* 1999-04-17 Dave Cinege...Rewrote -t auto. Fixed ro mtab.
*
* 1999-10-07 Erik Andersen <andersen@lineo.com>, <andersee@debian.org>.
- * Rewrote of a lot of code. Removed mtab usage (I plan on
+ * Rewrite of a lot of code. Removed mtab usage (I plan on
* putting it back as a compile-time option some time),
* major adjustments to option parsing, and some serious
* dieting all around.
-*/
+ *
+ * 1999-11-06 mtab suppport is back - andersee
+ *
+ * 2000-01-12 Ben Collins <bcollins@debian.org>, Borrowed utils-linux's
+ * mount to add loop support.
+ */
#include "internal.h"
#include <stdlib.h>
#include <ctype.h>
#include <fstab.h>
-static const char mount_usage[] = "Usage:\tmount [flags]\n"
+#if defined BB_FEATURE_MOUNT_LOOP
+#include <fcntl.h>
+#include <sys/ioctl.h>
+#include <linux/loop.h>
+
+static int set_loop(const char *device, const char *file, int offset, int *loopro);
+static char *find_unused_loop_device (void);
+
+static int use_loop = 0;
+#endif
+
+extern const char mtab_file[]; /* Defined in utility.c */
+
+static const char mount_usage[] = "\tmount [flags]\n"
"\tmount [flags] device directory [-o options,more-options]\n"
"\n"
"Flags:\n"
"\t-a:\tMount all file systems in fstab.\n"
+#ifdef BB_MTAB
+ "\t-f:\t\"Fake\" mount. Add entry to mount table but don't mount it.\n"
+ "\t-n:\tDon't write a mount table entry.\n"
+#endif
"\t-o option:\tOne of many filesystem options, listed below.\n"
"\t-r:\tMount the filesystem read-only.\n"
"\t-t filesystem-type:\tSpecify the filesystem type.\n"
"\tasync / sync:\tWrites are asynchronous / synchronous.\n"
"\tdev / nodev:\tAllow use of special device files / disallow them.\n"
"\texec / noexec:\tAllow use of executable files / disallow them.\n"
+#if defined BB_FEATURE_MOUNT_LOOP
+ "\tloop: Mounts a file via loop device.\n"
+#endif
"\tsuid / nosuid:\tAllow set-user-id-root programs / disallow them.\n"
"\tremount: Re-mount a currently-mounted filesystem, changing its flags.\n"
"\tro / rw: Mount for read-only / read-write.\n"
"There are EVEN MORE flags that are specific to each filesystem.\n"
"You'll have to see the written documentation for those.\n";
+
struct mount_options {
const char *name;
unsigned long and;
{0, 0, 0}
};
+static int
+do_mount(char* specialfile, char* dir, char* filesystemtype,
+ long flags, void* string_flags, int useMtab, int fakeIt, char* mtab_opts)
+{
+ int status=0;
+
+#if defined BB_MTAB
+ if (fakeIt==FALSE)
+#endif
+ {
+#if defined BB_FEATURE_MOUNT_LOOP
+ if (use_loop) {
+ int loro = flags & MS_RDONLY;
+ char *lofile = specialfile;
+ specialfile = find_unused_loop_device();
+ if (specialfile == NULL) {
+ fprintf(stderr, "Could not find a spare loop device\n");
+ exit(1);
+ }
+ if (set_loop (specialfile, lofile, 0, &loro)) {
+ fprintf(stderr, "Could not setup loop device\n");
+ exit(1);
+ }
+ if (!(flags & MS_RDONLY) && loro) { /* loop is ro, but wanted rw */
+ fprintf(stderr, "WARNING: loop device is read-only\n");
+ flags &= ~MS_RDONLY;
+ }
+ }
+#endif
+ status=mount(specialfile, dir, filesystemtype, flags, string_flags);
+ }
+#if defined BB_MTAB
+ if (status == 0) {
+ if (useMtab==TRUE)
+ write_mtab(specialfile, dir, filesystemtype, flags, mtab_opts);
+ return 0;
