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author | Elliott Hughes <enh@google.com> | 2016-06-16 00:28:05 +0200 |
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committer | android-build-merger <android-build-merger@google.com> | 2016-06-16 00:28:05 +0200 |
commit | eaddde6888b1f58d70b338ad7725214781014324 (patch) | |
tree | 95df40add23e127030abe0cb224c606659a33932 /mounts.cpp | |
parent | Merge \\"Add bootloader_message_ab struct.\\" am: 59f04b9982 (diff) | |
parent | resolve merge conflicts of 179c0d8 to stage-aosp-master (diff) | |
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Diffstat (limited to '')
-rw-r--r-- | mounts.cpp | 89 |
1 files changed, 89 insertions, 0 deletions
diff --git a/mounts.cpp b/mounts.cpp new file mode 100644 index 000000000..f23376b06 --- /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); +} |