*
* 2000-01-12 Ben Collins <bcollins@debian.org>, Borrowed utils-linux's
* mount to add loop support.
+ *
+ * 2000-04-30 Dave Cinege <dcinege@psychosis.com>
+ * Rewrote fstab while loop and lower mount section. Can now do
+ * single mounts from fstab. Can override fstab options for single
+ * mount. Common mount_one call for single mounts and 'all'. Fixed
+ * mtab updating and stale entries. Removed 'remount' default.
+ *
*/
-#include "internal.h"
+#include <limits.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <stdio.h>
#include <mntent.h>
-#include <sys/mount.h>
#include <ctype.h>
+#include "busybox.h"
#if defined BB_FEATURE_USE_DEVPS_PATCH
-#include <linux/devmtab.h>
-#endif
-#ifndef MS_RDONLY
-#include <linux/fs.h>
+# include <linux/devmtab.h> /* For Erik's nifty devmtab device driver */
#endif
+enum {
+ MS_MGC_VAL = 0xc0ed0000, /* Magic number indicatng "new" flags */
+ MS_RDONLY = 1, /* Mount read-only */
+ MS_NOSUID = 2, /* Ignore suid and sgid bits */
+ MS_NODEV = 4, /* Disallow access to device special files */
+ MS_NOEXEC = 8, /* Disallow program execution */
+ MS_SYNCHRONOUS = 16, /* Writes are synced at once */
+ MS_REMOUNT = 32, /* Alter flags of a mounted FS */
+ MS_MANDLOCK = 64, /* Allow mandatory locks on an FS */
+ S_QUOTA = 128, /* Quota initialized for file/directory/symlink */
+ S_APPEND = 256, /* Append-only file */
+ S_IMMUTABLE = 512, /* Immutable file */
+ MS_NOATIME = 1024, /* Do not update access times. */
+ MS_NODIRATIME = 2048, /* Do not update directory access times */
+ MS_BIND = 4096, /* Use the new linux 2.4.x "mount --bind" feature */
+};
+
#if defined BB_FEATURE_MOUNT_LOOP
#include <fcntl.h>
#include <sys/ioctl.h>
-#include <linux/loop.h>
-
-
static int use_loop = FALSE;
#endif
-extern const char mtab_file[]; /* Defined in utility.c */
+extern int mount (__const char *__special_file, __const char *__dir,
+ __const char *__fstype, unsigned long int __rwflag,
+ __const void *__data);
+extern int umount (__const char *__special_file);
+extern int umount2 (__const char *__special_file, int __flags);
-static const char mount_usage[] =
- "mount [flags] device directory [-o options,more-options]\n"
-#ifndef BB_FEATURE_TRIVIAL_HELP
- "\nMount a filesystem\n\n"
- "Flags:\n"
- "\t-a:\t\tMount all filesystems in fstab.\n"
-#ifdef BB_MTAB
- "\t-f:\t\t\"Fake\" mount. Add entry to mount table but don't mount it.\n"
- "\t-n:\t\tDon't write a mount table entry.\n"
-#endif
- "\t-o option:\tOne of many filesystem options, listed below.\n"
- "\t-r:\t\tMount the filesystem read-only.\n"
- "\t-t fs-type:\tSpecify the filesystem type.\n"
- "\t-w:\t\tMount for reading and writing (default).\n"
- "\n"
- "Options for use with the \"-o\" flag:\n"
- "\tasync/sync:\tWrites are asynchronous / synchronous.\n"
- "\tatime/noatime:\tEnable / disable updates to inode access times.\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:\t\tMounts a file via loop device.\n"
-#endif
- "\tsuid/nosuid:\tAllow set-user-id-root programs / disallow them.\n"
- "\tremount:\tRe-mount a currently-mounted filesystem, changing its flags.\n"
- "\tro/rw:\t\tMount for read-only / read-write.\n"
- "\nThere are EVEN MORE flags that are specific to each filesystem.\n"
- "You'll have to see the written documentation for those.\n"
-#endif
- ;
+extern int sysfs( int option, unsigned int fs_index, char * buf);
+extern const char mtab_file[]; /* Defined in utility.c */
