mirror of
https://github.com/SerenityOS/serenity
synced 2026-05-11 01:22:12 +02:00
6a4ceb6bf2
Previously, you'd occasionally see this sort of construct (simplified):
```
return FooDevice::all_instances().with([&](auto& list) {
for (auto& device : list) {
if (/* search condition */)
continue;
return do_something_that_reacquires(device.index());
}
return ENOENT;
});
```
This would only work if the relevant `all_instances()` used a recursive
spinlock, since reacquiring the device would lock that again.
To get around this, a new helper has been added in `Device` through
which devices can be accessed whilst locking the device list, removing
the need to loop through the device type's `all_instances()`.
49 lines
1.7 KiB
C++
49 lines
1.7 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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#pragma once
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#include <AK/Types.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/Inode.h>
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namespace Kernel {
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class DevLoopFSInode final : public Inode {
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friend class DevLoopFS;
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public:
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virtual ~DevLoopFSInode() override;
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DevLoopFS& fs() { return static_cast<DevLoopFS&>(Inode::fs()); }
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DevLoopFS const& fs() const { return static_cast<DevLoopFS const&>(Inode::fs()); }
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private:
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DevLoopFSInode(DevLoopFS&, InodeIndex, LockWeakPtr<LoopDevice>);
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// NOTE: This constructor is used for the root inode only.
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DevLoopFSInode(DevLoopFS&);
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// ^Inode
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virtual ErrorOr<size_t> read_bytes_locked(off_t, size_t, UserOrKernelBuffer& buffer, OpenFileDescription*) const override;
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virtual InodeMetadata metadata() const override;
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virtual ErrorOr<void> traverse_as_directory(Function<ErrorOr<void>(FileSystem::DirectoryEntryView const&)>) const override;
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virtual ErrorOr<NonnullRefPtr<Inode>> lookup(StringView name) override;
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virtual ErrorOr<void> flush_metadata() override;
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virtual ErrorOr<size_t> write_bytes_locked(off_t, size_t, UserOrKernelBuffer const& buffer, OpenFileDescription*) override;
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virtual ErrorOr<NonnullRefPtr<Inode>> create_child(StringView name, mode_t, dev_t, UserID, GroupID) override;
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virtual ErrorOr<void> add_child(Inode&, StringView name, mode_t) override;
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virtual ErrorOr<void> remove_child(StringView name) override;
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virtual ErrorOr<void> chmod(mode_t) override;
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virtual ErrorOr<void> chown(UserID, GroupID) override;
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LockWeakPtr<LoopDevice> m_loop_device;
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InodeMetadata m_metadata;
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};
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}
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