(short));
267 blockmap = calloc((unsigned)bmapsize, sizeof (char));
268 if (blockmap == NULL) {
269 printf("cannot alloc %u bytes for blockmap\n",
273 inostathead = calloc((unsigned)(sblock.fs_ncg),
274 sizeof(struct inostatlist));
275 if (inostathead == NULL) {
276 printf("cannot alloc %u bytes for inostathead\n",
277 (unsigned)(sizeof(struct inostatlist) * (sblock.fs_ncg)));
280 numdirs = sblock.fs_cstotal.cs_ndir;
283 * Calculate the directory hash table size. Do not allocate
284 * a ridiculous amount of memory if we have a lot of directories.
286 for (dirhash = 16; dirhash < numdirs; dirhash <<= 1)
288 if (dirhash > 1024*1024)
290 dirhashmask = dirhash - 1;
293 printf("numdirs is zero, try using an alternate superblock\n");
297 listmax = numdirs + 10;
298 inpsort = calloc((unsigned)listmax, sizeof(struct inoinfo *));
299 inphead = calloc((unsigned)dirhash, sizeof(struct inoinfo *));
300 if (inpsort == NULL || inphead == NULL) {
301 printf("cannot allocate base structures for %ld directories\n",
306 if (sblock.fs_flags & FS_DOSOFTDEP)
318 * Read in the super block and its summary info.
323 ufs_daddr_t super = bflag ? bflag : SBOFF / dev_bsize;
325 if (bread(fsreadfd, (char *)&sblock, super, (long)SBSIZE) != 0)
328 sblk.b_size = SBSIZE;
330 * run a few consistency checks of the super block
332 if (sblock.fs_magic != FS_MAGIC)
333 { badsb(listerr, "MAGIC NUMBER WRONG"); return (0); }
334 if (sblock.fs_ncg < 1)
335 { badsb(listerr, "NCG OUT OF RANGE"); return (0); }
336 if (sblock.fs_cpg < 1)
337 { badsb(listerr, "CPG OUT OF RANGE"); return (0); }
338 if (sblock.fs_ncg * sblock.fs_cpg < sblock.fs_ncyl ||
339 (sblock.fs_ncg - 1) * sblock.fs_cpg >= sblock.fs_ncyl)
340 { badsb(listerr, "NCYL LESS THAN NCG*CPG"); return (0); }
341 if (sblock.fs_sbsize > SBSIZE)
342 { badsb(listerr, "SIZE PREPOSTEROUSLY LARGE"); return (0); }
344 * Compute block size that the filesystem is based on,
345 * according to fsbtodb, and adjust superblock block number
346 * so we can tell if this is an alternate later.
349 dev_bsize = sblock.fs_fsize / fsbtodb(&sblock, 1);
350 sblk.b_bno = super / dev_bsize;
356 * Compare all fields that should not differ in alternate super block.
357 * When an alternate super-block is specified this check is skipped.
359 getblk(&asblk, cgsblock(&sblock, sblock.fs_ncg - 1), sblock.fs_sbsize);
362 if (altsblock.fs_sblkno != sblock.fs_sblkno ||
363 altsblock.fs_cblkno != sblock.fs_cblkno ||
364 altsblock.fs_iblkno != sblock.fs_iblkno ||
365 altsblock.fs_dblkno != sblock.fs_dblkno ||
366 altsblock.fs_cgoffset != sblock.fs_cgoffset ||
367 altsblock.fs_cgmask != sblock.fs_cgmask ||
368 altsblock.fs_ncg != sblock.fs_ncg ||
369 altsblock.fs_bsize != sblock.fs_bsize ||
370 altsblock.fs_fsize != sblock.fs_fsize ||
371 altsblock.fs_frag != sblock.fs_frag ||
372 altsblock.fs_bmask != sblock.fs_bmask ||
373 altsblock.fs_fmask != sblock.fs_fmask ||
374 altsblock.fs_bshift != sblock.fs_bshift ||
375 altsblock.fs_fshift != sblock.fs_fshift ||
376 altsblock.fs_fragshift != sblock.fs_fragshift ||
377 altsblock.fs_fsbtodb != sblock.fs_fsbtodb ||
378 altsblock.fs_sbsize != sblock.fs_sbsize ||
379 altsblock.fs_nindir != sblock.fs_nindir ||
380 altsblock.fs_inopb != sblock.fs_inopb ||
381 altsblock.fs_cssize != sblock.fs_cssize ||
382 altsblock.fs_cpg != sblock.fs_cpg ||
383 altsblock.fs_ipg != sblock.fs_ipg ||
384 altsblock.fs_fpg != sblock.fs_fpg ||
385 altsblock.fs_magic != sblock.fs_magic) {
387 "VALUES IN SUPER BLOCK DISAGREE WITH THOSE IN FIRST ALTERNATE");
395 badsb(int listerr, char *s)
401 printf("%s: ", cdevname);
402 pfatal("BAD SUPER BLOCK: %s\n", s);