* 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>
+ * Copyright (C) 2005-2006 by Rob Landley <rob@landley.net>
*
- * 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.
- *
- * 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.
- *
+ * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
*/
-#include <stdlib.h>
-#include <unistd.h>
-#include <errno.h>
-#include <string.h>
-#include <stdio.h>
-#include <mntent.h>
-#include <ctype.h>
-#if defined BB_FEATURE_USE_DEVPS_PATCH
-#include <linux/devmtab.h> /* For Erik's nifty devmtab device driver */
-#endif
-#include "busybox.h"
-
-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 */
-};
+/* todo:
+ * bb_getopt_ulflags();
+ */
+/* Design notes: There is no spec for mount. Remind me to write one.
-#if defined BB_FEATURE_MOUNT_LOOP
-#include <fcntl.h>
-#include <sys/ioctl.h>
-static int use_loop = FALSE;
-#endif
+ mount_main() calls singlemount() which calls mount_it_now().
-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);
+ mount_main() can loop through /etc/fstab for mount -a
+ singlemount() can loop through /etc/filesystems for fstype detection.
+ mount_it_now() does the actual mount.
+*/
-#include <sys/syscall.h>
-#include <linux/unistd.h>
-static int sysfs( int option, unsigned int fs_index, char * buf);
-_syscall3(int, sysfs, int, option, unsigned int, fs_index, char *, buf);
+#include "busybox.h"
+#include <mntent.h>
+// Not real flags, but we want to be able to check for this.
+#define MOUNT_NOAUTO (1<<29)
+#define MOUNT_SWAP (1<<30)
+
+/* Standard mount options (from -o options or --options), with corresponding
+ * flags */
+
+struct {
+ char *name;
+ long flags;
+} static mount_options[] = {
+ // MS_FLAGS set a bit. ~MS_FLAGS disable that bit. 0 flags are NOPs.
+
+ USE_FEATURE_MOUNT_LOOP(
+ {"loop", 0},
+ )
+
+ USE_FEATURE_MOUNT_FSTAB(
+ {"defaults", 0},
+ {"quiet", 0},
+ {"noauto",MOUNT_NOAUTO},
+ {"swap",MOUNT_SWAP},
+ )
+
+ USE_FEATURE_MOUNT_FLAGS(
+ // vfs flags
+ {"nosuid", MS_NOSUID},
+ {"suid", ~MS_NOSUID},
+ {"dev", ~MS_NODEV},
+ {"nodev", MS_NODEV},
+ {"exec", ~MS_NOEXEC},
+ {"noexec", MS_NOEXEC},
+ {"sync", MS_SYNCHRONOUS},
+ {"async", ~MS_SYNCHRONOUS},
+ {"atime", ~MS_NOATIME},
+ {"noatime", MS_NOATIME},
+ {"diratime", ~MS_NODIRATIME},
+ {"nodiratime", MS_NODIRATIME},
+ {"loud", ~MS_SILENT},
+
+ // action flags
+
+ {"bind", MS_BIND},
+ {"move", MS_MOVE},
+ {"shared", MS_SHARED},
+ {"slave", MS_SLAVE},
+ {"private", MS_PRIVATE},
+ {"unbindable", MS_UNBINDABLE},
+ {"rshared", MS_SHARED|MS_RECURSIVE},
+ {"rslave", MS_SLAVE|MS_RECURSIVE},
+ {"rprivate", MS_SLAVE|MS_RECURSIVE},
+ {"runbindable", MS_UNBINDABLE|MS_RECURSIVE},
+ )
+
+ // Always understood.
+
+ {"ro", MS_RDONLY}, // vfs flag
+ {"rw", ~MS_RDONLY}, // vfs flag
+ {"remount", MS_REMOUNT}, // action flag
-extern const char mtab_file[]; /* Defined in utility.c */
-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}
-};
+/* Append mount options to string */
+static void append_mount_options(char **oldopts, char *newopts)
+{
+ if(*oldopts && **oldopts) {
+ char *temp = xasprintf("%s,%s",*oldopts,newopts);
+ free(*oldopts);
+ *oldopts = temp;
+ } else {
+ if (ENABLE_FEATURE_CLEAN_UP) free(*oldopts);
+ *oldopts = xstrdup(newopts);
+ }
+}
-static int
-do_mount(char *specialfile, char *dir, char *filesystemtype,
- long flags, void *string_flags, int useMtab, int fakeIt,
- char *mtab_opts)
+/* Use the mount_options list to parse options into flags.
