*
* Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
* Copyright (C) 2005 by Rob Landley <rob@landley.net>
- *
+ *
* This program is licensed under the GNU General Public license (GPL)
* version 2 or later, see http://www.fsf.org/licensing/licenses/gpl.html
* or the file "LICENSE" in the busybox source tarball for the full text.
*
*/
-#include <limits.h>
-#include <stdio.h>
+#include "busybox.h"
#include <mntent.h>
#include <errno.h>
#include <string.h>
-#include <stdlib.h>
-#include <sys/mount.h>
-#include "busybox.h"
+#include <getopt.h>
-extern int umount_main(int argc, char **argv)
+#define OPTION_STRING "flDnrvad"
+#define OPT_FORCE 1
+#define OPT_LAZY 2
+#define OPT_DONTFREELOOP 4
+#define OPT_NO_MTAB 8
+#define OPT_REMOUNT 16
+#define OPT_IGNORED 32 // -v is ignored
+#define OPT_ALL (ENABLE_FEATURE_UMOUNT_ALL ? 64 : 0)
+
+int umount_main(int argc, char **argv)
{
- int doForce = 0;
- int freeLoop = ENABLE_FEATURE_MOUNT_LOOP;
- int useMtab = ENABLE_FEATURE_MTAB_SUPPORT;
- int umountAll = FALSE;
- int doRemount = FALSE;
+ int doForce;
char path[2*PATH_MAX];
struct mntent me;
FILE *fp;
- int status=EXIT_SUCCESS;
+ int status = EXIT_SUCCESS;
+ unsigned long opt;
struct mtab_list {
char *dir;
char *device;
- struct mtab_list *next;
+ struct mtab_list *next;
} *mtl, *m;
- if(argc < 2) bb_show_usage();
-
/* Parse any options */
- while (--argc > 0 && **(++argv) == '-') {
- while (*++(*argv)) {
- if(**argv=='a') umountAll = TRUE;
- else if(ENABLE_FEATURE_MOUNT_LOOP && **argv=='D') freeLoop = FALSE;
- else if(ENABLE_FEATURE_MTAB_SUPPORT && **argv=='n') useMtab = FALSE;
- else if(**argv=='f') doForce = 1; // MNT_FORCE
- else if(**argv=='l') doForce = 2; // MNT_DETACH
- else if(**argv=='r') doRemount = TRUE;
- else if(**argv=='v');
- else bb_show_usage();
- }
- }
+
+ opt = bb_getopt_ulflags(argc, argv, OPTION_STRING);
+
+ argc -= optind;
+ argv += optind;
+
+ doForce = MAX((opt & OPT_FORCE), (opt & OPT_LAZY));
/* Get a list of mount points from mtab. We read them all in now mostly
* for umount -a (so we don't have to worry about the list changing while
* we iterate over it, or about getting stuck in a loop on the same failing
* entry. Notice that this also naturally reverses the list so that -a
* umounts the most recent entries first. */
-
- m=mtl=0;
- if(!(fp = setmntent(bb_path_mtab_file, "r")))
- bb_error_msg_and_die("Cannot open %s", bb_path_mtab_file);
- while (getmntent_r(fp,&me,path,sizeof(path))) {
- m=xmalloc(sizeof(struct mtab_list));
- m->next=mtl;
- m->device=bb_xstrdup(me.mnt_fsname);
- m->dir=bb_xstrdup(me.mnt_dir);
- mtl=m;
- }
- endmntent(fp);
+
+ m = mtl = 0;
/* If we're umounting all, then m points to the start of the list and
* the argument list should be empty (which will match all). */
- if(!umountAll) m=0;
+ if (!(fp = setmntent(bb_path_mtab_file, "r"))) {
+ if (opt & OPT_ALL)
+ bb_error_msg_and_die("Cannot open %s", bb_path_mtab_file);
+ } else while (getmntent_r(fp,&me,path,sizeof(path))) {
+ m = xmalloc(sizeof(struct mtab_list));
+ m->next = mtl;
+ m->device = bb_xstrdup(me.mnt_fsname);
+ m->dir = bb_xstrdup(me.mnt_dir);
+ mtl = m;
+ }
+ endmntent(fp);
+
+ /* If we're not mounting all, we need at least one argument. */
+ if (!(opt & OPT_ALL)) {
+ m = 0;
+ if (!argc) bb_show_usage();
+ }
+
+
+
// Loop through everything we're supposed to umount, and do so.
