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Kernel: Steer away from heap allocations for ProcFS process data

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Instead, use more static patterns to acquire that sort of data.
This commit is contained in:
Liav A 2021-08-10 20:51:28 +03:00 • committed by Andreas Kling
parent bf1adc2d5d
commit 7ba991dc37
11 changed files with 991 additions and 879 deletions
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139
Kernel/FileSystem/ProcFS.h
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@ -14,12 +14,17 @@
#include <Kernel/KBufferBuilder.h>
#include <Kernel/Locking/Mutex.h>
#include <Kernel/ProcessExposed.h>
#include <Kernel/UnixTypes.h>
namespace Kernel {
class ProcFS final : public FileSystem {
friend class ProcFSInode;
friend class ProcFSDirectoryInode;
friend class ProcFSProcessDirectoryInode;
friend class ProcFSGlobalInode;
friend class ProcFSAssociatedProcessInode;
friend class ProcFSProcessSubDirectoryInode;
public:
virtual ~ProcFS() override;
@ -40,33 +45,50 @@ class ProcFSInode : public Inode {
friend class ProcFS;
public:
static NonnullRefPtr<ProcFSInode> create(const ProcFS&, const ProcFSExposedComponent&);
virtual ~ProcFSInode() override;
protected:
ProcFSInode(const ProcFS&, InodeIndex);
ProcFS& procfs() { return static_cast<ProcFS&>(Inode::fs()); }
ProcFS const& procfs() const { return static_cast<ProcFS const&>(Inode::fs()); }
// ^Inode
virtual KResult attach(FileDescription& description) = 0;
virtual void did_seek(FileDescription&, off_t) = 0;
virtual void flush_metadata() override final;
virtual KResultOr<NonnullRefPtr<Inode>> create_child(StringView name, mode_t, dev_t, uid_t, gid_t) override final;
virtual KResult add_child(Inode&, const StringView& name, mode_t) override final;
virtual KResult remove_child(const StringView& name) override final;
virtual KResult chmod(mode_t) override final;
virtual KResult chown(uid_t, gid_t) override final;
virtual KResult truncate(u64) override final;
};
class ProcFSGlobalInode : public ProcFSInode {
friend class ProcFS;
public:
static NonnullRefPtr<ProcFSGlobalInode> create(const ProcFS&, const ProcFSExposedComponent&);
virtual ~ProcFSGlobalInode() override {};
StringView name() const;
protected:
ProcFSInode(const ProcFS&, const ProcFSExposedComponent&);
ProcFSGlobalInode(const ProcFS&, const ProcFSExposedComponent&);
// ^Inode
virtual KResult attach(FileDescription& description) override;
virtual KResultOr<size_t> read_bytes(off_t, size_t, UserOrKernelBuffer& buffer, FileDescription*) const override;
virtual KResult traverse_as_directory(Function<bool(FileSystem::DirectoryEntryView const&)>) const override;
virtual RefPtr<Inode> lookup(StringView name) override;
virtual void flush_metadata() override;
virtual KResult attach(FileDescription& description) override final;
virtual KResultOr<size_t> read_bytes(off_t, size_t, UserOrKernelBuffer& buffer, FileDescription*) const override final;
virtual KResultOr<size_t> write_bytes(off_t, size_t, const UserOrKernelBuffer& buffer, FileDescription*) override final;
virtual void did_seek(FileDescription&, off_t) override final;
virtual InodeMetadata metadata() const override;
virtual KResultOr<size_t> write_bytes(off_t, size_t, const UserOrKernelBuffer& buffer, FileDescription*) override;
virtual KResultOr<NonnullRefPtr<Inode>> create_child(StringView name, mode_t, dev_t, uid_t, gid_t) override;
virtual KResult add_child(Inode&, const StringView& name, mode_t) override;
virtual KResult remove_child(const StringView& name) override;
virtual void did_seek(FileDescription&, off_t) override;
virtual KResult chmod(mode_t) override;
virtual KResult chown(uid_t, gid_t) override;
virtual KResult truncate(u64) override;
virtual KResult traverse_as_directory(Function<bool(FileSystem::DirectoryEntryView const&)>) const override;
virtual RefPtr<Inode> lookup(StringView) override;
NonnullRefPtr<ProcFSExposedComponent> m_associated_component;
};
class ProcFSLinkInode : public ProcFSInode {
class ProcFSLinkInode : public ProcFSGlobalInode {
friend class ProcFS;
public:
@ -77,16 +99,13 @@ protected:
virtual InodeMetadata metadata() const override;
