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-rw-r--r--busybox/util-linux/mount.c497
1 files changed, 497 insertions, 0 deletions
diff --git a/busybox/util-linux/mount.c b/busybox/util-linux/mount.c
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+++ b/busybox/util-linux/mount.c
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+/* vi: set sw=4 ts=4: */
+/*
+ * Mini mount implementation for busybox
+ *
+ * Copyright (C) 1995, 1996 by Bruce Perens <bruce@pixar.com>.
+ * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
+ *
+ * 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
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ * 3/21/1999 Charles P. Wright <cpwright@cpwright.com>
+ * searches through fstab when -a is passed
+ * 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 <andersen@codepoet.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 support 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 <limits.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <errno.h>
+#include <string.h>
+#include <stdio.h>
+#include <mntent.h>
+#include <ctype.h>
+#include "busybox.h"
+
+#ifdef CONFIG_NFSMOUNT
+#if defined(__UCLIBC__) && ! defined(__UCLIBC_HAS_RPC__)
+#error "You need to build uClibc with UCLIBC_HAS_RPC for busybox mount with NFS support to compile."
+#endif
+#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 */
+ MS_MOVE = 8192, /* Use the new linux 2.4.x "mount --move" feature */
+};
+
+
+#if defined CONFIG_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 int sysfs(int option, unsigned int fs_index, char *buf);
+
+struct mount_options {
+ const char *name;
+ unsigned long and;
+ unsigned long or;
+};
+
+static const struct mount_options mount_options[] = {
+ {"async", ~MS_SYNCHRONOUS, 0},
+ {"atime", ~0, ~MS_NOATIME},
+ {"defaults", ~0, 0},
+ {"noauto", ~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},
+ {"bind", ~0, MS_BIND},
+ {"move", ~0, MS_MOVE},
+ {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 mount_all)
+{
+ int status = 0;
+
+#if defined CONFIG_FEATURE_MOUNT_LOOP
+ char *lofile = NULL;
+#endif
+
+ if (!fakeIt) {
+#if defined CONFIG_FEATURE_MOUNT_LOOP
+ if (use_loop == TRUE) {
+ int loro = flags & MS_RDONLY;
+
+ lofile = specialfile;
+
+ specialfile = find_unused_loop_device();
+ if (specialfile == NULL) {
+ bb_error_msg_and_die("Could not find a spare loop device");
+ }
+ if (set_loop(specialfile, lofile, 0, &loro)) {
+ bb_error_msg_and_die("Could not setup loop device");
+ }
+ if (!(flags & MS_RDONLY) && loro) { /* loop is ro, but wanted rw */
+ bb_error_msg("WARNING: loop device is read-only");
+ flags |= MS_RDONLY;
+ }
+ }
+#endif
+ status = mount(specialfile, dir, filesystemtype, flags, string_flags);
+ if (status < 0 && errno == EROFS) {
+ bb_error_msg("%s is write-protected, mounting read-only",
+ specialfile);
+ status = mount(specialfile, dir, filesystemtype, flags |=
+ MS_RDONLY, string_flags);
+ }
+ /* Don't whine about already mounted filesystems when mounting all. */
+ if (status < 0 && errno == EBUSY && mount_all) {
+ return TRUE;
+ }
+ }
+
+
+ /* If the mount was sucessful, do anything needed, then return TRUE */
+ if (status == 0 || fakeIt == TRUE) {
+
+#if defined CONFIG_FEATURE_MTAB_SUPPORT
+ if (useMtab) {
+ 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 CONFIG_FEATURE_MOUNT_LOOP
+ if (lofile != NULL) {
+ del_loop(specialfile);
+ }
+#endif
+
+ if (errno == EPERM) {
+ bb_error_msg_and_die(bb_msg_perm_denied_are_you_root);
+ }
+
+ return (FALSE);
+}
+
+
+static void paste_str(char **s1, const char *s2)
+{
+ *s1 = xrealloc(*s1, strlen(*s1) + strlen(s2) + 1);
+ strcat(*s1, s2);
+}
+
+/* Seperate standard mount options from the nonstandard string options */
+static void parse_mount_options(char *options, int *flags, char **strflags)
+{
+ 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 CONFIG_FEATURE_MOUNT_LOOP
+ if (!strcasecmp("loop", options)) { /* loop device support */
+ use_loop = TRUE;
+ gotone = TRUE;
+ }
+#endif
+ if (!gotone) {
+ if (**strflags) {
+ /* have previous parsed options */
+ paste_str(strflags, ",");
+ }
+ paste_str(strflags, options);
+ }
+ if (comma) {
+ *comma = ',';
+ options = ++comma;
+ } else {
+ break;
+ }
+ }
+}
+
+static 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 mount_all)
+{
+ int status = 0;
+ if (strcmp(filesystemType, "auto") == 0) {
+ char buf[255];
+ FILE *f;
+ int read_proc = 0;
+
+ f = fopen("/etc/filesystems", "r");
+
+ if (f) {
+ while (fgets(buf, sizeof(buf), f)) {
+ if (*buf == '*') {
+ read_proc = 1;
