minix/commands/simple/mount.c

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2005-04-21 16:53:53 +02:00
/* 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 <unistd.h>
#include <fcntl.h>
#include <minix/config.h>
#include <minix/const.h>
#include <minix/minlib.h>
#include <minix/swap.h>
#include <sys/svrctl.h>
#include <stdio.h>
#include "../../servers/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));
_PROTOTYPE(void tell, (char *this));
_PROTOTYPE(void swapon, (char *file));
static u8_t MAGIC[] = { SWAP_MAGIC0, SWAP_MAGIC1, SWAP_MAGIC2, SWAP_MAGIC3 };
int main(argc, argv)
int argc;
char *argv[];
{
int i, ro, swap, n, v;
char **ap, *vs, *opt, *err, *type, *args;
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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 */
ro = 0;
swap = 0;
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': ro = 1; break;
case 's': swap = 1; break;
case 't': if (++i == argc) usage();
type = argv[i];
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 (ro && swap) usage();
if (swap) {
if (argc != 2) usage();
swapon(argv[1]);
tell(argv[1]);
tell(" is swapspace\n");
} else {
if (argc != 3) usage();
if (mount(argv[1], argv[2], ro, type, args) < 0) {
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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(ro ? "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);
}
}
if (swap) {
vs = "swap";
} else {
/* 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 = "-";
}
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}
n = put_mtab_entry(argv[1], swap ? "swap" : argv[2], vs, (ro ? "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));
if (strcmp(version, "swap") == 0) {
tell(" is swapspace\n");
} else {
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"
" mount -s special\n");
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exit(1);
}
void tell(this)
char *this;
{
write(1, this, strlen(this));
}
void swapon(file)
char *file;
{
u32_t super[2][_MAX_BLOCK_SIZE / 2 / sizeof(u32_t)];
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swap_hdr_t *sp;
struct mmswapon mmswapon;
int fd, r;
char *err;
if ((fd = open(file, O_RDWR)) < 0
|| lseek(fd, SUPER_BLOCK_BYTES, SEEK_SET) == -1
|| (r = read(fd, super, _STATIC_BLOCK_SIZE)) < 0
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) {
err = strerror(errno);
std_err("mount: ");
std_err(file);
std_err(": ");
std_err(err);
std_err("\n");
exit(1);
}
sp = (swap_hdr_t *) &super[0];
if (memcmp(sp->sh_magic, MAGIC, sizeof(MAGIC)) != 0)
sp = (swap_hdr_t *) &super[1];
if (r == _STATIC_BLOCK_SIZE && memcmp(sp->sh_magic, MAGIC, sizeof(MAGIC)) != 0
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|| sp->sh_version > SH_VERSION) {
std_err("mount: ");
std_err(file);
std_err(" is not swapspace\n");
exit(1);
}
close(fd);
mmswapon.offset = sp->sh_offset;
mmswapon.size = sp->sh_swapsize;
strncpy(mmswapon.file, file, sizeof(mmswapon.file));
mmswapon.file[sizeof(mmswapon.file)-1] = 0;
if (svrctl(MMSWAPON, &mmswapon) < 0) {
err = strerror(errno);
std_err("mount: ");
std_err(file);
std_err(": ");
std_err(err);
std_err("\n");
exit(1);
}
}