/* $OpenBSD: tunefs.c,v 1.23 2003/07/10 00:00:58 david Exp $ */ /* $NetBSD: tunefs.c,v 1.10 1995/03/18 15:01:31 cgd Exp $ */ /* * Copyright (c) 1983, 1993 * The Regents of the University of California. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #ifndef lint static const char copyright[] = "@(#) Copyright (c) 1983, 1993\n\ The Regents of the University of California. All rights reserved.\n"; #endif /* not lint */ #ifndef lint #if 0 static char sccsid[] = "@(#)tunefs.c 8.2 (Berkeley) 4/19/94"; #else static const char rcsid[] = "$OpenBSD: tunefs.c,v 1.23 2003/07/10 00:00:58 david Exp $"; #endif #endif /* not lint */ /* * tunefs: change layout parameters to an existing file system. */ #include <sys/param.h> #include <sys/stat.h> #include <ufs/ffs/fs.h> #include <errno.h> #include <err.h> #include <fcntl.h> #include <fstab.h> #include <stdio.h> #include <paths.h> #include <stdlib.h> #include <string.h> #include <unistd.h> /* the optimization warning string template */ #define OPTWARN "should optimize for %s with minfree %s %d%%" union { struct fs sb; char pad[MAXBSIZE]; } sbun; #define sblock sbun.sb int fi = -1; long dev_bsize = 1; void bwrite(daddr_t, char *, int); int bread(daddr_t, char *, int); void getsb(struct fs *, char *, int); void usage(void); void printfs(void); extern char *__progname; int main(int argc, char *argv[]) { char *cp, *special, *name; struct stat st; int i; int Aflag = 0; struct fstab *fs; char *chg[2], device[MAXPATHLEN]; argc--, argv++; if (argc < 2) usage(); special = argv[argc - 1]; fs = getfsfile(special); if (fs) special = fs->fs_spec; again: if (stat(special, &st) < 0) { if (*special != '/') { if (*special == 'r') special++; (void)snprintf(device, sizeof(device), "%s%s", _PATH_DEV, special); special = device; goto again; } err(1, "%s", special); } if (!S_ISBLK(st.st_mode) && !S_ISCHR(st.st_mode)) errx(10, "%s: not a block or character device", special); for (; argc > 0 && argv[0][0] == '-'; argc--, argv++) { for (cp = &argv[0][1]; *cp; cp++) switch (*cp) { case 'A': Aflag++; continue; case 'p': getsb(&sblock, special, O_RDONLY); printfs(); return (0); case 'a': getsb(&sblock, special, O_RDWR); name = "maximum contiguous block count"; if (argc < 1) errx(10, "-a: missing %s", name); argc--, argv++; i = atoi(*argv); if (i < 1) errx(10, "%s must be >= 1 (was %s)", name, *argv); warnx("%s changes from %d to %d", name, sblock.fs_maxcontig, i); sblock.fs_maxcontig = i; continue; case 'd': getsb(&sblock, special, O_RDWR); name = "rotational delay between contiguous blocks"; if (argc < 1) errx(10, "-d: missing %s", name); argc--, argv++; i = atoi(*argv); warnx("%s changes from %dms to %dms", name, sblock.fs_rotdelay, i); sblock.fs_rotdelay = i; continue; case 'e': getsb(&sblock, special, O_RDWR); name = "maximum blocks per file in a cylinder group"; if (argc < 1) errx(10, "-e: missing %s", name); argc--, argv++; i = atoi(*argv); if (i < 1) errx(10, "%s must be >= 1 (was %s)", name, *argv); warnx("%s changes from %d to %d", name, sblock.fs_maxbpg, i); sblock.fs_maxbpg = i; continue; case 'f': getsb(&sblock, special, O_RDWR); name = "average file size"; if (argc < 1) errx(10, "-f: missing %s", name); argc--, argv++; i = atoi(*argv); if (i < 0) errx(10, "%s must be >= 0 (was %s)", name, *argv); warnx("%s changes from %d to %d", name, sblock.fs_avgfilesize, i); sblock.fs_avgfilesize = i; continue; case 'm': getsb(&sblock, special, O_RDWR); name = "minimum percentage of free space"; if (argc < 1) errx(10, "-m: missing %s", name); argc--, argv++; i = atoi(*argv); if (i < 0 || i > 99) errx(10, "bad %s (%s)", name, *argv); warnx("%s changes from %d%% to %d%%", name, sblock.fs_minfree, i); sblock.fs_minfree = i; if (i >= MINFREE && sblock.fs_optim == FS_OPTSPACE) warnx(OPTWARN, "time", ">=", MINFREE); if (i < MINFREE && sblock.fs_optim == FS_OPTTIME) warnx(OPTWARN, "space", "<", MINFREE); continue; case 'n': getsb(&sblock, special, O_RDWR); name = "expected number of files per directory"; if (argc < 1) errx(10, "-n: missing %s", name); argc--, argv++; i = atoi(*argv); if (i < 0) errx(10, "%s must be >= 0 (was %s)", name, *argv); warnx("%s changes from %d to %d", name, sblock.fs_avgfpdir, i); sblock.fs_avgfpdir = i; continue; case 's': errx(1, "See mount(8) for details about" " how to enable soft updates."); case 'o': getsb(&sblock, special, O_RDWR); name = "optimization preference"; if (argc < 1) errx(10, "-o: missing %s", name); argc--, argv++; chg[FS_OPTSPACE] = "space"; chg[FS_OPTTIME] = "time"; if (strcmp(*argv, chg[FS_OPTSPACE]) == 0) i = FS_OPTSPACE; else if (strcmp(*argv, chg[FS_OPTTIME]) == 0) i = FS_OPTTIME; else errx(10, "bad %s (options are `space' or `time')", name); if (sblock.fs_optim == i) { warnx("%s remains unchanged as %s", name, chg[i]); continue; } warnx("%s changes from %s to %s", name, chg[sblock.fs_optim], chg[i]); sblock.fs_optim = i; if (sblock.fs_minfree >= MINFREE && i == FS_OPTSPACE) warnx(OPTWARN, "time", ">=", MINFREE); if (sblock.fs_minfree < MINFREE && i == FS_OPTTIME) warnx(OPTWARN, "space", "<", MINFREE); continue; default: usage(); } } if (argc != 1) usage(); bwrite((daddr_t)SBOFF / dev_bsize, (char *)&sblock, SBSIZE); if (Aflag) for (i = 0; i < sblock.fs_ncg; i++) bwrite(fsbtodb(&sblock, cgsblock(&sblock, i)), (char *)&sblock, SBSIZE); if (close(fi)) err(1, "close: %s", special); return (0); } void usage(void) { fprintf(stderr, "Usage: %s tuneup-options special-device\n" "where tuneup-options are:\n" "\t-A modify all backups of the super-block\n" "\t-a maximum contiguous blocks\n" "\t-d rotational delay between contiguous blocks\n" "\t-e maximum blocks per file in a cylinder group\n" "\t-f expected average file size\n" "\t-m minimum percentage of free space\n" "\t-n expected number of files per directory\n" "\t-o optimization preference (`space' or `time')\n" "\t-p no change - just prints current tuneable settings\n", __progname); exit(2); } void getsb(struct fs *fs, char *file, int flags) { if (fi >= 0) return; fi = open(file, flags); if (fi < 0) err(3, "cannot open %s", file); if (bread((daddr_t)SBOFF, (char *)fs, SBSIZE)) err(4, "%s: bad super block", file); if (fs->fs_magic != FS_MAGIC) errx(5, "%s: bad magic number", file); dev_bsize = fs->fs_fsize / fsbtodb(fs, 1); } void printfs(void) { warnx("maximum contiguous block count: (-a) %d", sblock.fs_maxcontig); warnx("rotational delay between contiguous blocks: (-d) %d ms", sblock.fs_rotdelay); warnx("maximum blocks per file in a cylinder group: (-e) %d", sblock.fs_maxbpg); warnx("expected average file size: (-f) %d", sblock.fs_avgfilesize); warnx("minimum percentage of free space: (-m) %d%%", sblock.fs_minfree); warnx("expected number of files per directory: (-n) %d", sblock.fs_avgfpdir); warnx("optimization preference: (-o) %s", sblock.fs_optim == FS_OPTSPACE ? "space" : "time"); if (sblock.fs_minfree >= MINFREE && sblock.fs_optim == FS_OPTSPACE) warnx(OPTWARN, "time", ">=", MINFREE); if (sblock.fs_minfree < MINFREE && sblock.fs_optim == FS_OPTTIME) warnx(OPTWARN, "space", "<", MINFREE); } void bwrite(daddr_t blk, char *buf, int size) { if (lseek(fi, (off_t)blk * dev_bsize, SEEK_SET) < 0) err(6, "FS SEEK"); if (write(fi, buf, size) != size) err(7, "FS WRITE"); } int bread(daddr_t bno, char *buf, int cnt) { int i; if (lseek(fi, (off_t)bno * dev_bsize, SEEK_SET) < 0) return(1); if ((i = read(fi, buf, cnt)) != cnt) { for(i=0; i<sblock.fs_bsize; i++) buf[i] = 0; return (1); } return (0); }