X-Git-Url: https://git.librecmc.org/?a=blobdiff_plain;f=mount.c;h=eb6091f30e3763dc7df780b6a820cb59f8ee04fc;hb=95b520110dc1ee6ee670817fdd6312a8565cf34c;hp=4c085d01b2dddf28f97c22f4bdef948b6d08637f;hpb=29d2e362dedf42d60ffebf6756144fb5449e753a;p=oweals%2Fbusybox.git diff --git a/mount.c b/mount.c index 4c085d01b..eb6091f30 100644 --- a/mount.c +++ b/mount.c @@ -1,3 +1,4 @@ +/* vi: set sw=4 ts=4: */ /* * Mini mount implementation for busybox * @@ -24,316 +25,448 @@ * 1999-04-17 Dave Cinege...Rewrote -t auto. Fixed ro mtab. * * 1999-10-07 Erik Andersen , . - * 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 , Borrowed utils-linux's + * mount to add loop support. + * + * 2000-04-30 Dave Cinege + * 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 #include #include #include #include #include #include -#include #include -#include - -extern const char mtab_file[]; /* Defined in utility.c */ - -static 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" -#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" +#include "busybox.h" +#if defined BB_FEATURE_USE_DEVPS_PATCH +# include /* 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 +#include +static int use_loop = FALSE; #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" - "\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"; +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); + +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}, + {"bind", ~0, MS_BIND}, + {0, 0, 0} }; -#if ! defined BB_MTAB -#define do_mount(specialfile, dir, filesystemtype, flags, string_flags, useMtab, fakeIt) \ - mount(specialfile, dir, filesystemtype, flags, string_flags) -#else static int -do_mount(char* specialfile, char* dir, char* filesystemtype, - long flags, void* string_flags, int useMtab, int fakeIt) +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 (fakeIt==FALSE) - status=mount(specialfile, dir, filesystemtype, flags, string_flags); - - if ( status == 0 ) { - if ( useMtab==TRUE ) - write_mtab(specialfile, dir, filesystemtype, flags, string_flags); - return 0; - } - else - return( status); -} + 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; + + lofile = specialfile; -/* 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++; + 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 (status < 0 && errno == EROFS) { + 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 (*strflags && strflags!= '\0' && gotone==FALSE) { - char *temp=strflags; - temp += strlen (strflags); - *temp++ = ','; - *temp++ = '\0'; + + + /* If the mount was sucessful, do anything needed, then return TRUE */ + if (status == 0 || fakeIt==TRUE) { + +#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 + return (TRUE); } - if (gotone==FALSE) { - strcat (strflags, options); - gotone=FALSE; + + /* Bummer. mount failed. Clean up */ +#if defined BB_FEATURE_MOUNT_LOOP + if (lofile != NULL) { + del_loop(specialfile); } - if (comma) { - *comma = ','; - options = ++comma; - } else { - break; +#endif + + if (errno == EPERM) { + error_msg_and_die("permission denied. Are you root?"); } - } + + return (FALSE); } -int -mount_one(char *blockDevice, char *directory, char *filesystemType, - unsigned long flags, char *string_flags, int useMtab, int fakeIt) + + +/* Seperate standard mount options from the nonstandard string options */ +static void +parse_mount_options(char *options, int *flags, char *strflags) { - int status = 0; + while (options) { + int gotone = FALSE; + char *comma = strchr(options, ','); + const struct mount_options *f = mount_options; - char buf[255]; + if (comma) + *comma = '\0'; - if (strcmp(filesystemType, "auto") == 0) { - FILE *f = fopen ("/proc/filesystems", "r"); + while (f->name != 0) { + if (strcasecmp(f->name, options) == 0) { - if (f == NULL) - return( FALSE); + *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; - while (fgets (buf, sizeof (buf), f) != NULL) { - filesystemType = buf; - if (*filesystemType == '\t') { // Not a nodev filesystem + temp += strlen(strflags); + *temp++ = ','; + *temp++ = '\0'; + } + if (gotone == FALSE) + strcat(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; - // Add NULL termination to each line - while (*filesystemType && *filesystemType != '\n') - filesystemType++; - *filesystemType = '\0'; + if (strcmp(filesystemType, "auto") == 0) { + 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; - filesystemType++; // hop past tab + filesystemType=buf; - status = do_mount (blockDevice, directory, filesystemType, - flags | MS_MGC_VAL, string_flags, useMtab, fakeIt); - if (status == 0) - break; - } + 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, mount_all); + if (status == TRUE) + break; + } + } + } else { + status = do_mount(blockDevice, directory, filesystemType, + flags | MS_MGC_VAL, string_flags, useMtab, + fakeIt, mtab_opts, mount_all); } - fclose (f); - } else { - status = do_mount (blockDevice, directory, filesystemType, - flags | MS_MGC_VAL, string_flags, useMtab, fakeIt); - } - - 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) +void show_mounts() { - char string_flags[1024]=""; - unsigned long flags = 0; - char *filesystemType = "auto"; - char *device = NULL; - char *directory = NULL; - int all = FALSE; - int fakeIt = FALSE; - int useMtab = TRUE; - int i; - - /* Only compiled in if BB_MTAB is not defined */ - whine_if_fstab_is_missing(); - - if (argc == 1) { - FILE *mountTable = setmntent (mtab_file, "r"); +#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) { - struct fstab* fstabItem; - char *blockDevice = m->mnt_fsname; - /* Note that if /etc/fstab is missing, libc can't fix up /dev/root for us */ - if (strcmp (blockDevice, "/dev/root") == 0) { - fstabItem = getfsfile ("/"); - if (fstabItem != NULL) - blockDevice = fstabItem->fs_spec; + 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 } - printf ("%s on %s type %s (%s)\n", blockDevice, m->mnt_dir, - m->mnt_type, m->mnt_opts); - } - endmntent (mountTable); + endmntent(mountTable); } else { - perror(mtab_file); + perror_msg_and_die("%s", mtab_file); } - exit( TRUE); - } - - - /* Parse options */ - i = --argc; - argv++; - while (i > 0 && **argv) { - if (**argv == '-') { - while (i>0 && *++(*argv)) switch (**argv) { - case 'o': - if (--i == 0) { - fprintf (stderr, "%s\n", mount_usage); - exit( FALSE); - } - 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); - } - filesystemType = *(++argv); - --i; - ++argv; - break; - case 'w': - flags &= ~MS_RDONLY; - break; - case 'a': - all = TRUE; - break; -#ifdef BB_MTAB - case 'f': - fakeIt = TRUE; - break; - case 'n': - useMtab = FALSE; - break; + exit(EXIT_SUCCESS); #endif - case 'v': - case 'h': - case '-': - fprintf (stderr, "%s\n", mount_usage); - exit( TRUE); - break; - } - } else { - if (device == NULL) - device=*argv; - else if (directory == NULL) - directory=*argv; - else { - fprintf (stderr, "%s\n", mount_usage); - exit( TRUE); - } +} + +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; + int flags = 0; + char *filesystemType = "auto"; + char *device = xmalloc(PATH_MAX); + char *directory = xmalloc(PATH_MAX); + int all = FALSE; + int fakeIt = FALSE; + int useMtab = TRUE; + int rc = EXIT_FAILURE; + int fstabmount = FALSE; + 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; + 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 + case 'v': + break; /* ignore -v */ + } } - i--; - argv++; - } - if (all == TRUE) { - struct mntent *m; - FILE *f = setmntent ("/etc/fstab", "r"); + if (!all && optind == argc) + show_mounts(); - if (f == NULL) { - perror("/etc/fstab"); - exit( FALSE); + if (optind < argc) { + /* if device is a filename get its real path */ + if (stat(argv[optind], &statbuf) == 0) { + realpath(argv[optind], device); + } else { + safe_strncpy(device, argv[optind], PATH_MAX); + } } - while ((m = getmntent (f)) != NULL) { - // If the file system isn't noauto, and isn't mounted on /, - // and isn't swap or nfs, then mount it - if ((!strstr (m->mnt_opts, "noauto")) && - (m->mnt_dir[1] != '\0') && - (!strstr (m->mnt_type, "swap")) && - (!strstr (m->mnt_type, "nfs"))) - { - flags = 0; - *string_flags = '\0'; - 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); - } + + if (optind + 1 < argc) { + if (realpath(argv[optind + 1], directory) == NULL) { + perror_msg_and_die("%s", directory); + } } - endmntent (f); - } else { - if (device && directory) { - exit (mount_one (device, directory, filesystemType, - flags, string_flags, useMtab, fakeIt)); - } else { - fprintf (stderr, "%s\n", mount_usage); - exit( FALSE); + + if (all == TRUE || optind + 1 == argc) { + struct mntent *m = NULL; + FILE *f = setmntent("/etc/fstab", "r"); + fstabmount = TRUE; + + if (f == NULL) + perror_msg_and_die( "\nCannot read /etc/fstab"); + + while ((m = getmntent(f)) != NULL) { + 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); + } + + 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)) { + 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 == 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); + + goto singlemount; }