Date: Fri, 12 Mar 2004 12:47:19 +0200 From: Vasil Dimov <vd@datamax.bg> To: FreeBSD-gnats-submit@FreeBSD.org Subject: bin/64153: mdmfs features via fstab Message-ID: <1079088439.210030.12109.nullmailer@sinanica.lg2a.datamax> Resent-Message-ID: <200403121050.i2CAoIvg040578@freefall.freebsd.org>
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>Number: 64153
>Category: bin
>Synopsis: mdmfs features via fstab
>Confidential: no
>Severity: non-critical
>Priority: low
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: change-request
>Submitter-Id: current-users
>Arrival-Date: Fri Mar 12 02:50:18 PST 2004
>Closed-Date:
>Last-Modified:
>Originator: Vasil Dimov
>Release: FreeBSD 5.2.1-RELEASE-p1 i386
>Organization:
DataMax
>Environment:
System: FreeBSD sinanica.lg2a.datamax 5.2.1-RELEASE-p1 FreeBSD 5.2.1-RELEASE-p1 #5: Thu Mar 11 13:16:46 EET 2004 root@sinanica.lg2a.datamax:/usr/src/sys/i386/compile/SINANICA-SMP i386
>Description:
We don't have mount_XXX interface to mdmfs(8), so it's
features cannot be used in fstab.
>How-To-Repeat:
We want the following line in /etc/fstab to create a malloc disk of size 32m
and mount it to /mnt:
md /mnt mfs rw,-M,-s32m,-Otime,-p1777 1 0
but it calls mount_mfs which does not know about -M.
mount_FSTYPE is always searched and we can't call mdmfs.
>Fix:
some workaround can be to
ln -s /sbin/mdmfs /sbin/mount_foo
and use filesystem type foo in fstab.
But what a stupid link must be laying in /sbin/ and what a new filesystem
name to think of?
It would be better to make mount_mfs operate like mdmfs as they
are one program anyway.
mdmfs can be called with -C to operate like the old mount_mfs (compatible mode)
so I add -I (incompatible mode) to negate `-C' or `getprogname() = mount_mfs'
meaning. What we get is `mount_mfs -I' working like mdmfs. So in fstab:
md /mnt mfs rw,-I,-M,-s32m,-Otime,-p1777 1 0
The following is a simple "patch":
***** BEGIN mdmfs.c.-I.patch *****
--- mdmfs.c.orig Fri Mar 12 11:30:57 2004
+++ mdmfs.c Fri Mar 12 11:30:47 2004
@@ -118,7 +118,7 @@
compat = true;
while ((ch = getopt(argc, argv,
- "a:b:Cc:Dd:e:F:f:hi:LMm:Nn:O:o:p:Ss:t:Uv:w:X")) != -1)
+ "a:b:Cc:Dd:e:F:f:hIi:LMm:Nn:O:o:p:Ss:t:Uv:w:X")) != -1)
switch (ch) {
case 'a':
argappend(&newfs_arg, "-a %s", optarg);
@@ -157,6 +157,9 @@
break;
case 'h':
usage();
+ break;
+ case 'I':
+ compat = false;
break;
case 'i':
argappend(&newfs_arg, "-i %s", optarg);
***** END mdmfs.c.-I.patch *****
and the manual page of course:
***** BEGIN mdmfs.8.-I.patch *****
--- mdmfs.8.orig Fri Mar 12 12:06:26 2004
+++ mdmfs.8 Fri Mar 12 12:06:16 2004
@@ -160,6 +160,13 @@
.Ar file .
.It Fl f Ar frag-size
The fragment size of the file system in bytes.
+.It Fl I
+Incompatible (with mount_mfs(8)) mode. This is the default.
+It can be used to exert the
+.Nm
+power via mount_mfs command or to negate the
+.Fl C
+flag, should such a need occur.
.It Fl i Ar bytes
Number of bytes per inode.
.It Fl L
***** END mdmfs.8.-I.patch *****
Cheerz!
>Release-Note:
>Audit-Trail:
>Unformatted:
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