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FS: Don't default to having a full InodeMetadata in every Inode.

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This allows Ext2FS to keep its own ext2_inode around instead.
This commit is contained in:
Andreas Kling 2019-01-01 03:16:36 +01:00
parent 0cb074dc73
commit d07b08a287
Notes: sideshowbarker 2024-07-19 16:06:16 +09:00
8 changed files with 93 additions and 80 deletions
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91
VirtualFileSystem/Ext2FileSystem.cpp
View file

@ -221,41 +221,33 @@ Ext2FSInode::~Ext2FSInode()
{
}
void Ext2FSInode::populate_metadata() const
InodeMetadata Ext2FSInode::metadata() const
{
m_metadata.inode = identifier();
m_metadata.size = m_raw_inode.i_size;
m_metadata.mode = m_raw_inode.i_mode;
m_metadata.uid = m_raw_inode.i_uid;
m_metadata.gid = m_raw_inode.i_gid;
m_metadata.linkCount = m_raw_inode.i_links_count;
m_metadata.atime = m_raw_inode.i_atime;
m_metadata.ctime = m_raw_inode.i_ctime;
m_metadata.mtime = m_raw_inode.i_mtime;
m_metadata.dtime = m_raw_inode.i_dtime;
m_metadata.blockSize = fs().blockSize();
m_metadata.blockCount = m_raw_inode.i_blocks;
InodeMetadata metadata;
metadata.inode = identifier();
metadata.size = m_raw_inode.i_size;
metadata.mode = m_raw_inode.i_mode;
metadata.uid = m_raw_inode.i_uid;
metadata.gid = m_raw_inode.i_gid;
metadata.linkCount = m_raw_inode.i_links_count;
metadata.atime = m_raw_inode.i_atime;
metadata.ctime = m_raw_inode.i_ctime;
metadata.mtime = m_raw_inode.i_mtime;
metadata.dtime = m_raw_inode.i_dtime;
metadata.blockSize = fs().blockSize();
metadata.blockCount = m_raw_inode.i_blocks;
if (isBlockDevice(m_raw_inode.i_mode) || isCharacterDevice(m_raw_inode.i_mode)) {
unsigned dev = m_raw_inode.i_block[0];
m_metadata.majorDevice = (dev & 0xfff00) >> 8;
m_metadata.minorDevice= (dev & 0xff) | ((dev >> 12) & 0xfff00);
metadata.majorDevice = (dev & 0xfff00) >> 8;
metadata.minorDevice= (dev & 0xff) | ((dev >> 12) & 0xfff00);
}
return metadata;
}
void Ext2FSInode::flush_metadata()
{
dbgprintf("Ext2FSInode: flush_metadata for inode %u\n", index());
m_raw_inode.i_size = m_metadata.size;
m_raw_inode.i_mode = m_metadata.mode;
m_raw_inode.i_uid = m_metadata.uid;
m_raw_inode.i_gid = m_metadata.gid;
m_raw_inode.i_links_count = m_metadata.linkCount;
m_raw_inode.i_atime = m_metadata.atime;
m_raw_inode.i_ctime = m_metadata.ctime;
m_raw_inode.i_mtime = m_metadata.mtime;
m_raw_inode.i_dtime = m_metadata.dtime;
m_raw_inode.i_blocks = m_metadata.blockCount;
fs().write_ext2_inode(index(), m_raw_inode);
set_metadata_dirty(false);
}
@ -358,7 +350,7 @@ ssize_t Ext2FSInode::read_bytes(Unix::off_t offset, size_t count, byte* buffer,
bool Ext2FSInode::write(const ByteBuffer& data)
{
// FIXME: Support writing to symlink inodes.
ASSERT(!m_metadata.isSymbolicLink());
ASSERT(!is_symlink());
unsigned blocksNeededBefore = ceilDiv(size(), fs().blockSize());
unsigned blocksNeededAfter = ceilDiv((unsigned)data.size(), fs().blockSize());
@ -595,7 +587,6 @@ bool Ext2FS::write_ext2_inode(unsigned inode, const ext2_inode& e2inode)
auto& cached_inode = *(*it).value;
LOCKER(cached_inode.m_lock);
cached_inode.m_raw_inode = e2inode;
cached_inode.populate_metadata();
if (cached_inode.is_directory())
cached_inode.m_lookup_cache.clear();
}
@ -924,6 +915,7 @@ InodeIdentifier Ext2FS::find_parent_of_inode(InodeIdentifier inode_id) const
Vector<RetainPtr<Ext2FSInode>> directories_in_group;
for (unsigned i = 0; i < inodes_per_group(); ++i) {
// FIXME: Consult the inode bitmap to see which inodes to look into.
auto group_member = get_inode({ id(), firstInodeInGroup + i });
if (!group_member)
continue;
@ -990,3 +982,48 @@ void Ext2FSInode::one_retain_left()
{
// FIXME: I would like to not live forever, but uncached Ext2FS is fucking painful right now.
}
int Ext2FSInode::set_atime(Unix::time_t t)
{
if (fs().is_readonly())
return -EROFS;
m_raw_inode.i_atime = t;
set_metadata_dirty(true);
return 0;
}
int Ext2FSInode::set_ctime(Unix::time_t t)
{
if (fs().is_readonly())
return -EROFS;
m_raw_inode.i_ctime = t;
set_metadata_dirty(true);
return 0;
}
int Ext2FSInode::set_mtime(Unix::time_t t)
{
if (fs().is_readonly())
return -EROFS;
m_raw_inode.i_mtime = t;
set_metadata_dirty(true);
return 0;
}
int Ext2FSInode::increment_link_count()
{
if (fs().is_readonly())
return -EROFS;
++m_raw_inode.i_links_count;
set_metadata_dirty(true);
return 0;
}
int Ext2FSInode::decrement_link_count()
{
if (fs().is_readonly())
return -EROFS;
--m_raw_inode.i_links_count;
set_metadata_dirty(true);
return 0;
}

