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https://github.com/SerenityOS/serenity
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7f5a2c1466
Instead of putting everything in one hash map, let's distinguish between the devices based on their type. This change makes the devices semantically separated, and is considered a preparation before we could expose a comprehensive list of allocations per major numbers and their purpose.
78 lines
2.4 KiB
C++
78 lines
2.4 KiB
C++
/*
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* Copyright (c) 2024, 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 <Kernel/API/DeviceFileTypes.h>
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#include <Kernel/Devices/DeviceManagement.h>
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#include <Kernel/Devices/Loop/LoopDevice.h>
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#include <Kernel/FileSystem/DevLoopFS/FileSystem.h>
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#include <Kernel/FileSystem/DevLoopFS/Inode.h>
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#include <Kernel/FileSystem/RAMBackedFileType.h>
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#include <Kernel/Time/TimeManagement.h>
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namespace Kernel {
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ErrorOr<NonnullRefPtr<FileSystem>> DevLoopFS::try_create(ReadonlyBytes)
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{
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return TRY(adopt_nonnull_ref_or_enomem(new (nothrow) DevLoopFS));
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}
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DevLoopFS::DevLoopFS() = default;
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DevLoopFS::~DevLoopFS() = default;
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u8 DevLoopFS::internal_file_type_to_directory_entry_type(DirectoryEntryView const& entry) const
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{
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return ram_backed_file_type_to_directory_entry_type(entry);
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}
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ErrorOr<void> DevLoopFS::initialize()
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{
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m_root_inode = TRY(adopt_nonnull_ref_or_enomem(new (nothrow) DevLoopFSInode(*this)));
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m_root_inode->m_metadata.inode = { fsid(), 1 };
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m_root_inode->m_metadata.mode = S_IFDIR
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| S_IROTH | S_IRGRP | S_IRUSR
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| S_IXUSR | S_IXGRP | S_IXOTH;
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m_root_inode->m_metadata.uid = 0;
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m_root_inode->m_metadata.gid = 0;
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m_root_inode->m_metadata.size = 0;
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m_root_inode->m_metadata.mtime = TimeManagement::boot_time();
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return {};
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}
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static unsigned inode_index_to_loop_index(InodeIndex inode_index)
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{
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VERIFY(inode_index > 1);
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return inode_index.value() - 2;
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}
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Inode& DevLoopFS::root_inode()
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{
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return *m_root_inode;
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}
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ErrorOr<NonnullRefPtr<Inode>> DevLoopFS::get_inode(InodeIdentifier inode_id) const
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{
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if (inode_id.index() == 1)
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return *m_root_inode;
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unsigned loop_index = inode_index_to_loop_index(inode_id.index());
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auto device = DeviceManagement::the().get_device(DeviceNodeType::Block, 20, loop_index);
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VERIFY(device);
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auto& loop_device = static_cast<LoopDevice&>(*device);
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auto inode = TRY(adopt_nonnull_ref_or_enomem(new (nothrow) DevLoopFSInode(const_cast<DevLoopFS&>(*this), inode_id.index(), loop_device)));
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inode->m_metadata.inode = inode_id;
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inode->m_metadata.size = 0;
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inode->m_metadata.uid = 0;
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inode->m_metadata.gid = 0;
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inode->m_metadata.mode = S_IFBLK | S_IRUSR | S_IWUSR;
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inode->m_metadata.major_device = device->major();
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inode->m_metadata.minor_device = device->minor();
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inode->m_metadata.mtime = TimeManagement::boot_time();
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return inode;
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}
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}
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