+/* vi: set sw=4 ts=4: */
/*
* Mini mount implementation for busybox
*
- * Copyright (C) 1999 by Erik Andersen <andersee@debian.org>
+ * Copyright (C) 1995, 1996 by Bruce Perens <bruce@pixar.com>.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* will try mounting stuff with all fses when passed -t auto
*
* 1999-04-17 Dave Cinege...Rewrote -t auto. Fixed ro mtab.
- * 1999-10-07 Erik Andersen. Removed mtab usage, major adjustments,
- * and some serious dieting all around.
-*/
+ *
+ * 1999-10-07 Erik Andersen <andersen@lineo.com>, <andersee@debian.org>.
+ * 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.
+ *
+ * 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 "busybox.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 <fstab.h>
-
-const char mount_usage[] = "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"
- "\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"
- "\t-w:\tMount for reading and writing (default).\n"
- "\n"
- "Options for use with the \"-o\" flag:\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"
- "\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"
- "\t"
- "There are EVEN MORE flags that are specific to each filesystem.\n"
- "You'll have to see the written documentation for those.\n";
+#if defined BB_FEATURE_USE_DEVPS_PATCH
+#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 */
+};
+
+
+#if defined BB_FEATURE_MOUNT_LOOP
+#include <fcntl.h>
+#include <sys/ioctl.h>
+static int use_loop = FALSE;
+#endif
+
+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);
+
+
+extern const char mtab_file[]; /* Defined in utility.c */
struct mount_options {
- const char *name;
- unsigned long and;
- unsigned long or;
+ const char *name;
+ unsigned long and;
+ unsigned long or;
};
static const struct mount_options mount_options[] = {
- {"async", ~MS_SYNCHRONOUS, 0},
- {"defaults", ~0, 0},
- {"dev", ~MS_NODEV, 0},
- {"exec", ~MS_NOEXEC, 0},
- {"nodev", ~0, MS_NODEV},
- {"noexec", ~0, MS_NOEXEC},
- {"nosuid", ~0, MS_NOSUID},
- {"remount", ~0, MS_REMOUNT},
- {"ro", ~0, MS_RDONLY},
- {"rw", ~MS_RDONLY, 0},
- {"suid", ~MS_NOSUID, 0},
- {"sync", ~0, MS_SYNCHRONOUS},
- {0, 0, 0}
+ {"async", ~MS_SYNCHRONOUS, 0},
+ {"atime", ~0, ~MS_NOATIME},
+ {"defaults", ~0, 0},
+ {"dev", ~MS_NODEV, 0},
+ {"diratime", ~0, ~MS_NODIRATIME},
+ {"exec", ~MS_NOEXEC, 0},
+ {"noatime", ~0, MS_NOATIME},
+ {"nodev", ~0, MS_NODEV},
+ {"nodiratime", ~0, MS_NODIRATIME},
+ {"noexec", ~0, MS_NOEXEC},
+ {"nosuid", ~0, MS_NOSUID},
+ {"remount", ~0, MS_REMOUNT},
+ {"ro", ~0, MS_RDONLY},
+ {"rw", ~MS_RDONLY, 0},
+ {"suid", ~MS_NOSUID, 0},
+ {"sync", ~0, MS_SYNCHRONOUS},
+ {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_FEATURE_MOUNT_LOOP
+ char *lofile = NULL;
+#endif
+
+ if (fakeIt == FALSE)
+ {
+#if defined BB_FEATURE_MOUNT_LOOP
+ if (use_loop==TRUE) {
+ int loro = flags & MS_RDONLY;
+ char *lofile = specialfile;
+
+ specialfile = find_unused_loop_device();
+ if (specialfile == NULL) {
+ error_msg_and_die("Could not find a spare loop device");
+ }
+ if (set_loop(specialfile, lofile, 0, &loro)) {
+ error_msg_and_die("Could not setup loop device");
+ }
+ if (!(flags & MS_RDONLY) && loro) { /* loop is ro, but wanted rw */
+ error_msg("WARNING: loop device is read-only");
+ flags &= ~MS_RDONLY;
+ }
+ }
+#endif
+ 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 || fakeIt==TRUE) {
+
+#if defined BB_MTAB
+ if (useMtab == TRUE) {
+ erase_mtab(specialfile); // Clean any stale entries
+ write_mtab(specialfile, dir, filesystemtype, flags, mtab_opts);
+ }
+#endif
+ return (TRUE);
+ }
+
+ /* Bummer. mount failed. Clean up */
+#if defined BB_FEATURE_MOUNT_LOOP
+ if (lofile != NULL) {
+ 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 *data)
+parse_mount_options(char *options, int *flags, char *strflags)
{
- printf("option=%s\n", options);
- while (*options) {
- char *comma = strchr (options, ',');
- const struct mount_options* f = mount_options;
