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#include <AK/Assertions.h>
#include <AK/HashMap.h>
#include <LibC/errno_numbers.h>
#include "FileSystem.h"
#include "MemoryManager.h"
static dword s_lastFileSystemID;
static HashMap<dword, FS*>* s_fs_map;
static HashTable<Inode*>* s_inode_set;
static HashMap<dword, FS*>& all_fses()
{
if (!s_fs_map)
s_fs_map = new HashMap<dword, FS*>();
return *s_fs_map;
}
HashTable<Inode*>& all_inodes()
{
if (!s_inode_set)
s_inode_set = new HashTable<Inode*>();
return *s_inode_set;
}
void FS::initialize_globals()
{
s_lastFileSystemID = 0;
s_fs_map = nullptr;
s_inode_set = nullptr;
}
FS::FS()
: m_fsid(++s_lastFileSystemID)
{
all_fses().set(m_fsid, this);
}
FS::~FS()
{
all_fses().remove(m_fsid);
}
FS* FS::from_fsid(dword id)
{
auto it = all_fses().find(id);
if (it != all_fses().end())
return (*it).value;
return nullptr;
}
ByteBuffer Inode::read_entire(FileDescriptor* descriptor)
{
size_t initial_size = metadata().size ? metadata().size : 4096;
auto contents = ByteBuffer::create_uninitialized(initial_size);
ssize_t nread;
byte buffer[4096];
byte* out = contents.pointer();
off_t offset = 0;
for (;;) {
nread = read_bytes(offset, sizeof(buffer), buffer, descriptor);
ASSERT(nread <= (ssize_t)sizeof(buffer));
if (nread <= 0)
break;
memcpy(out, buffer, nread);
out += nread;
offset += nread;
ASSERT(offset <= (ssize_t)initial_size); // FIXME: Support dynamically growing the buffer.
}
if (nread < 0) {
kprintf("Inode::read_entire: ERROR: %d\n", nread);
return nullptr;
}
contents.trim(offset);
return contents;
}
FS::DirectoryEntry::DirectoryEntry(const char* n, InodeIdentifier i, byte ft)
: name_length(strlen(n))
, inode(i)
, fileType(ft)
{
memcpy(name, n, name_length);
name[name_length] = '\0';
}
FS::DirectoryEntry::DirectoryEntry(const char* n, size_t nl, InodeIdentifier i, byte ft)
: name_length(nl)
, inode(i)
, fileType(ft)
{
memcpy(name, n, nl);
name[nl] = '\0';
}
Inode::Inode(FS& fs, unsigned index)
: m_fs(fs)
, m_index(index)
{
all_inodes().set(this);
}
Inode::~Inode()
{
all_inodes().remove(this);
}
void Inode::will_be_destroyed()
{
if (m_metadata_dirty)
flush_metadata();
}
int Inode::set_atime(time_t)
{
return -ENOTIMPL;
}
int Inode::set_ctime(time_t)
{
return -ENOTIMPL;
}
int Inode::set_mtime(time_t)
{
return -ENOTIMPL;
}
int Inode::increment_link_count()
{
return -ENOTIMPL;
}
int Inode::decrement_link_count()
{
return -ENOTIMPL;
}
void FS::sync()
{
for (auto* inode : all_inodes()) {
if (inode->is_metadata_dirty())
inode->flush_metadata();
}
}
void Inode::set_vmo(RetainPtr<VMObject>&& vmo)
{
m_vmo = move(vmo);
}
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