7
VirtualFileSystem/Ext2FileSystem.h
View file

@ -27,13 +27,18 @@ public:
private:
// ^Inode
virtual ssize_t read_bytes(Unix::off_t, size_t, byte* buffer, FileDescriptor*) override;
virtual void populate_metadata() const override;
virtual InodeMetadata metadata() const override;
virtual bool traverse_as_directory(Function<bool(const FS::DirectoryEntry&)>) override;
virtual InodeIdentifier lookup(const String& name) override;
virtual String reverse_lookup(InodeIdentifier) override;
virtual void flush_metadata() override;
virtual bool write(const ByteBuffer&) override;
virtual bool add_child(InodeIdentifier child_id, const String& name, byte file_type, int& error) override;
virtual int set_atime(Unix::time_t) override;
virtual int set_ctime(Unix::time_t) override;
virtual int set_mtime(Unix::time_t) override;
virtual int increment_link_count() override;
virtual int decrement_link_count() override;
void populate_lookup_cache();

43
VirtualFileSystem/FileSystem.cpp
View file

@ -111,56 +111,29 @@ void Inode::will_be_destroyed()
flush_metadata();
}
int Inode::set_atime(Unix::time_t ts)
int Inode::set_atime(Unix::time_t)
{
if (fs().is_readonly())
return -EROFS;
if (m_metadata.atime == ts)
return 0;
m_metadata.atime = ts;
m_metadata_dirty = true;
return 0;
return -ENOTIMPL;
}
int Inode::set_ctime(Unix::time_t ts)
int Inode::set_ctime(Unix::time_t)
{
if (fs().is_readonly())
return -EROFS;
if (m_metadata.ctime == ts)
return 0;
m_metadata.ctime = ts;
m_metadata_dirty = true;
return 0;
return -ENOTIMPL;
}
int Inode::set_mtime(Unix::time_t ts)
int Inode::set_mtime(Unix::time_t)
{
if (fs().is_readonly())
return -EROFS;
if (m_metadata.mtime == ts)
return 0;
m_metadata.mtime = ts;
m_metadata_dirty = true;
return 0;
return -ENOTIMPL;
}
int Inode::increment_link_count()
{
if (fs().is_readonly())
return -EROFS;
++m_metadata.linkCount;
m_metadata_dirty = true;
return 0;
return -ENOTIMPL;
}
int Inode::decrement_link_count()
{
if (fs().is_readonly())
return -EROFS;
ASSERT(m_metadata.linkCount);
--m_metadata.linkCount;
m_metadata_dirty = true;
return 0;
return -ENOTIMPL;
}
void FS::sync()

