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Introduce mdmfs(8), a wrapper around mdconfig(8), disklabel(8),

Browse Source 
newfs(8), and mount(8) that mimics the command line option set of the
deprecated mount_mfs(8).

Approved by:	jkh, phk, -hackers
This commit is contained in:
Dima Dorfman 2001-06-18 23:46:58 +00:00
parent fd3a67762c
commit 4d7de91f9e
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=78447
4 changed files with 930 additions and 0 deletions
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7
sbin/mdmfs/Makefile Normal file
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# $FreeBSD$
PROG= mdmfs
MAN= mdmfs.8
WARNS?= 2
.include <bsd.prog.mk>

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sbin/mdmfs/mdmfs.8 Normal file
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.\"
.\" Copyright (c) 2001 Dima Dorfman <dd@FreeBSD.org>
.\" 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.
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
.\"
.\" $FreeBSD$
.\"
.Dd May 26, 2001
.Dt MDMFS 8
.Os
.Sh NAME
.Nm mdmfs
.Nd configure and mount an in-memory filesystem using the
.Xr md 4
driver
.Sh SYNOPSIS
.Nm
.Op Fl DLMNSX
.Op Fl a Ar maxcontig
.Op Fl b Ar block-size
.Op Fl c Ar cylinders
.Op Fl d Ar rotdelay
.Op Fl e Ar maxbpg
.Op Fl F Ar file
.Op Fl f Ar frag-size
.Op Fl i Ar bytes
.Op Fl m Ar percent-free
.Op Fl n Ar rotational-positions
.Op Fl O Ar optimization
.Op Fl o Ar mount-options
.Op Fl p Ar permissions
.Op Fl s Ar size
.Op Fl w Ar user Ns | Ns Ar group
.Ar md-device
.Ar mount-point
.Sh DESCRIPTION
The
.Nm
program is designed to be a work-alike and look-alike of the deprecated
.Xr mount_mfs 8 .
The end result is essentially the same,
but is accomplished in a completely different way.
.Nm
configures an
.Xr md 4
disk using
.Xr mdconfig 8 ,
labels it using
.Xr disklabel 8 ,
puts a UFS filesystem on it using
.Xr newfs 8 ,
and mounts it using
.Xr mount 8 .
All the command line options are passed to the appropriate program
at the appropriate stage in order to achieve the desired effect.
.Pp
By default,
.Nm
creates a swap-based
.Pq Dv MD_SWAP
disk with soft-updates enabled
and mounts it on
.Ar mount-point .
It uses the
.Xr md 4
device specified by
.Ar md-device .
If
.Ar md-device
is
.Ql md
(no unit number),
it will use
.Xr md 4 Ns 's
auto-unit feature to automatically select an unused device.
Unless otherwise specified with one of the options below,
it uses the default arguments to all the helper programs.
.Pp
The following options are available.
Where possible,
the option letter matches the one used by
.Xr mount_mfs 8
for the same thing.
.Bl -tag -width Ds
.It Fl a Ar maxcontig
Specify the maximum number of contiguous blocks that will be laid
out before forcing a rotational delay
(see the
.Fl d
option).
.It Fl b Ar block-size
The block size of the filesystem, in bytes.
.It Fl c Ar cylinders
The number of cylinders per cylinder group in the filesystem.
.It Fl D
If not using auto-unit,
don't run
.Xr mdconfig 8
to try to detach the unit before attaching it.
.It Fl d Ar rotdelay
Specify the mininum time in milliseconds required to initiate another
disk transfer on the same cylinder.
Modern disks with read/write-behind achieve higher performance without
this feature,
so it is best to leave it at 0 milliseconds.
.It Fl e Ar maxbpg
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.
.It Fl F Ar file
Create a vnode-backed
.Pq Dv MD_VNODE
memory disk backed by
.Ar file .
.It Fl f Ar frag-size
The fragment size of the filesystem in bytes.
.It Fl i Ar bytes
Number of bytes per inode.
.It Fl L
Show the output of the helper programs.
By default,
it is sent to
.Pa /dev/null .
.It Fl M
Create a
.Xr malloc 9
backed disk
.Pq Dv MD_MALLOC
instead of a swap-backed disk.