+ }
+ else
+#endif
+ return(status);
+}
+
+
+
+#if defined BB_MTAB
+#define whine_if_fstab_is_missing() {}
+#else
+extern void whine_if_fstab_is_missing()
+{
+ struct stat statBuf;
+ if (stat("/etc/fstab", &statBuf) < 0)
+ fprintf(stderr, "/etc/fstab file missing -- install one to name /dev/root.\n\n");
+}
+#endif
+
/* Seperate standard mount options from the nonstandard string options */
static void
}
f++;
}
+#if defined BB_FEATURE_MOUNT_LOOP
+ if (gotone==FALSE && !strcasecmp ("loop", options)) { /* loop device support */
+ use_loop = 1;
+ gotone=TRUE;
+ }
+#endif
if (*strflags && strflags!= '\0' && gotone==FALSE) {
char *temp=strflags;
temp += strlen (strflags);
*temp++ = ',';
*temp++ = '\0';
}
- if (gotone==FALSE) {
+ if (gotone==FALSE)
strcat (strflags, options);
- gotone=FALSE;
- }
if (comma) {
*comma = ',';
options = ++comma;
}
int
-mount_one (
- char *blockDevice, char *directory, char *filesystemType,
- unsigned long flags, char *string_flags)
+mount_one(char *blockDevice, char *directory, char *filesystemType,
+ unsigned long flags, char *string_flags, int useMtab, int fakeIt, char *mtab_opts)
{
int status = 0;
char buf[255];
+#if defined BB_FEATURE_USE_PROCFS
if (strcmp(filesystemType, "auto") == 0) {
FILE *f = fopen ("/proc/filesystems", "r");
filesystemType = buf;
filesystemType++; // hop past tab
- status = mount (blockDevice, directory, filesystemType,
- flags | MS_MGC_VAL, string_flags);
+ status = do_mount (blockDevice, directory, filesystemType,
+ flags | MS_MGC_VAL, string_flags, useMtab,
+ fakeIt, mtab_opts);
if (status == 0)
break;
}
}
fclose (f);
- } else {
- status = mount (blockDevice, directory, filesystemType,
- flags | MS_MGC_VAL, string_flags);
+ } else
+#endif
+ {
+ status = do_mount (blockDevice, directory, filesystemType,
+ flags | MS_MGC_VAL, string_flags, useMtab,
+ fakeIt, mtab_opts);
}
if (status) {
extern int mount_main (int argc, char **argv)
{
- char string_flags[1024]="";
+ char string_flags_buf[1024]="";
+ char *string_flags = string_flags_buf;
+ char *extra_opts = string_flags_buf;
unsigned long flags = 0;
char *filesystemType = "auto";
char *device = NULL;
char *directory = NULL;
- struct stat statBuf;
- int all = 0;
+ int all = FALSE;
+ int fakeIt = FALSE;
+ int useMtab = TRUE;
int i;
- if (stat("/etc/fstab", &statBuf) < 0)
- fprintf(stderr, "/etc/fstab file missing -- Please install one.\n\n");
+ /* Only compiled in if BB_MTAB is not defined */
+ whine_if_fstab_is_missing();
if (argc == 1) {
- FILE *mountTable;
- if ((mountTable = setmntent ("/proc/mounts", "r"))) {
+ FILE *mountTable = setmntent (mtab_file, "r");
+ if (mountTable) {
struct mntent *m;
while ((m = getmntent (mountTable)) != 0) {
struct fstab* fstabItem;
m->mnt_type, m->mnt_opts);
}
endmntent (mountTable);
+ } else {
+ perror(mtab_file);
}
exit( TRUE);
}
argv++;
while (i > 0 && **argv) {
if (**argv == '-') {
- while (i>0 && *++(*argv)) switch (**argv) {
+ char *opt = *argv;
+ while (i>0 && *++opt) switch (*opt) {
case 'o':
if (--i == 0) {
- fprintf (stderr, "%s\n", mount_usage);
- exit( FALSE);
+ goto goodbye;
}
parse_mount_options (*(++argv), &flags, string_flags);
- --i;
- ++argv;
break;
case 'r':
flags |= MS_RDONLY;
break;