struct mount_options {
const char *name;
{"rw", ~MS_RDONLY, 0},
{"suid", ~MS_NOSUID, 0},
{"sync", ~0, MS_SYNCHRONOUS},
+ {"bind", ~0, MS_BIND},
{0, 0, 0}
};
char *mtab_opts)
{
int status = 0;
+#if defined BB_FEATURE_MOUNT_LOOP
char *lofile = NULL;
+#endif
-#if defined BB_MTAB
if (fakeIt == FALSE)
-#endif
{
#if defined BB_FEATURE_MOUNT_LOOP
if (use_loop==TRUE) {
int loro = flags & MS_RDONLY;
- char *lofile = specialfile;
+
+ lofile = specialfile;
specialfile = find_unused_loop_device();
if (specialfile == NULL) {
- fprintf(stderr, "Could not find a spare loop device\n");
- return (FALSE);
+ error_msg_and_die("Could not find a spare loop device");
}
if (set_loop(specialfile, lofile, 0, &loro)) {
- fprintf(stderr, "Could not setup loop device\n");
- return (FALSE);
+ error_msg_and_die("Could not setup loop device");
}
if (!(flags & MS_RDONLY) && loro) { /* loop is ro, but wanted rw */
- fprintf(stderr, "WARNING: loop device is read-only\n");
+ error_msg("WARNING: loop device is read-only");
flags &= ~MS_RDONLY;
}
}
#endif
- status =
- mount(specialfile, dir, filesystemtype, flags, string_flags);
+ status = mount(specialfile, dir, filesystemtype, flags, string_flags);
+ if (errno == EROFS) {
+ error_msg("%s is write-protected, mounting read-only", specialfile);
+ status = mount(specialfile, dir, filesystemtype, flags |= MS_RDONLY, string_flags);
+ }
}
/* If the mount was sucessful, do anything needed, then return TRUE */
- if (status == 0) {
+ if (status == 0 || fakeIt==TRUE) {
-#if defined BB_MTAB
+#if defined BB_FEATURE_MTAB_SUPPORT
if (useMtab == TRUE) {
+ erase_mtab(specialfile); // Clean any stale entries
write_mtab(specialfile, dir, filesystemtype, flags, mtab_opts);
}
#endif
del_loop(specialfile);
}
#endif
+
+ if (errno == EPERM) {
+ error_msg_and_die("permission denied. Are you root?");
+ }
+
return (FALSE);
}
/* Seperate standard mount options from the nonstandard string options */
static void
-parse_mount_options(char *options, unsigned long *flags, char *strflags)
+parse_mount_options(char *options, int *flags, char *strflags)
{
while (options) {
int gotone = FALSE;
}
}
-int
+extern int
mount_one(char *blockDevice, char *directory, char *filesystemType,
unsigned long flags, char *string_flags, int useMtab, int fakeIt,
char *mtab_opts, int whineOnErrors)
{
int status = 0;
-#if defined BB_FEATURE_USE_PROCFS
- char buf[255];
if (strcmp(filesystemType, "auto") == 0) {
- FILE *f = fopen("/proc/filesystems", "r");
-
- if (f == NULL)
- return (FALSE);
-
- while (fgets(buf, sizeof(buf), f) != NULL) {
- filesystemType = buf;
- if (*filesystemType == '\t') { // Not a nodev filesystem
-
- // Add NULL termination to each line
- while (*filesystemType && *filesystemType != '\n')
- filesystemType++;
- *filesystemType = '\0';
-
- filesystemType = buf;
- filesystemType++; // hop past tab
-
+ static const char *noauto_array[] = { "tmpfs", "shm", "proc", "ramfs", "devpts", "devfs", 0 };
+ const char **noauto_fstype;
+ const int num_of_filesystems = sysfs(3, 0, 0);
+ char buf[255];
+ int i=0;
+
+ filesystemType=buf;
+
+ while(i < num_of_filesystems) {
+ sysfs(2, i++, filesystemType);
+ for (noauto_fstype = noauto_array; *noauto_fstype; noauto_fstype++) {
+ if (!strcmp(filesystemType, *noauto_fstype)) {
+ break;
+ }
+ }
+ if (!*noauto_fstype) {
status = do_mount(blockDevice, directory, filesystemType,
- flags | MS_MGC_VAL, string_flags,
- useMtab, fakeIt, mtab_opts);