.It Fl m Ar percent-free
The percentage of space reserved for the superuser.
.It Fl N
Don't actually run the helper programs.
This is most useful in conjunction with
.Fl X .
.It Fl n Ar rotational-positions
The default number of rotational positions to distinguish.
.It Fl O Ar optimization
Select the optimization preference;
valid choices are
.Ar space
and
.Ar time ,
which will optimize for minimum space fragmentation and
minimum time spent allocating blocks,
respectively.
.It Fl o Ar mount-options
Specify the mount options with which to mount the filesystem.
See
.Xr mount 8
for more information.
.It Fl p Ar permissions
Set the file (directory) permissions of the mount point
.Ar mount-point
to
.Ar permissions .
.It Fl S
Don't enable soft-updates on the filesystem.
.It Fl s Ar size
Specify the size of the disk to create.
This only makes sense if
.Fl F
is
.Em not
specified.
That is,
this will work for the default swap-backed
.Pq Dv MD_SWAP
disks,
and the optional
.Pq Fl M
.Xr malloc 9
backed disks
.Pq Dv MD_MALLOC .
.It Fl w Ar user Ns | Ns Ar group
Set the owner user and group to
.Ar user
and
.Ar group ,
respectively.
The arguments have the same semantics as with
.Xr chown 8 ,
but specifying just a user or just a group is not supported.
.El
.Pp
The
.Fl F
and
.Fl s
options are passed to
.Xr mdconfig 8
as
.Fl f
and
.Fl s ,
respectively.
The
.Fl a ,
.Fl b ,
.Fl c ,
.Fl d ,
.Fl e ,
.Fl f ,
.Fl i ,
.FL m
and
.Fl n
options are passed to
.Xr newfs 8
with the same letter;
the
.Fl O
option is passed to
.Xr newfs 8
as
.Fl o .
The
.Fl o
option is passed to
.Xr mount 8
with the same letter.
See the programs that the options are passed to for more information
on their semantics.
.Sh EXAMPLES
Create and mount a 32 megabyte swap-backed filesystem on
.Pa /tmp :
.Pp
.Dl mdmfs -s 32m md /tmp
.Pp
Create and mount a 16 megabyte malloc-backed filesystem on
.Pa /tmp
using the
.Pa /dev/md1
device;
furthermore,
don't use soft-updates it and mount it
.Cm async :
.Pp
.Dl mdmfs -M -S -o async -s 16m md1 /tmp
.Sh AUTHOR
.An Dima Dorfman
.Aq dd@FreeBSD.org

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sbin/mdmfs/mdmfs.c Normal file
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/*
* Copyright (c) 2001 Dima Dorfman <dd@FreeBSD.org>
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
*/
/*
* mdmfs (md/MFS) is a wrapper around mdconfig(8), disklabel(8),
* newfs(8), and mount(8) that mimics the command line option set of
* the deprecated mount_mfs(8).
*/
#ifndef lint
static const char rcsid[] =
"$FreeBSD$";
#endif /* not lint */
#include <sys/param.h>
#include <sys/mdioctl.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <assert.h>
#include <err.h>
#include <fcntl.h>
#include <grp.h>
#include <paths.h>
#include <pwd.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "pathnames.h"
typedef enum { false, true } bool;
struct mtpt_info {
uid_t mi_uid;
bool mi_have_uid;
gid_t mi_gid;
bool mi_have_gid;
mode_t mi_mode;
bool mi_have_mode;
};
static bool debug; /* Emit debugging information? */
static bool loudsubs; /* Suppress output from helper programs? */
static bool norun; /* Actually run the helper programs? */
static int unit; /* The unit we're working with. */
static const char *mdname; /* Name of memory disk device (e.g., "md"). */
static size_t mdnamelen; /* Length of mdname. */
static void argappend(char **, const char *, ...);
static void debugprintf(const char *, ...);
static void do_disklabel(void);
static void do_mdconfig_attach(const char *, const enum md_types);
static void do_mdconfig_attach_au(const char *, const enum md_types);
static void do_mdconfig_detach(void);
static void do_mount(const char *, const char *);
static void do_mtptsetup(const char *, struct mtpt_info *);
static void do_newfs(const char *);
static void extract_ugid(const char *, struct mtpt_info *);
static int run(int *, const char *, ...);
static void usage(void);
int
main(int ac, char **av)
{
struct mtpt_info mi; /* Mountpoint info. */
char *mdconfig_arg, *newfs_arg, /* Args to helper programs. */
*mount_arg;
enum md_types mdtype; /* The type of our memory disk. */
bool have_mdtype;
bool detach, softdep, autounit;
char *mtpoint, *unitstr;
char ch, *p;
/* Misc. initialization. */
(void)memset(&mi, '\0', sizeof(mi));
detach = true;
softdep = true;
autounit = false;
have_mdtype = false;
mdname = MD_NAME;
mdnamelen = strlen(mdname);
/*
* Can't set these to NULL. They may be passed to the
* respective programs without modification. I.e., we may not
* receive any command-line options which will caused them to
* be modified.