case 't':
if (--i == 0) {
- fprintf (stderr, "%s\n", mount_usage);
- exit( FALSE);
+ goto goodbye;
}
filesystemType = *(++argv);
- --i;
- ++argv;
break;
case 'w':
flags &= ~MS_RDONLY;
case 'a':
all = TRUE;
break;
+#ifdef BB_MTAB
+ case 'f':
+ fakeIt = TRUE;
+ break;
+ case 'n':
+ useMtab = FALSE;
+ break;
+#endif
case 'v':
case 'h':
case '-':
- fprintf (stderr, "%s\n", mount_usage);
- exit( TRUE);
- break;
+ goto goodbye;
}
} else {
if (device == NULL)
else if (directory == NULL)
directory=*argv;
else {
- fprintf (stderr, "%s\n", mount_usage);
- exit( TRUE);
+ goto goodbye;
}
}
i--;
}
if (all == TRUE) {
- long newFlags;
struct mntent *m;
FILE *f = setmntent ("/etc/fstab", "r");
(!strstr (m->mnt_type, "swap")) &&
(!strstr (m->mnt_type, "nfs")))
{
- newFlags = flags;
+ flags = 0;
*string_flags = '\0';
- parse_mount_options(m->mnt_opts, &newFlags, string_flags);
- mount_one (m->mnt_fsname, m->mnt_dir, m->mnt_type, newFlags, string_flags);
+ parse_mount_options(m->mnt_opts, &flags, string_flags);
+ mount_one (m->mnt_fsname, m->mnt_dir, m->mnt_type,
+ flags, string_flags, useMtab, fakeIt, extra_opts);
}
}
endmntent (f);
} else {
if (device && directory) {
+#ifdef BB_NFSMOUNT
+ if (strcmp(filesystemType, "nfs") == 0) {
+ if (nfsmount(device, directory, &flags, &extra_opts, &string_flags, 1) != 0)
+ exit(FALSE);
+ }
+#endif
exit (mount_one (device, directory, filesystemType,
- flags, string_flags));
+ flags, string_flags, useMtab, fakeIt, extra_opts));
} else {
- fprintf (stderr, "%s\n", mount_usage);
- exit( FALSE);
+ goto goodbye;
}
}
exit( TRUE);
+
+goodbye:
+ usage( mount_usage);
+}
+
+#if defined BB_FEATURE_MOUNT_LOOP
+static int set_loop(const char *device, const char *file, int offset, int *loopro)
+{
+ struct loop_info loopinfo;
+ int fd, ffd, mode;
+
+ mode = *loopro ? O_RDONLY : O_RDWR;
+ if ((ffd = open (file, mode)) < 0 && !*loopro
+ && (errno != EROFS || (ffd = open (file, mode = O_RDONLY)) < 0)) {
+ perror (file);
+ return 1;
+ }
+ if ((fd = open (device, mode)) < 0) {
+ close(ffd);
+ perror (device);
+ return 1;
+ }
+ *loopro = (mode == O_RDONLY);
+
+ memset(&loopinfo, 0, sizeof(loopinfo));
+ strncpy(loopinfo.lo_name, file, LO_NAME_SIZE);
+ loopinfo.lo_name[LO_NAME_SIZE-1] = 0;
+
+ loopinfo.lo_offset = offset;
+
+ loopinfo.lo_encrypt_key_size = 0;
+ if (ioctl(fd, LOOP_SET_FD, ffd) < 0) {
+ perror("ioctl: LOOP_SET_FD");
+ exit(1);
+ }
+ if (ioctl(fd, LOOP_SET_STATUS, &loopinfo) < 0) {
+ (void) ioctl(fd, LOOP_CLR_FD, 0);
+ perror("ioctl: LOOP_SET_STATUS");
+ exit(1);
+ }
+ close(fd);
+ close(ffd);
+ return 0;
+}
+
+static char *find_unused_loop_device (void)
+{
+ char dev[20];
+ int i, fd, somedev = 0, someloop = 0;
+ struct stat statbuf;
+ struct loop_info loopinfo;
+
+ for(i = 0; i < 256; i++) {
+ sprintf(dev, "/dev/loop%d", i);
+ if (stat (dev, &statbuf) == 0 && S_ISBLK(statbuf.st_mode)) {
+ somedev++;
+ fd = open (dev, O_RDONLY);
+ if (fd >= 0) {
+ if(ioctl (fd, LOOP_GET_STATUS, &loopinfo) == 0)
+ someloop++; /* in use */
+ else if (errno == ENXIO) {
+ close (fd);
+ return strdup(dev); /* probably free */
+ }
+ close (fd);
+ }
+ continue;
+ }
+ if (i >= 7)
+ break;
+ }
+ return NULL;
}
+#endif /* BB_FEATURE_MOUNT_LOOP */