+ } else if (*buf == '#') {
+ continue;
+ } else {
+ filesystemType = buf;
+
+ /* Add NULL termination to each line */
+ while (*filesystemType && !isspace(*filesystemType)) {
+ filesystemType++;
+ }
+ *filesystemType = '\0';
+
+ filesystemType = buf;
+
+ if (bb_strlen(filesystemType)) {
+ status = do_mount(blockDevice, directory, filesystemType,
+ flags | MS_MGC_VAL, string_flags,
+ useMtab, fakeIt, mtab_opts, mount_all);
+ if (status) {
+ break;
+ }
+ }
+
+ }
+ }
+ fclose(f);
+ } else {
+ read_proc = 1;
+ }
+
+ if (read_proc && !status) {
+
+ f = bb_xfopen("/proc/filesystems", "r");
+
+ 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 */
+
+ status = do_mount(blockDevice, directory, filesystemType,
+ flags | MS_MGC_VAL, string_flags, useMtab,
+ fakeIt, mtab_opts, mount_all);
+ if (status) {
+ break;
+ }
+ }
+ }
+ fclose(f);
+ }
+ } else {
+ status = do_mount(blockDevice, directory, filesystemType,
+ flags | MS_MGC_VAL, string_flags, useMtab, fakeIt,
+ mtab_opts, mount_all);
+ }
+
+ if (!status) {
+ if (whineOnErrors) {
+ bb_perror_msg("Mounting %s on %s failed", blockDevice, directory);
+ }
+ return (FALSE);
+ }
+ return (TRUE);
+}
+
+static void show_mounts(char *onlytype)
+{
+ FILE *mountTable = setmntent(bb_path_mtab_file, "r");
+
+ if (mountTable) {
+ struct mntent *m;
+
+ while ((m = getmntent(mountTable)) != 0) {
+ char *blockDevice = m->mnt_fsname;
+
+ if (strcmp(blockDevice, "rootfs") == 0) {
+ continue;
+ } else if (strcmp(blockDevice, "/dev/root") == 0) {
+ blockDevice = find_real_root_device_name();
+ }
+ if (!onlytype || (strcmp(m->mnt_type, onlytype) == 0)) {
+ printf("%s on %s type %s (%s)\n", blockDevice, m->mnt_dir,
+ m->mnt_type, m->mnt_opts);
+ }
+#ifdef CONFIG_FEATURE_CLEAN_UP
+ if (blockDevice != m->mnt_fsname) {
+ free(blockDevice);
+ }
+#endif
+ }
+ endmntent(mountTable);
+ } else {
+ bb_perror_msg_and_die(bb_path_mtab_file);
+ }
+ exit(EXIT_SUCCESS);
+}
+
+extern int mount_main(int argc, char **argv)
+{
+ struct stat statbuf;
+ char *string_flags = bb_xstrdup("");
+ char *extra_opts;
+ int flags = 0;
+ char *filesystemType = "auto";
+ int got_filesystemType = 0;
+ char *device = xmalloc(PATH_MAX);
+ char *directory = xmalloc(PATH_MAX);
+ struct mntent *m = NULL;
+ int all = FALSE;
+ int fakeIt = FALSE;
+ int useMtab = TRUE;
+ int rc = EXIT_FAILURE;
+ FILE *f = 0;
+ int opt;
+
+ /* 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;
+ got_filesystemType = 1;
+ break;
+ case 'w':
+ flags &= ~MS_RDONLY;
+ break;
+ case 'a':
+ all = TRUE;
+ break;
+ case 'f':
+ fakeIt = TRUE;
+ break;
+ case 'n':
+#ifdef CONFIG_FEATURE_MTAB_SUPPORT
+ useMtab = FALSE;
+#endif
+ break;
+ case 'v':
+ break; /* ignore -v */
+ }
+ }
+
+ if (!all && (optind == argc)) {
+ show_mounts(got_filesystemType ? filesystemType : NULL);
+ }
+
+ if (optind < argc) {
+ /* if device is a filename get its real path */
+ if (stat(argv[optind], &statbuf) == 0) {
+ char *tmp = bb_simplify_path(argv[optind]);
+
+ safe_strncpy(device, tmp, PATH_MAX);
+ } else {
+ safe_strncpy(device, argv[optind], PATH_MAX);
+ }
+ }
+
+ if (optind + 1 < argc)
+ directory = bb_simplify_path(argv[optind + 1]);
+
+ if (all || optind + 1 == argc) {
+ f = setmntent("/etc/fstab", "r");
+
+ if (f == NULL)
+ bb_perror_msg_and_die("\nCannot read /etc/fstab");
+
+ while ((m = getmntent(f)) != NULL) {
+ if (!all && (optind + 1 == argc)
+ && ((strcmp(device, m->mnt_fsname) != 0)
+ && (strcmp(device, m->mnt_dir) != 0))) {
+ continue;
+ }
+
+ if (all && ( /* 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, then mount it */
+ {
+ continue;
+ }
+
+ if (all || flags == 0) { /* Allow single mount to override fstab flags */
+ flags = 0;
+ string_flags[0] = 0;
+ parse_mount_options(m->mnt_opts, &flags, &string_flags);
+ }
+
+ strcpy(device, m->mnt_fsname);
+ strcpy(directory, m->mnt_dir);
+ filesystemType = bb_xstrdup(m->mnt_type);
+ singlemount:
+ extra_opts = string_flags;
+ rc = EXIT_SUCCESS;
+#ifdef CONFIG_NFSMOUNT
+ if (strchr(device, ':') != NULL) {
+ filesystemType = "nfs";
+ if (nfsmount
+ (device, directory, &flags, &extra_opts, &string_flags,
+ 1)) {
+ bb_perror_msg("nfsmount failed");
+ rc = EXIT_FAILURE;
+ }
+ }
+#endif
+ if (!mount_one
+ (device, directory, filesystemType, flags, string_flags,
+ useMtab, fakeIt, extra_opts, TRUE, all)) {
+ rc = EXIT_FAILURE;
+ }
+ if (!all) {
+ break;
+ }
+ }
+ if (f) {
+ endmntent(f);
+ }
+ if (!all && f && m == NULL) {
+ fprintf(stderr, "Can't find %s in /etc/fstab\n", device);
+ }
+ return rc;
+ }
+
+ goto singlemount;
+}
generated by cgit v1.1 at 2025-04-01 20:07:36 +0000