+ * Also return list of unrecognized options if unrecognized!=NULL */
+static int parse_mount_options(char *options, char **unrecognized)
{
- int status = 0;
-#if defined BB_FEATURE_MOUNT_LOOP
- char *lofile = NULL;
-#endif
+ int flags = MS_SILENT;
- if (fakeIt == FALSE)
- {
-#if defined BB_FEATURE_MOUNT_LOOP
- if (use_loop==TRUE) {
- int loro = flags & MS_RDONLY;
-
- 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;
+ // Loop through options
+ for (;;) {
+ int i;
+ char *comma = strchr(options, ',');
+
+ if (comma) *comma = 0;
+
+ // Find this option in mount_options
+ for (i = 0; i < (sizeof(mount_options) / sizeof(*mount_options)); i++) {
+ if (!strcasecmp(mount_options[i].name, options)) {
+ long fl = mount_options[i].flags;
+ if(fl < 0) flags &= fl;
+ else flags |= fl;
+ break;
}
}
-#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 unrecognized not NULL, append unrecognized mount options */
+ if (unrecognized
+ && i == (sizeof(mount_options) / sizeof(*mount_options)))
+ {
+ // Add it to strflags, to pass on to kernel
+ i = *unrecognized ? strlen(*unrecognized) : 0;
+ *unrecognized = xrealloc(*unrecognized, i+strlen(options)+2);
+
+ // Comma separated if it's not the first one
+ if (i) (*unrecognized)[i++] = ',';
+ strcpy((*unrecognized)+i, options);
}
+
+ // Advance to next option, or finish
+ if(comma) {
+ *comma = ',';
+ options = ++comma;
+ } else break;
}
+ return flags;
+}
- /* If the mount was sucessful, do anything needed, then return TRUE */
- if (status == 0 || fakeIt==TRUE) {
+// Return a list of all block device backed filesystems
-#if defined BB_MTAB
- if (useMtab == TRUE) {
- erase_mtab(specialfile); // Clean any stale entries
- write_mtab(specialfile, dir, filesystemtype, flags, mtab_opts);
+static llist_t *get_block_backed_filesystems(void)
+{
+ char *fs, *buf,
+ *filesystems[] = {"/etc/filesystems", "/proc/filesystems", 0};
+ llist_t *list = 0;
+ int i;
+ FILE *f;
+
+ for(i = 0; filesystems[i]; i++) {
+ if(!(f = fopen(filesystems[i], "r"))) continue;
+
+ for(fs = buf = 0; (fs = buf = bb_get_chomped_line_from_file(f));
+ free(buf))
+ {
+ if(!strncmp(buf,"nodev",5) && isspace(buf[5])) continue;
+
+ while(isspace(*fs)) fs++;
+ if(*fs=='#' || *fs=='*') continue;
+ if(!*fs) continue;
+
+ llist_add_to_end(&list,xstrdup(fs));
}
-#endif
- return (TRUE);
+ if (ENABLE_FEATURE_CLEAN_UP) fclose(f);
}
- /* Bummer. mount failed. Clean up */
-#if defined BB_FEATURE_MOUNT_LOOP
- if (lofile != NULL) {
- del_loop(specialfile);
- }
+ return list;
+}
+
+llist_t *fslist = 0;
+
+#if ENABLE_FEATURE_CLEAN_UP
+static void delete_block_backed_filesystems(void)
+{
+ llist_free(fslist, free);
+}
+#else
+void delete_block_backed_filesystems(void);
+#endif
+
+#if ENABLE_FEATURE_MTAB_SUPPORT
+static int useMtab = 1;
+static int fakeIt;
+#else
+#define useMtab 0
+#define fakeIt 0
#endif
- if (errno == EPERM) {
- error_msg_and_die("permission denied. Are you root?");
+// Perform actual mount of specific filesystem at specific location.
+int mount_it_now(struct mntent *mp, int vfsflags, char *filteropts)
+{
+ int rc;
+
+ if (fakeIt) { return 0; }
+
+ // Mount, with fallback to read-only if necessary.
