FileSystem: Pass mode_t to Inode::add_child().

This way the Ext2FS code can update its directory entry "file type" fields
correctly based on the file mode. This fixes some e2fsck whining.

Kernel/FileSystem/Ext2FileSystem.cpp

@@ -12,6 +12,25 @@
 
 static const ssize_t max_inline_symlink_length = 60;
 
+static byte to_ext2_file_type(mode_t mode)
+{
+    if (is_regular_file(mode))
+        return EXT2_FT_REG_FILE;
+    if (is_directory(mode))
+        return EXT2_FT_DIR;
+    if (is_character_device(mode))
+        return EXT2_FT_CHRDEV;
+    if (is_block_device(mode))
+        return EXT2_FT_BLKDEV;
+    if (is_fifo(mode))
+        return EXT2_FT_FIFO;
+    if (is_socket(mode))
+        return EXT2_FT_SOCK;
+    if (is_symlink(mode))
+        return EXT2_FT_SYMLINK;
+    return EXT2_FT_UNKNOWN;
+}
+
 Retained<Ext2FS> Ext2FS::create(Retained<DiskDevice>&& device)
 {
     return adopt(*new Ext2FS(move(device)));
@@ -685,7 +704,7 @@ bool Ext2FSInode::traverse_as_directory(Function<bool(const FS::DirectoryEntry&)
     return true;
 }
 
-KResult Ext2FSInode::add_child(InodeIdentifier child_id, const String& name, byte file_type)
+KResult Ext2FSInode::add_child(InodeIdentifier child_id, const String& name, mode_t mode)
 {
     LOCKER(m_lock);
     ASSERT(is_directory());
@@ -713,7 +732,7 @@ KResult Ext2FSInode::add_child(InodeIdentifier child_id, const String& name, byt
     if (child_inode)
         child_inode->increment_link_count();
 
-    entries.append({ name.characters(), name.length(), child_id, file_type });
+    entries.append({ name.characters(), name.length(), child_id, to_ext2_file_type(mode) });
     bool success = fs().write_directory_inode(index(), move(entries));
     if (success)
         m_lookup_cache.set(name, child_id.index());
@@ -1130,24 +1149,8 @@ RetainPtr<Inode> Ext2FS::create_inode(InodeIdentifier parent_id, const String& n
         return { };
     }
 
-    byte file_type = 0;
-    if (is_regular_file(mode))
-        file_type = EXT2_FT_REG_FILE;
-    else if (is_directory(mode))
-        file_type = EXT2_FT_DIR;
-    else if (is_character_device(mode))
-        file_type = EXT2_FT_CHRDEV;
-    else if (is_block_device(mode))
-        file_type = EXT2_FT_BLKDEV;
-    else if (is_fifo(mode))
-        file_type = EXT2_FT_FIFO;
-    else if (is_socket(mode))
-        file_type = EXT2_FT_SOCK;
-    else if (is_symlink(mode))
-        file_type = EXT2_FT_SYMLINK;
-
     // Try adding it to the directory first, in case the name is already in use.
-    auto result = parent_inode->add_child({ fsid(), inode_id }, name, file_type);
+    auto result = parent_inode->add_child({ fsid(), inode_id }, name, to_ext2_file_type(mode));
     if (result.is_error()) {
         error = result;
         return { };

Kernel/FileSystem/Ext2FileSystem.h

@@ -32,7 +32,7 @@ private:
     virtual String reverse_lookup(InodeIdentifier) override;
     virtual void flush_metadata() override;
     virtual ssize_t write_bytes(off_t, ssize_t, const byte* data, FileDescriptor*) override;
-    virtual KResult add_child(InodeIdentifier child_id, const String& name, byte file_type) override;
+    virtual KResult add_child(InodeIdentifier child_id, const String& name, mode_t) override;
     virtual KResult remove_child(const String& name) override;
     virtual RetainPtr<Inode> parent() const override;
     virtual int set_atime(time_t) override;

