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