+
+ for(;;) {
+ rc = mount(mp->mnt_fsname, mp->mnt_dir, mp->mnt_type,
+ vfsflags, filteropts);
+ if(!rc || (vfsflags&MS_RDONLY) || (errno!=EACCES && errno!=EROFS))
+ break;
+ bb_error_msg("%s is write-protected, mounting read-only",
+ mp->mnt_fsname);
+ vfsflags |= MS_RDONLY;
}
- return (FALSE);
-}
+ // Abort entirely if permission denied.
+ if (rc && errno == EPERM)
+ bb_error_msg_and_die(bb_msg_perm_denied_are_you_root);
+ /* If the mount was successful, and we're maintaining an old-style
+ * mtab file by hand, add the new entry to it now. */
-/* 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(ENABLE_FEATURE_MTAB_SUPPORT && useMtab && !rc) {
+ FILE *mountTable = setmntent(bb_path_mtab_file, "a+");
+ int i;
- if (comma)
- *comma = '\0';
+ if(!mountTable)
+ bb_error_msg("no %s",bb_path_mtab_file);
- while (f->name != 0) {
- if (strcasecmp(f->name, options) == 0) {
+ // Add vfs string flags
- *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;
+ for(i=0; mount_options[i].flags != MS_REMOUNT; i++)
+ if (mount_options[i].flags > 0)
+ append_mount_options(&(mp->mnt_opts), mount_options[i].name);
- temp += strlen(strflags);
- *temp++ = ',';
- *temp++ = '\0';
- }
- if (gotone == FALSE)
- strcat(strflags, options);
- if (comma) {
- *comma = ',';
- options = ++comma;
- } else {
- break;
- }
+ // Remove trailing / (if any) from directory we mounted on
+
+ i = strlen(mp->mnt_dir);
+ if(i>1 && mp->mnt_dir[i-1] == '/') mp->mnt_dir[i-1] = 0;
+
+ // Write and close.
+
+ if(!mp->mnt_type || !*mp->mnt_type) mp->mnt_type="--bind";
+// addmntent(mountTable, mp);
+if(0) bb_error_msg("buggy: addmntent(fsname='%s' dir='%s' type='%s' opts='%s')",
+mp->mnt_fsname,
+mp->mnt_dir,
+mp->mnt_type,
+mp->mnt_opts
+);
+ endmntent(mountTable);
+ if (ENABLE_FEATURE_CLEAN_UP)
+ if(strcmp(mp->mnt_type,"--bind")) mp->mnt_type = 0;
}
+
+ return rc;
}
-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)
+// Mount one directory. Handles CIFS, NFS, loopback, autobind, and filesystem
+// type detection. Returns 0 for success, nonzero for failure.
+
+static int singlemount(struct mntent *mp, int ignore_busy)
{
- int status = 0;
+ int rc = -1, vfsflags;
+ char *loopFile = 0, *filteropts = 0;
+ llist_t *fl = 0;
+ struct stat st;
- if (strcmp(filesystemType, "auto") == 0) {
- static const char *strings[] = { "tmpfs", "shm", "proc", "ramfs", "devpts", 0 };
- const char** nodevfss;
- const int num_of_filesystems = sysfs(3, 0, 0);
- char buf[255];
- int i=0;
+ vfsflags = parse_mount_options(mp->mnt_opts, &filteropts);
- filesystemType=buf;
+ // Treat fstype "auto" as unspecified.
- while(i < num_of_filesystems) {
- sysfs(2, i++, filesystemType);
- for (nodevfss = strings; *nodevfss; nodevfss++) {
- if (!strcmp(filesystemType, *nodevfss)) {
- break;
- }
- }
- if (!*nodevfss) {
- status = do_mount(blockDevice, directory, filesystemType,
- flags | MS_MGC_VAL, string_flags,
- useMtab, fakeIt, mtab_opts);
- if (status == TRUE)
+ if (mp->mnt_type && !strcmp(mp->mnt_type,"auto")) mp->mnt_type = 0;
+
+ // Might this be an CIFS filesystem?
