summaryrefslogtreecommitdiffstats
path: root/updater/mounts.cpp
diff options
context:
space:
mode:
authorTao Bao <tbao@google.com>2019-10-01 21:08:33 +0200
committerTao Bao <tbao@google.com>2019-10-01 21:13:04 +0200
commitd628cfc15316605ad541c4cec683462a57458d75 (patch)
treedab464db716b2dbc813bfbe937e70135430b538f /updater/mounts.cpp
parentotautil: roots.cpp no longer needs 'mounts.h'. (diff)
downloadandroid_bootable_recovery-d628cfc15316605ad541c4cec683462a57458d75.tar
android_bootable_recovery-d628cfc15316605ad541c4cec683462a57458d75.tar.gz
android_bootable_recovery-d628cfc15316605ad541c4cec683462a57458d75.tar.bz2
android_bootable_recovery-d628cfc15316605ad541c4cec683462a57458d75.tar.lz
android_bootable_recovery-d628cfc15316605ad541c4cec683462a57458d75.tar.xz
android_bootable_recovery-d628cfc15316605ad541c4cec683462a57458d75.tar.zst
android_bootable_recovery-d628cfc15316605ad541c4cec683462a57458d75.zip
Diffstat (limited to 'updater/mounts.cpp')
-rw-r--r--updater/mounts.cpp82
1 files changed, 82 insertions, 0 deletions
diff --git a/updater/mounts.cpp b/updater/mounts.cpp
new file mode 100644
index 000000000..943d35c75
--- /dev/null
+++ b/updater/mounts.cpp
@@ -0,0 +1,82 @@
+/*
+ * 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>
+
+#include <android-base/logging.h>
+
+struct MountedVolume {
+ std::string device;
+ std::string mount_point;
+ std::string filesystem;
+ std::string flags;
+};
+
+static 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_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();
+ int result = umount(mount_point.c_str());
+ if (result == -1) {
+ PLOG(WARNING) << "Failed to umount " << mount_point;
+ }
+ return result;
+}