| 1 | #ifndef lint |
| 2 | static char version[] = "@(#)setup.c 3.6 (Berkeley) %G%"; |
| 3 | #endif |
| 4 | |
| 5 | #include <sys/param.h> |
| 6 | #include <sys/inode.h> |
| 7 | #include <sys/fs.h> |
| 8 | #include <sys/stat.h> |
| 9 | #include "fsck.h" |
| 10 | |
| 11 | char *calloc(); |
| 12 | |
| 13 | setup(dev) |
| 14 | char *dev; |
| 15 | { |
| 16 | dev_t rootdev; |
| 17 | struct stat statb; |
| 18 | daddr_t super = bflag ? bflag : SBLOCK; |
| 19 | int i, j; |
| 20 | long size; |
| 21 | BUFAREA asblk; |
| 22 | # define altsblock asblk.b_un.b_fs |
| 23 | |
| 24 | if (stat("/", &statb) < 0) |
| 25 | errexit("Can't stat root\n"); |
| 26 | rootdev = statb.st_dev; |
| 27 | if (stat(dev, &statb) < 0) { |
| 28 | printf("Can't stat %s\n", dev); |
| 29 | return (0); |
| 30 | } |
| 31 | rawflg = 0; |
| 32 | if ((statb.st_mode & S_IFMT) == S_IFBLK) |
| 33 | ; |
| 34 | else if ((statb.st_mode & S_IFMT) == S_IFCHR) |
| 35 | rawflg++; |
| 36 | else { |
| 37 | if (reply("file is not a block or character device; OK") == 0) |
| 38 | return (0); |
| 39 | } |
| 40 | if (rootdev == statb.st_rdev) |
| 41 | hotroot++; |
| 42 | if ((dfile.rfdes = open(dev, 0)) < 0) { |
| 43 | printf("Can't open %s\n", dev); |
| 44 | return (0); |
| 45 | } |
| 46 | if (preen == 0) |
| 47 | printf("** %s", dev); |
| 48 | if (nflag || (dfile.wfdes = open(dev, 1)) < 0) { |
| 49 | dfile.wfdes = -1; |
| 50 | if (preen) |
| 51 | pfatal("NO WRITE ACCESS"); |
| 52 | printf(" (NO WRITE)"); |
| 53 | } |
| 54 | if (preen == 0) |
| 55 | printf("\n"); |
| 56 | dfile.mod = 0; |
| 57 | lfdir = 0; |
| 58 | initbarea(&sblk); |
| 59 | initbarea(&fileblk); |
| 60 | initbarea(&inoblk); |
| 61 | initbarea(&cgblk); |
| 62 | initbarea(&asblk); |
| 63 | /* |
| 64 | * Read in the super block and its summary info. |
| 65 | */ |
| 66 | if (bread(&dfile, (char *)&sblock, super, (long)SBSIZE) != 0) |
| 67 | return (0); |
| 68 | sblk.b_bno = super; |
| 69 | sblk.b_size = SBSIZE; |
| 70 | /* |
| 71 | * run a few consistency checks of the super block |
| 72 | */ |
| 73 | if (sblock.fs_magic != FS_MAGIC) |
| 74 | { badsb("MAGIC NUMBER WRONG"); return (0); } |
| 75 | if (sblock.fs_ncg < 1) |
| 76 | { badsb("NCG OUT OF RANGE"); return (0); } |
| 77 | if (sblock.fs_cpg < 1 || sblock.fs_cpg > MAXCPG) |
| 78 | { badsb("CPG OUT OF RANGE"); return (0); } |
| 79 | if (sblock.fs_ncg * sblock.fs_cpg < sblock.fs_ncyl || |
| 80 | (sblock.fs_ncg - 1) * sblock.fs_cpg >= sblock.fs_ncyl) |
| 81 | { badsb("NCYL DOES NOT JIVE WITH NCG*CPG"); return (0); } |
| 82 | if (sblock.fs_sbsize > SBSIZE) |
| 83 | { badsb("SIZE PREPOSTEROUSLY LARGE"); return (0); } |
| 84 | /* |
| 85 | * Set all possible fields that could differ, then do check |
| 86 | * of whole super block against an alternate super block. |
| 87 | * When an alternate super-block is specified this check is skipped. |
| 88 | */ |
| 89 | if (bflag) |
| 90 | goto sbok; |
| 91 | getblk(&asblk, cgsblock(&sblock, sblock.fs_ncg - 1), sblock.fs_sbsize); |
