mirror of
https://github.com/SerenityOS/serenity
synced 2026-05-11 17:37:00 +02:00
0e94887b2c
Previously, the VFS layer would try to handle renames more-or-less by itself, which really only worked for ext2, and even that was only due to the replace_child kludge existing specifically for this purpose. This never worked properly for FATFS, since the VFS layer effectively depended on filesystems having some kind of reference-counting for inodes, which is something that simply doesn't exist on any FAT variant we support. To resolve various issues with the existing scheme, this commit makes filesystem implementations themselves responsible for the actual rename operation, while keeping all the existing validation inside the VFS layer. The only intended behavior change here is that rename operations should actually properly work on FATFS.
83 lines
2.5 KiB
C++
83 lines
2.5 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/Device.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(FileSystemSpecificOptions const&)
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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<void> DevLoopFS::rename(Inode&, StringView, Inode&, StringView)
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{
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return EROFS;
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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 = Device::acquire_by_type_and_major_minor_numbers(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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