*/
mdconfig_arg = strdup("");
newfs_arg = strdup("");
mount_arg = strdup("");
while ((ch = getopt(ac, av,
"a:b:c:Dd:e:F:f:hi:LMm:Nn:O:o:p:Ss:t:w:X")) != -1)
switch (ch) {
case 'a':
argappend(&newfs_arg, "-a %s", optarg);
break;
case 'b':
argappend(&newfs_arg, "-b %s", optarg);
break;
case 'c':
argappend(&newfs_arg, "-c %s", optarg);
break;
case 'D':
detach = false;
break;
case 'd':
argappend(&newfs_arg, "-d %s", optarg);
break;
case 'e':
argappend(&newfs_arg, "-e %s", optarg);
break;
case 'F':
if (have_mdtype)
usage();
mdtype = MD_VNODE;
have_mdtype = true;
argappend(&mdconfig_arg, "-f %s", optarg);
break;
case 'f':
argappend(&newfs_arg, "-f %s", optarg);
break;
case 'h':
usage();
break;
case 'i':
argappend(&newfs_arg, "-i %s", optarg);
break;
case 'L':
loudsubs = true;
break;
case 'M':
if (have_mdtype)
usage();
mdtype = MD_MALLOC;
have_mdtype = true;
break;
case 'm':
argappend(&newfs_arg, "-m %s", optarg);
break;
case 'N':
norun = true;
break;
case 'n':
argappend(&newfs_arg, "-n %s", optarg);
break;
case 'O':
argappend(&newfs_arg, "-o %s", optarg);
break;
case 'o':
argappend(&mount_arg, "-o %s", optarg);
break;
case 'p':
if (*optarg >= '0' && *optarg <= '7')
mi.mi_mode = strtol(optarg, NULL, 8);
if ((mi.mi_mode & ~07777) != 0)
usage();
mi.mi_have_mode = true;
break;
case 'S':
softdep = false;
break;
case 's':
argappend(&mdconfig_arg, "-s %s", optarg);
break;
case 'w':
extract_ugid(optarg, &mi);
break;
case 'X':
debug = true;
break;
default:
usage();
}
ac -= optind;
av += optind;
if (ac < 2)
usage();
/* Derive 'unit' (global). */
unitstr = av[0];
if (strncmp(unitstr, "/dev/", 5) == 0)
unitstr += 5;
if (strncmp(unitstr, mdname, mdnamelen) == 0)
unitstr += mdnamelen;
if (*unitstr == '\0') {
autounit = true;
unit = -1;
} else {
unit = strtoul(unitstr, &p, 10);
if ((unsigned)unit == ULONG_MAX || *p != '\0')
errx(1, "bad device unit: %s", unitstr);
}
mtpoint = av[1];
if (!have_mdtype)
mdtype = MD_SWAP;
if (softdep)
argappend(&newfs_arg, "-U");
/* Do the work. */
if (detach && !autounit)
do_mdconfig_detach();
if (autounit)
do_mdconfig_attach_au(mdconfig_arg, mdtype);
else
do_mdconfig_attach(mdconfig_arg, mdtype);
do_disklabel();
do_newfs(newfs_arg);
do_mount(mount_arg, mtpoint);
do_mtptsetup(mtpoint, &mi);
return (0);
}
/*
* Append the expansion of 'fmt' to the buffer pointed to by '*dstp';
* reallocate as required.
