diff options
Diffstat (limited to 'util-linux')
| -rw-r--r-- | util-linux/umount.c | 73 |
1 files changed, 37 insertions, 36 deletions
diff --git a/util-linux/umount.c b/util-linux/umount.c index 2a25c3f..3f7c0ab 100644 --- a/util-linux/umount.c +++ b/util-linux/umount.c @@ -13,14 +13,19 @@ #include "libbb.h" /* ignored: -v -d -t -i */ -#define OPTION_STRING "flDnra" "vdt:i" +#define OPTION_STRING "fldnra" "vdt:i" #define OPT_FORCE (1 << 0) #define OPT_LAZY (1 << 1) -#define OPT_DONTFREELOOP (1 << 2) +#define OPT_FREELOOP (1 << 2) #define OPT_NO_MTAB (1 << 3) #define OPT_REMOUNT (1 << 4) #define OPT_ALL (ENABLE_FEATURE_UMOUNT_ALL ? (1 << 5) : 0) +// These constants from linux/fs.h must match OPT_FORCE and OPT_LAZY, +// otherwise "doForce" trick below won't work! +//#define MNT_FORCE 0x00000001 /* Attempt to forcibly umount */ +//#define MNT_DETACH 0x00000002 /* Just detach from the tree */ + int umount_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; int umount_main(int argc, char **argv) { @@ -28,7 +33,7 @@ int umount_main(int argc, char **argv) char *const path = xmalloc(PATH_MAX + 2); /* to save stack */ struct mntent me; FILE *fp; - char *fstype = 0; + char *fstype = NULL; int status = EXIT_SUCCESS; unsigned opt; struct mtab_list { @@ -37,13 +42,9 @@ int umount_main(int argc, char **argv) struct mtab_list *next; } *mtl, *m; - /* Parse any options */ - opt = getopt32(argv, OPTION_STRING, &fstype); - - argc -= optind; + //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 @@ -51,12 +52,10 @@ int umount_main(int argc, char **argv) * 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 = NULL; - 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 we're umounting all, then m points to the start of the list and + // the argument list should be empty (which will match all). fp = setmntent(bb_path_mtab_file, "r"); if (!fp) { if (opt & OPT_ALL) @@ -75,11 +74,11 @@ int umount_main(int argc, char **argv) endmntent(fp); } - /* If we're not umounting all, we need at least one argument. */ + // If we're not umounting all, we need at least one argument. if (!(opt & OPT_ALL) && !fstype) { - m = 0; - if (!argc) + if (!argv[0]) bb_show_usage(); + m = NULL; } // Loop through everything we're supposed to umount, and do so. @@ -93,10 +92,10 @@ int umount_main(int argc, char **argv) // 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; + // Use command line argument (and look it up in mtab list) else { + if (!zapit) + break; argv++; realpath(zapit, path); for (m = mtl; m; m = m->next) @@ -112,26 +111,29 @@ int umount_main(int argc, char **argv) curstat = umount(zapit); // Force the unmount, if necessary. - if (curstat && doForce) { + if (curstat && doForce) curstat = umount2(zapit, doForce); - if (curstat) - bb_error_msg("forced umount of %s failed!", zapit); - } // If still can't umount, maybe remount read-only? - if (curstat && (opt & OPT_REMOUNT) && errno == EBUSY && m) { - curstat = mount(m->device, zapit, NULL, MS_REMOUNT|MS_RDONLY, NULL); - bb_error_msg(curstat ? "cannot remount %s read-only" : - "%s busy - remounted read-only", m->device); - } - if (curstat) { - status = EXIT_FAILURE; - bb_perror_msg("cannot umount %s", zapit); + if ((opt & OPT_REMOUNT) && errno == EBUSY && m) { + // Note! Even if we succeed here, later we should not + // free loop device or erase mtab entry! + const char *msg = "%s busy - remounted read-only"; + curstat = mount(m->device, zapit, NULL, MS_REMOUNT|MS_RDONLY, NULL); + if (curstat) { + msg = "cannot remount %s read-only"; + status = EXIT_FAILURE; + } + bb_error_msg(msg, m->device); + } else { + status = EXIT_FAILURE; + bb_perror_msg("cannot %sumount %s", (doForce ? "forcibly " : ""), zapit); + } } else { - /* De-allocate the loop device. This ioctl should be ignored on - * any non-loop block devices. */ - if (ENABLE_FEATURE_MOUNT_LOOP && !(opt & OPT_DONTFREELOOP) && m) + // De-allocate the loop device. This ioctl should be ignored on + // any non-loop block devices. + if (ENABLE_FEATURE_MOUNT_LOOP && (opt & OPT_FREELOOP) && m) del_loop(m->device); if (ENABLE_FEATURE_MTAB_SUPPORT && !(opt & OPT_NO_MTAB) && m) erase_mtab(m->dir); @@ -140,13 +142,12 @@ int umount_main(int argc, char **argv) // Find next matching mtab entry for -a or umount /dev // Note this means that "umount /dev/blah" will unmount all instances // of /dev/blah, not just the most recent. - while (m && (m = m->next)) + if (m) while ((m = m->next) != NULL) if ((opt & OPT_ALL) || !strcmp(path, m->device)) break; } // Free mtab list if necessary - if (ENABLE_FEATURE_CLEAN_UP) { while (mtl) { m = mtl->next; |