+ flags | MS_MGC_VAL, string_flags,
+ useMtab, fakeIt, mtab_opts);
if (status == TRUE)
break;
}
}
- fclose(f);
- } else
-#endif
-#if defined BB_FEATURE_USE_DEVPS_PATCH
- if (strcmp(filesystemType, "auto") == 0) {
- int fd, i, numfilesystems;
- char device[] = "/dev/mtab";
- struct k_fstype *fslist;
-
- /* open device */
- fd = open(device, O_RDONLY);
- if (fd < 0)
- fatalError("open failed for `%s': %s\n", device, strerror (errno));
-
- /* How many filesystems? We need to know to allocate enough space */
- numfilesystems = ioctl (fd, DEVMTAB_COUNT_FILESYSTEMS);
- if (numfilesystems<0)
- fatalError("\nDEVMTAB_COUNT_FILESYSTEMS: %s\n", strerror (errno));
- fslist = (struct k_fstype *) calloc ( numfilesystems, sizeof(struct k_fstype));
-
- /* Grab the list of available filesystems */
- status = ioctl (fd, DEVMTAB_GET_FILESYSTEMS, fslist);
- if (status<0)
- fatalError("\nDEVMTAB_GET_FILESYSTEMS: %s\n", strerror (errno));
-
- /* Walk the list trying to mount filesystems
- * that do not claim to be nodev filesystems */
- for( i = 0 ; i < numfilesystems ; i++) {
- if (fslist[i].mnt_nodev)
- continue;
- status = do_mount(blockDevice, directory, fslist[i].mnt_type,
- flags | MS_MGC_VAL, string_flags,
- useMtab, fakeIt, mtab_opts);
- if (status == TRUE)
- break;
- }
- free( fslist);
- close(fd);
- } else
-#endif
- {
+ } else {
status = do_mount(blockDevice, directory, filesystemType,
- flags | MS_MGC_VAL, string_flags, useMtab,
- fakeIt, mtab_opts);
+ flags | MS_MGC_VAL, string_flags, useMtab,
+ fakeIt, mtab_opts);
}
- if (status == FALSE && whineOnErrors == TRUE) {
+ if (status == FALSE) {
if (whineOnErrors == TRUE) {
- fprintf(stderr, "Mounting %s on %s failed: %s\n",
- blockDevice, directory, strerror(errno));
+ perror_msg("Mounting %s on %s failed", blockDevice, directory);
}
return (FALSE);
}
return (TRUE);
}
+void show_mounts()
+{
+#if defined BB_FEATURE_USE_DEVPS_PATCH
+ int fd, i, numfilesystems;
+ char device[] = "/dev/mtab";
+ struct k_mntent *mntentlist;
+
+ /* open device */
+ fd = open(device, O_RDONLY);
+ if (fd < 0)
+ perror_msg_and_die("open failed for `%s'", device);
+
+ /* How many mounted filesystems? We need to know to
+ * allocate enough space for later... */
+ numfilesystems = ioctl (fd, DEVMTAB_COUNT_MOUNTS);
+ if (numfilesystems<0)
+ perror_msg_and_die( "\nDEVMTAB_COUNT_MOUNTS");
+ mntentlist = (struct k_mntent *) xcalloc ( numfilesystems, sizeof(struct k_mntent));
+
+ /* Grab the list of mounted filesystems */
+ if (ioctl (fd, DEVMTAB_GET_MOUNTS, mntentlist)<0)
+ perror_msg_and_die( "\nDEVMTAB_GET_MOUNTS");
+
+ for( i = 0 ; i < numfilesystems ; i++) {
+ printf( "%s %s %s %s %d %d\n", mntentlist[i].mnt_fsname,
+ mntentlist[i].mnt_dir, mntentlist[i].mnt_type,
+ mntentlist[i].mnt_opts, mntentlist[i].mnt_freq,
+ mntentlist[i].mnt_passno);
+ }
+#ifdef BB_FEATURE_CLEAN_UP
+ /* Don't bother to close files or free memory. Exit
+ * does that automagically, so we can save a few bytes */
+ free( mntentlist);
+ close(fd);
+#endif
+ exit(EXIT_SUCCESS);
+#else
+ FILE *mountTable = setmntent(mtab_file, "r");
+
+ if (mountTable) {
+ struct mntent *m;
+
+ while ((m = getmntent(mountTable)) != 0) {
+ char *blockDevice = m->mnt_fsname;
+ if (strcmp(blockDevice, "/dev/root") == 0) {
+ blockDevice = find_real_root_device_name(blockDevice);
+ }
+ printf("%s on %s type %s (%s)\n", blockDevice, m->mnt_dir,
+ m->mnt_type, m->mnt_opts);
+#ifdef BB_FEATURE_CLEAN_UP
