minix/lib/libc/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];
if(strlen(_PATH_SERVICE)+strlen(label)+50 >= sizeof(cmd))
return -1;
sprintf(cmd, _PATH_SERVICE " down '%s'", label);
return system(cmd);
}
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 stat statbuf;
char label[16];
char path[60];
char cmd[200];
char *p;
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 a label for the file system process. This label must be unique and
* may currently not exceed 16 characters including terminating null. For
* requests with an associated block device, we use the last path component
* name of the block special file (truncated to 12 characters, which is
* hopefully enough). For requests with no associated block device, we use
* the device number and inode of the mount point, in hexadecimal form.
*/
if (special) {
p = strrchr(special, '/');
p = p ? p + 1 : special;
if (strchr(p, '\'')) {
errno = EINVAL;
return -1;
}
sprintf(label, "fs_%.12s", p);
} else {
if (stat(name, &statbuf) < 0) return -1;
sprintf(label, "fs_%04x%lx", statbuf.st_dev, statbuf.st_ino);
}
/* Tell VFS that we are passing in a 16-byte label. */
mountflags |= MS_LABEL16;
/* 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(args)+50 >= sizeof(cmd)) {
errno = E2BIG;
return -1;
}
sprintf(cmd, _PATH_SERVICE " %sup %s -label '%s' -args '%s%s'",
reuse ? "-r ": "", path, label, args[0] ? "-o " : "", args);
if((r = system(cmd)) != 0) {
fprintf(stderr, "mount: couldn't run %s\n", cmd);
errno = r;
return -1;
}
/* Now perform mount(). */
m.m1_i1 = special ? strlen(special) + 1 : 0;
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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 = label;
r = _syscall(VFS_PROC_NR, 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;
int r;
_loadname(name, &m);
r = _syscall(VFS_PROC_NR, UMOUNT, &m);
if(r == OK) {
/* VFS returns the label of the unmounted file system in the reply.
* As of writing, the size of the m3_ca1 field is 16 bytes.
*/
rs_down(m.m3_ca1);
}
return r;
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}