+/* vi: set sw=4 ts=4: */
/*
- 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.
-*/
+ * 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 <mntent.h>
#include <sys/mount.h>
#include <ctype.h>
+#include <fstab.h>
+
+#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 */
+
+static const char mount_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"
+#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"
+#if defined BB_FEATURE_MOUNT_LOOP
+ "\tloop: Mounts a file via loop device.\n"
+#endif
+ "\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";
-const char mount_usage[] = "mount\n"
-"\t\tmount [flags] special-device directory\n"
-"\n"
-"Flags:\n"
-"\t-a:\tMount all file systems in fstab.\n"
-"\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"
-"\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";
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 }
+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}
};
-static void
-show_flags(unsigned long flags, char * buffer)
+static int
+do_mount(char *specialfile, char *dir, char *filesystemtype,
+ long flags, void *string_flags, int useMtab, int fakeIt,
+ char *mtab_opts)
{
- const struct mount_options * f = mount_options;
- while ( f->name ) {
- if ( flags & f->and ) {
- int length = strlen(f->name);
- memcpy(buffer, f->name, length);
- buffer += length;
- *buffer++ = ',';
- *buffer = '\0';
+ 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;
+ }
+ use_loop = FALSE;
}
- f++;
+#endif
+ status =
+ mount(specialfile, dir, filesystemtype, flags, string_flags);
}
-}
-static void
-one_option(
- char * option
-,unsigned long * flags
-,char * data)
-{
- const struct mount_options * f = mount_options;
- while ( f->name != 0 ) {
- if ( strcasecmp(f->name, option) == 0 ) {
- *flags &= f->and;
- *flags |= f->or;
- return;
+ /* 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);
}
- f++;
+#endif
+ return (TRUE);
}
- if ( *data ) {
- data += strlen(data);
- *data++ = ',';
+
+ /* Bummer. mount failed. Clean up */
+#if defined BB_FEATURE_MOUNT_LOOP
+ if (lofile != NULL) {
+ del_loop(specialfile);
}
- strcpy(data, option);
+#endif
+ 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, unsigned long *flags, char *strflags)
{
- while ( *options ) {
- char * comma = strchr(options, ',');
- if ( comma )
+ while (options) {
+ int gotone = FALSE;
+ char *comma = strchr(options, ',');
+ const struct mount_options *f = mount_options;
+
+ if (comma)
*comma = '\0';
- one_option(options, flags, data);
- if ( comma ) {
+
+ 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
+ } else {
break;
+ }
}
}
int
-mount_one(
- char * blockDevice
-,char * directory
-,char * filesystemType
-,unsigned long flags
-,char * string_flags
-,int noMtab
-,int fake)
+mount_one(char *blockDevice, char *directory, char *filesystemType,
+ unsigned long flags, char *string_flags, int useMtab, int fakeIt,
+ char *mtab_opts, int whineOnErrors)
{
- int error = 0;
- int status = 0;
+ int status = 0;
- char buf[255];
-
- if (!fake) {
- if (*filesystemType == 'a') { //Will fail on real FS starting with 'a'
+ char buf[255];
- FILE *f = fopen("/proc/filesystems", "r");
-
- if (f == NULL) return 1;
-
- while (fgets(buf, sizeof(buf), f) != NULL) {
- filesystemType = buf;
- if (*filesystemType == '\t') { // Not a nodev filesystem
-
- while (*filesystemType && *filesystemType != '\n') filesystemType++;
- *filesystemType = '\0';
-
- filesystemType = buf;
- filesystemType++; //hop past tab
-
- status = mount(blockDevice, directory, filesystemType,
- flags|MS_MGC_VAL ,string_flags);