+ if(blockDevice != m->mnt_fsname)
+ free(blockDevice);
+#endif
+ }
+ endmntent(mountTable);
+ } else {
+ perror_msg_and_die("%s", mtab_file);
+ }
+ exit(EXIT_SUCCESS);
+#endif
+}
+
extern int mount_main(int argc, char **argv)
{
+ struct stat statbuf;
char string_flags_buf[1024] = "";
char *string_flags = string_flags_buf;
char *extra_opts = string_flags_buf;
- unsigned long flags = 0;
+ int flags = 0;
char *filesystemType = "auto";
- char *device = NULL;
- char *directory = NULL;
+ char *device = xmalloc(PATH_MAX);
+ char *directory = xmalloc(PATH_MAX);
int all = FALSE;
int fakeIt = FALSE;
int useMtab = TRUE;
- int i;
+ int rc = EXIT_FAILURE;
+ int fstabmount = FALSE;
+ int opt;
-#if defined BB_FEATURE_USE_DEVPS_PATCH
- if (argc == 1) {
- int fd, i, numfilesystems;
- char device[] = "/dev/mtab";
- struct k_mntent *mntentlist;
-
- /* open device */
- fd = open(device, O_RDONLY);
- if (fd < 0)
- fatalError("open failed for `%s': %s\n", device, strerror (errno));
-
- /* How many mounted filesystems? We need to know to
- * allocate enough space for later... */
- numfilesystems = ioctl (fd, DEVMTAB_COUNT_MOUNTS);
- if (numfilesystems<0)
- fatalError( "\nDEVMTAB_COUNT_MOUNTS: %s\n", strerror (errno));
- mntentlist = (struct k_mntent *) calloc ( numfilesystems, sizeof(struct k_mntent));
-
- /* Grab the list of mounted filesystems */
- if (ioctl (fd, DEVMTAB_GET_MOUNTS, mntentlist)<0)
- fatalError( "\nDEVMTAB_GET_MOUNTS: %s\n", strerror (errno));
-
- for( i = 0 ; i < numfilesystems ; i++) {
- fprintf( stdout, "%s %s %s %s %d %d\n", mntentlist[i].mnt_fsname,
- mntentlist[i].mnt_dir, mntentlist[i].mnt_type,
- mntentlist[i].mnt_opts, mntentlist[i].mnt_freq,
- mntentlist[i].mnt_passno);
- }
- /* Don't bother to close files or free memory. Exit
- * does that automagically, so we can save a few bytes */
-#if 0
- free( mntentlist);
- close(fd);
+ /* Parse options */
+ while ((opt = getopt(argc, argv, "o:rt:wafnv")) > 0) {
+ switch (opt) {
+ case 'o':
+ parse_mount_options(optarg, &flags, string_flags);
+ break;
+ case 'r':
+ flags |= MS_RDONLY;
+ break;
+ case 't':
+ filesystemType = optarg;
+ break;
+ case 'w':
+ flags &= ~MS_RDONLY;
+ break;
+ case 'a':
+ all = TRUE;
+ break;
+ case 'f':
+ fakeIt = TRUE;
+ break;
+#ifdef BB_FEATURE_MTAB_SUPPORT
+ case 'n':
+ useMtab = FALSE;
+ break;
#endif
- exit(TRUE);
+ case 'v':
+ break; /* ignore -v */
+ }
}
-#else
- if (argc == 1) {
- FILE *mountTable = setmntent(mtab_file, "r");
- if (mountTable) {
- struct mntent *m;
+ if (!all && optind == argc)
+ show_mounts();
- while ((m = getmntent(mountTable)) != 0) {
- char *blockDevice = m->mnt_fsname;
- if (strcmp(blockDevice, "/dev/root") == 0) {
- find_real_root_device_name( blockDevice);
- }
- printf("%s on %s type %s (%s)\n", blockDevice, m->mnt_dir,
- m->mnt_type, m->mnt_opts);
- }
- endmntent(mountTable);
+ if (optind < argc) {
+ /* if device is a filename get its real path */
+ if (stat(argv[optind], &statbuf) == 0) {
+ realpath(argv[optind], device);
} else {
- perror(mtab_file);
+ safe_strncpy(device, argv[optind], PATH_MAX);
}
- exit(TRUE);
}
-#endif
- /* Parse options */
- i = --argc;
- argv++;
- while (i > 0 && **argv) {
- if (**argv == '-') {
- char *opt = *argv;
-
- while (i > 0 && *++opt)
- switch (*opt) {
- case 'o':
- if (--i == 0) {
- goto goodbye;
- }
- parse_mount_options(*(++argv), &flags, string_flags);
- break;
- case 'r':
- flags |= MS_RDONLY;
