/**
* mnt_context_umount:
* @cxt: umount context
*
* High-level, umounts filesystem by umount(2) or fork()+exec(/sbin/umount.type).
*
* This is similar to:
*
* mnt_context_prepare_umount(cxt);
* mnt_context_do_umount(cxt);
* mnt_context_finalize_umount(cxt);
*
* See also mnt_context_disable_helpers().
*
* WARNING: non-zero return code does not mean that umount(2) syscall or
* umount.type helper wasn't successfully called.
*
* Check mnt_context_get_status() after error!
*
* Returns: 0 on success;
* >0 in case of umount(2) error (returns syscall errno),
* <0 in case of other errors.
*/
int mnt_context_umount(struct libmnt_context *cxt)
{
int rc;
assert(cxt);
assert(cxt->fs);
assert(cxt->helper_exec_status == 1);
assert(cxt->syscall_status == 1);
DBG(CXT, mnt_debug_h(cxt, "umount: %s", mnt_context_get_target(cxt)));
rc = mnt_context_prepare_umount(cxt);
if (!rc)
rc = mnt_context_prepare_update(cxt);
if (!rc)
rc = mnt_context_do_umount(cxt);
if (!rc)
rc = mnt_context_update_tabs(cxt);
return rc;
}
static int umount_main(struct libmnt_context *cxt, int argc, char **argv)
{
int rc, c;
char *spec = NULL, *opts = NULL;
static const struct option longopts[] = {
{ "force", 0, 0, 'f' },
{ "help", 0, 0, 'h' },
{ "no-mtab", 0, 0, 'n' },
{ "verbose", 0, 0, 'v' },
{ "read-only", 0, 0, 'r' },
{ "lazy", 0, 0, 'l' },
{ "types", 1, 0, 't' },
{ NULL, 0, 0, 0 }
};
mnt_context_init_helper(cxt, MNT_ACT_UMOUNT, 0);
while ((c = getopt_long (argc, argv, "fvnrlh", longopts, NULL)) != -1) {
rc = mnt_context_helper_setopt(cxt, c, optarg);
if (rc == 0) /* valid option */
continue;
if (rc < 0) /* error (probably ENOMEM) */
goto err;
/* rc==1 means unknow option */
umount_usage();
return EX_USAGE;
}
if (optind < argc)
spec = argv[optind++];
if (!spec || (*spec != '/' && strchr(spec,':') == NULL)) {
nfs_error(_("%s: no mount point provided"), progname);
return EX_USAGE;
}
if (mnt_context_set_target(cxt, spec))
goto err;
if (mnt_context_set_fstype_pattern(cxt, "nfs,nfs4")) /* restrict filesystems */
goto err;
/* read mtab/fstab, evaluate permissions, etc. */
rc = mnt_context_prepare_umount(cxt);
if (rc) {
nfs_error(_("%s: failed to prepare umount: %s\n"),
progname, strerror(-rc));
goto err;
}
opts = retrieve_mount_options(mnt_context_get_fs(cxt));
if (!mnt_context_is_lazy(cxt)) {
if (opts) {
/* we have full FS description (e.g. from mtab or /proc) */
switch (is_vers4(cxt)) {
case 0:
/* We ignore the error from nfs_umount23.
* If the actual umount succeeds (in del_mtab),
* we don't want to signal an error, as that
* could cause /sbin/mount to retry!
*/
nfs_umount23(mnt_context_get_source(cxt), opts);
break;
case 1: /* unknown */
break;
default: /* error */
goto err;
}
} else
/* strange, no entry in mtab or /proc not mounted */
nfs_umount23(spec, "tcp,v3");
}
rc = mnt_context_do_umount(cxt); /* call umount(2) syscall */
mnt_context_finalize_mount(cxt); /* mtab update */
if (rc && !mnt_context_get_status(cxt)) {
/* mnt_context_do_umount() returns errno if umount(2) failed */
umount_error(rc, spec);
goto err;
}
free(opts);
return EX_SUCCESS;
err:
free(opts);
return EX_FAIL;
}