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Document -n (soft-update) flag.

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Add rcsid, remove unused #includes. Sync usage() and SYNOPSIS.
This commit is contained in:
Philippe Charnier 1998-08-03 06:41:20 +00:00
parent e798a806ce
commit 8679b1b4d8
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=38040
2 changed files with 21 additions and 21 deletions
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19
sbin/tunefs/tunefs.8
View File

@ -30,6 +30,7 @@
.\" SUCH DAMAGE.
.\"
.\" @(#)tunefs.8 8.2 (Berkeley) 12/11/93
.\" $Id$
.\"
.Dd December 11, 1993
.Dt TUNEFS 8
@ -46,23 +47,23 @@
.Op Fl m Ar minfree
.Op Fl p
.Bk -words
.Op Fl n Ar soft_dependency_enabling
.Op Fl n Ar enable | disable
.Op Fl o Ar optimize_preference
.Ek
.Op Ar special | Ar filesys
.Op Ar special | Ar filesystem
.Sh DESCRIPTION
.Nm Tunefs
is designed to change the dynamic parameters of a file system
which affect the layout policies.
The parameters which are to be changed are indicated by the flags
given below:
.Bl -tag -width Ds
.Bl -tag -width indent
.It Fl A
The file system has several backups of the super-block. Specifying
this option will cause all backups to be modified as well as the
primary super-block. This is potentially dangerous - use with caution.
.It Fl a Ar maxcontig
This specifies the maximum number of contiguous blocks that will
Specify the maximum number of contiguous blocks that will
be laid out before forcing a rotational delay (see
.Fl d
below).
@ -71,13 +72,13 @@ an interrupt per disk transfer.
Device drivers that can chain several buffers together in a single
transfer should set this to the maximum chain length.
.It Fl d Ar rotdelay
This specifies the expected time (in milliseconds)
Specify the expected time (in milliseconds)
to service a transfer completion
interrupt and initiate a new transfer on the same disk.
It is used to decide how much rotational spacing to place between
successive blocks in a file.
.It Fl e Ar maxbpg
This indicates the maximum number of blocks any single file can
Indicate the maximum number of blocks any single file can
allocate out of a cylinder group before it is forced to begin
allocating blocks from another cylinder group.
Typically this value is set to about one quarter of the total blocks
@ -92,7 +93,7 @@ in a cylinder group before seeking elsewhere.
For file systems with exclusively large files,
this parameter should be set higher.
.It Fl m Ar minfree
This value specifies the percentage of space held back
Specify the percentage of space held back
from normal users; the minimum free space threshold.
The default value used is 8%.
This value can be set to zero, however up to a factor of three
@ -103,6 +104,8 @@ writes.
Note that if the value is raised above the current usage level,
users will be unable to allocate files until enough files have
been deleted to get under the higher threshold.
.It Fl n Ar enable | disable
Turn on/off soft updates. An unmounted filesystem is required.
.It Fl o Ar optimize_preference
The file system can either try to minimize the time spent
allocating blocks, or it can attempt to minimize the space
@ -111,7 +114,7 @@ higher overhead for file writes.
The kernel normally changes the preference automatically as
the percent fragmentation changes on the file system.
.It Fl p
This option shows a summary of what the current tuneable settings
Show a summary of what the current tunable settings
are on the selected file system. More detailed information can be
obtained in the
.Xr dumpfs 8

23
sbin/tunefs/tunefs.c
View File

@ -32,13 +32,17 @@
*/
#ifndef lint
static char copyright[] =
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";
#endif
static const char rcsid[] =
"$Id$";
#endif /* not lint */
/*
@ -49,12 +53,11 @@ static char sccsid[] = "@(#)tunefs.c 8.2 (Berkeley) 4/19/94";
#include <ufs/ffs/fs.h>
#include <errno.h>
#include <err.h>
#include <fcntl.h>
#include <fstab.h>
#include <stdio.h>
#include <paths.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
@ -248,16 +251,10 @@ main(argc, argv)
void
usage()
{
fprintf(stderr, "usage: tunefs tuneup-options special-device\n");
fprintf(stderr, "where tuneup-options are:\n");
fprintf(stderr, "\t-a maximum contiguous blocks\n");
fprintf(stderr, "\t-d rotational delay between contiguous blocks\n");
fprintf(stderr, "\t-e maximum blocks per file in a cylinder group\n");
fprintf(stderr, "\t-m minimum percentage of free space\n");
fprintf(stderr, "\t-n soft updates (`enable' or `disable')\n");
fprintf(stderr, "\t-o optimization preference (`space' or `time')\n");
fprintf(stderr, "\t-p no change - just prints current tuneable settings\n");
fprintf(stderr, "%s\n%s\n%s\n",
"usage: tunefs [-A] [-a maxcontig] [-d rotdelay] [-e maxbpg] [-m minfree]",
" [-p] [-n enable | disable] [-o optimize_preference]",
" [special | filesystem]");
exit(2);
}