| /* vi: set sw=4 ts=4: */ |
| /* |
| * Mini mount implementation for busybox |
| * |
| * 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 |
| * 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@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. |
| */ |
| |
| #include "internal.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> |
| #if defined BB_FEATURE_USE_DEVPS_PATCH |
| #include <linux/devmtab.h> |
| #endif |
| |
| /* 2.0.x. kernels don't know about MS_NODIRATIME */ |
| #ifndef MS_NODIRATIME |
| #define MS_NODIRATIME 2048 /* Do not update directory access times */ |
| #endif |
| |
| |
| |
| #if defined BB_FEATURE_MOUNT_LOOP |
| #include <fcntl.h> |
| #include <sys/ioctl.h> |
| |
| |
| static int use_loop = FALSE; |
| #endif |
| |
| extern const char mtab_file[]; /* Defined in utility.c */ |
| |
| 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 |
| ; |
| |
| |
| 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}, |
| {"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; |
| char *lofile = NULL; |
| |
| #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; |
| |
| specialfile = find_unused_loop_device(); |
| if (specialfile == NULL) { |
| fprintf(stderr, "Could not find a spare loop device\n"); |
| return (FALSE); |
| } |
| if (set_loop(specialfile, lofile, 0, &loro)) { |
| fprintf(stderr, "Could not setup loop device\n"); |
| return (FALSE); |
| } |
| 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 the mount was sucessful, do anything needed, then return TRUE */ |
| if (status == 0) { |
| |
| #if defined BB_MTAB |
| if (useMtab == TRUE) { |
| 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) { |
| fatalError("mount: permission denied. Are you root?\n"); |
| } |
| |
| return (FALSE); |
| } |
| |
| |
| |
| /* Seperate standard mount options from the nonstandard string options */ |
| static void |
| parse_mount_options(char *options, unsigned long *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 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; |
| } |
| } |
| } |
| |
| 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 |
| |
| 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; |
| |
| /* 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 |
| { |
| status = do_mount(blockDevice, directory, filesystemType, |
| flags | MS_MGC_VAL, string_flags, useMtab, |
| fakeIt, mtab_opts); |
| } |
| |
| if (status == FALSE) { |
| if (whineOnErrors == TRUE) { |
| fprintf(stderr, "Mounting %s on %s failed: %s\n", |
| blockDevice, directory, strerror(errno)); |
| } |
| return (FALSE); |
| } |
| return (TRUE); |
| } |
| |
| extern int mount_main(int argc, char **argv) |
| { |
| 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; |
| int all = FALSE; |
| int fakeIt = FALSE; |
| int useMtab = TRUE; |
| int i; |
| |
| #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); |
| #endif |
| exit(TRUE); |
| } |
| #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(mtab_file); |
| } |
| 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; |
| } |
| } |
| i--; |
| argv++; |
| } |
| |
| if (all == TRUE) { |
| struct mntent *m; |
| FILE *f = setmntent("/etc/fstab", "r"); |
| |
| if (f == NULL) |
| fatalError( "\nCannot read /etc/fstab: %s\n", strerror (errno)); |
| |
| 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"))) { |
| flags = 0; |
| *string_flags = '\0'; |
| parse_mount_options(m->mnt_opts, &flags, string_flags); |
| if (mount_one(m->mnt_fsname, m->mnt_dir, m->mnt_type, |
| flags, string_flags, useMtab, fakeIt, |
| extra_opts, FALSE)==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) { |
| #ifdef BB_NFSMOUNT |
| if (strchr(device, ':') != NULL) |
| filesystemType = "nfs"; |
| if (strcmp(filesystemType, "nfs") == 0) { |
| int ret; |
| ret = nfsmount (device, directory, &flags, |
| &extra_opts, &string_flags, 1); |
| if (ret != 0) |
| fatalError("nfsmount failed: %s\n", strerror(errno)); |
| } |
| #endif |
| exit(mount_one(device, directory, filesystemType, |
| flags, string_flags, useMtab, fakeIt, |
| extra_opts, TRUE)); |
| } else { |
| goto goodbye; |
| } |
| } |
| exit(TRUE); |
| |
| goodbye: |
| usage(mount_usage); |
| } |