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authorLennart Poettering <lennart@poettering.net>2012-04-24 16:42:42 +0200
committerLennart Poettering <lennart@poettering.net>2012-04-24 16:42:42 +0200
commit2b93b027d3a68b5d7ae26d0c2cd487eb5019d2a9 (patch)
tree11846b4ad4a4914a244909619ffc7f1f503f7cdf /src/remount-fs/remount-fs.c
parenta888b352eb53b07daa24fa859ceeb254336b293d (diff)
remount: consolidate remount-api-vfs and remount-rootfs into one
This has the advantage of removing a confusing warning by mount if the root directory is not listed in fstab.
Diffstat (limited to 'src/remount-fs/remount-fs.c')
-rw-r--r--src/remount-fs/remount-fs.c168
1 files changed, 168 insertions, 0 deletions
diff --git a/src/remount-fs/remount-fs.c b/src/remount-fs/remount-fs.c
new file mode 100644
index 0000000000..35b71548a3
--- /dev/null
+++ b/src/remount-fs/remount-fs.c
@@ -0,0 +1,168 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+ 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 Lesser General Public License as published by
+ the Free Software Foundation; either version 2.1 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
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <unistd.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <string.h>
+#include <sys/stat.h>
+#include <sys/wait.h>
+#include <mntent.h>
+
+#include "log.h"
+#include "util.h"
+#include "set.h"
+#include "mount-setup.h"
+#include "exit-status.h"
+
+/* Goes through /etc/fstab and remounts all API file systems, applying
+ * options that are in /etc/fstab that systemd might not have
+ * respected */
+
+int main(int argc, char *argv[]) {
+ int ret = EXIT_FAILURE;
+ FILE *f = NULL;
+ struct mntent* me;
+ Hashmap *pids = NULL;
+
+ if (argc > 1) {
+ log_error("This program takes no argument.");
+ return EXIT_FAILURE;
+ }
+
+ log_set_target(LOG_TARGET_AUTO);
+ log_parse_environment();
+ log_open();
+
+ umask(0022);
+
+ f = setmntent("/etc/fstab", "r");
+ if (!f) {
+ if (errno == ENOENT) {
+ ret = EXIT_SUCCESS;
+ goto finish;
+ }
+
+ log_error("Failed to open /etc/fstab: %m");
+ goto finish;
+ }
+
+ pids = hashmap_new(trivial_hash_func, trivial_compare_func);
+ if (!pids) {
+ log_error("Failed to allocate set");
+ goto finish;
+ }
+
+ ret = EXIT_SUCCESS;
+
+ while ((me = getmntent(f))) {
+ pid_t pid;
+ int k;
+ char *s;
+
+ /* Remount the root fs and all API VFS */
+ if (!mount_point_is_api(me->mnt_dir) &&
+ !path_equal(me->mnt_dir, "/"))
+ continue;
+
+ log_debug("Remounting %s", me->mnt_dir);
+
+ pid = fork();
+ if (pid < 0) {
+ log_error("Failed to fork: %m");
+ ret = EXIT_FAILURE;
+ continue;
+ }
+
+ if (pid == 0) {
+ const char *arguments[5];
+ /* Child */
+
+ arguments[0] = "/bin/mount";
+ arguments[1] = me->mnt_dir;
+ arguments[2] = "-o";
+ arguments[3] = "remount";
+ arguments[4] = NULL;
+
+ execv("/bin/mount", (char **) arguments);
+
+ log_error("Failed to execute /bin/mount: %m");
+ _exit(EXIT_FAILURE);
+ }
+
+ /* Parent */
+
+ s = strdup(me->mnt_dir);
+ if (!s) {
+ log_error("Out of memory.");
+ ret = EXIT_FAILURE;
+ continue;
+ }
+
+
+ k = hashmap_put(pids, UINT_TO_PTR(pid), s);
+ if (k < 0) {
+ log_error("Failed to add PID to set: %s", strerror(-k));
+ ret = EXIT_FAILURE;
+ continue;
+ }
+ }
+
+ while (!hashmap_isempty(pids)) {
+ siginfo_t si;
+ char *s;
+
+ zero(si);
+ if (waitid(P_ALL, 0, &si, WEXITED) < 0) {
+
+ if (errno == EINTR)
+ continue;
+
+ log_error("waitid() failed: %m");
+ ret = EXIT_FAILURE;
+ break;
+ }
+
+ s = hashmap_remove(pids, UINT_TO_PTR(si.si_pid));
+ if (s) {
+ if (!is_clean_exit(si.si_code, si.si_status)) {
+ if (si.si_code == CLD_EXITED)
+ log_error("/bin/mount for %s exited with exit status %i.", s, si.si_status);
+ else
+ log_error("/bin/mount for %s terminated by signal %s.", s, signal_to_string(si.si_status));
+
+ ret = EXIT_FAILURE;
+ }
+
+ free(s);
+ }
+ }
+
+finish:
+
+ if (pids)
+ hashmap_free_free(pids);
+
+ if (f)
+ endmntent(f);
+
+ return ret;
+}