*/
static void
argappend(char **dstp, const char *fmt, ...)
{
char *old, *new;
va_list ap;
old = *dstp;
assert(old != NULL);
va_start(ap, fmt);
if (vasprintf(&new, fmt,ap) == -1)
errx(1, "vasprintf");
va_end(ap);
*dstp = new;
if (asprintf(&new, "%s %s", old, new) == -1)
errx(1, "asprintf");
free(*dstp);
free(old);
*dstp = new;
}
/*
* If run-time debugging is enabled, print the expansion of 'fmt'.
* Otherwise, do nothing.
*/
static void
debugprintf(const char *fmt, ...)
{
va_list ap;
if (!debug)
return;
fprintf(stderr, "DEBUG: ");
va_start(ap, fmt);
vfprintf(stderr, fmt, ap);
va_end(ap);
fprintf(stderr, "\n");
fflush(stderr);
}
/*
* Label the memory disk.
*/
static void
do_disklabel(void)
{
int rv;
rv = run(NULL, "%s -r -w %s%d auto", PATH_DISKLABEL, mdname, unit);
if (rv)
errx(1, "disklabel exited with error code %d", rv);
}
/*
* Attach a memory disk with a known unit.
*/
static void
do_mdconfig_attach(const char *args, const enum md_types mdtype)
{
int rv;
const char *ta; /* Type arg. */
switch (mdtype) {
case MD_SWAP:
ta = "-t swap";
break;
case MD_VNODE:
ta = "-t vnode";
break;
case MD_MALLOC:
ta = "-t malloc";
break;
default:
abort();
}
rv = run(NULL, "%s -a %s%s -u %s%d", PATH_MDCONFIG, ta, args,
mdname, unit);
if (rv)
errx(1, "mdconfig (attach) exited with error code %d", rv);
}
/*
* Attach a memory disk with an unknown unit; use autounit.
*/
static void
do_mdconfig_attach_au(const char *args, const enum md_types mdtype)
{
const char *ta; /* Type arg. */
char *linep, *linebuf; /* Line pointer, line buffer. */
int fd; /* Standard output of mdconfig invocation. */
FILE *sfd;
int rv;
char *p;
size_t linelen;
switch (mdtype) {
case MD_SWAP:
ta = "-t swap";
break;
case MD_VNODE:
ta = "-t vnode";
break;
case MD_MALLOC:
ta = "-t malloc";
break;
default:
abort();
}
rv = run(&fd, "%s -a %s%s", PATH_MDCONFIG, ta, args);
if (rv)
errx(1, "mdconfig (attach) exited with error code %d", rv);
/* Receive the unit number. */
if (norun) { /* Since we didn't run, we can't read. Fake it. */
unit = -1;
return;
}
sfd = fdopen(fd, "r");
if (sfd == NULL)
err(1, "fdopen");
linep = fgetln(sfd, &linelen);
if (linep == NULL && linelen < mdnamelen + 1)
errx(1, "unexpected output from mdconfig (attach)");
/* If the output format changes, we want to know about it. */
assert(strncmp(linep, mdname, mdnamelen) == 0);
linebuf = malloc(linelen - mdnamelen + 1);
assert(linebuf != NULL);
/* Can't use strlcpy because linep is not NULL-terminated. */
strncpy(linebuf, linep + mdnamelen, linelen);
linebuf[linelen] = '\0';
unit = strtoul(linebuf, &p, 10);
if ((unsigned)unit == ULONG_MAX || *p != '\n')
errx(1, "unexpected output from mdconfig (attach)");
fclose(sfd);
close(fd);
}
/*
* Detach a memory disk.
*/
static void
do_mdconfig_detach(void)
{
int rv;
rv = run(NULL, "%s -d -u %s%d", PATH_MDCONFIG, mdname, unit);
if (rv && debug) /* This is allowed to fail. */
warnx("mdconfig (detach) exited with error code %d (ignored)",
rv);
}
/*
* Mount the configured memory disk.