+
+ if(ENABLE_FEATURE_MOUNT_CIFS &&
+ (!mp->mnt_type || !strcmp(mp->mnt_type,"cifs")) &&
+ (mp->mnt_fsname[0]==mp->mnt_fsname[1] && (mp->mnt_fsname[0]=='/' || mp->mnt_fsname[0]=='\\')))
+ {
+ struct hostent *he;
+ char ip[32], *s;
+
+ rc = 1;
+ // Replace '/' with '\' and verify that unc points to "//server/share".
+
+ for (s = mp->mnt_fsname; *s; ++s)
+ if (*s == '/') *s = '\\';
+
+ // get server IP
+
+ s = strrchr(mp->mnt_fsname, '\\');
+ if (s == mp->mnt_fsname+1) goto report_error;
+ *s = 0;
+ he = gethostbyname(mp->mnt_fsname+2);
+ *s = '\\';
+ if (!he) goto report_error;
+
+ // Insert ip=... option into string flags. (NOTE: Add IPv6 support.)
+
+ sprintf(ip, "ip=%d.%d.%d.%d", he->h_addr[0], he->h_addr[1],
+ he->h_addr[2], he->h_addr[3]);
+ parse_mount_options(ip, &filteropts);
+
+ // compose new unc '\\server-ip\share'
+
+ s = xasprintf("\\\\%s%s",ip+3,strchr(mp->mnt_fsname+2,'\\'));
+ if (ENABLE_FEATURE_CLEAN_UP) free(mp->mnt_fsname);
+ mp->mnt_fsname = s;
+
+ // lock is required
+ vfsflags |= MS_MANDLOCK;
+
+ mp->mnt_type = "cifs";
+ rc = mount_it_now(mp, vfsflags, filteropts);
+ goto report_error;
+ }
+
+ // Might this be an NFS filesystem?
+
+ if (ENABLE_FEATURE_MOUNT_NFS &&
+ (!mp->mnt_type || !strcmp(mp->mnt_type,"nfs")) &&
+ strchr(mp->mnt_fsname, ':') != NULL)
+ {
+ rc = nfsmount(mp, vfsflags, filteropts);
+ goto report_error;
+ }
+
+ // Look at the file. (Not found isn't a failure for remount, or for
+ // a synthetic filesystem like proc or sysfs.)
+
+ if (!lstat(mp->mnt_fsname, &st) && !(vfsflags & (MS_REMOUNT | MS_BIND | MS_MOVE)))
+ {
+ // Do we need to allocate a loopback device for it?
+
+ if (ENABLE_FEATURE_MOUNT_LOOP && S_ISREG(st.st_mode)) {
+ loopFile = bb_simplify_path(mp->mnt_fsname);
+ mp->mnt_fsname = 0;
+ switch(set_loop(&(mp->mnt_fsname), loopFile, 0)) {
+ case 0:
+ case 1:
break;
+ default:
+ bb_error_msg( errno == EPERM || errno == EACCES
+ ? bb_msg_perm_denied_are_you_root
+ : "cannot setup loop device");
+ return errno;
}
+
+ // Autodetect bind mounts
+
+ } else if (S_ISDIR(st.st_mode) && !mp->mnt_type)
+ vfsflags |= MS_BIND;
+ }
+
+ /* If we know the fstype (or don't need to), jump straight
+ * to the actual mount. */
+
+ if (mp->mnt_type || (vfsflags & (MS_REMOUNT | MS_BIND | MS_MOVE)))
+ rc = mount_it_now(mp, vfsflags, filteropts);
+
+ // Loop through filesystem types until mount succeeds or we run out
+
+ else {
+
+ /* Initialize list of block backed filesystems. This has to be
+ * done here so that during "mount -a", mounts after /proc shows up
+ * can autodetect. */
+
+ if (!fslist) {
+ fslist = get_block_backed_filesystems();
+ if (ENABLE_FEATURE_CLEAN_UP && fslist)
+ atexit(delete_block_backed_filesystems);
+ }
+
+ for (fl = fslist; fl; fl = fl->link) {
+ mp->mnt_type = fl->data;
+
+ if (!(rc = mount_it_now(mp,vfsflags, filteropts))) break;
+
+ mp->mnt_type = 0;
}
- } else {
- status = do_mount(blockDevice, directory, filesystemType,
- flags | MS_MGC_VAL, string_flags, useMtab,
- fakeIt, mtab_opts);
}
- if (status == FALSE) {
- if (whineOnErrors == TRUE) {
- perror_msg("Mounting %s on %s failed", blockDevice, directory);
+ // If mount failed, clean up loop file (if any).
