Remove obsolete MTD support.
Bug: http://b/29250988
Change-Id: Ia97ba9082a165c37f74d6e1c3f71a367adc59945
diff --git a/mounts.cpp b/mounts.cpp
new file mode 100644
index 0000000..f23376b
--- /dev/null
+++ b/mounts.cpp
@@ -0,0 +1,89 @@
+/*
+ * Copyright (C) 2007 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "mounts.h"
+
+#include <errno.h>
+#include <fcntl.h>
+#include <mntent.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/mount.h>
+
+#include <string>
+#include <vector>
+
+struct MountedVolume {
+ std::string device;
+ std::string mount_point;
+ std::string filesystem;
+ std::string flags;
+};
+
+std::vector<MountedVolume*> g_mounts_state;
+
+bool scan_mounted_volumes() {
+ for (size_t i = 0; i < g_mounts_state.size(); ++i) {
+ delete g_mounts_state[i];
+ }
+ g_mounts_state.clear();
+
+ // Open and read mount table entries.
+ FILE* fp = setmntent("/proc/mounts", "re");
+ if (fp == NULL) {
+ return false;
+ }
+ mntent* e;
+ while ((e = getmntent(fp)) != NULL) {
+ MountedVolume* v = new MountedVolume;
+ v->device = e->mnt_fsname;
+ v->mount_point = e->mnt_dir;
+ v->filesystem = e->mnt_type;
+ v->flags = e->mnt_opts;
+ g_mounts_state.push_back(v);
+ }
+ endmntent(fp);
+ return true;
+}
+
+MountedVolume* find_mounted_volume_by_device(const char* device) {
+ for (size_t i = 0; i < g_mounts_state.size(); ++i) {
+ if (g_mounts_state[i]->device == device) return g_mounts_state[i];
+ }
+ return nullptr;
+}
+
+MountedVolume* find_mounted_volume_by_mount_point(const char* mount_point) {
+ for (size_t i = 0; i < g_mounts_state.size(); ++i) {
+ if (g_mounts_state[i]->mount_point == mount_point) return g_mounts_state[i];
+ }
+ return nullptr;
+}
+
+int unmount_mounted_volume(MountedVolume* volume) {
+ // Intentionally pass the empty string to umount if the caller tries
+ // to unmount a volume they already unmounted using this
+ // function.
+ std::string mount_point = volume->mount_point;
+ volume->mount_point.clear();
+ return umount(mount_point.c_str());
+}
+
+int remount_read_only(MountedVolume* volume) {
+ return mount(volume->device.c_str(), volume->mount_point.c_str(), volume->filesystem.c_str(),
+ MS_NOATIME | MS_NODEV | MS_NODIRATIME | MS_RDONLY | MS_REMOUNT, 0);
+}