minix/commands/mount/mount.c

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/* 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>
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#include <fcntl.h>
#include <minix/config.h>
#include <minix/const.h>
#include <minix/minlib.h>
#include <sys/svrctl.h>
#include <stdio.h>
#include "mfs/const.h"
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#define MINIX_FS_TYPE "mfs"
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_PROTOTYPE(int main, (int argc, char **argv));
_PROTOTYPE(void list, (void));
_PROTOTYPE(void usage, (void));
int main(argc, argv)
int argc;
char *argv[];
{
int i, n, v = 0, mountflags, write_mtab;
char **ap, *vs, *opt, *err, *type, *args, *device;
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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;
write_mtab = 1;
type = NULL;
args = NULL;
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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 'n': write_mtab = 0; break;
case 'o': if (++i == argc) usage();
args = argv[i];
break;
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default: usage();
}
} else {
*ap++ = argv[i];
}
}
*ap = NULL;
argc = (ap - argv);
if (argc != 3 || *argv[1] == 0) usage();
device = argv[1];
if (!strcmp(device, "none")) device = NULL;
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if ((type == NULL || !strcmp(type, MINIX_FS_TYPE)) && device != NULL) {
/* auto-detect type and/or version */
v = fsversion(device, "mount");
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switch (v) {
case FSVERSION_MFS1:
case FSVERSION_MFS2:
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case FSVERSION_MFS3: type = MINIX_FS_TYPE; break;
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case FSVERSION_EXT2: type = "ext2"; break;
}
}
if (mount(device, argv[2], mountflags, type, args) < 0) {
err = strerror(errno);
fprintf(stderr, "mount: Can't mount %s on %s: %s\n",
argv[1], argv[2], err);
exit(1);
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}
/* The mount has completed successfully. Tell the user. */
printf("%s is read-%s mounted on %s\n",
argv[1], mountflags & MS_RDONLY ? "only" : "write", argv[2]);
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/* Update /etc/mtab. */
if (!write_mtab) return 0;
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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. */
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if (!strcmp(type, MINIX_FS_TYPE)) {
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switch (v) {
case FSVERSION_MFS1: vs = "1"; break;
case FSVERSION_MFS2: vs = "2"; break;
case FSVERSION_MFS3: vs = "3"; break;
default: vs = "0"; break;
}
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} else {
/* Keep the version field sufficiently short. */
if (strlen(type) < sizeof(version))
vs = type;
else
vs = "-";
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}
n = put_mtab_entry(argv[1], argv[2], vs,
(mountflags & MS_RDONLY ? "ro" : "rw") );
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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;
printf("%s is read-%s mounted on %s (type %s)\n",
special, strcmp(rw_flag, "rw") == 0 ? "write" : "only",
mounted_on, version);
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}
exit(0);
}
void usage()
{
std_err("Usage: mount [-r] [-t type] [-o options] special name\n");
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exit(1);
}