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5292f6e78f
Currently only Ext2FS and TmpFS supports InodeWatchers. We now fail with ENOTSUPP if watch_file() is called on e.g ProcFS. This fixes an issue with FileManager chewing up all the CPU when /proc was opened. Watchers don't keep the watched Inode open, and when they close, the watcher FD will EOF. Since nothing else kept /proc open in FileManager, the watchers created for it would EOF immediately, causing a refresh over and over. Fixes #879.
82 lines
2.8 KiB
C++
82 lines
2.8 KiB
C++
#pragma once
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#include <AK/Optional.h>
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#include <Kernel/FileSystem/FileSystem.h>
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#include <Kernel/FileSystem/Inode.h>
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#include <Kernel/KBuffer.h>
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class TmpFSInode;
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class TmpFS final : public FS {
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friend class TmpFSInode;
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public:
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virtual ~TmpFS() override;
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static NonnullRefPtr<TmpFS> create();
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virtual bool initialize() override;
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virtual const char* class_name() const override { return "TmpFS"; }
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virtual bool supports_watchers() const override { return true; }
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virtual InodeIdentifier root_inode() const override;
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virtual RefPtr<Inode> get_inode(InodeIdentifier) const override;
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virtual RefPtr<Inode> create_inode(InodeIdentifier parent_id, const String& name, mode_t, off_t size, dev_t, int& error) override;
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virtual RefPtr<Inode> create_directory(InodeIdentifier parent_id, const String& name, mode_t, int& error) override;
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private:
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TmpFS();
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RefPtr<TmpFSInode> m_root_inode;
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HashMap<unsigned, NonnullRefPtr<TmpFSInode>> m_inodes;
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void register_inode(TmpFSInode&);
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void unregister_inode(InodeIdentifier);
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unsigned m_next_inode_index { 1 };
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unsigned next_inode_index();
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};
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class TmpFSInode final : public Inode {
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friend class TmpFS;
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public:
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virtual ~TmpFSInode() override;
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TmpFS& fs() { return static_cast<TmpFS&>(Inode::fs()); }
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const TmpFS& fs() const { return static_cast<const TmpFS&>(Inode::fs()); }
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// ^Inode
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virtual ssize_t read_bytes(off_t, ssize_t, u8* buffer, FileDescription*) const override;
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virtual InodeMetadata metadata() const override;
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virtual bool traverse_as_directory(Function<bool(const FS::DirectoryEntry&)>) const override;
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virtual InodeIdentifier lookup(StringView name) override;
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virtual void flush_metadata() override;
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virtual ssize_t write_bytes(off_t, ssize_t, const u8* buffer, FileDescription*) override;
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virtual KResult add_child(InodeIdentifier child_id, const StringView& name, mode_t) override;
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virtual KResult remove_child(const StringView& name) override;
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virtual size_t directory_entry_count() const override;
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virtual KResult chmod(mode_t) override;
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virtual KResult chown(uid_t, gid_t) override;
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virtual KResult truncate(off_t) override;
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virtual int set_atime(time_t) override;
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virtual int set_ctime(time_t) override;
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virtual int set_mtime(time_t) override;
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virtual void one_ref_left() override;
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private:
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TmpFSInode(TmpFS& fs, InodeMetadata metadata, InodeIdentifier parent);
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static NonnullRefPtr<TmpFSInode> create(TmpFS&, InodeMetadata metadata, InodeIdentifier parent);
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static NonnullRefPtr<TmpFSInode> create_root(TmpFS&);
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InodeMetadata m_metadata;
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InodeIdentifier m_parent;
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Optional<KBuffer> m_content;
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struct Child {
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FS::DirectoryEntry entry;
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NonnullRefPtr<TmpFSInode> inode;
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};
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HashMap<String, Child> m_children;
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};
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