- if (comma)
- *comma = '\0';
-
- printf("checking option=%s vs %s\n", options, f->name);
- while (f->name != 0) {
- printf("checking option=%s vs %s\n", options, f->name);
- if (strcasecmp (f->name, options) == 0) {
- *flags &= f->and;
- *flags |= f->or;
- return;
- }
- f++;
- }
- if (*data) {
- data += strlen (data);
- *data++ = ',';
+ while (options) {
+ int gotone = FALSE;
+ char *comma = strchr(options, ',');
+ const struct mount_options *f = mount_options;
+
+ if (comma)
+ *comma = '\0';
+
+ while (f->name != 0) {
+ if (strcasecmp(f->name, options) == 0) {
+
+ *flags &= f->and;
+ *flags |= f->or;
+ gotone = TRUE;
+ break;
+ }
+ f++;
+ }
+#if defined BB_FEATURE_MOUNT_LOOP
+ if (gotone == FALSE && !strcasecmp("loop", options)) { /* loop device support */
+ use_loop = TRUE;
+ gotone = TRUE;
+ }
+#endif
+ if (*strflags && strflags != '\0' && gotone == FALSE) {
+ char *temp = strflags;
+
+ temp += strlen(strflags);
+ *temp++ = ',';
+ *temp++ = '\0';
+ }
+ if (gotone == FALSE)
+ strcat(strflags, options);
+ if (comma) {
+ *comma = ',';
+ options = ++comma;
+ } else {
+ break;
+ }
}
- strcpy (data, options);
- if (comma) {
- *comma = ',';
- options = ++comma;
- } else
- break;
- }
}
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 whineOnErrors)
{
- int status = 0;
+ int status = 0;
+
+#if defined BB_FEATURE_USE_PROCFS
+ char buf[255];
+ if (strcmp(filesystemType, "auto") == 0) {
+ FILE *f = fopen("/proc/filesystems", "r");
- char buf[255];
+ if (f == NULL)
+ return (FALSE);
- if (strcmp(filesystemType, "auto") == 0) {
- FILE *f = fopen ("/proc/filesystems", "r");
+ while (fgets(buf, sizeof(buf), f) != NULL) {
+ filesystemType = buf;
+ if (*filesystemType == '\t') { // Not a nodev filesystem
- if (f == NULL)
- return( FALSE);
+ // Add NULL termination to each line
+ while (*filesystemType && *filesystemType != '\n')
+ filesystemType++;
+ *filesystemType = '\0';
- while (fgets (buf, sizeof (buf), f) != NULL) {
- filesystemType = buf;
- if (*filesystemType == '\t') { // Not a nodev filesystem
+ filesystemType = buf;
+ filesystemType++; // hop past tab
- // Add NULL termination to each line
- while (*filesystemType && *filesystemType != '\n')
- filesystemType++;
- *filesystemType = '\0';
+ status = do_mount(blockDevice, directory, filesystemType,
+ 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;
- filesystemType = buf;
- filesystemType++; // hop past tab
+ /* open device */
+ fd = open(device, O_RDONLY);
+ if (fd < 0)
+ perror_msg_and_die("open failed for `%s'", device);
- status = mount (blockDevice, directory, filesystemType,
- flags | MS_MGC_VAL, string_flags);
- if (status == 0)
- break;
- }
+ /* How many filesystems? We need to know to allocate enough space */
+ numfilesystems = ioctl (fd, DEVMTAB_COUNT_FILESYSTEMS);
+ if (numfilesystems<0)
+ perror_msg_and_die("\nDEVMTAB_COUNT_FILESYSTEMS");
+ fslist = (struct k_fstype *) xcalloc ( numfilesystems, sizeof(struct k_fstype));
+
+ /* Grab the list of available filesystems */
+ status = ioctl (fd, DEVMTAB_GET_FILESYSTEMS, fslist);
+ if (status<0)
+ perror_msg_and_die("\nDEVMTAB_GET_FILESYSTEMS");
+
+ /* 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
+ {
+ status = do_mount(blockDevice, directory, filesystemType,
+ flags | MS_MGC_VAL, string_flags, useMtab,
+ fakeIt, mtab_opts);
}
- fclose (f);
- } else {
- status = mount (blockDevice, directory, filesystemType,
- flags | MS_MGC_VAL, string_flags);
- }
-
- if (status) {
- fprintf (stderr, "Mounting %s on %s failed: %s\n",
- blockDevice, directory, strerror(errno));
- return (FALSE);
- }
- return (TRUE);
+
+ if (status == FALSE) {
+ if (whineOnErrors == TRUE) {
+ perror_msg("Mounting %s on %s failed", blockDevice, directory);
+ }
+ return (FALSE);
+ }
+ return (TRUE);
}
-extern int mount_main (int argc, char **argv)
+extern int mount_main(int argc, char **argv)
{
- char string_flags[1024]="\0";
- unsigned long flags = 0;