+
+ if (ENABLE_FEATURE_MOUNT_LOOP && rc && loopFile) {
+ del_loop(mp->mnt_fsname);
+ if (ENABLE_FEATURE_CLEAN_UP) {
+ free(loopFile);
+ free(mp->mnt_fsname);
}
- return (FALSE);
}
- return (TRUE);
+
+report_error:
+ if (ENABLE_FEATURE_CLEAN_UP) free(filteropts);
+
+ if (rc && errno == EBUSY && ignore_busy) rc = 0;
+ if (rc < 0)
+ /* perror here sometimes says "mounting ... on ... failed: Success" */
+ bb_error_msg("mounting %s on %s failed", mp->mnt_fsname, mp->mnt_dir);
+
+ return rc;
}
-extern int mount_main(int argc, char **argv)
+// Parse options, if necessary parse fstab/mtab, and call singlemount for
+// each directory to be mounted.
+
+int mount_main(int argc, char **argv)
{
- 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;
+ char *cmdopts = xstrdup(""), *fstabname, *fstype=0, *storage_path=0;
+ FILE *fstab;
+ int i, opt, all = FALSE, rc = 0;
+ struct mntent mtpair[2], *mtcur = mtpair;
+
+ /* parse long options, like --bind and --move. Note that -o option
+ * and --option are synonymous. Yes, this means --remount,rw works. */
+
+ for (i = opt = 0; i < argc; i++) {
+ if (argv[i][0] == '-' && argv[i][1] == '-') {
+ append_mount_options(&cmdopts,argv[i]+2);
+ } else argv[opt++] = argv[i];
}
-#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);
+ argc = opt;
+
+ // Parse remaining options
+
+ while ((opt = getopt(argc, argv, "o:t:rwavnf")) > 0) {
+ switch (opt) {
+ case 'o':
+ append_mount_options(&cmdopts, optarg);
+ break;
+ case 't':
+ fstype = optarg;
+ break;
+ case 'r':
+ append_mount_options(&cmdopts, "ro");
+ break;
+ case 'w':
+ append_mount_options(&cmdopts, "rw");
+ break;
+ case 'a':
+ all = TRUE;
+ break;
+ case 'n':
+ USE_FEATURE_MTAB_SUPPORT(useMtab = FALSE;)
+ break;
+ case 'f':
+ USE_FEATURE_MTAB_SUPPORT(fakeIt = FALSE;)
+ break;
+ case 'v':
+ break; // ignore -v
+ default:
+ bb_show_usage();
}
- 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;
+ // Three or more non-option arguments? Die with a usage message.
+
+ if (optind-argc>2) bb_show_usage();
+
+ // If we have no arguments, show currently mounted filesystems
+
+ if (optind == argc) {
+ if (!all) {
+ FILE *mountTable = setmntent(bb_path_mtab_file, "r");
+
+ if(!mountTable) bb_error_msg_and_die("no %s",bb_path_mtab_file);
+
+ while (getmntent_r(mountTable,mtpair,bb_common_bufsiz1,
+ sizeof(bb_common_bufsiz1)))
+ {
+ // Don't show rootfs.
+ if (!strcmp(mtpair->mnt_fsname, "rootfs")) continue;
+
+ if (!fstype || !strcmp(mtpair->mnt_type, fstype))
+ printf("%s on %s type %s (%s)\n", mtpair->mnt_fsname,
+ mtpair->mnt_dir, mtpair->mnt_type,
+ mtpair->mnt_opts);
}
+ if (ENABLE_FEATURE_CLEAN_UP) endmntent(mountTable);
+ return EXIT_SUCCESS;
}
- i--;
- argv++;
+ } else storage_path = bb_simplify_path(argv[optind]);
+
+ // When we have two arguments, the second is the directory and we can
+ // skip looking at fstab entirely. We can always abspath() the directory
+ // argument when we get it.
