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79e22acb22
Instead of generating ByteBuffers and keeping those lying around, have these filesystems generate KBuffers instead. These are way less spooky to leave around for a while. Since FileDescription will keep a generated file buffer around until userspace has read the whole thing, this prevents trivially exhausting the kmalloc heap by opening many files in /proc for example. The code responsible for generating each /proc file is not perfectly efficient and many of them still use ByteBuffers internally but they at least go away when we return now. :^)
127 lines
3.4 KiB
C++
127 lines
3.4 KiB
C++
#pragma once
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#include <AK/Badge.h>
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#include <AK/ByteBuffer.h>
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#include <AK/CircularQueue.h>
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#include <AK/RefCounted.h>
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#include <Kernel/FileSystem/FIFO.h>
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#include <Kernel/FileSystem/Inode.h>
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#include <Kernel/FileSystem/InodeMetadata.h>
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#include <Kernel/FileSystem/VirtualFileSystem.h>
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#include <Kernel/KBuffer.h>
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#include <Kernel/Net/Socket.h>
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#include <Kernel/VM/VirtualAddress.h>
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class File;
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class TTY;
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class MasterPTY;
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class Process;
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class Region;
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class CharacterDevice;
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class SharedMemory;
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class FileDescription : public RefCounted<FileDescription> {
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public:
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static NonnullRefPtr<FileDescription> create(RefPtr<Custody>&&);
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static NonnullRefPtr<FileDescription> create(RefPtr<File>, SocketRole = SocketRole::None);
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~FileDescription();
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NonnullRefPtr<FileDescription> clone();
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int close();
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off_t seek(off_t, int whence);
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ssize_t read(u8*, ssize_t);
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ssize_t write(const u8* data, ssize_t);
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KResult fstat(stat&);
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KResult fchmod(mode_t);
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bool can_read() const;
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bool can_write() const;
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ssize_t get_dir_entries(u8* buffer, ssize_t);
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ByteBuffer read_entire_file();
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String absolute_path() const;
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bool is_directory() const;
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File& file() { return *m_file; }
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const File& file() const { return *m_file; }
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bool is_device() const;
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bool is_tty() const;
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const TTY* tty() const;
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TTY* tty();
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bool is_master_pty() const;
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const MasterPTY* master_pty() const;
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MasterPTY* master_pty();
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InodeMetadata metadata() const;
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Inode* inode() { return m_inode.ptr(); }
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const Inode* inode() const { return m_inode.ptr(); }
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Custody* custody() { return m_custody.ptr(); }
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const Custody* custody() const { return m_custody.ptr(); }
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KResultOr<Region*> mmap(Process&, VirtualAddress, size_t offset, size_t, int prot);
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bool is_blocking() const { return m_is_blocking; }
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void set_blocking(bool b) { m_is_blocking = b; }
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bool should_append() const { return m_should_append; }
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void set_should_append(bool s) { m_should_append = s; }
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u32 file_flags() const { return m_file_flags; }
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void set_file_flags(u32);
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bool is_socket() const;
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Socket* socket();
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const Socket* socket() const;
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bool is_fifo() const;
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FIFO* fifo();
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FIFO::Direction fifo_direction() { return m_fifo_direction; }
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void set_fifo_direction(Badge<FIFO>, FIFO::Direction direction) { m_fifo_direction = direction; }
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bool is_shared_memory() const;
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SharedMemory* shared_memory();
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const SharedMemory* shared_memory() const;
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Optional<KBuffer>& generator_cache() { return m_generator_cache; }
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void set_original_inode(Badge<VFS>, NonnullRefPtr<Inode>&& inode) { m_inode = move(inode); }
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SocketRole socket_role() const { return m_socket_role; }
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void set_socket_role(SocketRole);
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KResult truncate(off_t);
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off_t offset() const { return m_current_offset; }
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KResult chown(uid_t, gid_t);
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private:
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friend class VFS;
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FileDescription(RefPtr<File>&&, SocketRole = SocketRole::None);
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FileDescription(FIFO&, FIFO::Direction);
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RefPtr<Custody> m_custody;
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RefPtr<Inode> m_inode;
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RefPtr<File> m_file;
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off_t m_current_offset { 0 };
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Optional<KBuffer> m_generator_cache;
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u32 m_file_flags { 0 };
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bool m_is_blocking { true };
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bool m_should_append { false };
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SocketRole m_socket_role { SocketRole::None };
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FIFO::Direction m_fifo_direction { FIFO::Direction::Neither };
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};
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