| 92 | if (asblk.b_errs != NULL) |
| 93 | return (0); |
| 94 | altsblock.fs_link = sblock.fs_link; |
| 95 | altsblock.fs_rlink = sblock.fs_rlink; |
| 96 | altsblock.fs_time = sblock.fs_time; |
| 97 | altsblock.fs_cstotal = sblock.fs_cstotal; |
| 98 | altsblock.fs_cgrotor = sblock.fs_cgrotor; |
| 99 | altsblock.fs_fmod = sblock.fs_fmod; |
| 100 | altsblock.fs_clean = sblock.fs_clean; |
| 101 | altsblock.fs_ronly = sblock.fs_ronly; |
| 102 | altsblock.fs_flags = sblock.fs_flags; |
| 103 | altsblock.fs_maxcontig = sblock.fs_maxcontig; |
| 104 | altsblock.fs_minfree = sblock.fs_minfree; |
| 105 | altsblock.fs_rotdelay = sblock.fs_rotdelay; |
| 106 | altsblock.fs_maxbpg = sblock.fs_maxbpg; |
| 107 | bcopy((char *)sblock.fs_csp, (char *)altsblock.fs_csp, |
| 108 | sizeof sblock.fs_csp); |
| 109 | bcopy((char *)sblock.fs_fsmnt, (char *)altsblock.fs_fsmnt, |
| 110 | sizeof sblock.fs_fsmnt); |
| 111 | if (bcmp((char *)&sblock, (char *)&altsblock, (int)sblock.fs_sbsize)) |
| 112 | { badsb("TRASHED VALUES IN SUPER BLOCK"); return (0); } |
| 113 | sbok: |
| 114 | fmax = sblock.fs_size; |
| 115 | imax = sblock.fs_ncg * sblock.fs_ipg; |
| 116 | /* |
| 117 | * read in the summary info. |
| 118 | */ |
| 119 | for (i = 0, j = 0; i < sblock.fs_cssize; i += sblock.fs_bsize, j++) { |
| 120 | size = sblock.fs_cssize - i < sblock.fs_bsize ? |
| 121 | sblock.fs_cssize - i : sblock.fs_bsize; |
| 122 | sblock.fs_csp[j] = (struct csum *)calloc(1, (unsigned)size); |
| 123 | if (bread(&dfile, (char *)sblock.fs_csp[j], |
| 124 | fsbtodb(&sblock, sblock.fs_csaddr + j * sblock.fs_frag), |
| 125 | size) != 0) |
| 126 | return (0); |
| 127 | } |
| 128 | /* |
| 129 | * allocate and initialize the necessary maps |
| 130 | */ |
| 131 | bmapsz = roundup(howmany(fmax, NBBY), sizeof(short)); |
| 132 | blockmap = calloc((unsigned)bmapsz, sizeof (char)); |
| 133 | if (blockmap == NULL) { |
| 134 | printf("cannot alloc %d bytes for blockmap\n", bmapsz); |
| 135 | goto badsb; |
| 136 | } |
| 137 | statemap = calloc((unsigned)(imax + 1), sizeof(char)); |
| 138 | if (statemap == NULL) { |
| 139 | printf("cannot alloc %d bytes for statemap\n", imax + 1); |
| 140 | goto badsb; |
| 141 | } |
| 142 | lncntp = (short *)calloc((unsigned)(imax + 1), sizeof(short)); |
| 143 | if (lncntp == NULL) { |
| 144 | printf("cannot alloc %d bytes for lncntp\n", |
| 145 | (imax + 1) * sizeof(short)); |
| 146 | goto badsb; |
| 147 | } |
| 148 | |
| 149 | return (1); |
| 150 | |
| 151 | badsb: |
| 152 | ckfini(); |
| 153 | return (0); |
| 154 | # undef altsblock |
| 155 | } |
| 156 | |
| 157 | badsb(s) |
| 158 | char *s; |
| 159 | { |
| 160 | |
| 161 | if (preen) |
| 162 | printf("%s: ", devname); |
| 163 | printf("BAD SUPER BLOCK: %s\n", s); |
| 164 | pwarn("USE -b OPTION TO FSCK TO SPECIFY LOCATION OF AN ALTERNATE\n"); |
| 165 | pfatal("SUPER-BLOCK TO SUPPLY NEEDED INFORMATION; SEE fsck(8).\n"); |
| 166 | } |