*/
static void
do_mount(const char *args, const char *mtpoint)
{
int rv;
rv = run(NULL, "%s%s /dev/%s%dc %s", PATH_MOUNT, args,
mdname, unit, mtpoint);
if (rv)
errx(1, "mount exited with error code %d", rv);
}
/*
* Various configuration of the mountpoint. Mostly, enact 'mip'.
*/
static void
do_mtptsetup(const char *mtpoint, struct mtpt_info *mip)
{
if (mip->mi_have_mode) {
debugprintf("changing mode of %s to %o.", mtpoint,
mip->mi_mode);
if (!norun)
if (chmod(mtpoint, mip->mi_mode) == -1)
err(1, "chmod: %s", mtpoint);
}
/*
* We have to do these separately because the user may have
* only specified one of them.
*/
if (mip->mi_have_uid) {
debugprintf("changing owner (user) or %s to %u.", mtpoint,
mip->mi_uid);
if (!norun)
if (chown(mtpoint, mip->mi_uid, -1) == -1)
err(1, "chown %s to %u (user)", mtpoint,
mip->mi_uid);
}
if (mip->mi_have_gid) {
debugprintf("changing owner (group) or %s to %u.", mtpoint,
mip->mi_gid);
if (!norun)
if (chown(mtpoint, -1, mip->mi_gid) == -1)
err(1, "chown %s to %u (group)", mtpoint,
mip->mi_gid);
}
}
/*
* Put a filesystem on the memory disk.
*/
static void
do_newfs(const char *args)
{
int rv;
rv = run(NULL, "%s%s /dev/%s%dc", PATH_NEWFS, args, mdname, unit);
if (rv)
errx(1, "newfs exited with error code %d", rv);
}
/*
* 'str' should be a user and group name similar to the last argument
* to chown(1); i.e., a user, followed by a colon, followed by a
* group. The user and group in 'str' may be either a [ug]id or a
* name. Upon return, the uid and gid fields in 'mip' will contain
* the uid and gid of the user and group name in 'str', respectively.
*
* In other words, this derives a user and group id from a string
* formatted like the last argument to chown(1).
*/
static void
extract_ugid(const char *str, struct mtpt_info *mip)
{
char *ug; /* Writable 'str'. */
char *user, *group; /* Result of extracton. */
size_t strl; /* Length of 'str' incl. NULL. */
struct passwd *pw;
struct group *gr;
char *p;
uid_t *uid;
gid_t *gid;
size_t rv;
uid = &mip->mi_uid;
gid = &mip->mi_gid;
mip->mi_have_uid = mip->mi_have_gid = false;
/* Extract the user and group from 'str'. Format above. */
strl = strlen(str) + 1;
ug = malloc(strl);
assert(ug != NULL);
rv = strlcpy(ug, str, strl);
if (rv >= strl)
errx(1, "-w word too long (%d >= %d)", rv, strl);
group = ug;
user = strsep(&group, ":");
if (user == NULL || group == NULL || *user == '\0' || *group == '\0')
usage();
/* Derive uid. */
*uid = strtoul(user, &p, 10);
if ((unsigned)*uid == ULONG_MAX)
usage();
if (*p != '\0') {
pw = getpwnam(user);
if (pw == NULL)
errx(1, "invalid user: %s", user);
*uid = pw->pw_uid;
mip->mi_have_uid = true;
}
/* Derive gid. */
*gid = strtoul(group, &p, 10);
if ((unsigned)*gid == ULONG_MAX)
usage();
if (*p != '\0') {
gr = getgrnam(group);
if (gr == NULL)
errx(1, "invalid group: %s", group);
*gid = gr->gr_gid;
mip->mi_have_gid = true;
}
free(ug);
/*
* At this point we don't support only a username or only a
* group name. do_mtptsetup already does, so when this
* feature is desired, this is the only routine that needs to
* be changed.
*/
assert(mip->mi_have_uid);
assert(mip->mi_have_gid);
}
/*
* Run a process with command name and arguments pointed to by the
* formatted string 'cmdline'. Since system(3) is not used, the first
* space-delimited token of 'cmdline' must be the full pathname of the
* program to run. The return value is the return code of the process
* spawned. If 'ofd' is non-NULL, it is set to the standard output of
* the program spawned (i.e., you can read from ofd and get the output
* of the program).