Kernel/FileSystem/Inode.h

@@ -44,7 +44,7 @@ public:
     virtual InodeIdentifier lookup(const String& name) = 0;
     virtual String reverse_lookup(InodeIdentifier) = 0;
     virtual ssize_t write_bytes(off_t, ssize_t, const byte* data, FileDescriptor*) = 0;
-    virtual KResult add_child(InodeIdentifier child_id, const String& name, byte file_type) = 0;
+    virtual KResult add_child(InodeIdentifier child_id, const String& name, mode_t) = 0;
     virtual KResult remove_child(const String& name) = 0;
     virtual RetainPtr<Inode> parent() const = 0;
     virtual size_t directory_entry_count() const = 0;

Kernel/FileSystem/ProcFS.cpp

@@ -1079,11 +1079,10 @@ ssize_t ProcFSInode::write_bytes(off_t offset, ssize_t size, const byte* buffer,
     return 0;
 }
 
-KResult ProcFSInode::add_child(InodeIdentifier child_id, const String& name, byte file_type)
+KResult ProcFSInode::add_child(InodeIdentifier child_id, const String& name, mode_t)
 {
     (void)child_id;
     (void)name;
-    (void)file_type;
     return KResult(-EPERM);
 }
 

Kernel/FileSystem/ProcFS.h

@@ -87,7 +87,7 @@ private:
     virtual String reverse_lookup(InodeIdentifier) override;
     virtual void flush_metadata() override;
     virtual ssize_t write_bytes(off_t, ssize_t, const byte* buffer, FileDescriptor*) override;
-    virtual KResult add_child(InodeIdentifier child_id, const String& name, byte file_type) override;
+    virtual KResult add_child(InodeIdentifier child_id, const String& name, mode_t) override;
     virtual KResult remove_child(const String& name) override;
     virtual RetainPtr<Inode> parent() const override;
     virtual size_t directory_entry_count() const override;

Kernel/FileSystem/SyntheticFileSystem.cpp

@@ -279,11 +279,10 @@ ssize_t SynthFSInode::write_bytes(off_t offset, ssize_t size, const byte* buffer
     return 0;
 }
 
-KResult SynthFSInode::add_child(InodeIdentifier child_id, const String& name, byte file_type)
+KResult SynthFSInode::add_child(InodeIdentifier child_id, const String& name, mode_t)
 {
     (void)child_id;
     (void)name;
-    (void)file_type;
     ASSERT_NOT_REACHED();
 }
 

Kernel/FileSystem/SyntheticFileSystem.h

@@ -64,7 +64,7 @@ private:
     virtual String reverse_lookup(InodeIdentifier) override;
     virtual void flush_metadata() override;
     virtual ssize_t write_bytes(off_t, ssize_t, const byte* buffer, FileDescriptor*) override;
-    virtual KResult add_child(InodeIdentifier child_id, const String& name, byte file_type) override;
+    virtual KResult add_child(InodeIdentifier child_id, const String& name, mode_t) override;
     virtual KResult remove_child(const String& name) override;
     virtual RetainPtr<Inode> parent() const override;
     virtual size_t directory_entry_count() const override;

Kernel/FileSystem/VirtualFileSystem.cpp

@@ -390,7 +390,7 @@ KResult VFS::rename(StringView old_path, StringView new_path, Custody& base)
         new_custody.did_delete({});
     }
 
-    auto result = new_parent_inode.add_child(old_inode.identifier(), new_basename, 0 /* FIXME: file type? */);
+    auto result = new_parent_inode.add_child(old_inode.identifier(), new_basename, old_inode.mode());
     if (result.is_error())
         return result;
 
@@ -461,7 +461,7 @@ KResult VFS::link(StringView old_path, StringView new_path, Custody& base)
     if (!parent_inode.metadata().may_write(current->process()))
         return KResult(-EACCES);
 
-    return parent_inode.add_child(old_inode.identifier(), FileSystemPath(new_path).basename(), 0);
+    return parent_inode.add_child(old_inode.identifier(), FileSystemPath(new_path).basename(), old_inode.mode());
 }
 
 KResult VFS::unlink(StringView path, Custody& base)