15
VirtualFileSystem/FileSystem.h
View file

@ -75,7 +75,7 @@ public:
bool is_directory() const { return metadata().isDirectory(); }
InodeIdentifier identifier() const { return { fsid(), index() }; }
const InodeMetadata& metadata() const { if (!m_metadata.isValid()) { populate_metadata(); } return m_metadata; }
virtual InodeMetadata metadata() const = 0;
ByteBuffer read_entire(FileDescriptor* = nullptr);
@ -88,11 +88,11 @@ public:
bool is_metadata_dirty() const { return m_metadata_dirty; }
int set_atime(Unix::time_t);
int set_ctime(Unix::time_t);
int set_mtime(Unix::time_t);
int increment_link_count();
int decrement_link_count();
virtual int set_atime(Unix::time_t);
virtual int set_ctime(Unix::time_t);
virtual int set_mtime(Unix::time_t);
virtual int increment_link_count();
virtual int decrement_link_count();
virtual void flush_metadata() = 0;
@ -101,10 +101,7 @@ public:
protected:
Inode(FS& fs, unsigned index);
virtual void populate_metadata() const = 0;
void set_metadata_dirty(bool b) { m_metadata_dirty = b; }
mutable InodeMetadata m_metadata;
private:
FS& m_fs;
unsigned m_index { 0 };

4
VirtualFileSystem/SyntheticFileSystem.cpp
View file

@ -184,9 +184,9 @@ SynthFSInode::~SynthFSInode()
{
}
void SynthFSInode::populate_metadata() const
InodeMetadata SynthFSInode::metadata() const
{
// Already done when SynthFS created the file.
return m_metadata;
}
ssize_t SynthFSInode::read_bytes(Unix::off_t offset, size_t count, byte* buffer, FileDescriptor* descriptor)

3
VirtualFileSystem/SyntheticFileSystem.h
View file

@ -47,7 +47,7 @@ public:
private:
// ^Inode
virtual ssize_t read_bytes(Unix::off_t, size_t, byte* buffer, FileDescriptor*) override;
virtual void populate_metadata() const override;
virtual InodeMetadata metadata() const override;
virtual bool traverse_as_directory(Function<bool(const FS::DirectoryEntry&)>) override;
virtual InodeIdentifier lookup(const String& name) override;
virtual String reverse_lookup(InodeIdentifier) override;
@ -64,4 +64,5 @@ private:
ByteBuffer m_data;
Function<ByteBuffer()> m_generator;
Vector<SynthFSInode*> m_children;
InodeMetadata m_metadata;
};

8
VirtualFileSystem/VirtualFileSystem.cpp
View file

@ -51,7 +51,7 @@ auto VFS::makeNode(InodeIdentifier inode) -> RetainPtr<Vnode>
if (!core_inode)
return nullptr;
auto& metadata = core_inode->metadata();
auto metadata = core_inode->metadata();
InterruptDisabler disabler;
@ -74,7 +74,6 @@ auto VFS::makeNode(InodeIdentifier inode) -> RetainPtr<Vnode>
vnode->inode = inode;
vnode->m_core_inode = move(core_inode);
vnode->m_cachedMetadata = metadata;
#ifdef VFS_DEBUG
kprintf("makeNode: inode=%u, size=%u, mode=%o, uid=%u, gid=%u\n", inode.index(), metadata.size, metadata.mode, metadata.uid, metadata.gid);
@ -474,11 +473,12 @@ void Vnode::release()
}
}
const InodeMetadata& Vnode::metadata() const
InodeMetadata Vnode::metadata() const
{
if (m_core_inode)
return m_core_inode->metadata();
return m_cachedMetadata;
ASSERT_NOT_REACHED();
return { };
}
VFS::Mount::Mount(InodeIdentifier host, RetainPtr<FS>&& guest_fs)

2
VirtualFileSystem/VirtualFileSystem.h
View file

@ -38,7 +38,7 @@ class VFS;
class Vnode {
public:
InodeIdentifier inode;
const InodeMetadata& metadata() const;
InodeMetadata metadata() const;
bool inUse() const { return inode.is_valid() || m_characterDevice; }