| 1 | /* |
| 2 | * Copyright (c) 1983 Regents of the University of California. |
| 3 | * All rights reserved. The Berkeley software License Agreement |
| 4 | * specifies the terms and conditions for redistribution. |
| 5 | */ |
| 6 | |
| 7 | #ifndef lint |
| 8 | char copyright[] = |
| 9 | "@(#) Copyright (c) 1983 Regents of the University of California.\n\ |
| 10 | All rights reserved.\n"; |
| 11 | #endif not lint |
| 12 | |
| 13 | #ifndef lint |
| 14 | static char sccsid[] = "@(#)tunefs.c 5.1 (Berkeley) %G%"; |
| 15 | #endif not lint |
| 16 | |
| 17 | /* |
| 18 | * tunefs: change layout parameters to an existing file system. |
| 19 | */ |
| 20 | |
| 21 | #include <sys/param.h> |
| 22 | #include <sys/stat.h> |
| 23 | #include <sys/fs.h> |
| 24 | #include <sys/inode.h> |
| 25 | |
| 26 | #include <stdio.h> |
| 27 | #include <fstab.h> |
| 28 | |
| 29 | union { |
| 30 | struct fs sb; |
| 31 | char pad[MAXBSIZE]; |
| 32 | } sbun; |
| 33 | #define sblock sbun.sb |
| 34 | |
| 35 | int fi; |
| 36 | |
| 37 | main(argc, argv) |
| 38 | int argc; |
| 39 | char *argv[]; |
| 40 | { |
| 41 | char *cp, *special, *name; |
| 42 | struct stat st; |
| 43 | int i; |
| 44 | int Aflag = 0; |
| 45 | char device[MAXPATHLEN]; |
| 46 | extern char *sprintf(); |
| 47 | struct fstab *fs; |
| 48 | |
| 49 | argc--, argv++; |
| 50 | if (argc < 2) |
| 51 | goto usage; |
| 52 | special = argv[argc - 1]; |
| 53 | fs = getfsfile(special); |
| 54 | if (fs) |
| 55 | special = fs->fs_spec; |
| 56 | again: |
| 57 | if (stat(special, &st) < 0) { |
| 58 | if (*special != '/') { |
| 59 | if (*special == 'r') |
| 60 | special++; |
| 61 | special = sprintf(device, "/dev/%s", special); |
| 62 | goto again; |
| 63 | } |
| 64 | fprintf(stderr, "tunefs: "); perror(special); |
| 65 | exit(1); |
| 66 | } |
| 67 | if ((st.st_mode & S_IFMT) != S_IFBLK && |
| 68 | (st.st_mode & S_IFMT) != S_IFCHR) |
| 69 | fatal("%s: not a block or character device", special); |
| 70 | getsb(&sblock, special); |
| 71 | for (; argc > 0 && argv[0][0] == '-'; argc--, argv++) { |
| 72 | for (cp = &argv[0][1]; *cp; cp++) |
| 73 | switch (*cp) { |
| 74 | |
| 75 | case 'A': |
| 76 | Aflag++; |
| 77 | continue; |
| 78 | |
| 79 | case 'a': |
| 80 | name = "maximum contiguous block count"; |
| 81 | if (argc < 1) |
| 82 | fatal("-a: missing %s", name); |
| 83 | argc--, argv++; |
| 84 | i = atoi(*argv); |
| 85 | if (i < 1) |
| 86 | fatal("%s: %s must be >= 1", |
| 87 | *argv, name); |
| 88 | fprintf(stdout, "%s changes from %d to %d\n", |
| 89 | name, sblock.fs_maxcontig, i); |
| 90 | sblock.fs_maxcontig = i; |
| 91 | continue; |
| 92 | |
| 93 | case 'd': |
| 94 | name = |
| 95 | "rotational delay between contiguous blocks"; |
| 96 | if (argc < 1) |
| 97 | fatal("-d: missing %s", name); |
| 98 | argc--, argv++; |
| 99 | i = atoi(*argv); |
| 100 | if (i < 0) |
| 101 | fatal("%s: bad %s", *argv, name); |
| 102 | fprintf(stdout, |
| 103 | "%s changes from %dms to %dms\n", |
| 104 | name, sblock.fs_rotdelay, i); |
| 105 | sblock.fs_rotdelay = i; |
| 106 | continue; |
| 107 | |
| 108 | case 'e': |
| 109 | name = |
| 110 | "maximum blocks per file in a cylinder group"; |
| 111 | if (argc < 1) |