*/
static int
run(int *ofd, const char *cmdline, ...)
{
char **av, **avp; /* Result of splitting 'cmd'. */
int ac;
char *cmd; /* Expansion of 'cmdline'. */
int pid, status; /* Child info. */
int pfd[2]; /* Pipe to the child. */
int nfd; /* Null (/dev/null) file descriptor. */
bool dup2dn; /* Dup /dev/null to stdout? */
va_list ap;
char *p;
int rv, i;
dup2dn = true;
va_start(ap, cmdline);
rv = vasprintf(&cmd, cmdline, ap);
if (rv == -1)
err(1, "vasprintf");
va_end(ap);
/* Split up 'cmd' into 'av' for use with execve. */
for (ac = 1, p = cmd; (p = strchr(p, ' ')) != NULL; p++)
ac++; /* 'ac' generation loop. */
av = (char **)malloc(sizeof(*av) * (ac + 1));
assert(av != NULL);
for (p = cmd, avp = av; (*avp = strsep(&p, " ")) != NULL;)
if (**av != '\0')
if (++avp >= &av[ac]) {
*avp = NULL;
break;
}
assert(*av);
/* Make sure the above loop works as expected. */
if (debug) {
/*
* We can't, but should, use debugprintf here. First,
* it appends a trailing newline to the output, and
* second it prepends "DEBUG: " to the output. The
* former is a problem for this would-be first call,
* and the latter for the would-be call inside the
* loop.
*/
(void)fprintf(stderr, "DEBUG: running:");
/* Should be equivilent to 'cmd' (before strsep, of course). */
for (i = 0; av[i] != NULL; i++)
(void)fprintf(stderr, " %s", av[i]);
(void)fprintf(stderr, "\n");
}
/* Create a pipe if necessary and fork the helper program. */
if (ofd != NULL) {
if (pipe(&pfd[0]) == -1)
err(1, "pipe");
*ofd = pfd[0];
dup2dn = false;
}
pid = fork();
switch (pid) {
case 0:
/* XXX can we call err() in here? */
if (norun)
_exit(0);
if (ofd != NULL)
if (dup2(pfd[1], STDOUT_FILENO) < 0)
err(1, "dup2");
if (!loudsubs) {
nfd = open(_PATH_DEVNULL, O_RDWR);
if (nfd == -1)
err(1, "open: %s", _PATH_DEVNULL);
if (dup2(nfd, STDIN_FILENO) < 0)
err(1, "dup2");
if (dup2dn)
if (dup2(nfd, STDOUT_FILENO) < 0)
err(1, "dup2");
if (dup2(nfd, STDERR_FILENO) < 0)
err(1, "dup2");
}
(void)execv(av[0], av);
warn("exec: %s", av[0]);
_exit(-1);
case -1:
err(1, "fork");
}
free(cmd);
free(av);
while (waitpid(pid, &status, 0) != pid)
;
return (WEXITSTATUS(status));
}
static void
usage(void)
{
fprintf(stderr,
"usage: %s [-DLMNSX] [-a maxcontig] [-b block-size] [-c cylinders]\n"
"\t[-d rotdelay] [-e maxbpg] [-F file] [-f frag-size] [-i bytes]\n"
"\t[-m percent-free] [-n rotational-positions] [-O optimization]\n"
"\t[-o mount-options] [-p permissions] [-s size] [-w user:group]\n"
"\tmd-device mount-point\n", getprogname());
exit(1);
}

10
sbin/mdmfs/pathnames.h Normal file
View File

@ -0,0 +1,10 @@
/* $FreeBSD$ */
#ifndef MDMFS_PATHNAMES_H
#define MDMFS_PATHNAMES_H
#define PATH_MDCONFIG "/sbin/mdconfig"
#define PATH_DISKLABEL "/sbin/disklabel"
#define PATH_NEWFS "/sbin/newfs"
#define PATH_MOUNT "/sbin/mount"
#endif /* !MDMFS_PATHNAMES_H */