minix/lib/other/_mount.c

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#include <lib.h>
#define mount _mount
#define umount _umount
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#include <string.h>
#include <sys/mount.h>
#include <stdlib.h>
#include <stdio.h>
#include <sys/stat.h>
#include <minix/syslib.h>
#include <minix/rs.h>
#include <minix/paths.h>
#define OK 0
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#define FSPATH "/sbin/"
#define FSDEFAULT "mfs"
PRIVATE int rs_down(char *label)
{
char cmd[200];
message m;
if(strlen(_PATH_SERVICE)+strlen(label)+50 >= sizeof(cmd))
return -1;
sprintf(cmd, _PATH_SERVICE " down '%s'", label);
return system(cmd);
}
PRIVATE char *makelabel(_CONST char *special)
{
static char label[40];
_CONST char *dev;
/* Make label name. */
dev = strrchr(special, '/');
if(dev) dev++;
else dev = special;
if(strchr(dev, '\'') != NULL) {
errno = EINVAL;
return NULL;
}
if(strlen(dev)+4 >= sizeof(label)) {
errno = E2BIG;
return NULL;
}
sprintf(label, "fs_%s", dev);
return label;
}
PUBLIC int mount(special, name, mountflags, type, args)
char *name, *special, *type, *args;
int mountflags;
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{
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int r;
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message m;
struct rs_start rs_start;
struct stat statbuf;
char *label;
char path[60];
char cmd[200];
FILE *pipe;
int ep;
int reuse;
/* Default values. */
if (type == NULL) type = FSDEFAULT;
if (args == NULL) args = "";
reuse = 0;
/* Check mount flags */
if(mountflags & MS_REUSE) {
reuse = 1;
mountflags &= ~MS_REUSE; /* Temporary: turn off to not confuse VFS */
}
/* Make FS process label for RS from special name. */
if(!(label=makelabel(special))) {
return -1;
}
/* See if the given type is even remotely valid. */
if(strlen(FSPATH)+strlen(type) >= sizeof(path)) {
errno = E2BIG;
return -1;
}
strcpy(path, FSPATH);
strcat(path, type);
if(stat(path, &statbuf) != 0) {
errno = EINVAL;
return -1;
}
/* Sanity check on user input. */
if(strchr(args, '\'')) {
errno = EINVAL;
return -1;
}
if(strlen(_PATH_SERVICE)+strlen(path)+strlen(label)+
strlen(_PATH_SYSTEM_CONF)+strlen(args)+50 >= sizeof(cmd)) {
errno = E2BIG;
return -1;
}
sprintf(cmd, _PATH_SERVICE " %sup %s -label '%s' -config " _PATH_SYSTEM_CONF
" -args '%s%s' -printep yes",
reuse ? "-r ": "", path, label, args[0] ? "-o " : "", args);
if(!(pipe = popen(cmd, "r"))) {
fprintf(stderr, "mount: couldn't run %s\n", cmd);
return -1;
}
if(fscanf(pipe, "%d", &ep) != 1 || ep <= 0) {
fprintf(stderr, "mount: couldn't parse endpoint from %s\n", cmd);
errno = EINVAL;
pclose(pipe);
return -1;
}
pclose(pipe);
/* Now perform mount(). */
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m.m1_i1 = strlen(special) + 1;
m.m1_i2 = strlen(name) + 1;
m.m1_i3 = mountflags;
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m.m1_p1 = special;
m.m1_p2 = name;
m.m1_p3 = (char*) ep;
r = _syscall(FS, MOUNT, &m);
if(r != OK) {
/* If mount() failed, tell RS to shutdown MFS process.
* No error check - won't do anything with this error anyway.
*/
rs_down(label);
}
return r;
}
PUBLIC int umount(name)
_CONST char *name;
{
message m;
char *label;
int r;
/* Make MFS process label for RS from special name. */
if(!(label=makelabel(name))) {
return -1;
}
_loadname(name, &m);
r = _syscall(FS, UMOUNT, &m);
if(r == OK) {
rs_down(label);
}
return r;
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}