* Mini umount implementation for busybox
*
*
- * Copyright (C) 1999 by Lineo, inc.
+ * 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
*
*/
-#include "internal.h"
#include <stdio.h>
-#include <sys/mount.h>
#include <mntent.h>
-#include <fstab.h>
#include <errno.h>
+#include <string.h>
+#include <stdlib.h>
+#include "busybox.h"
-static const char umount_usage[] =
- "umount [flags] filesystem|directory\n\n"
- "Flags:\n" "\t-a:\tUnmount all file systems"
-#ifdef BB_MTAB
- " in /etc/mtab\n\t-n:\tDon't erase /etc/mtab entries\n"
-#else
- "\n"
-#endif
-#ifdef BB_FEATURE_REMOUNT
- "\t-r:\tTry to remount devices as read-only if mount is busy\n"
-#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;
+#if defined BB_FEATURE_MOUNT_FORCE
+static int doForce = FALSE;
+#endif
+#if defined BB_FEATURE_MOUNT_LOOP
+static int freeLoop = TRUE;
+#endif
static int useMtab = TRUE;
static int umountAll = FALSE;
static int doRemount = FALSE;
extern const char mtab_file[]; /* Defined in utility.c */
-#define MIN(x,y) (x > y ? x : y)
-
-static int do_umount(const char *name, int useMtab)
-{
- 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 (blockDevice != NULL && !strncmp("/dev/loop", blockDevice, 9))
- /* this was a loop device, delete it */
- del_loop(blockDevice);
-#endif
-#if defined BB_FEATURE_REMOUNT
- if (status != 0 && doRemount == TRUE && errno == EBUSY) {
- status = mount(blockDevice, name, NULL,
- MS_MGC_VAL | MS_REMOUNT | MS_RDONLY, NULL);
- if (status == 0) {
- fprintf(stderr, "umount: %s busy - remounted read-only\n",
- blockDevice);
- /* TODO: update mtab if BB_MTAB is defined */
- } else {
- fprintf(stderr, "umount: Cannot remount %s read-only\n",
- blockDevice);
- }
- }
-#endif
- if (status == 0) {
-#if defined BB_MTAB
- if (useMtab == TRUE)
- erase_mtab(name);
-#endif
- return (TRUE);
- }
- return (FALSE);
-}
-
-static int umount_all(int useMtab)
-{
- int status = TRUE;
- char *mountpt;
- void *iter;
-
- for (mountpt = mtab_first(&iter); mountpt; mountpt = mtab_next(&iter)) {
- status = do_umount(mountpt, useMtab);
- if (status != 0) {
- /* Don't bother retrying the umount on busy devices */
- if (errno == EBUSY) {
- perror(mountpt);
- continue;
- }
- status = do_umount(mountpt, useMtab);
- if (status != 0) {
- printf("Couldn't umount %s on %s: %s\n",
- mountpt, mtab_getinfo(mountpt, MTAB_GETDEVICE),
- strerror(errno));
- }
- }
- }
- return (status);
-}
-
-extern int umount_main(int argc, char **argv)
-{
- if (argc < 2) {
- usage(umount_usage);
- }
-
- /* Parse any options */
- while (--argc > 0 && **(++argv) == '-') {
- while (*++(*argv))
- switch (**argv) {
- case 'a':
- umountAll = TRUE;
- break;
-#ifdef BB_MTAB
- case 'n':
- useMtab = FALSE;
- break;
-#endif
-#ifdef BB_FEATURE_REMOUNT
- case 'r':
- doRemount = TRUE;
- break;
-#endif
- default:
- usage(umount_usage);
- }
- }
-
- mtab_read();
- if (umountAll == TRUE) {
- exit(umount_all(useMtab));
- }
- if (do_umount(*argv, useMtab) == 0)
- exit(TRUE);
- else {
- perror("umount");
- exit(FALSE);
- }
-}
-
/* 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
*/
void mtab_read(void)
{
return;
if ((fp = setmntent(mtab_file, "r")) == NULL) {
- fprintf(stderr, "Cannot open %s\n", mtab_file);
+ error_msg("Cannot open %s", mtab_file);
return;
}
while ((e = getmntent(fp))) {
- entry = malloc(sizeof(struct _mtab_entry_t));
-
+ entry = xmalloc(sizeof(struct _mtab_entry_t));
entry->device = strdup(e->mnt_fsname);
entry->mountpt = strdup(e->mnt_dir);
entry->next = mtab_cache;
} else {
#if !defined BB_MTAB
if (strcmp(cur->device, "/dev/root") == 0) {
- struct fstab *fstabItem;
-
- fstabItem = getfsfile("/");
- if (fstabItem != NULL)
- return fstabItem->fs_spec;
+ /* Adjusts device to be the real root device,
+ * or leaves device alone if it can't find it */
+ find_real_root_device_name( cur->device);
+ return ( cur->device);
}
#endif
return cur->device;
return mp;
}
+/* Don't bother to clean up, since exit() does that
+ * automagically, so we can save a few bytes */
+#ifdef BB_FEATURE_CLEAN_UP
void mtab_free(void)
{
struct _mtab_entry_t *this, *next;
this = next;
}
}
+#endif
+
+static int do_umount(const char *name, int useMtab)
+{
+ 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_MTAB
+ if (useMtab == TRUE)
+ erase_mtab(name);
+#endif
+ return (TRUE);
+ }
+ return (FALSE);
+}
+
+static int umount_all(int useMtab)
+{
+ 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, useMtab)) {
+ /* Don't bother retrying the umount on busy devices */
+ if (errno == EBUSY) {
+ perror_msg("%s", mountpt);
+ status = FALSE;
+ continue;
+ }
+ if (!do_umount(mountpt, useMtab)) {
+ 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)
+{
+ 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_MTAB
+ 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(useMtab) == TRUE)
+ return EXIT_SUCCESS;
+ else
+ return EXIT_FAILURE;
+ }
+ if (do_umount(*argv, useMtab) == TRUE)
+ return EXIT_SUCCESS;
+ perror_msg_and_die("%s", *argv);
+}
+
projects / oweals / busybox.git / blobdiff