- for(;;) {
+ for (;;) {
int curstat;
-
- // Do we alrady know what to umount this time through the loop?
- if(m) safe_strncpy(path,m->dir,PATH_MAX);
- // For umountAll, end of mtab means time to exit.
- else if(umountAll) break;
+
+ // Do we already know what to umount this time through the loop?
+ if (m) safe_strncpy(path, m->dir, PATH_MAX);
+ // For umount -a, end of mtab means time to exit.
+ else if (opt & OPT_ALL) break;
// Get next command line argument (and look it up in mtab list)
- else if(!argc--) break;
+ else if (!argc--) break;
else {
- // Get next command line argument (and look it up in mtab list)
realpath(*argv++, path);
- for(m = mtl; m; m = m->next)
- if(!strcmp(path, m->dir) || !strcmp(path, m->device))
+ for (m = mtl; m; m = m->next)
+ if (!strcmp(path, m->dir) || !strcmp(path, m->device))
break;
}
curstat = umount(path);
// Force the unmount, if necessary.
- if(curstat && doForce) {
+ if (curstat && doForce) {
curstat = umount2(path, doForce);
- if(curstat)
+ if (curstat)
bb_error_msg_and_die("forced umount of %s failed!", path);
}
- // If still can't umount, maybe remount read-only?
- if (curstat && doRemount && errno == EBUSY && m) {
+ // If still can't umount, maybe remount read-only?
+ if (curstat && (opt & OPT_REMOUNT) && errno == EBUSY && m) {
curstat = mount(m->device, path, NULL, MS_REMOUNT|MS_RDONLY, NULL);
bb_error_msg(curstat ? "Cannot remount %s read-only" :
"%s busy - remounted read-only", m->device);
}
- /* De-allcate the loop device. This ioctl should be ignored on any
+ /* De-allocate the loop device. This ioctl should be ignored on any
* non-loop block devices. */
- if(ENABLE_FEATURE_MOUNT_LOOP && freeLoop && m)
+ if (ENABLE_FEATURE_MOUNT_LOOP && !(opt & OPT_DONTFREELOOP) && m)
del_loop(m->device);
- if(curstat) {
- if(useMtab && m) erase_mtab(m->dir);
+ if (curstat) {
+ /* Yes, the ENABLE is redundant here, but the optimizer for ARM
+ * can't do simple constant propagation in local variables... */
+ if(ENABLE_FEATURE_MTAB_SUPPORT && !(opt & OPT_NO_MTAB) && m)
+ erase_mtab(m->dir);
status = EXIT_FAILURE;
- bb_perror_msg("Couldn't umount %s\n", path);
+ bb_perror_msg("Couldn't umount %s", path);
}
// Find next matching mtab entry for -a or umount /dev
- while(m && (m = m->next))
- if(umountAll || !strcmp(path,m->device))
- break;
+ while (m && (m = m->next))
+ if ((opt & OPT_ALL) || !strcmp(path,m->device))
+ break;
}
// Free mtab list if necessary
-
- if(ENABLE_FEATURE_CLEAN_UP) {
- while(mtl) {
- m=mtl->next;
+
+ if (ENABLE_FEATURE_CLEAN_UP) {
+ while (mtl) {
+ m = mtl->next;
free(mtl->device);
free(mtl->dir);
free(mtl);
projects / oweals / busybox.git / blobdiff