/* * 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. * * @(#) Copyright (c) 1983, 1993 The Regents of the University of California. All rights reserved. * @(#)tunefs.c 8.2 (Berkeley) 4/19/94 * $FreeBSD: src/sbin/tunefs/tunefs.c,v 1.11.2.5 2001/10/14 21:50:39 iedowse Exp $ */ /* * tunefs: change layout parameters to an existing file system. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include /* 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; long dev_bsize = 1; void bwrite(daddr_t, const char *, int); int bread(daddr_t, char *, int); void getsb(struct fs *, const char *); void putsb(struct fs *, const char *, int); void usage(void) __dead2; void printfs(void); int main(int argc, char **argv) { char *cp, *special; const char *name, *action; struct stat st; int i; int Aflag = 0, active = 0; struct fstab *fs; const char *chg[2]; char device[MAXPATHLEN]; struct ufs_args args; struct statfs stfs; argc--, argv++; if (argc < 2) usage(); special = argv[argc - 1]; fs = getfsfile(special); if (fs) { if (statfs(special, &stfs) == 0 && strcmp(special, stfs.f_mntonname) == 0) { active = 1; } special = fs->fs_spec; } again: if (stat(special, &st) < 0) { if (*special != '/') { if (*special == 'r') special++; snprintf(device, sizeof(device), "%s%s", _PATH_DEV, special); special = device; goto again; } err(1, "%s", special); } if (fs == NULL && (st.st_mode & S_IFMT) == S_IFDIR) errx(10, "%s: unknown file system", special); getsb(&sblock, special); for (; argc > 0 && argv[0][0] == '-'; argc--, argv++) { for (cp = &argv[0][1]; *cp; cp++) switch (*cp) { case 'A': Aflag++; continue; case 'p': printfs(); exit(0); case 'a': 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': 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': 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': name = "average file size"; 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); if (sblock.fs_avgfilesize == i) { warnx("%s remains unchanged as %d", name, i); } else { warnx("%s changes from %d to %d", name, sblock.fs_avgfilesize, i); sblock.fs_avgfilesize = i; } break; case 'm': 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': name = "soft updates"; if (argc < 1) errx(10, "-n: missing %s", name); argc--, argv++; if (strcmp(*argv, "enable") == 0) { sblock.fs_flags |= FS_DOSOFTDEP; action = "set"; } else if (strcmp(*argv, "disable") == 0) { sblock.fs_flags &= ~FS_DOSOFTDEP; action = "cleared"; } else { errx(10, "bad %s (options are %s)", name, "`enable' or `disable'"); } warnx("%s %s", name, action); continue; case 'o': 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; case 's': name = "expected number of files per directory"; 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); if (sblock.fs_avgfpdir == i) { warnx("%s remains unchanged as %d", name, i); } else { warnx("%s changes from %d to %d", name, sblock.fs_avgfpdir, i); sblock.fs_avgfpdir = i; } break; default: usage(); } } if (argc != 1) usage(); putsb(&sblock, special, Aflag); if (active) { bzero(&args, sizeof(args)); if (mount("ufs", fs->fs_file, stfs.f_flags | MNT_UPDATE | MNT_RELOAD, &args) < 0) err(9, "%s: reload", special); warnx("file system reloaded"); } exit(0); } void usage(void) { fprintf(stderr, "%s\n%s\n%s\n", "usage: tunefs [-Ap] [-a maxcontig] [-d rotdelay] [-e maxbpg] [-f avgfilesize]", " [-m minfree] [-n enable | disable] [-o space | time]", " [-s filesperdir] {special | filesystem}"); exit(2); } void getsb(struct fs *fs, const char *file) { fi = open(file, O_RDONLY); 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 putsb(struct fs *fs, const char *file, int all) { int i; /* * Re-open the device read-write. Use the read-only file * descriptor as an interlock to prevent the device from * being mounted while we are switching mode. */ i = fi; fi = open(file, O_RDWR); close(i); if (fi < 0) err(3, "cannot open %s", file); bwrite((daddr_t)SBOFF / dev_bsize, (const char *)fs, SBSIZE); if (all) for (i = 0; i < fs->fs_ncg; i++) bwrite(fsbtodb(fs, cgsblock(fs, i)), (const char *)fs, SBSIZE); close(fi); } void printfs(void) { warnx("soft updates: (-n) %s", (sblock.fs_flags & FS_DOSOFTDEP)? "enabled" : "disabled"); 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("average file size: (-f) %d", sblock.fs_avgfilesize); warnx("average number of files in a directory: (-s) %d", sblock.fs_avgfpdir); warnx("minimum percentage of free space: (-m) %d%%", sblock.fs_minfree); 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, const 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