diff options
Diffstat (limited to 'umount.c')
| -rw-r--r-- | umount.c | 298 |
1 files changed, 0 insertions, 298 deletions
diff --git a/umount.c b/umount.c deleted file mode 100644 index 74638d2..0000000 --- a/umount.c +++ /dev/null @@ -1,298 +0,0 @@ -/* vi: set sw=4 ts=4: */ -/* - * Mini umount implementation for busybox - * - * - * Copyright (C) 1999,2000,2001 by Lineo, inc. - * Written by Erik Andersen <andersen@lineo.com>, <andersee@debian.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 - * - */ - -#include <limits.h> -#include <stdio.h> -#include <mntent.h> -#include <errno.h> -#include <string.h> -#include <stdlib.h> -#include "busybox.h" - -/* Teach libc5 about realpath -- it includes it but the - * prototype is missing... */ -#if (__GLIBC__ <= 2) && (__GLIBC_MINOR__ < 1) -extern char *realpath(const char *path, char *resolved_path); -#endif - -static const int MNT_FORCE = 1; -static const int MS_MGC_VAL = 0xc0ed0000; /* Magic number indicatng "new" flags */ -static const int MS_REMOUNT = 32; /* Alter flags of a mounted FS. */ -static const int MS_RDONLY = 1; /* Mount read-only. */ - -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); - -struct _mtab_entry_t { - char *device; - char *mountpt; - struct _mtab_entry_t *next; -}; - -static struct _mtab_entry_t *mtab_cache = NULL; - - - -#if defined BB_FEATURE_MOUNT_FORCE -static int doForce = FALSE; -#endif -#if defined BB_FEATURE_MOUNT_LOOP -static int freeLoop = TRUE; -#endif -#if defined BB_FEATURE_MTAB_SUPPORT -static int useMtab = TRUE; -#endif -static int umountAll = FALSE; -static int doRemount = FALSE; -extern const char mtab_file[]; /* Defined in utility.c */ - - - -/* These functions are here because the getmntent functions do not appear - * to be re-entrant, which leads to all sorts of problems when we try to - * use them recursively - randolph - * - * TODO: Perhaps switch to using Glibc's getmntent_r - * -Erik - */ -static void mtab_read(void) -{ - struct _mtab_entry_t *entry = NULL; - struct mntent *e; - FILE *fp; - - if (mtab_cache != NULL) - return; - - if ((fp = setmntent(mtab_file, "r")) == NULL) { - error_msg("Cannot open %s", mtab_file); - return; - } - while ((e = getmntent(fp))) { - entry = xmalloc(sizeof(struct _mtab_entry_t)); - entry->device = strdup(e->mnt_fsname); - entry->mountpt = strdup(e->mnt_dir); - entry->next = mtab_cache; - mtab_cache = entry; - } - endmntent(fp); -} - -static char *mtab_getinfo(const char *match, const char which) -{ - struct _mtab_entry_t *cur = mtab_cache; - - while (cur) { - if (strcmp(cur->mountpt, match) == 0 || - strcmp(cur->device, match) == 0) { - if (which == MTAB_GETMOUNTPT) { - return cur->mountpt; - } else { -#if !defined BB_FEATURE_MTAB_SUPPORT - if (strcmp(cur->device, "/dev/root") == 0) { - /* Adjusts device to be the real root device, - * or leaves device alone if it can't find it */ - cur->device = find_real_root_device_name(cur->device); - } -#endif - return cur->device; - } - } - cur = cur->next; - } - return NULL; -} - -static char *mtab_next(void **iter) -{ - char *mp; - - if (iter == NULL || *iter == NULL) - return NULL; - mp = ((struct _mtab_entry_t *) (*iter))->mountpt; - *iter = (void *) ((struct _mtab_entry_t *) (*iter))->next; - return mp; -} - -static char *mtab_first(void **iter) -{ - struct _mtab_entry_t *mtab_iter; - - if (!iter) - return NULL; - mtab_iter = mtab_cache; - *iter = (void *) mtab_iter; - return mtab_next(iter); -} - -/* Don't bother to clean up, since exit() does that - * automagically, so we can save a few bytes */ -#ifdef BB_FEATURE_CLEAN_UP -static void mtab_free(void) -{ - struct _mtab_entry_t *this, *next; - - this = mtab_cache; - while (this) { - next = this->next; - if (this->device) - free(this->device); - if (this->mountpt) - free(this->mountpt); - free(this); - this = next; - } -} -#endif - -static int do_umount(const char *name) -{ - int status; - char *blockDevice = mtab_getinfo(name, MTAB_GETDEVICE); - - if (blockDevice && strcmp(blockDevice, name) == 0) - name = mtab_getinfo(blockDevice, MTAB_GETMOUNTPT); - - status = umount(name); - -#if defined BB_FEATURE_MOUNT_LOOP - if (freeLoop == TRUE && blockDevice != NULL && !strncmp("/dev/loop", blockDevice, 9)) - /* this was a loop device, delete it */ - del_loop(blockDevice); -#endif -#if defined BB_FEATURE_MOUNT_FORCE - if (status != 0 && doForce == TRUE) { - status = umount2(blockDevice, MNT_FORCE); - if (status != 0) { - error_msg_and_die("forced umount of %s failed!", blockDevice); - } - } -#endif - if (status != 0 && doRemount == TRUE && errno == EBUSY) { - status = mount(blockDevice, name, NULL, - MS_MGC_VAL | MS_REMOUNT | MS_RDONLY, NULL); - if (status == 0) { - error_msg("%s busy - remounted read-only", blockDevice); - } else { - error_msg("Cannot remount %s read-only", blockDevice); - } - } - if (status == 0) { -#if defined BB_FEATURE_MTAB_SUPPORT - if (useMtab == TRUE) - erase_mtab(name); -#endif - return (TRUE); - } - return (FALSE); -} - -static int umount_all(void) -{ - int status = TRUE; - char *mountpt; - void *iter; - - for (mountpt = mtab_first(&iter); mountpt; mountpt = mtab_next(&iter)) { - /* Never umount /proc on a umount -a */ - if (strstr(mountpt, "proc")!= NULL) - continue; - if (!do_umount(mountpt)) { - /* Don't bother retrying the umount on busy devices */ - if (errno == EBUSY) { - perror_msg("%s", mountpt); - status = FALSE; - continue; - } - if (!do_umount(mountpt)) { - printf("Couldn't umount %s on %s: %s\n", - mountpt, mtab_getinfo(mountpt, MTAB_GETDEVICE), - strerror(errno)); - status = FALSE; - } - } - } - return (status); -} - -extern int umount_main(int argc, char **argv) -{ - char path[PATH_MAX]; - - if (argc < 2) { - show_usage(); - } -#ifdef BB_FEATURE_CLEAN_UP - atexit(mtab_free); -#endif - - /* Parse any options */ - while (--argc > 0 && **(++argv) == '-') { - while (*++(*argv)) - switch (**argv) { - case 'a': - umountAll = TRUE; - break; -#if defined BB_FEATURE_MOUNT_LOOP - case 'l': - freeLoop = FALSE; - break; -#endif -#ifdef BB_FEATURE_MTAB_SUPPORT - case 'n': - useMtab = FALSE; - break; -#endif -#ifdef BB_FEATURE_MOUNT_FORCE - case 'f': - doForce = TRUE; - break; -#endif - case 'r': - doRemount = TRUE; - break; - case 'v': - break; /* ignore -v */ - default: - show_usage(); - } - } - - mtab_read(); - if (umountAll == TRUE) { - if (umount_all() == TRUE) - return EXIT_SUCCESS; - else - return EXIT_FAILURE; - } - if (realpath(*argv, path) == NULL) - perror_msg_and_die("%s", path); - if (do_umount(path) == TRUE) - return EXIT_SUCCESS; - perror_msg_and_die("%s", *argv); -} - |