Date: Sun, 25 Jun 1995 07:50:03 -0700 From: peter@haywire.dialix.com To: freebsd-bugs Subject: bin/561: missing functionality in tunefs Message-ID: <199506251450.HAA22785@freefall.cdrom.com> In-Reply-To: Your message of Sun, 25 Jun 1995 22:48:05 %2B0800 <199506251448.WAA00424@jhome.DIALix.COM>
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>Number: 561
>Category: bin
>Synopsis: missing functionality in tunefs
>Confidential: no
>Severity: non-critical
>Priority: low
>Responsible: freebsd-bugs (FreeBSD bugs mailing list)
>State: open
>Class: change-request
>Submitter-Id: current-users
>Arrival-Date: Sun Jun 25 07:50:02 1995
>Originator: Peter Wemm
>Organization:
DIALix Services
>Release: FreeBSD 2.0-BUILT-19950510 i386
>Environment:
FreeBSD-current
FreeBSD jhome.DIALix.COM 2.0-BUILT-19950625 FreeBSD 2.0-BUILT-19950625 #4: Sun Jun 25 22:05:25 WST 1995 pwroot@jhome.DIALix.COM:/usr/src/sys/compile/JHOME i386
>Description:
When tuneing filesystems with tunefs, it is not obvious what the current
parameters are. You can use dumpfs, but that's not obvious which settings
are tuneable, and is far from clear to the non-guru (it's like using a
hexdump of a tar archive to get a table-of-contents).
There is also an undocumented option in the man page that can be dangerous.
Suppose your disk driver decides to scramble all writes while you tell
tunefs to update all backup superblocks.
This suggested change adds a '-p' (print) switch to bring it in
line with some SVR4 systems.
# tunefs -p /dev/rsd0h
tunefs: maximum contiguous block count: (-a) 1
tunefs: rotational delay between contiguous blocks: (-d) 4 ms
tunefs: maximum blocks per file in a cylinder group: (-e) 1024
tunefs: minimum percentage of free space: (-m) 10%
tunefs: optimization preference: (-o) time
>How-To-Repeat:
Use tunefs and dumpfs.
>Fix:
Apply this patch to tunefs.c and tunefs.8
*** tunefs.old.c Tue May 30 18:47:45 1995
--- tunefs.c Sun Jun 25 22:38:57 1995
***************
*** 117,122 ****
--- 117,137 ----
Aflag++;
continue;
+ case 'p':
+ 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("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);
+
+ continue;
+
case 'a':
name = "maximum contiguous block count";
if (argc < 1)
***************
*** 233,238 ****
--- 248,254 ----
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-o optimization preference (`space' or `time')\n");
+ fprintf(stderr, "\t-p no change - just prints current tuneable settings\n");
exit(2);
}
*** tunefs.old.8 Wed Mar 15 17:10:47 1995
--- tunefs.8 Mon May 29 10:06:18 1995
***************
*** 39,48 ****
--- 39,50 ----
.Nd tune up an existing file system
.Sh SYNOPSIS
.Nm tunefs
+ .Op Fl A
.Op Fl a Ar maxcontig
.Op Fl d Ar rotdelay
.Op Fl e Ar maxbpg
.Op Fl m Ar minfree
+ .Op Fl p
.Bk -words
.Op Fl o Ar optimize_preference
.Ek
***************
*** 54,59 ****
--- 56,65 ----
The parameters which are to be changed are indicated by the flags
given below:
.Bl -tag -width Ds
+ .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
be laid out before forcing a rotational delay (see
***************
*** 103,108 ****
--- 109,120 ----
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
+ are on the selected file system. More detailed information can be
+ obtained in the
+ .Xr dumpfs 8
+ manual page.
.El
.Sh SEE ALSO
.Xr fs 5 ,
>Audit-Trail:
>Unformatted:
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