kmod: automatically load a few kernel modules we need for normal operation before udev is active

4 files changed, 138 insertions, 12 deletions

diff --git a/src/automount.c b/src/automount.c
index 730b157..3268046 100644
--- a/src/automount.c
+++ b/src/automount.c
@@ -276,18 +276,8 @@ static int open_dev_autofs(Manager *m) {
                 return m->dev_autofs_fd;
 
         if ((m->dev_autofs_fd = open("/dev/autofs", O_CLOEXEC|O_RDONLY)) < 0) {
-
-                if (errno == ENOENT || errno == ENODEV) {
-                        log_error("Your kernel apparently lacks built-in autofs4 support. Please fix that. "
-                                  "We'll now try to work around this by calling 'modprobe autofs4'...");
-                        system("/sbin/modprobe -q -- autofs4");
-                        m->dev_autofs_fd = open("/dev/autofs", O_CLOEXEC|O_RDONLY);
-                }
-
-                if (m->dev_autofs_fd < 0) {
-                        log_error("Failed to open /dev/autofs: %s", strerror(errno));
-                        return -errno;
-                }
+                log_error("Failed to open /dev/autofs: %s", strerror(errno));
+                return -errno;
         }
 
         init_autofs_dev_ioctl(&param);
diff --git a/src/kmod-setup.c b/src/kmod-setup.c
new file mode 100644
index 0000000..fa856c9
--- /dev/null
+++ b/src/kmod-setup.c
@@ -0,0 +1,107 @@
+/*-*- Mode: C; c-basic-offset: 8 -*-*/
+
+/***
+  This file is part of systemd.
+
+  Copyright 2010 Lennart Poettering
+
+  systemd 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.
+
+  systemd 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 systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <sys/wait.h>
+#include <unistd.h>
+#include <string.h>
+#include <errno.h>
+
+#include "macro.h"
+#include "execute.h"
+
+#include "kmod-setup.h"
+
+static const char * const kmod_table[] = {
+        "autofs4", "/sys/class/misc/autofs",
+        "ipv6",    "/sys/module/ipv6"
+};
+
+int kmod_setup(void) {
+        unsigned i, n = 0;
+        const char * cmdline[3 + ELEMENTSOF(kmod_table) + 1];
+        ExecCommand command;
+        ExecContext context;
+        pid_t pid;
+        int status, r;
+
+        for (i = 0; i < ELEMENTSOF(kmod_table); i += 2) {
+
+                if (access(kmod_table[i+1], F_OK) >= 0)
+                        continue;
+
+                log_info("Your kernel apparently lacks built-in %s support. Please fix that. "
+                         "We'll now try to work around this by calling '/sbin/modprobe %s'...",
+                         kmod_table[i], kmod_table[i]);
+
+                cmdline[3 + n++] = kmod_table[i];
+        }
+
+        if (n <= 0)
+                return 0;
+
+        cmdline[0] = "/sbin/modprobe";
+        cmdline[1] = "-qab";
+        cmdline[2] = "--";
+        cmdline[3 + n] = NULL;
+
+        zero(command);
+        zero(context);
+
+        command.path = (char*) cmdline[0];
+        command.argv = (char**) cmdline;
+
+        exec_context_init(&context);
+        r = exec_spawn(&command, NULL, &context, NULL, 0, NULL, false, false, false, NULL, &pid);
+        exec_context_done(&context);
+
+        if (r < 0)
+                return r;
+
+        for (;;) {
+                if (waitpid(pid, &status, 0) < 0) {
+
+                        if (errno == EINTR)
+                                continue;
+
+                        return -errno;
+                }
+
+                break;
+        }
+
+        if (WIFEXITED(status)) {
+                if (WEXITSTATUS(status) != 0) {
+                        log_warning("/sbin/modprobe failed with error code %i.", WEXITSTATUS(status));
+                        return -EPROTO;
+                }
+
+                log_debug("/sbin/modprobe succeeded.");
+                return 0;
+        }
+
+        if (WIFSIGNALED(status)) {
+                log_warning("/sbin/modprobe terminated by signal %s.", strsignal(WTERMSIG(status)));
+                return -EPROTO;
+        }
+
+        log_warning("/sbin/modprobe failed due to unknown reason.");
+        return -EPROTO;
+}
diff --git a/src/kmod-setup.h b/src/kmod-setup.h
new file mode 100644
index 0000000..c102b52
--- /dev/null
+++ b/src/kmod-setup.h
@@ -0,0 +1,27 @@
+/*-*- Mode: C; c-basic-offset: 8 -*-*/
+
+#ifndef fookmodsetuphfoo
+#define fookmodsetuphfoo
+
+/***
+  This file is part of systemd.
+
+  Copyright 2010 Lennart Poettering
+
+  systemd 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.
+
+  systemd 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 systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+int kmod_setup(void);
+
+#endif
diff --git a/src/main.c b/src/main.c
index 2e754fe..95d2115 100644
--- a/src/main.c
+++ b/src/main.c
@@ -37,6 +37,7 @@
 #include "mount-setup.h"
 #include "hostname-setup.h"
 #include "loopback-setup.h"
+#include "kmod-setup.h"
 #include "load-fragment.h"
 #include "fdset.h"
 
@@ -639,6 +640,7 @@ int main(int argc, char *argv[]) {
         log_debug("systemd running in %s mode.", manager_running_as_to_string(running_as));
 
         if (running_as == MANAGER_INIT) {
+                kmod_setup();
                 hostname_setup();
                 loopback_setup();
         }