a73ed22cb7
Set properties dev.mnt.blk.<mount_point>=<device_block_class> for mount
and umount operations by setting up an Epoll handler to catch
EPOLLERR or EPOLLPRI signals when /proc/mounts is changed. Only
update properties associated with block devices. For the mount
point of /, use the designation of /root instead.
Can use the properties in init rc expansion like:
on property dev.mnt.blk.root=*
write /sys/block/${dev.mnt.blk.root}/queue/read_ahead_kb ${boot_read_ahead_kb:-2048}
on property dev.mnt.blk.data=*
write /sys/block/${dev.mnt.blk.data}/queue/read_ahead_kb ${boot_read_ahead_kb:-2048}
on late-fs
setprop boot_read_ahead_kb 128
write /sys/block/${dev.mnt.blk.root}/queue/read_ahead_kb ${boot_read_ahead_kb}
write /sys/block/${dev.mnt.blk.data}/queue/read_ahead_kb ${boot_read_ahead_kb}
Test: boot and inspect getprop results.
Bug: 124072565
Change-Id: I1b8aff44f922ba372cd926de2919c215c40ee874
59 lines
1.6 KiB
C++
59 lines
1.6 KiB
C++
/*
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* Copyright (C) 2019 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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#pragma once
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#include <stdio.h>
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#include <memory>
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#include <set>
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#include <string>
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#include "epoll.h"
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namespace android {
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namespace init {
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struct MountHandlerEntry {
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MountHandlerEntry(const std::string& blk_device, const std::string& mount_point,
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const std::string& fs_type);
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bool operator<(const MountHandlerEntry& r) const;
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const std::string blk_device;
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const std::string mount_point;
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const std::string fs_type;
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};
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class MountHandler {
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public:
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explicit MountHandler(Epoll* epoll);
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MountHandler(const MountHandler&) = delete;
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MountHandler(MountHandler&&) = delete;
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MountHandler& operator=(const MountHandler&) = delete;
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MountHandler& operator=(MountHandler&&) = delete;
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~MountHandler();
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private:
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void MountHandlerFunction();
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Epoll* epoll_;
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std::unique_ptr<FILE, decltype(&fclose)> fp_;
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std::set<MountHandlerEntry> mounts_;
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};
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} // namespace init
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} // namespace android
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