- error = errno;
-
- if (status == 0) break;
- }
- }
- fclose(f);
- } else {
+#if defined BB_FEATURE_USE_PROCFS
+ if (strcmp(filesystemType, "auto") == 0) {
+ FILE *f = fopen("/proc/filesystems", "r");
- status = mount( blockDevice, directory, filesystemType,
- flags|MS_MGC_VAL ,string_flags);
- error = errno;
- }
- }
+ if (f == NULL)
+ return (FALSE);
- if ( status == 0 ) {
- char * s = &string_flags[strlen(string_flags)];
- FILE * mountTable;
- if ( s != string_flags ) {
- *s++ = ',';
- show_flags(flags, s);
- }
- if ( !noMtab && (mountTable = setmntent("/etc/mtab", "a+")) ) {
- int length = strlen(directory);
- struct mntent m;
+ while (fgets(buf, sizeof(buf), f) != NULL) {
+ filesystemType = buf;
+ if (*filesystemType == '\t') { // Not a nodev filesystem
- if ( length > 1 && directory[length - 1] == '/' )
- directory[length - 1] = '\0';
+ // Add NULL termination to each line
+ while (*filesystemType && *filesystemType != '\n')
+ filesystemType++;
+ *filesystemType = '\0';
- if ( filesystemType == 0 ) {
- struct mntent * p
- = findMountPoint(blockDevice, "/proc/mounts");
+ filesystemType = buf;
+ filesystemType++; // hop past tab
- if ( p && p->mnt_type )
- filesystemType = p->mnt_type;
+ status = do_mount(blockDevice, directory, filesystemType,
+ flags | MS_MGC_VAL, string_flags,
+ useMtab, fakeIt, mtab_opts);
+ if (status == TRUE)
+ break;
}
- m.mnt_fsname = blockDevice;
- m.mnt_dir = directory;
- m.mnt_type = filesystemType ? filesystemType : "default";
-
- if (*string_flags) {
- m.mnt_opts = string_flags;
- } else {
- if ( (flags | MS_RDONLY) == flags )
- m.mnt_opts = "ro";
- else
- m.mnt_opts = "rw";
- }
-
- m.mnt_freq = 0;
- m.mnt_passno = 0;
- addmntent(mountTable, &m);
- endmntent(mountTable);
}
- return 0;
- } else {
- fprintf(stderr, "Mount %s", blockDevice);
- if ( filesystemType && *filesystemType )
- fprintf(stderr, " (type %s)", filesystemType);
-
- fprintf(
- stderr
- ," on %s: "
- ,directory);
-
- switch ( error ) {
- case EPERM:
- if (geteuid() == 0)
- fprintf(
- stderr
- ,"mount point %s is not a directory"
- ,blockDevice);
- else
- fprintf(
- stderr
- ,"must be superuser to use mount");
- break;
- case EBUSY:
- fprintf(
- stderr
- ,"%s already mounted or %s busy"
- ,blockDevice
- ,directory);
- break;
- case ENOENT:
- {
- struct stat statbuf;
- if ( stat(directory, &statbuf) != 0 )
- fprintf(
- stderr
- ,"directory %s does not exist"
- ,directory);
- else if ( stat(blockDevice, &statbuf) != 0 )
- fprintf(
- stderr
- ,"block device %s does not exist"
- ,blockDevice);
- else
- fprintf(
- stderr
- ,"%s is not mounted on %s, but the mount table says it is."
- ,blockDevice
- ,directory);
- break;
- }
- case ENOTDIR:
- fprintf(
- stderr
- ,"%s is not a directory"
- ,directory);
- break;
- case EINVAL:
- fprintf(
- stderr
- ,"wrong filesystem type, or bad superblock on %s"
- ,blockDevice);
- break;
- case EMFILE:
- fprintf(stderr, "mount table full");
- break;
- case EIO:
- fprintf(
- stderr
- ,"I/O error reading %s"
- ,blockDevice);
- break;
- case ENODEV:
- {
- FILE * f = fopen("/proc/filesystems", "r");
-
- fprintf(
- stderr
- ,"filesystem type %s not in kernel.\n"
- ,filesystemType);
- fprintf(stderr, "Do you need to load a module?\n");
- if ( f ) {
- char buf[100];
-
- fprintf(
- stderr
- ,"Here are the filesystem types the kernel"
- " can mount:\n");
- while ( fgets(buf, sizeof(buf), f) != 0 )
- fprintf(stderr, "\t%s", buf);
- fclose(f);
- }
- break;
- }
- case ENOTBLK:
- fprintf(
- stderr
- ,"%s is not a block device"
- ,blockDevice);
- break;
- case ENXIO:
- fprintf(
- stderr
