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https://github.com/RGBCube/serenity
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This device is a block device that allows a user to effectively treat an Inode as a block device. The static construction method is given an OpenFileDescription reference but validates that: - The description has a valid custody (so it's not some arbitrary file). Failing this requirement will yield EINVAL. - The description custody points to an Inode which is a regular file, as we only support (seekable) regular files. Failing this requirement will yield ENOTSUP. LoopDevice can be used to mount a regular file on the filesystem like other supported types of (physical) block devices.
64 lines
2.5 KiB
C++
64 lines
2.5 KiB
C++
/*
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* Copyright (c) 2022, Liav A. <liavalb@hotmail.co.il>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/JsonObjectSerializer.h>
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#include <Kernel/Devices/Loop/LoopDevice.h>
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#include <Kernel/FileSystem/FileBackedFileSystem.h>
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#include <Kernel/FileSystem/SysFS/Subsystems/Kernel/DiskUsage.h>
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#include <Kernel/FileSystem/VirtualFileSystem.h>
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#include <Kernel/Sections.h>
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namespace Kernel {
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UNMAP_AFTER_INIT NonnullRefPtr<SysFSDiskUsage> SysFSDiskUsage::must_create(SysFSDirectory const& parent_directory)
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{
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return adopt_ref_if_nonnull(new (nothrow) SysFSDiskUsage(parent_directory)).release_nonnull();
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}
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UNMAP_AFTER_INIT SysFSDiskUsage::SysFSDiskUsage(SysFSDirectory const& parent_directory)
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: SysFSGlobalInformation(parent_directory)
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{
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}
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ErrorOr<void> SysFSDiskUsage::try_generate(KBufferBuilder& builder)
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{
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auto array = TRY(JsonArraySerializer<>::try_create(builder));
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TRY(VirtualFileSystem::the().for_each_mount([&array](auto& mount) -> ErrorOr<void> {
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auto& fs = mount.guest_fs();
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auto fs_object = TRY(array.add_object());
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TRY(fs_object.add("class_name"sv, fs.class_name()));
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TRY(fs_object.add("total_block_count"sv, fs.total_block_count()));
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TRY(fs_object.add("free_block_count"sv, fs.free_block_count()));
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TRY(fs_object.add("total_inode_count"sv, fs.total_inode_count()));
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TRY(fs_object.add("free_inode_count"sv, fs.free_inode_count()));
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auto mount_point = TRY(mount.absolute_path());
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TRY(fs_object.add("mount_point"sv, mount_point->view()));
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TRY(fs_object.add("block_size"sv, static_cast<u64>(fs.logical_block_size())));
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TRY(fs_object.add("readonly"sv, fs.is_readonly()));
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TRY(fs_object.add("mount_flags"sv, mount.flags()));
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if (fs.is_file_backed()) {
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auto& file = static_cast<const FileBackedFileSystem&>(fs).file();
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if (file.is_loop_device()) {
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auto& device = static_cast<LoopDevice const&>(file);
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auto path = TRY(device.custody().try_serialize_absolute_path());
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TRY(fs_object.add("source"sv, path->view()));
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} else {
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auto pseudo_path = TRY(static_cast<const FileBackedFileSystem&>(fs).file_description().pseudo_path());
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TRY(fs_object.add("source"sv, pseudo_path->view()));
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}
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} else {
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TRY(fs_object.add("source"sv, "none"));
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}
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TRY(fs_object.finish());
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return {};
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}));
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TRY(array.finish());
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return {};
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}
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}
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