| 112 | fatal("-e: missing %s", name); |
| 113 | argc--, argv++; |
| 114 | i = atoi(*argv); |
| 115 | if (i < 1) |
| 116 | fatal("%s: %s must be >= 1", |
| 117 | *argv, name); |
| 118 | fprintf(stdout, "%s changes from %d to %d\n", |
| 119 | name, sblock.fs_maxbpg, i); |
| 120 | sblock.fs_maxbpg = i; |
| 121 | continue; |
| 122 | |
| 123 | case 'm': |
| 124 | name = "minimum percentage of free space"; |
| 125 | if (argc < 1) |
| 126 | fatal("-m: missing %s", name); |
| 127 | argc--, argv++; |
| 128 | i = atoi(*argv); |
| 129 | if (i < 0 || i > 99) |
| 130 | fatal("%s: bad %s", *argv, name); |
| 131 | fprintf(stdout, |
| 132 | "%s changes from %d%% to %d%%\n", |
| 133 | name, sblock.fs_minfree, i); |
| 134 | sblock.fs_minfree = i; |
| 135 | continue; |
| 136 | |
| 137 | default: |
| 138 | fatal("-%c: unknown flag", *cp); |
| 139 | } |
| 140 | } |
| 141 | if (argc != 1) |
| 142 | goto usage; |
| 143 | bwrite(SBLOCK, (char *)&sblock, SBSIZE); |
| 144 | if (Aflag) |
| 145 | for (i = 0; i < sblock.fs_ncg; i++) |
| 146 | bwrite(fsbtodb(&sblock, cgsblock(&sblock, i)), |
| 147 | (char *)&sblock, SBSIZE); |
| 148 | close(fi); |
| 149 | exit(0); |
| 150 | usage: |
| 151 | fprintf(stderr, "Usage: tunefs tuneup-options special-device\n"); |
| 152 | fprintf(stderr, "where tuneup-options are:\n"); |
| 153 | fprintf(stderr, "\t-a maximum contiguous blocks\n"); |
| 154 | fprintf(stderr, "\t-d rotational delay between contiguous blocks\n"); |
| 155 | fprintf(stderr, "\t-e maximum blocks per file in a cylinder group\n"); |
| 156 | fprintf(stderr, "\t-m minimum percentage of free space\n"); |
| 157 | exit(2); |
| 158 | } |
| 159 | |
| 160 | getsb(fs, file) |
| 161 | register struct fs *fs; |
| 162 | char *file; |
| 163 | { |
| 164 | |
| 165 | fi = open(file, 2); |
| 166 | if (fi < 0) { |
| 167 | fprintf(stderr, "cannot open"); |
| 168 | perror(file); |
| 169 | exit(3); |
| 170 | } |
| 171 | if (bread(SBLOCK, (char *)fs, SBSIZE)) { |
| 172 | fprintf(stderr, "bad super block"); |
| 173 | perror(file); |
| 174 | exit(4); |
| 175 | } |
| 176 | if (fs->fs_magic != FS_MAGIC) { |
| 177 | fprintf(stderr, "%s: bad magic number\n", file); |
| 178 | exit(5); |
| 179 | } |
| 180 | } |
| 181 | |
| 182 | bwrite(blk, buf, size) |
| 183 | char *buf; |
| 184 | daddr_t blk; |
| 185 | register size; |
| 186 | { |
| 187 | if (lseek(fi, blk * DEV_BSIZE, 0) < 0) { |
| 188 | perror("FS SEEK"); |
| 189 | exit(6); |
| 190 | } |
| 191 | if (write(fi, buf, size) != size) { |
| 192 | perror("FS WRITE"); |
| 193 | exit(7); |
| 194 | } |
| 195 | } |
| 196 | |
| 197 | bread(bno, buf, cnt) |
| 198 | daddr_t bno; |
| 199 | char *buf; |
| 200 | { |
| 201 | register i; |
| 202 | |
| 203 | if (lseek(fi, bno * DEV_BSIZE, 0) < 0) |
| 204 | return(1); |
| 205 | if ((i = read(fi, buf, cnt)) != cnt) { |
| 206 | for(i=0; i<sblock.fs_bsize; i++) |
| 207 | buf[i] = 0; |
| 208 | return (1); |
| 209 | } |
| 210 | return (0); |
| 211 | } |
| 212 | |
| 213 | /* VARARGS1 */ |
| 214 | fatal(fmt, arg1, arg2) |
| 215 | char *fmt, *arg1, *arg2; |
| 216 | { |
| 217 | |
| 218 | fprintf(stderr, "tunefs: "); |
| 219 | fprintf(stderr, fmt, arg1, arg2); |
| 220 | putc('\n', stderr); |
| 221 | exit(10); |
| 222 | } |