- ,"%s is not a valid block device"
- ,blockDevice);
- break;
- default:
- fputs(strerror(errno), stderr);
+ fclose(f);
+ } else
+#endif
+ {
+ status = do_mount(blockDevice, directory, filesystemType,
+ flags | MS_MGC_VAL, string_flags, useMtab,
+ fakeIt, mtab_opts);
+ }
+
+ if (status == FALSE && whineOnErrors == TRUE) {
+ if (whineOnErrors == TRUE) {
+ fprintf(stderr, "Mounting %s on %s failed: %s\n",
+ blockDevice, directory, strerror(errno));
}
- putc('\n', stderr);
- return -1;
+ return (FALSE);
}
+ return (TRUE);
}
-extern int
-mount_main(struct FileInfo * i, int argc, char * * argv)
+extern int mount_main(int argc, char **argv)
{
- char string_flags[1024];
- unsigned long flags = 0;
- char * filesystemType = "auto";
- int fake = 0;
- int noMtab = 0;
- int all = 0;
-
- *string_flags = '\0';
-
- if ( argc == 1 ) {
- FILE * mountTable;
- if ( (mountTable = setmntent("/etc/mtab", "r")) ) {
- struct mntent * m;
- while ( (m = getmntent(mountTable)) != 0 ) {
- printf(
- "%s on %s type %s (%s)\n"
- ,m->mnt_fsname
- ,m->mnt_dir
- ,m->mnt_type
- ,m->mnt_opts);
+ 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;
+
+ /* Only compiled in if BB_MTAB is not defined */
+ whine_if_fstab_is_missing();
+
+ if (argc == 1) {
+ 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;
+ }
+ printf("%s on %s type %s (%s)\n", blockDevice, m->mnt_dir,
+ m->mnt_type, m->mnt_opts);
}
endmntent(mountTable);
+ } else {
+ perror(mtab_file);
}
- return 0;
+ exit(TRUE);
}
- while ( argc >= 2 && argv[1][0] == '-' ) {
- switch ( argv[1][1] ) {
- case 'f':
- fake = 1;
- break;
- case 'n':
- noMtab = 1;
- break;
- case 'o':
- if ( argc < 3 ) {
- usage(mount_usage);
- return 1;
- }
- parse_mount_options(argv[2], &flags, string_flags);
- argc--;
- argv++;
- break;
- case 'r':
- flags |= MS_RDONLY;
- break;
- case 't':
- if ( argc < 3 ) {
- usage(mount_usage);
- return 1;
+
+ /* 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;
+#ifdef BB_MTAB
+ case 'f':
+ fakeIt = TRUE;
+ break;
+ case 'n':
+ useMtab = FALSE;
+ break;
+#endif
+ case 'v':
+ case 'h':
+ case '-':
+ goto goodbye;
+ }
+ } else {
+ if (device == NULL)
+ device = *argv;
+ else if (directory == NULL)
+ directory = *argv;
+ else {
+ goto goodbye;
}
- filesystemType = argv[2];
- argc--;
- argv++;
- break;
- case 'v':
- break;
- case 'w':
- flags &= ~MS_RDONLY;
- break;
- case 'a':
- all = 1;
- break;
- default:
- usage(mount_usage);
- return 1;
}
- argc--;
+ i--;
argv++;
}
- if (all == 1) {
- struct mntent *m;
- FILE *f = setmntent("/etc/fstab", "r");
+ if (all == TRUE) {
+ struct mntent *m;
+ FILE *f = setmntent("/etc/fstab", "r");
- if (f == NULL) {
- return 1;
+ if (f == NULL) {
+ perror("/etc/fstab");
+ exit(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, noMtab, fake);
+ while ((m = getmntent(f)) != NULL) {
+ // If the file system 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 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 ( argc >= 3 ) {
- if ( mount_one( argv[1], argv[2], filesystemType, flags, string_flags, noMtab, fake) == 0 )
- return 0;
- else
- return 1;
+ if (device && directory) {
+#ifdef BB_NFSMOUNT
+ if (strcmp(filesystemType, "nfs") == 0) {
+ if (nfsmount
+ (device, directory, &flags, &extra_opts, &string_flags,
+ 1) != 0)
+ exit(FALSE);
+ }
+#endif
+ exit(mount_one(device, directory, filesystemType,
+ flags, string_flags, useMtab, fakeIt,
+ extra_opts, TRUE));
} else {
- usage(mount_usage);
- return 1;
+ goto goodbye;
}
}
- return 0;
+ exit(TRUE);
+
+ goodbye:
+ usage(mount_usage);
}
projects / oweals / busybox.git / blobdiff