- break;
- case 't':
- if (--i == 0) {
- goto goodbye;
- }
- filesystemType = *(++argv);
- break;
- case 'w':
- flags &= ~MS_RDONLY;
- break;
- case 'a':
- all = TRUE;
- break;
- case 'f':
- fakeIt = TRUE;
- break;
-#ifdef BB_MTAB
- case 'n':
- useMtab = FALSE;
- break;
-#endif
- case 'v':
- break; /* ignore -v */
- case 'h':
- case '-':
- goto goodbye;
- }
- } else {
- if (device == NULL)
- device = *argv;
- else if (directory == NULL)
- directory = *argv;
- else {
- goto goodbye;
- }
+ if (optind + 1 < argc) {
+ if (realpath(argv[optind + 1], directory) == NULL) {
+ perror_msg_and_die("%s", directory);
}
- i--;
- argv++;
}
-
- if (all == TRUE) {
- struct mntent *m;
+
+ if (all == TRUE || optind + 1 == argc) {
+ struct mntent *m = NULL;
FILE *f = setmntent("/etc/fstab", "r");
+ fstabmount = TRUE;
if (f == NULL)
- fatalError( "\nCannot read /etc/fstab: %s\n", strerror (errno));
+ perror_msg_and_die( "\nCannot read /etc/fstab");
while ((m = getmntent(f)) != NULL) {
- // If the filesystem isn't noauto,
- // and isn't swap or nfs, then mount it
- if ((!strstr(m->mnt_opts, "noauto")) &&
- (!strstr(m->mnt_type, "swap")) &&
- (!strstr(m->mnt_type, "nfs"))) {
+ if (all == FALSE && optind + 1 == argc && (
+ (strcmp(device, m->mnt_fsname) != 0) &&
+ (strcmp(device, m->mnt_dir) != 0) ) ) {
+ continue;
+ }
+
+ if (all == TRUE && ( // If we're mounting 'all'
+ (strstr(m->mnt_opts, "noauto")) || // and the file system isn't noauto,
+ (strstr(m->mnt_type, "swap")) || // and isn't swap or nfs, then mount it
+ (strstr(m->mnt_type, "nfs")) ) ) {
+ continue;
+ }
+
+ if (all == TRUE || flags == 0) { // Allow single mount to override fstab flags
flags = 0;
*string_flags = '\0';
parse_mount_options(m->mnt_opts, &flags, string_flags);
- /* If the directory is /, try to remount
- * with the options specified in fstab */
- if (m->mnt_dir[0] == '/' && m->mnt_dir[1] == '\0') {
- flags |= MS_REMOUNT;
- }
- if (mount_one(m->mnt_fsname, m->mnt_dir, m->mnt_type,
- flags, string_flags, useMtab, fakeIt,
- extra_opts, FALSE))
- {
- /* Try again, but this time try a remount */
- mount_one(m->mnt_fsname, m->mnt_dir, m->mnt_type,
- flags|MS_REMOUNT, string_flags, useMtab, fakeIt,
- extra_opts, TRUE);
- }
}
- }
- endmntent(f);
- } else {
- if (device && directory) {
+
+ strcpy(device, m->mnt_fsname);
+ strcpy(directory, m->mnt_dir);
+ filesystemType = strdup(m->mnt_type);
+singlemount:
+ string_flags = strdup(string_flags);
+ rc = EXIT_SUCCESS;
#ifdef BB_NFSMOUNT
+ if (strchr(device, ':') != NULL)
+ filesystemType = "nfs";
if (strcmp(filesystemType, "nfs") == 0) {
- if (nfsmount
- (device, directory, &flags, &extra_opts, &string_flags,
- 1) != 0)
- exit(FALSE);
+ if (nfsmount (device, directory, &flags, &extra_opts,
+ &string_flags, 1)) {
+ perror_msg("nfsmount failed");
+ rc = EXIT_FAILURE;
+ }
}
#endif
- exit(mount_one(device, directory, filesystemType,
- flags, string_flags, useMtab, fakeIt,
- extra_opts, TRUE));
- } else {
- goto goodbye;
+ if (!mount_one(device, directory, filesystemType, flags,
+ string_flags, useMtab, fakeIt, extra_opts, TRUE))
+ rc = EXIT_FAILURE;
+
+ if (all == FALSE)
+ break;
}
+ if (fstabmount == TRUE)
+ endmntent(f);
+
+ if (all == FALSE && fstabmount == TRUE && m == NULL)
+ fprintf(stderr, "Can't find %s in /etc/fstab\n", device);
+
+ return rc;
}
- exit(TRUE);
-
- goodbye:
- usage(mount_usage);
+
+ goto singlemount;
}
projects / oweals / busybox.git / blobdiff