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b9be6b7bb4
Also added some assertions to DirectoryEntry in case someone tries to instantiate them with names that would overflow the name buffer. DirectoryEntry is a crappy data structure, and the name buffer is also crappy. Added a FIXME about replacing it with something nicer. Before this patch, the DirectoryEntry::name buffer would overflow if you did "touch extremely-long-file-name". Duh. Fixes #538.
108 lines
2.8 KiB
C++
108 lines
2.8 KiB
C++
#pragma once
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#include "InodeIdentifier.h"
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#include "InodeMetadata.h"
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#include "UnixTypes.h"
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#include <AK/String.h>
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#include <AK/ByteBuffer.h>
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#include <AK/Function.h>
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#include <AK/HashMap.h>
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#include <AK/OwnPtr.h>
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#include <AK/RefCounted.h>
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#include <AK/RefPtr.h>
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#include <AK/WeakPtr.h>
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#include <AK/kstdio.h>
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#include <Kernel/Devices/DiskDevice.h>
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#include <Kernel/KResult.h>
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#include <Kernel/Lock.h>
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static const u32 mepoch = 476763780;
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class Inode;
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class FileDescription;
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class LocalSocket;
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class VMObject;
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class FS : public RefCounted<FS> {
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friend class Inode;
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public:
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virtual ~FS();
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unsigned fsid() const { return m_fsid; }
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static FS* from_fsid(u32);
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static void sync();
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static void lock_all();
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virtual bool initialize() = 0;
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virtual const char* class_name() const = 0;
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virtual InodeIdentifier root_inode() const = 0;
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bool is_readonly() const { return m_readonly; }
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virtual unsigned total_block_count() const { return 0; }
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virtual unsigned free_block_count() const { return 0; }
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virtual unsigned total_inode_count() const { return 0; }
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virtual unsigned free_inode_count() const { return 0; }
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virtual KResult prepare_to_unmount() const { return KSuccess; }
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// FIXME: This data structure is very clunky and unpleasant. Replace it with something nicer.
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struct DirectoryEntry {
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DirectoryEntry(const char* name, InodeIdentifier, u8 file_type);
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DirectoryEntry(const char* name, int name_length, InodeIdentifier, u8 file_type);
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char name[256];
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int name_length { 0 };
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InodeIdentifier inode;
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u8 file_type { 0 };
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};
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virtual RefPtr<Inode> create_inode(InodeIdentifier parentInode, const String& name, mode_t, off_t size, dev_t, int& error) = 0;
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virtual RefPtr<Inode> create_directory(InodeIdentifier parentInode, const String& name, mode_t, int& error) = 0;
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virtual RefPtr<Inode> get_inode(InodeIdentifier) const = 0;
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virtual void flush_writes() {}
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int block_size() const { return m_block_size; }
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virtual bool is_disk_backed() const { return false; }
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protected:
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FS();
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void set_block_size(int);
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mutable Lock m_lock { "FS" };
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private:
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unsigned m_fsid { 0 };
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int m_block_size { 0 };
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bool m_readonly { false };
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};
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inline FS* InodeIdentifier::fs()
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{
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return FS::from_fsid(m_fsid);
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}
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inline const FS* InodeIdentifier::fs() const
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{
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return FS::from_fsid(m_fsid);
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}
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inline bool InodeIdentifier::is_root_inode() const
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{
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return (*this) == fs()->root_inode();
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}
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namespace AK {
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template<>
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struct Traits<InodeIdentifier> : public GenericTraits<InodeIdentifier> {
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static unsigned hash(const InodeIdentifier& inode) { return pair_int_hash(inode.fsid(), inode.index()); }
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static void dump(const InodeIdentifier& inode) { kprintf("%02u:%08u", inode.fsid(), inode.index()); }
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};
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}
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