+
+ if (optind+2 == argc) {
+ mtpair->mnt_fsname = argv[optind];
+ mtpair->mnt_dir = argv[optind+1];
+ mtpair->mnt_type = fstype;
+ mtpair->mnt_opts = cmdopts;
+ rc = singlemount(mtpair, 0);
+ goto clean_up;
}
- if (all == TRUE || directory == NULL) {
- struct mntent *m;
- FILE *f = setmntent("/etc/fstab", "r");
- fstabmount = TRUE;
+ // If we have a shared subtree flag, don't worry about fstab or mtab.
+ i = parse_mount_options(cmdopts,0);
+ if (ENABLE_FEATURE_MOUNT_FLAGS &&
+ (i & (MS_SHARED | MS_PRIVATE | MS_SLAVE | MS_UNBINDABLE )))
+ {
+ rc = mount("", argv[optind], "", i, "");
+ if (rc) bb_perror_msg_and_die("%s", argv[optind]);
+ goto clean_up;
+ }
+
+ // Open either fstab or mtab
- if (f == NULL)
- perror_msg_and_die( "\nCannot read /etc/fstab");
+ if (parse_mount_options(cmdopts,0) & MS_REMOUNT)
+ fstabname = bb_path_mtab_file;
+ else fstabname="/etc/fstab";
- 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);
+ if (!(fstab=setmntent(fstabname,"r")))
+ bb_perror_msg_and_die("cannot read %s",fstabname);
+
+ // Loop through entries until we find what we're looking for.
+
+ memset(mtpair,0,sizeof(mtpair));
+ for (;;) {
+ struct mntent *mtnext = mtpair + (mtcur==mtpair ? 1 : 0);
+
+ // Get next fstab entry
+
+ if (!getmntent_r(fstab, mtcur, bb_common_bufsiz1
+ + (mtcur==mtpair ? sizeof(bb_common_bufsiz1)/2 : 0),
+ sizeof(bb_common_bufsiz1)/2))
+ {
+ // Were we looking for something specific?
+
+ if (optind != argc) {
+
+ // If we didn't find anything, complain.
+
+ if (!mtnext->mnt_fsname)
+ bb_error_msg_and_die("can't find %s in %s",
+ argv[optind], fstabname);
+
+ // Mount the last thing we found.
+
+ mtcur = mtnext;
+ mtcur->mnt_opts = xstrdup(mtcur->mnt_opts);
+ append_mount_options(&(mtcur->mnt_opts),cmdopts);
+ rc = singlemount(mtcur, 0);
+ free(mtcur->mnt_opts);
}
-
- device = strdup(m->mnt_fsname);
- directory = strdup(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;
- }
+ goto clean_up;
+ }
+
+ /* If we're trying to mount something specific and this isn't it,
+ * skip it. Note we must match both the exact text in fstab (ala
+ * "proc") or a full path from root */
+
+ if (optind != argc) {
+
+ // Is this what we're looking for?
+
+ if(strcmp(argv[optind],mtcur->mnt_fsname) &&
+ strcmp(storage_path,mtcur->mnt_fsname) &&
+ strcmp(argv[optind],mtcur->mnt_dir) &&
+ strcmp(storage_path,mtcur->mnt_dir)) continue;
+
+ // Remember this entry. Something later may have overmounted
+ // it, and we want the _last_ match.
+
+ mtcur = mtnext;
+
+ // If we're mounting all.
+
+ } else {
+
+ // Do we need to match a filesystem type?
+ if (fstype && strcmp(mtcur->mnt_type,fstype)) continue;
+
+ // Skip noauto and swap anyway.
+
+ if (parse_mount_options(mtcur->mnt_opts,0)
+ & (MOUNT_NOAUTO | MOUNT_SWAP)) continue;
+
+ // Mount this thing.
+
+ if (singlemount(mtcur, 1)) {
+ /* Count number of failed mounts */
+ rc++;
}
-#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);
-
- return rc;
}
-
- goto singlemount;
-
-goodbye:
- show_usage();
+ if (ENABLE_FEATURE_CLEAN_UP) endmntent(fstab);
+
+clean_up:
+
+ if (ENABLE_FEATURE_CLEAN_UP) {
+ free(storage_path);
+ free(cmdopts);
+ }
+
+ return rc;
}
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