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Lots of hacking to make a very simple "ls" utility.

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I added a dead-simple malloc that only allows allocations < 4096 bytes.
It just forwards the request to mmap() every time.

I also added simplified versions of opendir() and readdir().
This commit is contained in:
Andreas Kling 2018-10-24 12:43:52 +02:00
parent 0c5bbac86e
commit bca4b71bfa
19 changed files with 277 additions and 67 deletions
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15
VirtualFileSystem/VirtualFileSystem.h
View file

@ -6,12 +6,14 @@
#include <AK/String.h>
#include <AK/Vector.h>
#include <AK/Lock.h>
#include <AK/Function.h>
#include "InodeIdentifier.h"
#include "InodeMetadata.h"
#include "Limits.h"
#include "FileSystem.h"
class CharacterDevice;
class FileHandle;
class FileSystem;
class VirtualFileSystem {
public:
@ -20,6 +22,7 @@ public:
struct Node {
InodeIdentifier inode;
const InodeMetadata& metadata() const;
bool inUse() const { return inode.isValid(); }
@ -32,11 +35,15 @@ public:
FileSystem* fileSystem() { return inode.fileSystem(); }
const FileSystem* fileSystem() const { return inode.fileSystem(); }
VirtualFileSystem* vfs() { return m_vfs; }
const VirtualFileSystem* vfs() const { return m_vfs; }
private:
friend class VirtualFileSystem;
VirtualFileSystem* vfs { nullptr };
VirtualFileSystem* m_vfs { nullptr };
unsigned retainCount { 0 };
CharacterDevice* m_characterDevice { nullptr };
mutable InodeMetadata m_cachedMetadata;
};
static VirtualFileSystem& the();
@ -68,7 +75,9 @@ public:
void registerCharacterDevice(unsigned major, unsigned minor, CharacterDevice&);
private:
template<typename F> void enumerateDirectoryInode(InodeIdentifier, F func);
friend class FileHandle;
void enumerateDirectoryInode(InodeIdentifier, Function<bool(const FileSystem::DirectoryEntry&)>);
InodeIdentifier resolvePath(const String& path);
InodeIdentifier resolveSymbolicLink(const String& basePath, InodeIdentifier symlinkInode);