minix/lib/nbsd_libc/sys-minix/mount.c
Gianluca Guida 4f294c247f Add NBSDLibc Minix specific files.
This patch mainly copies and modifies files existing in
the current libc implementing minix specific functions.

To keep consisten with the NetBSD libc, we remove 
namespace stubs and we use "namespace.h" and weak
links.
2011-02-17 17:11:09 +00:00

180 lines
3.9 KiB
C

#include <sys/cdefs.h>
#include "namespace.h"
#include <lib.h>
#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 <paths.h>
#define OK 0
#ifdef __weak_alias
__weak_alias(mount, _mount)
__weak_alias(umount, _umount)
__weak_alias(umount2, _umount2)
#endif
#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;
{
int r;
message m;
struct stat statbuf;
char label[16];
char path[60];
char cmd[200];
char *p;
int reuse = 0;
int use_existing = 0;
/* 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 */
}
if(mountflags & MS_EXISTING) {
use_existing = 1;
mountflags &= ~MS_EXISTING; /* 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 (!use_existing) {
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%x", statbuf.st_dev, statbuf.st_ino);
}
} else {
/* label to long? */
if (strlen(type) < 16) {
sprintf(label, "%s", type);
} else {
errno = ENOMEM;
return -1;
}
}
/* 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;
}
/* start the fs-server if not using existing one */
if (!use_existing) {
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;
m.m1_i2 = strlen(name) + 1;
m.m1_i3 = mountflags;
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;
{
return umount2(name, 0);
}
PUBLIC int umount2(name, flags)
_CONST char *name;
int flags;
{
message m;
int r;
_loadname(name, &m);
r = _syscall(VFS_PROC_NR, UMOUNT, &m);
/* don't shut down the driver when exist flag is set */
if (!(flags & MS_EXISTING)) {
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;
}