};
class ProcFSDirectoryInode : public ProcFSInode {
class ProcFSDirectoryInode final : public ProcFSGlobalInode {
friend class ProcFS;
public:
static NonnullRefPtr<ProcFSDirectoryInode> create(const ProcFS&, const ProcFSExposedComponent&);
virtual ~ProcFSDirectoryInode() override;
ProcFS& fs() { return static_cast<ProcFS&>(Inode::fs()); }
ProcFS const& fs() const { return static_cast<ProcFS const&>(Inode::fs()); }
protected:
ProcFSDirectoryInode(const ProcFS&, const ProcFSExposedComponent&);
// ^Inode
@ -95,4 +114,84 @@ protected:
virtual RefPtr<Inode> lookup(StringView name) override;
};
class ProcFSProcessAssociatedInode : public ProcFSInode {
friend class ProcFS;
protected:
ProcFSProcessAssociatedInode(const ProcFS&, ProcessID, InodeIndex);
ProcessID associated_pid() const { return m_pid; }
// ^Inode
virtual KResultOr<size_t> write_bytes(off_t, size_t, const UserOrKernelBuffer& buffer, FileDescription*) override final;
private:
const ProcessID m_pid;
};
class ProcFSProcessDirectoryInode final : public ProcFSProcessAssociatedInode {
friend class ProcFS;
public:
static NonnullRefPtr<ProcFSProcessDirectoryInode> create(const ProcFS&, ProcessID);
private:
ProcFSProcessDirectoryInode(const ProcFS&, ProcessID);
// ^Inode
virtual KResult attach(FileDescription& description) override;
virtual void did_seek(FileDescription&, off_t) override { }
virtual InodeMetadata metadata() const override;
virtual KResult traverse_as_directory(Function<bool(FileSystem::DirectoryEntryView const&)>) const override;
virtual KResultOr<size_t> read_bytes(off_t, size_t, UserOrKernelBuffer& buffer, FileDescription*) const override final;
virtual RefPtr<Inode> lookup(StringView name) override;
};
class ProcFSProcessSubDirectoryInode final : public ProcFSProcessAssociatedInode {
friend class ProcFS;
public:
static NonnullRefPtr<ProcFSProcessSubDirectoryInode> create(const ProcFS&, SegmentedProcFSIndex::ProcessSubDirectory, ProcessID);
private:
ProcFSProcessSubDirectoryInode(const ProcFS&, SegmentedProcFSIndex::ProcessSubDirectory, ProcessID);
// ^Inode
virtual KResult attach(FileDescription& description) override;
virtual void did_seek(FileDescription&, off_t) override;
virtual InodeMetadata metadata() const override;
virtual KResult traverse_as_directory(Function<bool(FileSystem::DirectoryEntryView const&)>) const override;
virtual KResultOr<size_t> read_bytes(off_t, size_t, UserOrKernelBuffer& buffer, FileDescription*) const override final;
virtual RefPtr<Inode> lookup(StringView name) override;
const SegmentedProcFSIndex::ProcessSubDirectory m_sub_directory_type;
};
class ProcFSProcessPropertyInode final : public ProcFSProcessAssociatedInode {
friend class ProcFS;
public:
static NonnullRefPtr<ProcFSProcessPropertyInode> create_for_file_description_link(const ProcFS&, unsigned, ProcessID);
static NonnullRefPtr<ProcFSProcessPropertyInode> create_for_thread_stack(const ProcFS&, ThreadID, ProcessID);
static NonnullRefPtr<ProcFSProcessPropertyInode> create_for_pid_property(const ProcFS&, SegmentedProcFSIndex::MainProcessProperty, ProcessID);
private:
ProcFSProcessPropertyInode(const ProcFS&, SegmentedProcFSIndex::MainProcessProperty, ProcessID);
ProcFSProcessPropertyInode(const ProcFS&, ThreadID, ProcessID);
ProcFSProcessPropertyInode(const ProcFS&, unsigned, ProcessID);
// ^Inode
virtual KResult attach(FileDescription& description) override;
virtual void did_seek(FileDescription&, off_t) override;
virtual InodeMetadata metadata() const override;
virtual KResult traverse_as_directory(Function<bool(FileSystem::DirectoryEntryView const&)>) const override;
virtual KResultOr<size_t> read_bytes(off_t, size_t, UserOrKernelBuffer& buffer, FileDescription*) const override final;
virtual RefPtr<Inode> lookup(StringView name) override final;
KResult refresh_data(FileDescription& description);
KResult try_to_acquire_data(Process& process, KBufferBuilder& builder) const;
const SegmentedProcFSIndex::ProcessSubDirectory m_parent_sub_directory_type;
union {
SegmentedProcFSIndex::MainProcessProperty property_type;
unsigned property_index;
} m_possible_data;
mutable Mutex m_refresh_lock;
};
}