- char *filesystemType = "auto";
- int all = 0;
- int i = argc;
-
- if (argc == 1) {
- FILE *mountTable;
- if ((mountTable = setmntent ("/proc/mounts", "r"))) {
- struct mntent *m;
- while ((m = getmntent (mountTable)) != 0) {
- char *blockDevice = m->mnt_fsname;
- if (strcmp (blockDevice, "/dev/root") == 0)
- blockDevice = (getfsfile ("/"))->fs_spec;
- printf ("%s on %s type %s (%s)\n", blockDevice, m->mnt_dir,
- m->mnt_type, m->mnt_opts);
- }
- endmntent (mountTable);
+ char string_flags_buf[1024] = "";
+ char *string_flags = string_flags_buf;
+ char *extra_opts = string_flags_buf;
+ int flags = 0;
+ char *filesystemType = "auto";
+ char *device = NULL;
+ char *directory = NULL;
+ int all = FALSE;
+ int fakeIt = FALSE;
+ int useMtab = TRUE;
+ int i;
+ int rc = EXIT_FAILURE;
+ int fstabmount = FALSE;
+
+#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)
+ 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
+ return EXIT_SUCCESS;
}
- return( TRUE);
- }
-
-
- /* Parse options */
- while (**argv) {
- if (**argv == '-') {
- switch (**argv) {
- case 'o':
- if (++argv == 0) {
- fprintf (stderr, "%s\n", mount_usage);
- return( FALSE);
+#else
+ if (argc == 1) {
+ 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) {
+ 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);
+ } else {
+ perror_msg_and_die("%s", mtab_file);
}
- parse_mount_options (*argv, &flags, string_flags);
- argc--;
- argv++;
- break;
- case 'r':
- flags |= MS_RDONLY;
- break;
- case 't':
- if (++argv == 0) {
- fprintf (stderr, "%s\n", mount_usage);
- return( FALSE);
+ return EXIT_SUCCESS;
+ }
+#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;
+ }
}
- filesystemType = *argv;
- argc--;
+ i--;
argv++;
- break;
- case 'w':
- flags &= ~MS_RDONLY;
- break;
- case 'a':
- all = 1;
- break;
- case 'v':
- case 'h':
- case '-':
- fprintf (stderr, "%s\n", mount_usage);
- return( TRUE);
- }
}
- i--;
- argv++;
- }
- if (all == 1) {
- struct mntent *m;
- FILE *f = setmntent ("/etc/fstab", "r");
+ if (all == TRUE || directory == NULL) {
+ struct mntent *m;
+ FILE *f = setmntent("/etc/fstab", "r");
+ fstabmount = TRUE;
- if (f == NULL) {
- perror("/etc/fstab");
- return( FALSE);
- }
- // FIXME: Combine read routine (make new function) with unmount_all
- // to save space.
-
- while ((m = getmntent (f)) != NULL) {
- // If the file system isn't noauto, and isn't mounted on /, mount
- // it
- if ((!strstr (m->mnt_opts, "noauto"))
- && (m->mnt_dir[1] != '\0') && !((m->mnt_type[0] == 's')
- && (m->mnt_type[1] == 'w'))
- && !((m->mnt_type[0] == 'n') && (m->mnt_type[1] == 'f'))) {
- mount_one (m->mnt_fsname, m->mnt_dir, m->mnt_type, flags,
- m->mnt_opts);
- }
- }
+ if (f == NULL)
+ perror_msg_and_die( "\nCannot read /etc/fstab");
- endmntent (f);
- } else {
- if (argc >= 3) {
- while (i < argc)
- argv--;
- while (**argv == '-')
- argv++;
- if (mount_one
- (*argv, *(argv+1), filesystemType, flags,
- string_flags) == 0) return 0;
- else
- return( FALSE);
- } else {
- fprintf (stderr, "%s\n", mount_usage);
- return( FALSE);
+ while ((m = getmntent(f)) != NULL) {
+ if (all == FALSE && directory == NULL && (
+ (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);
+ }
+
+ device = strdup(m->mnt_fsname);
+ directory = strdup(m->mnt_dir);
+ filesystemType = strdup(m->mnt_type);
+singlemount:
+ rc = EXIT_SUCCESS;
+#ifdef BB_NFSMOUNT
+ if (strchr(device, ':') != NULL)
+ filesystemType = "nfs";
+ if (strcmp(filesystemType, "nfs") == 0) {
+ rc = nfsmount (device, directory, &flags,
+ &extra_opts, &string_flags, 1);
+ if ( rc != 0) {
+ perror_msg_and_die("nfsmount failed");
+ rc = EXIT_FAILURE;
+ }
+ }
+#endif
+ 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 && directory == NULL)
+ fprintf(stderr, "Can't find %s in /etc/fstab\n", device);
+
+ exit(rc);
}
- }
- return( TRUE);
+
+ goto singlemount;
+
+goodbye:
+ usage(mount_usage);
}
projects / oweals / busybox.git / blobdiff