minix/commands/simple/mount.c

/* mount - mount a file system		Author: Andy Tanenbaum */

#include <errno.h>
#include <sys/types.h>
#include <limits.h>
#include <stdlib.h>
#include <dirent.h>
#include <string.h>
#include <sys/mount.h>
#include <unistd.h>
#include <fcntl.h>
#include <minix/config.h>
#include <minix/const.h>
#include <minix/minlib.h>
#include <sys/svrctl.h>
#include <stdio.h>
#include "../../servers/mfs/const.h"

#define MINIX_FS_TYPE "mfs"

_PROTOTYPE(int main, (int argc, char **argv));
_PROTOTYPE(void list, (void));
_PROTOTYPE(void usage, (void));
_PROTOTYPE(void tell, (char *this));

int main(argc, argv)
int argc;
char *argv[];
{
  int i, n, v, mountflags;
  char **ap, *vs, *opt, *err, *type, *args;
  char special[PATH_MAX+1], mounted_on[PATH_MAX+1], version[10], rw_flag[10];

  if (argc == 1) list();	/* just list /etc/mtab */
  mountflags = 0;
  type = NULL;
  args = NULL;
  ap = argv+1;
  for (i = 1; i < argc; i++) {
	if (argv[i][0] == '-') {
		opt = argv[i]+1;
		while (*opt != 0) switch (*opt++) {
		case 'r':	mountflags |= MS_RDONLY;	break;
		case 't':	if (++i == argc) usage();
				type = argv[i];
				break;
		case 'i':	mountflags |= MS_REUSE;		break;                
		case 'o':	if (++i == argc) usage();
				args = argv[i];
				break;
		default:	usage();
		}
	} else {
		*ap++ = argv[i];
	}
  }
  *ap = NULL;
  argc = (ap - argv);

  if (argc != 3) usage();
  if (mount(argv[1], argv[2], mountflags, type, args) < 0) {
	err = strerror(errno);
	std_err("mount: Can't mount ");
	std_err(argv[1]);
	std_err(" on ");
	std_err(argv[2]);
	std_err(": ");
	std_err(err);
	std_err("\n");
	exit(1);
  }
  /* The mount has completed successfully. Tell the user. */
  tell(argv[1]);
  tell(" is read-");
  tell(mountflags & MS_RDONLY ? "only" : "write");
  tell(" mounted on ");
  tell(argv[2]);
  tell("\n");

  /* Update /etc/mtab. */
  n = load_mtab("mount");
  if (n < 0) exit(1);		/* something is wrong. */

  /* Loop on all the /etc/mtab entries, copying each one to the output buf. */
  while (1) {
	n = get_mtab_entry(special, mounted_on, version, rw_flag);
	if (n < 0) break;
	n = put_mtab_entry(special, mounted_on, version, rw_flag);
	if (n < 0) {
		std_err("mount: /etc/mtab has grown too large\n");
		exit(1);
	}
  }
  /* For MFS, use a version number. Otherwise, use the FS type name. */
  if (type == NULL || !strcmp(type, MINIX_FS_TYPE)) {
	v = fsversion(argv[1], "mount");
	if (v == 1)
		vs = "1";
	else if (v == 2)
		vs = "2";
	else if (v == 3)
		vs = "3";
	else
		vs = "0";
  } else {
	/* Keep the version field sufficiently short. */
	if (strlen(type) < sizeof(version))
		vs = type;
	else
		vs = "-";
  }
  n = put_mtab_entry(argv[1], argv[2], vs,
		     (mountflags & MS_RDONLY ? "ro" : "rw") );
  if (n < 0) {
	std_err("mount: /etc/mtab has grown too large\n");
	exit(1);
  }

  n = rewrite_mtab("mount");
  return(0);
}


void list()
{
  int n;
  char special[PATH_MAX+1], mounted_on[PATH_MAX+1], version[10], rw_flag[10];

  /* Read and print /etc/mtab. */
  n = load_mtab("mount");
  if (n < 0) exit(1);

  while (1) {
	n = get_mtab_entry(special, mounted_on, version, rw_flag);
	if  (n < 0) break;
	write(1, special, strlen(special));
	tell(" is read-");
	tell(strcmp(rw_flag, "rw") == 0 ? "write" : "only");
	tell(" mounted on ");
	tell(mounted_on);
	tell("\n");
  }
  exit(0);
}


void usage()
{
  std_err("Usage: mount [-r] [-t type] [-o options] special name\n");
  exit(1);
}


void tell(this)
char *this;
{
  write(1, this, strlen(this));
}